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"
32 * @defgroup DBusTransportSocket DBusTransport implementations for sockets
33 * @ingroup DBusInternals
34 * @brief Implementation details of DBusTransport on sockets
40 * Opaque object representing a socket file descriptor transport.
42 typedef struct DBusTransportSocket DBusTransportSocket;
45 * Implementation details of DBusTransportSocket. All members are private.
47 struct DBusTransportSocket
49 DBusTransport base; /**< Parent instance */
50 int fd; /**< File descriptor. */
51 DBusWatch *read_watch; /**< Watch for readability. */
52 DBusWatch *write_watch; /**< Watch for writability. */
54 int max_bytes_read_per_iteration; /**< To avoid blocking too long. */
55 int max_bytes_written_per_iteration; /**< To avoid blocking too long. */
57 int message_bytes_written; /**< Number of bytes of current
58 * outgoing message that have
61 DBusString encoded_outgoing; /**< Encoded version of current
64 DBusString encoded_incoming; /**< Encoded version of current
70 free_watches (DBusTransport *transport)
72 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
74 _dbus_verbose ("%s start\n", _DBUS_FUNCTION_NAME);
76 if (socket_transport->read_watch)
78 if (transport->connection)
79 _dbus_connection_remove_watch_unlocked (transport->connection,
80 socket_transport->read_watch);
81 _dbus_watch_invalidate (socket_transport->read_watch);
82 _dbus_watch_unref (socket_transport->read_watch);
83 socket_transport->read_watch = NULL;
86 if (socket_transport->write_watch)
88 if (transport->connection)
89 _dbus_connection_remove_watch_unlocked (transport->connection,
90 socket_transport->write_watch);
91 _dbus_watch_invalidate (socket_transport->write_watch);
92 _dbus_watch_unref (socket_transport->write_watch);
93 socket_transport->write_watch = NULL;
96 _dbus_verbose ("%s end\n", _DBUS_FUNCTION_NAME);
100 socket_finalize (DBusTransport *transport)
102 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
104 _dbus_verbose ("%s\n", _DBUS_FUNCTION_NAME);
106 free_watches (transport);
108 _dbus_string_free (&socket_transport->encoded_outgoing);
109 _dbus_string_free (&socket_transport->encoded_incoming);
111 _dbus_transport_finalize_base (transport);
113 _dbus_assert (socket_transport->read_watch == NULL);
114 _dbus_assert (socket_transport->write_watch == NULL);
116 dbus_free (transport);
120 check_write_watch (DBusTransport *transport)
122 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
125 if (transport->connection == NULL)
128 if (transport->disconnected)
130 _dbus_assert (socket_transport->write_watch == NULL);
134 _dbus_transport_ref (transport);
136 if (_dbus_transport_get_is_authenticated (transport))
137 needed = _dbus_connection_has_messages_to_send_unlocked (transport->connection);
140 if (transport->send_credentials_pending)
144 DBusAuthState auth_state;
146 auth_state = _dbus_auth_do_work (transport->auth);
148 /* If we need memory we install the write watch just in case,
149 * if there's no need for it, it will get de-installed
150 * next time we try reading.
152 if (auth_state == DBUS_AUTH_STATE_HAVE_BYTES_TO_SEND ||
153 auth_state == DBUS_AUTH_STATE_WAITING_FOR_MEMORY)
160 _dbus_verbose ("check_write_watch(): needed = %d on connection %p watch %p fd = %d outgoing messages exist %d\n",
161 needed, transport->connection, socket_transport->write_watch,
162 socket_transport->fd,
163 _dbus_connection_has_messages_to_send_unlocked (transport->connection));
165 _dbus_connection_toggle_watch_unlocked (transport->connection,
166 socket_transport->write_watch,
169 _dbus_transport_unref (transport);
173 check_read_watch (DBusTransport *transport)
175 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
176 dbus_bool_t need_read_watch;
178 _dbus_verbose ("%s: fd = %d\n",
179 _DBUS_FUNCTION_NAME, socket_transport->fd);
181 if (transport->connection == NULL)
184 if (transport->disconnected)
186 _dbus_assert (socket_transport->read_watch == NULL);
190 _dbus_transport_ref (transport);
192 if (_dbus_transport_get_is_authenticated (transport))
194 _dbus_counter_get_value (transport->live_messages_size) < transport->max_live_messages_size;
197 if (transport->receive_credentials_pending)
198 need_read_watch = TRUE;
201 /* The reason to disable need_read_watch when not WAITING_FOR_INPUT
202 * is to avoid spinning on the file descriptor when we're waiting
203 * to write or for some other part of the auth process
205 DBusAuthState auth_state;
207 auth_state = _dbus_auth_do_work (transport->auth);
209 /* If we need memory we install the read watch just in case,
210 * if there's no need for it, it will get de-installed
211 * next time we try reading. If we're authenticated we
212 * install it since we normally have it installed while
215 if (auth_state == DBUS_AUTH_STATE_WAITING_FOR_INPUT ||
216 auth_state == DBUS_AUTH_STATE_WAITING_FOR_MEMORY ||
217 auth_state == DBUS_AUTH_STATE_AUTHENTICATED)
218 need_read_watch = TRUE;
220 need_read_watch = FALSE;
224 _dbus_verbose (" setting read watch enabled = %d\n", need_read_watch);
225 _dbus_connection_toggle_watch_unlocked (transport->connection,
226 socket_transport->read_watch,
229 _dbus_transport_unref (transport);
233 do_io_error (DBusTransport *transport)
235 _dbus_transport_ref (transport);
236 _dbus_transport_disconnect (transport);
237 _dbus_transport_unref (transport);
240 /* return value is whether we successfully read any new data. */
242 read_data_into_auth (DBusTransport *transport,
245 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
251 _dbus_auth_get_buffer (transport->auth, &buffer);
253 bytes_read = _dbus_read_socket (socket_transport->fd,
254 buffer, socket_transport->max_bytes_read_per_iteration);
256 _dbus_auth_return_buffer (transport->auth, buffer,
257 bytes_read > 0 ? bytes_read : 0);
261 _dbus_verbose (" read %d bytes in auth phase\n", bytes_read);
265 else if (bytes_read < 0)
267 /* EINTR already handled for us */
273 else if (errno == EAGAIN ||
274 errno == EWOULDBLOCK)
275 ; /* do nothing, just return FALSE below */
278 _dbus_verbose ("Error reading from remote app: %s\n",
279 _dbus_strerror (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 (errno == EAGAIN ||
322 errno == EWOULDBLOCK)
326 _dbus_verbose ("Error writing to remote app: %s\n",
327 _dbus_strerror (errno));
328 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_unix_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 if (_dbus_read_credentials_unix_socket (socket_transport->fd,
365 &transport->credentials,
368 transport->receive_credentials_pending = FALSE;
372 _dbus_verbose ("Failed to read credentials %s\n", error.message);
373 dbus_error_free (&error);
374 do_io_error (transport);
378 if (!(transport->send_credentials_pending ||
379 transport->receive_credentials_pending))
381 _dbus_auth_set_credentials (transport->auth,
382 &transport->credentials);
387 do_authentication (DBusTransport *transport,
388 dbus_bool_t do_reading,
389 dbus_bool_t do_writing,
390 dbus_bool_t *auth_completed)
393 dbus_bool_t orig_auth_state;
397 orig_auth_state = _dbus_transport_get_is_authenticated (transport);
399 /* This is essential to avoid the check_write_watch() at the end,
400 * we don't want to add a write watch in do_iteration before
401 * we try writing and get EAGAIN
406 *auth_completed = FALSE;
410 _dbus_transport_ref (transport);
412 while (!_dbus_transport_get_is_authenticated (transport) &&
413 _dbus_transport_get_is_connected (transport))
415 exchange_credentials (transport, do_reading, do_writing);
417 if (transport->send_credentials_pending ||
418 transport->receive_credentials_pending)
420 _dbus_verbose ("send_credentials_pending = %d receive_credentials_pending = %d\n",
421 transport->send_credentials_pending,
422 transport->receive_credentials_pending);
426 #define TRANSPORT_SIDE(t) ((t)->is_server ? "server" : "client")
427 switch (_dbus_auth_do_work (transport->auth))
429 case DBUS_AUTH_STATE_WAITING_FOR_INPUT:
430 _dbus_verbose (" %s auth state: waiting for input\n",
431 TRANSPORT_SIDE (transport));
432 if (!do_reading || !read_data_into_auth (transport, &oom))
436 case DBUS_AUTH_STATE_WAITING_FOR_MEMORY:
437 _dbus_verbose (" %s auth state: waiting for memory\n",
438 TRANSPORT_SIDE (transport));
443 case DBUS_AUTH_STATE_HAVE_BYTES_TO_SEND:
444 _dbus_verbose (" %s auth state: bytes to send\n",
445 TRANSPORT_SIDE (transport));
446 if (!do_writing || !write_data_from_auth (transport))
450 case DBUS_AUTH_STATE_NEED_DISCONNECT:
451 _dbus_verbose (" %s auth state: need to disconnect\n",
452 TRANSPORT_SIDE (transport));
453 do_io_error (transport);
456 case DBUS_AUTH_STATE_AUTHENTICATED:
457 _dbus_verbose (" %s auth state: authenticated\n",
458 TRANSPORT_SIDE (transport));
465 *auth_completed = (orig_auth_state != _dbus_transport_get_is_authenticated (transport));
467 check_read_watch (transport);
468 check_write_watch (transport);
469 _dbus_transport_unref (transport);
477 /* returns false on oom */
479 do_writing (DBusTransport *transport)
482 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
485 /* No messages without authentication! */
486 if (!_dbus_transport_get_is_authenticated (transport))
488 _dbus_verbose ("Not authenticated, not writing anything\n");
492 if (transport->disconnected)
494 _dbus_verbose ("Not connected, not writing anything\n");
499 _dbus_verbose ("do_writing(), have_messages = %d, fd = %d\n",
500 _dbus_connection_has_messages_to_send_unlocked (transport->connection),
501 socket_transport->fd);
507 while (!transport->disconnected &&
508 _dbus_connection_has_messages_to_send_unlocked (transport->connection))
511 DBusMessage *message;
512 const DBusString *header;
513 const DBusString *body;
514 int header_len, body_len;
515 int total_bytes_to_write;
517 if (total > socket_transport->max_bytes_written_per_iteration)
519 _dbus_verbose ("%d bytes exceeds %d bytes written per iteration, returning\n",
520 total, socket_transport->max_bytes_written_per_iteration);
524 message = _dbus_connection_get_message_to_send (transport->connection);
525 _dbus_assert (message != NULL);
526 _dbus_message_lock (message);
529 _dbus_verbose ("writing message %p\n", message);
532 _dbus_message_get_network_data (message,
535 header_len = _dbus_string_get_length (header);
536 body_len = _dbus_string_get_length (body);
538 if (_dbus_auth_needs_encoding (transport->auth))
540 if (_dbus_string_get_length (&socket_transport->encoded_outgoing) == 0)
542 if (!_dbus_auth_encode_data (transport->auth,
543 header, &socket_transport->encoded_outgoing))
549 if (!_dbus_auth_encode_data (transport->auth,
550 body, &socket_transport->encoded_outgoing))
552 _dbus_string_set_length (&socket_transport->encoded_outgoing, 0);
558 total_bytes_to_write = _dbus_string_get_length (&socket_transport->encoded_outgoing);
561 _dbus_verbose ("encoded message is %d bytes\n",
562 total_bytes_to_write);
566 _dbus_write_socket (socket_transport->fd,
567 &socket_transport->encoded_outgoing,
568 socket_transport->message_bytes_written,
569 total_bytes_to_write - socket_transport->message_bytes_written);
573 total_bytes_to_write = header_len + body_len;
576 _dbus_verbose ("message is %d bytes\n",
577 total_bytes_to_write);
580 if (socket_transport->message_bytes_written < header_len)
583 _dbus_write_socket_two (socket_transport->fd,
585 socket_transport->message_bytes_written,
586 header_len - socket_transport->message_bytes_written,
593 _dbus_write_socket (socket_transport->fd,
595 (socket_transport->message_bytes_written - header_len),
597 (socket_transport->message_bytes_written - header_len));
601 if (bytes_written < 0)
603 /* EINTR already handled for us */
605 if (errno == EAGAIN ||
606 errno == EWOULDBLOCK)
610 _dbus_verbose ("Error writing to remote app: %s\n",
611 _dbus_strerror (errno));
612 do_io_error (transport);
618 _dbus_verbose (" wrote %d bytes of %d\n", bytes_written,
619 total_bytes_to_write);
621 total += bytes_written;
622 socket_transport->message_bytes_written += bytes_written;
624 _dbus_assert (socket_transport->message_bytes_written <=
625 total_bytes_to_write);
627 if (socket_transport->message_bytes_written == total_bytes_to_write)
629 socket_transport->message_bytes_written = 0;
630 _dbus_string_set_length (&socket_transport->encoded_outgoing, 0);
632 _dbus_connection_message_sent (transport->connection,
645 /* returns false on out-of-memory */
647 do_reading (DBusTransport *transport)
649 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
655 _dbus_verbose ("%s: fd = %d\n", _DBUS_FUNCTION_NAME,
656 socket_transport->fd);
658 /* No messages without authentication! */
659 if (!_dbus_transport_get_is_authenticated (transport))
668 /* See if we've exceeded max messages and need to disable reading */
669 check_read_watch (transport);
671 if (total > socket_transport->max_bytes_read_per_iteration)
673 _dbus_verbose ("%d bytes exceeds %d bytes read per iteration, returning\n",
674 total, socket_transport->max_bytes_read_per_iteration);
678 _dbus_assert (socket_transport->read_watch != NULL ||
679 transport->disconnected);
681 if (transport->disconnected)
684 if (!dbus_watch_get_enabled (socket_transport->read_watch))
687 if (_dbus_auth_needs_decoding (transport->auth))
689 if (_dbus_string_get_length (&socket_transport->encoded_incoming) > 0)
690 bytes_read = _dbus_string_get_length (&socket_transport->encoded_incoming);
692 bytes_read = _dbus_read_socket (socket_transport->fd,
693 &socket_transport->encoded_incoming,
694 socket_transport->max_bytes_read_per_iteration);
696 _dbus_assert (_dbus_string_get_length (&socket_transport->encoded_incoming) ==
703 _dbus_message_loader_get_buffer (transport->loader,
706 orig_len = _dbus_string_get_length (buffer);
708 if (!_dbus_auth_decode_data (transport->auth,
709 &socket_transport->encoded_incoming,
712 _dbus_verbose ("Out of memory decoding incoming data\n");
717 _dbus_message_loader_return_buffer (transport->loader,
719 _dbus_string_get_length (buffer) - orig_len);
721 _dbus_string_set_length (&socket_transport->encoded_incoming, 0);
726 _dbus_message_loader_get_buffer (transport->loader,
729 bytes_read = _dbus_read_socket (socket_transport->fd,
730 buffer, socket_transport->max_bytes_read_per_iteration);
732 _dbus_message_loader_return_buffer (transport->loader,
734 bytes_read < 0 ? 0 : bytes_read);
739 /* EINTR already handled for us */
743 _dbus_verbose ("Out of memory in read()/do_reading()\n");
747 else if (errno == EAGAIN ||
748 errno == EWOULDBLOCK)
752 _dbus_verbose ("Error reading from remote app: %s\n",
753 _dbus_strerror (errno));
754 do_io_error (transport);
758 else if (bytes_read == 0)
760 _dbus_verbose ("Disconnected from remote app\n");
761 do_io_error (transport);
766 _dbus_verbose (" read %d bytes\n", bytes_read);
770 if (!_dbus_transport_queue_messages (transport))
773 _dbus_verbose (" out of memory when queueing messages we just read in the transport\n");
777 /* Try reading more data until we get EAGAIN and return, or
778 * exceed max bytes per iteration. If in blocking mode of
779 * course we'll block instead of returning.
792 socket_handle_watch (DBusTransport *transport,
796 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
798 _dbus_assert (watch == socket_transport->read_watch ||
799 watch == socket_transport->write_watch);
800 _dbus_assert (watch != NULL);
802 /* Disconnect in case of an error. In case of hangup do not
803 * disconnect the transport because data can still be in the buffer
804 * and do_reading may need several iteration to read it all (because
805 * of its max_bytes_read_per_iteration limit). The condition where
806 * flags == HANGUP (without READABLE) probably never happen in fact.
808 if ((flags & DBUS_WATCH_ERROR) ||
809 ((flags & DBUS_WATCH_HANGUP) && !(flags & DBUS_WATCH_READABLE)))
811 _dbus_verbose ("Hang up or error on watch\n");
812 _dbus_transport_disconnect (transport);
816 if (watch == socket_transport->read_watch &&
817 (flags & DBUS_WATCH_READABLE))
819 dbus_bool_t auth_finished;
821 _dbus_verbose ("handling read watch %p flags = %x\n",
824 if (!do_authentication (transport, TRUE, FALSE, &auth_finished))
827 /* We don't want to do a read immediately following
828 * a successful authentication. This is so we
829 * have a chance to propagate the authentication
830 * state further up. Specifically, we need to
831 * process any pending data from the auth object.
835 if (!do_reading (transport))
837 _dbus_verbose ("no memory to read\n");
843 _dbus_verbose ("Not reading anything since we just completed the authentication\n");
846 else if (watch == socket_transport->write_watch &&
847 (flags & DBUS_WATCH_WRITABLE))
850 _dbus_verbose ("handling write watch, have_outgoing_messages = %d\n",
851 _dbus_connection_has_messages_to_send_unlocked (transport->connection));
853 if (!do_authentication (transport, FALSE, TRUE, NULL))
856 if (!do_writing (transport))
858 _dbus_verbose ("no memory to write\n");
862 /* See if we still need the write watch */
863 check_write_watch (transport);
865 #ifdef DBUS_ENABLE_VERBOSE_MODE
868 if (watch == socket_transport->read_watch)
869 _dbus_verbose ("asked to handle read watch with non-read condition 0x%x\n",
871 else if (watch == socket_transport->write_watch)
872 _dbus_verbose ("asked to handle write watch with non-write condition 0x%x\n",
875 _dbus_verbose ("asked to handle watch %p on fd %d that we don't recognize\n",
876 watch, dbus_watch_get_fd (watch));
878 #endif /* DBUS_ENABLE_VERBOSE_MODE */
884 socket_disconnect (DBusTransport *transport)
886 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
888 _dbus_verbose ("%s\n", _DBUS_FUNCTION_NAME);
890 free_watches (transport);
892 _dbus_close_socket (socket_transport->fd, NULL);
893 socket_transport->fd = -1;
897 socket_connection_set (DBusTransport *transport)
899 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
901 _dbus_watch_set_handler (socket_transport->write_watch,
902 _dbus_connection_handle_watch,
903 transport->connection, NULL);
905 _dbus_watch_set_handler (socket_transport->read_watch,
906 _dbus_connection_handle_watch,
907 transport->connection, NULL);
909 if (!_dbus_connection_add_watch_unlocked (transport->connection,
910 socket_transport->write_watch))
913 if (!_dbus_connection_add_watch_unlocked (transport->connection,
914 socket_transport->read_watch))
916 _dbus_connection_remove_watch_unlocked (transport->connection,
917 socket_transport->write_watch);
921 check_read_watch (transport);
922 check_write_watch (transport);
928 * @todo We need to have a way to wake up the select sleep if
929 * a new iteration request comes in with a flag (read/write) that
930 * we're not currently serving. Otherwise a call that just reads
931 * could block a write call forever (if there are no incoming
935 socket_do_iteration (DBusTransport *transport,
937 int timeout_milliseconds)
939 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
944 _dbus_verbose (" iteration flags = %s%s timeout = %d read_watch = %p write_watch = %p fd = %d\n",
945 flags & DBUS_ITERATION_DO_READING ? "read" : "",
946 flags & DBUS_ITERATION_DO_WRITING ? "write" : "",
947 timeout_milliseconds,
948 socket_transport->read_watch,
949 socket_transport->write_watch,
950 socket_transport->fd);
952 /* the passed in DO_READING/DO_WRITING flags indicate whether to
953 * read/write messages, but regardless of those we may need to block
954 * for reading/writing to do auth. But if we do reading for auth,
955 * we don't want to read any messages yet if not given DO_READING.
958 poll_fd.fd = socket_transport->fd;
961 if (_dbus_transport_get_is_authenticated (transport))
963 /* This is kind of a hack; if we have stuff to write, then try
964 * to avoid the poll. This is probably about a 5% speedup on an
965 * echo client/server.
967 * If both reading and writing were requested, we want to avoid this
968 * since it could have funky effects:
969 * - both ends spinning waiting for the other one to read
970 * data so they can finish writing
971 * - prioritizing all writing ahead of reading
973 if ((flags & DBUS_ITERATION_DO_WRITING) &&
974 !(flags & (DBUS_ITERATION_DO_READING | DBUS_ITERATION_BLOCK)) &&
975 !transport->disconnected &&
976 _dbus_connection_has_messages_to_send_unlocked (transport->connection))
978 do_writing (transport);
980 if (transport->disconnected ||
981 !_dbus_connection_has_messages_to_send_unlocked (transport->connection))
985 /* If we get here, we decided to do the poll() after all */
986 _dbus_assert (socket_transport->read_watch);
987 if (flags & DBUS_ITERATION_DO_READING)
988 poll_fd.events |= _DBUS_POLLIN;
990 _dbus_assert (socket_transport->write_watch);
991 if (flags & DBUS_ITERATION_DO_WRITING)
992 poll_fd.events |= _DBUS_POLLOUT;
996 DBusAuthState auth_state;
998 auth_state = _dbus_auth_do_work (transport->auth);
1000 if (transport->receive_credentials_pending ||
1001 auth_state == DBUS_AUTH_STATE_WAITING_FOR_INPUT)
1002 poll_fd.events |= _DBUS_POLLIN;
1004 if (transport->send_credentials_pending ||
1005 auth_state == DBUS_AUTH_STATE_HAVE_BYTES_TO_SEND)
1006 poll_fd.events |= _DBUS_POLLOUT;
1011 if (flags & DBUS_ITERATION_BLOCK)
1012 poll_timeout = timeout_milliseconds;
1016 /* For blocking selects we drop the connection lock here
1017 * to avoid blocking out connection access during a potentially
1018 * indefinite blocking call. The io path is still protected
1019 * by the io_path_cond condvar, so we won't reenter this.
1021 if (flags & DBUS_ITERATION_BLOCK)
1023 _dbus_verbose ("unlock %s pre poll\n", _DBUS_FUNCTION_NAME);
1024 _dbus_connection_unlock (transport->connection);
1028 poll_res = _dbus_poll (&poll_fd, 1, poll_timeout);
1030 if (poll_res < 0 && errno == EINTR)
1033 if (flags & DBUS_ITERATION_BLOCK)
1035 _dbus_verbose ("lock %s post poll\n", _DBUS_FUNCTION_NAME);
1036 _dbus_connection_lock (transport->connection);
1042 poll_fd.revents = 0; /* some concern that posix does not guarantee this;
1043 * valgrind flags it as an error. though it probably
1044 * is guaranteed on linux at least.
1047 if (poll_fd.revents & _DBUS_POLLERR)
1048 do_io_error (transport);
1051 dbus_bool_t need_read = (poll_fd.revents & _DBUS_POLLIN) > 0;
1052 dbus_bool_t need_write = (poll_fd.revents & _DBUS_POLLOUT) > 0;
1053 dbus_bool_t authentication_completed;
1055 _dbus_verbose ("in iteration, need_read=%d need_write=%d\n",
1056 need_read, need_write);
1057 do_authentication (transport, need_read, need_write,
1058 &authentication_completed);
1060 /* See comment in socket_handle_watch. */
1061 if (authentication_completed)
1064 if (need_read && (flags & DBUS_ITERATION_DO_READING))
1065 do_reading (transport);
1066 if (need_write && (flags & DBUS_ITERATION_DO_WRITING))
1067 do_writing (transport);
1072 _dbus_verbose ("Error from _dbus_poll(): %s\n",
1073 _dbus_strerror (errno));
1079 /* We need to install the write watch only if we did not
1080 * successfully write everything. Note we need to be careful that we
1081 * don't call check_write_watch *before* do_writing, since it's
1082 * inefficient to add the write watch, and we can avoid it most of
1083 * the time since we can write immediately.
1085 * However, we MUST always call check_write_watch(); DBusConnection code
1086 * relies on the fact that running an iteration will notice that
1087 * messages are pending.
1089 check_write_watch (transport);
1091 _dbus_verbose (" ... leaving do_iteration()\n");
1095 socket_live_messages_changed (DBusTransport *transport)
1097 /* See if we should look for incoming messages again */
1098 check_read_watch (transport);
1103 socket_get_socket_fd (DBusTransport *transport,
1106 DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
1108 *fd_p = socket_transport->fd;
1113 static const DBusTransportVTable socket_vtable = {
1115 socket_handle_watch,
1117 socket_connection_set,
1118 socket_do_iteration,
1119 socket_live_messages_changed,
1120 socket_get_socket_fd
1124 * Creates a new transport for the given socket file descriptor. The file
1125 * descriptor must be nonblocking (use _dbus_set_fd_nonblocking() to
1126 * make it so). This function is shared by various transports that
1127 * boil down to a full duplex file descriptor.
1129 * @param fd the file descriptor.
1130 * @param server_guid non-#NULL if this transport is on the server side of a connection
1131 * @param address the transport's address
1132 * @returns the new transport, or #NULL if no memory.
1135 _dbus_transport_new_for_socket (int fd,
1136 const DBusString *server_guid,
1137 const DBusString *address)
1139 DBusTransportSocket *socket_transport;
1141 socket_transport = dbus_new0 (DBusTransportSocket, 1);
1142 if (socket_transport == NULL)
1145 if (!_dbus_string_init (&socket_transport->encoded_outgoing))
1148 if (!_dbus_string_init (&socket_transport->encoded_incoming))
1151 socket_transport->write_watch = _dbus_watch_new (fd,
1152 DBUS_WATCH_WRITABLE,
1155 if (socket_transport->write_watch == NULL)
1158 socket_transport->read_watch = _dbus_watch_new (fd,
1159 DBUS_WATCH_READABLE,
1162 if (socket_transport->read_watch == NULL)
1165 if (!_dbus_transport_init_base (&socket_transport->base,
1167 server_guid, address))
1170 socket_transport->fd = fd;
1171 socket_transport->message_bytes_written = 0;
1173 /* These values should probably be tunable or something. */
1174 socket_transport->max_bytes_read_per_iteration = 2048;
1175 socket_transport->max_bytes_written_per_iteration = 2048;
1177 return (DBusTransport*) socket_transport;
1180 _dbus_watch_unref (socket_transport->read_watch);
1182 _dbus_watch_unref (socket_transport->write_watch);
1184 _dbus_string_free (&socket_transport->encoded_incoming);
1186 _dbus_string_free (&socket_transport->encoded_outgoing);
1188 dbus_free (socket_transport);
1193 * Creates a new transport for the given hostname and port.
1195 * @param host the host to connect to
1196 * @param port the port to connect to
1197 * @param error location to store reason for failure.
1198 * @returns a new transport, or #NULL on failure.
1201 _dbus_transport_new_for_tcp_socket (const char *host,
1206 DBusTransport *transport;
1209 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1211 if (!_dbus_string_init (&address))
1213 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1217 if (!_dbus_string_append (&address, "tcp:"))
1221 (!_dbus_string_append (&address, "host=") ||
1222 !_dbus_string_append (&address, host)))
1225 if (!_dbus_string_append (&address, ",port=") ||
1226 !_dbus_string_append_int (&address, port))
1229 fd = _dbus_connect_tcp_socket (host, port, error);
1232 _DBUS_ASSERT_ERROR_IS_SET (error);
1233 _dbus_string_free (&address);
1237 _dbus_fd_set_close_on_exec (fd);
1239 _dbus_verbose ("Successfully connected to tcp socket %s:%d\n",
1242 transport = _dbus_transport_new_for_socket (fd, NULL, &address);
1243 if (transport == NULL)
1245 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1246 _dbus_close_socket (fd, NULL);
1247 _dbus_string_free (&address);
1251 _dbus_string_free (&address);
1256 _dbus_string_free (&address);
1257 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1262 * Opens a TCP socket transport.
1264 * @param entry the address entry to try opening as a tcp transport.
1265 * @param transport_p return location for the opened transport
1266 * @param error error to be set
1267 * @returns result of the attempt
1269 DBusTransportOpenResult
1270 _dbus_transport_open_socket(DBusAddressEntry *entry,
1271 DBusTransport **transport_p,
1276 method = dbus_address_entry_get_method (entry);
1277 _dbus_assert (method != NULL);
1279 if (strcmp (method, "tcp") == 0)
1281 const char *host = dbus_address_entry_get_value (entry, "host");
1282 const char *port = dbus_address_entry_get_value (entry, "port");
1285 dbus_bool_t sresult;
1289 _dbus_set_bad_address (error, "tcp", "port", NULL);
1290 return DBUS_TRANSPORT_OPEN_BAD_ADDRESS;
1293 _dbus_string_init_const (&str, port);
1294 sresult = _dbus_string_parse_int (&str, 0, &lport, NULL);
1295 _dbus_string_free (&str);
1297 if (sresult == FALSE || lport <= 0 || lport > 65535)
1299 _dbus_set_bad_address (error, NULL, NULL,
1300 "Port is not an integer between 0 and 65535");
1301 return DBUS_TRANSPORT_OPEN_BAD_ADDRESS;
1304 *transport_p = _dbus_transport_new_for_tcp_socket (host, lport, error);
1305 if (*transport_p == NULL)
1307 _DBUS_ASSERT_ERROR_IS_SET (error);
1308 return DBUS_TRANSPORT_OPEN_DID_NOT_CONNECT;
1312 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1313 return DBUS_TRANSPORT_OPEN_OK;
1318 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1319 return DBUS_TRANSPORT_OPEN_NOT_HANDLED;