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
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.
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.
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.
30 extern int ClientDGRAM;
31 extern int global_nmb_port;
33 extern fstring myworkgroup;
34 extern char **my_netbios_names;
36 /* This is the broadcast subnets database. */
37 struct subnet_record *subnetlist = NULL;
39 /* Extra subnets - keep these separate so enumeration code doesn't
40 run onto it by mistake. */
42 struct subnet_record *unicast_subnet = NULL;
43 struct subnet_record *remote_broadcast_subnet = NULL;
44 struct subnet_record *wins_server_subnet = NULL;
46 extern uint16 samba_nb_type; /* Samba's NetBIOS name type. */
48 /****************************************************************************
49 Add a subnet into the list.
50 **************************************************************************/
52 static void add_subnet(struct subnet_record *subrec)
54 DLIST_ADD(subnetlist, subrec);
57 /* ************************************************************************** **
58 * Comparison routine for ordering the splay-tree based namelists assoicated
59 * with each subnet record.
61 * Input: Item - Pointer to the comparison key.
62 * Node - Pointer to a node the splay tree.
64 * Output: The return value will be <0 , ==0, or >0 depending upon the
65 * ordinal relationship of the two keys.
67 * ************************************************************************** **
69 static int namelist_entry_compare( ubi_trItemPtr Item, ubi_trNodePtr Node )
71 struct name_record *NR = (struct name_record *)Node;
75 struct nmb_name *Iname = (struct nmb_name *)Item;
77 Debug1( "nmbd_subnetdb:namelist_entry_compare()\n" );
78 Debug1( "%d == memcmp( \"%s\", \"%s\", %d )\n",
79 memcmp( Item, &(NR->name), sizeof(struct nmb_name) ),
80 nmb_namestr(Iname), nmb_namestr(&NR->name), (int)sizeof(struct nmb_name) );
83 return( memcmp( Item, &(NR->name), sizeof(struct nmb_name) ) );
84 } /* namelist_entry_compare */
87 /****************************************************************************
88 stop listening on a subnet
89 we don't free the record as we don't have proper reference counting for it
90 yet and it may be in use by a response record
91 ****************************************************************************/
92 void close_subnet(struct subnet_record *subrec)
94 DLIST_REMOVE(subnetlist, subrec);
96 if (subrec->dgram_sock != -1) {
97 close(subrec->dgram_sock);
98 subrec->dgram_sock = -1;
100 if (subrec->nmb_sock != -1) {
101 close(subrec->nmb_sock);
102 subrec->nmb_sock = -1;
108 /****************************************************************************
109 Create a subnet entry.
110 ****************************************************************************/
112 static struct subnet_record *make_subnet(char *name, enum subnet_type type,
113 struct in_addr myip, struct in_addr bcast_ip,
114 struct in_addr mask_ip)
116 struct subnet_record *subrec = NULL;
117 int nmb_sock, dgram_sock;
119 /* Check if we are creating a non broadcast subnet - if so don't create
123 if(type != NORMAL_SUBNET)
131 * Attempt to open the sockets on port 137/138 for this interface
133 * Fail the subnet creation if this fails.
136 if((nmb_sock = open_socket_in(SOCK_DGRAM, global_nmb_port,0, myip.s_addr,True)) == -1)
140 Debug1( "nmbd_subnetdb:make_subnet()\n" );
141 Debug1( " Failed to open nmb socket on interface %s ", inet_ntoa(myip) );
142 Debug1( "for port %d. ", global_nmb_port );
143 Debug1( "Error was %s\n", strerror(errno) );
148 if((dgram_sock = open_socket_in(SOCK_DGRAM,DGRAM_PORT,3, myip.s_addr,True)) == -1)
152 Debug1( "nmbd_subnetdb:make_subnet()\n" );
153 Debug1( " Failed to open dgram socket on interface %s ", inet_ntoa(myip) );
154 Debug1( "for port %d. ", DGRAM_PORT );
155 Debug1( "Error was %s\n", strerror(errno) );
160 /* Make sure we can broadcast from these sockets. */
161 set_socket_options(nmb_sock,"SO_BROADCAST");
162 set_socket_options(dgram_sock,"SO_BROADCAST");
166 subrec = (struct subnet_record *)malloc(sizeof(*subrec));
170 DEBUG(0,("make_subnet: malloc fail !\n"));
176 memset( (char *)subrec, '\0', sizeof(*subrec) );
177 (void)ubi_trInitTree( subrec->namelist,
178 namelist_entry_compare,
181 if((subrec->subnet_name = strdup(name)) == NULL)
183 DEBUG(0,("make_subnet: malloc fail for subnet name !\n"));
186 ZERO_STRUCTP(subrec);
191 DEBUG(2, ("making subnet name:%s ", name ));
192 DEBUG(2, ("Broadcast address:%s ", inet_ntoa(bcast_ip)));
193 DEBUG(2, ("Subnet mask:%s\n", inet_ntoa(mask_ip)));
195 subrec->namelist_changed = False;
196 subrec->work_changed = False;
198 subrec->bcast_ip = bcast_ip;
199 subrec->mask_ip = mask_ip;
202 subrec->nmb_sock = nmb_sock;
203 subrec->dgram_sock = dgram_sock;
209 /****************************************************************************
210 Create a normal subnet
211 **************************************************************************/
212 struct subnet_record *make_normal_subnet(struct interface *iface)
214 struct subnet_record *subrec;
216 subrec = make_subnet(inet_ntoa(iface->ip), NORMAL_SUBNET,
217 iface->ip, iface->bcast, iface->nmask);
225 /****************************************************************************
226 Create subnet entries.
227 **************************************************************************/
229 BOOL create_subnets(void)
231 int num_interfaces = iface_count();
233 struct in_addr unicast_ip, ipzero;
234 extern struct in_addr loopback_ip;
236 if(num_interfaces == 0)
238 DEBUG(0,("create_subnets: No local interfaces !\n"));
243 * Create subnets from all the local interfaces and thread them onto
247 for (i = 0 ; i < num_interfaces; i++)
249 struct interface *iface = get_interface(i);
252 * We don't want to add a loopback interface, in case
253 * someone has added 127.0.0.1 for smbd, nmbd needs to
254 * ignore it here. JRA.
257 if (ip_equal(iface->ip, loopback_ip)) {
258 DEBUG(2,("create_subnets: Ignoring loopback interface.\n" ));
262 if (!make_normal_subnet(iface)) return False;
266 * If we have been configured to use a WINS server, then try and
267 * get the ip address of it here. If we are the WINS server then
268 * set the unicast subnet address to be the first of our own real
271 * NOTE: I'm not sure of the implications of WINS server failover
272 * on this bit of code. Because of failover, the WINS
273 * server address can change. crh
276 if( wins_srv_count() )
278 struct in_addr real_wins_ip;
279 real_wins_ip = wins_srv_ip();
281 if (!is_zero_ip(real_wins_ip))
283 unicast_ip = real_wins_ip;
287 /* wins_srv_ip() can return a zero IP if all servers are
288 * either down or incorrectly entered in smb.conf. crh
290 DEBUG(0,("No 'live' WINS servers found. Check 'wins server' parameter.\n"));
294 else if(lp_we_are_a_wins_server())
296 /* Pick the first interface ip address as the WINS server ip. */
297 unicast_ip = *iface_n_ip(0);
301 /* We should not be using a WINS server at all. Set the
302 ip address of the subnet to be zero. */
303 zero_ip(&unicast_ip);
307 * Create the unicast and remote broadcast subnets.
308 * Don't put these onto the linked list.
309 * The ip address of the unicast subnet is set to be
310 * the WINS server address, if it exists, or ipzero if not.
313 unicast_subnet = make_subnet( "UNICAST_SUBNET", UNICAST_SUBNET,
314 unicast_ip, unicast_ip, unicast_ip);
318 remote_broadcast_subnet = make_subnet( "REMOTE_BROADCAST_SUBNET",
319 REMOTE_BROADCAST_SUBNET,
320 ipzero, ipzero, ipzero);
322 if((unicast_subnet == NULL) || (remote_broadcast_subnet == NULL))
326 * If we are WINS server, create the WINS_SERVER_SUBNET - don't put on
330 if (lp_we_are_a_wins_server())
332 if( (wins_server_subnet = make_subnet( "WINS_SERVER_SUBNET",
334 ipzero, ipzero, ipzero )) == NULL )
341 /*******************************************************************
342 Function to tell us if we can use the unicast subnet.
343 ******************************************************************/
345 BOOL we_are_a_wins_client(void)
347 static int cache_we_are_a_wins_client = -1;
349 if(cache_we_are_a_wins_client == -1)
350 cache_we_are_a_wins_client = (is_zero_ip(unicast_subnet->myip) ?
353 return cache_we_are_a_wins_client;
356 /*******************************************************************
357 Access function used by NEXT_SUBNET_INCLUDING_UNICAST
358 ******************************************************************/
360 struct subnet_record *get_next_subnet_maybe_unicast(struct subnet_record *subrec)
362 if(subrec == unicast_subnet)
364 else if((subrec->next == NULL) && we_are_a_wins_client())
365 return unicast_subnet;
370 /*******************************************************************
371 Access function used by retransmit_or_expire_response_records() in
372 nmbd_packets.c. Patch from Andrey Alekseyev <fetch@muffin.arcadia.spb.ru>
373 Needed when we need to enumerate all the broadcast, unicast and
375 ******************************************************************/
377 struct subnet_record *get_next_subnet_maybe_unicast_or_wins_server(struct subnet_record *subrec)
379 if(subrec == unicast_subnet)
381 if(wins_server_subnet)
382 return wins_server_subnet;
387 if(wins_server_subnet && subrec == wins_server_subnet)
390 if((subrec->next == NULL) && we_are_a_wins_client())
391 return unicast_subnet;