summaryrefslogtreecommitdiff
path: root/source3/printing/notify.c
blob: 4040a2bab4ddb058f5669d31a234baf3b112a557 (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
/* 
   Unix SMB/Netbios implementation.
   Version 3.0
   printing backend routines
   Copyright (C) Tim Potter, 2002
   Copyright (C) Gerald Carter,         2002
   
   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 "printing.h"
#include "../librpc/gen_ndr/spoolss.h"
#include "nt_printing.h"
#include "printing/notify.h"
#include "messages.h"
#include "util_tdb.h"

static TALLOC_CTX *send_ctx;

static unsigned int num_messages;

static struct notify_queue {
	struct notify_queue *next, *prev;
	struct spoolss_notify_msg *msg;
	struct timeval tv;
	uint8 *buf;
	size_t buflen;
} *notify_queue_head = NULL;

static struct tevent_timer *notify_event;

static bool print_notify_pid_list(const char *printername, TALLOC_CTX *mem_ctx,
				  size_t *p_num_pids, pid_t **pp_pid_list);

static bool create_send_ctx(void)
{
	if (!send_ctx)
		send_ctx = talloc_init("print notify queue");

	if (!send_ctx)
		return False;

	return True;
}

/****************************************************************************
 Turn a queue name into a snum.
****************************************************************************/

int print_queue_snum(const char *qname)
{
	int snum = lp_servicenumber(qname);
	if (snum == -1 || !lp_print_ok(snum))
		return -1;
	return snum;
}

/*******************************************************************
 Used to decide if we need a short select timeout.
*******************************************************************/

static bool print_notify_messages_pending(void)
{
	return (notify_queue_head != NULL);
}

/*******************************************************************
 Flatten data into a message.
*******************************************************************/

static bool flatten_message(struct notify_queue *q)
{
	struct spoolss_notify_msg *msg = q->msg;
	uint8 *buf = NULL;
	size_t buflen = 0, len;

again:
	len = 0;

	/* Pack header */

	len += tdb_pack(buf + len, buflen - len, "f", msg->printer);

	len += tdb_pack(buf + len, buflen - len, "ddddddd",
			(uint32)q->tv.tv_sec, (uint32)q->tv.tv_usec,
			msg->type, msg->field, msg->id, msg->len, msg->flags);

	/* Pack data */

	if (msg->len == 0)
		len += tdb_pack(buf + len, buflen - len, "dd",
				msg->notify.value[0], msg->notify.value[1]);
	else
		len += tdb_pack(buf + len, buflen - len, "B",
				msg->len, msg->notify.data);

	if (buflen != len) {
		buf = (uint8 *)TALLOC_REALLOC(send_ctx, buf, len);
		if (!buf)
			return False;
		buflen = len;
		goto again;
	}

	q->buf = buf;
	q->buflen = buflen;

	return True;
}

/*******************************************************************
 Send the batched messages - on a per-printer basis.
*******************************************************************/

static void print_notify_send_messages_to_printer(struct messaging_context *msg_ctx,
						  const char *printer,
						  unsigned int timeout)
{
	char *buf;
	struct notify_queue *pq, *pq_next;
	size_t msg_count = 0, offset = 0;
	size_t num_pids = 0;
	size_t i;
	pid_t *pid_list = NULL;
	struct timeval end_time = timeval_zero();

	/* Count the space needed to send the messages. */
	for (pq = notify_queue_head; pq; pq = pq->next) {
		if (strequal(printer, pq->msg->printer)) {
			if (!flatten_message(pq)) {
				DEBUG(0,("print_notify_send_messages: Out of memory\n"));
				talloc_free_children(send_ctx);
				num_messages = 0;
				return;
			}
			offset += (pq->buflen + 4);
			msg_count++;
		}	
	}
	offset += 4; /* For count. */

	buf = (char *)TALLOC(send_ctx, offset);
	if (!buf) {
		DEBUG(0,("print_notify_send_messages: Out of memory\n"));
		talloc_free_children(send_ctx);
		num_messages = 0;
		return;
	}

	offset = 0;
	SIVAL(buf,offset,msg_count);
	offset += 4;
	for (pq = notify_queue_head; pq; pq = pq_next) {
		pq_next = pq->next;

		if (strequal(printer, pq->msg->printer)) {
			SIVAL(buf,offset,pq->buflen);
			offset += 4;
			memcpy(buf + offset, pq->buf, pq->buflen);
			offset += pq->buflen;

			/* Remove from list. */
			DLIST_REMOVE(notify_queue_head, pq);
		}
	}

	DEBUG(5, ("print_notify_send_messages_to_printer: sending %lu print notify message%s to printer %s\n", 
		  (unsigned long)msg_count, msg_count != 1 ? "s" : "", printer));

	/*
	 * Get the list of PID's to send to.
	 */

	if (!print_notify_pid_list(printer, send_ctx, &num_pids, &pid_list))
		return;

	if (timeout != 0) {
		end_time = timeval_current_ofs(timeout, 0);
	}

	for (i = 0; i < num_pids; i++) {
		messaging_send_buf(msg_ctx,
				   pid_to_procid(pid_list[i]),
				   MSG_PRINTER_NOTIFY2 | MSG_FLAG_LOWPRIORITY,
				   (uint8 *)buf, offset);

		if ((timeout != 0) && timeval_expired(&end_time)) {
			break;
		}
	}
}

/*******************************************************************
 Actually send the batched messages.
*******************************************************************/

void print_notify_send_messages(struct messaging_context *msg_ctx,
				unsigned int timeout)
{
	if (!print_notify_messages_pending())
		return;

	if (!create_send_ctx())
		return;

	while (print_notify_messages_pending())
		print_notify_send_messages_to_printer(
			msg_ctx, notify_queue_head->msg->printer, timeout);

	talloc_free_children(send_ctx);
	num_messages = 0;
}

/*******************************************************************
 Event handler to send the messages.
*******************************************************************/

static void print_notify_event_send_messages(struct tevent_context *event_ctx,
					     struct tevent_timer *te,
					     struct timeval now,
					     void *private_data)
{
	struct messaging_context *msg_ctx = talloc_get_type_abort(
		private_data, struct messaging_context);
	/* Remove this timed event handler. */
	TALLOC_FREE(notify_event);

	change_to_root_user();
	print_notify_send_messages(msg_ctx, 0);
}

/**********************************************************************
 deep copy a SPOOLSS_NOTIFY_MSG structure using a TALLOC_CTX
 *********************************************************************/
 
static bool copy_notify2_msg( SPOOLSS_NOTIFY_MSG *to, SPOOLSS_NOTIFY_MSG *from )
{

	if ( !to || !from )
		return False;
	
	memcpy( to, from, sizeof(SPOOLSS_NOTIFY_MSG) );
	
	if ( from->len ) {
		to->notify.data = (char *)talloc_memdup(send_ctx, from->notify.data, from->len );
		if ( !to->notify.data ) {
			DEBUG(0,("copy_notify2_msg: talloc_memdup() of size [%d] failed!\n", from->len ));
			return False;
		}
	}
	

	return True;
}

/*******************************************************************
 Batch up print notify messages.
*******************************************************************/

static void send_spoolss_notify2_msg(struct tevent_context *ev,
				     struct messaging_context *msg_ctx,
				     SPOOLSS_NOTIFY_MSG *msg)
{
	struct notify_queue *pnqueue, *tmp_ptr;

	/*
	 * Ensure we only have one job total_bytes and job total_pages for
	 * each job. There is no point in sending multiple messages that match
	 * as they will just cause flickering updates in the client.
	 */

	if ((num_messages < 100) && (msg->type == JOB_NOTIFY_TYPE) 
		&& (msg->field == JOB_NOTIFY_FIELD_TOTAL_BYTES
		    || msg->field == JOB_NOTIFY_FIELD_TOTAL_PAGES ))
	{

		for (tmp_ptr = notify_queue_head; tmp_ptr; tmp_ptr = tmp_ptr->next) 
		{
			if (tmp_ptr->msg->type == msg->type &&
					tmp_ptr->msg->field == msg->field &&
					tmp_ptr->msg->id == msg->id &&
					tmp_ptr->msg->flags == msg->flags &&
					strequal(tmp_ptr->msg->printer, msg->printer)) {

				DEBUG(5,("send_spoolss_notify2_msg: replacing message 0x%02x/0x%02x for "
					 "printer %s in notify_queue\n", msg->type, msg->field, msg->printer));

				tmp_ptr->msg = msg;
				return;
			}
		}
	}

	/* Store the message on the pending queue. */

	pnqueue = talloc(send_ctx, struct notify_queue);
	if (!pnqueue) {
		DEBUG(0,("send_spoolss_notify2_msg: Out of memory.\n"));
		return;
	}

	/* allocate a new msg structure and copy the fields */
	
	if ( !(pnqueue->msg = talloc(send_ctx, SPOOLSS_NOTIFY_MSG)) ) {
		DEBUG(0,("send_spoolss_notify2_msg: talloc() of size [%lu] failed!\n", 
			(unsigned long)sizeof(SPOOLSS_NOTIFY_MSG)));
		return;
	}
	copy_notify2_msg(pnqueue->msg, msg);
	GetTimeOfDay(&pnqueue->tv);
	pnqueue->buf = NULL;
	pnqueue->buflen = 0;

	DEBUG(5, ("send_spoolss_notify2_msg: appending message 0x%02x/0x%02x for printer %s \
to notify_queue_head\n", msg->type, msg->field, msg->printer));

	/*
	 * Note we add to the end of the list to ensure
	 * the messages are sent in the order they were received. JRA.
	 */

	DLIST_ADD_END(notify_queue_head, pnqueue, struct notify_queue *);
	num_messages++;

	if ((notify_event == NULL) && (ev != NULL)) {
		/* Add an event for 1 second's time to send this queue. */
		notify_event = tevent_add_timer(
			ev, NULL, timeval_current_ofs(1,0),
			print_notify_event_send_messages, msg_ctx);
	}

}

static void send_notify_field_values(struct tevent_context *ev,
				     struct messaging_context *msg_ctx,
				     const char *sharename, uint32 type,
				     uint32 field, uint32 id, uint32 value1, 
				     uint32 value2, uint32 flags)
{
	struct spoolss_notify_msg *msg;

	if (lp_disable_spoolss())
		return;

	if (!create_send_ctx())
		return;

	msg = talloc(send_ctx, struct spoolss_notify_msg);
	if (!msg)
		return;

	ZERO_STRUCTP(msg);

	fstrcpy(msg->printer, sharename);
	msg->type = type;
	msg->field = field;
	msg->id = id;
	msg->notify.value[0] = value1;
	msg->notify.value[1] = value2;
	msg->flags = flags;

	send_spoolss_notify2_msg(ev, msg_ctx, msg);
}

static void send_notify_field_buffer(struct tevent_context *ev,
				     struct messaging_context *msg_ctx,
				     const char *sharename, uint32 type,
				     uint32 field, uint32 id, uint32 len,
				     const char *buffer)
{
	struct spoolss_notify_msg *msg;

	if (lp_disable_spoolss())
		return;

	if (!create_send_ctx())
		return;

	msg = talloc(send_ctx, struct spoolss_notify_msg);
	if (!msg)
		return;

	ZERO_STRUCTP(msg);

	fstrcpy(msg->printer, sharename);
	msg->type = type;
	msg->field = field;
	msg->id = id;
	msg->len = len;
	msg->notify.data = discard_const_p(char, buffer);

	send_spoolss_notify2_msg(ev, msg_ctx, msg);
}

/* Send a message that the printer status has changed */

void notify_printer_status_byname(struct tevent_context *ev,
				  struct messaging_context *msg_ctx,
				  const char *sharename, uint32 status)
{
	/* Printer status stored in value1 */

	int snum = print_queue_snum(sharename);

	send_notify_field_values(ev, msg_ctx, sharename, PRINTER_NOTIFY_TYPE,
				 PRINTER_NOTIFY_FIELD_STATUS, snum,
				 status, 0, 0);
}

void notify_printer_status(struct tevent_context *ev,
			   struct messaging_context *msg_ctx,
			   int snum, uint32 status)
{
	const char *sharename = lp_servicename(talloc_tos(), snum);

	if (sharename)
		notify_printer_status_byname(ev, msg_ctx, sharename, status);
}

void notify_job_status_byname(struct tevent_context *ev,
			      struct messaging_context *msg_ctx,
			      const char *sharename, uint32 jobid,
			      uint32 status,
			      uint32 flags)
{
	/* Job id stored in id field, status in value1 */

	send_notify_field_values(ev, msg_ctx,
				 sharename, JOB_NOTIFY_TYPE,
				 JOB_NOTIFY_FIELD_STATUS, jobid,
				 status, 0, flags);
}

void notify_job_status(struct tevent_context *ev,
		       struct messaging_context *msg_ctx,
		       const char *sharename, uint32 jobid, uint32 status)
{
	notify_job_status_byname(ev, msg_ctx, sharename, jobid, status, 0);
}

void notify_job_total_bytes(struct tevent_context *ev,
			    struct messaging_context *msg_ctx,
			    const char *sharename, uint32 jobid,
			    uint32 size)
{
	/* Job id stored in id field, status in value1 */

	send_notify_field_values(ev, msg_ctx,
				 sharename, JOB_NOTIFY_TYPE,
				 JOB_NOTIFY_FIELD_TOTAL_BYTES, jobid,
				 size, 0, 0);
}

void notify_job_total_pages(struct tevent_context *ev,
			    struct messaging_context *msg_ctx,
			    const char *sharename, uint32 jobid,
			    uint32 pages)
{
	/* Job id stored in id field, status in value1 */

	send_notify_field_values(ev, msg_ctx,
				 sharename, JOB_NOTIFY_TYPE,
				 JOB_NOTIFY_FIELD_TOTAL_PAGES, jobid,
				 pages, 0, 0);
}

void notify_job_username(struct tevent_context *ev,
			 struct messaging_context *msg_ctx,
			 const char *sharename, uint32 jobid, char *name)
{
	send_notify_field_buffer(
		ev, msg_ctx,
		sharename, JOB_NOTIFY_TYPE, JOB_NOTIFY_FIELD_USER_NAME,
		jobid, strlen(name) + 1, name);
}

void notify_job_name(struct tevent_context *ev,
		     struct messaging_context *msg_ctx,
		     const char *sharename, uint32 jobid, char *name)
{
	send_notify_field_buffer(
		ev, msg_ctx,
		sharename, JOB_NOTIFY_TYPE, JOB_NOTIFY_FIELD_DOCUMENT,
		jobid, strlen(name) + 1, name);
}

void notify_job_submitted(struct tevent_context *ev,
			  struct messaging_context *msg_ctx,
			  const char *sharename, uint32 jobid,
			  time_t submitted)
{
	send_notify_field_buffer(
		ev, msg_ctx,
		sharename, JOB_NOTIFY_TYPE, JOB_NOTIFY_FIELD_SUBMITTED,
		jobid, sizeof(submitted), (char *)&submitted);
}

void notify_printer_driver(struct tevent_context *ev,
			   struct messaging_context *msg_ctx,
			   int snum, const char *driver_name)
{
	const char *sharename = lp_servicename(talloc_tos(), snum);

	send_notify_field_buffer(
		ev, msg_ctx,
		sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_FIELD_DRIVER_NAME,
		snum, strlen(driver_name) + 1, driver_name);
}

void notify_printer_comment(struct tevent_context *ev,
			    struct messaging_context *msg_ctx,
			    int snum, const char *comment)
{
	const char *sharename = lp_servicename(talloc_tos(), snum);

	send_notify_field_buffer(
		ev, msg_ctx,
		sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_FIELD_COMMENT,
		snum, strlen(comment) + 1, comment);
}

void notify_printer_sharename(struct tevent_context *ev,
			      struct messaging_context *msg_ctx,
			      int snum, const char *share_name)
{
	const char *sharename = lp_servicename(talloc_tos(), snum);

	send_notify_field_buffer(
		ev, msg_ctx,
		sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_FIELD_SHARE_NAME,
		snum, strlen(share_name) + 1, share_name);
}

void notify_printer_printername(struct tevent_context *ev,
				struct messaging_context *msg_ctx,
				int snum, const char *printername)
{
	const char *sharename = lp_servicename(talloc_tos(), snum);

	send_notify_field_buffer(
		ev, msg_ctx,
		sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_FIELD_PRINTER_NAME,
		snum, strlen(printername) + 1, printername);
}

void notify_printer_port(struct tevent_context *ev,
			 struct messaging_context *msg_ctx,
			 int snum, const char *port_name)
{
	const char *sharename = lp_servicename(talloc_tos(), snum);

	send_notify_field_buffer(
		ev, msg_ctx,
		sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_FIELD_PORT_NAME,
		snum, strlen(port_name) + 1, port_name);
}

void notify_printer_location(struct tevent_context *ev,
			     struct messaging_context *msg_ctx,
			     int snum, const char *location)
{
	const char *sharename = lp_servicename(talloc_tos(), snum);

	send_notify_field_buffer(
		ev, msg_ctx,
		sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_FIELD_LOCATION,
		snum, strlen(location) + 1, location);
}

void notify_printer_sepfile(struct tevent_context *ev,
			    struct messaging_context *msg_ctx,
			    int snum, const char *sepfile)
{
	const char *sharename = lp_servicename(talloc_tos(), snum);

	send_notify_field_buffer(
		ev, msg_ctx,
		sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_FIELD_SEPFILE,
		snum, strlen(sepfile) + 1, sepfile);
}


void notify_printer_byname(struct tevent_context *ev,
			   struct messaging_context *msg_ctx,
			   const char *printername, uint32 change,
			   const char *value)
{
	int snum = print_queue_snum(printername);
	int type = PRINTER_NOTIFY_TYPE;
	
	if ( snum == -1 )
		return;
		
	send_notify_field_buffer(
		ev, msg_ctx,
		printername, type, change, snum, strlen(value)+1, value );
} 


/****************************************************************************
 Return a malloced list of pid_t's that are interested in getting update
 messages on this print queue. Used in printing/notify to send the messages.
****************************************************************************/

static bool print_notify_pid_list(const char *printername, TALLOC_CTX *mem_ctx,
				  size_t *p_num_pids, pid_t **pp_pid_list)
{
	struct tdb_print_db *pdb = NULL;
	TDB_CONTEXT *tdb = NULL;
	TDB_DATA data;
	bool ret = True;
	size_t i, num_pids, offset;
	pid_t *pid_list;

	*p_num_pids = 0;
	*pp_pid_list = NULL;

	pdb = get_print_db_byname(printername);
	if (!pdb)
		return False;
	tdb = pdb->tdb;

	if (tdb_read_lock_bystring_with_timeout(tdb, NOTIFY_PID_LIST_KEY, 10) != 0) {
		DEBUG(0,("print_notify_pid_list: Failed to lock printer %s database\n",
					printername));
		if (pdb)
			release_print_db(pdb);
		return False;
	}

	data = get_printer_notify_pid_list( tdb, printername, True );

	if (!data.dptr) {
		ret = True;
		goto done;
	}

	num_pids = data.dsize / 8;

	if (num_pids) {
		if ((pid_list = talloc_array(mem_ctx, pid_t, num_pids)) == NULL) {
			ret = False;
			goto done;
		}
	} else {
		pid_list = NULL;
	}

	for( i = 0, offset = 0; i < num_pids; offset += 8, i++)
		pid_list[i] = (pid_t)IVAL(data.dptr, offset);

	*pp_pid_list = pid_list;
	*p_num_pids = num_pids;

	ret = True;

  done:

	tdb_read_unlock_bystring(tdb, NOTIFY_PID_LIST_KEY);
	if (pdb)
		release_print_db(pdb);
	SAFE_FREE(data.dptr);
	return ret;
}