source: branches/samba-3.2.x/source/nmbd/nmbd_namelistdb.c@ 536

Last change on this file since 536 was 133, checked in by Paul Smedley, 18 years ago

Update trunk to 3.2.0pre3
File size: 19.6 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 NBT netbios routines and daemon - version 2
4 Copyright (C) Andrew Tridgell 1994-1998
5 Copyright (C) Luke Kenneth Casson Leighton 1994-1998
6 Copyright (C) Jeremy Allison 1994-2003
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
23#include "includes.h"
24
25uint16 samba_nb_type = 0; /* samba's NetBIOS name type */
26
27
28/**************************************************************************
29 Set Samba's NetBIOS name type.
30***************************************************************************/
31
32void set_samba_nb_type(void)
33{
34 if( lp_wins_support() || wins_srv_count() ) {
35 samba_nb_type = NB_HFLAG; /* samba is a 'hybrid' node type. */
36 } else {
37 samba_nb_type = NB_BFLAG; /* samba is broadcast-only node type. */
38 }
39}
40
41/***************************************************************************
42 Convert a NetBIOS name to upper case.
43***************************************************************************/
44
45static void upcase_name( struct nmb_name *target, const struct nmb_name *source )
46{
47 int i;
48 unstring targ;
49 fstring scope;
50
51 if( NULL != source ) {
52 memcpy( target, source, sizeof( struct nmb_name ) );
53 }
54
55 pull_ascii_nstring(targ, sizeof(targ), target->name);
56 strupper_m( targ );
57 push_ascii_nstring( target->name, targ);
58
59 pull_ascii(scope, target->scope, 64, -1, STR_TERMINATE);
60 strupper_m( scope );
61 push_ascii(target->scope, scope, 64, STR_TERMINATE);
62
63 /* fudge... We're using a byte-by-byte compare, so we must be sure that
64 * unused space doesn't have garbage in it.
65 */
66
67 for( i = strlen( target->name ); i < sizeof( target->name ); i++ ) {
68 target->name[i] = '\0';
69 }
70 for( i = strlen( target->scope ); i < sizeof( target->scope ); i++ ) {
71 target->scope[i] = '\0';
72 }
73}
74
75/**************************************************************************
76 Remove a name from the namelist.
77***************************************************************************/
78
79void remove_name_from_namelist(struct subnet_record *subrec,
80 struct name_record *namerec )
81{
82 if (subrec == wins_server_subnet)
83 remove_name_from_wins_namelist(namerec);
84 else {
85 subrec->namelist_changed = True;
86 DLIST_REMOVE(subrec->namelist, namerec);
87 }
88
89 SAFE_FREE(namerec->data.ip);
90 ZERO_STRUCTP(namerec);
91 SAFE_FREE(namerec);
92}
93
94/**************************************************************************
95 Find a name in a subnet.
96**************************************************************************/
97
98struct name_record *find_name_on_subnet(struct subnet_record *subrec,
99 const struct nmb_name *nmbname,
100 bool self_only)
101{
102 struct nmb_name uc_name;
103 struct name_record *name_ret;
104
105 upcase_name( &uc_name, nmbname );
106
107 if (subrec == wins_server_subnet) {
108 return find_name_on_wins_subnet(&uc_name, self_only);
109 }
110
111 for( name_ret = subrec->namelist; name_ret; name_ret = name_ret->next) {
112 if (memcmp(&uc_name, &name_ret->name, sizeof(struct nmb_name)) == 0) {
113 break;
114 }
115 }
116
117 if( name_ret ) {
118 /* Self names only - these include permanent names. */
119 if( self_only && (name_ret->data.source != SELF_NAME) && (name_ret->data.source != PERMANENT_NAME) ) {
120 DEBUG( 9, ( "find_name_on_subnet: on subnet %s - self name %s NOT FOUND\n",
121 subrec->subnet_name, nmb_namestr(nmbname) ) );
122 return NULL;
123 }
124
125 DEBUG( 9, ("find_name_on_subnet: on subnet %s - found name %s source=%d\n",
126 subrec->subnet_name, nmb_namestr(nmbname), name_ret->data.source) );
127
128 return name_ret;
129 }
130
131 DEBUG( 9, ( "find_name_on_subnet: on subnet %s - name %s NOT FOUND\n",
132 subrec->subnet_name, nmb_namestr(nmbname) ) );
133
134 return NULL;
135}
136
137/**************************************************************************
138 Find a name over all known broadcast subnets.
139************************************************************************/
140
141struct name_record *find_name_for_remote_broadcast_subnet(struct nmb_name *nmbname,
142 bool self_only)
143{
144 struct subnet_record *subrec;
145 struct name_record *namerec;
146
147 for( subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec) ) {
148 namerec = find_name_on_subnet(subrec, nmbname, self_only);
149 if (namerec) {
150 return namerec;
151 }
152 }
153
154 return NULL;
155}
156
157/**************************************************************************
158 Update the ttl of an entry in a subnet name list.
159***************************************************************************/
160
161void update_name_ttl( struct name_record *namerec, int ttl )
162{
163 time_t time_now = time(NULL);
164
165 if( namerec->data.death_time != PERMANENT_TTL) {
166 namerec->data.death_time = time_now + ttl;
167 }
168
169 namerec->data.refresh_time = time_now + MIN((ttl/2), MAX_REFRESH_TIME);
170
171 if (namerec->subnet == wins_server_subnet) {
172 wins_store_changed_namerec(namerec);
173 } else {
174 namerec->subnet->namelist_changed = True;
175 }
176}
177
178/**************************************************************************
179 Add an entry to a subnet name list.
180***********************************************************************/
181
182bool add_name_to_subnet( struct subnet_record *subrec,
183 const char *name,
184 int type,
185 uint16 nb_flags,
186 int ttl,
187 enum name_source source,
188 int num_ips,
189 struct in_addr *iplist)
190{
191 bool ret = False;
192 struct name_record *namerec;
193 time_t time_now = time(NULL);
194
195 if (num_ips == 0) {
196 return false;
197 }
198
199 namerec = SMB_MALLOC_P(struct name_record);
200 if( NULL == namerec ) {
201 DEBUG( 0, ( "add_name_to_subnet: malloc fail.\n" ) );
202 return False;
203 }
204
205 memset( (char *)namerec, '\0', sizeof(*namerec) );
206 namerec->data.ip = SMB_MALLOC_ARRAY( struct in_addr, num_ips );
207 if( NULL == namerec->data.ip ) {
208 DEBUG( 0, ( "add_name_to_subnet: malloc fail when creating ip_flgs.\n" ) );
209 ZERO_STRUCTP(namerec);
210 SAFE_FREE(namerec);
211 return False;
212 }
213
214 namerec->subnet = subrec;
215
216 make_nmb_name(&namerec->name, name, type);
217 upcase_name(&namerec->name, NULL );
218
219 /* Enter the name as active. */
220 namerec->data.nb_flags = nb_flags | NB_ACTIVE;
221 namerec->data.wins_flags = WINS_ACTIVE;
222
223 /* If it's our primary name, flag it as so. */
224 if (strequal( my_netbios_names(0), name )) {
225 namerec->data.nb_flags |= NB_PERM;
226 }
227
228 /* Copy the IPs. */
229 namerec->data.num_ips = num_ips;
230 memcpy( (namerec->data.ip), iplist, num_ips * sizeof(struct in_addr) );
231
232 /* Data source. */
233 namerec->data.source = source;
234
235 /* Setup the death_time and refresh_time. */
236 if (ttl == PERMANENT_TTL) {
237 namerec->data.death_time = PERMANENT_TTL;
238 } else {
239 namerec->data.death_time = time_now + ttl;
240 }
241
242 namerec->data.refresh_time = time_now + MIN((ttl/2), MAX_REFRESH_TIME);
243
244 DEBUG( 3, ( "add_name_to_subnet: Added netbios name %s with first IP %s \
245ttl=%d nb_flags=%2x to subnet %s\n",
246 nmb_namestr( &namerec->name ),
247 inet_ntoa( *iplist ),
248 ttl,
249 (unsigned int)nb_flags,
250 subrec->subnet_name ) );
251
252 /* Now add the record to the name list. */
253
254 if (subrec == wins_server_subnet) {
255 ret = add_name_to_wins_subnet(namerec);
256 /* Free namerec - it's stored in the tdb. */
257 SAFE_FREE(namerec->data.ip);
258 SAFE_FREE(namerec);
259 } else {
260 DLIST_ADD(subrec->namelist, namerec);
261 subrec->namelist_changed = True;
262 ret = True;
263 }
264
265 return ret;
266}
267
268/*******************************************************************
269 Utility function automatically called when a name refresh or register
270 succeeds. By definition this is a SELF_NAME (or we wouldn't be registering
271 it).
272 ******************************************************************/
273
274void standard_success_register(struct subnet_record *subrec,
275 struct userdata_struct *userdata,
276 struct nmb_name *nmbname, uint16 nb_flags, int ttl,
277 struct in_addr registered_ip)
278{
279 struct name_record *namerec;
280
281 namerec = find_name_on_subnet( subrec, nmbname, FIND_SELF_NAME);
282 if (namerec == NULL) {
283 unstring name;
284 pull_ascii_nstring(name, sizeof(name), nmbname->name);
285 add_name_to_subnet( subrec, name, nmbname->name_type,
286 nb_flags, ttl, SELF_NAME, 1, &registered_ip );
287 } else {
288 update_name_ttl( namerec, ttl );
289 }
290}
291
292/*******************************************************************
293 Utility function automatically called when a name refresh or register
294 fails. Note that this is only ever called on a broadcast subnet with
295 one IP address per name. This is why it can just delete the name
296 without enumerating the IP adresses. JRA.
297 ******************************************************************/
298
299void standard_fail_register( struct subnet_record *subrec,
300 struct nmb_name *nmbname )
301{
302 struct name_record *namerec;
303
304 namerec = find_name_on_subnet( subrec, nmbname, FIND_SELF_NAME);
305
306 DEBUG( 0, ( "standard_fail_register: Failed to register/refresh name %s \
307on subnet %s\n", nmb_namestr(nmbname), subrec->subnet_name) );
308
309 /* Remove the name from the subnet. */
310 if( namerec ) {
311 remove_name_from_namelist(subrec, namerec);
312 }
313}
314
315/*******************************************************************
316 Utility function to remove an IP address from a name record.
317 ******************************************************************/
318
319static void remove_nth_ip_in_record( struct name_record *namerec, int ind)
320{
321 if( ind != namerec->data.num_ips ) {
322 memmove( (char *)(&namerec->data.ip[ind]),
323 (char *)(&namerec->data.ip[ind+1]),
324 ( namerec->data.num_ips - ind - 1) * sizeof(struct in_addr) );
325 }
326
327 namerec->data.num_ips--;
328 if (namerec->subnet == wins_server_subnet) {
329 wins_store_changed_namerec(namerec);
330 } else {
331 namerec->subnet->namelist_changed = True;
332 }
333}
334
335/*******************************************************************
336 Utility function to check if an IP address exists in a name record.
337 ******************************************************************/
338
339bool find_ip_in_name_record( struct name_record *namerec, struct in_addr ip )
340{
341 int i;
342
343 for(i = 0; i < namerec->data.num_ips; i++) {
344 if(ip_equal_v4( namerec->data.ip[i], ip)) {
345 return True;
346 }
347 }
348
349 return False;
350}
351
352/*******************************************************************
353 Utility function to add an IP address to a name record.
354 ******************************************************************/
355
356void add_ip_to_name_record( struct name_record *namerec, struct in_addr new_ip )
357{
358 struct in_addr *new_list;
359
360 /* Don't add one we already have. */
361 if( find_ip_in_name_record( namerec, new_ip )) {
362 return;
363 }
364
365 new_list = SMB_MALLOC_ARRAY( struct in_addr, namerec->data.num_ips + 1);
366 if( NULL == new_list ) {
367 DEBUG(0,("add_ip_to_name_record: Malloc fail !\n"));
368 return;
369 }
370
371 memcpy( (char *)new_list, (char *)namerec->data.ip, namerec->data.num_ips * sizeof(struct in_addr) );
372 new_list[namerec->data.num_ips] = new_ip;
373
374 SAFE_FREE(namerec->data.ip);
375 namerec->data.ip = new_list;
376 namerec->data.num_ips += 1;
377
378 if (namerec->subnet == wins_server_subnet) {
379 wins_store_changed_namerec(namerec);
380 } else {
381 namerec->subnet->namelist_changed = True;
382 }
383}
384
385/*******************************************************************
386 Utility function to remove an IP address from a name record.
387 ******************************************************************/
388
389void remove_ip_from_name_record( struct name_record *namerec,
390 struct in_addr remove_ip )
391{
392 /* Try and find the requested ip address - remove it. */
393 int i;
394 int orig_num = namerec->data.num_ips;
395
396 for(i = 0; i < orig_num; i++) {
397 if( ip_equal_v4( remove_ip, namerec->data.ip[i]) ) {
398 remove_nth_ip_in_record( namerec, i);
399 break;
400 }
401 }
402}
403
404/*******************************************************************
405 Utility function that release_name callers can plug into as the
406 success function when a name release is successful. Used to save
407 duplication of success_function code.
408 ******************************************************************/
409
410void standard_success_release( struct subnet_record *subrec,
411 struct userdata_struct *userdata,
412 struct nmb_name *nmbname,
413 struct in_addr released_ip )
414{
415 struct name_record *namerec;
416
417 namerec = find_name_on_subnet( subrec, nmbname, FIND_ANY_NAME );
418 if( namerec == NULL ) {
419 DEBUG( 0, ( "standard_success_release: Name release for name %s IP %s \
420on subnet %s. Name was not found on subnet.\n", nmb_namestr(nmbname), inet_ntoa(released_ip),
421 subrec->subnet_name) );
422 return;
423 } else {
424 int orig_num = namerec->data.num_ips;
425
426 remove_ip_from_name_record( namerec, released_ip );
427
428 if( namerec->data.num_ips == orig_num ) {
429 DEBUG( 0, ( "standard_success_release: Name release for name %s IP %s \
430on subnet %s. This ip is not known for this name.\n", nmb_namestr(nmbname), inet_ntoa(released_ip), subrec->subnet_name ) );
431 }
432 }
433
434 if( namerec->data.num_ips == 0 ) {
435 remove_name_from_namelist( subrec, namerec );
436 }
437}
438
439/*******************************************************************
440 Expires old names in a subnet namelist.
441 NB. Does not touch the wins_subnet - no wins specific processing here.
442******************************************************************/
443
444static void expire_names_on_subnet(struct subnet_record *subrec, time_t t)
445{
446 struct name_record *namerec;
447 struct name_record *next_namerec;
448
449 for( namerec = subrec->namelist; namerec; namerec = next_namerec ) {
450 next_namerec = namerec->next;
451 if( (namerec->data.death_time != PERMANENT_TTL) && (namerec->data.death_time < t) ) {
452 if( namerec->data.source == SELF_NAME ) {
453 DEBUG( 3, ( "expire_names_on_subnet: Subnet %s not expiring SELF \
454name %s\n", subrec->subnet_name, nmb_namestr(&namerec->name) ) );
455 namerec->data.death_time += 300;
456 namerec->subnet->namelist_changed = True;
457 continue;
458 }
459
460 DEBUG(3,("expire_names_on_subnet: Subnet %s - removing expired name %s\n",
461 subrec->subnet_name, nmb_namestr(&namerec->name)));
462
463 remove_name_from_namelist(subrec, namerec );
464 }
465 }
466}
467
468/*******************************************************************
469 Expires old names in all subnet namelists.
470 NB. Does not touch the wins_subnet.
471******************************************************************/
472
473void expire_names(time_t t)
474{
475 struct subnet_record *subrec;
476
477 for( subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec) ) {
478 expire_names_on_subnet( subrec, t );
479 }
480}
481
482/****************************************************************************
483 Add the magic samba names, useful for finding samba servers.
484 These go directly into the name list for a particular subnet,
485 without going through the normal registration process.
486 When adding them to the unicast subnet, add them as a list of
487 all broadcast subnet IP addresses.
488**************************************************************************/
489
490void add_samba_names_to_subnet( struct subnet_record *subrec )
491{
492 struct in_addr *iplist = &subrec->myip;
493 int num_ips = 1;
494
495 /* These names are added permanently (ttl of zero) and will NOT be refreshed. */
496
497 if( (subrec == unicast_subnet) || (subrec == wins_server_subnet) || (subrec == remote_broadcast_subnet) ) {
498 struct subnet_record *bcast_subrecs;
499 int i;
500
501 /* Create an IP list containing all our known subnets. */
502
503 num_ips = iface_count();
504 iplist = SMB_MALLOC_ARRAY( struct in_addr, num_ips);
505 if( NULL == iplist ) {
506 DEBUG(0,("add_samba_names_to_subnet: Malloc fail !\n"));
507 return;
508 }
509
510 for( bcast_subrecs = FIRST_SUBNET, i = 0; bcast_subrecs &&
511 i < num_ips;
512 bcast_subrecs = NEXT_SUBNET_EXCLUDING_UNICAST(bcast_subrecs), i++ ) {
513 iplist[i] = bcast_subrecs->myip;
514 }
515 num_ips = i;
516 }
517
518 add_name_to_subnet(subrec,"*",0x0,samba_nb_type, PERMANENT_TTL,
519 PERMANENT_NAME, num_ips, iplist);
520 add_name_to_subnet(subrec,"*",0x20,samba_nb_type,PERMANENT_TTL,
521 PERMANENT_NAME, num_ips, iplist);
522 add_name_to_subnet(subrec,"__SAMBA__",0x20,samba_nb_type,PERMANENT_TTL,
523 PERMANENT_NAME, num_ips, iplist);
524 add_name_to_subnet(subrec,"__SAMBA__",0x00,samba_nb_type,PERMANENT_TTL,
525 PERMANENT_NAME, num_ips, iplist);
526
527 if(iplist != &subrec->myip) {
528 SAFE_FREE(iplist);
529 }
530}
531
532/****************************************************************************
533 Dump a name_record struct.
534**************************************************************************/
535
536void dump_name_record( struct name_record *namerec, XFILE *fp)
537{
538 const char *src_type;
539 struct tm *tm;
540 int i;
541
542 x_fprintf(fp,"\tName = %s\t", nmb_namestr(&namerec->name));
543 switch(namerec->data.source) {
544 case LMHOSTS_NAME:
545 src_type = "LMHOSTS_NAME";
546 break;
547 case WINS_PROXY_NAME:
548 src_type = "WINS_PROXY_NAME";
549 break;
550 case REGISTER_NAME:
551 src_type = "REGISTER_NAME";
552 break;
553 case SELF_NAME:
554 src_type = "SELF_NAME";
555 break;
556 case DNS_NAME:
557 src_type = "DNS_NAME";
558 break;
559 case DNSFAIL_NAME:
560 src_type = "DNSFAIL_NAME";
561 break;
562 case PERMANENT_NAME:
563 src_type = "PERMANENT_NAME";
564 break;
565 default:
566 src_type = "unknown!";
567 break;
568 }
569
570 x_fprintf(fp,"Source = %s\nb_flags = %x\t", src_type, namerec->data.nb_flags);
571
572 if(namerec->data.death_time != PERMANENT_TTL) {
573 const char *asct;
574 tm = localtime(&namerec->data.death_time);
575 if (!tm) {
576 return;
577 }
578 asct = asctime(tm);
579 if (!asct) {
580 return;
581 }
582 x_fprintf(fp, "death_time = %s\t", asct);
583 } else {
584 x_fprintf(fp, "death_time = PERMANENT\t");
585 }
586
587 if(namerec->data.refresh_time != PERMANENT_TTL) {
588 const char *asct;
589 tm = localtime(&namerec->data.refresh_time);
590 if (!tm) {
591 return;
592 }
593 asct = asctime(tm);
594 if (!asct) {
595 return;
596 }
597 x_fprintf(fp, "refresh_time = %s\n", asct);
598 } else {
599 x_fprintf(fp, "refresh_time = PERMANENT\n");
600 }
601
602 x_fprintf(fp, "\t\tnumber of IPS = %d", namerec->data.num_ips);
603 for(i = 0; i < namerec->data.num_ips; i++) {
604 x_fprintf(fp, "\t%s", inet_ntoa(namerec->data.ip[i]));
605 }
606
607 x_fprintf(fp, "\n\n");
608
609}
610
611/****************************************************************************
612 Dump the contents of the namelists on all the subnets (including unicast)
613 into a file. Initiated by SIGHUP - used to debug the state of the namelists.
614**************************************************************************/
615
616static void dump_subnet_namelist( struct subnet_record *subrec, XFILE *fp)
617{
618 struct name_record *namerec;
619 x_fprintf(fp, "Subnet %s\n----------------------\n", subrec->subnet_name);
620 for( namerec = subrec->namelist; namerec; namerec = namerec->next) {
621 dump_name_record(namerec, fp);
622 }
623}
624
625/****************************************************************************
626 Dump the contents of the namelists on all the subnets (including unicast)
627 into a file. Initiated by SIGHUP - used to debug the state of the namelists.
628**************************************************************************/
629
630void dump_all_namelists(void)
631{
632 XFILE *fp;
633 struct subnet_record *subrec;
634
635 fp = x_fopen(lock_path("namelist.debug"),O_WRONLY|O_CREAT|O_TRUNC, 0644);
636
637 if (!fp) {
638 DEBUG(0,("dump_all_namelists: Can't open file %s. Error was %s\n",
639 "namelist.debug",strerror(errno)));
640 return;
641 }
642
643 for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec)) {
644 dump_subnet_namelist( subrec, fp );
645 }
646
647 if (!we_are_a_wins_client()) {
648 dump_subnet_namelist( unicast_subnet, fp );
649 }
650
651 if (remote_broadcast_subnet->namelist != NULL) {
652 dump_subnet_namelist( remote_broadcast_subnet, fp );
653 }
654
655 if (wins_server_subnet != NULL) {
656 dump_wins_subnet_namelist(fp );
657 }
658
659 x_fclose( fp );
660}
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