source/nmbd/nmbd_mynames.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 1994-2003
   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; /* Samba's NetBIOS type. */
  27
  28 /****************************************************************************
  29  Fail funtion when registering my netbios names.
  30 **************************************************************************/
  31
  32 static void my_name_register_failed(struct subnet_record *subrec,
  33                               struct response_record *rrec, struct nmb_name *nmbname)
  34 {
  35         DEBUG(0,("my_name_register_failed: Failed to register my name %s on subnet %s.\n",
  36                 nmb_namestr(nmbname), subrec->subnet_name));
  37 }
  38
  39
  40 /****************************************************************************
  41   Add my workgroup and my given names to one subnet
  42   Also add the magic Samba names.
  43 **************************************************************************/
  44
  45 void register_my_workgroup_one_subnet(struct subnet_record *subrec)
  46 {
  47         int i;
  48
  49         struct work_record *work;
  50
  51         /* Create the workgroup on the subnet. */
  52         if((work = create_workgroup_on_subnet(subrec, lp_workgroup(),
  53                                               PERMANENT_TTL)) == NULL) {
  54                 DEBUG(0,("register_my_workgroup_and_names: Failed to create my workgroup %s on subnet %s. \
  55 Exiting.\n", lp_workgroup(), subrec->subnet_name));
  56                 return;
  57         }
  58
  59         /* Each subnet entry, except for the wins_server_subnet has
  60            the magic Samba names. */
  61         add_samba_names_to_subnet(subrec);
  62
  63         /* Register all our names including aliases. */
  64         for (i=0; my_netbios_names(i); i++) {
  65                 register_name(subrec, my_netbios_names(i),0x20,samba_nb_type,
  66                               NULL,
  67                               my_name_register_failed, NULL);
  68                 register_name(subrec, my_netbios_names(i),0x03,samba_nb_type,
  69                               NULL,
  70                               my_name_register_failed, NULL);
  71                 register_name(subrec, my_netbios_names(i),0x00,samba_nb_type,
  72                               NULL,
  73                               my_name_register_failed, NULL);
  74         }
  75
  76         /* Initiate election processing, register the workgroup names etc. */
  77         initiate_myworkgroup_startup(subrec, work);
  78 }
  79
  80 /*******************************************************************
  81  Utility function to add a name to the unicast subnet, or add in
  82  our IP address if it already exists.
  83 ******************************************************************/
  84
  85 static void insert_refresh_name_into_unicast( struct subnet_record *subrec,
  86                                                 struct nmb_name *nmbname, uint16 nb_type )
  87 {
  88         struct name_record *namerec;
  89
  90         if (!we_are_a_wins_client()) {
  91                 insert_permanent_name_into_unicast(subrec, nmbname, nb_type);
  92                 return;
  93         }
  94
  95         if((namerec = find_name_on_subnet(unicast_subnet, nmbname, FIND_SELF_NAME)) == NULL) {
  96                 nstring name;
  97                 pull_ascii_nstring(name, nmbname->name);
  98                 /* The name needs to be created on the unicast subnet. */
  99                 (void)add_name_to_subnet( unicast_subnet, name,
 100                                 nmbname->name_type, nb_type,
 101                                 MIN(lp_max_ttl(), MAX_REFRESH_TIME), SELF_NAME, 1, &subrec->myip);
 102         } else {
 103                 /* The name already exists on the unicast subnet. Add our local
 104                         IP for the given broadcast subnet to the name. */
 105                 add_ip_to_name_record( namerec, subrec->myip);
 106         }
 107 }
 108
 109 /****************************************************************************
 110   Add my workgroup and my given names to the subnet lists.
 111   Also add the magic Samba names.
 112 **************************************************************************/
 113
 114 BOOL register_my_workgroup_and_names(void)
 115 {
 116         struct subnet_record *subrec;
 117         int i;
 118
 119         for(subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec)) {
 120                 register_my_workgroup_one_subnet(subrec);
 121         }
 122
 123         /* We still need to add the magic Samba
 124                 names and the netbios names to the unicast subnet directly. This is
 125                 to allow unicast node status requests and queries to still work
 126                 in a broadcast only environment. */
 127
 128         add_samba_names_to_subnet(unicast_subnet);
 129
 130         for (i=0; my_netbios_names(i); i++) {
 131                 for(subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) {
 132                         /*
 133                          * Ensure all the IP addresses are added if we are multihomed.
 134                          */
 135                         struct nmb_name nmbname;
 136
 137                         make_nmb_name(&nmbname, my_netbios_names(i),0x20);
 138                         insert_refresh_name_into_unicast(subrec, &nmbname, samba_nb_type);
 139
 140                         make_nmb_name(&nmbname, my_netbios_names(i),0x3);
 141                         insert_refresh_name_into_unicast(subrec, &nmbname, samba_nb_type);
 142
 143                         make_nmb_name(&nmbname, my_netbios_names(i),0x0);
 144                         insert_refresh_name_into_unicast(subrec, &nmbname, samba_nb_type);
 145                 }
 146         }
 147
 148         /*
 149          * Add the WORKGROUP<0> and WORKGROUP<1e> group names to the unicast subnet
 150          * also for the same reasons.
 151          */
 152
 153         for(subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) {
 154                 /*
 155                  * Ensure all the IP addresses are added if we are multihomed.
 156                  */
 157                 struct nmb_name nmbname;
 158
 159                 make_nmb_name(&nmbname, lp_workgroup(), 0x0);
 160                 insert_refresh_name_into_unicast(subrec, &nmbname, samba_nb_type|NB_GROUP);
 161
 162                 make_nmb_name(&nmbname, lp_workgroup(), 0x1e);
 163                 insert_refresh_name_into_unicast(subrec, &nmbname, samba_nb_type|NB_GROUP);
 164         }
 165
 166         /*
 167          * We need to add the Samba names to the remote broadcast subnet,
 168          * as NT 4.x does directed broadcast requests to the *<0x0> name.
 169          */
 170
 171         add_samba_names_to_subnet(remote_broadcast_subnet);
 172
 173         return True;
 174 }
 175
 176 /****************************************************************************
 177   Remove all the names we registered.
 178 **************************************************************************/
 179
 180 void release_wins_names(void)
 181 {
 182         struct subnet_record *subrec = unicast_subnet;
 183         struct name_record *namerec, *nextnamerec;
 184
 185         for (namerec = (struct name_record *)ubi_trFirst( subrec->namelist ); namerec; namerec = nextnamerec) {
 186                 nextnamerec = (struct name_record *)ubi_trNext( namerec );
 187                 if( (namerec->data.source == SELF_NAME)
 188                     && !NAME_IS_DEREGISTERING(namerec) )
 189                         release_name( subrec, namerec, standard_success_release,
 190                                       NULL, NULL);
 191         }
 192 }
 193
 194 /*******************************************************************
 195   Refresh our registered names with WINS
 196 ******************************************************************/
 197
 198 void refresh_my_names(time_t t)
 199 {
 200         struct name_record *namerec;
 201
 202         if (wins_srv_count() < 1)
 203                 return;
 204
 205         for (namerec = (struct name_record *)ubi_trFirst(unicast_subnet->namelist);
 206              namerec;
 207              namerec = (struct name_record *)ubi_trNext(namerec)) {
 208                 /* Each SELF name has an individual time to be refreshed. */
 209                 if ((namerec->data.source == SELF_NAME) &&
 210                     (namerec->data.refresh_time < t) &&
 211                     (namerec->data.death_time != PERMANENT_TTL)) {
 212                         /* We cheat here and pretend the refresh is going to be
 213                            successful & update the refresh times. This stops
 214                            multiple refresh calls being done. We actually
 215                            deal with refresh failure in the fail_fn.
 216                         */
 217                         if (!is_refresh_already_queued(unicast_subnet, namerec)) {
 218                                 wins_refresh_name(namerec);
 219                         }
 220                         namerec->data.death_time = t + lp_max_ttl();
 221                         namerec->data.refresh_time = t + MIN(lp_max_ttl()/2, MAX_REFRESH_TIME);
 222                 }
 223         }
 224 }