1 /* -*- mode: C; c-file-style: "gnu" -*- */
2 /* dbus-transport-socket.c Socket subclasses of DBusTransport
4 * Copyright (C) 2002, 2003, 2004, 2006 Red Hat Inc.
6 * Licensed under the Academic Free License version 2.1
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.
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.
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 #include "dbus-internals.h"
25 #include "dbus-connection-internal.h"
26 #include "dbus-transport-socket.h"
27 #include "dbus-transport-protected.h"
28 #include "dbus-watch.h"
29 #include "dbus-credentials.h"
33 * @defgroup DBusTransportSocket DBusTransport implementations for sockets
34 * @ingroup DBusInternals
35 * @brief Implementation details of DBusTransport on sockets
41 * Opaque object representing a socket file descriptor transport.
43 typedef struct DBusTransportSocket DBusTransportSocket;
46 * Implementation details of DBusTransportSocket. All members are private.
48 struct DBusTransportSocket
50 DBusTransport base; /**< Parent instance */
51 int fd; /**< File descriptor. */
52 DBusWatch *read_watch; /**< Watch for readability. */
53 DBusWatch *write_watch; /**< Watch for writability. */
55 int max_bytes_read_per_iteration; /**< To avoid blocking too long. */
56 int max_bytes_written_per_iteration; /**< To avoid blocking too long. */
58 int message_bytes_written; /**< Number of bytes of current
59 * outgoing message that have
62 DBusString encoded_outgoing; /**< Encoded version of current
65 DBusString encoded_incoming; /**< Encoded version of current
71 free_watches (DBusTransport *transport)
73 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
75 _dbus_verbose ("%s start\n", _DBUS_FUNCTION_NAME);
77 if (socket_transport->read_watch)
79 if (transport->connection)
80 _dbus_connection_remove_watch_unlocked (transport->connection,
81 socket_transport->read_watch);
82 _dbus_watch_invalidate (socket_transport->read_watch);
83 _dbus_watch_unref (socket_transport->read_watch);
84 socket_transport->read_watch = NULL;
87 if (socket_transport->write_watch)
89 if (transport->connection)
90 _dbus_connection_remove_watch_unlocked (transport->connection,
91 socket_transport->write_watch);
92 _dbus_watch_invalidate (socket_transport->write_watch);
93 _dbus_watch_unref (socket_transport->write_watch);
94 socket_transport->write_watch = NULL;
97 _dbus_verbose ("%s end\n", _DBUS_FUNCTION_NAME);
101 socket_finalize (DBusTransport *transport)
103 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
105 _dbus_verbose ("%s\n", _DBUS_FUNCTION_NAME);
107 free_watches (transport);
109 _dbus_string_free (&socket_transport->encoded_outgoing);
110 _dbus_string_free (&socket_transport->encoded_incoming);
112 _dbus_transport_finalize_base (transport);
114 _dbus_assert (socket_transport->read_watch == NULL);
115 _dbus_assert (socket_transport->write_watch == NULL);
117 dbus_free (transport);
121 check_write_watch (DBusTransport *transport)
123 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
126 if (transport->connection == NULL)
129 if (transport->disconnected)
131 _dbus_assert (socket_transport->write_watch == NULL);
135 _dbus_transport_ref (transport);
137 if (_dbus_transport_get_is_authenticated (transport))
138 needed = _dbus_connection_has_messages_to_send_unlocked (transport->connection);
141 if (transport->send_credentials_pending)
145 DBusAuthState auth_state;
147 auth_state = _dbus_auth_do_work (transport->auth);
149 /* If we need memory we install the write watch just in case,
150 * if there's no need for it, it will get de-installed
151 * next time we try reading.
153 if (auth_state == DBUS_AUTH_STATE_HAVE_BYTES_TO_SEND ||
154 auth_state == DBUS_AUTH_STATE_WAITING_FOR_MEMORY)
161 _dbus_verbose ("check_write_watch(): needed = %d on connection %p watch %p fd = %d outgoing messages exist %d\n",
162 needed, transport->connection, socket_transport->write_watch,
163 socket_transport->fd,
164 _dbus_connection_has_messages_to_send_unlocked (transport->connection));
166 _dbus_connection_toggle_watch_unlocked (transport->connection,
167 socket_transport->write_watch,
170 _dbus_transport_unref (transport);
174 check_read_watch (DBusTransport *transport)
176 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
177 dbus_bool_t need_read_watch;
179 _dbus_verbose ("%s: fd = %d\n",
180 _DBUS_FUNCTION_NAME, socket_transport->fd);
182 if (transport->connection == NULL)
185 if (transport->disconnected)
187 _dbus_assert (socket_transport->read_watch == NULL);
191 _dbus_transport_ref (transport);
193 if (_dbus_transport_get_is_authenticated (transport))
195 _dbus_counter_get_value (transport->live_messages_size) < transport->max_live_messages_size;
198 if (transport->receive_credentials_pending)
199 need_read_watch = TRUE;
202 /* The reason to disable need_read_watch when not WAITING_FOR_INPUT
203 * is to avoid spinning on the file descriptor when we're waiting
204 * to write or for some other part of the auth process
206 DBusAuthState auth_state;
208 auth_state = _dbus_auth_do_work (transport->auth);
210 /* If we need memory we install the read watch just in case,
211 * if there's no need for it, it will get de-installed
212 * next time we try reading. If we're authenticated we
213 * install it since we normally have it installed while
216 if (auth_state == DBUS_AUTH_STATE_WAITING_FOR_INPUT ||
217 auth_state == DBUS_AUTH_STATE_WAITING_FOR_MEMORY ||
218 auth_state == DBUS_AUTH_STATE_AUTHENTICATED)
219 need_read_watch = TRUE;
221 need_read_watch = FALSE;
225 _dbus_verbose (" setting read watch enabled = %d\n", need_read_watch);
226 _dbus_connection_toggle_watch_unlocked (transport->connection,
227 socket_transport->read_watch,
230 _dbus_transport_unref (transport);
234 do_io_error (DBusTransport *transport)
236 _dbus_transport_ref (transport);
237 _dbus_transport_disconnect (transport);
238 _dbus_transport_unref (transport);
241 /* return value is whether we successfully read any new data. */
243 read_data_into_auth (DBusTransport *transport,
246 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
252 _dbus_auth_get_buffer (transport->auth, &buffer);
254 bytes_read = _dbus_read_socket (socket_transport->fd,
255 buffer, socket_transport->max_bytes_read_per_iteration);
257 _dbus_auth_return_buffer (transport->auth, buffer,
258 bytes_read > 0 ? bytes_read : 0);
262 _dbus_verbose (" read %d bytes in auth phase\n", bytes_read);
266 else if (bytes_read < 0)
268 /* EINTR already handled for us */
270 if (_dbus_get_is_errno_enomem ())
274 else if (_dbus_get_is_errno_eagain_or_ewouldblock ())
275 ; /* do nothing, just return FALSE below */
278 _dbus_verbose ("Error reading from remote app: %s\n",
279 _dbus_strerror_from_errno ());
280 do_io_error (transport);
287 _dbus_assert (bytes_read == 0);
289 _dbus_verbose ("Disconnected from remote app\n");
290 do_io_error (transport);
296 /* Return value is whether we successfully wrote any bytes */
298 write_data_from_auth (DBusTransport *transport)
300 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
302 const DBusString *buffer;
304 if (!_dbus_auth_get_bytes_to_send (transport->auth,
308 bytes_written = _dbus_write_socket (socket_transport->fd,
310 0, _dbus_string_get_length (buffer));
312 if (bytes_written > 0)
314 _dbus_auth_bytes_sent (transport->auth, bytes_written);
317 else if (bytes_written < 0)
319 /* EINTR already handled for us */
321 if (_dbus_get_is_errno_eagain_or_ewouldblock ())
325 _dbus_verbose ("Error writing to remote app: %s\n",
326 _dbus_strerror_from_errno ());
327 do_io_error (transport);
336 exchange_credentials (DBusTransport *transport,
337 dbus_bool_t do_reading,
338 dbus_bool_t do_writing)
340 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
343 _dbus_verbose ("exchange_credentials: do_reading = %d, do_writing = %d\n",
344 do_reading, do_writing);
346 dbus_error_init (&error);
347 if (do_writing && transport->send_credentials_pending)
349 if (_dbus_send_credentials_socket (socket_transport->fd,
352 transport->send_credentials_pending = FALSE;
356 _dbus_verbose ("Failed to write credentials: %s\n", error.message);
357 dbus_error_free (&error);
358 do_io_error (transport);
362 if (do_reading && transport->receive_credentials_pending)
364 /* FIXME this can fail due to IO error _or_ OOM, broken */
365 if (_dbus_read_credentials_socket (socket_transport->fd,
366 transport->credentials,
369 transport->receive_credentials_pending = FALSE;
373 _dbus_verbose ("Failed to read credentials %s\n", error.message);
374 dbus_error_free (&error);
375 do_io_error (transport);
379 if (!(transport->send_credentials_pending ||
380 transport->receive_credentials_pending))
382 if (!_dbus_auth_set_credentials (transport->auth,
383 transport->credentials))
391 do_authentication (DBusTransport *transport,
392 dbus_bool_t do_reading,
393 dbus_bool_t do_writing,
394 dbus_bool_t *auth_completed)
397 dbus_bool_t orig_auth_state;
401 orig_auth_state = _dbus_transport_get_is_authenticated (transport);
403 /* This is essential to avoid the check_write_watch() at the end,
404 * we don't want to add a write watch in do_iteration before
405 * we try writing and get EAGAIN
410 *auth_completed = FALSE;
414 _dbus_transport_ref (transport);
416 while (!_dbus_transport_get_is_authenticated (transport) &&
417 _dbus_transport_get_is_connected (transport))
419 if (!exchange_credentials (transport, do_reading, do_writing))
426 if (transport->send_credentials_pending ||
427 transport->receive_credentials_pending)
429 _dbus_verbose ("send_credentials_pending = %d receive_credentials_pending = %d\n",
430 transport->send_credentials_pending,
431 transport->receive_credentials_pending);
435 #define TRANSPORT_SIDE(t) ((t)->is_server ? "server" : "client")
436 switch (_dbus_auth_do_work (transport->auth))
438 case DBUS_AUTH_STATE_WAITING_FOR_INPUT:
439 _dbus_verbose (" %s auth state: waiting for input\n",
440 TRANSPORT_SIDE (transport));
441 if (!do_reading || !read_data_into_auth (transport, &oom))
445 case DBUS_AUTH_STATE_WAITING_FOR_MEMORY:
446 _dbus_verbose (" %s auth state: waiting for memory\n",
447 TRANSPORT_SIDE (transport));
452 case DBUS_AUTH_STATE_HAVE_BYTES_TO_SEND:
453 _dbus_verbose (" %s auth state: bytes to send\n",
454 TRANSPORT_SIDE (transport));
455 if (!do_writing || !write_data_from_auth (transport))
459 case DBUS_AUTH_STATE_NEED_DISCONNECT:
460 _dbus_verbose (" %s auth state: need to disconnect\n",
461 TRANSPORT_SIDE (transport));
462 do_io_error (transport);
465 case DBUS_AUTH_STATE_AUTHENTICATED:
466 _dbus_verbose (" %s auth state: authenticated\n",
467 TRANSPORT_SIDE (transport));
474 *auth_completed = (orig_auth_state != _dbus_transport_get_is_authenticated (transport));
476 check_read_watch (transport);
477 check_write_watch (transport);
478 _dbus_transport_unref (transport);
486 /* returns false on oom */
488 do_writing (DBusTransport *transport)
491 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
494 /* No messages without authentication! */
495 if (!_dbus_transport_get_is_authenticated (transport))
497 _dbus_verbose ("Not authenticated, not writing anything\n");
501 if (transport->disconnected)
503 _dbus_verbose ("Not connected, not writing anything\n");
508 _dbus_verbose ("do_writing(), have_messages = %d, fd = %d\n",
509 _dbus_connection_has_messages_to_send_unlocked (transport->connection),
510 socket_transport->fd);
516 while (!transport->disconnected &&
517 _dbus_connection_has_messages_to_send_unlocked (transport->connection))
520 DBusMessage *message;
521 const DBusString *header;
522 const DBusString *body;
523 int header_len, body_len;
524 int total_bytes_to_write;
526 if (total > socket_transport->max_bytes_written_per_iteration)
528 _dbus_verbose ("%d bytes exceeds %d bytes written per iteration, returning\n",
529 total, socket_transport->max_bytes_written_per_iteration);
533 message = _dbus_connection_get_message_to_send (transport->connection);
534 _dbus_assert (message != NULL);
535 _dbus_message_lock (message);
538 _dbus_verbose ("writing message %p\n", message);
541 _dbus_message_get_network_data (message,
544 header_len = _dbus_string_get_length (header);
545 body_len = _dbus_string_get_length (body);
547 if (_dbus_auth_needs_encoding (transport->auth))
549 if (_dbus_string_get_length (&socket_transport->encoded_outgoing) == 0)
551 if (!_dbus_auth_encode_data (transport->auth,
552 header, &socket_transport->encoded_outgoing))
558 if (!_dbus_auth_encode_data (transport->auth,
559 body, &socket_transport->encoded_outgoing))
561 _dbus_string_set_length (&socket_transport->encoded_outgoing, 0);
567 total_bytes_to_write = _dbus_string_get_length (&socket_transport->encoded_outgoing);
570 _dbus_verbose ("encoded message is %d bytes\n",
571 total_bytes_to_write);
575 _dbus_write_socket (socket_transport->fd,
576 &socket_transport->encoded_outgoing,
577 socket_transport->message_bytes_written,
578 total_bytes_to_write - socket_transport->message_bytes_written);
582 total_bytes_to_write = header_len + body_len;
585 _dbus_verbose ("message is %d bytes\n",
586 total_bytes_to_write);
589 if (socket_transport->message_bytes_written < header_len)
592 _dbus_write_socket_two (socket_transport->fd,
594 socket_transport->message_bytes_written,
595 header_len - socket_transport->message_bytes_written,
602 _dbus_write_socket (socket_transport->fd,
604 (socket_transport->message_bytes_written - header_len),
606 (socket_transport->message_bytes_written - header_len));
610 if (bytes_written < 0)
612 /* EINTR already handled for us */
614 if (_dbus_get_is_errno_eagain_or_ewouldblock ())
618 _dbus_verbose ("Error writing to remote app: %s\n",
619 _dbus_strerror_from_errno ());
620 do_io_error (transport);
626 _dbus_verbose (" wrote %d bytes of %d\n", bytes_written,
627 total_bytes_to_write);
629 total += bytes_written;
630 socket_transport->message_bytes_written += bytes_written;
632 _dbus_assert (socket_transport->message_bytes_written <=
633 total_bytes_to_write);
635 if (socket_transport->message_bytes_written == total_bytes_to_write)
637 socket_transport->message_bytes_written = 0;
638 _dbus_string_set_length (&socket_transport->encoded_outgoing, 0);
640 _dbus_connection_message_sent (transport->connection,
653 /* returns false on out-of-memory */
655 do_reading (DBusTransport *transport)
657 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
663 _dbus_verbose ("%s: fd = %d\n", _DBUS_FUNCTION_NAME,
664 socket_transport->fd);
666 /* No messages without authentication! */
667 if (!_dbus_transport_get_is_authenticated (transport))
676 /* See if we've exceeded max messages and need to disable reading */
677 check_read_watch (transport);
679 if (total > socket_transport->max_bytes_read_per_iteration)
681 _dbus_verbose ("%d bytes exceeds %d bytes read per iteration, returning\n",
682 total, socket_transport->max_bytes_read_per_iteration);
686 _dbus_assert (socket_transport->read_watch != NULL ||
687 transport->disconnected);
689 if (transport->disconnected)
692 if (!dbus_watch_get_enabled (socket_transport->read_watch))
695 if (_dbus_auth_needs_decoding (transport->auth))
697 if (_dbus_string_get_length (&socket_transport->encoded_incoming) > 0)
698 bytes_read = _dbus_string_get_length (&socket_transport->encoded_incoming);
700 bytes_read = _dbus_read_socket (socket_transport->fd,
701 &socket_transport->encoded_incoming,
702 socket_transport->max_bytes_read_per_iteration);
704 _dbus_assert (_dbus_string_get_length (&socket_transport->encoded_incoming) ==
711 _dbus_message_loader_get_buffer (transport->loader,
714 orig_len = _dbus_string_get_length (buffer);
716 if (!_dbus_auth_decode_data (transport->auth,
717 &socket_transport->encoded_incoming,
720 _dbus_verbose ("Out of memory decoding incoming data\n");
725 _dbus_message_loader_return_buffer (transport->loader,
727 _dbus_string_get_length (buffer) - orig_len);
729 _dbus_string_set_length (&socket_transport->encoded_incoming, 0);
734 _dbus_message_loader_get_buffer (transport->loader,
737 bytes_read = _dbus_read_socket (socket_transport->fd,
738 buffer, socket_transport->max_bytes_read_per_iteration);
740 _dbus_message_loader_return_buffer (transport->loader,
742 bytes_read < 0 ? 0 : bytes_read);
747 /* EINTR already handled for us */
749 if (_dbus_get_is_errno_enomem ())
751 _dbus_verbose ("Out of memory in read()/do_reading()\n");
755 else if (_dbus_get_is_errno_eagain_or_ewouldblock ())
759 _dbus_verbose ("Error reading from remote app: %s\n",
760 _dbus_strerror_from_errno ());
761 do_io_error (transport);
765 else if (bytes_read == 0)
767 _dbus_verbose ("Disconnected from remote app\n");
768 do_io_error (transport);
773 _dbus_verbose (" read %d bytes\n", bytes_read);
777 if (!_dbus_transport_queue_messages (transport))
780 _dbus_verbose (" out of memory when queueing messages we just read in the transport\n");
784 /* Try reading more data until we get EAGAIN and return, or
785 * exceed max bytes per iteration. If in blocking mode of
786 * course we'll block instead of returning.
799 socket_handle_watch (DBusTransport *transport,
803 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
805 _dbus_assert (watch == socket_transport->read_watch ||
806 watch == socket_transport->write_watch);
807 _dbus_assert (watch != NULL);
809 /* Disconnect in case of an error. In case of hangup do not
810 * disconnect the transport because data can still be in the buffer
811 * and do_reading may need several iteration to read it all (because
812 * of its max_bytes_read_per_iteration limit). The condition where
813 * flags == HANGUP (without READABLE) probably never happen in fact.
815 if ((flags & DBUS_WATCH_ERROR) ||
816 ((flags & DBUS_WATCH_HANGUP) && !(flags & DBUS_WATCH_READABLE)))
818 _dbus_verbose ("Hang up or error on watch\n");
819 _dbus_transport_disconnect (transport);
823 if (watch == socket_transport->read_watch &&
824 (flags & DBUS_WATCH_READABLE))
826 dbus_bool_t auth_finished;
828 _dbus_verbose ("handling read watch %p flags = %x\n",
831 if (!do_authentication (transport, TRUE, FALSE, &auth_finished))
834 /* We don't want to do a read immediately following
835 * a successful authentication. This is so we
836 * have a chance to propagate the authentication
837 * state further up. Specifically, we need to
838 * process any pending data from the auth object.
842 if (!do_reading (transport))
844 _dbus_verbose ("no memory to read\n");
850 _dbus_verbose ("Not reading anything since we just completed the authentication\n");
853 else if (watch == socket_transport->write_watch &&
854 (flags & DBUS_WATCH_WRITABLE))
857 _dbus_verbose ("handling write watch, have_outgoing_messages = %d\n",
858 _dbus_connection_has_messages_to_send_unlocked (transport->connection));
860 if (!do_authentication (transport, FALSE, TRUE, NULL))
863 if (!do_writing (transport))
865 _dbus_verbose ("no memory to write\n");
869 /* See if we still need the write watch */
870 check_write_watch (transport);
872 #ifdef DBUS_ENABLE_VERBOSE_MODE
875 if (watch == socket_transport->read_watch)
876 _dbus_verbose ("asked to handle read watch with non-read condition 0x%x\n",
878 else if (watch == socket_transport->write_watch)
879 _dbus_verbose ("asked to handle write watch with non-write condition 0x%x\n",
882 _dbus_verbose ("asked to handle watch %p on fd %d that we don't recognize\n",
883 watch, dbus_watch_get_fd (watch));
885 #endif /* DBUS_ENABLE_VERBOSE_MODE */
891 socket_disconnect (DBusTransport *transport)
893 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
895 _dbus_verbose ("%s\n", _DBUS_FUNCTION_NAME);
897 free_watches (transport);
899 _dbus_close_socket (socket_transport->fd, NULL);
900 socket_transport->fd = -1;
904 socket_connection_set (DBusTransport *transport)
906 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
908 _dbus_watch_set_handler (socket_transport->write_watch,
909 _dbus_connection_handle_watch,
910 transport->connection, NULL);
912 _dbus_watch_set_handler (socket_transport->read_watch,
913 _dbus_connection_handle_watch,
914 transport->connection, NULL);
916 if (!_dbus_connection_add_watch_unlocked (transport->connection,
917 socket_transport->write_watch))
920 if (!_dbus_connection_add_watch_unlocked (transport->connection,
921 socket_transport->read_watch))
923 _dbus_connection_remove_watch_unlocked (transport->connection,
924 socket_transport->write_watch);
928 check_read_watch (transport);
929 check_write_watch (transport);
935 * @todo We need to have a way to wake up the select sleep if
936 * a new iteration request comes in with a flag (read/write) that
937 * we're not currently serving. Otherwise a call that just reads
938 * could block a write call forever (if there are no incoming
942 socket_do_iteration (DBusTransport *transport,
944 int timeout_milliseconds)
946 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
951 _dbus_verbose (" iteration flags = %s%s timeout = %d read_watch = %p write_watch = %p fd = %d\n",
952 flags & DBUS_ITERATION_DO_READING ? "read" : "",
953 flags & DBUS_ITERATION_DO_WRITING ? "write" : "",
954 timeout_milliseconds,
955 socket_transport->read_watch,
956 socket_transport->write_watch,
957 socket_transport->fd);
959 /* the passed in DO_READING/DO_WRITING flags indicate whether to
960 * read/write messages, but regardless of those we may need to block
961 * for reading/writing to do auth. But if we do reading for auth,
962 * we don't want to read any messages yet if not given DO_READING.
965 poll_fd.fd = socket_transport->fd;
968 if (_dbus_transport_get_is_authenticated (transport))
970 /* This is kind of a hack; if we have stuff to write, then try
971 * to avoid the poll. This is probably about a 5% speedup on an
972 * echo client/server.
974 * If both reading and writing were requested, we want to avoid this
975 * since it could have funky effects:
976 * - both ends spinning waiting for the other one to read
977 * data so they can finish writing
978 * - prioritizing all writing ahead of reading
980 if ((flags & DBUS_ITERATION_DO_WRITING) &&
981 !(flags & (DBUS_ITERATION_DO_READING | DBUS_ITERATION_BLOCK)) &&
982 !transport->disconnected &&
983 _dbus_connection_has_messages_to_send_unlocked (transport->connection))
985 do_writing (transport);
987 if (transport->disconnected ||
988 !_dbus_connection_has_messages_to_send_unlocked (transport->connection))
992 /* If we get here, we decided to do the poll() after all */
993 _dbus_assert (socket_transport->read_watch);
994 if (flags & DBUS_ITERATION_DO_READING)
995 poll_fd.events |= _DBUS_POLLIN;
997 _dbus_assert (socket_transport->write_watch);
998 if (flags & DBUS_ITERATION_DO_WRITING)
999 poll_fd.events |= _DBUS_POLLOUT;
1003 DBusAuthState auth_state;
1005 auth_state = _dbus_auth_do_work (transport->auth);
1007 if (transport->receive_credentials_pending ||
1008 auth_state == DBUS_AUTH_STATE_WAITING_FOR_INPUT)
1009 poll_fd.events |= _DBUS_POLLIN;
1011 if (transport->send_credentials_pending ||
1012 auth_state == DBUS_AUTH_STATE_HAVE_BYTES_TO_SEND)
1013 poll_fd.events |= _DBUS_POLLOUT;
1018 if (flags & DBUS_ITERATION_BLOCK)
1019 poll_timeout = timeout_milliseconds;
1023 /* For blocking selects we drop the connection lock here
1024 * to avoid blocking out connection access during a potentially
1025 * indefinite blocking call. The io path is still protected
1026 * by the io_path_cond condvar, so we won't reenter this.
1028 if (flags & DBUS_ITERATION_BLOCK)
1030 _dbus_verbose ("unlock %s pre poll\n", _DBUS_FUNCTION_NAME);
1031 _dbus_connection_unlock (transport->connection);
1035 poll_res = _dbus_poll (&poll_fd, 1, poll_timeout);
1037 if (poll_res < 0 && _dbus_get_is_errno_eintr ())
1040 if (flags & DBUS_ITERATION_BLOCK)
1042 _dbus_verbose ("lock %s post poll\n", _DBUS_FUNCTION_NAME);
1043 _dbus_connection_lock (transport->connection);
1049 poll_fd.revents = 0; /* some concern that posix does not guarantee this;
1050 * valgrind flags it as an error. though it probably
1051 * is guaranteed on linux at least.
1054 if (poll_fd.revents & _DBUS_POLLERR)
1055 do_io_error (transport);
1058 dbus_bool_t need_read = (poll_fd.revents & _DBUS_POLLIN) > 0;
1059 dbus_bool_t need_write = (poll_fd.revents & _DBUS_POLLOUT) > 0;
1060 dbus_bool_t authentication_completed;
1062 _dbus_verbose ("in iteration, need_read=%d need_write=%d\n",
1063 need_read, need_write);
1064 do_authentication (transport, need_read, need_write,
1065 &authentication_completed);
1067 /* See comment in socket_handle_watch. */
1068 if (authentication_completed)
1071 if (need_read && (flags & DBUS_ITERATION_DO_READING))
1072 do_reading (transport);
1073 if (need_write && (flags & DBUS_ITERATION_DO_WRITING))
1074 do_writing (transport);
1079 _dbus_verbose ("Error from _dbus_poll(): %s\n",
1080 _dbus_strerror_from_errno ());
1086 /* We need to install the write watch only if we did not
1087 * successfully write everything. Note we need to be careful that we
1088 * don't call check_write_watch *before* do_writing, since it's
1089 * inefficient to add the write watch, and we can avoid it most of
1090 * the time since we can write immediately.
1092 * However, we MUST always call check_write_watch(); DBusConnection code
1093 * relies on the fact that running an iteration will notice that
1094 * messages are pending.
1096 check_write_watch (transport);
1098 _dbus_verbose (" ... leaving do_iteration()\n");
1102 socket_live_messages_changed (DBusTransport *transport)
1104 /* See if we should look for incoming messages again */
1105 check_read_watch (transport);
1110 socket_get_socket_fd (DBusTransport *transport,
1113 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
1115 *fd_p = socket_transport->fd;
1120 static const DBusTransportVTable socket_vtable = {
1122 socket_handle_watch,
1124 socket_connection_set,
1125 socket_do_iteration,
1126 socket_live_messages_changed,
1127 socket_get_socket_fd
1131 * Creates a new transport for the given socket file descriptor. The file
1132 * descriptor must be nonblocking (use _dbus_set_fd_nonblocking() to
1133 * make it so). This function is shared by various transports that
1134 * boil down to a full duplex file descriptor.
1136 * @param fd the file descriptor.
1137 * @param server_guid non-#NULL if this transport is on the server side of a connection
1138 * @param address the transport's address
1139 * @returns the new transport, or #NULL if no memory.
1142 _dbus_transport_new_for_socket (int fd,
1143 const DBusString *server_guid,
1144 const DBusString *address)
1146 DBusTransportSocket *socket_transport;
1148 socket_transport = dbus_new0 (DBusTransportSocket, 1);
1149 if (socket_transport == NULL)
1152 if (!_dbus_string_init (&socket_transport->encoded_outgoing))
1155 if (!_dbus_string_init (&socket_transport->encoded_incoming))
1158 socket_transport->write_watch = _dbus_watch_new (fd,
1159 DBUS_WATCH_WRITABLE,
1162 if (socket_transport->write_watch == NULL)
1165 socket_transport->read_watch = _dbus_watch_new (fd,
1166 DBUS_WATCH_READABLE,
1169 if (socket_transport->read_watch == NULL)
1172 if (!_dbus_transport_init_base (&socket_transport->base,
1174 server_guid, address))
1177 socket_transport->fd = fd;
1178 socket_transport->message_bytes_written = 0;
1180 /* These values should probably be tunable or something. */
1181 socket_transport->max_bytes_read_per_iteration = 2048;
1182 socket_transport->max_bytes_written_per_iteration = 2048;
1184 return (DBusTransport*) socket_transport;
1187 _dbus_watch_unref (socket_transport->read_watch);
1189 _dbus_watch_unref (socket_transport->write_watch);
1191 _dbus_string_free (&socket_transport->encoded_incoming);
1193 _dbus_string_free (&socket_transport->encoded_outgoing);
1195 dbus_free (socket_transport);
1200 * Creates a new transport for the given hostname and port.
1202 * @param host the host to connect to
1203 * @param port the port to connect to
1204 * @param error location to store reason for failure.
1205 * @returns a new transport, or #NULL on failure.
1208 _dbus_transport_new_for_tcp_socket (const char *host,
1213 DBusTransport *transport;
1216 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1218 if (!_dbus_string_init (&address))
1220 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1224 if (!_dbus_string_append (&address, "tcp:"))
1228 (!_dbus_string_append (&address, "host=") ||
1229 !_dbus_string_append (&address, host)))
1232 if (!_dbus_string_append (&address, ",port=") ||
1233 !_dbus_string_append_int (&address, port))
1236 fd = _dbus_connect_tcp_socket (host, port, error);
1239 _DBUS_ASSERT_ERROR_IS_SET (error);
1240 _dbus_string_free (&address);
1244 _dbus_fd_set_close_on_exec (fd);
1246 _dbus_verbose ("Successfully connected to tcp socket %s:%d\n",
1249 transport = _dbus_transport_new_for_socket (fd, NULL, &address);
1250 if (transport == NULL)
1252 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1253 _dbus_close_socket (fd, NULL);
1254 _dbus_string_free (&address);
1258 _dbus_string_free (&address);
1263 _dbus_string_free (&address);
1264 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1269 * Opens a TCP socket transport.
1271 * @param entry the address entry to try opening as a tcp transport.
1272 * @param transport_p return location for the opened transport
1273 * @param error error to be set
1274 * @returns result of the attempt
1276 DBusTransportOpenResult
1277 _dbus_transport_open_socket(DBusAddressEntry *entry,
1278 DBusTransport **transport_p,
1283 method = dbus_address_entry_get_method (entry);
1284 _dbus_assert (method != NULL);
1286 if (strcmp (method, "tcp") == 0)
1288 const char *host = dbus_address_entry_get_value (entry, "host");
1289 const char *port = dbus_address_entry_get_value (entry, "port");
1292 dbus_bool_t sresult;
1296 _dbus_set_bad_address (error, "tcp", "port", NULL);
1297 return DBUS_TRANSPORT_OPEN_BAD_ADDRESS;
1300 _dbus_string_init_const (&str, port);
1301 sresult = _dbus_string_parse_int (&str, 0, &lport, NULL);
1302 _dbus_string_free (&str);
1304 if (sresult == FALSE || lport <= 0 || lport > 65535)
1306 _dbus_set_bad_address (error, NULL, NULL,
1307 "Port is not an integer between 0 and 65535");
1308 return DBUS_TRANSPORT_OPEN_BAD_ADDRESS;
1311 *transport_p = _dbus_transport_new_for_tcp_socket (host, lport, error);
1312 if (*transport_p == NULL)
1314 _DBUS_ASSERT_ERROR_IS_SET (error);
1315 return DBUS_TRANSPORT_OPEN_DID_NOT_CONNECT;
1319 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1320 return DBUS_TRANSPORT_OPEN_OK;
1325 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1326 return DBUS_TRANSPORT_OPEN_NOT_HANDLED;