1 /*
   2  * Copyright (c) 2013, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23 
  24 /* @test
  25  * @bug 8014377
  26  * @summary Test for interference when two sockets are bound to the same
  27  *   port but joined to different multicast groups
  28  * @library /test/lib
  29  * @build Promiscuous
  30  * @run main Promiscuous
  31  * @run main/othervm -Djava.net.preferIPv4Stack=true Promiscuous
  32  * @key randomness
  33  */
  34 
  35 import java.nio.ByteBuffer;
  36 import java.nio.channels.*;
  37 import java.net.*;
  38 import static java.net.StandardProtocolFamily.*;
  39 import java.util.*;
  40 import java.io.IOException;
  41 import java.util.stream.Collectors;
  42 
  43 import jdk.test.lib.NetworkConfiguration;
  44 
  45 public class Promiscuous {
  46 
  47     static final Random rand = new Random();
  48 
  49     static final ProtocolFamily UNSPEC = new ProtocolFamily() {
  50         public String name() {
  51             return "UNSPEC";
  52         }
  53     };
  54 
  55     /**
  56      * Sends a datagram to the given multicast group
  57      */
  58     static int sendDatagram(NetworkInterface nif,
  59                             InetAddress group,
  60                             int port)
  61         throws IOException
  62     {
  63         ProtocolFamily family = (group instanceof Inet6Address) ?
  64             StandardProtocolFamily.INET6 : StandardProtocolFamily.INET;
  65         DatagramChannel dc = DatagramChannel.open(family)
  66             .setOption(StandardSocketOptions.IP_MULTICAST_IF, nif);
  67         int id = rand.nextInt();
  68         byte[] msg = Integer.toString(id).getBytes("UTF-8");
  69         ByteBuffer buf = ByteBuffer.wrap(msg);
  70         System.out.format("Send message -> group %s (id=0x%x)\n",
  71             group.getHostAddress(), id);
  72         dc.send(buf, new InetSocketAddress(group, port));
  73         dc.close();
  74         return id;
  75     }
  76 
  77     /**
  78      * Wait (with timeout) for datagram. The {@code datagramExepcted}
  79      * parameter indicates whether a datagram is expected, and if
  80      * {@true} then {@code id} is the identifier in the payload.
  81      */
  82     static void receiveDatagram(DatagramChannel dc,
  83                                 String name,
  84                                 boolean datagramExepcted,
  85                                 int id)
  86         throws IOException
  87     {
  88         System.out.println("Checking if received by " + name);
  89 
  90         Selector sel = Selector.open();
  91         dc.configureBlocking(false);
  92         dc.register(sel, SelectionKey.OP_READ);
  93         ByteBuffer buf = ByteBuffer.allocateDirect(100);
  94 
  95         try {
  96             for (;;) {
  97                 System.out.println("Waiting to receive message");
  98                 sel.select(5*1000);
  99                 SocketAddress sa = dc.receive(buf);
 100 
 101                 // no datagram received
 102                 if (sa == null) {
 103                     if (datagramExepcted) {
 104                         throw new RuntimeException("Expected message not received");
 105                     }
 106                     System.out.println("No message received (correct)");
 107                     return;
 108                 }
 109 
 110                 // datagram received
 111 
 112                 InetAddress sender = ((InetSocketAddress)sa).getAddress();
 113                 buf.flip();
 114                 byte[] bytes = new byte[buf.remaining()];
 115                 buf.get(bytes);
 116                 String s = new String(bytes, "UTF-8");
 117                 int receivedId = -1;
 118                 try {
 119                     receivedId = Integer.parseInt(s);
 120                     System.out.format("Received message from %s (id=0x%x)\n",
 121                             sender, receivedId);
 122                 } catch (NumberFormatException x) {
 123                     System.out.format("Received message from %s (msg=%s)\n", sender, s);
 124                 }
 125 
 126                 if (!datagramExepcted) {
 127                     if (receivedId == id)
 128                         throw new RuntimeException("Message not expected");
 129                     System.out.println("Message ignored (has wrong id)");
 130                 } else {
 131                     if (receivedId == id) {
 132                         System.out.println("Message expected");
 133                         return;
 134                     }
 135                     System.out.println("Message ignored (wrong sender)");
 136                 }
 137 
 138                 sel.selectedKeys().clear();
 139                 buf.rewind();
 140             }
 141         } finally {
 142             sel.close();
 143         }
 144     }
 145 
 146     static void test(ProtocolFamily family,
 147                      NetworkInterface nif,
 148                      InetAddress group1,
 149                      InetAddress group2)
 150         throws IOException
 151     {
 152 
 153         System.out.format("%nTest family=%s%n", family.name());
 154 
 155         DatagramChannel dc1 = (family == UNSPEC) ?
 156             DatagramChannel.open() : DatagramChannel.open(family);
 157         DatagramChannel dc2 = (family == UNSPEC) ?
 158             DatagramChannel.open() : DatagramChannel.open(family);
 159 
 160         try {
 161             dc1.setOption(StandardSocketOptions.SO_REUSEADDR, true);
 162             dc2.setOption(StandardSocketOptions.SO_REUSEADDR, true);
 163 
 164             dc1.bind(new InetSocketAddress(0));
 165             int port = dc1.socket().getLocalPort();
 166             dc2.bind(new InetSocketAddress(port));
 167 
 168             System.out.format("dc1 joining [%s]:%d @ %s\n",
 169                 group1.getHostAddress(), port, nif.getName());
 170             System.out.format("dc2 joining [%s]:%d @ %s\n",
 171                 group2.getHostAddress(), port, nif.getName());
 172 
 173             dc1.join(group1, nif);
 174             dc2.join(group2, nif);
 175 
 176             int id = sendDatagram(nif, group1, port);
 177 
 178             receiveDatagram(dc1, "dc1", true, id);
 179             receiveDatagram(dc2, "dc2", false, id);
 180 
 181             id = sendDatagram(nif, group2, port);
 182 
 183             receiveDatagram(dc1, "dc1", false, id);
 184             receiveDatagram(dc2, "dc2", true, id);
 185 
 186         } finally {
 187             dc1.close();
 188             dc2.close();
 189         }
 190     }
 191 
 192     public static void main(String[] args) throws IOException {
 193         String os = System.getProperty("os.name");
 194 
 195         // Requires IP_MULTICAST_ALL on Linux (new since 2.6.31) so skip
 196         // on older kernels. Note that we skip on <= version 3 to keep the
 197         // parsing simple
 198         if (os.equals("Linux")) {
 199             String osversion = System.getProperty("os.version");
 200             String[] vers = osversion.split("\\.", 0);
 201             int major = Integer.parseInt(vers[0]);
 202             if (major < 3) {
 203                 System.out.format("Kernel version is %s, test skipped%n", osversion);
 204                 return;
 205             }
 206         }
 207 
 208         // get local network configuration to use
 209         NetworkConfiguration config = NetworkConfiguration.probe();
 210 
 211         // multicast groups used for the test
 212         InetAddress ip4Group1 = InetAddress.getByName("225.4.5.6");
 213         InetAddress ip4Group2 = InetAddress.getByName("225.4.6.6");
 214 
 215         for (NetworkInterface nif: config.ip4MulticastInterfaces()
 216                                          .collect(Collectors.toList())) {
 217             InetAddress source = config.ip4Addresses(nif).iterator().next();
 218             test(INET, nif, ip4Group1, ip4Group2);
 219 
 220             // Solaris and Linux allow IPv6 sockets join IPv4 multicast groups
 221             if (os.equals("SunOS") || os.equals("Linux"))
 222                 test(UNSPEC, nif, ip4Group1, ip4Group2);
 223         }
 224     }
 225 }