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 1994-1998
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.
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.
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.
31 /*******************************************************************
32 Remove all the servers in a work group.
33 ******************************************************************/
35 void remove_all_servers(struct work_record *work)
37 struct server_record *servrec;
38 struct server_record *nexts;
40 for (servrec = work->serverlist; servrec; servrec = nexts)
42 DEBUG(7,("remove_all_servers: Removing server %s\n",servrec->serv.name));
43 nexts = servrec->next;
46 servrec->prev->next = servrec->next;
48 servrec->next->prev = servrec->prev;
50 if (work->serverlist == servrec)
51 work->serverlist = servrec->next;
53 ZERO_STRUCTP(servrec);
58 work->subnet->work_changed = True;
61 /***************************************************************************
62 Add a server into the a workgroup serverlist.
63 **************************************************************************/
65 static void add_server_to_workgroup(struct work_record *work,
66 struct server_record *servrec)
68 struct server_record *servrec2;
70 if (!work->serverlist)
72 work->serverlist = servrec;
78 for (servrec2 = work->serverlist; servrec2->next; servrec2 = servrec2->next)
81 servrec2->next = servrec;
83 servrec->prev = servrec2;
84 work->subnet->work_changed = True;
87 /****************************************************************************
88 Find a server in a server list.
89 **************************************************************************/
91 struct server_record *find_server_in_workgroup(struct work_record *work, const char *name)
93 struct server_record *ret;
95 for (ret = work->serverlist; ret; ret = ret->next)
97 if (strequal(ret->serv.name,name))
104 /****************************************************************************
105 Remove a server entry from this workgroup.
106 ****************************************************************************/
108 void remove_server_from_workgroup(struct work_record *work, struct server_record *servrec)
111 servrec->prev->next = servrec->next;
113 servrec->next->prev = servrec->prev;
115 if (work->serverlist == servrec)
116 work->serverlist = servrec->next;
118 ZERO_STRUCTP(servrec);
120 work->subnet->work_changed = True;
123 /****************************************************************************
124 Create a server entry on this workgroup.
125 ****************************************************************************/
127 struct server_record *create_server_on_workgroup(struct work_record *work,
128 const char *name,int servertype,
129 int ttl, const char *comment)
131 struct server_record *servrec;
135 DEBUG(7,("create_server_on_workgroup: not adding name starting with '*' (%s)\n",
140 if((servrec = find_server_in_workgroup(work, name)) != NULL)
142 DEBUG(0,("create_server_on_workgroup: Server %s already exists on \
143 workgroup %s. This is a bug.\n", name, work->work_group));
147 if((servrec = (struct server_record *)malloc(sizeof(*servrec))) == NULL)
149 DEBUG(0,("create_server_entry_on_workgroup: malloc fail !\n"));
153 memset((char *)servrec,'\0',sizeof(*servrec));
155 servrec->subnet = work->subnet;
157 StrnCpy(servrec->serv.name,name,sizeof(servrec->serv.name)-1);
158 StrnCpy(servrec->serv.comment,comment,sizeof(servrec->serv.comment)-1);
159 strupper(servrec->serv.name);
160 servrec->serv.type = servertype;
162 update_server_ttl(servrec, ttl);
164 add_server_to_workgroup(work, servrec);
166 DEBUG(3,("create_server_on_workgroup: Created server entry %s of type %x (%s) on \
167 workgroup %s.\n", name,servertype,comment, work->work_group));
169 work->subnet->work_changed = True;
174 /*******************************************************************
175 Update the ttl field of a server record.
176 *******************************************************************/
178 void update_server_ttl(struct server_record *servrec, int ttl)
180 if(ttl > lp_max_ttl())
183 if(is_myname(servrec->serv.name))
184 servrec->death_time = PERMANENT_TTL;
186 servrec->death_time = (ttl != PERMANENT_TTL) ? time(NULL)+(ttl*3) : PERMANENT_TTL;
188 servrec->subnet->work_changed = True;
191 /*******************************************************************
192 Expire old servers in the serverlist. A time of -1 indicates
193 everybody dies except those with a death_time of PERMANENT_TTL (which is 0).
194 This should only be called from expire_workgroups_and_servers().
195 ******************************************************************/
197 void expire_servers(struct work_record *work, time_t t)
199 struct server_record *servrec;
200 struct server_record *nexts;
202 for (servrec = work->serverlist; servrec; servrec = nexts)
204 nexts = servrec->next;
206 if ((servrec->death_time != PERMANENT_TTL) && ((t == -1) || (servrec->death_time < t)))
208 DEBUG(3,("expire_old_servers: Removing timed out server %s\n",servrec->serv.name));
209 remove_server_from_workgroup(work, servrec);
210 work->subnet->work_changed = True;
215 /*******************************************************************
216 Decide if we should write out a server record for this server.
217 We return zero if we should not. Check if we've already written
218 out this server record from an earlier subnet.
219 ******************************************************************/
221 static uint32 write_this_server_name( struct subnet_record *subrec,
222 struct work_record *work,
223 struct server_record *servrec)
225 struct subnet_record *ssub;
226 struct work_record *iwork;
228 /* Go through all the subnets we have already seen. */
229 for (ssub = FIRST_SUBNET; ssub != subrec; ssub = NEXT_SUBNET_INCLUDING_UNICAST(ssub))
231 for(iwork = ssub->workgrouplist; iwork; iwork = iwork->next)
233 if(find_server_in_workgroup( iwork, servrec->serv.name) != NULL)
236 * We have already written out this server record, don't
237 * do it again. This gives precedence to servers we have seen
238 * on the broadcast subnets over servers that may have been
239 * added via a sync on the unicast_subet.
241 * The correct way to do this is to have a serverlist file
242 * per subnet - this means changes to smbd as well. I may
243 * add this at a later date (JRA).
251 return servrec->serv.type;
254 /*******************************************************************
255 Decide if we should write out a workgroup record for this workgroup.
256 We return zero if we should not. Don't write out lp_workgroup() (we've
257 already done it) and also don't write out a second workgroup record
258 on the unicast subnet that we've already written out on one of the
260 ******************************************************************/
262 static uint32 write_this_workgroup_name( struct subnet_record *subrec,
263 struct work_record *work)
265 struct subnet_record *ssub;
267 if(strequal(lp_workgroup(), work->work_group))
270 /* This is a workgroup we have seen on a broadcast subnet. All
271 these have the same type. */
273 if(subrec != unicast_subnet)
274 return (SV_TYPE_DOMAIN_ENUM|SV_TYPE_NT|SV_TYPE_LOCAL_LIST_ONLY);
276 for(ssub = FIRST_SUBNET; ssub; ssub = NEXT_SUBNET_EXCLUDING_UNICAST(ssub))
278 /* This is the unicast subnet so check if we've already written out
279 this subnet when we passed over the broadcast subnets. */
281 if(find_workgroup_on_subnet( ssub, work->work_group) != NULL)
285 /* All workgroups on the unicast subnet (except our own, which we
286 have already written out) cannot be local. */
288 return (SV_TYPE_DOMAIN_ENUM|SV_TYPE_NT);
291 /*******************************************************************
292 Write out the browse.dat file.
293 ******************************************************************/
295 void write_browse_list_entry(XFILE *fp, const char *name, uint32 rec_type,
296 const char *local_master_browser_name, const char *description)
300 slprintf(tmp,sizeof(tmp)-1, "\"%s\"", name);
301 x_fprintf(fp, "%-25s ", tmp);
302 x_fprintf(fp, "%08x ", rec_type);
303 slprintf(tmp, sizeof(tmp)-1, "\"%s\" ", local_master_browser_name);
304 x_fprintf(fp, "%-30s", tmp);
305 x_fprintf(fp, "\"%s\"\n", description);
308 void write_browse_list(time_t t, BOOL force_write)
310 struct subnet_record *subrec;
311 struct work_record *work;
312 struct server_record *servrec;
313 pstring fname,fnamenew;
317 BOOL list_changed = force_write;
318 static time_t lasttime = 0;
320 /* Always dump if we're being told to by a signal. */
321 if(force_write == False)
325 if (t - lasttime < 5)
331 dump_workgroups(force_write);
333 for (subrec = FIRST_SUBNET; subrec ; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec))
335 if(subrec->work_changed)
347 pstrcpy(fname,lp_lockdir());
348 trim_string(fname,NULL,"/");
350 pstrcat(fname,SERVER_LIST);
351 pstrcpy(fnamenew,fname);
352 pstrcat(fnamenew,".");
354 fp = x_fopen(fnamenew,O_WRONLY|O_CREAT|O_TRUNC, 0644);
358 DEBUG(0,("write_browse_list: Can't open file %s. Error was %s\n",
359 fnamenew,strerror(errno)));
364 * Write out a record for our workgroup. Use the record from the first
368 if((work = find_workgroup_on_subnet(FIRST_SUBNET, lp_workgroup())) == NULL)
370 DEBUG(0,("write_browse_list: Fatal error - cannot find my workgroup %s\n",
376 write_browse_list_entry(fp, work->work_group,
377 SV_TYPE_DOMAIN_ENUM|SV_TYPE_NT|SV_TYPE_LOCAL_LIST_ONLY,
378 work->local_master_browser_name, work->work_group);
381 * We need to do something special for our own names.
382 * This is due to the fact that we may be a local master browser on
383 * one of our broadcast subnets, and a domain master on the unicast
384 * subnet. We iterate over the subnets and only write out the name
388 for (i=0; my_netbios_names(i); i++)
391 for (subrec = FIRST_SUBNET; subrec ; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec))
393 if((work = find_workgroup_on_subnet( subrec, lp_workgroup() )) == NULL)
395 if((servrec = find_server_in_workgroup( work, my_netbios_names(i))) == NULL)
398 stype |= servrec->serv.type;
401 /* Output server details, plus what workgroup they're in. */
402 write_browse_list_entry(fp, my_netbios_names(i), stype,
403 string_truncate(lp_serverstring(), MAX_SERVER_STRING_LENGTH), lp_workgroup());
406 for (subrec = FIRST_SUBNET; subrec ; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec))
408 subrec->work_changed = False;
410 for (work = subrec->workgrouplist; work ; work = work->next)
412 /* Write out a workgroup record for a workgroup. */
413 uint32 wg_type = write_this_workgroup_name( subrec, work);
417 write_browse_list_entry(fp, work->work_group, wg_type,
418 work->local_master_browser_name,
422 /* Now write out any server records a workgroup may have. */
424 for (servrec = work->serverlist; servrec ; servrec = servrec->next)
428 /* We have already written our names here. */
429 if(is_myname(servrec->serv.name))
432 serv_type = write_this_server_name(subrec, work, servrec);
436 /* Output server details, plus what workgroup they're in. */
437 write_browse_list_entry(fp, servrec->serv.name, serv_type,
438 servrec->serv.comment, work->work_group);
446 chmod(fnamenew,0644);
447 rename(fnamenew,fname);
448 DEBUG(3,("write_browse_list: Wrote browse list into file %s\n",fname));