1 /*
2 * Copyright (c) 1997, 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 #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 IPv6_supported()
218 {
219 SOCKET s = socket(AF_INET6, SOCK_STREAM, 0) ;
220 if (s == INVALID_SOCKET) {
221 return JNI_FALSE;
222 }
223 closesocket(s);
224
225 return JNI_TRUE;
226 }
227
228 jint reuseport_supported()
229 {
230 /* SO_REUSEPORT is not supported on Windows */
231 return JNI_FALSE;
232 }
233
234 /* call NET_MapSocketOptionV6 for the IPv6 fd only
235 * and NET_MapSocketOption for the IPv4 fd
236 */
237 JNIEXPORT int JNICALL
238 NET_MapSocketOptionV6(jint cmd, int *level, int *optname) {
239
240 switch (cmd) {
241 case java_net_SocketOptions_IP_MULTICAST_IF:
242 case java_net_SocketOptions_IP_MULTICAST_IF2:
243 *level = IPPROTO_IPV6;
244 *optname = IPV6_MULTICAST_IF;
245 return 0;
246
247 case java_net_SocketOptions_IP_MULTICAST_LOOP:
248 *level = IPPROTO_IPV6;
249 *optname = IPV6_MULTICAST_LOOP;
250 return 0;
251 }
252 return NET_MapSocketOption (cmd, level, optname);
253 }
254
255 /*
256 * Map the Java level socket option to the platform specific
257 * level and option name.
258 */
259
260 JNIEXPORT int JNICALL
261 NET_MapSocketOption(jint cmd, int *level, int *optname) {
262
263 typedef struct {
264 jint cmd;
265 int level;
266 int optname;
267 } sockopts;
268
269 static sockopts opts[] = {
270 { java_net_SocketOptions_TCP_NODELAY, IPPROTO_TCP, TCP_NODELAY },
271 { java_net_SocketOptions_SO_OOBINLINE, SOL_SOCKET, SO_OOBINLINE },
272 { java_net_SocketOptions_SO_LINGER, SOL_SOCKET, SO_LINGER },
273 { java_net_SocketOptions_SO_SNDBUF, SOL_SOCKET, SO_SNDBUF },
274 { java_net_SocketOptions_SO_RCVBUF, SOL_SOCKET, SO_RCVBUF },
275 { java_net_SocketOptions_SO_KEEPALIVE, SOL_SOCKET, SO_KEEPALIVE },
276 { java_net_SocketOptions_SO_REUSEADDR, SOL_SOCKET, SO_REUSEADDR },
277 { java_net_SocketOptions_SO_BROADCAST, SOL_SOCKET, SO_BROADCAST },
278 { java_net_SocketOptions_IP_MULTICAST_IF, IPPROTO_IP, IP_MULTICAST_IF },
279 { java_net_SocketOptions_IP_MULTICAST_LOOP, IPPROTO_IP, IP_MULTICAST_LOOP },
280 { java_net_SocketOptions_IP_TOS, IPPROTO_IP, IP_TOS },
281
282 };
283
284
285 int i;
286
287 /*
288 * Map the Java level option to the native level
289 */
290 for (i=0; i<(int)(sizeof(opts) / sizeof(opts[0])); i++) {
291 if (cmd == opts[i].cmd) {
292 *level = opts[i].level;
293 *optname = opts[i].optname;
294 return 0;
295 }
296 }
297
298 /* not found */
299 return -1;
300 }
301
302
303 /*
304 * Wrapper for setsockopt dealing with Windows specific issues :-
305 *
306 * IP_TOS and IP_MULTICAST_LOOP can't be set on some Windows
307 * editions.
308 *
309 * The value for the type-of-service (TOS) needs to be masked
310 * to get consistent behaviour with other operating systems.
311 */
312 JNIEXPORT int JNICALL
313 NET_SetSockOpt(int s, int level, int optname, const void *optval,
314 int optlen)
315 {
316 int rv = 0;
317 int parg = 0;
318 int plen = sizeof(parg);
319
320 if (level == IPPROTO_IP && optname == IP_TOS) {
321 int *tos = (int *)optval;
322 *tos &= (IPTOS_TOS_MASK | IPTOS_PREC_MASK);
323 }
324
325 if (optname == SO_REUSEADDR) {
326 /*
327 * Do not set SO_REUSEADDE if SO_EXCLUSIVEADDUSE is already set
328 */
329 rv = NET_GetSockOpt(s, SOL_SOCKET, SO_EXCLUSIVEADDRUSE, (char *)&parg, &plen);
330 if (rv == 0 && parg == 1) {
331 return rv;
332 }
333 }
334
335 rv = setsockopt(s, level, optname, optval, optlen);
336
337 if (rv == SOCKET_ERROR) {
338 /*
339 * IP_TOS & IP_MULTICAST_LOOP can't be set on some versions
340 * of Windows.
341 */
342 if ((WSAGetLastError() == WSAENOPROTOOPT) &&
343 (level == IPPROTO_IP) &&
344 (optname == IP_TOS || optname == IP_MULTICAST_LOOP)) {
345 rv = 0;
346 }
347
348 /*
349 * IP_TOS can't be set on unbound UDP sockets.
350 */
351 if ((WSAGetLastError() == WSAEINVAL) &&
352 (level == IPPROTO_IP) &&
353 (optname == IP_TOS)) {
354 rv = 0;
355 }
356 }
357
358 return rv;
359 }
360
361 /*
362 * Wrapper for setsockopt dealing with Windows specific issues :-
363 *
364 * IP_TOS is not supported on some versions of Windows so
365 * instead return the default value for the OS.
366 */
367 JNIEXPORT int JNICALL
368 NET_GetSockOpt(int s, int level, int optname, void *optval,
369 int *optlen)
370 {
371 int rv;
372
373 if (level == IPPROTO_IPV6 && optname == IPV6_TCLASS) {
374 int *intopt = (int *)optval;
375 *intopt = 0;
376 *optlen = sizeof(*intopt);
377 return 0;
378 }
379
380 rv = getsockopt(s, level, optname, optval, optlen);
381
382
383 /*
384 * IPPROTO_IP/IP_TOS is not supported on some Windows
385 * editions so return the default type-of-service
386 * value.
387 */
388 if (rv == SOCKET_ERROR) {
389
390 if (WSAGetLastError() == WSAENOPROTOOPT &&
391 level == IPPROTO_IP && optname == IP_TOS) {
392
393 *((int *)optval) = 0;
394 rv = 0;
395 }
396 }
397
398 return rv;
399 }
400
401 /*
402 * Sets SO_ECLUSIVEADDRUSE if SO_REUSEADDR is not already set.
403 */
404 void setExclusiveBind(int fd) {
405 int parg = 0;
406 int plen = sizeof(parg);
407 int rv = 0;
408 rv = NET_GetSockOpt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&parg, &plen);
409 if (rv == 0 && parg == 0) {
410 parg = 1;
411 rv = NET_SetSockOpt(fd, SOL_SOCKET, SO_EXCLUSIVEADDRUSE, (char*)&parg, plen);
412 }
413 }
414
415 /*
416 * Wrapper for bind winsock call - transparent converts an
417 * error related to binding to a port that has exclusive access
418 * into an error indicating the port is in use (facilitates
419 * better error reporting).
420 *
421 * Should be only called by the wrapper method NET_WinBind
422 */
423 JNIEXPORT int JNICALL
424 NET_Bind(int s, SOCKETADDRESS *sa, int len)
425 {
426 int rv = 0;
427 rv = bind(s, &sa->sa, len);
428
429 if (rv == SOCKET_ERROR) {
430 /*
431 * If bind fails with WSAEACCES it means that a privileged
432 * process has done an exclusive bind (NT SP4/2000/XP only).
433 */
434 if (WSAGetLastError() == WSAEACCES) {
435 WSASetLastError(WSAEADDRINUSE);
436 }
437 }
438
439 return rv;
440 }
441
442 /*
443 * Wrapper for NET_Bind call. Sets SO_EXCLUSIVEADDRUSE
444 * if required, and then calls NET_BIND
445 */
446 JNIEXPORT int JNICALL
447 NET_WinBind(int s, SOCKETADDRESS *sa, int len, jboolean exclBind)
448 {
449 if (exclBind == JNI_TRUE)
450 setExclusiveBind(s);
451 return NET_Bind(s, sa, len);
452 }
453
454 JNIEXPORT int JNICALL
455 NET_SocketClose(int fd) {
456 struct linger l = {0, 0};
457 int ret = 0;
458 int len = sizeof (l);
459 if (getsockopt(fd, SOL_SOCKET, SO_LINGER, (char *)&l, &len) == 0) {
460 if (l.l_onoff == 0) {
461 shutdown(fd, SD_SEND);
462 }
463 }
464 ret = closesocket (fd);
465 return ret;
466 }
467
468 JNIEXPORT int JNICALL
469 NET_Timeout(int fd, long timeout) {
470 int ret;
471 fd_set tbl;
472 struct timeval t;
473 t.tv_sec = timeout / 1000;
474 t.tv_usec = (timeout % 1000) * 1000;
475 FD_ZERO(&tbl);
476 FD_SET(fd, &tbl);
477 ret = select (fd + 1, &tbl, 0, 0, &t);
478 return ret;
479 }
480
481
482 /*
483 * differs from NET_Timeout() as follows:
484 *
485 * If timeout = -1, it blocks forever.
486 *
487 * returns 1 or 2 depending if only one or both sockets
488 * fire at same time.
489 *
490 * *fdret is (one of) the active fds. If both sockets
491 * fire at same time, *fdret = fd always.
492 */
493 JNIEXPORT int JNICALL
494 NET_Timeout2(int fd, int fd1, long timeout, int *fdret) {
495 int ret;
496 fd_set tbl;
497 struct timeval t, *tP = &t;
498 if (timeout == -1) {
499 tP = 0;
500 } else {
501 t.tv_sec = timeout / 1000;
502 t.tv_usec = (timeout % 1000) * 1000;
503 }
504 FD_ZERO(&tbl);
505 FD_SET(fd, &tbl);
506 FD_SET(fd1, &tbl);
507 ret = select (0, &tbl, 0, 0, tP);
508 switch (ret) {
509 case 0:
510 return 0; /* timeout */
511 case 1:
512 if (FD_ISSET (fd, &tbl)) {
513 *fdret= fd;
514 } else {
515 *fdret= fd1;
516 }
517 return 1;
518 case 2:
519 *fdret= fd;
520 return 2;
521 }
522 return -1;
523 }
524
525
526 void dumpAddr (char *str, void *addr) {
527 struct sockaddr_in6 *a = (struct sockaddr_in6 *)addr;
528 int family = a->sin6_family;
529 printf ("%s\n", str);
530 if (family == AF_INET) {
531 struct sockaddr_in *him = (struct sockaddr_in *)addr;
532 printf ("AF_INET: port %d: %x\n", ntohs(him->sin_port),
533 ntohl(him->sin_addr.s_addr));
534 } else {
535 int i;
536 struct in6_addr *in = &a->sin6_addr;
537 printf ("AF_INET6 ");
538 printf ("port %d ", ntohs (a->sin6_port));
539 printf ("flow %d ", a->sin6_flowinfo);
540 printf ("addr ");
541 for (i=0; i<7; i++) {
542 printf ("%04x:", ntohs(in->s6_words[i]));
543 }
544 printf ("%04x", ntohs(in->s6_words[7]));
545 printf (" scope %d\n", a->sin6_scope_id);
546 }
547 }
548
549 /* Macro, which cleans-up the iv6bind structure,
550 * closes the two sockets (if open),
551 * and returns SOCKET_ERROR. Used in NET_BindV6 only.
552 */
553
554 #define CLOSE_SOCKETS_AND_RETURN do { \
555 if (fd != -1) { \
556 closesocket (fd); \
557 fd = -1; \
558 } \
559 if (ofd != -1) { \
560 closesocket (ofd); \
561 ofd = -1; \
562 } \
563 if (close_fd != -1) { \
564 closesocket (close_fd); \
565 close_fd = -1; \
566 } \
567 if (close_ofd != -1) { \
568 closesocket (close_ofd); \
569 close_ofd = -1; \
570 } \
571 b->ipv4_fd = b->ipv6_fd = -1; \
572 return SOCKET_ERROR; \
573 } while(0)
574
575 /*
576 * if ipv6 is available, call NET_BindV6 to bind to the required address/port.
577 * Because the same port number may need to be reserved in both v4 and v6 space,
578 * this may require socket(s) to be re-opened. Therefore, all of this information
579 * is passed in and returned through the ipv6bind structure.
580 *
581 * If the request is to bind to a specific address, then this (by definition) means
582 * only bind in either v4 or v6, and this is just the same as normal. ie. a single
583 * call to bind() will suffice. The other socket is closed in this case.
584 *
585 * The more complicated case is when the requested address is ::0 or 0.0.0.0.
586 *
587 * Two further cases:
588 * 2. If the requested port is 0 (ie. any port) then we try to bind in v4 space
589 * first with a wild-card port argument. We then try to bind in v6 space
590 * using the returned port number. If this fails, we repeat the process
591 * until a free port common to both spaces becomes available.
592 *
593 * 3. If the requested port is a specific port, then we just try to get that
594 * port in both spaces, and if it is not free in both, then the bind fails.
595 *
596 * On failure, sockets are closed and an error returned with CLOSE_SOCKETS_AND_RETURN
597 */
598
599 JNIEXPORT int JNICALL
600 NET_BindV6(struct ipv6bind *b, jboolean exclBind) {
601 int fd=-1, ofd=-1, rv, len;
602 /* need to defer close until new sockets created */
603 int close_fd=-1, close_ofd=-1;
604 SOCKETADDRESS oaddr; /* other address to bind */
605 int family = b->addr->sa.sa_family;
606 int ofamily;
607 u_short port; /* requested port parameter */
608 u_short bound_port;
609
610 if (family == AF_INET && (b->addr->sa4.sin_addr.s_addr != INADDR_ANY)) {
611 /* bind to v4 only */
612 int ret;
613 ret = NET_WinBind((int)b->ipv4_fd, b->addr,
614 sizeof(SOCKETADDRESS), exclBind);
615 if (ret == SOCKET_ERROR) {
616 CLOSE_SOCKETS_AND_RETURN;
617 }
618 closesocket (b->ipv6_fd);
619 b->ipv6_fd = -1;
620 return 0;
621 }
622 if (family == AF_INET6 && (!IN6_IS_ADDR_ANY(&b->addr->sa6.sin6_addr))) {
623 /* bind to v6 only */
624 int ret;
625 ret = NET_WinBind((int)b->ipv6_fd, b->addr,
626 sizeof(SOCKETADDRESS), exclBind);
627 if (ret == SOCKET_ERROR) {
628 CLOSE_SOCKETS_AND_RETURN;
629 }
630 closesocket (b->ipv4_fd);
631 b->ipv4_fd = -1;
632 return 0;
633 }
634
635 /* We need to bind on both stacks, with the same port number */
636
637 memset (&oaddr, 0, sizeof(oaddr));
638 if (family == AF_INET) {
639 ofamily = AF_INET6;
640 fd = (int)b->ipv4_fd;
641 ofd = (int)b->ipv6_fd;
642 port = (u_short)GET_PORT (b->addr);
643 IN6ADDR_SETANY(&oaddr.sa6);
644 oaddr.sa6.sin6_port = port;
645 } else {
646 ofamily = AF_INET;
647 ofd = (int)b->ipv4_fd;
648 fd = (int)b->ipv6_fd;
649 port = (u_short)GET_PORT (b->addr);
650 oaddr.sa4.sin_family = AF_INET;
651 oaddr.sa4.sin_port = port;
652 oaddr.sa4.sin_addr.s_addr = INADDR_ANY;
653 }
654
655 rv = NET_WinBind(fd, b->addr, sizeof(SOCKETADDRESS), exclBind);
656 if (rv == SOCKET_ERROR) {
657 CLOSE_SOCKETS_AND_RETURN;
658 }
659
660 /* get the port and set it in the other address */
661 len = sizeof(SOCKETADDRESS);
662 if (getsockname(fd, (struct sockaddr *)b->addr, &len) == -1) {
663 CLOSE_SOCKETS_AND_RETURN;
664 }
665 bound_port = GET_PORT (b->addr);
666 SET_PORT (&oaddr, bound_port);
667 if ((rv = NET_WinBind(ofd, &oaddr,
668 sizeof(SOCKETADDRESS), exclBind)) == SOCKET_ERROR) {
669 int retries;
670 int sotype, arglen=sizeof(sotype);
671
672 /* no retries unless, the request was for any free port */
673
674 if (port != 0) {
675 CLOSE_SOCKETS_AND_RETURN;
676 }
677
678 getsockopt(fd, SOL_SOCKET, SO_TYPE, (void *)&sotype, &arglen);
679
680 #define SOCK_RETRIES 50
681 /* 50 is an arbitrary limit, just to ensure that this
682 * cannot be an endless loop. Would expect socket creation to
683 * succeed sooner.
684 */
685 for (retries = 0; retries < SOCK_RETRIES; retries ++) {
686 int len;
687 close_fd = fd; fd = -1;
688 close_ofd = ofd; ofd = -1;
689 b->ipv4_fd = SOCKET_ERROR;
690 b->ipv6_fd = SOCKET_ERROR;
691
692 /* create two new sockets */
693 fd = (int)socket (family, sotype, 0);
694 if (fd == SOCKET_ERROR) {
695 CLOSE_SOCKETS_AND_RETURN;
696 }
697 ofd = (int)socket (ofamily, sotype, 0);
698 if (ofd == SOCKET_ERROR) {
699 CLOSE_SOCKETS_AND_RETURN;
700 }
701
702 /* bind random port on first socket */
703 SET_PORT (&oaddr, 0);
704 rv = NET_WinBind(ofd, &oaddr, sizeof(SOCKETADDRESS), exclBind);
705 if (rv == SOCKET_ERROR) {
706 CLOSE_SOCKETS_AND_RETURN;
707 }
708 /* close the original pair of sockets before continuing */
709 closesocket (close_fd);
710 closesocket (close_ofd);
711 close_fd = close_ofd = -1;
712
713 /* bind new port on second socket */
714 len = sizeof(SOCKETADDRESS);
715 if (getsockname(ofd, &oaddr.sa, &len) == -1) {
716 CLOSE_SOCKETS_AND_RETURN;
717 }
718 bound_port = GET_PORT (&oaddr);
719 SET_PORT (b->addr, bound_port);
720 rv = NET_WinBind(fd, b->addr, sizeof(SOCKETADDRESS), exclBind);
721
722 if (rv != SOCKET_ERROR) {
723 if (family == AF_INET) {
724 b->ipv4_fd = fd;
725 b->ipv6_fd = ofd;
726 } else {
727 b->ipv4_fd = ofd;
728 b->ipv6_fd = fd;
729 }
730 return 0;
731 }
732 }
733 CLOSE_SOCKETS_AND_RETURN;
734 }
735 return 0;
736 }
737
738 /*
739 * Determine the default interface for an IPv6 address.
740 *
741 * Returns :-
742 * 0 if error
743 * > 0 interface index to use
744 */
745 jint getDefaultIPv6Interface(JNIEnv *env, struct sockaddr_in6 *target_addr)
746 {
747 int ret;
748 DWORD b;
749 struct sockaddr_in6 route;
750 SOCKET fd = socket(AF_INET6, SOCK_STREAM, 0);
751 if (fd == INVALID_SOCKET) {
752 return 0;
753 }
754
755 ret = WSAIoctl(fd, SIO_ROUTING_INTERFACE_QUERY,
756 (void *)target_addr, sizeof(struct sockaddr_in6),
757 (void *)&route, sizeof(struct sockaddr_in6),
758 &b, 0, 0);
759 if (ret == SOCKET_ERROR) {
760 // error
761 closesocket(fd);
762 return 0;
763 } else {
764 closesocket(fd);
765 return route.sin6_scope_id;
766 }
767 }
768
769 /**
770 * Enables SIO_LOOPBACK_FAST_PATH
771 */
772 JNIEXPORT jint JNICALL
773 NET_EnableFastTcpLoopback(int fd) {
774 int enabled = 1;
775 DWORD result_byte_count = -1;
776 int result = WSAIoctl(fd,
777 SIO_LOOPBACK_FAST_PATH,
778 &enabled,
779 sizeof(enabled),
780 NULL,
781 0,
782 &result_byte_count,
783 NULL,
784 NULL);
785 return result == SOCKET_ERROR ? WSAGetLastError() : 0;
786 }
787
788 /**
789 * See net_util.h for documentation
790 */
791 JNIEXPORT int JNICALL
792 NET_InetAddressToSockaddr(JNIEnv *env, jobject iaObj, int port,
793 SOCKETADDRESS *sa, int *len,
794 jboolean v4MappedAddress)
795 {
796 jint family = getInetAddress_family(env, iaObj);
797 JNU_CHECK_EXCEPTION_RETURN(env, -1);
798 memset((char *)sa, 0, sizeof(SOCKETADDRESS));
799
800 if (ipv6_available() &&
801 !(family == java_net_InetAddress_IPv4 &&
802 v4MappedAddress == JNI_FALSE))
803 {
804 jbyte caddr[16];
805 jint address;
806 unsigned int scopeid = 0, cached_scope_id = 0;
807
808 if (family == java_net_InetAddress_IPv4) {
809 // convert to IPv4-mapped address
810 memset((char *)caddr, 0, 16);
811 address = getInetAddress_addr(env, iaObj);
812 JNU_CHECK_EXCEPTION_RETURN(env, -1);
813 if (address == INADDR_ANY) {
814 /* we would always prefer IPv6 wildcard address
815 * caddr[10] = 0xff;
816 * caddr[11] = 0xff; */
817 } else {
818 caddr[10] = 0xff;
819 caddr[11] = 0xff;
820 caddr[12] = ((address >> 24) & 0xff);
821 caddr[13] = ((address >> 16) & 0xff);
822 caddr[14] = ((address >> 8) & 0xff);
823 caddr[15] = (address & 0xff);
824 }
825 } else {
826 getInet6Address_ipaddress(env, iaObj, (char *)caddr);
827 scopeid = getInet6Address_scopeid(env, iaObj);
828 cached_scope_id = (unsigned int)(*env)->GetIntField(env, iaObj, ia6_cachedscopeidID);
829 }
830 sa->sa6.sin6_port = (u_short)htons((u_short)port);
831 memcpy((void *)&sa->sa6.sin6_addr, caddr, sizeof(struct in6_addr));
832 sa->sa6.sin6_family = AF_INET6;
833 if ((family == java_net_InetAddress_IPv6) &&
834 IN6_IS_ADDR_LINKLOCAL(&sa->sa6.sin6_addr) &&
835 (!scopeid && !cached_scope_id))
836 {
837 cached_scope_id = getDefaultIPv6Interface(env, &sa->sa6);
838 (*env)->SetIntField(env, iaObj, ia6_cachedscopeidID, cached_scope_id);
839 }
840 sa->sa6.sin6_scope_id = scopeid == 0 ? cached_scope_id : scopeid;
841 if (len != NULL) {
842 *len = sizeof(struct sockaddr_in6);
843 }
844 } else {
845 jint address;
846 if (family != java_net_InetAddress_IPv4) {
847 JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException", "Protocol family unavailable");
848 return -1;
849 }
850 address = getInetAddress_addr(env, iaObj);
851 JNU_CHECK_EXCEPTION_RETURN(env, -1);
852 sa->sa4.sin_port = htons((short)port);
853 sa->sa4.sin_addr.s_addr = (u_long)htonl(address);
854 sa->sa4.sin_family = AF_INET;
855 if (len != NULL) {
856 *len = sizeof(struct sockaddr_in);
857 }
858 }
859 return 0;
860 }
861
862 int
863 NET_IsIPv4Mapped(jbyte* caddr) {
864 int i;
865 for (i = 0; i < 10; i++) {
866 if (caddr[i] != 0x00) {
867 return 0; /* false */
868 }
869 }
870
871 if (((caddr[10] & 0xff) == 0xff) && ((caddr[11] & 0xff) == 0xff)) {
872 return 1; /* true */
873 }
874 return 0; /* false */
875 }
876
877 int
878 NET_IPv4MappedToIPv4(jbyte* caddr) {
879 return ((caddr[12] & 0xff) << 24) | ((caddr[13] & 0xff) << 16) | ((caddr[14] & 0xff) << 8)
880 | (caddr[15] & 0xff);
881 }
882
883 int
884 NET_IsEqual(jbyte* caddr1, jbyte* caddr2) {
885 int i;
886 for (i = 0; i < 16; i++) {
887 if (caddr1[i] != caddr2[i]) {
888 return 0; /* false */
889 }
890 }
891 return 1;
892 }
893
894 /**
895 * Wrapper for select/poll with timeout on a single file descriptor.
896 *
897 * flags (defined in net_util_md.h can be any combination of
898 * NET_WAIT_READ, NET_WAIT_WRITE & NET_WAIT_CONNECT.
899 *
900 * The function will return when either the socket is ready for one
901 * of the specified operation or the timeout expired.
902 *
903 * It returns the time left from the timeout, or -1 if it expired.
904 */
905
906 jint
907 NET_Wait(JNIEnv *env, jint fd, jint flags, jint timeout)
908 {
909 jlong prevTime = JVM_CurrentTimeMillis(env, 0);
910 jint read_rv;
911
912 while (1) {
913 jlong newTime;
914 fd_set rd, wr, ex;
915 struct timeval t;
916
917 t.tv_sec = timeout / 1000;
918 t.tv_usec = (timeout % 1000) * 1000;
919
920 FD_ZERO(&rd);
921 FD_ZERO(&wr);
922 FD_ZERO(&ex);
923 if (flags & NET_WAIT_READ) {
924 FD_SET(fd, &rd);
925 }
926 if (flags & NET_WAIT_WRITE) {
927 FD_SET(fd, &wr);
928 }
929 if (flags & NET_WAIT_CONNECT) {
930 FD_SET(fd, &wr);
931 FD_SET(fd, &ex);
932 }
933
934 errno = 0;
935 read_rv = select(fd+1, &rd, &wr, &ex, &t);
936
937 newTime = JVM_CurrentTimeMillis(env, 0);
938 timeout -= (jint)(newTime - prevTime);
939 if (timeout <= 0) {
940 return read_rv > 0 ? 0 : -1;
941 }
942 newTime = prevTime;
943
944 if (read_rv > 0) {
945 break;
946 }
947
948
949 } /* while */
950
951 return timeout;
952 }
953
954 int NET_Socket (int domain, int type, int protocol) {
955 SOCKET sock;
956 sock = socket (domain, type, protocol);
957 if (sock != INVALID_SOCKET) {
958 SetHandleInformation((HANDLE)(uintptr_t)sock, HANDLE_FLAG_INHERIT, FALSE);
959 }
960 return (int)sock;
961 }