D-Bus  1.6.12
dbus-transport-socket.c
1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
2 /* dbus-transport-socket.c Socket subclasses of DBusTransport
3  *
4  * Copyright (C) 2002, 2003, 2004, 2006 Red Hat Inc.
5  *
6  * Licensed under the Academic Free License version 2.1
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 2 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, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  *
22  */
23 
24 #include <config.h>
25 #include "dbus-internals.h"
26 #include "dbus-connection-internal.h"
27 #include "dbus-nonce.h"
28 #include "dbus-transport-socket.h"
29 #include "dbus-transport-protected.h"
30 #include "dbus-watch.h"
31 #include "dbus-credentials.h"
32 
45 
50 {
52  int fd;
69 };
70 
71 static void
72 free_watches (DBusTransport *transport)
73 {
74  DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
75 
76  _dbus_verbose ("start\n");
77 
78  if (socket_transport->read_watch)
79  {
80  if (transport->connection)
82  socket_transport->read_watch);
83  _dbus_watch_invalidate (socket_transport->read_watch);
84  _dbus_watch_unref (socket_transport->read_watch);
85  socket_transport->read_watch = NULL;
86  }
87 
88  if (socket_transport->write_watch)
89  {
90  if (transport->connection)
92  socket_transport->write_watch);
93  _dbus_watch_invalidate (socket_transport->write_watch);
94  _dbus_watch_unref (socket_transport->write_watch);
95  socket_transport->write_watch = NULL;
96  }
97 
98  _dbus_verbose ("end\n");
99 }
100 
101 static void
102 socket_finalize (DBusTransport *transport)
103 {
104  DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
105 
106  _dbus_verbose ("\n");
107 
108  free_watches (transport);
109 
110  _dbus_string_free (&socket_transport->encoded_outgoing);
111  _dbus_string_free (&socket_transport->encoded_incoming);
112 
113  _dbus_transport_finalize_base (transport);
114 
115  _dbus_assert (socket_transport->read_watch == NULL);
116  _dbus_assert (socket_transport->write_watch == NULL);
117 
118  dbus_free (transport);
119 }
120 
121 static void
122 check_write_watch (DBusTransport *transport)
123 {
124  DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
125  dbus_bool_t needed;
126 
127  if (transport->connection == NULL)
128  return;
129 
130  if (transport->disconnected)
131  {
132  _dbus_assert (socket_transport->write_watch == NULL);
133  return;
134  }
135 
136  _dbus_transport_ref (transport);
137 
138  if (_dbus_transport_get_is_authenticated (transport))
140  else
141  {
142  if (transport->send_credentials_pending)
143  needed = TRUE;
144  else
145  {
146  DBusAuthState auth_state;
147 
148  auth_state = _dbus_auth_do_work (transport->auth);
149 
150  /* If we need memory we install the write watch just in case,
151  * if there's no need for it, it will get de-installed
152  * next time we try reading.
153  */
154  if (auth_state == DBUS_AUTH_STATE_HAVE_BYTES_TO_SEND ||
155  auth_state == DBUS_AUTH_STATE_WAITING_FOR_MEMORY)
156  needed = TRUE;
157  else
158  needed = FALSE;
159  }
160  }
161 
162  _dbus_verbose ("check_write_watch(): needed = %d on connection %p watch %p fd = %d outgoing messages exist %d\n",
163  needed, transport->connection, socket_transport->write_watch,
164  socket_transport->fd,
166 
168  socket_transport->write_watch,
169  needed);
170 
171  _dbus_transport_unref (transport);
172 }
173 
174 static void
175 check_read_watch (DBusTransport *transport)
176 {
177  DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
178  dbus_bool_t need_read_watch;
179 
180  _dbus_verbose ("fd = %d\n",socket_transport->fd);
181 
182  if (transport->connection == NULL)
183  return;
184 
185  if (transport->disconnected)
186  {
187  _dbus_assert (socket_transport->read_watch == NULL);
188  return;
189  }
190 
191  _dbus_transport_ref (transport);
192 
193  if (_dbus_transport_get_is_authenticated (transport))
194  need_read_watch =
197  else
198  {
199  if (transport->receive_credentials_pending)
200  need_read_watch = TRUE;
201  else
202  {
203  /* The reason to disable need_read_watch when not WAITING_FOR_INPUT
204  * is to avoid spinning on the file descriptor when we're waiting
205  * to write or for some other part of the auth process
206  */
207  DBusAuthState auth_state;
208 
209  auth_state = _dbus_auth_do_work (transport->auth);
210 
211  /* If we need memory we install the read watch just in case,
212  * if there's no need for it, it will get de-installed
213  * next time we try reading. If we're authenticated we
214  * install it since we normally have it installed while
215  * authenticated.
216  */
217  if (auth_state == DBUS_AUTH_STATE_WAITING_FOR_INPUT ||
218  auth_state == DBUS_AUTH_STATE_WAITING_FOR_MEMORY ||
219  auth_state == DBUS_AUTH_STATE_AUTHENTICATED)
220  need_read_watch = TRUE;
221  else
222  need_read_watch = FALSE;
223  }
224  }
225 
226  _dbus_verbose (" setting read watch enabled = %d\n", need_read_watch);
228  socket_transport->read_watch,
229  need_read_watch);
230 
231  _dbus_transport_unref (transport);
232 }
233 
234 static void
235 do_io_error (DBusTransport *transport)
236 {
237  _dbus_transport_ref (transport);
238  _dbus_transport_disconnect (transport);
239  _dbus_transport_unref (transport);
240 }
241 
242 /* return value is whether we successfully read any new data. */
243 static dbus_bool_t
244 read_data_into_auth (DBusTransport *transport,
245  dbus_bool_t *oom)
246 {
247  DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
248  DBusString *buffer;
249  int bytes_read;
250 
251  *oom = FALSE;
252 
253  _dbus_auth_get_buffer (transport->auth, &buffer);
254 
255  bytes_read = _dbus_read_socket (socket_transport->fd,
256  buffer, socket_transport->max_bytes_read_per_iteration);
257 
258  _dbus_auth_return_buffer (transport->auth, buffer,
259  bytes_read > 0 ? bytes_read : 0);
260 
261  if (bytes_read > 0)
262  {
263  _dbus_verbose (" read %d bytes in auth phase\n", bytes_read);
264 
265  return TRUE;
266  }
267  else if (bytes_read < 0)
268  {
269  /* EINTR already handled for us */
270 
272  {
273  *oom = TRUE;
274  }
276  ; /* do nothing, just return FALSE below */
277  else
278  {
279  _dbus_verbose ("Error reading from remote app: %s\n",
281  do_io_error (transport);
282  }
283 
284  return FALSE;
285  }
286  else
287  {
288  _dbus_assert (bytes_read == 0);
289 
290  _dbus_verbose ("Disconnected from remote app\n");
291  do_io_error (transport);
292 
293  return FALSE;
294  }
295 }
296 
297 /* Return value is whether we successfully wrote any bytes */
298 static dbus_bool_t
299 write_data_from_auth (DBusTransport *transport)
300 {
301  DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
302  int bytes_written;
303  const DBusString *buffer;
304 
305  if (!_dbus_auth_get_bytes_to_send (transport->auth,
306  &buffer))
307  return FALSE;
308 
309  bytes_written = _dbus_write_socket (socket_transport->fd,
310  buffer,
311  0, _dbus_string_get_length (buffer));
312 
313  if (bytes_written > 0)
314  {
315  _dbus_auth_bytes_sent (transport->auth, bytes_written);
316  return TRUE;
317  }
318  else if (bytes_written < 0)
319  {
320  /* EINTR already handled for us */
321 
323  ;
324  else
325  {
326  _dbus_verbose ("Error writing to remote app: %s\n",
328  do_io_error (transport);
329  }
330  }
331 
332  return FALSE;
333 }
334 
335 /* FALSE on OOM */
336 static dbus_bool_t
337 exchange_credentials (DBusTransport *transport,
338  dbus_bool_t do_reading,
339  dbus_bool_t do_writing)
340 {
341  DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
342  DBusError error = DBUS_ERROR_INIT;
343 
344  _dbus_verbose ("exchange_credentials: do_reading = %d, do_writing = %d\n",
345  do_reading, do_writing);
346 
347  if (do_writing && transport->send_credentials_pending)
348  {
349  if (_dbus_send_credentials_socket (socket_transport->fd,
350  &error))
351  {
352  transport->send_credentials_pending = FALSE;
353  }
354  else
355  {
356  _dbus_verbose ("Failed to write credentials: %s\n", error.message);
357  dbus_error_free (&error);
358  do_io_error (transport);
359  }
360  }
361 
362  if (do_reading && transport->receive_credentials_pending)
363  {
364  /* FIXME this can fail due to IO error _or_ OOM, broken
365  * (somewhat tricky to fix since the OOM error can be set after
366  * we already read the credentials byte, so basically we need to
367  * separate reading the byte and storing it in the
368  * transport->credentials). Does not really matter for now
369  * because storing in credentials never actually fails on unix.
370  */
371  if (_dbus_read_credentials_socket (socket_transport->fd,
372  transport->credentials,
373  &error))
374  {
375  transport->receive_credentials_pending = FALSE;
376  }
377  else
378  {
379  _dbus_verbose ("Failed to read credentials %s\n", error.message);
380  dbus_error_free (&error);
381  do_io_error (transport);
382  }
383  }
384 
385  if (!(transport->send_credentials_pending ||
386  transport->receive_credentials_pending))
387  {
388  if (!_dbus_auth_set_credentials (transport->auth,
389  transport->credentials))
390  return FALSE;
391  }
392 
393  return TRUE;
394 }
395 
396 static dbus_bool_t
397 do_authentication (DBusTransport *transport,
398  dbus_bool_t do_reading,
399  dbus_bool_t do_writing,
400  dbus_bool_t *auth_completed)
401 {
402  dbus_bool_t oom;
403  dbus_bool_t orig_auth_state;
404 
405  oom = FALSE;
406 
407  orig_auth_state = _dbus_transport_get_is_authenticated (transport);
408 
409  /* This is essential to avoid the check_write_watch() at the end,
410  * we don't want to add a write watch in do_iteration before
411  * we try writing and get EAGAIN
412  */
413  if (orig_auth_state)
414  {
415  if (auth_completed)
416  *auth_completed = FALSE;
417  return TRUE;
418  }
419 
420  _dbus_transport_ref (transport);
421 
422  while (!_dbus_transport_get_is_authenticated (transport) &&
424  {
425  if (!exchange_credentials (transport, do_reading, do_writing))
426  {
427  /* OOM */
428  oom = TRUE;
429  goto out;
430  }
431 
432  if (transport->send_credentials_pending ||
433  transport->receive_credentials_pending)
434  {
435  _dbus_verbose ("send_credentials_pending = %d receive_credentials_pending = %d\n",
436  transport->send_credentials_pending,
437  transport->receive_credentials_pending);
438  goto out;
439  }
440 
441 #define TRANSPORT_SIDE(t) ((t)->is_server ? "server" : "client")
442  switch (_dbus_auth_do_work (transport->auth))
443  {
444  case DBUS_AUTH_STATE_WAITING_FOR_INPUT:
445  _dbus_verbose (" %s auth state: waiting for input\n",
446  TRANSPORT_SIDE (transport));
447  if (!do_reading || !read_data_into_auth (transport, &oom))
448  goto out;
449  break;
450 
451  case DBUS_AUTH_STATE_WAITING_FOR_MEMORY:
452  _dbus_verbose (" %s auth state: waiting for memory\n",
453  TRANSPORT_SIDE (transport));
454  oom = TRUE;
455  goto out;
456  break;
457 
458  case DBUS_AUTH_STATE_HAVE_BYTES_TO_SEND:
459  _dbus_verbose (" %s auth state: bytes to send\n",
460  TRANSPORT_SIDE (transport));
461  if (!do_writing || !write_data_from_auth (transport))
462  goto out;
463  break;
464 
465  case DBUS_AUTH_STATE_NEED_DISCONNECT:
466  _dbus_verbose (" %s auth state: need to disconnect\n",
467  TRANSPORT_SIDE (transport));
468  do_io_error (transport);
469  break;
470 
471  case DBUS_AUTH_STATE_AUTHENTICATED:
472  _dbus_verbose (" %s auth state: authenticated\n",
473  TRANSPORT_SIDE (transport));
474  break;
475  }
476  }
477 
478  out:
479  if (auth_completed)
480  *auth_completed = (orig_auth_state != _dbus_transport_get_is_authenticated (transport));
481 
482  check_read_watch (transport);
483  check_write_watch (transport);
484  _dbus_transport_unref (transport);
485 
486  if (oom)
487  return FALSE;
488  else
489  return TRUE;
490 }
491 
492 /* returns false on oom */
493 static dbus_bool_t
494 do_writing (DBusTransport *transport)
495 {
496  int total;
497  DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
498  dbus_bool_t oom;
499 
500  /* No messages without authentication! */
501  if (!_dbus_transport_get_is_authenticated (transport))
502  {
503  _dbus_verbose ("Not authenticated, not writing anything\n");
504  return TRUE;
505  }
506 
507  if (transport->disconnected)
508  {
509  _dbus_verbose ("Not connected, not writing anything\n");
510  return TRUE;
511  }
512 
513 #if 1
514  _dbus_verbose ("do_writing(), have_messages = %d, fd = %d\n",
516  socket_transport->fd);
517 #endif
518 
519  oom = FALSE;
520  total = 0;
521 
522  while (!transport->disconnected &&
524  {
525  int bytes_written;
526  DBusMessage *message;
527  const DBusString *header;
528  const DBusString *body;
529  int header_len, body_len;
530  int total_bytes_to_write;
531 
532  if (total > socket_transport->max_bytes_written_per_iteration)
533  {
534  _dbus_verbose ("%d bytes exceeds %d bytes written per iteration, returning\n",
535  total, socket_transport->max_bytes_written_per_iteration);
536  goto out;
537  }
538 
539  message = _dbus_connection_get_message_to_send (transport->connection);
540  _dbus_assert (message != NULL);
541  dbus_message_lock (message);
542 
543 #if 0
544  _dbus_verbose ("writing message %p\n", message);
545 #endif
546 
548  &header, &body);
549 
550  header_len = _dbus_string_get_length (header);
551  body_len = _dbus_string_get_length (body);
552 
553  if (_dbus_auth_needs_encoding (transport->auth))
554  {
555  /* Does fd passing even make sense with encoded data? */
556  _dbus_assert(!DBUS_TRANSPORT_CAN_SEND_UNIX_FD(transport));
557 
558  if (_dbus_string_get_length (&socket_transport->encoded_outgoing) == 0)
559  {
560  if (!_dbus_auth_encode_data (transport->auth,
561  header, &socket_transport->encoded_outgoing))
562  {
563  oom = TRUE;
564  goto out;
565  }
566 
567  if (!_dbus_auth_encode_data (transport->auth,
568  body, &socket_transport->encoded_outgoing))
569  {
570  _dbus_string_set_length (&socket_transport->encoded_outgoing, 0);
571  oom = TRUE;
572  goto out;
573  }
574  }
575 
576  total_bytes_to_write = _dbus_string_get_length (&socket_transport->encoded_outgoing);
577 
578 #if 0
579  _dbus_verbose ("encoded message is %d bytes\n",
580  total_bytes_to_write);
581 #endif
582 
583  bytes_written =
584  _dbus_write_socket (socket_transport->fd,
585  &socket_transport->encoded_outgoing,
586  socket_transport->message_bytes_written,
587  total_bytes_to_write - socket_transport->message_bytes_written);
588  }
589  else
590  {
591  total_bytes_to_write = header_len + body_len;
592 
593 #if 0
594  _dbus_verbose ("message is %d bytes\n",
595  total_bytes_to_write);
596 #endif
597 
598 #ifdef HAVE_UNIX_FD_PASSING
599  if (socket_transport->message_bytes_written <= 0 && DBUS_TRANSPORT_CAN_SEND_UNIX_FD(transport))
600  {
601  /* Send the fds along with the first byte of the message */
602  const int *unix_fds;
603  unsigned n;
604 
605  _dbus_message_get_unix_fds(message, &unix_fds, &n);
606 
607  bytes_written =
608  _dbus_write_socket_with_unix_fds_two (socket_transport->fd,
609  header,
610  socket_transport->message_bytes_written,
611  header_len - socket_transport->message_bytes_written,
612  body,
613  0, body_len,
614  unix_fds,
615  n);
616 
617  if (bytes_written > 0 && n > 0)
618  _dbus_verbose("Wrote %i unix fds\n", n);
619  }
620  else
621 #endif
622  {
623  if (socket_transport->message_bytes_written < header_len)
624  {
625  bytes_written =
626  _dbus_write_socket_two (socket_transport->fd,
627  header,
628  socket_transport->message_bytes_written,
629  header_len - socket_transport->message_bytes_written,
630  body,
631  0, body_len);
632  }
633  else
634  {
635  bytes_written =
636  _dbus_write_socket (socket_transport->fd,
637  body,
638  (socket_transport->message_bytes_written - header_len),
639  body_len -
640  (socket_transport->message_bytes_written - header_len));
641  }
642  }
643  }
644 
645  if (bytes_written < 0)
646  {
647  /* EINTR already handled for us */
648 
649  /* For some discussion of why we also ignore EPIPE here, see
650  * http://lists.freedesktop.org/archives/dbus/2008-March/009526.html
651  */
652 
654  goto out;
655  else
656  {
657  _dbus_verbose ("Error writing to remote app: %s\n",
659  do_io_error (transport);
660  goto out;
661  }
662  }
663  else
664  {
665  _dbus_verbose (" wrote %d bytes of %d\n", bytes_written,
666  total_bytes_to_write);
667 
668  total += bytes_written;
669  socket_transport->message_bytes_written += bytes_written;
670 
671  _dbus_assert (socket_transport->message_bytes_written <=
672  total_bytes_to_write);
673 
674  if (socket_transport->message_bytes_written == total_bytes_to_write)
675  {
676  socket_transport->message_bytes_written = 0;
677  _dbus_string_set_length (&socket_transport->encoded_outgoing, 0);
678  _dbus_string_compact (&socket_transport->encoded_outgoing, 2048);
679 
681  message);
682  }
683  }
684  }
685 
686  out:
687  if (oom)
688  return FALSE;
689  else
690  return TRUE;
691 }
692 
693 /* returns false on out-of-memory */
694 static dbus_bool_t
695 do_reading (DBusTransport *transport)
696 {
697  DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
698  DBusString *buffer;
699  int bytes_read;
700  int total;
701  dbus_bool_t oom;
702 
703  _dbus_verbose ("fd = %d\n",socket_transport->fd);
704 
705  /* No messages without authentication! */
706  if (!_dbus_transport_get_is_authenticated (transport))
707  return TRUE;
708 
709  oom = FALSE;
710 
711  total = 0;
712 
713  again:
714 
715  /* See if we've exceeded max messages and need to disable reading */
716  check_read_watch (transport);
717 
718  if (total > socket_transport->max_bytes_read_per_iteration)
719  {
720  _dbus_verbose ("%d bytes exceeds %d bytes read per iteration, returning\n",
721  total, socket_transport->max_bytes_read_per_iteration);
722  goto out;
723  }
724 
725  _dbus_assert (socket_transport->read_watch != NULL ||
726  transport->disconnected);
727 
728  if (transport->disconnected)
729  goto out;
730 
731  if (!dbus_watch_get_enabled (socket_transport->read_watch))
732  return TRUE;
733 
734  if (_dbus_auth_needs_decoding (transport->auth))
735  {
736  /* Does fd passing even make sense with encoded data? */
737  _dbus_assert(!DBUS_TRANSPORT_CAN_SEND_UNIX_FD(transport));
738 
739  if (_dbus_string_get_length (&socket_transport->encoded_incoming) > 0)
740  bytes_read = _dbus_string_get_length (&socket_transport->encoded_incoming);
741  else
742  bytes_read = _dbus_read_socket (socket_transport->fd,
743  &socket_transport->encoded_incoming,
744  socket_transport->max_bytes_read_per_iteration);
745 
746  _dbus_assert (_dbus_string_get_length (&socket_transport->encoded_incoming) ==
747  bytes_read);
748 
749  if (bytes_read > 0)
750  {
751  int orig_len;
752 
754  &buffer);
755 
756  orig_len = _dbus_string_get_length (buffer);
757 
758  if (!_dbus_auth_decode_data (transport->auth,
759  &socket_transport->encoded_incoming,
760  buffer))
761  {
762  _dbus_verbose ("Out of memory decoding incoming data\n");
764  buffer,
765  _dbus_string_get_length (buffer) - orig_len);
766 
767  oom = TRUE;
768  goto out;
769  }
770 
772  buffer,
773  _dbus_string_get_length (buffer) - orig_len);
774 
775  _dbus_string_set_length (&socket_transport->encoded_incoming, 0);
776  _dbus_string_compact (&socket_transport->encoded_incoming, 2048);
777  }
778  }
779  else
780  {
782  &buffer);
783 
784 #ifdef HAVE_UNIX_FD_PASSING
785  if (DBUS_TRANSPORT_CAN_SEND_UNIX_FD(transport))
786  {
787  int *fds, n_fds;
788 
789  if (!_dbus_message_loader_get_unix_fds(transport->loader, &fds, &n_fds))
790  {
791  _dbus_verbose ("Out of memory reading file descriptors\n");
792  _dbus_message_loader_return_buffer (transport->loader, buffer, 0);
793  oom = TRUE;
794  goto out;
795  }
796 
797  bytes_read = _dbus_read_socket_with_unix_fds(socket_transport->fd,
798  buffer,
799  socket_transport->max_bytes_read_per_iteration,
800  fds, &n_fds);
801 
802  if (bytes_read >= 0 && n_fds > 0)
803  _dbus_verbose("Read %i unix fds\n", n_fds);
804 
805  _dbus_message_loader_return_unix_fds(transport->loader, fds, bytes_read < 0 ? 0 : n_fds);
806  }
807  else
808 #endif
809  {
810  bytes_read = _dbus_read_socket (socket_transport->fd,
811  buffer, socket_transport->max_bytes_read_per_iteration);
812  }
813 
815  buffer,
816  bytes_read < 0 ? 0 : bytes_read);
817  }
818 
819  if (bytes_read < 0)
820  {
821  /* EINTR already handled for us */
822 
824  {
825  _dbus_verbose ("Out of memory in read()/do_reading()\n");
826  oom = TRUE;
827  goto out;
828  }
830  goto out;
831  else
832  {
833  _dbus_verbose ("Error reading from remote app: %s\n",
835  do_io_error (transport);
836  goto out;
837  }
838  }
839  else if (bytes_read == 0)
840  {
841  _dbus_verbose ("Disconnected from remote app\n");
842  do_io_error (transport);
843  goto out;
844  }
845  else
846  {
847  _dbus_verbose (" read %d bytes\n", bytes_read);
848 
849  total += bytes_read;
850 
851  if (!_dbus_transport_queue_messages (transport))
852  {
853  oom = TRUE;
854  _dbus_verbose (" out of memory when queueing messages we just read in the transport\n");
855  goto out;
856  }
857 
858  /* Try reading more data until we get EAGAIN and return, or
859  * exceed max bytes per iteration. If in blocking mode of
860  * course we'll block instead of returning.
861  */
862  goto again;
863  }
864 
865  out:
866  if (oom)
867  return FALSE;
868  else
869  return TRUE;
870 }
871 
872 static dbus_bool_t
873 unix_error_with_read_to_come (DBusTransport *itransport,
874  DBusWatch *watch,
875  unsigned int flags)
876 {
877  DBusTransportSocket *transport = (DBusTransportSocket *) itransport;
878 
879  if (!(flags & DBUS_WATCH_HANGUP || flags & DBUS_WATCH_ERROR))
880  return FALSE;
881 
882  /* If we have a read watch enabled ...
883  we -might have data incoming ... => handle the HANGUP there */
884  if (watch != transport->read_watch &&
885  _dbus_watch_get_enabled (transport->read_watch))
886  return FALSE;
887 
888  return TRUE;
889 }
890 
891 static dbus_bool_t
892 socket_handle_watch (DBusTransport *transport,
893  DBusWatch *watch,
894  unsigned int flags)
895 {
896  DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
897 
898  _dbus_assert (watch == socket_transport->read_watch ||
899  watch == socket_transport->write_watch);
900  _dbus_assert (watch != NULL);
901 
902  /* If we hit an error here on a write watch, don't disconnect the transport yet because data can
903  * still be in the buffer and do_reading may need several iteration to read
904  * it all (because of its max_bytes_read_per_iteration limit).
905  */
906  if (!(flags & DBUS_WATCH_READABLE) && unix_error_with_read_to_come (transport, watch, flags))
907  {
908  _dbus_verbose ("Hang up or error on watch\n");
909  _dbus_transport_disconnect (transport);
910  return TRUE;
911  }
912 
913  if (watch == socket_transport->read_watch &&
914  (flags & DBUS_WATCH_READABLE))
915  {
916  dbus_bool_t auth_finished;
917 #if 1
918  _dbus_verbose ("handling read watch %p flags = %x\n",
919  watch, flags);
920 #endif
921  if (!do_authentication (transport, TRUE, FALSE, &auth_finished))
922  return FALSE;
923 
924  /* We don't want to do a read immediately following
925  * a successful authentication. This is so we
926  * have a chance to propagate the authentication
927  * state further up. Specifically, we need to
928  * process any pending data from the auth object.
929  */
930  if (!auth_finished)
931  {
932  if (!do_reading (transport))
933  {
934  _dbus_verbose ("no memory to read\n");
935  return FALSE;
936  }
937  }
938  else
939  {
940  _dbus_verbose ("Not reading anything since we just completed the authentication\n");
941  }
942  }
943  else if (watch == socket_transport->write_watch &&
944  (flags & DBUS_WATCH_WRITABLE))
945  {
946 #if 1
947  _dbus_verbose ("handling write watch, have_outgoing_messages = %d\n",
949 #endif
950  if (!do_authentication (transport, FALSE, TRUE, NULL))
951  return FALSE;
952 
953  if (!do_writing (transport))
954  {
955  _dbus_verbose ("no memory to write\n");
956  return FALSE;
957  }
958 
959  /* See if we still need the write watch */
960  check_write_watch (transport);
961  }
962 #ifdef DBUS_ENABLE_VERBOSE_MODE
963  else
964  {
965  if (watch == socket_transport->read_watch)
966  _dbus_verbose ("asked to handle read watch with non-read condition 0x%x\n",
967  flags);
968  else if (watch == socket_transport->write_watch)
969  _dbus_verbose ("asked to handle write watch with non-write condition 0x%x\n",
970  flags);
971  else
972  _dbus_verbose ("asked to handle watch %p on fd %d that we don't recognize\n",
973  watch, dbus_watch_get_socket (watch));
974  }
975 #endif /* DBUS_ENABLE_VERBOSE_MODE */
976 
977  return TRUE;
978 }
979 
980 static void
981 socket_disconnect (DBusTransport *transport)
982 {
983  DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
984 
985  _dbus_verbose ("\n");
986 
987  free_watches (transport);
988 
989  _dbus_close_socket (socket_transport->fd, NULL);
990  socket_transport->fd = -1;
991 }
992 
993 static dbus_bool_t
994 socket_connection_set (DBusTransport *transport)
995 {
996  DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
997 
998  _dbus_watch_set_handler (socket_transport->write_watch,
1000  transport->connection, NULL);
1001 
1002  _dbus_watch_set_handler (socket_transport->read_watch,
1004  transport->connection, NULL);
1005 
1007  socket_transport->write_watch))
1008  return FALSE;
1009 
1011  socket_transport->read_watch))
1012  {
1014  socket_transport->write_watch);
1015  return FALSE;
1016  }
1017 
1018  check_read_watch (transport);
1019  check_write_watch (transport);
1020 
1021  return TRUE;
1022 }
1023 
1031 static void
1032 socket_do_iteration (DBusTransport *transport,
1033  unsigned int flags,
1034  int timeout_milliseconds)
1035 {
1036  DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
1037  DBusPollFD poll_fd;
1038  int poll_res;
1039  int poll_timeout;
1040 
1041  _dbus_verbose (" iteration flags = %s%s timeout = %d read_watch = %p write_watch = %p fd = %d\n",
1042  flags & DBUS_ITERATION_DO_READING ? "read" : "",
1043  flags & DBUS_ITERATION_DO_WRITING ? "write" : "",
1044  timeout_milliseconds,
1045  socket_transport->read_watch,
1046  socket_transport->write_watch,
1047  socket_transport->fd);
1048 
1049  /* the passed in DO_READING/DO_WRITING flags indicate whether to
1050  * read/write messages, but regardless of those we may need to block
1051  * for reading/writing to do auth. But if we do reading for auth,
1052  * we don't want to read any messages yet if not given DO_READING.
1053  */
1054 
1055  poll_fd.fd = socket_transport->fd;
1056  poll_fd.events = 0;
1057 
1058  if (_dbus_transport_get_is_authenticated (transport))
1059  {
1060  /* This is kind of a hack; if we have stuff to write, then try
1061  * to avoid the poll. This is probably about a 5% speedup on an
1062  * echo client/server.
1063  *
1064  * If both reading and writing were requested, we want to avoid this
1065  * since it could have funky effects:
1066  * - both ends spinning waiting for the other one to read
1067  * data so they can finish writing
1068  * - prioritizing all writing ahead of reading
1069  */
1070  if ((flags & DBUS_ITERATION_DO_WRITING) &&
1071  !(flags & (DBUS_ITERATION_DO_READING | DBUS_ITERATION_BLOCK)) &&
1072  !transport->disconnected &&
1074  {
1075  do_writing (transport);
1076 
1077  if (transport->disconnected ||
1079  goto out;
1080  }
1081 
1082  /* If we get here, we decided to do the poll() after all */
1083  _dbus_assert (socket_transport->read_watch);
1084  if (flags & DBUS_ITERATION_DO_READING)
1085  poll_fd.events |= _DBUS_POLLIN;
1086 
1087  _dbus_assert (socket_transport->write_watch);
1088  if (flags & DBUS_ITERATION_DO_WRITING)
1089  poll_fd.events |= _DBUS_POLLOUT;
1090  }
1091  else
1092  {
1093  DBusAuthState auth_state;
1094 
1095  auth_state = _dbus_auth_do_work (transport->auth);
1096 
1097  if (transport->receive_credentials_pending ||
1098  auth_state == DBUS_AUTH_STATE_WAITING_FOR_INPUT)
1099  poll_fd.events |= _DBUS_POLLIN;
1100 
1101  if (transport->send_credentials_pending ||
1102  auth_state == DBUS_AUTH_STATE_HAVE_BYTES_TO_SEND)
1103  poll_fd.events |= _DBUS_POLLOUT;
1104  }
1105 
1106  if (poll_fd.events)
1107  {
1108  if (flags & DBUS_ITERATION_BLOCK)
1109  poll_timeout = timeout_milliseconds;
1110  else
1111  poll_timeout = 0;
1112 
1113  /* For blocking selects we drop the connection lock here
1114  * to avoid blocking out connection access during a potentially
1115  * indefinite blocking call. The io path is still protected
1116  * by the io_path_cond condvar, so we won't reenter this.
1117  */
1118  if (flags & DBUS_ITERATION_BLOCK)
1119  {
1120  _dbus_verbose ("unlock pre poll\n");
1121  _dbus_connection_unlock (transport->connection);
1122  }
1123 
1124  again:
1125  poll_res = _dbus_poll (&poll_fd, 1, poll_timeout);
1126 
1127  if (poll_res < 0 && _dbus_get_is_errno_eintr ())
1128  goto again;
1129 
1130  if (flags & DBUS_ITERATION_BLOCK)
1131  {
1132  _dbus_verbose ("lock post poll\n");
1133  _dbus_connection_lock (transport->connection);
1134  }
1135 
1136  if (poll_res >= 0)
1137  {
1138  if (poll_res == 0)
1139  poll_fd.revents = 0; /* some concern that posix does not guarantee this;
1140  * valgrind flags it as an error. though it probably
1141  * is guaranteed on linux at least.
1142  */
1143 
1144  if (poll_fd.revents & _DBUS_POLLERR)
1145  do_io_error (transport);
1146  else
1147  {
1148  dbus_bool_t need_read = (poll_fd.revents & _DBUS_POLLIN) > 0;
1149  dbus_bool_t need_write = (poll_fd.revents & _DBUS_POLLOUT) > 0;
1150  dbus_bool_t authentication_completed;
1151 
1152  _dbus_verbose ("in iteration, need_read=%d need_write=%d\n",
1153  need_read, need_write);
1154  do_authentication (transport, need_read, need_write,
1155  &authentication_completed);
1156 
1157  /* See comment in socket_handle_watch. */
1158  if (authentication_completed)
1159  goto out;
1160 
1161  if (need_read && (flags & DBUS_ITERATION_DO_READING))
1162  do_reading (transport);
1163  if (need_write && (flags & DBUS_ITERATION_DO_WRITING))
1164  do_writing (transport);
1165  }
1166  }
1167  else
1168  {
1169  _dbus_verbose ("Error from _dbus_poll(): %s\n",
1171  }
1172  }
1173 
1174 
1175  out:
1176  /* We need to install the write watch only if we did not
1177  * successfully write everything. Note we need to be careful that we
1178  * don't call check_write_watch *before* do_writing, since it's
1179  * inefficient to add the write watch, and we can avoid it most of
1180  * the time since we can write immediately.
1181  *
1182  * However, we MUST always call check_write_watch(); DBusConnection code
1183  * relies on the fact that running an iteration will notice that
1184  * messages are pending.
1185  */
1186  check_write_watch (transport);
1187 
1188  _dbus_verbose (" ... leaving do_iteration()\n");
1189 }
1190 
1191 static void
1192 socket_live_messages_changed (DBusTransport *transport)
1193 {
1194  /* See if we should look for incoming messages again */
1195  check_read_watch (transport);
1196 }
1197 
1198 
1199 static dbus_bool_t
1200 socket_get_socket_fd (DBusTransport *transport,
1201  int *fd_p)
1202 {
1203  DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
1204 
1205  *fd_p = socket_transport->fd;
1206 
1207  return TRUE;
1208 }
1209 
1210 static const DBusTransportVTable socket_vtable = {
1211  socket_finalize,
1212  socket_handle_watch,
1213  socket_disconnect,
1214  socket_connection_set,
1215  socket_do_iteration,
1216  socket_live_messages_changed,
1217  socket_get_socket_fd
1218 };
1219 
1233  const DBusString *server_guid,
1234  const DBusString *address)
1235 {
1236  DBusTransportSocket *socket_transport;
1237 
1238  socket_transport = dbus_new0 (DBusTransportSocket, 1);
1239  if (socket_transport == NULL)
1240  return NULL;
1241 
1242  if (!_dbus_string_init (&socket_transport->encoded_outgoing))
1243  goto failed_0;
1244 
1245  if (!_dbus_string_init (&socket_transport->encoded_incoming))
1246  goto failed_1;
1247 
1248  socket_transport->write_watch = _dbus_watch_new (fd,
1249  DBUS_WATCH_WRITABLE,
1250  FALSE,
1251  NULL, NULL, NULL);
1252  if (socket_transport->write_watch == NULL)
1253  goto failed_2;
1254 
1255  socket_transport->read_watch = _dbus_watch_new (fd,
1256  DBUS_WATCH_READABLE,
1257  FALSE,
1258  NULL, NULL, NULL);
1259  if (socket_transport->read_watch == NULL)
1260  goto failed_3;
1261 
1262  if (!_dbus_transport_init_base (&socket_transport->base,
1263  &socket_vtable,
1264  server_guid, address))
1265  goto failed_4;
1266 
1267 #ifdef HAVE_UNIX_FD_PASSING
1269 #endif
1270 
1271  socket_transport->fd = fd;
1272  socket_transport->message_bytes_written = 0;
1273 
1274  /* These values should probably be tunable or something. */
1275  socket_transport->max_bytes_read_per_iteration = 2048;
1276  socket_transport->max_bytes_written_per_iteration = 2048;
1277 
1278  return (DBusTransport*) socket_transport;
1279 
1280  failed_4:
1281  _dbus_watch_invalidate (socket_transport->read_watch);
1282  _dbus_watch_unref (socket_transport->read_watch);
1283  failed_3:
1284  _dbus_watch_invalidate (socket_transport->write_watch);
1285  _dbus_watch_unref (socket_transport->write_watch);
1286  failed_2:
1287  _dbus_string_free (&socket_transport->encoded_incoming);
1288  failed_1:
1289  _dbus_string_free (&socket_transport->encoded_outgoing);
1290  failed_0:
1291  dbus_free (socket_transport);
1292  return NULL;
1293 }
1294 
1308  const char *port,
1309  const char *family,
1310  const char *noncefile,
1311  DBusError *error)
1312 {
1313  int fd;
1314  DBusTransport *transport;
1315  DBusString address;
1316 
1317  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1318 
1319  if (!_dbus_string_init (&address))
1320  {
1322  return NULL;
1323  }
1324 
1325  if (host == NULL)
1326  host = "localhost";
1327 
1328  if (!_dbus_string_append (&address, noncefile ? "nonce-tcp:" : "tcp:"))
1329  goto error;
1330 
1331  if (!_dbus_string_append (&address, "host=") ||
1332  !_dbus_string_append (&address, host))
1333  goto error;
1334 
1335  if (!_dbus_string_append (&address, ",port=") ||
1336  !_dbus_string_append (&address, port))
1337  goto error;
1338 
1339  if (family != NULL &&
1340  (!_dbus_string_append (&address, ",family=") ||
1341  !_dbus_string_append (&address, family)))
1342  goto error;
1343 
1344  if (noncefile != NULL &&
1345  (!_dbus_string_append (&address, ",noncefile=") ||
1346  !_dbus_string_append (&address, noncefile)))
1347  goto error;
1348 
1349  fd = _dbus_connect_tcp_socket_with_nonce (host, port, family, noncefile, error);
1350  if (fd < 0)
1351  {
1352  _DBUS_ASSERT_ERROR_IS_SET (error);
1353  _dbus_string_free (&address);
1354  return NULL;
1355  }
1356 
1357  _dbus_verbose ("Successfully connected to tcp socket %s:%s\n",
1358  host, port);
1359 
1360  transport = _dbus_transport_new_for_socket (fd, NULL, &address);
1361  _dbus_string_free (&address);
1362  if (transport == NULL)
1363  {
1365  _dbus_close_socket (fd, NULL);
1366  fd = -1;
1367  }
1368 
1369  return transport;
1370 
1371 error:
1372  _dbus_string_free (&address);
1374  return NULL;
1375 }
1376 
1385 DBusTransportOpenResult
1387  DBusTransport **transport_p,
1388  DBusError *error)
1389 {
1390  const char *method;
1391  dbus_bool_t isTcp;
1392  dbus_bool_t isNonceTcp;
1393 
1394  method = dbus_address_entry_get_method (entry);
1395  _dbus_assert (method != NULL);
1396 
1397  isTcp = strcmp (method, "tcp") == 0;
1398  isNonceTcp = strcmp (method, "nonce-tcp") == 0;
1399 
1400  if (isTcp || isNonceTcp)
1401  {
1402  const char *host = dbus_address_entry_get_value (entry, "host");
1403  const char *port = dbus_address_entry_get_value (entry, "port");
1404  const char *family = dbus_address_entry_get_value (entry, "family");
1405  const char *noncefile = dbus_address_entry_get_value (entry, "noncefile");
1406 
1407  if ((isNonceTcp == TRUE) != (noncefile != NULL)) {
1408  _dbus_set_bad_address (error, method, "noncefile", NULL);
1409  return DBUS_TRANSPORT_OPEN_BAD_ADDRESS;
1410  }
1411 
1412  if (port == NULL)
1413  {
1414  _dbus_set_bad_address (error, method, "port", NULL);
1415  return DBUS_TRANSPORT_OPEN_BAD_ADDRESS;
1416  }
1417 
1418  *transport_p = _dbus_transport_new_for_tcp_socket (host, port, family, noncefile, error);
1419  if (*transport_p == NULL)
1420  {
1421  _DBUS_ASSERT_ERROR_IS_SET (error);
1422  return DBUS_TRANSPORT_OPEN_DID_NOT_CONNECT;
1423  }
1424  else
1425  {
1426  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1427  return DBUS_TRANSPORT_OPEN_OK;
1428  }
1429  }
1430  else
1431  {
1432  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1433  return DBUS_TRANSPORT_OPEN_NOT_HANDLED;
1434  }
1435 }
1436 
Implementation details of DBusTransportSocket.
dbus_bool_t _dbus_string_append(DBusString *str, const char *buffer)
Appends a nul-terminated C-style string to a DBusString.
Definition: dbus-string.c:913
void dbus_message_lock(DBusMessage *message)
Locks a message.
Definition: dbus-message.c:383
DBusTransport base
Parent instance.
void _dbus_connection_toggle_watch_unlocked(DBusConnection *connection, DBusWatch *watch, dbus_bool_t enabled)
Toggles a watch and notifies app via connection&#39;s DBusWatchToggledFunction if available.
long max_live_messages_unix_fds
Max total unix fds of received messages.
const char * message
public error message field
Definition: dbus-errors.h:51
Implementation of DBusWatch.
Definition: dbus-watch.c:40
DBusTransport * _dbus_transport_new_for_tcp_socket(const char *host, const char *port, const char *family, const char *noncefile, DBusError *error)
Creates a new transport for the given hostname and port.
#define NULL
A null pointer, defined appropriately for C or C++.
int fd
File descriptor.
DBusAuth * auth
Authentication conversation.
unsigned int disconnected
TRUE if we are disconnected.
void dbus_free(void *memory)
Frees a block of memory previously allocated by dbus_malloc() or dbus_malloc0().
Definition: dbus-memory.c:700
void _dbus_message_loader_return_unix_fds(DBusMessageLoader *loader, int *fds, unsigned n_fds)
Returns a buffer obtained from _dbus_message_loader_get_unix_fds().
dbus_bool_t _dbus_socket_can_pass_unix_fd(int fd)
Checks whether file descriptors may be passed via the socket.
dbus_bool_t _dbus_auth_needs_decoding(DBusAuth *auth)
Called post-authentication, indicates whether we need to decode the message stream with _dbus_auth_de...
Definition: dbus-auth.c:2660
void _dbus_watch_invalidate(DBusWatch *watch)
Clears the file descriptor from a now-invalid watch object so that no one tries to use it...
Definition: dbus-watch.c:169
long max_live_messages_size
Max total size of received messages.
void _dbus_connection_lock(DBusConnection *connection)
Acquires the connection lock.
dbus_bool_t _dbus_auth_encode_data(DBusAuth *auth, const DBusString *plaintext, DBusString *encoded)
Called post-authentication, encodes a block of bytes for sending to the peer.
Definition: dbus-auth.c:2628
DBUS_EXPORT dbus_bool_t dbus_watch_get_enabled(DBusWatch *watch)
Returns whether a watch is enabled or not.
Definition: dbus-watch.c:645
#define _dbus_assert(condition)
Aborts with an error message if the condition is false.
int _dbus_write_socket_two(int fd, const DBusString *buffer1, int start1, int len1, const DBusString *buffer2, int start2, int len2)
Like _dbus_write_two() but only works on sockets and is thus available on Windows.
#define DBUS_ERROR_INIT
Expands to a suitable initializer for a DBusError on the stack.
Definition: dbus-errors.h:62
const char * dbus_address_entry_get_method(DBusAddressEntry *entry)
Returns the method string of an address entry.
Definition: dbus-address.c:227
DBusTransportOpenResult _dbus_transport_open_socket(DBusAddressEntry *entry, DBusTransport **transport_p, DBusError *error)
Opens a TCP socket transport.
dbus_bool_t _dbus_transport_queue_messages(DBusTransport *transport)
Processes data we&#39;ve read while handling a watch, potentially converting some of it to messages and q...
DBusAuthState _dbus_auth_do_work(DBusAuth *auth)
Analyzes buffered input and moves the auth conversation forward, returning the new state of the auth ...
Definition: dbus-auth.c:2439
void dbus_error_free(DBusError *error)
Frees an error that&#39;s been set (or just initialized), then reinitializes the error as in dbus_error_i...
Definition: dbus-errors.c:211
int _dbus_read_socket_with_unix_fds(int fd, DBusString *buffer, int count, int *fds, int *n_fds)
Like _dbus_read_socket() but also tries to read unix fds from the socket.
A portable struct pollfd wrapper.
Definition: dbus-sysdeps.h:299
int max_bytes_written_per_iteration
To avoid blocking too long.
DBusConnection * connection
Connection owning this transport.
#define _DBUS_POLLIN
There is data to read.
Definition: dbus-sysdeps.h:283
unsigned int send_credentials_pending
TRUE if we need to send credentials
dbus_bool_t _dbus_string_init(DBusString *str)
Initializes a string.
Definition: dbus-string.c:175
DBusTransport * _dbus_transport_new_for_socket(int fd, const DBusString *server_guid, const DBusString *address)
Creates a new transport for the given socket file descriptor.
DBusMessage * _dbus_connection_get_message_to_send(DBusConnection *connection)
Gets the next outgoing message.
short events
Events to poll for.
Definition: dbus-sysdeps.h:302
dbus_bool_t _dbus_read_credentials_socket(int client_fd, DBusCredentials *credentials, DBusError *error)
Reads a single byte which must be nul (an error occurs otherwise), and reads unix credentials if avai...
DBusString encoded_incoming
Encoded version of current incoming data.
dbus_bool_t _dbus_transport_get_is_connected(DBusTransport *transport)
Returns TRUE if the transport has not been disconnected.
dbus_bool_t _dbus_transport_init_base(DBusTransport *transport, const DBusTransportVTable *vtable, const DBusString *server_guid, const DBusString *address)
Initializes the base class members of DBusTransport.
void _dbus_auth_get_buffer(DBusAuth *auth, DBusString **buffer)
Get a buffer to be used for reading bytes from the peer we&#39;re conversing with.
Definition: dbus-auth.c:2528
Internals of DBusMessage.
dbus_bool_t _dbus_auth_decode_data(DBusAuth *auth, const DBusString *encoded, DBusString *plaintext)
Called post-authentication, decodes a block of bytes received from the peer.
Definition: dbus-auth.c:2691
const char * dbus_address_entry_get_value(DBusAddressEntry *entry, const char *key)
Returns a value from a key of an entry.
Definition: dbus-address.c:244
#define dbus_new0(type, count)
Safe macro for using dbus_malloc0().
Definition: dbus-memory.h:59
void _dbus_auth_bytes_sent(DBusAuth *auth, int bytes_sent)
Notifies the auth conversation object that the given number of bytes of the outgoing buffer have been...
Definition: dbus-auth.c:2508
void _dbus_connection_remove_watch_unlocked(DBusConnection *connection, DBusWatch *watch)
Removes a watch using the connection&#39;s DBusRemoveWatchFunction if available.
dbus_bool_t _dbus_string_compact(DBusString *str, int max_waste)
Compacts the string to avoid wasted memory.
Definition: dbus-string.c:367
unsigned int receive_credentials_pending
TRUE if we need to receive credentials
As in POLLOUT.
DBusCounter * live_messages
Counter for size/unix fds of all live messages.
dbus_uint32_t dbus_bool_t
A boolean, valid values are TRUE and FALSE.
Definition: dbus-types.h:35
dbus_bool_t _dbus_connection_has_messages_to_send_unlocked(DBusConnection *connection)
Checks whether there are messages in the outgoing message queue.
DBUS_EXPORT int dbus_watch_get_socket(DBusWatch *watch)
Returns a socket to be watched, on UNIX this will return -1 if our transport is not socket-based so d...
Definition: dbus-watch.c:564
int _dbus_poll(DBusPollFD *fds, int n_fds, int timeout_milliseconds)
Wrapper for poll().
#define _DBUS_POLLOUT
Writing now will not block.
Definition: dbus-sysdeps.h:287
dbus_bool_t _dbus_transport_get_is_authenticated(DBusTransport *transport)
Returns TRUE if we have been authenticated.
Internals of DBusAddressEntry.
Definition: dbus-address.c:43
int _dbus_string_get_length(const DBusString *str)
Gets the length of a string (not including nul termination).
Definition: dbus-string.c:717
int _dbus_read_socket(int fd, DBusString *buffer, int count)
Like _dbus_read(), but only works on sockets so is available on Windows.
DBusWatch * write_watch
Watch for writability.
void _dbus_set_bad_address(DBusError *error, const char *address_problem_type, const char *address_problem_field, const char *address_problem_other)
Sets DBUS_ERROR_BAD_ADDRESS.
Definition: dbus-address.c:65
dbus_bool_t _dbus_connection_handle_watch(DBusWatch *watch, unsigned int condition, void *data)
A callback for use with dbus_watch_new() to create a DBusWatch.
dbus_bool_t _dbus_get_is_errno_enomem(void)
See if errno is ENOMEM.
Definition: dbus-sysdeps.c:737
Object representing an exception.
Definition: dbus-errors.h:48
dbus_bool_t _dbus_send_credentials_socket(int server_fd, DBusError *error)
Sends a single nul byte with our UNIX credentials as ancillary data.
dbus_bool_t _dbus_connection_add_watch_unlocked(DBusConnection *connection, DBusWatch *watch)
Adds a watch using the connection&#39;s DBusAddWatchFunction if available.
void dbus_set_error(DBusError *error, const char *name, const char *format,...)
Assigns an error name and message to a DBusError.
Definition: dbus-errors.c:354
The virtual table that must be implemented to create a new kind of transport.
int message_bytes_written
Number of bytes of current outgoing message that have been written.
void _dbus_connection_message_sent_unlocked(DBusConnection *connection, DBusMessage *message)
Notifies the connection that a message has been sent, so the message can be removed from the outgoing...
int fd
File descriptor.
Definition: dbus-sysdeps.h:301
As in POLLERR (can&#39;t watch for this, but can be present in current state passed to dbus_watch_handle(...
void _dbus_string_free(DBusString *str)
Frees a string created by _dbus_string_init().
Definition: dbus-string.c:242
#define TRUE
Expands to &quot;1&quot;.
DBusMessageLoader * loader
Message-loading buffer.
As in POLLHUP (can&#39;t watch for it, but can be present in current state passed to dbus_watch_handle())...
void _dbus_message_get_network_data(DBusMessage *message, const DBusString **header, const DBusString **body)
Gets the data to be sent over the network for this message.
Definition: dbus-message.c:207
void _dbus_message_loader_return_buffer(DBusMessageLoader *loader, DBusString *buffer, int bytes_read)
Returns a buffer obtained from _dbus_message_loader_get_buffer(), indicating to the loader how many b...
Object representing a transport such as a socket.
dbus_bool_t _dbus_auth_set_credentials(DBusAuth *auth, DBusCredentials *credentials)
Sets credentials received via reliable means from the operating system.
Definition: dbus-auth.c:2723
void _dbus_auth_set_unix_fd_possible(DBusAuth *auth, dbus_bool_t b)
Sets whether unix fd passing is potentially on the transport and hence shall be negotiated.
Definition: dbus-auth.c:2799
const char * _dbus_strerror_from_errno(void)
Get error message from errno.
Definition: dbus-sysdeps.c:767
int _dbus_write_socket(int fd, const DBusString *buffer, int start, int len)
Like _dbus_write(), but only supports sockets and is thus available on Windows.
dbus_bool_t _dbus_get_is_errno_eintr(void)
See if errno is EINTR.
Definition: dbus-sysdeps.c:747
dbus_bool_t _dbus_message_loader_get_unix_fds(DBusMessageLoader *loader, int **fds, unsigned *max_n_fds)
Gets the buffer to use for reading unix fds from the network.
DBusWatch * _dbus_watch_new(int fd, unsigned int flags, dbus_bool_t enabled, DBusWatchHandler handler, void *data, DBusFreeFunction free_data_function)
Creates a new DBusWatch.
Definition: dbus-watch.c:88
DBusTransport * _dbus_transport_ref(DBusTransport *transport)
Increments the reference count for the transport.
void _dbus_message_loader_get_buffer(DBusMessageLoader *loader, DBusString **buffer)
Gets the buffer to use for reading data from the network.
dbus_bool_t _dbus_get_is_errno_eagain_or_ewouldblock(void)
See if errno is EAGAIN or EWOULDBLOCK (this has to be done differently for Winsock so is abstracted) ...
dbus_bool_t _dbus_auth_get_bytes_to_send(DBusAuth *auth, const DBusString **str)
Gets bytes that need to be sent to the peer we&#39;re conversing with.
Definition: dbus-auth.c:2483
DBusWatch * read_watch
Watch for readability.
#define DBUS_ERROR_NO_MEMORY
There was not enough memory to complete an operation.
#define FALSE
Expands to &quot;0&quot;.
DBusCredentials * credentials
Credentials of other end read from the socket.
dbus_bool_t _dbus_string_set_length(DBusString *str, int length)
Sets the length of a string.
Definition: dbus-string.c:780
int max_bytes_read_per_iteration
To avoid blocking too long.
void _dbus_watch_unref(DBusWatch *watch)
Decrements the reference count of a DBusWatch object and finalizes the object if the count reaches ze...
Definition: dbus-watch.c:138
dbus_bool_t _dbus_auth_needs_encoding(DBusAuth *auth)
Called post-authentication, indicates whether we need to encode the message stream with _dbus_auth_en...
Definition: dbus-auth.c:2601
As in POLLIN.
void _dbus_message_get_unix_fds(DBusMessage *message, const int **fds, unsigned *n_fds)
Gets the unix fds to be sent over the network for this message.
Definition: dbus-message.c:226
dbus_bool_t _dbus_close_socket(int fd, DBusError *error)
Closes a socket.
void _dbus_watch_set_handler(DBusWatch *watch, DBusWatchHandler handler, void *data, DBusFreeFunction free_data_function)
Sets the handler for the watch.
Definition: dbus-watch.c:469
void _dbus_transport_disconnect(DBusTransport *transport)
Closes our end of the connection to a remote application.
void _dbus_transport_finalize_base(DBusTransport *transport)
Finalizes base class members of DBusTransport.
void _dbus_connection_unlock(DBusConnection *connection)
Releases the connection lock.
short revents
Events that occurred.
Definition: dbus-sysdeps.h:303
dbus_bool_t _dbus_get_is_errno_epipe(void)
See if errno is EPIPE.
Definition: dbus-sysdeps.c:757
void _dbus_auth_return_buffer(DBusAuth *auth, DBusString *buffer, int bytes_read)
Returns a buffer with new data read into it.
Definition: dbus-auth.c:2547
void _dbus_transport_unref(DBusTransport *transport)
Decrements the reference count for the transport.
long _dbus_counter_get_unix_fd_value(DBusCounter *counter)
Gets the current value of the unix fd counter.
#define _DBUS_POLLERR
Error condition.
Definition: dbus-sysdeps.h:289
DBusString encoded_outgoing
Encoded version of current outgoing message.
long _dbus_counter_get_size_value(DBusCounter *counter)
Gets the current value of the size counter.