1 /*
2 * Copyright (c) 1995, 2007, 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. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package java.net;
27
28 import java.io.FileDescriptor;
29 import java.io.IOException;
30 import java.io.InterruptedIOException;
31 import java.nio.channels.DatagramChannel;
32 import java.security.AccessController;
33 import java.security.PrivilegedExceptionAction;
34
35 /**
36 * This class represents a socket for sending and receiving datagram packets.
37 *
38 * <p>A datagram socket is the sending or receiving point for a packet
39 * delivery service. Each packet sent or received on a datagram socket
40 * is individually addressed and routed. Multiple packets sent from
41 * one machine to another may be routed differently, and may arrive in
42 * any order.
43 *
44 * <p>UDP broadcasts sends are always enabled on a DatagramSocket.
45 * In order to receive broadcast packets a DatagramSocket
46 * should be bound to the wildcard address. In some
47 * implementations, broadcast packets may also be received when
48 * a DatagramSocket is bound to a more specific address.
49 * <p>
50 * Example:
305 private void checkOldImpl() {
306 if (impl == null)
307 return;
308 // DatagramSocketImpl.peekdata() is a protected method, therefore we need to use
309 // getDeclaredMethod, therefore we need permission to access the member
310 try {
311 AccessController.doPrivileged(
312 new PrivilegedExceptionAction<Void>() {
313 public Void run() throws NoSuchMethodException {
314 Class[] cl = new Class[1];
315 cl[0] = DatagramPacket.class;
316 impl.getClass().getDeclaredMethod("peekData", cl);
317 return null;
318 }
319 });
320 } catch (java.security.PrivilegedActionException e) {
321 oldImpl = true;
322 }
323 }
324
325 static Class implClass = null;
326
327 void createImpl() throws SocketException {
328 if (impl == null) {
329 if (factory != null) {
330 impl = factory.createDatagramSocketImpl();
331 checkOldImpl();
332 } else {
333 boolean isMulticast = (this instanceof MulticastSocket) ? true : false;
334 impl = DefaultDatagramSocketImplFactory.createDatagramSocketImpl(isMulticast);
335
336 checkOldImpl();
337 }
338 }
339 // creates a udp socket
340 impl.create();
341 created = true;
342 }
343
344 /**
345 * Get the <code>DatagramSocketImpl</code> attached to this socket,
|
1 /*
2 * Copyright (c) 1995, 2011, 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. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package java.net;
27
28 import java.io.IOException;
29 import java.nio.channels.DatagramChannel;
30 import java.security.AccessController;
31 import java.security.PrivilegedExceptionAction;
32
33 /**
34 * This class represents a socket for sending and receiving datagram packets.
35 *
36 * <p>A datagram socket is the sending or receiving point for a packet
37 * delivery service. Each packet sent or received on a datagram socket
38 * is individually addressed and routed. Multiple packets sent from
39 * one machine to another may be routed differently, and may arrive in
40 * any order.
41 *
42 * <p>UDP broadcasts sends are always enabled on a DatagramSocket.
43 * In order to receive broadcast packets a DatagramSocket
44 * should be bound to the wildcard address. In some
45 * implementations, broadcast packets may also be received when
46 * a DatagramSocket is bound to a more specific address.
47 * <p>
48 * Example:
303 private void checkOldImpl() {
304 if (impl == null)
305 return;
306 // DatagramSocketImpl.peekdata() is a protected method, therefore we need to use
307 // getDeclaredMethod, therefore we need permission to access the member
308 try {
309 AccessController.doPrivileged(
310 new PrivilegedExceptionAction<Void>() {
311 public Void run() throws NoSuchMethodException {
312 Class[] cl = new Class[1];
313 cl[0] = DatagramPacket.class;
314 impl.getClass().getDeclaredMethod("peekData", cl);
315 return null;
316 }
317 });
318 } catch (java.security.PrivilegedActionException e) {
319 oldImpl = true;
320 }
321 }
322
323 static Class<?> implClass = null;
324
325 void createImpl() throws SocketException {
326 if (impl == null) {
327 if (factory != null) {
328 impl = factory.createDatagramSocketImpl();
329 checkOldImpl();
330 } else {
331 boolean isMulticast = (this instanceof MulticastSocket) ? true : false;
332 impl = DefaultDatagramSocketImplFactory.createDatagramSocketImpl(isMulticast);
333
334 checkOldImpl();
335 }
336 }
337 // creates a udp socket
338 impl.create();
339 created = true;
340 }
341
342 /**
343 * Get the <code>DatagramSocketImpl</code> attached to this socket,
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