D-Bus: dbus-transport-socket.c Source File

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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
44 typedef struct DBusTransportSocket DBusTransportSocket;
45
49 struct DBusTransportSocket
50 {
51 DBusTransport base;
52 int fd;
53 DBusWatch *read_watch;
54 DBusWatch *write_watch;
56 int max_bytes_read_per_iteration;
57 int max_bytes_written_per_iteration;
59 int message_bytes_written;
63 DBusString encoded_outgoing;
66 DBusString encoded_incoming;
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)
81 _dbus_connection_remove_watch_unlocked (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)
91 _dbus_connection_remove_watch_unlocked (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))
139 needed = _dbus_connection_has_messages_to_send_unlocked (transport->connection);
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,
165 _dbus_connection_has_messages_to_send_unlocked (transport->connection));
166
167 _dbus_connection_toggle_watch_unlocked (transport->connection,
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_try_to_authenticate (transport))
194 need_read_watch =
195 (_dbus_counter_get_size_value (transport->live_messages) < transport->max_live_messages_size) &&
196 (_dbus_counter_get_unix_fd_value (transport->live_messages) < transport->max_live_messages_unix_fds);
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);
227 _dbus_connection_toggle_watch_unlocked (transport->connection,
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
260 if (bytes_read > 0)
261 {
262 _dbus_verbose (" read %d bytes in auth phase\n", bytes_read);
263
264 return TRUE;
265 }
266 else if (bytes_read < 0)
267 {
268 /* EINTR already handled for us */
269
270 if (_dbus_get_is_errno_enomem ())
271 {
272 *oom = TRUE;
273 }
274 else if (_dbus_get_is_errno_eagain_or_ewouldblock ())
275 ; /* do nothing, just return FALSE below */
276 else
277 {
278 _dbus_verbose ("Error reading from remote app: %s\n",
279 _dbus_strerror_from_errno ());
280 do_io_error (transport);
281 }
282
283 return FALSE;
284 }
285 else
286 {
287 _dbus_assert (bytes_read == 0);
288
289 _dbus_verbose ("Disconnected from remote app\n");
290 do_io_error (transport);
291
292 return FALSE;
293 }
294 }
295
296 /* Return value is whether we successfully wrote any bytes */
297 static dbus_bool_t
298 write_data_from_auth (DBusTransport *transport)
299 {
300 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
301 int bytes_written;
302 const DBusString *buffer;
303
304 if (!_dbus_auth_get_bytes_to_send (transport->auth,
305 &buffer))
306 return FALSE;
307
308 bytes_written = _dbus_write_socket (socket_transport->fd,
309 buffer,
310 0, _dbus_string_get_length (buffer));
311
312 if (bytes_written > 0)
313 {
314 _dbus_auth_bytes_sent (transport->auth, bytes_written);
315 return TRUE;
316 }
317 else if (bytes_written < 0)
318 {
319 /* EINTR already handled for us */
320
321 if (_dbus_get_is_errno_eagain_or_ewouldblock ())
322 ;
323 else
324 {
325 _dbus_verbose ("Error writing to remote app: %s\n",
326 _dbus_strerror_from_errno ());
327 do_io_error (transport);
328 }
329 }
330
331 return FALSE;
332 }
333
334 /* FALSE on OOM */
335 static dbus_bool_t
336 exchange_credentials (DBusTransport *transport,
337 dbus_bool_t do_reading,
338 dbus_bool_t do_writing)
339 {
340 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
341 DBusError error = DBUS_ERROR_INIT;
342
343 _dbus_verbose ("exchange_credentials: do_reading = %d, do_writing = %d\n",
344 do_reading, do_writing);
345
346 if (do_writing && transport->send_credentials_pending)
347 {
348 if (_dbus_send_credentials_socket (socket_transport->fd,
349 &error))
350 {
351 transport->send_credentials_pending = FALSE;
352 }
353 else
354 {
355 _dbus_verbose ("Failed to write credentials: %s\n", error.message);
356 dbus_error_free (&error);
357 do_io_error (transport);
358 }
359 }
360
361 if (do_reading && transport->receive_credentials_pending)
362 {
363 /* FIXME this can fail due to IO error _or_ OOM, broken
364 * (somewhat tricky to fix since the OOM error can be set after
365 * we already read the credentials byte, so basically we need to
366 * separate reading the byte and storing it in the
367 * transport->credentials). Does not really matter for now
368 * because storing in credentials never actually fails on unix.
369 */
370 if (_dbus_read_credentials_socket (socket_transport->fd,
371 transport->credentials,
372 &error))
373 {
374 transport->receive_credentials_pending = FALSE;
375 }
376 else
377 {
378 _dbus_verbose ("Failed to read credentials %s\n", error.message);
379 dbus_error_free (&error);
380 do_io_error (transport);
381 }
382 }
383
384 if (!(transport->send_credentials_pending ||
385 transport->receive_credentials_pending))
386 {
387 if (!_dbus_auth_set_credentials (transport->auth,
388 transport->credentials))
389 return FALSE;
390 }
391
392 return TRUE;
393 }
394
395 static dbus_bool_t
396 do_authentication (DBusTransport *transport,
397 dbus_bool_t do_reading,
398 dbus_bool_t do_writing,
399 dbus_bool_t *auth_completed)
400 {
401 dbus_bool_t oom;
402 dbus_bool_t orig_auth_state;
403
404 oom = FALSE;
405
406 orig_auth_state = _dbus_transport_try_to_authenticate (transport);
407
408 /* This is essential to avoid the check_write_watch() at the end,
409 * we don't want to add a write watch in do_iteration before
410 * we try writing and get EAGAIN
411 */
412 if (orig_auth_state)
413 {
414 if (auth_completed)
415 *auth_completed = FALSE;
416 return TRUE;
417 }
418
419 _dbus_transport_ref (transport);
420
421 while (!_dbus_transport_try_to_authenticate (transport) &&
422 _dbus_transport_get_is_connected (transport))
423 {
424 if (!exchange_credentials (transport, do_reading, do_writing))
425 {
426 /* OOM */
427 oom = TRUE;
428 goto out;
429 }
430
431 if (transport->send_credentials_pending ||
432 transport->receive_credentials_pending)
433 {
434 _dbus_verbose ("send_credentials_pending = %d receive_credentials_pending = %d\n",
435 transport->send_credentials_pending,
436 transport->receive_credentials_pending);
437 goto out;
438 }
439
440 #define TRANSPORT_SIDE(t) ((t)->is_server ? "server" : "client")
441 switch (_dbus_auth_do_work (transport->auth))
442 {
443 case DBUS_AUTH_STATE_WAITING_FOR_INPUT:
444 _dbus_verbose (" %s auth state: waiting for input\n",
445 TRANSPORT_SIDE (transport));
446 if (!do_reading || !read_data_into_auth (transport, &oom))
447 goto out;
448 break;
449
450 case DBUS_AUTH_STATE_WAITING_FOR_MEMORY:
451 _dbus_verbose (" %s auth state: waiting for memory\n",
452 TRANSPORT_SIDE (transport));
453 oom = TRUE;
454 goto out;
455 break;
456
457 case DBUS_AUTH_STATE_HAVE_BYTES_TO_SEND:
458 _dbus_verbose (" %s auth state: bytes to send\n",
459 TRANSPORT_SIDE (transport));
460 if (!do_writing || !write_data_from_auth (transport))
461 goto out;
462 break;
463
464 case DBUS_AUTH_STATE_NEED_DISCONNECT:
465 _dbus_verbose (" %s auth state: need to disconnect\n",
466 TRANSPORT_SIDE (transport));
467 do_io_error (transport);
468 break;
469
470 case DBUS_AUTH_STATE_AUTHENTICATED:
471 _dbus_verbose (" %s auth state: authenticated\n",
472 TRANSPORT_SIDE (transport));
473 break;
474 }
475 }
476
477 out:
478 if (auth_completed)
479 *auth_completed = (orig_auth_state != _dbus_transport_try_to_authenticate (transport));
480
481 check_read_watch (transport);
482 check_write_watch (transport);
483 _dbus_transport_unref (transport);
484
485 if (oom)
486 return FALSE;
487 else
488 return TRUE;
489 }
490
491 /* returns false on oom */
492 static dbus_bool_t
493 do_writing (DBusTransport *transport)
494 {
495 int total;
496 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
497 dbus_bool_t oom;
498
499 /* No messages without authentication! */
500 if (!_dbus_transport_try_to_authenticate (transport))
501 {
502 _dbus_verbose ("Not authenticated, not writing anything\n");
503 return TRUE;
504 }
505
506 if (transport->disconnected)
507 {
508 _dbus_verbose ("Not connected, not writing anything\n");
509 return TRUE;
510 }
511
512 #if 1
513 _dbus_verbose ("do_writing(), have_messages = %d, fd = %d\n",
514 _dbus_connection_has_messages_to_send_unlocked (transport->connection),
515 socket_transport->fd);
516 #endif
517
518 oom = FALSE;
519 total = 0;
520
521 while (!transport->disconnected &&
522 _dbus_connection_has_messages_to_send_unlocked (transport->connection))
523 {
524 int bytes_written;
525 DBusMessage *message;
526 const DBusString *header;
527 const DBusString *body;
528 int header_len, body_len;
529 int total_bytes_to_write;
530
531 if (total > socket_transport->max_bytes_written_per_iteration)
532 {
533 _dbus_verbose ("%d bytes exceeds %d bytes written per iteration, returning\n",
534 total, socket_transport->max_bytes_written_per_iteration);
535 goto out;
536 }
537
538 message = _dbus_connection_get_message_to_send (transport->connection);
539 _dbus_assert (message != NULL);
540 dbus_message_lock (message);
541
542 #if 0
543 _dbus_verbose ("writing message %p\n", message);
544 #endif
545
546 _dbus_message_get_network_data (message,
547 &header, &body);
548
549 header_len = _dbus_string_get_length (header);
550 body_len = _dbus_string_get_length (body);
551
552 if (_dbus_auth_needs_encoding (transport->auth))
553 {
554 /* Does fd passing even make sense with encoded data? */
555 _dbus_assert(!DBUS_TRANSPORT_CAN_SEND_UNIX_FD(transport));
556
557 if (_dbus_string_get_length (&socket_transport->encoded_outgoing) == 0)
558 {
559 if (!_dbus_auth_encode_data (transport->auth,
560 header, &socket_transport->encoded_outgoing))
561 {
562 oom = TRUE;
563 goto out;
564 }
565
566 if (!_dbus_auth_encode_data (transport->auth,
567 body, &socket_transport->encoded_outgoing))
568 {
569 _dbus_string_set_length (&socket_transport->encoded_outgoing, 0);
570 oom = TRUE;
571 goto out;
572 }
573 }
574
575 total_bytes_to_write = _dbus_string_get_length (&socket_transport->encoded_outgoing);
576
577 #if 0
578 _dbus_verbose ("encoded message is %d bytes\n",
579 total_bytes_to_write);
580 #endif
581
582 bytes_written =
583 _dbus_write_socket (socket_transport->fd,
584 &socket_transport->encoded_outgoing,
585 socket_transport->message_bytes_written,
586 total_bytes_to_write - socket_transport->message_bytes_written);
587 }
588 else
589 {
590 total_bytes_to_write = header_len + body_len;
591
592 #if 0
593 _dbus_verbose ("message is %d bytes\n",
594 total_bytes_to_write);
595 #endif
596
597 #ifdef HAVE_UNIX_FD_PASSING
598 if (socket_transport->message_bytes_written <= 0 && DBUS_TRANSPORT_CAN_SEND_UNIX_FD(transport))
599 {
600 /* Send the fds along with the first byte of the message */
601 const int *unix_fds;
602 unsigned n;
603
604 _dbus_message_get_unix_fds(message, &unix_fds, &n);
605
606 bytes_written =
607 _dbus_write_socket_with_unix_fds_two (socket_transport->fd,
608 header,
609 socket_transport->message_bytes_written,
610 header_len - socket_transport->message_bytes_written,
611 body,
612 0, body_len,
613 unix_fds,
614 n);
615
616 if (bytes_written > 0 && n > 0)
617 _dbus_verbose("Wrote %i unix fds\n", n);
618 }
619 else
620 #endif
621 {
622 if (socket_transport->message_bytes_written < header_len)
623 {
624 bytes_written =
625 _dbus_write_socket_two (socket_transport->fd,
626 header,
627 socket_transport->message_bytes_written,
628 header_len - socket_transport->message_bytes_written,
629 body,
630 0, body_len);
631 }
632 else
633 {
634 bytes_written =
635 _dbus_write_socket (socket_transport->fd,
636 body,
637 (socket_transport->message_bytes_written - header_len),
638 body_len -
639 (socket_transport->message_bytes_written - header_len));
640 }
641 }
642 }
643
644 if (bytes_written < 0)
645 {
646 /* EINTR already handled for us */
647
648 /* If the other end closed the socket with close() or shutdown(), we
649 * receive EPIPE here but we must not close the socket yet: there
650 * might still be some data to read. See:
651 * http://lists.freedesktop.org/archives/dbus/2008-March/009526.html
652 */
653
654 if (_dbus_get_is_errno_eagain_or_ewouldblock () || _dbus_get_is_errno_epipe ())
655 goto out;
656
657 /* Since Linux commit 25888e (from 2.6.37-rc4, Nov 2010), sendmsg()
658 * on Unix sockets returns -1 errno=ETOOMANYREFS when the passfd
659 * mechanism (SCM_RIGHTS) is used recursively with a recursion level
660 * of maximum 4. The kernel does not have an API to check whether
661 * the passed fds can be forwarded and it can change asynchronously.
662 * See:
663 * https://bugs.freedesktop.org/show_bug.cgi?id=80163
664 */
665
666 else if (_dbus_get_is_errno_etoomanyrefs ())
667 {
668 /* We only send fds in the first byte of the message.
669 * ETOOMANYREFS cannot happen after.
670 */
671 _dbus_assert (socket_transport->message_bytes_written == 0);
672
673 _dbus_verbose (" discard message of %d bytes due to ETOOMANYREFS\n",
674 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
680 /* The message was not actually sent but it needs to be removed
681 * from the outgoing queue
682 */
683 _dbus_connection_message_sent_unlocked (transport->connection,
684 message);
685 }
686 else
687 {
688 _dbus_verbose ("Error writing to remote app: %s\n",
689 _dbus_strerror_from_errno ());
690 do_io_error (transport);
691 goto out;
692 }
693 }
694 else
695 {
696 _dbus_verbose (" wrote %d bytes of %d\n", bytes_written,
697 total_bytes_to_write);
698
699 total += bytes_written;
700 socket_transport->message_bytes_written += bytes_written;
701
702 _dbus_assert (socket_transport->message_bytes_written <=
703 total_bytes_to_write);
704
705 if (socket_transport->message_bytes_written == total_bytes_to_write)
706 {
707 socket_transport->message_bytes_written = 0;
708 _dbus_string_set_length (&socket_transport->encoded_outgoing, 0);
709 _dbus_string_compact (&socket_transport->encoded_outgoing, 2048);
710
711 _dbus_connection_message_sent_unlocked (transport->connection,
712 message);
713 }
714 }
715 }
716
717 out:
718 if (oom)
719 return FALSE;
720 else
721 return TRUE;
722 }
723
724 /* returns false on out-of-memory */
725 static dbus_bool_t
726 do_reading (DBusTransport *transport)
727 {
728 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
729 DBusString *buffer;
730 int bytes_read;
731 int total;
732 dbus_bool_t oom;
733
734 _dbus_verbose ("fd = %d\n",socket_transport->fd);
735
736 /* No messages without authentication! */
737 if (!_dbus_transport_try_to_authenticate (transport))
738 return TRUE;
739
740 oom = FALSE;
741
742 total = 0;
743
744 again:
745
746 /* See if we've exceeded max messages and need to disable reading */
747 check_read_watch (transport);
748
749 if (total > socket_transport->max_bytes_read_per_iteration)
750 {
751 _dbus_verbose ("%d bytes exceeds %d bytes read per iteration, returning\n",
752 total, socket_transport->max_bytes_read_per_iteration);
753 goto out;
754 }
755
756 _dbus_assert (socket_transport->read_watch != NULL ||
757 transport->disconnected);
758
759 if (transport->disconnected)
760 goto out;
761
762 if (!dbus_watch_get_enabled (socket_transport->read_watch))
763 return TRUE;
764
765 if (_dbus_auth_needs_decoding (transport->auth))
766 {
767 /* Does fd passing even make sense with encoded data? */
768 _dbus_assert(!DBUS_TRANSPORT_CAN_SEND_UNIX_FD(transport));
769
770 if (_dbus_string_get_length (&socket_transport->encoded_incoming) > 0)
771 bytes_read = _dbus_string_get_length (&socket_transport->encoded_incoming);
772 else
773 bytes_read = _dbus_read_socket (socket_transport->fd,
774 &socket_transport->encoded_incoming,
775 socket_transport->max_bytes_read_per_iteration);
776
777 _dbus_assert (_dbus_string_get_length (&socket_transport->encoded_incoming) ==
778 bytes_read);
779
780 if (bytes_read > 0)
781 {
782 _dbus_message_loader_get_buffer (transport->loader,
783 &buffer);
784
785 if (!_dbus_auth_decode_data (transport->auth,
786 &socket_transport->encoded_incoming,
787 buffer))
788 {
789 _dbus_verbose ("Out of memory decoding incoming data\n");
790 _dbus_message_loader_return_buffer (transport->loader,
791 buffer);
792
793 oom = TRUE;
794 goto out;
795 }
796
797 _dbus_message_loader_return_buffer (transport->loader,
798 buffer);
799
800 _dbus_string_set_length (&socket_transport->encoded_incoming, 0);
801 _dbus_string_compact (&socket_transport->encoded_incoming, 2048);
802 }
803 }
804 else
805 {
806 _dbus_message_loader_get_buffer (transport->loader,
807 &buffer);
808
809 #ifdef HAVE_UNIX_FD_PASSING
810 if (DBUS_TRANSPORT_CAN_SEND_UNIX_FD(transport))
811 {
812 int *fds, n_fds;
813
814 if (!_dbus_message_loader_get_unix_fds(transport->loader, &fds, &n_fds))
815 {
816 _dbus_verbose ("Out of memory reading file descriptors\n");
817 _dbus_message_loader_return_buffer (transport->loader, buffer);
818 oom = TRUE;
819 goto out;
820 }
821
822 bytes_read = _dbus_read_socket_with_unix_fds(socket_transport->fd,
823 buffer,
824 socket_transport->max_bytes_read_per_iteration,
825 fds, &n_fds);
826
827 if (bytes_read >= 0 && n_fds > 0)
828 _dbus_verbose("Read %i unix fds\n", n_fds);
829
830 _dbus_message_loader_return_unix_fds(transport->loader, fds, bytes_read < 0 ? 0 : n_fds);
831 }
832 else
833 #endif
834 {
835 bytes_read = _dbus_read_socket (socket_transport->fd,
836 buffer, socket_transport->max_bytes_read_per_iteration);
837 }
838
839 _dbus_message_loader_return_buffer (transport->loader,
840 buffer);
841 }
842
843 if (bytes_read < 0)
844 {
845 /* EINTR already handled for us */
846
847 if (_dbus_get_is_errno_enomem ())
848 {
849 _dbus_verbose ("Out of memory in read()/do_reading()\n");
850 oom = TRUE;
851 goto out;
852 }
853 else if (_dbus_get_is_errno_eagain_or_ewouldblock ())
854 goto out;
855 else
856 {
857 _dbus_verbose ("Error reading from remote app: %s\n",
858 _dbus_strerror_from_errno ());
859 do_io_error (transport);
860 goto out;
861 }
862 }
863 else if (bytes_read == 0)
864 {
865 _dbus_verbose ("Disconnected from remote app\n");
866 do_io_error (transport);
867 goto out;
868 }
869 else
870 {
871 _dbus_verbose (" read %d bytes\n", bytes_read);
872
873 total += bytes_read;
874
875 if (!_dbus_transport_queue_messages (transport))
876 {
877 oom = TRUE;
878 _dbus_verbose (" out of memory when queueing messages we just read in the transport\n");
879 goto out;
880 }
881
882 /* Try reading more data until we get EAGAIN and return, or
883 * exceed max bytes per iteration. If in blocking mode of
884 * course we'll block instead of returning.
885 */
886 goto again;
887 }
888
889 out:
890 if (oom)
891 return FALSE;
892 else
893 return TRUE;
894 }
895
896 static dbus_bool_t
897 unix_error_with_read_to_come (DBusTransport *itransport,
898 DBusWatch *watch,
899 unsigned int flags)
900 {
901 DBusTransportSocket *transport = (DBusTransportSocket *) itransport;
902
903 if (!(flags & DBUS_WATCH_HANGUP || flags & DBUS_WATCH_ERROR))
904 return FALSE;
905
906 /* If we have a read watch enabled ...
907 we -might have data incoming ... => handle the HANGUP there */
908 if (watch != transport->read_watch &&
909 _dbus_watch_get_enabled (transport->read_watch))
910 return FALSE;
911
912 return TRUE;
913 }
914
915 static dbus_bool_t
916 socket_handle_watch (DBusTransport *transport,
917 DBusWatch *watch,
918 unsigned int flags)
919 {
920 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
921
922 _dbus_assert (watch == socket_transport->read_watch ||
923 watch == socket_transport->write_watch);
924 _dbus_assert (watch != NULL);
925
926 /* If we hit an error here on a write watch, don't disconnect the transport yet because data can
927 * still be in the buffer and do_reading may need several iteration to read
928 * it all (because of its max_bytes_read_per_iteration limit).
929 */
930 if (!(flags & DBUS_WATCH_READABLE) && unix_error_with_read_to_come (transport, watch, flags))
931 {
932 _dbus_verbose ("Hang up or error on watch\n");
933 _dbus_transport_disconnect (transport);
934 return TRUE;
935 }
936
937 if (watch == socket_transport->read_watch &&
938 (flags & DBUS_WATCH_READABLE))
939 {
940 dbus_bool_t auth_finished;
941 #if 1
942 _dbus_verbose ("handling read watch %p flags = %x\n",
943 watch, flags);
944 #endif
945 if (!do_authentication (transport, TRUE, FALSE, &auth_finished))
946 return FALSE;
947
948 /* We don't want to do a read immediately following
949 * a successful authentication. This is so we
950 * have a chance to propagate the authentication
951 * state further up. Specifically, we need to
952 * process any pending data from the auth object.
953 */
954 if (!auth_finished)
955 {
956 if (!do_reading (transport))
957 {
958 _dbus_verbose ("no memory to read\n");
959 return FALSE;
960 }
961 }
962 else
963 {
964 _dbus_verbose ("Not reading anything since we just completed the authentication\n");
965 }
966 }
967 else if (watch == socket_transport->write_watch &&
968 (flags & DBUS_WATCH_WRITABLE))
969 {
970 #if 1
971 _dbus_verbose ("handling write watch, have_outgoing_messages = %d\n",
972 _dbus_connection_has_messages_to_send_unlocked (transport->connection));
973 #endif
974 if (!do_authentication (transport, FALSE, TRUE, NULL))
975 return FALSE;
976
977 if (!do_writing (transport))
978 {
979 _dbus_verbose ("no memory to write\n");
980 return FALSE;
981 }
982
983 /* See if we still need the write watch */
984 check_write_watch (transport);
985 }
986 #ifdef DBUS_ENABLE_VERBOSE_MODE
987 else
988 {
989 if (watch == socket_transport->read_watch)
990 _dbus_verbose ("asked to handle read watch with non-read condition 0x%x\n",
991 flags);
992 else if (watch == socket_transport->write_watch)
993 _dbus_verbose ("asked to handle write watch with non-write condition 0x%x\n",
994 flags);
995 else
996 _dbus_verbose ("asked to handle watch %p on fd %d that we don't recognize\n",
997 watch, dbus_watch_get_socket (watch));
998 }
999 #endif /* DBUS_ENABLE_VERBOSE_MODE */
1000
1001 return TRUE;
1002 }
1003
1004 static void
1005 socket_disconnect (DBusTransport *transport)
1006 {
1007 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
1008
1009 _dbus_verbose ("\n");
1010
1011 free_watches (transport);
1012
1013 _dbus_close_socket (socket_transport->fd, NULL);
1014 socket_transport->fd = -1;
1015 }
1016
1017 static dbus_bool_t
1018 socket_connection_set (DBusTransport *transport)
1019 {
1020 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
1021
1022 _dbus_watch_set_handler (socket_transport->write_watch,
1023 _dbus_connection_handle_watch,
1024 transport->connection, NULL);
1025
1026 _dbus_watch_set_handler (socket_transport->read_watch,
1027 _dbus_connection_handle_watch,
1028 transport->connection, NULL);
1029
1030 if (!_dbus_connection_add_watch_unlocked (transport->connection,
1031 socket_transport->write_watch))
1032 return FALSE;
1033
1034 if (!_dbus_connection_add_watch_unlocked (transport->connection,
1035 socket_transport->read_watch))
1036 {
1037 _dbus_connection_remove_watch_unlocked (transport->connection,
1038 socket_transport->write_watch);
1039 return FALSE;
1040 }
1041
1042 check_read_watch (transport);
1043 check_write_watch (transport);
1044
1045 return TRUE;
1046 }
1047
1055 static void
1056 socket_do_iteration (DBusTransport *transport,
1057 unsigned int flags,
1058 int timeout_milliseconds)
1059 {
1060 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
1061 DBusPollFD poll_fd;
1062 int poll_res;
1063 int poll_timeout;
1064
1065 _dbus_verbose (" iteration flags = %s%s timeout = %d read_watch = %p write_watch = %p fd = %d\n",
1066 flags & DBUS_ITERATION_DO_READING ? "read" : "",
1067 flags & DBUS_ITERATION_DO_WRITING ? "write" : "",
1068 timeout_milliseconds,
1069 socket_transport->read_watch,
1070 socket_transport->write_watch,
1071 socket_transport->fd);
1072
1073 /* the passed in DO_READING/DO_WRITING flags indicate whether to
1074 * read/write messages, but regardless of those we may need to block
1075 * for reading/writing to do auth. But if we do reading for auth,
1076 * we don't want to read any messages yet if not given DO_READING.
1077 */
1078
1079 poll_fd.fd = socket_transport->fd;
1080 poll_fd.events = 0;
1081
1082 if (_dbus_transport_try_to_authenticate (transport))
1083 {
1084 /* This is kind of a hack; if we have stuff to write, then try
1085 * to avoid the poll. This is probably about a 5% speedup on an
1086 * echo client/server.
1087 *
1088 * If both reading and writing were requested, we want to avoid this
1089 * since it could have funky effects:
1090 * - both ends spinning waiting for the other one to read
1091 * data so they can finish writing
1092 * - prioritizing all writing ahead of reading
1093 */
1094 if ((flags & DBUS_ITERATION_DO_WRITING) &&
1095 !(flags & (DBUS_ITERATION_DO_READING | DBUS_ITERATION_BLOCK)) &&
1096 !transport->disconnected &&
1097 _dbus_connection_has_messages_to_send_unlocked (transport->connection))
1098 {
1099 do_writing (transport);
1100
1101 if (transport->disconnected ||
1102 !_dbus_connection_has_messages_to_send_unlocked (transport->connection))
1103 goto out;
1104 }
1105
1106 /* If we get here, we decided to do the poll() after all */
1107 _dbus_assert (socket_transport->read_watch);
1108 if (flags & DBUS_ITERATION_DO_READING)
1109 poll_fd.events |= _DBUS_POLLIN;
1110
1111 _dbus_assert (socket_transport->write_watch);
1112 if (flags & DBUS_ITERATION_DO_WRITING)
1113 poll_fd.events |= _DBUS_POLLOUT;
1114 }
1115 else
1116 {
1117 DBusAuthState auth_state;
1118
1119 auth_state = _dbus_auth_do_work (transport->auth);
1120
1121 if (transport->receive_credentials_pending ||
1122 auth_state == DBUS_AUTH_STATE_WAITING_FOR_INPUT)
1123 poll_fd.events |= _DBUS_POLLIN;
1124
1125 if (transport->send_credentials_pending ||
1126 auth_state == DBUS_AUTH_STATE_HAVE_BYTES_TO_SEND)
1127 poll_fd.events |= _DBUS_POLLOUT;
1128 }
1129
1130 if (poll_fd.events)
1131 {
1132 if (flags & DBUS_ITERATION_BLOCK)
1133 poll_timeout = timeout_milliseconds;
1134 else
1135 poll_timeout = 0;
1136
1137 /* For blocking selects we drop the connection lock here
1138 * to avoid blocking out connection access during a potentially
1139 * indefinite blocking call. The io path is still protected
1140 * by the io_path_cond condvar, so we won't reenter this.
1141 */
1142 if (flags & DBUS_ITERATION_BLOCK)
1143 {
1144 _dbus_verbose ("unlock pre poll\n");
1145 _dbus_connection_unlock (transport->connection);
1146 }
1147
1148 again:
1149 poll_res = _dbus_poll (&poll_fd, 1, poll_timeout);
1150
1151 if (poll_res < 0 && _dbus_get_is_errno_eintr ())
1152 goto again;
1153
1154 if (flags & DBUS_ITERATION_BLOCK)
1155 {
1156 _dbus_verbose ("lock post poll\n");
1157 _dbus_connection_lock (transport->connection);
1158 }
1159
1160 if (poll_res >= 0)
1161 {
1162 if (poll_res == 0)
1163 poll_fd.revents = 0; /* some concern that posix does not guarantee this;
1164 * valgrind flags it as an error. though it probably
1165 * is guaranteed on linux at least.
1166 */
1167
1168 if (poll_fd.revents & _DBUS_POLLERR)
1169 do_io_error (transport);
1170 else
1171 {
1172 dbus_bool_t need_read = (poll_fd.revents & _DBUS_POLLIN) > 0;
1173 dbus_bool_t need_write = (poll_fd.revents & _DBUS_POLLOUT) > 0;
1174 dbus_bool_t authentication_completed;
1175
1176 _dbus_verbose ("in iteration, need_read=%d need_write=%d\n",
1177 need_read, need_write);
1178 do_authentication (transport, need_read, need_write,
1179 &authentication_completed);
1180
1181 /* See comment in socket_handle_watch. */
1182 if (authentication_completed)
1183 goto out;
1184
1185 if (need_read && (flags & DBUS_ITERATION_DO_READING))
1186 do_reading (transport);
1187 if (need_write && (flags & DBUS_ITERATION_DO_WRITING))
1188 do_writing (transport);
1189 }
1190 }
1191 else
1192 {
1193 _dbus_verbose ("Error from _dbus_poll(): %s\n",
1194 _dbus_strerror_from_errno ());
1195 }
1196 }
1197
1198
1199 out:
1200 /* We need to install the write watch only if we did not
1201 * successfully write everything. Note we need to be careful that we
1202 * don't call check_write_watch *before* do_writing, since it's
1203 * inefficient to add the write watch, and we can avoid it most of
1204 * the time since we can write immediately.
1205 *
1206 * However, we MUST always call check_write_watch(); DBusConnection code
1207 * relies on the fact that running an iteration will notice that
1208 * messages are pending.
1209 */
1210 check_write_watch (transport);
1211
1212 _dbus_verbose (" ... leaving do_iteration()\n");
1213 }
1214
1215 static void
1216 socket_live_messages_changed (DBusTransport *transport)
1217 {
1218 /* See if we should look for incoming messages again */
1219 check_read_watch (transport);
1220 }
1221
1222
1223 static dbus_bool_t
1224 socket_get_socket_fd (DBusTransport *transport,
1225 int *fd_p)
1226 {
1227 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
1228
1229 *fd_p = socket_transport->fd;
1230
1231 return TRUE;
1232 }
1233
1234 static const DBusTransportVTable socket_vtable = {
1235 socket_finalize,
1236 socket_handle_watch,
1237 socket_disconnect,
1238 socket_connection_set,
1239 socket_do_iteration,
1240 socket_live_messages_changed,
1241 socket_get_socket_fd
1242 };
1243
1255 DBusTransport*
1256 _dbus_transport_new_for_socket (int fd,
1257 const DBusString *server_guid,
1258 const DBusString *address)
1259 {
1260 DBusTransportSocket *socket_transport;
1261
1262 socket_transport = dbus_new0 (DBusTransportSocket, 1);
1263 if (socket_transport == NULL)
1264 return NULL;
1265
1266 if (!_dbus_string_init (&socket_transport->encoded_outgoing))
1267 goto failed_0;
1268
1269 if (!_dbus_string_init (&socket_transport->encoded_incoming))
1270 goto failed_1;
1271
1272 socket_transport->write_watch = _dbus_watch_new (fd,
1273 DBUS_WATCH_WRITABLE,
1274 FALSE,
1275 NULL, NULL, NULL);
1276 if (socket_transport->write_watch == NULL)
1277 goto failed_2;
1278
1279 socket_transport->read_watch = _dbus_watch_new (fd,
1280 DBUS_WATCH_READABLE,
1281 FALSE,
1282 NULL, NULL, NULL);
1283 if (socket_transport->read_watch == NULL)
1284 goto failed_3;
1285
1286 if (!_dbus_transport_init_base (&socket_transport->base,
1287 &socket_vtable,
1288 server_guid, address))
1289 goto failed_4;
1290
1291 #ifdef HAVE_UNIX_FD_PASSING
1292 _dbus_auth_set_unix_fd_possible(socket_transport->base.auth, _dbus_socket_can_pass_unix_fd(fd));
1293 #endif
1294
1295 socket_transport->fd = fd;
1296 socket_transport->message_bytes_written = 0;
1297
1298 /* These values should probably be tunable or something. */
1299 socket_transport->max_bytes_read_per_iteration = 2048;
1300 socket_transport->max_bytes_written_per_iteration = 2048;
1301
1302 return (DBusTransport*) socket_transport;
1303
1304 failed_4:
1305 _dbus_watch_invalidate (socket_transport->read_watch);
1306 _dbus_watch_unref (socket_transport->read_watch);
1307 failed_3:
1308 _dbus_watch_invalidate (socket_transport->write_watch);
1309 _dbus_watch_unref (socket_transport->write_watch);
1310 failed_2:
1311 _dbus_string_free (&socket_transport->encoded_incoming);
1312 failed_1:
1313 _dbus_string_free (&socket_transport->encoded_outgoing);
1314 failed_0:
1315 dbus_free (socket_transport);
1316 return NULL;
1317 }
1318
1330 DBusTransport*
1331 _dbus_transport_new_for_tcp_socket (const char *host,
1332 const char *port,
1333 const char *family,
1334 const char *noncefile,
1335 DBusError *error)
1336 {
1337 int fd;
1338 DBusTransport *transport;
1339 DBusString address;
1340
1341 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1342
1343 if (!_dbus_string_init (&address))
1344 {
1345 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1346 return NULL;
1347 }
1348
1349 if (host == NULL)
1350 host = "localhost";
1351
1352 if (!_dbus_string_append (&address, noncefile ? "nonce-tcp:" : "tcp:"))
1353 goto error;
1354
1355 if (!_dbus_string_append (&address, "host=") ||
1356 !_dbus_string_append (&address, host))
1357 goto error;
1358
1359 if (!_dbus_string_append (&address, ",port=") ||
1360 !_dbus_string_append (&address, port))
1361 goto error;
1362
1363 if (family != NULL &&
1364 (!_dbus_string_append (&address, ",family=") ||
1365 !_dbus_string_append (&address, family)))
1366 goto error;
1367
1368 if (noncefile != NULL &&
1369 (!_dbus_string_append (&address, ",noncefile=") ||
1370 !_dbus_string_append (&address, noncefile)))
1371 goto error;
1372
1373 fd = _dbus_connect_tcp_socket_with_nonce (host, port, family, noncefile, error);
1374 if (fd < 0)
1375 {
1376 _DBUS_ASSERT_ERROR_IS_SET (error);
1377 _dbus_string_free (&address);
1378 return NULL;
1379 }
1380
1381 _dbus_verbose ("Successfully connected to tcp socket %s:%s\n",
1382 host, port);
1383
1384 transport = _dbus_transport_new_for_socket (fd, NULL, &address);
1385 _dbus_string_free (&address);
1386 if (transport == NULL)
1387 {
1388 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1389 _dbus_close_socket (fd, NULL);
1390 fd = -1;
1391 }
1392
1393 return transport;
1394
1395 error:
1396 _dbus_string_free (&address);
1397 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1398 return NULL;
1399 }
1400
1409 DBusTransportOpenResult
1410 _dbus_transport_open_socket(DBusAddressEntry *entry,
1411 DBusTransport **transport_p,
1412 DBusError *error)
1413 {
1414 const char *method;
1415 dbus_bool_t isTcp;
1416 dbus_bool_t isNonceTcp;
1417
1418 method = dbus_address_entry_get_method (entry);
1419 _dbus_assert (method != NULL);
1420
1421 isTcp = strcmp (method, "tcp") == 0;
1422 isNonceTcp = strcmp (method, "nonce-tcp") == 0;
1423
1424 if (isTcp || isNonceTcp)
1425 {
1426 const char *host = dbus_address_entry_get_value (entry, "host");
1427 const char *port = dbus_address_entry_get_value (entry, "port");
1428 const char *family = dbus_address_entry_get_value (entry, "family");
1429 const char *noncefile = dbus_address_entry_get_value (entry, "noncefile");
1430
1431 if ((isNonceTcp == TRUE) != (noncefile != NULL)) {
1432 _dbus_set_bad_address (error, method, "noncefile", NULL);
1433 return DBUS_TRANSPORT_OPEN_BAD_ADDRESS;
1434 }
1435
1436 if (port == NULL)
1437 {
1438 _dbus_set_bad_address (error, method, "port", NULL);
1439 return DBUS_TRANSPORT_OPEN_BAD_ADDRESS;
1440 }
1441
1442 *transport_p = _dbus_transport_new_for_tcp_socket (host, port, family, noncefile, error);
1443 if (*transport_p == NULL)
1444 {
1445 _DBUS_ASSERT_ERROR_IS_SET (error);
1446 return DBUS_TRANSPORT_OPEN_DID_NOT_CONNECT;
1447 }
1448 else
1449 {
1450 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1451 return DBUS_TRANSPORT_OPEN_OK;
1452 }
1453 }
1454 else
1455 {
1456 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1457 return DBUS_TRANSPORT_OPEN_NOT_HANDLED;
1458 }
1459 }
1460
DBusTransportSocket
Implementation details of DBusTransportSocket.
Definition: dbus-transport-socket.c:49
_dbus_string_append
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:918
dbus_message_lock
void dbus_message_lock(DBusMessage *message)
Locks a message.
Definition: dbus-message.c:384
DBusTransportSocket::base
DBusTransport base
Parent instance.
Definition: dbus-transport-socket.c:51
_dbus_connection_toggle_watch_unlocked
void _dbus_connection_toggle_watch_unlocked(DBusConnection *connection, DBusWatch *watch, dbus_bool_t enabled)
Toggles a watch and notifies app via connection's DBusWatchToggledFunction if available.
Definition: dbus-connection.c:781
DBusTransport::max_live_messages_unix_fds
long max_live_messages_unix_fds
Max total unix fds of received messages.
Definition: dbus-transport-protected.h:95
DBusError::message
const char * message
public error message field
Definition: dbus-errors.h:51
DBusWatch
Implementation of DBusWatch.
Definition: dbus-watch.c:40
_dbus_transport_new_for_tcp_socket
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.
Definition: dbus-transport-socket.c:1331
NULL
#define NULL
A null pointer, defined appropriately for C or C++.
DBusTransportSocket::fd
int fd
File descriptor.
Definition: dbus-transport-socket.c:52
_dbus_message_loader_return_buffer
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...
Definition: dbus-message.c:3982
DBusTransport::auth
DBusAuth * auth
Authentication conversation.
Definition: dbus-transport-protected.h:90
DBusTransport::disconnected
unsigned int disconnected
TRUE if we are disconnected.
Definition: dbus-transport-protected.h:113
dbus_free
void dbus_free(void *memory)
Frees a block of memory previously allocated by dbus_malloc() or dbus_malloc0().
Definition: dbus-memory.c:701
_dbus_message_loader_return_unix_fds
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().
Definition: dbus-message.c:4051
_dbus_socket_can_pass_unix_fd
dbus_bool_t _dbus_socket_can_pass_unix_fd(int fd)
Checks whether file descriptors may be passed via the socket.
Definition: dbus-sysdeps-unix.c:3954
_dbus_auth_needs_decoding
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:2650
_dbus_watch_invalidate
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
DBusTransport::max_live_messages_size
long max_live_messages_size
Max total size of received messages.
Definition: dbus-transport-protected.h:94
_dbus_connection_lock
void _dbus_connection_lock(DBusConnection *connection)
Acquires the connection lock.
Definition: dbus-connection.c:388
_dbus_auth_encode_data
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:2618
dbus_watch_get_enabled
DBUS_EXPORT dbus_bool_t dbus_watch_get_enabled(DBusWatch *watch)
Returns whether a watch is enabled or not.
Definition: dbus-watch.c:667
_dbus_assert
#define _dbus_assert(condition)
Aborts with an error message if the condition is false.
Definition: dbus-internals.h:135
_dbus_write_socket_two
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.
Definition: dbus-sysdeps-unix.c:546
DBUS_ERROR_INIT
#define DBUS_ERROR_INIT
Expands to a suitable initializer for a DBusError on the stack.
Definition: dbus-errors.h:62
dbus_address_entry_get_method
const char * dbus_address_entry_get_method(DBusAddressEntry *entry)
Returns the method string of an address entry.
Definition: dbus-address.c:227
_dbus_transport_open_socket
DBusTransportOpenResult _dbus_transport_open_socket(DBusAddressEntry *entry, DBusTransport **transport_p, DBusError *error)
Opens a TCP socket transport.
Definition: dbus-transport-socket.c:1410
_dbus_transport_queue_messages
dbus_bool_t _dbus_transport_queue_messages(DBusTransport *transport)
Processes data we've read while handling a watch, potentially converting some of it to messages and q...
Definition: dbus-transport.c:1140
_dbus_get_is_errno_etoomanyrefs
dbus_bool_t _dbus_get_is_errno_etoomanyrefs(void)
See if errno is ETOOMANYREFS.
Definition: dbus-sysdeps.c:769
_dbus_auth_return_buffer
void _dbus_auth_return_buffer(DBusAuth *auth, DBusString *buffer)
Returns a buffer with new data read into it.
Definition: dbus-auth.c:2538
_dbus_auth_do_work
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:2431
dbus_error_free
void dbus_error_free(DBusError *error)
Frees an error that's been set (or just initialized), then reinitializes the error as in dbus_error_i...
Definition: dbus-errors.c:211
_dbus_read_socket_with_unix_fds
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.
Definition: dbus-sysdeps-unix.c:273
DBusPollFD
A portable struct pollfd wrapper.
Definition: dbus-sysdeps.h:310
DBusTransportSocket::max_bytes_written_per_iteration
int max_bytes_written_per_iteration
To avoid blocking too long.
Definition: dbus-transport-socket.c:57
DBusTransport::connection
DBusConnection * connection
Connection owning this transport.
Definition: dbus-transport-protected.h:86
_DBUS_POLLIN
#define _DBUS_POLLIN
There is data to read.
Definition: dbus-sysdeps.h:294
DBusTransport::send_credentials_pending
unsigned int send_credentials_pending
TRUE if we need to send credentials
Definition: dbus-transport-protected.h:115
_dbus_string_init
dbus_bool_t _dbus_string_init(DBusString *str)
Initializes a string.
Definition: dbus-string.c:175
_dbus_transport_new_for_socket
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.
Definition: dbus-transport-socket.c:1256
_dbus_connection_get_message_to_send
DBusMessage * _dbus_connection_get_message_to_send(DBusConnection *connection)
Gets the next outgoing message.
Definition: dbus-connection.c:609
DBusPollFD::events
short events
Events to poll for.
Definition: dbus-sysdeps.h:313
_dbus_read_credentials_socket
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...
Definition: dbus-sysdeps-unix.c:1664
DBusTransportSocket::encoded_incoming
DBusString encoded_incoming
Encoded version of current incoming data.
Definition: dbus-transport-socket.c:66
_dbus_transport_get_is_connected
dbus_bool_t _dbus_transport_get_is_connected(DBusTransport *transport)
Returns TRUE if the transport has not been disconnected.
Definition: dbus-transport.c:527
_dbus_transport_init_base
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.
Definition: dbus-transport.c:102
_dbus_auth_get_buffer
void _dbus_auth_get_buffer(DBusAuth *auth, DBusString **buffer)
Get a buffer to be used for reading bytes from the peer we're conversing with.
Definition: dbus-auth.c:2520
DBusMessage
Internals of DBusMessage.
Definition: dbus-message-private.h:99
_dbus_auth_decode_data
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:2681
dbus_address_entry_get_value
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
dbus_new0
#define dbus_new0(type, count)
Safe macro for using dbus_malloc0().
Definition: dbus-memory.h:59
_dbus_auth_bytes_sent
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:2500
_dbus_connection_remove_watch_unlocked
void _dbus_connection_remove_watch_unlocked(DBusConnection *connection, DBusWatch *watch)
Removes a watch using the connection's DBusRemoveWatchFunction if available.
Definition: dbus-connection.c:761
_dbus_string_compact
dbus_bool_t _dbus_string_compact(DBusString *str, int max_waste)
Compacts the string to avoid wasted memory.
Definition: dbus-string.c:372
DBusTransport::receive_credentials_pending
unsigned int receive_credentials_pending
TRUE if we need to receive credentials
Definition: dbus-transport-protected.h:116
DBUS_WATCH_WRITABLE
As in POLLOUT.
Definition: dbus-connection.h:61
DBusString
Definition: dbus-string.h:42
DBusTransport::live_messages
DBusCounter * live_messages
Counter for size/unix fds of all live messages.
Definition: dbus-transport-protected.h:97
dbus_bool_t
dbus_uint32_t dbus_bool_t
A boolean, valid values are TRUE and FALSE.
Definition: dbus-types.h:35
_dbus_connection_has_messages_to_send_unlocked
dbus_bool_t _dbus_connection_has_messages_to_send_unlocked(DBusConnection *connection)
Checks whether there are messages in the outgoing message queue.
Definition: dbus-connection.c:572
dbus_watch_get_socket
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:586
_dbus_poll
int _dbus_poll(DBusPollFD *fds, int n_fds, int timeout_milliseconds)
Wrapper for poll().
Definition: dbus-sysdeps-unix.c:2572
_DBUS_POLLOUT
#define _DBUS_POLLOUT
Writing now will not block.
Definition: dbus-sysdeps.h:298
DBusAddressEntry
Internals of DBusAddressEntry.
Definition: dbus-address.c:43
_dbus_read_socket
int _dbus_read_socket(int fd, DBusString *buffer, int count)
Like _dbus_read(), but only works on sockets so is available on Windows.
Definition: dbus-sysdeps-unix.c:217
DBusTransportSocket::write_watch
DBusWatch * write_watch
Watch for writability.
Definition: dbus-transport-socket.c:54
_dbus_set_bad_address
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_connection_handle_watch
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.
Definition: dbus-connection.c:1486
_dbus_get_is_errno_enomem
dbus_bool_t _dbus_get_is_errno_enomem(void)
See if errno is ENOMEM.
Definition: dbus-sysdeps.c:739
DBusError
Object representing an exception.
Definition: dbus-errors.h:48
_dbus_send_credentials_socket
dbus_bool_t _dbus_send_credentials_socket(int server_fd, DBusError *error)
Sends a single nul byte with our UNIX credentials as ancillary data.
Definition: dbus-sysdeps-unix.c:1946
_dbus_connection_add_watch_unlocked
dbus_bool_t _dbus_connection_add_watch_unlocked(DBusConnection *connection, DBusWatch *watch)
Adds a watch using the connection's DBusAddWatchFunction if available.
Definition: dbus-connection.c:743
dbus_set_error
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
DBusTransportVTable
The virtual table that must be implemented to create a new kind of transport.
Definition: dbus-transport-protected.h:41
DBusTransportSocket::message_bytes_written
int message_bytes_written
Number of bytes of current outgoing message that have been written.
Definition: dbus-transport-socket.c:59
_dbus_connection_message_sent_unlocked
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...
Definition: dbus-connection.c:625
DBusPollFD::fd
int fd
File descriptor.
Definition: dbus-sysdeps.h:312
DBUS_WATCH_ERROR
As in POLLERR (can't watch for this, but can be present in current state passed to dbus_watch_handle(...
Definition: dbus-connection.h:62
_dbus_string_free
void _dbus_string_free(DBusString *str)
Frees a string created by _dbus_string_init().
Definition: dbus-string.c:242
TRUE
#define TRUE
Expands to "1".
DBusTransport::loader
DBusMessageLoader * loader
Message-loading buffer.
Definition: dbus-transport-protected.h:88
DBUS_WATCH_HANGUP
As in POLLHUP (can't watch for it, but can be present in current state passed to dbus_watch_handle())...
Definition: dbus-connection.h:67
_dbus_message_get_network_data
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:208
DBusTransport
Object representing a transport such as a socket.
Definition: dbus-transport-protected.h:80
_dbus_auth_set_credentials
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:2713
_dbus_auth_set_unix_fd_possible
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:2789
_dbus_strerror_from_errno
const char * _dbus_strerror_from_errno(void)
Get error message from errno.
Definition: dbus-sysdeps.c:783
_dbus_write_socket
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.
Definition: dbus-sysdeps-unix.c:235
_dbus_get_is_errno_eintr
dbus_bool_t _dbus_get_is_errno_eintr(void)
See if errno is EINTR.
Definition: dbus-sysdeps.c:749
_dbus_message_loader_get_unix_fds
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.
Definition: dbus-message.c:4002
_dbus_watch_new
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
_dbus_transport_ref
DBusTransport * _dbus_transport_ref(DBusTransport *transport)
Increments the reference count for the transport.
Definition: dbus-transport.c:460
_dbus_transport_try_to_authenticate
dbus_bool_t _dbus_transport_try_to_authenticate(DBusTransport *transport)
Returns TRUE if we have been authenticated.
Definition: dbus-transport.c:724
_dbus_message_loader_get_buffer
void _dbus_message_loader_get_buffer(DBusMessageLoader *loader, DBusString **buffer)
Gets the buffer to use for reading data from the network.
Definition: dbus-message.c:3962
_dbus_get_is_errno_eagain_or_ewouldblock
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) ...
Definition: dbus-sysdeps-unix.c:3913
_dbus_auth_get_bytes_to_send
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're conversing with.
Definition: dbus-auth.c:2475
DBusTransportSocket::read_watch
DBusWatch * read_watch
Watch for readability.
Definition: dbus-transport-socket.c:53
DBUS_ERROR_NO_MEMORY
#define DBUS_ERROR_NO_MEMORY
There was not enough memory to complete an operation.
Definition: dbus-protocol.h:352
FALSE
#define FALSE
Expands to "0".
DBusTransport::credentials
DBusCredentials * credentials
Credentials of other end read from the socket.
Definition: dbus-transport-protected.h:92
_dbus_string_set_length
dbus_bool_t _dbus_string_set_length(DBusString *str, int length)
Sets the length of a string.
Definition: dbus-string.c:785
DBusTransportSocket::max_bytes_read_per_iteration
int max_bytes_read_per_iteration
To avoid blocking too long.
Definition: dbus-transport-socket.c:56
_dbus_watch_unref
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_auth_needs_encoding
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:2591
DBUS_WATCH_READABLE
As in POLLIN.
Definition: dbus-connection.h:60
_dbus_message_get_unix_fds
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:227
_dbus_close_socket
dbus_bool_t _dbus_close_socket(int fd, DBusError *error)
Closes a socket.
Definition: dbus-sysdeps-unix.c:201
_dbus_watch_set_handler
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:491
_dbus_transport_disconnect
void _dbus_transport_disconnect(DBusTransport *transport)
Closes our end of the connection to a remote application.
Definition: dbus-transport.c:502
_dbus_transport_finalize_base
void _dbus_transport_finalize_base(DBusTransport *transport)
Finalizes base class members of DBusTransport.
Definition: dbus-transport.c:216
_dbus_connection_unlock
void _dbus_connection_unlock(DBusConnection *connection)
Releases the connection lock.
Definition: dbus-connection.c:399
DBusPollFD::revents
short revents
Events that occurred.
Definition: dbus-sysdeps.h:314
_dbus_get_is_errno_epipe
dbus_bool_t _dbus_get_is_errno_epipe(void)
See if errno is EPIPE.
Definition: dbus-sysdeps.c:759
_dbus_transport_unref
void _dbus_transport_unref(DBusTransport *transport)
Decrements the reference count for the transport.
Definition: dbus-transport.c:477
_dbus_counter_get_unix_fd_value
long _dbus_counter_get_unix_fd_value(DBusCounter *counter)
Gets the current value of the unix fd counter.
Definition: dbus-resources.c:246
_DBUS_POLLERR
#define _DBUS_POLLERR
Error condition.
Definition: dbus-sysdeps.h:300
DBusTransportSocket::encoded_outgoing
DBusString encoded_outgoing
Encoded version of current outgoing message.
Definition: dbus-transport-socket.c:63
_dbus_counter_get_size_value
long _dbus_counter_get_size_value(DBusCounter *counter)
Gets the current value of the size counter.
Definition: dbus-resources.c:234