s3: include smbd/smbd.h where needed.
[mat/samba.git] / source3 / smbd / server.c
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 "librpc/gen_ndr/messaging.h"
30 #include "registry.h"
31 #include "registry/reg_init_full.h"
32 #include "libcli/auth/schannel.h"
33 #include "secrets.h"
34 #include "memcache.h"
35 #include "ctdbd_conn.h"
36 #include "printing/printer_list.h"
37 #include "rpc_server/rpc_ep_setup.h"
38 #include "printing/pcap.h"
39 #include "printing.h"
40 #include "serverid.h"
41 #include "passdb.h"
42
43 extern void start_epmd(struct tevent_context *ev_ctx,
44                        struct messaging_context *msg_ctx);
45
46 extern void start_spoolssd(struct event_context *ev_ctx,
47                            struct messaging_context *msg_ctx);
48
49 #ifdef WITH_DFS
50 extern int dcelogin_atmost_once;
51 #endif /* WITH_DFS */
52
53 static void smbd_set_server_fd(int fd)
54 {
55         struct smbd_server_connection *sconn = smbd_server_conn;
56         char addr[INET6_ADDRSTRLEN];
57         const char *name;
58
59         sconn->sock = fd;
60
61         /*
62          * Initialize sconn->client_id: If we can't find the client's
63          * name, default to its address.
64          */
65
66         client_addr(fd, sconn->client_id.addr, sizeof(sconn->client_id.addr));
67
68         name = client_name(sconn->sock);
69         if (strcmp(name, "UNKNOWN") != 0) {
70                 name = talloc_strdup(sconn, name);
71         } else {
72                 name = NULL;
73         }
74         sconn->client_id.name =
75                 (name != NULL) ? name : sconn->client_id.addr;
76
77         sub_set_socket_ids(sconn->client_id.addr, sconn->client_id.name,
78                            client_socket_addr(sconn->sock, addr,
79                                               sizeof(addr)));
80 }
81
82 struct event_context *smbd_event_context(void)
83 {
84         return server_event_context();
85 }
86
87 /*******************************************************************
88  What to do when smb.conf is updated.
89  ********************************************************************/
90
91 static void smb_conf_updated(struct messaging_context *msg,
92                              void *private_data,
93                              uint32_t msg_type,
94                              struct server_id server_id,
95                              DATA_BLOB *data)
96 {
97         struct tevent_context *ev_ctx =
98                 talloc_get_type_abort(private_data, struct tevent_context);
99
100         DEBUG(10,("smb_conf_updated: Got message saying smb.conf was "
101                   "updated. Reloading.\n"));
102         change_to_root_user();
103         reload_services(msg, smbd_server_conn->sock, False);
104         if (am_parent) {
105                 pcap_cache_reload(ev_ctx, msg,
106                                   &reload_pcap_change_notify);
107         }
108 }
109
110 /*******************************************************************
111  What to do when printcap is updated.
112  ********************************************************************/
113
114 static void smb_pcap_updated(struct messaging_context *msg,
115                              void *private_data,
116                              uint32_t msg_type,
117                              struct server_id server_id,
118                              DATA_BLOB *data)
119 {
120         struct tevent_context *ev_ctx =
121                 talloc_get_type_abort(private_data, struct tevent_context);
122
123         DEBUG(10,("Got message saying pcap was updated. Reloading.\n"));
124         change_to_root_user();
125         reload_printers(ev_ctx, msg);
126 }
127
128 /*******************************************************************
129  Delete a statcache entry.
130  ********************************************************************/
131
132 static void smb_stat_cache_delete(struct messaging_context *msg,
133                                   void *private_data,
134                                   uint32_t msg_tnype,
135                                   struct server_id server_id,
136                                   DATA_BLOB *data)
137 {
138         const char *name = (const char *)data->data;
139         DEBUG(10,("smb_stat_cache_delete: delete name %s\n", name));
140         stat_cache_delete(name);
141 }
142
143 /****************************************************************************
144   Send a SIGTERM to our process group.
145 *****************************************************************************/
146
147 static void  killkids(void)
148 {
149         if(am_parent) kill(0,SIGTERM);
150 }
151
152 /****************************************************************************
153  Process a sam sync message - not sure whether to do this here or
154  somewhere else.
155 ****************************************************************************/
156
157 static void msg_sam_sync(struct messaging_context *msg,
158                          void *private_data,
159                          uint32_t msg_type,
160                          struct server_id server_id,
161                          DATA_BLOB *data)
162 {
163         DEBUG(10, ("** sam sync message received, ignoring\n"));
164 }
165
166 static void msg_exit_server(struct messaging_context *msg,
167                             void *private_data,
168                             uint32_t msg_type,
169                             struct server_id server_id,
170                             DATA_BLOB *data)
171 {
172         DEBUG(3, ("got a SHUTDOWN message\n"));
173         exit_server_cleanly(NULL);
174 }
175
176 #ifdef DEVELOPER
177 static void msg_inject_fault(struct messaging_context *msg,
178                              void *private_data,
179                              uint32_t msg_type,
180                              struct server_id src,
181                              DATA_BLOB *data)
182 {
183         int sig;
184
185         if (data->length != sizeof(sig)) {
186                 DEBUG(0, ("Process %s sent bogus signal injection request\n",
187                           procid_str_static(&src)));
188                 return;
189         }
190
191         sig = *(int *)data->data;
192         if (sig == -1) {
193                 exit_server("internal error injected");
194                 return;
195         }
196
197 #if HAVE_STRSIGNAL
198         DEBUG(0, ("Process %s requested injection of signal %d (%s)\n",
199                   procid_str_static(&src), sig, strsignal(sig)));
200 #else
201         DEBUG(0, ("Process %s requested injection of signal %d\n",
202                   procid_str_static(&src), sig));
203 #endif
204
205         kill(sys_getpid(), sig);
206 }
207 #endif /* DEVELOPER */
208
209 /*
210  * Parent smbd process sets its own debug level first and then
211  * sends a message to all the smbd children to adjust their debug
212  * level to that of the parent.
213  */
214
215 static void smbd_msg_debug(struct messaging_context *msg_ctx,
216                            void *private_data,
217                            uint32_t msg_type,
218                            struct server_id server_id,
219                            DATA_BLOB *data)
220 {
221         struct child_pid *child;
222
223         debug_message(msg_ctx, private_data, MSG_DEBUG, server_id, data);
224
225         for (child = children; child != NULL; child = child->next) {
226                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
227                                    MSG_DEBUG,
228                                    data->data,
229                                    strlen((char *) data->data) + 1);
230         }
231 }
232
233 static void add_child_pid(pid_t pid)
234 {
235         struct child_pid *child;
236
237         child = SMB_MALLOC_P(struct child_pid);
238         if (child == NULL) {
239                 DEBUG(0, ("Could not add child struct -- malloc failed\n"));
240                 return;
241         }
242         child->pid = pid;
243         DLIST_ADD(children, child);
244         num_children += 1;
245 }
246
247 /*
248   at most every smbd:cleanuptime seconds (default 20), we scan the BRL
249   and locking database for entries to cleanup. As a side effect this
250   also cleans up dead entries in the connections database (due to the
251   traversal in message_send_all()
252
253   Using a timer for this prevents a flood of traversals when a large
254   number of clients disconnect at the same time (perhaps due to a
255   network outage).  
256 */
257
258 static void cleanup_timeout_fn(struct event_context *event_ctx,
259                                 struct timed_event *te,
260                                 struct timeval now,
261                                 void *private_data)
262 {
263         struct timed_event **cleanup_te = (struct timed_event **)private_data;
264
265         DEBUG(1,("Cleaning up brl and lock database after unclean shutdown\n"));
266         message_send_all(smbd_messaging_context(), MSG_SMB_UNLOCK, NULL, 0, NULL);
267         messaging_send_buf(smbd_messaging_context(), procid_self(),
268                                 MSG_SMB_BRL_VALIDATE, NULL, 0);
269         /* mark the cleanup as having been done */
270         (*cleanup_te) = NULL;
271 }
272
273 static void remove_child_pid(pid_t pid, bool unclean_shutdown)
274 {
275         struct child_pid *child;
276         static struct timed_event *cleanup_te;
277         struct server_id child_id;
278
279         if (unclean_shutdown) {
280                 /* a child terminated uncleanly so tickle all
281                    processes to see if they can grab any of the
282                    pending locks
283                 */
284                 DEBUG(3,(__location__ " Unclean shutdown of pid %u\n",
285                         (unsigned int)pid));
286                 if (!cleanup_te) {
287                         /* call the cleanup timer, but not too often */
288                         int cleanup_time = lp_parm_int(-1, "smbd", "cleanuptime", 20);
289                         cleanup_te = event_add_timed(smbd_event_context(), NULL,
290                                                 timeval_current_ofs(cleanup_time, 0),
291                                                 cleanup_timeout_fn,
292                                                 &cleanup_te);
293                         DEBUG(1,("Scheduled cleanup of brl and lock database after unclean shutdown\n"));
294                 }
295         }
296
297         child_id = procid_self(); /* Just initialize pid and potentially vnn */
298         child_id.pid = pid;
299
300         if (!serverid_deregister(child_id)) {
301                 DEBUG(1, ("Could not remove pid %d from serverid.tdb\n",
302                           (int)pid));
303         }
304
305         for (child = children; child != NULL; child = child->next) {
306                 if (child->pid == pid) {
307                         struct child_pid *tmp = child;
308                         DLIST_REMOVE(children, child);
309                         SAFE_FREE(tmp);
310                         num_children -= 1;
311                         return;
312                 }
313         }
314
315         /* not all forked child processes are added to the children list */
316         DEBUG(1, ("Could not find child %d -- ignoring\n", (int)pid));
317 }
318
319 /****************************************************************************
320  Have we reached the process limit ?
321 ****************************************************************************/
322
323 static bool allowable_number_of_smbd_processes(void)
324 {
325         int max_processes = lp_max_smbd_processes();
326
327         if (!max_processes)
328                 return True;
329
330         return num_children < max_processes;
331 }
332
333 static void smbd_sig_chld_handler(struct tevent_context *ev,
334                                   struct tevent_signal *se,
335                                   int signum,
336                                   int count,
337                                   void *siginfo,
338                                   void *private_data)
339 {
340         pid_t pid;
341         int status;
342
343         while ((pid = sys_waitpid(-1, &status, WNOHANG)) > 0) {
344                 bool unclean_shutdown = False;
345
346                 /* If the child terminated normally, assume
347                    it was an unclean shutdown unless the
348                    status is 0
349                 */
350                 if (WIFEXITED(status)) {
351                         unclean_shutdown = WEXITSTATUS(status);
352                 }
353                 /* If the child terminated due to a signal
354                    we always assume it was unclean.
355                 */
356                 if (WIFSIGNALED(status)) {
357                         unclean_shutdown = True;
358                 }
359                 remove_child_pid(pid, unclean_shutdown);
360         }
361 }
362
363 static void smbd_setup_sig_chld_handler(void)
364 {
365         struct tevent_signal *se;
366
367         se = tevent_add_signal(smbd_event_context(),
368                                smbd_event_context(),
369                                SIGCHLD, 0,
370                                smbd_sig_chld_handler,
371                                NULL);
372         if (!se) {
373                 exit_server("failed to setup SIGCHLD handler");
374         }
375 }
376
377 struct smbd_open_socket;
378
379 struct smbd_parent_context {
380         bool interactive;
381
382         /* the list of listening sockets */
383         struct smbd_open_socket *sockets;
384 };
385
386 struct smbd_open_socket {
387         struct smbd_open_socket *prev, *next;
388         struct smbd_parent_context *parent;
389         int fd;
390         struct tevent_fd *fde;
391 };
392
393 static void smbd_open_socket_close_fn(struct tevent_context *ev,
394                                       struct tevent_fd *fde,
395                                       int fd,
396                                       void *private_data)
397 {
398         /* this might be the socket_wrapper swrap_close() */
399         close(fd);
400 }
401
402 static void smbd_accept_connection(struct tevent_context *ev,
403                                    struct tevent_fd *fde,
404                                    uint16_t flags,
405                                    void *private_data)
406 {
407         struct smbd_open_socket *s = talloc_get_type_abort(private_data,
408                                      struct smbd_open_socket);
409         struct sockaddr_storage addr;
410         socklen_t in_addrlen = sizeof(addr);
411         int fd;
412         pid_t pid = 0;
413         uint64_t unique_id;
414
415         fd = accept(s->fd, (struct sockaddr *)(void *)&addr,&in_addrlen);
416         smbd_set_server_fd(fd);
417
418         if (fd == -1 && errno == EINTR)
419                 return;
420
421         if (fd == -1) {
422                 DEBUG(0,("open_sockets_smbd: accept: %s\n",
423                          strerror(errno)));
424                 return;
425         }
426
427         if (s->parent->interactive) {
428                 smbd_process(smbd_server_conn);
429                 exit_server_cleanly("end of interactive mode");
430                 return;
431         }
432
433         if (!allowable_number_of_smbd_processes()) {
434                 close(fd);
435                 smbd_set_server_fd(-1);
436                 return;
437         }
438
439         /*
440          * Generate a unique id in the parent process so that we use
441          * the global random state in the parent.
442          */
443         generate_random_buffer((uint8_t *)&unique_id, sizeof(unique_id));
444
445         pid = sys_fork();
446         if (pid == 0) {
447                 NTSTATUS status = NT_STATUS_OK;
448
449                 /* Child code ... */
450                 am_parent = 0;
451
452                 set_my_unique_id(unique_id);
453
454                 /* Stop zombies, the parent explicitly handles
455                  * them, counting worker smbds. */
456                 CatchChild();
457
458                 /* close our standard file
459                    descriptors */
460                 close_low_fds(False);
461
462                 /*
463                  * Can't use TALLOC_FREE here. Nulling out the argument to it
464                  * would overwrite memory we've just freed.
465                  */
466                 talloc_free(s->parent);
467                 s = NULL;
468
469                 status = reinit_after_fork(smbd_messaging_context(),
470                                            smbd_event_context(), procid_self(),
471                                            true);
472                 if (!NT_STATUS_IS_OK(status)) {
473                         if (NT_STATUS_EQUAL(status,
474                                             NT_STATUS_TOO_MANY_OPENED_FILES)) {
475                                 DEBUG(0,("child process cannot initialize "
476                                          "because too many files are open\n"));
477                                 goto exit;
478                         }
479                         DEBUG(0,("reinit_after_fork() failed\n"));
480                         smb_panic("reinit_after_fork() failed");
481                 }
482
483                 smbd_setup_sig_term_handler();
484                 smbd_setup_sig_hup_handler(server_event_context(),
485                                            server_messaging_context());
486
487                 if (!serverid_register(procid_self(),
488                                        FLAG_MSG_GENERAL|FLAG_MSG_SMBD
489                                        |FLAG_MSG_DBWRAP
490                                        |FLAG_MSG_PRINT_GENERAL)) {
491                         exit_server_cleanly("Could not register myself in "
492                                             "serverid.tdb");
493                 }
494
495                 smbd_process(smbd_server_conn);
496          exit:
497                 exit_server_cleanly("end of child");
498                 return;
499         }
500
501         if (pid < 0) {
502                 DEBUG(0,("smbd_accept_connection: sys_fork() failed: %s\n",
503                          strerror(errno)));
504         }
505
506         /* The parent doesn't need this socket */
507         close(fd);
508
509         /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
510                 Clear the closed fd info out of server_fd --
511                 and more importantly, out of client_fd in
512                 util_sock.c, to avoid a possible
513                 getpeername failure if we reopen the logs
514                 and use %I in the filename.
515         */
516
517         smbd_set_server_fd(-1);
518
519         if (pid != 0) {
520                 add_child_pid(pid);
521         }
522
523         /* Force parent to check log size after
524          * spawning child.  Fix from
525          * klausr@ITAP.Physik.Uni-Stuttgart.De.  The
526          * parent smbd will log to logserver.smb.  It
527          * writes only two messages for each child
528          * started/finished. But each child writes,
529          * say, 50 messages also in logserver.smb,
530          * begining with the debug_count of the
531          * parent, before the child opens its own log
532          * file logserver.client. In a worst case
533          * scenario the size of logserver.smb would be
534          * checked after about 50*50=2500 messages
535          * (ca. 100kb).
536          * */
537         force_check_log_size();
538 }
539
540 static bool smbd_open_one_socket(struct smbd_parent_context *parent,
541                                  const struct sockaddr_storage *ifss,
542                                  uint16_t port)
543 {
544         struct smbd_open_socket *s;
545
546         s = talloc(parent, struct smbd_open_socket);
547         if (!s) {
548                 return false;
549         }
550
551         s->parent = parent;
552         s->fd = open_socket_in(SOCK_STREAM,
553                                port,
554                                parent->sockets == NULL ? 0 : 2,
555                                ifss,
556                                true);
557         if (s->fd == -1) {
558                 DEBUG(0,("smbd_open_once_socket: open_socket_in: "
559                         "%s\n", strerror(errno)));
560                 TALLOC_FREE(s);
561                 /*
562                  * We ignore an error here, as we've done before
563                  */
564                 return true;
565         }
566
567         /* ready to listen */
568         set_socket_options(s->fd, "SO_KEEPALIVE");
569         set_socket_options(s->fd, lp_socket_options());
570
571         /* Set server socket to
572          * non-blocking for the accept. */
573         set_blocking(s->fd, False);
574
575         if (listen(s->fd, SMBD_LISTEN_BACKLOG) == -1) {
576                 DEBUG(0,("open_sockets_smbd: listen: "
577                         "%s\n", strerror(errno)));
578                         close(s->fd);
579                 TALLOC_FREE(s);
580                 return false;
581         }
582
583         s->fde = tevent_add_fd(smbd_event_context(),
584                                s,
585                                s->fd, TEVENT_FD_READ,
586                                smbd_accept_connection,
587                                s);
588         if (!s->fde) {
589                 DEBUG(0,("open_sockets_smbd: "
590                          "tevent_add_fd: %s\n",
591                          strerror(errno)));
592                 close(s->fd);
593                 TALLOC_FREE(s);
594                 return false;
595         }
596         tevent_fd_set_close_fn(s->fde, smbd_open_socket_close_fn);
597
598         DLIST_ADD_END(parent->sockets, s, struct smbd_open_socket *);
599
600         return true;
601 }
602
603 static bool smbd_parent_housekeeping(const struct timeval *now, void *private_data)
604 {
605         time_t printcap_cache_time = (time_t)lp_printcap_cache_time();
606         time_t t = time_mono(NULL);
607
608         DEBUG(5, ("parent housekeeping\n"));
609
610         /* if periodic printcap rescan is enabled, see if it's time to reload */
611         if ((printcap_cache_time != 0)
612          && (t >= (last_printer_reload_time + printcap_cache_time))) {
613                 DEBUG( 3,( "Printcap cache time expired.\n"));
614                 pcap_cache_reload(server_event_context(),
615                                   smbd_messaging_context(),
616                                   &reload_pcap_change_notify);
617                 last_printer_reload_time = t;
618         }
619
620         return true;
621 }
622
623 /****************************************************************************
624  Open the socket communication.
625 ****************************************************************************/
626
627 static bool open_sockets_smbd(struct smbd_parent_context *parent,
628                               struct messaging_context *msg_ctx,
629                               const char *smb_ports)
630 {
631         int num_interfaces = iface_count();
632         int i;
633         char *ports;
634         unsigned dns_port = 0;
635
636 #ifdef HAVE_ATEXIT
637         atexit(killkids);
638 #endif
639
640         /* Stop zombies */
641         smbd_setup_sig_chld_handler();
642
643         /* use a reasonable default set of ports - listing on 445 and 139 */
644         if (!smb_ports) {
645                 ports = lp_smb_ports();
646                 if (!ports || !*ports) {
647                         ports = talloc_strdup(talloc_tos(), SMB_PORTS);
648                 } else {
649                         ports = talloc_strdup(talloc_tos(), ports);
650                 }
651         } else {
652                 ports = talloc_strdup(talloc_tos(), smb_ports);
653         }
654
655         if (lp_interfaces() && lp_bind_interfaces_only()) {
656                 /* We have been given an interfaces line, and been
657                    told to only bind to those interfaces. Create a
658                    socket per interface and bind to only these.
659                 */
660
661                 /* Now open a listen socket for each of the
662                    interfaces. */
663                 for(i = 0; i < num_interfaces; i++) {
664                         const struct sockaddr_storage *ifss =
665                                         iface_n_sockaddr_storage(i);
666                         char *tok;
667                         const char *ptr;
668
669                         if (ifss == NULL) {
670                                 DEBUG(0,("open_sockets_smbd: "
671                                         "interface %d has NULL IP address !\n",
672                                         i));
673                                 continue;
674                         }
675
676                         for (ptr=ports;
677                              next_token_talloc(talloc_tos(),&ptr, &tok, " \t,");) {
678                                 unsigned port = atoi(tok);
679                                 if (port == 0 || port > 0xffff) {
680                                         continue;
681                                 }
682
683                                 if (!smbd_open_one_socket(parent, ifss, port)) {
684                                         return false;
685                                 }
686                         }
687                 }
688         } else {
689                 /* Just bind to 0.0.0.0 - accept connections
690                    from anywhere. */
691
692                 char *tok;
693                 const char *ptr;
694                 const char *sock_addr = lp_socket_address();
695                 char *sock_tok;
696                 const char *sock_ptr;
697
698                 if (strequal(sock_addr, "0.0.0.0") ||
699                     strequal(sock_addr, "::")) {
700 #if HAVE_IPV6
701                         sock_addr = "::,0.0.0.0";
702 #else
703                         sock_addr = "0.0.0.0";
704 #endif
705                 }
706
707                 for (sock_ptr=sock_addr;
708                      next_token_talloc(talloc_tos(), &sock_ptr, &sock_tok, " \t,"); ) {
709                         for (ptr=ports; next_token_talloc(talloc_tos(), &ptr, &tok, " \t,"); ) {
710                                 struct sockaddr_storage ss;
711
712                                 unsigned port = atoi(tok);
713                                 if (port == 0 || port > 0xffff) {
714                                         continue;
715                                 }
716
717                                 /* Keep the first port for mDNS service
718                                  * registration.
719                                  */
720                                 if (dns_port == 0) {
721                                         dns_port = port;
722                                 }
723
724                                 /* open an incoming socket */
725                                 if (!interpret_string_addr(&ss, sock_tok,
726                                                 AI_NUMERICHOST|AI_PASSIVE)) {
727                                         continue;
728                                 }
729
730                                 if (!smbd_open_one_socket(parent, &ss, port)) {
731                                         return false;
732                                 }
733                         }
734                 }
735         }
736
737         if (parent->sockets == NULL) {
738                 DEBUG(0,("open_sockets_smbd: No "
739                         "sockets available to bind to.\n"));
740                 return false;
741         }
742
743         /* Setup the main smbd so that we can get messages. Note that
744            do this after starting listening. This is needed as when in
745            clustered mode, ctdb won't allow us to start doing database
746            operations until it has gone thru a full startup, which
747            includes checking to see that smbd is listening. */
748
749         if (!serverid_register(procid_self(),
750                                FLAG_MSG_GENERAL|FLAG_MSG_SMBD
751                                |FLAG_MSG_DBWRAP)) {
752                 DEBUG(0, ("open_sockets_smbd: Failed to register "
753                           "myself in serverid.tdb\n"));
754                 return false;
755         }
756
757         if (!(event_add_idle(smbd_event_context(), NULL,
758                              timeval_set(SMBD_HOUSEKEEPING_INTERVAL, 0),
759                              "parent_housekeeping", smbd_parent_housekeeping,
760                              NULL))) {
761                 DEBUG(0, ("Could not add parent_housekeeping event\n"));
762                 return false;
763         }
764
765         /* Listen to messages */
766
767         messaging_register(msg_ctx, NULL, MSG_SMB_SAM_SYNC, msg_sam_sync);
768         messaging_register(msg_ctx, NULL, MSG_SHUTDOWN, msg_exit_server);
769         messaging_register(msg_ctx, NULL, MSG_SMB_FILE_RENAME,
770                            msg_file_was_renamed);
771         messaging_register(msg_ctx, server_event_context(), MSG_SMB_CONF_UPDATED,
772                            smb_conf_updated);
773         messaging_register(msg_ctx, NULL, MSG_SMB_STAT_CACHE_DELETE,
774                            smb_stat_cache_delete);
775         messaging_register(msg_ctx, NULL, MSG_DEBUG, smbd_msg_debug);
776         messaging_register(msg_ctx, server_event_context(), MSG_PRINTER_PCAP,
777                            smb_pcap_updated);
778         brl_register_msgs(msg_ctx);
779
780         msg_idmap_register_msgs(msg_ctx);
781
782 #ifdef CLUSTER_SUPPORT
783         if (lp_clustering()) {
784                 ctdbd_register_reconfigure(messaging_ctdbd_connection());
785         }
786 #endif
787
788 #ifdef DEVELOPER
789         messaging_register(msg_ctx, NULL, MSG_SMB_INJECT_FAULT,
790                            msg_inject_fault);
791 #endif
792
793         if (lp_multicast_dns_register() && (dns_port != 0)) {
794 #ifdef WITH_DNSSD_SUPPORT
795                 smbd_setup_mdns_registration(smbd_event_context(),
796                                              parent, dns_port);
797 #endif
798 #ifdef WITH_AVAHI_SUPPORT
799                 void *avahi_conn;
800
801                 avahi_conn = avahi_start_register(
802                         smbd_event_context(), smbd_event_context(), dns_port);
803                 if (avahi_conn == NULL) {
804                         DEBUG(10, ("avahi_start_register failed\n"));
805                 }
806 #endif
807         }
808
809         return true;
810 }
811
812 static void smbd_parent_loop(struct smbd_parent_context *parent)
813 {
814         /* now accept incoming connections - forking a new process
815            for each incoming connection */
816         DEBUG(2,("waiting for connections\n"));
817         while (1) {
818                 int ret;
819                 TALLOC_CTX *frame = talloc_stackframe();
820
821                 ret = tevent_loop_once(smbd_event_context());
822                 if (ret != 0) {
823                         exit_server_cleanly("tevent_loop_once() error");
824                 }
825
826                 TALLOC_FREE(frame);
827         } /* end while 1 */
828
829 /* NOTREACHED   return True; */
830 }
831
832
833 /****************************************************************************
834  Initialise connect, service and file structs.
835 ****************************************************************************/
836
837 static bool init_structs(void )
838 {
839         /*
840          * Set the machine NETBIOS name if not already
841          * set from the config file.
842          */
843
844         if (!init_names())
845                 return False;
846
847         if (!secrets_init())
848                 return False;
849
850         return True;
851 }
852
853 /****************************************************************************
854  main program.
855 ****************************************************************************/
856
857 /* Declare prototype for build_options() to avoid having to run it through
858    mkproto.h.  Mixing $(builddir) and $(srcdir) source files in the current
859    prototype generation system is too complicated. */
860
861 extern void build_options(bool screen);
862
863  int main(int argc,const char *argv[])
864 {
865         /* shall I run as a daemon */
866         bool is_daemon = false;
867         bool interactive = false;
868         bool Fork = true;
869         bool no_process_group = false;
870         bool log_stdout = false;
871         char *ports = NULL;
872         char *profile_level = NULL;
873         int opt;
874         poptContext pc;
875         bool print_build_options = False;
876         enum {
877                 OPT_DAEMON = 1000,
878                 OPT_INTERACTIVE,
879                 OPT_FORK,
880                 OPT_NO_PROCESS_GROUP,
881                 OPT_LOG_STDOUT
882         };
883         struct poptOption long_options[] = {
884         POPT_AUTOHELP
885         {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
886         {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)"},
887         {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools, etc.)" },
888         {"no-process-group", '\0', POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
889         {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
890         {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
891         {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
892         {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
893         POPT_COMMON_SAMBA
894         POPT_COMMON_DYNCONFIG
895         POPT_TABLEEND
896         };
897         struct smbd_parent_context *parent = NULL;
898         TALLOC_CTX *frame;
899         NTSTATUS status;
900         uint64_t unique_id;
901
902         /*
903          * Do this before any other talloc operation
904          */
905         talloc_enable_null_tracking();
906         frame = talloc_stackframe();
907
908         load_case_tables();
909
910         /* Initialize the event context, it will panic on error */
911         smbd_event_context();
912
913         smbd_init_globals();
914
915         TimeInit();
916
917 #ifdef HAVE_SET_AUTH_PARAMETERS
918         set_auth_parameters(argc,argv);
919 #endif
920
921         pc = poptGetContext("smbd", argc, argv, long_options, 0);
922         while((opt = poptGetNextOpt(pc)) != -1) {
923                 switch (opt)  {
924                 case OPT_DAEMON:
925                         is_daemon = true;
926                         break;
927                 case OPT_INTERACTIVE:
928                         interactive = true;
929                         break;
930                 case OPT_FORK:
931                         Fork = false;
932                         break;
933                 case OPT_NO_PROCESS_GROUP:
934                         no_process_group = true;
935                         break;
936                 case OPT_LOG_STDOUT:
937                         log_stdout = true;
938                         break;
939                 case 'b':
940                         print_build_options = True;
941                         break;
942                 default:
943                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
944                                   poptBadOption(pc, 0), poptStrerror(opt));
945                         poptPrintUsage(pc, stderr, 0);
946                         exit(1);
947                 }
948         }
949         poptFreeContext(pc);
950
951         if (interactive) {
952                 Fork = False;
953                 log_stdout = True;
954         }
955
956         if (log_stdout) {
957                 setup_logging(argv[0], DEBUG_STDOUT);
958         } else {
959                 setup_logging(argv[0], DEBUG_FILE);
960         }
961
962         if (print_build_options) {
963                 build_options(True); /* Display output to screen as well as debug */
964                 exit(0);
965         }
966
967 #ifdef HAVE_SETLUID
968         /* needed for SecureWare on SCO */
969         setluid(0);
970 #endif
971
972         set_remote_machine_name("smbd", False);
973
974         if (interactive && (DEBUGLEVEL >= 9)) {
975                 talloc_enable_leak_report();
976         }
977
978         if (log_stdout && Fork) {
979                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
980                 exit(1);
981         }
982
983         /* we want to re-seed early to prevent time delays causing
984            client problems at a later date. (tridge) */
985         generate_random_buffer(NULL, 0);
986
987         /* get initial effective uid and gid */
988         sec_init();
989
990         /* make absolutely sure we run as root - to handle cases where people
991            are crazy enough to have it setuid */
992         gain_root_privilege();
993         gain_root_group_privilege();
994
995         fault_setup();
996         dump_core_setup("smbd", lp_logfile());
997
998         /* we are never interested in SIGPIPE */
999         BlockSignals(True,SIGPIPE);
1000
1001 #if defined(SIGFPE)
1002         /* we are never interested in SIGFPE */
1003         BlockSignals(True,SIGFPE);
1004 #endif
1005
1006 #if defined(SIGUSR2)
1007         /* We are no longer interested in USR2 */
1008         BlockSignals(True,SIGUSR2);
1009 #endif
1010
1011         /* POSIX demands that signals are inherited. If the invoking process has
1012          * these signals masked, we will have problems, as we won't recieve them. */
1013         BlockSignals(False, SIGHUP);
1014         BlockSignals(False, SIGUSR1);
1015         BlockSignals(False, SIGTERM);
1016
1017         /* Ensure we leave no zombies until we
1018          * correctly set up child handling below. */
1019
1020         CatchChild();
1021
1022         /* we want total control over the permissions on created files,
1023            so set our umask to 0 */
1024         umask(0);
1025
1026         reopen_logs();
1027
1028         DEBUG(0,("smbd version %s started.\n", samba_version_string()));
1029         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1030
1031         DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
1032                  (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
1033
1034         /* Output the build options to the debug log */ 
1035         build_options(False);
1036
1037         if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
1038                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
1039                 exit(1);
1040         }
1041
1042         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1043                 DEBUG(0, ("error opening config file '%s'\n", get_dyn_CONFIGFILE()));
1044                 exit(1);
1045         }
1046
1047         /* Init the security context and global current_user */
1048         init_sec_ctx();
1049
1050         if (smbd_messaging_context() == NULL)
1051                 exit(1);
1052
1053         /*
1054          * Reloading of the printers will not work here as we don't have a
1055          * server info and rpc services set up. It will be called later.
1056          */
1057         if (!reload_services(smbd_messaging_context(), -1, False)) {
1058                 exit(1);
1059         }
1060
1061         /* ...NOTE... Log files are working from this point! */
1062
1063         DEBUG(3,("loaded services\n"));
1064
1065         init_structs();
1066
1067 #ifdef WITH_PROFILE
1068         if (!profile_setup(smbd_messaging_context(), False)) {
1069                 DEBUG(0,("ERROR: failed to setup profiling\n"));
1070                 return -1;
1071         }
1072         if (profile_level != NULL) {
1073                 int pl = atoi(profile_level);
1074                 struct server_id src;
1075
1076                 DEBUG(1, ("setting profiling level: %s\n",profile_level));
1077                 src.pid = getpid();
1078                 set_profile_level(pl, src);
1079         }
1080 #endif
1081
1082         if (!is_daemon && !is_a_socket(0)) {
1083                 if (!interactive)
1084                         DEBUG(0,("standard input is not a socket, assuming -D option\n"));
1085
1086                 /*
1087                  * Setting is_daemon here prevents us from eventually calling
1088                  * the open_sockets_inetd()
1089                  */
1090
1091                 is_daemon = True;
1092         }
1093
1094         if (is_daemon && !interactive) {
1095                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1096                 become_daemon(Fork, no_process_group, log_stdout);
1097         }
1098
1099         generate_random_buffer((uint8_t *)&unique_id, sizeof(unique_id));
1100         set_my_unique_id(unique_id);
1101
1102 #if HAVE_SETPGID
1103         /*
1104          * If we're interactive we want to set our own process group for
1105          * signal management.
1106          */
1107         if (interactive && !no_process_group)
1108                 setpgid( (pid_t)0, (pid_t)0);
1109 #endif
1110
1111         if (!directory_exist(lp_lockdir()))
1112                 mkdir(lp_lockdir(), 0755);
1113
1114         if (is_daemon)
1115                 pidfile_create("smbd");
1116
1117         status = reinit_after_fork(smbd_messaging_context(),
1118                                    smbd_event_context(),
1119                                    procid_self(), false);
1120         if (!NT_STATUS_IS_OK(status)) {
1121                 DEBUG(0,("reinit_after_fork() failed\n"));
1122                 exit(1);
1123         }
1124
1125         smbd_server_conn->msg_ctx = smbd_messaging_context();
1126
1127         smbd_setup_sig_term_handler();
1128         smbd_setup_sig_hup_handler(smbd_event_context(),
1129                                    smbd_server_conn->msg_ctx);
1130
1131         /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1132
1133         if (smbd_memcache() == NULL) {
1134                 exit(1);
1135         }
1136
1137         memcache_set_global(smbd_memcache());
1138
1139         /* Initialise the password backed before the global_sam_sid
1140            to ensure that we fetch from ldap before we make a domain sid up */
1141
1142         if(!initialize_password_db(False, smbd_event_context()))
1143                 exit(1);
1144
1145         if (!secrets_init()) {
1146                 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1147                 exit(1);
1148         }
1149
1150         if (lp_server_role() == ROLE_DOMAIN_BDC || lp_server_role() == ROLE_DOMAIN_PDC) {
1151                 if (!open_schannel_session_store(NULL, lp_private_dir())) {
1152                         DEBUG(0,("ERROR: Samba cannot open schannel store for secured NETLOGON operations.\n"));
1153                         exit(1);
1154                 }
1155         }
1156
1157         if(!get_global_sam_sid()) {
1158                 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1159                 exit(1);
1160         }
1161
1162         if (!sessionid_init()) {
1163                 exit(1);
1164         }
1165
1166         if (!connections_init(True))
1167                 exit(1);
1168
1169         if (!locking_init())
1170                 exit(1);
1171
1172         if (!messaging_tdb_parent_init(smbd_event_context())) {
1173                 exit(1);
1174         }
1175
1176         if (!notify_internal_parent_init(smbd_event_context())) {
1177                 exit(1);
1178         }
1179
1180         if (!serverid_parent_init(smbd_event_context())) {
1181                 exit(1);
1182         }
1183
1184         if (!printer_list_parent_init()) {
1185                 exit(1);
1186         }
1187
1188         if (!W_ERROR_IS_OK(registry_init_full()))
1189                 exit(1);
1190
1191         if (!print_backend_init(smbd_messaging_context()))
1192                 exit(1);
1193
1194         /* Open the share_info.tdb here, so we don't have to open
1195            after the fork on every single connection.  This is a small
1196            performance improvment and reduces the total number of system
1197            fds used. */
1198         if (!share_info_db_init()) {
1199                 DEBUG(0,("ERROR: failed to load share info db.\n"));
1200                 exit(1);
1201         }
1202
1203         status = init_system_info();
1204         if (!NT_STATUS_IS_OK(status)) {
1205                 DEBUG(1, ("ERROR: failed to setup system user info: %s.\n",
1206                           nt_errstr(status)));
1207                 return -1;
1208         }
1209
1210         if (!init_guest_info()) {
1211                 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1212                 return -1;
1213         }
1214
1215         if (!file_init(smbd_server_conn)) {
1216                 DEBUG(0, ("ERROR: file_init failed\n"));
1217                 return -1;
1218         }
1219
1220         if (is_daemon && !interactive) {
1221                 const char *rpcsrv_type;
1222
1223                 rpcsrv_type = lp_parm_const_string(GLOBAL_SECTION_SNUM,
1224                                                    "rpc_server", "epmapper",
1225                                                    "none");
1226                 if (StrCaseCmp(rpcsrv_type, "daemon") == 0) {
1227                         start_epmd(smbd_event_context(),
1228                                    smbd_server_conn->msg_ctx);
1229                 }
1230         }
1231
1232         if (!dcesrv_ep_setup(smbd_event_context(), smbd_server_conn->msg_ctx)) {
1233                 exit(1);
1234         }
1235
1236         /* Publish nt printers, this requires a working winreg pipe */
1237         pcap_cache_reload(server_event_context(), smbd_messaging_context(),
1238                           &reload_printers);
1239
1240         /* only start the background queue daemon if we are 
1241            running as a daemon -- bad things will happen if
1242            smbd is launched via inetd and we fork a copy of 
1243            ourselves here */
1244
1245         if (is_daemon && !interactive
1246             && lp_parm_bool(-1, "smbd", "backgroundqueue", true)) {
1247                 start_background_queue(smbd_event_context(),
1248                                        smbd_messaging_context());
1249         }
1250
1251         if (is_daemon && !_lp_disable_spoolss()) {
1252                 const char *rpcsrv_type;
1253
1254                 /* start spoolss daemon */
1255                 /* start as a separate daemon only if enabled */
1256                 rpcsrv_type = lp_parm_const_string(GLOBAL_SECTION_SNUM,
1257                                                    "rpc_server", "spoolss",
1258                                                    "embedded");
1259                 if (StrCaseCmp(rpcsrv_type, "daemon") == 0) {
1260                         start_spoolssd(smbd_event_context(),
1261                                        smbd_messaging_context());
1262                 }
1263         }
1264
1265         if (!is_daemon) {
1266                 /* inetd mode */
1267                 TALLOC_FREE(frame);
1268
1269                 /* Started from inetd. fd 0 is the socket. */
1270                 /* We will abort gracefully when the client or remote system
1271                    goes away */
1272                 smbd_set_server_fd(dup(0));
1273
1274                 /* close our standard file descriptors */
1275                 close_low_fds(False); /* Don't close stderr */
1276
1277 #ifdef HAVE_ATEXIT
1278                 atexit(killkids);
1279 #endif
1280
1281                 /* Stop zombies */
1282                 smbd_setup_sig_chld_handler();
1283
1284                 smbd_process(smbd_server_conn);
1285
1286                 exit_server_cleanly(NULL);
1287                 return(0);
1288         }
1289
1290         parent = talloc_zero(smbd_event_context(), struct smbd_parent_context);
1291         if (!parent) {
1292                 exit_server("talloc(struct smbd_parent_context) failed");
1293         }
1294         parent->interactive = interactive;
1295
1296         if (!open_sockets_smbd(parent, smbd_messaging_context(), ports))
1297                 exit_server("open_sockets_smbd() failed");
1298
1299         TALLOC_FREE(frame);
1300         /* make sure we always have a valid stackframe */
1301         frame = talloc_stackframe();
1302
1303         smbd_parent_loop(parent);
1304
1305         exit_server_cleanly(NULL);
1306         TALLOC_FREE(frame);
1307         return(0);
1308 }