source/nmbd/nmbd_workgroupdb.c

   1 /*
   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
   7
   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.
  12
  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.
  17
  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.
  21
  22 */
  23
  24 #include "includes.h"
  25
  26 extern uint16 samba_nb_type;
  27
  28 int workgroup_count = 0; /* unique index key: one for each workgroup */
  29
  30 /****************************************************************************
  31   Add a workgroup into the list.
  32 **************************************************************************/
  33
  34 static void add_workgroup(struct subnet_record *subrec, struct work_record *work)
  35 {
  36         work->subnet = subrec;
  37         DLIST_ADD(subrec->workgrouplist, work);
  38         subrec->work_changed = True;
  39 }
  40
  41 /****************************************************************************
  42  Copy name to unstring. Used by create_workgroup() and find_workgroup_on_subnet().
  43 **************************************************************************/
  44
  45 static void name_to_unstring(unstring unname, const char *name)
  46 {
  47         nstring nname;
  48
  49         errno = 0;
  50         push_ascii_nstring(nname, name);
  51         if (errno == E2BIG) {
  52                 unstring tname;
  53                 pull_ascii_nstring(tname, sizeof(tname), nname);
  54                 unstrcpy(unname, tname);
  55                 DEBUG(0,("name_to_nstring: workgroup name %s is too long. Truncating to %s\n",
  56                         name, tname));
  57         } else {
  58                 unstrcpy(unname, name);
  59         }
  60 }
  61
  62 /****************************************************************************
  63   Create an empty workgroup.
  64 **************************************************************************/
  65
  66 static struct work_record *create_workgroup(const char *name, int ttl)
  67 {
  68         struct work_record *work;
  69         struct subnet_record *subrec;
  70         int t = -1;
  71
  72         if((work = SMB_MALLOC_P(struct work_record)) == NULL) {
  73                 DEBUG(0,("create_workgroup: malloc fail !\n"));
  74                 return NULL;
  75         }
  76         memset((char *)work, '\0', sizeof(*work));
  77
  78         name_to_unstring(work->work_group, name);
  79
  80         work->serverlist = NULL;
  81
  82         work->RunningElection = False;
  83         work->ElectionCount = 0;
  84         work->announce_interval = 0;
  85         work->needelection = False;
  86         work->needannounce = True;
  87         work->lastannounce_time = time(NULL);
  88         work->mst_state = lp_local_master() ? MST_POTENTIAL : MST_NONE;
  89         work->dom_state = DOMAIN_NONE;
  90         work->log_state = LOGON_NONE;
  91
  92         work->death_time = (ttl != PERMANENT_TTL) ? time(NULL)+(ttl*3) : PERMANENT_TTL;
  93
  94         /* Make sure all token representations of workgroups are unique. */
  95
  96         for (subrec = FIRST_SUBNET; subrec && (t == -1); subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec)) {
  97                 struct work_record *w;
  98                 for (w = subrec->workgrouplist; w && t == -1; w = w->next) {
  99                         if (strequal(w->work_group, work->work_group))
 100                                 t = w->token;
 101                 }
 102         }
 103
 104         if (t == -1)
 105                 work->token = ++workgroup_count;
 106         else
 107                 work->token = t;
 108
 109         /* No known local master browser as yet. */
 110         *work->local_master_browser_name = '\0';
 111
 112         /* No known domain master browser as yet. */
 113         *work->dmb_name.name = '\0';
 114         zero_ip(&work->dmb_addr);
 115
 116         /* WfWg  uses 01040b01 */
 117         /* Win95 uses 01041501 */
 118         /* NTAS  uses ???????? */
 119         work->ElectionCriterion  = (MAINTAIN_LIST)|(BROWSER_ELECTION_VERSION<<8);
 120         work->ElectionCriterion |= (lp_os_level() << 24);
 121         if (lp_domain_master())
 122                 work->ElectionCriterion |= 0x80;
 123
 124         return work;
 125 }
 126
 127 /*******************************************************************
 128   Remove a workgroup.
 129 ******************************************************************/
 130
 131 static struct work_record *remove_workgroup_from_subnet(struct subnet_record *subrec,
 132                                      struct work_record *work)
 133 {
 134         struct work_record *ret_work = NULL;
 135
 136         DEBUG(3,("remove_workgroup: Removing workgroup %s\n", work->work_group));
 137
 138         ret_work = work->next;
 139
 140         remove_all_servers(work);
 141
 142         if (!work->serverlist) {
 143                 if (work->prev)
 144                         work->prev->next = work->next;
 145                 if (work->next)
 146                         work->next->prev = work->prev;
 147
 148                 if (subrec->workgrouplist == work)
 149                         subrec->workgrouplist = work->next;
 150
 151                 ZERO_STRUCTP(work);
 152                 SAFE_FREE(work);
 153         }
 154
 155         subrec->work_changed = True;
 156
 157         return ret_work;
 158 }
 159
 160 /****************************************************************************
 161   Find a workgroup in the workgroup list of a subnet.
 162 **************************************************************************/
 163
 164 struct work_record *find_workgroup_on_subnet(struct subnet_record *subrec,
 165                                              const char *name)
 166 {
 167         struct work_record *ret;
 168         unstring un_name;
 169
 170         DEBUG(4, ("find_workgroup_on_subnet: workgroup search for %s on subnet %s: ",
 171                 name, subrec->subnet_name));
 172
 173         name_to_unstring(un_name, name);
 174
 175         for (ret = subrec->workgrouplist; ret; ret = ret->next) {
 176                 if (strequal(ret->work_group,un_name)) {
 177                         DEBUGADD(4, ("found.\n"));
 178                         return(ret);
 179                 }
 180         }
 181         DEBUGADD(4, ("not found.\n"));
 182         return NULL;
 183 }
 184
 185 /****************************************************************************
 186   Create a workgroup in the workgroup list of the subnet.
 187 **************************************************************************/
 188
 189 struct work_record *create_workgroup_on_subnet(struct subnet_record *subrec,
 190                                                const char *name, int ttl)
 191 {
 192         struct work_record *work = NULL;
 193
 194         DEBUG(4,("create_workgroup_on_subnet: creating group %s on subnet %s\n",
 195                 name, subrec->subnet_name));
 196
 197         if ((work = create_workgroup(name, ttl))) {
 198                 add_workgroup(subrec, work);
 199                 subrec->work_changed = True;
 200                 return(work);
 201         }
 202
 203         return NULL;
 204 }
 205
 206 /****************************************************************************
 207   Update a workgroup ttl.
 208 **************************************************************************/
 209
 210 void update_workgroup_ttl(struct work_record *work, int ttl)
 211 {
 212         if(work->death_time != PERMANENT_TTL)
 213                 work->death_time = time(NULL)+(ttl*3);
 214         work->subnet->work_changed = True;
 215 }
 216
 217 /****************************************************************************
 218  Fail function called if we cannot register the WORKGROUP<0> and
 219  WORKGROUP<1e> names on the net.
 220 **************************************************************************/
 221
 222 static void fail_register(struct subnet_record *subrec, struct response_record *rrec,
 223                           struct nmb_name *nmbname)
 224 {
 225         DEBUG(0,("fail_register: Failed to register name %s on subnet %s.\n",
 226                 nmb_namestr(nmbname), subrec->subnet_name));
 227 }
 228
 229 /****************************************************************************
 230  If the workgroup is our primary workgroup, add the required names to it.
 231 **************************************************************************/
 232
 233 void initiate_myworkgroup_startup(struct subnet_record *subrec, struct work_record *work)
 234 {
 235         int i;
 236
 237         if(!strequal(lp_workgroup(), work->work_group))
 238                 return;
 239
 240         /* If this is a broadcast subnet then start elections on it if we are so configured. */
 241
 242         if ((subrec != unicast_subnet) && (subrec != remote_broadcast_subnet) &&
 243                         (subrec != wins_server_subnet) && lp_preferred_master() && lp_local_master()) {
 244                 DEBUG(3, ("initiate_myworkgroup_startup: preferred master startup for \
 245 workgroup %s on subnet %s\n", work->work_group, subrec->subnet_name));
 246                 work->needelection = True;
 247                 work->ElectionCriterion |= (1<<3);
 248         }
 249
 250         /* Register the WORKGROUP<0> and WORKGROUP<1e> names on the network. */
 251
 252         register_name(subrec,lp_workgroup(),0x0,samba_nb_type|NB_GROUP, NULL, fail_register,NULL);
 253         register_name(subrec,lp_workgroup(),0x1e,samba_nb_type|NB_GROUP, NULL, fail_register,NULL);
 254
 255         for( i = 0; my_netbios_names(i); i++) {
 256                 const char *name = my_netbios_names(i);
 257                 int stype = lp_default_server_announce() | (lp_local_master() ?  SV_TYPE_POTENTIAL_BROWSER : 0 );
 258
 259                 if(!strequal(global_myname(), name))
 260                         stype &= ~(SV_TYPE_MASTER_BROWSER|SV_TYPE_POTENTIAL_BROWSER|SV_TYPE_DOMAIN_MASTER|SV_TYPE_DOMAIN_MEMBER);
 261
 262                 create_server_on_workgroup(work,name,stype|SV_TYPE_LOCAL_LIST_ONLY, PERMANENT_TTL,
 263                                 string_truncate(lp_serverstring(), MAX_SERVER_STRING_LENGTH));
 264                 DEBUG(3,("initiate_myworkgroup_startup: Added server name entry %s \
 265 on subnet %s\n", name, subrec->subnet_name));
 266         }
 267 }
 268
 269 /****************************************************************************
 270   Dump a copy of the workgroup database into the log file.
 271   **************************************************************************/
 272
 273 void dump_workgroups(BOOL force_write)
 274 {
 275         struct subnet_record *subrec;
 276         int debuglevel = force_write ? 0 : 4;
 277
 278         for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec)) {
 279                 if (subrec->workgrouplist) {
 280                         struct work_record *work;
 281
 282                         if( DEBUGLVL( debuglevel ) ) {
 283                                 dbgtext( "dump_workgroups()\n " );
 284                                 dbgtext( "dump workgroup on subnet %15s: ", subrec->subnet_name );
 285                                 dbgtext( "netmask=%15s:\n", inet_ntoa(subrec->mask_ip) );
 286                         }
 287
 288                         for (work = subrec->workgrouplist; work; work = work->next) {
 289                                 DEBUGADD( debuglevel, ( "\t%s(%d) current master browser = %s\n", work->work_group,
 290                                         work->token, *work->local_master_browser_name ? work->local_master_browser_name : "UNKNOWN" ) );
 291                                 if (work->serverlist) {
 292                                         struct server_record *servrec;
 293                                         for (servrec = work->serverlist; servrec; servrec = servrec->next) {
 294                                                 DEBUGADD( debuglevel, ( "\t\t%s %8x (%s)\n",
 295                                                         servrec->serv.name,
 296                                                         servrec->serv.type,
 297                                                         servrec->serv.comment ) );
 298                                         }
 299                                 }
 300                         }
 301                 }
 302         }
 303 }
 304
 305 /****************************************************************************
 306   Expire any dead servers on all workgroups. If the workgroup has expired
 307   remove it.
 308   **************************************************************************/
 309
 310 void expire_workgroups_and_servers(time_t t)
 311 {
 312         struct subnet_record *subrec;
 313
 314         for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec)) {
 315                 struct work_record *work;
 316                 struct work_record *nextwork;
 317
 318                 for (work = subrec->workgrouplist; work; work = nextwork) {
 319                         nextwork = work->next;
 320                         expire_servers(work, t);
 321
 322                         if ((work->serverlist == NULL) && (work->death_time != PERMANENT_TTL) &&
 323                                         ((t == (time_t)-1) || (work->death_time < t))) {
 324                                 DEBUG(3,("expire_workgroups_and_servers: Removing timed out workgroup %s\n",
 325                                                 work->work_group));
 326                                 remove_workgroup_from_subnet(subrec, work);
 327                         }
 328                 }
 329         }
 330 }