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libndr: for now align reverse relative pointers to 2 bytes by default.
[Samba/gbeck.git] / source3 / lib / util_sock.c
blobda79aca9df55e5e0d5dbc0ca57117186f2ebca70
1 /*
2 Unix SMB/CIFS implementation.
3 Samba utility functions
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Tim Potter 2000-2001
6 Copyright (C) Jeremy Allison 1992-2007
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include "includes.h"
23
24 /*******************************************************************
25 Map a text hostname or IP address (IPv4 or IPv6) into a
26 struct sockaddr_storage.
27 ******************************************************************/
28
29 bool interpret_string_addr(struct sockaddr_storage *pss,
30 const char *str,
31 int flags)
32 {
33 struct addrinfo *res = NULL;
34 #if defined(HAVE_IPV6)
35 char addr[INET6_ADDRSTRLEN];
36 unsigned int scope_id = 0;
37
38 if (strchr_m(str, ':')) {
39 char *p = strchr_m(str, '%');
40
41 /*
42 * Cope with link-local.
43 * This is IP:v6:addr%ifname.
44 */
45
46 if (p && (p > str) && ((scope_id = if_nametoindex(p+1)) != 0)) {
47 strlcpy(addr, str,
48 MIN(PTR_DIFF(p,str)+1,
49 sizeof(addr)));
50 str = addr;
51 }
52 }
53 #endif
54
55 zero_sockaddr(pss);
56
57 if (!interpret_string_addr_internal(&res, str, flags|AI_ADDRCONFIG)) {
58 return false;
59 }
60 if (!res) {
61 return false;
62 }
63 /* Copy the first sockaddr. */
64 memcpy(pss, res->ai_addr, res->ai_addrlen);
65
66 #if defined(HAVE_IPV6)
67 if (pss->ss_family == AF_INET6 && scope_id) {
68 struct sockaddr_in6 *ps6 = (struct sockaddr_in6 *)pss;
69 if (IN6_IS_ADDR_LINKLOCAL(&ps6->sin6_addr) &&
70 ps6->sin6_scope_id == 0) {
71 ps6->sin6_scope_id = scope_id;
72 }
73 }
74 #endif
75
76 freeaddrinfo(res);
77 return true;
78 }
79
80 /*******************************************************************
81 Set an address to INADDR_ANY.
82 ******************************************************************/
83
84 void zero_sockaddr(struct sockaddr_storage *pss)
85 {
86 memset(pss, '\0', sizeof(*pss));
87 /* Ensure we're at least a valid sockaddr-storage. */
88 pss->ss_family = AF_INET;
89 }
90
91 /****************************************************************************
92 Get a port number in host byte order from a sockaddr_storage.
93 ****************************************************************************/
94
95 uint16_t get_sockaddr_port(const struct sockaddr_storage *pss)
96 {
97 uint16_t port = 0;
98
99 if (pss->ss_family != AF_INET) {
100 #if defined(HAVE_IPV6)
101 /* IPv6 */
102 const struct sockaddr_in6 *sa6 =
103 (const struct sockaddr_in6 *)pss;
104 port = ntohs(sa6->sin6_port);
105 #endif
106 } else {
107 const struct sockaddr_in *sa =
108 (const struct sockaddr_in *)pss;
109 port = ntohs(sa->sin_port);
110 }
111 return port;
112 }
113
114 /****************************************************************************
115 Print out an IPv4 or IPv6 address from a struct sockaddr_storage.
116 ****************************************************************************/
117
118 static char *print_sockaddr_len(char *dest,
119 size_t destlen,
120 const struct sockaddr *psa,
121 socklen_t psalen)
122 {
123 if (destlen > 0) {
124 dest[0] = '\0';
125 }
126 (void)sys_getnameinfo(psa,
127 psalen,
128 dest, destlen,
129 NULL, 0,
130 NI_NUMERICHOST);
131 return dest;
132 }
133
134 /****************************************************************************
135 Print out an IPv4 or IPv6 address from a struct sockaddr_storage.
136 ****************************************************************************/
137
138 char *print_sockaddr(char *dest,
139 size_t destlen,
140 const struct sockaddr_storage *psa)
141 {
142 return print_sockaddr_len(dest, destlen, (struct sockaddr *)psa,
143 sizeof(struct sockaddr_storage));
144 }
145
146 /****************************************************************************
147 Print out a canonical IPv4 or IPv6 address from a struct sockaddr_storage.
148 ****************************************************************************/
149
150 char *print_canonical_sockaddr(TALLOC_CTX *ctx,
151 const struct sockaddr_storage *pss)
152 {
153 char addr[INET6_ADDRSTRLEN];
154 char *dest = NULL;
155 int ret;
156
157 /* Linux getnameinfo() man pages says port is unitialized if
158 service name is NULL. */
159
160 ret = sys_getnameinfo((const struct sockaddr *)pss,
161 sizeof(struct sockaddr_storage),
162 addr, sizeof(addr),
163 NULL, 0,
164 NI_NUMERICHOST);
165 if (ret != 0) {
166 return NULL;
167 }
168
169 if (pss->ss_family != AF_INET) {
170 #if defined(HAVE_IPV6)
171 dest = talloc_asprintf(ctx, "[%s]", addr);
172 #else
173 return NULL;
174 #endif
175 } else {
176 dest = talloc_asprintf(ctx, "%s", addr);
177 }
178
179 return dest;
180 }
181
182 /****************************************************************************
183 Return the string of an IP address (IPv4 or IPv6).
184 ****************************************************************************/
185
186 static const char *get_socket_addr(int fd, char *addr_buf, size_t addr_len)
187 {
188 struct sockaddr_storage sa;
189 socklen_t length = sizeof(sa);
190
191 /* Ok, returning a hard coded IPv4 address
192 * is bogus, but it's just as bogus as a
193 * zero IPv6 address. No good choice here.
194 */
195
196 strlcpy(addr_buf, "0.0.0.0", addr_len);
197
198 if (fd == -1) {
199 return addr_buf;
200 }
201
202 if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) {
203 DEBUG(0,("getsockname failed. Error was %s\n",
204 strerror(errno) ));
205 return addr_buf;
206 }
207
208 return print_sockaddr_len(addr_buf, addr_len, (struct sockaddr *)&sa, length);
209 }
210
211 #if 0
212 /* Not currently used. JRA. */
213 /****************************************************************************
214 Return the port number we've bound to on a socket.
215 ****************************************************************************/
216
217 static int get_socket_port(int fd)
218 {
219 struct sockaddr_storage sa;
220 socklen_t length = sizeof(sa);
221
222 if (fd == -1) {
223 return -1;
224 }
225
226 if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) {
227 DEBUG(0,("getpeername failed. Error was %s\n",
228 strerror(errno) ));
229 return -1;
230 }
231
232 #if defined(HAVE_IPV6)
233 if (sa.ss_family == AF_INET6) {
234 return ntohs(((struct sockaddr_in6 *)&sa)->sin6_port);
235 }
236 #endif
237 if (sa.ss_family == AF_INET) {
238 return ntohs(((struct sockaddr_in *)&sa)->sin_port);
239 }
240 return -1;
241 }
242 #endif
243
244 const char *client_name(int fd)
245 {
246 return get_peer_name(fd,false);
247 }
248
249 const char *client_addr(int fd, char *addr, size_t addrlen)
250 {
251 return get_peer_addr(fd,addr,addrlen);
252 }
253
254 const char *client_socket_addr(int fd, char *addr, size_t addr_len)
255 {
256 return get_socket_addr(fd, addr, addr_len);
257 }
258
259 #if 0
260 /* Not currently used. JRA. */
261 int client_socket_port(int fd)
262 {
263 return get_socket_port(fd);
264 }
265 #endif
266
267 /****************************************************************************
268 Accessor functions to make thread-safe code easier later...
269 ****************************************************************************/
270
271 void set_smb_read_error(enum smb_read_errors *pre,
272 enum smb_read_errors newerr)
273 {
274 if (pre) {
275 *pre = newerr;
276 }
277 }
278
279 void cond_set_smb_read_error(enum smb_read_errors *pre,
280 enum smb_read_errors newerr)
281 {
282 if (pre && *pre == SMB_READ_OK) {
283 *pre = newerr;
284 }
285 }
286
287 /****************************************************************************
288 Determine if a file descriptor is in fact a socket.
289 ****************************************************************************/
290
291 bool is_a_socket(int fd)
292 {
293 int v;
294 socklen_t l;
295 l = sizeof(int);
296 return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
297 }
298
299 enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON};
300
301 typedef struct smb_socket_option {
302 const char *name;
303 int level;
304 int option;
305 int value;
306 int opttype;
307 } smb_socket_option;
308
309 static const smb_socket_option socket_options[] = {
310 {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL},
311 {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL},
312 {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL},
313 #ifdef TCP_NODELAY
314 {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL},
315 #endif
316 #ifdef TCP_KEEPCNT
317 {"TCP_KEEPCNT", IPPROTO_TCP, TCP_KEEPCNT, 0, OPT_INT},
318 #endif
319 #ifdef TCP_KEEPIDLE
320 {"TCP_KEEPIDLE", IPPROTO_TCP, TCP_KEEPIDLE, 0, OPT_INT},
321 #endif
322 #ifdef TCP_KEEPINTVL
323 {"TCP_KEEPINTVL", IPPROTO_TCP, TCP_KEEPINTVL, 0, OPT_INT},
324 #endif
325 #ifdef IPTOS_LOWDELAY
326 {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON},
327 #endif
328 #ifdef IPTOS_THROUGHPUT
329 {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON},
330 #endif
331 #ifdef SO_REUSEPORT
332 {"SO_REUSEPORT", SOL_SOCKET, SO_REUSEPORT, 0, OPT_BOOL},
333 #endif
334 #ifdef SO_SNDBUF
335 {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT},
336 #endif
337 #ifdef SO_RCVBUF
338 {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT},
339 #endif
340 #ifdef SO_SNDLOWAT
341 {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT},
342 #endif
343 #ifdef SO_RCVLOWAT
344 {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT},
345 #endif
346 #ifdef SO_SNDTIMEO
347 {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT},
348 #endif
349 #ifdef SO_RCVTIMEO
350 {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT},
351 #endif
352 #ifdef TCP_FASTACK
353 {"TCP_FASTACK", IPPROTO_TCP, TCP_FASTACK, 0, OPT_INT},
354 #endif
355 {NULL,0,0,0,0}};
356
357 /****************************************************************************
358 Print socket options.
359 ****************************************************************************/
360
361 static void print_socket_options(int s)
362 {
363 int value;
364 socklen_t vlen = 4;
365 const smb_socket_option *p = &socket_options[0];
366
367 /* wrapped in if statement to prevent streams
368 * leak in SCO Openserver 5.0 */
369 /* reported on samba-technical --jerry */
370 if ( DEBUGLEVEL >= 5 ) {
371 DEBUG(5,("Socket options:\n"));
372 for (; p->name != NULL; p++) {
373 if (getsockopt(s, p->level, p->option,
374 (void *)&value, &vlen) == -1) {
375 DEBUGADD(5,("\tCould not test socket option %s.\n",
376 p->name));
377 } else {
378 DEBUGADD(5,("\t%s = %d\n",
379 p->name,value));
380 }
381 }
382 }
383 }
384
385 /****************************************************************************
386 Set user socket options.
387 ****************************************************************************/
388
389 void set_socket_options(int fd, const char *options)
390 {
391 TALLOC_CTX *ctx = talloc_stackframe();
392 char *tok;
393
394 while (next_token_talloc(ctx, &options, &tok," \t,")) {
395 int ret=0,i;
396 int value = 1;
397 char *p;
398 bool got_value = false;
399
400 if ((p = strchr_m(tok,'='))) {
401 *p = 0;
402 value = atoi(p+1);
403 got_value = true;
404 }
405
406 for (i=0;socket_options[i].name;i++)
407 if (strequal(socket_options[i].name,tok))
408 break;
409
410 if (!socket_options[i].name) {
411 DEBUG(0,("Unknown socket option %s\n",tok));
412 continue;
413 }
414
415 switch (socket_options[i].opttype) {
416 case OPT_BOOL:
417 case OPT_INT:
418 ret = setsockopt(fd,socket_options[i].level,
419 socket_options[i].option,
420 (char *)&value,sizeof(int));
421 break;
422
423 case OPT_ON:
424 if (got_value)
425 DEBUG(0,("syntax error - %s "
426 "does not take a value\n",tok));
427
428 {
429 int on = socket_options[i].value;
430 ret = setsockopt(fd,socket_options[i].level,
431 socket_options[i].option,
432 (char *)&on,sizeof(int));
433 }
434 break;
435 }
436
437 if (ret != 0) {
438 /* be aware that some systems like Solaris return
439 * EINVAL to a setsockopt() call when the client
440 * sent a RST previously - no need to worry */
441 DEBUG(2,("Failed to set socket option %s (Error %s)\n",
442 tok, strerror(errno) ));
443 }
444 }
445
446 TALLOC_FREE(ctx);
447 print_socket_options(fd);
448 }
449
450 /****************************************************************************
451 Read from a socket.
452 ****************************************************************************/
453
454 ssize_t read_udp_v4_socket(int fd,
455 char *buf,
456 size_t len,
457 struct sockaddr_storage *psa)
458 {
459 ssize_t ret;
460 socklen_t socklen = sizeof(*psa);
461 struct sockaddr_in *si = (struct sockaddr_in *)psa;
462
463 memset((char *)psa,'\0',socklen);
464
465 ret = (ssize_t)sys_recvfrom(fd,buf,len,0,
466 (struct sockaddr *)psa,&socklen);
467 if (ret <= 0) {
468 /* Don't print a low debug error for a non-blocking socket. */
469 if (errno == EAGAIN) {
470 DEBUG(10,("read_udp_v4_socket: returned EAGAIN\n"));
471 } else {
472 DEBUG(2,("read_udp_v4_socket: failed. errno=%s\n",
473 strerror(errno)));
474 }
475 return 0;
476 }
477
478 if (psa->ss_family != AF_INET) {
479 DEBUG(2,("read_udp_v4_socket: invalid address family %d "
480 "(not IPv4)\n", (int)psa->ss_family));
481 return 0;
482 }
483
484 DEBUG(10,("read_udp_v4_socket: ip %s port %d read: %lu\n",
485 inet_ntoa(si->sin_addr),
486 si->sin_port,
487 (unsigned long)ret));
488
489 return ret;
490 }
491
492 /****************************************************************************
493 Read data from a file descriptor with a timout in msec.
494 mincount = if timeout, minimum to read before returning
495 maxcount = number to be read.
496 time_out = timeout in milliseconds
497 NB. This can be called with a non-socket fd, don't change
498 sys_read() to sys_recv() or other socket call.
499 ****************************************************************************/
500
501 NTSTATUS read_fd_with_timeout(int fd, char *buf,
502 size_t mincnt, size_t maxcnt,
503 unsigned int time_out,
504 size_t *size_ret)
505 {
506 fd_set fds;
507 int selrtn;
508 ssize_t readret;
509 size_t nread = 0;
510 struct timeval timeout;
511 char addr[INET6_ADDRSTRLEN];
512
513 /* just checking .... */
514 if (maxcnt <= 0)
515 return NT_STATUS_OK;
516
517 /* Blocking read */
518 if (time_out == 0) {
519 if (mincnt == 0) {
520 mincnt = maxcnt;
521 }
522
523 while (nread < mincnt) {
524 readret = sys_read(fd, buf + nread, maxcnt - nread);
525
526 if (readret == 0) {
527 DEBUG(5,("read_fd_with_timeout: "
528 "blocking read. EOF from client.\n"));
529 return NT_STATUS_END_OF_FILE;
530 }
531
532 if (readret == -1) {
533 if (fd == get_client_fd()) {
534 /* Try and give an error message
535 * saying what client failed. */
536 DEBUG(0,("read_fd_with_timeout: "
537 "client %s read error = %s.\n",
538 get_peer_addr(fd,addr,sizeof(addr)),
539 strerror(errno) ));
540 } else {
541 DEBUG(0,("read_fd_with_timeout: "
542 "read error = %s.\n",
543 strerror(errno) ));
544 }
545 return map_nt_error_from_unix(errno);
546 }
547 nread += readret;
548 }
549 goto done;
550 }
551
552 /* Most difficult - timeout read */
553 /* If this is ever called on a disk file and
554 mincnt is greater then the filesize then
555 system performance will suffer severely as
556 select always returns true on disk files */
557
558 /* Set initial timeout */
559 timeout.tv_sec = (time_t)(time_out / 1000);
560 timeout.tv_usec = (long)(1000 * (time_out % 1000));
561
562 for (nread=0; nread < mincnt; ) {
563 FD_ZERO(&fds);
564 FD_SET(fd,&fds);
565
566 selrtn = sys_select_intr(fd+1,&fds,NULL,NULL,&timeout);
567
568 /* Check if error */
569 if (selrtn == -1) {
570 /* something is wrong. Maybe the socket is dead? */
571 if (fd == get_client_fd()) {
572 /* Try and give an error message saying
573 * what client failed. */
574 DEBUG(0,("read_fd_with_timeout: timeout "
575 "read for client %s. select error = %s.\n",
576 get_peer_addr(fd,addr,sizeof(addr)),
577 strerror(errno) ));
578 } else {
579 DEBUG(0,("read_fd_with_timeout: timeout "
580 "read. select error = %s.\n",
581 strerror(errno) ));
582 }
583 return map_nt_error_from_unix(errno);
584 }
585
586 /* Did we timeout ? */
587 if (selrtn == 0) {
588 DEBUG(10,("read_fd_with_timeout: timeout read. "
589 "select timed out.\n"));
590 return NT_STATUS_IO_TIMEOUT;
591 }
592
593 readret = sys_read(fd, buf+nread, maxcnt-nread);
594
595 if (readret == 0) {
596 /* we got EOF on the file descriptor */
597 DEBUG(5,("read_fd_with_timeout: timeout read. "
598 "EOF from client.\n"));
599 return NT_STATUS_END_OF_FILE;
600 }
601
602 if (readret == -1) {
603 /* the descriptor is probably dead */
604 if (fd == get_client_fd()) {
605 /* Try and give an error message
606 * saying what client failed. */
607 DEBUG(0,("read_fd_with_timeout: timeout "
608 "read to client %s. read error = %s.\n",
609 get_peer_addr(fd,addr,sizeof(addr)),
610 strerror(errno) ));
611 } else {
612 DEBUG(0,("read_fd_with_timeout: timeout "
613 "read. read error = %s.\n",
614 strerror(errno) ));
615 }
616 return map_nt_error_from_unix(errno);
617 }
618
619 nread += readret;
620 }
621
622 done:
623 /* Return the number we got */
624 if (size_ret) {
625 *size_ret = nread;
626 }
627 return NT_STATUS_OK;
628 }
629
630 /****************************************************************************
631 Read data from an fd, reading exactly N bytes.
632 NB. This can be called with a non-socket fd, don't add dependencies
633 on socket calls.
634 ****************************************************************************/
635
636 NTSTATUS read_data(int fd, char *buffer, size_t N)
637 {
638 return read_fd_with_timeout(fd, buffer, N, N, 0, NULL);
639 }
640
641 /****************************************************************************
642 Write all data from an iov array
643 NB. This can be called with a non-socket fd, don't add dependencies
644 on socket calls.
645 ****************************************************************************/
646
647 ssize_t write_data_iov(int fd, const struct iovec *orig_iov, int iovcnt)
648 {
649 int i;
650 size_t to_send;
651 ssize_t thistime;
652 size_t sent;
653 struct iovec *iov_copy, *iov;
654
655 to_send = 0;
656 for (i=0; i<iovcnt; i++) {
657 to_send += orig_iov[i].iov_len;
658 }
659
660 thistime = sys_writev(fd, orig_iov, iovcnt);
661 if ((thistime <= 0) || (thistime == to_send)) {
662 return thistime;
663 }
664 sent = thistime;
665
666 /*
667 * We could not send everything in one call. Make a copy of iov that
668 * we can mess with. We keep a copy of the array start in iov_copy for
669 * the TALLOC_FREE, because we're going to modify iov later on,
670 * discarding elements.
671 */
672
673 iov_copy = (struct iovec *)TALLOC_MEMDUP(
674 talloc_tos(), orig_iov, sizeof(struct iovec) * iovcnt);
675
676 if (iov_copy == NULL) {
677 errno = ENOMEM;
678 return -1;
679 }
680 iov = iov_copy;
681
682 while (sent < to_send) {
683 /*
684 * We have to discard "thistime" bytes from the beginning
685 * iov array, "thistime" contains the number of bytes sent
686 * via writev last.
687 */
688 while (thistime > 0) {
689 if (thistime < iov[0].iov_len) {
690 char *new_base =
691 (char *)iov[0].iov_base + thistime;
692 iov[0].iov_base = new_base;
693 iov[0].iov_len -= thistime;
694 break;
695 }
696 thistime -= iov[0].iov_len;
697 iov += 1;
698 iovcnt -= 1;
699 }
700
701 thistime = sys_writev(fd, iov, iovcnt);
702 if (thistime <= 0) {
703 break;
704 }
705 sent += thistime;
706 }
707
708 TALLOC_FREE(iov_copy);
709 return sent;
710 }
711
712 /****************************************************************************
713 Write data to a fd.
714 NB. This can be called with a non-socket fd, don't add dependencies
715 on socket calls.
716 ****************************************************************************/
717
718 ssize_t write_data(int fd, const char *buffer, size_t N)
719 {
720 ssize_t ret;
721 struct iovec iov;
722
723 iov.iov_base = CONST_DISCARD(char *, buffer);
724 iov.iov_len = N;
725
726 ret = write_data_iov(fd, &iov, 1);
727 if (ret >= 0) {
728 return ret;
729 }
730
731 if (fd == get_client_fd()) {
732 char addr[INET6_ADDRSTRLEN];
733 /*
734 * Try and give an error message saying what client failed.
735 */
736 DEBUG(0, ("write_data: write failure in writing to client %s. "
737 "Error %s\n", get_peer_addr(fd,addr,sizeof(addr)),
738 strerror(errno)));
739 } else {
740 DEBUG(0,("write_data: write failure. Error = %s\n",
741 strerror(errno) ));
742 }
743
744 return -1;
745 }
746
747 /****************************************************************************
748 Send a keepalive packet (rfc1002).
749 ****************************************************************************/
750
751 bool send_keepalive(int client)
752 {
753 unsigned char buf[4];
754
755 buf[0] = SMBkeepalive;
756 buf[1] = buf[2] = buf[3] = 0;
757
758 return(write_data(client,(char *)buf,4) == 4);
759 }
760
761 /****************************************************************************
762 Read 4 bytes of a smb packet and return the smb length of the packet.
763 Store the result in the buffer.
764 This version of the function will return a length of zero on receiving
765 a keepalive packet.
766 Timeout is in milliseconds.
767 ****************************************************************************/
768
769 NTSTATUS read_smb_length_return_keepalive(int fd, char *inbuf,
770 unsigned int timeout,
771 size_t *len)
772 {
773 int msg_type;
774 NTSTATUS status;
775
776 status = read_fd_with_timeout(fd, inbuf, 4, 4, timeout, NULL);
777
778 if (!NT_STATUS_IS_OK(status)) {
779 return status;
780 }
781
782 *len = smb_len(inbuf);
783 msg_type = CVAL(inbuf,0);
784
785 if (msg_type == SMBkeepalive) {
786 DEBUG(5,("Got keepalive packet\n"));
787 }
788
789 DEBUG(10,("got smb length of %lu\n",(unsigned long)(*len)));
790
791 return NT_STATUS_OK;
792 }
793
794 /****************************************************************************
795 Read 4 bytes of a smb packet and return the smb length of the packet.
796 Store the result in the buffer. This version of the function will
797 never return a session keepalive (length of zero).
798 Timeout is in milliseconds.
799 ****************************************************************************/
800
801 NTSTATUS read_smb_length(int fd, char *inbuf, unsigned int timeout,
802 size_t *len)
803 {
804 uint8_t msgtype = SMBkeepalive;
805
806 while (msgtype == SMBkeepalive) {
807 NTSTATUS status;
808
809 status = read_smb_length_return_keepalive(fd, inbuf, timeout,
810 len);
811 if (!NT_STATUS_IS_OK(status)) {
812 return status;
813 }
814
815 msgtype = CVAL(inbuf, 0);
816 }
817
818 DEBUG(10,("read_smb_length: got smb length of %lu\n",
819 (unsigned long)len));
820
821 return NT_STATUS_OK;
822 }
823
824 /****************************************************************************
825 Read an smb from a fd.
826 The timeout is in milliseconds.
827 This function will return on receipt of a session keepalive packet.
828 maxlen is the max number of bytes to return, not including the 4 byte
829 length. If zero it means buflen limit.
830 Doesn't check the MAC on signed packets.
831 ****************************************************************************/
832
833 NTSTATUS receive_smb_raw(int fd, char *buffer, size_t buflen, unsigned int timeout,
834 size_t maxlen, size_t *p_len)
835 {
836 size_t len;
837 NTSTATUS status;
838
839 status = read_smb_length_return_keepalive(fd,buffer,timeout,&len);
840
841 if (!NT_STATUS_IS_OK(status)) {
842 DEBUG(10, ("receive_smb_raw: %s!\n", nt_errstr(status)));
843 return status;
844 }
845
846 if (len > buflen) {
847 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
848 (unsigned long)len));
849 return NT_STATUS_INVALID_PARAMETER;
850 }
851
852 if(len > 0) {
853 if (maxlen) {
854 len = MIN(len,maxlen);
855 }
856
857 status = read_fd_with_timeout(
858 fd, buffer+4, len, len, timeout, &len);
859
860 if (!NT_STATUS_IS_OK(status)) {
861 return status;
862 }
863
864 /* not all of samba3 properly checks for packet-termination
865 * of strings. This ensures that we don't run off into
866 * empty space. */
867 SSVAL(buffer+4,len, 0);
868 }
869
870 *p_len = len;
871 return NT_STATUS_OK;
872 }
873
874 /****************************************************************************
875 Open a socket of the specified type, port, and address for incoming data.
876 ****************************************************************************/
877
878 int open_socket_in(int type,
879 uint16_t port,
880 int dlevel,
881 const struct sockaddr_storage *psock,
882 bool rebind)
883 {
884 struct sockaddr_storage sock;
885 int res;
886 socklen_t slen = sizeof(struct sockaddr_in);
887
888 sock = *psock;
889
890 #if defined(HAVE_IPV6)
891 if (sock.ss_family == AF_INET6) {
892 ((struct sockaddr_in6 *)&sock)->sin6_port = htons(port);
893 slen = sizeof(struct sockaddr_in6);
894 }
895 #endif
896 if (sock.ss_family == AF_INET) {
897 ((struct sockaddr_in *)&sock)->sin_port = htons(port);
898 }
899
900 res = socket(sock.ss_family, type, 0 );
901 if( res == -1 ) {
902 if( DEBUGLVL(0) ) {
903 dbgtext( "open_socket_in(): socket() call failed: " );
904 dbgtext( "%s\n", strerror( errno ) );
905 }
906 return -1;
907 }
908
909 /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
910 {
911 int val = rebind ? 1 : 0;
912 if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,
913 (char *)&val,sizeof(val)) == -1 ) {
914 if( DEBUGLVL( dlevel ) ) {
915 dbgtext( "open_socket_in(): setsockopt: " );
916 dbgtext( "SO_REUSEADDR = %s ",
917 val?"true":"false" );
918 dbgtext( "on port %d failed ", port );
919 dbgtext( "with error = %s\n", strerror(errno) );
920 }
921 }
922 #ifdef SO_REUSEPORT
923 if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,
924 (char *)&val,sizeof(val)) == -1 ) {
925 if( DEBUGLVL( dlevel ) ) {
926 dbgtext( "open_socket_in(): setsockopt: ");
927 dbgtext( "SO_REUSEPORT = %s ",
928 val?"true":"false");
929 dbgtext( "on port %d failed ", port);
930 dbgtext( "with error = %s\n", strerror(errno));
931 }
932 }
933 #endif /* SO_REUSEPORT */
934 }
935
936 /* now we've got a socket - we need to bind it */
937 if (bind(res, (struct sockaddr *)&sock, slen) == -1 ) {
938 if( DEBUGLVL(dlevel) && (port == SMB_PORT1 ||
939 port == SMB_PORT2 || port == NMB_PORT) ) {
940 char addr[INET6_ADDRSTRLEN];
941 print_sockaddr(addr, sizeof(addr),
942 &sock);
943 dbgtext( "bind failed on port %d ", port);
944 dbgtext( "socket_addr = %s.\n", addr);
945 dbgtext( "Error = %s\n", strerror(errno));
946 }
947 close(res);
948 return -1;
949 }
950
951 DEBUG( 10, ( "bind succeeded on port %d\n", port ) );
952 return( res );
953 }
954
955 struct open_socket_out_state {
956 int fd;
957 struct event_context *ev;
958 struct sockaddr_storage ss;
959 socklen_t salen;
960 uint16_t port;
961 int wait_nsec;
962 };
963
964 static void open_socket_out_connected(struct tevent_req *subreq);
965
966 static int open_socket_out_state_destructor(struct open_socket_out_state *s)
967 {
968 if (s->fd != -1) {
969 close(s->fd);
970 }
971 return 0;
972 }
973
974 /****************************************************************************
975 Create an outgoing socket. timeout is in milliseconds.
976 **************************************************************************/
977
978 struct tevent_req *open_socket_out_send(TALLOC_CTX *mem_ctx,
979 struct event_context *ev,
980 const struct sockaddr_storage *pss,
981 uint16_t port,
982 int timeout)
983 {
984 char addr[INET6_ADDRSTRLEN];
985 struct tevent_req *result, *subreq;
986 struct open_socket_out_state *state;
987 NTSTATUS status;
988
989 result = tevent_req_create(mem_ctx, &state,
990 struct open_socket_out_state);
991 if (result == NULL) {
992 return NULL;
993 }
994 state->ev = ev;
995 state->ss = *pss;
996 state->port = port;
997 state->wait_nsec = 10000;
998 state->salen = -1;
999
1000 state->fd = socket(state->ss.ss_family, SOCK_STREAM, 0);
1001 if (state->fd == -1) {
1002 status = map_nt_error_from_unix(errno);
1003 goto post_status;
1004 }
1005 talloc_set_destructor(state, open_socket_out_state_destructor);
1006
1007 if (!tevent_req_set_endtime(
1008 result, ev, timeval_current_ofs(0, timeout*1000))) {
1009 goto fail;
1010 }
1011
1012 #if defined(HAVE_IPV6)
1013 if (pss->ss_family == AF_INET6) {
1014 struct sockaddr_in6 *psa6;
1015 psa6 = (struct sockaddr_in6 *)&state->ss;
1016 psa6->sin6_port = htons(port);
1017 if (psa6->sin6_scope_id == 0
1018 && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
1019 setup_linklocal_scope_id(
1020 (struct sockaddr *)&(state->ss));
1021 }
1022 state->salen = sizeof(struct sockaddr_in6);
1023 }
1024 #endif
1025 if (pss->ss_family == AF_INET) {
1026 struct sockaddr_in *psa;
1027 psa = (struct sockaddr_in *)&state->ss;
1028 psa->sin_port = htons(port);
1029 state->salen = sizeof(struct sockaddr_in);
1030 }
1031
1032 print_sockaddr(addr, sizeof(addr), &state->ss);
1033 DEBUG(3,("Connecting to %s at port %u\n", addr, (unsigned int)port));
1034
1035 subreq = async_connect_send(state, state->ev, state->fd,
1036 (struct sockaddr *)&state->ss,
1037 state->salen);
1038 if ((subreq == NULL)
1039 || !tevent_req_set_endtime(
1040 subreq, state->ev,
1041 timeval_current_ofs(0, state->wait_nsec))) {
1042 goto fail;
1043 }
1044 tevent_req_set_callback(subreq, open_socket_out_connected, result);
1045 return result;
1046
1047 post_status:
1048 tevent_req_nterror(result, status);
1049 return tevent_req_post(result, ev);
1050 fail:
1051 TALLOC_FREE(result);
1052 return NULL;
1053 }
1054
1055 static void open_socket_out_connected(struct tevent_req *subreq)
1056 {
1057 struct tevent_req *req =
1058 tevent_req_callback_data(subreq, struct tevent_req);
1059 struct open_socket_out_state *state =
1060 tevent_req_data(req, struct open_socket_out_state);
1061 int ret;
1062 int sys_errno;
1063
1064 ret = async_connect_recv(subreq, &sys_errno);
1065 TALLOC_FREE(subreq);
1066 if (ret == 0) {
1067 tevent_req_done(req);
1068 return;
1069 }
1070
1071 if (
1072 #ifdef ETIMEDOUT
1073 (sys_errno == ETIMEDOUT) ||
1074 #endif
1075 (sys_errno == EINPROGRESS) ||
1076 (sys_errno == EALREADY) ||
1077 (sys_errno == EAGAIN)) {
1078
1079 /*
1080 * retry
1081 */
1082
1083 if (state->wait_nsec < 250000) {
1084 state->wait_nsec *= 1.5;
1085 }
1086
1087 subreq = async_connect_send(state, state->ev, state->fd,
1088 (struct sockaddr *)&state->ss,
1089 state->salen);
1090 if (tevent_req_nomem(subreq, req)) {
1091 return;
1092 }
1093 if (!tevent_req_set_endtime(
1094 subreq, state->ev,
1095 timeval_current_ofs(0, state->wait_nsec))) {
1096 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1097 return;
1098 }
1099 tevent_req_set_callback(subreq, open_socket_out_connected, req);
1100 return;
1101 }
1102
1103 #ifdef EISCONN
1104 if (sys_errno == EISCONN) {
1105 tevent_req_done(req);
1106 return;
1107 }
1108 #endif
1109
1110 /* real error */
1111 tevent_req_nterror(req, map_nt_error_from_unix(sys_errno));
1112 }
1113
1114 NTSTATUS open_socket_out_recv(struct tevent_req *req, int *pfd)
1115 {
1116 struct open_socket_out_state *state =
1117 tevent_req_data(req, struct open_socket_out_state);
1118 NTSTATUS status;
1119
1120 if (tevent_req_is_nterror(req, &status)) {
1121 return status;
1122 }
1123 *pfd = state->fd;
1124 state->fd = -1;
1125 return NT_STATUS_OK;
1126 }
1127
1128 NTSTATUS open_socket_out(const struct sockaddr_storage *pss, uint16_t port,
1129 int timeout, int *pfd)
1130 {
1131 TALLOC_CTX *frame = talloc_stackframe();
1132 struct event_context *ev;
1133 struct tevent_req *req;
1134 NTSTATUS status = NT_STATUS_NO_MEMORY;
1135
1136 ev = event_context_init(frame);
1137 if (ev == NULL) {
1138 goto fail;
1139 }
1140
1141 req = open_socket_out_send(frame, ev, pss, port, timeout);
1142 if (req == NULL) {
1143 goto fail;
1144 }
1145 if (!tevent_req_poll(req, ev)) {
1146 status = NT_STATUS_INTERNAL_ERROR;
1147 goto fail;
1148 }
1149 status = open_socket_out_recv(req, pfd);
1150 fail:
1151 TALLOC_FREE(frame);
1152 return status;
1153 }
1154
1155 struct open_socket_out_defer_state {
1156 struct event_context *ev;
1157 struct sockaddr_storage ss;
1158 uint16_t port;
1159 int timeout;
1160 int fd;
1161 };
1162
1163 static void open_socket_out_defer_waited(struct tevent_req *subreq);
1164 static void open_socket_out_defer_connected(struct tevent_req *subreq);
1165
1166 struct tevent_req *open_socket_out_defer_send(TALLOC_CTX *mem_ctx,
1167 struct event_context *ev,
1168 struct timeval wait_time,
1169 const struct sockaddr_storage *pss,
1170 uint16_t port,
1171 int timeout)
1172 {
1173 struct tevent_req *req, *subreq;
1174 struct open_socket_out_defer_state *state;
1175
1176 req = tevent_req_create(mem_ctx, &state,
1177 struct open_socket_out_defer_state);
1178 if (req == NULL) {
1179 return NULL;
1180 }
1181 state->ev = ev;
1182 state->ss = *pss;
1183 state->port = port;
1184 state->timeout = timeout;
1185
1186 subreq = tevent_wakeup_send(
1187 state, ev,
1188 timeval_current_ofs(wait_time.tv_sec, wait_time.tv_usec));
1189 if (subreq == NULL) {
1190 goto fail;
1191 }
1192 tevent_req_set_callback(subreq, open_socket_out_defer_waited, req);
1193 return req;
1194 fail:
1195 TALLOC_FREE(req);
1196 return NULL;
1197 }
1198
1199 static void open_socket_out_defer_waited(struct tevent_req *subreq)
1200 {
1201 struct tevent_req *req = tevent_req_callback_data(
1202 subreq, struct tevent_req);
1203 struct open_socket_out_defer_state *state = tevent_req_data(
1204 req, struct open_socket_out_defer_state);
1205 bool ret;
1206
1207 ret = tevent_wakeup_recv(subreq);
1208 TALLOC_FREE(subreq);
1209 if (!ret) {
1210 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
1211 return;
1212 }
1213
1214 subreq = open_socket_out_send(state, state->ev, &state->ss,
1215 state->port, state->timeout);
1216 if (tevent_req_nomem(subreq, req)) {
1217 return;
1218 }
1219 tevent_req_set_callback(subreq, open_socket_out_defer_connected, req);
1220 }
1221
1222 static void open_socket_out_defer_connected(struct tevent_req *subreq)
1223 {
1224 struct tevent_req *req = tevent_req_callback_data(
1225 subreq, struct tevent_req);
1226 struct open_socket_out_defer_state *state = tevent_req_data(
1227 req, struct open_socket_out_defer_state);
1228 NTSTATUS status;
1229
1230 status = open_socket_out_recv(subreq, &state->fd);
1231 TALLOC_FREE(subreq);
1232 if (!NT_STATUS_IS_OK(status)) {
1233 tevent_req_nterror(req, status);
1234 return;
1235 }
1236 tevent_req_done(req);
1237 }
1238
1239 NTSTATUS open_socket_out_defer_recv(struct tevent_req *req, int *pfd)
1240 {
1241 struct open_socket_out_defer_state *state = tevent_req_data(
1242 req, struct open_socket_out_defer_state);
1243 NTSTATUS status;
1244
1245 if (tevent_req_is_nterror(req, &status)) {
1246 return status;
1247 }
1248 *pfd = state->fd;
1249 state->fd = -1;
1250 return NT_STATUS_OK;
1251 }
1252
1253 /*******************************************************************
1254 Create an outgoing TCP socket to the first addr that connects.
1255
1256 This is for simultaneous connection attempts to port 445 and 139 of a host
1257 or for simultatneous connection attempts to multiple DCs at once. We return
1258 a socket fd of the first successful connection.
1259
1260 @param[in] addrs list of Internet addresses and ports to connect to
1261 @param[in] num_addrs number of address/port pairs in the addrs list
1262 @param[in] timeout time after which we stop waiting for a socket connection
1263 to succeed, given in milliseconds
1264 @param[out] fd_index the entry in addrs which we successfully connected to
1265 @param[out] fd fd of the open and connected socket
1266 @return true on a successful connection, false if all connection attempts
1267 failed or we timed out
1268 *******************************************************************/
1269
1270 bool open_any_socket_out(struct sockaddr_storage *addrs, int num_addrs,
1271 int timeout, int *fd_index, int *fd)
1272 {
1273 int i, resulting_index, res;
1274 int *sockets;
1275 bool good_connect;
1276
1277 fd_set r_fds, wr_fds;
1278 struct timeval tv;
1279 int maxfd;
1280
1281 int connect_loop = 10000; /* 10 milliseconds */
1282
1283 timeout *= 1000; /* convert to microseconds */
1284
1285 sockets = SMB_MALLOC_ARRAY(int, num_addrs);
1286
1287 if (sockets == NULL)
1288 return false;
1289
1290 resulting_index = -1;
1291
1292 for (i=0; i<num_addrs; i++)
1293 sockets[i] = -1;
1294
1295 for (i=0; i<num_addrs; i++) {
1296 sockets[i] = socket(addrs[i].ss_family, SOCK_STREAM, 0);
1297 if (sockets[i] < 0)
1298 goto done;
1299 set_blocking(sockets[i], false);
1300 }
1301
1302 connect_again:
1303 good_connect = false;
1304
1305 for (i=0; i<num_addrs; i++) {
1306 const struct sockaddr * a =
1307 (const struct sockaddr *)&(addrs[i]);
1308
1309 if (sockets[i] == -1)
1310 continue;
1311
1312 if (sys_connect(sockets[i], a) == 0) {
1313 /* Rather unlikely as we are non-blocking, but it
1314 * might actually happen. */
1315 resulting_index = i;
1316 goto done;
1317 }
1318
1319 if (errno == EINPROGRESS || errno == EALREADY ||
1320 #ifdef EISCONN
1321 errno == EISCONN ||
1322 #endif
1323 errno == EAGAIN || errno == EINTR) {
1324 /* These are the error messages that something is
1325 progressing. */
1326 good_connect = true;
1327 } else if (errno != 0) {
1328 /* There was a direct error */
1329 close(sockets[i]);
1330 sockets[i] = -1;
1331 }
1332 }
1333
1334 if (!good_connect) {
1335 /* All of the connect's resulted in real error conditions */
1336 goto done;
1337 }
1338
1339 /* Lets see if any of the connect attempts succeeded */
1340
1341 maxfd = 0;
1342 FD_ZERO(&wr_fds);
1343 FD_ZERO(&r_fds);
1344
1345 for (i=0; i<num_addrs; i++) {
1346 if (sockets[i] == -1)
1347 continue;
1348 FD_SET(sockets[i], &wr_fds);
1349 FD_SET(sockets[i], &r_fds);
1350 if (sockets[i]>maxfd)
1351 maxfd = sockets[i];
1352 }
1353
1354 tv.tv_sec = 0;
1355 tv.tv_usec = connect_loop;
1356
1357 res = sys_select_intr(maxfd+1, &r_fds, &wr_fds, NULL, &tv);
1358
1359 if (res < 0)
1360 goto done;
1361
1362 if (res == 0)
1363 goto next_round;
1364
1365 for (i=0; i<num_addrs; i++) {
1366
1367 if (sockets[i] == -1)
1368 continue;
1369
1370 /* Stevens, Network Programming says that if there's a
1371 * successful connect, the socket is only writable. Upon an
1372 * error, it's both readable and writable. */
1373
1374 if (FD_ISSET(sockets[i], &r_fds) &&
1375 FD_ISSET(sockets[i], &wr_fds)) {
1376 /* readable and writable, so it's an error */
1377 close(sockets[i]);
1378 sockets[i] = -1;
1379 continue;
1380 }
1381
1382 if (!FD_ISSET(sockets[i], &r_fds) &&
1383 FD_ISSET(sockets[i], &wr_fds)) {
1384 /* Only writable, so it's connected */
1385 resulting_index = i;
1386 goto done;
1387 }
1388 }
1389
1390 next_round:
1391
1392 timeout -= connect_loop;
1393 if (timeout <= 0)
1394 goto done;
1395 connect_loop *= 1.5;
1396 if (connect_loop > timeout)
1397 connect_loop = timeout;
1398 goto connect_again;
1399
1400 done:
1401 for (i=0; i<num_addrs; i++) {
1402 if (i == resulting_index)
1403 continue;
1404 if (sockets[i] >= 0)
1405 close(sockets[i]);
1406 }
1407
1408 if (resulting_index >= 0) {
1409 *fd_index = resulting_index;
1410 *fd = sockets[*fd_index];
1411 set_blocking(*fd, true);
1412 }
1413
1414 free(sockets);
1415
1416 return (resulting_index >= 0);
1417 }
1418 /****************************************************************************
1419 Open a connected UDP socket to host on port
1420 **************************************************************************/
1421
1422 int open_udp_socket(const char *host, int port)
1423 {
1424 struct sockaddr_storage ss;
1425 int res;
1426
1427 if (!interpret_string_addr(&ss, host, 0)) {
1428 DEBUG(10,("open_udp_socket: can't resolve name %s\n",
1429 host));
1430 return -1;
1431 }
1432
1433 res = socket(ss.ss_family, SOCK_DGRAM, 0);
1434 if (res == -1) {
1435 return -1;
1436 }
1437
1438 #if defined(HAVE_IPV6)
1439 if (ss.ss_family == AF_INET6) {
1440 struct sockaddr_in6 *psa6;
1441 psa6 = (struct sockaddr_in6 *)&ss;
1442 psa6->sin6_port = htons(port);
1443 if (psa6->sin6_scope_id == 0
1444 && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
1445 setup_linklocal_scope_id(
1446 (struct sockaddr *)&ss);
1447 }
1448 }
1449 #endif
1450 if (ss.ss_family == AF_INET) {
1451 struct sockaddr_in *psa;
1452 psa = (struct sockaddr_in *)&ss;
1453 psa->sin_port = htons(port);
1454 }
1455
1456 if (sys_connect(res,(struct sockaddr *)&ss)) {
1457 close(res);
1458 return -1;
1459 }
1460
1461 return res;
1462 }
1463
1464 /*******************************************************************
1465 Return the IP addr of the remote end of a socket as a string.
1466 Optionally return the struct sockaddr_storage.
1467 ******************************************************************/
1468
1469 static const char *get_peer_addr_internal(int fd,
1470 char *addr_buf,
1471 size_t addr_buf_len,
1472 struct sockaddr *pss,
1473 socklen_t *plength)
1474 {
1475 struct sockaddr_storage ss;
1476 socklen_t length = sizeof(ss);
1477
1478 strlcpy(addr_buf,"0.0.0.0",addr_buf_len);
1479
1480 if (fd == -1) {
1481 return addr_buf;
1482 }
1483
1484 if (pss == NULL) {
1485 pss = (struct sockaddr *)&ss;
1486 plength = &length;
1487 }
1488
1489 if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) {
1490 DEBUG(0,("getpeername failed. Error was %s\n",
1491 strerror(errno) ));
1492 return addr_buf;
1493 }
1494
1495 print_sockaddr_len(addr_buf,
1496 addr_buf_len,
1497 pss,
1498 *plength);
1499 return addr_buf;
1500 }
1501
1502 /*******************************************************************
1503 Matchname - determine if host name matches IP address. Used to
1504 confirm a hostname lookup to prevent spoof attacks.
1505 ******************************************************************/
1506
1507 static bool matchname(const char *remotehost,
1508 const struct sockaddr *pss,
1509 socklen_t len)
1510 {
1511 struct addrinfo *res = NULL;
1512 struct addrinfo *ailist = NULL;
1513 char addr_buf[INET6_ADDRSTRLEN];
1514 bool ret = interpret_string_addr_internal(&ailist,
1515 remotehost,
1516 AI_ADDRCONFIG|AI_CANONNAME);
1517
1518 if (!ret || ailist == NULL) {
1519 DEBUG(3,("matchname: getaddrinfo failed for "
1520 "name %s [%s]\n",
1521 remotehost,
1522 gai_strerror(ret) ));
1523 return false;
1524 }
1525
1526 /*
1527 * Make sure that getaddrinfo() returns the "correct" host name.
1528 */
1529
1530 if (ailist->ai_canonname == NULL ||
1531 (!strequal(remotehost, ailist->ai_canonname) &&
1532 !strequal(remotehost, "localhost"))) {
1533 DEBUG(0,("matchname: host name/name mismatch: %s != %s\n",
1534 remotehost,
1535 ailist->ai_canonname ?
1536 ailist->ai_canonname : "(NULL)"));
1537 freeaddrinfo(ailist);
1538 return false;
1539 }
1540
1541 /* Look up the host address in the address list we just got. */
1542 for (res = ailist; res; res = res->ai_next) {
1543 if (!res->ai_addr) {
1544 continue;
1545 }
1546 if (sockaddr_equal((const struct sockaddr *)res->ai_addr,
1547 (struct sockaddr *)pss)) {
1548 freeaddrinfo(ailist);
1549 return true;
1550 }
1551 }
1552
1553 /*
1554 * The host name does not map to the original host address. Perhaps
1555 * someone has compromised a name server. More likely someone botched
1556 * it, but that could be dangerous, too.
1557 */
1558
1559 DEBUG(0,("matchname: host name/address mismatch: %s != %s\n",
1560 print_sockaddr_len(addr_buf,
1561 sizeof(addr_buf),
1562 pss,
1563 len),
1564 ailist->ai_canonname ? ailist->ai_canonname : "(NULL)"));
1565
1566 if (ailist) {
1567 freeaddrinfo(ailist);
1568 }
1569 return false;
1570 }
1571
1572 /*******************************************************************
1573 Deal with the singleton cache.
1574 ******************************************************************/
1575
1576 struct name_addr_pair {
1577 struct sockaddr_storage ss;
1578 const char *name;
1579 };
1580
1581 /*******************************************************************
1582 Lookup a name/addr pair. Returns memory allocated from memcache.
1583 ******************************************************************/
1584
1585 static bool lookup_nc(struct name_addr_pair *nc)
1586 {
1587 DATA_BLOB tmp;
1588
1589 ZERO_STRUCTP(nc);
1590
1591 if (!memcache_lookup(
1592 NULL, SINGLETON_CACHE,
1593 data_blob_string_const_null("get_peer_name"),
1594 &tmp)) {
1595 return false;
1596 }
1597
1598 memcpy(&nc->ss, tmp.data, sizeof(nc->ss));
1599 nc->name = (const char *)tmp.data + sizeof(nc->ss);
1600 return true;
1601 }
1602
1603 /*******************************************************************
1604 Save a name/addr pair.
1605 ******************************************************************/
1606
1607 static void store_nc(const struct name_addr_pair *nc)
1608 {
1609 DATA_BLOB tmp;
1610 size_t namelen = strlen(nc->name);
1611
1612 tmp = data_blob(NULL, sizeof(nc->ss) + namelen + 1);
1613 if (!tmp.data) {
1614 return;
1615 }
1616 memcpy(tmp.data, &nc->ss, sizeof(nc->ss));
1617 memcpy(tmp.data+sizeof(nc->ss), nc->name, namelen+1);
1618
1619 memcache_add(NULL, SINGLETON_CACHE,
1620 data_blob_string_const_null("get_peer_name"),
1621 tmp);
1622 data_blob_free(&tmp);
1623 }
1624
1625 /*******************************************************************
1626 Return the DNS name of the remote end of a socket.
1627 ******************************************************************/
1628
1629 const char *get_peer_name(int fd, bool force_lookup)
1630 {
1631 struct name_addr_pair nc;
1632 char addr_buf[INET6_ADDRSTRLEN];
1633 struct sockaddr_storage ss;
1634 socklen_t length = sizeof(ss);
1635 const char *p;
1636 int ret;
1637 char name_buf[MAX_DNS_NAME_LENGTH];
1638 char tmp_name[MAX_DNS_NAME_LENGTH];
1639
1640 /* reverse lookups can be *very* expensive, and in many
1641 situations won't work because many networks don't link dhcp
1642 with dns. To avoid the delay we avoid the lookup if
1643 possible */
1644 if (!lp_hostname_lookups() && (force_lookup == false)) {
1645 length = sizeof(nc.ss);
1646 nc.name = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf),
1647 (struct sockaddr *)&nc.ss, &length);
1648 store_nc(&nc);
1649 lookup_nc(&nc);
1650 return nc.name ? nc.name : "UNKNOWN";
1651 }
1652
1653 lookup_nc(&nc);
1654
1655 memset(&ss, '\0', sizeof(ss));
1656 p = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf), (struct sockaddr *)&ss, &length);
1657
1658 /* it might be the same as the last one - save some DNS work */
1659 if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&nc.ss)) {
1660 return nc.name ? nc.name : "UNKNOWN";
1661 }
1662
1663 /* Not the same. We need to lookup. */
1664 if (fd == -1) {
1665 return "UNKNOWN";
1666 }
1667
1668 /* Look up the remote host name. */
1669 ret = sys_getnameinfo((struct sockaddr *)&ss,
1670 length,
1671 name_buf,
1672 sizeof(name_buf),
1673 NULL,
1674 0,
1675 0);
1676
1677 if (ret) {
1678 DEBUG(1,("get_peer_name: getnameinfo failed "
1679 "for %s with error %s\n",
1680 p,
1681 gai_strerror(ret)));
1682 strlcpy(name_buf, p, sizeof(name_buf));
1683 } else {
1684 if (!matchname(name_buf, (struct sockaddr *)&ss, length)) {
1685 DEBUG(0,("Matchname failed on %s %s\n",name_buf,p));
1686 strlcpy(name_buf,"UNKNOWN",sizeof(name_buf));
1687 }
1688 }
1689
1690 /* can't pass the same source and dest strings in when you
1691 use --enable-developer or the clobber_region() call will
1692 get you */
1693
1694 strlcpy(tmp_name, name_buf, sizeof(tmp_name));
1695 alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
1696 if (strstr(name_buf,"..")) {
1697 strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1698 }
1699
1700 nc.name = name_buf;
1701 nc.ss = ss;
1702
1703 store_nc(&nc);
1704 lookup_nc(&nc);
1705 return nc.name ? nc.name : "UNKNOWN";
1706 }
1707
1708 /*******************************************************************
1709 Return the IP addr of the remote end of a socket as a string.
1710 ******************************************************************/
1711
1712 const char *get_peer_addr(int fd, char *addr, size_t addr_len)
1713 {
1714 return get_peer_addr_internal(fd, addr, addr_len, NULL, NULL);
1715 }
1716
1717 /*******************************************************************
1718 Create protected unix domain socket.
1719
1720 Some unixes cannot set permissions on a ux-dom-sock, so we
1721 have to make sure that the directory contains the protection
1722 permissions instead.
1723 ******************************************************************/
1724
1725 int create_pipe_sock(const char *socket_dir,
1726 const char *socket_name,
1727 mode_t dir_perms)
1728 {
1729 #ifdef HAVE_UNIXSOCKET
1730 struct sockaddr_un sunaddr;
1731 struct stat st;
1732 int sock;
1733 mode_t old_umask;
1734 char *path = NULL;
1735
1736 old_umask = umask(0);
1737
1738 /* Create the socket directory or reuse the existing one */
1739
1740 if (lstat(socket_dir, &st) == -1) {
1741 if (errno == ENOENT) {
1742 /* Create directory */
1743 if (mkdir(socket_dir, dir_perms) == -1) {
1744 DEBUG(0, ("error creating socket directory "
1745 "%s: %s\n", socket_dir,
1746 strerror(errno)));
1747 goto out_umask;
1748 }
1749 } else {
1750 DEBUG(0, ("lstat failed on socket directory %s: %s\n",
1751 socket_dir, strerror(errno)));
1752 goto out_umask;
1753 }
1754 } else {
1755 /* Check ownership and permission on existing directory */
1756 if (!S_ISDIR(st.st_mode)) {
1757 DEBUG(0, ("socket directory %s isn't a directory\n",
1758 socket_dir));
1759 goto out_umask;
1760 }
1761 if ((st.st_uid != sec_initial_uid()) ||
1762 ((st.st_mode & 0777) != dir_perms)) {
1763 DEBUG(0, ("invalid permissions on socket directory "
1764 "%s\n", socket_dir));
1765 goto out_umask;
1766 }
1767 }
1768
1769 /* Create the socket file */
1770
1771 sock = socket(AF_UNIX, SOCK_STREAM, 0);
1772
1773 if (sock == -1) {
1774 DEBUG(0, ("create_pipe_sock: socket error %s\n",
1775 strerror(errno) ));
1776 goto out_close;
1777 }
1778
1779 if (asprintf(&path, "%s/%s", socket_dir, socket_name) == -1) {
1780 goto out_close;
1781 }
1782
1783 unlink(path);
1784 memset(&sunaddr, 0, sizeof(sunaddr));
1785 sunaddr.sun_family = AF_UNIX;
1786 strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path));
1787
1788 if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1789 DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
1790 strerror(errno)));
1791 goto out_close;
1792 }
1793
1794 if (listen(sock, 5) == -1) {
1795 DEBUG(0, ("listen failed on pipe socket %s: %s\n", path,
1796 strerror(errno)));
1797 goto out_close;
1798 }
1799
1800 SAFE_FREE(path);
1801
1802 umask(old_umask);
1803 return sock;
1804
1805 out_close:
1806 SAFE_FREE(path);
1807 if (sock != -1)
1808 close(sock);
1809
1810 out_umask:
1811 umask(old_umask);
1812 return -1;
1813
1814 #else
1815 DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
1816 return -1;
1817 #endif /* HAVE_UNIXSOCKET */
1818 }
1819
1820 /****************************************************************************
1821 Get my own canonical name, including domain.
1822 ****************************************************************************/
1823
1824 const char *get_mydnsfullname(void)
1825 {
1826 struct addrinfo *res = NULL;
1827 char my_hostname[HOST_NAME_MAX];
1828 bool ret;
1829 DATA_BLOB tmp;
1830
1831 if (memcache_lookup(NULL, SINGLETON_CACHE,
1832 data_blob_string_const_null("get_mydnsfullname"),
1833 &tmp)) {
1834 SMB_ASSERT(tmp.length > 0);
1835 return (const char *)tmp.data;
1836 }
1837
1838 /* get my host name */
1839 if (gethostname(my_hostname, sizeof(my_hostname)) == -1) {
1840 DEBUG(0,("get_mydnsfullname: gethostname failed\n"));
1841 return NULL;
1842 }
1843
1844 /* Ensure null termination. */
1845 my_hostname[sizeof(my_hostname)-1] = '\0';
1846
1847 ret = interpret_string_addr_internal(&res,
1848 my_hostname,
1849 AI_ADDRCONFIG|AI_CANONNAME);
1850
1851 if (!ret || res == NULL) {
1852 DEBUG(3,("get_mydnsfullname: getaddrinfo failed for "
1853 "name %s [%s]\n",
1854 my_hostname,
1855 gai_strerror(ret) ));
1856 return NULL;
1857 }
1858
1859 /*
1860 * Make sure that getaddrinfo() returns the "correct" host name.
1861 */
1862
1863 if (res->ai_canonname == NULL) {
1864 DEBUG(3,("get_mydnsfullname: failed to get "
1865 "canonical name for %s\n",
1866 my_hostname));
1867 freeaddrinfo(res);
1868 return NULL;
1869 }
1870
1871 /* This copies the data, so we must do a lookup
1872 * afterwards to find the value to return.
1873 */
1874
1875 memcache_add(NULL, SINGLETON_CACHE,
1876 data_blob_string_const_null("get_mydnsfullname"),
1877 data_blob_string_const_null(res->ai_canonname));
1878
1879 if (!memcache_lookup(NULL, SINGLETON_CACHE,
1880 data_blob_string_const_null("get_mydnsfullname"),
1881 &tmp)) {
1882 tmp = data_blob_talloc(talloc_tos(), res->ai_canonname,
1883 strlen(res->ai_canonname) + 1);
1884 }
1885
1886 freeaddrinfo(res);
1887
1888 return (const char *)tmp.data;
1889 }
1890
1891 /************************************************************
1892 Is this my name ?
1893 ************************************************************/
1894
1895 bool is_myname_or_ipaddr(const char *s)
1896 {
1897 TALLOC_CTX *ctx = talloc_tos();
1898 char addr[INET6_ADDRSTRLEN];
1899 char *name = NULL;
1900 const char *dnsname;
1901 char *servername = NULL;
1902
1903 if (!s) {
1904 return false;
1905 }
1906
1907 /* Santize the string from '\\name' */
1908 name = talloc_strdup(ctx, s);
1909 if (!name) {
1910 return false;
1911 }
1912
1913 servername = strrchr_m(name, '\\' );
1914 if (!servername) {
1915 servername = name;
1916 } else {
1917 servername++;
1918 }
1919
1920 /* Optimize for the common case */
1921 if (strequal(servername, global_myname())) {
1922 return true;
1923 }
1924
1925 /* Check for an alias */
1926 if (is_myname(servername)) {
1927 return true;
1928 }
1929
1930 /* Check for loopback */
1931 if (strequal(servername, "127.0.0.1") ||
1932 strequal(servername, "::1")) {
1933 return true;
1934 }
1935
1936 if (strequal(servername, "localhost")) {
1937 return true;
1938 }
1939
1940 /* Maybe it's my dns name */
1941 dnsname = get_mydnsfullname();
1942 if (dnsname && strequal(servername, dnsname)) {
1943 return true;
1944 }
1945
1946 /* Handle possible CNAME records - convert to an IP addr. */
1947 if (!is_ipaddress(servername)) {
1948 /* Use DNS to resolve the name, but only the first address */
1949 struct sockaddr_storage ss;
1950 if (interpret_string_addr(&ss, servername, 0)) {
1951 print_sockaddr(addr,
1952 sizeof(addr),
1953 &ss);
1954 servername = addr;
1955 }
1956 }
1957
1958 /* Maybe its an IP address? */
1959 if (is_ipaddress(servername)) {
1960 struct sockaddr_storage ss;
1961 struct iface_struct *nics;
1962 int i, n;
1963
1964 if (!interpret_string_addr(&ss, servername, AI_NUMERICHOST)) {
1965 return false;
1966 }
1967
1968 if (ismyaddr((struct sockaddr *)&ss)) {
1969 return true;
1970 }
1971
1972 if (is_zero_addr((struct sockaddr *)&ss) ||
1973 is_loopback_addr((struct sockaddr *)&ss)) {
1974 return false;
1975 }
1976
1977 n = get_interfaces(talloc_tos(), &nics);
1978 for (i=0; i<n; i++) {
1979 if (sockaddr_equal((struct sockaddr *)&nics[i].ip, (struct sockaddr *)&ss)) {
1980 TALLOC_FREE(nics);
1981 return true;
1982 }
1983 }
1984 TALLOC_FREE(nics);
1985 }
1986
1987 /* No match */
1988 return false;
1989 }
WIP