a4857756a16c23b0919c4d6d3eb5874325604367
[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 "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 static void smbd_set_server_fd(int fd)
55 {
56         struct smbd_server_connection *sconn = smbd_server_conn;
57         char addr[INET6_ADDRSTRLEN];
58         const char *name;
59
60         sconn->sock = fd;
61
62         /*
63          * Initialize sconn->client_id: If we can't find the client's
64          * name, default to its address.
65          */
66
67         client_addr(fd, sconn->client_id.addr, sizeof(sconn->client_id.addr));
68
69         name = client_name(sconn->sock);
70         if (strcmp(name, "UNKNOWN") != 0) {
71                 name = talloc_strdup(sconn, name);
72         } else {
73                 name = NULL;
74         }
75         sconn->client_id.name =
76                 (name != NULL) ? name : sconn->client_id.addr;
77
78         sub_set_socket_ids(sconn->client_id.addr, sconn->client_id.name,
79                            client_socket_addr(sconn->sock, addr,
80                                               sizeof(addr)));
81 }
82
83 struct event_context *smbd_event_context(void)
84 {
85         return server_event_context();
86 }
87
88 /*******************************************************************
89  What to do when smb.conf is updated.
90  ********************************************************************/
91
92 static void smb_conf_updated(struct messaging_context *msg,
93                              void *private_data,
94                              uint32_t msg_type,
95                              struct server_id server_id,
96                              DATA_BLOB *data)
97 {
98         struct tevent_context *ev_ctx =
99                 talloc_get_type_abort(private_data, struct tevent_context);
100
101         DEBUG(10,("smb_conf_updated: Got message saying smb.conf was "
102                   "updated. Reloading.\n"));
103         change_to_root_user();
104         reload_services(msg, smbd_server_conn->sock, False);
105         if (am_parent) {
106                 pcap_cache_reload(ev_ctx, msg,
107                                   &reload_pcap_change_notify);
108         }
109 }
110
111 /*******************************************************************
112  What to do when printcap is updated.
113  ********************************************************************/
114
115 static void smb_pcap_updated(struct messaging_context *msg,
116                              void *private_data,
117                              uint32_t msg_type,
118                              struct server_id server_id,
119                              DATA_BLOB *data)
120 {
121         struct tevent_context *ev_ctx =
122                 talloc_get_type_abort(private_data, struct tevent_context);
123
124         DEBUG(10,("Got message saying pcap was updated. Reloading.\n"));
125         change_to_root_user();
126         reload_printers(ev_ctx, msg);
127 }
128
129 /*******************************************************************
130  Delete a statcache entry.
131  ********************************************************************/
132
133 static void smb_stat_cache_delete(struct messaging_context *msg,
134                                   void *private_data,
135                                   uint32_t msg_tnype,
136                                   struct server_id server_id,
137                                   DATA_BLOB *data)
138 {
139         const char *name = (const char *)data->data;
140         DEBUG(10,("smb_stat_cache_delete: delete name %s\n", name));
141         stat_cache_delete(name);
142 }
143
144 /****************************************************************************
145   Send a SIGTERM to our process group.
146 *****************************************************************************/
147
148 static void  killkids(void)
149 {
150         if(am_parent) kill(0,SIGTERM);
151 }
152
153 /****************************************************************************
154  Process a sam sync message - not sure whether to do this here or
155  somewhere else.
156 ****************************************************************************/
157
158 static void msg_sam_sync(struct messaging_context *msg,
159                          void *private_data,
160                          uint32_t msg_type,
161                          struct server_id server_id,
162                          DATA_BLOB *data)
163 {
164         DEBUG(10, ("** sam sync message received, ignoring\n"));
165 }
166
167 static void msg_exit_server(struct messaging_context *msg,
168                             void *private_data,
169                             uint32_t msg_type,
170                             struct server_id server_id,
171                             DATA_BLOB *data)
172 {
173         DEBUG(3, ("got a SHUTDOWN message\n"));
174         exit_server_cleanly(NULL);
175 }
176
177 #ifdef DEVELOPER
178 static void msg_inject_fault(struct messaging_context *msg,
179                              void *private_data,
180                              uint32_t msg_type,
181                              struct server_id src,
182                              DATA_BLOB *data)
183 {
184         int sig;
185
186         if (data->length != sizeof(sig)) {
187                 DEBUG(0, ("Process %s sent bogus signal injection request\n",
188                           procid_str_static(&src)));
189                 return;
190         }
191
192         sig = *(int *)data->data;
193         if (sig == -1) {
194                 exit_server("internal error injected");
195                 return;
196         }
197
198 #if HAVE_STRSIGNAL
199         DEBUG(0, ("Process %s requested injection of signal %d (%s)\n",
200                   procid_str_static(&src), sig, strsignal(sig)));
201 #else
202         DEBUG(0, ("Process %s requested injection of signal %d\n",
203                   procid_str_static(&src), sig));
204 #endif
205
206         kill(sys_getpid(), sig);
207 }
208 #endif /* DEVELOPER */
209
210 /*
211  * Parent smbd process sets its own debug level first and then
212  * sends a message to all the smbd children to adjust their debug
213  * level to that of the parent.
214  */
215
216 static void smbd_msg_debug(struct messaging_context *msg_ctx,
217                            void *private_data,
218                            uint32_t msg_type,
219                            struct server_id server_id,
220                            DATA_BLOB *data)
221 {
222         struct child_pid *child;
223
224         debug_message(msg_ctx, private_data, MSG_DEBUG, server_id, data);
225
226         for (child = children; child != NULL; child = child->next) {
227                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
228                                    MSG_DEBUG,
229                                    data->data,
230                                    strlen((char *) data->data) + 1);
231         }
232 }
233
234 static void add_child_pid(pid_t pid)
235 {
236         struct child_pid *child;
237
238         child = SMB_MALLOC_P(struct child_pid);
239         if (child == NULL) {
240                 DEBUG(0, ("Could not add child struct -- malloc failed\n"));
241                 return;
242         }
243         child->pid = pid;
244         DLIST_ADD(children, child);
245         num_children += 1;
246 }
247
248 /*
249   at most every smbd:cleanuptime seconds (default 20), we scan the BRL
250   and locking database for entries to cleanup. As a side effect this
251   also cleans up dead entries in the connections database (due to the
252   traversal in message_send_all()
253
254   Using a timer for this prevents a flood of traversals when a large
255   number of clients disconnect at the same time (perhaps due to a
256   network outage).  
257 */
258
259 static void cleanup_timeout_fn(struct event_context *event_ctx,
260                                 struct timed_event *te,
261                                 struct timeval now,
262                                 void *private_data)
263 {
264         struct timed_event **cleanup_te = (struct timed_event **)private_data;
265
266         DEBUG(1,("Cleaning up brl and lock database after unclean shutdown\n"));
267         message_send_all(smbd_messaging_context(), MSG_SMB_UNLOCK, NULL, 0, NULL);
268         messaging_send_buf(smbd_messaging_context(), procid_self(),
269                                 MSG_SMB_BRL_VALIDATE, NULL, 0);
270         /* mark the cleanup as having been done */
271         (*cleanup_te) = NULL;
272 }
273
274 static void remove_child_pid(pid_t pid, bool unclean_shutdown)
275 {
276         struct child_pid *child;
277         static struct timed_event *cleanup_te;
278         struct server_id child_id;
279
280         if (unclean_shutdown) {
281                 /* a child terminated uncleanly so tickle all
282                    processes to see if they can grab any of the
283                    pending locks
284                 */
285                 DEBUG(3,(__location__ " Unclean shutdown of pid %u\n",
286                         (unsigned int)pid));
287                 if (!cleanup_te) {
288                         /* call the cleanup timer, but not too often */
289                         int cleanup_time = lp_parm_int(-1, "smbd", "cleanuptime", 20);
290                         cleanup_te = event_add_timed(smbd_event_context(), NULL,
291                                                 timeval_current_ofs(cleanup_time, 0),
292                                                 cleanup_timeout_fn,
293                                                 &cleanup_te);
294                         DEBUG(1,("Scheduled cleanup of brl and lock database after unclean shutdown\n"));
295                 }
296         }
297
298         child_id = procid_self(); /* Just initialize pid and potentially vnn */
299         child_id.pid = pid;
300
301         if (!serverid_deregister(child_id)) {
302                 DEBUG(1, ("Could not remove pid %d from serverid.tdb\n",
303                           (int)pid));
304         }
305
306         for (child = children; child != NULL; child = child->next) {
307                 if (child->pid == pid) {
308                         struct child_pid *tmp = child;
309                         DLIST_REMOVE(children, child);
310                         SAFE_FREE(tmp);
311                         num_children -= 1;
312                         return;
313                 }
314         }
315
316         /* not all forked child processes are added to the children list */
317         DEBUG(1, ("Could not find child %d -- ignoring\n", (int)pid));
318 }
319
320 /****************************************************************************
321  Have we reached the process limit ?
322 ****************************************************************************/
323
324 static bool allowable_number_of_smbd_processes(void)
325 {
326         int max_processes = lp_max_smbd_processes();
327
328         if (!max_processes)
329                 return True;
330
331         return num_children < max_processes;
332 }
333
334 static void smbd_sig_chld_handler(struct tevent_context *ev,
335                                   struct tevent_signal *se,
336                                   int signum,
337                                   int count,
338                                   void *siginfo,
339                                   void *private_data)
340 {
341         pid_t pid;
342         int status;
343
344         while ((pid = sys_waitpid(-1, &status, WNOHANG)) > 0) {
345                 bool unclean_shutdown = False;
346
347                 /* If the child terminated normally, assume
348                    it was an unclean shutdown unless the
349                    status is 0
350                 */
351                 if (WIFEXITED(status)) {
352                         unclean_shutdown = WEXITSTATUS(status);
353                 }
354                 /* If the child terminated due to a signal
355                    we always assume it was unclean.
356                 */
357                 if (WIFSIGNALED(status)) {
358                         unclean_shutdown = True;
359                 }
360                 remove_child_pid(pid, unclean_shutdown);
361         }
362 }
363
364 static void smbd_setup_sig_chld_handler(void)
365 {
366         struct tevent_signal *se;
367
368         se = tevent_add_signal(smbd_event_context(),
369                                smbd_event_context(),
370                                SIGCHLD, 0,
371                                smbd_sig_chld_handler,
372                                NULL);
373         if (!se) {
374                 exit_server("failed to setup SIGCHLD handler");
375         }
376 }
377
378 struct smbd_open_socket;
379
380 struct smbd_parent_context {
381         bool interactive;
382
383         /* the list of listening sockets */
384         struct smbd_open_socket *sockets;
385 };
386
387 struct smbd_open_socket {
388         struct smbd_open_socket *prev, *next;
389         struct smbd_parent_context *parent;
390         int fd;
391         struct tevent_fd *fde;
392 };
393
394 static void smbd_open_socket_close_fn(struct tevent_context *ev,
395                                       struct tevent_fd *fde,
396                                       int fd,
397                                       void *private_data)
398 {
399         /* this might be the socket_wrapper swrap_close() */
400         close(fd);
401 }
402
403 static void smbd_accept_connection(struct tevent_context *ev,
404                                    struct tevent_fd *fde,
405                                    uint16_t flags,
406                                    void *private_data)
407 {
408         struct smbd_open_socket *s = talloc_get_type_abort(private_data,
409                                      struct smbd_open_socket);
410         struct sockaddr_storage addr;
411         socklen_t in_addrlen = sizeof(addr);
412         int fd;
413         pid_t pid = 0;
414         uint64_t unique_id;
415
416         fd = accept(s->fd, (struct sockaddr *)(void *)&addr,&in_addrlen);
417         smbd_set_server_fd(fd);
418
419         if (fd == -1 && errno == EINTR)
420                 return;
421
422         if (fd == -1) {
423                 DEBUG(0,("open_sockets_smbd: accept: %s\n",
424                          strerror(errno)));
425                 return;
426         }
427
428         if (s->parent->interactive) {
429                 smbd_process(smbd_server_conn);
430                 exit_server_cleanly("end of interactive mode");
431                 return;
432         }
433
434         if (!allowable_number_of_smbd_processes()) {
435                 close(fd);
436                 smbd_set_server_fd(-1);
437                 return;
438         }
439
440         /*
441          * Generate a unique id in the parent process so that we use
442          * the global random state in the parent.
443          */
444         generate_random_buffer((uint8_t *)&unique_id, sizeof(unique_id));
445
446         pid = sys_fork();
447         if (pid == 0) {
448                 NTSTATUS status = NT_STATUS_OK;
449
450                 /* Child code ... */
451                 am_parent = 0;
452
453                 set_my_unique_id(unique_id);
454
455                 /* Stop zombies, the parent explicitly handles
456                  * them, counting worker smbds. */
457                 CatchChild();
458
459                 /* close our standard file
460                    descriptors */
461                 close_low_fds(False);
462
463                 /*
464                  * Can't use TALLOC_FREE here. Nulling out the argument to it
465                  * would overwrite memory we've just freed.
466                  */
467                 talloc_free(s->parent);
468                 s = NULL;
469
470                 status = reinit_after_fork(smbd_messaging_context(),
471                                            smbd_event_context(), procid_self(),
472                                            true);
473                 if (!NT_STATUS_IS_OK(status)) {
474                         if (NT_STATUS_EQUAL(status,
475                                             NT_STATUS_TOO_MANY_OPENED_FILES)) {
476                                 DEBUG(0,("child process cannot initialize "
477                                          "because too many files are open\n"));
478                                 goto exit;
479                         }
480                         DEBUG(0,("reinit_after_fork() failed\n"));
481                         smb_panic("reinit_after_fork() failed");
482                 }
483
484                 smbd_setup_sig_term_handler();
485                 smbd_setup_sig_hup_handler(server_event_context(),
486                                            server_messaging_context());
487
488                 if (!serverid_register(procid_self(),
489                                        FLAG_MSG_GENERAL|FLAG_MSG_SMBD
490                                        |FLAG_MSG_DBWRAP
491                                        |FLAG_MSG_PRINT_GENERAL)) {
492                         exit_server_cleanly("Could not register myself in "
493                                             "serverid.tdb");
494                 }
495
496                 smbd_process(smbd_server_conn);
497          exit:
498                 exit_server_cleanly("end of child");
499                 return;
500         }
501
502         if (pid < 0) {
503                 DEBUG(0,("smbd_accept_connection: sys_fork() failed: %s\n",
504                          strerror(errno)));
505         }
506
507         /* The parent doesn't need this socket */
508         close(fd);
509
510         /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
511                 Clear the closed fd info out of server_fd --
512                 and more importantly, out of client_fd in
513                 util_sock.c, to avoid a possible
514                 getpeername failure if we reopen the logs
515                 and use %I in the filename.
516         */
517
518         smbd_set_server_fd(-1);
519
520         if (pid != 0) {
521                 add_child_pid(pid);
522         }
523
524         /* Force parent to check log size after
525          * spawning child.  Fix from
526          * klausr@ITAP.Physik.Uni-Stuttgart.De.  The
527          * parent smbd will log to logserver.smb.  It
528          * writes only two messages for each child
529          * started/finished. But each child writes,
530          * say, 50 messages also in logserver.smb,
531          * begining with the debug_count of the
532          * parent, before the child opens its own log
533          * file logserver.client. In a worst case
534          * scenario the size of logserver.smb would be
535          * checked after about 50*50=2500 messages
536          * (ca. 100kb).
537          * */
538         force_check_log_size();
539 }
540
541 static bool smbd_open_one_socket(struct smbd_parent_context *parent,
542                                  const struct sockaddr_storage *ifss,
543                                  uint16_t port)
544 {
545         struct smbd_open_socket *s;
546
547         s = talloc(parent, struct smbd_open_socket);
548         if (!s) {
549                 return false;
550         }
551
552         s->parent = parent;
553         s->fd = open_socket_in(SOCK_STREAM,
554                                port,
555                                parent->sockets == NULL ? 0 : 2,
556                                ifss,
557                                true);
558         if (s->fd == -1) {
559                 DEBUG(0,("smbd_open_once_socket: open_socket_in: "
560                         "%s\n", strerror(errno)));
561                 TALLOC_FREE(s);
562                 /*
563                  * We ignore an error here, as we've done before
564                  */
565                 return true;
566         }
567
568         /* ready to listen */
569         set_socket_options(s->fd, "SO_KEEPALIVE");
570         set_socket_options(s->fd, lp_socket_options());
571
572         /* Set server socket to
573          * non-blocking for the accept. */
574         set_blocking(s->fd, False);
575
576         if (listen(s->fd, SMBD_LISTEN_BACKLOG) == -1) {
577                 DEBUG(0,("open_sockets_smbd: listen: "
578                         "%s\n", strerror(errno)));
579                         close(s->fd);
580                 TALLOC_FREE(s);
581                 return false;
582         }
583
584         s->fde = tevent_add_fd(smbd_event_context(),
585                                s,
586                                s->fd, TEVENT_FD_READ,
587                                smbd_accept_connection,
588                                s);
589         if (!s->fde) {
590                 DEBUG(0,("open_sockets_smbd: "
591                          "tevent_add_fd: %s\n",
592                          strerror(errno)));
593                 close(s->fd);
594                 TALLOC_FREE(s);
595                 return false;
596         }
597         tevent_fd_set_close_fn(s->fde, smbd_open_socket_close_fn);
598
599         DLIST_ADD_END(parent->sockets, s, struct smbd_open_socket *);
600
601         return true;
602 }
603
604 static bool smbd_parent_housekeeping(const struct timeval *now, void *private_data)
605 {
606         time_t printcap_cache_time = (time_t)lp_printcap_cache_time();
607         time_t t = time_mono(NULL);
608
609         DEBUG(5, ("parent housekeeping\n"));
610
611         /* if periodic printcap rescan is enabled, see if it's time to reload */
612         if ((printcap_cache_time != 0)
613          && (t >= (last_printer_reload_time + printcap_cache_time))) {
614                 DEBUG( 3,( "Printcap cache time expired.\n"));
615                 pcap_cache_reload(server_event_context(),
616                                   smbd_messaging_context(),
617                                   &reload_pcap_change_notify);
618                 last_printer_reload_time = t;
619         }
620
621         return true;
622 }
623
624 /****************************************************************************
625  Open the socket communication.
626 ****************************************************************************/
627
628 static bool open_sockets_smbd(struct smbd_parent_context *parent,
629                               struct messaging_context *msg_ctx,
630                               const char *smb_ports)
631 {
632         int num_interfaces = iface_count();
633         int i;
634         char *ports;
635         unsigned dns_port = 0;
636
637 #ifdef HAVE_ATEXIT
638         atexit(killkids);
639 #endif
640
641         /* Stop zombies */
642         smbd_setup_sig_chld_handler();
643
644         /* use a reasonable default set of ports - listing on 445 and 139 */
645         if (!smb_ports) {
646                 ports = lp_smb_ports();
647                 if (!ports || !*ports) {
648                         ports = talloc_strdup(talloc_tos(), SMB_PORTS);
649                 } else {
650                         ports = talloc_strdup(talloc_tos(), ports);
651                 }
652         } else {
653                 ports = talloc_strdup(talloc_tos(), smb_ports);
654         }
655
656         if (lp_interfaces() && lp_bind_interfaces_only()) {
657                 /* We have been given an interfaces line, and been
658                    told to only bind to those interfaces. Create a
659                    socket per interface and bind to only these.
660                 */
661
662                 /* Now open a listen socket for each of the
663                    interfaces. */
664                 for(i = 0; i < num_interfaces; i++) {
665                         const struct sockaddr_storage *ifss =
666                                         iface_n_sockaddr_storage(i);
667                         char *tok;
668                         const char *ptr;
669
670                         if (ifss == NULL) {
671                                 DEBUG(0,("open_sockets_smbd: "
672                                         "interface %d has NULL IP address !\n",
673                                         i));
674                                 continue;
675                         }
676
677                         for (ptr=ports;
678                              next_token_talloc(talloc_tos(),&ptr, &tok, " \t,");) {
679                                 unsigned port = atoi(tok);
680                                 if (port == 0 || port > 0xffff) {
681                                         continue;
682                                 }
683
684                                 /* Keep the first port for mDNS service
685                                  * registration.
686                                  */
687                                 if (dns_port == 0) {
688                                         dns_port = port;
689                                 }
690
691                                 if (!smbd_open_one_socket(parent, ifss, port)) {
692                                         return false;
693                                 }
694                         }
695                 }
696         } else {
697                 /* Just bind to 0.0.0.0 - accept connections
698                    from anywhere. */
699
700                 char *tok;
701                 const char *ptr;
702                 const char *sock_addr = lp_socket_address();
703                 char *sock_tok;
704                 const char *sock_ptr;
705
706                 if (strequal(sock_addr, "0.0.0.0") ||
707                     strequal(sock_addr, "::")) {
708 #if HAVE_IPV6
709                         sock_addr = "::,0.0.0.0";
710 #else
711                         sock_addr = "0.0.0.0";
712 #endif
713                 }
714
715                 for (sock_ptr=sock_addr;
716                      next_token_talloc(talloc_tos(), &sock_ptr, &sock_tok, " \t,"); ) {
717                         for (ptr=ports; next_token_talloc(talloc_tos(), &ptr, &tok, " \t,"); ) {
718                                 struct sockaddr_storage ss;
719
720                                 unsigned port = atoi(tok);
721                                 if (port == 0 || port > 0xffff) {
722                                         continue;
723                                 }
724
725                                 /* Keep the first port for mDNS service
726                                  * registration.
727                                  */
728                                 if (dns_port == 0) {
729                                         dns_port = port;
730                                 }
731
732                                 /* open an incoming socket */
733                                 if (!interpret_string_addr(&ss, sock_tok,
734                                                 AI_NUMERICHOST|AI_PASSIVE)) {
735                                         continue;
736                                 }
737
738                                 if (!smbd_open_one_socket(parent, &ss, port)) {
739                                         return false;
740                                 }
741                         }
742                 }
743         }
744
745         if (parent->sockets == NULL) {
746                 DEBUG(0,("open_sockets_smbd: No "
747                         "sockets available to bind to.\n"));
748                 return false;
749         }
750
751         /* Setup the main smbd so that we can get messages. Note that
752            do this after starting listening. This is needed as when in
753            clustered mode, ctdb won't allow us to start doing database
754            operations until it has gone thru a full startup, which
755            includes checking to see that smbd is listening. */
756
757         if (!serverid_register(procid_self(),
758                                FLAG_MSG_GENERAL|FLAG_MSG_SMBD
759                                |FLAG_MSG_DBWRAP)) {
760                 DEBUG(0, ("open_sockets_smbd: Failed to register "
761                           "myself in serverid.tdb\n"));
762                 return false;
763         }
764
765         if (!(event_add_idle(smbd_event_context(), NULL,
766                              timeval_set(SMBD_HOUSEKEEPING_INTERVAL, 0),
767                              "parent_housekeeping", smbd_parent_housekeeping,
768                              NULL))) {
769                 DEBUG(0, ("Could not add parent_housekeeping event\n"));
770                 return false;
771         }
772
773         /* Listen to messages */
774
775         messaging_register(msg_ctx, NULL, MSG_SMB_SAM_SYNC, msg_sam_sync);
776         messaging_register(msg_ctx, NULL, MSG_SHUTDOWN, msg_exit_server);
777         messaging_register(msg_ctx, NULL, MSG_SMB_FILE_RENAME,
778                            msg_file_was_renamed);
779         messaging_register(msg_ctx, server_event_context(), MSG_SMB_CONF_UPDATED,
780                            smb_conf_updated);
781         messaging_register(msg_ctx, NULL, MSG_SMB_STAT_CACHE_DELETE,
782                            smb_stat_cache_delete);
783         messaging_register(msg_ctx, NULL, MSG_DEBUG, smbd_msg_debug);
784         messaging_register(msg_ctx, server_event_context(), MSG_PRINTER_PCAP,
785                            smb_pcap_updated);
786         brl_register_msgs(msg_ctx);
787
788         msg_idmap_register_msgs(msg_ctx);
789
790 #ifdef CLUSTER_SUPPORT
791         if (lp_clustering()) {
792                 ctdbd_register_reconfigure(messaging_ctdbd_connection());
793         }
794 #endif
795
796 #ifdef DEVELOPER
797         messaging_register(msg_ctx, NULL, MSG_SMB_INJECT_FAULT,
798                            msg_inject_fault);
799 #endif
800
801         if (lp_multicast_dns_register() && (dns_port != 0)) {
802 #ifdef WITH_DNSSD_SUPPORT
803                 smbd_setup_mdns_registration(smbd_event_context(),
804                                              parent, dns_port);
805 #endif
806 #ifdef WITH_AVAHI_SUPPORT
807                 void *avahi_conn;
808
809                 avahi_conn = avahi_start_register(
810                         smbd_event_context(), smbd_event_context(), dns_port);
811                 if (avahi_conn == NULL) {
812                         DEBUG(10, ("avahi_start_register failed\n"));
813                 }
814 #endif
815         }
816
817         return true;
818 }
819
820 static void smbd_parent_loop(struct smbd_parent_context *parent)
821 {
822         /* now accept incoming connections - forking a new process
823            for each incoming connection */
824         DEBUG(2,("waiting for connections\n"));
825         while (1) {
826                 int ret;
827                 TALLOC_CTX *frame = talloc_stackframe();
828
829                 ret = tevent_loop_once(smbd_event_context());
830                 if (ret != 0) {
831                         exit_server_cleanly("tevent_loop_once() error");
832                 }
833
834                 TALLOC_FREE(frame);
835         } /* end while 1 */
836
837 /* NOTREACHED   return True; */
838 }
839
840
841 /****************************************************************************
842  Initialise connect, service and file structs.
843 ****************************************************************************/
844
845 static bool init_structs(void )
846 {
847         /*
848          * Set the machine NETBIOS name if not already
849          * set from the config file.
850          */
851
852         if (!init_names())
853                 return False;
854
855         if (!secrets_init())
856                 return False;
857
858         return True;
859 }
860
861 /****************************************************************************
862  main program.
863 ****************************************************************************/
864
865 /* Declare prototype for build_options() to avoid having to run it through
866    mkproto.h.  Mixing $(builddir) and $(srcdir) source files in the current
867    prototype generation system is too complicated. */
868
869 extern void build_options(bool screen);
870
871  int main(int argc,const char *argv[])
872 {
873         /* shall I run as a daemon */
874         bool is_daemon = false;
875         bool interactive = false;
876         bool Fork = true;
877         bool no_process_group = false;
878         bool log_stdout = false;
879         char *ports = NULL;
880         char *profile_level = NULL;
881         int opt;
882         poptContext pc;
883         bool print_build_options = False;
884         enum {
885                 OPT_DAEMON = 1000,
886                 OPT_INTERACTIVE,
887                 OPT_FORK,
888                 OPT_NO_PROCESS_GROUP,
889                 OPT_LOG_STDOUT
890         };
891         struct poptOption long_options[] = {
892         POPT_AUTOHELP
893         {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
894         {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)"},
895         {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools, etc.)" },
896         {"no-process-group", '\0', POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
897         {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
898         {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
899         {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
900         {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
901         POPT_COMMON_SAMBA
902         POPT_COMMON_DYNCONFIG
903         POPT_TABLEEND
904         };
905         struct smbd_parent_context *parent = NULL;
906         TALLOC_CTX *frame;
907         NTSTATUS status;
908         uint64_t unique_id;
909
910         /*
911          * Do this before any other talloc operation
912          */
913         talloc_enable_null_tracking();
914         frame = talloc_stackframe();
915
916         load_case_tables();
917
918         /* Initialize the event context, it will panic on error */
919         smbd_event_context();
920
921         smbd_init_globals();
922
923         TimeInit();
924
925 #ifdef HAVE_SET_AUTH_PARAMETERS
926         set_auth_parameters(argc,argv);
927 #endif
928
929         pc = poptGetContext("smbd", argc, argv, long_options, 0);
930         while((opt = poptGetNextOpt(pc)) != -1) {
931                 switch (opt)  {
932                 case OPT_DAEMON:
933                         is_daemon = true;
934                         break;
935                 case OPT_INTERACTIVE:
936                         interactive = true;
937                         break;
938                 case OPT_FORK:
939                         Fork = false;
940                         break;
941                 case OPT_NO_PROCESS_GROUP:
942                         no_process_group = true;
943                         break;
944                 case OPT_LOG_STDOUT:
945                         log_stdout = true;
946                         break;
947                 case 'b':
948                         print_build_options = True;
949                         break;
950                 default:
951                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
952                                   poptBadOption(pc, 0), poptStrerror(opt));
953                         poptPrintUsage(pc, stderr, 0);
954                         exit(1);
955                 }
956         }
957         poptFreeContext(pc);
958
959         if (interactive) {
960                 Fork = False;
961                 log_stdout = True;
962         }
963
964         if (log_stdout) {
965                 setup_logging(argv[0], DEBUG_STDOUT);
966         } else {
967                 setup_logging(argv[0], DEBUG_FILE);
968         }
969
970         if (print_build_options) {
971                 build_options(True); /* Display output to screen as well as debug */
972                 exit(0);
973         }
974
975 #ifdef HAVE_SETLUID
976         /* needed for SecureWare on SCO */
977         setluid(0);
978 #endif
979
980         set_remote_machine_name("smbd", False);
981
982         if (interactive && (DEBUGLEVEL >= 9)) {
983                 talloc_enable_leak_report();
984         }
985
986         if (log_stdout && Fork) {
987                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
988                 exit(1);
989         }
990
991         /* we want to re-seed early to prevent time delays causing
992            client problems at a later date. (tridge) */
993         generate_random_buffer(NULL, 0);
994
995         /* get initial effective uid and gid */
996         sec_init();
997
998         /* make absolutely sure we run as root - to handle cases where people
999            are crazy enough to have it setuid */
1000         gain_root_privilege();
1001         gain_root_group_privilege();
1002
1003         fault_setup();
1004         dump_core_setup("smbd", lp_logfile());
1005
1006         /* we are never interested in SIGPIPE */
1007         BlockSignals(True,SIGPIPE);
1008
1009 #if defined(SIGFPE)
1010         /* we are never interested in SIGFPE */
1011         BlockSignals(True,SIGFPE);
1012 #endif
1013
1014 #if defined(SIGUSR2)
1015         /* We are no longer interested in USR2 */
1016         BlockSignals(True,SIGUSR2);
1017 #endif
1018
1019         /* POSIX demands that signals are inherited. If the invoking process has
1020          * these signals masked, we will have problems, as we won't recieve them. */
1021         BlockSignals(False, SIGHUP);
1022         BlockSignals(False, SIGUSR1);
1023         BlockSignals(False, SIGTERM);
1024
1025         /* Ensure we leave no zombies until we
1026          * correctly set up child handling below. */
1027
1028         CatchChild();
1029
1030         /* we want total control over the permissions on created files,
1031            so set our umask to 0 */
1032         umask(0);
1033
1034         reopen_logs();
1035
1036         DEBUG(0,("smbd version %s started.\n", samba_version_string()));
1037         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1038
1039         DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
1040                  (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
1041
1042         /* Output the build options to the debug log */ 
1043         build_options(False);
1044
1045         if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
1046                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
1047                 exit(1);
1048         }
1049
1050         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1051                 DEBUG(0, ("error opening config file '%s'\n", get_dyn_CONFIGFILE()));
1052                 exit(1);
1053         }
1054
1055         /* Init the security context and global current_user */
1056         init_sec_ctx();
1057
1058         if (smbd_messaging_context() == NULL)
1059                 exit(1);
1060
1061         /*
1062          * Reloading of the printers will not work here as we don't have a
1063          * server info and rpc services set up. It will be called later.
1064          */
1065         if (!reload_services(smbd_messaging_context(), -1, False)) {
1066                 exit(1);
1067         }
1068
1069         /* ...NOTE... Log files are working from this point! */
1070
1071         DEBUG(3,("loaded services\n"));
1072
1073         init_structs();
1074
1075 #ifdef WITH_PROFILE
1076         if (!profile_setup(smbd_messaging_context(), False)) {
1077                 DEBUG(0,("ERROR: failed to setup profiling\n"));
1078                 return -1;
1079         }
1080         if (profile_level != NULL) {
1081                 int pl = atoi(profile_level);
1082                 struct server_id src;
1083
1084                 DEBUG(1, ("setting profiling level: %s\n",profile_level));
1085                 src.pid = getpid();
1086                 set_profile_level(pl, src);
1087         }
1088 #endif
1089
1090         if (!is_daemon && !is_a_socket(0)) {
1091                 if (!interactive)
1092                         DEBUG(0,("standard input is not a socket, assuming -D option\n"));
1093
1094                 /*
1095                  * Setting is_daemon here prevents us from eventually calling
1096                  * the open_sockets_inetd()
1097                  */
1098
1099                 is_daemon = True;
1100         }
1101
1102         if (is_daemon && !interactive) {
1103                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1104                 become_daemon(Fork, no_process_group, log_stdout);
1105         }
1106
1107         generate_random_buffer((uint8_t *)&unique_id, sizeof(unique_id));
1108         set_my_unique_id(unique_id);
1109
1110 #if HAVE_SETPGID
1111         /*
1112          * If we're interactive we want to set our own process group for
1113          * signal management.
1114          */
1115         if (interactive && !no_process_group)
1116                 setpgid( (pid_t)0, (pid_t)0);
1117 #endif
1118
1119         if (!directory_exist(lp_lockdir()))
1120                 mkdir(lp_lockdir(), 0755);
1121
1122         if (is_daemon)
1123                 pidfile_create("smbd");
1124
1125         status = reinit_after_fork(smbd_messaging_context(),
1126                                    smbd_event_context(),
1127                                    procid_self(), false);
1128         if (!NT_STATUS_IS_OK(status)) {
1129                 DEBUG(0,("reinit_after_fork() failed\n"));
1130                 exit(1);
1131         }
1132
1133         smbd_server_conn->msg_ctx = smbd_messaging_context();
1134
1135         smbd_setup_sig_term_handler();
1136         smbd_setup_sig_hup_handler(smbd_event_context(),
1137                                    smbd_server_conn->msg_ctx);
1138
1139         /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1140
1141         if (smbd_memcache() == NULL) {
1142                 exit(1);
1143         }
1144
1145         memcache_set_global(smbd_memcache());
1146
1147         /* Initialise the password backed before the global_sam_sid
1148            to ensure that we fetch from ldap before we make a domain sid up */
1149
1150         if(!initialize_password_db(False, smbd_event_context()))
1151                 exit(1);
1152
1153         if (!secrets_init()) {
1154                 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1155                 exit(1);
1156         }
1157
1158         if (lp_server_role() == ROLE_DOMAIN_BDC || lp_server_role() == ROLE_DOMAIN_PDC) {
1159                 if (!open_schannel_session_store(NULL, lp_private_dir())) {
1160                         DEBUG(0,("ERROR: Samba cannot open schannel store for secured NETLOGON operations.\n"));
1161                         exit(1);
1162                 }
1163         }
1164
1165         if(!get_global_sam_sid()) {
1166                 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1167                 exit(1);
1168         }
1169
1170         if (!sessionid_init()) {
1171                 exit(1);
1172         }
1173
1174         if (!connections_init(True))
1175                 exit(1);
1176
1177         if (!locking_init())
1178                 exit(1);
1179
1180         if (!messaging_tdb_parent_init(smbd_event_context())) {
1181                 exit(1);
1182         }
1183
1184         if (!notify_internal_parent_init(smbd_event_context())) {
1185                 exit(1);
1186         }
1187
1188         if (!serverid_parent_init(smbd_event_context())) {
1189                 exit(1);
1190         }
1191
1192         if (!printer_list_parent_init()) {
1193                 exit(1);
1194         }
1195
1196         if (!W_ERROR_IS_OK(registry_init_full()))
1197                 exit(1);
1198
1199         if (!print_backend_init(smbd_messaging_context()))
1200                 exit(1);
1201
1202         /* Open the share_info.tdb here, so we don't have to open
1203            after the fork on every single connection.  This is a small
1204            performance improvment and reduces the total number of system
1205            fds used. */
1206         if (!share_info_db_init()) {
1207                 DEBUG(0,("ERROR: failed to load share info db.\n"));
1208                 exit(1);
1209         }
1210
1211         status = init_system_info();
1212         if (!NT_STATUS_IS_OK(status)) {
1213                 DEBUG(1, ("ERROR: failed to setup system user info: %s.\n",
1214                           nt_errstr(status)));
1215                 return -1;
1216         }
1217
1218         if (!init_guest_info()) {
1219                 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1220                 return -1;
1221         }
1222
1223         if (!file_init(smbd_server_conn)) {
1224                 DEBUG(0, ("ERROR: file_init failed\n"));
1225                 return -1;
1226         }
1227
1228         if (is_daemon && !interactive) {
1229                 const char *rpcsrv_type;
1230
1231                 rpcsrv_type = lp_parm_const_string(GLOBAL_SECTION_SNUM,
1232                                                    "rpc_server", "epmapper",
1233                                                    "none");
1234                 if (StrCaseCmp(rpcsrv_type, "daemon") == 0) {
1235                         start_epmd(smbd_event_context(),
1236                                    smbd_server_conn->msg_ctx);
1237                 }
1238         }
1239
1240         if (!dcesrv_ep_setup(smbd_event_context(), smbd_server_conn->msg_ctx)) {
1241                 exit(1);
1242         }
1243
1244         /* Publish nt printers, this requires a working winreg pipe */
1245         pcap_cache_reload(server_event_context(), smbd_messaging_context(),
1246                           &reload_printers);
1247
1248         /* only start the background queue daemon if we are 
1249            running as a daemon -- bad things will happen if
1250            smbd is launched via inetd and we fork a copy of 
1251            ourselves here */
1252
1253         if (is_daemon && !interactive
1254             && lp_parm_bool(-1, "smbd", "backgroundqueue", true)) {
1255                 start_background_queue(smbd_event_context(),
1256                                        smbd_messaging_context());
1257         }
1258
1259         if (is_daemon && !_lp_disable_spoolss()) {
1260                 const char *rpcsrv_type;
1261
1262                 /* start spoolss daemon */
1263                 /* start as a separate daemon only if enabled */
1264                 rpcsrv_type = lp_parm_const_string(GLOBAL_SECTION_SNUM,
1265                                                    "rpc_server", "spoolss",
1266                                                    "embedded");
1267                 if (StrCaseCmp(rpcsrv_type, "daemon") == 0) {
1268                         start_spoolssd(smbd_event_context(),
1269                                        smbd_messaging_context());
1270                 }
1271         }
1272
1273         if (!is_daemon) {
1274                 /* inetd mode */
1275                 TALLOC_FREE(frame);
1276
1277                 /* Started from inetd. fd 0 is the socket. */
1278                 /* We will abort gracefully when the client or remote system
1279                    goes away */
1280                 smbd_set_server_fd(dup(0));
1281
1282                 /* close our standard file descriptors */
1283                 close_low_fds(False); /* Don't close stderr */
1284
1285 #ifdef HAVE_ATEXIT
1286                 atexit(killkids);
1287 #endif
1288
1289                 /* Stop zombies */
1290                 smbd_setup_sig_chld_handler();
1291
1292                 smbd_process(smbd_server_conn);
1293
1294                 exit_server_cleanly(NULL);
1295                 return(0);
1296         }
1297
1298         parent = talloc_zero(smbd_event_context(), struct smbd_parent_context);
1299         if (!parent) {
1300                 exit_server("talloc(struct smbd_parent_context) failed");
1301         }
1302         parent->interactive = interactive;
1303
1304         if (!open_sockets_smbd(parent, smbd_messaging_context(), ports))
1305                 exit_server("open_sockets_smbd() failed");
1306
1307         TALLOC_FREE(frame);
1308         /* make sure we always have a valid stackframe */
1309         frame = talloc_stackframe();
1310
1311         smbd_parent_loop(parent);
1312
1313         exit_server_cleanly(NULL);
1314         TALLOC_FREE(frame);
1315         return(0);
1316 }