should work on hardcoded port (not tested)

.gitignore

@@ -0,0 +1,22 @@
+.vs/
+*.o
+*.swp
+~*
+*~
+.idea/
+cmake-build-debug/
+cmake-build-debugandtest/
+cmake-build-release/
+*.stackdump
+*.coredump
+compile_commands.json
+/build*
+.clangd
+.cache
+
+.DS_Store
+.AppleDouble
+.LSOverride
+
+CMakeLists.txt.user*
+CMakeCache.txt

CMakeLists.txt

@@ -0,0 +1,72 @@
+cmake_minimum_required(VERSION 3.24 FATAL_ERROR)
+
+# cmake setup begin
+project(solanaceae_tox_upnp)
+
+if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+	set(SOLANACEAE_TOX_UPNP_STANDALONE ON)
+else()
+	set(SOLANACEAE_TOX_UPNP_STANDALONE OFF)
+endif()
+message("II SOLANACEAE_TOX_UPNP_STANDALONE " ${SOLANACEAE_TOX_UPNP_STANDALONE})
+
+option(SOLANACEAE_TOX_UPNP_BUILD_PLUGINS "Build the solanaceae_tox_upnp plugins" ${SOLANACEAE_TOX_UPNP_STANDALONE})
+
+if (SOLANACEAE_TOX_UPNP_STANDALONE)
+	set(CMAKE_POSITION_INDEPENDENT_CODE ON)
+
+	# defaulting to debug mode, if not specified
+	if(NOT CMAKE_BUILD_TYPE)
+		set(CMAKE_BUILD_TYPE "Debug")
+	endif()
+
+	# setup my vim ycm :D
+	set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+	# more paths
+	set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/lib")
+	set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin")
+	set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin")
+endif()
+
+# external libs
+add_subdirectory(./external EXCLUDE_FROM_ALL) # before increasing warn levels, sad :(
+
+if (SOLANACEAE_TOX_UPNP_STANDALONE)
+	set(CMAKE_CXX_EXTENSIONS OFF)
+
+	# bump up warning levels appropriately for clang, gcc & msvc
+	if (${CMAKE_CXX_COMPILER_ID} STREQUAL "GNU" OR ${CMAKE_CXX_COMPILER_ID} STREQUAL "Clang")
+		add_compile_options(
+			-Wall -Wextra # Reasonable and standard
+			-Wpedantic # Warn if non-standard C++ is used
+			-Wunused # Warn on anything being unused
+			#-Wconversion # Warn on type conversions that may lose data
+			#-Wsign-conversion # Warn on sign conversions
+			-Wshadow # Warn if a variable declaration shadows one from a parent context
+		)
+
+		if (NOT WIN32)
+			#link_libraries(-fsanitize=address)
+			#link_libraries(-fsanitize=address,undefined)
+			#link_libraries(-fsanitize-address-use-after-scope)
+			#link_libraries(-fsanitize=undefined)
+		endif()
+	elseif (${CMAKE_CXX_COMPILER_ID} STREQUAL "MSVC")
+		if (CMAKE_CXX_FLAGS MATCHES "/W[0-4]")
+			string(REGEX REPLACE "/W[0-4]" "/W4" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
+		else()
+			set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /W4")
+		endif()
+	endif()
+
+endif()
+
+# cmake setup end
+
+add_subdirectory(./src)
+
+if (SOLANACEAE_TOX_UPNP_BUILD_PLUGINS)
+	add_subdirectory(./plugins)
+endif()
+

external/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.24 FATAL_ERROR)
+
+include(FetchContent)
+
+if (NOT TARGET solanaceae_plugin)
+	FetchContent_Declare(solanaceae_plugin
+		GIT_REPOSITORY https://github.com/Green-Sky/solanaceae_plugin.git
+		GIT_TAG master
+	)
+	FetchContent_MakeAvailable(solanaceae_plugin)
+endif()
+
+if (NOT TARGET miniupnpc::miniupnpc)
+	set(UPNPC_BUILD_STATIC ON CACHE BOOL "" FORCE)
+	set(UPNPC_BUILD_SHARED OFF CACHE BOOL "" FORCE)
+	set(UPNPC_BUILD_TESTS OFF CACHE BOOL "" FORCE)
+	set(UPNPC_BUILD_SAMPLE ON CACHE BOOL "" FORCE)
+	set(UPNPC_NO_INSTALL ON CACHE BOOL "" FORCE)
+	FetchContent_Declare(miniupnpc
+		GIT_REPOSITORY https://github.com/miniupnp/miniupnp.git
+		GIT_TAG master # meh
+		SOURCE_SUBDIR miniupnpc
+	)
+	FetchContent_MakeAvailable(miniupnpc)
+endif()
+

plugins/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.9...3.24 FATAL_ERROR)
+
+########################################
+
+add_library(plugin_tox_upnp SHARED
+	./plugin_tox_upnp.cpp
+)
+target_compile_features(plugin_tox_upnp PUBLIC cxx_std_17)
+target_link_libraries(plugin_tox_upnp PUBLIC
+	solanaceae_tox_upnp
+	solanaceae_plugin
+)
+

plugins/plugin_tox_upnp.cpp

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+#include <solanaceae/plugin/solana_plugin_v1.h>
+
+#include <solanaceae/tox_upnp.hpp>
+
+#include <memory>
+#include <limits>
+#include <iostream>
+
+static std::unique_ptr<ToxUPnP> g_tox_upnp = nullptr;
+
+constexpr const char* plugin_name = "ToxUPnP";
+
+extern "C" {
+
+SOLANA_PLUGIN_EXPORT const char* solana_plugin_get_name(void) {
+	return plugin_name;
+}
+
+SOLANA_PLUGIN_EXPORT uint32_t solana_plugin_get_version(void) {
+	return SOLANA_PLUGIN_VERSION;
+}
+
+SOLANA_PLUGIN_EXPORT uint32_t solana_plugin_start(struct SolanaAPI* solana_api) {
+	std::cout << "PLUGIN " << plugin_name << " START()\n";
+
+	if (solana_api == nullptr) {
+		return 1;
+	}
+
+	try {
+		// TODO: toxI
+
+		// static store, could be anywhere tho
+		// construct with fetched dependencies
+		g_tox_upnp = std::make_unique<ToxUPnP>();
+
+		// register types
+		PLUG_PROVIDE_INSTANCE(ToxUPnP, plugin_name, g_tox_upnp.get());
+	} catch (const ResolveException& e) {
+		std::cerr << "PLUGIN " << plugin_name << " " << e.what << "\n";
+		return 2;
+	}
+
+	return 0;
+}
+
+SOLANA_PLUGIN_EXPORT void solana_plugin_stop(void) {
+	std::cout << "PLUGIN " << plugin_name << " STOP()\n";
+
+	g_tox_upnp.reset();
+}
+
+SOLANA_PLUGIN_EXPORT float solana_plugin_tick(float) {
+	return std::numeric_limits<float>::max();
+}
+
+} // extern C
+

src/CMakeLists.txt

@@ -0,0 +1,17 @@
+cmake_minimum_required(VERSION 3.9...3.24 FATAL_ERROR)
+
+project(solanaceae)
+
+#########################################
+
+add_library(solanaceae_tox_upnp
+	./solanaceae/tox_upnp.hpp
+	./solanaceae/tox_upnp.cpp
+)
+
+target_include_directories(solanaceae_tox_upnp PUBLIC .)
+target_compile_features(solanaceae_tox_upnp PUBLIC cxx_std_17)
+target_link_libraries(solanaceae_tox_upnp PUBLIC
+	miniupnpc::miniupnpc
+)
+

src/solanaceae/tox_upnp.cpp

@@ -0,0 +1,114 @@
+#include "./tox_upnp.hpp"
+
+#include <miniupnpc.h>
+#include <upnpcommands.h>
+#include <upnperrors.h>
+
+#include <chrono>
+
+#include <iostream>
+
+ToxUPnP::ToxUPnP(void) {
+	// get tox port
+
+	// start upnp thread
+	_thread = std::thread([this](void) {
+		int seconds_since_last {60*10};
+		bool last_mapping_succ {false};
+		while (!_quit) {
+			if (seconds_since_last < 60*10) {
+				std::this_thread::sleep_for(std::chrono::seconds(1));
+				seconds_since_last++;
+				continue;
+			}
+			seconds_since_last = 0;
+			last_mapping_succ = false;
+
+			// first get available devices
+			int error {0};
+			std::cerr << "TUPNP: starting search\n";
+			auto* devices = upnpDiscover(2000, nullptr, nullptr, UPNP_LOCAL_PORT_ANY, 0, 2, &error);
+			if (error != 0 || devices == nullptr) {
+				std::cerr << "TUPNP error: no device found\n";
+				continue;
+			}
+
+			std::cerr << "TUPNP: discovered devices:\n";
+			for (auto* d = devices; d != nullptr; d = d->pNext) {
+				std::cerr << "  " << d->descURL << " " << d->st << " " << d->usn << "\n";
+			}
+
+			UPNPUrls urls;
+			IGDdatas data;
+			char lanaddr[64] = "unset";
+			auto res = UPNP_GetValidIGD(devices, &urls, &data, lanaddr, sizeof(lanaddr));
+
+			if (res != 1) {
+				std::cerr << "TUPNP error: no valid connected IGD has been found\n";
+				continue;
+			}
+
+			std::cerr << "TUPNP: valid IGD found, local ip: " << lanaddr << "\n";
+
+			const auto port_string = std::to_string(_local_port);
+			auto map_ret = UPNP_AddPortMapping(
+				urls.controlURL,
+				data.first.servicetype,
+				port_string.c_str(),
+				port_string.c_str(),
+				lanaddr,
+				"Tomato UPnP Tox UDP port forwarding",
+				"UDP",
+				nullptr,
+				"900" // lease duration in seconds
+			);
+
+			if (map_ret != UPNPCOMMAND_SUCCESS) {
+				std::cerr << "TUPNP error: adding port mapping failed " << strupnperror(map_ret) << "\n";
+				continue;
+			}
+
+			char intClient[40] {};
+			char intPort[6] {};
+			char duration[16] {};
+			auto getmap_ret = UPNP_GetSpecificPortMappingEntry(
+				urls.controlURL,
+				data.first.servicetype,
+				port_string.c_str(),
+				"UDP",
+				nullptr,
+				intClient,
+				intPort,
+				nullptr,
+				nullptr,
+				duration
+			);
+
+			if (getmap_ret != UPNPCOMMAND_SUCCESS) {
+				std::cerr << "TUPNP error: getting port mapping failed " << strupnperror(getmap_ret) << "\n";
+
+				// potentially succ ???
+				last_mapping_succ = true;
+				continue;
+			}
+
+			std::cerr << "TUPNP: mapping active external :" << port_string << " is redirected to internal " << intClient << ":" << intPort << " (for " << duration << "s)\n";
+			// potentially succ
+			last_mapping_succ = true;
+
+			FreeUPNPUrls(&urls);
+			freeUPNPDevlist(devices);
+		}
+
+		// remove mapping here?
+	});
+}
+
+ToxUPnP::~ToxUPnP(void) {
+	_quit = true;
+
+	if (_thread.joinable()) {
+		_thread.join();
+	}
+}
+

src/solanaceae/tox_upnp.hpp

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <cstdint>
+#include <atomic>
+#include <thread>
+
+class ToxUPnP {
+	// TODO: ToxI& _t;
+
+	uint16_t _local_port {33445};
+
+	std::atomic_bool _quit {false};
+	std::thread _thread;
+
+	public:
+		ToxUPnP(void);
+		~ToxUPnP(void);
+};
+