Function GetLocalIPV6Address

libi2pd/util.cpp:689–767

	template<typename CheckAddress>
	static boost::asio::ip::address_v6 GetLocalIPV6Address (CheckAddress checkAddress)
	{
#if defined(_WIN32)
		ULONG outBufLen = 0;
		PIP_ADAPTER_ADDRESSES pAddresses = nullptr;
		PIP_ADAPTER_ADDRESSES pCurrAddresses = nullptr;
		PIP_ADAPTER_UNICAST_ADDRESS pUnicast = nullptr;

		if (GetAdaptersAddresses(AF_INET6, GAA_FLAG_INCLUDE_PREFIX, nullptr, pAddresses, &outBufLen)
			== ERROR_BUFFER_OVERFLOW)
		{
			FREE(pAddresses);
			pAddresses = (IP_ADAPTER_ADDRESSES*) MALLOC(outBufLen);
		}

		DWORD dwRetVal = GetAdaptersAddresses(
			AF_INET6, GAA_FLAG_INCLUDE_PREFIX, nullptr, pAddresses, &outBufLen
		);

		if (dwRetVal != NO_ERROR)
		{
			LogPrint(eLogError, "NetIface: GetYggdrasilAddress(): enclosed GetAdaptersAddresses() call has failed");
			FREE(pAddresses);
			return boost::asio::ip::address_v6 ();
		}

		pCurrAddresses = pAddresses;
		while (pCurrAddresses)
		{
			pUnicast = pCurrAddresses->FirstUnicastAddress;

			while (pUnicast != nullptr)
			{
				LPSOCKADDR lpAddr = pUnicast->Address.lpSockaddr;
				sockaddr_in6 *localInterfaceAddress = (sockaddr_in6*) lpAddr;
				if (checkAddress(localInterfaceAddress->sin6_addr.u.Byte)) {
					boost::asio::ip::address_v6::bytes_type bytes;
					memcpy (bytes.data (), &localInterfaceAddress->sin6_addr.u.Byte, 16);
					FREE(pAddresses);
					return boost::asio::ip::address_v6 (bytes);
				}
				pUnicast = pUnicast->Next;
			}
			pCurrAddresses = pCurrAddresses->Next;
		}
		LogPrint(eLogWarning, "NetIface: Interface with ipv6 network address not found");
		FREE(pAddresses);
		return boost::asio::ip::address_v6 ();
#else
		ifaddrs *addrs;
		try
		{
			if (!getifaddrs(&addrs))
			{
				for (auto cur = addrs; cur; cur = cur->ifa_next)
				{
					if (cur->ifa_addr && cur->ifa_addr->sa_family == AF_INET6)
					{