Do not create incompatible TurnPort if the server address family is known.

webrtc/p2p/client/basicportallocator.cc

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 1278 matching lines @@
   for (relay_port = config.ports.begin();
        relay_port != config.ports.end(); ++relay_port) {
     TurnPort* port = NULL;
 
     // Skip UDP connections to relay servers if it's disallowed.
     if (IsFlagSet(PORTALLOCATOR_DISABLE_UDP_RELAY) &&
         relay_port->proto == PROTO_UDP) {
       continue;
     }
 
+    // Do not create a port if the server address family is known and does
+    // not match the local IP address family.
+    int server_ip_family = relay_port->address.ipaddr().family();
+    int local_ip_family = ip_.family();
+    if (server_ip_family != AF_UNSPEC && server_ip_family != local_ip_family) {
+      LOG(LS_INFO) << "Server and local address families are not compatible. "
+                   << "Server address: "
+                   << relay_port->address.ipaddr().ToString()
+                   << " Local address: " << ip_.ToString();
+      continue;
+    }
+
+
     // Shared socket mode must be enabled only for UDP based ports. Hence
     // don't pass shared socket for ports which will create TCP sockets.
     // TODO(mallinath) - Enable shared socket mode for TURN ports. Disabled
     // due to webrtc bug https://code.google.com/p/webrtc/issues/detail?id=3537
     if (IsFlagSet(PORTALLOCATOR_ENABLE_SHARED_SOCKET) &&
         relay_port->proto == PROTO_UDP && udp_socket_) {
       port = TurnPort::Create(session_->network_thread(),
                               session_->socket_factory(),
                               network_, udp_socket_.get(),
                               session_->username(), session_->password(),
@@ skipping 138 matching lines @@
   ServerAddresses servers;
   for (size_t i = 0; i < relays.size(); ++i) {
     if (relays[i].type == turn_type && SupportsProtocol(relays[i], type)) {
       servers.insert(relays[i].ports.front().address);
     }
   }
   return servers;
 }
 
 }  // namespace cricket