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