1 /*
2 * Copyright (c) 2000, 2018, 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 sun.nio.ch;
27
28 import java.io.FileDescriptor;
29 import java.io.IOException;
30 import java.net.Inet4Address;
31 import java.net.Inet6Address;
32 import java.net.InetAddress;
33 import java.net.InetSocketAddress;
34 import java.net.NetworkInterface;
35 import java.net.ProtocolFamily;
36 import java.net.SocketAddress;
37 import java.net.SocketException;
38 import java.net.SocketOption;
39 import java.net.StandardProtocolFamily;
40 import java.net.StandardSocketOptions;
41 import java.net.UnknownHostException;
42 import java.nio.channels.AlreadyBoundException;
43 import java.nio.channels.ClosedChannelException;
44 import java.nio.channels.NotYetBoundException;
45 import java.nio.channels.NotYetConnectedException;
46 import java.nio.channels.UnresolvedAddressException;
47 import java.nio.channels.UnsupportedAddressTypeException;
48 import java.security.AccessController;
49 import java.security.PrivilegedAction;
50 import java.util.Enumeration;
51
52 import sun.net.ext.ExtendedSocketOptions;
53 import sun.security.action.GetPropertyAction;
54
55 public class Net {
56
57 private Net() { }
58
59 // unspecified protocol family
60 static final ProtocolFamily UNSPEC = new ProtocolFamily() {
61 public String name() {
62 return "UNSPEC";
63 }
64 };
65
66 // set to true if exclusive binding is on for Windows
67 private static final boolean exclusiveBind;
68
69 // set to true if the fast tcp loopback should be enabled on Windows
70 private static final boolean fastLoopback;
71
72 // -- Miscellaneous utilities --
73
74 private static volatile boolean checkedIPv6;
75 private static volatile boolean isIPv6Available;
76 private static volatile boolean checkedReusePort;
77 private static volatile boolean isReusePortAvailable;
78
79 /**
80 * Tells whether dual-IPv4/IPv6 sockets should be used.
81 */
82 static boolean isIPv6Available() {
83 if (!checkedIPv6) {
84 isIPv6Available = isIPv6Available0();
85 checkedIPv6 = true;
86 }
87 return isIPv6Available;
88 }
89
90 /**
91 * Tells whether SO_REUSEPORT is supported.
92 */
93 static boolean isReusePortAvailable() {
94 if (!checkedReusePort) {
95 isReusePortAvailable = isReusePortAvailable0();
96 checkedReusePort = true;
97 }
98 return isReusePortAvailable;
99 }
100
101 /**
102 * Returns true if exclusive binding is on
103 */
104 static boolean useExclusiveBind() {
105 return exclusiveBind;
106 }
107
108 /**
109 * Tells whether IPv6 sockets can join IPv4 multicast groups
110 */
111 static boolean canIPv6SocketJoinIPv4Group() {
112 return canIPv6SocketJoinIPv4Group0();
113 }
114
115 /**
116 * Tells whether {@link #join6} can be used to join an IPv4
117 * multicast group (IPv4 group as IPv4-mapped IPv6 address)
118 */
119 static boolean canJoin6WithIPv4Group() {
120 return canJoin6WithIPv4Group0();
121 }
122
123 public static InetSocketAddress checkAddress(SocketAddress sa) {
124 if (sa == null)
125 throw new NullPointerException();
126 if (!(sa instanceof InetSocketAddress))
127 throw new UnsupportedAddressTypeException(); // ## needs arg
128 InetSocketAddress isa = (InetSocketAddress)sa;
129 if (isa.isUnresolved())
130 throw new UnresolvedAddressException(); // ## needs arg
131 InetAddress addr = isa.getAddress();
132 if (!(addr instanceof Inet4Address || addr instanceof Inet6Address))
133 throw new IllegalArgumentException("Invalid address type");
134 return isa;
135 }
136
137 static InetSocketAddress checkAddress(SocketAddress sa, ProtocolFamily family) {
138 InetSocketAddress isa = checkAddress(sa);
139 if (family == StandardProtocolFamily.INET) {
140 InetAddress addr = isa.getAddress();
141 if (!(addr instanceof Inet4Address))
142 throw new UnsupportedAddressTypeException();
143 }
144 return isa;
145 }
146
147 static InetSocketAddress asInetSocketAddress(SocketAddress sa) {
148 if (!(sa instanceof InetSocketAddress))
149 throw new UnsupportedAddressTypeException();
150 return (InetSocketAddress)sa;
151 }
152
153 static void translateToSocketException(Exception x)
154 throws SocketException
155 {
156 if (x instanceof SocketException)
157 throw (SocketException)x;
158 Exception nx = x;
159 if (x instanceof ClosedChannelException)
160 nx = new SocketException("Socket is closed");
161 else if (x instanceof NotYetConnectedException)
162 nx = new SocketException("Socket is not connected");
163 else if (x instanceof AlreadyBoundException)
164 nx = new SocketException("Already bound");
165 else if (x instanceof NotYetBoundException)
166 nx = new SocketException("Socket is not bound yet");
167 else if (x instanceof UnsupportedAddressTypeException)
168 nx = new SocketException("Unsupported address type");
169 else if (x instanceof UnresolvedAddressException) {
170 nx = new SocketException("Unresolved address");
171 }
172 if (nx != x)
173 nx.initCause(x);
174
175 if (nx instanceof SocketException)
176 throw (SocketException)nx;
177 else if (nx instanceof RuntimeException)
178 throw (RuntimeException)nx;
179 else
180 throw new Error("Untranslated exception", nx);
181 }
182
183 static void translateException(Exception x,
184 boolean unknownHostForUnresolved)
185 throws IOException
186 {
187 if (x instanceof IOException)
188 throw (IOException)x;
189 // Throw UnknownHostException from here since it cannot
190 // be thrown as a SocketException
191 if (unknownHostForUnresolved &&
192 (x instanceof UnresolvedAddressException))
193 {
194 throw new UnknownHostException();
195 }
196 translateToSocketException(x);
197 }
198
199 static void translateException(Exception x)
200 throws IOException
201 {
202 translateException(x, false);
203 }
204
205 /**
206 * Returns the local address after performing a SecurityManager#checkConnect.
207 */
208 static InetSocketAddress getRevealedLocalAddress(InetSocketAddress addr) {
209 SecurityManager sm = System.getSecurityManager();
210 if (addr == null || sm == null)
211 return addr;
212
213 try{
214 sm.checkConnect(addr.getAddress().getHostAddress(), -1);
215 // Security check passed
216 } catch (SecurityException e) {
217 // Return loopback address only if security check fails
218 addr = getLoopbackAddress(addr.getPort());
219 }
220 return addr;
221 }
222
223 static String getRevealedLocalAddressAsString(InetSocketAddress addr) {
224 return System.getSecurityManager() == null ? addr.toString() :
225 getLoopbackAddress(addr.getPort()).toString();
226 }
227
228 private static InetSocketAddress getLoopbackAddress(int port) {
229 return new InetSocketAddress(InetAddress.getLoopbackAddress(),
230 port);
231 }
232
233 /**
234 * Returns any IPv4 address of the given network interface, or
235 * null if the interface does not have any IPv4 addresses.
236 */
237 static Inet4Address anyInet4Address(final NetworkInterface interf) {
238 return AccessController.doPrivileged(new PrivilegedAction<Inet4Address>() {
239 public Inet4Address run() {
240 Enumeration<InetAddress> addrs = interf.getInetAddresses();
241 while (addrs.hasMoreElements()) {
242 InetAddress addr = addrs.nextElement();
243 if (addr instanceof Inet4Address) {
244 return (Inet4Address)addr;
245 }
246 }
247 return null;
248 }
249 });
250 }
251
252 /**
253 * Returns an IPv4 address as an int.
254 */
255 static int inet4AsInt(InetAddress ia) {
256 if (ia instanceof Inet4Address) {
257 byte[] addr = ia.getAddress();
258 int address = addr[3] & 0xFF;
259 address |= ((addr[2] << 8) & 0xFF00);
260 address |= ((addr[1] << 16) & 0xFF0000);
261 address |= ((addr[0] << 24) & 0xFF000000);
262 return address;
263 }
264 throw new AssertionError("Should not reach here");
265 }
266
267 /**
268 * Returns an InetAddress from the given IPv4 address
269 * represented as an int.
270 */
271 static InetAddress inet4FromInt(int address) {
272 byte[] addr = new byte[4];
273 addr[0] = (byte) ((address >>> 24) & 0xFF);
274 addr[1] = (byte) ((address >>> 16) & 0xFF);
275 addr[2] = (byte) ((address >>> 8) & 0xFF);
276 addr[3] = (byte) (address & 0xFF);
277 try {
278 return InetAddress.getByAddress(addr);
279 } catch (UnknownHostException uhe) {
280 throw new AssertionError("Should not reach here");
281 }
282 }
283
284 /**
285 * Returns an IPv6 address as a byte array
286 */
287 static byte[] inet6AsByteArray(InetAddress ia) {
288 if (ia instanceof Inet6Address) {
289 return ia.getAddress();
290 }
291
292 // need to construct IPv4-mapped address
293 if (ia instanceof Inet4Address) {
294 byte[] ip4address = ia.getAddress();
295 byte[] address = new byte[16];
296 address[10] = (byte)0xff;
297 address[11] = (byte)0xff;
298 address[12] = ip4address[0];
299 address[13] = ip4address[1];
300 address[14] = ip4address[2];
301 address[15] = ip4address[3];
302 return address;
303 }
304
305 throw new AssertionError("Should not reach here");
306 }
307
308 // -- Socket options
309
310 static final ExtendedSocketOptions extendedOptions =
311 ExtendedSocketOptions.getInstance();
312
313 static void setSocketOption(FileDescriptor fd, ProtocolFamily family,
314 SocketOption<?> name, Object value)
315 throws IOException
316 {
317 if (value == null)
318 throw new IllegalArgumentException("Invalid option value");
319
320 // only simple values supported by this method
321 Class<?> type = name.type();
322
323 if (extendedOptions.isOptionSupported(name)) {
324 extendedOptions.setOption(fd, name, value);
325 return;
326 }
327
328 if (type != Integer.class && type != Boolean.class)
329 throw new AssertionError("Should not reach here");
330
331 // special handling
332 if (name == StandardSocketOptions.SO_RCVBUF ||
333 name == StandardSocketOptions.SO_SNDBUF)
334 {
335 int i = ((Integer)value).intValue();
336 if (i < 0)
337 throw new IllegalArgumentException("Invalid send/receive buffer size");
338 }
339 if (name == StandardSocketOptions.SO_LINGER) {
340 int i = ((Integer)value).intValue();
341 if (i < 0)
342 value = Integer.valueOf(-1);
343 if (i > 65535)
344 value = Integer.valueOf(65535);
345 }
346 if (name == StandardSocketOptions.IP_TOS) {
347 int i = ((Integer)value).intValue();
348 if (i < 0 || i > 255)
349 throw new IllegalArgumentException("Invalid IP_TOS value");
350 }
351 if (name == StandardSocketOptions.IP_MULTICAST_TTL) {
352 int i = ((Integer)value).intValue();
353 if (i < 0 || i > 255)
354 throw new IllegalArgumentException("Invalid TTL/hop value");
355 }
356
357 // map option name to platform level/name
358 OptionKey key = SocketOptionRegistry.findOption(name, family);
359 if (key == null)
360 throw new AssertionError("Option not found");
361
362 int arg;
363 if (type == Integer.class) {
364 arg = ((Integer)value).intValue();
365 } else {
366 boolean b = ((Boolean)value).booleanValue();
367 arg = (b) ? 1 : 0;
368 }
369
370 boolean mayNeedConversion = (family == UNSPEC);
371 boolean isIPv6 = (family == StandardProtocolFamily.INET6);
372 setIntOption0(fd, mayNeedConversion, key.level(), key.name(), arg, isIPv6);
373 }
374
375 static Object getSocketOption(FileDescriptor fd, ProtocolFamily family,
376 SocketOption<?> name)
377 throws IOException
378 {
379 Class<?> type = name.type();
380
381 if (extendedOptions.isOptionSupported(name)) {
382 return extendedOptions.getOption(fd, name);
383 }
384
385 // only simple values supported by this method
386 if (type != Integer.class && type != Boolean.class)
387 throw new AssertionError("Should not reach here");
388
389 // map option name to platform level/name
390 OptionKey key = SocketOptionRegistry.findOption(name, family);
391 if (key == null)
392 throw new AssertionError("Option not found");
393
394 boolean mayNeedConversion = (family == UNSPEC);
395 int value = getIntOption0(fd, mayNeedConversion, key.level(), key.name());
396
397 if (type == Integer.class) {
398 return Integer.valueOf(value);
399 } else {
400 return (value == 0) ? Boolean.FALSE : Boolean.TRUE;
401 }
402 }
403
404 public static boolean isFastTcpLoopbackRequested() {
405 String loopbackProp = GetPropertyAction
406 .privilegedGetProperty("jdk.net.useFastTcpLoopback", "false");
407 return loopbackProp.isEmpty() ? true : Boolean.parseBoolean(loopbackProp);
408 }
409
410 // -- Socket operations --
411
412 private static native boolean isIPv6Available0();
413
414 private static native boolean isReusePortAvailable0();
415
416 /*
417 * Returns 1 for Windows and -1 for Solaris/Linux/Mac OS
418 */
419 private static native int isExclusiveBindAvailable();
420
421 private static native boolean canIPv6SocketJoinIPv4Group0();
422
423 private static native boolean canJoin6WithIPv4Group0();
424
425 static FileDescriptor socket(boolean stream) throws IOException {
426 return socket(UNSPEC, stream);
427 }
428
429 static FileDescriptor socket(ProtocolFamily family, boolean stream)
430 throws IOException {
431 boolean preferIPv6 = isIPv6Available() &&
432 (family != StandardProtocolFamily.INET);
433 return IOUtil.newFD(socket0(preferIPv6, stream, false, fastLoopback));
434 }
435
436 static FileDescriptor serverSocket(boolean stream) {
437 return IOUtil.newFD(socket0(isIPv6Available(), stream, true, fastLoopback));
438 }
439
440 // Due to oddities SO_REUSEADDR on windows reuse is ignored
441 private static native int socket0(boolean preferIPv6, boolean stream, boolean reuse,
442 boolean fastLoopback);
443
444 public static void bind(FileDescriptor fd, InetAddress addr, int port)
445 throws IOException
446 {
447 bind(UNSPEC, fd, addr, port);
448 }
449
450 static void bind(ProtocolFamily family, FileDescriptor fd,
451 InetAddress addr, int port) throws IOException
452 {
453 boolean preferIPv6 = isIPv6Available() &&
454 (family != StandardProtocolFamily.INET);
455 bind0(fd, preferIPv6, exclusiveBind, addr, port);
456 }
457
458 private static native void bind0(FileDescriptor fd, boolean preferIPv6,
459 boolean useExclBind, InetAddress addr,
460 int port)
461 throws IOException;
462
463 static native void listen(FileDescriptor fd, int backlog) throws IOException;
464
465 static int connect(FileDescriptor fd, InetAddress remote, int remotePort)
466 throws IOException
467 {
468 return connect(UNSPEC, fd, remote, remotePort);
469 }
470
471 static int connect(ProtocolFamily family, FileDescriptor fd, InetAddress remote, int remotePort)
472 throws IOException
473 {
474 boolean preferIPv6 = isIPv6Available() &&
475 (family != StandardProtocolFamily.INET);
476 return connect0(preferIPv6, fd, remote, remotePort);
477 }
478
479 private static native int connect0(boolean preferIPv6,
480 FileDescriptor fd,
481 InetAddress remote,
482 int remotePort)
483 throws IOException;
484
485
486 public static final int SHUT_RD = 0;
487 public static final int SHUT_WR = 1;
488 public static final int SHUT_RDWR = 2;
489
490 static native void shutdown(FileDescriptor fd, int how) throws IOException;
491
492 private static native int localPort(FileDescriptor fd)
493 throws IOException;
494
495 private static native InetAddress localInetAddress(FileDescriptor fd)
496 throws IOException;
497
498 public static InetSocketAddress localAddress(FileDescriptor fd)
499 throws IOException
500 {
501 return new InetSocketAddress(localInetAddress(fd), localPort(fd));
502 }
503
504 private static native int remotePort(FileDescriptor fd)
505 throws IOException;
506
507 private static native InetAddress remoteInetAddress(FileDescriptor fd)
508 throws IOException;
509
510 static InetSocketAddress remoteAddress(FileDescriptor fd)
511 throws IOException
512 {
513 return new InetSocketAddress(remoteInetAddress(fd), remotePort(fd));
514 }
515
516 private static native int getIntOption0(FileDescriptor fd, boolean mayNeedConversion,
517 int level, int opt)
518 throws IOException;
519
520 private static native void setIntOption0(FileDescriptor fd, boolean mayNeedConversion,
521 int level, int opt, int arg, boolean isIPv6)
522 throws IOException;
523
524 static native int poll(FileDescriptor fd, int events, long timeout)
525 throws IOException;
526
527 // -- Multicast support --
528
529
530 /**
531 * Join IPv4 multicast group
532 */
533 static int join4(FileDescriptor fd, int group, int interf, int source)
534 throws IOException
535 {
536 return joinOrDrop4(true, fd, group, interf, source);
537 }
538
539 /**
540 * Drop membership of IPv4 multicast group
541 */
542 static void drop4(FileDescriptor fd, int group, int interf, int source)
543 throws IOException
544 {
545 joinOrDrop4(false, fd, group, interf, source);
546 }
547
548 private static native int joinOrDrop4(boolean join, FileDescriptor fd, int group, int interf, int source)
549 throws IOException;
550
551 /**
552 * Block IPv4 source
553 */
554 static int block4(FileDescriptor fd, int group, int interf, int source)
555 throws IOException
556 {
557 return blockOrUnblock4(true, fd, group, interf, source);
558 }
559
560 /**
561 * Unblock IPv6 source
562 */
563 static void unblock4(FileDescriptor fd, int group, int interf, int source)
564 throws IOException
565 {
566 blockOrUnblock4(false, fd, group, interf, source);
567 }
568
569 private static native int blockOrUnblock4(boolean block, FileDescriptor fd, int group,
570 int interf, int source)
571 throws IOException;
572
573 /**
574 * Join IPv6 multicast group
575 */
576 static int join6(FileDescriptor fd, byte[] group, int index, byte[] source)
577 throws IOException
578 {
579 return joinOrDrop6(true, fd, group, index, source);
580 }
581
582 /**
583 * Drop membership of IPv6 multicast group
584 */
585 static void drop6(FileDescriptor fd, byte[] group, int index, byte[] source)
586 throws IOException
587 {
588 joinOrDrop6(false, fd, group, index, source);
589 }
590
591 private static native int joinOrDrop6(boolean join, FileDescriptor fd, byte[] group, int index, byte[] source)
592 throws IOException;
593
594 /**
595 * Block IPv6 source
596 */
597 static int block6(FileDescriptor fd, byte[] group, int index, byte[] source)
598 throws IOException
599 {
600 return blockOrUnblock6(true, fd, group, index, source);
601 }
602
603 /**
604 * Unblock IPv6 source
605 */
606 static void unblock6(FileDescriptor fd, byte[] group, int index, byte[] source)
607 throws IOException
608 {
609 blockOrUnblock6(false, fd, group, index, source);
610 }
611
612 static native int blockOrUnblock6(boolean block, FileDescriptor fd, byte[] group, int index, byte[] source)
613 throws IOException;
614
615 static native void setInterface4(FileDescriptor fd, int interf) throws IOException;
616
617 static native int getInterface4(FileDescriptor fd) throws IOException;
618
619 static native void setInterface6(FileDescriptor fd, int index) throws IOException;
620
621 static native int getInterface6(FileDescriptor fd) throws IOException;
622
623 private static native void initIDs();
624
625 /**
626 * Event masks for the various poll system calls.
627 * They will be set platform dependent in the static initializer below.
628 */
629 public static final short POLLIN;
630 public static final short POLLOUT;
631 public static final short POLLERR;
632 public static final short POLLHUP;
633 public static final short POLLNVAL;
634 public static final short POLLCONN;
635
636 static native short pollinValue();
637 static native short polloutValue();
638 static native short pollerrValue();
639 static native short pollhupValue();
640 static native short pollnvalValue();
641 static native short pollconnValue();
642
643 static {
644 IOUtil.load();
645 initIDs();
646
647 POLLIN = pollinValue();
648 POLLOUT = polloutValue();
649 POLLERR = pollerrValue();
650 POLLHUP = pollhupValue();
651 POLLNVAL = pollnvalValue();
652 POLLCONN = pollconnValue();
653 }
654
655 static {
656 int availLevel = isExclusiveBindAvailable();
657 if (availLevel >= 0) {
658 String exclBindProp = GetPropertyAction
659 .privilegedGetProperty("sun.net.useExclusiveBind");
660 if (exclBindProp != null) {
661 exclusiveBind = exclBindProp.isEmpty() ?
662 true : Boolean.parseBoolean(exclBindProp);
663 } else if (availLevel == 1) {
664 exclusiveBind = true;
665 } else {
666 exclusiveBind = false;
667 }
668 } else {
669 exclusiveBind = false;
670 }
671
672 fastLoopback = isFastTcpLoopbackRequested();
673 }
674 }