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 * @run main/othervm SetLoopbackMode 30 */ 31 32 import java.net.*; 33 import java.io.IOException; 34 import java.util.Enumeration; 35 import jdk.test.lib.NetworkConfiguration; 36 37 public class SetLoopbackMode { 38 39 static final boolean FAILED = true; 40 static final boolean PASSED = false; 41 42 static boolean test(MulticastSocket mc, InetAddress grp) throws IOException { 43 44 boolean disabled = mc.getLoopbackMode(); 45 46 if (disabled) { 47 System.out.println("Loopback mode is disabled."); 48 } else { 49 System.out.println("Loopback mode is enabled."); 50 } 51 52 byte b[] = "hello".getBytes(); 53 DatagramPacket p = new DatagramPacket(b, b.length, grp, 54 mc.getLocalPort()); 55 mc.send(p); 56 57 boolean gotPacket = false; 58 59 mc.setSoTimeout(1000); 60 try { 61 b = new byte[16]; 62 p = new DatagramPacket(b, b.length); 63 mc.receive(p); 64 gotPacket = true; 65 66 /* purge any additional copies of the packet */ 67 for (;;) { 68 mc.receive(p); 69 } 70 71 } catch (SocketTimeoutException x) { 72 } 73 74 if (gotPacket && disabled) { 75 System.out.println("Packet received (unexpected as loopback is disabled)"); 76 return FAILED; 77 } 78 if (!gotPacket && !disabled) { 79 System.out.println 80 ("Packet not received (packet excepted as loopback is enabled)"); 81 return FAILED; 82 } 83 84 if (gotPacket && !disabled) { 85 System.out.println("Packet received - correct."); 86 } else { 87 System.out.println("Packet not received - correct."); 88 } 89 90 return PASSED; 91 } 92 93 private static boolean canUseIPv6(NetworkConfiguration nc) { 94 return nc.ip6MulticastInterfaces().toArray().length > 0; 95 } 96 97 public static void main (String args[]) throws Exception { 98 int failures = 0; 99 NetworkConfiguration nc = NetworkConfiguration.probe(); 100 101 MulticastSocket mc = new MulticastSocket(); 102 InetAddress grp = InetAddress.getByName("224.80.80.80"); 103 104 105 /* 106 * If IPv6 is available then use IPv6 multicast group - needed 107 * to workaround Linux IPv6 bug whereby !IPV6_MULTICAST_LOOP 108 * doesn't prevent loopback of IPv4 multicast packets. 109 */ 110 111 if (canUseIPv6(nc)) { 112 grp = InetAddress.getByName("ff01::1"); 113 } 114 115 //mc.setNetworkInterface(NetworkInterface.getByInetAddress(lb)); 116 System.out.println("\nTest will use multicast group: " + grp); 117 mc.joinGroup(grp); 118 119 System.out.println("\n******************\n"); 120 121 mc.setLoopbackMode(true); 122 if (test(mc, grp) == FAILED) failures++; 123 124 System.out.println("\n******************\n"); 125 126 mc.setLoopbackMode(false); 127 if (test(mc, grp) == FAILED) failures++; 128 129 System.out.println("\n******************\n"); 130 131 if (failures > 0) { 132 throw new RuntimeException("Test failed"); 133 } 134 } 135 }