-/* -*- mode: C; c-file-style: "gnu" -*- */
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/* dbus-bus.c Convenience functions for communicating with the bus.
*
* Copyright (C) 2003 CodeFactory AB
* Copyright (C) 2003 Red Hat, Inc.
+ * Copyright (C) 2013 Samsung Electronics
*
* Licensed under the Academic Free License version 2.1
*
*
* 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
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
+#include <config.h>
#include "dbus-bus.h"
#include "dbus-protocol.h"
#include "dbus-internals.h"
#include "dbus-message.h"
#include "dbus-marshal-validate.h"
+#include "dbus-misc.h"
#include "dbus-threads-internal.h"
#include "dbus-connection-internal.h"
-#include <string.h>
+#include "dbus-string.h"
+#ifdef ENABLE_KDBUS_TRANSPORT
+#include "dbus-transport-kdbus.h"
+#include <stdlib.h>
+#include <limits.h>
+#include <stdio.h>
+#endif
/**
* @defgroup DBusBus Message bus APIs
static dbus_bool_t initialized = FALSE;
-/**
- * Lock for globals in this file
- */
-_DBUS_DEFINE_GLOBAL_LOCK (bus);
-
-/**
- * Global lock covering all BusData on any connection. The bet is
- * that some lock contention is better than more memory
- * for a per-connection lock, but it's tough to imagine it mattering
- * either way.
- */
-_DBUS_DEFINE_GLOBAL_LOCK (bus_datas);
-
static void
addresses_shutdown_func (void *data)
{
}
activation_bus_type = DBUS_BUS_STARTER;
+
+ initialized = FALSE;
}
static dbus_bool_t
}
}
+#ifdef ENABLE_KDBUS_TRANSPORT
+void dbus_bus_set_bus_connection_address(DBusBusType address_type, char* address)
+{
+ if(bus_connection_addresses[address_type] != NULL)
+ free(bus_connection_addresses[address_type]);
+ bus_connection_addresses[address_type] = address;
+}
+#endif
+
+static dbus_bool_t
+init_session_address (void)
+{
+ dbus_bool_t retval;
+
+ retval = FALSE;
+
+ /* First, look in the environment. This is the normal case on
+ * freedesktop.org/Unix systems. */
+ get_from_env (&bus_connection_addresses[DBUS_BUS_SESSION],
+ "DBUS_SESSION_BUS_ADDRESS");
+ if (bus_connection_addresses[DBUS_BUS_SESSION] == NULL)
+ {
+ dbus_bool_t supported;
+ DBusString addr;
+ DBusError error = DBUS_ERROR_INIT;
+
+ if (!_dbus_string_init (&addr))
+ return FALSE;
+
+ supported = FALSE;
+ /* So it's not in the environment - let's try a platform-specific method.
+ * On MacOS, this involves asking launchd. On Windows (not specified yet)
+ * we might do a COM lookup.
+ * Ignore errors - if we failed, fall back to autolaunch. */
+ retval = _dbus_lookup_session_address (&supported, &addr, &error);
+ if (supported && retval)
+ {
+ retval =_dbus_string_steal_data (&addr, &bus_connection_addresses[DBUS_BUS_SESSION]);
+ }
+ else if (supported && !retval)
+ {
+ if (dbus_error_is_set(&error))
+ _dbus_warn ("Dynamic session lookup supported but failed: %s\n", error.message);
+ else
+ _dbus_warn ("Dynamic session lookup supported but failed silently\n");
+ }
+ _dbus_string_free (&addr);
+ }
+ else
+ retval = TRUE;
+
+ if (!retval)
+ return FALSE;
+
+ /* We have a hard-coded (but compile-time-configurable) fallback address for
+ * the session bus. */
+ if (bus_connection_addresses[DBUS_BUS_SESSION] == NULL)
+ bus_connection_addresses[DBUS_BUS_SESSION] =
+ _dbus_strdup (DBUS_SESSION_BUS_CONNECT_ADDRESS);
+
+ if (bus_connection_addresses[DBUS_BUS_SESSION] == NULL)
+ return FALSE;
+
+ return TRUE;
+}
+
static dbus_bool_t
init_connections_unlocked (void)
{
{
_dbus_verbose ("Filling in session bus address...\n");
- if (!get_from_env (&bus_connection_addresses[DBUS_BUS_SESSION],
- "DBUS_SESSION_BUS_ADDRESS"))
+ if (!init_session_address ())
return FALSE;
- if (bus_connection_addresses[DBUS_BUS_SESSION] == NULL)
- bus_connection_addresses[DBUS_BUS_SESSION] =
- _dbus_strdup (DBUS_SESSION_BUS_DEFAULT_ADDRESS);
-
- if (bus_connection_addresses[DBUS_BUS_SESSION] == NULL)
- return FALSE;
-
_dbus_verbose (" \"%s\"\n", bus_connection_addresses[DBUS_BUS_SESSION] ?
bus_connection_addresses[DBUS_BUS_SESSION] : "none set");
}
* the above code will work right
*/
- if (!_dbus_setenv ("DBUS_ACTIVATION_ADDRESS", NULL))
+ if (!dbus_setenv ("DBUS_ACTIVATION_ADDRESS", NULL))
return FALSE;
- if (!_dbus_setenv ("DBUS_ACTIVATION_BUS_TYPE", NULL))
+ if (!dbus_setenv ("DBUS_ACTIVATION_BUS_TYPE", NULL))
return FALSE;
if (!_dbus_register_shutdown_func (addresses_shutdown_func,
if (bd->is_well_known)
{
int i;
- _DBUS_LOCK (bus);
+
+ if (!_DBUS_LOCK (bus))
+ _dbus_assert_not_reached ("global locks should have been initialized "
+ "when we attached bus data");
+
/* We may be stored in more than one slot */
/* This should now be impossible - these slots are supposed to
* be cleared on disconnect, so should not need to be cleared on
_dbus_bus_notify_shared_connection_disconnected_unlocked (DBusConnection *connection)
{
int i;
-
- _DBUS_LOCK (bus);
+
+ if (!_DBUS_LOCK (bus))
+ {
+ /* If it was in bus_connections, we would have initialized global locks
+ * when we added it. So, it can't be. */
+ return;
+ }
/* We are expecting to have the connection saved in only one of these
* slots, but someone could in a pathological case set system and session
_dbus_return_val_if_fail (type >= 0 && type < N_BUS_TYPES, NULL);
_dbus_return_val_if_error_is_set (error, NULL);
- _DBUS_LOCK (bus);
+ connection = NULL;
- if (!init_connections_unlocked ())
+ if (!_DBUS_LOCK (bus))
{
- _DBUS_UNLOCK (bus);
_DBUS_SET_OOM (error);
+ /* do not "goto out", that would try to unlock */
return NULL;
}
+ if (!init_connections_unlocked ())
+ {
+ _DBUS_SET_OOM (error);
+ goto out;
+ }
+
/* We want to use the activation address even if the
* activating bus is the session or system bus,
* per the spec.
{
connection = bus_connections[type];
dbus_connection_ref (connection);
-
- _DBUS_UNLOCK (bus);
- return connection;
+ goto out;
}
address = bus_connection_addresses[address_type];
{
dbus_set_error (error, DBUS_ERROR_FAILED,
"Unable to determine the address of the message bus (try 'man dbus-launch' and 'man dbus-daemon' for help)");
- _DBUS_UNLOCK (bus);
- return NULL;
+ goto out;
}
if (private)
if (!connection)
{
- _DBUS_ASSERT_ERROR_IS_SET (error);
- _DBUS_UNLOCK (bus);
- return NULL;
+ goto out;
}
- /* By default we're bound to the lifecycle of
- * the message bus.
- */
- dbus_connection_set_exit_on_disconnect (connection,
- TRUE);
-
if (!dbus_bus_register (connection, error))
{
- _DBUS_ASSERT_ERROR_IS_SET (error);
_dbus_connection_close_possibly_shared (connection);
dbus_connection_unref (connection);
-
- _DBUS_UNLOCK (bus);
- return NULL;
+ connection = NULL;
+ goto out;
}
if (!private)
bus_connections[type] = connection;
}
- _DBUS_LOCK (bus_datas);
+ /* By default we're bound to the lifecycle of
+ * the message bus.
+ */
+ dbus_connection_set_exit_on_disconnect (connection,
+ TRUE);
+
+ if (!_DBUS_LOCK (bus_datas))
+ _dbus_assert_not_reached ("global locks were initialized already");
+
bd = ensure_bus_data (connection);
_dbus_assert (bd != NULL); /* it should have been created on
register, so OOM not possible */
bd->is_well_known = TRUE;
_DBUS_UNLOCK (bus_datas);
-
- _DBUS_UNLOCK (bus);
+out:
+ /* Return a reference to the caller, or NULL with error set. */
+ if (connection == NULL)
+ _DBUS_ASSERT_ERROR_IS_SET (error);
- /* Return a reference to the caller */
+ _DBUS_UNLOCK (bus);
return connection;
}
*
* @param type bus type
* @param error address where an error can be returned.
- * @returns a #DBusConnection with new ref
+ * @returns a #DBusConnection with new ref or #NULL on error
*/
DBusConnection *
dbus_bus_get (DBusBusType type,
DBusError *error)
{
DBusMessage *message, *reply;
- char *name;
+ char *name = NULL;
BusData *bd;
dbus_bool_t retval;
_dbus_return_val_if_error_is_set (error, FALSE);
retval = FALSE;
+ message = NULL;
+ reply = NULL;
- _DBUS_LOCK (bus_datas);
+ if (!_DBUS_LOCK (bus_datas))
+ {
+ _DBUS_SET_OOM (error);
+ /* do not "goto out", that would try to unlock */
+ return FALSE;
+ }
bd = ensure_bus_data (connection);
if (bd == NULL)
{
_DBUS_SET_OOM (error);
- _DBUS_UNLOCK (bus_datas);
- return FALSE;
+ goto out;
}
if (bd->unique_name != NULL)
{
_dbus_verbose ("Ignoring attempt to register the same DBusConnection %s with the message bus a second time.\n",
bd->unique_name);
- _DBUS_UNLOCK (bus_datas);
-
/* Success! */
- return TRUE;
+ retval = TRUE;
+ goto out;
}
-
message = dbus_message_new_method_call (DBUS_SERVICE_DBUS,
- DBUS_PATH_DBUS,
- DBUS_INTERFACE_DBUS,
- "Hello");
-
+ DBUS_PATH_DBUS,
+ DBUS_INTERFACE_DBUS,
+ "Hello");
if (!message)
- {
- _DBUS_SET_OOM (error);
+ {
+ _DBUS_SET_OOM (error);
+ goto out;
+ }
- _DBUS_UNLOCK (bus_datas);
- return FALSE;
- }
-
reply = dbus_connection_send_with_reply_and_block (connection, message, -1, error);
- dbus_message_unref (message);
-
if (reply == NULL)
- goto out;
+ goto out;
else if (dbus_set_error_from_message (error, reply))
- goto out;
+ goto out;
else if (!dbus_message_get_args (reply, error,
- DBUS_TYPE_STRING, &name,
- DBUS_TYPE_INVALID))
- goto out;
-
+ DBUS_TYPE_STRING, &name,
+ DBUS_TYPE_INVALID))
+ goto out;
+
bd->unique_name = _dbus_strdup (name);
+
if (bd->unique_name == NULL)
{
_DBUS_SET_OOM (error);
goto out;
}
-
+
retval = TRUE;
out:
+ _DBUS_UNLOCK (bus_datas);
+
+ if (message)
+ dbus_message_unref (message);
+
if (reply)
dbus_message_unref (reply);
if (!retval)
_DBUS_ASSERT_ERROR_IS_SET (error);
- _DBUS_UNLOCK (bus_datas);
-
return retval;
}
const char *unique_name)
{
BusData *bd;
- dbus_bool_t success;
+ dbus_bool_t success = FALSE;
_dbus_return_val_if_fail (connection != NULL, FALSE);
_dbus_return_val_if_fail (unique_name != NULL, FALSE);
- _DBUS_LOCK (bus_datas);
-
+ if (!_DBUS_LOCK (bus_datas))
+ {
+ /* do not "goto out", that would try to unlock */
+ return FALSE;
+ }
+
bd = ensure_bus_data (connection);
if (bd == NULL)
- return FALSE;
+ goto out;
_dbus_assert (bd->unique_name == NULL);
bd->unique_name = _dbus_strdup (unique_name);
success = bd->unique_name != NULL;
-
+
+out:
_DBUS_UNLOCK (bus_datas);
return success;
dbus_bus_get_unique_name (DBusConnection *connection)
{
BusData *bd;
- const char *unique_name;
+ const char *unique_name = NULL;
_dbus_return_val_if_fail (connection != NULL, NULL);
- _DBUS_LOCK (bus_datas);
-
+ if (!_DBUS_LOCK (bus_datas))
+ {
+ /* We'd have initialized locks when we gave it its unique name, if it
+ * had one. Don't "goto out", that would try to unlock. */
+ return NULL;
+ }
+
bd = ensure_bus_data (connection);
if (bd == NULL)
- return NULL;
+ goto out;
unique_name = bd->unique_name;
+out:
_DBUS_UNLOCK (bus_datas);
-
+
return unique_name;
}
return (unsigned long) uid;
}
+/**
+ * Asks the bus to return its globally unique ID, as described in the
+ * D-Bus specification. For the session bus, this is useful as a way
+ * to uniquely identify each user session. For the system bus,
+ * probably the bus ID is not useful; instead, use the machine ID
+ * since it's accessible without necessarily connecting to the bus and
+ * may be persistent beyond a single bus instance (across reboots for
+ * example). See dbus_get_local_machine_id().
+ *
+ * In addition to an ID for each bus and an ID for each machine, there is
+ * an ID for each address that the bus is listening on; that can
+ * be retrieved with dbus_connection_get_server_id(), though it is
+ * probably not very useful.
+ *
+ * @param connection the connection
+ * @param error location to store the error
+ * @returns the bus ID or #NULL if error is set
+ */
+char*
+dbus_bus_get_id (DBusConnection *connection,
+ DBusError *error)
+{
+ DBusMessage *message, *reply;
+ char *id;
+ const char *v_STRING;
+
+ _dbus_return_val_if_fail (connection != NULL, NULL);
+ _dbus_return_val_if_error_is_set (error, NULL);
+
+ message = dbus_message_new_method_call (DBUS_SERVICE_DBUS,
+ DBUS_PATH_DBUS,
+ DBUS_INTERFACE_DBUS,
+ "GetId");
+
+ if (message == NULL)
+ {
+ _DBUS_SET_OOM (error);
+ return NULL;
+ }
+
+ reply = dbus_connection_send_with_reply_and_block (connection, message, -1,
+ error);
+
+ dbus_message_unref (message);
+
+ if (reply == NULL)
+ {
+ _DBUS_ASSERT_ERROR_IS_SET (error);
+ return NULL;
+ }
+
+ if (dbus_set_error_from_message (error, reply))
+ {
+ _DBUS_ASSERT_ERROR_IS_SET (error);
+ dbus_message_unref (reply);
+ return NULL;
+ }
+
+ v_STRING = NULL;
+ if (!dbus_message_get_args (reply, error,
+ DBUS_TYPE_STRING, &v_STRING,
+ DBUS_TYPE_INVALID))
+ {
+ _DBUS_ASSERT_ERROR_IS_SET (error);
+ dbus_message_unref (reply);
+ return NULL;
+ }
+
+ id = _dbus_strdup (v_STRING); /* may be NULL */
+
+ dbus_message_unref (reply);
+
+ if (id == NULL)
+ _DBUS_SET_OOM (error);
+
+ /* FIXME it might be nice to cache the ID locally */
+
+ return id;
+}
/**
* Asks the bus to assign the given name to this connection by invoking
unsigned int flags,
DBusError *error)
{
- DBusMessage *message, *reply;
- dbus_uint32_t result;
-
- _dbus_return_val_if_fail (connection != NULL, 0);
- _dbus_return_val_if_fail (name != NULL, 0);
- _dbus_return_val_if_fail (_dbus_check_is_valid_bus_name (name), 0);
- _dbus_return_val_if_error_is_set (error, 0);
-
- message = dbus_message_new_method_call (DBUS_SERVICE_DBUS,
- DBUS_PATH_DBUS,
- DBUS_INTERFACE_DBUS,
- "RequestName");
-
- if (message == NULL)
- {
- _DBUS_SET_OOM (error);
- return -1;
- }
-
- if (!dbus_message_append_args (message,
- DBUS_TYPE_STRING, &name,
- DBUS_TYPE_UINT32, &flags,
- DBUS_TYPE_INVALID))
- {
- dbus_message_unref (message);
- _DBUS_SET_OOM (error);
- return -1;
- }
-
- reply = dbus_connection_send_with_reply_and_block (connection, message, -1,
- error);
-
- dbus_message_unref (message);
-
- if (reply == NULL)
- {
- _DBUS_ASSERT_ERROR_IS_SET (error);
- return -1;
- }
-
- if (dbus_set_error_from_message (error, reply))
- {
- _DBUS_ASSERT_ERROR_IS_SET (error);
- dbus_message_unref (reply);
- return -1;
- }
-
- if (!dbus_message_get_args (reply, error,
- DBUS_TYPE_UINT32, &result,
- DBUS_TYPE_INVALID))
- {
- _DBUS_ASSERT_ERROR_IS_SET (error);
- dbus_message_unref (reply);
- return -1;
- }
-
- dbus_message_unref (reply);
-
- return result;
+ dbus_uint32_t result;
+ DBusMessage *message, *reply;
+
+ _dbus_return_val_if_fail (connection != NULL, 0);
+ _dbus_return_val_if_fail (name != NULL, 0);
+ _dbus_return_val_if_fail (_dbus_check_is_valid_bus_name (name), 0);
+ _dbus_return_val_if_error_is_set (error, 0);
+
+ message = dbus_message_new_method_call (DBUS_SERVICE_DBUS,
+ DBUS_PATH_DBUS,
+ DBUS_INTERFACE_DBUS,
+ "RequestName");
+ if (message == NULL)
+ {
+ _DBUS_SET_OOM (error);
+ return -1;
+ }
+
+ if (!dbus_message_append_args (message,
+ DBUS_TYPE_STRING, &name,
+ DBUS_TYPE_UINT32, &flags,
+ DBUS_TYPE_INVALID))
+ {
+ dbus_message_unref (message);
+ _DBUS_SET_OOM (error);
+ return -1;
+ }
+
+ reply = dbus_connection_send_with_reply_and_block (connection, message, -1,
+ error);
+
+ dbus_message_unref (message);
+
+ if (reply == NULL)
+ {
+ _DBUS_ASSERT_ERROR_IS_SET (error);
+ return -1;
+ }
+
+ if (dbus_set_error_from_message (error, reply))
+ {
+ _DBUS_ASSERT_ERROR_IS_SET (error);
+ dbus_message_unref (reply);
+ return -1;
+ }
+
+ if (!dbus_message_get_args (reply, error,
+ DBUS_TYPE_UINT32, &result,
+ DBUS_TYPE_INVALID))
+ {
+ _DBUS_ASSERT_ERROR_IS_SET (error);
+ dbus_message_unref (reply);
+ return -1;
+ }
+
+ dbus_message_unref (reply);
+ return result;
}
* If you pass #NULL for the error, this function will not
* block; the match thus won't be added until you flush the
* connection, and if there's an error adding the match
- * (only possible error is lack of resources in the bus),
- * you won't find out about it.
+ * you won't find out about it. This is generally acceptable, since the
+ * possible errors (including a lack of resources in the bus, the connection
+ * having exceeded its quota of active match rules, or the match rule being
+ * unparseable) are generally unrecoverable.
*
* If you pass non-#NULL for the error this function will
- * block until it gets a reply.
+ * block until it gets a reply. This may be useful when using match rule keys
+ * introduced in recent versions of D-Bus, like 'arg0namespace', to allow the
+ * application to fall back to less efficient match rules supported by older
+ * versions of the daemon if the running version is not new enough; or when
+ * using user-supplied rules rather than rules hard-coded at compile time.
*
* Normal API conventions would have the function return
* a boolean value indicating whether the error was set,
*
* Currently there is no way to match against non-string arguments.
*
+ * A specialised form of wildcard matching on arguments is
+ * supported for path-like namespaces. If your argument match has
+ * a 'path' suffix (eg: "arg0path='/some/path/'") then it is
+ * considered a match if the argument exactly matches the given
+ * string or if one of them ends in a '/' and is a prefix of the
+ * other.
+ *
* Matching on interface is tricky because method call
* messages only optionally specify the interface.
* If a message omits the interface, then it will NOT match
const char *rule,
DBusError *error)
{
- DBusMessage *msg;
+ DBusMessage *msg;
- _dbus_return_if_fail (rule != NULL);
+ _dbus_return_if_fail (rule != NULL);
- msg = dbus_message_new_method_call (DBUS_SERVICE_DBUS,
+ msg = dbus_message_new_method_call (DBUS_SERVICE_DBUS,
DBUS_PATH_DBUS,
DBUS_INTERFACE_DBUS,
"AddMatch");
- if (msg == NULL)
- {
- _DBUS_SET_OOM (error);
- return;
- }
+ if (msg == NULL)
+ {
+ _DBUS_SET_OOM (error);
+ return;
+ }
- if (!dbus_message_append_args (msg, DBUS_TYPE_STRING, &rule,
- DBUS_TYPE_INVALID))
- {
- dbus_message_unref (msg);
- _DBUS_SET_OOM (error);
- return;
- }
+ if (!dbus_message_append_args (msg, DBUS_TYPE_STRING, &rule,
+ DBUS_TYPE_INVALID))
+ {
+ dbus_message_unref (msg);
+ _DBUS_SET_OOM (error);
+ return;
+ }
- send_no_return_values (connection, msg, error);
+ send_no_return_values (connection, msg, error);
- dbus_message_unref (msg);
+ dbus_message_unref (msg);
}
/**
const char *rule,
DBusError *error)
{
- DBusMessage *msg;
+ DBusMessage *msg;
- _dbus_return_if_fail (rule != NULL);
-
- msg = dbus_message_new_method_call (DBUS_SERVICE_DBUS,
- DBUS_PATH_DBUS,
- DBUS_INTERFACE_DBUS,
- "RemoveMatch");
+ _dbus_return_if_fail (rule != NULL);
- if (!dbus_message_append_args (msg, DBUS_TYPE_STRING, &rule,
- DBUS_TYPE_INVALID))
- {
- dbus_message_unref (msg);
- _DBUS_SET_OOM (error);
- return;
- }
+ msg = dbus_message_new_method_call (DBUS_SERVICE_DBUS,
+ DBUS_PATH_DBUS,
+ DBUS_INTERFACE_DBUS,
+ "RemoveMatch");
- send_no_return_values (connection, msg, error);
+ if (!dbus_message_append_args (msg, DBUS_TYPE_STRING, &rule,
+ DBUS_TYPE_INVALID))
+ {
+ dbus_message_unref (msg);
+ _DBUS_SET_OOM (error);
+ return;
+ }
- dbus_message_unref (msg);
+ send_no_return_values (connection, msg, error);
+
+ dbus_message_unref (msg);
}
/** @} */
projects / platform / upstream / dbus.git / blobdiff