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/*
* Copyright (c) 2001, 2021, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 4686717
* @summary Test MulticastSocket.setLoopbackMode
* @library /test/lib
* @modules java.base/java.net:+open
* @build jdk.test.lib.NetworkConfiguration
* jdk.test.lib.Platform
* @run main/othervm SetLoopbackMode
*/
import java.lang.reflect.Method;
import java.lang.reflect.UndeclaredThrowableException;
import java.net.*;
import java.io.IOException;
import jdk.test.lib.NetworkConfiguration;
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.");
}
System.out.println(mc.getLocalSocketAddress());
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;
}
private static boolean canUseIPv6(NetworkConfiguration nc) {
return nc.ip6MulticastInterfaces().toArray().length > 0;
}
public static void main (String args[]) throws Exception {
int failures = 0;
NetworkConfiguration nc = NetworkConfiguration.probe();
try (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.
*/
if (canUseIPv6(nc)) {
System.out.println("IPv6 can be used");
grp = InetAddress.getByName("ff01::1");
} else {
System.out.println("IPv6 cannot be used: using IPv4");
}
System.out.println("Default network interface: " + DefaultInterface.getDefaultName());
System.out.println("\nTest will use multicast group: " + grp);
try {
System.out.println("NetworkInterface.getByInetAddress(grp): "
+ getName(NetworkInterface.getByInetAddress(grp)));
} catch (Exception x) {
// OK
}
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");
}
}
}
static String getName(NetworkInterface nif) {
return nif == null ? null : nif.getName();
}
static class DefaultInterface {
static final Method GET_DEFAULT;
static {
try {
GET_DEFAULT = Class.forName("java.net.DefaultInterface")
.getDeclaredMethod("getDefault");
GET_DEFAULT.setAccessible(true);
} catch (Exception x) {
throw new ExceptionInInitializerError(x);
}
}
static NetworkInterface getDefault() {
try {
return (NetworkInterface) GET_DEFAULT
.invoke(null);
} catch (Exception x) {
throw new UndeclaredThrowableException(x);
}
}
static String getDefaultName() {
return getName(getDefault());
}
}
}
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