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;
77 /* ************************************************************************** ** * This will go away when we move to a "real" database back-end.
78 * ************************************************************************** ** */
79 int namelist_entry_compare( ubi_trItemPtr Item, ubi_trNodePtr Node )
81 struct name_record *NR = (struct name_record *)Node;
83 return( memcmp( Item, &(NR->name), sizeof(struct nmb_name) ) );
84 } /* namelist_entry_compare */
87 /****************************************************************************
88 Create a subnet entry.
89 ****************************************************************************/
91 static struct subnet_record *make_subnet(char *name, enum subnet_type type,
92 struct in_addr myip, struct in_addr bcast_ip,
93 struct in_addr mask_ip)
95 struct subnet_record *subrec = NULL;
96 int nmb_sock, dgram_sock;
98 /* Check if we are creating a non broadcast subnet - if so don't create
102 if(type != NORMAL_SUBNET)
110 * Attempt to open the sockets on port 137/138 for this interface
112 * Fail the subnet creation if this fails.
115 if((nmb_sock = open_socket_in(SOCK_DGRAM, global_nmb_port,0, myip.s_addr)) == -1)
117 DEBUG(0,("make_subnet: Failed to open nmb socket on interface %s \
118 for port %d. Error was %s\n", inet_ntoa(myip), global_nmb_port, strerror(errno)));
122 if((dgram_sock = open_socket_in(SOCK_DGRAM,DGRAM_PORT,3, myip.s_addr)) == -1)
124 DEBUG(0,("make_subnet: Failed to open dgram socket on interface %s \
125 for port %d. Error was %s\n", inet_ntoa(myip), DGRAM_PORT, strerror(errno)));
129 /* Make sure we can broadcast from these sockets. */
130 set_socket_options(nmb_sock,"SO_BROADCAST");
131 set_socket_options(dgram_sock,"SO_BROADCAST");
135 subrec = (struct subnet_record *)malloc(sizeof(*subrec));
139 DEBUG(0,("make_subnet: malloc fail !\n"));
145 bzero( (char *)subrec, sizeof(*subrec) );
146 (void)ubi_trInitTree( subrec->namelist,
147 namelist_entry_compare,
150 if((subrec->subnet_name = strdup(name)) == NULL)
152 DEBUG(0,("make_subnet: malloc fail for subnet name !\n"));
155 free((char *)subrec);
159 DEBUG(2, ("making subnet name:%s ", name ));
160 DEBUG(2, ("Broadcast address:%s ", inet_ntoa(bcast_ip)));
161 DEBUG(2, ("Subnet mask:%s\n", inet_ntoa(mask_ip)));
163 subrec->namelist_changed = False;
164 subrec->work_changed = False;
166 subrec->bcast_ip = bcast_ip;
167 subrec->mask_ip = mask_ip;
170 subrec->nmb_sock = nmb_sock;
171 subrec->dgram_sock = dgram_sock;
176 /****************************************************************************
177 Create subnet entries.
178 **************************************************************************/
180 BOOL create_subnets(void)
182 int num_interfaces = iface_count();
184 struct in_addr unicast_ip;
186 if(num_interfaces == 0)
188 DEBUG(0,("create_subnets: No local interfaces !\n"));
193 * Create subnets from all the local interfaces and thread them onto
197 for (i = 0 ; i < num_interfaces; i++)
199 struct subnet_record *subrec;
200 struct interface *iface = get_interface(i);
202 if((subrec = make_subnet(inet_ntoa(iface->ip), NORMAL_SUBNET,
203 iface->ip, iface->bcast,iface->nmask)) == NULL)
209 * If we have been configured to use a WINS server, then try and
210 * get the ip address of it here. If we are the WINS server then
211 * set the unicast subnet address to be the first of our own real
215 if(*lp_wins_server())
217 struct in_addr real_wins_ip;
218 real_wins_ip = *interpret_addr2(lp_wins_server());
220 if (!zero_ip(real_wins_ip))
222 unicast_ip = real_wins_ip;
226 /* The smb.conf's wins server parameter MUST be a host_name
228 DEBUG(0,("invalid smb.conf parameter 'wins server'\n"));
232 else if(lp_we_are_a_wins_server())
234 /* Pick the first interface ip address as the WINS server ip. */
235 unicast_ip = *iface_n_ip(0);
239 /* We should not be using a WINS server at all. Set the
240 ip address of the subnet to be zero. */
245 * Create the unicast and remote broadcast subnets.
246 * Don't put these onto the linked list.
247 * The ip address of the unicast subnet is set to be
248 * the WINS server address, if it exists, or ipzero if not.
251 unicast_subnet = make_subnet( "UNICAST_SUBNET", UNICAST_SUBNET,
252 unicast_ip, unicast_ip, unicast_ip);
254 remote_broadcast_subnet = make_subnet( "REMOTE_BROADCAST_SUBNET",
255 REMOTE_BROADCAST_SUBNET,
256 ipzero, ipzero, ipzero);
258 if((unicast_subnet == NULL) || (remote_broadcast_subnet == NULL))
262 * If we are WINS server, create the WINS_SERVER_SUBNET - don't put on
266 if (lp_we_are_a_wins_server())
268 if((wins_server_subnet = make_subnet("WINS_SERVER_SUBNET",
270 ipzero, ipzero, ipzero)) == NULL)
277 /*******************************************************************
278 Function to tell us if we can use the unicast subnet.
279 ******************************************************************/
281 BOOL we_are_a_wins_client(void)
283 static int cache_we_are_a_wins_client = -1;
285 if(cache_we_are_a_wins_client == -1)
286 cache_we_are_a_wins_client = (ip_equal(ipzero, unicast_subnet->myip) ?
289 return cache_we_are_a_wins_client;
292 /*******************************************************************
293 Access function used by NEXT_SUBNET_INCLUDING_UNICAST
294 ******************************************************************/
296 struct subnet_record *get_next_subnet_maybe_unicast(struct subnet_record *subrec)
298 if(subrec == unicast_subnet)
300 else if((subrec->next == NULL) && we_are_a_wins_client())
301 return unicast_subnet;
306 /*******************************************************************
307 Access function used by retransmit_or_expire_response_records() in
308 nmbd_packets.c. Patch from Andrey Alekseyev <fetch@muffin.arcadia.spb.ru>
309 Needed when we need to enumerate all the broadcast, unicast and
311 ******************************************************************/
313 struct subnet_record *get_next_subnet_maybe_unicast_or_wins_server(struct subnet_record *subrec)
315 if(subrec == unicast_subnet)
317 if(wins_server_subnet)
318 return wins_server_subnet;
323 if(wins_server_subnet && subrec == wins_server_subnet)
326 if((subrec->next == NULL) && we_are_a_wins_client())
327 return unicast_subnet;