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 char *last_inbuf;
34 extern struct auth_context *negprot_global_auth_context;
35 extern pstring user_socket_options;
36 extern SIG_ATOMIC_T got_sig_term;
37 extern SIG_ATOMIC_T reload_after_sighup;
40 extern int dcelogin_atmost_once;
43 /* really we should have a top level context structure that has the
44 client file descriptor as an element. That would require a major rewrite :(
46 the following 2 functions are an alternative - they make the file
47 descriptor private to smbd
49 static int server_fd = -1;
51 int smbd_server_fd(void)
56 static void smbd_set_server_fd(int fd)
62 /****************************************************************************
64 ****************************************************************************/
66 static void sig_term(void)
72 /****************************************************************************
74 ****************************************************************************/
76 static void sig_hup(int sig)
78 reload_after_sighup = 1;
82 /****************************************************************************
83 Send a SIGTERM to our process group.
84 *****************************************************************************/
86 static void killkids(void)
88 if(am_parent) kill(0,SIGTERM);
91 /****************************************************************************
92 Process a sam sync message - not sure whether to do this here or
94 ****************************************************************************/
96 static void msg_sam_sync(int UNUSED(msg_type), pid_t UNUSED(pid),
97 void *UNUSED(buf), size_t UNUSED(len))
99 DEBUG(10, ("** sam sync message received, ignoring\n"));
102 /****************************************************************************
103 Process a sam sync replicate message - not sure whether to do this here or
105 ****************************************************************************/
107 static void msg_sam_repl(int msg_type, pid_t pid, void *buf, size_t len)
111 if (len != sizeof(uint32))
114 low_serial = *((uint32 *)buf);
116 DEBUG(3, ("received sam replication message, serial = 0x%04x\n",
120 /****************************************************************************
121 Open the socket communication - inetd.
122 ****************************************************************************/
124 static BOOL open_sockets_inetd(void)
126 /* Started from inetd. fd 0 is the socket. */
127 /* We will abort gracefully when the client or remote system
129 smbd_set_server_fd(dup(0));
131 /* close our standard file descriptors */
132 close_low_fds(False); /* Don't close stderr */
134 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
135 set_socket_options(smbd_server_fd(), user_socket_options);
140 static void msg_exit_server(int msg_type, pid_t src, void *buf, size_t len)
142 exit_server("Got a SHUTDOWN message");
146 /****************************************************************************
147 Have we reached the process limit ?
148 ****************************************************************************/
150 static BOOL allowable_number_of_smbd_processes(void)
152 int max_processes = lp_max_smbd_processes();
158 TDB_CONTEXT *tdb = conn_tdb_ctx();
161 DEBUG(0,("allowable_number_of_smbd_processes: can't open connection tdb.\n" ));
165 val = tdb_fetch_int32(tdb, "INFO/total_smbds");
166 if (val == -1 && (tdb_error(tdb) != TDB_ERR_NOEXIST)) {
167 DEBUG(0,("allowable_number_of_smbd_processes: can't fetch INFO/total_smbds. Error %s\n",
168 tdb_errorstr(tdb) ));
171 if (val > max_processes) {
172 DEBUG(0,("allowable_number_of_smbd_processes: number of processes (%d) is over allowed limit (%d)\n",
173 val, max_processes ));
180 /****************************************************************************
181 Open the socket communication.
182 ****************************************************************************/
184 static BOOL open_sockets_smbd(BOOL is_daemon, BOOL interactive, const char *smb_ports)
186 int num_interfaces = iface_count();
188 int fd_listenset[FD_SETSIZE];
196 return open_sockets_inetd();
202 static int atexit_set;
203 if(atexit_set == 0) {
213 FD_ZERO(&listen_set);
215 /* use a reasonable default set of ports - listing on 445 and 139 */
217 ports = lp_smb_ports();
218 if (!ports || !*ports) {
219 ports = smb_xstrdup(SMB_PORTS);
221 ports = smb_xstrdup(ports);
224 ports = smb_xstrdup(smb_ports);
227 if (lp_interfaces() && lp_bind_interfaces_only()) {
228 /* We have been given an interfaces line, and been
229 told to only bind to those interfaces. Create a
230 socket per interface and bind to only these.
233 /* Now open a listen socket for each of the
235 for(i = 0; i < num_interfaces; i++) {
236 struct in_addr *ifip = iface_n_ip(i);
241 DEBUG(0,("open_sockets_smbd: interface %d has NULL IP address !\n", i));
245 for (ptr=ports; next_token(&ptr, tok, NULL, sizeof(tok)); ) {
246 unsigned port = atoi(tok);
250 s = fd_listenset[num_sockets] = open_socket_in(SOCK_STREAM, port, 0, ifip->s_addr, True);
254 /* ready to listen */
255 set_socket_options(s,"SO_KEEPALIVE");
256 set_socket_options(s,user_socket_options);
258 /* Set server socket to non-blocking for the accept. */
259 set_blocking(s,False);
261 if (listen(s, SMBD_LISTEN_BACKLOG) == -1) {
262 DEBUG(0,("listen: %s\n",strerror(errno)));
266 FD_SET(s,&listen_set);
267 maxfd = MAX( maxfd, s);
270 if (num_sockets >= FD_SETSIZE) {
271 DEBUG(0,("open_sockets_smbd: Too many sockets to bind to\n"));
277 /* Just bind to 0.0.0.0 - accept connections
285 for (ptr=ports; next_token(&ptr, tok, NULL, sizeof(tok)); ) {
286 unsigned port = atoi(tok);
287 if (port == 0) continue;
288 /* open an incoming socket */
289 s = open_socket_in(SOCK_STREAM, port, 0,
290 interpret_addr(lp_socket_address()),True);
294 /* ready to listen */
295 set_socket_options(s,"SO_KEEPALIVE");
296 set_socket_options(s,user_socket_options);
298 /* Set server socket to non-blocking for the accept. */
299 set_blocking(s,False);
301 if (listen(s, SMBD_LISTEN_BACKLOG) == -1) {
302 DEBUG(0,("open_sockets_smbd: listen: %s\n",
308 fd_listenset[num_sockets] = s;
309 FD_SET(s,&listen_set);
310 maxfd = MAX( maxfd, s);
314 if (num_sockets >= FD_SETSIZE) {
315 DEBUG(0,("open_sockets_smbd: Too many sockets to bind to\n"));
323 /* Listen to messages */
325 message_register(MSG_SMB_SAM_SYNC, msg_sam_sync);
326 message_register(MSG_SMB_SAM_REPL, msg_sam_repl);
327 message_register(MSG_SHUTDOWN, msg_exit_server);
329 /* now accept incoming connections - forking a new process
330 for each incoming connection */
331 DEBUG(2,("waiting for a connection\n"));
336 /* Free up temporary memory from the main smbd. */
339 /* Ensure we respond to PING and DEBUG messages from the main smbd. */
342 memcpy((char *)&lfds, (char *)&listen_set,
345 num = sys_select(maxfd+1,&lfds,NULL,NULL,NULL);
347 if (num == -1 && errno == EINTR) {
349 exit_server("Caught TERM signal");
352 /* check for sighup processing */
353 if (reload_after_sighup) {
354 change_to_root_user();
355 DEBUG(1,("Reloading services after SIGHUP\n"));
356 reload_services(False);
357 reload_after_sighup = 0;
363 /* check if we need to reload services */
364 check_reload(time(NULL));
366 /* Find the sockets that are read-ready -
368 for( ; num > 0; num--) {
369 struct sockaddr addr;
370 socklen_t in_addrlen = sizeof(addr);
373 for(i = 0; i < num_sockets; i++) {
374 if(FD_ISSET(fd_listenset[i],&lfds)) {
376 /* Clear this so we don't look
378 FD_CLR(fd_listenset[i],&lfds);
383 smbd_set_server_fd(accept(s,&addr,&in_addrlen));
385 if (smbd_server_fd() == -1 && errno == EINTR)
388 if (smbd_server_fd() == -1) {
389 DEBUG(0,("open_sockets_smbd: accept: %s\n",
394 /* Ensure child is set to blocking mode */
395 set_blocking(smbd_server_fd(),True);
397 if (smbd_server_fd() != -1 && interactive)
400 if (allowable_number_of_smbd_processes() && smbd_server_fd() != -1 && sys_fork()==0) {
403 /* close the listening socket(s) */
404 for(i = 0; i < num_sockets; i++)
405 close(fd_listenset[i]);
407 /* close our standard file
409 close_low_fds(False);
412 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
413 set_socket_options(smbd_server_fd(),user_socket_options);
415 /* this is needed so that we get decent entries
416 in smbstatus for port 445 connects */
417 set_remote_machine_name(get_peer_addr(smbd_server_fd()), False);
419 /* Reset the state of the random
420 * number generation system, so
421 * children do not get the same random
422 * numbers as each other */
424 set_need_random_reseed();
425 /* tdb needs special fork handling - remove CLEAR_IF_FIRST flags */
426 if (tdb_reopen_all() == -1) {
427 DEBUG(0,("tdb_reopen_all failed.\n"));
428 smb_panic("tdb_reopen_all failed.");
433 /* The parent doesn't need this socket */
434 close(smbd_server_fd());
436 /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
437 Clear the closed fd info out of server_fd --
438 and more importantly, out of client_fd in
439 util_sock.c, to avoid a possible
440 getpeername failure if we reopen the logs
441 and use %I in the filename.
444 smbd_set_server_fd(-1);
446 /* Force parent to check log size after
447 * spawning child. Fix from
448 * klausr@ITAP.Physik.Uni-Stuttgart.De. The
449 * parent smbd will log to logserver.smb. It
450 * writes only two messages for each child
451 * started/finished. But each child writes,
452 * say, 50 messages also in logserver.smb,
453 * begining with the debug_count of the
454 * parent, before the child opens its own log
455 * file logserver.client. In a worst case
456 * scenario the size of logserver.smb would be
457 * checked after about 50*50=2500 messages
460 force_check_log_size();
465 /* NOTREACHED return True; */
468 /****************************************************************************
470 **************************************************************************/
471 void reload_printers(void)
474 int n_services = lp_numservices();
475 int pnum = lp_servicenumber(PRINTERS_NAME);
480 /* remove stale printers */
481 for (snum = 0; snum < n_services; snum++) {
482 /* avoid removing PRINTERS_NAME or non-autoloaded printers */
483 if (snum == pnum || !(lp_snum_ok(snum) && lp_print_ok(snum) &&
484 lp_autoloaded(snum)))
487 pname = lp_printername(snum);
488 if (!pcap_printername_ok(pname)) {
489 DEBUG(3, ("removing stale printer %s\n", pname));
491 if (is_printer_published(NULL, snum, NULL))
492 nt_printer_publish(NULL, snum, SPOOL_DS_UNPUBLISH);
493 del_a_printer(pname);
494 lp_killservice(snum);
501 /****************************************************************************
502 Reload the services file.
503 **************************************************************************/
505 BOOL reload_services(BOOL test)
511 pstrcpy(fname,lp_configfile());
512 if (file_exist(fname, NULL) &&
513 !strcsequal(fname, dyn_CONFIGFILE)) {
514 pstrcpy(dyn_CONFIGFILE, fname);
521 if (test && !lp_file_list_changed())
524 lp_killunused(conn_snum_used);
526 ret = lp_load(dyn_CONFIGFILE, False, False, True);
530 /* perhaps the config filename is now set */
532 reload_services(True);
538 if (smbd_server_fd() != -1) {
539 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
540 set_socket_options(smbd_server_fd(), user_socket_options);
543 mangle_reset_cache();
546 /* this forces service parameters to be flushed */
547 set_current_service(NULL,0,True);
554 /*******************************************************************
555 prepare to dump a core file - carefully!
556 ********************************************************************/
557 static BOOL dump_core(void)
562 pstrcpy(dname,lp_logfile());
563 if ((p=strrchr_m(dname,'/'))) *p=0;
564 pstrcat(dname,"/corefiles");
566 sys_chown(dname,getuid(),getgid());
568 if (chdir(dname)) return(False);
571 #ifdef HAVE_GETRLIMIT
575 getrlimit(RLIMIT_CORE, &rlp);
576 rlp.rlim_cur = MAX(4*1024*1024,rlp.rlim_cur);
577 setrlimit(RLIMIT_CORE, &rlp);
578 getrlimit(RLIMIT_CORE, &rlp);
579 DEBUG(3,("Core limits now %d %d\n",
580 (int)rlp.rlim_cur,(int)rlp.rlim_max));
586 DEBUG(0,("Dumping core in %s\n", dname));
587 /* Ensure we don't have a signal handler for abort. */
589 CatchSignal(SIGABRT,SIGNAL_CAST SIG_DFL);
596 /****************************************************************************
598 ****************************************************************************/
600 void exit_server(const char *reason)
602 static int firsttime=1;
608 change_to_root_user();
609 DEBUG(2,("Closing connections\n"));
611 if (negprot_global_auth_context) {
612 (negprot_global_auth_context->free)(&negprot_global_auth_context);
617 invalidate_all_vuids();
619 print_notify_send_messages(3); /* 3 second timeout. */
621 /* run all registered exit events */
622 smb_run_exit_events();
624 /* delete our entry in the connections database. */
625 yield_connection(NULL,"");
627 respond_to_all_remaining_local_messages();
628 decrement_smbd_process_count();
631 if (dcelogin_atmost_once) {
637 int oldlevel = DEBUGLEVEL;
639 DEBUG(0,("Last message was %s\n",smb_fn_name(last_message)));
641 show_msg(last_inbuf);
642 DEBUGLEVEL = oldlevel;
643 DEBUG(0,("===============================================================\n"));
645 if (dump_core()) return;
652 DEBUG(3,("Server exit (%s)\n", (reason ? reason : "")));
656 /****************************************************************************
657 Initialise connect, service and file structs.
658 ****************************************************************************/
660 static BOOL init_structs(void )
663 * Set the machine NETBIOS name if not already
664 * set from the config file.
684 /****************************************************************************
686 ****************************************************************************/
688 /* Declare prototype for build_options() to avoid having to run it through
689 mkproto.h. Mixing $(builddir) and $(srcdir) source files in the current
690 prototype generation system is too complicated. */
692 void build_options(BOOL screen);
694 int main(int argc,const char *argv[])
696 /* shall I run as a daemon */
697 static BOOL is_daemon = False;
698 static BOOL interactive = False;
699 static BOOL Fork = True;
700 static BOOL log_stdout = False;
701 static char *ports = NULL;
705 struct poptOption long_options[] = {
707 {"daemon", 'D', POPT_ARG_VAL, &is_daemon, True, "Become a daemon (default)" },
708 {"interactive", 'i', POPT_ARG_VAL, &interactive, True, "Run interactive (not a daemon)"},
709 {"foreground", 'F', POPT_ARG_VAL, &Fork, False, "Run daemon in foreground (for daemontools & etc)" },
710 {"log-stdout", 'S', POPT_ARG_VAL, &log_stdout, True, "Log to stdout" },
711 {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
712 {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
717 #ifdef HAVE_SET_AUTH_PARAMETERS
718 set_auth_parameters(argc,argv);
721 pc = poptGetContext("smbd", argc, argv, long_options, 0);
723 while((opt = poptGetNextOpt(pc)) != -1) {
726 build_options(True); /* Display output to screen as well as debug */
735 /* needed for SecureWare on SCO */
743 set_remote_machine_name("smbd", False);
750 if (log_stdout && Fork) {
751 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
755 setup_logging(argv[0],log_stdout);
757 /* we want to re-seed early to prevent time delays causing
758 client problems at a later date. (tridge) */
759 generate_random_buffer(NULL, 0);
761 /* make absolutely sure we run as root - to handle cases where people
762 are crazy enough to have it setuid */
764 gain_root_privilege();
765 gain_root_group_privilege();
767 fault_setup((void (*)(void *))exit_server);
768 CatchSignal(SIGTERM , SIGNAL_CAST sig_term);
769 CatchSignal(SIGHUP,SIGNAL_CAST sig_hup);
771 /* we are never interested in SIGPIPE */
772 BlockSignals(True,SIGPIPE);
775 /* we are never interested in SIGFPE */
776 BlockSignals(True,SIGFPE);
780 /* We are no longer interested in USR2 */
781 BlockSignals(True,SIGUSR2);
784 /* POSIX demands that signals are inherited. If the invoking process has
785 * these signals masked, we will have problems, as we won't recieve them. */
786 BlockSignals(False, SIGHUP);
787 BlockSignals(False, SIGUSR1);
788 BlockSignals(False, SIGTERM);
790 /* we want total control over the permissions on created files,
791 so set our umask to 0 */
798 DEBUG(0,( "smbd version %s started.\n", SAMBA_VERSION_STRING));
799 DEBUGADD(0,( "Copyright Andrew Tridgell and the Samba Team 1992-2004\n"));
801 DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
802 (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
804 /* Output the build options to the debug log */
805 build_options(False);
807 if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
808 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
813 * Do this before reload_services.
816 if (!reload_services(False))
821 if (!init_guest_info())
825 if (!profile_setup(False)) {
826 DEBUG(0,("ERROR: failed to setup profiling\n"));
831 DEBUG(3,( "loaded services\n"));
833 if (!is_daemon && !is_a_socket(0)) {
835 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
838 * Setting is_daemon here prevents us from eventually calling
839 * the open_sockets_inetd()
845 if (is_daemon && !interactive) {
846 DEBUG( 3, ( "Becoming a daemon.\n" ) );
852 * If we're interactive we want to set our own process group for
856 setpgid( (pid_t)0, (pid_t)0);
859 if (!directory_exist(lp_lockdir(), NULL))
860 mkdir(lp_lockdir(), 0755);
863 pidfile_create("smbd");
865 /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
872 if (conn_tdb_ctx() == NULL)
875 if (!locking_init(0))
878 if (!share_info_db_init())
883 if (!init_registry())
886 if (!print_backend_init())
889 /* Setup the main smbd so that we can get messages. */
890 /* don't worry about general printing messages here */
892 claim_connection(NULL,"",0,True,FLAG_MSG_GENERAL|FLAG_MSG_SMBD);
894 /* only start the background queue daemon if we are
895 running as a daemon -- bad things will happen if
896 smbd is launched via inetd and we fork a copy of
899 if ( is_daemon && !interactive )
900 start_background_queue();
902 if (!open_sockets_smbd(is_daemon, interactive, ports))
906 * everything after this point is run after the fork()
909 /* Initialise the password backed before the global_sam_sid
910 to ensure that we fetch from ldap before we make a domain sid up */
912 if(!initialize_password_db(False))
915 if(!get_global_sam_sid()) {
916 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
924 /* possibly reload the services file. */
925 reload_services(True);
927 if (!init_account_policy()) {
928 DEBUG(0,("Could not open account policy tdb.\n"));
933 if (sys_chroot(lp_rootdir()) == 0)
934 DEBUG(2,("Changed root to %s\n", lp_rootdir()));
941 /* Setup change notify */
942 if (!init_change_notify())
945 /* re-initialise the timezone */
948 /* register our message handlers */
949 message_register(MSG_SMB_FORCE_TDIS, msg_force_tdis);
953 namecache_shutdown();
956 TALLOC_CTX *mem_ctx = talloc_init("end_description");
957 char *description = talloc_describe_all(mem_ctx);
959 DEBUG(3, ("tallocs left:\n%s\n", description));
960 talloc_destroy(mem_ctx);
963 exit_server("normal exit");