1 /*

     2  * Copyright 2007-2008 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  */

    23 

    24 /* @test

    25  * @bug 4527345

    26  * @summary Unit test for DatagramChannel's multicast support

    27  * @build MulticastSendReceiveTests NetworkConfiguration

    28  */

    29 

    30 import java.nio.ByteBuffer;

    31 import java.nio.channels.*;

    32 import java.net.*;

    33 import java.util.*;

    34 import java.io.IOException;

    35 

    36 public class MulticastSendReceiveTests {

    37 

    38     static Random rand = new Random();

    39 

    40     /**

    41      * Send datagram from given local address to given multicast

    42      * group.

    43      */

    44     static int sendDatagram(InetAddress local,

    45                             NetworkInterface nif,

    46                             InetAddress group,

    47                             int port)

    48         throws IOException

    49     {

    50         ProtocolFamily family = (group instanceof Inet6Address) ?

    51             StandardProtocolFamily.INET6 : StandardProtocolFamily.INET;

    52         DatagramChannel dc = DatagramChannel.open(family)

    53             .bind(new InetSocketAddress(local, 0))

    54             .setOption(StandardSocketOption.IP_MULTICAST_IF, nif);

    55         int id = rand.nextInt();

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

    57         ByteBuffer buf = ByteBuffer.wrap(msg);

    58         System.out.format("Send message from %s -> group %s (id=0x%x)\n",

    59             local.getHostAddress(), group.getHostAddress(), id);

    60         dc.send(buf, new InetSocketAddress(group, port));

    61         dc.close();

    62         return id;

    63     }

    64 

    65     /**

    66      * Wait (with timeout) for datagram.

    67      *

    68      * @param   expectedSender - expected sender address, or

    69      *                           null if no datagram expected

    70      * @param   id - expected id of datagram

    71      */

    72     static void receiveDatagram(DatagramChannel dc,

    73                                 InetAddress expectedSender,

    74                                 int id)

    75         throws IOException

    76     {

    77         Selector sel = Selector.open();

    78         dc.configureBlocking(false);

    79         dc.register(sel, SelectionKey.OP_READ);

    80         ByteBuffer buf = ByteBuffer.allocateDirect(100);

    81 

    82         try {

    83             for (;;) {

    84                 System.out.println("Waiting to receive message");

    85                 sel.select(5*1000);

    86                 SocketAddress sa = dc.receive(buf);

    87 

    88                 // no datagram received

    89                 if (sa == null) {

    90                     if (expectedSender != null) {

    91                         throw new RuntimeException("Expected message not recieved");

    92                     }

    93                     System.out.println("No message received (correct)");

    94                     return;

    95                 }

    96 

    97                 // datagram received

    98 

    99                 InetAddress sender = ((InetSocketAddress)sa).getAddress();

   100                 buf.flip();

   101                 byte[] bytes = new byte[buf.remaining()];

   102                 buf.get(bytes);

   103                 int receivedId = Integer.parseInt(new String(bytes));

   104 

   105                 System.out.format("Received message from %s (id=0x%x)\n",

   106                     sender, receivedId);

   107 

   108                 if (expectedSender == null) {

   109                     if (receivedId == id)

   110                         throw new RuntimeException("Message not expected");

   111                     System.out.println("Message ignored (has wrong id)");

   112                 } else {

   113                     if (sender.equals(expectedSender)) {

   114                         System.out.println("Message expected");

   115                         return;

   116                     }

   117                     System.out.println("Message ignored (wrong sender)");

   118                 }

   119 

   120                 sel.selectedKeys().clear();

   121                 buf.rewind();

   122             }

   123         } finally {

   124             sel.close();

   125         }

   126     }

   127 

   128 

   129     /**

   130      * Exercise multicast send/receive on given group/interface

   131      */

   132     static void test(NetworkInterface nif, InetAddress group, InetAddress source)

   133         throws IOException

   134     {

   135         ProtocolFamily family = (group instanceof Inet6Address) ?

   136             StandardProtocolFamily.INET6 : StandardProtocolFamily.INET;

   137         System.out.format("create channel to %s socket\n", family.name());

   138         DatagramChannel dc = DatagramChannel.open(family)

   139             .setOption(StandardSocketOption.SO_REUSEADDR, true)

   140             .bind(new InetSocketAddress(0));

   141 

   142         // join group

   143         System.out.format("join %s @ %s\n", group.getHostAddress(),

   144             nif.getName());

   145         MembershipKey key = dc.join(group, nif);

   146 

   147         // send message to group

   148         int port = ((InetSocketAddress)dc.getLocalAddress()).getPort();

   149         int id = sendDatagram(source, nif, group, port);

   150 

   151         // receive message and check id matches

   152         receiveDatagram(dc, source, id);

   153 

   154         // exclude-mode filtering

   155 

   156         try {

   157             System.out.format("block %s\n", source.getHostAddress());

   158 

   159             // may throw UOE

   160             key.block(source);

   161             id = sendDatagram(source, nif, group, port);

   162             receiveDatagram(dc, null, id);

   163 

   164             // unblock source, send message, message should be received

   165             System.out.format("unblock %s\n", source.getHostAddress());

   166             key.unblock(source);

   167             id = sendDatagram(source, nif, group, port);

   168             receiveDatagram(dc, source, id);

   169         } catch (UnsupportedOperationException x) {

   170             System.out.println("Exclude-mode filtering not supported!");

   171         }

   172 

   173         key.drop();

   174 

   175         // include-mode filtering

   176 

   177         InetAddress bogus = (group instanceof Inet6Address) ?

   178             InetAddress.getByName("fe80::1234") :

   179             InetAddress.getByName("1.2.3.4");

   180         System.out.format("join %s @ %s only-source %s\n", group.getHostAddress(),

   181             nif.getName(), bogus.getHostAddress());

   182         try {

   183             // may throw UOE

   184             key = dc.join(group, nif, bogus);

   185 

   186             id = sendDatagram(source, nif, group, port);

   187             receiveDatagram(dc, null, id);

   188 

   189             System.out.format("join %s @ %s only-source %s\n", group.getHostAddress(),

   190                 nif.getName(), source.getHostAddress());

   191             key = dc.join(group, nif, source);

   192 

   193             id = sendDatagram(source, nif, group, port);

   194             receiveDatagram(dc, source, id);

   195         } catch (UnsupportedOperationException x) {

   196             System.out.println("Include-mode filtering not supported!");

   197         }

   198 

   199         // done

   200         dc.close();

   201     }

   202 

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

   204         NetworkConfiguration config = NetworkConfiguration.probe();

   205 

   206         // multicast groups used for the test

   207         InetAddress ip4Group = InetAddress.getByName("225.4.5.6");

   208         InetAddress ip6Group = InetAddress.getByName("ff02::a");

   209 

   210         for (NetworkInterface nif: config.ip4Interfaces()) {

   211             InetAddress source = config.ip4Addresses(nif).iterator().next();

   212             test(nif, ip4Group, source);

   213         }

   214 

   215         for (NetworkInterface nif: config.ip6Interfaces()) {

   216             InetAddress source = config.ip6Addresses(nif).iterator().next();

   217             test(nif, ip6Group, source);

   218         }

   219     }

   220 }