J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1995-2007 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any 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: |
| 51 | * <code> |
| 52 | * DatagramSocket s = new DatagramSocket(null); |
| 53 | * s.bind(new InetSocketAddress(8888)); |
| 54 | * </code> |
| 55 | * Which is equivalent to: |
| 56 | * <code> |
| 57 | * DatagramSocket s = new DatagramSocket(8888); |
| 58 | * </code> |
| 59 | * Both cases will create a DatagramSocket able to receive broadcasts on |
| 60 | * UDP port 8888. |
| 61 | * |
| 62 | * @author Pavani Diwanji |
| 63 | * @see java.net.DatagramPacket |
| 64 | * @see java.nio.channels.DatagramChannel |
| 65 | * @since JDK1.0 |
| 66 | */ |
| 67 | public |
| 68 | class DatagramSocket implements java.io.Closeable { |
| 69 | /** |
| 70 | * Various states of this socket. |
| 71 | */ |
| 72 | private boolean created = false; |
| 73 | private boolean bound = false; |
| 74 | private boolean closed = false; |
| 75 | private Object closeLock = new Object(); |
| 76 | |
| 77 | /* |
| 78 | * The implementation of this DatagramSocket. |
| 79 | */ |
| 80 | DatagramSocketImpl impl; |
| 81 | |
| 82 | /** |
| 83 | * Are we using an older DatagramSocketImpl? |
| 84 | */ |
| 85 | boolean oldImpl = false; |
| 86 | |
| 87 | /* |
| 88 | * Connection state: |
| 89 | * ST_NOT_CONNECTED = socket not connected |
| 90 | * ST_CONNECTED = socket connected |
| 91 | * ST_CONNECTED_NO_IMPL = socket connected but not at impl level |
| 92 | */ |
| 93 | static final int ST_NOT_CONNECTED = 0; |
| 94 | static final int ST_CONNECTED = 1; |
| 95 | static final int ST_CONNECTED_NO_IMPL = 2; |
| 96 | |
| 97 | int connectState = ST_NOT_CONNECTED; |
| 98 | |
| 99 | /* |
| 100 | * Connected address & port |
| 101 | */ |
| 102 | InetAddress connectedAddress = null; |
| 103 | int connectedPort = -1; |
| 104 | |
| 105 | /** |
| 106 | * Connects this socket to a remote socket address (IP address + port number). |
| 107 | * Binds socket if not already bound. |
| 108 | * <p> |
| 109 | * @param addr The remote address. |
| 110 | * @param port The remote port |
| 111 | * @throws SocketException if binding the socket fails. |
| 112 | */ |
| 113 | private synchronized void connectInternal(InetAddress address, int port) throws SocketException { |
| 114 | if (port < 0 || port > 0xFFFF) { |
| 115 | throw new IllegalArgumentException("connect: " + port); |
| 116 | } |
| 117 | if (address == null) { |
| 118 | throw new IllegalArgumentException("connect: null address"); |
| 119 | } |
| 120 | if (isClosed()) |
| 121 | return; |
| 122 | SecurityManager security = System.getSecurityManager(); |
| 123 | if (security != null) { |
| 124 | if (address.isMulticastAddress()) { |
| 125 | security.checkMulticast(address); |
| 126 | } else { |
| 127 | security.checkConnect(address.getHostAddress(), port); |
| 128 | security.checkAccept(address.getHostAddress(), port); |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | if (!isBound()) |
| 133 | bind(new InetSocketAddress(0)); |
| 134 | |
| 135 | // old impls do not support connect/disconnect |
| 136 | if (oldImpl) { |
| 137 | connectState = ST_CONNECTED_NO_IMPL; |
| 138 | } else { |
| 139 | try { |
| 140 | getImpl().connect(address, port); |
| 141 | |
| 142 | // socket is now connected by the impl |
| 143 | connectState = ST_CONNECTED; |
| 144 | } catch (SocketException se) { |
| 145 | |
| 146 | // connection will be emulated by DatagramSocket |
| 147 | connectState = ST_CONNECTED_NO_IMPL; |
| 148 | } |
| 149 | } |
| 150 | |
| 151 | connectedAddress = address; |
| 152 | connectedPort = port; |
| 153 | } |
| 154 | |
| 155 | |
| 156 | /** |
| 157 | * Constructs a datagram socket and binds it to any available port |
| 158 | * on the local host machine. The socket will be bound to the |
| 159 | * {@link InetAddress#isAnyLocalAddress wildcard} address, |
| 160 | * an IP address chosen by the kernel. |
| 161 | * |
| 162 | * <p>If there is a security manager, |
| 163 | * its <code>checkListen</code> method is first called |
| 164 | * with 0 as its argument to ensure the operation is allowed. |
| 165 | * This could result in a SecurityException. |
| 166 | * |
| 167 | * @exception SocketException if the socket could not be opened, |
| 168 | * or the socket could not bind to the specified local port. |
| 169 | * @exception SecurityException if a security manager exists and its |
| 170 | * <code>checkListen</code> method doesn't allow the operation. |
| 171 | * |
| 172 | * @see SecurityManager#checkListen |
| 173 | */ |
| 174 | public DatagramSocket() throws SocketException { |
| 175 | // create a datagram socket. |
| 176 | createImpl(); |
| 177 | try { |
| 178 | bind(new InetSocketAddress(0)); |
| 179 | } catch (SocketException se) { |
| 180 | throw se; |
| 181 | } catch(IOException e) { |
| 182 | throw new SocketException(e.getMessage()); |
| 183 | } |
| 184 | } |
| 185 | |
| 186 | /** |
| 187 | * Creates an unbound datagram socket with the specified |
| 188 | * DatagramSocketImpl. |
| 189 | * |
| 190 | * @param impl an instance of a <B>DatagramSocketImpl</B> |
| 191 | * the subclass wishes to use on the DatagramSocket. |
| 192 | * @since 1.4 |
| 193 | */ |
| 194 | protected DatagramSocket(DatagramSocketImpl impl) { |
| 195 | if (impl == null) |
| 196 | throw new NullPointerException(); |
| 197 | this.impl = impl; |
| 198 | checkOldImpl(); |
| 199 | } |
| 200 | |
| 201 | /** |
| 202 | * Creates a datagram socket, bound to the specified local |
| 203 | * socket address. |
| 204 | * <p> |
| 205 | * If, if the address is <code>null</code>, creates an unbound socket. |
| 206 | * <p> |
| 207 | * <p>If there is a security manager, |
| 208 | * its <code>checkListen</code> method is first called |
| 209 | * with the port from the socket address |
| 210 | * as its argument to ensure the operation is allowed. |
| 211 | * This could result in a SecurityException. |
| 212 | * |
| 213 | * @param bindaddr local socket address to bind, or <code>null</code> |
| 214 | * for an unbound socket. |
| 215 | * |
| 216 | * @exception SocketException if the socket could not be opened, |
| 217 | * or the socket could not bind to the specified local port. |
| 218 | * @exception SecurityException if a security manager exists and its |
| 219 | * <code>checkListen</code> method doesn't allow the operation. |
| 220 | * |
| 221 | * @see SecurityManager#checkListen |
| 222 | * @since 1.4 |
| 223 | */ |
| 224 | public DatagramSocket(SocketAddress bindaddr) throws SocketException { |
| 225 | // create a datagram socket. |
| 226 | createImpl(); |
| 227 | if (bindaddr != null) { |
| 228 | bind(bindaddr); |
| 229 | } |
| 230 | } |
| 231 | |
| 232 | /** |
| 233 | * Constructs a datagram socket and binds it to the specified port |
| 234 | * on the local host machine. The socket will be bound to the |
| 235 | * {@link InetAddress#isAnyLocalAddress wildcard} address, |
| 236 | * an IP address chosen by the kernel. |
| 237 | * |
| 238 | * <p>If there is a security manager, |
| 239 | * its <code>checkListen</code> method is first called |
| 240 | * with the <code>port</code> argument |
| 241 | * as its argument to ensure the operation is allowed. |
| 242 | * This could result in a SecurityException. |
| 243 | * |
| 244 | * @param port port to use. |
| 245 | * @exception SocketException if the socket could not be opened, |
| 246 | * or the socket could not bind to the specified local port. |
| 247 | * @exception SecurityException if a security manager exists and its |
| 248 | * <code>checkListen</code> method doesn't allow the operation. |
| 249 | * |
| 250 | * @see SecurityManager#checkListen |
| 251 | */ |
| 252 | public DatagramSocket(int port) throws SocketException { |
| 253 | this(port, null); |
| 254 | } |
| 255 | |
| 256 | /** |
| 257 | * Creates a datagram socket, bound to the specified local |
| 258 | * address. The local port must be between 0 and 65535 inclusive. |
| 259 | * If the IP address is 0.0.0.0, the socket will be bound to the |
| 260 | * {@link InetAddress#isAnyLocalAddress wildcard} address, |
| 261 | * an IP address chosen by the kernel. |
| 262 | * |
| 263 | * <p>If there is a security manager, |
| 264 | * its <code>checkListen</code> method is first called |
| 265 | * with the <code>port</code> argument |
| 266 | * as its argument to ensure the operation is allowed. |
| 267 | * This could result in a SecurityException. |
| 268 | * |
| 269 | * @param port local port to use |
| 270 | * @param laddr local address to bind |
| 271 | * |
| 272 | * @exception SocketException if the socket could not be opened, |
| 273 | * or the socket could not bind to the specified local port. |
| 274 | * @exception SecurityException if a security manager exists and its |
| 275 | * <code>checkListen</code> method doesn't allow the operation. |
| 276 | * |
| 277 | * @see SecurityManager#checkListen |
| 278 | * @since JDK1.1 |
| 279 | */ |
| 280 | public DatagramSocket(int port, InetAddress laddr) throws SocketException { |
| 281 | this(new InetSocketAddress(laddr, port)); |
| 282 | } |
| 283 | |
| 284 | private void checkOldImpl() { |
| 285 | if (impl == null) |
| 286 | return; |
| 287 | // DatagramSocketImpl.peekdata() is a protected method, therefore we need to use |
| 288 | // getDeclaredMethod, therefore we need permission to access the member |
| 289 | try { |
| 290 | AccessController.doPrivileged(new PrivilegedExceptionAction() { |
| 291 | public Object run() throws NoSuchMethodException { |
| 292 | Class[] cl = new Class[1]; |
| 293 | cl[0] = DatagramPacket.class; |
| 294 | impl.getClass().getDeclaredMethod("peekData", cl); |
| 295 | return null; |
| 296 | } |
| 297 | }); |
| 298 | } catch (java.security.PrivilegedActionException e) { |
| 299 | oldImpl = true; |
| 300 | } |
| 301 | } |
| 302 | |
| 303 | static Class implClass = null; |
| 304 | |
| 305 | void createImpl() throws SocketException { |
| 306 | if (impl == null) { |
| 307 | if (factory != null) { |
| 308 | impl = factory.createDatagramSocketImpl(); |
| 309 | checkOldImpl(); |
| 310 | } else { |
| 311 | boolean isMulticast = (this instanceof MulticastSocket) ? true : false; |
| 312 | impl = DefaultDatagramSocketImplFactory.createDatagramSocketImpl(isMulticast); |
| 313 | |
| 314 | checkOldImpl(); |
| 315 | } |
| 316 | } |
| 317 | // creates a udp socket |
| 318 | impl.create(); |
| 319 | created = true; |
| 320 | } |
| 321 | |
| 322 | /** |
| 323 | * Get the <code>DatagramSocketImpl</code> attached to this socket, |
| 324 | * creating it if necessary. |
| 325 | * |
| 326 | * @return the <code>DatagramSocketImpl</code> attached to that |
| 327 | * DatagramSocket |
| 328 | * @throws SocketException if creation fails. |
| 329 | * @since 1.4 |
| 330 | */ |
| 331 | DatagramSocketImpl getImpl() throws SocketException { |
| 332 | if (!created) |
| 333 | createImpl(); |
| 334 | return impl; |
| 335 | } |
| 336 | |
| 337 | /** |
| 338 | * Binds this DatagramSocket to a specific address & port. |
| 339 | * <p> |
| 340 | * If the address is <code>null</code>, then the system will pick up |
| 341 | * an ephemeral port and a valid local address to bind the socket. |
| 342 | *<p> |
| 343 | * @param addr The address & port to bind to. |
| 344 | * @throws SocketException if any error happens during the bind, or if the |
| 345 | * socket is already bound. |
| 346 | * @throws SecurityException if a security manager exists and its |
| 347 | * <code>checkListen</code> method doesn't allow the operation. |
| 348 | * @throws IllegalArgumentException if addr is a SocketAddress subclass |
| 349 | * not supported by this socket. |
| 350 | * @since 1.4 |
| 351 | */ |
| 352 | public synchronized void bind(SocketAddress addr) throws SocketException { |
| 353 | if (isClosed()) |
| 354 | throw new SocketException("Socket is closed"); |
| 355 | if (isBound()) |
| 356 | throw new SocketException("already bound"); |
| 357 | if (addr == null) |
| 358 | addr = new InetSocketAddress(0); |
| 359 | if (!(addr instanceof InetSocketAddress)) |
| 360 | throw new IllegalArgumentException("Unsupported address type!"); |
| 361 | InetSocketAddress epoint = (InetSocketAddress) addr; |
| 362 | if (epoint.isUnresolved()) |
| 363 | throw new SocketException("Unresolved address"); |
| 364 | SecurityManager sec = System.getSecurityManager(); |
| 365 | if (sec != null) { |
| 366 | sec.checkListen(epoint.getPort()); |
| 367 | } |
| 368 | try { |
| 369 | getImpl().bind(epoint.getPort(), |
| 370 | epoint.getAddress()); |
| 371 | } catch (SocketException e) { |
| 372 | getImpl().close(); |
| 373 | throw e; |
| 374 | } |
| 375 | bound = true; |
| 376 | } |
| 377 | |
| 378 | /** |
| 379 | * Connects the socket to a remote address for this socket. When a |
| 380 | * socket is connected to a remote address, packets may only be |
| 381 | * sent to or received from that address. By default a datagram |
| 382 | * socket is not connected. |
| 383 | * |
| 384 | * <p>If the remote destination to which the socket is connected does not |
| 385 | * exist, or is otherwise unreachable, and if an ICMP destination unreachable |
| 386 | * packet has been received for that address, then a subsequent call to |
| 387 | * send or receive may throw a PortUnreachableException. Note, there is no |
| 388 | * guarantee that the exception will be thrown. |
| 389 | * |
| 390 | * <p>A caller's permission to send and receive datagrams to a |
| 391 | * given host and port are checked at connect time. When a socket |
| 392 | * is connected, receive and send <b>will not |
| 393 | * perform any security checks</b> on incoming and outgoing |
| 394 | * packets, other than matching the packet's and the socket's |
| 395 | * address and port. On a send operation, if the packet's address |
| 396 | * is set and the packet's address and the socket's address do not |
| 397 | * match, an IllegalArgumentException will be thrown. A socket |
| 398 | * connected to a multicast address may only be used to send packets. |
| 399 | * |
| 400 | * @param address the remote address for the socket |
| 401 | * |
| 402 | * @param port the remote port for the socket. |
| 403 | * |
| 404 | * @exception IllegalArgumentException if the address is null, |
| 405 | * or the port is out of range. |
| 406 | * |
| 407 | * @exception SecurityException if the caller is not allowed to |
| 408 | * send datagrams to and receive datagrams from the address and port. |
| 409 | * |
| 410 | * @see #disconnect |
| 411 | * @see #send |
| 412 | * @see #receive |
| 413 | */ |
| 414 | public void connect(InetAddress address, int port) { |
| 415 | try { |
| 416 | connectInternal(address, port); |
| 417 | } catch (SocketException se) { |
| 418 | throw new Error("connect failed", se); |
| 419 | } |
| 420 | } |
| 421 | |
| 422 | /** |
| 423 | * Connects this socket to a remote socket address (IP address + port number). |
| 424 | * <p> |
| 425 | * @param addr The remote address. |
| 426 | * @throws SocketException if the connect fails |
| 427 | * @throws IllegalArgumentException if addr is null or addr is a SocketAddress |
| 428 | * subclass not supported by this socket |
| 429 | * @since 1.4 |
| 430 | * @see #connect |
| 431 | */ |
| 432 | public void connect(SocketAddress addr) throws SocketException { |
| 433 | if (addr == null) |
| 434 | throw new IllegalArgumentException("Address can't be null"); |
| 435 | if (!(addr instanceof InetSocketAddress)) |
| 436 | throw new IllegalArgumentException("Unsupported address type"); |
| 437 | InetSocketAddress epoint = (InetSocketAddress) addr; |
| 438 | if (epoint.isUnresolved()) |
| 439 | throw new SocketException("Unresolved address"); |
| 440 | connectInternal(epoint.getAddress(), epoint.getPort()); |
| 441 | } |
| 442 | |
| 443 | /** |
| 444 | * Disconnects the socket. If the socket is closed or not connected, |
| 445 | * then this method has no effect. |
| 446 | * |
| 447 | * @see #connect |
| 448 | */ |
| 449 | public void disconnect() { |
| 450 | synchronized (this) { |
| 451 | if (isClosed()) |
| 452 | return; |
| 453 | if (connectState == ST_CONNECTED) { |
| 454 | impl.disconnect (); |
| 455 | } |
| 456 | connectedAddress = null; |
| 457 | connectedPort = -1; |
| 458 | connectState = ST_NOT_CONNECTED; |
| 459 | } |
| 460 | } |
| 461 | |
| 462 | /** |
| 463 | * Returns the binding state of the socket. |
| 464 | * <p> |
| 465 | * If the socket was bound prior to being {@link #close closed}, |
| 466 | * then this method will continue to return <code>true</code> |
| 467 | * after the socket is closed. |
| 468 | * |
| 469 | * @return true if the socket successfully bound to an address |
| 470 | * @since 1.4 |
| 471 | */ |
| 472 | public boolean isBound() { |
| 473 | return bound; |
| 474 | } |
| 475 | |
| 476 | /** |
| 477 | * Returns the connection state of the socket. |
| 478 | * <p> |
| 479 | * If the socket was connected prior to being {@link #close closed}, |
| 480 | * then this method will continue to return <code>true</code> |
| 481 | * after the socket is closed. |
| 482 | * |
| 483 | * @return true if the socket successfully connected to a server |
| 484 | * @since 1.4 |
| 485 | */ |
| 486 | public boolean isConnected() { |
| 487 | return connectState != ST_NOT_CONNECTED; |
| 488 | } |
| 489 | |
| 490 | /** |
| 491 | * Returns the address to which this socket is connected. Returns |
| 492 | * <code>null</code> if the socket is not connected. |
| 493 | * <p> |
| 494 | * If the socket was connected prior to being {@link #close closed}, |
| 495 | * then this method will continue to return the connected address |
| 496 | * after the socket is closed. |
| 497 | * |
| 498 | * @return the address to which this socket is connected. |
| 499 | */ |
| 500 | public InetAddress getInetAddress() { |
| 501 | return connectedAddress; |
| 502 | } |
| 503 | |
| 504 | /** |
| 505 | * Returns the port number to which this socket is connected. |
| 506 | * Returns <code>-1</code> if the socket is not connected. |
| 507 | * <p> |
| 508 | * If the socket was connected prior to being {@link #close closed}, |
| 509 | * then this method will continue to return the connected port number |
| 510 | * after the socket is closed. |
| 511 | * |
| 512 | * @return the port number to which this socket is connected. |
| 513 | */ |
| 514 | public int getPort() { |
| 515 | return connectedPort; |
| 516 | } |
| 517 | |
| 518 | /** |
| 519 | * Returns the address of the endpoint this socket is connected to, or |
| 520 | * <code>null</code> if it is unconnected. |
| 521 | * <p> |
| 522 | * If the socket was connected prior to being {@link #close closed}, |
| 523 | * then this method will continue to return the connected address |
| 524 | * after the socket is closed. |
| 525 | * |
| 526 | * @return a <code>SocketAddress</code> representing the remote |
| 527 | * endpoint of this socket, or <code>null</code> if it is |
| 528 | * not connected yet. |
| 529 | * @see #getInetAddress() |
| 530 | * @see #getPort() |
| 531 | * @see #connect(SocketAddress) |
| 532 | * @since 1.4 |
| 533 | */ |
| 534 | public SocketAddress getRemoteSocketAddress() { |
| 535 | if (!isConnected()) |
| 536 | return null; |
| 537 | return new InetSocketAddress(getInetAddress(), getPort()); |
| 538 | } |
| 539 | |
| 540 | /** |
| 541 | * Returns the address of the endpoint this socket is bound to. |
| 542 | * |
| 543 | * @return a <code>SocketAddress</code> representing the local endpoint of this |
| 544 | * socket, or <code>null</code> if it is closed or not bound yet. |
| 545 | * @see #getLocalAddress() |
| 546 | * @see #getLocalPort() |
| 547 | * @see #bind(SocketAddress) |
| 548 | * @since 1.4 |
| 549 | */ |
| 550 | |
| 551 | public SocketAddress getLocalSocketAddress() { |
| 552 | if (isClosed()) |
| 553 | return null; |
| 554 | if (!isBound()) |
| 555 | return null; |
| 556 | return new InetSocketAddress(getLocalAddress(), getLocalPort()); |
| 557 | } |
| 558 | |
| 559 | /** |
| 560 | * Sends a datagram packet from this socket. The |
| 561 | * <code>DatagramPacket</code> includes information indicating the |
| 562 | * data to be sent, its length, the IP address of the remote host, |
| 563 | * and the port number on the remote host. |
| 564 | * |
| 565 | * <p>If there is a security manager, and the socket is not currently |
| 566 | * connected to a remote address, this method first performs some |
| 567 | * security checks. First, if <code>p.getAddress().isMulticastAddress()</code> |
| 568 | * is true, this method calls the |
| 569 | * security manager's <code>checkMulticast</code> method |
| 570 | * with <code>p.getAddress()</code> as its argument. |
| 571 | * If the evaluation of that expression is false, |
| 572 | * this method instead calls the security manager's |
| 573 | * <code>checkConnect</code> method with arguments |
| 574 | * <code>p.getAddress().getHostAddress()</code> and |
| 575 | * <code>p.getPort()</code>. Each call to a security manager method |
| 576 | * could result in a SecurityException if the operation is not allowed. |
| 577 | * |
| 578 | * @param p the <code>DatagramPacket</code> to be sent. |
| 579 | * |
| 580 | * @exception IOException if an I/O error occurs. |
| 581 | * @exception SecurityException if a security manager exists and its |
| 582 | * <code>checkMulticast</code> or <code>checkConnect</code> |
| 583 | * method doesn't allow the send. |
| 584 | * @exception PortUnreachableException may be thrown if the socket is connected |
| 585 | * to a currently unreachable destination. Note, there is no |
| 586 | * guarantee that the exception will be thrown. |
| 587 | * @exception java.nio.channels.IllegalBlockingModeException |
| 588 | * if this socket has an associated channel, |
| 589 | * and the channel is in non-blocking mode. |
| 590 | * @exception IllegalArgumentException if the socket is connected, |
| 591 | * and connected address and packet address differ. |
| 592 | * |
| 593 | * @see java.net.DatagramPacket |
| 594 | * @see SecurityManager#checkMulticast(InetAddress) |
| 595 | * @see SecurityManager#checkConnect |
| 596 | * @revised 1.4 |
| 597 | * @spec JSR-51 |
| 598 | */ |
| 599 | public void send(DatagramPacket p) throws IOException { |
| 600 | InetAddress packetAddress = null; |
| 601 | synchronized (p) { |
| 602 | if (isClosed()) |
| 603 | throw new SocketException("Socket is closed"); |
| 604 | if (connectState == ST_NOT_CONNECTED) { |
| 605 | // check the address is ok wiht the security manager on every send. |
| 606 | SecurityManager security = System.getSecurityManager(); |
| 607 | |
| 608 | // The reason you want to synchronize on datagram packet |
| 609 | // is because you dont want an applet to change the address |
| 610 | // while you are trying to send the packet for example |
| 611 | // after the security check but before the send. |
| 612 | if (security != null) { |
| 613 | if (p.getAddress().isMulticastAddress()) { |
| 614 | security.checkMulticast(p.getAddress()); |
| 615 | } else { |
| 616 | security.checkConnect(p.getAddress().getHostAddress(), |
| 617 | p.getPort()); |
| 618 | } |
| 619 | } |
| 620 | } else { |
| 621 | // we're connected |
| 622 | packetAddress = p.getAddress(); |
| 623 | if (packetAddress == null) { |
| 624 | p.setAddress(connectedAddress); |
| 625 | p.setPort(connectedPort); |
| 626 | } else if ((!packetAddress.equals(connectedAddress)) || |
| 627 | p.getPort() != connectedPort) { |
| 628 | throw new IllegalArgumentException("connected address " + |
| 629 | "and packet address" + |
| 630 | " differ"); |
| 631 | } |
| 632 | } |
| 633 | // Check whether the socket is bound |
| 634 | if (!isBound()) |
| 635 | bind(new InetSocketAddress(0)); |
| 636 | // call the method to send |
| 637 | getImpl().send(p); |
| 638 | } |
| 639 | } |
| 640 | |
| 641 | /** |
| 642 | * Receives a datagram packet from this socket. When this method |
| 643 | * returns, the <code>DatagramPacket</code>'s buffer is filled with |
| 644 | * the data received. The datagram packet also contains the sender's |
| 645 | * IP address, and the port number on the sender's machine. |
| 646 | * <p> |
| 647 | * This method blocks until a datagram is received. The |
| 648 | * <code>length</code> field of the datagram packet object contains |
| 649 | * the length of the received message. If the message is longer than |
| 650 | * the packet's length, the message is truncated. |
| 651 | * <p> |
| 652 | * If there is a security manager, a packet cannot be received if the |
| 653 | * security manager's <code>checkAccept</code> method |
| 654 | * does not allow it. |
| 655 | * |
| 656 | * @param p the <code>DatagramPacket</code> into which to place |
| 657 | * the incoming data. |
| 658 | * @exception IOException if an I/O error occurs. |
| 659 | * @exception SocketTimeoutException if setSoTimeout was previously called |
| 660 | * and the timeout has expired. |
| 661 | * @exception PortUnreachableException may be thrown if the socket is connected |
| 662 | * to a currently unreachable destination. Note, there is no guarantee that the |
| 663 | * exception will be thrown. |
| 664 | * @exception java.nio.channels.IllegalBlockingModeException |
| 665 | * if this socket has an associated channel, |
| 666 | * and the channel is in non-blocking mode. |
| 667 | * @see java.net.DatagramPacket |
| 668 | * @see java.net.DatagramSocket |
| 669 | * @revised 1.4 |
| 670 | * @spec JSR-51 |
| 671 | */ |
| 672 | public synchronized void receive(DatagramPacket p) throws IOException { |
| 673 | synchronized (p) { |
| 674 | if (!isBound()) |
| 675 | bind(new InetSocketAddress(0)); |
| 676 | if (connectState == ST_NOT_CONNECTED) { |
| 677 | // check the address is ok with the security manager before every recv. |
| 678 | SecurityManager security = System.getSecurityManager(); |
| 679 | if (security != null) { |
| 680 | while(true) { |
| 681 | String peekAd = null; |
| 682 | int peekPort = 0; |
| 683 | // peek at the packet to see who it is from. |
| 684 | if (!oldImpl) { |
| 685 | // We can use the new peekData() API |
| 686 | DatagramPacket peekPacket = new DatagramPacket(new byte[1], 1); |
| 687 | peekPort = getImpl().peekData(peekPacket); |
| 688 | peekAd = peekPacket.getAddress().getHostAddress(); |
| 689 | } else { |
| 690 | InetAddress adr = new InetAddress(); |
| 691 | peekPort = getImpl().peek(adr); |
| 692 | peekAd = adr.getHostAddress(); |
| 693 | } |
| 694 | try { |
| 695 | security.checkAccept(peekAd, peekPort); |
| 696 | // security check succeeded - so now break |
| 697 | // and recv the packet. |
| 698 | break; |
| 699 | } catch (SecurityException se) { |
| 700 | // Throw away the offending packet by consuming |
| 701 | // it in a tmp buffer. |
| 702 | DatagramPacket tmp = new DatagramPacket(new byte[1], 1); |
| 703 | getImpl().receive(tmp); |
| 704 | |
| 705 | // silently discard the offending packet |
| 706 | // and continue: unknown/malicious |
| 707 | // entities on nets should not make |
| 708 | // runtime throw security exception and |
| 709 | // disrupt the applet by sending random |
| 710 | // datagram packets. |
| 711 | continue; |
| 712 | } |
| 713 | } // end of while |
| 714 | } |
| 715 | } |
| 716 | if (connectState == ST_CONNECTED_NO_IMPL) { |
| 717 | // We have to do the filtering the old fashioned way since |
| 718 | // the native impl doesn't support connect or the connect |
| 719 | // via the impl failed. |
| 720 | boolean stop = false; |
| 721 | while (!stop) { |
| 722 | // peek at the packet to see who it is from. |
| 723 | InetAddress peekAddress = new InetAddress(); |
| 724 | int peekPort = getImpl().peek(peekAddress); |
| 725 | if ((!connectedAddress.equals(peekAddress)) || |
| 726 | (connectedPort != peekPort)) { |
| 727 | // throw the packet away and silently continue |
| 728 | DatagramPacket tmp = new DatagramPacket(new byte[1], 1); |
| 729 | getImpl().receive(tmp); |
| 730 | } else { |
| 731 | stop = true; |
| 732 | } |
| 733 | } |
| 734 | } |
| 735 | // If the security check succeeds, or the datagram is |
| 736 | // connected then receive the packet |
| 737 | getImpl().receive(p); |
| 738 | } |
| 739 | } |
| 740 | |
| 741 | /** |
| 742 | * Gets the local address to which the socket is bound. |
| 743 | * |
| 744 | * <p>If there is a security manager, its |
| 745 | * <code>checkConnect</code> method is first called |
| 746 | * with the host address and <code>-1</code> |
| 747 | * as its arguments to see if the operation is allowed. |
| 748 | * |
| 749 | * @see SecurityManager#checkConnect |
| 750 | * @return the local address to which the socket is bound, |
| 751 | * <code>null</code> if the socket is closed, or |
| 752 | * an <code>InetAddress</code> representing |
| 753 | * {@link InetAddress#isAnyLocalAddress wildcard} |
| 754 | * address if either the socket is not bound, or |
| 755 | * the security manager <code>checkConnect</code> |
| 756 | * method does not allow the operation |
| 757 | * @since 1.1 |
| 758 | */ |
| 759 | public InetAddress getLocalAddress() { |
| 760 | if (isClosed()) |
| 761 | return null; |
| 762 | InetAddress in = null; |
| 763 | try { |
| 764 | in = (InetAddress) getImpl().getOption(SocketOptions.SO_BINDADDR); |
| 765 | if (in.isAnyLocalAddress()) { |
| 766 | in = InetAddress.anyLocalAddress(); |
| 767 | } |
| 768 | SecurityManager s = System.getSecurityManager(); |
| 769 | if (s != null) { |
| 770 | s.checkConnect(in.getHostAddress(), -1); |
| 771 | } |
| 772 | } catch (Exception e) { |
| 773 | in = InetAddress.anyLocalAddress(); // "0.0.0.0" |
| 774 | } |
| 775 | return in; |
| 776 | } |
| 777 | |
| 778 | /** |
| 779 | * Returns the port number on the local host to which this socket |
| 780 | * is bound. |
| 781 | * |
| 782 | * @return the port number on the local host to which this socket is bound, |
| 783 | <code>-1</code> if the socket is closed, or |
| 784 | <code>0</code> if it is not bound yet. |
| 785 | */ |
| 786 | public int getLocalPort() { |
| 787 | if (isClosed()) |
| 788 | return -1; |
| 789 | try { |
| 790 | return getImpl().getLocalPort(); |
| 791 | } catch (Exception e) { |
| 792 | return 0; |
| 793 | } |
| 794 | } |
| 795 | |
| 796 | /** Enable/disable SO_TIMEOUT with the specified timeout, in |
| 797 | * milliseconds. With this option set to a non-zero timeout, |
| 798 | * a call to receive() for this DatagramSocket |
| 799 | * will block for only this amount of time. If the timeout expires, |
| 800 | * a <B>java.net.SocketTimeoutException</B> is raised, though the |
| 801 | * DatagramSocket is still valid. The option <B>must</B> be enabled |
| 802 | * prior to entering the blocking operation to have effect. The |
| 803 | * timeout must be > 0. |
| 804 | * A timeout of zero is interpreted as an infinite timeout. |
| 805 | * |
| 806 | * @param timeout the specified timeout in milliseconds. |
| 807 | * @throws SocketException if there is an error in the underlying protocol, such as an UDP error. |
| 808 | * @since JDK1.1 |
| 809 | * @see #getSoTimeout() |
| 810 | */ |
| 811 | public synchronized void setSoTimeout(int timeout) throws SocketException { |
| 812 | if (isClosed()) |
| 813 | throw new SocketException("Socket is closed"); |
| 814 | getImpl().setOption(SocketOptions.SO_TIMEOUT, new Integer(timeout)); |
| 815 | } |
| 816 | |
| 817 | /** |
| 818 | * Retrieve setting for SO_TIMEOUT. 0 returns implies that the |
| 819 | * option is disabled (i.e., timeout of infinity). |
| 820 | * |
| 821 | * @return the setting for SO_TIMEOUT |
| 822 | * @throws SocketException if there is an error in the underlying protocol, such as an UDP error. |
| 823 | * @since JDK1.1 |
| 824 | * @see #setSoTimeout(int) |
| 825 | */ |
| 826 | public synchronized int getSoTimeout() throws SocketException { |
| 827 | if (isClosed()) |
| 828 | throw new SocketException("Socket is closed"); |
| 829 | if (getImpl() == null) |
| 830 | return 0; |
| 831 | Object o = getImpl().getOption(SocketOptions.SO_TIMEOUT); |
| 832 | /* extra type safety */ |
| 833 | if (o instanceof Integer) { |
| 834 | return ((Integer) o).intValue(); |
| 835 | } else { |
| 836 | return 0; |
| 837 | } |
| 838 | } |
| 839 | |
| 840 | /** |
| 841 | * Sets the SO_SNDBUF option to the specified value for this |
| 842 | * <tt>DatagramSocket</tt>. The SO_SNDBUF option is used by the |
| 843 | * network implementation as a hint to size the underlying |
| 844 | * network I/O buffers. The SO_SNDBUF setting may also be used |
| 845 | * by the network implementation to determine the maximum size |
| 846 | * of the packet that can be sent on this socket. |
| 847 | * <p> |
| 848 | * As SO_SNDBUF is a hint, applications that want to verify |
| 849 | * what size the buffer is should call {@link #getSendBufferSize()}. |
| 850 | * <p> |
| 851 | * Increasing the buffer size may allow multiple outgoing packets |
| 852 | * to be queued by the network implementation when the send rate |
| 853 | * is high. |
| 854 | * <p> |
| 855 | * Note: If {@link #send(DatagramPacket)} is used to send a |
| 856 | * <code>DatagramPacket</code> that is larger than the setting |
| 857 | * of SO_SNDBUF then it is implementation specific if the |
| 858 | * packet is sent or discarded. |
| 859 | * |
| 860 | * @param size the size to which to set the send buffer |
| 861 | * size. This value must be greater than 0. |
| 862 | * |
| 863 | * @exception SocketException if there is an error |
| 864 | * in the underlying protocol, such as an UDP error. |
| 865 | * @exception IllegalArgumentException if the value is 0 or is |
| 866 | * negative. |
| 867 | * @see #getSendBufferSize() |
| 868 | */ |
| 869 | public synchronized void setSendBufferSize(int size) |
| 870 | throws SocketException{ |
| 871 | if (!(size > 0)) { |
| 872 | throw new IllegalArgumentException("negative send size"); |
| 873 | } |
| 874 | if (isClosed()) |
| 875 | throw new SocketException("Socket is closed"); |
| 876 | getImpl().setOption(SocketOptions.SO_SNDBUF, new Integer(size)); |
| 877 | } |
| 878 | |
| 879 | /** |
| 880 | * Get value of the SO_SNDBUF option for this <tt>DatagramSocket</tt>, that is the |
| 881 | * buffer size used by the platform for output on this <tt>DatagramSocket</tt>. |
| 882 | * |
| 883 | * @return the value of the SO_SNDBUF option for this <tt>DatagramSocket</tt> |
| 884 | * @exception SocketException if there is an error in |
| 885 | * the underlying protocol, such as an UDP error. |
| 886 | * @see #setSendBufferSize |
| 887 | */ |
| 888 | public synchronized int getSendBufferSize() throws SocketException { |
| 889 | if (isClosed()) |
| 890 | throw new SocketException("Socket is closed"); |
| 891 | int result = 0; |
| 892 | Object o = getImpl().getOption(SocketOptions.SO_SNDBUF); |
| 893 | if (o instanceof Integer) { |
| 894 | result = ((Integer)o).intValue(); |
| 895 | } |
| 896 | return result; |
| 897 | } |
| 898 | |
| 899 | /** |
| 900 | * Sets the SO_RCVBUF option to the specified value for this |
| 901 | * <tt>DatagramSocket</tt>. The SO_RCVBUF option is used by the |
| 902 | * the network implementation as a hint to size the underlying |
| 903 | * network I/O buffers. The SO_RCVBUF setting may also be used |
| 904 | * by the network implementation to determine the maximum size |
| 905 | * of the packet that can be received on this socket. |
| 906 | * <p> |
| 907 | * Because SO_RCVBUF is a hint, applications that want to |
| 908 | * verify what size the buffers were set to should call |
| 909 | * {@link #getReceiveBufferSize()}. |
| 910 | * <p> |
| 911 | * Increasing SO_RCVBUF may allow the network implementation |
| 912 | * to buffer multiple packets when packets arrive faster than |
| 913 | * are being received using {@link #receive(DatagramPacket)}. |
| 914 | * <p> |
| 915 | * Note: It is implementation specific if a packet larger |
| 916 | * than SO_RCVBUF can be received. |
| 917 | * |
| 918 | * @param size the size to which to set the receive buffer |
| 919 | * size. This value must be greater than 0. |
| 920 | * |
| 921 | * @exception SocketException if there is an error in |
| 922 | * the underlying protocol, such as an UDP error. |
| 923 | * @exception IllegalArgumentException if the value is 0 or is |
| 924 | * negative. |
| 925 | * @see #getReceiveBufferSize() |
| 926 | */ |
| 927 | public synchronized void setReceiveBufferSize(int size) |
| 928 | throws SocketException{ |
| 929 | if (size <= 0) { |
| 930 | throw new IllegalArgumentException("invalid receive size"); |
| 931 | } |
| 932 | if (isClosed()) |
| 933 | throw new SocketException("Socket is closed"); |
| 934 | getImpl().setOption(SocketOptions.SO_RCVBUF, new Integer(size)); |
| 935 | } |
| 936 | |
| 937 | /** |
| 938 | * Get value of the SO_RCVBUF option for this <tt>DatagramSocket</tt>, that is the |
| 939 | * buffer size used by the platform for input on this <tt>DatagramSocket</tt>. |
| 940 | * |
| 941 | * @return the value of the SO_RCVBUF option for this <tt>DatagramSocket</tt> |
| 942 | * @exception SocketException if there is an error in the underlying protocol, such as an UDP error. |
| 943 | * @see #setReceiveBufferSize(int) |
| 944 | */ |
| 945 | public synchronized int getReceiveBufferSize() |
| 946 | throws SocketException{ |
| 947 | if (isClosed()) |
| 948 | throw new SocketException("Socket is closed"); |
| 949 | int result = 0; |
| 950 | Object o = getImpl().getOption(SocketOptions.SO_RCVBUF); |
| 951 | if (o instanceof Integer) { |
| 952 | result = ((Integer)o).intValue(); |
| 953 | } |
| 954 | return result; |
| 955 | } |
| 956 | |
| 957 | /** |
| 958 | * Enable/disable the SO_REUSEADDR socket option. |
| 959 | * <p> |
| 960 | * For UDP sockets it may be necessary to bind more than one |
| 961 | * socket to the same socket address. This is typically for the |
| 962 | * purpose of receiving multicast packets |
| 963 | * (See {@link java.net.MulticastSocket}). The |
| 964 | * <tt>SO_REUSEADDR</tt> socket option allows multiple |
| 965 | * sockets to be bound to the same socket address if the |
| 966 | * <tt>SO_REUSEADDR</tt> socket option is enabled prior |
| 967 | * to binding the socket using {@link #bind(SocketAddress)}. |
| 968 | * <p> |
| 969 | * Note: This functionality is not supported by all existing platforms, |
| 970 | * so it is implementation specific whether this option will be ignored |
| 971 | * or not. However, if it is not supported then |
| 972 | * {@link #getReuseAddress()} will always return <code>false</code>. |
| 973 | * <p> |
| 974 | * When a <tt>DatagramSocket</tt> is created the initial setting |
| 975 | * of <tt>SO_REUSEADDR</tt> is disabled. |
| 976 | * <p> |
| 977 | * The behaviour when <tt>SO_REUSEADDR</tt> is enabled or |
| 978 | * disabled after a socket is bound (See {@link #isBound()}) |
| 979 | * is not defined. |
| 980 | * |
| 981 | * @param on whether to enable or disable the |
| 982 | * @exception SocketException if an error occurs enabling or |
| 983 | * disabling the <tt>SO_RESUEADDR</tt> socket option, |
| 984 | * or the socket is closed. |
| 985 | * @since 1.4 |
| 986 | * @see #getReuseAddress() |
| 987 | * @see #bind(SocketAddress) |
| 988 | * @see #isBound() |
| 989 | * @see #isClosed() |
| 990 | */ |
| 991 | public synchronized void setReuseAddress(boolean on) throws SocketException { |
| 992 | if (isClosed()) |
| 993 | throw new SocketException("Socket is closed"); |
| 994 | // Integer instead of Boolean for compatibility with older DatagramSocketImpl |
| 995 | if (oldImpl) |
| 996 | getImpl().setOption(SocketOptions.SO_REUSEADDR, new Integer(on?-1:0)); |
| 997 | else |
| 998 | getImpl().setOption(SocketOptions.SO_REUSEADDR, Boolean.valueOf(on)); |
| 999 | } |
| 1000 | |
| 1001 | /** |
| 1002 | * Tests if SO_REUSEADDR is enabled. |
| 1003 | * |
| 1004 | * @return a <code>boolean</code> indicating whether or not SO_REUSEADDR is enabled. |
| 1005 | * @exception SocketException if there is an error |
| 1006 | * in the underlying protocol, such as an UDP error. |
| 1007 | * @since 1.4 |
| 1008 | * @see #setReuseAddress(boolean) |
| 1009 | */ |
| 1010 | public synchronized boolean getReuseAddress() throws SocketException { |
| 1011 | if (isClosed()) |
| 1012 | throw new SocketException("Socket is closed"); |
| 1013 | Object o = getImpl().getOption(SocketOptions.SO_REUSEADDR); |
| 1014 | return ((Boolean)o).booleanValue(); |
| 1015 | } |
| 1016 | |
| 1017 | /** |
| 1018 | * Enable/disable SO_BROADCAST. |
| 1019 | * @param on whether or not to have broadcast turned on. |
| 1020 | * @exception SocketException if there is an error |
| 1021 | * in the underlying protocol, such as an UDP error. |
| 1022 | * @since 1.4 |
| 1023 | * @see #getBroadcast() |
| 1024 | */ |
| 1025 | public synchronized void setBroadcast(boolean on) throws SocketException { |
| 1026 | if (isClosed()) |
| 1027 | throw new SocketException("Socket is closed"); |
| 1028 | getImpl().setOption(SocketOptions.SO_BROADCAST, Boolean.valueOf(on)); |
| 1029 | } |
| 1030 | |
| 1031 | /** |
| 1032 | * Tests if SO_BROADCAST is enabled. |
| 1033 | * @return a <code>boolean</code> indicating whether or not SO_BROADCAST is enabled. |
| 1034 | * @exception SocketException if there is an error |
| 1035 | * in the underlying protocol, such as an UDP error. |
| 1036 | * @since 1.4 |
| 1037 | * @see #setBroadcast(boolean) |
| 1038 | */ |
| 1039 | public synchronized boolean getBroadcast() throws SocketException { |
| 1040 | if (isClosed()) |
| 1041 | throw new SocketException("Socket is closed"); |
| 1042 | return ((Boolean)(getImpl().getOption(SocketOptions.SO_BROADCAST))).booleanValue(); |
| 1043 | } |
| 1044 | |
| 1045 | /** |
| 1046 | * Sets traffic class or type-of-service octet in the IP |
| 1047 | * datagram header for datagrams sent from this DatagramSocket. |
| 1048 | * As the underlying network implementation may ignore this |
| 1049 | * value applications should consider it a hint. |
| 1050 | * |
| 1051 | * <P> The tc <B>must</B> be in the range <code> 0 <= tc <= |
| 1052 | * 255</code> or an IllegalArgumentException will be thrown. |
| 1053 | * <p>Notes: |
| 1054 | * <p>For Internet Protocol v4 the value consists of an |
| 1055 | * <code>integer</code>, the least significant 8 bits of which |
| 1056 | * represent the value of the TOS octet in IP packets sent by |
| 1057 | * the socket. |
| 1058 | * RFC 1349 defines the TOS values as follows: |
| 1059 | * <p> |
| 1060 | * <UL> |
| 1061 | * <LI><CODE>IPTOS_LOWCOST (0x02)</CODE></LI> |
| 1062 | * <LI><CODE>IPTOS_RELIABILITY (0x04)</CODE></LI> |
| 1063 | * <LI><CODE>IPTOS_THROUGHPUT (0x08)</CODE></LI> |
| 1064 | * <LI><CODE>IPTOS_LOWDELAY (0x10)</CODE></LI> |
| 1065 | * </UL> |
| 1066 | * The last low order bit is always ignored as this |
| 1067 | * corresponds to the MBZ (must be zero) bit. |
| 1068 | * <p> |
| 1069 | * Setting bits in the precedence field may result in a |
| 1070 | * SocketException indicating that the operation is not |
| 1071 | * permitted. |
| 1072 | * <p> |
| 1073 | * for Internet Protocol v6 <code>tc</code> is the value that |
| 1074 | * would be placed into the sin6_flowinfo field of the IP header. |
| 1075 | * |
| 1076 | * @param tc an <code>int</code> value for the bitset. |
| 1077 | * @throws SocketException if there is an error setting the |
| 1078 | * traffic class or type-of-service |
| 1079 | * @since 1.4 |
| 1080 | * @see #getTrafficClass |
| 1081 | */ |
| 1082 | public synchronized void setTrafficClass(int tc) throws SocketException { |
| 1083 | if (tc < 0 || tc > 255) |
| 1084 | throw new IllegalArgumentException("tc is not in range 0 -- 255"); |
| 1085 | |
| 1086 | if (isClosed()) |
| 1087 | throw new SocketException("Socket is closed"); |
| 1088 | getImpl().setOption(SocketOptions.IP_TOS, new Integer(tc)); |
| 1089 | } |
| 1090 | |
| 1091 | /** |
| 1092 | * Gets traffic class or type-of-service in the IP datagram |
| 1093 | * header for packets sent from this DatagramSocket. |
| 1094 | * <p> |
| 1095 | * As the underlying network implementation may ignore the |
| 1096 | * traffic class or type-of-service set using {@link #setTrafficClass(int)} |
| 1097 | * this method may return a different value than was previously |
| 1098 | * set using the {@link #setTrafficClass(int)} method on this |
| 1099 | * DatagramSocket. |
| 1100 | * |
| 1101 | * @return the traffic class or type-of-service already set |
| 1102 | * @throws SocketException if there is an error obtaining the |
| 1103 | * traffic class or type-of-service value. |
| 1104 | * @since 1.4 |
| 1105 | * @see #setTrafficClass(int) |
| 1106 | */ |
| 1107 | public synchronized int getTrafficClass() throws SocketException { |
| 1108 | if (isClosed()) |
| 1109 | throw new SocketException("Socket is closed"); |
| 1110 | return ((Integer)(getImpl().getOption(SocketOptions.IP_TOS))).intValue(); |
| 1111 | } |
| 1112 | |
| 1113 | /** |
| 1114 | * Closes this datagram socket. |
| 1115 | * <p> |
| 1116 | * Any thread currently blocked in {@link #receive} upon this socket |
| 1117 | * will throw a {@link SocketException}. |
| 1118 | * |
| 1119 | * <p> If this socket has an associated channel then the channel is closed |
| 1120 | * as well. |
| 1121 | * |
| 1122 | * @revised 1.4 |
| 1123 | * @spec JSR-51 |
| 1124 | */ |
| 1125 | public void close() { |
| 1126 | synchronized(closeLock) { |
| 1127 | if (isClosed()) |
| 1128 | return; |
| 1129 | impl.close(); |
| 1130 | closed = true; |
| 1131 | } |
| 1132 | } |
| 1133 | |
| 1134 | /** |
| 1135 | * Returns whether the socket is closed or not. |
| 1136 | * |
| 1137 | * @return true if the socket has been closed |
| 1138 | * @since 1.4 |
| 1139 | */ |
| 1140 | public boolean isClosed() { |
| 1141 | synchronized(closeLock) { |
| 1142 | return closed; |
| 1143 | } |
| 1144 | } |
| 1145 | |
| 1146 | /** |
| 1147 | * Returns the unique {@link java.nio.channels.DatagramChannel} object |
| 1148 | * associated with this datagram socket, if any. |
| 1149 | * |
| 1150 | * <p> A datagram socket will have a channel if, and only if, the channel |
| 1151 | * itself was created via the {@link java.nio.channels.DatagramChannel#open |
| 1152 | * DatagramChannel.open} method. |
| 1153 | * |
| 1154 | * @return the datagram channel associated with this datagram socket, |
| 1155 | * or <tt>null</tt> if this socket was not created for a channel |
| 1156 | * |
| 1157 | * @since 1.4 |
| 1158 | * @spec JSR-51 |
| 1159 | */ |
| 1160 | public DatagramChannel getChannel() { |
| 1161 | return null; |
| 1162 | } |
| 1163 | |
| 1164 | /** |
| 1165 | * User defined factory for all datagram sockets. |
| 1166 | */ |
| 1167 | static DatagramSocketImplFactory factory; |
| 1168 | |
| 1169 | /** |
| 1170 | * Sets the datagram socket implementation factory for the |
| 1171 | * application. The factory can be specified only once. |
| 1172 | * <p> |
| 1173 | * When an application creates a new datagram socket, the socket |
| 1174 | * implementation factory's <code>createDatagramSocketImpl</code> method is |
| 1175 | * called to create the actual datagram socket implementation. |
| 1176 | * <p> |
| 1177 | * Passing <code>null</code> to the method is a no-op unless the factory |
| 1178 | * was already set. |
| 1179 | * |
| 1180 | * <p>If there is a security manager, this method first calls |
| 1181 | * the security manager's <code>checkSetFactory</code> method |
| 1182 | * to ensure the operation is allowed. |
| 1183 | * This could result in a SecurityException. |
| 1184 | * |
| 1185 | * @param fac the desired factory. |
| 1186 | * @exception IOException if an I/O error occurs when setting the |
| 1187 | * datagram socket factory. |
| 1188 | * @exception SocketException if the factory is already defined. |
| 1189 | * @exception SecurityException if a security manager exists and its |
| 1190 | * <code>checkSetFactory</code> method doesn't allow the |
| 1191 | operation. |
| 1192 | * @see |
| 1193 | java.net.DatagramSocketImplFactory#createDatagramSocketImpl() |
| 1194 | * @see SecurityManager#checkSetFactory |
| 1195 | * @since 1.3 |
| 1196 | */ |
| 1197 | public static synchronized void |
| 1198 | setDatagramSocketImplFactory(DatagramSocketImplFactory fac) |
| 1199 | throws IOException |
| 1200 | { |
| 1201 | if (factory != null) { |
| 1202 | throw new SocketException("factory already defined"); |
| 1203 | } |
| 1204 | SecurityManager security = System.getSecurityManager(); |
| 1205 | if (security != null) { |
| 1206 | security.checkSetFactory(); |
| 1207 | } |
| 1208 | factory = fac; |
| 1209 | } |
| 1210 | } |