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diff --git a/test/java/net/MulticastSocket/SetLoopbackMode.java b/test/java/net/MulticastSocket/SetLoopbackMode.java
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+++ b/test/java/net/MulticastSocket/SetLoopbackMode.java
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+/*
+ * Copyright 2001-2002 Sun Microsystems, Inc. All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/*
+ * @test
+ * @bug 4686717
+ * @summary Test MulticastSocket.setLoopbackMode
+ */
+import java.net.*;
+import java.io.IOException;
+
+public class SetLoopbackMode {
+
+ static final boolean FAILED = true;
+ static final boolean PASSED = false;
+
+ static boolean test(MulticastSocket mc, InetAddress grp) throws IOException {
+
+ boolean disabled = mc.getLoopbackMode();
+
+ if (disabled) {
+ System.out.println("Loopback mode is disabled.");
+ } else {
+ System.out.println("Loopback mode is enabled.");
+ }
+
+ byte b[] = "hello".getBytes();
+ DatagramPacket p = new DatagramPacket(b, b.length, grp,
+ mc.getLocalPort());
+ mc.send(p);
+
+ boolean gotPacket = false;
+
+ mc.setSoTimeout(1000);
+ try {
+ b = new byte[16];
+ p = new DatagramPacket(b, b.length);
+ mc.receive(p);
+ gotPacket = true;
+
+ /* purge any additional copies of the packet */
+ for (;;) {
+ mc.receive(p);
+ }
+
+ } catch (SocketTimeoutException x) {
+ }
+
+ if (gotPacket && disabled) {
+ System.out.println("Packet received (unexpected as loopback is disabled)");
+ return FAILED;
+ }
+ if (!gotPacket && !disabled) {
+ System.out.println
+ ("Packet not received (packet excepted as loopback is enabled)");
+ return FAILED;
+ }
+
+ if (gotPacket && !disabled) {
+ System.out.println("Packet received - correct.");
+ } else {
+ System.out.println("Packet not received - correct.");
+ }
+
+ return PASSED;
+ }
+
+ public static void main (String args[]) throws Exception {
+ int failures = 0;
+
+ MulticastSocket mc = new MulticastSocket();
+ InetAddress grp = InetAddress.getByName("224.80.80.80");
+
+
+ /*
+ * If IPv6 is available then use IPv6 multicast group - needed
+ * to workaround Linux IPv6 bug whereby !IPV6_MULTICAST_LOOP
+ * doesn't prevent loopback of IPv4 multicast packets.
+ */
+ InetAddress lb = InetAddress.getByName("::1");
+ if (NetworkInterface.getByInetAddress(lb) != null) {
+ grp = InetAddress.getByName("ff01::1");
+ }
+
+ System.out.println("\nTest will use multicast group: " + grp);
+ mc.joinGroup(grp);
+
+ System.out.println("\n******************\n");
+
+ mc.setLoopbackMode(true);
+ if (test(mc, grp) == FAILED) failures++;
+
+ System.out.println("\n******************\n");
+
+ mc.setLoopbackMode(false);
+ if (test(mc, grp) == FAILED) failures++;
+
+ System.out.println("\n******************\n");
+
+ if (failures > 0) {
+ throw new RuntimeException("Test failed");
+ }
+ }
+}