source: branches/samba-3.5.x/source3/smbd/server.c@ 776

Last change on this file since 776 was 776, checked in by Silvan Scherrer, 12 years ago

Samba 3.5: remove removing pid, add an important return
File size: 34.3 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#include "smbd/globals.h"
26
27static_decl_rpc;
28
29#ifdef WITH_DFS
30extern int dcelogin_atmost_once;
31#endif /* WITH_DFS */
32
33int smbd_server_fd(void)
34{
35 return server_fd;
36}
37
38static void smbd_set_server_fd(int fd)
39{
40 server_fd = fd;
41}
42
43int get_client_fd(void)
44{
45 return server_fd;
46}
47
48struct event_context *smbd_event_context(void)
49{
50 if (!smbd_event_ctx) {
51 smbd_event_ctx = event_context_init(talloc_autofree_context());
52 }
53 if (!smbd_event_ctx) {
54 smb_panic("Could not init smbd event context");
55 }
56 return smbd_event_ctx;
57}
58
59struct messaging_context *smbd_messaging_context(void)
60{
61 if (smbd_msg_ctx == NULL) {
62 smbd_msg_ctx = messaging_init(talloc_autofree_context(),
63 server_id_self(),
64 smbd_event_context());
65 }
66 if (smbd_msg_ctx == NULL) {
67 DEBUG(0, ("Could not init smbd messaging context.\n"));
68 }
69 return smbd_msg_ctx;
70}
71
72struct memcache *smbd_memcache(void)
73{
74 if (!smbd_memcache_ctx) {
75 smbd_memcache_ctx = memcache_init(talloc_autofree_context(),
76 lp_max_stat_cache_size()*1024);
77 }
78 if (!smbd_memcache_ctx) {
79 smb_panic("Could not init smbd memcache");
80 }
81
82 return smbd_memcache_ctx;
83}
84
85/*******************************************************************
86 What to do when smb.conf is updated.
87 ********************************************************************/
88
89static void smb_conf_updated(struct messaging_context *msg,
90 void *private_data,
91 uint32_t msg_type,
92 struct server_id server_id,
93 DATA_BLOB *data)
94{
95 DEBUG(10,("smb_conf_updated: Got message saying smb.conf was "
96 "updated. Reloading.\n"));
97 change_to_root_user();
98 reload_services(False);
99}
100
101
102/*******************************************************************
103 Delete a statcache entry.
104 ********************************************************************/
105
106static void smb_stat_cache_delete(struct messaging_context *msg,
107 void *private_data,
108 uint32_t msg_tnype,
109 struct server_id server_id,
110 DATA_BLOB *data)
111{
112 const char *name = (const char *)data->data;
113 DEBUG(10,("smb_stat_cache_delete: delete name %s\n", name));
114 stat_cache_delete(name);
115}
116
117/****************************************************************************
118 Send a SIGTERM to our process group.
119*****************************************************************************/
120
121static void killkids(void)
122{
123 if(am_parent) kill(0,SIGTERM);
124}
125
126/****************************************************************************
127 Process a sam sync message - not sure whether to do this here or
128 somewhere else.
129****************************************************************************/
130
131static void msg_sam_sync(struct messaging_context *msg,
132 void *private_data,
133 uint32_t msg_type,
134 struct server_id server_id,
135 DATA_BLOB *data)
136{
137 DEBUG(10, ("** sam sync message received, ignoring\n"));
138}
139
140static void msg_exit_server(struct messaging_context *msg,
141 void *private_data,
142 uint32_t msg_type,
143 struct server_id server_id,
144 DATA_BLOB *data)
145{
146 DEBUG(3, ("got a SHUTDOWN message\n"));
147 exit_server_cleanly(NULL);
148}
149
150#ifdef DEVELOPER
151static void msg_inject_fault(struct messaging_context *msg,
152 void *private_data,
153 uint32_t msg_type,
154 struct server_id src,
155 DATA_BLOB *data)
156{
157 int sig;
158
159 if (data->length != sizeof(sig)) {
160
161 DEBUG(0, ("Process %s sent bogus signal injection request\n",
162 procid_str_static(&src)));
163 return;
164 }
165
166 sig = *(int *)data->data;
167 if (sig == -1) {
168 exit_server("internal error injected");
169 return;
170 }
171
172#if HAVE_STRSIGNAL
173 DEBUG(0, ("Process %s requested injection of signal %d (%s)\n",
174 procid_str_static(&src), sig, strsignal(sig)));
175#else
176 DEBUG(0, ("Process %s requested injection of signal %d\n",
177 procid_str_static(&src), sig));
178#endif
179
180 kill(sys_getpid(), sig);
181}
182#endif /* DEVELOPER */
183
184/*
185 * Parent smbd process sets its own debug level first and then
186 * sends a message to all the smbd children to adjust their debug
187 * level to that of the parent.
188 */
189
190static void smbd_msg_debug(struct messaging_context *msg_ctx,
191 void *private_data,
192 uint32_t msg_type,
193 struct server_id server_id,
194 DATA_BLOB *data)
195{
196 struct child_pid *child;
197
198 debug_message(msg_ctx, private_data, MSG_DEBUG, server_id, data);
199
200 for (child = children; child != NULL; child = child->next) {
201 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
202 MSG_DEBUG,
203 data->data,
204 strlen((char *) data->data) + 1);
205 }
206}
207
208static void add_child_pid(pid_t pid)
209{
210 struct child_pid *child;
211
212 child = SMB_MALLOC_P(struct child_pid);
213 if (child == NULL) {
214 DEBUG(0, ("Could not add child struct -- malloc failed\n"));
215 return;
216 }
217 child->pid = pid;
218 DLIST_ADD(children, child);
219 num_children += 1;
220}
221
222/*
223 at most every smbd:cleanuptime seconds (default 20), we scan the BRL
224 and locking database for entries to cleanup. As a side effect this
225 also cleans up dead entries in the connections database (due to the
226 traversal in message_send_all()
227
228 Using a timer for this prevents a flood of traversals when a large
229 number of clients disconnect at the same time (perhaps due to a
230 network outage).
231*/
232
233static void cleanup_timeout_fn(struct event_context *event_ctx,
234 struct timed_event *te,
235 struct timeval now,
236 void *private_data)
237{
238 struct timed_event **cleanup_te = (struct timed_event **)private_data;
239
240 DEBUG(1,("Cleaning up brl and lock database after unclean shutdown\n"));
241 message_send_all(smbd_messaging_context(), MSG_SMB_UNLOCK, NULL, 0, NULL);
242 messaging_send_buf(smbd_messaging_context(), procid_self(),
243 MSG_SMB_BRL_VALIDATE, NULL, 0);
244 /* mark the cleanup as having been done */
245 (*cleanup_te) = NULL;
246}
247
248static void remove_child_pid(pid_t pid, bool unclean_shutdown)
249{
250 struct child_pid *child;
251 static struct timed_event *cleanup_te;
252
253 if (unclean_shutdown) {
254 /* a child terminated uncleanly so tickle all
255 processes to see if they can grab any of the
256 pending locks
257 */
258 DEBUG(3,(__location__ " Unclean shutdown of pid %u\n",
259 (unsigned int)pid));
260 if (!cleanup_te) {
261 /* call the cleanup timer, but not too often */
262 int cleanup_time = lp_parm_int(-1, "smbd", "cleanuptime", 20);
263 cleanup_te = event_add_timed(smbd_event_context(), NULL,
264 timeval_current_ofs(cleanup_time, 0),
265 cleanup_timeout_fn,
266 &cleanup_te);
267 DEBUG(1,("Scheduled cleanup of brl and lock database after unclean shutdown\n"));
268 }
269 }
270
271 for (child = children; child != NULL; child = child->next) {
272 if (child->pid == pid) {
273 struct child_pid *tmp = child;
274 DLIST_REMOVE(children, child);
275 SAFE_FREE(tmp);
276 num_children -= 1;
277 return;
278 }
279 }
280
281 /* not all forked child processes are added to the children list */
282 DEBUG(1, ("Could not find child %d -- ignoring\n", (int)pid));
283}
284
285/****************************************************************************
286 Have we reached the process limit ?
287****************************************************************************/
288
289static bool allowable_number_of_smbd_processes(void)
290{
291 int max_processes = lp_max_smbd_processes();
292
293 if (!max_processes)
294 return True;
295
296 return num_children < max_processes;
297}
298
299static void smbd_sig_chld_handler(struct tevent_context *ev,
300 struct tevent_signal *se,
301 int signum,
302 int count,
303 void *siginfo,
304 void *private_data)
305{
306 pid_t pid;
307 int status;
308
309 while ((pid = sys_waitpid(-1, &status, WNOHANG)) > 0) {
310 bool unclean_shutdown = False;
311
312 /* If the child terminated normally, assume
313 it was an unclean shutdown unless the
314 status is 0
315 */
316 if (WIFEXITED(status)) {
317 unclean_shutdown = WEXITSTATUS(status);
318 }
319 /* If the child terminated due to a signal
320 we always assume it was unclean.
321 */
322 if (WIFSIGNALED(status)) {
323 unclean_shutdown = True;
324 }
325 remove_child_pid(pid, unclean_shutdown);
326 }
327}
328
329static void smbd_setup_sig_chld_handler(void)
330{
331 struct tevent_signal *se;
332
333 se = tevent_add_signal(smbd_event_context(),
334 smbd_event_context(),
335 SIGCHLD, 0,
336 smbd_sig_chld_handler,
337 NULL);
338 if (!se) {
339 exit_server("failed to setup SIGCHLD handler");
340 }
341}
342
343struct smbd_open_socket;
344
345struct smbd_parent_context {
346 bool interactive;
347
348 /* the list of listening sockets */
349 struct smbd_open_socket *sockets;
350};
351
352struct smbd_open_socket {
353 struct smbd_open_socket *prev, *next;
354 struct smbd_parent_context *parent;
355 int fd;
356 struct tevent_fd *fde;
357};
358
359static void smbd_open_socket_close_fn(struct tevent_context *ev,
360 struct tevent_fd *fde,
361 int fd,
362 void *private_data)
363{
364 /* this might be the socket_wrapper swrap_close() */
365 close(fd);
366}
367
368static void smbd_accept_connection(struct tevent_context *ev,
369 struct tevent_fd *fde,
370 uint16_t flags,
371 void *private_data)
372{
373 struct smbd_open_socket *s = talloc_get_type_abort(private_data,
374 struct smbd_open_socket);
375 struct sockaddr_storage addr;
376 socklen_t in_addrlen = sizeof(addr);
377 pid_t pid = 0;
378
379 smbd_set_server_fd(accept(s->fd,(struct sockaddr *)&addr,&in_addrlen));
380
381 if (smbd_server_fd() == -1 && errno == EINTR)
382 return;
383
384 if (smbd_server_fd() == -1) {
385 DEBUG(0,("open_sockets_smbd: accept: %s\n",
386 strerror(errno)));
387 return;
388 }
389
390 if (s->parent->interactive) {
391 smbd_process();
392 exit_server_cleanly("end of interactive mode");
393 return;
394 }
395
396 if (!allowable_number_of_smbd_processes()) {
397 close(smbd_server_fd());
398 smbd_set_server_fd(-1);
399 return;
400 }
401
402 pid = sys_fork();
403 if (pid == 0) {
404 NTSTATUS status = NT_STATUS_OK;
405 /* Child code ... */
406 am_parent = 0;
407
408 /* Stop zombies, the parent explicitly handles
409 * them, counting worker smbds. */
410 CatchChild();
411
412 /* close our standard file
413 descriptors */
414 close_low_fds(False);
415
416 /*
417 * Can't use TALLOC_FREE here. Nulling out the argument to it
418 * would overwrite memory we've just freed.
419 */
420 talloc_free(s->parent);
421 s = NULL;
422
423 status = reinit_after_fork(smbd_messaging_context(),
424 smbd_event_context(), true);
425 if (!NT_STATUS_IS_OK(status)) {
426 if (NT_STATUS_EQUAL(status,
427 NT_STATUS_TOO_MANY_OPENED_FILES)) {
428 DEBUG(0,("child process cannot initialize "
429 "because too many files are open\n"));
430 goto exit;
431 }
432 DEBUG(0,("reinit_after_fork() failed\n"));
433 smb_panic("reinit_after_fork() failed");
434 }
435
436 smbd_setup_sig_term_handler();
437 smbd_setup_sig_hup_handler();
438
439 smbd_process();
440 exit:
441 exit_server_cleanly("end of child");
442 return;
443 } else if (pid < 0) {
444 DEBUG(0,("smbd_accept_connection: sys_fork() failed: %s\n",
445 strerror(errno)));
446 }
447
448 /* The parent doesn't need this socket */
449 close(smbd_server_fd());
450
451 /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
452 Clear the closed fd info out of server_fd --
453 and more importantly, out of client_fd in
454 util_sock.c, to avoid a possible
455 getpeername failure if we reopen the logs
456 and use %I in the filename.
457 */
458
459 smbd_set_server_fd(-1);
460
461 if (pid != 0) {
462 add_child_pid(pid);
463 }
464
465 /* Force parent to check log size after
466 * spawning child. Fix from
467 * klausr@ITAP.Physik.Uni-Stuttgart.De. The
468 * parent smbd will log to logserver.smb. It
469 * writes only two messages for each child
470 * started/finished. But each child writes,
471 * say, 50 messages also in logserver.smb,
472 * begining with the debug_count of the
473 * parent, before the child opens its own log
474 * file logserver.client. In a worst case
475 * scenario the size of logserver.smb would be
476 * checked after about 50*50=2500 messages
477 * (ca. 100kb).
478 * */
479 force_check_log_size();
480}
481
482static bool smbd_open_one_socket(struct smbd_parent_context *parent,
483 const struct sockaddr_storage *ifss,
484 uint16_t port)
485{
486 struct smbd_open_socket *s;
487
488 s = talloc(parent, struct smbd_open_socket);
489 if (!s) {
490 return false;
491 }
492
493 s->parent = parent;
494 s->fd = open_socket_in(SOCK_STREAM,
495 port,
496 parent->sockets == NULL ? 0 : 2,
497 ifss,
498 true);
499 if (s->fd == -1) {
500 DEBUG(0,("smbd_open_once_socket: open_socket_in: "
501 "%s\n", strerror(errno)));
502 TALLOC_FREE(s);
503 /*
504 * We ignore an error here, as we've done before
505 */
506 return true;
507 }
508
509 /* ready to listen */
510 set_socket_options(s->fd, "SO_KEEPALIVE");
511 set_socket_options(s->fd, lp_socket_options());
512
513 /* Set server socket to
514 * non-blocking for the accept. */
515 set_blocking(s->fd, False);
516
517 if (listen(s->fd, SMBD_LISTEN_BACKLOG) == -1) {
518 DEBUG(0,("open_sockets_smbd: listen: "
519 "%s\n", strerror(errno)));
520 close(s->fd);
521 TALLOC_FREE(s);
522 return false;
523 }
524
525 s->fde = tevent_add_fd(smbd_event_context(),
526 s,
527 s->fd, TEVENT_FD_READ,
528 smbd_accept_connection,
529 s);
530 if (!s->fde) {
531 DEBUG(0,("open_sockets_smbd: "
532 "tevent_add_fd: %s\n",
533 strerror(errno)));
534 close(s->fd);
535 TALLOC_FREE(s);
536 return false;
537 }
538 tevent_fd_set_close_fn(s->fde, smbd_open_socket_close_fn);
539
540 DLIST_ADD_END(parent->sockets, s, struct smbd_open_socket *);
541
542 return true;
543}
544
545static bool parent_housekeeping_fn(const struct timeval *now, void *private_data)
546{
547 DEBUG(5, ("houskeeping\n"));
548 /* check if we need to reload services */
549 check_reload(time(NULL));
550 return true;
551}
552
553/****************************************************************************
554 Open the socket communication.
555****************************************************************************/
556
557static bool open_sockets_smbd(struct smbd_parent_context *parent,
558 const char *smb_ports)
559{
560 int num_interfaces = iface_count();
561 int i;
562 char *ports;
563 char *tok;
564 const char *ptr;
565 unsigned dns_port = 0;
566
567#ifdef HAVE_ATEXIT
568 atexit(killkids);
569#endif
570
571 /* Stop zombies */
572 smbd_setup_sig_chld_handler();
573
574 /* use a reasonable default set of ports - listing on 445 and 139 */
575 if (!smb_ports) {
576 ports = lp_smb_ports();
577 if (!ports || !*ports) {
578 ports = talloc_strdup(talloc_tos(), SMB_PORTS);
579 } else {
580 ports = talloc_strdup(talloc_tos(), ports);
581 }
582 } else {
583 ports = talloc_strdup(talloc_tos(), smb_ports);
584 }
585
586 for (ptr = ports;
587 next_token_talloc(talloc_tos(),&ptr, &tok, " \t,");) {
588 unsigned port = atoi(tok);
589
590 if (port == 0 || port > 0xffff) {
591 exit_server_cleanly("Invalid port in the config or on "
592 "the commandline specified!");
593 }
594 }
595
596 if (lp_interfaces() && lp_bind_interfaces_only()) {
597 /* We have been given an interfaces line, and been
598 told to only bind to those interfaces. Create a
599 socket per interface and bind to only these.
600 */
601
602 /* Now open a listen socket for each of the
603 interfaces. */
604 for(i = 0; i < num_interfaces; i++) {
605 const struct sockaddr_storage *ifss =
606 iface_n_sockaddr_storage(i);
607
608 if (ifss == NULL) {
609 DEBUG(0,("open_sockets_smbd: "
610 "interface %d has NULL IP address !\n",
611 i));
612 continue;
613 }
614
615 for (ptr=ports;
616 next_token_talloc(talloc_tos(),&ptr, &tok, " \t,");) {
617 unsigned port = atoi(tok);
618
619 /* Keep the first port for mDNS service
620 * registration.
621 */
622 if (dns_port == 0) {
623 dns_port = port;
624 }
625
626 if (!smbd_open_one_socket(parent, ifss, port)) {
627 return false;
628 }
629 }
630 }
631 } else {
632 /* Just bind to 0.0.0.0 - accept connections
633 from anywhere. */
634
635 const char *sock_addr = lp_socket_address();
636 char *sock_tok;
637 const char *sock_ptr;
638
639 if (strequal(sock_addr, "0.0.0.0") ||
640 strequal(sock_addr, "::")) {
641#if HAVE_IPV6
642 sock_addr = "::,0.0.0.0";
643#else
644 sock_addr = "0.0.0.0";
645#endif
646 }
647
648 for (sock_ptr=sock_addr;
649 next_token_talloc(talloc_tos(), &sock_ptr, &sock_tok, " \t,"); ) {
650 for (ptr=ports; next_token_talloc(talloc_tos(), &ptr, &tok, " \t,"); ) {
651 struct sockaddr_storage ss;
652 unsigned port = atoi(tok);
653
654 /* Keep the first port for mDNS service
655 * registration.
656 */
657 if (dns_port == 0) {
658 dns_port = port;
659 }
660
661 /* open an incoming socket */
662 if (!interpret_string_addr(&ss, sock_tok,
663 AI_NUMERICHOST|AI_PASSIVE)) {
664 continue;
665 }
666
667 if (!smbd_open_one_socket(parent, &ss, port)) {
668 return false;
669 }
670 }
671 }
672 }
673
674 if (parent->sockets == NULL) {
675 DEBUG(0,("open_sockets_smbd: No "
676 "sockets available to bind to.\n"));
677 return false;
678 }
679
680 /* Setup the main smbd so that we can get messages. Note that
681 do this after starting listening. This is needed as when in
682 clustered mode, ctdb won't allow us to start doing database
683 operations until it has gone thru a full startup, which
684 includes checking to see that smbd is listening. */
685 claim_connection(NULL,"",
686 FLAG_MSG_GENERAL|FLAG_MSG_SMBD|FLAG_MSG_DBWRAP);
687
688 if (!(event_add_idle(smbd_event_context(), NULL,
689 timeval_set(SMBD_HOUSEKEEPING_INTERVAL, 0),
690 "parent_housekeeping", parent_housekeeping_fn,
691 parent))) {
692 DEBUG(0, ("Could not add housekeeping event\n"));
693 exit(1);
694 }
695
696 /* Listen to messages */
697
698 messaging_register(smbd_messaging_context(), NULL,
699 MSG_SMB_SAM_SYNC, msg_sam_sync);
700 messaging_register(smbd_messaging_context(), NULL,
701 MSG_SHUTDOWN, msg_exit_server);
702 messaging_register(smbd_messaging_context(), NULL,
703 MSG_SMB_FILE_RENAME, msg_file_was_renamed);
704 messaging_register(smbd_messaging_context(), NULL,
705 MSG_SMB_CONF_UPDATED, smb_conf_updated);
706 messaging_register(smbd_messaging_context(), NULL,
707 MSG_SMB_STAT_CACHE_DELETE, smb_stat_cache_delete);
708 messaging_register(smbd_messaging_context(), NULL,
709 MSG_DEBUG, smbd_msg_debug);
710 brl_register_msgs(smbd_messaging_context());
711
712#ifdef CLUSTER_SUPPORT
713 if (lp_clustering()) {
714 ctdbd_register_reconfigure(messaging_ctdbd_connection());
715 }
716#endif
717
718#ifdef DEVELOPER
719 messaging_register(smbd_messaging_context(), NULL,
720 MSG_SMB_INJECT_FAULT, msg_inject_fault);
721#endif
722
723 if (dns_port != 0) {
724#ifdef WITH_DNSSD_SUPPORT
725 smbd_setup_mdns_registration(smbd_event_context(),
726 parent, dns_port);
727#endif
728#ifdef WITH_AVAHI_SUPPORT
729 void *avahi_conn;
730
731 avahi_conn = avahi_start_register(
732 smbd_event_context(), smbd_event_context(), dns_port);
733 if (avahi_conn == NULL) {
734 DEBUG(10, ("avahi_start_register failed\n"));
735 }
736#endif
737 }
738
739 return true;
740}
741
742static void smbd_parent_loop(struct smbd_parent_context *parent)
743{
744 /* now accept incoming connections - forking a new process
745 for each incoming connection */
746 DEBUG(2,("waiting for connections\n"));
747 while (1) {
748 int ret;
749 TALLOC_CTX *frame = talloc_stackframe();
750 ret = tevent_loop_once(smbd_event_context());
751 if (ret != 0) {
752 exit_server_cleanly("tevent_loop_once() error");
753 }
754
755 TALLOC_FREE(frame);
756 } /* end while 1 */
757
758/* NOTREACHED return True; */
759}
760
761/***************************************************************************
762 purge stale printers and reload from pre-populated pcap cache
763***************************************************************************/
764void reload_printers(void)
765{
766 int snum;
767 int n_services = lp_numservices();
768 int pnum = lp_servicenumber(PRINTERS_NAME);
769 const char *pname;
770
771 DEBUG(10, ("reloading printer services from pcap cache\n"));
772 for (snum = 0; snum < n_services; snum++) {
773 /* avoid removing PRINTERS_NAME or non-autoloaded printers */
774 if (snum == pnum || !(lp_snum_ok(snum) && lp_print_ok(snum) &&
775 lp_autoloaded(snum)))
776 continue;
777
778 pname = lp_printername(snum);
779 if (!pcap_printername_ok(pname)) {
780 DEBUG(3, ("removing stale printer %s\n", pname));
781
782 if (is_printer_published(NULL, snum, NULL))
783 nt_printer_publish(NULL, snum, DSPRINT_UNPUBLISH);
784 del_a_printer(pname);
785 lp_killservice(snum);
786 }
787 }
788
789 load_printers();
790}
791
792/****************************************************************************
793 Reload the services file.
794**************************************************************************/
795
796bool reload_services(bool test)
797{
798 bool ret;
799
800 if (lp_loaded()) {
801 char *fname = lp_configfile();
802 if (file_exist(fname) &&
803 !strcsequal(fname, get_dyn_CONFIGFILE())) {
804 set_dyn_CONFIGFILE(fname);
805 test = False;
806 }
807 TALLOC_FREE(fname);
808 }
809
810 reopen_logs();
811
812 if (test && !lp_file_list_changed())
813 return(True);
814
815 lp_killunused(conn_snum_used);
816
817 ret = lp_load(get_dyn_CONFIGFILE(), False, False, True, True);
818
819 pcap_cache_reload(&reload_printers);
820
821 /* perhaps the config filename is now set */
822 if (!test)
823 reload_services(True);
824
825 reopen_logs();
826
827 load_interfaces();
828
829 if (smbd_server_fd() != -1) {
830 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
831 set_socket_options(smbd_server_fd(), lp_socket_options());
832 }
833
834 mangle_reset_cache();
835 reset_stat_cache();
836
837 /* this forces service parameters to be flushed */
838 set_current_service(NULL,0,True);
839
840 return(ret);
841}
842
843/****************************************************************************
844 Exit the server.
845****************************************************************************/
846
847/* Reasons for shutting down a server process. */
848enum server_exit_reason { SERVER_EXIT_NORMAL, SERVER_EXIT_ABNORMAL };
849
850static void exit_server_common(enum server_exit_reason how,
851 const char *const reason) _NORETURN_;
852
853static void exit_server_common(enum server_exit_reason how,
854 const char *const reason)
855{
856 bool had_open_conn = false;
857 struct smbd_server_connection *sconn = smbd_server_conn;
858
859 if (!exit_firsttime)
860 exit(0);
861 exit_firsttime = false;
862
863 change_to_root_user();
864
865 if (sconn && sconn->smb1.negprot.auth_context) {
866 struct auth_context *a = sconn->smb1.negprot.auth_context;
867 a->free(&sconn->smb1.negprot.auth_context);
868 }
869
870 if (sconn) {
871 had_open_conn = conn_close_all(sconn);
872 invalidate_all_vuids(sconn);
873 }
874
875 /* 3 second timeout. */
876 print_notify_send_messages(smbd_messaging_context(), 3);
877
878 /* delete our entry in the connections database. */
879 yield_connection(NULL,"");
880
881#ifdef WITH_DFS
882 if (dcelogin_atmost_once) {
883 dfs_unlogin();
884 }
885#endif
886
887#ifdef USE_DMAPI
888 /* Destroy Samba DMAPI session only if we are master smbd process */
889 if (am_parent) {
890 if (!dmapi_destroy_session()) {
891 DEBUG(0,("Unable to close Samba DMAPI session\n"));
892 }
893 }
894#endif
895
896 locking_end();
897 printing_end();
898
899 /*
900 * we need to force the order of freeing the following,
901 * because smbd_msg_ctx is not a talloc child of smbd_server_conn.
902 */
903 sconn = NULL;
904 TALLOC_FREE(smbd_server_conn);
905 TALLOC_FREE(smbd_msg_ctx);
906 TALLOC_FREE(smbd_event_ctx);
907
908 if (how != SERVER_EXIT_NORMAL) {
909 int oldlevel = DEBUGLEVEL;
910
911 DEBUGLEVEL = 10;
912
913 DEBUGSEP(0);
914 DEBUG(0,("Abnormal server exit: %s\n",
915 reason ? reason : "no explanation provided"));
916 DEBUGSEP(0);
917
918 log_stack_trace();
919
920 DEBUGLEVEL = oldlevel;
921 dump_core();
922
923 } else {
924 DEBUG(3,("Server exit (%s)\n",
925 (reason ? reason : "normal exit")));
926 if (am_parent) {
927 pidfile_unlink();
928 }
929 gencache_stabilize();
930 }
931
932 /* if we had any open SMB connections when we exited then we
933 need to tell the parent smbd so that it can trigger a retry
934 of any locks we may have been holding or open files we were
935 blocking */
936 if (had_open_conn) {
937 exit(1);
938 } else {
939 exit(0);
940 }
941}
942
943void exit_server(const char *const explanation)
944{
945 exit_server_common(SERVER_EXIT_ABNORMAL, explanation);
946}
947
948void exit_server_cleanly(const char *const explanation)
949{
950 exit_server_common(SERVER_EXIT_NORMAL, explanation);
951}
952
953void exit_server_fault(void)
954{
955 exit_server("critical server fault");
956}
957
958/****************************************************************************
959 Initialise connect, service and file structs.
960****************************************************************************/
961
962static bool init_structs(void )
963{
964 /*
965 * Set the machine NETBIOS name if not already
966 * set from the config file.
967 */
968
969 if (!init_names())
970 return False;
971
972 file_init();
973
974 if (!secrets_init())
975 return False;
976
977 return True;
978}
979
980/****************************************************************************
981 main program.
982****************************************************************************/
983
984/* Declare prototype for build_options() to avoid having to run it through
985 mkproto.h. Mixing $(builddir) and $(srcdir) source files in the current
986 prototype generation system is too complicated. */
987
988extern void build_options(bool screen);
989
990 int main(int argc,const char *argv[])
991{
992 /* shall I run as a daemon */
993 bool is_daemon = false;
994 bool interactive = false;
995 bool Fork = true;
996 bool no_process_group = false;
997 bool log_stdout = false;
998 char *ports = NULL;
999 char *profile_level = NULL;
1000 int opt;
1001 poptContext pc;
1002 bool print_build_options = False;
1003 enum {
1004 OPT_DAEMON = 1000,
1005 OPT_INTERACTIVE,
1006 OPT_FORK,
1007 OPT_NO_PROCESS_GROUP,
1008 OPT_LOG_STDOUT
1009 };
1010 struct poptOption long_options[] = {
1011 POPT_AUTOHELP
1012 {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1013 {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)"},
1014 {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools, etc.)" },
1015 {"no-process-group", '\0', POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1016 {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1017 {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
1018 {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
1019 {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
1020 POPT_COMMON_SAMBA
1021 POPT_COMMON_DYNCONFIG
1022 POPT_TABLEEND
1023 };
1024 struct smbd_parent_context *parent = NULL;
1025 TALLOC_CTX *frame = talloc_stackframe(); /* Setup tos. */
1026
1027 smbd_init_globals();
1028
1029 TimeInit();
1030
1031#ifdef HAVE_SET_AUTH_PARAMETERS
1032 set_auth_parameters(argc,argv);
1033#endif
1034
1035 pc = poptGetContext("smbd", argc, argv, long_options, 0);
1036 while((opt = poptGetNextOpt(pc)) != -1) {
1037 switch (opt) {
1038 case OPT_DAEMON:
1039 is_daemon = true;
1040 break;
1041 case OPT_INTERACTIVE:
1042 interactive = true;
1043 break;
1044 case OPT_FORK:
1045 Fork = false;
1046 break;
1047 case OPT_NO_PROCESS_GROUP:
1048 no_process_group = true;
1049 break;
1050 case OPT_LOG_STDOUT:
1051 log_stdout = true;
1052 break;
1053 case 'b':
1054 print_build_options = True;
1055 break;
1056 default:
1057 d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1058 poptBadOption(pc, 0), poptStrerror(opt));
1059 poptPrintUsage(pc, stderr, 0);
1060 exit(1);
1061 }
1062 }
1063 poptFreeContext(pc);
1064
1065 if (interactive) {
1066 Fork = False;
1067 log_stdout = True;
1068 }
1069
1070 setup_logging(argv[0],log_stdout);
1071
1072 if (print_build_options) {
1073 build_options(True); /* Display output to screen as well as debug */
1074 exit(0);
1075 }
1076
1077 load_case_tables();
1078
1079#ifdef HAVE_SETLUID
1080 /* needed for SecureWare on SCO */
1081 setluid(0);
1082#endif
1083
1084 sec_init();
1085
1086 set_remote_machine_name("smbd", False);
1087
1088 if (interactive && (DEBUGLEVEL >= 9)) {
1089 talloc_enable_leak_report();
1090 }
1091
1092 if (log_stdout && Fork) {
1093 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
1094 exit(1);
1095 }
1096
1097 /* we want to re-seed early to prevent time delays causing
1098 client problems at a later date. (tridge) */
1099 generate_random_buffer(NULL, 0);
1100
1101 /* make absolutely sure we run as root - to handle cases where people
1102 are crazy enough to have it setuid */
1103
1104 gain_root_privilege();
1105 gain_root_group_privilege();
1106
1107 fault_setup((void (*)(void *))exit_server_fault);
1108 dump_core_setup("smbd");
1109
1110 /* we are never interested in SIGPIPE */
1111 BlockSignals(True,SIGPIPE);
1112
1113#if defined(SIGFPE)
1114 /* we are never interested in SIGFPE */
1115 BlockSignals(True,SIGFPE);
1116#endif
1117
1118#if defined(SIGUSR2)
1119 /* We are no longer interested in USR2 */
1120 BlockSignals(True,SIGUSR2);
1121#endif
1122
1123 /* POSIX demands that signals are inherited. If the invoking process has
1124 * these signals masked, we will have problems, as we won't recieve them. */
1125 BlockSignals(False, SIGHUP);
1126 BlockSignals(False, SIGUSR1);
1127 BlockSignals(False, SIGTERM);
1128
1129 /* Ensure we leave no zombies until we
1130 * correctly set up child handling below. */
1131
1132 CatchChild();
1133
1134 /* we want total control over the permissions on created files,
1135 so set our umask to 0 */
1136 umask(0);
1137
1138 init_sec_ctx();
1139
1140 reopen_logs();
1141
1142#ifdef __OS2__
1143 unsigned long _System DosSetPriority (unsigned long ulScope, unsigned long ulClass, long lDelta, unsigned long ulID);
1144 int rc;
1145 rc = DosSetPriority(
1146 0, /* Scope: only one process */
1147 4, /* set to PRTYC_FOREGROUNDSERVER */
1148 0, /* set delta - was 0 */
1149 0); /* Assume current process */
1150 DEBUG(0,( "Server priority set to PRTYC_FOREGROUNDSERVER\n"));
1151#endif
1152
1153 DEBUG(0,("smbd version %s started.\n", samba_version_string()));
1154 DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1155
1156 DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
1157 (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
1158
1159 /* Output the build options to the debug log */
1160 build_options(False);
1161
1162 if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
1163 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
1164 exit(1);
1165 }
1166
1167 if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1168 DEBUG(0, ("error opening config file\n"));
1169 exit(1);
1170 }
1171
1172 if (smbd_messaging_context() == NULL)
1173 exit(1);
1174
1175 if (!reload_services(False))
1176 return(-1);
1177
1178 init_structs();
1179
1180#ifdef WITH_PROFILE
1181 if (!profile_setup(smbd_messaging_context(), False)) {
1182 DEBUG(0,("ERROR: failed to setup profiling\n"));
1183 return -1;
1184 }
1185 if (profile_level != NULL) {
1186 int pl = atoi(profile_level);
1187 struct server_id src;
1188
1189 DEBUG(1, ("setting profiling level: %s\n",profile_level));
1190 src.pid = getpid();
1191 set_profile_level(pl, src);
1192 }
1193#endif
1194
1195 DEBUG(3,( "loaded services\n"));
1196
1197 if (!is_daemon && !is_a_socket(0)) {
1198 if (!interactive)
1199 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
1200
1201 /*
1202 * Setting is_daemon here prevents us from eventually calling
1203 * the open_sockets_inetd()
1204 */
1205
1206 is_daemon = True;
1207 }
1208
1209 if (is_daemon && !interactive) {
1210 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1211 become_daemon(Fork, no_process_group);
1212 }
1213
1214#if HAVE_SETPGID
1215 /*
1216 * If we're interactive we want to set our own process group for
1217 * signal management.
1218 */
1219 if (interactive && !no_process_group)
1220 setpgid( (pid_t)0, (pid_t)0);
1221#endif
1222
1223 if (!directory_exist(lp_lockdir()))
1224 mkdir(lp_lockdir(), 0755);
1225
1226 if (is_daemon)
1227 pidfile_create("smbd");
1228
1229 if (!NT_STATUS_IS_OK(reinit_after_fork(smbd_messaging_context(),
1230 smbd_event_context(), false))) {
1231 DEBUG(0,("reinit_after_fork() failed\n"));
1232 exit(1);
1233 }
1234
1235 smbd_setup_sig_term_handler();
1236 smbd_setup_sig_hup_handler();
1237
1238 /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1239
1240 if (smbd_memcache() == NULL) {
1241 exit(1);
1242 }
1243
1244 memcache_set_global(smbd_memcache());
1245
1246 /* Initialise the password backed before the global_sam_sid
1247 to ensure that we fetch from ldap before we make a domain sid up */
1248
1249 if(!initialize_password_db(False, smbd_event_context()))
1250 exit(1);
1251
1252 if (!secrets_init()) {
1253 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1254 exit(1);
1255 }
1256
1257 if(!get_global_sam_sid()) {
1258 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1259 exit(1);
1260 }
1261
1262 if (!session_init())
1263 exit(1);
1264
1265 if (!connections_init(True))
1266 exit(1);
1267
1268 if (!locking_init())
1269 exit(1);
1270
1271 namecache_enable();
1272
1273 if (!W_ERROR_IS_OK(registry_init_full()))
1274 exit(1);
1275
1276#if 0
1277 if (!init_svcctl_db())
1278 exit(1);
1279#endif
1280
1281 if (!print_backend_init(smbd_messaging_context()))
1282 exit(1);
1283
1284 if (!init_guest_info()) {
1285 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1286 return -1;
1287 }
1288
1289 /* Open the share_info.tdb here, so we don't have to open
1290 after the fork on every single connection. This is a small
1291 performance improvment and reduces the total number of system
1292 fds used. */
1293 if (!share_info_db_init()) {
1294 DEBUG(0,("ERROR: failed to load share info db.\n"));
1295 exit(1);
1296 }
1297
1298 /* only start the background queue daemon if we are
1299 running as a daemon -- bad things will happen if
1300 smbd is launched via inetd and we fork a copy of
1301 ourselves here */
1302
1303 if (is_daemon && !interactive
1304 && lp_parm_bool(-1, "smbd", "backgroundqueue", true)) {
1305 start_background_queue();
1306 }
1307
1308 if (!is_daemon) {
1309 /* inetd mode */
1310 TALLOC_FREE(frame);
1311
1312 /* Started from inetd. fd 0 is the socket. */
1313 /* We will abort gracefully when the client or remote system
1314 goes away */
1315 smbd_set_server_fd(dup(0));
1316
1317 /* close our standard file descriptors */
1318 close_low_fds(False); /* Don't close stderr */
1319
1320#ifdef HAVE_ATEXIT
1321 atexit(killkids);
1322#endif
1323
1324 /* Stop zombies */
1325 smbd_setup_sig_chld_handler();
1326
1327 smbd_process();
1328
1329 exit_server_cleanly(NULL);
1330 return(0);
1331 }
1332
1333 parent = talloc_zero(smbd_event_context(), struct smbd_parent_context);
1334 if (!parent) {
1335 exit_server("talloc(struct smbd_parent_context) failed");
1336 }
1337 parent->interactive = interactive;
1338
1339 if (!open_sockets_smbd(parent, ports))
1340 exit_server("open_sockets_smbd() failed");
1341
1342 TALLOC_FREE(frame);
1343 /* make sure we always have a valid stackframe */
1344 frame = talloc_stackframe();
1345
1346 smbd_parent_loop(parent);
1347
1348 exit_server_cleanly(NULL);
1349 TALLOC_FREE(frame);
1350 return(0);
1351}
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