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 25extern uint16 samba_nb_type; /* Samba's NetBIOS type. */ 26 27/**************************************************************************** 28 Fail funtion when registering my netbios names. 29**************************************************************************/ 30 31static void my_name_register_failed(struct subnet_record *subrec, 32 struct response_record *rrec, struct nmb_name *nmbname) 33{ 34 DEBUG(0,("my_name_register_failed: Failed to register my name %s on subnet %s.\n", 35 nmb_namestr(nmbname), subrec->subnet_name)); 36} 37 38 39/**************************************************************************** 40 Add my workgroup and my given names to one subnet 41 Also add the magic Samba names. 42**************************************************************************/ 43 44void register_my_workgroup_one_subnet(struct subnet_record *subrec) 45{ 46 int i; 47 48 struct work_record *work; 49 50 /* Create the workgroup on the subnet. */ 51 if((work = create_workgroup_on_subnet(subrec, lp_workgroup(), 52 PERMANENT_TTL)) == NULL) { 53 DEBUG(0,("register_my_workgroup_and_names: Failed to create my workgroup %s on subnet %s. \ 54Exiting.\n", lp_workgroup(), subrec->subnet_name)); 55 return; 56 } 57 58 /* Each subnet entry, except for the wins_server_subnet has 59 the magic Samba names. */ 60 add_samba_names_to_subnet(subrec); 61 62 /* Register all our names including aliases. */ 63 for (i=0; my_netbios_names(i); i++) { 64 register_name(subrec, my_netbios_names(i),0x20,samba_nb_type, 65 NULL, 66 my_name_register_failed, NULL); 67 register_name(subrec, my_netbios_names(i),0x03,samba_nb_type, 68 NULL, 69 my_name_register_failed, NULL); 70 register_name(subrec, my_netbios_names(i),0x00,samba_nb_type, 71 NULL, 72 my_name_register_failed, NULL); 73 } 74 75 /* Initiate election processing, register the workgroup names etc. */ 76 initiate_myworkgroup_startup(subrec, work); 77} 78 79/******************************************************************* 80 Utility function to add a name to the unicast subnet, or add in 81 our IP address if it already exists. 82******************************************************************/ 83 84static void insert_refresh_name_into_unicast( struct subnet_record *subrec, 85 struct nmb_name *nmbname, uint16 nb_type ) 86{ 87 struct name_record *namerec; 88 89 if (!we_are_a_wins_client()) { 90 insert_permanent_name_into_unicast(subrec, nmbname, nb_type); 91 return; 92 } 93 94 if((namerec = find_name_on_subnet(unicast_subnet, nmbname, FIND_SELF_NAME)) == NULL) { 95 unstring name; 96 pull_ascii_nstring(name, sizeof(name), nmbname->name); 97 /* The name needs to be created on the unicast subnet. */ 98 (void)add_name_to_subnet( unicast_subnet, name, 99 nmbname->name_type, nb_type, 100 MIN(lp_max_ttl(), MAX_REFRESH_TIME), SELF_NAME, 1, &subrec->myip); 101 } else { 102 /* The name already exists on the unicast subnet. Add our local 103 IP for the given broadcast subnet to the name. */ 104 add_ip_to_name_record( namerec, subrec->myip); 105 } 106} 107 108/**************************************************************************** 109 Add my workgroup and my given names to the subnet lists. 110 Also add the magic Samba names. 111**************************************************************************/ 112 113bool register_my_workgroup_and_names(void) 114{ 115 struct subnet_record *subrec; 116 int i; 117 const char **cluster_addresses = NULL; 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 in any cluster addresses. We need to response to these, 150 * but not listen on them. This allows us to run nmbd on every 151 * node in the cluster, and have all of them register with a 152 * WINS server correctly 153 */ 154 if (lp_clustering()) { 155 cluster_addresses = lp_cluster_addresses(); 156 } 157 if (cluster_addresses) { 158 int a, n; 159 unsigned name_types[] = {0x20, 0x3, 0x0}; 160 161 for (i=0; my_netbios_names(i); i++) { 162 for(subrec = FIRST_SUBNET; subrec; subrec = subrec->next) { 163 for (n=0;n<ARRAY_SIZE(name_types);n++) { 164 struct name_record *namerec; 165 struct nmb_name nmbname; 166 struct in_addr ip; 167 make_nmb_name(&nmbname, my_netbios_names(i), name_types[n]); 168 namerec = find_name_on_subnet(unicast_subnet, &nmbname, FIND_SELF_NAME); 169 if (namerec == NULL) continue; 170 for (a=0;cluster_addresses[a];a++) { 171 ip = interpret_addr2(cluster_addresses[a]); 172 add_ip_to_name_record(namerec, ip); 173 } 174 } 175 } 176 } 177 } 178 179 /* 180 * Add the WORKGROUP<0> and WORKGROUP<1e> group names to the unicast subnet 181 * also for the same reasons. 182 */ 183 184 for(subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) { 185 /* 186 * Ensure all the IP addresses are added if we are multihomed. 187 */ 188 struct nmb_name nmbname; 189 190 make_nmb_name(&nmbname, lp_workgroup(), 0x0); 191 insert_refresh_name_into_unicast(subrec, &nmbname, samba_nb_type|NB_GROUP); 192 193 make_nmb_name(&nmbname, lp_workgroup(), 0x1e); 194 insert_refresh_name_into_unicast(subrec, &nmbname, samba_nb_type|NB_GROUP); 195 } 196 197 /* 198 * We need to add the Samba names to the remote broadcast subnet, 199 * as NT 4.x does directed broadcast requests to the *<0x0> name. 200 */ 201 202 add_samba_names_to_subnet(remote_broadcast_subnet); 203 204 return True; 205} 206 207/**************************************************************************** 208 Remove all the names we registered. 209**************************************************************************/ 210 211void release_wins_names(void) 212{ 213 struct subnet_record *subrec = unicast_subnet; 214 struct name_record *namerec, *nextnamerec; 215 216 for (namerec = subrec->namelist; namerec; namerec = nextnamerec) { 217 nextnamerec = namerec->next; 218 if( (namerec->data.source == SELF_NAME) 219 && !NAME_IS_DEREGISTERING(namerec) ) 220 release_name( subrec, namerec, standard_success_release, 221 NULL, NULL); 222 } 223} 224 225/******************************************************************* 226 Refresh our registered names with WINS 227******************************************************************/ 228 229void refresh_my_names(time_t t) 230{ 231 struct name_record *namerec; 232 233 if (wins_srv_count() < 1) 234 return; 235 236 for (namerec = unicast_subnet->namelist; namerec; namerec = namerec->next) { 237 /* Each SELF name has an individual time to be refreshed. */ 238 if ((namerec->data.source == SELF_NAME) && 239 (namerec->data.refresh_time < t) && 240 (namerec->data.death_time != PERMANENT_TTL)) { 241 /* We cheat here and pretend the refresh is going to be 242 successful & update the refresh times. This stops 243 multiple refresh calls being done. We actually 244 deal with refresh failure in the fail_fn. 245 */ 246 if (!is_refresh_already_queued(unicast_subnet, namerec)) { 247 wins_refresh_name(namerec); 248 } 249 namerec->data.death_time = t + lp_max_ttl(); 250 namerec->data.refresh_time = t + MIN(lp_max_ttl()/2, MAX_REFRESH_TIME); 251 } 252 } 253} 254