source: branches/samba-3.5.x/source3/smbd/server.c@ 736

Last change on this file since 736 was 736, checked in by Silvan Scherrer, 13 years ago

Samba Server 3.5: update branche to 3.5.16
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 TALLOC_FREE(fname);
807 }
808
809 reopen_logs();
810
811 if (test && !lp_file_list_changed())
812 return(True);
813
814 lp_killunused(conn_snum_used);
815
816 ret = lp_load(get_dyn_CONFIGFILE(), False, False, True, True);
817
818 pcap_cache_reload(&reload_printers);
819
820 /* perhaps the config filename is now set */
821 if (!test)
822 reload_services(True);
823
824 reopen_logs();
825
826 load_interfaces();
827
828 if (smbd_server_fd() != -1) {
829 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
830 set_socket_options(smbd_server_fd(), lp_socket_options());
831 }
832
833 mangle_reset_cache();
834 reset_stat_cache();
835
836 /* this forces service parameters to be flushed */
837 set_current_service(NULL,0,True);
838
839 return(ret);
840}
841
842/****************************************************************************
843 Exit the server.
844****************************************************************************/
845
846/* Reasons for shutting down a server process. */
847enum server_exit_reason { SERVER_EXIT_NORMAL, SERVER_EXIT_ABNORMAL };
848
849static void exit_server_common(enum server_exit_reason how,
850 const char *const reason) _NORETURN_;
851
852static void exit_server_common(enum server_exit_reason how,
853 const char *const reason)
854{
855 bool had_open_conn = false;
856 struct smbd_server_connection *sconn = smbd_server_conn;
857
858 if (!exit_firsttime)
859 exit(0);
860 exit_firsttime = false;
861
862 change_to_root_user();
863
864 if (sconn && sconn->smb1.negprot.auth_context) {
865 struct auth_context *a = sconn->smb1.negprot.auth_context;
866 a->free(&sconn->smb1.negprot.auth_context);
867 }
868
869 if (sconn) {
870 had_open_conn = conn_close_all(sconn);
871 invalidate_all_vuids(sconn);
872 }
873
874 /* 3 second timeout. */
875 print_notify_send_messages(smbd_messaging_context(), 3);
876
877 /* delete our entry in the connections database. */
878 yield_connection(NULL,"");
879
880#ifdef WITH_DFS
881 if (dcelogin_atmost_once) {
882 dfs_unlogin();
883 }
884#endif
885
886#ifdef USE_DMAPI
887 /* Destroy Samba DMAPI session only if we are master smbd process */
888 if (am_parent) {
889 if (!dmapi_destroy_session()) {
890 DEBUG(0,("Unable to close Samba DMAPI session\n"));
891 }
892 }
893#endif
894
895 locking_end();
896 printing_end();
897
898 /*
899 * we need to force the order of freeing the following,
900 * because smbd_msg_ctx is not a talloc child of smbd_server_conn.
901 */
902 sconn = NULL;
903 TALLOC_FREE(smbd_server_conn);
904 TALLOC_FREE(smbd_msg_ctx);
905 TALLOC_FREE(smbd_event_ctx);
906
907 if (how != SERVER_EXIT_NORMAL) {
908 int oldlevel = DEBUGLEVEL;
909
910 DEBUGLEVEL = 10;
911
912 DEBUGSEP(0);
913 DEBUG(0,("Abnormal server exit: %s\n",
914 reason ? reason : "no explanation provided"));
915 DEBUGSEP(0);
916
917 log_stack_trace();
918
919 DEBUGLEVEL = oldlevel;
920 dump_core();
921
922 } else {
923 DEBUG(3,("Server exit (%s)\n",
924 (reason ? reason : "normal exit")));
925 if (am_parent) {
926 pidfile_unlink();
927 }
928 gencache_stabilize();
929 }
930
931 /* if we had any open SMB connections when we exited then we
932 need to tell the parent smbd so that it can trigger a retry
933 of any locks we may have been holding or open files we were
934 blocking */
935 if (had_open_conn) {
936 exit(1);
937 } else {
938 exit(0);
939 }
940}
941
942void exit_server(const char *const explanation)
943{
944 exit_server_common(SERVER_EXIT_ABNORMAL, explanation);
945}
946
947void exit_server_cleanly(const char *const explanation)
948{
949 exit_server_common(SERVER_EXIT_NORMAL, explanation);
950}
951
952void exit_server_fault(void)
953{
954 exit_server("critical server fault");
955}
956
957/****************************************************************************
958 Initialise connect, service and file structs.
959****************************************************************************/
960
961static bool init_structs(void )
962{
963 /*
964 * Set the machine NETBIOS name if not already
965 * set from the config file.
966 */
967
968 if (!init_names())
969 return False;
970
971 file_init();
972
973 if (!secrets_init())
974 return False;
975
976 return True;
977}
978
979/****************************************************************************
980 main program.
981****************************************************************************/
982
983/* Declare prototype for build_options() to avoid having to run it through
984 mkproto.h. Mixing $(builddir) and $(srcdir) source files in the current
985 prototype generation system is too complicated. */
986
987extern void build_options(bool screen);
988
989 int main(int argc,const char *argv[])
990{
991 /* shall I run as a daemon */
992 bool is_daemon = false;
993 bool interactive = false;
994 bool Fork = true;
995 bool no_process_group = false;
996 bool log_stdout = false;
997 char *ports = NULL;
998 char *profile_level = NULL;
999 int opt;
1000 poptContext pc;
1001 bool print_build_options = False;
1002 enum {
1003 OPT_DAEMON = 1000,
1004 OPT_INTERACTIVE,
1005 OPT_FORK,
1006 OPT_NO_PROCESS_GROUP,
1007 OPT_LOG_STDOUT
1008 };
1009 struct poptOption long_options[] = {
1010 POPT_AUTOHELP
1011 {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1012 {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)"},
1013 {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools, etc.)" },
1014 {"no-process-group", '\0', POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1015 {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1016 {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
1017 {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
1018 {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
1019 POPT_COMMON_SAMBA
1020 POPT_COMMON_DYNCONFIG
1021 POPT_TABLEEND
1022 };
1023 struct smbd_parent_context *parent = NULL;
1024 TALLOC_CTX *frame = talloc_stackframe(); /* Setup tos. */
1025
1026 smbd_init_globals();
1027
1028 TimeInit();
1029
1030#ifdef HAVE_SET_AUTH_PARAMETERS
1031 set_auth_parameters(argc,argv);
1032#endif
1033
1034 pc = poptGetContext("smbd", argc, argv, long_options, 0);
1035 while((opt = poptGetNextOpt(pc)) != -1) {
1036 switch (opt) {
1037 case OPT_DAEMON:
1038 is_daemon = true;
1039 break;
1040 case OPT_INTERACTIVE:
1041 interactive = true;
1042 break;
1043 case OPT_FORK:
1044 Fork = false;
1045 break;
1046 case OPT_NO_PROCESS_GROUP:
1047 no_process_group = true;
1048 break;
1049 case OPT_LOG_STDOUT:
1050 log_stdout = true;
1051 break;
1052 case 'b':
1053 print_build_options = True;
1054 break;
1055 default:
1056 d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1057 poptBadOption(pc, 0), poptStrerror(opt));
1058 poptPrintUsage(pc, stderr, 0);
1059 exit(1);
1060 }
1061 }
1062 poptFreeContext(pc);
1063
1064 if (interactive) {
1065 Fork = False;
1066 log_stdout = True;
1067 }
1068
1069 setup_logging(argv[0],log_stdout);
1070
1071 if (print_build_options) {
1072 build_options(True); /* Display output to screen as well as debug */
1073 exit(0);
1074 }
1075
1076 load_case_tables();
1077
1078#ifdef HAVE_SETLUID
1079 /* needed for SecureWare on SCO */
1080 setluid(0);
1081#endif
1082
1083 sec_init();
1084
1085 set_remote_machine_name("smbd", False);
1086
1087 if (interactive && (DEBUGLEVEL >= 9)) {
1088 talloc_enable_leak_report();
1089 }
1090
1091 if (log_stdout && Fork) {
1092 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
1093 exit(1);
1094 }
1095
1096 /* we want to re-seed early to prevent time delays causing
1097 client problems at a later date. (tridge) */
1098 generate_random_buffer(NULL, 0);
1099
1100 /* make absolutely sure we run as root - to handle cases where people
1101 are crazy enough to have it setuid */
1102
1103 gain_root_privilege();
1104 gain_root_group_privilege();
1105
1106 fault_setup((void (*)(void *))exit_server_fault);
1107 dump_core_setup("smbd");
1108
1109 /* we are never interested in SIGPIPE */
1110 BlockSignals(True,SIGPIPE);
1111
1112#if defined(SIGFPE)
1113 /* we are never interested in SIGFPE */
1114 BlockSignals(True,SIGFPE);
1115#endif
1116
1117#if defined(SIGUSR2)
1118 /* We are no longer interested in USR2 */
1119 BlockSignals(True,SIGUSR2);
1120#endif
1121
1122 /* POSIX demands that signals are inherited. If the invoking process has
1123 * these signals masked, we will have problems, as we won't recieve them. */
1124 BlockSignals(False, SIGHUP);
1125 BlockSignals(False, SIGUSR1);
1126 BlockSignals(False, SIGTERM);
1127
1128 /* Ensure we leave no zombies until we
1129 * correctly set up child handling below. */
1130
1131 CatchChild();
1132
1133 /* we want total control over the permissions on created files,
1134 so set our umask to 0 */
1135 umask(0);
1136
1137 init_sec_ctx();
1138
1139 reopen_logs();
1140
1141#ifdef __OS2__
1142 unsigned long _System DosSetPriority (unsigned long ulScope, unsigned long ulClass, long lDelta, unsigned long ulID);
1143 int rc;
1144 rc = DosSetPriority(
1145 0, /* Scope: only one process */
1146 4, /* set to PRTYC_FOREGROUNDSERVER */
1147 0, /* set delta - was 0 */
1148 0); /* Assume current process */
1149 DEBUG(0,( "Server priority set to PRTYC_FOREGROUNDSERVER\n"));
1150#endif
1151
1152 DEBUG(0,("smbd version %s started.\n", samba_version_string()));
1153 DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1154
1155 DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
1156 (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
1157
1158 /* Output the build options to the debug log */
1159 build_options(False);
1160
1161 if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
1162 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
1163 exit(1);
1164 }
1165
1166 if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1167 DEBUG(0, ("error opening config file\n"));
1168 exit(1);
1169 }
1170
1171 if (smbd_messaging_context() == NULL)
1172 exit(1);
1173
1174 if (!reload_services(False))
1175 return(-1);
1176
1177 init_structs();
1178
1179#ifdef WITH_PROFILE
1180 if (!profile_setup(smbd_messaging_context(), False)) {
1181 DEBUG(0,("ERROR: failed to setup profiling\n"));
1182 return -1;
1183 }
1184 if (profile_level != NULL) {
1185 int pl = atoi(profile_level);
1186 struct server_id src;
1187
1188 DEBUG(1, ("setting profiling level: %s\n",profile_level));
1189 src.pid = getpid();
1190 set_profile_level(pl, src);
1191 }
1192#endif
1193
1194 DEBUG(3,( "loaded services\n"));
1195
1196 if (!is_daemon && !is_a_socket(0)) {
1197 if (!interactive)
1198 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
1199
1200 /*
1201 * Setting is_daemon here prevents us from eventually calling
1202 * the open_sockets_inetd()
1203 */
1204
1205 is_daemon = True;
1206 }
1207
1208 if (is_daemon && !interactive) {
1209 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1210 become_daemon(Fork, no_process_group);
1211 }
1212
1213#if HAVE_SETPGID
1214 /*
1215 * If we're interactive we want to set our own process group for
1216 * signal management.
1217 */
1218 if (interactive && !no_process_group)
1219 setpgid( (pid_t)0, (pid_t)0);
1220#endif
1221
1222 if (!directory_exist(lp_lockdir()))
1223 mkdir(lp_lockdir(), 0755);
1224
1225 if (is_daemon)
1226 pidfile_create("smbd");
1227
1228 if (!NT_STATUS_IS_OK(reinit_after_fork(smbd_messaging_context(),
1229 smbd_event_context(), false))) {
1230 DEBUG(0,("reinit_after_fork() failed\n"));
1231 exit(1);
1232 }
1233
1234 smbd_setup_sig_term_handler();
1235 smbd_setup_sig_hup_handler();
1236
1237 /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1238
1239 if (smbd_memcache() == NULL) {
1240 exit(1);
1241 }
1242
1243 memcache_set_global(smbd_memcache());
1244
1245 /* Initialise the password backed before the global_sam_sid
1246 to ensure that we fetch from ldap before we make a domain sid up */
1247
1248 if(!initialize_password_db(False, smbd_event_context()))
1249 exit(1);
1250
1251 if (!secrets_init()) {
1252 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1253 exit(1);
1254 }
1255
1256 if(!get_global_sam_sid()) {
1257 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1258 exit(1);
1259 }
1260
1261 if (!session_init())
1262 exit(1);
1263
1264 if (!connections_init(True))
1265 exit(1);
1266
1267 if (!locking_init())
1268 exit(1);
1269
1270 namecache_enable();
1271
1272 if (!W_ERROR_IS_OK(registry_init_full()))
1273 exit(1);
1274
1275#if 0
1276 if (!init_svcctl_db())
1277 exit(1);
1278#endif
1279
1280 if (!print_backend_init(smbd_messaging_context()))
1281 exit(1);
1282
1283 if (!init_guest_info()) {
1284 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1285 return -1;
1286 }
1287
1288 /* Open the share_info.tdb here, so we don't have to open
1289 after the fork on every single connection. This is a small
1290 performance improvment and reduces the total number of system
1291 fds used. */
1292 if (!share_info_db_init()) {
1293 DEBUG(0,("ERROR: failed to load share info db.\n"));
1294 exit(1);
1295 }
1296
1297 /* only start the background queue daemon if we are
1298 running as a daemon -- bad things will happen if
1299 smbd is launched via inetd and we fork a copy of
1300 ourselves here */
1301
1302 if (is_daemon && !interactive
1303 && lp_parm_bool(-1, "smbd", "backgroundqueue", true)) {
1304 start_background_queue();
1305 }
1306
1307 if (!is_daemon) {
1308 /* inetd mode */
1309 TALLOC_FREE(frame);
1310
1311 /* Started from inetd. fd 0 is the socket. */
1312 /* We will abort gracefully when the client or remote system
1313 goes away */
1314 smbd_set_server_fd(dup(0));
1315
1316 /* close our standard file descriptors */
1317 close_low_fds(False); /* Don't close stderr */
1318
1319#ifdef HAVE_ATEXIT
1320 atexit(killkids);
1321#endif
1322
1323 /* Stop zombies */
1324 smbd_setup_sig_chld_handler();
1325
1326 smbd_process();
1327
1328 exit_server_cleanly(NULL);
1329 return(0);
1330 }
1331
1332 parent = talloc_zero(smbd_event_context(), struct smbd_parent_context);
1333 if (!parent) {
1334 exit_server("talloc(struct smbd_parent_context) failed");
1335 }
1336 parent->interactive = interactive;
1337
1338 if (!open_sockets_smbd(parent, ports))
1339 exit_server("open_sockets_smbd() failed");
1340
1341 TALLOC_FREE(frame);
1342 /* make sure we always have a valid stackframe */
1343 frame = talloc_stackframe();
1344
1345 smbd_parent_loop(parent);
1346
1347 exit_server_cleanly(NULL);
1348 TALLOC_FREE(frame);
1349 return(0);
1350}
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