2 Unix SMB/Netbios implementation.
4 NBT netbios routines and daemon - version 2
5 Copyright (C) Andrew Tridgell 1994-1998
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;
39 int global_nmb_port = -1;
41 extern pstring myhostname;
42 static pstring host_file;
43 extern pstring myname;
44 extern fstring myworkgroup;
45 extern char **my_netbios_names;
47 /* are we running as a daemon ? */
48 static BOOL is_daemon = False;
50 /* have we found LanMan clients yet? */
51 BOOL found_lm_clients = False;
53 /* what server type are we currently */
55 time_t StartupTime = 0;
57 extern struct in_addr ipzero;
59 /**************************************************************************** **
61 **************************************************************************** */
64 BlockSignals(True,SIGTERM);
66 DEBUG(0,("Got SIGTERM: going down...\n"));
68 /* Write out wins.dat file if samba is a WINS server */
69 wins_write_database();
71 /* Remove all SELF registered names. */
74 /* Announce all server entries as 0 time-to-live, 0 type. */
75 announce_my_servers_removed();
77 /* If there was an async dns child - kill it. */
78 kill_async_dns_child();
82 /* Keep compiler happy.. */
86 /**************************************************************************** **
88 **************************************************************************** */
89 static int sig_hup(void)
91 BlockSignals( True, SIGHUP );
93 DEBUG( 0, ( "Got SIGHUP dumping debug info.\n" ) );
95 write_browse_list( 0, True );
98 reload_services( True );
102 BlockSignals(False,SIGHUP);
103 #ifndef DONT_REINSTALL_SIG
104 signal(SIGHUP,SIGNAL_CAST sig_hup);
109 /**************************************************************************** **
111 **************************************************************************** */
112 static int sig_pipe(void)
114 BlockSignals( True, SIGPIPE );
116 DEBUG( 0, ("Got SIGPIPE\n") );
119 BlockSignals( False, SIGPIPE );
124 /**************************************************************************** **
125 prepare to dump a core file - carefully!
126 **************************************************************************** */
127 static BOOL dump_core(void)
131 pstrcpy( dname, debugf );
132 if ((p=strrchr(dname,'/')))
134 strcat( dname, "/corefiles" );
135 mkdir( dname, 0700 );
136 sys_chown( dname, getuid(), getgid() );
137 chmod( dname, 0700 );
146 getrlimit( RLIMIT_CORE, &rlp );
147 rlp.rlim_cur = MAX( 4*1024*1024, rlp.rlim_cur );
148 setrlimit( RLIMIT_CORE, &rlp );
149 getrlimit( RLIMIT_CORE, &rlp );
150 DEBUG( 3, ( "Core limits now %d %d\n", rlp.rlim_cur, rlp.rlim_max ) );
156 DEBUG( 0, ( "Dumping core in %s\n",dname ) );
162 /**************************************************************************** **
163 possibly continue after a fault
164 **************************************************************************** */
165 static void fault_continue(void)
170 } /* fault_continue */
172 /**************************************************************************** **
173 expire old names from the namelist and server list
174 **************************************************************************** */
175 static void expire_names_and_servers(time_t t)
177 static time_t lastrun = 0;
181 if ( t < (lastrun + 5) )
186 * Expire any timed out names on all the broadcast
187 * subnets and those registered with the WINS server.
188 * (nmbd_namelistdb.c)
193 * Go through all the broadcast subnets and for each
194 * workgroup known on that subnet remove any expired
195 * server names. If a workgroup has an empty serverlist
196 * and has itself timed out then remove the workgroup.
197 * (nmbd_workgroupdb.c)
199 expire_workgroups_and_servers(t);
200 } /* expire_names_and_servers */
202 /**************************************************************************** **
203 reload the services file
204 **************************************************************************** */
205 BOOL reload_services(BOOL test)
208 extern fstring remote_machine;
210 strcpy( remote_machine, "nmb" );
215 pstrcpy( fname,lp_configfile());
216 if (file_exist(fname,NULL) && !strcsequal(fname,servicesf))
218 pstrcpy(servicesf,fname);
223 if ( test && !lp_file_list_changed() )
226 ret = lp_load( servicesf, True , False, False);
228 /* perhaps the config filename is now set */
231 DEBUG( 3, ( "services not loaded\n" ) );
232 reload_services( True );
235 /* Do a sanity check for a misconfigured nmbd */
236 if( lp_wins_support() && *lp_wins_server() )
238 DEBUG(0,("ERROR: both 'wins support = true' and 'wins server = <server>' \
239 cannot be set in the smb.conf file. nmbd aborting.\n"));
244 } /* reload_services */
246 /**************************************************************************** **
247 The main select loop.
248 **************************************************************************** */
249 static void process(void)
255 time_t t = time(NULL);
258 * Check all broadcast subnets to see if
259 * we need to run an election on any of them.
262 run_election = check_elections();
265 * Read incoming UDP packets.
268 if(listen_for_packets(run_election))
272 * Process all incoming packets
273 * read above. This calls the success and
274 * failure functions registered when response
275 * packets arrrive, and also deals with request
276 * packets from other sources.
282 * Run any elections - initiate becoming
283 * a local master browser if we have won.
289 * Send out any broadcast announcements
290 * of our server names. This also announces
291 * the workgroup name if we are a local
293 * (nmbd_sendannounce.c)
295 announce_my_server_names(t);
298 * Send out any LanMan broadcast announcements
299 * of our server names.
300 * (nmbd_sendannounce.c)
302 announce_my_lm_server_names(t);
305 * If we are a local master browser, periodically
306 * announce ourselves to the domain master browser.
307 * This also deals with syncronising the domain master
308 * browser server lists with ourselves as a local
310 * (nmbd_sendannounce.c)
312 announce_myself_to_domain_master_browser(t);
315 * Fullfill any remote announce requests.
316 * (nmbd_sendannounce.c)
321 * Fullfill any remote browse sync announce requests.
322 * (nmbd_sendannounce.c)
324 browse_sync_remote(t);
327 * Scan the broadcast subnets, and WINS client
328 * namelists and refresh any that need refreshing.
334 * Scan the subnet namelists and server lists and
335 * expire thos that have timed out.
338 expire_names_and_servers(t);
341 * Write out a snapshot of our current browse list into
342 * the browse.dat file. This is used by smbd to service
343 * incoming NetServerEnum calls - used to synchronise
344 * browse lists over subnets.
345 * (nmbd_serverlistdb.c)
347 write_browse_list(t, False);
350 * If we are a domain master browser, we have a list of
351 * local master browsers we should synchronise browse
352 * lists with (these are added by an incoming local
353 * master browser announcement packet). Expire any of
354 * these that are no longer current, and pull the server
355 * lists from each of these known local master browsers.
356 * (nmbd_browsesync.c)
358 dmb_expire_and_sync_browser_lists(t);
361 * Check that there is a local master browser for our
362 * workgroup for all our broadcast subnets. If one
363 * is not found, start an election (which we ourselves
364 * may or may not participate in, depending on the
365 * setting of the 'local master' parameter.
368 check_master_browser_exists(t);
371 * If we are configured as a logon server, attempt to
372 * register the special NetBIOS names to become such
373 * (WORKGROUP<1c> name) on all broadcast subnets and
374 * with the WINS server (if used). If we are configured
375 * to become a domain master browser, attempt to register
376 * the special NetBIOS name (WORKGROUP<1b> name) to
378 * (nmbd_become_dmb.c)
383 * If we are a WINS server, do any timer dependent
384 * processing required.
385 * (nmbd_winsserver.c)
387 initiate_wins_processing(t);
390 * If we are a domain master browser, attempt to contact the
391 * WINS server to get a list of all known WORKGROUPS/DOMAINS.
392 * This will only work to a Samba WINS server.
393 * (nmbd_browsesync.c)
395 collect_all_workgroup_names_from_wins_server(t);
398 * Go through the response record queue and time out or re-transmit
399 * and expired entries.
402 retransmit_or_expire_response_records(t);
407 /**************************************************************************** **
408 open the socket communication
409 **************************************************************************** */
410 static BOOL open_sockets(BOOL isdaemon, int port)
412 /* The sockets opened here will be used to receive broadcast
413 packets *only*. Interface specific sockets are opened in
414 make_subnet() in namedbsubnet.c. Thus we bind to the
415 address "0.0.0.0". The parameter 'socket address' is
420 ClientNMB = open_socket_in(SOCK_DGRAM, port,0,0);
424 ClientDGRAM = open_socket_in(SOCK_DGRAM,DGRAM_PORT,3,0);
426 if ( ClientNMB == -1 )
429 signal( SIGPIPE, SIGNAL_CAST sig_pipe );
431 set_socket_options( ClientNMB, "SO_BROADCAST" );
432 set_socket_options( ClientDGRAM, "SO_BROADCAST" );
434 DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
439 /**************************************************************************** **
440 initialise connect, service and file structs
441 **************************************************************************** */
442 static BOOL init_structs()
444 extern fstring local_machine;
453 fstrcpy( myname, myhostname );
454 p = strchr( myname, '.' );
460 /* Add any NETBIOS name aliases. Ensure that the first entry
463 /* Work out the max number of netbios aliases that we have */
464 ptr = lp_netbios_aliases();
465 for( namecount=0; next_token(&ptr,nbname,NULL); namecount++ )
470 /* Allocate space for the netbios aliases */
471 my_netbios_names = (char **)malloc( sizeof(char *) * (namecount+1) );
472 if( NULL == my_netbios_names )
474 DEBUG( 0, ( "init_structs: malloc fail.\n" ) );
478 /* Use the myname string first */
481 my_netbios_names[namecount++] = myname;
483 ptr = lp_netbios_aliases();
484 while ( next_token( &ptr, nbname, NULL ) )
487 /* Look for duplicates */
489 for( n=0; n<namecount; n++ )
491 if( 0 == strcmp( nbname, my_netbios_names[n] ) )
495 my_netbios_names[namecount++] = strdup( nbname );
498 /* Check the strdups succeeded. */
499 for( n = 0; n < namecount; n++ )
500 if( NULL == my_netbios_names[n] )
502 DEBUG(0,("init_structs: malloc fail when allocating names.\n"));
506 /* Terminate name list */
507 my_netbios_names[namecount++] = NULL;
509 fstrcpy( local_machine, myname );
510 trim_string( local_machine, " ", " " );
511 p = strchr( local_machine, ' ' );
514 strlower( local_machine );
516 DEBUG( 5, ("Netbios name list:-\n") );
517 for( n=0; my_netbios_names[n]; n++ )
518 DEBUG( 5, ( "my_netbios_names[%d]=\"%s\"\n", n, my_netbios_names[n] ) );
523 /**************************************************************************** **
525 **************************************************************************** */
526 static void usage(char *pname)
528 DEBUG(0,("Incorrect program usage - is the command line correct?\n"));
530 printf( "Usage: %s [-n name] [-D] [-p port] [-d debuglevel] ", pname );
531 printf( "[-l log basename]\n" );
532 printf( "Version %s\n", VERSION );
533 printf( "\t-D become a daemon\n" );
534 printf( "\t-p port listen on the specified port\n" );
535 printf( "\t-d debuglevel set the debuglevel\n" );
536 printf( "\t-l log basename. Basename for log/debug files\n" );
537 printf( "\t-n netbiosname. " );
538 printf( "the netbios name to advertise for this host\n");
539 printf( "\t-H hosts file load a netbios hosts file\n" );
544 /**************************************************************************** **
546 **************************************************************************** */
547 int main(int argc,char *argv[])
552 char pidFile[100] = { 0 };
554 global_nmb_port = NMB_PORT;
557 StartupTime = time(NULL);
561 strcpy( debugf, NMBLOGFILE );
563 setup_logging( argv[0], False );
565 charset_initialise();
568 strcpy( host_file, LMHOSTSFILE );
571 /* this is for people who can't start the program correctly */
572 while (argc > 1 && (*argv[1] != '-'))
578 fault_setup( fault_continue );
580 signal( SIGHUP, SIGNAL_CAST sig_hup );
581 signal( SIGTERM, SIGNAL_CAST sig_term );
583 /* Setup the signals that allow the debug log level
584 to by dynamically changed. */
586 /* If we are using the malloc debug code we can't use
587 SIGUSR1 and SIGUSR2 to do debug level changes. */
590 signal( SIGUSR1, SIGNAL_CAST sig_usr1 );
594 signal( SIGUSR2, SIGNAL_CAST sig_usr2 );
598 while((opt = getopt(argc, argv, "as:T:I:C:bAi:B:N:Rn:l:d:Dp:hSH:G:f:")) != EOF)
603 strncpy(pidFile, optarg, sizeof(pidFile));
606 pstrcpy(servicesf,optarg);
613 DEBUG(0,("Obsolete option '%c' used\n",opt));
616 pstrcpy(host_file,optarg);
619 pstrcpy(myname,optarg);
623 sprintf(debugf,"%s.nmb",optarg);
626 pstrcpy(scope,optarg);
631 extern BOOL append_log;
632 append_log = !append_log;
639 DEBUGLEVEL = atoi(optarg);
642 global_nmb_port = atoi(optarg);
657 DEBUG(1,("%s netbios nameserver version %s started\n",timestring(),VERSION));
658 DEBUG(1,("Copyright Andrew Tridgell 1994-1997\n"));
660 if( !get_myname( myhostname, NULL) )
662 DEBUG(0,("Unable to get my hostname - exiting.\n"));
666 if ( !reload_services(False) )
669 codepage_initialise(lp_client_code_page());
674 reload_services( True );
676 fstrcpy( myworkgroup, lp_workgroup() );
678 if (strequal(myworkgroup,"*"))
680 DEBUG(0,("ERROR: a workgroup name of * is no longer supported\n"));
686 if (!is_daemon && !is_a_socket(0))
688 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
694 DEBUG(2,("%s becoming a daemon\n",timestring()));
698 if (!directory_exist(lp_lockdir(), NULL))
700 mkdir(lp_lockdir(), 0755);
709 fd = open( pidFile, O_NONBLOCK | O_CREAT | O_WRONLY | O_TRUNC, 0644 );
711 fd = open( pidFile, O_CREAT | O_WRONLY | O_TRUNC, 0644 );
715 DEBUG(0,("ERROR: can't open %s: %s\n", pidFile, strerror(errno)));
718 if (fcntl_lock(fd,F_SETLK,0,1,F_WRLCK)==False)
720 DEBUG(0,("ERROR: nmbd is already running\n"));
723 sprintf(buf, "%u\n", (unsigned int) getpid());
724 if (write(fd, buf, strlen(buf)) < 0)
726 DEBUG(0,("ERROR: can't write to %s: %s\n", pidFile, strerror(errno)));
729 /* Leave pid file open & locked for the duration... */
733 DEBUG( 3, ( "Opening sockets %d\n", global_nmb_port ) );
735 if ( !open_sockets( is_daemon, global_nmb_port ) )
738 /* Determine all the IP addresses we have. */
741 /* Create an nmbd subnet record for each of the above. */
742 if( False == create_subnets() )
744 DEBUG(0,("ERROR: Failed when creating subnet lists. Exiting.\n"));
748 /* Load in any static local names. */
751 load_lmhosts_file(host_file);
752 DEBUG(3,("Loaded hosts file\n"));
755 /* If we are acting as a WINS server, initialise data structures. */
756 if( !initialise_wins() )
758 DEBUG( 0, ( "nmbd: Failed when initialising WINS server.\n" ) );
763 * Register nmbd primary workgroup and nmbd names on all
764 * the broadcast subnets, and on the WINS server (if specified).
765 * Also initiate the startup of our primary workgroup (start
766 * elections if we are setup as being able to be a local
770 if( False == register_my_workgroup_and_names() )
772 DEBUG(0,("ERROR: Failed when creating my my workgroup. Exiting.\n"));
776 /* We can only take signals in the select. */
777 BlockSignals( True, SIGTERM );
779 BlockSignals( True, SIGUSR1);
782 BlockSignals( True, SIGUSR2);
793 /* ========================================================================== */