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Fix the logic bug that caused us to run into kernel oplocks on an open for a stream...
[Samba.git] / source / smbd / server.c
blob176cd5f973c84b6bdd9824e531b4dcf9e5044cca
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
26 static_decl_rpc;
27
28 static int am_parent = 1;
29
30 extern struct auth_context *negprot_global_auth_context;
31 extern SIG_ATOMIC_T got_sig_term;
32 extern SIG_ATOMIC_T reload_after_sighup;
33 static SIG_ATOMIC_T got_sig_cld;
34
35 #ifdef WITH_DFS
36 extern int dcelogin_atmost_once;
37 #endif /* WITH_DFS */
38
39 /* really we should have a top level context structure that has the
40 client file descriptor as an element. That would require a major rewrite :(
41
42 the following 2 functions are an alternative - they make the file
43 descriptor private to smbd
44 */
45 static int server_fd = -1;
46
47 int smbd_server_fd(void)
48 {
49 return server_fd;
50 }
51
52 static void smbd_set_server_fd(int fd)
53 {
54 server_fd = fd;
55 }
56
57 int get_client_fd(void)
58 {
59 return server_fd;
60 }
61
62 int client_get_tcp_info(struct sockaddr_in *server, struct sockaddr_in *client)
63 {
64 socklen_t length;
65 if (server_fd == -1) {
66 return -1;
67 }
68 length = sizeof(*server);
69 if (getsockname(server_fd, (struct sockaddr *)server, &length) != 0) {
70 return -1;
71 }
72 length = sizeof(*client);
73 if (getpeername(server_fd, (struct sockaddr *)client, &length) != 0) {
74 return -1;
75 }
76 return 0;
77 }
78
79 struct event_context *smbd_event_context(void)
80 {
81 static struct event_context *ctx;
82
83 if (!ctx && !(ctx = event_context_init(NULL))) {
84 smb_panic("Could not init smbd event context");
85 }
86 return ctx;
87 }
88
89 struct messaging_context *smbd_messaging_context(void)
90 {
91 static struct messaging_context *ctx;
92
93 if (!ctx && !(ctx = messaging_init(NULL, server_id_self(),
94 smbd_event_context()))) {
95 smb_panic("Could not init smbd messaging context");
96 }
97 return ctx;
98 }
99
100 struct memcache *smbd_memcache(void)
101 {
102 static struct memcache *cache;
103
104 if (!cache
105 && !(cache = memcache_init(NULL,
106 lp_max_stat_cache_size()*1024))) {
107
108 smb_panic("Could not init smbd memcache");
109 }
110 return cache;
111 }
112
113 /*******************************************************************
114 What to do when smb.conf is updated.
115 ********************************************************************/
116
117 static void smb_conf_updated(struct messaging_context *msg,
118 void *private_data,
119 uint32_t msg_type,
120 struct server_id server_id,
121 DATA_BLOB *data)
122 {
123 DEBUG(10,("smb_conf_updated: Got message saying smb.conf was "
124 "updated. Reloading.\n"));
125 reload_services(False);
126 }
127
128
129 /*******************************************************************
130 Delete a statcache entry.
131 ********************************************************************/
132
133 static void smb_stat_cache_delete(struct messaging_context *msg,
134 void *private_data,
135 uint32_t msg_tnype,
136 struct server_id server_id,
137 DATA_BLOB *data)
138 {
139 const char *name = (const char *)data->data;
140 DEBUG(10,("smb_stat_cache_delete: delete name %s\n", name));
141 stat_cache_delete(name);
142 }
143
144 /****************************************************************************
145 Terminate signal.
146 ****************************************************************************/
147
148 static void sig_term(void)
149 {
150 got_sig_term = 1;
151 sys_select_signal(SIGTERM);
152 }
153
154 /****************************************************************************
155 Catch a sighup.
156 ****************************************************************************/
157
158 static void sig_hup(int sig)
159 {
160 reload_after_sighup = 1;
161 sys_select_signal(SIGHUP);
162 }
163
164 /****************************************************************************
165 Catch a sigcld
166 ****************************************************************************/
167 static void sig_cld(int sig)
168 {
169 got_sig_cld = 1;
170 sys_select_signal(SIGCLD);
171 }
172
173 /****************************************************************************
174 Send a SIGTERM to our process group.
175 *****************************************************************************/
176
177 static void killkids(void)
178 {
179 if(am_parent) kill(0,SIGTERM);
180 }
181
182 /****************************************************************************
183 Process a sam sync message - not sure whether to do this here or
184 somewhere else.
185 ****************************************************************************/
186
187 static void msg_sam_sync(struct messaging_context *msg,
188 void *private_data,
189 uint32_t msg_type,
190 struct server_id server_id,
191 DATA_BLOB *data)
192 {
193 DEBUG(10, ("** sam sync message received, ignoring\n"));
194 }
195
196
197 /****************************************************************************
198 Open the socket communication - inetd.
199 ****************************************************************************/
200
201 static bool open_sockets_inetd(void)
202 {
203 /* Started from inetd. fd 0 is the socket. */
204 /* We will abort gracefully when the client or remote system
205 goes away */
206 smbd_set_server_fd(dup(0));
207
208 /* close our standard file descriptors */
209 close_low_fds(False); /* Don't close stderr */
210
211 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
212 set_socket_options(smbd_server_fd(), lp_socket_options());
213
214 return True;
215 }
216
217 static void msg_exit_server(struct messaging_context *msg,
218 void *private_data,
219 uint32_t msg_type,
220 struct server_id server_id,
221 DATA_BLOB *data)
222 {
223 DEBUG(3, ("got a SHUTDOWN message\n"));
224 exit_server_cleanly(NULL);
225 }
226
227 #ifdef DEVELOPER
228 static void msg_inject_fault(struct messaging_context *msg,
229 void *private_data,
230 uint32_t msg_type,
231 struct server_id src,
232 DATA_BLOB *data)
233 {
234 int sig;
235
236 if (data->length != sizeof(sig)) {
237
238 DEBUG(0, ("Process %s sent bogus signal injection request\n",
239 procid_str_static(&src)));
240 return;
241 }
242
243 sig = *(int *)data->data;
244 if (sig == -1) {
245 exit_server("internal error injected");
246 return;
247 }
248
249 #if HAVE_STRSIGNAL
250 DEBUG(0, ("Process %s requested injection of signal %d (%s)\n",
251 procid_str_static(&src), sig, strsignal(sig)));
252 #else
253 DEBUG(0, ("Process %s requested injection of signal %d\n",
254 procid_str_static(&src), sig));
255 #endif
256
257 kill(sys_getpid(), sig);
258 }
259 #endif /* DEVELOPER */
260
261 struct child_pid {
262 struct child_pid *prev, *next;
263 pid_t pid;
264 };
265
266 static struct child_pid *children;
267 static int num_children;
268
269 static void add_child_pid(pid_t pid)
270 {
271 struct child_pid *child;
272
273 if (lp_max_smbd_processes() == 0) {
274 /* Don't bother with the child list if we don't care anyway */
275 return;
276 }
277
278 child = SMB_MALLOC_P(struct child_pid);
279 if (child == NULL) {
280 DEBUG(0, ("Could not add child struct -- malloc failed\n"));
281 return;
282 }
283 child->pid = pid;
284 DLIST_ADD(children, child);
285 num_children += 1;
286 }
287
288 static void remove_child_pid(pid_t pid, bool unclean_shutdown)
289 {
290 struct child_pid *child;
291
292 if (unclean_shutdown) {
293 /* a child terminated uncleanly so tickle all processes to see
294 if they can grab any of the pending locks
295 */
296 messaging_send_buf(smbd_messaging_context(), procid_self(),
297 MSG_SMB_BRL_VALIDATE, NULL, 0);
298 message_send_all(smbd_messaging_context(),
299 MSG_SMB_UNLOCK, NULL, 0, NULL);
300 }
301
302 if (lp_max_smbd_processes() == 0) {
303 /* Don't bother with the child list if we don't care anyway */
304 return;
305 }
306
307 for (child = children; child != NULL; child = child->next) {
308 if (child->pid == pid) {
309 struct child_pid *tmp = child;
310 DLIST_REMOVE(children, child);
311 SAFE_FREE(tmp);
312 num_children -= 1;
313 return;
314 }
315 }
316
317 DEBUG(0, ("Could not find child %d -- ignoring\n", (int)pid));
318 }
319
320 /****************************************************************************
321 Have we reached the process limit ?
322 ****************************************************************************/
323
324 static bool allowable_number_of_smbd_processes(void)
325 {
326 int max_processes = lp_max_smbd_processes();
327
328 if (!max_processes)
329 return True;
330
331 return num_children < max_processes;
332 }
333
334 /****************************************************************************
335 Open the socket communication.
336 ****************************************************************************/
337
338 static bool open_sockets_smbd(bool is_daemon, bool interactive, const char *smb_ports)
339 {
340 int num_interfaces = iface_count();
341 int num_sockets = 0;
342 int fd_listenset[FD_SETSIZE];
343 fd_set listen_set;
344 int s;
345 int maxfd = 0;
346 int i;
347 char *ports;
348 struct dns_reg_state * dns_reg = NULL;
349 unsigned dns_port = 0;
350
351 if (!is_daemon) {
352 return open_sockets_inetd();
353 }
354
355 #ifdef HAVE_ATEXIT
356 {
357 static int atexit_set;
358 if(atexit_set == 0) {
359 atexit_set=1;
360 atexit(killkids);
361 }
362 }
363 #endif
364
365 /* Stop zombies */
366 CatchSignal(SIGCLD, sig_cld);
367
368 FD_ZERO(&listen_set);
369
370 /* use a reasonable default set of ports - listing on 445 and 139 */
371 if (!smb_ports) {
372 ports = lp_smb_ports();
373 if (!ports || !*ports) {
374 ports = smb_xstrdup(SMB_PORTS);
375 } else {
376 ports = smb_xstrdup(ports);
377 }
378 } else {
379 ports = smb_xstrdup(smb_ports);
380 }
381
382 if (lp_interfaces() && lp_bind_interfaces_only()) {
383 /* We have been given an interfaces line, and been
384 told to only bind to those interfaces. Create a
385 socket per interface and bind to only these.
386 */
387
388 /* Now open a listen socket for each of the
389 interfaces. */
390 for(i = 0; i < num_interfaces; i++) {
391 TALLOC_CTX *frame = NULL;
392 const struct sockaddr_storage *ifss =
393 iface_n_sockaddr_storage(i);
394 char *tok;
395 const char *ptr;
396
397 if (ifss == NULL) {
398 DEBUG(0,("open_sockets_smbd: "
399 "interface %d has NULL IP address !\n",
400 i));
401 continue;
402 }
403
404 frame = talloc_stackframe();
405 for (ptr=ports;
406 next_token_talloc(frame,&ptr, &tok, " \t,");) {
407 unsigned port = atoi(tok);
408 if (port == 0 || port > 0xffff) {
409 continue;
410 }
411
412 /* Keep the first port for mDNS service
413 * registration.
414 */
415 if (dns_port == 0) {
416 dns_port = port;
417 }
418
419 s = fd_listenset[num_sockets] =
420 open_socket_in(SOCK_STREAM,
421 port,
422 num_sockets == 0 ? 0 : 2,
423 ifss,
424 true);
425 if(s == -1) {
426 continue;
427 }
428
429 /* ready to listen */
430 set_socket_options(s,"SO_KEEPALIVE");
431 set_socket_options(s,lp_socket_options());
432
433 /* Set server socket to
434 * non-blocking for the accept. */
435 set_blocking(s,False);
436
437 if (listen(s, SMBD_LISTEN_BACKLOG) == -1) {
438 DEBUG(0,("open_sockets_smbd: listen: "
439 "%s\n", strerror(errno)));
440 close(s);
441 TALLOC_FREE(frame);
442 return False;
443 }
444 FD_SET(s,&listen_set);
445 maxfd = MAX( maxfd, s);
446
447 num_sockets++;
448 if (num_sockets >= FD_SETSIZE) {
449 DEBUG(0,("open_sockets_smbd: Too "
450 "many sockets to bind to\n"));
451 TALLOC_FREE(frame);
452 return False;
453 }
454 }
455 TALLOC_FREE(frame);
456 }
457 } else {
458 /* Just bind to 0.0.0.0 - accept connections
459 from anywhere. */
460
461 TALLOC_CTX *frame = talloc_stackframe();
462 char *tok;
463 const char *ptr;
464 const char *sock_addr = lp_socket_address();
465 char *sock_tok;
466 const char *sock_ptr;
467
468 if (sock_addr[0] == '\0' ||
469 strequal(sock_addr, "0.0.0.0") ||
470 strequal(sock_addr, "::")) {
471 #if HAVE_IPV6
472 sock_addr = "::,0.0.0.0";
473 #else
474 sock_addr = "0.0.0.0";
475 #endif
476 }
477
478 for (sock_ptr=sock_addr;
479 next_token_talloc(frame, &sock_ptr, &sock_tok, " \t,"); ) {
480 for (ptr=ports; next_token_talloc(frame, &ptr, &tok, " \t,"); ) {
481 struct sockaddr_storage ss;
482
483 unsigned port = atoi(tok);
484 if (port == 0 || port > 0xffff) {
485 continue;
486 }
487
488 /* Keep the first port for mDNS service
489 * registration.
490 */
491 if (dns_port == 0) {
492 dns_port = port;
493 }
494
495 /* open an incoming socket */
496 if (!interpret_string_addr(&ss, sock_tok,
497 AI_NUMERICHOST|AI_PASSIVE)) {
498 continue;
499 }
500
501 s = open_socket_in(SOCK_STREAM,
502 port,
503 num_sockets == 0 ? 0 : 2,
504 &ss,
505 true);
506 if (s == -1) {
507 continue;
508 }
509
510 /* ready to listen */
511 set_socket_options(s,"SO_KEEPALIVE");
512 set_socket_options(s,lp_socket_options());
513
514 /* Set server socket to non-blocking
515 * for the accept. */
516 set_blocking(s,False);
517
518 if (listen(s, SMBD_LISTEN_BACKLOG) == -1) {
519 DEBUG(0,("open_sockets_smbd: "
520 "listen: %s\n",
521 strerror(errno)));
522 close(s);
523 TALLOC_FREE(frame);
524 return False;
525 }
526
527 fd_listenset[num_sockets] = s;
528 FD_SET(s,&listen_set);
529 maxfd = MAX( maxfd, s);
530
531 num_sockets++;
532
533 if (num_sockets >= FD_SETSIZE) {
534 DEBUG(0,("open_sockets_smbd: Too "
535 "many sockets to bind to\n"));
536 TALLOC_FREE(frame);
537 return False;
538 }
539 }
540 }
541 TALLOC_FREE(frame);
542 }
543
544 SAFE_FREE(ports);
545
546 if (num_sockets == 0) {
547 DEBUG(0,("open_sockets_smbd: No "
548 "sockets available to bind to.\n"));
549 return false;
550 }
551
552 /* Setup the main smbd so that we can get messages. Note that
553 do this after starting listening. This is needed as when in
554 clustered mode, ctdb won't allow us to start doing database
555 operations until it has gone thru a full startup, which
556 includes checking to see that smbd is listening. */
557 claim_connection(NULL,"",
558 FLAG_MSG_GENERAL|FLAG_MSG_SMBD|FLAG_MSG_DBWRAP);
559
560 /* Listen to messages */
561
562 messaging_register(smbd_messaging_context(), NULL,
563 MSG_SMB_SAM_SYNC, msg_sam_sync);
564 messaging_register(smbd_messaging_context(), NULL,
565 MSG_SHUTDOWN, msg_exit_server);
566 messaging_register(smbd_messaging_context(), NULL,
567 MSG_SMB_FILE_RENAME, msg_file_was_renamed);
568 messaging_register(smbd_messaging_context(), NULL,
569 MSG_SMB_CONF_UPDATED, smb_conf_updated);
570 messaging_register(smbd_messaging_context(), NULL,
571 MSG_SMB_STAT_CACHE_DELETE, smb_stat_cache_delete);
572 brl_register_msgs(smbd_messaging_context());
573
574 #ifdef DEVELOPER
575 messaging_register(smbd_messaging_context(), NULL,
576 MSG_SMB_INJECT_FAULT, msg_inject_fault);
577 #endif
578
579 /* now accept incoming connections - forking a new process
580 for each incoming connection */
581 DEBUG(2,("waiting for a connection\n"));
582 while (1) {
583 struct timeval now, idle_timeout;
584 fd_set r_fds, w_fds;
585 int num;
586
587 /* Ensure we respond to PING and DEBUG messages from the main smbd. */
588 message_dispatch(smbd_messaging_context());
589
590 if (got_sig_cld) {
591 pid_t pid;
592 int status;
593
594 got_sig_cld = False;
595
596 while ((pid = sys_waitpid(-1, &status, WNOHANG)) > 0) {
597 bool unclean_shutdown = False;
598
599 /* If the child terminated normally, assume
600 it was an unclean shutdown unless the
601 status is 0
602 */
603 if (WIFEXITED(status)) {
604 unclean_shutdown = WEXITSTATUS(status);
605 }
606 /* If the child terminated due to a signal
607 we always assume it was unclean.
608 */
609 if (WIFSIGNALED(status)) {
610 unclean_shutdown = True;
611 }
612 remove_child_pid(pid, unclean_shutdown);
613 }
614 }
615
616 idle_timeout = timeval_zero();
617
618 memcpy((char *)&r_fds, (char *)&listen_set,
619 sizeof(listen_set));
620 FD_ZERO(&w_fds);
621 GetTimeOfDay(&now);
622
623 /* Kick off our mDNS registration. */
624 if (dns_port != 0) {
625 dns_register_smbd(&dns_reg, dns_port, &maxfd,
626 &r_fds, &idle_timeout);
627 }
628
629 event_add_to_select_args(smbd_event_context(), &now,
630 &r_fds, &w_fds, &idle_timeout,
631 &maxfd);
632
633 num = sys_select(maxfd+1,&r_fds,&w_fds,NULL,
634 timeval_is_zero(&idle_timeout) ?
635 NULL : &idle_timeout);
636
637 if (num == -1 && errno == EINTR) {
638 if (got_sig_term) {
639 exit_server_cleanly(NULL);
640 }
641
642 /* check for sighup processing */
643 if (reload_after_sighup) {
644 change_to_root_user();
645 DEBUG(1,("Reloading services after SIGHUP\n"));
646 reload_services(False);
647 reload_after_sighup = 0;
648 }
649
650 continue;
651 }
652
653
654 /* If the idle timeout fired and we don't have any connected
655 * users, exit gracefully. We should be running under a process
656 * controller that will restart us if necessry.
657 */
658 if (num == 0 && count_all_current_connections() == 0) {
659 exit_server_cleanly("idle timeout");
660 }
661
662 /* process pending nDNS responses */
663 if (dns_register_smbd_reply(dns_reg, &r_fds, &idle_timeout)) {
664 --num;
665 }
666
667 if (run_events(smbd_event_context(), num, &r_fds, &w_fds)) {
668 continue;
669 }
670
671 /* check if we need to reload services */
672 check_reload(time(NULL));
673
674 /* Find the sockets that are read-ready -
675 accept on these. */
676 for( ; num > 0; num--) {
677 struct sockaddr addr;
678 socklen_t in_addrlen = sizeof(addr);
679 pid_t child = 0;
680
681 s = -1;
682 for(i = 0; i < num_sockets; i++) {
683 if(FD_ISSET(fd_listenset[i],&r_fds)) {
684 s = fd_listenset[i];
685 /* Clear this so we don't look
686 at it again. */
687 FD_CLR(fd_listenset[i],&r_fds);
688 break;
689 }
690 }
691
692 smbd_set_server_fd(accept(s,&addr,&in_addrlen));
693
694 if (smbd_server_fd() == -1 && errno == EINTR)
695 continue;
696
697 if (smbd_server_fd() == -1) {
698 DEBUG(2,("open_sockets_smbd: accept: %s\n",
699 strerror(errno)));
700 continue;
701 }
702
703 /* Ensure child is set to blocking mode */
704 set_blocking(smbd_server_fd(),True);
705
706 if (smbd_server_fd() != -1 && interactive)
707 return True;
708
709 if (allowable_number_of_smbd_processes() &&
710 smbd_server_fd() != -1 &&
711 ((child = sys_fork())==0)) {
712 char remaddr[INET6_ADDRSTRLEN];
713
714 /* Child code ... */
715
716 /* Stop zombies, the parent explicitly handles
717 * them, counting worker smbds. */
718 CatchChild();
719
720 /* close the listening socket(s) */
721 for(i = 0; i < num_sockets; i++)
722 close(fd_listenset[i]);
723
724 /* close our mDNS daemon handle */
725 dns_register_close(&dns_reg);
726
727 /* close our standard file
728 descriptors */
729 close_low_fds(False);
730 am_parent = 0;
731
732 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
733 set_socket_options(smbd_server_fd(),
734 lp_socket_options());
735
736 /* this is needed so that we get decent entries
737 in smbstatus for port 445 connects */
738 set_remote_machine_name(get_peer_addr(smbd_server_fd(),
739 remaddr,
740 sizeof(remaddr)),
741 false);
742
743 if (!reinit_after_fork(
744 smbd_messaging_context(), true)) {
745 DEBUG(0,("reinit_after_fork() failed\n"));
746 smb_panic("reinit_after_fork() failed");
747 }
748
749 return True;
750 }
751 /* The parent doesn't need this socket */
752 close(smbd_server_fd());
753
754 /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
755 Clear the closed fd info out of server_fd --
756 and more importantly, out of client_fd in
757 util_sock.c, to avoid a possible
758 getpeername failure if we reopen the logs
759 and use %I in the filename.
760 */
761
762 smbd_set_server_fd(-1);
763
764 if (child != 0) {
765 add_child_pid(child);
766 }
767
768 /* Force parent to check log size after
769 * spawning child. Fix from
770 * klausr@ITAP.Physik.Uni-Stuttgart.De. The
771 * parent smbd will log to logserver.smb. It
772 * writes only two messages for each child
773 * started/finished. But each child writes,
774 * say, 50 messages also in logserver.smb,
775 * begining with the debug_count of the
776 * parent, before the child opens its own log
777 * file logserver.client. In a worst case
778 * scenario the size of logserver.smb would be
779 * checked after about 50*50=2500 messages
780 * (ca. 100kb).
781 * */
782 force_check_log_size();
783
784 } /* end for num */
785 } /* end while 1 */
786
787 /* NOTREACHED return True; */
788 }
789
790 /****************************************************************************
791 Reload printers
792 **************************************************************************/
793 void reload_printers(void)
794 {
795 int snum;
796 int n_services = lp_numservices();
797 int pnum = lp_servicenumber(PRINTERS_NAME);
798 const char *pname;
799
800 pcap_cache_reload();
801
802 /* remove stale printers */
803 for (snum = 0; snum < n_services; snum++) {
804 /* avoid removing PRINTERS_NAME or non-autoloaded printers */
805 if (snum == pnum || !(lp_snum_ok(snum) && lp_print_ok(snum) &&
806 lp_autoloaded(snum)))
807 continue;
808
809 pname = lp_printername(snum);
810 if (!pcap_printername_ok(pname)) {
811 DEBUG(3, ("removing stale printer %s\n", pname));
812
813 if (is_printer_published(NULL, snum, NULL))
814 nt_printer_publish(NULL, snum, SPOOL_DS_UNPUBLISH);
815 del_a_printer(pname);
816 lp_killservice(snum);
817 }
818 }
819
820 load_printers();
821 }
822
823 /****************************************************************************
824 Reload the services file.
825 **************************************************************************/
826
827 bool reload_services(bool test)
828 {
829 bool ret;
830
831 if (lp_loaded()) {
832 char *fname = lp_configfile();
833 if (file_exist(fname, NULL) &&
834 !strcsequal(fname, get_dyn_CONFIGFILE())) {
835 set_dyn_CONFIGFILE(fname);
836 test = False;
837 }
838 }
839
840 reopen_logs();
841
842 if (test && !lp_file_list_changed())
843 return(True);
844
845 lp_killunused(conn_snum_used);
846
847 ret = lp_load(get_dyn_CONFIGFILE(), False, False, True, True);
848
849 reload_printers();
850
851 /* perhaps the config filename is now set */
852 if (!test)
853 reload_services(True);
854
855 reopen_logs();
856
857 load_interfaces();
858
859 if (smbd_server_fd() != -1) {
860 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
861 set_socket_options(smbd_server_fd(), lp_socket_options());
862 }
863
864 mangle_reset_cache();
865 reset_stat_cache();
866
867 /* this forces service parameters to be flushed */
868 set_current_service(NULL,0,True);
869
870 return(ret);
871 }
872
873 /****************************************************************************
874 Exit the server.
875 ****************************************************************************/
876
877 /* Reasons for shutting down a server process. */
878 enum server_exit_reason { SERVER_EXIT_NORMAL, SERVER_EXIT_ABNORMAL };
879
880 static void exit_server_common(enum server_exit_reason how,
881 const char *const reason) NORETURN_ATTRIBUTE;
882
883 static void exit_server_common(enum server_exit_reason how,
884 const char *const reason)
885 {
886 static int firsttime=1;
887
888 if (!firsttime)
889 exit(0);
890 firsttime = 0;
891
892 change_to_root_user();
893
894 if (negprot_global_auth_context) {
895 (negprot_global_auth_context->free)(&negprot_global_auth_context);
896 }
897
898 conn_close_all();
899
900 invalidate_all_vuids();
901
902 /* 3 second timeout. */
903 print_notify_send_messages(smbd_messaging_context(), 3);
904
905 /* delete our entry in the connections database. */
906 yield_connection(NULL,"");
907
908 respond_to_all_remaining_local_messages();
909
910 #ifdef WITH_DFS
911 if (dcelogin_atmost_once) {
912 dfs_unlogin();
913 }
914 #endif
915
916 #ifdef USE_DMAPI
917 /* Destroy Samba DMAPI session only if we are master smbd process */
918 if (am_parent) {
919 if (!dmapi_destroy_session()) {
920 DEBUG(0,("Unable to close Samba DMAPI session\n"));
921 }
922 }
923 #endif
924
925 locking_end();
926 printing_end();
927
928 if (how != SERVER_EXIT_NORMAL) {
929 int oldlevel = DEBUGLEVEL;
930
931 DEBUGLEVEL = 10;
932
933 DEBUGSEP(0);
934 DEBUG(0,("Abnormal server exit: %s\n",
935 reason ? reason : "no explanation provided"));
936 DEBUGSEP(0);
937
938 log_stack_trace();
939
940 DEBUGLEVEL = oldlevel;
941 dump_core();
942
943 } else {
944 DEBUG(3,("Server exit (%s)\n",
945 (reason ? reason : "normal exit")));
946 }
947
948 exit(0);
949 }
950
951 void exit_server(const char *const explanation)
952 {
953 exit_server_common(SERVER_EXIT_ABNORMAL, explanation);
954 }
955
956 void exit_server_cleanly(const char *const explanation)
957 {
958 exit_server_common(SERVER_EXIT_NORMAL, explanation);
959 }
960
961 void exit_server_fault(void)
962 {
963 exit_server("critical server fault");
964 }
965
966
967 /****************************************************************************
968 received when we should release a specific IP
969 ****************************************************************************/
970 static void release_ip(const char *ip, void *priv)
971 {
972 char addr[INET6_ADDRSTRLEN];
973
974 if (strcmp(client_socket_addr(get_client_fd(),addr,sizeof(addr)), ip) == 0) {
975 /* we can't afford to do a clean exit - that involves
976 database writes, which would potentially mean we
977 are still running after the failover has finished -
978 we have to get rid of this process ID straight
979 away */
980 DEBUG(0,("Got release IP message for our IP %s - exiting immediately\n",
981 ip));
982 _exit(0);
983 }
984 }
985
986 static void msg_release_ip(struct messaging_context *msg_ctx, void *private_data,
987 uint32_t msg_type, struct server_id server_id, DATA_BLOB *data)
988 {
989 release_ip((char *)data->data, NULL);
990 }
991
992 /****************************************************************************
993 Initialise connect, service and file structs.
994 ****************************************************************************/
995
996 static bool init_structs(void )
997 {
998 /*
999 * Set the machine NETBIOS name if not already
1000 * set from the config file.
1001 */
1002
1003 if (!init_names())
1004 return False;
1005
1006 conn_init();
1007
1008 file_init();
1009
1010 /* for RPC pipes */
1011 init_rpc_pipe_hnd();
1012
1013 init_dptrs();
1014
1015 if (!secrets_init())
1016 return False;
1017
1018 return True;
1019 }
1020
1021 /*
1022 * Send keepalive packets to our client
1023 */
1024 static bool keepalive_fn(const struct timeval *now, void *private_data)
1025 {
1026 if (!send_keepalive(smbd_server_fd())) {
1027 DEBUG( 2, ( "Keepalive failed - exiting.\n" ) );
1028 return False;
1029 }
1030 return True;
1031 }
1032
1033 /*
1034 * Do the recurring check if we're idle
1035 */
1036 static bool deadtime_fn(const struct timeval *now, void *private_data)
1037 {
1038 if ((conn_num_open() == 0)
1039 || (conn_idle_all(now->tv_sec))) {
1040 DEBUG( 2, ( "Closing idle connection\n" ) );
1041 messaging_send(smbd_messaging_context(), procid_self(),
1042 MSG_SHUTDOWN, &data_blob_null);
1043 return False;
1044 }
1045
1046 return True;
1047 }
1048
1049
1050 /****************************************************************************
1051 main program.
1052 ****************************************************************************/
1053
1054 /* Declare prototype for build_options() to avoid having to run it through
1055 mkproto.h. Mixing $(builddir) and $(srcdir) source files in the current
1056 prototype generation system is too complicated. */
1057
1058 extern void build_options(bool screen);
1059
1060 int main(int argc,const char *argv[])
1061 {
1062 /* shall I run as a daemon */
1063 static bool is_daemon = False;
1064 static bool interactive = False;
1065 static bool Fork = True;
1066 static bool no_process_group = False;
1067 static bool log_stdout = False;
1068 static char *ports = NULL;
1069 static char *profile_level = NULL;
1070 int opt;
1071 poptContext pc;
1072 bool print_build_options = False;
1073 enum {
1074 OPT_DAEMON = 1000,
1075 OPT_INTERACTIVE,
1076 OPT_FORK,
1077 OPT_NO_PROCESS_GROUP,
1078 OPT_LOG_STDOUT
1079 };
1080 struct poptOption long_options[] = {
1081 POPT_AUTOHELP
1082 {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1083 {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)"},
1084 {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools, etc.)" },
1085 {"no-process-group", '\0', POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1086 {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1087 {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
1088 {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
1089 {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
1090 POPT_COMMON_SAMBA
1091 POPT_COMMON_DYNCONFIG
1092 POPT_TABLEEND
1093 };
1094 TALLOC_CTX *frame = talloc_stackframe(); /* Setup tos. */
1095
1096 TimeInit();
1097
1098 db_tdb2_setup_messaging(NULL, false);
1099
1100 #ifdef HAVE_SET_AUTH_PARAMETERS
1101 set_auth_parameters(argc,argv);
1102 #endif
1103
1104 pc = poptGetContext("smbd", argc, argv, long_options, 0);
1105 while((opt = poptGetNextOpt(pc)) != -1) {
1106 switch (opt) {
1107 case OPT_DAEMON:
1108 is_daemon = true;
1109 break;
1110 case OPT_INTERACTIVE:
1111 interactive = true;
1112 break;
1113 case OPT_FORK:
1114 Fork = false;
1115 break;
1116 case OPT_NO_PROCESS_GROUP:
1117 no_process_group = true;
1118 break;
1119 case OPT_LOG_STDOUT:
1120 log_stdout = true;
1121 break;
1122 case 'b':
1123 print_build_options = True;
1124 break;
1125 default:
1126 d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1127 poptBadOption(pc, 0), poptStrerror(opt));
1128 poptPrintUsage(pc, stderr, 0);
1129 exit(1);
1130 }
1131 }
1132 poptFreeContext(pc);
1133
1134 if (interactive) {
1135 Fork = False;
1136 log_stdout = True;
1137 }
1138
1139 setup_logging(argv[0],log_stdout);
1140
1141 if (print_build_options) {
1142 build_options(True); /* Display output to screen as well as debug */
1143 exit(0);
1144 }
1145
1146 load_case_tables();
1147
1148 #ifdef HAVE_SETLUID
1149 /* needed for SecureWare on SCO */
1150 setluid(0);
1151 #endif
1152
1153 sec_init();
1154
1155 set_remote_machine_name("smbd", False);
1156
1157 if (interactive && (DEBUGLEVEL >= 9)) {
1158 talloc_enable_leak_report();
1159 }
1160
1161 if (log_stdout && Fork) {
1162 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
1163 exit(1);
1164 }
1165
1166 /* we want to re-seed early to prevent time delays causing
1167 client problems at a later date. (tridge) */
1168 generate_random_buffer(NULL, 0);
1169
1170 /* make absolutely sure we run as root - to handle cases where people
1171 are crazy enough to have it setuid */
1172
1173 gain_root_privilege();
1174 gain_root_group_privilege();
1175
1176 fault_setup((void (*)(void *))exit_server_fault);
1177 dump_core_setup("smbd");
1178
1179 CatchSignal(SIGTERM , SIGNAL_CAST sig_term);
1180 CatchSignal(SIGHUP,SIGNAL_CAST sig_hup);
1181
1182 /* we are never interested in SIGPIPE */
1183 BlockSignals(True,SIGPIPE);
1184
1185 #if defined(SIGFPE)
1186 /* we are never interested in SIGFPE */
1187 BlockSignals(True,SIGFPE);
1188 #endif
1189
1190 #if defined(SIGUSR2)
1191 /* We are no longer interested in USR2 */
1192 BlockSignals(True,SIGUSR2);
1193 #endif
1194
1195 /* POSIX demands that signals are inherited. If the invoking process has
1196 * these signals masked, we will have problems, as we won't recieve them. */
1197 BlockSignals(False, SIGHUP);
1198 BlockSignals(False, SIGUSR1);
1199 BlockSignals(False, SIGTERM);
1200
1201 /* we want total control over the permissions on created files,
1202 so set our umask to 0 */
1203 umask(0);
1204
1205 init_sec_ctx();
1206
1207 reopen_logs();
1208
1209 DEBUG(0,("smbd version %s started.\n", SAMBA_VERSION_STRING));
1210 DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1211
1212 DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
1213 (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
1214
1215 /* Output the build options to the debug log */
1216 build_options(False);
1217
1218 if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
1219 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
1220 exit(1);
1221 }
1222
1223 if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1224 DEBUG(0, ("error opening config file\n"));
1225 exit(1);
1226 }
1227
1228 if (smbd_messaging_context() == NULL)
1229 exit(1);
1230
1231 /*
1232 * Do this before reload_services.
1233 */
1234 db_tdb2_setup_messaging(smbd_messaging_context(), true);
1235
1236 if (!reload_services(False))
1237 return(-1);
1238
1239 init_structs();
1240
1241 #ifdef WITH_PROFILE
1242 if (!profile_setup(smbd_messaging_context(), False)) {
1243 DEBUG(0,("ERROR: failed to setup profiling\n"));
1244 return -1;
1245 }
1246 if (profile_level != NULL) {
1247 int pl = atoi(profile_level);
1248 struct server_id src;
1249
1250 DEBUG(1, ("setting profiling level: %s\n",profile_level));
1251 src.pid = getpid();
1252 set_profile_level(pl, src);
1253 }
1254 #endif
1255
1256 DEBUG(3,( "loaded services\n"));
1257
1258 if (!is_daemon && !is_a_socket(0)) {
1259 if (!interactive)
1260 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
1261
1262 /*
1263 * Setting is_daemon here prevents us from eventually calling
1264 * the open_sockets_inetd()
1265 */
1266
1267 is_daemon = True;
1268 }
1269
1270 if (is_daemon && !interactive) {
1271 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1272 become_daemon(Fork, no_process_group);
1273 }
1274
1275 #if HAVE_SETPGID
1276 /*
1277 * If we're interactive we want to set our own process group for
1278 * signal management.
1279 */
1280 if (interactive && !no_process_group)
1281 setpgid( (pid_t)0, (pid_t)0);
1282 #endif
1283
1284 if (!directory_exist(lp_lockdir(), NULL))
1285 mkdir(lp_lockdir(), 0755);
1286
1287 if (is_daemon)
1288 pidfile_create("smbd");
1289
1290 if (!reinit_after_fork(smbd_messaging_context(), false)) {
1291 DEBUG(0,("reinit_after_fork() failed\n"));
1292 exit(1);
1293 }
1294
1295 /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1296
1297 if (smbd_memcache() == NULL) {
1298 exit(1);
1299 }
1300
1301 memcache_set_global(smbd_memcache());
1302
1303 /* Initialise the password backed before the global_sam_sid
1304 to ensure that we fetch from ldap before we make a domain sid up */
1305
1306 if(!initialize_password_db(False, smbd_event_context()))
1307 exit(1);
1308
1309 if (!secrets_init()) {
1310 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1311 exit(1);
1312 }
1313
1314 if(!get_global_sam_sid()) {
1315 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1316 exit(1);
1317 }
1318
1319 if (!session_init())
1320 exit(1);
1321
1322 if (!connections_init(True))
1323 exit(1);
1324
1325 if (!locking_init())
1326 exit(1);
1327
1328 namecache_enable();
1329
1330 if (!W_ERROR_IS_OK(registry_init_full()))
1331 exit(1);
1332
1333 #if 0
1334 if (!init_svcctl_db())
1335 exit(1);
1336 #endif
1337
1338 if (!print_backend_init(smbd_messaging_context()))
1339 exit(1);
1340
1341 if (!init_guest_info()) {
1342 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1343 return -1;
1344 }
1345
1346 /* only start the background queue daemon if we are
1347 running as a daemon -- bad things will happen if
1348 smbd is launched via inetd and we fork a copy of
1349 ourselves here */
1350
1351 if (is_daemon && !interactive
1352 && lp_parm_bool(-1, "smbd", "backgroundqueue", true)) {
1353 start_background_queue();
1354 }
1355
1356 if (!open_sockets_smbd(is_daemon, interactive, ports))
1357 exit(1);
1358
1359 /*
1360 * everything after this point is run after the fork()
1361 */
1362
1363 static_init_rpc;
1364
1365 init_modules();
1366
1367 /* Possibly reload the services file. Only worth doing in
1368 * daemon mode. In inetd mode, we know we only just loaded this.
1369 */
1370 if (is_daemon) {
1371 reload_services(True);
1372 }
1373
1374 if (!init_account_policy()) {
1375 DEBUG(0,("Could not open account policy tdb.\n"));
1376 exit(1);
1377 }
1378
1379 if (*lp_rootdir()) {
1380 if (sys_chroot(lp_rootdir()) == 0)
1381 DEBUG(2,("Changed root to %s\n", lp_rootdir()));
1382 }
1383
1384 /* Setup oplocks */
1385 if (!init_oplocks(smbd_messaging_context()))
1386 exit(1);
1387
1388 /* Setup aio signal handler. */
1389 initialize_async_io_handler();
1390
1391 /* register our message handlers */
1392 messaging_register(smbd_messaging_context(), NULL,
1393 MSG_SMB_FORCE_TDIS, msg_force_tdis);
1394 messaging_register(smbd_messaging_context(), NULL,
1395 MSG_SMB_RELEASE_IP, msg_release_ip);
1396 messaging_register(smbd_messaging_context(), NULL,
1397 MSG_SMB_CLOSE_FILE, msg_close_file);
1398
1399 if ((lp_keepalive() != 0)
1400 && !(event_add_idle(smbd_event_context(), NULL,
1401 timeval_set(lp_keepalive(), 0),
1402 "keepalive", keepalive_fn,
1403 NULL))) {
1404 DEBUG(0, ("Could not add keepalive event\n"));
1405 exit(1);
1406 }
1407
1408 if (!(event_add_idle(smbd_event_context(), NULL,
1409 timeval_set(IDLE_CLOSED_TIMEOUT, 0),
1410 "deadtime", deadtime_fn, NULL))) {
1411 DEBUG(0, ("Could not add deadtime event\n"));
1412 exit(1);
1413 }
1414
1415 #ifdef CLUSTER_SUPPORT
1416
1417 if (lp_clustering()) {
1418 /*
1419 * We need to tell ctdb about our client's TCP
1420 * connection, so that for failover ctdbd can send
1421 * tickle acks, triggering a reconnection by the
1422 * client.
1423 */
1424
1425 struct sockaddr_in srv, clnt;
1426
1427 if (client_get_tcp_info(&srv, &clnt) == 0) {
1428
1429 NTSTATUS status;
1430
1431 status = ctdbd_register_ips(
1432 messaging_ctdbd_connection(),
1433 &srv, &clnt, release_ip, NULL);
1434
1435 if (!NT_STATUS_IS_OK(status)) {
1436 DEBUG(0, ("ctdbd_register_ips failed: %s\n",
1437 nt_errstr(status)));
1438 }
1439 } else
1440 {
1441 DEBUG(0,("Unable to get tcp info for "
1442 "CTDB_CONTROL_TCP_CLIENT: %s\n",
1443 strerror(errno)));
1444 }
1445 }
1446
1447 #endif
1448
1449 TALLOC_FREE(frame);
1450
1451 smbd_process();
1452
1453 namecache_shutdown();
1454
1455 exit_server_cleanly(NULL);
1456 return(0);
1457 }
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