1 /*
2 * Copyright (c) 1995, 2019, 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.InputStream;
31 import java.io.OutputStream;
32
33 import java.security.AccessController;
34 import java.security.PrivilegedActionException;
35 import java.security.PrivilegedExceptionAction;
36 import java.util.Collections;
37 import java.util.HashSet;
38 import java.util.Objects;
39 import java.util.Set;
40
41 import sun.net.ConnectionResetException;
42 import sun.net.NetHooks;
43 import sun.net.PlatformSocketImpl;
44 import sun.net.ResourceManager;
45 import sun.net.ext.ExtendedSocketOptions;
46 import sun.net.util.SocketExceptions;
47
48 /**
49 * Default Socket Implementation. This implementation does
50 * not implement any security checks.
51 * Note this class should <b>NOT</b> be public.
52 *
53 * @author Steven B. Byrne
54 */
55 abstract class AbstractPlainSocketImpl extends SocketImpl implements PlatformSocketImpl {
56 /* instance variable for SO_TIMEOUT */
57 int timeout; // timeout in millisec
58 // traffic class
59 private int trafficClass;
60
61 private boolean shut_rd = false;
62 private boolean shut_wr = false;
63
64 private SocketInputStream socketInputStream = null;
65 private SocketOutputStream socketOutputStream = null;
66
67 /* number of threads using the FileDescriptor */
68 protected int fdUseCount = 0;
69
70 /* lock when increment/decrementing fdUseCount */
71 protected final Object fdLock = new Object();
72
73 /* indicates a close is pending on the file descriptor */
74 protected boolean closePending = false;
75
76 /* indicates connection reset state */
77 private volatile boolean connectionReset;
78
79 /* indicates whether impl is bound */
80 boolean isBound;
81
82 /* indicates whether impl is connected */
83 volatile boolean isConnected;
84
85 /* whether this Socket is a stream (TCP) socket or not (UDP)
86 */
87 protected boolean stream;
88
89 /* whether this is a server or not */
90 final boolean isServer;
91
92 /**
93 * Load net library into runtime.
94 */
95 static {
96 java.security.AccessController.doPrivileged(
97 new java.security.PrivilegedAction<>() {
98 public Void run() {
99 System.loadLibrary("net");
100 return null;
101 }
102 });
103 }
104
105 private static volatile boolean checkedReusePort;
106 private static volatile boolean isReusePortAvailable;
107
108 /**
109 * Tells whether SO_REUSEPORT is supported.
110 */
111 static boolean isReusePortAvailable() {
112 if (!checkedReusePort) {
113 isReusePortAvailable = isReusePortAvailable0();
114 checkedReusePort = true;
115 }
116 return isReusePortAvailable;
117 }
118
119 AbstractPlainSocketImpl(boolean isServer) {
120 this.isServer = isServer;
121 }
122
123 /**
124 * Creates a socket with a boolean that specifies whether this
125 * is a stream socket (true) or an unconnected UDP socket (false).
126 */
127 protected synchronized void create(boolean stream) throws IOException {
128 this.stream = stream;
129 if (!stream) {
130 ResourceManager.beforeUdpCreate();
131 // only create the fd after we know we will be able to create the socket
132 fd = new FileDescriptor();
133 try {
134 socketCreate(false);
135 SocketCleanable.register(fd);
136 } catch (IOException ioe) {
137 ResourceManager.afterUdpClose();
138 fd = null;
139 throw ioe;
140 }
141 } else {
142 fd = new FileDescriptor();
143 socketCreate(true);
144 SocketCleanable.register(fd);
145 }
146 }
147
148 /**
149 * Creates a socket and connects it to the specified port on
150 * the specified host.
151 * @param host the specified host
152 * @param port the specified port
153 */
154 protected void connect(String host, int port)
155 throws UnknownHostException, IOException
156 {
157 boolean connected = false;
158 try {
159 InetAddress address = InetAddress.getByName(host);
160 this.port = port;
161 this.address = address;
162
163 connectToAddress(address, port, timeout);
164 connected = true;
165 } finally {
166 if (!connected) {
167 try {
168 close();
169 } catch (IOException ioe) {
170 /* Do nothing. If connect threw an exception then
171 it will be passed up the call stack */
172 }
173 }
174 isConnected = connected;
175 }
176 }
177
178 /**
179 * Creates a socket and connects it to the specified address on
180 * the specified port.
181 * @param address the address
182 * @param port the specified port
183 */
184 protected void connect(InetAddress address, int port) throws IOException {
185 this.port = port;
186 this.address = address;
187
188 try {
189 connectToAddress(address, port, timeout);
190 isConnected = true;
191 return;
192 } catch (IOException e) {
193 // everything failed
194 close();
195 throw e;
196 }
197 }
198
199 /**
200 * Creates a socket and connects it to the specified address on
201 * the specified port.
202 * @param address the address
203 * @param timeout the timeout value in milliseconds, or zero for no timeout.
204 * @throws IOException if connection fails
205 * @throws IllegalArgumentException if address is null or is a
206 * SocketAddress subclass not supported by this socket
207 * @since 1.4
208 */
209 protected void connect(SocketAddress address, int timeout)
210 throws IOException {
211 boolean connected = false;
212 try {
213 if (address == null || !(address instanceof InetSocketAddress))
214 throw new IllegalArgumentException("unsupported address type");
215 InetSocketAddress addr = (InetSocketAddress) address;
216 if (addr.isUnresolved())
217 throw new UnknownHostException(addr.getHostName());
218 this.port = addr.getPort();
219 this.address = addr.getAddress();
220
221 connectToAddress(this.address, port, timeout);
222 connected = true;
223 } finally {
224 if (!connected) {
225 try {
226 close();
227 } catch (IOException ioe) {
228 /* Do nothing. If connect threw an exception then
229 it will be passed up the call stack */
230 }
231 }
232 isConnected = connected;
233 }
234 }
235
236 private void connectToAddress(InetAddress address, int port, int timeout) throws IOException {
237 if (address.isAnyLocalAddress()) {
238 doConnect(InetAddress.getLocalHost(), port, timeout);
239 } else {
240 doConnect(address, port, timeout);
241 }
242 }
243
244 public void setOption(int opt, Object val) throws SocketException {
245 if (isClosedOrPending()) {
246 throw new SocketException("Socket Closed");
247 }
248 boolean on = true;
249 switch (opt) {
250 /* check type safety b4 going native. These should never
251 * fail, since only java.Socket* has access to
252 * PlainSocketImpl.setOption().
253 */
254 case SO_LINGER:
255 if (val == null || (!(val instanceof Integer) && !(val instanceof Boolean)))
256 throw new SocketException("Bad parameter for option");
257 if (val instanceof Boolean) {
258 /* true only if disabling - enabling should be Integer */
259 on = false;
260 }
261 break;
262 case SO_TIMEOUT:
263 if (val == null || (!(val instanceof Integer)))
264 throw new SocketException("Bad parameter for SO_TIMEOUT");
265 int tmp = ((Integer) val).intValue();
266 if (tmp < 0)
267 throw new IllegalArgumentException("timeout < 0");
268 timeout = tmp;
269 break;
270 case IP_TOS:
271 if (val == null || !(val instanceof Integer)) {
272 throw new SocketException("bad argument for IP_TOS");
273 }
274 trafficClass = ((Integer)val).intValue();
275 break;
276 case SO_BINDADDR:
277 throw new SocketException("Cannot re-bind socket");
278 case TCP_NODELAY:
279 if (val == null || !(val instanceof Boolean))
280 throw new SocketException("bad parameter for TCP_NODELAY");
281 on = ((Boolean)val).booleanValue();
282 break;
283 case SO_SNDBUF:
284 case SO_RCVBUF:
285 if (val == null || !(val instanceof Integer) ||
286 !(((Integer)val).intValue() > 0)) {
287 throw new SocketException("bad parameter for SO_SNDBUF " +
288 "or SO_RCVBUF");
289 }
290 break;
291 case SO_KEEPALIVE:
292 if (val == null || !(val instanceof Boolean))
293 throw new SocketException("bad parameter for SO_KEEPALIVE");
294 on = ((Boolean)val).booleanValue();
295 break;
296 case SO_OOBINLINE:
297 if (val == null || !(val instanceof Boolean))
298 throw new SocketException("bad parameter for SO_OOBINLINE");
299 on = ((Boolean)val).booleanValue();
300 break;
301 case SO_REUSEADDR:
302 if (val == null || !(val instanceof Boolean))
303 throw new SocketException("bad parameter for SO_REUSEADDR");
304 on = ((Boolean)val).booleanValue();
305 break;
306 case SO_REUSEPORT:
307 if (val == null || !(val instanceof Boolean))
308 throw new SocketException("bad parameter for SO_REUSEPORT");
309 if (!supportedOptions().contains(StandardSocketOptions.SO_REUSEPORT))
310 throw new UnsupportedOperationException("unsupported option");
311 on = ((Boolean)val).booleanValue();
312 break;
313 default:
314 throw new SocketException("unrecognized TCP option: " + opt);
315 }
316 socketSetOption(opt, on, val);
317 }
318 public Object getOption(int opt) throws SocketException {
319 if (isClosedOrPending()) {
320 throw new SocketException("Socket Closed");
321 }
322 if (opt == SO_TIMEOUT) {
323 return timeout;
324 }
325 int ret = 0;
326 /*
327 * The native socketGetOption() knows about 3 options.
328 * The 32 bit value it returns will be interpreted according
329 * to what we're asking. A return of -1 means it understands
330 * the option but its turned off. It will raise a SocketException
331 * if "opt" isn't one it understands.
332 */
333
334 switch (opt) {
335 case TCP_NODELAY:
336 ret = socketGetOption(opt, null);
337 return Boolean.valueOf(ret != -1);
338 case SO_OOBINLINE:
339 ret = socketGetOption(opt, null);
340 return Boolean.valueOf(ret != -1);
341 case SO_LINGER:
342 ret = socketGetOption(opt, null);
343 return (ret == -1) ? Boolean.FALSE: (Object)(ret);
344 case SO_REUSEADDR:
345 ret = socketGetOption(opt, null);
346 return Boolean.valueOf(ret != -1);
347 case SO_BINDADDR:
348 InetAddressContainer in = new InetAddressContainer();
349 ret = socketGetOption(opt, in);
350 return in.addr;
351 case SO_SNDBUF:
352 case SO_RCVBUF:
353 ret = socketGetOption(opt, null);
354 return ret;
355 case IP_TOS:
356 try {
357 ret = socketGetOption(opt, null);
358 if (ret == -1) { // ipv6 tos
359 return trafficClass;
360 } else {
361 return ret;
362 }
363 } catch (SocketException se) {
364 // TODO - should make better effort to read TOS or TCLASS
365 return trafficClass; // ipv6 tos
366 }
367 case SO_KEEPALIVE:
368 ret = socketGetOption(opt, null);
369 return Boolean.valueOf(ret != -1);
370 case SO_REUSEPORT:
371 if (!supportedOptions().contains(StandardSocketOptions.SO_REUSEPORT)) {
372 throw new UnsupportedOperationException("unsupported option");
373 }
374 ret = socketGetOption(opt, null);
375 return Boolean.valueOf(ret != -1);
376 // should never get here
377 default:
378 return null;
379 }
380 }
381
382 static final ExtendedSocketOptions extendedOptions =
383 ExtendedSocketOptions.getInstance();
384
385 private static final Set<SocketOption<?>> clientSocketOptions = clientSocketOptions();
386 private static final Set<SocketOption<?>> serverSocketOptions = serverSocketOptions();
387
388 private static Set<SocketOption<?>> clientSocketOptions() {
389 HashSet<SocketOption<?>> options = new HashSet<>();
390 options.add(StandardSocketOptions.SO_KEEPALIVE);
391 options.add(StandardSocketOptions.SO_SNDBUF);
392 options.add(StandardSocketOptions.SO_RCVBUF);
393 options.add(StandardSocketOptions.SO_REUSEADDR);
394 options.add(StandardSocketOptions.SO_LINGER);
395 options.add(StandardSocketOptions.IP_TOS);
396 options.add(StandardSocketOptions.TCP_NODELAY);
397 if (isReusePortAvailable())
398 options.add(StandardSocketOptions.SO_REUSEPORT);
399 options.addAll(ExtendedSocketOptions.clientSocketOptions());
400 return Collections.unmodifiableSet(options);
401 }
402
403 private static Set<SocketOption<?>> serverSocketOptions() {
404 HashSet<SocketOption<?>> options = new HashSet<>();
405 options.add(StandardSocketOptions.SO_RCVBUF);
406 options.add(StandardSocketOptions.SO_REUSEADDR);
407 options.add(StandardSocketOptions.IP_TOS);
408 if (isReusePortAvailable())
409 options.add(StandardSocketOptions.SO_REUSEPORT);
410 options.addAll(ExtendedSocketOptions.serverSocketOptions());
411 return Collections.unmodifiableSet(options);
412 }
413
414 @Override
415 protected Set<SocketOption<?>> supportedOptions() {
416 if (isServer)
417 return serverSocketOptions;
418 else
419 return clientSocketOptions;
420 }
421
422 @Override
423 protected <T> void setOption(SocketOption<T> name, T value) throws IOException {
424 Objects.requireNonNull(name);
425 if (!supportedOptions().contains(name))
426 throw new UnsupportedOperationException("'" + name + "' not supported");
427
428 if (!name.type().isInstance(value))
429 throw new IllegalArgumentException("Invalid value '" + value + "'");
430
431 if (isClosedOrPending())
432 throw new SocketException("Socket closed");
433
434 if (name == StandardSocketOptions.SO_KEEPALIVE) {
435 setOption(SocketOptions.SO_KEEPALIVE, value);
436 } else if (name == StandardSocketOptions.SO_SNDBUF) {
437 if (((Integer)value).intValue() < 0)
438 throw new IllegalArgumentException("Invalid send buffer size:" + value);
439 setOption(SocketOptions.SO_SNDBUF, value);
440 } else if (name == StandardSocketOptions.SO_RCVBUF) {
441 if (((Integer)value).intValue() < 0)
442 throw new IllegalArgumentException("Invalid recv buffer size:" + value);
443 setOption(SocketOptions.SO_RCVBUF, value);
444 } else if (name == StandardSocketOptions.SO_REUSEADDR) {
445 setOption(SocketOptions.SO_REUSEADDR, value);
446 } else if (name == StandardSocketOptions.SO_REUSEPORT) {
447 setOption(SocketOptions.SO_REUSEPORT, value);
448 } else if (name == StandardSocketOptions.SO_LINGER ) {
449 setOption(SocketOptions.SO_LINGER, value);
450 } else if (name == StandardSocketOptions.IP_TOS) {
451 int i = ((Integer)value).intValue();
452 if (i < 0 || i > 255)
453 throw new IllegalArgumentException("Invalid IP_TOS value: " + value);
454 setOption(SocketOptions.IP_TOS, value);
455 } else if (name == StandardSocketOptions.TCP_NODELAY) {
456 setOption(SocketOptions.TCP_NODELAY, value);
457 } else if (extendedOptions.isOptionSupported(name)) {
458 extendedOptions.setOption(fd, name, value);
459 } else {
460 throw new AssertionError("unknown option: " + name);
461 }
462 }
463
464 @Override
465 @SuppressWarnings("unchecked")
466 protected <T> T getOption(SocketOption<T> name) throws IOException {
467 Objects.requireNonNull(name);
468 if (!supportedOptions().contains(name))
469 throw new UnsupportedOperationException("'" + name + "' not supported");
470
471 if (isClosedOrPending())
472 throw new SocketException("Socket closed");
473
474 if (name == StandardSocketOptions.SO_KEEPALIVE) {
475 return (T)getOption(SocketOptions.SO_KEEPALIVE);
476 } else if (name == StandardSocketOptions.SO_SNDBUF) {
477 return (T)getOption(SocketOptions.SO_SNDBUF);
478 } else if (name == StandardSocketOptions.SO_RCVBUF) {
479 return (T)getOption(SocketOptions.SO_RCVBUF);
480 } else if (name == StandardSocketOptions.SO_REUSEADDR) {
481 return (T)getOption(SocketOptions.SO_REUSEADDR);
482 } else if (name == StandardSocketOptions.SO_REUSEPORT) {
483 return (T)getOption(SocketOptions.SO_REUSEPORT);
484 } else if (name == StandardSocketOptions.SO_LINGER) {
485 return (T)getOption(SocketOptions.SO_LINGER);
486 } else if (name == StandardSocketOptions.IP_TOS) {
487 return (T)getOption(SocketOptions.IP_TOS);
488 } else if (name == StandardSocketOptions.TCP_NODELAY) {
489 return (T)getOption(SocketOptions.TCP_NODELAY);
490 } else if (extendedOptions.isOptionSupported(name)) {
491 return (T) extendedOptions.getOption(fd, name);
492 } else {
493 throw new AssertionError("unknown option: " + name);
494 }
495 }
496
497 /**
498 * The workhorse of the connection operation. Tries several times to
499 * establish a connection to the given <host, port>. If unsuccessful,
500 * throws an IOException indicating what went wrong.
501 */
502
503 synchronized void doConnect(InetAddress address, int port, int timeout) throws IOException {
504 synchronized (fdLock) {
505 if (!closePending && !isBound) {
506 NetHooks.beforeTcpConnect(fd, address, port);
507 }
508 }
509 try {
510 acquireFD();
511 try {
512 socketConnect(address, port, timeout);
513 /* socket may have been closed during poll/select */
514 synchronized (fdLock) {
515 if (closePending) {
516 throw new SocketException ("Socket closed");
517 }
518 }
519 } finally {
520 releaseFD();
521 }
522 } catch (IOException e) {
523 close();
524 throw SocketExceptions.of(e, new InetSocketAddress(address, port));
525 }
526 }
527
528 /**
529 * Binds the socket to the specified address of the specified local port.
530 * @param address the address
531 * @param lport the port
532 */
533 protected synchronized void bind(InetAddress address, int lport)
534 throws IOException
535 {
536 synchronized (fdLock) {
537 if (!closePending && !isBound) {
538 NetHooks.beforeTcpBind(fd, address, lport);
539 }
540 }
541 socketBind(address, lport);
542 isBound = true;
543 }
544
545 /**
546 * Listens, for a specified amount of time, for connections.
547 * @param count the amount of time to listen for connections
548 */
549 protected synchronized void listen(int count) throws IOException {
550 socketListen(count);
551 }
552
553 /**
554 * Accepts connections.
555 * @param si the socket impl
556 */
557 protected void accept(SocketImpl si) throws IOException {
558 si.fd = new FileDescriptor();
559 acquireFD();
560 try {
561 socketAccept(si);
562 } finally {
563 releaseFD();
564 }
565 SocketCleanable.register(si.fd);
566 }
567
568 /**
569 * Gets an InputStream for this socket.
570 */
571 protected synchronized InputStream getInputStream() throws IOException {
572 synchronized (fdLock) {
573 if (isClosedOrPending())
574 throw new IOException("Socket Closed");
575 if (shut_rd)
576 throw new IOException("Socket input is shutdown");
577 if (socketInputStream == null) {
578 PrivilegedExceptionAction<SocketInputStream> pa = () -> new SocketInputStream(this);
579 try {
580 socketInputStream = AccessController.doPrivileged(pa);
581 } catch (PrivilegedActionException e) {
582 throw (IOException) e.getCause();
583 }
584 }
585 }
586 return socketInputStream;
587 }
588
589 void setInputStream(SocketInputStream in) {
590 socketInputStream = in;
591 }
592
593 /**
594 * Gets an OutputStream for this socket.
595 */
596 protected synchronized OutputStream getOutputStream() throws IOException {
597 synchronized (fdLock) {
598 if (isClosedOrPending())
599 throw new IOException("Socket Closed");
600 if (shut_wr)
601 throw new IOException("Socket output is shutdown");
602 if (socketOutputStream == null) {
603 PrivilegedExceptionAction<SocketOutputStream> pa = () -> new SocketOutputStream(this);
604 try {
605 socketOutputStream = AccessController.doPrivileged(pa);
606 } catch (PrivilegedActionException e) {
607 throw (IOException) e.getCause();
608 }
609 }
610 }
611 return socketOutputStream;
612 }
613
614 void setFileDescriptor(FileDescriptor fd) {
615 this.fd = fd;
616 }
617
618 void setAddress(InetAddress address) {
619 this.address = address;
620 }
621
622 void setPort(int port) {
623 this.port = port;
624 }
625
626 void setLocalPort(int localport) {
627 this.localport = localport;
628 }
629
630 /**
631 * Returns the number of bytes that can be read without blocking.
632 */
633 protected synchronized int available() throws IOException {
634 if (isClosedOrPending()) {
635 throw new IOException("Stream closed.");
636 }
637
638 /*
639 * If connection has been reset or shut down for input, then return 0
640 * to indicate there are no buffered bytes.
641 */
642 if (isConnectionReset() || shut_rd) {
643 return 0;
644 }
645
646 /*
647 * If no bytes available and we were previously notified
648 * of a connection reset then we move to the reset state.
649 *
650 * If are notified of a connection reset then check
651 * again if there are bytes buffered on the socket.
652 */
653 int n = 0;
654 try {
655 n = socketAvailable();
656 } catch (ConnectionResetException exc1) {
657 setConnectionReset();
658 }
659 return n;
660 }
661
662 /**
663 * Closes the socket.
664 */
665 protected void close() throws IOException {
666 synchronized(fdLock) {
667 if (fd != null) {
668 if (!stream) {
669 ResourceManager.afterUdpClose();
670 }
671 if (fdUseCount == 0) {
672 if (closePending) {
673 return;
674 }
675 closePending = true;
676 /*
677 * We close the FileDescriptor in two-steps - first the
678 * "pre-close" which closes the socket but doesn't
679 * release the underlying file descriptor. This operation
680 * may be lengthy due to untransmitted data and a long
681 * linger interval. Once the pre-close is done we do the
682 * actual socket to release the fd.
683 */
684 try {
685 socketPreClose();
686 } finally {
687 socketClose();
688 }
689 fd = null;
690 return;
691 } else {
692 /*
693 * If a thread has acquired the fd and a close
694 * isn't pending then use a deferred close.
695 * Also decrement fdUseCount to signal the last
696 * thread that releases the fd to close it.
697 */
698 if (!closePending) {
699 closePending = true;
700 fdUseCount--;
701 socketPreClose();
702 }
703 }
704 }
705 }
706 }
707
708 void reset() {
709 throw new InternalError("should not get here");
710 }
711
712 /**
713 * Shutdown read-half of the socket connection;
714 */
715 protected void shutdownInput() throws IOException {
716 if (fd != null) {
717 socketShutdown(SHUT_RD);
718 if (socketInputStream != null) {
719 socketInputStream.setEOF(true);
720 }
721 shut_rd = true;
722 }
723 }
724
725 /**
726 * Shutdown write-half of the socket connection;
727 */
728 protected void shutdownOutput() throws IOException {
729 if (fd != null) {
730 socketShutdown(SHUT_WR);
731 shut_wr = true;
732 }
733 }
734
735 protected boolean supportsUrgentData () {
736 return true;
737 }
738
739 protected void sendUrgentData (int data) throws IOException {
740 if (fd == null) {
741 throw new IOException("Socket Closed");
742 }
743 socketSendUrgentData (data);
744 }
745
746 /*
747 * "Acquires" and returns the FileDescriptor for this impl
748 *
749 * A corresponding releaseFD is required to "release" the
750 * FileDescriptor.
751 */
752 FileDescriptor acquireFD() {
753 synchronized (fdLock) {
754 fdUseCount++;
755 return fd;
756 }
757 }
758
759 /*
760 * "Release" the FileDescriptor for this impl.
761 *
762 * If the use count goes to -1 then the socket is closed.
763 */
764 void releaseFD() {
765 synchronized (fdLock) {
766 fdUseCount--;
767 if (fdUseCount == -1) {
768 if (fd != null) {
769 try {
770 socketClose();
771 } catch (IOException e) {
772 } finally {
773 fd = null;
774 }
775 }
776 }
777 }
778 }
779
780 boolean isConnectionReset() {
781 return connectionReset;
782 }
783
784 void setConnectionReset() {
785 connectionReset = true;
786 }
787
788 /*
789 * Return true if already closed or close is pending
790 */
791 public boolean isClosedOrPending() {
792 /*
793 * Lock on fdLock to ensure that we wait if a
794 * close is in progress.
795 */
796 synchronized (fdLock) {
797 if (closePending || (fd == null)) {
798 return true;
799 } else {
800 return false;
801 }
802 }
803 }
804
805 /*
806 * Return the current value of SO_TIMEOUT
807 */
808 public int getTimeout() {
809 return timeout;
810 }
811
812 /*
813 * "Pre-close" a socket by dup'ing the file descriptor - this enables
814 * the socket to be closed without releasing the file descriptor.
815 */
816 private void socketPreClose() throws IOException {
817 socketClose0(true);
818 }
819
820 /*
821 * Close the socket (and release the file descriptor).
822 */
823 protected void socketClose() throws IOException {
824 SocketCleanable.unregister(fd);
825 socketClose0(false);
826 }
827
828 abstract void socketCreate(boolean stream) throws IOException;
829 abstract void socketConnect(InetAddress address, int port, int timeout)
830 throws IOException;
831 abstract void socketBind(InetAddress address, int port)
832 throws IOException;
833 abstract void socketListen(int count)
834 throws IOException;
835 abstract void socketAccept(SocketImpl s)
836 throws IOException;
837 abstract int socketAvailable()
838 throws IOException;
839 abstract void socketClose0(boolean useDeferredClose)
840 throws IOException;
841 abstract void socketShutdown(int howto)
842 throws IOException;
843 abstract void socketSetOption(int cmd, boolean on, Object value)
844 throws SocketException;
845 abstract int socketGetOption(int opt, Object iaContainerObj) throws SocketException;
846 abstract void socketSendUrgentData(int data)
847 throws IOException;
848
849 public static final int SHUT_RD = 0;
850 public static final int SHUT_WR = 1;
851
852 private static native boolean isReusePortAvailable0();
853 }