1 /*
2 * Copyright (c) 2013, 2020, 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 8241786
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 jdk.test.lib.NetworkConfiguration
30 * jdk.test.lib.Platform
31 * Promiscuous
32 * @run main Promiscuous
33 * @run main/othervm -Djava.net.preferIPv4Stack=true Promiscuous
34 * @key randomness
35 */
36
37 import java.nio.ByteBuffer;
38 import java.nio.channels.*;
39 import java.net.*;
40 import static java.net.StandardProtocolFamily.*;
41 import java.util.*;
42 import java.io.IOException;
43 import java.util.stream.Collectors;
44
45 import jdk.test.lib.NetworkConfiguration;
46 import jdk.test.lib.net.IPSupport;
47
48 public class Promiscuous {
49
50 static final Random rand = new Random();
51
52 static final ProtocolFamily UNSPEC = new ProtocolFamily() {
53 public String name() {
54 return "UNSPEC";
55 }
56 };
57
58 /**
59 * Sends a datagram to the given multicast group
60 */
61 static int sendDatagram(NetworkInterface nif,
62 InetAddress group,
63 int port)
64 throws IOException
65 {
66 ProtocolFamily family = (group instanceof Inet6Address) ?
67 StandardProtocolFamily.INET6 : StandardProtocolFamily.INET;
68 int id = rand.nextInt();
69 try (DatagramChannel dc = DatagramChannel.open(family)) {
70 dc.setOption(StandardSocketOptions.IP_MULTICAST_IF, nif);
71 byte[] msg = Integer.toString(id).getBytes("UTF-8");
72 ByteBuffer buf = ByteBuffer.wrap(msg);
73 System.out.format("Send message -> group %s (id=0x%x)\n",
74 group.getHostAddress(), id);
75 dc.send(buf, new InetSocketAddress(group, port));
76 }
77 return id;
78 }
79
80 /**
81 * Wait (with timeout) for datagram. The {@code datagramExepcted}
82 * parameter indicates whether a datagram is expected, and if
83 * {@true} then {@code id} is the identifier in the payload.
84 */
85 static void receiveDatagram(DatagramChannel dc,
86 String name,
87 boolean datagramExepcted,
88 int id)
89 throws IOException
90 {
91 System.out.println("Checking if received by " + name);
92
93 Selector sel = Selector.open();
94 dc.configureBlocking(false);
95 dc.register(sel, SelectionKey.OP_READ);
96 ByteBuffer buf = ByteBuffer.allocateDirect(100);
97
98 try {
99 for (;;) {
100 System.out.println("Waiting to receive message");
101 sel.select(5*1000);
102 SocketAddress sa = dc.receive(buf);
103
104 // no datagram received
105 if (sa == null) {
106 if (datagramExepcted) {
107 throw new RuntimeException("Expected message not received");
108 }
109 System.out.println("No message received (correct)");
110 return;
111 }
112
113 // datagram received
114
115 InetAddress sender = ((InetSocketAddress)sa).getAddress();
116 buf.flip();
117 byte[] bytes = new byte[buf.remaining()];
118 buf.get(bytes);
119 String s = new String(bytes, "UTF-8");
120 int receivedId = -1;
121 try {
122 receivedId = Integer.parseInt(s);
123 System.out.format("Received message from %s (id=0x%x)\n",
124 sender, receivedId);
125 } catch (NumberFormatException x) {
126 System.out.format("Received message from %s (msg=%s)\n", sender, s);
127 }
128
129 if (!datagramExepcted) {
130 if (receivedId == id)
131 throw new RuntimeException("Message not expected");
132 System.out.println("Message ignored (has wrong id)");
133 } else {
134 if (receivedId == id) {
135 System.out.println("Message expected");
136 return;
137 }
138 System.out.println("Message ignored (wrong sender)");
139 }
140
141 sel.selectedKeys().clear();
142 buf.rewind();
143 }
144 } finally {
145 sel.close();
146 }
147 }
148
149 static void test(ProtocolFamily family,
150 NetworkInterface nif,
151 InetAddress group1,
152 InetAddress group2)
153 throws IOException
154 {
155
156 System.out.format("%nTest family=%s%n", family.name());
157
158 DatagramChannel dc1 = (family == UNSPEC) ?
159 DatagramChannel.open() : DatagramChannel.open(family);
160 DatagramChannel dc2 = (family == UNSPEC) ?
161 DatagramChannel.open() : DatagramChannel.open(family);
162
163 try {
164 dc1.setOption(StandardSocketOptions.SO_REUSEADDR, true);
165 dc2.setOption(StandardSocketOptions.SO_REUSEADDR, true);
166
167 dc1.bind(new InetSocketAddress(0));
168 int port = dc1.socket().getLocalPort();
169 dc2.bind(new InetSocketAddress(port));
170
171 System.out.format("dc1 joining [%s]:%d @ %s\n",
172 group1.getHostAddress(), port, nif.getName());
173 System.out.format("dc2 joining [%s]:%d @ %s\n",
174 group2.getHostAddress(), port, nif.getName());
175
176 dc1.join(group1, nif);
177 dc2.join(group2, nif);
178
179 int id = sendDatagram(nif, group1, port);
180
181 receiveDatagram(dc1, "dc1", true, id);
182 receiveDatagram(dc2, "dc2", false, id);
183
184 id = sendDatagram(nif, group2, port);
185
186 receiveDatagram(dc1, "dc1", false, id);
187 receiveDatagram(dc2, "dc2", true, id);
188
189 } finally {
190 dc1.close();
191 dc2.close();
192 }
193 }
194
195 public static void main(String[] args) throws IOException {
196 IPSupport.throwSkippedExceptionIfNonOperational();
197
198 String os = System.getProperty("os.name");
199
200 // Requires IP_MULTICAST_ALL on Linux (new since 2.6.31) so skip
201 // on older kernels. Note that we skip on <= version 3 to keep the
202 // parsing simple
203 if (os.equals("Linux")) {
204 String osversion = System.getProperty("os.version");
205 String[] vers = osversion.split("\\.", 0);
206 int major = Integer.parseInt(vers[0]);
207 if (major < 3) {
208 System.out.format("Kernel version is %s, test skipped%n", osversion);
209 return;
210 }
211 }
212
213 // get local network configuration to use
214 NetworkConfiguration config = NetworkConfiguration.probe();
215
216 // multicast groups used for the test
217 InetAddress ip4Group1 = InetAddress.getByName("225.4.5.6");
218 InetAddress ip4Group2 = InetAddress.getByName("225.4.6.6");
219
220 for (NetworkInterface nif: config.ip4MulticastInterfaces()
221 .collect(Collectors.toList())) {
222 InetAddress source = config.ip4Addresses(nif).iterator().next();
223 test(INET, nif, ip4Group1, ip4Group2);
224
225 // Solaris and Linux allow IPv6 sockets join IPv4 multicast groups
226 if (os.equals("Linux"))
227 test(UNSPEC, nif, ip4Group1, ip4Group2);
228 }
229 }
230 }