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