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 pstring myname;
37 extern fstring myworkgroup;
38 extern char **my_netbios_names;
39 extern struct in_addr ipzero;
41 /* This is the broadcast subnets database. */
42 struct subnet_record *subnetlist = NULL;
44 /* Extra subnets - keep these separate so enumeration code doesn't
45 run onto it by mistake. */
47 struct subnet_record *unicast_subnet = NULL;
48 struct subnet_record *remote_broadcast_subnet = NULL;
49 struct subnet_record *wins_server_subnet = NULL;
51 extern uint16 samba_nb_type; /* Samba's NetBIOS name type. */
53 /****************************************************************************
54 Add a subnet into the list.
55 **************************************************************************/
57 static void add_subnet(struct subnet_record *subrec)
59 struct subnet_record *subrec2;
69 for (subrec2 = subnetlist; subrec2->next; subrec2 = subrec2->next)
72 subrec2->next = subrec;
74 subrec->prev = subrec2;
77 /****************************************************************************
78 Create a subnet entry.
79 ****************************************************************************/
81 static struct subnet_record *make_subnet(char *name, enum subnet_type type,
82 struct in_addr myip, struct in_addr bcast_ip,
83 struct in_addr mask_ip)
85 struct subnet_record *subrec = NULL;
86 int nmb_sock, dgram_sock;
88 /* Check if we are creating a non broadcast subnet - if so don't create
92 if(type != NORMAL_SUBNET)
100 * Attempt to open the sockets on port 137/138 for this interface
102 * Fail the subnet creation if this fails.
105 if((nmb_sock = open_socket_in(SOCK_DGRAM, global_nmb_port,0, myip.s_addr)) == -1)
107 DEBUG(0,("make_subnet: Failed to open nmb socket on interface %s \
108 for port %d. Error was %s\n", inet_ntoa(myip), global_nmb_port, strerror(errno)));
112 if((dgram_sock = open_socket_in(SOCK_DGRAM,DGRAM_PORT,3, myip.s_addr)) == -1)
114 DEBUG(0,("make_subnet: Failed to open dgram socket on interface %s \
115 for port %d. Error was %s\n", inet_ntoa(myip), DGRAM_PORT, strerror(errno)));
119 /* Make sure we can broadcast from these sockets. */
120 set_socket_options(nmb_sock,"SO_BROADCAST");
121 set_socket_options(dgram_sock,"SO_BROADCAST");
125 subrec = (struct subnet_record *)malloc(sizeof(*subrec));
129 DEBUG(0,("make_subnet: malloc fail !\n"));
135 bzero((char *)subrec,sizeof(*subrec));
137 if((subrec->subnet_name = strdup(name)) == NULL)
139 DEBUG(0,("make_subnet: malloc fail for subnet name !\n"));
142 free((char *)subrec);
146 DEBUG(2, ("making subnet name:%s ", name ));
147 DEBUG(2, ("Broadcast address:%s ", inet_ntoa(bcast_ip)));
148 DEBUG(2, ("Subnet mask:%s\n", inet_ntoa(mask_ip)));
150 subrec->namelist_changed = False;
151 subrec->work_changed = False;
153 subrec->bcast_ip = bcast_ip;
154 subrec->mask_ip = mask_ip;
157 subrec->nmb_sock = nmb_sock;
158 subrec->dgram_sock = dgram_sock;
163 /****************************************************************************
164 Create subnet entries.
165 **************************************************************************/
167 BOOL create_subnets()
169 int num_interfaces = iface_count();
171 struct in_addr unicast_ip;
173 if(num_interfaces == 0)
175 DEBUG(0,("create_subnets: No local interfaces !\n"));
180 * Create subnets from all the local interfaces and thread them onto
184 for (i = 0 ; i < num_interfaces; i++)
186 struct subnet_record *subrec;
187 struct interface *iface = get_interface(i);
189 if((subrec = make_subnet(inet_ntoa(iface->ip), NORMAL_SUBNET,
190 iface->ip, iface->bcast,iface->nmask)) == NULL)
196 * If we have been configured to use a WINS server, then try and
197 * get the ip address of it here. If we are the WINS server then
198 * set the unicast subnet address to be the first of our own real
202 if(*lp_wins_server())
204 struct in_addr real_wins_ip;
205 real_wins_ip = *interpret_addr2(lp_wins_server());
207 if (!zero_ip(real_wins_ip))
209 unicast_ip = real_wins_ip;
213 /* The smb.conf's wins server parameter MUST be a host_name
215 DEBUG(0,("invalid smb.conf parameter 'wins server'\n"));
219 else if(lp_we_are_a_wins_server())
221 /* Pick the first interface ip address as the WINS server ip. */
222 unicast_ip = *iface_n_ip(0);
226 /* We should not be using a WINS server at all. Set the
227 ip address of the subnet to be zero. */
232 * Create the unicast and remote broadcast subnets.
233 * Don't put these onto the linked list.
234 * The ip address of the unicast subnet is set to be
235 * the WINS server address, if it exists, or ipzero if not.
238 unicast_subnet = make_subnet( "UNICAST_SUBNET", UNICAST_SUBNET,
239 unicast_ip, unicast_ip, unicast_ip);
241 remote_broadcast_subnet = make_subnet( "REMOTE_BROADCAST_SUBNET",
242 REMOTE_BROADCAST_SUBNET,
243 ipzero, ipzero, ipzero);
245 if((unicast_subnet == NULL) || (remote_broadcast_subnet == NULL))
249 * If we are WINS server, create the WINS_SERVER_SUBNET - don't put on
253 if (lp_we_are_a_wins_server())
255 if((wins_server_subnet = make_subnet("WINS_SERVER_SUBNET",
257 ipzero, ipzero, ipzero)) == NULL)
264 /*******************************************************************
265 Function to tell us if we can use the unicast subnet.
266 ******************************************************************/
268 BOOL we_are_a_wins_client()
270 static int cache_we_are_a_wins_client = -1;
272 if(cache_we_are_a_wins_client == -1)
273 cache_we_are_a_wins_client = (ip_equal(ipzero, unicast_subnet->myip) ?
276 return cache_we_are_a_wins_client;
279 /*******************************************************************
280 Access function used by NEXT_SUBNET_INCLUDING_UNICAST
281 ******************************************************************/
283 struct subnet_record *get_next_subnet_maybe_unicast(struct subnet_record *subrec)
285 if(subrec == unicast_subnet)
287 else if((subrec->next == NULL) && we_are_a_wins_client())
288 return unicast_subnet;
293 /*******************************************************************
294 Access function used by retransmit_or_expire_response_records() in
295 nmbd_packets.c. Patch from Andrey Alekseyev <fetch@muffin.arcadia.spb.ru>
296 Needed when we need to enumerate all the broadcast, unicast and
298 ******************************************************************/
300 struct subnet_record *get_next_subnet_maybe_unicast_or_wins_server(struct subnet_record *subrec)
302 if(subrec == unicast_subnet)
304 if(wins_server_subnet)
305 return wins_server_subnet;
310 if(wins_server_subnet && subrec == wins_server_subnet)
313 if((subrec->next == NULL) && we_are_a_wins_client())
314 return unicast_subnet;