/*

 * Copyright (c) 2013, 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.

 *

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 * questions.

 *

/* @test

 * @bug 8014499

 * @summary Test for interference when two sockets are bound to the same

 *          port but joined to different multicast groups

 * @run main Promiscuous

 * @run main/othervm -Djava.net.preferIPv4Stack=true Promiscuous

 */

import java.io.IOException;

import static java.lang.System.out;

import java.net.*;

public class Promiscuous {

    static final int TIMEOUT =  5 * 1000; // 5 secs

    static int id = 1000;

    static void receive(MulticastSocket mc, boolean datagramExpected, int id)

        throws IOException

    {

        byte[] ba = new byte[100];

        DatagramPacket p = new DatagramPacket(ba, ba.length);

        try {

            mc.receive(p);

            int recvId = Integer.parseInt(

                    new String(p.getData(), 0, p.getLength(), "UTF-8"));

            if (datagramExpected) {

                if (recvId != id)

                    throw new RuntimeException("Unexpected id, got " + recvId

                                               + ", expected: " + id);

                out.printf("Received message as expected, %s\n", p.getAddress());

            } else {

                throw new RuntimeException("Unexpected message received, "

                                           + p.getAddress());

            }

        } catch (SocketTimeoutException e) {

            if (datagramExpected)

                throw new RuntimeException("Expected message not received, "

                                            + e.getMessage());

            else

                out.printf("Message not received, as expected\n");

        }

    }

    static void test(InetAddress group1, InetAddress group2)

        throws IOException

    {

        try (MulticastSocket mc1 = new MulticastSocket();

             MulticastSocket mc2 = new MulticastSocket(mc1.getLocalPort());

             DatagramSocket ds = new DatagramSocket()) {

            final int port = mc1.getLocalPort();

            out.printf("Using port: %d\n", port);

            mc1.setSoTimeout(TIMEOUT);

            mc2.setSoTimeout(TIMEOUT);

            int nextId = id;

            byte[] msg = Integer.toString(nextId).getBytes("UTF-8");

            DatagramPacket p = new DatagramPacket(msg, msg.length);

            p.setAddress(group1);

            p.setPort(port);

            mc1.joinGroup(group1);

            out.printf("mc1 joined the MC group: %s\n", group1);

            mc2.joinGroup(group2);

            out.printf("mc2 joined the MC group: %s\n", group2);

            out.printf("Sending datagram to: %s/%d\n", group1, port);

            ds.send(p);

            // the packet should be received by mc1 only

            receive(mc1, true, nextId);

            receive(mc2, false, 0);

            nextId = ++id;

            msg = Integer.toString(nextId).getBytes("UTF-8");

            p = new DatagramPacket(msg, msg.length);

            p.setAddress(group2);

            p.setPort(port);

            out.printf("Sending datagram to: %s/%d\n", group2, port);

            ds.send(p);

            // the packet should be received by mc2 only

            receive(mc2, true, nextId);

            receive(mc1, false, 0);

            mc1.leaveGroup(group1);

            mc2.leaveGroup(group2);

        }

    }

    public static void main(String args[]) throws IOException {

        String os = System.getProperty("os.name");

        // Requires IP_MULTICAST_ALL on Linux (new since 2.6.31) so skip

        // on older kernels. Note that we skip on <= version 3 to keep the

        // parsing simple

        if (os.equals("Linux")) {

            String osversion = System.getProperty("os.version");

            String[] vers = osversion.split("\\.", 0);

            int major = Integer.parseInt(vers[0]);

            if (major < 3) {

                System.out.format("Kernel version is %s, test skipped%n", osversion);

                return;

            }

        }

        // multicast groups used for the test

        InetAddress ip4Group1 = InetAddress.getByName("224.7.8.9");

        InetAddress ip4Group2 = InetAddress.getByName("225.4.5.6");

        test(ip4Group1, ip4Group2);

    }

}