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Depend on newer talloc for Samba 4 in the merged build as well.
[Samba.git] / source3 / lib / util_sock.c
blobde5b232aac7eba495a31d4d285061c176c41dc91
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 socket 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 ****************************************************************************/
498
499 NTSTATUS read_socket_with_timeout(int fd, char *buf,
500 size_t mincnt, size_t maxcnt,
501 unsigned int time_out,
502 size_t *size_ret)
503 {
504 fd_set fds;
505 int selrtn;
506 ssize_t readret;
507 size_t nread = 0;
508 struct timeval timeout;
509 char addr[INET6_ADDRSTRLEN];
510
511 /* just checking .... */
512 if (maxcnt <= 0)
513 return NT_STATUS_OK;
514
515 /* Blocking read */
516 if (time_out == 0) {
517 if (mincnt == 0) {
518 mincnt = maxcnt;
519 }
520
521 while (nread < mincnt) {
522 readret = sys_read(fd, buf + nread, maxcnt - nread);
523
524 if (readret == 0) {
525 DEBUG(5,("read_socket_with_timeout: "
526 "blocking read. EOF from client.\n"));
527 return NT_STATUS_END_OF_FILE;
528 }
529
530 if (readret == -1) {
531 if (fd == get_client_fd()) {
532 /* Try and give an error message
533 * saying what client failed. */
534 DEBUG(0,("read_socket_with_timeout: "
535 "client %s read error = %s.\n",
536 get_peer_addr(fd,addr,sizeof(addr)),
537 strerror(errno) ));
538 } else {
539 DEBUG(0,("read_socket_with_timeout: "
540 "read error = %s.\n",
541 strerror(errno) ));
542 }
543 return map_nt_error_from_unix(errno);
544 }
545 nread += readret;
546 }
547 goto done;
548 }
549
550 /* Most difficult - timeout read */
551 /* If this is ever called on a disk file and
552 mincnt is greater then the filesize then
553 system performance will suffer severely as
554 select always returns true on disk files */
555
556 /* Set initial timeout */
557 timeout.tv_sec = (time_t)(time_out / 1000);
558 timeout.tv_usec = (long)(1000 * (time_out % 1000));
559
560 for (nread=0; nread < mincnt; ) {
561 FD_ZERO(&fds);
562 FD_SET(fd,&fds);
563
564 selrtn = sys_select_intr(fd+1,&fds,NULL,NULL,&timeout);
565
566 /* Check if error */
567 if (selrtn == -1) {
568 /* something is wrong. Maybe the socket is dead? */
569 if (fd == get_client_fd()) {
570 /* Try and give an error message saying
571 * what client failed. */
572 DEBUG(0,("read_socket_with_timeout: timeout "
573 "read for client %s. select error = %s.\n",
574 get_peer_addr(fd,addr,sizeof(addr)),
575 strerror(errno) ));
576 } else {
577 DEBUG(0,("read_socket_with_timeout: timeout "
578 "read. select error = %s.\n",
579 strerror(errno) ));
580 }
581 return map_nt_error_from_unix(errno);
582 }
583
584 /* Did we timeout ? */
585 if (selrtn == 0) {
586 DEBUG(10,("read_socket_with_timeout: timeout read. "
587 "select timed out.\n"));
588 return NT_STATUS_IO_TIMEOUT;
589 }
590
591 readret = sys_read(fd, buf+nread, maxcnt-nread);
592
593 if (readret == 0) {
594 /* we got EOF on the file descriptor */
595 DEBUG(5,("read_socket_with_timeout: timeout read. "
596 "EOF from client.\n"));
597 return NT_STATUS_END_OF_FILE;
598 }
599
600 if (readret == -1) {
601 /* the descriptor is probably dead */
602 if (fd == get_client_fd()) {
603 /* Try and give an error message
604 * saying what client failed. */
605 DEBUG(0,("read_socket_with_timeout: timeout "
606 "read to client %s. read error = %s.\n",
607 get_peer_addr(fd,addr,sizeof(addr)),
608 strerror(errno) ));
609 } else {
610 DEBUG(0,("read_socket_with_timeout: timeout "
611 "read. read error = %s.\n",
612 strerror(errno) ));
613 }
614 return map_nt_error_from_unix(errno);
615 }
616
617 nread += readret;
618 }
619
620 done:
621 /* Return the number we got */
622 if (size_ret) {
623 *size_ret = nread;
624 }
625 return NT_STATUS_OK;
626 }
627
628 /****************************************************************************
629 Read data from the client, reading exactly N bytes.
630 ****************************************************************************/
631
632 NTSTATUS read_data(int fd, char *buffer, size_t N)
633 {
634 return read_socket_with_timeout(fd, buffer, N, N, 0, NULL);
635 }
636
637 /****************************************************************************
638 Write all data from an iov array
639 ****************************************************************************/
640
641 ssize_t write_data_iov(int fd, const struct iovec *orig_iov, int iovcnt)
642 {
643 int i;
644 size_t to_send;
645 ssize_t thistime;
646 size_t sent;
647 struct iovec *iov_copy, *iov;
648
649 to_send = 0;
650 for (i=0; i<iovcnt; i++) {
651 to_send += orig_iov[i].iov_len;
652 }
653
654 thistime = sys_writev(fd, orig_iov, iovcnt);
655 if ((thistime <= 0) || (thistime == to_send)) {
656 return thistime;
657 }
658 sent = thistime;
659
660 /*
661 * We could not send everything in one call. Make a copy of iov that
662 * we can mess with. We keep a copy of the array start in iov_copy for
663 * the TALLOC_FREE, because we're going to modify iov later on,
664 * discarding elements.
665 */
666
667 iov_copy = (struct iovec *)TALLOC_MEMDUP(
668 talloc_tos(), orig_iov, sizeof(struct iovec) * iovcnt);
669
670 if (iov_copy == NULL) {
671 errno = ENOMEM;
672 return -1;
673 }
674 iov = iov_copy;
675
676 while (sent < to_send) {
677 /*
678 * We have to discard "thistime" bytes from the beginning
679 * iov array, "thistime" contains the number of bytes sent
680 * via writev last.
681 */
682 while (thistime > 0) {
683 if (thistime < iov[0].iov_len) {
684 char *new_base =
685 (char *)iov[0].iov_base + thistime;
686 iov[0].iov_base = new_base;
687 iov[0].iov_len -= thistime;
688 break;
689 }
690 thistime -= iov[0].iov_len;
691 iov += 1;
692 iovcnt -= 1;
693 }
694
695 thistime = sys_writev(fd, iov, iovcnt);
696 if (thistime <= 0) {
697 break;
698 }
699 sent += thistime;
700 }
701
702 TALLOC_FREE(iov_copy);
703 return sent;
704 }
705
706 /****************************************************************************
707 Write data to a fd.
708 ****************************************************************************/
709
710 ssize_t write_data(int fd, const char *buffer, size_t N)
711 {
712 ssize_t ret;
713 struct iovec iov;
714
715 iov.iov_base = CONST_DISCARD(char *, buffer);
716 iov.iov_len = N;
717
718 ret = write_data_iov(fd, &iov, 1);
719 if (ret >= 0) {
720 return ret;
721 }
722
723 if (fd == get_client_fd()) {
724 char addr[INET6_ADDRSTRLEN];
725 /*
726 * Try and give an error message saying what client failed.
727 */
728 DEBUG(0, ("write_data: write failure in writing to client %s. "
729 "Error %s\n", get_peer_addr(fd,addr,sizeof(addr)),
730 strerror(errno)));
731 } else {
732 DEBUG(0,("write_data: write failure. Error = %s\n",
733 strerror(errno) ));
734 }
735
736 return -1;
737 }
738
739 /****************************************************************************
740 Send a keepalive packet (rfc1002).
741 ****************************************************************************/
742
743 bool send_keepalive(int client)
744 {
745 unsigned char buf[4];
746
747 buf[0] = SMBkeepalive;
748 buf[1] = buf[2] = buf[3] = 0;
749
750 return(write_data(client,(char *)buf,4) == 4);
751 }
752
753 /****************************************************************************
754 Read 4 bytes of a smb packet and return the smb length of the packet.
755 Store the result in the buffer.
756 This version of the function will return a length of zero on receiving
757 a keepalive packet.
758 Timeout is in milliseconds.
759 ****************************************************************************/
760
761 NTSTATUS read_smb_length_return_keepalive(int fd, char *inbuf,
762 unsigned int timeout,
763 size_t *len)
764 {
765 int msg_type;
766 NTSTATUS status;
767
768 status = read_socket_with_timeout(fd, inbuf, 4, 4, timeout, NULL);
769
770 if (!NT_STATUS_IS_OK(status)) {
771 return status;
772 }
773
774 *len = smb_len(inbuf);
775 msg_type = CVAL(inbuf,0);
776
777 if (msg_type == SMBkeepalive) {
778 DEBUG(5,("Got keepalive packet\n"));
779 }
780
781 DEBUG(10,("got smb length of %lu\n",(unsigned long)(*len)));
782
783 return NT_STATUS_OK;
784 }
785
786 /****************************************************************************
787 Read 4 bytes of a smb packet and return the smb length of the packet.
788 Store the result in the buffer. This version of the function will
789 never return a session keepalive (length of zero).
790 Timeout is in milliseconds.
791 ****************************************************************************/
792
793 NTSTATUS read_smb_length(int fd, char *inbuf, unsigned int timeout,
794 size_t *len)
795 {
796 uint8_t msgtype = SMBkeepalive;
797
798 while (msgtype == SMBkeepalive) {
799 NTSTATUS status;
800
801 status = read_smb_length_return_keepalive(fd, inbuf, timeout,
802 len);
803 if (!NT_STATUS_IS_OK(status)) {
804 return status;
805 }
806
807 msgtype = CVAL(inbuf, 0);
808 }
809
810 DEBUG(10,("read_smb_length: got smb length of %lu\n",
811 (unsigned long)len));
812
813 return NT_STATUS_OK;
814 }
815
816 /****************************************************************************
817 Read an smb from a fd.
818 The timeout is in milliseconds.
819 This function will return on receipt of a session keepalive packet.
820 maxlen is the max number of bytes to return, not including the 4 byte
821 length. If zero it means buflen limit.
822 Doesn't check the MAC on signed packets.
823 ****************************************************************************/
824
825 NTSTATUS receive_smb_raw(int fd, char *buffer, size_t buflen, unsigned int timeout,
826 size_t maxlen, size_t *p_len)
827 {
828 size_t len;
829 NTSTATUS status;
830
831 status = read_smb_length_return_keepalive(fd,buffer,timeout,&len);
832
833 if (!NT_STATUS_IS_OK(status)) {
834 DEBUG(10, ("receive_smb_raw: %s!\n", nt_errstr(status)));
835 return status;
836 }
837
838 if (len > buflen) {
839 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
840 (unsigned long)len));
841 return NT_STATUS_INVALID_PARAMETER;
842 }
843
844 if(len > 0) {
845 if (maxlen) {
846 len = MIN(len,maxlen);
847 }
848
849 status = read_socket_with_timeout(
850 fd, buffer+4, len, len, timeout, &len);
851
852 if (!NT_STATUS_IS_OK(status)) {
853 return status;
854 }
855
856 /* not all of samba3 properly checks for packet-termination
857 * of strings. This ensures that we don't run off into
858 * empty space. */
859 SSVAL(buffer+4,len, 0);
860 }
861
862 *p_len = len;
863 return NT_STATUS_OK;
864 }
865
866 /****************************************************************************
867 Open a socket of the specified type, port, and address for incoming data.
868 ****************************************************************************/
869
870 int open_socket_in(int type,
871 uint16_t port,
872 int dlevel,
873 const struct sockaddr_storage *psock,
874 bool rebind)
875 {
876 struct sockaddr_storage sock;
877 int res;
878 socklen_t slen = sizeof(struct sockaddr_in);
879
880 sock = *psock;
881
882 #if defined(HAVE_IPV6)
883 if (sock.ss_family == AF_INET6) {
884 ((struct sockaddr_in6 *)&sock)->sin6_port = htons(port);
885 slen = sizeof(struct sockaddr_in6);
886 }
887 #endif
888 if (sock.ss_family == AF_INET) {
889 ((struct sockaddr_in *)&sock)->sin_port = htons(port);
890 }
891
892 res = socket(sock.ss_family, type, 0 );
893 if( res == -1 ) {
894 if( DEBUGLVL(0) ) {
895 dbgtext( "open_socket_in(): socket() call failed: " );
896 dbgtext( "%s\n", strerror( errno ) );
897 }
898 return -1;
899 }
900
901 /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
902 {
903 int val = rebind ? 1 : 0;
904 if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,
905 (char *)&val,sizeof(val)) == -1 ) {
906 if( DEBUGLVL( dlevel ) ) {
907 dbgtext( "open_socket_in(): setsockopt: " );
908 dbgtext( "SO_REUSEADDR = %s ",
909 val?"true":"false" );
910 dbgtext( "on port %d failed ", port );
911 dbgtext( "with error = %s\n", strerror(errno) );
912 }
913 }
914 #ifdef SO_REUSEPORT
915 if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,
916 (char *)&val,sizeof(val)) == -1 ) {
917 if( DEBUGLVL( dlevel ) ) {
918 dbgtext( "open_socket_in(): setsockopt: ");
919 dbgtext( "SO_REUSEPORT = %s ",
920 val?"true":"false");
921 dbgtext( "on port %d failed ", port);
922 dbgtext( "with error = %s\n", strerror(errno));
923 }
924 }
925 #endif /* SO_REUSEPORT */
926 }
927
928 /* now we've got a socket - we need to bind it */
929 if (bind(res, (struct sockaddr *)&sock, slen) == -1 ) {
930 if( DEBUGLVL(dlevel) && (port == SMB_PORT1 ||
931 port == SMB_PORT2 || port == NMB_PORT) ) {
932 char addr[INET6_ADDRSTRLEN];
933 print_sockaddr(addr, sizeof(addr),
934 &sock);
935 dbgtext( "bind failed on port %d ", port);
936 dbgtext( "socket_addr = %s.\n", addr);
937 dbgtext( "Error = %s\n", strerror(errno));
938 }
939 close(res);
940 return -1;
941 }
942
943 DEBUG( 10, ( "bind succeeded on port %d\n", port ) );
944 return( res );
945 }
946
947 struct open_socket_out_state {
948 int fd;
949 struct event_context *ev;
950 struct sockaddr_storage ss;
951 socklen_t salen;
952 uint16_t port;
953 int wait_nsec;
954 };
955
956 static void open_socket_out_connected(struct tevent_req *subreq);
957
958 static int open_socket_out_state_destructor(struct open_socket_out_state *s)
959 {
960 if (s->fd != -1) {
961 close(s->fd);
962 }
963 return 0;
964 }
965
966 /****************************************************************************
967 Create an outgoing socket. timeout is in milliseconds.
968 **************************************************************************/
969
970 struct tevent_req *open_socket_out_send(TALLOC_CTX *mem_ctx,
971 struct event_context *ev,
972 const struct sockaddr_storage *pss,
973 uint16_t port,
974 int timeout)
975 {
976 char addr[INET6_ADDRSTRLEN];
977 struct tevent_req *result, *subreq;
978 struct open_socket_out_state *state;
979 NTSTATUS status;
980
981 result = tevent_req_create(mem_ctx, &state,
982 struct open_socket_out_state);
983 if (result == NULL) {
984 return NULL;
985 }
986 state->ev = ev;
987 state->ss = *pss;
988 state->port = port;
989 state->wait_nsec = 10000;
990 state->salen = -1;
991
992 state->fd = socket(state->ss.ss_family, SOCK_STREAM, 0);
993 if (state->fd == -1) {
994 status = map_nt_error_from_unix(errno);
995 goto post_status;
996 }
997 talloc_set_destructor(state, open_socket_out_state_destructor);
998
999 if (!tevent_req_set_endtime(
1000 result, ev, timeval_current_ofs(0, timeout*1000))) {
1001 goto fail;
1002 }
1003
1004 #if defined(HAVE_IPV6)
1005 if (pss->ss_family == AF_INET6) {
1006 struct sockaddr_in6 *psa6;
1007 psa6 = (struct sockaddr_in6 *)&state->ss;
1008 psa6->sin6_port = htons(port);
1009 if (psa6->sin6_scope_id == 0
1010 && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
1011 setup_linklocal_scope_id(
1012 (struct sockaddr *)&(state->ss));
1013 }
1014 state->salen = sizeof(struct sockaddr_in6);
1015 }
1016 #endif
1017 if (pss->ss_family == AF_INET) {
1018 struct sockaddr_in *psa;
1019 psa = (struct sockaddr_in *)&state->ss;
1020 psa->sin_port = htons(port);
1021 state->salen = sizeof(struct sockaddr_in);
1022 }
1023
1024 print_sockaddr(addr, sizeof(addr), &state->ss);
1025 DEBUG(3,("Connecting to %s at port %u\n", addr, (unsigned int)port));
1026
1027 subreq = async_connect_send(state, state->ev, state->fd,
1028 (struct sockaddr *)&state->ss,
1029 state->salen);
1030 if ((subreq == NULL)
1031 || !tevent_req_set_endtime(
1032 subreq, state->ev,
1033 timeval_current_ofs(0, state->wait_nsec))) {
1034 goto fail;
1035 }
1036 tevent_req_set_callback(subreq, open_socket_out_connected, result);
1037 return result;
1038
1039 post_status:
1040 tevent_req_nterror(result, status);
1041 return tevent_req_post(result, ev);
1042 fail:
1043 TALLOC_FREE(result);
1044 return NULL;
1045 }
1046
1047 static void open_socket_out_connected(struct tevent_req *subreq)
1048 {
1049 struct tevent_req *req =
1050 tevent_req_callback_data(subreq, struct tevent_req);
1051 struct open_socket_out_state *state =
1052 tevent_req_data(req, struct open_socket_out_state);
1053 int ret;
1054 int sys_errno;
1055
1056 ret = async_connect_recv(subreq, &sys_errno);
1057 TALLOC_FREE(subreq);
1058 if (ret == 0) {
1059 tevent_req_done(req);
1060 return;
1061 }
1062
1063 if (
1064 #ifdef ETIMEDOUT
1065 (sys_errno == ETIMEDOUT) ||
1066 #endif
1067 (sys_errno == EINPROGRESS) ||
1068 (sys_errno == EALREADY) ||
1069 (sys_errno == EAGAIN)) {
1070
1071 /*
1072 * retry
1073 */
1074
1075 if (state->wait_nsec < 250000) {
1076 state->wait_nsec *= 1.5;
1077 }
1078
1079 subreq = async_connect_send(state, state->ev, state->fd,
1080 (struct sockaddr *)&state->ss,
1081 state->salen);
1082 if (tevent_req_nomem(subreq, req)) {
1083 return;
1084 }
1085 if (!tevent_req_set_endtime(
1086 subreq, state->ev,
1087 timeval_current_ofs(0, state->wait_nsec))) {
1088 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1089 return;
1090 }
1091 tevent_req_set_callback(subreq, open_socket_out_connected, req);
1092 return;
1093 }
1094
1095 #ifdef EISCONN
1096 if (sys_errno == EISCONN) {
1097 tevent_req_done(req);
1098 return;
1099 }
1100 #endif
1101
1102 /* real error */
1103 tevent_req_nterror(req, map_nt_error_from_unix(sys_errno));
1104 }
1105
1106 NTSTATUS open_socket_out_recv(struct tevent_req *req, int *pfd)
1107 {
1108 struct open_socket_out_state *state =
1109 tevent_req_data(req, struct open_socket_out_state);
1110 NTSTATUS status;
1111
1112 if (tevent_req_is_nterror(req, &status)) {
1113 return status;
1114 }
1115 *pfd = state->fd;
1116 state->fd = -1;
1117 return NT_STATUS_OK;
1118 }
1119
1120 NTSTATUS open_socket_out(const struct sockaddr_storage *pss, uint16_t port,
1121 int timeout, int *pfd)
1122 {
1123 TALLOC_CTX *frame = talloc_stackframe();
1124 struct event_context *ev;
1125 struct tevent_req *req;
1126 NTSTATUS status = NT_STATUS_NO_MEMORY;
1127
1128 ev = event_context_init(frame);
1129 if (ev == NULL) {
1130 goto fail;
1131 }
1132
1133 req = open_socket_out_send(frame, ev, pss, port, timeout);
1134 if (req == NULL) {
1135 goto fail;
1136 }
1137 if (!tevent_req_poll(req, ev)) {
1138 status = NT_STATUS_INTERNAL_ERROR;
1139 goto fail;
1140 }
1141 status = open_socket_out_recv(req, pfd);
1142 fail:
1143 TALLOC_FREE(frame);
1144 return status;
1145 }
1146
1147 struct open_socket_out_defer_state {
1148 struct event_context *ev;
1149 struct sockaddr_storage ss;
1150 uint16_t port;
1151 int timeout;
1152 int fd;
1153 };
1154
1155 static void open_socket_out_defer_waited(struct tevent_req *subreq);
1156 static void open_socket_out_defer_connected(struct tevent_req *subreq);
1157
1158 struct tevent_req *open_socket_out_defer_send(TALLOC_CTX *mem_ctx,
1159 struct event_context *ev,
1160 struct timeval wait_time,
1161 const struct sockaddr_storage *pss,
1162 uint16_t port,
1163 int timeout)
1164 {
1165 struct tevent_req *req, *subreq;
1166 struct open_socket_out_defer_state *state;
1167
1168 req = tevent_req_create(mem_ctx, &state,
1169 struct open_socket_out_defer_state);
1170 if (req == NULL) {
1171 return NULL;
1172 }
1173 state->ev = ev;
1174 state->ss = *pss;
1175 state->port = port;
1176 state->timeout = timeout;
1177
1178 subreq = tevent_wakeup_send(
1179 state, ev,
1180 timeval_current_ofs(wait_time.tv_sec, wait_time.tv_usec));
1181 if (subreq == NULL) {
1182 goto fail;
1183 }
1184 tevent_req_set_callback(subreq, open_socket_out_defer_waited, req);
1185 return req;
1186 fail:
1187 TALLOC_FREE(req);
1188 return NULL;
1189 }
1190
1191 static void open_socket_out_defer_waited(struct tevent_req *subreq)
1192 {
1193 struct tevent_req *req = tevent_req_callback_data(
1194 subreq, struct tevent_req);
1195 struct open_socket_out_defer_state *state = tevent_req_data(
1196 req, struct open_socket_out_defer_state);
1197 bool ret;
1198
1199 ret = tevent_wakeup_recv(subreq);
1200 TALLOC_FREE(subreq);
1201 if (!ret) {
1202 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
1203 return;
1204 }
1205
1206 subreq = open_socket_out_send(state, state->ev, &state->ss,
1207 state->port, state->timeout);
1208 if (tevent_req_nomem(subreq, req)) {
1209 return;
1210 }
1211 tevent_req_set_callback(subreq, open_socket_out_defer_connected, req);
1212 }
1213
1214 static void open_socket_out_defer_connected(struct tevent_req *subreq)
1215 {
1216 struct tevent_req *req = tevent_req_callback_data(
1217 subreq, struct tevent_req);
1218 struct open_socket_out_defer_state *state = tevent_req_data(
1219 req, struct open_socket_out_defer_state);
1220 NTSTATUS status;
1221
1222 status = open_socket_out_recv(subreq, &state->fd);
1223 TALLOC_FREE(subreq);
1224 if (!NT_STATUS_IS_OK(status)) {
1225 tevent_req_nterror(req, status);
1226 return;
1227 }
1228 tevent_req_done(req);
1229 }
1230
1231 NTSTATUS open_socket_out_defer_recv(struct tevent_req *req, int *pfd)
1232 {
1233 struct open_socket_out_defer_state *state = tevent_req_data(
1234 req, struct open_socket_out_defer_state);
1235 NTSTATUS status;
1236
1237 if (tevent_req_is_nterror(req, &status)) {
1238 return status;
1239 }
1240 *pfd = state->fd;
1241 state->fd = -1;
1242 return NT_STATUS_OK;
1243 }
1244
1245 /*******************************************************************
1246 Create an outgoing TCP socket to the first addr that connects.
1247
1248 This is for simultaneous connection attempts to port 445 and 139 of a host
1249 or for simultatneous connection attempts to multiple DCs at once. We return
1250 a socket fd of the first successful connection.
1251
1252 @param[in] addrs list of Internet addresses and ports to connect to
1253 @param[in] num_addrs number of address/port pairs in the addrs list
1254 @param[in] timeout time after which we stop waiting for a socket connection
1255 to succeed, given in milliseconds
1256 @param[out] fd_index the entry in addrs which we successfully connected to
1257 @param[out] fd fd of the open and connected socket
1258 @return true on a successful connection, false if all connection attempts
1259 failed or we timed out
1260 *******************************************************************/
1261
1262 bool open_any_socket_out(struct sockaddr_storage *addrs, int num_addrs,
1263 int timeout, int *fd_index, int *fd)
1264 {
1265 int i, resulting_index, res;
1266 int *sockets;
1267 bool good_connect;
1268
1269 fd_set r_fds, wr_fds;
1270 struct timeval tv;
1271 int maxfd;
1272
1273 int connect_loop = 10000; /* 10 milliseconds */
1274
1275 timeout *= 1000; /* convert to microseconds */
1276
1277 sockets = SMB_MALLOC_ARRAY(int, num_addrs);
1278
1279 if (sockets == NULL)
1280 return false;
1281
1282 resulting_index = -1;
1283
1284 for (i=0; i<num_addrs; i++)
1285 sockets[i] = -1;
1286
1287 for (i=0; i<num_addrs; i++) {
1288 sockets[i] = socket(addrs[i].ss_family, SOCK_STREAM, 0);
1289 if (sockets[i] < 0)
1290 goto done;
1291 set_blocking(sockets[i], false);
1292 }
1293
1294 connect_again:
1295 good_connect = false;
1296
1297 for (i=0; i<num_addrs; i++) {
1298 const struct sockaddr * a =
1299 (const struct sockaddr *)&(addrs[i]);
1300
1301 if (sockets[i] == -1)
1302 continue;
1303
1304 if (sys_connect(sockets[i], a) == 0) {
1305 /* Rather unlikely as we are non-blocking, but it
1306 * might actually happen. */
1307 resulting_index = i;
1308 goto done;
1309 }
1310
1311 if (errno == EINPROGRESS || errno == EALREADY ||
1312 #ifdef EISCONN
1313 errno == EISCONN ||
1314 #endif
1315 errno == EAGAIN || errno == EINTR) {
1316 /* These are the error messages that something is
1317 progressing. */
1318 good_connect = true;
1319 } else if (errno != 0) {
1320 /* There was a direct error */
1321 close(sockets[i]);
1322 sockets[i] = -1;
1323 }
1324 }
1325
1326 if (!good_connect) {
1327 /* All of the connect's resulted in real error conditions */
1328 goto done;
1329 }
1330
1331 /* Lets see if any of the connect attempts succeeded */
1332
1333 maxfd = 0;
1334 FD_ZERO(&wr_fds);
1335 FD_ZERO(&r_fds);
1336
1337 for (i=0; i<num_addrs; i++) {
1338 if (sockets[i] == -1)
1339 continue;
1340 FD_SET(sockets[i], &wr_fds);
1341 FD_SET(sockets[i], &r_fds);
1342 if (sockets[i]>maxfd)
1343 maxfd = sockets[i];
1344 }
1345
1346 tv.tv_sec = 0;
1347 tv.tv_usec = connect_loop;
1348
1349 res = sys_select_intr(maxfd+1, &r_fds, &wr_fds, NULL, &tv);
1350
1351 if (res < 0)
1352 goto done;
1353
1354 if (res == 0)
1355 goto next_round;
1356
1357 for (i=0; i<num_addrs; i++) {
1358
1359 if (sockets[i] == -1)
1360 continue;
1361
1362 /* Stevens, Network Programming says that if there's a
1363 * successful connect, the socket is only writable. Upon an
1364 * error, it's both readable and writable. */
1365
1366 if (FD_ISSET(sockets[i], &r_fds) &&
1367 FD_ISSET(sockets[i], &wr_fds)) {
1368 /* readable and writable, so it's an error */
1369 close(sockets[i]);
1370 sockets[i] = -1;
1371 continue;
1372 }
1373
1374 if (!FD_ISSET(sockets[i], &r_fds) &&
1375 FD_ISSET(sockets[i], &wr_fds)) {
1376 /* Only writable, so it's connected */
1377 resulting_index = i;
1378 goto done;
1379 }
1380 }
1381
1382 next_round:
1383
1384 timeout -= connect_loop;
1385 if (timeout <= 0)
1386 goto done;
1387 connect_loop *= 1.5;
1388 if (connect_loop > timeout)
1389 connect_loop = timeout;
1390 goto connect_again;
1391
1392 done:
1393 for (i=0; i<num_addrs; i++) {
1394 if (i == resulting_index)
1395 continue;
1396 if (sockets[i] >= 0)
1397 close(sockets[i]);
1398 }
1399
1400 if (resulting_index >= 0) {
1401 *fd_index = resulting_index;
1402 *fd = sockets[*fd_index];
1403 set_blocking(*fd, true);
1404 }
1405
1406 free(sockets);
1407
1408 return (resulting_index >= 0);
1409 }
1410 /****************************************************************************
1411 Open a connected UDP socket to host on port
1412 **************************************************************************/
1413
1414 int open_udp_socket(const char *host, int port)
1415 {
1416 int type = SOCK_DGRAM;
1417 struct sockaddr_in sock_out;
1418 int res;
1419 struct in_addr addr;
1420
1421 addr = interpret_addr2(host);
1422
1423 res = socket(PF_INET, type, 0);
1424 if (res == -1) {
1425 return -1;
1426 }
1427
1428 memset((char *)&sock_out,'\0',sizeof(sock_out));
1429 putip((char *)&sock_out.sin_addr,(char *)&addr);
1430 sock_out.sin_port = htons(port);
1431 sock_out.sin_family = PF_INET;
1432
1433 if (sys_connect(res,(struct sockaddr *)&sock_out)) {
1434 close(res);
1435 return -1;
1436 }
1437
1438 return res;
1439 }
1440
1441 /*******************************************************************
1442 Return the IP addr of the remote end of a socket as a string.
1443 Optionally return the struct sockaddr_storage.
1444 ******************************************************************/
1445
1446 static const char *get_peer_addr_internal(int fd,
1447 char *addr_buf,
1448 size_t addr_buf_len,
1449 struct sockaddr *pss,
1450 socklen_t *plength)
1451 {
1452 struct sockaddr_storage ss;
1453 socklen_t length = sizeof(ss);
1454
1455 strlcpy(addr_buf,"0.0.0.0",addr_buf_len);
1456
1457 if (fd == -1) {
1458 return addr_buf;
1459 }
1460
1461 if (pss == NULL) {
1462 pss = (struct sockaddr *)&ss;
1463 plength = &length;
1464 }
1465
1466 if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) {
1467 DEBUG(0,("getpeername failed. Error was %s\n",
1468 strerror(errno) ));
1469 return addr_buf;
1470 }
1471
1472 print_sockaddr_len(addr_buf,
1473 addr_buf_len,
1474 pss,
1475 *plength);
1476 return addr_buf;
1477 }
1478
1479 /*******************************************************************
1480 Matchname - determine if host name matches IP address. Used to
1481 confirm a hostname lookup to prevent spoof attacks.
1482 ******************************************************************/
1483
1484 static bool matchname(const char *remotehost,
1485 const struct sockaddr *pss,
1486 socklen_t len)
1487 {
1488 struct addrinfo *res = NULL;
1489 struct addrinfo *ailist = NULL;
1490 char addr_buf[INET6_ADDRSTRLEN];
1491 bool ret = interpret_string_addr_internal(&ailist,
1492 remotehost,
1493 AI_ADDRCONFIG|AI_CANONNAME);
1494
1495 if (!ret || ailist == NULL) {
1496 DEBUG(3,("matchname: getaddrinfo failed for "
1497 "name %s [%s]\n",
1498 remotehost,
1499 gai_strerror(ret) ));
1500 return false;
1501 }
1502
1503 /*
1504 * Make sure that getaddrinfo() returns the "correct" host name.
1505 */
1506
1507 if (ailist->ai_canonname == NULL ||
1508 (!strequal(remotehost, ailist->ai_canonname) &&
1509 !strequal(remotehost, "localhost"))) {
1510 DEBUG(0,("matchname: host name/name mismatch: %s != %s\n",
1511 remotehost,
1512 ailist->ai_canonname ?
1513 ailist->ai_canonname : "(NULL)"));
1514 freeaddrinfo(ailist);
1515 return false;
1516 }
1517
1518 /* Look up the host address in the address list we just got. */
1519 for (res = ailist; res; res = res->ai_next) {
1520 if (!res->ai_addr) {
1521 continue;
1522 }
1523 if (sockaddr_equal((const struct sockaddr *)res->ai_addr,
1524 (struct sockaddr *)pss)) {
1525 freeaddrinfo(ailist);
1526 return true;
1527 }
1528 }
1529
1530 /*
1531 * The host name does not map to the original host address. Perhaps
1532 * someone has compromised a name server. More likely someone botched
1533 * it, but that could be dangerous, too.
1534 */
1535
1536 DEBUG(0,("matchname: host name/address mismatch: %s != %s\n",
1537 print_sockaddr_len(addr_buf,
1538 sizeof(addr_buf),
1539 pss,
1540 len),
1541 ailist->ai_canonname ? ailist->ai_canonname : "(NULL)"));
1542
1543 if (ailist) {
1544 freeaddrinfo(ailist);
1545 }
1546 return false;
1547 }
1548
1549 /*******************************************************************
1550 Deal with the singleton cache.
1551 ******************************************************************/
1552
1553 struct name_addr_pair {
1554 struct sockaddr_storage ss;
1555 const char *name;
1556 };
1557
1558 /*******************************************************************
1559 Lookup a name/addr pair. Returns memory allocated from memcache.
1560 ******************************************************************/
1561
1562 static bool lookup_nc(struct name_addr_pair *nc)
1563 {
1564 DATA_BLOB tmp;
1565
1566 ZERO_STRUCTP(nc);
1567
1568 if (!memcache_lookup(
1569 NULL, SINGLETON_CACHE,
1570 data_blob_string_const_null("get_peer_name"),
1571 &tmp)) {
1572 return false;
1573 }
1574
1575 memcpy(&nc->ss, tmp.data, sizeof(nc->ss));
1576 nc->name = (const char *)tmp.data + sizeof(nc->ss);
1577 return true;
1578 }
1579
1580 /*******************************************************************
1581 Save a name/addr pair.
1582 ******************************************************************/
1583
1584 static void store_nc(const struct name_addr_pair *nc)
1585 {
1586 DATA_BLOB tmp;
1587 size_t namelen = strlen(nc->name);
1588
1589 tmp = data_blob(NULL, sizeof(nc->ss) + namelen + 1);
1590 if (!tmp.data) {
1591 return;
1592 }
1593 memcpy(tmp.data, &nc->ss, sizeof(nc->ss));
1594 memcpy(tmp.data+sizeof(nc->ss), nc->name, namelen+1);
1595
1596 memcache_add(NULL, SINGLETON_CACHE,
1597 data_blob_string_const_null("get_peer_name"),
1598 tmp);
1599 data_blob_free(&tmp);
1600 }
1601
1602 /*******************************************************************
1603 Return the DNS name of the remote end of a socket.
1604 ******************************************************************/
1605
1606 const char *get_peer_name(int fd, bool force_lookup)
1607 {
1608 struct name_addr_pair nc;
1609 char addr_buf[INET6_ADDRSTRLEN];
1610 struct sockaddr_storage ss;
1611 socklen_t length = sizeof(ss);
1612 const char *p;
1613 int ret;
1614 char name_buf[MAX_DNS_NAME_LENGTH];
1615 char tmp_name[MAX_DNS_NAME_LENGTH];
1616
1617 /* reverse lookups can be *very* expensive, and in many
1618 situations won't work because many networks don't link dhcp
1619 with dns. To avoid the delay we avoid the lookup if
1620 possible */
1621 if (!lp_hostname_lookups() && (force_lookup == false)) {
1622 length = sizeof(nc.ss);
1623 nc.name = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf),
1624 (struct sockaddr *)&nc.ss, &length);
1625 store_nc(&nc);
1626 lookup_nc(&nc);
1627 return nc.name ? nc.name : "UNKNOWN";
1628 }
1629
1630 lookup_nc(&nc);
1631
1632 memset(&ss, '\0', sizeof(ss));
1633 p = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf), (struct sockaddr *)&ss, &length);
1634
1635 /* it might be the same as the last one - save some DNS work */
1636 if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&nc.ss)) {
1637 return nc.name ? nc.name : "UNKNOWN";
1638 }
1639
1640 /* Not the same. We need to lookup. */
1641 if (fd == -1) {
1642 return "UNKNOWN";
1643 }
1644
1645 /* Look up the remote host name. */
1646 ret = sys_getnameinfo((struct sockaddr *)&ss,
1647 length,
1648 name_buf,
1649 sizeof(name_buf),
1650 NULL,
1651 0,
1652 0);
1653
1654 if (ret) {
1655 DEBUG(1,("get_peer_name: getnameinfo failed "
1656 "for %s with error %s\n",
1657 p,
1658 gai_strerror(ret)));
1659 strlcpy(name_buf, p, sizeof(name_buf));
1660 } else {
1661 if (!matchname(name_buf, (struct sockaddr *)&ss, length)) {
1662 DEBUG(0,("Matchname failed on %s %s\n",name_buf,p));
1663 strlcpy(name_buf,"UNKNOWN",sizeof(name_buf));
1664 }
1665 }
1666
1667 /* can't pass the same source and dest strings in when you
1668 use --enable-developer or the clobber_region() call will
1669 get you */
1670
1671 strlcpy(tmp_name, name_buf, sizeof(tmp_name));
1672 alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
1673 if (strstr(name_buf,"..")) {
1674 strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1675 }
1676
1677 nc.name = name_buf;
1678 nc.ss = ss;
1679
1680 store_nc(&nc);
1681 lookup_nc(&nc);
1682 return nc.name ? nc.name : "UNKNOWN";
1683 }
1684
1685 /*******************************************************************
1686 Return the IP addr of the remote end of a socket as a string.
1687 ******************************************************************/
1688
1689 const char *get_peer_addr(int fd, char *addr, size_t addr_len)
1690 {
1691 return get_peer_addr_internal(fd, addr, addr_len, NULL, NULL);
1692 }
1693
1694 /*******************************************************************
1695 Create protected unix domain socket.
1696
1697 Some unixes cannot set permissions on a ux-dom-sock, so we
1698 have to make sure that the directory contains the protection
1699 permissions instead.
1700 ******************************************************************/
1701
1702 int create_pipe_sock(const char *socket_dir,
1703 const char *socket_name,
1704 mode_t dir_perms)
1705 {
1706 #ifdef HAVE_UNIXSOCKET
1707 struct sockaddr_un sunaddr;
1708 struct stat st;
1709 int sock;
1710 mode_t old_umask;
1711 char *path = NULL;
1712
1713 old_umask = umask(0);
1714
1715 /* Create the socket directory or reuse the existing one */
1716
1717 if (lstat(socket_dir, &st) == -1) {
1718 if (errno == ENOENT) {
1719 /* Create directory */
1720 if (mkdir(socket_dir, dir_perms) == -1) {
1721 DEBUG(0, ("error creating socket directory "
1722 "%s: %s\n", socket_dir,
1723 strerror(errno)));
1724 goto out_umask;
1725 }
1726 } else {
1727 DEBUG(0, ("lstat failed on socket directory %s: %s\n",
1728 socket_dir, strerror(errno)));
1729 goto out_umask;
1730 }
1731 } else {
1732 /* Check ownership and permission on existing directory */
1733 if (!S_ISDIR(st.st_mode)) {
1734 DEBUG(0, ("socket directory %s isn't a directory\n",
1735 socket_dir));
1736 goto out_umask;
1737 }
1738 if ((st.st_uid != sec_initial_uid()) ||
1739 ((st.st_mode & 0777) != dir_perms)) {
1740 DEBUG(0, ("invalid permissions on socket directory "
1741 "%s\n", socket_dir));
1742 goto out_umask;
1743 }
1744 }
1745
1746 /* Create the socket file */
1747
1748 sock = socket(AF_UNIX, SOCK_STREAM, 0);
1749
1750 if (sock == -1) {
1751 DEBUG(0, ("create_pipe_sock: socket error %s\n",
1752 strerror(errno) ));
1753 goto out_close;
1754 }
1755
1756 if (asprintf(&path, "%s/%s", socket_dir, socket_name) == -1) {
1757 goto out_close;
1758 }
1759
1760 unlink(path);
1761 memset(&sunaddr, 0, sizeof(sunaddr));
1762 sunaddr.sun_family = AF_UNIX;
1763 strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path));
1764
1765 if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1766 DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
1767 strerror(errno)));
1768 goto out_close;
1769 }
1770
1771 if (listen(sock, 5) == -1) {
1772 DEBUG(0, ("listen failed on pipe socket %s: %s\n", path,
1773 strerror(errno)));
1774 goto out_close;
1775 }
1776
1777 SAFE_FREE(path);
1778
1779 umask(old_umask);
1780 return sock;
1781
1782 out_close:
1783 SAFE_FREE(path);
1784 if (sock != -1)
1785 close(sock);
1786
1787 out_umask:
1788 umask(old_umask);
1789 return -1;
1790
1791 #else
1792 DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
1793 return -1;
1794 #endif /* HAVE_UNIXSOCKET */
1795 }
1796
1797 /****************************************************************************
1798 Get my own canonical name, including domain.
1799 ****************************************************************************/
1800
1801 const char *get_mydnsfullname(void)
1802 {
1803 struct addrinfo *res = NULL;
1804 char my_hostname[HOST_NAME_MAX];
1805 bool ret;
1806 DATA_BLOB tmp;
1807
1808 if (memcache_lookup(NULL, SINGLETON_CACHE,
1809 data_blob_string_const_null("get_mydnsfullname"),
1810 &tmp)) {
1811 SMB_ASSERT(tmp.length > 0);
1812 return (const char *)tmp.data;
1813 }
1814
1815 /* get my host name */
1816 if (gethostname(my_hostname, sizeof(my_hostname)) == -1) {
1817 DEBUG(0,("get_mydnsfullname: gethostname failed\n"));
1818 return NULL;
1819 }
1820
1821 /* Ensure null termination. */
1822 my_hostname[sizeof(my_hostname)-1] = '\0';
1823
1824 ret = interpret_string_addr_internal(&res,
1825 my_hostname,
1826 AI_ADDRCONFIG|AI_CANONNAME);
1827
1828 if (!ret || res == NULL) {
1829 DEBUG(3,("get_mydnsfullname: getaddrinfo failed for "
1830 "name %s [%s]\n",
1831 my_hostname,
1832 gai_strerror(ret) ));
1833 return NULL;
1834 }
1835
1836 /*
1837 * Make sure that getaddrinfo() returns the "correct" host name.
1838 */
1839
1840 if (res->ai_canonname == NULL) {
1841 DEBUG(3,("get_mydnsfullname: failed to get "
1842 "canonical name for %s\n",
1843 my_hostname));
1844 freeaddrinfo(res);
1845 return NULL;
1846 }
1847
1848 /* This copies the data, so we must do a lookup
1849 * afterwards to find the value to return.
1850 */
1851
1852 memcache_add(NULL, SINGLETON_CACHE,
1853 data_blob_string_const_null("get_mydnsfullname"),
1854 data_blob_string_const_null(res->ai_canonname));
1855
1856 if (!memcache_lookup(NULL, SINGLETON_CACHE,
1857 data_blob_string_const_null("get_mydnsfullname"),
1858 &tmp)) {
1859 tmp = data_blob_talloc(talloc_tos(), res->ai_canonname,
1860 strlen(res->ai_canonname) + 1);
1861 }
1862
1863 freeaddrinfo(res);
1864
1865 return (const char *)tmp.data;
1866 }
1867
1868 /************************************************************
1869 Is this my name ?
1870 ************************************************************/
1871
1872 bool is_myname_or_ipaddr(const char *s)
1873 {
1874 TALLOC_CTX *ctx = talloc_tos();
1875 char addr[INET6_ADDRSTRLEN];
1876 char *name = NULL;
1877 const char *dnsname;
1878 char *servername = NULL;
1879
1880 if (!s) {
1881 return false;
1882 }
1883
1884 /* Santize the string from '\\name' */
1885 name = talloc_strdup(ctx, s);
1886 if (!name) {
1887 return false;
1888 }
1889
1890 servername = strrchr_m(name, '\\' );
1891 if (!servername) {
1892 servername = name;
1893 } else {
1894 servername++;
1895 }
1896
1897 /* Optimize for the common case */
1898 if (strequal(servername, global_myname())) {
1899 return true;
1900 }
1901
1902 /* Check for an alias */
1903 if (is_myname(servername)) {
1904 return true;
1905 }
1906
1907 /* Check for loopback */
1908 if (strequal(servername, "127.0.0.1") ||
1909 strequal(servername, "::1")) {
1910 return true;
1911 }
1912
1913 if (strequal(servername, "localhost")) {
1914 return true;
1915 }
1916
1917 /* Maybe it's my dns name */
1918 dnsname = get_mydnsfullname();
1919 if (dnsname && strequal(servername, dnsname)) {
1920 return true;
1921 }
1922
1923 /* Handle possible CNAME records - convert to an IP addr. */
1924 if (!is_ipaddress(servername)) {
1925 /* Use DNS to resolve the name, but only the first address */
1926 struct sockaddr_storage ss;
1927 if (interpret_string_addr(&ss, servername, 0)) {
1928 print_sockaddr(addr,
1929 sizeof(addr),
1930 &ss);
1931 servername = addr;
1932 }
1933 }
1934
1935 /* Maybe its an IP address? */
1936 if (is_ipaddress(servername)) {
1937 struct sockaddr_storage ss;
1938 struct iface_struct *nics;
1939 int i, n;
1940
1941 if (!interpret_string_addr(&ss, servername, AI_NUMERICHOST)) {
1942 return false;
1943 }
1944
1945 if (is_zero_addr((struct sockaddr *)&ss) ||
1946 is_loopback_addr((struct sockaddr *)&ss)) {
1947 return false;
1948 }
1949
1950 nics = TALLOC_ARRAY(ctx, struct iface_struct,
1951 MAX_INTERFACES);
1952 if (!nics) {
1953 return false;
1954 }
1955 n = get_interfaces(nics, MAX_INTERFACES);
1956 for (i=0; i<n; i++) {
1957 if (sockaddr_equal((struct sockaddr *)&nics[i].ip, (struct sockaddr *)&ss)) {
1958 TALLOC_FREE(nics);
1959 return true;
1960 }
1961 }
1962 TALLOC_FREE(nics);
1963 }
1964
1965 /* No match */
1966 return false;
1967 }
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