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 * @build Promiscuous NetworkConfiguration
29 * @run main Promiscuous
30 * @run main/othervm -Djava.net.preferIPv4Stack=true Promiscuous
31 * @key randomness
32 */
33
34 import java.nio.ByteBuffer;
35 import java.nio.channels.*;
36 import java.net.*;
37 import static java.net.StandardProtocolFamily.*;
38 import java.util.*;
39 import java.io.IOException;
40
41 public class Promiscuous {
42
43 static final Random rand = new Random();
44
45 static final ProtocolFamily UNSPEC = new ProtocolFamily() {
46 public String name() {
47 return "UNSPEC";
48 }
49 };
50
51 /**
52 * Sends a datagram to the given multicast group
53 */
54 static int sendDatagram(NetworkInterface nif,
55 InetAddress group,
56 int port)
57 throws IOException
58 {
59 ProtocolFamily family = (group instanceof Inet6Address) ?
60 StandardProtocolFamily.INET6 : StandardProtocolFamily.INET;
61 DatagramChannel dc = DatagramChannel.open(family)
62 .setOption(StandardSocketOptions.IP_MULTICAST_IF, nif);
63 int id = rand.nextInt();
64 byte[] msg = Integer.toString(id).getBytes("UTF-8");
65 ByteBuffer buf = ByteBuffer.wrap(msg);
66 System.out.format("Send message -> group %s (id=0x%x)\n",
67 group.getHostAddress(), id);
68 dc.send(buf, new InetSocketAddress(group, port));
69 dc.close();
70 return id;
71 }
72
73 /**
74 * Wait (with timeout) for datagram. The {@code datagramExepcted}
75 * parameter indicates whether a datagram is expected, and if
76 * {@true} then {@code id} is the identifier in the payload.
77 */
78 static void receiveDatagram(DatagramChannel dc,
79 String name,
80 boolean datagramExepcted,
81 int id)
82 throws IOException
83 {
84 System.out.println("Checking if received by " + name);
85
86 Selector sel = Selector.open();
87 dc.configureBlocking(false);
88 dc.register(sel, SelectionKey.OP_READ);
89 ByteBuffer buf = ByteBuffer.allocateDirect(100);
90
91 try {
92 for (;;) {
93 System.out.println("Waiting to receive message");
94 sel.select(5*1000);
95 SocketAddress sa = dc.receive(buf);
96
97 // no datagram received
98 if (sa == null) {
99 if (datagramExepcted) {
100 throw new RuntimeException("Expected message not recieved");
101 }
102 System.out.println("No message received (correct)");
103 return;
104 }
105
106 // datagram received
107
108 InetAddress sender = ((InetSocketAddress)sa).getAddress();
109 buf.flip();
110 byte[] bytes = new byte[buf.remaining()];
111 buf.get(bytes);
112 int receivedId = Integer.parseInt(new String(bytes));
113
114 System.out.format("Received message from %s (id=0x%x)\n",
115 sender, receivedId);
116
117 if (!datagramExepcted) {
118 if (receivedId == id)
119 throw new RuntimeException("Message not expected");
120 System.out.println("Message ignored (has wrong id)");
121 } else {
122 if (receivedId == id) {
123 System.out.println("Message expected");
124 return;
125 }
126 System.out.println("Message ignored (wrong sender)");
127 }
128
129 sel.selectedKeys().clear();
130 buf.rewind();
131 }
132 } finally {
133 sel.close();
134 }
135 }
136
137 static void test(ProtocolFamily family,
138 NetworkInterface nif,
139 InetAddress group1,
140 InetAddress group2)
141 throws IOException
142 {
143
144 System.out.format("%nTest family=%s%n", family.name());
145
146 DatagramChannel dc1 = (family == UNSPEC) ?
147 DatagramChannel.open() : DatagramChannel.open(family);
148 DatagramChannel dc2 = (family == UNSPEC) ?
149 DatagramChannel.open() : DatagramChannel.open(family);
150
151 try {
152 dc1.setOption(StandardSocketOptions.SO_REUSEADDR, true);
153 dc2.setOption(StandardSocketOptions.SO_REUSEADDR, true);
154
155 dc1.bind(new InetSocketAddress(0));
156 int port = dc1.socket().getLocalPort();
157 dc2.bind(new InetSocketAddress(port));
158
159 System.out.format("dc1 joining [%s]:%d @ %s\n",
160 group1.getHostAddress(), port, nif.getName());
161 System.out.format("dc2 joining [%s]:%d @ %s\n",
162 group2.getHostAddress(), port, nif.getName());
163
164 dc1.join(group1, nif);
165 dc2.join(group2, nif);
166
167 int id = sendDatagram(nif, group1, port);
168
169 receiveDatagram(dc1, "dc1", true, id);
170 receiveDatagram(dc2, "dc2", false, id);
171
172 id = sendDatagram(nif, group2, port);
173
174 receiveDatagram(dc1, "dc1", false, id);
175 receiveDatagram(dc2, "dc2", true, id);
176
177 } finally {
178 dc1.close();
179 dc2.close();
180 }
181 }
182
183 public static void main(String[] args) throws IOException {
184 String os = System.getProperty("os.name");
185
186 // Requires IP_MULTICAST_ALL on Linux (new since 2.6.31) so skip
187 // on older kernels. Note that we skip on <= version 3 to keep the
188 // parsing simple
189 if (os.equals("Linux")) {
190 String osversion = System.getProperty("os.version");
191 String[] vers = osversion.split("\\.", 0);
192 int major = Integer.parseInt(vers[0]);
193 if (major < 3) {
194 System.out.format("Kernel version is %s, test skipped%n", osversion);
195 return;
196 }
197 }
198
199 // get local network configuration to use
200 NetworkConfiguration config = NetworkConfiguration.probe();
201
202 // multicast groups used for the test
203 InetAddress ip4Group1 = InetAddress.getByName("225.4.5.6");
204 InetAddress ip4Group2 = InetAddress.getByName("225.4.6.6");
205
206 for (NetworkInterface nif: config.ip4Interfaces()) {
207 InetAddress source = config.ip4Addresses(nif).iterator().next();
208 test(INET, nif, ip4Group1, ip4Group2);
209
210 // Solaris and Linux allow IPv6 sockets join IPv4 multicast groups
211 if (os.equals("SunOS") || os.equals("Linux"))
212 test(UNSPEC, nif, ip4Group1, ip4Group2);
213 }
214 }
215 }