2 Unix SMB/Netbios implementation.
4 NBT netbios routines and daemon - version 2
5 Copyright (C) Andrew Tridgell 1994-1998
6 Copyright (C) Luke Kenneth Casson Leighton 1994-1998
7 Copyright (C) Jeremy Allison 1994-1998
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
31 extern int ClientDGRAM
;
32 extern int global_nmb_port
;
34 extern fstring myworkgroup
;
35 extern char **my_netbios_names
;
36 extern struct in_addr ipzero
;
38 /* This is the broadcast subnets database. */
39 struct subnet_record
*subnetlist
= NULL
;
41 /* Extra subnets - keep these separate so enumeration code doesn't
42 run onto it by mistake. */
44 struct subnet_record
*unicast_subnet
= NULL
;
45 struct subnet_record
*remote_broadcast_subnet
= NULL
;
46 struct subnet_record
*wins_server_subnet
= NULL
;
48 extern uint16 samba_nb_type
; /* Samba's NetBIOS name type. */
50 /****************************************************************************
51 Add a subnet into the list.
52 **************************************************************************/
54 static void add_subnet(struct subnet_record
*subrec
)
56 DLIST_ADD(subnetlist
, subrec
);
59 /* ************************************************************************** **
60 * Comparison routine for ordering the splay-tree based namelists assoicated
61 * with each subnet record.
63 * Input: Item - Pointer to the comparison key.
64 * Node - Pointer to a node the splay tree.
66 * Output: The return value will be <0 , ==0, or >0 depending upon the
67 * ordinal relationship of the two keys.
69 * ************************************************************************** **
71 static int namelist_entry_compare( ubi_trItemPtr Item
, ubi_trNodePtr Node
)
73 struct name_record
*NR
= (struct name_record
*)Node
;
77 struct nmb_name
*Iname
= (struct nmb_name
*)Item
;
79 Debug1( "nmbd_subnetdb:namelist_entry_compare()\n" );
80 Debug1( "%d == memcmp( \"%s\", \"%s\", %d )\n",
81 memcmp( Item
, &(NR
->name
), sizeof(struct nmb_name
) ),
82 nmb_namestr(Iname
), nmb_namestr(&NR
->name
), (int)sizeof(struct nmb_name
) );
85 return( memcmp( Item
, &(NR
->name
), sizeof(struct nmb_name
) ) );
86 } /* namelist_entry_compare */
89 /****************************************************************************
90 stop listening on a subnet
91 we don't free the record as we don't have proper reference counting for it
92 yet and it may be in use by a response record
93 ****************************************************************************/
94 void close_subnet(struct subnet_record
*subrec
)
96 DLIST_REMOVE(subnetlist
, subrec
);
98 if (subrec
->dgram_sock
!= -1) {
99 close(subrec
->dgram_sock
);
100 subrec
->dgram_sock
= -1;
102 if (subrec
->nmb_sock
!= -1) {
103 close(subrec
->nmb_sock
);
104 subrec
->nmb_sock
= -1;
110 /****************************************************************************
111 Create a subnet entry.
112 ****************************************************************************/
114 static struct subnet_record
*make_subnet(char *name
, enum subnet_type type
,
115 struct in_addr myip
, struct in_addr bcast_ip
,
116 struct in_addr mask_ip
)
118 struct subnet_record
*subrec
= NULL
;
119 int nmb_sock
, dgram_sock
;
121 /* Check if we are creating a non broadcast subnet - if so don't create
125 if(type
!= NORMAL_SUBNET
)
133 * Attempt to open the sockets on port 137/138 for this interface
135 * Fail the subnet creation if this fails.
138 if((nmb_sock
= open_socket_in(SOCK_DGRAM
, global_nmb_port
,0, myip
.s_addr
,True
)) == -1)
142 Debug1( "nmbd_subnetdb:make_subnet()\n" );
143 Debug1( " Failed to open nmb socket on interface %s ", inet_ntoa(myip
) );
144 Debug1( "for port %d. ", global_nmb_port
);
145 Debug1( "Error was %s\n", strerror(errno
) );
150 if((dgram_sock
= open_socket_in(SOCK_DGRAM
,DGRAM_PORT
,3, myip
.s_addr
,True
)) == -1)
154 Debug1( "nmbd_subnetdb:make_subnet()\n" );
155 Debug1( " Failed to open dgram socket on interface %s ", inet_ntoa(myip
) );
156 Debug1( "for port %d. ", DGRAM_PORT
);
157 Debug1( "Error was %s\n", strerror(errno
) );
162 /* Make sure we can broadcast from these sockets. */
163 set_socket_options(nmb_sock
,"SO_BROADCAST");
164 set_socket_options(dgram_sock
,"SO_BROADCAST");
168 subrec
= (struct subnet_record
*)malloc(sizeof(*subrec
));
172 DEBUG(0,("make_subnet: malloc fail !\n"));
178 memset( (char *)subrec
, '\0', sizeof(*subrec
) );
179 (void)ubi_trInitTree( subrec
->namelist
,
180 namelist_entry_compare
,
183 if((subrec
->subnet_name
= strdup(name
)) == NULL
)
185 DEBUG(0,("make_subnet: malloc fail for subnet name !\n"));
188 ZERO_STRUCTP(subrec
);
189 free((char *)subrec
);
193 DEBUG(2, ("making subnet name:%s ", name
));
194 DEBUG(2, ("Broadcast address:%s ", inet_ntoa(bcast_ip
)));
195 DEBUG(2, ("Subnet mask:%s\n", inet_ntoa(mask_ip
)));
197 subrec
->namelist_changed
= False
;
198 subrec
->work_changed
= False
;
200 subrec
->bcast_ip
= bcast_ip
;
201 subrec
->mask_ip
= mask_ip
;
204 subrec
->nmb_sock
= nmb_sock
;
205 subrec
->dgram_sock
= dgram_sock
;
211 /****************************************************************************
212 Create a normal subnet
213 **************************************************************************/
214 struct subnet_record
*make_normal_subnet(struct interface
*iface
)
216 struct subnet_record
*subrec
;
218 subrec
= make_subnet(inet_ntoa(iface
->ip
), NORMAL_SUBNET
,
219 iface
->ip
, iface
->bcast
, iface
->nmask
);
227 /****************************************************************************
228 Create subnet entries.
229 **************************************************************************/
231 BOOL
create_subnets(void)
233 int num_interfaces
= iface_count();
235 struct in_addr unicast_ip
;
236 extern struct in_addr loopback_ip
;
238 if(num_interfaces
== 0)
240 DEBUG(0,("create_subnets: No local interfaces !\n"));
245 * Create subnets from all the local interfaces and thread them onto
249 for (i
= 0 ; i
< num_interfaces
; i
++)
251 struct interface
*iface
= get_interface(i
);
254 * We don't want to add a loopback interface, in case
255 * someone has added 127.0.0.1 for smbd, nmbd needs to
256 * ignore it here. JRA.
259 if (ip_equal(iface
->ip
, loopback_ip
)) {
260 DEBUG(2,("create_subnets: Ignoring loopback interface.\n" ));
264 if (!make_normal_subnet(iface
)) return False
;
268 * If we have been configured to use a WINS server, then try and
269 * get the ip address of it here. If we are the WINS server then
270 * set the unicast subnet address to be the first of our own real
273 * NOTE: I'm not sure of the implications of WINS server failover
274 * on this bit of code. Because of failover, the WINS
275 * server address can change. crh
278 if(*lp_wins_server())
280 struct in_addr real_wins_ip
;
281 real_wins_ip
= wins_srv_ip();
283 if (!zero_ip(real_wins_ip
))
285 unicast_ip
= real_wins_ip
;
289 /* wins_srv_ip() can return a zero IP if all servers are
290 * either down or incorrectly entered in smb.conf. crh
292 DEBUG(0,("No 'live' WINS servers found. Check 'wins server' parameter.\n"));
296 else if(lp_we_are_a_wins_server())
298 /* Pick the first interface ip address as the WINS server ip. */
299 unicast_ip
= *iface_n_ip(0);
303 /* We should not be using a WINS server at all. Set the
304 ip address of the subnet to be zero. */
309 * Create the unicast and remote broadcast subnets.
310 * Don't put these onto the linked list.
311 * The ip address of the unicast subnet is set to be
312 * the WINS server address, if it exists, or ipzero if not.
315 unicast_subnet
= make_subnet( "UNICAST_SUBNET", UNICAST_SUBNET
,
316 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
= (ip_equal(ipzero
, 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
;