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[Samba.git] / source3 / lib / util_sock.c
blob238daf47eeba3a8a38474aa9ff8c87fe44b20408
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 if (fd < 0 || fd >= FD_SETSIZE) {
564 errno = EBADF;
565 return map_nt_error_from_unix(EBADF);
566 }
567
568 FD_ZERO(&fds);
569 FD_SET(fd,&fds);
570
571 selrtn = sys_select_intr(fd+1,&fds,NULL,NULL,&timeout);
572
573 /* Check if error */
574 if (selrtn == -1) {
575 /* something is wrong. Maybe the socket is dead? */
576 if (fd == get_client_fd()) {
577 /* Try and give an error message saying
578 * what client failed. */
579 DEBUG(0,("read_fd_with_timeout: timeout "
580 "read for client %s. select error = %s.\n",
581 get_peer_addr(fd,addr,sizeof(addr)),
582 strerror(errno) ));
583 } else {
584 DEBUG(0,("read_fd_with_timeout: timeout "
585 "read. select error = %s.\n",
586 strerror(errno) ));
587 }
588 return map_nt_error_from_unix(errno);
589 }
590
591 /* Did we timeout ? */
592 if (selrtn == 0) {
593 DEBUG(10,("read_fd_with_timeout: timeout read. "
594 "select timed out.\n"));
595 return NT_STATUS_IO_TIMEOUT;
596 }
597
598 readret = sys_read(fd, buf+nread, maxcnt-nread);
599
600 if (readret == 0) {
601 /* we got EOF on the file descriptor */
602 DEBUG(5,("read_fd_with_timeout: timeout read. "
603 "EOF from client.\n"));
604 return NT_STATUS_END_OF_FILE;
605 }
606
607 if (readret == -1) {
608 /* the descriptor is probably dead */
609 if (fd == get_client_fd()) {
610 /* Try and give an error message
611 * saying what client failed. */
612 DEBUG(0,("read_fd_with_timeout: timeout "
613 "read to client %s. read error = %s.\n",
614 get_peer_addr(fd,addr,sizeof(addr)),
615 strerror(errno) ));
616 } else {
617 DEBUG(0,("read_fd_with_timeout: timeout "
618 "read. read error = %s.\n",
619 strerror(errno) ));
620 }
621 return map_nt_error_from_unix(errno);
622 }
623
624 nread += readret;
625 }
626
627 done:
628 /* Return the number we got */
629 if (size_ret) {
630 *size_ret = nread;
631 }
632 return NT_STATUS_OK;
633 }
634
635 /****************************************************************************
636 Read data from an fd, reading exactly N bytes.
637 NB. This can be called with a non-socket fd, don't add dependencies
638 on socket calls.
639 ****************************************************************************/
640
641 NTSTATUS read_data(int fd, char *buffer, size_t N)
642 {
643 return read_fd_with_timeout(fd, buffer, N, N, 0, NULL);
644 }
645
646 /****************************************************************************
647 Write all data from an iov array
648 NB. This can be called with a non-socket fd, don't add dependencies
649 on socket calls.
650 ****************************************************************************/
651
652 ssize_t write_data_iov(int fd, const struct iovec *orig_iov, int iovcnt)
653 {
654 int i;
655 size_t to_send;
656 ssize_t thistime;
657 size_t sent;
658 struct iovec *iov_copy, *iov;
659
660 to_send = 0;
661 for (i=0; i<iovcnt; i++) {
662 to_send += orig_iov[i].iov_len;
663 }
664
665 thistime = sys_writev(fd, orig_iov, iovcnt);
666 if ((thistime <= 0) || (thistime == to_send)) {
667 return thistime;
668 }
669 sent = thistime;
670
671 /*
672 * We could not send everything in one call. Make a copy of iov that
673 * we can mess with. We keep a copy of the array start in iov_copy for
674 * the TALLOC_FREE, because we're going to modify iov later on,
675 * discarding elements.
676 */
677
678 iov_copy = (struct iovec *)TALLOC_MEMDUP(
679 talloc_tos(), orig_iov, sizeof(struct iovec) * iovcnt);
680
681 if (iov_copy == NULL) {
682 errno = ENOMEM;
683 return -1;
684 }
685 iov = iov_copy;
686
687 while (sent < to_send) {
688 /*
689 * We have to discard "thistime" bytes from the beginning
690 * iov array, "thistime" contains the number of bytes sent
691 * via writev last.
692 */
693 while (thistime > 0) {
694 if (thistime < iov[0].iov_len) {
695 char *new_base =
696 (char *)iov[0].iov_base + thistime;
697 iov[0].iov_base = new_base;
698 iov[0].iov_len -= thistime;
699 break;
700 }
701 thistime -= iov[0].iov_len;
702 iov += 1;
703 iovcnt -= 1;
704 }
705
706 thistime = sys_writev(fd, iov, iovcnt);
707 if (thistime <= 0) {
708 break;
709 }
710 sent += thistime;
711 }
712
713 TALLOC_FREE(iov_copy);
714 return sent;
715 }
716
717 /****************************************************************************
718 Write data to a fd.
719 NB. This can be called with a non-socket fd, don't add dependencies
720 on socket calls.
721 ****************************************************************************/
722
723 ssize_t write_data(int fd, const char *buffer, size_t N)
724 {
725 ssize_t ret;
726 struct iovec iov;
727
728 iov.iov_base = CONST_DISCARD(char *, buffer);
729 iov.iov_len = N;
730
731 ret = write_data_iov(fd, &iov, 1);
732 if (ret >= 0) {
733 return ret;
734 }
735
736 if (fd == get_client_fd()) {
737 char addr[INET6_ADDRSTRLEN];
738 /*
739 * Try and give an error message saying what client failed.
740 */
741 DEBUG(0, ("write_data: write failure in writing to client %s. "
742 "Error %s\n", get_peer_addr(fd,addr,sizeof(addr)),
743 strerror(errno)));
744 } else {
745 DEBUG(0,("write_data: write failure. Error = %s\n",
746 strerror(errno) ));
747 }
748
749 return -1;
750 }
751
752 /****************************************************************************
753 Send a keepalive packet (rfc1002).
754 ****************************************************************************/
755
756 bool send_keepalive(int client)
757 {
758 unsigned char buf[4];
759
760 buf[0] = SMBkeepalive;
761 buf[1] = buf[2] = buf[3] = 0;
762
763 return(write_data(client,(char *)buf,4) == 4);
764 }
765
766 /****************************************************************************
767 Read 4 bytes of a smb packet and return the smb length of the packet.
768 Store the result in the buffer.
769 This version of the function will return a length of zero on receiving
770 a keepalive packet.
771 Timeout is in milliseconds.
772 ****************************************************************************/
773
774 NTSTATUS read_smb_length_return_keepalive(int fd, char *inbuf,
775 unsigned int timeout,
776 size_t *len)
777 {
778 int msg_type;
779 NTSTATUS status;
780
781 status = read_fd_with_timeout(fd, inbuf, 4, 4, timeout, NULL);
782
783 if (!NT_STATUS_IS_OK(status)) {
784 return status;
785 }
786
787 *len = smb_len(inbuf);
788 msg_type = CVAL(inbuf,0);
789
790 if (msg_type == SMBkeepalive) {
791 DEBUG(5,("Got keepalive packet\n"));
792 }
793
794 DEBUG(10,("got smb length of %lu\n",(unsigned long)(*len)));
795
796 return NT_STATUS_OK;
797 }
798
799 /****************************************************************************
800 Read 4 bytes of a smb packet and return the smb length of the packet.
801 Store the result in the buffer. This version of the function will
802 never return a session keepalive (length of zero).
803 Timeout is in milliseconds.
804 ****************************************************************************/
805
806 NTSTATUS read_smb_length(int fd, char *inbuf, unsigned int timeout,
807 size_t *len)
808 {
809 uint8_t msgtype = SMBkeepalive;
810
811 while (msgtype == SMBkeepalive) {
812 NTSTATUS status;
813
814 status = read_smb_length_return_keepalive(fd, inbuf, timeout,
815 len);
816 if (!NT_STATUS_IS_OK(status)) {
817 return status;
818 }
819
820 msgtype = CVAL(inbuf, 0);
821 }
822
823 DEBUG(10,("read_smb_length: got smb length of %lu\n",
824 (unsigned long)len));
825
826 return NT_STATUS_OK;
827 }
828
829 /****************************************************************************
830 Read an smb from a fd.
831 The timeout is in milliseconds.
832 This function will return on receipt of a session keepalive packet.
833 maxlen is the max number of bytes to return, not including the 4 byte
834 length. If zero it means buflen limit.
835 Doesn't check the MAC on signed packets.
836 ****************************************************************************/
837
838 NTSTATUS receive_smb_raw(int fd, char *buffer, size_t buflen, unsigned int timeout,
839 size_t maxlen, size_t *p_len)
840 {
841 size_t len;
842 NTSTATUS status;
843
844 status = read_smb_length_return_keepalive(fd,buffer,timeout,&len);
845
846 if (!NT_STATUS_IS_OK(status)) {
847 DEBUG(10, ("receive_smb_raw: %s!\n", nt_errstr(status)));
848 return status;
849 }
850
851 if (len > buflen) {
852 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
853 (unsigned long)len));
854 return NT_STATUS_INVALID_PARAMETER;
855 }
856
857 if(len > 0) {
858 if (maxlen) {
859 len = MIN(len,maxlen);
860 }
861
862 status = read_fd_with_timeout(
863 fd, buffer+4, len, len, timeout, &len);
864
865 if (!NT_STATUS_IS_OK(status)) {
866 return status;
867 }
868
869 /* not all of samba3 properly checks for packet-termination
870 * of strings. This ensures that we don't run off into
871 * empty space. */
872 SSVAL(buffer+4,len, 0);
873 }
874
875 *p_len = len;
876 return NT_STATUS_OK;
877 }
878
879 /****************************************************************************
880 Open a socket of the specified type, port, and address for incoming data.
881 ****************************************************************************/
882
883 int open_socket_in(int type,
884 uint16_t port,
885 int dlevel,
886 const struct sockaddr_storage *psock,
887 bool rebind)
888 {
889 struct sockaddr_storage sock;
890 int res;
891 socklen_t slen = sizeof(struct sockaddr_in);
892
893 sock = *psock;
894
895 #if defined(HAVE_IPV6)
896 if (sock.ss_family == AF_INET6) {
897 ((struct sockaddr_in6 *)&sock)->sin6_port = htons(port);
898 slen = sizeof(struct sockaddr_in6);
899 }
900 #endif
901 if (sock.ss_family == AF_INET) {
902 ((struct sockaddr_in *)&sock)->sin_port = htons(port);
903 }
904
905 res = socket(sock.ss_family, type, 0 );
906 if( res == -1 ) {
907 if( DEBUGLVL(0) ) {
908 dbgtext( "open_socket_in(): socket() call failed: " );
909 dbgtext( "%s\n", strerror( errno ) );
910 }
911 return -1;
912 }
913
914 /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
915 {
916 int val = rebind ? 1 : 0;
917 if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,
918 (char *)&val,sizeof(val)) == -1 ) {
919 if( DEBUGLVL( dlevel ) ) {
920 dbgtext( "open_socket_in(): setsockopt: " );
921 dbgtext( "SO_REUSEADDR = %s ",
922 val?"true":"false" );
923 dbgtext( "on port %d failed ", port );
924 dbgtext( "with error = %s\n", strerror(errno) );
925 }
926 }
927 #ifdef SO_REUSEPORT
928 if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,
929 (char *)&val,sizeof(val)) == -1 ) {
930 if( DEBUGLVL( dlevel ) ) {
931 dbgtext( "open_socket_in(): setsockopt: ");
932 dbgtext( "SO_REUSEPORT = %s ",
933 val?"true":"false");
934 dbgtext( "on port %d failed ", port);
935 dbgtext( "with error = %s\n", strerror(errno));
936 }
937 }
938 #endif /* SO_REUSEPORT */
939 }
940
941 /* now we've got a socket - we need to bind it */
942 if (bind(res, (struct sockaddr *)&sock, slen) == -1 ) {
943 if( DEBUGLVL(dlevel) && (port == SMB_PORT1 ||
944 port == SMB_PORT2 || port == NMB_PORT) ) {
945 char addr[INET6_ADDRSTRLEN];
946 print_sockaddr(addr, sizeof(addr),
947 &sock);
948 dbgtext( "bind failed on port %d ", port);
949 dbgtext( "socket_addr = %s.\n", addr);
950 dbgtext( "Error = %s\n", strerror(errno));
951 }
952 close(res);
953 return -1;
954 }
955
956 DEBUG( 10, ( "bind succeeded on port %d\n", port ) );
957 return( res );
958 }
959
960 struct open_socket_out_state {
961 int fd;
962 struct event_context *ev;
963 struct sockaddr_storage ss;
964 socklen_t salen;
965 uint16_t port;
966 int wait_nsec;
967 };
968
969 static void open_socket_out_connected(struct tevent_req *subreq);
970
971 static int open_socket_out_state_destructor(struct open_socket_out_state *s)
972 {
973 if (s->fd != -1) {
974 close(s->fd);
975 }
976 return 0;
977 }
978
979 /****************************************************************************
980 Create an outgoing socket. timeout is in milliseconds.
981 **************************************************************************/
982
983 struct tevent_req *open_socket_out_send(TALLOC_CTX *mem_ctx,
984 struct event_context *ev,
985 const struct sockaddr_storage *pss,
986 uint16_t port,
987 int timeout)
988 {
989 char addr[INET6_ADDRSTRLEN];
990 struct tevent_req *result, *subreq;
991 struct open_socket_out_state *state;
992 NTSTATUS status;
993
994 result = tevent_req_create(mem_ctx, &state,
995 struct open_socket_out_state);
996 if (result == NULL) {
997 return NULL;
998 }
999 state->ev = ev;
1000 state->ss = *pss;
1001 state->port = port;
1002 state->wait_nsec = 10000;
1003 state->salen = -1;
1004
1005 state->fd = socket(state->ss.ss_family, SOCK_STREAM, 0);
1006 if (state->fd == -1) {
1007 status = map_nt_error_from_unix(errno);
1008 goto post_status;
1009 }
1010 talloc_set_destructor(state, open_socket_out_state_destructor);
1011
1012 if (!tevent_req_set_endtime(
1013 result, ev, timeval_current_ofs(0, timeout*1000))) {
1014 goto fail;
1015 }
1016
1017 #if defined(HAVE_IPV6)
1018 if (pss->ss_family == AF_INET6) {
1019 struct sockaddr_in6 *psa6;
1020 psa6 = (struct sockaddr_in6 *)&state->ss;
1021 psa6->sin6_port = htons(port);
1022 if (psa6->sin6_scope_id == 0
1023 && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
1024 setup_linklocal_scope_id(
1025 (struct sockaddr *)&(state->ss));
1026 }
1027 state->salen = sizeof(struct sockaddr_in6);
1028 }
1029 #endif
1030 if (pss->ss_family == AF_INET) {
1031 struct sockaddr_in *psa;
1032 psa = (struct sockaddr_in *)&state->ss;
1033 psa->sin_port = htons(port);
1034 state->salen = sizeof(struct sockaddr_in);
1035 }
1036
1037 print_sockaddr(addr, sizeof(addr), &state->ss);
1038 DEBUG(3,("Connecting to %s at port %u\n", addr, (unsigned int)port));
1039
1040 subreq = async_connect_send(state, state->ev, state->fd,
1041 (struct sockaddr *)&state->ss,
1042 state->salen);
1043 if ((subreq == NULL)
1044 || !tevent_req_set_endtime(
1045 subreq, state->ev,
1046 timeval_current_ofs(0, state->wait_nsec))) {
1047 goto fail;
1048 }
1049 tevent_req_set_callback(subreq, open_socket_out_connected, result);
1050 return result;
1051
1052 post_status:
1053 tevent_req_nterror(result, status);
1054 return tevent_req_post(result, ev);
1055 fail:
1056 TALLOC_FREE(result);
1057 return NULL;
1058 }
1059
1060 static void open_socket_out_connected(struct tevent_req *subreq)
1061 {
1062 struct tevent_req *req =
1063 tevent_req_callback_data(subreq, struct tevent_req);
1064 struct open_socket_out_state *state =
1065 tevent_req_data(req, struct open_socket_out_state);
1066 int ret;
1067 int sys_errno;
1068
1069 ret = async_connect_recv(subreq, &sys_errno);
1070 TALLOC_FREE(subreq);
1071 if (ret == 0) {
1072 tevent_req_done(req);
1073 return;
1074 }
1075
1076 if (
1077 #ifdef ETIMEDOUT
1078 (sys_errno == ETIMEDOUT) ||
1079 #endif
1080 (sys_errno == EINPROGRESS) ||
1081 (sys_errno == EALREADY) ||
1082 (sys_errno == EAGAIN)) {
1083
1084 /*
1085 * retry
1086 */
1087
1088 if (state->wait_nsec < 250000) {
1089 state->wait_nsec *= 1.5;
1090 }
1091
1092 subreq = async_connect_send(state, state->ev, state->fd,
1093 (struct sockaddr *)&state->ss,
1094 state->salen);
1095 if (tevent_req_nomem(subreq, req)) {
1096 return;
1097 }
1098 if (!tevent_req_set_endtime(
1099 subreq, state->ev,
1100 timeval_current_ofs(0, state->wait_nsec))) {
1101 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1102 return;
1103 }
1104 tevent_req_set_callback(subreq, open_socket_out_connected, req);
1105 return;
1106 }
1107
1108 #ifdef EISCONN
1109 if (sys_errno == EISCONN) {
1110 tevent_req_done(req);
1111 return;
1112 }
1113 #endif
1114
1115 /* real error */
1116 tevent_req_nterror(req, map_nt_error_from_unix(sys_errno));
1117 }
1118
1119 NTSTATUS open_socket_out_recv(struct tevent_req *req, int *pfd)
1120 {
1121 struct open_socket_out_state *state =
1122 tevent_req_data(req, struct open_socket_out_state);
1123 NTSTATUS status;
1124
1125 if (tevent_req_is_nterror(req, &status)) {
1126 return status;
1127 }
1128 *pfd = state->fd;
1129 state->fd = -1;
1130 return NT_STATUS_OK;
1131 }
1132
1133 NTSTATUS open_socket_out(const struct sockaddr_storage *pss, uint16_t port,
1134 int timeout, int *pfd)
1135 {
1136 TALLOC_CTX *frame = talloc_stackframe();
1137 struct event_context *ev;
1138 struct tevent_req *req;
1139 NTSTATUS status = NT_STATUS_NO_MEMORY;
1140
1141 ev = event_context_init(frame);
1142 if (ev == NULL) {
1143 goto fail;
1144 }
1145
1146 req = open_socket_out_send(frame, ev, pss, port, timeout);
1147 if (req == NULL) {
1148 goto fail;
1149 }
1150 if (!tevent_req_poll(req, ev)) {
1151 status = NT_STATUS_INTERNAL_ERROR;
1152 goto fail;
1153 }
1154 status = open_socket_out_recv(req, pfd);
1155 fail:
1156 TALLOC_FREE(frame);
1157 return status;
1158 }
1159
1160 struct open_socket_out_defer_state {
1161 struct event_context *ev;
1162 struct sockaddr_storage ss;
1163 uint16_t port;
1164 int timeout;
1165 int fd;
1166 };
1167
1168 static void open_socket_out_defer_waited(struct tevent_req *subreq);
1169 static void open_socket_out_defer_connected(struct tevent_req *subreq);
1170
1171 struct tevent_req *open_socket_out_defer_send(TALLOC_CTX *mem_ctx,
1172 struct event_context *ev,
1173 struct timeval wait_time,
1174 const struct sockaddr_storage *pss,
1175 uint16_t port,
1176 int timeout)
1177 {
1178 struct tevent_req *req, *subreq;
1179 struct open_socket_out_defer_state *state;
1180
1181 req = tevent_req_create(mem_ctx, &state,
1182 struct open_socket_out_defer_state);
1183 if (req == NULL) {
1184 return NULL;
1185 }
1186 state->ev = ev;
1187 state->ss = *pss;
1188 state->port = port;
1189 state->timeout = timeout;
1190
1191 subreq = tevent_wakeup_send(
1192 state, ev,
1193 timeval_current_ofs(wait_time.tv_sec, wait_time.tv_usec));
1194 if (subreq == NULL) {
1195 goto fail;
1196 }
1197 tevent_req_set_callback(subreq, open_socket_out_defer_waited, req);
1198 return req;
1199 fail:
1200 TALLOC_FREE(req);
1201 return NULL;
1202 }
1203
1204 static void open_socket_out_defer_waited(struct tevent_req *subreq)
1205 {
1206 struct tevent_req *req = tevent_req_callback_data(
1207 subreq, struct tevent_req);
1208 struct open_socket_out_defer_state *state = tevent_req_data(
1209 req, struct open_socket_out_defer_state);
1210 bool ret;
1211
1212 ret = tevent_wakeup_recv(subreq);
1213 TALLOC_FREE(subreq);
1214 if (!ret) {
1215 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
1216 return;
1217 }
1218
1219 subreq = open_socket_out_send(state, state->ev, &state->ss,
1220 state->port, state->timeout);
1221 if (tevent_req_nomem(subreq, req)) {
1222 return;
1223 }
1224 tevent_req_set_callback(subreq, open_socket_out_defer_connected, req);
1225 }
1226
1227 static void open_socket_out_defer_connected(struct tevent_req *subreq)
1228 {
1229 struct tevent_req *req = tevent_req_callback_data(
1230 subreq, struct tevent_req);
1231 struct open_socket_out_defer_state *state = tevent_req_data(
1232 req, struct open_socket_out_defer_state);
1233 NTSTATUS status;
1234
1235 status = open_socket_out_recv(subreq, &state->fd);
1236 TALLOC_FREE(subreq);
1237 if (!NT_STATUS_IS_OK(status)) {
1238 tevent_req_nterror(req, status);
1239 return;
1240 }
1241 tevent_req_done(req);
1242 }
1243
1244 NTSTATUS open_socket_out_defer_recv(struct tevent_req *req, int *pfd)
1245 {
1246 struct open_socket_out_defer_state *state = tevent_req_data(
1247 req, struct open_socket_out_defer_state);
1248 NTSTATUS status;
1249
1250 if (tevent_req_is_nterror(req, &status)) {
1251 return status;
1252 }
1253 *pfd = state->fd;
1254 state->fd = -1;
1255 return NT_STATUS_OK;
1256 }
1257
1258 /*******************************************************************
1259 Create an outgoing TCP socket to the first addr that connects.
1260
1261 This is for simultaneous connection attempts to port 445 and 139 of a host
1262 or for simultatneous connection attempts to multiple DCs at once. We return
1263 a socket fd of the first successful connection.
1264
1265 @param[in] addrs list of Internet addresses and ports to connect to
1266 @param[in] num_addrs number of address/port pairs in the addrs list
1267 @param[in] timeout time after which we stop waiting for a socket connection
1268 to succeed, given in milliseconds
1269 @param[out] fd_index the entry in addrs which we successfully connected to
1270 @param[out] fd fd of the open and connected socket
1271 @return true on a successful connection, false if all connection attempts
1272 failed or we timed out
1273 *******************************************************************/
1274
1275 bool open_any_socket_out(struct sockaddr_storage *addrs, int num_addrs,
1276 int timeout, int *fd_index, int *fd)
1277 {
1278 int i, resulting_index, res;
1279 int *sockets;
1280 bool good_connect;
1281
1282 fd_set r_fds, wr_fds;
1283 struct timeval tv;
1284 int maxfd;
1285
1286 int connect_loop = 10000; /* 10 milliseconds */
1287
1288 timeout *= 1000; /* convert to microseconds */
1289
1290 sockets = SMB_MALLOC_ARRAY(int, num_addrs);
1291
1292 if (sockets == NULL)
1293 return false;
1294
1295 resulting_index = -1;
1296
1297 for (i=0; i<num_addrs; i++)
1298 sockets[i] = -1;
1299
1300 for (i=0; i<num_addrs; i++) {
1301 sockets[i] = socket(addrs[i].ss_family, SOCK_STREAM, 0);
1302 if (sockets[i] < 0 || sockets[i] >= FD_SETSIZE)
1303 goto done;
1304 set_blocking(sockets[i], false);
1305 }
1306
1307 connect_again:
1308 good_connect = false;
1309
1310 for (i=0; i<num_addrs; i++) {
1311 const struct sockaddr * a =
1312 (const struct sockaddr *)&(addrs[i]);
1313
1314 if (sockets[i] == -1)
1315 continue;
1316
1317 if (sys_connect(sockets[i], a) == 0) {
1318 /* Rather unlikely as we are non-blocking, but it
1319 * might actually happen. */
1320 resulting_index = i;
1321 goto done;
1322 }
1323
1324 if (errno == EINPROGRESS || errno == EALREADY ||
1325 #ifdef EISCONN
1326 errno == EISCONN ||
1327 #endif
1328 errno == EAGAIN || errno == EINTR) {
1329 /* These are the error messages that something is
1330 progressing. */
1331 good_connect = true;
1332 } else if (errno != 0) {
1333 /* There was a direct error */
1334 close(sockets[i]);
1335 sockets[i] = -1;
1336 }
1337 }
1338
1339 if (!good_connect) {
1340 /* All of the connect's resulted in real error conditions */
1341 goto done;
1342 }
1343
1344 /* Lets see if any of the connect attempts succeeded */
1345
1346 maxfd = 0;
1347 FD_ZERO(&wr_fds);
1348 FD_ZERO(&r_fds);
1349
1350 for (i=0; i<num_addrs; i++) {
1351 if (sockets[i] < 0 || sockets[i] >= FD_SETSIZE) {
1352 /* This cannot happen - ignore if so. */
1353 continue;
1354 }
1355 FD_SET(sockets[i], &wr_fds);
1356 FD_SET(sockets[i], &r_fds);
1357 if (sockets[i]>maxfd)
1358 maxfd = sockets[i];
1359 }
1360
1361 tv.tv_sec = 0;
1362 tv.tv_usec = connect_loop;
1363
1364 res = sys_select_intr(maxfd+1, &r_fds, &wr_fds, NULL, &tv);
1365
1366 if (res < 0)
1367 goto done;
1368
1369 if (res == 0)
1370 goto next_round;
1371
1372 for (i=0; i<num_addrs; i++) {
1373
1374 if (sockets[i] == -1)
1375 continue;
1376
1377 /* Stevens, Network Programming says that if there's a
1378 * successful connect, the socket is only writable. Upon an
1379 * error, it's both readable and writable. */
1380
1381 if (FD_ISSET(sockets[i], &r_fds) &&
1382 FD_ISSET(sockets[i], &wr_fds)) {
1383 /* readable and writable, so it's an error */
1384 close(sockets[i]);
1385 sockets[i] = -1;
1386 continue;
1387 }
1388
1389 if (!FD_ISSET(sockets[i], &r_fds) &&
1390 FD_ISSET(sockets[i], &wr_fds)) {
1391 /* Only writable, so it's connected */
1392 resulting_index = i;
1393 goto done;
1394 }
1395 }
1396
1397 next_round:
1398
1399 timeout -= connect_loop;
1400 if (timeout <= 0)
1401 goto done;
1402 connect_loop *= 1.5;
1403 if (connect_loop > timeout)
1404 connect_loop = timeout;
1405 goto connect_again;
1406
1407 done:
1408 for (i=0; i<num_addrs; i++) {
1409 if (i == resulting_index)
1410 continue;
1411 if (sockets[i] >= 0)
1412 close(sockets[i]);
1413 }
1414
1415 if (resulting_index >= 0) {
1416 *fd_index = resulting_index;
1417 *fd = sockets[*fd_index];
1418 set_blocking(*fd, true);
1419 }
1420
1421 free(sockets);
1422
1423 return (resulting_index >= 0);
1424 }
1425 /****************************************************************************
1426 Open a connected UDP socket to host on port
1427 **************************************************************************/
1428
1429 int open_udp_socket(const char *host, int port)
1430 {
1431 struct sockaddr_storage ss;
1432 int res;
1433
1434 if (!interpret_string_addr(&ss, host, 0)) {
1435 DEBUG(10,("open_udp_socket: can't resolve name %s\n",
1436 host));
1437 return -1;
1438 }
1439
1440 res = socket(ss.ss_family, SOCK_DGRAM, 0);
1441 if (res == -1) {
1442 return -1;
1443 }
1444
1445 #if defined(HAVE_IPV6)
1446 if (ss.ss_family == AF_INET6) {
1447 struct sockaddr_in6 *psa6;
1448 psa6 = (struct sockaddr_in6 *)&ss;
1449 psa6->sin6_port = htons(port);
1450 if (psa6->sin6_scope_id == 0
1451 && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
1452 setup_linklocal_scope_id(
1453 (struct sockaddr *)&ss);
1454 }
1455 }
1456 #endif
1457 if (ss.ss_family == AF_INET) {
1458 struct sockaddr_in *psa;
1459 psa = (struct sockaddr_in *)&ss;
1460 psa->sin_port = htons(port);
1461 }
1462
1463 if (sys_connect(res,(struct sockaddr *)&ss)) {
1464 close(res);
1465 return -1;
1466 }
1467
1468 return res;
1469 }
1470
1471 /*******************************************************************
1472 Return the IP addr of the remote end of a socket as a string.
1473 Optionally return the struct sockaddr_storage.
1474 ******************************************************************/
1475
1476 static const char *get_peer_addr_internal(int fd,
1477 char *addr_buf,
1478 size_t addr_buf_len,
1479 struct sockaddr *pss,
1480 socklen_t *plength)
1481 {
1482 struct sockaddr_storage ss;
1483 socklen_t length = sizeof(ss);
1484
1485 strlcpy(addr_buf,"0.0.0.0",addr_buf_len);
1486
1487 if (fd == -1) {
1488 return addr_buf;
1489 }
1490
1491 if (pss == NULL) {
1492 pss = (struct sockaddr *)&ss;
1493 plength = &length;
1494 }
1495
1496 if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) {
1497 DEBUG(0,("getpeername failed. Error was %s\n",
1498 strerror(errno) ));
1499 return addr_buf;
1500 }
1501
1502 print_sockaddr_len(addr_buf,
1503 addr_buf_len,
1504 pss,
1505 *plength);
1506 return addr_buf;
1507 }
1508
1509 /*******************************************************************
1510 Matchname - determine if host name matches IP address. Used to
1511 confirm a hostname lookup to prevent spoof attacks.
1512 ******************************************************************/
1513
1514 static bool matchname(const char *remotehost,
1515 const struct sockaddr *pss,
1516 socklen_t len)
1517 {
1518 struct addrinfo *res = NULL;
1519 struct addrinfo *ailist = NULL;
1520 char addr_buf[INET6_ADDRSTRLEN];
1521 bool ret = interpret_string_addr_internal(&ailist,
1522 remotehost,
1523 AI_ADDRCONFIG|AI_CANONNAME);
1524
1525 if (!ret || ailist == NULL) {
1526 DEBUG(3,("matchname: getaddrinfo failed for "
1527 "name %s [%s]\n",
1528 remotehost,
1529 gai_strerror(ret) ));
1530 return false;
1531 }
1532
1533 /*
1534 * Make sure that getaddrinfo() returns the "correct" host name.
1535 */
1536
1537 if (ailist->ai_canonname == NULL ||
1538 (!strequal(remotehost, ailist->ai_canonname) &&
1539 !strequal(remotehost, "localhost"))) {
1540 DEBUG(0,("matchname: host name/name mismatch: %s != %s\n",
1541 remotehost,
1542 ailist->ai_canonname ?
1543 ailist->ai_canonname : "(NULL)"));
1544 freeaddrinfo(ailist);
1545 return false;
1546 }
1547
1548 /* Look up the host address in the address list we just got. */
1549 for (res = ailist; res; res = res->ai_next) {
1550 if (!res->ai_addr) {
1551 continue;
1552 }
1553 if (sockaddr_equal((const struct sockaddr *)res->ai_addr,
1554 (struct sockaddr *)pss)) {
1555 freeaddrinfo(ailist);
1556 return true;
1557 }
1558 }
1559
1560 /*
1561 * The host name does not map to the original host address. Perhaps
1562 * someone has compromised a name server. More likely someone botched
1563 * it, but that could be dangerous, too.
1564 */
1565
1566 DEBUG(0,("matchname: host name/address mismatch: %s != %s\n",
1567 print_sockaddr_len(addr_buf,
1568 sizeof(addr_buf),
1569 pss,
1570 len),
1571 ailist->ai_canonname ? ailist->ai_canonname : "(NULL)"));
1572
1573 if (ailist) {
1574 freeaddrinfo(ailist);
1575 }
1576 return false;
1577 }
1578
1579 /*******************************************************************
1580 Deal with the singleton cache.
1581 ******************************************************************/
1582
1583 struct name_addr_pair {
1584 struct sockaddr_storage ss;
1585 const char *name;
1586 };
1587
1588 /*******************************************************************
1589 Lookup a name/addr pair. Returns memory allocated from memcache.
1590 ******************************************************************/
1591
1592 static bool lookup_nc(struct name_addr_pair *nc)
1593 {
1594 DATA_BLOB tmp;
1595
1596 ZERO_STRUCTP(nc);
1597
1598 if (!memcache_lookup(
1599 NULL, SINGLETON_CACHE,
1600 data_blob_string_const_null("get_peer_name"),
1601 &tmp)) {
1602 return false;
1603 }
1604
1605 memcpy(&nc->ss, tmp.data, sizeof(nc->ss));
1606 nc->name = (const char *)tmp.data + sizeof(nc->ss);
1607 return true;
1608 }
1609
1610 /*******************************************************************
1611 Save a name/addr pair.
1612 ******************************************************************/
1613
1614 static void store_nc(const struct name_addr_pair *nc)
1615 {
1616 DATA_BLOB tmp;
1617 size_t namelen = strlen(nc->name);
1618
1619 tmp = data_blob(NULL, sizeof(nc->ss) + namelen + 1);
1620 if (!tmp.data) {
1621 return;
1622 }
1623 memcpy(tmp.data, &nc->ss, sizeof(nc->ss));
1624 memcpy(tmp.data+sizeof(nc->ss), nc->name, namelen+1);
1625
1626 memcache_add(NULL, SINGLETON_CACHE,
1627 data_blob_string_const_null("get_peer_name"),
1628 tmp);
1629 data_blob_free(&tmp);
1630 }
1631
1632 /*******************************************************************
1633 Return the DNS name of the remote end of a socket.
1634 ******************************************************************/
1635
1636 const char *get_peer_name(int fd, bool force_lookup)
1637 {
1638 struct name_addr_pair nc;
1639 char addr_buf[INET6_ADDRSTRLEN];
1640 struct sockaddr_storage ss;
1641 socklen_t length = sizeof(ss);
1642 const char *p;
1643 int ret;
1644 char name_buf[MAX_DNS_NAME_LENGTH];
1645 char tmp_name[MAX_DNS_NAME_LENGTH];
1646
1647 /* reverse lookups can be *very* expensive, and in many
1648 situations won't work because many networks don't link dhcp
1649 with dns. To avoid the delay we avoid the lookup if
1650 possible */
1651 if (!lp_hostname_lookups() && (force_lookup == false)) {
1652 length = sizeof(nc.ss);
1653 nc.name = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf),
1654 (struct sockaddr *)&nc.ss, &length);
1655 store_nc(&nc);
1656 lookup_nc(&nc);
1657 return nc.name ? nc.name : "UNKNOWN";
1658 }
1659
1660 lookup_nc(&nc);
1661
1662 memset(&ss, '\0', sizeof(ss));
1663 p = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf), (struct sockaddr *)&ss, &length);
1664
1665 /* it might be the same as the last one - save some DNS work */
1666 if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&nc.ss)) {
1667 return nc.name ? nc.name : "UNKNOWN";
1668 }
1669
1670 /* Not the same. We need to lookup. */
1671 if (fd == -1) {
1672 return "UNKNOWN";
1673 }
1674
1675 /* Look up the remote host name. */
1676 ret = sys_getnameinfo((struct sockaddr *)&ss,
1677 length,
1678 name_buf,
1679 sizeof(name_buf),
1680 NULL,
1681 0,
1682 0);
1683
1684 if (ret) {
1685 DEBUG(1,("get_peer_name: getnameinfo failed "
1686 "for %s with error %s\n",
1687 p,
1688 gai_strerror(ret)));
1689 strlcpy(name_buf, p, sizeof(name_buf));
1690 } else {
1691 if (!matchname(name_buf, (struct sockaddr *)&ss, length)) {
1692 DEBUG(0,("Matchname failed on %s %s\n",name_buf,p));
1693 strlcpy(name_buf,"UNKNOWN",sizeof(name_buf));
1694 }
1695 }
1696
1697 /* can't pass the same source and dest strings in when you
1698 use --enable-developer or the clobber_region() call will
1699 get you */
1700
1701 strlcpy(tmp_name, name_buf, sizeof(tmp_name));
1702 alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
1703 if (strstr(name_buf,"..")) {
1704 strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1705 }
1706
1707 nc.name = name_buf;
1708 nc.ss = ss;
1709
1710 store_nc(&nc);
1711 lookup_nc(&nc);
1712 return nc.name ? nc.name : "UNKNOWN";
1713 }
1714
1715 /*******************************************************************
1716 Return the IP addr of the remote end of a socket as a string.
1717 ******************************************************************/
1718
1719 const char *get_peer_addr(int fd, char *addr, size_t addr_len)
1720 {
1721 return get_peer_addr_internal(fd, addr, addr_len, NULL, NULL);
1722 }
1723
1724 /*******************************************************************
1725 Create protected unix domain socket.
1726
1727 Some unixes cannot set permissions on a ux-dom-sock, so we
1728 have to make sure that the directory contains the protection
1729 permissions instead.
1730 ******************************************************************/
1731
1732 int create_pipe_sock(const char *socket_dir,
1733 const char *socket_name,
1734 mode_t dir_perms)
1735 {
1736 #ifdef HAVE_UNIXSOCKET
1737 struct sockaddr_un sunaddr;
1738 struct stat st;
1739 int sock;
1740 mode_t old_umask;
1741 char *path = NULL;
1742
1743 old_umask = umask(0);
1744
1745 /* Create the socket directory or reuse the existing one */
1746
1747 if (lstat(socket_dir, &st) == -1) {
1748 if (errno == ENOENT) {
1749 /* Create directory */
1750 if (mkdir(socket_dir, dir_perms) == -1) {
1751 DEBUG(0, ("error creating socket directory "
1752 "%s: %s\n", socket_dir,
1753 strerror(errno)));
1754 goto out_umask;
1755 }
1756 } else {
1757 DEBUG(0, ("lstat failed on socket directory %s: %s\n",
1758 socket_dir, strerror(errno)));
1759 goto out_umask;
1760 }
1761 } else {
1762 /* Check ownership and permission on existing directory */
1763 if (!S_ISDIR(st.st_mode)) {
1764 DEBUG(0, ("socket directory %s isn't a directory\n",
1765 socket_dir));
1766 goto out_umask;
1767 }
1768 if ((st.st_uid != sec_initial_uid()) ||
1769 ((st.st_mode & 0777) != dir_perms)) {
1770 DEBUG(0, ("invalid permissions on socket directory "
1771 "%s\n", socket_dir));
1772 goto out_umask;
1773 }
1774 }
1775
1776 /* Create the socket file */
1777
1778 sock = socket(AF_UNIX, SOCK_STREAM, 0);
1779
1780 if (sock == -1) {
1781 DEBUG(0, ("create_pipe_sock: socket error %s\n",
1782 strerror(errno) ));
1783 goto out_close;
1784 }
1785
1786 if (asprintf(&path, "%s/%s", socket_dir, socket_name) == -1) {
1787 goto out_close;
1788 }
1789
1790 unlink(path);
1791 memset(&sunaddr, 0, sizeof(sunaddr));
1792 sunaddr.sun_family = AF_UNIX;
1793 strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path));
1794
1795 if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1796 DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
1797 strerror(errno)));
1798 goto out_close;
1799 }
1800
1801 if (listen(sock, 5) == -1) {
1802 DEBUG(0, ("listen failed on pipe socket %s: %s\n", path,
1803 strerror(errno)));
1804 goto out_close;
1805 }
1806
1807 SAFE_FREE(path);
1808
1809 umask(old_umask);
1810 return sock;
1811
1812 out_close:
1813 SAFE_FREE(path);
1814 if (sock != -1)
1815 close(sock);
1816
1817 out_umask:
1818 umask(old_umask);
1819 return -1;
1820
1821 #else
1822 DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
1823 return -1;
1824 #endif /* HAVE_UNIXSOCKET */
1825 }
1826
1827 /****************************************************************************
1828 Get my own canonical name, including domain.
1829 ****************************************************************************/
1830
1831 const char *get_mydnsfullname(void)
1832 {
1833 struct addrinfo *res = NULL;
1834 char my_hostname[HOST_NAME_MAX];
1835 bool ret;
1836 DATA_BLOB tmp;
1837
1838 if (memcache_lookup(NULL, SINGLETON_CACHE,
1839 data_blob_string_const_null("get_mydnsfullname"),
1840 &tmp)) {
1841 SMB_ASSERT(tmp.length > 0);
1842 return (const char *)tmp.data;
1843 }
1844
1845 /* get my host name */
1846 if (gethostname(my_hostname, sizeof(my_hostname)) == -1) {
1847 DEBUG(0,("get_mydnsfullname: gethostname failed\n"));
1848 return NULL;
1849 }
1850
1851 /* Ensure null termination. */
1852 my_hostname[sizeof(my_hostname)-1] = '\0';
1853
1854 ret = interpret_string_addr_internal(&res,
1855 my_hostname,
1856 AI_ADDRCONFIG|AI_CANONNAME);
1857
1858 if (!ret || res == NULL) {
1859 DEBUG(3,("get_mydnsfullname: getaddrinfo failed for "
1860 "name %s [%s]\n",
1861 my_hostname,
1862 gai_strerror(ret) ));
1863 return NULL;
1864 }
1865
1866 /*
1867 * Make sure that getaddrinfo() returns the "correct" host name.
1868 */
1869
1870 if (res->ai_canonname == NULL) {
1871 DEBUG(3,("get_mydnsfullname: failed to get "
1872 "canonical name for %s\n",
1873 my_hostname));
1874 freeaddrinfo(res);
1875 return NULL;
1876 }
1877
1878 /* This copies the data, so we must do a lookup
1879 * afterwards to find the value to return.
1880 */
1881
1882 memcache_add(NULL, SINGLETON_CACHE,
1883 data_blob_string_const_null("get_mydnsfullname"),
1884 data_blob_string_const_null(res->ai_canonname));
1885
1886 if (!memcache_lookup(NULL, SINGLETON_CACHE,
1887 data_blob_string_const_null("get_mydnsfullname"),
1888 &tmp)) {
1889 tmp = data_blob_talloc(talloc_tos(), res->ai_canonname,
1890 strlen(res->ai_canonname) + 1);
1891 }
1892
1893 freeaddrinfo(res);
1894
1895 return (const char *)tmp.data;
1896 }
1897
1898 /************************************************************
1899 Is this my name ?
1900 ************************************************************/
1901
1902 bool is_myname_or_ipaddr(const char *s)
1903 {
1904 TALLOC_CTX *ctx = talloc_tos();
1905 char addr[INET6_ADDRSTRLEN];
1906 char *name = NULL;
1907 const char *dnsname;
1908 char *servername = NULL;
1909
1910 if (!s) {
1911 return false;
1912 }
1913
1914 /* Santize the string from '\\name' */
1915 name = talloc_strdup(ctx, s);
1916 if (!name) {
1917 return false;
1918 }
1919
1920 servername = strrchr_m(name, '\\' );
1921 if (!servername) {
1922 servername = name;
1923 } else {
1924 servername++;
1925 }
1926
1927 /* Optimize for the common case */
1928 if (strequal(servername, global_myname())) {
1929 return true;
1930 }
1931
1932 /* Check for an alias */
1933 if (is_myname(servername)) {
1934 return true;
1935 }
1936
1937 /* Check for loopback */
1938 if (strequal(servername, "127.0.0.1") ||
1939 strequal(servername, "::1")) {
1940 return true;
1941 }
1942
1943 if (strequal(servername, "localhost")) {
1944 return true;
1945 }
1946
1947 /* Maybe it's my dns name */
1948 dnsname = get_mydnsfullname();
1949 if (dnsname && strequal(servername, dnsname)) {
1950 return true;
1951 }
1952
1953 /* Handle possible CNAME records - convert to an IP addr. */
1954 if (!is_ipaddress(servername)) {
1955 /* Use DNS to resolve the name, but only the first address */
1956 struct sockaddr_storage ss;
1957 if (interpret_string_addr(&ss, servername, 0)) {
1958 print_sockaddr(addr,
1959 sizeof(addr),
1960 &ss);
1961 servername = addr;
1962 }
1963 }
1964
1965 /* Maybe its an IP address? */
1966 if (is_ipaddress(servername)) {
1967 struct sockaddr_storage ss;
1968 struct iface_struct *nics;
1969 int i, n;
1970
1971 if (!interpret_string_addr(&ss, servername, AI_NUMERICHOST)) {
1972 return false;
1973 }
1974
1975 if (ismyaddr((struct sockaddr *)&ss)) {
1976 return true;
1977 }
1978
1979 if (is_zero_addr((struct sockaddr *)&ss) ||
1980 is_loopback_addr((struct sockaddr *)&ss)) {
1981 return false;
1982 }
1983
1984 n = get_interfaces(talloc_tos(), &nics);
1985 for (i=0; i<n; i++) {
1986 if (sockaddr_equal((struct sockaddr *)&nics[i].ip, (struct sockaddr *)&ss)) {
1987 TALLOC_FREE(nics);
1988 return true;
1989 }
1990 }
1991 TALLOC_FREE(nics);
1992 }
1993
1994 /* No match */
1995 return false;
1996 }
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