summaryrefslogtreecommitdiff
path: root/source3/printing/spoolssd.c
blob: 06ce61b9cde15dc5799934ee40c93fcbf7c2bc27 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
/*
   Unix SMB/Netbios implementation.
   SPOOLSS Daemon
   Copyright (C) Simo Sorce <idra@samba.org> 2010-2011

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "serverid.h"
#include "smbd/smbd.h"

#include "messages.h"
#include "include/printing.h"
#include "printing/nt_printing_migrate_internal.h"
#include "printing/queue_process.h"
#include "printing/pcap.h"
#include "printing/load.h"
#include "ntdomain.h"
#include "librpc/gen_ndr/srv_winreg.h"
#include "librpc/gen_ndr/srv_spoolss.h"
#include "rpc_server/rpc_server.h"
#include "rpc_server/rpc_ep_register.h"
#include "rpc_server/spoolss/srv_spoolss_nt.h"
#include "librpc/rpc/dcerpc_ep.h"
#include "lib/server_prefork.h"
#include "lib/server_prefork_util.h"

#define SPOOLSS_PIPE_NAME "spoolss"
#define DAEMON_NAME "spoolssd"

static struct server_id parent_id;
static struct prefork_pool *spoolss_pool = NULL;
static int spoolss_child_id = 0;

static struct pf_daemon_config default_pf_spoolss_cfg = {
	.prefork_status = PFH_INIT,
	.min_children = 5,
	.max_children = 25,
	.spawn_rate = 5,
	.max_allowed_clients = 100,
	.child_min_life = 60 /* 1 minute minimum life time */
};
static struct pf_daemon_config pf_spoolss_cfg = { 0 };

pid_t start_spoolssd(struct tevent_context *ev_ctx,
		     struct messaging_context *msg_ctx);

static void spoolss_reopen_logs(int child_id)
{
	char *lfile = lp_logfile();
	char *ext;
	int rc;

	if (child_id) {
		rc = asprintf(&ext, "%s.%d", DAEMON_NAME, child_id);
	} else {
		rc = asprintf(&ext, "%s", DAEMON_NAME);
	}

	if (rc == -1) {
		return;
	}

	rc = 0;
	if (lfile == NULL || lfile[0] == '\0') {
		rc = asprintf(&lfile, "%s/log.%s",
			      get_dyn_LOGFILEBASE(), ext);
	} else {
		if (strstr(lfile, ext) == NULL) {
			if (child_id) {
				rc = asprintf(&lfile, "%s.%d",
					      lp_logfile(), child_id);
			} else {
				rc = asprintf(&lfile, "%s.%s",
					      lp_logfile(), ext);
			}
		}
	}

	if (rc > 0) {
		lp_set_logfile(lfile);
		SAFE_FREE(lfile);
	}

	SAFE_FREE(ext);

	reopen_logs();
}

static void update_conf(struct tevent_context *ev,
			struct messaging_context *msg)
{
	change_to_root_user();
	lp_load(get_dyn_CONFIGFILE(), true, false, false, true);
	load_printers(ev, msg);

	spoolss_reopen_logs(spoolss_child_id);
	if (spoolss_child_id == 0) {
		pfh_daemon_config(DAEMON_NAME,
				  &pf_spoolss_cfg,
				  &default_pf_spoolss_cfg);
		pfh_manage_pool(ev, msg, &pf_spoolss_cfg, spoolss_pool);
	}
}

static void smb_conf_updated(struct messaging_context *msg,
			     void *private_data,
			     uint32_t msg_type,
			     struct server_id server_id,
			     DATA_BLOB *data)
{
	struct tevent_context *ev_ctx = talloc_get_type_abort(private_data,
							     struct tevent_context);

	DEBUG(10, ("Got message saying smb.conf was updated. Reloading.\n"));
	update_conf(ev_ctx, msg);
}

static void update_pcap(struct tevent_context *ev_ctx,
			struct messaging_context *msg_ctx)
{
	change_to_root_user();
	delete_and_reload_printers(ev_ctx, msg_ctx);
}

static void pcap_updated(struct messaging_context *msg,
			 void *private_data,
			 uint32_t msg_type,
			 struct server_id server_id,
			 DATA_BLOB *data)
{
	struct tevent_context *ev_ctx;

	ev_ctx = talloc_get_type_abort(private_data, struct tevent_context);

	DEBUG(10, ("Got message that pcap updated. Reloading.\n"));
	update_pcap(ev_ctx, msg);
}

static void spoolss_sig_term_handler(struct tevent_context *ev,
				     struct tevent_signal *se,
				     int signum,
				     int count,
				     void *siginfo,
				     void *private_data)
{
	exit_server_cleanly("termination signal");
}

static void spoolss_setup_sig_term_handler(struct tevent_context *ev_ctx)
{
	struct tevent_signal *se;

	se = tevent_add_signal(ev_ctx,
			       ev_ctx,
			       SIGTERM, 0,
			       spoolss_sig_term_handler,
			       NULL);
	if (!se) {
		exit_server("failed to setup SIGTERM handler");
	}
}

static void spoolss_sig_hup_handler(struct tevent_context *ev,
				    struct tevent_signal *se,
				    int signum,
				    int count,
				    void *siginfo,
				    void *pvt)
{
	struct messaging_context *msg_ctx;

	msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);

	DEBUG(1,("Reloading printers after SIGHUP\n"));
	update_conf(ev, msg_ctx);

	/* relay to all children */
	if (spoolss_pool) {
		prefork_send_signal_to_all(spoolss_pool, SIGHUP);
	}
}

static void spoolss_setup_sig_hup_handler(struct tevent_context *ev_ctx,
					  struct messaging_context *msg_ctx)
{
	struct tevent_signal *se;

	se = tevent_add_signal(ev_ctx,
			       ev_ctx,
			       SIGHUP, 0,
			       spoolss_sig_hup_handler,
			       msg_ctx);
	if (!se) {
		exit_server("failed to setup SIGHUP handler");
	}
}

static bool spoolss_init_cb(void *ptr)
{
	struct messaging_context *msg_ctx = talloc_get_type_abort(
		ptr, struct messaging_context);

	return nt_printing_tdb_migrate(msg_ctx);
}

static bool spoolss_shutdown_cb(void *ptr)
{
	srv_spoolss_cleanup();

	return true;
}

/* Children */

static void spoolss_chld_sig_hup_handler(struct tevent_context *ev,
					 struct tevent_signal *se,
					 int signum,
					 int count,
					 void *siginfo,
					 void *pvt)
{
	struct messaging_context *msg_ctx;

	msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);

	change_to_root_user();
	DEBUG(1,("Reloading printers after SIGHUP\n"));
	load_printers(ev, msg_ctx);
	spoolss_reopen_logs(spoolss_child_id);
}

static bool spoolss_setup_chld_hup_handler(struct tevent_context *ev_ctx,
					   struct messaging_context *msg_ctx,
					   struct pf_worker_data *pf)
{
	struct tevent_signal *se;

	se = tevent_add_signal(ev_ctx,
			       ev_ctx,
			       SIGHUP, 0,
			       spoolss_chld_sig_hup_handler,
			       msg_ctx);
	if (!se) {
		DEBUG(1, ("failed to setup SIGHUP handler"));
		return false;
	}

	return true;
}

static void parent_ping(struct messaging_context *msg_ctx,
			void *private_data,
			uint32_t msg_type,
			struct server_id server_id,
			DATA_BLOB *data)
{

	/* The fact we received this message is enough to let make the event
	 * loop if it was idle. spoolss_children_main will cycle through
	 * spoolss_next_client at least once. That function will take whatever
	 * action is necessary */

	DEBUG(10, ("Got message that the parent changed status.\n"));
	return;
}

static bool spoolss_child_init(struct tevent_context *ev_ctx,
			       int child_id, struct pf_worker_data *pf)
{
	NTSTATUS status;
	struct rpc_srv_callbacks spoolss_cb;
	struct messaging_context *msg_ctx = server_messaging_context();
	bool ok;

	status = reinit_after_fork(msg_ctx, ev_ctx,
				   true);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0,("reinit_after_fork() failed\n"));
		smb_panic("reinit_after_fork() failed");
	}

	spoolss_child_id = child_id;
	spoolss_reopen_logs(child_id);

	ok = spoolss_setup_chld_hup_handler(ev_ctx, msg_ctx, pf);
	if (!ok) {
		return false;
	}

	if (!serverid_register(procid_self(),
				FLAG_MSG_GENERAL |
				FLAG_MSG_PRINT_GENERAL)) {
		return false;
	}

	if (!locking_init()) {
		return false;
	}

	messaging_register(msg_ctx, ev_ctx,
			   MSG_SMB_CONF_UPDATED, smb_conf_updated);
	messaging_register(msg_ctx, ev_ctx, MSG_PRINTER_PCAP,
			   pcap_updated);
	messaging_register(msg_ctx, ev_ctx,
			   MSG_PREFORK_PARENT_EVENT, parent_ping);

	/* As soon as messaging is up check if pcap has been loaded already.
	 * If so then we probably missed a message and should load_printers()
	 * ourselves. If pcap has not been loaded yet, then ignore, we will get
	 * a message as soon as the bq process completes the reload. */
	if (pcap_cache_loaded()) {
		load_printers(ev_ctx, msg_ctx);
	}

	/* try to reinit rpc queues */
	spoolss_cb.init = spoolss_init_cb;
	spoolss_cb.shutdown = spoolss_shutdown_cb;
	spoolss_cb.private_data = msg_ctx;

	status = rpc_winreg_init(NULL);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0, ("Failed to register winreg rpc inteface! (%s)\n",
			  nt_errstr(status)));
		return false;
	}

	status = rpc_spoolss_init(&spoolss_cb);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0, ("Failed to register spoolss rpc inteface! (%s)\n",
			  nt_errstr(status)));
		return false;
	}

	return true;
}

struct spoolss_children_data {
	struct tevent_context *ev_ctx;
	struct messaging_context *msg_ctx;
	struct pf_worker_data *pf;
	int listen_fd_size;
	int *listen_fds;
};

static void spoolss_next_client(void *pvt);

static int spoolss_children_main(struct tevent_context *ev_ctx,
				 struct messaging_context *msg_ctx,
				 struct pf_worker_data *pf,
				 int child_id,
				 int listen_fd_size,
				 int *listen_fds,
				 void *private_data)
{
	struct spoolss_children_data *data;
	bool ok;
	int ret;

	ok = spoolss_child_init(ev_ctx, child_id, pf);
	if (!ok) {
		return 1;
	}

	data = talloc(ev_ctx, struct spoolss_children_data);
	if (!data) {
		return 1;
	}
	data->pf = pf;
	data->ev_ctx = ev_ctx;
	data->msg_ctx = msg_ctx;
	data->listen_fd_size = listen_fd_size;
	data->listen_fds = listen_fds;

	/* loop until it is time to exit */
	while (pf->status != PF_WORKER_EXITING) {
		/* try to see if it is time to schedule the next client */
		spoolss_next_client(data);

		ret = tevent_loop_once(ev_ctx);
		if (ret != 0) {
			DEBUG(0, ("tevent_loop_once() exited with %d: %s\n",
				  ret, strerror(errno)));
			pf->status = PF_WORKER_EXITING;
		}
	}

	return ret;
}

static void spoolss_client_terminated(void *pvt)
{
	struct spoolss_children_data *data;

	data = talloc_get_type_abort(pvt, struct spoolss_children_data);

	pfh_client_terminated(data->pf);

	spoolss_next_client(pvt);
}

struct spoolss_new_client {
	struct spoolss_children_data *data;
	struct tsocket_address *srv_addr;
	struct tsocket_address *cli_addr;
};

static void spoolss_handle_client(struct tevent_req *req);

static void spoolss_next_client(void *pvt)
{
	struct tevent_req *req;
	struct spoolss_children_data *data;
	struct spoolss_new_client *next;

	data = talloc_get_type_abort(pvt, struct spoolss_children_data);

	if (!pfh_child_allowed_to_accept(data->pf)) {
		/* nothing to do for now we are already listening
		 * or we are not allowed to listen further */
		return;
	}

	next = talloc_zero(data, struct spoolss_new_client);
	if (!next) {
		DEBUG(1, ("Out of memory!?\n"));
		return;
	}
	next->data = data;

	req = prefork_listen_send(next, data->ev_ctx, data->pf,
				  data->listen_fd_size,
				  data->listen_fds);
	if (!req) {
		DEBUG(1, ("Failed to make listening request!?\n"));
		talloc_free(next);
		return;
	}
	tevent_req_set_callback(req, spoolss_handle_client, next);
}

static void spoolss_handle_client(struct tevent_req *req)
{
	struct spoolss_children_data *data;
	struct spoolss_new_client *client;
	const DATA_BLOB ping = data_blob_null;
	int ret;
	int sd;

	client = tevent_req_callback_data(req, struct spoolss_new_client);
	data = client->data;

	ret = prefork_listen_recv(req, client, &sd,
				  &client->srv_addr, &client->cli_addr);

	/* this will free the request too */
	talloc_free(client);

	if (ret != 0) {
		DEBUG(6, ("No client connection was available after all!\n"));
		return;
	}

	/* Warn parent that our status changed */
	messaging_send(data->msg_ctx, parent_id,
			MSG_PREFORK_CHILD_EVENT, &ping);

	DEBUG(2, ("Spoolss preforked child %d got client connection!\n",
		  (int)(data->pf->pid)));

	named_pipe_accept_function(data->ev_ctx, data->msg_ctx,
				   SPOOLSS_PIPE_NAME, sd,
				   spoolss_client_terminated, data);
}

/* ==== Main Process Functions ==== */

extern pid_t background_lpq_updater_pid;
static char *bq_logfile;

static void check_updater_child(void)
{
	int status;
	pid_t pid;

	if (background_lpq_updater_pid == -1) {
		return;
	}

	pid = sys_waitpid(background_lpq_updater_pid, &status, WNOHANG);
	if (pid > 0) {
		DEBUG(2, ("The background queue child died... Restarting!\n"));
		pid = start_background_queue(server_event_context(),
					     server_messaging_context(),
					     bq_logfile);
		background_lpq_updater_pid = pid;
	}
}

static void child_ping(struct messaging_context *msg_ctx,
			void *private_data,
			uint32_t msg_type,
			struct server_id server_id,
			DATA_BLOB *data)
{
	struct tevent_context *ev_ctx;

	ev_ctx = talloc_get_type_abort(private_data, struct tevent_context);

	DEBUG(10, ("Got message that a child changed status.\n"));
	pfh_manage_pool(ev_ctx, msg_ctx, &pf_spoolss_cfg, spoolss_pool);
}

static bool spoolssd_schedule_check(struct tevent_context *ev_ctx,
				    struct messaging_context *msg_ctx,
				    struct timeval current_time);
static void spoolssd_check_children(struct tevent_context *ev_ctx,
				    struct tevent_timer *te,
				    struct timeval current_time,
				    void *pvt);

static void spoolssd_sigchld_handler(struct tevent_context *ev_ctx,
				     struct prefork_pool *pfp,
				     void *pvt)
{
	struct messaging_context *msg_ctx;

	msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);

	/* run pool management so we can fork/retire or increase
	 * the allowed connections per child based on load */
	pfh_manage_pool(ev_ctx, msg_ctx, &pf_spoolss_cfg, spoolss_pool);

	/* also check if the updater child is alive and well */
	check_updater_child();
}

static bool spoolssd_setup_children_monitor(struct tevent_context *ev_ctx,
					    struct messaging_context *msg_ctx)
{
	bool ok;

	/* add our oun sigchld callback */
	prefork_set_sigchld_callback(spoolss_pool,
				     spoolssd_sigchld_handler, msg_ctx);

	ok = spoolssd_schedule_check(ev_ctx, msg_ctx,
				     tevent_timeval_current());
	return ok;
}

static bool spoolssd_schedule_check(struct tevent_context *ev_ctx,
				    struct messaging_context *msg_ctx,
				    struct timeval current_time)
{
	struct tevent_timer *te;
	struct timeval next_event;

	/* check situation again in 10 seconds */
	next_event = tevent_timeval_current_ofs(10, 0);

	/* TODO: check when the socket becomes readable, so that children
	 * are checked only when there is some activity ? */
	te = tevent_add_timer(ev_ctx, spoolss_pool, next_event,
				spoolssd_check_children, msg_ctx);
	if (!te) {
		DEBUG(2, ("Failed to set up children monitoring!\n"));
		return false;
	}

	return true;
}

static void spoolssd_check_children(struct tevent_context *ev_ctx,
				    struct tevent_timer *te,
				    struct timeval current_time,
				    void *pvt)
{
	struct messaging_context *msg_ctx;

	msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);

	pfh_manage_pool(ev_ctx, msg_ctx, &pf_spoolss_cfg, spoolss_pool);

	spoolssd_schedule_check(ev_ctx, msg_ctx, current_time);
}

static void print_queue_forward(struct messaging_context *msg,
				void *private_data,
				uint32_t msg_type,
				struct server_id server_id,
				DATA_BLOB *data)
{
	messaging_send_buf(msg, pid_to_procid(background_lpq_updater_pid),
			   MSG_PRINTER_UPDATE, data->data, data->length);
}

static char *get_bq_logfile(void)
{
	char *lfile = lp_logfile();
	int rc;

	if (lfile == NULL || lfile[0] == '\0') {
		rc = asprintf(&lfile, "%s/log.%s.bq",
					get_dyn_LOGFILEBASE(), DAEMON_NAME);
	} else {
		rc = asprintf(&lfile, "%s.bq", lp_logfile());
	}
	if (rc == -1) {
		lfile = NULL;
	}
	return lfile;
}

pid_t start_spoolssd(struct tevent_context *ev_ctx,
		    struct messaging_context *msg_ctx)
{
	struct rpc_srv_callbacks spoolss_cb;
	struct dcerpc_binding_vector *v;
	TALLOC_CTX *mem_ctx;
	pid_t pid;
	NTSTATUS status;
	int listen_fd;
	int ret;
	bool ok;

	DEBUG(1, ("Forking SPOOLSS Daemon\n"));

	/*
	 * Block signals before forking child as it will have to
	 * set its own handlers. Child will re-enable SIGHUP as
	 * soon as the handlers are set up.
	 */
	BlockSignals(true, SIGTERM);
	BlockSignals(true, SIGHUP);

	pid = sys_fork();

	if (pid == -1) {
		DEBUG(0, ("Failed to fork SPOOLSS [%s]\n",
			   strerror(errno)));
	}

	/* parent or error */
	if (pid != 0) {

		/* Re-enable SIGHUP before returnig */
		BlockSignals(false, SIGTERM);
		BlockSignals(false, SIGHUP);
		return pid;
	}

	/* child */
	close_low_fds(false);

	status = reinit_after_fork(msg_ctx,
				   ev_ctx,
				   true);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0,("reinit_after_fork() failed\n"));
		smb_panic("reinit_after_fork() failed");
	}

	/* save the parent process id so the children can use it later */
	parent_id = procid_self();

	spoolss_reopen_logs(0);
	pfh_daemon_config(DAEMON_NAME,
			  &pf_spoolss_cfg,
			  &default_pf_spoolss_cfg);

	spoolss_setup_sig_term_handler(ev_ctx);
	spoolss_setup_sig_hup_handler(ev_ctx, msg_ctx);

	BlockSignals(false, SIGTERM);
	BlockSignals(false, SIGHUP);

	/* always start the backgroundqueue listner in spoolssd */
	bq_logfile = get_bq_logfile();
	pid = start_background_queue(ev_ctx, msg_ctx, bq_logfile);
	if (pid > 0) {
		background_lpq_updater_pid = pid;
	}

	/* the listening fd must be created before the children are actually
	 * forked out. */
	listen_fd = create_named_pipe_socket(SPOOLSS_PIPE_NAME);
	if (listen_fd == -1) {
		exit(1);
	}

	ret = listen(listen_fd, pf_spoolss_cfg.max_allowed_clients);
	if (ret == -1) {
		DEBUG(0, ("Failed to listen on spoolss pipe - %s\n",
			  strerror(errno)));
		exit(1);
	}

	/* start children before any more initialization is done */
	ok = prefork_create_pool(ev_ctx, /* mem_ctx */
				 ev_ctx, msg_ctx,
				 1, &listen_fd,
				 pf_spoolss_cfg.min_children,
				 pf_spoolss_cfg.max_children,
				 &spoolss_children_main, NULL,
				 &spoolss_pool);
	if (!ok) {
		exit(1);
	}

	if (!serverid_register(procid_self(),
				FLAG_MSG_GENERAL |
				FLAG_MSG_PRINT_GENERAL)) {
		exit(1);
	}

	if (!locking_init()) {
		exit(1);
	}

	messaging_register(msg_ctx, ev_ctx,
			   MSG_SMB_CONF_UPDATED, smb_conf_updated);
	messaging_register(msg_ctx, NULL, MSG_PRINTER_UPDATE,
			   print_queue_forward);
	messaging_register(msg_ctx, ev_ctx, MSG_PRINTER_PCAP,
			   pcap_updated);
	messaging_register(msg_ctx, ev_ctx,
			   MSG_PREFORK_CHILD_EVENT, child_ping);

	/* As soon as messaging is up check if pcap has been loaded already.
	 * If so then we probably missed a message and should load_printers()
	 * ourselves. If pcap has not been loaded yet, then ignore, we will get
	 * a message as soon as the bq process completes the reload. */
	if (pcap_cache_loaded()) {
		load_printers(ev_ctx, msg_ctx);
	}

	mem_ctx = talloc_new(NULL);
	if (mem_ctx == NULL) {
		exit(1);
	}

	/*
	 * Initialize spoolss with an init function to convert printers first.
	 * static_init_rpc will try to initialize the spoolss server too but you
	 * can't register it twice.
	 */
	spoolss_cb.init = spoolss_init_cb;
	spoolss_cb.shutdown = spoolss_shutdown_cb;
	spoolss_cb.private_data = msg_ctx;

	status = rpc_winreg_init(NULL);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0, ("Failed to register winreg rpc inteface! (%s)\n",
			  nt_errstr(status)));
		exit(1);
	}

	status = rpc_spoolss_init(&spoolss_cb);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0, ("Failed to register spoolss rpc inteface! (%s)\n",
			  nt_errstr(status)));
		exit(1);
	}

	status = dcerpc_binding_vector_new(mem_ctx, &v);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0, ("Failed to create binding vector (%s)\n",
			  nt_errstr(status)));
		exit(1);
	}

	status = dcerpc_binding_vector_add_np_default(&ndr_table_spoolss, v);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0, ("Failed to add np to binding vector (%s)\n",
			  nt_errstr(status)));
		exit(1);
	}

	status = rpc_ep_register(ev_ctx, msg_ctx, &ndr_table_spoolss, v);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0, ("Failed to register spoolss endpoint! (%s)\n",
			  nt_errstr(status)));
		exit(1);
	}

	talloc_free(mem_ctx);

	ok = spoolssd_setup_children_monitor(ev_ctx, msg_ctx);
	if (!ok) {
		DEBUG(0, ("Failed to setup children monitoring!\n"));
		exit(1);
	}

	DEBUG(1, ("SPOOLSS Daemon Started (%d)\n", getpid()));

	pfh_manage_pool(ev_ctx, msg_ctx, &pf_spoolss_cfg, spoolss_pool);

	/* loop forever */
	ret = tevent_loop_wait(ev_ctx);

	/* should not be reached */
	DEBUG(0,("spoolssd tevent_loop_wait() exited with %d - %s\n",
		 ret, (ret == 0) ? "out of events" : strerror(errno)));
	exit(1);
}