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IDL: Add autogenerated nbt files.
[Samba/gebeck_regimport.git] / source3 / lib / util_sock.c
blobf252377b7ed88a03318c75c48e4c6c075a52f8bd
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 Return true if a string could be an IPv4 address.
26 ****************************************************************************/
27
28 bool is_ipaddress_v4(const char *str)
29 {
30 int ret = -1;
31 struct in_addr dest;
32
33 ret = inet_pton(AF_INET, str, &dest);
34 if (ret > 0) {
35 return true;
36 }
37 return false;
38 }
39
40 /****************************************************************************
41 Return true if a string could be an IPv4 or IPv6 address.
42 ****************************************************************************/
43
44 bool is_ipaddress(const char *str)
45 {
46 int ret = -1;
47
48 #if defined(HAVE_IPV6)
49 if (strchr_m(str, ':')) {
50 char addr[INET6_ADDRSTRLEN];
51 struct in6_addr dest6;
52 const char *sp = str;
53 char *p = strchr_m(str, '%');
54
55 /*
56 * Cope with link-local.
57 * This is IP:v6:addr%ifname.
58 */
59
60 if (p && (p > str) && (if_nametoindex(p+1) != 0)) {
61 strlcpy(addr, str,
62 MIN(PTR_DIFF(p,str)+1,
63 sizeof(addr)));
64 sp = addr;
65 }
66 ret = inet_pton(AF_INET6, sp, &dest6);
67 if (ret > 0) {
68 return true;
69 }
70 }
71 #endif
72 return is_ipaddress_v4(str);
73 }
74
75 /****************************************************************************
76 Is a sockaddr_storage a broadcast address ?
77 ****************************************************************************/
78
79 bool is_broadcast_addr(const struct sockaddr_storage *pss)
80 {
81 #if defined(HAVE_IPV6)
82 if (pss->ss_family == AF_INET6) {
83 const struct in6_addr *sin6 =
84 &((const struct sockaddr_in6 *)pss)->sin6_addr;
85 return IN6_IS_ADDR_MULTICAST(sin6);
86 }
87 #endif
88 if (pss->ss_family == AF_INET) {
89 uint32_t addr =
90 ntohl(((const struct sockaddr_in *)pss)->sin_addr.s_addr);
91 return addr == INADDR_BROADCAST;
92 }
93 return false;
94 }
95
96 /*******************************************************************
97 Wrap getaddrinfo...
98 ******************************************************************/
99
100 static bool interpret_string_addr_internal(struct addrinfo **ppres,
101 const char *str, int flags)
102 {
103 int ret;
104 struct addrinfo hints;
105
106 memset(&hints, '\0', sizeof(hints));
107 /* By default make sure it supports TCP. */
108 hints.ai_socktype = SOCK_STREAM;
109 hints.ai_flags = flags;
110
111 /* Linux man page on getaddinfo() says port will be
112 uninitialized when service string in NULL */
113
114 ret = getaddrinfo(str, NULL,
115 &hints,
116 ppres);
117
118 if (ret) {
119 DEBUG(3,("interpret_string_addr_internal: getaddrinfo failed "
120 "for name %s [%s]\n",
121 str,
122 gai_strerror(ret) ));
123 return false;
124 }
125 return true;
126 }
127
128 /****************************************************************************
129 Interpret an internet address or name into an IP address in 4 byte form.
130 RETURNS IN NETWORK BYTE ORDER (big endian).
131 ****************************************************************************/
132
133 uint32 interpret_addr(const char *str)
134 {
135 uint32 ret;
136
137 /* If it's in the form of an IP address then
138 * get the lib to interpret it */
139 if (is_ipaddress_v4(str)) {
140 struct in_addr dest;
141
142 if (inet_pton(AF_INET, str, &dest) <= 0) {
143 /* Error - this shouldn't happen ! */
144 DEBUG(0,("interpret_addr: inet_pton failed "
145 "host %s\n",
146 str));
147 return 0;
148 }
149 ret = dest.s_addr; /* NETWORK BYTE ORDER ! */
150 } else {
151 /* Otherwise assume it's a network name of some sort and use
152 getadddrinfo. */
153 struct addrinfo *res = NULL;
154 struct addrinfo *res_list = NULL;
155 if (!interpret_string_addr_internal(&res_list,
156 str,
157 AI_ADDRCONFIG)) {
158 DEBUG(3,("interpret_addr: Unknown host. %s\n",str));
159 return 0;
160 }
161
162 /* Find the first IPv4 address. */
163 for (res = res_list; res; res = res->ai_next) {
164 if (res->ai_family != AF_INET) {
165 continue;
166 }
167 if (res->ai_addr == NULL) {
168 continue;
169 }
170 break;
171 }
172 if(res == NULL) {
173 DEBUG(3,("interpret_addr: host address is "
174 "invalid for host %s\n",str));
175 if (res_list) {
176 freeaddrinfo(res_list);
177 }
178 return 0;
179 }
180 putip((char *)&ret,
181 &((struct sockaddr_in *)res->ai_addr)->sin_addr.s_addr);
182 if (res_list) {
183 freeaddrinfo(res_list);
184 }
185 }
186
187 /* This is so bogus - all callers need fixing... JRA. */
188 if (ret == (uint32)-1) {
189 return 0;
190 }
191
192 return ret;
193 }
194
195 /*******************************************************************
196 A convenient addition to interpret_addr().
197 ******************************************************************/
198
199 struct in_addr *interpret_addr2(struct in_addr *ip, const char *str)
200 {
201 uint32 a = interpret_addr(str);
202 ip->s_addr = a;
203 return ip;
204 }
205
206 /*******************************************************************
207 Map a text hostname or IP address (IPv4 or IPv6) into a
208 struct sockaddr_storage.
209 ******************************************************************/
210
211 bool interpret_string_addr(struct sockaddr_storage *pss,
212 const char *str,
213 int flags)
214 {
215 char addr[INET6_ADDRSTRLEN];
216 struct addrinfo *res = NULL;
217 #if defined(HAVE_IPV6)
218 unsigned int scope_id = 0;
219
220 if (strchr_m(str, ':')) {
221 char *p = strchr_m(str, '%');
222
223 /*
224 * Cope with link-local.
225 * This is IP:v6:addr%ifname.
226 */
227
228 if (p && (p > str) && ((scope_id = if_nametoindex(p+1)) != 0)) {
229 strlcpy(addr, str,
230 MIN(PTR_DIFF(p,str)+1,
231 sizeof(addr)));
232 str = addr;
233 }
234 }
235 #endif
236
237 zero_addr(pss);
238
239 if (!interpret_string_addr_internal(&res, str, flags|AI_ADDRCONFIG)) {
240 return false;
241 }
242 if (!res) {
243 return false;
244 }
245 /* Copy the first sockaddr. */
246 memcpy(pss, res->ai_addr, res->ai_addrlen);
247
248 #if defined(HAVE_IPV6)
249 if (pss->ss_family == AF_INET6 && scope_id) {
250 struct sockaddr_in6 *ps6 = (struct sockaddr_in6 *)pss;
251 if (IN6_IS_ADDR_LINKLOCAL(&ps6->sin6_addr) &&
252 ps6->sin6_scope_id == 0) {
253 ps6->sin6_scope_id = scope_id;
254 }
255 }
256 #endif
257
258 freeaddrinfo(res);
259 return true;
260 }
261
262 /*******************************************************************
263 Check if an IPv7 is 127.0.0.1
264 ******************************************************************/
265
266 bool is_loopback_ip_v4(struct in_addr ip)
267 {
268 struct in_addr a;
269 a.s_addr = htonl(INADDR_LOOPBACK);
270 return(ip.s_addr == a.s_addr);
271 }
272
273 /*******************************************************************
274 Check if a struct sockaddr_storage is the loopback address.
275 ******************************************************************/
276
277 bool is_loopback_addr(const struct sockaddr_storage *pss)
278 {
279 #if defined(HAVE_IPV6)
280 if (pss->ss_family == AF_INET6) {
281 struct in6_addr *pin6 =
282 &((struct sockaddr_in6 *)pss)->sin6_addr;
283 return IN6_IS_ADDR_LOOPBACK(pin6);
284 }
285 #endif
286 if (pss->ss_family == AF_INET) {
287 struct in_addr *pin = &((struct sockaddr_in *)pss)->sin_addr;
288 return is_loopback_ip_v4(*pin);
289 }
290 return false;
291 }
292
293 /*******************************************************************
294 Check if an IPv4 is 0.0.0.0.
295 ******************************************************************/
296
297 bool is_zero_ip_v4(struct in_addr ip)
298 {
299 uint32 a;
300 putip((char *)&a,(char *)&ip);
301 return(a == 0);
302 }
303
304 /*******************************************************************
305 Check if a struct sockaddr_storage has an unspecified address.
306 ******************************************************************/
307
308 bool is_zero_addr(const struct sockaddr_storage *pss)
309 {
310 #if defined(HAVE_IPV6)
311 if (pss->ss_family == AF_INET6) {
312 struct in6_addr *pin6 =
313 &((struct sockaddr_in6 *)pss)->sin6_addr;
314 return IN6_IS_ADDR_UNSPECIFIED(pin6);
315 }
316 #endif
317 if (pss->ss_family == AF_INET) {
318 struct in_addr *pin = &((struct sockaddr_in *)pss)->sin_addr;
319 return is_zero_ip_v4(*pin);
320 }
321 return false;
322 }
323
324 /*******************************************************************
325 Set an IP to 0.0.0.0.
326 ******************************************************************/
327
328 void zero_ip_v4(struct in_addr *ip)
329 {
330 memset(ip, '\0', sizeof(struct in_addr));
331 }
332
333 /*******************************************************************
334 Set an address to INADDR_ANY.
335 ******************************************************************/
336
337 void zero_addr(struct sockaddr_storage *pss)
338 {
339 memset(pss, '\0', sizeof(*pss));
340 /* Ensure we're at least a valid sockaddr-storage. */
341 pss->ss_family = AF_INET;
342 }
343
344 /*******************************************************************
345 Are two IPs on the same subnet - IPv4 version ?
346 ********************************************************************/
347
348 bool same_net_v4(struct in_addr ip1,struct in_addr ip2,struct in_addr mask)
349 {
350 uint32 net1,net2,nmask;
351
352 nmask = ntohl(mask.s_addr);
353 net1 = ntohl(ip1.s_addr);
354 net2 = ntohl(ip2.s_addr);
355
356 return((net1 & nmask) == (net2 & nmask));
357 }
358
359 /*******************************************************************
360 Convert an IPv4 struct in_addr to a struct sockaddr_storage.
361 ********************************************************************/
362
363 void in_addr_to_sockaddr_storage(struct sockaddr_storage *ss,
364 struct in_addr ip)
365 {
366 struct sockaddr_in *sa = (struct sockaddr_in *)ss;
367 memset(ss, '\0', sizeof(*ss));
368 ss->ss_family = AF_INET;
369 sa->sin_addr = ip;
370 }
371
372 #if defined(HAVE_IPV6)
373 /*******************************************************************
374 Convert an IPv6 struct in_addr to a struct sockaddr_storage.
375 ********************************************************************/
376
377 void in6_addr_to_sockaddr_storage(struct sockaddr_storage *ss,
378 struct in6_addr ip)
379 {
380 struct sockaddr_in6 *sa = (struct sockaddr_in6 *)ss;
381 memset(ss, '\0', sizeof(*ss));
382 ss->ss_family = AF_INET6;
383 sa->sin6_addr = ip;
384 }
385 #endif
386
387 /*******************************************************************
388 Are two IPs on the same subnet?
389 ********************************************************************/
390
391 bool same_net(const struct sockaddr_storage *ip1,
392 const struct sockaddr_storage *ip2,
393 const struct sockaddr_storage *mask)
394 {
395 if (ip1->ss_family != ip2->ss_family) {
396 /* Never on the same net. */
397 return false;
398 }
399
400 #if defined(HAVE_IPV6)
401 if (ip1->ss_family == AF_INET6) {
402 struct sockaddr_in6 ip1_6 = *(struct sockaddr_in6 *)ip1;
403 struct sockaddr_in6 ip2_6 = *(struct sockaddr_in6 *)ip2;
404 struct sockaddr_in6 mask_6 = *(struct sockaddr_in6 *)mask;
405 char *p1 = (char *)&ip1_6.sin6_addr;
406 char *p2 = (char *)&ip2_6.sin6_addr;
407 char *m = (char *)&mask_6.sin6_addr;
408 int i;
409
410 for (i = 0; i < sizeof(struct in6_addr); i++) {
411 *p1++ &= *m;
412 *p2++ &= *m;
413 m++;
414 }
415 return (memcmp(&ip1_6.sin6_addr,
416 &ip2_6.sin6_addr,
417 sizeof(struct in6_addr)) == 0);
418 }
419 #endif
420 if (ip1->ss_family == AF_INET) {
421 return same_net_v4(((const struct sockaddr_in *)ip1)->sin_addr,
422 ((const struct sockaddr_in *)ip2)->sin_addr,
423 ((const struct sockaddr_in *)mask)->sin_addr);
424 }
425 return false;
426 }
427
428 /*******************************************************************
429 Are two sockaddr_storage's the same family and address ? Ignore port etc.
430 ********************************************************************/
431
432 bool addr_equal(const struct sockaddr_storage *ip1,
433 const struct sockaddr_storage *ip2)
434 {
435 if (ip1->ss_family != ip2->ss_family) {
436 /* Never the same. */
437 return false;
438 }
439
440 #if defined(HAVE_IPV6)
441 if (ip1->ss_family == AF_INET6) {
442 return (memcmp(&((const struct sockaddr_in6 *)ip1)->sin6_addr,
443 &((const struct sockaddr_in6 *)ip2)->sin6_addr,
444 sizeof(struct in6_addr)) == 0);
445 }
446 #endif
447 if (ip1->ss_family == AF_INET) {
448 return (memcmp(&((const struct sockaddr_in *)ip1)->sin_addr,
449 &((const struct sockaddr_in *)ip2)->sin_addr,
450 sizeof(struct in_addr)) == 0);
451 }
452 return false;
453 }
454
455 /****************************************************************************
456 Is an IP address the INADDR_ANY or in6addr_any value ?
457 ****************************************************************************/
458
459 bool is_address_any(const struct sockaddr_storage *psa)
460 {
461 #if defined(HAVE_IPV6)
462 if (psa->ss_family == AF_INET6) {
463 struct sockaddr_in6 *si6 = (struct sockaddr_in6 *)psa;
464 if (memcmp(&in6addr_any,
465 &si6->sin6_addr,
466 sizeof(in6addr_any)) == 0) {
467 return true;
468 }
469 return false;
470 }
471 #endif
472 if (psa->ss_family == AF_INET) {
473 struct sockaddr_in *si = (struct sockaddr_in *)psa;
474 if (si->sin_addr.s_addr == INADDR_ANY) {
475 return true;
476 }
477 return false;
478 }
479 return false;
480 }
481
482 /****************************************************************************
483 Get a port number in host byte order from a sockaddr_storage.
484 ****************************************************************************/
485
486 uint16_t get_sockaddr_port(const struct sockaddr_storage *pss)
487 {
488 uint16_t port = 0;
489
490 if (pss->ss_family != AF_INET) {
491 #if defined(HAVE_IPV6)
492 /* IPv6 */
493 const struct sockaddr_in6 *sa6 =
494 (const struct sockaddr_in6 *)pss;
495 port = ntohs(sa6->sin6_port);
496 #endif
497 } else {
498 const struct sockaddr_in *sa =
499 (const struct sockaddr_in *)pss;
500 port = ntohs(sa->sin_port);
501 }
502 return port;
503 }
504
505 /****************************************************************************
506 Print out an IPv4 or IPv6 address from a struct sockaddr_storage.
507 ****************************************************************************/
508
509 static char *print_sockaddr_len(char *dest,
510 size_t destlen,
511 const struct sockaddr_storage *psa,
512 socklen_t psalen)
513 {
514 if (destlen > 0) {
515 dest[0] = '\0';
516 }
517 (void)sys_getnameinfo((const struct sockaddr *)psa,
518 psalen,
519 dest, destlen,
520 NULL, 0,
521 NI_NUMERICHOST);
522 return dest;
523 }
524
525 /****************************************************************************
526 Print out an IPv4 or IPv6 address from a struct sockaddr_storage.
527 ****************************************************************************/
528
529 char *print_sockaddr(char *dest,
530 size_t destlen,
531 const struct sockaddr_storage *psa)
532 {
533 return print_sockaddr_len(dest, destlen, psa,
534 sizeof(struct sockaddr_storage));
535 }
536
537 /****************************************************************************
538 Print out a canonical IPv4 or IPv6 address from a struct sockaddr_storage.
539 ****************************************************************************/
540
541 char *print_canonical_sockaddr(TALLOC_CTX *ctx,
542 const struct sockaddr_storage *pss)
543 {
544 char addr[INET6_ADDRSTRLEN];
545 char *dest = NULL;
546 int ret;
547
548 /* Linux getnameinfo() man pages says port is unitialized if
549 service name is NULL. */
550
551 ret = sys_getnameinfo((const struct sockaddr *)pss,
552 sizeof(struct sockaddr_storage),
553 addr, sizeof(addr),
554 NULL, 0,
555 NI_NUMERICHOST);
556 if (ret != 0) {
557 return NULL;
558 }
559
560 if (pss->ss_family != AF_INET) {
561 #if defined(HAVE_IPV6)
562 dest = talloc_asprintf(ctx, "[%s]", addr);
563 #else
564 return NULL;
565 #endif
566 } else {
567 dest = talloc_asprintf(ctx, "%s", addr);
568 }
569
570 return dest;
571 }
572
573 /****************************************************************************
574 Return the string of an IP address (IPv4 or IPv6).
575 ****************************************************************************/
576
577 static const char *get_socket_addr(int fd, char *addr_buf, size_t addr_len)
578 {
579 struct sockaddr_storage sa;
580 socklen_t length = sizeof(sa);
581
582 /* Ok, returning a hard coded IPv4 address
583 * is bogus, but it's just as bogus as a
584 * zero IPv6 address. No good choice here.
585 */
586
587 strlcpy(addr_buf, "0.0.0.0", addr_len);
588
589 if (fd == -1) {
590 return addr_buf;
591 }
592
593 if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) {
594 DEBUG(0,("getsockname failed. Error was %s\n",
595 strerror(errno) ));
596 return addr_buf;
597 }
598
599 return print_sockaddr_len(addr_buf, addr_len, &sa, length);
600 }
601
602 #if 0
603 /* Not currently used. JRA. */
604 /****************************************************************************
605 Return the port number we've bound to on a socket.
606 ****************************************************************************/
607
608 static int get_socket_port(int fd)
609 {
610 struct sockaddr_storage sa;
611 socklen_t length = sizeof(sa);
612
613 if (fd == -1) {
614 return -1;
615 }
616
617 if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) {
618 DEBUG(0,("getpeername failed. Error was %s\n",
619 strerror(errno) ));
620 return -1;
621 }
622
623 #if defined(HAVE_IPV6)
624 if (sa.ss_family == AF_INET6) {
625 return ntohs(((struct sockaddr_in6 *)&sa)->sin6_port);
626 }
627 #endif
628 if (sa.ss_family == AF_INET) {
629 return ntohs(((struct sockaddr_in *)&sa)->sin_port);
630 }
631 return -1;
632 }
633 #endif
634
635 void set_sockaddr_port(struct sockaddr_storage *psa, uint16 port)
636 {
637 #if defined(HAVE_IPV6)
638 if (psa->ss_family == AF_INET6) {
639 ((struct sockaddr_in6 *)psa)->sin6_port = htons(port);
640 }
641 #endif
642 if (psa->ss_family == AF_INET) {
643 ((struct sockaddr_in *)psa)->sin_port = htons(port);
644 }
645 }
646
647 const char *client_name(int fd)
648 {
649 return get_peer_name(fd,false);
650 }
651
652 const char *client_addr(int fd, char *addr, size_t addrlen)
653 {
654 return get_peer_addr(fd,addr,addrlen);
655 }
656
657 const char *client_socket_addr(int fd, char *addr, size_t addr_len)
658 {
659 return get_socket_addr(fd, addr, addr_len);
660 }
661
662 #if 0
663 /* Not currently used. JRA. */
664 int client_socket_port(int fd)
665 {
666 return get_socket_port(fd);
667 }
668 #endif
669
670 /****************************************************************************
671 Accessor functions to make thread-safe code easier later...
672 ****************************************************************************/
673
674 void set_smb_read_error(enum smb_read_errors *pre,
675 enum smb_read_errors newerr)
676 {
677 if (pre) {
678 *pre = newerr;
679 }
680 }
681
682 void cond_set_smb_read_error(enum smb_read_errors *pre,
683 enum smb_read_errors newerr)
684 {
685 if (pre && *pre == SMB_READ_OK) {
686 *pre = newerr;
687 }
688 }
689
690 /****************************************************************************
691 Determine if a file descriptor is in fact a socket.
692 ****************************************************************************/
693
694 bool is_a_socket(int fd)
695 {
696 int v;
697 socklen_t l;
698 l = sizeof(int);
699 return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
700 }
701
702 enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON};
703
704 typedef struct smb_socket_option {
705 const char *name;
706 int level;
707 int option;
708 int value;
709 int opttype;
710 } smb_socket_option;
711
712 static const smb_socket_option socket_options[] = {
713 {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL},
714 {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL},
715 {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL},
716 #ifdef TCP_NODELAY
717 {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL},
718 #endif
719 #ifdef TCP_KEEPCNT
720 {"TCP_KEEPCNT", IPPROTO_TCP, TCP_KEEPCNT, 0, OPT_INT},
721 #endif
722 #ifdef TCP_KEEPIDLE
723 {"TCP_KEEPIDLE", IPPROTO_TCP, TCP_KEEPIDLE, 0, OPT_INT},
724 #endif
725 #ifdef TCP_KEEPINTVL
726 {"TCP_KEEPINTVL", IPPROTO_TCP, TCP_KEEPINTVL, 0, OPT_INT},
727 #endif
728 #ifdef IPTOS_LOWDELAY
729 {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON},
730 #endif
731 #ifdef IPTOS_THROUGHPUT
732 {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON},
733 #endif
734 #ifdef SO_REUSEPORT
735 {"SO_REUSEPORT", SOL_SOCKET, SO_REUSEPORT, 0, OPT_BOOL},
736 #endif
737 #ifdef SO_SNDBUF
738 {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT},
739 #endif
740 #ifdef SO_RCVBUF
741 {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT},
742 #endif
743 #ifdef SO_SNDLOWAT
744 {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT},
745 #endif
746 #ifdef SO_RCVLOWAT
747 {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT},
748 #endif
749 #ifdef SO_SNDTIMEO
750 {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT},
751 #endif
752 #ifdef SO_RCVTIMEO
753 {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT},
754 #endif
755 #ifdef TCP_FASTACK
756 {"TCP_FASTACK", IPPROTO_TCP, TCP_FASTACK, 0, OPT_INT},
757 #endif
758 {NULL,0,0,0,0}};
759
760 /****************************************************************************
761 Print socket options.
762 ****************************************************************************/
763
764 static void print_socket_options(int s)
765 {
766 int value;
767 socklen_t vlen = 4;
768 const smb_socket_option *p = &socket_options[0];
769
770 /* wrapped in if statement to prevent streams
771 * leak in SCO Openserver 5.0 */
772 /* reported on samba-technical --jerry */
773 if ( DEBUGLEVEL >= 5 ) {
774 for (; p->name != NULL; p++) {
775 if (getsockopt(s, p->level, p->option,
776 (void *)&value, &vlen) == -1) {
777 DEBUG(5,("Could not test socket option %s.\n",
778 p->name));
779 } else {
780 DEBUG(5,("socket option %s = %d\n",
781 p->name,value));
782 }
783 }
784 }
785 }
786
787 /****************************************************************************
788 Set user socket options.
789 ****************************************************************************/
790
791 void set_socket_options(int fd, const char *options)
792 {
793 TALLOC_CTX *ctx = talloc_stackframe();
794 char *tok;
795
796 while (next_token_talloc(ctx, &options, &tok," \t,")) {
797 int ret=0,i;
798 int value = 1;
799 char *p;
800 bool got_value = false;
801
802 if ((p = strchr_m(tok,'='))) {
803 *p = 0;
804 value = atoi(p+1);
805 got_value = true;
806 }
807
808 for (i=0;socket_options[i].name;i++)
809 if (strequal(socket_options[i].name,tok))
810 break;
811
812 if (!socket_options[i].name) {
813 DEBUG(0,("Unknown socket option %s\n",tok));
814 continue;
815 }
816
817 switch (socket_options[i].opttype) {
818 case OPT_BOOL:
819 case OPT_INT:
820 ret = setsockopt(fd,socket_options[i].level,
821 socket_options[i].option,
822 (char *)&value,sizeof(int));
823 break;
824
825 case OPT_ON:
826 if (got_value)
827 DEBUG(0,("syntax error - %s "
828 "does not take a value\n",tok));
829
830 {
831 int on = socket_options[i].value;
832 ret = setsockopt(fd,socket_options[i].level,
833 socket_options[i].option,
834 (char *)&on,sizeof(int));
835 }
836 break;
837 }
838
839 if (ret != 0) {
840 /* be aware that some systems like Solaris return
841 * EINVAL to a setsockopt() call when the client
842 * sent a RST previously - no need to worry */
843 DEBUG(2,("Failed to set socket option %s (Error %s)\n",
844 tok, strerror(errno) ));
845 }
846 }
847
848 TALLOC_FREE(ctx);
849 print_socket_options(fd);
850 }
851
852 /****************************************************************************
853 Read from a socket.
854 ****************************************************************************/
855
856 ssize_t read_udp_v4_socket(int fd,
857 char *buf,
858 size_t len,
859 struct sockaddr_storage *psa)
860 {
861 ssize_t ret;
862 socklen_t socklen = sizeof(*psa);
863 struct sockaddr_in *si = (struct sockaddr_in *)psa;
864
865 memset((char *)psa,'\0',socklen);
866
867 ret = (ssize_t)sys_recvfrom(fd,buf,len,0,
868 (struct sockaddr *)psa,&socklen);
869 if (ret <= 0) {
870 /* Don't print a low debug error for a non-blocking socket. */
871 if (errno == EAGAIN) {
872 DEBUG(10,("read_udp_v4_socket: returned EAGAIN\n"));
873 } else {
874 DEBUG(2,("read_udp_v4_socket: failed. errno=%s\n",
875 strerror(errno)));
876 }
877 return 0;
878 }
879
880 if (psa->ss_family != AF_INET) {
881 DEBUG(2,("read_udp_v4_socket: invalid address family %d "
882 "(not IPv4)\n", (int)psa->ss_family));
883 return 0;
884 }
885
886 DEBUG(10,("read_udp_v4_socket: ip %s port %d read: %lu\n",
887 inet_ntoa(si->sin_addr),
888 si->sin_port,
889 (unsigned long)ret));
890
891 return ret;
892 }
893
894 /****************************************************************************
895 Read data from a socket with a timout in msec.
896 mincount = if timeout, minimum to read before returning
897 maxcount = number to be read.
898 time_out = timeout in milliseconds
899 ****************************************************************************/
900
901 NTSTATUS read_socket_with_timeout(int fd, char *buf,
902 size_t mincnt, size_t maxcnt,
903 unsigned int time_out,
904 size_t *size_ret)
905 {
906 fd_set fds;
907 int selrtn;
908 ssize_t readret;
909 size_t nread = 0;
910 struct timeval timeout;
911 char addr[INET6_ADDRSTRLEN];
912
913 /* just checking .... */
914 if (maxcnt <= 0)
915 return NT_STATUS_OK;
916
917 /* Blocking read */
918 if (time_out == 0) {
919 if (mincnt == 0) {
920 mincnt = maxcnt;
921 }
922
923 while (nread < mincnt) {
924 readret = sys_read(fd, buf + nread, maxcnt - nread);
925
926 if (readret == 0) {
927 DEBUG(5,("read_socket_with_timeout: "
928 "blocking read. EOF from client.\n"));
929 return NT_STATUS_END_OF_FILE;
930 }
931
932 if (readret == -1) {
933 if (fd == get_client_fd()) {
934 /* Try and give an error message
935 * saying what client failed. */
936 DEBUG(0,("read_socket_with_timeout: "
937 "client %s read error = %s.\n",
938 get_peer_addr(fd,addr,sizeof(addr)),
939 strerror(errno) ));
940 } else {
941 DEBUG(0,("read_socket_with_timeout: "
942 "read error = %s.\n",
943 strerror(errno) ));
944 }
945 return map_nt_error_from_unix(errno);
946 }
947 nread += readret;
948 }
949 goto done;
950 }
951
952 /* Most difficult - timeout read */
953 /* If this is ever called on a disk file and
954 mincnt is greater then the filesize then
955 system performance will suffer severely as
956 select always returns true on disk files */
957
958 /* Set initial timeout */
959 timeout.tv_sec = (time_t)(time_out / 1000);
960 timeout.tv_usec = (long)(1000 * (time_out % 1000));
961
962 for (nread=0; nread < mincnt; ) {
963 FD_ZERO(&fds);
964 FD_SET(fd,&fds);
965
966 selrtn = sys_select_intr(fd+1,&fds,NULL,NULL,&timeout);
967
968 /* Check if error */
969 if (selrtn == -1) {
970 /* something is wrong. Maybe the socket is dead? */
971 if (fd == get_client_fd()) {
972 /* Try and give an error message saying
973 * what client failed. */
974 DEBUG(0,("read_socket_with_timeout: timeout "
975 "read for client %s. select error = %s.\n",
976 get_peer_addr(fd,addr,sizeof(addr)),
977 strerror(errno) ));
978 } else {
979 DEBUG(0,("read_socket_with_timeout: timeout "
980 "read. select error = %s.\n",
981 strerror(errno) ));
982 }
983 return map_nt_error_from_unix(errno);
984 }
985
986 /* Did we timeout ? */
987 if (selrtn == 0) {
988 DEBUG(10,("read_socket_with_timeout: timeout read. "
989 "select timed out.\n"));
990 return NT_STATUS_IO_TIMEOUT;
991 }
992
993 readret = sys_read(fd, buf+nread, maxcnt-nread);
994
995 if (readret == 0) {
996 /* we got EOF on the file descriptor */
997 DEBUG(5,("read_socket_with_timeout: timeout read. "
998 "EOF from client.\n"));
999 return NT_STATUS_END_OF_FILE;
1000 }
1001
1002 if (readret == -1) {
1003 /* the descriptor is probably dead */
1004 if (fd == get_client_fd()) {
1005 /* Try and give an error message
1006 * saying what client failed. */
1007 DEBUG(0,("read_socket_with_timeout: timeout "
1008 "read to client %s. read error = %s.\n",
1009 get_peer_addr(fd,addr,sizeof(addr)),
1010 strerror(errno) ));
1011 } else {
1012 DEBUG(0,("read_socket_with_timeout: timeout "
1013 "read. read error = %s.\n",
1014 strerror(errno) ));
1015 }
1016 return map_nt_error_from_unix(errno);
1017 }
1018
1019 nread += readret;
1020 }
1021
1022 done:
1023 /* Return the number we got */
1024 if (size_ret) {
1025 *size_ret = nread;
1026 }
1027 return NT_STATUS_OK;
1028 }
1029
1030 /****************************************************************************
1031 Read data from the client, reading exactly N bytes.
1032 ****************************************************************************/
1033
1034 NTSTATUS read_data(int fd, char *buffer, size_t N)
1035 {
1036 return read_socket_with_timeout(fd, buffer, N, N, 0, NULL);
1037 }
1038
1039 /****************************************************************************
1040 Write data to a fd.
1041 ****************************************************************************/
1042
1043 ssize_t write_data(int fd, const char *buffer, size_t N)
1044 {
1045 size_t total=0;
1046 ssize_t ret;
1047 char addr[INET6_ADDRSTRLEN];
1048
1049 while (total < N) {
1050 ret = sys_write(fd,buffer + total,N - total);
1051
1052 if (ret == -1) {
1053 if (fd == get_client_fd()) {
1054 /* Try and give an error message saying
1055 * what client failed. */
1056 DEBUG(0,("write_data: write failure in "
1057 "writing to client %s. Error %s\n",
1058 get_peer_addr(fd,addr,sizeof(addr)),
1059 strerror(errno) ));
1060 } else {
1061 DEBUG(0,("write_data: write failure. "
1062 "Error = %s\n", strerror(errno) ));
1063 }
1064 return -1;
1065 }
1066
1067 if (ret == 0) {
1068 return total;
1069 }
1070
1071 total += ret;
1072 }
1073 return (ssize_t)total;
1074 }
1075
1076 /****************************************************************************
1077 Send a keepalive packet (rfc1002).
1078 ****************************************************************************/
1079
1080 bool send_keepalive(int client)
1081 {
1082 unsigned char buf[4];
1083
1084 buf[0] = SMBkeepalive;
1085 buf[1] = buf[2] = buf[3] = 0;
1086
1087 return(write_data(client,(char *)buf,4) == 4);
1088 }
1089
1090 /****************************************************************************
1091 Read 4 bytes of a smb packet and return the smb length of the packet.
1092 Store the result in the buffer.
1093 This version of the function will return a length of zero on receiving
1094 a keepalive packet.
1095 Timeout is in milliseconds.
1096 ****************************************************************************/
1097
1098 NTSTATUS read_smb_length_return_keepalive(int fd, char *inbuf,
1099 unsigned int timeout,
1100 size_t *len)
1101 {
1102 int msg_type;
1103 NTSTATUS status;
1104
1105 status = read_socket_with_timeout(fd, inbuf, 4, 4, timeout, NULL);
1106
1107 if (!NT_STATUS_IS_OK(status)) {
1108 return status;
1109 }
1110
1111 *len = smb_len(inbuf);
1112 msg_type = CVAL(inbuf,0);
1113
1114 if (msg_type == SMBkeepalive) {
1115 DEBUG(5,("Got keepalive packet\n"));
1116 }
1117
1118 DEBUG(10,("got smb length of %lu\n",(unsigned long)(*len)));
1119
1120 return NT_STATUS_OK;
1121 }
1122
1123 /****************************************************************************
1124 Read 4 bytes of a smb packet and return the smb length of the packet.
1125 Store the result in the buffer. This version of the function will
1126 never return a session keepalive (length of zero).
1127 Timeout is in milliseconds.
1128 ****************************************************************************/
1129
1130 NTSTATUS read_smb_length(int fd, char *inbuf, unsigned int timeout,
1131 size_t *len)
1132 {
1133 uint8_t msgtype = SMBkeepalive;
1134
1135 while (msgtype == SMBkeepalive) {
1136 NTSTATUS status;
1137
1138 status = read_smb_length_return_keepalive(fd, inbuf, timeout,
1139 len);
1140 if (!NT_STATUS_IS_OK(status)) {
1141 return status;
1142 }
1143
1144 msgtype = CVAL(inbuf, 0);
1145 }
1146
1147 DEBUG(10,("read_smb_length: got smb length of %lu\n",
1148 (unsigned long)len));
1149
1150 return NT_STATUS_OK;
1151 }
1152
1153 /****************************************************************************
1154 Read an smb from a fd. Note that the buffer *MUST* be of size
1155 BUFFER_SIZE+SAFETY_MARGIN.
1156 The timeout is in milliseconds.
1157 This function will return on receipt of a session keepalive packet.
1158 maxlen is the max number of bytes to return, not including the 4 byte
1159 length. If zero it means BUFFER_SIZE+SAFETY_MARGIN limit.
1160 Doesn't check the MAC on signed packets.
1161 ****************************************************************************/
1162
1163 NTSTATUS receive_smb_raw(int fd, char *buffer, unsigned int timeout,
1164 size_t maxlen, size_t *p_len)
1165 {
1166 size_t len;
1167 NTSTATUS status;
1168
1169 status = read_smb_length_return_keepalive(fd,buffer,timeout,&len);
1170
1171 if (!NT_STATUS_IS_OK(status)) {
1172 DEBUG(10, ("receive_smb_raw: %s!\n", nt_errstr(status)));
1173 return status;
1174 }
1175
1176 /*
1177 * A WRITEX with CAP_LARGE_WRITEX can be 64k worth of data plus 65 bytes
1178 * of header. Don't print the error if this fits.... JRA.
1179 */
1180
1181 if (len > (BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE)) {
1182 DEBUG(0,("Invalid packet length! (%lu bytes).\n",
1183 (unsigned long)len));
1184 if (len > BUFFER_SIZE + (SAFETY_MARGIN/2)) {
1185 return NT_STATUS_INVALID_PARAMETER;
1186 }
1187 }
1188
1189 if(len > 0) {
1190 if (maxlen) {
1191 len = MIN(len,maxlen);
1192 }
1193
1194 status = read_socket_with_timeout(
1195 fd, buffer+4, len, len, timeout, &len);
1196
1197 if (!NT_STATUS_IS_OK(status)) {
1198 return status;
1199 }
1200
1201 /* not all of samba3 properly checks for packet-termination
1202 * of strings. This ensures that we don't run off into
1203 * empty space. */
1204 SSVAL(buffer+4,len, 0);
1205 }
1206
1207 *p_len = len;
1208 return NT_STATUS_OK;
1209 }
1210
1211 /****************************************************************************
1212 Open a socket of the specified type, port, and address for incoming data.
1213 ****************************************************************************/
1214
1215 int open_socket_in(int type,
1216 uint16_t port,
1217 int dlevel,
1218 const struct sockaddr_storage *psock,
1219 bool rebind)
1220 {
1221 struct sockaddr_storage sock;
1222 int res;
1223 socklen_t slen = sizeof(struct sockaddr_in);
1224
1225 sock = *psock;
1226
1227 #if defined(HAVE_IPV6)
1228 if (sock.ss_family == AF_INET6) {
1229 ((struct sockaddr_in6 *)&sock)->sin6_port = htons(port);
1230 slen = sizeof(struct sockaddr_in6);
1231 }
1232 #endif
1233 if (sock.ss_family == AF_INET) {
1234 ((struct sockaddr_in *)&sock)->sin_port = htons(port);
1235 }
1236
1237 res = socket(sock.ss_family, type, 0 );
1238 if( res == -1 ) {
1239 if( DEBUGLVL(0) ) {
1240 dbgtext( "open_socket_in(): socket() call failed: " );
1241 dbgtext( "%s\n", strerror( errno ) );
1242 }
1243 return -1;
1244 }
1245
1246 /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
1247 {
1248 int val = rebind ? 1 : 0;
1249 if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,
1250 (char *)&val,sizeof(val)) == -1 ) {
1251 if( DEBUGLVL( dlevel ) ) {
1252 dbgtext( "open_socket_in(): setsockopt: " );
1253 dbgtext( "SO_REUSEADDR = %s ",
1254 val?"true":"false" );
1255 dbgtext( "on port %d failed ", port );
1256 dbgtext( "with error = %s\n", strerror(errno) );
1257 }
1258 }
1259 #ifdef SO_REUSEPORT
1260 if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,
1261 (char *)&val,sizeof(val)) == -1 ) {
1262 if( DEBUGLVL( dlevel ) ) {
1263 dbgtext( "open_socket_in(): setsockopt: ");
1264 dbgtext( "SO_REUSEPORT = %s ",
1265 val?"true":"false");
1266 dbgtext( "on port %d failed ", port);
1267 dbgtext( "with error = %s\n", strerror(errno));
1268 }
1269 }
1270 #endif /* SO_REUSEPORT */
1271 }
1272
1273 /* now we've got a socket - we need to bind it */
1274 if (bind(res, (struct sockaddr *)&sock, slen) == -1 ) {
1275 if( DEBUGLVL(dlevel) && (port == SMB_PORT1 ||
1276 port == SMB_PORT2 || port == NMB_PORT) ) {
1277 char addr[INET6_ADDRSTRLEN];
1278 print_sockaddr(addr, sizeof(addr),
1279 &sock);
1280 dbgtext( "bind failed on port %d ", port);
1281 dbgtext( "socket_addr = %s.\n", addr);
1282 dbgtext( "Error = %s\n", strerror(errno));
1283 }
1284 close(res);
1285 return -1;
1286 }
1287
1288 DEBUG( 10, ( "bind succeeded on port %d\n", port ) );
1289 return( res );
1290 }
1291
1292 /****************************************************************************
1293 Create an outgoing socket. timeout is in milliseconds.
1294 **************************************************************************/
1295
1296 int open_socket_out(int type,
1297 const struct sockaddr_storage *pss,
1298 uint16_t port,
1299 int timeout)
1300 {
1301 char addr[INET6_ADDRSTRLEN];
1302 struct sockaddr_storage sock_out = *pss;
1303 int res,ret;
1304 int connect_loop = 10;
1305 int increment = 10;
1306
1307 /* create a socket to write to */
1308 res = socket(pss->ss_family, type, 0);
1309 if (res == -1) {
1310 DEBUG(0,("socket error (%s)\n", strerror(errno)));
1311 return -1;
1312 }
1313
1314 if (type != SOCK_STREAM) {
1315 return res;
1316 }
1317
1318 #if defined(HAVE_IPV6)
1319 if (pss->ss_family == AF_INET6) {
1320 struct sockaddr_in6 *psa6 = (struct sockaddr_in6 *)&sock_out;
1321 psa6->sin6_port = htons(port);
1322 if (psa6->sin6_scope_id == 0 &&
1323 IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
1324 setup_linklocal_scope_id(&sock_out);
1325 }
1326 }
1327 #endif
1328 if (pss->ss_family == AF_INET) {
1329 struct sockaddr_in *psa = (struct sockaddr_in *)&sock_out;
1330 psa->sin_port = htons(port);
1331 }
1332
1333 /* set it non-blocking */
1334 set_blocking(res,false);
1335
1336 print_sockaddr(addr, sizeof(addr), &sock_out);
1337 DEBUG(3,("Connecting to %s at port %u\n",
1338 addr,
1339 (unsigned int)port));
1340
1341 /* and connect it to the destination */
1342 connect_again:
1343
1344 ret = sys_connect(res, (struct sockaddr *)&sock_out);
1345
1346 /* Some systems return EAGAIN when they mean EINPROGRESS */
1347 if (ret < 0 && (errno == EINPROGRESS || errno == EALREADY ||
1348 errno == EAGAIN) && (connect_loop < timeout) ) {
1349 smb_msleep(connect_loop);
1350 timeout -= connect_loop;
1351 connect_loop += increment;
1352 if (increment < 250) {
1353 /* After 8 rounds we end up at a max of 255 msec */
1354 increment *= 1.5;
1355 }
1356 goto connect_again;
1357 }
1358
1359 if (ret < 0 && (errno == EINPROGRESS || errno == EALREADY ||
1360 errno == EAGAIN)) {
1361 DEBUG(1,("timeout connecting to %s:%u\n",
1362 addr,
1363 (unsigned int)port));
1364 close(res);
1365 return -1;
1366 }
1367
1368 #ifdef EISCONN
1369 if (ret < 0 && errno == EISCONN) {
1370 errno = 0;
1371 ret = 0;
1372 }
1373 #endif
1374
1375 if (ret < 0) {
1376 DEBUG(2,("error connecting to %s:%d (%s)\n",
1377 addr,
1378 (unsigned int)port,
1379 strerror(errno)));
1380 close(res);
1381 return -1;
1382 }
1383
1384 /* set it blocking again */
1385 set_blocking(res,true);
1386
1387 return res;
1388 }
1389
1390 /****************************************************************************
1391 Create an outgoing TCP socket to any of the addrs. This is for
1392 simultaneous connects to port 445 and 139 of a host or even a variety
1393 of DC's all of which are equivalent for our purposes.
1394 **************************************************************************/
1395
1396 bool open_any_socket_out(struct sockaddr_storage *addrs, int num_addrs,
1397 int timeout, int *fd_index, int *fd)
1398 {
1399 int i, resulting_index, res;
1400 int *sockets;
1401 bool good_connect;
1402
1403 fd_set r_fds, wr_fds;
1404 struct timeval tv;
1405 int maxfd;
1406
1407 int connect_loop = 10000; /* 10 milliseconds */
1408
1409 timeout *= 1000; /* convert to microseconds */
1410
1411 sockets = SMB_MALLOC_ARRAY(int, num_addrs);
1412
1413 if (sockets == NULL)
1414 return false;
1415
1416 resulting_index = -1;
1417
1418 for (i=0; i<num_addrs; i++)
1419 sockets[i] = -1;
1420
1421 for (i=0; i<num_addrs; i++) {
1422 sockets[i] = socket(addrs[i].ss_family, SOCK_STREAM, 0);
1423 if (sockets[i] < 0)
1424 goto done;
1425 set_blocking(sockets[i], false);
1426 }
1427
1428 connect_again:
1429 good_connect = false;
1430
1431 for (i=0; i<num_addrs; i++) {
1432 const struct sockaddr * a =
1433 (const struct sockaddr *)&(addrs[i]);
1434
1435 if (sockets[i] == -1)
1436 continue;
1437
1438 if (sys_connect(sockets[i], a) == 0) {
1439 /* Rather unlikely as we are non-blocking, but it
1440 * might actually happen. */
1441 resulting_index = i;
1442 goto done;
1443 }
1444
1445 if (errno == EINPROGRESS || errno == EALREADY ||
1446 #ifdef EISCONN
1447 errno == EISCONN ||
1448 #endif
1449 errno == EAGAIN || errno == EINTR) {
1450 /* These are the error messages that something is
1451 progressing. */
1452 good_connect = true;
1453 } else if (errno != 0) {
1454 /* There was a direct error */
1455 close(sockets[i]);
1456 sockets[i] = -1;
1457 }
1458 }
1459
1460 if (!good_connect) {
1461 /* All of the connect's resulted in real error conditions */
1462 goto done;
1463 }
1464
1465 /* Lets see if any of the connect attempts succeeded */
1466
1467 maxfd = 0;
1468 FD_ZERO(&wr_fds);
1469 FD_ZERO(&r_fds);
1470
1471 for (i=0; i<num_addrs; i++) {
1472 if (sockets[i] == -1)
1473 continue;
1474 FD_SET(sockets[i], &wr_fds);
1475 FD_SET(sockets[i], &r_fds);
1476 if (sockets[i]>maxfd)
1477 maxfd = sockets[i];
1478 }
1479
1480 tv.tv_sec = 0;
1481 tv.tv_usec = connect_loop;
1482
1483 res = sys_select_intr(maxfd+1, &r_fds, &wr_fds, NULL, &tv);
1484
1485 if (res < 0)
1486 goto done;
1487
1488 if (res == 0)
1489 goto next_round;
1490
1491 for (i=0; i<num_addrs; i++) {
1492
1493 if (sockets[i] == -1)
1494 continue;
1495
1496 /* Stevens, Network Programming says that if there's a
1497 * successful connect, the socket is only writable. Upon an
1498 * error, it's both readable and writable. */
1499
1500 if (FD_ISSET(sockets[i], &r_fds) &&
1501 FD_ISSET(sockets[i], &wr_fds)) {
1502 /* readable and writable, so it's an error */
1503 close(sockets[i]);
1504 sockets[i] = -1;
1505 continue;
1506 }
1507
1508 if (!FD_ISSET(sockets[i], &r_fds) &&
1509 FD_ISSET(sockets[i], &wr_fds)) {
1510 /* Only writable, so it's connected */
1511 resulting_index = i;
1512 goto done;
1513 }
1514 }
1515
1516 next_round:
1517
1518 timeout -= connect_loop;
1519 if (timeout <= 0)
1520 goto done;
1521 connect_loop *= 1.5;
1522 if (connect_loop > timeout)
1523 connect_loop = timeout;
1524 goto connect_again;
1525
1526 done:
1527 for (i=0; i<num_addrs; i++) {
1528 if (i == resulting_index)
1529 continue;
1530 if (sockets[i] >= 0)
1531 close(sockets[i]);
1532 }
1533
1534 if (resulting_index >= 0) {
1535 *fd_index = resulting_index;
1536 *fd = sockets[*fd_index];
1537 set_blocking(*fd, true);
1538 }
1539
1540 free(sockets);
1541
1542 return (resulting_index >= 0);
1543 }
1544 /****************************************************************************
1545 Open a connected UDP socket to host on port
1546 **************************************************************************/
1547
1548 int open_udp_socket(const char *host, int port)
1549 {
1550 int type = SOCK_DGRAM;
1551 struct sockaddr_in sock_out;
1552 int res;
1553 struct in_addr addr;
1554
1555 (void)interpret_addr2(&addr, host);
1556
1557 res = socket(PF_INET, type, 0);
1558 if (res == -1) {
1559 return -1;
1560 }
1561
1562 memset((char *)&sock_out,'\0',sizeof(sock_out));
1563 putip((char *)&sock_out.sin_addr,(char *)&addr);
1564 sock_out.sin_port = htons(port);
1565 sock_out.sin_family = PF_INET;
1566
1567 if (sys_connect(res,(struct sockaddr *)&sock_out)) {
1568 close(res);
1569 return -1;
1570 }
1571
1572 return res;
1573 }
1574
1575 /*******************************************************************
1576 Return the IP addr of the remote end of a socket as a string.
1577 Optionally return the struct sockaddr_storage.
1578 ******************************************************************/
1579
1580 static const char *get_peer_addr_internal(int fd,
1581 char *addr_buf,
1582 size_t addr_buf_len,
1583 struct sockaddr_storage *pss,
1584 socklen_t *plength)
1585 {
1586 struct sockaddr_storage ss;
1587 socklen_t length = sizeof(ss);
1588
1589 strlcpy(addr_buf,"0.0.0.0",addr_buf_len);
1590
1591 if (fd == -1) {
1592 return addr_buf;
1593 }
1594
1595 if (pss == NULL) {
1596 pss = &ss;
1597 }
1598 if (plength == NULL) {
1599 plength = &length;
1600 }
1601
1602 if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) {
1603 DEBUG(0,("getpeername failed. Error was %s\n",
1604 strerror(errno) ));
1605 return addr_buf;
1606 }
1607
1608 print_sockaddr_len(addr_buf,
1609 addr_buf_len,
1610 pss,
1611 *plength);
1612 return addr_buf;
1613 }
1614
1615 /*******************************************************************
1616 Matchname - determine if host name matches IP address. Used to
1617 confirm a hostname lookup to prevent spoof attacks.
1618 ******************************************************************/
1619
1620 static bool matchname(const char *remotehost,
1621 const struct sockaddr_storage *pss,
1622 socklen_t len)
1623 {
1624 struct addrinfo *res = NULL;
1625 struct addrinfo *ailist = NULL;
1626 char addr_buf[INET6_ADDRSTRLEN];
1627 bool ret = interpret_string_addr_internal(&ailist,
1628 remotehost,
1629 AI_ADDRCONFIG|AI_CANONNAME);
1630
1631 if (!ret || ailist == NULL) {
1632 DEBUG(3,("matchname: getaddrinfo failed for "
1633 "name %s [%s]\n",
1634 remotehost,
1635 gai_strerror(ret) ));
1636 return false;
1637 }
1638
1639 /*
1640 * Make sure that getaddrinfo() returns the "correct" host name.
1641 */
1642
1643 if (ailist->ai_canonname == NULL ||
1644 (!strequal(remotehost, ailist->ai_canonname) &&
1645 !strequal(remotehost, "localhost"))) {
1646 DEBUG(0,("matchname: host name/name mismatch: %s != %s\n",
1647 remotehost,
1648 ailist->ai_canonname ?
1649 ailist->ai_canonname : "(NULL)"));
1650 freeaddrinfo(ailist);
1651 return false;
1652 }
1653
1654 /* Look up the host address in the address list we just got. */
1655 for (res = ailist; res; res = res->ai_next) {
1656 if (!res->ai_addr) {
1657 continue;
1658 }
1659 if (addr_equal((const struct sockaddr_storage *)res->ai_addr,
1660 pss)) {
1661 freeaddrinfo(ailist);
1662 return true;
1663 }
1664 }
1665
1666 /*
1667 * The host name does not map to the original host address. Perhaps
1668 * someone has compromised a name server. More likely someone botched
1669 * it, but that could be dangerous, too.
1670 */
1671
1672 DEBUG(0,("matchname: host name/address mismatch: %s != %s\n",
1673 print_sockaddr_len(addr_buf,
1674 sizeof(addr_buf),
1675 pss,
1676 len),
1677 ailist->ai_canonname ? ailist->ai_canonname : "(NULL)"));
1678
1679 if (ailist) {
1680 freeaddrinfo(ailist);
1681 }
1682 return false;
1683 }
1684
1685 /*******************************************************************
1686 Deal with the singleton cache.
1687 ******************************************************************/
1688
1689 struct name_addr_pair {
1690 struct sockaddr_storage ss;
1691 const char *name;
1692 };
1693
1694 /*******************************************************************
1695 Lookup a name/addr pair. Returns memory allocated from memcache.
1696 ******************************************************************/
1697
1698 static bool lookup_nc(struct name_addr_pair *nc)
1699 {
1700 DATA_BLOB tmp;
1701
1702 ZERO_STRUCTP(nc);
1703
1704 if (!memcache_lookup(
1705 NULL, SINGLETON_CACHE,
1706 data_blob_string_const("get_peer_name"),
1707 &tmp)) {
1708 return false;
1709 }
1710
1711 memcpy(&nc->ss, tmp.data, sizeof(nc->ss));
1712 nc->name = (const char *)tmp.data + sizeof(nc->ss);
1713 return true;
1714 }
1715
1716 /*******************************************************************
1717 Save a name/addr pair.
1718 ******************************************************************/
1719
1720 static void store_nc(const struct name_addr_pair *nc)
1721 {
1722 DATA_BLOB tmp;
1723 size_t namelen = strlen(nc->name);
1724
1725 tmp = data_blob(NULL, sizeof(nc->ss) + namelen + 1);
1726 if (!tmp.data) {
1727 return;
1728 }
1729 memcpy(tmp.data, &nc->ss, sizeof(nc->ss));
1730 memcpy(tmp.data+sizeof(nc->ss), nc->name, namelen+1);
1731
1732 memcache_add(NULL, SINGLETON_CACHE,
1733 data_blob_string_const("get_peer_name"),
1734 tmp);
1735 data_blob_free(&tmp);
1736 }
1737
1738 /*******************************************************************
1739 Return the DNS name of the remote end of a socket.
1740 ******************************************************************/
1741
1742 const char *get_peer_name(int fd, bool force_lookup)
1743 {
1744 struct name_addr_pair nc;
1745 char addr_buf[INET6_ADDRSTRLEN];
1746 struct sockaddr_storage ss;
1747 socklen_t length = sizeof(ss);
1748 const char *p;
1749 int ret;
1750 char name_buf[MAX_DNS_NAME_LENGTH];
1751 char tmp_name[MAX_DNS_NAME_LENGTH];
1752
1753 /* reverse lookups can be *very* expensive, and in many
1754 situations won't work because many networks don't link dhcp
1755 with dns. To avoid the delay we avoid the lookup if
1756 possible */
1757 if (!lp_hostname_lookups() && (force_lookup == false)) {
1758 length = sizeof(nc.ss);
1759 nc.name = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf),
1760 &nc.ss, &length);
1761 store_nc(&nc);
1762 lookup_nc(&nc);
1763 return nc.name ? nc.name : "UNKNOWN";
1764 }
1765
1766 lookup_nc(&nc);
1767
1768 memset(&ss, '\0', sizeof(ss));
1769 p = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf), &ss, &length);
1770
1771 /* it might be the same as the last one - save some DNS work */
1772 if (addr_equal(&ss, &nc.ss)) {
1773 return nc.name ? nc.name : "UNKNOWN";
1774 }
1775
1776 /* Not the same. We need to lookup. */
1777 if (fd == -1) {
1778 return "UNKNOWN";
1779 }
1780
1781 /* Look up the remote host name. */
1782 ret = sys_getnameinfo((struct sockaddr *)&ss,
1783 length,
1784 name_buf,
1785 sizeof(name_buf),
1786 NULL,
1787 0,
1788 0);
1789
1790 if (ret) {
1791 DEBUG(1,("get_peer_name: getnameinfo failed "
1792 "for %s with error %s\n",
1793 p,
1794 gai_strerror(ret)));
1795 strlcpy(name_buf, p, sizeof(name_buf));
1796 } else {
1797 if (!matchname(name_buf, &ss, length)) {
1798 DEBUG(0,("Matchname failed on %s %s\n",name_buf,p));
1799 strlcpy(name_buf,"UNKNOWN",sizeof(name_buf));
1800 }
1801 }
1802
1803 /* can't pass the same source and dest strings in when you
1804 use --enable-developer or the clobber_region() call will
1805 get you */
1806
1807 strlcpy(tmp_name, name_buf, sizeof(tmp_name));
1808 alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
1809 if (strstr(name_buf,"..")) {
1810 strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
1811 }
1812
1813 nc.name = name_buf;
1814 nc.ss = ss;
1815
1816 store_nc(&nc);
1817 lookup_nc(&nc);
1818 return nc.name ? nc.name : "UNKNOWN";
1819 }
1820
1821 /*******************************************************************
1822 Return the IP addr of the remote end of a socket as a string.
1823 ******************************************************************/
1824
1825 const char *get_peer_addr(int fd, char *addr, size_t addr_len)
1826 {
1827 return get_peer_addr_internal(fd, addr, addr_len, NULL, NULL);
1828 }
1829
1830 /*******************************************************************
1831 Create protected unix domain socket.
1832
1833 Some unixes cannot set permissions on a ux-dom-sock, so we
1834 have to make sure that the directory contains the protection
1835 permissions instead.
1836 ******************************************************************/
1837
1838 int create_pipe_sock(const char *socket_dir,
1839 const char *socket_name,
1840 mode_t dir_perms)
1841 {
1842 #ifdef HAVE_UNIXSOCKET
1843 struct sockaddr_un sunaddr;
1844 struct stat st;
1845 int sock;
1846 mode_t old_umask;
1847 char *path = NULL;
1848
1849 old_umask = umask(0);
1850
1851 /* Create the socket directory or reuse the existing one */
1852
1853 if (lstat(socket_dir, &st) == -1) {
1854 if (errno == ENOENT) {
1855 /* Create directory */
1856 if (mkdir(socket_dir, dir_perms) == -1) {
1857 DEBUG(0, ("error creating socket directory "
1858 "%s: %s\n", socket_dir,
1859 strerror(errno)));
1860 goto out_umask;
1861 }
1862 } else {
1863 DEBUG(0, ("lstat failed on socket directory %s: %s\n",
1864 socket_dir, strerror(errno)));
1865 goto out_umask;
1866 }
1867 } else {
1868 /* Check ownership and permission on existing directory */
1869 if (!S_ISDIR(st.st_mode)) {
1870 DEBUG(0, ("socket directory %s isn't a directory\n",
1871 socket_dir));
1872 goto out_umask;
1873 }
1874 if ((st.st_uid != sec_initial_uid()) ||
1875 ((st.st_mode & 0777) != dir_perms)) {
1876 DEBUG(0, ("invalid permissions on socket directory "
1877 "%s\n", socket_dir));
1878 goto out_umask;
1879 }
1880 }
1881
1882 /* Create the socket file */
1883
1884 sock = socket(AF_UNIX, SOCK_STREAM, 0);
1885
1886 if (sock == -1) {
1887 DEBUG(0, ("create_pipe_sock: socket error %s\n",
1888 strerror(errno) ));
1889 goto out_close;
1890 }
1891
1892 if (asprintf(&path, "%s/%s", socket_dir, socket_name) == -1) {
1893 goto out_close;
1894 }
1895
1896 unlink(path);
1897 memset(&sunaddr, 0, sizeof(sunaddr));
1898 sunaddr.sun_family = AF_UNIX;
1899 strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path));
1900
1901 if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1902 DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
1903 strerror(errno)));
1904 goto out_close;
1905 }
1906
1907 if (listen(sock, 5) == -1) {
1908 DEBUG(0, ("listen failed on pipe socket %s: %s\n", path,
1909 strerror(errno)));
1910 goto out_close;
1911 }
1912
1913 SAFE_FREE(path);
1914
1915 umask(old_umask);
1916 return sock;
1917
1918 out_close:
1919 SAFE_FREE(path);
1920 if (sock != -1)
1921 close(sock);
1922
1923 out_umask:
1924 umask(old_umask);
1925 return -1;
1926
1927 #else
1928 DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
1929 return -1;
1930 #endif /* HAVE_UNIXSOCKET */
1931 }
1932
1933 /****************************************************************************
1934 Get my own canonical name, including domain.
1935 ****************************************************************************/
1936
1937 const char *get_mydnsfullname(void)
1938 {
1939 struct addrinfo *res = NULL;
1940 char my_hostname[HOST_NAME_MAX];
1941 bool ret;
1942 DATA_BLOB tmp;
1943
1944 if (memcache_lookup(NULL, SINGLETON_CACHE,
1945 data_blob_string_const("get_mydnsfullname"),
1946 &tmp)) {
1947 SMB_ASSERT(tmp.length > 0);
1948 return (const char *)tmp.data;
1949 }
1950
1951 /* get my host name */
1952 if (gethostname(my_hostname, sizeof(my_hostname)) == -1) {
1953 DEBUG(0,("get_mydnsfullname: gethostname failed\n"));
1954 return NULL;
1955 }
1956
1957 /* Ensure null termination. */
1958 my_hostname[sizeof(my_hostname)-1] = '\0';
1959
1960 ret = interpret_string_addr_internal(&res,
1961 my_hostname,
1962 AI_ADDRCONFIG|AI_CANONNAME);
1963
1964 if (!ret || res == NULL) {
1965 DEBUG(3,("get_mydnsfullname: getaddrinfo failed for "
1966 "name %s [%s]\n",
1967 my_hostname,
1968 gai_strerror(ret) ));
1969 return NULL;
1970 }
1971
1972 /*
1973 * Make sure that getaddrinfo() returns the "correct" host name.
1974 */
1975
1976 if (res->ai_canonname == NULL) {
1977 DEBUG(3,("get_mydnsfullname: failed to get "
1978 "canonical name for %s\n",
1979 my_hostname));
1980 freeaddrinfo(res);
1981 return NULL;
1982 }
1983
1984 /* This copies the data, so we must do a lookup
1985 * afterwards to find the value to return.
1986 */
1987
1988 memcache_add(NULL, SINGLETON_CACHE,
1989 data_blob_string_const("get_mydnsfullname"),
1990 data_blob_string_const(res->ai_canonname));
1991
1992 if (!memcache_lookup(NULL, SINGLETON_CACHE,
1993 data_blob_string_const("get_mydnsfullname"),
1994 &tmp)) {
1995 tmp = data_blob_talloc(talloc_tos(), res->ai_canonname,
1996 strlen(res->ai_canonname) + 1);
1997 }
1998
1999 freeaddrinfo(res);
2000
2001 return (const char *)tmp.data;
2002 }
2003
2004 /************************************************************
2005 Is this my name ?
2006 ************************************************************/
2007
2008 bool is_myname_or_ipaddr(const char *s)
2009 {
2010 TALLOC_CTX *ctx = talloc_tos();
2011 char *name = NULL;
2012 const char *dnsname;
2013 char *servername = NULL;
2014
2015 if (!s) {
2016 return false;
2017 }
2018
2019 /* Santize the string from '\\name' */
2020 name = talloc_strdup(ctx, s);
2021 if (!name) {
2022 return false;
2023 }
2024
2025 servername = strrchr_m(name, '\\' );
2026 if (!servername) {
2027 servername = name;
2028 } else {
2029 servername++;
2030 }
2031
2032 /* Optimize for the common case */
2033 if (strequal(servername, global_myname())) {
2034 return true;
2035 }
2036
2037 /* Check for an alias */
2038 if (is_myname(servername)) {
2039 return true;
2040 }
2041
2042 /* Check for loopback */
2043 if (strequal(servername, "127.0.0.1") ||
2044 strequal(servername, "::1")) {
2045 return true;
2046 }
2047
2048 if (strequal(servername, "localhost")) {
2049 return true;
2050 }
2051
2052 /* Maybe it's my dns name */
2053 dnsname = get_mydnsfullname();
2054 if (dnsname && strequal(servername, dnsname)) {
2055 return true;
2056 }
2057
2058 /* Handle possible CNAME records - convert to an IP addr. */
2059 if (!is_ipaddress(servername)) {
2060 /* Use DNS to resolve the name, but only the first address */
2061 struct sockaddr_storage ss;
2062 if (interpret_string_addr(&ss, servername,0)) {
2063 print_sockaddr(name,
2064 sizeof(name),
2065 &ss);
2066 servername = name;
2067 }
2068 }
2069
2070 /* Maybe its an IP address? */
2071 if (is_ipaddress(servername)) {
2072 struct sockaddr_storage ss;
2073 struct iface_struct *nics;
2074 int i, n;
2075
2076 if (!interpret_string_addr(&ss, servername, AI_NUMERICHOST)) {
2077 return false;
2078 }
2079
2080 if (is_zero_addr(&ss) || is_loopback_addr(&ss)) {
2081 return false;
2082 }
2083
2084 nics = TALLOC_ARRAY(ctx, struct iface_struct,
2085 MAX_INTERFACES);
2086 if (!nics) {
2087 return false;
2088 }
2089 n = get_interfaces(nics, MAX_INTERFACES);
2090 for (i=0; i<n; i++) {
2091 if (addr_equal(&nics[i].ip, &ss)) {
2092 TALLOC_FREE(nics);
2093 return true;
2094 }
2095 }
2096 TALLOC_FREE(nics);
2097 }
2098
2099 /* No match */
2100 return false;
2101 }
reg import