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