source: trunk/server/source3/smbd/server.c@ 422

Last change on this file since 422 was 414, checked in by Herwig Bauernfeind, 16 years ago

Samba 3.5.0: Initial import
File size: 30.7 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
222static void remove_child_pid(pid_t pid, bool unclean_shutdown)
223{
224 struct child_pid *child;
225
226 if (unclean_shutdown) {
227 /* a child terminated uncleanly so tickle all processes to see
228 if they can grab any of the pending locks
229 */
230 DEBUG(3,(__location__ " Unclean shutdown of pid %u\n", (unsigned int)pid));
231 messaging_send_buf(smbd_messaging_context(), procid_self(),
232 MSG_SMB_BRL_VALIDATE, NULL, 0);
233 message_send_all(smbd_messaging_context(),
234 MSG_SMB_UNLOCK, NULL, 0, NULL);
235 }
236
237 for (child = children; child != NULL; child = child->next) {
238 if (child->pid == pid) {
239 struct child_pid *tmp = child;
240 DLIST_REMOVE(children, child);
241 SAFE_FREE(tmp);
242 num_children -= 1;
243 return;
244 }
245 }
246
247 DEBUG(0, ("Could not find child %d -- ignoring\n", (int)pid));
248}
249
250/****************************************************************************
251 Have we reached the process limit ?
252****************************************************************************/
253
254static bool allowable_number_of_smbd_processes(void)
255{
256 int max_processes = lp_max_smbd_processes();
257
258 if (!max_processes)
259 return True;
260
261 return num_children < max_processes;
262}
263
264static void smbd_sig_chld_handler(struct tevent_context *ev,
265 struct tevent_signal *se,
266 int signum,
267 int count,
268 void *siginfo,
269 void *private_data)
270{
271 pid_t pid;
272 int status;
273
274 while ((pid = sys_waitpid(-1, &status, WNOHANG)) > 0) {
275 bool unclean_shutdown = False;
276
277 /* If the child terminated normally, assume
278 it was an unclean shutdown unless the
279 status is 0
280 */
281 if (WIFEXITED(status)) {
282 unclean_shutdown = WEXITSTATUS(status);
283 }
284 /* If the child terminated due to a signal
285 we always assume it was unclean.
286 */
287 if (WIFSIGNALED(status)) {
288 unclean_shutdown = True;
289 }
290 remove_child_pid(pid, unclean_shutdown);
291 }
292}
293
294static void smbd_setup_sig_chld_handler(void)
295{
296 struct tevent_signal *se;
297
298 se = tevent_add_signal(smbd_event_context(),
299 smbd_event_context(),
300 SIGCHLD, 0,
301 smbd_sig_chld_handler,
302 NULL);
303 if (!se) {
304 exit_server("failed to setup SIGCHLD handler");
305 }
306}
307
308struct smbd_open_socket;
309
310struct smbd_parent_context {
311 bool interactive;
312
313 /* the list of listening sockets */
314 struct smbd_open_socket *sockets;
315};
316
317struct smbd_open_socket {
318 struct smbd_open_socket *prev, *next;
319 struct smbd_parent_context *parent;
320 int fd;
321 struct tevent_fd *fde;
322};
323
324static void smbd_open_socket_close_fn(struct tevent_context *ev,
325 struct tevent_fd *fde,
326 int fd,
327 void *private_data)
328{
329 /* this might be the socket_wrapper swrap_close() */
330 close(fd);
331}
332
333static void smbd_accept_connection(struct tevent_context *ev,
334 struct tevent_fd *fde,
335 uint16_t flags,
336 void *private_data)
337{
338 struct smbd_open_socket *s = talloc_get_type_abort(private_data,
339 struct smbd_open_socket);
340 struct sockaddr_storage addr;
341 socklen_t in_addrlen = sizeof(addr);
342 pid_t pid = 0;
343
344 smbd_set_server_fd(accept(s->fd,(struct sockaddr *)&addr,&in_addrlen));
345
346 if (smbd_server_fd() == -1 && errno == EINTR)
347 return;
348
349 if (smbd_server_fd() == -1) {
350 DEBUG(0,("open_sockets_smbd: accept: %s\n",
351 strerror(errno)));
352 return;
353 }
354
355 if (s->parent->interactive) {
356 smbd_process();
357 exit_server_cleanly("end of interactive mode");
358 return;
359 }
360
361 if (!allowable_number_of_smbd_processes()) {
362 close(smbd_server_fd());
363 smbd_set_server_fd(-1);
364 return;
365 }
366
367 pid = sys_fork();
368 if (pid == 0) {
369 NTSTATUS status = NT_STATUS_OK;
370 /* Child code ... */
371 am_parent = 0;
372
373 /* Stop zombies, the parent explicitly handles
374 * them, counting worker smbds. */
375 CatchChild();
376
377 /* close our standard file
378 descriptors */
379 close_low_fds(False);
380
381 /*
382 * Can't use TALLOC_FREE here. Nulling out the argument to it
383 * would overwrite memory we've just freed.
384 */
385 talloc_free(s->parent);
386 s = NULL;
387
388 status = reinit_after_fork(smbd_messaging_context(),
389 smbd_event_context(), true);
390 if (!NT_STATUS_IS_OK(status)) {
391 if (NT_STATUS_EQUAL(status,
392 NT_STATUS_TOO_MANY_OPENED_FILES)) {
393 DEBUG(0,("child process cannot initialize "
394 "because too many files are open\n"));
395 goto exit;
396 }
397 DEBUG(0,("reinit_after_fork() failed\n"));
398 smb_panic("reinit_after_fork() failed");
399 }
400
401 smbd_setup_sig_term_handler();
402 smbd_setup_sig_hup_handler();
403
404 smbd_process();
405 exit:
406 exit_server_cleanly("end of child");
407 return;
408 } else if (pid < 0) {
409 DEBUG(0,("smbd_accept_connection: sys_fork() failed: %s\n",
410 strerror(errno)));
411 }
412
413 /* The parent doesn't need this socket */
414 close(smbd_server_fd());
415
416 /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
417 Clear the closed fd info out of server_fd --
418 and more importantly, out of client_fd in
419 util_sock.c, to avoid a possible
420 getpeername failure if we reopen the logs
421 and use %I in the filename.
422 */
423
424 smbd_set_server_fd(-1);
425
426 if (pid != 0) {
427 add_child_pid(pid);
428 }
429
430 /* Force parent to check log size after
431 * spawning child. Fix from
432 * klausr@ITAP.Physik.Uni-Stuttgart.De. The
433 * parent smbd will log to logserver.smb. It
434 * writes only two messages for each child
435 * started/finished. But each child writes,
436 * say, 50 messages also in logserver.smb,
437 * begining with the debug_count of the
438 * parent, before the child opens its own log
439 * file logserver.client. In a worst case
440 * scenario the size of logserver.smb would be
441 * checked after about 50*50=2500 messages
442 * (ca. 100kb).
443 * */
444 force_check_log_size();
445}
446
447static bool smbd_open_one_socket(struct smbd_parent_context *parent,
448 const struct sockaddr_storage *ifss,
449 uint16_t port)
450{
451 struct smbd_open_socket *s;
452
453 s = talloc(parent, struct smbd_open_socket);
454 if (!s) {
455 return false;
456 }
457
458 s->parent = parent;
459 s->fd = open_socket_in(SOCK_STREAM,
460 port,
461 parent->sockets == NULL ? 0 : 2,
462 ifss,
463 true);
464 if (s->fd == -1) {
465 DEBUG(0,("smbd_open_once_socket: open_socket_in: "
466 "%s\n", strerror(errno)));
467 TALLOC_FREE(s);
468 /*
469 * We ignore an error here, as we've done before
470 */
471 return true;
472 }
473
474 /* ready to listen */
475 set_socket_options(s->fd, "SO_KEEPALIVE");
476 set_socket_options(s->fd, lp_socket_options());
477
478 /* Set server socket to
479 * non-blocking for the accept. */
480 set_blocking(s->fd, False);
481
482 if (listen(s->fd, SMBD_LISTEN_BACKLOG) == -1) {
483 DEBUG(0,("open_sockets_smbd: listen: "
484 "%s\n", strerror(errno)));
485 close(s->fd);
486 TALLOC_FREE(s);
487 return false;
488 }
489
490 s->fde = tevent_add_fd(smbd_event_context(),
491 s,
492 s->fd, TEVENT_FD_READ,
493 smbd_accept_connection,
494 s);
495 if (!s->fde) {
496 DEBUG(0,("open_sockets_smbd: "
497 "tevent_add_fd: %s\n",
498 strerror(errno)));
499 close(s->fd);
500 TALLOC_FREE(s);
501 return false;
502 }
503 tevent_fd_set_close_fn(s->fde, smbd_open_socket_close_fn);
504
505 DLIST_ADD_END(parent->sockets, s, struct smbd_open_socket *);
506
507 return true;
508}
509
510/****************************************************************************
511 Open the socket communication.
512****************************************************************************/
513
514static bool open_sockets_smbd(struct smbd_parent_context *parent,
515 const char *smb_ports)
516{
517 int num_interfaces = iface_count();
518 int i;
519 char *ports;
520 unsigned dns_port = 0;
521
522#ifdef HAVE_ATEXIT
523 atexit(killkids);
524#endif
525
526 /* Stop zombies */
527 smbd_setup_sig_chld_handler();
528
529 /* use a reasonable default set of ports - listing on 445 and 139 */
530 if (!smb_ports) {
531 ports = lp_smb_ports();
532 if (!ports || !*ports) {
533 ports = talloc_strdup(talloc_tos(), SMB_PORTS);
534 } else {
535 ports = talloc_strdup(talloc_tos(), ports);
536 }
537 } else {
538 ports = talloc_strdup(talloc_tos(), smb_ports);
539 }
540
541 if (lp_interfaces() && lp_bind_interfaces_only()) {
542 /* We have been given an interfaces line, and been
543 told to only bind to those interfaces. Create a
544 socket per interface and bind to only these.
545 */
546
547 /* Now open a listen socket for each of the
548 interfaces. */
549 for(i = 0; i < num_interfaces; i++) {
550 const struct sockaddr_storage *ifss =
551 iface_n_sockaddr_storage(i);
552 char *tok;
553 const char *ptr;
554
555 if (ifss == NULL) {
556 DEBUG(0,("open_sockets_smbd: "
557 "interface %d has NULL IP address !\n",
558 i));
559 continue;
560 }
561
562 for (ptr=ports;
563 next_token_talloc(talloc_tos(),&ptr, &tok, " \t,");) {
564 unsigned port = atoi(tok);
565 if (port == 0 || port > 0xffff) {
566 continue;
567 }
568
569 if (!smbd_open_one_socket(parent, ifss, port)) {
570 return false;
571 }
572 }
573 }
574 } else {
575 /* Just bind to 0.0.0.0 - accept connections
576 from anywhere. */
577
578 char *tok;
579 const char *ptr;
580 const char *sock_addr = lp_socket_address();
581 char *sock_tok;
582 const char *sock_ptr;
583
584 if (strequal(sock_addr, "0.0.0.0") ||
585 strequal(sock_addr, "::")) {
586#if HAVE_IPV6
587 sock_addr = "::,0.0.0.0";
588#else
589 sock_addr = "0.0.0.0";
590#endif
591 }
592
593 for (sock_ptr=sock_addr;
594 next_token_talloc(talloc_tos(), &sock_ptr, &sock_tok, " \t,"); ) {
595 for (ptr=ports; next_token_talloc(talloc_tos(), &ptr, &tok, " \t,"); ) {
596 struct sockaddr_storage ss;
597
598 unsigned port = atoi(tok);
599 if (port == 0 || port > 0xffff) {
600 continue;
601 }
602
603 /* Keep the first port for mDNS service
604 * registration.
605 */
606 if (dns_port == 0) {
607 dns_port = port;
608 }
609
610 /* open an incoming socket */
611 if (!interpret_string_addr(&ss, sock_tok,
612 AI_NUMERICHOST|AI_PASSIVE)) {
613 continue;
614 }
615
616 if (!smbd_open_one_socket(parent, &ss, port)) {
617 return false;
618 }
619 }
620 }
621 }
622
623 if (parent->sockets == NULL) {
624 DEBUG(0,("open_sockets_smbd: No "
625 "sockets available to bind to.\n"));
626 return false;
627 }
628
629 /* Setup the main smbd so that we can get messages. Note that
630 do this after starting listening. This is needed as when in
631 clustered mode, ctdb won't allow us to start doing database
632 operations until it has gone thru a full startup, which
633 includes checking to see that smbd is listening. */
634 claim_connection(NULL,"",
635 FLAG_MSG_GENERAL|FLAG_MSG_SMBD|FLAG_MSG_DBWRAP);
636
637 /* Listen to messages */
638
639 messaging_register(smbd_messaging_context(), NULL,
640 MSG_SMB_SAM_SYNC, msg_sam_sync);
641 messaging_register(smbd_messaging_context(), NULL,
642 MSG_SHUTDOWN, msg_exit_server);
643 messaging_register(smbd_messaging_context(), NULL,
644 MSG_SMB_FILE_RENAME, msg_file_was_renamed);
645 messaging_register(smbd_messaging_context(), NULL,
646 MSG_SMB_CONF_UPDATED, smb_conf_updated);
647 messaging_register(smbd_messaging_context(), NULL,
648 MSG_SMB_STAT_CACHE_DELETE, smb_stat_cache_delete);
649 messaging_register(smbd_messaging_context(), NULL,
650 MSG_DEBUG, smbd_msg_debug);
651 brl_register_msgs(smbd_messaging_context());
652
653#ifdef CLUSTER_SUPPORT
654 if (lp_clustering()) {
655 ctdbd_register_reconfigure(messaging_ctdbd_connection());
656 }
657#endif
658
659#ifdef DEVELOPER
660 messaging_register(smbd_messaging_context(), NULL,
661 MSG_SMB_INJECT_FAULT, msg_inject_fault);
662#endif
663
664 if (dns_port != 0) {
665#ifdef WITH_DNSSD_SUPPORT
666 smbd_setup_mdns_registration(smbd_event_context(),
667 parent, dns_port);
668#endif
669#ifdef WITH_AVAHI_SUPPORT
670 void *avahi_conn;
671
672 avahi_conn = avahi_start_register(
673 smbd_event_context(), smbd_event_context(), dns_port);
674 if (avahi_conn == NULL) {
675 DEBUG(10, ("avahi_start_register failed\n"));
676 }
677#endif
678 }
679
680 return true;
681}
682
683static void smbd_parent_loop(struct smbd_parent_context *parent)
684{
685 /* now accept incoming connections - forking a new process
686 for each incoming connection */
687 DEBUG(2,("waiting for connections\n"));
688 while (1) {
689 int ret;
690 TALLOC_CTX *frame = talloc_stackframe();
691
692 ret = tevent_loop_once(smbd_event_context());
693 if (ret != 0) {
694 exit_server_cleanly("tevent_loop_once() error");
695 }
696
697 TALLOC_FREE(frame);
698 } /* end while 1 */
699
700/* NOTREACHED return True; */
701}
702
703/****************************************************************************
704 Reload printers
705**************************************************************************/
706void reload_printers(void)
707{
708 int snum;
709 int n_services = lp_numservices();
710 int pnum = lp_servicenumber(PRINTERS_NAME);
711 const char *pname;
712
713 pcap_cache_reload();
714
715 /* remove stale printers */
716 for (snum = 0; snum < n_services; snum++) {
717 /* avoid removing PRINTERS_NAME or non-autoloaded printers */
718 if (snum == pnum || !(lp_snum_ok(snum) && lp_print_ok(snum) &&
719 lp_autoloaded(snum)))
720 continue;
721
722 pname = lp_printername(snum);
723 if (!pcap_printername_ok(pname)) {
724 DEBUG(3, ("removing stale printer %s\n", pname));
725
726 if (is_printer_published(NULL, snum, NULL))
727 nt_printer_publish(NULL, snum, DSPRINT_UNPUBLISH);
728 del_a_printer(pname);
729 lp_killservice(snum);
730 }
731 }
732
733 load_printers();
734}
735
736/****************************************************************************
737 Reload the services file.
738**************************************************************************/
739
740bool reload_services(bool test)
741{
742 bool ret;
743
744 if (lp_loaded()) {
745 char *fname = lp_configfile();
746 if (file_exist(fname) &&
747 !strcsequal(fname, get_dyn_CONFIGFILE())) {
748 set_dyn_CONFIGFILE(fname);
749 test = False;
750 }
751 }
752
753 reopen_logs();
754
755 if (test && !lp_file_list_changed())
756 return(True);
757
758 lp_killunused(conn_snum_used);
759
760 ret = lp_load(get_dyn_CONFIGFILE(), False, False, True, True);
761
762 reload_printers();
763
764 /* perhaps the config filename is now set */
765 if (!test)
766 reload_services(True);
767
768 reopen_logs();
769
770 load_interfaces();
771
772 if (smbd_server_fd() != -1) {
773 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
774 set_socket_options(smbd_server_fd(), lp_socket_options());
775 }
776
777 mangle_reset_cache();
778 reset_stat_cache();
779
780 /* this forces service parameters to be flushed */
781 set_current_service(NULL,0,True);
782
783 return(ret);
784}
785
786/****************************************************************************
787 Exit the server.
788****************************************************************************/
789
790/* Reasons for shutting down a server process. */
791enum server_exit_reason { SERVER_EXIT_NORMAL, SERVER_EXIT_ABNORMAL };
792
793static void exit_server_common(enum server_exit_reason how,
794 const char *const reason) _NORETURN_;
795
796static void exit_server_common(enum server_exit_reason how,
797 const char *const reason)
798{
799 bool had_open_conn = false;
800 struct smbd_server_connection *sconn = smbd_server_conn;
801
802 if (!exit_firsttime)
803 exit(0);
804 exit_firsttime = false;
805
806 change_to_root_user();
807
808 if (sconn && sconn->smb1.negprot.auth_context) {
809 struct auth_context *a = sconn->smb1.negprot.auth_context;
810 a->free(&sconn->smb1.negprot.auth_context);
811 }
812
813 if (sconn) {
814 had_open_conn = conn_close_all(sconn);
815 invalidate_all_vuids(sconn);
816 }
817
818 /* 3 second timeout. */
819 print_notify_send_messages(smbd_messaging_context(), 3);
820
821 /* delete our entry in the connections database. */
822 yield_connection(NULL,"");
823
824#ifdef WITH_DFS
825 if (dcelogin_atmost_once) {
826 dfs_unlogin();
827 }
828#endif
829
830#ifdef USE_DMAPI
831 /* Destroy Samba DMAPI session only if we are master smbd process */
832 if (am_parent) {
833 if (!dmapi_destroy_session()) {
834 DEBUG(0,("Unable to close Samba DMAPI session\n"));
835 }
836 }
837#endif
838
839 locking_end();
840 printing_end();
841
842 /*
843 * we need to force the order of freeing the following,
844 * because smbd_msg_ctx is not a talloc child of smbd_server_conn.
845 */
846 sconn = NULL;
847 TALLOC_FREE(smbd_server_conn);
848 TALLOC_FREE(smbd_msg_ctx);
849 TALLOC_FREE(smbd_event_ctx);
850
851 if (how != SERVER_EXIT_NORMAL) {
852 int oldlevel = DEBUGLEVEL;
853
854 DEBUGLEVEL = 10;
855
856 DEBUGSEP(0);
857 DEBUG(0,("Abnormal server exit: %s\n",
858 reason ? reason : "no explanation provided"));
859 DEBUGSEP(0);
860
861 log_stack_trace();
862
863 DEBUGLEVEL = oldlevel;
864 dump_core();
865
866 } else {
867 DEBUG(3,("Server exit (%s)\n",
868 (reason ? reason : "normal exit")));
869 if (am_parent) {
870 pidfile_unlink();
871 }
872 gencache_stabilize();
873 }
874
875 /* if we had any open SMB connections when we exited then we
876 need to tell the parent smbd so that it can trigger a retry
877 of any locks we may have been holding or open files we were
878 blocking */
879 if (had_open_conn) {
880 exit(1);
881 } else {
882 exit(0);
883 }
884}
885
886void exit_server(const char *const explanation)
887{
888 exit_server_common(SERVER_EXIT_ABNORMAL, explanation);
889}
890
891void exit_server_cleanly(const char *const explanation)
892{
893 exit_server_common(SERVER_EXIT_NORMAL, explanation);
894}
895
896void exit_server_fault(void)
897{
898 exit_server("critical server fault");
899}
900
901/****************************************************************************
902 Initialise connect, service and file structs.
903****************************************************************************/
904
905static bool init_structs(void )
906{
907 /*
908 * Set the machine NETBIOS name if not already
909 * set from the config file.
910 */
911
912 if (!init_names())
913 return False;
914
915 file_init();
916
917 if (!secrets_init())
918 return False;
919
920 return True;
921}
922
923/****************************************************************************
924 main program.
925****************************************************************************/
926
927/* Declare prototype for build_options() to avoid having to run it through
928 mkproto.h. Mixing $(builddir) and $(srcdir) source files in the current
929 prototype generation system is too complicated. */
930
931extern void build_options(bool screen);
932
933 int main(int argc,const char *argv[])
934{
935 /* shall I run as a daemon */
936 bool is_daemon = false;
937 bool interactive = false;
938 bool Fork = true;
939 bool no_process_group = false;
940 bool log_stdout = false;
941 char *ports = NULL;
942 char *profile_level = NULL;
943 int opt;
944 poptContext pc;
945 bool print_build_options = False;
946 enum {
947 OPT_DAEMON = 1000,
948 OPT_INTERACTIVE,
949 OPT_FORK,
950 OPT_NO_PROCESS_GROUP,
951 OPT_LOG_STDOUT
952 };
953 struct poptOption long_options[] = {
954 POPT_AUTOHELP
955 {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
956 {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)"},
957 {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools, etc.)" },
958 {"no-process-group", '\0', POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
959 {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
960 {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
961 {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
962 {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
963 POPT_COMMON_SAMBA
964 POPT_COMMON_DYNCONFIG
965 POPT_TABLEEND
966 };
967 struct smbd_parent_context *parent = NULL;
968 TALLOC_CTX *frame = talloc_stackframe(); /* Setup tos. */
969
970 smbd_init_globals();
971
972 TimeInit();
973
974#ifdef HAVE_SET_AUTH_PARAMETERS
975 set_auth_parameters(argc,argv);
976#endif
977
978 pc = poptGetContext("smbd", argc, argv, long_options, 0);
979 while((opt = poptGetNextOpt(pc)) != -1) {
980 switch (opt) {
981 case OPT_DAEMON:
982 is_daemon = true;
983 break;
984 case OPT_INTERACTIVE:
985 interactive = true;
986 break;
987 case OPT_FORK:
988 Fork = false;
989 break;
990 case OPT_NO_PROCESS_GROUP:
991 no_process_group = true;
992 break;
993 case OPT_LOG_STDOUT:
994 log_stdout = true;
995 break;
996 case 'b':
997 print_build_options = True;
998 break;
999 default:
1000 d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1001 poptBadOption(pc, 0), poptStrerror(opt));
1002 poptPrintUsage(pc, stderr, 0);
1003 exit(1);
1004 }
1005 }
1006 poptFreeContext(pc);
1007
1008 if (interactive) {
1009 Fork = False;
1010 log_stdout = True;
1011 }
1012
1013 setup_logging(argv[0],log_stdout);
1014
1015 if (print_build_options) {
1016 build_options(True); /* Display output to screen as well as debug */
1017 exit(0);
1018 }
1019
1020 load_case_tables();
1021
1022#ifdef HAVE_SETLUID
1023 /* needed for SecureWare on SCO */
1024 setluid(0);
1025#endif
1026
1027 sec_init();
1028
1029 set_remote_machine_name("smbd", False);
1030
1031 if (interactive && (DEBUGLEVEL >= 9)) {
1032 talloc_enable_leak_report();
1033 }
1034
1035 if (log_stdout && Fork) {
1036 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
1037 exit(1);
1038 }
1039
1040 /* we want to re-seed early to prevent time delays causing
1041 client problems at a later date. (tridge) */
1042 generate_random_buffer(NULL, 0);
1043
1044 /* make absolutely sure we run as root - to handle cases where people
1045 are crazy enough to have it setuid */
1046
1047 gain_root_privilege();
1048 gain_root_group_privilege();
1049
1050 /*
1051 * Ensure we have CAP_KILL capability set on Linux,
1052 * where we need this to communicate with threads.
1053 * This is inherited by new threads, but not by new
1054 * processes across exec().
1055 */
1056 set_effective_capability(KILL_CAPABILITY);
1057
1058 fault_setup((void (*)(void *))exit_server_fault);
1059 dump_core_setup("smbd");
1060
1061 /* we are never interested in SIGPIPE */
1062 BlockSignals(True,SIGPIPE);
1063
1064#if defined(SIGFPE)
1065 /* we are never interested in SIGFPE */
1066 BlockSignals(True,SIGFPE);
1067#endif
1068
1069#if defined(SIGUSR2)
1070 /* We are no longer interested in USR2 */
1071 BlockSignals(True,SIGUSR2);
1072#endif
1073
1074 /* POSIX demands that signals are inherited. If the invoking process has
1075 * these signals masked, we will have problems, as we won't recieve them. */
1076 BlockSignals(False, SIGHUP);
1077 BlockSignals(False, SIGUSR1);
1078 BlockSignals(False, SIGTERM);
1079
1080 /* Ensure we leave no zombies until we
1081 * correctly set up child handling below. */
1082
1083 CatchChild();
1084
1085 /* we want total control over the permissions on created files,
1086 so set our umask to 0 */
1087 umask(0);
1088
1089 init_sec_ctx();
1090
1091 reopen_logs();
1092
1093 DEBUG(0,("smbd version %s started.\n", samba_version_string()));
1094 DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1095
1096 DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
1097 (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
1098
1099 /* Output the build options to the debug log */
1100 build_options(False);
1101
1102 if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
1103 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
1104 exit(1);
1105 }
1106
1107 if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1108 DEBUG(0, ("error opening config file\n"));
1109 exit(1);
1110 }
1111
1112 if (smbd_messaging_context() == NULL)
1113 exit(1);
1114
1115 if (!reload_services(False))
1116 return(-1);
1117
1118 init_structs();
1119
1120#ifdef WITH_PROFILE
1121 if (!profile_setup(smbd_messaging_context(), False)) {
1122 DEBUG(0,("ERROR: failed to setup profiling\n"));
1123 return -1;
1124 }
1125 if (profile_level != NULL) {
1126 int pl = atoi(profile_level);
1127 struct server_id src;
1128
1129 DEBUG(1, ("setting profiling level: %s\n",profile_level));
1130 src.pid = getpid();
1131 set_profile_level(pl, src);
1132 }
1133#endif
1134
1135 DEBUG(3,( "loaded services\n"));
1136
1137 if (!is_daemon && !is_a_socket(0)) {
1138 if (!interactive)
1139 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
1140
1141 /*
1142 * Setting is_daemon here prevents us from eventually calling
1143 * the open_sockets_inetd()
1144 */
1145
1146 is_daemon = True;
1147 }
1148
1149 if (is_daemon && !interactive) {
1150 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1151 become_daemon(Fork, no_process_group);
1152 }
1153
1154#if HAVE_SETPGID
1155 /*
1156 * If we're interactive we want to set our own process group for
1157 * signal management.
1158 */
1159 if (interactive && !no_process_group)
1160 setpgid( (pid_t)0, (pid_t)0);
1161#endif
1162
1163 if (!directory_exist(lp_lockdir()))
1164 mkdir(lp_lockdir(), 0755);
1165
1166 if (is_daemon)
1167 pidfile_create("smbd");
1168
1169 if (!NT_STATUS_IS_OK(reinit_after_fork(smbd_messaging_context(),
1170 smbd_event_context(), false))) {
1171 DEBUG(0,("reinit_after_fork() failed\n"));
1172 exit(1);
1173 }
1174
1175 smbd_setup_sig_term_handler();
1176 smbd_setup_sig_hup_handler();
1177
1178 /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1179
1180 if (smbd_memcache() == NULL) {
1181 exit(1);
1182 }
1183
1184 memcache_set_global(smbd_memcache());
1185
1186 /* Initialise the password backed before the global_sam_sid
1187 to ensure that we fetch from ldap before we make a domain sid up */
1188
1189 if(!initialize_password_db(False, smbd_event_context()))
1190 exit(1);
1191
1192 if (!secrets_init()) {
1193 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1194 exit(1);
1195 }
1196
1197 if(!get_global_sam_sid()) {
1198 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1199 exit(1);
1200 }
1201
1202 if (!session_init())
1203 exit(1);
1204
1205 if (!connections_init(True))
1206 exit(1);
1207
1208 if (!locking_init())
1209 exit(1);
1210
1211 namecache_enable();
1212
1213 if (!W_ERROR_IS_OK(registry_init_full()))
1214 exit(1);
1215
1216#if 0
1217 if (!init_svcctl_db())
1218 exit(1);
1219#endif
1220
1221 if (!print_backend_init(smbd_messaging_context()))
1222 exit(1);
1223
1224 if (!init_guest_info()) {
1225 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1226 return -1;
1227 }
1228
1229 /* Open the share_info.tdb here, so we don't have to open
1230 after the fork on every single connection. This is a small
1231 performance improvment and reduces the total number of system
1232 fds used. */
1233 if (!share_info_db_init()) {
1234 DEBUG(0,("ERROR: failed to load share info db.\n"));
1235 exit(1);
1236 }
1237
1238 /* only start the background queue daemon if we are
1239 running as a daemon -- bad things will happen if
1240 smbd is launched via inetd and we fork a copy of
1241 ourselves here */
1242
1243 if (is_daemon && !interactive
1244 && lp_parm_bool(-1, "smbd", "backgroundqueue", true)) {
1245 start_background_queue();
1246 }
1247
1248 if (!is_daemon) {
1249 /* inetd mode */
1250 TALLOC_FREE(frame);
1251
1252 /* Started from inetd. fd 0 is the socket. */
1253 /* We will abort gracefully when the client or remote system
1254 goes away */
1255 smbd_set_server_fd(dup(0));
1256
1257 /* close our standard file descriptors */
1258 close_low_fds(False); /* Don't close stderr */
1259
1260#ifdef HAVE_ATEXIT
1261 atexit(killkids);
1262#endif
1263
1264 /* Stop zombies */
1265 smbd_setup_sig_chld_handler();
1266
1267 smbd_process();
1268
1269 exit_server_cleanly(NULL);
1270 return(0);
1271 }
1272
1273 parent = talloc_zero(smbd_event_context(), struct smbd_parent_context);
1274 if (!parent) {
1275 exit_server("talloc(struct smbd_parent_context) failed");
1276 }
1277 parent->interactive = interactive;
1278
1279 if (!open_sockets_smbd(parent, ports))
1280 exit_server("open_sockets_smbd() failed");
1281
1282 TALLOC_FREE(frame);
1283
1284 smbd_parent_loop(parent);
1285
1286 exit_server_cleanly(NULL);
1287 return(0);
1288}
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