2 Unix SMB/Netbios implementation.
4 NBT netbios routines and daemon - version 2
5 Copyright (C) Andrew Tridgell 1994-1997
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;
43 extern fstring myworkgroup;
45 /* are we running as a daemon ? */
46 static BOOL is_daemon = False;
48 /* what server type are we currently */
50 time_t StartupTime =0;
52 extern struct in_addr ipzero;
54 /****************************************************************************
56 ****************************************************************************/
59 BlockSignals(True,SIGTERM);
61 DEBUG(0,("Got SIGTERM: going down...\n"));
63 /* write out wins.dat file if samba is a WINS server */
66 /* remove all samba names, with wins server if necessary. */
69 /* announce all server entries as 0 time-to-live, 0 type */
70 /* XXXX don't care if we never receive a response back... yet */
71 announce_my_servers_removed();
73 /* XXXX other things: if we are a master browser, force an election? */
76 /* Keep compiler happy.. */
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(time_t t)
167 static time_t lastrun = 0;
169 if (!lastrun) lastrun = t;
170 if (t < lastrun + 5) return;
177 /*****************************************************************************
178 reload the services file
179 **************************************************************************/
180 BOOL reload_services(BOOL test)
183 extern fstring remote_machine;
185 strcpy(remote_machine,"nmbd");
190 strcpy(fname,lp_configfile());
191 if (file_exist(fname,NULL) && !strcsequal(fname,servicesf))
193 strcpy(servicesf,fname);
198 if (test && !lp_file_list_changed())
201 ret = lp_load(servicesf,True);
203 /* perhaps the config filename is now set */
205 DEBUG(3,("services not loaded\n"));
206 reload_services(True);
209 /* Do a sanity check for a misconfigured nmbd */
210 if(lp_wins_support() && *lp_wins_server()) {
211 DEBUG(0,("ERROR: both 'wins support = true' and 'wins server = <server>' \
212 cannot be set in the smb.conf file. nmbd aborting.\n"));
221 /****************************************************************************
222 load a netbios hosts file
223 ****************************************************************************/
224 static void load_hosts_file(char *fname)
226 FILE *f = fopen(fname,"r");
229 DEBUG(2,("Can't open lmhosts file %s\n",fname));
235 pstring ip,name,flags,extra;
236 struct subnet_record *d;
239 struct in_addr ipaddr;
240 enum name_source source = LMHOSTS;
242 if (!fgets_slash(line,sizeof(pstring),f)) continue;
244 if (*line == '#') continue;
252 if (next_token(&ptr,ip ,NULL)) ++count;
253 if (next_token(&ptr,name ,NULL)) ++count;
254 if (next_token(&ptr,flags,NULL)) ++count;
255 if (next_token(&ptr,extra,NULL)) ++count;
257 if (count <= 0) continue;
259 if (count > 0 && count < 2) {
260 DEBUG(0,("Ill formed hosts line [%s]\n",line));
265 DEBUG(0,("too many columns in %s (obsolete syntax)\n",fname));
269 DEBUG(4, ("lmhost entry: %s %s %s\n", ip, name, flags));
271 if (strchr(flags,'G') || strchr(flags,'S')) {
272 DEBUG(0,("group flag in %s ignored (obsolete)\n",fname));
276 if (strchr(flags,'M')) {
281 ipaddr = *interpret_addr2(ip);
282 d = find_subnet_all(ipaddr);
284 add_netbios_entry(d,name,0x00,NB_ACTIVE,0,source,ipaddr,True,True);
285 add_netbios_entry(d,name,0x20,NB_ACTIVE,0,source,ipaddr,True,True);
293 /****************************************************************************
294 The main select loop.
295 ***************************************************************************/
296 static void process(void)
302 time_t t = time(NULL);
303 run_election = check_elections();
304 listen_for_packets(run_election);
313 query_refresh_names(t);
315 expire_names_and_servers(t);
316 expire_netbios_response_entries(t);
319 write_browse_list(t);
321 check_master_browser(t);
327 /****************************************************************************
328 open the socket communication
329 ****************************************************************************/
330 static BOOL open_sockets(BOOL isdaemon, int port)
335 if ((hp = Get_Hostbyname(myhostname)) == 0) {
336 DEBUG(0,( "Get_Hostbyname: Unknown host. %s\n",myhostname));
341 ClientNMB = open_socket_in(SOCK_DGRAM, port,0,interpret_addr(lp_socket_address()));
345 ClientDGRAM = open_socket_in(SOCK_DGRAM,DGRAM_PORT,3,interpret_addr(lp_socket_address()));
350 signal(SIGPIPE, SIGNAL_CAST sig_pipe);
352 set_socket_options(ClientNMB,"SO_BROADCAST");
353 set_socket_options(ClientDGRAM,"SO_BROADCAST");
355 DEBUG(3,("Sockets opened.\n"));
360 /****************************************************************************
361 initialise connect, service and file structs
362 ****************************************************************************/
363 static BOOL init_structs()
365 extern fstring local_machine;
369 strcpy(myname,myhostname);
370 p = strchr(myname,'.');
375 strcpy(local_machine,myname);
376 trim_string(local_machine," "," ");
377 p = strchr(local_machine,' ');
379 strlower(local_machine);
384 /****************************************************************************
386 ****************************************************************************/
387 static void usage(char *pname)
389 DEBUG(0,("Incorrect program usage - is the command line correct?\n"));
391 printf("Usage: %s [-n name] [-D] [-p port] [-d debuglevel] [-l log basename]\n",pname);
392 printf("Version %s\n",VERSION);
393 printf("\t-D become a daemon\n");
394 printf("\t-p port listen on the specified port\n");
395 printf("\t-d debuglevel set the debuglevel\n");
396 printf("\t-l log basename. Basename for log/debug files\n");
397 printf("\t-n netbiosname. the netbios name to advertise for this host\n");
398 printf("\t-H hosts file load a netbios hosts file\n");
403 /****************************************************************************
405 **************************************************************************/
406 int main(int argc,char *argv[])
412 char pidFile[100] = { 0 };
416 StartupTime = time(NULL);
420 strcpy(debugf,NMBLOGFILE);
422 setup_logging(argv[0],False);
424 charset_initialise();
427 strcpy(host_file,LMHOSTSFILE);
430 /* this is for people who can't start the program correctly */
431 while (argc > 1 && (*argv[1] != '-')) {
436 fault_setup(fault_continue);
438 signal(SIGHUP ,SIGNAL_CAST sig_hup);
439 signal(SIGTERM,SIGNAL_CAST sig_term);
441 while ((opt = getopt(argc, argv, "s:T:I:C:bAi:B:N:Rn:l:d:Dp:hSH:G:f:")) != EOF)
446 strncpy(pidFile, optarg, sizeof(pidFile));
449 strcpy(servicesf,optarg);
456 DEBUG(0,("Obsolete option '%c' used\n",opt));
459 strcpy(host_file,optarg);
462 strcpy(myname,optarg);
466 sprintf(debugf,"%s.nmb",optarg);
469 strcpy(scope,optarg);
476 DEBUGLEVEL = atoi(optarg);
486 if (!is_a_socket(0)) {
493 DEBUG(1,("%s netbios nameserver version %s started\n",timestring(),VERSION));
494 DEBUG(1,("Copyright Andrew Tridgell 1994\n"));
496 get_myname(myhostname,NULL);
498 if (!reload_services(False))
503 reload_services(True);
505 strcpy(myworkgroup, lp_workgroup());
509 if (!is_daemon && !is_a_socket(0)) {
510 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
515 DEBUG(2,("%s becoming a daemon\n",timestring()));
524 if ((fd = open(pidFile,
525 O_NONBLOCK | O_CREAT | O_WRONLY | O_TRUNC, 0644)) < 0)
527 DEBUG(0,("ERROR: can't open %s: %s\n", pidFile, strerror(errno)));
530 if (fcntl_lock(fd,F_SETLK,0,1,F_WRLCK)==False)
532 DEBUG(0,("ERROR: nmbd is already running\n"));
535 sprintf(buf, "%u\n", (unsigned int) getpid());
536 if (write(fd, buf, strlen(buf)) < 0)
538 DEBUG(0,("ERROR: can't write to %s: %s\n", pidFile, strerror(errno)));
541 /* Leave pid file open & locked for the duration... */
545 DEBUG(3,("Opening sockets %d\n", port));
547 if (!open_sockets(is_daemon,port)) return 1;
550 load_hosts_file(host_file);
551 DEBUG(3,("Loaded hosts file\n"));
555 add_my_subnets(myworkgroup);
559 if (strequal(myworkgroup,"*")) {
560 DEBUG(0,("ERROR: a workgroup name of * is no longer supported\n"));
564 DEBUG(3,("Checked names\n"));
566 load_netbios_names();
568 DEBUG(3,("Loaded names\n"));
570 write_browse_list(time(NULL));
572 DEBUG(3,("Dumped names\n"));
574 /* We can only take sigterm signals in the select. */
575 BlockSignals(True,SIGTERM);