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 global_myname;
44 extern fstring global_myworkgroup;
45 extern char **my_netbios_names;
47 extern BOOL global_in_nmbd;
49 /* are we running as a daemon ? */
50 static BOOL is_daemon = False;
52 /* have we found LanMan clients yet? */
53 BOOL found_lm_clients = False;
55 /* what server type are we currently */
57 time_t StartupTime = 0;
59 extern struct in_addr ipzero;
61 /**************************************************************************** **
63 **************************************************************************** */
64 static void sig_term(int sig)
66 BlockSignals(True,SIGTERM);
68 DEBUG(0,("Got SIGTERM: going down...\n"));
70 /* Write out wins.dat file if samba is a WINS server */
71 wins_write_database();
73 /* Remove all SELF registered names. */
76 /* Announce all server entries as 0 time-to-live, 0 type. */
77 announce_my_servers_removed();
79 /* If there was an async dns child - kill it. */
80 kill_async_dns_child();
86 /**************************************************************************** **
88 **************************************************************************** */
89 static void sig_hup(int sig)
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);
106 /**************************************************************************** **
108 **************************************************************************** */
109 static void sig_pipe(int sig)
111 BlockSignals( True, SIGPIPE );
113 DEBUG( 0, ("Got SIGPIPE\n") );
115 BlockSignals( False, SIGPIPE );
119 /**************************************************************************** **
120 prepare to dump a core file - carefully!
121 **************************************************************************** */
122 static BOOL dump_core(void)
126 pstrcpy( dname, debugf );
127 if ((p=strrchr(dname,'/')))
129 pstrcat( dname, "/corefiles" );
130 mkdir( dname, 0700 );
131 sys_chown( dname, getuid(), getgid() );
132 chmod( dname, 0700 );
137 #ifdef HAVE_GETRLIMIT
141 getrlimit( RLIMIT_CORE, &rlp );
142 rlp.rlim_cur = MAX( 4*1024*1024, rlp.rlim_cur );
143 setrlimit( RLIMIT_CORE, &rlp );
144 getrlimit( RLIMIT_CORE, &rlp );
145 DEBUG( 3, ( "Core limits now %d %d\n", (int)rlp.rlim_cur, (int)rlp.rlim_max ) );
151 DEBUG(0,("Dumping core in %s\n",dname));
158 /**************************************************************************** **
159 possibly continue after a fault
160 **************************************************************************** */
161 static void fault_continue(void)
166 } /* fault_continue */
168 /**************************************************************************** **
169 expire old names from the namelist and server list
170 **************************************************************************** */
171 static void expire_names_and_servers(time_t t)
173 static time_t lastrun = 0;
177 if ( t < (lastrun + 5) )
182 * Expire any timed out names on all the broadcast
183 * subnets and those registered with the WINS server.
184 * (nmbd_namelistdb.c)
189 * Go through all the broadcast subnets and for each
190 * workgroup known on that subnet remove any expired
191 * server names. If a workgroup has an empty serverlist
192 * and has itself timed out then remove the workgroup.
193 * (nmbd_workgroupdb.c)
195 expire_workgroups_and_servers(t);
196 } /* expire_names_and_servers */
198 /**************************************************************************** **
199 reload the services file
200 **************************************************************************** */
201 BOOL reload_services(BOOL test)
204 extern fstring remote_machine;
206 fstrcpy( remote_machine, "nmb" );
211 pstrcpy( fname,lp_configfile());
212 if (file_exist(fname,NULL) && !strcsequal(fname,servicesf))
214 pstrcpy(servicesf,fname);
219 if ( test && !lp_file_list_changed() )
222 ret = lp_load( servicesf, True , False, False);
224 /* perhaps the config filename is now set */
227 DEBUG( 3, ( "services not loaded\n" ) );
228 reload_services( True );
231 /* Do a sanity check for a misconfigured nmbd */
232 if( lp_wins_support() && *lp_wins_server() )
234 DEBUG(0,("ERROR: both 'wins support = true' and 'wins server = <server>' \
235 cannot be set in the smb.conf file. nmbd aborting.\n"));
240 } /* reload_services */
242 /**************************************************************************** **
243 The main select loop.
244 **************************************************************************** */
245 static void process(void)
251 time_t t = time(NULL);
254 * Check all broadcast subnets to see if
255 * we need to run an election on any of them.
258 run_election = check_elections();
261 * Read incoming UDP packets.
264 if(listen_for_packets(run_election))
268 * Process all incoming packets
269 * read above. This calls the success and
270 * failure functions registered when response
271 * packets arrrive, and also deals with request
272 * packets from other sources.
278 * Run any elections - initiate becoming
279 * a local master browser if we have won.
285 * Send out any broadcast announcements
286 * of our server names. This also announces
287 * the workgroup name if we are a local
289 * (nmbd_sendannounce.c)
291 announce_my_server_names(t);
294 * Send out any LanMan broadcast announcements
295 * of our server names.
296 * (nmbd_sendannounce.c)
298 announce_my_lm_server_names(t);
301 * If we are a local master browser, periodically
302 * announce ourselves to the domain master browser.
303 * This also deals with syncronising the domain master
304 * browser server lists with ourselves as a local
306 * (nmbd_sendannounce.c)
308 announce_myself_to_domain_master_browser(t);
311 * Fullfill any remote announce requests.
312 * (nmbd_sendannounce.c)
317 * Fullfill any remote browse sync announce requests.
318 * (nmbd_sendannounce.c)
320 browse_sync_remote(t);
323 * Scan the broadcast subnets, and WINS client
324 * namelists and refresh any that need refreshing.
330 * Scan the subnet namelists and server lists and
331 * expire thos that have timed out.
334 expire_names_and_servers(t);
337 * Write out a snapshot of our current browse list into
338 * the browse.dat file. This is used by smbd to service
339 * incoming NetServerEnum calls - used to synchronise
340 * browse lists over subnets.
341 * (nmbd_serverlistdb.c)
343 write_browse_list(t, False);
346 * If we are a domain master browser, we have a list of
347 * local master browsers we should synchronise browse
348 * lists with (these are added by an incoming local
349 * master browser announcement packet). Expire any of
350 * these that are no longer current, and pull the server
351 * lists from each of these known local master browsers.
352 * (nmbd_browsesync.c)
354 dmb_expire_and_sync_browser_lists(t);
357 * Check that there is a local master browser for our
358 * workgroup for all our broadcast subnets. If one
359 * is not found, start an election (which we ourselves
360 * may or may not participate in, depending on the
361 * setting of the 'local master' parameter.
364 check_master_browser_exists(t);
367 * If we are configured as a logon server, attempt to
368 * register the special NetBIOS names to become such
369 * (WORKGROUP<1c> name) on all broadcast subnets and
370 * with the WINS server (if used). If we are configured
371 * to become a domain master browser, attempt to register
372 * the special NetBIOS name (WORKGROUP<1b> name) to
374 * (nmbd_become_dmb.c)
379 * If we are a WINS server, do any timer dependent
380 * processing required.
381 * (nmbd_winsserver.c)
383 initiate_wins_processing(t);
386 * If we are a domain master browser, attempt to contact the
387 * WINS server to get a list of all known WORKGROUPS/DOMAINS.
388 * This will only work to a Samba WINS server.
389 * (nmbd_browsesync.c)
391 collect_all_workgroup_names_from_wins_server(t);
394 * Go through the response record queue and time out or re-transmit
395 * and expired entries.
398 retransmit_or_expire_response_records(t);
401 * check to see if any remote browse sync child processes have completed
403 sync_check_completion();
406 * regularly sync with any other DMBs we know about
413 /**************************************************************************** **
414 open the socket communication
415 **************************************************************************** */
416 static BOOL open_sockets(BOOL isdaemon, int port)
418 /* The sockets opened here will be used to receive broadcast
419 packets *only*. Interface specific sockets are opened in
420 make_subnet() in namedbsubnet.c. Thus we bind to the
421 address "0.0.0.0". The parameter 'socket address' is
426 ClientNMB = open_socket_in(SOCK_DGRAM, port,0,0);
430 ClientDGRAM = open_socket_in(SOCK_DGRAM,DGRAM_PORT,3,0);
432 if ( ClientNMB == -1 )
435 CatchSignal( SIGPIPE, SIGNAL_CAST sig_pipe );
437 set_socket_options( ClientNMB, "SO_BROADCAST" );
438 set_socket_options( ClientDGRAM, "SO_BROADCAST" );
440 DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
445 /**************************************************************************** **
446 initialise connect, service and file structs
447 **************************************************************************** */
448 static BOOL init_structs(void)
450 extern fstring local_machine;
457 if (! *global_myname)
459 fstrcpy( global_myname, myhostname );
460 p = strchr( global_myname, '.' );
464 strupper( global_myname );
466 /* Add any NETBIOS name aliases. Ensure that the first entry
467 is equal to global_myname.
469 /* Work out the max number of netbios aliases that we have */
470 ptr = lp_netbios_aliases();
471 for( namecount=0; next_token(&ptr,nbname,NULL, sizeof(nbname)); namecount++ )
473 if ( *global_myname )
476 /* Allocate space for the netbios aliases */
477 my_netbios_names = (char **)malloc( sizeof(char *) * (namecount+1) );
478 if( NULL == my_netbios_names )
480 DEBUG( 0, ( "init_structs: malloc fail.\n" ) );
484 /* Use the global_myname string first */
486 if ( *global_myname )
487 my_netbios_names[namecount++] = global_myname;
489 ptr = lp_netbios_aliases();
490 while ( next_token( &ptr, nbname, NULL, sizeof(nbname) ) )
493 /* Look for duplicates */
495 for( n=0; n<namecount; n++ )
497 if( 0 == strcmp( nbname, my_netbios_names[n] ) )
501 my_netbios_names[namecount++] = strdup( nbname );
504 /* Check the strdups succeeded. */
505 for( n = 0; n < namecount; n++ )
506 if( NULL == my_netbios_names[n] )
508 DEBUG(0,("init_structs: malloc fail when allocating names.\n"));
512 /* Terminate name list */
513 my_netbios_names[namecount++] = NULL;
515 fstrcpy( local_machine, global_myname );
516 trim_string( local_machine, " ", " " );
517 p = strchr( local_machine, ' ' );
520 strlower( local_machine );
522 DEBUG( 5, ("Netbios name list:-\n") );
523 for( n=0; my_netbios_names[n]; n++ )
524 DEBUGADD( 5, ( "my_netbios_names[%d]=\"%s\"\n", n, my_netbios_names[n] ) );
529 /**************************************************************************** **
531 **************************************************************************** */
532 static void usage(char *pname)
534 DEBUG(0,("Incorrect program usage - is the command line correct?\n"));
536 printf( "Usage: %s [-n name] [-D] [-p port] [-d debuglevel] ", pname );
537 printf( "[-l log basename]\n" );
538 printf( "Version %s\n", VERSION );
539 printf( "\t-D become a daemon\n" );
540 printf( "\t-p port listen on the specified port\n" );
541 printf( "\t-d debuglevel set the debuglevel\n" );
542 printf( "\t-l log basename. Basename for log/debug files\n" );
543 printf( "\t-n netbiosname. " );
544 printf( "the netbios name to advertise for this host\n");
545 printf( "\t-H hosts file load a netbios hosts file\n" );
546 printf( "\t-a append to log file (default)\n" );
547 printf( "\t-o overwrite log file, don't append\n" );
552 /**************************************************************************** **
554 **************************************************************************** */
555 int main(int argc,char *argv[])
560 extern BOOL append_log;
562 append_log = True; /* Default, override with '-o' option. */
564 global_nmb_port = NMB_PORT;
566 global_in_nmbd = True;
568 StartupTime = time(NULL);
570 srandom(time(NULL) ^ getpid());
574 pstrcpy( debugf, NMBLOGFILE );
576 setup_logging( argv[0], False );
578 charset_initialise();
580 if(!initialize_password_db())
584 pstrcpy( host_file, LMHOSTSFILE );
587 /* this is for people who can't start the program correctly */
588 while (argc > 1 && (*argv[1] != '-'))
594 fault_setup((void (*)(void *))fault_continue );
596 CatchSignal( SIGHUP, SIGNAL_CAST sig_hup );
597 CatchSignal( SIGTERM, SIGNAL_CAST sig_term );
599 /* Setup the signals that allow the debug log level
600 to by dynamically changed. */
602 /* If we are using the malloc debug code we can't use
603 SIGUSR1 and SIGUSR2 to do debug level changes. */
606 CatchSignal( SIGUSR1, SIGNAL_CAST sig_usr1 );
610 CatchSignal( SIGUSR2, SIGNAL_CAST sig_usr2 );
615 (opt = getopt( argc, argv, "aos:T:I:C:bAi:B:N:Rn:l:d:Dp:hSH:G:f:" )) )
620 pstrcpy(servicesf,optarg);
627 DEBUG(0,("Obsolete option '%c' used\n",opt));
630 pstrcpy(host_file,optarg);
633 pstrcpy(global_myname,optarg);
634 strupper(global_myname);
637 slprintf(debugf,sizeof(debugf)-1, "%s.nmb",optarg);
640 pstrcpy(scope,optarg);
653 DEBUGLEVEL = atoi(optarg);
656 global_nmb_port = atoi(optarg);
663 if( !is_a_socket(0) )
674 DEBUG( 1, ( "Netbios nameserver version %s started.\n", VERSION ) );
675 DEBUGADD( 1, ( "Copyright Andrew Tridgell 1994-1997\n" ) );
677 if( !get_myname( myhostname, NULL) )
679 DEBUG( 0, ( "Unable to get my hostname - exiting.\n" ) );
683 if ( !reload_services(False) )
686 codepage_initialise(lp_client_code_page());
691 reload_services( True );
693 fstrcpy( global_myworkgroup, lp_workgroup() );
695 if (strequal(global_myworkgroup,"*"))
697 DEBUG(0,("ERROR: a workgroup name of * is no longer supported\n"));
703 if (!is_daemon && !is_a_socket(0))
705 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
711 DEBUG( 2, ( "Becoming a daemon.\n" ) );
715 if (!directory_exist(lp_lockdir(), NULL)) {
716 mkdir(lp_lockdir(), 0755);
719 pidfile_create("nmbd");
721 DEBUG( 3, ( "Opening sockets %d\n", global_nmb_port ) );
723 if ( !open_sockets( is_daemon, global_nmb_port ) )
726 /* Determine all the IP addresses we have. */
729 /* Create an nmbd subnet record for each of the above. */
730 if( False == create_subnets() )
732 DEBUG(0,("ERROR: Failed when creating subnet lists. Exiting.\n"));
736 /* Load in any static local names. */
739 load_lmhosts_file(host_file);
740 DEBUG(3,("Loaded hosts file\n"));
743 /* If we are acting as a WINS server, initialise data structures. */
744 if( !initialise_wins() )
746 DEBUG( 0, ( "nmbd: Failed when initialising WINS server.\n" ) );
751 * Register nmbd primary workgroup and nmbd names on all
752 * the broadcast subnets, and on the WINS server (if specified).
753 * Also initiate the startup of our primary workgroup (start
754 * elections if we are setup as being able to be a local
758 if( False == register_my_workgroup_and_names() )
760 DEBUG(0,("ERROR: Failed when creating my my workgroup. Exiting.\n"));
764 /* We can only take signals in the select. */
765 BlockSignals( True, SIGTERM );
767 BlockSignals( True, SIGUSR1);
770 BlockSignals( True, SIGUSR2);
781 /* ========================================================================== */