Bumped version to 0.7.2

Extend mitigation for usrsctp send after unregistering

.github/FUNDING.yml

@@ -0,0 +1 @@
+custom: ['https://paypal.me/paullouisageneau']

.github/workflows/build-gnutls.yml

@@ -1,4 +1,4 @@
-name: Build and test with GnuTLS
+name: Build with GnuTLS
 on:
   push:
     branches:
@@ -7,7 +7,7 @@ on:
     branches:
     - master
 jobs:
-  build-ubuntu:
+  build-linux:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
@@ -16,7 +16,7 @@ jobs:
     - name: submodules
       run: git submodule update --init --recursive
     - name: cmake
-      run: cmake -B build -DUSE_JUICE=1 -DUSE_GNUTLS=1
+      run: cmake -B build -DUSE_GNUTLS=1
     - name: make
       run: (cd build; make -j2)
     - name: test
@@ -30,10 +30,7 @@ jobs:
     - name: submodules
       run: git submodule update --init --recursive
     - name: cmake
-      run: cmake -B build -DUSE_JUICE=1 -DUSE_GNUTLS=1
-      env:
-# hack to bypass EPERM issue on sendto()
-        CFLAGS: -DJUICE_ENABLE_ADDRS_LOCALHOST
+      run: cmake -B build -DUSE_GNUTLS=1
     - name: make
       run: (cd build; make -j2)
     - name: test

.github/workflows/build-nice.yml

@@ -1,4 +1,4 @@
-name: Build and test with libnice
+name: Build with libnice
 on:
   push:
     branches:
@@ -7,7 +7,7 @@ on:
     branches:
     - master
 jobs:
-  build-ubuntu:
+  build-linux:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
@@ -16,7 +16,7 @@ jobs:
     - name: submodules
       run: git submodule update --init --recursive
     - name: cmake
-      run: cmake -B build -DUSE_JUICE=0 -DUSE_GNUTLS=1
+      run: cmake -B build -DUSE_GNUTLS=1 -DUSE_NICE=1
     - name: make
       run: (cd build; make -j2)
     - name: test

.github/workflows/build-openssl.yml

@@ -1,4 +1,4 @@
-name: Build and test with OpenSSL
+name: Build with OpenSSL
 on:
   push:
     branches:
@@ -7,7 +7,7 @@ on:
     branches:
     - master
 jobs:
-  build-ubuntu:
+  build-linux:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
@@ -16,7 +16,7 @@ jobs:
     - name: submodules
       run: git submodule update --init --recursive
     - name: cmake
-      run: cmake -B build -DUSE_JUICE=1 -DUSE_GNUTLS=0
+      run: cmake -B build -DUSE_GNUTLS=0
     - name: make
       run: (cd build; make -j2)
     - name: test
@@ -30,13 +30,29 @@ jobs:
     - name: submodules
       run: git submodule update --init --recursive
     - name: cmake
-      run: cmake -B build -DUSE_JUICE=1 -DUSE_GNUTLS=0
+      run: cmake -B build -DUSE_GNUTLS=0
       env:
         OPENSSL_ROOT_DIR: /usr/local/opt/openssl
         OPENSSL_LIBRARIES: /usr/local/opt/openssl/lib
-# hack to bypass EPERM issue on sendto()
-        CFLAGS: -DJUICE_ENABLE_ADDRS_LOCALHOST
     - name: make
       run: (cd build; make -j2)
     - name: test
       run: ./build/tests
+  build-windows:
+    runs-on: windows-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: ilammy/msvc-dev-cmd@v1
+    - name: install packages
+      run: choco install openssl
+    - name: submodules
+      run: git submodule update --init --recursive
+    - name: cmake
+      run: cmake -B build -G "NMake Makefiles" -DUSE_GNUTLS=0
+    - name: nmake
+      run: |
+        cd build
+        nmake
+    - name: test
+      run: build/tests.exe
+

.gitmodules

@@ -1,6 +1,6 @@
 [submodule "deps/plog"]
 	path = deps/plog
-	url = https://github.com/SergiusTheBest/plog
+	url = https://github.com/paullouisageneau/plog
 [submodule "usrsctp"]
 	path = deps/usrsctp
 	url = https://github.com/sctplab/usrsctp.git

CMakeLists.txt

@@ -1,12 +1,21 @@
 cmake_minimum_required(VERSION 3.7)
 project(libdatachannel
-	DESCRIPTION "WebRTC DataChannels Library"
-	VERSION 0.6.2
+	DESCRIPTION "WebRTC Data Channels Library"
+	VERSION 0.7.2
 	LANGUAGES CXX)
 
+# Options
 option(USE_GNUTLS "Use GnuTLS instead of OpenSSL" OFF)
-option(USE_JUICE "Use libjuice instead of libnice" OFF)
-option(RTC_ENABLE_WEBSOCKET "Build WebSocket support" ON)
+option(USE_NICE "Use libnice instead of libjuice" OFF)
+option(USE_SRTP "Enable SRTP for media support" OFF)
+option(NO_WEBSOCKET "Disable WebSocket support" OFF)
+option(NO_EXAMPLES "Disable examples" OFF)
+
+if(USE_NICE)
+	option(USE_JUICE "Use libjuice" OFF)
+else()
+	option(USE_JUICE "Use libjuice" ON)
+endif()
 
 if(USE_GNUTLS)
 	option(USE_NETTLE "Use Nettle instead of OpenSSL in libjuice" ON)
@@ -21,6 +30,8 @@ if(WIN32)
 	add_definitions(-DWIN32_LEAN_AND_MEAN)
 	if (MSVC)
 		add_definitions(-DNOMINMAX)
+		add_definitions(-D_CRT_SECURE_NO_WARNINGS)
+		add_definitions(-D_SILENCE_CXX17_CODECVT_HEADER_DEPRECATION_WARNING)
 	endif()
 endif()
 
@@ -40,12 +51,15 @@ set(LIBDATACHANNEL_SOURCES
 	${CMAKE_CURRENT_SOURCE_DIR}/src/rtc.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/src/sctptransport.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/src/tls.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/threadpool.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/processor.cpp
 )
 
 set(LIBDATACHANNEL_WEBSOCKET_SOURCES
 	${CMAKE_CURRENT_SOURCE_DIR}/src/base64.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/src/tcptransport.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/src/tlstransport.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/src/verifiedtlstransport.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/src/websocket.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/src/wstransport.cpp
 )
@@ -80,11 +94,11 @@ set(TESTS_SOURCES
 set(CMAKE_THREAD_PREFER_PTHREAD TRUE)
 set(THREADS_PREFER_PTHREAD_FLAG TRUE)
 find_package(Threads REQUIRED)
-find_package(SRTP)
 
 set(CMAKE_POLICY_DEFAULT_CMP0048 NEW)
 add_subdirectory(deps/plog)
 
+option(sctp_build_programs 0)
 add_subdirectory(deps/usrsctp EXCLUDE_FROM_ALL)
 if (MSYS OR MINGW)
 	target_compile_definitions(usrsctp PUBLIC -DSCTP_STDINT_INCLUDE=<stdint.h>)
@@ -97,7 +111,14 @@ endif()
 add_library(Usrsctp::Usrsctp ALIAS usrsctp)
 add_library(Usrsctp::UsrsctpStatic ALIAS usrsctp-static)
 
-if (RTC_ENABLE_WEBSOCKET)
+if (NO_WEBSOCKET)
+	add_library(datachannel SHARED
+		${LIBDATACHANNEL_SOURCES})
+	add_library(datachannel-static STATIC EXCLUDE_FROM_ALL
+		${LIBDATACHANNEL_SOURCES})
+	target_compile_definitions(datachannel PUBLIC RTC_ENABLE_WEBSOCKET=0)
+	target_compile_definitions(datachannel-static PUBLIC RTC_ENABLE_WEBSOCKET=0)
+else()
 	add_library(datachannel SHARED
 		${LIBDATACHANNEL_SOURCES}
 		${LIBDATACHANNEL_WEBSOCKET_SOURCES})
@@ -106,13 +127,6 @@ if (RTC_ENABLE_WEBSOCKET)
 		${LIBDATACHANNEL_WEBSOCKET_SOURCES})
 	target_compile_definitions(datachannel PUBLIC RTC_ENABLE_WEBSOCKET=1)
 	target_compile_definitions(datachannel-static PUBLIC RTC_ENABLE_WEBSOCKET=1)
-else()
-	add_library(datachannel SHARED
-		${LIBDATACHANNEL_SOURCES})
-	add_library(datachannel-static STATIC EXCLUDE_FROM_ALL
-		${LIBDATACHANNEL_SOURCES})
-	target_compile_definitions(datachannel PUBLIC RTC_ENABLE_WEBSOCKET=0)
-	target_compile_definitions(datachannel-static PUBLIC RTC_ENABLE_WEBSOCKET=0)
 endif()
 
 set_target_properties(datachannel PROPERTIES
@@ -139,7 +153,8 @@ if(WIN32)
 	target_link_libraries(datachannel-static PRIVATE wsock32 ws2_32) # winsock2
 endif()
 
-if(SRTP_FOUND)
+if(USE_SRTP)
+	find_package(SRTP REQUIRED)
 	if(NOT TARGET SRTP::SRTP)
 		add_library(SRTP::SRTP UNKNOWN IMPORTED)
 		set_target_properties(SRTP::SRTP PROPERTIES
@@ -178,18 +193,18 @@ else()
 	target_link_libraries(datachannel-static PRIVATE OpenSSL::SSL)
 endif()
 
-if (USE_JUICE)
-	add_subdirectory(deps/libjuice EXCLUDE_FROM_ALL)
-	target_compile_definitions(datachannel PRIVATE USE_JUICE=1)
-	target_compile_definitions(datachannel-static PRIVATE USE_JUICE=1)
-	target_link_libraries(datachannel PRIVATE LibJuice::LibJuiceStatic)
-	target_link_libraries(datachannel-static PRIVATE LibJuice::LibJuiceStatic)
-else()
+if (USE_NICE OR NOT USE_JUICE)
 	find_package(LibNice REQUIRED)
-	target_compile_definitions(datachannel PRIVATE USE_JUICE=0)
-	target_compile_definitions(datachannel-static PRIVATE USE_JUICE=0)
+	target_compile_definitions(datachannel PRIVATE USE_NICE=1)
+	target_compile_definitions(datachannel-static PRIVATE USE_NICE=1)
 	target_link_libraries(datachannel PRIVATE LibNice::LibNice)
 	target_link_libraries(datachannel-static PRIVATE LibNice::LibNice)
+else()
+	add_subdirectory(deps/libjuice EXCLUDE_FROM_ALL)
+	target_compile_definitions(datachannel PRIVATE USE_NICE=0)
+	target_compile_definitions(datachannel-static PRIVATE USE_NICE=0)
+	target_link_libraries(datachannel PRIVATE LibJuice::LibJuiceStatic)
+	target_link_libraries(datachannel-static PRIVATE LibJuice::LibJuiceStatic)
 endif()
 
 add_library(LibDataChannel::LibDataChannel ALIAS datachannel)
@@ -205,7 +220,11 @@ set_target_properties(datachannel-tests PROPERTIES
 	CXX_STANDARD 17)
 set_target_properties(datachannel-tests PROPERTIES OUTPUT_NAME tests)
 target_include_directories(datachannel-tests PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/src)
-target_link_libraries(datachannel-tests datachannel nlohmann_json::nlohmann_json)
+if(WIN32)
+	target_link_libraries(datachannel-tests datachannel-static) # DLL exports only the C API
+else()
+	target_link_libraries(datachannel-tests datachannel)
+endif()
 
 # Benchmark
 add_executable(datachannel-benchmark test/benchmark.cpp)
@@ -215,12 +234,18 @@ set_target_properties(datachannel-benchmark PROPERTIES
 set_target_properties(datachannel-benchmark PROPERTIES OUTPUT_NAME benchmark)
 target_compile_definitions(datachannel-benchmark PRIVATE BENCHMARK_MAIN=1)
 target_include_directories(datachannel-benchmark PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/src)
-target_link_libraries(datachannel-benchmark datachannel)
+if(WIN32)
+	target_link_libraries(datachannel-benchmark datachannel-static) # DLL exports only the C API
+else()
+	target_link_libraries(datachannel-benchmark datachannel)
+endif()
 
 # Examples
-set(JSON_BuildTests OFF CACHE INTERNAL "")
-add_subdirectory(deps/json)
-add_subdirectory(examples/client)
-add_subdirectory(examples/copy-paste)
-add_subdirectory(examples/copy-paste-capi)
+if(NOT NO_EXAMPLES)
+	set(JSON_BuildTests OFF CACHE INTERNAL "")
+	add_subdirectory(deps/json)
+	add_subdirectory(examples/client)
+	add_subdirectory(examples/copy-paste)
+	add_subdirectory(examples/copy-paste-capi)
+endif()
 

Jamfile

@@ -3,34 +3,40 @@ import feature : feature ;
 project libdatachannel ;
 path-constant CWD : . ;
 
+feature gnutls : off on : composite propagated ;
+feature.compose <gnutls>off
+    : <define>USE_GNUTLS=0 ;
+feature.compose <gnutls>on
+    : <define>USE_GNUTLS=1 ;
+
 lib libdatachannel
 	: # sources
 	[ glob ./src/*.cpp ]
 	: # requirements
 	<cxxstd>17
 	<include>./include/rtc
-	<define>USE_JUICE=1
+	<define>USE_NICE=0
 	<define>RTC_ENABLE_MEDIA=0
 	<define>RTC_ENABLE_WEBSOCKET=0
+	<toolset>msvc:<define>WIN32_LEAN_AND_MEAN
+	<toolset>msvc:<define>NOMINMAX
+	<toolset>msvc:<define>_CRT_SECURE_NO_WARNINGS
+	<toolset>msvc:<define>_SILENCE_CXX17_CODECVT_HEADER_DEPRECATION_WARNING
 	<library>/libdatachannel//usrsctp
 	<library>/libdatachannel//juice
 	<library>/libdatachannel//plog
+	<gnutls>on:<library>gnutls/<link>shared
+	<gnutls>off:<library>ssl
+	<gnutls>off:<library>crypto
 	: # default build
 	<link>static
 	: # usage requirements
 	<include>./include
 	<library>/libdatachannel//plog
-	<cxxflags>-pthread
-	<toolset>gcc:<cxxflags>"-Wno-pedantic -Wno-unused-parameter -Wno-unused-variable"
-	<toolset>clang:<cxxflags>"-Wno-pedantic -Wno-unused-parameter -Wno-unused-variable"
+	<toolset>gcc:<cxxflags>"-pthread -Wno-pedantic -Wno-unused-parameter -Wno-unused-variable"
+	<toolset>clang:<cxxflags>"-pthread -Wno-pedantic -Wno-unused-parameter -Wno-unused-variable"
 	;
 
-feature gnutls : off on : composite propagated ;
-feature.compose <gnutls>off
-    : <define>USE_GNUTLS=0 ;
-feature.compose <gnutls>on
-    : <define>USE_GNUTLS=1 ;
-
 alias plog
     : # no sources
     : # no build requirements
@@ -45,7 +51,16 @@ alias usrsctp
     : # no default build
     : # usage requirements
     <include>./deps/usrsctp/usrsctplib
-	<library>libusrsctp.a
+    <library>libusrsctp.a
+    ;
+
+alias usrsctp
+    : # no sources
+    : <toolset>msvc
+    : # no default build
+    : # usage requirements
+    <include>./deps/usrsctp/usrsctplib
+    <library>usrsctp.lib
     ;
 
 alias juice
@@ -54,35 +69,190 @@ alias juice
     : # no default build
     : # usage requirements
     <include>./deps/libjuice/include
-	<library>libjuice.a
+    <gnutls>on:<library>libjuice-gnutls.a
+    <gnutls>on:<library>nettle/<link>shared
+    <gnutls>off:<library>libjuice-openssl.a
+    ;
+
+alias juice
+    : # no sources
+    : <toolset>msvc
+    : # no default build
+    : # usage requirements
+    <include>./deps/libjuice/include
+    <library>juice-static.lib
     ;
 
 make libusrsctp.a : : @make_libusrsctp ;
+make usrsctp.lib : : @make_libusrsctp_msvc ;
+
+rule make_libusrsctp ( targets * : sources * : properties * )
+{
+	local VARIANT = [ feature.get-values <variant> : $(properties) ] ;
+	VARIANT on $(targets) = $(VARIANT) ;
+	BUILD_DIR on $(targets) = "build-$(VARIANT)" ;
+}
 actions make_libusrsctp
 {
-	(cd $(CWD)/deps/usrsctp && \
-		./bootstrap && \
-		./configure --enable-static --disable-debug CFLAGS="-fPIC -Wno-address-of-packed-member" && \
-		make)
-    cp $(CWD)/deps/usrsctp/usrsctplib/.libs/libusrsctp.a $(<)
+    (cd $(CWD)/deps/usrsctp && mkdir -p $(BUILD_DIR) && cd $(BUILD_DIR) && cmake -DCMAKE_BUILD_TYPE=$(VARIANT) -DCMAKE_C_FLAGS="-fPIC -Wno-unknown-warning-option -Wno-format-truncation" .. && make -j2 usrsctp-static)
+    cp $(CWD)/deps/usrsctp/$(BUILD_DIR)/usrsctplib/libusrsctp.a $(<)
+}
+rule make_libusrsctp_msvc ( targets * : sources * : properties * )
+{
+	local VARIANT = [ feature.get-values <variant> : $(properties) ] ;
+	VARIANT on $(targets) = $(VARIANT) ;
+	BUILD_DIR on $(targets) = "build-$(VARIANT)" ;
+}
+actions make_libusrsctp_msvc
+{
+	SET OLDD=%CD%
+    cd $(CWD)/deps/usrsctp
+    mkdir $(BUILD_DIR)
+    cd $(BUILD_DIR)
+    cmake -G "Visual Studio 16 2019" ..
+    msbuild usrsctplib.sln /property:Configuration=$(VARIANT)
+    cd %OLDD%
+    cp $(CWD)/deps/usrsctp/$(BUILD_DIR)/usrsctplib/Release/usrsctp.lib $(<)
 }
 
-make libjuice.a : : @make_libjuice ;
+make libjuice-gnutls.a : : @make_libjuice_gnutls ;
+make libjuice-openssl.a : : @make_libjuice_openssl ;
+make juice-static.lib : : @make_libjuice_msvc ;
 
-rule make_libjuice ( targets * : sources * : properties * )
+rule make_libjuice_gnutls ( targets * : sources * : properties * )
 {
-	if <crypto>gnutls in $(properties)
+	local VARIANT = [ feature.get-values <variant> : $(properties) ] ;
+	BUILD_DIR on $(targets) = "build-gnutls-$(VARIANT)" ;
+	CMAKEOPTS on $(targets) = "-DCMAKE_C_FLAGS=\"-fPIC\" -DCMAKE_BUILD_TYPE=$(VARIANT) -DUSE_NETTLE=1" ;
+}
+actions make_libjuice_gnutls
+{
+    (cd $(CWD)/deps/libjuice && mkdir -p $(BUILD_DIR) && cd $(BUILD_DIR) && cmake $(CMAKEOPTS) .. && make -j2 juice-static)
+    cp $(CWD)/deps/libjuice/$(BUILD_DIR)/libjuice-static.a $(<)
+}
+rule make_libjuice_openssl ( targets * : sources * : properties * )
+{
+	local VARIANT = [ feature.get-values <variant> : $(properties) ] ;
+	BUILD_DIR on $(targets) = "build-openssl-$(VARIANT)" ;
+	CMAKEOPTS on $(targets) = "-DCMAKE_C_FLAGS=\"-fPIC\" -DCMAKE_BUILD_TYPE=$(VARIANT) -DUSE_NETTLE=0" ;
+
+	local OPENSSL_INCLUDE = [ feature.get-values <openssl-include> : $(properties) ] ;
+	if <target-os>darwin in $(properties) && $(OPENSSL_INCLUDE) = ""
 	{
-		MAKEOPTS on $(targets) = "USE_NETTLE=1" ;
+		# on macOS, default to pick up openssl from the homebrew installation
+		# brew install openssl
+		OPENSSL_INCLUDE = /usr/local/opt/openssl/include ;
+	}
+
+	if $(OPENSSL_INCLUDE) != ""
+	{ CMAKEOPTS on $(targets) += " -DOPENSSL_ROOT_DIR=$(OPENSSL_INCLUDE)/.." ; }
+}
+actions make_libjuice_openssl
+{
+    (cd $(CWD)/deps/libjuice && mkdir -p $(BUILD_DIR) && cd $(BUILD_DIR) && cmake $(CMAKEOPTS) .. && make -j2 juice-static)
+    cp $(CWD)/deps/libjuice/$(BUILD_DIR)/libjuice-static.a $(<)
+}
+rule make_libjuice_msvc ( targets * : sources * : properties * )
+{
+	local VARIANT = [ feature.get-values <variant> : $(properties) ] ;
+	VARIANT on $(targets) = $(VARIANT) ;
+	if <gnutls>on in $(properties)
+	{
+		BUILD_DIR on $(targets) += "build-gnutls-$(VARIANT)" ;
+		CMAKEOPTS on $(targets) = "-DUSE_NETTLE=1" ;
 	}
 	else
 	{
-		MAKEOPTS on $(targets) = "USE_NETTLE=0" ;
+		BUILD_DIR on $(targets) += "build-openssl-$(VARIANT)" ;
+		CMAKEOPTS on $(targets) = "-DUSE_NETTLE=0" ;
 	}
 }
-actions make_libjuice
+actions make_libjuice_msvc
 {
-	(cd $(CWD)/deps/libjuice && make $(MAKEOPTS))
-    cp $(CWD)/deps/libjuice/libjuice.a $(<)
+	SET OLDD=%CD%
+    cd $(CWD)/deps/libjuice
+    mkdir $(BUILD_DIR)
+    cd $(BUILD_DIR)
+    cmake -G "Visual Studio 16 2019" $(CMAKEOPTS) ..
+    msbuild libjuice.sln /property:Configuration=$(VARIANT)
+    cd %OLDD%
+    cp $(CWD)/deps/libjuice/$(BUILD_DIR)/Release/juice-static.lib $(<)
 }
 
+# the search path to pick up the openssl libraries from. This is the <search>
+# property of those libraries
+rule openssl-lib-path ( properties * )
+{
+    local OPENSSL_LIB = [ feature.get-values <openssl-lib> : $(properties) ] ;
+
+    if <target-os>darwin in $(properties) && $(OPENSSL_LIB) = ""
+    {
+        # on macOS, default to pick up openssl from the homebrew installation
+        # brew install openssl
+        OPENSSL_LIB = /usr/local/opt/openssl/lib ;
+    }
+    else if <target-os>windows in $(properties) && $(OPENSSL_LIB) = ""
+    {
+        # on windows, assume openssl is installed to c:\OpenSSL-Win32
+        if <address-model>64 in $(properties)
+        { OPENSSL_LIB = c:\\OpenSSL-Win64\\lib ; }
+        else
+        { OPENSSL_LIB = c:\\OpenSSL-Win32\\lib ; }
+    }
+
+    local result ;
+    result += <search>$(OPENSSL_LIB) ;
+    return $(result) ;
+}
+
+# the include path to pick up openssl headers from. This is the
+# usage-requirement for the openssl-related libraries
+rule openssl-include-path ( properties * )
+{
+    local OPENSSL_INCLUDE = [ feature.get-values <openssl-include> : $(properties) ] ;
+
+    if <target-os>darwin in $(properties) && $(OPENSSL_INCLUDE) = ""
+    {
+        # on macOS, default to pick up openssl from the homebrew installation
+        # brew install openssl
+        OPENSSL_INCLUDE = /usr/local/opt/openssl/include ;
+    }
+    else if <target-os>windows in $(properties) && $(OPENSSL_INCLUDE) = ""
+    {
+        # on windows, assume openssl is installed to c:\OpenSSL-Win32
+        if <address-model>64 in $(properties)
+        { OPENSSL_INCLUDE = c:\\OpenSSL-Win64\\include ; }
+        else
+        { OPENSSL_INCLUDE = c:\\OpenSSL-Win32\\include ; }
+    }
+
+    local result ;
+    result += <include>$(OPENSSL_INCLUDE) ;
+    return $(result) ;
+}
+
+# libraries for OpenSSL on Windows
+lib advapi32 : : <name>advapi32 ;
+lib user32 : : <name>user32 ;
+lib shell32 : : <name>shell32 ;
+lib gdi32 : : <name>gdi32 ;
+lib bcrypt : : <name>bcrypt ;
+lib z : : <link>shared <name>z ;
+alias ssl-deps : advapi32 user32 shell32 gdi32 ;
+
+# OpenSSL on Windows
+lib crypto : ssl-deps : <toolset>msvc <openssl-version>1.1 <name>libcrypto
+    <conditional>@openssl-lib-path : : <conditional>@openssl-include-path ;
+lib ssl : ssl-deps : <toolset>msvc <openssl-version>1.1 <name>libssl <use>crypto
+    <conditional>@openssl-lib-path : : <conditional>@openssl-include-path ;
+
+# OpenSSL on other platforms
+lib crypto : : <name>crypto <use>z <conditional>@openssl-lib-path : :
+    <conditional>@openssl-include-path ;
+lib ssl : : <name>ssl <use>crypto <conditional>@openssl-lib-path : :
+    <conditional>@openssl-include-path ;
+
+# GnuTLS
+lib gnutls : : <link>shared <name>gnutls ;
+lib nettle : : <link>shared <name>nettle ;
+

Makefile

@@ -25,35 +25,35 @@ else
         LIBS+=openssl
 endif
 
-USE_JUICE ?= 0
-ifneq ($(USE_JUICE), 0)
-        CPPFLAGS+=-DUSE_JUICE=1
+USE_NICE ?= 0
+ifneq ($(USE_NICE), 0)
+        CPPFLAGS+=-DUSE_NICE=1
+        LIBS+=glib-2.0 gobject-2.0 nice
+else
+        CPPFLAGS+=-DUSE_NICE=0
         INCLUDES+=-I$(JUICE_DIR)/include
         LOCALLIBS+=libjuice.a
 ifneq ($(USE_GNUTLS), 0)
         LIBS+=nettle
 endif
-else
-        CPPFLAGS+=-DUSE_JUICE=0
-        LIBS+=glib-2.0 gobject-2.0 nice
 endif
 
-RTC_ENABLE_MEDIA ?= 0
-ifneq ($(RTC_ENABLE_MEDIA), 0)
+USE_SRTP ?= 0
+ifneq ($(USE_SRTP), 0)
         CPPFLAGS+=-DRTC_ENABLE_MEDIA=1
         LIBS+=srtp
 else
         CPPFLAGS+=-DRTC_ENABLE_MEDIA=0
 endif
 
-RTC_ENABLE_WEBSOCKET ?= 1
-ifneq ($(RTC_ENABLE_WEBSOCKET), 0)
+
+NO_WEBSOCKET ?= 0
+ifeq ($(NO_WEBSOCKET), 0)
         CPPFLAGS+=-DRTC_ENABLE_WEBSOCKET=1
 else
         CPPFLAGS+=-DRTC_ENABLE_WEBSOCKET=0
 endif
 
-
 INCLUDES+=$(shell pkg-config --cflags $(LIBS))
 LDLIBS+=$(LOCALLIBS) $(shell pkg-config --libs $(LIBS))
 

README.md

@@ -2,7 +2,7 @@
 
 libdatachannel is a standalone implementation of WebRTC Data Channels and WebSockets in C++17 with C bindings for POSIX platforms (including Linux and Apple macOS) and Microsoft Windows. It enables direct connectivity between native applications and web browsers without the pain of importing the entire WebRTC stack. The interface consists of simplified versions of the JavaScript WebRTC and WebSocket APIs present in browsers, in order to ease the design of cross-environment applications.
 It can be compiled with multiple backends:
-- The security layer can be provided through [GnuTLS](https://www.gnutls.org/) or [OpenSSL](https://www.openssl.org/).
+- The security layer can be provided through [OpenSSL](https://www.openssl.org/) or [GnuTLS](https://www.gnutls.org/).
 - The connectivity for WebRTC can be provided through my ad-hoc ICE library [libjuice](https://github.com/paullouisageneau/libjuice) as submodule or through [libnice](https://github.com/libnice/libnice).
 
 This projet is originally inspired by [librtcdcpp](https://github.com/chadnickbok/librtcdcpp), however it is a complete rewrite from scratch, because the messy architecture of librtcdcpp made solving its implementation issues difficult.
@@ -44,32 +44,60 @@ Features:
 
 ## Dependencies
 
+Dependencies:
 - GnuTLS: https://www.gnutls.org/ or OpenSSL: https://www.openssl.org/
 
-Optional:
-- libnice: https://nice.freedesktop.org/ (substituable with libjuice)
-- libSRTP: https://github.com/cisco/libsrtp
-
 Submodules:
 - libjuice: https://github.com/paullouisageneau/libjuice
 - usrsctp: https://github.com/sctplab/usrsctp
 
+Optional dependencies:
+- libnice: https://nice.freedesktop.org/ (only if selected as ICE backend instead of libjuice)
+- libSRTP: https://github.com/cisco/libsrtp (only necessary for supporting media transport)
+
 ## Building
-### Building with CMake (preferred)
+
+### Clone repository and submodules
 
 ```bash
+$ git clone https://github.com/paullouisageneau/libdatachannel.git
+$ cd libdatachannel
 $ git submodule update --init --recursive
-$ mkdir build
-$ cd build
-$ cmake -DUSE_JUICE=1 -DUSE_GNUTLS=1 ..
-$ make
 ```
 
-### Building directly with Make
+### Building with CMake
+
+The CMake library targets `libdatachannel` and `libdatachannel-static` respectively correspond to the shared and static libraries. The default target will build tests and examples. The option `USE_GNUTLS` allows to switch between OpenSSL (default) and GnuTLS, and the option `USE_NICE` allows to switch between libjuice as submodule (default) and libnice.
+
+On Windows, the DLL resulting from the shared library build only exposes the C API, use the static library for the C++ API.
+
+#### POSIX-compliant operating systems (including Linux and Apple macOS)
+```bash
+$ cmake -B build -DUSE_GNUTLS=1 -DUSE_NICE=0
+$ cd build
+$ make -j2
+```
+
+#### Microsoft Windows with MinGW cross-compilation
+```bash
+$ cmake -B build -DCMAKE_TOOLCHAIN_FILE=/usr/share/mingw/toolchain-x86_64-w64-mingw32.cmake # replace with your toolchain file
+$ cd build
+$ make -j2
+```
+
+#### Microsoft Windows with Microsoft Visual C++
+```bash
+$ cmake -B build -G "NMake Makefiles"
+$ cd build
+$ nmake
+```
+
+### Building directly with Make (Linux only)
+
+The option `USE_GNUTLS` allows to switch between OpenSSL (default) and GnuTLS, and the option `USE_NICE` allows to switch between libjuice as submodule (default) and libnice.
 
 ```bash
-$ git submodule update --init --recursive
-$ make USE_JUICE=1 USE_GNUTLS=1
+$ make USE_GNUTLS=1 USE_NICE=0
 ```
 
 ## Examples
@@ -168,3 +196,7 @@ ws->open("wss://my.websocket/service");
 
 ```
 
+## External resources
+- Rust wrappers for libdatachannel: [datachannel-rs](https://github.com/lerouxrgd/datachannel-rs)
+- WebAssembly wrappers compatible with libdatachannel: [datachannel-wasm](https://github.com/paullouisageneau/datachannel-wasm)
+

examples/README.md

@@ -1,10 +1,11 @@
 # Examples for libdatachannel
 
-This directory contains different WebRTC clients and WebSocket + JSON signaling servers.
+This directory contains different WebRTC clients and compatible WebSocket + JSON signaling servers.
 
 - [client](client) uses libdatachannel to implement WebRTC Data Channels with WebSocket signaling
 - [web](web) contains an equivalent implementation for web browsers and a node.js signaling server
 - [signaling-server-python](signaling-server-python) contains a similar signaling server in Python
+- [signaling-server-rust](signaling-server-rust) contains a similar signaling server in Rust (see [lerouxrgd/datachannel-rs](https://github.com/lerouxrgd/datachannel-rs) for Rust wrappers)
 
 Additionally, it contains two debugging tools for libdatachannel with copy-pasting as signaling:
 - [copy-paste](copy-paste) using the C++ API

examples/client/CMakeLists.txt

@@ -7,5 +7,11 @@ add_executable(datachannel-client main.cpp)
 set_target_properties(datachannel-client PROPERTIES
 	CXX_STANDARD 17
 	OUTPUT_NAME client)
+
+if(WIN32)
+	target_link_libraries(datachannel-client datachannel-static) # DLL exports only the C API
+else()
+	target_link_libraries(datachannel-client datachannel)
+endif()
 target_link_libraries(datachannel-client datachannel nlohmann_json)
 

examples/client/main.cpp

@@ -49,7 +49,7 @@ shared_ptr<PeerConnection> createPeerConnection(const Configuration &config,
 string randomId(size_t length);
 
 int main(int argc, char **argv) {
-	rtc::InitLogger(LogLevel::Warning);
+	rtc::InitLogger(LogLevel::Debug);
 
 	Configuration config;
 	config.iceServers.emplace_back("stun:stun.l.google.com:19302"); // change to your STUN server
@@ -212,7 +212,7 @@ string randomId(size_t length) {
 	    "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz");
 	string id(length, '0');
 	default_random_engine rng(random_device{}());
-	uniform_int_distribution<int> dist(0, characters.size() - 1);
+	uniform_int_distribution<int> dist(0, int(characters.size() - 1));
 	generate(id.begin(), id.end(), [&]() { return characters.at(dist(rng)); });
 	return id;
 }

examples/copy-paste-capi/CMakeLists.txt

@@ -2,7 +2,6 @@ cmake_minimum_required(VERSION 3.5.1)
 project(offerer C)
 
 set(CMAKE_C_STANDARD 11)
-set(CMAKE_C_FLAGS "-Wall -g -O2")
 
 add_executable(datachannel-copy-paste-capi-offerer offerer.c)
 set_target_properties(datachannel-copy-paste-capi-offerer PROPERTIES
@@ -13,3 +12,4 @@ add_executable(datachannel-copy-paste-capi-answerer answerer.c)
 set_target_properties(datachannel-copy-paste-capi-answerer PROPERTIES
 	OUTPUT_NAME answerer)
 target_link_libraries(datachannel-copy-paste-capi-answerer datachannel)
+

examples/copy-paste-capi/answerer.c

@@ -41,39 +41,31 @@ typedef struct {
         bool connected;
 } Peer;
 
-Peer *peer = NULL;
-
 static void dataChannelCallback(int dc, void *ptr);
-
 static void descriptionCallback(const char *sdp, const char *type, void *ptr);
-
 static void candidateCallback(const char *cand, const char *mid, void *ptr);
-
 static void stateChangeCallback(rtcState state, void *ptr);
-
 static void gatheringStateCallback(rtcGatheringState state, void *ptr);
-
 static void closedCallback(void *ptr);
-
 static void messageCallback(const char *message, int size, void *ptr);
-
 static void deletePeer(Peer *peer);
 
-int all_space(const char *str);
 char* state_print(rtcState state);
-char* rtcGatheringState_print(rtcState state);
+char *rtcGatheringState_print(rtcGatheringState state);
+
+int all_space(const char *str);
 
 int main(int argc, char **argv) {
-        rtcInitLogger(RTC_LOG_DEBUG);
+	rtcInitLogger(RTC_LOG_DEBUG, NULL);
 
-        // Create peer
-        rtcConfiguration config;
-        memset(&config, 0, sizeof(config));
+	// Create peer
+	rtcConfiguration config;
+	memset(&config, 0, sizeof(config));
 
-        Peer *peer = (Peer *)malloc(sizeof(Peer));
-        if (!peer) {
-		    fprintf(stderr, "Error allocating memory for peer\n");
-		    return -1;
+	Peer *peer = (Peer *)malloc(sizeof(Peer));
+	if (!peer) {
+		fprintf(stderr, "Error allocating memory for peer\n");
+		return -1;
 	    }
         memset(peer, 0, sizeof(Peer));
 
@@ -259,59 +251,59 @@ static void dataChannelCallback(int dc, void *ptr) {
                 printf("DataChannel %s: Received with label \"%s\"\n", "answerer", buffer);
 }
 
+char *state_print(rtcState state) {
+	char *str = NULL;
+	switch (state) {
+	case RTC_NEW:
+		str = "RTC_NEW";
+		break;
+	case RTC_CONNECTING:
+		str = "RTC_CONNECTING";
+		break;
+	case RTC_CONNECTED:
+		str = "RTC_CONNECTED";
+		break;
+	case RTC_DISCONNECTED:
+		str = "RTC_DISCONNECTED";
+		break;
+	case RTC_FAILED:
+		str = "RTC_FAILED";
+		break;
+	case RTC_CLOSED:
+		str = "RTC_CLOSED";
+		break;
+	default:
+		break;
+	}
+
+	return str;
+}
+
+char *rtcGatheringState_print(rtcGatheringState state) {
+	char *str = NULL;
+	switch (state) {
+	case RTC_GATHERING_NEW:
+		str = "RTC_GATHERING_NEW";
+		break;
+	case RTC_GATHERING_INPROGRESS:
+		str = "RTC_GATHERING_INPROGRESS";
+		break;
+	case RTC_GATHERING_COMPLETE:
+		str = "RTC_GATHERING_COMPLETE";
+		break;
+	default:
+		break;
+	}
+
+	return str;
+}
+
 int all_space(const char *str) {
-        while (*str) {
-                if (!isspace(*str++)) {
-                        return 0;
-                }
-        }
+	while (*str) {
+		if (!isspace(*str++)) {
+			return 0;
+		}
+	}
 
-	    return 1;
-}
-
-char* state_print(rtcState state) {
-        char *str = NULL;
-        switch (state) {
-        case RTC_NEW:
-                str = "RTC_NEW";
-                break;
-        case RTC_CONNECTING:
-                str = "RTC_CONNECTING";
-                break;
-        case RTC_CONNECTED:
-                str = "RTC_CONNECTED";
-                break;
-        case RTC_DISCONNECTED:
-                str = "RTC_DISCONNECTED";
-                break;
-        case RTC_FAILED:
-                str = "RTC_FAILED";
-                break;
-        case RTC_CLOSED:
-                str = "RTC_CLOSED";
-                break;
-        default:
-                break;
-        }
-
-        return str;
-}
-
-char* rtcGatheringState_print(rtcState state) {
-        char* str = NULL;
-        switch (state) {
-        case RTC_GATHERING_NEW:
-                str = "RTC_GATHERING_NEW";
-                break;
-        case RTC_GATHERING_INPROGRESS:
-                str = "RTC_GATHERING_INPROGRESS";
-                break;
-        case RTC_GATHERING_COMPLETE:
-                str = "RTC_GATHERING_COMPLETE";
-                break;
-        default:
-                break;
-        }
-
-        return str;
+	return 1;
 }

examples/copy-paste-capi/getline.h

@@ -1,10 +1,11 @@
 // Simple POSIX getline() implementation
 // This code is public domain
 
-#include "malloc.h"
-#include "stdio.h"
+#include <malloc.h>
+#include <stddef.h>
+#include <stdio.h>
 
-ssize_t getline(char **lineptr, size_t *n, FILE *stream) {
+int getline(char **lineptr, size_t *n, FILE *stream) {
 	if (!lineptr || !stream || !n)
 		return -1;
 
@@ -20,7 +21,7 @@ ssize_t getline(char **lineptr, size_t *n, FILE *stream) {
 		*n = 128;
 	}
 
-	size_t pos = 0;
+	int pos = 0;
 	while(c != EOF) {
         if (pos + 1 >= *n) {
             size_t new_size = *n + (*n >> 2);
@@ -45,4 +46,3 @@ ssize_t getline(char **lineptr, size_t *n, FILE *stream) {
     (*lineptr)[pos] = '\0';
     return pos;
 }
-

examples/copy-paste-capi/offerer.c

@@ -33,9 +33,6 @@ static void sleep(unsigned int secs) { Sleep(secs * 1000); }
 #include <unistd.h> // for sleep
 #endif
 
-char* state_print(rtcState state);
-char* rtcGatheringState_print(rtcState state);
-
 typedef struct {
         rtcState state;
         rtcGatheringState gatheringState;
@@ -44,37 +41,31 @@ typedef struct {
         bool connected;
 } Peer;
 
-Peer *peer = NULL;
-
 static void descriptionCallback(const char *sdp, const char *type, void *ptr);
-
 static void candidateCallback(const char *cand, const char *mid, void *ptr);
-
 static void stateChangeCallback(rtcState state, void *ptr);
-
 static void gatheringStateCallback(rtcGatheringState state, void *ptr);
-
 static void openCallback(void *ptr);
-
 static void closedCallback(void *ptr);
-
 static void messageCallback(const char *message, int size, void *ptr);
-
 static void deletePeer(Peer *peer);
 
+char *state_print(rtcState state);
+char *rtcGatheringState_print(rtcGatheringState state);
+
 int all_space(const char *str);
 
 int main(int argc, char **argv){
-        rtcInitLogger(RTC_LOG_DEBUG);
+	rtcInitLogger(RTC_LOG_DEBUG, NULL);
 
-        // Create peer
-        rtcConfiguration config;
-        memset(&config, 0, sizeof(config));
+	// Create peer
+	rtcConfiguration config;
+	memset(&config, 0, sizeof(config));
 
-        Peer *peer = (Peer *)malloc(sizeof(Peer));
-	    if (!peer) {
-		    fprintf(stderr, "Error allocating memory for peer\n");
-		    return -1;
+	Peer *peer = (Peer *)malloc(sizeof(Peer));
+	if (!peer) {
+		fprintf(stderr, "Error allocating memory for peer\n");
+		return -1;
 	    }
 	    memset(peer, 0, sizeof(Peer));
 
@@ -263,60 +254,59 @@ static void deletePeer(Peer *peer) {
         }
 }
 
+char *state_print(rtcState state) {
+	char *str = NULL;
+	switch (state) {
+	case RTC_NEW:
+		str = "RTC_NEW";
+		break;
+	case RTC_CONNECTING:
+		str = "RTC_CONNECTING";
+		break;
+	case RTC_CONNECTED:
+		str = "RTC_CONNECTED";
+		break;
+	case RTC_DISCONNECTED:
+		str = "RTC_DISCONNECTED";
+		break;
+	case RTC_FAILED:
+		str = "RTC_FAILED";
+		break;
+	case RTC_CLOSED:
+		str = "RTC_CLOSED";
+		break;
+	default:
+		break;
+	}
+
+	return str;
+}
+
+char *rtcGatheringState_print(rtcGatheringState state) {
+	char *str = NULL;
+	switch (state) {
+	case RTC_GATHERING_NEW:
+		str = "RTC_GATHERING_NEW";
+		break;
+	case RTC_GATHERING_INPROGRESS:
+		str = "RTC_GATHERING_INPROGRESS";
+		break;
+	case RTC_GATHERING_COMPLETE:
+		str = "RTC_GATHERING_COMPLETE";
+		break;
+	default:
+		break;
+	}
+
+	return str;
+}
+
 int all_space(const char *str) {
-        while (*str) {
-                if (!isspace(*str++)) {
-                        return 0;
-                }
-        }
+	while (*str) {
+		if (!isspace(*str++)) {
+			return 0;
+		}
+	}
 
-	    return 1;
-}
-
-char* state_print(rtcState state) {
-        char *str = NULL;
-        switch (state) {
-        case RTC_NEW:
-                str = "RTC_NEW";
-                break;
-        case RTC_CONNECTING:
-                str = "RTC_CONNECTING";
-                break;
-        case RTC_CONNECTED:
-                str = "RTC_CONNECTED";
-                break;
-        case RTC_DISCONNECTED:
-                str = "RTC_DISCONNECTED";
-                break;
-        case RTC_FAILED:
-                str = "RTC_FAILED";
-                break;
-        case RTC_CLOSED:
-                str = "RTC_CLOSED";
-                break;
-        default:
-                break;
-        }
-
-        return str;
-
-}
-
-char* rtcGatheringState_print(rtcState state) {
-        char* str = NULL;
-        switch (state) {
-        case RTC_GATHERING_NEW:
-                str = "RTC_GATHERING_NEW";
-                break;
-        case RTC_GATHERING_INPROGRESS:
-                str = "RTC_GATHERING_INPROGRESS";
-                break;
-        case RTC_GATHERING_COMPLETE:
-                str = "RTC_GATHERING_COMPLETE";
-                break;
-        default:
-                break;
-        }
-
-        return str;
+	return 1;
 }

examples/copy-paste/CMakeLists.txt

@@ -4,11 +4,19 @@ add_executable(datachannel-copy-paste-offerer offerer.cpp)
 set_target_properties(datachannel-copy-paste-offerer PROPERTIES
 	CXX_STANDARD 17
 	OUTPUT_NAME offerer)
-target_link_libraries(datachannel-copy-paste-offerer datachannel)
+if(WIN32)
+	target_link_libraries(datachannel-copy-paste-offerer datachannel-static) # DLL exports only the C API
+else()
+	target_link_libraries(datachannel-copy-paste-offerer datachannel)
+endif()
 
 add_executable(datachannel-copy-paste-answerer answerer.cpp)
 set_target_properties(datachannel-copy-paste-answerer PROPERTIES
 	CXX_STANDARD 17
 	OUTPUT_NAME answerer)
-target_link_libraries(datachannel-copy-paste-answerer datachannel)
+if(WIN32)
+	target_link_libraries(datachannel-copy-paste-answerer datachannel-static) # DLL exports only the C API
+else()
+	target_link_libraries(datachannel-copy-paste-answerer datachannel)
+endif()
 

examples/signaling-server-python/signaling-server.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 #
-# Signaling server example for libdatachannel
+# Python signaling server example for libdatachannel
 # Copyright (c) 2020 Paul-Louis Ageneau
 #
 # This program is free software: you can redistribute it and/or modify

examples/signaling-server-rust/Cargo.toml

@@ -1,18 +1,14 @@
 [package]
-name = "webrtc_server"
+name = "libdatachannel_signaling_server_example"
 version = "0.1.0"
-authors = ["Nico Chatzi <nico.chatzigianis@focusrite.com>"]
+authors = ["Paul-Louis Ageneau"]
 edition = "2018"
 
 [dependencies]
-rocket = "0.4.4"
-rocket_cors = "0.5.0"
-serde = "1.0"
-serde_json = "1.0"
-serde_derive = "1.0"
-bincode = "1.2.1"
+tokio = { version = "*", features = ["full"] }
+tungstenite = "*"
+tokio-tungstenite = "*"
+futures-util = "*"
+futures-channel = "*"
+json = "*"
 
-[dependencies.rocket_contrib]
-version = "0.4.4"
-default-features = false
-features = ["json"]

examples/signaling-server-rust/LICENSE

@@ -0,0 +1,661 @@
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU Affero General Public License is a free, copyleft license for
+software and other kinds of works, specifically designed to ensure
+cooperation with the community in the case of network server software.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+our General Public Licenses are intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  Developers that use our General Public Licenses protect your rights
+with two steps: (1) assert copyright on the software, and (2) offer
+you this License which gives you legal permission to copy, distribute
+and/or modify the software.
+
+  A secondary benefit of defending all users' freedom is that
+improvements made in alternate versions of the program, if they
+receive widespread use, become available for other developers to
+incorporate.  Many developers of free software are heartened and
+encouraged by the resulting cooperation.  However, in the case of
+software used on network servers, this result may fail to come about.
+The GNU General Public License permits making a modified version and
+letting the public access it on a server without ever releasing its
+source code to the public.
+
+  The GNU Affero General Public License is designed specifically to
+ensure that, in such cases, the modified source code becomes available
+to the community.  It requires the operator of a network server to
+provide the source code of the modified version running there to the
+users of that server.  Therefore, public use of a modified version, on
+a publicly accessible server, gives the public access to the source
+code of the modified version.
+
+  An older license, called the Affero General Public License and
+published by Affero, was designed to accomplish similar goals.  This is
+a different license, not a version of the Affero GPL, but Affero has
+released a new version of the Affero GPL which permits relicensing under
+this license.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU Affero General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
+License.  Each licensee is addressed as "you".  "Licensees" and
+"recipients" may be individuals or organizations.
+
+  To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy.  The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+  A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy.  Propagation includes copying,
+distribution (with or without modification), making available to the
+public, and in some countries other activities as well.
+
+  To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies.  Mere interaction with a user through
+a computer network, with no transfer of a copy, is not conveying.
+
+  An interactive user interface displays "Appropriate Legal Notices"
+to the extent that it includes a convenient and prominently visible
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examples/signaling-server-rust/src/main.rs

@@ -1,147 +1,108 @@
-#![feature(proc_macro_hygiene, decl_macro)]
+/*
+ * Rust signaling server example for libdatachannel
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
 
-#[macro_use]
-extern crate rocket;
-extern crate rocket_cors;
-#[macro_use]
-extern crate rocket_contrib;
-#[macro_use]
-extern crate serde_derive;
+extern crate tokio;
+extern crate tungstenite;
+extern crate futures_util;
+extern crate futures_channel;
+extern crate json;
 
-extern crate bincode;
+use std::env;
+use std::collections::HashMap;
+use std::sync::{Arc, Mutex};
 
-use std::sync::Mutex;
+use tokio::net::{TcpListener, TcpStream};
+use tungstenite::protocol::Message;
+use tungstenite::handshake::server::{Request, Response};
 
-use rocket_contrib::json::{Json, JsonValue};
+use futures_util::{future, pin_mut, StreamExt};
+use futures_util::stream::TryStreamExt;
+use futures_channel::mpsc;
 
-use rocket::http::Method; // 1.
+type Id = String;
+type Tx = mpsc::UnboundedSender<Message>;
+type ClientsMap = Arc<Mutex<HashMap<Id, Tx>>>;
 
-use rocket_cors::{
-    AllowedHeaders, AllowedOrigins, Error, // 2.
-    Cors, CorsOptions // 3.
-};
+async fn handle(clients: ClientsMap, stream: TcpStream) {
+    let mut client_id = Id::new();
+    let callback = |req: &Request, response: Response| {
+        let path: &str = req.uri().path();
+        let tokens: Vec<&str> = path.split('/').collect();
+        client_id = tokens[1].to_string();
+        return Ok(response);
+    };
 
-fn make_cors() -> Cors {
-    let allowed_origins = AllowedOrigins::some_exact(&[ // 4.
-        "http://localhost:8080",
-        "http://127.0.0.1:8080",
-        "http://localhost:8000",
-        "http://0.0.0.0:8000",
-    ]);
+    let websocket = tokio_tungstenite::accept_hdr_async(stream, callback)
+        .await.expect("WebSocket handshake failed");
+	println!("Client {} connected", &client_id);
 
-    CorsOptions { // 5.
-        allowed_origins,
-        allowed_methods: vec![Method::Get, Method::Post].into_iter().map(From::from).collect(), // 1.
-        allowed_headers: AllowedHeaders::some(&[
-            "Authorization",
-            "Accept",
-            "Content-Type",
-            "User-Agent",
-            "Access-Control-Allow-Origin", // 6.
-        ]),
-        allow_credentials: true,
-        ..Default::default()
-    }
-    .to_cors()
-    .expect("error while building CORS")
-}
+    let (tx, rx) = mpsc::unbounded();
+    clients.lock().unwrap().insert(client_id.clone(), tx);
 
-type Data = Mutex<String>;
+    let (outgoing, incoming) = websocket.split();
+    let forward = rx.map(Ok).forward(outgoing);
+    let process = incoming.try_for_each(|msg| {
+        if msg.is_text() {
+            let text = msg.to_text().unwrap();
+            println!("Client {} << {}", &client_id, &text);
 
-#[derive(Serialize, Deserialize, Clone, PartialEq, Debug)]
-pub struct ChannelData {
-    pub description: String,
-    pub candidate: String,
-}
+            // Parse
+            let mut content = json::parse(text).unwrap();
+            let remote_id = content["id"].to_string();
+            let mut locked = clients.lock().unwrap();
 
-impl Default for ChannelData {
-    fn default() -> ChannelData {
-        ChannelData {
-            description: "".to_owned(),
-            candidate: "".to_owned(),
+            match locked.get_mut(&remote_id) {
+                Some(remote) => {
+                    // Format
+                    content.insert("id", client_id.clone()).unwrap();
+                    let text = json::stringify(content);
+
+                    // Send to remote
+                    println!("Client {} >> {}", &remote_id, &text);
+                    remote.unbounded_send(Message::text(text)).unwrap();
+                },
+                _ => println!("Client {} not found", &remote_id),
+            }
         }
+        future::ok(())
+    });
+
+    pin_mut!(process, forward);
+    future::select(process, forward).await;
+
+    println!("Client {} disconnected", &client_id);
+    clients.lock().unwrap().remove(&client_id);
+}
+
+#[tokio::main]
+async fn main() -> Result<(), std::io::Error> {
+    let service = env::args().nth(1).unwrap_or("8000".to_string());
+    let endpoint = format!("127.0.0.1:{}", service);
+
+    let mut listener = TcpListener::bind(endpoint)
+    	.await.expect("Listener binding failed");
+
+    let clients = ClientsMap::new(Mutex::new(HashMap::new()));
+
+    while let Ok((stream, _)) = listener.accept().await {
+        tokio::spawn(handle(clients.clone(), stream));
     }
+
+    return Ok(())
 }
 
-#[post("/json", data = "<payload>")]
-fn new(payload: String, state: rocket::State<Data>) -> JsonValue {
-    let mut data = state.lock().expect("state locked");
-    *data = payload;
-    json!({ "status": "ok" })
-}
-
-#[get("/json")]
-fn get(state: rocket::State<Data>) -> Option<String> {
-    let data = state.lock().expect("state locked");
-    Some(data.clone())
-}
-
-#[catch(404)]
-fn not_found() -> JsonValue {
-    json!({
-        "status": "error",
-        "reason": "Resource was not found."
-    })
-}
-
-fn rocket() -> rocket::Rocket {
-    rocket::ignite()
-        .mount("/state", routes![new, get])
-        .register(catchers![not_found])
-        .manage(Mutex::new(String::new()))
-        .attach(make_cors())
-}
-
-fn main() {
-    rocket().launch();
-}
-
-#[cfg(test)]
-mod test {
-    use super::*;
-
-    use rocket::http::{ContentType, Status};
-    use rocket::local::Client;
-
-    #[test]
-    fn test_save_load() {
-        let data = ChannelData {
-            description: "v=0
-            o=- 3294530454 0 IN IP4 127.0.0.1
-            s=-
-            t=0 0
-            a=group:BUNDLE 0
-            m=application 9 UDP/DTLS/SCTP webrtc-datachannel
-            c=IN IP4 0.0.0.0
-            a=ice-ufrag:ntAX
-            a=ice-pwd:H59OKuJgItlvJZR5E78QYo
-            a=ice-options:trickle
-            a=mid:0
-            a=setup:actpass
-            a=dtls-id:1
-            a=fingerprint:sha-256 72:0E:8D:8C:9F:A2:E4:40:E7:2E:23:EF:F6:E7:89:94:0F:6B:78:9A:36:61:43:2C:6A:45:30:62:CB:68:B3:73
-            a=sctp-port:5000
-            a=max-message-size:262144".to_owned(),
-            candidate: "a=candidate:1 1 UDP 2122317823 10.0.1.83 55100 typ host".to_owned(),
-        };
-        println!("{:?}", data);
-        let client = Client::new(rocket()).unwrap();
-
-        let res = client
-            .post("/state/json")
-            .header(ContentType::JSON)
-            .remote("127.0.0.1:8000".parse().unwrap())
-            .body(serde_json::to_vec(&data).unwrap())
-            .dispatch();
-        assert_eq!(res.status(), Status::Ok);
-
-        let mut res = client
-            .get("/state/json")
-            .header(ContentType::JSON)
-            .dispatch();
-        assert_eq!(res.status(), Status::Ok);
-
-        let body = res.body().unwrap().into_string().unwrap();
-        println!("{}", body);
-    }
-}

include/rtc/datachannel.hpp

@@ -108,8 +108,8 @@ template <typename Iterator> bool DataChannel::sendBuffer(Iterator first, Iterat
 	auto message = std::make_shared<Message>(size);
 	auto pos = message->begin();
 	for (Iterator it = first; it != last; ++it) {
-		auto [bytes, size] = to_bytes(*it);
-		pos = std::copy(bytes, bytes + size, pos);
+		auto [bytes, len] = to_bytes(*it);
+		pos = std::copy(bytes, bytes + len, pos);
 	}
 	return outgoing(message);
 }

include/rtc/description.hpp

@@ -49,6 +49,7 @@ public:
 	bool ended() const;
 
 	void hintType(Type type);
+	void setDataMid(string mid);
 	void setFingerprint(string fingerprint);
 	void setSctpPort(uint16_t port);
 	void setMaxMessageSize(size_t size);
@@ -86,7 +87,7 @@ private:
 		string mid;
 		std::vector<string> attributes;
 	};
-	std::map<string, Media> mMedia; // by mid
+	std::map<int, Media> mMedia; // by m-line index
 
 	// Candidates
 	std::vector<Candidate> mCandidates;

include/rtc/include.hpp

@@ -64,6 +64,8 @@ const uint16_t DEFAULT_SCTP_PORT = 5000; // SCTP port to use by default
 const size_t DEFAULT_MAX_MESSAGE_SIZE = 65536;    // Remote max message size if not specified in SDP
 const size_t LOCAL_MAX_MESSAGE_SIZE = 256 * 1024; // Local max message size
 
+const int THREADPOOL_SIZE = 4; // Number of threads in the global thread pool
+
 // overloaded helper
 template <class... Ts> struct overloaded : Ts... { using Ts::operator()...; };
 template <class... Ts> overloaded(Ts...)->overloaded<Ts...>;
@@ -82,9 +84,24 @@ template <typename F, typename T, typename... Args> auto weak_bind(F &&f, T *t,
 template <typename... P> class synchronized_callback {
 public:
 	synchronized_callback() = default;
+	synchronized_callback(synchronized_callback &&cb) { *this = std::move(cb); }
+	synchronized_callback(const synchronized_callback &cb) { *this = cb; }
 	synchronized_callback(std::function<void(P...)> func) { *this = std::move(func); }
 	~synchronized_callback() { *this = nullptr; }
 
+	synchronized_callback &operator=(synchronized_callback &&cb) {
+		std::scoped_lock lock(mutex, cb.mutex);
+		callback = std::move(cb.callback);
+		cb.callback = nullptr;
+		return *this;
+	}
+
+	synchronized_callback &operator=(const synchronized_callback &cb) {
+		std::scoped_lock lock(mutex, cb.mutex);
+		callback = cb.callback;
+		return *this;
+	}
+
 	synchronized_callback &operator=(std::function<void(P...)> func) {
 		std::lock_guard lock(mutex);
 		callback = std::move(func);

include/rtc/init.hpp

@@ -25,8 +25,7 @@
 
 namespace rtc {
 
-class Init;
-using init_token = std::shared_ptr<Init>;
+using init_token = std::shared_ptr<void>;
 
 class Init {
 public:
@@ -39,9 +38,10 @@ public:
 private:
 	Init();
 
-	static std::weak_ptr<Init> Weak;
-	static init_token Global;
-	static std::mutex Mutex;
+	static std::weak_ptr<void> Weak;
+	static std::shared_ptr<void> *Global;
+	static bool Initialized;
+	static std::recursive_mutex Mutex;
 };
 
 inline void Preload() { Init::Preload(); }

include/rtc/message.hpp

@@ -37,6 +37,8 @@ struct Message : binary {
 	Message(Iterator begin_, Iterator end_, Type type_ = Binary)
 	    : binary(begin_, end_), type(type_) {}
 
+	Message(binary &&data, Type type_ = Binary) : binary(std::move(data)), type(type_) {}
+
 	Type type;
 	unsigned int stream = 0;
 	std::shared_ptr<Reliability> reliability;
@@ -68,6 +70,15 @@ inline message_ptr make_message(size_t size, Message::Type type = Message::Binar
 	return message;
 }
 
+inline message_ptr make_message(binary &&data, Message::Type type = Message::Binary,
+                                unsigned int stream = 0,
+                                std::shared_ptr<Reliability> reliability = nullptr) {
+	auto message = std::make_shared<Message>(std::move(data), type);
+	message->stream = stream;
+	message->reliability = reliability;
+	return message;
+}
+
 } // namespace rtc
 
 #endif

include/rtc/peerconnection.hpp

@@ -41,6 +41,7 @@
 namespace rtc {
 
 class Certificate;
+class Processor;
 class IceTransport;
 class DtlsTransport;
 class SctpTransport;
@@ -101,7 +102,7 @@ public:
 	// Media
 	bool hasMedia() const;
 	void sendMedia(const binary &packet);
-	void send(const byte *packet, size_t size);
+	void sendMedia(const byte *packet, size_t size);
 
 	void onMedia(std::function<void(const binary &packet)> callback);
 
@@ -139,10 +140,10 @@ private:
 
 	void outgoingMedia(message_ptr message);
 
+	const init_token mInitToken = Init::Token();
 	const Configuration mConfig;
 	const future_certificate_ptr mCertificate;
-
-	init_token mInitToken = Init::Token();
+	const std::unique_ptr<Processor> mProcessor;
 
 	std::optional<Description> mLocalDescription, mRemoteDescription;
 	mutable std::mutex mLocalDescriptionMutex, mRemoteDescriptionMutex;

include/rtc/rtc.h

@@ -23,9 +23,11 @@
 extern "C" {
 #endif
 
-#include <stdint.h>
-
-// libdatachannel C API
+#ifdef _WIN32
+#define RTC_EXPORT __declspec(dllexport)
+#else
+#define RTC_EXPORT
+#endif
 
 #ifndef RTC_ENABLE_MEDIA
 #define RTC_ENABLE_MEDIA 1
@@ -35,6 +37,11 @@ extern "C" {
 #define RTC_ENABLE_WEBSOCKET 1
 #endif
 
+#include <stdbool.h>
+#include <stdint.h>
+
+// libdatachannel C API
+
 typedef enum {
 	RTC_NEW = 0,
 	RTC_CONNECTING = 1,
@@ -71,71 +78,77 @@ typedef struct {
 	uint16_t portRangeEnd;
 } rtcConfiguration;
 
-typedef void (*dataChannelCallbackFunc)(int dc, void *ptr);
-typedef void (*descriptionCallbackFunc)(const char *sdp, const char *type, void *ptr);
-typedef void (*candidateCallbackFunc)(const char *cand, const char *mid, void *ptr);
-typedef void (*stateChangeCallbackFunc)(rtcState state, void *ptr);
-typedef void (*gatheringStateCallbackFunc)(rtcGatheringState state, void *ptr);
-typedef void (*openCallbackFunc)(void *ptr);
-typedef void (*closedCallbackFunc)(void *ptr);
-typedef void (*errorCallbackFunc)(const char *error, void *ptr);
-typedef void (*messageCallbackFunc)(const char *message, int size, void *ptr);
-typedef void (*bufferedAmountLowCallbackFunc)(void *ptr);
-typedef void (*availableCallbackFunc)(void *ptr);
+typedef void (*rtcLogCallbackFunc)(rtcLogLevel level, const char *message);
+typedef void (*rtcDataChannelCallbackFunc)(int dc, void *ptr);
+typedef void (*rtcDescriptionCallbackFunc)(const char *sdp, const char *type, void *ptr);
+typedef void (*rtcCandidateCallbackFunc)(const char *cand, const char *mid, void *ptr);
+typedef void (*rtcStateChangeCallbackFunc)(rtcState state, void *ptr);
+typedef void (*rtcGatheringStateCallbackFunc)(rtcGatheringState state, void *ptr);
+typedef void (*rtcOpenCallbackFunc)(void *ptr);
+typedef void (*rtcClosedCallbackFunc)(void *ptr);
+typedef void (*rtcErrorCallbackFunc)(const char *error, void *ptr);
+typedef void (*rtcMessageCallbackFunc)(const char *message, int size, void *ptr);
+typedef void (*rtcBufferedAmountLowCallbackFunc)(void *ptr);
+typedef void (*rtcAvailableCallbackFunc)(void *ptr);
 
 // Log
-void rtcInitLogger(rtcLogLevel level);
+RTC_EXPORT void rtcInitLogger(rtcLogLevel level, rtcLogCallbackFunc cb); // NULL cb to log to stdout
 
 // User pointer
-void rtcSetUserPointer(int id, void *ptr);
+RTC_EXPORT void rtcSetUserPointer(int id, void *ptr);
 
 // PeerConnection
-int rtcCreatePeerConnection(const rtcConfiguration *config); // returns pc id
-int rtcDeletePeerConnection(int pc);
+RTC_EXPORT int rtcCreatePeerConnection(const rtcConfiguration *config); // returns pc id
+RTC_EXPORT int rtcDeletePeerConnection(int pc);
 
-int rtcSetDataChannelCallback(int pc, dataChannelCallbackFunc cb);
-int rtcSetLocalDescriptionCallback(int pc, descriptionCallbackFunc cb);
-int rtcSetLocalCandidateCallback(int pc, candidateCallbackFunc cb);
-int rtcSetStateChangeCallback(int pc, stateChangeCallbackFunc cb);
-int rtcSetGatheringStateChangeCallback(int pc, gatheringStateCallbackFunc cb);
+RTC_EXPORT int rtcSetDataChannelCallback(int pc, rtcDataChannelCallbackFunc cb);
+RTC_EXPORT int rtcSetLocalDescriptionCallback(int pc, rtcDescriptionCallbackFunc cb);
+RTC_EXPORT int rtcSetLocalCandidateCallback(int pc, rtcCandidateCallbackFunc cb);
+RTC_EXPORT int rtcSetStateChangeCallback(int pc, rtcStateChangeCallbackFunc cb);
+RTC_EXPORT int rtcSetGatheringStateChangeCallback(int pc, rtcGatheringStateCallbackFunc cb);
 
-int rtcSetRemoteDescription(int pc, const char *sdp, const char *type);
-int rtcAddRemoteCandidate(int pc, const char *cand, const char *mid);
+RTC_EXPORT int rtcSetRemoteDescription(int pc, const char *sdp, const char *type);
+RTC_EXPORT int rtcAddRemoteCandidate(int pc, const char *cand, const char *mid);
 
-int rtcGetLocalAddress(int pc, char *buffer, int size);
-int rtcGetRemoteAddress(int pc, char *buffer, int size);
+RTC_EXPORT int rtcGetLocalAddress(int pc, char *buffer, int size);
+RTC_EXPORT int rtcGetRemoteAddress(int pc, char *buffer, int size);
 
 // DataChannel
-int rtcCreateDataChannel(int pc, const char *label); // returns dc id
-int rtcDeleteDataChannel(int dc);
+RTC_EXPORT int rtcCreateDataChannel(int pc, const char *label); // returns dc id
+RTC_EXPORT int rtcDeleteDataChannel(int dc);
 
-int rtcGetDataChannelLabel(int dc, char *buffer, int size);
+RTC_EXPORT int rtcGetDataChannelLabel(int dc, char *buffer, int size);
 
 // WebSocket
 #if RTC_ENABLE_WEBSOCKET
-int rtcCreateWebSocket(const char *url); // returns ws id
-int rtcDeleteWebsocket(int ws);
+typedef struct {
+	bool disableTlsVerification; // if true, don't verify the TLS certificate
+} rtcWsConfiguration;
+
+RTC_EXPORT int rtcCreateWebSocket(const char *url); // returns ws id
+RTC_EXPORT int rtcCreateWebSocketEx(const char *url, const rtcWsConfiguration *config);
+RTC_EXPORT int rtcDeleteWebsocket(int ws);
 #endif
 
 // DataChannel and WebSocket common API
-int rtcSetOpenCallback(int id, openCallbackFunc cb);
-int rtcSetClosedCallback(int id, closedCallbackFunc cb);
-int rtcSetErrorCallback(int id, errorCallbackFunc cb);
-int rtcSetMessageCallback(int id, messageCallbackFunc cb);
-int rtcSendMessage(int id, const char *data, int size);
+RTC_EXPORT int rtcSetOpenCallback(int id, rtcOpenCallbackFunc cb);
+RTC_EXPORT int rtcSetClosedCallback(int id, rtcClosedCallbackFunc cb);
+RTC_EXPORT int rtcSetErrorCallback(int id, rtcErrorCallbackFunc cb);
+RTC_EXPORT int rtcSetMessageCallback(int id, rtcMessageCallbackFunc cb);
+RTC_EXPORT int rtcSendMessage(int id, const char *data, int size);
 
-int rtcGetBufferedAmount(int id); // total size buffered to send
-int rtcSetBufferedAmountLowThreshold(int id, int amount);
-int rtcSetBufferedAmountLowCallback(int id, bufferedAmountLowCallbackFunc cb);
+RTC_EXPORT int rtcGetBufferedAmount(int id); // total size buffered to send
+RTC_EXPORT int rtcSetBufferedAmountLowThreshold(int id, int amount);
+RTC_EXPORT int rtcSetBufferedAmountLowCallback(int id, rtcBufferedAmountLowCallbackFunc cb);
 
 // DataChannel and WebSocket common extended API
-int rtcGetAvailableAmount(int id); // total size available to receive
-int rtcSetAvailableCallback(int id, availableCallbackFunc cb);
-int rtcReceiveMessage(int id, char *buffer, int *size);
+RTC_EXPORT int rtcGetAvailableAmount(int id); // total size available to receive
+RTC_EXPORT int rtcSetAvailableCallback(int id, rtcAvailableCallbackFunc cb);
+RTC_EXPORT int rtcReceiveMessage(int id, char *buffer, int *size);
 
 // Optional preload and cleanup
-void rtcPreload();
-void rtcCleanup();
+RTC_EXPORT void rtcPreload(void);
+RTC_EXPORT void rtcCleanup(void);
 
 #ifdef __cplusplus
 } // extern "C"

include/rtc/websocket.hpp

@@ -47,7 +47,11 @@ public:
 		Closed = 3,
 	};
 
-	WebSocket();
+	struct Configuration {
+		bool disableTlsVerification = false; // if true, don't verify the TLS certificate
+	};
+
+	WebSocket(std::optional<Configuration> config = nullopt);
 	~WebSocket();
 
 	State readyState() const;
@@ -82,6 +86,7 @@ private:
 	std::shared_ptr<WsTransport> mWsTransport;
 	std::recursive_mutex mInitMutex;
 
+	const Configuration mConfig;
 	string mScheme, mHost, mHostname, mService, mPath;
 	std::atomic<State> mState = State::Closed;
 

src/base64.cpp

@@ -42,7 +42,7 @@ string to_base64(const binary &data) {
 		i += 3;
 	}
 
-	int left = data.size() - i;
+	int left = int(data.size() - i);
 	if (left) {
 		auto d0 = to_integer<uint8_t>(data[i]);
 		out += tab[d0 >> 2];

src/candidate.cpp

@@ -28,6 +28,7 @@
 #else
 #include <netdb.h>
 #include <sys/socket.h>
+#include <netinet/in.h>
 #endif
 
 #include <sys/types.h>
@@ -98,8 +99,8 @@ bool Candidate::resolve(ResolveMode mode) {
 					// Rewrite the candidate
 					char nodebuffer[MAX_NUMERICNODE_LEN];
 					char servbuffer[MAX_NUMERICSERV_LEN];
-					if (getnameinfo(p->ai_addr, p->ai_addrlen, nodebuffer, MAX_NUMERICNODE_LEN,
-					                servbuffer, MAX_NUMERICSERV_LEN,
+					if (getnameinfo(p->ai_addr, socklen_t(p->ai_addrlen), nodebuffer,
+					                MAX_NUMERICNODE_LEN, servbuffer, MAX_NUMERICSERV_LEN,
 					                NI_NUMERICHOST | NI_NUMERICSERV) == 0) {
 						const char sp{' '};
 						std::ostringstream oss;
@@ -107,8 +108,9 @@ bool Candidate::resolve(ResolveMode mode) {
 						oss << sp << nodebuffer << sp << servbuffer << sp << "typ" << sp << type;
 						oss << left;
 						mCandidate = oss.str();
+						mIsResolved = true;
 						PLOG_VERBOSE << "Resolved candidate: " << mCandidate;
-						return mIsResolved = true;
+						break;
 					}
 				}
 		}
@@ -116,7 +118,7 @@ bool Candidate::resolve(ResolveMode mode) {
 		freeaddrinfo(result);
 	}
 
-	return false;
+	return mIsResolved;
 }
 
 bool Candidate::isResolved() const { return mIsResolved; }

src/certificate.cpp

@@ -17,6 +17,7 @@
  */
 
 #include "certificate.hpp"
+#include "threadpool.hpp"
 
 #include <cassert>
 #include <chrono>
@@ -132,14 +133,14 @@ namespace rtc {
 
 Certificate::Certificate(string crt_pem, string key_pem) {
 	BIO *bio = BIO_new(BIO_s_mem());
-	BIO_write(bio, crt_pem.data(), crt_pem.size());
+	BIO_write(bio, crt_pem.data(), int(crt_pem.size()));
 	mX509 = shared_ptr<X509>(PEM_read_bio_X509(bio, nullptr, 0, 0), X509_free);
 	BIO_free(bio);
 	if (!mX509)
 		throw std::invalid_argument("Unable to import certificate PEM");
 
 	bio = BIO_new(BIO_s_mem());
-	BIO_write(bio, key_pem.data(), key_pem.size());
+	BIO_write(bio, key_pem.data(), int(key_pem.size()));
 	mPKey = shared_ptr<EVP_PKEY>(PEM_read_bio_PrivateKey(bio, nullptr, 0, 0), EVP_PKEY_free);
 	BIO_free(bio);
 	if (!mPKey)
@@ -201,8 +202,8 @@ certificate_ptr make_certificate_impl(string commonName) {
 	auto *commonNameBytes =
 	    reinterpret_cast<unsigned char *>(const_cast<char *>(commonName.c_str()));
 
-	if (!X509_gmtime_adj(X509_get_notBefore(x509.get()), 3600 * -1) ||
-	    !X509_gmtime_adj(X509_get_notAfter(x509.get()), 3600 * 24 * 365) ||
+	if (!X509_gmtime_adj(X509_getm_notBefore(x509.get()), 3600 * -1) ||
+	    !X509_gmtime_adj(X509_getm_notAfter(x509.get()), 3600 * 24 * 365) ||
 	    !X509_set_version(x509.get(), 1) || !X509_set_pubkey(x509.get(), pkey.get()) ||
 	    !BN_pseudo_rand(serial_number.get(), serialSize, 0, 0) ||
 	    !BN_to_ASN1_INTEGER(serial_number.get(), X509_get_serialNumber(x509.get())) ||
@@ -230,19 +231,6 @@ namespace rtc {
 
 namespace {
 
-// Helper function roughly equivalent to std::async with policy std::launch::async
-// since std::async might be unreliable on some platforms (e.g. Mingw32 on Windows)
-template <class F, class... Args>
-std::future<std::result_of_t<std::decay_t<F>(std::decay_t<Args>...)>> thread_call(F &&f,
-                                                                                  Args &&... args) {
-	using R = std::invoke_result_t<std::decay_t<F>, std::decay_t<Args>...>;
-	std::packaged_task<R()> task(std::bind(f, std::forward<Args>(args)...));
-	std::future<R> future = task.get_future();
-	std::thread t(std::move(task));
-	t.detach();
-	return future;
-}
-
 static std::unordered_map<string, future_certificate_ptr> CertificateCache;
 static std::mutex CertificateCacheMutex;
 
@@ -254,7 +242,7 @@ future_certificate_ptr make_certificate(string commonName) {
 	if (auto it = CertificateCache.find(commonName); it != CertificateCache.end())
 		return it->second;
 
-	auto future = thread_call(make_certificate_impl, commonName);
+	auto future = ThreadPool::Instance().enqueue(make_certificate_impl, commonName);
 	auto shared = future.share();
 	CertificateCache.emplace(std::move(commonName), shared);
 	return shared;

src/datachannel.cpp

@@ -96,7 +96,7 @@ void DataChannel::close() {
 	mIsClosed = true;
 	if (mIsOpen.exchange(false))
 		if (auto transport = mSctpTransport.lock())
-			transport->close(mStream);
+			transport->closeStream(mStream);
 
 	mSctpTransport.reset();
 	resetCallbacks();
@@ -186,8 +186,8 @@ void DataChannel::open(shared_ptr<SctpTransport> transport) {
 	open.channelType = mReliability->type;
 	open.priority = htons(0);
 	open.reliabilityParameter = htonl(reliabilityParameter);
-	open.labelLength = htons(mLabel.size());
-	open.protocolLength = htons(mProtocol.size());
+	open.labelLength = htons(uint16_t(mLabel.size()));
+	open.protocolLength = htons(uint16_t(mProtocol.size()));
 
 	auto end = reinterpret_cast<char *>(buffer.data() + sizeof(OpenMessage));
 	std::copy(mLabel.begin(), mLabel.end(), end);

src/description.cpp

@@ -26,6 +26,7 @@
 
 using std::size_t;
 using std::string;
+using std::chrono::system_clock;
 
 namespace {
 
@@ -54,7 +55,7 @@ Description::Description(const string &sdp, Type type, Role role)
 	mData.mid = "data";
 	hintType(type);
 
-	auto seed = std::chrono::system_clock::now().time_since_epoch().count();
+	auto seed = static_cast<unsigned int>(system_clock::now().time_since_epoch().count());
 	std::default_random_engine generator(seed);
 	std::uniform_int_distribution<uint32_t> uniform;
 	mSessionId = std::to_string(uniform(generator));
@@ -62,6 +63,7 @@ Description::Description(const string &sdp, Type type, Role role)
 	std::istringstream ss(sdp);
 	std::optional<Media> currentMedia;
 
+	int mlineIndex = 0;
 	bool finished;
 	do {
 		string line;
@@ -75,7 +77,9 @@ Description::Description(const string &sdp, Type type, Role role)
 					if (currentMedia->type == "application")
 						mData.mid = currentMedia->mid;
 					else
-						mMedia.emplace(currentMedia->mid, std::move(*currentMedia));
+						mMedia.emplace(mlineIndex, std::move(*currentMedia));
+
+					++mlineIndex;
 
 				} else if (line.find(" ICE/SDP") != string::npos) {
 					PLOG_WARNING << "SDP \"m=\" line has no corresponding mid, ignoring";
@@ -112,7 +116,8 @@ Description::Description(const string &sdp, Type type, Role role)
 				if (match_prefix(value, "sha-256 ")) {
 					mFingerprint = value.substr(8);
 					std::transform(mFingerprint->begin(), mFingerprint->end(),
-					               mFingerprint->begin(), [](char c) { return std::toupper(c); });
+					               mFingerprint->begin(),
+					               [](char c) { return char(std::toupper(c)); });
 				} else {
 					PLOG_WARNING << "Unknown SDP fingerprint type: " << value;
 				}
@@ -161,6 +166,8 @@ void Description::hintType(Type type) {
 	}
 }
 
+void Description::setDataMid(string mid) { mData.mid = mid; }
+
 void Description::setFingerprint(string fingerprint) {
 	mFingerprint.emplace(std::move(fingerprint));
 }
@@ -185,11 +192,8 @@ std::vector<Candidate> Description::extractCandidates() {
 bool Description::hasMedia() const { return !mMedia.empty(); }
 
 void Description::addMedia(const Description &source) {
-	for (auto [mid, media] : source.mMedia)
-		if (mid != mData.mid)
-			mMedia.emplace(mid, media);
-		else
-			PLOG_WARNING << "Media mid \"" << mid << "\" is the same as data mid, ignoring";
+	for (auto p : source.mMedia)
+		mMedia.emplace(p);
 }
 
 Description::operator string() const { return generateSdp("\r\n"); }
@@ -210,47 +214,60 @@ string Description::generateSdp(const string &eol) const {
 	// see Negotiating Media Multiplexing Using the Session Description Protocol
 	// https://tools.ietf.org/html/draft-ietf-mmusic-sdp-bundle-negotiation-54
 	sdp << "a=group:BUNDLE";
-	for (const auto &[mid, _] : mMedia)
-		sdp << " " << mid;
-	sdp << " " << mData.mid << eol;
+	for (int i = 0; i < int(mMedia.size() + 1); ++i)
+		if (auto it = mMedia.find(i); it != mMedia.end())
+			sdp << ' ' << it->second.mid;
+		else
+			sdp << ' ' << mData.mid;
+	sdp << eol;
 
-	// Data
-	const string dataDescription = "UDP/DTLS/SCTP webrtc-datachannel";
-	sdp << "m=application" << ' ' << (!mMedia.empty() ? 0 : 9) << ' ' << dataDescription << eol;
-	sdp << "c=IN IP4 0.0.0.0" << eol;
-	if (!mMedia.empty())
-		sdp << "a=bundle-only" << eol;
-	sdp << "a=mid:" << mData.mid << eol;
-	if (mData.sctpPort)
-		sdp << "a=sctp-port:" << *mData.sctpPort << eol;
-	if (mData.maxMessageSize)
-		sdp << "a=max-message-size:" << *mData.maxMessageSize << eol;
+	sdp << "a=msid-semantic: WMS" << eol;
 
 	// Non-data media
 	if (!mMedia.empty()) {
 		// Lip-sync
 		sdp << "a=group:LS";
-		for (const auto &[mid, _] : mMedia)
-			sdp << " " << mid;
+		for (const auto &p : mMedia)
+			sdp << " " << p.second.mid;
 		sdp << eol;
+	}
 
-		// Descriptions and attributes
-		for (const auto &[_, media] : mMedia) {
+	// Descriptions and attributes
+	for (int i = 0; i < int(mMedia.size() + 1); ++i) {
+		if (auto it = mMedia.find(i); it != mMedia.end()) {
+			// Non-data media
+			const auto &media = it->second;
 			sdp << "m=" << media.type << ' ' << 0 << ' ' << media.description << eol;
 			sdp << "c=IN IP4 0.0.0.0" << eol;
 			sdp << "a=bundle-only" << eol;
 			sdp << "a=mid:" << media.mid << eol;
 			for (const auto &attr : media.attributes)
 				sdp << "a=" << attr << eol;
+
+		} else {
+			// Data
+			const string description = "UDP/DTLS/SCTP webrtc-datachannel";
+			sdp << "m=application" << ' ' << (!mMedia.empty() ? 0 : 9) << ' ' << description << eol;
+			sdp << "c=IN IP4 0.0.0.0" << eol;
+			if (!mMedia.empty())
+				sdp << "a=bundle-only" << eol;
+			sdp << "a=mid:" << mData.mid << eol;
+			if (mData.sctpPort)
+				sdp << "a=sctp-port:" << *mData.sctpPort << eol;
+			if (mData.maxMessageSize)
+				sdp << "a=max-message-size:" << *mData.maxMessageSize << eol;
 		}
 	}
 
 	// Common
-	sdp << "a=ice-options:trickle" << eol;
+	if (!mEnded)
+		sdp << "a=ice-options:trickle" << eol;
+
 	sdp << "a=ice-ufrag:" << mIceUfrag << eol;
 	sdp << "a=ice-pwd:" << mIcePwd << eol;
 	sdp << "a=setup:" << roleToString(mRole) << eol;
-	sdp << "a=dtls-id:1" << eol;
+	sdp << "a=tls-id:1" << eol;
+
 	if (mFingerprint)
 		sdp << "a=fingerprint:sha-256 " << *mFingerprint << eol;
 

src/dtlssrtptransport.cpp

@@ -43,50 +43,86 @@ DtlsSrtpTransport::DtlsSrtpTransport(std::shared_ptr<IceTransport> lower,
                     std::move(stateChangeCallback)),
       mSrtpRecvCallback(std::move(srtpRecvCallback)) { // distinct from Transport recv callback
 
-	PLOG_DEBUG << "Initializing SRTP transport";
+	PLOG_DEBUG << "Initializing DTLS-SRTP transport";
 
-#if USE_GNUTLS
-	PLOG_DEBUG << "Initializing DTLS-SRTP transport (GnuTLS)";
-	gnutls::check(gnutls_srtp_set_profile(mSession, GNUTLS_SRTP_AES128_CM_HMAC_SHA1_80),
-	              "Failed to set SRTP profile");
-#else
-	PLOG_DEBUG << "Initializing DTLS-SRTP transport (OpenSSL)";
-	openssl::check(SSL_set_tlsext_use_srtp(mSsl, "SRTP_AES128_CM_SHA1_80"),
-	               "Failed to set SRTP profile");
-#endif
+	if (srtp_err_status_t err = srtp_create(&mSrtpIn, nullptr)) {
+		throw std::runtime_error("SRTP create failed, status=" + to_string(static_cast<int>(err)));
+	}
+	if (srtp_err_status_t err = srtp_create(&mSrtpOut, nullptr)) {
+		srtp_dealloc(mSrtpIn);
+		throw std::runtime_error("SRTP create failed, status=" + to_string(static_cast<int>(err)));
+	}
 }
 
 DtlsSrtpTransport::~DtlsSrtpTransport() {
 	stop();
 
-	if (mCreated)
-		srtp_dealloc(mSrtp);
+	srtp_dealloc(mSrtpIn);
+	srtp_dealloc(mSrtpOut);
 }
 
-bool DtlsSrtpTransport::send(message_ptr message) {
+bool DtlsSrtpTransport::sendMedia(message_ptr message) {
 	if (!message)
 		return false;
 
+	if (!mInitDone) {
+		PLOG_WARNING << "SRTP media sent before keys are derived";
+		return false;
+	}
+
 	int size = message->size();
 	PLOG_VERBOSE << "Send size=" << size;
 
-	// srtp_protect() assumes that it can write SRTP_MAX_TRAILER_LEN (for the authentication tag)
-	// into the location in memory immediately following the RTP packet.
+	// The RTP header has a minimum size of 12 bytes
+	if (size < 12)
+		throw std::runtime_error("RTP/RTCP packet too short");
+
+	// srtp_protect() and srtp_protect_rtcp() assume that they can write SRTP_MAX_TRAILER_LEN (for
+	// the authentication tag) into the location in memory immediately following the RTP packet.
 	message->resize(size + SRTP_MAX_TRAILER_LEN);
-	if (srtp_err_status_t err = srtp_protect(mSrtp, message->data(), &size)) {
-		if (err == srtp_err_status_replay_fail)
-			throw std::runtime_error("SRTP packet is a replay");
-		else
-			throw std::runtime_error("SRTP protect error, status=" +
-			                         to_string(static_cast<int>(err)));
+
+	uint8_t value2 = to_integer<uint8_t>(*(message->begin() + 1)) & 0x7F;
+	PLOG_VERBOSE << "Demultiplexing SRTCP and SRTP with RTP payload type, value="
+	             << unsigned(value2);
+
+	// RFC 5761 Multiplexing RTP and RTCP 4. Distinguishable RTP and RTCP Packets
+	// It is RECOMMENDED to follow the guidelines in the RTP/AVP profile for the choice of RTP
+	// payload type values, with the additional restriction that payload type values in the
+	// range 64-95 MUST NOT be used. Specifically, dynamic RTP payload types SHOULD be chosen in
+	// the range 96-127 where possible. Values below 64 MAY be used if that is insufficient
+	// [...]
+	if (value2 >= 64 && value2 <= 95) { // Range 64-95 (inclusive) MUST be RTCP
+		if (srtp_err_status_t err = srtp_protect_rtcp(mSrtpOut, message->data(), &size)) {
+			if (err == srtp_err_status_replay_fail)
+				throw std::runtime_error("SRTCP packet is a replay");
+			else
+				throw std::runtime_error("SRTCP protect error, status=" +
+				                         to_string(static_cast<int>(err)));
+		}
+		PLOG_VERBOSE << "Protected SRTCP packet, size=" << size;
+	} else {
+		if (srtp_err_status_t err = srtp_protect(mSrtpOut, message->data(), &size)) {
+			if (err == srtp_err_status_replay_fail)
+				throw std::runtime_error("SRTP packet is a replay");
+			else
+				throw std::runtime_error("SRTP protect error, status=" +
+				                         to_string(static_cast<int>(err)));
+		}
+		PLOG_VERBOSE << "Protected SRTP packet, size=" << size;
 	}
-	PLOG_VERBOSE << "Protected SRTP packet, size=" << size;
+
 	message->resize(size);
 	outgoing(message);
 	return true;
 }
 
 void DtlsSrtpTransport::incoming(message_ptr message) {
+	if (!mInitDone) {
+		// Bypas
+		DtlsTransport::incoming(message);
+		return;
+	}
+
 	int size = message->size();
 	if (size == 0)
 		return;
@@ -95,49 +131,80 @@ void DtlsSrtpTransport::incoming(message_ptr message) {
 	// The process for demultiplexing a packet is as follows. The receiver looks at the first byte
 	// of the packet. [...] If the value is in between 128 and 191 (inclusive), then the packet is
 	// RTP (or RTCP [...]). If the value is between 20 and 63 (inclusive), the packet is DTLS.
-	uint8_t value = to_integer<uint8_t>(*message->begin());
+	uint8_t value1 = to_integer<uint8_t>(*message->begin());
+	PLOG_VERBOSE << "Demultiplexing DTLS and SRTP/SRTCP with first byte, value="
+	             << unsigned(value1);
 
-	if (value >= 128 && value <= 192) {
+	if (value1 >= 20 && value1 <= 63) {
 		PLOG_VERBOSE << "Incoming DTLS packet, size=" << size;
 		DtlsTransport::incoming(message);
-	} else if (value >= 20 && value <= 64) {
-		PLOG_VERBOSE << "Incoming SRTP packet, size=" << size;
 
-		if (srtp_err_status_t err = srtp_unprotect(mSrtp, message->data(), &size)) {
-			if (err == srtp_err_status_replay_fail)
-				PLOG_WARNING << "Incoming SRTP packet is a replay";
-			else
-				PLOG_WARNING << "SRTP unprotect error, status=" << err;
+	} else if (value1 >= 128 && value1 <= 191) {
+		// The RTP header has a minimum size of 12 bytes
+		if (size < 12) {
+			PLOG_WARNING << "Incoming SRTP/SRTCP packet too short, size=" << size;
 			return;
 		}
-		PLOG_VERBOSE << "Unprotected SRTP packet, size=" << size;
+
+		uint8_t value2 = to_integer<uint8_t>(*(message->begin() + 1)) & 0x7F;
+		PLOG_VERBOSE << "Demultiplexing SRTCP and SRTP with RTP payload type, value="
+		             << unsigned(value2);
+
+		// See RFC 5761 reference above
+		if (value2 >= 64 && value2 <= 95) { // Range 64-95 (inclusive) MUST be RTCP
+			PLOG_VERBOSE << "Incoming SRTCP packet, size=" << size;
+			if (srtp_err_status_t err = srtp_unprotect_rtcp(mSrtpIn, message->data(), &size)) {
+				if (err == srtp_err_status_replay_fail)
+					PLOG_WARNING << "Incoming SRTCP packet is a replay";
+				else
+					PLOG_WARNING << "SRTCP unprotect error, status=" << err;
+				return;
+			}
+			PLOG_VERBOSE << "Unprotected SRTCP packet, size=" << size;
+		} else {
+			PLOG_VERBOSE << "Incoming SRTP packet, size=" << size;
+			if (srtp_err_status_t err = srtp_unprotect(mSrtpIn, message->data(), &size)) {
+				if (err == srtp_err_status_replay_fail)
+					PLOG_WARNING << "Incoming SRTP packet is a replay";
+				else
+					PLOG_WARNING << "SRTP unprotect error, status=" << err;
+				return;
+			}
+			PLOG_VERBOSE << "Unprotected SRTP packet, size=" << size;
+		}
+
 		message->resize(size);
 		mSrtpRecvCallback(message);
 
 	} else {
-		PLOG_WARNING << "Unknown packet type, value=" << value << ", size=" << size;
+		PLOG_WARNING << "Unknown packet type, value=" << unsigned(value1) << ", size=" << size;
 	}
 }
 
+void DtlsSrtpTransport::postCreation() {
+#if USE_GNUTLS
+	PLOG_DEBUG << "Setting SRTP profile (GnuTLS)";
+	gnutls::check(gnutls_srtp_set_profile(mSession, GNUTLS_SRTP_AES128_CM_HMAC_SHA1_80),
+	              "Failed to set SRTP profile");
+#else
+	PLOG_DEBUG << "Setting SRTP profile (OpenSSL)";
+	// returns 0 on success, 1 on error
+	if (SSL_set_tlsext_use_srtp(mSsl, "SRTP_AES128_CM_SHA1_80"), "Failed to set SRTP profile")
+		throw std::runtime_error("Failed to set SRTP profile: " + openssl::error_string(ERR_get_error()));
+#endif
+}
+
 void DtlsSrtpTransport::postHandshake() {
-	if (mCreated)
+	if (mInitDone)
 		return;
 
-	srtp_policy_t inbound = {};
-	srtp_crypto_policy_set_aes_cm_128_hmac_sha1_80(&inbound.rtp);
-	srtp_crypto_policy_set_aes_cm_128_hmac_sha1_80(&inbound.rtcp);
-	inbound.ssrc.type = ssrc_any_inbound;
-
-	srtp_policy_t outbound = {};
-	srtp_crypto_policy_set_aes_cm_128_hmac_sha1_80(&outbound.rtp);
-	srtp_crypto_policy_set_aes_cm_128_hmac_sha1_80(&outbound.rtcp);
-	outbound.ssrc.type = ssrc_any_outbound;
-
 	const size_t materialLen = SRTP_AES_ICM_128_KEY_LEN_WSALT * 2;
 	unsigned char material[materialLen];
 	const unsigned char *clientKey, *clientSalt, *serverKey, *serverSalt;
 
 #if USE_GNUTLS
+	PLOG_INFO << "Deriving SRTP keying material (GnuTLS)";
+
 	gnutls_datum_t clientKeyDatum, clientSaltDatum, serverKeyDatum, serverSaltDatum;
 	gnutls::check(gnutls_srtp_get_keys(mSession, material, materialLen, &clientKeyDatum,
 	                                   &clientSaltDatum, &serverKeyDatum, &serverSaltDatum),
@@ -160,18 +227,23 @@ void DtlsSrtpTransport::postHandshake() {
 	serverKey = reinterpret_cast<const unsigned char *>(serverKeyDatum.data);
 	serverSalt = reinterpret_cast<const unsigned char *>(serverSaltDatum.data);
 #else
-	// This provides the client write master key, the server write master key, the client write
-	// master salt and the server write master salt in that order.
+	PLOG_INFO << "Deriving SRTP keying material (OpenSSL)";
+
+	// The extractor provides the client write master key, the server write master key, the client
+	// write master salt and the server write master salt in that order.
 	const string label = "EXTRACTOR-dtls_srtp";
-	openssl::check(SSL_export_keying_material(mSsl, material, materialLen, label.c_str(),
-	                                          label.size(), nullptr, 0, 0),
-	               "Failed to derive SRTP keys");
+
+	// returns 1 on success, 0 or -1 on failure (OpenSSL API is a complete mess...)
+	if (SSL_export_keying_material(mSsl, material, materialLen, label.c_str(), label.size(),
+	                               nullptr, 0, 0) <= 0)
+		throw std::runtime_error("Failed to derive SRTP keys: " +
+		                         openssl::error_string(ERR_get_error()));
 
 	clientKey = material;
 	clientSalt = clientKey + SRTP_AES_128_KEY_LEN;
 
 	serverKey = material + SRTP_AES_ICM_128_KEY_LEN_WSALT;
-	serverSalt = serverSalt + SRTP_AES_128_KEY_LEN;
+	serverSalt = serverKey + SRTP_AES_128_KEY_LEN;
 #endif
 
 	unsigned char clientSessionKey[SRTP_AES_ICM_128_KEY_LEN_WSALT];
@@ -182,22 +254,31 @@ void DtlsSrtpTransport::postHandshake() {
 	std::memcpy(serverSessionKey, serverKey, SRTP_AES_128_KEY_LEN);
 	std::memcpy(serverSessionKey + SRTP_AES_128_KEY_LEN, serverSalt, SRTP_SALT_LEN);
 
-	if (mIsClient) {
-		inbound.key = serverSessionKey;
-		outbound.key = clientSessionKey;
-	} else {
-		inbound.key = clientSessionKey;
-		outbound.key = serverSessionKey;
-	}
+	srtp_policy_t inbound = {};
+	srtp_crypto_policy_set_aes_cm_128_hmac_sha1_80(&inbound.rtp);
+	srtp_crypto_policy_set_aes_cm_128_hmac_sha1_80(&inbound.rtcp);
+	inbound.ssrc.type = ssrc_any_inbound;
+	inbound.ssrc.value = 0;
+	inbound.key = mIsClient ? serverSessionKey : clientSessionKey;
+	inbound.next = nullptr;
 
-	srtp_policy_t *policies = &inbound;
-	inbound.next = &outbound;
+	if (srtp_err_status_t err = srtp_add_stream(mSrtpIn, &inbound))
+		throw std::runtime_error("SRTP add inbound stream failed, status=" +
+		                         to_string(static_cast<int>(err)));
+
+	srtp_policy_t outbound = {};
+	srtp_crypto_policy_set_aes_cm_128_hmac_sha1_80(&outbound.rtp);
+	srtp_crypto_policy_set_aes_cm_128_hmac_sha1_80(&outbound.rtcp);
+	outbound.ssrc.type = ssrc_any_outbound;
+	outbound.ssrc.value = 0;
+	outbound.key = mIsClient ? clientSessionKey : serverSessionKey;
 	outbound.next = nullptr;
 
-	if (srtp_err_status_t err = srtp_create(&mSrtp, policies))
-		throw std::runtime_error("SRTP create failed, status=" + to_string(static_cast<int>(err)));
+	if (srtp_err_status_t err = srtp_add_stream(mSrtpOut, &outbound))
+		throw std::runtime_error("SRTP add outbound stream failed, status=" +
+		                         to_string(static_cast<int>(err)));
 
-	mCreated = true;
+	mInitDone = true;
 }
 
 } // namespace rtc

src/dtlssrtptransport.hpp

@@ -38,16 +38,17 @@ public:
 	                  state_callback stateChangeCallback);
 	~DtlsSrtpTransport();
 
-	bool send(message_ptr message) override;
+	bool sendMedia(message_ptr message);
 
 private:
 	void incoming(message_ptr message) override;
+	void postCreation() override;
 	void postHandshake() override;
 
 	message_callback mSrtpRecvCallback;
 
-	srtp_t mSrtp;
-	bool mCreated = false;
+	srtp_t mSrtpIn, mSrtpOut;
+	bool mInitDone = false;
 };
 
 } // namespace rtc

src/dtlstransport.cpp

@@ -24,6 +24,14 @@
 #include <exception>
 #include <iostream>
 
+#if !USE_GNUTLS
+#ifdef _WIN32
+#include <winsock2.h> // for timeval
+#else
+#include <sys/time.h> // for timeval
+#endif
+#endif
+
 using namespace std::chrono;
 
 using std::shared_ptr;
@@ -77,6 +85,8 @@ DtlsTransport::DtlsTransport(shared_ptr<IceTransport> lower, certificate_ptr cer
 		gnutls_transport_set_pull_function(mSession, ReadCallback);
 		gnutls_transport_set_pull_timeout_function(mSession, TimeoutCallback);
 
+		postCreation();
+
 		mRecvThread = std::thread(&DtlsTransport::runRecvLoop, this);
 		registerIncoming();
 
@@ -129,6 +139,10 @@ void DtlsTransport::incoming(message_ptr message) {
 	mIncomingQueue.push(message);
 }
 
+void DtlsTransport::postCreation() {
+	// Dummy
+}
+
 void DtlsTransport::postHandshake() {
 	// Dummy
 }
@@ -300,7 +314,8 @@ DtlsTransport::DtlsTransport(shared_ptr<IceTransport> lower, shared_ptr<Certific
 	PLOG_DEBUG << "Initializing DTLS transport (OpenSSL)";
 
 	try {
-		if (!(mCtx = SSL_CTX_new(DTLS_method())))
+		mCtx = SSL_CTX_new(DTLS_method());
+		if (!mCtx)
 			throw std::runtime_error("Failed to create SSL context");
 
 		openssl::check(SSL_CTX_set_cipher_list(mCtx, "ALL:!LOW:!EXP:!RC4:!MD5:@STRENGTH"),
@@ -324,7 +339,8 @@ DtlsTransport::DtlsTransport(shared_ptr<IceTransport> lower, shared_ptr<Certific
 
 		openssl::check(SSL_CTX_check_private_key(mCtx), "SSL local private key check failed");
 
-		if (!(mSsl = SSL_new(mCtx)))
+		mSsl = SSL_new(mCtx);
+		if (!mSsl)
 			throw std::runtime_error("Failed to create SSL instance");
 
 		SSL_set_ex_data(mSsl, TransportExIndex, this);
@@ -334,7 +350,9 @@ DtlsTransport::DtlsTransport(shared_ptr<IceTransport> lower, shared_ptr<Certific
 		else
 			SSL_set_accept_state(mSsl);
 
-		if (!(mInBio = BIO_new(BIO_s_mem())) || !(mOutBio = BIO_new(BioMethods)))
+		mInBio = BIO_new(BIO_s_mem());
+		mOutBio = BIO_new(BioMethods);
+		if (!mInBio || !mOutBio)
 			throw std::runtime_error("Failed to create BIO");
 
 		BIO_set_mem_eof_return(mInBio, BIO_EOF);
@@ -382,7 +400,7 @@ bool DtlsTransport::send(message_ptr message) {
 
 	PLOG_VERBOSE << "Send size=" << message->size();
 
-	int ret = SSL_write(mSsl, message->data(), message->size());
+	int ret = SSL_write(mSsl, message->data(), int(message->size()));
 	return openssl::check(mSsl, ret);
 }
 
@@ -396,6 +414,10 @@ void DtlsTransport::incoming(message_ptr message) {
 	mIncomingQueue.push(message);
 }
 
+void DtlsTransport::postCreation() {
+	// Dummy
+}
+
 void DtlsTransport::postHandshake() {
 	// Dummy
 }
@@ -416,11 +438,11 @@ void DtlsTransport::runRecvLoop() {
 			// Process pending messages
 			while (!mIncomingQueue.empty()) {
 				auto message = *mIncomingQueue.pop();
-				BIO_write(mInBio, message->data(), message->size());
+				BIO_write(mInBio, message->data(), int(message->size()));
 
 				if (state() == State::Connecting) {
 					// Continue the handshake
-					int ret = SSL_do_handshake(mSsl);
+					ret = SSL_do_handshake(mSsl);
 					if (!openssl::check(mSsl, ret, "Handshake failed"))
 						break;
 
@@ -434,7 +456,7 @@ void DtlsTransport::runRecvLoop() {
 						postHandshake();
 					}
 				} else {
-					int ret = SSL_read(mSsl, buffer, bufferSize);
+					ret = SSL_read(mSsl, buffer, bufferSize);
 					if (!openssl::check(mSsl, ret))
 						break;
 
@@ -447,7 +469,7 @@ void DtlsTransport::runRecvLoop() {
 			std::optional<milliseconds> duration;
 			if (state() == State::Connecting) {
 				// Warning: This function breaks the usual return value convention
-				int ret = DTLSv1_handle_timeout(mSsl);
+				ret = DTLSv1_handle_timeout(mSsl);
 				if (ret < 0) {
 					throw std::runtime_error("Handshake timeout"); // write BIO can't fail
 				} else if (ret > 0) {
@@ -486,7 +508,7 @@ void DtlsTransport::runRecvLoop() {
 	}
 }
 
-int DtlsTransport::CertificateCallback(int preverify_ok, X509_STORE_CTX *ctx) {
+int DtlsTransport::CertificateCallback(int /*preverify_ok*/, X509_STORE_CTX *ctx) {
 	SSL *ssl =
 	    static_cast<SSL *>(X509_STORE_CTX_get_ex_data(ctx, SSL_get_ex_data_X509_STORE_CTX_idx()));
 	DtlsTransport *t =
@@ -535,7 +557,7 @@ int DtlsTransport::BioMethodWrite(BIO *bio, const char *in, int inl) {
 	return inl; // can't fail
 }
 
-long DtlsTransport::BioMethodCtrl(BIO *bio, int cmd, long num, void *ptr) {
+long DtlsTransport::BioMethodCtrl(BIO * /*bio*/, int cmd, long /*num*/, void * /*ptr*/) {
 	switch (cmd) {
 	case BIO_CTRL_FLUSH:
 		return 1;

src/dtlstransport.hpp

@@ -52,6 +52,7 @@ public:
 
 protected:
 	virtual void incoming(message_ptr message) override;
+	virtual void postCreation();
 	virtual void postHandshake();
 	void runRecvLoop();
 

src/icetransport.cpp

@@ -40,8 +40,9 @@ using namespace std::chrono_literals;
 
 using std::shared_ptr;
 using std::weak_ptr;
+using std::chrono::system_clock;
 
-#if USE_JUICE
+#if !USE_NICE
 
 namespace rtc {
 
@@ -69,7 +70,7 @@ IceTransport::IceTransport(const Configuration &config, Description::Role role,
 
 	// Randomize servers order
 	std::vector<IceServer> servers = config.iceServers;
-	unsigned seed = std::chrono::system_clock::now().time_since_epoch().count();
+	auto seed = static_cast<unsigned int>(system_clock::now().time_since_epoch().count());
 	std::shuffle(servers.begin(), servers.end(), std::default_random_engine(seed));
 
 	// Pick a STUN server (TURN support is not implemented in libjuice yet)
@@ -82,7 +83,7 @@ IceTransport::IceTransport(const Configuration &config, Description::Role role,
 			mStunHostname = server.hostname;
 			mStunService = server.service;
 			jconfig.stun_server_host = mStunHostname.c_str();
-			jconfig.stun_server_port = std::stoul(mStunService);
+			jconfig.stun_server_port = uint16_t(std::stoul(mStunService));
 			break;
 		}
 	}
@@ -206,7 +207,7 @@ void IceTransport::processCandidate(const string &candidate) {
 
 void IceTransport::processGatheringDone() { changeGatheringState(GatheringState::Complete); }
 
-void IceTransport::StateChangeCallback(juice_agent_t *agent, juice_state_t state, void *user_ptr) {
+void IceTransport::StateChangeCallback(juice_agent_t *, juice_state_t state, void *user_ptr) {
 	auto iceTransport = static_cast<rtc::IceTransport *>(user_ptr);
 	try {
 		iceTransport->processStateChange(static_cast<unsigned int>(state));
@@ -215,7 +216,7 @@ void IceTransport::StateChangeCallback(juice_agent_t *agent, juice_state_t state
 	}
 }
 
-void IceTransport::CandidateCallback(juice_agent_t *agent, const char *sdp, void *user_ptr) {
+void IceTransport::CandidateCallback(juice_agent_t *, const char *sdp, void *user_ptr) {
 	auto iceTransport = static_cast<rtc::IceTransport *>(user_ptr);
 	try {
 		iceTransport->processCandidate(sdp);
@@ -224,7 +225,7 @@ void IceTransport::CandidateCallback(juice_agent_t *agent, const char *sdp, void
 	}
 }
 
-void IceTransport::GatheringDoneCallback(juice_agent_t *agent, void *user_ptr) {
+void IceTransport::GatheringDoneCallback(juice_agent_t *, void *user_ptr) {
 	auto iceTransport = static_cast<rtc::IceTransport *>(user_ptr);
 	try {
 		iceTransport->processGatheringDone();
@@ -233,8 +234,7 @@ void IceTransport::GatheringDoneCallback(juice_agent_t *agent, void *user_ptr) {
 	}
 }
 
-void IceTransport::RecvCallback(juice_agent_t *agent, const char *data, size_t size,
-                                void *user_ptr) {
+void IceTransport::RecvCallback(juice_agent_t *, const char *data, size_t size, void *user_ptr) {
 	auto iceTransport = static_cast<rtc::IceTransport *>(user_ptr);
 	try {
 		PLOG_VERBOSE << "Incoming size=" << size;
@@ -269,7 +269,7 @@ void IceTransport::LogCallback(juice_log_level_t level, const char *message) {
 
 } // namespace rtc
 
-#else // USE_JUICE == 0
+#else // USE_NICE == 1
 
 namespace rtc {
 
@@ -337,7 +337,7 @@ IceTransport::IceTransport(const Configuration &config, Description::Role role,
 
 	// Randomize order
 	std::vector<IceServer> servers = config.iceServers;
-	unsigned seed = std::chrono::system_clock::now().time_since_epoch().count();
+	auto seed = static_cast<unsigned int>(system_clock::now().time_since_epoch().count());
 	std::shuffle(servers.begin(), servers.end(), std::default_random_engine(seed));
 
 	// Add one STUN server

src/icetransport.hpp

@@ -26,7 +26,7 @@
 #include "peerconnection.hpp"
 #include "transport.hpp"
 
-#if USE_JUICE
+#if !USE_NICE
 #include <juice/juice.h>
 #else
 #include <nice/agent.h>
@@ -63,7 +63,7 @@ public:
 	bool stop() override;
 	bool send(message_ptr message) override; // false if dropped
 
-#if !USE_JUICE
+#if USE_NICE
 	bool getSelectedCandidatePair(CandidateInfo *local, CandidateInfo *remote);
 #endif
 
@@ -85,7 +85,7 @@ private:
 	candidate_callback mCandidateCallback;
 	gathering_state_callback mGatheringStateChangeCallback;
 
-#if USE_JUICE
+#if !USE_NICE
 	std::unique_ptr<juice_agent_t, void (*)(juice_agent_t *)> mAgent;
 	string mStunHostname;
 	string mStunService;

src/init.cpp

@@ -21,6 +21,7 @@
 #include "certificate.hpp"
 #include "dtlstransport.hpp"
 #include "sctptransport.hpp"
+#include "threadpool.hpp"
 #include "tls.hpp"
 
 #if RTC_ENABLE_WEBSOCKET
@@ -39,38 +40,21 @@ using std::shared_ptr;
 
 namespace rtc {
 
-std::weak_ptr<Init> Init::Weak;
-init_token Init::Global;
-std::mutex Init::Mutex;
+namespace {
 
-init_token Init::Token() {
-	std::lock_guard lock(Mutex);
+void doInit() {
+	PLOG_DEBUG << "Global initialization";
 
-	if (!Global) {
-		if (auto token = Weak.lock())
-			Global = token;
-		else
-			Global = shared_ptr<Init>(new Init());
-	}
-	return Global;
-}
-
-void Init::Preload() {
-	Token();                   // pre-init
-	make_certificate().wait(); // preload certificate
-}
-
-void Init::Cleanup() { Global.reset(); }
-
-Init::Init() {
 #ifdef _WIN32
 	WSADATA wsaData;
 	if (WSAStartup(MAKEWORD(2, 2), &wsaData))
 		throw std::runtime_error("WSAStartup failed, error=" + std::to_string(WSAGetLastError()));
 #endif
 
+	ThreadPool::Instance().spawn(THREADPOOL_SIZE);
+
 #if USE_GNUTLS
-		// Nothing to do
+	// Nothing to do
 #else
 	openssl::init();
 #endif
@@ -85,8 +69,12 @@ Init::Init() {
 #endif
 }
 
-Init::~Init() {
+void doCleanup() {
+	PLOG_DEBUG << "Global cleanup";
+
+	ThreadPool::Instance().join();
 	CleanupCertificateCache();
+
 	SctpTransport::Cleanup();
 	DtlsTransport::Cleanup();
 #if RTC_ENABLE_WEBSOCKET
@@ -101,5 +89,57 @@ Init::~Init() {
 #endif
 }
 
+} // namespace
+
+std::weak_ptr<void> Init::Weak;
+std::shared_ptr<void> *Init::Global = nullptr;
+bool Init::Initialized = false;
+std::recursive_mutex Init::Mutex;
+
+init_token Init::Token() {
+	std::unique_lock lock(Mutex);
+	if (auto token = Weak.lock())
+		return token;
+
+	delete Global;
+	Global = new shared_ptr<void>(new Init());
+	Weak = *Global;
+	return *Global;
+}
+
+void Init::Preload() {
+	std::unique_lock lock(Mutex);
+	auto token = Token();
+	if (!Global)
+		Global = new shared_ptr<void>(token);
+
+	PLOG_DEBUG << "Preloading certificate";
+	make_certificate().wait();
+}
+
+void Init::Cleanup() {
+	std::unique_lock lock(Mutex);
+	delete Global;
+	Global = nullptr;
+}
+
+Init::Init() {
+	// Mutex is locked by Token() here
+	if (!std::exchange(Initialized, true))
+		doInit();
+}
+
+Init::~Init() {
+	std::thread t([]() {
+		// We need to lock Mutex ourselves
+		std::unique_lock lock(Mutex);
+		if (Global)
+			return;
+		if (std::exchange(Initialized, false))
+			doCleanup();
+	});
+	t.detach();
+}
+
 } // namespace rtc
 

src/log.cpp

@@ -19,6 +19,8 @@
 #include "log.hpp"
 
 #include "plog/Appenders/ColorConsoleAppender.h"
+#include "plog/Formatters/TxtFormatter.h"
+#include "plog/Init.h"
 #include "plog/Log.h"
 #include "plog/Logger.h"
 

src/peerconnection.cpp

@@ -18,9 +18,12 @@
 
 #include "peerconnection.hpp"
 #include "certificate.hpp"
+#include "include.hpp"
+#include "processor.hpp"
+#include "threadpool.hpp"
+
 #include "dtlstransport.hpp"
 #include "icetransport.hpp"
-#include "include.hpp"
 #include "sctptransport.hpp"
 
 #if RTC_ENABLE_MEDIA
@@ -39,8 +42,8 @@ using std::weak_ptr;
 PeerConnection::PeerConnection() : PeerConnection(Configuration()) {}
 
 PeerConnection::PeerConnection(const Configuration &config)
-    : mConfig(config), mCertificate(make_certificate()), mState(State::New),
-      mGatheringState(GatheringState::New) {
+    : mConfig(config), mCertificate(make_certificate()), mProcessor(std::make_unique<Processor>()),
+      mState(State::New), mGatheringState(GatheringState::New) {
 	PLOG_VERBOSE << "Creating PeerConnection";
 
 	if (config.portRangeEnd && config.portRangeBegin > config.portRangeEnd)
@@ -48,13 +51,17 @@ PeerConnection::PeerConnection(const Configuration &config)
 }
 
 PeerConnection::~PeerConnection() {
-	close();
 	PLOG_VERBOSE << "Destroying PeerConnection";
+	close();
+	mProcessor->join();
 }
 
 void PeerConnection::close() {
 	PLOG_VERBOSE << "Closing PeerConnection";
-	closeDataChannels();
+
+	// Close data channels asynchronously
+	mProcessor->enqueue(std::bind(&PeerConnection::closeDataChannels, this));
+
 	closeTransports();
 }
 
@@ -75,6 +82,11 @@ std::optional<Description> PeerConnection::remoteDescription() const {
 }
 
 void PeerConnection::setLocalDescription(std::optional<Description> description) {
+	if (description)
+		PLOG_VERBOSE << "Setting local description: " << string(*description);
+	else
+		PLOG_VERBOSE << "Setting default local description";
+
 	if (auto iceTransport = std::atomic_load(&mIceTransport)) {
 		throw std::logic_error("Local description is already set");
 	} else {
@@ -91,6 +103,8 @@ void PeerConnection::setLocalDescription(std::optional<Description> description)
 }
 
 void PeerConnection::setRemoteDescription(Description description) {
+	PLOG_VERBOSE << "Setting remote description: " << string(description);
+
 	description.hintType(localDescription() ? Description::Type::Answer : Description::Type::Offer);
 	auto type = description.type();
 	auto remoteCandidates = description.extractCandidates(); // Candidates will be added at the end
@@ -136,6 +150,7 @@ void PeerConnection::setRemoteDescription(Description description) {
 }
 
 void PeerConnection::addRemoteCandidate(Candidate candidate) {
+	PLOG_VERBOSE << "Adding remote candidate: " << string(candidate);
 
 	auto iceTransport = std::atomic_load(&mIceTransport);
 	if (!mRemoteDescription || !iceTransport)
@@ -145,6 +160,7 @@ void PeerConnection::addRemoteCandidate(Candidate candidate) {
 		iceTransport->addRemoteCandidate(candidate);
 	} else {
 		// OK, we might need a lookup, do it asynchronously
+		// We don't use the thread pool because we have no control on the timeout
 		weak_ptr<IceTransport> weakIceTransport{iceTransport};
 		std::thread t([weakIceTransport, candidate]() mutable {
 			if (candidate.resolve(Candidate::ResolveMode::Lookup))
@@ -227,7 +243,7 @@ void PeerConnection::sendMedia(const binary &packet) {
 	outgoingMedia(make_message(packet.begin(), packet.end(), Message::Binary));
 }
 
-void PeerConnection::send(const byte *packet, size_t size) {
+void PeerConnection::sendMedia(const byte *packet, size_t size) {
 	outgoingMedia(make_message(packet, packet + size, Message::Binary));
 }
 
@@ -244,7 +260,7 @@ void PeerConnection::outgoingMedia(message_ptr message) {
 	if (!transport)
 		throw std::runtime_error("PeerConnection is not open");
 
-	std::dynamic_pointer_cast<DtlsSrtpTransport>(transport)->send(message);
+	std::dynamic_pointer_cast<DtlsSrtpTransport>(transport)->sendMedia(message);
 #else
 	PLOG_WARNING << "Ignoring sent media (not compiled with SRTP support)";
 #endif
@@ -435,18 +451,19 @@ shared_ptr<SctpTransport> PeerConnection::initSctpTransport() {
 void PeerConnection::closeTransports() {
 	PLOG_VERBOSE << "Closing transports";
 
-	// Change state to sink state Closed to block init methods
+	// Change state to sink state Closed
 	changeState(State::Closed);
 
 	// Reset callbacks now that state is changed
 	resetCallbacks();
 
-	// Pass the references to a thread, allowing to terminate a transport from its own thread
-	auto sctp = std::atomic_exchange(&mSctpTransport, decltype(mSctpTransport)(nullptr));
-	auto dtls = std::atomic_exchange(&mDtlsTransport, decltype(mDtlsTransport)(nullptr));
-	auto ice = std::atomic_exchange(&mIceTransport, decltype(mIceTransport)(nullptr));
-	if (sctp || dtls || ice) {
-		std::thread t([sctp, dtls, ice, token = mInitToken]() mutable {
+	// Initiate transport stop on the processor after closing the data channels
+	mProcessor->enqueue([this]() {
+		// Pass the pointers to a thread
+		auto sctp = std::atomic_exchange(&mSctpTransport, decltype(mSctpTransport)(nullptr));
+		auto dtls = std::atomic_exchange(&mDtlsTransport, decltype(mDtlsTransport)(nullptr));
+		auto ice = std::atomic_exchange(&mIceTransport, decltype(mIceTransport)(nullptr));
+		ThreadPool::Instance().enqueue([sctp, dtls, ice]() mutable {
 			if (sctp)
 				sctp->stop();
 			if (dtls)
@@ -458,8 +475,7 @@ void PeerConnection::closeTransports() {
 			dtls.reset();
 			ice.reset();
 		});
-		t.detach();
-	}
+	});
 }
 
 void PeerConnection::endLocalCandidates() {
@@ -483,7 +499,7 @@ void PeerConnection::forwardMessage(message_ptr message) {
 		return;
 	}
 
-	auto channel = findDataChannel(message->stream);
+	auto channel = findDataChannel(uint16_t(message->stream));
 
 	auto iceTransport = std::atomic_load(&mIceTransport);
 	auto sctpTransport = std::atomic_load(&mSctpTransport);
@@ -502,7 +518,7 @@ void PeerConnection::forwardMessage(message_ptr message) {
 			mDataChannels.insert(std::make_pair(message->stream, channel));
 		} else {
 			// Invalid, close the DataChannel
-			sctpTransport->close(message->stream);
+			sctpTransport->closeStream(message->stream);
 			return;
 		}
 	}
@@ -594,20 +610,26 @@ void PeerConnection::remoteCloseDataChannels() {
 
 void PeerConnection::processLocalDescription(Description description) {
 	std::optional<uint16_t> remoteSctpPort;
-	if (auto remote = remoteDescription())
-		remoteSctpPort = remote->sctpPort();
+	std::optional<string> remoteDataMid;
+	if (auto remote = remoteDescription()) {
+		remoteDataMid = remote->dataMid();
+	    remoteSctpPort = remote->sctpPort();
+	}
 
 	auto certificate = mCertificate.get(); // wait for certificate if not ready
 
 	{
 		std::lock_guard lock(mLocalDescriptionMutex);
 		mLocalDescription.emplace(std::move(description));
+		if (remoteDataMid)
+			mLocalDescription->setDataMid(*remoteDataMid);
+
 		mLocalDescription->setFingerprint(certificate->fingerprint());
 		mLocalDescription->setSctpPort(remoteSctpPort.value_or(DEFAULT_SCTP_PORT));
 		mLocalDescription->setMaxMessageSize(LOCAL_MAX_MESSAGE_SIZE);
 	}
 
-	mLocalDescriptionCallback(*mLocalDescription);
+	mProcessor->enqueue([this]() { mLocalDescriptionCallback(*mLocalDescription); });
 }
 
 void PeerConnection::processLocalCandidate(Candidate candidate) {
@@ -617,7 +639,8 @@ void PeerConnection::processLocalCandidate(Candidate candidate) {
 
 	mLocalDescription->addCandidate(candidate);
 
-	mLocalCandidateCallback(candidate);
+	mProcessor->enqueue(
+	    [this, candidate = std::move(candidate)]() { mLocalCandidateCallback(candidate); });
 }
 
 void PeerConnection::triggerDataChannel(weak_ptr<DataChannel> weakDataChannel) {
@@ -625,7 +648,8 @@ void PeerConnection::triggerDataChannel(weak_ptr<DataChannel> weakDataChannel) {
 	if (!dataChannel)
 		return;
 
-	mDataChannelCallback(dataChannel);
+	mProcessor->enqueue(
+	    [this, dataChannel = std::move(dataChannel)]() { mDataChannelCallback(dataChannel); });
 }
 
 bool PeerConnection::changeState(State state) {
@@ -639,13 +663,18 @@ bool PeerConnection::changeState(State state) {
 
 	} while (!mState.compare_exchange_weak(current, state));
 
-	mStateChangeCallback(state);
+	if (state == State::Closed)
+		// This is the last state change, so we may steal the callback
+		mProcessor->enqueue([this, cb = std::move(mStateChangeCallback)]() { cb(State::Closed); });
+	else
+		mProcessor->enqueue([this, state]() { mStateChangeCallback(state); });
+
 	return true;
 }
 
 bool PeerConnection::changeGatheringState(GatheringState state) {
 	if (mGatheringState.exchange(state) != state)
-		mGatheringStateChangeCallback(state);
+		mProcessor->enqueue([this, state] { mGatheringStateChangeCallback(state); });
 	return true;
 }
 
@@ -658,12 +687,13 @@ void PeerConnection::resetCallbacks() {
 	mGatheringStateChangeCallback = nullptr;
 }
 
-bool PeerConnection::getSelectedCandidatePair(CandidateInfo *local, CandidateInfo *remote) {
-#if not USE_JUICE
+bool PeerConnection::getSelectedCandidatePair([[maybe_unused]] CandidateInfo *local,
+                                              [[maybe_unused]] CandidateInfo *remote) {
+#if USE_NICE
 	auto iceTransport = std::atomic_load(&mIceTransport);
 	return iceTransport->getSelectedCandidatePair(local, remote);
 #else
-	PLOG_WARNING << "getSelectedCandidatePair is not implemented for libjuice";
+	PLOG_WARNING << "getSelectedCandidatePair() is only implemented with libnice as ICE backend";
 	return false;
 #endif
 }

src/processor.cpp

@@ -0,0 +1,44 @@
+/**
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "processor.hpp"
+
+namespace rtc {
+
+Processor::~Processor() { join(); }
+
+void Processor::join() {
+	std::unique_lock lock(mMutex);
+	mCondition.wait(lock, [this]() { return !mPending && mTasks.empty(); });
+}
+
+void Processor::schedule() {
+	std::unique_lock lock(mMutex);
+	if (mTasks.empty()) {
+		// No more tasks
+		mPending = false;
+		mCondition.notify_all();
+		return;
+	}
+
+	ThreadPool::Instance().enqueue(std::move(mTasks.front()));
+	mTasks.pop();
+}
+
+} // namespace rtc
+

src/processor.hpp

@@ -0,0 +1,92 @@
+/**
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef RTC_PROCESSOR_H
+#define RTC_PROCESSOR_H
+
+#include "include.hpp"
+#include "init.hpp"
+#include "threadpool.hpp"
+
+#include <condition_variable>
+#include <future>
+#include <memory>
+#include <mutex>
+#include <queue>
+
+namespace rtc {
+
+// Processed tasks in order by delegating them to the thread pool
+class Processor final {
+public:
+	Processor() = default;
+	~Processor();
+
+	Processor(const Processor &) = delete;
+	Processor &operator=(const Processor &) = delete;
+	Processor(Processor &&) = delete;
+	Processor &operator=(Processor &&) = delete;
+
+	void join();
+
+	template <class F, class... Args>
+	auto enqueue(F &&f, Args &&... args) -> invoke_future_t<F, Args...>;
+
+protected:
+	void schedule();
+
+	// Keep an init token
+	const init_token mInitToken = Init::Token();
+
+	std::queue<std::function<void()>> mTasks;
+	bool mPending = false; // true iff a task is pending in the thread pool
+
+	mutable std::mutex mMutex;
+	std::condition_variable mCondition;
+};
+
+template <class F, class... Args>
+auto Processor::enqueue(F &&f, Args &&... args) -> invoke_future_t<F, Args...> {
+	std::unique_lock lock(mMutex);
+	using R = std::invoke_result_t<std::decay_t<F>, std::decay_t<Args>...>;
+	auto task = std::make_shared<std::packaged_task<R()>>(
+	    std::bind(std::forward<F>(f), std::forward<Args>(args)...));
+	std::future<R> result = task->get_future();
+
+	auto bundle = [this, task = std::move(task)]() {
+		try {
+			(*task)();
+		} catch (const std::exception &e) {
+			PLOG_WARNING << "Unhandled exception in task: " << e.what();
+		}
+		schedule(); // chain the next task
+	};
+
+	if (!mPending) {
+		ThreadPool::Instance().enqueue(std::move(bundle));
+		mPending = true;
+	} else {
+		mTasks.emplace(std::move(bundle));
+	}
+
+	return result;
+}
+
+} // namespace rtc
+
+#endif

src/rtc.cpp

@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2019 Paul-Louis Ageneau
+ * Copyright (c) 2019-2020 Paul-Louis Ageneau
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -18,14 +18,16 @@
 
 #include "include.hpp"
 
-#include "datachannel.hpp"
-#include "peerconnection.hpp"
+#include "rtc.h"
 
+#include "datachannel.hpp"
+#include "log.hpp"
+#include "peerconnection.hpp"
 #if RTC_ENABLE_WEBSOCKET
 #include "websocket.hpp"
 #endif
 
-#include <rtc.h>
+#include "plog/Formatters/FuncMessageFormatter.h"
 
 #include <exception>
 #include <mutex>
@@ -33,6 +35,11 @@
 #include <unordered_map>
 #include <utility>
 
+#ifdef _WIN32
+#include <codecvt>
+#include <locale>
+#endif
+
 using namespace rtc;
 using std::shared_ptr;
 using std::string;
@@ -48,18 +55,15 @@ std::unordered_map<int, void *> userPointerMap;
 std::mutex mutex;
 int lastId = 0;
 
-void *getUserPointer(int id) {
+std::optional<void *> getUserPointer(int id) {
 	std::lock_guard lock(mutex);
 	auto it = userPointerMap.find(id);
-	return it != userPointerMap.end() ? it->second : nullptr;
+	return it != userPointerMap.end() ? std::make_optional(it->second) : nullopt;
 }
 
 void setUserPointer(int i, void *ptr) {
 	std::lock_guard lock(mutex);
-	if (ptr)
-		userPointerMap.insert(std::make_pair(i, ptr));
-	else
-		userPointerMap.erase(i);
+	userPointerMap[i] = ptr;
 }
 
 shared_ptr<PeerConnection> getPeerConnection(int id) {
@@ -82,6 +86,7 @@ int emplacePeerConnection(shared_ptr<PeerConnection> ptr) {
 	std::lock_guard lock(mutex);
 	int pc = ++lastId;
 	peerConnectionMap.emplace(std::make_pair(pc, ptr));
+	userPointerMap.emplace(std::make_pair(pc, nullptr));
 	return pc;
 }
 
@@ -89,6 +94,7 @@ int emplaceDataChannel(shared_ptr<DataChannel> ptr) {
 	std::lock_guard lock(mutex);
 	int dc = ++lastId;
 	dataChannelMap.emplace(std::make_pair(dc, ptr));
+	userPointerMap.emplace(std::make_pair(dc, nullptr));
 	return dc;
 }
 
@@ -119,6 +125,7 @@ int emplaceWebSocket(shared_ptr<WebSocket> ptr) {
 	std::lock_guard lock(mutex);
 	int ws = ++lastId;
 	webSocketMap.emplace(std::make_pair(ws, ptr));
+	userPointerMap.emplace(std::make_pair(ws, nullptr));
 	return ws;
 }
 
@@ -143,7 +150,7 @@ shared_ptr<Channel> getChannel(int id) {
 
 template <typename F> int wrap(F func) {
 	try {
-		return func();
+		return int(func());
 
 	} catch (const std::invalid_argument &e) {
 		PLOG_ERROR << e.what();
@@ -160,9 +167,48 @@ template <typename F> int wrap(F func) {
 		return RTC_ERR_SUCCESS;                                                                    \
 	})
 
+class plog_appender : public plog::IAppender {
+public:
+	plog_appender(rtcLogCallbackFunc cb = nullptr) { set_callback(cb); }
+
+	void set_callback(rtcLogCallbackFunc cb) {
+		std::lock_guard lock(mutex);
+		callback = cb;
+	}
+
+	void write(const plog::Record &record) override {
+		plog::Severity severity = record.getSeverity();
+		auto formatted = plog::FuncMessageFormatter::format(record);
+		formatted.pop_back(); // remove newline
+#ifdef _WIN32
+		using convert_type = std::codecvt_utf8<wchar_t>;
+		std::wstring_convert<convert_type, wchar_t> converter;
+		std::string str = converter.to_bytes(formatted);
+#else
+		std::string str = formatted;
+#endif
+		std::lock_guard lock(mutex);
+		if (callback)
+			callback(static_cast<rtcLogLevel>(record.getSeverity()), str.c_str());
+		else
+			std::cout << plog::severityToString(severity) << " " << str << std::endl;
+	}
+
+private:
+	rtcLogCallbackFunc callback;
+};
+
 } // namespace
 
-void rtcInitLogger(rtcLogLevel level) { InitLogger(static_cast<LogLevel>(level)); }
+void rtcInitLogger(rtcLogLevel level, rtcLogCallbackFunc cb) {
+	static std::optional<plog_appender> appender;
+	if (appender)
+		appender->set_callback(cb);
+	else if (cb)
+		appender.emplace(plog_appender(cb));
+
+	InitLogger(static_cast<plog::Severity>(level), appender ? &appender.value() : nullptr);
+}
 
 void rtcSetUserPointer(int i, void *ptr) { setUserPointer(i, ptr); }
 
@@ -198,7 +244,8 @@ int rtcCreateDataChannel(int pc, const char *label) {
 	return WRAP({
 		auto peerConnection = getPeerConnection(pc);
 		int dc = emplaceDataChannel(peerConnection->createDataChannel(string(label)));
-		rtcSetUserPointer(dc, getUserPointer(pc));
+		if (auto ptr = getUserPointer(pc))
+			rtcSetUserPointer(dc, *ptr);
 		return dc;
 	});
 }
@@ -226,6 +273,16 @@ int rtcCreateWebSocket(const char *url) {
 	});
 }
 
+int rtcCreateWebSocketEx(const char *url, const rtcWsConfiguration *config) {
+	return WRAP({
+		WebSocket::Configuration c;
+		c.disableTlsVerification = config->disableTlsVerification;
+		auto ws = std::make_shared<WebSocket>(c);
+		ws->open(url);
+		return emplaceWebSocket(ws);
+	});
+}
+
 int rtcDeleteWebsocket(int ws) {
 	return WRAP({
 		auto webSocket = getWebSocket(ws);
@@ -241,63 +298,68 @@ int rtcDeleteWebsocket(int ws) {
 }
 #endif
 
-int rtcSetDataChannelCallback(int pc, dataChannelCallbackFunc cb) {
+int rtcSetDataChannelCallback(int pc, rtcDataChannelCallbackFunc cb) {
 	return WRAP({
 		auto peerConnection = getPeerConnection(pc);
 		if (cb)
 			peerConnection->onDataChannel([pc, cb](std::shared_ptr<DataChannel> dataChannel) {
 				int dc = emplaceDataChannel(dataChannel);
-				void *ptr = getUserPointer(pc);
-				rtcSetUserPointer(dc, ptr);
-				cb(dc, ptr);
+				if (auto ptr = getUserPointer(pc)) {
+					rtcSetUserPointer(dc, *ptr);
+					cb(dc, *ptr);
+				}
 			});
 		else
 			peerConnection->onDataChannel(nullptr);
 	});
 }
 
-int rtcSetLocalDescriptionCallback(int pc, descriptionCallbackFunc cb) {
+int rtcSetLocalDescriptionCallback(int pc, rtcDescriptionCallbackFunc cb) {
 	return WRAP({
 		auto peerConnection = getPeerConnection(pc);
 		if (cb)
 			peerConnection->onLocalDescription([pc, cb](const Description &desc) {
-				cb(string(desc).c_str(), desc.typeString().c_str(), getUserPointer(pc));
+				if (auto ptr = getUserPointer(pc))
+					cb(string(desc).c_str(), desc.typeString().c_str(), *ptr);
 			});
 		else
 			peerConnection->onLocalDescription(nullptr);
 	});
 }
 
-int rtcSetLocalCandidateCallback(int pc, candidateCallbackFunc cb) {
+int rtcSetLocalCandidateCallback(int pc, rtcCandidateCallbackFunc cb) {
 	return WRAP({
 		auto peerConnection = getPeerConnection(pc);
 		if (cb)
 			peerConnection->onLocalCandidate([pc, cb](const Candidate &cand) {
-				cb(cand.candidate().c_str(), cand.mid().c_str(), getUserPointer(pc));
+				if (auto ptr = getUserPointer(pc))
+					cb(cand.candidate().c_str(), cand.mid().c_str(), *ptr);
 			});
 		else
 			peerConnection->onLocalCandidate(nullptr);
 	});
 }
 
-int rtcSetStateChangeCallback(int pc, stateChangeCallbackFunc cb) {
+int rtcSetStateChangeCallback(int pc, rtcStateChangeCallbackFunc cb) {
 	return WRAP({
 		auto peerConnection = getPeerConnection(pc);
 		if (cb)
 			peerConnection->onStateChange([pc, cb](PeerConnection::State state) {
-				cb(static_cast<rtcState>(state), getUserPointer(pc));
+				if (auto ptr = getUserPointer(pc))
+					cb(static_cast<rtcState>(state), *ptr);
 			});
 		else
 			peerConnection->onStateChange(nullptr);
 	});
 }
 
-int rtcSetGatheringStateChangeCallback(int pc, gatheringStateCallbackFunc cb) {
+int rtcSetGatheringStateChangeCallback(int pc, rtcGatheringStateCallbackFunc cb) {
 	return WRAP({
 		auto peerConnection = getPeerConnection(pc);
 		if (cb)
 			peerConnection->onGatheringStateChange([pc, cb](PeerConnection::GatheringState state) {
-				cb(static_cast<rtcGatheringState>(state), getUserPointer(pc));
+				if (auto ptr = getUserPointer(pc))
+					cb(static_cast<rtcGatheringState>(state), *ptr);
 			});
 		else
 			peerConnection->onGatheringStateChange(nullptr);
@@ -333,9 +395,13 @@ int rtcGetLocalAddress(int pc, char *buffer, int size) {
 		if (!buffer)
 			throw std::invalid_argument("Unexpected null pointer");
 
+		if (size <= 0)
+			return 0;
+
 		if (auto addr = peerConnection->localAddress()) {
-			size = std::min(size_t(size - 1), addr->size());
-			std::copy(addr->data(), addr->data() + size, buffer);
+			const char *data = addr->data();
+			size = std::min(size - 1, int(addr->size()));
+			std::copy(data, data + size, buffer);
 			buffer[size] = '\0';
 			return size + 1;
 		}
@@ -349,11 +415,15 @@ int rtcGetRemoteAddress(int pc, char *buffer, int size) {
 		if (!buffer)
 			throw std::invalid_argument("Unexpected null pointer");
 
+		if (size <= 0)
+			return 0;
+
 		if (auto addr = peerConnection->remoteAddress()) {
-			size = std::min(size_t(size - 1), addr->size());
-			std::copy(addr->data(), addr->data() + size, buffer);
+			const char *data = addr->data();
+			size = std::min(size - 1, int(addr->size()));
+			std::copy(data, data + size, buffer);
 			buffer[size] = '\0';
-			return size + 1;
+			return int(size + 1);
 		}
 	});
 }
@@ -365,58 +435,70 @@ int rtcGetDataChannelLabel(int dc, char *buffer, int size) {
 		if (!buffer)
 			throw std::invalid_argument("Unexpected null pointer");
 
-		if (size >= 0) {
-			string label = dataChannel->label();
-			size = std::min(size_t(size - 1), label.size());
-			std::copy(label.data(), label.data() + size, buffer);
-			buffer[size] = '\0';
-			return size + 1;
-		} else {
+		if (size <= 0)
 			return 0;
-		}
+
+		string label = dataChannel->label();
+		const char *data = label.data();
+		size = std::min(size - 1, int(label.size()));
+		std::copy(data, data + size, buffer);
+		buffer[size] = '\0';
+		return int(size + 1);
 	});
 }
 
-int rtcSetOpenCallback(int id, openCallbackFunc cb) {
+int rtcSetOpenCallback(int id, rtcOpenCallbackFunc cb) {
 	return WRAP({
 		auto channel = getChannel(id);
 		if (cb)
-			channel->onOpen([id, cb]() { cb(getUserPointer(id)); });
+			channel->onOpen([id, cb]() {
+				if (auto ptr = getUserPointer(id))
+					cb(*ptr);
+			});
 		else
 			channel->onOpen(nullptr);
 	});
 }
 
-int rtcSetClosedCallback(int id, closedCallbackFunc cb) {
+int rtcSetClosedCallback(int id, rtcClosedCallbackFunc cb) {
 	return WRAP({
 		auto channel = getChannel(id);
 		if (cb)
-			channel->onClosed([id, cb]() { cb(getUserPointer(id)); });
+			channel->onClosed([id, cb]() {
+				if (auto ptr = getUserPointer(id))
+					cb(*ptr);
+			});
 		else
 			channel->onClosed(nullptr);
 	});
 }
 
-int rtcSetErrorCallback(int id, errorCallbackFunc cb) {
+int rtcSetErrorCallback(int id, rtcErrorCallbackFunc cb) {
 	return WRAP({
 		auto channel = getChannel(id);
 		if (cb)
-			channel->onError(
-			    [id, cb](const string &error) { cb(error.c_str(), getUserPointer(id)); });
+			channel->onError([id, cb](const string &error) {
+				if (auto ptr = getUserPointer(id))
+					cb(error.c_str(), *ptr);
+			});
 		else
 			channel->onError(nullptr);
 	});
 }
 
-int rtcSetMessageCallback(int id, messageCallbackFunc cb) {
+int rtcSetMessageCallback(int id, rtcMessageCallbackFunc cb) {
 	return WRAP({
 		auto channel = getChannel(id);
 		if (cb)
 			channel->onMessage(
 			    [id, cb](const binary &b) {
-				    cb(reinterpret_cast<const char *>(b.data()), b.size(), getUserPointer(id));
+				    if (auto ptr = getUserPointer(id))
+					    cb(reinterpret_cast<const char *>(b.data()), int(b.size()), *ptr);
 			    },
-			    [id, cb](const string &s) { cb(s.c_str(), -1, getUserPointer(id)); });
+			    [id, cb](const string &s) {
+				    if (auto ptr = getUserPointer(id))
+					    cb(s.c_str(), -int(s.size() + 1), *ptr);
+			    });
 		else
 			channel->onMessage(nullptr);
 	});
@@ -435,7 +517,7 @@ int rtcSendMessage(int id, const char *data, int size) {
 			return size;
 		} else {
 			string str(data);
-			int len = str.size();
+			int len = int(str.size());
 			channel->send(std::move(str));
 			return len;
 		}
@@ -456,11 +538,14 @@ int rtcSetBufferedAmountLowThreshold(int id, int amount) {
 	});
 }
 
-int rtcSetBufferedAmountLowCallback(int id, bufferedAmountLowCallbackFunc cb) {
+int rtcSetBufferedAmountLowCallback(int id, rtcBufferedAmountLowCallbackFunc cb) {
 	return WRAP({
 		auto channel = getChannel(id);
 		if (cb)
-			channel->onBufferedAmountLow([id, cb]() { cb(getUserPointer(id)); });
+			channel->onBufferedAmountLow([id, cb]() {
+				if (auto ptr = getUserPointer(id))
+					cb(*ptr);
+			});
 		else
 			channel->onBufferedAmountLow(nullptr);
 	});
@@ -470,11 +555,14 @@ int rtcGetAvailableAmount(int id) {
 	return WRAP({ return int(getChannel(id)->availableAmount()); });
 }
 
-int rtcSetAvailableCallback(int id, availableCallbackFunc cb) {
+int rtcSetAvailableCallback(int id, rtcAvailableCallbackFunc cb) {
 	return WRAP({
 		auto channel = getChannel(id);
 		if (cb)
-			channel->onOpen([id, cb]() { cb(getUserPointer(id)); });
+			channel->onOpen([id, cb]() {
+				if (auto ptr = getUserPointer(id))
+					cb(*ptr);
+			});
 		else
 			channel->onOpen(nullptr);
 	});

src/sctptransport.cpp

@@ -24,7 +24,7 @@
 #include <thread>
 #include <vector>
 
-#ifdef USE_JUICE
+#if !USE_NICE
 #ifndef __APPLE__
 // libjuice enables Linux path MTU discovery or sets the DF flag
 #define USE_PMTUD 1
@@ -32,7 +32,7 @@
 // Setting the DF flag is not available on Mac OS
 #define USE_PMTUD 0
 #endif
-#else
+#else // USE_NICE == 1
 #ifdef __linux__
 // Linux UDP does path MTU discovery by default (setting DF and returning EMSGSIZE)
 // It should be safe to enable discovery for SCTP.
@@ -50,6 +50,9 @@ using std::shared_ptr;
 
 namespace rtc {
 
+std::unordered_set<SctpTransport *> SctpTransport::Instances;
+std::shared_mutex SctpTransport::InstancesMutex;
+
 void SctpTransport::Init() {
 	usrsctp_init(0, &SctpTransport::WriteCallback, nullptr);
 	usrsctp_sysctl_set_sctp_ecn_enable(0);
@@ -92,6 +95,11 @@ SctpTransport::SctpTransport(std::shared_ptr<Transport> lower, uint16_t port,
 	PLOG_DEBUG << "Initializing SCTP transport";
 
 	usrsctp_register_address(this);
+	{
+		std::unique_lock lock(InstancesMutex);
+		Instances.insert(this);
+	}
+
 	mSock = usrsctp_socket(AF_CONN, SOCK_STREAM, IPPROTO_SCTP, &SctpTransport::RecvCallback,
 	                       &SctpTransport::SendCallback, 0, this);
 	if (!mSock)
@@ -186,14 +194,21 @@ SctpTransport::SctpTransport(std::shared_ptr<Transport> lower, uint16_t port,
 
 SctpTransport::~SctpTransport() {
 	stop();
-
-	if (mSock)
-		usrsctp_close(mSock);
+	close();
 
 	usrsctp_deregister_address(this);
+	{
+		std::unique_lock lock(InstancesMutex);
+		Instances.erase(this);
+	}
 }
 
 bool SctpTransport::stop() {
+	// Transport::stop() will unregister incoming() from the lower layer, therefore we need to make
+	// sure the thread from lower layers is not blocked in incoming() by the WrittenOnce condition.
+	mWrittenOnce = true;
+	mWrittenCondition.notify_all();
+
 	if (!Transport::stop())
 		return false;
 
@@ -204,6 +219,13 @@ bool SctpTransport::stop() {
 	return true;
 }
 
+void SctpTransport::close() {
+	if (mSock) {
+		usrsctp_close(mSock);
+		mSock = nullptr;
+	}
+}
+
 void SctpTransport::connect() {
 	if (!mSock)
 		return;
@@ -240,9 +262,7 @@ void SctpTransport::shutdown() {
 		PLOG_WARNING << "SCTP shutdown failed, errno=" << errno;
 	}
 
-	// close() abort the connection when linger is disabled, call it now
-	usrsctp_close(mSock);
-	mSock = nullptr;
+	close();
 
 	PLOG_INFO << "SCTP disconnected";
 	changeState(State::Disconnected);
@@ -262,11 +282,11 @@ bool SctpTransport::send(message_ptr message) {
 		return true;
 
 	mSendQueue.push(message);
-	updateBufferedAmount(message->stream, message_size_func(message));
+	updateBufferedAmount(uint16_t(message->stream), long(message_size_func(message)));
 	return false;
 }
 
-void SctpTransport::close(unsigned int stream) {
+void SctpTransport::closeStream(unsigned int stream) {
 	send(make_message(0, Message::Reset, uint16_t(stream)));
 }
 
@@ -302,7 +322,7 @@ bool SctpTransport::trySendQueue() {
 		if (!trySendMessage(message))
 			return false;
 		mSendQueue.pop();
-		updateBufferedAmount(message->stream, -message_size_func(message));
+		updateBufferedAmount(uint16_t(message->stream), -long(message_size_func(message)));
 	}
 	return true;
 }
@@ -324,7 +344,7 @@ bool SctpTransport::trySendMessage(message_ptr message) {
 		ppid = PPID_CONTROL;
 		break;
 	case Message::Reset:
-		sendReset(message->stream);
+		sendReset(uint16_t(message->stream));
 		return true;
 	default:
 		// Ignore
@@ -405,7 +425,7 @@ void SctpTransport::updateBufferedAmount(uint16_t streamId, long delta) {
 	try {
 		mBufferedAmountCallback(streamId, amount);
 	} catch (const std::exception &e) {
-		PLOG_WARNING << "SCTP buffered amount callback: " << e.what();
+		PLOG_DEBUG << "SCTP buffered amount callback: " << e.what();
 	}
 	mSendMutex.lock();
 }
@@ -431,7 +451,7 @@ void SctpTransport::sendReset(uint16_t streamId) {
 		mWrittenCondition.wait_for(lock, 1000ms,
 		                           [&]() { return mWritten || state() != State::Connected; });
 	} else if (errno == EINVAL) {
-		PLOG_VERBOSE << "SCTP stream " << streamId << " already reset";
+		PLOG_DEBUG << "SCTP stream " << streamId << " already reset";
 	} else {
 		PLOG_WARNING << "SCTP reset stream " << streamId << " failed, errno=" << errno;
 	}
@@ -448,32 +468,36 @@ bool SctpTransport::safeFlush() {
 	}
 }
 
-int SctpTransport::handleRecv(struct socket *sock, union sctp_sockstore addr, const byte *data,
-                              size_t len, struct sctp_rcvinfo info, int flags) {
+int SctpTransport::handleRecv(struct socket * /*sock*/, union sctp_sockstore /*addr*/,
+                              const byte *data, size_t len, struct sctp_rcvinfo info, int flags) {
 	try {
 		PLOG_VERBOSE << "Handle recv, len=" << len;
 		if (!len)
-			return -1;
+			return 0; // Ignore
 
-		// This is valid because SCTP_FRAGMENT_INTERLEAVE is set to level 0
-		// so partial messages and notifications may not be interleaved.
-		if (flags & MSG_EOR) {
-			if (!mPartialRecv.empty()) {
-				mPartialRecv.insert(mPartialRecv.end(), data, data + len);
-				data = mPartialRecv.data();
-				len = mPartialRecv.size();
+		// SCTP_FRAGMENT_INTERLEAVE does not seem to work as expected for messages > 64KB,
+		// therefore partial notifications and messages need to be handled separately.
+		if (flags & MSG_NOTIFICATION) {
+			// SCTP event notification
+			mPartialNotification.insert(mPartialNotification.end(), data, data + len);
+			if (flags & MSG_EOR) {
+				// Notification is complete, process it
+				processNotification(
+				    reinterpret_cast<const union sctp_notification *>(mPartialNotification.data()),
+				    mPartialNotification.size());
+				mPartialNotification.clear();
 			}
-			// Message/Notification is complete, process it
-			if (flags & MSG_NOTIFICATION)
-				processNotification(reinterpret_cast<const union sctp_notification *>(data), len);
-			else
-				processData(data, len, info.rcv_sid, PayloadId(htonl(info.rcv_ppid)));
-
-			mPartialRecv.clear();
 		} else {
-			// Message/Notification is not complete
-			mPartialRecv.insert(mPartialRecv.end(), data, data + len);
+			// SCTP message
+			mPartialMessage.insert(mPartialMessage.end(), data, data + len);
+			if (flags & MSG_EOR) {
+				// Message is complete, process it
+				processData(std::move(mPartialMessage), info.rcv_sid,
+				            PayloadId(htonl(info.rcv_ppid)));
+				mPartialMessage.clear();
+			}
 		}
+
 	} catch (const std::exception &e) {
 		PLOG_ERROR << "SCTP recv: " << e.what();
 		return -1;
@@ -486,11 +510,11 @@ int SctpTransport::handleSend(size_t free) {
 	return safeFlush() ? 0 : -1;
 }
 
-int SctpTransport::handleWrite(byte *data, size_t len, uint8_t tos, uint8_t set_df) {
+int SctpTransport::handleWrite(byte *data, size_t len, uint8_t /*tos*/, uint8_t /*set_df*/) {
 	try {
+		std::unique_lock lock(mWriteMutex);
 		PLOG_VERBOSE << "Handle write, len=" << len;
 
-		std::unique_lock lock(mWriteMutex);
 		if (!outgoing(make_message(data, data + len)))
 			return -1;
 
@@ -505,62 +529,56 @@ int SctpTransport::handleWrite(byte *data, size_t len, uint8_t tos, uint8_t set_
 	return 0; // success
 }
 
-void SctpTransport::processData(const byte *data, size_t len, uint16_t sid, PayloadId ppid) {
-	PLOG_VERBOSE << "Process data, len=" << len;
+void SctpTransport::processData(binary &&data, uint16_t sid, PayloadId ppid) {
+	PLOG_VERBOSE << "Process data, size=" << data.size();
 
 	// The usage of the PPIDs "WebRTC String Partial" and "WebRTC Binary Partial" is deprecated.
 	// See https://tools.ietf.org/html/draft-ietf-rtcweb-data-channel-13#section-6.6
 	// We handle them at reception for compatibility reasons but should never send them.
 	switch (ppid) {
 	case PPID_CONTROL:
-		recv(make_message(data, data + len, Message::Control, sid));
+		recv(make_message(std::move(data), Message::Control, sid));
 		break;
 
 	case PPID_STRING_PARTIAL: // deprecated
-		mPartialStringData.insert(mPartialStringData.end(), data, data + len);
+		mPartialStringData.insert(mPartialStringData.end(), data.begin(), data.end());
 		break;
 
 	case PPID_STRING:
 		if (mPartialStringData.empty()) {
-			mBytesReceived += len;
-			recv(make_message(data, data + len, Message::String, sid));
+			mBytesReceived += data.size();
+			recv(make_message(std::move(data), Message::String, sid));
 		} else {
-			mPartialStringData.insert(mPartialStringData.end(), data, data + len);
+			mPartialStringData.insert(mPartialStringData.end(), data.begin(), data.end());
 			mBytesReceived += mPartialStringData.size();
-			recv(make_message(mPartialStringData.begin(), mPartialStringData.end(), Message::String,
-			                  sid));
+			recv(make_message(std::move(mPartialStringData), Message::String, sid));
 			mPartialStringData.clear();
 		}
 		break;
 
 	case PPID_STRING_EMPTY:
-		// This only accounts for when the partial data is empty
-		recv(make_message(mPartialStringData.begin(), mPartialStringData.end(), Message::String,
-		                  sid));
+		recv(make_message(std::move(mPartialStringData), Message::String, sid));
 		mPartialStringData.clear();
 		break;
 
 	case PPID_BINARY_PARTIAL: // deprecated
-		mPartialBinaryData.insert(mPartialBinaryData.end(), data, data + len);
+		mPartialBinaryData.insert(mPartialBinaryData.end(), data.begin(), data.end());
 		break;
 
 	case PPID_BINARY:
 		if (mPartialBinaryData.empty()) {
-			mBytesReceived += len;
-			recv(make_message(data, data + len, Message::Binary, sid));
+			mBytesReceived += data.size();
+			recv(make_message(std::move(data), Message::Binary, sid));
 		} else {
-			mPartialBinaryData.insert(mPartialBinaryData.end(), data, data + len);
-			mBytesReceived += mPartialStringData.size();
-			recv(make_message(mPartialBinaryData.begin(), mPartialBinaryData.end(), Message::Binary,
-			                  sid));
+			mPartialBinaryData.insert(mPartialBinaryData.end(), data.begin(), data.end());
+			mBytesReceived += mPartialBinaryData.size();
+			recv(make_message(std::move(mPartialBinaryData), Message::Binary, sid));
 			mPartialBinaryData.clear();
 		}
 		break;
 
 	case PPID_BINARY_EMPTY:
-		// This only accounts for when the partial data is empty
-		recv(make_message(mPartialBinaryData.begin(), mPartialBinaryData.end(), Message::Binary,
-		                  sid));
+		recv(make_message(std::move(mPartialBinaryData), Message::Binary, sid));
 		mPartialBinaryData.clear();
 		break;
 
@@ -614,7 +632,7 @@ void SctpTransport::processNotification(const union sctp_notification *notify, s
 		if (flags & SCTP_STREAM_RESET_OUTGOING_SSN) {
 			for (int i = 0; i < count; ++i) {
 				uint16_t streamId = reset_event.strreset_stream_list[i];
-				close(streamId);
+				closeStream(streamId);
 			}
 		}
 		if (flags & SCTP_STREAM_RESET_INCOMING_SSN) {
@@ -658,8 +676,16 @@ std::optional<milliseconds> SctpTransport::rtt() {
 
 int SctpTransport::RecvCallback(struct socket *sock, union sctp_sockstore addr, void *data,
                                 size_t len, struct sctp_rcvinfo recv_info, int flags, void *ptr) {
-	int ret = static_cast<SctpTransport *>(ptr)->handleRecv(
-	    sock, addr, static_cast<const byte *>(data), len, recv_info, flags);
+	auto *transport = static_cast<SctpTransport *>(ptr);
+
+	std::shared_lock lock(InstancesMutex);
+	if (Instances.find(transport) == Instances.end()) {
+		free(data);
+		return -1;
+	}
+
+	int ret =
+	    transport->handleRecv(sock, addr, static_cast<const byte *>(data), len, recv_info, flags);
 	free(data);
 	return ret;
 }
@@ -672,12 +698,25 @@ int SctpTransport::SendCallback(struct socket *sock, uint32_t sb_free) {
 
 	auto sconn = reinterpret_cast<struct sockaddr_conn *>(&paddrinfo.spinfo_address);
 	void *ptr = sconn->sconn_addr;
-	return static_cast<SctpTransport *>(ptr)->handleSend(size_t(sb_free));
+	auto *transport = static_cast<SctpTransport *>(ptr);
+
+	std::shared_lock lock(InstancesMutex);
+	if (Instances.find(transport) == Instances.end())
+		return -1;
+
+	return transport->handleSend(size_t(sb_free));
 }
 
 int SctpTransport::WriteCallback(void *ptr, void *data, size_t len, uint8_t tos, uint8_t set_df) {
-	return static_cast<SctpTransport *>(ptr)->handleWrite(static_cast<byte *>(data), len, tos,
-	                                                      set_df);
+	auto *transport = static_cast<SctpTransport *>(ptr);
+
+	// Workaround for sctplab/usrsctp#405: Send callback is invoked on already closed socket
+	// https://github.com/sctplab/usrsctp/issues/405
+	std::shared_lock lock(InstancesMutex);
+	if (Instances.find(transport) == Instances.end())
+		return -1;
+
+	return transport->handleWrite(static_cast<byte *>(data), len, tos, set_df);
 }
 
 } // namespace rtc

src/sctptransport.hpp

@@ -28,6 +28,8 @@
 #include <functional>
 #include <map>
 #include <mutex>
+#include <shared_mutex>
+#include <unordered_set>
 
 #include "usrsctp.h"
 
@@ -46,7 +48,7 @@ public:
 
 	bool stop() override;
 	bool send(message_ptr message) override; // false if buffered
-	void close(unsigned int stream);
+	void closeStream(unsigned int stream);
 	void flush();
 
 	// Stats
@@ -70,6 +72,7 @@ private:
 
 	void connect();
 	void shutdown();
+	void close();
 	void incoming(message_ptr message) override;
 
 	bool trySendQueue();
@@ -83,7 +86,7 @@ private:
 	int handleSend(size_t free);
 	int handleWrite(byte *data, size_t len, uint8_t tos, uint8_t set_df);
 
-	void processData(const byte *data, size_t len, uint16_t streamId, PayloadId ppid);
+	void processData(binary &&data, uint16_t streamId, PayloadId ppid);
 	void processNotification(const union sctp_notification *notify, size_t len);
 
 	const uint16_t mPort;
@@ -99,7 +102,8 @@ private:
 	std::atomic<bool> mWritten = false; // written outside lock
 	std::atomic<bool> mWrittenOnce = false; // same
 
-	binary mPartialRecv, mPartialStringData, mPartialBinaryData;
+	binary mPartialMessage, mPartialNotification;
+	binary mPartialStringData, mPartialBinaryData;
 
 	// Stats
 	std::atomic<size_t> mBytesSent = 0, mBytesReceived = 0;
@@ -108,6 +112,9 @@ private:
 	                        struct sctp_rcvinfo recv_info, int flags, void *user_data);
 	static int SendCallback(struct socket *sock, uint32_t sb_free);
 	static int WriteCallback(void *sctp_ptr, void *data, size_t len, uint8_t tos, uint8_t set_df);
+
+	static std::unordered_set<SctpTransport *> Instances;
+	static std::shared_mutex InstancesMutex;
 };
 
 } // namespace rtc

src/tcptransport.cpp

@@ -21,6 +21,7 @@
 #if RTC_ENABLE_WEBSOCKET
 
 #include <exception>
+
 #ifndef _WIN32
 #include <fcntl.h>
 #include <unistd.h>
@@ -37,8 +38,8 @@ SelectInterrupter::SelectInterrupter() {
 		throw std::runtime_error("Failed to create pipe");
 	::fcntl(pipefd[0], F_SETFL, O_NONBLOCK);
 	::fcntl(pipefd[1], F_SETFL, O_NONBLOCK);
-	mPipeOut = pipefd[0]; // read
-	mPipeIn = pipefd[1];  // write
+	mPipeOut = pipefd[1]; // read
+	mPipeIn = pipefd[0];  // write
 #endif
 }
 
@@ -61,11 +62,8 @@ int SelectInterrupter::prepare(fd_set &readfds, fd_set &writefds) {
 	FD_SET(mDummySock, &readfds);
 	return SOCKET_TO_INT(mDummySock) + 1;
 #else
-	int ret;
-	do {
-		char dummy;
-		ret = ::read(mPipeIn, &dummy, 1);
-	} while (ret > 0);
+	char dummy;
+	::read(mPipeIn, &dummy, 1);
 	FD_SET(mPipeIn, &readfds);
 	return mPipeIn + 1;
 #endif
@@ -106,6 +104,7 @@ bool TcpTransport::stop() {
 }
 
 bool TcpTransport::send(message_ptr message) {
+	std::unique_lock lock(mSockMutex);
 	if (state() != State::Connected)
 		return false;
 
@@ -125,6 +124,7 @@ void TcpTransport::incoming(message_ptr message) {
 }
 
 bool TcpTransport::outgoing(message_ptr message) {
+	// mSockMutex must be locked
 	// If nothing is pending, try to send directly
 	// It's safe because if the queue is empty, the thread is not sending
 	if (mSendQueue.empty() && trySendMessage(message))
@@ -150,7 +150,7 @@ void TcpTransport::connect(const string &hostname, const string &service) {
 
 	for (auto p = result; p; p = p->ai_next) {
 		try {
-			connect(p->ai_addr, p->ai_addrlen);
+			connect(p->ai_addr, socklen_t(p->ai_addrlen));
 
 			PLOG_INFO << "Connected to " << hostname << ":" << service;
 			freeaddrinfo(result);
@@ -173,6 +173,7 @@ void TcpTransport::connect(const string &hostname, const string &service) {
 }
 
 void TcpTransport::connect(const sockaddr *addr, socklen_t addrlen) {
+	std::unique_lock lock(mSockMutex);
 	try {
 		char node[MAX_NUMERICNODE_LEN];
 		char serv[MAX_NUMERICSERV_LEN];
@@ -201,7 +202,7 @@ void TcpTransport::connect(const sockaddr *addr, socklen_t addrlen) {
 
 		// Initiate connection
 		int ret = ::connect(mSock, addr, addrlen);
-		if (ret < 0 && errno != EINPROGRESS) {
+		if (ret < 0 && sockerrno != SEINPROGRESS && sockerrno != SEWOULDBLOCK) {
 			std::ostringstream msg;
 			msg << "TCP connection to " << node << ":" << serv << " failed, errno=" << sockerrno;
 			throw std::runtime_error(msg.str());
@@ -247,15 +248,18 @@ void TcpTransport::connect(const sockaddr *addr, socklen_t addrlen) {
 }
 
 void TcpTransport::close() {
+	std::unique_lock lock(mSockMutex);
 	if (mSock != INVALID_SOCKET) {
 		PLOG_DEBUG << "Closing TCP socket";
 		::closesocket(mSock);
 		mSock = INVALID_SOCKET;
 	}
 	changeState(State::Disconnected);
+	interruptSelect();
 }
 
 bool TcpTransport::trySendQueue() {
+	// mSockMutex must be locked
 	while (auto next = mSendQueue.peek()) {
 		auto message = *next;
 		if (!trySendMessage(message)) {
@@ -268,17 +272,18 @@ bool TcpTransport::trySendQueue() {
 }
 
 bool TcpTransport::trySendMessage(message_ptr &message) {
+	// mSockMutex must be locked
 	auto data = reinterpret_cast<const char *>(message->data());
 	auto size = message->size();
 	while (size) {
-#if defined(__APPLE__) or defined(_WIN32)
+#if defined(__APPLE__) || defined(_WIN32)
 		int flags = 0;
 #else
 		int flags = MSG_NOSIGNAL;
 #endif
-		int len = ::send(mSock, data, size, flags);
+		int len = ::send(mSock, data, int(size), flags);
 		if (len < 0) {
-			if (errno == EAGAIN || errno == EWOULDBLOCK) {
+			if (sockerrno == SEAGAIN || sockerrno == SEWOULDBLOCK) {
 				message = make_message(message->end() - size, message->end());
 				return false;
 			} else {
@@ -313,17 +318,27 @@ void TcpTransport::runLoop() {
 		changeState(State::Connected);
 
 		while (true) {
+			std::unique_lock lock(mSockMutex);
+			if (mSock == INVALID_SOCKET)
+				break;
+
 			fd_set readfds, writefds;
 			int n = prepareSelect(readfds, writefds);
 
 			struct timeval tv;
 			tv.tv_sec = 10;
 			tv.tv_usec = 0;
+			lock.unlock();
 			int ret = ::select(n, &readfds, &writefds, NULL, &tv);
+			lock.lock();
+			if (mSock == INVALID_SOCKET)
+				break;
+
 			if (ret < 0) {
 				throw std::runtime_error("Failed to wait on socket");
 			} else if (ret == 0) {
 				PLOG_VERBOSE << "TCP is idle";
+				lock.unlock(); // unlock now since the upper layer might send on incoming
 				incoming(make_message(0));
 				continue;
 			}
@@ -335,7 +350,7 @@ void TcpTransport::runLoop() {
 				char buffer[bufferSize];
 				int len = ::recv(mSock, buffer, bufferSize, 0);
 				if (len < 0) {
-					if (errno == EAGAIN || errno == EWOULDBLOCK) {
+					if (sockerrno == SEAGAIN || sockerrno == SEWOULDBLOCK) {
 						continue;
 					} else {
 						throw std::runtime_error("Connection lost");
@@ -345,6 +360,7 @@ void TcpTransport::runLoop() {
 				if (len == 0)
 					break; // clean close
 
+				lock.unlock(); // unlock now since the upper layer might send on incoming
 				auto *b = reinterpret_cast<byte *>(buffer);
 				incoming(make_message(b, b + len));
 			}

src/tcptransport.hpp

@@ -78,6 +78,7 @@ private:
 	string mHostname, mService;
 
 	socket_t mSock = INVALID_SOCKET;
+	std::mutex mSockMutex;
 	std::thread mThread;
 	SelectInterrupter mInterrupter;
 	Queue<message_ptr> mSendQueue;

src/threadpool.cpp

@@ -0,0 +1,82 @@
+/**
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "threadpool.hpp"
+
+namespace rtc {
+
+ThreadPool &ThreadPool::Instance() {
+	// Init handles joining on cleanup
+	static ThreadPool *instance = new ThreadPool;
+	return *instance;
+}
+
+ThreadPool::~ThreadPool() { join(); }
+
+int ThreadPool::count() const {
+	std::unique_lock lock(mWorkersMutex);
+	return int(mWorkers.size());
+}
+
+void ThreadPool::spawn(int count) {
+	std::unique_lock lock(mWorkersMutex);
+	mJoining = false;
+	while (count-- > 0)
+		mWorkers.emplace_back(std::bind(&ThreadPool::run, this));
+}
+
+void ThreadPool::join() {
+	std::unique_lock lock(mWorkersMutex);
+	mJoining = true;
+	mCondition.notify_all();
+
+	for (auto &w : mWorkers)
+		w.join();
+
+	mWorkers.clear();
+}
+
+void ThreadPool::run() {
+	while (runOne()) {
+	}
+}
+
+bool ThreadPool::runOne() {
+	if (auto task = dequeue()) {
+		try {
+			task();
+		} catch (const std::exception &e) {
+			PLOG_WARNING << "Unhandled exception in task: " << e.what();
+		}
+		return true;
+	}
+	return false;
+}
+
+std::function<void()> ThreadPool::dequeue() {
+	std::unique_lock lock(mMutex);
+	mCondition.wait(lock, [this]() { return !mTasks.empty() || mJoining; });
+	if (mTasks.empty())
+		return nullptr;
+	auto task = std::move(mTasks.front());
+	mTasks.pop();
+	return task;
+}
+
+} // namespace rtc
+

src/threadpool.hpp

@@ -0,0 +1,87 @@
+/**
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef RTC_THREADPOOL_H
+#define RTC_THREADPOOL_H
+
+#include "include.hpp"
+#include "init.hpp"
+
+#include <condition_variable>
+#include <functional>
+#include <future>
+#include <memory>
+#include <mutex>
+#include <queue>
+#include <stdexcept>
+#include <thread>
+#include <vector>
+
+namespace rtc {
+
+template <class F, class... Args>
+using invoke_future_t = std::future<std::invoke_result_t<std::decay_t<F>, std::decay_t<Args>...>>;
+
+class ThreadPool final {
+public:
+	static ThreadPool &Instance();
+
+	ThreadPool(const ThreadPool &) = delete;
+	ThreadPool &operator=(const ThreadPool &) = delete;
+	ThreadPool(ThreadPool &&) = delete;
+	ThreadPool &operator=(ThreadPool &&) = delete;
+
+	int count() const;
+	void spawn(int count = 1);
+	void join();
+	void run();
+	bool runOne();
+
+	template <class F, class... Args>
+	auto enqueue(F &&f, Args &&... args) -> invoke_future_t<F, Args...>;
+
+protected:
+	ThreadPool() = default;
+	~ThreadPool();
+
+	std::function<void()> dequeue(); // returns null function if joining
+
+	std::vector<std::thread> mWorkers;
+	std::queue<std::function<void()>> mTasks;
+	std::atomic<bool> mJoining = false;
+
+	mutable std::mutex mMutex, mWorkersMutex;
+	std::condition_variable mCondition;
+};
+
+template <class F, class... Args>
+auto ThreadPool::enqueue(F &&f, Args &&... args) -> invoke_future_t<F, Args...> {
+	std::unique_lock lock(mMutex);
+	using R = std::invoke_result_t<std::decay_t<F>, std::decay_t<Args>...>;
+	auto task = std::make_shared<std::packaged_task<R()>>(
+	    std::bind(std::forward<F>(f), std::forward<Args>(args)...));
+	std::future<R> result = task->get_future();
+
+	mTasks.emplace([task = std::move(task), token = Init::Token()]() { return (*task)(); });
+	mCondition.notify_one();
+	return result;
+}
+
+} // namespace rtc
+
+#endif

src/tls.cpp

@@ -86,9 +86,8 @@ void init() {
 
 	std::lock_guard lock(mutex);
 	if (!done) {
-		OPENSSL_init_ssl(0, NULL);
-		SSL_load_error_strings();
-		ERR_load_crypto_strings();
+		OPENSSL_init_ssl(OPENSSL_INIT_LOAD_SSL_STRINGS | OPENSSL_INIT_LOAD_CRYPTO_STRINGS, nullptr);
+		OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS, nullptr);
 		done = true;
 	}
 }

src/tls.hpp

@@ -48,6 +48,11 @@ gnutls_datum_t make_datum(char *data, size_t size);
 
 #else // USE_GNUTLS==0
 
+#ifdef _WIN32
+// Include winsock2.h header first since OpenSSL may include winsock.h
+#include <winsock2.h>
+#endif
+
 #include <openssl/ssl.h>
 
 #include <openssl/bio.h>
@@ -55,6 +60,8 @@ gnutls_datum_t make_datum(char *data, size_t size);
 #include <openssl/err.h>
 #include <openssl/pem.h>
 #include <openssl/x509.h>
+#include <openssl/rsa.h>
+#include <openssl/bn.h>
 
 #ifndef BIO_EOF
 #define BIO_EOF -1

src/tlstransport.cpp

@@ -56,7 +56,6 @@ TlsTransport::TlsTransport(shared_ptr<TcpTransport> lower, string host, state_ca
 	try {
 		gnutls::check(gnutls_certificate_set_x509_system_trust(mCreds));
 		gnutls::check(gnutls_credentials_set(mSession, GNUTLS_CRD_CERTIFICATE, mCreds));
-		gnutls_session_set_verify_cert(mSession, mHost.c_str(), 0);
 
 		const char *priorities = "SECURE128:-VERS-SSL3.0:-ARCFOUR-128";
 		const char *err_pos = NULL;
@@ -72,7 +71,9 @@ TlsTransport::TlsTransport(shared_ptr<TcpTransport> lower, string host, state_ca
 		gnutls_transport_set_pull_function(mSession, ReadCallback);
 		gnutls_transport_set_pull_timeout_function(mSession, TimeoutCallback);
 
-       	mRecvThread = std::thread(&TlsTransport::runRecvLoop, this);
+		postCreation();
+
+		mRecvThread = std::thread(&TlsTransport::runRecvLoop, this);
 		registerIncoming();
 
 	} catch (...) {
@@ -123,6 +124,14 @@ void TlsTransport::incoming(message_ptr message) {
 		mIncomingQueue.stop();
 }
 
+void TlsTransport::postCreation() {
+	// Dummy
+}
+
+void TlsTransport::postHandshake() {
+	// Dummy
+}
+
 void TlsTransport::runRecvLoop() {
 	const size_t bufferSize = 4096;
 	char buffer[bufferSize];
@@ -147,6 +156,7 @@ void TlsTransport::runRecvLoop() {
 	try {
 		PLOG_INFO << "TLS handshake finished";
 		changeState(State::Connected);
+		postHandshake();
 
 		while (true) {
 			ssize_t ret;
@@ -263,15 +273,16 @@ TlsTransport::TlsTransport(shared_ptr<TcpTransport> lower, string host, state_ca
 		openssl::check(SSL_CTX_set_cipher_list(mCtx, "ALL:!LOW:!EXP:!RC4:!MD5:@STRENGTH"),
 		               "Failed to set SSL priorities");
 
+		if (!SSL_CTX_set_default_verify_paths(mCtx)) {
+			PLOG_WARNING << "SSL root CA certificates unavailable";
+		}
+
 		SSL_CTX_set_options(mCtx, SSL_OP_NO_SSLv3);
 		SSL_CTX_set_min_proto_version(mCtx, TLS1_VERSION);
 		SSL_CTX_set_read_ahead(mCtx, 1);
 		SSL_CTX_set_quiet_shutdown(mCtx, 1);
 		SSL_CTX_set_info_callback(mCtx, InfoCallback);
-
-		SSL_CTX_set_default_verify_paths(mCtx);
-		SSL_CTX_set_verify(mCtx, SSL_VERIFY_PEER, NULL);
-		SSL_CTX_set_verify_depth(mCtx, 4);
+		SSL_CTX_set_verify(mCtx, SSL_VERIFY_NONE, NULL);
 
 		if (!(mSsl = SSL_new(mCtx)))
 			throw std::runtime_error("Failed to create SSL instance");
@@ -298,6 +309,8 @@ TlsTransport::TlsTransport(shared_ptr<TcpTransport> lower, string host, state_ca
 		SSL_set_options(mSsl, SSL_OP_SINGLE_ECDH_USE);
 		SSL_set_tmp_ecdh(mSsl, ecdh.get());
 
+		postCreation();
+
 		mRecvThread = std::thread(&TlsTransport::runRecvLoop, this);
 		registerIncoming();
 
@@ -337,7 +350,7 @@ bool TlsTransport::send(message_ptr message) {
 	if (message->size() == 0)
 		return true;
 
-	int ret = SSL_write(mSsl, message->data(), message->size());
+	int ret = SSL_write(mSsl, message->data(), int(message->size()));
 	if (!openssl::check(mSsl, ret))
 		return false;
 
@@ -356,6 +369,14 @@ void TlsTransport::incoming(message_ptr message) {
 		mIncomingQueue.stop();
 }
 
+void TlsTransport::postCreation() {
+	// Dummy
+}
+
+void TlsTransport::postHandshake() {
+	// Dummy
+}
+
 void TlsTransport::runRecvLoop() {
 	const size_t bufferSize = 4096;
 	byte buffer[bufferSize];
@@ -377,6 +398,7 @@ void TlsTransport::runRecvLoop() {
 				if (SSL_is_init_finished(mSsl)) {
 					PLOG_INFO << "TLS handshake finished";
 					changeState(State::Connected);
+					postHandshake();
 				}
 			} else {
 				int ret = SSL_read(mSsl, buffer, bufferSize);
@@ -393,7 +415,7 @@ void TlsTransport::runRecvLoop() {
 
 			message_ptr message = *next;
 			if (message->size() > 0)
-				BIO_write(mInBio, message->data(), message->size()); // Input
+				BIO_write(mInBio, message->data(), int(message->size())); // Input
 			else
 				recv(message); // Pass zero-sized messages through
 		}

src/tlstransport.hpp

@@ -38,14 +38,15 @@ public:
 	static void Cleanup();
 
 	TlsTransport(std::shared_ptr<TcpTransport> lower, string host, state_callback callback);
-	~TlsTransport();
+	virtual ~TlsTransport();
 
 	bool stop() override;
 	bool send(message_ptr message) override;
 
-	void incoming(message_ptr message) override;
-
 protected:
+	virtual void incoming(message_ptr message) override;
+	virtual void postCreation();
+	virtual void postHandshake();
 	void runRecvLoop();
 
 	string mHost;

src/transport.hpp

@@ -41,12 +41,17 @@ public:
 
 	virtual ~Transport() {
 		stop();
-		if (mLower)
-			mLower->onRecv(nullptr); // doing it on stop could cause a deadlock
 	}
 
 	virtual bool stop() {
-		return !mShutdown.exchange(true);
+		if (mShutdown.exchange(true))
+			return false;
+
+		// We don't want incoming() to be called by the lower layer anymore
+		if (mLower)
+			mLower->onRecv(nullptr);
+
+		return true;
 	}
 
 	void registerIncoming() {
@@ -60,10 +65,20 @@ public:
 	virtual bool send(message_ptr message) { return outgoing(message); }
 
 protected:
-	void recv(message_ptr message) { mRecvCallback(message); }
+	void recv(message_ptr message) {
+		try {
+			mRecvCallback(message);
+		} catch (const std::exception &e) {
+			PLOG_WARNING << e.what();
+		}
+	}
 	void changeState(State state) {
-		if (mState.exchange(state) != state)
-			mStateChangeCallback(state);
+		try {
+			if (mState.exchange(state) != state)
+				mStateChangeCallback(state);
+		} catch (const std::exception &e) {
+			PLOG_WARNING << e.what();
+		}
 	}
 
 	virtual void incoming(message_ptr message) { recv(message); }

src/verifiedtlstransport.cpp

@@ -0,0 +1,70 @@
+/**
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "verifiedtlstransport.hpp"
+#include "include.hpp"
+
+#if RTC_ENABLE_WEBSOCKET
+
+using std::shared_ptr;
+using std::string;
+using std::unique_ptr;
+using std::weak_ptr;
+
+namespace rtc {
+
+#if USE_GNUTLS
+
+VerifiedTlsTransport::VerifiedTlsTransport(shared_ptr<TcpTransport> lower, string host,
+                                           state_callback callback)
+    : TlsTransport(std::move(lower), std::move(host), std::move(callback)) {}
+
+VerifiedTlsTransport::~VerifiedTlsTransport() {}
+
+void VerifiedTlsTransport::postCreation() {
+	PLOG_DEBUG << "Setting up TLS certificate verification";
+	gnutls_session_set_verify_cert(mSession, mHost.c_str(), 0);
+}
+
+void VerifiedTlsTransport::postHandshake() {
+	// Nothing to do
+}
+
+#else // USE_GNUTLS==0
+
+VerifiedTlsTransport::VerifiedTlsTransport(shared_ptr<TcpTransport> lower, string host,
+                                           state_callback callback)
+    : TlsTransport(std::move(lower), std::move(host), std::move(callback)) {}
+
+VerifiedTlsTransport::~VerifiedTlsTransport() {}
+
+void VerifiedTlsTransport::postCreation() {
+	PLOG_DEBUG << "Setting up TLS certificate verification";
+	SSL_set_verify(mSsl, SSL_VERIFY_PEER, NULL);
+	SSL_set_verify_depth(mSsl, 4);
+}
+
+void VerifiedTlsTransport::postHandshake() {
+	// Nothing to do
+}
+
+#endif
+
+} // namespace rtc
+
+#endif

src/verifiedtlstransport.hpp

@@ -0,0 +1,42 @@
+/**
+ * Copyright (c) 2020 Paul-Louis Ageneau
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef RTC_VERIFIED_TLS_TRANSPORT_H
+#define RTC_VERIFIED_TLS_TRANSPORT_H
+
+#include "tlstransport.hpp"
+
+#if RTC_ENABLE_WEBSOCKET
+
+namespace rtc {
+
+class VerifiedTlsTransport final : public TlsTransport {
+public:
+	VerifiedTlsTransport(std::shared_ptr<TcpTransport> lower, string host, state_callback callback);
+	~VerifiedTlsTransport();
+
+protected:
+	void postCreation() override;
+	void postHandshake() override;
+};
+
+} // namespace rtc
+
+#endif
+
+#endif

src/websocket.cpp

@@ -18,11 +18,13 @@
 
 #if RTC_ENABLE_WEBSOCKET
 
-#include "include.hpp"
 #include "websocket.hpp"
+#include "include.hpp"
+#include "threadpool.hpp"
 
 #include "tcptransport.hpp"
 #include "tlstransport.hpp"
+#include "verifiedtlstransport.hpp"
 #include "wstransport.hpp"
 
 #include <regex>
@@ -33,7 +35,12 @@
 
 namespace rtc {
 
-WebSocket::WebSocket() { PLOG_VERBOSE << "Creating WebSocket"; }
+using std::shared_ptr;
+
+WebSocket::WebSocket(std::optional<Configuration> config)
+    : mConfig(config ? std::move(*config) : Configuration()) {
+	PLOG_VERBOSE << "Creating WebSocket";
+}
 
 WebSocket::~WebSocket() {
 	PLOG_VERBOSE << "Destroying WebSocket";
@@ -148,7 +155,7 @@ void WebSocket::incoming(message_ptr message) {
 	}
 }
 
-std::shared_ptr<TcpTransport> WebSocket::initTcpTransport() {
+shared_ptr<TcpTransport> WebSocket::initTcpTransport() {
 	using State = TcpTransport::State;
 	try {
 		std::lock_guard lock(mInitMutex);
@@ -193,7 +200,7 @@ std::shared_ptr<TcpTransport> WebSocket::initTcpTransport() {
 	}
 }
 
-std::shared_ptr<TlsTransport> WebSocket::initTlsTransport() {
+shared_ptr<TlsTransport> WebSocket::initTlsTransport() {
 	using State = TlsTransport::State;
 	try {
 		std::lock_guard lock(mInitMutex);
@@ -201,27 +208,40 @@ std::shared_ptr<TlsTransport> WebSocket::initTlsTransport() {
 			return transport;
 
 		auto lower = std::atomic_load(&mTcpTransport);
-		auto transport = std::make_shared<TlsTransport>(
-		    lower, mHost, [this, weak_this = weak_from_this()](State state) {
-			    auto shared_this = weak_this.lock();
-			    if (!shared_this)
-				    return;
-			    switch (state) {
-			    case State::Connected:
-				    initWsTransport();
-				    break;
-			    case State::Failed:
-				    triggerError("TCP connection failed");
-				    remoteClose();
-				    break;
-			    case State::Disconnected:
-				    remoteClose();
-				    break;
-			    default:
-				    // Ignore
-				    break;
-			    }
-		    });
+		auto stateChangeCallback = [this, weak_this = weak_from_this()](State state) {
+			auto shared_this = weak_this.lock();
+			if (!shared_this)
+				return;
+			switch (state) {
+			case State::Connected:
+				initWsTransport();
+				break;
+			case State::Failed:
+				triggerError("TCP connection failed");
+				remoteClose();
+				break;
+			case State::Disconnected:
+				remoteClose();
+				break;
+			default:
+				// Ignore
+				break;
+			}
+		};
+
+		shared_ptr<TlsTransport> transport;
+#ifdef _WIN32
+		if (!mConfig.disableTlsVerification) {
+			PLOG_WARNING << "TLS certificate verification with root CA is not supported on Windows";
+		}
+		transport = std::make_shared<TlsTransport>(lower, mHost, stateChangeCallback);
+#else
+		if (mConfig.disableTlsVerification)
+			transport = std::make_shared<TlsTransport>(lower, mHost, stateChangeCallback);
+		else
+			transport = std::make_shared<VerifiedTlsTransport>(lower, mHost, stateChangeCallback);
+#endif
+
 		std::atomic_store(&mTlsTransport, transport);
 		if (mState == WebSocket::State::Closed) {
 			mTlsTransport.reset();
@@ -236,14 +256,14 @@ std::shared_ptr<TlsTransport> WebSocket::initTlsTransport() {
 	}
 }
 
-std::shared_ptr<WsTransport> WebSocket::initWsTransport() {
+shared_ptr<WsTransport> WebSocket::initWsTransport() {
 	using State = WsTransport::State;
 	try {
 		std::lock_guard lock(mInitMutex);
 		if (auto transport = std::atomic_load(&mWsTransport))
 			return transport;
 
-		std::shared_ptr<Transport> lower = std::atomic_load(&mTlsTransport);
+		shared_ptr<Transport> lower = std::atomic_load(&mTlsTransport);
 		if (!lower)
 			lower = std::atomic_load(&mTcpTransport);
 		auto transport = std::make_shared<WsTransport>(
@@ -297,25 +317,22 @@ void WebSocket::closeTransports() {
 	// Reset callbacks now that state is changed
 	resetCallbacks();
 
-	// Pass the references to a thread, allowing to terminate a transport from its own thread
+	// Pass the pointers to a thread, allowing to terminate a transport from its own thread
 	auto ws = std::atomic_exchange(&mWsTransport, decltype(mWsTransport)(nullptr));
 	auto tls = std::atomic_exchange(&mTlsTransport, decltype(mTlsTransport)(nullptr));
 	auto tcp = std::atomic_exchange(&mTcpTransport, decltype(mTcpTransport)(nullptr));
-	if (ws || tls || tcp) {
-		std::thread t([ws, tls, tcp, token = mInitToken]() mutable {
-			if (ws)
-				ws->stop();
-			if (tls)
-				tls->stop();
-			if (tcp)
-				tcp->stop();
+	ThreadPool::Instance().enqueue([ws, tls, tcp]() mutable {
+		if (ws)
+			ws->stop();
+		if (tls)
+			tls->stop();
+		if (tcp)
+			tcp->stop();
 
-			ws.reset();
-			tls.reset();
-			tcp.reset();
-		});
-		t.detach();
-	}
+		ws.reset();
+		tls.reset();
+		tcp.reset();
+	});
 }
 
 } // namespace rtc

src/wstransport.cpp

@@ -50,7 +50,7 @@ using std::to_integer;
 using std::to_string;
 
 using random_bytes_engine =
-    std::independent_bits_engine<std::default_random_engine, CHAR_BIT, unsigned char>;
+    std::independent_bits_engine<std::default_random_engine, CHAR_BIT, unsigned short>;
 
 WsTransport::WsTransport(std::shared_ptr<Transport> lower, string host, string path,
                          message_callback recvCallback, state_callback stateCallback)
@@ -145,12 +145,12 @@ void WsTransport::close() {
 bool WsTransport::sendHttpRequest() {
 	changeState(State::Connecting);
 
-	auto seed = system_clock::now().time_since_epoch().count();
+	auto seed = static_cast<unsigned int>(system_clock::now().time_since_epoch().count());
 	random_bytes_engine generator(seed);
 
 	binary key(16);
 	auto k = reinterpret_cast<uint8_t *>(key.data());
-	std::generate(k, k + key.size(), generator);
+	std::generate(k, k + key.size(), [&]() { return uint8_t(generator()); });
 
 	const string request = "GET " + mPath +
 	                       " HTTP/1.1\r\n"
@@ -283,7 +283,7 @@ size_t WsTransport::readFrame(byte *buffer, size_t size, Frame &frame) {
 		cur += 4;
 	}
 
-	if (end - cur < frame.length)
+	if (size_t(end - cur) < frame.length)
 		return 0;
 
 	frame.payload = cur;
@@ -292,7 +292,7 @@ size_t WsTransport::readFrame(byte *buffer, size_t size, Frame &frame) {
 			frame.payload[i] ^= maskingKey[i % 4];
 	cur += frame.length;
 
-	return cur - buffer;
+	return size_t(cur - buffer);
 }
 
 void WsTransport::recvFrame(const Frame &frame) {
@@ -378,13 +378,13 @@ bool WsTransport::sendFrame(const Frame &frame) {
 	}
 
 	if (frame.mask) {
-		auto seed = system_clock::now().time_since_epoch().count();
+		auto seed = static_cast<unsigned int>(system_clock::now().time_since_epoch().count());
 		random_bytes_engine generator(seed);
 
 		byte *maskingKey = reinterpret_cast<byte *>(cur);
 
 		auto u = reinterpret_cast<uint8_t *>(maskingKey);
-		std::generate(u, u + 4, generator);
+		std::generate(u, u + 4, [&]() { return uint8_t(generator()); });
 		cur += 4;
 
 		for (size_t i = 0; i < frame.length; ++i)

test/benchmark.cpp

@@ -95,13 +95,12 @@ size_t benchmark(milliseconds duration) {
 	fill(messageData.begin(), messageData.end(), byte(0xFF));
 
 	atomic<size_t> receivedSize = 0;
-	atomic<bool> finished = false;
 
 	steady_clock::time_point startTime, openTime, receivedTime, endTime;
 
 	shared_ptr<DataChannel> dc2;
 	pc2->onDataChannel(
-	    [&dc2, &finished, &receivedSize, &receivedTime, &endTime](shared_ptr<DataChannel> dc) {
+	    [&dc2, &receivedSize, &receivedTime](shared_ptr<DataChannel> dc) {
 		    dc->onMessage([&receivedTime, &receivedSize](const variant<binary, string> &message) {
 			    if (holds_alternative<binary>(message)) {
 				    const auto &bin = get<binary>(message);
@@ -111,11 +110,7 @@ size_t benchmark(milliseconds duration) {
 			    }
 		    });
 
-		    dc->onClosed([&finished, &endTime]() {
-			    cout << "DataChannel closed." << endl;
-			    endTime = steady_clock::now();
-			    finished = true;
-		    });
+		    dc->onClosed([]() { cout << "DataChannel closed." << endl; });
 
 		    std::atomic_store(&dc2, dc);
 	    });
@@ -157,11 +152,9 @@ size_t benchmark(milliseconds duration) {
 		cout << "Received: " << receivedSize.load() / 1000 << " KB" << endl;
 	}
 
-	if (auto adc2 = std::atomic_load(&dc2)) {
-		dc1->close();
-		while (!finished && adc2->isOpen())
-			this_thread::sleep_for(100ms);
-	}
+	dc1->close();
+
+	endTime = steady_clock::now();
 
 	auto connectDuration = duration_cast<milliseconds>(openTime - startTime);
 	auto transferDuration = duration_cast<milliseconds>(endTime - receivedTime);

test/capi.cpp

@@ -18,7 +18,6 @@
 
 #include <rtc/rtc.h>
 
-#include <cstdbool>
 #include <cstdio>
 #include <cstdlib>
 #include <cstring>
@@ -136,7 +135,7 @@ static void deletePeer(Peer *peer) {
 int test_capi_main() {
 	int attempts;
 
-	rtcInitLogger(RTC_LOG_DEBUG);
+	rtcInitLogger(RTC_LOG_DEBUG, nullptr);
 
 	// Create peer 1
 	rtcConfiguration config1;
@@ -201,7 +200,7 @@ int test_capi_main() {
 
 	// You may call rtcCleanup() when finished to free static resources
 	rtcCleanup();
-	sleep(1);
+	sleep(2);
 
 	printf("Success\n");
 	return 0;

test/connectivity.cpp

@@ -150,7 +150,7 @@ void test_connectivity() {
 
 	// You may call rtc::Cleanup() when finished to free static resources
 	rtc::Cleanup();
-	this_thread::sleep_for(1s);
+	this_thread::sleep_for(2s);
 
 	cout << "Success" << endl;
 }

test/main.cpp

@@ -18,6 +18,7 @@
 
 #include <chrono>
 #include <iostream>
+#include <thread>
 
 using namespace std;
 using namespace chrono_literals;
@@ -71,7 +72,10 @@ int main(int argc, char **argv) {
 		cout << "*** Finished WebRTC benchmark" << endl;
 	} catch (const exception &e) {
 		cerr << "WebRTC benchmark failed: " << e.what() << endl;
+		std::this_thread::sleep_for(2s);
 		return -1;
 	}
+
+	std::this_thread::sleep_for(2s);
 	return 0;
 }

test/websocket.cpp

@@ -38,6 +38,10 @@ void test_websocket() {
 
 	auto ws = std::make_shared<WebSocket>();
 
+	// Certificate verification can be disabled
+	// auto ws = std::make_shared<WebSocket>(WebSocket::Configuration{.disableTlsVerification =
+	// true});
+
 	ws->onOpen([wws = make_weak_ptr(ws), &myMessage]() {
 		auto ws = wws.lock();
 		if (!ws)
@@ -72,7 +76,7 @@ void test_websocket() {
 		throw runtime_error("Expected message not received");
 
 	ws->close();
-	this_thread::sleep_for(1s);
+	this_thread::sleep_for(2s);
 
 	// You may call rtc::Cleanup() when finished to free static resources
 	rtc::Cleanup();