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(False);
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);
108 /**************************************************************************** **
109 prepare to dump a core file - carefully!
110 **************************************************************************** */
111 static BOOL dump_core(void)
115 pstrcpy( dname, debugf );
116 if ((p=strrchr(dname,'/')))
118 pstrcat( dname, "/corefiles" );
119 mkdir( dname, 0700 );
120 sys_chown( dname, getuid(), getgid() );
121 chmod( dname, 0700 );
126 #ifdef HAVE_GETRLIMIT
130 getrlimit( RLIMIT_CORE, &rlp );
131 rlp.rlim_cur = MAX( 4*1024*1024, rlp.rlim_cur );
132 setrlimit( RLIMIT_CORE, &rlp );
133 getrlimit( RLIMIT_CORE, &rlp );
134 DEBUG( 3, ( "Core limits now %d %d\n", (int)rlp.rlim_cur, (int)rlp.rlim_max ) );
140 DEBUG(0,("Dumping core in %s\n",dname));
147 /**************************************************************************** **
148 possibly continue after a fault
149 **************************************************************************** */
150 static void fault_continue(void)
155 } /* fault_continue */
157 /**************************************************************************** **
158 expire old names from the namelist and server list
159 **************************************************************************** */
160 static void expire_names_and_servers(time_t t)
162 static time_t lastrun = 0;
166 if ( t < (lastrun + 5) )
171 * Expire any timed out names on all the broadcast
172 * subnets and those registered with the WINS server.
173 * (nmbd_namelistdb.c)
178 * Go through all the broadcast subnets and for each
179 * workgroup known on that subnet remove any expired
180 * server names. If a workgroup has an empty serverlist
181 * and has itself timed out then remove the workgroup.
182 * (nmbd_workgroupdb.c)
184 expire_workgroups_and_servers(t);
185 } /* expire_names_and_servers */
187 /**************************************************************************** **
188 reload the services file
189 **************************************************************************** */
190 BOOL reload_services(BOOL test)
193 extern fstring remote_machine;
195 fstrcpy( remote_machine, "nmb" );
200 pstrcpy( fname,lp_configfile());
201 if (file_exist(fname,NULL) && !strcsequal(fname,servicesf))
203 pstrcpy(servicesf,fname);
208 if ( test && !lp_file_list_changed() )
211 ret = lp_load( servicesf, True , False, False);
213 /* perhaps the config filename is now set */
216 DEBUG( 3, ( "services not loaded\n" ) );
217 reload_services( True );
220 /* Do a sanity check for a misconfigured nmbd */
221 if( lp_wins_support() && *lp_wins_server() )
223 DEBUG(0,("ERROR: both 'wins support = true' and 'wins server = <server>' \
224 cannot be set in the smb.conf file. nmbd aborting.\n"));
229 } /* reload_services */
231 /**************************************************************************** **
232 The main select loop.
233 **************************************************************************** */
234 static void process(void)
240 time_t t = time(NULL);
243 * Check all broadcast subnets to see if
244 * we need to run an election on any of them.
247 run_election = check_elections();
250 * Read incoming UDP packets.
253 if(listen_for_packets(run_election))
257 * Process all incoming packets
258 * read above. This calls the success and
259 * failure functions registered when response
260 * packets arrrive, and also deals with request
261 * packets from other sources.
267 * Run any elections - initiate becoming
268 * a local master browser if we have won.
274 * Send out any broadcast announcements
275 * of our server names. This also announces
276 * the workgroup name if we are a local
278 * (nmbd_sendannounce.c)
280 announce_my_server_names(t);
283 * Send out any LanMan broadcast announcements
284 * of our server names.
285 * (nmbd_sendannounce.c)
287 announce_my_lm_server_names(t);
290 * If we are a local master browser, periodically
291 * announce ourselves to the domain master browser.
292 * This also deals with syncronising the domain master
293 * browser server lists with ourselves as a local
295 * (nmbd_sendannounce.c)
297 announce_myself_to_domain_master_browser(t);
300 * Fullfill any remote announce requests.
301 * (nmbd_sendannounce.c)
306 * Fullfill any remote browse sync announce requests.
307 * (nmbd_sendannounce.c)
309 browse_sync_remote(t);
312 * Scan the broadcast subnets, and WINS client
313 * namelists and refresh any that need refreshing.
319 * Scan the subnet namelists and server lists and
320 * expire thos that have timed out.
323 expire_names_and_servers(t);
326 * Write out a snapshot of our current browse list into
327 * the browse.dat file. This is used by smbd to service
328 * incoming NetServerEnum calls - used to synchronise
329 * browse lists over subnets.
330 * (nmbd_serverlistdb.c)
332 write_browse_list(t, False);
335 * If we are a domain master browser, we have a list of
336 * local master browsers we should synchronise browse
337 * lists with (these are added by an incoming local
338 * master browser announcement packet). Expire any of
339 * these that are no longer current, and pull the server
340 * lists from each of these known local master browsers.
341 * (nmbd_browsesync.c)
343 dmb_expire_and_sync_browser_lists(t);
346 * Check that there is a local master browser for our
347 * workgroup for all our broadcast subnets. If one
348 * is not found, start an election (which we ourselves
349 * may or may not participate in, depending on the
350 * setting of the 'local master' parameter.
353 check_master_browser_exists(t);
356 * If we are configured as a logon server, attempt to
357 * register the special NetBIOS names to become such
358 * (WORKGROUP<1c> name) on all broadcast subnets and
359 * with the WINS server (if used). If we are configured
360 * to become a domain master browser, attempt to register
361 * the special NetBIOS name (WORKGROUP<1b> name) to
363 * (nmbd_become_dmb.c)
368 * If we are a WINS server, do any timer dependent
369 * processing required.
370 * (nmbd_winsserver.c)
372 initiate_wins_processing(t);
375 * If we are a domain master browser, attempt to contact the
376 * WINS server to get a list of all known WORKGROUPS/DOMAINS.
377 * This will only work to a Samba WINS server.
378 * (nmbd_browsesync.c)
380 collect_all_workgroup_names_from_wins_server(t);
383 * Go through the response record queue and time out or re-transmit
384 * and expired entries.
387 retransmit_or_expire_response_records(t);
390 * check to see if any remote browse sync child processes have completed
392 sync_check_completion();
395 * regularly sync with any other DMBs we know about
402 /**************************************************************************** **
403 open the socket communication
404 **************************************************************************** */
405 static BOOL open_sockets(BOOL isdaemon, int port)
407 /* The sockets opened here will be used to receive broadcast
408 packets *only*. Interface specific sockets are opened in
409 make_subnet() in namedbsubnet.c. Thus we bind to the
410 address "0.0.0.0". The parameter 'socket address' is
415 ClientNMB = open_socket_in(SOCK_DGRAM, port,0,0);
419 ClientDGRAM = open_socket_in(SOCK_DGRAM,DGRAM_PORT,3,0);
421 if ( ClientNMB == -1 )
424 /* we are never interested in SIGPIPE */
425 BlockSignals(True,SIGPIPE);
427 set_socket_options( ClientNMB, "SO_BROADCAST" );
428 set_socket_options( ClientDGRAM, "SO_BROADCAST" );
430 DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
435 /**************************************************************************** **
436 initialise connect, service and file structs
437 **************************************************************************** */
438 static BOOL init_structs(void)
440 extern fstring local_machine;
447 if (! *global_myname)
449 fstrcpy( global_myname, myhostname );
450 p = strchr( global_myname, '.' );
454 strupper( global_myname );
456 /* Add any NETBIOS name aliases. Ensure that the first entry
457 is equal to global_myname.
459 /* Work out the max number of netbios aliases that we have */
460 ptr = lp_netbios_aliases();
461 for( namecount=0; next_token(&ptr,nbname,NULL, sizeof(nbname)); namecount++ )
463 if ( *global_myname )
466 /* Allocate space for the netbios aliases */
467 my_netbios_names = (char **)malloc( sizeof(char *) * (namecount+1) );
468 if( NULL == my_netbios_names )
470 DEBUG( 0, ( "init_structs: malloc fail.\n" ) );
474 /* Use the global_myname string first */
476 if ( *global_myname )
477 my_netbios_names[namecount++] = global_myname;
479 ptr = lp_netbios_aliases();
480 while ( next_token( &ptr, nbname, NULL, sizeof(nbname) ) )
483 /* Look for duplicates */
485 for( n=0; n<namecount; n++ )
487 if( 0 == strcmp( nbname, my_netbios_names[n] ) )
491 my_netbios_names[namecount++] = strdup( nbname );
494 /* Check the strdups succeeded. */
495 for( n = 0; n < namecount; n++ )
496 if( NULL == my_netbios_names[n] )
498 DEBUG(0,("init_structs: malloc fail when allocating names.\n"));
502 /* Terminate name list */
503 my_netbios_names[namecount++] = NULL;
505 fstrcpy( local_machine, global_myname );
506 trim_string( local_machine, " ", " " );
507 p = strchr( local_machine, ' ' );
510 strlower( local_machine );
512 DEBUG( 5, ("NetBIOS name list:-\n") );
513 for( n=0; my_netbios_names[n]; n++ )
514 DEBUGADD( 5, ( "my_netbios_names[%d]=\"%s\"\n", n, my_netbios_names[n] ) );
519 /**************************************************************************** **
521 **************************************************************************** */
522 static void usage(char *pname)
524 DEBUG(0,("Incorrect program usage - is the command line correct?\n"));
526 printf( "Usage: %s [-n name] [-D] [-p port] [-d debuglevel] ", pname );
527 printf( "[-l log basename]\n" );
528 printf( "Version %s\n", VERSION );
529 printf( "\t-D become a daemon\n" );
530 printf( "\t-p port listen on the specified port\n" );
531 printf( "\t-d debuglevel set the debuglevel\n" );
532 printf( "\t-l log basename. Basename for log/debug files\n" );
533 printf( "\t-n netbiosname. " );
534 printf( "the netbios name to advertise for this host\n");
535 printf( "\t-H hosts file load a netbios hosts file\n" );
536 printf( "\t-a append to log file (default)\n" );
537 printf( "\t-o overwrite log file, don't append\n" );
542 /**************************************************************************** **
544 **************************************************************************** */
545 int main(int argc,char *argv[])
550 extern BOOL append_log;
552 append_log = True; /* Default, override with '-o' option. */
554 global_nmb_port = NMB_PORT;
556 global_in_nmbd = True;
558 StartupTime = time(NULL);
560 sys_srandom(time(NULL) ^ getpid());
564 pstrcpy( debugf, NMBLOGFILE );
566 setup_logging( argv[0], False );
568 charset_initialise();
571 pstrcpy( host_file, LMHOSTSFILE );
574 /* this is for people who can't start the program correctly */
575 while (argc > 1 && (*argv[1] != '-'))
581 fault_setup((void (*)(void *))fault_continue );
583 CatchSignal( SIGHUP, SIGNAL_CAST sig_hup );
584 CatchSignal( SIGTERM, SIGNAL_CAST sig_term );
586 /* Setup the signals that allow the debug log level
587 to by dynamically changed. */
589 /* If we are using the malloc debug code we can't use
590 SIGUSR1 and SIGUSR2 to do debug level changes. */
593 CatchSignal( SIGUSR1, SIGNAL_CAST sig_usr1 );
597 CatchSignal( SIGUSR2, SIGNAL_CAST sig_usr2 );
602 (opt = getopt( argc, argv, "aos:T:I:C:bAi:B:N:Rn:l:d:Dp:hSH:G:f:" )) )
607 pstrcpy(servicesf,optarg);
614 DEBUG(0,("Obsolete option '%c' used\n",opt));
617 pstrcpy(host_file,optarg);
620 pstrcpy(global_myname,optarg);
621 strupper(global_myname);
624 slprintf(debugf,sizeof(debugf)-1, "%s.nmb",optarg);
627 pstrcpy(scope,optarg);
640 DEBUGLEVEL = atoi(optarg);
643 global_nmb_port = atoi(optarg);
650 if( !is_a_socket(0) )
661 DEBUG( 1, ( "NetBIOS nameserver version %s started.\n", VERSION ) );
662 DEBUGADD( 1, ( "Copyright Andrew Tridgell 1994-1998\n" ) );
664 if( !get_myname( myhostname, NULL) )
666 DEBUG( 0, ( "Unable to get my hostname - exiting.\n" ) );
670 if ( !reload_services(False) )
673 codepage_initialise(lp_client_code_page());
678 reload_services( True );
680 if (!pwdb_initialise(False))
685 if (!get_member_domain_sid())
687 DEBUG(0,("ERROR: Samba cannot obtain PDC SID from PDC(s) %s.\n",
688 lp_passwordserver()));
694 if (!is_daemon && !is_a_socket(0))
696 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
702 DEBUG( 2, ( "Becoming a daemon.\n" ) );
706 if (!directory_exist(lp_lockdir(), NULL)) {
707 mkdir(lp_lockdir(), 0755);
710 pidfile_create("nmbd");
712 DEBUG( 3, ( "Opening sockets %d\n", global_nmb_port ) );
714 if ( !open_sockets( is_daemon, global_nmb_port ) )
717 /* Determine all the IP addresses we have. */
720 /* Create an nmbd subnet record for each of the above. */
721 if( False == create_subnets() )
723 DEBUG(0,("ERROR: Failed when creating subnet lists. Exiting.\n"));
727 /* Load in any static local names. */
730 load_lmhosts_file(host_file);
731 DEBUG(3,("Loaded hosts file\n"));
734 /* If we are acting as a WINS server, initialise data structures. */
735 if( !initialise_wins() )
737 DEBUG( 0, ( "nmbd: Failed when initialising WINS server.\n" ) );
742 * Register nmbd primary workgroup and nmbd names on all
743 * the broadcast subnets, and on the WINS server (if specified).
744 * Also initiate the startup of our primary workgroup (start
745 * elections if we are setup as being able to be a local
749 if( False == register_my_workgroup_and_names() )
751 DEBUG(0,("ERROR: Failed when creating my my workgroup. Exiting.\n"));
755 /* We can only take signals in the select. */
756 BlockSignals( True, SIGTERM );
758 BlockSignals( True, SIGUSR1);
761 BlockSignals( True, SIGUSR2);