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/*
* Copyright (c) 2007, 2019, 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
* @library /test/lib
* @summary Re-test IPv6 (and specifically MulticastSocket) with latest Linux & USAGI code
*/
import java.util.*;
import java.net.*;
import jdk.test.lib.NetworkConfiguration;
import jdk.test.lib.net.IPSupport;
public class NoLoopbackPackets {
private static String osname;
static boolean isWindows() {
if (osname == null)
osname = System.getProperty("os.name");
return osname.contains("Windows");
}
private static final String MESSAGE = "hello world (" + System.nanoTime() + ")";
public static void main(String[] args) throws Exception {
if (isWindows()) {
System.out.println("The test only run on non-Windows OS. Bye.");
return;
}
MulticastSocket msock = null;
List<SocketAddress> failedGroups = new ArrayList<SocketAddress>();
Sender sender = null;
Thread senderThread = 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>();
if (IPSupport.hasIPv4()) {
groups.add(new InetSocketAddress(InetAddress.getByName("224.1.1.1"), port));
}
NetworkConfiguration nc = NetworkConfiguration.probe();
if (IPSupport.hasIPv6() && nc.hasTestableIPv6Address()) {
groups.add(new InetSocketAddress(InetAddress.getByName("::ffff:224.1.1.2"), port));
groups.add(new InetSocketAddress(InetAddress.getByName("ff02::1:1"), port));
}
if (groups.isEmpty()) {
System.err.println("Nothing to test: there are no network interfaces");
}
sender = new Sender(groups);
senderThread = new Thread(sender);
senderThread.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];
for (int i = 0; i < buf.length; i++) {
buf[i] = (byte) 'z';
}
DatagramPacket packet = new DatagramPacket(buf, 0, buf.length);
byte[] expected = MESSAGE.getBytes();
assert expected.length <= buf.length;
for (SocketAddress group : groups) {
System.out.println("joining group: " + group);
msock.joinGroup(group, null);
try {
do {
for (int i = 0; i < buf.length; i++) {
buf[i] = (byte) 'a';
}
msock.receive(packet);
byte[] data = packet.getData();
int len = packet.getLength();
if (expected(data, len, expected)) {
failedGroups.add(group);
break;
} else {
System.err.println("WARNING: Unexpected packet received from "
+ group + ": "
+ len + " bytes");
System.err.println("\t as text: " + new String(data, 0, len));
}
} while (true);
} catch (SocketTimeoutException e) {
// we expect this
System.out.println("Received expected exception from " + group + ": " + e);
} finally {
msock.leaveGroup(group, null);
}
}
} finally {
if (msock != null) try { msock.close(); } catch (Exception e) {}
if (sender != null) {
sender.stop();
}
}
try {
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.");
}
} finally {
if (senderThread != null) {
senderThread.join();
}
}
}
static boolean expected(byte[] data, int len, byte[] expected) {
if (len != expected.length) return false;
for (int i = 0; i < len; i++) {
if (data[i] != expected[i]) return false;
}
return true;
}
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 = MESSAGE.getBytes();
List<DatagramPacket> packets = new ArrayList<DatagramPacket>();
try (MulticastSocket msock = new MulticastSocket()) {
for (SocketAddress group : sendToGroups) {
DatagramPacket packet = new DatagramPacket(buf, buf.length, group);
packets.add(packet);
}
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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