source: branches/samba-3.5.x/source3/printing/notify.c@ 743

Last change on this file since 743 was 414, checked in by Herwig Bauernfeind, 15 years ago

Samba 3.5.0: Initial import
File size: 15.3 KB
Line 
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
25static TALLOC_CTX *send_ctx;
26
27static unsigned int num_messages;
28
29static struct notify_queue {
30 struct notify_queue *next, *prev;
31 struct spoolss_notify_msg *msg;
32 struct timeval tv;
33 uint8 *buf;
34 size_t buflen;
35} *notify_queue_head = NULL;
36
37static struct tevent_timer *notify_event;
38
39static bool print_notify_pid_list(const char *printername, TALLOC_CTX *mem_ctx,
40 size_t *p_num_pids, pid_t **pp_pid_list);
41
42static bool create_send_ctx(void)
43{
44 if (!send_ctx)
45 send_ctx = talloc_init("print notify queue");
46
47 if (!send_ctx)
48 return False;
49
50 return True;
51}
52
53/****************************************************************************
54 Turn a queue name into a snum.
55****************************************************************************/
56
57int print_queue_snum(const char *qname)
58{
59 int snum = lp_servicenumber(qname);
60 if (snum == -1 || !lp_print_ok(snum))
61 return -1;
62 return snum;
63}
64
65/*******************************************************************
66 Used to decide if we need a short select timeout.
67*******************************************************************/
68
69static bool print_notify_messages_pending(void)
70{
71 return (notify_queue_head != NULL);
72}
73
74/*******************************************************************
75 Flatten data into a message.
76*******************************************************************/
77
78static bool flatten_message(struct notify_queue *q)
79{
80 struct spoolss_notify_msg *msg = q->msg;
81 uint8 *buf = NULL;
82 size_t buflen = 0, len;
83
84again:
85 len = 0;
86
87 /* Pack header */
88
89 len += tdb_pack(buf + len, buflen - len, "f", msg->printer);
90
91 len += tdb_pack(buf + len, buflen - len, "ddddddd",
92 (uint32)q->tv.tv_sec, (uint32)q->tv.tv_usec,
93 msg->type, msg->field, msg->id, msg->len, msg->flags);
94
95 /* Pack data */
96
97 if (msg->len == 0)
98 len += tdb_pack(buf + len, buflen - len, "dd",
99 msg->notify.value[0], msg->notify.value[1]);
100 else
101 len += tdb_pack(buf + len, buflen - len, "B",
102 msg->len, msg->notify.data);
103
104 if (buflen != len) {
105 buf = (uint8 *)TALLOC_REALLOC(send_ctx, buf, len);
106 if (!buf)
107 return False;
108 buflen = len;
109 goto again;
110 }
111
112 q->buf = buf;
113 q->buflen = buflen;
114
115 return True;
116}
117
118/*******************************************************************
119 Send the batched messages - on a per-printer basis.
120*******************************************************************/
121
122static void print_notify_send_messages_to_printer(struct messaging_context *msg_ctx,
123 const char *printer,
124 unsigned int timeout)
125{
126 char *buf;
127 struct notify_queue *pq, *pq_next;
128 size_t msg_count = 0, offset = 0;
129 size_t num_pids = 0;
130 size_t i;
131 pid_t *pid_list = NULL;
132 struct timeval end_time = timeval_zero();
133
134 /* Count the space needed to send the messages. */
135 for (pq = notify_queue_head; pq; pq = pq->next) {
136 if (strequal(printer, pq->msg->printer)) {
137 if (!flatten_message(pq)) {
138 DEBUG(0,("print_notify_send_messages: Out of memory\n"));
139 talloc_free_children(send_ctx);
140 num_messages = 0;
141 return;
142 }
143 offset += (pq->buflen + 4);
144 msg_count++;
145 }
146 }
147 offset += 4; /* For count. */
148
149 buf = (char *)TALLOC(send_ctx, offset);
150 if (!buf) {
151 DEBUG(0,("print_notify_send_messages: Out of memory\n"));
152 talloc_free_children(send_ctx);
153 num_messages = 0;
154 return;
155 }
156
157 offset = 0;
158 SIVAL(buf,offset,msg_count);
159 offset += 4;
160 for (pq = notify_queue_head; pq; pq = pq_next) {
161 pq_next = pq->next;
162
163 if (strequal(printer, pq->msg->printer)) {
164 SIVAL(buf,offset,pq->buflen);
165 offset += 4;
166 memcpy(buf + offset, pq->buf, pq->buflen);
167 offset += pq->buflen;
168
169 /* Remove from list. */
170 DLIST_REMOVE(notify_queue_head, pq);
171 }
172 }
173
174 DEBUG(5, ("print_notify_send_messages_to_printer: sending %lu print notify message%s to printer %s\n",
175 (unsigned long)msg_count, msg_count != 1 ? "s" : "", printer));
176
177 /*
178 * Get the list of PID's to send to.
179 */
180
181 if (!print_notify_pid_list(printer, send_ctx, &num_pids, &pid_list))
182 return;
183
184 if (timeout != 0) {
185 end_time = timeval_current_ofs(timeout, 0);
186 }
187
188 for (i = 0; i < num_pids; i++) {
189 messaging_send_buf(msg_ctx,
190 pid_to_procid(pid_list[i]),
191 MSG_PRINTER_NOTIFY2 | MSG_FLAG_LOWPRIORITY,
192 (uint8 *)buf, offset);
193
194 if ((timeout != 0) && timeval_expired(&end_time)) {
195 break;
196 }
197 }
198}
199
200/*******************************************************************
201 Actually send the batched messages.
202*******************************************************************/
203
204void print_notify_send_messages(struct messaging_context *msg_ctx,
205 unsigned int timeout)
206{
207 if (!print_notify_messages_pending())
208 return;
209
210 if (!create_send_ctx())
211 return;
212
213 while (print_notify_messages_pending())
214 print_notify_send_messages_to_printer(
215 msg_ctx, notify_queue_head->msg->printer, timeout);
216
217 talloc_free_children(send_ctx);
218 num_messages = 0;
219}
220
221/*******************************************************************
222 Event handler to send the messages.
223*******************************************************************/
224
225static void print_notify_event_send_messages(struct tevent_context *event_ctx,
226 struct tevent_timer *te,
227 struct timeval now,
228 void *private_data)
229{
230 /* Remove this timed event handler. */
231 TALLOC_FREE(notify_event);
232
233 change_to_root_user();
234 print_notify_send_messages(smbd_messaging_context(), 0);
235}
236
237/**********************************************************************
238 deep copy a SPOOLSS_NOTIFY_MSG structure using a TALLOC_CTX
239 *********************************************************************/
240
241static bool copy_notify2_msg( SPOOLSS_NOTIFY_MSG *to, SPOOLSS_NOTIFY_MSG *from )
242{
243
244 if ( !to || !from )
245 return False;
246
247 memcpy( to, from, sizeof(SPOOLSS_NOTIFY_MSG) );
248
249 if ( from->len ) {
250 to->notify.data = (char *)TALLOC_MEMDUP(send_ctx, from->notify.data, from->len );
251 if ( !to->notify.data ) {
252 DEBUG(0,("copy_notify2_msg: TALLOC_MEMDUP() of size [%d] failed!\n", from->len ));
253 return False;
254 }
255 }
256
257
258 return True;
259}
260
261/*******************************************************************
262 Batch up print notify messages.
263*******************************************************************/
264
265static void send_spoolss_notify2_msg(SPOOLSS_NOTIFY_MSG *msg)
266{
267 struct notify_queue *pnqueue, *tmp_ptr;
268
269 /*
270 * Ensure we only have one job total_bytes and job total_pages for
271 * each job. There is no point in sending multiple messages that match
272 * as they will just cause flickering updates in the client.
273 */
274
275 if ((num_messages < 100) && (msg->type == JOB_NOTIFY_TYPE)
276 && (msg->field == JOB_NOTIFY_FIELD_TOTAL_BYTES
277 || msg->field == JOB_NOTIFY_FIELD_TOTAL_PAGES ))
278 {
279
280 for (tmp_ptr = notify_queue_head; tmp_ptr; tmp_ptr = tmp_ptr->next)
281 {
282 if (tmp_ptr->msg->type == msg->type &&
283 tmp_ptr->msg->field == msg->field &&
284 tmp_ptr->msg->id == msg->id &&
285 tmp_ptr->msg->flags == msg->flags &&
286 strequal(tmp_ptr->msg->printer, msg->printer)) {
287
288 DEBUG(5,("send_spoolss_notify2_msg: replacing message 0x%02x/0x%02x for "
289 "printer %s in notify_queue\n", msg->type, msg->field, msg->printer));
290
291 tmp_ptr->msg = msg;
292 return;
293 }
294 }
295 }
296
297 /* Store the message on the pending queue. */
298
299 pnqueue = TALLOC_P(send_ctx, struct notify_queue);
300 if (!pnqueue) {
301 DEBUG(0,("send_spoolss_notify2_msg: Out of memory.\n"));
302 return;
303 }
304
305 /* allocate a new msg structure and copy the fields */
306
307 if ( !(pnqueue->msg = TALLOC_P(send_ctx, SPOOLSS_NOTIFY_MSG)) ) {
308 DEBUG(0,("send_spoolss_notify2_msg: talloc() of size [%lu] failed!\n",
309 (unsigned long)sizeof(SPOOLSS_NOTIFY_MSG)));
310 return;
311 }
312 copy_notify2_msg(pnqueue->msg, msg);
313 GetTimeOfDay(&pnqueue->tv);
314 pnqueue->buf = NULL;
315 pnqueue->buflen = 0;
316
317 DEBUG(5, ("send_spoolss_notify2_msg: appending message 0x%02x/0x%02x for printer %s \
318to notify_queue_head\n", msg->type, msg->field, msg->printer));
319
320 /*
321 * Note we add to the end of the list to ensure
322 * the messages are sent in the order they were received. JRA.
323 */
324
325 DLIST_ADD_END(notify_queue_head, pnqueue, struct notify_queue *);
326 num_messages++;
327
328 if ((notify_event == NULL) && (smbd_event_context() != NULL)) {
329 /* Add an event for 1 second's time to send this queue. */
330 notify_event = tevent_add_timer(smbd_event_context(), NULL,
331 timeval_current_ofs(1,0),
332 print_notify_event_send_messages, NULL);
333 }
334
335}
336
337static void send_notify_field_values(const char *sharename, uint32 type,
338 uint32 field, uint32 id, uint32 value1,
339 uint32 value2, uint32 flags)
340{
341 struct spoolss_notify_msg *msg;
342
343 if (lp_disable_spoolss())
344 return;
345
346 if (!create_send_ctx())
347 return;
348
349 msg = TALLOC_P(send_ctx, struct spoolss_notify_msg);
350 if (!msg)
351 return;
352
353 ZERO_STRUCTP(msg);
354
355 fstrcpy(msg->printer, sharename);
356 msg->type = type;
357 msg->field = field;
358 msg->id = id;
359 msg->notify.value[0] = value1;
360 msg->notify.value[1] = value2;
361 msg->flags = flags;
362
363 send_spoolss_notify2_msg(msg);
364}
365
366static void send_notify_field_buffer(const char *sharename, uint32 type,
367 uint32 field, uint32 id, uint32 len,
368 const char *buffer)
369{
370 struct spoolss_notify_msg *msg;
371
372 if (lp_disable_spoolss())
373 return;
374
375 if (!create_send_ctx())
376 return;
377
378 msg = TALLOC_P(send_ctx, struct spoolss_notify_msg);
379 if (!msg)
380 return;
381
382 ZERO_STRUCTP(msg);
383
384 fstrcpy(msg->printer, sharename);
385 msg->type = type;
386 msg->field = field;
387 msg->id = id;
388 msg->len = len;
389 msg->notify.data = CONST_DISCARD(char *,buffer);
390
391 send_spoolss_notify2_msg(msg);
392}
393
394/* Send a message that the printer status has changed */
395
396void notify_printer_status_byname(const char *sharename, uint32 status)
397{
398 /* Printer status stored in value1 */
399
400 int snum = print_queue_snum(sharename);
401
402 send_notify_field_values(sharename, PRINTER_NOTIFY_TYPE,
403 PRINTER_NOTIFY_FIELD_STATUS, snum,
404 status, 0, 0);
405}
406
407void notify_printer_status(int snum, uint32 status)
408{
409 const char *sharename = SERVICE(snum);
410
411 if (sharename)
412 notify_printer_status_byname(sharename, status);
413}
414
415void notify_job_status_byname(const char *sharename, uint32 jobid, uint32 status,
416 uint32 flags)
417{
418 /* Job id stored in id field, status in value1 */
419
420 send_notify_field_values(sharename, JOB_NOTIFY_TYPE,
421 JOB_NOTIFY_FIELD_STATUS, jobid,
422 status, 0, flags);
423}
424
425void notify_job_status(const char *sharename, uint32 jobid, uint32 status)
426{
427 notify_job_status_byname(sharename, jobid, status, 0);
428}
429
430void notify_job_total_bytes(const char *sharename, uint32 jobid,
431 uint32 size)
432{
433 /* Job id stored in id field, status in value1 */
434
435 send_notify_field_values(sharename, JOB_NOTIFY_TYPE,
436 JOB_NOTIFY_FIELD_TOTAL_BYTES, jobid,
437 size, 0, 0);
438}
439
440void notify_job_total_pages(const char *sharename, uint32 jobid,
441 uint32 pages)
442{
443 /* Job id stored in id field, status in value1 */
444
445 send_notify_field_values(sharename, JOB_NOTIFY_TYPE,
446 JOB_NOTIFY_FIELD_TOTAL_PAGES, jobid,
447 pages, 0, 0);
448}
449
450void notify_job_username(const char *sharename, uint32 jobid, char *name)
451{
452 send_notify_field_buffer(
453 sharename, JOB_NOTIFY_TYPE, JOB_NOTIFY_FIELD_USER_NAME,
454 jobid, strlen(name) + 1, name);
455}
456
457void notify_job_name(const char *sharename, uint32 jobid, char *name)
458{
459 send_notify_field_buffer(
460 sharename, JOB_NOTIFY_TYPE, JOB_NOTIFY_FIELD_DOCUMENT,
461 jobid, strlen(name) + 1, name);
462}
463
464void notify_job_submitted(const char *sharename, uint32 jobid,
465 time_t submitted)
466{
467 send_notify_field_buffer(
468 sharename, JOB_NOTIFY_TYPE, JOB_NOTIFY_FIELD_SUBMITTED,
469 jobid, sizeof(submitted), (char *)&submitted);
470}
471
472void notify_printer_driver(int snum, char *driver_name)
473{
474 const char *sharename = SERVICE(snum);
475
476 send_notify_field_buffer(
477 sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_FIELD_DRIVER_NAME,
478 snum, strlen(driver_name) + 1, driver_name);
479}
480
481void notify_printer_comment(int snum, char *comment)
482{
483 const char *sharename = SERVICE(snum);
484
485 send_notify_field_buffer(
486 sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_FIELD_COMMENT,
487 snum, strlen(comment) + 1, comment);
488}
489
490void notify_printer_sharename(int snum, char *share_name)
491{
492 const char *sharename = SERVICE(snum);
493
494 send_notify_field_buffer(
495 sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_FIELD_SHARE_NAME,
496 snum, strlen(share_name) + 1, share_name);
497}
498
499void notify_printer_printername(int snum, char *printername)
500{
501 const char *sharename = SERVICE(snum);
502
503 send_notify_field_buffer(
504 sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_FIELD_PRINTER_NAME,
505 snum, strlen(printername) + 1, printername);
506}
507
508void notify_printer_port(int snum, char *port_name)
509{
510 const char *sharename = SERVICE(snum);
511
512 send_notify_field_buffer(
513 sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_FIELD_PORT_NAME,
514 snum, strlen(port_name) + 1, port_name);
515}
516
517void notify_printer_location(int snum, char *location)
518{
519 const char *sharename = SERVICE(snum);
520
521 send_notify_field_buffer(
522 sharename, PRINTER_NOTIFY_TYPE, PRINTER_NOTIFY_FIELD_LOCATION,
523 snum, strlen(location) + 1, location);
524}
525
526void notify_printer_byname( const char *printername, uint32 change, const char *value )
527{
528 int snum = print_queue_snum(printername);
529 int type = PRINTER_NOTIFY_TYPE;
530
531 if ( snum == -1 )
532 return;
533
534 send_notify_field_buffer( printername, type, change, snum, strlen(value)+1, value );
535}
536
537
538/****************************************************************************
539 Return a malloced list of pid_t's that are interested in getting update
540 messages on this print queue. Used in printing/notify to send the messages.
541****************************************************************************/
542
543static bool print_notify_pid_list(const char *printername, TALLOC_CTX *mem_ctx,
544 size_t *p_num_pids, pid_t **pp_pid_list)
545{
546 struct tdb_print_db *pdb = NULL;
547 TDB_CONTEXT *tdb = NULL;
548 TDB_DATA data;
549 bool ret = True;
550 size_t i, num_pids, offset;
551 pid_t *pid_list;
552
553 *p_num_pids = 0;
554 *pp_pid_list = NULL;
555
556 pdb = get_print_db_byname(printername);
557 if (!pdb)
558 return False;
559 tdb = pdb->tdb;
560
561 if (tdb_read_lock_bystring_with_timeout(tdb, NOTIFY_PID_LIST_KEY, 10) == -1) {
562 DEBUG(0,("print_notify_pid_list: Failed to lock printer %s database\n",
563 printername));
564 if (pdb)
565 release_print_db(pdb);
566 return False;
567 }
568
569 data = get_printer_notify_pid_list( tdb, printername, True );
570
571 if (!data.dptr) {
572 ret = True;
573 goto done;
574 }
575
576 num_pids = data.dsize / 8;
577
578 if (num_pids) {
579 if ((pid_list = TALLOC_ARRAY(mem_ctx, pid_t, num_pids)) == NULL) {
580 ret = False;
581 goto done;
582 }
583 } else {
584 pid_list = NULL;
585 }
586
587 for( i = 0, offset = 0; i < num_pids; offset += 8, i++)
588 pid_list[i] = (pid_t)IVAL(data.dptr, offset);
589
590 *pp_pid_list = pid_list;
591 *p_num_pids = num_pids;
592
593 ret = True;
594
595 done:
596
597 tdb_read_unlock_bystring(tdb, NOTIFY_PID_LIST_KEY);
598 if (pdb)
599 release_print_db(pdb);
600 SAFE_FREE(data.dptr);
601 return ret;
602}
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