summaryrefslogtreecommitdiff
path: root/notifier/dbus.c
blob: 62a6aaffc5538d380473d3f369e0aeae5c7cabdb (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
/*
 * "$Id$"
 *
 *   D-Bus notifier for CUPS.
 *
 *   Copyright 2008-2010 by Apple Inc.
 *   Copyright (C) 2007 Red Hat, Inc.
 *   Copyright (C) 2007 Tim Waugh <twaugh@redhat.com>
 *   Copyright 1997-2005 by Easy Software Products.
 *
 *   These coded instructions, statements, and computer programs are the
 *   property of Apple Inc. and are protected by Federal copyright
 *   law.  Distribution and use rights are outlined in the file "LICENSE.txt"
 *   which should have been included with this file.  If this file is
 *   file is missing or damaged, see the license at "http://www.cups.org/".
 *
 * Contents:
 *
 *   main()         - Read events and send DBUS notifications.
 *   acquire_lock() - Acquire a lock so we only have a single notifier running.
 */

/*
 * Include necessary headers...
 */

#include <cups/cups.h>
#include <cups/string-private.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

#include <dbus/dbus.h>
#ifdef HAVE_DBUS_MESSAGE_ITER_INIT_APPEND
#  define dbus_message_append_iter_init dbus_message_iter_init_append
#  define dbus_message_iter_append_string(i,v) dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, v)
#  define dbus_message_iter_append_uint32(i,v) dbus_message_iter_append_basic(i, DBUS_TYPE_UINT32, v)
#  define dbus_message_iter_append_boolean(i,v) dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, v)
#endif /* HAVE_DBUS_MESSAGE_ITER_INIT_APPEND */


/*
 * D-Bus object: org.cups.cupsd.Notifier
 * D-Bus object path: /org/cups/cupsd/Notifier
 *
 * D-Bus interface name: org.cups.cupsd.Notifier
 *
 * Signals:
 *
 * ServerRestarted(STRING text)
 * Server has restarted.
 *
 * ServerStarted(STRING text)
 * Server has started.
 *
 * ServerStopped(STRING text)
 * Server has stopped.
 *
 * ServerAudit(STRING text)
 * Security-related event.
 *
 * PrinterRestarted(STRING text,
 *                  STRING printer-uri,
 *                  STRING printer-name,
 *                  UINT32 printer-state,
 *                  STRING printer-state-reasons,
 *                  BOOLEAN printer-is-accepting-jobs)
 * Printer has restarted.
 *
 * PrinterShutdown(STRING text,
 *                 STRING printer-uri,
 *                 STRING printer-name,
 *                 UINT32 printer-state,
 *                 STRING printer-state-reasons,
 *                 BOOLEAN printer-is-accepting-jobs)
 * Printer has shutdown.
 *
 * PrinterStopped(STRING text,
 *                STRING printer-uri,
 *                STRING printer-name,
 *                UINT32 printer-state,
 *                STRING printer-state-reasons,
 *                BOOLEAN printer-is-accepting-jobs)
 * Printer has stopped.
 *
 * PrinterStateChanged(STRING text,
 *                     STRING printer-uri,
 *                     STRING printer-name,
 *                     UINT32 printer-state,
 *                     STRING printer-state-reasons,
 *                     BOOLEAN printer-is-accepting-jobs)
 * Printer state has changed.
 *
 * PrinterFinishingsChanged(STRING text,
 *                          STRING printer-uri,
 *                          STRING printer-name,
 *                          UINT32 printer-state,
 *                          STRING printer-state-reasons,
 *                          BOOLEAN printer-is-accepting-jobs)
 * Printer's finishings-supported attribute has changed.
 *
 * PrinterMediaChanged(STRING text,
 *                     STRING printer-uri,
 *                     STRING printer-name,
 *                     UINT32 printer-state,
 *                     STRING printer-state-reasons,
 *                     BOOLEAN printer-is-accepting-jobs)
 * Printer's media-supported attribute has changed.
 *
 * PrinterAdded(STRING text,
 *              STRING printer-uri,
 *              STRING printer-name,
 *              UINT32 printer-state,
 *              STRING printer-state-reasons,
 *              BOOLEAN printer-is-accepting-jobs)
 * Printer has been added.
 *
 * PrinterDeleted(STRING text,
 *                STRING printer-uri,
 *                STRING printer-name,
 *                UINT32 printer-state,
 *                STRING printer-state-reasons,
 *                BOOLEAN printer-is-accepting-jobs)
 * Printer has been deleted.
 *
 * PrinterModified(STRING text,
 *                 STRING printer-uri,
 *                 STRING printer-name,
 *                 UINT32 printer-state,
 *                 STRING printer-state-reasons,
 *                 BOOLEAN printer-is-accepting-jobs)
 * Printer has been modified.
 *
 * text describes the event.
 * printer-state-reasons is a comma-separated list.
 * If printer-uri is "" in a Job* signal, the other printer-* parameters
 * must be ignored.
 * If the job name is not know, job-name will be "".
 */

/*
 * Constants...
 */

enum
{
  PARAMS_NONE,
  PARAMS_PRINTER,
  PARAMS_JOB
};


/*
 * Local functions...
 */

static int	acquire_lock(int *fd, char *lockfile, size_t locksize);


/*
 * 'main()' - Read events and send DBUS notifications.
 */

int					/* O - Exit status */
main(int  argc,				/* I - Number of command-line args */
     char *argv[])			/* I - Command-line arguments */
{
  ipp_t			*msg;		/* Event message from scheduler */
  ipp_state_t		state;		/* IPP event state */
  struct sigaction	action;		/* POSIX sigaction data */
  DBusConnection	*con = NULL;	/* Connection to DBUS server */
  DBusError		error;		/* Error, if any */
  DBusMessage		*message;	/* Message to send */
  DBusMessageIter	iter;		/* Iterator for message data */
  int			lock_fd = -1;	/* Lock file descriptor */
  char			lock_filename[1024];
					/* Lock filename */


 /*
  * Don't buffer stderr...
  */

  setbuf(stderr, NULL);

 /*
  * Ignore SIGPIPE signals...
  */

  memset(&action, 0, sizeof(action));
  action.sa_handler = SIG_IGN;
  sigaction(SIGPIPE, &action, NULL);

 /*
  * Validate command-line options...
  */

  if (argc != 3)
  {
    fputs("Usage: dbus dbus:/// notify-user-data\n", stderr);
    return (1);
  }

  if (strncmp(argv[1], "dbus:", 5))
  {
    fprintf(stderr, "ERROR: Bad URI \"%s\"!\n", argv[1]);
    return (1);
  }

 /*
  * Loop forever until we run out of events...
  */

  for (;;)
  {
    ipp_attribute_t	*attr;		/* Current attribute */
    const char		*event;		/* Event name */
    const char		*signame = NULL;/* DBUS signal name */
    char		*printer_reasons = NULL;
					/* Printer reasons string */
    const char		*nul = "";	/* Empty string value */
    int			no = 0;		/* Boolean "no" value */
    int			params = PARAMS_NONE;
					/* What parameters to include? */


   /*
    * Get the next event...
    */

    msg = ippNew();
    while ((state = ippReadFile(0, msg)) != IPP_DATA)
    {
      if (state <= IPP_IDLE)
        break;
    }

    fprintf(stderr, "DEBUG: state=%d\n", state);

    if (state == IPP_ERROR)
      fputs("DEBUG: ippReadFile() returned IPP_ERROR!\n", stderr);

    if (state <= IPP_IDLE)
    {
     /*
      * Out of messages, free memory and then exit...
      */

      ippDelete(msg);
      break;
    }

   /*
    * Verify connection to DBUS server...
    */

    if (con && !dbus_connection_get_is_connected(con))
    {
      dbus_connection_unref(con);
      con = NULL;
    }

    if (!con)
    {
      dbus_error_init(&error);

      con = dbus_bus_get(DBUS_BUS_SYSTEM, &error);
      if (!con)
	dbus_error_free(&error);
      else
	fputs("DEBUG: Connected to D-BUS\n", stderr);
    }

    if (!con)
      continue;

    if (lock_fd == -1 &&
        acquire_lock(&lock_fd, lock_filename, sizeof(lock_filename)))
      continue;

    attr = ippFindAttribute(msg, "notify-subscribed-event",
			     IPP_TAG_KEYWORD);
    if (!attr)
      continue;

    event = attr->values[0].string.text;
    if (!strncmp(event, "server-", 7))
    {
      const char *word2 = event + 7;	/* Second word */

      if (!strcmp(word2, "restarted"))
	signame = "ServerRestarted";
      else if (!strcmp(word2, "started"))
	signame = "ServerStarted";
      else if (!strcmp(word2, "stopped"))
	signame = "ServerStopped";
      else if (!strcmp(word2, "audit"))
	signame = "ServerAudit";
      else
	continue;
    }
    else if (!strncmp(event, "printer-", 8))
    {
      const char *word2 = event + 8;	/* Second word */

      params = PARAMS_PRINTER;
      if (!strcmp(word2, "restarted"))
	signame = "PrinterRestarted";
      else if (!strcmp(word2, "shutdown"))
	signame = "PrinterShutdown";
      else if (!strcmp(word2, "stopped"))
	signame = "PrinterStopped";
      else if (!strcmp(word2, "state-changed"))
	signame = "PrinterStateChanged";
      else if (!strcmp(word2, "finishings-changed"))
	signame = "PrinterFinishingsChanged";
      else if (!strcmp(word2, "media-changed"))
	signame = "PrinterMediaChanged";
      else if (!strcmp(word2, "added"))
	signame = "PrinterAdded";
      else if (!strcmp(word2, "deleted"))
	signame = "PrinterDeleted";
      else if (!strcmp(word2, "modified"))
	signame = "PrinterModified";
      else
	continue;
    }
    else if (!strncmp(event, "job-", 4))
    {
      const char *word2 = event + 4;	/* Second word */

      params = PARAMS_JOB;
      if (!strcmp(word2, "state"))
	signame = "JobState";
      else if (!strcmp(word2, "created"))
	signame = "JobCreated";
      else if (!strcmp(word2, "completed"))
	signame = "JobCompleted";
      else if (!strcmp(word2, "stopped"))
	signame = "JobStopped";
      else if (!strcmp(word2, "config-changed"))
	signame = "JobConfigChanged";
      else if (!strcmp(word2, "progress"))
	signame = "JobProgress";
      else
	continue;
    }
    else
      continue;

    /*
     * Create and send the new message...
     */
    
    fprintf(stderr, "DEBUG: %s\n", signame);
    message = dbus_message_new_signal("/org/cups/cupsd/Notifier",
				      "org.cups.cupsd.Notifier",
				      signame);

    dbus_message_append_iter_init(message, &iter);
    attr = ippFindAttribute(msg, "notify-text", IPP_TAG_TEXT);
    if (!attr)
      goto bail;
    dbus_message_iter_append_string(&iter, &(attr->values[0].string.text));

    if (params >= PARAMS_PRINTER)
    {
      char	*p;			/* Pointer into printer_reasons */
      size_t	reasons_length;		/* Required size of printer_reasons */
      int	i;			/* Looping var */
      int	have_printer_params = 1;/* Do we have printer URI? */

      /* STRING printer-uri or "" */
      attr = ippFindAttribute(msg, "notify-printer-uri", IPP_TAG_URI);
      if (attr)
	dbus_message_iter_append_string(&iter, &(attr->values[0].string.text));
      else
      {
	have_printer_params = 0;
	dbus_message_iter_append_string(&iter, &nul);
      }

      /* STRING printer-name */
      if (have_printer_params)
      {
	attr = ippFindAttribute(msg, "printer-name", IPP_TAG_NAME);
	if (attr)
	  dbus_message_iter_append_string(&iter,
					  &(attr->values[0].string.text));
	else
	  goto bail;
      }
      else
	dbus_message_iter_append_string(&iter, &nul);

      /* UINT32 printer-state */
      if (have_printer_params)
      {
	attr = ippFindAttribute(msg, "printer-state", IPP_TAG_ENUM);
	if (attr)
	  dbus_message_iter_append_uint32(&iter, &(attr->values[0].integer));
	else
	  goto bail;
      }
      else
	dbus_message_iter_append_uint32(&iter, &no);

      /* STRING printer-state-reasons */
      if (have_printer_params)
      {
	attr = ippFindAttribute(msg, "printer-state-reasons",
				IPP_TAG_KEYWORD);
	if (attr)
	{
	  for (reasons_length = 0, i = 0; i < attr->num_values; i++)
	    /* All need commas except the last, which needs a nul byte. */
	    reasons_length += 1 + strlen(attr->values[i].string.text);
	  printer_reasons = malloc(reasons_length);
	  if (!printer_reasons)
	    goto bail;
	  p = printer_reasons;
	  for (i = 0; i < attr->num_values; i++)
	  {
	    strcpy(p, attr->values[i].string.text);
	    p += strlen(p);
	    if (i)
	      *p++ = ',';
	  }
	  dbus_message_iter_append_string(&iter, &printer_reasons);
	}
	else
	  goto bail;
      }
      else
	dbus_message_iter_append_string(&iter, &nul);

      /* BOOL printer-is-accepting-jobs */
      if (have_printer_params)
      {
	attr = ippFindAttribute(msg, "printer-is-accepting-jobs",
				IPP_TAG_BOOLEAN);
	if (attr)
	  dbus_message_iter_append_boolean(&iter, &(attr->values[0].boolean));
	else
	  goto bail;
      }
      else
	dbus_message_iter_append_boolean(&iter, &no);
    }

    if (params >= PARAMS_JOB)
    {
      /* UINT32 job-id */
      attr = ippFindAttribute(msg, "notify-job-id", IPP_TAG_INTEGER);
      if (!attr)
	goto bail;
      dbus_message_iter_append_uint32(&iter, &(attr->values[0].integer));

      /* UINT32 job-state */
      attr = ippFindAttribute(msg, "job-state", IPP_TAG_ENUM);
      if (!attr)
	goto bail;
      dbus_message_iter_append_uint32(&iter, &(attr->values[0].integer));

      /* STRING job-state-reasons */
      attr = ippFindAttribute(msg, "job-state-reasons", IPP_TAG_KEYWORD);
      if (!attr)
	goto bail;
      dbus_message_iter_append_string(&iter, &(attr->values[0].string.text));

      /* STRING job-name or "" */
      attr = ippFindAttribute(msg, "job-name", IPP_TAG_NAME);
      if (attr)
	dbus_message_iter_append_string(&iter, &(attr->values[0].string.text));
      else
	dbus_message_iter_append_string(&iter, &nul);

      /* UINT32 job-impressions-completed */
      attr = ippFindAttribute(msg, "job-impressions-completed",
			      IPP_TAG_INTEGER);
      if (!attr)
	goto bail;
      dbus_message_iter_append_uint32(&iter, &(attr->values[0].integer));
    }

    dbus_connection_send(con, message, NULL);
    dbus_connection_flush(con);

   /*
    * Cleanup...
    */

    bail:

    if (printer_reasons)
      free(printer_reasons);

    dbus_message_unref(message);
    ippDelete(msg);
  }

 /*
  * Remove lock file...
  */

  if (lock_fd >= 0)
  {
    close(lock_fd);
    unlink(lock_filename);
  }

  return (0);
}


/*
 * 'acquire_lock()' - Acquire a lock so we only have a single notifier running.
 */

static int				/* O - 0 on success, -1 on failure */
acquire_lock(int    *fd,		/* O - Lock file descriptor */
             char   *lockfile,		/* I - Lock filename buffer */
	     size_t locksize)		/* I - Size of filename buffer */
{
  const char	*tmpdir;		/* Temporary directory */


 /*
  * Figure out where to put the lock file...
  */

  if ((tmpdir = getenv("TMPDIR")) == NULL)
    tmpdir = "/tmp";

  snprintf(lockfile, locksize, "%s/cups-dbus-notifier-lockfile", tmpdir);

 /*
  * Create the lock file and fail if it already exists...
  */

  if ((*fd = open(lockfile, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR)) < 0)
    return (-1);
  else
    return (0);
}


/*
 * End of "$Id$".
 */