1 /*
2 * Copyright (c) 2007, 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 4527345 7026376 6633549 8233435
26 * @summary Unit test for DatagramChannel's multicast support
27 * @library /test/lib
28 * @build jdk.test.lib.NetworkConfiguration
29 * jdk.test.lib.Platform
30 * jdk.test.lib.net.IPSupport
31 * MulticastSendReceiveTests
32 * @run main MulticastSendReceiveTests
33 * @run main/othervm -Djava.net.preferIPv4Stack=true MulticastSendReceiveTests
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.Platform;
46 import jdk.test.lib.NetworkConfiguration;
47 import jdk.test.lib.net.IPSupport;
48
49 public class MulticastSendReceiveTests {
50
51 static final Random rand = new Random();
52
53 static final ProtocolFamily UNSPEC = new ProtocolFamily() {
54 public String name() {
55 return "UNSPEC";
56 }
57 };
58
59 /**
60 * Send datagram from given local address to given multicast
61 * group.
62 */
63 static int sendDatagram(InetAddress local,
64 NetworkInterface nif,
65 InetAddress group,
66 int port)
67 throws IOException
68 {
69 ProtocolFamily family = (group instanceof Inet6Address) ?
70 StandardProtocolFamily.INET6 : StandardProtocolFamily.INET;
71 int id = rand.nextInt();
72 try (DatagramChannel dc = DatagramChannel.open(family)) {
73 dc.bind(new InetSocketAddress(local, 0));
74 dc.setOption(StandardSocketOptions.IP_MULTICAST_IF, nif);
75 byte[] msg = Integer.toString(id).getBytes("UTF-8");
76 ByteBuffer buf = ByteBuffer.wrap(msg);
77 System.out.format("Send message from %s -> group %s (id=0x%x)\n",
78 local.getHostAddress(), group.getHostAddress(), id);
79 dc.send(buf, new InetSocketAddress(group, port));
80 }
81 return id;
82 }
83
84 /**
85 * Wait (with timeout) for datagram.
86 *
87 * @param expectedSender - expected sender address, or
88 * null if no datagram expected
89 * @param id - expected id of datagram
90 */
91 static void receiveDatagram(DatagramChannel dc,
92 InetAddress expectedSender,
93 int id)
94 throws IOException
95 {
96 Selector sel = Selector.open();
97 dc.configureBlocking(false);
98 dc.register(sel, SelectionKey.OP_READ);
99 ByteBuffer buf = ByteBuffer.allocateDirect(100);
100
101 try {
102 for (;;) {
103 System.out.println("Waiting to receive message");
104 sel.select(5*1000);
105 SocketAddress sa = dc.receive(buf);
106
107 // no datagram received
108 if (sa == null) {
109 if (expectedSender != null) {
110 throw new RuntimeException("Expected message not received");
111 }
112 System.out.println("No message received (correct)");
113 return;
114 }
115
116 // datagram received
117
118 InetAddress sender = ((InetSocketAddress)sa).getAddress();
119 buf.flip();
120 byte[] bytes = new byte[buf.remaining()];
121 buf.get(bytes);
122 String s = new String(bytes, "UTF-8");
123 int receivedId = -1;
124 try {
125 receivedId = Integer.parseInt(s);
126 System.out.format("Received message from %s (id=0x%x)\n",
127 sender, receivedId);
128 } catch (NumberFormatException x) {
129 System.out.format("Received message from %s (msg=%s)\n", sender, s);
130 }
131
132 if (expectedSender == null) {
133 if (receivedId == id)
134 throw new RuntimeException("Message not expected");
135 System.out.println("Message ignored (has wrong id)");
136 } else {
137 if (sender.equals(expectedSender)) {
138 System.out.println("Message expected");
139 return;
140 }
141 System.out.println("Message ignored (wrong sender)");
142 }
143
144 sel.selectedKeys().clear();
145 buf.rewind();
146 }
147 } finally {
148 sel.close();
149 }
150 }
151
152
153 /**
154 * Exercise multicast send/receive on given group/interface
155 */
156 static void test(ProtocolFamily family,
157 NetworkInterface nif,
158 InetAddress group,
159 InetAddress source)
160 throws IOException
161 {
162 System.out.format("\nTest DatagramChannel to %s socket\n", family.name());
163 try (DatagramChannel dc = (family == UNSPEC) ?
164 DatagramChannel.open() : DatagramChannel.open(family)) {
165 dc.setOption(StandardSocketOptions.SO_REUSEADDR, true)
166 .bind(new InetSocketAddress(0));
167
168 // join group
169 System.out.format("join %s @ %s\n", group.getHostAddress(),
170 nif.getName());
171 MembershipKey key;
172 try {
173 key = dc.join(group, nif);
174 } catch (IllegalArgumentException iae) {
175 if (family == UNSPEC) {
176 System.out.println("Not supported");
177 return;
178 }
179 throw iae;
180 }
181
182 // send message to group
183 int port = ((InetSocketAddress)dc.getLocalAddress()).getPort();
184 int id = sendDatagram(source, nif, group, port);
185
186 // receive message and check id matches
187 receiveDatagram(dc, source, id);
188
189 // exclude-mode filtering
190
191 try {
192 System.out.format("block %s\n", source.getHostAddress());
193
194 // may throw UOE
195 key.block(source);
196 id = sendDatagram(source, nif, group, port);
197 receiveDatagram(dc, null, id);
198
199 // unblock source, send message, message should be received
200 System.out.format("unblock %s\n", source.getHostAddress());
201 key.unblock(source);
202 id = sendDatagram(source, nif, group, port);
203 receiveDatagram(dc, source, id);
204 } catch (UnsupportedOperationException x) {
205 String os = System.getProperty("os.name");
206 // Exclude-mode filtering supported on these platforms so UOE should never be thrown
207 if (os.equals("Linux"))
208 throw x;
209 System.out.println("Exclude-mode filtering not supported!");
210 }
211
212 key.drop();
213
214 // include-mode filtering
215
216 InetAddress bogus = (group instanceof Inet6Address) ?
217 InetAddress.getByName("fe80::1234") :
218 InetAddress.getByName("1.2.3.4");
219 System.out.format("join %s @ %s only-source %s\n", group.getHostAddress(),
220 nif.getName(), bogus.getHostAddress());
221 try {
222 // may throw UOE
223 key = dc.join(group, nif, bogus);
224
225 id = sendDatagram(source, nif, group, port);
226 receiveDatagram(dc, null, id);
227
228 System.out.format("join %s @ %s only-source %s\n", group.getHostAddress(),
229 nif.getName(), source.getHostAddress());
230 key = dc.join(group, nif, source);
231
232 id = sendDatagram(source, nif, group, port);
233 receiveDatagram(dc, source, id);
234 } catch (UnsupportedOperationException x) {
235 String os = System.getProperty("os.name");
236 // Include-mode filtering supported on these platforms so UOE should never be thrown
237 if (os.equals("Linux"))
238 throw x;
239 System.out.println("Include-mode filtering not supported!");
240 }
241 }
242 }
243
244 public static void main(String[] args) throws IOException {
245 IPSupport.throwSkippedExceptionIfNonOperational();
246
247 // IPv4 and IPv6 interfaces that support multicasting
248 NetworkConfiguration config = NetworkConfiguration.probe();
249 List<NetworkInterface> ip4MulticastInterfaces = config.ip4MulticastInterfaces()
250 .collect(Collectors.toList());
251 List<NetworkInterface> ip6MulticastInterfaces = config.ip6MulticastInterfaces()
252 .collect(Collectors.toList());
253
254 // multicast groups used for the test
255 InetAddress ip4Group = InetAddress.getByName("225.4.5.6");
256 InetAddress ip6Group = InetAddress.getByName("ff02::a");
257
258 // Platforms that allow dual sockets join IPv4 multicast groups
259 boolean canIPv6JoinIPv4Group =
260 Platform.isLinux() ||
261 Platform.isOSX() ||
262 Platform.isWindows();
263
264 for (NetworkInterface nif : ip4MulticastInterfaces) {
265 InetAddress source = config.ip4Addresses(nif).iterator().next();
266 test(UNSPEC, nif, ip4Group, source);
267 test(INET, nif, ip4Group, source);
268 if (IPSupport.hasIPv6() && canIPv6JoinIPv4Group) {
269 test(INET6, nif, ip4Group, source);
270 }
271 }
272
273 for (NetworkInterface nif : ip6MulticastInterfaces) {
274 InetAddress source = config.ip6Addresses(nif).iterator().next();
275 test(UNSPEC, nif, ip6Group, source);
276 test(INET6, nif, ip6Group, source);
277 }
278 }
279 }