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Java example source code file (Test.java)

This example Java source code file (Test.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

datagrampacket, datagramsocket, enumeration, exception, hello, inet6address, inetaddress, ioexception, multicastsocket, net, network, networkinterface, sockettimeoutexception, test, util

The Test.java Java example source code

/*
 * Copyright (c) 2001, 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 4488458
 * @summary IPv4 and IPv6 multicasting broken on Linux
 */
import java.net.*;
import java.io.IOException;
import java.util.Enumeration;

public class Test {

    static int count = 0;
    static int failures = 0;

    void doTest(String address) throws Exception {
        boolean failed = false;

        InetAddress ia = InetAddress.getByName(address);

        count++;
        System.out.println("**********************");
        System.out.println("Test " + count + ": " + ia);

        MulticastSocket mc = new MulticastSocket();
        int port = mc.getLocalPort();
        DatagramSocket s1 = new DatagramSocket();

        byte msg[] = "Hello".getBytes();
        DatagramPacket p = new DatagramPacket(msg, msg.length);

        mc.setSoTimeout(2000);

        try {
            for (int i=0; i<2; i++) {

                System.out.println("Join: " + ia);
                mc.joinGroup(ia);

                /* packets should be received */

                for (int j=0; j<2; j++) {
                    p.setAddress(ia);
                    p.setPort(port);

                    System.out.println("Send packet to: " + ia);
                    s1.send(p);

                    try {
                        mc.receive(p);
                        System.out.println("Got packet! - Good.");
                    } catch (SocketTimeoutException e) {
                        failed = true;
                        System.out.println("Failed: No packet received within timeout!!!");
                    }
                }

                System.out.println("Leave: " + ia);
                mc.leaveGroup(ia);

                /*
                 * If there are multiple interface we might be a couple of
                 * copies still in our queue
                 */
                try {
                    while (true) {
                        mc.receive(p);
                    }
                } catch (SocketTimeoutException e) { }

                /* packets should not be received */

                p.setAddress(ia);
                p.setPort(port);

                s1.send(p);

                try {
                    mc.receive(p);
                    System.out.println("Failed: Got packet after leaving group!!!");
                    failed = true;
                } catch (SocketTimeoutException e) {
                    System.out.println("No packet received within timeout! - Good.");
                }
            }

         } catch (IOException ioe) {
            System.out.println("Failed: Unexpected exception thrown: ");
            ioe.printStackTrace();
            failed = true;
        }

        mc.close();
        s1.close();

        if (failed) {
            failures++;
            System.out.println("Test failed!!");
        } else {
            System.out.println("Test passed.");
        }
    }

    void allTests() throws Exception {

        /*
         * Assume machine has IPv4 address
         */
        doTest("224.80.80.80");

        /*
         * Check if IPv6 is enabled and the scope of the addresses
         */
        boolean has_ipv6 = false;
        boolean has_siteaddress = false;
        boolean has_linklocaladdress = false;
        boolean has_globaladdress = false;

        Enumeration nifs = NetworkInterface.getNetworkInterfaces();
        while (nifs.hasMoreElements()) {
            NetworkInterface ni = (NetworkInterface)nifs.nextElement();
            Enumeration addrs = ni.getInetAddresses();

            while (addrs.hasMoreElements()) {
                InetAddress ia = (InetAddress)addrs.nextElement();

                if (ia instanceof Inet6Address) {
                    has_ipv6 = true;
                    if (ia.isLinkLocalAddress()) has_linklocaladdress = true;
                    if (ia.isSiteLocalAddress()) has_siteaddress = true;

                    if (!ia.isLinkLocalAddress() &&
                        !ia.isSiteLocalAddress() &&
                        !ia.isLoopbackAddress()) {
                        has_globaladdress = true;
                    }
                }
            }
        }

        /*
         * If IPv6 is enabled perform multicast tests with various scopes
         */
        if (has_ipv6) {
            doTest("ff01::a");
        }

        if (has_linklocaladdress) {
            doTest("ff02::a");
        }

        if (has_siteaddress) {
            doTest("ff05::a");
        }

        if (has_globaladdress) {
            doTest("ff0e::a");
        }
    }

    public static void main(String args[]) throws Exception {
        Test t = new Test();

        if (args.length == 0) {
            t.allTests();
        } else {
            for (int i=0; i<args.length; i++) {
                t.doTest(args[i]);
            }
        }

        System.out.println("**********************");
        System.out.println(count + " test(s) executed. " + failures +
                           " test(s) failed.");

        if (failures > 0) {
            throw new Exception("Test failed - see log file for details");
        }
    }
}

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