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/*
* Copyright (c) 2007, 2016, 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 4742177
* @summary Re-test IPv6 (and specifically MulticastSocket) with latest Linux & USAGI code
*/
import java.util.*;
import java.net.*;
public class NoLoopbackPackets {
private static String osname;
static boolean isWindows() {
if (osname == null)
osname = System.getProperty("os.name");
return osname.contains("Windows");
}
private static boolean hasIPv6() throws Exception {
List<NetworkInterface> nics = Collections.list(
NetworkInterface.getNetworkInterfaces());
for (NetworkInterface nic : nics) {
if (!nic.isLoopback()) {
List<InetAddress> addrs = Collections.list(nic.getInetAddresses());
for (InetAddress addr : addrs) {
if (addr instanceof Inet6Address) {
return true;
}
}
}
}
return false;
}
public static void main(String[] args) throws Exception {
if (isWindows()) {
System.out.println("The test only run on non-Windows OS. Bye.");
return;
}
if (!hasIPv6()) {
System.out.println("No IPv6 available. Bye.");
return;
}
MulticastSocket msock = null;
List<SocketAddress> failedGroups = new ArrayList<SocketAddress>();
Sender sender = null;
try {
msock = new MulticastSocket();
int port = msock.getLocalPort();
// we will send packets to three multicast groups :-
// 224.1.1.1, ::ffff:224.1.1.2, and ff02::1:1
//
List<SocketAddress> groups = new ArrayList<SocketAddress>();
groups.add(new InetSocketAddress(InetAddress.getByName("224.1.1.1"), port));
groups.add(new InetSocketAddress(InetAddress.getByName("::ffff:224.1.1.2"), port));
groups.add(new InetSocketAddress(InetAddress.getByName("ff02::1:1"), port));
sender = new Sender(groups);
new Thread(sender).start();
// Now try to receive multicast packets. we should not see any of them
// since we disable loopback mode.
//
msock.setSoTimeout(5000); // 5 seconds
byte[] buf = new byte[1024];
DatagramPacket packet = new DatagramPacket(buf, 0, buf.length);
for (SocketAddress group : groups) {
msock.joinGroup(group, null);
try {
msock.receive(packet);
// it is an error if we receive something
failedGroups.add(group);
} catch (SocketTimeoutException e) {
// we expect this
}
msock.leaveGroup(group, null);
}
} finally {
if (msock != null) try { msock.close(); } catch (Exception e) {}
if (sender != null) {
sender.stop();
}
}
if (failedGroups.size() > 0) {
System.out.println("We should not receive anything from following groups, but we did:");
for (SocketAddress group : failedGroups)
System.out.println(group);
throw new RuntimeException("test failed.");
}
}
static class Sender implements Runnable {
private List<SocketAddress> sendToGroups;
private volatile boolean stop;
public Sender(List<SocketAddress> groups) {
sendToGroups = groups;
}
public void run() {
byte[] buf = "hello world".getBytes();
List<DatagramPacket> packets = new ArrayList<DatagramPacket>();
try {
for (SocketAddress group : sendToGroups) {
DatagramPacket packet = new DatagramPacket(buf, buf.length, group);
packets.add(packet);
}
MulticastSocket msock = new MulticastSocket();
msock.setLoopbackMode(true); // disable loopback mode
while (!stop) {
for (DatagramPacket packet : packets) {
msock.send(packet);
}
Thread.sleep(1000); // 1 second
}
} catch (Exception e) {
throw new RuntimeException(e);
}
}
void stop() {
stop = true;
}
}
}
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