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 int DEBUGLEVEL;
36 extern fstring myworkgroup;
37 extern char **my_netbios_names;
38 extern struct in_addr ipzero;
40 /* This is the broadcast subnets database. */
41 struct subnet_record *subnetlist = NULL;
43 /* Extra subnets - keep these separate so enumeration code doesn't
44 run onto it by mistake. */
46 struct subnet_record *unicast_subnet = NULL;
47 struct subnet_record *remote_broadcast_subnet = NULL;
48 struct subnet_record *wins_server_subnet = NULL;
50 extern uint16 samba_nb_type; /* Samba's NetBIOS name type. */
52 /****************************************************************************
53 Add a subnet into the list.
54 **************************************************************************/
56 static void add_subnet(struct subnet_record *subrec)
58 struct subnet_record *subrec2;
68 for (subrec2 = subnetlist; subrec2->next; subrec2 = subrec2->next)
71 subrec2->next = subrec;
73 subrec->prev = subrec2;
76 /* ************************************************************************** **
77 * Comparison routine for ordering the splay-tree based namelists assoicated
78 * with each subnet record.
80 * Input: Item - Pointer to the comparison key.
81 * Node - Pointer to a node the splay tree.
83 * Output: The return value will be <0 , ==0, or >0 depending upon the
84 * ordinal relationship of the two keys.
86 * ************************************************************************** **
88 static int namelist_entry_compare( ubi_trItemPtr Item, ubi_trNodePtr Node )
90 struct name_record *NR = (struct name_record *)Node;
94 struct nmb_name *Iname = (struct nmb_name *)Item;
96 Debug1( "nmbd_subnetdb:namelist_entry_compare()\n" );
97 Debug1( "%d == memcmp( \"%s\", \"%s\", %d )\n",
98 memcmp( Item, &(NR->name), sizeof(struct nmb_name) ),
99 nmb_namestr(Iname), nmb_namestr(&NR->name), sizeof(struct nmb_name) );
102 return( memcmp( Item, &(NR->name), sizeof(struct nmb_name) ) );
103 } /* namelist_entry_compare */
105 /****************************************************************************
106 Create a subnet entry.
107 ****************************************************************************/
109 static struct subnet_record *make_subnet(char *name, enum subnet_type type,
110 struct in_addr myip, struct in_addr bcast_ip,
111 struct in_addr mask_ip)
113 struct subnet_record *subrec = NULL;
114 int nmb_sock, dgram_sock;
116 /* Check if we are creating a non broadcast subnet - if so don't create
120 if(type != NORMAL_SUBNET)
128 * Attempt to open the sockets on port 137/138 for this interface
130 * Fail the subnet creation if this fails.
133 if((nmb_sock = open_socket_in(SOCK_DGRAM, global_nmb_port,0, myip.s_addr)) == -1)
137 Debug1( "nmbd_subnetdb:make_subnet()\n" );
138 Debug1( " Failed to open nmb socket on interface %s ", inet_ntoa(myip) );
139 Debug1( "for port %d. ", global_nmb_port );
140 Debug1( "Error was %s\n", strerror(errno) );
145 if((dgram_sock = open_socket_in(SOCK_DGRAM,DGRAM_PORT,3, myip.s_addr)) == -1)
149 Debug1( "nmbd_subnetdb:make_subnet()\n" );
150 Debug1( " Failed to open dgram socket on interface %s ", inet_ntoa(myip) );
151 Debug1( "for port %d. ", DGRAM_PORT );
152 Debug1( "Error was %s\n", strerror(errno) );
157 /* Make sure we can broadcast from these sockets. */
158 set_socket_options(nmb_sock,"SO_BROADCAST");
159 set_socket_options(dgram_sock,"SO_BROADCAST");
163 subrec = (struct subnet_record *)malloc(sizeof(*subrec));
167 DEBUG(0,("make_subnet: malloc fail !\n"));
173 bzero( (char *)subrec, sizeof(*subrec) );
174 (void)ubi_trInitTree( subrec->namelist,
175 namelist_entry_compare,
178 if((subrec->subnet_name = strdup(name)) == NULL)
180 DEBUG(0,("make_subnet: malloc fail for subnet name !\n"));
183 ZERO_STRUCTP(subrec);
184 free((char *)subrec);
188 DEBUG(2, ("making subnet name:%s ", name ));
189 DEBUG(2, ("Broadcast address:%s ", inet_ntoa(bcast_ip)));
190 DEBUG(2, ("Subnet mask:%s\n", inet_ntoa(mask_ip)));
192 subrec->namelist_changed = False;
193 subrec->work_changed = False;
195 subrec->bcast_ip = bcast_ip;
196 subrec->mask_ip = mask_ip;
199 subrec->nmb_sock = nmb_sock;
200 subrec->dgram_sock = dgram_sock;
205 /****************************************************************************
206 Create subnet entries.
207 **************************************************************************/
209 BOOL create_subnets(void)
211 int num_interfaces = iface_count();
213 struct in_addr unicast_ip;
215 if(num_interfaces == 0)
217 DEBUG(0,("create_subnets: No local interfaces !\n"));
222 * Create subnets from all the local interfaces and thread them onto
226 for (i = 0 ; i < num_interfaces; i++)
228 struct subnet_record *subrec;
229 struct interface *iface = get_interface(i);
231 if((subrec = make_subnet(inet_ntoa(iface->ip), NORMAL_SUBNET,
232 iface->ip, iface->bcast,iface->nmask)) == NULL)
238 * If we have been configured to use a WINS server, then try and
239 * get the ip address of it here. If we are the WINS server then
240 * set the unicast subnet address to be the first of our own real
244 if(*lp_wins_server())
246 struct in_addr real_wins_ip;
247 real_wins_ip = *interpret_addr2(lp_wins_server());
249 if (!zero_ip(real_wins_ip))
251 unicast_ip = real_wins_ip;
255 /* The smb.conf's wins server parameter MUST be a host_name
257 DEBUG(0,("invalid smb.conf parameter 'wins server'\n"));
261 else if(lp_we_are_a_wins_server())
263 /* Pick the first interface ip address as the WINS server ip. */
264 unicast_ip = *iface_n_ip(0);
268 /* We should not be using a WINS server at all. Set the
269 ip address of the subnet to be zero. */
274 * Create the unicast and remote broadcast subnets.
275 * Don't put these onto the linked list.
276 * The ip address of the unicast subnet is set to be
277 * the WINS server address, if it exists, or ipzero if not.
280 unicast_subnet = make_subnet( "UNICAST_SUBNET", UNICAST_SUBNET,
281 unicast_ip, unicast_ip, unicast_ip);
283 remote_broadcast_subnet = make_subnet( "REMOTE_BROADCAST_SUBNET",
284 REMOTE_BROADCAST_SUBNET,
285 ipzero, ipzero, ipzero);
287 if((unicast_subnet == NULL) || (remote_broadcast_subnet == NULL))
291 * If we are WINS server, create the WINS_SERVER_SUBNET - don't put on
295 if (lp_we_are_a_wins_server())
297 if((wins_server_subnet = make_subnet("WINS_SERVER_SUBNET",
299 ipzero, ipzero, ipzero)) == NULL)
306 /*******************************************************************
307 Function to tell us if we can use the unicast subnet.
308 ******************************************************************/
310 BOOL we_are_a_wins_client(void)
312 static int cache_we_are_a_wins_client = -1;
314 if(cache_we_are_a_wins_client == -1)
315 cache_we_are_a_wins_client = (ip_equal(ipzero, unicast_subnet->myip) ?
318 return cache_we_are_a_wins_client;
321 /*******************************************************************
322 Access function used by NEXT_SUBNET_INCLUDING_UNICAST
323 ******************************************************************/
325 struct subnet_record *get_next_subnet_maybe_unicast(struct subnet_record *subrec)
327 if(subrec == unicast_subnet)
329 else if((subrec->next == NULL) && we_are_a_wins_client())
330 return unicast_subnet;
335 /*******************************************************************
336 Access function used by retransmit_or_expire_response_records() in
337 nmbd_packets.c. Patch from Andrey Alekseyev <fetch@muffin.arcadia.spb.ru>
338 Needed when we need to enumerate all the broadcast, unicast and
340 ******************************************************************/
342 struct subnet_record *get_next_subnet_maybe_unicast_or_wins_server(struct subnet_record *subrec)
344 if(subrec == unicast_subnet)
346 if(wins_server_subnet)
347 return wins_server_subnet;
352 if(wins_server_subnet && subrec == wins_server_subnet)
355 if((subrec->next == NULL) && we_are_a_wins_client())
356 return unicast_subnet;