Use GetBestInterfaceEx when available.

Since GetBestInterface is not available in UWP apps. GetBestInterface: https://docs.microsoft.com/en-us/windows/win32/api/iphlpapi/nf-iphlpapi-getbestinterface#requirements GetBestInterfaceEx: https://docs.microsoft.com/en-us/windows/win32/api/iphlpapi/nf-iphlpapi-getbestinterfaceex#requirements
miniupnp · Mar 18, 2021 · 3a08dd4 · 3a08dd4
1 parent c1b6474
commit 3a08dd4
Showing 1 changed file with 10 additions and 0 deletions.
diff --git a/miniupnpc/minissdpc.c b/miniupnpc/minissdpc.c
@@ -576,7 +576,17 @@ ssdpDiscoverDevices(const char * const deviceTypes[],
  * in order to give this ip to setsockopt(sudp, IPPROTO_IP, IP_MULTICAST_IF) */
 	if(!ipv6) {
 		DWORD ifbestidx;
+#if _WIN32_WINNT >= 0x0600 // _WIN32_WINNT_VISTA
+		// While we don't need IPv6 support, the IPv4 only funciton is not available in UWP apps.
+		SOCKADDR_IN destAddr;
+		memset(&destAddr, 0, sizeof(destAddr));
+		destAddr.sin_family = AF_INET;
+		destAddr.sin_addr.s_addr = inet_addr("223.255.255.255");
+		destAddr.sin_port = 0;
+		if (GetBestInterfaceEx((struct sockaddr *)&destAddr, &ifbestidx) == NO_ERROR) {
+#else
 		if (GetBestInterface(inet_addr("223.255.255.255"), &ifbestidx) == NO_ERROR) {
+#endif
 			DWORD dwRetVal = NO_ERROR;
 			PIP_ADAPTER_ADDRESSES pAddresses = NULL;
 			ULONG outBufLen = 15360;