source3/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 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 "nmbd/nmbd.h"
  25
  26 extern uint16_t 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_t 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                 unstring name;
  97                 pull_ascii_nstring(name, sizeof(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         const char **cluster_addresses = NULL;
 119
 120         for(subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec)) {
 121                 register_my_workgroup_one_subnet(subrec);
 122         }
 123
 124         /* We still need to add the magic Samba
 125                 names and the netbios names to the unicast subnet directly. This is
 126                 to allow unicast node status requests and queries to still work
 127                 in a broadcast only environment. */
 128
 129         add_samba_names_to_subnet(unicast_subnet);
 130
 131         for (i=0; my_netbios_names(i); i++) {
 132                 for(subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) {
 133                         /*
 134                          * Ensure all the IP addresses are added if we are multihomed.
 135                          */
 136                         struct nmb_name nmbname;
 137
 138                         make_nmb_name(&nmbname, my_netbios_names(i),0x20);
 139                         insert_refresh_name_into_unicast(subrec, &nmbname, samba_nb_type);
 140
 141                         make_nmb_name(&nmbname, my_netbios_names(i),0x3);
 142                         insert_refresh_name_into_unicast(subrec, &nmbname, samba_nb_type);
 143
 144                         make_nmb_name(&nmbname, my_netbios_names(i),0x0);
 145                         insert_refresh_name_into_unicast(subrec, &nmbname, samba_nb_type);
 146                 }
 147         }
 148
 149         /*
 150          * add in any cluster addresses. We need to response to these,
 151          * but not listen on them. This allows us to run nmbd on every
 152          * node in the cluster, and have all of them register with a
 153          * WINS server correctly
 154          */
 155         if (lp_clustering()) {
 156                 cluster_addresses = lp_cluster_addresses();
 157         }
 158         if (cluster_addresses) {
 159                 int a, n;
 160                 unsigned name_types[] = {0x20, 0x3, 0x0};
 161
 162                 for (i=0; my_netbios_names(i); i++) {
 163                         for(subrec = FIRST_SUBNET; subrec; subrec = subrec->next) {
 164                                 for (n=0;n<ARRAY_SIZE(name_types);n++) {
 165                                         struct name_record *namerec;
 166                                         struct nmb_name nmbname;
 167                                         struct in_addr ip;
 168                                         make_nmb_name(&nmbname, my_netbios_names(i), name_types[n]);
 169                                         namerec = find_name_on_subnet(unicast_subnet, &nmbname, FIND_SELF_NAME);
 170                                         if (namerec == NULL) continue;
 171                                         for (a=0;cluster_addresses[a];a++) {
 172                                                 ip = interpret_addr2(cluster_addresses[a]);
 173                                                 add_ip_to_name_record(namerec, ip);
 174                                         }
 175                                 }
 176                         }
 177                 }
 178         }
 179
 180         /*
 181          * Add the WORKGROUP<0> and WORKGROUP<1e> group names to the unicast subnet
 182          * also for the same reasons.
 183          */
 184
 185         for(subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) {
 186                 /*
 187                  * Ensure all the IP addresses are added if we are multihomed.
 188                  */
 189                 struct nmb_name nmbname;
 190
 191                 make_nmb_name(&nmbname, lp_workgroup(), 0x0);
 192                 insert_refresh_name_into_unicast(subrec, &nmbname, samba_nb_type|NB_GROUP);
 193
 194                 make_nmb_name(&nmbname, lp_workgroup(), 0x1e);
 195                 insert_refresh_name_into_unicast(subrec, &nmbname, samba_nb_type|NB_GROUP);
 196         }
 197
 198         /*
 199          * We need to add the Samba names to the remote broadcast subnet,
 200          * as NT 4.x does directed broadcast requests to the *<0x0> name.
 201          */
 202
 203         add_samba_names_to_subnet(remote_broadcast_subnet);
 204
 205         return True;
 206 }
 207
 208 /****************************************************************************
 209   Remove all the names we registered.
 210 **************************************************************************/
 211
 212 void release_wins_names(void)
 213 {
 214         struct subnet_record *subrec = unicast_subnet;
 215         struct name_record *namerec, *nextnamerec;
 216
 217         for (namerec = subrec->namelist; namerec; namerec = nextnamerec) {
 218                 nextnamerec = namerec->next;
 219                 if( (namerec->data.source == SELF_NAME)
 220                     && !NAME_IS_DEREGISTERING(namerec) )
 221                         release_name( subrec, namerec, standard_success_release,
 222                                       NULL, NULL);
 223         }
 224 }
 225
 226 /*******************************************************************
 227   Refresh our registered names with WINS
 228 ******************************************************************/
 229
 230 void refresh_my_names(time_t t)
 231 {
 232         struct name_record *namerec;
 233
 234         if (wins_srv_count() < 1)
 235                 return;
 236
 237         for (namerec = unicast_subnet->namelist; namerec; namerec = namerec->next) {
 238                 /* Each SELF name has an individual time to be refreshed. */
 239                 if ((namerec->data.source == SELF_NAME) &&
 240                     (namerec->data.refresh_time < t) &&
 241                     (namerec->data.death_time != PERMANENT_TTL)) {
 242                         /* We cheat here and pretend the refresh is going to be
 243                            successful & update the refresh times. This stops
 244                            multiple refresh calls being done. We actually
 245                            deal with refresh failure in the fail_fn.
 246                         */
 247                         if (!is_refresh_already_queued(unicast_subnet, namerec)) {
 248                                 wins_refresh_name(namerec);
 249                         }
 250                         namerec->data.death_time = t + lp_max_ttl();
 251                         namerec->data.refresh_time = t + MIN(lp_max_ttl()/2, MAX_REFRESH_TIME);
 252                 }
 253         }
 254 }