--- /dev/null
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+/* dbus-transport-socket.c Socket subclasses of DBusTransport
+ *
+ * Copyright (C) 2002, 2003, 2004, 2006 Red Hat Inc.
+ *
+ * Licensed under the Academic Free License version 2.1
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include "dbus-internals.h"
+#include "dbus-connection-internal.h"
+#include "dbus-transport-socket.h"
+#include "dbus-transport-protected.h"
+#include "dbus-watch.h"
+#include "dbus-credentials.h"
+
+
+/**
+ * @defgroup DBusTransportSocket DBusTransport implementations for sockets
+ * @ingroup DBusInternals
+ * @brief Implementation details of DBusTransport on sockets
+ *
+ * @{
+ */
+
+/**
+ * Opaque object representing a socket file descriptor transport.
+ */
+typedef struct DBusTransportSocket DBusTransportSocket;
+
+/**
+ * Implementation details of DBusTransportSocket. All members are private.
+ */
+struct DBusTransportSocket
+{
+ DBusTransport base; /**< Parent instance */
+ int fd; /**< File descriptor. */
+ DBusWatch *read_watch; /**< Watch for readability. */
+ DBusWatch *write_watch; /**< Watch for writability. */
+
+ int max_bytes_read_per_iteration; /**< To avoid blocking too long. */
+ int max_bytes_written_per_iteration; /**< To avoid blocking too long. */
+
+ int message_bytes_written; /**< Number of bytes of current
+ * outgoing message that have
+ * been written.
+ */
+ DBusString encoded_outgoing; /**< Encoded version of current
+ * outgoing message.
+ */
+ DBusString encoded_incoming; /**< Encoded version of current
+ * incoming data.
+ */
+};
+
+static void
+free_watches (DBusTransport *transport)
+{
+ DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
+
+ _dbus_verbose ("%s start\n", _DBUS_FUNCTION_NAME);
+
+ if (socket_transport->read_watch)
+ {
+ if (transport->connection)
+ _dbus_connection_remove_watch_unlocked (transport->connection,
+ socket_transport->read_watch);
+ _dbus_watch_invalidate (socket_transport->read_watch);
+ _dbus_watch_unref (socket_transport->read_watch);
+ socket_transport->read_watch = NULL;
+ }
+
+ if (socket_transport->write_watch)
+ {
+ if (transport->connection)
+ _dbus_connection_remove_watch_unlocked (transport->connection,
+ socket_transport->write_watch);
+ _dbus_watch_invalidate (socket_transport->write_watch);
+ _dbus_watch_unref (socket_transport->write_watch);
+ socket_transport->write_watch = NULL;
+ }
+
+ _dbus_verbose ("%s end\n", _DBUS_FUNCTION_NAME);
+}
+
+static void
+socket_finalize (DBusTransport *transport)
+{
+ DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
+
+ _dbus_verbose ("%s\n", _DBUS_FUNCTION_NAME);
+
+ free_watches (transport);
+
+ _dbus_string_free (&socket_transport->encoded_outgoing);
+ _dbus_string_free (&socket_transport->encoded_incoming);
+
+ _dbus_transport_finalize_base (transport);
+
+ _dbus_assert (socket_transport->read_watch == NULL);
+ _dbus_assert (socket_transport->write_watch == NULL);
+
+ dbus_free (transport);
+}
+
+static void
+check_write_watch (DBusTransport *transport)
+{
+ DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
+ dbus_bool_t needed;
+
+ if (transport->connection == NULL)
+ return;
+
+ if (transport->disconnected)
+ {
+ _dbus_assert (socket_transport->write_watch == NULL);
+ return;
+ }
+
+ _dbus_transport_ref (transport);
+
+ if (_dbus_transport_get_is_authenticated (transport))
+ needed = _dbus_connection_has_messages_to_send_unlocked (transport->connection);
+ else
+ {
+ if (transport->send_credentials_pending)
+ needed = TRUE;
+ else
+ {
+ DBusAuthState auth_state;
+
+ auth_state = _dbus_auth_do_work (transport->auth);
+
+ /* If we need memory we install the write watch just in case,
+ * if there's no need for it, it will get de-installed
+ * next time we try reading.
+ */
+ if (auth_state == DBUS_AUTH_STATE_HAVE_BYTES_TO_SEND ||
+ auth_state == DBUS_AUTH_STATE_WAITING_FOR_MEMORY)
+ needed = TRUE;
+ else
+ needed = FALSE;
+ }
+ }
+
+ _dbus_verbose ("check_write_watch(): needed = %d on connection %p watch %p fd = %d outgoing messages exist %d\n",
+ needed, transport->connection, socket_transport->write_watch,
+ socket_transport->fd,
+ _dbus_connection_has_messages_to_send_unlocked (transport->connection));
+
+ _dbus_connection_toggle_watch_unlocked (transport->connection,
+ socket_transport->write_watch,
+ needed);
+
+ _dbus_transport_unref (transport);
+}
+
+static void
+check_read_watch (DBusTransport *transport)
+{
+ DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
+ dbus_bool_t need_read_watch;
+
+ _dbus_verbose ("%s: fd = %d\n",
+ _DBUS_FUNCTION_NAME, socket_transport->fd);
+
+ if (transport->connection == NULL)
+ return;
+
+ if (transport->disconnected)
+ {
+ _dbus_assert (socket_transport->read_watch == NULL);
+ return;
+ }
+
+ _dbus_transport_ref (transport);
+
+ if (_dbus_transport_get_is_authenticated (transport))
+ need_read_watch =
+ _dbus_counter_get_value (transport->live_messages_size) < transport->max_live_messages_size;
+ else
+ {
+ if (transport->receive_credentials_pending)
+ need_read_watch = TRUE;
+ else
+ {
+ /* The reason to disable need_read_watch when not WAITING_FOR_INPUT
+ * is to avoid spinning on the file descriptor when we're waiting
+ * to write or for some other part of the auth process
+ */
+ DBusAuthState auth_state;
+
+ auth_state = _dbus_auth_do_work (transport->auth);
+
+ /* If we need memory we install the read watch just in case,
+ * if there's no need for it, it will get de-installed
+ * next time we try reading. If we're authenticated we
+ * install it since we normally have it installed while
+ * authenticated.
+ */
+ if (auth_state == DBUS_AUTH_STATE_WAITING_FOR_INPUT ||
+ auth_state == DBUS_AUTH_STATE_WAITING_FOR_MEMORY ||
+ auth_state == DBUS_AUTH_STATE_AUTHENTICATED)
+ need_read_watch = TRUE;
+ else
+ need_read_watch = FALSE;
+ }
+ }
+
+ _dbus_verbose (" setting read watch enabled = %d\n", need_read_watch);
+ _dbus_connection_toggle_watch_unlocked (transport->connection,
+ socket_transport->read_watch,
+ need_read_watch);
+
+ _dbus_transport_unref (transport);
+}
+
+static void
+do_io_error (DBusTransport *transport)
+{
+ _dbus_transport_ref (transport);
+ _dbus_transport_disconnect (transport);
+ _dbus_transport_unref (transport);
+}
+
+/* return value is whether we successfully read any new data. */
+static dbus_bool_t
+read_data_into_auth (DBusTransport *transport,
+ dbus_bool_t *oom)
+{
+ DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
+ DBusString *buffer;
+ int bytes_read;
+
+ *oom = FALSE;
+
+ _dbus_auth_get_buffer (transport->auth, &buffer);
+
+ bytes_read = _dbus_read_socket (socket_transport->fd,
+ buffer, socket_transport->max_bytes_read_per_iteration);
+
+ _dbus_auth_return_buffer (transport->auth, buffer,
+ bytes_read > 0 ? bytes_read : 0);
+
+ if (bytes_read > 0)
+ {
+ _dbus_verbose (" read %d bytes in auth phase\n", bytes_read);
+
+ return TRUE;
+ }
+ else if (bytes_read < 0)
+ {
+ /* EINTR already handled for us */
+
+ if (_dbus_get_is_errno_enomem ())
+ {
+ *oom = TRUE;
+ }
+ else if (_dbus_get_is_errno_eagain_or_ewouldblock ())
+ ; /* do nothing, just return FALSE below */
+ else
+ {
+ _dbus_verbose ("Error reading from remote app: %s\n",
+ _dbus_strerror_from_errno ());
+ do_io_error (transport);
+ }
+
+ return FALSE;
+ }
+ else
+ {
+ _dbus_assert (bytes_read == 0);
+
+ _dbus_verbose ("Disconnected from remote app\n");
+ do_io_error (transport);
+
+ return FALSE;
+ }
+}
+
+/* Return value is whether we successfully wrote any bytes */
+static dbus_bool_t
+write_data_from_auth (DBusTransport *transport)
+{
+ DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
+ int bytes_written;
+ const DBusString *buffer;
+
+ if (!_dbus_auth_get_bytes_to_send (transport->auth,
+ &buffer))
+ return FALSE;
+
+ bytes_written = _dbus_write_socket (socket_transport->fd,
+ buffer,
+ 0, _dbus_string_get_length (buffer));
+
+ if (bytes_written > 0)
+ {
+ _dbus_auth_bytes_sent (transport->auth, bytes_written);
+ return TRUE;
+ }
+ else if (bytes_written < 0)
+ {
+ /* EINTR already handled for us */
+
+ if (_dbus_get_is_errno_eagain_or_ewouldblock ())
+ ;
+ else
+ {
+ _dbus_verbose ("Error writing to remote app: %s\n",
+ _dbus_strerror_from_errno ());
+ do_io_error (transport);
+ }
+ }
+
+ return FALSE;
+}
+
+/* FALSE on OOM */
+static dbus_bool_t
+exchange_credentials (DBusTransport *transport,
+ dbus_bool_t do_reading,
+ dbus_bool_t do_writing)
+{
+ DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
+ DBusError error = DBUS_ERROR_INIT;
+
+ _dbus_verbose ("exchange_credentials: do_reading = %d, do_writing = %d\n",
+ do_reading, do_writing);
+
+ if (do_writing && transport->send_credentials_pending)
+ {
+ if (_dbus_send_credentials_socket (socket_transport->fd,
+ &error))
+ {
+ transport->send_credentials_pending = FALSE;
+ }
+ else
+ {
+ _dbus_verbose ("Failed to write credentials: %s\n", error.message);
+ dbus_error_free (&error);
+ do_io_error (transport);
+ }
+ }
+
+ if (do_reading && transport->receive_credentials_pending)
+ {
+ /* FIXME this can fail due to IO error _or_ OOM, broken
+ * (somewhat tricky to fix since the OOM error can be set after
+ * we already read the credentials byte, so basically we need to
+ * separate reading the byte and storing it in the
+ * transport->credentials). Does not really matter for now
+ * because storing in credentials never actually fails on unix.
+ */
+ if (_dbus_read_credentials_socket (socket_transport->fd,
+ transport->credentials,
+ &error))
+ {
+ transport->receive_credentials_pending = FALSE;
+ }
+ else
+ {
+ _dbus_verbose ("Failed to read credentials %s\n", error.message);
+ dbus_error_free (&error);
+ do_io_error (transport);
+ }
+ }
+
+ if (!(transport->send_credentials_pending ||
+ transport->receive_credentials_pending))
+ {
+ if (!_dbus_auth_set_credentials (transport->auth,
+ transport->credentials))
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+static dbus_bool_t
+do_authentication (DBusTransport *transport,
+ dbus_bool_t do_reading,
+ dbus_bool_t do_writing,
+ dbus_bool_t *auth_completed)
+{
+ dbus_bool_t oom;
+ dbus_bool_t orig_auth_state;
+
+ oom = FALSE;
+
+ orig_auth_state = _dbus_transport_get_is_authenticated (transport);
+
+ /* This is essential to avoid the check_write_watch() at the end,
+ * we don't want to add a write watch in do_iteration before
+ * we try writing and get EAGAIN
+ */
+ if (orig_auth_state)
+ {
+ if (auth_completed)
+ *auth_completed = FALSE;
+ return TRUE;
+ }
+
+ _dbus_transport_ref (transport);
+
+ while (!_dbus_transport_get_is_authenticated (transport) &&
+ _dbus_transport_get_is_connected (transport))
+ {
+ if (!exchange_credentials (transport, do_reading, do_writing))
+ {
+ /* OOM */
+ oom = TRUE;
+ goto out;
+ }
+
+ if (transport->send_credentials_pending ||
+ transport->receive_credentials_pending)
+ {
+ _dbus_verbose ("send_credentials_pending = %d receive_credentials_pending = %d\n",
+ transport->send_credentials_pending,
+ transport->receive_credentials_pending);
+ goto out;
+ }
+
+#define TRANSPORT_SIDE(t) ((t)->is_server ? "server" : "client")
+ switch (_dbus_auth_do_work (transport->auth))
+ {
+ case DBUS_AUTH_STATE_WAITING_FOR_INPUT:
+ _dbus_verbose (" %s auth state: waiting for input\n",
+ TRANSPORT_SIDE (transport));
+ if (!do_reading || !read_data_into_auth (transport, &oom))
+ goto out;
+ break;
+
+ case DBUS_AUTH_STATE_WAITING_FOR_MEMORY:
+ _dbus_verbose (" %s auth state: waiting for memory\n",
+ TRANSPORT_SIDE (transport));
+ oom = TRUE;
+ goto out;
+ break;
+
+ case DBUS_AUTH_STATE_HAVE_BYTES_TO_SEND:
+ _dbus_verbose (" %s auth state: bytes to send\n",
+ TRANSPORT_SIDE (transport));
+ if (!do_writing || !write_data_from_auth (transport))
+ goto out;
+ break;
+
+ case DBUS_AUTH_STATE_NEED_DISCONNECT:
+ _dbus_verbose (" %s auth state: need to disconnect\n",
+ TRANSPORT_SIDE (transport));
+ do_io_error (transport);
+ break;
+
+ case DBUS_AUTH_STATE_AUTHENTICATED:
+ _dbus_verbose (" %s auth state: authenticated\n",
+ TRANSPORT_SIDE (transport));
+ break;
+ }
+ }
+
+ out:
+ if (auth_completed)
+ *auth_completed = (orig_auth_state != _dbus_transport_get_is_authenticated (transport));
+
+ check_read_watch (transport);
+ check_write_watch (transport);
+ _dbus_transport_unref (transport);
+
+ if (oom)
+ return FALSE;
+ else
+ return TRUE;
+}
+
+/* returns false on oom */
+static dbus_bool_t
+do_writing (DBusTransport *transport)
+{
+ int total;
+ DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
+ dbus_bool_t oom;
+
+ /* No messages without authentication! */
+ if (!_dbus_transport_get_is_authenticated (transport))
+ {
+ _dbus_verbose ("Not authenticated, not writing anything\n");
+ return TRUE;
+ }
+
+ if (transport->disconnected)
+ {
+ _dbus_verbose ("Not connected, not writing anything\n");
+ return TRUE;
+ }
+
+#if 1
+ _dbus_verbose ("do_writing(), have_messages = %d, fd = %d\n",
+ _dbus_connection_has_messages_to_send_unlocked (transport->connection),
+ socket_transport->fd);
+#endif
+
+ oom = FALSE;
+ total = 0;
+
+ while (!transport->disconnected &&
+ _dbus_connection_has_messages_to_send_unlocked (transport->connection))
+ {
+ int bytes_written;
+ DBusMessage *message;
+ const DBusString *header;
+ const DBusString *body;
+ int header_len, body_len;
+ int total_bytes_to_write;
+
+ if (total > socket_transport->max_bytes_written_per_iteration)
+ {
+ _dbus_verbose ("%d bytes exceeds %d bytes written per iteration, returning\n",
+ total, socket_transport->max_bytes_written_per_iteration);
+ goto out;
+ }
+
+ message = _dbus_connection_get_message_to_send (transport->connection);
+ _dbus_assert (message != NULL);
+ dbus_message_lock (message);
+
+#if 0
+ _dbus_verbose ("writing message %p\n", message);
+#endif
+
+ _dbus_message_get_network_data (message,
+ &header, &body);
+
+ header_len = _dbus_string_get_length (header);
+ body_len = _dbus_string_get_length (body);
+
+ if (_dbus_auth_needs_encoding (transport->auth))
+ {
+ if (_dbus_string_get_length (&socket_transport->encoded_outgoing) == 0)
+ {
+ if (!_dbus_auth_encode_data (transport->auth,
+ header, &socket_transport->encoded_outgoing))
+ {
+ oom = TRUE;
+ goto out;
+ }
+
+ if (!_dbus_auth_encode_data (transport->auth,
+ body, &socket_transport->encoded_outgoing))
+ {
+ _dbus_string_set_length (&socket_transport->encoded_outgoing, 0);
+ oom = TRUE;
+ goto out;
+ }
+ }
+
+ total_bytes_to_write = _dbus_string_get_length (&socket_transport->encoded_outgoing);
+
+#if 0
+ _dbus_verbose ("encoded message is %d bytes\n",
+ total_bytes_to_write);
+#endif
+
+ bytes_written =
+ _dbus_write_socket (socket_transport->fd,
+ &socket_transport->encoded_outgoing,
+ socket_transport->message_bytes_written,
+ total_bytes_to_write - socket_transport->message_bytes_written);
+ }
+ else
+ {
+ total_bytes_to_write = header_len + body_len;
+
+#if 0
+ _dbus_verbose ("message is %d bytes\n",
+ total_bytes_to_write);
+#endif
+
+ if (socket_transport->message_bytes_written < header_len)
+ {
+ bytes_written =
+ _dbus_write_socket_two (socket_transport->fd,
+ header,
+ socket_transport->message_bytes_written,
+ header_len - socket_transport->message_bytes_written,
+ body,
+ 0, body_len);
+ }
+ else
+ {
+ bytes_written =
+ _dbus_write_socket (socket_transport->fd,
+ body,
+ (socket_transport->message_bytes_written - header_len),
+ body_len -
+ (socket_transport->message_bytes_written - header_len));
+ }
+ }
+
+ if (bytes_written < 0)
+ {
+ /* EINTR already handled for us */
+
+ if (_dbus_get_is_errno_eagain_or_ewouldblock ())
+ goto out;
+ else
+ {
+ _dbus_verbose ("Error writing to remote app: %s\n",
+ _dbus_strerror_from_errno ());
+ do_io_error (transport);
+ goto out;
+ }
+ }
+ else
+ {
+ _dbus_verbose (" wrote %d bytes of %d\n", bytes_written,
+ total_bytes_to_write);
+
+ total += bytes_written;
+ socket_transport->message_bytes_written += bytes_written;
+
+ _dbus_assert (socket_transport->message_bytes_written <=
+ total_bytes_to_write);
+
+ if (socket_transport->message_bytes_written == total_bytes_to_write)
+ {
+ socket_transport->message_bytes_written = 0;
+ _dbus_string_set_length (&socket_transport->encoded_outgoing, 0);
+ _dbus_string_compact (&socket_transport->encoded_outgoing, 2048);
+
+ _dbus_connection_message_sent (transport->connection,
+ message);
+ }
+ }
+ }
+
+ out:
+ if (oom)
+ return FALSE;
+ else
+ return TRUE;
+}
+
+/* returns false on out-of-memory */
+static dbus_bool_t
+do_reading (DBusTransport *transport)
+{
+ DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
+ DBusString *buffer;
+ int bytes_read;
+ int total;
+ dbus_bool_t oom;
+
+ _dbus_verbose ("%s: fd = %d\n", _DBUS_FUNCTION_NAME,
+ socket_transport->fd);
+
+ /* No messages without authentication! */
+ if (!_dbus_transport_get_is_authenticated (transport))
+ return TRUE;
+
+ oom = FALSE;
+
+ total = 0;
+
+ again:
+
+ /* See if we've exceeded max messages and need to disable reading */
+ check_read_watch (transport);
+
+ if (total > socket_transport->max_bytes_read_per_iteration)
+ {
+ _dbus_verbose ("%d bytes exceeds %d bytes read per iteration, returning\n",
+ total, socket_transport->max_bytes_read_per_iteration);
+ goto out;
+ }
+
+ _dbus_assert (socket_transport->read_watch != NULL ||
+ transport->disconnected);
+
+ if (transport->disconnected)
+ goto out;
+
+ if (!dbus_watch_get_enabled (socket_transport->read_watch))
+ return TRUE;
+
+ if (_dbus_auth_needs_decoding (transport->auth))
+ {
+ if (_dbus_string_get_length (&socket_transport->encoded_incoming) > 0)
+ bytes_read = _dbus_string_get_length (&socket_transport->encoded_incoming);
+ else
+ bytes_read = _dbus_read_socket (socket_transport->fd,
+ &socket_transport->encoded_incoming,
+ socket_transport->max_bytes_read_per_iteration);
+
+ _dbus_assert (_dbus_string_get_length (&socket_transport->encoded_incoming) ==
+ bytes_read);
+
+ if (bytes_read > 0)
+ {
+ int orig_len;
+
+ _dbus_message_loader_get_buffer (transport->loader,
+ &buffer);
+
+ orig_len = _dbus_string_get_length (buffer);
+
+ if (!_dbus_auth_decode_data (transport->auth,
+ &socket_transport->encoded_incoming,
+ buffer))
+ {
+ _dbus_verbose ("Out of memory decoding incoming data\n");
+ _dbus_message_loader_return_buffer (transport->loader,
+ buffer,
+ _dbus_string_get_length (buffer) - orig_len);
+
+ oom = TRUE;
+ goto out;
+ }
+
+ _dbus_message_loader_return_buffer (transport->loader,
+ buffer,
+ _dbus_string_get_length (buffer) - orig_len);
+
+ _dbus_string_set_length (&socket_transport->encoded_incoming, 0);
+ _dbus_string_compact (&socket_transport->encoded_incoming, 2048);
+ }
+ }
+ else
+ {
+ _dbus_message_loader_get_buffer (transport->loader,
+ &buffer);
+
+ bytes_read = _dbus_read_socket (socket_transport->fd,
+ buffer, socket_transport->max_bytes_read_per_iteration);
+
+ _dbus_message_loader_return_buffer (transport->loader,
+ buffer,
+ bytes_read < 0 ? 0 : bytes_read);
+ }
+
+ if (bytes_read < 0)
+ {
+ /* EINTR already handled for us */
+
+ if (_dbus_get_is_errno_enomem ())
+ {
+ _dbus_verbose ("Out of memory in read()/do_reading()\n");
+ oom = TRUE;
+ goto out;
+ }
+ else if (_dbus_get_is_errno_eagain_or_ewouldblock ())
+ goto out;
+ else
+ {
+ _dbus_verbose ("Error reading from remote app: %s\n",
+ _dbus_strerror_from_errno ());
+ do_io_error (transport);
+ goto out;
+ }
+ }
+ else if (bytes_read == 0)
+ {
+ _dbus_verbose ("Disconnected from remote app\n");
+ do_io_error (transport);
+ goto out;
+ }
+ else
+ {
+ _dbus_verbose (" read %d bytes\n", bytes_read);
+
+ total += bytes_read;
+
+ if (!_dbus_transport_queue_messages (transport))
+ {
+ oom = TRUE;
+ _dbus_verbose (" out of memory when queueing messages we just read in the transport\n");
+ goto out;
+ }
+
+ /* Try reading more data until we get EAGAIN and return, or
+ * exceed max bytes per iteration. If in blocking mode of
+ * course we'll block instead of returning.
+ */
+ goto again;
+ }
+
+ out:
+ if (oom)
+ return FALSE;
+ else
+ return TRUE;
+}
+
+static dbus_bool_t
+socket_handle_watch (DBusTransport *transport,
+ DBusWatch *watch,
+ unsigned int flags)
+{
+ DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
+
+ _dbus_assert (watch == socket_transport->read_watch ||
+ watch == socket_transport->write_watch);
+ _dbus_assert (watch != NULL);
+
+ /* Disconnect in case of an error. In case of hangup do not
+ * disconnect the transport because data can still be in the buffer
+ * and do_reading may need several iteration to read it all (because
+ * of its max_bytes_read_per_iteration limit). The condition where
+ * flags == HANGUP (without READABLE) probably never happen in fact.
+ */
+ if ((flags & DBUS_WATCH_ERROR) ||
+ ((flags & DBUS_WATCH_HANGUP) && !(flags & DBUS_WATCH_READABLE)))
+ {
+ _dbus_verbose ("Hang up or error on watch\n");
+ _dbus_transport_disconnect (transport);
+ return TRUE;
+ }
+
+ if (watch == socket_transport->read_watch &&
+ (flags & DBUS_WATCH_READABLE))
+ {
+ dbus_bool_t auth_finished;
+#if 1
+ _dbus_verbose ("handling read watch %p flags = %x\n",
+ watch, flags);
+#endif
+ if (!do_authentication (transport, TRUE, FALSE, &auth_finished))
+ return FALSE;
+
+ /* We don't want to do a read immediately following
+ * a successful authentication. This is so we
+ * have a chance to propagate the authentication
+ * state further up. Specifically, we need to
+ * process any pending data from the auth object.
+ */
+ if (!auth_finished)
+ {
+ if (!do_reading (transport))
+ {
+ _dbus_verbose ("no memory to read\n");
+ return FALSE;
+ }
+ }
+ else
+ {
+ _dbus_verbose ("Not reading anything since we just completed the authentication\n");
+ }
+ }
+ else if (watch == socket_transport->write_watch &&
+ (flags & DBUS_WATCH_WRITABLE))
+ {
+#if 1
+ _dbus_verbose ("handling write watch, have_outgoing_messages = %d\n",
+ _dbus_connection_has_messages_to_send_unlocked (transport->connection));
+#endif
+ if (!do_authentication (transport, FALSE, TRUE, NULL))
+ return FALSE;
+
+ if (!do_writing (transport))
+ {
+ _dbus_verbose ("no memory to write\n");
+ return FALSE;
+ }
+
+ /* See if we still need the write watch */
+ check_write_watch (transport);
+ }
+#ifdef DBUS_ENABLE_VERBOSE_MODE
+ else
+ {
+ if (watch == socket_transport->read_watch)
+ _dbus_verbose ("asked to handle read watch with non-read condition 0x%x\n",
+ flags);
+ else if (watch == socket_transport->write_watch)
+ _dbus_verbose ("asked to handle write watch with non-write condition 0x%x\n",
+ flags);
+ else
+ _dbus_verbose ("asked to handle watch %p on fd %d that we don't recognize\n",
+ watch, dbus_watch_get_socket (watch));
+ }
+#endif /* DBUS_ENABLE_VERBOSE_MODE */
+
+ return TRUE;
+}
+
+static void
+socket_disconnect (DBusTransport *transport)
+{
+ DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
+
+ _dbus_verbose ("%s\n", _DBUS_FUNCTION_NAME);
+
+ free_watches (transport);
+
+ _dbus_close_socket (socket_transport->fd, NULL);
+ socket_transport->fd = -1;
+}
+
+static dbus_bool_t
+socket_connection_set (DBusTransport *transport)
+{
+ DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
+
+ _dbus_watch_set_handler (socket_transport->write_watch,
+ _dbus_connection_handle_watch,
+ transport->connection, NULL);
+
+ _dbus_watch_set_handler (socket_transport->read_watch,
+ _dbus_connection_handle_watch,
+ transport->connection, NULL);
+
+ if (!_dbus_connection_add_watch_unlocked (transport->connection,
+ socket_transport->write_watch))
+ return FALSE;
+
+ if (!_dbus_connection_add_watch_unlocked (transport->connection,
+ socket_transport->read_watch))
+ {
+ _dbus_connection_remove_watch_unlocked (transport->connection,
+ socket_transport->write_watch);
+ return FALSE;
+ }
+
+ check_read_watch (transport);
+ check_write_watch (transport);
+
+ return TRUE;
+}
+
+/**
+ * @todo We need to have a way to wake up the select sleep if
+ * a new iteration request comes in with a flag (read/write) that
+ * we're not currently serving. Otherwise a call that just reads
+ * could block a write call forever (if there are no incoming
+ * messages).
+ */
+static void
+socket_do_iteration (DBusTransport *transport,
+ unsigned int flags,
+ int timeout_milliseconds)
+{
+ DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
+ DBusPollFD poll_fd;
+ int poll_res;
+ int poll_timeout;
+
+ _dbus_verbose (" iteration flags = %s%s timeout = %d read_watch = %p write_watch = %p fd = %d\n",
+ flags & DBUS_ITERATION_DO_READING ? "read" : "",
+ flags & DBUS_ITERATION_DO_WRITING ? "write" : "",
+ timeout_milliseconds,
+ socket_transport->read_watch,
+ socket_transport->write_watch,
+ socket_transport->fd);
+
+ /* the passed in DO_READING/DO_WRITING flags indicate whether to
+ * read/write messages, but regardless of those we may need to block
+ * for reading/writing to do auth. But if we do reading for auth,
+ * we don't want to read any messages yet if not given DO_READING.
+ */
+
+ poll_fd.fd = socket_transport->fd;
+ poll_fd.events = 0;
+
+ if (_dbus_transport_get_is_authenticated (transport))
+ {
+ /* This is kind of a hack; if we have stuff to write, then try
+ * to avoid the poll. This is probably about a 5% speedup on an
+ * echo client/server.
+ *
+ * If both reading and writing were requested, we want to avoid this
+ * since it could have funky effects:
+ * - both ends spinning waiting for the other one to read
+ * data so they can finish writing
+ * - prioritizing all writing ahead of reading
+ */
+ if ((flags & DBUS_ITERATION_DO_WRITING) &&
+ !(flags & (DBUS_ITERATION_DO_READING | DBUS_ITERATION_BLOCK)) &&
+ !transport->disconnected &&
+ _dbus_connection_has_messages_to_send_unlocked (transport->connection))
+ {
+ do_writing (transport);
+
+ if (transport->disconnected ||
+ !_dbus_connection_has_messages_to_send_unlocked (transport->connection))
+ goto out;
+ }
+
+ /* If we get here, we decided to do the poll() after all */
+ _dbus_assert (socket_transport->read_watch);
+ if (flags & DBUS_ITERATION_DO_READING)
+ poll_fd.events |= _DBUS_POLLIN;
+
+ _dbus_assert (socket_transport->write_watch);
+ if (flags & DBUS_ITERATION_DO_WRITING)
+ poll_fd.events |= _DBUS_POLLOUT;
+ }
+ else
+ {
+ DBusAuthState auth_state;
+
+ auth_state = _dbus_auth_do_work (transport->auth);
+
+ if (transport->receive_credentials_pending ||
+ auth_state == DBUS_AUTH_STATE_WAITING_FOR_INPUT)
+ poll_fd.events |= _DBUS_POLLIN;
+
+ if (transport->send_credentials_pending ||
+ auth_state == DBUS_AUTH_STATE_HAVE_BYTES_TO_SEND)
+ poll_fd.events |= _DBUS_POLLOUT;
+ }
+
+ if (poll_fd.events)
+ {
+ if (flags & DBUS_ITERATION_BLOCK)
+ poll_timeout = timeout_milliseconds;
+ else
+ poll_timeout = 0;
+
+ /* For blocking selects we drop the connection lock here
+ * to avoid blocking out connection access during a potentially
+ * indefinite blocking call. The io path is still protected
+ * by the io_path_cond condvar, so we won't reenter this.
+ */
+ if (flags & DBUS_ITERATION_BLOCK)
+ {
+ _dbus_verbose ("unlock %s pre poll\n", _DBUS_FUNCTION_NAME);
+ _dbus_connection_unlock (transport->connection);
+ }
+
+ again:
+ poll_res = _dbus_poll (&poll_fd, 1, poll_timeout);
+
+ if (poll_res < 0 && _dbus_get_is_errno_eintr ())
+ goto again;
+
+ if (flags & DBUS_ITERATION_BLOCK)
+ {
+ _dbus_verbose ("lock %s post poll\n", _DBUS_FUNCTION_NAME);
+ _dbus_connection_lock (transport->connection);
+ }
+
+ if (poll_res >= 0)
+ {
+ if (poll_res == 0)
+ poll_fd.revents = 0; /* some concern that posix does not guarantee this;
+ * valgrind flags it as an error. though it probably
+ * is guaranteed on linux at least.
+ */
+
+ if (poll_fd.revents & _DBUS_POLLERR)
+ do_io_error (transport);
+ else
+ {
+ dbus_bool_t need_read = (poll_fd.revents & _DBUS_POLLIN) > 0;
+ dbus_bool_t need_write = (poll_fd.revents & _DBUS_POLLOUT) > 0;
+ dbus_bool_t authentication_completed;
+
+ _dbus_verbose ("in iteration, need_read=%d need_write=%d\n",
+ need_read, need_write);
+ do_authentication (transport, need_read, need_write,
+ &authentication_completed);
+
+ /* See comment in socket_handle_watch. */
+ if (authentication_completed)
+ goto out;
+
+ if (need_read && (flags & DBUS_ITERATION_DO_READING))
+ do_reading (transport);
+ if (need_write && (flags & DBUS_ITERATION_DO_WRITING))
+ do_writing (transport);
+ }
+ }
+ else
+ {
+ _dbus_verbose ("Error from _dbus_poll(): %s\n",
+ _dbus_strerror_from_errno ());
+ }
+ }
+
+
+ out:
+ /* We need to install the write watch only if we did not
+ * successfully write everything. Note we need to be careful that we
+ * don't call check_write_watch *before* do_writing, since it's
+ * inefficient to add the write watch, and we can avoid it most of
+ * the time since we can write immediately.
+ *
+ * However, we MUST always call check_write_watch(); DBusConnection code
+ * relies on the fact that running an iteration will notice that
+ * messages are pending.
+ */
+ check_write_watch (transport);
+
+ _dbus_verbose (" ... leaving do_iteration()\n");
+}
+
+static void
+socket_live_messages_changed (DBusTransport *transport)
+{
+ /* See if we should look for incoming messages again */
+ check_read_watch (transport);
+}
+
+
+static dbus_bool_t
+socket_get_socket_fd (DBusTransport *transport,
+ int *fd_p)
+{
+ DBusTransportSocket *socket_transport = (DBusTransportSocket*) transport;
+
+ *fd_p = socket_transport->fd;
+
+ return TRUE;
+}
+
+static const DBusTransportVTable socket_vtable = {
+ socket_finalize,
+ socket_handle_watch,
+ socket_disconnect,
+ socket_connection_set,
+ socket_do_iteration,
+ socket_live_messages_changed,
+ socket_get_socket_fd
+};
+
+/**
+ * Creates a new transport for the given socket file descriptor. The file
+ * descriptor must be nonblocking (use _dbus_set_fd_nonblocking() to
+ * make it so). This function is shared by various transports that
+ * boil down to a full duplex file descriptor.
+ *
+ * @param fd the file descriptor.
+ * @param server_guid non-#NULL if this transport is on the server side of a connection
+ * @param address the transport's address
+ * @returns the new transport, or #NULL if no memory.
+ */
+DBusTransport*
+_dbus_transport_new_for_socket (int fd,
+ const DBusString *server_guid,
+ const DBusString *address)
+{
+ DBusTransportSocket *socket_transport;
+
+ socket_transport = dbus_new0 (DBusTransportSocket, 1);
+ if (socket_transport == NULL)
+ return NULL;
+
+ if (!_dbus_string_init (&socket_transport->encoded_outgoing))
+ goto failed_0;
+
+ if (!_dbus_string_init (&socket_transport->encoded_incoming))
+ goto failed_1;
+
+ socket_transport->write_watch = _dbus_watch_new (fd,
+ DBUS_WATCH_WRITABLE,
+ FALSE,
+ NULL, NULL, NULL);
+ if (socket_transport->write_watch == NULL)
+ goto failed_2;
+
+ socket_transport->read_watch = _dbus_watch_new (fd,
+ DBUS_WATCH_READABLE,
+ FALSE,
+ NULL, NULL, NULL);
+ if (socket_transport->read_watch == NULL)
+ goto failed_3;
+
+ if (!_dbus_transport_init_base (&socket_transport->base,
+ &socket_vtable,
+ server_guid, address))
+ goto failed_4;
+
+ socket_transport->fd = fd;
+ socket_transport->message_bytes_written = 0;
+
+ /* These values should probably be tunable or something. */
+ socket_transport->max_bytes_read_per_iteration = 2048;
+ socket_transport->max_bytes_written_per_iteration = 2048;
+
+ return (DBusTransport*) socket_transport;
+
+ failed_4:
+ _dbus_watch_unref (socket_transport->read_watch);
+ failed_3:
+ _dbus_watch_unref (socket_transport->write_watch);
+ failed_2:
+ _dbus_string_free (&socket_transport->encoded_incoming);
+ failed_1:
+ _dbus_string_free (&socket_transport->encoded_outgoing);
+ failed_0:
+ dbus_free (socket_transport);
+ return NULL;
+}
+
+/**
+ * Creates a new transport for the given hostname and port.
+ * If host is NULL, it will default to localhost
+ *
+ * @param host the host to connect to
+ * @param port the port to connect to
+ * @param family the address family to connect to
+ * @param error location to store reason for failure.
+ * @returns a new transport, or #NULL on failure.
+ */
+DBusTransport*
+_dbus_transport_new_for_tcp_socket (const char *host,
+ const char *port,
+ const char *family,
+ DBusError *error)
+{
+ int fd;
+ DBusTransport *transport;
+ DBusString address;
+
+ _DBUS_ASSERT_ERROR_IS_CLEAR (error);
+
+ if (!_dbus_string_init (&address))
+ {
+ dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
+ return NULL;
+ }
+
+ if (host == NULL)
+ host = "localhost";
+
+ if (!_dbus_string_append (&address, "tcp:"))
+ goto error;
+
+ if (!_dbus_string_append (&address, "host=") ||
+ !_dbus_string_append (&address, host))
+ goto error;
+
+ if (!_dbus_string_append (&address, ",port=") ||
+ !_dbus_string_append (&address, port))
+ goto error;
+
+ if (family != NULL &&
+ (!_dbus_string_append (&address, "family=") ||
+ !_dbus_string_append (&address, family)))
+ goto error;
+
+ fd = _dbus_connect_tcp_socket (host, port, family, error);
+ if (fd < 0)
+ {
+ _DBUS_ASSERT_ERROR_IS_SET (error);
+ _dbus_string_free (&address);
+ return NULL;
+ }
+
+ _dbus_fd_set_close_on_exec (fd);
+
+ _dbus_verbose ("Successfully connected to tcp socket %s:%s\n",
+ host, port);
+
+ transport = _dbus_transport_new_for_socket (fd, NULL, &address);
+ if (transport == NULL)
+ {
+ dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
+ _dbus_close_socket (fd, NULL);
+ _dbus_string_free (&address);
+ fd = -1;
+ }
+
+ _dbus_string_free (&address);
+
+ return transport;
+
+error:
+ _dbus_string_free (&address);
+ dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
+ return NULL;
+}
+
+/**
+ * Opens a TCP socket transport.
+ *
+ * @param entry the address entry to try opening as a tcp transport.
+ * @param transport_p return location for the opened transport
+ * @param error error to be set
+ * @returns result of the attempt
+ */
+DBusTransportOpenResult
+_dbus_transport_open_socket(DBusAddressEntry *entry,
+ DBusTransport **transport_p,
+ DBusError *error)
+{
+ const char *method;
+
+ method = dbus_address_entry_get_method (entry);
+ _dbus_assert (method != NULL);
+
+ if (strcmp (method, "tcp") == 0)
+ {
+ const char *host = dbus_address_entry_get_value (entry, "host");
+ const char *port = dbus_address_entry_get_value (entry, "port");
+ const char *family = dbus_address_entry_get_value (entry, "family");
+
+ if (port == NULL)
+ {
+ _dbus_set_bad_address (error, "tcp", "port", NULL);
+ return DBUS_TRANSPORT_OPEN_BAD_ADDRESS;
+ }
+
+ *transport_p = _dbus_transport_new_for_tcp_socket (host, port, family, error);
+ if (*transport_p == NULL)
+ {
+ _DBUS_ASSERT_ERROR_IS_SET (error);
+ return DBUS_TRANSPORT_OPEN_DID_NOT_CONNECT;
+ }
+ else
+ {
+ _DBUS_ASSERT_ERROR_IS_CLEAR (error);
+ return DBUS_TRANSPORT_OPEN_OK;
+ }
+ }
+ else
+ {
+ _DBUS_ASSERT_ERROR_IS_CLEAR (error);
+ return DBUS_TRANSPORT_OPEN_NOT_HANDLED;
+ }
+}
+
+/** @} */
+
projects / monky / blobdiff