1 /*
2 * Copyright (c) 1997, 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 #include "net_util.h"
26
27 #include "java_net_InetAddress.h"
28 #include "java_net_SocketOptions.h"
29
30 // Taken from mstcpip.h in Windows SDK 8.0 or newer.
31 #define SIO_LOOPBACK_FAST_PATH _WSAIOW(IOC_VENDOR,16)
32
33 #ifndef IPTOS_TOS_MASK
34 #define IPTOS_TOS_MASK 0x1e
35 #endif
36 #ifndef IPTOS_PREC_MASK
37 #define IPTOS_PREC_MASK 0xe0
38 #endif
39
40 /* true if SO_RCVTIMEO is supported */
41 jboolean isRcvTimeoutSupported = JNI_TRUE;
42
43 /*
44 * Table of Windows Sockets errors, the specific exception we
45 * throw for the error, and the error text.
46 *
47 * Note that this table excludes OS dependent errors.
48 *
49 * Latest list of Windows Sockets errors can be found at :-
50 * http://msdn.microsoft.com/library/psdk/winsock/errors_3wc2.htm
51 */
52 static struct {
53 int errCode;
54 const char *exc;
55 const char *errString;
56 } const winsock_errors[] = {
57 { WSAEACCES, 0, "Permission denied" },
58 { WSAEADDRINUSE, "BindException", "Address already in use" },
59 { WSAEADDRNOTAVAIL, "BindException", "Cannot assign requested address" },
60 { WSAEAFNOSUPPORT, 0, "Address family not supported by protocol family" },
61 { WSAEALREADY, 0, "Operation already in progress" },
62 { WSAECONNABORTED, 0, "Software caused connection abort" },
63 { WSAECONNREFUSED, "ConnectException", "Connection refused" },
64 { WSAECONNRESET, 0, "Connection reset by peer" },
65 { WSAEDESTADDRREQ, 0, "Destination address required" },
66 { WSAEFAULT, 0, "Bad address" },
67 { WSAEHOSTDOWN, 0, "Host is down" },
68 { WSAEHOSTUNREACH, "NoRouteToHostException", "No route to host" },
69 { WSAEINPROGRESS, 0, "Operation now in progress" },
70 { WSAEINTR, 0, "Interrupted function call" },
71 { WSAEINVAL, 0, "Invalid argument" },
72 { WSAEISCONN, 0, "Socket is already connected" },
73 { WSAEMFILE, 0, "Too many open files" },
74 { WSAEMSGSIZE, 0, "The message is larger than the maximum supported by the underlying transport" },
75 { WSAENETDOWN, 0, "Network is down" },
76 { WSAENETRESET, 0, "Network dropped connection on reset" },
77 { WSAENETUNREACH, 0, "Network is unreachable" },
78 { WSAENOBUFS, 0, "No buffer space available (maximum connections reached?)" },
79 { WSAENOPROTOOPT, 0, "Bad protocol option" },
80 { WSAENOTCONN, 0, "Socket is not connected" },
81 { WSAENOTSOCK, 0, "Socket operation on nonsocket" },
82 { WSAEOPNOTSUPP, 0, "Operation not supported" },
83 { WSAEPFNOSUPPORT, 0, "Protocol family not supported" },
84 { WSAEPROCLIM, 0, "Too many processes" },
85 { WSAEPROTONOSUPPORT, 0, "Protocol not supported" },
86 { WSAEPROTOTYPE, 0, "Protocol wrong type for socket" },
87 { WSAESHUTDOWN, 0, "Cannot send after socket shutdown" },
88 { WSAESOCKTNOSUPPORT, 0, "Socket type not supported" },
89 { WSAETIMEDOUT, "ConnectException", "Connection timed out" },
90 { WSATYPE_NOT_FOUND, 0, "Class type not found" },
91 { WSAEWOULDBLOCK, 0, "Resource temporarily unavailable" },
92 { WSAHOST_NOT_FOUND, 0, "Host not found" },
93 { WSA_NOT_ENOUGH_MEMORY, 0, "Insufficient memory available" },
94 { WSANOTINITIALISED, 0, "Successful WSAStartup not yet performed" },
95 { WSANO_DATA, 0, "Valid name, no data record of requested type" },
96 { WSANO_RECOVERY, 0, "This is a nonrecoverable error" },
97 { WSASYSNOTREADY, 0, "Network subsystem is unavailable" },
98 { WSATRY_AGAIN, 0, "Nonauthoritative host not found" },
99 { WSAVERNOTSUPPORTED, 0, "Winsock.dll version out of range" },
100 { WSAEDISCON, 0, "Graceful shutdown in progress" },
101 { WSA_OPERATION_ABORTED, 0, "Overlapped operation aborted" },
102 };
103
104 /*
105 * Initialize Windows Sockets API support
106 */
107 BOOL WINAPI
108 DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved)
109 {
110 WSADATA wsadata;
111
112 switch (reason) {
113 case DLL_PROCESS_ATTACH:
114 if (WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
115 return FALSE;
116 }
117 break;
118
119 case DLL_PROCESS_DETACH:
120 WSACleanup();
121 break;
122
123 default:
124 break;
125 }
126 return TRUE;
127 }
128
129 void platformInit() {}
130 void parseExclusiveBindProperty(JNIEnv *env) {}
131
132 /*
133 * Since winsock doesn't have the equivalent of strerror(errno)
134 * use table to lookup error text for the error.
135 */
136 JNIEXPORT void JNICALL
137 NET_ThrowNew(JNIEnv *env, int errorNum, char *msg)
138 {
139 int i;
140 int table_size = sizeof(winsock_errors) /
141 sizeof(winsock_errors[0]);
142 char exc[256];
143 char fullMsg[256];
144 char *excP = NULL;
145
146 /*
147 * If exception already throw then don't overwrite it.
148 */
149 if ((*env)->ExceptionOccurred(env)) {
150 return;
151 }
152
153 /*
154 * Default message text if not provided
155 */
156 if (!msg) {
157 msg = "no further information";
158 }
159
160 /*
161 * Check table for known winsock errors
162 */
163 i=0;
164 while (i < table_size) {
165 if (errorNum == winsock_errors[i].errCode) {
166 break;
167 }
168 i++;
169 }
170
171 /*
172 * If found get pick the specific exception and error
173 * message corresponding to this error.
174 */
175 if (i < table_size) {
176 excP = (char *)winsock_errors[i].exc;
177 jio_snprintf(fullMsg, sizeof(fullMsg), "%s: %s",
178 (char *)winsock_errors[i].errString, msg);
179 } else {
180 jio_snprintf(fullMsg, sizeof(fullMsg),
181 "Unrecognized Windows Sockets error: %d: %s",
182 errorNum, msg);
183
184 }
185
186 /*
187 * Throw SocketException if no specific exception for this
188 * error.
189 */
190 if (excP == NULL) {
191 excP = "SocketException";
192 }
193 sprintf(exc, "%s%s", JNU_JAVANETPKG, excP);
194 JNU_ThrowByName(env, exc, fullMsg);
195 }
196
197 void
198 NET_ThrowCurrent(JNIEnv *env, char *msg)
199 {
200 NET_ThrowNew(env, WSAGetLastError(), msg);
201 }
202
203 void
204 NET_ThrowByNameWithLastError(JNIEnv *env, const char *name,
205 const char *defaultDetail) {
206 JNU_ThrowByNameWithMessageAndLastError(env, name, defaultDetail);
207 }
208
209 jfieldID
210 NET_GetFileDescriptorID(JNIEnv *env)
211 {
212 jclass cls = (*env)->FindClass(env, "java/io/FileDescriptor");
213 CHECK_NULL_RETURN(cls, NULL);
214 return (*env)->GetFieldID(env, cls, "fd", "I");
215 }
216
217 jint IPv4_supported()
218 {
219 /* TODO: properly check for IPv4 support on Windows */
220 return JNI_TRUE;
221 }
222
223 jint IPv6_supported()
224 {
225 SOCKET s = socket(AF_INET6, SOCK_STREAM, 0) ;
226 if (s == INVALID_SOCKET) {
227 return JNI_FALSE;
228 }
229 closesocket(s);
230
231 return JNI_TRUE;
232 }
233
234 jint reuseport_supported()
235 {
236 /* SO_REUSEPORT is not supported on Windows */
237 return JNI_FALSE;
238 }
239
240 /* call NET_MapSocketOptionV6 for the IPv6 fd only
241 * and NET_MapSocketOption for the IPv4 fd
242 */
243 JNIEXPORT int JNICALL
244 NET_MapSocketOptionV6(jint cmd, int *level, int *optname) {
245
246 switch (cmd) {
247 case java_net_SocketOptions_IP_MULTICAST_IF:
248 case java_net_SocketOptions_IP_MULTICAST_IF2:
249 *level = IPPROTO_IPV6;
250 *optname = IPV6_MULTICAST_IF;
251 return 0;
252
253 case java_net_SocketOptions_IP_MULTICAST_LOOP:
254 *level = IPPROTO_IPV6;
255 *optname = IPV6_MULTICAST_LOOP;
256 return 0;
257 }
258 return NET_MapSocketOption (cmd, level, optname);
259 }
260
261 /*
262 * Map the Java level socket option to the platform specific
263 * level and option name.
264 */
265
266 JNIEXPORT int JNICALL
267 NET_MapSocketOption(jint cmd, int *level, int *optname) {
268
269 typedef struct {
270 jint cmd;
271 int level;
272 int optname;
273 } sockopts;
274
275 static sockopts opts[] = {
276 { java_net_SocketOptions_TCP_NODELAY, IPPROTO_TCP, TCP_NODELAY },
277 { java_net_SocketOptions_SO_OOBINLINE, SOL_SOCKET, SO_OOBINLINE },
278 { java_net_SocketOptions_SO_LINGER, SOL_SOCKET, SO_LINGER },
279 { java_net_SocketOptions_SO_SNDBUF, SOL_SOCKET, SO_SNDBUF },
280 { java_net_SocketOptions_SO_RCVBUF, SOL_SOCKET, SO_RCVBUF },
281 { java_net_SocketOptions_SO_KEEPALIVE, SOL_SOCKET, SO_KEEPALIVE },
282 { java_net_SocketOptions_SO_REUSEADDR, SOL_SOCKET, SO_REUSEADDR },
283 { java_net_SocketOptions_SO_BROADCAST, SOL_SOCKET, SO_BROADCAST },
284 { java_net_SocketOptions_IP_MULTICAST_IF, IPPROTO_IP, IP_MULTICAST_IF },
285 { java_net_SocketOptions_IP_MULTICAST_LOOP, IPPROTO_IP, IP_MULTICAST_LOOP },
286 { java_net_SocketOptions_IP_TOS, IPPROTO_IP, IP_TOS },
287
288 };
289
290
291 int i;
292
293 /*
294 * Map the Java level option to the native level
295 */
296 for (i=0; i<(int)(sizeof(opts) / sizeof(opts[0])); i++) {
297 if (cmd == opts[i].cmd) {
298 *level = opts[i].level;
299 *optname = opts[i].optname;
300 return 0;
301 }
302 }
303
304 /* not found */
305 return -1;
306 }
307
308
309 /*
310 * Wrapper for setsockopt dealing with Windows specific issues :-
311 *
312 * IP_TOS and IP_MULTICAST_LOOP can't be set on some Windows
313 * editions.
314 *
315 * The value for the type-of-service (TOS) needs to be masked
316 * to get consistent behaviour with other operating systems.
317 */
318 JNIEXPORT int JNICALL
319 NET_SetSockOpt(int s, int level, int optname, const void *optval,
320 int optlen)
321 {
322 int rv = 0;
323 int parg = 0;
324 int plen = sizeof(parg);
325
326 if (level == IPPROTO_IP && optname == IP_TOS) {
327 int *tos = (int *)optval;
328 *tos &= (IPTOS_TOS_MASK | IPTOS_PREC_MASK);
329 }
330
331 if (optname == SO_REUSEADDR) {
332 /*
333 * Do not set SO_REUSEADDE if SO_EXCLUSIVEADDUSE is already set
334 */
335 rv = NET_GetSockOpt(s, SOL_SOCKET, SO_EXCLUSIVEADDRUSE, (char *)&parg, &plen);
336 if (rv == 0 && parg == 1) {
337 return rv;
338 }
339 }
340
341 rv = setsockopt(s, level, optname, optval, optlen);
342
343 if (rv == SOCKET_ERROR) {
344 /*
345 * IP_TOS & IP_MULTICAST_LOOP can't be set on some versions
346 * of Windows.
347 */
348 if ((WSAGetLastError() == WSAENOPROTOOPT) &&
349 (level == IPPROTO_IP) &&
350 (optname == IP_TOS || optname == IP_MULTICAST_LOOP)) {
351 rv = 0;
352 }
353
354 /*
355 * IP_TOS can't be set on unbound UDP sockets.
356 */
357 if ((WSAGetLastError() == WSAEINVAL) &&
358 (level == IPPROTO_IP) &&
359 (optname == IP_TOS)) {
360 rv = 0;
361 }
362 }
363
364 return rv;
365 }
366
367 /*
368 * Wrapper for setsockopt dealing with Windows specific issues :-
369 *
370 * IP_TOS is not supported on some versions of Windows so
371 * instead return the default value for the OS.
372 */
373 JNIEXPORT int JNICALL
374 NET_GetSockOpt(int s, int level, int optname, void *optval,
375 int *optlen)
376 {
377 int rv;
378
379 if (level == IPPROTO_IPV6 && optname == IPV6_TCLASS) {
380 int *intopt = (int *)optval;
381 *intopt = 0;
382 *optlen = sizeof(*intopt);
383 return 0;
384 }
385
386 rv = getsockopt(s, level, optname, optval, optlen);
387
388
389 /*
390 * IPPROTO_IP/IP_TOS is not supported on some Windows
391 * editions so return the default type-of-service
392 * value.
393 */
394 if (rv == SOCKET_ERROR) {
395
396 if (WSAGetLastError() == WSAENOPROTOOPT &&
397 level == IPPROTO_IP && optname == IP_TOS) {
398
399 *((int *)optval) = 0;
400 rv = 0;
401 }
402 }
403
404 return rv;
405 }
406
407 JNIEXPORT int JNICALL
408 NET_SocketAvailable(int s, int *pbytes) {
409 u_long arg;
410 if (ioctlsocket((SOCKET)s, FIONREAD, &arg) == SOCKET_ERROR) {
411 return -1;
412 } else {
413 *pbytes = (int) arg;
414 return 0;
415 }
416 }
417
418 /*
419 * Sets SO_ECLUSIVEADDRUSE if SO_REUSEADDR is not already set.
420 */
421 void setExclusiveBind(int fd) {
422 int parg = 0;
423 int plen = sizeof(parg);
424 int rv = 0;
425 rv = NET_GetSockOpt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&parg, &plen);
426 if (rv == 0 && parg == 0) {
427 parg = 1;
428 rv = NET_SetSockOpt(fd, SOL_SOCKET, SO_EXCLUSIVEADDRUSE, (char*)&parg, plen);
429 }
430 }
431
432 /*
433 * Wrapper for bind winsock call - transparent converts an
434 * error related to binding to a port that has exclusive access
435 * into an error indicating the port is in use (facilitates
436 * better error reporting).
437 *
438 * Should be only called by the wrapper method NET_WinBind
439 */
440 JNIEXPORT int JNICALL
441 NET_Bind(int s, SOCKETADDRESS *sa, int len)
442 {
443 int rv = 0;
444 rv = bind(s, &sa->sa, len);
445
446 if (rv == SOCKET_ERROR) {
447 /*
448 * If bind fails with WSAEACCES it means that a privileged
449 * process has done an exclusive bind (NT SP4/2000/XP only).
450 */
451 if (WSAGetLastError() == WSAEACCES) {
452 WSASetLastError(WSAEADDRINUSE);
453 }
454 }
455
456 return rv;
457 }
458
459 /*
460 * Wrapper for NET_Bind call. Sets SO_EXCLUSIVEADDRUSE
461 * if required, and then calls NET_BIND
462 */
463 JNIEXPORT int JNICALL
464 NET_WinBind(int s, SOCKETADDRESS *sa, int len, jboolean exclBind)
465 {
466 if (exclBind == JNI_TRUE)
467 setExclusiveBind(s);
468 return NET_Bind(s, sa, len);
469 }
470
471 JNIEXPORT int JNICALL
472 NET_SocketClose(int fd) {
473 struct linger l = {0, 0};
474 int ret = 0;
475 int len = sizeof (l);
476 if (getsockopt(fd, SOL_SOCKET, SO_LINGER, (char *)&l, &len) == 0) {
477 if (l.l_onoff == 0) {
478 shutdown(fd, SD_SEND);
479 }
480 }
481 ret = closesocket (fd);
482 return ret;
483 }
484
485 JNIEXPORT int JNICALL
486 NET_Timeout(int fd, long timeout) {
487 int ret;
488 fd_set tbl;
489 struct timeval t;
490 t.tv_sec = timeout / 1000;
491 t.tv_usec = (timeout % 1000) * 1000;
492 FD_ZERO(&tbl);
493 FD_SET(fd, &tbl);
494 ret = select (fd + 1, &tbl, 0, 0, &t);
495 return ret;
496 }
497
498
499 /*
500 * differs from NET_Timeout() as follows:
501 *
502 * If timeout = -1, it blocks forever.
503 *
504 * returns 1 or 2 depending if only one or both sockets
505 * fire at same time.
506 *
507 * *fdret is (one of) the active fds. If both sockets
508 * fire at same time, *fdret = fd always.
509 */
510 JNIEXPORT int JNICALL
511 NET_Timeout2(int fd, int fd1, long timeout, int *fdret) {
512 int ret;
513 fd_set tbl;
514 struct timeval t, *tP = &t;
515 if (timeout == -1) {
516 tP = 0;
517 } else {
518 t.tv_sec = timeout / 1000;
519 t.tv_usec = (timeout % 1000) * 1000;
520 }
521 FD_ZERO(&tbl);
522 FD_SET(fd, &tbl);
523 FD_SET(fd1, &tbl);
524 ret = select (0, &tbl, 0, 0, tP);
525 switch (ret) {
526 case 0:
527 return 0; /* timeout */
528 case 1:
529 if (FD_ISSET (fd, &tbl)) {
530 *fdret= fd;
531 } else {
532 *fdret= fd1;
533 }
534 return 1;
535 case 2:
536 *fdret= fd;
537 return 2;
538 }
539 return -1;
540 }
541
542
543 void dumpAddr (char *str, void *addr) {
544 struct sockaddr_in6 *a = (struct sockaddr_in6 *)addr;
545 int family = a->sin6_family;
546 printf ("%s\n", str);
547 if (family == AF_INET) {
548 struct sockaddr_in *him = (struct sockaddr_in *)addr;
549 printf ("AF_INET: port %d: %x\n", ntohs(him->sin_port),
550 ntohl(him->sin_addr.s_addr));
551 } else {
552 int i;
553 struct in6_addr *in = &a->sin6_addr;
554 printf ("AF_INET6 ");
555 printf ("port %d ", ntohs (a->sin6_port));
556 printf ("flow %d ", a->sin6_flowinfo);
557 printf ("addr ");
558 for (i=0; i<7; i++) {
559 printf ("%04x:", ntohs(in->s6_words[i]));
560 }
561 printf ("%04x", ntohs(in->s6_words[7]));
562 printf (" scope %d\n", a->sin6_scope_id);
563 }
564 }
565
566 /* Macro, which cleans-up the iv6bind structure,
567 * closes the two sockets (if open),
568 * and returns SOCKET_ERROR. Used in NET_BindV6 only.
569 */
570
571 #define CLOSE_SOCKETS_AND_RETURN do { \
572 if (fd != -1) { \
573 closesocket (fd); \
574 fd = -1; \
575 } \
576 if (ofd != -1) { \
577 closesocket (ofd); \
578 ofd = -1; \
579 } \
580 if (close_fd != -1) { \
581 closesocket (close_fd); \
582 close_fd = -1; \
583 } \
584 if (close_ofd != -1) { \
585 closesocket (close_ofd); \
586 close_ofd = -1; \
587 } \
588 b->ipv4_fd = b->ipv6_fd = -1; \
589 return SOCKET_ERROR; \
590 } while(0)
591
592 /*
593 * if ipv6 is available, call NET_BindV6 to bind to the required address/port.
594 * Because the same port number may need to be reserved in both v4 and v6 space,
595 * this may require socket(s) to be re-opened. Therefore, all of this information
596 * is passed in and returned through the ipv6bind structure.
597 *
598 * If the request is to bind to a specific address, then this (by definition) means
599 * only bind in either v4 or v6, and this is just the same as normal. ie. a single
600 * call to bind() will suffice. The other socket is closed in this case.
601 *
602 * The more complicated case is when the requested address is ::0 or 0.0.0.0.
603 *
604 * Two further cases:
605 * 2. If the requested port is 0 (ie. any port) then we try to bind in v4 space
606 * first with a wild-card port argument. We then try to bind in v6 space
607 * using the returned port number. If this fails, we repeat the process
608 * until a free port common to both spaces becomes available.
609 *
610 * 3. If the requested port is a specific port, then we just try to get that
611 * port in both spaces, and if it is not free in both, then the bind fails.
612 *
613 * On failure, sockets are closed and an error returned with CLOSE_SOCKETS_AND_RETURN
614 */
615
616 JNIEXPORT int JNICALL
617 NET_BindV6(struct ipv6bind *b, jboolean exclBind) {
618 int fd=-1, ofd=-1, rv, len;
619 /* need to defer close until new sockets created */
620 int close_fd=-1, close_ofd=-1;
621 SOCKETADDRESS oaddr; /* other address to bind */
622 int family = b->addr->sa.sa_family;
623 int ofamily;
624 u_short port; /* requested port parameter */
625 u_short bound_port;
626
627 if (family == AF_INET && (b->addr->sa4.sin_addr.s_addr != INADDR_ANY)) {
628 /* bind to v4 only */
629 int ret;
630 ret = NET_WinBind((int)b->ipv4_fd, b->addr,
631 sizeof(SOCKETADDRESS), exclBind);
632 if (ret == SOCKET_ERROR) {
633 CLOSE_SOCKETS_AND_RETURN;
634 }
635 closesocket (b->ipv6_fd);
636 b->ipv6_fd = -1;
637 return 0;
638 }
639 if (family == AF_INET6 && (!IN6_IS_ADDR_ANY(&b->addr->sa6.sin6_addr))) {
640 /* bind to v6 only */
641 int ret;
642 ret = NET_WinBind((int)b->ipv6_fd, b->addr,
643 sizeof(SOCKETADDRESS), exclBind);
644 if (ret == SOCKET_ERROR) {
645 CLOSE_SOCKETS_AND_RETURN;
646 }
647 closesocket (b->ipv4_fd);
648 b->ipv4_fd = -1;
649 return 0;
650 }
651
652 /* We need to bind on both stacks, with the same port number */
653
654 memset (&oaddr, 0, sizeof(oaddr));
655 if (family == AF_INET) {
656 ofamily = AF_INET6;
657 fd = (int)b->ipv4_fd;
658 ofd = (int)b->ipv6_fd;
659 port = (u_short)GET_PORT (b->addr);
660 IN6ADDR_SETANY(&oaddr.sa6);
661 oaddr.sa6.sin6_port = port;
662 } else {
663 ofamily = AF_INET;
664 ofd = (int)b->ipv4_fd;
665 fd = (int)b->ipv6_fd;
666 port = (u_short)GET_PORT (b->addr);
667 oaddr.sa4.sin_family = AF_INET;
668 oaddr.sa4.sin_port = port;
669 oaddr.sa4.sin_addr.s_addr = INADDR_ANY;
670 }
671
672 rv = NET_WinBind(fd, b->addr, sizeof(SOCKETADDRESS), exclBind);
673 if (rv == SOCKET_ERROR) {
674 CLOSE_SOCKETS_AND_RETURN;
675 }
676
677 /* get the port and set it in the other address */
678 len = sizeof(SOCKETADDRESS);
679 if (getsockname(fd, (struct sockaddr *)b->addr, &len) == -1) {
680 CLOSE_SOCKETS_AND_RETURN;
681 }
682 bound_port = GET_PORT (b->addr);
683 SET_PORT (&oaddr, bound_port);
684 if ((rv = NET_WinBind(ofd, &oaddr,
685 sizeof(SOCKETADDRESS), exclBind)) == SOCKET_ERROR) {
686 int retries;
687 int sotype, arglen=sizeof(sotype);
688
689 /* no retries unless, the request was for any free port */
690
691 if (port != 0) {
692 CLOSE_SOCKETS_AND_RETURN;
693 }
694
695 getsockopt(fd, SOL_SOCKET, SO_TYPE, (void *)&sotype, &arglen);
696
697 #define SOCK_RETRIES 50
698 /* 50 is an arbitrary limit, just to ensure that this
699 * cannot be an endless loop. Would expect socket creation to
700 * succeed sooner.
701 */
702 for (retries = 0; retries < SOCK_RETRIES; retries ++) {
703 int len;
704 close_fd = fd; fd = -1;
705 close_ofd = ofd; ofd = -1;
706 b->ipv4_fd = SOCKET_ERROR;
707 b->ipv6_fd = SOCKET_ERROR;
708
709 /* create two new sockets */
710 fd = (int)socket (family, sotype, 0);
711 if (fd == SOCKET_ERROR) {
712 CLOSE_SOCKETS_AND_RETURN;
713 }
714 ofd = (int)socket (ofamily, sotype, 0);
715 if (ofd == SOCKET_ERROR) {
716 CLOSE_SOCKETS_AND_RETURN;
717 }
718
719 /* bind random port on first socket */
720 SET_PORT (&oaddr, 0);
721 rv = NET_WinBind(ofd, &oaddr, sizeof(SOCKETADDRESS), exclBind);
722 if (rv == SOCKET_ERROR) {
723 CLOSE_SOCKETS_AND_RETURN;
724 }
725 /* close the original pair of sockets before continuing */
726 closesocket (close_fd);
727 closesocket (close_ofd);
728 close_fd = close_ofd = -1;
729
730 /* bind new port on second socket */
731 len = sizeof(SOCKETADDRESS);
732 if (getsockname(ofd, &oaddr.sa, &len) == -1) {
733 CLOSE_SOCKETS_AND_RETURN;
734 }
735 bound_port = GET_PORT (&oaddr);
736 SET_PORT (b->addr, bound_port);
737 rv = NET_WinBind(fd, b->addr, sizeof(SOCKETADDRESS), exclBind);
738
739 if (rv != SOCKET_ERROR) {
740 if (family == AF_INET) {
741 b->ipv4_fd = fd;
742 b->ipv6_fd = ofd;
743 } else {
744 b->ipv4_fd = ofd;
745 b->ipv6_fd = fd;
746 }
747 return 0;
748 }
749 }
750 CLOSE_SOCKETS_AND_RETURN;
751 }
752 return 0;
753 }
754
755 /**
756 * Enables SIO_LOOPBACK_FAST_PATH
757 */
758 JNIEXPORT jint JNICALL
759 NET_EnableFastTcpLoopback(int fd) {
760 int enabled = 1;
761 DWORD result_byte_count = -1;
762 int result = WSAIoctl(fd,
763 SIO_LOOPBACK_FAST_PATH,
764 &enabled,
765 sizeof(enabled),
766 NULL,
767 0,
768 &result_byte_count,
769 NULL,
770 NULL);
771 return result == SOCKET_ERROR ? WSAGetLastError() : 0;
772 }
773
774 /**
775 * See net_util.h for documentation
776 */
777 JNIEXPORT int JNICALL
778 NET_InetAddressToSockaddr(JNIEnv *env, jobject iaObj, int port,
779 SOCKETADDRESS *sa, int *len,
780 jboolean v4MappedAddress)
781 {
782 jint family = getInetAddress_family(env, iaObj);
783 JNU_CHECK_EXCEPTION_RETURN(env, -1);
784 memset((char *)sa, 0, sizeof(SOCKETADDRESS));
785
786 if (ipv6_available() &&
787 !(family == java_net_InetAddress_IPv4 &&
788 v4MappedAddress == JNI_FALSE))
789 {
790 jbyte caddr[16];
791 jint address;
792 unsigned int scopeid = 0;
793
794 if (family == java_net_InetAddress_IPv4) {
795 // convert to IPv4-mapped address
796 memset((char *)caddr, 0, 16);
797 address = getInetAddress_addr(env, iaObj);
798 JNU_CHECK_EXCEPTION_RETURN(env, -1);
799 if (address == INADDR_ANY) {
800 /* we would always prefer IPv6 wildcard address
801 * caddr[10] = 0xff;
802 * caddr[11] = 0xff; */
803 } else {
804 caddr[10] = 0xff;
805 caddr[11] = 0xff;
806 caddr[12] = ((address >> 24) & 0xff);
807 caddr[13] = ((address >> 16) & 0xff);
808 caddr[14] = ((address >> 8) & 0xff);
809 caddr[15] = (address & 0xff);
810 }
811 } else {
812 getInet6Address_ipaddress(env, iaObj, (char *)caddr);
813 scopeid = getInet6Address_scopeid(env, iaObj);
814 }
815 sa->sa6.sin6_port = (u_short)htons((u_short)port);
816 memcpy((void *)&sa->sa6.sin6_addr, caddr, sizeof(struct in6_addr));
817 sa->sa6.sin6_family = AF_INET6;
818 sa->sa6.sin6_scope_id = scopeid;
819 if (len != NULL) {
820 *len = sizeof(struct sockaddr_in6);
821 }
822 } else {
823 jint address;
824 if (family != java_net_InetAddress_IPv4) {
825 JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException", "Protocol family unavailable");
826 return -1;
827 }
828 address = getInetAddress_addr(env, iaObj);
829 JNU_CHECK_EXCEPTION_RETURN(env, -1);
830 sa->sa4.sin_port = htons((short)port);
831 sa->sa4.sin_addr.s_addr = (u_long)htonl(address);
832 sa->sa4.sin_family = AF_INET;
833 if (len != NULL) {
834 *len = sizeof(struct sockaddr_in);
835 }
836 }
837 return 0;
838 }
839
840 int
841 NET_IsIPv4Mapped(jbyte* caddr) {
842 int i;
843 for (i = 0; i < 10; i++) {
844 if (caddr[i] != 0x00) {
845 return 0; /* false */
846 }
847 }
848
849 if (((caddr[10] & 0xff) == 0xff) && ((caddr[11] & 0xff) == 0xff)) {
850 return 1; /* true */
851 }
852 return 0; /* false */
853 }
854
855 int
856 NET_IPv4MappedToIPv4(jbyte* caddr) {
857 return ((caddr[12] & 0xff) << 24) | ((caddr[13] & 0xff) << 16) | ((caddr[14] & 0xff) << 8)
858 | (caddr[15] & 0xff);
859 }
860
861 int
862 NET_IsEqual(jbyte* caddr1, jbyte* caddr2) {
863 int i;
864 for (i = 0; i < 16; i++) {
865 if (caddr1[i] != caddr2[i]) {
866 return 0; /* false */
867 }
868 }
869 return 1;
870 }
871
872 /**
873 * Wrapper for select/poll with timeout on a single file descriptor.
874 *
875 * flags (defined in net_util_md.h can be any combination of
876 * NET_WAIT_READ, NET_WAIT_WRITE & NET_WAIT_CONNECT.
877 *
878 * The function will return when either the socket is ready for one
879 * of the specified operation or the timeout expired.
880 *
881 * It returns the time left from the timeout, or -1 if it expired.
882 */
883
884 jint
885 NET_Wait(JNIEnv *env, jint fd, jint flags, jint timeout)
886 {
887 jlong prevTime = JVM_CurrentTimeMillis(env, 0);
888 jint read_rv;
889
890 while (1) {
891 jlong newTime;
892 fd_set rd, wr, ex;
893 struct timeval t;
894
895 t.tv_sec = timeout / 1000;
896 t.tv_usec = (timeout % 1000) * 1000;
897
898 FD_ZERO(&rd);
899 FD_ZERO(&wr);
900 FD_ZERO(&ex);
901 if (flags & NET_WAIT_READ) {
902 FD_SET(fd, &rd);
903 }
904 if (flags & NET_WAIT_WRITE) {
905 FD_SET(fd, &wr);
906 }
907 if (flags & NET_WAIT_CONNECT) {
908 FD_SET(fd, &wr);
909 FD_SET(fd, &ex);
910 }
911
912 errno = 0;
913 read_rv = select(fd+1, &rd, &wr, &ex, &t);
914
915 newTime = JVM_CurrentTimeMillis(env, 0);
916 timeout -= (jint)(newTime - prevTime);
917 if (timeout <= 0) {
918 return read_rv > 0 ? 0 : -1;
919 }
920 newTime = prevTime;
921
922 if (read_rv > 0) {
923 break;
924 }
925
926
927 } /* while */
928
929 return timeout;
930 }
931
932 int NET_Socket (int domain, int type, int protocol) {
933 SOCKET sock;
934 sock = socket (domain, type, protocol);
935 if (sock != INVALID_SOCKET) {
936 SetHandleInformation((HANDLE)(uintptr_t)sock, HANDLE_FLAG_INHERIT, FALSE);
937 }
938 return (int)sock;
939 }