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r3265: fix lmhosts lookup so that we don't say we found something when we really...
[Samba.git] / source / libsmb / namequery.c
blobcdbc7f758a82a43bc247cbe1d6eed5302817bfb6
1 /*
2 Unix SMB/CIFS implementation.
3 name query routines
4 Copyright (C) Andrew Tridgell 1994-1998
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19
20 */
21
22 #include "includes.h"
23
24 /* nmbd.c sets this to True. */
25 BOOL global_in_nmbd = False;
26
27 /****************************************************************************
28 Generate a random trn_id.
29 ****************************************************************************/
30
31 static int generate_trn_id(void)
32 {
33 static int trn_id;
34
35 if (trn_id == 0) {
36 sys_srandom(sys_getpid());
37 }
38
39 trn_id = sys_random();
40
41 return trn_id % (unsigned)0x7FFF;
42 }
43
44 /****************************************************************************
45 Parse a node status response into an array of structures.
46 ****************************************************************************/
47
48 static struct node_status *parse_node_status(char *p, int *num_names, struct node_status_extra *extra)
49 {
50 struct node_status *ret;
51 int i;
52
53 *num_names = CVAL(p,0);
54
55 if (*num_names == 0)
56 return NULL;
57
58 ret = (struct node_status *)malloc(sizeof(struct node_status)* (*num_names));
59 if (!ret)
60 return NULL;
61
62 p++;
63 for (i=0;i< *num_names;i++) {
64 StrnCpy(ret[i].name,p,15);
65 trim_char(ret[i].name,'\0',' ');
66 ret[i].type = CVAL(p,15);
67 ret[i].flags = p[16];
68 p += 18;
69 DEBUG(10, ("%s#%02x: flags = 0x%02x\n", ret[i].name,
70 ret[i].type, ret[i].flags));
71 }
72 /*
73 * Also, pick up the MAC address ...
74 */
75 if (extra) {
76 memcpy(&extra->mac_addr, p, 6); /* Fill in the mac addr */
77 }
78 return ret;
79 }
80
81
82 /****************************************************************************
83 Do a NBT node status query on an open socket and return an array of
84 structures holding the returned names or NULL if the query failed.
85 **************************************************************************/
86
87 struct node_status *node_status_query(int fd,struct nmb_name *name,
88 struct in_addr to_ip, int *num_names,
89 struct node_status_extra *extra)
90 {
91 BOOL found=False;
92 int retries = 2;
93 int retry_time = 2000;
94 struct timeval tval;
95 struct packet_struct p;
96 struct packet_struct *p2;
97 struct nmb_packet *nmb = &p.packet.nmb;
98 struct node_status *ret;
99
100 ZERO_STRUCT(p);
101
102 nmb->header.name_trn_id = generate_trn_id();
103 nmb->header.opcode = 0;
104 nmb->header.response = False;
105 nmb->header.nm_flags.bcast = False;
106 nmb->header.nm_flags.recursion_available = False;
107 nmb->header.nm_flags.recursion_desired = False;
108 nmb->header.nm_flags.trunc = False;
109 nmb->header.nm_flags.authoritative = False;
110 nmb->header.rcode = 0;
111 nmb->header.qdcount = 1;
112 nmb->header.ancount = 0;
113 nmb->header.nscount = 0;
114 nmb->header.arcount = 0;
115 nmb->question.question_name = *name;
116 nmb->question.question_type = 0x21;
117 nmb->question.question_class = 0x1;
118
119 p.ip = to_ip;
120 p.port = NMB_PORT;
121 p.fd = fd;
122 p.timestamp = time(NULL);
123 p.packet_type = NMB_PACKET;
124
125 GetTimeOfDay(&tval);
126
127 if (!send_packet(&p))
128 return NULL;
129
130 retries--;
131
132 while (1) {
133 struct timeval tval2;
134 GetTimeOfDay(&tval2);
135 if (TvalDiff(&tval,&tval2) > retry_time) {
136 if (!retries)
137 break;
138 if (!found && !send_packet(&p))
139 return NULL;
140 GetTimeOfDay(&tval);
141 retries--;
142 }
143
144 if ((p2=receive_nmb_packet(fd,90,nmb->header.name_trn_id))) {
145 struct nmb_packet *nmb2 = &p2->packet.nmb;
146 debug_nmb_packet(p2);
147
148 if (nmb2->header.opcode != 0 ||
149 nmb2->header.nm_flags.bcast ||
150 nmb2->header.rcode ||
151 !nmb2->header.ancount ||
152 nmb2->answers->rr_type != 0x21) {
153 /* XXXX what do we do with this? could be a
154 redirect, but we'll discard it for the
155 moment */
156 free_packet(p2);
157 continue;
158 }
159
160 ret = parse_node_status(&nmb2->answers->rdata[0], num_names, extra);
161 free_packet(p2);
162 return ret;
163 }
164 }
165
166 return NULL;
167 }
168
169 /****************************************************************************
170 Find the first type XX name in a node status reply - used for finding
171 a servers name given its IP. Return the matched name in *name.
172 **************************************************************************/
173
174 BOOL name_status_find(const char *q_name, int q_type, int type, struct in_addr to_ip, fstring name)
175 {
176 struct node_status *status = NULL;
177 struct nmb_name nname;
178 int count, i;
179 int sock;
180 BOOL result = False;
181
182 if (lp_disable_netbios()) {
183 DEBUG(5,("name_status_find(%s#%02x): netbios is disabled\n", q_name, q_type));
184 return False;
185 }
186
187 DEBUG(10, ("name_status_find: looking up %s#%02x at %s\n", q_name,
188 q_type, inet_ntoa(to_ip)));
189
190 /* Check the cache first. */
191
192 if (namecache_status_fetch(q_name, q_type, type, to_ip, name))
193 return True;
194
195 sock = open_socket_in(SOCK_DGRAM, 0, 3, interpret_addr(lp_socket_address()), True);
196 if (sock == -1)
197 goto done;
198
199 /* W2K PDC's seem not to respond to '*'#0. JRA */
200 make_nmb_name(&nname, q_name, q_type);
201 status = node_status_query(sock, &nname, to_ip, &count, NULL);
202 close(sock);
203 if (!status)
204 goto done;
205
206 for (i=0;i<count;i++) {
207 if (status[i].type == type)
208 break;
209 }
210 if (i == count)
211 goto done;
212
213 pull_ascii_nstring(name, sizeof(fstring), status[i].name);
214
215 /* Store the result in the cache. */
216 /* but don't store an entry for 0x1c names here. Here we have
217 a single host and DOMAIN<0x1c> names should be a list of hosts */
218
219 if ( q_type != 0x1c )
220 namecache_status_store(q_name, q_type, type, to_ip, name);
221
222 result = True;
223
224 done:
225 SAFE_FREE(status);
226
227 DEBUG(10, ("name_status_find: name %sfound", result ? "" : "not "));
228
229 if (result)
230 DEBUGADD(10, (", name %s ip address is %s", name, inet_ntoa(to_ip)));
231
232 DEBUG(10, ("\n"));
233
234 return result;
235 }
236
237 /*
238 comparison function used by sort_ip_list
239 */
240
241 static int ip_compare(struct in_addr *ip1, struct in_addr *ip2)
242 {
243 int max_bits1=0, max_bits2=0;
244 int num_interfaces = iface_count();
245 int i;
246
247 for (i=0;i<num_interfaces;i++) {
248 struct in_addr ip;
249 int bits1, bits2;
250 ip = *iface_n_bcast(i);
251 bits1 = matching_quad_bits((uchar *)&ip1->s_addr, (uchar *)&ip.s_addr);
252 bits2 = matching_quad_bits((uchar *)&ip2->s_addr, (uchar *)&ip.s_addr);
253 max_bits1 = MAX(bits1, max_bits1);
254 max_bits2 = MAX(bits2, max_bits2);
255 }
256
257 /* bias towards directly reachable IPs */
258 if (iface_local(*ip1)) {
259 max_bits1 += 32;
260 }
261 if (iface_local(*ip2)) {
262 max_bits2 += 32;
263 }
264
265 return max_bits2 - max_bits1;
266 }
267
268 /*******************************************************************
269 compare 2 ldap IPs by nearness to our interfaces - used in qsort
270 *******************************************************************/
271
272 static int ip_service_compare(struct ip_service *ip1, struct ip_service *ip2)
273 {
274 int result;
275
276 if ( (result = ip_compare(&ip1->ip, &ip2->ip)) != 0 )
277 return result;
278
279 if ( ip1->port > ip2->port )
280 return 1;
281
282 if ( ip1->port < ip2->port )
283 return -1;
284
285 return 0;
286 }
287
288 /*
289 sort an IP list so that names that are close to one of our interfaces
290 are at the top. This prevents the problem where a WINS server returns an IP that
291 is not reachable from our subnet as the first match
292 */
293
294 static void sort_ip_list(struct in_addr *iplist, int count)
295 {
296 if (count <= 1) {
297 return;
298 }
299
300 qsort(iplist, count, sizeof(struct in_addr), QSORT_CAST ip_compare);
301 }
302
303 static void sort_ip_list2(struct ip_service *iplist, int count)
304 {
305 if (count <= 1) {
306 return;
307 }
308
309 qsort(iplist, count, sizeof(struct ip_service), QSORT_CAST ip_service_compare);
310 }
311
312 /**********************************************************************
313 Remove any duplicate address/port pairs in the list
314 *********************************************************************/
315
316 static int remove_duplicate_addrs2( struct ip_service *iplist, int count )
317 {
318 int i, j;
319
320 DEBUG(10,("remove_duplicate_addrs2: looking for duplicate address/port pairs\n"));
321
322 /* one loop to remove duplicates */
323 for ( i=0; i<count; i++ ) {
324 if ( is_zero_ip(iplist[i].ip) )
325 continue;
326
327 for ( j=i+1; j<count; j++ ) {
328 if ( ip_service_equal(iplist[i], iplist[j]) )
329 zero_ip(&iplist[j].ip);
330 }
331 }
332
333 /* one loop to clean up any holes we left */
334 /* first ip should never be a zero_ip() */
335 for (i = 0; i<count; ) {
336 if ( is_zero_ip(iplist[i].ip) ) {
337 if (i != count-1 )
338 memmove(&iplist[i], &iplist[i+1], (count - i - 1)*sizeof(iplist[i]));
339 count--;
340 continue;
341 }
342 i++;
343 }
344
345 return count;
346 }
347
348 /****************************************************************************
349 Do a netbios name query to find someones IP.
350 Returns an array of IP addresses or NULL if none.
351 *count will be set to the number of addresses returned.
352 *timed_out is set if we failed by timing out
353 ****************************************************************************/
354
355 struct in_addr *name_query(int fd,const char *name,int name_type,
356 BOOL bcast,BOOL recurse,
357 struct in_addr to_ip, int *count, int *flags,
358 BOOL *timed_out)
359 {
360 BOOL found=False;
361 int i, retries = 3;
362 int retry_time = bcast?250:2000;
363 struct timeval tval;
364 struct packet_struct p;
365 struct packet_struct *p2;
366 struct nmb_packet *nmb = &p.packet.nmb;
367 struct in_addr *ip_list = NULL;
368
369 if (lp_disable_netbios()) {
370 DEBUG(5,("name_query(%s#%02x): netbios is disabled\n", name, name_type));
371 return NULL;
372 }
373
374 if (timed_out) {
375 *timed_out = False;
376 }
377
378 memset((char *)&p,'\0',sizeof(p));
379 (*count) = 0;
380 (*flags) = 0;
381
382 nmb->header.name_trn_id = generate_trn_id();
383 nmb->header.opcode = 0;
384 nmb->header.response = False;
385 nmb->header.nm_flags.bcast = bcast;
386 nmb->header.nm_flags.recursion_available = False;
387 nmb->header.nm_flags.recursion_desired = recurse;
388 nmb->header.nm_flags.trunc = False;
389 nmb->header.nm_flags.authoritative = False;
390 nmb->header.rcode = 0;
391 nmb->header.qdcount = 1;
392 nmb->header.ancount = 0;
393 nmb->header.nscount = 0;
394 nmb->header.arcount = 0;
395
396 make_nmb_name(&nmb->question.question_name,name,name_type);
397
398 nmb->question.question_type = 0x20;
399 nmb->question.question_class = 0x1;
400
401 p.ip = to_ip;
402 p.port = NMB_PORT;
403 p.fd = fd;
404 p.timestamp = time(NULL);
405 p.packet_type = NMB_PACKET;
406
407 GetTimeOfDay(&tval);
408
409 if (!send_packet(&p))
410 return NULL;
411
412 retries--;
413
414 while (1) {
415 struct timeval tval2;
416 struct in_addr *tmp_ip_list;
417
418 GetTimeOfDay(&tval2);
419 if (TvalDiff(&tval,&tval2) > retry_time) {
420 if (!retries)
421 break;
422 if (!found && !send_packet(&p))
423 return NULL;
424 GetTimeOfDay(&tval);
425 retries--;
426 }
427
428 if ((p2=receive_nmb_packet(fd,90,nmb->header.name_trn_id))) {
429 struct nmb_packet *nmb2 = &p2->packet.nmb;
430 debug_nmb_packet(p2);
431
432 /* If we get a Negative Name Query Response from a WINS
433 * server, we should report it and give up.
434 */
435 if( 0 == nmb2->header.opcode /* A query response */
436 && !(bcast) /* from a WINS server */
437 && nmb2->header.rcode /* Error returned */
438 ) {
439
440 if( DEBUGLVL( 3 ) ) {
441 /* Only executed if DEBUGLEVEL >= 3 */
442 dbgtext( "Negative name query response, rcode 0x%02x: ", nmb2->header.rcode );
443 switch( nmb2->header.rcode ) {
444 case 0x01:
445 dbgtext( "Request was invalidly formatted.\n" );
446 break;
447 case 0x02:
448 dbgtext( "Problem with NBNS, cannot process name.\n");
449 break;
450 case 0x03:
451 dbgtext( "The name requested does not exist.\n" );
452 break;
453 case 0x04:
454 dbgtext( "Unsupported request error.\n" );
455 break;
456 case 0x05:
457 dbgtext( "Query refused error.\n" );
458 break;
459 default:
460 dbgtext( "Unrecognized error code.\n" );
461 break;
462 }
463 }
464 free_packet(p2);
465 return( NULL );
466 }
467
468 if (nmb2->header.opcode != 0 ||
469 nmb2->header.nm_flags.bcast ||
470 nmb2->header.rcode ||
471 !nmb2->header.ancount) {
472 /*
473 * XXXX what do we do with this? Could be a
474 * redirect, but we'll discard it for the
475 * moment.
476 */
477 free_packet(p2);
478 continue;
479 }
480
481 tmp_ip_list = (struct in_addr *)Realloc( ip_list, sizeof( ip_list[0] )
482 * ( (*count) + nmb2->answers->rdlength/6 ) );
483
484 if (!tmp_ip_list) {
485 DEBUG(0,("name_query: Realloc failed.\n"));
486 SAFE_FREE(ip_list);
487 }
488
489 ip_list = tmp_ip_list;
490
491 if (ip_list) {
492 DEBUG(2,("Got a positive name query response from %s ( ", inet_ntoa(p2->ip)));
493 for (i=0;i<nmb2->answers->rdlength/6;i++) {
494 putip((char *)&ip_list[(*count)],&nmb2->answers->rdata[2+i*6]);
495 DEBUGADD(2,("%s ",inet_ntoa(ip_list[(*count)])));
496 (*count)++;
497 }
498 DEBUGADD(2,(")\n"));
499 }
500
501 found=True;
502 retries=0;
503 /* We add the flags back ... */
504 if (nmb2->header.response)
505 (*flags) |= NM_FLAGS_RS;
506 if (nmb2->header.nm_flags.authoritative)
507 (*flags) |= NM_FLAGS_AA;
508 if (nmb2->header.nm_flags.trunc)
509 (*flags) |= NM_FLAGS_TC;
510 if (nmb2->header.nm_flags.recursion_desired)
511 (*flags) |= NM_FLAGS_RD;
512 if (nmb2->header.nm_flags.recursion_available)
513 (*flags) |= NM_FLAGS_RA;
514 if (nmb2->header.nm_flags.bcast)
515 (*flags) |= NM_FLAGS_B;
516 free_packet(p2);
517 /*
518 * If we're doing a unicast lookup we only
519 * expect one reply. Don't wait the full 2
520 * seconds if we got one. JRA.
521 */
522 if(!bcast && found)
523 break;
524 }
525 }
526
527 /* only set timed_out if we didn't fund what we where looking for*/
528
529 if ( !found && timed_out ) {
530 *timed_out = True;
531 }
532
533 /* sort the ip list so we choose close servers first if possible */
534 sort_ip_list(ip_list, *count);
535
536 return ip_list;
537 }
538
539 /********************************************************
540 Start parsing the lmhosts file.
541 *********************************************************/
542
543 XFILE *startlmhosts(char *fname)
544 {
545 XFILE *fp = x_fopen(fname,O_RDONLY, 0);
546 if (!fp) {
547 DEBUG(4,("startlmhosts: Can't open lmhosts file %s. Error was %s\n",
548 fname, strerror(errno)));
549 return NULL;
550 }
551 return fp;
552 }
553
554 /********************************************************
555 Parse the next line in the lmhosts file.
556 *********************************************************/
557
558 BOOL getlmhostsent( XFILE *fp, pstring name, int *name_type, struct in_addr *ipaddr)
559 {
560 pstring line;
561
562 while(!x_feof(fp) && !x_ferror(fp)) {
563 pstring ip,flags,extra;
564 const char *ptr;
565 char *ptr1;
566 int count = 0;
567
568 *name_type = -1;
569
570 if (!fgets_slash(line,sizeof(pstring),fp)) {
571 continue;
572 }
573
574 if (*line == '#') {
575 continue;
576 }
577
578 pstrcpy(ip,"");
579 pstrcpy(name,"");
580 pstrcpy(flags,"");
581
582 ptr = line;
583
584 if (next_token(&ptr,ip ,NULL,sizeof(ip)))
585 ++count;
586 if (next_token(&ptr,name ,NULL, sizeof(pstring)))
587 ++count;
588 if (next_token(&ptr,flags,NULL, sizeof(flags)))
589 ++count;
590 if (next_token(&ptr,extra,NULL, sizeof(extra)))
591 ++count;
592
593 if (count <= 0)
594 continue;
595
596 if (count > 0 && count < 2) {
597 DEBUG(0,("getlmhostsent: Ill formed hosts line [%s]\n",line));
598 continue;
599 }
600
601 if (count >= 4) {
602 DEBUG(0,("getlmhostsent: too many columns in lmhosts file (obsolete syntax)\n"));
603 continue;
604 }
605
606 DEBUG(4, ("getlmhostsent: lmhost entry: %s %s %s\n", ip, name, flags));
607
608 if (strchr_m(flags,'G') || strchr_m(flags,'S')) {
609 DEBUG(0,("getlmhostsent: group flag in lmhosts ignored (obsolete)\n"));
610 continue;
611 }
612
613 *ipaddr = *interpret_addr2(ip);
614
615 /* Extra feature. If the name ends in '#XX', where XX is a hex number,
616 then only add that name type. */
617 if((ptr1 = strchr_m(name, '#')) != NULL) {
618 char *endptr;
619 ptr1++;
620
621 *name_type = (int)strtol(ptr1, &endptr, 16);
622 if(!*ptr1 || (endptr == ptr1)) {
623 DEBUG(0,("getlmhostsent: invalid name %s containing '#'.\n", name));
624 continue;
625 }
626
627 *(--ptr1) = '\0'; /* Truncate at the '#' */
628 }
629
630 return True;
631 }
632
633 return False;
634 }
635
636 /********************************************************
637 Finish parsing the lmhosts file.
638 *********************************************************/
639
640 void endlmhosts(XFILE *fp)
641 {
642 x_fclose(fp);
643 }
644
645 /********************************************************
646 convert an array if struct in_addrs to struct ip_service
647 return False on failure. Port is set to PORT_NONE;
648 *********************************************************/
649
650 static BOOL convert_ip2service( struct ip_service **return_iplist, struct in_addr *ip_list, int count )
651 {
652 int i;
653
654 if ( count==0 || !ip_list )
655 return False;
656
657 /* copy the ip address; port will be PORT_NONE */
658 if ( (*return_iplist = (struct ip_service*)malloc(count*sizeof(struct ip_service))) == NULL ) {
659 DEBUG(0,("convert_ip2service: malloc failed for %d enetries!\n", count ));
660 return False;
661 }
662
663 for ( i=0; i<count; i++ ) {
664 (*return_iplist)[i].ip = ip_list[i];
665 (*return_iplist)[i].port = PORT_NONE;
666 }
667
668 return True;
669 }
670 /********************************************************
671 Resolve via "bcast" method.
672 *********************************************************/
673
674 BOOL name_resolve_bcast(const char *name, int name_type,
675 struct ip_service **return_iplist, int *return_count)
676 {
677 int sock, i;
678 int num_interfaces = iface_count();
679 struct in_addr *ip_list;
680 BOOL ret;
681
682 if (lp_disable_netbios()) {
683 DEBUG(5,("name_resolve_bcast(%s#%02x): netbios is disabled\n", name, name_type));
684 return False;
685 }
686
687 *return_iplist = NULL;
688 *return_count = 0;
689
690 /*
691 * "bcast" means do a broadcast lookup on all the local interfaces.
692 */
693
694 DEBUG(3,("name_resolve_bcast: Attempting broadcast lookup for name %s<0x%x>\n", name, name_type));
695
696 sock = open_socket_in( SOCK_DGRAM, 0, 3,
697 interpret_addr(lp_socket_address()), True );
698
699 if (sock == -1) return False;
700
701 set_socket_options(sock,"SO_BROADCAST");
702 /*
703 * Lookup the name on all the interfaces, return on
704 * the first successful match.
705 */
706 for( i = num_interfaces-1; i >= 0; i--) {
707 struct in_addr sendto_ip;
708 int flags;
709 /* Done this way to fix compiler error on IRIX 5.x */
710 sendto_ip = *iface_n_bcast(i);
711 ip_list = name_query(sock, name, name_type, True,
712 True, sendto_ip, return_count, &flags, NULL);
713 if( ip_list )
714 goto success;
715 }
716
717 /* failed - no response */
718
719 close(sock);
720 return False;
721
722 success:
723 ret = True;
724 if ( !convert_ip2service(return_iplist, ip_list, *return_count) )
725 ret = False;
726
727 SAFE_FREE( ip_list );
728 close(sock);
729 return ret;
730 }
731
732 /********************************************************
733 Resolve via "wins" method.
734 *********************************************************/
735
736 BOOL resolve_wins(const char *name, int name_type,
737 struct ip_service **return_iplist, int *return_count)
738 {
739 int sock, t, i;
740 char **wins_tags;
741 struct in_addr src_ip, *ip_list = NULL;
742 BOOL ret;
743
744 if (lp_disable_netbios()) {
745 DEBUG(5,("resolve_wins(%s#%02x): netbios is disabled\n", name, name_type));
746 return False;
747 }
748
749 *return_iplist = NULL;
750 *return_count = 0;
751
752 DEBUG(3,("resolve_wins: Attempting wins lookup for name %s<0x%x>\n", name, name_type));
753
754 if (wins_srv_count() < 1) {
755 DEBUG(3,("resolve_wins: WINS server resolution selected and no WINS servers listed.\n"));
756 return False;
757 }
758
759 /* we try a lookup on each of the WINS tags in turn */
760 wins_tags = wins_srv_tags();
761
762 if (!wins_tags) {
763 /* huh? no tags?? give up in disgust */
764 return False;
765 }
766
767 /* the address we will be sending from */
768 src_ip = *interpret_addr2(lp_socket_address());
769
770 /* in the worst case we will try every wins server with every
771 tag! */
772 for (t=0; wins_tags && wins_tags[t]; t++) {
773 int srv_count = wins_srv_count_tag(wins_tags[t]);
774 for (i=0; i<srv_count; i++) {
775 struct in_addr wins_ip;
776 int flags;
777 BOOL timed_out;
778
779 wins_ip = wins_srv_ip_tag(wins_tags[t], src_ip);
780
781 if (global_in_nmbd && ismyip(wins_ip)) {
782 /* yikes! we'll loop forever */
783 continue;
784 }
785
786 /* skip any that have been unresponsive lately */
787 if (wins_srv_is_dead(wins_ip, src_ip)) {
788 continue;
789 }
790
791 DEBUG(3,("resolve_wins: using WINS server %s and tag '%s'\n", inet_ntoa(wins_ip), wins_tags[t]));
792
793 sock = open_socket_in(SOCK_DGRAM, 0, 3, src_ip.s_addr, True);
794 if (sock == -1) {
795 continue;
796 }
797
798 ip_list = name_query(sock,name,name_type, False,
799 True, wins_ip, return_count, &flags,
800 &timed_out);
801
802 /* exit loop if we got a list of addresses */
803
804 if ( ip_list )
805 goto success;
806
807 close(sock);
808
809 if (timed_out) {
810 /* Timed out wating for WINS server to respond. Mark it dead. */
811 wins_srv_died(wins_ip, src_ip);
812 } else {
813 /* The name definately isn't in this
814 group of WINS servers. goto the next group */
815 break;
816 }
817 }
818 }
819
820 wins_srv_tags_free(wins_tags);
821 return False;
822
823 success:
824 ret = True;
825 if ( !convert_ip2service( return_iplist, ip_list, *return_count ) )
826 ret = False;
827
828 SAFE_FREE( ip_list );
829 wins_srv_tags_free(wins_tags);
830 close(sock);
831
832 return ret;
833 }
834
835 /********************************************************
836 Resolve via "lmhosts" method.
837 *********************************************************/
838
839 static BOOL resolve_lmhosts(const char *name, int name_type,
840 struct ip_service **return_iplist, int *return_count)
841 {
842 /*
843 * "lmhosts" means parse the local lmhosts file.
844 */
845
846 XFILE *fp;
847 pstring lmhost_name;
848 int name_type2;
849 struct in_addr return_ip;
850 BOOL result = False;
851
852 *return_iplist = NULL;
853 *return_count = 0;
854
855 DEBUG(3,("resolve_lmhosts: Attempting lmhosts lookup for name %s<0x%x>\n", name, name_type));
856
857 fp = startlmhosts(dyn_LMHOSTSFILE);
858
859 if ( fp == NULL )
860 return False;
861
862 while (getlmhostsent(fp, lmhost_name, &name_type2, &return_ip))
863 {
864
865 if (!strequal(name, lmhost_name))
866 continue;
867
868 if ((name_type2 != -1) && (name_type != name_type2))
869 continue;
870
871 *return_iplist = (struct ip_service *)realloc((*return_iplist),
872 sizeof(struct ip_service) * ((*return_count)+1));
873
874 if ((*return_iplist) == NULL) {
875 DEBUG(3,("resolve_lmhosts: malloc fail !\n"));
876 return False;
877 }
878
879 (*return_iplist)[*return_count].ip = return_ip;
880 (*return_iplist)[*return_count].port = PORT_NONE;
881 *return_count += 1;
882
883 /* we found something */
884 result = True;
885
886 /* Multiple names only for DC lookup */
887 if (name_type != 0x1c)
888 break;
889 }
890
891 endlmhosts(fp);
892
893 return result;
894 }
895
896
897 /********************************************************
898 Resolve via "hosts" method.
899 *********************************************************/
900
901 static BOOL resolve_hosts(const char *name, int name_type,
902 struct ip_service **return_iplist, int *return_count)
903 {
904 /*
905 * "host" means do a localhost, or dns lookup.
906 */
907 struct hostent *hp;
908
909 if ( name_type != 0x20 && name_type != 0x0) {
910 DEBUG(5, ("resolve_hosts: not appropriate for name type <0x%x>\n", name_type));
911 return False;
912 }
913
914 *return_iplist = NULL;
915 *return_count = 0;
916
917 DEBUG(3,("resolve_hosts: Attempting host lookup for name %s<0x%x>\n", name, name_type));
918
919 if (((hp = sys_gethostbyname(name)) != NULL) && (hp->h_addr != NULL)) {
920 struct in_addr return_ip;
921 putip((char *)&return_ip,(char *)hp->h_addr);
922 *return_iplist = (struct ip_service *)malloc(sizeof(struct ip_service));
923 if(*return_iplist == NULL) {
924 DEBUG(3,("resolve_hosts: malloc fail !\n"));
925 return False;
926 }
927 (*return_iplist)->ip = return_ip;
928 (*return_iplist)->port = PORT_NONE;
929 *return_count = 1;
930 return True;
931 }
932 return False;
933 }
934
935 /********************************************************
936 Resolve via "ADS" method.
937 *********************************************************/
938
939 static BOOL resolve_ads(const char *name, int name_type,
940 struct ip_service **return_iplist, int *return_count)
941 {
942
943 #ifdef HAVE_ADS
944 if ( name_type == 0x1c ) {
945 int count, i = 0;
946 char *list = NULL;
947 const char *ptr;
948 pstring tok;
949
950 /* try to lookup the _ldap._tcp.<domain> if we are using ADS */
951 if ( lp_security() != SEC_ADS )
952 return False;
953
954 DEBUG(5,("resolve_hosts: Attempting to resolve DC's for %s using DNS\n",
955 name));
956
957 if (ldap_domain2hostlist(name, &list) != LDAP_SUCCESS)
958 return False;
959
960 count = count_chars(list, ' ') + 1;
961 if ( (*return_iplist = malloc(count * sizeof(struct ip_service))) == NULL ) {
962 DEBUG(0,("resolve_hosts: malloc failed for %d entries\n", count ));
963 return False;
964 }
965
966 ptr = list;
967 while (next_token(&ptr, tok, " ", sizeof(tok))) {
968 unsigned port = LDAP_PORT;
969 char *p = strchr(tok, ':');
970 if (p) {
971 *p = 0;
972 port = atoi(p+1);
973 }
974 (*return_iplist)[i].ip = *interpret_addr2(tok);
975 (*return_iplist)[i].port = port;
976
977 /* make sure it is a valid IP. I considered checking the negative
978 connection cache, but this is the wrong place for it. Maybe only
979 as a hac. After think about it, if all of the IP addresses retuend
980 from DNS are dead, what hope does a netbios name lookup have?
981 The standard reason for falling back to netbios lookups is that
982 our DNS server doesn't know anything about the DC's -- jerry */
983
984 if ( is_zero_ip((*return_iplist)[i].ip) )
985 continue;
986
987 i++;
988 }
989 SAFE_FREE(list);
990
991 *return_count = i;
992
993 return True;
994 } else
995 #endif /* HAVE_ADS */
996 {
997 return False;
998 }
999 }
1000
1001 /*******************************************************************
1002 Internal interface to resolve a name into an IP address.
1003 Use this function if the string is either an IP address, DNS
1004 or host name or NetBIOS name. This uses the name switch in the
1005 smb.conf to determine the order of name resolution.
1006
1007 Added support for ip addr/port to support ADS ldap servers.
1008 the only place we currently care about the port is in the
1009 resolve_hosts() when looking up DC's via SRV RR entries in DNS
1010 **********************************************************************/
1011
1012 static BOOL internal_resolve_name(const char *name, int name_type,
1013 struct ip_service **return_iplist,
1014 int *return_count, const char *resolve_order)
1015 {
1016 pstring name_resolve_list;
1017 fstring tok;
1018 const char *ptr;
1019 BOOL allones = (strcmp(name,"255.255.255.255") == 0);
1020 BOOL allzeros = (strcmp(name,"0.0.0.0") == 0);
1021 BOOL is_address = is_ipaddress(name);
1022 BOOL result = False;
1023 int i;
1024
1025 *return_iplist = NULL;
1026 *return_count = 0;
1027
1028 DEBUG(10, ("internal_resolve_name: looking up %s#%x\n", name, name_type));
1029
1030 if (allzeros || allones || is_address) {
1031
1032 if ( (*return_iplist = (struct ip_service *)malloc(sizeof(struct ip_service))) == NULL ) {
1033 DEBUG(0,("internal_resolve_name: malloc fail !\n"));
1034 return False;
1035 }
1036
1037 if(is_address) {
1038 /* ignore the port here */
1039 (*return_iplist)->port = PORT_NONE;
1040
1041 /* if it's in the form of an IP address then get the lib to interpret it */
1042 if (((*return_iplist)->ip.s_addr = inet_addr(name)) == 0xFFFFFFFF ){
1043 DEBUG(1,("internal_resolve_name: inet_addr failed on %s\n", name));
1044 return False;
1045 }
1046 } else {
1047 (*return_iplist)->ip.s_addr = allones ? 0xFFFFFFFF : 0;
1048 }
1049 *return_count = 1;
1050 return True;
1051 }
1052
1053 /* Check name cache */
1054
1055 if (namecache_fetch(name, name_type, return_iplist, return_count)) {
1056 /* This could be a negative response */
1057 return (*return_count > 0);
1058 }
1059
1060 /* set the name resolution order */
1061
1062 if ( strcmp( resolve_order, "NULL") == 0 ) {
1063 DEBUG(8,("internal_resolve_name: all lookups disabled\n"));
1064 return False;
1065 }
1066
1067 if ( !resolve_order ) {
1068 pstrcpy(name_resolve_list, lp_name_resolve_order());
1069 } else {
1070 pstrcpy(name_resolve_list, resolve_order);
1071
1072 if ( !name_resolve_list[0] ) {
1073 ptr = "host";
1074 } else {
1075 ptr = name_resolve_list;
1076 }
1077
1078 /* iterate through the name resolution backends */
1079
1080 while (next_token(&ptr, tok, LIST_SEP, sizeof(tok))) {
1081 if((strequal(tok, "host") || strequal(tok, "hosts"))) {
1082 if (resolve_hosts(name, name_type, return_iplist, return_count)) {
1083 result = True;
1084 goto done;
1085 }
1086 } else if(strequal( tok, "ads")) {
1087 /* deal with 0x1c names here. This will result in a
1088 SRV record lookup for _ldap._tcp.<domain> if we
1089 are using 'security = ads' */
1090 if (resolve_ads(name, name_type, return_iplist, return_count)) {
1091 result = True;
1092 goto done;
1093 }
1094 } else if(strequal( tok, "lmhosts")) {
1095 if (resolve_lmhosts(name, name_type, return_iplist, return_count)) {
1096 result = True;
1097 goto done;
1098 }
1099 } else if(strequal( tok, "wins")) {
1100 /* don't resolve 1D via WINS */
1101 if (name_type != 0x1D && resolve_wins(name, name_type, return_iplist, return_count)) {
1102 result = True;
1103 goto done;
1104 }
1105 } else if(strequal( tok, "bcast")) {
1106 if (name_resolve_bcast(name, name_type, return_iplist, return_count)) {
1107 result = True;
1108 goto done;
1109 }
1110 } else {
1111 DEBUG(0,("resolve_name: unknown name switch type %s\n", tok));
1112 }
1113 }
1114
1115 /* All of the resolve_* functions above have returned false. */
1116
1117 SAFE_FREE(*return_iplist);
1118 *return_count = 0;
1119
1120 return False;
1121
1122 done:
1123
1124 /* Remove duplicate entries. Some queries, notably #1c (domain
1125 controllers) return the PDC in iplist[0] and then all domain
1126 controllers including the PDC in iplist[1..n]. Iterating over
1127 the iplist when the PDC is down will cause two sets of timeouts. */
1128
1129 if ( *return_count ) {
1130 *return_count = remove_duplicate_addrs2( *return_iplist, *return_count );
1131 }
1132
1133 /* Save in name cache */
1134 if ( DEBUGLEVEL >= 100 ) {
1135 for (i = 0; i < *return_count && DEBUGLEVEL == 100; i++)
1136 DEBUG(100, ("Storing name %s of type %d (%s:%d)\n", name,
1137 name_type, inet_ntoa((*return_iplist)[i].ip), (*return_iplist)[i].port));
1138 }
1139
1140 namecache_store(name, name_type, *return_count, *return_iplist);
1141
1142 /* Display some debugging info */
1143
1144 if ( DEBUGLEVEL >= 10 ) {
1145 DEBUG(10, ("internal_resolve_name: returning %d addresses: ", *return_count));
1146
1147 for (i = 0; i < *return_count; i++) {
1148 DEBUGADD(10, ("%s:%d ", inet_ntoa((*return_iplist)[i].ip), (*return_iplist)[i].port));
1149 }
1150 DEBUG(10, ("\n"));
1151 }
1152 }
1153
1154 return result;
1155 }
1156
1157 /********************************************************
1158 Internal interface to resolve a name into one IP address.
1159 Use this function if the string is either an IP address, DNS
1160 or host name or NetBIOS name. This uses the name switch in the
1161 smb.conf to determine the order of name resolution.
1162 *********************************************************/
1163
1164 BOOL resolve_name(const char *name, struct in_addr *return_ip, int name_type)
1165 {
1166 struct ip_service *ip_list = NULL;
1167 int count = 0;
1168
1169 if (is_ipaddress(name)) {
1170 *return_ip = *interpret_addr2(name);
1171 return True;
1172 }
1173
1174 if (internal_resolve_name(name, name_type, &ip_list, &count, lp_name_resolve_order())) {
1175 int i;
1176
1177 /* only return valid addresses for TCP connections */
1178 for (i=0; i<count; i++) {
1179 char *ip_str = inet_ntoa(ip_list[i].ip);
1180 if (ip_str &&
1181 strcmp(ip_str, "255.255.255.255") != 0 &&
1182 strcmp(ip_str, "0.0.0.0") != 0)
1183 {
1184 *return_ip = ip_list[i].ip;
1185 SAFE_FREE(ip_list);
1186 return True;
1187 }
1188 }
1189 }
1190
1191 SAFE_FREE(ip_list);
1192 return False;
1193 }
1194
1195 /********************************************************
1196 Find the IP address of the master browser or DMB for a workgroup.
1197 *********************************************************/
1198
1199 BOOL find_master_ip(const char *group, struct in_addr *master_ip)
1200 {
1201 struct ip_service *ip_list = NULL;
1202 int count = 0;
1203
1204 if (lp_disable_netbios()) {
1205 DEBUG(5,("find_master_ip(%s): netbios is disabled\n", group));
1206 return False;
1207 }
1208
1209 if (internal_resolve_name(group, 0x1D, &ip_list, &count, lp_name_resolve_order())) {
1210 *master_ip = ip_list[0].ip;
1211 SAFE_FREE(ip_list);
1212 return True;
1213 }
1214 if(internal_resolve_name(group, 0x1B, &ip_list, &count, lp_name_resolve_order())) {
1215 *master_ip = ip_list[0].ip;
1216 SAFE_FREE(ip_list);
1217 return True;
1218 }
1219
1220 SAFE_FREE(ip_list);
1221 return False;
1222 }
1223
1224 /********************************************************
1225 Get the IP address list of the primary domain controller
1226 for a domain.
1227 *********************************************************/
1228
1229 BOOL get_pdc_ip(const char *domain, struct in_addr *ip)
1230 {
1231 struct ip_service *ip_list;
1232 int count;
1233
1234 /* Look up #1B name */
1235
1236 if (!internal_resolve_name(domain, 0x1b, &ip_list, &count, lp_name_resolve_order())) {
1237 return False;
1238 }
1239
1240 /* if we get more than 1 IP back we have to assume it is a
1241 multi-homed PDC and not a mess up */
1242
1243 if ( count > 1 ) {
1244 DEBUG(6,("get_pdc_ip: PDC has %d IP addresses!\n", count));
1245 sort_ip_list2( ip_list, count );
1246 }
1247
1248 *ip = ip_list[0].ip;
1249
1250 SAFE_FREE(ip_list);
1251
1252 return True;
1253 }
1254
1255 /********************************************************
1256 Get the IP address list of the domain controllers for
1257 a domain.
1258 *********************************************************/
1259
1260 static BOOL get_dc_list(const char *domain, struct ip_service **ip_list,
1261 int *count, BOOL ads_only, int *ordered)
1262 {
1263 fstring resolve_order;
1264
1265 /* if we are restricted to solely using DNS for looking
1266 up a domain controller, make sure that host lookups
1267 are enabled for the 'name resolve order'. If host lookups
1268 are disabled and ads_only is True, then set the string to
1269 NULL. */
1270
1271 fstrcpy( resolve_order, lp_name_resolve_order() );
1272 strlower_m( resolve_order );
1273 if ( ads_only ) {
1274 if ( strstr( resolve_order, "host" ) )
1275 fstrcpy( resolve_order, "ads" );
1276 else
1277 fstrcpy( resolve_order, "NULL" );
1278 }
1279
1280
1281 *ordered = False;
1282
1283 /* If it's our domain then use the 'password server' parameter. */
1284
1285 if ( strequal(domain, lp_workgroup()) || strequal(domain, lp_realm()) ) {
1286 const char *p;
1287 char *pserver = lp_passwordserver(); /* UNIX charset. */
1288 char *port_str;
1289 int port;
1290 fstring name;
1291 int num_addresses = 0;
1292 int local_count, i, j;
1293 struct ip_service *return_iplist = NULL;
1294 struct ip_service *auto_ip_list = NULL;
1295 BOOL done_auto_lookup = False;
1296 int auto_count = 0;
1297
1298
1299 if (!*pserver)
1300 return internal_resolve_name(domain, 0x1C, ip_list, count, resolve_order);
1301
1302 p = pserver;
1303
1304 /*
1305 * if '*' appears in the "password server" list then add
1306 * an auto lookup to the list of manually configured
1307 * DC's. If any DC is listed by name, then the list should be
1308 * considered to be ordered
1309 */
1310
1311 while (next_token(&p,name,LIST_SEP,sizeof(name))) {
1312 if (strequal(name, "*")) {
1313 if ( internal_resolve_name(domain, 0x1C, &auto_ip_list, &auto_count, resolve_order) )
1314 num_addresses += auto_count;
1315 done_auto_lookup = True;
1316 DEBUG(8,("Adding %d DC's from auto lookup\n", auto_count));
1317 } else {
1318 num_addresses++;
1319 }
1320 }
1321
1322 /* if we have no addresses and haven't done the auto lookup, then
1323 just return the list of DC's */
1324
1325 if ( (num_addresses == 0) && !done_auto_lookup ) {
1326 return internal_resolve_name(domain, 0x1C, ip_list, count, resolve_order);
1327 }
1328
1329 /* maybe we just failed? */
1330
1331 if ( num_addresses == 0 ) {
1332 DEBUG(4,("get_dc_list: no servers found\n"));
1333 return False;
1334 }
1335
1336 if ( (return_iplist = (struct ip_service *)
1337 malloc(num_addresses * sizeof(struct ip_service))) == NULL ) {
1338 DEBUG(3,("get_dc_list: malloc fail !\n"));
1339 return False;
1340 }
1341
1342 p = pserver;
1343 local_count = 0;
1344
1345 /* fill in the return list now with real IP's */
1346
1347 while ( (local_count<num_addresses) && next_token(&p,name,LIST_SEP,sizeof(name)) ) {
1348 struct in_addr name_ip;
1349
1350 /* copy any addersses from the auto lookup */
1351
1352 if ( strequal(name, "*") ) {
1353 for ( j=0; j<auto_count; j++ ) {
1354 /* Check for and don't copy any known bad DC IP's. */
1355 if(!NT_STATUS_IS_OK(check_negative_conn_cache(domain,
1356 inet_ntoa(auto_ip_list[j].ip)))) {
1357 DEBUG(5,("get_dc_list: negative entry %s removed from DC list\n",
1358 inet_ntoa(auto_ip_list[j].ip) ));
1359 continue;
1360 }
1361 return_iplist[local_count].ip = auto_ip_list[j].ip;
1362 return_iplist[local_count].port = auto_ip_list[j].port;
1363 local_count++;
1364 }
1365 continue;
1366 }
1367
1368
1369 /* added support for address:port syntax for ads (not that I think
1370 anyone will ever run the LDAP server in an AD domain on something
1371 other than port 389 */
1372
1373 port = (lp_security() == SEC_ADS) ? LDAP_PORT : PORT_NONE;
1374 if ( (port_str=strchr(name, ':')) != NULL ) {
1375 *port_str = '\0';
1376 port_str++;
1377 port = atoi( port_str );
1378 }
1379
1380 /* explicit lookup; resolve_name() will handle names & IP addresses */
1381 if ( resolve_name( name, &name_ip, 0x20 ) ) {
1382
1383 /* Check for and don't copy any known bad DC IP's. */
1384 if( !NT_STATUS_IS_OK(check_negative_conn_cache(domain, inet_ntoa(name_ip))) ) {
1385 DEBUG(5,("get_dc_list: negative entry %s removed from DC list\n",name ));
1386 continue;
1387 }
1388
1389 return_iplist[local_count].ip = name_ip;
1390 return_iplist[local_count].port = port;
1391 local_count++;
1392 *ordered = True;
1393 }
1394 }
1395
1396 SAFE_FREE(auto_ip_list);
1397
1398 /* need to remove duplicates in the list if we have any
1399 explicit password servers */
1400
1401 if ( local_count ) {
1402 local_count = remove_duplicate_addrs2( return_iplist, local_count );
1403 }
1404
1405 if ( DEBUGLEVEL >= 4 ) {
1406 DEBUG(4,("get_dc_list: returning %d ip addresses in an %sordered list\n", local_count,
1407 *ordered ? "":"un"));
1408 DEBUG(4,("get_dc_list: "));
1409 for ( i=0; i<local_count; i++ )
1410 DEBUGADD(4,("%s:%d ", inet_ntoa(return_iplist[i].ip), return_iplist[i].port ));
1411 DEBUGADD(4,("\n"));
1412 }
1413
1414 *ip_list = return_iplist;
1415 *count = local_count;
1416
1417 return (*count != 0);
1418 }
1419
1420 DEBUG(10,("get_dc_list: defaulting to internal auto lookup for domain %s\n", domain));
1421
1422 return internal_resolve_name(domain, 0x1C, ip_list, count, resolve_order);
1423 }
1424
1425 /*********************************************************************
1426 Small wrapper function to get the DC list and sort it if neccessary.
1427 *********************************************************************/
1428
1429 BOOL get_sorted_dc_list( const char *domain, struct ip_service **ip_list, int *count, BOOL ads_only )
1430 {
1431 BOOL ordered;
1432
1433 DEBUG(8,("get_sorted_dc_list: attempting lookup using [%s]\n",
1434 (ads_only ? "ads" : lp_name_resolve_order())));
1435
1436 if ( !get_dc_list(domain, ip_list, count, ads_only, &ordered) ) {
1437 return False;
1438 }
1439
1440 /* only sort if we don't already have an ordered list */
1441 if ( !ordered ) {
1442 sort_ip_list2( *ip_list, *count );
1443 }
1444
1445 return True;
1446 }
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