source: trunk/server/source3/smbd/server.c@ 724

Last change on this file since 724 was 668, checked in by Silvan Scherrer, 14 years ago

Samba Server 3.5: sockets got not back to blocking, as fcntl is broken
File size: 34.2 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 unsigned dns_port = 0;
564
565#ifdef HAVE_ATEXIT
566 atexit(killkids);
567#endif
568
569 /* Stop zombies */
570 smbd_setup_sig_chld_handler();
571
572 /* use a reasonable default set of ports - listing on 445 and 139 */
573 if (!smb_ports) {
574 ports = lp_smb_ports();
575 if (!ports || !*ports) {
576 ports = talloc_strdup(talloc_tos(), SMB_PORTS);
577 } else {
578 ports = talloc_strdup(talloc_tos(), ports);
579 }
580 } else {
581 ports = talloc_strdup(talloc_tos(), smb_ports);
582 }
583
584 if (lp_interfaces() && lp_bind_interfaces_only()) {
585 /* We have been given an interfaces line, and been
586 told to only bind to those interfaces. Create a
587 socket per interface and bind to only these.
588 */
589
590 /* Now open a listen socket for each of the
591 interfaces. */
592 for(i = 0; i < num_interfaces; i++) {
593 const struct sockaddr_storage *ifss =
594 iface_n_sockaddr_storage(i);
595 char *tok;
596 const char *ptr;
597
598 if (ifss == NULL) {
599 DEBUG(0,("open_sockets_smbd: "
600 "interface %d has NULL IP address !\n",
601 i));
602 continue;
603 }
604
605 for (ptr=ports;
606 next_token_talloc(talloc_tos(),&ptr, &tok, " \t,");) {
607 unsigned port = atoi(tok);
608 if (port == 0 || port > 0xffff) {
609 continue;
610 }
611
612 /* Keep the first port for mDNS service
613 * registration.
614 */
615 if (dns_port == 0) {
616 dns_port = port;
617 }
618
619 if (!smbd_open_one_socket(parent, ifss, port)) {
620 return false;
621 }
622 }
623 }
624 } else {
625 /* Just bind to 0.0.0.0 - accept connections
626 from anywhere. */
627
628 char *tok;
629 const char *ptr;
630 const char *sock_addr = lp_socket_address();
631 char *sock_tok;
632 const char *sock_ptr;
633
634 if (strequal(sock_addr, "0.0.0.0") ||
635 strequal(sock_addr, "::")) {
636#if HAVE_IPV6
637 sock_addr = "::,0.0.0.0";
638#else
639 sock_addr = "0.0.0.0";
640#endif
641 }
642
643 for (sock_ptr=sock_addr;
644 next_token_talloc(talloc_tos(), &sock_ptr, &sock_tok, " \t,"); ) {
645 for (ptr=ports; next_token_talloc(talloc_tos(), &ptr, &tok, " \t,"); ) {
646 struct sockaddr_storage ss;
647
648 unsigned port = atoi(tok);
649 if (port == 0 || port > 0xffff) {
650 continue;
651 }
652
653 /* Keep the first port for mDNS service
654 * registration.
655 */
656 if (dns_port == 0) {
657 dns_port = port;
658 }
659
660 /* open an incoming socket */
661 if (!interpret_string_addr(&ss, sock_tok,
662 AI_NUMERICHOST|AI_PASSIVE)) {
663 continue;
664 }
665
666 if (!smbd_open_one_socket(parent, &ss, port)) {
667 return false;
668 }
669 }
670 }
671 }
672
673 if (parent->sockets == NULL) {
674 DEBUG(0,("open_sockets_smbd: No "
675 "sockets available to bind to.\n"));
676 return false;
677 }
678
679 /* Setup the main smbd so that we can get messages. Note that
680 do this after starting listening. This is needed as when in
681 clustered mode, ctdb won't allow us to start doing database
682 operations until it has gone thru a full startup, which
683 includes checking to see that smbd is listening. */
684 claim_connection(NULL,"",
685 FLAG_MSG_GENERAL|FLAG_MSG_SMBD|FLAG_MSG_DBWRAP);
686
687 if (!(event_add_idle(smbd_event_context(), NULL,
688 timeval_set(SMBD_HOUSEKEEPING_INTERVAL, 0),
689 "parent_housekeeping", parent_housekeeping_fn,
690 parent))) {
691 DEBUG(0, ("Could not add housekeeping event\n"));
692 exit(1);
693 }
694
695 /* Listen to messages */
696
697 messaging_register(smbd_messaging_context(), NULL,
698 MSG_SMB_SAM_SYNC, msg_sam_sync);
699 messaging_register(smbd_messaging_context(), NULL,
700 MSG_SHUTDOWN, msg_exit_server);
701 messaging_register(smbd_messaging_context(), NULL,
702 MSG_SMB_FILE_RENAME, msg_file_was_renamed);
703 messaging_register(smbd_messaging_context(), NULL,
704 MSG_SMB_CONF_UPDATED, smb_conf_updated);
705 messaging_register(smbd_messaging_context(), NULL,
706 MSG_SMB_STAT_CACHE_DELETE, smb_stat_cache_delete);
707 messaging_register(smbd_messaging_context(), NULL,
708 MSG_DEBUG, smbd_msg_debug);
709 brl_register_msgs(smbd_messaging_context());
710
711#ifdef CLUSTER_SUPPORT
712 if (lp_clustering()) {
713 ctdbd_register_reconfigure(messaging_ctdbd_connection());
714 }
715#endif
716
717#ifdef DEVELOPER
718 messaging_register(smbd_messaging_context(), NULL,
719 MSG_SMB_INJECT_FAULT, msg_inject_fault);
720#endif
721
722 if (dns_port != 0) {
723#ifdef WITH_DNSSD_SUPPORT
724 smbd_setup_mdns_registration(smbd_event_context(),
725 parent, dns_port);
726#endif
727#ifdef WITH_AVAHI_SUPPORT
728 void *avahi_conn;
729
730 avahi_conn = avahi_start_register(
731 smbd_event_context(), smbd_event_context(), dns_port);
732 if (avahi_conn == NULL) {
733 DEBUG(10, ("avahi_start_register failed\n"));
734 }
735#endif
736 }
737
738 return true;
739}
740
741static void smbd_parent_loop(struct smbd_parent_context *parent)
742{
743 /* now accept incoming connections - forking a new process
744 for each incoming connection */
745 DEBUG(2,("waiting for connections\n"));
746 while (1) {
747 int ret;
748 TALLOC_CTX *frame = talloc_stackframe();
749 ret = tevent_loop_once(smbd_event_context());
750 if (ret != 0) {
751 exit_server_cleanly("tevent_loop_once() error");
752 }
753
754 TALLOC_FREE(frame);
755 } /* end while 1 */
756
757/* NOTREACHED return True; */
758}
759
760/***************************************************************************
761 purge stale printers and reload from pre-populated pcap cache
762***************************************************************************/
763void reload_printers(void)
764{
765 int snum;
766 int n_services = lp_numservices();
767 int pnum = lp_servicenumber(PRINTERS_NAME);
768 const char *pname;
769
770 DEBUG(10, ("reloading printer services from pcap cache\n"));
771 for (snum = 0; snum < n_services; snum++) {
772 /* avoid removing PRINTERS_NAME or non-autoloaded printers */
773 if (snum == pnum || !(lp_snum_ok(snum) && lp_print_ok(snum) &&
774 lp_autoloaded(snum)))
775 continue;
776
777 pname = lp_printername(snum);
778 if (!pcap_printername_ok(pname)) {
779 DEBUG(3, ("removing stale printer %s\n", pname));
780
781 if (is_printer_published(NULL, snum, NULL))
782 nt_printer_publish(NULL, snum, DSPRINT_UNPUBLISH);
783 del_a_printer(pname);
784 lp_killservice(snum);
785 }
786 }
787
788 load_printers();
789}
790
791/****************************************************************************
792 Reload the services file.
793**************************************************************************/
794
795bool reload_services(bool test)
796{
797 bool ret;
798
799 if (lp_loaded()) {
800 char *fname = lp_configfile();
801 if (file_exist(fname) &&
802 !strcsequal(fname, get_dyn_CONFIGFILE())) {
803 set_dyn_CONFIGFILE(fname);
804 test = False;
805 }
806 }
807
808 reopen_logs();
809
810 if (test && !lp_file_list_changed())
811 return(True);
812
813 lp_killunused(conn_snum_used);
814
815 ret = lp_load(get_dyn_CONFIGFILE(), False, False, True, True);
816
817 pcap_cache_reload(&reload_printers);
818
819 /* perhaps the config filename is now set */
820 if (!test)
821 reload_services(True);
822
823 reopen_logs();
824
825 load_interfaces();
826
827 if (smbd_server_fd() != -1) {
828 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
829 set_socket_options(smbd_server_fd(), lp_socket_options());
830 }
831
832 mangle_reset_cache();
833 reset_stat_cache();
834
835 /* this forces service parameters to be flushed */
836 set_current_service(NULL,0,True);
837
838 return(ret);
839}
840
841/****************************************************************************
842 Exit the server.
843****************************************************************************/
844
845/* Reasons for shutting down a server process. */
846enum server_exit_reason { SERVER_EXIT_NORMAL, SERVER_EXIT_ABNORMAL };
847
848static void exit_server_common(enum server_exit_reason how,
849 const char *const reason) _NORETURN_;
850
851static void exit_server_common(enum server_exit_reason how,
852 const char *const reason)
853{
854 bool had_open_conn = false;
855 struct smbd_server_connection *sconn = smbd_server_conn;
856
857 if (!exit_firsttime)
858 exit(0);
859 exit_firsttime = false;
860
861 change_to_root_user();
862
863 if (sconn && sconn->smb1.negprot.auth_context) {
864 struct auth_context *a = sconn->smb1.negprot.auth_context;
865 a->free(&sconn->smb1.negprot.auth_context);
866 }
867
868 if (sconn) {
869 had_open_conn = conn_close_all(sconn);
870 invalidate_all_vuids(sconn);
871 }
872
873 /* 3 second timeout. */
874 print_notify_send_messages(smbd_messaging_context(), 3);
875
876 /* delete our entry in the connections database. */
877 yield_connection(NULL,"");
878
879#ifdef WITH_DFS
880 if (dcelogin_atmost_once) {
881 dfs_unlogin();
882 }
883#endif
884
885#ifdef USE_DMAPI
886 /* Destroy Samba DMAPI session only if we are master smbd process */
887 if (am_parent) {
888 if (!dmapi_destroy_session()) {
889 DEBUG(0,("Unable to close Samba DMAPI session\n"));
890 }
891 }
892#endif
893
894 locking_end();
895 printing_end();
896
897 /*
898 * we need to force the order of freeing the following,
899 * because smbd_msg_ctx is not a talloc child of smbd_server_conn.
900 */
901 sconn = NULL;
902 TALLOC_FREE(smbd_server_conn);
903 TALLOC_FREE(smbd_msg_ctx);
904 TALLOC_FREE(smbd_event_ctx);
905
906 if (how != SERVER_EXIT_NORMAL) {
907 int oldlevel = DEBUGLEVEL;
908
909 DEBUGLEVEL = 10;
910
911 DEBUGSEP(0);
912 DEBUG(0,("Abnormal server exit: %s\n",
913 reason ? reason : "no explanation provided"));
914 DEBUGSEP(0);
915
916 log_stack_trace();
917
918 DEBUGLEVEL = oldlevel;
919 dump_core();
920
921 } else {
922 DEBUG(3,("Server exit (%s)\n",
923 (reason ? reason : "normal exit")));
924 if (am_parent) {
925 pidfile_unlink();
926 }
927 gencache_stabilize();
928 }
929
930 /* if we had any open SMB connections when we exited then we
931 need to tell the parent smbd so that it can trigger a retry
932 of any locks we may have been holding or open files we were
933 blocking */
934 if (had_open_conn) {
935 exit(1);
936 } else {
937 exit(0);
938 }
939}
940
941void exit_server(const char *const explanation)
942{
943 exit_server_common(SERVER_EXIT_ABNORMAL, explanation);
944}
945
946void exit_server_cleanly(const char *const explanation)
947{
948 exit_server_common(SERVER_EXIT_NORMAL, explanation);
949}
950
951void exit_server_fault(void)
952{
953 exit_server("critical server fault");
954}
955
956/****************************************************************************
957 Initialise connect, service and file structs.
958****************************************************************************/
959
960static bool init_structs(void )
961{
962 /*
963 * Set the machine NETBIOS name if not already
964 * set from the config file.
965 */
966
967 if (!init_names())
968 return False;
969
970 file_init();
971
972 if (!secrets_init())
973 return False;
974
975 return True;
976}
977
978/****************************************************************************
979 main program.
980****************************************************************************/
981
982/* Declare prototype for build_options() to avoid having to run it through
983 mkproto.h. Mixing $(builddir) and $(srcdir) source files in the current
984 prototype generation system is too complicated. */
985
986extern void build_options(bool screen);
987
988 int main(int argc,const char *argv[])
989{
990 /* shall I run as a daemon */
991 bool is_daemon = false;
992 bool interactive = false;
993 bool Fork = true;
994 bool no_process_group = false;
995 bool log_stdout = false;
996 char *ports = NULL;
997 char *profile_level = NULL;
998 int opt;
999 poptContext pc;
1000 bool print_build_options = False;
1001 enum {
1002 OPT_DAEMON = 1000,
1003 OPT_INTERACTIVE,
1004 OPT_FORK,
1005 OPT_NO_PROCESS_GROUP,
1006 OPT_LOG_STDOUT
1007 };
1008 struct poptOption long_options[] = {
1009 POPT_AUTOHELP
1010 {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1011 {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)"},
1012 {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools, etc.)" },
1013 {"no-process-group", '\0', POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1014 {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1015 {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
1016 {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
1017 {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
1018 POPT_COMMON_SAMBA
1019 POPT_COMMON_DYNCONFIG
1020 POPT_TABLEEND
1021 };
1022 struct smbd_parent_context *parent = NULL;
1023 TALLOC_CTX *frame = talloc_stackframe(); /* Setup tos. */
1024
1025 smbd_init_globals();
1026
1027 TimeInit();
1028
1029#ifdef HAVE_SET_AUTH_PARAMETERS
1030 set_auth_parameters(argc,argv);
1031#endif
1032
1033 pc = poptGetContext("smbd", argc, argv, long_options, 0);
1034 while((opt = poptGetNextOpt(pc)) != -1) {
1035 switch (opt) {
1036 case OPT_DAEMON:
1037 is_daemon = true;
1038 break;
1039 case OPT_INTERACTIVE:
1040 interactive = true;
1041 break;
1042 case OPT_FORK:
1043 Fork = false;
1044 break;
1045 case OPT_NO_PROCESS_GROUP:
1046 no_process_group = true;
1047 break;
1048 case OPT_LOG_STDOUT:
1049 log_stdout = true;
1050 break;
1051 case 'b':
1052 print_build_options = True;
1053 break;
1054 default:
1055 d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1056 poptBadOption(pc, 0), poptStrerror(opt));
1057 poptPrintUsage(pc, stderr, 0);
1058 exit(1);
1059 }
1060 }
1061 poptFreeContext(pc);
1062
1063 if (interactive) {
1064 Fork = False;
1065 log_stdout = True;
1066 }
1067
1068 setup_logging(argv[0],log_stdout);
1069
1070 if (print_build_options) {
1071 build_options(True); /* Display output to screen as well as debug */
1072 exit(0);
1073 }
1074
1075 load_case_tables();
1076
1077#ifdef HAVE_SETLUID
1078 /* needed for SecureWare on SCO */
1079 setluid(0);
1080#endif
1081
1082 sec_init();
1083
1084 set_remote_machine_name("smbd", False);
1085
1086 if (interactive && (DEBUGLEVEL >= 9)) {
1087 talloc_enable_leak_report();
1088 }
1089
1090 if (log_stdout && Fork) {
1091 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
1092 exit(1);
1093 }
1094
1095 /* we want to re-seed early to prevent time delays causing
1096 client problems at a later date. (tridge) */
1097 generate_random_buffer(NULL, 0);
1098
1099 /* make absolutely sure we run as root - to handle cases where people
1100 are crazy enough to have it setuid */
1101
1102 gain_root_privilege();
1103 gain_root_group_privilege();
1104
1105 fault_setup((void (*)(void *))exit_server_fault);
1106 dump_core_setup("smbd");
1107
1108 /* we are never interested in SIGPIPE */
1109 BlockSignals(True,SIGPIPE);
1110
1111#if defined(SIGFPE)
1112 /* we are never interested in SIGFPE */
1113 BlockSignals(True,SIGFPE);
1114#endif
1115
1116#if defined(SIGUSR2)
1117 /* We are no longer interested in USR2 */
1118 BlockSignals(True,SIGUSR2);
1119#endif
1120
1121 /* POSIX demands that signals are inherited. If the invoking process has
1122 * these signals masked, we will have problems, as we won't recieve them. */
1123 BlockSignals(False, SIGHUP);
1124 BlockSignals(False, SIGUSR1);
1125 BlockSignals(False, SIGTERM);
1126
1127 /* Ensure we leave no zombies until we
1128 * correctly set up child handling below. */
1129
1130 CatchChild();
1131
1132 /* we want total control over the permissions on created files,
1133 so set our umask to 0 */
1134 umask(0);
1135
1136 init_sec_ctx();
1137
1138 reopen_logs();
1139
1140#ifdef __OS2__
1141 unsigned long _System DosSetPriority (unsigned long ulScope, unsigned long ulClass, long lDelta, unsigned long ulID);
1142 int rc;
1143 rc = DosSetPriority(
1144 0, /* Scope: only one process */
1145 4, /* set to PRTYC_FOREGROUNDSERVER */
1146 0, /* set delta - was 0 */
1147 0); /* Assume current process */
1148 DEBUG(0,( "Server priority set to PRTYC_FOREGROUNDSERVER\n"));
1149#endif
1150
1151 DEBUG(0,("smbd version %s started.\n", samba_version_string()));
1152 DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1153
1154 DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
1155 (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
1156
1157 /* Output the build options to the debug log */
1158 build_options(False);
1159
1160 if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
1161 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
1162 exit(1);
1163 }
1164
1165 if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1166 DEBUG(0, ("error opening config file\n"));
1167 exit(1);
1168 }
1169
1170 if (smbd_messaging_context() == NULL)
1171 exit(1);
1172
1173 if (!reload_services(False))
1174 return(-1);
1175
1176 init_structs();
1177
1178#ifdef WITH_PROFILE
1179 if (!profile_setup(smbd_messaging_context(), False)) {
1180 DEBUG(0,("ERROR: failed to setup profiling\n"));
1181 return -1;
1182 }
1183 if (profile_level != NULL) {
1184 int pl = atoi(profile_level);
1185 struct server_id src;
1186
1187 DEBUG(1, ("setting profiling level: %s\n",profile_level));
1188 src.pid = getpid();
1189 set_profile_level(pl, src);
1190 }
1191#endif
1192
1193 DEBUG(3,( "loaded services\n"));
1194
1195 if (!is_daemon && !is_a_socket(0)) {
1196 if (!interactive)
1197 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
1198
1199 /*
1200 * Setting is_daemon here prevents us from eventually calling
1201 * the open_sockets_inetd()
1202 */
1203
1204 is_daemon = True;
1205 }
1206
1207 if (is_daemon && !interactive) {
1208 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1209 become_daemon(Fork, no_process_group);
1210 }
1211
1212#if HAVE_SETPGID
1213 /*
1214 * If we're interactive we want to set our own process group for
1215 * signal management.
1216 */
1217 if (interactive && !no_process_group)
1218 setpgid( (pid_t)0, (pid_t)0);
1219#endif
1220
1221 if (!directory_exist(lp_lockdir()))
1222 mkdir(lp_lockdir(), 0755);
1223
1224 if (is_daemon)
1225 pidfile_create("smbd");
1226
1227 if (!NT_STATUS_IS_OK(reinit_after_fork(smbd_messaging_context(),
1228 smbd_event_context(), false))) {
1229 DEBUG(0,("reinit_after_fork() failed\n"));
1230 exit(1);
1231 }
1232
1233 smbd_setup_sig_term_handler();
1234 smbd_setup_sig_hup_handler();
1235
1236 /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1237
1238 if (smbd_memcache() == NULL) {
1239 exit(1);
1240 }
1241
1242 memcache_set_global(smbd_memcache());
1243
1244 /* Initialise the password backed before the global_sam_sid
1245 to ensure that we fetch from ldap before we make a domain sid up */
1246
1247 if(!initialize_password_db(False, smbd_event_context()))
1248 exit(1);
1249
1250 if (!secrets_init()) {
1251 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1252 exit(1);
1253 }
1254
1255 if(!get_global_sam_sid()) {
1256 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1257 exit(1);
1258 }
1259
1260 if (!session_init())
1261 exit(1);
1262
1263 if (!connections_init(True))
1264 exit(1);
1265
1266 if (!locking_init())
1267 exit(1);
1268
1269 namecache_enable();
1270
1271 if (!W_ERROR_IS_OK(registry_init_full()))
1272 exit(1);
1273
1274#if 0
1275 if (!init_svcctl_db())
1276 exit(1);
1277#endif
1278
1279 if (!print_backend_init(smbd_messaging_context()))
1280 exit(1);
1281
1282 if (!init_guest_info()) {
1283 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1284 return -1;
1285 }
1286
1287 /* Open the share_info.tdb here, so we don't have to open
1288 after the fork on every single connection. This is a small
1289 performance improvment and reduces the total number of system
1290 fds used. */
1291 if (!share_info_db_init()) {
1292 DEBUG(0,("ERROR: failed to load share info db.\n"));
1293 exit(1);
1294 }
1295
1296 /* only start the background queue daemon if we are
1297 running as a daemon -- bad things will happen if
1298 smbd is launched via inetd and we fork a copy of
1299 ourselves here */
1300
1301 if (is_daemon && !interactive
1302 && lp_parm_bool(-1, "smbd", "backgroundqueue", true)) {
1303 start_background_queue();
1304 }
1305
1306 if (!is_daemon) {
1307 /* inetd mode */
1308 TALLOC_FREE(frame);
1309
1310 /* Started from inetd. fd 0 is the socket. */
1311 /* We will abort gracefully when the client or remote system
1312 goes away */
1313 smbd_set_server_fd(dup(0));
1314
1315 /* close our standard file descriptors */
1316 close_low_fds(False); /* Don't close stderr */
1317
1318#ifdef HAVE_ATEXIT
1319 atexit(killkids);
1320#endif
1321
1322 /* Stop zombies */
1323 smbd_setup_sig_chld_handler();
1324
1325 smbd_process();
1326
1327 exit_server_cleanly(NULL);
1328 return(0);
1329 }
1330
1331 parent = talloc_zero(smbd_event_context(), struct smbd_parent_context);
1332 if (!parent) {
1333 exit_server("talloc(struct smbd_parent_context) failed");
1334 }
1335 parent->interactive = interactive;
1336
1337 if (!open_sockets_smbd(parent, ports))
1338 exit_server("open_sockets_smbd() failed");
1339
1340 TALLOC_FREE(frame);
1341 /* make sure we always have a valid stackframe */
1342 frame = talloc_stackframe();
1343
1344 smbd_parent_loop(parent);
1345
1346 exit_server_cleanly(NULL);
1347 TALLOC_FREE(frame);
1348 return(0);
1349}
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