1 /*
2 Unix SMB/Netbios implementation.
3 Version 3.0
4 printing backend routines
5 Copyright (C) Tim Potter, 2002
6 Copyright (C) Gerald Carter, 2002
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include "includes.h"
23 #include "printing.h"
24 #include "../librpc/gen_ndr/spoolss.h"
25 #include "nt_printing.h"
26 #include "printing/notify.h"
27 #include "messages.h"
28 #include "util_tdb.h"
29
30 static TALLOC_CTX *send_ctx;
31
32 static unsigned int num_messages;
33
34 static struct notify_queue {
35 struct notify_queue *next, *prev;
36 struct spoolss_notify_msg *msg;
37 struct timeval tv;
38 uint8_t *buf;
39 size_t buflen;
40 } *notify_queue_head = NULL;
41
42 static struct tevent_timer *notify_event;
43
44 static bool print_notify_pid_list(const char *printername, TALLOC_CTX *mem_ctx,
45 size_t *p_num_pids, pid_t **pp_pid_list);
46
create_send_ctx(void)47 static bool create_send_ctx(void)
48 {
49 if (!send_ctx)
50 send_ctx = talloc_init("print notify queue");
51
52 if (!send_ctx)
53 return False;
54
55 return True;
56 }
57
58 /****************************************************************************
59 Turn a queue name into a snum.
60 ****************************************************************************/
61
print_queue_snum(const char * qname)62 int print_queue_snum(const char *qname)
63 {
64 int snum = lp_servicenumber(qname);
65 if (snum == -1 || !lp_printable(snum))
66 return -1;
67 return snum;
68 }
69
70 /*******************************************************************
71 Used to decide if we need a short select timeout.
72 *******************************************************************/
73
print_notify_messages_pending(void)74 static bool print_notify_messages_pending(void)
75 {
76 return (notify_queue_head != NULL);
77 }
78
79 /*******************************************************************
80 Flatten data into a message.
81 *******************************************************************/
82
flatten_message(struct notify_queue * q)83 static bool flatten_message(struct notify_queue *q)
84 {
85 struct spoolss_notify_msg *msg = q->msg;
86 uint8_t *buf = NULL;
87 size_t buflen = 0, len;
88
89 again:
90 len = 0;
91
92 /* Pack header */
93
94 len += tdb_pack(buf ? buf + len : NULL,
95 buf ? buflen - len : 0, "f", msg->printer);
96
97 len += tdb_pack(buf ? buf + len : NULL,
98 buf ? buflen - len : 0, "ddddddd",
99 (uint32_t)q->tv.tv_sec, (uint32_t)q->tv.tv_usec,
100 msg->type, msg->field, msg->id, msg->len, msg->flags);
101
102 /* Pack data */
103
104 if (msg->len == 0)
105 len += tdb_pack(buf ? buf + len : NULL,
106 buf ? buflen - len : 0, "dd",
107 msg->notify.value[0], msg->notify.value[1]);
108 else
109 len += tdb_pack(buf ? buf + len : NULL,
110 buf ? buflen - len : 0, "B",
111 msg->len, msg->notify.data);
112
113 if (buflen != len) {
114 buf = (uint8_t *)TALLOC_REALLOC(send_ctx, buf, len);
115 if (!buf)
116 return False;
117 buflen = len;
118 goto again;
119 }
120
121 q->buf = buf;
122 q->buflen = buflen;
123
124 return True;
125 }
126
127 /*******************************************************************
128 Send the batched messages - on a per-printer basis.
129 *******************************************************************/
130
print_notify_send_messages_to_printer(struct messaging_context * msg_ctx,const char * printer,unsigned int timeout)131 static void print_notify_send_messages_to_printer(struct messaging_context *msg_ctx,
132 const char *printer,
133 unsigned int timeout)
134 {
135 char *buf;
136 struct notify_queue *pq, *pq_next;
137 size_t msg_count = 0, offset = 0;
138 size_t num_pids = 0;
139 size_t i;
140 pid_t *pid_list = NULL;
141 struct timeval end_time = timeval_zero();
142
143 /* Count the space needed to send the messages. */
144 for (pq = notify_queue_head; pq; pq = pq->next) {
145 if (strequal(printer, pq->msg->printer)) {
146 if (!flatten_message(pq)) {
147 DEBUG(0,("print_notify_send_messages: Out of memory\n"));
148 talloc_free_children(send_ctx);
149 num_messages = 0;
150 return;
151 }
152 offset += (pq->buflen + 4);
153 msg_count++;
154 }
155 }
156 offset += 4; /* For count. */
157
158 buf = (char *)TALLOC(send_ctx, offset);
159 if (!buf) {
160 DEBUG(0,("print_notify_send_messages: Out of memory\n"));
161 talloc_free_children(send_ctx);
162 num_messages = 0;
163 return;
164 }
165
166 offset = 0;
167 SIVAL(buf,offset,msg_count);
168 offset += 4;
169 for (pq = notify_queue_head; pq; pq = pq_next) {
170 pq_next = pq->next;
171
172 if (strequal(printer, pq->msg->printer)) {
173 SIVAL(buf,offset,pq->buflen);
174 offset += 4;
175 memcpy(buf + offset, pq->buf, pq->buflen);
176 offset += pq->buflen;
177
178 /* Remove from list. */
179 DLIST_REMOVE(notify_queue_head, pq);
180 }
181 }
182
183 DEBUG(5, ("print_notify_send_messages_to_printer: sending %lu print notify message%s to printer %s\n",
184 (unsigned long)msg_count, msg_count != 1 ? "s" : "", printer));
185
186 /*
187 * Get the list of PID's to send to.
188 */
189
190 if (!print_notify_pid_list(printer, send_ctx, &num_pids, &pid_list))
191 return;
192
193 if (timeout != 0) {
194 end_time = timeval_current_ofs(timeout, 0);
195 }
196
197 for (i = 0; i < num_pids; i++) {
198 messaging_send_buf(msg_ctx,
199 pid_to_procid(pid_list[i]),
200 MSG_PRINTER_NOTIFY2 | MSG_FLAG_LOWPRIORITY,
201 (uint8_t *)buf, offset);
202
203 if ((timeout != 0) && timeval_expired(&end_time)) {
204 break;
205 }
206 }
207 }
208
209 /*******************************************************************
210 Actually send the batched messages.
211 *******************************************************************/
212
print_notify_send_messages(struct messaging_context * msg_ctx,unsigned int timeout)213 void print_notify_send_messages(struct messaging_context *msg_ctx,
214 unsigned int timeout)
215 {
216 if (!print_notify_messages_pending())
217 return;
218
219 if (!create_send_ctx())
220 return;
221
222 while (print_notify_messages_pending())
223 print_notify_send_messages_to_printer(
224 msg_ctx, notify_queue_head->msg->printer, timeout);
225
226 talloc_free_children(send_ctx);
227 num_messages = 0;
228 }
229
230 /*******************************************************************
231 Event handler to send the messages.
232 *******************************************************************/
233
print_notify_event_send_messages(struct tevent_context * event_ctx,struct tevent_timer * te,struct timeval now,void * private_data)234 static void print_notify_event_send_messages(struct tevent_context *event_ctx,
235 struct tevent_timer *te,
236 struct timeval now,
237 void *private_data)
238 {
239 struct messaging_context *msg_ctx = talloc_get_type_abort(
240 private_data, struct messaging_context);
241 /* Remove this timed event handler. */
242 TALLOC_FREE(notify_event);
243
244 change_to_root_user();
245 print_notify_send_messages(msg_ctx, 0);
246 }
247
248 /**********************************************************************
249 deep copy a SPOOLSS_NOTIFY_MSG structure using a TALLOC_CTX
250 *********************************************************************/
251
copy_notify2_msg(SPOOLSS_NOTIFY_MSG * to,SPOOLSS_NOTIFY_MSG * from)252 static bool copy_notify2_msg( SPOOLSS_NOTIFY_MSG *to, SPOOLSS_NOTIFY_MSG *from )
253 {
254
255 if ( !to || !from )
256 return False;
257
258 memcpy( to, from, sizeof(SPOOLSS_NOTIFY_MSG) );
259
260 if ( from->len ) {
261 to->notify.data = (char *)talloc_memdup(send_ctx, from->notify.data, from->len );
262 if ( !to->notify.data ) {
263 DEBUG(0,("copy_notify2_msg: talloc_memdup() of size [%d] failed!\n", from->len ));
264 return False;
265 }
266 }
267
268
269 return True;
270 }
271
272 /*******************************************************************
273 Batch up print notify messages.
274 *******************************************************************/
275
send_spoolss_notify2_msg(struct tevent_context * ev,struct messaging_context * msg_ctx,SPOOLSS_NOTIFY_MSG * msg)276 static void send_spoolss_notify2_msg(struct tevent_context *ev,
277 struct messaging_context *msg_ctx,
278 SPOOLSS_NOTIFY_MSG *msg)
279 {
280 struct notify_queue *pnqueue, *tmp_ptr;
281
282 /*
283 * Ensure we only have one job total_bytes and job total_pages for
284 * each job. There is no point in sending multiple messages that match
285 * as they will just cause flickering updates in the client.
286 */
287
288 if ((num_messages < 100) && (msg->type == JOB_NOTIFY_TYPE)
289 && (msg->field == JOB_NOTIFY_FIELD_TOTAL_BYTES
290 || msg->field == JOB_NOTIFY_FIELD_TOTAL_PAGES ))
291 {
292
293 for (tmp_ptr = notify_queue_head; tmp_ptr; tmp_ptr = tmp_ptr->next)
294 {
295 if (tmp_ptr->msg->type == msg->type &&
296 tmp_ptr->msg->field == msg->field &&
297 tmp_ptr->msg->id == msg->id &&
298 tmp_ptr->msg->flags == msg->flags &&
299 strequal(tmp_ptr->msg->printer, msg->printer)) {
300
301 DEBUG(5,("send_spoolss_notify2_msg: replacing message 0x%02x/0x%02x for "
302 "printer %s in notify_queue\n", msg->type, msg->field, msg->printer));
303
304 tmp_ptr->msg = msg;
305 return;
306 }
307 }
308 }
309
310 /* Store the message on the pending queue. */
311
312 pnqueue = talloc(send_ctx, struct notify_queue);
313 if (!pnqueue) {
314 DEBUG(0,("send_spoolss_notify2_msg: Out of memory.\n"));
315 return;
316 }
317
318 /* allocate a new msg structure and copy the fields */
319
320 if ( !(pnqueue->msg = talloc(send_ctx, SPOOLSS_NOTIFY_MSG)) ) {
321 DEBUG(0,("send_spoolss_notify2_msg: talloc() of size [%lu] failed!\n",
322 (unsigned long)sizeof(SPOOLSS_NOTIFY_MSG)));
323 return;
324 }
325 copy_notify2_msg(pnqueue->msg, msg);
326 GetTimeOfDay(&pnqueue->tv);
327 pnqueue->buf = NULL;
328 pnqueue->buflen = 0;
329
330 DEBUG(5, ("send_spoolss_notify2_msg: appending message 0x%02x/0x%02x for printer %s \
331 to notify_queue_head\n", msg->type, msg->field, msg->printer));
332
333 /*
334 * Note we add to the end of the list to ensure
335 * the messages are sent in the order they were received. JRA.
336 */
337
338 DLIST_ADD_END(notify_queue_head, pnqueue);
339 num_messages++;
340
341 if ((notify_event == NULL) && (ev != NULL)) {
342 /* Add an event for 1 second's time to send this queue. */
343 notify_event = tevent_add_timer(
344 ev, NULL, timeval_current_ofs(1,0),
345 print_notify_event_send_messages, msg_ctx);
346 }
347
348 }
349
send_notify_field_values(struct tevent_context * ev,struct messaging_context * msg_ctx,const char * sharename,uint32_t type,uint32_t field,uint32_t id,uint32_t value1,uint32_t value2,uint32_t flags)350 static void send_notify_field_values(struct tevent_context *ev,
351 struct messaging_context *msg_ctx,
352 const char *sharename, uint32_t type,
353 uint32_t field, uint32_t id, uint32_t value1,
354 uint32_t value2, uint32_t flags)
355 {
356 struct spoolss_notify_msg *msg;
357
358 if (lp_disable_spoolss())
359 return;
360
361 if (!create_send_ctx())
362 return;
363
364 msg = talloc_zero(send_ctx, struct spoolss_notify_msg);
365 if (!msg)
366 return;
367
368 fstrcpy(msg->printer, sharename);
369 msg->type = type;
370 msg->field = field;
371 msg->id = id;
372 msg->notify.value[0] = value1;
373 msg->notify.value[1] = value2;
374 msg->flags = flags;
375
376 send_spoolss_notify2_msg(ev, msg_ctx, msg);
377 }
378
send_notify_field_buffer(struct tevent_context * ev,struct messaging_context * msg_ctx,const char * sharename,uint32_t type,uint32_t field,uint32_t id,uint32_t len,const char * buffer)379 static void send_notify_field_buffer(struct tevent_context *ev,
380 struct messaging_context *msg_ctx,
381 const char *sharename, uint32_t type,
382 uint32_t field, uint32_t id, uint32_t len,
383 const char *buffer)
384 {
385 struct spoolss_notify_msg *msg;
386
387 if (lp_disable_spoolss())
388 return;
389
390 if (!create_send_ctx())
391 return;
392
393 msg = talloc_zero(send_ctx, struct spoolss_notify_msg);
394 if (!msg)
395 return;
396
397 fstrcpy(msg->printer, sharename);
398 msg->type = type;
399 msg->field = field;
400 msg->id = id;
401 msg->len = len;
402 msg->notify.data = discard_const_p(char, buffer);
403
404 send_spoolss_notify2_msg(ev, msg_ctx, msg);
405 }
406
407 /* Send a message that the printer status has changed */
408
notify_printer_status_byname(struct tevent_context * ev,struct messaging_context * msg_ctx,const char * sharename,uint32_t status)409 void notify_printer_status_byname(struct tevent_context *ev,
410 struct messaging_context *msg_ctx,
411 const char *sharename, uint32_t status)
412 {
413 /* Printer status stored in value1 */
414
415 int snum = print_queue_snum(sharename);
416
417 send_notify_field_values(ev, msg_ctx, sharename, PRINTER_NOTIFY_TYPE,
418 PRINTER_NOTIFY_FIELD_STATUS, snum,
419 status, 0, 0);
420 }
421
notify_printer_status(struct tevent_context * ev,struct messaging_context * msg_ctx,int snum,uint32_t status)422 void notify_printer_status(struct tevent_context *ev,
423 struct messaging_context *msg_ctx,
424 int snum, uint32_t status)
425 {
426 const struct loadparm_substitution *lp_sub =
427 loadparm_s3_global_substitution();
428 const char *sharename = lp_servicename(talloc_tos(), lp_sub, snum);
429
430 if (sharename)
431 notify_printer_status_byname(ev, msg_ctx, sharename, status);
432 }
433
notify_job_status_byname(struct tevent_context * ev,struct messaging_context * msg_ctx,const char * sharename,uint32_t jobid,uint32_t status,uint32_t flags)434 void notify_job_status_byname(struct tevent_context *ev,
435 struct messaging_context *msg_ctx,
436 const char *sharename, uint32_t jobid,
437 uint32_t status,
438 uint32_t flags)
439 {
440 /* Job id stored in id field, status in value1 */
441
442 send_notify_field_values(ev, msg_ctx,
443 sharename, JOB_NOTIFY_TYPE,
444 JOB_NOTIFY_FIELD_STATUS, jobid,
445 status, 0, flags);
446 }
447
notify_job_status(struct tevent_context * ev,struct messaging_context * msg_ctx,const char * sharename,uint32_t jobid,uint32_t status)448 void notify_job_status(struct tevent_context *ev,
449 struct messaging_context *msg_ctx,
450 const char *sharename, uint32_t jobid, uint32_t status)
451 {
452 notify_job_status_byname(ev, msg_ctx, sharename, jobid, status, 0);
453 }
454
notify_job_total_bytes(struct tevent_context * ev,struct messaging_context * msg_ctx,const char * sharename,uint32_t jobid,uint32_t size)455 void notify_job_total_bytes(struct tevent_context *ev,
456 struct messaging_context *msg_ctx,
457 const char *sharename, uint32_t jobid,
458 uint32_t size)
459 {
460 /* Job id stored in id field, status in value1 */
461
462 send_notify_field_values(ev, msg_ctx,
463 sharename, JOB_NOTIFY_TYPE,
464 JOB_NOTIFY_FIELD_TOTAL_BYTES, jobid,
465 size, 0, 0);
466 }
467
notify_job_total_pages(struct tevent_context * ev,struct messaging_context * msg_ctx,const char * sharename,uint32_t jobid,uint32_t pages)468 void notify_job_total_pages(struct tevent_context *ev,
469 struct messaging_context *msg_ctx,
470 const char *sharename, uint32_t jobid,
471 uint32_t pages)
472 {
473 /* Job id stored in id field, status in value1 */
474
475 send_notify_field_values(ev, msg_ctx,
476 sharename, JOB_NOTIFY_TYPE,
477 JOB_NOTIFY_FIELD_TOTAL_PAGES, jobid,
478 pages, 0, 0);
479 }
480
notify_job_username(struct tevent_context * ev,struct messaging_context * msg_ctx,const char * sharename,uint32_t jobid,char * name)481 void notify_job_username(struct tevent_context *ev,
482 struct messaging_context *msg_ctx,
483 const char *sharename, uint32_t jobid, char *name)
484 {
485 send_notify_field_buffer(
486 ev, msg_ctx,
487 sharename, JOB_NOTIFY_TYPE, JOB_NOTIFY_FIELD_USER_NAME,
488 jobid, strlen(name) + 1, name);
489 }
490
notify_job_name(struct tevent_context * ev,struct messaging_context * msg_ctx,const char * sharename,uint32_t jobid,char * name)491 void notify_job_name(struct tevent_context *ev,
492 struct messaging_context *msg_ctx,
493 const char *sharename, uint32_t jobid, char *name)
494 {
495 send_notify_field_buffer(
496 ev, msg_ctx,
497 sharename, JOB_NOTIFY_TYPE, JOB_NOTIFY_FIELD_DOCUMENT,
498 jobid, strlen(name) + 1, name);
499 }
500
notify_job_submitted(struct tevent_context * ev,struct messaging_context * msg_ctx,const char * sharename,uint32_t jobid,time_t submitted)501 void notify_job_submitted(struct tevent_context *ev,
502 struct messaging_context *msg_ctx,
503 const char *sharename, uint32_t jobid,
504 time_t submitted)
505 {
506 send_notify_field_buffer(
507 ev, msg_ctx,
508 sharename, JOB_NOTIFY_TYPE, JOB_NOTIFY_FIELD_SUBMITTED,
509 jobid, sizeof(submitted), (char *)&submitted);
510 }
511
notify_printer_driver(struct tevent_context * ev,struct messaging_context * msg_ctx,int snum,const char * driver_name)512 void notify_printer_driver(struct tevent_context *ev,
513 struct messaging_context *msg_ctx,
514 int snum, const char *driver_name)
515 {
516 const struct loadparm_substitution *lp_sub =
517 loadparm_s3_global_substitution();
518 const char *sharename = lp_servicename(talloc_tos(), lp_sub, snum);
519
520 send_notify_field_buffer(
521 ev, msg_ctx,
522 sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_FIELD_DRIVER_NAME,
523 snum, strlen(driver_name) + 1, driver_name);
524 }
525
notify_printer_comment(struct tevent_context * ev,struct messaging_context * msg_ctx,int snum,const char * comment)526 void notify_printer_comment(struct tevent_context *ev,
527 struct messaging_context *msg_ctx,
528 int snum, const char *comment)
529 {
530 const struct loadparm_substitution *lp_sub =
531 loadparm_s3_global_substitution();
532 const char *sharename = lp_servicename(talloc_tos(), lp_sub, snum);
533
534 send_notify_field_buffer(
535 ev, msg_ctx,
536 sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_FIELD_COMMENT,
537 snum, strlen(comment) + 1, comment);
538 }
539
notify_printer_sharename(struct tevent_context * ev,struct messaging_context * msg_ctx,int snum,const char * share_name)540 void notify_printer_sharename(struct tevent_context *ev,
541 struct messaging_context *msg_ctx,
542 int snum, const char *share_name)
543 {
544 const struct loadparm_substitution *lp_sub =
545 loadparm_s3_global_substitution();
546 const char *sharename = lp_servicename(talloc_tos(), lp_sub, snum);
547
548 send_notify_field_buffer(
549 ev, msg_ctx,
550 sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_FIELD_SHARE_NAME,
551 snum, strlen(share_name) + 1, share_name);
552 }
553
notify_printer_printername(struct tevent_context * ev,struct messaging_context * msg_ctx,int snum,const char * printername)554 void notify_printer_printername(struct tevent_context *ev,
555 struct messaging_context *msg_ctx,
556 int snum, const char *printername)
557 {
558 const struct loadparm_substitution *lp_sub =
559 loadparm_s3_global_substitution();
560 const char *sharename = lp_servicename(talloc_tos(), lp_sub, snum);
561
562 send_notify_field_buffer(
563 ev, msg_ctx,
564 sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_FIELD_PRINTER_NAME,
565 snum, strlen(printername) + 1, printername);
566 }
567
notify_printer_port(struct tevent_context * ev,struct messaging_context * msg_ctx,int snum,const char * port_name)568 void notify_printer_port(struct tevent_context *ev,
569 struct messaging_context *msg_ctx,
570 int snum, const char *port_name)
571 {
572 const struct loadparm_substitution *lp_sub =
573 loadparm_s3_global_substitution();
574 const char *sharename = lp_servicename(talloc_tos(), lp_sub, snum);
575
576 send_notify_field_buffer(
577 ev, msg_ctx,
578 sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_FIELD_PORT_NAME,
579 snum, strlen(port_name) + 1, port_name);
580 }
581
notify_printer_location(struct tevent_context * ev,struct messaging_context * msg_ctx,int snum,const char * location)582 void notify_printer_location(struct tevent_context *ev,
583 struct messaging_context *msg_ctx,
584 int snum, const char *location)
585 {
586 const struct loadparm_substitution *lp_sub =
587 loadparm_s3_global_substitution();
588 const char *sharename = lp_servicename(talloc_tos(), lp_sub, snum);
589
590 send_notify_field_buffer(
591 ev, msg_ctx,
592 sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_FIELD_LOCATION,
593 snum, strlen(location) + 1, location);
594 }
595
notify_printer_sepfile(struct tevent_context * ev,struct messaging_context * msg_ctx,int snum,const char * sepfile)596 void notify_printer_sepfile(struct tevent_context *ev,
597 struct messaging_context *msg_ctx,
598 int snum, const char *sepfile)
599 {
600 const struct loadparm_substitution *lp_sub =
601 loadparm_s3_global_substitution();
602 const char *sharename = lp_servicename(talloc_tos(), lp_sub, snum);
603
604 send_notify_field_buffer(
605 ev, msg_ctx,
606 sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_FIELD_SEPFILE,
607 snum, strlen(sepfile) + 1, sepfile);
608 }
609
610
notify_printer_byname(struct tevent_context * ev,struct messaging_context * msg_ctx,const char * printername,uint32_t change,const char * value)611 void notify_printer_byname(struct tevent_context *ev,
612 struct messaging_context *msg_ctx,
613 const char *printername, uint32_t change,
614 const char *value)
615 {
616 int snum = print_queue_snum(printername);
617 int type = PRINTER_NOTIFY_TYPE;
618
619 if ( snum == -1 )
620 return;
621
622 send_notify_field_buffer(
623 ev, msg_ctx,
624 printername, type, change, snum, strlen(value)+1, value );
625 }
626
627
628 /****************************************************************************
629 Return a malloced list of pid_t's that are interested in getting update
630 messages on this print queue. Used in printing/notify to send the messages.
631 ****************************************************************************/
632
print_notify_pid_list(const char * printername,TALLOC_CTX * mem_ctx,size_t * p_num_pids,pid_t ** pp_pid_list)633 static bool print_notify_pid_list(const char *printername, TALLOC_CTX *mem_ctx,
634 size_t *p_num_pids, pid_t **pp_pid_list)
635 {
636 struct tdb_print_db *pdb = NULL;
637 TDB_CONTEXT *tdb = NULL;
638 TDB_DATA data;
639 bool ret = True;
640 size_t i, num_pids, offset;
641 pid_t *pid_list;
642
643 *p_num_pids = 0;
644 *pp_pid_list = NULL;
645
646 pdb = get_print_db_byname(printername);
647 if (!pdb)
648 return False;
649 tdb = pdb->tdb;
650
651 if (tdb_read_lock_bystring_with_timeout(tdb, NOTIFY_PID_LIST_KEY, 10) != 0) {
652 DEBUG(0,("print_notify_pid_list: Failed to lock printer %s database\n",
653 printername));
654 if (pdb)
655 release_print_db(pdb);
656 return False;
657 }
658
659 data = get_printer_notify_pid_list( tdb, printername, True );
660
661 if (!data.dptr) {
662 ret = True;
663 goto done;
664 }
665
666 num_pids = data.dsize / 8;
667
668 if (num_pids) {
669 if ((pid_list = talloc_array(mem_ctx, pid_t, num_pids)) == NULL) {
670 ret = False;
671 goto done;
672 }
673 } else {
674 pid_list = NULL;
675 }
676
677 for( i = 0, offset = 0; i < num_pids; offset += 8, i++)
678 pid_list[i] = (pid_t)IVAL(data.dptr, offset);
679
680 *pp_pid_list = pid_list;
681 *p_num_pids = num_pids;
682
683 ret = True;
684
685 done:
686
687 tdb_read_unlock_bystring(tdb, NOTIFY_PID_LIST_KEY);
688 if (pdb)
689 release_print_db(pdb);
690 SAFE_FREE(data.dptr);
691 return ret;
692 }
693