2 Unix SMB/Netbios implementation.
4 NBT netbios routines and daemon - version 2
5 Copyright (C) Andrew Tridgell 1994-1997
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: nameserv.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 module nameserv contains name server management functions
36 extern int DEBUGLEVEL;
39 extern pstring myname;
40 extern struct in_addr ipzero;
41 extern struct in_addr wins_ip;
43 extern struct subnet_record *subnetlist;
45 extern uint16 nb_type; /* samba's NetBIOS type */
47 /****************************************************************************
48 remove an entry from the name list
50 note: the name will _always_ be removed
51 XXXX at present, the name is removed _even_ if a WINS server says keep it.
53 ****************************************************************************/
54 void remove_name_entry(struct subnet_record *d, char *name,int type)
56 /* XXXX BUG: if samba is offering WINS support, it should still broadcast
57 a de-registration packet to the local subnet before removing the
58 name from its local-subnet name database. */
61 struct name_record *n2=NULL;
63 make_nmb_name(&n.name,name,type,scope);
65 if ((n2 = find_name_search(&d, &n.name, FIND_SELF, ipzero)))
67 /* check name isn't already being de-registered */
68 if (NAME_DEREG(n2->ip_flgs[0].nb_flags))
71 /* mark the name as in the process of deletion. */
72 n2->ip_flgs[0].nb_flags &= NB_DEREG;
77 /* remove the name immediately. even if the spec says we should
78 first try to release them, this is too dangerous with our current
79 name structures as otherwise we will end up replying to names we
81 remove_netbios_name(d,name,type,SELF,n2->ip_flgs[0].ip);
83 if (ip_equal(d->bcast_ip, wins_ip))
85 if (!lp_wins_support())
87 /* not a WINS server: we have to release them on the network */
88 queue_netbios_pkt_wins(ClientNMB,NMB_REL,NAME_RELEASE,
89 name, type, 0, 0,0,NULL,NULL,
90 False, True, ipzero, ipzero);
95 /* local interface: release them on the network */
96 queue_netbios_packet(d,ClientNMB,NMB_REL,NAME_RELEASE,
97 name, type, 0, 0,0,NULL,NULL,
98 True, True, d->bcast_ip, d->bcast_ip);
103 /****************************************************************************
104 add an entry to the name list
106 big note: our name will _always_ be added (if there are no objections).
107 it's just a matter of when this will be done (e.g after a time-out).
109 ****************************************************************************/
110 void add_my_name_entry(struct subnet_record *d,char *name,int type,int nb_flags)
117 /* not that it particularly matters, but if the SELF name already exists,
118 it must be re-registered, rather than just registered */
120 make_nmb_name(&n, name, type, scope);
121 if (find_name(d->namelist, &n, SELF))
124 /* XXXX BUG: if samba is offering WINS support, it should still add the
125 name entry to a local-subnet name database. see rfc1001.txt 15.1.1 p28
126 regarding the point about M-nodes. */
128 if (ip_equal(d->bcast_ip, wins_ip))
130 if (lp_wins_support())
132 /* we are a WINS server. */
133 /* XXXX assume that if we are a WINS server that we are therefore
134 not pointing to another WINS server as well. this may later NOT
138 DEBUG(4,("samba as WINS server adding: "));
139 /* this will call add_netbios_entry() */
140 name_register_work(d, name, type, nb_flags,0, ipzero, False);
144 /* a time-to-live allows us to refresh this name with the WINS server. */
145 queue_netbios_pkt_wins(ClientNMB,
146 re_reg ? NMB_REG_REFRESH : NMB_REG, NAME_REGISTER,
147 name, type, nb_flags, GET_TTL(0),0,NULL,NULL,
148 False, True, ipzero, ipzero);
153 /* broadcast the packet, but it comes from ipzero */
154 queue_netbios_packet(d,ClientNMB,
155 re_reg ? NMB_REG_REFRESH : NMB_REG, NAME_REGISTER,
156 name, type, nb_flags, GET_TTL(0),0,NULL,NULL,
157 True, True, d->bcast_ip, ipzero);
162 /****************************************************************************
163 add the domain logon server and domain master browser names
165 this code was written so that several samba servers can co-operate in
166 sharing the task of (one server) being a domain master, and of being
167 domain logon servers.
169 **************************************************************************/
170 void add_domain_names(time_t t)
172 static time_t lastrun = 0;
173 struct subnet_record *d;
174 struct work_record *work;
177 if (lastrun != 0 && t < lastrun + CHECK_TIME_ADD_DOM_NAMES * 60) return;
180 for (d = FIRST_SUBNET; d; d = NEXT_SUBNET_INCLUDING_WINS(d))
182 work = find_workgroupstruct(d, lp_workgroup(), False);
183 if (lp_domain_logons() && work && work->log_state == LOGON_NONE)
185 make_nmb_name(&n,lp_workgroup(),0x1c,scope);
186 if (!find_name(d->namelist, &n, FIND_SELF))
188 /* logon servers are group names - we don't expect this to fail. */
189 DEBUG(0,("%s attempting to become logon server for %s %s\n",
190 timestring(), lp_workgroup(), inet_ntoa(d->bcast_ip)));
191 become_logon_server(d, work);
197 work = find_workgroupstruct(wins_subnet, lp_workgroup(), False);
199 if (lp_domain_master() && work && work->dom_state == DOMAIN_NONE)
202 DEBUG(0,("add_domain_names:Checking for domain master on workgroup %s\n", lp_workgroup()));
204 make_nmb_name(&n,lp_workgroup(),0x1b,scope);
205 if (!find_name(wins_subnet->namelist, &n, FIND_SELF))
207 DEBUG(0,("add_domain_names: attempting to become domain master browser on workgroup %s\n",
210 if (lp_wins_support())
212 /* use the wins server's capabilities (indirectly). if
213 someone has already registered the domain<1b> name with
214 the WINS server, then the WINS server's job is to _check_
215 that the owner still wants it, before giving it away.
218 DEBUG(1,("%s initiating becoming domain master for %s\n",
219 timestring(), lp_workgroup()));
220 become_domain_master(wins_subnet, work);
224 /* send out a query to establish whether there's a
225 domain controller on the WINS subnet. if not,
226 we can become a domain controller.
227 it's only polite that we check, before claiming the
231 DEBUG(0,("add_domain_names:querying WINS for domain master on workgroup %s\n", lp_workgroup()));
233 queue_netbios_pkt_wins(ClientNMB,NMB_QUERY,NAME_QUERY_DOMAIN,
234 lp_workgroup(), 0x1b,
236 False, False, ipzero, ipzero);
243 /****************************************************************************
244 add the magic samba names, useful for finding samba servers
245 **************************************************************************/
246 void add_my_names(void)
248 struct subnet_record *d;
249 /* each subnet entry, including WINS pseudo-subnet, has SELF names */
251 /* XXXX if there was a transport layer added to samba (ipx/spx etc) then
252 there would be yet _another_ for-loop, this time on the transport type
255 for (d = FIRST_SUBNET; d; d = NEXT_SUBNET_INCLUDING_WINS(d))
257 BOOL wins = (lp_wins_support() && (d == wins_subnet));
258 struct work_record *work = find_workgroupstruct(d, lp_workgroup(), False);
260 add_my_name_entry(d, myname,0x20,nb_type|NB_ACTIVE);
261 add_my_name_entry(d, myname,0x03,nb_type|NB_ACTIVE);
262 add_my_name_entry(d, myname,0x00,nb_type|NB_ACTIVE);
263 add_my_name_entry(d, myname,0x1f,nb_type|NB_ACTIVE);
265 /* these names are added permanently (ttl of zero) and will NOT be
266 refreshed with the WINS server */
267 add_netbios_entry(d,"*",0x0,nb_type|NB_ACTIVE,0,SELF,d->myip,False,wins);
268 add_netbios_entry(d,"*",0x20,nb_type|NB_ACTIVE,0,SELF,d->myip,False,wins);
269 add_netbios_entry(d,"__SAMBA__",0x20,nb_type|NB_ACTIVE,0,SELF,d->myip,False,wins);
270 add_netbios_entry(d,"__SAMBA__",0x00,nb_type|NB_ACTIVE,0,SELF,d->myip,False,wins);
275 /****************************************************************************
276 remove all the samba names... from a WINS server if necessary.
277 **************************************************************************/
278 void remove_my_names()
280 struct subnet_record *d;
282 for (d = FIRST_SUBNET; d; d = NEXT_SUBNET_INCLUDING_WINS(d))
284 struct name_record *n, *next;
286 for (n = d->namelist; n; n = next)
289 if (n->source == SELF)
291 /* get all SELF names removed from the WINS server's database */
292 /* XXXX note: problem occurs if this removes the wrong one! */
294 remove_name_entry(d,n->name.name, n->name.name_type);
301 /*******************************************************************
303 ******************************************************************/
304 void refresh_my_names(time_t t)
306 struct subnet_record *d;
308 for (d = FIRST_SUBNET; d; d = NEXT_SUBNET_INCLUDING_WINS(d))
310 struct name_record *n;
312 for (n = d->namelist; n; n = n->next)
314 /* each SELF name has an individual time to be refreshed */
315 if (n->source == SELF && n->refresh_time < t &&
318 add_my_name_entry(d,n->name.name,n->name.name_type,
319 n->ip_flgs[0].nb_flags);
320 /* they get a new lease on life :-) */
321 n->death_time += GET_TTL(0);
322 n->refresh_time += GET_TTL(0);
329 /*******************************************************************
330 queries names occasionally. an over-cautious, non-trusting WINS server!
332 this function has been added because nmbd could be restarted. it
333 is generally a good idea to check all the names that have been
336 XXXX which names to poll and which not can be refined at a later date.
337 ******************************************************************/
338 void query_refresh_names(time_t t)
340 struct name_record *n;
341 struct subnet_record *d = wins_subnet;
343 static time_t lasttime = 0;
346 int name_refresh_time = NAME_POLL_REFRESH_TIME;
347 int max_count = name_refresh_time * 2 / NAME_POLL_INTERVAL;
348 if (max_count > 10) max_count = 10;
350 name_refresh_time = NAME_POLL_INTERVAL * max_count / 2;
352 /* if (!lp_poll_wins()) return; polling of registered names allowed */
356 if (!lasttime) lasttime = t;
357 if (t - lasttime < NAME_POLL_INTERVAL) return;
359 lasttime = time(NULL);
361 for (n = d->namelist; n; n = n->next)
363 /* only do unique, registered names */
365 if (n->source != REGISTER) continue;
366 if (!NAME_GROUP(n->ip_flgs[0].nb_flags)) continue;
368 if (n->refresh_time < t)
370 DEBUG(3,("Polling name %s\n", namestr(&n->name)));
372 queue_netbios_packet(d,ClientNMB,NMB_QUERY,NAME_QUERY_CONFIRM,
373 n->name.name, n->name.name_type,
375 False,False,n->ip_flgs[0].ip,n->ip_flgs[0].ip);
379 if (count >= max_count)
381 /* don't do too many of these at once, but do enough to
382 cover everyone in the list */
386 /* this name will be checked on again, if it's not removed */
387 n->refresh_time += name_refresh_time;