First commit

.gitignore

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+build/
+*.swp
+compile_commands.json

.gitmodules

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+[submodule "lib/miniupnp"]
+	path = lib/miniupnp
+	url = https://github.com/miniupnp/miniupnp.git

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.2 FATAL_ERROR)
+project(keepupnpup CXX)
+
+if (BUILD_SHARED_LIBS)
+	set(upnp_lib_type "shared")
+	set(UPNPC_BUILD_STATIC OFF CACHE BOOL "" FORCE)
+	set(UPNPC_BUILD_SHARED ON CACHE BOOL "" FORCE)
+else()
+	set(upnp_lib_type "static")
+	set(UPNPC_BUILD_STATIC ON CACHE BOOL "" FORCE)
+	set(UPNPC_BUILD_SHARED OFF CACHE BOOL "" FORCE)
+endif()
+set(UPNPC_BUILD_TESTS OFF CACHE BOOL "" FORCE)
+set(CXX_STANDARD_REQUIRED ON)
+
+add_subdirectory(lib/miniupnp/miniupnpc)
+
+add_executable(${PROJECT_NAME}
+	src/main.cpp
+)
+
+target_include_directories(${PROJECT_NAME}
+	PRIVATE lib/miniupnp/miniupnpc
+)
+
+target_link_libraries(${PROJECT_NAME}
+	libminiupnpc-${upnp_lib_type}
+)
+
+set_property(TARGET ${PROJECT_NAME} PROPERTY CXX_STANDARD 11)

lib/miniupnp

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+Subproject commit 28d9c8e44884dea3785c533b9ef3fda6bbedc984

src/main.cpp

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+#include <iostream>
+#include "miniupnpc.h"
+#include "upnpcommands.h"
+#include "upnperrors.h"
+#include <memory>
+#include <vector>
+
+namespace {
+	class UPNPUrlsResource {
+	public:
+		UPNPUrlsResource () :
+			m_initialized(false)
+		{
+		}
+
+		~UPNPUrlsResource() noexcept {
+			if (m_initialized) {
+				m_initialized = false;
+				FreeUPNPUrls(&m_urls);
+			}
+		}
+
+		struct UPNPUrls* urls() { return &m_urls; }
+
+	private:
+		struct UPNPUrls m_urls;
+		bool m_initialized;
+	};
+
+	using UPNPDevsPtr = std::unique_ptr<struct UPNPDev, void(*)(struct UPNPDev*)>;
+
+	std::vector<struct UPNPDev*> dev_list_to_vector (struct UPNPDev* parList) {
+		std::vector<struct UPNPDev*> retval;
+		for (auto dev = parList; dev; dev = dev->pNext) {
+			retval.push_back(dev);
+		}
+		return retval;
+	}
+} //unnamed namespace
+
+int main() {
+	int error;
+	UPNPDevsPtr devlist(nullptr, &freeUPNPDevlist);
+
+	devlist.reset(upnpDiscover(
+		2000,
+		nullptr, //multicastif
+		nullptr, //minissdpdpath
+		UPNP_LOCAL_PORT_ANY, //localport
+		0, //ipv6
+		2, //ttl
+		&error
+	));
+
+	const auto devs = dev_list_to_vector(devlist.get());
+	if (devs.empty()) {
+		std::cerr << "No UPNP devices found\n";
+		return 1;
+	}
+	else if (devs.size() > 1) {
+		std::cerr << "More than one UPNP device found (" << devs.size() << "), aborting\n";
+		return 1;
+	}
+
+	std::cout << "Found: " << devs.front()->descURL << ", " << devs.front()->st << '\n';
+	//struct IGDdatas data;
+
+	return 0;
+}
+