2 Unix SMB/Netbios implementation.
4 NBT netbios routines and daemon - version 2
5 Copyright (C) Andrew Tridgell 1994-1995
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 14 jan 96: lkcl@pires.co.uk
24 added multiple workgroup domain master support
30 extern int DEBUGLEVEL;
32 extern pstring debugf;
33 pstring servicesf = CONFIGFILE;
40 extern pstring myhostname;
41 static pstring host_file;
42 extern pstring myname;
44 /* are we running as a daemon ? */
45 static BOOL is_daemon = False;
47 /* machine comment for host announcements */
48 pstring ServerComment="";
50 /* what server type are we currently */
52 time_t StartupTime =0;
54 extern struct in_addr ipzero;
56 /****************************************************************************
58 ****************************************************************************/
61 BlockSignals(True,SIGTERM);
63 DEBUG(0,("Got SIGTERM: going down...\n"));
65 /* write out wins.dat file if samba is a WINS server */
68 /* remove all samba names, with wins server if necessary. */
71 /* announce all server entries as 0 time-to-live, 0 type */
72 /* XXXX don't care if we never receive a response back... yet */
75 /* XXXX other things: if we are a master browser, force an election? */
81 /****************************************************************************
83 ****************************************************************************/
84 static int sig_hup(void)
86 BlockSignals(True,SIGHUP);
88 DEBUG(0,("Got SIGHUP (reload not implemented)\n"));
90 reload_services(True);
94 BlockSignals(False,SIGHUP);
95 #ifndef DONT_REINSTALL_SIG
96 signal(SIGHUP,SIGNAL_CAST sig_hup);
101 /****************************************************************************
103 ****************************************************************************/
104 static int sig_pipe(void)
106 BlockSignals(True,SIGPIPE);
108 DEBUG(0,("Got SIGPIPE\n"));
111 BlockSignals(False,SIGPIPE);
116 /*******************************************************************
117 prepare to dump a core file - carefully!
118 ********************************************************************/
119 static BOOL dump_core(void)
123 strcpy(dname,debugf);
124 if ((p=strrchr(dname,'/'))) *p=0;
125 strcat(dname,"/corefiles");
127 sys_chown(dname,getuid(),getgid());
129 if (chdir(dname)) return(False);
136 getrlimit(RLIMIT_CORE, &rlp);
137 rlp.rlim_cur = MAX(4*1024*1024,rlp.rlim_cur);
138 setrlimit(RLIMIT_CORE, &rlp);
139 getrlimit(RLIMIT_CORE, &rlp);
140 DEBUG(3,("Core limits now %d %d\n",rlp.rlim_cur,rlp.rlim_max));
146 DEBUG(0,("Dumping core in %s\n",dname));
152 /****************************************************************************
153 possibly continue after a fault
154 ****************************************************************************/
155 static void fault_continue(void)
162 /*******************************************************************
163 expire old names from the namelist and server list
164 ******************************************************************/
165 static void expire_names_and_servers(void)
167 static time_t lastrun = 0;
168 time_t t = time(NULL);
170 if (!lastrun) lastrun = t;
171 if (t < lastrun + 5) return;
178 /*****************************************************************************
179 reload the services file
180 **************************************************************************/
181 BOOL reload_services(BOOL test)
184 extern fstring remote_machine;
186 strcpy(remote_machine,"nmbd");
191 strcpy(fname,lp_configfile());
192 if (file_exist(fname,NULL) && !strcsequal(fname,servicesf))
194 strcpy(servicesf,fname);
199 if (test && !lp_file_list_changed())
202 ret = lp_load(servicesf,True);
204 /* perhaps the config filename is now set */
206 DEBUG(3,("services not loaded\n"));
207 reload_services(True);
211 add_subnet_interfaces();
218 /****************************************************************************
219 load a netbios hosts file
220 ****************************************************************************/
221 static void load_hosts_file(char *fname)
223 FILE *f = fopen(fname,"r");
226 DEBUG(2,("Can't open lmhosts file %s\n",fname));
232 if (!fgets_slash(line,sizeof(pstring),f)) continue;
234 if (*line == '#') continue;
239 pstring ip,name,mask,flags,extra;
243 struct in_addr ipaddr;
244 struct in_addr ipmask;
245 enum name_source source = LMHOSTS;
255 if (next_token(&ptr,ip ,NULL)) ++count;
256 if (next_token(&ptr,name ,NULL)) ++count;
257 if (next_token(&ptr,mask ,NULL)) ++count;
258 if (next_token(&ptr,flags,NULL)) ++count;
259 if (next_token(&ptr,extra,NULL)) ++count;
261 if (count <= 0) continue;
263 if (count > 0 && count < 2) {
264 DEBUG(0,("Ill formed hosts line [%s]\n",line));
268 /* work out if we need to shuffle the tokens along due to the
269 optional subnet mask argument */
271 if (strchr(mask, 'G') || strchr(mask, 'S') || strchr(mask, 'M')) {
272 strcpy(flags, mask );
273 /* default action for no subnet mask */
277 DEBUG(4, ("lmhost entry: %s %s %s %s\n", ip, name, mask, flags));
279 if (strchr(flags,'G') || strchr(flags,'S'))
282 if (strchr(flags,'M') && !group) {
287 ipaddr = *interpret_addr2(ip);
289 ipmask = *interpret_addr2(mask);
291 ipmask = *iface_nmask(ipaddr);
294 add_subnet_entry(ipaddr, ipmask, name, True, True);
296 struct subnet_record *d = find_subnet(ipaddr);
299 add_netbios_entry(d,name,0x00,NB_ACTIVE,0,source,ipaddr,True,True);
300 add_netbios_entry(d,name,0x20,NB_ACTIVE,0,source,ipaddr,True,True);
310 /****************************************************************************
311 The main select loop.
312 ***************************************************************************/
313 static void process(void)
319 time_t t = time(NULL);
320 run_election = check_elections();
321 listen_for_packets(run_election);
329 /* XXXX what was this stuff supposed to do? It sent
330 ANN_GetBackupListReq packets which I think should only be
331 sent when trying to find out who to browse with */
338 query_refresh_names();
340 expire_names_and_servers();
341 expire_netbios_response_entries();
346 check_master_browser();
351 /****************************************************************************
352 open the socket communication
353 ****************************************************************************/
354 static BOOL open_sockets(BOOL isdaemon, int port)
359 if ((hp = Get_Hostbyname(myhostname)) == 0) {
360 DEBUG(0,( "Get_Hostbyname: Unknown host. %s\n",myhostname));
365 ClientNMB = open_socket_in(SOCK_DGRAM, port,0);
369 ClientDGRAM = open_socket_in(SOCK_DGRAM,DGRAM_PORT,3);
374 signal(SIGPIPE, SIGNAL_CAST sig_pipe);
376 set_socket_options(ClientNMB,"SO_BROADCAST");
377 set_socket_options(ClientDGRAM,"SO_BROADCAST");
379 DEBUG(3,("Sockets opened.\n"));
384 /****************************************************************************
385 initialise connect, service and file structs
386 ****************************************************************************/
387 static BOOL init_structs()
389 if (!get_myname(myhostname,NULL))
394 strcpy(myname,myhostname);
395 p = strchr(myname,'.');
402 /****************************************************************************
404 ****************************************************************************/
405 static void usage(char *pname)
407 DEBUG(0,("Incorrect program usage - is the command line correct?\n"));
409 printf("Usage: %s [-n name] [-B bcast address] [-D] [-p port] [-d debuglevel] [-l log basename]\n",pname);
410 printf("Version %s\n",VERSION);
411 printf("\t-D become a daemon\n");
412 printf("\t-p port listen on the specified port\n");
413 printf("\t-d debuglevel set the debuglevel\n");
414 printf("\t-l log basename. Basename for log/debug files\n");
415 printf("\t-n netbiosname. the netbios name to advertise for this host\n");
416 printf("\t-B broadcast address the address to use for broadcasts\n");
417 printf("\t-N netmask the netmask to use for subnet determination\n");
418 printf("\t-H hosts file load a netbios hosts file\n");
419 printf("\t-G group name add a group name to be part of\n");
420 printf("\t-I ip-address override the IP address\n");
421 printf("\t-C comment sets the machine comment that appears in browse lists\n");
426 /****************************************************************************
428 **************************************************************************/
429 int main(int argc,char *argv[])
440 StartupTime = time(NULL);
444 strcpy(debugf,NMBLOGFILE);
446 setup_logging(argv[0],False);
448 charset_initialise();
451 strcpy(host_file,LMHOSTSFILE);
454 /* this is for people who can't start the program correctly */
455 while (argc > 1 && (*argv[1] != '-')) {
460 fault_setup(fault_continue);
462 signal(SIGHUP ,SIGNAL_CAST sig_hup);
463 signal(SIGTERM,SIGNAL_CAST sig_term);
465 while ((opt = getopt(argc, argv, "s:T:I:C:bAi:B:N:Rn:l:d:Dp:hSH:G:")) != EOF)
470 strcpy(servicesf,optarg);
473 strcpy(ServerComment,optarg);
476 strcpy(group,optarg);
479 strcpy(host_file,optarg);
482 iface_set_default(optarg,NULL,NULL);
485 iface_set_default(NULL,optarg,NULL);
488 iface_set_default(NULL,NULL,optarg);
491 strcpy(myname,optarg);
494 sprintf(debugf,"%s.nmb",optarg);
497 strcpy(scope,optarg);
504 DEBUGLEVEL = atoi(optarg);
514 if (!is_a_socket(0)) {
521 DEBUG(1,("%s netbios nameserver version %s started\n",timestring(),VERSION));
522 DEBUG(1,("Copyright Andrew Tridgell 1994\n"));
526 if (!reload_services(False))
532 add_my_subnets(group);
534 if (!is_daemon && !is_a_socket(0)) {
535 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
540 DEBUG(2,("%s becoming a daemon\n",timestring()));
544 DEBUG(3,("Opening sockets %d\n", port));
546 if (!open_sockets(is_daemon,port)) return 1;
549 load_hosts_file(host_file);
550 DEBUG(3,("Loaded hosts file\n"));
556 strcpy(ServerComment,"Samba %v");
557 string_sub(ServerComment,"%v",VERSION);
558 string_sub(ServerComment,"%h",myhostname);
561 add_my_subnets(lp_workgroup());
563 DEBUG(3,("Checked names\n"));
565 load_netbios_names();
567 DEBUG(3,("Loaded names\n"));
571 DEBUG(3,("Dumped names\n"));