s3: smbd: Change smb_set_file_unix_link() to call SMB_VFS_SYMLINKAT().
[amitay/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 "lib/util/server_id.h"
27 #include "popt_common.h"
28 #include "smbd/smbd.h"
29 #include "smbd/globals.h"
30 #include "registry/reg_init_full.h"
31 #include "libcli/auth/schannel.h"
32 #include "secrets.h"
33 #include "../lib/util/memcache.h"
34 #include "ctdbd_conn.h"
35 #include "util_cluster.h"
36 #include "printing/queue_process.h"
37 #include "rpc_server/rpc_service_setup.h"
38 #include "rpc_server/rpc_config.h"
39 #include "passdb.h"
40 #include "auth.h"
41 #include "messages.h"
42 #include "messages_ctdb.h"
43 #include "smbprofile.h"
44 #include "lib/id_cache.h"
45 #include "lib/param/param.h"
46 #include "lib/background.h"
47 #include "../lib/util/pidfile.h"
48 #include "lib/smbd_shim.h"
49 #include "scavenger.h"
50 #include "locking/leases_db.h"
51 #include "smbd/notifyd/notifyd.h"
52 #include "smbd/smbd_cleanupd.h"
53 #include "lib/util/sys_rw.h"
54 #include "cleanupdb.h"
55 #include "g_lock.h"
56 #include "rpc_server/epmd.h"
57 #include "rpc_server/lsasd.h"
58 #include "rpc_server/fssd.h"
59 #include "rpc_server/mdssd.h"
60
61 #ifdef CLUSTER_SUPPORT
62 #include "ctdb_protocol.h"
63 #endif
64
65 struct smbd_open_socket;
66 struct smbd_child_pid;
67
68 struct smbd_parent_context {
69         bool interactive;
70
71         struct tevent_context *ev_ctx;
72         struct messaging_context *msg_ctx;
73
74         /* the list of listening sockets */
75         struct smbd_open_socket *sockets;
76
77         /* the list of current child processes */
78         struct smbd_child_pid *children;
79         size_t num_children;
80
81         struct server_id cleanupd;
82         struct server_id notifyd;
83
84         struct tevent_timer *cleanup_te;
85 };
86
87 struct smbd_open_socket {
88         struct smbd_open_socket *prev, *next;
89         struct smbd_parent_context *parent;
90         int fd;
91         struct tevent_fd *fde;
92 };
93
94 struct smbd_child_pid {
95         struct smbd_child_pid *prev, *next;
96         pid_t pid;
97 };
98
99 /*******************************************************************
100  What to do when smb.conf is updated.
101  ********************************************************************/
102
103 static void smbd_parent_conf_updated(struct messaging_context *msg,
104                                      void *private_data,
105                                      uint32_t msg_type,
106                                      struct server_id server_id,
107                                      DATA_BLOB *data)
108 {
109         struct tevent_context *ev_ctx =
110                 talloc_get_type_abort(private_data, struct tevent_context);
111         bool ok;
112
113         DEBUG(10,("smbd_parent_conf_updated: Got message saying smb.conf was "
114                   "updated. Reloading.\n"));
115         change_to_root_user();
116         reload_services(NULL, NULL, false);
117         printing_subsystem_update(ev_ctx, msg, false);
118
119         ok = reinit_guest_session_info(NULL);
120         if (!ok) {
121                 DBG_ERR("Failed to reinit guest info\n");
122         }
123 }
124
125 /*******************************************************************
126  Delete a statcache entry.
127  ********************************************************************/
128
129 static void smb_stat_cache_delete(struct messaging_context *msg,
130                                   void *private_data,
131                                   uint32_t msg_tnype,
132                                   struct server_id server_id,
133                                   DATA_BLOB *data)
134 {
135         const char *name = (const char *)data->data;
136         DEBUG(10,("smb_stat_cache_delete: delete name %s\n", name));
137         stat_cache_delete(name);
138 }
139
140 /****************************************************************************
141   Send a SIGTERM to our process group.
142 *****************************************************************************/
143
144 static void  killkids(void)
145 {
146         if(am_parent) kill(0,SIGTERM);
147 }
148
149 static void msg_exit_server(struct messaging_context *msg,
150                             void *private_data,
151                             uint32_t msg_type,
152                             struct server_id server_id,
153                             DATA_BLOB *data)
154 {
155         DEBUG(3, ("got a SHUTDOWN message\n"));
156         exit_server_cleanly(NULL);
157 }
158
159 #ifdef DEVELOPER
160 static void msg_inject_fault(struct messaging_context *msg,
161                              void *private_data,
162                              uint32_t msg_type,
163                              struct server_id src,
164                              DATA_BLOB *data)
165 {
166         int sig;
167         struct server_id_buf tmp;
168
169         if (data->length != sizeof(sig)) {
170                 DEBUG(0, ("Process %s sent bogus signal injection request\n",
171                           server_id_str_buf(src, &tmp)));
172                 return;
173         }
174
175         sig = *(int *)data->data;
176         if (sig == -1) {
177                 exit_server("internal error injected");
178                 return;
179         }
180
181 #ifdef HAVE_STRSIGNAL
182         DEBUG(0, ("Process %s requested injection of signal %d (%s)\n",
183                   server_id_str_buf(src, &tmp), sig, strsignal(sig)));
184 #else
185         DEBUG(0, ("Process %s requested injection of signal %d\n",
186                   server_id_str_buf(src, &tmp), sig));
187 #endif
188
189         kill(getpid(), sig);
190 }
191 #endif /* DEVELOPER */
192
193 #if defined(DEVELOPER) || defined(ENABLE_SELFTEST)
194 /*
195  * Sleep for the specified number of seconds.
196  */
197 static void msg_sleep(struct messaging_context *msg,
198                       void *private_data,
199                       uint32_t msg_type,
200                       struct server_id src,
201                       DATA_BLOB *data)
202 {
203         unsigned int seconds;
204         struct server_id_buf tmp;
205
206         if (data->length != sizeof(seconds)) {
207                 DBG_ERR("Process %s sent bogus sleep request\n",
208                         server_id_str_buf(src, &tmp));
209                 return;
210         }
211
212         seconds = *(unsigned int *)data->data;
213         DBG_ERR("Process %s request a sleep of %u seconds\n",
214                 server_id_str_buf(src, &tmp),
215                 seconds);
216         sleep(seconds);
217         DBG_ERR("Restarting after %u second sleep requested by process %s\n",
218                 seconds,
219                 server_id_str_buf(src, &tmp));
220 }
221 #endif /* DEVELOPER */
222
223 static NTSTATUS messaging_send_to_children(struct messaging_context *msg_ctx,
224                                            uint32_t msg_type, DATA_BLOB* data)
225 {
226         NTSTATUS status;
227         struct smbd_parent_context *parent = am_parent;
228         struct smbd_child_pid *child;
229
230         if (parent == NULL) {
231                 return NT_STATUS_INTERNAL_ERROR;
232         }
233
234         for (child = parent->children; child != NULL; child = child->next) {
235                 status = messaging_send(parent->msg_ctx,
236                                         pid_to_procid(child->pid),
237                                         msg_type, data);
238                 if (!NT_STATUS_IS_OK(status)) {
239                         DBG_DEBUG("messaging_send(%d) failed: %s\n",
240                                   (int)child->pid, nt_errstr(status));
241                 }
242         }
243         return NT_STATUS_OK;
244 }
245
246 static void smb_parent_send_to_children(struct messaging_context *ctx,
247                                         void* data,
248                                         uint32_t msg_type,
249                                         struct server_id srv_id,
250                                         DATA_BLOB* msg_data)
251 {
252         messaging_send_to_children(ctx, msg_type, msg_data);
253 }
254
255 /*
256  * Parent smbd process sets its own debug level first and then
257  * sends a message to all the smbd children to adjust their debug
258  * level to that of the parent.
259  */
260
261 static void smbd_msg_debug(struct messaging_context *msg_ctx,
262                            void *private_data,
263                            uint32_t msg_type,
264                            struct server_id server_id,
265                            DATA_BLOB *data)
266 {
267         debug_message(msg_ctx, private_data, MSG_DEBUG, server_id, data);
268
269         messaging_send_to_children(msg_ctx, MSG_DEBUG, data);
270 }
271
272 static void smbd_parent_id_cache_kill(struct messaging_context *msg_ctx,
273                                       void *private_data,
274                                       uint32_t msg_type,
275                                       struct server_id server_id,
276                                       DATA_BLOB* data)
277 {
278         const char *msg = (data && data->data)
279                 ? (const char *)data->data : "<NULL>";
280         struct id_cache_ref id;
281
282         if (!id_cache_ref_parse(msg, &id)) {
283                 DEBUG(0, ("Invalid ?ID: %s\n", msg));
284                 return;
285         }
286
287         id_cache_delete_from_cache(&id);
288
289         messaging_send_to_children(msg_ctx, msg_type, data);
290 }
291
292 static void smbd_parent_id_cache_delete(struct messaging_context *ctx,
293                                         void* data,
294                                         uint32_t msg_type,
295                                         struct server_id srv_id,
296                                         DATA_BLOB* msg_data)
297 {
298         id_cache_delete_message(ctx, data, msg_type, srv_id, msg_data);
299
300         messaging_send_to_children(ctx, msg_type, msg_data);
301 }
302
303 static void add_child_pid(struct smbd_parent_context *parent,
304                           pid_t pid)
305 {
306         struct smbd_child_pid *child;
307
308         child = talloc_zero(parent, struct smbd_child_pid);
309         if (child == NULL) {
310                 DEBUG(0, ("Could not add child struct -- malloc failed\n"));
311                 return;
312         }
313         child->pid = pid;
314         DLIST_ADD(parent->children, child);
315         parent->num_children += 1;
316 }
317
318 static void smb_tell_num_children(struct messaging_context *ctx, void *data,
319                                   uint32_t msg_type, struct server_id srv_id,
320                                   DATA_BLOB *msg_data)
321 {
322         uint8_t buf[sizeof(uint32_t)];
323
324         if (am_parent) {
325                 SIVAL(buf, 0, am_parent->num_children);
326                 messaging_send_buf(ctx, srv_id, MSG_SMB_NUM_CHILDREN,
327                                    buf, sizeof(buf));
328         }
329 }
330
331 static void notifyd_stopped(struct tevent_req *req);
332
333 static struct tevent_req *notifyd_req(struct messaging_context *msg_ctx,
334                                       struct tevent_context *ev)
335 {
336         struct tevent_req *req;
337         sys_notify_watch_fn sys_notify_watch = NULL;
338         struct sys_notify_context *sys_notify_ctx = NULL;
339         struct ctdbd_connection *ctdbd_conn = NULL;
340
341         if (lp_kernel_change_notify()) {
342
343 #ifdef HAVE_INOTIFY
344                 if (lp_parm_bool(-1, "notify", "inotify", true)) {
345                         sys_notify_watch = inotify_watch;
346                 }
347 #endif
348
349 #ifdef HAVE_FAM
350                 if (lp_parm_bool(-1, "notify", "fam",
351                                  (sys_notify_watch == NULL))) {
352                         sys_notify_watch = fam_watch;
353                 }
354 #endif
355         }
356
357         if (sys_notify_watch != NULL) {
358                 sys_notify_ctx = sys_notify_context_create(msg_ctx, ev);
359                 if (sys_notify_ctx == NULL) {
360                         return NULL;
361                 }
362         }
363
364         if (lp_clustering()) {
365                 ctdbd_conn = messaging_ctdb_connection();
366         }
367
368         req = notifyd_send(msg_ctx, ev, msg_ctx, ctdbd_conn,
369                            sys_notify_watch, sys_notify_ctx);
370         if (req == NULL) {
371                 TALLOC_FREE(sys_notify_ctx);
372                 return NULL;
373         }
374         tevent_req_set_callback(req, notifyd_stopped, msg_ctx);
375
376         return req;
377 }
378
379 static void notifyd_stopped(struct tevent_req *req)
380 {
381         int ret;
382
383         ret = notifyd_recv(req);
384         TALLOC_FREE(req);
385         DEBUG(1, ("notifyd stopped: %s\n", strerror(ret)));
386 }
387
388 static void notifyd_sig_hup_handler(struct tevent_context *ev,
389                                     struct tevent_signal *se,
390                                     int signum,
391                                     int count,
392                                     void *siginfo,
393                                     void *pvt)
394 {
395         DBG_NOTICE("notifyd: Reloading services after SIGHUP\n");
396         reload_services(NULL, NULL, false);
397 }
398
399 static bool smbd_notifyd_init(struct messaging_context *msg, bool interactive,
400                               struct server_id *ppid)
401 {
402         struct tevent_context *ev = messaging_tevent_context(msg);
403         struct tevent_req *req;
404         pid_t pid;
405         NTSTATUS status;
406         bool ok;
407         struct tevent_signal *se;
408
409         if (interactive) {
410                 req = notifyd_req(msg, ev);
411                 return (req != NULL);
412         }
413
414         pid = fork();
415         if (pid == -1) {
416                 DEBUG(1, ("%s: fork failed: %s\n", __func__,
417                           strerror(errno)));
418                 return false;
419         }
420
421         if (pid != 0) {
422                 if (am_parent != 0) {
423                         add_child_pid(am_parent, pid);
424                 }
425                 *ppid = pid_to_procid(pid);
426                 return true;
427         }
428
429         status = smbd_reinit_after_fork(msg, ev, true, "smbd-notifyd");
430         if (!NT_STATUS_IS_OK(status)) {
431                 DEBUG(1, ("%s: reinit_after_fork failed: %s\n",
432                           __func__, nt_errstr(status)));
433                 exit(1);
434         }
435
436         /* Set up sighup handler for notifyd */
437         se = tevent_add_signal(ev,
438                                ev,
439                                SIGHUP, 0,
440                                notifyd_sig_hup_handler,
441                                NULL);
442         if (!se) {
443                 DEBUG(0, ("failed to setup notifyd SIGHUP handler\n"));
444                 exit(1);
445         }
446
447         req = notifyd_req(msg, ev);
448         if (req == NULL) {
449                 exit(1);
450         }
451         tevent_req_set_callback(req, notifyd_stopped, msg);
452
453         /* Block those signals that we are not handling */
454         BlockSignals(True, SIGUSR1);
455
456         messaging_send(msg, pid_to_procid(getppid()), MSG_SMB_NOTIFY_STARTED,
457                        NULL);
458
459         ok = tevent_req_poll(req, ev);
460         if (!ok) {
461                 DBG_WARNING("tevent_req_poll returned %s\n", strerror(errno));
462                 exit(1);
463         }
464         exit(0);
465 }
466
467 static void notifyd_init_trigger(struct tevent_req *req);
468
469 struct notifyd_init_state {
470         bool ok;
471         struct tevent_context *ev;
472         struct messaging_context *msg;
473         struct server_id *ppid;
474 };
475
476 static struct tevent_req *notifyd_init_send(struct tevent_context *ev,
477                                             TALLOC_CTX *mem_ctx,
478                                             struct messaging_context *msg,
479                                             struct server_id *ppid)
480 {
481         struct tevent_req *req = NULL;
482         struct tevent_req *subreq = NULL;
483         struct notifyd_init_state *state = NULL;
484
485         req = tevent_req_create(mem_ctx, &state, struct notifyd_init_state);
486         if (req == NULL) {
487                 return NULL;
488         }
489
490         *state = (struct notifyd_init_state) {
491                 .msg = msg,
492                 .ev = ev,
493                 .ppid = ppid
494         };
495
496         subreq = tevent_wakeup_send(state, ev, tevent_timeval_current_ofs(1, 0));
497         if (tevent_req_nomem(subreq, req)) {
498                 return tevent_req_post(req, ev);
499         }
500
501         tevent_req_set_callback(subreq, notifyd_init_trigger, req);
502         return req;
503 }
504
505 static void notifyd_init_trigger(struct tevent_req *subreq)
506 {
507         struct tevent_req *req = tevent_req_callback_data(
508                 subreq, struct tevent_req);
509         struct notifyd_init_state *state = tevent_req_data(
510                 req, struct notifyd_init_state);
511         bool ok;
512
513         DBG_NOTICE("Triggering notifyd startup\n");
514
515         ok = tevent_wakeup_recv(subreq);
516         TALLOC_FREE(subreq);
517         if (!ok) {
518                 tevent_req_error(req, ENOMEM);
519                 return;
520         }
521
522         state->ok = smbd_notifyd_init(state->msg, false, state->ppid);
523         if (state->ok) {
524                 DBG_WARNING("notifyd restarted\n");
525                 tevent_req_done(req);
526                 return;
527         }
528
529         DBG_NOTICE("notifyd startup failed, rescheduling\n");
530
531         subreq = tevent_wakeup_send(state, state->ev,
532                                     tevent_timeval_current_ofs(1, 0));
533         if (tevent_req_nomem(subreq, req)) {
534                 DBG_ERR("scheduling notifyd restart failed, giving up\n");
535                 return;
536         }
537
538         tevent_req_set_callback(subreq, notifyd_init_trigger, req);
539         return;
540 }
541
542 static bool notifyd_init_recv(struct tevent_req *req)
543 {
544         struct notifyd_init_state *state = tevent_req_data(
545                 req, struct notifyd_init_state);
546
547         return state->ok;
548 }
549
550 static void notifyd_started(struct tevent_req *req)
551 {
552         bool ok;
553
554         ok = notifyd_init_recv(req);
555         TALLOC_FREE(req);
556         if (!ok) {
557                 DBG_ERR("Failed to restart notifyd, giving up\n");
558                 return;
559         }
560 }
561
562 static void cleanupd_stopped(struct tevent_req *req);
563
564 static bool cleanupd_init(struct messaging_context *msg, bool interactive,
565                           struct server_id *ppid)
566 {
567         struct tevent_context *ev = messaging_tevent_context(msg);
568         struct server_id parent_id = messaging_server_id(msg);
569         struct tevent_req *req;
570         pid_t pid;
571         NTSTATUS status;
572         ssize_t rwret;
573         int ret;
574         bool ok;
575         char c;
576         int up_pipe[2];
577
578         if (interactive) {
579                 req = smbd_cleanupd_send(msg, ev, msg, parent_id.pid);
580                 *ppid = messaging_server_id(msg);
581                 return (req != NULL);
582         }
583
584         ret = pipe(up_pipe);
585         if (ret == -1) {
586                 DBG_WARNING("pipe failed: %s\n", strerror(errno));
587                 return false;
588         }
589
590         pid = fork();
591         if (pid == -1) {
592                 DBG_WARNING("fork failed: %s\n", strerror(errno));
593                 close(up_pipe[0]);
594                 close(up_pipe[1]);
595                 return false;
596         }
597
598         if (pid != 0) {
599
600                 close(up_pipe[1]);
601                 rwret = sys_read(up_pipe[0], &c, 1);
602                 close(up_pipe[0]);
603
604                 if (rwret == -1) {
605                         DBG_WARNING("sys_read failed: %s\n", strerror(errno));
606                         return false;
607                 }
608                 if (rwret == 0) {
609                         DBG_WARNING("cleanupd could not start\n");
610                         return false;
611                 }
612                 if (c != 0) {
613                         DBG_WARNING("cleanupd returned %d\n", (int)c);
614                         return false;
615                 }
616
617                 DBG_DEBUG("Started cleanupd pid=%d\n", (int)pid);
618
619                 if (am_parent != NULL) {
620                         add_child_pid(am_parent, pid);
621                 }
622
623                 *ppid = pid_to_procid(pid);
624                 return true;
625         }
626
627         close(up_pipe[0]);
628
629         status = smbd_reinit_after_fork(msg, ev, true, "cleanupd");
630         if (!NT_STATUS_IS_OK(status)) {
631                 DBG_WARNING("reinit_after_fork failed: %s\n",
632                             nt_errstr(status));
633                 c = 1;
634                 sys_write(up_pipe[1], &c, 1);
635
636                 exit(1);
637         }
638
639         req = smbd_cleanupd_send(msg, ev, msg, parent_id.pid);
640         if (req == NULL) {
641                 DBG_WARNING("smbd_cleanupd_send failed\n");
642                 c = 2;
643                 sys_write(up_pipe[1], &c, 1);
644
645                 exit(1);
646         }
647
648         tevent_req_set_callback(req, cleanupd_stopped, msg);
649
650         c = 0;
651         rwret = sys_write(up_pipe[1], &c, 1);
652         close(up_pipe[1]);
653
654         if (rwret == -1) {
655                 DBG_WARNING("sys_write failed: %s\n", strerror(errno));
656                 exit(1);
657         }
658         if (rwret != 1) {
659                 DBG_WARNING("sys_write could not write result\n");
660                 exit(1);
661         }
662
663         ok = tevent_req_poll(req, ev);
664         if (!ok) {
665                 DBG_WARNING("tevent_req_poll returned %s\n", strerror(errno));
666         }
667         exit(0);
668 }
669
670 static void cleanupd_stopped(struct tevent_req *req)
671 {
672         NTSTATUS status;
673
674         status = smbd_cleanupd_recv(req);
675         DBG_WARNING("cleanupd stopped: %s\n", nt_errstr(status));
676 }
677
678 static void cleanupd_init_trigger(struct tevent_req *req);
679
680 struct cleanup_init_state {
681         bool ok;
682         struct tevent_context *ev;
683         struct messaging_context *msg;
684         struct server_id *ppid;
685 };
686
687 static struct tevent_req *cleanupd_init_send(struct tevent_context *ev,
688                                              TALLOC_CTX *mem_ctx,
689                                              struct messaging_context *msg,
690                                              struct server_id *ppid)
691 {
692         struct tevent_req *req = NULL;
693         struct tevent_req *subreq = NULL;
694         struct cleanup_init_state *state = NULL;
695
696         req = tevent_req_create(mem_ctx, &state, struct cleanup_init_state);
697         if (req == NULL) {
698                 return NULL;
699         }
700
701         *state = (struct cleanup_init_state) {
702                 .msg = msg,
703                 .ev = ev,
704                 .ppid = ppid
705         };
706
707         subreq = tevent_wakeup_send(state, ev, tevent_timeval_current_ofs(0, 0));
708         if (tevent_req_nomem(subreq, req)) {
709                 return tevent_req_post(req, ev);
710         }
711
712         tevent_req_set_callback(subreq, cleanupd_init_trigger, req);
713         return req;
714 }
715
716 static void cleanupd_init_trigger(struct tevent_req *subreq)
717 {
718         struct tevent_req *req = tevent_req_callback_data(
719                 subreq, struct tevent_req);
720         struct cleanup_init_state *state = tevent_req_data(
721                 req, struct cleanup_init_state);
722         bool ok;
723
724         DBG_NOTICE("Triggering cleanupd startup\n");
725
726         ok = tevent_wakeup_recv(subreq);
727         TALLOC_FREE(subreq);
728         if (!ok) {
729                 tevent_req_error(req, ENOMEM);
730                 return;
731         }
732
733         state->ok = cleanupd_init(state->msg, false, state->ppid);
734         if (state->ok) {
735                 DBG_WARNING("cleanupd restarted\n");
736                 tevent_req_done(req);
737                 return;
738         }
739
740         DBG_NOTICE("cleanupd startup failed, rescheduling\n");
741
742         subreq = tevent_wakeup_send(state, state->ev,
743                                     tevent_timeval_current_ofs(1, 0));
744         if (tevent_req_nomem(subreq, req)) {
745                 DBG_ERR("scheduling cleanupd restart failed, giving up\n");
746                 return;
747         }
748
749         tevent_req_set_callback(subreq, cleanupd_init_trigger, req);
750         return;
751 }
752
753 static bool cleanupd_init_recv(struct tevent_req *req)
754 {
755         struct cleanup_init_state *state = tevent_req_data(
756                 req, struct cleanup_init_state);
757
758         return state->ok;
759 }
760
761 static void cleanupd_started(struct tevent_req *req)
762 {
763         bool ok;
764         NTSTATUS status;
765         struct smbd_parent_context *parent = tevent_req_callback_data(
766                 req, struct smbd_parent_context);
767
768         ok = cleanupd_init_recv(req);
769         TALLOC_FREE(req);
770         if (!ok) {
771                 DBG_ERR("Failed to restart cleanupd, giving up\n");
772                 return;
773         }
774
775         status = messaging_send(parent->msg_ctx,
776                                 parent->cleanupd,
777                                 MSG_SMB_NOTIFY_CLEANUP,
778                                 &data_blob_null);
779         if (!NT_STATUS_IS_OK(status)) {
780                 DBG_ERR("messaging_send returned %s\n",
781                         nt_errstr(status));
782         }
783 }
784
785 static void remove_child_pid(struct smbd_parent_context *parent,
786                              pid_t pid,
787                              bool unclean_shutdown)
788 {
789         struct smbd_child_pid *child;
790         NTSTATUS status;
791         bool ok;
792
793         for (child = parent->children; child != NULL; child = child->next) {
794                 if (child->pid == pid) {
795                         struct smbd_child_pid *tmp = child;
796                         DLIST_REMOVE(parent->children, child);
797                         TALLOC_FREE(tmp);
798                         parent->num_children -= 1;
799                         break;
800                 }
801         }
802
803         if (child == NULL) {
804                 /* not all forked child processes are added to the children list */
805                 DEBUG(2, ("Could not find child %d -- ignoring\n", (int)pid));
806                 return;
807         }
808
809         if (pid == procid_to_pid(&parent->cleanupd)) {
810                 struct tevent_req *req;
811
812                 server_id_set_disconnected(&parent->cleanupd);
813
814                 DBG_WARNING("Restarting cleanupd\n");
815                 req = cleanupd_init_send(messaging_tevent_context(parent->msg_ctx),
816                                          parent,
817                                          parent->msg_ctx,
818                                          &parent->cleanupd);
819                 if (req == NULL) {
820                         DBG_ERR("Failed to restart cleanupd\n");
821                         return;
822                 }
823                 tevent_req_set_callback(req, cleanupd_started, parent);
824                 return;
825         }
826
827         if (pid == procid_to_pid(&parent->notifyd)) {
828                 struct tevent_req *req;
829                 struct tevent_context *ev = messaging_tevent_context(
830                         parent->msg_ctx);
831
832                 server_id_set_disconnected(&parent->notifyd);
833
834                 DBG_WARNING("Restarting notifyd\n");
835                 req = notifyd_init_send(ev,
836                                         parent,
837                                         parent->msg_ctx,
838                                         &parent->notifyd);
839                 if (req == NULL) {
840                         DBG_ERR("Failed to restart notifyd\n");
841                         return;
842                 }
843                 tevent_req_set_callback(req, notifyd_started, parent);
844                 return;
845         }
846
847         ok = cleanupdb_store_child(pid, unclean_shutdown);
848         if (!ok) {
849                 DBG_ERR("cleanupdb_store_child failed\n");
850                 return;
851         }
852
853         if (!server_id_is_disconnected(&parent->cleanupd)) {
854                 status = messaging_send(parent->msg_ctx,
855                                         parent->cleanupd,
856                                         MSG_SMB_NOTIFY_CLEANUP,
857                                         &data_blob_null);
858                 if (!NT_STATUS_IS_OK(status)) {
859                         DBG_ERR("messaging_send returned %s\n",
860                                 nt_errstr(status));
861                 }
862         }
863 }
864
865 /****************************************************************************
866  Have we reached the process limit ?
867 ****************************************************************************/
868
869 static bool allowable_number_of_smbd_processes(struct smbd_parent_context *parent)
870 {
871         int max_processes = lp_max_smbd_processes();
872
873         if (!max_processes)
874                 return True;
875
876         return parent->num_children < max_processes;
877 }
878
879 static void smbd_sig_chld_handler(struct tevent_context *ev,
880                                   struct tevent_signal *se,
881                                   int signum,
882                                   int count,
883                                   void *siginfo,
884                                   void *private_data)
885 {
886         pid_t pid;
887         int status;
888         struct smbd_parent_context *parent =
889                 talloc_get_type_abort(private_data,
890                 struct smbd_parent_context);
891
892         while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
893                 bool unclean_shutdown = False;
894
895                 /* If the child terminated normally, assume
896                    it was an unclean shutdown unless the
897                    status is 0
898                 */
899                 if (WIFEXITED(status)) {
900                         unclean_shutdown = WEXITSTATUS(status);
901                 }
902                 /* If the child terminated due to a signal
903                    we always assume it was unclean.
904                 */
905                 if (WIFSIGNALED(status)) {
906                         unclean_shutdown = True;
907                 }
908                 remove_child_pid(parent, pid, unclean_shutdown);
909         }
910 }
911
912 static void smbd_setup_sig_chld_handler(struct smbd_parent_context *parent)
913 {
914         struct tevent_signal *se;
915
916         se = tevent_add_signal(parent->ev_ctx,
917                                parent, /* mem_ctx */
918                                SIGCHLD, 0,
919                                smbd_sig_chld_handler,
920                                parent);
921         if (!se) {
922                 exit_server("failed to setup SIGCHLD handler");
923         }
924 }
925
926 static void smbd_open_socket_close_fn(struct tevent_context *ev,
927                                       struct tevent_fd *fde,
928                                       int fd,
929                                       void *private_data)
930 {
931         /* this might be the socket_wrapper swrap_close() */
932         close(fd);
933 }
934
935 static void smbd_accept_connection(struct tevent_context *ev,
936                                    struct tevent_fd *fde,
937                                    uint16_t flags,
938                                    void *private_data)
939 {
940         struct smbd_open_socket *s = talloc_get_type_abort(private_data,
941                                      struct smbd_open_socket);
942         struct messaging_context *msg_ctx = s->parent->msg_ctx;
943         struct sockaddr_storage addr;
944         socklen_t in_addrlen = sizeof(addr);
945         int fd;
946         pid_t pid = 0;
947
948         fd = accept(s->fd, (struct sockaddr *)(void *)&addr,&in_addrlen);
949         if (fd == -1 && errno == EINTR)
950                 return;
951
952         if (fd == -1) {
953                 DEBUG(0,("accept: %s\n",
954                          strerror(errno)));
955                 return;
956         }
957         smb_set_close_on_exec(fd);
958
959         if (s->parent->interactive) {
960                 reinit_after_fork(msg_ctx, ev, true, NULL);
961                 smbd_process(ev, msg_ctx, fd, true);
962                 exit_server_cleanly("end of interactive mode");
963                 return;
964         }
965
966         if (!allowable_number_of_smbd_processes(s->parent)) {
967                 close(fd);
968                 return;
969         }
970
971         pid = fork();
972         if (pid == 0) {
973                 NTSTATUS status = NT_STATUS_OK;
974
975                 /*
976                  * Can't use TALLOC_FREE here. Nulling out the argument to it
977                  * would overwrite memory we've just freed.
978                  */
979                 talloc_free(s->parent);
980                 s = NULL;
981
982                 /* Stop zombies, the parent explicitly handles
983                  * them, counting worker smbds. */
984                 CatchChild();
985
986                 status = smbd_reinit_after_fork(msg_ctx, ev, true, NULL);
987                 if (!NT_STATUS_IS_OK(status)) {
988                         if (NT_STATUS_EQUAL(status,
989                                             NT_STATUS_TOO_MANY_OPENED_FILES)) {
990                                 DEBUG(0,("child process cannot initialize "
991                                          "because too many files are open\n"));
992                                 goto exit;
993                         }
994                         if (lp_clustering() &&
995                             (NT_STATUS_EQUAL(
996                                     status, NT_STATUS_INTERNAL_DB_ERROR) ||
997                              NT_STATUS_EQUAL(
998                                     status, NT_STATUS_CONNECTION_REFUSED))) {
999                                 DEBUG(1, ("child process cannot initialize "
1000                                           "because connection to CTDB "
1001                                           "has failed: %s\n",
1002                                           nt_errstr(status)));
1003                                 goto exit;
1004                         }
1005
1006                         DEBUG(0,("reinit_after_fork() failed\n"));
1007                         smb_panic("reinit_after_fork() failed");
1008                 }
1009
1010                 smbd_process(ev, msg_ctx, fd, false);
1011          exit:
1012                 exit_server_cleanly("end of child");
1013                 return;
1014         }
1015
1016         if (pid < 0) {
1017                 DEBUG(0,("smbd_accept_connection: fork() failed: %s\n",
1018                          strerror(errno)));
1019         }
1020
1021         /* The parent doesn't need this socket */
1022         close(fd);
1023
1024         /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
1025                 Clear the closed fd info out of server_fd --
1026                 and more importantly, out of client_fd in
1027                 util_sock.c, to avoid a possible
1028                 getpeername failure if we reopen the logs
1029                 and use %I in the filename.
1030         */
1031
1032         if (pid != 0) {
1033                 add_child_pid(s->parent, pid);
1034         }
1035
1036         /* Force parent to check log size after
1037          * spawning child.  Fix from
1038          * klausr@ITAP.Physik.Uni-Stuttgart.De.  The
1039          * parent smbd will log to logserver.smb.  It
1040          * writes only two messages for each child
1041          * started/finished. But each child writes,
1042          * say, 50 messages also in logserver.smb,
1043          * begining with the debug_count of the
1044          * parent, before the child opens its own log
1045          * file logserver.client. In a worst case
1046          * scenario the size of logserver.smb would be
1047          * checked after about 50*50=2500 messages
1048          * (ca. 100kb).
1049          * */
1050         force_check_log_size();
1051 }
1052
1053 static bool smbd_open_one_socket(struct smbd_parent_context *parent,
1054                                  struct tevent_context *ev_ctx,
1055                                  const struct sockaddr_storage *ifss,
1056                                  uint16_t port)
1057 {
1058         struct smbd_open_socket *s;
1059
1060         s = talloc(parent, struct smbd_open_socket);
1061         if (!s) {
1062                 return false;
1063         }
1064
1065         s->parent = parent;
1066         s->fd = open_socket_in(SOCK_STREAM,
1067                                port,
1068                                parent->sockets == NULL ? 0 : 2,
1069                                ifss,
1070                                true);
1071         if (s->fd == -1) {
1072                 DEBUG(0,("smbd_open_one_socket: open_socket_in: "
1073                         "%s\n", strerror(errno)));
1074                 TALLOC_FREE(s);
1075                 /*
1076                  * We ignore an error here, as we've done before
1077                  */
1078                 return true;
1079         }
1080
1081         /* ready to listen */
1082         set_socket_options(s->fd, "SO_KEEPALIVE");
1083         set_socket_options(s->fd, lp_socket_options());
1084
1085         /* Set server socket to
1086          * non-blocking for the accept. */
1087         set_blocking(s->fd, False);
1088
1089         if (listen(s->fd, SMBD_LISTEN_BACKLOG) == -1) {
1090                 DEBUG(0,("smbd_open_one_socket: listen: "
1091                         "%s\n", strerror(errno)));
1092                         close(s->fd);
1093                 TALLOC_FREE(s);
1094                 return false;
1095         }
1096
1097         s->fde = tevent_add_fd(ev_ctx,
1098                                s,
1099                                s->fd, TEVENT_FD_READ,
1100                                smbd_accept_connection,
1101                                s);
1102         if (!s->fde) {
1103                 DEBUG(0,("smbd_open_one_socket: "
1104                          "tevent_add_fd: %s\n",
1105                          strerror(errno)));
1106                 close(s->fd);
1107                 TALLOC_FREE(s);
1108                 return false;
1109         }
1110         tevent_fd_set_close_fn(s->fde, smbd_open_socket_close_fn);
1111
1112         DLIST_ADD_END(parent->sockets, s);
1113
1114         return true;
1115 }
1116
1117 /****************************************************************************
1118  Open the socket communication.
1119 ****************************************************************************/
1120
1121 static bool open_sockets_smbd(struct smbd_parent_context *parent,
1122                               struct tevent_context *ev_ctx,
1123                               struct messaging_context *msg_ctx,
1124                               const char *smb_ports)
1125 {
1126         int num_interfaces = iface_count();
1127         int i,j;
1128         const char **ports;
1129         unsigned dns_port = 0;
1130
1131 #ifdef HAVE_ATEXIT
1132         atexit(killkids);
1133 #endif
1134
1135         /* Stop zombies */
1136         smbd_setup_sig_chld_handler(parent);
1137
1138         ports = lp_smb_ports();
1139
1140         /* use a reasonable default set of ports - listing on 445 and 139 */
1141         if (smb_ports) {
1142                 char **l;
1143                 l = str_list_make_v3(talloc_tos(), smb_ports, NULL);
1144                 ports = discard_const_p(const char *, l);
1145         }
1146
1147         for (j = 0; ports && ports[j]; j++) {
1148                 unsigned port = atoi(ports[j]);
1149
1150                 if (port == 0 || port > 0xffff) {
1151                         exit_server_cleanly("Invalid port in the config or on "
1152                                             "the commandline specified!");
1153                 }
1154         }
1155
1156         if (lp_interfaces() && lp_bind_interfaces_only()) {
1157                 /* We have been given an interfaces line, and been
1158                    told to only bind to those interfaces. Create a
1159                    socket per interface and bind to only these.
1160                 */
1161
1162                 /* Now open a listen socket for each of the
1163                    interfaces. */
1164                 for(i = 0; i < num_interfaces; i++) {
1165                         const struct sockaddr_storage *ifss =
1166                                         iface_n_sockaddr_storage(i);
1167                         if (ifss == NULL) {
1168                                 DEBUG(0,("open_sockets_smbd: "
1169                                         "interface %d has NULL IP address !\n",
1170                                         i));
1171                                 continue;
1172                         }
1173
1174                         for (j = 0; ports && ports[j]; j++) {
1175                                 unsigned port = atoi(ports[j]);
1176
1177                                 /* Keep the first port for mDNS service
1178                                  * registration.
1179                                  */
1180                                 if (dns_port == 0) {
1181                                         dns_port = port;
1182                                 }
1183
1184                                 if (!smbd_open_one_socket(parent,
1185                                                           ev_ctx,
1186                                                           ifss,
1187                                                           port)) {
1188                                         return false;
1189                                 }
1190                         }
1191                 }
1192         } else {
1193                 /* Just bind to 0.0.0.0 - accept connections
1194                    from anywhere. */
1195
1196                 const char *sock_addr;
1197                 char *sock_tok;
1198                 const char *sock_ptr;
1199
1200 #ifdef HAVE_IPV6
1201                 sock_addr = "::,0.0.0.0";
1202 #else
1203                 sock_addr = "0.0.0.0";
1204 #endif
1205
1206                 for (sock_ptr=sock_addr;
1207                      next_token_talloc(talloc_tos(), &sock_ptr, &sock_tok, " \t,"); ) {
1208                         for (j = 0; ports && ports[j]; j++) {
1209                                 struct sockaddr_storage ss;
1210                                 unsigned port = atoi(ports[j]);
1211
1212                                 /* Keep the first port for mDNS service
1213                                  * registration.
1214                                  */
1215                                 if (dns_port == 0) {
1216                                         dns_port = port;
1217                                 }
1218
1219                                 /* open an incoming socket */
1220                                 if (!interpret_string_addr(&ss, sock_tok,
1221                                                 AI_NUMERICHOST|AI_PASSIVE)) {
1222                                         continue;
1223                                 }
1224
1225                                 /*
1226                                  * If we fail to open any sockets
1227                                  * in this loop the parent-sockets == NULL
1228                                  * case below will prevent us from starting.
1229                                  */
1230
1231                                 (void)smbd_open_one_socket(parent,
1232                                                   ev_ctx,
1233                                                   &ss,
1234                                                   port);
1235                         }
1236                 }
1237         }
1238
1239         if (parent->sockets == NULL) {
1240                 DEBUG(0,("open_sockets_smbd: No "
1241                         "sockets available to bind to.\n"));
1242                 return false;
1243         }
1244
1245         /* Listen to messages */
1246
1247         messaging_register(msg_ctx, NULL, MSG_SHUTDOWN, msg_exit_server);
1248         messaging_register(msg_ctx, ev_ctx, MSG_SMB_CONF_UPDATED,
1249                            smbd_parent_conf_updated);
1250         messaging_register(msg_ctx, NULL, MSG_SMB_STAT_CACHE_DELETE,
1251                            smb_stat_cache_delete);
1252         messaging_register(msg_ctx, NULL, MSG_DEBUG, smbd_msg_debug);
1253         messaging_register(msg_ctx, NULL, MSG_SMB_FORCE_TDIS,
1254                            smb_parent_send_to_children);
1255         messaging_register(msg_ctx, NULL, MSG_SMB_KILL_CLIENT_IP,
1256                            smb_parent_send_to_children);
1257         messaging_register(msg_ctx, NULL, MSG_SMB_TELL_NUM_CHILDREN,
1258                            smb_tell_num_children);
1259
1260         messaging_register(msg_ctx, NULL,
1261                            ID_CACHE_DELETE, smbd_parent_id_cache_delete);
1262         messaging_register(msg_ctx, NULL,
1263                            ID_CACHE_KILL, smbd_parent_id_cache_kill);
1264         messaging_register(msg_ctx, NULL, MSG_SMB_NOTIFY_STARTED,
1265                            smb_parent_send_to_children);
1266
1267 #ifdef DEVELOPER
1268         messaging_register(msg_ctx, NULL, MSG_SMB_INJECT_FAULT,
1269                            msg_inject_fault);
1270 #endif
1271
1272 #if defined(DEVELOPER) || defined(ENABLE_SELFTEST)
1273         messaging_register(msg_ctx, NULL, MSG_SMB_SLEEP, msg_sleep);
1274 #endif
1275
1276         if (lp_multicast_dns_register() && (dns_port != 0)) {
1277 #ifdef WITH_DNSSD_SUPPORT
1278                 smbd_setup_mdns_registration(ev_ctx,
1279                                              parent, dns_port);
1280 #endif
1281 #ifdef WITH_AVAHI_SUPPORT
1282                 void *avahi_conn;
1283
1284                 avahi_conn = avahi_start_register(ev_ctx,
1285                                                   ev_ctx,
1286                                                   dns_port);
1287                 if (avahi_conn == NULL) {
1288                         DEBUG(10, ("avahi_start_register failed\n"));
1289                 }
1290 #endif
1291         }
1292
1293         return true;
1294 }
1295
1296
1297 /*
1298   handle stdin becoming readable when we are in --foreground mode
1299  */
1300 static void smbd_stdin_handler(struct tevent_context *ev,
1301                                struct tevent_fd *fde,
1302                                uint16_t flags,
1303                                void *private_data)
1304 {
1305         char c;
1306         if (read(0, &c, 1) != 1) {
1307                 /* we have reached EOF on stdin, which means the
1308                    parent has exited. Shutdown the server */
1309                 exit_server_cleanly("EOF on stdin");
1310         }
1311 }
1312
1313 struct smbd_parent_tevent_trace_state {
1314         TALLOC_CTX *frame;
1315 };
1316
1317 static void smbd_parent_tevent_trace_callback(enum tevent_trace_point point,
1318                                               void *private_data)
1319 {
1320         struct smbd_parent_tevent_trace_state *state =
1321                 (struct smbd_parent_tevent_trace_state *)private_data;
1322
1323         switch (point) {
1324         case TEVENT_TRACE_BEFORE_WAIT:
1325                 break;
1326         case TEVENT_TRACE_AFTER_WAIT:
1327                 break;
1328         case TEVENT_TRACE_BEFORE_LOOP_ONCE:
1329                 TALLOC_FREE(state->frame);
1330                 state->frame = talloc_stackframe();
1331                 break;
1332         case TEVENT_TRACE_AFTER_LOOP_ONCE:
1333                 TALLOC_FREE(state->frame);
1334                 break;
1335         }
1336
1337         errno = 0;
1338 }
1339
1340 static void smbd_parent_loop(struct tevent_context *ev_ctx,
1341                              struct smbd_parent_context *parent)
1342 {
1343         struct smbd_parent_tevent_trace_state trace_state = {
1344                 .frame = NULL,
1345         };
1346         int ret = 0;
1347
1348         tevent_set_trace_callback(ev_ctx, smbd_parent_tevent_trace_callback,
1349                                   &trace_state);
1350
1351         /* now accept incoming connections - forking a new process
1352            for each incoming connection */
1353         DEBUG(2,("waiting for connections\n"));
1354
1355         ret = tevent_loop_wait(ev_ctx);
1356         if (ret != 0) {
1357                 DEBUG(0, ("tevent_loop_wait failed: %d, %s, exiting\n",
1358                           ret, strerror(errno)));
1359         }
1360
1361         TALLOC_FREE(trace_state.frame);
1362
1363 /* NOTREACHED   return True; */
1364 }
1365
1366
1367 /****************************************************************************
1368  Initialise connect, service and file structs.
1369 ****************************************************************************/
1370
1371 static bool init_structs(void )
1372 {
1373         /*
1374          * Set the machine NETBIOS name if not already
1375          * set from the config file.
1376          */
1377
1378         if (!init_names())
1379                 return False;
1380
1381         if (!secrets_init())
1382                 return False;
1383
1384         return True;
1385 }
1386
1387 static void smbd_parent_sig_term_handler(struct tevent_context *ev,
1388                                          struct tevent_signal *se,
1389                                          int signum,
1390                                          int count,
1391                                          void *siginfo,
1392                                          void *private_data)
1393 {
1394         exit_server_cleanly("termination signal");
1395 }
1396
1397 static void smbd_parent_sig_hup_handler(struct tevent_context *ev,
1398                                         struct tevent_signal *se,
1399                                         int signum,
1400                                         int count,
1401                                         void *siginfo,
1402                                         void *private_data)
1403 {
1404         struct smbd_parent_context *parent =
1405                 talloc_get_type_abort(private_data,
1406                 struct smbd_parent_context);
1407
1408         change_to_root_user();
1409         DEBUG(1,("parent: Reloading services after SIGHUP\n"));
1410         reload_services(NULL, NULL, false);
1411
1412         printing_subsystem_update(parent->ev_ctx, parent->msg_ctx, true);
1413 }
1414
1415 struct smbd_claim_version_state {
1416         TALLOC_CTX *mem_ctx;
1417         char *version;
1418 };
1419
1420 static void smbd_claim_version_parser(const struct g_lock_rec *locks,
1421                                       size_t num_locks,
1422                                       const uint8_t *data,
1423                                       size_t datalen,
1424                                       void *private_data)
1425 {
1426         struct smbd_claim_version_state *state = private_data;
1427
1428         if (datalen == 0) {
1429                 state->version = NULL;
1430                 return;
1431         }
1432         if (data[datalen-1] != '\0') {
1433                 DBG_WARNING("Invalid samba version\n");
1434                 dump_data(DBGLVL_WARNING, data, datalen);
1435                 state->version = NULL;
1436                 return;
1437         }
1438         state->version = talloc_strdup(state->mem_ctx, (const char *)data);
1439 }
1440
1441 static NTSTATUS smbd_claim_version(struct messaging_context *msg,
1442                                    const char *version)
1443 {
1444         const char *name = "samba_version_string";
1445         struct smbd_claim_version_state state;
1446         struct g_lock_ctx *ctx;
1447         NTSTATUS status;
1448
1449         ctx = g_lock_ctx_init(msg, msg);
1450         if (ctx == NULL) {
1451                 DBG_WARNING("g_lock_ctx_init failed\n");
1452                 return NT_STATUS_UNSUCCESSFUL;
1453         }
1454
1455         status = g_lock_lock(ctx, string_term_tdb_data(name), G_LOCK_READ,
1456                              (struct timeval) { .tv_sec = 60 });
1457         if (!NT_STATUS_IS_OK(status)) {
1458                 DBG_WARNING("g_lock_lock(G_LOCK_READ) failed: %s\n",
1459                             nt_errstr(status));
1460                 TALLOC_FREE(ctx);
1461                 return status;
1462         }
1463
1464         state = (struct smbd_claim_version_state) { .mem_ctx = ctx };
1465
1466         status = g_lock_dump(ctx, string_term_tdb_data(name),
1467                              smbd_claim_version_parser, &state);
1468         if (!NT_STATUS_IS_OK(status) &&
1469             !NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
1470                 DBG_ERR("Could not read samba_version_string\n");
1471                 g_lock_unlock(ctx, string_term_tdb_data(name));
1472                 TALLOC_FREE(ctx);
1473                 return status;
1474         }
1475
1476         if ((state.version != NULL) && (strcmp(version, state.version) == 0)) {
1477                 /*
1478                  * Leave the read lock for us around. Someone else already
1479                  * set the version correctly
1480                  */
1481                 TALLOC_FREE(ctx);
1482                 return NT_STATUS_OK;
1483         }
1484
1485         status = g_lock_lock(ctx, string_term_tdb_data(name), G_LOCK_WRITE,
1486                              (struct timeval) { .tv_sec = 60 });
1487         if (!NT_STATUS_IS_OK(status)) {
1488                 DBG_WARNING("g_lock_lock(G_LOCK_WRITE) failed: %s\n",
1489                             nt_errstr(status));
1490                 DBG_ERR("smbd %s already running, refusing to start "
1491                         "version %s\n", state.version, version);
1492                 TALLOC_FREE(ctx);
1493                 return NT_STATUS_SXS_VERSION_CONFLICT;
1494         }
1495
1496         status = g_lock_write_data(ctx, string_term_tdb_data(name),
1497                                    (const uint8_t *)version,
1498                                    strlen(version)+1);
1499         if (!NT_STATUS_IS_OK(status)) {
1500                 DBG_WARNING("g_lock_write_data failed: %s\n",
1501                             nt_errstr(status));
1502                 TALLOC_FREE(ctx);
1503                 return status;
1504         }
1505
1506         status = g_lock_lock(ctx, string_term_tdb_data(name), G_LOCK_READ,
1507                              (struct timeval) { .tv_sec = 60 });
1508         if (!NT_STATUS_IS_OK(status)) {
1509                 DBG_WARNING("g_lock_lock(G_LOCK_READ) failed: %s\n",
1510                             nt_errstr(status));
1511                 TALLOC_FREE(ctx);
1512                 return status;
1513         }
1514
1515         /*
1516          * Leave "ctx" dangling so that g_lock.tdb keeps opened.
1517          */
1518         return NT_STATUS_OK;
1519 }
1520
1521 /****************************************************************************
1522  main program.
1523 ****************************************************************************/
1524
1525 /* Declare prototype for build_options() to avoid having to run it through
1526    mkproto.h.  Mixing $(builddir) and $(srcdir) source files in the current
1527    prototype generation system is too complicated. */
1528
1529 extern void build_options(bool screen);
1530
1531  int main(int argc,const char *argv[])
1532 {
1533         /* shall I run as a daemon */
1534         bool is_daemon = false;
1535         bool interactive = false;
1536         bool Fork = true;
1537         bool no_process_group = false;
1538         bool log_stdout = false;
1539         char *ports = NULL;
1540         char *profile_level = NULL;
1541         int opt;
1542         poptContext pc;
1543         bool print_build_options = False;
1544         struct server_id main_server_id = {0};
1545         enum {
1546                 OPT_DAEMON = 1000,
1547                 OPT_INTERACTIVE,
1548                 OPT_FORK,
1549                 OPT_NO_PROCESS_GROUP,
1550                 OPT_LOG_STDOUT
1551         };
1552         struct poptOption long_options[] = {
1553                 POPT_AUTOHELP
1554                 {
1555                         .longName   = "daemon",
1556                         .shortName  = 'D',
1557                         .argInfo    = POPT_ARG_NONE,
1558                         .arg        = NULL,
1559                         .val        = OPT_DAEMON,
1560                         .descrip    = "Become a daemon (default)" ,
1561                 },
1562                 {
1563                         .longName   = "interactive",
1564                         .shortName  = 'i',
1565                         .argInfo    = POPT_ARG_NONE,
1566                         .arg        = NULL,
1567                         .val        = OPT_INTERACTIVE,
1568                         .descrip    = "Run interactive (not a daemon) and log to stdout",
1569                 },
1570                 {
1571                         .longName   = "foreground",
1572                         .shortName  = 'F',
1573                         .argInfo    = POPT_ARG_NONE,
1574                         .arg        = NULL,
1575                         .val        = OPT_FORK,
1576                         .descrip    = "Run daemon in foreground (for daemontools, etc.)",
1577                 },
1578                 {
1579                         .longName   = "no-process-group",
1580                         .shortName  = '\0',
1581                         .argInfo    = POPT_ARG_NONE,
1582                         .arg        = NULL,
1583                         .val        = OPT_NO_PROCESS_GROUP,
1584                         .descrip    = "Don't create a new process group" ,
1585                 },
1586                 {
1587                         .longName   = "log-stdout",
1588                         .shortName  = 'S',
1589                         .argInfo    = POPT_ARG_NONE,
1590                         .arg        = NULL,
1591                         .val        = OPT_LOG_STDOUT,
1592                         .descrip    = "Log to stdout" ,
1593                 },
1594                 {
1595                         .longName   = "build-options",
1596                         .shortName  = 'b',
1597                         .argInfo    = POPT_ARG_NONE,
1598                         .arg        = NULL,
1599                         .val        = 'b',
1600                         .descrip    = "Print build options" ,
1601                 },
1602                 {
1603                         .longName   = "port",
1604                         .shortName  = 'p',
1605                         .argInfo    = POPT_ARG_STRING,
1606                         .arg        = &ports,
1607                         .val        = 0,
1608                         .descrip    = "Listen on the specified ports",
1609                 },
1610                 {
1611                         .longName   = "profiling-level",
1612                         .shortName  = 'P',
1613                         .argInfo    = POPT_ARG_STRING,
1614                         .arg        = &profile_level,
1615                         .val        = 0,
1616                         .descrip    = "Set profiling level","PROFILE_LEVEL",
1617                 },
1618                 POPT_COMMON_SAMBA
1619                 POPT_TABLEEND
1620         };
1621         struct smbd_parent_context *parent = NULL;
1622         TALLOC_CTX *frame;
1623         NTSTATUS status;
1624         struct tevent_context *ev_ctx;
1625         struct messaging_context *msg_ctx;
1626         struct server_id server_id;
1627         struct tevent_signal *se;
1628         int profiling_level;
1629         char *np_dir = NULL;
1630         static const struct smbd_shim smbd_shim_fns =
1631         {
1632                 .send_stat_cache_delete_message = smbd_send_stat_cache_delete_message,
1633                 .change_to_root_user = smbd_change_to_root_user,
1634                 .become_authenticated_pipe_user = smbd_become_authenticated_pipe_user,
1635                 .unbecome_authenticated_pipe_user = smbd_unbecome_authenticated_pipe_user,
1636
1637                 .contend_level2_oplocks_begin = smbd_contend_level2_oplocks_begin,
1638                 .contend_level2_oplocks_end = smbd_contend_level2_oplocks_end,
1639
1640                 .become_root = smbd_become_root,
1641                 .unbecome_root = smbd_unbecome_root,
1642
1643                 .exit_server = smbd_exit_server,
1644                 .exit_server_cleanly = smbd_exit_server_cleanly,
1645         };
1646
1647         /*
1648          * Do this before any other talloc operation
1649          */
1650         talloc_enable_null_tracking();
1651         frame = talloc_stackframe();
1652
1653         setup_logging(argv[0], DEBUG_DEFAULT_STDOUT);
1654
1655         smb_init_locale();
1656
1657         set_smbd_shim(&smbd_shim_fns);
1658
1659         smbd_init_globals();
1660
1661         TimeInit();
1662
1663 #ifdef HAVE_SET_AUTH_PARAMETERS
1664         set_auth_parameters(argc,argv);
1665 #endif
1666
1667         pc = poptGetContext("smbd", argc, argv, long_options, 0);
1668         while((opt = poptGetNextOpt(pc)) != -1) {
1669                 switch (opt)  {
1670                 case OPT_DAEMON:
1671                         is_daemon = true;
1672                         break;
1673                 case OPT_INTERACTIVE:
1674                         interactive = true;
1675                         break;
1676                 case OPT_FORK:
1677                         Fork = false;
1678                         break;
1679                 case OPT_NO_PROCESS_GROUP:
1680                         no_process_group = true;
1681                         break;
1682                 case OPT_LOG_STDOUT:
1683                         log_stdout = true;
1684                         break;
1685                 case 'b':
1686                         print_build_options = True;
1687                         break;
1688                 default:
1689                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1690                                   poptBadOption(pc, 0), poptStrerror(opt));
1691                         poptPrintUsage(pc, stderr, 0);
1692                         exit(1);
1693                 }
1694         }
1695         poptFreeContext(pc);
1696
1697         if (interactive) {
1698                 Fork = False;
1699                 log_stdout = True;
1700         }
1701
1702         if (log_stdout) {
1703                 setup_logging(argv[0], DEBUG_STDOUT);
1704         } else {
1705                 setup_logging(argv[0], DEBUG_FILE);
1706         }
1707
1708         if (print_build_options) {
1709                 build_options(True); /* Display output to screen as well as debug */
1710                 exit(0);
1711         }
1712
1713 #ifdef HAVE_SETLUID
1714         /* needed for SecureWare on SCO */
1715         setluid(0);
1716 #endif
1717
1718         set_remote_machine_name("smbd", False);
1719
1720         if (interactive && (DEBUGLEVEL >= 9)) {
1721                 talloc_enable_leak_report();
1722         }
1723
1724         if (log_stdout && Fork) {
1725                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
1726                 exit(1);
1727         }
1728
1729         /*
1730          * We want to die early if we can't open /dev/urandom
1731          */
1732         generate_random_buffer(NULL, 0);
1733
1734         /* get initial effective uid and gid */
1735         sec_init();
1736
1737         /* make absolutely sure we run as root - to handle cases where people
1738            are crazy enough to have it setuid */
1739         gain_root_privilege();
1740         gain_root_group_privilege();
1741
1742         fault_setup();
1743         dump_core_setup("smbd", lp_logfile(talloc_tos()));
1744
1745         /* we are never interested in SIGPIPE */
1746         BlockSignals(True,SIGPIPE);
1747
1748 #if defined(SIGFPE)
1749         /* we are never interested in SIGFPE */
1750         BlockSignals(True,SIGFPE);
1751 #endif
1752
1753 #if defined(SIGUSR2)
1754         /* We are no longer interested in USR2 */
1755         BlockSignals(True,SIGUSR2);
1756 #endif
1757
1758         /* POSIX demands that signals are inherited. If the invoking process has
1759          * these signals masked, we will have problems, as we won't recieve them. */
1760         BlockSignals(False, SIGHUP);
1761         BlockSignals(False, SIGUSR1);
1762         BlockSignals(False, SIGTERM);
1763
1764         /* Ensure we leave no zombies until we
1765          * correctly set up child handling below. */
1766
1767         CatchChild();
1768
1769         /* we want total control over the permissions on created files,
1770            so set our umask to 0 */
1771         umask(0);
1772
1773         reopen_logs();
1774
1775         DEBUG(0,("smbd version %s started.\n", samba_version_string()));
1776         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1777
1778         DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
1779                  (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
1780
1781         /* Output the build options to the debug log */ 
1782         build_options(False);
1783
1784         if (sizeof(uint16_t) < 2 || sizeof(uint32_t) < 4) {
1785                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
1786                 exit(1);
1787         }
1788
1789         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1790                 DEBUG(0, ("error opening config file '%s'\n", get_dyn_CONFIGFILE()));
1791                 exit(1);
1792         }
1793
1794         /*
1795          * This calls unshare(CLONE_FS); on linux
1796          * in order to check if the running kernel/container
1797          * environment supports it.
1798          */
1799         per_thread_cwd_check();
1800
1801         if (!cluster_probe_ok()) {
1802                 exit(1);
1803         }
1804
1805         /* Init the security context and global current_user */
1806         init_sec_ctx();
1807
1808         /*
1809          * Initialize the event context. The event context needs to be
1810          * initialized before the messaging context, cause the messaging
1811          * context holds an event context.
1812          */
1813         ev_ctx = global_event_context();
1814         if (ev_ctx == NULL) {
1815                 exit(1);
1816         }
1817
1818         /*
1819          * Init the messaging context
1820          * FIXME: This should only call messaging_init()
1821          */
1822         msg_ctx = global_messaging_context();
1823         if (msg_ctx == NULL) {
1824                 exit(1);
1825         }
1826
1827         /*
1828          * Reloading of the printers will not work here as we don't have a
1829          * server info and rpc services set up. It will be called later.
1830          */
1831         if (!reload_services(NULL, NULL, false)) {
1832                 exit(1);
1833         }
1834
1835         if (lp_server_role() == ROLE_ACTIVE_DIRECTORY_DC
1836             && !lp_parm_bool(-1, "server role check", "inhibit", false)) {
1837                 DEBUG(0, ("server role = 'active directory domain controller' not compatible with running smbd standalone. \n"));
1838                 DEBUGADD(0, ("You should start 'samba' instead, and it will control starting smbd if required\n"));
1839                 exit(1);
1840         }
1841
1842         /* ...NOTE... Log files are working from this point! */
1843
1844         DEBUG(3,("loaded services\n"));
1845
1846         init_structs();
1847
1848         if (!profile_setup(msg_ctx, False)) {
1849                 DEBUG(0,("ERROR: failed to setup profiling\n"));
1850                 return -1;
1851         }
1852
1853         if (profile_level != NULL) {
1854                 profiling_level = atoi(profile_level);
1855         } else {
1856                 profiling_level = lp_smbd_profiling_level();
1857         }
1858         main_server_id = messaging_server_id(msg_ctx);
1859         set_profile_level(profiling_level, &main_server_id);
1860
1861         if (!is_daemon && !is_a_socket(0)) {
1862                 if (!interactive) {
1863                         DEBUG(3, ("Standard input is not a socket, "
1864                                   "assuming -D option\n"));
1865                 }
1866
1867                 /*
1868                  * Setting is_daemon here prevents us from eventually calling
1869                  * the open_sockets_inetd()
1870                  */
1871
1872                 is_daemon = True;
1873         }
1874
1875         if (is_daemon && !interactive) {
1876                 DEBUG(3, ("Becoming a daemon.\n"));
1877                 become_daemon(Fork, no_process_group, log_stdout);
1878         }
1879
1880 #ifdef HAVE_SETPGID
1881         /*
1882          * If we're interactive we want to set our own process group for
1883          * signal management.
1884          */
1885         if (interactive && !no_process_group)
1886                 setpgid( (pid_t)0, (pid_t)0);
1887 #endif
1888
1889         if (!directory_exist(lp_lock_directory()))
1890                 mkdir(lp_lock_directory(), 0755);
1891
1892         if (!directory_exist(lp_pid_directory()))
1893                 mkdir(lp_pid_directory(), 0755);
1894
1895         if (is_daemon)
1896                 pidfile_create(lp_pid_directory(), "smbd");
1897
1898         status = reinit_after_fork(msg_ctx, ev_ctx, false, NULL);
1899         if (!NT_STATUS_IS_OK(status)) {
1900                 exit_daemon("reinit_after_fork() failed", map_errno_from_nt_status(status));
1901         }
1902
1903         if (!interactive) {
1904                 /*
1905                  * Do not initialize the parent-child-pipe before becoming a
1906                  * daemon: this is used to detect a died parent in the child
1907                  * process.
1908                  */
1909                 status = init_before_fork();
1910                 if (!NT_STATUS_IS_OK(status)) {
1911                         exit_daemon(nt_errstr(status), map_errno_from_nt_status(status));
1912                 }
1913         }
1914
1915         parent = talloc_zero(ev_ctx, struct smbd_parent_context);
1916         if (!parent) {
1917                 exit_server("talloc(struct smbd_parent_context) failed");
1918         }
1919         parent->interactive = interactive;
1920         parent->ev_ctx = ev_ctx;
1921         parent->msg_ctx = msg_ctx;
1922         am_parent = parent;
1923
1924         se = tevent_add_signal(parent->ev_ctx,
1925                                parent,
1926                                SIGTERM, 0,
1927                                smbd_parent_sig_term_handler,
1928                                parent);
1929         if (!se) {
1930                 exit_server("failed to setup SIGTERM handler");
1931         }
1932         se = tevent_add_signal(parent->ev_ctx,
1933                                parent,
1934                                SIGHUP, 0,
1935                                smbd_parent_sig_hup_handler,
1936                                parent);
1937         if (!se) {
1938                 exit_server("failed to setup SIGHUP handler");
1939         }
1940
1941         /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1942
1943         if (smbd_memcache() == NULL) {
1944                 exit_daemon("no memcache available", EACCES);
1945         }
1946
1947         memcache_set_global(smbd_memcache());
1948
1949         /* Initialise the password backed before the global_sam_sid
1950            to ensure that we fetch from ldap before we make a domain sid up */
1951
1952         if(!initialize_password_db(false, ev_ctx))
1953                 exit(1);
1954
1955         if (!secrets_init()) {
1956                 exit_daemon("smbd can not open secrets.tdb", EACCES);
1957         }
1958
1959         if (lp_server_role() == ROLE_DOMAIN_BDC || lp_server_role() == ROLE_DOMAIN_PDC) {
1960                 struct loadparm_context *lp_ctx = loadparm_init_s3(NULL, loadparm_s3_helpers());
1961                 if (!open_schannel_session_store(NULL, lp_ctx)) {
1962                         exit_daemon("ERROR: Samba cannot open schannel store for secured NETLOGON operations.", EACCES);
1963                 }
1964                 TALLOC_FREE(lp_ctx);
1965         }
1966
1967         if(!get_global_sam_sid()) {
1968                 exit_daemon("Samba cannot create a SAM SID", EACCES);
1969         }
1970
1971         server_id = messaging_server_id(msg_ctx);
1972         status = smbXsrv_version_global_init(&server_id);
1973         if (!NT_STATUS_IS_OK(status)) {
1974                 exit_daemon("Samba cannot init server context", EACCES);
1975         }
1976
1977         status = smbXsrv_client_global_init();
1978         if (!NT_STATUS_IS_OK(status)) {
1979                 exit_daemon("Samba cannot init clients context", EACCES);
1980         }
1981
1982         status = smbXsrv_session_global_init(msg_ctx);
1983         if (!NT_STATUS_IS_OK(status)) {
1984                 exit_daemon("Samba cannot init session context", EACCES);
1985         }
1986
1987         status = smbXsrv_tcon_global_init();
1988         if (!NT_STATUS_IS_OK(status)) {
1989                 exit_daemon("Samba cannot init tcon context", EACCES);
1990         }
1991
1992         if (!locking_init())
1993                 exit_daemon("Samba cannot init locking", EACCES);
1994
1995         if (!leases_db_init(false)) {
1996                 exit_daemon("Samba cannot init leases", EACCES);
1997         }
1998
1999         if (!smbd_notifyd_init(msg_ctx, interactive, &parent->notifyd)) {
2000                 exit_daemon("Samba cannot init notification", EACCES);
2001         }
2002
2003         if (!cleanupd_init(msg_ctx, interactive, &parent->cleanupd)) {
2004                 exit_daemon("Samba cannot init the cleanupd", EACCES);
2005         }
2006
2007         if (!messaging_parent_dgm_cleanup_init(msg_ctx)) {
2008                 exit(1);
2009         }
2010
2011         if (!smbd_scavenger_init(NULL, msg_ctx, ev_ctx)) {
2012                 exit_daemon("Samba cannot init scavenging", EACCES);
2013         }
2014
2015         if (!W_ERROR_IS_OK(registry_init_full()))
2016                 exit_daemon("Samba cannot init registry", EACCES);
2017
2018         /* Open the share_info.tdb here, so we don't have to open
2019            after the fork on every single connection.  This is a small
2020            performance improvment and reduces the total number of system
2021            fds used. */
2022         if (!share_info_db_init()) {
2023                 exit_daemon("ERROR: failed to load share info db.", EACCES);
2024         }
2025
2026         status = init_system_session_info(NULL);
2027         if (!NT_STATUS_IS_OK(status)) {
2028                 DEBUG(1, ("ERROR: failed to setup system user info: %s.\n",
2029                           nt_errstr(status)));
2030                 return -1;
2031         }
2032
2033         if (!init_guest_session_info(NULL)) {
2034                 DEBUG(0,("ERROR: failed to setup guest info.\n"));
2035                 return -1;
2036         }
2037
2038         if (!file_init_global()) {
2039                 DEBUG(0, ("ERROR: file_init_global() failed\n"));
2040                 return -1;
2041         }
2042         status = smbXsrv_open_global_init();
2043         if (!NT_STATUS_IS_OK(status)) {
2044                 exit_daemon("Samba cannot init global open", map_errno_from_nt_status(status));
2045         }
2046
2047         if (lp_clustering() && !lp_allow_unsafe_cluster_upgrade()) {
2048                 status = smbd_claim_version(msg_ctx, samba_version_string());
2049                 if (!NT_STATUS_IS_OK(status)) {
2050                         DBG_ERR("Could not claim version: %s\n",
2051                                     nt_errstr(status));
2052                         return -1;
2053                 }
2054         }
2055
2056         /* This MUST be done before start_epmd() because otherwise
2057          * start_epmd() forks and races against dcesrv_ep_setup() to
2058          * call directory_create_or_exist() */
2059         if (!directory_create_or_exist(lp_ncalrpc_dir(), 0755)) {
2060                 DEBUG(0, ("Failed to create pipe directory %s - %s\n",
2061                           lp_ncalrpc_dir(), strerror(errno)));
2062                 return -1;
2063         }
2064
2065         np_dir = talloc_asprintf(talloc_tos(), "%s/np", lp_ncalrpc_dir());
2066         if (!np_dir) {
2067                 DEBUG(0, ("%s: Out of memory\n", __location__));
2068                 return -1;
2069         }
2070
2071         if (!directory_create_or_exist_strict(np_dir, geteuid(), 0700)) {
2072                 DEBUG(0, ("Failed to create pipe directory %s - %s\n",
2073                           np_dir, strerror(errno)));
2074                 return -1;
2075         }
2076
2077         if (is_daemon && !interactive) {
2078                 if (rpc_epmapper_daemon() == RPC_DAEMON_FORK) {
2079                         start_epmd(ev_ctx, msg_ctx);
2080                 }
2081         }
2082
2083         status = dcesrv_ep_setup(ev_ctx, msg_ctx);
2084         if (!NT_STATUS_IS_OK(status)) {
2085                 DBG_ERR("Failed to setup RPC server: %s\n", nt_errstr(status));
2086                 exit_daemon("Samba cannot setup ep pipe", EACCES);
2087         }
2088
2089         if (is_daemon && !interactive) {
2090                 daemon_ready("smbd");
2091         }
2092
2093         /* only start other daemons if we are running as a daemon
2094          * -- bad things will happen if smbd is launched via inetd
2095          *  and we fork a copy of ourselves here */
2096         if (is_daemon && !interactive) {
2097
2098                 if (rpc_lsasd_daemon() == RPC_DAEMON_FORK) {
2099                         start_lsasd(ev_ctx, msg_ctx);
2100                 }
2101
2102                 if (rpc_fss_daemon() == RPC_DAEMON_FORK) {
2103                         start_fssd(ev_ctx, msg_ctx);
2104                 }
2105
2106                 if (!lp__disable_spoolss() &&
2107                     (rpc_spoolss_daemon() != RPC_DAEMON_DISABLED)) {
2108                         bool bgq = lp_parm_bool(-1, "smbd", "backgroundqueue", true);
2109
2110                         if (!printing_subsystem_init(ev_ctx, msg_ctx, true, bgq)) {
2111                                 exit_daemon("Samba failed to init printing subsystem", EACCES);
2112                         }
2113                 }
2114
2115 #ifdef WITH_SPOTLIGHT
2116                 if ((rpc_mdssvc_mode() == RPC_SERVICE_MODE_EXTERNAL) &&
2117                     (rpc_mdssd_daemon() == RPC_DAEMON_FORK)) {
2118                         start_mdssd(ev_ctx, msg_ctx);
2119                 }
2120 #endif
2121         } else if (!lp__disable_spoolss() &&
2122                    (rpc_spoolss_daemon() != RPC_DAEMON_DISABLED)) {
2123                 if (!printing_subsystem_init(ev_ctx, msg_ctx, false, false)) {
2124                         exit(1);
2125                 }
2126         }
2127
2128         if (!is_daemon) {
2129                 int sock;
2130
2131                 /* inetd mode */
2132                 TALLOC_FREE(frame);
2133
2134                 /* Started from inetd. fd 0 is the socket. */
2135                 /* We will abort gracefully when the client or remote system
2136                    goes away */
2137                 sock = dup(0);
2138
2139                 /* close stdin, stdout (if not logging to it), but not stderr */
2140                 close_low_fds(true, !debug_get_output_is_stdout(), false);
2141
2142 #ifdef HAVE_ATEXIT
2143                 atexit(killkids);
2144 #endif
2145
2146                 /* Stop zombies */
2147                 smbd_setup_sig_chld_handler(parent);
2148
2149                 smbd_process(ev_ctx, msg_ctx, sock, true);
2150
2151                 exit_server_cleanly(NULL);
2152                 return(0);
2153         }
2154
2155         if (!open_sockets_smbd(parent, ev_ctx, msg_ctx, ports))
2156                 exit_server("open_sockets_smbd() failed");
2157
2158         /* do a printer update now that all messaging has been set up,
2159          * before we allow clients to start connecting */
2160         if (!lp__disable_spoolss() &&
2161             (rpc_spoolss_daemon() != RPC_DAEMON_DISABLED)) {
2162                 printing_subsystem_update(ev_ctx, msg_ctx, false);
2163         }
2164
2165         TALLOC_FREE(frame);
2166         /* make sure we always have a valid stackframe */
2167         frame = talloc_stackframe();
2168
2169         if (!Fork) {
2170                 /* if we are running in the foreground then look for
2171                    EOF on stdin, and exit if it happens. This allows
2172                    us to die if the parent process dies
2173                    Only do this on a pipe or socket, no other device.
2174                 */
2175                 struct stat st;
2176                 if (fstat(0, &st) != 0) {
2177                         return false;
2178                 }
2179                 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode)) {
2180                         tevent_add_fd(ev_ctx,
2181                                         parent,
2182                                         0,
2183                                         TEVENT_FD_READ,
2184                                         smbd_stdin_handler,
2185                                         NULL);
2186                 }
2187         }
2188
2189         smbd_parent_loop(ev_ctx, parent);
2190
2191         exit_server_cleanly(NULL);
2192         TALLOC_FREE(frame);
2193         return(0);
2194 }