source/nmbd/nmbd_workgroupdb.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    NBT netbios routines and daemon - version 2
   5    Copyright (C) Andrew Tridgell 1994-1998
   6    Copyright (C) Luke Kenneth Casson Leighton 1994-1998
   7    Copyright (C) Jeremy Allison 1994-1998
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22
  23 */
  24
  25 #include "includes.h"
  26 #include "smb.h"
  27
  28 extern int ClientNMB;
  29
  30 extern pstring global_myname;
  31 extern fstring global_myworkgroup;
  32 extern char **my_netbios_names;
  33 extern uint16 samba_nb_type;
  34
  35 int workgroup_count = 0; /* unique index key: one for each workgroup */
  36
  37 /****************************************************************************
  38   Add a workgroup into the list.
  39   **************************************************************************/
  40
  41 static void add_workgroup(struct subnet_record *subrec, struct work_record *work)
  42 {
  43         work->subnet = subrec;
  44         DLIST_ADD(subrec->workgrouplist, work);
  45         subrec->work_changed = True;
  46 }
  47
  48 /****************************************************************************
  49   Create an empty workgroup.
  50   **************************************************************************/
  51
  52 static struct work_record *create_workgroup(const char *name, int ttl)
  53 {
  54   struct work_record *work;
  55   struct subnet_record *subrec;
  56   int t = -1;
  57
  58   if((work = (struct work_record *)malloc(sizeof(*work))) == NULL)
  59   {
  60     DEBUG(0,("create_workgroup: malloc fail !\n"));
  61     return NULL;
  62   }
  63   memset((char *)work, '\0', sizeof(*work));
  64
  65   StrnCpy(work->work_group,name,sizeof(work->work_group)-1);
  66   work->serverlist = NULL;
  67
  68   work->RunningElection = False;
  69   work->ElectionCount = 0;
  70   work->announce_interval = 0;
  71   work->needelection = False;
  72   work->needannounce = True;
  73   work->lastannounce_time = time(NULL);
  74   work->mst_state = lp_local_master() ? MST_POTENTIAL : MST_NONE;
  75   work->dom_state = DOMAIN_NONE;
  76   work->log_state = LOGON_NONE;
  77
  78   work->death_time = (ttl != PERMANENT_TTL) ? time(NULL)+(ttl*3) : PERMANENT_TTL;
  79
  80   /* Make sure all token representations of workgroups are unique. */
  81
  82   for (subrec = FIRST_SUBNET; subrec && (t == -1);
  83            subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec))
  84   {
  85     struct work_record *w;
  86     for (w = subrec->workgrouplist; w && t == -1; w = w->next)
  87     {
  88       if (strequal(w->work_group, work->work_group))
  89         t = w->token;
  90     }
  91   }
  92
  93   if (t == -1)
  94     work->token = ++workgroup_count;
  95   else
  96     work->token = t;
  97
  98   /* No known local master browser as yet. */
  99   *work->local_master_browser_name = '\0';
 100
 101   /* No known domain master browser as yet. */
 102   *work->dmb_name.name = '\0';
 103   zero_ip(&work->dmb_addr);
 104
 105   /* WfWg  uses 01040b01 */
 106   /* Win95 uses 01041501 */
 107   /* NTAS  uses ???????? */
 108   work->ElectionCriterion  = (MAINTAIN_LIST)|(BROWSER_ELECTION_VERSION<<8);
 109   work->ElectionCriterion |= (lp_os_level() << 24);
 110   if (lp_domain_master())
 111     work->ElectionCriterion |= 0x80;
 112
 113   return work;
 114 }
 115
 116 /*******************************************************************
 117   Remove a workgroup.
 118   ******************************************************************/
 119
 120 static struct work_record *remove_workgroup_from_subnet(struct subnet_record *subrec,
 121                                      struct work_record *work)
 122 {
 123   struct work_record *ret_work = NULL;
 124
 125   DEBUG(3,("remove_workgroup: Removing workgroup %s\n", work->work_group));
 126
 127   ret_work = work->next;
 128
 129   remove_all_servers(work);
 130
 131   if (!work->serverlist)
 132   {
 133     if (work->prev)
 134       work->prev->next = work->next;
 135     if (work->next)
 136       work->next->prev = work->prev;
 137
 138     if (subrec->workgrouplist == work)
 139       subrec->workgrouplist = work->next;
 140
 141     ZERO_STRUCTP(work);
 142     free((char *)work);
 143   }
 144
 145   subrec->work_changed = True;
 146
 147   return ret_work;
 148 }
 149
 150
 151 /****************************************************************************
 152   Find a workgroup in the workgroup list of a subnet.
 153   **************************************************************************/
 154
 155 struct work_record *find_workgroup_on_subnet(struct subnet_record *subrec,
 156                                              const char *name)
 157 {
 158   struct work_record *ret;
 159
 160   DEBUG(4, ("find_workgroup_on_subnet: workgroup search for %s on subnet %s: ",
 161             name, subrec->subnet_name));
 162
 163   for (ret = subrec->workgrouplist; ret; ret = ret->next)
 164   {
 165     if (!strcmp(ret->work_group,name))
 166     {
 167       DEBUGADD(4, ("found.\n"));
 168       return(ret);
 169     }
 170   }
 171   DEBUGADD(4, ("not found.\n"));
 172   return NULL;
 173 }
 174
 175 /****************************************************************************
 176   Create a workgroup in the workgroup list of the subnet.
 177   **************************************************************************/
 178
 179 struct work_record *create_workgroup_on_subnet(struct subnet_record *subrec,
 180                                                const char *name, int ttl)
 181 {
 182   struct work_record *work = NULL;
 183
 184   DEBUG(4,("create_workgroup_on_subnet: creating group %s on subnet %s\n",
 185            name, subrec->subnet_name));
 186
 187   if ((work = create_workgroup(name, ttl)))
 188   {
 189     add_workgroup(subrec, work);
 190
 191     subrec->work_changed = True;
 192
 193     return(work);
 194   }
 195
 196   return NULL;
 197 }
 198
 199 /****************************************************************************
 200   Update a workgroup ttl.
 201   **************************************************************************/
 202
 203 void update_workgroup_ttl(struct work_record *work, int ttl)
 204 {
 205   if(work->death_time != PERMANENT_TTL)
 206     work->death_time = time(NULL)+(ttl*3);
 207   work->subnet->work_changed = True;
 208 }
 209
 210 /****************************************************************************
 211  Fail function called if we cannot register the WORKGROUP<0> and
 212  WORKGROUP<1e> names on the net.
 213 **************************************************************************/
 214
 215 static void fail_register(struct subnet_record *subrec, struct response_record *rrec,
 216                           struct nmb_name *nmbname)
 217 {
 218   DEBUG(0,("fail_register: Failed to register name %s on subnet %s.\n",
 219             nmb_namestr(nmbname), subrec->subnet_name));
 220 }
 221
 222 /****************************************************************************
 223  If the workgroup is our primary workgroup, add the required names to it.
 224 **************************************************************************/
 225
 226 void initiate_myworkgroup_startup(struct subnet_record *subrec, struct work_record *work)
 227 {
 228   int i;
 229
 230   if(!strequal(global_myworkgroup, work->work_group))
 231     return;
 232
 233   /* If this is a broadcast subnet then start elections on it
 234      if we are so configured. */
 235
 236   if ((subrec != unicast_subnet) && (subrec != remote_broadcast_subnet) &&
 237       (subrec != wins_server_subnet) && lp_preferred_master() &&
 238       lp_local_master())
 239   {
 240     DEBUG(3, ("initiate_myworkgroup_startup: preferred master startup for \
 241 workgroup %s on subnet %s\n", work->work_group, subrec->subnet_name));
 242     work->needelection = True;
 243     work->ElectionCriterion |= (1<<3);
 244   }
 245
 246   /* Register the WORKGROUP<0> and WORKGROUP<1e> names on the network. */
 247
 248   register_name(subrec,global_myworkgroup,0x0,samba_nb_type|NB_GROUP,
 249                 NULL,
 250                 fail_register,NULL);
 251
 252   register_name(subrec,global_myworkgroup,0x1e,samba_nb_type|NB_GROUP,
 253                 NULL,
 254                 fail_register,NULL);
 255
 256   for( i = 0; my_netbios_names[i]; i++)
 257   {
 258     char *name = my_netbios_names[i];
 259     int stype = lp_default_server_announce() | (lp_local_master() ?
 260                         SV_TYPE_POTENTIAL_BROWSER : 0 );
 261
 262     if(!strequal(global_myname, name))
 263         stype &= ~(SV_TYPE_MASTER_BROWSER|SV_TYPE_POTENTIAL_BROWSER|
 264                    SV_TYPE_DOMAIN_MASTER|SV_TYPE_DOMAIN_MEMBER);
 265
 266     create_server_on_workgroup(work,name,stype|SV_TYPE_LOCAL_LIST_ONLY,
 267                                PERMANENT_TTL,
 268                                string_truncate(lp_serverstring(), MAX_SERVER_STRING_LENGTH));
 269     DEBUG(3,("initiate_myworkgroup_startup: Added server name entry %s \
 270 on subnet %s\n", name, subrec->subnet_name));
 271   }
 272 }
 273
 274 /****************************************************************************
 275   Dump a copy of the workgroup database into the log file.
 276   **************************************************************************/
 277
 278 void dump_workgroups(BOOL force_write)
 279 {
 280   struct subnet_record *subrec;
 281   int debuglevel = force_write ? 0 : 4;
 282
 283   for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec))
 284   {
 285     if (subrec->workgrouplist)
 286     {
 287       struct work_record *work;
 288
 289       if( DEBUGLVL( debuglevel ) )
 290       {
 291         dbgtext( "dump_workgroups()\n " );
 292         dbgtext( "dump workgroup on subnet %15s: ", subrec->subnet_name );
 293         dbgtext( "netmask=%15s:\n", inet_ntoa(subrec->mask_ip) );
 294       }
 295
 296       for (work = subrec->workgrouplist; work; work = work->next)
 297       {
 298         DEBUGADD( debuglevel, ( "\t%s(%d) current master browser = %s\n",
 299                                 work->work_group,
 300                                 work->token,
 301                                *work->local_master_browser_name
 302                               ? work->local_master_browser_name : "UNKNOWN" ) );
 303         if (work->serverlist)
 304         {
 305           struct server_record *servrec;
 306           for (servrec = work->serverlist; servrec; servrec = servrec->next)
 307           {
 308             DEBUGADD( debuglevel, ( "\t\t%s %8x (%s)\n",
 309                                     servrec->serv.name,
 310                                     servrec->serv.type,
 311                                     servrec->serv.comment ) );
 312           }
 313         }
 314       }
 315     }
 316   }
 317 }
 318
 319 /****************************************************************************
 320   Expire any dead servers on all workgroups. If the workgroup has expired
 321   remove it.
 322   **************************************************************************/
 323
 324 void expire_workgroups_and_servers(time_t t)
 325 {
 326   struct subnet_record *subrec;
 327
 328   for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec))
 329   {
 330     struct work_record *work;
 331     struct work_record *nextwork;
 332
 333     for (work = subrec->workgrouplist; work; work = nextwork)
 334     {
 335       nextwork = work->next;
 336       expire_servers(work, t);
 337
 338       if ((work->serverlist == NULL) && (work->death_time != PERMANENT_TTL) &&
 339                      ((t == -1) || (work->death_time < t)))
 340       {
 341         DEBUG(3,("expire_workgroups_and_servers: Removing timed out workgroup %s\n",
 342                   work->work_group));
 343         remove_workgroup_from_subnet(subrec, work);
 344       }
 345     }
 346   }
 347 }