2 Unix SMB/Netbios implementation.
4 NBT netbios routines and daemon - version 2
5 Copyright (C) Andrew Tridgell 1994-1996
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 Module name: namedbname.c
25 14 jan 96: lkcl@pires.co.uk
26 added multiple workgroup domain master support
28 04 jul 96: lkcl@pires.co.uk
29 created module namedbname containing name database functions
34 extern int DEBUGLEVEL;
37 extern struct in_addr ipzero;
38 extern struct in_addr ipgrp;
40 extern struct subnet_record *subnetlist;
42 #define WINS_LIST "wins.dat"
45 /****************************************************************************
46 true if two netbios names are equal
47 ****************************************************************************/
48 BOOL name_equal(struct nmb_name *n1,struct nmb_name *n2)
50 return n1->name_type == n2->name_type &&
51 strequal(n1->name ,n2->name ) &&
52 strequal(n1->scope,n2->scope);
56 /****************************************************************************
57 true if the netbios name is ^1^2__MSBROWSE__^2^1
59 note: this name is registered if as a master browser or backup browser
60 you are responsible for a workgroup (when you announce a domain by
61 broadcasting on your local subnet, you announce it as coming from this
62 name: see announce_host()).
64 **************************************************************************/
65 BOOL ms_browser_name(char *name, int type)
67 return strequal(name,MSBROWSE) && type == 0x01;
71 /****************************************************************************
72 add a netbios name into the namelist
73 **************************************************************************/
74 static void add_name(struct subnet_record *d, struct name_record *n)
76 struct name_record *n2;
88 for (n2 = d->namelist; n2->next; n2 = n2->next) ;
96 /****************************************************************************
97 remove a name from the namelist. The pointer must be an element just
99 **************************************************************************/
100 void remove_name(struct subnet_record *d, struct name_record *n)
102 struct name_record *nlist;
107 while (nlist && nlist != n) nlist = nlist->next;
111 if (nlist->next) nlist->next->prev = nlist->prev;
112 if (nlist->prev) nlist->prev->next = nlist->next;
118 /****************************************************************************
119 find a name in a namelist.
120 **************************************************************************/
121 struct name_record *find_name(struct name_record *n,
122 struct nmb_name *name,
125 struct name_record *ret;
127 for (ret = n; ret; ret = ret->next)
129 if (name_equal(&ret->name,name))
131 /* self search: self names only */
132 if ((search&FIND_SELF) == FIND_SELF && ret->source != SELF)
142 /****************************************************************************
143 find a name in the domain database namelist
144 search can be any of:
145 FIND_SELF - look exclusively for names the samba server has added for itself
146 FIND_LOCAL - look for names in the local subnet record.
147 FIND_WINS - look for names in the WINS record
148 **************************************************************************/
149 struct name_record *find_name_search(struct subnet_record **d,
150 struct nmb_name *name,
151 int search, struct in_addr ip)
153 if (d == NULL) return NULL; /* bad error! */
155 if ((search & FIND_LOCAL) == FIND_LOCAL)
159 DEBUG(4,("find_name on local: %s %s search %x\n",
160 namestr(name),inet_ntoa(ip), search));
161 return find_name((*d)->namelist, name, search);
165 DEBUG(4,("local find_name_search with a NULL subnet pointer\n"));
170 if ((search & FIND_WINS) != FIND_WINS) return NULL;
174 /* find WINS subnet record */
175 *d = find_subnet(ipgrp);
178 if (*d == NULL) return NULL;
180 DEBUG(4,("find_name on WINS: %s %s search %x\n",
181 namestr(name),inet_ntoa(ip), search));
182 return find_name((*d)->namelist, name, search);
186 /****************************************************************************
187 dump a copy of the name table
188 **************************************************************************/
189 void dump_names(void)
191 struct name_record *n;
192 struct subnet_record *d;
193 fstring fname, fnamenew;
194 time_t t = time(NULL);
198 strcpy(fname,lp_lockdir());
199 trim_string(fname,NULL,"/");
201 strcat(fname,WINS_LIST);
202 strcpy(fnamenew,fname);
203 strcat(fnamenew,".");
205 f = fopen(fnamenew,"w");
209 DEBUG(4,("Can't open %s - %s\n",fnamenew,strerror(errno)));
212 DEBUG(3,("Dump of local name table:\n"));
214 for (d = subnetlist; d; d = d->next)
215 for (n = d->namelist; n; n = n->next)
217 if (f && ip_equal(d->bcast_ip, ipgrp) && n->source == REGISTER)
221 /* XXXX i have little imagination as to how to output nb_flags as
222 anything other than as a hexadecimal number :-) */
224 sprintf(data, "%s#%02x %s %2x %ld",
225 n->name.name,n->name.name_type, /* XXXX ignore the scope for now */
229 fprintf(f, "%s\n", data);
232 DEBUG(3,("%15s ", inet_ntoa(d->bcast_ip)));
233 DEBUG(3,("%15s ", inet_ntoa(d->mask_ip)));
234 DEBUG(3,("%-19s %15s NB=%2x TTL=%ld \n",
238 n->death_time?n->death_time-t:0));
243 chmod(fnamenew,0644);
244 rename(fnamenew,fname);
246 DEBUG(3,("Wrote wins database %s\n",fname));
250 /****************************************************************************
251 load a netbios name database file
252 ****************************************************************************/
253 void load_netbios_names(void)
255 struct subnet_record *d = find_subnet(ipgrp);
263 strcpy(fname,lp_lockdir());
264 trim_string(fname,NULL,"/");
266 strcat(fname,WINS_LIST);
268 f = fopen(fname,"r");
271 DEBUG(2,("Can't open wins database file %s\n",fname));
277 pstring name_str, ip_str, ttd_str, nb_flags_str;
283 struct in_addr ipaddr;
285 enum name_source source;
292 if (!fgets_slash(line,sizeof(pstring),f)) continue;
294 if (*line == '#') continue;
298 if (next_token(&ptr,name_str ,NULL)) ++count;
299 if (next_token(&ptr,ip_str ,NULL)) ++count;
300 if (next_token(&ptr,ttd_str ,NULL)) ++count;
301 if (next_token(&ptr,nb_flags_str,NULL)) ++count;
303 if (count <= 0) continue;
306 DEBUG(0,("Ill formed wins line"));
307 DEBUG(0,("[%s]: name#type ip nb_flags abs_time\n",line));
311 /* netbios name. # divides the name from the type (hex): netbios#xx */
312 strcpy(name,name_str);
314 p = strchr(name,'#');
318 sscanf(p+1,"%x",&type);
321 /* decode the netbios flags (hex) and the time-to-die (seconds) */
322 sscanf(nb_flags_str,"%x",&nb_flags);
323 sscanf(ttd_str,"%ld",&ttd);
325 ipaddr = *interpret_addr2(ip_str);
327 if (ip_equal(ipaddr,ipzero)) {
335 DEBUG(4, ("add WINS line: %s#%02x %s %ld %2x\n",
336 name,type, inet_ntoa(ipaddr), ttd, nb_flags));
338 /* add all entries that have 60 seconds or more to live */
339 if (ttd - 60 < time(NULL) || ttd == 0)
341 time_t t = (ttd?ttd-time(NULL):0) / 3;
343 /* add netbios entry read from the wins.dat file. IF it's ok */
344 add_netbios_entry(d,name,type,nb_flags,t,source,ipaddr,True,True);
352 /****************************************************************************
353 remove an entry from the name list
354 ****************************************************************************/
355 void remove_netbios_name(struct subnet_record *d,
356 char *name,int type, enum name_source source,
360 struct name_record *n;
362 make_nmb_name(&nn, name, type, scope);
363 n = find_name_search(&d, &nn, FIND_LOCAL, ip);
365 if (n && n->source == source) remove_name(d,n);
369 /****************************************************************************
370 add an entry to the name list.
372 this is a multi-purpose function.
374 it adds samba's own names in to its records on each interface, keeping a
375 record of whether it is a master browser, domain master, or WINS server.
377 it also keeps a record of WINS entries.
379 ****************************************************************************/
380 struct name_record *add_netbios_entry(struct subnet_record *d,
381 char *name, int type, int nb_flags,
382 int ttl, enum name_source source, struct in_addr ip,
383 BOOL new_only,BOOL wins)
385 struct name_record *n;
386 struct name_record *n2=NULL;
388 BOOL self = source == SELF;
390 /* add the name to the WINS list if the name comes from a directed query */
391 search |= wins ? FIND_WINS : FIND_LOCAL;
392 /* search for SELF names only */
393 search |= self ? FIND_SELF : 0;
397 if (!wins && type != 0x1b)
399 /* the only broadcast (non-WINS) names we are adding are ours
400 (SELF) and PDC type names */
405 n = (struct name_record *)malloc(sizeof(*n));
406 if (!n) return(NULL);
408 bzero((char *)n,sizeof(*n));
410 make_nmb_name(&n->name,name,type,scope);
412 if ((n2 = find_name_search(&d, &n->name, search, new_only?ipzero:ip)))
415 if (new_only || (n2->source==SELF && source!=SELF)) return n2;
420 n->death_time = time(NULL)+ttl*3;
421 n->refresh_time = time(NULL)+GET_TTL(ttl);
424 n->nb_flags = nb_flags;
427 if (!n2) add_name(d,n);
429 DEBUG(3,("Added netbios name %s at %s ttl=%d nb_flags=%2x\n",
430 namestr(&n->name),inet_ntoa(ip),ttl,nb_flags));
436 /*******************************************************************
437 expires old names in the namelist
438 ******************************************************************/
439 void expire_names(time_t t)
441 struct name_record *n;
442 struct name_record *next;
443 struct subnet_record *d;
445 /* expire old names */
446 for (d = subnetlist; d; d = d->next)
448 for (n = d->namelist; n; n = next)
450 if (n->death_time && n->death_time < t)
452 DEBUG(3,("Removing dead name %s\n", namestr(&n->name)));
456 if (n->prev) n->prev->next = n->next;
457 if (n->next) n->next->prev = n->prev;
459 if (d->namelist == n) d->namelist = n->next;
472 /***************************************************************************
473 reply to a name query
474 ****************************************************************************/
475 struct name_record *search_for_name(struct subnet_record **d,
476 struct nmb_name *question,
477 struct in_addr ip, int Time, int search)
479 int name_type = question->name_type;
480 char *qname = question->name;
481 BOOL dns_type = name_type == 0x20 || name_type == 0;
483 struct name_record *n;
485 DEBUG(3,("Search for %s from %s - ", namestr(question), inet_ntoa(ip)));
487 /* first look up name in cache */
488 n = find_name_search(d,question,search,ip);
490 if (*d == NULL) return NULL;
492 DEBUG(4,("subnet %s ", inet_ntoa((*d)->bcast_ip)));
494 /* now try DNS lookup. */
497 struct in_addr dns_ip;
500 /* only do DNS lookups if the query is for type 0x20 or type 0x0 */
501 if (!dns_type && name_type != 0x1b)
503 DEBUG(3,("types 0x20 0x1b 0x0 only: name not found\n"));
507 /* look it up with DNS */
508 a = interpret_addr(qname);
510 putip((char *)&dns_ip,(char *)&a);
514 /* no luck with DNS. We could possibly recurse here XXXX */
515 DEBUG(3,("no recursion.\n"));
516 /* add the fail to our WINS cache of names. give it 1 hour in the cache */
517 add_netbios_entry(*d,qname,name_type,NB_ACTIVE,60*60,DNSFAIL,dns_ip,
522 /* add it to our WINS cache of names. give it 2 hours in the cache */
523 n = add_netbios_entry(*d,qname,name_type,NB_ACTIVE,2*60*60,DNS,dns_ip,
526 /* failed to add it? yikes! */
530 /* is our entry already dead? */
533 if (n->death_time < Time) return False;
536 /* it may have been an earlier failure */
537 if (n->source == DNSFAIL)
539 DEBUG(3,("DNSFAIL\n"));
543 DEBUG(3,("OK %s\n",inet_ntoa(n->ip)));