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 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 #include "../librpc/gen_ndr/svcctl.h"
  25 #include "nmbd/nmbd.h"
  26
  27 extern uint16_t samba_nb_type;
  28
  29 int workgroup_count = 0; /* unique index key: one for each workgroup */
  30
  31 /****************************************************************************
  32   Add a workgroup into the list.
  33 **************************************************************************/
  34
  35 static void add_workgroup(struct subnet_record *subrec, struct work_record *work)
  36 {
  37         work->subnet = subrec;
  38         DLIST_ADD(subrec->workgrouplist, work);
  39         subrec->work_changed = True;
  40 }
  41
  42 /****************************************************************************
  43  Copy name to unstring. Used by create_workgroup() and find_workgroup_on_subnet().
  44 **************************************************************************/
  45
  46 static void name_to_unstring(unstring unname, const char *name)
  47 {
  48         nstring nname;
  49
  50         errno = 0;
  51         push_ascii_nstring(nname, name);
  52         if (errno == E2BIG) {
  53                 unstring tname;
  54                 pull_ascii_nstring(tname, sizeof(tname), nname);
  55                 strlcpy(unname, tname, sizeof(nname));
  56                 DEBUG(0,("name_to_nstring: workgroup name %s is too long. Truncating to %s\n",
  57                         name, tname));
  58         } else {
  59                 unstrcpy(unname, name);
  60         }
  61 }
  62
  63 /****************************************************************************
  64   Create an empty workgroup.
  65 **************************************************************************/
  66
  67 static struct work_record *create_workgroup(const char *name, int ttl)
  68 {
  69         struct work_record *work;
  70         struct subnet_record *subrec;
  71         int t = -1;
  72
  73         if((work = SMB_MALLOC_P(struct work_record)) == NULL) {
  74                 DEBUG(0,("create_workgroup: malloc fail !\n"));
  75                 return NULL;
  76         }
  77         memset((char *)work, '\0', sizeof(*work));
  78
  79         name_to_unstring(work->work_group, name);
  80
  81         work->serverlist = NULL;
  82
  83         work->RunningElection = False;
  84         work->ElectionCount = 0;
  85         work->announce_interval = 0;
  86         work->needelection = False;
  87         work->needannounce = True;
  88         work->lastannounce_time = time(NULL);
  89         work->mst_state = lp_local_master() ? MST_POTENTIAL : MST_NONE;
  90         work->dom_state = DOMAIN_NONE;
  91         work->log_state = LOGON_NONE;
  92
  93         work->death_time = (ttl != PERMANENT_TTL) ? time(NULL)+(ttl*3) : PERMANENT_TTL;
  94
  95         /* Make sure all token representations of workgroups are unique. */
  96
  97         for (subrec = FIRST_SUBNET; subrec && (t == -1); subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec)) {
  98                 struct work_record *w;
  99                 for (w = subrec->workgrouplist; w && t == -1; w = w->next) {
 100                         if (strequal(w->work_group, work->work_group))
 101                                 t = w->token;
 102                 }
 103         }
 104
 105         if (t == -1)
 106                 work->token = ++workgroup_count;
 107         else
 108                 work->token = t;
 109
 110         /* No known local master browser as yet. */
 111         *work->local_master_browser_name = '\0';
 112
 113         /* No known domain master browser as yet. */
 114         *work->dmb_name.name = '\0';
 115         zero_ip_v4(&work->dmb_addr);
 116
 117         /* WfWg  uses 01040b01 */
 118         /* Win95 uses 01041501 */
 119         /* NTAS  uses ???????? */
 120         work->ElectionCriterion  = (MAINTAIN_LIST)|(BROWSER_ELECTION_VERSION<<8);
 121         work->ElectionCriterion |= (lp_os_level() << 24);
 122         if (lp_domain_master())
 123                 work->ElectionCriterion |= 0x80;
 124
 125         return work;
 126 }
 127
 128 /*******************************************************************
 129   Remove a workgroup.
 130 ******************************************************************/
 131
 132 static struct work_record *remove_workgroup_from_subnet(struct subnet_record *subrec,
 133                                      struct work_record *work)
 134 {
 135         struct work_record *ret_work = NULL;
 136
 137         DEBUG(3,("remove_workgroup: Removing workgroup %s\n", work->work_group));
 138
 139         ret_work = work->next;
 140
 141         remove_all_servers(work);
 142
 143         if (!work->serverlist) {
 144                 DLIST_REMOVE(subrec->workgrouplist, work);
 145                 ZERO_STRUCTP(work);
 146                 SAFE_FREE(work);
 147         }
 148
 149         subrec->work_changed = True;
 150
 151         return ret_work;
 152 }
 153
 154 /****************************************************************************
 155   Find a workgroup in the workgroup list of a subnet.
 156 **************************************************************************/
 157
 158 struct work_record *find_workgroup_on_subnet(struct subnet_record *subrec,
 159                                              const char *name)
 160 {
 161         struct work_record *ret;
 162         unstring un_name;
 163
 164         DEBUG(4, ("find_workgroup_on_subnet: workgroup search for %s on subnet %s: ",
 165                 name, subrec->subnet_name));
 166
 167         name_to_unstring(un_name, name);
 168
 169         for (ret = subrec->workgrouplist; ret; ret = ret->next) {
 170                 if (strequal(ret->work_group,un_name)) {
 171                         DEBUGADD(4, ("found.\n"));
 172                         return(ret);
 173                 }
 174         }
 175         DEBUGADD(4, ("not found.\n"));
 176         return NULL;
 177 }
 178
 179 /****************************************************************************
 180   Create a workgroup in the workgroup list of the subnet.
 181 **************************************************************************/
 182
 183 struct work_record *create_workgroup_on_subnet(struct subnet_record *subrec,
 184                                                const char *name, int ttl)
 185 {
 186         struct work_record *work = NULL;
 187
 188         DEBUG(4,("create_workgroup_on_subnet: creating group %s on subnet %s\n",
 189                 name, subrec->subnet_name));
 190
 191         if ((work = create_workgroup(name, ttl))) {
 192                 add_workgroup(subrec, work);
 193                 subrec->work_changed = True;
 194                 return(work);
 195         }
 196
 197         return NULL;
 198 }
 199
 200 /****************************************************************************
 201   Update a workgroup ttl.
 202 **************************************************************************/
 203
 204 void update_workgroup_ttl(struct work_record *work, int ttl)
 205 {
 206         if(work->death_time != PERMANENT_TTL)
 207                 work->death_time = time(NULL)+(ttl*3);
 208         work->subnet->work_changed = True;
 209 }
 210
 211 /****************************************************************************
 212  Fail function called if we cannot register the WORKGROUP<0> and
 213  WORKGROUP<1e> names on the net.
 214 **************************************************************************/
 215
 216 static void fail_register(struct subnet_record *subrec, struct response_record *rrec,
 217                           struct nmb_name *nmbname)
 218 {
 219         DEBUG(0,("fail_register: Failed to register name %s on subnet %s.\n",
 220                 nmb_namestr(nmbname), subrec->subnet_name));
 221 }
 222
 223 /****************************************************************************
 224  If the workgroup is our primary workgroup, add the required names to it.
 225 **************************************************************************/
 226
 227 void initiate_myworkgroup_startup(struct subnet_record *subrec, struct work_record *work)
 228 {
 229         int i;
 230
 231         if(!strequal(lp_workgroup(), work->work_group))
 232                 return;
 233
 234         /* If this is a broadcast subnet then start elections on it if we are so configured. */
 235
 236         if ((subrec != unicast_subnet) && (subrec != remote_broadcast_subnet) &&
 237                         (subrec != wins_server_subnet) && lp_preferred_master() && lp_local_master()) {
 238                 DEBUG(3, ("initiate_myworkgroup_startup: preferred master startup for \
 239 workgroup %s on subnet %s\n", work->work_group, subrec->subnet_name));
 240                 work->needelection = True;
 241                 work->ElectionCriterion |= (1<<3);
 242         }
 243
 244         /* Register the WORKGROUP<0> and WORKGROUP<1e> names on the network. */
 245
 246         register_name(subrec,lp_workgroup(),0x0,samba_nb_type|NB_GROUP, NULL, fail_register,NULL);
 247         register_name(subrec,lp_workgroup(),0x1e,samba_nb_type|NB_GROUP, NULL, fail_register,NULL);
 248
 249         for( i = 0; my_netbios_names(i); i++) {
 250                 const char *name = my_netbios_names(i);
 251                 int stype = lp_default_server_announce() | (lp_local_master() ?  SV_TYPE_POTENTIAL_BROWSER : 0 );
 252
 253                 if(!strequal(lp_netbios_name(), name))
 254                         stype &= ~(SV_TYPE_MASTER_BROWSER|SV_TYPE_POTENTIAL_BROWSER|SV_TYPE_DOMAIN_MASTER|SV_TYPE_DOMAIN_MEMBER);
 255
 256                 create_server_on_workgroup(work,name,stype|SV_TYPE_LOCAL_LIST_ONLY, PERMANENT_TTL,
 257                                 string_truncate(lp_server_string(talloc_tos()), MAX_SERVER_STRING_LENGTH));
 258                 DEBUG(3,("initiate_myworkgroup_startup: Added server name entry %s \
 259 on subnet %s\n", name, subrec->subnet_name));
 260         }
 261 }
 262
 263 /****************************************************************************
 264   Dump a copy of the workgroup database into the log file.
 265   **************************************************************************/
 266
 267 void dump_workgroups(bool force_write)
 268 {
 269         struct subnet_record *subrec;
 270         int debuglevel = force_write ? 0 : 4;
 271
 272         for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec)) {
 273                 if (subrec->workgrouplist) {
 274                         struct work_record *work;
 275
 276                         if( DEBUGLVL( debuglevel ) ) {
 277                                 dbgtext( "dump_workgroups()\n " );
 278                                 dbgtext( "dump workgroup on subnet %15s: ", subrec->subnet_name );
 279                                 dbgtext( "netmask=%15s:\n", inet_ntoa(subrec->mask_ip) );
 280                         }
 281
 282                         for (work = subrec->workgrouplist; work; work = work->next) {
 283                                 DEBUGADD( debuglevel, ( "\t%s(%d) current master browser = %s\n", work->work_group,
 284                                         work->token, *work->local_master_browser_name ? work->local_master_browser_name : "UNKNOWN" ) );
 285                                 if (work->serverlist) {
 286                                         struct server_record *servrec;
 287                                         for (servrec = work->serverlist; servrec; servrec = servrec->next) {
 288                                                 DEBUGADD( debuglevel, ( "\t\t%s %8x (%s)\n",
 289                                                         servrec->serv.name,
 290                                                         servrec->serv.type,
 291                                                         servrec->serv.comment ) );
 292                                         }
 293                                 }
 294                         }
 295                 }
 296         }
 297 }
 298
 299 /****************************************************************************
 300   Expire any dead servers on all workgroups. If the workgroup has expired
 301   remove it.
 302   **************************************************************************/
 303
 304 void expire_workgroups_and_servers(time_t t)
 305 {
 306         struct subnet_record *subrec;
 307
 308         for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec)) {
 309                 struct work_record *work;
 310                 struct work_record *nextwork;
 311
 312                 for (work = subrec->workgrouplist; work; work = nextwork) {
 313                         nextwork = work->next;
 314                         expire_servers(work, t);
 315
 316                         if ((work->serverlist == NULL) && (work->death_time != PERMANENT_TTL) &&
 317                                         ((t == (time_t)-1) || (work->death_time < t))) {
 318                                 DEBUG(3,("expire_workgroups_and_servers: Removing timed out workgroup %s\n",
 319                                                 work->work_group));
 320                                 remove_workgroup_from_subnet(subrec, work);
 321                         }
 322                 }
 323         }
 324 }