1 /*
   2  * Copyright (c) 2001, 2002, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @bug 4686717
  27  * @summary Test MulticastSocket.setLoopbackMode
  28  * @library /test/lib
  29  * @build jdk.test.lib.NetworkConfiguration
  30  *        jdk.test.lib.Platform
  31  * @run main/othervm SetLoopbackMode
  32  */
  33 
  34 import java.net.*;
  35 import java.io.IOException;
  36 import java.util.Enumeration;
  37 import jdk.test.lib.NetworkConfiguration;
  38 
  39 public class SetLoopbackMode {
  40 
  41     static final boolean FAILED = true;
  42     static final boolean PASSED = false;
  43 
  44     static boolean test(MulticastSocket mc, InetAddress grp) throws IOException {
  45 
  46         boolean disabled = mc.getLoopbackMode();
  47 
  48         if (disabled) {
  49             System.out.println("Loopback mode is disabled.");
  50         } else {
  51             System.out.println("Loopback mode is enabled.");
  52         }
  53 
  54         byte b[] = "hello".getBytes();
  55         DatagramPacket p = new DatagramPacket(b, b.length, grp,
  56                                 mc.getLocalPort());
  57         mc.send(p);
  58 
  59         boolean gotPacket = false;
  60 
  61         mc.setSoTimeout(1000);
  62         try {
  63             b = new byte[16];
  64             p = new DatagramPacket(b, b.length);
  65             mc.receive(p);
  66             gotPacket = true;
  67 
  68             /* purge any additional copies of the packet */
  69             for (;;) {
  70                 mc.receive(p);
  71             }
  72 
  73         } catch (SocketTimeoutException x) {
  74         }
  75 
  76         if (gotPacket && disabled) {
  77             System.out.println("Packet received (unexpected as loopback is disabled)");
  78             return FAILED;
  79         }
  80         if (!gotPacket && !disabled) {
  81             System.out.println
  82                 ("Packet not received (packet excepted as loopback is enabled)");
  83             return FAILED;
  84         }
  85 
  86         if (gotPacket && !disabled) {
  87             System.out.println("Packet received - correct.");
  88         } else {
  89             System.out.println("Packet not received - correct.");
  90         }
  91 
  92         return PASSED;
  93     }
  94 
  95     private static boolean canUseIPv6(NetworkConfiguration nc) {
  96         return nc.ip6MulticastInterfaces().toArray().length > 0;
  97     }
  98 
  99     public static void main (String args[]) throws Exception {
 100         int failures = 0;
 101         NetworkConfiguration nc = NetworkConfiguration.probe();
 102 
 103         MulticastSocket mc = new MulticastSocket();
 104         InetAddress grp = InetAddress.getByName("224.80.80.80");
 105 
 106 
 107         /*
 108          * If IPv6 is available then use IPv6 multicast group - needed
 109          * to workaround Linux IPv6 bug whereby !IPV6_MULTICAST_LOOP
 110          * doesn't prevent loopback of IPv4 multicast packets.
 111          */
 112 
 113         if (canUseIPv6(nc)) {
 114             grp = InetAddress.getByName("ff01::1");
 115         }
 116 
 117         //mc.setNetworkInterface(NetworkInterface.getByInetAddress(lb));
 118         System.out.println("\nTest will use multicast group: " + grp);
 119         mc.joinGroup(grp);
 120 
 121         System.out.println("\n******************\n");
 122 
 123         mc.setLoopbackMode(true);
 124         if (test(mc, grp) == FAILED) failures++;
 125 
 126         System.out.println("\n******************\n");
 127 
 128         mc.setLoopbackMode(false);
 129         if (test(mc, grp) == FAILED) failures++;
 130 
 131         System.out.println("\n******************\n");
 132 
 133         if (failures > 0) {
 134             throw new RuntimeException("Test failed");
 135         }
 136     }
 137 }