Fix most UDP issues on Mac OS

runtime/bin/socket_patch.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 patch class RawServerSocket {
   /* patch */ static Future<RawServerSocket> bind(address,
                                                   int port,
                                                   {int backlog: 0,
                                                    bool v6Only: false}) {
     return _RawServerSocket.bind(address, port, backlog, v6Only);
@@ skipping 755 matching lines @@
     if (result is OSError) throw result;
   }
 
   InternetAddress multicastAddress(
       InternetAddress addr, NetworkInterface interface) {
     // On Mac OS using the interface index for joining IPv4 multicast groups
     // is not supported. Here the IP address of the interface is needed.
     if (Platform.isMacOS && addr.type == InternetAddressType.IP_V4) {
       if (interface != null) {
         for (int i = 0; i < interface.addresses.length; i++) {
-          if (addr.type == InternetAddressType.IP_V4) {
+          if (interface.addresses[i].type == InternetAddressType.IP_V4) {
             return interface.addresses[i];
           }
         }
         // No IPv4 address found on the interface.
         throw new SocketException(
             "The network interface does not have an address "
             "of the same family as the multicast address");
       } else {
-        // Default to the ANY address if on iterface is specified.
+        // Default to the ANY address if no iterface is specified.
         return InternetAddress.ANY_IP_V4;
       }
     } else {
       return null;
     }
   }
 
   void joinMulticast(InternetAddress addr, NetworkInterface interface) {
     var interfaceAddr = multicastAddress(addr, interface);
     var interfaceIndex = interface == null ? 0 : interface.index;
@@ skipping 749 matching lines @@
 
 Datagram _makeDatagram(List<int> data,
                        String address,
                        List<int> in_addr,
                        int port) {
   return new Datagram(
       data,
       new _InternetAddress(address, null, in_addr),
       port);
 }