source: vendor/3.5.4/source3/smbd/server.c

Last change on this file was 427, checked in by Silvan Scherrer, 16 years ago

Samba 3.5.x: update to 3.5.2
File size: 33.0 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 DEBUG(0, ("Could not find child %d -- ignoring\n", (int)pid));
282}
283
284/****************************************************************************
285 Have we reached the process limit ?
286****************************************************************************/
287
288static bool allowable_number_of_smbd_processes(void)
289{
290 int max_processes = lp_max_smbd_processes();
291
292 if (!max_processes)
293 return True;
294
295 return num_children < max_processes;
296}
297
298static void smbd_sig_chld_handler(struct tevent_context *ev,
299 struct tevent_signal *se,
300 int signum,
301 int count,
302 void *siginfo,
303 void *private_data)
304{
305 pid_t pid;
306 int status;
307
308 while ((pid = sys_waitpid(-1, &status, WNOHANG)) > 0) {
309 bool unclean_shutdown = False;
310
311 /* If the child terminated normally, assume
312 it was an unclean shutdown unless the
313 status is 0
314 */
315 if (WIFEXITED(status)) {
316 unclean_shutdown = WEXITSTATUS(status);
317 }
318 /* If the child terminated due to a signal
319 we always assume it was unclean.
320 */
321 if (WIFSIGNALED(status)) {
322 unclean_shutdown = True;
323 }
324 remove_child_pid(pid, unclean_shutdown);
325 }
326}
327
328static void smbd_setup_sig_chld_handler(void)
329{
330 struct tevent_signal *se;
331
332 se = tevent_add_signal(smbd_event_context(),
333 smbd_event_context(),
334 SIGCHLD, 0,
335 smbd_sig_chld_handler,
336 NULL);
337 if (!se) {
338 exit_server("failed to setup SIGCHLD handler");
339 }
340}
341
342struct smbd_open_socket;
343
344struct smbd_parent_context {
345 bool interactive;
346
347 /* the list of listening sockets */
348 struct smbd_open_socket *sockets;
349};
350
351struct smbd_open_socket {
352 struct smbd_open_socket *prev, *next;
353 struct smbd_parent_context *parent;
354 int fd;
355 struct tevent_fd *fde;
356};
357
358static void smbd_open_socket_close_fn(struct tevent_context *ev,
359 struct tevent_fd *fde,
360 int fd,
361 void *private_data)
362{
363 /* this might be the socket_wrapper swrap_close() */
364 close(fd);
365}
366
367static void smbd_accept_connection(struct tevent_context *ev,
368 struct tevent_fd *fde,
369 uint16_t flags,
370 void *private_data)
371{
372 struct smbd_open_socket *s = talloc_get_type_abort(private_data,
373 struct smbd_open_socket);
374 struct sockaddr_storage addr;
375 socklen_t in_addrlen = sizeof(addr);
376 pid_t pid = 0;
377
378 smbd_set_server_fd(accept(s->fd,(struct sockaddr *)&addr,&in_addrlen));
379
380 if (smbd_server_fd() == -1 && errno == EINTR)
381 return;
382
383 if (smbd_server_fd() == -1) {
384 DEBUG(0,("open_sockets_smbd: accept: %s\n",
385 strerror(errno)));
386 return;
387 }
388
389 if (s->parent->interactive) {
390 smbd_process();
391 exit_server_cleanly("end of interactive mode");
392 return;
393 }
394
395 if (!allowable_number_of_smbd_processes()) {
396 close(smbd_server_fd());
397 smbd_set_server_fd(-1);
398 return;
399 }
400
401 pid = sys_fork();
402 if (pid == 0) {
403 NTSTATUS status = NT_STATUS_OK;
404 /* Child code ... */
405 am_parent = 0;
406
407 /* Stop zombies, the parent explicitly handles
408 * them, counting worker smbds. */
409 CatchChild();
410
411 /* close our standard file
412 descriptors */
413 close_low_fds(False);
414
415 /*
416 * Can't use TALLOC_FREE here. Nulling out the argument to it
417 * would overwrite memory we've just freed.
418 */
419 talloc_free(s->parent);
420 s = NULL;
421
422 status = reinit_after_fork(smbd_messaging_context(),
423 smbd_event_context(), true);
424 if (!NT_STATUS_IS_OK(status)) {
425 if (NT_STATUS_EQUAL(status,
426 NT_STATUS_TOO_MANY_OPENED_FILES)) {
427 DEBUG(0,("child process cannot initialize "
428 "because too many files are open\n"));
429 goto exit;
430 }
431 DEBUG(0,("reinit_after_fork() failed\n"));
432 smb_panic("reinit_after_fork() failed");
433 }
434
435 smbd_setup_sig_term_handler();
436 smbd_setup_sig_hup_handler();
437
438 smbd_process();
439 exit:
440 exit_server_cleanly("end of child");
441 return;
442 } else if (pid < 0) {
443 DEBUG(0,("smbd_accept_connection: sys_fork() failed: %s\n",
444 strerror(errno)));
445 }
446
447 /* The parent doesn't need this socket */
448 close(smbd_server_fd());
449
450 /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
451 Clear the closed fd info out of server_fd --
452 and more importantly, out of client_fd in
453 util_sock.c, to avoid a possible
454 getpeername failure if we reopen the logs
455 and use %I in the filename.
456 */
457
458 smbd_set_server_fd(-1);
459
460 if (pid != 0) {
461 add_child_pid(pid);
462 }
463
464 /* Force parent to check log size after
465 * spawning child. Fix from
466 * klausr@ITAP.Physik.Uni-Stuttgart.De. The
467 * parent smbd will log to logserver.smb. It
468 * writes only two messages for each child
469 * started/finished. But each child writes,
470 * say, 50 messages also in logserver.smb,
471 * begining with the debug_count of the
472 * parent, before the child opens its own log
473 * file logserver.client. In a worst case
474 * scenario the size of logserver.smb would be
475 * checked after about 50*50=2500 messages
476 * (ca. 100kb).
477 * */
478 force_check_log_size();
479}
480
481static bool smbd_open_one_socket(struct smbd_parent_context *parent,
482 const struct sockaddr_storage *ifss,
483 uint16_t port)
484{
485 struct smbd_open_socket *s;
486
487 s = talloc(parent, struct smbd_open_socket);
488 if (!s) {
489 return false;
490 }
491
492 s->parent = parent;
493 s->fd = open_socket_in(SOCK_STREAM,
494 port,
495 parent->sockets == NULL ? 0 : 2,
496 ifss,
497 true);
498 if (s->fd == -1) {
499 DEBUG(0,("smbd_open_once_socket: open_socket_in: "
500 "%s\n", strerror(errno)));
501 TALLOC_FREE(s);
502 /*
503 * We ignore an error here, as we've done before
504 */
505 return true;
506 }
507
508 /* ready to listen */
509 set_socket_options(s->fd, "SO_KEEPALIVE");
510 set_socket_options(s->fd, lp_socket_options());
511
512 /* Set server socket to
513 * non-blocking for the accept. */
514 set_blocking(s->fd, False);
515
516 if (listen(s->fd, SMBD_LISTEN_BACKLOG) == -1) {
517 DEBUG(0,("open_sockets_smbd: listen: "
518 "%s\n", strerror(errno)));
519 close(s->fd);
520 TALLOC_FREE(s);
521 return false;
522 }
523
524 s->fde = tevent_add_fd(smbd_event_context(),
525 s,
526 s->fd, TEVENT_FD_READ,
527 smbd_accept_connection,
528 s);
529 if (!s->fde) {
530 DEBUG(0,("open_sockets_smbd: "
531 "tevent_add_fd: %s\n",
532 strerror(errno)));
533 close(s->fd);
534 TALLOC_FREE(s);
535 return false;
536 }
537 tevent_fd_set_close_fn(s->fde, smbd_open_socket_close_fn);
538
539 DLIST_ADD_END(parent->sockets, s, struct smbd_open_socket *);
540
541 return true;
542}
543
544/****************************************************************************
545 Open the socket communication.
546****************************************************************************/
547
548static bool open_sockets_smbd(struct smbd_parent_context *parent,
549 const char *smb_ports)
550{
551 int num_interfaces = iface_count();
552 int i;
553 char *ports;
554 unsigned dns_port = 0;
555
556#ifdef HAVE_ATEXIT
557 atexit(killkids);
558#endif
559
560 /* Stop zombies */
561 smbd_setup_sig_chld_handler();
562
563 /* use a reasonable default set of ports - listing on 445 and 139 */
564 if (!smb_ports) {
565 ports = lp_smb_ports();
566 if (!ports || !*ports) {
567 ports = talloc_strdup(talloc_tos(), SMB_PORTS);
568 } else {
569 ports = talloc_strdup(talloc_tos(), ports);
570 }
571 } else {
572 ports = talloc_strdup(talloc_tos(), smb_ports);
573 }
574
575 if (lp_interfaces() && lp_bind_interfaces_only()) {
576 /* We have been given an interfaces line, and been
577 told to only bind to those interfaces. Create a
578 socket per interface and bind to only these.
579 */
580
581 /* Now open a listen socket for each of the
582 interfaces. */
583 for(i = 0; i < num_interfaces; i++) {
584 const struct sockaddr_storage *ifss =
585 iface_n_sockaddr_storage(i);
586 char *tok;
587 const char *ptr;
588
589 if (ifss == NULL) {
590 DEBUG(0,("open_sockets_smbd: "
591 "interface %d has NULL IP address !\n",
592 i));
593 continue;
594 }
595
596 for (ptr=ports;
597 next_token_talloc(talloc_tos(),&ptr, &tok, " \t,");) {
598 unsigned port = atoi(tok);
599 if (port == 0 || port > 0xffff) {
600 continue;
601 }
602
603 if (!smbd_open_one_socket(parent, ifss, port)) {
604 return false;
605 }
606 }
607 }
608 } else {
609 /* Just bind to 0.0.0.0 - accept connections
610 from anywhere. */
611
612 char *tok;
613 const char *ptr;
614 const char *sock_addr = lp_socket_address();
615 char *sock_tok;
616 const char *sock_ptr;
617
618 if (strequal(sock_addr, "0.0.0.0") ||
619 strequal(sock_addr, "::")) {
620#if HAVE_IPV6
621 sock_addr = "::,0.0.0.0";
622#else
623 sock_addr = "0.0.0.0";
624#endif
625 }
626
627 for (sock_ptr=sock_addr;
628 next_token_talloc(talloc_tos(), &sock_ptr, &sock_tok, " \t,"); ) {
629 for (ptr=ports; next_token_talloc(talloc_tos(), &ptr, &tok, " \t,"); ) {
630 struct sockaddr_storage ss;
631
632 unsigned port = atoi(tok);
633 if (port == 0 || port > 0xffff) {
634 continue;
635 }
636
637 /* Keep the first port for mDNS service
638 * registration.
639 */
640 if (dns_port == 0) {
641 dns_port = port;
642 }
643
644 /* open an incoming socket */
645 if (!interpret_string_addr(&ss, sock_tok,
646 AI_NUMERICHOST|AI_PASSIVE)) {
647 continue;
648 }
649
650 if (!smbd_open_one_socket(parent, &ss, port)) {
651 return false;
652 }
653 }
654 }
655 }
656
657 if (parent->sockets == NULL) {
658 DEBUG(0,("open_sockets_smbd: No "
659 "sockets available to bind to.\n"));
660 return false;
661 }
662
663 /* Setup the main smbd so that we can get messages. Note that
664 do this after starting listening. This is needed as when in
665 clustered mode, ctdb won't allow us to start doing database
666 operations until it has gone thru a full startup, which
667 includes checking to see that smbd is listening. */
668 claim_connection(NULL,"",
669 FLAG_MSG_GENERAL|FLAG_MSG_SMBD|FLAG_MSG_DBWRAP);
670
671 /* Listen to messages */
672
673 messaging_register(smbd_messaging_context(), NULL,
674 MSG_SMB_SAM_SYNC, msg_sam_sync);
675 messaging_register(smbd_messaging_context(), NULL,
676 MSG_SHUTDOWN, msg_exit_server);
677 messaging_register(smbd_messaging_context(), NULL,
678 MSG_SMB_FILE_RENAME, msg_file_was_renamed);
679 messaging_register(smbd_messaging_context(), NULL,
680 MSG_SMB_CONF_UPDATED, smb_conf_updated);
681 messaging_register(smbd_messaging_context(), NULL,
682 MSG_SMB_STAT_CACHE_DELETE, smb_stat_cache_delete);
683 messaging_register(smbd_messaging_context(), NULL,
684 MSG_DEBUG, smbd_msg_debug);
685 brl_register_msgs(smbd_messaging_context());
686
687#ifdef CLUSTER_SUPPORT
688 if (lp_clustering()) {
689 ctdbd_register_reconfigure(messaging_ctdbd_connection());
690 }
691#endif
692
693#ifdef DEVELOPER
694 messaging_register(smbd_messaging_context(), NULL,
695 MSG_SMB_INJECT_FAULT, msg_inject_fault);
696#endif
697
698 if (dns_port != 0) {
699#ifdef WITH_DNSSD_SUPPORT
700 smbd_setup_mdns_registration(smbd_event_context(),
701 parent, dns_port);
702#endif
703#ifdef WITH_AVAHI_SUPPORT
704 void *avahi_conn;
705
706 avahi_conn = avahi_start_register(
707 smbd_event_context(), smbd_event_context(), dns_port);
708 if (avahi_conn == NULL) {
709 DEBUG(10, ("avahi_start_register failed\n"));
710 }
711#endif
712 }
713
714 return true;
715}
716
717static void smbd_parent_loop(struct smbd_parent_context *parent)
718{
719 /* now accept incoming connections - forking a new process
720 for each incoming connection */
721 DEBUG(2,("waiting for connections\n"));
722 while (1) {
723 int ret;
724 TALLOC_CTX *frame = talloc_stackframe();
725
726 ret = tevent_loop_once(smbd_event_context());
727 if (ret != 0) {
728 exit_server_cleanly("tevent_loop_once() error");
729 }
730
731 TALLOC_FREE(frame);
732 } /* end while 1 */
733
734/* NOTREACHED return True; */
735}
736
737/****************************************************************************
738 Reload printers
739**************************************************************************/
740void reload_printers(void)
741{
742 int snum;
743 int n_services = lp_numservices();
744 int pnum = lp_servicenumber(PRINTERS_NAME);
745 const char *pname;
746
747 pcap_cache_reload();
748
749 /* remove stale printers */
750 for (snum = 0; snum < n_services; snum++) {
751 /* avoid removing PRINTERS_NAME or non-autoloaded printers */
752 if (snum == pnum || !(lp_snum_ok(snum) && lp_print_ok(snum) &&
753 lp_autoloaded(snum)))
754 continue;
755
756 pname = lp_printername(snum);
757 if (!pcap_printername_ok(pname)) {
758 DEBUG(3, ("removing stale printer %s\n", pname));
759
760 if (is_printer_published(NULL, snum, NULL))
761 nt_printer_publish(NULL, snum, DSPRINT_UNPUBLISH);
762 del_a_printer(pname);
763 lp_killservice(snum);
764 }
765 }
766
767 load_printers();
768}
769
770/****************************************************************************
771 Reload the services file.
772**************************************************************************/
773
774bool reload_services(bool test)
775{
776 bool ret;
777
778 if (lp_loaded()) {
779 char *fname = lp_configfile();
780 if (file_exist(fname) &&
781 !strcsequal(fname, get_dyn_CONFIGFILE())) {
782 set_dyn_CONFIGFILE(fname);
783 test = False;
784 }
785 }
786
787 reopen_logs();
788
789 if (test && !lp_file_list_changed())
790 return(True);
791
792 lp_killunused(conn_snum_used);
793
794 ret = lp_load(get_dyn_CONFIGFILE(), False, False, True, True);
795
796 reload_printers();
797
798 /* perhaps the config filename is now set */
799 if (!test)
800 reload_services(True);
801
802 reopen_logs();
803
804 load_interfaces();
805
806 if (smbd_server_fd() != -1) {
807 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
808 set_socket_options(smbd_server_fd(), lp_socket_options());
809 }
810
811 mangle_reset_cache();
812 reset_stat_cache();
813
814 /* this forces service parameters to be flushed */
815 set_current_service(NULL,0,True);
816
817 return(ret);
818}
819
820/****************************************************************************
821 Exit the server.
822****************************************************************************/
823
824/* Reasons for shutting down a server process. */
825enum server_exit_reason { SERVER_EXIT_NORMAL, SERVER_EXIT_ABNORMAL };
826
827static void exit_server_common(enum server_exit_reason how,
828 const char *const reason) _NORETURN_;
829
830static void exit_server_common(enum server_exit_reason how,
831 const char *const reason)
832{
833 bool had_open_conn = false;
834 struct smbd_server_connection *sconn = smbd_server_conn;
835
836 if (!exit_firsttime)
837 exit(0);
838 exit_firsttime = false;
839
840 change_to_root_user();
841
842 if (sconn && sconn->smb1.negprot.auth_context) {
843 struct auth_context *a = sconn->smb1.negprot.auth_context;
844 a->free(&sconn->smb1.negprot.auth_context);
845 }
846
847 if (sconn) {
848 had_open_conn = conn_close_all(sconn);
849 invalidate_all_vuids(sconn);
850 }
851
852 /* 3 second timeout. */
853 print_notify_send_messages(smbd_messaging_context(), 3);
854
855 /* delete our entry in the connections database. */
856 yield_connection(NULL,"");
857
858#ifdef WITH_DFS
859 if (dcelogin_atmost_once) {
860 dfs_unlogin();
861 }
862#endif
863
864#ifdef USE_DMAPI
865 /* Destroy Samba DMAPI session only if we are master smbd process */
866 if (am_parent) {
867 if (!dmapi_destroy_session()) {
868 DEBUG(0,("Unable to close Samba DMAPI session\n"));
869 }
870 }
871#endif
872
873 locking_end();
874 printing_end();
875
876 /*
877 * we need to force the order of freeing the following,
878 * because smbd_msg_ctx is not a talloc child of smbd_server_conn.
879 */
880 sconn = NULL;
881 TALLOC_FREE(smbd_server_conn);
882 TALLOC_FREE(smbd_msg_ctx);
883 TALLOC_FREE(smbd_event_ctx);
884
885 if (how != SERVER_EXIT_NORMAL) {
886 int oldlevel = DEBUGLEVEL;
887
888 DEBUGLEVEL = 10;
889
890 DEBUGSEP(0);
891 DEBUG(0,("Abnormal server exit: %s\n",
892 reason ? reason : "no explanation provided"));
893 DEBUGSEP(0);
894
895 log_stack_trace();
896
897 DEBUGLEVEL = oldlevel;
898 dump_core();
899
900 } else {
901 DEBUG(3,("Server exit (%s)\n",
902 (reason ? reason : "normal exit")));
903 if (am_parent) {
904 pidfile_unlink();
905 }
906 gencache_stabilize();
907 }
908
909 /* if we had any open SMB connections when we exited then we
910 need to tell the parent smbd so that it can trigger a retry
911 of any locks we may have been holding or open files we were
912 blocking */
913 if (had_open_conn) {
914 exit(1);
915 } else {
916 exit(0);
917 }
918}
919
920void exit_server(const char *const explanation)
921{
922 exit_server_common(SERVER_EXIT_ABNORMAL, explanation);
923}
924
925void exit_server_cleanly(const char *const explanation)
926{
927 exit_server_common(SERVER_EXIT_NORMAL, explanation);
928}
929
930void exit_server_fault(void)
931{
932 exit_server("critical server fault");
933}
934
935/****************************************************************************
936 Initialise connect, service and file structs.
937****************************************************************************/
938
939static bool init_structs(void )
940{
941 /*
942 * Set the machine NETBIOS name if not already
943 * set from the config file.
944 */
945
946 if (!init_names())
947 return False;
948
949 file_init();
950
951 if (!secrets_init())
952 return False;
953
954 return True;
955}
956
957/****************************************************************************
958 main program.
959****************************************************************************/
960
961/* Declare prototype for build_options() to avoid having to run it through
962 mkproto.h. Mixing $(builddir) and $(srcdir) source files in the current
963 prototype generation system is too complicated. */
964
965extern void build_options(bool screen);
966
967 int main(int argc,const char *argv[])
968{
969 /* shall I run as a daemon */
970 bool is_daemon = false;
971 bool interactive = false;
972 bool Fork = true;
973 bool no_process_group = false;
974 bool log_stdout = false;
975 char *ports = NULL;
976 char *profile_level = NULL;
977 int opt;
978 poptContext pc;
979 bool print_build_options = False;
980 enum {
981 OPT_DAEMON = 1000,
982 OPT_INTERACTIVE,
983 OPT_FORK,
984 OPT_NO_PROCESS_GROUP,
985 OPT_LOG_STDOUT
986 };
987 struct poptOption long_options[] = {
988 POPT_AUTOHELP
989 {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
990 {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)"},
991 {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools, etc.)" },
992 {"no-process-group", '\0', POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
993 {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
994 {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
995 {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
996 {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
997 POPT_COMMON_SAMBA
998 POPT_COMMON_DYNCONFIG
999 POPT_TABLEEND
1000 };
1001 struct smbd_parent_context *parent = NULL;
1002 TALLOC_CTX *frame = talloc_stackframe(); /* Setup tos. */
1003
1004 smbd_init_globals();
1005
1006 TimeInit();
1007
1008#ifdef HAVE_SET_AUTH_PARAMETERS
1009 set_auth_parameters(argc,argv);
1010#endif
1011
1012 pc = poptGetContext("smbd", argc, argv, long_options, 0);
1013 while((opt = poptGetNextOpt(pc)) != -1) {
1014 switch (opt) {
1015 case OPT_DAEMON:
1016 is_daemon = true;
1017 break;
1018 case OPT_INTERACTIVE:
1019 interactive = true;
1020 break;
1021 case OPT_FORK:
1022 Fork = false;
1023 break;
1024 case OPT_NO_PROCESS_GROUP:
1025 no_process_group = true;
1026 break;
1027 case OPT_LOG_STDOUT:
1028 log_stdout = true;
1029 break;
1030 case 'b':
1031 print_build_options = True;
1032 break;
1033 default:
1034 d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1035 poptBadOption(pc, 0), poptStrerror(opt));
1036 poptPrintUsage(pc, stderr, 0);
1037 exit(1);
1038 }
1039 }
1040 poptFreeContext(pc);
1041
1042 if (interactive) {
1043 Fork = False;
1044 log_stdout = True;
1045 }
1046
1047 setup_logging(argv[0],log_stdout);
1048
1049 if (print_build_options) {
1050 build_options(True); /* Display output to screen as well as debug */
1051 exit(0);
1052 }
1053
1054 load_case_tables();
1055
1056#ifdef HAVE_SETLUID
1057 /* needed for SecureWare on SCO */
1058 setluid(0);
1059#endif
1060
1061 sec_init();
1062
1063 set_remote_machine_name("smbd", False);
1064
1065 if (interactive && (DEBUGLEVEL >= 9)) {
1066 talloc_enable_leak_report();
1067 }
1068
1069 if (log_stdout && Fork) {
1070 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
1071 exit(1);
1072 }
1073
1074 /* we want to re-seed early to prevent time delays causing
1075 client problems at a later date. (tridge) */
1076 generate_random_buffer(NULL, 0);
1077
1078 /* make absolutely sure we run as root - to handle cases where people
1079 are crazy enough to have it setuid */
1080
1081 gain_root_privilege();
1082 gain_root_group_privilege();
1083
1084 fault_setup((void (*)(void *))exit_server_fault);
1085 dump_core_setup("smbd");
1086
1087 /* we are never interested in SIGPIPE */
1088 BlockSignals(True,SIGPIPE);
1089
1090#if defined(SIGFPE)
1091 /* we are never interested in SIGFPE */
1092 BlockSignals(True,SIGFPE);
1093#endif
1094
1095#if defined(SIGUSR2)
1096 /* We are no longer interested in USR2 */
1097 BlockSignals(True,SIGUSR2);
1098#endif
1099
1100 /* POSIX demands that signals are inherited. If the invoking process has
1101 * these signals masked, we will have problems, as we won't recieve them. */
1102 BlockSignals(False, SIGHUP);
1103 BlockSignals(False, SIGUSR1);
1104 BlockSignals(False, SIGTERM);
1105
1106 /* Ensure we leave no zombies until we
1107 * correctly set up child handling below. */
1108
1109 CatchChild();
1110
1111 /* we want total control over the permissions on created files,
1112 so set our umask to 0 */
1113 umask(0);
1114
1115 init_sec_ctx();
1116
1117 reopen_logs();
1118
1119 DEBUG(0,("smbd version %s started.\n", samba_version_string()));
1120 DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1121
1122 DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
1123 (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
1124
1125 /* Output the build options to the debug log */
1126 build_options(False);
1127
1128 if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
1129 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
1130 exit(1);
1131 }
1132
1133 if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1134 DEBUG(0, ("error opening config file\n"));
1135 exit(1);
1136 }
1137
1138 if (smbd_messaging_context() == NULL)
1139 exit(1);
1140
1141 if (!reload_services(False))
1142 return(-1);
1143
1144 init_structs();
1145
1146#ifdef WITH_PROFILE
1147 if (!profile_setup(smbd_messaging_context(), False)) {
1148 DEBUG(0,("ERROR: failed to setup profiling\n"));
1149 return -1;
1150 }
1151 if (profile_level != NULL) {
1152 int pl = atoi(profile_level);
1153 struct server_id src;
1154
1155 DEBUG(1, ("setting profiling level: %s\n",profile_level));
1156 src.pid = getpid();
1157 set_profile_level(pl, src);
1158 }
1159#endif
1160
1161 DEBUG(3,( "loaded services\n"));
1162
1163 if (!is_daemon && !is_a_socket(0)) {
1164 if (!interactive)
1165 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
1166
1167 /*
1168 * Setting is_daemon here prevents us from eventually calling
1169 * the open_sockets_inetd()
1170 */
1171
1172 is_daemon = True;
1173 }
1174
1175 if (is_daemon && !interactive) {
1176 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1177 become_daemon(Fork, no_process_group);
1178 }
1179
1180#if HAVE_SETPGID
1181 /*
1182 * If we're interactive we want to set our own process group for
1183 * signal management.
1184 */
1185 if (interactive && !no_process_group)
1186 setpgid( (pid_t)0, (pid_t)0);
1187#endif
1188
1189 if (!directory_exist(lp_lockdir()))
1190 mkdir(lp_lockdir(), 0755);
1191
1192 if (is_daemon)
1193 pidfile_create("smbd");
1194
1195 if (!NT_STATUS_IS_OK(reinit_after_fork(smbd_messaging_context(),
1196 smbd_event_context(), false))) {
1197 DEBUG(0,("reinit_after_fork() failed\n"));
1198 exit(1);
1199 }
1200
1201 smbd_setup_sig_term_handler();
1202 smbd_setup_sig_hup_handler();
1203
1204 /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1205
1206 if (smbd_memcache() == NULL) {
1207 exit(1);
1208 }
1209
1210 memcache_set_global(smbd_memcache());
1211
1212 /* Initialise the password backed before the global_sam_sid
1213 to ensure that we fetch from ldap before we make a domain sid up */
1214
1215 if(!initialize_password_db(False, smbd_event_context()))
1216 exit(1);
1217
1218 if (!secrets_init()) {
1219 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1220 exit(1);
1221 }
1222
1223 if(!get_global_sam_sid()) {
1224 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1225 exit(1);
1226 }
1227
1228 if (!session_init())
1229 exit(1);
1230
1231 if (!connections_init(True))
1232 exit(1);
1233
1234 if (!locking_init())
1235 exit(1);
1236
1237 namecache_enable();
1238
1239 if (!W_ERROR_IS_OK(registry_init_full()))
1240 exit(1);
1241
1242#if 0
1243 if (!init_svcctl_db())
1244 exit(1);
1245#endif
1246
1247 if (!print_backend_init(smbd_messaging_context()))
1248 exit(1);
1249
1250 if (!init_guest_info()) {
1251 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1252 return -1;
1253 }
1254
1255 /* Open the share_info.tdb here, so we don't have to open
1256 after the fork on every single connection. This is a small
1257 performance improvment and reduces the total number of system
1258 fds used. */
1259 if (!share_info_db_init()) {
1260 DEBUG(0,("ERROR: failed to load share info db.\n"));
1261 exit(1);
1262 }
1263
1264 /* only start the background queue daemon if we are
1265 running as a daemon -- bad things will happen if
1266 smbd is launched via inetd and we fork a copy of
1267 ourselves here */
1268
1269 if (is_daemon && !interactive
1270 && lp_parm_bool(-1, "smbd", "backgroundqueue", true)) {
1271 start_background_queue();
1272 }
1273
1274 if (!is_daemon) {
1275 /* inetd mode */
1276 TALLOC_FREE(frame);
1277
1278 /* Started from inetd. fd 0 is the socket. */
1279 /* We will abort gracefully when the client or remote system
1280 goes away */
1281 smbd_set_server_fd(dup(0));
1282
1283 /* close our standard file descriptors */
1284 close_low_fds(False); /* Don't close stderr */
1285
1286#ifdef HAVE_ATEXIT
1287 atexit(killkids);
1288#endif
1289
1290 /* Stop zombies */
1291 smbd_setup_sig_chld_handler();
1292
1293 smbd_process();
1294
1295 exit_server_cleanly(NULL);
1296 return(0);
1297 }
1298
1299 parent = talloc_zero(smbd_event_context(), struct smbd_parent_context);
1300 if (!parent) {
1301 exit_server("talloc(struct smbd_parent_context) failed");
1302 }
1303 parent->interactive = interactive;
1304
1305 if (!open_sockets_smbd(parent, ports))
1306 exit_server("open_sockets_smbd() failed");
1307
1308 TALLOC_FREE(frame);
1309 /* make sure we always have a valid stackframe */
1310 frame = talloc_stackframe();
1311
1312 smbd_parent_loop(parent);
1313
1314 exit_server_cleanly(NULL);
1315 TALLOC_FREE(frame);
1316 return(0);
1317}
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