2 Unix SMB/CIFS implementation.
3 Main SMB server routines
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Martin Pool 2002
6 Copyright (C) Jelmer Vernooij 2002-2003
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 static int am_parent = 1;
27 /* the last message the was processed */
28 int last_message = -1;
30 /* a useful macro to debug the last message processed */
31 #define LAST_MESSAGE() smb_fn_name(last_message)
33 extern pstring user_socket_options;
34 extern SIG_ATOMIC_T got_sig_term;
35 extern SIG_ATOMIC_T reload_after_sighup;
38 extern int dcelogin_atmost_once;
41 /* really we should have a top level context structure that has the
42 client file descriptor as an element. That would require a major rewrite :(
44 the following 2 functions are an alternative - they make the file
45 descriptor private to smbd
47 static int server_fd = -1;
49 int smbd_server_fd(void)
54 static void smbd_set_server_fd(int fd)
60 /****************************************************************************
62 ****************************************************************************/
64 static void sig_term(void)
70 /****************************************************************************
72 ****************************************************************************/
74 static void sig_hup(int sig)
76 reload_after_sighup = 1;
80 /****************************************************************************
81 Send a SIGTERM to our process group.
82 *****************************************************************************/
84 static void killkids(void)
86 if(am_parent) kill(0,SIGTERM);
89 /****************************************************************************
90 Process a sam sync message - not sure whether to do this here or
92 ****************************************************************************/
94 static void msg_sam_sync(int UNUSED(msg_type), pid_t UNUSED(pid),
95 void *UNUSED(buf), size_t UNUSED(len))
97 DEBUG(10, ("** sam sync message received, ignoring\n"));
100 /****************************************************************************
101 Process a sam sync replicate message - not sure whether to do this here or
103 ****************************************************************************/
105 static void msg_sam_repl(int msg_type, pid_t pid, void *buf, size_t len)
109 if (len != sizeof(uint32))
112 low_serial = *((uint32 *)buf);
114 DEBUG(3, ("received sam replication message, serial = 0x%04x\n",
118 /****************************************************************************
119 Open the socket communication - inetd.
120 ****************************************************************************/
122 static BOOL open_sockets_inetd(void)
124 /* Started from inetd. fd 0 is the socket. */
125 /* We will abort gracefully when the client or remote system
127 smbd_set_server_fd(dup(0));
129 /* close our standard file descriptors */
130 close_low_fds(False); /* Don't close stderr */
132 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
133 set_socket_options(smbd_server_fd(), user_socket_options);
138 static void msg_exit_server(int msg_type, pid_t src, void *buf, size_t len)
140 exit_server("Got a SHUTDOWN message");
144 /****************************************************************************
145 Have we reached the process limit ?
146 ****************************************************************************/
148 static BOOL allowable_number_of_smbd_processes(void)
150 int max_processes = lp_max_smbd_processes();
156 TDB_CONTEXT *tdb = conn_tdb_ctx();
159 DEBUG(0,("allowable_number_of_smbd_processes: can't open connection tdb.\n" ));
163 val = tdb_fetch_int32(tdb, "INFO/total_smbds");
164 if (val == -1 && (tdb_error(tdb) != TDB_ERR_NOEXIST)) {
165 DEBUG(0,("allowable_number_of_smbd_processes: can't fetch INFO/total_smbds. Error %s\n",
166 tdb_errorstr(tdb) ));
169 if (val > max_processes) {
170 DEBUG(0,("allowable_number_of_smbd_processes: number of processes (%d) is over allowed limit (%d)\n",
171 val, max_processes ));
178 /****************************************************************************
179 Open the socket communication.
180 ****************************************************************************/
182 static BOOL open_sockets_smbd(BOOL is_daemon, BOOL interactive, const char *smb_ports)
184 int num_interfaces = iface_count();
186 int fd_listenset[FD_SETSIZE];
193 return open_sockets_inetd();
199 static int atexit_set;
200 if(atexit_set == 0) {
210 FD_ZERO(&listen_set);
212 /* use a reasonable default set of ports - listing on 445 and 139 */
214 ports = lp_smb_ports();
215 if (!ports || !*ports) {
216 ports = smb_xstrdup(SMB_PORTS);
218 ports = smb_xstrdup(ports);
221 ports = smb_xstrdup(smb_ports);
224 if (lp_interfaces() && lp_bind_interfaces_only()) {
225 /* We have been given an interfaces line, and been
226 told to only bind to those interfaces. Create a
227 socket per interface and bind to only these.
230 /* Now open a listen socket for each of the
232 for(i = 0; i < num_interfaces; i++) {
233 struct in_addr *ifip = iface_n_ip(i);
238 DEBUG(0,("open_sockets_smbd: interface %d has NULL IP address !\n", i));
242 for (ptr=ports; next_token(&ptr, tok, NULL, sizeof(tok)); ) {
243 unsigned port = atoi(tok);
244 if (port == 0) continue;
245 s = fd_listenset[num_sockets] = open_socket_in(SOCK_STREAM, port, 0, ifip->s_addr, True);
249 /* ready to listen */
250 set_socket_options(s,"SO_KEEPALIVE");
251 set_socket_options(s,user_socket_options);
253 /* Set server socket to non-blocking for the accept. */
254 set_blocking(s,False);
256 if (listen(s, SMBD_LISTEN_BACKLOG) == -1) {
257 DEBUG(0,("listen: %s\n",strerror(errno)));
261 FD_SET(s,&listen_set);
264 if (num_sockets >= FD_SETSIZE) {
265 DEBUG(0,("open_sockets_smbd: Too many sockets to bind to\n"));
271 /* Just bind to 0.0.0.0 - accept connections
279 for (ptr=ports; next_token(&ptr, tok, NULL, sizeof(tok)); ) {
280 unsigned port = atoi(tok);
281 if (port == 0) continue;
282 /* open an incoming socket */
283 s = open_socket_in(SOCK_STREAM, port, 0,
284 interpret_addr(lp_socket_address()),True);
288 /* ready to listen */
289 set_socket_options(s,"SO_KEEPALIVE");
290 set_socket_options(s,user_socket_options);
292 /* Set server socket to non-blocking for the accept. */
293 set_blocking(s,False);
295 if (listen(s, SMBD_LISTEN_BACKLOG) == -1) {
296 DEBUG(0,("open_sockets_smbd: listen: %s\n",
302 fd_listenset[num_sockets] = s;
303 FD_SET(s,&listen_set);
307 if (num_sockets >= FD_SETSIZE) {
308 DEBUG(0,("open_sockets_smbd: Too many sockets to bind to\n"));
316 /* Listen to messages */
318 message_register(MSG_SMB_SAM_SYNC, msg_sam_sync);
319 message_register(MSG_SMB_SAM_REPL, msg_sam_repl);
320 message_register(MSG_SHUTDOWN, msg_exit_server);
322 /* now accept incoming connections - forking a new process
323 for each incoming connection */
324 DEBUG(2,("waiting for a connection\n"));
329 /* Free up temporary memory from the main smbd. */
332 /* Ensure we respond to PING and DEBUG messages from the main smbd. */
335 memcpy((char *)&lfds, (char *)&listen_set,
338 num = sys_select(FD_SETSIZE,&lfds,NULL,NULL,NULL);
340 if (num == -1 && errno == EINTR) {
342 exit_server("Caught TERM signal");
345 /* check for sighup processing */
346 if (reload_after_sighup) {
347 change_to_root_user();
348 DEBUG(1,("Reloading services after SIGHUP\n"));
349 reload_services(False);
350 reload_after_sighup = 0;
356 /* check if we need to reload services */
357 check_reload(time(NULL));
359 /* Find the sockets that are read-ready -
361 for( ; num > 0; num--) {
362 struct sockaddr addr;
363 socklen_t in_addrlen = sizeof(addr);
366 for(i = 0; i < num_sockets; i++) {
367 if(FD_ISSET(fd_listenset[i],&lfds)) {
369 /* Clear this so we don't look
371 FD_CLR(fd_listenset[i],&lfds);
376 smbd_set_server_fd(accept(s,&addr,&in_addrlen));
378 if (smbd_server_fd() == -1 && errno == EINTR)
381 if (smbd_server_fd() == -1) {
382 DEBUG(0,("open_sockets_smbd: accept: %s\n",
387 /* Ensure child is set to blocking mode */
388 set_blocking(smbd_server_fd(),True);
390 if (smbd_server_fd() != -1 && interactive)
393 if (allowable_number_of_smbd_processes() && smbd_server_fd() != -1 && sys_fork()==0) {
396 /* close the listening socket(s) */
397 for(i = 0; i < num_sockets; i++)
398 close(fd_listenset[i]);
400 /* close our standard file
402 close_low_fds(False);
405 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
406 set_socket_options(smbd_server_fd(),user_socket_options);
408 /* this is needed so that we get decent entries
409 in smbstatus for port 445 connects */
410 set_remote_machine_name(get_peer_addr(smbd_server_fd()), False);
412 /* Reset global variables in util.c so
413 that client substitutions will be
414 done correctly in the process. */
415 reset_globals_after_fork();
417 /* tdb needs special fork handling - remove CLEAR_IF_FIRST flags */
418 if (tdb_reopen_all() == -1) {
419 DEBUG(0,("tdb_reopen_all failed.\n"));
420 smb_panic("tdb_reopen_all failed.");
425 /* The parent doesn't need this socket */
426 close(smbd_server_fd());
428 /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
429 Clear the closed fd info out of server_fd --
430 and more importantly, out of client_fd in
431 util_sock.c, to avoid a possible
432 getpeername failure if we reopen the logs
433 and use %I in the filename.
436 smbd_set_server_fd(-1);
438 /* Force parent to check log size after
439 * spawning child. Fix from
440 * klausr@ITAP.Physik.Uni-Stuttgart.De. The
441 * parent smbd will log to logserver.smb. It
442 * writes only two messages for each child
443 * started/finished. But each child writes,
444 * say, 50 messages also in logserver.smb,
445 * begining with the debug_count of the
446 * parent, before the child opens its own log
447 * file logserver.client. In a worst case
448 * scenario the size of logserver.smb would be
449 * checked after about 50*50=2500 messages
452 force_check_log_size();
457 /* NOTREACHED return True; */
460 /****************************************************************************
461 Reload the services file.
462 **************************************************************************/
464 BOOL reload_services(BOOL test)
470 pstrcpy(fname,lp_configfile());
471 if (file_exist(fname, NULL) &&
472 !strcsequal(fname, dyn_CONFIGFILE)) {
473 pstrcpy(dyn_CONFIGFILE, fname);
480 if (test && !lp_file_list_changed())
483 lp_killunused(conn_snum_used);
485 ret = lp_load(dyn_CONFIGFILE, False, False, True);
489 /* perhaps the config filename is now set */
491 reload_services(True);
498 if (smbd_server_fd() != -1) {
499 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
500 set_socket_options(smbd_server_fd(), user_socket_options);
504 mangle_reset_cache();
507 /* this forces service parameters to be flushed */
508 set_current_service(NULL,True);
515 /*******************************************************************
516 prepare to dump a core file - carefully!
517 ********************************************************************/
518 static BOOL dump_core(void)
523 pstrcpy(dname,lp_logfile());
524 if ((p=strrchr_m(dname,'/'))) *p=0;
525 pstrcat(dname,"/corefiles");
527 sys_chown(dname,getuid(),getgid());
529 if (chdir(dname)) return(False);
532 #ifdef HAVE_GETRLIMIT
536 getrlimit(RLIMIT_CORE, &rlp);
537 rlp.rlim_cur = MAX(4*1024*1024,rlp.rlim_cur);
538 setrlimit(RLIMIT_CORE, &rlp);
539 getrlimit(RLIMIT_CORE, &rlp);
540 DEBUG(3,("Core limits now %d %d\n",
541 (int)rlp.rlim_cur,(int)rlp.rlim_max));
547 DEBUG(0,("Dumping core in %s\n", dname));
548 /* Ensure we don't have a signal handler for abort. */
550 CatchSignal(SIGABRT,SIGNAL_CAST SIG_DFL);
557 /****************************************************************************
559 ****************************************************************************/
561 void exit_server(const char *reason)
563 static int firsttime=1;
564 extern char *last_inbuf;
565 extern struct auth_context *negprot_global_auth_context;
571 change_to_root_user();
572 DEBUG(2,("Closing connections\n"));
574 if (negprot_global_auth_context) {
575 (negprot_global_auth_context->free)(&negprot_global_auth_context);
580 invalidate_all_vuids();
582 print_notify_send_messages(3); /* 3 second timeout. */
584 /* run all registered exit events */
585 smb_run_exit_events();
587 /* delete our entry in the connections database. */
588 yield_connection(NULL,"");
590 respond_to_all_remaining_local_messages();
591 decrement_smbd_process_count();
594 if (dcelogin_atmost_once) {
600 int oldlevel = DEBUGLEVEL;
602 DEBUG(0,("Last message was %s\n",smb_fn_name(last_message)));
604 show_msg(last_inbuf);
605 DEBUGLEVEL = oldlevel;
606 DEBUG(0,("===============================================================\n"));
608 if (dump_core()) return;
615 DEBUG(3,("Server exit (%s)\n", (reason ? reason : "")));
619 /****************************************************************************
620 Initialise connect, service and file structs.
621 ****************************************************************************/
623 static BOOL init_structs(void )
626 * Set the machine NETBIOS name if not already
627 * set from the config file.
647 /****************************************************************************
649 ****************************************************************************/
651 /* Declare prototype for build_options() to avoid having to run it through
652 mkproto.h. Mixing $(builddir) and $(srcdir) source files in the current
653 prototype generation system is too complicated. */
655 void build_options(BOOL screen);
657 int main(int argc,const char *argv[])
659 /* shall I run as a daemon */
660 static BOOL is_daemon = False;
661 static BOOL interactive = False;
662 static BOOL Fork = True;
663 static BOOL log_stdout = False;
664 static char *ports = NULL;
668 struct poptOption long_options[] = {
670 {"daemon", 'D', POPT_ARG_VAL, &is_daemon, True, "Become a daemon (default)" },
671 {"interactive", 'i', POPT_ARG_VAL, &interactive, True, "Run interactive (not a daemon)"},
672 {"foreground", 'F', POPT_ARG_VAL, &Fork, False, "Run daemon in foreground (for daemontools & etc)" },
673 {"log-stdout", 'S', POPT_ARG_VAL, &log_stdout, True, "Log to stdout" },
674 {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
675 {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
680 #ifdef HAVE_SET_AUTH_PARAMETERS
681 set_auth_parameters(argc,argv);
684 pc = poptGetContext("smbd", argc, argv, long_options, 0);
686 while((opt = poptGetNextOpt(pc)) != -1) {
689 build_options(True); /* Display output to screen as well as debug */
698 /* needed for SecureWare on SCO */
706 set_remote_machine_name("smbd", False);
713 if (log_stdout && Fork) {
714 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
718 setup_logging(argv[0],log_stdout);
720 /* we want to re-seed early to prevent time delays causing
721 client problems at a later date. (tridge) */
722 generate_random_buffer(NULL, 0, False);
724 /* make absolutely sure we run as root - to handle cases where people
725 are crazy enough to have it setuid */
727 gain_root_privilege();
728 gain_root_group_privilege();
730 fault_setup((void (*)(void *))exit_server);
731 CatchSignal(SIGTERM , SIGNAL_CAST sig_term);
732 CatchSignal(SIGHUP,SIGNAL_CAST sig_hup);
734 /* we are never interested in SIGPIPE */
735 BlockSignals(True,SIGPIPE);
738 /* we are never interested in SIGFPE */
739 BlockSignals(True,SIGFPE);
743 /* We are no longer interested in USR2 */
744 BlockSignals(True,SIGUSR2);
747 /* POSIX demands that signals are inherited. If the invoking process has
748 * these signals masked, we will have problems, as we won't recieve them. */
749 BlockSignals(False, SIGHUP);
750 BlockSignals(False, SIGUSR1);
751 BlockSignals(False, SIGTERM);
753 /* we want total control over the permissions on created files,
754 so set our umask to 0 */
761 DEBUG(0,( "smbd version %s started.\n", SAMBA_VERSION_STRING));
762 DEBUGADD(0,( "Copyright Andrew Tridgell and the Samba Team 1992-2004\n"));
764 DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
765 (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
767 /* Output the build options to the debug log */
768 build_options(False);
770 if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
771 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
776 * Do this before reload_services.
779 if (!reload_services(False))
785 if (!profile_setup(False)) {
786 DEBUG(0,("ERROR: failed to setup profiling\n"));
791 DEBUG(3,( "loaded services\n"));
793 if (!is_daemon && !is_a_socket(0)) {
795 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
798 * Setting is_daemon here prevents us from eventually calling
799 * the open_sockets_inetd()
805 if (is_daemon && !interactive) {
806 DEBUG( 3, ( "Becoming a daemon.\n" ) );
812 * If we're interactive we want to set our own process group for
816 setpgid( (pid_t)0, (pid_t)0);
819 if (!directory_exist(lp_lockdir(), NULL))
820 mkdir(lp_lockdir(), 0755);
823 pidfile_create("smbd");
825 /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
832 if (conn_tdb_ctx() == NULL)
835 if (!locking_init(0))
838 if (!share_info_db_init())
843 if (!init_registry())
846 if (!print_backend_init())
849 /* Setup the main smbd so that we can get messages. */
850 claim_connection(NULL,"",0,True,FLAG_MSG_GENERAL|FLAG_MSG_SMBD);
853 DO NOT ENABLE THIS TILL YOU COPE WITH KILLING THESE TASKS AND INETD
854 THIS *killed* LOTS OF BUILD FARM MACHINES. IT CREATED HUNDREDS OF
855 smbd PROCESSES THAT NEVER DIE
856 start_background_queue();
859 if (!open_sockets_smbd(is_daemon, interactive, ports))
863 * everything after this point is run after the fork()
866 /* Initialise the password backed before the global_sam_sid
867 to ensure that we fetch from ldap before we make a domain sid up */
869 if(!initialize_password_db(False))
872 if(!get_global_sam_sid()) {
873 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
881 /* possibly reload the services file. */
882 reload_services(True);
884 if (!init_account_policy()) {
885 DEBUG(0,("Could not open account policy tdb.\n"));
890 if (sys_chroot(lp_rootdir()) == 0)
891 DEBUG(2,("Changed root to %s\n", lp_rootdir()));
898 /* Setup change notify */
899 if (!init_change_notify())
902 /* re-initialise the timezone */
905 /* register our message handlers */
906 message_register(MSG_SMB_FORCE_TDIS, msg_force_tdis);
910 namecache_shutdown();
911 exit_server("normal exit");