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: 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 ipgrp
;
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
, ipgrp
)) {
84 if (!lp_wins_support()) {
85 /* not a WINS server: we have to release them on the network */
86 queue_netbios_pkt_wins(d
,ClientNMB
,NMB_REL
,NAME_RELEASE
,
87 name
, type
, 0, 0,0,NULL
,NULL
,
88 False
, True
, ipzero
, ipzero
);
91 /* local interface: release them on the network */
92 queue_netbios_packet(d
,ClientNMB
,NMB_REL
,NAME_RELEASE
,
93 name
, type
, 0, 0,0,NULL
,NULL
,
94 True
, True
, d
->bcast_ip
, d
->bcast_ip
);
99 /****************************************************************************
100 add an entry to the name list
102 big note: our name will _always_ be added (if there are no objections).
103 it's just a matter of when this will be done (e.g after a time-out).
105 ****************************************************************************/
106 void add_my_name_entry(struct subnet_record
*d
,char *name
,int type
,int nb_flags
)
113 /* not that it particularly matters, but if the SELF name already exists,
114 it must be re-registered, rather than just registered */
116 make_nmb_name(&n
, name
, type
, scope
);
117 if (find_name(d
->namelist
, &n
, SELF
))
120 /* XXXX BUG: if samba is offering WINS support, it should still add the
121 name entry to a local-subnet name database. see rfc1001.txt 15.1.1 p28
122 regarding the point about M-nodes. */
124 if (ip_equal(d
->bcast_ip
, ipgrp
))
126 if (lp_wins_support())
128 /* we are a WINS server. */
129 /* XXXX assume that if we are a WINS server that we are therefore
130 not pointing to another WINS server as well. this may later NOT
134 DEBUG(4,("samba as WINS server adding: "));
135 /* this will call add_netbios_entry() */
136 name_register_work(d
, name
, type
, nb_flags
,0, ipzero
, False
);
140 /* a time-to-live allows us to refresh this name with the WINS server. */
141 queue_netbios_pkt_wins(d
,ClientNMB
,
142 re_reg
? NMB_REG_REFRESH
: NMB_REG
, NAME_REGISTER
,
143 name
, type
, nb_flags
, GET_TTL(0),0,NULL
,NULL
,
144 False
, True
, ipzero
, ipzero
);
149 /* broadcast the packet, but it comes from ipzero */
150 queue_netbios_packet(d
,ClientNMB
,
151 re_reg
? NMB_REG_REFRESH
: NMB_REG
, NAME_REGISTER
,
152 name
, type
, nb_flags
, GET_TTL(0),0,NULL
,NULL
,
153 True
, True
, d
->bcast_ip
, ipzero
);
158 /****************************************************************************
159 add the magic samba names, useful for finding samba servers
160 **************************************************************************/
161 void add_my_names(void)
163 struct subnet_record
*d
;
164 /* each subnet entry, including WINS pseudo-subnet, has SELF names */
166 /* XXXX if there was a transport layer added to samba (ipx/spx etc) then
167 there would be yet _another_ for-loop, this time on the transport type
170 for (d
= subnetlist
; d
; d
= d
->next
)
172 BOOL wins
= lp_wins_support() && ip_equal(d
->bcast_ip
,ipgrp
);
174 add_my_name_entry(d
, myname
,0x20,nb_type
|NB_ACTIVE
);
175 add_my_name_entry(d
, myname
,0x03,nb_type
|NB_ACTIVE
);
176 add_my_name_entry(d
, myname
,0x00,nb_type
|NB_ACTIVE
);
177 add_my_name_entry(d
, myname
,0x1f,nb_type
|NB_ACTIVE
);
179 /* these names are added permanently (ttl of zero) and will NOT be
180 refreshed with the WINS server */
181 add_netbios_entry(d
,"*",0x0,nb_type
|NB_ACTIVE
,0,SELF
,d
->myip
,False
,wins
);
182 add_netbios_entry(d
,"*",0x20,nb_type
|NB_ACTIVE
,0,SELF
,d
->myip
,False
,wins
);
183 add_netbios_entry(d
,"__SAMBA__",0x20,nb_type
|NB_ACTIVE
,0,SELF
,d
->myip
,False
,wins
);
184 add_netbios_entry(d
,"__SAMBA__",0x00,nb_type
|NB_ACTIVE
,0,SELF
,d
->myip
,False
,wins
);
186 if (lp_domain_logons()) {
187 /* XXXX the 0x1c is apparently something to do with domain logons */
188 add_my_name_entry(d
, lp_workgroup(),0x1c,nb_type
|NB_ACTIVE
|NB_GROUP
);
191 if (lp_domain_master() && (d
= find_subnet(ipgrp
)))
193 struct work_record
*work
= find_workgroupstruct(d
, lp_workgroup(), True
);
194 if (work
&& work
->state
== MST_NONE
)
196 work
->state
= MST_DOMAIN_NONE
;
197 become_master(d
, work
);
203 /****************************************************************************
204 remove all the samba names... from a WINS server if necessary.
205 **************************************************************************/
206 void remove_my_names()
208 struct subnet_record
*d
;
210 for (d
= subnetlist
; d
; d
= d
->next
)
212 struct name_record
*n
, *next
;
214 for (n
= d
->namelist
; n
; n
= next
)
217 if (n
->source
== SELF
)
219 /* get all SELF names removed from the WINS server's database */
220 /* XXXX note: problem occurs if this removes the wrong one! */
222 remove_name_entry(d
,n
->name
.name
, n
->name
.name_type
);
229 /*******************************************************************
231 ******************************************************************/
232 void refresh_my_names(time_t t
)
234 struct subnet_record
*d
;
236 for (d
= subnetlist
; d
; d
= d
->next
)
238 struct name_record
*n
;
240 for (n
= d
->namelist
; n
; n
= n
->next
)
242 /* each SELF name has an individual time to be refreshed */
243 if (n
->source
== SELF
&& n
->refresh_time
< time(NULL
) &&
246 add_my_name_entry(d
,n
->name
.name
,n
->name
.name_type
,
247 n
->ip_flgs
[0].nb_flags
);
248 /* they get a new lease on life :-) */
249 n
->death_time
+= GET_TTL(0);
250 n
->refresh_time
+= GET_TTL(0);
257 /*******************************************************************
258 queries names occasionally. an over-cautious, non-trusting WINS server!
260 this function has been added because nmbd could be restarted. it
261 is generally a good idea to check all the names that have been
264 XXXX which names to poll and which not can be refined at a later date.
265 ******************************************************************/
266 void query_refresh_names(void)
268 struct name_record
*n
;
269 struct subnet_record
*d
= find_subnet(ipgrp
);
271 static time_t lasttime
= 0;
272 time_t t
= time(NULL
);
275 int name_refresh_time
= NAME_POLL_REFRESH_TIME
;
276 int max_count
= name_refresh_time
* 2 / NAME_POLL_INTERVAL
;
277 if (max_count
> 10) max_count
= 10;
279 name_refresh_time
= NAME_POLL_INTERVAL
* max_count
/ 2;
281 /* if (!lp_poll_wins()) return; polling of registered names allowed */
285 if (!lasttime
) lasttime
= t
;
286 if (t
- lasttime
< NAME_POLL_INTERVAL
) return;
288 lasttime
= time(NULL
);
290 for (n
= d
->namelist
; n
; n
= n
->next
)
292 /* only do unique, registered names */
294 if (n
->source
!= REGISTER
) continue;
295 if (!NAME_GROUP(n
->ip_flgs
[0].nb_flags
)) continue;
297 if (n
->refresh_time
< t
)
299 DEBUG(3,("Polling name %s\n", namestr(&n
->name
)));
301 queue_netbios_packet(d
,ClientNMB
,NMB_QUERY
,NAME_QUERY_CONFIRM
,
302 n
->name
.name
, n
->name
.name_type
,
304 False
,False
,n
->ip_flgs
[0].ip
,n
->ip_flgs
[0].ip
);
308 if (count
>= max_count
)
310 /* don't do too many of these at once, but do enough to
311 cover everyone in the list */
315 /* this name will be checked on again, if it's not removed */
316 n
->refresh_time
+= name_refresh_time
;