/* -*- mode: C; c-file-style: "gnu" -*- */
/* dbus-transport-unix.c UNIX socket subclasses of DBusTransport
*
- * Copyright (C) 2002 Red Hat Inc.
+ * Copyright (C) 2002, 2003 Red Hat Inc.
*
- * Licensed under the Academic Free License version 1.2
+ * Licensed under the Academic Free License version 2.0
*
* 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
#include "dbus-transport-unix.h"
#include "dbus-transport-protected.h"
#include "dbus-watch.h"
-#include <sys/types.h>
-#include <sys/time.h>
-#include <unistd.h>
/**
{
DBusTransport base; /**< Parent instance */
int fd; /**< File descriptor. */
- DBusWatch *watch; /**< Watch for readability. */
+ DBusWatch *read_watch; /**< Watch for readability. */
DBusWatch *write_watch; /**< Watch for writability. */
int max_bytes_read_per_iteration; /**< To avoid blocking too long. */
* outgoing message that have
* been written.
*/
- DBusString encoded_message; /**< Encoded version of current
+ DBusString encoded_outgoing; /**< Encoded version of current
* outgoing message.
*/
+ DBusString encoded_incoming; /**< Encoded version of current
+ * incoming data.
+ */
};
static void
{
DBusTransportUnix *unix_transport = (DBusTransportUnix*) transport;
- if (unix_transport->watch)
+ if (unix_transport->read_watch)
{
if (transport->connection)
_dbus_connection_remove_watch (transport->connection,
- unix_transport->watch);
- _dbus_watch_invalidate (unix_transport->watch);
- _dbus_watch_unref (unix_transport->watch);
- unix_transport->watch = NULL;
+ unix_transport->read_watch);
+ _dbus_watch_invalidate (unix_transport->read_watch);
+ _dbus_watch_unref (unix_transport->read_watch);
+ unix_transport->read_watch = NULL;
}
if (unix_transport->write_watch)
free_watches (transport);
- _dbus_string_free (&unix_transport->encoded_message);
+ _dbus_string_free (&unix_transport->encoded_outgoing);
+ _dbus_string_free (&unix_transport->encoded_incoming);
_dbus_transport_finalize_base (transport);
- _dbus_assert (unix_transport->watch == NULL);
+ _dbus_assert (unix_transport->read_watch == NULL);
_dbus_assert (unix_transport->write_watch == NULL);
dbus_free (transport);
if (transport->connection == NULL)
return;
+
+ if (transport->disconnected)
+ {
+ _dbus_assert (unix_transport->write_watch == NULL);
+ return;
+ }
_dbus_transport_ref (transport);
need_write_watch = transport->send_credentials_pending ||
_dbus_auth_do_work (transport->auth) == DBUS_AUTH_STATE_HAVE_BYTES_TO_SEND;
- if (transport->disconnected)
- need_write_watch = FALSE;
-
- if (need_write_watch &&
- unix_transport->write_watch == NULL)
- {
- unix_transport->write_watch =
- _dbus_watch_new (unix_transport->fd,
- DBUS_WATCH_WRITABLE);
+ _dbus_connection_toggle_watch (transport->connection,
+ unix_transport->write_watch,
+ need_write_watch);
- /* we can maybe add it some other time, just silently bomb */
- if (unix_transport->write_watch == NULL)
- return;
+ _dbus_transport_unref (transport);
+}
- if (!_dbus_connection_add_watch (transport->connection,
- unix_transport->write_watch))
- {
- _dbus_watch_invalidate (unix_transport->write_watch);
- _dbus_watch_unref (unix_transport->write_watch);
- unix_transport->write_watch = NULL;
- }
- }
- else if (!need_write_watch &&
- unix_transport->write_watch != NULL)
+static void
+check_read_watch (DBusTransport *transport)
+{
+ DBusTransportUnix *unix_transport = (DBusTransportUnix*) transport;
+ dbus_bool_t need_read_watch;
+
+ if (transport->connection == NULL)
+ return;
+
+ if (transport->disconnected)
{
- _dbus_connection_remove_watch (transport->connection,
- unix_transport->write_watch);
- _dbus_watch_invalidate (unix_transport->write_watch);
- _dbus_watch_unref (unix_transport->write_watch);
- unix_transport->write_watch = NULL;
+ _dbus_assert (unix_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
+ need_read_watch = transport->receive_credentials_pending ||
+ _dbus_auth_do_work (transport->auth) == DBUS_AUTH_STATE_WAITING_FOR_INPUT;
+
+ _dbus_connection_toggle_watch (transport->connection,
+ unix_transport->read_watch,
+ need_read_watch);
_dbus_transport_unref (transport);
}
_dbus_transport_unref (transport);
}
-static void
-queue_messages (DBusTransport *transport)
-{
- DBusMessage *message;
-
- /* Queue any messages */
- while ((message = _dbus_message_loader_pop_message (transport->loader)))
- {
- _dbus_verbose ("queueing received message %p\n", message);
-
- _dbus_connection_queue_received_message (transport->connection,
- message);
- dbus_message_unref (message);
- }
-
- if (_dbus_message_loader_get_is_corrupted (transport->loader))
- {
- _dbus_verbose ("Corrupted message stream, disconnecting\n");
- do_io_error (transport);
- }
-}
-
/* return value is whether we successfully read any new data. */
static dbus_bool_t
-read_data_into_auth (DBusTransport *transport)
+read_data_into_auth (DBusTransport *transport,
+ dbus_bool_t *oom)
{
DBusTransportUnix *unix_transport = (DBusTransportUnix*) transport;
- DBusString buffer;
+ DBusString *buffer;
int bytes_read;
- if (!_dbus_string_init (&buffer, _DBUS_INT_MAX))
- {
- /* just disconnect if we don't have memory
- * to do an authentication
- */
- _dbus_verbose ("No memory for authentication\n");
- do_io_error (transport);
- return FALSE;
- }
+ *oom = FALSE;
+
+ _dbus_auth_get_buffer (transport->auth, &buffer);
bytes_read = _dbus_read (unix_transport->fd,
- &buffer, unix_transport->max_bytes_read_per_iteration);
+ buffer, unix_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);
-
- if (_dbus_auth_bytes_received (transport->auth,
- &buffer))
- {
- _dbus_string_free (&buffer);
- return TRUE; /* We did read some data! woo! */
- }
- else
- {
- /* just disconnect if we don't have memory to do an
- * authentication, don't fool with trying to save the buffer
- * and who knows what.
- */
- _dbus_verbose ("No memory for authentication\n");
- do_io_error (transport);
- }
+
+ return TRUE;
}
else if (bytes_read < 0)
{
/* EINTR already handled for us */
-
- if (errno == EAGAIN ||
- errno == EWOULDBLOCK)
+
+ if (errno == ENOMEM)
+ {
+ *oom = TRUE;
+ }
+ else if (errno == EAGAIN ||
+ errno == EWOULDBLOCK)
; /* do nothing, just return FALSE below */
else
{
_dbus_strerror (errno));
do_io_error (transport);
}
+
+ return FALSE;
}
- else if (bytes_read == 0)
+ else
{
+ _dbus_assert (bytes_read == 0);
+
_dbus_verbose ("Disconnected from remote app\n");
- do_io_error (transport);
+ do_io_error (transport);
+
+ return FALSE;
}
-
- _dbus_string_free (&buffer);
- return FALSE;
}
/* Return value is whether we successfully wrote any bytes */
}
static void
-recover_unused_bytes (DBusTransport *transport)
-{
-
- if (_dbus_auth_needs_decoding (transport->auth))
- {
- DBusString plaintext;
- DBusString encoded;
- DBusString *buffer;
- int orig_len;
-
- if (!_dbus_string_init (&plaintext, _DBUS_INT_MAX))
- goto nomem;
-
- if (!_dbus_string_init (&encoded, _DBUS_INT_MAX))
- {
- _dbus_string_free (&plaintext);
- goto nomem;
- }
-
- if (!_dbus_auth_get_unused_bytes (transport->auth,
- &encoded))
- {
- _dbus_string_free (&plaintext);
- _dbus_string_free (&encoded);
- goto nomem;
- }
-
- if (!_dbus_auth_decode_data (transport->auth,
- &encoded, &plaintext))
- {
- _dbus_string_free (&plaintext);
- _dbus_string_free (&encoded);
- goto nomem;
- }
-
- _dbus_message_loader_get_buffer (transport->loader,
- &buffer);
-
- orig_len = _dbus_string_get_length (buffer);
-
- if (!_dbus_string_move (&plaintext, 0, buffer,
- orig_len))
- {
- _dbus_string_free (&plaintext);
- _dbus_string_free (&encoded);
- goto nomem;
- }
-
- _dbus_verbose (" %d unused bytes sent to message loader\n",
- _dbus_string_get_length (buffer) -
- orig_len);
-
- _dbus_message_loader_return_buffer (transport->loader,
- buffer,
- _dbus_string_get_length (buffer) -
- orig_len);
-
- _dbus_string_free (&plaintext);
- _dbus_string_free (&encoded);
- }
- else
- {
- DBusString *buffer;
- int orig_len;
-
- _dbus_message_loader_get_buffer (transport->loader,
- &buffer);
-
- orig_len = _dbus_string_get_length (buffer);
-
- if (!_dbus_auth_get_unused_bytes (transport->auth,
- buffer))
- goto nomem;
-
- _dbus_verbose (" %d unused bytes sent to message loader\n",
- _dbus_string_get_length (buffer) -
- orig_len);
-
- _dbus_message_loader_return_buffer (transport->loader,
- buffer,
- _dbus_string_get_length (buffer) -
- orig_len);
- }
-
- queue_messages (transport);
-
- return;
-
- nomem:
- _dbus_verbose ("Not enough memory to transfer unused bytes from auth conversation\n");
- do_io_error (transport);
-}
-
-static void
exchange_credentials (DBusTransport *transport,
dbus_bool_t do_reading,
dbus_bool_t do_writing)
}
}
-static void
+static dbus_bool_t
do_authentication (DBusTransport *transport,
dbus_bool_t do_reading,
dbus_bool_t do_writing)
-{
+{
+ dbus_bool_t oom;
+
_dbus_transport_ref (transport);
+
+ oom = FALSE;
while (!_dbus_transport_get_is_authenticated (transport) &&
_dbus_transport_get_is_connected (transport))
- {
+ {
exchange_credentials (transport, do_reading, do_writing);
if (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 (" auth state: waiting for input\n");
- if (!do_reading || !read_data_into_auth (transport))
+ _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:
- /* Screw it, just disconnect */
- _dbus_verbose (" auth state: waiting for memory\n");
- do_io_error (transport);
+ _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 (" auth state: bytes to send\n");
+ _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 (" auth state: need to disconnect\n");
+ _dbus_verbose (" %s auth state: need to disconnect\n",
+ TRANSPORT_SIDE (transport));
do_io_error (transport);
break;
- case DBUS_AUTH_STATE_AUTHENTICATED_WITH_UNUSED_BYTES:
- _dbus_verbose (" auth state: auth with unused bytes\n");
- recover_unused_bytes (transport);
- break;
-
case DBUS_AUTH_STATE_AUTHENTICATED:
- _dbus_verbose (" auth state: authenticated\n");
+ _dbus_verbose (" %s auth state: authenticated\n",
+ TRANSPORT_SIDE (transport));
break;
}
}
-
+
out:
+ check_read_watch (transport);
check_write_watch (transport);
_dbus_transport_unref (transport);
+
+ if (oom)
+ return FALSE;
+ else
+ return TRUE;
}
-static void
+/* returns false on oom */
+static dbus_bool_t
do_writing (DBusTransport *transport)
{
int total;
DBusTransportUnix *unix_transport = (DBusTransportUnix*) transport;
-
+ dbus_bool_t oom;
+
/* No messages without authentication! */
if (!_dbus_transport_get_is_authenticated (transport))
- return;
+ {
+ _dbus_verbose ("Not authenticated, not writing anything\n");
+ return TRUE;
+ }
if (transport->disconnected)
- return;
+ {
+ _dbus_verbose ("Not connected, not writing anything\n");
+ return TRUE;
+ }
+
+#if 0
+ _dbus_verbose ("do_writing(), have_messages = %d\n",
+ _dbus_connection_have_messages_to_send (transport->connection));
+#endif
+ oom = FALSE;
total = 0;
while (!transport->disconnected &&
total, unix_transport->max_bytes_written_per_iteration);
goto out;
}
+
+ if (!dbus_watch_get_enabled (unix_transport->write_watch))
+ {
+ _dbus_verbose ("write watch disabled, not writing more stuff\n");
+ 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);
if (_dbus_auth_needs_encoding (transport->auth))
{
- if (_dbus_string_get_length (&unix_transport->encoded_message) == 0)
+ if (_dbus_string_get_length (&unix_transport->encoded_outgoing) == 0)
{
if (!_dbus_auth_encode_data (transport->auth,
- header, &unix_transport->encoded_message))
- goto out;
+ header, &unix_transport->encoded_outgoing))
+ {
+ oom = TRUE;
+ goto out;
+ }
if (!_dbus_auth_encode_data (transport->auth,
- body, &unix_transport->encoded_message))
+ body, &unix_transport->encoded_outgoing))
{
- _dbus_string_set_length (&unix_transport->encoded_message, 0);
+ _dbus_string_set_length (&unix_transport->encoded_outgoing, 0);
+ oom = TRUE;
goto out;
}
}
- total_bytes_to_write = _dbus_string_get_length (&unix_transport->encoded_message);
+ total_bytes_to_write = _dbus_string_get_length (&unix_transport->encoded_outgoing);
+#if 0
_dbus_verbose ("encoded message is %d bytes\n",
total_bytes_to_write);
+#endif
bytes_written =
_dbus_write (unix_transport->fd,
- &unix_transport->encoded_message,
+ &unix_transport->encoded_outgoing,
unix_transport->message_bytes_written,
total_bytes_to_write - unix_transport->message_bytes_written);
}
{
total_bytes_to_write = header_len + body_len;
+#if 0
_dbus_verbose ("message is %d bytes\n",
total_bytes_to_write);
+#endif
if (unix_transport->message_bytes_written < header_len)
{
}
}
else
- {
+ {
_dbus_verbose (" wrote %d bytes of %d\n", bytes_written,
total_bytes_to_write);
if (unix_transport->message_bytes_written == total_bytes_to_write)
{
unix_transport->message_bytes_written = 0;
- _dbus_string_set_length (&unix_transport->encoded_message, 0);
+ _dbus_string_set_length (&unix_transport->encoded_outgoing, 0);
_dbus_connection_message_sent (transport->connection,
message);
}
out:
- return; /* I think some C compilers require a statement after a label */
+ if (oom)
+ return FALSE;
+ else
+ return TRUE;
}
-static void
+/* returns false on out-of-memory */
+static dbus_bool_t
do_reading (DBusTransport *transport)
{
DBusTransportUnix *unix_transport = (DBusTransportUnix*) transport;
DBusString *buffer;
int bytes_read;
int total;
+ dbus_bool_t oom;
/* No messages without authentication! */
if (!_dbus_transport_get_is_authenticated (transport))
- return;
+ 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 > unix_transport->max_bytes_read_per_iteration)
{
_dbus_verbose ("%d bytes exceeds %d bytes read per iteration, returning\n",
goto out;
}
+ _dbus_assert (unix_transport->read_watch != NULL ||
+ transport->disconnected);
+
if (transport->disconnected)
goto out;
+ if (!dbus_watch_get_enabled (unix_transport->read_watch))
+ return TRUE;
+
if (_dbus_auth_needs_decoding (transport->auth))
{
- DBusString encoded;
-
- if (!_dbus_string_init (&encoded, _DBUS_INT_MAX))
- goto out; /* not enough memory for the moment */
-
- bytes_read = _dbus_read (unix_transport->fd,
- &encoded,
- unix_transport->max_bytes_read_per_iteration);
+ if (_dbus_string_get_length (&unix_transport->encoded_incoming) > 0)
+ bytes_read = _dbus_string_get_length (&unix_transport->encoded_incoming);
+ else
+ bytes_read = _dbus_read (unix_transport->fd,
+ &unix_transport->encoded_incoming,
+ unix_transport->max_bytes_read_per_iteration);
+ _dbus_assert (_dbus_string_get_length (&unix_transport->encoded_incoming) ==
+ bytes_read);
+
if (bytes_read > 0)
{
int orig_len;
orig_len = _dbus_string_get_length (buffer);
if (!_dbus_auth_decode_data (transport->auth,
- &encoded, buffer))
+ &unix_transport->encoded_incoming,
+ buffer))
{
- /* FIXME argh, we are really fucked here - nowhere to
- * put "encoded" while we wait for more memory. Just
- * screw it for now and disconnect. The failure may be
- * due to badly-encoded data instead of lack of memory
- * anyhow.
- */
- _dbus_verbose ("Disconnected from remote app due to failure decoding data\n");
- do_io_error (transport);
+ _dbus_verbose ("Out of memory decoding incoming data\n");
+ oom = TRUE;
+ goto out;
}
_dbus_message_loader_return_buffer (transport->loader,
buffer,
_dbus_string_get_length (buffer) - orig_len);
- }
- _dbus_string_free (&encoded);
+ _dbus_string_set_length (&unix_transport->encoded_incoming, 0);
+ }
}
else
{
if (bytes_read < 0)
{
/* EINTR already handled for us */
-
- if (errno == EAGAIN ||
- errno == EWOULDBLOCK)
+
+ if (errno == ENOMEM)
+ {
+ _dbus_verbose ("Out of memory in read()/do_reading()\n");
+ oom = TRUE;
+ goto out;
+ }
+ else if (errno == EAGAIN ||
+ errno == EWOULDBLOCK)
goto out;
else
{
total += bytes_read;
- queue_messages (transport);
+ 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
}
out:
- return; /* I think some C compilers require a statement after a label */
+ if (oom)
+ return FALSE;
+ else
+ return TRUE;
}
-static void
+static dbus_bool_t
unix_handle_watch (DBusTransport *transport,
DBusWatch *watch,
unsigned int flags)
{
DBusTransportUnix *unix_transport = (DBusTransportUnix*) transport;
- _dbus_assert (watch == unix_transport->watch ||
+ _dbus_assert (watch == unix_transport->read_watch ||
watch == unix_transport->write_watch);
- if (flags & (DBUS_WATCH_HANGUP | DBUS_WATCH_ERROR))
+ /* 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;
+ return TRUE;
}
- if (watch == unix_transport->watch &&
+ if (watch == unix_transport->read_watch &&
(flags & DBUS_WATCH_READABLE))
{
- _dbus_verbose ("handling read watch\n");
- do_authentication (transport, TRUE, FALSE);
- do_reading (transport);
+#if 0
+ _dbus_verbose ("handling read watch (%x)\n", flags);
+#endif
+ if (!do_authentication (transport, TRUE, FALSE))
+ return FALSE;
+
+ if (!do_reading (transport))
+ {
+ _dbus_verbose ("no memory to read\n");
+ return FALSE;
+ }
}
else if (watch == unix_transport->write_watch &&
(flags & DBUS_WATCH_WRITABLE))
{
- _dbus_verbose ("handling write watch\n");
- do_authentication (transport, FALSE, TRUE);
- do_writing (transport);
+#if 0
+ _dbus_verbose ("handling write watch, messages_need_sending = %d\n",
+ transport->messages_need_sending);
+#endif
+ if (!do_authentication (transport, FALSE, TRUE))
+ return FALSE;
+
+ if (!do_writing (transport))
+ {
+ _dbus_verbose ("no memory to write\n");
+ return FALSE;
+ }
+ }
+#ifdef DBUS_ENABLE_VERBOSE_MODE
+ else
+ {
+ if (watch == unix_transport->read_watch)
+ _dbus_verbose ("asked to handle read watch with non-read condition 0x%x\n",
+ flags);
+ else if (watch == unix_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_fd (watch));
}
+#endif /* DBUS_ENABLE_VERBOSE_MODE */
+
+ return TRUE;
}
static void
free_watches (transport);
- close (unix_transport->fd);
+ _dbus_close (unix_transport->fd, NULL);
unix_transport->fd = -1;
}
-static void
+static dbus_bool_t
unix_connection_set (DBusTransport *transport)
{
DBusTransportUnix *unix_transport = (DBusTransportUnix*) transport;
- DBusWatch *watch;
- _dbus_assert (unix_transport->watch == NULL);
-
- watch = _dbus_watch_new (unix_transport->fd,
- DBUS_WATCH_READABLE);
-
- if (watch == NULL)
- {
- _dbus_transport_disconnect (transport);
- return;
- }
+ _dbus_watch_set_handler (unix_transport->write_watch,
+ _dbus_connection_handle_watch,
+ transport->connection, NULL);
+
+ _dbus_watch_set_handler (unix_transport->read_watch,
+ _dbus_connection_handle_watch,
+ transport->connection, NULL);
if (!_dbus_connection_add_watch (transport->connection,
- watch))
+ unix_transport->write_watch))
+ return FALSE;
+
+ if (!_dbus_connection_add_watch (transport->connection,
+ unix_transport->read_watch))
{
- _dbus_transport_disconnect (transport);
- _dbus_watch_unref (watch);
- return;
+ _dbus_connection_remove_watch (transport->connection,
+ unix_transport->write_watch);
+ return FALSE;
}
- unix_transport->watch = watch;
-
+ check_read_watch (transport);
check_write_watch (transport);
+
+ return TRUE;
}
static void
check_write_watch (transport);
}
-/* FIXME use _dbus_poll(), not select() */
+/**
+ * @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
unix_do_iteration (DBusTransport *transport,
unsigned int flags,
int timeout_milliseconds)
{
DBusTransportUnix *unix_transport = (DBusTransportUnix*) transport;
- fd_set read_set;
- fd_set write_set;
- dbus_bool_t do_select;
-
- /* "again" has to be up here because on EINTR the fd sets become
- * undefined
- */
- again:
+ DBusPollFD poll_fd;
+ int poll_res;
+ int poll_timeout;
+
+ _dbus_verbose (" iteration flags = %s%s timeout = %d read_watch = %p write_watch = %p\n",
+ flags & DBUS_ITERATION_DO_READING ? "read" : "",
+ flags & DBUS_ITERATION_DO_WRITING ? "write" : "",
+ timeout_milliseconds,
+ unix_transport->read_watch,
+ unix_transport->write_watch);
- do_select = FALSE;
-
/* 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.
+ *
+ * Also, if read_watch == NULL or write_watch == NULL, we don't
+ * want to read/write so don't.
*/
- FD_ZERO (&read_set);
- FD_ZERO (&write_set);
+ poll_fd.fd = unix_transport->fd;
+ poll_fd.events = 0;
if (_dbus_transport_get_is_authenticated (transport))
{
- if (flags & DBUS_ITERATION_DO_READING)
- {
- FD_SET (unix_transport->fd, &read_set);
- do_select = TRUE;
- }
+ if (unix_transport->read_watch &&
+ (flags & DBUS_ITERATION_DO_READING))
+ poll_fd.events |= _DBUS_POLLIN;
-
- if (flags & DBUS_ITERATION_DO_WRITING)
- {
- FD_SET (unix_transport->fd, &write_set);
- do_select = TRUE;
- }
+ if (unix_transport->write_watch &&
+ (flags & DBUS_ITERATION_DO_WRITING))
+ poll_fd.events |= _DBUS_POLLOUT;
}
else
{
auth_state = _dbus_auth_do_work (transport->auth);
- if (auth_state == DBUS_AUTH_STATE_WAITING_FOR_INPUT)
- {
- FD_SET (unix_transport->fd, &read_set);
- do_select = TRUE;
- }
+ if (transport->receive_credentials_pending ||
+ auth_state == DBUS_AUTH_STATE_WAITING_FOR_INPUT)
+ poll_fd.events |= _DBUS_POLLIN;
- if (auth_state == DBUS_AUTH_STATE_HAVE_BYTES_TO_SEND)
- {
- FD_SET (unix_transport->fd, &write_set);
- do_select = TRUE;
- }
+ if (transport->send_credentials_pending ||
+ auth_state == DBUS_AUTH_STATE_HAVE_BYTES_TO_SEND)
+ poll_fd.events |= _DBUS_POLLOUT;
}
- if (do_select)
+ if (poll_fd.events)
{
- fd_set err_set;
- struct timeval timeout;
- dbus_bool_t use_timeout;
-
- FD_ZERO (&err_set);
- FD_SET (unix_transport->fd, &err_set);
-
if (flags & DBUS_ITERATION_BLOCK)
- {
- if (timeout_milliseconds >= 0)
- {
- timeout.tv_sec = timeout_milliseconds / 1000;
- timeout.tv_usec = (timeout_milliseconds % 1000) * 1000;
-
- /* Always use timeout if one is passed in. */
- use_timeout = TRUE;
- }
- else
- {
- use_timeout = FALSE; /* NULL timeout to block forever */
- }
- }
+ poll_timeout = timeout_milliseconds;
else
- {
- /* 0 timeout to not block */
- timeout.tv_sec = 0;
- timeout.tv_usec = 0;
- use_timeout = TRUE;
- }
+ 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_connection_unlock (transport->connection);
- if (select (unix_transport->fd + 1, &read_set, &write_set, &err_set,
- use_timeout ? &timeout : NULL) >= 0)
+ again:
+ poll_res = _dbus_poll (&poll_fd, 1, poll_timeout);
+
+ if (poll_res < 0 && errno == EINTR)
+ goto again;
+
+ if (flags & DBUS_ITERATION_BLOCK)
+ _dbus_connection_lock (transport->connection);
+
+ if (poll_res >= 0)
{
- if (FD_ISSET (unix_transport->fd, &err_set))
+ if (poll_fd.revents & _DBUS_POLLERR)
do_io_error (transport);
else
{
- dbus_bool_t need_read = FD_ISSET (unix_transport->fd, &read_set);
- dbus_bool_t need_write = FD_ISSET (unix_transport->fd, &write_set);
+ dbus_bool_t need_read = (poll_fd.revents & _DBUS_POLLIN) > 0;
+ dbus_bool_t need_write = (poll_fd.revents & _DBUS_POLLOUT) > 0;
_dbus_verbose ("in iteration, need_read=%d need_write=%d\n",
need_read, need_write);
do_writing (transport);
}
}
- else if (errno == EINTR)
- goto again;
else
{
- _dbus_verbose ("Error from select(): %s\n",
+ _dbus_verbose ("Error from _dbus_poll(): %s\n",
_dbus_strerror (errno));
}
}
}
+static void
+unix_live_messages_changed (DBusTransport *transport)
+{
+ /* See if we should look for incoming messages again */
+ check_read_watch (transport);
+}
+
+
+static dbus_bool_t
+unix_get_unix_fd (DBusTransport *transport,
+ int *fd_p)
+{
+ DBusTransportUnix *unix_transport = (DBusTransportUnix*) transport;
+
+ *fd_p = unix_transport->fd;
+
+ return TRUE;
+}
+
static DBusTransportVTable unix_vtable = {
unix_finalize,
unix_handle_watch,
unix_disconnect,
unix_connection_set,
unix_messages_pending,
- unix_do_iteration
+ unix_do_iteration,
+ unix_live_messages_changed,
+ unix_get_unix_fd
};
/**
*
* @param fd the file descriptor.
* @param server #TRUE 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_fd (int fd,
- dbus_bool_t server)
+_dbus_transport_new_for_fd (int fd,
+ dbus_bool_t server,
+ const DBusString *address)
{
DBusTransportUnix *unix_transport;
if (unix_transport == NULL)
return NULL;
- if (!_dbus_string_init (&unix_transport->encoded_message,
- _DBUS_INT_MAX))
- {
- dbus_free (unix_transport);
- return NULL;
- }
+ if (!_dbus_string_init (&unix_transport->encoded_outgoing))
+ goto failed_0;
+
+ if (!_dbus_string_init (&unix_transport->encoded_incoming))
+ goto failed_1;
+
+ unix_transport->write_watch = _dbus_watch_new (fd,
+ DBUS_WATCH_WRITABLE,
+ FALSE,
+ NULL, NULL, NULL);
+ if (unix_transport->write_watch == NULL)
+ goto failed_2;
+
+ unix_transport->read_watch = _dbus_watch_new (fd,
+ DBUS_WATCH_READABLE,
+ FALSE,
+ NULL, NULL, NULL);
+ if (unix_transport->read_watch == NULL)
+ goto failed_3;
if (!_dbus_transport_init_base (&unix_transport->base,
&unix_vtable,
- server))
- {
- _dbus_string_free (&unix_transport->encoded_message);
- dbus_free (unix_transport);
- return NULL;
- }
+ server, address))
+ goto failed_4;
unix_transport->fd = fd;
unix_transport->message_bytes_written = 0;
/* These values should probably be tunable or something. */
unix_transport->max_bytes_read_per_iteration = 2048;
unix_transport->max_bytes_written_per_iteration = 2048;
-
- check_write_watch ((DBusTransport*) unix_transport);
return (DBusTransport*) unix_transport;
+
+ failed_4:
+ _dbus_watch_unref (unix_transport->read_watch);
+ failed_3:
+ _dbus_watch_unref (unix_transport->write_watch);
+ failed_2:
+ _dbus_string_free (&unix_transport->encoded_incoming);
+ failed_1:
+ _dbus_string_free (&unix_transport->encoded_outgoing);
+ failed_0:
+ dbus_free (unix_transport);
+ return NULL;
}
/**
* Creates a new transport for the given Unix domain socket
- * path.
+ * path. This creates a client-side of a transport.
+ *
+ * @todo once we add a way to escape paths in a dbus
+ * address, this function needs to do escaping.
*
* @param path the path to the domain socket.
- * @param server #TRUE if this transport is on the server side of a connection
- * @param result location to store reason for failure.
+ * @param abstract #TRUE to use abstract socket namespace
+ * @param error address where an error can be returned.
* @returns a new transport, or #NULL on failure.
*/
DBusTransport*
_dbus_transport_new_for_domain_socket (const char *path,
- dbus_bool_t server,
- DBusResultCode *result)
+ dbus_bool_t abstract,
+ 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;
+ }
+
+ fd = -1;
- fd = _dbus_connect_unix_socket (path, result);
+ if ((abstract &&
+ !_dbus_string_append (&address, "unix:abstract=")) ||
+ (!abstract &&
+ !_dbus_string_append (&address, "unix:path=")) ||
+ !_dbus_string_append (&address, path))
+ {
+ dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
+ goto failed_0;
+ }
+
+ fd = _dbus_connect_unix_socket (path, abstract, error);
if (fd < 0)
- return NULL;
+ {
+ _DBUS_ASSERT_ERROR_IS_SET (error);
+ goto failed_0;
+ }
+ _dbus_fd_set_close_on_exec (fd);
+
_dbus_verbose ("Successfully connected to unix socket %s\n",
path);
+
+ transport = _dbus_transport_new_for_fd (fd, FALSE, &address);
+ if (transport == NULL)
+ {
+ dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
+ goto failed_1;
+ }
- transport = _dbus_transport_new_for_fd (fd, server);
+ _dbus_string_free (&address);
+
+ return transport;
+
+ failed_1:
+ _dbus_close (fd, NULL);
+ failed_0:
+ _dbus_string_free (&address);
+ return NULL;
+}
+
+/**
+ * Creates a new transport for the given hostname and port.
+ *
+ * @param host the host to connect to
+ * @param port the port 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,
+ dbus_int32_t port,
+ 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 (!_dbus_string_append (&address, "tcp:host=") ||
+ !_dbus_string_append (&address, host) ||
+ !_dbus_string_append (&address, ",port=") ||
+ !_dbus_string_append_int (&address, port))
+ {
+ _dbus_string_free (&address);
+ dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
+ return NULL;
+ }
+
+ fd = _dbus_connect_tcp_socket (host, port, 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:%d\n",
+ host, port);
+
+ transport = _dbus_transport_new_for_fd (fd, FALSE, &address);
if (transport == NULL)
{
- dbus_set_result (result, DBUS_RESULT_NO_MEMORY);
- close (fd);
+ dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
+ _dbus_close (fd, NULL);
+ _dbus_string_free (&address);
fd = -1;
}
+
+ _dbus_string_free (&address);
return transport;
}
-
/** @} */
projects / platform / upstream / dbus.git / blobdiff