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s3: piddir creation fix.
[Samba/gebeck_regimport.git] / source3 / smbd / server.c
blob22b6a7a134bef1306484a72d8a12a67c35fc756e
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 "system/filesys.h"
26 #include "popt_common.h"
27 #include "smbd/smbd.h"
28 #include "smbd/globals.h"
29 #include "registry/reg_init_full.h"
30 #include "libcli/auth/schannel.h"
31 #include "secrets.h"
32 #include "memcache.h"
33 #include "ctdbd_conn.h"
34 #include "printing/queue_process.h"
35 #include "rpc_server/rpc_service_setup.h"
36 #include "rpc_server/rpc_config.h"
37 #include "serverid.h"
38 #include "passdb.h"
39 #include "auth.h"
40 #include "messages.h"
41 #include "smbprofile.h"
42 #include "lib/id_cache.h"
43 #include "lib/param/param.h"
44
45 struct smbd_open_socket;
46 struct smbd_child_pid;
47
48 struct smbd_parent_context {
49 bool interactive;
50
51 struct tevent_context *ev_ctx;
52 struct messaging_context *msg_ctx;
53
54 /* the list of listening sockets */
55 struct smbd_open_socket *sockets;
56
57 /* the list of current child processes */
58 struct smbd_child_pid *children;
59 size_t num_children;
60
61 struct timed_event *cleanup_te;
62 };
63
64 struct smbd_open_socket {
65 struct smbd_open_socket *prev, *next;
66 struct smbd_parent_context *parent;
67 int fd;
68 struct tevent_fd *fde;
69 };
70
71 struct smbd_child_pid {
72 struct smbd_child_pid *prev, *next;
73 pid_t pid;
74 };
75
76 extern void start_epmd(struct tevent_context *ev_ctx,
77 struct messaging_context *msg_ctx);
78
79 extern void start_lsasd(struct event_context *ev_ctx,
80 struct messaging_context *msg_ctx);
81
82 #ifdef WITH_DFS
83 extern int dcelogin_atmost_once;
84 #endif /* WITH_DFS */
85
86 /*******************************************************************
87 What to do when smb.conf is updated.
88 ********************************************************************/
89
90 static void smbd_parent_conf_updated(struct messaging_context *msg,
91 void *private_data,
92 uint32_t msg_type,
93 struct server_id server_id,
94 DATA_BLOB *data)
95 {
96 struct tevent_context *ev_ctx =
97 talloc_get_type_abort(private_data, struct tevent_context);
98
99 DEBUG(10,("smbd_parent_conf_updated: Got message saying smb.conf was "
100 "updated. Reloading.\n"));
101 change_to_root_user();
102 reload_services(NULL, NULL, false);
103 printing_subsystem_update(ev_ctx, msg, false);
104 }
105
106 /*******************************************************************
107 What to do when printcap is updated.
108 ********************************************************************/
109
110 static void smb_pcap_updated(struct messaging_context *msg,
111 void *private_data,
112 uint32_t msg_type,
113 struct server_id server_id,
114 DATA_BLOB *data)
115 {
116 struct tevent_context *ev_ctx =
117 talloc_get_type_abort(private_data, struct tevent_context);
118
119 DEBUG(10,("Got message saying pcap was updated. Reloading.\n"));
120 change_to_root_user();
121 delete_and_reload_printers(ev_ctx, msg);
122 }
123
124 /*******************************************************************
125 Delete a statcache entry.
126 ********************************************************************/
127
128 static void smb_stat_cache_delete(struct messaging_context *msg,
129 void *private_data,
130 uint32_t msg_tnype,
131 struct server_id server_id,
132 DATA_BLOB *data)
133 {
134 const char *name = (const char *)data->data;
135 DEBUG(10,("smb_stat_cache_delete: delete name %s\n", name));
136 stat_cache_delete(name);
137 }
138
139 /****************************************************************************
140 Send a SIGTERM to our process group.
141 *****************************************************************************/
142
143 static void killkids(void)
144 {
145 if(am_parent) kill(0,SIGTERM);
146 }
147
148 static void msg_exit_server(struct messaging_context *msg,
149 void *private_data,
150 uint32_t msg_type,
151 struct server_id server_id,
152 DATA_BLOB *data)
153 {
154 DEBUG(3, ("got a SHUTDOWN message\n"));
155 exit_server_cleanly(NULL);
156 }
157
158 #ifdef DEVELOPER
159 static void msg_inject_fault(struct messaging_context *msg,
160 void *private_data,
161 uint32_t msg_type,
162 struct server_id src,
163 DATA_BLOB *data)
164 {
165 int sig;
166
167 if (data->length != sizeof(sig)) {
168 DEBUG(0, ("Process %s sent bogus signal injection request\n",
169 procid_str_static(&src)));
170 return;
171 }
172
173 sig = *(int *)data->data;
174 if (sig == -1) {
175 exit_server("internal error injected");
176 return;
177 }
178
179 #if HAVE_STRSIGNAL
180 DEBUG(0, ("Process %s requested injection of signal %d (%s)\n",
181 procid_str_static(&src), sig, strsignal(sig)));
182 #else
183 DEBUG(0, ("Process %s requested injection of signal %d\n",
184 procid_str_static(&src), sig));
185 #endif
186
187 kill(sys_getpid(), sig);
188 }
189 #endif /* DEVELOPER */
190
191 NTSTATUS messaging_send_to_children(struct messaging_context *msg_ctx,
192 uint32_t msg_type, DATA_BLOB* data)
193 {
194 NTSTATUS status;
195 struct smbd_parent_context *parent = am_parent;
196 struct smbd_child_pid *child;
197
198 if (parent == NULL) {
199 return NT_STATUS_INTERNAL_ERROR;
200 }
201
202 for (child = parent->children; child != NULL; child = child->next) {
203 status = messaging_send(parent->msg_ctx,
204 pid_to_procid(child->pid),
205 msg_type, data);
206 if (!NT_STATUS_IS_OK(status)) {
207 return status;
208 }
209 }
210 return NT_STATUS_OK;
211 }
212
213 /*
214 * Parent smbd process sets its own debug level first and then
215 * sends a message to all the smbd children to adjust their debug
216 * level to that of the parent.
217 */
218
219 static void smbd_msg_debug(struct messaging_context *msg_ctx,
220 void *private_data,
221 uint32_t msg_type,
222 struct server_id server_id,
223 DATA_BLOB *data)
224 {
225 debug_message(msg_ctx, private_data, MSG_DEBUG, server_id, data);
226
227 messaging_send_to_children(msg_ctx, MSG_DEBUG, data);
228 }
229
230 static void smbd_parent_id_cache_kill(struct messaging_context *msg_ctx,
231 void *private_data,
232 uint32_t msg_type,
233 struct server_id server_id,
234 DATA_BLOB* data)
235 {
236 const char *msg = (data && data->data)
237 ? (const char *)data->data : "<NULL>";
238 struct id_cache_ref id;
239
240 if (!id_cache_ref_parse(msg, &id)) {
241 DEBUG(0, ("Invalid ?ID: %s\n", msg));
242 return;
243 }
244
245 id_cache_delete_from_cache(&id);
246
247 messaging_send_to_children(msg_ctx, msg_type, data);
248 }
249
250 static void smbd_parent_id_cache_flush(struct messaging_context *ctx,
251 void* data,
252 uint32_t msg_type,
253 struct server_id srv_id,
254 DATA_BLOB* msg_data)
255 {
256 id_cache_flush_message(ctx, data, msg_type, srv_id, msg_data);
257
258 messaging_send_to_children(ctx, msg_type, msg_data);
259 }
260
261 static void smbd_parent_id_cache_delete(struct messaging_context *ctx,
262 void* data,
263 uint32_t msg_type,
264 struct server_id srv_id,
265 DATA_BLOB* msg_data)
266 {
267 id_cache_delete_message(ctx, data, msg_type, srv_id, msg_data);
268
269 messaging_send_to_children(ctx, msg_type, msg_data);
270 }
271
272 static void smb_parent_force_tdis(struct messaging_context *ctx,
273 void* data,
274 uint32_t msg_type,
275 struct server_id srv_id,
276 DATA_BLOB* msg_data)
277 {
278 messaging_send_to_children(ctx, msg_type, msg_data);
279 }
280
281 static void add_child_pid(struct smbd_parent_context *parent,
282 pid_t pid)
283 {
284 struct smbd_child_pid *child;
285
286 child = talloc_zero(parent, struct smbd_child_pid);
287 if (child == NULL) {
288 DEBUG(0, ("Could not add child struct -- malloc failed\n"));
289 return;
290 }
291 child->pid = pid;
292 DLIST_ADD(parent->children, child);
293 parent->num_children += 1;
294 }
295
296 /*
297 at most every smbd:cleanuptime seconds (default 20), we scan the BRL
298 and locking database for entries to cleanup. As a side effect this
299 also cleans up dead entries in the connections database (due to the
300 traversal in message_send_all()
301
302 Using a timer for this prevents a flood of traversals when a large
303 number of clients disconnect at the same time (perhaps due to a
304 network outage).
305 */
306
307 static void cleanup_timeout_fn(struct event_context *event_ctx,
308 struct timed_event *te,
309 struct timeval now,
310 void *private_data)
311 {
312 struct smbd_parent_context *parent =
313 talloc_get_type_abort(private_data,
314 struct smbd_parent_context);
315
316 parent->cleanup_te = NULL;
317
318 DEBUG(1,("Cleaning up brl and lock database after unclean shutdown\n"));
319 message_send_all(parent->msg_ctx, MSG_SMB_UNLOCK, NULL, 0, NULL);
320 messaging_send_buf(parent->msg_ctx,
321 messaging_server_id(parent->msg_ctx),
322 MSG_SMB_BRL_VALIDATE, NULL, 0);
323 }
324
325 static void remove_child_pid(struct smbd_parent_context *parent,
326 pid_t pid,
327 bool unclean_shutdown)
328 {
329 struct smbd_child_pid *child;
330 struct server_id child_id;
331
332 if (unclean_shutdown) {
333 /* a child terminated uncleanly so tickle all
334 processes to see if they can grab any of the
335 pending locks
336 */
337 DEBUG(3,(__location__ " Unclean shutdown of pid %u\n",
338 (unsigned int)pid));
339 if (parent->cleanup_te == NULL) {
340 /* call the cleanup timer, but not too often */
341 int cleanup_time = lp_parm_int(-1, "smbd", "cleanuptime", 20);
342 parent->cleanup_te = tevent_add_timer(parent->ev_ctx,
343 parent,
344 timeval_current_ofs(cleanup_time, 0),
345 cleanup_timeout_fn,
346 parent);
347 DEBUG(1,("Scheduled cleanup of brl and lock database after unclean shutdown\n"));
348 }
349 }
350
351 child_id = pid_to_procid(pid);
352
353 if (!serverid_deregister(child_id)) {
354 DEBUG(1, ("Could not remove pid %d from serverid.tdb\n",
355 (int)pid));
356 }
357
358 for (child = parent->children; child != NULL; child = child->next) {
359 if (child->pid == pid) {
360 struct smbd_child_pid *tmp = child;
361 DLIST_REMOVE(parent->children, child);
362 TALLOC_FREE(tmp);
363 parent->num_children -= 1;
364 return;
365 }
366 }
367
368 /* not all forked child processes are added to the children list */
369 DEBUG(1, ("Could not find child %d -- ignoring\n", (int)pid));
370 }
371
372 /****************************************************************************
373 Have we reached the process limit ?
374 ****************************************************************************/
375
376 static bool allowable_number_of_smbd_processes(struct smbd_parent_context *parent)
377 {
378 int max_processes = lp_max_smbd_processes();
379
380 if (!max_processes)
381 return True;
382
383 return parent->num_children < max_processes;
384 }
385
386 static void smbd_sig_chld_handler(struct tevent_context *ev,
387 struct tevent_signal *se,
388 int signum,
389 int count,
390 void *siginfo,
391 void *private_data)
392 {
393 pid_t pid;
394 int status;
395 struct smbd_parent_context *parent =
396 talloc_get_type_abort(private_data,
397 struct smbd_parent_context);
398
399 while ((pid = sys_waitpid(-1, &status, WNOHANG)) > 0) {
400 bool unclean_shutdown = False;
401
402 /* If the child terminated normally, assume
403 it was an unclean shutdown unless the
404 status is 0
405 */
406 if (WIFEXITED(status)) {
407 unclean_shutdown = WEXITSTATUS(status);
408 }
409 /* If the child terminated due to a signal
410 we always assume it was unclean.
411 */
412 if (WIFSIGNALED(status)) {
413 unclean_shutdown = True;
414 }
415 remove_child_pid(parent, pid, unclean_shutdown);
416 }
417 }
418
419 static void smbd_setup_sig_chld_handler(struct smbd_parent_context *parent)
420 {
421 struct tevent_signal *se;
422
423 se = tevent_add_signal(parent->ev_ctx,
424 parent, /* mem_ctx */
425 SIGCHLD, 0,
426 smbd_sig_chld_handler,
427 parent);
428 if (!se) {
429 exit_server("failed to setup SIGCHLD handler");
430 }
431 }
432
433 static void smbd_open_socket_close_fn(struct tevent_context *ev,
434 struct tevent_fd *fde,
435 int fd,
436 void *private_data)
437 {
438 /* this might be the socket_wrapper swrap_close() */
439 close(fd);
440 }
441
442 static void smbd_accept_connection(struct tevent_context *ev,
443 struct tevent_fd *fde,
444 uint16_t flags,
445 void *private_data)
446 {
447 struct smbd_open_socket *s = talloc_get_type_abort(private_data,
448 struct smbd_open_socket);
449 struct messaging_context *msg_ctx = s->parent->msg_ctx;
450 struct smbd_server_connection *sconn = smbd_server_conn;
451 struct sockaddr_storage addr;
452 socklen_t in_addrlen = sizeof(addr);
453 int fd;
454 pid_t pid = 0;
455 uint64_t unique_id;
456
457 fd = accept(s->fd, (struct sockaddr *)(void *)&addr,&in_addrlen);
458 sconn->sock = fd;
459 if (fd == -1 && errno == EINTR)
460 return;
461
462 if (fd == -1) {
463 DEBUG(0,("open_sockets_smbd: accept: %s\n",
464 strerror(errno)));
465 return;
466 }
467
468 if (s->parent->interactive) {
469 reinit_after_fork(msg_ctx, sconn->ev_ctx, true);
470 smbd_process(ev, sconn);
471 exit_server_cleanly("end of interactive mode");
472 return;
473 }
474
475 if (!allowable_number_of_smbd_processes(s->parent)) {
476 close(fd);
477 sconn->sock = -1;
478 return;
479 }
480
481 /*
482 * Generate a unique id in the parent process so that we use
483 * the global random state in the parent.
484 */
485 unique_id = serverid_get_random_unique_id();
486
487 pid = sys_fork();
488 if (pid == 0) {
489 NTSTATUS status = NT_STATUS_OK;
490
491 /* Child code ... */
492 am_parent = NULL;
493
494 /*
495 * Can't use TALLOC_FREE here. Nulling out the argument to it
496 * would overwrite memory we've just freed.
497 */
498 talloc_free(s->parent);
499 s = NULL;
500
501 set_my_unique_id(unique_id);
502
503 /* Stop zombies, the parent explicitly handles
504 * them, counting worker smbds. */
505 CatchChild();
506
507 status = reinit_after_fork(msg_ctx,
508 ev,
509 true);
510 if (!NT_STATUS_IS_OK(status)) {
511 if (NT_STATUS_EQUAL(status,
512 NT_STATUS_TOO_MANY_OPENED_FILES)) {
513 DEBUG(0,("child process cannot initialize "
514 "because too many files are open\n"));
515 goto exit;
516 }
517 if (lp_clustering() &&
518 NT_STATUS_EQUAL(status,
519 NT_STATUS_INTERNAL_DB_ERROR)) {
520 DEBUG(1,("child process cannot initialize "
521 "because connection to CTDB "
522 "has failed\n"));
523 goto exit;
524 }
525
526 DEBUG(0,("reinit_after_fork() failed\n"));
527 smb_panic("reinit_after_fork() failed");
528 }
529
530 smbd_setup_sig_term_handler(sconn);
531 smbd_setup_sig_hup_handler(sconn);
532
533 if (!serverid_register(messaging_server_id(msg_ctx),
534 FLAG_MSG_GENERAL|FLAG_MSG_SMBD
535 |FLAG_MSG_DBWRAP
536 |FLAG_MSG_PRINT_GENERAL)) {
537 exit_server_cleanly("Could not register myself in "
538 "serverid.tdb");
539 }
540
541 smbd_process(ev, sconn);
542 exit:
543 exit_server_cleanly("end of child");
544 return;
545 }
546
547 if (pid < 0) {
548 DEBUG(0,("smbd_accept_connection: sys_fork() failed: %s\n",
549 strerror(errno)));
550 }
551
552 /* The parent doesn't need this socket */
553 close(fd);
554
555 /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
556 Clear the closed fd info out of server_fd --
557 and more importantly, out of client_fd in
558 util_sock.c, to avoid a possible
559 getpeername failure if we reopen the logs
560 and use %I in the filename.
561 */
562 sconn->sock = -1;
563
564 if (pid != 0) {
565 add_child_pid(s->parent, pid);
566 }
567
568 /* Force parent to check log size after
569 * spawning child. Fix from
570 * klausr@ITAP.Physik.Uni-Stuttgart.De. The
571 * parent smbd will log to logserver.smb. It
572 * writes only two messages for each child
573 * started/finished. But each child writes,
574 * say, 50 messages also in logserver.smb,
575 * begining with the debug_count of the
576 * parent, before the child opens its own log
577 * file logserver.client. In a worst case
578 * scenario the size of logserver.smb would be
579 * checked after about 50*50=2500 messages
580 * (ca. 100kb).
581 * */
582 force_check_log_size();
583 }
584
585 static bool smbd_open_one_socket(struct smbd_parent_context *parent,
586 struct tevent_context *ev_ctx,
587 struct messaging_context *msg_ctx,
588 const struct sockaddr_storage *ifss,
589 uint16_t port)
590 {
591 struct smbd_open_socket *s;
592
593 s = talloc(parent, struct smbd_open_socket);
594 if (!s) {
595 return false;
596 }
597
598 s->parent = parent;
599 s->fd = open_socket_in(SOCK_STREAM,
600 port,
601 parent->sockets == NULL ? 0 : 2,
602 ifss,
603 true);
604 if (s->fd == -1) {
605 DEBUG(0,("smbd_open_once_socket: open_socket_in: "
606 "%s\n", strerror(errno)));
607 TALLOC_FREE(s);
608 /*
609 * We ignore an error here, as we've done before
610 */
611 return true;
612 }
613
614 /* ready to listen */
615 set_socket_options(s->fd, "SO_KEEPALIVE");
616 set_socket_options(s->fd, lp_socket_options());
617
618 /* Set server socket to
619 * non-blocking for the accept. */
620 set_blocking(s->fd, False);
621
622 if (listen(s->fd, SMBD_LISTEN_BACKLOG) == -1) {
623 DEBUG(0,("open_sockets_smbd: listen: "
624 "%s\n", strerror(errno)));
625 close(s->fd);
626 TALLOC_FREE(s);
627 return false;
628 }
629
630 s->fde = tevent_add_fd(ev_ctx,
631 s,
632 s->fd, TEVENT_FD_READ,
633 smbd_accept_connection,
634 s);
635 if (!s->fde) {
636 DEBUG(0,("open_sockets_smbd: "
637 "tevent_add_fd: %s\n",
638 strerror(errno)));
639 close(s->fd);
640 TALLOC_FREE(s);
641 return false;
642 }
643 tevent_fd_set_close_fn(s->fde, smbd_open_socket_close_fn);
644
645 DLIST_ADD_END(parent->sockets, s, struct smbd_open_socket *);
646
647 return true;
648 }
649
650 /****************************************************************************
651 Open the socket communication.
652 ****************************************************************************/
653
654 static bool open_sockets_smbd(struct smbd_parent_context *parent,
655 struct tevent_context *ev_ctx,
656 struct messaging_context *msg_ctx,
657 const char *smb_ports)
658 {
659 int num_interfaces = iface_count();
660 int i;
661 const char *ports;
662 unsigned dns_port = 0;
663
664 #ifdef HAVE_ATEXIT
665 atexit(killkids);
666 #endif
667
668 /* Stop zombies */
669 smbd_setup_sig_chld_handler(parent);
670
671 /* use a reasonable default set of ports - listing on 445 and 139 */
672 if (!smb_ports) {
673 ports = lp_smb_ports();
674 if (!ports || !*ports) {
675 ports = talloc_strdup(talloc_tos(), SMB_PORTS);
676 } else {
677 ports = talloc_strdup(talloc_tos(), ports);
678 }
679 } else {
680 ports = talloc_strdup(talloc_tos(), smb_ports);
681 }
682
683 if (lp_interfaces() && lp_bind_interfaces_only()) {
684 /* We have been given an interfaces line, and been
685 told to only bind to those interfaces. Create a
686 socket per interface and bind to only these.
687 */
688
689 /* Now open a listen socket for each of the
690 interfaces. */
691 for(i = 0; i < num_interfaces; i++) {
692 const struct sockaddr_storage *ifss =
693 iface_n_sockaddr_storage(i);
694 char *tok;
695 const char *ptr;
696
697 if (ifss == NULL) {
698 DEBUG(0,("open_sockets_smbd: "
699 "interface %d has NULL IP address !\n",
700 i));
701 continue;
702 }
703
704 for (ptr=ports;
705 next_token_talloc(talloc_tos(),&ptr, &tok, " \t,");) {
706 unsigned port = atoi(tok);
707 if (port == 0 || port > 0xffff) {
708 continue;
709 }
710
711 /* Keep the first port for mDNS service
712 * registration.
713 */
714 if (dns_port == 0) {
715 dns_port = port;
716 }
717
718 if (!smbd_open_one_socket(parent,
719 ev_ctx,
720 msg_ctx,
721 ifss,
722 port)) {
723 return false;
724 }
725 }
726 }
727 } else {
728 /* Just bind to 0.0.0.0 - accept connections
729 from anywhere. */
730
731 char *tok;
732 const char *ptr;
733 const char *sock_addr = lp_socket_address();
734 char *sock_tok;
735 const char *sock_ptr;
736
737 if (strequal(sock_addr, "0.0.0.0") ||
738 strequal(sock_addr, "::")) {
739 #if HAVE_IPV6
740 sock_addr = "::,0.0.0.0";
741 #else
742 sock_addr = "0.0.0.0";
743 #endif
744 }
745
746 for (sock_ptr=sock_addr;
747 next_token_talloc(talloc_tos(), &sock_ptr, &sock_tok, " \t,"); ) {
748 for (ptr=ports; next_token_talloc(talloc_tos(), &ptr, &tok, " \t,"); ) {
749 struct sockaddr_storage ss;
750
751 unsigned port = atoi(tok);
752 if (port == 0 || port > 0xffff) {
753 continue;
754 }
755
756 /* Keep the first port for mDNS service
757 * registration.
758 */
759 if (dns_port == 0) {
760 dns_port = port;
761 }
762
763 /* open an incoming socket */
764 if (!interpret_string_addr(&ss, sock_tok,
765 AI_NUMERICHOST|AI_PASSIVE)) {
766 continue;
767 }
768
769 if (!smbd_open_one_socket(parent,
770 ev_ctx,
771 msg_ctx,
772 &ss,
773 port)) {
774 return false;
775 }
776 }
777 }
778 }
779
780 if (parent->sockets == NULL) {
781 DEBUG(0,("open_sockets_smbd: No "
782 "sockets available to bind to.\n"));
783 return false;
784 }
785
786 /* Setup the main smbd so that we can get messages. Note that
787 do this after starting listening. This is needed as when in
788 clustered mode, ctdb won't allow us to start doing database
789 operations until it has gone thru a full startup, which
790 includes checking to see that smbd is listening. */
791
792 if (!serverid_register(messaging_server_id(msg_ctx),
793 FLAG_MSG_GENERAL|FLAG_MSG_SMBD
794 |FLAG_MSG_PRINT_GENERAL
795 |FLAG_MSG_DBWRAP)) {
796 DEBUG(0, ("open_sockets_smbd: Failed to register "
797 "myself in serverid.tdb\n"));
798 return false;
799 }
800
801 /* Listen to messages */
802
803 messaging_register(msg_ctx, NULL, MSG_SHUTDOWN, msg_exit_server);
804 messaging_register(msg_ctx, ev_ctx, MSG_SMB_CONF_UPDATED,
805 smbd_parent_conf_updated);
806 messaging_register(msg_ctx, NULL, MSG_SMB_STAT_CACHE_DELETE,
807 smb_stat_cache_delete);
808 messaging_register(msg_ctx, NULL, MSG_DEBUG, smbd_msg_debug);
809 messaging_register(msg_ctx, ev_ctx, MSG_PRINTER_PCAP,
810 smb_pcap_updated);
811 messaging_register(msg_ctx, NULL, MSG_SMB_BRL_VALIDATE,
812 brl_revalidate);
813 messaging_register(msg_ctx, NULL, MSG_SMB_FORCE_TDIS,
814 smb_parent_force_tdis);
815
816 messaging_register(msg_ctx, NULL,
817 ID_CACHE_FLUSH, smbd_parent_id_cache_flush);
818 messaging_register(msg_ctx, NULL,
819 ID_CACHE_DELETE, smbd_parent_id_cache_delete);
820 messaging_register(msg_ctx, NULL,
821 ID_CACHE_KILL, smbd_parent_id_cache_kill);
822
823 #ifdef CLUSTER_SUPPORT
824 if (lp_clustering()) {
825 ctdbd_register_reconfigure(messaging_ctdbd_connection());
826 }
827 #endif
828
829 #ifdef DEVELOPER
830 messaging_register(msg_ctx, NULL, MSG_SMB_INJECT_FAULT,
831 msg_inject_fault);
832 #endif
833
834 if (lp_multicast_dns_register() && (dns_port != 0)) {
835 #ifdef WITH_DNSSD_SUPPORT
836 smbd_setup_mdns_registration(ev_ctx,
837 parent, dns_port);
838 #endif
839 #ifdef WITH_AVAHI_SUPPORT
840 void *avahi_conn;
841
842 avahi_conn = avahi_start_register(ev_ctx,
843 ev_ctx,
844 dns_port);
845 if (avahi_conn == NULL) {
846 DEBUG(10, ("avahi_start_register failed\n"));
847 }
848 #endif
849 }
850
851 return true;
852 }
853
854
855 /*
856 handle stdin becoming readable when we are in --foreground mode
857 */
858 static void smbd_stdin_handler(struct tevent_context *ev,
859 struct tevent_fd *fde,
860 uint16_t flags,
861 void *private_data)
862 {
863 char c;
864 if (read(0, &c, 1) != 1) {
865 /* we have reached EOF on stdin, which means the
866 parent has exited. Shutdown the server */
867 exit_server_cleanly("EOF on stdin");
868 }
869 }
870
871 static void smbd_parent_loop(struct tevent_context *ev_ctx,
872 struct smbd_parent_context *parent)
873 {
874 /* now accept incoming connections - forking a new process
875 for each incoming connection */
876 DEBUG(2,("waiting for connections\n"));
877 while (1) {
878 int ret;
879 TALLOC_CTX *frame = talloc_stackframe();
880
881 ret = tevent_loop_once(ev_ctx);
882 if (ret != 0) {
883 exit_server_cleanly("tevent_loop_once() error");
884 }
885
886 TALLOC_FREE(frame);
887 } /* end while 1 */
888
889 /* NOTREACHED return True; */
890 }
891
892
893 /****************************************************************************
894 Initialise connect, service and file structs.
895 ****************************************************************************/
896
897 static bool init_structs(void )
898 {
899 /*
900 * Set the machine NETBIOS name if not already
901 * set from the config file.
902 */
903
904 if (!init_names())
905 return False;
906
907 if (!secrets_init())
908 return False;
909
910 return True;
911 }
912
913 static void smbd_parent_sig_term_handler(struct tevent_context *ev,
914 struct tevent_signal *se,
915 int signum,
916 int count,
917 void *siginfo,
918 void *private_data)
919 {
920 exit_server_cleanly("termination signal");
921 }
922
923 static void smbd_parent_sig_hup_handler(struct tevent_context *ev,
924 struct tevent_signal *se,
925 int signum,
926 int count,
927 void *siginfo,
928 void *private_data)
929 {
930 struct smbd_parent_context *parent =
931 talloc_get_type_abort(private_data,
932 struct smbd_parent_context);
933
934 change_to_root_user();
935 DEBUG(1,("parent: Reloading services after SIGHUP\n"));
936 reload_services(NULL, NULL, false);
937
938 printing_subsystem_update(parent->ev_ctx, parent->msg_ctx, true);
939 }
940
941 /****************************************************************************
942 main program.
943 ****************************************************************************/
944
945 /* Declare prototype for build_options() to avoid having to run it through
946 mkproto.h. Mixing $(builddir) and $(srcdir) source files in the current
947 prototype generation system is too complicated. */
948
949 extern void build_options(bool screen);
950
951 int main(int argc,const char *argv[])
952 {
953 /* shall I run as a daemon */
954 bool is_daemon = false;
955 bool interactive = false;
956 bool Fork = true;
957 bool no_process_group = false;
958 bool log_stdout = false;
959 char *ports = NULL;
960 char *profile_level = NULL;
961 int opt;
962 poptContext pc;
963 bool print_build_options = False;
964 enum {
965 OPT_DAEMON = 1000,
966 OPT_INTERACTIVE,
967 OPT_FORK,
968 OPT_NO_PROCESS_GROUP,
969 OPT_LOG_STDOUT
970 };
971 struct poptOption long_options[] = {
972 POPT_AUTOHELP
973 {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
974 {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)"},
975 {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools, etc.)" },
976 {"no-process-group", '\0', POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
977 {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
978 {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
979 {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
980 {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
981 POPT_COMMON_SAMBA
982 POPT_COMMON_DYNCONFIG
983 POPT_TABLEEND
984 };
985 struct smbd_parent_context *parent = NULL;
986 TALLOC_CTX *frame;
987 NTSTATUS status;
988 struct tevent_context *ev_ctx;
989 struct messaging_context *msg_ctx;
990 struct tevent_signal *se;
991
992 /*
993 * Do this before any other talloc operation
994 */
995 talloc_enable_null_tracking();
996 frame = talloc_stackframe();
997
998 setup_logging(argv[0], DEBUG_DEFAULT_STDOUT);
999
1000 load_case_tables();
1001
1002 smbd_init_globals();
1003
1004 TimeInit();
1005
1006 #ifdef HAVE_SET_AUTH_PARAMETERS
1007 set_auth_parameters(argc,argv);
1008 #endif
1009
1010 pc = poptGetContext("smbd", argc, argv, long_options, 0);
1011 while((opt = poptGetNextOpt(pc)) != -1) {
1012 switch (opt) {
1013 case OPT_DAEMON:
1014 is_daemon = true;
1015 break;
1016 case OPT_INTERACTIVE:
1017 interactive = true;
1018 break;
1019 case OPT_FORK:
1020 Fork = false;
1021 break;
1022 case OPT_NO_PROCESS_GROUP:
1023 no_process_group = true;
1024 break;
1025 case OPT_LOG_STDOUT:
1026 log_stdout = true;
1027 break;
1028 case 'b':
1029 print_build_options = True;
1030 break;
1031 default:
1032 d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1033 poptBadOption(pc, 0), poptStrerror(opt));
1034 poptPrintUsage(pc, stderr, 0);
1035 exit(1);
1036 }
1037 }
1038 poptFreeContext(pc);
1039
1040 if (interactive) {
1041 Fork = False;
1042 log_stdout = True;
1043 }
1044
1045 if (log_stdout) {
1046 setup_logging(argv[0], DEBUG_STDOUT);
1047 } else {
1048 setup_logging(argv[0], DEBUG_FILE);
1049 }
1050
1051 if (print_build_options) {
1052 build_options(True); /* Display output to screen as well as debug */
1053 exit(0);
1054 }
1055
1056 #ifdef HAVE_SETLUID
1057 /* needed for SecureWare on SCO */
1058 setluid(0);
1059 #endif
1060
1061 set_remote_machine_name("smbd", False);
1062
1063 if (interactive && (DEBUGLEVEL >= 9)) {
1064 talloc_enable_leak_report();
1065 }
1066
1067 if (log_stdout && Fork) {
1068 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
1069 exit(1);
1070 }
1071
1072 /* we want to re-seed early to prevent time delays causing
1073 client problems at a later date. (tridge) */
1074 generate_random_buffer(NULL, 0);
1075
1076 /* get initial effective uid and gid */
1077 sec_init();
1078
1079 /* make absolutely sure we run as root - to handle cases where people
1080 are crazy enough to have it setuid */
1081 gain_root_privilege();
1082 gain_root_group_privilege();
1083
1084 fault_setup();
1085 dump_core_setup("smbd", lp_logfile());
1086
1087 /* we are never interested in SIGPIPE */
1088 BlockSignals(True,SIGPIPE);
1089
1090 #if defined(SIGFPE)
1091 /* we are never interested in SIGFPE */
1092 BlockSignals(True,SIGFPE);
1093 #endif
1094
1095 #if defined(SIGUSR2)
1096 /* We are no longer interested in USR2 */
1097 BlockSignals(True,SIGUSR2);
1098 #endif
1099
1100 /* POSIX demands that signals are inherited. If the invoking process has
1101 * these signals masked, we will have problems, as we won't recieve them. */
1102 BlockSignals(False, SIGHUP);
1103 BlockSignals(False, SIGUSR1);
1104 BlockSignals(False, SIGTERM);
1105
1106 /* Ensure we leave no zombies until we
1107 * correctly set up child handling below. */
1108
1109 CatchChild();
1110
1111 /* we want total control over the permissions on created files,
1112 so set our umask to 0 */
1113 umask(0);
1114
1115 reopen_logs();
1116
1117 DEBUG(0,("smbd version %s started.\n", samba_version_string()));
1118 DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1119
1120 DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
1121 (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
1122
1123 /* Output the build options to the debug log */
1124 build_options(False);
1125
1126 if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
1127 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
1128 exit(1);
1129 }
1130
1131 if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1132 DEBUG(0, ("error opening config file '%s'\n", get_dyn_CONFIGFILE()));
1133 exit(1);
1134 }
1135
1136 /* Init the security context and global current_user */
1137 init_sec_ctx();
1138
1139 /*
1140 * Initialize the event context. The event context needs to be
1141 * initialized before the messaging context, cause the messaging
1142 * context holds an event context.
1143 * FIXME: This should be s3_tevent_context_init()
1144 */
1145 ev_ctx = server_event_context();
1146 if (ev_ctx == NULL) {
1147 exit(1);
1148 }
1149
1150 /*
1151 * Init the messaging context
1152 * FIXME: This should only call messaging_init()
1153 */
1154 msg_ctx = server_messaging_context();
1155 if (msg_ctx == NULL) {
1156 exit(1);
1157 }
1158
1159 /*
1160 * Reloading of the printers will not work here as we don't have a
1161 * server info and rpc services set up. It will be called later.
1162 */
1163 if (!reload_services(NULL, NULL, false)) {
1164 exit(1);
1165 }
1166
1167 /* ...NOTE... Log files are working from this point! */
1168
1169 DEBUG(3,("loaded services\n"));
1170
1171 init_structs();
1172
1173 #ifdef WITH_PROFILE
1174 if (!profile_setup(msg_ctx, False)) {
1175 DEBUG(0,("ERROR: failed to setup profiling\n"));
1176 return -1;
1177 }
1178 if (profile_level != NULL) {
1179 int pl = atoi(profile_level);
1180 struct server_id src;
1181
1182 DEBUG(1, ("setting profiling level: %s\n",profile_level));
1183 src.pid = getpid();
1184 set_profile_level(pl, src);
1185 }
1186 #endif
1187
1188 if (!is_daemon && !is_a_socket(0)) {
1189 if (!interactive)
1190 DEBUG(0,("standard input is not a socket, assuming -D option\n"));
1191
1192 /*
1193 * Setting is_daemon here prevents us from eventually calling
1194 * the open_sockets_inetd()
1195 */
1196
1197 is_daemon = True;
1198 }
1199
1200 if (is_daemon && !interactive) {
1201 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1202 become_daemon(Fork, no_process_group, log_stdout);
1203 }
1204
1205 set_my_unique_id(serverid_get_random_unique_id());
1206
1207 #if HAVE_SETPGID
1208 /*
1209 * If we're interactive we want to set our own process group for
1210 * signal management.
1211 */
1212 if (interactive && !no_process_group)
1213 setpgid( (pid_t)0, (pid_t)0);
1214 #endif
1215
1216 if (!directory_exist(lp_lockdir()))
1217 mkdir(lp_lockdir(), 0755);
1218
1219 if (!directory_exist(lp_piddir()))
1220 mkdir(lp_piddir(), 0755);
1221
1222 if (is_daemon)
1223 pidfile_create("smbd");
1224
1225 status = reinit_after_fork(msg_ctx,
1226 ev_ctx,
1227 false);
1228 if (!NT_STATUS_IS_OK(status)) {
1229 DEBUG(0,("reinit_after_fork() failed\n"));
1230 exit(1);
1231 }
1232
1233 smbd_server_conn->msg_ctx = msg_ctx;
1234
1235 parent = talloc_zero(ev_ctx, struct smbd_parent_context);
1236 if (!parent) {
1237 exit_server("talloc(struct smbd_parent_context) failed");
1238 }
1239 parent->interactive = interactive;
1240 parent->ev_ctx = ev_ctx;
1241 parent->msg_ctx = msg_ctx;
1242 am_parent = parent;
1243
1244 se = tevent_add_signal(parent->ev_ctx,
1245 parent,
1246 SIGTERM, 0,
1247 smbd_parent_sig_term_handler,
1248 parent);
1249 if (!se) {
1250 exit_server("failed to setup SIGTERM handler");
1251 }
1252 se = tevent_add_signal(parent->ev_ctx,
1253 parent,
1254 SIGHUP, 0,
1255 smbd_parent_sig_hup_handler,
1256 parent);
1257 if (!se) {
1258 exit_server("failed to setup SIGHUP handler");
1259 }
1260
1261 /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1262
1263 if (smbd_memcache() == NULL) {
1264 exit(1);
1265 }
1266
1267 memcache_set_global(smbd_memcache());
1268
1269 /* Initialise the password backed before the global_sam_sid
1270 to ensure that we fetch from ldap before we make a domain sid up */
1271
1272 if(!initialize_password_db(false, ev_ctx))
1273 exit(1);
1274
1275 if (!secrets_init()) {
1276 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1277 exit(1);
1278 }
1279
1280 if (lp_server_role() == ROLE_DOMAIN_BDC || lp_server_role() == ROLE_DOMAIN_PDC) {
1281 struct loadparm_context *lp_ctx = loadparm_init_s3(NULL, loadparm_s3_context());
1282 if (!open_schannel_session_store(NULL, lp_ctx)) {
1283 DEBUG(0,("ERROR: Samba cannot open schannel store for secured NETLOGON operations.\n"));
1284 exit(1);
1285 }
1286 TALLOC_FREE(lp_ctx);
1287 }
1288
1289 if(!get_global_sam_sid()) {
1290 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1291 exit(1);
1292 }
1293
1294 if (!sessionid_init()) {
1295 exit(1);
1296 }
1297
1298 if (!connections_init(True))
1299 exit(1);
1300
1301 if (!locking_init())
1302 exit(1);
1303
1304 if (!messaging_tdb_parent_init(ev_ctx)) {
1305 exit(1);
1306 }
1307
1308 if (!notify_internal_parent_init(ev_ctx)) {
1309 exit(1);
1310 }
1311
1312 if (!serverid_parent_init(ev_ctx)) {
1313 exit(1);
1314 }
1315
1316 if (!W_ERROR_IS_OK(registry_init_full()))
1317 exit(1);
1318
1319 /* Open the share_info.tdb here, so we don't have to open
1320 after the fork on every single connection. This is a small
1321 performance improvment and reduces the total number of system
1322 fds used. */
1323 if (!share_info_db_init()) {
1324 DEBUG(0,("ERROR: failed to load share info db.\n"));
1325 exit(1);
1326 }
1327
1328 status = init_system_info();
1329 if (!NT_STATUS_IS_OK(status)) {
1330 DEBUG(1, ("ERROR: failed to setup system user info: %s.\n",
1331 nt_errstr(status)));
1332 return -1;
1333 }
1334
1335 if (!init_guest_info()) {
1336 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1337 return -1;
1338 }
1339
1340 if (!file_init(smbd_server_conn)) {
1341 DEBUG(0, ("ERROR: file_init failed\n"));
1342 return -1;
1343 }
1344
1345 /* This MUST be done before start_epmd() because otherwise
1346 * start_epmd() forks and races against dcesrv_ep_setup() to
1347 * call directory_create_or_exist() */
1348 if (!directory_create_or_exist(lp_ncalrpc_dir(), geteuid(), 0755)) {
1349 DEBUG(0, ("Failed to create pipe directory %s - %s\n",
1350 lp_ncalrpc_dir(), strerror(errno)));
1351 return -1;
1352 }
1353
1354 if (is_daemon && !interactive) {
1355 if (rpc_epmapper_daemon() == RPC_DAEMON_FORK) {
1356 start_epmd(ev_ctx, msg_ctx);
1357 }
1358 }
1359
1360 /* only start other daemons if we are running as a daemon
1361 * -- bad things will happen if smbd is launched via inetd
1362 * and we fork a copy of ourselves here */
1363 if (is_daemon && !interactive) {
1364
1365 if (rpc_lsasd_daemon() == RPC_DAEMON_FORK) {
1366 start_lsasd(ev_ctx, msg_ctx);
1367 }
1368
1369 if (!_lp_disable_spoolss() &&
1370 (rpc_spoolss_daemon() != RPC_DAEMON_DISABLED)) {
1371 bool bgq = lp_parm_bool(-1, "smbd", "backgroundqueue", true);
1372
1373 if (!printing_subsystem_init(ev_ctx, msg_ctx, true, bgq)) {
1374 exit(1);
1375 }
1376 }
1377 } else if (!_lp_disable_spoolss() &&
1378 (rpc_spoolss_daemon() != RPC_DAEMON_DISABLED)) {
1379 if (!printing_subsystem_init(ev_ctx, msg_ctx, false, false)) {
1380 exit(1);
1381 }
1382 }
1383
1384 if (!dcesrv_ep_setup(ev_ctx, msg_ctx)) {
1385 exit(1);
1386 }
1387
1388 if (!is_daemon) {
1389 /* inetd mode */
1390 TALLOC_FREE(frame);
1391
1392 /* Started from inetd. fd 0 is the socket. */
1393 /* We will abort gracefully when the client or remote system
1394 goes away */
1395 smbd_server_conn->sock = dup(0);
1396
1397 /* close stdin, stdout (if not logging to it), but not stderr */
1398 close_low_fds(true, !debug_get_output_is_stdout(), false);
1399
1400 #ifdef HAVE_ATEXIT
1401 atexit(killkids);
1402 #endif
1403
1404 /* Stop zombies */
1405 smbd_setup_sig_chld_handler(parent);
1406
1407 smbd_process(ev_ctx, smbd_server_conn);
1408
1409 exit_server_cleanly(NULL);
1410 return(0);
1411 }
1412
1413 if (!open_sockets_smbd(parent, ev_ctx, msg_ctx, ports))
1414 exit_server("open_sockets_smbd() failed");
1415
1416 /* do a printer update now that all messaging has been set up,
1417 * before we allow clients to start connecting */
1418 printing_subsystem_update(ev_ctx, msg_ctx, false);
1419
1420 TALLOC_FREE(frame);
1421 /* make sure we always have a valid stackframe */
1422 frame = talloc_stackframe();
1423
1424 if (!Fork) {
1425 /* if we are running in the foreground then look for
1426 EOF on stdin, and exit if it happens. This allows
1427 us to die if the parent process dies
1428 */
1429 tevent_add_fd(ev_ctx, parent, 0, TEVENT_FD_READ, smbd_stdin_handler, NULL);
1430 }
1431
1432 smbd_parent_loop(ev_ctx, parent);
1433
1434 exit_server_cleanly(NULL);
1435 TALLOC_FREE(frame);
1436 return(0);
1437 }
reg import