source: branches/samba-3.0/source/nmbd/nmbd_namelistdb.c@ 105

Last change on this file since 105 was 105, checked in by Paul Smedley, 18 years ago

Update source to 3.0.27a
File size: 20.3 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 2 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, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21
22*/
23
24#include "includes.h"
25
26uint16 samba_nb_type = 0; /* samba's NetBIOS name type */
27
28
29/**************************************************************************
30 Set Samba's NetBIOS name type.
31***************************************************************************/
32
33void set_samba_nb_type(void)
34{
35 if( lp_wins_support() || wins_srv_count() ) {
36 samba_nb_type = NB_HFLAG; /* samba is a 'hybrid' node type. */
37 } else {
38 samba_nb_type = NB_BFLAG; /* samba is broadcast-only node type. */
39 }
40}
41
42/***************************************************************************
43 Convert a NetBIOS name to upper case.
44***************************************************************************/
45
46static void upcase_name( struct nmb_name *target, const struct nmb_name *source )
47{
48 int i;
49 unstring targ;
50 fstring scope;
51
52 if( NULL != source ) {
53 memcpy( target, source, sizeof( struct nmb_name ) );
54 }
55
56 pull_ascii_nstring(targ, sizeof(targ), target->name);
57 strupper_m( targ );
58 push_ascii_nstring( target->name, targ);
59
60 pull_ascii(scope, target->scope, 64, -1, STR_TERMINATE);
61 strupper_m( scope );
62 push_ascii(target->scope, scope, 64, STR_TERMINATE);
63
64 /* fudge... We're using a byte-by-byte compare, so we must be sure that
65 * unused space doesn't have garbage in it.
66 */
67
68 for( i = strlen( target->name ); i < sizeof( target->name ); i++ ) {
69 target->name[i] = '\0';
70 }
71 for( i = strlen( target->scope ); i < sizeof( target->scope ); i++ ) {
72 target->scope[i] = '\0';
73 }
74}
75
76/**************************************************************************
77 Remove a name from the namelist.
78***************************************************************************/
79
80void remove_name_from_namelist(struct subnet_record *subrec,
81 struct name_record *namerec )
82{
83 if (subrec == wins_server_subnet)
84 remove_name_from_wins_namelist(namerec);
85 else {
86 subrec->namelist_changed = True;
87 DLIST_REMOVE(subrec->namelist, namerec);
88 }
89
90 SAFE_FREE(namerec->data.ip);
91 ZERO_STRUCTP(namerec);
92 SAFE_FREE(namerec);
93}
94
95/**************************************************************************
96 Find a name in a subnet.
97**************************************************************************/
98
99struct name_record *find_name_on_subnet(struct subnet_record *subrec,
100 const struct nmb_name *nmbname,
101 BOOL self_only)
102{
103 struct nmb_name uc_name;
104 struct name_record *name_ret;
105
106 upcase_name( &uc_name, nmbname );
107
108 if (subrec == wins_server_subnet) {
109 return find_name_on_wins_subnet(&uc_name, self_only);
110 }
111
112 for( name_ret = subrec->namelist; name_ret; name_ret = name_ret->next) {
113 if (memcmp(&uc_name, &name_ret->name, sizeof(struct nmb_name)) == 0) {
114 break;
115 }
116 }
117
118 if( name_ret ) {
119 /* Self names only - these include permanent names. */
120 if( self_only && (name_ret->data.source != SELF_NAME) && (name_ret->data.source != PERMANENT_NAME) ) {
121 DEBUG( 9, ( "find_name_on_subnet: on subnet %s - self name %s NOT FOUND\n",
122 subrec->subnet_name, nmb_namestr(nmbname) ) );
123 return NULL;
124 }
125
126 DEBUG( 9, ("find_name_on_subnet: on subnet %s - found name %s source=%d\n",
127 subrec->subnet_name, nmb_namestr(nmbname), name_ret->data.source) );
128
129 return name_ret;
130 }
131
132 DEBUG( 9, ( "find_name_on_subnet: on subnet %s - name %s NOT FOUND\n",
133 subrec->subnet_name, nmb_namestr(nmbname) ) );
134
135 return NULL;
136}
137
138/**************************************************************************
139 Find a name over all known broadcast subnets.
140************************************************************************/
141
142struct name_record *find_name_for_remote_broadcast_subnet(struct nmb_name *nmbname,
143 BOOL self_only)
144{
145 struct subnet_record *subrec;
146 struct name_record *namerec;
147
148 for( subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec) ) {
149 namerec = find_name_on_subnet(subrec, nmbname, self_only);
150 if (namerec) {
151 return namerec;
152 }
153 }
154
155 return NULL;
156}
157
158/**************************************************************************
159 Update the ttl of an entry in a subnet name list.
160***************************************************************************/
161
162void update_name_ttl( struct name_record *namerec, int ttl )
163{
164 time_t time_now = time(NULL);
165
166 if( namerec->data.death_time != PERMANENT_TTL) {
167 namerec->data.death_time = time_now + ttl;
168 }
169
170 namerec->data.refresh_time = time_now + MIN((ttl/2), MAX_REFRESH_TIME);
171
172 if (namerec->subnet == wins_server_subnet) {
173 wins_store_changed_namerec(namerec);
174 } else {
175 namerec->subnet->namelist_changed = True;
176 }
177}
178
179/**************************************************************************
180 Add an entry to a subnet name list.
181***********************************************************************/
182
183BOOL add_name_to_subnet( struct subnet_record *subrec,
184 const char *name,
185 int type,
186 uint16 nb_flags,
187 int ttl,
188 enum name_source source,
189 int num_ips,
190 struct in_addr *iplist)
191{
192 BOOL ret = False;
193 struct name_record *namerec;
194 time_t time_now = time(NULL);
195
196 namerec = SMB_MALLOC_P(struct name_record);
197 if( NULL == namerec ) {
198 DEBUG( 0, ( "add_name_to_subnet: malloc fail.\n" ) );
199 return False;
200 }
201
202 memset( (char *)namerec, '\0', sizeof(*namerec) );
203 namerec->data.ip = SMB_MALLOC_ARRAY( struct in_addr, num_ips );
204 if( NULL == namerec->data.ip ) {
205 DEBUG( 0, ( "add_name_to_subnet: malloc fail when creating ip_flgs.\n" ) );
206 ZERO_STRUCTP(namerec);
207 SAFE_FREE(namerec);
208 return False;
209 }
210
211 namerec->subnet = subrec;
212
213 make_nmb_name(&namerec->name, name, type);
214 upcase_name(&namerec->name, NULL );
215
216 /* Enter the name as active. */
217 namerec->data.nb_flags = nb_flags | NB_ACTIVE;
218 namerec->data.wins_flags = WINS_ACTIVE;
219
220 /* If it's our primary name, flag it as so. */
221 if (strequal( my_netbios_names(0), name )) {
222 namerec->data.nb_flags |= NB_PERM;
223 }
224
225 /* Copy the IPs. */
226 namerec->data.num_ips = num_ips;
227 memcpy( (namerec->data.ip), iplist, num_ips * sizeof(struct in_addr) );
228
229 /* Data source. */
230 namerec->data.source = source;
231
232 /* Setup the death_time and refresh_time. */
233 if (ttl == PERMANENT_TTL) {
234 namerec->data.death_time = PERMANENT_TTL;
235 } else {
236 namerec->data.death_time = time_now + ttl;
237 }
238
239 namerec->data.refresh_time = time_now + MIN((ttl/2), MAX_REFRESH_TIME);
240
241 DEBUG( 3, ( "add_name_to_subnet: Added netbios name %s with first IP %s \
242ttl=%d nb_flags=%2x to subnet %s\n",
243 nmb_namestr( &namerec->name ),
244 inet_ntoa( *iplist ),
245 ttl,
246 (unsigned int)nb_flags,
247 subrec->subnet_name ) );
248
249 /* Now add the record to the name list. */
250
251 if (subrec == wins_server_subnet) {
252 ret = add_name_to_wins_subnet(namerec);
253 /* Free namerec - it's stored in the tdb. */
254 SAFE_FREE(namerec->data.ip);
255 SAFE_FREE(namerec);
256 } else {
257 DLIST_ADD(subrec->namelist, namerec);
258 subrec->namelist_changed = True;
259 ret = True;
260 }
261
262 return ret;
263}
264
265/*******************************************************************
266 Utility function automatically called when a name refresh or register
267 succeeds. By definition this is a SELF_NAME (or we wouldn't be registering
268 it).
269 ******************************************************************/
270
271void standard_success_register(struct subnet_record *subrec,
272 struct userdata_struct *userdata,
273 struct nmb_name *nmbname, uint16 nb_flags, int ttl,
274 struct in_addr registered_ip)
275{
276 struct name_record *namerec;
277
278 namerec = find_name_on_subnet( subrec, nmbname, FIND_SELF_NAME);
279 if (namerec == NULL) {
280 unstring name;
281 pull_ascii_nstring(name, sizeof(name), nmbname->name);
282 add_name_to_subnet( subrec, name, nmbname->name_type,
283 nb_flags, ttl, SELF_NAME, 1, &registered_ip );
284 } else {
285 update_name_ttl( namerec, ttl );
286 }
287}
288
289/*******************************************************************
290 Utility function automatically called when a name refresh or register
291 fails. Note that this is only ever called on a broadcast subnet with
292 one IP address per name. This is why it can just delete the name
293 without enumerating the IP adresses. JRA.
294 ******************************************************************/
295
296void standard_fail_register( struct subnet_record *subrec,
297 struct response_record *rrec,
298 struct nmb_name *nmbname )
299{
300 struct name_record *namerec;
301
302 namerec = find_name_on_subnet( subrec, nmbname, FIND_SELF_NAME);
303
304 DEBUG( 0, ( "standard_fail_register: Failed to register/refresh name %s \
305on subnet %s\n", nmb_namestr(nmbname), subrec->subnet_name) );
306
307 /* Remove the name from the subnet. */
308 if( namerec ) {
309 remove_name_from_namelist(subrec, namerec);
310 }
311}
312
313/*******************************************************************
314 Utility function to remove an IP address from a name record.
315 ******************************************************************/
316
317static void remove_nth_ip_in_record( struct name_record *namerec, int ind)
318{
319 if( ind != namerec->data.num_ips ) {
320 memmove( (char *)(&namerec->data.ip[ind]),
321 (char *)(&namerec->data.ip[ind+1]),
322 ( namerec->data.num_ips - ind - 1) * sizeof(struct in_addr) );
323 }
324
325 namerec->data.num_ips--;
326 if (namerec->subnet == wins_server_subnet) {
327 wins_store_changed_namerec(namerec);
328 } else {
329 namerec->subnet->namelist_changed = True;
330 }
331}
332
333/*******************************************************************
334 Utility function to check if an IP address exists in a name record.
335 ******************************************************************/
336
337BOOL find_ip_in_name_record( struct name_record *namerec, struct in_addr ip )
338{
339 int i;
340
341 for(i = 0; i < namerec->data.num_ips; i++) {
342 if(ip_equal( namerec->data.ip[i], ip)) {
343 return True;
344 }
345 }
346
347 return False;
348}
349
350/*******************************************************************
351 Utility function to add an IP address to a name record.
352 ******************************************************************/
353
354void add_ip_to_name_record( struct name_record *namerec, struct in_addr new_ip )
355{
356 struct in_addr *new_list;
357
358 /* Don't add one we already have. */
359 if( find_ip_in_name_record( namerec, new_ip )) {
360 return;
361 }
362
363 new_list = SMB_MALLOC_ARRAY( struct in_addr, namerec->data.num_ips + 1);
364 if( NULL == new_list ) {
365 DEBUG(0,("add_ip_to_name_record: Malloc fail !\n"));
366 return;
367 }
368
369 memcpy( (char *)new_list, (char *)namerec->data.ip, namerec->data.num_ips * sizeof(struct in_addr) );
370 new_list[namerec->data.num_ips] = new_ip;
371
372 SAFE_FREE(namerec->data.ip);
373 namerec->data.ip = new_list;
374 namerec->data.num_ips += 1;
375
376 if (namerec->subnet == wins_server_subnet) {
377 wins_store_changed_namerec(namerec);
378 } else {
379 namerec->subnet->namelist_changed = True;
380 }
381}
382
383/*******************************************************************
384 Utility function to remove an IP address from a name record.
385 ******************************************************************/
386
387void remove_ip_from_name_record( struct name_record *namerec,
388 struct in_addr remove_ip )
389{
390 /* Try and find the requested ip address - remove it. */
391 int i;
392 int orig_num = namerec->data.num_ips;
393
394 for(i = 0; i < orig_num; i++) {
395 if( ip_equal( remove_ip, namerec->data.ip[i]) ) {
396 remove_nth_ip_in_record( namerec, i);
397 break;
398 }
399 }
400}
401
402/*******************************************************************
403 Utility function that release_name callers can plug into as the
404 success function when a name release is successful. Used to save
405 duplication of success_function code.
406 ******************************************************************/
407
408void standard_success_release( struct subnet_record *subrec,
409 struct userdata_struct *userdata,
410 struct nmb_name *nmbname,
411 struct in_addr released_ip )
412{
413 struct name_record *namerec;
414
415 namerec = find_name_on_subnet( subrec, nmbname, FIND_ANY_NAME );
416 if( namerec == NULL ) {
417 DEBUG( 0, ( "standard_success_release: Name release for name %s IP %s \
418on subnet %s. Name was not found on subnet.\n", nmb_namestr(nmbname), inet_ntoa(released_ip),
419 subrec->subnet_name) );
420 return;
421 } else {
422 int orig_num = namerec->data.num_ips;
423
424 remove_ip_from_name_record( namerec, released_ip );
425
426 if( namerec->data.num_ips == orig_num ) {
427 DEBUG( 0, ( "standard_success_release: Name release for name %s IP %s \
428on subnet %s. This ip is not known for this name.\n", nmb_namestr(nmbname), inet_ntoa(released_ip), subrec->subnet_name ) );
429 }
430 }
431
432 if( namerec->data.num_ips == 0 ) {
433 remove_name_from_namelist( subrec, namerec );
434 }
435}
436
437/*******************************************************************
438 Expires old names in a subnet namelist.
439 NB. Does not touch the wins_subnet - no wins specific processing here.
440******************************************************************/
441
442static void expire_names_on_subnet(struct subnet_record *subrec, time_t t)
443{
444 struct name_record *namerec;
445 struct name_record *next_namerec;
446
447 for( namerec = subrec->namelist; namerec; namerec = next_namerec ) {
448 next_namerec = namerec->next;
449 if( (namerec->data.death_time != PERMANENT_TTL) && (namerec->data.death_time < t) ) {
450 if( namerec->data.source == SELF_NAME ) {
451 DEBUG( 3, ( "expire_names_on_subnet: Subnet %s not expiring SELF \
452name %s\n", subrec->subnet_name, nmb_namestr(&namerec->name) ) );
453 namerec->data.death_time += 300;
454 namerec->subnet->namelist_changed = True;
455 continue;
456 }
457
458 DEBUG(3,("expire_names_on_subnet: Subnet %s - removing expired name %s\n",
459 subrec->subnet_name, nmb_namestr(&namerec->name)));
460
461 remove_name_from_namelist(subrec, namerec );
462 }
463 }
464}
465
466/*******************************************************************
467 Expires old names in all subnet namelists.
468 NB. Does not touch the wins_subnet.
469******************************************************************/
470
471void expire_names(time_t t)
472{
473 struct subnet_record *subrec;
474
475 for( subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec) ) {
476 expire_names_on_subnet( subrec, t );
477 }
478}
479
480/****************************************************************************
481 Add the magic samba names, useful for finding samba servers.
482 These go directly into the name list for a particular subnet,
483 without going through the normal registration process.
484 When adding them to the unicast subnet, add them as a list of
485 all broadcast subnet IP addresses.
486**************************************************************************/
487
488void add_samba_names_to_subnet( struct subnet_record *subrec )
489{
490 struct in_addr *iplist = &subrec->myip;
491 int num_ips = 1;
492
493 /* These names are added permanently (ttl of zero) and will NOT be refreshed. */
494
495 if( (subrec == unicast_subnet) || (subrec == wins_server_subnet) || (subrec == remote_broadcast_subnet) ) {
496 struct subnet_record *bcast_subrecs;
497 int i;
498
499 /* Create an IP list containing all our known subnets. */
500
501 num_ips = iface_count();
502 iplist = SMB_MALLOC_ARRAY( struct in_addr, num_ips);
503 if( NULL == iplist ) {
504 DEBUG(0,("add_samba_names_to_subnet: Malloc fail !\n"));
505 return;
506 }
507
508 for( bcast_subrecs = FIRST_SUBNET, i = 0; bcast_subrecs &&
509 i < num_ips;
510 bcast_subrecs = NEXT_SUBNET_EXCLUDING_UNICAST(bcast_subrecs), i++ ) {
511 iplist[i] = bcast_subrecs->myip;
512 }
513 num_ips = i;
514 }
515
516 add_name_to_subnet(subrec,"*",0x0,samba_nb_type, PERMANENT_TTL,
517 PERMANENT_NAME, num_ips, iplist);
518 add_name_to_subnet(subrec,"*",0x20,samba_nb_type,PERMANENT_TTL,
519 PERMANENT_NAME, num_ips, iplist);
520 add_name_to_subnet(subrec,"__SAMBA__",0x20,samba_nb_type,PERMANENT_TTL,
521 PERMANENT_NAME, num_ips, iplist);
522 add_name_to_subnet(subrec,"__SAMBA__",0x00,samba_nb_type,PERMANENT_TTL,
523 PERMANENT_NAME, num_ips, iplist);
524
525 if(iplist != &subrec->myip) {
526 SAFE_FREE(iplist);
527 }
528}
529
530/****************************************************************************
531 Dump a name_record struct.
532**************************************************************************/
533
534void dump_name_record( struct name_record *namerec, XFILE *fp)
535{
536 const char *src_type;
537 struct tm *tm;
538 int i;
539
540 x_fprintf(fp,"\tName = %s\t", nmb_namestr(&namerec->name));
541 switch(namerec->data.source) {
542 case LMHOSTS_NAME:
543 src_type = "LMHOSTS_NAME";
544 break;
545 case WINS_PROXY_NAME:
546 src_type = "WINS_PROXY_NAME";
547 break;
548 case REGISTER_NAME:
549 src_type = "REGISTER_NAME";
550 break;
551 case SELF_NAME:
552 src_type = "SELF_NAME";
553 break;
554 case DNS_NAME:
555 src_type = "DNS_NAME";
556 break;
557 case DNSFAIL_NAME:
558 src_type = "DNSFAIL_NAME";
559 break;
560 case PERMANENT_NAME:
561 src_type = "PERMANENT_NAME";
562 break;
563 default:
564 src_type = "unknown!";
565 break;
566 }
567
568 x_fprintf(fp,"Source = %s\nb_flags = %x\t", src_type, namerec->data.nb_flags);
569
570 if(namerec->data.death_time != PERMANENT_TTL) {
571 const char *asct;
572 tm = localtime(&namerec->data.death_time);
573 if (!tm) {
574 return;
575 }
576 asct = asctime(tm);
577 if (!asct) {
578 return;
579 }
580 x_fprintf(fp, "death_time = %s\t", asct);
581 } else {
582 x_fprintf(fp, "death_time = PERMANENT\t");
583 }
584
585 if(namerec->data.refresh_time != PERMANENT_TTL) {
586 const char *asct;
587 tm = localtime(&namerec->data.refresh_time);
588 if (!tm) {
589 return;
590 }
591 asct = asctime(tm);
592 if (!asct) {
593 return;
594 }
595 x_fprintf(fp, "refresh_time = %s\n", asct);
596 } else {
597 x_fprintf(fp, "refresh_time = PERMANENT\n");
598 }
599
600 x_fprintf(fp, "\t\tnumber of IPS = %d", namerec->data.num_ips);
601 for(i = 0; i < namerec->data.num_ips; i++) {
602 x_fprintf(fp, "\t%s", inet_ntoa(namerec->data.ip[i]));
603 }
604
605 x_fprintf(fp, "\n\n");
606
607}
608
609/****************************************************************************
610 Dump the contents of the namelists on all the subnets (including unicast)
611 into a file. Initiated by SIGHUP - used to debug the state of the namelists.
612**************************************************************************/
613
614static void dump_subnet_namelist( struct subnet_record *subrec, XFILE *fp)
615{
616 struct name_record *namerec;
617 x_fprintf(fp, "Subnet %s\n----------------------\n", subrec->subnet_name);
618 for( namerec = subrec->namelist; namerec; namerec = namerec->next) {
619 dump_name_record(namerec, fp);
620 }
621}
622
623/****************************************************************************
624 Dump the contents of the namelists on all the subnets (including unicast)
625 into a file. Initiated by SIGHUP - used to debug the state of the namelists.
626**************************************************************************/
627
628void dump_all_namelists(void)
629{
630 XFILE *fp;
631 struct subnet_record *subrec;
632
633 fp = x_fopen(lock_path("namelist.debug"),O_WRONLY|O_CREAT|O_TRUNC, 0644);
634
635 if (!fp) {
636 DEBUG(0,("dump_all_namelists: Can't open file %s. Error was %s\n",
637 "namelist.debug",strerror(errno)));
638 return;
639 }
640
641 for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec)) {
642 dump_subnet_namelist( subrec, fp );
643 }
644
645 if (!we_are_a_wins_client()) {
646 dump_subnet_namelist( unicast_subnet, fp );
647 }
648
649 if (remote_broadcast_subnet->namelist != NULL) {
650 dump_subnet_namelist( remote_broadcast_subnet, fp );
651 }
652
653 if (wins_server_subnet != NULL) {
654 dump_wins_subnet_namelist(fp );
655 }
656
657 x_fclose( fp );
658}
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