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") );
116 BlockSignals( False, SIGPIPE );
120 /**************************************************************************** **
121 prepare to dump a core file - carefully!
122 **************************************************************************** */
123 static BOOL dump_core(void)
127 pstrcpy( dname, debugf );
128 if ((p=strrchr(dname,'/')))
130 pstrcat( dname, "/corefiles" );
131 mkdir( dname, 0700 );
132 sys_chown( dname, getuid(), getgid() );
133 chmod( dname, 0700 );
138 #ifdef HAVE_GETRLIMIT
142 getrlimit( RLIMIT_CORE, &rlp );
143 rlp.rlim_cur = MAX( 4*1024*1024, rlp.rlim_cur );
144 setrlimit( RLIMIT_CORE, &rlp );
145 getrlimit( RLIMIT_CORE, &rlp );
146 DEBUG( 3, ( "Core limits now %d %d\n", (int)rlp.rlim_cur, (int)rlp.rlim_max ) );
152 DEBUG(0,("Dumping core in %s\n",dname));
159 /**************************************************************************** **
160 possibly continue after a fault
161 **************************************************************************** */
162 static void fault_continue(void)
167 } /* fault_continue */
169 /**************************************************************************** **
170 expire old names from the namelist and server list
171 **************************************************************************** */
172 static void expire_names_and_servers(time_t t)
174 static time_t lastrun = 0;
178 if ( t < (lastrun + 5) )
183 * Expire any timed out names on all the broadcast
184 * subnets and those registered with the WINS server.
185 * (nmbd_namelistdb.c)
190 * Go through all the broadcast subnets and for each
191 * workgroup known on that subnet remove any expired
192 * server names. If a workgroup has an empty serverlist
193 * and has itself timed out then remove the workgroup.
194 * (nmbd_workgroupdb.c)
196 expire_workgroups_and_servers(t);
197 } /* expire_names_and_servers */
199 /**************************************************************************** **
200 reload the services file
201 **************************************************************************** */
202 BOOL reload_services(BOOL test)
205 extern fstring remote_machine;
207 fstrcpy( remote_machine, "nmb" );
212 pstrcpy( fname,lp_configfile());
213 if (file_exist(fname,NULL) && !strcsequal(fname,servicesf))
215 pstrcpy(servicesf,fname);
220 if ( test && !lp_file_list_changed() )
223 ret = lp_load( servicesf, True , False, False);
225 /* perhaps the config filename is now set */
228 DEBUG( 3, ( "services not loaded\n" ) );
229 reload_services( True );
232 /* Do a sanity check for a misconfigured nmbd */
233 if( lp_wins_support() && *lp_wins_server() )
235 DEBUG(0,("ERROR: both 'wins support = true' and 'wins server = <server>' \
236 cannot be set in the smb.conf file. nmbd aborting.\n"));
241 } /* reload_services */
243 /**************************************************************************** **
244 The main select loop.
245 **************************************************************************** */
246 static void process(void)
252 time_t t = time(NULL);
255 * Check all broadcast subnets to see if
256 * we need to run an election on any of them.
259 run_election = check_elections();
262 * Read incoming UDP packets.
265 if(listen_for_packets(run_election))
269 * Process all incoming packets
270 * read above. This calls the success and
271 * failure functions registered when response
272 * packets arrrive, and also deals with request
273 * packets from other sources.
279 * Run any elections - initiate becoming
280 * a local master browser if we have won.
286 * Send out any broadcast announcements
287 * of our server names. This also announces
288 * the workgroup name if we are a local
290 * (nmbd_sendannounce.c)
292 announce_my_server_names(t);
295 * Send out any LanMan broadcast announcements
296 * of our server names.
297 * (nmbd_sendannounce.c)
299 announce_my_lm_server_names(t);
302 * If we are a local master browser, periodically
303 * announce ourselves to the domain master browser.
304 * This also deals with syncronising the domain master
305 * browser server lists with ourselves as a local
307 * (nmbd_sendannounce.c)
309 announce_myself_to_domain_master_browser(t);
312 * Fullfill any remote announce requests.
313 * (nmbd_sendannounce.c)
318 * Fullfill any remote browse sync announce requests.
319 * (nmbd_sendannounce.c)
321 browse_sync_remote(t);
324 * Scan the broadcast subnets, and WINS client
325 * namelists and refresh any that need refreshing.
331 * Scan the subnet namelists and server lists and
332 * expire thos that have timed out.
335 expire_names_and_servers(t);
338 * Write out a snapshot of our current browse list into
339 * the browse.dat file. This is used by smbd to service
340 * incoming NetServerEnum calls - used to synchronise
341 * browse lists over subnets.
342 * (nmbd_serverlistdb.c)
344 write_browse_list(t, False);
347 * If we are a domain master browser, we have a list of
348 * local master browsers we should synchronise browse
349 * lists with (these are added by an incoming local
350 * master browser announcement packet). Expire any of
351 * these that are no longer current, and pull the server
352 * lists from each of these known local master browsers.
353 * (nmbd_browsesync.c)
355 dmb_expire_and_sync_browser_lists(t);
358 * Check that there is a local master browser for our
359 * workgroup for all our broadcast subnets. If one
360 * is not found, start an election (which we ourselves
361 * may or may not participate in, depending on the
362 * setting of the 'local master' parameter.
365 check_master_browser_exists(t);
368 * If we are configured as a logon server, attempt to
369 * register the special NetBIOS names to become such
370 * (WORKGROUP<1c> name) on all broadcast subnets and
371 * with the WINS server (if used). If we are configured
372 * to become a domain master browser, attempt to register
373 * the special NetBIOS name (WORKGROUP<1b> name) to
375 * (nmbd_become_dmb.c)
380 * If we are a WINS server, do any timer dependent
381 * processing required.
382 * (nmbd_winsserver.c)
384 initiate_wins_processing(t);
387 * If we are a domain master browser, attempt to contact the
388 * WINS server to get a list of all known WORKGROUPS/DOMAINS.
389 * This will only work to a Samba WINS server.
390 * (nmbd_browsesync.c)
392 collect_all_workgroup_names_from_wins_server(t);
395 * Go through the response record queue and time out or re-transmit
396 * and expired entries.
399 retransmit_or_expire_response_records(t);
404 /**************************************************************************** **
405 open the socket communication
406 **************************************************************************** */
407 static BOOL open_sockets(BOOL isdaemon, int port)
409 /* The sockets opened here will be used to receive broadcast
410 packets *only*. Interface specific sockets are opened in
411 make_subnet() in namedbsubnet.c. Thus we bind to the
412 address "0.0.0.0". The parameter 'socket address' is
417 ClientNMB = open_socket_in(SOCK_DGRAM, port,0,0);
421 ClientDGRAM = open_socket_in(SOCK_DGRAM,DGRAM_PORT,3,0);
423 if ( ClientNMB == -1 )
426 CatchSignal( SIGPIPE, SIGNAL_CAST sig_pipe );
428 set_socket_options( ClientNMB, "SO_BROADCAST" );
429 set_socket_options( ClientDGRAM, "SO_BROADCAST" );
431 DEBUG( 3, ( "open_sockets: Broadcast sockets opened.\n" ) );
436 /**************************************************************************** **
437 initialise connect, service and file structs
438 **************************************************************************** */
439 static BOOL init_structs(void)
441 extern fstring local_machine;
448 if (! *global_myname)
450 fstrcpy( global_myname, myhostname );
451 p = strchr( global_myname, '.' );
455 strupper( global_myname );
457 /* Add any NETBIOS name aliases. Ensure that the first entry
458 is equal to global_myname.
460 /* Work out the max number of netbios aliases that we have */
461 ptr = lp_netbios_aliases();
462 for( namecount=0; next_token(&ptr,nbname,NULL); namecount++ )
464 if ( *global_myname )
467 /* Allocate space for the netbios aliases */
468 my_netbios_names = (char **)malloc( sizeof(char *) * (namecount+1) );
469 if( NULL == my_netbios_names )
471 DEBUG( 0, ( "init_structs: malloc fail.\n" ) );
475 /* Use the global_myname string first */
477 if ( *global_myname )
478 my_netbios_names[namecount++] = global_myname;
480 ptr = lp_netbios_aliases();
481 while ( next_token( &ptr, nbname, NULL ) )
484 /* Look for duplicates */
486 for( n=0; n<namecount; n++ )
488 if( 0 == strcmp( nbname, my_netbios_names[n] ) )
492 my_netbios_names[namecount++] = strdup( nbname );
495 /* Check the strdups succeeded. */
496 for( n = 0; n < namecount; n++ )
497 if( NULL == my_netbios_names[n] )
499 DEBUG(0,("init_structs: malloc fail when allocating names.\n"));
503 /* Terminate name list */
504 my_netbios_names[namecount++] = NULL;
506 fstrcpy( local_machine, global_myname );
507 trim_string( local_machine, " ", " " );
508 p = strchr( local_machine, ' ' );
511 strlower( local_machine );
513 DEBUG( 5, ("Netbios name list:-\n") );
514 for( n=0; my_netbios_names[n]; n++ )
515 DEBUGADD( 5, ( "my_netbios_names[%d]=\"%s\"\n", n, my_netbios_names[n] ) );
520 /**************************************************************************** **
522 **************************************************************************** */
523 static void usage(char *pname)
525 DEBUG(0,("Incorrect program usage - is the command line correct?\n"));
527 printf( "Usage: %s [-n name] [-D] [-p port] [-d debuglevel] ", pname );
528 printf( "[-l log basename]\n" );
529 printf( "Version %s\n", VERSION );
530 printf( "\t-D become a daemon\n" );
531 printf( "\t-p port listen on the specified port\n" );
532 printf( "\t-d debuglevel set the debuglevel\n" );
533 printf( "\t-l log basename. Basename for log/debug files\n" );
534 printf( "\t-n netbiosname. " );
535 printf( "the netbios name to advertise for this host\n");
536 printf( "\t-H hosts file load a netbios hosts file\n" );
537 printf( "\t-a append to log file (default)\n" );
538 printf( "\t-o overwrite log file, don't append\n" );
543 /**************************************************************************** **
545 **************************************************************************** */
546 int main(int argc,char *argv[])
551 extern BOOL append_log;
553 append_log = True; /* Default, override with '-o' option. */
555 global_nmb_port = NMB_PORT;
557 global_in_nmbd = True;
559 StartupTime = time(NULL);
563 pstrcpy( debugf, NMBLOGFILE );
565 setup_logging( argv[0], False );
567 charset_initialise();
569 if(!initialize_password_db())
573 pstrcpy( host_file, LMHOSTSFILE );
576 /* this is for people who can't start the program correctly */
577 while (argc > 1 && (*argv[1] != '-'))
583 fault_setup((void (*)(void *))fault_continue );
585 CatchSignal( SIGHUP, SIGNAL_CAST sig_hup );
586 CatchSignal( SIGTERM, SIGNAL_CAST sig_term );
588 /* Setup the signals that allow the debug log level
589 to by dynamically changed. */
591 /* If we are using the malloc debug code we can't use
592 SIGUSR1 and SIGUSR2 to do debug level changes. */
595 CatchSignal( SIGUSR1, SIGNAL_CAST sig_usr1 );
599 CatchSignal( SIGUSR2, SIGNAL_CAST sig_usr2 );
604 (opt = getopt( argc, argv, "aos:T:I:C:bAi:B:N:Rn:l:d:Dp:hSH:G:f:" )) )
609 pstrcpy(servicesf,optarg);
616 DEBUG(0,("Obsolete option '%c' used\n",opt));
619 pstrcpy(host_file,optarg);
622 pstrcpy(global_myname,optarg);
623 strupper(global_myname);
626 slprintf(debugf,sizeof(debugf)-1, "%s.nmb",optarg);
629 pstrcpy(scope,optarg);
642 DEBUGLEVEL = atoi(optarg);
645 global_nmb_port = atoi(optarg);
652 if( !is_a_socket(0) )
663 DEBUG( 1, ( "Netbios nameserver version %s started.\n", VERSION ) );
664 DEBUGADD( 1, ( "Copyright Andrew Tridgell 1994-1997\n" ) );
666 if( !get_myname( myhostname, NULL) )
668 DEBUG( 0, ( "Unable to get my hostname - exiting.\n" ) );
672 if ( !reload_services(False) )
675 codepage_initialise(lp_client_code_page());
680 reload_services( True );
682 fstrcpy( global_myworkgroup, lp_workgroup() );
684 if (strequal(global_myworkgroup,"*"))
686 DEBUG(0,("ERROR: a workgroup name of * is no longer supported\n"));
692 if (!is_daemon && !is_a_socket(0))
694 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
700 DEBUG( 2, ( "Becoming a daemon.\n" ) );
704 if (!directory_exist(lp_lockdir(), NULL)) {
705 mkdir(lp_lockdir(), 0755);
708 pidfile_create("nmbd");
710 DEBUG( 3, ( "Opening sockets %d\n", global_nmb_port ) );
712 if ( !open_sockets( is_daemon, global_nmb_port ) )
715 /* Determine all the IP addresses we have. */
718 /* Create an nmbd subnet record for each of the above. */
719 if( False == create_subnets() )
721 DEBUG(0,("ERROR: Failed when creating subnet lists. Exiting.\n"));
725 /* Load in any static local names. */
728 load_lmhosts_file(host_file);
729 DEBUG(3,("Loaded hosts file\n"));
732 /* If we are acting as a WINS server, initialise data structures. */
733 if( !initialise_wins() )
735 DEBUG( 0, ( "nmbd: Failed when initialising WINS server.\n" ) );
740 * Register nmbd primary workgroup and nmbd names on all
741 * the broadcast subnets, and on the WINS server (if specified).
742 * Also initiate the startup of our primary workgroup (start
743 * elections if we are setup as being able to be a local
747 if( False == register_my_workgroup_and_names() )
749 DEBUG(0,("ERROR: Failed when creating my my workgroup. Exiting.\n"));
753 /* We can only take signals in the select. */
754 BlockSignals( True, SIGTERM );
756 BlockSignals( True, SIGUSR1);
759 BlockSignals( True, SIGUSR2);
770 /* ========================================================================== */