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 Create a subnet entry.
78 ****************************************************************************/
80 static struct subnet_record *make_subnet(char *name, enum subnet_type type,
81 struct in_addr myip, struct in_addr bcast_ip,
82 struct in_addr mask_ip)
84 struct subnet_record *subrec = NULL;
85 int nmb_sock, dgram_sock;
87 /* Check if we are creating a non broadcast subnet - if so don't create
91 if(type != NORMAL_SUBNET)
99 * Attempt to open the sockets on port 137/138 for this interface
101 * Fail the subnet creation if this fails.
104 if((nmb_sock = open_socket_in(SOCK_DGRAM, global_nmb_port,0, myip.s_addr)) == -1)
106 DEBUG(0,("make_subnet: Failed to open nmb socket on interface %s \
107 for port %d. Error was %s\n", inet_ntoa(myip), global_nmb_port, strerror(errno)));
111 if((dgram_sock = open_socket_in(SOCK_DGRAM,DGRAM_PORT,3, myip.s_addr)) == -1)
113 DEBUG(0,("make_subnet: Failed to open dgram socket on interface %s \
114 for port %d. Error was %s\n", inet_ntoa(myip), DGRAM_PORT, strerror(errno)));
118 /* Make sure we can broadcast from these sockets. */
119 set_socket_options(nmb_sock,"SO_BROADCAST");
120 set_socket_options(dgram_sock,"SO_BROADCAST");
124 subrec = (struct subnet_record *)malloc(sizeof(*subrec));
128 DEBUG(0,("make_subnet: malloc fail !\n"));
134 bzero((char *)subrec,sizeof(*subrec));
136 if((subrec->subnet_name = strdup(name)) == NULL)
138 DEBUG(0,("make_subnet: malloc fail for subnet name !\n"));
141 free((char *)subrec);
145 DEBUG(2, ("making subnet name:%s ", name ));
146 DEBUG(2, ("Broadcast address:%s ", inet_ntoa(bcast_ip)));
147 DEBUG(2, ("Subnet mask:%s\n", inet_ntoa(mask_ip)));
149 subrec->namelist_changed = False;
150 subrec->work_changed = False;
152 subrec->bcast_ip = bcast_ip;
153 subrec->mask_ip = mask_ip;
156 subrec->nmb_sock = nmb_sock;
157 subrec->dgram_sock = dgram_sock;
162 /****************************************************************************
163 Create subnet entries.
164 **************************************************************************/
166 BOOL create_subnets(void)
168 int num_interfaces = iface_count();
170 struct in_addr unicast_ip;
172 if(num_interfaces == 0)
174 DEBUG(0,("create_subnets: No local interfaces !\n"));
179 * Create subnets from all the local interfaces and thread them onto
183 for (i = 0 ; i < num_interfaces; i++)
185 struct subnet_record *subrec;
186 struct interface *iface = get_interface(i);
188 if((subrec = make_subnet(inet_ntoa(iface->ip), NORMAL_SUBNET,
189 iface->ip, iface->bcast,iface->nmask)) == NULL)
195 * If we have been configured to use a WINS server, then try and
196 * get the ip address of it here. If we are the WINS server then
197 * set the unicast subnet address to be the first of our own real
201 if(*lp_wins_server())
203 struct in_addr real_wins_ip;
204 real_wins_ip = *interpret_addr2(lp_wins_server());
206 if (!zero_ip(real_wins_ip))
208 unicast_ip = real_wins_ip;
212 /* The smb.conf's wins server parameter MUST be a host_name
214 DEBUG(0,("invalid smb.conf parameter 'wins server'\n"));
218 else if(lp_we_are_a_wins_server())
220 /* Pick the first interface ip address as the WINS server ip. */
221 unicast_ip = *iface_n_ip(0);
225 /* We should not be using a WINS server at all. Set the
226 ip address of the subnet to be zero. */
231 * Create the unicast and remote broadcast subnets.
232 * Don't put these onto the linked list.
233 * The ip address of the unicast subnet is set to be
234 * the WINS server address, if it exists, or ipzero if not.
237 unicast_subnet = make_subnet( "UNICAST_SUBNET", UNICAST_SUBNET,
238 unicast_ip, unicast_ip, unicast_ip);
240 remote_broadcast_subnet = make_subnet( "REMOTE_BROADCAST_SUBNET",
241 REMOTE_BROADCAST_SUBNET,
242 ipzero, ipzero, ipzero);
244 if((unicast_subnet == NULL) || (remote_broadcast_subnet == NULL))
248 * If we are WINS server, create the WINS_SERVER_SUBNET - don't put on
252 if (lp_we_are_a_wins_server())
254 if((wins_server_subnet = make_subnet("WINS_SERVER_SUBNET",
256 ipzero, ipzero, ipzero)) == NULL)
263 /*******************************************************************
264 Function to tell us if we can use the unicast subnet.
265 ******************************************************************/
267 BOOL we_are_a_wins_client(void)
269 static int cache_we_are_a_wins_client = -1;
271 if(cache_we_are_a_wins_client == -1)
272 cache_we_are_a_wins_client = (ip_equal(ipzero, unicast_subnet->myip) ?
275 return cache_we_are_a_wins_client;
278 /*******************************************************************
279 Access function used by NEXT_SUBNET_INCLUDING_UNICAST
280 ******************************************************************/
282 struct subnet_record *get_next_subnet_maybe_unicast(struct subnet_record *subrec)
284 if(subrec == unicast_subnet)
286 else if((subrec->next == NULL) && we_are_a_wins_client())
287 return unicast_subnet;
292 /*******************************************************************
293 Access function used by retransmit_or_expire_response_records() in
294 nmbd_packets.c. Patch from Andrey Alekseyev <fetch@muffin.arcadia.spb.ru>
295 Needed when we need to enumerate all the broadcast, unicast and
297 ******************************************************************/
299 struct subnet_record *get_next_subnet_maybe_unicast_or_wins_server(struct subnet_record *subrec)
301 if(subrec == unicast_subnet)
303 if(wins_server_subnet)
304 return wins_server_subnet;
309 if(wins_server_subnet && subrec == wins_server_subnet)
312 if((subrec->next == NULL) && we_are_a_wins_client())
313 return unicast_subnet;