D-Bus  1.11.10
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 {
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_try_to_authenticate (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 = %" DBUS_SOCKET_FORMAT " outgoing messages exist %d\n",
163  needed, transport->connection, socket_transport->write_watch,
164  _dbus_socket_printable (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 = %" DBUS_SOCKET_FORMAT "\n",
181  _dbus_socket_printable (socket_transport->fd));
182 
183  if (transport->connection == NULL)
184  return;
185 
186  if (transport->disconnected)
187  {
188  _dbus_assert (socket_transport->read_watch == NULL);
189  return;
190  }
191 
192  _dbus_transport_ref (transport);
193 
194  if (_dbus_transport_try_to_authenticate (transport))
195  need_read_watch =
198  else
199  {
200  if (transport->receive_credentials_pending)
201  need_read_watch = TRUE;
202  else
203  {
204  /* The reason to disable need_read_watch when not WAITING_FOR_INPUT
205  * is to avoid spinning on the file descriptor when we're waiting
206  * to write or for some other part of the auth process
207  */
208  DBusAuthState auth_state;
209 
210  auth_state = _dbus_auth_do_work (transport->auth);
211 
212  /* If we need memory we install the read watch just in case,
213  * if there's no need for it, it will get de-installed
214  * next time we try reading. If we're authenticated we
215  * install it since we normally have it installed while
216  * authenticated.
217  */
218  if (auth_state == DBUS_AUTH_STATE_WAITING_FOR_INPUT ||
219  auth_state == DBUS_AUTH_STATE_WAITING_FOR_MEMORY ||
220  auth_state == DBUS_AUTH_STATE_AUTHENTICATED)
221  need_read_watch = TRUE;
222  else
223  need_read_watch = FALSE;
224  }
225  }
226 
227  _dbus_verbose (" setting read watch enabled = %d\n", need_read_watch);
229  socket_transport->read_watch,
230  need_read_watch);
231 
232  _dbus_transport_unref (transport);
233 }
234 
235 static void
236 do_io_error (DBusTransport *transport)
237 {
238  _dbus_transport_ref (transport);
239  _dbus_transport_disconnect (transport);
240  _dbus_transport_unref (transport);
241 }
242 
243 /* return value is whether we successfully read any new data. */
244 static dbus_bool_t
245 read_data_into_auth (DBusTransport *transport,
246  dbus_bool_t *oom)
247 {
248  DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
249  DBusString *buffer;
250  int bytes_read;
251  int saved_errno;
252 
253  *oom = FALSE;
254 
255  _dbus_auth_get_buffer (transport->auth, &buffer);
256 
257  bytes_read = _dbus_read_socket (socket_transport->fd,
258  buffer, socket_transport->max_bytes_read_per_iteration);
259  saved_errno = _dbus_save_socket_errno ();
260 
261  _dbus_auth_return_buffer (transport->auth, buffer);
262 
263  if (bytes_read > 0)
264  {
265  _dbus_verbose (" read %d bytes in auth phase\n", bytes_read);
266 
267  return TRUE;
268  }
269  else if (bytes_read < 0)
270  {
271  /* EINTR already handled for us */
272 
273  if (_dbus_get_is_errno_enomem (saved_errno))
274  {
275  *oom = TRUE;
276  }
277  else if (_dbus_get_is_errno_eagain_or_ewouldblock (saved_errno))
278  ; /* do nothing, just return FALSE below */
279  else
280  {
281  _dbus_verbose ("Error reading from remote app: %s\n",
282  _dbus_strerror (saved_errno));
283  do_io_error (transport);
284  }
285 
286  return FALSE;
287  }
288  else
289  {
290  _dbus_assert (bytes_read == 0);
291 
292  _dbus_verbose ("Disconnected from remote app\n");
293  do_io_error (transport);
294 
295  return FALSE;
296  }
297 }
298 
299 /* Return value is whether we successfully wrote any bytes */
300 static dbus_bool_t
301 write_data_from_auth (DBusTransport *transport)
302 {
303  DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
304  int bytes_written;
305  int saved_errno;
306  const DBusString *buffer;
307 
308  if (!_dbus_auth_get_bytes_to_send (transport->auth,
309  &buffer))
310  return FALSE;
311 
312  bytes_written = _dbus_write_socket (socket_transport->fd,
313  buffer,
314  0, _dbus_string_get_length (buffer));
315  saved_errno = _dbus_save_socket_errno ();
316 
317  if (bytes_written > 0)
318  {
319  _dbus_auth_bytes_sent (transport->auth, bytes_written);
320  return TRUE;
321  }
322  else if (bytes_written < 0)
323  {
324  /* EINTR already handled for us */
325 
327  ;
328  else
329  {
330  _dbus_verbose ("Error writing to remote app: %s\n",
331  _dbus_strerror (saved_errno));
332  do_io_error (transport);
333  }
334  }
335 
336  return FALSE;
337 }
338 
339 /* FALSE on OOM */
340 static dbus_bool_t
341 exchange_credentials (DBusTransport *transport,
342  dbus_bool_t do_reading,
343  dbus_bool_t do_writing)
344 {
345  DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
346  DBusError error = DBUS_ERROR_INIT;
347 
348  _dbus_verbose ("exchange_credentials: do_reading = %d, do_writing = %d\n",
349  do_reading, do_writing);
350 
351  if (do_writing && transport->send_credentials_pending)
352  {
353  if (_dbus_send_credentials_socket (socket_transport->fd,
354  &error))
355  {
356  transport->send_credentials_pending = FALSE;
357  }
358  else
359  {
360  _dbus_verbose ("Failed to write credentials: %s\n", error.message);
361  dbus_error_free (&error);
362  do_io_error (transport);
363  }
364  }
365 
366  if (do_reading && transport->receive_credentials_pending)
367  {
368  /* FIXME this can fail due to IO error _or_ OOM, broken
369  * (somewhat tricky to fix since the OOM error can be set after
370  * we already read the credentials byte, so basically we need to
371  * separate reading the byte and storing it in the
372  * transport->credentials). Does not really matter for now
373  * because storing in credentials never actually fails on unix.
374  */
375  if (_dbus_read_credentials_socket (socket_transport->fd,
376  transport->credentials,
377  &error))
378  {
379  transport->receive_credentials_pending = FALSE;
380  }
381  else
382  {
383  _dbus_verbose ("Failed to read credentials %s\n", error.message);
384  dbus_error_free (&error);
385  do_io_error (transport);
386  }
387  }
388 
389  if (!(transport->send_credentials_pending ||
390  transport->receive_credentials_pending))
391  {
392  if (!_dbus_auth_set_credentials (transport->auth,
393  transport->credentials))
394  return FALSE;
395  }
396 
397  return TRUE;
398 }
399 
400 static dbus_bool_t
401 do_authentication (DBusTransport *transport,
402  dbus_bool_t do_reading,
403  dbus_bool_t do_writing,
404  dbus_bool_t *auth_completed)
405 {
406  dbus_bool_t oom;
407  dbus_bool_t orig_auth_state;
408 
409  oom = FALSE;
410 
411  orig_auth_state = _dbus_transport_try_to_authenticate (transport);
412 
413  /* This is essential to avoid the check_write_watch() at the end,
414  * we don't want to add a write watch in do_iteration before
415  * we try writing and get EAGAIN
416  */
417  if (orig_auth_state)
418  {
419  if (auth_completed)
420  *auth_completed = FALSE;
421  return TRUE;
422  }
423 
424  _dbus_transport_ref (transport);
425 
426  while (!_dbus_transport_try_to_authenticate (transport) &&
428  {
429  if (!exchange_credentials (transport, do_reading, do_writing))
430  {
431  /* OOM */
432  oom = TRUE;
433  goto out;
434  }
435 
436  if (transport->send_credentials_pending ||
437  transport->receive_credentials_pending)
438  {
439  _dbus_verbose ("send_credentials_pending = %d receive_credentials_pending = %d\n",
440  transport->send_credentials_pending,
441  transport->receive_credentials_pending);
442  goto out;
443  }
444 
445 #define TRANSPORT_SIDE(t) ((t)->is_server ? "server" : "client")
446  switch (_dbus_auth_do_work (transport->auth))
447  {
448  case DBUS_AUTH_STATE_WAITING_FOR_INPUT:
449  _dbus_verbose (" %s auth state: waiting for input\n",
450  TRANSPORT_SIDE (transport));
451  if (!do_reading || !read_data_into_auth (transport, &oom))
452  goto out;
453  break;
454 
455  case DBUS_AUTH_STATE_WAITING_FOR_MEMORY:
456  _dbus_verbose (" %s auth state: waiting for memory\n",
457  TRANSPORT_SIDE (transport));
458  oom = TRUE;
459  goto out;
460  break;
461 
462  case DBUS_AUTH_STATE_HAVE_BYTES_TO_SEND:
463  _dbus_verbose (" %s auth state: bytes to send\n",
464  TRANSPORT_SIDE (transport));
465  if (!do_writing || !write_data_from_auth (transport))
466  goto out;
467  break;
468 
469  case DBUS_AUTH_STATE_NEED_DISCONNECT:
470  _dbus_verbose (" %s auth state: need to disconnect\n",
471  TRANSPORT_SIDE (transport));
472  do_io_error (transport);
473  break;
474 
475  case DBUS_AUTH_STATE_AUTHENTICATED:
476  _dbus_verbose (" %s auth state: authenticated\n",
477  TRANSPORT_SIDE (transport));
478  break;
479  default:
480  _dbus_assert_not_reached ("invalid auth state");
481  }
482  }
483 
484  out:
485  if (auth_completed)
486  *auth_completed = (orig_auth_state != _dbus_transport_try_to_authenticate (transport));
487 
488  check_read_watch (transport);
489  check_write_watch (transport);
490  _dbus_transport_unref (transport);
491 
492  if (oom)
493  return FALSE;
494  else
495  return TRUE;
496 }
497 
498 /* returns false on oom */
499 static dbus_bool_t
500 do_writing (DBusTransport *transport)
501 {
502  int total;
503  DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
504  dbus_bool_t oom;
505 
506  /* No messages without authentication! */
507  if (!_dbus_transport_try_to_authenticate (transport))
508  {
509  _dbus_verbose ("Not authenticated, not writing anything\n");
510  return TRUE;
511  }
512 
513  if (transport->disconnected)
514  {
515  _dbus_verbose ("Not connected, not writing anything\n");
516  return TRUE;
517  }
518 
519 #if 1
520  _dbus_verbose ("do_writing(), have_messages = %d, fd = %" DBUS_SOCKET_FORMAT "\n",
522  _dbus_socket_printable (socket_transport->fd));
523 #endif
524 
525  oom = FALSE;
526  total = 0;
527 
528  while (!transport->disconnected &&
530  {
531  int bytes_written;
532  DBusMessage *message;
533  const DBusString *header;
534  const DBusString *body;
535  int header_len, body_len;
536  int total_bytes_to_write;
537  int saved_errno;
538 
539  if (total > socket_transport->max_bytes_written_per_iteration)
540  {
541  _dbus_verbose ("%d bytes exceeds %d bytes written per iteration, returning\n",
542  total, socket_transport->max_bytes_written_per_iteration);
543  goto out;
544  }
545 
546  message = _dbus_connection_get_message_to_send (transport->connection);
547  _dbus_assert (message != NULL);
548  dbus_message_lock (message);
549 
550 #if 0
551  _dbus_verbose ("writing message %p\n", message);
552 #endif
553 
555  &header, &body);
556 
557  header_len = _dbus_string_get_length (header);
558  body_len = _dbus_string_get_length (body);
559 
560  if (_dbus_auth_needs_encoding (transport->auth))
561  {
562  /* Does fd passing even make sense with encoded data? */
563  _dbus_assert(!DBUS_TRANSPORT_CAN_SEND_UNIX_FD(transport));
564 
565  if (_dbus_string_get_length (&socket_transport->encoded_outgoing) == 0)
566  {
567  if (!_dbus_auth_encode_data (transport->auth,
568  header, &socket_transport->encoded_outgoing))
569  {
570  oom = TRUE;
571  goto out;
572  }
573 
574  if (!_dbus_auth_encode_data (transport->auth,
575  body, &socket_transport->encoded_outgoing))
576  {
577  _dbus_string_set_length (&socket_transport->encoded_outgoing, 0);
578  oom = TRUE;
579  goto out;
580  }
581  }
582 
583  total_bytes_to_write = _dbus_string_get_length (&socket_transport->encoded_outgoing);
584 
585 #if 0
586  _dbus_verbose ("encoded message is %d bytes\n",
587  total_bytes_to_write);
588 #endif
589 
590  bytes_written =
591  _dbus_write_socket (socket_transport->fd,
592  &socket_transport->encoded_outgoing,
593  socket_transport->message_bytes_written,
594  total_bytes_to_write - socket_transport->message_bytes_written);
595  saved_errno = _dbus_save_socket_errno ();
596  }
597  else
598  {
599  total_bytes_to_write = header_len + body_len;
600 
601 #if 0
602  _dbus_verbose ("message is %d bytes\n",
603  total_bytes_to_write);
604 #endif
605 
606 #ifdef HAVE_UNIX_FD_PASSING
607  if (socket_transport->message_bytes_written <= 0 && DBUS_TRANSPORT_CAN_SEND_UNIX_FD(transport))
608  {
609  /* Send the fds along with the first byte of the message */
610  const int *unix_fds;
611  unsigned n;
612 
613  _dbus_message_get_unix_fds(message, &unix_fds, &n);
614 
615  bytes_written =
616  _dbus_write_socket_with_unix_fds_two (socket_transport->fd,
617  header,
618  socket_transport->message_bytes_written,
619  header_len - socket_transport->message_bytes_written,
620  body,
621  0, body_len,
622  unix_fds,
623  n);
624  saved_errno = _dbus_save_socket_errno ();
625 
626  if (bytes_written > 0 && n > 0)
627  _dbus_verbose("Wrote %i unix fds\n", n);
628  }
629  else
630 #endif
631  {
632  if (socket_transport->message_bytes_written < header_len)
633  {
634  bytes_written =
635  _dbus_write_socket_two (socket_transport->fd,
636  header,
637  socket_transport->message_bytes_written,
638  header_len - socket_transport->message_bytes_written,
639  body,
640  0, body_len);
641  }
642  else
643  {
644  bytes_written =
645  _dbus_write_socket (socket_transport->fd,
646  body,
647  (socket_transport->message_bytes_written - header_len),
648  body_len -
649  (socket_transport->message_bytes_written - header_len));
650  }
651 
652  saved_errno = _dbus_save_socket_errno ();
653  }
654  }
655 
656  if (bytes_written < 0)
657  {
658  /* EINTR already handled for us */
659 
660  /* If the other end closed the socket with close() or shutdown(), we
661  * receive EPIPE here but we must not close the socket yet: there
662  * might still be some data to read. See:
663  * http://lists.freedesktop.org/archives/dbus/2008-March/009526.html
664  */
665 
666  if (_dbus_get_is_errno_eagain_or_ewouldblock (saved_errno) || _dbus_get_is_errno_epipe (saved_errno))
667  goto out;
668 
669  /* Since Linux commit 25888e (from 2.6.37-rc4, Nov 2010), sendmsg()
670  * on Unix sockets returns -1 errno=ETOOMANYREFS when the passfd
671  * mechanism (SCM_RIGHTS) is used recursively with a recursion level
672  * of maximum 4. The kernel does not have an API to check whether
673  * the passed fds can be forwarded and it can change asynchronously.
674  * See:
675  * https://bugs.freedesktop.org/show_bug.cgi?id=80163
676  */
677 
678  else if (_dbus_get_is_errno_etoomanyrefs (saved_errno))
679  {
680  /* We only send fds in the first byte of the message.
681  * ETOOMANYREFS cannot happen after.
682  */
683  _dbus_assert (socket_transport->message_bytes_written == 0);
684 
685  _dbus_verbose (" discard message of %d bytes due to ETOOMANYREFS\n",
686  total_bytes_to_write);
687 
688  socket_transport->message_bytes_written = 0;
689  _dbus_string_set_length (&socket_transport->encoded_outgoing, 0);
690  _dbus_string_compact (&socket_transport->encoded_outgoing, 2048);
691 
692  /* The message was not actually sent but it needs to be removed
693  * from the outgoing queue
694  */
696  message);
697  }
698  else
699  {
700  _dbus_verbose ("Error writing to remote app: %s\n",
701  _dbus_strerror (saved_errno));
702  do_io_error (transport);
703  goto out;
704  }
705  }
706  else
707  {
708  _dbus_verbose (" wrote %d bytes of %d\n", bytes_written,
709  total_bytes_to_write);
710 
711  total += bytes_written;
712  socket_transport->message_bytes_written += bytes_written;
713 
714  _dbus_assert (socket_transport->message_bytes_written <=
715  total_bytes_to_write);
716 
717  if (socket_transport->message_bytes_written == total_bytes_to_write)
718  {
719  socket_transport->message_bytes_written = 0;
720  _dbus_string_set_length (&socket_transport->encoded_outgoing, 0);
721  _dbus_string_compact (&socket_transport->encoded_outgoing, 2048);
722 
724  message);
725  }
726  }
727  }
728 
729  out:
730  if (oom)
731  return FALSE;
732  else
733  return TRUE;
734 }
735 
736 /* returns false on out-of-memory */
737 static dbus_bool_t
738 do_reading (DBusTransport *transport)
739 {
740  DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
741  DBusString *buffer;
742  int bytes_read;
743  int total;
744  dbus_bool_t oom;
745  int saved_errno;
746 
747  _dbus_verbose ("fd = %" DBUS_SOCKET_FORMAT "\n",
748  _dbus_socket_printable (socket_transport->fd));
749 
750  /* No messages without authentication! */
751  if (!_dbus_transport_try_to_authenticate (transport))
752  return TRUE;
753 
754  oom = FALSE;
755 
756  total = 0;
757 
758  again:
759 
760  /* See if we've exceeded max messages and need to disable reading */
761  check_read_watch (transport);
762 
763  if (total > socket_transport->max_bytes_read_per_iteration)
764  {
765  _dbus_verbose ("%d bytes exceeds %d bytes read per iteration, returning\n",
766  total, socket_transport->max_bytes_read_per_iteration);
767  goto out;
768  }
769 
770  _dbus_assert (socket_transport->read_watch != NULL ||
771  transport->disconnected);
772 
773  if (transport->disconnected)
774  goto out;
775 
776  if (!dbus_watch_get_enabled (socket_transport->read_watch))
777  return TRUE;
778 
779  if (_dbus_auth_needs_decoding (transport->auth))
780  {
781  /* Does fd passing even make sense with encoded data? */
782  _dbus_assert(!DBUS_TRANSPORT_CAN_SEND_UNIX_FD(transport));
783 
784  if (_dbus_string_get_length (&socket_transport->encoded_incoming) > 0)
785  bytes_read = _dbus_string_get_length (&socket_transport->encoded_incoming);
786  else
787  bytes_read = _dbus_read_socket (socket_transport->fd,
788  &socket_transport->encoded_incoming,
789  socket_transport->max_bytes_read_per_iteration);
790 
791  saved_errno = _dbus_save_socket_errno ();
792 
793  _dbus_assert (_dbus_string_get_length (&socket_transport->encoded_incoming) ==
794  bytes_read);
795 
796  if (bytes_read > 0)
797  {
799  &buffer,
800  NULL,
801  NULL);
802 
803  if (!_dbus_auth_decode_data (transport->auth,
804  &socket_transport->encoded_incoming,
805  buffer))
806  {
807  _dbus_verbose ("Out of memory decoding incoming data\n");
809  buffer);
810 
811  oom = TRUE;
812  goto out;
813  }
814 
816  buffer);
817 
818  _dbus_string_set_length (&socket_transport->encoded_incoming, 0);
819  _dbus_string_compact (&socket_transport->encoded_incoming, 2048);
820  }
821  }
822  else
823  {
824  int max_to_read = DBUS_MAXIMUM_MESSAGE_LENGTH;
825  dbus_bool_t may_read_unix_fds = TRUE;
826 
828  &buffer,
829  &max_to_read,
830  &may_read_unix_fds);
831 
832  if (max_to_read > socket_transport->max_bytes_read_per_iteration)
833  max_to_read = socket_transport->max_bytes_read_per_iteration;
834 
835 #ifdef HAVE_UNIX_FD_PASSING
836  if (DBUS_TRANSPORT_CAN_SEND_UNIX_FD(transport) && may_read_unix_fds)
837  {
838  int *fds;
839  unsigned int n_fds;
840 
841  if (!_dbus_message_loader_get_unix_fds(transport->loader, &fds, &n_fds))
842  {
843  _dbus_verbose ("Out of memory reading file descriptors\n");
844  _dbus_message_loader_return_buffer (transport->loader, buffer);
845  oom = TRUE;
846  goto out;
847  }
848 
849  bytes_read = _dbus_read_socket_with_unix_fds(socket_transport->fd,
850  buffer,
851  max_to_read,
852  fds, &n_fds);
853  saved_errno = _dbus_save_socket_errno ();
854 
855  if (bytes_read >= 0 && n_fds > 0)
856  _dbus_verbose("Read %i unix fds\n", n_fds);
857 
858  _dbus_message_loader_return_unix_fds(transport->loader, fds, bytes_read < 0 ? 0 : n_fds);
859  }
860  else
861 #endif
862  {
863  bytes_read = _dbus_read_socket (socket_transport->fd,
864  buffer, max_to_read);
865  saved_errno = _dbus_save_socket_errno ();
866  }
867 
869  buffer);
870  }
871 
872  if (bytes_read < 0)
873  {
874  /* EINTR already handled for us */
875 
876  if (_dbus_get_is_errno_enomem (saved_errno))
877  {
878  _dbus_verbose ("Out of memory in read()/do_reading()\n");
879  oom = TRUE;
880  goto out;
881  }
882  else if (_dbus_get_is_errno_eagain_or_ewouldblock (saved_errno))
883  goto out;
884  else
885  {
886  _dbus_verbose ("Error reading from remote app: %s\n",
887  _dbus_strerror (saved_errno));
888  do_io_error (transport);
889  goto out;
890  }
891  }
892  else if (bytes_read == 0)
893  {
894  _dbus_verbose ("Disconnected from remote app\n");
895  do_io_error (transport);
896  goto out;
897  }
898  else
899  {
900  _dbus_verbose (" read %d bytes\n", bytes_read);
901 
902  total += bytes_read;
903 
904  if (!_dbus_transport_queue_messages (transport))
905  {
906  oom = TRUE;
907  _dbus_verbose (" out of memory when queueing messages we just read in the transport\n");
908  goto out;
909  }
910 
911  /* Try reading more data until we get EAGAIN and return, or
912  * exceed max bytes per iteration. If in blocking mode of
913  * course we'll block instead of returning.
914  */
915  goto again;
916  }
917 
918  out:
919  if (oom)
920  return FALSE;
921  else
922  return TRUE;
923 }
924 
925 static dbus_bool_t
926 unix_error_with_read_to_come (DBusTransport *itransport,
927  DBusWatch *watch,
928  unsigned int flags)
929 {
930  DBusTransportSocket *transport = (DBusTransportSocket *) itransport;
931 
932  if (!(flags & DBUS_WATCH_HANGUP || flags & DBUS_WATCH_ERROR))
933  return FALSE;
934 
935  /* If we have a read watch enabled ...
936  we -might have data incoming ... => handle the HANGUP there */
937  if (watch != transport->read_watch &&
938  _dbus_watch_get_enabled (transport->read_watch))
939  return FALSE;
940 
941  return TRUE;
942 }
943 
944 static dbus_bool_t
945 socket_handle_watch (DBusTransport *transport,
946  DBusWatch *watch,
947  unsigned int flags)
948 {
949  DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
950 
951  _dbus_assert (watch == socket_transport->read_watch ||
952  watch == socket_transport->write_watch);
953  _dbus_assert (watch != NULL);
954 
955  /* If we hit an error here on a write watch, don't disconnect the transport yet because data can
956  * still be in the buffer and do_reading may need several iteration to read
957  * it all (because of its max_bytes_read_per_iteration limit).
958  */
959  if (!(flags & DBUS_WATCH_READABLE) && unix_error_with_read_to_come (transport, watch, flags))
960  {
961  _dbus_verbose ("Hang up or error on watch\n");
962  _dbus_transport_disconnect (transport);
963  return TRUE;
964  }
965 
966  if (watch == socket_transport->read_watch &&
967  (flags & DBUS_WATCH_READABLE))
968  {
969  dbus_bool_t auth_finished;
970 #if 1
971  _dbus_verbose ("handling read watch %p flags = %x\n",
972  watch, flags);
973 #endif
974  if (!do_authentication (transport, TRUE, FALSE, &auth_finished))
975  return FALSE;
976 
977  /* We don't want to do a read immediately following
978  * a successful authentication. This is so we
979  * have a chance to propagate the authentication
980  * state further up. Specifically, we need to
981  * process any pending data from the auth object.
982  */
983  if (!auth_finished)
984  {
985  if (!do_reading (transport))
986  {
987  _dbus_verbose ("no memory to read\n");
988  return FALSE;
989  }
990  }
991  else
992  {
993  _dbus_verbose ("Not reading anything since we just completed the authentication\n");
994  }
995  }
996  else if (watch == socket_transport->write_watch &&
997  (flags & DBUS_WATCH_WRITABLE))
998  {
999 #if 1
1000  _dbus_verbose ("handling write watch, have_outgoing_messages = %d\n",
1002 #endif
1003  if (!do_authentication (transport, FALSE, TRUE, NULL))
1004  return FALSE;
1005 
1006  if (!do_writing (transport))
1007  {
1008  _dbus_verbose ("no memory to write\n");
1009  return FALSE;
1010  }
1011 
1012  /* See if we still need the write watch */
1013  check_write_watch (transport);
1014  }
1015 #ifdef DBUS_ENABLE_VERBOSE_MODE
1016  else
1017  {
1018  if (watch == socket_transport->read_watch)
1019  _dbus_verbose ("asked to handle read watch with non-read condition 0x%x\n",
1020  flags);
1021  else if (watch == socket_transport->write_watch)
1022  _dbus_verbose ("asked to handle write watch with non-write condition 0x%x\n",
1023  flags);
1024  else
1025  _dbus_verbose ("asked to handle watch %p on fd %" DBUS_SOCKET_FORMAT " that we don't recognize\n",
1026  watch, dbus_watch_get_socket (watch));
1027  }
1028 #endif /* DBUS_ENABLE_VERBOSE_MODE */
1029 
1030  return TRUE;
1031 }
1032 
1033 static void
1034 socket_disconnect (DBusTransport *transport)
1035 {
1036  DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
1037 
1038  _dbus_verbose ("\n");
1039 
1040  free_watches (transport);
1041 
1042  _dbus_close_socket (socket_transport->fd, NULL);
1043  _dbus_socket_invalidate (&socket_transport->fd);
1044 }
1045 
1046 static dbus_bool_t
1047 socket_connection_set (DBusTransport *transport)
1048 {
1049  DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
1050 
1051  _dbus_watch_set_handler (socket_transport->write_watch,
1053  transport->connection, NULL);
1054 
1055  _dbus_watch_set_handler (socket_transport->read_watch,
1057  transport->connection, NULL);
1058 
1060  socket_transport->write_watch))
1061  return FALSE;
1062 
1064  socket_transport->read_watch))
1065  {
1067  socket_transport->write_watch);
1068  return FALSE;
1069  }
1070 
1071  check_read_watch (transport);
1072  check_write_watch (transport);
1073 
1074  return TRUE;
1075 }
1076 
1084 static void
1085 socket_do_iteration (DBusTransport *transport,
1086  unsigned int flags,
1087  int timeout_milliseconds)
1088 {
1089  DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
1090  DBusPollFD poll_fd;
1091  int poll_res;
1092  int poll_timeout;
1093 
1094  _dbus_verbose (" iteration flags = %s%s timeout = %d read_watch = %p write_watch = %p fd = %" DBUS_SOCKET_FORMAT "\n",
1095  flags & DBUS_ITERATION_DO_READING ? "read" : "",
1096  flags & DBUS_ITERATION_DO_WRITING ? "write" : "",
1097  timeout_milliseconds,
1098  socket_transport->read_watch,
1099  socket_transport->write_watch,
1100  _dbus_socket_printable (socket_transport->fd));
1101 
1102  /* the passed in DO_READING/DO_WRITING flags indicate whether to
1103  * read/write messages, but regardless of those we may need to block
1104  * for reading/writing to do auth. But if we do reading for auth,
1105  * we don't want to read any messages yet if not given DO_READING.
1106  */
1107 
1108  poll_fd.fd = _dbus_socket_get_pollable (socket_transport->fd);
1109  poll_fd.events = 0;
1110 
1111  if (_dbus_transport_try_to_authenticate (transport))
1112  {
1113  /* This is kind of a hack; if we have stuff to write, then try
1114  * to avoid the poll. This is probably about a 5% speedup on an
1115  * echo client/server.
1116  *
1117  * If both reading and writing were requested, we want to avoid this
1118  * since it could have funky effects:
1119  * - both ends spinning waiting for the other one to read
1120  * data so they can finish writing
1121  * - prioritizing all writing ahead of reading
1122  */
1123  if ((flags & DBUS_ITERATION_DO_WRITING) &&
1124  !(flags & (DBUS_ITERATION_DO_READING | DBUS_ITERATION_BLOCK)) &&
1125  !transport->disconnected &&
1127  {
1128  do_writing (transport);
1129 
1130  if (transport->disconnected ||
1132  goto out;
1133  }
1134 
1135  /* If we get here, we decided to do the poll() after all */
1136  _dbus_assert (socket_transport->read_watch);
1137  if (flags & DBUS_ITERATION_DO_READING)
1138  poll_fd.events |= _DBUS_POLLIN;
1139 
1140  _dbus_assert (socket_transport->write_watch);
1141  if (flags & DBUS_ITERATION_DO_WRITING)
1142  poll_fd.events |= _DBUS_POLLOUT;
1143  }
1144  else
1145  {
1146  DBusAuthState auth_state;
1147 
1148  auth_state = _dbus_auth_do_work (transport->auth);
1149 
1150  if (transport->receive_credentials_pending ||
1151  auth_state == DBUS_AUTH_STATE_WAITING_FOR_INPUT)
1152  poll_fd.events |= _DBUS_POLLIN;
1153 
1154  if (transport->send_credentials_pending ||
1155  auth_state == DBUS_AUTH_STATE_HAVE_BYTES_TO_SEND)
1156  poll_fd.events |= _DBUS_POLLOUT;
1157  }
1158 
1159  if (poll_fd.events)
1160  {
1161  int saved_errno;
1162 
1163  if (flags & DBUS_ITERATION_BLOCK)
1164  poll_timeout = timeout_milliseconds;
1165  else
1166  poll_timeout = 0;
1167 
1168  /* For blocking selects we drop the connection lock here
1169  * to avoid blocking out connection access during a potentially
1170  * indefinite blocking call. The io path is still protected
1171  * by the io_path_cond condvar, so we won't reenter this.
1172  */
1173  if (flags & DBUS_ITERATION_BLOCK)
1174  {
1175  _dbus_verbose ("unlock pre poll\n");
1176  _dbus_connection_unlock (transport->connection);
1177  }
1178 
1179  again:
1180  poll_res = _dbus_poll (&poll_fd, 1, poll_timeout);
1181  saved_errno = _dbus_save_socket_errno ();
1182 
1183  if (poll_res < 0 && _dbus_get_is_errno_eintr (saved_errno))
1184  goto again;
1185 
1186  if (flags & DBUS_ITERATION_BLOCK)
1187  {
1188  _dbus_verbose ("lock post poll\n");
1189  _dbus_connection_lock (transport->connection);
1190  }
1191 
1192  if (poll_res >= 0)
1193  {
1194  if (poll_res == 0)
1195  poll_fd.revents = 0; /* some concern that posix does not guarantee this;
1196  * valgrind flags it as an error. though it probably
1197  * is guaranteed on linux at least.
1198  */
1199 
1200  if (poll_fd.revents & _DBUS_POLLERR)
1201  do_io_error (transport);
1202  else
1203  {
1204  dbus_bool_t need_read = (poll_fd.revents & _DBUS_POLLIN) > 0;
1205  dbus_bool_t need_write = (poll_fd.revents & _DBUS_POLLOUT) > 0;
1206  dbus_bool_t authentication_completed;
1207 
1208  _dbus_verbose ("in iteration, need_read=%d need_write=%d\n",
1209  need_read, need_write);
1210  do_authentication (transport, need_read, need_write,
1211  &authentication_completed);
1212 
1213  /* See comment in socket_handle_watch. */
1214  if (authentication_completed)
1215  goto out;
1216 
1217  if (need_read && (flags & DBUS_ITERATION_DO_READING))
1218  do_reading (transport);
1219  if (need_write && (flags & DBUS_ITERATION_DO_WRITING))
1220  do_writing (transport);
1221  }
1222  }
1223  else
1224  {
1225  _dbus_verbose ("Error from _dbus_poll(): %s\n",
1226  _dbus_strerror (saved_errno));
1227  }
1228  }
1229 
1230 
1231  out:
1232  /* We need to install the write watch only if we did not
1233  * successfully write everything. Note we need to be careful that we
1234  * don't call check_write_watch *before* do_writing, since it's
1235  * inefficient to add the write watch, and we can avoid it most of
1236  * the time since we can write immediately.
1237  *
1238  * However, we MUST always call check_write_watch(); DBusConnection code
1239  * relies on the fact that running an iteration will notice that
1240  * messages are pending.
1241  */
1242  check_write_watch (transport);
1243 
1244  _dbus_verbose (" ... leaving do_iteration()\n");
1245 }
1246 
1247 static void
1248 socket_live_messages_changed (DBusTransport *transport)
1249 {
1250  /* See if we should look for incoming messages again */
1251  check_read_watch (transport);
1252 }
1253 
1254 
1255 static dbus_bool_t
1256 socket_get_socket_fd (DBusTransport *transport,
1257  DBusSocket *fd_p)
1258 {
1259  DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
1260 
1261  *fd_p = socket_transport->fd;
1262 
1263  return TRUE;
1264 }
1265 
1266 static const DBusTransportVTable socket_vtable = {
1267  socket_finalize,
1268  socket_handle_watch,
1269  socket_disconnect,
1270  socket_connection_set,
1271  socket_do_iteration,
1272  socket_live_messages_changed,
1273  socket_get_socket_fd
1274 };
1275 
1289  const DBusString *server_guid,
1290  const DBusString *address)
1291 {
1292  DBusTransportSocket *socket_transport;
1293 
1294  socket_transport = dbus_new0 (DBusTransportSocket, 1);
1295  if (socket_transport == NULL)
1296  return NULL;
1297 
1298  if (!_dbus_string_init (&socket_transport->encoded_outgoing))
1299  goto failed_0;
1300 
1301  if (!_dbus_string_init (&socket_transport->encoded_incoming))
1302  goto failed_1;
1303 
1304  socket_transport->write_watch = _dbus_watch_new (_dbus_socket_get_pollable (fd),
1306  FALSE,
1307  NULL, NULL, NULL);
1308  if (socket_transport->write_watch == NULL)
1309  goto failed_2;
1310 
1311  socket_transport->read_watch = _dbus_watch_new (_dbus_socket_get_pollable (fd),
1313  FALSE,
1314  NULL, NULL, NULL);
1315  if (socket_transport->read_watch == NULL)
1316  goto failed_3;
1317 
1318  if (!_dbus_transport_init_base (&socket_transport->base,
1319  &socket_vtable,
1320  server_guid, address))
1321  goto failed_4;
1322 
1323 #ifdef HAVE_UNIX_FD_PASSING
1325 #endif
1326 
1327  socket_transport->fd = fd;
1328  socket_transport->message_bytes_written = 0;
1329 
1330  /* These values should probably be tunable or something. */
1331  socket_transport->max_bytes_read_per_iteration = 2048;
1332  socket_transport->max_bytes_written_per_iteration = 2048;
1333 
1334  return (DBusTransport*) socket_transport;
1335 
1336  failed_4:
1337  _dbus_watch_invalidate (socket_transport->read_watch);
1338  _dbus_watch_unref (socket_transport->read_watch);
1339  failed_3:
1340  _dbus_watch_invalidate (socket_transport->write_watch);
1341  _dbus_watch_unref (socket_transport->write_watch);
1342  failed_2:
1343  _dbus_string_free (&socket_transport->encoded_incoming);
1344  failed_1:
1345  _dbus_string_free (&socket_transport->encoded_outgoing);
1346  failed_0:
1347  dbus_free (socket_transport);
1348  return NULL;
1349 }
1350 
1364  const char *port,
1365  const char *family,
1366  const char *noncefile,
1367  DBusError *error)
1368 {
1369  DBusSocket fd;
1370  DBusTransport *transport;
1371  DBusString address;
1372 
1373  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1374 
1375  if (!_dbus_string_init (&address))
1376  {
1378  return NULL;
1379  }
1380 
1381  if (host == NULL)
1382  host = "localhost";
1383 
1384  if (!_dbus_string_append (&address, noncefile ? "nonce-tcp:" : "tcp:"))
1385  goto error;
1386 
1387  if (!_dbus_string_append (&address, "host=") ||
1388  !_dbus_string_append (&address, host))
1389  goto error;
1390 
1391  if (!_dbus_string_append (&address, ",port=") ||
1392  !_dbus_string_append (&address, port))
1393  goto error;
1394 
1395  if (family != NULL &&
1396  (!_dbus_string_append (&address, ",family=") ||
1397  !_dbus_string_append (&address, family)))
1398  goto error;
1399 
1400  if (noncefile != NULL &&
1401  (!_dbus_string_append (&address, ",noncefile=") ||
1402  !_dbus_string_append (&address, noncefile)))
1403  goto error;
1404 
1405  fd = _dbus_connect_tcp_socket_with_nonce (host, port, family, noncefile, error);
1406  if (!_dbus_socket_is_valid (fd))
1407  {
1408  _DBUS_ASSERT_ERROR_IS_SET (error);
1409  _dbus_string_free (&address);
1410  return NULL;
1411  }
1412 
1413  _dbus_verbose ("Successfully connected to tcp socket %s:%s\n",
1414  host, port);
1415 
1416  transport = _dbus_transport_new_for_socket (fd, NULL, &address);
1417  _dbus_string_free (&address);
1418  if (transport == NULL)
1419  {
1421  _dbus_close_socket (fd, NULL);
1422  _dbus_socket_invalidate (&fd);
1423  }
1424 
1425  return transport;
1426 
1427 error:
1428  _dbus_string_free (&address);
1430  return NULL;
1431 }
1432 
1441 DBusTransportOpenResult
1443  DBusTransport **transport_p,
1444  DBusError *error)
1445 {
1446  const char *method;
1447  dbus_bool_t isTcp;
1448  dbus_bool_t isNonceTcp;
1449 
1450  method = dbus_address_entry_get_method (entry);
1451  _dbus_assert (method != NULL);
1452 
1453  isTcp = strcmp (method, "tcp") == 0;
1454  isNonceTcp = strcmp (method, "nonce-tcp") == 0;
1455 
1456  if (isTcp || isNonceTcp)
1457  {
1458  const char *host = dbus_address_entry_get_value (entry, "host");
1459  const char *port = dbus_address_entry_get_value (entry, "port");
1460  const char *family = dbus_address_entry_get_value (entry, "family");
1461  const char *noncefile = dbus_address_entry_get_value (entry, "noncefile");
1462 
1463  if ((isNonceTcp == TRUE) != (noncefile != NULL)) {
1464  _dbus_set_bad_address (error, method, "noncefile", NULL);
1465  return DBUS_TRANSPORT_OPEN_BAD_ADDRESS;
1466  }
1467 
1468  if (port == NULL)
1469  {
1470  _dbus_set_bad_address (error, method, "port", NULL);
1471  return DBUS_TRANSPORT_OPEN_BAD_ADDRESS;
1472  }
1473 
1474  *transport_p = _dbus_transport_new_for_tcp_socket (host, port, family, noncefile, error);
1475  if (*transport_p == NULL)
1476  {
1477  _DBUS_ASSERT_ERROR_IS_SET (error);
1478  return DBUS_TRANSPORT_OPEN_DID_NOT_CONNECT;
1479  }
1480  else
1481  {
1482  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1483  return DBUS_TRANSPORT_OPEN_OK;
1484  }
1485  }
1486  else
1487  {
1488  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1489  return DBUS_TRANSPORT_OPEN_NOT_HANDLED;
1490  }
1491 }
1492 
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:935
void dbus_message_lock(DBusMessage *message)
Locks a message.
Definition: dbus-message.c:407
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
DBusWatch * _dbus_watch_new(DBusPollable 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
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++.
DBUS_PRIVATE_EXPORT void _dbus_message_loader_return_buffer(DBusMessageLoader *loader, DBusString *buffer)
Returns a buffer obtained from _dbus_message_loader_get_buffer(), indicating to the loader how many b...
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:702
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:2687
long max_live_messages_size
Max total size of received messages.
DBUS_PRIVATE_EXPORT 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:2655
DBUS_EXPORT dbus_bool_t dbus_watch_get_enabled(DBusWatch *watch)
Returns whether a watch is enabled or not.
Definition: dbus-watch.c:703
#define _dbus_assert(condition)
Aborts with an error message if the condition is false.
#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...
void _dbus_auth_return_buffer(DBusAuth *auth, DBusString *buffer)
Returns a buffer with new data read into it.
Definition: dbus-auth.c:2575
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:2468
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 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:379
unsigned int send_credentials_pending
TRUE if we need to send credentials
int _dbus_read_socket(DBusSocket fd, DBusString *buffer, int count)
Like _dbus_read(), but only works on sockets so is available on Windows.
dbus_bool_t _dbus_string_init(DBusString *str)
Initializes a string.
Definition: dbus-string.c:175
DBusMessage * _dbus_connection_get_message_to_send(DBusConnection *connection)
Gets the next outgoing message.
short events
Events to poll for.
Definition: dbus-sysdeps.h:374
DBusString encoded_incoming
Encoded version of current incoming data.
dbus_bool_t _dbus_send_credentials_socket(DBusSocket server_fd, DBusError *error)
Sends a single nul byte with our UNIX credentials as ancillary data.
dbus_bool_t _dbus_close_socket(DBusSocket fd, DBusError *error)
Closes a socket.
dbus_bool_t _dbus_get_is_errno_etoomanyrefs(int e)
See if errno is ETOOMANYREFS.
Definition: dbus-sysdeps.c:737
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.
Socket interface.
Definition: dbus-sysdeps.h:149
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:2557
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:2718
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
DBusSocket fd
File descriptor.
DBusTransport * _dbus_transport_new_for_socket(DBusSocket fd, const DBusString *server_guid, const DBusString *address)
Creates a new transport for the given socket file descriptor.
dbus_bool_t _dbus_get_is_errno_epipe(int e)
See if errno is EPIPE.
Definition: dbus-sysdeps.c:727
#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:2537
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:389
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_bool_t _dbus_get_is_errno_eagain_or_ewouldblock(int e)
See if errno is EAGAIN or EWOULDBLOCK (this has to be done differently for Winsock so is abstracted) ...
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:594
#define _DBUS_POLLOUT
Writing now will not block.
Definition: dbus-sysdeps.h:383
int _dbus_write_socket_two(DBusSocket 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.
Internals of DBusAddressEntry.
Definition: dbus-address.c:43
dbus_bool_t _dbus_read_credentials_socket(DBusSocket client_fd, DBusCredentials *credentials, DBusError *error)
Reads a single byte which must be nul (an error occurs otherwise), and reads unix credentials if avai...
DBusWatch * write_watch
Watch for writability.
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
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_eintr(int e)
See if errno is EINTR.
Definition: dbus-sysdeps.c:717
Object representing an exception.
Definition: dbus-errors.h:48
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.
int _dbus_read_socket_with_unix_fds(DBusSocket fd, DBusString *buffer, int count, int *fds, unsigned int *n_fds)
Like _dbus_read_socket() but also tries to read unix fds from the socket.
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...
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:259
#define TRUE
Expands to "1".
DBusPollable fd
File descriptor.
Definition: dbus-sysdeps.h:373
#define _dbus_assert_not_reached(explanation)
Aborts with an error message if called.
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:231
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:2750
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:2826
DBusTransport * _dbus_transport_ref(DBusTransport *transport)
Increments the reference count for the transport.
dbus_bool_t _dbus_transport_try_to_authenticate(DBusTransport *transport)
Returns TRUE if we have been authenticated.
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:2512
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
DBusWatch * read_watch
Watch for readability.
#define DBUS_ERROR_NO_MEMORY
There was not enough memory to complete an operation.
#define FALSE
Expands to "0".
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:802
int max_bytes_read_per_iteration
To avoid blocking too long.
int _dbus_write_socket(DBusSocket fd, const DBusString *buffer, int start, int len)
Like _dbus_write(), but only supports sockets and is thus available on Windows.
DBUS_PRIVATE_EXPORT void _dbus_message_loader_get_buffer(DBusMessageLoader *loader, DBusString **buffer, int *max_to_read, dbus_bool_t *may_read_unix_fds)
Gets the buffer to use for reading data from the network.
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:2628
As in POLLIN.
DBUS_PRIVATE_EXPORT 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:250
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:499
void _dbus_transport_disconnect(DBusTransport *transport)
Closes our end of the connection to a remote application.
dbus_bool_t _dbus_socket_can_pass_unix_fd(DBusSocket fd)
Checks whether file descriptors may be passed via the socket.
void _dbus_transport_finalize_base(DBusTransport *transport)
Finalizes base class members of DBusTransport.
int _dbus_poll(DBusPollFD *fds, int n_fds, int timeout_milliseconds)
Wrapper for poll().
DBUS_PRIVATE_EXPORT void _dbus_connection_unlock(DBusConnection *connection)
Releases the connection lock.
short revents
Events that occurred.
Definition: dbus-sysdeps.h:375
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.
dbus_bool_t _dbus_get_is_errno_enomem(int e)
See if errno is ENOMEM.
Definition: dbus-sysdeps.c:707
#define DBUS_MAXIMUM_MESSAGE_LENGTH
The maximum total message size including header and body; similar rationale to max array size...
#define _DBUS_POLLERR
Error condition.
Definition: dbus-sysdeps.h:385
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.