source3/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 int ClientNMB;
  27
  28 extern uint16 samba_nb_type;
  29
  30 int workgroup_count = 0; /* unique index key: one for each workgroup */
  31
  32 /****************************************************************************
  33   Add a workgroup into the list.
  34 **************************************************************************/
  35
  36 static void add_workgroup(struct subnet_record *subrec, struct work_record *work)
  37 {
  38         work->subnet = subrec;
  39         DLIST_ADD(subrec->workgrouplist, work);
  40         subrec->work_changed = True;
  41 }
  42
  43 /****************************************************************************
  44   Create an empty workgroup.
  45 **************************************************************************/
  46
  47 static struct work_record *create_workgroup(const char *name, int ttl)
  48 {
  49         struct work_record *work;
  50         struct subnet_record *subrec;
  51         int t = -1;
  52
  53         if((work = (struct work_record *)malloc(sizeof(*work))) == NULL) {
  54                 DEBUG(0,("create_workgroup: malloc fail !\n"));
  55                 return NULL;
  56         }
  57         memset((char *)work, '\0', sizeof(*work));
  58
  59         nstrcpy(work->work_group,name);
  60         work->serverlist = NULL;
  61
  62         work->RunningElection = False;
  63         work->ElectionCount = 0;
  64         work->announce_interval = 0;
  65         work->needelection = False;
  66         work->needannounce = True;
  67         work->lastannounce_time = time(NULL);
  68         work->mst_state = lp_local_master() ? MST_POTENTIAL : MST_NONE;
  69         work->dom_state = DOMAIN_NONE;
  70         work->log_state = LOGON_NONE;
  71
  72         work->death_time = (ttl != PERMANENT_TTL) ? time(NULL)+(ttl*3) : PERMANENT_TTL;
  73
  74         /* Make sure all token representations of workgroups are unique. */
  75
  76         for (subrec = FIRST_SUBNET; subrec && (t == -1); subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec)) {
  77                 struct work_record *w;
  78                 for (w = subrec->workgrouplist; w && t == -1; w = w->next) {
  79                         if (strnequal(w->work_group, work->work_group, sizeof(nstring)))
  80                                 t = w->token;
  81                 }
  82         }
  83
  84         if (t == -1)
  85                 work->token = ++workgroup_count;
  86         else
  87                 work->token = t;
  88
  89         /* No known local master browser as yet. */
  90         *work->local_master_browser_name = '\0';
  91
  92         /* No known domain master browser as yet. */
  93         *work->dmb_name.name = '\0';
  94         zero_ip(&work->dmb_addr);
  95
  96         /* WfWg  uses 01040b01 */
  97         /* Win95 uses 01041501 */
  98         /* NTAS  uses ???????? */
  99         work->ElectionCriterion  = (MAINTAIN_LIST)|(BROWSER_ELECTION_VERSION<<8);
 100         work->ElectionCriterion |= (lp_os_level() << 24);
 101         if (lp_domain_master())
 102                 work->ElectionCriterion |= 0x80;
 103
 104         return work;
 105 }
 106
 107 /*******************************************************************
 108   Remove a workgroup.
 109 ******************************************************************/
 110
 111 static struct work_record *remove_workgroup_from_subnet(struct subnet_record *subrec,
 112                                      struct work_record *work)
 113 {
 114         struct work_record *ret_work = NULL;
 115
 116         DEBUG(3,("remove_workgroup: Removing workgroup %s\n", work->work_group));
 117
 118         ret_work = work->next;
 119
 120         remove_all_servers(work);
 121
 122         if (!work->serverlist) {
 123                 if (work->prev)
 124                         work->prev->next = work->next;
 125                 if (work->next)
 126                         work->next->prev = work->prev;
 127
 128                 if (subrec->workgrouplist == work)
 129                         subrec->workgrouplist = work->next;
 130
 131                 ZERO_STRUCTP(work);
 132                 SAFE_FREE(work);
 133         }
 134
 135         subrec->work_changed = True;
 136
 137         return ret_work;
 138 }
 139
 140 /****************************************************************************
 141   Find a workgroup in the workgroup list of a subnet.
 142 **************************************************************************/
 143
 144 struct work_record *find_workgroup_on_subnet(struct subnet_record *subrec,
 145                                              const char *name)
 146 {
 147         struct work_record *ret;
 148
 149         DEBUG(4, ("find_workgroup_on_subnet: workgroup search for %s on subnet %s: ",
 150                 name, subrec->subnet_name));
 151
 152         for (ret = subrec->workgrouplist; ret; ret = ret->next) {
 153                 if (strnequal(ret->work_group,name,sizeof(nstring))) {
 154                         DEBUGADD(4, ("found.\n"));
 155                         return(ret);
 156                 }
 157         }
 158         DEBUGADD(4, ("not found.\n"));
 159         return NULL;
 160 }
 161
 162 /****************************************************************************
 163   Create a workgroup in the workgroup list of the subnet.
 164 **************************************************************************/
 165
 166 struct work_record *create_workgroup_on_subnet(struct subnet_record *subrec,
 167                                                const char *name, int ttl)
 168 {
 169         struct work_record *work = NULL;
 170
 171         DEBUG(4,("create_workgroup_on_subnet: creating group %s on subnet %s\n",
 172                 name, subrec->subnet_name));
 173
 174         if ((work = create_workgroup(name, ttl))) {
 175                 add_workgroup(subrec, work);
 176                 subrec->work_changed = True;
 177                 return(work);
 178         }
 179
 180         return NULL;
 181 }
 182
 183 /****************************************************************************
 184   Update a workgroup ttl.
 185 **************************************************************************/
 186
 187 void update_workgroup_ttl(struct work_record *work, int ttl)
 188 {
 189         if(work->death_time != PERMANENT_TTL)
 190                 work->death_time = time(NULL)+(ttl*3);
 191         work->subnet->work_changed = True;
 192 }
 193
 194 /****************************************************************************
 195  Fail function called if we cannot register the WORKGROUP<0> and
 196  WORKGROUP<1e> names on the net.
 197 **************************************************************************/
 198
 199 static void fail_register(struct subnet_record *subrec, struct response_record *rrec,
 200                           struct nmb_name *nmbname)
 201 {
 202         DEBUG(0,("fail_register: Failed to register name %s on subnet %s.\n",
 203                 nmb_namestr(nmbname), subrec->subnet_name));
 204 }
 205
 206 /****************************************************************************
 207  If the workgroup is our primary workgroup, add the required names to it.
 208 **************************************************************************/
 209
 210 void initiate_myworkgroup_startup(struct subnet_record *subrec, struct work_record *work)
 211 {
 212         int i;
 213
 214         if(!strnequal(lp_workgroup(), work->work_group,sizeof(nstring)))
 215                 return;
 216
 217         /* If this is a broadcast subnet then start elections on it if we are so configured. */
 218
 219         if ((subrec != unicast_subnet) && (subrec != remote_broadcast_subnet) &&
 220                         (subrec != wins_server_subnet) && lp_preferred_master() && lp_local_master()) {
 221                 DEBUG(3, ("initiate_myworkgroup_startup: preferred master startup for \
 222 workgroup %s on subnet %s\n", work->work_group, subrec->subnet_name));
 223                 work->needelection = True;
 224                 work->ElectionCriterion |= (1<<3);
 225         }
 226
 227         /* Register the WORKGROUP<0> and WORKGROUP<1e> names on the network. */
 228
 229         register_name(subrec,lp_workgroup(),0x0,samba_nb_type|NB_GROUP, NULL, fail_register,NULL);
 230         register_name(subrec,lp_workgroup(),0x1e,samba_nb_type|NB_GROUP, NULL, fail_register,NULL);
 231
 232         for( i = 0; my_netbios_names(i); i++) {
 233                 const char *name = my_netbios_names(i);
 234                 int stype = lp_default_server_announce() | (lp_local_master() ?  SV_TYPE_POTENTIAL_BROWSER : 0 );
 235
 236                 if(!strequal(global_myname(), name))
 237                         stype &= ~(SV_TYPE_MASTER_BROWSER|SV_TYPE_POTENTIAL_BROWSER|SV_TYPE_DOMAIN_MASTER|SV_TYPE_DOMAIN_MEMBER);
 238
 239                 create_server_on_workgroup(work,name,stype|SV_TYPE_LOCAL_LIST_ONLY, PERMANENT_TTL,
 240                                 string_truncate(lp_serverstring(), MAX_SERVER_STRING_LENGTH));
 241                 DEBUG(3,("initiate_myworkgroup_startup: Added server name entry %s \
 242 on subnet %s\n", name, subrec->subnet_name));
 243         }
 244 }
 245
 246 /****************************************************************************
 247   Dump a copy of the workgroup database into the log file.
 248   **************************************************************************/
 249
 250 void dump_workgroups(BOOL force_write)
 251 {
 252         struct subnet_record *subrec;
 253         int debuglevel = force_write ? 0 : 4;
 254
 255         for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec)) {
 256                 if (subrec->workgrouplist) {
 257                         struct work_record *work;
 258
 259                         if( DEBUGLVL( debuglevel ) ) {
 260                                 dbgtext( "dump_workgroups()\n " );
 261                                 dbgtext( "dump workgroup on subnet %15s: ", subrec->subnet_name );
 262                                 dbgtext( "netmask=%15s:\n", inet_ntoa(subrec->mask_ip) );
 263                         }
 264
 265                         for (work = subrec->workgrouplist; work; work = work->next) {
 266                                 DEBUGADD( debuglevel, ( "\t%s(%d) current master browser = %s\n", work->work_group,
 267                                         work->token, *work->local_master_browser_name ? work->local_master_browser_name : "UNKNOWN" ) );
 268                                 if (work->serverlist) {
 269                                         struct server_record *servrec;
 270                                         for (servrec = work->serverlist; servrec; servrec = servrec->next) {
 271                                                 DEBUGADD( debuglevel, ( "\t\t%s %8x (%s)\n",
 272                                                         servrec->serv.name,
 273                                                         servrec->serv.type,
 274                                                         servrec->serv.comment ) );
 275                                         }
 276                                 }
 277                         }
 278                 }
 279         }
 280 }
 281
 282 /****************************************************************************
 283   Expire any dead servers on all workgroups. If the workgroup has expired
 284   remove it.
 285   **************************************************************************/
 286
 287 void expire_workgroups_and_servers(time_t t)
 288 {
 289         struct subnet_record *subrec;
 290
 291         for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec)) {
 292                 struct work_record *work;
 293                 struct work_record *nextwork;
 294
 295                 for (work = subrec->workgrouplist; work; work = nextwork) {
 296                         nextwork = work->next;
 297                         expire_servers(work, t);
 298
 299                         if ((work->serverlist == NULL) && (work->death_time != PERMANENT_TTL) &&
 300                                         ((t == -1) || (work->death_time < t))) {
 301                                 DEBUG(3,("expire_workgroups_and_servers: Removing timed out workgroup %s\n",
 302                                                 work->work_group));
 303                                 remove_workgroup_from_subnet(subrec, work);
 304                         }
 305                 }
 306         }
 307 }