1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
|
/*
* Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.nio.ch;
import java.io.*;
import java.net.*;
import java.nio.channels.*;
import java.util.*;
import java.security.AccessController;
import java.security.PrivilegedAction;
class Net { // package-private
private Net() { }
// unspecified protocol family
static final ProtocolFamily UNSPEC = new ProtocolFamily() {
public String name() {
return "UNSPEC";
}
};
// -- Miscellaneous utilities --
private static volatile boolean checkedIPv6 = false;
private static volatile boolean isIPv6Available;
/**
* Tells whether dual-IPv4/IPv6 sockets should be used.
*/
static boolean isIPv6Available() {
if (!checkedIPv6) {
isIPv6Available = isIPv6Available0();
checkedIPv6 = true;
}
return isIPv6Available;
}
/**
* Tells whether IPv6 sockets can join IPv4 multicast groups
*/
static boolean canIPv6SocketJoinIPv4Group() {
return canIPv6SocketJoinIPv4Group0();
}
/**
* Tells whether {@link #join6} can be used to join an IPv4
* multicast group (IPv4 group as IPv4-mapped IPv6 address)
*/
static boolean canJoin6WithIPv4Group() {
return canJoin6WithIPv4Group0();
}
static InetSocketAddress checkAddress(SocketAddress sa) {
if (sa == null)
throw new NullPointerException();
if (!(sa instanceof InetSocketAddress))
throw new UnsupportedAddressTypeException(); // ## needs arg
InetSocketAddress isa = (InetSocketAddress)sa;
if (isa.isUnresolved())
throw new UnresolvedAddressException(); // ## needs arg
InetAddress addr = isa.getAddress();
if (!(addr instanceof Inet4Address || addr instanceof Inet6Address))
throw new IllegalArgumentException("Invalid address type");
return isa;
}
static InetSocketAddress asInetSocketAddress(SocketAddress sa) {
if (!(sa instanceof InetSocketAddress))
throw new UnsupportedAddressTypeException();
return (InetSocketAddress)sa;
}
static void translateToSocketException(Exception x)
throws SocketException
{
if (x instanceof SocketException)
throw (SocketException)x;
Exception nx = x;
if (x instanceof ClosedChannelException)
nx = new SocketException("Socket is closed");
else if (x instanceof NotYetConnectedException)
nx = new SocketException("Socket is not connected");
else if (x instanceof AlreadyBoundException)
nx = new SocketException("Already bound");
else if (x instanceof NotYetBoundException)
nx = new SocketException("Socket is not bound yet");
else if (x instanceof UnsupportedAddressTypeException)
nx = new SocketException("Unsupported address type");
else if (x instanceof UnresolvedAddressException) {
nx = new SocketException("Unresolved address");
}
if (nx != x)
nx.initCause(x);
if (nx instanceof SocketException)
throw (SocketException)nx;
else if (nx instanceof RuntimeException)
throw (RuntimeException)nx;
else
throw new Error("Untranslated exception", nx);
}
static void translateException(Exception x,
boolean unknownHostForUnresolved)
throws IOException
{
if (x instanceof IOException)
throw (IOException)x;
// Throw UnknownHostException from here since it cannot
// be thrown as a SocketException
if (unknownHostForUnresolved &&
(x instanceof UnresolvedAddressException))
{
throw new UnknownHostException();
}
translateToSocketException(x);
}
static void translateException(Exception x)
throws IOException
{
translateException(x, false);
}
/**
* Returns any IPv4 address of the given network interface, or
* null if the interface does not have any IPv4 addresses.
*/
static Inet4Address anyInet4Address(final NetworkInterface interf) {
return AccessController.doPrivileged(new PrivilegedAction<Inet4Address>() {
public Inet4Address run() {
Enumeration<InetAddress> addrs = interf.getInetAddresses();
while (addrs.hasMoreElements()) {
InetAddress addr = addrs.nextElement();
if (addr instanceof Inet4Address) {
return (Inet4Address)addr;
}
}
return null;
}
});
}
/**
* Returns an IPv4 address as an int.
*/
static int inet4AsInt(InetAddress ia) {
if (ia instanceof Inet4Address) {
byte[] addr = ia.getAddress();
int address = addr[3] & 0xFF;
address |= ((addr[2] << 8) & 0xFF00);
address |= ((addr[1] << 16) & 0xFF0000);
address |= ((addr[0] << 24) & 0xFF000000);
return address;
}
throw new AssertionError("Should not reach here");
}
/**
* Returns an InetAddress from the given IPv4 address
* represented as an int.
*/
static InetAddress inet4FromInt(int address) {
byte[] addr = new byte[4];
addr[0] = (byte) ((address >>> 24) & 0xFF);
addr[1] = (byte) ((address >>> 16) & 0xFF);
addr[2] = (byte) ((address >>> 8) & 0xFF);
addr[3] = (byte) (address & 0xFF);
try {
return InetAddress.getByAddress(addr);
} catch (UnknownHostException uhe) {
throw new AssertionError("Should not reach here");
}
}
/**
* Returns an IPv6 address as a byte array
*/
static byte[] inet6AsByteArray(InetAddress ia) {
if (ia instanceof Inet6Address) {
return ia.getAddress();
}
// need to construct IPv4-mapped address
if (ia instanceof Inet4Address) {
byte[] ip4address = ia.getAddress();
byte[] address = new byte[16];
address[10] = (byte)0xff;
address[11] = (byte)0xff;
address[12] = ip4address[0];
address[13] = ip4address[1];
address[14] = ip4address[2];
address[15] = ip4address[3];
return address;
}
throw new AssertionError("Should not reach here");
}
// -- Socket options
static void setSocketOption(FileDescriptor fd, ProtocolFamily family,
SocketOption<?> name, Object value)
throws IOException
{
if (value == null)
throw new IllegalArgumentException("Invalid option value");
// only simple values supported by this method
Class<?> type = name.type();
if (type != Integer.class && type != Boolean.class)
throw new AssertionError("Should not reach here");
// special handling
if (name == StandardSocketOptions.SO_RCVBUF ||
name == StandardSocketOptions.SO_SNDBUF)
{
int i = ((Integer)value).intValue();
if (i < 0)
throw new IllegalArgumentException("Invalid send/receive buffer size");
}
if (name == StandardSocketOptions.SO_LINGER) {
int i = ((Integer)value).intValue();
if (i < 0)
value = Integer.valueOf(-1);
if (i > 65535)
value = Integer.valueOf(65535);
}
if (name == StandardSocketOptions.IP_TOS) {
int i = ((Integer)value).intValue();
if (i < 0 || i > 255)
throw new IllegalArgumentException("Invalid IP_TOS value");
}
if (name == StandardSocketOptions.IP_MULTICAST_TTL) {
int i = ((Integer)value).intValue();
if (i < 0 || i > 255)
throw new IllegalArgumentException("Invalid TTL/hop value");
}
// map option name to platform level/name
OptionKey key = SocketOptionRegistry.findOption(name, family);
if (key == null)
throw new AssertionError("Option not found");
int arg;
if (type == Integer.class) {
arg = ((Integer)value).intValue();
} else {
boolean b = ((Boolean)value).booleanValue();
arg = (b) ? 1 : 0;
}
boolean mayNeedConversion = (family == UNSPEC);
setIntOption0(fd, mayNeedConversion, key.level(), key.name(), arg);
}
static Object getSocketOption(FileDescriptor fd, ProtocolFamily family,
SocketOption<?> name)
throws IOException
{
Class<?> type = name.type();
// only simple values supported by this method
if (type != Integer.class && type != Boolean.class)
throw new AssertionError("Should not reach here");
// map option name to platform level/name
OptionKey key = SocketOptionRegistry.findOption(name, family);
if (key == null)
throw new AssertionError("Option not found");
boolean mayNeedConversion = (family == UNSPEC);
int value = getIntOption0(fd, mayNeedConversion, key.level(), key.name());
if (type == Integer.class) {
return Integer.valueOf(value);
} else {
return (value == 0) ? Boolean.FALSE : Boolean.TRUE;
}
}
// -- Socket operations --
private static native boolean isIPv6Available0();
private static native boolean canIPv6SocketJoinIPv4Group0();
private static native boolean canJoin6WithIPv4Group0();
static FileDescriptor socket(boolean stream) throws IOException {
return socket(UNSPEC, stream);
}
static FileDescriptor socket(ProtocolFamily family, boolean stream)
throws IOException {
boolean preferIPv6 = isIPv6Available() &&
(family != StandardProtocolFamily.INET);
return socket0(preferIPv6, stream, false);
}
static FileDescriptor serverSocket(boolean stream) {
return socket0(isIPv6Available(), stream, true);
}
// Due to oddities SO_REUSEADDR on windows reuse is ignored
private static native FileDescriptor socket0(boolean preferIPv6, boolean stream, boolean reuse);
static void bind(FileDescriptor fd, InetAddress addr, int port)
throws IOException
{
bind(UNSPEC, fd, addr, port);
}
static void bind(ProtocolFamily family, FileDescriptor fd,
InetAddress addr, int port) throws IOException
{
boolean preferIPv6 = isIPv6Available() &&
(family != StandardProtocolFamily.INET);
bind0(preferIPv6, fd, addr, port);
}
private static native void bind0(boolean preferIPv6, FileDescriptor fd,
InetAddress addr, int port)
throws IOException;
static native void listen(FileDescriptor fd, int backlog) throws IOException;
static int connect(FileDescriptor fd, InetAddress remote, int remotePort)
throws IOException
{
return connect(UNSPEC, fd, remote, remotePort);
}
static int connect(ProtocolFamily family, FileDescriptor fd, InetAddress remote, int remotePort)
throws IOException
{
boolean preferIPv6 = isIPv6Available() &&
(family != StandardProtocolFamily.INET);
return connect0(preferIPv6, fd, remote, remotePort);
}
private static native int connect0(boolean preferIPv6,
FileDescriptor fd,
InetAddress remote,
int remotePort)
throws IOException;
public final static int SHUT_RD = 0;
public final static int SHUT_WR = 1;
public final static int SHUT_RDWR = 2;
static native void shutdown(FileDescriptor fd, int how) throws IOException;
private static native int localPort(FileDescriptor fd)
throws IOException;
private static native InetAddress localInetAddress(FileDescriptor fd)
throws IOException;
static InetSocketAddress localAddress(FileDescriptor fd)
throws IOException
{
return new InetSocketAddress(localInetAddress(fd), localPort(fd));
}
private static native int remotePort(FileDescriptor fd)
throws IOException;
private static native InetAddress remoteInetAddress(FileDescriptor fd)
throws IOException;
static InetSocketAddress remoteAddress(FileDescriptor fd)
throws IOException
{
return new InetSocketAddress(remoteInetAddress(fd), remotePort(fd));
}
private static native int getIntOption0(FileDescriptor fd, boolean mayNeedConversion,
int level, int opt)
throws IOException;
private static native void setIntOption0(FileDescriptor fd, boolean mayNeedConversion,
int level, int opt, int arg)
throws IOException;
// -- Multicast support --
/**
* Join IPv4 multicast group
*/
static int join4(FileDescriptor fd, int group, int interf, int source)
throws IOException
{
return joinOrDrop4(true, fd, group, interf, source);
}
/**
* Drop membership of IPv4 multicast group
*/
static void drop4(FileDescriptor fd, int group, int interf, int source)
throws IOException
{
joinOrDrop4(false, fd, group, interf, source);
}
private static native int joinOrDrop4(boolean join, FileDescriptor fd, int group, int interf, int source)
throws IOException;
/**
* Block IPv4 source
*/
static int block4(FileDescriptor fd, int group, int interf, int source)
throws IOException
{
return blockOrUnblock4(true, fd, group, interf, source);
}
/**
* Unblock IPv6 source
*/
static void unblock4(FileDescriptor fd, int group, int interf, int source)
throws IOException
{
blockOrUnblock4(false, fd, group, interf, source);
}
private static native int blockOrUnblock4(boolean block, FileDescriptor fd, int group,
int interf, int source)
throws IOException;
/**
* Join IPv6 multicast group
*/
static int join6(FileDescriptor fd, byte[] group, int index, byte[] source)
throws IOException
{
return joinOrDrop6(true, fd, group, index, source);
}
/**
* Drop membership of IPv6 multicast group
*/
static void drop6(FileDescriptor fd, byte[] group, int index, byte[] source)
throws IOException
{
joinOrDrop6(false, fd, group, index, source);
}
private static native int joinOrDrop6(boolean join, FileDescriptor fd, byte[] group, int index, byte[] source)
throws IOException;
/**
* Block IPv6 source
*/
static int block6(FileDescriptor fd, byte[] group, int index, byte[] source)
throws IOException
{
return blockOrUnblock6(true, fd, group, index, source);
}
/**
* Unblock IPv6 source
*/
static void unblock6(FileDescriptor fd, byte[] group, int index, byte[] source)
throws IOException
{
blockOrUnblock6(false, fd, group, index, source);
}
static native int blockOrUnblock6(boolean block, FileDescriptor fd, byte[] group, int index, byte[] source)
throws IOException;
static native void setInterface4(FileDescriptor fd, int interf) throws IOException;
static native int getInterface4(FileDescriptor fd) throws IOException;
static native void setInterface6(FileDescriptor fd, int index) throws IOException;
static native int getInterface6(FileDescriptor fd) throws IOException;
}
|