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 3 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, see <http://www.gnu.org/licenses/>.
27 extern struct in_addr loopback_ip;
28 extern int global_nmb_port;
30 /* This is the broadcast subnets database. */
31 struct subnet_record *subnetlist = NULL;
33 /* Extra subnets - keep these separate so enumeration code doesn't
34 run onto it by mistake. */
36 struct subnet_record *unicast_subnet = NULL;
37 struct subnet_record *remote_broadcast_subnet = NULL;
38 struct subnet_record *wins_server_subnet = NULL;
40 extern uint16 samba_nb_type; /* Samba's NetBIOS name type. */
42 /****************************************************************************
43 Add a subnet into the list.
44 **************************************************************************/
46 static void add_subnet(struct subnet_record *subrec)
48 DLIST_ADD(subnetlist, subrec);
51 /****************************************************************************
52 stop listening on a subnet
53 we don't free the record as we don't have proper reference counting for it
54 yet and it may be in use by a response record
55 ****************************************************************************/
57 void close_subnet(struct subnet_record *subrec)
59 if (subrec->dgram_sock != -1) {
60 close(subrec->dgram_sock);
61 subrec->dgram_sock = -1;
63 if (subrec->nmb_sock != -1) {
64 close(subrec->nmb_sock);
65 subrec->nmb_sock = -1;
68 DLIST_REMOVE(subnetlist, subrec);
71 /****************************************************************************
72 Create a subnet entry.
73 ****************************************************************************/
75 static struct subnet_record *make_subnet(const char *name, enum subnet_type type,
76 struct in_addr myip, struct in_addr bcast_ip,
77 struct in_addr mask_ip)
79 struct subnet_record *subrec = NULL;
80 int nmb_sock, dgram_sock;
82 /* Check if we are creating a non broadcast subnet - if so don't create
85 if(type != NORMAL_SUBNET) {
90 * Attempt to open the sockets on port 137/138 for this interface
92 * Fail the subnet creation if this fails.
95 if((nmb_sock = open_socket_in(SOCK_DGRAM, global_nmb_port,0, myip.s_addr,True)) == -1) {
97 Debug1( "nmbd_subnetdb:make_subnet()\n" );
98 Debug1( " Failed to open nmb socket on interface %s ", inet_ntoa(myip) );
99 Debug1( "for port %d. ", global_nmb_port );
100 Debug1( "Error was %s\n", strerror(errno) );
105 if((dgram_sock = open_socket_in(SOCK_DGRAM,DGRAM_PORT,3, myip.s_addr,True)) == -1) {
106 if( DEBUGLVL( 0 ) ) {
107 Debug1( "nmbd_subnetdb:make_subnet()\n" );
108 Debug1( " Failed to open dgram socket on interface %s ", inet_ntoa(myip) );
109 Debug1( "for port %d. ", DGRAM_PORT );
110 Debug1( "Error was %s\n", strerror(errno) );
115 /* Make sure we can broadcast from these sockets. */
116 set_socket_options(nmb_sock,"SO_BROADCAST");
117 set_socket_options(dgram_sock,"SO_BROADCAST");
119 /* Set them non-blocking. */
120 set_blocking(nmb_sock, False);
121 set_blocking(dgram_sock, False);
124 subrec = SMB_MALLOC_P(struct subnet_record);
126 DEBUG(0,("make_subnet: malloc fail !\n"));
132 ZERO_STRUCTP(subrec);
134 if((subrec->subnet_name = SMB_STRDUP(name)) == NULL) {
135 DEBUG(0,("make_subnet: malloc fail for subnet name !\n"));
138 ZERO_STRUCTP(subrec);
143 DEBUG(2, ("making subnet name:%s ", name ));
144 DEBUG(2, ("Broadcast address:%s ", inet_ntoa(bcast_ip)));
145 DEBUG(2, ("Subnet mask:%s\n", inet_ntoa(mask_ip)));
147 subrec->namelist_changed = False;
148 subrec->work_changed = False;
150 subrec->bcast_ip = bcast_ip;
151 subrec->mask_ip = mask_ip;
154 subrec->nmb_sock = nmb_sock;
155 subrec->dgram_sock = dgram_sock;
160 /****************************************************************************
161 Create a normal subnet
162 **************************************************************************/
164 struct subnet_record *make_normal_subnet(struct interface *iface)
166 struct subnet_record *subrec;
168 subrec = make_subnet(inet_ntoa(iface->ip), NORMAL_SUBNET,
169 iface->ip, iface->bcast, iface->nmask);
176 /****************************************************************************
177 Create subnet entries.
178 **************************************************************************/
180 BOOL create_subnets(void)
182 int num_interfaces = iface_count();
184 struct in_addr unicast_ip, ipzero;
186 if(num_interfaces == 0) {
187 void (*saved_handler)(int);
189 DEBUG(0,("create_subnets: No local interfaces !\n"));
190 DEBUG(0,("create_subnets: Waiting for an interface to appear ...\n"));
193 * Whilst we're waiting for an interface, allow SIGTERM to
197 saved_handler = CatchSignal( SIGTERM, SIGNAL_CAST SIG_DFL );
199 while (iface_count() == 0) {
205 * We got an interface, restore our normal term handler.
208 CatchSignal( SIGTERM, SIGNAL_CAST saved_handler );
211 num_interfaces = iface_count();
214 * Create subnets from all the local interfaces and thread them onto
218 for (i = 0 ; i < num_interfaces; i++) {
219 struct interface *iface = get_interface(i);
222 DEBUG(2,("create_subnets: can't get interface %d.\n", i ));
227 * We don't want to add a loopback interface, in case
228 * someone has added 127.0.0.1 for smbd, nmbd needs to
229 * ignore it here. JRA.
232 if (ip_equal(iface->ip, loopback_ip)) {
233 DEBUG(2,("create_subnets: Ignoring loopback interface.\n" ));
237 if (!make_normal_subnet(iface))
241 /* We must have at least one subnet. */
242 if (subnetlist == NULL) {
243 DEBUG(0,("create_subnets: unable to create any subnet from "
244 "given interfaces. nmbd is terminating\n"));
248 if (lp_we_are_a_wins_server()) {
249 /* Pick the first interface ip address as the WINS server ip. */
250 struct in_addr *nip = iface_n_ip(0);
258 /* note that we do not set the wins server IP here. We just
259 set it at zero and let the wins registration code cope
260 with getting the IPs right for each packet */
261 zero_ip(&unicast_ip);
265 * Create the unicast and remote broadcast subnets.
266 * Don't put these onto the linked list.
267 * The ip address of the unicast subnet is set to be
268 * the WINS server address, if it exists, or ipzero if not.
271 unicast_subnet = make_subnet( "UNICAST_SUBNET", UNICAST_SUBNET,
272 unicast_ip, unicast_ip, unicast_ip);
276 remote_broadcast_subnet = make_subnet( "REMOTE_BROADCAST_SUBNET",
277 REMOTE_BROADCAST_SUBNET,
278 ipzero, ipzero, ipzero);
280 if((unicast_subnet == NULL) || (remote_broadcast_subnet == NULL))
284 * If we are WINS server, create the WINS_SERVER_SUBNET - don't put on
288 if (lp_we_are_a_wins_server()) {
289 if( (wins_server_subnet = make_subnet( "WINS_SERVER_SUBNET",
291 ipzero, ipzero, ipzero )) == NULL )
298 /*******************************************************************
299 Function to tell us if we can use the unicast subnet.
300 ******************************************************************/
302 BOOL we_are_a_wins_client(void)
304 if (wins_srv_count() > 0) {
311 /*******************************************************************
312 Access function used by NEXT_SUBNET_INCLUDING_UNICAST
313 ******************************************************************/
315 struct subnet_record *get_next_subnet_maybe_unicast(struct subnet_record *subrec)
317 if(subrec == unicast_subnet)
319 else if((subrec->next == NULL) && we_are_a_wins_client())
320 return unicast_subnet;
325 /*******************************************************************
326 Access function used by retransmit_or_expire_response_records() in
327 nmbd_packets.c. Patch from Andrey Alekseyev <fetch@muffin.arcadia.spb.ru>
328 Needed when we need to enumerate all the broadcast, unicast and
330 ******************************************************************/
332 struct subnet_record *get_next_subnet_maybe_unicast_or_wins_server(struct subnet_record *subrec)
334 if(subrec == unicast_subnet) {
335 if(wins_server_subnet)
336 return wins_server_subnet;
341 if(wins_server_subnet && subrec == wins_server_subnet)
344 if((subrec->next == NULL) && we_are_a_wins_client())
345 return unicast_subnet;