/* 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_try_to_authenticate (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 = %" DBUS_SOCKET_FORMAT "\n", _dbus_connection_has_messages_to_send_unlocked (transport->connection), _dbus_socket_printable (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; int saved_errno; 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)) { /* Does fd passing even make sense with encoded data? */ _dbus_assert(!DBUS_TRANSPORT_CAN_SEND_UNIX_FD(transport)); 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); saved_errno = _dbus_save_socket_errno (); } else { total_bytes_to_write = header_len + body_len; #if 0 _dbus_verbose ("message is %d bytes\n", total_bytes_to_write); #endif #ifdef HAVE_UNIX_FD_PASSING if (socket_transport->message_bytes_written <= 0 && DBUS_TRANSPORT_CAN_SEND_UNIX_FD(transport)) { /* Send the fds along with the first byte of the message */ const int *unix_fds; unsigned n; _dbus_message_get_unix_fds(message, &unix_fds, &n); bytes_written = _dbus_write_socket_with_unix_fds_two (socket_transport->fd, header, socket_transport->message_bytes_written, header_len - socket_transport->message_bytes_written, body, 0, body_len, unix_fds, n); saved_errno = _dbus_save_socket_errno (); if (bytes_written > 0 && n > 0) _dbus_verbose("Wrote %i unix fds\n", n); } else #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)); } saved_errno = _dbus_save_socket_errno (); } } if (bytes_written < 0) { /* EINTR already handled for us */ /* If the other end closed the socket with close() or shutdown(), we * receive EPIPE here but we must not close the socket yet: there * might still be some data to read. See: * http://lists.freedesktop.org/archives/dbus/2008-March/009526.html */ if (_dbus_get_is_errno_eagain_or_ewouldblock (saved_errno) || _dbus_get_is_errno_epipe (saved_errno)) goto out; /* Since Linux commit 25888e (from 2.6.37-rc4, Nov 2010), sendmsg() * on Unix sockets returns -1 errno=ETOOMANYREFS when the passfd * mechanism (SCM_RIGHTS) is used recursively with a recursion level * of maximum 4. The kernel does not have an API to check whether * the passed fds can be forwarded and it can change asynchronously. * See: * https://bugs.freedesktop.org/show_bug.cgi?id=80163 */ else if (_dbus_get_is_errno_etoomanyrefs (saved_errno)) { /* We only send fds in the first byte of the message. * ETOOMANYREFS cannot happen after. */ _dbus_assert (socket_transport->message_bytes_written == 0); _dbus_verbose (" discard message of %d bytes due to ETOOMANYREFS\n", 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); /* The message was not actually sent but it needs to be removed * from the outgoing queue */ _dbus_connection_message_sent_unlocked (transport->connection, message); } else { _dbus_verbose ("Error writing to remote app: %s\n", _dbus_strerror (saved_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_unlocked (transport->connection, message); } } } out: 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_try_to_authenticate (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)) { /* Does fd passing even make sense with encoded data? */ _dbus_assert(!DBUS_TRANSPORT_CAN_SEND_UNIX_FD(transport)); 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 #ifdef HAVE_UNIX_FD_PASSING if (socket_transport->message_bytes_written <= 0 && DBUS_TRANSPORT_CAN_SEND_UNIX_FD(transport)) { /* Send the fds along with the first byte of the message */ const int *unix_fds; unsigned n; _dbus_message_get_unix_fds(message, &unix_fds, &n); bytes_written = _dbus_write_socket_with_unix_fds_two (socket_transport->fd, header, socket_transport->message_bytes_written, header_len - socket_transport->message_bytes_written, body, 0, body_len, unix_fds, n); if (bytes_written > 0 && n > 0) _dbus_verbose("Wrote %i unix fds\n", n); } else #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 */ /* For some discussion of why we also ignore EPIPE here, see * http://lists.freedesktop.org/archives/dbus/2008-March/009526.html */ if (_dbus_get_is_errno_eagain_or_ewouldblock () || _dbus_get_is_errno_epipe ()) 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_unlocked (transport->connection, message); } } } out: if (oom) return FALSE; else return TRUE; }