libtgvoip/os/windows/NetworkSocketWinsock.cpp

//
// libtgvoip is free and unencumbered public domain software.
// For more information, see http://unlicense.org or the UNLICENSE file
// you should have received with this source code distribution.
//

#include <winsock2.h>
#include <ws2tcpip.h>
#include "NetworkSocketWinsock.h"
#if WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP

#else
#include <IPHlpApi.h>
#endif
#include <assert.h>
#include "../../tools/logging.h"
#include "../../VoIPController.h"
#include "WindowsSpecific.h"
#include "../../tools/Buffers.h"

using namespace tgvoip;

NetworkSocketWinsock::NetworkSocketWinsock(NetworkProtocol protocol) : NetworkSocket(protocol)
{
	needUpdateNat64Prefix = true;
	nat64Present = false;
	switchToV6at = 0;
	isV4Available = false;
	closing = false;
	fd = INVALID_SOCKET;

#ifdef TGVOIP_WINXP_COMPAT
	DWORD version = GetVersion();
	isAtLeastVista = LOBYTE(LOWORD(version)) >= 6; // Vista is 6.0, XP is 5.1 and 5.2
#else
	isAtLeastVista = true;
#endif

	WSADATA wsaData;
	WSAStartup(MAKEWORD(2, 2), &wsaData);
	LOGD("Initialized winsock, version %d.%d", wsaData.wHighVersion, wsaData.wVersion);

	if (protocol == NetworkProtocol::TCP)
		timeout = 10.0;
	lastSuccessfulOperationTime = VoIPController::GetCurrentTime();
}

NetworkSocketWinsock::~NetworkSocketWinsock()
{
}

void NetworkSocketWinsock::SetMaxPriority()
{
}

void NetworkSocketWinsock::Send(NetworkPacket &&packet)
{
	if (packet.IsEmpty() || (protocol == NetworkProtocol::UDP && packet.address.IsEmpty()))
	{
		LOGW("tried to send null packet");
		return;
	}
	int res;
	if (protocol == NetworkProtocol::UDP)
	{
		if (isAtLeastVista)
		{
			sockaddr_in6 addr;
			if (!packet.address.isIPv6)
			{
				if (needUpdateNat64Prefix && !isV4Available && VoIPController::GetCurrentTime() > switchToV6at && switchToV6at != 0)
				{
					LOGV("Updating NAT64 prefix");
					nat64Present = false;
					addrinfo *addr0;
					int res = getaddrinfo("ipv4only.arpa", NULL, NULL, &addr0);
					if (res != 0)
					{
						LOGW("Error updating NAT64 prefix: %d / %s", res, gai_strerrorA(res));
					}
					else
					{
						addrinfo *addrPtr;
						unsigned char *addr170 = NULL;
						unsigned char *addr171 = NULL;
						for (addrPtr = addr0; addrPtr; addrPtr = addrPtr->ai_next)
						{
							if (addrPtr->ai_family == AF_INET6)
							{
								sockaddr_in6 *translatedAddr = (sockaddr_in6 *)addrPtr->ai_addr;
								uint32_t v4part = *((uint32_t *)&translatedAddr->sin6_addr.s6_addr[12]);
								if (v4part == 0xAA0000C0 && !addr170)
								{
									addr170 = translatedAddr->sin6_addr.s6_addr;
								}
								if (v4part == 0xAB0000C0 && !addr171)
								{
									addr171 = translatedAddr->sin6_addr.s6_addr;
								}
								char buf[INET6_ADDRSTRLEN];
								//LOGV("Got translated address: %s", inet_ntop(AF_INET6, &translatedAddr->sin6_addr, buf, sizeof(buf)));
							}
						}
						if (addr170 && addr171 && memcmp(addr170, addr171, 12) == 0)
						{
							nat64Present = true;
							memcpy(nat64Prefix, addr170, 12);
							char buf[INET6_ADDRSTRLEN];
							//LOGV("Found nat64 prefix from %s", inet_ntop(AF_INET6, addr170, buf, sizeof(buf)));
						}
						else
						{
							LOGV("Didn't find nat64");
						}
						freeaddrinfo(addr0);
					}
					needUpdateNat64Prefix = false;
				}
				memset(&addr, 0, sizeof(sockaddr_in6));
				addr.sin6_family = AF_INET6;
				*((uint32_t *)&addr.sin6_addr.s6_addr[12]) = packet.address.addr.ipv4;
				if (nat64Present)
					memcpy(addr.sin6_addr.s6_addr, nat64Prefix, 12);
				else
					addr.sin6_addr.s6_addr[11] = addr.sin6_addr.s6_addr[10] = 0xFF;
			}
			else
			{
				memcpy(addr.sin6_addr.s6_addr, packet.address.addr.ipv6, 16);
			}
			addr.sin6_port = htons(packet.port);
			res = sendto(fd, (const char *)**packet.data, packet.data->Length(), 0, (const sockaddr *)&addr, sizeof(addr));
		}
		else
		{
			sockaddr_in addr;
			addr.sin_addr.s_addr = packet.address.addr.ipv4;
			addr.sin_port = htons(packet.port);
			addr.sin_family = AF_INET;
			res = sendto(fd, (const char *)**packet.data, packet.data->Length(), 0, (const sockaddr *)&addr, sizeof(addr));
		}
	}
	else
	{
		res = send(fd, (const char *)**packet.data, packet.data->Length(), 0);
	}
	if (res == SOCKET_ERROR)
	{
		int error = WSAGetLastError();
		if (error == WSAEWOULDBLOCK)
		{
			if (!pendingOutgoingPacket.IsEmpty())
			{
				LOGE("Got EAGAIN but there's already a pending packet");
				failed = true;
			}
			else
			{
				LOGV("Socket %d not ready to send", fd);
				pendingOutgoingPacket = std::move(packet);
				readyToSend = false;
			}
		}
		else
		{
			LOGE("error sending: %d / %s", error, WindowsSpecific::GetErrorMessage(error).c_str());
			if (error == WSAENETUNREACH && !isV4Available && VoIPController::GetCurrentTime() < switchToV6at)
			{
				switchToV6at = VoIPController::GetCurrentTime();
				LOGI("Network unreachable, trying NAT64");
			}
		}
	}
	else if (res < packet.data->Length() && protocol == NetworkProtocol::TCP)
	{
		if (!pendingOutgoingPacket.IsEmpty())
		{
			LOGE("send returned less than packet length but there's already a pending packet");
			failed = true;
		}
		else
		{
			LOGV("Socket %d not ready to send", fd);
			pendingOutgoingPacket = std::move(packet);
			Buffer pdata = std::move(pendingOutgoingPacket.data);
			pendingOutgoingPacket.data = Buffer::CopyOf(pdata, res, pdata.Length() - res);
			readyToSend = false;
		}
	}
}

bool NetworkSocketWinsock::OnReadyToSend()
{
	if (!pendingOutgoingPacket.IsEmpty())
	{
		Send(std::move(pendingOutgoingPacket));
		pendingOutgoingPacket = std::move(NetworkPacket::Empty());
		return false;
	}
	readyToSend = true;
	return true;
}

NetworkPacket NetworkSocketWinsock::Receive(size_t maxLen)
{
	if (maxLen == 0)
		maxLen = UINT32_MAX;
	if (protocol == NetworkProtocol::UDP)
	{
		if (isAtLeastVista)
		{
			int addrLen = sizeof(sockaddr_in6);
			sockaddr_in6 srcAddr;
			int res = recvfrom(fd, (char *)*recvBuf, std::min(recvBuf.Length(), maxLen), 0, (sockaddr *)&srcAddr, (socklen_t *)&addrLen);
			if (res == SOCKET_ERROR)
			{
				int error = WSAGetLastError();
				LOGE("error receiving %d / %s", error, WindowsSpecific::GetErrorMessage(error).c_str());
				return NetworkPacket::Empty();
			}
			//LOGV("Received %d bytes from %s:%d at %.5lf", len, inet_ntoa(srcAddr.sin_addr), ntohs(srcAddr.sin_port), GetCurrentTime());
			if (!isV4Available && IN6_IS_ADDR_V4MAPPED(&srcAddr.sin6_addr))
			{
				isV4Available = true;
				LOGI("Detected IPv4 connectivity, will not try IPv6");
			}
			NetworkAddress addr = NetworkAddress::Empty();
			if (IN6_IS_ADDR_V4MAPPED(&srcAddr.sin6_addr) || (nat64Present && memcmp(nat64Prefix, srcAddr.sin6_addr.s6_addr, 12) == 0))
			{
				in_addr v4addr = *((in_addr *)&srcAddr.sin6_addr.s6_addr[12]);
				addr = NetworkAddress::IPv4(v4addr.s_addr);
			}
			else
			{
				addr = NetworkAddress::IPv6(srcAddr.sin6_addr.s6_addr);
			}
			return NetworkPacket{
				Buffer::CopyOf(recvBuf, 0, (size_t)res),
				addr,
				ntohs(srcAddr.sin6_port),
				NetworkProtocol::UDP};
		}
		else
		{
			int addrLen = sizeof(sockaddr_in);
			sockaddr_in srcAddr;
			int res = recvfrom(fd, (char *)*recvBuf, std::min(recvBuf.Length(), maxLen), 0, (sockaddr *)&srcAddr, (socklen_t *)&addrLen);
			if (res == SOCKET_ERROR)
			{
				LOGE("error receiving %d", WSAGetLastError());
				return NetworkPacket::Empty();
			}
			return NetworkPacket{
				Buffer::CopyOf(recvBuf, 0, (size_t)res),
				NetworkAddress::IPv4(srcAddr.sin_addr.s_addr),
				ntohs(srcAddr.sin_port),
				NetworkProtocol::UDP};
		}
	}
	else if (protocol == NetworkProtocol::TCP)
	{
		int res = recv(fd, (char *)*recvBuf, std::min(recvBuf.Length(), maxLen), 0);
		if (res == SOCKET_ERROR)
		{
			int error = WSAGetLastError();
			LOGE("Error receiving from TCP socket: %d / %s", error, WindowsSpecific::GetErrorMessage(error).c_str());
			failed = true;
			return NetworkPacket::Empty();
		}
		else
		{
			return NetworkPacket{
				Buffer::CopyOf(recvBuf, 0, (size_t)res),
				tcpConnectedAddress,
				tcpConnectedPort,
				NetworkProtocol::TCP};
		}
	}
}

void NetworkSocketWinsock::Open()
{
	if (protocol == NetworkProtocol::UDP)
	{
		fd = socket(isAtLeastVista ? AF_INET6 : AF_INET, SOCK_DGRAM, IPPROTO_UDP);
		if (fd == INVALID_SOCKET)
		{
			int error = WSAGetLastError();
			LOGE("error creating socket: %d", error);
			failed = true;
			return;
		}

		int res;
		if (isAtLeastVista)
		{
			DWORD flag = 0;
			res = setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, (const char *)&flag, sizeof(flag));
			if (res == SOCKET_ERROR)
			{
				LOGE("error enabling dual stack socket: %d", WSAGetLastError());
				failed = true;
				return;
			}
		}

		u_long one = 1;
		ioctlsocket(fd, FIONBIO, &one);

		SetMaxPriority();

		int tries = 0;
		sockaddr *addr;
		sockaddr_in addr4;
		sockaddr_in6 addr6;
		int addrLen;
		if (isAtLeastVista)
		{
			//addr.sin6_addr.s_addr=0;
			memset(&addr6, 0, sizeof(sockaddr_in6));
			//addr.sin6_len=sizeof(sa_family_t);
			addr6.sin6_family = AF_INET6;
			addr = (sockaddr *)&addr6;
			addrLen = sizeof(addr6);
		}
		else
		{
			sockaddr_in addr4;
			addr4.sin_addr.s_addr = 0;
			addr4.sin_family = AF_INET;
			addr = (sockaddr *)&addr4;
			addrLen = sizeof(addr4);
		}
		for (tries = 0; tries < 10; tries++)
		{
			uint16_t port = htons(GenerateLocalPort());
			if (isAtLeastVista)
				((sockaddr_in6 *)addr)->sin6_port = port;
			else
				((sockaddr_in *)addr)->sin_port = port;
			res = ::bind(fd, addr, addrLen);
			LOGV("trying bind to port %u", ntohs(port));
			if (res < 0)
			{
				LOGE("error binding to port %u: %d / %s", ntohs(port), errno, strerror(errno));
			}
			else
			{
				break;
			}
		}
		if (tries == 10)
		{
			if (isAtLeastVista)
				((sockaddr_in6 *)addr)->sin6_port = 0;
			else
				((sockaddr_in *)addr)->sin_port = 0;
			res = ::bind(fd, addr, addrLen);
			if (res < 0)
			{
				LOGE("error binding to port %u: %d / %s", 0, errno, strerror(errno));
				//SetState(STATE_FAILED);
				return;
			}
		}
		getsockname(fd, addr, (socklen_t *)&addrLen);
		uint16_t localUdpPort;
		if (isAtLeastVista)
			localUdpPort = ntohs(((sockaddr_in6 *)addr)->sin6_port);
		else
			localUdpPort = ntohs(((sockaddr_in *)addr)->sin_port);
		LOGD("Bound to local UDP port %u", localUdpPort);

		needUpdateNat64Prefix = true;
		isV4Available = false;
		switchToV6at = VoIPController::GetCurrentTime() + ipv6Timeout;
	}
}

void NetworkSocketWinsock::Close()
{
	closing = true;
	failed = true;
	if (fd != INVALID_SOCKET)
		closesocket(fd);
}

void NetworkSocketWinsock::OnActiveInterfaceChanged()
{
	needUpdateNat64Prefix = true;
	isV4Available = false;
	switchToV6at = VoIPController::GetCurrentTime() + ipv6Timeout;
}

std::string NetworkSocketWinsock::GetLocalInterfaceInfo(NetworkAddress *v4addr, NetworkAddress *v6addr)
{
#if WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP
	Windows::Networking::Connectivity::ConnectionProfile ^ profile = Windows::Networking::Connectivity::NetworkInformation::GetInternetConnectionProfile();
	if (profile)
	{
		Windows::Foundation::Collections::IVectorView<Windows::Networking::HostName ^> ^ hostnames = Windows::Networking::Connectivity::NetworkInformation::GetHostNames();
		for (unsigned int i = 0; i < hostnames->Size; i++)
		{
			Windows::Networking::HostName ^ n = hostnames->GetAt(i);
			if (n->Type != Windows::Networking::HostNameType::Ipv4 && n->Type != Windows::Networking::HostNameType::Ipv6)
				continue;
			if (n->IPInformation->NetworkAdapter->Equals(profile->NetworkAdapter))
			{
				if (v4addr && n->Type == Windows::Networking::HostNameType::Ipv4)
				{
					char buf[INET_ADDRSTRLEN];
					WideCharToMultiByte(CP_UTF8, 0, n->RawName->Data(), -1, buf, sizeof(buf), NULL, NULL);
					*v4addr = NetworkAddress::IPv4(buf);
				}
				else if (v6addr && n->Type == Windows::Networking::HostNameType::Ipv6)
				{
					char buf[INET6_ADDRSTRLEN];
					WideCharToMultiByte(CP_UTF8, 0, n->RawName->Data(), -1, buf, sizeof(buf), NULL, NULL);
					*v6addr = NetworkAddress::IPv6(buf);
				}
			}
		}
		char buf[128];
		WideCharToMultiByte(CP_UTF8, 0, profile->NetworkAdapter->NetworkAdapterId.ToString()->Data(), -1, buf, sizeof(buf), NULL, NULL);
		return std::string(buf);
	}
	return "";
#else
	IP_ADAPTER_ADDRESSES *addrs = (IP_ADAPTER_ADDRESSES *)malloc(15 * 1024);
	ULONG size = 15 * 1024;
	ULONG flags = GAA_FLAG_SKIP_ANYCAST | GAA_FLAG_SKIP_MULTICAST | GAA_FLAG_SKIP_DNS_SERVER | GAA_FLAG_SKIP_FRIENDLY_NAME;

	ULONG res = GetAdaptersAddresses(AF_UNSPEC, flags, NULL, addrs, &size);
	if (res == ERROR_BUFFER_OVERFLOW)
	{
		addrs = (IP_ADAPTER_ADDRESSES *)realloc(addrs, size);
		res = GetAdaptersAddresses(AF_UNSPEC, flags, NULL, addrs, &size);
	}

	ULONG bestMetric = 0;
	std::string bestName("");

	if (res == ERROR_SUCCESS)
	{
		IP_ADAPTER_ADDRESSES *current = addrs;
		while (current)
		{
			char *name = current->AdapterName;
			LOGV("Adapter '%s':", name);
			IP_ADAPTER_UNICAST_ADDRESS *curAddr = current->FirstUnicastAddress;
			if (current->OperStatus != IfOperStatusUp)
			{
				LOGV("-> (down)");
				current = current->Next;
				continue;
			}
			if (current->IfType == IF_TYPE_SOFTWARE_LOOPBACK)
			{
				LOGV("-> (loopback)");
				current = current->Next;
				continue;
			}
			if (isAtLeastVista)
				LOGV("v4 metric: %u, v6 metric: %u", current->Ipv4Metric, current->Ipv6Metric);
			while (curAddr)
			{
				sockaddr *addr = curAddr->Address.lpSockaddr;
				if (addr->sa_family == AF_INET && v4addr)
				{
					sockaddr_in *ipv4 = (sockaddr_in *)addr;
					LOGV("-> V4: %s", V4AddressToString(ipv4->sin_addr.s_addr).c_str());
					uint32_t ip = ntohl(ipv4->sin_addr.s_addr);
					if ((ip & 0xFFFF0000) != 0xA9FE0000)
					{
						if (isAtLeastVista)
						{
							if (current->Ipv4Metric > bestMetric)
							{
								bestMetric = current->Ipv4Metric;
								bestName = std::string(current->AdapterName);
								*v4addr = NetworkAddress::IPv4(ipv4->sin_addr.s_addr);
							}
						}
						else
						{
							bestName = std::string(current->AdapterName);
							*v4addr = NetworkAddress::IPv4(ipv4->sin_addr.s_addr);
						}
					}
				}
				else if (addr->sa_family == AF_INET6 && v6addr)
				{
					sockaddr_in6 *ipv6 = (sockaddr_in6 *)addr;
					LOGV("-> V6: %s", V6AddressToString(ipv6->sin6_addr.s6_addr).c_str());
					if (!IN6_IS_ADDR_LINKLOCAL(&ipv6->sin6_addr))
					{
						*v6addr = NetworkAddress::IPv6(ipv6->sin6_addr.s6_addr);
					}
				}
				curAddr = curAddr->Next;
			}
			current = current->Next;
		}
	}

	free(addrs);
	return bestName;
#endif
}

uint16_t NetworkSocketWinsock::GetLocalPort()
{
	if (!isAtLeastVista)
	{
		sockaddr_in addr;
		size_t addrLen = sizeof(sockaddr_in);
		getsockname(fd, (sockaddr *)&addr, (socklen_t *)&addrLen);
		return ntohs(addr.sin_port);
	}
	sockaddr_in6 addr;
	size_t addrLen = sizeof(sockaddr_in6);
	getsockname(fd, (sockaddr *)&addr, (socklen_t *)&addrLen);
	return ntohs(addr.sin6_port);
}

std::string NetworkSocketWinsock::V4AddressToString(uint32_t address)
{
	char buf[INET_ADDRSTRLEN];
	sockaddr_in addr;
	ZeroMemory(&addr, sizeof(addr));
	addr.sin_family = AF_INET;
	addr.sin_addr.s_addr = address;
	DWORD len = sizeof(buf);
#if WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP
	wchar_t wbuf[INET_ADDRSTRLEN];
	ZeroMemory(wbuf, sizeof(wbuf));
	WSAAddressToStringW((sockaddr *)&addr, sizeof(addr), NULL, wbuf, &len);
	WideCharToMultiByte(CP_UTF8, 0, wbuf, -1, buf, sizeof(buf), NULL, NULL);
#else
	WSAAddressToStringA((sockaddr *)&addr, sizeof(addr), NULL, buf, &len);
#endif
	return std::string(buf);
}

std::string NetworkSocketWinsock::V6AddressToString(const unsigned char *address)
{
	char buf[INET6_ADDRSTRLEN];
	sockaddr_in6 addr;
	ZeroMemory(&addr, sizeof(addr));
	addr.sin6_family = AF_INET6;
	memcpy(addr.sin6_addr.s6_addr, address, 16);
	DWORD len = sizeof(buf);
#if WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP
	wchar_t wbuf[INET6_ADDRSTRLEN];
	ZeroMemory(wbuf, sizeof(wbuf));
	WSAAddressToStringW((sockaddr *)&addr, sizeof(addr), NULL, wbuf, &len);
	WideCharToMultiByte(CP_UTF8, 0, wbuf, -1, buf, sizeof(buf), NULL, NULL);
#else
	WSAAddressToStringA((sockaddr *)&addr, sizeof(addr), NULL, buf, &len);
#endif
	return std::string(buf);
}

uint32_t NetworkSocketWinsock::StringToV4Address(std::string address)
{
	sockaddr_in addr;
	ZeroMemory(&addr, sizeof(addr));
	addr.sin_family = AF_INET;
	int size = sizeof(addr);
#if WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP
	wchar_t buf[INET_ADDRSTRLEN];
	MultiByteToWideChar(CP_UTF8, 0, address.c_str(), -1, buf, INET_ADDRSTRLEN);
	WSAStringToAddressW(buf, AF_INET, NULL, (sockaddr *)&addr, &size);
#else
	WSAStringToAddressA((char *)address.c_str(), AF_INET, NULL, (sockaddr *)&addr, &size);
#endif
	return addr.sin_addr.s_addr;
}

void NetworkSocketWinsock::StringToV6Address(std::string address, unsigned char *out)
{
	sockaddr_in6 addr;
	ZeroMemory(&addr, sizeof(addr));
	addr.sin6_family = AF_INET6;
	int size = sizeof(addr);
#if WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP
	wchar_t buf[INET6_ADDRSTRLEN];
	MultiByteToWideChar(CP_UTF8, 0, address.c_str(), -1, buf, INET6_ADDRSTRLEN);
	WSAStringToAddressW(buf, AF_INET, NULL, (sockaddr *)&addr, &size);
#else
	WSAStringToAddressA((char *)address.c_str(), AF_INET, NULL, (sockaddr *)&addr, &size);
#endif
	memcpy(out, addr.sin6_addr.s6_addr, 16);
}

void NetworkSocketWinsock::Connect(const NetworkAddress address, uint16_t port)
{
	sockaddr_in v4;
	sockaddr_in6 v6;
	sockaddr *addr = NULL;
	size_t addrLen = 0;
	if (!address.isIPv6)
	{
		v4.sin_family = AF_INET;
		v4.sin_addr.s_addr = address.addr.ipv4;
		v4.sin_port = htons(port);
		addr = reinterpret_cast<sockaddr *>(&v4);
		addrLen = sizeof(v4);
	}
	else
	{
		v6.sin6_family = AF_INET6;
		memcpy(v6.sin6_addr.s6_addr, address.addr.ipv6, 16);
		v6.sin6_flowinfo = 0;
		v6.sin6_scope_id = 0;
		v6.sin6_port = htons(port);
		addr = reinterpret_cast<sockaddr *>(&v6);
		addrLen = sizeof(v6);
	}
	fd = socket(addr->sa_family, SOCK_STREAM, IPPROTO_TCP);
	if (fd == INVALID_SOCKET)
	{
		LOGE("Error creating TCP socket: %d", WSAGetLastError());
		failed = true;
		return;
	}
	u_long one = 1;
	ioctlsocket(fd, FIONBIO, &one);
	int opt = 1;
	setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (const char *)&opt, sizeof(opt));
	DWORD timeout = 5000;
	setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, (const char *)&timeout, sizeof(timeout));
	timeout = 60000;
	setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, (const char *)&timeout, sizeof(timeout));
	int res = connect(fd, (const sockaddr *)addr, addrLen);
	if (res != 0)
	{
		int error = WSAGetLastError();
		if (error != WSAEINPROGRESS && error != WSAEWOULDBLOCK)
		{
			LOGW("error connecting TCP socket to %s:%u: %d / %s", address.ToString().c_str(), port, error, WindowsSpecific::GetErrorMessage(error).c_str());
			closesocket(fd);
			failed = true;
			return;
		}
	}
	tcpConnectedAddress = address;
	tcpConnectedPort = port;
	LOGI("successfully connected to %s:%d", tcpConnectedAddress.ToString().c_str(), tcpConnectedPort);
}

NetworkAddress NetworkSocketWinsock::ResolveDomainName(std::string name)
{
	addrinfo *addr0;
	NetworkAddress ret = NetworkAddress::Empty();
	int res = getaddrinfo(name.c_str(), NULL, NULL, &addr0);
	if (res != 0)
	{
		LOGW("Error updating NAT64 prefix: %d / %s", res, gai_strerrorA(res));
	}
	else
	{
		addrinfo *addrPtr;
		for (addrPtr = addr0; addrPtr; addrPtr = addrPtr->ai_next)
		{
			if (addrPtr->ai_family == AF_INET)
			{
				sockaddr_in *addr = (sockaddr_in *)addrPtr->ai_addr;
				ret = NetworkAddress::IPv4(addr->sin_addr.s_addr);
				break;
			}
		}
		freeaddrinfo(addr0);
	}
	return ret;
}

NetworkAddress NetworkSocketWinsock::GetConnectedAddress()
{
	return tcpConnectedAddress;
}

uint16_t NetworkSocketWinsock::GetConnectedPort()
{
	return tcpConnectedPort;
}

void NetworkSocketWinsock::SetTimeouts(int sendTimeout, int recvTimeout)
{
	DWORD timeout = sendTimeout * 1000;
	setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, (const char *)&timeout, sizeof(timeout));
	timeout = recvTimeout * 1000;
	setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, (const char *)&timeout, sizeof(timeout));
}

bool NetworkSocketWinsock::Select(std::vector<std::shared_ptr<NetworkSocket>> &readFds, std::vector<std::shared_ptr<NetworkSocket>> &writeFds, std::vector<std::shared_ptr<NetworkSocket>> &errorFds, const std::unique_ptr<SocketSelectCanceller> &canceller)
{
	fd_set readSet;
	fd_set errorSet;
	fd_set writeSet;
	SocketSelectCancellerWin32 *canceller = dynamic_cast<SocketSelectCancellerWin32 *>(_canceller);
	timeval timeout = {0, 10000};
	bool anyFailed = false;
	int res = 0;

	do
	{
		FD_ZERO(&readSet);
		FD_ZERO(&writeSet);
		FD_ZERO(&errorSet);

		for (auto itr = readFds.begin(); itr != readFds.end(); ++itr)
		{
			int sfd = GetDescriptorFromSocket(*itr);
			if (sfd == 0)
			{
				LOGW("can't select on one of sockets because it's not a NetworkSocketWinsock instance");
				continue;
			}
			FD_SET(sfd, &readSet);
		}

		for (const auto &s : writeFds)
		{
			int sfd = GetDescriptorFromSocket(s);
			if (sfd == 0)
			{
				LOGW("can't select on one of sockets because it's not a NetworkSocketWinsock instance");
				continue;
			}
			FD_SET(sfd, &writeSet);
		}

		for (auto itr = errorFds.begin(); itr != errorFds.end(); ++itr)
		{
			int sfd = GetDescriptorFromSocket(*itr);
			if (sfd == 0)
			{
				LOGW("can't select on one of sockets because it's not a NetworkSocketWinsock instance");
				continue;
			}
			if ((*itr)->timeout > 0 && VoIPController::GetCurrentTime() - (*itr)->lastSuccessfulOperationTime > (*itr)->timeout)
			{
				LOGW("Socket %d timed out", sfd);
				(*itr)->failed = true;
			}
			anyFailed |= (*itr)->IsFailed();
			FD_SET(sfd, &errorSet);
		}
		if (canceller && canceller->canceled)
			break;
		res = select(0, &readSet, &writeSet, &errorSet, &timeout);
		//LOGV("select result %d", res);
		if (res == SOCKET_ERROR)
			LOGE("SELECT ERROR %d", WSAGetLastError());
	} while (res == 0);

	if (canceller && canceller->canceled && !anyFailed)
	{
		canceller->canceled = false;
		return false;
	}
	else if (anyFailed)
	{
		FD_ZERO(&readSet);
		FD_ZERO(&errorSet);
	}

	auto itr = readFds.begin();
	while (itr != readFds.end())
	{
		int sfd = GetDescriptorFromSocket(*itr);
		if (FD_ISSET(sfd, &readSet))
			(*itr)->lastSuccessfulOperationTime = VoIPController::GetCurrentTime();
		if (sfd == 0 || !FD_ISSET(sfd, &readSet) || !(*itr)->OnReadyToReceive())
		{
			itr = readFds.erase(itr);
		}
		else
		{
			++itr;
		}
	}

	itr = writeFds.begin();
	while (itr != writeFds.end())
	{
		int sfd = GetDescriptorFromSocket(*itr);
		if (FD_ISSET(sfd, &writeSet))
		{
			(*itr)->lastSuccessfulOperationTime = VoIPController::GetCurrentTime();
			LOGI("Socket %d is ready to send", sfd);
		}
		if (sfd == 0 || !FD_ISSET(sfd, &writeSet) || !(*itr)->OnReadyToSend())
		{
			itr = writeFds.erase(itr);
		}
		else
		{
			++itr;
		}
	}

	itr = errorFds.begin();
	while (itr != errorFds.end())
	{
		int sfd = GetDescriptorFromSocket(*itr);
		if ((sfd == 0 || !FD_ISSET(sfd, &errorSet)) && !(*itr)->IsFailed())
		{
			itr = errorFds.erase(itr);
		}
		else
		{
			++itr;
		}
	}
	//LOGV("select fds left: read=%d, error=%d", readFds.size(), errorFds.size());

	return readFds.size() > 0 || errorFds.size() > 0;
}

SocketSelectCancellerWin32::SocketSelectCancellerWin32()
{
	canceled = false;
}

SocketSelectCancellerWin32::~SocketSelectCancellerWin32()
{
}

void SocketSelectCancellerWin32::CancelSelect()
{
	canceled = true;
}

int NetworkSocketWinsock::GetDescriptorFromSocket(NetworkSocket *socket)
{
	NetworkSocketWinsock *sp = dynamic_cast<NetworkSocketWinsock *>(socket);
	if (sp)
		return sp->fd;
	NetworkSocketWrapper *sw = dynamic_cast<NetworkSocketWrapper *>(socket);
	if (sw)
		return GetDescriptorFromSocket(sw->GetWrapped());
	return 0;
}

inline int NetworkSocketWinsock::GetDescriptorFromSocket(const std::unique_ptr<NetworkSocket> &socket)
{
	return GetDescriptorFromSocket(socket.get());
}