Merge ff0b6a6a6a into ea279ef45a

fix typo

.github/workflows/build-windows.yml

@@ -128,8 +128,13 @@ jobs:
         cache: true
         update: true
 
-    - name: Clone MinGW packages repository
-      run: git clone https://github.com/msys2/MINGW-packages
+    - name: Clone MinGW packages repository and revert boost to 1.85.0
+      run: |
+        git clone https://github.com/msys2/MINGW-packages
+        cd MINGW-packages
+        git checkout 4cbb366edf2f268ac3146174b40ce38604646fc5 mingw-w64-boost
+        cd mingw-w64-boost
+        sed -i 's/boostorg.jfrog.io\/artifactory\/main/archives.boost.io/' PKGBUILD
 
     # headers
     - name: Get headers package version
@@ -205,26 +210,30 @@ jobs:
       run: |
         cd MINGW-packages/mingw-w64-openssl
         gpg --recv-keys D894E2CE8B3D79F5
+        gpg --recv-keys 216094DFD0CB81EF
         MINGW_ARCH=mingw32 makepkg-mingw -sCLf --noconfirm --nocheck
     - name: Install openssl package
       run: pacman --noconfirm -U MINGW-packages/mingw-w64-openssl/mingw-w64-i686-*-any.pkg.tar.zst
 
     # Boost
-    - name: Get boost package version
-      id:  version-boost
-      run: |
-        echo "version=$(pacman -Si mingw-w64-i686-boost | grep -Po '^Version\s*: \K.+')" >> $GITHUB_OUTPUT
+    #- name: Get boost package version
+    #  id:  version-boost
+    #  run: |
+    #    echo "version=$(pacman -Si mingw-w64-i686-boost | grep -Po '^Version\s*: \K.+')" >> $GITHUB_OUTPUT
     - name: Cache boost package
       uses: actions/cache@v4
       id: cache-boost
       with:
         path: MINGW-packages/mingw-w64-boost/*.zst
-        key: winxp-winpthreads-${{ steps.version-boost.outputs.version }}
+        key: winxp-boost-1.85.0+crt-${{ steps.version-headers.outputs.version }}+ossl-${{ steps.version-openssl.outputs.version }}
+    # Rebuild package if packages above has changed
     - name: Build WinXP-capable boost package
       if: steps.cache-boost.outputs.cache-hit != 'true'
       run: |
         cd MINGW-packages/mingw-w64-boost
         MINGW_ARCH=mingw32 makepkg-mingw -sCLf --noconfirm --nocheck
+    - name: Remove boost packages
+      run: pacman --noconfirm -R mingw-w64-i686-boost mingw-w64-i686-boost-libs
     - name: Install boost package
       run: pacman --noconfirm -U MINGW-packages/mingw-w64-boost/mingw-w64-i686-*-any.pkg.tar.zst
 

ChangeLog

@@ -1,6 +1,142 @@
 # for this file format description,
 # see https://github.com/olivierlacan/keep-a-changelog
 
+## [2.56.0] - 2025-02-10
+### Added
+- Config params for shared local destination
+- AddressBook full addresses cache
+- Decline transit tunnel to duplicated router
+- Recreate tunnels in random order
+### Changed
+- Exclude disk operations from SSU2 and NTCP2 threads
+- Set minimal version for peer test to 0.9.62
+- Send ack requested flag after second SSU2 resend attempt
+- Shorter ECIESx25519 ack request interval for datagram and I2CP sessions
+- Don't change datagram routing path too often if unidirectional data stream 
+- Reduce LeaseSet and local RouterInfo publishing confimation intervals
+- Don't delete buffer of connected routers or if an update received
+- Smaller RouterInfo request timeout if sent directly
+- Persist local RouterInfo in separate thread
+- Don't recalculate and process ranges for every SSU2 Ack block
+- Reseeds list
+### Fixed
+- Termination deadlock if SAM session is active
+- Race condition at tunnel endpoint
+- Inbound tunnel build encryption
+
+## [2.55.0] - 2024-12-30
+### Added
+- Support boost 1.87
+- "i2p.streaming.maxConcurrentStreams" tunnel's param to limit number of simultaneous streams
+- Separate thread for tunnel build requests
+- Show next peer and connectivity on "Transit tunnels" page
+- Tunnel name for local destination thread
+- Throttle incoming ECIESx25519 sessions
+- Send tunnel data to transport session directly if possible
+- Publish 'R' cap for yggdrasil-only routers, and 'U' cap for routers through proxy
+- Random tunnel rejection when medium congestion
+- Save unreachable router's endpoint to use it next time without introducers
+- Recognize symmetric NAT from peer test message 7
+- Resend HolePunch and RelayResponse messages
+### Changed
+- Removed own implementation of AESNI and always use one from openssl
+- Renamed main thread to i2pd-daemon
+- Set i2p.streaming.profile=2 for shared local destination
+- Reduced LeaseSet and RouterInfo lookup timeouts
+- Cleanup ECIES sessions and tags more often
+- Check LeaseSet expiration time
+- Handle NTCP2 session handshakes in separate thread
+- Limit last decline time by 1.5 hours in router's profile
+- Don't handle RelayRequest and RelayIntro with same nonce twice
+- Increased hole punch expiration interval
+- Send peer test message 6 with delay if message 4 was received before message 5
+- Pre-calculate more x25519 keys for transports in runtime
+- Don't request LeaseSet for incoming stream
+- Terminate incoming stream right away if no remote LeaseSet
+- Handle choked, new RTO and window size calculation and resetting algorithm for streams
+### Fixed
+- Empty string in addressbook subscriptions
+- ECIESx25519 sessions without destination
+- Missing RouterInfo buffer in NetDb
+- Invalid I2PControl certificate
+- Routers disappear from NetDb when offline
+- Peer test message 6 sent to unknown endpoint
+- Race condition with LeaseSet update
+- Excessive CPU usage by streams
+- Crash on shutdown
+
+## [2.54.0] - 2024-10-06
+### Added
+- Maintain recently connected routers list to avoid false-positive peer test
+- Limited connectivity mode(through proxy)
+- "i2p.streaming.profile" tunnel's param to let tunnel select also low-bandwidth routers
+- Limit stream's inbound speed
+- Periodic ack requests in ratchets session
+- Set congestion cap G immediately if through proxy
+- Show tunnel's routers bandwidth caps in web console
+- Handle immediate ack requested flag in SSU2 data packets
+- Resend and ack peer test and relay messages
+- "senduseragent" HTTP proxy's param to pass through user's User-Agent
+### Changed
+- Exclude 'N' routers from high-bandwidth routers for client tunnels
+- C++11 support has been dropped, the minimal requirement is C++17 now, C++20 for some compilers
+- Removed dependency from boost::date_time and boost::filesystem
+- Set default i2cp.leaseSetEncType to 0,4 and to 4 for server tunnels
+- Handle i2cp.inboundlimit and i2cp.outboundlimit params in I2CP
+- Publish LeaseSet with new timestamp update if tunnel was replaced in the same second
+- Increase max number of generated tags to 800 per tagset
+- Routing path expiration by time instead num attempts 
+- Save timestamp from epoch instead local time to profiles
+- Update introducer's iTag if session to introducer was replaced to new one
+- RTT, window size and number of NACKs calculation for streaming
+- Don't select same peer for tunnel too often
+- Use WinApi for data path UTF-8 conversion for Windows 
+### Fixed
+- Jump link crash if address book is disabled
+- Race condition if connect through an introducer
+- "Date" header in I2PControl response
+- Incomplete response from web console
+- AEAD verification with LibreSSL
+- Number of generated tags and new keys for follow-on tagsets
+- Expired leases in LeaseSet
+- Attempts to send HolePunch to 0.0.0.0
+- Incorrect options size in quick ack streaming packet
+- Low bandwidth router appeared as first peer in high-bandwidth client tunnel
+
+## [2.53.1] - 2024-07-29
+### Changed
+- I2CP performance improvement
+### Fixed
+- 100% CPU usage after I2CP/SAM/BOB session termination
+- Incorrect client limits returned through I2CP
+- Build with LibreSSL
+
+## [2.53.0] - 2024-07-19
+### Added
+- New congestion control algorithm for streaming
+- Support miniupnp-2.2.8
+- Limit stream's outbound speed
+- Flood to next day closest floodfills before UTC midnight
+- Recognize duplicated routers and bypass them
+- Random SSU2 resend interval
+### Changed
+- Set minimal version to 0.9.69 for floodfills and 0.9.58 for client tunnels
+- Removed openssl 1.0.2 support
+- Move unsent I2NP messages to the new session if replaced
+- Use mt19937 RNG instead rand()
+- Update router's congestion caps before initial publishing
+- Don't try introducer with invalid address
+- Select newest introducers to publish
+- Don't request relay tag for every session if we have enough introducers
+- Update timestamp for non-reachable or hidden router
+- Reset streaming routing path if duplicated SYN received
+- Update LeaseSet if inbound tunnel failed
+- Reseeds list
+### Fixed
+- Crash when a destination gets terminated
+- Expired offline signature upon destination creation
+- Race condition between local RouterInfo buffer creation and sending it through the transports
+
 ## [2.52.0] - 2024-05-12
 ### Added
 - Separate threads for persisting RouterInfos and profiles to disk

Makefile

@@ -29,7 +29,6 @@ DAEMON_SRC_DIR := daemon
 # import source files lists
 include filelist.mk
 
-USE_AESNI       := $(or $(USE_AESNI),yes)
 USE_STATIC      := $(or $(USE_STATIC),no)
 USE_UPNP        := $(or $(USE_UPNP),no)
 DEBUG           := $(or $(DEBUG),yes)

Makefile.bsd

@@ -1,18 +1,22 @@
 CXX = clang++
 CXXFLAGS ?= ${CXX_DEBUG} -Wall -Wextra -Wno-unused-parameter -pedantic -Wno-misleading-indentation
+DEFINES = -D_GLIBCXX_USE_NANOSLEEP=1
+INCFLAGS = -I/usr/include/ -I/usr/local/include/
+LDFLAGS = ${LD_DEBUG} -Wl,-rpath,/usr/local/lib -L/usr/local/lib
+LDLIBS = -lcrypto -lssl -lz -lpthread -lboost_system -lboost_program_options
+
 ## NOTE: NEEDED_CXXFLAGS is here so that custom CXXFLAGS can be specified at build time
 ## **without** overwriting the CXXFLAGS which we need in order to build.
 ## For example, when adding 'hardening flags' to the build
 ## (e.g. -fstack-protector-strong -Wformat -Werror=format-security), we do not want to remove
 ## -std=c++11. If you want to remove this variable please do so in a way that allows setting
 ## custom FLAGS to work at build-time.
-CXXVER := $(shell $(CXX) -dumpversion)
-ifeq (${CXXVER}, "4.2.1") # older clang always returned 4.2.1
-	NEEDED_CXXFLAGS = -std=c++11
-else # newer versions support C++17
+CXXVER := $(shell $(CXX) -dumpversion|cut -c 1-2)
+ifeq (${CXXVER}, "4.") # older clang always returned 4.2.1
+	$(error Compiler too old)
+else ifeq (${CXXVER}, ${filter ${CXXVER},16 17 18 19})  # clang 16 - 19
+	NEEDED_CXXFLAGS = -std=c++20
+else
 	NEEDED_CXXFLAGS = -std=c++17
 endif
-DEFINES = -D_GLIBCXX_USE_NANOSLEEP=1
-INCFLAGS = -I/usr/include/ -I/usr/local/include/
-LDFLAGS = ${LD_DEBUG} -Wl,-rpath,/usr/local/lib -L/usr/local/lib
-LDLIBS = -lcrypto -lssl -lz -lboost_system -lboost_date_time -lboost_filesystem -lboost_program_options -lpthread
+

Makefile.haiku

@@ -1,8 +1,8 @@
 CXX = g++
-CXXFLAGS := -Wall -std=c++11
+CXXFLAGS := -Wall -std=c++17
 INCFLAGS = -I/system/develop/headers
 DEFINES = -D_DEFAULT_SOURCE -D_GNU_SOURCE
-LDLIBS = -lbe -lbsd -lnetwork -lz -lcrypto -lssl -lboost_system -lboost_date_time -lboost_filesystem -lboost_program_options -lpthread
+LDLIBS = -lbe -lbsd -lnetwork -lz -lcrypto -lssl -lboost_system -lboost_program_options -lpthread
 
 ifeq ($(USE_UPNP),yes)
 	DEFINES += -DUSE_UPNP

Makefile.homebrew

@@ -5,20 +5,20 @@ SSLROOT = ${BREWROOT}/opt/openssl@1.1
 UPNPROOT = ${BREWROOT}/opt/miniupnpc
 
 CXXFLAGS ?= ${CXX_DEBUG} -Wall -Wno-overloaded-virtual
-NEEDED_CXXFLAGS ?= -std=c++11
+NEEDED_CXXFLAGS ?= -std=c++17
 INCFLAGS ?= -I${SSLROOT}/include -I${BOOSTROOT}/include
 LDFLAGS ?= ${LD_DEBUG}
 DEFINES += -DMAC_OSX
 
 ifeq ($(USE_STATIC),yes)
-	LDLIBS = -lz ${SSLROOT}/lib/libcrypto.a ${SSLROOT}/lib/libssl.a ${BOOSTROOT}/lib/libboost_system.a ${BOOSTROOT}/lib/libboost_date_time.a ${BOOSTROOT}/lib/libboost_filesystem.a ${BOOSTROOT}/lib/libboost_program_options.a
+	LDLIBS = -lz ${SSLROOT}/lib/libcrypto.a ${SSLROOT}/lib/libssl.a ${BOOSTROOT}/lib/libboost_system.a ${BOOSTROOT}/lib/libboost_filesystem.a ${BOOSTROOT}/lib/libboost_program_options.a
 ifeq ($(USE_UPNP),yes)
 	LDLIBS += ${UPNPROOT}/lib/libminiupnpc.a
 endif
 	LDLIBS +=  -lpthread -ldl
 else
 	LDFLAGS += -L${SSLROOT}/lib -L${BOOSTROOT}/lib
-	LDLIBS = -lz -lcrypto -lssl -lboost_system -lboost_date_time -lboost_filesystem -lboost_program_options -lpthread
+	LDLIBS = -lz -lcrypto -lssl -lboost_system -lboost_filesystem -lboost_program_options -lpthread
 ifeq ($(USE_UPNP),yes)
 	LDFLAGS += -L${UPNPROOT}/lib
 	LDLIBS += -lminiupnpc
@@ -30,13 +30,6 @@ ifeq ($(USE_UPNP),yes)
 	INCFLAGS += -I${UPNPROOT}/include
 endif
 
-ifeq ($(USE_AESNI),yes)
-ifneq (, $(findstring i386, $(SYS))$(findstring i686, $(SYS))$(findstring x86_64, $(SYS))) # only x86-based CPU supports that
-	NEEDED_CXXFLAGS += -maes
-	DEFINES += -D__AES__
-endif
-endif
-
 install: all
 	install -d ${PREFIX}/bin
 	install -m 755 ${I2PD} ${PREFIX}/bin

Makefile.linux

@@ -9,24 +9,17 @@ LDFLAGS ?= ${LD_DEBUG}
 ## -std=c++11. If you want to remove this variable please do so in a way that allows setting
 ## custom FDLAGS to work at build-time.
 
-# detect proper flag for c++11 support by compilers
+# detect proper flag for c++17 support by compilers
 CXXVER := $(shell $(CXX) -dumpversion)
 ifeq ($(shell expr match $(CXX) 'clang'),5)
-	NEEDED_CXXFLAGS += -std=c++11
-else ifeq ($(shell expr match ${CXXVER} "4\.[0-9][0-9]"),4) # gcc >= 4.10
-	NEEDED_CXXFLAGS += -std=c++11
-else ifeq ($(shell expr match ${CXXVER} "4\.[8-9]"),3) # gcc 4.8 - 4.9
-	NEEDED_CXXFLAGS += -std=c++11 -D_GLIBCXX_USE_NANOSLEEP=1
-else ifeq ($(shell expr match ${CXXVER} "[5-6]"),1) # gcc 5 - 6
-	NEEDED_CXXFLAGS += -std=c++11
-	LDLIBS = -latomic
-else ifeq ($(shell expr match ${CXXVER} "[7-9]"),1) # gcc 7 - 9
 	NEEDED_CXXFLAGS += -std=c++17
-	LDLIBS = -latomic
-else ifeq ($(shell expr match ${CXXVER} "1[0-9]"),2) # gcc 10+
-#	NEEDED_CXXFLAGS += -std=c++20
+else ifeq ($(shell expr match ${CXXVER} "[8-9]"),1) # gcc 8 - 9
 	NEEDED_CXXFLAGS += -std=c++17
-	LDLIBS = -latomic
+	LDLIBS = -lboost_system -lstdc++fs
+else ifeq ($(shell expr match ${CXXVER} "1[0-2]"),2) # gcc 10 - 12
+	NEEDED_CXXFLAGS += -std=c++17
+else ifeq ($(shell expr match ${CXXVER} "1[3-9]"),2) # gcc 13+
+	NEEDED_CXXFLAGS += -std=c++20
 else # not supported
 $(error Compiler too old)
 endif
@@ -38,9 +31,6 @@ ifeq ($(USE_STATIC),yes)
 #   Using 'getaddrinfo' in statically linked applications requires at runtime
 #   the shared libraries from the glibc version used for linking
 	LIBDIR := /usr/lib/$(SYS)
-	LDLIBS += $(LIBDIR)/libboost_system.a
-	LDLIBS += $(LIBDIR)/libboost_date_time.a
-	LDLIBS += $(LIBDIR)/libboost_filesystem.a
 	LDLIBS += $(LIBDIR)/libboost_program_options.a
 	LDLIBS += $(LIBDIR)/libssl.a
 	LDLIBS += $(LIBDIR)/libcrypto.a
@@ -50,7 +40,7 @@ ifeq ($(USE_UPNP),yes)
 endif
 	LDLIBS += -lpthread -ldl
 else
-	LDLIBS += -lcrypto -lssl -lz -lboost_system -lboost_date_time -lboost_filesystem -lboost_program_options -lpthread
+	LDLIBS += -lcrypto -lssl -lz -lboost_program_options -lpthread -latomic
 ifeq ($(USE_UPNP),yes)
 	LDLIBS += -lminiupnpc
 endif
@@ -61,13 +51,6 @@ ifeq ($(USE_UPNP),yes)
 	DEFINES += -DUSE_UPNP
 endif
 
-ifeq ($(USE_AESNI),yes)
-ifneq (, $(findstring i386, $(SYS))$(findstring i686, $(SYS))$(findstring x86_64, $(SYS))) # only x86-based CPU supports that
-	NEEDED_CXXFLAGS += -maes
-	DEFINES += -D__AES__
-endif
-endif
-
 install: all
 	install -d ${PREFIX}/bin
 	install -m 755 ${I2PD} ${PREFIX}/bin

Makefile.mingw

@@ -7,7 +7,7 @@ CXXFLAGS := $(CXX_DEBUG) -fPIC -msse
 INCFLAGS := -I$(DAEMON_SRC_DIR) -IWin32
 LDFLAGS := ${LD_DEBUG} -static -fPIC -msse
 
-NEEDED_CXXFLAGS += -std=c++17
+NEEDED_CXXFLAGS += -std=c++20
 DEFINES += -DWIN32_LEAN_AND_MEAN
 
 # UPNP Support
@@ -16,9 +16,11 @@ ifeq ($(USE_UPNP),yes)
 	LDLIBS = -lminiupnpc
 endif
 
+ifeq ($(USE_WINXP_FLAGS), yes)
+	DEFINES += -DWINVER=0x0501 -D_WIN32_WINNT=0x0501
+endif
+
 LDLIBS += \
-	$(MINGW_PREFIX)/lib/libboost_system-mt.a \
-	$(MINGW_PREFIX)/lib/libboost_date_time-mt.a \
 	$(MINGW_PREFIX)/lib/libboost_filesystem-mt.a \
 	$(MINGW_PREFIX)/lib/libboost_program_options-mt.a \
 	$(MINGW_PREFIX)/lib/libssl.a \
@@ -40,16 +42,6 @@ ifeq ($(USE_WIN32_APP), yes)
 	DAEMON_OBJS += $(patsubst %.rc,obj/%.o,$(DAEMON_RC))
 endif
 
-ifeq ($(USE_WINXP_FLAGS), yes)
-	DEFINES += -DWINVER=0x0501 -D_WIN32_WINNT=0x0501
-endif
-
-ifeq ($(USE_AESNI),yes)
-	NEEDED_CXXFLAGS += -maes
-	LDFLAGS += -maes
-	DEFINES += -D__AES__
-endif
-
 ifeq ($(USE_ASLR),yes)
 	LDFLAGS += -Wl,--nxcompat -Wl,--high-entropy-va -Wl,--dynamicbase,--export-all-symbols
 endif

Makefile.osx

@@ -1,5 +1,5 @@
 CXX = clang++
-CXXFLAGS := ${CXX_DEBUG} -Wall -std=c++11
+CXXFLAGS := ${CXX_DEBUG} -Wall -std=c++17
 INCFLAGS = -I/usr/local/include
 DEFINES := -DMAC_OSX
 LDFLAGS := -Wl,-rpath,/usr/local/lib -L/usr/local/lib
@@ -7,9 +7,9 @@ LDFLAGS += -Wl,-dead_strip
 LDFLAGS += -Wl,-dead_strip_dylibs
 
 ifeq ($(USE_STATIC),yes)
-	LDLIBS = -lz /usr/local/lib/libcrypto.a /usr/local/lib/libssl.a /usr/local/lib/libboost_system.a /usr/local/lib/libboost_date_time.a /usr/local/lib/libboost_filesystem.a /usr/local/lib/libboost_program_options.a -lpthread
+	LDLIBS = -lz /usr/local/lib/libcrypto.a /usr/local/lib/libssl.a /usr/local/lib/libboost_system.a /usr/local/lib/libboost_filesystem.a /usr/local/lib/libboost_program_options.a -lpthread
 else
-	LDLIBS = -lz -lcrypto -lssl -lboost_system -lboost_date_time -lboost_filesystem -lboost_program_options -lpthread
+	LDLIBS = -lz -lcrypto -lssl -lboost_system -lboost_filesystem -lboost_program_options -lpthread
 endif
 
 ifeq ($(USE_UPNP),yes)
@@ -25,9 +25,5 @@ endif
 OSARCH = $(shell uname -p)
 
 ifneq ($(OSARCH),powerpc)
-	ifeq ($(USE_AESNI),yes)
-		CXXFLAGS += -D__AES__ -maes
-	else
-		CXXFLAGS += -msse
-	endif
+	CXXFLAGS += -msse
 endif

Win32/Win32App.cpp

@@ -313,7 +313,7 @@ namespace win32
 					}
 					case ID_DATADIR:
 					{
-						std::string datadir(i2p::fs::GetUTF8DataDir());
+						std::string datadir(i2p::fs::GetDataDir());
 						ShellExecute(NULL, "explore", datadir.c_str(), NULL, NULL, SW_SHOWNORMAL);
 						return 0;
 					}
@@ -355,9 +355,7 @@ namespace win32
 						}
 					}
 				}
-#if (__cplusplus >= 201703L) // C++ 17 or higher
 				[[fallthrough]];
-#endif
 			}
 			case WM_TRAYICON:
 			{

Win32/Win32NetState.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2020, The PurpleI2P Project
+* Copyright (c) 2013-2024, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *

Win32/Win32NetState.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2020, The PurpleI2P Project
+* Copyright (c) 2013-2024, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *

build/CMakeLists.txt

@@ -29,7 +29,6 @@ project(
 )
 
 # configurable options
-option(WITH_AESNI           "Use AES-NI instructions set"             ON)
 option(WITH_HARDENING       "Use hardening compiler flags"            OFF)
 option(WITH_LIBRARY         "Build library"                           ON)
 option(WITH_BINARY          "Build binary"                            ON)
@@ -156,20 +155,6 @@ else()
   endif()
   set(CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL} -ffunction-sections -fdata-sections")
   set(CMAKE_EXE_LINKER_FLAGS_MINSIZEREL "-Wl,--gc-sections") # -flto is added from above
-
-  # check for c++17 & c++11 support
-  include(CheckCXXCompilerFlag)
-
-  CHECK_CXX_COMPILER_FLAG("-std=c++17" CXX17_SUPPORTED)
-  CHECK_CXX_COMPILER_FLAG("-std=c++11" CXX11_SUPPORTED)
-
-  if(CXX17_SUPPORTED)
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17")
-  elseif(CXX11_SUPPORTED)
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
-  else()
-    message(SEND_ERROR "C++17 nor C++11 standard not seems to be supported by compiler. Too old version?")
-  endif()
 endif()
 
 if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
@@ -199,16 +184,6 @@ if(UNIX)
   endif()
 endif()
 
-# Note: AES-NI and AVX is available on x86-based CPU's.
-# Here also ARM64 implementation, but currently we don't support it.
-# MSVC is not supported due to different ASM processing, so we hope OpenSSL has its own checks to run optimized code.
-if(WITH_AESNI AND (ARCHITECTURE MATCHES "x86_64" OR ARCHITECTURE MATCHES "i386"))
-  if(NOT MSVC)
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -maes")
-  endif()
-  add_definitions(-D__AES__)
-endif()
-
 if(WITH_ADDRSANITIZER)
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=address -fno-omit-frame-pointer")
   set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fsanitize=address")
@@ -223,6 +198,10 @@ if(WITH_THREADSANITIZER)
   endif()
 endif()
 
+if (CMAKE_COMPILER_IS_GNUCC AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 10.0 AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 8.0) # gcc 8-9
+    list(APPEND CMAKE_REQUIRED_LIBRARIES "stdc++fs")
+endif()
+
 # Use std::atomic instead of GCC builtins on macOS PowerPC:
 # For more information refer to: https://github.com/PurpleI2P/i2pd/issues/1726#issuecomment-1306335111
 # This has been fixed in Boost 1.81, nevertheless we retain the setting for the sake of compatibility.
@@ -277,14 +256,14 @@ else()
   if(NOT MSVC)
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC")
   endif()
-  add_definitions(-DBOOST_ATOMIC_DYN_LINK -DBOOST_SYSTEM_DYN_LINK -DBOOST_FILESYSTEM_DYN_LINK -DBOOST_PROGRAM_OPTIONS_DYN_LINK -DBOOST_DATE_TIME_DYN_LINK -DBOOST_REGEX_DYN_LINK)
+  add_definitions(-DBOOST_ATOMIC_DYN_LINK -DBOOST_SYSTEM_DYN_LINK -DBOOST_FILESYSTEM_DYN_LINK -DBOOST_PROGRAM_OPTIONS_DYN_LINK)
   if(WIN32)
     set(Boost_USE_STATIC_LIBS OFF)
     set(Boost_USE_STATIC_RUNTIME OFF)
   endif()
 endif()
 
-find_package(Boost REQUIRED COMPONENTS system filesystem program_options date_time OPTIONAL_COMPONENTS atomic)
+find_package(Boost REQUIRED COMPONENTS system filesystem program_options)
 if(NOT DEFINED Boost_FOUND)
   message(SEND_ERROR "Boost is not found, or your boost version was below 1.46. Please download Boost!")
 endif()
@@ -312,6 +291,26 @@ if(ZLIB_FOUND)
   link_directories(${ZLIB_ROOT}/lib)
 endif()
 
+# C++ standard to use, based on compiler and version of boost
+if(NOT MSVC)
+# check for c++20 & c++17 support
+  include(CheckCXXCompilerFlag)
+
+  if(Boost_VERSION VERSION_GREATER_EQUAL "1.83") # min boost version for c++20
+    CHECK_CXX_COMPILER_FLAG("-std=c++20" CXX20_SUPPORTED)
+  endif()
+  CHECK_CXX_COMPILER_FLAG("-std=c++17" CXX17_SUPPORTED)
+ 
+
+  if(CXX20_SUPPORTED)
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++20")
+  elseif(CXX17_SUPPORTED)
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17")
+  else()
+    message(SEND_ERROR "C++20 nor C++17 standard not seems to be supported by compiler. Too old version?")
+  endif()
+endif()
+
 # load includes
 include_directories(SYSTEM ${Boost_INCLUDE_DIRS} ${OPENSSL_INCLUDE_DIR} ${ZLIB_INCLUDE_DIR})
 
@@ -322,9 +321,9 @@ message(STATUS "Compiler vendor    : ${CMAKE_CXX_COMPILER_ID}")
 message(STATUS "Compiler version   : ${CMAKE_CXX_COMPILER_VERSION}")
 message(STATUS "Compiler path      : ${CMAKE_CXX_COMPILER}")
 message(STATUS "Architecture       : ${ARCHITECTURE}")
+message(STATUS "Compiler flags     : ${CMAKE_CXX_FLAGS}")
 message(STATUS "Install prefix:    : ${CMAKE_INSTALL_PREFIX}")
 message(STATUS "Options:")
-message(STATUS "  AESNI            : ${WITH_AESNI}")
 message(STATUS "  HARDENING        : ${WITH_HARDENING}")
 message(STATUS "  LIBRARY          : ${WITH_LIBRARY}")
 message(STATUS "  BINARY           : ${WITH_BINARY}")

build/cmake_modules/CheckAtomic.cmake

@@ -8,7 +8,7 @@ INCLUDE(CheckLibraryExists)
 
 function(check_working_cxx_atomics varname)
   set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
-  set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -std=c++11")
+  set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -std=c++17")
   CHECK_CXX_SOURCE_COMPILES("
 #include <atomic>
 std::atomic<int> x;
@@ -25,7 +25,7 @@ endfunction(check_working_cxx_atomics)
 
 function(check_working_cxx_atomics64 varname)
   set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
-  set(CMAKE_REQUIRED_FLAGS "-std=c++11 ${CMAKE_REQUIRED_FLAGS}")
+  set(CMAKE_REQUIRED_FLAGS "-std=c++17 ${CMAKE_REQUIRED_FLAGS}")
   CHECK_CXX_SOURCE_COMPILES("
 #include <atomic>
 #include <cstdint>

build/cmake_modules/GetGitRevisionDescription.cmake

@@ -59,7 +59,7 @@ get_filename_component(_gitdescmoddir ${CMAKE_CURRENT_LIST_FILE} PATH)
 # function returns an empty string via _git_dir_var.
 #
 # Example: Given a path C:/bla/foo/bar and assuming C:/bla/.git exists and
-# neither foo nor bar contain a file/directory .git. This wil return
+# neither foo nor bar contain a file/directory .git. This will return
 # C:/bla/.git
 #
 function(_git_find_closest_git_dir _start_dir _git_dir_var)

build/win_installer.iss

@@ -24,7 +24,7 @@ ExtraDiskSpaceRequired=15
 
 AppID={{621A23E0-3CF4-4BD6-97BC-4835EA5206A2}
 AppVerName={#I2Pd_AppName}
-AppCopyright=Copyright (c) 2013-2022, The PurpleI2P Project
+AppCopyright=Copyright (c) 2013-2024, The PurpleI2P Project
 AppPublisherURL=http://i2pd.website/
 AppSupportURL=https://github.com/PurpleI2P/i2pd/issues
 AppUpdatesURL=https://github.com/PurpleI2P/i2pd/releases

contrib/apparmor/usr.bin.i2pd

@@ -4,7 +4,7 @@
 #
 #include <tunables/global>
 
-profile i2pd /{usr/,}sbin/i2pd {
+profile i2pd /{usr/,}bin/i2pd {
   #include <abstractions/base>
   #include <abstractions/openssl>
   #include <abstractions/nameservice>
@@ -14,12 +14,12 @@ profile i2pd /{usr/,}sbin/i2pd {
   /var/lib/i2pd/** rw,
   /var/log/i2pd/i2pd.log w,
   /{var/,}run/i2pd/i2pd.pid rwk,
-  /{usr/,}sbin/i2pd mr,
+  /{usr/,}bin/i2pd mr,
   @{system_share_dirs}/i2pd/** r,
 
   # user homedir (if started not by init.d or systemd)
   owner @{HOME}/.i2pd/   rw,
   owner @{HOME}/.i2pd/** rwk,
 
-  #include if exists <local/usr.sbin.i2pd>
+  #include if exists <local/usr.bin.i2pd>
 }

contrib/certificates/reseed/hiduser0_at_mail.i2p.crt

@@ -1,32 +0,0 @@
------BEGIN CERTIFICATE-----
-MIIFgTCCA2mgAwIBAgIETWAY1DANBgkqhkiG9w0BAQ0FADBxMQswCQYDVQQGEwJY
-WDELMAkGA1UECAwCWFgxCzAJBgNVBAcMAlhYMR4wHAYDVQQKDBVJMlAgQW5vbnlt
-b3VzIE5ldHdvcmsxDDAKBgNVBAsMA0kyUDEaMBgGA1UEAwwRaGlkdXNlcjBAbWFp
-bC5pMnAwHhcNMjExMjEzMTU0MDI3WhcNMzExMjExMTU0MDI3WjBxMQswCQYDVQQG
-EwJYWDELMAkGA1UECAwCWFgxCzAJBgNVBAcMAlhYMR4wHAYDVQQKDBVJMlAgQW5v
-bnltb3VzIE5ldHdvcmsxDDAKBgNVBAsMA0kyUDEaMBgGA1UEAwwRaGlkdXNlcjBA
-bWFpbC5pMnAwggIiMA0GCSqGSIb3DQEBAQUAA4ICDwAwggIKAoICAQDXnjJ8UQ0f
-lHHpfPMiHofBPSuL4sbOJY6fOXwPhSg/h6THh9DS/ZWmJXQ3qRD0glDVtv4/Dr/9
-ldGQ5eltF9iCFXCQlMEy2HjQrBKq0nsl7RpYK12cyMaod0kkzCUk9ITLi9CmHM3Z
-gQZcmG8TWjFEpDR+idx/QkQt2pcO4vzWlDit3Vh4ivnbX5jGQHbsVjQEMQWxr+pX
-dsS+YQpjZ6RBmrooGTPO8QDOOeYLAn0lCjmffc/kzIH9E/p4/O0rOpyhVYbdxUD1
-5wkqN9l4yrtxmORG/PudnRQQ0r4TUq8vsxfGY0Euo9IbhgXF2Parel1ZhDxB1WZV
-VwWtgLIh9jGA1UMa8SYKnEfp8LWNZ3b3mUUnZb3kMrLk6jGYRWNsHmamhd4mC7AZ
-qf/8lOkEIw3bPd3YguCDRVcLui5BwIEZmqXg8uoESxfO/sW3pBrN/8M7MkTex9kN
-vjitGDDXvenK27qmNgZxbBlX72yTSfys7XTYTLnxZC8AwdAo2Wz9Z6HhGiPonf2h
-vZkc9ZxuE0jFIrsbJra4X7iyjXgi4vV4ARNg/9Ft6F4/OIbECgeDcBQqq4TlT2bZ
-EfWVrBbqXoj5vNsLigIkd+AyUNwPYEcB5IFSiiOh98pC7BH3pg0m8U5YBjxe1i+9
-EQOOG0Qtx+JigXZHu6bGE0Twy9zy+UzoKQIDAQABoyEwHzAdBgNVHQ4EFgQUGK1b
-0DkL6aLalcfBc/Uj/SF08C0wDQYJKoZIhvcNAQENBQADggIBAMpXM82bJDpH1TlH
-TvhU3Z7nfZdvEhOQfujaFUYiuNripuEKcFGn948+DvAG0FUN+uNlJoqOVs8D7InD
-gWlA9zpqw5Cl5Hij/Wns9QbXuAHJeA23fVUoaM2A6v9ifcIQ1A+rDuRQAo6/64KW
-ChTg2e99RBpfGOyqgeh7tLLe0lPPekVpKHFuXabokaKRDuBcVHcUL4tWXe3dcyqa
-Ej/PJrrS+nWL0EGZ4q80CEd2LPuDzPxNGCJt/R7ZfadENWajcgcXGceh1QBzozrB
-SL/Ya6wF9SrsB7V/r5wX0LM4ZdDaLWbtmUe5Op0h/ZMH25Sa8xAXVz+O9L6sWSoO
-FaiYTOvAiyyPz+nsxKa3xYryDHno7eKSt+hGOcaurhxbdZaEFY/CegEc73tCt9xK
-e9qF8O/WkDLmixuErw3f5en4IfzGR7p3lJAwW/8WD8C6HS39h/eE7dVZNaWgtQnZ
-SgGjgZMTJqTcQ3aZmfuCZefxGFok8w6AIkdbnd1pdMBRjYu8aXgl2hQSB9ZADDE9
-R5d3rXi0PkSFLIvsNjVa5KXrZk/tB0Hpfmepq7CufBqjP/LG9TieRoXzLYUKFF74
-QRwjP+y7AJ+VDUTpY1NV1P+k+2raubU2bOnLF3zL5DtyoyieGPhyeMMvp0fRIxdg
-bSl5VHgPXHNM8mcnndMAuzvl7jEK
------END CERTIFICATE-----

contrib/certificates/reseed/ls_at_mail.i2p.crt

@@ -1,32 +0,0 @@
------BEGIN CERTIFICATE-----
-MIIFdTCCA12gAwIBAgIEQ5vCxzANBgkqhkiG9w0BAQ0FADBrMQswCQYDVQQGEwJY
-WDELMAkGA1UECAwCWFgxCzAJBgNVBAcMAlhYMR4wHAYDVQQKDBVJMlAgQW5vbnlt
-b3VzIE5ldHdvcmsxDDAKBgNVBAsMA0kyUDEUMBIGA1UEAwwLbHNAbWFpbC5pMnAw
-HhcNMjMxMDE2MjAwNTA5WhcNMzMxMDEzMjAwNTA5WjBrMQswCQYDVQQGEwJYWDEL
-MAkGA1UECAwCWFgxCzAJBgNVBAcMAlhYMR4wHAYDVQQKDBVJMlAgQW5vbnltb3Vz
-IE5ldHdvcmsxDDAKBgNVBAsMA0kyUDEUMBIGA1UEAwwLbHNAbWFpbC5pMnAwggIi
-MA0GCSqGSIb3DQEBAQUAA4ICDwAwggIKAoICAQDPcbKRtf4PzrDa0iRit0XrwnmA
-2c1fJhkBipdPor7gMOAlkR82H1lkZSizR7kTZnr7vYqjDrOQr7bl5Dy3qo8/YCbZ
-jsnUCTIIgIJQUxUlR40RjaSXphqzUEiXKHR6b0RahhFisQ3hlbbgzSch5YgSLKws
-hOLi+eDSXw+HlwHlWFlT1XOKxSTJ/F3Bv40gxqZVC2pbxiPOeRZHQ6Ojw75lxTSF
-gww2WzgztiWt4X9BO1yepnVqhAVRPmTfGUMfKzq9jkMzZKeQFV4uZSP9nCqzEpYd
-WNDUfpTWiAQ9F+BwFXGusXXA3tGVwS7s6IEoiJFM5fsoJYfRoWGh3/1eirhBXW7U
-M6oubMSTADyrvfjLfJBMmMnc2hNblRlKr0ZKUjMfv8cnyT4kQxlXLAHHXY2P89TM
-TEVODkU48gnv6tC4t1JCb1/Da+3yVMjNX6rCzQfUwnLFrWthrwiI0NivAKFtiZjq
-w1/ZQcYke2YyeqcfXMn+NTUA22Sm2mJoMo7jUf+rbM9Pi27/DncJgRGj5qwY0D3S
-gc7829EjuZNPttGBmae1EmO7WQMB32cqdmItnV2FXpMhnn9h0u5H52kYqwn+mdtc
-dTJRcbfKG1RTr3UjFISaTwL8qigMIkVXIzcpnr/R/sSeEs8xCqfsJ6rb4dCyFx+M
-hqQcOCL5tumyd4W/LQIDAQABoyEwHzAdBgNVHQ4EFgQUgfaOG5HCnlW82wZ5BahL
-GRO06igwDQYJKoZIhvcNAQENBQADggIBAKdVpqS9qF7gGotgXaVA1iP5YNsWlTvG
-daGqeA/87//U21W6gpq82FhzsmsvUtXZfIeVIlDPI7WNDzS+A3K/KKrwM7dLgSie
-r9eMl3D8WYPU95QF4mAlRyl7PCCsYoVjyvfro0iq3/iudIA5476rjfLdTXRi5hAT
-qemPj0S+6sRjKEldRtGXrQATFlvLIWVYpgHijdDDx5M2hAz2y0mFxlDZTlA4BhL4
-DwtGlVKmbc2x5MvIQM4UhbQqkxYS4gXnzf5Qx9QIytHfTr/hmbrkhKR1GCO31BSk
-x9LhZxdI8LlwKSo6YgwXEB9E0M/tplaK9iZJFv4HPYLZrVJpb4IklMumyLMrgW5P
-fR0dgKn+R9lk0emJ1Cu+qyyzf1vsLycYBwaEztINn4VK+/HfDFpnVCvJOyNuDmj5
-KBLIoGdGoVfylmnc+e8zAXe+DY41fgniHMISOO78P8Bx9vTB+rhqnOUr9MzlUxPB
-sKGjbXy2YynEqiGb+9g344v/+ukTSDenqTPHVzJ5uOi0iedy+3ASzUNN6GJocovP
-167VOhwaETM0FwiKe0VdZRLLbbZ79CtJC0tmgcgPQPRa9Ldr6KN7u1J3D6lUp6zl
-byPom10ueKONRb36t7ai79l2SEUZRSMkx6AXIU0JJ1SMtQtav7b5LkpYJfdL7+vO
-dDx2/Za0VmdD
------END CERTIFICATE-----

contrib/debian/trusty/patches/01-upnp.patch

@@ -2,13 +2,13 @@ Description: Enable UPnP usage in package
 Author: r4sas <r4sas@i2pmail.org>
 
 Reviewed-By: r4sas <r4sas@i2pmail.org>
-Last-Update: 2022-03-23
+Last-Update: 2024-12-30
 
 --- i2pd.orig/Makefile
 +++ i2pd/Makefile
-@@ -31,7 +31,7 @@ include filelist.mk
+@@ -31,7 +31,7 @@ # import source files lists
+ include filelist.mk
  
- USE_AESNI       := $(or $(USE_AESNI),yes)
  USE_STATIC      := $(or $(USE_STATIC),no)
 -USE_UPNP        := $(or $(USE_UPNP),no)
 +USE_UPNP        := $(or $(USE_UPNP),yes)

contrib/debian/trusty/patches/02-service.patch

@@ -2,7 +2,7 @@ Description: Disable LogsDirectory and LogsDirectoryMode options in service
 Author: r4sas <r4sas@i2pmail.org>
 
 Reviewed-By: r4sas <r4sas@i2pmail.org>
-Last-Update: 2023-05-17
+Last-Update: 2024-07-19
 
 --- a/contrib/i2pd.service
 +++ b/contrib/i2pd.service
@@ -15,5 +15,5 @@ Last-Update: 2023-05-17
 +#LogsDirectory=i2pd
 +#LogsDirectoryMode=0700
  Type=forking
- ExecStart=/usr/sbin/i2pd --conf=/etc/i2pd/i2pd.conf --tunconf=/etc/i2pd/tunnels.conf --tunnelsdir=/etc/i2pd/tunnels.conf.d --pidfile=/run/i2pd/i2pd.pid --logfile=/var/log/i2pd/i2pd.log --daemon --service
+ ExecStart=/usr/bin/i2pd --conf=/etc/i2pd/i2pd.conf --tunconf=/etc/i2pd/tunnels.conf --tunnelsdir=/etc/i2pd/tunnels.conf.d --pidfile=/run/i2pd/i2pd.pid --logfile=/var/log/i2pd/i2pd.log --daemon --service
  ExecReload=/bin/sh -c "kill -HUP $MAINPID"

contrib/debian/xenial/patches/01-upnp.patch

@@ -2,13 +2,13 @@ Description: Enable UPnP usage in package
 Author: r4sas <r4sas@i2pmail.org>
 
 Reviewed-By: r4sas <r4sas@i2pmail.org>
-Last-Update: 2022-03-23
+Last-Update: 2024-12-30
 
 --- i2pd.orig/Makefile
 +++ i2pd/Makefile
-@@ -31,7 +31,7 @@ include filelist.mk
+@@ -31,7 +31,7 @@ # import source files lists
+ include filelist.mk
  
- USE_AESNI       := $(or $(USE_AESNI),yes)
  USE_STATIC      := $(or $(USE_STATIC),no)
 -USE_UPNP        := $(or $(USE_UPNP),no)
 +USE_UPNP        := $(or $(USE_UPNP),yes)

contrib/debian/xenial/patches/02-service.patch

@@ -2,7 +2,7 @@ Description: Disable LogsDirectory and LogsDirectoryMode options in service
 Author: r4sas <r4sas@i2pmail.org>
 
 Reviewed-By: r4sas <r4sas@i2pmail.org>
-Last-Update: 2023-05-17
+Last-Update: 2024-07-19
 
 --- a/contrib/i2pd.service
 +++ b/contrib/i2pd.service
@@ -15,5 +15,5 @@ Last-Update: 2023-05-17
 +#LogsDirectory=i2pd
 +#LogsDirectoryMode=0700
  Type=forking
- ExecStart=/usr/sbin/i2pd --conf=/etc/i2pd/i2pd.conf --tunconf=/etc/i2pd/tunnels.conf --tunnelsdir=/etc/i2pd/tunnels.conf.d --pidfile=/run/i2pd/i2pd.pid --logfile=/var/log/i2pd/i2pd.log --daemon --service
+ ExecStart=/usr/bin/i2pd --conf=/etc/i2pd/i2pd.conf --tunconf=/etc/i2pd/tunnels.conf --tunnelsdir=/etc/i2pd/tunnels.conf.d --pidfile=/run/i2pd/i2pd.pid --logfile=/var/log/i2pd/i2pd.log --daemon --service
  ExecReload=/bin/sh -c "kill -HUP $MAINPID"

contrib/i2pd.conf

@@ -243,7 +243,7 @@ verify = true
 ## Default: reg.i2p at "mainline" I2P Network
 # defaulturl = http://shx5vqsw7usdaunyzr2qmes2fq37oumybpudrd4jjj4e4vk4uusa.b32.i2p/hosts.txt
 ## Optional subscriptions URLs, separated by comma
-# subscriptions = http://reg.i2p/hosts.txt,http://identiguy.i2p/hosts.txt,http://stats.i2p/cgi-bin/newhosts.txt,http://rus.i2p/hosts.txt
+# subscriptions = http://reg.i2p/hosts.txt,http://identiguy.i2p/hosts.txt,http://stats.i2p/cgi-bin/newhosts.txt
 
 [limits]
 ## Maximum active transit sessions (default: 5000)
@@ -277,9 +277,3 @@ verify = true
 ## Save full addresses on disk (default: true)
 # addressbook = true
 
-[cpuext]
-## Use CPU AES-NI instructions set when work with cryptography when available (default: true)
-# aesni = true
-## Force usage of CPU instructions set, even if they not found (default: false)
-## DO NOT TOUCH that option if you really don't know what are you doing!
-# force = false

contrib/i2pd.service

@@ -11,7 +11,7 @@ RuntimeDirectoryMode=0700
 LogsDirectory=i2pd
 LogsDirectoryMode=0700
 Type=forking
-ExecStart=/usr/sbin/i2pd --conf=/etc/i2pd/i2pd.conf --tunconf=/etc/i2pd/tunnels.conf --tunnelsdir=/etc/i2pd/tunnels.conf.d --pidfile=/run/i2pd/i2pd.pid --logfile=/var/log/i2pd/i2pd.log --daemon --service
+ExecStart=/usr/bin/i2pd --conf=/etc/i2pd/i2pd.conf --tunconf=/etc/i2pd/tunnels.conf --tunnelsdir=/etc/i2pd/tunnels.conf.d --pidfile=/run/i2pd/i2pd.pid --logfile=/var/log/i2pd/i2pd.log --daemon --service
 ExecReload=/bin/sh -c "kill -HUP $MAINPID"
 PIDFile=/run/i2pd/i2pd.pid
 ### Uncomment, if auto restart needed

contrib/openrc/i2pd.openrc

@@ -7,7 +7,7 @@ tunconf="/etc/i2pd/tunnels.conf"
 tundir="/etc/i2pd/tunnels.conf.d"
 
 name="i2pd"
-command="/usr/sbin/i2pd"
+command="/usr/bin/i2pd"
 command_args="--service --daemon --log=file --logfile=$logfile --conf=$mainconf --tunconf=$tunconf --tunnelsdir=$tundir --pidfile=$pidfile"
 description="i2p router written in C++"
 required_dirs="/var/lib/i2pd"

contrib/rpm/i2pd-git.spec

@@ -1,7 +1,7 @@
 %define git_hash %(git rev-parse HEAD | cut -c -7)
 
 Name:          i2pd-git
-Version:       2.52.0
+Version:       2.56.0
 Release:       git%{git_hash}%{?dist}
 Summary:       I2P router written in C++
 Conflicts:     i2pd
@@ -24,6 +24,10 @@ BuildRequires: openssl-devel
 BuildRequires: miniupnpc-devel
 BuildRequires: systemd-units
 
+%if 0%{?fedora} == 41
+BuildRequires: openssl-devel-engine
+%endif
+
 Requires:      logrotate
 Requires:      systemd
 Requires(pre): %{_sbindir}/useradd %{_sbindir}/groupadd
@@ -93,7 +97,7 @@ pushd build
 %endif
 
 chrpath -d i2pd
-%{__install} -D -m 755 i2pd %{buildroot}%{_sbindir}/i2pd
+%{__install} -D -m 755 i2pd %{buildroot}%{_bindir}/i2pd
 %{__install} -d -m 755 %{buildroot}%{_datadir}/i2pd
 %{__install} -d -m 700 %{buildroot}%{_sharedstatedir}/i2pd
 %{__install} -d -m 700 %{buildroot}%{_localstatedir}/log/i2pd
@@ -129,7 +133,7 @@ getent passwd i2pd >/dev/null || \
 
 %files
 %doc LICENSE README.md contrib/i2pd.conf contrib/subscriptions.txt contrib/tunnels.conf contrib/tunnels.d
-%{_sbindir}/i2pd
+%{_bindir}/i2pd
 %config(noreplace) %{_sysconfdir}/i2pd/*.conf
 %config(noreplace) %{_sysconfdir}/i2pd/tunnels.conf.d/*.conf
 %config %{_sysconfdir}/i2pd/subscriptions.txt
@@ -144,6 +148,21 @@ getent passwd i2pd >/dev/null || \
 
 
 %changelog
+* Sun Feb 09 2025 orignal <orignal@i2pmail.org> - 2.56.0
+- update to 2.56.0
+
+* Mon Dec 30 2024 orignal <orignal@i2pmail.org> - 2.55.0
+- update to 2.55.0
+
+* Sun Oct 6 2024 orignal <orignal@i2pmail.org> - 2.54.0
+- update to 2.54.0
+
+* Tue Jul 30 2024 orignal <orignal@i2pmail.org> - 2.53.1
+- update to 2.53.1
+
+* Fri Jul 19 2024 orignal <orignal@i2pmail.org> - 2.53.0
+- update to 2.53.0
+
 * Sun May 12 2024 orignal <orignal@i2pmail.org> - 2.52.0
 - update to 2.52.0
 

contrib/rpm/i2pd.spec

@@ -1,5 +1,5 @@
 Name:          i2pd
-Version:       2.52.0
+Version:       2.56.0
 Release:       1%{?dist}
 Summary:       I2P router written in C++
 Conflicts:     i2pd-git
@@ -22,6 +22,10 @@ BuildRequires: openssl-devel
 BuildRequires: miniupnpc-devel
 BuildRequires: systemd-units
 
+%if 0%{?fedora} == 41
+BuildRequires: openssl-devel-engine
+%endif
+
 Requires:      logrotate
 Requires:      systemd
 Requires(pre): %{_sbindir}/useradd %{_sbindir}/groupadd
@@ -91,7 +95,7 @@ pushd build
 %endif
 
 chrpath -d i2pd
-%{__install} -D -m 755 i2pd %{buildroot}%{_sbindir}/i2pd
+%{__install} -D -m 755 i2pd %{buildroot}%{_bindir}/i2pd
 %{__install} -d -m 755 %{buildroot}%{_datadir}/i2pd
 %{__install} -d -m 700 %{buildroot}%{_sharedstatedir}/i2pd
 %{__install} -d -m 700 %{buildroot}%{_localstatedir}/log/i2pd
@@ -127,7 +131,7 @@ getent passwd i2pd >/dev/null || \
 
 %files
 %doc LICENSE README.md contrib/i2pd.conf contrib/subscriptions.txt contrib/tunnels.conf contrib/tunnels.d
-%{_sbindir}/i2pd
+%{_bindir}/i2pd
 %config(noreplace) %{_sysconfdir}/i2pd/*.conf
 %config(noreplace) %{_sysconfdir}/i2pd/tunnels.conf.d/*.conf
 %config %{_sysconfdir}/i2pd/subscriptions.txt
@@ -142,6 +146,21 @@ getent passwd i2pd >/dev/null || \
 
 
 %changelog
+* Sun Feb 09 2025 orignal <orignal@i2pmail.org> - 2.56.0
+- update to 2.56.0
+
+* Mon Dec 30 2024 orignal <orignal@i2pmail.org> - 2.55.0
+- update to 2.55.0
+
+* Sun Oct 6 2024 orignal <orignal@i2pmail.org> - 2.54.0
+- update to 2.54.0
+
+* Tue Jul 30 2024 orignal <orignal@i2pmail.org> - 2.53.1
+- update to 2.53.1
+
+* Fri Jul 19 2024 orignal <orignal@i2pmail.org> - 2.53.0
+- update to 2.53.0
+
 * Sun May 12 2024 orignal <orignal@i2pmail.org> - 2.52.0
 - update to 2.52.0
 

contrib/tunnels.conf

@@ -5,6 +5,7 @@ port = 6668
 destination = irc.ilita.i2p
 destinationport = 6667
 keys = irc-keys.dat
+i2p.streaming.profile=2
 
 #[IRC-IRC2P]
 #type = client

contrib/upstart/i2pd.upstart

@@ -8,4 +8,4 @@ env LOGFILE="/var/log/i2pd/i2pd.log"
 
 expect fork
 
-exec /usr/sbin/i2pd --daemon --service --log=file --logfile=$LOGFILE
+exec /usr/bin/i2pd --daemon --service --log=file --logfile=$LOGFILE

daemon/Daemon.cpp

@@ -149,12 +149,10 @@ namespace util
 		LogPrint(eLogDebug, "FS: Certificates directory: ", certsdir);
 
 		bool precomputation; i2p::config::GetOption("precomputation.elgamal", precomputation);
-		bool aesni; i2p::config::GetOption("cpuext.aesni", aesni);
-		bool forceCpuExt; i2p::config::GetOption("cpuext.force", forceCpuExt);
 		bool ssu; i2p::config::GetOption("ssu", ssu);
 		if (!ssu && i2p::config::IsDefault ("precomputation.elgamal"))
 			precomputation = false; // we don't elgamal table if no ssu, unless it's specified explicitly
-		i2p::crypto::InitCrypto (precomputation, aesni, forceCpuExt);
+		i2p::crypto::InitCrypto (precomputation);
 
 		i2p::transport::InitAddressFromIface (); // get address4/6 from interfaces
 
@@ -188,7 +186,7 @@ namespace util
 		std::string bandwidth; i2p::config::GetOption("bandwidth", bandwidth);
 		if (bandwidth.length () > 0)
 		{
-			if (bandwidth[0] >= 'K' && bandwidth[0] <= 'X')
+			if (bandwidth.length () == 1 && ((bandwidth[0] >= 'K' && bandwidth[0] <= 'P') || bandwidth[0] == 'X' ))
 			{
 				i2p::context.SetBandwidth (bandwidth[0]);
 				LogPrint(eLogInfo, "Daemon: Bandwidth set to ", i2p::context.GetBandwidthLimit (), "KBps");

daemon/HTTPServer.cpp

@@ -417,6 +417,15 @@ namespace http {
 		}
 	}
 
+	static void ShowHop(std::stringstream& s, const i2p::data::IdentityEx& ident)
+	{
+		auto identHash = ident.GetIdentHash();
+		auto router = i2p::data::netdb.FindRouter(identHash);
+		s << i2p::data::GetIdentHashAbbreviation(identHash);
+		if (router)
+			s << "<small style=\"color:gray\"> " << router->GetBandwidthCap() << "</small>";
+	}
+
 	static void ShowLeaseSetDestination (std::stringstream& s, std::shared_ptr<const i2p::client::LeaseSetDestination> dest, uint32_t token)
 	{
 		s << "<b>Base32:</b><br>\r\n<textarea readonly cols=\"80\" rows=\"1\">";
@@ -482,7 +491,9 @@ namespace http {
 					it->VisitTunnelHops(
 						[&s](std::shared_ptr<const i2p::data::IdentityEx> hopIdent)
 						{
-							s << "&#8658; " << i2p::data::GetIdentHashAbbreviation (hopIdent->GetIdentHash ()) << " ";
+							s << "&#8658; ";
+							ShowHop(s, *hopIdent);
+							s << " ";
 						}
 					);
 				}
@@ -503,7 +514,9 @@ namespace http {
 					it->VisitTunnelHops(
 						[&s](std::shared_ptr<const i2p::data::IdentityEx> hopIdent)
 						{
-							s << " " << i2p::data::GetIdentHashAbbreviation (hopIdent->GetIdentHash ()) << " &#8658;";
+							s << " ";
+							ShowHop(s, *hopIdent);
+							s << " &#8658;";
 						}
 					);
 				}
@@ -688,6 +701,7 @@ namespace http {
 	{
 		s << "<b>" << tr("Tunnels") << ":</b><br>\r\n";
 		s << "<b>" << tr("Queue size") << ":</b> " << i2p::tunnel::tunnels.GetQueueSize () << "<br>\r\n<br>\r\n";
+		s << "<b>" << tr("TBM Queue size") << ":</b> " << i2p::tunnel::tunnels.GetTBMQueueSize () << "<br>\r\n<br>\r\n";
 
 		auto ExplPool = i2p::tunnel::tunnels.GetExploratoryPool ();
 
@@ -699,7 +713,9 @@ namespace http {
 				it->VisitTunnelHops(
 					[&s](std::shared_ptr<const i2p::data::IdentityEx> hopIdent)
 					{
-						s << "&#8658; " << i2p::data::GetIdentHashAbbreviation (hopIdent->GetIdentHash ()) << " ";
+						s << "&#8658; ";
+						ShowHop(s, *hopIdent);
+						s << " ";
 					}
 				);
 			}
@@ -720,7 +736,9 @@ namespace http {
 				it->VisitTunnelHops(
 					[&s](std::shared_ptr<const i2p::data::IdentityEx> hopIdent)
 					{
-						s << " " << i2p::data::GetIdentHashAbbreviation (hopIdent->GetIdentHash ()) << " &#8658;";
+						s << " ";
+						ShowHop(s, *hopIdent);
+						s << " &#8658;";
 					}
 				);
 			}
@@ -808,7 +826,7 @@ namespace http {
 		if (i2p::tunnel::tunnels.CountTransitTunnels())
 		{
 			s << "<b>" << tr("Transit Tunnels") << ":</b><br>\r\n";
-			s << "<table><thead><th>&#8658;</th><th>ID</th><th>&#8658;</th><th>" << tr("Amount") << "</th></thead><tbody class=\"tableitem\">";
+			s << "<table><thead><th>&#8658;</th><th>ID</th><th>&#8658;</th><th>" << tr("Amount") << "</th><th>" << tr("Next") << "</th></thead><tbody class=\"tableitem\">";
 			for (const auto& it: i2p::tunnel::tunnels.GetTransitTunnels ())
 			{
 				if (std::dynamic_pointer_cast<i2p::tunnel::TransitTunnelGateway>(it))
@@ -818,7 +836,7 @@ namespace http {
 				else
 					s << "<tr><td>&#8658;</td><td>" << it->GetTunnelID () << "</td><td>&#8658;</td><td>";
 				ShowTraffic(s, it->GetNumTransmittedBytes ());
-				s << "</td></tr>\r\n";
+				s << "</td><td>" << it->GetNextPeerName () << "</td></tr>\r\n";
 			}
 			s << "</tbody></table>\r\n";
 		}
@@ -1463,13 +1481,13 @@ namespace http {
 		reply.body = content;
 
 		m_SendBuffer = reply.to_string();
-		boost::asio::async_write (*m_Socket, boost::asio::buffer(m_SendBuffer),
+		boost::asio::async_write (*m_Socket, boost::asio::buffer(m_SendBuffer), boost::asio::transfer_all (), 
 			std::bind (&HTTPConnection::Terminate, shared_from_this (), std::placeholders::_1));
 	}
 
 	HTTPServer::HTTPServer (const std::string& address, int port):
-		m_IsRunning (false), m_Thread (nullptr), m_Work (m_Service),
-		m_Acceptor (m_Service, boost::asio::ip::tcp::endpoint (boost::asio::ip::address::from_string(address), port)),
+		m_IsRunning (false), m_Thread (nullptr), m_Work (m_Service.get_executor ()),
+		m_Acceptor (m_Service, boost::asio::ip::tcp::endpoint (boost::asio::ip::make_address(address), port)),
 		m_Hostname(address)
 	{
 	}

daemon/HTTPServer.h

@@ -83,8 +83,8 @@ namespace http
 
 			bool m_IsRunning;
 			std::unique_ptr<std::thread> m_Thread;
-			boost::asio::io_service m_Service;
-			boost::asio::io_service::work m_Work;
+			boost::asio::io_context m_Service;
+			boost::asio::executor_work_guard<boost::asio::io_context::executor_type> m_Work;
 			boost::asio::ip::tcp::acceptor m_Acceptor;
 			std::string m_Hostname;
 	};

daemon/I2PControl.cpp

@@ -8,14 +8,12 @@
 
 #include <stdio.h>
 #include <sstream>
+#include <iomanip>
 #include <openssl/x509.h>
 #include <openssl/pem.h>
 
 // Use global placeholders from boost introduced when local_time.hpp is loaded
 #define BOOST_BIND_GLOBAL_PLACEHOLDERS
-
-#include <boost/date_time/local_time/local_time.hpp>
-#include <boost/date_time/posix_time/posix_time.hpp>
 #include <boost/property_tree/json_parser.hpp>
 #include <boost/lexical_cast.hpp>
 
@@ -33,7 +31,7 @@ namespace client
 {
 	I2PControlService::I2PControlService (const std::string& address, int port):
 		m_IsRunning (false), m_Thread (nullptr),
-		m_Acceptor (m_Service, boost::asio::ip::tcp::endpoint(boost::asio::ip::address::from_string(address), port)),
+		m_Acceptor (m_Service, boost::asio::ip::tcp::endpoint(boost::asio::ip::make_address(address), port)),
 		m_SSLContext (boost::asio::ssl::context::sslv23),
 		m_ShutdownTimer (m_Service)
 	{
@@ -47,15 +45,29 @@ namespace client
 			i2pcp_crt = i2p::fs::DataDirPath(i2pcp_crt);
 		if (i2pcp_key.at(0) != '/')
 			i2pcp_key = i2p::fs::DataDirPath(i2pcp_key);
-		if (!i2p::fs::Exists (i2pcp_crt) || !i2p::fs::Exists (i2pcp_key)) {
+		if (!i2p::fs::Exists (i2pcp_crt) || !i2p::fs::Exists (i2pcp_key)) 
+		{
 			LogPrint (eLogInfo, "I2PControl: Creating new certificate for control connection");
 			CreateCertificate (i2pcp_crt.c_str(), i2pcp_key.c_str());
-		} else {
+		} 
+		else 
 			LogPrint(eLogDebug, "I2PControl: Using cert from ", i2pcp_crt);
-		}
 		m_SSLContext.set_options (boost::asio::ssl::context::default_workarounds | boost::asio::ssl::context::no_sslv2 | boost::asio::ssl::context::single_dh_use);
-		m_SSLContext.use_certificate_file (i2pcp_crt, boost::asio::ssl::context::pem);
-		m_SSLContext.use_private_key_file (i2pcp_key, boost::asio::ssl::context::pem);
+		boost::system::error_code ec;
+		m_SSLContext.use_certificate_file (i2pcp_crt, boost::asio::ssl::context::pem, ec);
+		if (!ec)		
+			m_SSLContext.use_private_key_file (i2pcp_key, boost::asio::ssl::context::pem, ec);
+		if (ec)
+		{
+			LogPrint (eLogInfo, "I2PControl: Failed to load ceritifcate: ", ec.message (), ". Recreating");
+			CreateCertificate (i2pcp_crt.c_str(), i2pcp_key.c_str());
+			m_SSLContext.use_certificate_file (i2pcp_crt, boost::asio::ssl::context::pem, ec);
+			if (!ec)		
+				m_SSLContext.use_private_key_file (i2pcp_key, boost::asio::ssl::context::pem, ec);
+			if (ec) 
+				// give up
+				LogPrint (eLogError, "I2PControl: Can't load certificates");
+		}	
 
 		// handlers
 		m_MethodHandlers["Authenticate"]       = &I2PControlService::AuthenticateHandler;
@@ -258,9 +270,9 @@ namespace client
 			header << "Content-Length: " << boost::lexical_cast<std::string>(len) << "\r\n";
 			header << "Content-Type: application/json\r\n";
 			header << "Date: ";
-			auto facet = new boost::local_time::local_time_facet ("%a, %d %b %Y %H:%M:%S GMT");
-			header.imbue(std::locale (header.getloc(), facet));
-			header << boost::posix_time::second_clock::local_time() << "\r\n";
+			std::time_t t = std::time (nullptr);
+    		std::tm tm = *std::gmtime (&t);
+			header << std::put_time(&tm, "%a, %d %b %Y %T GMT") << "\r\n";
 			header << "\r\n";
 			offset = header.str ().size ();
 			memcpy (buf->data (), header.str ().c_str (), offset);
@@ -405,7 +417,7 @@ namespace client
 			X509_NAME_add_entry_by_txt (name, "O",  MBSTRING_ASC, (unsigned char *)I2P_CONTROL_CERTIFICATE_ORGANIZATION, -1, -1, 0); // organization
 			X509_NAME_add_entry_by_txt (name, "CN", MBSTRING_ASC, (unsigned char *)I2P_CONTROL_CERTIFICATE_COMMON_NAME, -1, -1, 0); // common name
 			X509_set_issuer_name (x509, name); // set issuer to ourselves
-			X509_sign (x509, pkey, EVP_sha1 ()); // sign
+			X509_sign (x509, pkey, EVP_sha1 ()); // sign, last param must be NULL for EdDSA
 
 			// save cert
 			if ((f = fopen (crt_path, "wb")) != NULL) {

daemon/I2PControl.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2022, The PurpleI2P Project
+* Copyright (c) 2013-2024, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -88,7 +88,7 @@ namespace client
 			bool m_IsRunning;
 			std::thread * m_Thread;
 
-			boost::asio::io_service m_Service;
+			boost::asio::io_context m_Service;
 			boost::asio::ip::tcp::acceptor m_Acceptor;
 			boost::asio::ssl::context m_SSLContext;
 			boost::asio::deadline_timer m_ShutdownTimer;

daemon/UPnP.cpp

@@ -52,7 +52,7 @@ namespace transport
 	{
 		m_IsRunning = true;
 		LogPrint(eLogInfo, "UPnP: Starting");
-		m_Service.post (std::bind (&UPnP::Discover, this));
+		boost::asio::post (m_Service, std::bind (&UPnP::Discover, this));
 		std::unique_lock<std::mutex> l(m_StartedMutex);
 		m_Thread.reset (new std::thread (std::bind (&UPnP::Run, this)));
 		m_Started.wait_for (l, std::chrono::seconds (5)); // 5 seconds maximum
@@ -115,10 +115,16 @@ namespace transport
 			return;
 		}
 
+#if (MINIUPNPC_API_VERSION >= 18)
+		err = UPNP_GetValidIGD (m_Devlist, &m_upnpUrls, &m_upnpData, m_NetworkAddr, sizeof (m_NetworkAddr),
+					m_externalIPAddress, sizeof (m_externalIPAddress));
+#else
 		err = UPNP_GetValidIGD (m_Devlist, &m_upnpUrls, &m_upnpData, m_NetworkAddr, sizeof (m_NetworkAddr));
+#endif
 		m_upnpUrlsInitialized=err!=0;
 		if (err == UPNP_IGD_VALID_CONNECTED)
 		{
+#if (MINIUPNPC_API_VERSION < 18)
 			err = UPNP_GetExternalIPAddress (m_upnpUrls.controlURL, m_upnpData.first.servicetype, m_externalIPAddress);
 			if(err != UPNPCOMMAND_SUCCESS)
 			{
@@ -126,6 +132,7 @@ namespace transport
 				return;
 			}
 			else
+#endif
 			{
 				LogPrint (eLogError, "UPnP: Found Internet Gateway Device ", m_upnpUrls.controlURL);
 				if (!m_externalIPAddress[0])
@@ -143,7 +150,7 @@ namespace transport
 
 		// UPnP discovered
 		LogPrint (eLogDebug, "UPnP: ExternalIPAddress is ", m_externalIPAddress);
-		i2p::context.UpdateAddress (boost::asio::ip::address::from_string (m_externalIPAddress));
+		i2p::context.UpdateAddress (boost::asio::ip::make_address (m_externalIPAddress));
 		// port mapping
 		PortMapping ();
 	}

daemon/UPnP.h

@@ -67,7 +67,7 @@ namespace transport
 			std::unique_ptr<std::thread> m_Thread;
 			std::condition_variable m_Started;
 			std::mutex m_StartedMutex;
-			boost::asio::io_service m_Service;
+			boost::asio::io_context m_Service;
 			boost::asio::deadline_timer m_Timer;
 			bool m_upnpUrlsInitialized = false;
 			struct UPNPUrls m_upnpUrls;

daemon/UnixDaemon.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2020, The PurpleI2P Project
+* Copyright (c) 2013-2024, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -25,6 +25,7 @@
 #include "RouterContext.h"
 #include "ClientContext.h"
 #include "Transports.h"
+#include "util.h"
 
 void handle_signal(int sig)
 {
@@ -220,6 +221,7 @@ namespace i2p
 
 		void DaemonLinux::run ()
 		{
+			i2p::util::SetThreadName ("i2pd-daemon");
 			while (running)
 			{
 				std::this_thread::sleep_for (std::chrono::seconds(1));

debian/NEWS

@@ -0,0 +1,5 @@
+i2pd (2.53.0-1) unstable; urgency=medium
+
+  i2pd binary moved from /usr/sbin to /usr/bin. Please check your scripts if you used the old path.
+
+ -- r4sas <r4sas@i2pmail.org>  Fri, 19 Jul 2024 16:00:00 +0000

debian/changelog

@@ -1,3 +1,34 @@
+i2pd (2.56.0-1) unstable; urgency=medium
+
+  * updated to version 2.56.0/0.9.65
+
+ -- orignal <orignal@i2pmail.org>  Sun, 09 Feb 2025 16:00:00 +0000
+
+i2pd (2.55.0-1) unstable; urgency=medium
+
+  * updated to version 2.55.0
+
+ -- orignal <orignal@i2pmail.org>  Mon, 30 Dec 2024 16:00:00 +0000
+
+i2pd (2.54.0-1) unstable; urgency=medium
+
+  * updated to version 2.54.0/0.9.64
+
+ -- orignal <orignal@i2pmail.org>  Sun, 6 Oct 2024 16:00:00 +0000
+
+i2pd (2.53.1-1) unstable; urgency=medium
+
+  * updated to version 2.53.1
+
+ -- orignal <orignal@i2pmail.org>  Tue, 30 Jul 2024 16:00:00 +0000
+
+i2pd (2.53.0-1) unstable; urgency=medium
+
+  * updated to version 2.53.0/0.9.63
+  * binary moved from /usr/sbin to /usr/bin
+
+ -- r4sas <r4sas@i2pmail.org>  Sat, 20 Jul 2024 15:10:00 +0000
+
 i2pd (2.52.0-1) unstable; urgency=medium
 
   * updated to version 2.52.0

debian/i2pd.init

@@ -13,7 +13,7 @@
 PATH=/sbin:/usr/sbin:/bin:/usr/bin
 DESC=i2pd                 # Introduce a short description here
 NAME=i2pd                 # Introduce the short server's name here
-DAEMON=/usr/sbin/$NAME    # Introduce the server's location here
+DAEMON=/usr/bin/$NAME    # Introduce the server's location here
 DAEMON_OPTS=""            # Arguments to run the daemon with
 PIDFILE=/var/run/$NAME/$NAME.pid
 I2PCONF=/etc/$NAME/i2pd.conf

debian/i2pd.install

@@ -1,6 +1,6 @@
-i2pd usr/sbin/
+i2pd usr/bin/
 contrib/i2pd.conf etc/i2pd/
 contrib/tunnels.conf etc/i2pd/
 contrib/certificates/ usr/share/i2pd/
 contrib/tunnels.d/README etc/i2pd/tunnels.conf.d/
-contrib/apparmor/usr.sbin.i2pd etc/apparmor.d
+contrib/apparmor/usr.bin.i2pd etc/apparmor.d

debian/patches/01-upnp.patch

@@ -2,13 +2,13 @@ Description: Enable UPnP usage in package
 Author: r4sas <r4sas@i2pmail.org>
 
 Reviewed-By: r4sas <r4sas@i2pmail.org>
-Last-Update: 2022-03-23
+Last-Update: 2024-12-30
 
 --- i2pd.orig/Makefile
 +++ i2pd/Makefile
-@@ -31,7 +31,7 @@ include filelist.mk
+@@ -31,7 +31,7 @@ # import source files lists
+ include filelist.mk
  
- USE_AESNI       := $(or $(USE_AESNI),yes)
  USE_STATIC      := $(or $(USE_STATIC),no)
 -USE_UPNP        := $(or $(USE_UPNP),no)
 +USE_UPNP        := $(or $(USE_UPNP),yes)

i18n/Chinese.cpp

@@ -64,7 +64,7 @@ namespace chinese // language namespace
 		{"Full cone NAT", "全锥型NAT"},
 		{"No Descriptors", "无描述符"},
 		{"Uptime", "运行时间"},
-		{"Network status", "IPv4 网络状态"},
+		{"Network status", "网络状态"},
 		{"Network status v6", "IPv6 网络状态"},
 		{"Stopping in", "距停止还有："},
 		{"Family", "家族"},

libi2pd/Blinding.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2022, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -152,11 +152,11 @@ namespace data
 			m_BlindedSigType = m_SigType;
 	}
 
-	BlindedPublicKey::BlindedPublicKey (const std::string& b33):
+	BlindedPublicKey::BlindedPublicKey (std::string_view b33):
 		m_SigType (0) // 0 means invalid, we can't blind DSA, set it later
 	{
 		uint8_t addr[40]; // TODO: define length from b33
-		size_t l = i2p::data::Base32ToByteStream (b33.c_str (), b33.length (), addr, 40);
+		size_t l = i2p::data::Base32ToByteStream (b33.data (), b33.length (), addr, 40);
 		if (l < 32)
 		{
 			LogPrint (eLogError, "Blinding: Malformed b33 ", b33);

libi2pd/Blinding.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2020, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -11,6 +11,7 @@
 
 #include <inttypes.h>
 #include <string>
+#include <string_view>
 #include <vector>
 #include "Identity.h"
 
@@ -23,7 +24,7 @@ namespace data
 		public:
 
 			BlindedPublicKey (std::shared_ptr<const IdentityEx> identity, bool clientAuth = false);
-			BlindedPublicKey (const std::string& b33); // from b33 without .b32.i2p
+			BlindedPublicKey (std::string_view b33); // from b33 without .b32.i2p
 			std::string ToB33 () const;
 
 			const uint8_t * GetPublicKey () const { return m_PublicKey.data (); };

libi2pd/CPU.cpp

@@ -1,68 +0,0 @@
-/*
-* Copyright (c) 2013-2023, The PurpleI2P Project
-*
-* This file is part of Purple i2pd project and licensed under BSD3
-*
-* See full license text in LICENSE file at top of project tree
-*/
-
-#include "CPU.h"
-#include "Log.h"
-
-#ifndef bit_AES
-	#define bit_AES (1 << 25)
-#endif
-
-#if defined(__GNUC__) && __GNUC__ < 6 && IS_X86
-	#include <cpuid.h>
-#endif
-
-#ifdef _MSC_VER
-	#include <intrin.h>
-#endif
-
-namespace i2p
-{
-namespace cpu
-{
-	bool aesni = false;
-
-	inline bool cpu_support_aes()
-	{
-#if IS_X86
-#if defined(__clang__)
-#	if (__clang_major__ >= 6)
-		__builtin_cpu_init();
-#	endif
-		return __builtin_cpu_supports("aes");
-#elif (defined(__GNUC__) && __GNUC__ >= 6)
-		__builtin_cpu_init();
-		return __builtin_cpu_supports("aes");
-#elif (defined(__GNUC__) && __GNUC__ < 6)
-		int cpu_info[4];
-		bool flag = false;
-		__cpuid(0, cpu_info[0], cpu_info[1], cpu_info[2], cpu_info[3]);
-		if (cpu_info[0] >= 0x00000001) {
-			__cpuid(0x00000001, cpu_info[0], cpu_info[1], cpu_info[2], cpu_info[3]);
-			flag = ((cpu_info[2] & bit_AES) != 0);
-		}
-		return flag;
-#elif defined(_MSC_VER)
-		int cpu_info[4];
-		__cpuid(cpu_info, 1);
-		return ((cpu_info[2] & bit_AES) != 0);
-#endif
-#endif
-		return false;
-	}
-
-	void Detect(bool AesSwitch, bool force)
-	{
-		if ((cpu_support_aes() && AesSwitch) || (AesSwitch && force)) {
-			aesni = true;
-		}
-
-		LogPrint(eLogInfo, "AESNI ", (aesni ? "enabled" : "disabled"));
-	}
-}
-}

libi2pd/CPU.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2023, The PurpleI2P Project
+* Copyright (c) 2013-2024, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -21,20 +21,4 @@
 #	define IS_X86_64 0
 #endif
 
-#if defined(__AES__) && !defined(_MSC_VER) && IS_X86
-#	define SUPPORTS_AES 1
-#else
-#	define SUPPORTS_AES 0
-#endif
-
-namespace i2p
-{
-namespace cpu
-{
-	extern bool aesni;
-
-	void Detect(bool AesSwitch, bool force);
-}
-}
-
 #endif

libi2pd/ChaCha20.cpp

@@ -1,137 +0,0 @@
-/*
-* Copyright (c) 2013-2020, The PurpleI2P Project
-*
-* This file is part of Purple i2pd project and licensed under BSD3
-*
-* See full license text in LICENSE file at top of project tree
-*
-* Kovri go write your own code
-*
-*/
-
-#include "I2PEndian.h"
-#include "ChaCha20.h"
-
-#if !OPENSSL_AEAD_CHACHA20_POLY1305
-namespace i2p
-{
-namespace crypto
-{
-namespace chacha
-{
-void u32t8le(uint32_t v, uint8_t * p)
-{
-	p[0] = v & 0xff;
-	p[1] = (v >> 8) & 0xff;
-	p[2] = (v >> 16) & 0xff;
-	p[3] = (v >> 24) & 0xff;
-}
-
-uint32_t u8t32le(const uint8_t * p)
-{
-	uint32_t value = p[3];
-
-	value = (value << 8) | p[2];
-	value = (value << 8) | p[1];
-	value = (value << 8) | p[0];
-
-	return value;
-}
-
-uint32_t rotl32(uint32_t x, int n)
-{
-	return x << n | (x >> (-n & 31));
-}
-
-void quarterround(uint32_t *x, int a, int b, int c, int d)
-{
-	x[a] += x[b]; x[d] = rotl32(x[d] ^ x[a], 16);
-	x[c] += x[d]; x[b] = rotl32(x[b] ^ x[c], 12);
-	x[a] += x[b]; x[d] = rotl32(x[d] ^ x[a],  8);
-	x[c] += x[d]; x[b] = rotl32(x[b] ^ x[c],  7);
-}
-
-
-void Chacha20Block::operator << (const Chacha20State & st)
-{
-	int i;
-	for (i = 0; i < 16; i++)
-		u32t8le(st.data[i], data + (i << 2));
-}
-
-void block (Chacha20State &input, int rounds)
-{
-	int i;
-	Chacha20State x;
-	x.Copy(input);
-
-	for (i = rounds; i > 0; i -= 2)
-	{
-		quarterround(x.data, 0, 4,  8, 12);
-		quarterround(x.data, 1, 5,  9, 13);
-		quarterround(x.data, 2, 6, 10, 14);
-		quarterround(x.data, 3, 7, 11, 15);
-		quarterround(x.data, 0, 5, 10, 15);
-		quarterround(x.data, 1, 6, 11, 12);
-		quarterround(x.data, 2, 7,  8, 13);
-		quarterround(x.data, 3, 4,  9, 14);
-	}
-	x += input;
-	input.block << x;
-}
-
-void Chacha20Init (Chacha20State& state, const uint8_t * nonce, const uint8_t * key, uint32_t counter)
-{
-	state.data[0] = 0x61707865;
-	state.data[1] = 0x3320646e;
-	state.data[2] = 0x79622d32;
-	state.data[3] = 0x6b206574;
-	for (size_t i = 0; i < 8; i++)
-		state.data[4 + i] = chacha::u8t32le(key + i * 4);
-
-	state.data[12] = htole32 (counter);
-	for (size_t i = 0; i < 3; i++)
-		state.data[13 + i] = chacha::u8t32le(nonce + i * 4);
-}
-
-void Chacha20SetCounter (Chacha20State& state, uint32_t counter)
-{
-	state.data[12] = htole32 (counter);
-	state.offset = 0;
-}
-
-void Chacha20Encrypt (Chacha20State& state, uint8_t * buf, size_t sz)
-{
-	if (state.offset > 0)
-	{
-		// previous block if any
-		auto s = chacha::blocksize - state.offset;
-		if (sz < s) s = sz;
-		for (size_t i = 0; i < s; i++)
-			buf[i] ^= state.block.data[state.offset + i];
-		buf += s;
-		sz -= s;
-		state.offset += s;
-		if (state.offset >= chacha::blocksize) state.offset = 0;
-	}
-	for (size_t i = 0; i < sz; i += chacha::blocksize)
-	{
-		chacha::block(state, chacha::rounds);
-		state.data[12]++;
-		for (size_t j = i; j < i + chacha::blocksize; j++)
-		{
-			if (j >= sz)
-			{
-				state.offset = j & 0x3F; // % 64
-				break;
-			}
-			buf[j] ^= state.block.data[j - i];
-		}
-	}
-}
-
-} // namespace chacha
-} // namespace crypto
-} // namespace i2p
-
-#endif

libi2pd/ChaCha20.h

@@ -1,72 +0,0 @@
-/*
-* Copyright (c) 2013-2020, The PurpleI2P Project
-*
-* This file is part of Purple i2pd project and licensed under BSD3
-*
-* See full license text in LICENSE file at top of project tree
-*
-* Kovri go write your own code
-*
-*/
-#ifndef LIBI2PD_CHACHA20_H
-#define LIBI2PD_CHACHA20_H
-#include <cstdint>
-#include <cstring>
-#include <inttypes.h>
-#include <string.h>
-#include "Crypto.h"
-
-#if !OPENSSL_AEAD_CHACHA20_POLY1305
-namespace i2p
-{
-namespace crypto
-{
-	const std::size_t CHACHA20_KEY_BYTES = 32;
-	const std::size_t CHACHA20_NOUNCE_BYTES = 12;
-
-namespace chacha
-{
-	constexpr std::size_t blocksize = 64;
-	constexpr int rounds = 20;
-
-	struct Chacha20State;
-	struct Chacha20Block
-	{
-		Chacha20Block () {};
-		Chacha20Block (Chacha20Block &&) = delete;
-
-		uint8_t data[blocksize];
-
-		void operator << (const Chacha20State & st);
-	};
-
-	struct Chacha20State
-	{
-		Chacha20State (): offset (0) {};
-		Chacha20State (Chacha20State &&) = delete;
-
-		Chacha20State & operator += (const Chacha20State & other)
-		{
-			for(int i = 0; i < 16; i++)
-				data[i] += other.data[i];
-			return *this;
-		}
-
-		void Copy(const Chacha20State & other)
-		{
-			memcpy(data, other.data, sizeof(uint32_t) * 16);
-		}
-		uint32_t data[16];
-		Chacha20Block block;
-		size_t offset;
-	};
-
-	void Chacha20Init (Chacha20State& state, const uint8_t * nonce, const uint8_t * key, uint32_t counter);
-	void Chacha20SetCounter (Chacha20State& state, uint32_t counter);
-	void Chacha20Encrypt (Chacha20State& state, uint8_t * buf, size_t sz); // encrypt buf in place
-} // namespace chacha
-} // namespace crypto
-} // namespace i2p
-
-#endif
-#endif

libi2pd/Config.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -117,9 +117,14 @@ namespace config {
 			("httpproxy.latency.max", value<std::string>()->default_value("0"),       "HTTP proxy max latency for tunnels")
 			("httpproxy.outproxy", value<std::string>()->default_value(""),           "HTTP proxy upstream out proxy url")
 			("httpproxy.addresshelper", value<bool>()->default_value(true),           "Enable or disable addresshelper")
+			("httpproxy.senduseragent", value<bool>()->default_value(false),          "Pass through user's User-Agent if enabled. Disabled by default")
 			("httpproxy.i2cp.leaseSetType", value<std::string>()->default_value("3"), "Local destination's LeaseSet type")
 			("httpproxy.i2cp.leaseSetEncType", value<std::string>()->default_value("0,4"), "Local destination's LeaseSet encryption type")
 			("httpproxy.i2cp.leaseSetPrivKey", value<std::string>()->default_value(""), "LeaseSet private key")
+			("httpproxy.i2p.streaming.maxOutboundSpeed", value<std::string>()->default_value("1730000000"), "Max outbound speed of HTTP proxy stream in bytes/sec")
+			("httpproxy.i2p.streaming.maxInboundSpeed", value<std::string>()->default_value("1730000000"), "Max inbound speed of HTTP proxy stream in bytes/sec")
+			("httpproxy.i2p.streaming.profile", value<std::string>()->default_value("1"), "HTTP Proxy bandwidth usage profile. 1 - bulk(high), 2- interactive(low)")
+
 		;
 
 		options_description socksproxy("SOCKS Proxy options");
@@ -144,8 +149,22 @@ namespace config {
 			("socksproxy.i2cp.leaseSetType", value<std::string>()->default_value("3"), "Local destination's LeaseSet type")
 			("socksproxy.i2cp.leaseSetEncType", value<std::string>()->default_value("0,4"), "Local destination's LeaseSet encryption type")
 			("socksproxy.i2cp.leaseSetPrivKey", value<std::string>()->default_value(""), "LeaseSet private key")
+			("socksproxy.i2p.streaming.maxOutboundSpeed", value<std::string>()->default_value("1730000000"), "Max outbound speed of SOCKS proxy stream in bytes/sec")
+			("socksproxy.i2p.streaming.maxInboundSpeed", value<std::string>()->default_value("1730000000"), "Max inbound speed of SOCKS proxy stream in bytes/sec")
+			("socksproxy.i2p.streaming.profile", value<std::string>()->default_value("1"), "SOCKS Proxy bandwidth usage profile. 1 - bulk(high), 2- interactive(low)")
 		;
 
+		options_description shareddest("Shared local destination options");
+		shareddest.add_options()
+			("shareddest.inbound.length", value<std::string>()->default_value("3"),    "Shared local destination inbound tunnel length")
+			("shareddest.outbound.length", value<std::string>()->default_value("3"),   "Shared local destination outbound tunnel length")
+			("shareddest.inbound.quantity", value<std::string>()->default_value("3"),  "Shared local destination inbound tunnels quantity")
+			("shareddest.outbound.quantity", value<std::string>()->default_value("3"), "Shared local destination outbound tunnels quantity")
+			("shareddest.i2cp.leaseSetType", value<std::string>()->default_value("3"), "Shared local destination's LeaseSet type")
+			("shareddest.i2cp.leaseSetEncType", value<std::string>()->default_value("0,4"), "Shared local destination's LeaseSet encryption type")
+			("shareddest.i2p.streaming.profile", value<std::string>()->default_value("2"), "Shared local destination bandwidth usage profile. 1 - bulk(high), 2- interactive(low)")
+		;	
+		
 		options_description sam("SAM bridge options");
 		sam.add_options()
 			("sam.enabled", value<bool>()->default_value(true),               "Enable or disable SAM Application bridge")
@@ -168,6 +187,8 @@ namespace config {
 			("i2cp.address", value<std::string>()->default_value("127.0.0.1"), "I2CP listen address")
 			("i2cp.port", value<uint16_t>()->default_value(7654),              "I2CP listen port")
 			("i2cp.singlethread", value<bool>()->default_value(true),          "Destinations run in the I2CP server's thread")
+			("i2cp.inboundlimit", value<uint32_t>()->default_value(0),         "Client inbound limit in KBps to return in BandwidthLimitsMessage. Router's bandwidth by default")
+			("i2cp.outboundlimit", value<uint32_t>()->default_value(0),        "Client outbound limit in KBps to return in BandwidthLimitsMessage. Router's bandwidth by default")
 		;
 
 		options_description i2pcontrol("I2PControl options");
@@ -205,7 +226,7 @@ namespace config {
 		reseed.add_options()
 			("reseed.verify", value<bool>()->default_value(false),        "Verify .su3 signature")
 			("reseed.threshold", value<uint16_t>()->default_value(25),    "Minimum number of known routers before requesting reseed")
-			("reseed.floodfill", value<std::string>()->default_value(""), "Path to router info of floodfill to reseed from")
+			("reseed.floodfill", value<std::string>()->default_value(""), "Ignored. Always empty")
 			("reseed.file", value<std::string>()->default_value(""),      "Path to local .su3 file or HTTPS URL to reseed from")
 			("reseed.zipfile", value<std::string>()->default_value(""),   "Path to local .zip file to reseed from")
 			("reseed.proxy", value<std::string>()->default_value(""),     "url for reseed proxy, supports http/socks")
@@ -217,7 +238,7 @@ namespace config {
 				"https://reseed.onion.im/,"
 				"https://i2pseed.creativecowpat.net:8443/,"
 				"https://reseed.i2pgit.org/,"
-				"https://banana.incognet.io/,"
+				"https://coconut.incognet.io/,"
 				"https://reseed-pl.i2pd.xyz/,"
 				"https://www2.mk16.de/,"
 			    "https://i2p.ghativega.in/,"
@@ -228,9 +249,7 @@ namespace config {
 				"http://[324:71e:281a:9ed3::ace]:7070/,"
 				"http://[301:65b9:c7cd:9a36::1]:18801/,"
 				"http://[320:8936:ec1a:31f1::216]/,"
-				"http://[306:3834:97b9:a00a::1]/,"
-				"http://[316:f9e0:f22e:a74f::216]/,"
-			    "http://[300:eaff:7fab:181b::e621]:7170"
+				"http://[316:f9e0:f22e:a74f::216]/"
 			),                                                            "Reseed URLs through the Yggdrasil, separated by comma")
 		;
 
@@ -307,11 +326,11 @@ namespace config {
 			("persist.addressbook", value<bool>()->default_value(true),    "Persist full addresses (default: true)")
 		;
 
-		options_description cpuext("CPU encryption extensions options");
+		options_description cpuext("CPU encryption extensions options. Deprecated");
 		cpuext.add_options()
-			("cpuext.aesni", bool_switch()->default_value(true),                     "Use auto detection for AESNI CPU extensions. If false, AESNI will be not used")
+			("cpuext.aesni", bool_switch()->default_value(true),                     "Deprecated option")
 			("cpuext.avx", bool_switch()->default_value(false),                      "Deprecated option")
-			("cpuext.force", bool_switch()->default_value(false),                    "Force usage of CPU extensions. Useful when cpuinfo is not available on virtual machines")
+			("cpuext.force", bool_switch()->default_value(false),                    "Deprecated option")
 		;
 
 		options_description meshnets("Meshnet transports options");
@@ -333,6 +352,7 @@ namespace config {
 			.add(httpserver)
 			.add(httpproxy)
 			.add(socksproxy)
+			.add(shareddest)
 			.add(sam)
 			.add(bob)
 			.add(i2cp)

libi2pd/Crypto.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2023, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -19,16 +19,12 @@
 #if OPENSSL_HKDF
 #include <openssl/kdf.h>
 #endif
-#if !OPENSSL_AEAD_CHACHA20_POLY1305
-#include "ChaCha20.h"
-#include "Poly1305.h"
-#endif
+#include "CPU.h"
 #include "Crypto.h"
 #include "Ed25519.h"
 #include "I2PEndian.h"
 #include "Log.h"
 
-
 namespace i2p
 {
 namespace crypto
@@ -245,17 +241,12 @@ namespace crypto
 // x25519
 	X25519Keys::X25519Keys ()
 	{
-#if OPENSSL_X25519
 		m_Ctx = EVP_PKEY_CTX_new_id (NID_X25519, NULL);
 		m_Pkey = nullptr;
-#else
-		m_Ctx = BN_CTX_new ();
-#endif
 	}
 
 	X25519Keys::X25519Keys (const uint8_t * priv, const uint8_t * pub)
 	{
-#if OPENSSL_X25519
 		m_Pkey = EVP_PKEY_new_raw_private_key (EVP_PKEY_X25519, NULL, priv, 32);
 		m_Ctx = EVP_PKEY_CTX_new (m_Pkey, NULL);
 		if (pub)
@@ -265,29 +256,16 @@ namespace crypto
 			size_t len = 32;
 			EVP_PKEY_get_raw_public_key (m_Pkey, m_PublicKey, &len);
 		}
-#else
-		m_Ctx = BN_CTX_new ();
-		memcpy (m_PrivateKey, priv, 32);
-		if (pub)
-			memcpy (m_PublicKey, pub, 32);
-		else
-			GetEd25519 ()->ScalarMulB (m_PrivateKey, m_PublicKey, m_Ctx);
-#endif
 	}
 
 	X25519Keys::~X25519Keys ()
 	{
-#if OPENSSL_X25519
 		EVP_PKEY_CTX_free (m_Ctx);
 		if (m_Pkey) EVP_PKEY_free (m_Pkey);
-#else
-		BN_CTX_free (m_Ctx);
-#endif
 	}
 
 	void X25519Keys::GenerateKeys ()
 	{
-#if OPENSSL_X25519
 		if (m_Pkey)
 		{
 			EVP_PKEY_free (m_Pkey);
@@ -299,16 +277,11 @@ namespace crypto
 		m_Ctx = EVP_PKEY_CTX_new (m_Pkey, NULL); // TODO: do we really need to re-create m_Ctx?
 		size_t len = 32;
 		EVP_PKEY_get_raw_public_key (m_Pkey, m_PublicKey, &len);
-#else
-		RAND_bytes (m_PrivateKey, 32);
-		GetEd25519 ()->ScalarMulB (m_PrivateKey, m_PublicKey, m_Ctx);
-#endif
 	}
 
 	bool X25519Keys::Agree (const uint8_t * pub, uint8_t * shared)
 	{
 		if (!pub || (pub[31] & 0x80)) return false; // not x25519 key
-#if OPENSSL_X25519
 		EVP_PKEY_derive_init (m_Ctx);
 		auto pkey = EVP_PKEY_new_raw_public_key (EVP_PKEY_X25519, NULL, pub, 32);
 		if (!pkey) return false;
@@ -316,25 +289,17 @@ namespace crypto
 		size_t len = 32;
 		EVP_PKEY_derive (m_Ctx, shared, &len);
 		EVP_PKEY_free (pkey);
-#else
-		GetEd25519 ()->ScalarMul (pub, m_PrivateKey, shared, m_Ctx);
-#endif
 		return true;
 	}
 
 	void X25519Keys::GetPrivateKey (uint8_t * priv) const
 	{
-#if OPENSSL_X25519
 		size_t len = 32;
 		EVP_PKEY_get_raw_private_key (m_Pkey, priv, &len);
-#else
-		memcpy (priv, m_PrivateKey, 32);
-#endif
 	}
 
 	void X25519Keys::SetPrivateKey (const uint8_t * priv, bool calculatePublic)
 	{
-#if OPENSSL_X25519
 		if (m_Ctx) EVP_PKEY_CTX_free (m_Ctx);
 		if (m_Pkey) EVP_PKEY_free (m_Pkey);
 		m_Pkey = EVP_PKEY_new_raw_private_key (EVP_PKEY_X25519, NULL, priv, 32);
@@ -344,11 +309,6 @@ namespace crypto
 			size_t len = 32;
 			EVP_PKEY_get_raw_public_key (m_Pkey, m_PublicKey, &len);
 		}
-#else
-		memcpy (m_PrivateKey, priv, 32);
-		if (calculatePublic)
-			GetEd25519 ()->ScalarMulB (m_PrivateKey, m_PublicKey, m_Ctx);
-#endif
 	}
 
 // ElGamal
@@ -482,9 +442,8 @@ namespace crypto
 		// encrypt
 		CBCEncryption encryption;
 		encryption.SetKey (shared);
-		encryption.SetIV (iv);
 		encrypted[257] = 0;
-		encryption.Encrypt (m, 256, encrypted + 258);
+		encryption.Encrypt (m, 256, iv, encrypted + 258);
 		EC_POINT_free (p);
 		BN_CTX_end (ctx);
 		BN_CTX_free (ctx);
@@ -517,8 +476,7 @@ namespace crypto
 			uint8_t m[256];
 			CBCDecryption decryption;
 			decryption.SetKey (shared);
-			decryption.SetIV (iv);
-			decryption.Decrypt (encrypted + 258, 256, m);
+			decryption.Decrypt (encrypted + 258, 256, iv, m);
 			// verify and copy
 			uint8_t hash[32];
 			SHA256 (m + 33, 222, hash);
@@ -556,441 +514,114 @@ namespace crypto
 	}
 
 // AES
-#if SUPPORTS_AES
-	#define KeyExpansion256(round0,round1) \
-		"pshufd $0xff, %%xmm2, %%xmm2 \n" \
-		"movaps %%xmm1, %%xmm4 \n" \
-		"pslldq $4, %%xmm4 \n" \
-		"pxor %%xmm4, %%xmm1 \n" \
-		"pslldq $4, %%xmm4 \n" \
-		"pxor %%xmm4, %%xmm1 \n" \
-		"pslldq $4, %%xmm4 \n" \
-		"pxor %%xmm4, %%xmm1 \n" \
-		"pxor %%xmm2, %%xmm1 \n" \
-		"movaps %%xmm1, "#round0"(%[sched]) \n" \
-		"aeskeygenassist $0, %%xmm1, %%xmm4 \n" \
-		"pshufd $0xaa, %%xmm4, %%xmm2 \n" \
-		"movaps %%xmm3, %%xmm4 \n" \
-		"pslldq $4, %%xmm4 \n" \
-		"pxor %%xmm4, %%xmm3 \n" \
-		"pslldq $4, %%xmm4 \n" \
-		"pxor %%xmm4, %%xmm3 \n" \
-		"pslldq $4, %%xmm4 \n" \
-		"pxor %%xmm4, %%xmm3 \n" \
-		"pxor %%xmm2, %%xmm3 \n" \
-		"movaps %%xmm3, "#round1"(%[sched]) \n"
-#endif
-
-#if SUPPORTS_AES
-	void ECBCryptoAESNI::ExpandKey (const AESKey& key)
+	ECBEncryption::ECBEncryption ()
 	{
-		__asm__
-		(
-			"movups (%[key]), %%xmm1 \n"
-			"movups 16(%[key]), %%xmm3 \n"
-			"movaps %%xmm1, (%[sched]) \n"
-			"movaps %%xmm3, 16(%[sched]) \n"
-			"aeskeygenassist $1, %%xmm3, %%xmm2 \n"
-			KeyExpansion256(32,48)
-			"aeskeygenassist $2, %%xmm3, %%xmm2 \n"
-			KeyExpansion256(64,80)
-			"aeskeygenassist $4, %%xmm3, %%xmm2 \n"
-			KeyExpansion256(96,112)
-			"aeskeygenassist $8, %%xmm3, %%xmm2 \n"
-			KeyExpansion256(128,144)
-			"aeskeygenassist $16, %%xmm3, %%xmm2 \n"
-			KeyExpansion256(160,176)
-			"aeskeygenassist $32, %%xmm3, %%xmm2 \n"
-			KeyExpansion256(192,208)
-			"aeskeygenassist $64, %%xmm3, %%xmm2 \n"
-			// key expansion final
-			"pshufd $0xff, %%xmm2, %%xmm2 \n"
-			"movaps %%xmm1, %%xmm4 \n"
-			"pslldq $4, %%xmm4 \n"
-			"pxor %%xmm4, %%xmm1 \n"
-			"pslldq $4, %%xmm4 \n"
-			"pxor %%xmm4, %%xmm1 \n"
-			"pslldq $4, %%xmm4 \n"
-			"pxor %%xmm4, %%xmm1 \n"
-			"pxor %%xmm2, %%xmm1 \n"
-			"movups %%xmm1, 224(%[sched]) \n"
-			: // output
-			: [key]"r"((const uint8_t *)key), [sched]"r"(GetKeySchedule ()) // input
-			: "%xmm1", "%xmm2", "%xmm3", "%xmm4", "memory" // clogged
-		);
+		m_Ctx = EVP_CIPHER_CTX_new ();
 	}
-#endif
-
-
-#if SUPPORTS_AES
-	#define EncryptAES256(sched) \
-		"pxor (%["#sched"]), %%xmm0 \n" \
-		"aesenc	16(%["#sched"]), %%xmm0 \n" \
-		"aesenc	32(%["#sched"]), %%xmm0 \n" \
-		"aesenc	48(%["#sched"]), %%xmm0 \n" \
-		"aesenc	64(%["#sched"]), %%xmm0 \n" \
-		"aesenc	80(%["#sched"]), %%xmm0 \n" \
-		"aesenc	96(%["#sched"]), %%xmm0 \n" \
-		"aesenc	112(%["#sched"]), %%xmm0 \n" \
-		"aesenc	128(%["#sched"]), %%xmm0 \n" \
-		"aesenc	144(%["#sched"]), %%xmm0 \n" \
-		"aesenc	160(%["#sched"]), %%xmm0 \n" \
-		"aesenc	176(%["#sched"]), %%xmm0 \n" \
-		"aesenc	192(%["#sched"]), %%xmm0 \n" \
-		"aesenc	208(%["#sched"]), %%xmm0 \n" \
-		"aesenclast	224(%["#sched"]), %%xmm0 \n"
-#endif
-
-	void ECBEncryption::Encrypt (const ChipherBlock * in, ChipherBlock * out)
+	
+	ECBEncryption::~ECBEncryption ()
 	{
-#if SUPPORTS_AES
-		if(i2p::cpu::aesni)
-		{
-			__asm__
-			(
-				"movups (%[in]), %%xmm0 \n"
-				EncryptAES256(sched)
-				"movups %%xmm0, (%[out]) \n"
-				:
-				: [sched]"r"(GetKeySchedule ()), [in]"r"(in), [out]"r"(out)
-				: "%xmm0", "memory"
-			);
-		}
-		else
-#endif
-		{
-			AES_encrypt (in->buf, out->buf, &m_Key);
-		}
+		if (m_Ctx)
+			EVP_CIPHER_CTX_free (m_Ctx);
+	}	
+	
+	void ECBEncryption::Encrypt (const uint8_t * in, uint8_t * out)
+	{
+		EVP_EncryptInit_ex (m_Ctx, EVP_aes_256_ecb(), NULL, m_Key, NULL);
+		EVP_CIPHER_CTX_set_padding (m_Ctx, 0);
+		int len;
+		EVP_EncryptUpdate (m_Ctx, out, &len, in, 16);
+		EVP_EncryptFinal_ex (m_Ctx, out + len, &len);
 	}
 
-#if SUPPORTS_AES
-	#define DecryptAES256(sched) \
-		"pxor 224(%["#sched"]), %%xmm0 \n" \
-		"aesdec	208(%["#sched"]), %%xmm0 \n" \
-		"aesdec	192(%["#sched"]), %%xmm0 \n" \
-		"aesdec	176(%["#sched"]), %%xmm0 \n" \
-		"aesdec	160(%["#sched"]), %%xmm0 \n" \
-		"aesdec	144(%["#sched"]), %%xmm0 \n" \
-		"aesdec	128(%["#sched"]), %%xmm0 \n" \
-		"aesdec	112(%["#sched"]), %%xmm0 \n" \
-		"aesdec	96(%["#sched"]), %%xmm0 \n" \
-		"aesdec	80(%["#sched"]), %%xmm0 \n" \
-		"aesdec	64(%["#sched"]), %%xmm0 \n" \
-		"aesdec	48(%["#sched"]), %%xmm0 \n" \
-		"aesdec	32(%["#sched"]), %%xmm0 \n" \
-		"aesdec	16(%["#sched"]), %%xmm0 \n" \
-		"aesdeclast (%["#sched"]), %%xmm0 \n"
-#endif
-
-	void ECBDecryption::Decrypt (const ChipherBlock * in, ChipherBlock * out)
+	ECBDecryption::ECBDecryption ()
 	{
-#if SUPPORTS_AES
-		if(i2p::cpu::aesni)
-		{
-			__asm__
-			(
-				"movups (%[in]), %%xmm0 \n"
-				DecryptAES256(sched)
-				"movups %%xmm0, (%[out]) \n"
-				:
-				: [sched]"r"(GetKeySchedule ()), [in]"r"(in), [out]"r"(out)
-				: "%xmm0", "memory"
-			);
-		}
-		else
-#endif
-		{
-			AES_decrypt (in->buf, out->buf, &m_Key);
-		}
+		m_Ctx = EVP_CIPHER_CTX_new ();
+	}
+	
+	ECBDecryption::~ECBDecryption ()
+	{
+		if (m_Ctx)
+			EVP_CIPHER_CTX_free (m_Ctx);
+	}	
+	
+	void ECBDecryption::Decrypt (const uint8_t * in, uint8_t * out)
+	{
+		EVP_DecryptInit_ex (m_Ctx, EVP_aes_256_ecb(), NULL, m_Key, NULL);
+		EVP_CIPHER_CTX_set_padding (m_Ctx, 0);
+		int len;
+		EVP_DecryptUpdate (m_Ctx, out, &len, in, 16);
+		EVP_DecryptFinal_ex (m_Ctx, out + len, &len);
 	}
 
-#if SUPPORTS_AES
-	#define CallAESIMC(offset) \
-		"movaps "#offset"(%[shed]), %%xmm0 \n" \
-		"aesimc %%xmm0, %%xmm0 \n" \
-		"movaps %%xmm0, "#offset"(%[shed]) \n"
-#endif
 
-	void ECBEncryption::SetKey (const AESKey& key)
-	{
-#if SUPPORTS_AES
-		if(i2p::cpu::aesni)
-		{
-			ExpandKey (key);
-		}
-		else
-#endif
-		{
-			AES_set_encrypt_key (key, 256, &m_Key);
-		}
+	CBCEncryption::CBCEncryption () 
+	{ 
+		m_Ctx = EVP_CIPHER_CTX_new ();
 	}
-
-	void ECBDecryption::SetKey (const AESKey& key)
+	
+	CBCEncryption::~CBCEncryption ()
 	{
-#if SUPPORTS_AES
-		if(i2p::cpu::aesni)
-		{
-			ExpandKey (key); // expand encryption key first
-			// then invert it using aesimc
-			__asm__
-			(
-				CallAESIMC(16)
-				CallAESIMC(32)
-				CallAESIMC(48)
-				CallAESIMC(64)
-				CallAESIMC(80)
-				CallAESIMC(96)
-				CallAESIMC(112)
-				CallAESIMC(128)
-				CallAESIMC(144)
-				CallAESIMC(160)
-				CallAESIMC(176)
-				CallAESIMC(192)
-				CallAESIMC(208)
-				:
-				: [shed]"r"(GetKeySchedule ())
-				: "%xmm0", "memory"
-			);
-		}
-		else
-#endif
-		{
-			AES_set_decrypt_key (key, 256, &m_Key);
-		}
-	}
-
-	void CBCEncryption::Encrypt (int numBlocks, const ChipherBlock * in, ChipherBlock * out)
-	{
-#if SUPPORTS_AES
-		if(i2p::cpu::aesni)
-		{
-			__asm__
-			(
-				"movups (%[iv]), %%xmm1 \n"
-				"1: \n"
-				"movups (%[in]), %%xmm0 \n"
-				"pxor %%xmm1, %%xmm0 \n"
-				EncryptAES256(sched)
-				"movaps %%xmm0, %%xmm1 \n"
-				"movups %%xmm0, (%[out]) \n"
-				"add $16, %[in] \n"
-				"add $16, %[out] \n"
-				"dec %[num] \n"
-				"jnz 1b \n"
-				"movups %%xmm1, (%[iv]) \n"
-				:
-				: [iv]"r"((uint8_t *)m_LastBlock), [sched]"r"(m_ECBEncryption.GetKeySchedule ()),
-					[in]"r"(in), [out]"r"(out), [num]"r"(numBlocks)
-				: "%xmm0", "%xmm1", "cc", "memory"
-			);
-		}
-		else
-#endif
-		{
-			for (int i = 0; i < numBlocks; i++)
-			{
-				*m_LastBlock.GetChipherBlock () ^= in[i];
-				m_ECBEncryption.Encrypt (m_LastBlock.GetChipherBlock (), m_LastBlock.GetChipherBlock ());
-				out[i] = *m_LastBlock.GetChipherBlock ();
-			}
-		}
-	}
-
-	void CBCEncryption::Encrypt (const uint8_t * in, std::size_t len, uint8_t * out)
+		if (m_Ctx)
+			EVP_CIPHER_CTX_free (m_Ctx);
+	}	
+	
+	void CBCEncryption::Encrypt (const uint8_t * in, size_t len, const uint8_t * iv, uint8_t * out)
 	{
 		// len/16
-		int numBlocks = len >> 4;
-		if (numBlocks > 0)
-			Encrypt (numBlocks, (const ChipherBlock *)in, (ChipherBlock *)out);
+		EVP_EncryptInit_ex (m_Ctx, EVP_aes_256_cbc(), NULL, m_Key, iv);
+		EVP_CIPHER_CTX_set_padding (m_Ctx, 0);
+		int l;
+		EVP_EncryptUpdate (m_Ctx, out, &l, in, len);
+		EVP_EncryptFinal_ex (m_Ctx, out + l, &l);
 	}
 
-	void CBCEncryption::Encrypt (const uint8_t * in, uint8_t * out)
-	{
-#if SUPPORTS_AES
-		if(i2p::cpu::aesni)
-		{
-			__asm__
-			(
-				"movups (%[iv]), %%xmm1 \n"
-				"movups (%[in]), %%xmm0 \n"
-				"pxor %%xmm1, %%xmm0 \n"
-				EncryptAES256(sched)
-				"movups %%xmm0, (%[out]) \n"
-				"movups %%xmm0, (%[iv]) \n"
-				:
-				: [iv]"r"((uint8_t *)m_LastBlock), [sched]"r"(m_ECBEncryption.GetKeySchedule ()),
-					[in]"r"(in), [out]"r"(out)
-				: "%xmm0", "%xmm1", "memory"
-			);
-		}
-		else
-#endif
-			Encrypt (1, (const ChipherBlock *)in, (ChipherBlock *)out);
+	CBCDecryption::CBCDecryption () 
+	{ 
+		m_Ctx = EVP_CIPHER_CTX_new ();
 	}
-
-	void CBCDecryption::Decrypt (int numBlocks, const ChipherBlock * in, ChipherBlock * out)
+	
+	CBCDecryption::~CBCDecryption ()
 	{
-#if SUPPORTS_AES
-		if(i2p::cpu::aesni)
-		{
-			__asm__
-			(
-				"movups (%[iv]), %%xmm1 \n"
-				"1: \n"
-				"movups (%[in]), %%xmm0 \n"
-				"movaps %%xmm0, %%xmm2 \n"
-				DecryptAES256(sched)
-				"pxor %%xmm1, %%xmm0 \n"
-				"movups %%xmm0, (%[out]) \n"
-				"movaps %%xmm2, %%xmm1 \n"
-				"add $16, %[in] \n"
-				"add $16, %[out] \n"
-				"dec %[num] \n"
-				"jnz 1b \n"
-				"movups %%xmm1, (%[iv]) \n"
-				:
-				: [iv]"r"((uint8_t *)m_IV), [sched]"r"(m_ECBDecryption.GetKeySchedule ()),
-					[in]"r"(in), [out]"r"(out), [num]"r"(numBlocks)
-				: "%xmm0", "%xmm1", "%xmm2", "cc", "memory"
-			);
-		}
-		else
-#endif
-		{
-			for (int i = 0; i < numBlocks; i++)
-			{
-				ChipherBlock tmp = in[i];
-				m_ECBDecryption.Decrypt (in + i, out + i);
-				out[i] ^= *m_IV.GetChipherBlock ();
-				*m_IV.GetChipherBlock () = tmp;
-			}
-		}
-	}
-
-	void CBCDecryption::Decrypt (const uint8_t * in, std::size_t len, uint8_t * out)
+		if (m_Ctx)
+			EVP_CIPHER_CTX_free (m_Ctx);
+	}	
+	
+	void CBCDecryption::Decrypt (const uint8_t * in, size_t len, const uint8_t * iv, uint8_t * out)
 	{
-		int numBlocks = len >> 4;
-		if (numBlocks > 0)
-			Decrypt (numBlocks, (const ChipherBlock *)in, (ChipherBlock *)out);
-	}
-
-	void CBCDecryption::Decrypt (const uint8_t * in, uint8_t * out)
-	{
-#if SUPPORTS_AES
-		if(i2p::cpu::aesni)
-		{
-			__asm__
-			(
-				"movups (%[iv]), %%xmm1 \n"
-				"movups (%[in]), %%xmm0 \n"
-				"movups %%xmm0, (%[iv]) \n"
-				DecryptAES256(sched)
-				"pxor %%xmm1, %%xmm0 \n"
-				"movups %%xmm0, (%[out]) \n"
-				:
-				: [iv]"r"((uint8_t *)m_IV), [sched]"r"(m_ECBDecryption.GetKeySchedule ()),
-					[in]"r"(in), [out]"r"(out)
-				: "%xmm0", "%xmm1", "memory"
-			);
-		}
-		else
-#endif
-			Decrypt (1, (const ChipherBlock *)in, (ChipherBlock *)out);
+		// len/16
+		EVP_DecryptInit_ex (m_Ctx, EVP_aes_256_cbc(), NULL, m_Key, iv);
+		EVP_CIPHER_CTX_set_padding (m_Ctx, 0);
+		int l;
+		EVP_DecryptUpdate (m_Ctx, out, &l, in, len);
+		EVP_DecryptFinal_ex (m_Ctx, out + l, &l);
 	}
 
 	void TunnelEncryption::Encrypt (const uint8_t * in, uint8_t * out)
 	{
-#if SUPPORTS_AES
-		if(i2p::cpu::aesni)
-		{
-			__asm__
-			(
-				// encrypt IV
-				"movups (%[in]), %%xmm0 \n"
-				EncryptAES256(sched_iv)
-				"movaps %%xmm0, %%xmm1 \n"
-				// double IV encryption
-				EncryptAES256(sched_iv)
-				"movups %%xmm0, (%[out]) \n"
-				// encrypt data, IV is xmm1
-				"1: \n"
-				"add $16, %[in] \n"
-				"add $16, %[out] \n"
-				"movups (%[in]), %%xmm0 \n"
-				"pxor %%xmm1, %%xmm0 \n"
-				EncryptAES256(sched_l)
-				"movaps %%xmm0, %%xmm1 \n"
-				"movups %%xmm0, (%[out]) \n"
-				"dec %[num] \n"
-				"jnz 1b \n"
-				:
-				: [sched_iv]"r"(m_IVEncryption.GetKeySchedule ()), [sched_l]"r"(m_LayerEncryption.ECB().GetKeySchedule ()),
-					[in]"r"(in), [out]"r"(out), [num]"r"(63) // 63 blocks = 1008 bytes
-				: "%xmm0", "%xmm1", "cc", "memory"
-			);
-		}
-		else
-#endif
-		{
-			m_IVEncryption.Encrypt ((const ChipherBlock *)in, (ChipherBlock *)out); // iv
-			m_LayerEncryption.SetIV (out);
-			m_LayerEncryption.Encrypt (in + 16, i2p::tunnel::TUNNEL_DATA_ENCRYPTED_SIZE, out + 16); // data
-			m_IVEncryption.Encrypt ((ChipherBlock *)out, (ChipherBlock *)out); // double iv
-		}
+		uint8_t iv[16];
+		m_IVEncryption.Encrypt (in, iv); // iv
+		m_LayerEncryption.Encrypt (in + 16, i2p::tunnel::TUNNEL_DATA_ENCRYPTED_SIZE, iv, out + 16); // data
+		m_IVEncryption.Encrypt (iv, out); // double iv
 	}
 
 	void TunnelDecryption::Decrypt (const uint8_t * in, uint8_t * out)
 	{
-#if SUPPORTS_AES
-		if(i2p::cpu::aesni)
-		{
-			__asm__
-			(
-				// decrypt IV
-				"movups	(%[in]), %%xmm0 \n"
-				DecryptAES256(sched_iv)
-				"movaps %%xmm0, %%xmm1 \n"
-				// double IV encryption
-				DecryptAES256(sched_iv)
-				"movups %%xmm0, (%[out]) \n"
-				// decrypt data, IV is xmm1
-				"1: \n"
-				"add $16, %[in] \n"
-				"add $16, %[out] \n"
-				"movups (%[in]), %%xmm0 \n"
-				"movaps %%xmm0, %%xmm2 \n"
-				DecryptAES256(sched_l)
-				"pxor %%xmm1, %%xmm0 \n"
-				"movups %%xmm0, (%[out]) \n"
-				"movaps %%xmm2, %%xmm1 \n"
-				"dec %[num] \n"
-				"jnz 1b \n"
-				:
-				: [sched_iv]"r"(m_IVDecryption.GetKeySchedule ()), [sched_l]"r"(m_LayerDecryption.ECB().GetKeySchedule ()),
-					[in]"r"(in), [out]"r"(out), [num]"r"(63) // 63 blocks = 1008 bytes
-				: "%xmm0", "%xmm1", "%xmm2", "cc", "memory"
-			);
-		}
-		else
-#endif
-		{
-			m_IVDecryption.Decrypt ((const ChipherBlock *)in, (ChipherBlock *)out); // iv
-			m_LayerDecryption.SetIV (out);
-			m_LayerDecryption.Decrypt (in + 16, i2p::tunnel::TUNNEL_DATA_ENCRYPTED_SIZE, out + 16); // data
-			m_IVDecryption.Decrypt ((ChipherBlock *)out, (ChipherBlock *)out); // double iv
-		}
+		uint8_t iv[16];
+		m_IVDecryption.Decrypt (in, iv); // iv
+		m_LayerDecryption.Decrypt (in + 16, i2p::tunnel::TUNNEL_DATA_ENCRYPTED_SIZE, iv, out + 16); // data
+		m_IVDecryption.Decrypt (iv, out); // double iv
 	}
 
 // AEAD/ChaCha20/Poly1305
 
-	bool AEADChaCha20Poly1305 (const uint8_t * msg, size_t msgLen, const uint8_t * ad, size_t adLen, const uint8_t * key, const uint8_t * nonce, uint8_t * buf, size_t len, bool encrypt)
+	static bool AEADChaCha20Poly1305 (EVP_CIPHER_CTX * ctx, const uint8_t * msg, size_t msgLen, 
+		const uint8_t * ad, size_t adLen, const uint8_t * key, const uint8_t * nonce, uint8_t * buf, size_t len, bool encrypt)
 	{
-		if (len < msgLen) return false;
+		if (!ctx || len < msgLen) return false;
 		if (encrypt && len < msgLen + 16) return false;
 		bool ret = true;
-#if OPENSSL_AEAD_CHACHA20_POLY1305
 		int outlen = 0;
-		EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new ();
 		if (encrypt)
 		{
 			EVP_EncryptInit_ex(ctx, EVP_chacha20_poly1305(), 0, 0, 0);
@@ -1003,6 +634,15 @@ namespace crypto
 		}
 		else
 		{
+#if defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x4000000fL
+			std::vector<uint8_t> m(msgLen + 16);
+			if (msg == buf)
+			{	
+				// we have to use different buffers otherwise verification fails
+				memcpy (m.data (), msg, msgLen + 16);
+				msg = m.data ();
+			}	
+#endif			
 			EVP_DecryptInit_ex(ctx, EVP_chacha20_poly1305(), 0, 0, 0);
 			EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_IVLEN, 12, 0);
 			EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_TAG, 16, (uint8_t *)(msg + msgLen));
@@ -1011,140 +651,100 @@ namespace crypto
 			EVP_DecryptUpdate(ctx, buf, &outlen, msg, msgLen);
 			ret = EVP_DecryptFinal_ex(ctx, buf + outlen, &outlen) > 0;
 		}
-
-		EVP_CIPHER_CTX_free (ctx);
-#else
-		chacha::Chacha20State state;
-		// generate one time poly key
-		chacha::Chacha20Init (state, nonce, key, 0);
-		uint64_t polyKey[8];
-		memset(polyKey, 0, sizeof(polyKey));
-		chacha::Chacha20Encrypt (state, (uint8_t *)polyKey, 64);
-		// create Poly1305 hash
-		Poly1305 polyHash (polyKey);
-		if (!ad) adLen = 0;
-		uint8_t padding[16]; memset (padding, 0, 16);
-		if (ad)
-		{
-			polyHash.Update (ad, adLen);// additional authenticated data
-			auto rem = adLen & 0x0F; // %16
-			if (rem)
-			{
-				// padding1
-				rem = 16 - rem;
-				polyHash.Update (padding, rem);
-			}
-		}
-		// encrypt/decrypt data and add to hash
-		Chacha20SetCounter (state, 1);
-		if (buf != msg)
-			memcpy (buf, msg, msgLen);
-		if (encrypt)
-		{
-			chacha::Chacha20Encrypt (state, buf, msgLen); // encrypt
-			polyHash.Update (buf, msgLen); // after encryption
-		}
-		else
-		{
-			polyHash.Update (buf, msgLen); // before decryption
-			chacha::Chacha20Encrypt (state, buf, msgLen); // decrypt
-		}
-
-		auto rem = msgLen & 0x0F; // %16
-		if (rem)
-		{
-			// padding2
-			rem = 16 - rem;
-			polyHash.Update (padding, rem);
-		}
-		// adLen and msgLen
-		htole64buf (padding, adLen);
-		htole64buf (padding + 8, msgLen);
-		polyHash.Update (padding, 16);
-
-		if (encrypt)
-			// calculate Poly1305 tag and write in after encrypted data
-			polyHash.Finish ((uint64_t *)(buf + msgLen));
-		else
-		{
-			uint64_t tag[4];
-			// calculate Poly1305 tag
-			polyHash.Finish (tag);
-			if (memcmp (tag, msg + msgLen, 16)) ret = false; // compare with provided
-		}
-#endif
 		return ret;
 	}
 
-	void AEADChaCha20Poly1305Encrypt (const std::vector<std::pair<uint8_t *, size_t> >& bufs, const uint8_t * key, const uint8_t * nonce, uint8_t * mac)
+	bool AEADChaCha20Poly1305 (const uint8_t * msg, size_t msgLen, const uint8_t * ad, size_t adLen, 
+		const uint8_t * key, const uint8_t * nonce, uint8_t * buf, size_t len, bool encrypt)
 	{
-		if (bufs.empty ()) return;
-#if OPENSSL_AEAD_CHACHA20_POLY1305
-		int outlen = 0;
-		EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new ();
-		EVP_EncryptInit_ex(ctx, EVP_chacha20_poly1305(), 0, 0, 0);
-		EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_IVLEN, 12, 0);
-		EVP_EncryptInit_ex(ctx, NULL, NULL, key, nonce);
-		for (const auto& it: bufs)
-			EVP_EncryptUpdate(ctx, it.first, &outlen, it.first, it.second);
-		EVP_EncryptFinal_ex(ctx, NULL, &outlen);
-		EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_GET_TAG, 16, mac);
+		EVP_CIPHER_CTX * ctx = EVP_CIPHER_CTX_new ();
+		auto ret = AEADChaCha20Poly1305 (ctx, msg, msgLen, ad, adLen, key, nonce, buf, len, encrypt);
 		EVP_CIPHER_CTX_free (ctx);
-#else
-		chacha::Chacha20State state;
-		// generate one time poly key
-		chacha::Chacha20Init (state, nonce, key, 0);
-		uint64_t polyKey[8];
-		memset(polyKey, 0, sizeof(polyKey));
-		chacha::Chacha20Encrypt (state, (uint8_t *)polyKey, 64);
-		Poly1305 polyHash (polyKey);
-		// encrypt buffers
-		Chacha20SetCounter (state, 1);
-		size_t size = 0;
-		for (const auto& it: bufs)
-		{
-			chacha::Chacha20Encrypt (state, it.first, it.second);
-			polyHash.Update (it.first, it.second); // after encryption
-			size += it.second;
-		}
-		// padding
-		uint8_t padding[16];
-		memset (padding, 0, 16);
-		auto rem = size & 0x0F; // %16
-		if (rem)
-		{
-			// padding2
-			rem = 16 - rem;
-			polyHash.Update (padding, rem);
-		}
-		// adLen and msgLen
-		// adLen is always zero
-		htole64buf (padding + 8, size);
-		polyHash.Update (padding, 16);
-		// MAC
-		polyHash.Finish ((uint64_t *)mac);
-#endif
+		return ret;
 	}
 
-	void ChaCha20 (const uint8_t * msg, size_t msgLen, const uint8_t * key, const uint8_t * nonce, uint8_t * out)
+	AEADChaCha20Poly1305Encryptor::AEADChaCha20Poly1305Encryptor ()
+	{
+		m_Ctx = EVP_CIPHER_CTX_new ();
+	}
+	
+	AEADChaCha20Poly1305Encryptor::~AEADChaCha20Poly1305Encryptor ()
+	{
+		if (m_Ctx)
+			EVP_CIPHER_CTX_free (m_Ctx);
+	}	
+
+	bool AEADChaCha20Poly1305Encryptor::Encrypt (const uint8_t * msg, size_t msgLen, const uint8_t * ad, size_t adLen,
+		const uint8_t * key, const uint8_t * nonce, uint8_t * buf, size_t len)
+	{
+		return AEADChaCha20Poly1305 (m_Ctx, msg, msgLen, ad, adLen, key, nonce, buf, len, true);
+	}	
+
+	void AEADChaCha20Poly1305Encryptor::Encrypt (const std::vector<std::pair<uint8_t *, size_t> >& bufs, 
+		const uint8_t * key, const uint8_t * nonce, uint8_t * mac)
+	{
+		if (bufs.empty ()) return;
+		int outlen = 0;
+		EVP_EncryptInit_ex(m_Ctx, EVP_chacha20_poly1305(), 0, 0, 0);
+		EVP_CIPHER_CTX_ctrl(m_Ctx, EVP_CTRL_AEAD_SET_IVLEN, 12, 0);
+		EVP_EncryptInit_ex(m_Ctx, NULL, NULL, key, nonce);
+		for (const auto& it: bufs)
+			EVP_EncryptUpdate(m_Ctx, it.first, &outlen, it.first, it.second);
+		EVP_EncryptFinal_ex(m_Ctx, NULL, &outlen);
+		EVP_CIPHER_CTX_ctrl(m_Ctx, EVP_CTRL_AEAD_GET_TAG, 16, mac);
+	}	
+	
+	AEADChaCha20Poly1305Decryptor::AEADChaCha20Poly1305Decryptor ()
+	{
+		m_Ctx = EVP_CIPHER_CTX_new ();
+	}
+	
+	AEADChaCha20Poly1305Decryptor::~AEADChaCha20Poly1305Decryptor ()
+	{
+		if (m_Ctx)
+			EVP_CIPHER_CTX_free (m_Ctx);
+	}	
+
+	bool AEADChaCha20Poly1305Decryptor::Decrypt (const uint8_t * msg, size_t msgLen, const uint8_t * ad, size_t adLen,
+		const uint8_t * key, const uint8_t * nonce, uint8_t * buf, size_t len)
+	{
+		return AEADChaCha20Poly1305 (m_Ctx, msg, msgLen, ad, adLen, key, nonce, buf, len, false);
+	}
+
+	static void ChaCha20 (EVP_CIPHER_CTX *ctx, const uint8_t * msg, size_t msgLen, const uint8_t * key, const uint8_t * nonce, uint8_t * out)
 	{
-#if OPENSSL_AEAD_CHACHA20_POLY1305
-		EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new ();
 		uint32_t iv[4];
 		iv[0] = htole32 (1); memcpy (iv + 1, nonce, 12); // counter | nonce
 		EVP_EncryptInit_ex(ctx, EVP_chacha20 (), NULL, key, (const uint8_t *)iv);
 		int outlen = 0;
 		EVP_EncryptUpdate(ctx, out, &outlen, msg, msgLen);
 		EVP_EncryptFinal_ex(ctx, NULL, &outlen);
+	}
+	
+	void ChaCha20 (const uint8_t * msg, size_t msgLen, const uint8_t * key, const uint8_t * nonce, uint8_t * out)
+	{
+		EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new ();
+		ChaCha20 (ctx, msg, msgLen, key, nonce, out);
 		EVP_CIPHER_CTX_free (ctx);
-#else
-		chacha::Chacha20State state;
-		chacha::Chacha20Init (state, nonce, key, 1);
-		if (out != msg) memcpy (out, msg, msgLen);
-		chacha::Chacha20Encrypt (state, out, msgLen);
-#endif
 	}
 
+	
+	ChaCha20Context::ChaCha20Context ()
+	{
+		m_Ctx = EVP_CIPHER_CTX_new ();
+	}
+	
+	ChaCha20Context::~ChaCha20Context ()
+	{
+		if (m_Ctx)
+			EVP_CIPHER_CTX_free (m_Ctx);
+	}
+	
+	void ChaCha20Context::operator ()(const uint8_t * msg, size_t msgLen, const uint8_t * key, const uint8_t * nonce, uint8_t * out)
+	{
+		ChaCha20 (m_Ctx, msg, msgLen, key, nonce, out);
+	}	
+	
 	void HKDF (const uint8_t * salt, const uint8_t * key, size_t keyLen, const std::string& info,
 		uint8_t * out, size_t outLen)
 	{
@@ -1292,12 +892,8 @@ namespace crypto
 		}
 	}*/
 
-	void InitCrypto (bool precomputation, bool aesni, bool force)
+	void InitCrypto (bool precomputation)
 	{
-		i2p::cpu::Detect (aesni, force);
-#if LEGACY_OPENSSL
-		SSL_library_init ();
-#endif
 /*		auto numLocks = CRYPTO_num_locks();
 		for (int i = 0; i < numLocks; i++)
 			m_OpenSSLMutexes.emplace_back (new std::mutex);

libi2pd/Crypto.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2023, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -21,32 +21,17 @@
 #include <openssl/sha.h>
 #include <openssl/evp.h>
 #include <openssl/rand.h>
-#include <openssl/engine.h>
 #include <openssl/opensslv.h>
 
 #include "Base.h"
 #include "Tag.h"
-#include "CPU.h"
 
 // recognize openssl version and features
-#if (defined(LIBRESSL_VERSION_NUMBER) && (LIBRESSL_VERSION_NUMBER >= 0x3050200fL)) // LibreSSL 3.5.2 and above
-#	define LEGACY_OPENSSL 0
-#elif ((OPENSSL_VERSION_NUMBER < 0x010100000) || defined(LIBRESSL_VERSION_NUMBER)) // 1.0.2 and below or LibreSSL
-#	define LEGACY_OPENSSL 1
-#	define X509_getm_notBefore X509_get_notBefore
-#	define X509_getm_notAfter X509_get_notAfter
-#else
-#	define LEGACY_OPENSSL 0
-#	if (OPENSSL_VERSION_NUMBER >= 0x010101000) // 1.1.1
-#		define OPENSSL_HKDF 1
-#		define OPENSSL_EDDSA 1
-#		define OPENSSL_X25519 1
-#		if (OPENSSL_VERSION_NUMBER != 0x030000000) // 3.0.0, regression in SipHash
-#			define OPENSSL_SIPHASH 1
-#		endif
-#	endif
-#	if !defined OPENSSL_NO_CHACHA && !defined OPENSSL_NO_POLY1305 // some builds might not include them
-#		define OPENSSL_AEAD_CHACHA20_POLY1305 1
+#if (OPENSSL_VERSION_NUMBER >= 0x010101000) // 1.1.1
+#	define OPENSSL_HKDF 1
+#	define OPENSSL_EDDSA 1
+#	if (!defined(LIBRESSL_VERSION_NUMBER) && (OPENSSL_VERSION_NUMBER != 0x030000000)) // 3.0.0, regression in SipHash, not implemented in LibreSSL
+#		define OPENSSL_SIPHASH 1
 #	endif
 #endif
 
@@ -83,13 +68,8 @@ namespace crypto
 		private:
 
 			uint8_t m_PublicKey[32];
-#if OPENSSL_X25519
 			EVP_PKEY_CTX * m_Ctx;
 			EVP_PKEY * m_Pkey;
-#else
-			BN_CTX * m_Ctx;
-			uint8_t m_PrivateKey[32];
-#endif
 			bool m_IsElligatorIneligible = false; // true if definitely ineligible
 	};
 
@@ -104,142 +84,70 @@ namespace crypto
 	void GenerateECIESKeyPair (const EC_GROUP * curve, BIGNUM *& priv, EC_POINT *& pub);
 
 	// AES
-	struct ChipherBlock
-	{
-		uint8_t buf[16];
-
-		void operator^=(const ChipherBlock& other) // XOR
-		{
-			if (!(((size_t)buf | (size_t)other.buf) & 0x03)) // multiple of 4 ?
-			{
-				for (int i = 0; i < 4; i++)
-					reinterpret_cast<uint32_t *>(buf)[i] ^= reinterpret_cast<const uint32_t *>(other.buf)[i];
-			}
-			else
-			{
-				for (int i = 0; i < 16; i++)
-					buf[i] ^= other.buf[i];
-			}
-		}
-	};
-
 	typedef i2p::data::Tag<32> AESKey;
-
-	template<size_t sz>
-	class AESAlignedBuffer // 16 bytes alignment
-	{
-		public:
-
-			AESAlignedBuffer ()
-			{
-				m_Buf = m_UnalignedBuffer;
-				uint8_t rem = ((size_t)m_Buf) & 0x0f;
-				if (rem)
-					m_Buf += (16 - rem);
-			}
-
-			operator uint8_t * () { return m_Buf; };
-			operator const uint8_t * () const { return m_Buf; };
-			ChipherBlock * GetChipherBlock () { return (ChipherBlock *)m_Buf; };
-			const ChipherBlock * GetChipherBlock () const { return (const ChipherBlock *)m_Buf; };
-
-		private:
-
-			uint8_t m_UnalignedBuffer[sz + 15]; // up to 15 bytes alignment
-			uint8_t * m_Buf;
-	};
-
-
-#if SUPPORTS_AES
-	class ECBCryptoAESNI
-	{
-		public:
-
-			uint8_t * GetKeySchedule () { return m_KeySchedule; };
-
-		protected:
-
-			void ExpandKey (const AESKey& key);
-
-		private:
-
-			AESAlignedBuffer<240> m_KeySchedule;	// 14 rounds for AES-256, 240 bytes
-	};
-#endif
-
-#if SUPPORTS_AES
-	class ECBEncryption: public ECBCryptoAESNI
-#else
+	
 	class ECBEncryption
-#endif
 	{
 		public:
 
-		void SetKey (const AESKey& key);
+			ECBEncryption ();
+			~ECBEncryption ();
+			
+			void SetKey (const uint8_t * key) { m_Key = key; };
+			void Encrypt(const uint8_t * in, uint8_t * out);
 
-		void Encrypt(const ChipherBlock * in, ChipherBlock * out);
+		private:
 
-	private:
-		AES_KEY m_Key;
+			AESKey m_Key;
+			EVP_CIPHER_CTX * m_Ctx;	
 	};
 
-#if SUPPORTS_AES
-	class ECBDecryption: public ECBCryptoAESNI
-#else
 	class ECBDecryption
-#endif
 	{
 		public:
 
-			void SetKey (const AESKey& key);
-			void Decrypt (const ChipherBlock * in, ChipherBlock * out);
+			ECBDecryption ();
+			~ECBDecryption ();
+			
+			void SetKey (const uint8_t * key) { m_Key = key; };
+			void Decrypt (const uint8_t * in, uint8_t * out);
+			
 		private:
-			AES_KEY m_Key;
+			
+			AESKey m_Key;
+			EVP_CIPHER_CTX * m_Ctx;	
 	};
 
 	class CBCEncryption
 	{
 		public:
 
-			CBCEncryption () { memset ((uint8_t *)m_LastBlock, 0, 16); };
-
-			void SetKey (const AESKey& key) { m_ECBEncryption.SetKey (key); }; // 32 bytes
-			void SetIV (const uint8_t * iv) { memcpy ((uint8_t *)m_LastBlock, iv, 16); }; // 16 bytes
-			void GetIV (uint8_t * iv) const { memcpy (iv, (const uint8_t *)m_LastBlock, 16); };
-
-			void Encrypt (int numBlocks, const ChipherBlock * in, ChipherBlock * out);
-			void Encrypt (const uint8_t * in, std::size_t len, uint8_t * out);
-			void Encrypt (const uint8_t * in, uint8_t * out); // one block
-
-			ECBEncryption & ECB() { return m_ECBEncryption; }
+			CBCEncryption ();
+			~CBCEncryption ();
 
+			void SetKey (const uint8_t * key) { m_Key = key; }; // 32 bytes		
+			void Encrypt (const uint8_t * in, size_t len, const uint8_t * iv, uint8_t * out);
+			
 		private:
 
-			AESAlignedBuffer<16> m_LastBlock;
-
-			ECBEncryption m_ECBEncryption;
+			AESKey m_Key;
+			EVP_CIPHER_CTX * m_Ctx;	
 	};
 
 	class CBCDecryption
 	{
 		public:
 
-			CBCDecryption () { memset ((uint8_t *)m_IV, 0, 16); };
-
-			void SetKey (const AESKey& key) { m_ECBDecryption.SetKey (key); }; // 32 bytes
-			void SetIV (const uint8_t * iv) { memcpy ((uint8_t *)m_IV, iv, 16); }; // 16 bytes
-			void GetIV (uint8_t * iv) const { memcpy (iv, (const uint8_t *)m_IV, 16); };
-
-			void Decrypt (int numBlocks, const ChipherBlock * in, ChipherBlock * out);
-			void Decrypt (const uint8_t * in, std::size_t len, uint8_t * out);
-			void Decrypt (const uint8_t * in, uint8_t * out); // one block
-
-			ECBDecryption & ECB() { return m_ECBDecryption; }
+			CBCDecryption ();
+			~CBCDecryption ();
+			
+			void SetKey (const uint8_t * key) { m_Key = key; }; // 32 bytes
+			void Decrypt (const uint8_t * in, size_t len, const uint8_t * iv, uint8_t * out);
 
 		private:
 
-			AESAlignedBuffer<16> m_IV;
-			ECBDecryption m_ECBDecryption;
+			AESKey m_Key;
+			EVP_CIPHER_CTX * m_Ctx;	
 	};
 
 	class TunnelEncryption // with double IV encryption
@@ -279,13 +187,58 @@ namespace crypto
 	};
 
 // AEAD/ChaCha20/Poly1305
-	bool AEADChaCha20Poly1305 (const uint8_t * msg, size_t msgLen, const uint8_t * ad, size_t adLen, const uint8_t * key, const uint8_t * nonce, uint8_t * buf, size_t len, bool encrypt); // msgLen is len without tag
 
-	void AEADChaCha20Poly1305Encrypt (const std::vector<std::pair<uint8_t *, size_t> >& bufs, const uint8_t * key, const uint8_t * nonce, uint8_t * mac); // encrypt multiple buffers with zero ad
+	class AEADChaCha20Poly1305Encryptor
+	{
+		public:
 
+			AEADChaCha20Poly1305Encryptor ();
+			~AEADChaCha20Poly1305Encryptor ();
+
+			bool Encrypt (const uint8_t * msg, size_t msgLen, const uint8_t * ad, size_t adLen,
+				const uint8_t * key, const uint8_t * nonce, uint8_t * buf, size_t len); // msgLen is len without tag
+
+			void Encrypt (const std::vector<std::pair<uint8_t *, size_t> >& bufs, const uint8_t * key, const uint8_t * nonce, uint8_t * mac); // encrypt multiple buffers with zero ad
+			
+		private:
+
+			EVP_CIPHER_CTX * m_Ctx;	
+	};	
+
+	class AEADChaCha20Poly1305Decryptor
+	{
+		public:
+
+			AEADChaCha20Poly1305Decryptor ();
+			~AEADChaCha20Poly1305Decryptor ();
+
+			bool Decrypt (const uint8_t * msg, size_t msgLen, const uint8_t * ad, size_t adLen,
+				const uint8_t * key, const uint8_t * nonce, uint8_t * buf, size_t len); // msgLen is len without tag
+			
+		private:
+
+			EVP_CIPHER_CTX * m_Ctx;	
+	};	
+	
+	bool AEADChaCha20Poly1305 (const uint8_t * msg, size_t msgLen, const uint8_t * ad, size_t adLen,
+		const uint8_t * key, const uint8_t * nonce, uint8_t * buf, size_t len, bool encrypt); // msgLen is len without tag
+	
 // ChaCha20
 	void ChaCha20 (const uint8_t * msg, size_t msgLen, const uint8_t * key, const uint8_t * nonce, uint8_t * out);
 
+	class ChaCha20Context
+	{
+		public:
+
+			ChaCha20Context ();
+			~ChaCha20Context ();
+			void operator ()(const uint8_t * msg, size_t msgLen, const uint8_t * key, const uint8_t * nonce, uint8_t * out);
+			
+		private:
+
+			EVP_CIPHER_CTX * m_Ctx;	
+	};
+	
 // HKDF
 
 	void HKDF (const uint8_t * salt, const uint8_t * key, size_t keyLen, const std::string& info, uint8_t * out, size_t outLen = 64); // salt - 32, out - 32 or 64, info <= 32
@@ -307,84 +260,9 @@ namespace crypto
 	void InitNoiseIKState (NoiseSymmetricState& state, const uint8_t * pub); // Noise_IK (ratchets)
 
 // init and terminate
-	void InitCrypto (bool precomputation, bool aesni, bool force);
+	void InitCrypto (bool precomputation);
 	void TerminateCrypto ();
 }
 }
 
-// take care about openssl below 1.1.0
-#if LEGACY_OPENSSL
-// define getters and setters introduced in 1.1.0
-inline int DSA_set0_pqg(DSA *d, BIGNUM *p, BIGNUM *q, BIGNUM *g)
-	{
-		if (d->p) BN_free (d->p);
-		if (d->q) BN_free (d->q);
-		if (d->g) BN_free (d->g);
-		d->p = p; d->q = q; d->g = g; return 1;
-	}
-inline int DSA_set0_key(DSA *d, BIGNUM *pub_key, BIGNUM *priv_key)
-	{
-		if (d->pub_key) BN_free (d->pub_key);
-		if (d->priv_key) BN_free (d->priv_key);
-		d->pub_key = pub_key; d->priv_key = priv_key; return 1;
-	}
-inline void DSA_get0_key(const DSA *d, const BIGNUM **pub_key, const BIGNUM **priv_key)
-	{ *pub_key = d->pub_key; *priv_key = d->priv_key; }
-inline int DSA_SIG_set0(DSA_SIG *sig, BIGNUM *r, BIGNUM *s)
-	{
-		if (sig->r) BN_free (sig->r);
-		if (sig->s) BN_free (sig->s);
-		sig->r = r; sig->s = s; return 1;
-	}
-inline void DSA_SIG_get0(const DSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps)
-	{ *pr = sig->r; *ps = sig->s; }
-
-inline int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s)
-	{
-		if (sig->r) BN_free (sig->r);
-		if (sig->s) BN_free (sig->s);
-		sig->r = r; sig->s = s; return 1;
-	}
-inline void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps)
-	{ *pr = sig->r; *ps = sig->s; }
-
-inline int RSA_set0_key(RSA *r, BIGNUM *n, BIGNUM *e, BIGNUM *d)
-	{
-		if (r->n) BN_free (r->n);
-		if (r->e) BN_free (r->e);
-		if (r->d) BN_free (r->d);
-		r->n = n; r->e = e; r->d = d; return 1;
-	}
-inline void RSA_get0_key(const RSA *r, const BIGNUM **n, const BIGNUM **e, const BIGNUM **d)
-	{ *n = r->n; *e = r->e; *d = r->d; }
-
-inline int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g)
-	{
-		if (dh->p) BN_free (dh->p);
-		if (dh->q) BN_free (dh->q);
-		if (dh->g) BN_free (dh->g);
-		dh->p = p; dh->q = q; dh->g = g; return 1;
-	}
-inline int DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key)
-	{
-		if (dh->pub_key) BN_free (dh->pub_key);
-		if (dh->priv_key) BN_free (dh->priv_key);
-		dh->pub_key = pub_key; dh->priv_key = priv_key; return 1;
-	}
-inline void DH_get0_key(const DH *dh, const BIGNUM **pub_key, const BIGNUM **priv_key)
-	{ *pub_key = dh->pub_key; *priv_key = dh->priv_key; }
-
-inline RSA *EVP_PKEY_get0_RSA(EVP_PKEY *pkey)
-	{ return pkey->pkey.rsa; }
-
-inline EVP_MD_CTX *EVP_MD_CTX_new ()
-	{ return EVP_MD_CTX_create(); }
-inline void EVP_MD_CTX_free (EVP_MD_CTX *ctx)
-	{ EVP_MD_CTX_destroy (ctx); }
-
-// ssl
-#define TLS_method TLSv1_method
-
-#endif
-
 #endif

libi2pd/Datagram.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -104,8 +104,7 @@ namespace datagram
 
 		if (verified)
 		{
-			auto h = identity.GetIdentHash();
-			auto session = ObtainSession(h);
+			auto session = ObtainSession (identity.GetIdentHash());
 			session->Ack();
 			auto r = FindReceiver(toPort);
 			if(r)
@@ -288,8 +287,8 @@ namespace datagram
 
 	DatagramSession::DatagramSession(std::shared_ptr<i2p::client::ClientDestination> localDestination,
 		const i2p::data::IdentHash & remoteIdent) :
-		m_LocalDestination(localDestination),
-		m_RemoteIdent(remoteIdent),
+		m_LocalDestination(localDestination), m_RemoteIdent(remoteIdent),
+		m_LastUse (0), m_LastFlush (0),
 		m_RequestingLS(false)
 	{
 	}
@@ -310,8 +309,12 @@ namespace datagram
 		if (msg || m_SendQueue.empty ())
 			m_SendQueue.push_back(msg);
 		// flush queue right away if full
-		if (!msg || m_SendQueue.size() >= DATAGRAM_SEND_QUEUE_MAX_SIZE)
+		if (!msg || m_SendQueue.size() >= DATAGRAM_SEND_QUEUE_MAX_SIZE || 
+		    m_LastUse > m_LastFlush + DATAGRAM_MAX_FLUSH_INTERVAL)
+		{	
 			FlushSendQueue();
+			m_LastFlush =  m_LastUse;
+		}
 	}
 
 	DatagramSession::Info DatagramSession::GetSessionInfo() const
@@ -344,7 +347,7 @@ namespace datagram
 		if(path)
 			path->updateTime = i2p::util::GetSecondsSinceEpoch ();
 		if (IsRatchets ())
-			SendMsg (nullptr); // send empty message in case if we have some data to send
+			SendMsg (nullptr); // send empty message in case if we don't have some data to send
 	}
 
 	std::shared_ptr<i2p::garlic::GarlicRoutingPath> DatagramSession::GetSharedRoutingPath ()
@@ -377,15 +380,19 @@ namespace datagram
 			if (!found)
 			{
 				m_RoutingSession = m_LocalDestination->GetRoutingSession(m_RemoteLeaseSet, true);
-				if (!m_RoutingSession->GetOwner () || !m_RoutingSession->IsReadyToSend ())
-					m_PendingRoutingSessions.push_back (m_RoutingSession);
+				if (m_RoutingSession)
+				{	
+					m_RoutingSession->SetAckRequestInterval (DATAGRAM_SESSION_ACK_REQUEST_INTERVAL);
+					if (!m_RoutingSession->GetOwner () || !m_RoutingSession->IsReadyToSend ())
+						m_PendingRoutingSessions.push_back (m_RoutingSession);
+				}	
 			}
 		}
 
 		auto path = m_RoutingSession->GetSharedRoutingPath();
-		if (path && m_RoutingSession->IsRatchets () &&
-			m_LastUse > m_RoutingSession->GetLastActivityTimestamp ()*1000 + DATAGRAM_SESSION_PATH_TIMEOUT)
+		if (path && m_RoutingSession->IsRatchets () && m_RoutingSession->CleanupUnconfirmedTags ())
 		{
+			LogPrint (eLogDebug, "Datagram: path reset");
 			m_RoutingSession->SetSharedRoutingPath (nullptr);
 			path = nullptr;
 		}
@@ -413,7 +420,14 @@ namespace datagram
 					auto sz = ls.size();
 					if (sz)
 					{
-						auto idx = rand() % sz;
+						int idx = -1;
+						if (m_LocalDestination)
+						{
+							auto pool = m_LocalDestination->GetTunnelPool ();
+							if (pool)
+								idx = pool->GetRng ()() % sz;
+						}
+						if (idx < 0) idx = rand () % sz;
 						path->remoteLease = ls[idx];
 					}
 					else
@@ -439,7 +453,14 @@ namespace datagram
 				auto sz = ls.size();
 				if (sz)
 				{
-					auto idx = rand() % sz;
+					int idx = -1;
+					if (m_LocalDestination)
+					{
+						auto pool = m_LocalDestination->GetTunnelPool ();
+						if (pool)
+							idx = pool->GetRng ()() % sz;
+					}
+					if (idx < 0) idx = rand () % sz;
 					path->remoteLease = ls[idx];
 				}
 				else

libi2pd/Datagram.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -31,8 +31,6 @@ namespace datagram
 {
 	// milliseconds for max session idle time
 	const uint64_t DATAGRAM_SESSION_MAX_IDLE = 10 * 60 * 1000;
-	// milliseconds for how long we try sticking to a dead routing path before trying to switch
-	const uint64_t DATAGRAM_SESSION_PATH_TIMEOUT = 10 * 1000;
 	// milliseconds interval a routing path is used before switching
 	const uint64_t DATAGRAM_SESSION_PATH_SWITCH_INTERVAL = 20 * 60 * 1000;
 	// milliseconds before lease expire should we try switching leases
@@ -43,6 +41,8 @@ namespace datagram
 	const uint64_t DATAGRAM_SESSION_PATH_MIN_LIFETIME = 5 * 1000;
 	// max 64 messages buffered in send queue for each datagram session
 	const size_t DATAGRAM_SEND_QUEUE_MAX_SIZE = 64;
+	const uint64_t DATAGRAM_MAX_FLUSH_INTERVAL = 5; // in milliseconds
+	const int DATAGRAM_SESSION_ACK_REQUEST_INTERVAL = 5500; // in milliseconds
 
 	class DatagramSession : public std::enable_shared_from_this<DatagramSession>
 	{
@@ -98,7 +98,7 @@ namespace datagram
 			std::shared_ptr<i2p::garlic::GarlicRoutingSession> m_RoutingSession;
 			std::vector<std::shared_ptr<i2p::garlic::GarlicRoutingSession> > m_PendingRoutingSessions;
 			std::vector<std::shared_ptr<I2NPMessage> > m_SendQueue;
-			uint64_t m_LastUse;
+			uint64_t m_LastUse, m_LastFlush; // milliseconds
 			bool m_RequestingLS;
 	};
 

libi2pd/Destination.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -23,7 +23,7 @@ namespace i2p
 {
 namespace client
 {
-	LeaseSetDestination::LeaseSetDestination (boost::asio::io_service& service,
+	LeaseSetDestination::LeaseSetDestination (boost::asio::io_context& service,
 		bool isPublic, const std::map<std::string, std::string> * params):
 		m_Service (service), m_IsPublic (isPublic), m_PublishReplyToken (0),
 		m_LastSubmissionTime (0), m_PublishConfirmationTimer (m_Service),
@@ -37,6 +37,7 @@ namespace client
 		int inVar   = DEFAULT_INBOUND_TUNNELS_LENGTH_VARIANCE;
 		int outVar  = DEFAULT_OUTBOUND_TUNNELS_LENGTH_VARIANCE;
 		int numTags = DEFAULT_TAGS_TO_SEND;
+		bool isHighBandwidth = true;
 		std::shared_ptr<std::vector<i2p::data::IdentHash> > explicitPeers;
 		try
 		{
@@ -92,7 +93,7 @@ namespace client
 				it = params->find (I2CP_PARAM_DONT_PUBLISH_LEASESET);
 				if (it != params->end ())
 				{
-					// oveeride isPublic
+					// override isPublic
 					m_IsPublic = (it->second != "true");
 				}
 				it = params->find (I2CP_PARAM_LEASESET_TYPE);
@@ -121,6 +122,9 @@ namespace client
 						m_LeaseSetPrivKey.reset (nullptr);
 					}
 				}
+				it = params->find (I2CP_PARAM_STREAMING_PROFILE);
+				if (it != params->end ())
+					isHighBandwidth = std::stoi (it->second) != STREAMING_PROFILE_INTERACTIVE;
 			}
 		}
 		catch (std::exception & ex)
@@ -128,7 +132,7 @@ namespace client
 			LogPrint(eLogError, "Destination: Unable to parse parameters for destination: ", ex.what());
 		}
 		SetNumTags (numTags);
-		m_Pool = i2p::tunnel::tunnels.CreateTunnelPool (inLen, outLen, inQty, outQty, inVar, outVar);
+		m_Pool = i2p::tunnel::tunnels.CreateTunnelPool (inLen, outLen, inQty, outQty, inVar, outVar, isHighBandwidth);
 		if (explicitPeers)
 			m_Pool->SetExplicitPeers (explicitPeers);
 		if(params)
@@ -164,7 +168,7 @@ namespace client
 		LoadTags ();
 		m_Pool->SetLocalDestination (shared_from_this ());
 		m_Pool->SetActive (true);
-		m_CleanupTimer.expires_from_now (boost::posix_time::minutes (DESTINATION_CLEANUP_TIMEOUT));
+		m_CleanupTimer.expires_from_now (boost::posix_time::seconds (DESTINATION_CLEANUP_TIMEOUT));
 		m_CleanupTimer.async_wait (std::bind (&LeaseSetDestination::HandleCleanupTimer,
 			shared_from_this (), std::placeholders::_1));
 	}
@@ -191,7 +195,7 @@ namespace client
 			m_IsPublic = itr->second != "true";
 		}
 
-		int inLen, outLen, inQuant, outQuant, numTags, minLatency, maxLatency;
+		int inLen = 0, outLen = 0, inQuant = 0, outQuant = 0, numTags = 0, minLatency = 0, maxLatency = 0;
 		std::map<std::string, int&> intOpts = {
 			{I2CP_PARAM_INBOUND_TUNNEL_LENGTH, inLen},
 			{I2CP_PARAM_OUTBOUND_TUNNEL_LENGTH, outLen},
@@ -290,7 +294,7 @@ namespace client
 		if (m_IsPublic)
 		{
 			auto s = shared_from_this ();
-			m_Service.post ([s](void)
+			boost::asio::post (m_Service, [s](void)
 			{
 				s->m_PublishVerificationTimer.cancel ();
 				s->Publish ();
@@ -318,7 +322,7 @@ namespace client
 		memcpy (data.k, key, 32);
 		memcpy (data.t, tag, 32);
 		auto s = shared_from_this ();
-		m_Service.post ([s,data](void)
+		boost::asio::post (m_Service, [s,data](void)
 			{
 				s->AddSessionKey (data.k, data.t);
 			});
@@ -335,7 +339,7 @@ namespace client
 		memcpy (data.k, key, 32);
 		data.t = tag;
 		auto s = shared_from_this ();
-		m_Service.post ([s,data](void)
+		boost::asio::post (m_Service, [s,data](void)
 			{
 				s->AddECIESx25519Key (data.k, data.t);
 			});
@@ -343,13 +347,30 @@ namespace client
 
 	void LeaseSetDestination::ProcessGarlicMessage (std::shared_ptr<I2NPMessage> msg)
 	{
-		m_Service.post (std::bind (&LeaseSetDestination::HandleGarlicMessage, shared_from_this (), msg));
+		if (!msg) return;
+		bool empty = false;
+		{
+			std::lock_guard<std::mutex> l(m_IncomingMsgsQueueMutex);
+			empty = m_IncomingMsgsQueue.empty ();
+			m_IncomingMsgsQueue.push_back (msg);
+		}
+		if (empty)
+			boost::asio::post (m_Service, [s = shared_from_this ()]() 
+			{ 
+				std::list<std::shared_ptr<I2NPMessage> > receivedMsgs;
+				{
+					std::lock_guard<std::mutex> l(s->m_IncomingMsgsQueueMutex);
+					s->m_IncomingMsgsQueue.swap (receivedMsgs);
+				}
+			    for (auto& it: receivedMsgs)
+			    	s->HandleGarlicMessage (it);               
+			});
 	}
 
 	void LeaseSetDestination::ProcessDeliveryStatusMessage (std::shared_ptr<I2NPMessage> msg)
 	{
 		uint32_t msgID = bufbe32toh (msg->GetPayload () + DELIVERY_STATUS_MSGID_OFFSET);
-		m_Service.post (std::bind (&LeaseSetDestination::HandleDeliveryStatusMessage, shared_from_this (), msgID));
+		boost::asio::post (m_Service, std::bind (&LeaseSetDestination::HandleDeliveryStatusMessage, shared_from_this (), msgID));
 	}
 
 	void LeaseSetDestination::HandleI2NPMessage (const uint8_t * buf, size_t len)
@@ -467,7 +488,7 @@ namespace client
 			{
 				auto it2 = m_LeaseSetRequests.find (key);
 				if (it2 != m_LeaseSetRequests.end ())
-				{	
+				{
 					request = it2->second;
 					m_LeaseSetRequests.erase (it2);
 					if (request->requestedBlindedKey)
@@ -489,14 +510,14 @@ namespace client
 						// publishing verification doesn't have requestedBlindedKey
 						auto localLeaseSet = GetLeaseSetMt ();
 						if (localLeaseSet->GetStoreHash () == key)
-						{	
-							auto ls = std::make_shared<i2p::data::LeaseSet2> (i2p::data::NETDB_STORE_TYPE_ENCRYPTED_LEASESET2, 
+						{
+							auto ls = std::make_shared<i2p::data::LeaseSet2> (i2p::data::NETDB_STORE_TYPE_ENCRYPTED_LEASESET2,
 								localLeaseSet->GetBuffer (), localLeaseSet->GetBufferLen (), false);
-							leaseSet = ls;	
-						}	
+							leaseSet = ls;
+						}
 						else
 							LogPrint (eLogWarning, "Destination: Encrypted LeaseSet2 received for request without blinded key");
-					}	
+					}
 				}
 				else
 					LogPrint (eLogWarning, "Destination: Couldn't find request for encrypted LeaseSet2");
@@ -507,14 +528,14 @@ namespace client
 		}
 
 		if (!request)
-		{	
+		{
 			auto it1 = m_LeaseSetRequests.find (key);
 			if (it1 != m_LeaseSetRequests.end ())
-			{	
+			{
 				request = it1->second;
 				m_LeaseSetRequests.erase (it1);
-			}	
-		}	
+			}
+		}
 		if (request)
 		{
 			request->requestTimeoutTimer.cancel ();
@@ -546,7 +567,7 @@ namespace client
 			LogPrint (eLogWarning, "Destination: Request for ", key.ToBase64 (), " not found");
 	}
 
-	void LeaseSetDestination::SendNextLeaseSetRequest (const i2p::data::IdentHash& key, 
+	void LeaseSetDestination::SendNextLeaseSetRequest (const i2p::data::IdentHash& key,
 		std::shared_ptr<LeaseSetRequest> request)
 	{
 		bool found = false;
@@ -566,8 +587,8 @@ namespace client
 			request->Complete (nullptr);
 			m_LeaseSetRequests.erase (key);
 		}
-	}	
-		
+	}
+
 	void LeaseSetDestination::HandleDeliveryStatusMessage (uint32_t msgID)
 	{
 		if (msgID == m_PublishReplyToken)
@@ -576,7 +597,8 @@ namespace client
 			m_ExcludedFloodfills.clear ();
 			m_PublishReplyToken = 0;
 			// schedule verification
-			m_PublishVerificationTimer.expires_from_now (boost::posix_time::seconds(PUBLISH_VERIFICATION_TIMEOUT));
+			m_PublishVerificationTimer.expires_from_now (boost::posix_time::seconds(PUBLISH_VERIFICATION_TIMEOUT +
+				(m_Pool ? m_Pool->GetRng ()() % PUBLISH_VERIFICATION_TIMEOUT_VARIANCE : 0)));
 			m_PublishVerificationTimer.async_wait (std::bind (&LeaseSetDestination::HandlePublishVerificationTimer,
 			shared_from_this (), std::placeholders::_1));
 		}
@@ -584,9 +606,12 @@ namespace client
 			i2p::garlic::GarlicDestination::HandleDeliveryStatusMessage (msgID);
 	}
 
-	void LeaseSetDestination::SetLeaseSetUpdated ()
+	void LeaseSetDestination::SetLeaseSetUpdated (bool post)
 	{
-		UpdateLeaseSet ();
+		if (post)
+			boost::asio::post (m_Service, [s = shared_from_this ()]() { s->UpdateLeaseSet (); });
+		else
+			UpdateLeaseSet ();
 	}
 
 	void LeaseSetDestination::Publish ()
@@ -624,7 +649,7 @@ namespace client
 		if (!outbound || !inbound)
 		{
 			if (!m_Pool->GetInboundTunnels ().empty () && !m_Pool->GetOutboundTunnels ().empty ())
-			{	
+			{
 				LogPrint (eLogInfo, "Destination: No compatible tunnels with ", floodfill->GetIdentHash ().ToBase64 (), ". Trying another floodfill");
 				m_ExcludedFloodfills.insert (floodfill->GetIdentHash ());
 				floodfill = i2p::data::netdb.GetClosestFloodfill (leaseSet->GetStoreHash (), m_ExcludedFloodfills);
@@ -642,18 +667,18 @@ namespace client
 				}
 				else
 					LogPrint (eLogError, "Destination: Can't publish LeaseSet, no more floodfills found");
-			}	
+			}
 			else
 				LogPrint (eLogDebug, "Destination: No tunnels in pool");
-			
+
 			if (!floodfill || !outbound || !inbound)
 			{
 				// we can't publish now
 				m_ExcludedFloodfills.clear ();
 				m_PublishReplyToken = 1; // dummy non-zero value
 				// try again after a while
-				LogPrint (eLogInfo, "Destination: Can't publish LeasetSet because destination is not ready. Try publishing again after ", PUBLISH_CONFIRMATION_TIMEOUT, " seconds");
-				m_PublishConfirmationTimer.expires_from_now (boost::posix_time::seconds(PUBLISH_CONFIRMATION_TIMEOUT));
+				LogPrint (eLogInfo, "Destination: Can't publish LeasetSet because destination is not ready. Try publishing again after ", PUBLISH_CONFIRMATION_TIMEOUT, " milliseconds");
+				m_PublishConfirmationTimer.expires_from_now (boost::posix_time::milliseconds(PUBLISH_CONFIRMATION_TIMEOUT));
 				m_PublishConfirmationTimer.async_wait (std::bind (&LeaseSetDestination::HandlePublishConfirmationTimer,
 					shared_from_this (), std::placeholders::_1));
 				return;
@@ -666,13 +691,13 @@ namespace client
 		auto s = shared_from_this ();
 		msg->onDrop = [s]()
 			{
-				s->GetService ().post([s]()
+				boost::asio::post (s->GetService (), [s]()
 					{
 						s->m_PublishConfirmationTimer.cancel ();
 						s->HandlePublishConfirmationTimer (boost::system::error_code());
 					});
 			};
-		m_PublishConfirmationTimer.expires_from_now (boost::posix_time::seconds(PUBLISH_CONFIRMATION_TIMEOUT));
+		m_PublishConfirmationTimer.expires_from_now (boost::posix_time::milliseconds(PUBLISH_CONFIRMATION_TIMEOUT));
 		m_PublishConfirmationTimer.async_wait (std::bind (&LeaseSetDestination::HandlePublishConfirmationTimer,
 			shared_from_this (), std::placeholders::_1));
 		outbound->SendTunnelDataMsgTo (floodfill->GetIdentHash (), 0, msg);
@@ -688,15 +713,15 @@ namespace client
 				m_PublishReplyToken = 0;
 				if (GetIdentity ()->GetCryptoKeyType () == i2p::data::CRYPTO_KEY_TYPE_ELGAMAL)
 				{
-					LogPrint (eLogWarning, "Destination: Publish confirmation was not received in ", PUBLISH_CONFIRMATION_TIMEOUT, " seconds or failed. will try again");
+					LogPrint (eLogWarning, "Destination: Publish confirmation was not received in ", PUBLISH_CONFIRMATION_TIMEOUT, " milliseconds or failed. will try again");
 					Publish ();
 				}
 				else
 				{
-					LogPrint (eLogWarning, "Destination: Publish confirmation was not received in ", PUBLISH_CONFIRMATION_TIMEOUT, " seconds from Java floodfill for crypto type ", (int)GetIdentity ()->GetCryptoKeyType ());
+					LogPrint (eLogWarning, "Destination: Publish confirmation was not received in ", PUBLISH_CONFIRMATION_TIMEOUT, " milliseconds from Java floodfill for crypto type ", (int)GetIdentity ()->GetCryptoKeyType ());
 					// Java floodfill never sends confirmation back for unknown crypto type
 					// assume it successive and try to verify
-					m_PublishVerificationTimer.expires_from_now (boost::posix_time::seconds(PUBLISH_VERIFICATION_TIMEOUT));
+					m_PublishVerificationTimer.expires_from_now (boost::posix_time::seconds(PUBLISH_VERIFICATION_TIMEOUT + PUBLISH_VERIFICATION_TIMEOUT_VARIANCE)); // always max
 					m_PublishVerificationTimer.async_wait (std::bind (&LeaseSetDestination::HandlePublishVerificationTimer,
 			shared_from_this (), std::placeholders::_1));
 
@@ -751,10 +776,10 @@ namespace client
 		if (!m_Pool || !IsReady ())
 		{
 			if (requestComplete)
-				m_Service.post ([requestComplete](void){requestComplete (nullptr);});
+				boost::asio::post (m_Service, [requestComplete](void){requestComplete (nullptr);});
 			return false;
 		}
-		m_Service.post (std::bind (&LeaseSetDestination::RequestLeaseSet, shared_from_this (), dest, requestComplete, nullptr));
+		boost::asio::post (m_Service, std::bind (&LeaseSetDestination::RequestLeaseSet, shared_from_this (), dest, requestComplete, nullptr));
 		return true;
 	}
 
@@ -763,7 +788,7 @@ namespace client
 		if (!dest || !m_Pool || !IsReady ())
 		{
 			if (requestComplete)
-				m_Service.post ([requestComplete](void){requestComplete (nullptr);});
+				boost::asio::post (m_Service, [requestComplete](void){requestComplete (nullptr);});
 			return false;
 		}
 		auto storeHash = dest->GetStoreHash ();
@@ -771,17 +796,17 @@ namespace client
 		if (leaseSet)
 		{
 			if (requestComplete)
-				m_Service.post ([requestComplete, leaseSet](void){requestComplete (leaseSet);});
+				boost::asio::post (m_Service, [requestComplete, leaseSet](void){requestComplete (leaseSet);});
 			return true;
 		}
-		m_Service.post (std::bind (&LeaseSetDestination::RequestLeaseSet, shared_from_this (), storeHash, requestComplete, dest));
+		boost::asio::post (m_Service, std::bind (&LeaseSetDestination::RequestLeaseSet, shared_from_this (), storeHash, requestComplete, dest));
 		return true;
 	}
 
 	void LeaseSetDestination::CancelDestinationRequest (const i2p::data::IdentHash& dest, bool notify)
 	{
 		auto s = shared_from_this ();
-		m_Service.post ([dest, notify, s](void)
+		boost::asio::post (m_Service, [dest, notify, s](void)
 			{
 				auto it = s->m_LeaseSetRequests.find (dest);
 				if (it != s->m_LeaseSetRequests.end ())
@@ -801,7 +826,7 @@ namespace client
 
 	void LeaseSetDestination::RequestLeaseSet (const i2p::data::IdentHash& dest, RequestComplete requestComplete, std::shared_ptr<const i2p::data::BlindedPublicKey> requestedBlindedKey)
 	{
-		std::set<i2p::data::IdentHash> excluded;
+		std::unordered_set<i2p::data::IdentHash> excluded;
 		auto floodfill = i2p::data::netdb.GetClosestFloodfill (dest, excluded);
 		if (floodfill)
 		{
@@ -809,7 +834,7 @@ namespace client
 			request->requestedBlindedKey = requestedBlindedKey; // for encrypted LeaseSet2
 			if (requestComplete)
 				request->requestComplete.push_back (requestComplete);
-			auto ts = i2p::util::GetSecondsSinceEpoch ();
+			auto ts = i2p::util::GetMillisecondsSinceEpoch ();
 			auto ret = m_LeaseSetRequests.insert (std::pair<i2p::data::IdentHash, std::shared_ptr<LeaseSetRequest> >(dest,request));
 			if (ret.second) // inserted
 			{
@@ -873,17 +898,17 @@ namespace client
 				AddECIESx25519Key (replyKey, replyTag);
 			else
 				AddSessionKey (replyKey, replyTag);
-			
-			auto msg = WrapMessageForRouter (nextFloodfill, 
+
+			auto msg = WrapMessageForRouter (nextFloodfill,
 				CreateLeaseSetDatabaseLookupMsg (dest, request->excluded, request->replyTunnel, replyKey, replyTag, isECIES));
 			auto s = shared_from_this ();
 			msg->onDrop = [s, dest, request]()
 				{
-					s->GetService ().post([s, dest, request]()
+					boost::asio::post (s->GetService (), [s, dest, request]()
 						{
 							s->SendNextLeaseSetRequest (dest, request);
 						});
-				};	
+				};
 			request->outboundTunnel->SendTunnelDataMsgs (
 				{
 					i2p::tunnel::TunnelMessageBlock
@@ -892,7 +917,7 @@ namespace client
 						nextFloodfill->GetIdentHash (), 0, msg
 					}
 				});
-			request->requestTimeoutTimer.expires_from_now (boost::posix_time::seconds(LEASESET_REQUEST_TIMEOUT));
+			request->requestTimeoutTimer.expires_from_now (boost::posix_time::milliseconds(LEASESET_REQUEST_TIMEOUT));
 			request->requestTimeoutTimer.async_wait (std::bind (&LeaseSetDestination::HandleRequestTimoutTimer,
 				shared_from_this (), std::placeholders::_1, dest));
 		}
@@ -909,7 +934,7 @@ namespace client
 			if (it != m_LeaseSetRequests.end ())
 			{
 				bool done = false;
-				uint64_t ts = i2p::util::GetSecondsSinceEpoch ();
+				uint64_t ts = i2p::util::GetMillisecondsSinceEpoch ();
 				if (ts < it->second->requestTime + MAX_LEASESET_REQUEST_TIMEOUT)
 				{
 					auto floodfill = i2p::data::netdb.GetClosestFloodfill (dest, it->second->excluded);
@@ -946,7 +971,8 @@ namespace client
 			CleanupExpiredTags ();
 			CleanupRemoteLeaseSets ();
 			CleanupDestination ();
-			m_CleanupTimer.expires_from_now (boost::posix_time::minutes (DESTINATION_CLEANUP_TIMEOUT));
+			m_CleanupTimer.expires_from_now (boost::posix_time::seconds (DESTINATION_CLEANUP_TIMEOUT +
+				(m_Pool ? m_Pool->GetRng ()() % DESTINATION_CLEANUP_TIMEOUT_VARIANCE : 0)));
 			m_CleanupTimer.async_wait (std::bind (&LeaseSetDestination::HandleCleanupTimer,
 				shared_from_this (), std::placeholders::_1));
 		}
@@ -960,7 +986,7 @@ namespace client
 		{
 			if (it->second->IsEmpty () || ts > it->second->GetExpirationTime ()) // leaseset expired
 			{
-				LogPrint (eLogWarning, "Destination: Remote LeaseSet ", it->second->GetIdentHash ().ToBase64 (), " expired");
+				LogPrint (eLogDebug, "Destination: Remote LeaseSet ", it->second->GetIdentHash ().ToBase64 (), " expired");
 				it = m_RemoteLeaseSets.erase (it);
 			}
 			else
@@ -975,12 +1001,15 @@ namespace client
 		return i2p::data::CRYPTO_KEY_TYPE_ELGAMAL;
 	}
 
-	ClientDestination::ClientDestination (boost::asio::io_service& service, const i2p::data::PrivateKeys& keys,
+	ClientDestination::ClientDestination (boost::asio::io_context& service, const i2p::data::PrivateKeys& keys,
 		bool isPublic, const std::map<std::string, std::string> * params):
 		LeaseSetDestination (service, isPublic, params),
 		m_Keys (keys), m_StreamingAckDelay (DEFAULT_INITIAL_ACK_DELAY),
+		m_StreamingOutboundSpeed (DEFAULT_MAX_OUTBOUND_SPEED),
+		m_StreamingInboundSpeed (DEFAULT_MAX_INBOUND_SPEED),
+		m_StreamingMaxConcurrentStreams (DEFAULT_MAX_CONCURRENT_STREAMS),
 		m_IsStreamingAnswerPings (DEFAULT_ANSWER_PINGS), m_LastPort (0),
-		m_DatagramDestination (nullptr), m_RefCounter (0),
+		m_DatagramDestination (nullptr), m_RefCounter (0), m_LastPublishedTimestamp (0),
 		m_ReadyChecker(service)
 	{
 		if (keys.IsOfflineSignature () && GetLeaseSetType () == i2p::data::NETDB_STORE_TYPE_LEASESET)
@@ -1011,18 +1040,15 @@ namespace client
 			}
 		}
 		// if no param or valid crypto type use from identity
-		bool isSingleKey = false;
 		if (encryptionKeyTypes.empty ())
-		{
-			isSingleKey = true;
-			encryptionKeyTypes.insert (GetIdentity ()->GetCryptoKeyType ());
-		}
+			encryptionKeyTypes.insert ( { GetIdentity ()->GetCryptoKeyType (),
+				i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD }); // usually 0,4
 
 		for (auto& it: encryptionKeyTypes)
 		{
 			auto encryptionKey = new EncryptionKey (it);
 			if (IsPublic ())
-				PersistTemporaryKeys (encryptionKey, isSingleKey);
+				PersistTemporaryKeys (encryptionKey);
 			else
 				encryptionKey->GenerateKeys ();
 			encryptionKey->CreateDecryptor ();
@@ -1047,6 +1073,14 @@ namespace client
 				auto it = params->find (I2CP_PARAM_STREAMING_INITIAL_ACK_DELAY);
 				if (it != params->end ())
 					m_StreamingAckDelay = std::stoi(it->second);
+				it = params->find (I2CP_PARAM_STREAMING_MAX_OUTBOUND_SPEED);
+				if (it != params->end ())
+					m_StreamingOutboundSpeed = std::stoi(it->second);
+				it = params->find (I2CP_PARAM_STREAMING_MAX_INBOUND_SPEED);
+				if (it != params->end ())
+					m_StreamingInboundSpeed = std::stoi(it->second);
+				if (it != params->end ())
+					m_StreamingMaxConcurrentStreams = std::stoi(it->second);
 				it = params->find (I2CP_PARAM_STREAMING_ANSWER_PINGS);
 				if (it != params->end ())
 					m_IsStreamingAnswerPings = std::stoi (it->second); // 1 for true
@@ -1097,7 +1131,6 @@ namespace client
 	void ClientDestination::Stop ()
 	{
 		LogPrint(eLogDebug, "Destination: Stopping destination ", GetIdentHash().ToBase32(), ".b32.i2p");
-		LeaseSetDestination::Stop ();
 		m_ReadyChecker.cancel();
 		LogPrint(eLogDebug, "Destination: -> Stopping Streaming Destination");
 		m_StreamingDestination->Stop ();
@@ -1119,6 +1152,7 @@ namespace client
 			delete m_DatagramDestination;
 			m_DatagramDestination = nullptr;
 		}
+		LeaseSetDestination::Stop ();
 		LogPrint(eLogDebug, "Destination: -> Stopping done");
 	}
 
@@ -1182,7 +1216,7 @@ namespace client
 		if (leaseSet)
 		{
 			auto stream = CreateStream (leaseSet, port);
-			GetService ().post ([streamRequestComplete, stream]()
+			boost::asio::post (GetService (), [streamRequestComplete, stream]()
 				{
 					streamRequestComplete(stream);
 				});
@@ -1375,12 +1409,11 @@ namespace client
 		return ret;
 	}
 
-	void ClientDestination::PersistTemporaryKeys (EncryptionKey * keys, bool isSingleKey)
+	void ClientDestination::PersistTemporaryKeys (EncryptionKey * keys)
 	{
 		if (!keys) return;
 		std::string ident = GetIdentHash().ToBase32();
-		std::string path  = i2p::fs::DataDirPath("destinations",
-			isSingleKey ? (ident + ".dat") : (ident + "." + std::to_string (keys->keyType) + ".dat"));
+		std::string path  = i2p::fs::DataDirPath("destinations", ident + "." + std::to_string (keys->keyType) + ".dat");
 		std::ifstream f(path, std::ifstream::binary);
 
 		if (f) {
@@ -1426,12 +1459,19 @@ namespace client
 			if (m_StandardEncryptionKey)
 				keySections.push_back ({m_StandardEncryptionKey->keyType, (uint16_t)m_StandardEncryptionKey->decryptor->GetPublicKeyLen (), m_StandardEncryptionKey->pub} );
 
+			auto publishedTimestamp = i2p::util::GetSecondsSinceEpoch ();
+			if (publishedTimestamp <= m_LastPublishedTimestamp)
+			{
+				LogPrint (eLogDebug, "Destination: LeaseSet update at the same second");
+				publishedTimestamp++; // force newer timestamp
+			}
 			bool isPublishedEncrypted = GetLeaseSetType () == i2p::data::NETDB_STORE_TYPE_ENCRYPTED_LEASESET2;
 			auto ls2 = std::make_shared<i2p::data::LocalLeaseSet2> (i2p::data::NETDB_STORE_TYPE_STANDARD_LEASESET2,
-				m_Keys, keySections, tunnels, IsPublic (), isPublishedEncrypted);
+				m_Keys, keySections, tunnels, IsPublic (), publishedTimestamp, isPublishedEncrypted);
 			if (isPublishedEncrypted) // encrypt if type 5
 				ls2 = std::make_shared<i2p::data::LocalEncryptedLeaseSet2> (ls2, m_Keys, GetAuthType (), m_AuthKeys);
 			leaseSet = ls2;
+			m_LastPublishedTimestamp = publishedTimestamp;
 		}
 		SetLeaseSet (leaseSet);
 	}
@@ -1496,6 +1536,8 @@ namespace client
 		RunnableService ("Destination"),
 		ClientDestination (GetIOService (), keys, isPublic, params)
 	{
+		if (!GetNickname ().empty ())
+			RunnableService::SetName (GetNickname ());
 	}
 
 	RunnableClientDestination::~RunnableClientDestination ()

libi2pd/Destination.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -15,7 +15,7 @@
 #include <memory>
 #include <map>
 #include <unordered_map>
-#include <set>
+#include <unordered_set>
 #include <string>
 #include <functional>
 #include <boost/asio.hpp>
@@ -36,13 +36,15 @@ namespace client
 	const uint8_t PROTOCOL_TYPE_STREAMING = 6;
 	const uint8_t PROTOCOL_TYPE_DATAGRAM = 17;
 	const uint8_t PROTOCOL_TYPE_RAW = 18;
-	const int PUBLISH_CONFIRMATION_TIMEOUT = 5; // in seconds
-	const int PUBLISH_VERIFICATION_TIMEOUT = 10; // in seconds after successful publish
+	const int PUBLISH_CONFIRMATION_TIMEOUT = 1800; // in milliseconds
+	const int PUBLISH_VERIFICATION_TIMEOUT = 5; // in seconds after successful publish
+	const int PUBLISH_VERIFICATION_TIMEOUT_VARIANCE = 3; // in seconds
 	const int PUBLISH_MIN_INTERVAL = 20; // in seconds
 	const int PUBLISH_REGULAR_VERIFICATION_INTERNAL = 100; // in seconds periodically
-	const int LEASESET_REQUEST_TIMEOUT = 5; // in seconds
-	const int MAX_LEASESET_REQUEST_TIMEOUT = 40; // in seconds
-	const int DESTINATION_CLEANUP_TIMEOUT = 3; // in minutes
+	const int LEASESET_REQUEST_TIMEOUT = 1600; // in milliseconds
+	const int MAX_LEASESET_REQUEST_TIMEOUT = 12000; // in milliseconds
+	const int DESTINATION_CLEANUP_TIMEOUT = 44; // in seconds
+	const int DESTINATION_CLEANUP_TIMEOUT_VARIANCE = 30; // in seconds
 	const unsigned int MAX_NUM_FLOODFILLS_PER_REQUEST = 7;
 
 	// I2CP
@@ -84,9 +86,19 @@ namespace client
 	// streaming
 	const char I2CP_PARAM_STREAMING_INITIAL_ACK_DELAY[] = "i2p.streaming.initialAckDelay";
 	const int DEFAULT_INITIAL_ACK_DELAY = 200; // milliseconds
+	const char I2CP_PARAM_STREAMING_MAX_OUTBOUND_SPEED[] = "i2p.streaming.maxOutboundSpeed"; // bytes/sec
+	const int DEFAULT_MAX_OUTBOUND_SPEED = 1730000000; // no more than 1.73 Gbytes/s
+	const char I2CP_PARAM_STREAMING_MAX_INBOUND_SPEED[] = "i2p.streaming.maxInboundSpeed"; // bytes/sec
+	const int DEFAULT_MAX_INBOUND_SPEED = 1730000000; // no more than 1.73 Gbytes/s
 	const char I2CP_PARAM_STREAMING_ANSWER_PINGS[] = "i2p.streaming.answerPings";
 	const int DEFAULT_ANSWER_PINGS = true;
-
+	const char I2CP_PARAM_STREAMING_PROFILE[] = "i2p.streaming.profile";
+	const int STREAMING_PROFILE_BULK = 1; // high bandwidth
+	const int STREAMING_PROFILE_INTERACTIVE = 2; // low bandwidth
+	const int DEFAULT_STREAMING_PROFILE = STREAMING_PROFILE_BULK;
+	const char I2CP_PARAM_STREAMING_MAX_CONCURRENT_STREAMS[] = "i2p.streaming.maxConcurrentStreams";
+	const int DEFAULT_MAX_CONCURRENT_STREAMS = 2048;
+	
 	typedef std::function<void (std::shared_ptr<i2p::stream::Stream> stream)> StreamRequestComplete;
 
 	class LeaseSetDestination: public i2p::garlic::GarlicDestination,
@@ -96,8 +108,8 @@ namespace client
 		// leaseSet = nullptr means not found
 		struct LeaseSetRequest
 		{
-			LeaseSetRequest (boost::asio::io_service& service): requestTime (0), requestTimeoutTimer (service) {};
-			std::set<i2p::data::IdentHash> excluded;
+			LeaseSetRequest (boost::asio::io_context& service): requestTime (0), requestTimeoutTimer (service) {};
+			std::unordered_set<i2p::data::IdentHash> excluded;
 			uint64_t requestTime;
 			boost::asio::deadline_timer requestTimeoutTimer;
 			std::list<RequestComplete> requestComplete;
@@ -114,10 +126,10 @@ namespace client
 
 		public:
 
-			LeaseSetDestination (boost::asio::io_service& service, bool isPublic, const std::map<std::string, std::string> * params = nullptr);
+			LeaseSetDestination (boost::asio::io_context& service, bool isPublic, const std::map<std::string, std::string> * params = nullptr);
 			~LeaseSetDestination ();
 			const std::string& GetNickname () const { return m_Nickname; };
-			boost::asio::io_service& GetService () { return m_Service; };
+			auto& GetService () { return m_Service; };
 
 			virtual void Start ();
 			virtual void Stop ();
@@ -134,15 +146,15 @@ namespace client
 			void CancelDestinationRequestWithEncryptedLeaseSet (std::shared_ptr<const i2p::data::BlindedPublicKey> dest, bool notify = true);
 
 			// implements GarlicDestination
-			std::shared_ptr<const i2p::data::LocalLeaseSet> GetLeaseSet ();
-			std::shared_ptr<i2p::tunnel::TunnelPool> GetTunnelPool () const { return m_Pool; }
+			std::shared_ptr<const i2p::data::LocalLeaseSet> GetLeaseSet () override;
+			std::shared_ptr<i2p::tunnel::TunnelPool> GetTunnelPool () const override { return m_Pool; }
 
 			// override GarlicDestination
-			bool SubmitSessionKey (const uint8_t * key, const uint8_t * tag);
-			void SubmitECIESx25519Key (const uint8_t * key, uint64_t tag);
-			void ProcessGarlicMessage (std::shared_ptr<I2NPMessage> msg);
-			void ProcessDeliveryStatusMessage (std::shared_ptr<I2NPMessage> msg);
-			void SetLeaseSetUpdated ();
+			bool SubmitSessionKey (const uint8_t * key, const uint8_t * tag) override;
+			void SubmitECIESx25519Key (const uint8_t * key, uint64_t tag) override;
+			void ProcessGarlicMessage (std::shared_ptr<I2NPMessage> msg) override;
+			void ProcessDeliveryStatusMessage (std::shared_ptr<I2NPMessage> msg) override;
+			void SetLeaseSetUpdated (bool post) override;
 
 			bool IsPublic () const { return m_IsPublic; };
 			void SetPublic (bool pub) { m_IsPublic = pub; };
@@ -150,8 +162,8 @@ namespace client
 		protected:
 
 			// implements GarlicDestination
-			void HandleI2NPMessage (const uint8_t * buf, size_t len);
-			bool HandleCloveI2NPMessage (I2NPMessageType typeID, const uint8_t * payload, size_t len, uint32_t msgID);
+			void HandleI2NPMessage (const uint8_t * buf, size_t len) override;
+			bool HandleCloveI2NPMessage (I2NPMessageType typeID, const uint8_t * payload, size_t len, uint32_t msgID) override;
 
 			void SetLeaseSet (std::shared_ptr<const i2p::data::LocalLeaseSet> newLeaseSet);
 			int GetLeaseSetType () const { return m_LeaseSetType; };
@@ -184,18 +196,21 @@ namespace client
 
 		private:
 
-			boost::asio::io_service& m_Service;
+			boost::asio::io_context& m_Service;
 			mutable std::mutex m_RemoteLeaseSetsMutex;
 			std::unordered_map<i2p::data::IdentHash, std::shared_ptr<i2p::data::LeaseSet> > m_RemoteLeaseSets;
 			std::unordered_map<i2p::data::IdentHash, std::shared_ptr<LeaseSetRequest> > m_LeaseSetRequests;
 
+			std::list<std::shared_ptr<I2NPMessage> > m_IncomingMsgsQueue;
+			mutable std::mutex m_IncomingMsgsQueueMutex;
+			
 			std::shared_ptr<i2p::tunnel::TunnelPool> m_Pool;
 			std::mutex m_LeaseSetMutex;
 			std::shared_ptr<const i2p::data::LocalLeaseSet> m_LeaseSet;
 			bool m_IsPublic;
 			uint32_t m_PublishReplyToken;
 			uint64_t m_LastSubmissionTime; // in seconds
-			std::set<i2p::data::IdentHash> m_ExcludedFloodfills; // for publishing
+			std::unordered_set<i2p::data::IdentHash> m_ExcludedFloodfills; // for publishing
 
 			boost::asio::deadline_timer m_PublishConfirmationTimer, m_PublishVerificationTimer,
 				m_PublishDelayTimer, m_CleanupTimer;
@@ -227,7 +242,7 @@ namespace client
 
 		public:
 
-			ClientDestination (boost::asio::io_service& service, const i2p::data::PrivateKeys& keys,
+			ClientDestination (boost::asio::io_context& service, const i2p::data::PrivateKeys& keys,
 				bool isPublic, const std::map<std::string, std::string> * params = nullptr);
 			~ClientDestination ();
 
@@ -259,6 +274,9 @@ namespace client
 			bool IsAcceptingStreams () const;
 			void AcceptOnce (const i2p::stream::StreamingDestination::Acceptor& acceptor);
 			int GetStreamingAckDelay () const { return m_StreamingAckDelay; }
+			int GetStreamingOutboundSpeed () const { return m_StreamingOutboundSpeed; }
+			int GetStreamingInboundSpeed () const { return m_StreamingInboundSpeed; }
+			int GetStreamingMaxConcurrentStreams () const { return m_StreamingMaxConcurrentStreams; }
 			bool IsStreamingAnswerPings () const { return m_IsStreamingAnswerPings; }
 
 			// datagram
@@ -283,7 +301,7 @@ namespace client
 			std::shared_ptr<ClientDestination> GetSharedFromThis () {
 				return std::static_pointer_cast<ClientDestination>(shared_from_this ());
 			}
-			void PersistTemporaryKeys (EncryptionKey * keys, bool isSingleKey);
+			void PersistTemporaryKeys (EncryptionKey * keys);
 			void ReadAuthKey (const std::string& group, const std::map<std::string, std::string> * params);
 
 			template<typename Dest>
@@ -295,13 +313,14 @@ namespace client
 			std::unique_ptr<EncryptionKey> m_StandardEncryptionKey;
 			std::unique_ptr<EncryptionKey> m_ECIESx25519EncryptionKey;
 
-			int m_StreamingAckDelay;
+			int m_StreamingAckDelay,m_StreamingOutboundSpeed, m_StreamingInboundSpeed, m_StreamingMaxConcurrentStreams;
 			bool m_IsStreamingAnswerPings;
 			std::shared_ptr<i2p::stream::StreamingDestination> m_StreamingDestination; // default
 			std::map<uint16_t, std::shared_ptr<i2p::stream::StreamingDestination> > m_StreamingDestinationsByPorts;
 			std::shared_ptr<i2p::stream::StreamingDestination> m_LastStreamingDestination; uint16_t m_LastPort; // for server tunnels
 			i2p::datagram::DatagramDestination * m_DatagramDestination;
 			int m_RefCounter; // how many clients(tunnels) use this destination
+			uint64_t m_LastPublishedTimestamp;
 
 			boost::asio::deadline_timer m_ReadyChecker;
 

libi2pd/ECIESX25519AEADRatchetSession.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -229,6 +229,29 @@ namespace garlic
 		tagsetNsr->NextSessionTagRatchet ();
 	}
 
+	bool ECIESX25519AEADRatchetSession::MessageConfirmed (uint32_t msgID)
+	{
+		auto ret = GarlicRoutingSession::MessageConfirmed (msgID); // LeaseSet
+		if (m_AckRequestMsgID && m_AckRequestMsgID == msgID)
+		{
+			m_AckRequestMsgID = 0;
+			m_AckRequestNumAttempts = 0;
+			ret = true;
+		}	
+		return ret;
+	}	
+
+	bool ECIESX25519AEADRatchetSession::CleanupUnconfirmedTags ()
+	{
+		if (m_AckRequestMsgID && m_AckRequestNumAttempts > ECIESX25519_ACK_REQUEST_MAX_NUM_ATTEMPTS)
+		{
+			m_AckRequestMsgID = 0;
+			m_AckRequestNumAttempts = 0;
+			return true;	
+		}
+		return false;
+	}	
+		
 	bool ECIESX25519AEADRatchetSession::HandleNewIncomingSession (const uint8_t * buf, size_t len)
 	{
 		if (!GetOwner ()) return false;
@@ -333,8 +356,9 @@ namespace garlic
 					auto offset1 = offset;
 					for (auto i = 0; i < numAcks; i++)
 					{
-						offset1 += 2; // tagsetid
-						MessageConfirmed (bufbe16toh (buf + offset1)); offset1 += 2; // N
+						uint32_t tagsetid = bufbe16toh (buf + offset1); offset1 += 2; // tagsetid
+						uint16_t n = bufbe16toh (buf + offset1); offset1 += 2; // N
+						MessageConfirmed ((tagsetid << 16) + n); // msgid = (tagsetid << 16) + N
 					}
 					break;
 				}
@@ -397,7 +421,6 @@ namespace garlic
 		{
 			uint16_t keyID = bufbe16toh (buf); buf += 2; // keyID
 			bool newKey = flag & ECIESX25519_NEXT_KEY_REQUEST_REVERSE_KEY_FLAG;
-			m_SendReverseKey = true;
 			if (!m_NextReceiveRatchet)
 				m_NextReceiveRatchet.reset (new DHRatchet ());
 			else
@@ -409,15 +432,14 @@ namespace garlic
 				}
 				m_NextReceiveRatchet->keyID = keyID;
 			}
-			int tagsetID = 2*keyID;
 			if (newKey)
 			{
 				m_NextReceiveRatchet->key = i2p::transport::transports.GetNextX25519KeysPair ();
 				m_NextReceiveRatchet->newKey = true;
-				tagsetID++;
 			}
 			else
 				m_NextReceiveRatchet->newKey = false;
+			auto tagsetID = m_NextReceiveRatchet->GetReceiveTagSetID ();
 			if (flag & ECIESX25519_NEXT_KEY_KEY_PRESENT_FLAG)
 				memcpy (m_NextReceiveRatchet->remote, buf, 32);
 
@@ -431,7 +453,9 @@ namespace garlic
 			GenerateMoreReceiveTags (newTagset, (GetOwner () && GetOwner ()->GetNumRatchetInboundTags () > 0) ?
 				GetOwner ()->GetNumRatchetInboundTags () : ECIESX25519_MAX_NUM_GENERATED_TAGS);
 			receiveTagset->Expire ();
+			
 			LogPrint (eLogDebug, "Garlic: Next receive tagset ", tagsetID, " created");
+			m_SendReverseKey = true;
 		}
 	}
 
@@ -701,6 +725,8 @@ namespace garlic
 
 	bool ECIESX25519AEADRatchetSession::NewExistingSessionMessage (const uint8_t * payload, size_t len, uint8_t * out, size_t outLen)
 	{
+		auto owner = GetOwner ();
+		if (!owner) return false;
 		uint8_t nonce[12];
 		auto index = m_SendTagset->GetNextIndex ();
 		CreateNonce (index, nonce); // tag's index
@@ -708,8 +734,7 @@ namespace garlic
 		if (!tag)
 		{
 			LogPrint (eLogError, "Garlic: Can't create new ECIES-X25519-AEAD-Ratchet tag for send tagset");
-			if (GetOwner ())
-				GetOwner ()->RemoveECIESx25519Session (m_RemoteStaticKey);
+			owner->RemoveECIESx25519Session (m_RemoteStaticKey);
 			return false;
 		}
 		memcpy (out, &tag, 8);
@@ -717,7 +742,7 @@ namespace garlic
 		// ciphertext = ENCRYPT(k, n, payload, ad)
 		uint8_t key[32];
 		m_SendTagset->GetSymmKey (index, key);
-		if (!i2p::crypto::AEADChaCha20Poly1305 (payload, len, out, 8, key, nonce, out + 8, outLen - 8, true)) // encrypt
+		if (!owner->AEADChaCha20Poly1305Encrypt (payload, len, out, 8, key, nonce, out + 8, outLen - 8))
 		{
 			LogPrint (eLogWarning, "Garlic: Payload section AEAD encryption failed");
 			return false;
@@ -736,33 +761,35 @@ namespace garlic
 		uint8_t * payload = buf + 8;
 		uint8_t key[32];
 		receiveTagset->GetSymmKey (index, key);
-		if (!i2p::crypto::AEADChaCha20Poly1305 (payload, len - 16, buf, 8, key, nonce, payload, len - 16, false)) // decrypt
+		auto owner = GetOwner ();
+		if (!owner) return true; // drop message
+		
+		if (!owner->AEADChaCha20Poly1305Decrypt (payload, len - 16, buf, 8, key, nonce, payload, len - 16))
 		{
 			LogPrint (eLogWarning, "Garlic: Payload section AEAD decryption failed");
 			return false;
 		}
 		HandlePayload (payload, len - 16, receiveTagset, index);
-		if (GetOwner ())
+		
+		int moreTags = 0;
+		if (owner->GetNumRatchetInboundTags () > 0) // override in settings?
 		{
-			int moreTags = 0;
-			if (GetOwner ()->GetNumRatchetInboundTags () > 0) // override in settings?
-			{
-				if (receiveTagset->GetNextIndex () - index < GetOwner ()->GetNumRatchetInboundTags ()/2)
-					moreTags = GetOwner ()->GetNumRatchetInboundTags ();
-				index -= GetOwner ()->GetNumRatchetInboundTags (); // trim behind
-			}
-			else
-			{
-				moreTags = ECIESX25519_MIN_NUM_GENERATED_TAGS + (index >> 2); // N/4
-				if (moreTags > ECIESX25519_MAX_NUM_GENERATED_TAGS) moreTags = ECIESX25519_MAX_NUM_GENERATED_TAGS;
-				moreTags -= (receiveTagset->GetNextIndex () - index);
-				index -= ECIESX25519_MAX_NUM_GENERATED_TAGS; // trim behind
-			}
-			if (moreTags > 0)
-				GenerateMoreReceiveTags (receiveTagset, moreTags);
-			if (index > 0)
-				receiveTagset->SetTrimBehind (index);
+			if (receiveTagset->GetNextIndex () - index < owner->GetNumRatchetInboundTags ()/2)
+				moreTags = owner->GetNumRatchetInboundTags ();
+			index -= owner->GetNumRatchetInboundTags (); // trim behind
 		}
+		else
+		{
+			moreTags = (receiveTagset->GetTagSetID () > 0) ? ECIESX25519_MAX_NUM_GENERATED_TAGS : // for non first tagset
+				(ECIESX25519_MIN_NUM_GENERATED_TAGS + (index >> 1)); // N/2
+			if (moreTags > ECIESX25519_MAX_NUM_GENERATED_TAGS) moreTags = ECIESX25519_MAX_NUM_GENERATED_TAGS;
+			moreTags -= (receiveTagset->GetNextIndex () - index);
+			index -= ECIESX25519_MAX_NUM_GENERATED_TAGS; // trim behind
+		}
+		if (moreTags > 0)
+			GenerateMoreReceiveTags (receiveTagset, moreTags);
+		if (index > 0)
+			receiveTagset->SetTrimBehind (index);
 		return true;
 	}
 
@@ -776,10 +803,10 @@ namespace garlic
 				m_State = eSessionStateEstablished;
 				m_NSRSendTagset = nullptr;
 				m_EphemeralKeys = nullptr;
-#if (__cplusplus >= 201703L) // C++ 17 or higher
 				[[fallthrough]];
-#endif
 			case eSessionStateEstablished:
+				if (m_SendReverseKey && receiveTagset->GetTagSetID () == m_NextReceiveRatchet->GetReceiveTagSetID ())
+					m_SendReverseKey = false; // tag received on new tagset	
 				if (receiveTagset->IsNS ())
 				{
 					// our of sequence NSR
@@ -857,6 +884,7 @@ namespace garlic
 	{
 		uint64_t ts = i2p::util::GetMillisecondsSinceEpoch ();
 		size_t payloadLen = 0;
+		bool sendAckRequest = false;
 		if (first) payloadLen += 7;// datatime
 		if (msg)
 		{
@@ -875,13 +903,28 @@ namespace garlic
 			payloadLen += leaseSet->GetBufferLen () + DATABASE_STORE_HEADER_SIZE + 13;
 			if (!first)
 			{
-				// ack request
+				// ack request for LeaseSet
+				m_AckRequestMsgID = m_SendTagset->GetMsgID ();
+				sendAckRequest = true;
+				// update LeaseSet status
 				SetLeaseSetUpdateStatus (eLeaseSetSubmitted);
-				SetLeaseSetUpdateMsgID (m_SendTagset->GetNextIndex ());
+				SetLeaseSetUpdateMsgID (m_AckRequestMsgID);
 				SetLeaseSetSubmissionTime (ts);
-				payloadLen += 4;
 			}
 		}
+		if (!sendAckRequest && !first &&
+		    ((!m_AckRequestMsgID && ts > m_LastAckRequestSendTime + m_AckRequestInterval) || // regular request
+		     (m_AckRequestMsgID && ts > m_LastAckRequestSendTime + LEASESET_CONFIRMATION_TIMEOUT))) // previous request failed. try again
+		{	
+			// not LeaseSet
+			m_AckRequestMsgID = m_SendTagset->GetMsgID ();
+			if (m_AckRequestMsgID)
+			{	
+				m_AckRequestNumAttempts++;
+				sendAckRequest = true;
+			}	
+		}	
+		if (sendAckRequest) payloadLen += 4;
 		if (m_AckRequests.size () > 0)
 			payloadLen += m_AckRequests.size ()*4 + 3;
 		if (m_SendReverseKey)
@@ -933,16 +976,15 @@ namespace garlic
 			}
 			// LeaseSet
 			if (leaseSet)
-			{
 				offset += CreateLeaseSetClove (leaseSet, ts, payload + offset, payloadLen - offset);
-				if (!first)
-				{
-					// ack request
-					payload[offset] = eECIESx25519BlkAckRequest; offset++;
-					htobe16buf (payload + offset, 1); offset += 2;
-					payload[offset] = 0; offset++; // flags
-				}
-			}
+			// ack request
+			if (sendAckRequest)
+			{
+				payload[offset] = eECIESx25519BlkAckRequest; offset++;
+				htobe16buf (payload + offset, 1); offset += 2;
+				payload[offset] = 0; offset++; // flags
+				m_LastAckRequestSendTime = ts;
+			}	
 			// msg
 			if (msg)
 				offset += CreateGarlicClove (msg, payload + offset, payloadLen - offset);
@@ -977,7 +1019,6 @@ namespace garlic
 					memcpy (payload + offset, m_NextReceiveRatchet->key->GetPublicKey (), 32);
 					offset += 32; // public key
 				}
-				m_SendReverseKey = false;
 			}
 			if (m_SendForwardKey)
 			{
@@ -1073,6 +1114,8 @@ namespace garlic
 	bool ECIESX25519AEADRatchetSession::CheckExpired (uint64_t ts)
 	{
 		CleanupUnconfirmedLeaseSet (ts);
+		if (!m_Destination && ts > m_LastActivityTimestamp + ECIESX25519_SESSION_CREATE_TIMEOUT) return true; // m_LastActivityTimestamp is NS receive time 
+		if (m_State != eSessionStateEstablished && m_SessionCreatedTimestamp && ts > m_SessionCreatedTimestamp + ECIESX25519_SESSION_ESTABLISH_TIMEOUT) return true; 
 		return ts > m_LastActivityTimestamp + ECIESX25519_RECEIVE_EXPIRATION_TIMEOUT && // seconds
 			ts*1000 > m_LastSentTimestamp + ECIESX25519_SEND_EXPIRATION_TIMEOUT*1000; // milliseconds
 	}

libi2pd/ECIESX25519AEADRatchetSession.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -30,10 +30,14 @@ namespace garlic
 	const int ECIESX25519_SEND_INACTIVITY_TIMEOUT = 5000; // number of milliseconds we can send empty(pyaload only) packet after
 	const int ECIESX25519_SEND_EXPIRATION_TIMEOUT = 480; // in seconds
 	const int ECIESX25519_RECEIVE_EXPIRATION_TIMEOUT = 600; // in seconds
-	const int ECIESX25519_PREVIOUS_TAGSET_EXPIRATION_TIMEOUT = 180; // 180
+	const int ECIESX25519_SESSION_CREATE_TIMEOUT = 3; // in seconds, NSR must be send after NS received
+	const int ECIESX25519_SESSION_ESTABLISH_TIMEOUT = 15; // in seconds 
+	const int ECIESX25519_PREVIOUS_TAGSET_EXPIRATION_TIMEOUT = 180; // in seconds
+	const int ECIESX25519_DEFAULT_ACK_REQUEST_INTERVAL = 33000; // in milliseconds
+	const int ECIESX25519_ACK_REQUEST_MAX_NUM_ATTEMPTS = 3;
 	const int ECIESX25519_TAGSET_MAX_NUM_TAGS = 8192; // number of tags we request new tagset after
 	const int ECIESX25519_MIN_NUM_GENERATED_TAGS = 24;
-	const int ECIESX25519_MAX_NUM_GENERATED_TAGS = 320;
+	const int ECIESX25519_MAX_NUM_GENERATED_TAGS = 800;
 	const int ECIESX25519_NSR_NUM_GENERATED_TAGS = 12;
 
 	const size_t ECIESX25519_OPTIMAL_PAYLOAD_SIZE = 1912; // 1912 = 1956 /* to fit 2 tunnel messages */
@@ -57,6 +61,8 @@ namespace garlic
 			int GetTagSetID () const { return m_TagSetID; };
 			void SetTagSetID (int tagsetID) { m_TagSetID = tagsetID; };
 
+			uint32_t GetMsgID () const { return (m_TagSetID << 16) + m_NextIndex; }; // (tagsetid << 16) + N
+			
 		private:
 
 			i2p::data::Tag<64> m_SessionTagKeyData;
@@ -149,6 +155,7 @@ namespace garlic
 			std::shared_ptr<i2p::crypto::X25519Keys> key;
 			uint8_t remote[32]; // last remote public key
 			bool newKey = true;
+			int GetReceiveTagSetID () const { return newKey ? (2*keyID + 1) : 2*keyID; }
 		};
 
 		public:
@@ -157,14 +164,14 @@ namespace garlic
 			~ECIESX25519AEADRatchetSession ();
 
 			bool HandleNextMessage (uint8_t * buf, size_t len, std::shared_ptr<ReceiveRatchetTagSet> receiveTagset, int index = 0);
-			std::shared_ptr<I2NPMessage> WrapSingleMessage (std::shared_ptr<const I2NPMessage> msg);
+			std::shared_ptr<I2NPMessage> WrapSingleMessage (std::shared_ptr<const I2NPMessage> msg) override;
 			std::shared_ptr<I2NPMessage> WrapOneTimeMessage (std::shared_ptr<const I2NPMessage> msg);
 
 			const uint8_t * GetRemoteStaticKey () const { return m_RemoteStaticKey; }
 			void SetRemoteStaticKey (const uint8_t * key) { memcpy (m_RemoteStaticKey, key, 32); }
 
 			void Terminate () { m_IsTerminated = true; }
-			void SetDestination (const i2p::data::IdentHash& dest) // TODO:
+			void SetDestination (const i2p::data::IdentHash& dest)
 			{
 				if (!m_Destination) m_Destination.reset (new i2p::data::IdentHash (dest));
 			}
@@ -173,18 +180,21 @@ namespace garlic
 			bool CanBeRestarted (uint64_t ts) const { return ts > m_SessionCreatedTimestamp + ECIESX25519_RESTART_TIMEOUT; }
 			bool IsInactive (uint64_t ts) const { return ts > m_LastActivityTimestamp + ECIESX25519_INACTIVITY_TIMEOUT && CanBeRestarted (ts); }
 
-			bool IsRatchets () const { return true; };
-			bool IsReadyToSend () const { return m_State != eSessionStateNewSessionSent; };
-			bool IsTerminated () const { return m_IsTerminated; }
-			uint64_t GetLastActivityTimestamp () const { return m_LastActivityTimestamp; };
-
+			bool IsRatchets () const override { return true; };
+			bool IsReadyToSend () const override { return m_State != eSessionStateNewSessionSent; };
+			bool IsTerminated () const override { return m_IsTerminated; }
+			uint64_t GetLastActivityTimestamp () const override { return m_LastActivityTimestamp; };
+			void SetAckRequestInterval (int interval) override { m_AckRequestInterval = interval; };
+			bool CleanupUnconfirmedTags () override; // return true if unaswered Ack requests, called from I2CP
+			
 		protected:
 
 			i2p::crypto::NoiseSymmetricState& GetNoiseState () { return *this; };
 			void SetNoiseState (const i2p::crypto::NoiseSymmetricState& state) { GetNoiseState () = state; };
 			void CreateNonce (uint64_t seqn, uint8_t * nonce);
 			void HandlePayload (const uint8_t * buf, size_t len, const std::shared_ptr<ReceiveRatchetTagSet>& receiveTagset, int index);
-
+			bool MessageConfirmed (uint32_t msgID) override;
+			
 		private:
 
 			bool GenerateEphemeralKeysAndEncode (uint8_t * buf); // buf is 32 bytes
@@ -217,12 +227,17 @@ namespace garlic
 			uint64_t m_SessionCreatedTimestamp = 0, m_LastActivityTimestamp = 0, // incoming (in seconds)
 				m_LastSentTimestamp = 0; // in milliseconds
 			std::shared_ptr<RatchetTagSet> m_SendTagset, m_NSRSendTagset;
-			std::unique_ptr<i2p::data::IdentHash> m_Destination;// TODO: might not need it
-			std::list<std::pair<uint16_t, int> > m_AckRequests; // (tagsetid, index)
+			std::unique_ptr<i2p::data::IdentHash> m_Destination;// must be set for NS if outgoing and NSR if incoming
+			std::list<std::pair<uint16_t, int> > m_AckRequests; // incoming (tagsetid, index)
 			bool m_SendReverseKey = false, m_SendForwardKey = false, m_IsTerminated = false;
 			std::unique_ptr<DHRatchet> m_NextReceiveRatchet, m_NextSendRatchet;
 			uint8_t m_PaddingSizes[32], m_NextPaddingSize;
 
+			uint64_t m_LastAckRequestSendTime = 0; // milliseconds
+			uint32_t m_AckRequestMsgID = 0; 
+			int m_AckRequestNumAttempts = 0;
+			int m_AckRequestInterval = ECIESX25519_DEFAULT_ACK_REQUEST_INTERVAL; // milliseconds
+			
 		public:
 
 			// for HTTP only

libi2pd/Ed25519.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2023, The PurpleI2P Project
+* Copyright (c) 2013-2024, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -457,86 +457,6 @@ namespace crypto
 		}
 	}
 
-#if !OPENSSL_X25519
-	BIGNUM * Ed25519::ScalarMul (const BIGNUM * u, const BIGNUM * k, BN_CTX * ctx) const
-	{
-		BN_CTX_start (ctx);
-		auto x1 = BN_CTX_get (ctx); BN_copy (x1, u);
-		auto x2 = BN_CTX_get (ctx); BN_one (x2);
-		auto z2 = BN_CTX_get (ctx); BN_zero (z2);
-		auto x3 = BN_CTX_get (ctx); BN_copy (x3, u);
-		auto z3 = BN_CTX_get (ctx); BN_one (z3);
-		auto c121666 = BN_CTX_get (ctx); BN_set_word (c121666, 121666);
-		auto tmp0 = BN_CTX_get (ctx); auto tmp1 = BN_CTX_get (ctx);
-		unsigned int swap = 0;
-		auto bits = BN_num_bits (k);
-		while(bits)
-		{
-			--bits;
-			auto k_t = BN_is_bit_set(k, bits) ? 1 : 0;
-			swap ^= k_t;
-			if (swap)
-			{
-				std::swap (x2, x3);
-				std::swap (z2, z3);
-			}
-			swap = k_t;
-			BN_mod_sub(tmp0, x3, z3, q, ctx);
-			BN_mod_sub(tmp1, x2, z2, q, ctx);
-			BN_mod_add(x2, x2, z2, q, ctx);
-			BN_mod_add(z2, x3, z3, q, ctx);
-			BN_mod_mul(z3, tmp0, x2, q, ctx);
-			BN_mod_mul(z2, z2, tmp1, q, ctx);
-			BN_mod_sqr(tmp0, tmp1, q, ctx);
-			BN_mod_sqr(tmp1, x2, q, ctx);
-			BN_mod_add(x3, z3, z2, q, ctx);
-			BN_mod_sub(z2, z3, z2, q, ctx);
-			BN_mod_mul(x2, tmp1, tmp0, q, ctx);
-			BN_mod_sub(tmp1, tmp1, tmp0, q, ctx);
-			BN_mod_sqr(z2, z2, q, ctx);
-			BN_mod_mul(z3, tmp1, c121666, q, ctx);
-			BN_mod_sqr(x3, x3, q, ctx);
-			BN_mod_add(tmp0, tmp0, z3, q, ctx);
-			BN_mod_mul(z3, x1, z2, q, ctx);
-			BN_mod_mul(z2, tmp1, tmp0, q, ctx);
-		}
-		if (swap)
-		{
-			std::swap (x2, x3);
-			std::swap (z2, z3);
-		}
-		BN_mod_inverse (z2, z2, q, ctx);
-		BIGNUM * res = BN_new (); // not from ctx
-		BN_mod_mul(res, x2, z2, q, ctx);
-		BN_CTX_end (ctx);
-		return res;
-	}
-
-	void Ed25519::ScalarMul (const uint8_t * p, const uint8_t * e, uint8_t * buf, BN_CTX * ctx) const
-	{
-		BIGNUM * p1 = DecodeBN<32> (p);
-		uint8_t k[32];
-		memcpy (k, e, 32);
-		k[0] &= 248; k[31] &= 127; k[31] |= 64;
-		BIGNUM * n = DecodeBN<32> (k);
-		BIGNUM * q1 = ScalarMul (p1, n, ctx);
-		EncodeBN (q1, buf, 32);
-		BN_free (p1); BN_free (n); BN_free (q1);
-	}
-
-	void Ed25519::ScalarMulB (const uint8_t * e, uint8_t * buf, BN_CTX * ctx) const
-	{
-		BIGNUM *p1 = BN_new (); BN_set_word (p1, 9);
-		uint8_t k[32];
-		memcpy (k, e, 32);
-		k[0] &= 248; k[31] &= 127; k[31] |= 64;
-		BIGNUM * n = DecodeBN<32> (k);
-		BIGNUM * q1 = ScalarMul (p1, n, ctx);
-		EncodeBN (q1, buf, 32);
-		BN_free (p1); BN_free (n); BN_free (q1);
-	}
-#endif
-
 	void Ed25519::BlindPublicKey (const uint8_t * pub, const uint8_t * seed, uint8_t * blinded)
 	{
 		BN_CTX * ctx = BN_CTX_new ();

libi2pd/Ed25519.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2020, The PurpleI2P Project
+* Copyright (c) 2013-2024, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -84,10 +84,7 @@ namespace crypto
 			EDDSAPoint GeneratePublicKey (const uint8_t * expandedPrivateKey, BN_CTX * ctx) const;
 			EDDSAPoint DecodePublicKey (const uint8_t * buf, BN_CTX * ctx) const;
 			void EncodePublicKey (const EDDSAPoint& publicKey, uint8_t * buf, BN_CTX * ctx) const;
-#if !OPENSSL_X25519
-			void ScalarMul (const uint8_t * p, const uint8_t * e, uint8_t * buf, BN_CTX * ctx) const; // p is point, e is number for x25519
-			void ScalarMulB (const uint8_t * e, uint8_t * buf, BN_CTX * ctx) const;
-#endif
+
 			void BlindPublicKey (const uint8_t * pub, const uint8_t * seed, uint8_t * blinded); // for encrypted LeaseSet2, pub - 32, seed - 64, blinded - 32
 			void BlindPrivateKey (const uint8_t * priv, const uint8_t * seed, uint8_t * blindedPriv, uint8_t * blindedPub); // for encrypted LeaseSet2, pub - 32, seed - 64, blinded - 32
 
@@ -115,11 +112,6 @@ namespace crypto
 			BIGNUM * DecodeBN (const uint8_t * buf) const;
 			void EncodeBN (const BIGNUM * bn, uint8_t * buf, size_t len) const;
 
-#if !OPENSSL_X25519
-			// for x25519
-			BIGNUM * ScalarMul (const BIGNUM * p, const BIGNUM * e, BN_CTX * ctx) const;
-#endif
-
 		private:
 
 			BIGNUM * q, * l, * d, * I;

libi2pd/FS.cpp

@@ -7,10 +7,11 @@
 */
 
 #include <algorithm>
-#include <boost/filesystem.hpp>
 
 #if defined(MAC_OSX)
+#if !STD_FILESYSTEM
 #include <boost/system/system_error.hpp>
+#endif
 #include <TargetConditionals.h>
 #endif
 
@@ -25,6 +26,14 @@
 #include "Log.h"
 #include "Garlic.h"
 
+#if STD_FILESYSTEM
+#include <filesystem>
+namespace fs_lib = std::filesystem;
+#else
+#include <boost/filesystem.hpp>
+namespace fs_lib = boost::filesystem;
+#endif
+
 namespace i2p {
 namespace fs {
 	std::string appName = "i2pd";
@@ -54,15 +63,17 @@ namespace fs {
 
 	const std::string GetUTF8DataDir () {
 #ifdef _WIN32
-#if (BOOST_VERSION >= 108500)
-		boost::filesystem::path path (dataDir);
-#else
-		boost::filesystem::wpath path (dataDir);
-#endif
-		auto loc = boost::filesystem::path::imbue(std::locale( std::locale(), new std::codecvt_utf8_utf16<wchar_t>() ) ); // convert path to UTF-8
-		auto dataDirUTF8 = path.string();
-		boost::filesystem::path::imbue(loc); // Return locale settings back
-		return dataDirUTF8;
+		int size = MultiByteToWideChar(CP_ACP, 0,
+			dataDir.c_str(), dataDir.size(), nullptr, 0);
+		std::wstring utf16Str(size, L'\0');
+		MultiByteToWideChar(CP_ACP, 0,
+			dataDir.c_str(), dataDir.size(), &utf16Str[0], size);
+		int utf8Size = WideCharToMultiByte(CP_UTF8, 0,
+			utf16Str.c_str(), utf16Str.size(), nullptr, 0, nullptr, nullptr);
+		std::string utf8Str(utf8Size, '\0');
+		WideCharToMultiByte(CP_UTF8, 0,
+			utf16Str.c_str(), utf16Str.size(), &utf8Str[0], utf8Size, nullptr, nullptr);
+		return utf8Str;
 #else
 		return dataDir; // linux, osx, android uses UTF-8 by default
 #endif
@@ -91,10 +102,10 @@ namespace fs {
 			}
 			else
 			{
-#if (BOOST_VERSION >= 108500)
-				dataDir = boost::filesystem::path(commonAppData).string() + "\\" + appName;
+#if ((BOOST_VERSION >= 108500) || STD_FILESYSTEM)
+				dataDir = fs_lib::path(commonAppData).string() + "\\" + appName;
 #else
-				dataDir = boost::filesystem::wpath(commonAppData).string() + "\\" + appName;
+				dataDir = fs_lib::wpath(commonAppData).string() + "\\" + appName;
 #endif
 			}
 #else
@@ -120,14 +131,14 @@ namespace fs {
 		}
 		else
 		{
-#if (BOOST_VERSION >= 108500)
-			auto execPath = boost::filesystem::path(localAppData).parent_path();
+#if ((BOOST_VERSION >= 108500) || STD_FILESYSTEM)
+			auto execPath = fs_lib::path(localAppData).parent_path();
 #else
-			auto execPath = boost::filesystem::wpath(localAppData).parent_path();
+			auto execPath = fs_lib::wpath(localAppData).parent_path();
 #endif
 
 			// if config file exists in .exe's folder use it
-			if(boost::filesystem::exists(execPath/"i2pd.conf")) // TODO: magic string
+			if(fs_lib::exists(execPath/"i2pd.conf")) // TODO: magic string
 			{
 				dataDir = execPath.string ();
 			} else // otherwise %appdata%
@@ -143,10 +154,10 @@ namespace fs {
 				}
 				else
 				{
-#if (BOOST_VERSION >= 108500)
-					dataDir = boost::filesystem::path(localAppData).string() + "\\" + appName;
+#if ((BOOST_VERSION >= 108500) || STD_FILESYSTEM)
+					dataDir = fs_lib::path(localAppData).string() + "\\" + appName;
 #else
-					dataDir = boost::filesystem::wpath(localAppData).string() + "\\" + appName;
+					dataDir = fs_lib::wpath(localAppData).string() + "\\" + appName;
 #endif
 				}
 			}
@@ -169,7 +180,7 @@ namespace fs {
 #if defined(ANDROID)
 		const char * ext = getenv("EXTERNAL_STORAGE");
 		if (!ext) ext = "/sdcard";
-		if (boost::filesystem::exists(ext))
+		if (fs_lib::exists(ext))
 		{
 			dataDir = std::string (ext) + "/" + appName;
 			return;
@@ -202,16 +213,16 @@ namespace fs {
 	}
 
 	bool Init() {
-		if (!boost::filesystem::exists(dataDir))
-			boost::filesystem::create_directory(dataDir);
+		if (!fs_lib::exists(dataDir))
+			fs_lib::create_directory(dataDir);
 
 		std::string destinations = DataDirPath("destinations");
-		if (!boost::filesystem::exists(destinations))
-			boost::filesystem::create_directory(destinations);
+		if (!fs_lib::exists(destinations))
+			fs_lib::create_directory(destinations);
 
 		std::string tags = DataDirPath("tags");
-		if (!boost::filesystem::exists(tags))
-			boost::filesystem::create_directory(tags);
+		if (!fs_lib::exists(tags))
+			fs_lib::create_directory(tags);
 		else
 			i2p::garlic::CleanUpTagsFiles ();
 
@@ -219,13 +230,13 @@ namespace fs {
 	}
 
 	bool ReadDir(const std::string & path, std::vector<std::string> & files) {
-		if (!boost::filesystem::exists(path))
+		if (!fs_lib::exists(path))
 			return false;
-		boost::filesystem::directory_iterator it(path);
-		boost::filesystem::directory_iterator end;
+		fs_lib::directory_iterator it(path);
+		fs_lib::directory_iterator end;
 
 		for ( ; it != end; it++) {
-			if (!boost::filesystem::is_regular_file(it->status()))
+			if (!fs_lib::is_regular_file(it->status()))
 				continue;
 			files.push_back(it->path().string());
 		}
@@ -234,29 +245,42 @@ namespace fs {
 	}
 
 	bool Exists(const std::string & path) {
-		return boost::filesystem::exists(path);
+		return fs_lib::exists(path);
 	}
 
 	uint32_t GetLastUpdateTime (const std::string & path)
 	{
-		if (!boost::filesystem::exists(path))
+		if (!fs_lib::exists(path))
 			return 0;
+#if STD_FILESYSTEM
+		std::error_code ec;
+		auto t = std::filesystem::last_write_time (path, ec);
+		if (ec) return 0;
+/*#if __cplusplus >= 202002L // C++ 20 or higher
+		const auto sctp = std::chrono::clock_cast<std::chrono::system_clock>(t);
+#else	*/	// TODO: wait until implemented
+		const auto sctp = std::chrono::time_point_cast<std::chrono::system_clock::duration>(
+		    t - decltype(t)::clock::now() + std::chrono::system_clock::now());
+/*#endif */
+		return std::chrono::system_clock::to_time_t(sctp);
+#else
 		boost::system::error_code ec;
 		auto t = boost::filesystem::last_write_time (path, ec);
 		return ec ? 0 : t;
+#endif
 	}
 
 	bool Remove(const std::string & path) {
-		if (!boost::filesystem::exists(path))
+		if (!fs_lib::exists(path))
 			return false;
-		return boost::filesystem::remove(path);
+		return fs_lib::remove(path);
 	}
 
 	bool CreateDirectory (const std::string& path)
 	{
-		if (boost::filesystem::exists(path) && boost::filesystem::is_directory (boost::filesystem::status (path)))
+		if (fs_lib::exists(path) && fs_lib::is_directory (fs_lib::status (path)))
 			return true;
-		return boost::filesystem::create_directory(path);
+		return fs_lib::create_directory(path);
 	}
 
 	void HashedStorage::SetPlace(const std::string &path) {
@@ -264,18 +288,18 @@ namespace fs {
 	}
 
 	bool HashedStorage::Init(const char * chars, size_t count) {
-		if (!boost::filesystem::exists(root)) {
-			boost::filesystem::create_directories(root);
+		if (!fs_lib::exists(root)) {
+			fs_lib::create_directories(root);
 		}
 
 		for (size_t i = 0; i < count; i++) {
 			auto p = root + i2p::fs::dirSep + prefix1 + chars[i];
-			if (boost::filesystem::exists(p))
+			if (fs_lib::exists(p))
 				continue;
 #if TARGET_OS_SIMULATOR
 			// ios simulator fs says it is case sensitive, but it is not
 			boost::system::error_code ec;
-			if (boost::filesystem::create_directory(p, ec))
+			if (fs_lib::create_directory(p, ec))
 				continue;
 			switch (ec.value()) {
 				case boost::system::errc::file_exists:
@@ -285,7 +309,7 @@ namespace fs {
 					throw boost::system::system_error( ec, __func__ );
 			}
 #else
-			if (boost::filesystem::create_directory(p))
+			if (fs_lib::create_directory(p))
 				continue; /* ^ throws exception on failure */
 #endif
 			return false;
@@ -308,9 +332,9 @@ namespace fs {
 
 	void HashedStorage::Remove(const std::string & ident) {
 		std::string path = Path(ident);
-		if (!boost::filesystem::exists(path))
+		if (!fs_lib::exists(path))
 			return;
-		boost::filesystem::remove(path);
+		fs_lib::remove(path);
 	}
 
 	void HashedStorage::Traverse(std::vector<std::string> & files) {
@@ -321,12 +345,12 @@ namespace fs {
 
 	void HashedStorage::Iterate(FilenameVisitor v)
 	{
-		boost::filesystem::path p(root);
-		boost::filesystem::recursive_directory_iterator it(p);
-		boost::filesystem::recursive_directory_iterator end;
+		fs_lib::path p(root);
+		fs_lib::recursive_directory_iterator it(p);
+		fs_lib::recursive_directory_iterator end;
 
 		for ( ; it != end; it++) {
-			if (!boost::filesystem::is_regular_file( it->status() ))
+			if (!fs_lib::is_regular_file( it->status() ))
 				continue;
 			const std::string & t = it->path().string();
 			v(t);

libi2pd/FS.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2020, The PurpleI2P Project
+* Copyright (c) 2013-2024, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -15,6 +15,16 @@
 #include <sstream>
 #include <functional>
 
+#ifndef STD_FILESYSTEM
+#	if (_WIN32 && __GNUG__) // MinGW GCC somehow incorrectly converts paths
+#		define STD_FILESYSTEM 0
+#	elif (!TARGET_OS_SIMULATOR && __has_include(<filesystem>)) // supports std::filesystem
+#		define STD_FILESYSTEM 1
+#	else
+#		define STD_FILESYSTEM 0
+#	endif
+#endif
+
 namespace i2p {
 namespace fs {
 	extern std::string dirSep;

libi2pd/Family.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2023, The PurpleI2P Project
+* Copyright (c) 2013-2024, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -7,7 +7,6 @@
 */
 
 #include <string.h>
-#include <openssl/evp.h>
 #include <openssl/ssl.h>
 #include "Crypto.h"
 #include "FS.h"
@@ -25,6 +24,8 @@ namespace data
 
 	Families::~Families ()
 	{
+		for (auto it : m_SigningKeys)
+			if (it.second.first) EVP_PKEY_free (it.second.first);
 	}
 
 	void Families::LoadCertificate (const std::string& filename)
@@ -47,48 +48,16 @@ namespace data
 					cn += 3;
 					char * family = strstr (cn, ".family");
 					if (family) family[0] = 0;
-				}
-				auto pkey = X509_get_pubkey (cert);
-				int keyType = EVP_PKEY_base_id (pkey);
-				switch (keyType)
-				{
-					case EVP_PKEY_DSA:
-						// TODO:
-					break;
-					case EVP_PKEY_EC:
-					{
-						EC_KEY * ecKey = EVP_PKEY_get1_EC_KEY (pkey);
-						if (ecKey)
+					auto pkey = X509_get_pubkey (cert);
+					if (pkey)
+					{	
+						if (!m_SigningKeys.emplace (cn, std::make_pair(pkey, (int)m_SigningKeys.size () + 1)).second)
 						{
-							auto group = EC_KEY_get0_group (ecKey);
-							if (group)
-							{
-								int curve = EC_GROUP_get_curve_name (group);
-								if (curve == NID_X9_62_prime256v1)
-								{
-									uint8_t signingKey[64];
-									BIGNUM * x = BN_new(), * y = BN_new();
-									EC_POINT_get_affine_coordinates_GFp (group,
-										EC_KEY_get0_public_key (ecKey), x, y, NULL);
-									i2p::crypto::bn2buf (x, signingKey, 32);
-									i2p::crypto::bn2buf (y, signingKey + 32, 32);
-									BN_free (x); BN_free (y);
-									verifier = std::make_shared<i2p::crypto::ECDSAP256Verifier>();
-									verifier->SetPublicKey (signingKey);
-								}
-								else
-									LogPrint (eLogWarning, "Family: elliptic curve ", curve, " is not supported");
-							}
-							EC_KEY_free (ecKey);
-						}
-						break;
-					}
-					default:
-						LogPrint (eLogWarning, "Family: Certificate key type ", keyType, " is not supported");
+							EVP_PKEY_free (pkey);
+							LogPrint (eLogError, "Family: Duplicated family name ", cn);
+						}	
+					}	
 				}
-				EVP_PKEY_free (pkey);
-				if (verifier && cn)
-					m_SigningKeys.emplace (cn, std::make_pair(verifier, (int)m_SigningKeys.size () + 1));
 			}
 			SSL_free (ssl);
 		}
@@ -130,14 +99,22 @@ namespace data
 			LogPrint (eLogError, "Family: ", family, " is too long");
 			return false;
 		}
-
-		memcpy (buf, family.c_str (), len);
-		memcpy (buf + len, (const uint8_t *)ident, 32);
-		len += 32;
-		Base64ToByteStream (signature, signatureLen, signatureBuf, 64);
 		auto it = m_SigningKeys.find (family);
-		if (it != m_SigningKeys.end ())
-			return it->second.first->Verify (buf, len, signatureBuf);
+		if (it != m_SigningKeys.end () && it->second.first)
+		{	
+			memcpy (buf, family.c_str (), len);
+			memcpy (buf + len, (const uint8_t *)ident, 32);
+			len += 32;
+			auto signatureBufLen = Base64ToByteStream (signature, signatureLen, signatureBuf, 64);
+			if (signatureBufLen)
+			{
+				EVP_MD_CTX * ctx = EVP_MD_CTX_create ();
+				EVP_DigestVerifyInit (ctx, NULL, NULL, NULL, it->second.first);
+				auto ret = EVP_DigestVerify (ctx, signatureBuf, signatureBufLen, buf, len);
+				EVP_MD_CTX_destroy (ctx);
+				return ret;
+			}	
+		}	
 		// TODO: process key
 		return true;
 	}

libi2pd/Family.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2022, The PurpleI2P Project
+* Copyright (c) 2013-2024, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -12,7 +12,7 @@
 #include <map>
 #include <string>
 #include <memory>
-#include "Signature.h"
+#include <openssl/evp.h>
 #include "Identity.h"
 
 namespace i2p
@@ -37,7 +37,7 @@ namespace data
 
 		private:
 
-			std::map<std::string, std::pair<std::shared_ptr<i2p::crypto::Verifier>, FamilyID> > m_SigningKeys; // family -> (verifier, id)
+			std::map<std::string, std::pair<EVP_PKEY *, FamilyID> > m_SigningKeys; // family -> (verification pkey, id)
 	};
 
 	std::string CreateFamilySignature (const std::string& family, const IdentHash& ident);

libi2pd/Garlic.cpp

@@ -45,22 +45,17 @@ namespace garlic
 	{
 		if (!m_SharedRoutingPath) return nullptr;
 		uint32_t ts = i2p::util::GetSecondsSinceEpoch ();
-		if (m_SharedRoutingPath->numTimesUsed >= ROUTING_PATH_MAX_NUM_TIMES_USED ||
-			!m_SharedRoutingPath->outboundTunnel->IsEstablished () ||
+		if (!m_SharedRoutingPath->outboundTunnel->IsEstablished () ||
 			ts*1000LL > m_SharedRoutingPath->remoteLease->endDate ||
 			ts > m_SharedRoutingPath->updateTime + ROUTING_PATH_EXPIRATION_TIMEOUT)
 				m_SharedRoutingPath = nullptr;
-		if (m_SharedRoutingPath) m_SharedRoutingPath->numTimesUsed++;
 		return m_SharedRoutingPath;
 	}
 
 	void GarlicRoutingSession::SetSharedRoutingPath (std::shared_ptr<GarlicRoutingPath> path)
 	{
 		if (path && path->outboundTunnel && path->remoteLease)
-		{
 			path->updateTime = i2p::util::GetSecondsSinceEpoch ();
-			path->numTimesUsed = 0;
-		}
 		else
 			path = nullptr;
 		m_SharedRoutingPath = path;
@@ -165,7 +160,7 @@ namespace garlic
 			uint8_t iv[32]; // IV is first 16 bytes
 			SHA256(elGamal.preIV, 32, iv);
 			m_Destination->Encrypt ((uint8_t *)&elGamal, buf);
-			m_Encryption.SetIV (iv);
+			m_IV = iv;
 			buf += 514;
 			len += 514;
 		}
@@ -175,7 +170,7 @@ namespace garlic
 			memcpy (buf, tag, 32);
 			uint8_t iv[32]; // IV is first 16 bytes
 			SHA256(tag, 32, iv);
-			m_Encryption.SetIV (iv);
+			m_IV = iv;
 			buf += 32;
 			len += 32;
 		}
@@ -215,7 +210,7 @@ namespace garlic
 		size_t rem = blockSize % 16;
 		if (rem)
 			blockSize += (16-rem); //padding
-		m_Encryption.Encrypt(buf, blockSize, buf);
+		m_Encryption.Encrypt(buf, blockSize, m_IV, buf);
 		return blockSize;
 	}
 
@@ -431,7 +426,8 @@ namespace garlic
 	}
 
 	GarlicDestination::GarlicDestination (): m_NumTags (32), // 32 tags by default
-		m_PayloadBuffer (nullptr), m_NumRatchetInboundTags (0) // 0 means standard
+		m_PayloadBuffer (nullptr), m_LastIncomingSessionTimestamp (0), 
+		m_NumRatchetInboundTags (0) // 0 means standard
 	{
 	}
 
@@ -518,8 +514,7 @@ namespace garlic
 				{
 					uint8_t iv[32]; // IV is first 16 bytes
 					SHA256(buf, 32, iv);
-					decryption->SetIV (iv);
-					decryption->Decrypt (buf + 32, length - 32, buf + 32);
+					decryption->Decrypt (buf + 32, length - 32, iv, buf + 32);
 					HandleAESBlock (buf + 32, length - 32, decryption, msg->from);
 					found = true;
 				}
@@ -537,43 +532,23 @@ namespace garlic
 					auto decryption = std::make_shared<AESDecryption>(elGamal.sessionKey);
 					uint8_t iv[32]; // IV is first 16 bytes
 					SHA256(elGamal.preIV, 32, iv);
-					decryption->SetIV (iv);
-					decryption->Decrypt(buf + 514, length - 514, buf + 514);
+					decryption->Decrypt(buf + 514, length - 514, iv, buf + 514);
 					HandleAESBlock (buf + 514, length - 514, decryption, msg->from);
 				}
 				else if (SupportsEncryptionType (i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD))
 				{
 					// otherwise ECIESx25519
-					auto session = std::make_shared<ECIESX25519AEADRatchetSession> (this, false); // incoming
-					if (!session->HandleNextMessage (buf, length, nullptr, 0))
-					{
-						// try to generate more tags for last tagset
-						if (m_LastTagset && (m_LastTagset->GetNextIndex () - m_LastTagset->GetTrimBehind () < 3*ECIESX25519_MAX_NUM_GENERATED_TAGS))
-						{
-							uint64_t missingTag; memcpy (&missingTag, buf, 8);
-							auto maxTags = std::max (m_NumRatchetInboundTags, ECIESX25519_MAX_NUM_GENERATED_TAGS);
-							LogPrint (eLogWarning, "Garlic: Trying to generate more ECIES-X25519-AEAD-Ratchet tags");
-							for (int i = 0; i < maxTags; i++)
-							{
-								auto nextTag = AddECIESx25519SessionNextTag (m_LastTagset);
-								if (!nextTag)
-								{
-									LogPrint (eLogError, "Garlic: Can't create new ECIES-X25519-AEAD-Ratchet tag for last tagset");
-									break;
-								}
-								if (nextTag == missingTag)
-								{
-									LogPrint (eLogDebug, "Garlic: Missing ECIES-X25519-AEAD-Ratchet tag was generated");
-									if (m_LastTagset->HandleNextMessage (buf, length, m_ECIESx25519Tags[nextTag].index))
-										found = true;
-									break;
-								}
-							}
-							if (!found) m_LastTagset = nullptr;
-						}
-						if (!found)
+					auto ts = i2p::util::GetMillisecondsSinceEpoch ();
+					if (ts > m_LastIncomingSessionTimestamp + INCOMING_SESSIONS_MINIMAL_INTERVAL) 
+					{	
+						auto session = std::make_shared<ECIESX25519AEADRatchetSession> (this, false); // incoming
+						if (session->HandleNextMessage (buf, length, nullptr, 0))
+							m_LastIncomingSessionTimestamp = ts;
+						else
 							LogPrint (eLogError, "Garlic: Can't handle ECIES-X25519-AEAD-Ratchet message");
 					}
+					else
+						LogPrint (eLogWarning, "Garlic: Incoming sessions come too often");
 				}
 				else
 					LogPrint (eLogError, "Garlic: Failed to decrypt message");
@@ -588,9 +563,7 @@ namespace garlic
 		auto it = m_ECIESx25519Tags.find (tag);
 		if (it != m_ECIESx25519Tags.end ())
 		{
-			if (it->second.tagset && it->second.tagset->HandleNextMessage (buf, len, it->second.index))
-				m_LastTagset = it->second.tagset;
-			else
+			if (!it->second.tagset || !it->second.tagset->HandleNextMessage (buf, len, it->second.index))
 				LogPrint (eLogError, "Garlic: Can't handle ECIES-X25519-AEAD-Ratchet message");
 			m_ECIESx25519Tags.erase (it);
 			return true;
@@ -771,7 +744,8 @@ namespace garlic
 	}
 
 	std::shared_ptr<GarlicRoutingSession> GarlicDestination::GetRoutingSession (
-		std::shared_ptr<const i2p::data::RoutingDestination> destination, bool attachLeaseSet)
+		std::shared_ptr<const i2p::data::RoutingDestination> destination, bool attachLeaseSet,
+	    bool requestNewIfNotFound)
 	{
 		if (destination->GetEncryptionType () == i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD &&
 			SupportsEncryptionType (i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD))
@@ -786,16 +760,17 @@ namespace garlic
 				if (session->IsInactive (i2p::util::GetSecondsSinceEpoch ()))
 				{
 					LogPrint (eLogDebug, "Garlic: Session restarted");
+					requestNewIfNotFound = true; // it's not a new session
 					session = nullptr;
 				}
 			}
-			if (!session)
+			if (!session && requestNewIfNotFound)
 			{
 				session = std::make_shared<ECIESX25519AEADRatchetSession> (this, true);
 				session->SetRemoteStaticKey (staticKey);
 			}
-			if (destination->IsDestination ())
-				session->SetDestination (destination->GetIdentHash ()); // TODO: remove
+			if (session && destination->IsDestination ())
+				session->SetDestination (destination->GetIdentHash ()); // NS or NSR
 			return session;
 		}
 		else
@@ -898,8 +873,6 @@ namespace garlic
 		}
 		if (numExpiredTags > 0)
 			LogPrint (eLogDebug, "Garlic: ", numExpiredTags, " ECIESx25519 tags expired for ", GetIdentHash().ToBase64 ());
-		if (m_LastTagset && m_LastTagset->IsExpired (ts))
-			m_LastTagset = nullptr;
 	}
 
 	void GarlicDestination::RemoveDeliveryStatusSession (uint32_t msgID)
@@ -933,7 +906,7 @@ namespace garlic
 		}
 	}
 
-	void GarlicDestination::SetLeaseSetUpdated ()
+	void GarlicDestination::SetLeaseSetUpdated (bool post)
 	{
 		{
 			std::unique_lock<std::mutex> l(m_SessionsMutex);
@@ -1036,9 +1009,7 @@ namespace garlic
 			case eGarlicDeliveryTypeDestination:
 				LogPrint (eLogDebug, "Garlic: Type destination");
 				buf += 32; // TODO: check destination
-#if (__cplusplus >= 201703L) // C++ 17 or higher
 				[[fallthrough]];
-#endif
 				// no break here
 			case eGarlicDeliveryTypeLocal:
 			{
@@ -1132,5 +1103,17 @@ namespace garlic
 			m_PayloadBuffer = new uint8_t[I2NP_MAX_MESSAGE_SIZE];
 		return m_PayloadBuffer;
 	}
+
+	bool GarlicDestination::AEADChaCha20Poly1305Encrypt (const uint8_t * msg, size_t msgLen, const uint8_t * ad, size_t adLen,
+		const uint8_t * key, const uint8_t * nonce, uint8_t * buf, size_t len)
+	{
+		return m_Encryptor.Encrypt (msg, msgLen, ad, adLen, key, nonce, buf, len);
+	}
+		
+	bool GarlicDestination::AEADChaCha20Poly1305Decrypt (const uint8_t * msg, size_t msgLen, const uint8_t * ad, size_t adLen,
+		const uint8_t * key, const uint8_t * nonce, uint8_t * buf, size_t len)
+	{
+		return m_Decryptor.Decrypt (msg, msgLen, ad, adLen, key, nonce, buf, len);
+	}	
 }
 }

libi2pd/Garlic.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -51,8 +51,8 @@ namespace garlic
 	const int OUTGOING_TAGS_EXPIRATION_TIMEOUT = 720; // 12 minutes
 	const int OUTGOING_TAGS_CONFIRMATION_TIMEOUT = 10; // 10 seconds
 	const int LEASESET_CONFIRMATION_TIMEOUT = 4000; // in milliseconds
-	const int ROUTING_PATH_EXPIRATION_TIMEOUT = 30; // 30 seconds
-	const int ROUTING_PATH_MAX_NUM_TIMES_USED = 100; // how many times might be used
+	const int ROUTING_PATH_EXPIRATION_TIMEOUT = 120; // in seconds
+	const int INCOMING_SESSIONS_MINIMAL_INTERVAL = 200; // in milliseconds
 
 	struct SessionTag: public i2p::data::Tag<32>
 	{
@@ -89,7 +89,6 @@ namespace garlic
 		std::shared_ptr<const i2p::data::Lease> remoteLease;
 		int rtt; // RTT
 		uint32_t updateTime; // seconds since epoch
-		int numTimesUsed;
 	};
 
 	class GarlicDestination;
@@ -111,13 +110,14 @@ namespace garlic
 			GarlicRoutingSession ();
 			virtual ~GarlicRoutingSession ();
 			virtual std::shared_ptr<I2NPMessage> WrapSingleMessage (std::shared_ptr<const I2NPMessage> msg) = 0;
-			virtual bool CleanupUnconfirmedTags () { return false; }; // for I2CP, override in ElGamalAESSession
+			virtual bool CleanupUnconfirmedTags () { return false; }; // for I2CP, override in ElGamalAESSession and ECIESX25519AEADRatchetSession
 			virtual bool MessageConfirmed (uint32_t msgID);
 			virtual bool IsRatchets () const { return false; };
 			virtual bool IsReadyToSend () const { return true; };
 			virtual bool IsTerminated () const { return !GetOwner (); };
 			virtual uint64_t GetLastActivityTimestamp () const { return 0; }; // non-zero for rathets only
-
+			virtual void SetAckRequestInterval (int interval) {}; // in milliseconds, override in ECIESX25519AEADRatchetSession
+			
 			void SetLeaseSetUpdated ()
 			{
 				if (m_LeaseSetUpdateStatus != eLeaseSetDoNotSend) m_LeaseSetUpdateStatus = eLeaseSetUpdated;
@@ -206,6 +206,7 @@ namespace garlic
 			std::map<uint32_t, std::unique_ptr<UnconfirmedTags> > m_UnconfirmedTagsMsgs; // msgID->tags
 
 			i2p::crypto::CBCEncryption m_Encryption;
+			i2p::data::Tag<16> m_IV;
 
 		public:
 
@@ -236,11 +237,17 @@ namespace garlic
 			int GetNumTags () const { return m_NumTags; };
 			void SetNumRatchetInboundTags (int numTags) { m_NumRatchetInboundTags = numTags; };
 			int GetNumRatchetInboundTags () const { return m_NumRatchetInboundTags; };
-			std::shared_ptr<GarlicRoutingSession> GetRoutingSession (std::shared_ptr<const i2p::data::RoutingDestination> destination, bool attachLeaseSet);
+			std::shared_ptr<GarlicRoutingSession> GetRoutingSession (std::shared_ptr<const i2p::data::RoutingDestination> destination,
+				bool attachLeaseSet, bool requestNewIfNotFound = true);
 			void CleanupExpiredTags ();
 			void RemoveDeliveryStatusSession (uint32_t msgID);
 			std::shared_ptr<I2NPMessage> WrapMessageForRouter (std::shared_ptr<const i2p::data::RouterInfo> router,
 				std::shared_ptr<I2NPMessage> msg);
+			
+			bool AEADChaCha20Poly1305Encrypt (const uint8_t * msg, size_t msgLen, const uint8_t * ad, size_t adLen,
+				const uint8_t * key, const uint8_t * nonce, uint8_t * buf, size_t len); 
+			bool AEADChaCha20Poly1305Decrypt (const uint8_t * msg, size_t msgLen, const uint8_t * ad, size_t adLen,
+				const uint8_t * key, const uint8_t * nonce, uint8_t * buf, size_t len); 
 
 			void AddSessionKey (const uint8_t * key, const uint8_t * tag); // one tag
 			void AddECIESx25519Key (const uint8_t * key, uint64_t tag); // one tag
@@ -255,7 +262,7 @@ namespace garlic
 
 			virtual void ProcessGarlicMessage (std::shared_ptr<I2NPMessage> msg);
 			virtual void ProcessDeliveryStatusMessage (std::shared_ptr<I2NPMessage> msg);
-			virtual void SetLeaseSetUpdated ();
+			virtual void SetLeaseSetUpdated (bool post = false);
 
 			virtual std::shared_ptr<const i2p::data::LocalLeaseSet> GetLeaseSet () = 0; // TODO
 			virtual std::shared_ptr<i2p::tunnel::TunnelPool> GetTunnelPool () const = 0;
@@ -286,15 +293,18 @@ namespace garlic
 			std::unordered_map<i2p::data::IdentHash, ElGamalAESSessionPtr> m_Sessions;
 			std::unordered_map<i2p::data::Tag<32>, ECIESX25519AEADRatchetSessionPtr> m_ECIESx25519Sessions; // static key -> session
 			uint8_t * m_PayloadBuffer; // for ECIESX25519AEADRatchet
+			uint64_t m_LastIncomingSessionTimestamp; // in milliseconds
 			// incoming
 			int m_NumRatchetInboundTags;
 			std::unordered_map<SessionTag, std::shared_ptr<AESDecryption>, std::hash<i2p::data::Tag<32> > > m_Tags;
 			std::unordered_map<uint64_t, ECIESX25519AEADRatchetIndexTagset> m_ECIESx25519Tags; // session tag -> session
-			ReceiveRatchetTagSetPtr m_LastTagset; // tagset last message came for
 			// DeliveryStatus
 			std::mutex m_DeliveryStatusSessionsMutex;
 			std::unordered_map<uint32_t, GarlicRoutingSessionPtr> m_DeliveryStatusSessions; // msgID -> session
-
+			// encryption
+			i2p::crypto::AEADChaCha20Poly1305Encryptor m_Encryptor;
+			i2p::crypto::AEADChaCha20Poly1305Decryptor m_Decryptor;
+			
 		public:
 
 			// for HTTP only

libi2pd/HTTP.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2023, The PurpleI2P Project
+* Copyright (c) 2013-2024, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -40,12 +40,13 @@ namespace http
 	inline bool is_http_method(const std::string & str) {
 		return std::find(HTTP_METHODS.begin(), HTTP_METHODS.end(), str) != std::end(HTTP_METHODS);
 	}
-
-	void strsplit(const std::string & line, std::vector<std::string> &tokens, char delim, std::size_t limit = 0) {
+	
+	static void strsplit(std::stringstream& ss, std::vector<std::string> &tokens, char delim, std::size_t limit = 0) 	
+	{
 		std::size_t count = 0;
-		std::stringstream ss(line);
 		std::string token;
-		while (1) {
+		while (1) 
+		{
 			count++;
 			if (limit > 0 && count >= limit)
 				delim = '\n'; /* reset delimiter */
@@ -55,21 +56,33 @@ namespace http
 		}
 	}
 
-	static std::pair<std::string, std::string> parse_header_line(const std::string& line)
+	static void strsplit(const std::string & line, std::vector<std::string> &tokens, char delim, std::size_t limit = 0) 
+	{
+		std::stringstream ss{line};
+		strsplit (ss, tokens, delim, limit);
+	}
+
+	static void strsplit(std::string_view line, std::vector<std::string> &tokens, char delim, std::size_t limit = 0) 
+	{	
+		std::stringstream ss{std::string(line)};
+		strsplit (ss, tokens, delim, limit);
+	}
+	
+	static std::pair<std::string, std::string> parse_header_line(std::string_view line)
 	{
 		std::size_t pos = 0;
 		std::size_t len = 1; /*: */
 		std::size_t max = line.length();
 		if ((pos = line.find(':', pos)) == std::string::npos)
-			return std::make_pair("", ""); // no ':' found
+			return std::pair{"", ""}; // no ':' found
 		if (pos + 1 < max) // ':' at the end of header is valid
 		{
 			while ((pos + len) < max && isspace(line.at(pos + len)))
 				len++;
 			if (len == 1)
-				return std::make_pair("", ""); // no following space, but something else
+				return std::pair{"", ""}; // no following space, but something else
 		}
-		return std::make_pair(line.substr(0, pos), line.substr(pos + len));
+		return std::pair{std::string (line.substr(0, pos)), std::string (line.substr(pos + len))};
 	}
 
 	void gen_rfc7231_date(std::string & out) {
@@ -83,15 +96,18 @@ namespace http
 		out = buf;
 	}
 
-	bool URL::parse(const char *str, std::size_t len) {
-		std::string url(str, len ? len : strlen(str));
-		return parse(url);
+	bool URL::parse(const char *str, std::size_t len) 
+	{
+		return parse({str, len ? len : strlen(str)});
 	}
 
-	bool URL::parse(const std::string& url) {
+	bool URL::parse(std::string_view url) 
+	{
+		if (url.empty ()) return false;
 		std::size_t pos_p = 0; /* < current parse position */
 		std::size_t pos_c = 0; /* < work position */
-		if(url.at(0) != '/' || pos_p > 0) {
+		if(url.at(0) != '/' || pos_p > 0) 
+		{
 			std::size_t pos_s = 0;
 
 			/* schema */
@@ -141,7 +157,7 @@ namespace http
 				/* port[/path] */
 				pos_p = pos_c + 1;
 				pos_c = url.find('/', pos_p);
-				std::string port_str = (pos_c == std::string::npos)
+				std::string_view port_str = (pos_c == std::string::npos)
 					? url.substr(pos_p, std::string::npos)
 					: url.substr(pos_p, pos_c - pos_p);
 				/* stoi throws exception on failure, we don't need it */
@@ -253,7 +269,7 @@ namespace http
 		return host.rfind(".i2p") == ( host.size() - 4 );
 	}
 
-	void HTTPMsg::add_header(const char *name, std::string & value, bool replace) {
+	void HTTPMsg::add_header(const char *name, const std::string & value, bool replace) {
 		add_header(name, value.c_str(), replace);
 	}
 
@@ -272,12 +288,13 @@ namespace http
 		headers.erase(name);
 	}
 
-	int HTTPReq::parse(const char *buf, size_t len) {
-		std::string str(buf, len);
-		return parse(str);
+	int HTTPReq::parse(const char *buf, size_t len) 
+	{
+		return parse({buf, len});
 	}
 
-	int HTTPReq::parse(const std::string& str) {
+	int HTTPReq::parse(std::string_view str) 
+	{
 		enum { REQ_LINE, HEADER_LINE } expect = REQ_LINE;
 		std::size_t eoh = str.find(HTTP_EOH); /* request head size */
 		std::size_t eol = 0, pos = 0;
@@ -286,9 +303,11 @@ namespace http
 		if (eoh == std::string::npos)
 			return 0; /* str not contains complete request */
 
-		while ((eol = str.find(CRLF, pos)) != std::string::npos) {
-			if (expect == REQ_LINE) {
-				std::string line = str.substr(pos, eol - pos);
+		while ((eol = str.find(CRLF, pos)) != std::string::npos) 
+		{
+			if (expect == REQ_LINE) 
+			{
+				std::string_view line = str.substr(pos, eol - pos);
 				std::vector<std::string> tokens;
 				strsplit(line, tokens, ' ');
 				if (tokens.size() != 3)
@@ -307,7 +326,7 @@ namespace http
 			}
 			else
 			{
-				std::string line = str.substr(pos, eol - pos);
+				std::string_view line = str.substr(pos, eol - pos);
 				auto p = parse_header_line(line);
 				if (p.first.length () > 0)
 					headers.push_back (p);
@@ -413,12 +432,13 @@ namespace http
 		return length;
 	}
 
-	int HTTPRes::parse(const char *buf, size_t len) {
-		std::string str(buf, len);
-		return parse(str);
+	int HTTPRes::parse(const char *buf, size_t len) 
+	{
+		return parse({buf,len});
 	}
 
-	int HTTPRes::parse(const std::string& str) {
+	int HTTPRes::parse(std::string_view str) 
+	{
 		enum { RES_LINE, HEADER_LINE } expect = RES_LINE;
 		std::size_t eoh = str.find(HTTP_EOH); /* request head size */
 		std::size_t eol = 0, pos = 0;
@@ -426,9 +446,11 @@ namespace http
 		if (eoh == std::string::npos)
 			return 0; /* str not contains complete request */
 
-		while ((eol = str.find(CRLF, pos)) != std::string::npos) {
-			if (expect == RES_LINE) {
-				std::string line = str.substr(pos, eol - pos);
+		while ((eol = str.find(CRLF, pos)) != std::string::npos) 
+		{
+			if (expect == RES_LINE) 
+			{
+				std::string_view line = str.substr(pos, eol - pos);
 				std::vector<std::string> tokens;
 				strsplit(line, tokens, ' ', 3);
 				if (tokens.size() != 3)
@@ -442,8 +464,10 @@ namespace http
 				version = tokens[0];
 				status  = tokens[2];
 				expect  = HEADER_LINE;
-			} else {
-				std::string line = str.substr(pos, eol - pos);
+			} 
+			else 
+			{
+				std::string_view line = str.substr(pos, eol - pos);
 				auto p = parse_header_line(line);
 				if (p.first.length () > 0)
 					headers.insert (p);
@@ -508,14 +532,14 @@ namespace http
 		return ptr;
 	}
 
-	std::string UrlDecode(const std::string& data, bool allow_null)
+	std::string UrlDecode(std::string_view data, bool allow_null)
 	{
 		std::string decoded(data);
 		size_t pos = 0;
 		while ((pos = decoded.find('%', pos)) != std::string::npos)
 		{
-			char c = strtol(decoded.substr(pos + 1, 2).c_str(), NULL, 16);
-			if (c == '\0' && !allow_null)
+			char c = std::stol(decoded.substr(pos + 1, 2), nullptr, 16);
+			if (!c && !allow_null)
 			{
 				pos += 3;
 				continue;

libi2pd/HTTP.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2023, The PurpleI2P Project
+* Copyright (c) 2013-2024, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -14,6 +14,7 @@
 #include <list>
 #include <sstream>
 #include <string>
+#include <string_view>
 #include <vector>
 
 namespace i2p
@@ -45,7 +46,7 @@ namespace http
 		 * @return true on success, false on invalid url
 		 */
 		bool parse (const char *str, std::size_t len = 0);
-		bool parse (const std::string& url);
+		bool parse (std::string_view url);
 
 		/**
 		 * @brief Parse query part of url to key/value map
@@ -69,7 +70,7 @@ namespace http
 	{
 		std::map<std::string, std::string> headers;
 
-		void add_header(const char *name, std::string & value, bool replace = false);
+		void add_header(const char *name, const std::string & value, bool replace = false);
 		void add_header(const char *name, const char *value, bool replace = false);
 		void del_header(const char *name);
 
@@ -92,7 +93,7 @@ namespace http
 		 * @note Positive return value is a size of header
 		 */
 		int parse(const char *buf, size_t len);
-		int parse(const std::string& buf);
+		int parse(std::string_view buf);
 
 		/** @brief Serialize HTTP request to string */
 		std::string to_string();
@@ -128,7 +129,7 @@ namespace http
 		 * @note Positive return value is a size of header
 		 */
 		int parse(const char *buf, size_t len);
-		int parse(const std::string& buf);
+		int parse(const std::string_view buf);
 
 		/**
 		 * @brief Serialize HTTP response to string
@@ -161,7 +162,7 @@ namespace http
 	 * @param null If set to true - decode also %00 sequence, otherwise - skip
 	 * @return Decoded string
 	 */
-	std::string UrlDecode(const std::string& data, bool null = false);
+	std::string UrlDecode(std::string_view data, bool null = false);
 
 	/**
 	 * @brief Merge HTTP response content with Transfer-Encoding: chunked

libi2pd/I2NPProtocol.cpp

@@ -10,20 +10,15 @@
 #include <atomic>
 #include "Base.h"
 #include "Log.h"
-#include "Crypto.h"
 #include "I2PEndian.h"
 #include "Timestamp.h"
 #include "RouterContext.h"
 #include "NetDb.hpp"
 #include "Tunnel.h"
-#include "Transports.h"
-#include "Garlic.h"
-#include "ECIESX25519AEADRatchetSession.h"
+#include "TransitTunnel.h"
 #include "I2NPProtocol.h"
 #include "version.h"
 
-using namespace i2p::transport;
-
 namespace i2p
 {
 	std::shared_ptr<I2NPMessage> NewI2NPMessage ()
@@ -147,7 +142,7 @@ namespace i2p
 	}
 
 	std::shared_ptr<I2NPMessage> CreateRouterInfoDatabaseLookupMsg (const uint8_t * key, const uint8_t * from,
-		uint32_t replyTunnelID, bool exploratory, std::set<i2p::data::IdentHash> * excludedPeers)
+		uint32_t replyTunnelID, bool exploratory, std::unordered_set<i2p::data::IdentHash> * excludedPeers)
 	{
 		int cnt = excludedPeers ? excludedPeers->size () : 0;
 		auto m = cnt > 7 ? NewI2NPMessage () : NewI2NPShortMessage ();
@@ -192,7 +187,7 @@ namespace i2p
 	}
 
 	std::shared_ptr<I2NPMessage> CreateLeaseSetDatabaseLookupMsg (const i2p::data::IdentHash& dest,
-		const std::set<i2p::data::IdentHash>& excludedFloodfills,
+		const std::unordered_set<i2p::data::IdentHash>& excludedFloodfills,
 		std::shared_ptr<const i2p::tunnel::InboundTunnel> replyTunnel, const uint8_t * replyKey,
 			const uint8_t * replyTag, bool replyECIES)
 	{
@@ -376,337 +371,6 @@ namespace i2p
 		return !msg->GetPayload ()[DATABASE_STORE_TYPE_OFFSET]; // 0- RouterInfo
 	}
 
-	static bool HandleBuildRequestRecords (int num, uint8_t * records, uint8_t * clearText)
-	{
-		for (int i = 0; i < num; i++)
-		{
-			uint8_t * record = records + i*TUNNEL_BUILD_RECORD_SIZE;
-			if (!memcmp (record + BUILD_REQUEST_RECORD_TO_PEER_OFFSET, (const uint8_t *)i2p::context.GetRouterInfo ().GetIdentHash (), 16))
-			{
-				LogPrint (eLogDebug, "I2NP: Build request record ", i, " is ours");
-				if (!i2p::context.DecryptTunnelBuildRecord (record + BUILD_REQUEST_RECORD_ENCRYPTED_OFFSET, clearText)) 
-				{
-					LogPrint (eLogWarning, "I2NP: Failed to decrypt tunnel build record");
-					return false;
-				}	
-				if (!memcmp ((const uint8_t *)i2p::context.GetIdentHash (), clearText + ECIES_BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET, 32) && // if next ident is now ours
-				    !(clearText[ECIES_BUILD_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_ENDPOINT_FLAG)) // and not endpoint
-				{
-					LogPrint (eLogWarning, "I2NP: Next ident is ours in tunnel build record");
-					return false;
-				}	
-				uint8_t retCode = 0;
-				// replace record to reply
-				if (i2p::context.AcceptsTunnels () && i2p::context.GetCongestionLevel (false) < CONGESTION_LEVEL_FULL)
-				{
-					auto transitTunnel = i2p::tunnel::CreateTransitTunnel (
-							bufbe32toh (clearText + ECIES_BUILD_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET),
-							clearText + ECIES_BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET,
-							bufbe32toh (clearText + ECIES_BUILD_REQUEST_RECORD_NEXT_TUNNEL_OFFSET),
-							clearText + ECIES_BUILD_REQUEST_RECORD_LAYER_KEY_OFFSET,
-							clearText + ECIES_BUILD_REQUEST_RECORD_IV_KEY_OFFSET,
-							clearText[ECIES_BUILD_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_GATEWAY_FLAG,
-							clearText[ECIES_BUILD_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_ENDPOINT_FLAG);
-					if (!i2p::tunnel::tunnels.AddTransitTunnel (transitTunnel))
-						retCode = 30;
-				}
-				else
-					retCode = 30; // always reject with bandwidth reason (30)
-
-				memset (record + ECIES_BUILD_RESPONSE_RECORD_OPTIONS_OFFSET, 0, 2); // no options
-				record[ECIES_BUILD_RESPONSE_RECORD_RET_OFFSET] = retCode;
-				// encrypt reply
-				i2p::crypto::CBCEncryption encryption;
-				for (int j = 0; j < num; j++)
-				{
-					uint8_t * reply = records + j*TUNNEL_BUILD_RECORD_SIZE;
-					if (j == i)
-					{
-						uint8_t nonce[12];
-						memset (nonce, 0, 12);
-						auto& noiseState = i2p::context.GetCurrentNoiseState ();
-						if (!i2p::crypto::AEADChaCha20Poly1305 (reply, TUNNEL_BUILD_RECORD_SIZE - 16,
-							noiseState.m_H, 32, noiseState.m_CK, nonce, reply, TUNNEL_BUILD_RECORD_SIZE, true)) // encrypt
-						{
-							LogPrint (eLogWarning, "I2NP: Reply AEAD encryption failed");
-							return false;
-						}
-					}
-					else
-					{
-						encryption.SetKey (clearText + ECIES_BUILD_REQUEST_RECORD_REPLY_KEY_OFFSET);
-						encryption.SetIV (clearText + ECIES_BUILD_REQUEST_RECORD_REPLY_IV_OFFSET);
-						encryption.Encrypt(reply, TUNNEL_BUILD_RECORD_SIZE, reply);
-					}
-				}
-				return true;
-			}
-		}
-		return false;
-	}
-
-	static void HandleVariableTunnelBuildMsg (uint32_t replyMsgID, uint8_t * buf, size_t len)
-	{
-		int num = buf[0];
-		LogPrint (eLogDebug, "I2NP: VariableTunnelBuild ", num, " records");
-		if (num > i2p::tunnel::MAX_NUM_RECORDS)
-		{
-			LogPrint (eLogError, "I2NP: Too many records in VaribleTunnelBuild message ", num);
-			return;
-		}
-		if (len < num*TUNNEL_BUILD_RECORD_SIZE + 1)
-		{
-			LogPrint (eLogError, "I2NP: VaribleTunnelBuild message of ", num, " records is too short ", len);
-			return;
-		}
-
-		auto tunnel = i2p::tunnel::tunnels.GetPendingInboundTunnel (replyMsgID);
-		if (tunnel)
-		{
-			// endpoint of inbound tunnel
-			LogPrint (eLogDebug, "I2NP: VariableTunnelBuild reply for tunnel ", tunnel->GetTunnelID ());
-			if (tunnel->HandleTunnelBuildResponse (buf, len))
-			{
-				LogPrint (eLogInfo, "I2NP: Inbound tunnel ", tunnel->GetTunnelID (), " has been created");
-				tunnel->SetState (i2p::tunnel::eTunnelStateEstablished);
-				i2p::tunnel::tunnels.AddInboundTunnel (tunnel);
-			}
-			else
-			{
-				LogPrint (eLogInfo, "I2NP: Inbound tunnel ", tunnel->GetTunnelID (), " has been declined");
-				tunnel->SetState (i2p::tunnel::eTunnelStateBuildFailed);
-			}
-		}
-		else
-		{
-			uint8_t clearText[ECIES_BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE];
-			if (HandleBuildRequestRecords (num, buf + 1, clearText))
-			{
-				if (clearText[ECIES_BUILD_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_ENDPOINT_FLAG) // we are endpoint of outboud tunnel
-				{
-					// so we send it to reply tunnel
-					transports.SendMessage (clearText + ECIES_BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET,
-						CreateTunnelGatewayMsg (bufbe32toh (clearText + ECIES_BUILD_REQUEST_RECORD_NEXT_TUNNEL_OFFSET),
-							eI2NPVariableTunnelBuildReply, buf, len,
-							bufbe32toh (clearText + ECIES_BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET)));
-				}
-				else
-					transports.SendMessage (clearText + ECIES_BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET,
-						CreateI2NPMessage (eI2NPVariableTunnelBuild, buf, len,
-							bufbe32toh (clearText + ECIES_BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET)));
-			}
-		}
-	}
-
-	static void HandleTunnelBuildMsg (uint8_t * buf, size_t len)
-	{
-		LogPrint (eLogWarning, "I2NP: TunnelBuild is too old for ECIES router");
-	}
-
-	static void HandleTunnelBuildReplyMsg (uint32_t replyMsgID, uint8_t * buf, size_t len, bool isShort)
-	{
-		int num = buf[0];
-		LogPrint (eLogDebug, "I2NP: TunnelBuildReplyMsg of ", num, " records replyMsgID=", replyMsgID);
-		if (num > i2p::tunnel::MAX_NUM_RECORDS)
-		{
-			LogPrint (eLogError, "I2NP: Too many records in TunnelBuildReply message ", num);
-			return;
-		}
-		size_t recordSize = isShort ? SHORT_TUNNEL_BUILD_RECORD_SIZE : TUNNEL_BUILD_RECORD_SIZE;
-		if (len < num*recordSize + 1)
-		{
-			LogPrint (eLogError, "I2NP: TunnelBuildReply message of ", num, " records is too short ", len);
-			return;
-		}
-
-		auto tunnel = i2p::tunnel::tunnels.GetPendingOutboundTunnel (replyMsgID);
-		if (tunnel)
-		{
-			// reply for outbound tunnel
-			if (tunnel->HandleTunnelBuildResponse (buf, len))
-			{
-				LogPrint (eLogInfo, "I2NP: Outbound tunnel ", tunnel->GetTunnelID (), " has been created");
-				tunnel->SetState (i2p::tunnel::eTunnelStateEstablished);
-				i2p::tunnel::tunnels.AddOutboundTunnel (tunnel);
-			}
-			else
-			{
-				LogPrint (eLogInfo, "I2NP: Outbound tunnel ", tunnel->GetTunnelID (), " has been declined");
-				tunnel->SetState (i2p::tunnel::eTunnelStateBuildFailed);
-			}
-		}
-		else
-			LogPrint (eLogWarning, "I2NP: Pending tunnel for message ", replyMsgID, " not found");
-	}
-
-	static void HandleShortTunnelBuildMsg (uint32_t replyMsgID, uint8_t * buf, size_t len)
-	{
-		int num = buf[0];
-		LogPrint (eLogDebug, "I2NP: ShortTunnelBuild ", num, " records");
-		if (num > i2p::tunnel::MAX_NUM_RECORDS)
-		{
-			LogPrint (eLogError, "I2NP: Too many records in ShortTunnelBuild message ", num);
-			return;
-		}
-		if (len < num*SHORT_TUNNEL_BUILD_RECORD_SIZE + 1)
-		{
-			LogPrint (eLogError, "I2NP: ShortTunnelBuild message of ", num, " records is too short ", len);
-			return;
-		}
-		auto tunnel = i2p::tunnel::tunnels.GetPendingInboundTunnel (replyMsgID);
-		if (tunnel)
-		{
-			// endpoint of inbound tunnel
-			LogPrint (eLogDebug, "I2NP: ShortTunnelBuild reply for tunnel ", tunnel->GetTunnelID ());
-			if (tunnel->HandleTunnelBuildResponse (buf, len))
-			{
-				LogPrint (eLogInfo, "I2NP: Inbound tunnel ", tunnel->GetTunnelID (), " has been created");
-				tunnel->SetState (i2p::tunnel::eTunnelStateEstablished);
-				i2p::tunnel::tunnels.AddInboundTunnel (tunnel);
-			}
-			else
-			{
-				LogPrint (eLogInfo, "I2NP: Inbound tunnel ", tunnel->GetTunnelID (), " has been declined");
-				tunnel->SetState (i2p::tunnel::eTunnelStateBuildFailed);
-			}
-			return;
-		}
-		const uint8_t * record = buf + 1;
-		for (int i = 0; i < num; i++)
-		{
-			if (!memcmp (record, (const uint8_t *)i2p::context.GetRouterInfo ().GetIdentHash (), 16))
-			{
-				LogPrint (eLogDebug, "I2NP: Short request record ", i, " is ours");
-				uint8_t clearText[SHORT_REQUEST_RECORD_CLEAR_TEXT_SIZE];
-				if (!i2p::context.DecryptTunnelShortRequestRecord (record + SHORT_REQUEST_RECORD_ENCRYPTED_OFFSET, clearText))
-				{
-					LogPrint (eLogWarning, "I2NP: Can't decrypt short request record ", i);
-					return;
-				}
-				if (clearText[SHORT_REQUEST_RECORD_LAYER_ENCRYPTION_TYPE]) // not AES
-				{
-					LogPrint (eLogWarning, "I2NP: Unknown layer encryption type ", clearText[SHORT_REQUEST_RECORD_LAYER_ENCRYPTION_TYPE], " in short request record");
-					return;
-				}
-				auto& noiseState = i2p::context.GetCurrentNoiseState ();
-				uint8_t replyKey[32]; // AEAD/Chacha20/Poly1305
-				i2p::crypto::AESKey layerKey, ivKey; // AES
-				i2p::crypto::HKDF (noiseState.m_CK, nullptr, 0, "SMTunnelReplyKey", noiseState.m_CK);
-				memcpy (replyKey, noiseState.m_CK + 32, 32);
-				i2p::crypto::HKDF (noiseState.m_CK, nullptr, 0, "SMTunnelLayerKey", noiseState.m_CK);
-				memcpy (layerKey, noiseState.m_CK + 32, 32);
-				bool isEndpoint = clearText[SHORT_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_ENDPOINT_FLAG;
-				if (isEndpoint)
-				{
-					i2p::crypto::HKDF (noiseState.m_CK, nullptr, 0, "TunnelLayerIVKey", noiseState.m_CK);
-					memcpy (ivKey, noiseState.m_CK + 32, 32);
-				}
-				else
-				{	
-					if (!memcmp ((const uint8_t *)i2p::context.GetIdentHash (), clearText + SHORT_REQUEST_RECORD_NEXT_IDENT_OFFSET, 32)) // if next ident is now ours
-					{
-						LogPrint (eLogWarning, "I2NP: Next ident is ours in short request record");
-						return;
-					}	
-					memcpy (ivKey, noiseState.m_CK , 32);
-				}	
-
-				// check if we accept this tunnel
-				std::shared_ptr<i2p::tunnel::TransitTunnel> transitTunnel;
-				uint8_t retCode = 0;
-				if (!i2p::context.AcceptsTunnels () || i2p::context.GetCongestionLevel (false) >= CONGESTION_LEVEL_FULL)
-					retCode = 30;
-				if (!retCode)
-				{
-					// create new transit tunnel
-					transitTunnel = i2p::tunnel::CreateTransitTunnel (
-						bufbe32toh (clearText + SHORT_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET),
-						clearText + SHORT_REQUEST_RECORD_NEXT_IDENT_OFFSET,
-						bufbe32toh (clearText + SHORT_REQUEST_RECORD_NEXT_TUNNEL_OFFSET),
-						layerKey, ivKey,
-						clearText[SHORT_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_GATEWAY_FLAG,
-						clearText[SHORT_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_ENDPOINT_FLAG);
-					if (!i2p::tunnel::tunnels.AddTransitTunnel (transitTunnel))
-						retCode = 30;
-				}
-
-				// encrypt reply
-				uint8_t nonce[12];
-				memset (nonce, 0, 12);
-				uint8_t * reply = buf + 1;
-				for (int j = 0; j < num; j++)
-				{
-					nonce[4] = j; // nonce is record #
-					if (j == i)
-					{
-						memset (reply + SHORT_RESPONSE_RECORD_OPTIONS_OFFSET, 0, 2); // no options
-						reply[SHORT_RESPONSE_RECORD_RET_OFFSET] = retCode;
-						if (!i2p::crypto::AEADChaCha20Poly1305 (reply, SHORT_TUNNEL_BUILD_RECORD_SIZE - 16,
-							noiseState.m_H, 32, replyKey, nonce, reply, SHORT_TUNNEL_BUILD_RECORD_SIZE, true)) // encrypt
-						{
-							LogPrint (eLogWarning, "I2NP: Short reply AEAD encryption failed");
-							return;
-						}
-					}
-					else
-						i2p::crypto::ChaCha20 (reply, SHORT_TUNNEL_BUILD_RECORD_SIZE, replyKey, nonce, reply);
-					reply += SHORT_TUNNEL_BUILD_RECORD_SIZE;
-				}
-				// send reply
-				auto onDrop = [transitTunnel]()
-					{
-						if (transitTunnel)
-						{
-							auto t = transitTunnel->GetCreationTime ();
-							if (t > i2p::tunnel::TUNNEL_EXPIRATION_TIMEOUT)
-								// make transit tunnel expired 
-								transitTunnel->SetCreationTime (t - i2p::tunnel::TUNNEL_EXPIRATION_TIMEOUT);
-						}	
-					};
-				if (isEndpoint)
-				{
-					auto replyMsg = NewI2NPShortMessage ();
-					replyMsg->Concat (buf, len);
-					replyMsg->FillI2NPMessageHeader (eI2NPShortTunnelBuildReply, bufbe32toh (clearText + SHORT_REQUEST_RECORD_SEND_MSG_ID_OFFSET));
-					if (transitTunnel) replyMsg->onDrop = onDrop;
-					if (memcmp ((const uint8_t *)i2p::context.GetIdentHash (),
-						clearText + SHORT_REQUEST_RECORD_NEXT_IDENT_OFFSET, 32)) // reply IBGW is not local?
-					{
-						i2p::crypto::HKDF (noiseState.m_CK, nullptr, 0, "RGarlicKeyAndTag", noiseState.m_CK);
-						uint64_t tag;
-						memcpy (&tag, noiseState.m_CK, 8);
-						// we send it to reply tunnel
-						transports.SendMessage (clearText + SHORT_REQUEST_RECORD_NEXT_IDENT_OFFSET,
-						CreateTunnelGatewayMsg (bufbe32toh (clearText + SHORT_REQUEST_RECORD_NEXT_TUNNEL_OFFSET),
-							i2p::garlic::WrapECIESX25519Message (replyMsg, noiseState.m_CK + 32, tag)));
-					}
-					else
-					{
-						// IBGW is local
-						uint32_t tunnelID = bufbe32toh (clearText + SHORT_REQUEST_RECORD_NEXT_TUNNEL_OFFSET);
-						auto tunnel = i2p::tunnel::tunnels.GetTunnel (tunnelID);
-						if (tunnel)
-						{	
-							tunnel->SendTunnelDataMsg (replyMsg);
-							tunnel->FlushTunnelDataMsgs ();
-						}	
-						else
-							LogPrint (eLogWarning, "I2NP: Tunnel ", tunnelID, " not found for short tunnel build reply");
-					}
-				}
-				else
-				{
-					auto msg = CreateI2NPMessage (eI2NPShortTunnelBuild, buf, len,
-							bufbe32toh (clearText + SHORT_REQUEST_RECORD_SEND_MSG_ID_OFFSET));
-					if (transitTunnel) msg->onDrop = onDrop;
-					transports.SendMessage (clearText + SHORT_REQUEST_RECORD_NEXT_IDENT_OFFSET, msg);
-				}	
-				return;
-			}
-			record += SHORT_TUNNEL_BUILD_RECORD_SIZE;
-		}
-	}
-
 	std::shared_ptr<I2NPMessage> CreateTunnelDataMsg (const uint8_t * buf)
 	{
 		auto msg = NewI2NPTunnelMessage (false);
@@ -802,41 +466,6 @@ namespace i2p
 		return l;
 	}
 
-	void HandleTunnelBuildI2NPMessage (std::shared_ptr<I2NPMessage> msg)
-	{
-		if (msg)
-		{
-			uint8_t typeID = msg->GetTypeID();
-			uint32_t msgID = msg->GetMsgID();
-			LogPrint (eLogDebug, "I2NP: Handling tunnel build message with len=", msg->GetLength(),", type=", (int)typeID, ", msgID=", (unsigned int)msgID);
-			uint8_t * payload = msg->GetPayload();
-			auto size = msg->GetPayloadLength();
-			switch (typeID)
-			{
-				case eI2NPVariableTunnelBuild:
-					HandleVariableTunnelBuildMsg (msgID, payload, size);
-					break;
-				case eI2NPShortTunnelBuild:
-					HandleShortTunnelBuildMsg (msgID, payload, size);
-					break;
-				case eI2NPVariableTunnelBuildReply:
-					HandleTunnelBuildReplyMsg (msgID, payload, size, false);
-					break;
-				case eI2NPShortTunnelBuildReply:
-					HandleTunnelBuildReplyMsg (msgID, payload, size, true);
-					break;
-				case eI2NPTunnelBuild:
-					HandleTunnelBuildMsg (payload, size);
-					break;
-				case eI2NPTunnelBuildReply:
-					// TODO:
-					break;
-				default:
-					LogPrint (eLogError, "I2NP: Unexpected message with type", (int)typeID, " during handling TBM; skipping");
-			}
-		}
-	}
-
 	void HandleI2NPMessage (std::shared_ptr<I2NPMessage> msg)
 	{
 		if (msg)
@@ -862,12 +491,14 @@ namespace i2p
 					break;
 				}
 				case eI2NPDatabaseStore:
-				case eI2NPDatabaseSearchReply:	
 					// forward to netDb if came directly or through exploratory tunnel as response to our request
 					if (!msg->from || !msg->from->GetTunnelPool () || msg->from->GetTunnelPool ()->IsExploratory ())
 						i2p::data::netdb.PostI2NPMsg (msg);
 				break;
-				
+				case eI2NPDatabaseSearchReply:
+					if (!msg->from || !msg->from->GetTunnelPool () || msg->from->GetTunnelPool ()->IsExploratory ())
+						i2p::data::netdb.PostDatabaseSearchReplyMsg (msg);
+				break;	
 				case eI2NPDatabaseLookup:
 					// forward to netDb if floodfill and came directly
 					if (!msg->from && i2p::context.IsFloodfill ())
@@ -930,14 +561,8 @@ namespace i2p
 	void I2NPMessagesHandler::Flush ()
 	{
 		if (!m_TunnelMsgs.empty ())
-		{
 			i2p::tunnel::tunnels.PostTunnelData (m_TunnelMsgs);
-			m_TunnelMsgs.clear ();
-		}
 		if (!m_TunnelGatewayMsgs.empty ())
-		{
 			i2p::tunnel::tunnels.PostTunnelData (m_TunnelGatewayMsgs);
-			m_TunnelGatewayMsgs.clear ();
-		}
 	}
 }

libi2pd/I2NPProtocol.h

@@ -11,8 +11,9 @@
 
 #include <inttypes.h>
 #include <string.h>
-#include <set>
+#include <unordered_set>
 #include <memory>
+#include <list>
 #include <functional>
 #include "Crypto.h"
 #include "I2PEndian.h"
@@ -107,7 +108,6 @@ namespace i2p
 
 	enum I2NPMessageType
 	{
-		eI2NPDummyMsg = 0,
 		eI2NPDatabaseStore = 1,
 		eI2NPDatabaseLookup = 2,
 		eI2NPDatabaseSearchReply = 3,
@@ -294,9 +294,9 @@ namespace tunnel
 	std::shared_ptr<I2NPMessage> CreateTunnelTestMsg (uint32_t msgID);
 	std::shared_ptr<I2NPMessage> CreateDeliveryStatusMsg (uint32_t msgID);
 	std::shared_ptr<I2NPMessage> CreateRouterInfoDatabaseLookupMsg (const uint8_t * key, const uint8_t * from,
-		uint32_t replyTunnelID, bool exploratory = false, std::set<i2p::data::IdentHash> * excludedPeers = nullptr);
+		uint32_t replyTunnelID, bool exploratory = false, std::unordered_set<i2p::data::IdentHash> * excludedPeers = nullptr);
 	std::shared_ptr<I2NPMessage> CreateLeaseSetDatabaseLookupMsg (const i2p::data::IdentHash& dest,
-		const std::set<i2p::data::IdentHash>& excludedFloodfills,
+		const std::unordered_set<i2p::data::IdentHash>& excludedFloodfills,
 		std::shared_ptr<const i2p::tunnel::InboundTunnel> replyTunnel,
 		const uint8_t * replyKey, const uint8_t * replyTag, bool replyECIES = false);
 	std::shared_ptr<I2NPMessage> CreateDatabaseSearchReply (const i2p::data::IdentHash& ident, std::vector<i2p::data::IdentHash> routers);
@@ -316,7 +316,6 @@ namespace tunnel
 	std::shared_ptr<I2NPMessage> CreateTunnelGatewayMsg (uint32_t tunnelID, std::shared_ptr<I2NPMessage> msg);
 
 	size_t GetI2NPMessageLength (const uint8_t * msg, size_t len);
-	void HandleTunnelBuildI2NPMessage (std::shared_ptr<I2NPMessage> msg);
 	void HandleI2NPMessage (std::shared_ptr<I2NPMessage> msg);
 
 	class I2NPMessagesHandler
@@ -329,7 +328,7 @@ namespace tunnel
 
 		private:
 
-			std::vector<std::shared_ptr<I2NPMessage> > m_TunnelMsgs, m_TunnelGatewayMsgs;
+			std::list<std::shared_ptr<I2NPMessage> > m_TunnelMsgs, m_TunnelGatewayMsgs;
 	};
 }
 

libi2pd/Identity.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2023, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -27,18 +27,15 @@ namespace data
 
 	size_t Identity::FromBuffer (const uint8_t * buf, size_t len)
 	{
-		if ( len < DEFAULT_IDENTITY_SIZE ) {
-			// buffer too small, don't overflow
-			return 0;
-		}
-		memcpy (publicKey, buf, DEFAULT_IDENTITY_SIZE);
+		if (len < DEFAULT_IDENTITY_SIZE) return 0; // buffer too small, don't overflow
+		memcpy (this, buf, DEFAULT_IDENTITY_SIZE);
 		return DEFAULT_IDENTITY_SIZE;
 	}
 
 	IdentHash Identity::Hash () const
 	{
 		IdentHash hash;
-		SHA256(publicKey, DEFAULT_IDENTITY_SIZE, hash);
+		SHA256((const uint8_t *)this, DEFAULT_IDENTITY_SIZE, hash);
 		return hash;
 	}
 
@@ -262,11 +259,11 @@ namespace data
 		return fullLen;
 	}
 
-	size_t IdentityEx::FromBase64(const std::string& s)
+	size_t IdentityEx::FromBase64(std::string_view s)
 	{
 		const size_t slen = s.length();
 		std::vector<uint8_t> buf(slen); // binary data can't exceed base64
-		const size_t len = Base64ToByteStream (s.c_str(), slen, buf.data(), slen);
+		const size_t len = Base64ToByteStream (s.data(), slen, buf.data(), slen);
 		return FromBuffer (buf.data(), len);
 	}
 
@@ -420,6 +417,14 @@ namespace data
 		return CreateEncryptor (GetCryptoKeyType (), key);
 	}
 
+	size_t GetIdentityBufferLen (const uint8_t * buf, size_t len)
+	{
+		if (len < DEFAULT_IDENTITY_SIZE) return 0;
+		size_t l = DEFAULT_IDENTITY_SIZE + bufbe16toh (buf + DEFAULT_IDENTITY_SIZE - 2);
+		if (l > len) return 0;
+		return l;
+	}	
+		
 	PrivateKeys& PrivateKeys::operator=(const Keys& keys)
 	{
 		m_Public = std::make_shared<IdentityEx>(Identity (keys));
@@ -479,7 +484,12 @@ namespace data
 		{
 			// offline information
 			const uint8_t * offlineInfo = buf + ret;
-			ret += 4; // expires timestamp
+			uint32_t expires = bufbe32toh (buf + ret); ret += 4; // expires timestamp
+			if (expires < i2p::util::GetSecondsSinceEpoch ())
+			{
+				LogPrint (eLogError, "Identity: Offline signature expired");
+				return 0;
+			}	
 			SigningKeyType keyType = bufbe16toh (buf + ret); ret += 2; // key type
 			std::unique_ptr<i2p::crypto::Verifier> transientVerifier (IdentityEx::CreateVerifier (keyType));
 			if (!transientVerifier) return 0;
@@ -715,9 +725,7 @@ namespace data
 			case SIGNING_KEY_TYPE_RSA_SHA384_3072:
 			case SIGNING_KEY_TYPE_RSA_SHA512_4096:
 				LogPrint (eLogWarning, "Identity: RSA signature type is not supported. Creating EdDSA");
-#if (__cplusplus >= 201703L) // C++ 17 or higher
 				[[fallthrough]];
-#endif
 				// no break here
 			case SIGNING_KEY_TYPE_EDDSA_SHA512_ED25519:
 				i2p::crypto::CreateEDDSA25519RandomKeys (priv, pub);
@@ -790,11 +798,14 @@ namespace data
 		return keys;
 	}
 
-	IdentHash CreateRoutingKey (const IdentHash& ident)
+	IdentHash CreateRoutingKey (const IdentHash& ident, bool nextDay)
 	{
 		uint8_t buf[41]; // ident + yyyymmdd
 		memcpy (buf, (const uint8_t *)ident, 32);
-		i2p::util::GetCurrentDate ((char *)(buf + 32));
+		if (nextDay)
+			i2p::util::GetNextDayDate ((char *)(buf + 32));
+		else	
+			i2p::util::GetCurrentDate ((char *)(buf + 32));
 		IdentHash key;
 		SHA256(buf, 40, key);
 		return key;

libi2pd/Identity.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2023, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -12,6 +12,7 @@
 #include <inttypes.h>
 #include <string.h>
 #include <string>
+#include <string_view>
 #include <memory>
 #include <vector>
 #include "Base.h"
@@ -99,7 +100,7 @@ namespace data
 
 			size_t FromBuffer (const uint8_t * buf, size_t len);
 			size_t ToBuffer (uint8_t * buf, size_t len) const;
-			size_t FromBase64(const std::string& s);
+			size_t FromBase64(std::string_view s);
 			std::string ToBase64 () const;
 			const Identity& GetStandardIdentity () const { return m_StandardIdentity; };
 
@@ -136,6 +137,8 @@ namespace data
 			uint8_t m_ExtendedBuffer[MAX_EXTENDED_BUFFER_SIZE];
 	};
 
+	size_t GetIdentityBufferLen (const uint8_t * buf, size_t len); // return actual identity length in buffer
+
 	class PrivateKeys // for eepsites
 	{
 		public:
@@ -206,7 +209,7 @@ namespace data
 		bool operator< (const XORMetric& other) const { return memcmp (metric, other.metric, 32) < 0; };
 	};
 
-	IdentHash CreateRoutingKey (const IdentHash& ident);
+	IdentHash CreateRoutingKey (const IdentHash& ident, bool nextDay = false);
 	XORMetric operator^(const IdentHash& key1, const IdentHash& key2);
 
 	// destination for delivery instructions

libi2pd/LeaseSet.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2023, The PurpleI2P Project
+* Copyright (c) 2013-2024, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -425,6 +425,16 @@ namespace data
 		if (offset + 1 > len) return 0;
 		int numLeases = buf[offset]; offset++;
 		auto ts = i2p::util::GetMillisecondsSinceEpoch ();
+		if (GetExpirationTime () > ts + LEASESET_EXPIRATION_TIME_THRESHOLD)
+		{
+			LogPrint (eLogWarning, "LeaseSet2: Expiration time is from future ", GetExpirationTime ()/1000LL);
+			return 0;
+		}	
+		if (ts > m_PublishedTimestamp*1000LL + LEASESET_EXPIRATION_TIME_THRESHOLD)
+		{
+			LogPrint (eLogWarning, "LeaseSet2: Published time is too old ", m_PublishedTimestamp);
+			return 0;
+		}	
 		if (IsStoreLeases ())
 		{
 			UpdateLeasesBegin ();
@@ -435,6 +445,11 @@ namespace data
 				lease.tunnelGateway = buf + offset; offset += 32; // gateway
 				lease.tunnelID = bufbe32toh (buf + offset); offset += 4; // tunnel ID
 				lease.endDate = bufbe32toh (buf + offset)*1000LL; offset += 4; // end date
+				if (lease.endDate > ts + LEASESET_EXPIRATION_TIME_THRESHOLD)
+				{
+					LogPrint (eLogWarning, "LeaseSet2: Lease end date is from future ", lease.endDate);
+					return 0;
+				}	
 				UpdateLease (lease, ts);
 			}
 			UpdateLeasesEnd ();
@@ -728,25 +743,41 @@ namespace data
 		memset (m_Buffer + offset, 0, signingKeyLen);
 		offset += signingKeyLen;
 		// num leases
+		auto numLeasesPos = offset;	
 		m_Buffer[offset] = num;
 		offset++;
 		// leases
 		m_Leases = m_Buffer + offset;
 		auto currentTime = i2p::util::GetMillisecondsSinceEpoch ();
+		int skipped = 0;
 		for (int i = 0; i < num; i++)
 		{
+			uint64_t ts = tunnels[i]->GetCreationTime () + i2p::tunnel::TUNNEL_EXPIRATION_TIMEOUT - i2p::tunnel::TUNNEL_EXPIRATION_THRESHOLD; // 1 minute before expiration
+			ts *= 1000; // in milliseconds
+			if (ts <= currentTime)
+			{
+				// already expired, skip
+				skipped++;
+				continue;
+			}	
+			if (ts > m_ExpirationTime) m_ExpirationTime = ts;
+			// make sure leaseset is newer than previous, but adding some time to expiration date
+			ts += (currentTime - tunnels[i]->GetCreationTime ()*1000LL)*2/i2p::tunnel::TUNNEL_EXPIRATION_TIMEOUT; // up to 2 secs
 			memcpy (m_Buffer + offset, tunnels[i]->GetNextIdentHash (), 32);
 			offset += 32; // gateway id
 			htobe32buf (m_Buffer + offset, tunnels[i]->GetNextTunnelID ());
 			offset += 4; // tunnel id
-			uint64_t ts = tunnels[i]->GetCreationTime () + i2p::tunnel::TUNNEL_EXPIRATION_TIMEOUT - i2p::tunnel::TUNNEL_EXPIRATION_THRESHOLD; // 1 minute before expiration
-			ts *= 1000; // in milliseconds
-			if (ts > m_ExpirationTime) m_ExpirationTime = ts;
-			// make sure leaseset is newer than previous, but adding some time to expiration date
-			ts += (currentTime - tunnels[i]->GetCreationTime ()*1000LL)*2/i2p::tunnel::TUNNEL_EXPIRATION_TIMEOUT; // up to 2 secs
 			htobe64buf (m_Buffer + offset, ts);
 			offset += 8; // end date
 		}
+		if (skipped > 0)
+		{
+			// adjust num leases
+			if (skipped > num) skipped = num;
+			num -= skipped;
+			m_BufferLen -= skipped*LEASE_SIZE;
+			m_Buffer[numLeasesPos] = num;
+		}	
 		// we don't sign it yet. must be signed later on
 	}
 
@@ -808,7 +839,7 @@ namespace data
 
 	LocalLeaseSet2::LocalLeaseSet2 (uint8_t storeType, const i2p::data::PrivateKeys& keys,
 		const KeySections& encryptionKeys, const std::vector<std::shared_ptr<i2p::tunnel::InboundTunnel> >& tunnels,
-		bool isPublic, bool isPublishedEncrypted):
+		bool isPublic, uint64_t publishedTimestamp, bool isPublishedEncrypted):
 		LocalLeaseSet (keys.GetPublic (), nullptr, 0)
 	{
 		auto identity = keys.GetPublic ();
@@ -837,8 +868,7 @@ namespace data
 		m_Buffer[0] = storeType;
 		// LS2 header
 		auto offset = identity->ToBuffer (m_Buffer + 1, m_BufferLen) + 1;
-		auto timestamp = i2p::util::GetSecondsSinceEpoch ();
-		htobe32buf (m_Buffer + offset, timestamp); offset += 4; // published timestamp (seconds)
+		htobe32buf (m_Buffer + offset, publishedTimestamp); offset += 4; // published timestamp (seconds)
 		uint8_t * expiresBuf = m_Buffer + offset; offset += 2; // expires, fill later
 		htobe16buf (m_Buffer + offset, flags); offset += 2; // flags
 		if (keys.IsOfflineSignature ())
@@ -859,29 +889,44 @@ namespace data
 		}
 		// leases
 		uint32_t expirationTime = 0; // in seconds
+		int skipped = 0; auto numLeasesPos = offset;
 		m_Buffer[offset] = num; offset++; // num leases
 		for (int i = 0; i < num; i++)
 		{
+			auto ts = tunnels[i]->GetCreationTime () + i2p::tunnel::TUNNEL_EXPIRATION_TIMEOUT - i2p::tunnel::TUNNEL_EXPIRATION_THRESHOLD; // in seconds, 1 minute before expiration
+			if (ts <= publishedTimestamp) 
+			{	
+				// already expired, skip
+				skipped++;
+				continue; 
+			}	
+			if (ts > expirationTime) expirationTime = ts;
 			memcpy (m_Buffer + offset, tunnels[i]->GetNextIdentHash (), 32);
 			offset += 32; // gateway id
 			htobe32buf (m_Buffer + offset, tunnels[i]->GetNextTunnelID ());
 			offset += 4; // tunnel id
-			auto ts = tunnels[i]->GetCreationTime () + i2p::tunnel::TUNNEL_EXPIRATION_TIMEOUT - i2p::tunnel::TUNNEL_EXPIRATION_THRESHOLD; // in seconds, 1 minute before expiration
-			if (ts > expirationTime) expirationTime = ts;
 			htobe32buf (m_Buffer + offset, ts);
 			offset += 4; // end date
 		}
+		if (skipped > 0)
+		{
+			// adjust num leases
+			if (skipped > num) skipped = num;
+			num -= skipped;
+			m_BufferLen -= skipped*LEASE2_SIZE;
+			m_Buffer[numLeasesPos] = num;
+		}	
 		// update expiration
 		if (expirationTime)
 		{
 			SetExpirationTime (expirationTime*1000LL);
-			auto expires = (int)expirationTime - timestamp;
+			auto expires = (int)expirationTime - publishedTimestamp;
 			htobe16buf (expiresBuf, expires > 0 ? expires : 0);
 		}
 		else
 		{
 			// no tunnels or withdraw
-			SetExpirationTime (timestamp*1000LL);
+			SetExpirationTime (publishedTimestamp*1000LL);
 			memset (expiresBuf, 0, 2); // expires immeditely
 		}
 		// sign

libi2pd/LeaseSet.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2023, The PurpleI2P Project
+* Copyright (c) 2013-2024, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -62,7 +62,8 @@ namespace data
 	const size_t LEASE_SIZE = 44; // 32 + 4 + 8
 	const size_t LEASE2_SIZE = 40; // 32 + 4 + 4
 	const uint8_t MAX_NUM_LEASES = 16;
-
+	const uint64_t LEASESET_EXPIRATION_TIME_THRESHOLD = 12*60*1000; // in milliseconds
+	
 	const uint8_t NETDB_STORE_TYPE_LEASESET = 1;
 	class LeaseSet: public RoutingDestination
 	{
@@ -180,7 +181,7 @@ namespace data
 		private:
 
 			uint8_t m_StoreType;
-			uint32_t m_PublishedTimestamp = 0;
+			uint32_t m_PublishedTimestamp = 0; // seconds
 			bool m_IsPublic = true, m_IsPublishedEncrypted = false;
 			std::shared_ptr<i2p::crypto::Verifier> m_TransientVerifier;
 			CryptoKeyType m_EncryptionType;
@@ -256,7 +257,8 @@ namespace data
 			LocalLeaseSet2 (uint8_t storeType, const i2p::data::PrivateKeys& keys,
 				const KeySections& encryptionKeys,
 				const std::vector<std::shared_ptr<i2p::tunnel::InboundTunnel> >& tunnels,
-				bool isPublic, bool isPublishedEncrypted = false);
+				bool isPublic, uint64_t publishedTimestamp,
+			    bool isPublishedEncrypted = false);
 
 			LocalLeaseSet2 (uint8_t storeType, std::shared_ptr<const IdentityEx> identity, const uint8_t * buf, size_t len); // from I2CP
 

libi2pd/Log.h

@@ -172,16 +172,6 @@ void LogPrint (std::stringstream& s, TValue&& arg) noexcept
 	s << std::forward<TValue>(arg);
 }
 
-#if (__cplusplus < 201703L) // below C++ 17
-/** internal usage only -- folding args array to single string */
-template<typename TValue, typename... TArgs>
-void LogPrint (std::stringstream& s, TValue&& arg, TArgs&&... args) noexcept
-{
-	LogPrint (s, std::forward<TValue>(arg));
-	LogPrint (s, std::forward<TArgs>(args)...);
-}
-#endif
-
 /**
  * @brief Create log message and send it to queue
  * @param level Message level (eLogError, eLogInfo, ...)
@@ -194,13 +184,7 @@ void LogPrint (LogLevel level, TArgs&&... args) noexcept
 
 	// fold message to single string
 	std::stringstream ss;
-
-#if (__cplusplus >= 201703L) // C++ 17 or higher
 	(LogPrint (ss, std::forward<TArgs>(args)), ...);
-#else
-	LogPrint (ss, std::forward<TArgs>(args)...);
-#endif
-
 	auto msg = std::make_shared<i2p::log::LogMsg>(level, std::time(nullptr), std::move(ss).str());
 	msg->tid = std::this_thread::get_id();
 	i2p::log::Logger().Append(msg);
@@ -217,11 +201,7 @@ void ThrowFatal (TArgs&&... args) noexcept
 	if (!f) return;
 	// fold message to single string
 	std::stringstream ss("");
-#if (__cplusplus >= 201703L) // C++ 17 or higher
 	(LogPrint (ss, std::forward<TArgs>(args)), ...);
-#else
-	LogPrint (ss, std::forward<TArgs>(args)...);
-#endif
 	f (ss.str ());
 }
 

libi2pd/NTCP2.h

@@ -14,6 +14,7 @@
 #include <list>
 #include <map>
 #include <array>
+#include <random>
 #include <openssl/bn.h>
 #include <openssl/evp.h>
 #include <boost/asio.hpp>
@@ -35,8 +36,10 @@ namespace transport
 
 	const int NTCP2_CONNECT_TIMEOUT = 5; // 5 seconds
 	const int NTCP2_ESTABLISH_TIMEOUT = 10; // 10 seconds
-	const int NTCP2_TERMINATION_TIMEOUT = 120; // 2 minutes
-	const int NTCP2_TERMINATION_CHECK_TIMEOUT = 30; // 30 seconds
+	const int NTCP2_TERMINATION_TIMEOUT = 115; // 2 minutes - 5 seconds
+	const int NTCP2_TERMINATION_TIMEOUT_VARIANCE = 10; // 10 seconds
+	const int NTCP2_TERMINATION_CHECK_TIMEOUT = 28; // 28 seconds
+	const int NTCP2_TERMINATION_CHECK_TIMEOUT_VARIANCE = 5; // 5 seconds
 	const int NTCP2_RECEIVE_BUFFER_DELETION_TIMEOUT = 3; // 3 seconds
 	const int NTCP2_ROUTERINFO_RESEND_INTERVAL = 25*60; // 25 minuntes in seconds
 	const int NTCP2_ROUTERINFO_RESEND_INTERVAL_THRESHOLD = 25*60; // 25 minuntes
@@ -92,21 +95,21 @@ namespace transport
 		const uint8_t * GetCK () const { return m_CK; };
 		const uint8_t * GetH () const { return m_H; };
 
-		void KDF1Alice ();
-		void KDF1Bob ();
-		void KDF2Alice ();
-		void KDF2Bob ();
-		void KDF3Alice (); // for SessionConfirmed part 2
-		void KDF3Bob ();
+		bool KDF1Alice ();
+		bool KDF1Bob ();
+		bool KDF2Alice ();
+		bool KDF2Bob ();
+		bool KDF3Alice (); // for SessionConfirmed part 2
+		bool KDF3Bob ();
 
-		void KeyDerivationFunction1 (const uint8_t * pub, i2p::crypto::X25519Keys& priv, const uint8_t * rs, const uint8_t * epub); // for SessionRequest, (pub, priv) for DH
-		void KeyDerivationFunction2 (const uint8_t * sessionRequest, size_t sessionRequestLen, const uint8_t * epub); // for SessionCreate
+		bool KeyDerivationFunction1 (const uint8_t * pub, i2p::crypto::X25519Keys& priv, const uint8_t * rs, const uint8_t * epub); // for SessionRequest, (pub, priv) for DH
+		bool KeyDerivationFunction2 (const uint8_t * sessionRequest, size_t sessionRequestLen, const uint8_t * epub); // for SessionCreate
 		void CreateEphemeralKey ();
 
-		void CreateSessionRequestMessage ();
-		void CreateSessionCreatedMessage ();
+		bool CreateSessionRequestMessage (std::mt19937& rng);
+		bool CreateSessionCreatedMessage (std::mt19937& rng);
 		void CreateSessionConfirmedMessagePart1 (const uint8_t * nonce);
-		void CreateSessionConfirmedMessagePart2 (const uint8_t * nonce);
+		bool CreateSessionConfirmedMessagePart2 (const uint8_t * nonce);
 
 		bool ProcessSessionRequestMessage (uint16_t& paddingLen, bool& clockSkew);
 		bool ProcessSessionCreatedMessage (uint16_t& paddingLen);
@@ -144,14 +147,16 @@ namespace transport
 			void SetRemoteEndpoint (const boost::asio::ip::tcp::endpoint& ep) { m_RemoteEndpoint = ep; };
 
 			bool IsEstablished () const override { return m_IsEstablished; };
+			i2p::data::RouterInfo::SupportedTransports GetTransportType () const override;
 			bool IsTerminated () const { return m_IsTerminated; };
 
 			void ClientLogin (); // Alice
 			void ServerLogin (); // Bob
 
 			void SendLocalRouterInfo (bool update) override; // after handshake or by update
-			void SendI2NPMessages (const std::vector<std::shared_ptr<I2NPMessage> >& msgs) override;
-
+			void SendI2NPMessages (std::list<std::shared_ptr<I2NPMessage> >& msgs) override;
+			void MoveSendQueue (std::shared_ptr<NTCP2Session> other);
+			
 		private:
 
 			void Established ();
@@ -168,13 +173,17 @@ namespace transport
 
 			void HandleSessionRequestSent (const boost::system::error_code& ecode, std::size_t bytes_transferred);
 			void HandleSessionRequestReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);
+			void ProcessSessionRequest (size_t len);
 			void HandleSessionRequestPaddingReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);
 			void HandleSessionCreatedSent (const boost::system::error_code& ecode, std::size_t bytes_transferred);
 			void HandleSessionCreatedReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);
+			void ProcessSessionCreated (size_t len);
 			void HandleSessionCreatedPaddingReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);
 			void HandleSessionConfirmedSent (const boost::system::error_code& ecode, std::size_t bytes_transferred);
 			void HandleSessionConfirmedReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);
-
+			void ProcessSessionConfirmed ();
+			void EstablishSessionAfterSessionConfirmed (std::shared_ptr<std::vector<uint8_t> > buf, size_t size);
+			
 			// data
 			void ReceiveLength ();
 			void HandleReceivedLength (const boost::system::error_code& ecode, std::size_t bytes_transferred);
@@ -192,7 +201,7 @@ namespace transport
 			void SendRouterInfo ();
 			void SendTermination (NTCP2TerminationReason reason);
 			void SendTerminationAndTerminate (NTCP2TerminationReason reason);
-			void PostI2NPMessages (std::vector<std::shared_ptr<I2NPMessage> > msgs);
+			void PostI2NPMessages ();
 
 		private:
 
@@ -225,13 +234,28 @@ namespace transport
 			bool m_IsSending, m_IsReceiving;
 			std::list<std::shared_ptr<I2NPMessage> > m_SendQueue;
 			uint64_t m_NextRouterInfoResendTime; // seconds since epoch
-
+			
+			std::list<std::shared_ptr<I2NPMessage> > m_IntermediateQueue; // from transports
+			mutable std::mutex m_IntermediateQueueMutex;
+			
 			uint16_t m_PaddingSizes[16];
 			int m_NextPaddingSize;
 	};
 
 	class NTCP2Server: private i2p::util::RunnableServiceWithWork
 	{
+		private:
+
+			class EstablisherService: public i2p::util::RunnableServiceWithWork
+			{
+				public:
+
+					EstablisherService (): RunnableServiceWithWork ("NTCP2e") {};
+					auto& GetService () { return GetIOService (); };
+					void Start () { StartIOService (); };
+					void Stop () { StopIOService (); };
+			};
+			
 		public:
 
 			enum ProxyType
@@ -240,13 +264,20 @@ namespace transport
 				eSocksProxy,
 				eHTTPProxy
 			};
-
+			
 			NTCP2Server ();
 			~NTCP2Server ();
 
 			void Start ();
 			void Stop ();
-			boost::asio::io_service& GetService () { return GetIOService (); };
+			auto& GetService () { return GetIOService (); };
+			auto& GetEstablisherService () { return m_EstablisherService.GetService (); };
+			std::mt19937& GetRng () { return m_Rng; };
+			void AEADChaCha20Poly1305Encrypt (const std::vector<std::pair<uint8_t *, size_t> >& bufs, 
+				const uint8_t * key, const uint8_t * nonce, uint8_t * mac);
+			bool AEADChaCha20Poly1305Decrypt (const uint8_t * msg, size_t msgLen, const uint8_t * ad, size_t adLen,
+				const uint8_t * key, const uint8_t * nonce, uint8_t * buf, size_t len); 
+			
 
 			bool AddNTCP2Session (std::shared_ptr<NTCP2Session> session, bool incoming = false);
 			void RemoveNTCP2Session (std::shared_ptr<NTCP2Session> session);
@@ -284,8 +315,13 @@ namespace transport
 			uint16_t m_ProxyPort;
 			boost::asio::ip::tcp::resolver m_Resolver;
 			std::unique_ptr<boost::asio::ip::tcp::endpoint> m_ProxyEndpoint;
+			
 			std::shared_ptr<boost::asio::ip::tcp::endpoint> m_Address4, m_Address6, m_YggdrasilAddress;
-
+			std::mt19937 m_Rng;
+			EstablisherService m_EstablisherService;
+			i2p::crypto::AEADChaCha20Poly1305Encryptor m_Encryptor;
+			i2p::crypto::AEADChaCha20Poly1305Decryptor m_Decryptor;
+			
 		public:
 
 			// for HTTP/I2PControl

libi2pd/NetDb.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -10,7 +10,6 @@
 #include <fstream>
 #include <vector>
 #include <map>
-#include <random>
 #include <boost/asio.hpp>
 #include <stdexcept>
 
@@ -40,7 +39,7 @@ namespace data
 
 	NetDb::NetDb (): m_IsRunning (false), m_Thread (nullptr), m_Reseeder (nullptr), 
 		m_Storage("netDb", "r", "routerInfo-", "dat"), m_PersistProfiles (true),
-		m_LastExploratorySelectionUpdateTime (0)
+		m_LastExploratorySelectionUpdateTime (0), m_Rng(i2p::util::GetMonotonicMicroseconds () % 1000000LL)
 	{
 	}
 
@@ -69,7 +68,7 @@ namespace data
 		{
 			Reseed ();
 		}
-		else if (!GetRandomRouter (i2p::context.GetSharedRouterInfo (), false, false))
+		else if (!GetRandomRouter (i2p::context.GetSharedRouterInfo (), false, false, false))
 			Reseed (); // we don't have a router we can connect to. Trying to reseed
 
 		auto it = m_RouterInfos.find (i2p::context.GetIdentHash ());
@@ -118,43 +117,36 @@ namespace data
 	{
 		i2p::util::SetThreadName("NetDB");
 
-		uint64_t lastManage = 0, lastExploratory = 0, lastManageRequest = 0;
-		uint64_t lastProfilesCleanup = i2p::util::GetMonotonicMilliseconds (), lastObsoleteProfilesCleanup = lastProfilesCleanup;
-		int16_t profilesCleanupVariance = 0, obsoleteProfilesCleanVariance = 0, exploratoryIntervalVariance = 0;
+		uint64_t lastManage = 0;
+		uint64_t lastProfilesCleanup = i2p::util::GetMonotonicMilliseconds (), 
+			lastObsoleteProfilesCleanup = lastProfilesCleanup, lastApplyingProfileUpdates = lastProfilesCleanup;
+		int16_t profilesCleanupVariance = 0, obsoleteProfilesCleanVariance = 0, applyingProfileUpdatesVariance = 0;
 
+		std::list<std::shared_ptr<const I2NPMessage> > msgs;
 		while (m_IsRunning)
 		{
 			try
 			{
-				auto msg = m_Queue.GetNextWithTimeout (1000); // 1 sec
-				if (msg)
+				if (m_Queue.Wait (1,0)) // 1 sec
 				{
-					int numMsgs = 0;
-					while (msg)
+					m_Queue.GetWholeQueue (msgs);
+					while (!msgs.empty ())
 					{
+						auto msg = msgs.front (); msgs.pop_front ();
+						if (!msg) continue;
 						LogPrint(eLogDebug, "NetDb: Got request with type ", (int) msg->GetTypeID ());
 						switch (msg->GetTypeID ())
 						{
 							case eI2NPDatabaseStore:
 								HandleDatabaseStoreMsg (msg);
 							break;
-							case eI2NPDatabaseSearchReply:
-								HandleDatabaseSearchReplyMsg (msg);
-							break;
 							case eI2NPDatabaseLookup:
 								HandleDatabaseLookupMsg (msg);
 							break;
-							case eI2NPDummyMsg:
-								// plain RouterInfo from NTCP2 with flags for now
-								HandleNTCP2RouterInfoMsg (msg);
-							break;
 							default: // WTF?
 								LogPrint (eLogError, "NetDb: Unexpected message type ", (int) msg->GetTypeID ());
 								//i2p::HandleI2NPMessage (msg);
 						}
-						if (numMsgs > 100) break;
-						msg = m_Queue.Get ();
-						numMsgs++;
 					}
 				}
 				if (!m_IsRunning) break;
@@ -162,15 +154,6 @@ namespace data
 					continue; // don't manage netdb when offline or transports are not running
 
 				uint64_t mts = i2p::util::GetMonotonicMilliseconds ();
-				if (mts >= lastManageRequest + MANAGE_REQUESTS_INTERVAL*1000)
-				{
-					if (lastManageRequest || i2p::tunnel::tunnels.GetExploratoryPool ()) // expolratory pool is ready?
-					{	
-						if (m_Requests) m_Requests->ManageRequests ();
-						lastManageRequest = mts;
-					}	
-				}
-
 				if (mts >= lastManage + 60000) // manage routers and leasesets every minute
 				{
 					if (lastManage)
@@ -198,7 +181,7 @@ namespace data
 							LogPrint (eLogWarning, "NetDb: Can't persist profiles. Profiles are being saved to disk");
 					}	
 					lastProfilesCleanup = mts;
-					profilesCleanupVariance = rand () % i2p::data::PEER_PROFILE_AUTOCLEAN_VARIANCE;
+					profilesCleanupVariance = m_Rng () % i2p::data::PEER_PROFILE_AUTOCLEAN_VARIANCE;
 				}
 
 				if (mts >= lastObsoleteProfilesCleanup + (uint64_t)(i2p::data::PEER_PROFILE_OBSOLETE_PROFILES_CLEAN_TIMEOUT + obsoleteProfilesCleanVariance)*1000)
@@ -214,29 +197,21 @@ namespace data
 					else
 						LogPrint (eLogWarning, "NetDb: Can't delete profiles. Profiles are being deleted from disk");
 					lastObsoleteProfilesCleanup = mts;
-					obsoleteProfilesCleanVariance = rand () % i2p::data::PEER_PROFILE_OBSOLETE_PROFILES_CLEAN_VARIANCE;
+					obsoleteProfilesCleanVariance = m_Rng () % i2p::data::PEER_PROFILE_OBSOLETE_PROFILES_CLEAN_VARIANCE;
 				}	
-			
-				if (mts >= lastExploratory + NETDB_EXPLORATORY_INTERVAL*1000LL) // check exploratory every 55 seconds
+				if (mts >= lastApplyingProfileUpdates + i2p::data::PEER_PROFILE_APPLY_POSTPONED_TIMEOUT + applyingProfileUpdatesVariance)
 				{
-					auto numRouters = m_RouterInfos.size ();
-					if (!numRouters)
-						throw std::runtime_error("No known routers, reseed seems to be totally failed");
-					else // we have peers now
-						m_FloodfillBootstrap = nullptr;
-					if (numRouters < 2500 || mts >= lastExploratory + (NETDB_EXPLORATORY_INTERVAL + exploratoryIntervalVariance)*1000LL) 
+					bool isApplying = m_ApplyingProfileUpdates.valid ();
+					if (isApplying && m_ApplyingProfileUpdates.wait_for(std::chrono::seconds(0)) == std::future_status::ready) // still active?
 					{
-						if(!i2p::context.IsHidden ())
-						{	
-							numRouters = 800/numRouters;
-							if (numRouters < 1) numRouters = 1;
-							if (numRouters > 9) numRouters = 9;
-							Explore (numRouters);
-						}	
-						lastExploratory = mts;
-						exploratoryIntervalVariance = rand () % NETDB_EXPLORATORY_INTERVAL_VARIANCE;
-					}
-				}
+						m_ApplyingProfileUpdates.get ();
+						isApplying = false;
+					}	
+					if (!isApplying)
+						m_ApplyingProfileUpdates = i2p::data::FlushPostponedRouterProfileUpdates ();
+					lastApplyingProfileUpdates = mts;
+					applyingProfileUpdatesVariance = m_Rng () % i2p::data::PEER_PROFILE_APPLY_POSTPONED_TIMEOUT_VARIANCE;
+				}	
 			}
 			catch (std::exception& ex)
 			{
@@ -319,6 +294,7 @@ namespace data
 			}
 			else
 			{
+				r->CancelBufferToDelete (); // since an update received
 				if (CheckLogLevel (eLogDebug))
 					LogPrint (eLogDebug, "NetDb: RouterInfo is older: ", ident.ToBase64());
 				updated = false;
@@ -332,7 +308,8 @@ namespace data
 			{
 				auto mts = i2p::util::GetMillisecondsSinceEpoch ();
 			    isValid = mts + NETDB_EXPIRATION_TIMEOUT_THRESHOLD*1000LL > r->GetTimestamp () && // from future
-					mts < r->GetTimestamp () + NETDB_MAX_EXPIRATION_TIMEOUT*1000LL; // too old
+					(mts < r->GetTimestamp () + NETDB_MAX_EXPIRATION_TIMEOUT*1000LL || // too old
+					 context.GetUptime () < NETDB_CHECK_FOR_EXPIRATION_UPTIME/10); // enough uptime
 			}
 			if (isValid)	
 			{
@@ -421,8 +398,7 @@ namespace data
 			if (it == m_LeaseSets.end () || it->second->GetStoreType () != storeType ||
 				leaseSet->GetPublishedTimestamp () > it->second->GetPublishedTimestamp ())
 			{
-				if (leaseSet->IsPublic () && !leaseSet->IsExpired () &&
-				     i2p::util::GetSecondsSinceEpoch () + NETDB_EXPIRATION_TIMEOUT_THRESHOLD > leaseSet->GetPublishedTimestamp ())
+				if (leaseSet->IsPublic () && !leaseSet->IsExpired ())
 				{
 					// TODO: implement actual update
 					if (CheckLogLevel (eLogInfo))
@@ -511,35 +487,13 @@ namespace data
 			m_Reseeder->LoadCertificates (); // we need certificates for SU3 verification
 		}
 
-		// try reseeding from floodfill first if specified
-		std::string riPath; i2p::config::GetOption("reseed.floodfill", riPath);
-		if (!riPath.empty())
-		{
-			auto ri = std::make_shared<RouterInfo>(riPath);
-			if (ri->IsFloodfill())
-			{
-				const uint8_t * riData = ri->GetBuffer();
-				int riLen = ri->GetBufferLen();
-				if (!i2p::data::netdb.AddRouterInfo(riData, riLen))
-				{
-					// bad router info
-					LogPrint(eLogError, "NetDb: Bad router info");
-					return;
-				}
-				m_FloodfillBootstrap = ri;
-				//ReseedFromFloodfill(*ri);
-				// don't try reseed servers if trying to bootstrap from floodfill
-				return;
-			}
-		}
-
 		m_Reseeder->Bootstrap ();
 	}
 
 	void NetDb::ReseedFromFloodfill(const RouterInfo & ri, int numRouters, int numFloodfills)
 	{
 		LogPrint(eLogInfo, "NetDB: Reseeding from floodfill ", ri.GetIdentHashBase64());
-		std::vector<std::shared_ptr<i2p::I2NPMessage> > requests;
+		std::list<std::shared_ptr<i2p::I2NPMessage> > requests;
 
 		i2p::data::IdentHash ourIdent = i2p::context.GetIdentHash();
 		i2p::data::IdentHash ih = ri.GetIdentHash();
@@ -562,7 +516,7 @@ namespace data
 		}
 
 		// send them off
-		i2p::transport::transports.SendMessages(ih, requests);
+		i2p::transport::transports.SendMessages(ih, std::move (requests));
 	}
 
 	bool NetDb::LoadRouterInfo (const std::string& path, uint64_t ts)
@@ -617,7 +571,7 @@ namespace data
 		while(n > 0)
 		{
 			std::lock_guard<std::mutex> lock(m_RouterInfosMutex);
-			uint32_t idx = rand () % m_RouterInfos.size ();
+			uint32_t idx = m_Rng () % m_RouterInfos.size ();
 			uint32_t i = 0;
 			for (const auto & it : m_RouterInfos) {
 				if(i >= idx) // are we at the random start point?
@@ -697,70 +651,79 @@ namespace data
 		if (checkForExpiration && uptime > i2p::transport::SSU2_TO_INTRODUCER_SESSION_DURATION) // 1 hour
 			expirationTimeout = i2p::context.IsFloodfill () ? NETDB_FLOODFILL_EXPIRATION_TIMEOUT*1000LL :
 				NETDB_MIN_EXPIRATION_TIMEOUT*1000LL + (NETDB_MAX_EXPIRATION_TIMEOUT - NETDB_MIN_EXPIRATION_TIMEOUT)*1000LL*NETDB_MIN_ROUTERS/total;
-
+		bool isOffline = checkForExpiration && i2p::transport::transports.GetNumPeers () < NETDB_MIN_TRANSPORTS; // enough routers and uptime, but no transports
+			
 		std::list<std::pair<std::string, std::shared_ptr<RouterInfo::Buffer> > > saveToDisk;
 		std::list<std::string> removeFromDisk;	
 			
 		auto own = i2p::context.GetSharedRouterInfo ();
-		for (auto& it: m_RouterInfos)
+		for (auto [ident, r]: m_RouterInfos)
 		{
-			if (!it.second || it.second == own) continue; // skip own
-			std::string ident = it.second->GetIdentHashBase64();
-			if (it.second->IsUpdated ())
+			if (!r || r == own) continue; // skip own
+			if (r->IsBufferScheduledToDelete ()) // from previous SaveUpdated, we assume m_PersistingRouters complete
 			{
-				if (it.second->GetBuffer ())
+				std::lock_guard<std::mutex> l(m_RouterInfosMutex); // possible collision between DeleteBuffer and Update
+				r->DeleteBuffer ();
+			}	
+			if (r->IsUpdated ())
+			{
+				if (r->GetBuffer () && !r->IsUnreachable ())
 				{
 					// we have something to save
 					std::shared_ptr<RouterInfo::Buffer> buffer;
 					{
 						std::lock_guard<std::mutex> l(m_RouterInfosMutex); // possible collision between DeleteBuffer and Update
-						buffer = it.second->GetSharedBuffer ();
-						it.second->DeleteBuffer ();
+						buffer = r->CopyBuffer ();
 					}
-					if (buffer && !it.second->IsUnreachable ()) // don't save bad router
-						saveToDisk.push_back(std::make_pair(ident, buffer));
-					it.second->SetUnreachable (false);
+					if (!i2p::transport::transports.IsConnected (ident))
+						r->ScheduleBufferToDelete ();
+					if (buffer)
+						saveToDisk.emplace_back(ident.ToBase64 (), buffer);
 				}
-				it.second->SetUpdated (false);
+				r->SetUpdated (false);
 				updatedCount++;
 				continue;
 			}
-			if (it.second->GetProfile ()->IsUnreachable ())
-				it.second->SetUnreachable (true);
+			else if (r->GetBuffer () && ts > r->GetTimestamp () + NETDB_MIN_EXPIRATION_TIMEOUT*1000LL)
+				// since update was long time ago we assume that router is not connected anymore
+				r->ScheduleBufferToDelete ();
+			
+			if (r->GetProfile ()->IsUnreachable ())
+				r->SetUnreachable (true);
 			// make router reachable back if too few routers or floodfills
-			if (it.second->IsUnreachable () && (total - deletedCount < NETDB_MIN_ROUTERS || isLowRate ||
-				(it.second->IsFloodfill () && totalFloodfills - deletedFloodfillsCount < NETDB_MIN_FLOODFILLS)))
-				it.second->SetUnreachable (false);
-			if (!it.second->IsUnreachable ())
+			if (r->IsUnreachable () && (total - deletedCount < NETDB_MIN_ROUTERS || isLowRate || isOffline ||
+				(r->IsFloodfill () && totalFloodfills - deletedFloodfillsCount < NETDB_MIN_FLOODFILLS)))
+				r->SetUnreachable (false);
+			if (!r->IsUnreachable ())
 			{
 				// find & mark expired routers
-				if (!it.second->GetCompatibleTransports (true)) // non reachable by any transport
-					it.second->SetUnreachable (true);
-				else if (ts + NETDB_EXPIRATION_TIMEOUT_THRESHOLD*1000LL < it.second->GetTimestamp ())
+				if (!r->GetCompatibleTransports (true)) // non reachable by any transport
+					r->SetUnreachable (true);
+				else if (ts + NETDB_EXPIRATION_TIMEOUT_THRESHOLD*1000LL < r->GetTimestamp ())
 				{
-					LogPrint (eLogWarning, "NetDb: RouterInfo is from future for ", (it.second->GetTimestamp () - ts)/1000LL, " seconds");
-					it.second->SetUnreachable (true);
+					LogPrint (eLogWarning, "NetDb: RouterInfo is from future for ", (r->GetTimestamp () - ts)/1000LL, " seconds");
+					r->SetUnreachable (true);
 				}
 				else if (checkForExpiration) 
 				{	
-					if (ts > it.second->GetTimestamp () + expirationTimeout)
-						it.second->SetUnreachable (true);
-					else if ((ts > it.second->GetTimestamp () + expirationTimeout/2) && // more than half of expiration
-						total > NETDB_NUM_ROUTERS_THRESHOLD && !it.second->IsHighBandwidth() &&  // low bandwidth
-						!it.second->IsFloodfill() && (!i2p::context.IsFloodfill () || // non floodfill 
-					    (CreateRoutingKey (it.second->GetIdentHash ()) ^ i2p::context.GetIdentHash ()).metric[0] >= 0x02)) // different first 7 bits 
-							it.second->SetUnreachable (true);
+					if (ts > r->GetTimestamp () + expirationTimeout)
+						r->SetUnreachable (true);
+					else if ((ts > r->GetTimestamp () + expirationTimeout/2) && // more than half of expiration
+						total > NETDB_NUM_ROUTERS_THRESHOLD && !r->IsHighBandwidth() &&  // low bandwidth
+						!r->IsFloodfill() && (!i2p::context.IsFloodfill () || // non floodfill 
+					    (CreateRoutingKey (ident) ^ i2p::context.GetIdentHash ()).metric[0] >= 0x02)) // different first 7 bits 
+							r->SetUnreachable (true);
 				}	
 			}
 			// make router reachable back if connected now
-			if (it.second->IsUnreachable () && i2p::transport::transports.IsConnected (it.second->GetIdentHash ()))
-				it.second->SetUnreachable (false);
+			if (r->IsUnreachable () && i2p::transport::transports.IsConnected (ident))
+				r->SetUnreachable (false);
 			
-			if (it.second->IsUnreachable ())
+			if (r->IsUnreachable ())
 			{
-				if (it.second->IsFloodfill ()) deletedFloodfillsCount++;
+				if (r->IsFloodfill ()) deletedFloodfillsCount++;
 				// delete RI file
-				removeFromDisk.push_back (ident);
+				removeFromDisk.emplace_back (ident.ToBase64());
 				deletedCount++;
 				if (total - deletedCount < NETDB_MIN_ROUTERS) checkForExpiration = false;
 			}
@@ -818,69 +781,12 @@ namespace data
 	
 	void NetDb::RequestDestination (const IdentHash& destination, RequestedDestination::RequestComplete requestComplete, bool direct)
 	{
-		if (direct && i2p::transport::transports.RoutesRestricted ()) direct = false; // always use tunnels for restricted routes
-		auto dest = m_Requests->CreateRequest (destination, false, direct, requestComplete); // non-exploratory
-		if (!dest)
-		{
-			LogPrint (eLogWarning, "NetDb: Destination ", destination.ToBase64(), " is requested already or cached");
-			return;
-		}
-
-		auto floodfill = GetClosestFloodfill (destination, dest->GetExcludedPeers ());
-		if (floodfill)
-		{
-			if (direct && !floodfill->IsReachableFrom (i2p::context.GetRouterInfo ()) &&
-				!i2p::transport::transports.IsConnected (floodfill->GetIdentHash ()))
-				direct = false; // floodfill can't be reached directly
-			if (direct)
-			{
-				if (CheckLogLevel (eLogDebug))
-					LogPrint (eLogDebug, "NetDb: Request ", dest->GetDestination ().ToBase64 (), " at ", floodfill->GetIdentHash ().ToBase64 (), " directly");
-				auto msg = dest->CreateRequestMessage (floodfill->GetIdentHash ());
-				msg->onDrop = [this, dest]() { if (dest->IsActive ()) this->m_Requests->SendNextRequest (dest); }; 
-				transports.SendMessage (floodfill->GetIdentHash (), msg);
-			}	
-			else
-			{
-				auto pool = i2p::tunnel::tunnels.GetExploratoryPool ();
-				auto outbound = pool ? pool->GetNextOutboundTunnel (nullptr, floodfill->GetCompatibleTransports (false)) : nullptr;
-				auto inbound = pool ? pool->GetNextInboundTunnel (nullptr, floodfill->GetCompatibleTransports (true)) : nullptr;
-				if (outbound &&	inbound)
-				{
-					if (CheckLogLevel (eLogDebug))
-						LogPrint (eLogDebug, "NetDb: Request ", dest->GetDestination ().ToBase64 (), " at ", floodfill->GetIdentHash ().ToBase64 (), " through tunnels");
-					auto msg = dest->CreateRequestMessage (floodfill, inbound);
-					msg->onDrop = [this, dest]() { if (dest->IsActive ()) this->m_Requests->SendNextRequest (dest); }; 
-					outbound->SendTunnelDataMsgTo (floodfill->GetIdentHash (), 0,
-						i2p::garlic::WrapECIESX25519MessageForRouter (msg, floodfill->GetIdentity ()->GetEncryptionPublicKey ()));
-				}
-				else
-				{
-					LogPrint (eLogError, "NetDb: ", destination.ToBase64(), " destination requested, but no tunnels found");
-					m_Requests->RequestComplete (destination, nullptr);
-				}
-			}
-		}
+		if (direct && (i2p::transport::transports.RoutesRestricted () || i2p::context.IsLimitedConnectivity ())) 
+		    direct = false; // always use tunnels for restricted routes or limited connectivity
+		if (m_Requests)
+			m_Requests->PostRequestDestination (destination, requestComplete, direct);
 		else
-		{
-			LogPrint (eLogError, "NetDb: ", destination.ToBase64(), " destination requested, but no floodfills found");
-			m_Requests->RequestComplete (destination, nullptr);
-		}
-	}
-
-	void NetDb::RequestDestinationFrom (const IdentHash& destination, const IdentHash & from, bool exploratory, RequestedDestination::RequestComplete requestComplete)
-	{
-
-		auto dest = m_Requests->CreateRequest (destination, exploratory, true, requestComplete); // non-exploratory
-		if (!dest)
-		{
-			LogPrint (eLogWarning, "NetDb: Destination ", destination.ToBase64(), " is requested already");
-			return;
-		}
-		if (CheckLogLevel (eLogDebug))
-			LogPrint(eLogDebug, "NetDb: Destination ", destination.ToBase64(), " being requested directly from ", from.ToBase64());
-		// direct
-		transports.SendMessage (from, dest->CreateRequestMessage (nullptr, nullptr));
+			LogPrint (eLogError, "NetDb: Requests is null");
 	}
 
 	void NetDb::HandleNTCP2RouterInfoMsg (std::shared_ptr<const I2NPMessage> m)
@@ -1025,69 +931,16 @@ namespace data
 			{
 				memcpy (payload + DATABASE_STORE_HEADER_SIZE, buf + payloadOffset, msgLen);
 				floodMsg->FillI2NPMessageHeader (eI2NPDatabaseStore);
-				Flood (ident, floodMsg);
+				int minutesBeforeMidnight = 24*60 - i2p::util::GetMinutesSinceEpoch () % (24*60);
+				bool andNextDay = storeType ? minutesBeforeMidnight < NETDB_NEXT_DAY_LEASESET_THRESHOLD:
+					minutesBeforeMidnight < NETDB_NEXT_DAY_ROUTER_INFO_THRESHOLD;
+				Flood (ident, floodMsg, andNextDay);
 			}
 			else
 				LogPrint (eLogError, "NetDb: Database store message is too long ", floodMsg->len);
 		}
 	}
-
-	void NetDb::HandleDatabaseSearchReplyMsg (std::shared_ptr<const I2NPMessage> msg)
-	{
-		const uint8_t * buf = msg->GetPayload ();
-		char key[48];
-		int l = i2p::data::ByteStreamToBase64 (buf, 32, key, 48);
-		key[l] = 0;
-		size_t num = buf[32]; // num
-		LogPrint (eLogDebug, "NetDb: DatabaseSearchReply for ", key, " num=", num);
-		IdentHash ident (buf);
-		auto dest = m_Requests->FindRequest (ident);
-		if (dest && dest->IsActive ())
-		{
-			if (!dest->IsExploratory () && (num > 0 || dest->GetNumExcludedPeers () < 3)) // before 3-rd attempt might be just bad luck
-				// try to send next requests
-				m_Requests->SendNextRequest (dest);
-			else
-				// no more requests for destination possible. delete it
-				m_Requests->RequestComplete (ident, nullptr);
-		}
-		else if (!m_FloodfillBootstrap)
-		{	
-			LogPrint (eLogInfo, "NetDb: Unsolicited or late database search reply for ", key);
-			return;
-		}	
-
-		// try responses
-		if (num > NETDB_MAX_NUM_SEARCH_REPLY_PEER_HASHES)
-		{
-			LogPrint (eLogWarning, "NetDb: Too many peer hashes ", num, " in database search reply, Reduced to ", NETDB_MAX_NUM_SEARCH_REPLY_PEER_HASHES);
-			num = NETDB_MAX_NUM_SEARCH_REPLY_PEER_HASHES;
-		}	
-		for (size_t i = 0; i < num; i++)
-		{
-			const uint8_t * router = buf + 33 + i*32;
-			char peerHash[48];
-			int l1 = i2p::data::ByteStreamToBase64 (router, 32, peerHash, 48);
-			peerHash[l1] = 0;
-			LogPrint (eLogDebug, "NetDb: ", i, ": ", peerHash);
-
-			auto r = FindRouter (router);
-			if (!r || i2p::util::GetMillisecondsSinceEpoch () > r->GetTimestamp () + 3600*1000LL)
-			{
-				// router with ident not found or too old (1 hour)
-				LogPrint (eLogDebug, "NetDb: Found new/outdated router. Requesting RouterInfo...");
-				if(m_FloodfillBootstrap)
-					RequestDestinationFrom(router, m_FloodfillBootstrap->GetIdentHash(), true);
-				else if (!IsRouterBanned (router))
-					RequestDestination (router);
-				else
-					LogPrint (eLogDebug, "NetDb: Router ", peerHash, " is banned. Skipped");
-			}
-			else
-				LogPrint (eLogDebug, "NetDb: [:|||:]");
-		}
-	}
-
+	
 	void NetDb::HandleDatabaseLookupMsg (std::shared_ptr<const I2NPMessage> msg)
 	{
 		const uint8_t * buf = msg->GetPayload ();
@@ -1131,7 +984,7 @@ namespace data
 				return;
 			}	
 			LogPrint (eLogInfo, "NetDb: Exploratory close to ", key, " ", numExcluded, " excluded");
-			std::set<IdentHash> excludedRouters;
+			std::unordered_set<IdentHash> excludedRouters;
 			const uint8_t * excluded_ident = excluded;
 			for (int i = 0; i < numExcluded; i++)
 			{
@@ -1183,7 +1036,7 @@ namespace data
 
 			if (!replyMsg)
 			{
-				std::set<IdentHash> excludedRouters;
+				std::unordered_set<IdentHash> excludedRouters;
 				const uint8_t * exclude_ident = excluded;
 				for (int i = 0; i < numExcluded; i++)
 				{
@@ -1250,74 +1103,43 @@ namespace data
 		}
 	}
 
-	void NetDb::Explore (int numDestinations)
+	void NetDb::Flood (const IdentHash& ident, std::shared_ptr<I2NPMessage> floodMsg, bool andNextDay)
 	{
-		// new requests
-		auto exploratoryPool = i2p::tunnel::tunnels.GetExploratoryPool ();
-		auto outbound = exploratoryPool ? exploratoryPool->GetNextOutboundTunnel () : nullptr;
-		auto inbound = exploratoryPool ? exploratoryPool->GetNextInboundTunnel () : nullptr;
-		bool throughTunnels = outbound && inbound;
-
-		uint8_t randomHash[32];
-		std::vector<i2p::tunnel::TunnelMessageBlock> msgs;
-		LogPrint (eLogInfo, "NetDb: Exploring new ", numDestinations, " routers ...");
-		for (int i = 0; i < numDestinations; i++)
-		{
-			RAND_bytes (randomHash, 32);
-			auto dest = m_Requests->CreateRequest (randomHash, true, !throughTunnels); // exploratory
-			if (!dest)
-			{
-				LogPrint (eLogWarning, "NetDb: Exploratory destination is requested already");
-				return;
-			}
-			auto floodfill = GetClosestFloodfill (randomHash, dest->GetExcludedPeers ());
-			if (floodfill)
-			{
-				if (i2p::transport::transports.IsConnected (floodfill->GetIdentHash ()))
-					throughTunnels = false;
-				if (throughTunnels)
-				{
-					msgs.push_back (i2p::tunnel::TunnelMessageBlock
-						{
-							i2p::tunnel::eDeliveryTypeRouter,
-							floodfill->GetIdentHash (), 0,
-							CreateDatabaseStoreMsg () // tell floodfill about us
-						});
-					msgs.push_back (i2p::tunnel::TunnelMessageBlock
-						{
-							i2p::tunnel::eDeliveryTypeRouter,
-							floodfill->GetIdentHash (), 0,
-							dest->CreateRequestMessage (floodfill, inbound) // explore
-						});
-				}
-				else
-					i2p::transport::transports.SendMessage (floodfill->GetIdentHash (), dest->CreateRequestMessage (floodfill->GetIdentHash ()));
-			}
-			else
-				m_Requests->RequestComplete (randomHash, nullptr);
-		}
-		if (throughTunnels && msgs.size () > 0)
-			outbound->SendTunnelDataMsgs (msgs);
-	}
-
-	void NetDb::Flood (const IdentHash& ident, std::shared_ptr<I2NPMessage> floodMsg)
-	{
-		std::set<IdentHash> excluded;
+		std::unordered_set<IdentHash> excluded;
 		excluded.insert (i2p::context.GetIdentHash ()); // don't flood to itself
 		excluded.insert (ident); // don't flood back
 		for (int i = 0; i < 3; i++)
 		{
-			auto floodfill = GetClosestFloodfill (ident, excluded);
+			auto floodfill = GetClosestFloodfill (ident, excluded, false); // current day
 			if (floodfill)
 			{
-				auto h = floodfill->GetIdentHash();
-				LogPrint(eLogDebug, "NetDb: Flood lease set for ", ident.ToBase32(), " to ", h.ToBase64());
+				const auto& h = floodfill->GetIdentHash();
 				transports.SendMessage (h, CopyI2NPMessage(floodMsg));
 				excluded.insert (h);
 			}
 			else
-				break;
+				return; // no more floodfills
 		}
+		if (andNextDay)
+		{
+			// flood to two more closest flodfills for next day 
+			std::unordered_set<IdentHash> excluded1;
+			excluded1.insert (i2p::context.GetIdentHash ()); // don't flood to itself
+			excluded1.insert (ident); // don't flood back
+			for (int i = 0; i < 2; i++)
+			{
+				auto floodfill = GetClosestFloodfill (ident, excluded1, true); // next day
+				if (floodfill)
+				{
+					const auto& h = floodfill->GetIdentHash();
+					if (!excluded.count (h)) // we didn't send for current day, otherwise skip
+						transports.SendMessage (h, CopyI2NPMessage(floodMsg));
+					excluded1.insert (h);
+				}
+				else
+					return;
+			}	
+		}	
 	}
 
 	std::shared_ptr<const RouterInfo> NetDb::GetRandomRouter () const
@@ -1330,20 +1152,23 @@ namespace data
 	}
 
 	std::shared_ptr<const RouterInfo> NetDb::GetRandomRouter (std::shared_ptr<const RouterInfo> compatibleWith,
-		bool reverse, bool endpoint) const
+		bool reverse, bool endpoint, bool clientTunnel) const
 	{
+		bool checkIsReal = clientTunnel && i2p::tunnel::tunnels.GetPreciseTunnelCreationSuccessRate () < NETDB_TUNNEL_CREATION_RATE_THRESHOLD && // too low rate
+			context.GetUptime () > NETDB_CHECK_FOR_EXPIRATION_UPTIME; // after 10 minutes uptime
 		return GetRandomRouter (
-			[compatibleWith, reverse, endpoint](std::shared_ptr<const RouterInfo> router)->bool
+			[compatibleWith, reverse, endpoint, clientTunnel, checkIsReal](std::shared_ptr<const RouterInfo> router)->bool
 			{
 				return !router->IsHidden () && router != compatibleWith &&
 					(reverse ? (compatibleWith->IsReachableFrom (*router) && router->GetCompatibleTransports (true)):
 						router->IsReachableFrom (*compatibleWith)) && !router->IsNAT2NATOnly (*compatibleWith) &&
-					router->IsECIES () && !router->IsHighCongestion (false) &&
+					router->IsECIES () && !router->IsHighCongestion (clientTunnel) &&
+					(!checkIsReal || router->GetProfile ()->IsReal ()) &&
 					(!endpoint || (router->IsV4 () && (!reverse || router->IsPublished (true)))); // endpoint must be ipv4 and published if inbound(reverse)
 			});
 	}
 
-	std::shared_ptr<const RouterInfo> NetDb::GetRandomSSU2PeerTestRouter (bool v4, const std::set<IdentHash>& excluded) const
+	std::shared_ptr<const RouterInfo> NetDb::GetRandomSSU2PeerTestRouter (bool v4, const std::unordered_set<IdentHash>& excluded) const
 	{
 		return GetRandomRouter (
 			[v4, &excluded](std::shared_ptr<const RouterInfo> router)->bool
@@ -1353,7 +1178,7 @@ namespace data
 			});
 	}
 
-	std::shared_ptr<const RouterInfo> NetDb::GetRandomSSU2Introducer (bool v4, const std::set<IdentHash>& excluded) const
+	std::shared_ptr<const RouterInfo> NetDb::GetRandomSSU2Introducer (bool v4, const std::unordered_set<IdentHash>& excluded) const
 	{
 		return GetRandomRouter (
 			[v4, &excluded](std::shared_ptr<const RouterInfo> router)->bool
@@ -1448,10 +1273,16 @@ namespace data
 		if (msg) m_Queue.Put (msg);
 	}
 
-	std::shared_ptr<const RouterInfo> NetDb::GetClosestFloodfill (const IdentHash& destination,
-		const std::set<IdentHash>& excluded) const
+	void NetDb::PostDatabaseSearchReplyMsg (std::shared_ptr<const I2NPMessage> msg)
 	{
-		IdentHash destKey = CreateRoutingKey (destination);
+		if (msg && m_Requests)
+			m_Requests->PostDatabaseSearchReplyMsg (msg);
+	}	
+	
+	std::shared_ptr<const RouterInfo> NetDb::GetClosestFloodfill (const IdentHash& destination,
+		const std::unordered_set<IdentHash>& excluded, bool nextDay) const
+	{
+		IdentHash destKey = CreateRoutingKey (destination, nextDay);
 		std::lock_guard<std::mutex> l(m_FloodfillsMutex);
 		return m_Floodfills.FindClosest (destKey, [&excluded](const std::shared_ptr<RouterInfo>& r)->bool
 			{
@@ -1461,7 +1292,7 @@ namespace data
 	}
 
 	std::vector<IdentHash> NetDb::GetClosestFloodfills (const IdentHash& destination, size_t num,
-		std::set<IdentHash>& excluded, bool closeThanUsOnly) const
+		std::unordered_set<IdentHash>& excluded, bool closeThanUsOnly) const
 	{
 		std::vector<IdentHash> res;
 		IdentHash destKey = CreateRoutingKey (destination);
@@ -1496,7 +1327,7 @@ namespace data
 	}
 
 	std::vector<IdentHash> NetDb::GetExploratoryNonFloodfill (const IdentHash& destination, 
-		size_t num, const std::set<IdentHash>& excluded)
+		size_t num, const std::unordered_set<IdentHash>& excluded)
 	{
 		std::vector<IdentHash> ret;
 		if (!num || m_RouterInfos.empty ()) return ret; // empty list
@@ -1505,12 +1336,8 @@ namespace data
 		{
 			// update selection
 			m_ExploratorySelection.clear ();
-#if (__cplusplus >= 201703L) // C++ 17 or higher
 			std::vector<std::shared_ptr<const RouterInfo> > eligible;
-			eligible.reserve (m_RouterInfos.size ());
-#else		
-			auto& eligible = m_ExploratorySelection;
-#endif			
+			eligible.reserve (m_RouterInfos.size ());		
 			{
 				// collect eligible from current netdb
 				bool checkIsReal = i2p::tunnel::tunnels.GetPreciseTunnelCreationSuccessRate () < NETDB_TUNNEL_CREATION_RATE_THRESHOLD; // too low rate
@@ -1520,22 +1347,13 @@ namespace data
 					 	(!checkIsReal || (it.second->HasProfile () && it.second->GetProfile ()->IsReal ())))
 							eligible.push_back (it.second);
 			}
-#if (__cplusplus >= 201703L) // C++ 17 or higher
 			if (eligible.size () > NETDB_MAX_EXPLORATORY_SELECTION_SIZE)
 			{
 				 std::sample (eligible.begin(), eligible.end(), std::back_inserter(m_ExploratorySelection),
-				 	NETDB_MAX_EXPLORATORY_SELECTION_SIZE, std::mt19937(ts));
+				 	NETDB_MAX_EXPLORATORY_SELECTION_SIZE, m_Rng);
 			}	
 			else
-				std::swap (m_ExploratorySelection, eligible);
-#else			
-			if (m_ExploratorySelection.size () > NETDB_MAX_EXPLORATORY_SELECTION_SIZE)
-			{
-				// reduce number of eligible to max selection size
-				std::shuffle (m_ExploratorySelection.begin(), m_ExploratorySelection.end(), std::mt19937(ts));
-				m_ExploratorySelection.resize (NETDB_MAX_EXPLORATORY_SELECTION_SIZE);
-			}	
-#endif			
+				std::swap (m_ExploratorySelection, eligible);	
 			m_LastExploratorySelectionUpdateTime = ts;
 		}	
 		

libi2pd/NetDb.hpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -10,12 +10,13 @@
 #define NETDB_H__
 // this file is called NetDb.hpp to resolve conflict with libc's netdb.h on case insensitive fs
 #include <inttypes.h>
-#include <set>
+#include <unordered_set>
 #include <unordered_map>
 #include <string>
 #include <thread>
 #include <mutex>
 #include <future>
+#include <random>
 
 #include "Base.h"
 #include "Gzip.h"
@@ -39,7 +40,8 @@ namespace data
 {
 	const int NETDB_MIN_ROUTERS = 90;
 	const int NETDB_MIN_FLOODFILLS = 5;
-	const int NETDB_NUM_FLOODFILLS_THRESHOLD = 1000;
+	const int NETDB_MIN_TRANSPORTS = 10 ; // otherwise assume offline
+	const int NETDB_NUM_FLOODFILLS_THRESHOLD = 1200;
 	const int NETDB_NUM_ROUTERS_THRESHOLD = 4*NETDB_NUM_FLOODFILLS_THRESHOLD;
 	const int NETDB_TUNNEL_CREATION_RATE_THRESHOLD = 10; // in %
 	const int NETDB_CHECK_FOR_EXPIRATION_UPTIME = 600; // 10 minutes, in seconds  
@@ -48,14 +50,15 @@ namespace data
 	const int NETDB_MAX_EXPIRATION_TIMEOUT = 27 * 60 * 60; // 27 hours
 	const int NETDB_MAX_OFFLINE_EXPIRATION_TIMEOUT = 180; // in days
 	const int NETDB_EXPIRATION_TIMEOUT_THRESHOLD = 2*60; // 2 minutes
-	const int NETDB_EXPLORATORY_INTERVAL = 55; // in seconds
-	const int NETDB_EXPLORATORY_INTERVAL_VARIANCE = 170; // in seconds 
-	const int NETDB_MIN_HIGHBANDWIDTH_VERSION = MAKE_VERSION_NUMBER(0, 9, 51); // 0.9.51
-	const int NETDB_MIN_FLOODFILL_VERSION = MAKE_VERSION_NUMBER(0, 9, 51); // 0.9.51
+	const int NETDB_MIN_HIGHBANDWIDTH_VERSION = MAKE_VERSION_NUMBER(0, 9, 58); // 0.9.58
+	const int NETDB_MIN_FLOODFILL_VERSION = MAKE_VERSION_NUMBER(0, 9, 59); // 0.9.59
 	const int NETDB_MIN_SHORT_TUNNEL_BUILD_VERSION = MAKE_VERSION_NUMBER(0, 9, 51); // 0.9.51
+	const int NETDB_MIN_PEER_TEST_VERSION = MAKE_VERSION_NUMBER(0, 9, 62); // 0.9.62
 	const size_t NETDB_MAX_NUM_SEARCH_REPLY_PEER_HASHES = 16;
 	const size_t NETDB_MAX_EXPLORATORY_SELECTION_SIZE = 500;
-	const int NETDB_EXPLORATORY_SELECTION_UPDATE_INTERVAL = 82; // in seconds
+	const int NETDB_EXPLORATORY_SELECTION_UPDATE_INTERVAL = 82; // in seconds. for floodfill
+	const int NETDB_NEXT_DAY_ROUTER_INFO_THRESHOLD = 45; // in minutes
+	const int NETDB_NEXT_DAY_LEASESET_THRESHOLD = 10; // in minutes
 
 	/** function for visiting a leaseset stored in a floodfill */
 	typedef std::function<void(const IdentHash, std::shared_ptr<LeaseSet>)> LeaseSetVisitor;
@@ -85,27 +88,22 @@ namespace data
 			std::shared_ptr<RouterProfile> FindRouterProfile (const IdentHash& ident) const;
 
 			void RequestDestination (const IdentHash& destination, RequestedDestination::RequestComplete requestComplete = nullptr, bool direct = true);
-			void RequestDestinationFrom (const IdentHash& destination, const IdentHash & from, bool exploritory, RequestedDestination::RequestComplete requestComplete = nullptr);
-
-			void HandleDatabaseStoreMsg (std::shared_ptr<const I2NPMessage> msg);
-			void HandleDatabaseSearchReplyMsg (std::shared_ptr<const I2NPMessage> msg);
-			void HandleDatabaseLookupMsg (std::shared_ptr<const I2NPMessage> msg);
-			void HandleNTCP2RouterInfoMsg (std::shared_ptr<const I2NPMessage> m);
-
+			
 			std::shared_ptr<const RouterInfo> GetRandomRouter () const;
-			std::shared_ptr<const RouterInfo> GetRandomRouter (std::shared_ptr<const RouterInfo> compatibleWith, bool reverse, bool endpoint) const;
+			std::shared_ptr<const RouterInfo> GetRandomRouter (std::shared_ptr<const RouterInfo> compatibleWith, bool reverse, bool endpoint, bool clientTunnel) const;
 			std::shared_ptr<const RouterInfo> GetHighBandwidthRandomRouter (std::shared_ptr<const RouterInfo> compatibleWith, bool reverse, bool endpoint) const;
-			std::shared_ptr<const RouterInfo> GetRandomSSU2PeerTestRouter (bool v4, const std::set<IdentHash>& excluded) const;
-			std::shared_ptr<const RouterInfo> GetRandomSSU2Introducer (bool v4, const std::set<IdentHash>& excluded) const;
-			std::shared_ptr<const RouterInfo> GetClosestFloodfill (const IdentHash& destination, const std::set<IdentHash>& excluded) const;
+			std::shared_ptr<const RouterInfo> GetRandomSSU2PeerTestRouter (bool v4, const std::unordered_set<IdentHash>& excluded) const;
+			std::shared_ptr<const RouterInfo> GetRandomSSU2Introducer (bool v4, const std::unordered_set<IdentHash>& excluded) const;
+			std::shared_ptr<const RouterInfo> GetClosestFloodfill (const IdentHash& destination, const std::unordered_set<IdentHash>& excluded, bool nextDay = false) const;
 			std::vector<IdentHash> GetClosestFloodfills (const IdentHash& destination, size_t num,
-				std::set<IdentHash>& excluded, bool closeThanUsOnly = false) const;
-			std::vector<IdentHash> GetExploratoryNonFloodfill (const IdentHash& destination, size_t num, const std::set<IdentHash>& excluded);
+				std::unordered_set<IdentHash>& excluded, bool closeThanUsOnly = false) const;
+			std::vector<IdentHash> GetExploratoryNonFloodfill (const IdentHash& destination, size_t num, const std::unordered_set<IdentHash>& excluded);
 			std::shared_ptr<const RouterInfo> GetRandomRouterInFamily (FamilyID fam) const;
 			void SetUnreachable (const IdentHash& ident, bool unreachable);
 			void ExcludeReachableTransports (const IdentHash& ident, RouterInfo::CompatibleTransports transports);
 
 			void PostI2NPMsg (std::shared_ptr<const I2NPMessage> msg);
+			void PostDatabaseSearchReplyMsg (std::shared_ptr<const I2NPMessage> msg); // to NetdbReq thread
 
 			void Reseed ();
 			Families& GetFamilies () { return m_Families; };
@@ -125,22 +123,24 @@ namespace data
 			size_t VisitRandomRouterInfos(RouterInfoFilter f, RouterInfoVisitor v, size_t n);
 
 			void ClearRouterInfos () { m_RouterInfos.clear (); };
-			std::shared_ptr<RouterInfo::Buffer> NewRouterInfoBuffer () { return m_RouterInfoBuffersPool.AcquireSharedMt (); };
+			template<typename... TArgs>
+			std::shared_ptr<RouterInfo::Buffer> NewRouterInfoBuffer (TArgs&&... args) 
+			{ 
+				return m_RouterInfoBuffersPool.AcquireSharedMt (std::forward<TArgs>(args)...); 
+			}
 			bool PopulateRouterInfoBuffer (std::shared_ptr<RouterInfo> r);
 			std::shared_ptr<RouterInfo::Address> NewRouterInfoAddress () { return m_RouterInfoAddressesPool.AcquireSharedMt (); };
-			boost::shared_ptr<RouterInfo::Addresses> NewRouterInfoAddresses ()
+			RouterInfo::AddressesPtr NewRouterInfoAddresses ()
 			{
-				return boost::shared_ptr<RouterInfo::Addresses>(m_RouterInfoAddressVectorsPool.AcquireMt (),
+				return RouterInfo::AddressesPtr{m_RouterInfoAddressVectorsPool.AcquireMt (),
 					std::bind <void (i2p::util::MemoryPoolMt<RouterInfo::Addresses>::*)(RouterInfo::Addresses *)>
 						(&i2p::util::MemoryPoolMt<RouterInfo::Addresses>::ReleaseMt,
-						&m_RouterInfoAddressVectorsPool, std::placeholders::_1));
+						&m_RouterInfoAddressVectorsPool, std::placeholders::_1)};
 			};
 			std::shared_ptr<Lease> NewLease (const Lease& lease) { return m_LeasesPool.AcquireSharedMt (lease); };
 			std::shared_ptr<IdentityEx> NewIdentity (const uint8_t * buf, size_t len) { return m_IdentitiesPool.AcquireSharedMt (buf, len); };
 			std::shared_ptr<RouterProfile> NewRouterProfile () { return m_RouterProfilesPool.AcquireSharedMt (); };
 
-			uint32_t GetPublishReplyToken () const { return m_PublishReplyToken; };
-
 		private:
 
 			void Load ();
@@ -148,9 +148,8 @@ namespace data
 			void SaveUpdated ();
 			void PersistRouters (std::list<std::pair<std::string, std::shared_ptr<RouterInfo::Buffer> > >&& update, 
 				std::list<std::string>&& remove);
-			void Run (); // exploratory thread
-			void Explore (int numDestinations);
-			void Flood (const IdentHash& ident, std::shared_ptr<I2NPMessage> floodMsg);
+			void Run (); 
+			void Flood (const IdentHash& ident, std::shared_ptr<I2NPMessage> floodMsg, bool andNextDay = false);
 			void ManageRouterInfos ();
 			void ManageLeaseSets ();
 			void ManageRequests ();
@@ -163,6 +162,10 @@ namespace data
 			template<typename Filter>
 			std::shared_ptr<const RouterInfo> GetRandomRouter (Filter filter) const;
 
+			void HandleDatabaseStoreMsg (std::shared_ptr<const I2NPMessage> msg);
+			void HandleDatabaseLookupMsg (std::shared_ptr<const I2NPMessage> msg);
+			void HandleNTCP2RouterInfoMsg (std::shared_ptr<const I2NPMessage> m);
+
 		private:
 
 			mutable std::mutex m_LeaseSetsMutex;
@@ -184,16 +187,11 @@ namespace data
 			std::shared_ptr<NetDbRequests> m_Requests;
 
 			bool m_PersistProfiles;
-			std::future<void> m_SavingProfiles, m_DeletingProfiles, m_PersistingRouters;
-
-			/** router info we are bootstrapping from or nullptr if we are not currently doing that*/
-			std::shared_ptr<RouterInfo> m_FloodfillBootstrap;
-
-			std::set<IdentHash> m_PublishExcluded;
-			uint32_t m_PublishReplyToken = 0;
+			std::future<void> m_SavingProfiles, m_DeletingProfiles, m_ApplyingProfileUpdates, m_PersistingRouters;
 
 			std::vector<std::shared_ptr<const RouterInfo> > m_ExploratorySelection;
 			uint64_t m_LastExploratorySelectionUpdateTime; // in monotonic seconds
+			std::mt19937 m_Rng;
 
 			i2p::util::MemoryPoolMt<RouterInfo::Buffer> m_RouterInfoBuffersPool;
 			i2p::util::MemoryPoolMt<RouterInfo::Address> m_RouterInfoAddressesPool;

libi2pd/NetDbRequests.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -10,28 +10,33 @@
 #include "I2NPProtocol.h"
 #include "Transports.h"
 #include "NetDb.hpp"
-#include "NetDbRequests.h"
 #include "ECIESX25519AEADRatchetSession.h"
+#include "RouterContext.h"
+#include "Timestamp.h"
+#include "NetDbRequests.h"
 
 namespace i2p
 {
 namespace data
 {
 	RequestedDestination::RequestedDestination (const IdentHash& destination, bool isExploratory, bool direct):
-		m_Destination (destination), m_IsExploratory (isExploratory), m_IsDirect (direct), m_IsActive (true),
-		m_CreationTime (i2p::util::GetSecondsSinceEpoch ()), m_LastRequestTime (0) 
+		m_Destination (destination), m_IsExploratory (isExploratory), m_IsDirect (direct), 
+		m_IsActive (true), m_IsSentDirectly (false),
+		m_CreationTime (i2p::util::GetMillisecondsSinceEpoch ()), 
+		m_LastRequestTime (0), m_NumAttempts (0)
 	{
+		if (i2p::context.IsFloodfill ())
+			m_ExcludedPeers.insert (i2p::context.GetIdentHash ()); // exclude self if floodfill
 	}
 		
 	RequestedDestination::~RequestedDestination () 
 	{ 
-		if (m_RequestComplete) m_RequestComplete (nullptr); 
+		InvokeRequestComplete (nullptr);
 	}
 		
 	std::shared_ptr<I2NPMessage> RequestedDestination::CreateRequestMessage (std::shared_ptr<const RouterInfo> router,
 		std::shared_ptr<const i2p::tunnel::InboundTunnel> replyTunnel)
 	{
-		std::lock_guard<std::mutex> l (m_ExcludedPeersMutex);
 		std::shared_ptr<I2NPMessage> msg;
 		if(replyTunnel)
 			msg = i2p::CreateRouterInfoDatabaseLookupMsg (m_Destination,
@@ -41,54 +46,49 @@ namespace data
 			msg = i2p::CreateRouterInfoDatabaseLookupMsg(m_Destination, i2p::context.GetIdentHash(), 0, m_IsExploratory, &m_ExcludedPeers);
 		if(router)
 			m_ExcludedPeers.insert (router->GetIdentHash ());
-		m_LastRequestTime = i2p::util::GetSecondsSinceEpoch ();
+		m_LastRequestTime = i2p::util::GetMillisecondsSinceEpoch ();
+		m_NumAttempts++;
+		m_IsSentDirectly = false;
 		return msg;
 	}
 
 	std::shared_ptr<I2NPMessage> RequestedDestination::CreateRequestMessage (const IdentHash& floodfill)
 	{
-		std::lock_guard<std::mutex> l (m_ExcludedPeersMutex);
 		auto msg = i2p::CreateRouterInfoDatabaseLookupMsg (m_Destination,
 			i2p::context.GetRouterInfo ().GetIdentHash () , 0, false, &m_ExcludedPeers);
 		m_ExcludedPeers.insert (floodfill);
-		m_LastRequestTime = i2p::util::GetSecondsSinceEpoch ();
+		m_NumAttempts++;
+		m_LastRequestTime = i2p::util::GetMillisecondsSinceEpoch ();
+		m_IsSentDirectly = true;
 		return msg;
 	}
 
 	bool RequestedDestination::IsExcluded (const IdentHash& ident) const 
 	{ 
-		std::lock_guard<std::mutex> l (m_ExcludedPeersMutex);
 		return m_ExcludedPeers.count (ident); 
 	}
 		
 	void RequestedDestination::ClearExcludedPeers ()
 	{
-		std::lock_guard<std::mutex> l (m_ExcludedPeersMutex);
 		m_ExcludedPeers.clear ();
 	}
 
-	std::set<IdentHash> RequestedDestination::GetExcludedPeers () const 
-	{ 
-		std::lock_guard<std::mutex> l (m_ExcludedPeersMutex);
-		return m_ExcludedPeers; 
-	}
-
-	size_t RequestedDestination::GetNumExcludedPeers () const 
-	{ 
-		std::lock_guard<std::mutex> l (m_ExcludedPeersMutex);
-		return m_ExcludedPeers.size (); 
-	}
+	void RequestedDestination::InvokeRequestComplete (std::shared_ptr<RouterInfo> r)
+	{
+		if (!m_RequestComplete.empty ())
+		{	
+			for (auto it: m_RequestComplete)
+				if (it != nullptr) it (r);
+			m_RequestComplete.clear ();
+		}	
+	}	
 		
 	void RequestedDestination::Success (std::shared_ptr<RouterInfo> r)
 	{
 		if (m_IsActive)
 		{	
 			m_IsActive = false;
-			if (m_RequestComplete)
-			{
-				m_RequestComplete (r);
-				m_RequestComplete = nullptr;
-			}
+			InvokeRequestComplete (r);
 		}	
 	}
 
@@ -97,84 +97,115 @@ namespace data
 		if (m_IsActive)
 		{	
 			m_IsActive = false;
-			if (m_RequestComplete)
-			{
-				m_RequestComplete (nullptr);
-				m_RequestComplete = nullptr;
-			}
+			InvokeRequestComplete (nullptr);
 		}	
 	}
 
+	NetDbRequests::NetDbRequests ():
+		RunnableServiceWithWork ("NetDbReq"),
+		m_ManageRequestsTimer (GetIOService ()), m_ExploratoryTimer (GetIOService ()),
+		m_CleanupTimer (GetIOService ()), m_DiscoveredRoutersTimer (GetIOService ()),
+		m_Rng(i2p::util::GetMonotonicMicroseconds () % 1000000LL) 
+	{
+	}
+		
+	NetDbRequests::~NetDbRequests ()
+	{
+		Stop ();
+	}	
+		
 	void NetDbRequests::Start ()
 	{
-		m_LastPoolCleanUpTime = i2p::util::GetSecondsSinceEpoch ();
+		if (!IsRunning ())
+		{	
+			StartIOService ();
+			ScheduleManageRequests ();
+			ScheduleCleanup ();
+			if (!i2p::context.IsHidden ())
+				ScheduleExploratory (EXPLORATORY_REQUEST_INTERVAL);
+		}	
 	}
 
 	void NetDbRequests::Stop ()
 	{
-		m_RequestedDestinations.clear ();
-		m_RequestedDestinationsPool.CleanUpMt ();
+		if (IsRunning ())
+		{	
+			m_ManageRequestsTimer.cancel ();
+			m_ExploratoryTimer.cancel ();
+			m_CleanupTimer.cancel ();
+			StopIOService ();
+		
+			m_RequestedDestinations.clear ();
+			m_RequestedDestinationsPool.CleanUpMt ();
+		}	
 	}
 
-
+	void NetDbRequests::ScheduleCleanup ()
+	{
+		m_CleanupTimer.expires_from_now (boost::posix_time::seconds(REQUESTED_DESTINATIONS_POOL_CLEANUP_INTERVAL));
+		m_CleanupTimer.async_wait (std::bind (&NetDbRequests::HandleCleanupTimer,
+			this, std::placeholders::_1));
+	}	
+		
+	void NetDbRequests::HandleCleanupTimer (const boost::system::error_code& ecode)
+	{		
+		if (ecode != boost::asio::error::operation_aborted)
+		{
+			m_RequestedDestinationsPool.CleanUpMt ();
+			ScheduleCleanup ();
+		}	
+	}
+		
 	std::shared_ptr<RequestedDestination> NetDbRequests::CreateRequest (const IdentHash& destination, 
 		bool isExploratory, bool direct, RequestedDestination::RequestComplete requestComplete)
 	{
 		// request RouterInfo directly
 		auto dest = m_RequestedDestinationsPool.AcquireSharedMt (destination, isExploratory, direct);
-		dest->SetRequestComplete (requestComplete);
-		{
-			std::unique_lock<std::mutex> l(m_RequestedDestinationsMutex); 
-			auto ret = m_RequestedDestinations.emplace (destination, dest);
-			if (!ret.second) // not inserted
+		if (requestComplete)
+			dest->AddRequestComplete (requestComplete);
+		
+		auto ret = m_RequestedDestinations.emplace (destination, dest);
+		if (!ret.second) // not inserted
+		{	
+			dest->ResetRequestComplete (); // don't call requestComplete in destructor	
+			dest = ret.first->second; // existing one
+			if (requestComplete)
 			{	
-				dest->SetRequestComplete (nullptr); // don't call requestComplete in destructor	
-				dest = ret.first->second; // existing one
-				if (requestComplete && dest->IsActive ())
-				{	
-					auto prev = dest->GetRequestComplete ();  
-					if (prev) // if already set 	
-						dest->SetRequestComplete (
-							[requestComplete, prev](std::shared_ptr<RouterInfo> r)
-							{
-								prev (r); // call previous
-								requestComplete (r); // then new
-							});
-					else
-						dest->SetRequestComplete (requestComplete);
-				}
-				return nullptr;
+				if (dest->IsActive ())
+					dest->AddRequestComplete (requestComplete);
+				else
+					requestComplete (nullptr);
 			}	
-		}
+			return nullptr;
+		}	
 		return dest;
 	}
 
 	void NetDbRequests::RequestComplete (const IdentHash& ident, std::shared_ptr<RouterInfo> r)
 	{
-		std::shared_ptr<RequestedDestination> request;
-		{
-			std::unique_lock<std::mutex> l(m_RequestedDestinationsMutex);
-			auto it = m_RequestedDestinations.find (ident);
-			if (it != m_RequestedDestinations.end ())
-			{
-				request = it->second;
-				if (request->IsExploratory ())
-					m_RequestedDestinations.erase (it);
-				// otherwise cache for a while
-			}
-		}
-		if (request)
-		{
-			if (r)
-				request->Success (r);
-			else
-				request->Fail ();
-		}
+		boost::asio::post (GetIOService (), [this, ident, r]()
+			{                      
+				std::shared_ptr<RequestedDestination> request;
+				auto it = m_RequestedDestinations.find (ident);
+				if (it != m_RequestedDestinations.end ())
+				{
+					request = it->second;
+					if (request->IsExploratory ())
+						m_RequestedDestinations.erase (it);
+					// otherwise cache for a while
+				}
+				if (request)
+				{
+					if (r)
+						request->Success (r);
+					else
+						request->Fail ();
+				}
+			});
 	}
 
 	std::shared_ptr<RequestedDestination> NetDbRequests::FindRequest (const IdentHash& ident) const
 	{
-		std::unique_lock<std::mutex> l(m_RequestedDestinationsMutex);
 		auto it = m_RequestedDestinations.find (ident);
 		if (it != m_RequestedDestinations.end ())
 			return it->second;
@@ -183,13 +214,7 @@ namespace data
 
 	void NetDbRequests::ManageRequests ()
 	{
-		uint64_t ts = i2p::util::GetSecondsSinceEpoch ();
-		if (ts > m_LastPoolCleanUpTime + REQUESTED_DESTINATIONS_POOL_CLEANUP_INTERVAL)
-		{
-			m_RequestedDestinationsPool.CleanUpMt ();
-			m_LastPoolCleanUpTime = ts;
-		}	
-		std::unique_lock<std::mutex> l(m_RequestedDestinationsMutex);
+		uint64_t ts = i2p::util::GetMillisecondsSinceEpoch ();
 		for (auto it = m_RequestedDestinations.begin (); it != m_RequestedDestinations.end ();)
 		{
 			auto& dest = it->second;
@@ -201,7 +226,8 @@ namespace data
 					bool done = false;
 					if (ts < dest->GetCreationTime () + MAX_REQUEST_TIME)
 					{
-						if (ts > dest->GetLastRequestTime () + MIN_REQUEST_TIME) // try next floodfill if no response after min interval
+						if (ts > dest->GetLastRequestTime () + (dest->IsSentDirectly () ? MIN_DIRECT_REQUEST_TIME : MIN_REQUEST_TIME)) 
+						// try next floodfill if no response after min interval
 							done = !SendNextRequest (dest);
 					}
 					else // request is expired
@@ -231,7 +257,7 @@ namespace data
 	{
 		if (!dest || !dest->IsActive ()) return false;
 		bool ret = true;
-		auto count = dest->GetNumExcludedPeers ();
+		auto count = dest->GetNumAttempts ();
 		if (!dest->IsExploratory () && count < MAX_NUM_REQUEST_ATTEMPTS)
 		{
 			auto nextFloodfill = netdb.GetClosestFloodfill (dest->GetDestination (), dest->GetExcludedPeers ());
@@ -241,13 +267,23 @@ namespace data
 				if (direct && !nextFloodfill->IsReachableFrom (i2p::context.GetRouterInfo ()) &&
 					!i2p::transport::transports.IsConnected (nextFloodfill->GetIdentHash ()))
 					direct = false; // floodfill can't be reached directly
+				auto s = shared_from_this ();
+				auto onDrop = [s, dest]()
+					{
+						if (dest->IsActive ())
+						{
+							boost::asio::post (s->GetIOService (), [s, dest]()
+								{
+									if (dest->IsActive ()) s->SendNextRequest (dest);
+								});
+						}	
+					};		
 				if (direct)
 				{
 					if (CheckLogLevel (eLogDebug))
 						LogPrint (eLogDebug, "NetDbReq: Try ", dest->GetDestination ().ToBase64 (), " at ", count, " floodfill ", nextFloodfill->GetIdentHash ().ToBase64 (), " directly");
 					auto msg = dest->CreateRequestMessage (nextFloodfill->GetIdentHash ());
-					auto s = shared_from_this ();
-					msg->onDrop = [s, dest]() { if (dest->IsActive ()) s->SendNextRequest (dest); }; 
+					msg->onDrop = onDrop; 
 					i2p::transport::transports.SendMessage (nextFloodfill->GetIdentHash (), msg);
 				}	
 				else
@@ -262,8 +298,7 @@ namespace data
 							if (CheckLogLevel (eLogDebug))
 								LogPrint (eLogDebug, "NetDbReq: Try ", dest->GetDestination ().ToBase64 (), " at ", count, " floodfill ", nextFloodfill->GetIdentHash ().ToBase64 (), " through tunnels");
 							auto msg = dest->CreateRequestMessage (nextFloodfill, inbound); 
-							auto s = shared_from_this ();
-							msg->onDrop = [s, dest]() { if (dest->IsActive ()) s->SendNextRequest (dest); };
+							msg->onDrop = onDrop;
 							outbound->SendTunnelDataMsgTo (nextFloodfill->GetIdentHash (), 0,
 								i2p::garlic::WrapECIESX25519MessageForRouter (msg, nextFloodfill->GetIdentity ()->GetEncryptionPublicKey ()));
 						}	
@@ -284,16 +319,243 @@ namespace data
 			else
 			{
 				ret = false;
-				if (!nextFloodfill) LogPrint (eLogWarning, "NetDbReq: No more floodfills");
+				LogPrint (eLogWarning, "NetDbReq: No more floodfills for ", dest->GetDestination ().ToBase64 (), " after ", count, "attempts");
 			}	
 		}
 		else
 		{
 			if (!dest->IsExploratory ())
-				LogPrint (eLogWarning, "NetDbReq: ", dest->GetDestination ().ToBase64 (), " not found after 7 attempts");
+				LogPrint (eLogWarning, "NetDbReq: ", dest->GetDestination ().ToBase64 (), " not found after ", MAX_NUM_REQUEST_ATTEMPTS," attempts");
 			ret = false;
 		}
 		return ret;
 	}	
+
+	void NetDbRequests::ScheduleManageRequests ()
+	{
+		m_ManageRequestsTimer.expires_from_now (boost::posix_time::milliseconds(MANAGE_REQUESTS_INTERVAL +
+			m_Rng () % MANAGE_REQUESTS_INTERVAL_VARIANCE));
+		m_ManageRequestsTimer.async_wait (std::bind (&NetDbRequests::HandleManageRequestsTimer,
+			this, std::placeholders::_1));
+	}
+		
+	void NetDbRequests::HandleManageRequestsTimer (const boost::system::error_code& ecode)
+	{
+		if (ecode != boost::asio::error::operation_aborted)
+		{
+			if (i2p::tunnel::tunnels.GetExploratoryPool ()) // expolratory pool is ready?
+				ManageRequests ();
+			ScheduleManageRequests ();
+		}	
+	}	
+
+	void NetDbRequests::PostDatabaseSearchReplyMsg (std::shared_ptr<const I2NPMessage> msg)
+	{
+		boost::asio::post (GetIOService (), [this, msg]()
+			{
+				HandleDatabaseSearchReplyMsg (msg);
+			});	
+	}	
+
+	void NetDbRequests::HandleDatabaseSearchReplyMsg (std::shared_ptr<const I2NPMessage> msg)
+	{
+		const uint8_t * buf = msg->GetPayload ();
+		char key[48];
+		int l = i2p::data::ByteStreamToBase64 (buf, 32, key, 48);
+		key[l] = 0;
+		size_t num = buf[32]; // num
+		LogPrint (eLogDebug, "NetDbReq: DatabaseSearchReply for ", key, " num=", num);
+		IdentHash ident (buf);
+		bool isExploratory = false;
+		auto dest = FindRequest (ident);
+		if (dest && dest->IsActive ())
+		{
+			isExploratory = dest->IsExploratory ();
+			if (!isExploratory && (num > 0 || dest->GetNumAttempts () < 3)) // before 3-rd attempt might be just bad luck
+			{	
+				// try to send next requests
+				if (!SendNextRequest (dest))
+					RequestComplete (ident, nullptr);
+			}	
+			else
+				// no more requests for destination possible. delete it
+				RequestComplete (ident, nullptr);
+		}
+		else /*if (!m_FloodfillBootstrap)*/
+		{	
+			LogPrint (eLogInfo, "NetDbReq: Unsolicited or late database search reply for ", key);
+			return;
+		}	
+
+		// try responses
+		if (num > NETDB_MAX_NUM_SEARCH_REPLY_PEER_HASHES)
+		{
+			LogPrint (eLogWarning, "NetDbReq: Too many peer hashes ", num, " in database search reply, Reduced to ", NETDB_MAX_NUM_SEARCH_REPLY_PEER_HASHES);
+			num = NETDB_MAX_NUM_SEARCH_REPLY_PEER_HASHES;
+		}	
+		if (isExploratory && !m_DiscoveredRouterHashes.empty ())
+		{
+			// request outstanding routers
+			for (auto it: m_DiscoveredRouterHashes)
+				RequestRouter (it);
+			m_DiscoveredRouterHashes.clear ();
+			m_DiscoveredRoutersTimer.cancel ();
+		}	
+		for (size_t i = 0; i < num; i++)
+		{
+			IdentHash router (buf + 33 + i*32);
+			if (CheckLogLevel (eLogDebug))
+				LogPrint (eLogDebug, "NetDbReq: ", i, ": ", router.ToBase64 ());
+
+			if (isExploratory)
+				// postpone request
+				m_DiscoveredRouterHashes.push_back (router);
+			else	
+				// send request right a way
+				RequestRouter (router);
+		}
+		if (isExploratory && !m_DiscoveredRouterHashes.empty ())
+			ScheduleDiscoveredRoutersRequest (); 	
+	}	
+
+	void NetDbRequests::RequestRouter (const IdentHash& router)
+	{		
+		auto r = netdb.FindRouter (router);
+		if (!r || i2p::util::GetMillisecondsSinceEpoch () > r->GetTimestamp () + 3600*1000LL)
+		{
+			// router with ident not found or too old (1 hour)
+			LogPrint (eLogDebug, "NetDbReq: Found new/outdated router. Requesting RouterInfo...");
+			if (!IsRouterBanned (router))
+				RequestDestination (router, nullptr, true);
+			else
+				LogPrint (eLogDebug, "NetDbReq: Router ", router.ToBase64 (), " is banned. Skipped");
+		}
+		else
+			LogPrint (eLogDebug, "NetDbReq: [:|||:]");
+	}	
+		
+	void NetDbRequests::PostRequestDestination (const IdentHash& destination, 
+		const RequestedDestination::RequestComplete& requestComplete, bool direct)
+	{
+		boost::asio::post (GetIOService (), [this, destination, requestComplete, direct]()
+			{
+				RequestDestination (destination, requestComplete, direct);
+			});	
+	}
+		
+	void NetDbRequests::RequestDestination (const IdentHash& destination, const RequestedDestination::RequestComplete& requestComplete, bool direct)
+	{
+		auto dest = CreateRequest (destination, false, direct, requestComplete); // non-exploratory
+		if (dest)
+		{	
+			if (!SendNextRequest (dest))
+				RequestComplete (destination, nullptr);
+		}	
+		else
+			LogPrint (eLogWarning, "NetDbReq: Destination ", destination.ToBase64(), " is requested already or cached");
+	}	
+
+	void NetDbRequests::Explore (int numDestinations)
+	{
+		// new requests
+		auto exploratoryPool = i2p::tunnel::tunnels.GetExploratoryPool ();
+		auto outbound = exploratoryPool ? exploratoryPool->GetNextOutboundTunnel () : nullptr;
+		auto inbound = exploratoryPool ? exploratoryPool->GetNextInboundTunnel () : nullptr;
+		bool throughTunnels = outbound && inbound;
+
+		uint8_t randomHash[32];
+		std::vector<i2p::tunnel::TunnelMessageBlock> msgs;
+		LogPrint (eLogInfo, "NetDbReq: Exploring new ", numDestinations, " routers ...");
+		for (int i = 0; i < numDestinations; i++)
+		{
+			RAND_bytes (randomHash, 32);
+			auto dest = CreateRequest (randomHash, true, !throughTunnels); // exploratory
+			if (!dest)
+			{
+				LogPrint (eLogWarning, "NetDbReq: Exploratory destination is requested already");
+				return;
+			}
+			auto floodfill = netdb.GetClosestFloodfill (randomHash, dest->GetExcludedPeers ());
+			if (floodfill)
+			{
+				if (i2p::transport::transports.IsConnected (floodfill->GetIdentHash ()))
+					throughTunnels = false;
+				if (throughTunnels)
+				{
+					msgs.push_back (i2p::tunnel::TunnelMessageBlock
+						{
+							i2p::tunnel::eDeliveryTypeRouter,
+							floodfill->GetIdentHash (), 0,
+							CreateDatabaseStoreMsg () // tell floodfill about us
+						});
+					msgs.push_back (i2p::tunnel::TunnelMessageBlock
+						{
+							i2p::tunnel::eDeliveryTypeRouter,
+							floodfill->GetIdentHash (), 0,
+							dest->CreateRequestMessage (floodfill, inbound) // explore
+						});
+				}
+				else
+					i2p::transport::transports.SendMessage (floodfill->GetIdentHash (), dest->CreateRequestMessage (floodfill->GetIdentHash ()));
+			}
+			else
+				RequestComplete (randomHash, nullptr);
+		}
+		if (throughTunnels && msgs.size () > 0)
+			outbound->SendTunnelDataMsgs (msgs);
+	}	
+
+	void NetDbRequests::ScheduleExploratory (uint64_t interval)
+	{
+		m_ExploratoryTimer.expires_from_now (boost::posix_time::seconds(interval));
+		m_ExploratoryTimer.async_wait (std::bind (&NetDbRequests::HandleExploratoryTimer,
+			this, std::placeholders::_1));
+	}
+		
+	void NetDbRequests::HandleExploratoryTimer (const boost::system::error_code& ecode)
+	{
+		if (ecode != boost::asio::error::operation_aborted)
+		{
+			auto numRouters = netdb.GetNumRouters ();
+			auto nextExploratoryInterval = numRouters < 2500 ? (EXPLORATORY_REQUEST_INTERVAL + m_Rng () % EXPLORATORY_REQUEST_INTERVAL)/2 :
+				EXPLORATORY_REQUEST_INTERVAL + m_Rng () % EXPLORATORY_REQUEST_INTERVAL_VARIANCE;
+			if (numRouters)
+			{	
+				if (i2p::transport::transports.IsOnline () && i2p::transport::transports.IsRunning ()) 
+				{	
+					// explore only if online
+					numRouters = 800/numRouters;
+					if (numRouters < 1) numRouters = 1;
+					if (numRouters > 9) numRouters = 9;
+					Explore (numRouters);
+				}	
+			}	
+			else
+				LogPrint (eLogError, "NetDbReq: No known routers, reseed seems to be totally failed");
+			ScheduleExploratory (nextExploratoryInterval);
+		}	
+	}	
+
+	void NetDbRequests::ScheduleDiscoveredRoutersRequest ()
+	{
+		m_DiscoveredRoutersTimer.expires_from_now (boost::posix_time::milliseconds(
+			DISCOVERED_REQUEST_INTERVAL + m_Rng () % DISCOVERED_REQUEST_INTERVAL_VARIANCE));
+		m_DiscoveredRoutersTimer.async_wait (std::bind (&NetDbRequests::HandleDiscoveredRoutersTimer,
+			this, std::placeholders::_1));
+	}	
+
+	void NetDbRequests::HandleDiscoveredRoutersTimer (const boost::system::error_code& ecode)
+	{
+		if (ecode != boost::asio::error::operation_aborted)
+		{
+			if (!m_DiscoveredRouterHashes.empty ())
+			{
+				RequestRouter (m_DiscoveredRouterHashes.front ());
+				m_DiscoveredRouterHashes.pop_front ();
+				if (!m_DiscoveredRouterHashes.empty ()) // more hashes to request
+					ScheduleDiscoveredRoutersRequest ();
+			}	
+		}	
+	}	
 }
 }

libi2pd/NetDbRequests.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -11,8 +11,10 @@
 
 #include <inttypes.h>
 #include <memory>
-#include <set>
+#include <random>
+#include <unordered_set>
 #include <unordered_map>
+#include <list>
 #include "Identity.h"
 #include "RouterInfo.h"
 #include "util.h"
@@ -21,12 +23,18 @@ namespace i2p
 {
 namespace data
 {
-	const size_t MAX_NUM_REQUEST_ATTEMPTS = 5;
-	const uint64_t MANAGE_REQUESTS_INTERVAL = 1; // in seconds
-	const uint64_t MIN_REQUEST_TIME = 5; // in seconds
-	const uint64_t MAX_REQUEST_TIME = MAX_NUM_REQUEST_ATTEMPTS * (MIN_REQUEST_TIME + MANAGE_REQUESTS_INTERVAL);
-	const uint64_t MAX_EXPLORATORY_REQUEST_TIME = 30; // in seconds
-	const uint64_t REQUEST_CACHE_TIME = MAX_REQUEST_TIME + 40; // in seconds
+	const int MAX_NUM_REQUEST_ATTEMPTS = 5;
+	const uint64_t MANAGE_REQUESTS_INTERVAL = 400; // in milliseconds
+	const uint64_t MANAGE_REQUESTS_INTERVAL_VARIANCE = 300; // in milliseconds
+	const uint64_t MIN_REQUEST_TIME = 1200; // in milliseconds
+	const uint64_t MAX_REQUEST_TIME = MAX_NUM_REQUEST_ATTEMPTS * (MIN_REQUEST_TIME + MANAGE_REQUESTS_INTERVAL + MANAGE_REQUESTS_INTERVAL_VARIANCE);
+	const uint64_t MIN_DIRECT_REQUEST_TIME = 600; // in milliseconds
+	const uint64_t EXPLORATORY_REQUEST_INTERVAL = 55; // in seconds
+	const uint64_t EXPLORATORY_REQUEST_INTERVAL_VARIANCE = 170; // in seconds 
+	const uint64_t DISCOVERED_REQUEST_INTERVAL = 360; // in milliseconds
+	const uint64_t DISCOVERED_REQUEST_INTERVAL_VARIANCE = 540; // in milliseconds
+	const uint64_t MAX_EXPLORATORY_REQUEST_TIME = 30000; // in milliseconds
+	const uint64_t REQUEST_CACHE_TIME = MAX_REQUEST_TIME + 40000; // in milliseconds
 	const uint64_t REQUESTED_DESTINATIONS_POOL_CLEANUP_INTERVAL = 191; // in seconds
 	
 	class RequestedDestination
@@ -39,54 +47,83 @@ namespace data
 			~RequestedDestination ();
 
 			const IdentHash& GetDestination () const { return m_Destination; };
-			size_t GetNumExcludedPeers () const;
-			std::set<IdentHash> GetExcludedPeers () const;
+			const std::unordered_set<IdentHash>& GetExcludedPeers () const { return m_ExcludedPeers; };
+			int GetNumAttempts () const { return m_NumAttempts; };
 			void ClearExcludedPeers ();
 			bool IsExploratory () const { return m_IsExploratory; };
 			bool IsDirect () const { return m_IsDirect; };
 			bool IsActive () const { return m_IsActive; };
+			bool IsSentDirectly () const { return m_IsSentDirectly; };
 			bool IsExcluded (const IdentHash& ident) const;
 			uint64_t GetCreationTime () const { return m_CreationTime; };
 			uint64_t GetLastRequestTime () const { return m_LastRequestTime; };
 			std::shared_ptr<I2NPMessage> CreateRequestMessage (std::shared_ptr<const RouterInfo>, std::shared_ptr<const i2p::tunnel::InboundTunnel> replyTunnel);
 			std::shared_ptr<I2NPMessage> CreateRequestMessage (const IdentHash& floodfill);
 
-			void SetRequestComplete (const RequestComplete& requestComplete) { m_RequestComplete = requestComplete; };
-			RequestComplete GetRequestComplete () const { return m_RequestComplete; };
-			bool IsRequestComplete () const { return m_RequestComplete != nullptr; };
+			void AddRequestComplete (const RequestComplete& requestComplete) { m_RequestComplete.push_back (requestComplete); };
+			void ResetRequestComplete () { m_RequestComplete.clear (); };
 			void Success (std::shared_ptr<RouterInfo> r);
 			void Fail ();
 
 		private:
 
-			IdentHash m_Destination;
-			bool m_IsExploratory, m_IsDirect, m_IsActive;
-			mutable std::mutex m_ExcludedPeersMutex;
-			std::set<IdentHash> m_ExcludedPeers;
-			uint64_t m_CreationTime, m_LastRequestTime; // in seconds
-			RequestComplete m_RequestComplete;
-	};
-
-	class NetDbRequests: public std::enable_shared_from_this<NetDbRequests>
-	{
-		public:
-
-			void Start ();
-			void Stop ();
-
-			std::shared_ptr<RequestedDestination> CreateRequest (const IdentHash& destination, bool isExploratory, 
-				bool direct = false, RequestedDestination::RequestComplete requestComplete = nullptr);
-			void RequestComplete (const IdentHash& ident, std::shared_ptr<RouterInfo> r);
-			std::shared_ptr<RequestedDestination> FindRequest (const IdentHash& ident) const;
-			void ManageRequests ();
-			bool SendNextRequest (std::shared_ptr<RequestedDestination> dest);
+			void InvokeRequestComplete (std::shared_ptr<RouterInfo> r);
+			
+		private:
+
+			IdentHash m_Destination;
+			bool m_IsExploratory, m_IsDirect, m_IsActive, m_IsSentDirectly;
+			std::unordered_set<IdentHash> m_ExcludedPeers;
+			uint64_t m_CreationTime, m_LastRequestTime; // in milliseconds
+			std::list<RequestComplete> m_RequestComplete;
+			int m_NumAttempts;
+	};
+
+	class NetDbRequests: public std::enable_shared_from_this<NetDbRequests>,
+		 private i2p::util::RunnableServiceWithWork
+	{
+		public:
+
+			NetDbRequests ();
+			~NetDbRequests ();
+			
+			void Start ();
+			void Stop ();
+
+			void RequestComplete (const IdentHash& ident, std::shared_ptr<RouterInfo> r);
+			void PostDatabaseSearchReplyMsg (std::shared_ptr<const I2NPMessage> msg);
+			void PostRequestDestination (const IdentHash& destination, const RequestedDestination::RequestComplete& requestComplete, bool direct);
+			
+		private:	
+
+			std::shared_ptr<RequestedDestination> CreateRequest (const IdentHash& destination, bool isExploratory, 
+				bool direct = false, RequestedDestination::RequestComplete requestComplete = nullptr);
+			std::shared_ptr<RequestedDestination> FindRequest (const IdentHash& ident) const;
+			bool SendNextRequest (std::shared_ptr<RequestedDestination> dest);
+			
+			void HandleDatabaseSearchReplyMsg (std::shared_ptr<const I2NPMessage> msg);
+			void RequestRouter (const IdentHash& router);
+			void RequestDestination (const IdentHash& destination, const RequestedDestination::RequestComplete& requestComplete, bool direct);
+			void Explore (int numDestinations);
+			void ManageRequests ();
+			// timer
+			void ScheduleManageRequests ();
+			void HandleManageRequestsTimer (const boost::system::error_code& ecode);
+			void ScheduleExploratory (uint64_t interval);
+			void HandleExploratoryTimer (const boost::system::error_code& ecode);
+			void ScheduleCleanup ();
+			void HandleCleanupTimer (const boost::system::error_code& ecode);
+			void ScheduleDiscoveredRoutersRequest ();
+			void HandleDiscoveredRoutersTimer (const boost::system::error_code& ecode);
 			
 		private:
 
-			mutable std::mutex m_RequestedDestinationsMutex;
-			std::unordered_map<IdentHash, std::shared_ptr<RequestedDestination> > m_RequestedDestinations;
 			i2p::util::MemoryPoolMt<RequestedDestination> m_RequestedDestinationsPool;
-			uint64_t m_LastPoolCleanUpTime = 0; // in seconds
+			std::unordered_map<IdentHash, std::shared_ptr<RequestedDestination> > m_RequestedDestinations;
+			std::list<IdentHash> m_DiscoveredRouterHashes;
+			boost::asio::deadline_timer m_ManageRequestsTimer, m_ExploratoryTimer,
+				m_CleanupTimer, m_DiscoveredRoutersTimer;
+			std::mt19937 m_Rng;
 	};
 }
 }

libi2pd/Poly1305.cpp

@@ -1,25 +0,0 @@
-/**
- * This code is licensed under the MCGSI Public License
- * Copyright 2018 Jeff Becker
- *
- *Kovri go write your own code
- *
- */
-
-#include "Poly1305.h"
-
-#if !OPENSSL_AEAD_CHACHA20_POLY1305
-namespace i2p
-{
-namespace crypto
-{
-	void Poly1305HMAC(uint64_t * out, const uint64_t * key, const uint8_t * buf, std::size_t sz)
-	{
-		Poly1305 p(key);
-		p.Update(buf, sz);
-		p.Finish(out);
-	}
-}
-}
-#endif
-

libi2pd/Poly1305.h

@@ -1,261 +0,0 @@
-/**
- * This code is licensed under the MCGSI Public License
- * Copyright 2018 Jeff Becker
- *
- * Kovri go write your own code
- *
- */
-
-#ifndef LIBI2PD_POLY1305_H
-#define LIBI2PD_POLY1305_H
-#include <cstdint>
-#include <cstring>
-#include "Crypto.h"
-
-#if !OPENSSL_AEAD_CHACHA20_POLY1305
-namespace i2p
-{
-namespace crypto
-{
-	const std::size_t POLY1305_DIGEST_BYTES = 16;
-	const std::size_t POLY1305_DIGEST_DWORDS = 4;
-	const std::size_t POLY1305_KEY_BYTES = 32;
-	const std::size_t POLY1305_KEY_DWORDS = 8;
-	const std::size_t POLY1305_BLOCK_BYTES = 16;
-
-	namespace poly1305
-	{
-		struct LongBlock
-		{
-			unsigned long data[17];
-			operator unsigned long * ()
-			{
-				return data;
-			}
-		};
-
-		struct Block
-		{
-			unsigned char data[17];
-
-			void Zero()
-			{
-				memset(data, 0, sizeof(data));
-			}
-
-			operator uint8_t * ()
-			{
-				return data;
-			}
-
-			Block & operator += (const Block & other)
-			{
-				unsigned short u;
-				unsigned int i;
-				for(u = 0, i = 0; i < 17; i++)
-				{
-					u += (unsigned short) data[i] + (unsigned short) other.data[i];
-					data[i] = (unsigned char) u & 0xff;
-					u >>= 8;
-				}
-				return *this;
-			}
-
-			Block & operator %=(const LongBlock & other)
-			{
-				unsigned long u;
-				unsigned int i;
-				u = 0;
-				for (i = 0; i < 16; i++) {
-					u += other.data[i];
-					data[i] = (unsigned char)u & 0xff;
-					u >>= 8;
-				}
-				u += other.data[16];
-				data[16] = (unsigned char)u & 0x03;
-				u >>= 2;
-				u += (u << 2);
-				for (i = 0; i < 16; i++) {
-					u += data[i];
-					data[i] = (unsigned char)u & 0xff;
-					u >>= 8;
-				}
-				data[16] += (unsigned char)u;
-				return *this;
-			}
-
-			Block & operator = (const Block & other)
-			{
-				memcpy(data, other.data, sizeof(data));
-				return *this;
-			}
-
-			Block & operator ~ ()
-			{
-				static const Block minusp = {
-					0x05,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
-					0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
-					0xfc
-				};
-				Block orig;
-				unsigned char neg;
-				unsigned int i;
-				orig = *this;
-				*this += minusp;
-				neg = -(data[16] >> 7);
-				for(i = 0; i < 17; i++)
-					data[i] ^= neg & (orig.data[i] ^ data[i]);
-
-				return *this;
-			}
-
-			void PutKey(const uint64_t * key_l)
-			{
-				const uint8_t * key = (const uint8_t*) key_l;
-				data[0] = key[0] & 0xff;
-				data[1] = key[1] & 0xff;
-				data[2] = key[2] & 0xff;
-				data[3] = key[3] & 0x0f;
-				data[4] = key[4] & 0xfc;
-				data[5] = key[5] & 0xff;
-				data[6] = key[6] & 0xff;
-				data[7] = key[7] & 0x0f;
-				data[8] = key[8] & 0xfc;
-				data[9] = key[9] & 0xff;
-				data[10] = key[10] & 0xff;
-				data[11] = key[11] & 0x0f;
-				data[12] = key[12] & 0xfc;
-				data[13] = key[13] & 0xff;
-				data[14] = key[14] & 0xff;
-				data[15] = key[15] & 0x0f;
-				data[16] = 0;
-			}
-
-			template<typename Int_t>
-			void Put(const Int_t * d, uint8_t last=0)
-			{
-				memcpy(data, d, 16);
-				data[16] = last;
-			}
-		};
-
-		struct Buffer
-		{
-			uint8_t data[POLY1305_BLOCK_BYTES];
-
-			operator uint8_t * ()
-			{
-				return data;
-			}
-		};
-	}
-
-	struct Poly1305
-	{
-		Poly1305(const uint64_t * key)
-		{
-			m_Leftover = 0;
-			m_H.Zero();
-			m_Final = 0;
-			m_R.PutKey(key);
-			m_Pad.Put(key + 2);
-		}
-
-		void Update(const uint8_t * buf, size_t sz)
-		{
-			// process leftover
-			if(m_Leftover)
-			{
-				size_t want = POLY1305_BLOCK_BYTES - m_Leftover;
-				if(want > sz) want = sz;
-				memcpy(m_Buffer + m_Leftover, buf, want);
-				sz -= want;
-				buf += want;
-				m_Leftover += want;
-				if(m_Leftover < POLY1305_BLOCK_BYTES) return;
-				Blocks(m_Buffer, POLY1305_BLOCK_BYTES);
-				m_Leftover = 0;
-			}
-			// process blocks
-			if(sz >= POLY1305_BLOCK_BYTES)
-			{
-				size_t want = (sz & ~(POLY1305_BLOCK_BYTES - 1));
-				Blocks(buf, want);
-				buf += want;
-				sz -= want;
-			}
-			// leftover
-			if(sz)
-			{
-				memcpy(m_Buffer+m_Leftover, buf, sz);
-				m_Leftover += sz;
-			}
-		}
-
-		void Blocks(const uint8_t * buf, size_t sz)
-		{
-			const unsigned char hi = m_Final ^ 1;
-			while (sz >= POLY1305_BLOCK_BYTES) {
-				unsigned long u;
-				unsigned int i, j;
-				m_Msg.Put(buf, hi);
-				/* h += m */
-				m_H += m_Msg;
-
-				/* h *= r */
-				for (i = 0; i < 17; i++) {
-					u = 0;
-					for (j = 0; j <= i ; j++) {
-						u += (unsigned short)m_H.data[j] * m_R.data[i - j];
-					}
-					for (j = i + 1; j < 17; j++) {
-						unsigned long v = (unsigned short)m_H.data[j] * m_R.data[i + 17 - j];
-						v = ((v << 8) + (v << 6)); /* v *= (5 << 6); */
-						u += v;
-					}
-					m_HR[i] = u;
-				}
-				/* (partial) h %= p */
-				m_H %= m_HR;
-				buf += POLY1305_BLOCK_BYTES;
-				sz -= POLY1305_BLOCK_BYTES;
-			}
-		}
-
-		void Finish(uint64_t * out)
-		{
-			// process leftovers
-			if(m_Leftover)
-			{
-				size_t idx = m_Leftover;
-				m_Buffer[idx++] = 1;
-				for(; idx < POLY1305_BLOCK_BYTES; idx++)
-					m_Buffer[idx] = 0;
-				m_Final = 1;
-				Blocks(m_Buffer, POLY1305_BLOCK_BYTES);
-			}
-
-			// freeze H
-			~m_H;
-			// add pad
-			m_H += m_Pad;
-			// copy digest
-			memcpy(out, m_H, 16);
-		}
-
-		size_t m_Leftover;
-		poly1305::Buffer m_Buffer;
-		poly1305::Block m_H;
-		poly1305::Block m_R;
-		poly1305::Block m_Pad;
-		poly1305::Block m_Msg;
-		poly1305::LongBlock m_HR;
-		uint8_t m_Final;
-	};
-
-	void Poly1305HMAC(uint64_t * out, const uint64_t * key, const uint8_t * buf, std::size_t sz);
-}
-}
-#endif
-
-#endif

libi2pd/Profiling.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -10,6 +10,7 @@
 #include <unordered_map>
 #include <list>
 #include <thread>
+#include <iomanip>
 #include <boost/property_tree/ptree.hpp>
 #include <boost/property_tree/ini_parser.hpp>
 #include "Base.h"
@@ -26,23 +27,21 @@ namespace data
 	static i2p::fs::HashedStorage g_ProfilesStorage("peerProfiles", "p", "profile-", "txt");
 	static std::unordered_map<i2p::data::IdentHash, std::shared_ptr<RouterProfile> > g_Profiles;
 	static std::mutex g_ProfilesMutex;
-
-	static boost::posix_time::ptime GetTime ()
-	{
-		return boost::posix_time::second_clock::local_time();
-	}
-
+	static std::list<std::pair<i2p::data::IdentHash, std::function<void (std::shared_ptr<RouterProfile>)> > > g_PostponedUpdates;
+	static std::mutex g_PostponedUpdatesMutex;
+	
 	RouterProfile::RouterProfile ():
-		m_LastUpdateTime (GetTime ()), m_IsUpdated (false),
-		m_LastDeclineTime (0), m_LastUnreachableTime (0),
-		m_NumTunnelsAgreed (0), m_NumTunnelsDeclined (0), m_NumTunnelsNonReplied (0),
-		m_NumTimesTaken (0), m_NumTimesRejected (0), m_HasConnected (false)
+		m_IsUpdated (false), m_LastDeclineTime (0), m_LastUnreachableTime (0),
+		m_LastUpdateTime (i2p::util::GetSecondsSinceEpoch ()), m_LastAccessTime (0),
+		m_LastPersistTime (0), m_NumTunnelsAgreed (0), m_NumTunnelsDeclined (0),
+		m_NumTunnelsNonReplied (0),m_NumTimesTaken (0), m_NumTimesRejected (0),
+		m_HasConnected (false), m_IsDuplicated (false)
 	{
 	}
 
 	void RouterProfile::UpdateTime ()
 	{
-		m_LastUpdateTime = GetTime ();
+		m_LastUpdateTime = i2p::util::GetSecondsSinceEpoch ();
 		m_IsUpdated = true;
 	}
 
@@ -57,9 +56,11 @@ namespace data
 		usage.put (PEER_PROFILE_USAGE_TAKEN, m_NumTimesTaken);
 		usage.put (PEER_PROFILE_USAGE_REJECTED, m_NumTimesRejected);
 		usage.put (PEER_PROFILE_USAGE_CONNECTED, m_HasConnected);
+		if (m_IsDuplicated)
+			usage.put (PEER_PROFILE_USAGE_DUPLICATED, true);
 		// fill property tree
 		boost::property_tree::ptree pt;
-		pt.put (PEER_PROFILE_LAST_UPDATE_TIME, boost::posix_time::to_simple_string (m_LastUpdateTime));
+		pt.put (PEER_PROFILE_LAST_UPDATE_TIMESTAMP, m_LastUpdateTime);
 		if (m_LastUnreachableTime)
 			pt.put (PEER_PROFILE_LAST_UNREACHABLE_TIME, m_LastUnreachableTime);
 		pt.put_child (PEER_PROFILE_SECTION_PARTICIPATION, participation);
@@ -79,6 +80,7 @@ namespace data
 
 	void RouterProfile::Load (const IdentHash& identHash)
 	{
+		m_IsUpdated = false;
 		std::string ident = identHash.ToBase64 ();
 		std::string path = g_ProfilesStorage.Path(ident);
 		boost::property_tree::ptree pt;
@@ -101,10 +103,22 @@ namespace data
 
 		try
 		{
-			auto t = pt.get (PEER_PROFILE_LAST_UPDATE_TIME, "");
-			if (t.length () > 0)
-				m_LastUpdateTime = boost::posix_time::time_from_string (t);
-			if ((GetTime () - m_LastUpdateTime).hours () < PEER_PROFILE_EXPIRATION_TIMEOUT)
+			auto ts = pt.get (PEER_PROFILE_LAST_UPDATE_TIMESTAMP, 0);
+			if (ts)
+				m_LastUpdateTime = ts;
+			else	
+			{	
+				// try old lastupdatetime 
+				auto ut = pt.get (PEER_PROFILE_LAST_UPDATE_TIME, "");
+				if (ut.length () > 0)
+				{	
+					std::istringstream ss (ut); std::tm t;
+					ss >> std::get_time(&t, "%Y-%b-%d %H:%M:%S");
+					if (!ss.fail())
+						m_LastUpdateTime = mktime (&t); // t is local time
+				}	
+			}	
+			if (i2p::util::GetSecondsSinceEpoch () - m_LastUpdateTime < PEER_PROFILE_EXPIRATION_TIMEOUT)
 			{
 				m_LastUnreachableTime = pt.get (PEER_PROFILE_LAST_UNREACHABLE_TIME, 0);
 				try
@@ -126,6 +140,7 @@ namespace data
 					m_NumTimesTaken = usage.get (PEER_PROFILE_USAGE_TAKEN, 0);
 					m_NumTimesRejected = usage.get (PEER_PROFILE_USAGE_REJECTED, 0);
 					m_HasConnected = usage.get (PEER_PROFILE_USAGE_CONNECTED, false);
+					m_IsDuplicated = usage.get (PEER_PROFILE_USAGE_DUPLICATED, false);
 				}
 				catch (boost::property_tree::ptree_bad_path& ex)
 				{
@@ -178,6 +193,11 @@ namespace data
 		UpdateTime ();
 	}
 
+	void RouterProfile::Duplicated ()
+	{
+		m_IsDuplicated = true;
+	}	
+		
 	bool RouterProfile::IsLowPartcipationRate () const
 	{
 		return 4*m_NumTunnelsAgreed < m_NumTunnelsDeclined; // < 20% rate
@@ -189,10 +209,9 @@ namespace data
 		return m_NumTunnelsNonReplied > 10*(total + 1);
 	}
 
-	bool RouterProfile::IsDeclinedRecently ()
+	bool RouterProfile::IsDeclinedRecently (uint64_t ts)
 	{
 		if (!m_LastDeclineTime) return false;
-		auto ts = i2p::util::GetSecondsSinceEpoch ();
 		if (ts > m_LastDeclineTime + PEER_PROFILE_DECLINED_RECENTLY_INTERVAL ||
 		    ts + PEER_PROFILE_DECLINED_RECENTLY_INTERVAL < m_LastDeclineTime)
 			m_LastDeclineTime = 0;
@@ -201,7 +220,10 @@ namespace data
 
 	bool RouterProfile::IsBad ()
 	{
-		if (IsDeclinedRecently () || IsUnreachable ()) return true;
+		if (IsUnreachable () || m_IsDuplicated) return true;
+		auto ts = i2p::util::GetSecondsSinceEpoch ();
+		if (ts > PEER_PROFILE_MAX_DECLINED_INTERVAL + m_LastDeclineTime) return false;
+		if (IsDeclinedRecently (ts)) return true; 
 		auto isBad = IsAlwaysDeclining () || IsLowPartcipationRate () /*|| IsLowReplyRate ()*/;
 		if (isBad && m_NumTimesRejected > 10*(m_NumTimesTaken + 1))
 		{
@@ -236,30 +258,42 @@ namespace data
 			std::unique_lock<std::mutex> l(g_ProfilesMutex);
 			auto it = g_Profiles.find (identHash);
 			if (it != g_Profiles.end ())
+			{
+				it->second->SetLastAccessTime (i2p::util::GetSecondsSinceEpoch ());
 				return it->second;
+			}	
 		}
 		auto profile = netdb.NewRouterProfile ();
 		profile->Load (identHash); // if possible
-		std::unique_lock<std::mutex> l(g_ProfilesMutex);
+		std::lock_guard<std::mutex> l(g_ProfilesMutex);
 		g_Profiles.emplace (identHash, profile);
 		return profile;
 	}
 
 	bool IsRouterBanned (const IdentHash& identHash)
 	{
-		std::unique_lock<std::mutex> l(g_ProfilesMutex);
+		std::lock_guard<std::mutex> l(g_ProfilesMutex);
 		auto it = g_Profiles.find (identHash);
 		if (it != g_Profiles.end ())
 			return it->second->IsUnreachable ();
 		return false;
 	}	
+
+	bool IsRouterDuplicated (const IdentHash& identHash)
+	{
+		std::lock_guard<std::mutex> l(g_ProfilesMutex);
+		auto it = g_Profiles.find (identHash);
+		if (it != g_Profiles.end ())
+			return it->second->IsDuplicated ();
+		return false;
+	}	
 		
 	void InitProfilesStorage ()
 	{
 		g_ProfilesStorage.SetPlace(i2p::fs::GetDataDir());
 		g_ProfilesStorage.Init(i2p::data::GetBase64SubstitutionTable(), 64);
 	}
-
+		
 	static void SaveProfilesToDisk (std::list<std::pair<i2p::data::IdentHash, std::shared_ptr<RouterProfile> > >&& profiles)
 	{
 		for (auto& it: profiles)
@@ -268,18 +302,20 @@ namespace data
 		
 	std::future<void> PersistProfiles ()
 	{
-		auto ts = GetTime ();
+		auto ts = i2p::util::GetSecondsSinceEpoch ();
 		std::list<std::pair<i2p::data::IdentHash, std::shared_ptr<RouterProfile> > > tmp;
 		{
-			std::unique_lock<std::mutex> l(g_ProfilesMutex);
+			std::lock_guard<std::mutex> l(g_ProfilesMutex);
 			for (auto it = g_Profiles.begin (); it != g_Profiles.end ();)
 			{
-				if ((ts - it->second->GetLastUpdateTime ()).total_seconds () > PEER_PROFILE_PERSIST_INTERVAL)
+				if (it->second->IsUpdated () && ts > it->second->GetLastPersistTime () + PEER_PROFILE_PERSIST_INTERVAL)
 				{
-					if (it->second->IsUpdated ())
-						tmp.push_back (std::make_pair (it->first, it->second));
+					tmp.push_back (std::make_pair (it->first, it->second));
+					it->second->SetLastPersistTime (ts);
+					it->second->SetUpdated (false);
+				}	
+				if (!it->second->IsUpdated () && ts > std::max (it->second->GetLastUpdateTime (), it->second->GetLastAccessTime ()) + PEER_PROFILE_PERSIST_INTERVAL)
 					it = g_Profiles.erase (it);
-				}
 				else
 					it++;
 			}
@@ -293,12 +329,12 @@ namespace data
 	{
 		std::unordered_map<i2p::data::IdentHash, std::shared_ptr<RouterProfile> > tmp;
 		{
-			std::unique_lock<std::mutex> l(g_ProfilesMutex);
+			std::lock_guard<std::mutex> l(g_ProfilesMutex);
 			std::swap (tmp, g_Profiles);
 		}
-		auto ts = GetTime ();
+		auto ts = i2p::util::GetSecondsSinceEpoch ();
 		for (auto& it: tmp)
-			if (it.second->IsUseful() && (it.second->IsUpdated () || (ts - it.second->GetLastUpdateTime ()).total_seconds () < PEER_PROFILE_EXPIRATION_TIMEOUT*3600))
+			if (it.second->IsUseful() && (it.second->IsUpdated () || ts - it.second->GetLastUpdateTime () < PEER_PROFILE_EXPIRATION_TIMEOUT))
 				it.second->Save (it.first);
 	}
 
@@ -316,7 +352,7 @@ namespace data
 				LogPrint(eLogWarning, "Profiling: Can't stat(): ", path);
 				continue;
 			}
-			if (now - st.st_mtime >= PEER_PROFILE_EXPIRATION_TIMEOUT*3600) 
+			if (now - st.st_mtime >= PEER_PROFILE_EXPIRATION_TIMEOUT) 
 			{
 				LogPrint(eLogDebug, "Profiling: Removing expired peer profile: ", path);
 				i2p::fs::Remove(path);
@@ -327,11 +363,11 @@ namespace data
 	std::future<void> DeleteObsoleteProfiles ()
 	{
 		{
-			auto ts = GetTime ();
-			std::unique_lock<std::mutex> l(g_ProfilesMutex);
+			auto ts = i2p::util::GetSecondsSinceEpoch ();
+			std::lock_guard<std::mutex> l(g_ProfilesMutex);
 			for (auto it = g_Profiles.begin (); it != g_Profiles.end ();)
 			{
-				if ((ts - it->second->GetLastUpdateTime ()).total_seconds () >= PEER_PROFILE_EXPIRATION_TIMEOUT*3600)
+				if (ts - it->second->GetLastUpdateTime () >= PEER_PROFILE_EXPIRATION_TIMEOUT)
 					it = g_Profiles.erase (it);
 				else
 					it++;
@@ -340,5 +376,47 @@ namespace data
 
 		return std::async (std::launch::async, DeleteFilesFromDisk);
 	}
+
+	bool UpdateRouterProfile (const IdentHash& identHash, std::function<void (std::shared_ptr<RouterProfile>)> update)
+	{
+		if (!update) return true;
+		std::shared_ptr<RouterProfile> profile;
+		{
+			std::lock_guard<std::mutex> l(g_ProfilesMutex);
+			auto it = g_Profiles.find (identHash);
+			if (it != g_Profiles.end ())
+				profile = it->second;
+		}
+		if (profile)
+		{
+			update (profile);
+			return true;
+		}	
+		// postpone
+		std::lock_guard<std::mutex> l(g_PostponedUpdatesMutex);
+		g_PostponedUpdates.emplace_back (identHash, update);
+		return false;
+	}	
+
+	static void ApplyPostponedUpdates (std::list<std::pair<i2p::data::IdentHash, std::function<void (std::shared_ptr<RouterProfile>)> > >&& updates)
+	{
+		for (const auto& [ident, update] : updates)
+		{
+			auto profile = GetRouterProfile (ident);
+			update (profile);
+		}	
+	}	
+		
+	std::future<void> FlushPostponedRouterProfileUpdates ()
+	{
+		if (g_PostponedUpdates.empty ()) return std::future<void>();
+
+		std::list<std::pair<i2p::data::IdentHash, std::function<void (std::shared_ptr<RouterProfile>)> > > updates;
+		{
+			std::lock_guard<std::mutex> l(g_PostponedUpdatesMutex);
+			g_PostponedUpdates.swap (updates);
+		}		
+		return std::async (std::launch::async, ApplyPostponedUpdates, std::move (updates));	
+	}	
 }
 }

libi2pd/Profiling.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -11,7 +11,8 @@
 
 #include <memory>
 #include <future>
-#include <boost/date_time/posix_time/posix_time.hpp>
+#include <functional>
+#include <boost/asio.hpp>
 #include "Identity.h"
 
 namespace i2p
@@ -22,7 +23,8 @@ namespace data
 	const char PEER_PROFILE_SECTION_PARTICIPATION[] = "participation";
 	const char PEER_PROFILE_SECTION_USAGE[] = "usage";
 	// params
-	const char PEER_PROFILE_LAST_UPDATE_TIME[] = "lastupdatetime";
+	const char PEER_PROFILE_LAST_UPDATE_TIME[] = "lastupdatetime"; // deprecated
+	const char PEER_PROFILE_LAST_UPDATE_TIMESTAMP[] = "lastupdatetimestamp";
 	const char PEER_PROFILE_LAST_UNREACHABLE_TIME[] = "lastunreachabletime";
 	const char PEER_PROFILE_PARTICIPATION_AGREED[] = "agreed";
 	const char PEER_PROFILE_PARTICIPATION_DECLINED[] = "declined";
@@ -30,17 +32,22 @@ namespace data
 	const char PEER_PROFILE_USAGE_TAKEN[] = "taken";
 	const char PEER_PROFILE_USAGE_REJECTED[] = "rejected";
 	const char PEER_PROFILE_USAGE_CONNECTED[] = "connected";
+	const char PEER_PROFILE_USAGE_DUPLICATED[] = "duplicated";
 	
-	const int PEER_PROFILE_EXPIRATION_TIMEOUT = 36; // in hours (1.5 days)
+	const int PEER_PROFILE_EXPIRATION_TIMEOUT = 36*60*60; // in seconds (1.5 days)
 	const int PEER_PROFILE_AUTOCLEAN_TIMEOUT = 1500; // in seconds (25 minutes)
 	const int PEER_PROFILE_AUTOCLEAN_VARIANCE = 900; // in seconds (15 minutes)
 	const int PEER_PROFILE_OBSOLETE_PROFILES_CLEAN_TIMEOUT = 5400; // in seconds (1.5 hours)
 	const int PEER_PROFILE_OBSOLETE_PROFILES_CLEAN_VARIANCE = 2400; // in seconds (40 minutes)
-	const int PEER_PROFILE_DECLINED_RECENTLY_INTERVAL = 150; // in seconds (2.5 minutes)
+	const int PEER_PROFILE_DECLINED_RECENTLY_INTERVAL = 330; // in seconds (5.5 minutes)
+	const int PEER_PROFILE_MAX_DECLINED_INTERVAL = 4400; // in second (1.5 hours)
 	const int PEER_PROFILE_PERSIST_INTERVAL = 3300; // in seconds (55 minutes)
 	const int PEER_PROFILE_UNREACHABLE_INTERVAL = 480; // in seconds (8 minutes)
 	const int PEER_PROFILE_USEFUL_THRESHOLD = 3;
-
+	const int PEER_PROFILE_ALWAYS_DECLINING_NUM = 5; // num declines in row to consider always declined
+	const int PEER_PROFILE_APPLY_POSTPONED_TIMEOUT = 2100; // in milliseconds	
+	const int PEER_PROFILE_APPLY_POSTPONED_TIMEOUT_VARIANCE = 500; // in milliseconds	
+	
 	class RouterProfile
 	{
 		public:
@@ -59,11 +66,23 @@ namespace data
 
 			void Unreachable (bool unreachable);
 			void Connected ();
+			void Duplicated ();
 
-			boost::posix_time::ptime GetLastUpdateTime () const { return m_LastUpdateTime; };
+			uint64_t GetLastUpdateTime () const { return m_LastUpdateTime; };
 			bool IsUpdated () const { return m_IsUpdated; };
+			void SetUpdated (bool updated) { m_IsUpdated = updated; }
+			uint64_t GetLastAccessTime () const { return m_LastAccessTime; };
+			void SetLastAccessTime (uint64_t ts) { m_LastAccessTime = ts; };
+			uint64_t GetLastPersistTime () const { return m_LastPersistTime; };
+			void SetLastPersistTime (uint64_t ts) { m_LastPersistTime = ts; };
 			
 			bool IsUseful() const;
+			bool IsDuplicated () const { return m_IsDuplicated; };
+
+			const boost::asio::ip::udp::endpoint& GetLastEndpoint () const { return m_LastEndpoint; }
+			void SetLastEndpoint (const boost::asio::ip::udp::endpoint& ep) { m_LastEndpoint = ep; }
+			bool HasLastEndpoint (bool v4) const { return !m_LastEndpoint.address ().is_unspecified () && m_LastEndpoint.port () && 
+				((v4 && m_LastEndpoint.address ().is_v4 ()) || (!v4 && m_LastEndpoint.address ().is_v6 ())); }
 			
 		private:
 
@@ -72,13 +91,13 @@ namespace data
 			bool IsAlwaysDeclining () const { return !m_NumTunnelsAgreed && m_NumTunnelsDeclined >= 5; };
 			bool IsLowPartcipationRate () const;
 			bool IsLowReplyRate () const;
-			bool IsDeclinedRecently ();
+			bool IsDeclinedRecently (uint64_t ts);
 
 		private:
 
-			boost::posix_time::ptime m_LastUpdateTime; // TODO: use std::chrono
 			bool m_IsUpdated;
-			uint64_t m_LastDeclineTime, m_LastUnreachableTime; // in seconds
+			uint64_t m_LastDeclineTime, m_LastUnreachableTime, m_LastUpdateTime, 
+				m_LastAccessTime, m_LastPersistTime; // in seconds
 			// participation
 			uint32_t m_NumTunnelsAgreed;
 			uint32_t m_NumTunnelsDeclined;
@@ -87,14 +106,20 @@ namespace data
 			uint32_t m_NumTimesTaken;
 			uint32_t m_NumTimesRejected;
 			bool m_HasConnected; // successful trusted(incoming or NTCP2) connection 
+			bool m_IsDuplicated;
+			// connectivity
+			boost::asio::ip::udp::endpoint m_LastEndpoint; // SSU2 for non-published addresses
 	};
 
 	std::shared_ptr<RouterProfile> GetRouterProfile (const IdentHash& identHash);
 	bool IsRouterBanned (const IdentHash& identHash); // check only existing profiles
+	bool IsRouterDuplicated (const IdentHash& identHash); // check only existing profiles
 	void InitProfilesStorage ();
 	std::future<void> DeleteObsoleteProfiles ();
 	void SaveProfiles ();
 	std::future<void> PersistProfiles ();
+	bool UpdateRouterProfile (const IdentHash& identHash, std::function<void (std::shared_ptr<RouterProfile>)> update); // return true if updated immediately, and false if postponed
+	std::future<void> FlushPostponedRouterProfileUpdates ();
 }
 }
 

libi2pd/Queue.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2020, The PurpleI2P Project
+* Copyright (c) 2013-2024, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -9,8 +9,7 @@
 #ifndef QUEUE_H__
 #define QUEUE_H__
 
-#include <queue>
-#include <vector>
+#include <list>
 #include <mutex>
 #include <thread>
 #include <condition_variable>
@@ -29,22 +28,20 @@ namespace util
 			void Put (Element e)
 			{
 				std::unique_lock<std::mutex> l(m_QueueMutex);
-				m_Queue.push (std::move(e));
+				m_Queue.push_back (std::move(e));
 				m_NonEmpty.notify_one ();
 			}
 
-			template<template<typename, typename...>class Container, typename... R>
-			void Put (const Container<Element, R...>& vec)
+			void Put (std::list<Element>& list)
 			{
-				if (!vec.empty ())
+				if (!list.empty ())
 				{
 					std::unique_lock<std::mutex> l(m_QueueMutex);
-					for (const auto& it: vec)
-						m_Queue.push (std::move(it));
+					m_Queue.splice (m_Queue.end (), list); 
 					m_NonEmpty.notify_one ();
-				}
-			}
-
+				}	
+			}		
+		
 			Element GetNext ()
 			{
 				std::unique_lock<std::mutex> l(m_QueueMutex);
@@ -87,7 +84,7 @@ namespace util
 				return m_Queue.empty ();
 			}
 
-			int GetSize ()
+			int GetSize () const
 			{
 				std::unique_lock<std::mutex> l(m_QueueMutex);
 				return m_Queue.size ();
@@ -107,15 +104,28 @@ namespace util
 				return GetNonThreadSafe (true);
 			}
 
-		private:
+			void GetWholeQueue (std::list<Element>& queue)
+			{
+				if (!queue.empty ())
+				{	
+					std::list<Element> newQueue;
+					queue.swap (newQueue);
+				}	
+				{
+					std::unique_lock<std::mutex> l(m_QueueMutex);
+					m_Queue.swap (queue);
+				}
+			}		
 
+		private:
+		
 			Element GetNonThreadSafe (bool peek = false)
 			{
 				if (!m_Queue.empty ())
 				{
 					auto el = m_Queue.front ();
 					if (!peek)
-						m_Queue.pop ();
+						m_Queue.pop_front ();
 					return el;
 				}
 				return nullptr;
@@ -123,8 +133,8 @@ namespace util
 
 		private:
 
-			std::queue<Element> m_Queue;
-			std::mutex m_QueueMutex;
+			std::list<Element> m_Queue;
+			mutable std::mutex m_QueueMutex;
 			std::condition_variable m_NonEmpty;
 	};
 }

libi2pd/Reseed.cpp

@@ -552,7 +552,7 @@ namespace data
 		if (!url.port)
 			url.port = 443;
 
-		boost::asio::io_service service;
+		boost::asio::io_context service;
 		boost::system::error_code ecode;
 
 		boost::asio::ssl::context ctx(boost::asio::ssl::context::sslv23);
@@ -562,11 +562,10 @@ namespace data
 		if(proxyUrl.schema.size())
 		{
 			// proxy connection
-			auto it = boost::asio::ip::tcp::resolver(service).resolve (
-				boost::asio::ip::tcp::resolver::query (proxyUrl.host, std::to_string(proxyUrl.port)), ecode);
+			auto it = boost::asio::ip::tcp::resolver(service).resolve (proxyUrl.host, std::to_string(proxyUrl.port), ecode);
 			if(!ecode)
 			{
-				s.lowest_layer().connect(*it, ecode);
+				s.lowest_layer().connect(*it.begin (), ecode);
 				if(!ecode)
 				{
 					auto & sock = s.next_layer();
@@ -599,7 +598,7 @@ namespace data
 							LogPrint(eLogError, "Reseed: HTTP CONNECT read error: ", ecode.message());
 							return "";
 						}
-						if(proxyRes.parse(boost::asio::buffer_cast<const char *>(readbuf.data()), readbuf.size()) <= 0)
+						if(proxyRes.parse(std::string {boost::asio::buffers_begin(readbuf.data ()), boost::asio::buffers_begin(readbuf.data ()) + readbuf.size ()}) <= 0)
 						{
 							sock.close();
 							LogPrint(eLogError, "Reseed: HTTP CONNECT malformed reply");
@@ -638,15 +637,13 @@ namespace data
 		else
 		{
 			// direct connection
-			auto it = boost::asio::ip::tcp::resolver(service).resolve (
-				boost::asio::ip::tcp::resolver::query (url.host, std::to_string(url.port)), ecode);
+			auto endpoints = boost::asio::ip::tcp::resolver(service).resolve (url.host, std::to_string(url.port), ecode);
 			if (!ecode)
 			{
 				bool connected = false;
-				boost::asio::ip::tcp::resolver::iterator end;
-				while (it != end)
+				for (const auto& it: endpoints)
 				{
-					boost::asio::ip::tcp::endpoint ep = *it;
+					boost::asio::ip::tcp::endpoint ep = it;
 					bool supported = false;
 					if (!ep.address ().is_unspecified ())
 					{
@@ -666,7 +663,6 @@ namespace data
 							break;
 						}
 					}
-					it++;
 				}
 				if (!connected)
 				{
@@ -746,19 +742,16 @@ namespace data
 		if (!url.port) url.port = 80;
 
 		boost::system::error_code ecode;
-		boost::asio::io_service service;
+		boost::asio::io_context service;
 		boost::asio::ip::tcp::socket s(service, boost::asio::ip::tcp::v6());
 
-		auto it = boost::asio::ip::tcp::resolver(service).resolve (
-			boost::asio::ip::tcp::resolver::query (url.host, std::to_string(url.port)), ecode);
-
+		auto endpoints = boost::asio::ip::tcp::resolver(service).resolve (url.host, std::to_string(url.port), ecode);
 		if (!ecode)
 		{
 			bool connected = false;
-			boost::asio::ip::tcp::resolver::iterator end;
-			while (it != end)
+			for (const auto& it: endpoints)
 			{
-				boost::asio::ip::tcp::endpoint ep = *it;
+				boost::asio::ip::tcp::endpoint ep = it;
 				if (
 					i2p::util::net::IsYggdrasilAddress (ep.address ()) &&
 					i2p::context.SupportsMesh ()
@@ -772,7 +765,6 @@ namespace data
 						break;
 					}
 				}
-				it++;
 			}
 			if (!connected)
 			{

libi2pd/RouterContext.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -33,13 +33,14 @@ namespace i2p
 		m_ShareRatio (100), m_Status (eRouterStatusUnknown), m_StatusV6 (eRouterStatusUnknown),
 		m_Error (eRouterErrorNone), m_ErrorV6 (eRouterErrorNone),
 		m_Testing (false), m_TestingV6 (false), m_NetID (I2PD_NET_ID),
-		m_PublishReplyToken (0), m_IsHiddenMode (false)
+		m_PublishReplyToken (0), m_IsHiddenMode (false), 
+		m_Rng(i2p::util::GetMonotonicMicroseconds () % 1000000LL), m_IsSaving (false)
 	{
 	}
 
 	void RouterContext::Init ()
 	{
-		srand (i2p::util::GetMillisecondsSinceEpoch () % 1000);
+		srand (m_Rng () % 1000);
 		m_StartupTime = i2p::util::GetMonotonicSeconds ();
 
 		if (!Load ())
@@ -57,11 +58,8 @@ namespace i2p
 		{	
 			m_Service.reset (new RouterService);
 			m_Service->Start ();
-			if (!m_IsHiddenMode)
-			{
-				m_PublishTimer.reset (new boost::asio::deadline_timer (m_Service->GetService ()));
-				ScheduleInitialPublish ();
-			}	
+			m_PublishTimer.reset (new boost::asio::deadline_timer (m_Service->GetService ()));
+			ScheduleInitialPublish ();
 			m_CongestionUpdateTimer.reset (new boost::asio::deadline_timer (m_Service->GetService ()));
 			ScheduleCongestionUpdate ();
 			m_CleanupTimer.reset (new boost::asio::deadline_timer (m_Service->GetService ()));
@@ -78,9 +76,16 @@ namespace i2p
 			if (m_CongestionUpdateTimer)
 				m_CongestionUpdateTimer->cancel ();
 			m_Service->Stop ();
-		}	
+			CleanUp (); // GarlicDestination
+		}
 	}	
-	
+
+	std::shared_ptr<i2p::data::RouterInfo::Buffer> RouterContext::CopyRouterInfoBuffer () const
+	{
+		std::lock_guard<std::mutex> l(m_RouterInfoMutex);
+		return m_RouterInfo.CopyBuffer ();
+	}	
+		
 	void RouterContext::CreateNewRouter ()
 	{
 		m_Keys = i2p::data::PrivateKeys::CreateRandomKeys (i2p::data::SIGNING_KEY_TYPE_EDDSA_SHA512_ED25519,
@@ -136,7 +141,7 @@ namespace i2p
 				{
 					boost::asio::ip::address addr;
 					if (!host.empty ())
-						addr = boost::asio::ip::address::from_string (host);
+						addr = boost::asio::ip::make_address (host);
 					if (!addr.is_v4())
 						addr = boost::asio::ip::address_v4 ();
 					routerInfo.AddNTCP2Address (m_NTCP2Keys->staticPublicKey, m_NTCP2Keys->iv, addr, ntcp2Port);
@@ -157,7 +162,7 @@ namespace i2p
 				{
 					boost::asio::ip::address addr;
 					if (!host.empty ())
-						addr = boost::asio::ip::address::from_string (host);
+						addr = boost::asio::ip::make_address (host);
 					if (!addr.is_v4())
 						addr = boost::asio::ip::address_v4 ();
 					routerInfo.AddSSU2Address (m_SSU2Keys->staticPublicKey, m_SSU2Keys->intro, addr, ssu2Port);
@@ -188,7 +193,7 @@ namespace i2p
 						ntcp2Host = host;
 					boost::asio::ip::address addr;
 					if (!ntcp2Host.empty ())
-						addr = boost::asio::ip::address::from_string (ntcp2Host);
+						addr = boost::asio::ip::make_address (ntcp2Host);
 					if (!addr.is_v6())
 						addr = boost::asio::ip::address_v6 ();
 					routerInfo.AddNTCP2Address (m_NTCP2Keys->staticPublicKey, m_NTCP2Keys->iv, addr, ntcp2Port);
@@ -207,7 +212,7 @@ namespace i2p
 				{
 					boost::asio::ip::address addr;
 					if (!host.empty ())
-						addr = boost::asio::ip::address::from_string (host);
+						addr = boost::asio::ip::make_address (host);
 					if (!addr.is_v6())
 						addr = boost::asio::ip::address_v6 ();
 					routerInfo.AddSSU2Address (m_SSU2Keys->staticPublicKey, m_SSU2Keys->intro, addr, ssu2Port);
@@ -249,8 +254,36 @@ namespace i2p
 
 	void RouterContext::UpdateRouterInfo ()
 	{
-		m_RouterInfo.CreateBuffer (m_Keys);
-		m_RouterInfo.SaveToFile (i2p::fs::DataDirPath (ROUTER_INFO));
+		std::shared_ptr<i2p::data::RouterInfo::Buffer> buffer;
+		{
+			std::lock_guard<std::mutex> l(m_RouterInfoMutex);
+			m_RouterInfo.CreateBuffer (m_Keys);
+			buffer = m_RouterInfo.CopyBuffer ();
+		}
+		{
+			// update save buffer to latest
+			std::lock_guard<std::mutex> l(m_SaveBufferMutex);
+			m_SaveBuffer = buffer;
+		}
+		bool isSaving = false;
+		if (m_IsSaving.compare_exchange_strong (isSaving, true)) // try to save only if not being saved
+		{	
+			auto savingRouterInfo = std::async (std::launch::async, [this]() 
+				{
+					std::shared_ptr<i2p::data::RouterInfo::Buffer> buffer;
+					while (m_SaveBuffer)
+					{
+						{
+							std::lock_guard<std::mutex> l(m_SaveBufferMutex);
+							buffer = m_SaveBuffer;
+							m_SaveBuffer = nullptr;
+						}
+						if (buffer)
+							i2p::data::RouterInfo::SaveToFile (i2p::fs::DataDirPath (ROUTER_INFO), buffer);
+					}	
+					m_IsSaving = false;
+				});
+		}	
 		m_LastUpdateTime = i2p::util::GetSecondsSinceEpoch ();
 	}
 
@@ -316,6 +349,12 @@ namespace i2p
 				case eRouterStatusFirewalled:
 					SetUnreachable (true, false); // ipv4
 				break;
+				case eRouterStatusMesh:
+					m_RouterInfo.UpdateCaps (m_RouterInfo.GetCaps () | i2p::data::RouterInfo::eReachable);
+				break;	
+				case eRouterStatusProxy:
+					m_RouterInfo.UpdateCaps (m_RouterInfo.GetCaps () | i2p::data::RouterInfo::eUnreachable);
+				break;	
 				default:
 					;
 			}
@@ -546,6 +585,12 @@ namespace i2p
 			UpdateRouterInfo ();
 	}
 
+	void RouterContext::UpdateSSU2Introducer (const i2p::data::IdentHash& h, bool v4, uint32_t iTag, uint32_t iExp)
+	{
+		if (m_RouterInfo.UpdateSSU2Introducer (h, v4, iTag, iExp))
+			UpdateRouterInfo ();
+	}	
+		
 	void RouterContext::ClearSSU2Introducers (bool v4)
 	{
 		auto addr = m_RouterInfo.GetSSU2Address (v4);
@@ -603,8 +648,8 @@ namespace i2p
 			case i2p::data::CAPS_FLAG_LOW_BANDWIDTH1   : limit = 12; type = low;   break;
 			case i2p::data::CAPS_FLAG_LOW_BANDWIDTH2   : limit = i2p::data::LOW_BANDWIDTH_LIMIT; type = low;   break; // 48
 			case i2p::data::CAPS_FLAG_LOW_BANDWIDTH3  : limit = 64; type = low;  break;
-			case i2p::data::CAPS_FLAG_HIGH_BANDWIDTH1  : limit = 128; type = high;  break;
-			case i2p::data::CAPS_FLAG_HIGH_BANDWIDTH2  : limit = i2p::data::HIGH_BANDWIDTH_LIMIT; type = high;  break; // 256
+			case i2p::data::CAPS_FLAG_LOW_BANDWIDTH4  : limit = 128; type = low;  break;
+			case i2p::data::CAPS_FLAG_HIGH_BANDWIDTH  : limit = i2p::data::HIGH_BANDWIDTH_LIMIT; type = high;  break; // 256
 			case i2p::data::CAPS_FLAG_EXTRA_BANDWIDTH1 : limit = i2p::data::EXTRA_BANDWIDTH_LIMIT; type = extra; break; // 2048
 			case i2p::data::CAPS_FLAG_EXTRA_BANDWIDTH2 : limit = 1000000; type = unlim; break; // 1Gbyte/s
 			default:
@@ -619,9 +664,7 @@ namespace i2p
 			case low   : /* not set */; break;
 			case extra : caps |= i2p::data::RouterInfo::eExtraBandwidth; break; // 'P'
 			case unlim : caps |= i2p::data::RouterInfo::eExtraBandwidth;
-#if (__cplusplus >= 201703L) // C++ 17 or higher
 			[[fallthrough]];
-#endif
 			// no break here, extra + high means 'X'
 			case high : caps |= i2p::data::RouterInfo::eHighBandwidth; break;
 		}
@@ -785,7 +828,7 @@ namespace i2p
 							i2p::config::GetOption("host", ntcp2Host);
 						if (!ntcp2Host.empty () && ntcp2Port)
 						{
-							auto addr = boost::asio::ip::address::from_string (ntcp2Host);
+							auto addr = boost::asio::ip::make_address (ntcp2Host);
 							if (addr.is_v6 ())
 							{
 								m_RouterInfo.AddNTCP2Address (m_NTCP2Keys->staticPublicKey, m_NTCP2Keys->iv, addr, ntcp2Port);
@@ -814,7 +857,7 @@ namespace i2p
 						std::string host; i2p::config::GetOption("host", host);
 						if (!host.empty ())
 						{
-						    auto addr = boost::asio::ip::address::from_string (host);
+						    auto addr = boost::asio::ip::make_address (host);
 							if (addr.is_v6 ())
 							{
 								m_RouterInfo.AddSSU2Address (m_SSU2Keys->staticPublicKey, m_SSU2Keys->intro, addr, ssu2Port);
@@ -883,7 +926,7 @@ namespace i2p
 						std::string host; i2p::config::GetOption("host", host);
 						if (!host.empty ())
 						{
-						    auto addr = boost::asio::ip::address::from_string (host);
+						    auto addr = boost::asio::ip::make_address (host);
 							if (addr.is_v4 ())
 							{
 								m_RouterInfo.AddNTCP2Address (m_NTCP2Keys->staticPublicKey, m_NTCP2Keys->iv, addr, ntcp2Port);
@@ -913,7 +956,7 @@ namespace i2p
 						std::string host; i2p::config::GetOption("host", host);
 						if (!host.empty ())
 						{
-						    auto addr = boost::asio::ip::address::from_string (host);
+						    auto addr = boost::asio::ip::make_address (host);
 							if (addr.is_v4 ())
 							{
 								m_RouterInfo.AddSSU2Address (m_SSU2Keys->staticPublicKey, m_SSU2Keys->intro, addr, ssu2Port);
@@ -1168,7 +1211,7 @@ namespace i2p
 	void RouterContext::ProcessGarlicMessage (std::shared_ptr<I2NPMessage> msg)
 	{
 		if (m_Service)
-			m_Service->GetService ().post (std::bind (&RouterContext::PostGarlicMessage, this, msg));
+			boost::asio::post (m_Service->GetService (), std::bind (&RouterContext::PostGarlicMessage, this, msg));
 		else
 			LogPrint (eLogError, "Router: service is NULL");
 	}
@@ -1196,7 +1239,7 @@ namespace i2p
 	void RouterContext::ProcessDeliveryStatusMessage (std::shared_ptr<I2NPMessage> msg)
 	{
 		if (m_Service)
-			m_Service->GetService ().post (std::bind (&RouterContext::PostDeliveryStatusMessage, this, msg));
+			boost::asio::post (m_Service->GetService (), std::bind (&RouterContext::PostDeliveryStatusMessage, this, msg));
 		else
 			LogPrint (eLogError, "Router: service is NULL");
 	}
@@ -1225,7 +1268,7 @@ namespace i2p
 			} data;
 			memcpy (data.k, key, 32);
 			data.t = tag;
-			m_Service->GetService ().post ([this,data](void)
+			boost::asio::post (m_Service->GetService (), [this,data](void)
 				{
 					AddECIESx25519Key (data.k, data.t);
 				});
@@ -1324,9 +1367,15 @@ namespace i2p
 		if (ecode != boost::asio::error::operation_aborted)
 		{	
 			if (m_RouterInfo.IsReachableBy (i2p::data::RouterInfo::eAllTransports))
+			{
+				UpdateCongestion ();
 				HandlePublishTimer (ecode);
+			}	
 			else
+			{	
+				UpdateTimestamp (i2p::util::GetSecondsSinceEpoch ());	
 				ScheduleInitialPublish ();
+			}		
 		}	
 	}	
 	
@@ -1336,7 +1385,7 @@ namespace i2p
 		{	
 			m_PublishTimer->cancel ();
 			m_PublishTimer->expires_from_now (boost::posix_time::seconds(ROUTER_INFO_PUBLISH_INTERVAL + 
-				rand () % ROUTER_INFO_PUBLISH_INTERVAL_VARIANCE));
+				m_Rng () % ROUTER_INFO_PUBLISH_INTERVAL_VARIANCE));
 			m_PublishTimer->async_wait (std::bind (&RouterContext::HandlePublishTimer,
 				this, std::placeholders::_1));
 		}	
@@ -1348,16 +1397,21 @@ namespace i2p
 	{
 		if (ecode != boost::asio::error::operation_aborted)
 		{
-			m_PublishExcluded.clear ();
-			m_PublishReplyToken = 0;
-			if (IsFloodfill ())
-			{	
-				UpdateStats (); // for floodfill
-				m_PublishExcluded.insert (i2p::context.GetIdentHash ()); // don't publish to ourselves
-			}	
 			UpdateTimestamp (i2p::util::GetSecondsSinceEpoch ());
-			Publish ();	
-			SchedulePublishResend ();
+			if (!m_IsHiddenMode)
+			{	
+				m_PublishExcluded.clear ();
+				m_PublishReplyToken = 0;
+				if (IsFloodfill ())
+				{	
+					UpdateStats (); // for floodfill
+					m_PublishExcluded.insert (i2p::context.GetIdentHash ()); // don't publish to ourselves
+				}		
+				Publish ();	
+				SchedulePublishResend ();
+			}	
+			else
+				SchedulePublish ();
 		}	
 	}	
 	
@@ -1380,10 +1434,11 @@ namespace i2p
 			auto onDrop = [this]()
 				{
 					if (m_Service)
-						m_Service->GetService ().post ([this]() { HandlePublishResendTimer (boost::system::error_code ()); });
+						boost::asio::post (m_Service->GetService (), [this]() { HandlePublishResendTimer (boost::system::error_code ()); });
 				};
-			if (floodfill->IsReachableFrom (i2p::context.GetRouterInfo ()) || // are we able to connect?
-				i2p::transport::transports.IsConnected (floodfill->GetIdentHash ())) // already connected ?
+			if (i2p::transport::transports.IsConnected (floodfill->GetIdentHash ()) || // already connected
+				(floodfill->IsReachableFrom (i2p::context.GetRouterInfo ()) && // are we able to connect
+				 !i2p::transport::transports.RoutesRestricted ())) // and routes not restricted
 			{	
 				// send directly
 				auto msg = CreateDatabaseStoreMsg (i2p::context.GetSharedRouterInfo (), replyToken);
@@ -1405,7 +1460,7 @@ namespace i2p
 						i2p::garlic::WrapECIESX25519MessageForRouter (msg, floodfill->GetIdentity ()->GetEncryptionPublicKey ()));
 				}	
 				else
-					LogPrint (eLogInfo, "Router: Can't publish our RouterInfo. No tunnles. Try again in ", ROUTER_INFO_CONFIRMATION_TIMEOUT, " seconds");
+					LogPrint (eLogInfo, "Router: Can't publish our RouterInfo. No tunnels. Try again in ", ROUTER_INFO_CONFIRMATION_TIMEOUT, " milliseconds");
 			}
 			m_PublishExcluded.insert (floodfill->GetIdentHash ());
 			m_PublishReplyToken = replyToken;
@@ -1419,7 +1474,7 @@ namespace i2p
 		if (m_PublishTimer)
 		{
 			m_PublishTimer->cancel ();
-			m_PublishTimer->expires_from_now (boost::posix_time::seconds(ROUTER_INFO_CONFIRMATION_TIMEOUT));
+			m_PublishTimer->expires_from_now (boost::posix_time::milliseconds(ROUTER_INFO_CONFIRMATION_TIMEOUT));
 			m_PublishTimer->async_wait (std::bind (&RouterContext::HandlePublishResendTimer,
 				this, std::placeholders::_1));
 		}	
@@ -1442,7 +1497,8 @@ namespace i2p
 		if (m_CongestionUpdateTimer)
 		{	
 			m_CongestionUpdateTimer->cancel ();
-			m_CongestionUpdateTimer->expires_from_now (boost::posix_time::seconds(ROUTER_INFO_CONGESTION_UPDATE_INTERVAL));
+			m_CongestionUpdateTimer->expires_from_now (boost::posix_time::seconds(
+				ROUTER_INFO_CONGESTION_UPDATE_INTERVAL + m_Rng () % ROUTER_INFO_CONGESTION_UPDATE_INTERVAL_VARIANCE));
 			m_CongestionUpdateTimer->async_wait (std::bind (&RouterContext::HandleCongestionUpdateTimer,
 				this, std::placeholders::_1));
 		}	
@@ -1454,29 +1510,34 @@ namespace i2p
 	{
 		if (ecode != boost::asio::error::operation_aborted)
 		{
-			auto c = i2p::data::RouterInfo::eLowCongestion;
-			if (!AcceptsTunnels () || !m_ShareRatio)
-				c = i2p::data::RouterInfo::eRejectAll;
-			else
-			{
-				int congestionLevel = GetCongestionLevel (true);
-				if (congestionLevel > CONGESTION_LEVEL_HIGH)
-					c = i2p::data::RouterInfo::eHighCongestion;
-				else if (congestionLevel > CONGESTION_LEVEL_MEDIUM)
-					c = i2p::data::RouterInfo::eMediumCongestion;
-			}
-			if (m_RouterInfo.UpdateCongestion (c))
-				UpdateRouterInfo ();
+			UpdateCongestion ();
 			ScheduleCongestionUpdate ();
 		}	
 	}	
 
+	void RouterContext::UpdateCongestion ()
+	{
+		auto c = i2p::data::RouterInfo::eLowCongestion;
+		if (!AcceptsTunnels () || !m_ShareRatio)                                        	
+			c = i2p::data::RouterInfo::eRejectAll;
+		else
+		{
+			int congestionLevel = GetCongestionLevel (true);
+			if (congestionLevel > CONGESTION_LEVEL_HIGH)
+				c = i2p::data::RouterInfo::eHighCongestion;
+			else if (congestionLevel > CONGESTION_LEVEL_MEDIUM)
+				c = i2p::data::RouterInfo::eMediumCongestion;
+		}
+		if (m_RouterInfo.UpdateCongestion (c))
+			UpdateRouterInfo ();
+	}	
+		
 	void RouterContext::ScheduleCleanupTimer ()
 	{
 		if (m_CleanupTimer)
 		{	
 			m_CleanupTimer->cancel ();
-			m_CleanupTimer->expires_from_now (boost::posix_time::minutes(ROUTER_INFO_CLEANUP_INTERVAL));
+			m_CleanupTimer->expires_from_now (boost::posix_time::seconds(ROUTER_INFO_CLEANUP_INTERVAL));
 			m_CleanupTimer->async_wait (std::bind (&RouterContext::HandleCleanupTimer,
 				this, std::placeholders::_1));
 		}	

libi2pd/RouterContext.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -12,7 +12,8 @@
 #include <inttypes.h>
 #include <string>
 #include <memory>
-#include <set>
+#include <random>
+#include <unordered_set>
 #include <boost/asio.hpp>
 #include "Identity.h"
 #include "RouterInfo.h"
@@ -34,10 +35,11 @@ namespace garlic
 	const int ROUTER_INFO_PUBLISH_INTERVAL = 39*60; // in seconds
 	const int ROUTER_INFO_INITIAL_PUBLISH_INTERVAL = 10; // in seconds
 	const int ROUTER_INFO_PUBLISH_INTERVAL_VARIANCE = 105;// in seconds
-	const int ROUTER_INFO_CONFIRMATION_TIMEOUT = 5; // in seconds
+	const int ROUTER_INFO_CONFIRMATION_TIMEOUT = 1600; // in milliseconds
 	const int ROUTER_INFO_MAX_PUBLISH_EXCLUDED_FLOODFILLS = 15;
-	const int ROUTER_INFO_CONGESTION_UPDATE_INTERVAL = 12*60; // in seconds
-	const int ROUTER_INFO_CLEANUP_INTERVAL = 5; // in minutes
+	const int ROUTER_INFO_CONGESTION_UPDATE_INTERVAL = 11*60; // in seconds
+	const int ROUTER_INFO_CONGESTION_UPDATE_INTERVAL_VARIANCE = 130; // in seconds 
+	const int ROUTER_INFO_CLEANUP_INTERVAL = 102; // in seconds
 
 	enum RouterStatus
 	{
@@ -90,7 +92,7 @@ namespace garlic
 				public:
 
 					RouterService (): RunnableServiceWithWork ("Router") {};
-					boost::asio::io_service& GetService () { return GetIOService (); };
+					auto& GetService () { return GetIOService (); };
 					void Start () { StartIOService (); };
 					void Stop () { StopIOService (); };
 			};
@@ -114,7 +116,8 @@ namespace garlic
 				return std::shared_ptr<i2p::garlic::GarlicDestination> (this,
 					[](i2p::garlic::GarlicDestination *) {});
 			}
-
+			std::shared_ptr<i2p::data::RouterInfo::Buffer> CopyRouterInfoBuffer () const;
+			
 			const uint8_t * GetNTCP2StaticPublicKey () const { return m_NTCP2Keys ? m_NTCP2Keys->staticPublicKey : nullptr; };
 			const uint8_t * GetNTCP2StaticPrivateKey () const { return m_NTCP2Keys ? m_NTCP2Keys->staticPrivateKey : nullptr; };
 			const uint8_t * GetNTCP2IV () const { return m_NTCP2Keys ? m_NTCP2Keys->iv : nullptr; };
@@ -145,7 +148,6 @@ namespace garlic
 			void SetNetID (int netID) { m_NetID = netID; };
 			bool DecryptTunnelBuildRecord (const uint8_t * encrypted, uint8_t * data);
 			bool DecryptTunnelShortRequestRecord (const uint8_t * encrypted, uint8_t * data);
-			void SubmitECIESx25519Key (const uint8_t * key, uint64_t tag);
 
 			void UpdatePort (int port); // called from Daemon
 			void UpdateAddress (const boost::asio::ip::address& host); // called from SSU2 or Daemon
@@ -153,6 +155,7 @@ namespace garlic
 			void PublishSSU2Address (int port, bool publish, bool v4, bool v6);
 			bool AddSSU2Introducer (const i2p::data::RouterInfo::Introducer& introducer, bool v4);
 			void RemoveSSU2Introducer (const i2p::data::IdentHash& h, bool v4);
+			void UpdateSSU2Introducer (const i2p::data::IdentHash& h, bool v4, uint32_t iTag, uint32_t iExp);
 			void ClearSSU2Introducers (bool v4);
 			bool IsUnreachable () const;
 			void SetUnreachable (bool v4, bool v6);
@@ -176,6 +179,7 @@ namespace garlic
 			void SetMTU (int mtu, bool v4);
 			void SetHidden(bool hide) { m_IsHiddenMode = hide; };
 			bool IsHidden() const { return m_IsHiddenMode; };
+			bool IsLimitedConnectivity () const { return m_Status == eRouterStatusProxy; }; // TODO: implement other cases
 			i2p::crypto::NoiseSymmetricState& GetCurrentNoiseState () { return m_CurrentNoiseState; };
 
 			void UpdateNTCP2V6Address (const boost::asio::ip::address& host); // called from Daemon. TODO: remove
@@ -183,24 +187,24 @@ namespace garlic
 			void UpdateTimestamp (uint64_t ts); // in seconds, called from NetDb before publishing
 
 			// implements LocalDestination
-			std::shared_ptr<const i2p::data::IdentityEx> GetIdentity () const { return m_Keys.GetPublic (); };
-			bool Decrypt (const uint8_t * encrypted, uint8_t * data, i2p::data::CryptoKeyType preferredCrypto) const;
-			void Sign (const uint8_t * buf, int len, uint8_t * signature) const { m_Keys.Sign (buf, len, signature); };
-			void SetLeaseSetUpdated () {};
+			std::shared_ptr<const i2p::data::IdentityEx> GetIdentity () const override{ return m_Keys.GetPublic (); };
+			bool Decrypt (const uint8_t * encrypted, uint8_t * data, i2p::data::CryptoKeyType preferredCrypto) const override;
+			void SetLeaseSetUpdated (bool post) override {};
 
 			// implements GarlicDestination
-			std::shared_ptr<const i2p::data::LocalLeaseSet> GetLeaseSet () { return nullptr; };
-			std::shared_ptr<i2p::tunnel::TunnelPool> GetTunnelPool () const;
+			std::shared_ptr<const i2p::data::LocalLeaseSet> GetLeaseSet () override { return nullptr; };
+			std::shared_ptr<i2p::tunnel::TunnelPool> GetTunnelPool () const override;
 
 			// override GarlicDestination
-			void ProcessGarlicMessage (std::shared_ptr<I2NPMessage> msg);
-			void ProcessDeliveryStatusMessage (std::shared_ptr<I2NPMessage> msg);
+			void ProcessGarlicMessage (std::shared_ptr<I2NPMessage> msg) override;
+			void ProcessDeliveryStatusMessage (std::shared_ptr<I2NPMessage> msg) override;
+			void SubmitECIESx25519Key (const uint8_t * key, uint64_t tag) override;
 
 		protected:
 
 			// implements GarlicDestination
-			void HandleI2NPMessage (const uint8_t * buf, size_t len);
-			bool HandleCloveI2NPMessage (I2NPMessageType typeID, const uint8_t * payload, size_t len, uint32_t msgID);
+			void HandleI2NPMessage (const uint8_t * buf, size_t len) override;
+			bool HandleCloveI2NPMessage (I2NPMessageType typeID, const uint8_t * payload, size_t len, uint32_t msgID) override;
 
 		private:
 
@@ -213,6 +217,7 @@ namespace garlic
 			void UpdateSSU2Keys ();
 			bool Load ();
 			void SaveKeys ();
+			void Sign (const uint8_t * buf, int len, uint8_t * signature) const { m_Keys.Sign (buf, len, signature); };
 			uint16_t SelectRandomPort () const;
 			void PublishNTCP2Address (std::shared_ptr<i2p::data::RouterInfo::Address> address, int port, bool publish) const;
 
@@ -229,6 +234,7 @@ namespace garlic
 			void HandlePublishResendTimer (const boost::system::error_code& ecode);
 			void ScheduleCongestionUpdate ();
 			void HandleCongestionUpdateTimer (const boost::system::error_code& ecode);
+			void UpdateCongestion ();
 			void ScheduleCleanupTimer ();
 			void HandleCleanupTimer (const boost::system::error_code& ecode);
 			
@@ -255,9 +261,14 @@ namespace garlic
 			// publish
 			std::unique_ptr<RouterService> m_Service;
 			std::unique_ptr<boost::asio::deadline_timer> m_PublishTimer, m_CongestionUpdateTimer, m_CleanupTimer;
-			std::set<i2p::data::IdentHash> m_PublishExcluded;
+			std::unordered_set<i2p::data::IdentHash> m_PublishExcluded;
 			uint32_t m_PublishReplyToken;
 			bool m_IsHiddenMode; // not publish
+			mutable std::mutex m_RouterInfoMutex;
+			std::mt19937 m_Rng;
+			std::shared_ptr<i2p::data::RouterInfo::Buffer> m_SaveBuffer;
+			std::mutex m_SaveBufferMutex; // TODO: make m_SaveBuffer atomic
+			std::atomic<bool> m_IsSaving;
 	};
 
 	extern RouterContext context;

libi2pd/RouterInfo.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -10,9 +10,10 @@
 #include <string.h>
 #include "I2PEndian.h"
 #include <fstream>
+#include <memory>
 #include <boost/lexical_cast.hpp>
-#include <boost/make_shared.hpp>
-#if (BOOST_VERSION >= 105300)
+#include <boost/algorithm/string.hpp> // for boost::to_lower
+#ifndef __cpp_lib_atomic_shared_ptr
 #include <boost/atomic.hpp>
 #endif
 #include "version.h"
@@ -39,27 +40,28 @@ namespace data
 
 	RouterInfo::RouterInfo (): m_Buffer (nullptr)
 	{
-		m_Addresses = boost::make_shared<Addresses>(); // create empty list
+		m_Addresses = AddressesPtr(new Addresses ()); // create empty list
 	}
 
 	RouterInfo::RouterInfo (const std::string& fullPath):
 		m_FamilyID (0), m_IsUpdated (false), m_IsUnreachable (false), m_IsFloodfill (false),
-		m_SupportedTransports (0),m_ReachableTransports (0), m_PublishedTransports (0),
-		m_Caps (0), m_Version (0), m_Congestion (eLowCongestion)
+		m_IsBufferScheduledToDelete (false), m_SupportedTransports (0), 
+		m_ReachableTransports (0), m_PublishedTransports (0), m_Caps (0), m_Version (0), 
+		m_Congestion (eLowCongestion)
 	{
-		m_Addresses = boost::make_shared<Addresses>(); // create empty list
-		m_Buffer = NewBuffer (); // always RouterInfo's
+		m_Addresses = AddressesPtr(new Addresses ()); // create empty list
+		m_Buffer = RouterInfo::NewBuffer (); // always RouterInfo's
 		ReadFromFile (fullPath);
 	}
 
 	RouterInfo::RouterInfo (std::shared_ptr<Buffer>&& buf, size_t len):
 		m_FamilyID (0), m_IsUpdated (true), m_IsUnreachable (false), m_IsFloodfill (false),
-		m_SupportedTransports (0), m_ReachableTransports (0), m_PublishedTransports (0),
+		m_IsBufferScheduledToDelete (false), m_SupportedTransports (0), m_ReachableTransports (0), m_PublishedTransports (0),
 		m_Caps (0), m_Version (0), m_Congestion (eLowCongestion)
 	{
 		if (len <= MAX_RI_BUFFER_SIZE)
 		{
-			m_Addresses = boost::make_shared<Addresses>(); // create empty list
+			m_Addresses = AddressesPtr(new Addresses ()); // create empty list
 			m_Buffer = buf;
 			if (m_Buffer) m_Buffer->SetBufferLen (len);
 			ReadFromBuffer (true);
@@ -73,7 +75,7 @@ namespace data
 	}
 
 	RouterInfo::RouterInfo (const uint8_t * buf, size_t len):
-		RouterInfo (std::make_shared<Buffer> (buf, len), len)
+		RouterInfo (netdb.NewRouterInfoBuffer (buf, len), len)
 	{
 	}
 
@@ -255,7 +257,7 @@ namespace data
 				if (!strcmp (key, "host"))
 				{
 					boost::system::error_code ecode;
-					address->host = boost::asio::ip::address::from_string (value, ecode);
+					address->host = boost::asio::ip::make_address (value, ecode);
 					if (!ecode && !address->host.is_unspecified ())
 					{
 						if (!i2p::transport::transports.IsInReservedRange (address->host) ||
@@ -438,10 +440,10 @@ namespace data
 		}
 		m_ReachableTransports |= m_PublishedTransports;
 		// update addresses
-#if (BOOST_VERSION >= 105300)
+#ifdef __cpp_lib_atomic_shared_ptr
+		m_Addresses = addresses;
+#else		
 		boost::atomic_store (&m_Addresses, addresses);
-#else
-		m_Addresses = addresses; // race condition
 #endif
 		// read peers
 		uint8_t numPeers;
@@ -484,6 +486,15 @@ namespace data
 					}
 					ch++;
 				}
+				if (m_Version < NETDB_MIN_PEER_TEST_VERSION && (m_SupportedTransports & (eSSU2V4 | eSSU2V6)))
+				{
+					auto addresses = GetAddresses ();
+					if (addresses)
+					{
+						if ((*addresses)[eSSU2V4Idx]) (*addresses)[eSSU2V4Idx]->caps &= ~eSSUTesting;
+						if ((*addresses)[eSSU2V6Idx]) (*addresses)[eSSU2V6Idx]->caps &= ~eSSUTesting;
+					}	
+				}	
 			}
 			// check netId
 			else if (!strcmp (key, ROUTER_INFO_PROPERTY_NETID))
@@ -534,13 +545,20 @@ namespace data
 				case CAPS_FLAG_FLOODFILL:
 					m_Caps |= Caps::eFloodfill;
 				break;
-				case CAPS_FLAG_HIGH_BANDWIDTH1:
-				case CAPS_FLAG_HIGH_BANDWIDTH2:
+				case CAPS_FLAG_LOW_BANDWIDTH1:
+				case CAPS_FLAG_LOW_BANDWIDTH2:
+				case CAPS_FLAG_LOW_BANDWIDTH3:
+				case CAPS_FLAG_LOW_BANDWIDTH4:
+					m_BandwidthCap = *cap;
+				break;
+				case CAPS_FLAG_HIGH_BANDWIDTH:
 					m_Caps |= Caps::eHighBandwidth;
+					m_BandwidthCap = *cap;
 				break;
 				case CAPS_FLAG_EXTRA_BANDWIDTH1:
 				case CAPS_FLAG_EXTRA_BANDWIDTH2:
 					m_Caps |= Caps::eExtraBandwidth | Caps::eHighBandwidth;
+					m_BandwidthCap = *cap;
 				break;
 				case CAPS_FLAG_HIDDEN:
 					m_Caps |= Caps::eHidden;
@@ -684,12 +702,12 @@ namespace data
 		if (addr->IsV4 ())
 		{
 			m_SupportedTransports |= eNTCP2V4;
-			(*m_Addresses)[eNTCP2V4Idx] = addr;
+			(*GetAddresses ())[eNTCP2V4Idx] = addr;
 		}
 		if (addr->IsV6 ())
 		{
 			m_SupportedTransports |= eNTCP2V6;
-			(*m_Addresses)[eNTCP2V6Idx] = addr;
+			(*GetAddresses ())[eNTCP2V6Idx] = addr;
 		}
 	}
 
@@ -710,11 +728,12 @@ namespace data
 			if (host.is_v4 ()) addr->caps |= eV4;
 			if (host.is_v6 ()) addr->caps |= eV6;
 		}	
+		auto addresses = GetAddresses ();
 		if (addr->IsV4 ())
 		{
 			m_SupportedTransports |= eNTCP2V4;
 			m_ReachableTransports |= eNTCP2V4;
-			(*m_Addresses)[eNTCP2V4Idx] = addr;
+			(*addresses)[eNTCP2V4Idx] = addr;
 		}
 		if (addr->IsV6 ())
 		{
@@ -722,30 +741,31 @@ namespace data
 			{
 				m_SupportedTransports |= eNTCP2V6Mesh;
 				m_ReachableTransports |= eNTCP2V6Mesh;
-				(*m_Addresses)[eNTCP2V6MeshIdx] = addr;
+				(*addresses)[eNTCP2V6MeshIdx] = addr;
 			}
 			else
 			{
 				m_SupportedTransports |= eNTCP2V6;
 				m_ReachableTransports |= eNTCP2V6;
-				(*m_Addresses)[eNTCP2V6Idx] = addr;
+				(*addresses)[eNTCP2V6Idx] = addr;
 			}
 		}
 	}
 
 	void RouterInfo::RemoveNTCP2Address (bool v4)
 	{
+		auto addresses = GetAddresses ();
 		if (v4)
 		{
-			if ((*m_Addresses)[eNTCP2V6Idx])
-				(*m_Addresses)[eNTCP2V6Idx]->caps &= ~AddressCaps::eV4;
-			(*m_Addresses)[eNTCP2V4Idx].reset ();
+			if ((*addresses)[eNTCP2V6Idx])
+				(*addresses)[eNTCP2V6Idx]->caps &= ~AddressCaps::eV4;
+			(*addresses)[eNTCP2V4Idx].reset ();
 		}
 		else
 		{
-			if ((*m_Addresses)[eNTCP2V4Idx])
-				(*m_Addresses)[eNTCP2V4Idx]->caps &= ~AddressCaps::eV6;
-			(*m_Addresses)[eNTCP2V6Idx].reset ();
+			if ((*addresses)[eNTCP2V4Idx])
+				(*addresses)[eNTCP2V4Idx]->caps &= ~AddressCaps::eV6;
+			(*addresses)[eNTCP2V6Idx].reset ();
 		}
 		UpdateSupportedTransports ();
 	}
@@ -761,15 +781,16 @@ namespace data
 		addr->ssu->mtu = 0;
 		memcpy (addr->s, staticKey, 32);
 		memcpy (addr->i, introKey, 32);
+		auto addresses = GetAddresses ();
 		if (addr->IsV4 ())
 		{
 			m_SupportedTransports |= eSSU2V4;
-			(*m_Addresses)[eSSU2V4Idx] = addr;
+			(*addresses)[eSSU2V4Idx] = addr;
 		}
 		if (addr->IsV6 ())
 		{
 			m_SupportedTransports |= eSSU2V6;
-			(*m_Addresses)[eSSU2V6Idx] = addr;
+			(*addresses)[eSSU2V6Idx] = addr;
 		}
 	}
 
@@ -794,33 +815,35 @@ namespace data
 			if (host.is_v4 ()) addr->caps |= eV4;
 			if (host.is_v6 ()) addr->caps |= eV6;
 		}
+		auto addresses = GetAddresses ();
 		if (addr->IsV4 ())
 		{
 			m_SupportedTransports |= eSSU2V4;
 			m_ReachableTransports |= eSSU2V4;
-			(*m_Addresses)[eSSU2V4Idx] = addr;
+			(*addresses)[eSSU2V4Idx] = addr;
 		}
 		if (addr->IsV6 ())
 		{
 			m_SupportedTransports |= eSSU2V6;
 			m_ReachableTransports |= eSSU2V6;
-			(*m_Addresses)[eSSU2V6Idx] = addr;
+			(*addresses)[eSSU2V6Idx] = addr;
 		}
 	}
 
 	void RouterInfo::RemoveSSU2Address (bool v4)
 	{
+		auto addresses = GetAddresses ();
 		if (v4)
 		{
-			if ((*m_Addresses)[eSSU2V6Idx])
-				(*m_Addresses)[eSSU2V6Idx]->caps &= ~AddressCaps::eV4;
-			(*m_Addresses)[eSSU2V4Idx].reset ();
+			if ((*addresses)[eSSU2V6Idx])
+				(*addresses)[eSSU2V6Idx]->caps &= ~AddressCaps::eV4;
+			(*addresses)[eSSU2V4Idx].reset ();
 		}
 		else
 		{
-			if ((*m_Addresses)[eSSU2V4Idx])
-				(*m_Addresses)[eSSU2V4Idx]->caps &= ~AddressCaps::eV6;
-			(*m_Addresses)[eSSU2V6Idx].reset ();
+			if ((*addresses)[eSSU2V4Idx])
+				(*addresses)[eSSU2V4Idx]->caps &= ~AddressCaps::eV6;
+			(*addresses)[eSSU2V6Idx].reset ();
 		}
 		UpdateSupportedTransports ();
 	}
@@ -861,17 +884,18 @@ namespace data
 	{
 		if (IsV6 ())
 		{
-			if ((*m_Addresses)[eNTCP2V6Idx])
+			auto addresses = GetAddresses ();
+			if ((*addresses)[eNTCP2V6Idx])
 			{
-				if ((*m_Addresses)[eNTCP2V6Idx]->IsV4 () && (*m_Addresses)[eNTCP2V4Idx])
-					(*m_Addresses)[eNTCP2V4Idx]->caps &= ~AddressCaps::eV6;
-				(*m_Addresses)[eNTCP2V6Idx].reset ();
+				if ((*addresses)[eNTCP2V6Idx]->IsV4 () && (*addresses)[eNTCP2V4Idx])
+					(*addresses)[eNTCP2V4Idx]->caps &= ~AddressCaps::eV6;
+				(*addresses)[eNTCP2V6Idx].reset ();
 			}
-			if ((*m_Addresses)[eSSU2V6Idx])
+			if ((*addresses)[eSSU2V6Idx])
 			{
-				if ((*m_Addresses)[eSSU2V6Idx]->IsV4 () && (*m_Addresses)[eSSU2V4Idx])
-					(*m_Addresses)[eSSU2V4Idx]->caps &= ~AddressCaps::eV6;
-				(*m_Addresses)[eSSU2V6Idx].reset ();
+				if ((*addresses)[eSSU2V6Idx]->IsV4 () && (*addresses)[eSSU2V4Idx])
+					(*addresses)[eSSU2V4Idx]->caps &= ~AddressCaps::eV6;
+				(*addresses)[eSSU2V6Idx].reset ();
 			}
 			UpdateSupportedTransports ();
 		}
@@ -881,17 +905,18 @@ namespace data
 	{
 		if (IsV4 ())
 		{
-			if ((*m_Addresses)[eNTCP2V4Idx])
+			auto addresses = GetAddresses ();
+			if ((*addresses)[eNTCP2V4Idx])
 			{
-				if ((*m_Addresses)[eNTCP2V4Idx]->IsV6 () && (*m_Addresses)[eNTCP2V6Idx])
-					(*m_Addresses)[eNTCP2V6Idx]->caps &= ~AddressCaps::eV4;
-				(*m_Addresses)[eNTCP2V4Idx].reset ();
+				if ((*addresses)[eNTCP2V4Idx]->IsV6 () && (*addresses)[eNTCP2V6Idx])
+					(*addresses)[eNTCP2V6Idx]->caps &= ~AddressCaps::eV4;
+				(*addresses)[eNTCP2V4Idx].reset ();
 			}
-			if ((*m_Addresses)[eSSU2V4Idx])
+			if ((*addresses)[eSSU2V4Idx])
 			{
-				if ((*m_Addresses)[eSSU2V4Idx]->IsV6 () && (*m_Addresses)[eSSU2V6Idx])
-					(*m_Addresses)[eSSU2V6Idx]->caps &= ~AddressCaps::eV4;
-				(*m_Addresses)[eSSU2V4Idx].reset ();
+				if ((*addresses)[eSSU2V4Idx]->IsV6 () && (*addresses)[eSSU2V6Idx])
+					(*addresses)[eSSU2V6Idx]->caps &= ~AddressCaps::eV4;
+				(*addresses)[eSSU2V4Idx].reset ();
 			}
 			UpdateSupportedTransports ();
 		}
@@ -912,7 +937,7 @@ namespace data
 		{
 			m_SupportedTransports &= ~eNTCP2V6Mesh;
 			m_ReachableTransports &= ~eNTCP2V6Mesh;
-			(*m_Addresses)[eNTCP2V6MeshIdx].reset ();
+			(*GetAddresses ())[eNTCP2V6MeshIdx].reset ();
 		}
 	}
 
@@ -941,12 +966,12 @@ namespace data
 		return nullptr;
 	}
 
-	boost::shared_ptr<RouterInfo::Addresses> RouterInfo::GetAddresses () const
+	RouterInfo::AddressesPtr RouterInfo::GetAddresses () const
 	{
-#if (BOOST_VERSION >= 105300)
-		return boost::atomic_load (&m_Addresses);
-#else
+#ifdef __cpp_lib_atomic_shared_ptr
 		return m_Addresses;
+#else		
+		return boost::atomic_load (&m_Addresses);
 #endif
 	}
 
@@ -954,10 +979,10 @@ namespace data
 	std::shared_ptr<const RouterInfo::Address> RouterInfo::GetAddress (Filter filter) const
 	{
 		// TODO: make it more generic using comparator
-#if (BOOST_VERSION >= 105300)
+#ifdef __cpp_lib_atomic_shared_ptr
+		AddressesPtr addresses = m_Addresses;
+#else		
 		auto addresses = boost::atomic_load (&m_Addresses);
-#else
-		auto addresses = m_Addresses;
 #endif
 		for (const auto& address : *addresses)
 			if (address && filter (address)) return address;
@@ -1014,17 +1039,24 @@ namespace data
 
 	bool RouterInfo::IsEligibleFloodfill () const
 	{
-		// floodfill must have published ipv4, >= 0.9.38 and not DSA
-		return m_Version >= NETDB_MIN_FLOODFILL_VERSION && IsPublished (true) && 
+		// floodfill must have published ipv4 or reachable ipv4 and published ipv6
+		// >= 0.9.59 and not DSA
+		return m_Version >= NETDB_MIN_FLOODFILL_VERSION && (IsPublished (true) ||
+			(IsReachableBy (eNTCP2V4 | eSSU2V4) && IsPublished (false))) &&
 			GetIdentity ()->GetSigningKeyType () != SIGNING_KEY_TYPE_DSA_SHA1;
 	}
 
 	bool RouterInfo::IsPublished (bool v4) const
 	{
 		if (m_Caps & (eUnreachable | eHidden)) return false; // if router sets U or H we assume that all addresses are not published
-		return m_PublishedTransports & (v4 ? (eNTCP2V4 | eSSU2V4) : (eNTCP2V6 | eSSU2V6));
+		return IsPublishedOn (v4 ? (eNTCP2V4 | eSSU2V4) : (eNTCP2V6 | eSSU2V6));
 	}	
 
+	bool RouterInfo::IsPublishedOn (CompatibleTransports transports) const
+	{
+		return m_PublishedTransports & transports;
+	}
+	
 	bool RouterInfo::IsNAT2NATOnly (const RouterInfo& other) const
 	{
 		return !(m_PublishedTransports & other.m_SupportedTransports) &&
@@ -1047,7 +1079,7 @@ namespace data
 
 	void RouterInfo::SetUnreachableAddressesTransportCaps (uint8_t transports)
 	{
-		for (auto& addr: *m_Addresses)
+		for (auto& addr: *GetAddresses ())
 		{
 			if (addr && !addr->published)
 			{
@@ -1061,7 +1093,7 @@ namespace data
 	{
 		m_SupportedTransports = 0;
 		m_ReachableTransports = 0;
-		for (const auto& addr: *m_Addresses)
+		for (const auto& addr: *GetAddresses ())
 		{
 			if (!addr) continue;
 			uint8_t transports = 0;
@@ -1113,6 +1145,7 @@ namespace data
 		
 	void RouterInfo::UpdateBuffer (const uint8_t * buf, size_t len)
 	{
+		m_IsBufferScheduledToDelete = false;
 		if (!m_Buffer)
 			m_Buffer = NewBuffer ();
 		if (len > m_Buffer->size ()) len = m_Buffer->size ();
@@ -1120,6 +1153,12 @@ namespace data
 		m_Buffer->SetBufferLen (len);
 	}
 
+	std::shared_ptr<RouterInfo::Buffer> RouterInfo::CopyBuffer () const
+	{
+		if (!m_Buffer) return nullptr;
+		return netdb.NewRouterInfoBuffer (*m_Buffer);
+	}	
+		
 	std::shared_ptr<RouterInfo::Buffer> RouterInfo::NewBuffer () const
 	{
 		return netdb.NewRouterInfoBuffer ();
@@ -1130,7 +1169,7 @@ namespace data
 		return netdb.NewRouterInfoAddress ();
 	}
 
-	boost::shared_ptr<RouterInfo::Addresses> RouterInfo::NewAddresses () const
+	RouterInfo::AddressesPtr RouterInfo::NewAddresses () const
 	{
 		return netdb.NewRouterInfoAddresses ();
 	}
@@ -1165,6 +1204,19 @@ namespace data
 				return false;
 		}
 	}
+
+	std::string RouterInfo::GetTransportName (SupportedTransports tr)
+	{
+		switch (tr)
+		{
+			case eNTCP2V4: return "NTCP2V4";
+			case eNTCP2V6: return "NTCP2V6";
+			case eSSU2V4: return "SSU2V4";
+			case eSSU2V6: return "SSU2V6";
+			case eNTCP2V6Mesh: return "Mesh";
+			default: return "";
+		}
+	}	
 		
 	void LocalRouterInfo::CreateBuffer (const PrivateKeys& privateKeys)
 	{
@@ -1203,7 +1255,7 @@ namespace data
 				CAPS_FLAG_EXTRA_BANDWIDTH2 : // 'X'
 				CAPS_FLAG_EXTRA_BANDWIDTH1; // 'P'
 			else
-				caps += CAPS_FLAG_HIGH_BANDWIDTH2; // 'O'
+				caps += CAPS_FLAG_HIGH_BANDWIDTH; // 'O'
 			caps += CAPS_FLAG_FLOODFILL; // floodfill
 		}
 		else
@@ -1211,7 +1263,7 @@ namespace data
 			if (c & eExtraBandwidth)
 				caps += (c & eHighBandwidth) ? CAPS_FLAG_EXTRA_BANDWIDTH2 /* 'X' */ : CAPS_FLAG_EXTRA_BANDWIDTH1; /*'P' */
 			else
-				caps += (c & eHighBandwidth) ? CAPS_FLAG_HIGH_BANDWIDTH2 /* 'O' */: CAPS_FLAG_LOW_BANDWIDTH2 /* 'L' */; // bandwidth
+				caps += (c & eHighBandwidth) ? CAPS_FLAG_HIGH_BANDWIDTH /* 'O' */: CAPS_FLAG_LOW_BANDWIDTH2 /* 'L' */; // bandwidth
 		}
 		if (c & eHidden) caps += CAPS_FLAG_HIDDEN; // hidden
 		if (c & eReachable) caps += CAPS_FLAG_REACHABLE; // reachable
@@ -1482,9 +1534,9 @@ namespace data
 		return std::make_shared<Address> ();
 	}
 
-	boost::shared_ptr<RouterInfo::Addresses> LocalRouterInfo::NewAddresses () const
+	RouterInfo::AddressesPtr LocalRouterInfo::NewAddresses () const
 	{
-		return boost::make_shared<Addresses> ();
+		return RouterInfo::AddressesPtr(new RouterInfo::Addresses ());
 	}
 
 	std::shared_ptr<IdentityEx> LocalRouterInfo::NewIdentity (const uint8_t * buf, size_t len) const
@@ -1526,5 +1578,23 @@ namespace data
 		}
 		return false;
 	}
+
+	bool LocalRouterInfo::UpdateSSU2Introducer (const IdentHash& h, bool v4, uint32_t iTag, uint32_t iExp)
+	{
+		auto addresses = GetAddresses ();
+		if (!addresses) return false;
+		auto addr = (*addresses)[v4 ? eSSU2V4Idx : eSSU2V6Idx];
+		if (addr)
+		{
+			for (auto& it: addr->ssu->introducers)
+				if (h == it.iH)
+				{
+					it.iTag = iTag;
+					it.iExp = iExp;
+					return true;
+				}	
+		}
+		return false;
+	}	
 }
 }

libi2pd/RouterInfo.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -15,8 +15,11 @@
 #include <vector>
 #include <array>
 #include <iostream>
+#include <memory>
 #include <boost/asio.hpp>
+#ifndef __cpp_lib_atomic_shared_ptr
 #include <boost/shared_ptr.hpp>
+#endif
 #include "Identity.h"
 #include "Profiling.h"
 #include "Family.h"
@@ -40,8 +43,8 @@ namespace data
 	const char CAPS_FLAG_LOW_BANDWIDTH1   = 'K'; /*   < 12 KBps */
 	const char CAPS_FLAG_LOW_BANDWIDTH2   = 'L'; /*  12-48 KBps */
 	const char CAPS_FLAG_LOW_BANDWIDTH3  = 'M'; /*  48-64 KBps */
-	const char CAPS_FLAG_HIGH_BANDWIDTH1  = 'N'; /*  64-128 KBps */
-	const char CAPS_FLAG_HIGH_BANDWIDTH2  = 'O'; /* 128-256 KBps */
+	const char CAPS_FLAG_LOW_BANDWIDTH4  = 'N'; /*  64-128 KBps */
+	const char CAPS_FLAG_HIGH_BANDWIDTH  = 'O'; /* 128-256 KBps */
 	const char CAPS_FLAG_EXTRA_BANDWIDTH1 = 'P'; /* 256-2048 KBps */
 	const char CAPS_FLAG_EXTRA_BANDWIDTH2 = 'X'; /*   > 2048 KBps */
 	// bandwidth limits in kBps
@@ -188,6 +191,7 @@ namespace data
 
 					Buffer () = default;
 					Buffer (const uint8_t * buf, size_t len);
+					Buffer (const Buffer& other): Buffer (other.data (), other.m_BufferLen) {};
 
 					size_t GetBufferLen () const { return m_BufferLen; };
 					void SetBufferLen (size_t len) { m_BufferLen = len; };
@@ -198,7 +202,11 @@ namespace data
 			};
 
 			typedef std::array<std::shared_ptr<Address>, eNumTransports> Addresses;
-
+#ifdef __cpp_lib_atomic_shared_ptr
+			typedef std::shared_ptr<Addresses> AddressesPtr;
+#else
+			typedef boost::shared_ptr<Addresses> AddressesPtr;
+#endif			
 			RouterInfo (const std::string& fullPath);
 			RouterInfo (const RouterInfo& ) = default;
 			RouterInfo& operator=(const RouterInfo& ) = default;
@@ -213,7 +221,7 @@ namespace data
 			int GetVersion () const { return m_Version; };
 			virtual void SetProperty (const std::string& key, const std::string& value) {};
 			virtual void ClearProperties () {};
-			boost::shared_ptr<Addresses> GetAddresses () const; // should be called for local RI only, otherwise must return shared_ptr
+			AddressesPtr GetAddresses () const; // should be called for local RI only, otherwise must return shared_ptr
 			std::shared_ptr<const Address> GetNTCP2V4Address () const;
 			std::shared_ptr<const Address> GetNTCP2V6Address () const;
 			std::shared_ptr<const Address> GetPublishedNTCP2V4Address () const;
@@ -263,12 +271,14 @@ namespace data
 			bool IsEligibleFloodfill () const;
 			bool IsDeclaredFloodfill () const { return m_Caps & RouterInfo::eFloodfill; };
 			bool IsPublished (bool v4) const;
+			bool IsPublishedOn (CompatibleTransports transports) const;
 			bool IsNAT2NATOnly (const RouterInfo& other) const; // only NAT-to-NAT connection is possible
 			bool IsSSU2PeerTesting (bool v4) const;
 			bool IsSSU2Introducer (bool v4) const;
 			bool IsHighCongestion (bool highBandwidth) const;
 
 			uint8_t GetCaps () const { return m_Caps; };
+			char GetBandwidthCap() const { return m_BandwidthCap; };
 			void SetCaps (uint8_t caps) { m_Caps = caps; };
 
 			Congestion GetCongestion () const { return m_Congestion; };
@@ -280,8 +290,12 @@ namespace data
 			const uint8_t * GetBuffer () const { return m_Buffer ? m_Buffer->data () : nullptr; };
 			const uint8_t * LoadBuffer (const std::string& fullPath); // load if necessary
 			size_t GetBufferLen () const { return m_Buffer ? m_Buffer->GetBufferLen () : 0; };
-			void DeleteBuffer () { m_Buffer = nullptr; };
-			std::shared_ptr<Buffer> GetSharedBuffer () const { return m_Buffer; };			
+			void DeleteBuffer () { m_Buffer = nullptr; m_IsBufferScheduledToDelete = false; };
+			std::shared_ptr<Buffer> GetSharedBuffer () const { return m_Buffer; };	
+			std::shared_ptr<Buffer> CopyBuffer () const;
+			void ScheduleBufferToDelete () { m_IsBufferScheduledToDelete = true; };
+			void CancelBufferToDelete () { m_IsBufferScheduledToDelete = false; };
+			bool IsBufferScheduledToDelete () const { return m_IsBufferScheduledToDelete; };
 
 			bool IsUpdated () const { return m_IsUpdated; };
 			void SetUpdated (bool updated) { m_IsUpdated = updated; };
@@ -329,7 +343,7 @@ namespace data
 			std::shared_ptr<const Address> GetAddress (Filter filter) const;
 			virtual std::shared_ptr<Buffer> NewBuffer () const;
 			virtual std::shared_ptr<Address> NewAddress () const;
-			virtual boost::shared_ptr<Addresses> NewAddresses () const;
+			virtual AddressesPtr NewAddresses () const;
 			virtual std::shared_ptr<IdentityEx> NewIdentity (const uint8_t * buf, size_t len) const;
 
 		private:
@@ -338,13 +352,22 @@ namespace data
 			std::shared_ptr<const IdentityEx> m_RouterIdentity;
 			std::shared_ptr<Buffer> m_Buffer;
 			uint64_t m_Timestamp; // in milliseconds
-			boost::shared_ptr<Addresses> m_Addresses; // TODO: use std::shared_ptr and std::atomic_store for gcc >= 4.9
-			bool m_IsUpdated, m_IsUnreachable, m_IsFloodfill;
+#ifdef __cpp_lib_atomic_shared_ptr
+			std::atomic<AddressesPtr> m_Addresses;
+#else		
+			AddressesPtr m_Addresses;
+#endif		
+			bool m_IsUpdated, m_IsUnreachable, m_IsFloodfill, m_IsBufferScheduledToDelete;
 			CompatibleTransports m_SupportedTransports, m_ReachableTransports, m_PublishedTransports;
 			uint8_t m_Caps;
+			char m_BandwidthCap;
 			int m_Version;
 			Congestion m_Congestion;
 			mutable std::shared_ptr<RouterProfile> m_Profile;
+
+		public:
+
+			static std::string GetTransportName (SupportedTransports tr);
 	};
 
 	class LocalRouterInfo: public RouterInfo
@@ -364,6 +387,7 @@ namespace data
 			
 			bool AddSSU2Introducer (const Introducer& introducer, bool v4);
 			bool RemoveSSU2Introducer (const IdentHash& h, bool v4);
+			bool UpdateSSU2Introducer (const IdentHash& h, bool v4, uint32_t iTag, uint32_t iExp);
 
 		private:
 
@@ -372,7 +396,7 @@ namespace data
 			void WriteString (const std::string& str, std::ostream& s) const;
 			std::shared_ptr<Buffer> NewBuffer () const override;
 			std::shared_ptr<Address> NewAddress () const override;
-			boost::shared_ptr<Addresses> NewAddresses () const override;
+			RouterInfo::AddressesPtr NewAddresses () const override;
 			std::shared_ptr<IdentityEx> NewIdentity (const uint8_t * buf, size_t len) const override;
 
 		private:

libi2pd/SSU2.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2022-2024, The PurpleI2P Project
+* Copyright (c) 2022-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -10,30 +10,42 @@
 #define SSU2_H__
 
 #include <unordered_map>
+#include <unordered_set>
+#include <vector>
+#include <list>
+#include <array>
 #include <mutex>
+#include <random>
 #include "util.h"
 #include "SSU2Session.h"
+#include "SSU2OutOfSession.h"
 #include "Socks5.h"
 
 namespace i2p
 {
 namespace transport
 {
-	const int SSU2_TERMINATION_CHECK_TIMEOUT = 25; // in seconds
+	const int SSU2_TERMINATION_CHECK_TIMEOUT = 23; // in seconds
+	const int SSU2_TERMINATION_CHECK_TIMEOUT_VARIANCE = 5; // in seconds
 	const int SSU2_CLEANUP_INTERVAL = 72; // in seconds
 	const int SSU2_RESEND_CHECK_TIMEOUT = 40; // in milliseconds
 	const int SSU2_RESEND_CHECK_TIMEOUT_VARIANCE = 10; // in milliseconds
-	const int SSU2_RESEND_CHECK_MORE_TIMEOUT = 10; // in milliseconds
+	const int SSU2_RESEND_CHECK_MORE_TIMEOUT = 4; // in milliseconds
+	const int SSU2_RESEND_CHECK_MORE_TIMEOUT_VARIANCE = 9; // in milliseconds
 	const size_t SSU2_MAX_RESEND_PACKETS = 128; // packets to resend at the time
 	const uint64_t SSU2_SOCKET_MIN_BUFFER_SIZE = 128 * 1024;
 	const uint64_t SSU2_SOCKET_MAX_BUFFER_SIZE = 4 * 1024 * 1024;
 	const size_t SSU2_MAX_NUM_INTRODUCERS = 3;
 	const size_t SSU2_MIN_RECEIVED_PACKET_SIZE = 40; // 16 byte short header + 8 byte minimum payload + 16 byte MAC
+	const size_t SSU2_MAX_RECEIVED_QUEUE_SIZE = 2500; // in packets
 	const int SSU2_TO_INTRODUCER_SESSION_DURATION = 3600; // 1 hour
 	const int SSU2_TO_INTRODUCER_SESSION_EXPIRATION = 4800; // 80 minutes
 	const int SSU2_KEEP_ALIVE_INTERVAL = 15; // in seconds
 	const int SSU2_KEEP_ALIVE_INTERVAL_VARIANCE = 4; // in seconds
 	const int SSU2_PROXY_CONNECT_RETRY_TIMEOUT = 30; // in seconds
+	const int SSU2_MIN_HOLE_PUNCH_EXPIRATION = 30; // in seconds
+	const int SSU2_MAX_HOLE_PUNCH_EXPIRATION = 160; // in seconds
+	const size_t SSU2_MAX_NUM_PACKETS_PER_BATCH = 64;
 
 	class SSU2Server: private i2p::util::RunnableServiceWithWork
 	{
@@ -43,13 +55,13 @@ namespace transport
 			size_t len;
 			boost::asio::ip::udp::endpoint from;
 		};
-
+	
 		class ReceiveService: public i2p::util::RunnableService
 		{
 			public:
 
 				ReceiveService (const std::string& name): RunnableService (name) {};
-				boost::asio::io_service& GetService () { return GetIOService (); };
+				auto& GetService () { return GetIOService (); };
 				void Start () { StartIOService (); };
 				void Stop () { StopIOService (); };
 		};
@@ -61,29 +73,45 @@ namespace transport
 
 			void Start ();
 			void Stop ();
-			boost::asio::io_service& GetService () { return GetIOService (); };
+			auto& GetService () { return GetIOService (); };
 			void SetLocalAddress (const boost::asio::ip::address& localAddress);
 			bool SetProxy (const std::string& address, uint16_t port);
 			bool UsesProxy () const { return m_IsThroughProxy; };
 			bool IsSupported (const boost::asio::ip::address& addr) const;
 			uint16_t GetPort (bool v4) const;
+			bool IsConnectedRecently (const boost::asio::ip::udp::endpoint& ep, bool max = true);
+			void AddConnectedRecently (const boost::asio::ip::udp::endpoint& ep, uint64_t ts);
+			std::mt19937& GetRng () { return m_Rng; }
+			bool AEADChaCha20Poly1305Encrypt (const uint8_t * msg, size_t msgLen, const uint8_t * ad, size_t adLen,
+				const uint8_t * key, const uint8_t * nonce, uint8_t * buf, size_t len); 
+			bool AEADChaCha20Poly1305Decrypt (const uint8_t * msg, size_t msgLen, const uint8_t * ad, size_t adLen,
+				const uint8_t * key, const uint8_t * nonce, uint8_t * buf, size_t len); 
+			void ChaCha20 (const uint8_t * msg, size_t msgLen, const uint8_t * key, const uint8_t * nonce, uint8_t * out);
+			bool IsMaxNumIntroducers (bool v4) const { return (v4 ? m_Introducers.size () : m_IntroducersV6.size ()) >= SSU2_MAX_NUM_INTRODUCERS; }
 			bool IsSyncClockFromPeers () const { return m_IsSyncClockFromPeers; };
 			void AdjustTimeOffset (int64_t offset, std::shared_ptr<const i2p::data::IdentityEx> from);
 
-			void AddSession (std::shared_ptr<SSU2Session> session);
+			bool AddSession (std::shared_ptr<SSU2Session> session);
 			void RemoveSession (uint64_t connID);
+			void RequestRemoveSession (uint64_t connID);
 			void AddSessionByRouterHash (std::shared_ptr<SSU2Session> session);
 			bool AddPendingOutgoingSession (std::shared_ptr<SSU2Session> session);
 			void RemovePendingOutgoingSession (const boost::asio::ip::udp::endpoint& ep);
-			std::shared_ptr<SSU2Session> FindSession (const i2p::data::IdentHash& ident) const;
+			std::shared_ptr<SSU2Session> FindSession (const i2p::data::IdentHash& ident);
 			std::shared_ptr<SSU2Session> FindPendingOutgoingSession (const boost::asio::ip::udp::endpoint& ep) const;
 			std::shared_ptr<SSU2Session> GetRandomPeerTestSession (i2p::data::RouterInfo::CompatibleTransports remoteTransports,
-				const i2p::data::IdentHash& excluded) const;
+				const i2p::data::IdentHash& excluded);
 
 			void AddRelay (uint32_t tag, std::shared_ptr<SSU2Session> relay);
 			void RemoveRelay (uint32_t tag);
 			std::shared_ptr<SSU2Session> FindRelaySession (uint32_t tag);
 
+			bool AddPeerTest (uint32_t nonce, std::shared_ptr<SSU2Session> aliceSession, uint64_t ts); 
+			std::shared_ptr<SSU2Session> GetPeerTest (uint32_t nonce);	
+		
+			bool AddRequestedPeerTest (uint32_t nonce, std::shared_ptr<SSU2PeerTestSession> session, uint64_t ts);
+			std::shared_ptr<SSU2PeerTestSession> GetRequestedPeerTest (uint32_t nonce);		
+		
 			void Send (const uint8_t * header, size_t headerLen, const uint8_t * payload, size_t payloadLen,
 				const boost::asio::ip::udp::endpoint& to);
 			void Send (const uint8_t * header, size_t headerLen, const uint8_t * headerX, size_t headerXLen,
@@ -111,10 +139,12 @@ namespace transport
 			void Receive (boost::asio::ip::udp::socket& socket);
 			void HandleReceivedFrom (const boost::system::error_code& ecode, size_t bytes_transferred,
 				Packet * packet, boost::asio::ip::udp::socket& socket);
-			void HandleReceivedPacket (Packet * packet);
-			void HandleReceivedPackets (std::vector<Packet *> packets);
+			void HandleReceivedPackets (std::list<Packet *>&& packets);
 			void ProcessNextPacket (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& senderEndpoint);
-
+			void InsertToReceivedPacketsQueue (Packet * packet);
+			void InsertToReceivedPacketsQueue (std::list<Packet *>& packets);
+			void HandleReceivedPacketsQueue ();
+		
 			void ScheduleTermination ();
 			void HandleTerminationTimer (const boost::system::error_code& ecode);
 
@@ -124,9 +154,10 @@ namespace transport
 			void ScheduleResend (bool more);
 			void HandleResendTimer (const boost::system::error_code& ecode);
 
+			bool CheckPendingOutgoingSession (const boost::asio::ip::udp::endpoint& ep, bool peerTest);
 			void ConnectThroughIntroducer (std::shared_ptr<SSU2Session> session);
-			std::list<std::shared_ptr<SSU2Session> > FindIntroducers (int maxNumIntroducers,
-				bool v4, const std::set<i2p::data::IdentHash>& excluded) const;
+			std::vector<std::shared_ptr<SSU2Session> > FindIntroducers (int maxNumIntroducers,
+				bool v4, const std::unordered_set<i2p::data::IdentHash>& excluded);
 			void UpdateIntroducers (bool v4);
 			void ScheduleIntroducersUpdateTimer ();
 			void HandleIntroducersUpdateTimer (const boost::system::error_code& ecode, bool v4);
@@ -149,12 +180,14 @@ namespace transport
 			boost::asio::ip::udp::socket m_SocketV4, m_SocketV6;
 			boost::asio::ip::address m_AddressV4, m_AddressV6;
 			std::unordered_map<uint64_t, std::shared_ptr<SSU2Session> > m_Sessions;
-			std::unordered_map<i2p::data::IdentHash, std::shared_ptr<SSU2Session> > m_SessionsByRouterHash;
+			std::unordered_map<i2p::data::IdentHash, std::weak_ptr<SSU2Session> > m_SessionsByRouterHash;
+			mutable std::mutex m_SessionsByRouterHashMutex;
 			std::map<boost::asio::ip::udp::endpoint, std::shared_ptr<SSU2Session> > m_PendingOutgoingSessions;
 			mutable std::mutex m_PendingOutgoingSessionsMutex;
 			std::map<boost::asio::ip::udp::endpoint, std::pair<uint64_t, uint32_t> > m_IncomingTokens, m_OutgoingTokens; // remote endpoint -> (token, expires in seconds)
-			std::map<uint32_t, std::shared_ptr<SSU2Session> > m_Relays; // we are introducer, relay tag -> session
-			std::list<i2p::data::IdentHash> m_Introducers, m_IntroducersV6; // introducers we are connected to
+			std::unordered_map<uint32_t, std::weak_ptr<SSU2Session> > m_Relays; // we are introducer, relay tag -> session
+			std::unordered_map<uint32_t, std::pair <std::weak_ptr<SSU2Session>, uint64_t > > m_PeerTests; // nonce->(Alice, timestamp). We are Bob
+			std::list<std::pair<i2p::data::IdentHash, uint32_t> > m_Introducers, m_IntroducersV6; // introducers we are connected to
 			i2p::util::MemoryPoolMt<Packet> m_PacketsPool;
 			i2p::util::MemoryPool<SSU2SentPacket> m_SentPacketsPool;
 			i2p::util::MemoryPool<SSU2IncompleteMessage> m_IncompleteMessagesPool;
@@ -166,7 +199,16 @@ namespace transport
 			bool m_IsSyncClockFromPeers;
 			int64_t m_PendingTimeOffset; // during peer test
 			std::shared_ptr<const i2p::data::IdentityEx> m_PendingTimeOffsetFrom;
-
+			std::mt19937 m_Rng;
+			std::map<boost::asio::ip::udp::endpoint, uint64_t> m_ConnectedRecently; // endpoint -> last activity time in seconds
+			mutable std::mutex m_ConnectedRecentlyMutex;
+			std::unordered_map<uint32_t, std::pair <std::weak_ptr<SSU2PeerTestSession>, uint64_t > > m_RequestedPeerTests; // nonce->(Alice, timestamp) 
+			std::list<Packet *> m_ReceivedPacketsQueue;
+			mutable std::mutex m_ReceivedPacketsQueueMutex;
+			i2p::crypto::AEADChaCha20Poly1305Encryptor m_Encryptor;
+			i2p::crypto::AEADChaCha20Poly1305Decryptor m_Decryptor;
+			i2p::crypto::ChaCha20Context m_ChaCha20;
+		
 			// proxy
 			bool m_IsThroughProxy;
 			uint8_t m_UDPRequestHeader[SOCKS5_UDP_IPV6_REQUEST_HEADER_SIZE];

libi2pd/SSU2OutOfSession.cpp

@@ -0,0 +1,355 @@
+/*
+* Copyright (c) 2024-2025, The PurpleI2P Project
+*
+* This file is part of Purple i2pd project and licensed under BSD3
+*
+* See full license text in LICENSE file at top of project tree
+*/
+
+#include "Log.h"
+#include "SSU2.h"
+#include "SSU2OutOfSession.h"
+
+namespace i2p
+{
+namespace transport
+{
+	SSU2PeerTestSession::SSU2PeerTestSession (SSU2Server& server, uint64_t sourceConnID, uint64_t destConnID): 
+		SSU2Session (server, nullptr, nullptr, false), 
+		m_MsgNumReceived (0), m_NumResends (0),m_IsConnectedRecently (false), m_IsStatusChanged (false),
+		m_PeerTestResendTimer (server.GetService ())
+	{
+		if (!sourceConnID) sourceConnID = ~destConnID;
+		if (!destConnID) destConnID = ~sourceConnID;
+		SetSourceConnID (sourceConnID);
+		SetDestConnID (destConnID);	
+		SetState (eSSU2SessionStatePeerTest);	
+		SetTerminationTimeout (SSU2_PEER_TEST_EXPIRATION_TIMEOUT);
+	}	
+
+	bool SSU2PeerTestSession::ProcessPeerTest (uint8_t * buf, size_t len)
+	{
+		// we are Alice or Charlie, msgs 5,6,7
+		Header header;
+		memcpy (header.buf, buf, 16);
+		header.ll[0] ^= CreateHeaderMask (i2p::context.GetSSU2IntroKey (), buf + (len - 24));
+		header.ll[1] ^= CreateHeaderMask (i2p::context.GetSSU2IntroKey (), buf + (len - 12));
+		if (header.h.type != eSSU2PeerTest)
+		{
+			LogPrint (eLogWarning, "SSU2: Unexpected message type ", (int)header.h.type, " instead ", (int)eSSU2PeerTest);
+			return false;
+		}
+		if (len < 48)
+		{
+			LogPrint (eLogWarning, "SSU2: PeerTest message too short ", len);
+			return false;
+		}
+		uint8_t nonce[12] = {0};
+		uint64_t headerX[2]; // sourceConnID, token
+		GetServer ().ChaCha20 (buf + 16, 16, i2p::context.GetSSU2IntroKey (), nonce, (uint8_t *)headerX);
+		SetDestConnID (headerX[0]);
+		// decrypt and handle payload
+		uint8_t * payload = buf + 32;
+		CreateNonce (be32toh (header.h.packetNum), nonce);
+		uint8_t h[32];
+		memcpy (h, header.buf, 16);
+		memcpy (h + 16, &headerX, 16);
+		if (!i2p::crypto::AEADChaCha20Poly1305 (payload, len - 48, h, 32,
+			i2p::context.GetSSU2IntroKey (), nonce, payload, len - 48, false))
+		{
+			LogPrint (eLogWarning, "SSU2: PeerTest AEAD verification failed ");
+			return false;
+		}
+		HandlePayload (payload, len - 48);
+		SetIsDataReceived (false);
+		return true;
+	}	
+
+	void SSU2PeerTestSession::HandleAddress (const uint8_t * buf, size_t len)
+	{
+		if (!ExtractEndpoint (buf, len, m_OurEndpoint))
+			LogPrint (eLogWarning, "SSU2: Can't handle address block from peer test message");
+	}	
+		
+	void SSU2PeerTestSession::HandlePeerTest (const uint8_t * buf, size_t len)
+	{
+		// msgs 5-7
+		if (len < 8) return;
+		uint8_t msg = buf[0];
+		if (msg <= m_MsgNumReceived)
+		{
+			LogPrint (eLogDebug, "SSU2: PeerTest msg num ", msg, " received after ", m_MsgNumReceived, ". Ignored");
+			return;
+		}	
+		size_t offset = 3; // points to signed data after msg + code + flag
+		uint32_t nonce = bufbe32toh (buf + offset + 1); // 1 - ver
+		switch (msg) // msg
+		{
+			case 5: // Alice from Charlie 1
+			{	
+				if (htobe64 (((uint64_t)nonce << 32) | nonce) == GetSourceConnID ())
+				{
+					m_PeerTestResendTimer.cancel (); // cancel delayed msg 6 if any
+					m_IsConnectedRecently = GetServer ().IsConnectedRecently (GetRemoteEndpoint ());
+					if (GetAddress ())
+					{
+						if (!m_IsConnectedRecently)
+							SetRouterStatus (eRouterStatusOK);
+						else if (m_IsStatusChanged && GetRouterStatus () == eRouterStatusFirewalled)
+							SetRouterStatus (eRouterStatusUnknown);
+						SendPeerTest (6, buf + offset, len - offset);
+					}
+				}
+				else
+					LogPrint (eLogWarning, "SSU2: Peer test 5 nonce mismatch ", nonce, " connID=", GetSourceConnID ());
+				break;
+			}
+			case 6: // Charlie from Alice
+			{	
+				m_PeerTestResendTimer.cancel (); // no more msg 5 resends
+				if (GetAddress ())
+					SendPeerTest (7, buf + offset, len - offset);
+				else
+					LogPrint (eLogWarning, "SSU2: Unknown address for peer test 6");
+				GetServer ().RequestRemoveSession (GetConnID ());
+				break;
+			}			
+			case 7: // Alice from Charlie 2
+			{	
+				m_PeerTestResendTimer.cancel (); // no more msg 6 resends
+				if (m_MsgNumReceived < 5 && m_OurEndpoint.port ()) // msg 5 was not received
+				{
+					if (m_OurEndpoint.address ().is_v4 ()) // ipv4
+					{
+						if (i2p::context.GetStatus () == eRouterStatusFirewalled)
+						{	
+						    if (m_OurEndpoint.port () != GetServer ().GetPort (true))
+								i2p::context.SetError (eRouterErrorSymmetricNAT);
+							else if (i2p::context.GetError () == eRouterErrorSymmetricNAT)
+								i2p::context.SetError (eRouterErrorNone);
+						}
+					}	
+					else
+					{
+						if (i2p::context.GetStatusV6 () == eRouterStatusFirewalled)
+						{	
+						    if (m_OurEndpoint.port () != GetServer ().GetPort (false))
+								i2p::context.SetErrorV6 (eRouterErrorSymmetricNAT);
+							else if (i2p::context.GetErrorV6 () == eRouterErrorSymmetricNAT)
+								i2p::context.SetErrorV6 (eRouterErrorNone);
+						}
+					}	
+				}	
+				GetServer ().RequestRemoveSession (GetConnID ());	
+				break;
+			}	
+			default:	
+				LogPrint (eLogWarning, "SSU2: PeerTest unexpected msg num ", msg);
+				return;
+		}	
+		m_MsgNumReceived = msg;	
+	}
+
+	void SSU2PeerTestSession::SendPeerTest (uint8_t msg)
+	{
+		auto addr = GetAddress ();
+		if (!addr) return;
+		Header header;
+		uint8_t h[32], payload[SSU2_MAX_PACKET_SIZE];
+		// fill packet
+		header.h.connID = GetDestConnID (); // dest id
+		RAND_bytes (header.buf + 8, 4); // random packet num
+		header.h.type = eSSU2PeerTest;
+		header.h.flags[0] = 2; // ver
+		header.h.flags[1] = (uint8_t)i2p::context.GetNetID (); // netID
+		header.h.flags[2] = 0; // flag
+		memcpy (h, header.buf, 16);
+		htobuf64 (h + 16, GetSourceConnID ()); // source id
+		// payload
+		payload[0] = eSSU2BlkDateTime;
+		htobe16buf (payload + 1, 4);
+		htobe32buf (payload + 3, (i2p::util::GetMillisecondsSinceEpoch () + 500)/1000);
+		size_t payloadSize = 7;
+		if (msg == 6 || msg == 7)
+			payloadSize += CreateAddressBlock (payload + payloadSize, GetMaxPayloadSize () - payloadSize, GetRemoteEndpoint ());
+		payloadSize += CreatePeerTestBlock (payload + payloadSize, GetMaxPayloadSize () - payloadSize,
+			msg, eSSU2PeerTestCodeAccept, nullptr, m_SignedData.data (), m_SignedData.size ());
+		payloadSize += CreatePaddingBlock (payload + payloadSize, GetMaxPayloadSize () - payloadSize);
+		// encrypt
+		uint8_t n[12];
+		CreateNonce (be32toh (header.h.packetNum), n);
+		i2p::crypto::AEADChaCha20Poly1305 (payload, payloadSize, h, 32, addr->i, n, payload, payloadSize + 16, true);
+		payloadSize += 16;
+		header.ll[0] ^= CreateHeaderMask (addr->i, payload + (payloadSize - 24));
+		header.ll[1] ^= CreateHeaderMask (addr->i, payload + (payloadSize - 12));
+		memset (n, 0, 12);
+		GetServer ().ChaCha20 (h + 16, 16, addr->i, n, h + 16);
+		// send
+		GetServer ().Send (header.buf, 16, h + 16, 16, payload, payloadSize, GetRemoteEndpoint ());
+		UpdateNumSentBytes (payloadSize + 32);
+	}	
+
+	void SSU2PeerTestSession::SendPeerTest (uint8_t msg, const uint8_t * signedData, size_t signedDataLen, bool delayed)
+	{
+#if __cplusplus >= 202002L // C++20
+		m_SignedData.assign (signedData, signedData + signedDataLen);
+#else		
+		m_SignedData.resize (signedDataLen);
+		memcpy (m_SignedData.data (), signedData, signedDataLen);
+#endif		
+		if (!delayed)
+			SendPeerTest (msg);
+		// schedule resend for msgs 5 or 6
+		if (msg == 5 || msg == 6)
+			ScheduleResend (msg);
+	}	
+		
+	void SSU2PeerTestSession::SendPeerTest (uint8_t msg, const uint8_t * signedData, size_t signedDataLen, 
+		std::shared_ptr<const i2p::data::RouterInfo::Address> addr, bool delayed)
+	{
+		if (!addr) return;
+		SetAddress (addr);
+		SendPeerTest (msg, signedData, signedDataLen, delayed);	
+	}	
+
+	void SSU2PeerTestSession::Connect ()
+	{
+		LogPrint (eLogError, "SSU2: Can't connect peer test session");
+	}	
+
+	bool SSU2PeerTestSession::ProcessFirstIncomingMessage (uint64_t connID, uint8_t * buf, size_t len)
+	{
+		LogPrint (eLogError, "SSU2: Can't handle incoming message in peer test session");
+		return false;
+	}	
+
+	void SSU2PeerTestSession::ScheduleResend (uint8_t msg)
+	{
+		if (m_NumResends < SSU2_PEER_TEST_MAX_NUM_RESENDS)
+		{
+			m_PeerTestResendTimer.expires_from_now (boost::posix_time::milliseconds(
+				SSU2_PEER_TEST_RESEND_INTERVAL + GetServer ().GetRng ()() % SSU2_PEER_TEST_RESEND_INTERVAL_VARIANCE));
+			std::weak_ptr<SSU2PeerTestSession> s(std::static_pointer_cast<SSU2PeerTestSession>(shared_from_this ()));
+			m_PeerTestResendTimer.async_wait ([s, msg](const boost::system::error_code& ecode)
+				{
+					if (ecode != boost::asio::error::operation_aborted)
+					{
+						auto s1 = s.lock ();
+						if (s1) 
+						{
+							if (msg > s1->m_MsgNumReceived) 
+							{	
+								s1->SendPeerTest (msg);
+								s1->m_NumResends++;
+								s1->ScheduleResend (msg);
+							}	
+						}	
+					}	
+				});
+		}	
+	}	
+
+	SSU2HolePunchSession::SSU2HolePunchSession (SSU2Server& server, uint32_t nonce,
+		const boost::asio::ip::udp::endpoint& remoteEndpoint,
+		std::shared_ptr<const i2p::data::RouterInfo::Address> addr):
+		SSU2Session (server), // we create full incoming session
+		m_NumResends (0), m_HolePunchResendTimer (server.GetService ())
+	{
+		// we are Charlie
+		uint64_t destConnID = htobe64 (((uint64_t)nonce << 32) | nonce); // dest id
+		uint32_t sourceConnID = ~destConnID;
+		SetSourceConnID (sourceConnID);
+		SetDestConnID (destConnID);	
+		SetState (eSSU2SessionStateHolePunch);
+		SetRemoteEndpoint (remoteEndpoint);
+		SetAddress (addr);
+		SetTerminationTimeout (SSU2_RELAY_NONCE_EXPIRATION_TIMEOUT);	
+	}	
+
+	void SSU2HolePunchSession::SendHolePunch ()
+	{
+		auto addr = GetAddress ();
+		if (!addr) return;
+		auto& ep = GetRemoteEndpoint ();
+		LogPrint (eLogDebug, "SSU2: Sending HolePunch to ", ep);
+		Header header;
+		uint8_t h[32], payload[SSU2_MAX_PACKET_SIZE];
+		// fill packet
+		header.h.connID = GetDestConnID (); // dest id
+		RAND_bytes (header.buf + 8, 4); // random packet num
+		header.h.type = eSSU2HolePunch;
+		header.h.flags[0] = 2; // ver
+		header.h.flags[1] = (uint8_t)i2p::context.GetNetID (); // netID
+		header.h.flags[2] = 0; // flag
+		memcpy (h, header.buf, 16);
+		htobuf64 (h + 16, GetSourceConnID ()); // source id
+		RAND_bytes (h + 24, 8); // header token, to be ignored by Alice
+		// payload
+		payload[0] = eSSU2BlkDateTime;
+		htobe16buf (payload + 1, 4);
+		htobe32buf (payload + 3, (i2p::util::GetMillisecondsSinceEpoch () + 500)/1000);
+		size_t payloadSize = 7;
+		payloadSize += CreateAddressBlock (payload + payloadSize, GetMaxPayloadSize () - payloadSize, ep);
+		// relay response block	
+		if (payloadSize + m_RelayResponseBlock.size () < GetMaxPayloadSize ())
+		{	
+			memcpy (payload + payloadSize, m_RelayResponseBlock.data (), m_RelayResponseBlock.size ());
+			payloadSize += m_RelayResponseBlock.size ();
+		}	
+		payloadSize += CreatePaddingBlock (payload + payloadSize, GetMaxPayloadSize () - payloadSize);
+		// encrypt
+		uint8_t n[12];
+		CreateNonce (be32toh (header.h.packetNum), n);
+		i2p::crypto::AEADChaCha20Poly1305 (payload, payloadSize, h, 32, addr->i, n, payload, payloadSize + 16, true);
+		payloadSize += 16;
+		header.ll[0] ^= CreateHeaderMask (addr->i, payload + (payloadSize - 24));
+		header.ll[1] ^= CreateHeaderMask (addr->i, payload + (payloadSize - 12));
+		memset (n, 0, 12);
+		GetServer ().ChaCha20 (h + 16, 16, addr->i, n, h + 16);
+		// send
+		GetServer ().Send (header.buf, 16, h + 16, 16, payload, payloadSize, ep);
+		UpdateNumSentBytes (payloadSize + 32);
+	}	
+
+	void SSU2HolePunchSession::SendHolePunch (const uint8_t * relayResponseBlock, size_t relayResponseBlockLen)
+	{
+#if __cplusplus >= 202002L // C++20
+		m_RelayResponseBlock.assign (relayResponseBlock, relayResponseBlock + relayResponseBlockLen);
+#else		
+		m_RelayResponseBlock.resize (relayResponseBlockLen);
+		memcpy (m_RelayResponseBlock.data (), relayResponseBlock, relayResponseBlockLen);
+#endif		
+		SendHolePunch ();
+		ScheduleResend ();
+	}	
+
+	void SSU2HolePunchSession::ScheduleResend ()
+	{
+		if (m_NumResends < SSU2_HOLE_PUNCH_MAX_NUM_RESENDS)
+		{
+			m_HolePunchResendTimer.expires_from_now (boost::posix_time::milliseconds(
+				SSU2_HOLE_PUNCH_RESEND_INTERVAL + GetServer ().GetRng ()() % SSU2_HOLE_PUNCH_RESEND_INTERVAL_VARIANCE));
+			std::weak_ptr<SSU2HolePunchSession> s(std::static_pointer_cast<SSU2HolePunchSession>(shared_from_this ()));
+			m_HolePunchResendTimer.async_wait ([s](const boost::system::error_code& ecode)
+				{
+					if (ecode != boost::asio::error::operation_aborted)
+					{
+						auto s1 = s.lock ();
+						if (s1 && s1->GetState () == eSSU2SessionStateHolePunch) 
+						{
+							s1->SendHolePunch ();
+							s1->m_NumResends++;
+							s1->ScheduleResend ();	
+						}	
+					}	
+				});
+		}	
+	}
+
+	bool SSU2HolePunchSession::ProcessFirstIncomingMessage (uint64_t connID, uint8_t * buf, size_t len)
+	{
+		m_HolePunchResendTimer.cancel ();
+		return SSU2Session::ProcessFirstIncomingMessage (connID, buf, len);
+	}	
+}
+}

libi2pd/SSU2OutOfSession.h

@@ -0,0 +1,86 @@
+/*
+* Copyright (c) 2024, The PurpleI2P Project
+*
+* This file is part of Purple i2pd project and licensed under BSD3
+*
+* See full license text in LICENSE file at top of project tree
+*/
+
+#ifndef SSU2_OUT_OF_SESSION_H__
+#define SSU2_OUT_OF_SESSION_H__
+
+#include <vector>
+#include "SSU2Session.h"
+
+namespace i2p
+{
+namespace transport
+{
+	const int SSU2_PEER_TEST_RESEND_INTERVAL = 3000; // in milliseconds
+	const int SSU2_PEER_TEST_RESEND_INTERVAL_VARIANCE = 2000; // in milliseconds
+	const int SSU2_PEER_TEST_MAX_NUM_RESENDS = 3;
+	
+	class SSU2PeerTestSession: public SSU2Session // for PeerTest msgs 5,6,7
+	{
+		public:
+
+			SSU2PeerTestSession (SSU2Server& server, uint64_t sourceConnID, uint64_t destConnID);
+
+			uint8_t GetMsgNumReceived () const { return m_MsgNumReceived; }	
+			bool IsConnectedRecently () const { return m_IsConnectedRecently; }
+			void SetStatusChanged () { m_IsStatusChanged = true; }
+			
+			void SendPeerTest (uint8_t msg, const uint8_t * signedData, size_t signedDataLen, 
+				std::shared_ptr<const i2p::data::RouterInfo::Address> addr, bool delayed = false);
+			bool ProcessPeerTest (uint8_t * buf, size_t len) override;
+			void Connect () override; // outgoing
+			bool ProcessFirstIncomingMessage (uint64_t connID, uint8_t * buf, size_t len) override; // incoming
+			
+		private:
+
+			void SendPeerTest (uint8_t msg, const uint8_t * signedData, size_t signedDataLen, bool delayed = false); // PeerTest message
+			void SendPeerTest (uint8_t msg); // send or resend m_SignedData
+			void HandlePeerTest (const uint8_t * buf, size_t len) override;
+			void HandleAddress (const uint8_t * buf, size_t len) override;
+
+			void ScheduleResend (uint8_t msg);
+			
+		private:
+
+			uint8_t m_MsgNumReceived, m_NumResends;
+			bool m_IsConnectedRecently, m_IsStatusChanged;
+			std::vector<uint8_t> m_SignedData; // for resends
+			boost::asio::deadline_timer m_PeerTestResendTimer;
+			boost::asio::ip::udp::endpoint m_OurEndpoint; // as seen by peer
+	};	
+
+	const int SSU2_HOLE_PUNCH_RESEND_INTERVAL = 1000; // in milliseconds
+	const int SSU2_HOLE_PUNCH_RESEND_INTERVAL_VARIANCE = 500; // in milliseconds
+	const int SSU2_HOLE_PUNCH_MAX_NUM_RESENDS = 3;
+	
+	class SSU2HolePunchSession: public SSU2Session // Charlie
+	{
+		public:
+
+			SSU2HolePunchSession (SSU2Server& server, uint32_t nonce, const boost::asio::ip::udp::endpoint& remoteEndpoint,
+				std::shared_ptr<const i2p::data::RouterInfo::Address> addr);
+
+			void SendHolePunch (const uint8_t * relayResponseBlock, size_t relayResponseBlockLen);
+
+			bool ProcessFirstIncomingMessage (uint64_t connID, uint8_t * buf, size_t len) override; // SessionRequest
+			
+		private:
+			
+			void SendHolePunch ();
+			void ScheduleResend ();
+			
+		private:
+
+			int m_NumResends;
+			std::vector<uint8_t> m_RelayResponseBlock;
+			boost::asio::deadline_timer m_HolePunchResendTimer;
+	};	
+}
+}
+	
+#endif

libi2pd/SSU2Session.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2022-2024, The PurpleI2P Project
+* Copyright (c) 2022-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -15,6 +15,7 @@
 #include <set>
 #include <list>
 #include <boost/asio.hpp>
+#include "version.h"
 #include "Crypto.h"
 #include "RouterInfo.h"
 #include "RouterContext.h"
@@ -37,6 +38,7 @@ namespace transport
 	const size_t SSU2_MIN_PACKET_SIZE = 1280;
 	const int SSU2_HANDSHAKE_RESEND_INTERVAL = 1000; // in milliseconds
 	const int SSU2_MAX_NUM_RESENDS = 5;
+	const int SSU2_RESEND_ATTEMPT_MIN_INTERVAL = 3; // in milliseconds
 	const int SSU2_INCOMPLETE_MESSAGES_CLEANUP_TIMEOUT = 30; // in seconds
 	const int SSU2_MAX_NUM_RECEIVED_I2NP_MSGIDS = 5000; // how many msgID we store for duplicates check
 	const int SSU2_RECEIVED_I2NP_MSGIDS_CLEANUP_TIMEOUT = 10; // in seconds
@@ -54,6 +56,7 @@ namespace transport
 	const int SSU2_MAX_NUM_ACK_RANGES = 32; // to send
 	const uint8_t SSU2_MAX_NUM_FRAGMENTS = 64;
 	const int SSU2_SEND_DATETIME_NUM_PACKETS = 256;
+	const int SSU2_MIN_RELAY_RESPONSE_RESEND_VERSION = MAKE_VERSION_NUMBER(0, 9, 64); // 0.9.64
 
 	// flags
 	const uint8_t SSU2_FLAG_IMMEDIATE_ACK_REQUESTED = 0x01;
@@ -111,8 +114,8 @@ namespace transport
 		eSSU2SessionStateTerminated,
 		eSSU2SessionStateFailed,
 		eSSU2SessionStateIntroduced,
+		eSSU2SessionStateHolePunch,
 		eSSU2SessionStatePeerTest,
-		eSSU2SessionStatePeerTestReceived, // 5 before 4
 		eSSU2SessionStateTokenRequestReceived
 	};
 
@@ -205,36 +208,40 @@ namespace transport
 	class SSU2Server;
 	class SSU2Session: public TransportSession, public std::enable_shared_from_this<SSU2Session>
 	{
-		union Header
-		{
-			uint64_t ll[2];
-			uint8_t buf[16];
-			struct
+		protected:
+			
+			union Header
 			{
-				uint64_t connID;
-				uint32_t packetNum;
-				uint8_t type;
-				uint8_t flags[3];
-			} h;
-		};
+				uint64_t ll[2];
+				uint8_t buf[16];
+				struct
+				{
+					uint64_t connID;
+					uint32_t packetNum;
+					uint8_t type;
+					uint8_t flags[3];
+				} h;
+			};
 
-		struct HandshakePacket
-		{
-			Header header;
-			uint8_t headerX[48]; // part1 for SessionConfirmed
-			uint8_t payload[SSU2_MAX_PACKET_SIZE*2];
-			size_t payloadSize = 0;
-			uint64_t sendTime = 0; // in milliseconds
-			bool isSecondFragment = false; // for SessionConfirmed
-		};
+		private:
+			
+			struct HandshakePacket
+			{
+				Header header;
+				uint8_t headerX[48]; // part1 for SessionConfirmed
+				uint8_t payload[SSU2_MAX_PACKET_SIZE*2];
+				size_t payloadSize = 0;
+				uint64_t sendTime = 0; // in milliseconds
+				bool isSecondFragment = false; // for SessionConfirmed
+			};
 
-		typedef std::function<void ()> OnEstablished;
+			typedef std::function<void ()> OnEstablished;
 
 		public:
 
 			SSU2Session (SSU2Server& server, std::shared_ptr<const i2p::data::RouterInfo> in_RemoteRouter = nullptr,
-				std::shared_ptr<const i2p::data::RouterInfo::Address> addr = nullptr);
-			~SSU2Session ();
+				std::shared_ptr<const i2p::data::RouterInfo::Address> addr = nullptr, bool noise = true);
+			virtual ~SSU2Session ();
 
 			void SetRemoteEndpoint (const boost::asio::ip::udp::endpoint& ep) { m_RemoteEndpoint = ep; };
 			const boost::asio::ip::udp::endpoint& GetRemoteEndpoint () const { return m_RemoteEndpoint; };
@@ -244,7 +251,7 @@ namespace transport
 			void SetOnEstablished (OnEstablished e) { m_OnEstablished = e; };
 			OnEstablished GetOnEstablished () const { return m_OnEstablished; };
 
-			void Connect ();
+			virtual void Connect ();
 			bool Introduce (std::shared_ptr<SSU2Session> session, uint32_t relayTag);
 			void WaitForIntroduction ();
 			void SendPeerTest (); // Alice, Data message
@@ -254,29 +261,54 @@ namespace transport
 			void FlushData ();
 			void Done () override;
 			void SendLocalRouterInfo (bool update) override;
-			void SendI2NPMessages (const std::vector<std::shared_ptr<I2NPMessage> >& msgs) override;
+			void SendI2NPMessages (std::list<std::shared_ptr<I2NPMessage> >& msgs) override;
+			void MoveSendQueue (std::shared_ptr<SSU2Session> other);
 			uint32_t GetRelayTag () const override { return m_RelayTag; };
-			size_t Resend (uint64_t ts); // return number or resent packets
+			size_t Resend (uint64_t ts); // return number of resent packets
+			uint64_t GetLastResendTime () const { return m_LastResendTime; };
 			bool IsEstablished () const override { return m_State == eSSU2SessionStateEstablished; };
+			i2p::data::RouterInfo::SupportedTransports GetTransportType () const override;
 			uint64_t GetConnID () const { return m_SourceConnID; };
 			SSU2SessionState GetState () const { return m_State; };
 			void SetState (SSU2SessionState state) { m_State = state; };
 
-			bool ProcessFirstIncomingMessage (uint64_t connID, uint8_t * buf, size_t len);
+			virtual bool ProcessFirstIncomingMessage (uint64_t connID, uint8_t * buf, size_t len);
 			bool ProcessSessionCreated (uint8_t * buf, size_t len);
 			bool ProcessSessionConfirmed (uint8_t * buf, size_t len);
 			bool ProcessRetry (uint8_t * buf, size_t len);
 			bool ProcessHolePunch (uint8_t * buf, size_t len);
-			bool ProcessPeerTest (uint8_t * buf, size_t len);
+			virtual bool ProcessPeerTest (uint8_t * buf, size_t len);
 			void ProcessData (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& from);
 
+		protected:
+
+			SSU2Server& GetServer () { return m_Server; }
+			RouterStatus GetRouterStatus () const;
+			void SetRouterStatus (RouterStatus status) const;
+			size_t GetMaxPayloadSize () const { return m_MaxPayloadSize; }
+			void SetIsDataReceived (bool dataReceived) { m_IsDataReceived = dataReceived; };
+			
+			uint64_t GetSourceConnID () const { return m_SourceConnID; }
+			void SetSourceConnID (uint64_t sourceConnID) { m_SourceConnID = sourceConnID; }
+			uint64_t GetDestConnID () const { return m_DestConnID; }
+			void SetDestConnID (uint64_t destConnID) { m_DestConnID = destConnID; }
+
+			void SetAddress (std::shared_ptr<const i2p::data::RouterInfo::Address> addr) { m_Address = addr; }
+			void HandlePayload (const uint8_t * buf, size_t len);
+
+			size_t CreateAddressBlock (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& ep);
+			size_t CreatePaddingBlock (uint8_t * buf, size_t len, size_t minSize = 0);
+			size_t CreatePeerTestBlock (uint8_t * buf, size_t len, uint8_t msg, SSU2PeerTestCode code, const uint8_t * routerHash, const uint8_t * signedData, size_t signedDataLen);
+
+			bool ExtractEndpoint (const uint8_t * buf, size_t size, boost::asio::ip::udp::endpoint& ep);
+			
 		private:
 
 			void Terminate ();
 			void Established ();
 			void ScheduleConnectTimer ();
 			void HandleConnectTimer (const boost::system::error_code& ecode);
-			void PostI2NPMessages (std::vector<std::shared_ptr<I2NPMessage> > msgs);
+			void PostI2NPMessages ();
 			bool SendQueue (); // returns true if ack block was sent
 			bool SendFragmentedMessage (std::shared_ptr<I2NPMessage> msg);
 			void ResendHandshakePacket ();
@@ -294,48 +326,41 @@ namespace transport
 			uint32_t SendData (const uint8_t * buf, size_t len, uint8_t flags = 0); // returns packet num
 			void SendQuickAck ();
 			void SendTermination ();
-			void SendHolePunch (uint32_t nonce, const boost::asio::ip::udp::endpoint& ep, const uint8_t * introKey, uint64_t token);
-			void SendPeerTest (uint8_t msg, const uint8_t * signedData, size_t signedDataLen, const uint8_t * introKey); // PeerTest message
 			void SendPathResponse (const uint8_t * data, size_t len);
 			void SendPathChallenge ();
 
-			void HandlePayload (const uint8_t * buf, size_t len);
 			void HandleDateTime (const uint8_t * buf, size_t len);
+			void HandleRouterInfo (const uint8_t * buf, size_t len);
 			void HandleAck (const uint8_t * buf, size_t len);
 			void HandleAckRange (uint32_t firstPacketNum, uint32_t lastPacketNum, uint64_t ts);
-			void HandleAddress (const uint8_t * buf, size_t len);
-			bool ExtractEndpoint (const uint8_t * buf, size_t size, boost::asio::ip::udp::endpoint& ep);
+			virtual void HandleAddress (const uint8_t * buf, size_t len);
 			size_t CreateEndpoint (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& ep);
 			std::shared_ptr<const i2p::data::RouterInfo::Address> FindLocalAddress () const;
 			void AdjustMaxPayloadSize ();
-			RouterStatus GetRouterStatus () const;
-			void SetRouterStatus (RouterStatus status) const;
 			bool GetTestingState () const;
 			void SetTestingState(bool testing) const;
 			std::shared_ptr<const i2p::data::RouterInfo> ExtractRouterInfo (const uint8_t * buf, size_t size);
-			void CreateNonce (uint64_t seqn, uint8_t * nonce);
 			bool UpdateReceivePacketNum (uint32_t packetNum); // for Ack, returns false if duplicate
 			void HandleFirstFragment (const uint8_t * buf, size_t len);
 			void HandleFollowOnFragment (const uint8_t * buf, size_t len);
 			void HandleRelayRequest (const uint8_t * buf, size_t len);
 			void HandleRelayIntro (const uint8_t * buf, size_t len, int attempts = 0);
 			void HandleRelayResponse (const uint8_t * buf, size_t len);
-			void HandlePeerTest (const uint8_t * buf, size_t len);
+			virtual void HandlePeerTest (const uint8_t * buf, size_t len);
 			void HandleI2NPMsg (std::shared_ptr<I2NPMessage>&& msg);
 
-			size_t CreateAddressBlock (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& ep);
 			size_t CreateRouterInfoBlock (uint8_t * buf, size_t len, std::shared_ptr<const i2p::data::RouterInfo> r);
+			size_t CreateRouterInfoBlock (uint8_t * buf, size_t len, std::shared_ptr<const i2p::data::RouterInfo::Buffer> riBuffer);
 			size_t CreateAckBlock (uint8_t * buf, size_t len);
-			size_t CreatePaddingBlock (uint8_t * buf, size_t len, size_t minSize = 0);
 			size_t CreateI2NPBlock (uint8_t * buf, size_t len, std::shared_ptr<I2NPMessage>&& msg);
 			size_t CreateFirstFragmentBlock (uint8_t * buf, size_t len, std::shared_ptr<I2NPMessage> msg);
 			size_t CreateFollowOnFragmentBlock (uint8_t * buf, size_t len, std::shared_ptr<I2NPMessage> msg, uint8_t& fragmentNum, uint32_t msgID);
 			size_t CreateRelayIntroBlock (uint8_t * buf, size_t len, const uint8_t * introData, size_t introDataLen);
 			size_t CreateRelayResponseBlock (uint8_t * buf, size_t len, SSU2RelayResponseCode code, uint32_t nonce, uint64_t token, bool v4);
-			size_t CreatePeerTestBlock (uint8_t * buf, size_t len, uint8_t msg, SSU2PeerTestCode code, const uint8_t * routerHash, const uint8_t * signedData, size_t signedDataLen);
+
 			size_t CreatePeerTestBlock (uint8_t * buf, size_t len, uint32_t nonce); // Alice
 			size_t CreateTerminationBlock (uint8_t * buf, size_t len);
-
+			
 		private:
 
 			SSU2Server& m_Server;
@@ -346,6 +371,7 @@ namespace transport
 			std::shared_ptr<const i2p::data::RouterInfo::Address> m_Address;
 			boost::asio::ip::udp::endpoint m_RemoteEndpoint;
 			i2p::data::RouterInfo::CompatibleTransports m_RemoteTransports, m_RemotePeerTestTransports; 
+			int m_RemoteVersion;
 			uint64_t m_DestConnID, m_SourceConnID;
 			SSU2SessionState m_State;
 			uint8_t m_KeyDataSend[64], m_KeyDataReceive[64];
@@ -353,10 +379,11 @@ namespace transport
 			std::set<uint32_t> m_OutOfSequencePackets; // packet nums > receive packet num
 			std::map<uint32_t, std::shared_ptr<SSU2SentPacket> > m_SentPackets; // packetNum -> packet
 			std::unordered_map<uint32_t, std::shared_ptr<SSU2IncompleteMessage> > m_IncompleteMessages; // msgID -> I2NP
-			std::map<uint32_t, std::pair <std::shared_ptr<SSU2Session>, uint64_t > > m_RelaySessions; // nonce->(Alice, timestamp) for Bob or nonce->(Charlie, timestamp) for Alice
-			std::map<uint32_t, std::pair <std::shared_ptr<SSU2Session>, uint64_t > > m_PeerTests; // same as for relay sessions
+			std::unordered_map<uint32_t, std::pair <std::shared_ptr<SSU2Session>, uint64_t > > m_RelaySessions; // nonce->(Alice, timestamp) for Bob or nonce->(Charlie, timestamp) for Alice
 			std::list<std::shared_ptr<I2NPMessage> > m_SendQueue;
 			i2p::I2NPMessagesHandler m_Handler;
+			std::list<std::shared_ptr<I2NPMessage> > m_IntermediateQueue; // from transports
+			mutable std::mutex m_IntermediateQueueMutex;
 			bool m_IsDataReceived;
 			double m_RTT;
 			int m_MsgLocalExpirationTimeout;
@@ -369,14 +396,23 @@ namespace transport
 			size_t m_MaxPayloadSize;
 			std::unique_ptr<i2p::data::IdentHash> m_PathChallenge;
 			std::unordered_map<uint32_t, uint32_t> m_ReceivedI2NPMsgIDs; // msgID -> timestamp in seconds
+			uint64_t m_LastResendTime, m_LastResendAttemptTime; // in milliseconds
+			int m_NumRanges;
+			uint8_t m_Ranges[SSU2_MAX_NUM_ACK_RANGES*2]; // ranges sent with previous Ack if any
 	};
-
+	
 	inline uint64_t CreateHeaderMask (const uint8_t * kh, const uint8_t * nonce)
 	{
 		uint64_t data = 0;
 		i2p::crypto::ChaCha20 ((uint8_t *)&data, 8, kh, nonce, (uint8_t *)&data);
 		return data;
 	}
+
+	inline void CreateNonce (uint64_t seqn, uint8_t * nonce)
+	{
+		memset (nonce, 0, 4);
+		htole64buf (nonce + 4, seqn);
+	}
 }
 }
 

libi2pd/Streaming.h

@@ -19,6 +19,7 @@
 #include <mutex>
 #include <boost/asio.hpp>
 #include "Base.h"
+#include "Gzip.h"
 #include "I2PEndian.h"
 #include "Identity.h"
 #include "LeaseSet.h"
@@ -52,22 +53,30 @@ namespace stream
 	const size_t STREAMING_MTU_RATCHETS = 1812;
 	const size_t MAX_PACKET_SIZE = 4096;
 	const size_t COMPRESSION_THRESHOLD_SIZE = 66;
-	const int MAX_NUM_RESEND_ATTEMPTS = 9;
-	const int WINDOW_SIZE = 6; // in messages
-	const int MIN_WINDOW_SIZE = 1;
-	const int MAX_WINDOW_SIZE = 128;
-	const int WINDOW_SIZE_DROP_FRACTION = 10; // 1/10
-	const double RTT_EWMA_ALPHA = 0.125;
+	const int MAX_NUM_RESEND_ATTEMPTS = 10;
+	const int INITIAL_WINDOW_SIZE = 10;
+	const int MIN_WINDOW_SIZE = 3;
+	const int MAX_WINDOW_SIZE = 512;
+	const double RTT_EWMA_ALPHA = 0.25;
+	const double SLOWRTT_EWMA_ALPHA = 0.05;
+	const double PREV_SPEED_KEEP_TIME_COEFF = 0.35; // 0.1 - 1 // how long will the window size stay around the previous drop level, less is longer
 	const int MIN_RTO = 20; // in milliseconds
-	const int INITIAL_RTT = 8000; // in milliseconds
+	const int INITIAL_RTT = 1500; // in milliseconds
 	const int INITIAL_RTO = 9000; // in milliseconds
+	const int INITIAL_PACING_TIME = 1000 * INITIAL_RTT / INITIAL_WINDOW_SIZE; // in microseconds
 	const int MIN_SEND_ACK_TIMEOUT = 2; // in milliseconds
 	const int SYN_TIMEOUT = 200; // how long we wait for SYN after follow-on, in milliseconds
-	const size_t MAX_PENDING_INCOMING_BACKLOG = 128;
+	const size_t MAX_PENDING_INCOMING_BACKLOG = 1024;
 	const int PENDING_INCOMING_TIMEOUT = 10; // in seconds
 	const int MAX_RECEIVE_TIMEOUT = 20; // in seconds
 	const uint16_t DELAY_CHOKING = 60000; // in milliseconds
-
+	const uint64_t SEND_INTERVAL = 10000; // in microseconds
+	const uint64_t SEND_INTERVAL_VARIANCE = 2000; // in microseconds
+	const uint64_t REQUEST_IMMEDIATE_ACK_INTERVAL = 7500; // in milliseconds 
+	const uint64_t REQUEST_IMMEDIATE_ACK_INTERVAL_VARIANCE = 3200; // in milliseconds 	
+	const bool LOSS_BASED_CONTROL_ENABLED = 1; // 0/1
+	const uint64_t STREAMING_DESTINATION_POOLS_CLEANUP_INTERVAL = 646; // in seconds
+	
 	struct Packet
 	{
 		size_t len, offset;
@@ -77,7 +86,7 @@ namespace stream
 
 		Packet (): len (0), offset (0), sendTime (0), resent (false) {};
 		uint8_t * GetBuffer () { return buf + offset; };
-		size_t GetLength () const { return len - offset; };
+		size_t GetLength () const { return len > offset ? len - offset : 0; };
 
 		uint32_t GetSendStreamID () const { return bufbe32toh (buf); };
 		uint32_t GetReceiveStreamID () const { return bufbe32toh (buf + 4); };
@@ -167,9 +176,9 @@ namespace stream
 	{
 		public:
 
-			Stream (boost::asio::io_service& service, StreamingDestination& local,
+			Stream (boost::asio::io_context& service, StreamingDestination& local,
 				std::shared_ptr<const i2p::data::LeaseSet> remote, int port = 0); // outgoing
-			Stream (boost::asio::io_service& service, StreamingDestination& local); // incoming
+			Stream (boost::asio::io_context& service, StreamingDestination& local); // incoming
 
 			~Stream ();
 			uint32_t GetSendStreamID () const { return m_SendStreamID; };
@@ -178,8 +187,10 @@ namespace stream
 			std::shared_ptr<const i2p::data::IdentityEx> GetRemoteIdentity () const { return m_RemoteIdentity; };
 			bool IsOpen () const { return m_Status == eStreamStatusOpen; };
 			bool IsEstablished () const { return m_SendStreamID; };
+			bool IsIncoming () const { return m_IsIncoming; };
 			StreamStatus GetStatus () const { return m_Status; };
 			StreamingDestination& GetLocalDestination () { return m_LocalDestination; };
+			void ResetRoutingPath ();
 
 			void HandleNextPacket (Packet * packet);
 			void HandlePing (Packet * packet);
@@ -192,7 +203,7 @@ namespace stream
 			size_t ReadSome (uint8_t * buf, size_t len) { return ConcatenatePackets (buf, len); };
 			size_t Receive (uint8_t * buf, size_t len, int timeout);
 
-			void AsyncClose() { m_Service.post(std::bind(&Stream::Close, shared_from_this())); };
+			void AsyncClose() { boost::asio::post(m_Service, std::bind(&Stream::Close, shared_from_this())); };
 
 			/** only call close from destination thread, use Stream::AsyncClose for other threads */
 			void Close ();
@@ -228,40 +239,69 @@ namespace stream
 			void UpdateCurrentRemoteLease (bool expired = false);
 
 			template<typename Buffer, typename ReceiveHandler>
-			void HandleReceiveTimer (const boost::system::error_code& ecode, const Buffer& buffer, ReceiveHandler handler, int remainingTimeout);
+			void HandleReceiveTimer (const boost::system::error_code& ecode, Buffer& buffer, ReceiveHandler handler, int remainingTimeout);
 
+			void ScheduleSend ();
+			void HandleSendTimer (const boost::system::error_code& ecode);
 			void ScheduleResend ();
 			void HandleResendTimer (const boost::system::error_code& ecode);
+			void ResendPacket ();
 			void ScheduleAck (int timeout);
 			void HandleAckSendTimer (const boost::system::error_code& ecode);
 
+			void UpdatePacingTime ();
+			void ProcessWindowDrop ();
+			void ResetWindowSize ();
+			void CancelRemoteLeaseChange ();
+			
 		private:
 
-			boost::asio::io_service& m_Service;
+			boost::asio::io_context& m_Service;
 			uint32_t m_SendStreamID, m_RecvStreamID, m_SequenceNumber;
+			uint32_t m_DropWindowDelaySequenceNumber;
 			uint32_t m_TunnelsChangeSequenceNumber;
 			int32_t m_LastReceivedSequenceNumber;
+			int32_t m_PreviousReceivedSequenceNumber;
+			int32_t m_LastConfirmedReceivedSequenceNumber; // for limit inbound speed
 			StreamStatus m_Status;
+			bool m_IsIncoming;
 			bool m_IsAckSendScheduled;
+			bool m_IsNAcked;
+			bool m_IsFirstACK;
+			bool m_IsResendNeeded;
+			bool m_IsFirstRttSample;
+			bool m_IsSendTime;
+			bool m_IsWinDropped;
+			bool m_IsClientChoked;
+			bool m_IsTimeOutResend;
+			bool m_IsImmediateAckRequested;
+			bool m_IsRemoteLeaseChangeInProgress;
+			bool m_DoubleWinIncCounter;
 			StreamingDestination& m_LocalDestination;
 			std::shared_ptr<const i2p::data::IdentityEx> m_RemoteIdentity;
 			std::shared_ptr<const i2p::crypto::Verifier> m_TransientVerifier; // in case of offline key
 			std::shared_ptr<const i2p::data::LeaseSet> m_RemoteLeaseSet;
 			std::shared_ptr<i2p::garlic::GarlicRoutingSession> m_RoutingSession;
 			std::shared_ptr<const i2p::data::Lease> m_CurrentRemoteLease;
+			std::shared_ptr<const i2p::data::Lease> m_NextRemoteLease;
 			std::shared_ptr<i2p::tunnel::OutboundTunnel> m_CurrentOutboundTunnel;
 			std::queue<Packet *> m_ReceiveQueue;
 			std::set<Packet *, PacketCmp> m_SavedPackets;
 			std::set<Packet *, PacketCmp> m_SentPackets;
-			boost::asio::deadline_timer m_ReceiveTimer, m_ResendTimer, m_AckSendTimer;
+			std::set<Packet *, PacketCmp> m_NACKedPackets;
+			boost::asio::deadline_timer m_ReceiveTimer, m_SendTimer, m_ResendTimer, m_AckSendTimer;
 			size_t m_NumSentBytes, m_NumReceivedBytes;
 			uint16_t m_Port;
 
 			SendBufferQueue m_SendBuffer;
-			double m_RTT;
-			int m_WindowSize, m_RTO, m_AckDelay;
-			uint64_t m_LastWindowSizeIncreaseTime;
-			int m_NumResendAttempts;
+			double m_RTT, m_SlowRTT, m_SlowRTT2;
+			float m_WindowSize, m_LastWindowDropSize, m_WindowDropTargetSize;
+			int m_WindowIncCounter, m_RTO, m_AckDelay, m_PrevRTTSample, m_WindowSizeTail;
+			double m_Jitter;
+			uint64_t m_MinPacingTime, m_PacingTime, m_PacingTimeRem, // microseconds
+				m_LastSendTime, m_LastACKRecieveTime, m_ACKRecieveInterval, m_RemoteLeaseChangeTime;	// milliseconds
+			uint64_t m_LastACKSendTime, m_PacketACKInterval, m_PacketACKIntervalRem; // for limit inbound speed
+			int m_NumResendAttempts, m_NumPacketsToSend;
 			size_t m_MTU;
 	};
 
@@ -297,6 +337,7 @@ namespace stream
 
 			Packet * NewPacket () { return m_PacketsPool.Acquire(); }
 			void DeletePacket (Packet * p) { return m_PacketsPool.Release(p); }
+			uint32_t GetRandom ();
 
 		private:
 
@@ -320,7 +361,8 @@ namespace stream
 
 			i2p::util::MemoryPool<Packet> m_PacketsPool;
 			i2p::util::MemoryPool<I2NPMessageBuffer<I2NP_MAX_SHORT_MESSAGE_SIZE> > m_I2NPMsgsPool;
-
+			uint64_t m_LastCleanupTime; // in seconds
+			
 		public:
 
 			i2p::data::GzipInflator m_Inflator;
@@ -336,7 +378,7 @@ namespace stream
 	void Stream::AsyncReceive (const Buffer& buffer, ReceiveHandler handler, int timeout)
 	{
 		auto s = shared_from_this();
-		m_Service.post ([s, buffer, handler, timeout](void)
+		boost::asio::post (m_Service, [s, buffer, handler, timeout](void)
 		{
 			if (!s->m_ReceiveQueue.empty () || s->m_Status == eStreamStatusReset)
 				s->HandleReceiveTimer (boost::asio::error::make_error_code (boost::asio::error::operation_aborted), buffer, handler, 0);
@@ -355,9 +397,9 @@ namespace stream
 	}
 
 	template<typename Buffer, typename ReceiveHandler>
-	void Stream::HandleReceiveTimer (const boost::system::error_code& ecode, const Buffer& buffer, ReceiveHandler handler, int remainingTimeout)
+	void Stream::HandleReceiveTimer (const boost::system::error_code& ecode, Buffer& buffer, ReceiveHandler handler, int remainingTimeout)
 	{
-		size_t received = ConcatenatePackets (boost::asio::buffer_cast<uint8_t *>(buffer), boost::asio::buffer_size(buffer));
+		size_t received = ConcatenatePackets ((uint8_t *)buffer.data (), buffer.size ());
 		if (received > 0)
 			handler (boost::system::error_code (), received);
 		else if (ecode == boost::asio::error::operation_aborted)