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(-1);
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
))
501 charset_initialise(lp_client_code_page());
505 reload_services(True
);
507 strcpy(myworkgroup
, lp_workgroup());
509 if (strequal(myworkgroup
,"*")) {
510 DEBUG(0,("ERROR: a workgroup name of * is no longer supported\n"));
516 if (!is_daemon
&& !is_a_socket(0)) {
517 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
522 DEBUG(2,("%s becoming a daemon\n",timestring()));
531 if ((fd
= open(pidFile
,
532 O_NONBLOCK
| O_CREAT
| O_WRONLY
| O_TRUNC
, 0644)) < 0)
534 DEBUG(0,("ERROR: can't open %s: %s\n", pidFile
, strerror(errno
)));
537 if (fcntl_lock(fd
,F_SETLK
,0,1,F_WRLCK
)==False
)
539 DEBUG(0,("ERROR: nmbd is already running\n"));
542 sprintf(buf
, "%u\n", (unsigned int) getpid());
543 if (write(fd
, buf
, strlen(buf
)) < 0)
545 DEBUG(0,("ERROR: can't write to %s: %s\n", pidFile
, strerror(errno
)));
548 /* Leave pid file open & locked for the duration... */
552 DEBUG(3,("Opening sockets %d\n", port
));
554 if (!open_sockets(is_daemon
,port
)) return 1;
557 add_my_subnets(myworkgroup
);
561 DEBUG(3,("Checked names\n"));
563 load_netbios_names();
565 DEBUG(3,("Loaded names\n"));
568 load_hosts_file(host_file
);
569 DEBUG(3,("Loaded hosts file\n"));
572 write_browse_list(time(NULL
));
574 DEBUG(3,("Dumped names\n"));
576 /* We can only take sigterm signals in the select. */
577 BlockSignals(True
,SIGTERM
);