address comments

xds/src/main/java/io/grpc/xds/XdsListenerResource.java

@@ -165,6 +165,12 @@
     if (proto.getAddress().hasSocketAddress()) {
       SocketAddress socketAddress = proto.getAddress().getSocketAddress();
       address = socketAddress.getAddress();
+      if (address.trim().isEmpty()) {
+        throw new ResourceInvalidException("Invalid address: Empty address is not allowed.");
+      }
+      if (socketAddress.hasNamedPort()) {
+        throw new ResourceInvalidException("NAMED_PORT is not supported in gRPC.");
+      }
       switch (socketAddress.getPortSpecifierCase()) {
         case NAMED_PORT:
           address = address + ":" + socketAddress.getNamedPort();

xds/src/main/java/io/grpc/xds/XdsServerWrapper.java

@@ -387,12 +387,21 @@
       }
       logger.log(Level.FINEST, "Received Lds update {0}", update);
       if (update.listener() == null) {
         onResourceDoesNotExist("Non-API");
         return;
       }
 
+      boolean isUdpListener = false;
+      for (FilterChain filterChain : update.listener().filterChains()) {
+        String transportProtocol = filterChain.filterChainMatch().transportProtocol();
+        if (transportProtocol != null && !"raw_buffer".equals(transportProtocol)) {
+          isUdpListener = true;
+          break;
+        }
+      }
+
       String ldsAddress = update.listener().address();
-      if (ldsAddress != null && !ipAddressesMatch(ldsAddress)) {
+      if (!isUdpListener && ldsAddress != null && !ipAddressesMatch(ldsAddress)) {
         handleConfigNotFoundOrMismatch(
             Status.UNKNOWN.withDescription(
                 String.format(
@@ -454,9 +463,9 @@
 
       InetAddress listenerIp = InetAddresses.forString(listenerAddressHnP.getHost());
       InetAddress ldsIp = InetAddresses.forString(ldsAddressHnP.getHost());
-      if (ldsAddressHnP.hasPort() && listenerAddressHnP.hasPort()
-          && ldsAddressHnP.getPort() != listenerAddressHnP.getPort()) {
+      if (!ldsAddressHnP.hasPort() || !listenerAddressHnP.hasPort()
+          || ldsAddressHnP.getPort() != listenerAddressHnP.getPort()) {
         return false;
       }
 
       return listenerIp.equals(ldsIp);

xds/src/test/java/io/grpc/xds/XdsServerWrapperTest.java

@@ -1862,7 +1862,7 @@ private static FilterChainMatch createMatch() {
         EnvoyServerProtoData.ConnectionSourceType.ANY,
         ImmutableList.of(),
         ImmutableList.of(),
-        "");
+        "raw_buffer");
   }
 
   private static FilterChainMatch createMatchSrcIp(String srcCidr) {