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 3 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, see <http://www.gnu.org/licenses/>.
  20
  21 */
  22
  23 #include "includes.h"
  24
  25 extern uint16 samba_nb_type;
  26
  27 int workgroup_count = 0; /* unique index key: one for each workgroup */
  28
  29 /****************************************************************************
  30   Add a workgroup into the list.
  31 **************************************************************************/
  32
  33 static void add_workgroup(struct subnet_record *subrec, struct work_record *work)
  34 {
  35         work->subnet = subrec;
  36         DLIST_ADD(subrec->workgrouplist, work);
  37         subrec->work_changed = True;
  38 }
  39
  40 /****************************************************************************
  41  Copy name to unstring. Used by create_workgroup() and find_workgroup_on_subnet().
  42 **************************************************************************/
  43
  44 static void name_to_unstring(unstring unname, const char *name)
  45 {
  46         nstring nname;
  47
  48         errno = 0;
  49         push_ascii_nstring(nname, name);
  50         if (errno == E2BIG) {
  51                 unstring tname;
  52                 pull_ascii_nstring(tname, sizeof(tname), nname);
  53                 unstrcpy(unname, tname);
  54                 DEBUG(0,("name_to_nstring: workgroup name %s is too long. Truncating to %s\n",
  55                         name, tname));
  56         } else {
  57                 unstrcpy(unname, name);
  58         }
  59 }
  60
  61 /****************************************************************************
  62   Create an empty workgroup.
  63 **************************************************************************/
  64
  65 static struct work_record *create_workgroup(const char *name, int ttl)
  66 {
  67         struct work_record *work;
  68         struct subnet_record *subrec;
  69         int t = -1;
  70
  71         if((work = SMB_MALLOC_P(struct work_record)) == NULL) {
  72                 DEBUG(0,("create_workgroup: malloc fail !\n"));
  73                 return NULL;
  74         }
  75         memset((char *)work, '\0', sizeof(*work));
  76
  77         name_to_unstring(work->work_group, name);
  78
  79         work->serverlist = NULL;
  80
  81         work->RunningElection = False;
  82         work->ElectionCount = 0;
  83         work->announce_interval = 0;
  84         work->needelection = False;
  85         work->needannounce = True;
  86         work->lastannounce_time = time(NULL);
  87         work->mst_state = lp_local_master() ? MST_POTENTIAL : MST_NONE;
  88         work->dom_state = DOMAIN_NONE;
  89         work->log_state = LOGON_NONE;
  90
  91         work->death_time = (ttl != PERMANENT_TTL) ? time(NULL)+(ttl*3) : PERMANENT_TTL;
  92
  93         /* Make sure all token representations of workgroups are unique. */
  94
  95         for (subrec = FIRST_SUBNET; subrec && (t == -1); subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec)) {
  96                 struct work_record *w;
  97                 for (w = subrec->workgrouplist; w && t == -1; w = w->next) {
  98                         if (strequal(w->work_group, work->work_group))
  99                                 t = w->token;
 100                 }
 101         }
 102
 103         if (t == -1)
 104                 work->token = ++workgroup_count;
 105         else
 106                 work->token = t;
 107
 108         /* No known local master browser as yet. */
 109         *work->local_master_browser_name = '\0';
 110
 111         /* No known domain master browser as yet. */
 112         *work->dmb_name.name = '\0';
 113         zero_ip_v4(&work->dmb_addr);
 114
 115         /* WfWg  uses 01040b01 */
 116         /* Win95 uses 01041501 */
 117         /* NTAS  uses ???????? */
 118         work->ElectionCriterion  = (MAINTAIN_LIST)|(BROWSER_ELECTION_VERSION<<8);
 119         work->ElectionCriterion |= (lp_os_level() << 24);
 120         if (lp_domain_master())
 121                 work->ElectionCriterion |= 0x80;
 122
 123         return work;
 124 }
 125
 126 /*******************************************************************
 127   Remove a workgroup.
 128 ******************************************************************/
 129
 130 static struct work_record *remove_workgroup_from_subnet(struct subnet_record *subrec,
 131                                      struct work_record *work)
 132 {
 133         struct work_record *ret_work = NULL;
 134
 135         DEBUG(3,("remove_workgroup: Removing workgroup %s\n", work->work_group));
 136
 137         ret_work = work->next;
 138
 139         remove_all_servers(work);
 140
 141         if (!work->serverlist) {
 142                 if (work->prev)
 143                         work->prev->next = work->next;
 144                 if (work->next)
 145                         work->next->prev = work->prev;
 146
 147                 if (subrec->workgrouplist == work)
 148                         subrec->workgrouplist = work->next;
 149
 150                 ZERO_STRUCTP(work);
 151                 SAFE_FREE(work);
 152         }
 153
 154         subrec->work_changed = True;
 155
 156         return ret_work;
 157 }
 158
 159 /****************************************************************************
 160   Find a workgroup in the workgroup list of a subnet.
 161 **************************************************************************/
 162
 163 struct work_record *find_workgroup_on_subnet(struct subnet_record *subrec,
 164                                              const char *name)
 165 {
 166         struct work_record *ret;
 167         unstring un_name;
 168
 169         DEBUG(4, ("find_workgroup_on_subnet: workgroup search for %s on subnet %s: ",
 170                 name, subrec->subnet_name));
 171
 172         name_to_unstring(un_name, name);
 173
 174         for (ret = subrec->workgrouplist; ret; ret = ret->next) {
 175                 if (strequal(ret->work_group,un_name)) {
 176                         DEBUGADD(4, ("found.\n"));
 177                         return(ret);
 178                 }
 179         }
 180         DEBUGADD(4, ("not found.\n"));
 181         return NULL;
 182 }
 183
 184 /****************************************************************************
 185   Create a workgroup in the workgroup list of the subnet.
 186 **************************************************************************/
 187
 188 struct work_record *create_workgroup_on_subnet(struct subnet_record *subrec,
 189                                                const char *name, int ttl)
 190 {
 191         struct work_record *work = NULL;
 192
 193         DEBUG(4,("create_workgroup_on_subnet: creating group %s on subnet %s\n",
 194                 name, subrec->subnet_name));
 195
 196         if ((work = create_workgroup(name, ttl))) {
 197                 add_workgroup(subrec, work);
 198                 subrec->work_changed = True;
 199                 return(work);
 200         }
 201
 202         return NULL;
 203 }
 204
 205 /****************************************************************************
 206   Update a workgroup ttl.
 207 **************************************************************************/
 208
 209 void update_workgroup_ttl(struct work_record *work, int ttl)
 210 {
 211         if(work->death_time != PERMANENT_TTL)
 212                 work->death_time = time(NULL)+(ttl*3);
 213         work->subnet->work_changed = True;
 214 }
 215
 216 /****************************************************************************
 217  Fail function called if we cannot register the WORKGROUP<0> and
 218  WORKGROUP<1e> names on the net.
 219 **************************************************************************/
 220
 221 static void fail_register(struct subnet_record *subrec, struct response_record *rrec,
 222                           struct nmb_name *nmbname)
 223 {
 224         DEBUG(0,("fail_register: Failed to register name %s on subnet %s.\n",
 225                 nmb_namestr(nmbname), subrec->subnet_name));
 226 }
 227
 228 /****************************************************************************
 229  If the workgroup is our primary workgroup, add the required names to it.
 230 **************************************************************************/
 231
 232 void initiate_myworkgroup_startup(struct subnet_record *subrec, struct work_record *work)
 233 {
 234         int i;
 235
 236         if(!strequal(lp_workgroup(), work->work_group))
 237                 return;
 238
 239         /* If this is a broadcast subnet then start elections on it if we are so configured. */
 240
 241         if ((subrec != unicast_subnet) && (subrec != remote_broadcast_subnet) &&
 242                         (subrec != wins_server_subnet) && lp_preferred_master() && lp_local_master()) {
 243                 DEBUG(3, ("initiate_myworkgroup_startup: preferred master startup for \
 244 workgroup %s on subnet %s\n", work->work_group, subrec->subnet_name));
 245                 work->needelection = True;
 246                 work->ElectionCriterion |= (1<<3);
 247         }
 248
 249         /* Register the WORKGROUP<0> and WORKGROUP<1e> names on the network. */
 250
 251         register_name(subrec,lp_workgroup(),0x0,samba_nb_type|NB_GROUP, NULL, fail_register,NULL);
 252         register_name(subrec,lp_workgroup(),0x1e,samba_nb_type|NB_GROUP, NULL, fail_register,NULL);
 253
 254         for( i = 0; my_netbios_names(i); i++) {
 255                 const char *name = my_netbios_names(i);
 256                 int stype = lp_default_server_announce() | (lp_local_master() ?  SV_TYPE_POTENTIAL_BROWSER : 0 );
 257
 258                 if(!strequal(global_myname(), name))
 259                         stype &= ~(SV_TYPE_MASTER_BROWSER|SV_TYPE_POTENTIAL_BROWSER|SV_TYPE_DOMAIN_MASTER|SV_TYPE_DOMAIN_MEMBER);
 260
 261                 create_server_on_workgroup(work,name,stype|SV_TYPE_LOCAL_LIST_ONLY, PERMANENT_TTL,
 262                                 string_truncate(lp_serverstring(), MAX_SERVER_STRING_LENGTH));
 263                 DEBUG(3,("initiate_myworkgroup_startup: Added server name entry %s \
 264 on subnet %s\n", name, subrec->subnet_name));
 265         }
 266 }
 267
 268 /****************************************************************************
 269   Dump a copy of the workgroup database into the log file.
 270   **************************************************************************/
 271
 272 void dump_workgroups(bool force_write)
 273 {
 274         struct subnet_record *subrec;
 275         int debuglevel = force_write ? 0 : 4;
 276
 277         for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec)) {
 278                 if (subrec->workgrouplist) {
 279                         struct work_record *work;
 280
 281                         if( DEBUGLVL( debuglevel ) ) {
 282                                 dbgtext( "dump_workgroups()\n " );
 283                                 dbgtext( "dump workgroup on subnet %15s: ", subrec->subnet_name );
 284                                 dbgtext( "netmask=%15s:\n", inet_ntoa(subrec->mask_ip) );
 285                         }
 286
 287                         for (work = subrec->workgrouplist; work; work = work->next) {
 288                                 DEBUGADD( debuglevel, ( "\t%s(%d) current master browser = %s\n", work->work_group,
 289                                         work->token, *work->local_master_browser_name ? work->local_master_browser_name : "UNKNOWN" ) );
 290                                 if (work->serverlist) {
 291                                         struct server_record *servrec;
 292                                         for (servrec = work->serverlist; servrec; servrec = servrec->next) {
 293                                                 DEBUGADD( debuglevel, ( "\t\t%s %8x (%s)\n",
 294                                                         servrec->serv.name,
 295                                                         servrec->serv.type,
 296                                                         servrec->serv.comment ) );
 297                                         }
 298                                 }
 299                         }
 300                 }
 301         }
 302 }
 303
 304 /****************************************************************************
 305   Expire any dead servers on all workgroups. If the workgroup has expired
 306   remove it.
 307   **************************************************************************/
 308
 309 void expire_workgroups_and_servers(time_t t)
 310 {
 311         struct subnet_record *subrec;
 312
 313         for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec)) {
 314                 struct work_record *work;
 315                 struct work_record *nextwork;
 316
 317                 for (work = subrec->workgrouplist; work; work = nextwork) {
 318                         nextwork = work->next;
 319                         expire_servers(work, t);
 320
 321                         if ((work->serverlist == NULL) && (work->death_time != PERMANENT_TTL) &&
 322                                         ((t == (time_t)-1) || (work->death_time < t))) {
 323                                 DEBUG(3,("expire_workgroups_and_servers: Removing timed out workgroup %s\n",
 324                                                 work->work_group));
 325                                 remove_workgroup_from_subnet(subrec, work);
 326                         }
 327                 }
 328         }
 329 }