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s3/docs: Fix typo.
[Samba/gebeck_regimport.git] / source3 / lib / util_sock.c
blob3fd0cc4ad31c83a0fe94ffecc9e2bbe94302b6fc
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 /****************************************************************************
212 Return the port number we've bound to on a socket.
213 ****************************************************************************/
214
215 int get_socket_port(int fd)
216 {
217 struct sockaddr_storage sa;
218 socklen_t length = sizeof(sa);
219
220 if (fd == -1) {
221 return -1;
222 }
223
224 if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) {
225 DEBUG(0,("getpeername failed. Error was %s\n",
226 strerror(errno) ));
227 return -1;
228 }
229
230 #if defined(HAVE_IPV6)
231 if (sa.ss_family == AF_INET6) {
232 return ntohs(((struct sockaddr_in6 *)&sa)->sin6_port);
233 }
234 #endif
235 if (sa.ss_family == AF_INET) {
236 return ntohs(((struct sockaddr_in *)&sa)->sin_port);
237 }
238 return -1;
239 }
240
241 const char *client_name(int fd)
242 {
243 return get_peer_name(fd,false);
244 }
245
246 const char *client_addr(int fd, char *addr, size_t addrlen)
247 {
248 return get_peer_addr(fd,addr,addrlen);
249 }
250
251 const char *client_socket_addr(int fd, char *addr, size_t addr_len)
252 {
253 return get_socket_addr(fd, addr, addr_len);
254 }
255
256 #if 0
257 /* Not currently used. JRA. */
258 int client_socket_port(int fd)
259 {
260 return get_socket_port(fd);
261 }
262 #endif
263
264 /****************************************************************************
265 Accessor functions to make thread-safe code easier later...
266 ****************************************************************************/
267
268 void set_smb_read_error(enum smb_read_errors *pre,
269 enum smb_read_errors newerr)
270 {
271 if (pre) {
272 *pre = newerr;
273 }
274 }
275
276 void cond_set_smb_read_error(enum smb_read_errors *pre,
277 enum smb_read_errors newerr)
278 {
279 if (pre && *pre == SMB_READ_OK) {
280 *pre = newerr;
281 }
282 }
283
284 /****************************************************************************
285 Determine if a file descriptor is in fact a socket.
286 ****************************************************************************/
287
288 bool is_a_socket(int fd)
289 {
290 int v;
291 socklen_t l;
292 l = sizeof(int);
293 return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
294 }
295
296 enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON};
297
298 typedef struct smb_socket_option {
299 const char *name;
300 int level;
301 int option;
302 int value;
303 int opttype;
304 } smb_socket_option;
305
306 static const smb_socket_option socket_options[] = {
307 {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL},
308 {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL},
309 {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL},
310 #ifdef TCP_NODELAY
311 {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL},
312 #endif
313 #ifdef TCP_KEEPCNT
314 {"TCP_KEEPCNT", IPPROTO_TCP, TCP_KEEPCNT, 0, OPT_INT},
315 #endif
316 #ifdef TCP_KEEPIDLE
317 {"TCP_KEEPIDLE", IPPROTO_TCP, TCP_KEEPIDLE, 0, OPT_INT},
318 #endif
319 #ifdef TCP_KEEPINTVL
320 {"TCP_KEEPINTVL", IPPROTO_TCP, TCP_KEEPINTVL, 0, OPT_INT},
321 #endif
322 #ifdef IPTOS_LOWDELAY
323 {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON},
324 #endif
325 #ifdef IPTOS_THROUGHPUT
326 {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON},
327 #endif
328 #ifdef SO_REUSEPORT
329 {"SO_REUSEPORT", SOL_SOCKET, SO_REUSEPORT, 0, OPT_BOOL},
330 #endif
331 #ifdef SO_SNDBUF
332 {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT},
333 #endif
334 #ifdef SO_RCVBUF
335 {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT},
336 #endif
337 #ifdef SO_SNDLOWAT
338 {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT},
339 #endif
340 #ifdef SO_RCVLOWAT
341 {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT},
342 #endif
343 #ifdef SO_SNDTIMEO
344 {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT},
345 #endif
346 #ifdef SO_RCVTIMEO
347 {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT},
348 #endif
349 #ifdef TCP_FASTACK
350 {"TCP_FASTACK", IPPROTO_TCP, TCP_FASTACK, 0, OPT_INT},
351 #endif
352 {NULL,0,0,0,0}};
353
354 /****************************************************************************
355 Print socket options.
356 ****************************************************************************/
357
358 static void print_socket_options(int s)
359 {
360 int value;
361 socklen_t vlen = 4;
362 const smb_socket_option *p = &socket_options[0];
363
364 /* wrapped in if statement to prevent streams
365 * leak in SCO Openserver 5.0 */
366 /* reported on samba-technical --jerry */
367 if ( DEBUGLEVEL >= 5 ) {
368 DEBUG(5,("Socket options:\n"));
369 for (; p->name != NULL; p++) {
370 if (getsockopt(s, p->level, p->option,
371 (void *)&value, &vlen) == -1) {
372 DEBUGADD(5,("\tCould not test socket option %s.\n",
373 p->name));
374 } else {
375 DEBUGADD(5,("\t%s = %d\n",
376 p->name,value));
377 }
378 }
379 }
380 }
381
382 /****************************************************************************
383 Set user socket options.
384 ****************************************************************************/
385
386 void set_socket_options(int fd, const char *options)
387 {
388 TALLOC_CTX *ctx = talloc_stackframe();
389 char *tok;
390
391 while (next_token_talloc(ctx, &options, &tok," \t,")) {
392 int ret=0,i;
393 int value = 1;
394 char *p;
395 bool got_value = false;
396
397 if ((p = strchr_m(tok,'='))) {
398 *p = 0;
399 value = atoi(p+1);
400 got_value = true;
401 }
402
403 for (i=0;socket_options[i].name;i++)
404 if (strequal(socket_options[i].name,tok))
405 break;
406
407 if (!socket_options[i].name) {
408 DEBUG(0,("Unknown socket option %s\n",tok));
409 continue;
410 }
411
412 switch (socket_options[i].opttype) {
413 case OPT_BOOL:
414 case OPT_INT:
415 ret = setsockopt(fd,socket_options[i].level,
416 socket_options[i].option,
417 (char *)&value,sizeof(int));
418 break;
419
420 case OPT_ON:
421 if (got_value)
422 DEBUG(0,("syntax error - %s "
423 "does not take a value\n",tok));
424
425 {
426 int on = socket_options[i].value;
427 ret = setsockopt(fd,socket_options[i].level,
428 socket_options[i].option,
429 (char *)&on,sizeof(int));
430 }
431 break;
432 }
433
434 if (ret != 0) {
435 /* be aware that some systems like Solaris return
436 * EINVAL to a setsockopt() call when the client
437 * sent a RST previously - no need to worry */
438 DEBUG(2,("Failed to set socket option %s (Error %s)\n",
439 tok, strerror(errno) ));
440 }
441 }
442
443 TALLOC_FREE(ctx);
444 print_socket_options(fd);
445 }
446
447 /****************************************************************************
448 Read from a socket.
449 ****************************************************************************/
450
451 ssize_t read_udp_v4_socket(int fd,
452 char *buf,
453 size_t len,
454 struct sockaddr_storage *psa)
455 {
456 ssize_t ret;
457 socklen_t socklen = sizeof(*psa);
458 struct sockaddr_in *si = (struct sockaddr_in *)psa;
459
460 memset((char *)psa,'\0',socklen);
461
462 ret = (ssize_t)sys_recvfrom(fd,buf,len,0,
463 (struct sockaddr *)psa,&socklen);
464 if (ret <= 0) {
465 /* Don't print a low debug error for a non-blocking socket. */
466 if (errno == EAGAIN) {
467 DEBUG(10,("read_udp_v4_socket: returned EAGAIN\n"));
468 } else {
469 DEBUG(2,("read_udp_v4_socket: failed. errno=%s\n",
470 strerror(errno)));
471 }
472 return 0;
473 }
474
475 if (psa->ss_family != AF_INET) {
476 DEBUG(2,("read_udp_v4_socket: invalid address family %d "
477 "(not IPv4)\n", (int)psa->ss_family));
478 return 0;
479 }
480
481 DEBUG(10,("read_udp_v4_socket: ip %s port %d read: %lu\n",
482 inet_ntoa(si->sin_addr),
483 si->sin_port,
484 (unsigned long)ret));
485
486 return ret;
487 }
488
489 /****************************************************************************
490 Read data from a socket with a timout in msec.
491 mincount = if timeout, minimum to read before returning
492 maxcount = number to be read.
493 time_out = timeout in milliseconds
494 ****************************************************************************/
495
496 NTSTATUS read_socket_with_timeout(int fd, char *buf,
497 size_t mincnt, size_t maxcnt,
498 unsigned int time_out,
499 size_t *size_ret)
500 {
501 fd_set fds;
502 int selrtn;
503 ssize_t readret;
504 size_t nread = 0;
505 struct timeval timeout;
506 char addr[INET6_ADDRSTRLEN];
507
508 /* just checking .... */
509 if (maxcnt <= 0)
510 return NT_STATUS_OK;
511
512 /* Blocking read */
513 if (time_out == 0) {
514 if (mincnt == 0) {
515 mincnt = maxcnt;
516 }
517
518 while (nread < mincnt) {
519 readret = sys_recv(fd, buf + nread, maxcnt - nread, 0);
520
521 if (readret == 0) {
522 DEBUG(5,("read_socket_with_timeout: "
523 "blocking read. EOF from client.\n"));
524 return NT_STATUS_END_OF_FILE;
525 }
526
527 if (readret == -1) {
528 if (fd == get_client_fd()) {
529 /* Try and give an error message
530 * saying what client failed. */
531 DEBUG(0,("read_socket_with_timeout: "
532 "client %s read error = %s.\n",
533 get_peer_addr(fd,addr,sizeof(addr)),
534 strerror(errno) ));
535 } else {
536 DEBUG(0,("read_socket_with_timeout: "
537 "read error = %s.\n",
538 strerror(errno) ));
539 }
540 return map_nt_error_from_unix(errno);
541 }
542 nread += readret;
543 }
544 goto done;
545 }
546
547 /* Most difficult - timeout read */
548 /* If this is ever called on a disk file and
549 mincnt is greater then the filesize then
550 system performance will suffer severely as
551 select always returns true on disk files */
552
553 /* Set initial timeout */
554 timeout.tv_sec = (time_t)(time_out / 1000);
555 timeout.tv_usec = (long)(1000 * (time_out % 1000));
556
557 for (nread=0; nread < mincnt; ) {
558 FD_ZERO(&fds);
559 FD_SET(fd,&fds);
560
561 selrtn = sys_select_intr(fd+1,&fds,NULL,NULL,&timeout);
562
563 /* Check if error */
564 if (selrtn == -1) {
565 /* something is wrong. Maybe the socket is dead? */
566 if (fd == get_client_fd()) {
567 /* Try and give an error message saying
568 * what client failed. */
569 DEBUG(0,("read_socket_with_timeout: timeout "
570 "read for client %s. select error = %s.\n",
571 get_peer_addr(fd,addr,sizeof(addr)),
572 strerror(errno) ));
573 } else {
574 DEBUG(0,("read_socket_with_timeout: timeout "
575 "read. select error = %s.\n",
576 strerror(errno) ));
577 }
578 return map_nt_error_from_unix(errno);
579 }
580
581 /* Did we timeout ? */
582 if (selrtn == 0) {
583 DEBUG(10,("read_socket_with_timeout: timeout read. "
584 "select timed out.\n"));
585 return NT_STATUS_IO_TIMEOUT;
586 }
587
588 readret = sys_recv(fd, buf+nread, maxcnt-nread, 0);
589
590 if (readret == 0) {
591 /* we got EOF on the file descriptor */
592 DEBUG(5,("read_socket_with_timeout: timeout read. "
593 "EOF from client.\n"));
594 return NT_STATUS_END_OF_FILE;
595 }
596
597 if (readret == -1) {
598 /* the descriptor is probably dead */
599 if (fd == get_client_fd()) {
600 /* Try and give an error message
601 * saying what client failed. */
602 DEBUG(0,("read_socket_with_timeout: timeout "
603 "read to client %s. read error = %s.\n",
604 get_peer_addr(fd,addr,sizeof(addr)),
605 strerror(errno) ));
606 } else {
607 DEBUG(0,("read_socket_with_timeout: timeout "
608 "read. read error = %s.\n",
609 strerror(errno) ));
610 }
611 return map_nt_error_from_unix(errno);
612 }
613
614 nread += readret;
615 }
616
617 done:
618 /* Return the number we got */
619 if (size_ret) {
620 *size_ret = nread;
621 }
622 return NT_STATUS_OK;
623 }
624
625 /****************************************************************************
626 Read data from the client, reading exactly N bytes.
627 ****************************************************************************/
628
629 NTSTATUS read_data(int fd, char *buffer, size_t N)
630 {
631 return read_socket_with_timeout(fd, buffer, N, N, 0, NULL);
632 }
633
634 /****************************************************************************
635 Write all data from an iov array
636 ****************************************************************************/
637
638 ssize_t write_data_iov(int fd, const struct iovec *orig_iov, int iovcnt)
639 {
640 int i;
641 size_t to_send;
642 ssize_t thistime;
643 size_t sent;
644 struct iovec *iov_copy, *iov;
645
646 to_send = 0;
647 for (i=0; i<iovcnt; i++) {
648 to_send += orig_iov[i].iov_len;
649 }
650
651 thistime = sys_writev(fd, orig_iov, iovcnt);
652 if ((thistime <= 0) || (thistime == to_send)) {
653 return thistime;
654 }
655 sent = thistime;
656
657 /*
658 * We could not send everything in one call. Make a copy of iov that
659 * we can mess with. We keep a copy of the array start in iov_copy for
660 * the TALLOC_FREE, because we're going to modify iov later on,
661 * discarding elements.
662 */
663
664 iov_copy = (struct iovec *)TALLOC_MEMDUP(
665 talloc_tos(), orig_iov, sizeof(struct iovec) * iovcnt);
666
667 if (iov_copy == NULL) {
668 errno = ENOMEM;
669 return -1;
670 }
671 iov = iov_copy;
672
673 while (sent < to_send) {
674 /*
675 * We have to discard "thistime" bytes from the beginning
676 * iov array, "thistime" contains the number of bytes sent
677 * via writev last.
678 */
679 while (thistime > 0) {
680 if (thistime < iov[0].iov_len) {
681 char *new_base =
682 (char *)iov[0].iov_base + thistime;
683 iov[0].iov_base = new_base;
684 iov[0].iov_len -= thistime;
685 break;
686 }
687 thistime -= iov[0].iov_len;
688 iov += 1;
689 iovcnt -= 1;
690 }
691
692 thistime = sys_writev(fd, iov, iovcnt);
693 if (thistime <= 0) {
694 break;
695 }
696 sent += thistime;
697 }
698
699 TALLOC_FREE(iov_copy);
700 return sent;
701 }
702
703 /****************************************************************************
704 Write data to a fd.
705 ****************************************************************************/
706
707 ssize_t write_data(int fd, const char *buffer, size_t N)
708 {
709 ssize_t ret;
710 struct iovec iov;
711
712 iov.iov_base = CONST_DISCARD(char *, buffer);
713 iov.iov_len = N;
714
715 ret = write_data_iov(fd, &iov, 1);
716 if (ret >= 0) {
717 return ret;
718 }
719
720 if (fd == get_client_fd()) {
721 char addr[INET6_ADDRSTRLEN];
722 /*
723 * Try and give an error message saying what client failed.
724 */
725 DEBUG(0, ("write_data: write failure in writing to client %s. "
726 "Error %s\n", get_peer_addr(fd,addr,sizeof(addr)),
727 strerror(errno)));
728 } else {
729 DEBUG(0,("write_data: write failure. Error = %s\n",
730 strerror(errno) ));
731 }
732
733 return -1;
734 }
735
736 /****************************************************************************
737 Send a keepalive packet (rfc1002).
738 ****************************************************************************/
739
740 bool send_keepalive(int client)
741 {
742 unsigned char buf[4];
743
744 buf[0] = SMBkeepalive;
745 buf[1] = buf[2] = buf[3] = 0;
746
747 return(write_data(client,(char *)buf,4) == 4);
748 }
749
750 /****************************************************************************
751 Read 4 bytes of a smb packet and return the smb length of the packet.
752 Store the result in the buffer.
753 This version of the function will return a length of zero on receiving
754 a keepalive packet.
755 Timeout is in milliseconds.
756 ****************************************************************************/
757
758 NTSTATUS read_smb_length_return_keepalive(int fd, char *inbuf,
759 unsigned int timeout,
760 size_t *len)
761 {
762 int msg_type;
763 NTSTATUS status;
764
765 status = read_socket_with_timeout(fd, inbuf, 4, 4, timeout, NULL);
766
767 if (!NT_STATUS_IS_OK(status)) {
768 return status;
769 }
770
771 *len = smb_len(inbuf);
772 msg_type = CVAL(inbuf,0);
773
774 if (msg_type == SMBkeepalive) {
775 DEBUG(5,("Got keepalive packet\n"));
776 }
777
778 DEBUG(10,("got smb length of %lu\n",(unsigned long)(*len)));
779
780 return NT_STATUS_OK;
781 }
782
783 /****************************************************************************
784 Read 4 bytes of a smb packet and return the smb length of the packet.
785 Store the result in the buffer. This version of the function will
786 never return a session keepalive (length of zero).
787 Timeout is in milliseconds.
788 ****************************************************************************/
789
790 NTSTATUS read_smb_length(int fd, char *inbuf, unsigned int timeout,
791 size_t *len)
792 {
793 uint8_t msgtype = SMBkeepalive;
794
795 while (msgtype == SMBkeepalive) {
796 NTSTATUS status;
797
798 status = read_smb_length_return_keepalive(fd, inbuf, timeout,
799 len);
800 if (!NT_STATUS_IS_OK(status)) {
801 return status;
802 }
803
804 msgtype = CVAL(inbuf, 0);
805 }
806
807 DEBUG(10,("read_smb_length: got smb length of %lu\n",
808 (unsigned long)len));
809
810 return NT_STATUS_OK;
811 }
812
813 /****************************************************************************
814 Read an smb from a fd.
815 The timeout is in milliseconds.
816 This function will return on receipt of a session keepalive packet.
817 maxlen is the max number of bytes to return, not including the 4 byte
818 length. If zero it means buflen limit.
819 Doesn't check the MAC on signed packets.
820 ****************************************************************************/
821
822 NTSTATUS receive_smb_raw(int fd, char *buffer, size_t buflen, unsigned int timeout,
823 size_t maxlen, size_t *p_len)
824 {
825 size_t len;
826 NTSTATUS status;
827
828 status = read_smb_length_return_keepalive(fd,buffer,timeout,&len);
829
830 if (!NT_STATUS_IS_OK(status)) {
831 DEBUG(10, ("receive_smb_raw: %s!\n", nt_errstr(status)));
832 return status;
833 }
834
835 if (len > buflen) {
836 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
837 (unsigned long)len));
838 return NT_STATUS_INVALID_PARAMETER;
839 }
840
841 if(len > 0) {
842 if (maxlen) {
843 len = MIN(len,maxlen);
844 }
845
846 status = read_socket_with_timeout(
847 fd, buffer+4, len, len, timeout, &len);
848
849 if (!NT_STATUS_IS_OK(status)) {
850 return status;
851 }
852
853 /* not all of samba3 properly checks for packet-termination
854 * of strings. This ensures that we don't run off into
855 * empty space. */
856 SSVAL(buffer+4,len, 0);
857 }
858
859 *p_len = len;
860 return NT_STATUS_OK;
861 }
862
863 /****************************************************************************
864 Open a socket of the specified type, port, and address for incoming data.
865 ****************************************************************************/
866
867 int open_socket_in(int type,
868 uint16_t port,
869 int dlevel,
870 const struct sockaddr_storage *psock,
871 bool rebind)
872 {
873 struct sockaddr_storage sock;
874 int res;
875 socklen_t slen = sizeof(struct sockaddr_in);
876
877 sock = *psock;
878
879 #if defined(HAVE_IPV6)
880 if (sock.ss_family == AF_INET6) {
881 ((struct sockaddr_in6 *)&sock)->sin6_port = htons(port);
882 slen = sizeof(struct sockaddr_in6);
883 }
884 #endif
885 if (sock.ss_family == AF_INET) {
886 ((struct sockaddr_in *)&sock)->sin_port = htons(port);
887 }
888
889 res = socket(sock.ss_family, type, 0 );
890 if( res == -1 ) {
891 if( DEBUGLVL(0) ) {
892 dbgtext( "open_socket_in(): socket() call failed: " );
893 dbgtext( "%s\n", strerror( errno ) );
894 }
895 return -1;
896 }
897
898 /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
899 {
900 int val = rebind ? 1 : 0;
901 if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,
902 (char *)&val,sizeof(val)) == -1 ) {
903 if( DEBUGLVL( dlevel ) ) {
904 dbgtext( "open_socket_in(): setsockopt: " );
905 dbgtext( "SO_REUSEADDR = %s ",
906 val?"true":"false" );
907 dbgtext( "on port %d failed ", port );
908 dbgtext( "with error = %s\n", strerror(errno) );
909 }
910 }
911 #ifdef SO_REUSEPORT
912 if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,
913 (char *)&val,sizeof(val)) == -1 ) {
914 if( DEBUGLVL( dlevel ) ) {
915 dbgtext( "open_socket_in(): setsockopt: ");
916 dbgtext( "SO_REUSEPORT = %s ",
917 val?"true":"false");
918 dbgtext( "on port %d failed ", port);
919 dbgtext( "with error = %s\n", strerror(errno));
920 }
921 }
922 #endif /* SO_REUSEPORT */
923 }
924
925 /* now we've got a socket - we need to bind it */
926 if (bind(res, (struct sockaddr *)&sock, slen) == -1 ) {
927 if( DEBUGLVL(dlevel) && (port == SMB_PORT1 ||
928 port == SMB_PORT2 || port == NMB_PORT) ) {
929 char addr[INET6_ADDRSTRLEN];
930 print_sockaddr(addr, sizeof(addr),
931 &sock);
932 dbgtext( "bind failed on port %d ", port);
933 dbgtext( "socket_addr = %s.\n", addr);
934 dbgtext( "Error = %s\n", strerror(errno));
935 }
936 close(res);
937 return -1;
938 }
939
940 DEBUG( 10, ( "bind succeeded on port %d\n", port ) );
941 return( res );
942 }
943
944 struct open_socket_out_state {
945 int fd;
946 struct event_context *ev;
947 struct sockaddr_storage ss;
948 socklen_t salen;
949 uint16_t port;
950 int wait_nsec;
951 };
952
953 static void open_socket_out_connected(struct tevent_req *subreq);
954
955 static int open_socket_out_state_destructor(struct open_socket_out_state *s)
956 {
957 if (s->fd != -1) {
958 close(s->fd);
959 }
960 return 0;
961 }
962
963 /****************************************************************************
964 Create an outgoing socket. timeout is in milliseconds.
965 **************************************************************************/
966
967 struct tevent_req *open_socket_out_send(TALLOC_CTX *mem_ctx,
968 struct event_context *ev,
969 const struct sockaddr_storage *pss,
970 uint16_t port,
971 int timeout)
972 {
973 char addr[INET6_ADDRSTRLEN];
974 struct tevent_req *result, *subreq;
975 struct open_socket_out_state *state;
976 NTSTATUS status;
977
978 result = tevent_req_create(mem_ctx, &state,
979 struct open_socket_out_state);
980 if (result == NULL) {
981 return NULL;
982 }
983 state->ev = ev;
984 state->ss = *pss;
985 state->port = port;
986 state->wait_nsec = 10000;
987 state->salen = -1;
988
989 state->fd = socket(state->ss.ss_family, SOCK_STREAM, 0);
990 if (state->fd == -1) {
991 status = map_nt_error_from_unix(errno);
992 goto post_status;
993 }
994 talloc_set_destructor(state, open_socket_out_state_destructor);
995
996 if (!tevent_req_set_endtime(
997 result, ev, timeval_current_ofs(0, timeout*1000))) {
998 goto fail;
999 }
1000
1001 #if defined(HAVE_IPV6)
1002 if (pss->ss_family == AF_INET6) {
1003 struct sockaddr_in6 *psa6;
1004 psa6 = (struct sockaddr_in6 *)&state->ss;
1005 psa6->sin6_port = htons(port);
1006 if (psa6->sin6_scope_id == 0
1007 && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
1008 setup_linklocal_scope_id(
1009 (struct sockaddr *)&(state->ss));
1010 }
1011 state->salen = sizeof(struct sockaddr_in6);
1012 }
1013 #endif
1014 if (pss->ss_family == AF_INET) {
1015 struct sockaddr_in *psa;
1016 psa = (struct sockaddr_in *)&state->ss;
1017 psa->sin_port = htons(port);
1018 state->salen = sizeof(struct sockaddr_in);
1019 }
1020
1021 print_sockaddr(addr, sizeof(addr), &state->ss);
1022 DEBUG(3,("Connecting to %s at port %u\n", addr, (unsigned int)port));
1023
1024 subreq = async_connect_send(state, state->ev, state->fd,
1025 (struct sockaddr *)&state->ss,
1026 state->salen);
1027 if ((subreq == NULL)
1028 || !tevent_req_set_endtime(
1029 subreq, state->ev,
1030 timeval_current_ofs(0, state->wait_nsec))) {
1031 goto fail;
1032 }
1033 tevent_req_set_callback(subreq, open_socket_out_connected, result);
1034 return result;
1035
1036 post_status:
1037 tevent_req_nterror(result, status);
1038 return tevent_req_post(result, ev);
1039 fail:
1040 TALLOC_FREE(result);
1041 return NULL;
1042 }
1043
1044 static void open_socket_out_connected(struct tevent_req *subreq)
1045 {
1046 struct tevent_req *req =
1047 tevent_req_callback_data(subreq, struct tevent_req);
1048 struct open_socket_out_state *state =
1049 tevent_req_data(req, struct open_socket_out_state);
1050 int ret;
1051 int sys_errno;
1052
1053 ret = async_connect_recv(subreq, &sys_errno);
1054 TALLOC_FREE(subreq);
1055 if (ret == 0) {
1056 tevent_req_done(req);
1057 return;
1058 }
1059
1060 if (
1061 #ifdef ETIMEDOUT
1062 (sys_errno == ETIMEDOUT) ||
1063 #endif
1064 (sys_errno == EINPROGRESS) ||
1065 (sys_errno == EALREADY) ||
1066 (sys_errno == EAGAIN)) {
1067
1068 /*
1069 * retry
1070 */
1071
1072 if (state->wait_nsec < 250000) {
1073 state->wait_nsec *= 1.5;
1074 }
1075
1076 subreq = async_connect_send(state, state->ev, state->fd,
1077 (struct sockaddr *)&state->ss,
1078 state->salen);
1079 if (tevent_req_nomem(subreq, req)) {
1080 return;
1081 }
1082 if (!tevent_req_set_endtime(
1083 subreq, state->ev,
1084 timeval_current_ofs(0, state->wait_nsec))) {
1085 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1086 return;
1087 }
1088 tevent_req_set_callback(subreq, open_socket_out_connected, req);
1089 return;
1090 }
1091
1092 #ifdef EISCONN
1093 if (sys_errno == EISCONN) {
1094 tevent_req_done(req);
1095 return;
1096 }
1097 #endif
1098
1099 /* real error */
1100 tevent_req_nterror(req, map_nt_error_from_unix(sys_errno));
1101 }
1102
1103 NTSTATUS open_socket_out_recv(struct tevent_req *req, int *pfd)
1104 {
1105 struct open_socket_out_state *state =
1106 tevent_req_data(req, struct open_socket_out_state);
1107 NTSTATUS status;
1108
1109 if (tevent_req_is_nterror(req, &status)) {
1110 return status;
1111 }
1112 *pfd = state->fd;
1113 state->fd = -1;
1114 return NT_STATUS_OK;
1115 }
1116
1117 NTSTATUS open_socket_out(const struct sockaddr_storage *pss, uint16_t port,
1118 int timeout, int *pfd)
1119 {
1120 TALLOC_CTX *frame = talloc_stackframe();
1121 struct event_context *ev;
1122 struct tevent_req *req;
1123 NTSTATUS status = NT_STATUS_NO_MEMORY;
1124
1125 ev = event_context_init(frame);
1126 if (ev == NULL) {
1127 goto fail;
1128 }
1129
1130 req = open_socket_out_send(frame, ev, pss, port, timeout);
1131 if (req == NULL) {
1132 goto fail;
1133 }
1134 if (!tevent_req_poll(req, ev)) {
1135 status = NT_STATUS_INTERNAL_ERROR;
1136 goto fail;
1137 }
1138 status = open_socket_out_recv(req, pfd);
1139 fail:
1140 TALLOC_FREE(frame);
1141 return status;
1142 }
1143
1144 struct open_socket_out_defer_state {
1145 struct event_context *ev;
1146 struct sockaddr_storage ss;
1147 uint16_t port;
1148 int timeout;
1149 int fd;
1150 };
1151
1152 static void open_socket_out_defer_waited(struct tevent_req *subreq);
1153 static void open_socket_out_defer_connected(struct tevent_req *subreq);
1154
1155 struct tevent_req *open_socket_out_defer_send(TALLOC_CTX *mem_ctx,
1156 struct event_context *ev,
1157 struct timeval wait_time,
1158 const struct sockaddr_storage *pss,
1159 uint16_t port,
1160 int timeout)
1161 {
1162 struct tevent_req *req, *subreq;
1163 struct open_socket_out_defer_state *state;
1164
1165 req = tevent_req_create(mem_ctx, &state,
1166 struct open_socket_out_defer_state);
1167 if (req == NULL) {
1168 return NULL;
1169 }
1170 state->ev = ev;
1171 state->ss = *pss;
1172 state->port = port;
1173 state->timeout = timeout;
1174
1175 subreq = tevent_wakeup_send(
1176 state, ev,
1177 timeval_current_ofs(wait_time.tv_sec, wait_time.tv_usec));
1178 if (subreq == NULL) {
1179 goto fail;
1180 }
1181 tevent_req_set_callback(subreq, open_socket_out_defer_waited, req);
1182 return req;
1183 fail:
1184 TALLOC_FREE(req);
1185 return NULL;
1186 }
1187
1188 static void open_socket_out_defer_waited(struct tevent_req *subreq)
1189 {
1190 struct tevent_req *req = tevent_req_callback_data(
1191 subreq, struct tevent_req);
1192 struct open_socket_out_defer_state *state = tevent_req_data(
1193 req, struct open_socket_out_defer_state);
1194 bool ret;
1195
1196 ret = tevent_wakeup_recv(subreq);
1197 TALLOC_FREE(subreq);
1198 if (!ret) {
1199 tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
1200 return;
1201 }
1202
1203 subreq = open_socket_out_send(state, state->ev, &state->ss,
1204 state->port, state->timeout);
1205 if (tevent_req_nomem(subreq, req)) {
1206 return;
1207 }
1208 tevent_req_set_callback(subreq, open_socket_out_defer_connected, req);
1209 }
1210
1211 static void open_socket_out_defer_connected(struct tevent_req *subreq)
1212 {
1213 struct tevent_req *req = tevent_req_callback_data(
1214 subreq, struct tevent_req);
1215 struct open_socket_out_defer_state *state = tevent_req_data(
1216 req, struct open_socket_out_defer_state);
1217 NTSTATUS status;
1218
1219 status = open_socket_out_recv(subreq, &state->fd);
1220 TALLOC_FREE(subreq);
1221 if (!NT_STATUS_IS_OK(status)) {
1222 tevent_req_nterror(req, status);
1223 return;
1224 }
1225 tevent_req_done(req);
1226 }
1227
1228 NTSTATUS open_socket_out_defer_recv(struct tevent_req *req, int *pfd)
1229 {
1230 struct open_socket_out_defer_state *state = tevent_req_data(
1231 req, struct open_socket_out_defer_state);
1232 NTSTATUS status;
1233
1234 if (tevent_req_is_nterror(req, &status)) {
1235 return status;
1236 }
1237 *pfd = state->fd;
1238 state->fd = -1;
1239 return NT_STATUS_OK;
1240 }
1241
1242 /*******************************************************************
1243 Create an outgoing TCP socket to the first addr that connects.
1244
1245 This is for simultaneous connection attempts to port 445 and 139 of a host
1246 or for simultatneous connection attempts to multiple DCs at once. We return
1247 a socket fd of the first successful connection.
1248
1249 @param[in] addrs list of Internet addresses and ports to connect to
1250 @param[in] num_addrs number of address/port pairs in the addrs list
1251 @param[in] timeout time after which we stop waiting for a socket connection
1252 to succeed, given in milliseconds
1253 @param[out] fd_index the entry in addrs which we successfully connected to
1254 @param[out] fd fd of the open and connected socket
1255 @return true on a successful connection, false if all connection attempts
1256 failed or we timed out
1257 *******************************************************************/
1258
1259 bool open_any_socket_out(struct sockaddr_storage *addrs, int num_addrs,
1260 int timeout, int *fd_index, int *fd)
1261 {
1262 int i, resulting_index, res;
1263 int *sockets;
1264 bool good_connect;
1265
1266 fd_set r_fds, wr_fds;
1267 struct timeval tv;
1268 int maxfd;
1269
1270 int connect_loop = 10000; /* 10 milliseconds */
1271
1272 timeout *= 1000; /* convert to microseconds */
1273
1274 sockets = SMB_MALLOC_ARRAY(int, num_addrs);
1275
1276 if (sockets == NULL)
1277 return false;
1278
1279 resulting_index = -1;
1280
1281 for (i=0; i<num_addrs; i++)
1282 sockets[i] = -1;
1283
1284 for (i=0; i<num_addrs; i++) {
1285 sockets[i] = socket(addrs[i].ss_family, SOCK_STREAM, 0);
1286 if (sockets[i] < 0)
1287 goto done;
1288 set_blocking(sockets[i], false);
1289 }
1290
1291 connect_again:
1292 good_connect = false;
1293
1294 for (i=0; i<num_addrs; i++) {
1295 const struct sockaddr * a =
1296 (const struct sockaddr *)&(addrs[i]);
1297
1298 if (sockets[i] == -1)
1299 continue;
1300
1301 if (sys_connect(sockets[i], a) == 0) {
1302 /* Rather unlikely as we are non-blocking, but it
1303 * might actually happen. */
1304 resulting_index = i;
1305 goto done;
1306 }
1307
1308 if (errno == EINPROGRESS || errno == EALREADY ||
1309 #ifdef EISCONN
1310 errno == EISCONN ||
1311 #endif
1312 errno == EAGAIN || errno == EINTR) {
1313 /* These are the error messages that something is
1314 progressing. */
1315 good_connect = true;
1316 } else if (errno != 0) {
1317 /* There was a direct error */
1318 close(sockets[i]);
1319 sockets[i] = -1;
1320 }
1321 }
1322
1323 if (!good_connect) {
1324 /* All of the connect's resulted in real error conditions */
1325 goto done;
1326 }
1327
1328 /* Lets see if any of the connect attempts succeeded */
1329
1330 maxfd = 0;
1331 FD_ZERO(&wr_fds);
1332 FD_ZERO(&r_fds);
1333
1334 for (i=0; i<num_addrs; i++) {
1335 if (sockets[i] == -1)
1336 continue;
1337 FD_SET(sockets[i], &wr_fds);
1338 FD_SET(sockets[i], &r_fds);
1339 if (sockets[i]>maxfd)
1340 maxfd = sockets[i];
1341 }
1342
1343 tv.tv_sec = 0;
1344 tv.tv_usec = connect_loop;
1345
1346 res = sys_select_intr(maxfd+1, &r_fds, &wr_fds, NULL, &tv);
1347
1348 if (res < 0)
1349 goto done;
1350
1351 if (res == 0)
1352 goto next_round;
1353
1354 for (i=0; i<num_addrs; i++) {
1355
1356 if (sockets[i] == -1)
1357 continue;
1358
1359 /* Stevens, Network Programming says that if there's a
1360 * successful connect, the socket is only writable. Upon an
1361 * error, it's both readable and writable. */
1362
1363 if (FD_ISSET(sockets[i], &r_fds) &&
1364 FD_ISSET(sockets[i], &wr_fds)) {
1365 /* readable and writable, so it's an error */
1366 close(sockets[i]);
1367 sockets[i] = -1;
1368 continue;
1369 }
1370
1371 if (!FD_ISSET(sockets[i], &r_fds) &&
1372 FD_ISSET(sockets[i], &wr_fds)) {
1373 /* Only writable, so it's connected */
1374 resulting_index = i;
1375 goto done;
1376 }
1377 }
1378
1379 next_round:
1380
1381 timeout -= connect_loop;
1382 if (timeout <= 0)
1383 goto done;
1384 connect_loop *= 1.5;
1385 if (connect_loop > timeout)
1386 connect_loop = timeout;
1387 goto connect_again;
1388
1389 done:
1390 for (i=0; i<num_addrs; i++) {
1391 if (i == resulting_index)
1392 continue;
1393 if (sockets[i] >= 0)
1394 close(sockets[i]);
1395 }
1396
1397 if (resulting_index >= 0) {
1398 *fd_index = resulting_index;
1399 *fd = sockets[*fd_index];
1400 set_blocking(*fd, true);
1401 }
1402
1403 free(sockets);
1404
1405 return (resulting_index >= 0);
1406 }
1407 /****************************************************************************
1408 Open a connected UDP socket to host on port
1409 **************************************************************************/
1410
1411 int open_udp_socket(const char *host, int port)
1412 {
1413 int type = SOCK_DGRAM;
1414 struct sockaddr_in sock_out;
1415 int res;
1416 struct in_addr addr;
1417
1418 addr = interpret_addr2(host);
1419
1420 res = socket(PF_INET, type, 0);
1421 if (res == -1) {
1422 return -1;
1423 }
1424
1425 memset((char *)&sock_out,'\0',sizeof(sock_out));
1426 putip((char *)&sock_out.sin_addr,(char *)&addr);
1427 sock_out.sin_port = htons(port);
1428 sock_out.sin_family = PF_INET;
1429
1430 if (sys_connect(res,(struct sockaddr *)&sock_out)) {
1431 close(res);
1432 return -1;
1433 }
1434
1435 return res;
1436 }
1437
1438 /*******************************************************************
1439 Return the IP addr of the remote end of a socket as a string.
1440 Optionally return the struct sockaddr_storage.
1441 ******************************************************************/
1442
1443 static const char *get_peer_addr_internal(int fd,
1444 char *addr_buf,
1445 size_t addr_buf_len,
1446 struct sockaddr *pss,
1447 socklen_t *plength)
1448 {
1449 struct sockaddr_storage ss;
1450 socklen_t length = sizeof(ss);
1451
1452 strlcpy(addr_buf,"0.0.0.0",addr_buf_len);
1453
1454 if (fd == -1) {
1455 return addr_buf;
1456 }
1457
1458 if (pss == NULL) {
1459 pss = (struct sockaddr *)&ss;
1460 plength = &length;
1461 }
1462
1463 if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) {
1464 DEBUG(0,("getpeername failed. Error was %s\n",
1465 strerror(errno) ));
1466 return addr_buf;
1467 }
1468
1469 print_sockaddr_len(addr_buf,
1470 addr_buf_len,
1471 pss,
1472 *plength);
1473 return addr_buf;
1474 }
1475
1476 /*******************************************************************
1477 Matchname - determine if host name matches IP address. Used to
1478 confirm a hostname lookup to prevent spoof attacks.
1479 ******************************************************************/
1480
1481 static bool matchname(const char *remotehost,
1482 const struct sockaddr *pss,
1483 socklen_t len)
1484 {
1485 struct addrinfo *res = NULL;
1486 struct addrinfo *ailist = NULL;
1487 char addr_buf[INET6_ADDRSTRLEN];
1488 bool ret = interpret_string_addr_internal(&ailist,
1489 remotehost,
1490 AI_ADDRCONFIG|AI_CANONNAME);
1491
1492 if (!ret || ailist == NULL) {
1493 DEBUG(3,("matchname: getaddrinfo failed for "
1494 "name %s [%s]\n",
1495 remotehost,
1496 gai_strerror(ret) ));
1497 return false;
1498 }
1499
1500 /*
1501 * Make sure that getaddrinfo() returns the "correct" host name.
1502 */
1503
1504 if (ailist->ai_canonname == NULL ||
1505 (!strequal(remotehost, ailist->ai_canonname) &&
1506 !strequal(remotehost, "localhost"))) {
1507 DEBUG(0,("matchname: host name/name mismatch: %s != %s\n",
1508 remotehost,
1509 ailist->ai_canonname ?
1510 ailist->ai_canonname : "(NULL)"));
1511 freeaddrinfo(ailist);
1512 return false;
1513 }
1514
1515 /* Look up the host address in the address list we just got. */
1516 for (res = ailist; res; res = res->ai_next) {
1517 if (!res->ai_addr) {
1518 continue;
1519 }
1520 if (sockaddr_equal((const struct sockaddr *)res->ai_addr,
1521 (struct sockaddr *)pss)) {
1522 freeaddrinfo(ailist);
1523 return true;
1524 }
1525 }
1526
1527 /*
1528 * The host name does not map to the original host address. Perhaps
1529 * someone has compromised a name server. More likely someone botched
1530 * it, but that could be dangerous, too.
1531 */
1532
1533 DEBUG(0,("matchname: host name/address mismatch: %s != %s\n",
1534 print_sockaddr_len(addr_buf,
1535 sizeof(addr_buf),
1536 pss,
1537 len),
1538 ailist->ai_canonname ? ailist->ai_canonname : "(NULL)"));
1539
1540 if (ailist) {
1541 freeaddrinfo(ailist);
1542 }
1543 return false;
1544 }
1545
1546 /*******************************************************************
1547 Deal with the singleton cache.
1548 ******************************************************************/
1549
1550 struct name_addr_pair {
1551 struct sockaddr_storage ss;
1552 const char *name;
1553 };
1554
1555 /*******************************************************************
1556 Lookup a name/addr pair. Returns memory allocated from memcache.
1557 ******************************************************************/
1558
1559 static bool lookup_nc(struct name_addr_pair *nc)
1560 {
1561 DATA_BLOB tmp;
1562
1563 ZERO_STRUCTP(nc);
1564
1565 if (!memcache_lookup(
1566 NULL, SINGLETON_CACHE,
1567 data_blob_string_const_null("get_peer_name"),
1568 &tmp)) {
1569 return false;
1570 }
1571
1572 memcpy(&nc->ss, tmp.data, sizeof(nc->ss));
1573 nc->name = (const char *)tmp.data + sizeof(nc->ss);
1574 return true;
1575 }
1576
1577 /*******************************************************************
1578 Save a name/addr pair.
1579 ******************************************************************/
1580
1581 static void store_nc(const struct name_addr_pair *nc)
1582 {
1583 DATA_BLOB tmp;
1584 size_t namelen = strlen(nc->name);
1585
1586 tmp = data_blob(NULL, sizeof(nc->ss) + namelen + 1);
1587 if (!tmp.data) {
1588 return;
1589 }
1590 memcpy(tmp.data, &nc->ss, sizeof(nc->ss));
1591 memcpy(tmp.data+sizeof(nc->ss), nc->name, namelen+1);
1592
1593 memcache_add(NULL, SINGLETON_CACHE,
1594 data_blob_string_const_null("get_peer_name"),
1595 tmp);
1596 data_blob_free(&tmp);
1597 }
1598
1599 /*******************************************************************
1600 Return the DNS name of the remote end of a socket.
1601 ******************************************************************/
1602
1603 const char *get_peer_name(int fd, bool force_lookup)
1604 {
1605 struct name_addr_pair nc;
1606 char addr_buf[INET6_ADDRSTRLEN];
1607 struct sockaddr_storage ss;
1608 socklen_t length = sizeof(ss);
1609 const char *p;
1610 int ret;
1611 char name_buf[MAX_DNS_NAME_LENGTH];
1612 char tmp_name[MAX_DNS_NAME_LENGTH];
1613
1614 /* reverse lookups can be *very* expensive, and in many
1615 situations won't work because many networks don't link dhcp
1616 with dns. To avoid the delay we avoid the lookup if
1617 possible */
1618 if (!lp_hostname_lookups() && (force_lookup == false)) {
1619 length = sizeof(nc.ss);
1620 nc.name = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf),
1621 (struct sockaddr *)&nc.ss, &length);
1622 store_nc(&nc);
1623 lookup_nc(&nc);
1624 return nc.name ? nc.name : "UNKNOWN";
1625 }
1626
1627 lookup_nc(&nc);
1628
1629 memset(&ss, '\0', sizeof(ss));
1630 p = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf), (struct sockaddr *)&ss, &length);
1631
1632 /* it might be the same as the last one - save some DNS work */
1633 if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&nc.ss)) {
1634 return nc.name ? nc.name : "UNKNOWN";
1635 }
1636
1637 /* Not the same. We need to lookup. */
1638 if (fd == -1) {
1639 return "UNKNOWN";
1640 }
1641
1642 /* Look up the remote host name. */
1643 ret = sys_getnameinfo((struct sockaddr *)&ss,
1644 length,
1645 name_buf,
1646 sizeof(name_buf),
1647 NULL,
1648 0,
1649 0);
1650
1651 if (ret) {
1652 DEBUG(1,("get_peer_name: getnameinfo failed "
1653 "for %s with error %s\n",
1654 p,
1655 gai_strerror(ret)));
1656 strlcpy(name_buf, p, sizeof(name_buf));
1657 } else {
1658 if (!matchname(name_buf, (struct sockaddr *)&ss, length)) {
1659 DEBUG(0,("Matchname failed on %s %s\n",name_buf,p));
1660 strlcpy(name_buf,"UNKNOWN",sizeof(name_buf));
1661 }
1662 }
1663
1664 /* can't pass the same source and dest strings in when you
1665 use --enable-developer or the clobber_region() call will
1666 get you */
1667
1668 strlcpy(tmp_name, name_buf, sizeof(tmp_name));
1669 alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
1670 if (strstr(name_buf,"..")) {
1671 strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1672 }
1673
1674 nc.name = name_buf;
1675 nc.ss = ss;
1676
1677 store_nc(&nc);
1678 lookup_nc(&nc);
1679 return nc.name ? nc.name : "UNKNOWN";
1680 }
1681
1682 /*******************************************************************
1683 Return the IP addr of the remote end of a socket as a string.
1684 ******************************************************************/
1685
1686 const char *get_peer_addr(int fd, char *addr, size_t addr_len)
1687 {
1688 return get_peer_addr_internal(fd, addr, addr_len, NULL, NULL);
1689 }
1690
1691 /*******************************************************************
1692 Create protected unix domain socket.
1693
1694 Some unixes cannot set permissions on a ux-dom-sock, so we
1695 have to make sure that the directory contains the protection
1696 permissions instead.
1697 ******************************************************************/
1698
1699 int create_pipe_sock(const char *socket_dir,
1700 const char *socket_name,
1701 mode_t dir_perms)
1702 {
1703 #ifdef HAVE_UNIXSOCKET
1704 struct sockaddr_un sunaddr;
1705 struct stat st;
1706 int sock;
1707 mode_t old_umask;
1708 char *path = NULL;
1709
1710 old_umask = umask(0);
1711
1712 /* Create the socket directory or reuse the existing one */
1713
1714 if (lstat(socket_dir, &st) == -1) {
1715 if (errno == ENOENT) {
1716 /* Create directory */
1717 if (mkdir(socket_dir, dir_perms) == -1) {
1718 DEBUG(0, ("error creating socket directory "
1719 "%s: %s\n", socket_dir,
1720 strerror(errno)));
1721 goto out_umask;
1722 }
1723 } else {
1724 DEBUG(0, ("lstat failed on socket directory %s: %s\n",
1725 socket_dir, strerror(errno)));
1726 goto out_umask;
1727 }
1728 } else {
1729 /* Check ownership and permission on existing directory */
1730 if (!S_ISDIR(st.st_mode)) {
1731 DEBUG(0, ("socket directory %s isn't a directory\n",
1732 socket_dir));
1733 goto out_umask;
1734 }
1735 if ((st.st_uid != sec_initial_uid()) ||
1736 ((st.st_mode & 0777) != dir_perms)) {
1737 DEBUG(0, ("invalid permissions on socket directory "
1738 "%s\n", socket_dir));
1739 goto out_umask;
1740 }
1741 }
1742
1743 /* Create the socket file */
1744
1745 sock = socket(AF_UNIX, SOCK_STREAM, 0);
1746
1747 if (sock == -1) {
1748 DEBUG(0, ("create_pipe_sock: socket error %s\n",
1749 strerror(errno) ));
1750 goto out_close;
1751 }
1752
1753 if (asprintf(&path, "%s/%s", socket_dir, socket_name) == -1) {
1754 goto out_close;
1755 }
1756
1757 unlink(path);
1758 memset(&sunaddr, 0, sizeof(sunaddr));
1759 sunaddr.sun_family = AF_UNIX;
1760 strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path));
1761
1762 if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1763 DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
1764 strerror(errno)));
1765 goto out_close;
1766 }
1767
1768 if (listen(sock, 5) == -1) {
1769 DEBUG(0, ("listen failed on pipe socket %s: %s\n", path,
1770 strerror(errno)));
1771 goto out_close;
1772 }
1773
1774 SAFE_FREE(path);
1775
1776 umask(old_umask);
1777 return sock;
1778
1779 out_close:
1780 SAFE_FREE(path);
1781 if (sock != -1)
1782 close(sock);
1783
1784 out_umask:
1785 umask(old_umask);
1786 return -1;
1787
1788 #else
1789 DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
1790 return -1;
1791 #endif /* HAVE_UNIXSOCKET */
1792 }
1793
1794 /****************************************************************************
1795 Get my own canonical name, including domain.
1796 ****************************************************************************/
1797
1798 const char *get_mydnsfullname(void)
1799 {
1800 struct addrinfo *res = NULL;
1801 char my_hostname[HOST_NAME_MAX];
1802 bool ret;
1803 DATA_BLOB tmp;
1804
1805 if (memcache_lookup(NULL, SINGLETON_CACHE,
1806 data_blob_string_const_null("get_mydnsfullname"),
1807 &tmp)) {
1808 SMB_ASSERT(tmp.length > 0);
1809 return (const char *)tmp.data;
1810 }
1811
1812 /* get my host name */
1813 if (gethostname(my_hostname, sizeof(my_hostname)) == -1) {
1814 DEBUG(0,("get_mydnsfullname: gethostname failed\n"));
1815 return NULL;
1816 }
1817
1818 /* Ensure null termination. */
1819 my_hostname[sizeof(my_hostname)-1] = '\0';
1820
1821 ret = interpret_string_addr_internal(&res,
1822 my_hostname,
1823 AI_ADDRCONFIG|AI_CANONNAME);
1824
1825 if (!ret || res == NULL) {
1826 DEBUG(3,("get_mydnsfullname: getaddrinfo failed for "
1827 "name %s [%s]\n",
1828 my_hostname,
1829 gai_strerror(ret) ));
1830 return NULL;
1831 }
1832
1833 /*
1834 * Make sure that getaddrinfo() returns the "correct" host name.
1835 */
1836
1837 if (res->ai_canonname == NULL) {
1838 DEBUG(3,("get_mydnsfullname: failed to get "
1839 "canonical name for %s\n",
1840 my_hostname));
1841 freeaddrinfo(res);
1842 return NULL;
1843 }
1844
1845 /* This copies the data, so we must do a lookup
1846 * afterwards to find the value to return.
1847 */
1848
1849 memcache_add(NULL, SINGLETON_CACHE,
1850 data_blob_string_const_null("get_mydnsfullname"),
1851 data_blob_string_const_null(res->ai_canonname));
1852
1853 if (!memcache_lookup(NULL, SINGLETON_CACHE,
1854 data_blob_string_const_null("get_mydnsfullname"),
1855 &tmp)) {
1856 tmp = data_blob_talloc(talloc_tos(), res->ai_canonname,
1857 strlen(res->ai_canonname) + 1);
1858 }
1859
1860 freeaddrinfo(res);
1861
1862 return (const char *)tmp.data;
1863 }
1864
1865 /************************************************************
1866 Is this my name ?
1867 ************************************************************/
1868
1869 bool is_myname_or_ipaddr(const char *s)
1870 {
1871 TALLOC_CTX *ctx = talloc_tos();
1872 char addr[INET6_ADDRSTRLEN];
1873 char *name = NULL;
1874 const char *dnsname;
1875 char *servername = NULL;
1876
1877 if (!s) {
1878 return false;
1879 }
1880
1881 /* Santize the string from '\\name' */
1882 name = talloc_strdup(ctx, s);
1883 if (!name) {
1884 return false;
1885 }
1886
1887 servername = strrchr_m(name, '\\' );
1888 if (!servername) {
1889 servername = name;
1890 } else {
1891 servername++;
1892 }
1893
1894 /* Optimize for the common case */
1895 if (strequal(servername, global_myname())) {
1896 return true;
1897 }
1898
1899 /* Check for an alias */
1900 if (is_myname(servername)) {
1901 return true;
1902 }
1903
1904 /* Check for loopback */
1905 if (strequal(servername, "127.0.0.1") ||
1906 strequal(servername, "::1")) {
1907 return true;
1908 }
1909
1910 if (strequal(servername, "localhost")) {
1911 return true;
1912 }
1913
1914 /* Maybe it's my dns name */
1915 dnsname = get_mydnsfullname();
1916 if (dnsname && strequal(servername, dnsname)) {
1917 return true;
1918 }
1919
1920 /* Handle possible CNAME records - convert to an IP addr. */
1921 if (!is_ipaddress(servername)) {
1922 /* Use DNS to resolve the name, but only the first address */
1923 struct sockaddr_storage ss;
1924 if (interpret_string_addr(&ss, servername, 0)) {
1925 print_sockaddr(addr,
1926 sizeof(addr),
1927 &ss);
1928 servername = addr;
1929 }
1930 }
1931
1932 /* Maybe its an IP address? */
1933 if (is_ipaddress(servername)) {
1934 struct sockaddr_storage ss;
1935 struct iface_struct *nics;
1936 int i, n;
1937
1938 if (!interpret_string_addr(&ss, servername, AI_NUMERICHOST)) {
1939 return false;
1940 }
1941
1942 if (ismyaddr((struct sockaddr *)&ss)) {
1943 return true;
1944 }
1945
1946 if (is_zero_addr((struct sockaddr *)&ss) ||
1947 is_loopback_addr((struct sockaddr *)&ss)) {
1948 return false;
1949 }
1950
1951 nics = TALLOC_ARRAY(ctx, struct iface_struct,
1952 MAX_INTERFACES);
1953 if (!nics) {
1954 return false;
1955 }
1956 n = get_interfaces(nics, MAX_INTERFACES);
1957 for (i=0; i<n; i++) {
1958 if (sockaddr_equal((struct sockaddr *)&nics[i].ip, (struct sockaddr *)&ss)) {
1959 TALLOC_FREE(nics);
1960 return true;
1961 }
1962 }
1963 TALLOC_FREE(nics);
1964 }
1965
1966 /* No match */
1967 return false;
1968 }
1969
1970 /*
1971 * Read an smb packet asynchronously, discard keepalives
1972 */
1973
1974 struct read_smb_state {
1975 struct tevent_context *ev;
1976 int fd;
1977 uint8_t *buf;
1978 };
1979
1980 static ssize_t read_smb_more(uint8_t *buf, size_t buflen, void *private_data);
1981 static void read_smb_done(struct tevent_req *subreq);
1982
1983 struct tevent_req *read_smb_send(TALLOC_CTX *mem_ctx,
1984 struct tevent_context *ev,
1985 int fd)
1986 {
1987 struct tevent_req *result, *subreq;
1988 struct read_smb_state *state;
1989
1990 result = tevent_req_create(mem_ctx, &state, struct read_smb_state);
1991 if (result == NULL) {
1992 return NULL;
1993 }
1994 state->ev = ev;
1995 state->fd = fd;
1996
1997 subreq = read_packet_send(state, ev, fd, 4, read_smb_more, NULL);
1998 if (subreq == NULL) {
1999 goto fail;
2000 }
2001 tevent_req_set_callback(subreq, read_smb_done, result);
2002 return result;
2003 fail:
2004 TALLOC_FREE(result);
2005 return NULL;
2006 }
2007
2008 static ssize_t read_smb_more(uint8_t *buf, size_t buflen, void *private_data)
2009 {
2010 if (buflen > 4) {
2011 return 0; /* We've been here, we're done */
2012 }
2013 return smb_len_large(buf);
2014 }
2015
2016 static void read_smb_done(struct tevent_req *subreq)
2017 {
2018 struct tevent_req *req = tevent_req_callback_data(
2019 subreq, struct tevent_req);
2020 struct read_smb_state *state = tevent_req_data(
2021 req, struct read_smb_state);
2022 ssize_t len;
2023 int err;
2024
2025 len = read_packet_recv(subreq, state, &state->buf, &err);
2026 TALLOC_FREE(subreq);
2027 if (len == -1) {
2028 tevent_req_error(req, err);
2029 return;
2030 }
2031
2032 if (CVAL(state->buf, 0) == SMBkeepalive) {
2033 subreq = read_packet_send(state, state->ev, state->fd, 4,
2034 read_smb_more, NULL);
2035 if (tevent_req_nomem(subreq, req)) {
2036 return;
2037 }
2038 tevent_req_set_callback(subreq, read_smb_done, req);
2039 return;
2040 }
2041 tevent_req_done(req);
2042 }
2043
2044 ssize_t read_smb_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
2045 uint8_t **pbuf, int *perrno)
2046 {
2047 struct read_smb_state *state = tevent_req_data(
2048 req, struct read_smb_state);
2049
2050 if (tevent_req_is_unix_error(req, perrno)) {
2051 return -1;
2052 }
2053 *pbuf = talloc_move(mem_ctx, &state->buf);
2054 return talloc_get_size(*pbuf);
2055 }
2056
2057 struct getaddrinfo_state {
2058 const char *node;
2059 const char *service;
2060 const struct addrinfo *hints;
2061 struct addrinfo *res;
2062 int ret;
2063 };
2064
2065 static void getaddrinfo_do(void *private_data);
2066 static void getaddrinfo_done(struct tevent_req *subreq);
2067
2068 struct tevent_req *getaddrinfo_send(TALLOC_CTX *mem_ctx,
2069 struct tevent_context *ev,
2070 struct fncall_context *ctx,
2071 const char *node,
2072 const char *service,
2073 const struct addrinfo *hints)
2074 {
2075 struct tevent_req *req, *subreq;
2076 struct getaddrinfo_state *state;
2077
2078 req = tevent_req_create(mem_ctx, &state, struct getaddrinfo_state);
2079 if (req == NULL) {
2080 return NULL;
2081 }
2082
2083 state->node = node;
2084 state->service = service;
2085 state->hints = hints;
2086
2087 subreq = fncall_send(state, ev, ctx, getaddrinfo_do, state);
2088 if (tevent_req_nomem(subreq, req)) {
2089 return tevent_req_post(req, ev);
2090 }
2091 tevent_req_set_callback(subreq, getaddrinfo_done, req);
2092 return req;
2093 }
2094
2095 static void getaddrinfo_do(void *private_data)
2096 {
2097 struct getaddrinfo_state *state =
2098 (struct getaddrinfo_state *)private_data;
2099
2100 state->ret = getaddrinfo(state->node, state->service, state->hints,
2101 &state->res);
2102 }
2103
2104 static void getaddrinfo_done(struct tevent_req *subreq)
2105 {
2106 struct tevent_req *req = tevent_req_callback_data(
2107 subreq, struct tevent_req);
2108 int ret, err;
2109
2110 ret = fncall_recv(subreq, &err);
2111 TALLOC_FREE(subreq);
2112 if (ret == -1) {
2113 tevent_req_error(req, err);
2114 return;
2115 }
2116 tevent_req_done(req);
2117 }
2118
2119 int getaddrinfo_recv(struct tevent_req *req, struct addrinfo **res)
2120 {
2121 struct getaddrinfo_state *state = tevent_req_data(
2122 req, struct getaddrinfo_state);
2123 int err;
2124
2125 if (tevent_req_is_unix_error(req, &err)) {
2126 switch(err) {
2127 case ENOMEM:
2128 return EAI_MEMORY;
2129 default:
2130 return EAI_FAIL;
2131 }
2132 }
2133 if (state->ret == 0) {
2134 *res = state->res;
2135 }
2136 return state->ret;
2137 }
reg import