source: branches/samba-3.3.x/source/smbd/server.c@ 223

Last change on this file since 223 was 223, checked in by Herwig Bauernfeind, 16 years ago

Update Samba 3.3 branch to 3.3.3
File size: 38.6 KB
Line 
1/*
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
7 Copyright (C) Volker Lendecke 1993-2007
8 Copyright (C) Jeremy Allison 1993-2007
9
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
14
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
19
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>.
22*/
23
24#include "includes.h"
25
26static_decl_rpc;
27
28static int am_parent = 1;
29
30extern struct auth_context *negprot_global_auth_context;
31extern SIG_ATOMIC_T got_sig_term;
32extern SIG_ATOMIC_T reload_after_sighup;
33static SIG_ATOMIC_T got_sig_cld;
34
35#ifdef WITH_DFS
36extern int dcelogin_atmost_once;
37#endif /* WITH_DFS */
38
39/* really we should have a top level context structure that has the
40 client file descriptor as an element. That would require a major rewrite :(
41
42 the following 2 functions are an alternative - they make the file
43 descriptor private to smbd
44 */
45static int server_fd = -1;
46
47int smbd_server_fd(void)
48{
49 return server_fd;
50}
51
52static void smbd_set_server_fd(int fd)
53{
54 server_fd = fd;
55}
56
57int get_client_fd(void)
58{
59 return server_fd;
60}
61
62#ifdef CLUSTER_SUPPORT
63static int client_get_tcp_info(struct sockaddr_storage *server,
64 struct sockaddr_storage *client)
65{
66 socklen_t length;
67 if (server_fd == -1) {
68 return -1;
69 }
70 length = sizeof(*server);
71 if (getsockname(server_fd, (struct sockaddr *)server, &length) != 0) {
72 return -1;
73 }
74 length = sizeof(*client);
75 if (getpeername(server_fd, (struct sockaddr *)client, &length) != 0) {
76 return -1;
77 }
78 return 0;
79}
80#endif
81
82struct event_context *smbd_event_context(void)
83{
84 static struct event_context *ctx;
85
86 if (!ctx && !(ctx = event_context_init(talloc_autofree_context()))) {
87 smb_panic("Could not init smbd event context");
88 }
89 return ctx;
90}
91
92struct messaging_context *smbd_messaging_context(void)
93{
94 static struct messaging_context *ctx;
95
96 if (ctx == NULL) {
97 ctx = messaging_init(talloc_autofree_context(), server_id_self(),
98 smbd_event_context());
99 }
100 if (ctx == NULL) {
101 DEBUG(0, ("Could not init smbd messaging context.\n"));
102 }
103 return ctx;
104}
105
106struct memcache *smbd_memcache(void)
107{
108 static struct memcache *cache;
109
110 if (!cache
111 && !(cache = memcache_init(talloc_autofree_context(),
112 lp_max_stat_cache_size()*1024))) {
113
114 smb_panic("Could not init smbd memcache");
115 }
116 return cache;
117}
118
119/*******************************************************************
120 What to do when smb.conf is updated.
121 ********************************************************************/
122
123static void smb_conf_updated(struct messaging_context *msg,
124 void *private_data,
125 uint32_t msg_type,
126 struct server_id server_id,
127 DATA_BLOB *data)
128{
129 DEBUG(10,("smb_conf_updated: Got message saying smb.conf was "
130 "updated. Reloading.\n"));
131 reload_services(False);
132}
133
134
135/*******************************************************************
136 Delete a statcache entry.
137 ********************************************************************/
138
139static void smb_stat_cache_delete(struct messaging_context *msg,
140 void *private_data,
141 uint32_t msg_tnype,
142 struct server_id server_id,
143 DATA_BLOB *data)
144{
145 const char *name = (const char *)data->data;
146 DEBUG(10,("smb_stat_cache_delete: delete name %s\n", name));
147 stat_cache_delete(name);
148}
149
150/****************************************************************************
151 Terminate signal.
152****************************************************************************/
153
154static void sig_term(void)
155{
156 got_sig_term = 1;
157 sys_select_signal(SIGTERM);
158}
159
160/****************************************************************************
161 Catch a sighup.
162****************************************************************************/
163
164static void sig_hup(int sig)
165{
166 reload_after_sighup = 1;
167 sys_select_signal(SIGHUP);
168}
169
170/****************************************************************************
171 Catch a sigcld
172****************************************************************************/
173static void sig_cld(int sig)
174{
175 got_sig_cld = 1;
176 sys_select_signal(SIGCLD);
177}
178
179/****************************************************************************
180 Send a SIGTERM to our process group.
181*****************************************************************************/
182
183static void killkids(void)
184{
185 if(am_parent) kill(0,SIGTERM);
186}
187
188/****************************************************************************
189 Process a sam sync message - not sure whether to do this here or
190 somewhere else.
191****************************************************************************/
192
193static void msg_sam_sync(struct messaging_context *msg,
194 void *private_data,
195 uint32_t msg_type,
196 struct server_id server_id,
197 DATA_BLOB *data)
198{
199 DEBUG(10, ("** sam sync message received, ignoring\n"));
200}
201
202
203/****************************************************************************
204 Open the socket communication - inetd.
205****************************************************************************/
206
207static bool open_sockets_inetd(void)
208{
209 /* Started from inetd. fd 0 is the socket. */
210 /* We will abort gracefully when the client or remote system
211 goes away */
212 smbd_set_server_fd(dup(0));
213
214 /* close our standard file descriptors */
215 close_low_fds(False); /* Don't close stderr */
216
217 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
218 set_socket_options(smbd_server_fd(), lp_socket_options());
219
220 return True;
221}
222
223static void msg_exit_server(struct messaging_context *msg,
224 void *private_data,
225 uint32_t msg_type,
226 struct server_id server_id,
227 DATA_BLOB *data)
228{
229 DEBUG(3, ("got a SHUTDOWN message\n"));
230 exit_server_cleanly(NULL);
231}
232
233#ifdef DEVELOPER
234static void msg_inject_fault(struct messaging_context *msg,
235 void *private_data,
236 uint32_t msg_type,
237 struct server_id src,
238 DATA_BLOB *data)
239{
240 int sig;
241
242 if (data->length != sizeof(sig)) {
243
244 DEBUG(0, ("Process %s sent bogus signal injection request\n",
245 procid_str_static(&src)));
246 return;
247 }
248
249 sig = *(int *)data->data;
250 if (sig == -1) {
251 exit_server("internal error injected");
252 return;
253 }
254
255#if HAVE_STRSIGNAL
256 DEBUG(0, ("Process %s requested injection of signal %d (%s)\n",
257 procid_str_static(&src), sig, strsignal(sig)));
258#else
259 DEBUG(0, ("Process %s requested injection of signal %d\n",
260 procid_str_static(&src), sig));
261#endif
262
263 kill(sys_getpid(), sig);
264}
265#endif /* DEVELOPER */
266
267struct child_pid {
268 struct child_pid *prev, *next;
269 pid_t pid;
270};
271
272static struct child_pid *children;
273static int num_children;
274
275static void add_child_pid(pid_t pid)
276{
277 struct child_pid *child;
278
279 if (lp_max_smbd_processes() == 0) {
280 /* Don't bother with the child list if we don't care anyway */
281 return;
282 }
283
284 child = SMB_MALLOC_P(struct child_pid);
285 if (child == NULL) {
286 DEBUG(0, ("Could not add child struct -- malloc failed\n"));
287 return;
288 }
289 child->pid = pid;
290 DLIST_ADD(children, child);
291 num_children += 1;
292}
293
294static void remove_child_pid(pid_t pid, bool unclean_shutdown)
295{
296 struct child_pid *child;
297
298 if (unclean_shutdown) {
299 /* a child terminated uncleanly so tickle all processes to see
300 if they can grab any of the pending locks
301 */
302 DEBUG(3,(__location__ " Unclean shutdown of pid %u\n", (unsigned int)pid));
303 messaging_send_buf(smbd_messaging_context(), procid_self(),
304 MSG_SMB_BRL_VALIDATE, NULL, 0);
305 message_send_all(smbd_messaging_context(),
306 MSG_SMB_UNLOCK, NULL, 0, NULL);
307 }
308
309 if (lp_max_smbd_processes() == 0) {
310 /* Don't bother with the child list if we don't care anyway */
311 return;
312 }
313
314 for (child = children; child != NULL; child = child->next) {
315 if (child->pid == pid) {
316 struct child_pid *tmp = child;
317 DLIST_REMOVE(children, child);
318 SAFE_FREE(tmp);
319 num_children -= 1;
320 return;
321 }
322 }
323
324 DEBUG(0, ("Could not find child %d -- ignoring\n", (int)pid));
325}
326
327/****************************************************************************
328 Have we reached the process limit ?
329****************************************************************************/
330
331static bool allowable_number_of_smbd_processes(void)
332{
333 int max_processes = lp_max_smbd_processes();
334
335 if (!max_processes)
336 return True;
337
338 return num_children < max_processes;
339}
340
341/****************************************************************************
342 Open the socket communication.
343****************************************************************************/
344
345static bool open_sockets_smbd(bool is_daemon, bool interactive, const char *smb_ports)
346{
347 int num_interfaces = iface_count();
348 int num_sockets = 0;
349 int fd_listenset[FD_SETSIZE];
350 fd_set listen_set;
351 int s;
352 int maxfd = 0;
353 int i;
354 char *ports;
355 struct dns_reg_state * dns_reg = NULL;
356 unsigned dns_port = 0;
357
358 if (!is_daemon) {
359 return open_sockets_inetd();
360 }
361
362#ifdef HAVE_ATEXIT
363 {
364 static int atexit_set;
365 if(atexit_set == 0) {
366 atexit_set=1;
367 atexit(killkids);
368 }
369 }
370#endif
371
372 /* Stop zombies */
373 CatchSignal(SIGCLD, sig_cld);
374
375 FD_ZERO(&listen_set);
376
377 /* use a reasonable default set of ports - listing on 445 and 139 */
378 if (!smb_ports) {
379 ports = lp_smb_ports();
380 if (!ports || !*ports) {
381 ports = smb_xstrdup(SMB_PORTS);
382 } else {
383 ports = smb_xstrdup(ports);
384 }
385 } else {
386 ports = smb_xstrdup(smb_ports);
387 }
388
389 if (lp_interfaces() && lp_bind_interfaces_only()) {
390 /* We have been given an interfaces line, and been
391 told to only bind to those interfaces. Create a
392 socket per interface and bind to only these.
393 */
394
395 /* Now open a listen socket for each of the
396 interfaces. */
397 for(i = 0; i < num_interfaces; i++) {
398 TALLOC_CTX *frame = NULL;
399 const struct sockaddr_storage *ifss =
400 iface_n_sockaddr_storage(i);
401 char *tok;
402 const char *ptr;
403
404 if (ifss == NULL) {
405 DEBUG(0,("open_sockets_smbd: "
406 "interface %d has NULL IP address !\n",
407 i));
408 continue;
409 }
410
411 frame = talloc_stackframe();
412 for (ptr=ports;
413 next_token_talloc(frame,&ptr, &tok, " \t,");) {
414 unsigned port = atoi(tok);
415 if (port == 0 || port > 0xffff) {
416 continue;
417 }
418
419 /* Keep the first port for mDNS service
420 * registration.
421 */
422 if (dns_port == 0) {
423 dns_port = port;
424 }
425
426 s = fd_listenset[num_sockets] =
427 open_socket_in(SOCK_STREAM,
428 port,
429 num_sockets == 0 ? 0 : 2,
430 ifss,
431 true);
432 if(s == -1) {
433 continue;
434 }
435
436 /* ready to listen */
437 set_socket_options(s,"SO_KEEPALIVE");
438 set_socket_options(s,lp_socket_options());
439
440 /* Set server socket to
441 * non-blocking for the accept. */
442 set_blocking(s,False);
443
444 if (listen(s, SMBD_LISTEN_BACKLOG) == -1) {
445 DEBUG(0,("open_sockets_smbd: listen: "
446 "%s\n", strerror(errno)));
447 close(s);
448 TALLOC_FREE(frame);
449 return False;
450 }
451 FD_SET(s,&listen_set);
452 maxfd = MAX( maxfd, s);
453
454 num_sockets++;
455 if (num_sockets >= FD_SETSIZE) {
456 DEBUG(0,("open_sockets_smbd: Too "
457 "many sockets to bind to\n"));
458 TALLOC_FREE(frame);
459 return False;
460 }
461 }
462 TALLOC_FREE(frame);
463 }
464 } else {
465 /* Just bind to 0.0.0.0 - accept connections
466 from anywhere. */
467
468 TALLOC_CTX *frame = talloc_stackframe();
469 char *tok;
470 const char *ptr;
471 const char *sock_addr = lp_socket_address();
472 char *sock_tok;
473 const char *sock_ptr;
474
475 if (strequal(sock_addr, "0.0.0.0") ||
476 strequal(sock_addr, "::")) {
477#if HAVE_IPV6
478 sock_addr = "::,0.0.0.0";
479#else
480 sock_addr = "0.0.0.0";
481#endif
482 }
483
484 for (sock_ptr=sock_addr;
485 next_token_talloc(frame, &sock_ptr, &sock_tok, " \t,"); ) {
486 for (ptr=ports; next_token_talloc(frame, &ptr, &tok, " \t,"); ) {
487 struct sockaddr_storage ss;
488
489 unsigned port = atoi(tok);
490 if (port == 0 || port > 0xffff) {
491 continue;
492 }
493
494 /* Keep the first port for mDNS service
495 * registration.
496 */
497 if (dns_port == 0) {
498 dns_port = port;
499 }
500
501 /* open an incoming socket */
502 if (!interpret_string_addr(&ss, sock_tok,
503 AI_NUMERICHOST|AI_PASSIVE)) {
504 continue;
505 }
506
507 s = open_socket_in(SOCK_STREAM,
508 port,
509 num_sockets == 0 ? 0 : 2,
510 &ss,
511 true);
512 if (s == -1) {
513 continue;
514 }
515
516 /* ready to listen */
517 set_socket_options(s,"SO_KEEPALIVE");
518 set_socket_options(s,lp_socket_options());
519
520 /* Set server socket to non-blocking
521 * for the accept. */
522 set_blocking(s,False);
523
524 if (listen(s, SMBD_LISTEN_BACKLOG) == -1) {
525 DEBUG(0,("open_sockets_smbd: "
526 "listen: %s\n",
527 strerror(errno)));
528 close(s);
529 TALLOC_FREE(frame);
530 return False;
531 }
532
533 fd_listenset[num_sockets] = s;
534 FD_SET(s,&listen_set);
535 maxfd = MAX( maxfd, s);
536
537 num_sockets++;
538
539 if (num_sockets >= FD_SETSIZE) {
540 DEBUG(0,("open_sockets_smbd: Too "
541 "many sockets to bind to\n"));
542 TALLOC_FREE(frame);
543 return False;
544 }
545 }
546 }
547 TALLOC_FREE(frame);
548 }
549
550 SAFE_FREE(ports);
551
552 if (num_sockets == 0) {
553 DEBUG(0,("open_sockets_smbd: No "
554 "sockets available to bind to.\n"));
555 return false;
556 }
557
558 /* Setup the main smbd so that we can get messages. Note that
559 do this after starting listening. This is needed as when in
560 clustered mode, ctdb won't allow us to start doing database
561 operations until it has gone thru a full startup, which
562 includes checking to see that smbd is listening. */
563 claim_connection(NULL,"",
564 FLAG_MSG_GENERAL|FLAG_MSG_SMBD|FLAG_MSG_DBWRAP);
565
566 /* Listen to messages */
567
568 messaging_register(smbd_messaging_context(), NULL,
569 MSG_SMB_SAM_SYNC, msg_sam_sync);
570 messaging_register(smbd_messaging_context(), NULL,
571 MSG_SHUTDOWN, msg_exit_server);
572 messaging_register(smbd_messaging_context(), NULL,
573 MSG_SMB_FILE_RENAME, msg_file_was_renamed);
574 messaging_register(smbd_messaging_context(), NULL,
575 MSG_SMB_CONF_UPDATED, smb_conf_updated);
576 messaging_register(smbd_messaging_context(), NULL,
577 MSG_SMB_STAT_CACHE_DELETE, smb_stat_cache_delete);
578 brl_register_msgs(smbd_messaging_context());
579
580#ifdef CLUSTER_SUPPORT
581 if (lp_clustering()) {
582 ctdbd_register_reconfigure(messaging_ctdbd_connection());
583 }
584#endif
585
586#ifdef DEVELOPER
587 messaging_register(smbd_messaging_context(), NULL,
588 MSG_SMB_INJECT_FAULT, msg_inject_fault);
589#endif
590
591 /* Kick off our mDNS registration. */
592 if (dns_port != 0) {
593#ifdef WITH_DNSSD_SUPPORT
594 dns_register_smbd(&dns_reg, dns_port, &maxfd,
595 &r_fds, &idle_timeout);
596#endif
597#ifdef WITH_AVAHI_SUPPORT
598 void *avahi_conn;
599 avahi_conn = avahi_start_register(
600 smbd_event_context(), smbd_event_context(),
601 dns_port);
602 if (avahi_conn == NULL) {
603 DEBUG(10, ("avahi_start_register failed\n"));
604 }
605#endif
606 }
607
608 /* now accept incoming connections - forking a new process
609 for each incoming connection */
610 DEBUG(2,("waiting for a connection\n"));
611 while (1) {
612 struct timeval now, idle_timeout;
613 fd_set r_fds, w_fds;
614 int num;
615
616 /* Ensure we respond to PING and DEBUG messages from the main smbd. */
617 message_dispatch(smbd_messaging_context());
618
619 if (got_sig_cld) {
620 pid_t pid;
621 int status;
622
623 got_sig_cld = False;
624
625 while ((pid = sys_waitpid(-1, &status, WNOHANG)) > 0) {
626 bool unclean_shutdown = False;
627
628 /* If the child terminated normally, assume
629 it was an unclean shutdown unless the
630 status is 0
631 */
632 if (WIFEXITED(status)) {
633 unclean_shutdown = WEXITSTATUS(status);
634 }
635 /* If the child terminated due to a signal
636 we always assume it was unclean.
637 */
638 if (WIFSIGNALED(status)) {
639 unclean_shutdown = True;
640 }
641 remove_child_pid(pid, unclean_shutdown);
642 }
643 }
644
645 idle_timeout = timeval_zero();
646
647 memcpy((char *)&r_fds, (char *)&listen_set,
648 sizeof(listen_set));
649 FD_ZERO(&w_fds);
650 GetTimeOfDay(&now);
651
652 event_add_to_select_args(smbd_event_context(), &now,
653 &r_fds, &w_fds, &idle_timeout,
654 &maxfd);
655
656 num = sys_select(maxfd+1,&r_fds,&w_fds,NULL,
657 timeval_is_zero(&idle_timeout) ?
658 NULL : &idle_timeout);
659
660 if (num == -1 && errno == EINTR) {
661 if (got_sig_term) {
662 exit_server_cleanly(NULL);
663 }
664
665 /* check for sighup processing */
666 if (reload_after_sighup) {
667 change_to_root_user();
668 DEBUG(1,("Reloading services after SIGHUP\n"));
669 reload_services(False);
670 reload_after_sighup = 0;
671 }
672
673 continue;
674 }
675
676
677 /* If the idle timeout fired and we don't have any connected
678 * users, exit gracefully. We should be running under a process
679 * controller that will restart us if necessry.
680 */
681 if (num == 0 && count_all_current_connections() == 0) {
682 exit_server_cleanly("idle timeout");
683 }
684
685 /* process pending nDNS responses */
686 if (dns_register_smbd_reply(dns_reg, &r_fds, &idle_timeout)) {
687 --num;
688 }
689
690 if (run_events(smbd_event_context(), num, &r_fds, &w_fds)) {
691 continue;
692 }
693
694 /* check if we need to reload services */
695 check_reload(time(NULL));
696
697 /* Find the sockets that are read-ready -
698 accept on these. */
699 for( ; num > 0; num--) {
700 struct sockaddr addr;
701 socklen_t in_addrlen = sizeof(addr);
702 pid_t child = 0;
703
704 s = -1;
705 for(i = 0; i < num_sockets; i++) {
706 if(FD_ISSET(fd_listenset[i],&r_fds)) {
707 s = fd_listenset[i];
708 /* Clear this so we don't look
709 at it again. */
710 FD_CLR(fd_listenset[i],&r_fds);
711 break;
712 }
713 }
714
715 smbd_set_server_fd(accept(s,&addr,&in_addrlen));
716
717 if (smbd_server_fd() == -1 && errno == EINTR)
718 continue;
719
720 if (smbd_server_fd() == -1) {
721 DEBUG(2,("open_sockets_smbd: accept: %s\n",
722 strerror(errno)));
723 continue;
724 }
725
726 /* Ensure child is set to blocking mode */
727 set_blocking(smbd_server_fd(),True);
728
729 if (smbd_server_fd() != -1 && interactive)
730 return True;
731
732 if (allowable_number_of_smbd_processes() &&
733 smbd_server_fd() != -1 &&
734 ((child = sys_fork())==0)) {
735 char remaddr[INET6_ADDRSTRLEN];
736
737 /* Child code ... */
738
739 /* Stop zombies, the parent explicitly handles
740 * them, counting worker smbds. */
741 CatchChild();
742
743 /* close the listening socket(s) */
744 for(i = 0; i < num_sockets; i++)
745 close(fd_listenset[i]);
746
747 /* close our mDNS daemon handle */
748 dns_register_close(&dns_reg);
749
750 /* close our standard file
751 descriptors */
752 close_low_fds(False);
753 am_parent = 0;
754
755 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
756 set_socket_options(smbd_server_fd(),
757 lp_socket_options());
758
759 /* this is needed so that we get decent entries
760 in smbstatus for port 445 connects */
761 set_remote_machine_name(get_peer_addr(smbd_server_fd(),
762 remaddr,
763 sizeof(remaddr)),
764 false);
765
766 if (!reinit_after_fork(
767 smbd_messaging_context(),
768 smbd_event_context(),
769 true)) {
770 DEBUG(0,("reinit_after_fork() failed\n"));
771 smb_panic("reinit_after_fork() failed");
772 }
773
774 return True;
775 }
776 /* The parent doesn't need this socket */
777 close(smbd_server_fd());
778
779 /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
780 Clear the closed fd info out of server_fd --
781 and more importantly, out of client_fd in
782 util_sock.c, to avoid a possible
783 getpeername failure if we reopen the logs
784 and use %I in the filename.
785 */
786
787 smbd_set_server_fd(-1);
788
789 if (child != 0) {
790 add_child_pid(child);
791 }
792
793 /* Force parent to check log size after
794 * spawning child. Fix from
795 * klausr@ITAP.Physik.Uni-Stuttgart.De. The
796 * parent smbd will log to logserver.smb. It
797 * writes only two messages for each child
798 * started/finished. But each child writes,
799 * say, 50 messages also in logserver.smb,
800 * begining with the debug_count of the
801 * parent, before the child opens its own log
802 * file logserver.client. In a worst case
803 * scenario the size of logserver.smb would be
804 * checked after about 50*50=2500 messages
805 * (ca. 100kb).
806 * */
807 force_check_log_size();
808
809 } /* end for num */
810 } /* end while 1 */
811
812/* NOTREACHED return True; */
813}
814
815/****************************************************************************
816 Reload printers
817**************************************************************************/
818void reload_printers(void)
819{
820 int snum;
821 int n_services = lp_numservices();
822 int pnum = lp_servicenumber(PRINTERS_NAME);
823 const char *pname;
824
825 pcap_cache_reload();
826
827 /* remove stale printers */
828 for (snum = 0; snum < n_services; snum++) {
829 /* avoid removing PRINTERS_NAME or non-autoloaded printers */
830 if (snum == pnum || !(lp_snum_ok(snum) && lp_print_ok(snum) &&
831 lp_autoloaded(snum)))
832 continue;
833
834 pname = lp_printername(snum);
835 if (!pcap_printername_ok(pname)) {
836 DEBUG(3, ("removing stale printer %s\n", pname));
837
838 if (is_printer_published(NULL, snum, NULL))
839 nt_printer_publish(NULL, snum, SPOOL_DS_UNPUBLISH);
840 del_a_printer(pname);
841 lp_killservice(snum);
842 }
843 }
844
845 load_printers();
846}
847
848/****************************************************************************
849 Reload the services file.
850**************************************************************************/
851
852bool reload_services(bool test)
853{
854 bool ret;
855
856 if (lp_loaded()) {
857 char *fname = lp_configfile();
858 if (file_exist(fname, NULL) &&
859 !strcsequal(fname, get_dyn_CONFIGFILE())) {
860 set_dyn_CONFIGFILE(fname);
861 test = False;
862 }
863 }
864
865 reopen_logs();
866
867 if (test && !lp_file_list_changed())
868 return(True);
869
870 lp_killunused(conn_snum_used);
871
872 ret = lp_load(get_dyn_CONFIGFILE(), False, False, True, True);
873
874 reload_printers();
875
876 /* perhaps the config filename is now set */
877 if (!test)
878 reload_services(True);
879
880 reopen_logs();
881
882 load_interfaces();
883
884 if (smbd_server_fd() != -1) {
885 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
886 set_socket_options(smbd_server_fd(), lp_socket_options());
887 }
888
889 mangle_reset_cache();
890 reset_stat_cache();
891
892 /* this forces service parameters to be flushed */
893 set_current_service(NULL,0,True);
894
895 return(ret);
896}
897
898/****************************************************************************
899 Exit the server.
900****************************************************************************/
901
902/* Reasons for shutting down a server process. */
903enum server_exit_reason { SERVER_EXIT_NORMAL, SERVER_EXIT_ABNORMAL };
904
905static void exit_server_common(enum server_exit_reason how,
906 const char *const reason) NORETURN_ATTRIBUTE;
907
908static void exit_server_common(enum server_exit_reason how,
909 const char *const reason)
910{
911 static int firsttime=1;
912 bool had_open_conn;
913
914 if (!firsttime)
915 exit(0);
916 firsttime = 0;
917
918 change_to_root_user();
919
920 if (negprot_global_auth_context) {
921 (negprot_global_auth_context->free)(&negprot_global_auth_context);
922 }
923
924 had_open_conn = conn_close_all();
925
926 invalidate_all_vuids();
927
928 /* 3 second timeout. */
929 print_notify_send_messages(smbd_messaging_context(), 3);
930
931 /* delete our entry in the connections database. */
932 yield_connection(NULL,"");
933
934 respond_to_all_remaining_local_messages();
935
936#ifdef WITH_DFS
937 if (dcelogin_atmost_once) {
938 dfs_unlogin();
939 }
940#endif
941
942#ifdef USE_DMAPI
943 /* Destroy Samba DMAPI session only if we are master smbd process */
944 if (am_parent) {
945 if (!dmapi_destroy_session()) {
946 DEBUG(0,("Unable to close Samba DMAPI session\n"));
947 }
948 }
949#endif
950
951 locking_end();
952 printing_end();
953
954#ifdef __OS2__
955 /* On OS/2 - we need to remove the PID file on server exit otherwise we may not be able to restart Samba */
956 char pidFile[1024];
957 slprintf(pidFile, sizeof(pidFile)-1, "%s/%s.pid", lp_piddir(), "smbd");
958 unlink(pidFile);
959#endif
960
961 if (how != SERVER_EXIT_NORMAL) {
962 int oldlevel = DEBUGLEVEL;
963
964 DEBUGLEVEL = 10;
965
966 DEBUGSEP(0);
967 DEBUG(0,("Abnormal server exit: %s\n",
968 reason ? reason : "no explanation provided"));
969 DEBUGSEP(0);
970
971 log_stack_trace();
972
973 DEBUGLEVEL = oldlevel;
974 dump_core();
975
976 } else {
977 DEBUG(3,("Server exit (%s)\n",
978 (reason ? reason : "normal exit")));
979 }
980
981 /* if we had any open SMB connections when we exited then we
982 need to tell the parent smbd so that it can trigger a retry
983 of any locks we may have been holding or open files we were
984 blocking */
985 if (had_open_conn) {
986 exit(1);
987 } else {
988 exit(0);
989 }
990}
991
992void exit_server(const char *const explanation)
993{
994 exit_server_common(SERVER_EXIT_ABNORMAL, explanation);
995}
996
997void exit_server_cleanly(const char *const explanation)
998{
999 exit_server_common(SERVER_EXIT_NORMAL, explanation);
1000}
1001
1002void exit_server_fault(void)
1003{
1004 exit_server("critical server fault");
1005}
1006
1007
1008/****************************************************************************
1009received when we should release a specific IP
1010****************************************************************************/
1011static void release_ip(const char *ip, void *priv)
1012{
1013 char addr[INET6_ADDRSTRLEN];
1014
1015 if (strcmp(client_socket_addr(get_client_fd(),addr,sizeof(addr)), ip) == 0) {
1016 /* we can't afford to do a clean exit - that involves
1017 database writes, which would potentially mean we
1018 are still running after the failover has finished -
1019 we have to get rid of this process ID straight
1020 away */
1021 DEBUG(0,("Got release IP message for our IP %s - exiting immediately\n",
1022 ip));
1023 /* note we must exit with non-zero status so the unclean handler gets
1024 called in the parent, so that the brl database is tickled */
1025 _exit(1);
1026 }
1027}
1028
1029static void msg_release_ip(struct messaging_context *msg_ctx, void *private_data,
1030 uint32_t msg_type, struct server_id server_id, DATA_BLOB *data)
1031{
1032 release_ip((char *)data->data, NULL);
1033}
1034
1035/****************************************************************************
1036 Initialise connect, service and file structs.
1037****************************************************************************/
1038
1039static bool init_structs(void )
1040{
1041 /*
1042 * Set the machine NETBIOS name if not already
1043 * set from the config file.
1044 */
1045
1046 if (!init_names())
1047 return False;
1048
1049 conn_init();
1050
1051 file_init();
1052
1053 /* for RPC pipes */
1054 init_rpc_pipe_hnd();
1055
1056 init_dptrs();
1057
1058 if (!secrets_init())
1059 return False;
1060
1061 return True;
1062}
1063
1064/*
1065 * Send keepalive packets to our client
1066 */
1067static bool keepalive_fn(const struct timeval *now, void *private_data)
1068{
1069 if (!send_keepalive(smbd_server_fd())) {
1070 DEBUG( 2, ( "Keepalive failed - exiting.\n" ) );
1071 return False;
1072 }
1073 return True;
1074}
1075
1076/*
1077 * Do the recurring check if we're idle
1078 */
1079static bool deadtime_fn(const struct timeval *now, void *private_data)
1080{
1081 if ((conn_num_open() == 0)
1082 || (conn_idle_all(now->tv_sec))) {
1083 DEBUG( 2, ( "Closing idle connection\n" ) );
1084 messaging_send(smbd_messaging_context(), procid_self(),
1085 MSG_SHUTDOWN, &data_blob_null);
1086 return False;
1087 }
1088
1089 return True;
1090}
1091
1092/*
1093 * Do the recurring log file and smb.conf reload checks.
1094 */
1095
1096static bool housekeeping_fn(const struct timeval *now, void *private_data)
1097{
1098 change_to_root_user();
1099
1100 /* update printer queue caches if necessary */
1101 update_monitored_printq_cache();
1102
1103 /* check if we need to reload services */
1104 check_reload(time(NULL));
1105
1106 /* Change machine password if neccessary. */
1107 attempt_machine_password_change();
1108
1109 /*
1110 * Force a log file check.
1111 */
1112 force_check_log_size();
1113 check_log_size();
1114 return true;
1115}
1116
1117/****************************************************************************
1118 main program.
1119****************************************************************************/
1120
1121/* Declare prototype for build_options() to avoid having to run it through
1122 mkproto.h. Mixing $(builddir) and $(srcdir) source files in the current
1123 prototype generation system is too complicated. */
1124
1125extern void build_options(bool screen);
1126
1127 int main(int argc,const char *argv[])
1128{
1129 /* shall I run as a daemon */
1130 static bool is_daemon = False;
1131 static bool interactive = False;
1132 static bool Fork = True;
1133 static bool no_process_group = False;
1134 static bool log_stdout = False;
1135 static char *ports = NULL;
1136 static char *profile_level = NULL;
1137 int opt;
1138 poptContext pc;
1139 bool print_build_options = False;
1140 enum {
1141 OPT_DAEMON = 1000,
1142 OPT_INTERACTIVE,
1143 OPT_FORK,
1144 OPT_NO_PROCESS_GROUP,
1145 OPT_LOG_STDOUT
1146 };
1147 struct poptOption long_options[] = {
1148 POPT_AUTOHELP
1149 {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1150 {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)"},
1151 {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools, etc.)" },
1152 {"no-process-group", '\0', POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1153 {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1154 {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
1155 {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
1156 {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
1157 POPT_COMMON_SAMBA
1158 POPT_COMMON_DYNCONFIG
1159 POPT_TABLEEND
1160 };
1161 TALLOC_CTX *frame = talloc_stackframe(); /* Setup tos. */
1162
1163 TimeInit();
1164
1165#ifdef HAVE_SET_AUTH_PARAMETERS
1166 set_auth_parameters(argc,argv);
1167#endif
1168
1169 pc = poptGetContext("smbd", argc, argv, long_options, 0);
1170 while((opt = poptGetNextOpt(pc)) != -1) {
1171 switch (opt) {
1172 case OPT_DAEMON:
1173 is_daemon = true;
1174 break;
1175 case OPT_INTERACTIVE:
1176 interactive = true;
1177 break;
1178 case OPT_FORK:
1179 Fork = false;
1180 break;
1181 case OPT_NO_PROCESS_GROUP:
1182 no_process_group = true;
1183 break;
1184 case OPT_LOG_STDOUT:
1185 log_stdout = true;
1186 break;
1187 case 'b':
1188 print_build_options = True;
1189 break;
1190 default:
1191 d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1192 poptBadOption(pc, 0), poptStrerror(opt));
1193 poptPrintUsage(pc, stderr, 0);
1194 exit(1);
1195 }
1196 }
1197 poptFreeContext(pc);
1198
1199 if (interactive) {
1200 Fork = False;
1201 log_stdout = True;
1202 }
1203
1204 setup_logging(argv[0],log_stdout);
1205
1206 if (print_build_options) {
1207 build_options(True); /* Display output to screen as well as debug */
1208 exit(0);
1209 }
1210
1211 load_case_tables();
1212
1213#ifdef HAVE_SETLUID
1214 /* needed for SecureWare on SCO */
1215 setluid(0);
1216#endif
1217
1218 sec_init();
1219
1220 set_remote_machine_name("smbd", False);
1221
1222 if (interactive && (DEBUGLEVEL >= 9)) {
1223 talloc_enable_leak_report();
1224 }
1225
1226 if (log_stdout && Fork) {
1227 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
1228 exit(1);
1229 }
1230
1231 /* we want to re-seed early to prevent time delays causing
1232 client problems at a later date. (tridge) */
1233 generate_random_buffer(NULL, 0);
1234
1235 /* make absolutely sure we run as root - to handle cases where people
1236 are crazy enough to have it setuid */
1237
1238 gain_root_privilege();
1239 gain_root_group_privilege();
1240
1241 fault_setup((void (*)(void *))exit_server_fault);
1242 dump_core_setup("smbd");
1243
1244 CatchSignal(SIGTERM , SIGNAL_CAST sig_term);
1245 CatchSignal(SIGHUP,SIGNAL_CAST sig_hup);
1246
1247 /* we are never interested in SIGPIPE */
1248 BlockSignals(True,SIGPIPE);
1249
1250#if defined(SIGFPE)
1251 /* we are never interested in SIGFPE */
1252 BlockSignals(True,SIGFPE);
1253#endif
1254
1255#if defined(SIGUSR2)
1256 /* We are no longer interested in USR2 */
1257 BlockSignals(True,SIGUSR2);
1258#endif
1259
1260 /* POSIX demands that signals are inherited. If the invoking process has
1261 * these signals masked, we will have problems, as we won't recieve them. */
1262 BlockSignals(False, SIGHUP);
1263 BlockSignals(False, SIGUSR1);
1264 BlockSignals(False, SIGTERM);
1265
1266 /* we want total control over the permissions on created files,
1267 so set our umask to 0 */
1268 umask(0);
1269
1270 init_sec_ctx();
1271
1272 reopen_logs();
1273
1274#ifdef __OS2__
1275 unsigned long _System DosSetPriority (unsigned long ulScope, unsigned long ulClass, long lDelta, unsigned long ulID);
1276 int rc;
1277 rc = DosSetPriority(
1278 0, /* Scope: only one process */
1279 4, /* set to PRTYC_FOREGROUNDSERVER */
1280 0, /* set delta - was 0 */
1281 0); /* Assume current process */
1282 DEBUG(0,( "Server priority set to PRTYC_FOREGROUNDSERVER\n"));
1283#endif
1284
1285 DEBUG(0,("smbd version %s started.\n", SAMBA_VERSION_STRING));
1286 DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1287
1288 DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
1289 (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
1290
1291 /* Output the build options to the debug log */
1292 build_options(False);
1293
1294 if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
1295 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
1296 exit(1);
1297 }
1298
1299 if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1300 DEBUG(0, ("error opening config file\n"));
1301 exit(1);
1302 }
1303
1304 if (smbd_messaging_context() == NULL)
1305 exit(1);
1306
1307 if (!reload_services(False))
1308 return(-1);
1309
1310 init_structs();
1311
1312#ifdef WITH_PROFILE
1313 if (!profile_setup(smbd_messaging_context(), False)) {
1314 DEBUG(0,("ERROR: failed to setup profiling\n"));
1315 return -1;
1316 }
1317 if (profile_level != NULL) {
1318 int pl = atoi(profile_level);
1319 struct server_id src;
1320
1321 DEBUG(1, ("setting profiling level: %s\n",profile_level));
1322 src.pid = getpid();
1323 set_profile_level(pl, src);
1324 }
1325#endif
1326
1327 DEBUG(3,( "loaded services\n"));
1328
1329 if (!is_daemon && !is_a_socket(0)) {
1330 if (!interactive)
1331 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
1332
1333 /*
1334 * Setting is_daemon here prevents us from eventually calling
1335 * the open_sockets_inetd()
1336 */
1337
1338 is_daemon = True;
1339 }
1340
1341 if (is_daemon && !interactive) {
1342 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1343 become_daemon(Fork, no_process_group);
1344 }
1345
1346#if HAVE_SETPGID
1347 /*
1348 * If we're interactive we want to set our own process group for
1349 * signal management.
1350 */
1351 if (interactive && !no_process_group)
1352 setpgid( (pid_t)0, (pid_t)0);
1353#endif
1354
1355 if (!directory_exist(lp_lockdir(), NULL))
1356 mkdir(lp_lockdir(), 0755);
1357
1358 if (is_daemon)
1359 pidfile_create("smbd");
1360
1361 if (!reinit_after_fork(smbd_messaging_context(),
1362 smbd_event_context(), false)) {
1363 DEBUG(0,("reinit_after_fork() failed\n"));
1364 exit(1);
1365 }
1366
1367 /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1368
1369 if (smbd_memcache() == NULL) {
1370 exit(1);
1371 }
1372
1373 memcache_set_global(smbd_memcache());
1374
1375 /* Initialise the password backed before the global_sam_sid
1376 to ensure that we fetch from ldap before we make a domain sid up */
1377
1378 if(!initialize_password_db(False, smbd_event_context()))
1379 exit(1);
1380
1381 if (!secrets_init()) {
1382 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1383 exit(1);
1384 }
1385
1386 if(!get_global_sam_sid()) {
1387 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1388 exit(1);
1389 }
1390
1391 if (!session_init())
1392 exit(1);
1393
1394 if (!connections_init(True))
1395 exit(1);
1396
1397 if (!locking_init())
1398 exit(1);
1399
1400 namecache_enable();
1401
1402 if (!W_ERROR_IS_OK(registry_init_full()))
1403 exit(1);
1404
1405#if 0
1406 if (!init_svcctl_db())
1407 exit(1);
1408#endif
1409
1410 if (!print_backend_init(smbd_messaging_context()))
1411 exit(1);
1412
1413 if (!init_guest_info()) {
1414 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1415 return -1;
1416 }
1417
1418 /* only start the background queue daemon if we are
1419 running as a daemon -- bad things will happen if
1420 smbd is launched via inetd and we fork a copy of
1421 ourselves here */
1422
1423 if (is_daemon && !interactive
1424 && lp_parm_bool(-1, "smbd", "backgroundqueue", true)) {
1425 start_background_queue();
1426 }
1427
1428 if (!open_sockets_smbd(is_daemon, interactive, ports))
1429 exit(1);
1430
1431 /*
1432 * everything after this point is run after the fork()
1433 */
1434
1435 static_init_rpc;
1436
1437 init_modules();
1438
1439 /* Possibly reload the services file. Only worth doing in
1440 * daemon mode. In inetd mode, we know we only just loaded this.
1441 */
1442 if (is_daemon) {
1443 reload_services(True);
1444 }
1445
1446 if (!init_account_policy()) {
1447 DEBUG(0,("Could not open account policy tdb.\n"));
1448 exit(1);
1449 }
1450
1451 if (*lp_rootdir()) {
1452 if (sys_chroot(lp_rootdir()) != 0) {
1453 DEBUG(0,("Failed to change root to %s\n", lp_rootdir()));
1454 exit(1);
1455 }
1456 if (chdir("/") == -1) {
1457 DEBUG(0,("Failed to chdir to / on chroot to %s\n", lp_rootdir()));
1458 exit(1);
1459 }
1460 DEBUG(0,("Changed root to %s\n", lp_rootdir()));
1461 }
1462
1463 /* Setup oplocks */
1464 if (!init_oplocks(smbd_messaging_context()))
1465 exit(1);
1466
1467 /* Setup aio signal handler. */
1468 initialize_async_io_handler();
1469
1470 /* register our message handlers */
1471 messaging_register(smbd_messaging_context(), NULL,
1472 MSG_SMB_FORCE_TDIS, msg_force_tdis);
1473 messaging_register(smbd_messaging_context(), NULL,
1474 MSG_SMB_RELEASE_IP, msg_release_ip);
1475 messaging_register(smbd_messaging_context(), NULL,
1476 MSG_SMB_CLOSE_FILE, msg_close_file);
1477
1478 if ((lp_keepalive() != 0)
1479 && !(event_add_idle(smbd_event_context(), NULL,
1480 timeval_set(lp_keepalive(), 0),
1481 "keepalive", keepalive_fn,
1482 NULL))) {
1483 DEBUG(0, ("Could not add keepalive event\n"));
1484 exit(1);
1485 }
1486
1487 if (!(event_add_idle(smbd_event_context(), NULL,
1488 timeval_set(IDLE_CLOSED_TIMEOUT, 0),
1489 "deadtime", deadtime_fn, NULL))) {
1490 DEBUG(0, ("Could not add deadtime event\n"));
1491 exit(1);
1492 }
1493
1494 if (!(event_add_idle(smbd_event_context(), NULL,
1495 timeval_set(SMBD_SELECT_TIMEOUT, 0),
1496 "housekeeping", housekeeping_fn, NULL))) {
1497 DEBUG(0, ("Could not add housekeeping event\n"));
1498 exit(1);
1499 }
1500
1501#ifdef CLUSTER_SUPPORT
1502
1503 if (lp_clustering()) {
1504 /*
1505 * We need to tell ctdb about our client's TCP
1506 * connection, so that for failover ctdbd can send
1507 * tickle acks, triggering a reconnection by the
1508 * client.
1509 */
1510
1511 struct sockaddr_storage srv, clnt;
1512
1513 if (client_get_tcp_info(&srv, &clnt) == 0) {
1514
1515 NTSTATUS status;
1516
1517 status = ctdbd_register_ips(
1518 messaging_ctdbd_connection(),
1519 &srv, &clnt, release_ip, NULL);
1520
1521 if (!NT_STATUS_IS_OK(status)) {
1522 DEBUG(0, ("ctdbd_register_ips failed: %s\n",
1523 nt_errstr(status)));
1524 }
1525 } else
1526 {
1527 DEBUG(0,("Unable to get tcp info for "
1528 "CTDB_CONTROL_TCP_CLIENT: %s\n",
1529 strerror(errno)));
1530 }
1531 }
1532
1533#endif
1534
1535 TALLOC_FREE(frame);
1536
1537 smbd_process();
1538
1539 namecache_shutdown();
1540
1541 exit_server_cleanly(NULL);
1542 return(0);
1543}
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