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glib/gio/gdbusconnection.c
David Zeuthen 763c1dab1f GDBus: Use specific variant type in GetAll() 
Without this fix, we segfault if the exported object returned an error
on all get_property() calls (in reality, this never happens).

Signed-off-by: David Zeuthen <davidz@redhat.com>
2010-05-14 21:08:01 -04:00

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/* GDBus - GLib D-Bus Library
*
* Copyright (C) 2008-2010 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* Author: David Zeuthen <davidz@redhat.com>
*/
/*
* TODO for GDBus:
*
* - Validate all data (e.g. UTF-8) and check all the required D-Bus headers
* are present and forbidden ones aren't
* - When writing: g_dbus_message_to_blob()
* - When reading: g_dbus_message_new_from_blob()
*
* - would be nice to expose GDBusAuthMechanism and an extension point
*
* - Need to rewrite GDBusAuth and rework GDBusAuthMechanism. In particular
* the mechanism VFuncs need to be able to set an error.
*
* - Need to document other mechanisms/sources for determining the D-Bus
* address of a well-known bus.
*
* - e.g. on Win32 we need code like from here
*
* http://cgit.freedesktop.org/~david/gdbus-standalone/tree/gdbus/gdbusaddress.c#n900
*
* that was never copied over here because it originally was copy-paste
* from the GPLv2 / AFL 2.1 libdbus sources.
*
* - on OS X we need to look in launchd for the address
*
* https://bugs.freedesktop.org/show_bug.cgi?id=14259
*
* - on X11 we need to look in a X11 property on the X server
* - (we can also just use dbus-launch(1) from the D-Bus
* distribution)
*
* - (ideally) this requires D-Bus spec work because none of
* this has never really been specced out properly (excect
* the X11 bits)
*
* - Related to the above, we also need to be able to launch a message bus
* instance.... Since we don't want to write our own bus daemon we should
* launch dbus-daemon(1) (thus: Win32 and OS X need to bundle it)
*
* - probably want a G_DBUS_NONCE_TCP_TMPDIR environment variable
* to specify where the nonce is stored. This will allow people to use
* G_DBUS_NONCE_TCP_TMPDIR=/mnt/secure.company.server/dbus-nonce-dir
* to easily acheive secure RPC via nonce-tcp.
*
* - need to expose an extension point for resolving D-Bus address and
* turning them into GIOStream objects. This will allow us to implement
* e.g. X11 D-Bus transports without dlopen()'ing or linking against
* libX11 from libgio.
* - see g_dbus_address_connect() in gdbusaddress.c
*
* - would be cute to use kernel-specific APIs to resolve fds for
* debug output when using G_DBUS_DEBUG=messages, e.g. in addition to
*
* fd 21: dev=8:1,mode=0100644,ino=1171231,uid=0,gid=0,rdev=0:0,size=234,atime=1273070640,mtime=1267126160,ctime=1267126160
*
* maybe we can show more information about what fd 21 really is.
* Ryan suggests looking in /proc/self/fd for clues / symlinks!
* Initial experiments on Linux 2.6 suggests that the symlink looks
* like this:
*
* 3 -> /proc/18068/fd
*
* e.g. not of much use.
*
* - GDBus High-Level docs
* - Proxy: properties, signals...
* - Connection: IOStream based, ::close, connection setup steps
* mainloop integration, threading
* - Differences from libdbus (extend "Migrating from")
* - the message handling thread
* - Using GVariant instead of GValue
* - Explain why the high-level API is a good thing and what
* kind of pitfalls it avoids
* - Export objects before claiming names
* - Talk about auto-starting services (cf. GBusNameWatcherFlags)
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "gdbusauth.h"
#include "gdbusutils.h"
#include "gdbusaddress.h"
#include "gdbusmessage.h"
#include "gdbusconnection.h"
#include "gdbuserror.h"
#include "gioenumtypes.h"
#include "gdbusintrospection.h"
#include "gdbusmethodinvocation.h"
#include "gdbusprivate.h"
#include "gdbusauthobserver.h"
#include "gio-marshal.h"
#include "ginitable.h"
#include "gasyncinitable.h"
#include "giostream.h"
#include "gasyncresult.h"
#include "gsimpleasyncresult.h"
#ifdef G_OS_UNIX
#include "gunixconnection.h"
#include "gunixfdmessage.h"
#endif
#include "glibintl.h"
#include "gioalias.h"
/**
* SECTION:gdbusconnection
* @short_description: D-Bus Connections
* @include: gio/gio.h
*
* The #GDBusConnection type is used for D-Bus connections to remote
* peers such as a message buses. It is a low-level API that offers a
* lot of flexibility. For instance, it lets you establish a connection
* over any transport that can by represented as an #GIOStream.
*
* This class is rarely used directly in D-Bus clients. If you are writing
* an D-Bus client, it is often easier to use the g_bus_own_name(),
* g_bus_watch_name() or g_bus_watch_proxy() APIs.
*
* <example id="gdbus-server"><title>D-Bus server example</title><programlisting><xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" href="../../../../gio/tests/gdbus-example-server.c"><xi:fallback>FIXME: MISSING XINCLUDE CONTENT</xi:fallback></xi:include></programlisting></example>
*
* <example id="gdbus-subtree-server"><title>D-Bus subtree example</title><programlisting><xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" href="../../../../gio/tests/gdbus-example-subtree.c"><xi:fallback>FIXME: MISSING XINCLUDE CONTENT</xi:fallback></xi:include></programlisting></example>
*
* <example id="gdbus-unix-fd-client"><title>D-Bus UNIX File Descriptor example</title><programlisting><xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" href="../../../../gio/tests/gdbus-example-unix-fd-client.c"><xi:fallback>FIXME: MISSING XINCLUDE CONTENT</xi:fallback></xi:include></programlisting></example>
*
* <example id="gdbus-export"><title>Exporting a GObject</title><programlisting><xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" href="../../../../gio/tests/gdbus-example-export.c"><xi:fallback>FIXME: MISSING XINCLUDE CONTENT</xi:fallback></xi:include></programlisting></example>
*/
/* ---------------------------------------------------------------------------------------------------- */
G_LOCK_DEFINE_STATIC (message_bus_lock);
static GDBusConnection *the_session_bus = NULL;
static GDBusConnection *the_system_bus = NULL;
/* ---------------------------------------------------------------------------------------------------- */
static gboolean
_g_strv_has_string (const gchar* const *haystack,
const gchar *needle)
{
guint n;
for (n = 0; haystack != NULL && haystack[n] != NULL; n++)
{
if (g_strcmp0 (haystack[n], needle) == 0)
return TRUE;
}
return FALSE;
}
/* ---------------------------------------------------------------------------------------------------- */
#ifdef G_OS_WIN32
#define CONNECTION_ENSURE_LOCK(obj) do { ; } while (FALSE)
#else
// TODO: for some reason this doesn't work on Windows
#define CONNECTION_ENSURE_LOCK(obj) do { \
if (G_UNLIKELY (g_mutex_trylock((obj)->priv->lock))) \
{ \
g_assertion_message (G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, \
"CONNECTION_ENSURE_LOCK: GDBusConnection object lock is not locked"); \
} \
} while (FALSE)
#endif
#define CONNECTION_LOCK(obj) do { \
g_mutex_lock ((obj)->priv->lock); \
} while (FALSE)
#define CONNECTION_UNLOCK(obj) do { \
g_mutex_unlock ((obj)->priv->lock); \
} while (FALSE)
struct _GDBusConnectionPrivate
{
/* ------------------------------------------------------------------------ */
/* -- General object state ------------------------------------------------ */
/* ------------------------------------------------------------------------ */
/* object-wide lock */
GMutex *lock;
/* A lock used in the init() method of the GInitable interface - see comments
* in initable_init() for why a separate lock is needed
*/
GMutex *init_lock;
/* Set (by loading the contents of /var/lib/dbus/machine-id) the first time
* someone calls org.freedesktop.DBus.GetMachineId()
*/
gchar *machine_id;
/* The underlying stream used for communication */
GIOStream *stream;
/* The object used for authentication (if any) */
GDBusAuth *auth;
/* Set to TRUE if the connection has been closed */
gboolean closed;
/* Last serial used */
guint32 last_serial;
/* The object used to send/receive message */
GDBusWorker *worker;
/* If connected to a message bus, this contains the unique name assigned to
* us by the bus (e.g. ":1.42")
*/
gchar *bus_unique_name;
/* The GUID returned by the other side if we authenticed as a client or
* the GUID to use if authenticating as a server
*/
gchar *guid;
/* set to TRUE exactly when initable_init() has finished running */
gboolean is_initialized;
/* If the connection could not be established during initable_init(), this GError will set */
GError *initialization_error;
/* The result of g_main_context_get_thread_default() when the object
* was created (the GObject _init() function) - this is used for delivery
* of the :closed GObject signal.
*/
GMainContext *main_context_at_construction;
/* construct properties */
gchar *address;
GDBusConnectionFlags flags;
/* Map used for managing method replies */
GHashTable *map_method_serial_to_send_message_data; /* guint32 -> SendMessageData* */
/* Maps used for managing signal subscription */
GHashTable *map_rule_to_signal_data; /* gchar* -> SignalData */
GHashTable *map_id_to_signal_data; /* guint -> SignalData */
GHashTable *map_sender_to_signal_data_array; /* gchar* -> GPtrArray* of SignalData */
/* Maps used for managing exported objects and subtrees */
GHashTable *map_object_path_to_eo; /* gchar* -> ExportedObject* */
GHashTable *map_id_to_ei; /* guint -> ExportedInterface* */
GHashTable *map_object_path_to_es; /* gchar* -> ExportedSubtree* */
GHashTable *map_id_to_es; /* guint -> ExportedSubtree* */
/* Structure used for message filters */
GPtrArray *filters;
/* Whether to exit on close */
gboolean exit_on_close;
/* Capabilities negotiated during authentication */
GDBusCapabilityFlags capabilities;
GDBusAuthObserver *authentication_observer;
GCredentials *crendentials;
};
typedef struct ExportedObject ExportedObject;
static void exported_object_free (ExportedObject *eo);
typedef struct ExportedSubtree ExportedSubtree;
static void exported_subtree_free (ExportedSubtree *es);
enum
{
CLOSED_SIGNAL,
LAST_SIGNAL,
};
enum
{
PROP_0,
PROP_STREAM,
PROP_ADDRESS,
PROP_FLAGS,
PROP_GUID,
PROP_UNIQUE_NAME,
PROP_CLOSED,
PROP_EXIT_ON_CLOSE,
PROP_CAPABILITY_FLAGS,
PROP_AUTHENTICATION_OBSERVER,
};
static void distribute_signals (GDBusConnection *connection,
GDBusMessage *message);
static void distribute_method_call (GDBusConnection *connection,
GDBusMessage *message);
static gboolean handle_generic_unlocked (GDBusConnection *connection,
GDBusMessage *message);
static void purge_all_signal_subscriptions (GDBusConnection *connection);
static void purge_all_filters (GDBusConnection *connection);
#define _G_ENSURE_LOCK(name) do { \
if (G_UNLIKELY (G_TRYLOCK(name))) \
{ \
g_assertion_message (G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, \
"_G_ENSURE_LOCK: Lock `" #name "' is not locked"); \
} \
} while (FALSE) \
static guint signals[LAST_SIGNAL] = { 0 };
static void initable_iface_init (GInitableIface *initable_iface);
static void async_initable_iface_init (GAsyncInitableIface *async_initable_iface);
G_DEFINE_TYPE_WITH_CODE (GDBusConnection, g_dbus_connection, G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE, initable_iface_init)
G_IMPLEMENT_INTERFACE (G_TYPE_ASYNC_INITABLE, async_initable_iface_init)
);
static void
g_dbus_connection_dispose (GObject *object)
{
GDBusConnection *connection = G_DBUS_CONNECTION (object);
G_LOCK (message_bus_lock);
//g_debug ("disposing %p", connection);
if (connection == the_session_bus)
{
the_session_bus = NULL;
}
else if (connection == the_system_bus)
{
the_system_bus = NULL;
}
if (connection->priv->worker != NULL)
{
_g_dbus_worker_stop (connection->priv->worker);
connection->priv->worker = NULL;
}
G_UNLOCK (message_bus_lock);
if (G_OBJECT_CLASS (g_dbus_connection_parent_class)->dispose != NULL)
G_OBJECT_CLASS (g_dbus_connection_parent_class)->dispose (object);
}
static void
g_dbus_connection_finalize (GObject *object)
{
GDBusConnection *connection = G_DBUS_CONNECTION (object);
if (connection->priv->authentication_observer != NULL)
g_object_unref (connection->priv->authentication_observer);
if (connection->priv->auth != NULL)
g_object_unref (connection->priv->auth);
//g_debug ("finalizing %p", connection);
if (connection->priv->stream != NULL)
{
/* We don't really care if closing the stream succeeds or not */
g_io_stream_close_async (connection->priv->stream,
G_PRIORITY_DEFAULT,
NULL, /* GCancellable */
NULL, /* GAsyncReadyCallback */
NULL); /* userdata */
g_object_unref (connection->priv->stream);
connection->priv->stream = NULL;
}
g_free (connection->priv->address);
g_free (connection->priv->guid);
g_free (connection->priv->bus_unique_name);
if (connection->priv->initialization_error != NULL)
g_error_free (connection->priv->initialization_error);
g_hash_table_unref (connection->priv->map_method_serial_to_send_message_data);
purge_all_signal_subscriptions (connection);
g_hash_table_unref (connection->priv->map_rule_to_signal_data);
g_hash_table_unref (connection->priv->map_id_to_signal_data);
g_hash_table_unref (connection->priv->map_sender_to_signal_data_array);
g_hash_table_unref (connection->priv->map_id_to_ei);
g_hash_table_unref (connection->priv->map_object_path_to_eo);
g_hash_table_unref (connection->priv->map_id_to_es);
g_hash_table_unref (connection->priv->map_object_path_to_es);
purge_all_filters (connection);
g_ptr_array_unref (connection->priv->filters);
if (connection->priv->main_context_at_construction != NULL)
g_main_context_unref (connection->priv->main_context_at_construction);
g_free (connection->priv->machine_id);
g_mutex_free (connection->priv->init_lock);
g_mutex_free (connection->priv->lock);
G_OBJECT_CLASS (g_dbus_connection_parent_class)->finalize (object);
}
static void
g_dbus_connection_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GDBusConnection *connection = G_DBUS_CONNECTION (object);
switch (prop_id)
{
case PROP_STREAM:
g_value_set_object (value, g_dbus_connection_get_stream (connection));
break;
case PROP_GUID:
g_value_set_string (value, g_dbus_connection_get_guid (connection));
break;
case PROP_UNIQUE_NAME:
g_value_set_string (value, g_dbus_connection_get_unique_name (connection));
break;
case PROP_CLOSED:
g_value_set_boolean (value, g_dbus_connection_is_closed (connection));
break;
case PROP_EXIT_ON_CLOSE:
g_value_set_boolean (value, g_dbus_connection_get_exit_on_close (connection));
break;
case PROP_CAPABILITY_FLAGS:
g_value_set_flags (value, g_dbus_connection_get_capabilities (connection));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
g_dbus_connection_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GDBusConnection *connection = G_DBUS_CONNECTION (object);
switch (prop_id)
{
case PROP_STREAM:
connection->priv->stream = g_value_dup_object (value);
break;
case PROP_GUID:
connection->priv->guid = g_value_dup_string (value);
break;
case PROP_ADDRESS:
connection->priv->address = g_value_dup_string (value);
break;
case PROP_FLAGS:
connection->priv->flags = g_value_get_flags (value);
break;
case PROP_EXIT_ON_CLOSE:
g_dbus_connection_set_exit_on_close (connection, g_value_get_boolean (value));
break;
case PROP_AUTHENTICATION_OBSERVER:
connection->priv->authentication_observer = g_value_dup_object (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
g_dbus_connection_real_closed (GDBusConnection *connection,
gboolean remote_peer_vanished,
GError *error)
{
if (remote_peer_vanished && connection->priv->exit_on_close)
{
g_print ("%s: Remote peer vanished. Exiting.\n", G_STRFUNC);
raise (SIGTERM);
}
}
static void
g_dbus_connection_class_init (GDBusConnectionClass *klass)
{
GObjectClass *gobject_class;
g_type_class_add_private (klass, sizeof (GDBusConnectionPrivate));
gobject_class = G_OBJECT_CLASS (klass);
gobject_class->finalize = g_dbus_connection_finalize;
gobject_class->dispose = g_dbus_connection_dispose;
gobject_class->set_property = g_dbus_connection_set_property;
gobject_class->get_property = g_dbus_connection_get_property;
klass->closed = g_dbus_connection_real_closed;
/**
* GDBusConnection:stream:
*
* The underlying #GIOStream used for I/O.
*
* Since: 2.26
*/
g_object_class_install_property (gobject_class,
PROP_STREAM,
g_param_spec_object ("stream",
P_("IO Stream"),
P_("The underlying streams used for I/O"),
G_TYPE_IO_STREAM,
G_PARAM_READABLE |
G_PARAM_WRITABLE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_NAME |
G_PARAM_STATIC_BLURB |
G_PARAM_STATIC_NICK));
/**
* GDBusConnection:address:
*
* A D-Bus address specifying potential endpoints that can be used
* when establishing the connection.
*
* Since: 2.26
*/
g_object_class_install_property (gobject_class,
PROP_ADDRESS,
g_param_spec_string ("address",
P_("Address"),
P_("D-Bus address specifying potential socket endpoints"),
NULL,
G_PARAM_WRITABLE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_NAME |
G_PARAM_STATIC_BLURB |
G_PARAM_STATIC_NICK));
/**
* GDBusConnection:flags:
*
* Flags from the #GDBusConnectionFlags enumeration.
*
* Since: 2.26
*/
g_object_class_install_property (gobject_class,
PROP_FLAGS,
g_param_spec_flags ("flags",
P_("Flags"),
P_("Flags"),
G_TYPE_DBUS_CONNECTION_FLAGS,
G_DBUS_CONNECTION_FLAGS_NONE,
G_PARAM_WRITABLE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_NAME |
G_PARAM_STATIC_BLURB |
G_PARAM_STATIC_NICK));
/**
* GDBusConnection:guid:
*
* The GUID of the peer performing the role of server when
* authenticating.
*
* If you are constructing a #GDBusConnection and pass
* %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER in the
* #GDBusConnection:flags property then you MUST also set this
* property to a valid guid.
*
* If you are constructing a #GDBusConnection and pass
* %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT in the
* #GDBusConnection:flags property you will be able to read the GUID
* of the other peer here after the connection has been successfully
* initialized.
*
* Since: 2.26
*/
g_object_class_install_property (gobject_class,
PROP_GUID,
g_param_spec_string ("guid",
P_("GUID"),
P_("GUID of the server peer"),
NULL,
G_PARAM_READABLE |
G_PARAM_WRITABLE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_NAME |
G_PARAM_STATIC_BLURB |
G_PARAM_STATIC_NICK));
/**
* GDBusConnection:unique-name:
*
* The unique name as assigned by the message bus or %NULL if the
* connection is not open or not a message bus connection.
*
* Since: 2.26
*/
g_object_class_install_property (gobject_class,
PROP_UNIQUE_NAME,
g_param_spec_string ("unique-name",
P_("unique-name"),
P_("Unique name of bus connection"),
NULL,
G_PARAM_READABLE |
G_PARAM_STATIC_NAME |
G_PARAM_STATIC_BLURB |
G_PARAM_STATIC_NICK));
/**
* GDBusConnection:closed:
*
* A boolean specifying whether the connection has been closed.
*
* Since: 2.26
*/
g_object_class_install_property (gobject_class,
PROP_CLOSED,
g_param_spec_boolean ("closed",
P_("Closed"),
P_("Whether the connection is closed"),
FALSE,
G_PARAM_READABLE |
G_PARAM_STATIC_NAME |
G_PARAM_STATIC_BLURB |
G_PARAM_STATIC_NICK));
/**
* GDBusConnection:exit-on-close:
*
* A boolean specifying whether the process will be terminated (by
* calling <literal>raise(SIGTERM)</literal>) if the connection
* is closed by the remote peer.
*
* Since: 2.26
*/
g_object_class_install_property (gobject_class,
PROP_EXIT_ON_CLOSE,
g_param_spec_boolean ("exit-on-close",
P_("Exit on close"),
P_("Whether the process is terminated when the connection is closed"),
FALSE,
G_PARAM_READABLE |
G_PARAM_WRITABLE |
G_PARAM_STATIC_NAME |
G_PARAM_STATIC_BLURB |
G_PARAM_STATIC_NICK));
/**
* GDBusConnection:capabilities:
*
* Flags from the #GDBusCapabilityFlags enumeration
* representing connection features negotiated with the other peer.
*
* Since: 2.26
*/
g_object_class_install_property (gobject_class,
PROP_CAPABILITY_FLAGS,
g_param_spec_flags ("capabilities",
P_("Capabilities"),
P_("Capabilities"),
G_TYPE_DBUS_CAPABILITY_FLAGS,
G_DBUS_CAPABILITY_FLAGS_NONE,
G_PARAM_READABLE |
G_PARAM_STATIC_NAME |
G_PARAM_STATIC_BLURB |
G_PARAM_STATIC_NICK));
/**
* GDBusConnection:authentication-observer:
*
* A #GDBusAuthObserver object to assist in the authentication process or %NULL.
*
* Since: 2.26
*/
g_object_class_install_property (gobject_class,
PROP_AUTHENTICATION_OBSERVER,
g_param_spec_object ("authentication-observer",
P_("Authentication Observer"),
P_("Object used to assist in the authentication process"),
G_TYPE_DBUS_AUTH_OBSERVER,
G_PARAM_WRITABLE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_NAME |
G_PARAM_STATIC_BLURB |
G_PARAM_STATIC_NICK));
/**
* GDBusConnection::closed:
* @connection: The #GDBusConnection emitting the signal.
* @remote_peer_vanished: %TRUE if @connection is closed because the
* remote peer closed its end of the connection.
* @error: A #GError with more details about the event or %NULL.
*
* Emitted when the connection is closed.
*
* The cause of this event can be
* <itemizedlist>
* <listitem><para>
* If g_dbus_connection_close() is called. In this case
* @remote_peer_vanished is set to %FALSE and @error is %NULL.
* </para></listitem>
* <listitem><para>
* If the remote peer closes the connection. In this case
* @remote_peer_vanished is set to %TRUE and @error is set.
* </para></listitem>
* <listitem><para>
* If the remote peer sends invalid or malformed data. In this
* case @remote_peer_vanished is set to %FALSE and @error
* is set.
* </para></listitem>
* </itemizedlist>
*
* Upon receiving this signal, you should give up your reference to
* @connection. You are guaranteed that this signal is emitted only
* once.
*
* Since: 2.26
*/
signals[CLOSED_SIGNAL] = g_signal_new ("closed",
G_TYPE_DBUS_CONNECTION,
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GDBusConnectionClass, closed),
NULL,
NULL,
_gio_marshal_VOID__BOOLEAN_BOXED,
G_TYPE_NONE,
2,
G_TYPE_BOOLEAN,
G_TYPE_ERROR);
}
static void
g_dbus_connection_init (GDBusConnection *connection)
{
connection->priv = G_TYPE_INSTANCE_GET_PRIVATE (connection, G_TYPE_DBUS_CONNECTION, GDBusConnectionPrivate);
connection->priv->lock = g_mutex_new ();
connection->priv->init_lock = g_mutex_new ();
connection->priv->map_method_serial_to_send_message_data = g_hash_table_new (g_direct_hash, g_direct_equal);
connection->priv->map_rule_to_signal_data = g_hash_table_new (g_str_hash,
g_str_equal);
connection->priv->map_id_to_signal_data = g_hash_table_new (g_direct_hash,
g_direct_equal);
connection->priv->map_sender_to_signal_data_array = g_hash_table_new_full (g_str_hash,
g_str_equal,
g_free,
NULL);
connection->priv->map_object_path_to_eo = g_hash_table_new_full (g_str_hash,
g_str_equal,
NULL,
(GDestroyNotify) exported_object_free);
connection->priv->map_id_to_ei = g_hash_table_new (g_direct_hash,
g_direct_equal);
connection->priv->map_object_path_to_es = g_hash_table_new_full (g_str_hash,
g_str_equal,
NULL,
(GDestroyNotify) exported_subtree_free);
connection->priv->map_id_to_es = g_hash_table_new (g_direct_hash,
g_direct_equal);
connection->priv->main_context_at_construction = g_main_context_get_thread_default ();
if (connection->priv->main_context_at_construction != NULL)
g_main_context_ref (connection->priv->main_context_at_construction);
connection->priv->filters = g_ptr_array_new ();
}
/**
* g_dbus_connection_get_stream:
* @connection: a #GDBusConnection
*
* Gets the underlying stream used for IO.
*
* Returns: the stream used for IO
*
* Since: 2.26
*/
GIOStream *
g_dbus_connection_get_stream (GDBusConnection *connection)
{
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
return connection->priv->stream;
}
/**
* g_dbus_connection_is_closed:
* @connection: A #GDBusConnection.
*
* Gets whether @connection is closed.
*
* Returns: %TRUE if the connection is closed, %FALSE otherwise.
*
* Since: 2.26
*/
gboolean
g_dbus_connection_is_closed (GDBusConnection *connection)
{
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
return connection->priv->closed;
}
/**
* g_dbus_connection_get_capabilities:
* @connection: A #GDBusConnection.
*
* Gets the capabilities negotiated with the remote peer
*
* Returns: Zero or more flags from the #GDBusCapabilityFlags enumeration.
*
* Since: 2.26
*/
GDBusCapabilityFlags
g_dbus_connection_get_capabilities (GDBusConnection *connection)
{
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), G_DBUS_CAPABILITY_FLAGS_NONE);
return connection->priv->capabilities;
}
/* ---------------------------------------------------------------------------------------------------- */
typedef struct
{
GDBusConnection *connection;
GError *error;
gboolean remote_peer_vanished;
} EmitClosedData;
static void
emit_closed_data_free (EmitClosedData *data)
{
g_object_unref (data->connection);
if (data->error != NULL)
g_error_free (data->error);
g_free (data);
}
static gboolean
emit_closed_in_idle (gpointer user_data)
{
EmitClosedData *data = user_data;
gboolean result;
g_object_notify (G_OBJECT (data->connection), "closed");
g_signal_emit (data->connection,
signals[CLOSED_SIGNAL],
0,
data->remote_peer_vanished,
data->error,
&result);
return FALSE;
}
/* Can be called from any thread, must hold lock */
static void
set_closed_unlocked (GDBusConnection *connection,
gboolean remote_peer_vanished,
GError *error)
{
GSource *idle_source;
EmitClosedData *data;
CONNECTION_ENSURE_LOCK (connection);
g_assert (!connection->priv->closed);
connection->priv->closed = TRUE;
data = g_new0 (EmitClosedData, 1);
data->connection = g_object_ref (connection);
data->remote_peer_vanished = remote_peer_vanished;
data->error = error != NULL ? g_error_copy (error) : NULL;
idle_source = g_idle_source_new ();
g_source_set_priority (idle_source, G_PRIORITY_DEFAULT);
g_source_set_callback (idle_source,
emit_closed_in_idle,
data,
(GDestroyNotify) emit_closed_data_free);
g_source_attach (idle_source, connection->priv->main_context_at_construction);
g_source_unref (idle_source);
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_connection_close:
* @connection: A #GDBusConnection.
*
* Closes @connection. Note that this never causes the process to
* exit (this might only happen if the other end of a shared message
* bus connection disconnects).
*
* If @connection is already closed, this method does nothing.
*
* Since: 2.26
*/
void
g_dbus_connection_close (GDBusConnection *connection)
{
g_return_if_fail (G_IS_DBUS_CONNECTION (connection));
CONNECTION_LOCK (connection);
if (!connection->priv->closed)
{
GError *error = NULL;
/* TODO: do this async */
//g_debug ("closing connection %p's stream %p", connection, connection->priv->stream);
if (!g_io_stream_close (connection->priv->stream, NULL, &error))
{
g_warning ("Error closing stream: %s", error->message);
g_error_free (error);
}
set_closed_unlocked (connection, FALSE, NULL);
}
CONNECTION_UNLOCK (connection);
}
/* ---------------------------------------------------------------------------------------------------- */
static gboolean
g_dbus_connection_send_message_unlocked (GDBusConnection *connection,
GDBusMessage *message,
volatile guint32 *out_serial,
GError **error)
{
guchar *blob;
gsize blob_size;
guint32 serial_to_use;
gboolean ret;
CONNECTION_ENSURE_LOCK (connection);
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), FALSE);
/* TODO: check all necessary headers are present */
ret = FALSE;
blob = NULL;
if (out_serial != NULL)
*out_serial = 0;
if (connection->priv->closed)
{
g_set_error_literal (error,
G_IO_ERROR,
G_IO_ERROR_CLOSED,
_("The connection is closed"));
goto out;
}
blob = g_dbus_message_to_blob (message,
&blob_size,
connection->priv->capabilities,
error);
if (blob == NULL)
goto out;
serial_to_use = ++connection->priv->last_serial; /* TODO: handle overflow */
switch (blob[0])
{
case 'l':
((guint32 *) blob)[2] = GUINT32_TO_LE (serial_to_use);
break;
case 'B':
((guint32 *) blob)[2] = GUINT32_TO_BE (serial_to_use);
break;
default:
g_assert_not_reached ();
break;
}
#if 0
g_printerr ("Writing message of %" G_GSIZE_FORMAT " bytes (serial %d) on %p:\n",
blob_size, serial_to_use, connection);
g_printerr ("----\n");
hexdump (blob, blob_size);
g_printerr ("----\n");
#endif
/* TODO: use connection->priv->auth to encode the blob */
if (out_serial != NULL)
*out_serial = serial_to_use;
g_dbus_message_set_serial (message, serial_to_use);
_g_dbus_worker_send_message (connection->priv->worker,
message,
(gchar*) blob,
blob_size);
blob = NULL; /* since _g_dbus_worker_send_message() steals the blob */
ret = TRUE;
out:
g_free (blob);
return ret;
}
/**
* g_dbus_connection_send_message:
* @connection: A #GDBusConnection.
* @message: A #GDBusMessage
* @out_serial: Return location for serial number assigned to @message when sending it or %NULL.
* @error: Return location for error or %NULL.
*
* Asynchronously sends @message to the peer represented by @connection.
*
* If @out_serial is not %NULL, then the serial number assigned to
* @message by @connection will be written to this location prior to
* submitting the message to the underlying transport.
*
* If @connection is closed then the operation will fail with
* %G_IO_ERROR_CLOSED. If @cancellable is canceled, the operation will
* fail with %G_IO_ERROR_CANCELLED. If @message is not well-formed,
* the operation fails with %G_IO_ERROR_INVALID_ARGUMENT.
*
* See <xref linkend="gdbus-server"/> and <xref
* linkend="gdbus-unix-fd-client"/> for an example of how to use this
* low-level API to send and receive UNIX file descriptors.
*
* Returns: %TRUE if the message was well-formed and queued for
* transmission, %FALSE if @error is set.
*
* Since: 2.26
*/
gboolean
g_dbus_connection_send_message (GDBusConnection *connection,
GDBusMessage *message,
volatile guint32 *out_serial,
GError **error)
{
gboolean ret;
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
CONNECTION_LOCK (connection);
ret = g_dbus_connection_send_message_unlocked (connection, message, out_serial, error);
CONNECTION_UNLOCK (connection);
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
typedef struct
{
volatile gint ref_count;
GDBusConnection *connection;
guint32 serial;
GSimpleAsyncResult *simple;
GMainContext *main_context;
GCancellable *cancellable;
gulong cancellable_handler_id;
GSource *timeout_source;
gboolean delivered;
} SendMessageData;
static SendMessageData *
send_message_data_ref (SendMessageData *data)
{
g_atomic_int_inc (&data->ref_count);
return data;
}
static void
send_message_data_unref (SendMessageData *data)
{
if (g_atomic_int_dec_and_test (&data->ref_count))
{
g_assert (data->timeout_source == NULL);
g_assert (data->simple == NULL);
g_assert (data->cancellable_handler_id == 0);
g_object_unref (data->connection);
if (data->cancellable != NULL)
g_object_unref (data->cancellable);
if (data->main_context != NULL)
g_main_context_unref (data->main_context);
g_free (data);
}
}
/* ---------------------------------------------------------------------------------------------------- */
/* can be called from any thread with lock held - caller must have prepared GSimpleAsyncResult already */
static void
send_message_with_reply_deliver (SendMessageData *data)
{
CONNECTION_ENSURE_LOCK (data->connection);
g_assert (!data->delivered);
data->delivered = TRUE;
g_simple_async_result_complete_in_idle (data->simple);
g_object_unref (data->simple);
data->simple = NULL;
if (data->timeout_source != NULL)
{
g_source_destroy (data->timeout_source);
data->timeout_source = NULL;
}
if (data->cancellable_handler_id > 0)
{
g_cancellable_disconnect (data->cancellable, data->cancellable_handler_id);
data->cancellable_handler_id = 0;
}
g_warn_if_fail (g_hash_table_remove (data->connection->priv->map_method_serial_to_send_message_data,
GUINT_TO_POINTER (data->serial)));
send_message_data_unref (data);
}
/* ---------------------------------------------------------------------------------------------------- */
/* must hold lock */
static void
send_message_data_deliver_reply_unlocked (SendMessageData *data,
GDBusMessage *reply)
{
if (data->delivered)
goto out;
g_simple_async_result_set_op_res_gpointer (data->simple,
g_object_ref (reply),
g_object_unref);
send_message_with_reply_deliver (data);
out:
;
}
/* ---------------------------------------------------------------------------------------------------- */
static gboolean
send_message_with_reply_cancelled_idle_cb (gpointer user_data)
{
SendMessageData *data = user_data;
CONNECTION_LOCK (data->connection);
if (data->delivered)
goto out;
g_simple_async_result_set_error (data->simple,
G_IO_ERROR,
G_IO_ERROR_CANCELLED,
_("Operation was cancelled"));
send_message_with_reply_deliver (data);
out:
CONNECTION_UNLOCK (data->connection);
return FALSE;
}
/* Can be called from any thread with or without lock held */
static void
send_message_with_reply_cancelled_cb (GCancellable *cancellable,
gpointer user_data)
{
SendMessageData *data = user_data;
GSource *idle_source;
/* postpone cancellation to idle handler since we may be called directly
* via g_cancellable_connect() (e.g. holding lock)
*/
idle_source = g_idle_source_new ();
g_source_set_priority (idle_source, G_PRIORITY_DEFAULT);
g_source_set_callback (idle_source,
send_message_with_reply_cancelled_idle_cb,
send_message_data_ref (data),
(GDestroyNotify) send_message_data_unref);
g_source_attach (idle_source, data->main_context);
g_source_unref (idle_source);
}
/* ---------------------------------------------------------------------------------------------------- */
static gboolean
send_message_with_reply_timeout_cb (gpointer user_data)
{
SendMessageData *data = user_data;
CONNECTION_LOCK (data->connection);
if (data->delivered)
goto out;
g_simple_async_result_set_error (data->simple,
G_IO_ERROR,
G_IO_ERROR_TIMED_OUT,
_("Timeout was reached"));
send_message_with_reply_deliver (data);
out:
CONNECTION_UNLOCK (data->connection);
return FALSE;
}
/* ---------------------------------------------------------------------------------------------------- */
static void
g_dbus_connection_send_message_with_reply_unlocked (GDBusConnection *connection,
GDBusMessage *message,
gint timeout_msec,
volatile guint32 *out_serial,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GSimpleAsyncResult *simple;
SendMessageData *data;
GError *error;
volatile guint32 serial;
data = NULL;
if (out_serial == NULL)
out_serial = &serial;
if (timeout_msec == -1)
timeout_msec = 25 * 1000;
simple = g_simple_async_result_new (G_OBJECT (connection),
callback,
user_data,
g_dbus_connection_send_message_with_reply);
if (g_cancellable_is_cancelled (cancellable))
{
g_simple_async_result_set_error (simple,
G_IO_ERROR,
G_IO_ERROR_CANCELLED,
_("Operation was cancelled"));
g_simple_async_result_complete_in_idle (simple);
g_object_unref (simple);
goto out;
}
if (connection->priv->closed)
{
g_simple_async_result_set_error (simple,
G_IO_ERROR,
G_IO_ERROR_CLOSED,
_("The connection is closed"));
g_simple_async_result_complete_in_idle (simple);
g_object_unref (simple);
goto out;
}
error = NULL;
if (!g_dbus_connection_send_message_unlocked (connection, message, out_serial, &error))
{
g_simple_async_result_set_from_error (simple, error);
g_simple_async_result_complete_in_idle (simple);
g_object_unref (simple);
goto out;
}
data = g_new0 (SendMessageData, 1);
data->ref_count = 1;
data->connection = g_object_ref (connection);
data->simple = simple;
data->serial = *out_serial;
data->main_context = g_main_context_get_thread_default ();
if (data->main_context != NULL)
g_main_context_ref (data->main_context);
if (cancellable != NULL)
{
data->cancellable = g_object_ref (cancellable);
data->cancellable_handler_id = g_cancellable_connect (cancellable,
G_CALLBACK (send_message_with_reply_cancelled_cb),
send_message_data_ref (data),
(GDestroyNotify) send_message_data_unref);
g_object_set_data_full (G_OBJECT (simple),
"cancellable",
g_object_ref (cancellable),
(GDestroyNotify) g_object_unref);
}
data->timeout_source = g_timeout_source_new (timeout_msec);
g_source_set_priority (data->timeout_source, G_PRIORITY_DEFAULT);
g_source_set_callback (data->timeout_source,
send_message_with_reply_timeout_cb,
send_message_data_ref (data),
(GDestroyNotify) send_message_data_unref);
g_source_attach (data->timeout_source, data->main_context);
g_source_unref (data->timeout_source);
g_hash_table_insert (connection->priv->map_method_serial_to_send_message_data,
GUINT_TO_POINTER (*out_serial),
data);
out:
;
}
/**
* g_dbus_connection_send_message_with_reply:
* @connection: A #GDBusConnection.
* @message: A #GDBusMessage.
* @timeout_msec: The timeout in milliseconds or -1 to use the default timeout.
* @out_serial: Return location for serial number assigned to @message when sending it or %NULL.
* @cancellable: A #GCancellable or %NULL.
* @callback: A #GAsyncReadyCallback to call when the request is satisfied or %NULL if you don't
* care about the result.
* @user_data: The data to pass to @callback.
*
* Asynchronously sends @message to the peer represented by @connection.
*
* If @out_serial is not %NULL, then the serial number assigned to
* @message by @connection will be written to this location prior to
* submitting the message to the underlying transport.
*
* If @connection is closed then the operation will fail with
* %G_IO_ERROR_CLOSED. If @cancellable is canceled, the operation will
* fail with %G_IO_ERROR_CANCELLED. If @message is not well-formed,
* the operation fails with %G_IO_ERROR_INVALID_ARGUMENT.
*
* This is an asynchronous method. When the operation is finished, @callback will be invoked
* in the <link linkend="g-main-context-push-thread-default">thread-default main loop</link>
* of the thread you are calling this method from. You can then call
* g_dbus_connection_send_message_with_reply_finish() to get the result of the operation.
* See g_dbus_connection_send_message_with_reply_sync() for the synchronous version.
*
* See <xref linkend="gdbus-server"/> and <xref
* linkend="gdbus-unix-fd-client"/> for an example of how to use this
* low-level API to send and receive UNIX file descriptors.
*
* Since: 2.26
*/
void
g_dbus_connection_send_message_with_reply (GDBusConnection *connection,
GDBusMessage *message,
gint timeout_msec,
volatile guint32 *out_serial,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
g_return_if_fail (G_IS_DBUS_CONNECTION (connection));
g_return_if_fail (G_IS_DBUS_MESSAGE (message));
g_return_if_fail (timeout_msec >= 0 || timeout_msec == -1);
CONNECTION_LOCK (connection);
g_dbus_connection_send_message_with_reply_unlocked (connection,
message,
timeout_msec,
out_serial,
cancellable,
callback,
user_data);
CONNECTION_UNLOCK (connection);
}
/**
* g_dbus_connection_send_message_with_reply_finish:
* @connection: a #GDBusConnection
* @res: A #GAsyncResult obtained from the #GAsyncReadyCallback passed to g_dbus_connection_send_message_with_reply().
* @error: Return location for error or %NULL.
*
* Finishes an operation started with g_dbus_connection_send_message_with_reply().
*
* Note that @error is only set if a local in-process error
* occured. That is to say that the returned #GDBusMessage object may
* be of type %G_DBUS_MESSAGE_TYPE_ERROR. Use
* g_dbus_message_to_gerror() to transcode this to a #GError.
*
* See <xref linkend="gdbus-server"/> and <xref
* linkend="gdbus-unix-fd-client"/> for an example of how to use this
* low-level API to send and receive UNIX file descriptors.
*
* Returns: A #GDBusMessage or %NULL if @error is set.
*
* Since: 2.26
*/
GDBusMessage *
g_dbus_connection_send_message_with_reply_finish (GDBusConnection *connection,
GAsyncResult *res,
GError **error)
{
GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (res);
GDBusMessage *reply;
GCancellable *cancellable;
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
reply = NULL;
g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == g_dbus_connection_send_message_with_reply);
if (g_simple_async_result_propagate_error (simple, error))
goto out;
reply = g_object_ref (g_simple_async_result_get_op_res_gpointer (simple));
cancellable = g_object_get_data (G_OBJECT (simple), "cancellable");
if (cancellable != NULL && g_cancellable_is_cancelled (cancellable))
{
g_object_unref (reply);
reply = NULL;
g_set_error_literal (error,
G_IO_ERROR,
G_IO_ERROR_CANCELLED,
_("Operation was cancelled"));
}
out:
return reply;
}
/* ---------------------------------------------------------------------------------------------------- */
typedef struct
{
GAsyncResult *res;
GMainContext *context;
GMainLoop *loop;
} SendMessageSyncData;
static void
send_message_with_reply_sync_cb (GDBusConnection *connection,
GAsyncResult *res,
gpointer user_data)
{
SendMessageSyncData *data = user_data;
data->res = g_object_ref (res);
g_main_loop_quit (data->loop);
}
/**
* g_dbus_connection_send_message_with_reply_sync:
* @connection: A #GDBusConnection.
* @message: A #GDBusMessage.
* @timeout_msec: The timeout in milliseconds or -1 to use the default timeout.
* @out_serial: Return location for serial number assigned to @message when sending it or %NULL.
* @cancellable: A #GCancellable or %NULL.
* @error: Return location for error or %NULL.
*
* Synchronously sends @message to the peer represented by @connection
* and blocks the calling thread until a reply is received or the
* timeout is reached. See g_dbus_connection_send_message_with_reply()
* for the asynchronous version of this method.
*
* If @out_serial is not %NULL, then the serial number assigned to
* @message by @connection will be written to this location prior to
* submitting the message to the underlying transport.
*
* If @connection is closed then the operation will fail with
* %G_IO_ERROR_CLOSED. If @cancellable is canceled, the operation will
* fail with %G_IO_ERROR_CANCELLED. If @message is not well-formed,
* the operation fails with %G_IO_ERROR_INVALID_ARGUMENT.
*
* Note that @error is only set if a local in-process error
* occured. That is to say that the returned #GDBusMessage object may
* be of type %G_DBUS_MESSAGE_TYPE_ERROR. Use
* g_dbus_message_to_gerror() to transcode this to a #GError.
*
* See <xref linkend="gdbus-server"/> and <xref
* linkend="gdbus-unix-fd-client"/> for an example of how to use this
* low-level API to send and receive UNIX file descriptors.
*
* Returns: A #GDBusMessage that is the reply to @message or %NULL if @error is set.
*
* Since: 2.26
*/
GDBusMessage *
g_dbus_connection_send_message_with_reply_sync (GDBusConnection *connection,
GDBusMessage *message,
gint timeout_msec,
volatile guint32 *out_serial,
GCancellable *cancellable,
GError **error)
{
SendMessageSyncData *data;
GDBusMessage *reply;
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), NULL);
g_return_val_if_fail (timeout_msec >= 0 || timeout_msec == -1, NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
data = g_new0 (SendMessageSyncData, 1);
data->context = g_main_context_new ();
data->loop = g_main_loop_new (data->context, FALSE);
g_main_context_push_thread_default (data->context);
g_dbus_connection_send_message_with_reply (connection,
message,
timeout_msec,
out_serial,
cancellable,
(GAsyncReadyCallback) send_message_with_reply_sync_cb,
data);
g_main_loop_run (data->loop);
reply = g_dbus_connection_send_message_with_reply_finish (connection,
data->res,
error);
g_main_context_pop_thread_default (data->context);
g_main_context_unref (data->context);
g_main_loop_unref (data->loop);
g_object_unref (data->res);
g_free (data);
return reply;
}
/* ---------------------------------------------------------------------------------------------------- */
typedef struct
{
GDBusMessageFilterFunction func;
gpointer user_data;
} FilterCallback;
typedef struct
{
guint id;
GDBusMessageFilterFunction filter_function;
gpointer user_data;
GDestroyNotify user_data_free_func;
} FilterData;
/* Called in worker's thread - we must not block */
static void
on_worker_message_received (GDBusWorker *worker,
GDBusMessage *message,
gpointer user_data)
{
GDBusConnection *connection = G_DBUS_CONNECTION (user_data);
FilterCallback *filters;
gboolean consumed_by_filter;
guint num_filters;
guint n;
//g_debug ("in on_worker_message_received");
g_object_ref (connection);
/* First collect the set of callback functions */
CONNECTION_LOCK (connection);
num_filters = connection->priv->filters->len;
filters = g_new0 (FilterCallback, num_filters);
for (n = 0; n < num_filters; n++)
{
FilterData *data = connection->priv->filters->pdata[n];
filters[n].func = data->filter_function;
filters[n].user_data = data->user_data;
}
CONNECTION_UNLOCK (connection);
/* the call the filters in order (without holding the lock) */
consumed_by_filter = FALSE;
for (n = 0; n < num_filters; n++)
{
consumed_by_filter = filters[n].func (connection,
message,
filters[n].user_data);
if (consumed_by_filter)
break;
}
/* Standard dispatch unless the filter ate the message */
if (!consumed_by_filter)
{
GDBusMessageType message_type;
message_type = g_dbus_message_get_message_type (message);
if (message_type == G_DBUS_MESSAGE_TYPE_METHOD_RETURN || message_type == G_DBUS_MESSAGE_TYPE_ERROR)
{
guint32 reply_serial;
SendMessageData *send_message_data;
reply_serial = g_dbus_message_get_reply_serial (message);
CONNECTION_LOCK (connection);
send_message_data = g_hash_table_lookup (connection->priv->map_method_serial_to_send_message_data,
GUINT_TO_POINTER (reply_serial));
if (send_message_data != NULL)
{
//g_debug ("delivering reply/error for serial %d for %p", reply_serial, connection);
send_message_data_deliver_reply_unlocked (send_message_data, message);
}
else
{
//g_debug ("message reply/error for serial %d but no SendMessageData found for %p", reply_serial, connection);
}
CONNECTION_UNLOCK (connection);
}
else if (message_type == G_DBUS_MESSAGE_TYPE_SIGNAL)
{
CONNECTION_LOCK (connection);
distribute_signals (connection, message);
CONNECTION_UNLOCK (connection);
}
else if (message_type == G_DBUS_MESSAGE_TYPE_METHOD_CALL)
{
CONNECTION_LOCK (connection);
distribute_method_call (connection, message);
CONNECTION_UNLOCK (connection);
}
}
g_object_unref (connection);
g_free (filters);
}
/* Called in worker's thread - we must not block */
static void
on_worker_closed (GDBusWorker *worker,
gboolean remote_peer_vanished,
GError *error,
gpointer user_data)
{
GDBusConnection *connection = G_DBUS_CONNECTION (user_data);
//g_debug ("in on_worker_closed: %s", error->message);
CONNECTION_LOCK (connection);
if (!connection->priv->closed)
set_closed_unlocked (connection, remote_peer_vanished, error);
CONNECTION_UNLOCK (connection);
}
/* ---------------------------------------------------------------------------------------------------- */
/* Determines the biggest set of capabilities we can support on this connection */
static GDBusCapabilityFlags
get_offered_capabilities_max (GDBusConnection *connection)
{
GDBusCapabilityFlags ret;
ret = G_DBUS_CAPABILITY_FLAGS_NONE;
#ifdef G_OS_UNIX
if (G_IS_UNIX_CONNECTION (connection->priv->stream))
ret |= G_DBUS_CAPABILITY_FLAGS_UNIX_FD_PASSING;
#endif
return ret;
}
static gboolean
initable_init (GInitable *initable,
GCancellable *cancellable,
GError **error)
{
GDBusConnection *connection = G_DBUS_CONNECTION (initable);
gboolean ret;
/* This method needs to be idempotent to work with the singleton
* pattern. See the docs for g_initable_init(). We implement this by
* locking.
*
* Unfortunately we can't use the main lock since the on_worker_*()
* callbacks above needs the lock during initialization (for message
* bus connections we do a synchronous Hello() call on the bus).
*/
g_mutex_lock (connection->priv->init_lock);
ret = FALSE;
if (connection->priv->is_initialized)
{
if (connection->priv->stream != NULL)
ret = TRUE;
else
g_assert (connection->priv->initialization_error != NULL);
goto out;
}
g_assert (connection->priv->initialization_error == NULL);
/* The user can pass multiple (but mutally exclusive) construct
* properties:
*
* - stream (of type GIOStream)
* - address (of type gchar*)
*
* At the end of the day we end up with a non-NULL GIOStream
* object in connection->priv->stream.
*/
if (connection->priv->address != NULL)
{
g_assert (connection->priv->stream == NULL);
if ((connection->priv->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER) ||
(connection->priv->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS))
{
g_set_error_literal (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Unsupported flags encountered when constructing a client-side connection"));
goto out;
}
connection->priv->stream = g_dbus_address_get_stream_sync (connection->priv->address,
NULL, /* TODO: out_guid */
cancellable,
&connection->priv->initialization_error);
if (connection->priv->stream == NULL)
goto out;
}
else if (connection->priv->stream != NULL)
{
/* nothing to do */
}
else
{
g_assert_not_reached ();
}
/* Authenticate the connection */
if (connection->priv->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER)
{
g_assert (!(connection->priv->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT));
g_assert (connection->priv->guid != NULL);
connection->priv->auth = _g_dbus_auth_new (connection->priv->stream);
if (!_g_dbus_auth_run_server (connection->priv->auth,
connection->priv->authentication_observer,
connection->priv->guid,
(connection->priv->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS),
get_offered_capabilities_max (connection),
&connection->priv->capabilities,
&connection->priv->crendentials,
cancellable,
&connection->priv->initialization_error))
goto out;
}
else if (connection->priv->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT)
{
g_assert (!(connection->priv->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER));
g_assert (connection->priv->guid == NULL);
connection->priv->auth = _g_dbus_auth_new (connection->priv->stream);
connection->priv->guid = _g_dbus_auth_run_client (connection->priv->auth,
get_offered_capabilities_max (connection),
&connection->priv->capabilities,
cancellable,
&connection->priv->initialization_error);
if (connection->priv->guid == NULL)
goto out;
}
if (connection->priv->authentication_observer != NULL)
{
g_object_unref (connection->priv->authentication_observer);
connection->priv->authentication_observer = NULL;
}
//g_output_stream_flush (G_SOCKET_CONNECTION (connection->priv->stream)
//g_debug ("haz unix fd passing powers: %d", connection->priv->capabilities & G_DBUS_CAPABILITY_FLAGS_UNIX_FD_PASSING);
/* Hack used until
*
* https://bugzilla.gnome.org/show_bug.cgi?id=616458
*
* has been resolved
*/
if (G_IS_SOCKET_CONNECTION (connection->priv->stream))
{
g_socket_set_blocking (g_socket_connection_get_socket (G_SOCKET_CONNECTION (connection->priv->stream)), FALSE);
}
connection->priv->worker = _g_dbus_worker_new (connection->priv->stream,
connection->priv->capabilities,
on_worker_message_received,
on_worker_closed,
connection);
/* if a bus connection, invoke org.freedesktop.DBus.Hello - this is how we're getting a name */
if (connection->priv->flags & G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION)
{
GVariant *hello_result;
hello_result = g_dbus_connection_call_sync (connection,
"org.freedesktop.DBus", /* name */
"/org/freedesktop/DBus", /* path */
"org.freedesktop.DBus", /* interface */
"Hello",
NULL, /* parameters */
G_DBUS_CALL_FLAGS_NONE,
-1,
NULL, /* TODO: cancellable */
&connection->priv->initialization_error);
if (hello_result == NULL)
goto out;
g_variant_get (hello_result, "(s)", &connection->priv->bus_unique_name);
g_variant_unref (hello_result);
//g_debug ("unique name is `%s'", connection->priv->bus_unique_name);
}
connection->priv->is_initialized = TRUE;
ret = TRUE;
out:
if (!ret)
{
g_assert (connection->priv->initialization_error != NULL);
g_propagate_error (error, g_error_copy (connection->priv->initialization_error));
}
g_mutex_unlock (connection->priv->init_lock);
return ret;
}
static void
initable_iface_init (GInitableIface *initable_iface)
{
initable_iface->init = initable_init;
}
/* ---------------------------------------------------------------------------------------------------- */
static void
async_init_thread (GSimpleAsyncResult *res,
GObject *object,
GCancellable *cancellable)
{
GError *error = NULL;
if (!g_initable_init (G_INITABLE (object), cancellable, &error))
{
g_simple_async_result_set_from_error (res, error);
g_error_free (error);
}
}
static void
async_initable_init_async (GAsyncInitable *initable,
gint io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GSimpleAsyncResult *res;
g_return_if_fail (G_IS_INITABLE (initable));
res = g_simple_async_result_new (G_OBJECT (initable), callback, user_data,
async_initable_init_async);
g_simple_async_result_run_in_thread (res, async_init_thread,
io_priority, cancellable);
g_object_unref (res);
}
static gboolean
async_initable_init_finish (GAsyncInitable *initable,
GAsyncResult *res,
GError **error)
{
return TRUE; /* Errors handled by base impl */
}
static void
async_initable_iface_init (GAsyncInitableIface *async_initable_iface)
{
/* We basically just want to use GIO's default implementation - though that one is
* unfortunately broken, see #615111. So we copy-paste a fixed-up version.
*/
async_initable_iface->init_async = async_initable_init_async;
async_initable_iface->init_finish = async_initable_init_finish;
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_connection_new:
* @stream: A #GIOStream.
* @guid: The GUID to use if a authenticating as a server or %NULL.
* @flags: Flags describing how to make the connection.
* @observer: A #GDBusAuthObserver or %NULL.
* @cancellable: A #GCancellable or %NULL.
* @callback: A #GAsyncReadyCallback to call when the request is satisfied.
* @user_data: The data to pass to @callback.
*
* Asynchronously sets up a D-Bus connection for exchanging D-Bus messages
* with the end represented by @stream.
*
* If @observer is not %NULL it may be used to control the
* authentication process.
*
* When the operation is finished, @callback will be invoked. You can
* then call g_dbus_connection_new_finish() to get the result of the
* operation.
*
* This is a asynchronous failable constructor. See
* g_dbus_connection_new_sync() for the synchronous
* version.
*
* Since: 2.26
*/
void
g_dbus_connection_new (GIOStream *stream,
const gchar *guid,
GDBusConnectionFlags flags,
GDBusAuthObserver *observer,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
g_return_if_fail (G_IS_IO_STREAM (stream));
g_async_initable_new_async (G_TYPE_DBUS_CONNECTION,
G_PRIORITY_DEFAULT,
cancellable,
callback,
user_data,
"stream", stream,
"guid", guid,
"flags", flags,
"authentication-observer", observer,
NULL);
}
/**
* g_dbus_connection_new_finish:
* @res: A #GAsyncResult obtained from the #GAsyncReadyCallback passed to g_dbus_connection_new().
* @error: Return location for error or %NULL.
*
* Finishes an operation started with g_dbus_connection_new().
*
* Returns: A #GDBusConnection or %NULL if @error is set. Free with g_object_unref().
*
* Since: 2.26
*/
GDBusConnection *
g_dbus_connection_new_finish (GAsyncResult *res,
GError **error)
{
GObject *object;
GObject *source_object;
g_return_val_if_fail (G_IS_ASYNC_RESULT (res), NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
source_object = g_async_result_get_source_object (res);
g_assert (source_object != NULL);
object = g_async_initable_new_finish (G_ASYNC_INITABLE (source_object),
res,
error);
g_object_unref (source_object);
if (object != NULL)
return G_DBUS_CONNECTION (object);
else
return NULL;
}
/**
* g_dbus_connection_new_sync:
* @stream: A #GIOStream.
* @guid: The GUID to use if a authenticating as a server or %NULL.
* @flags: Flags describing how to make the connection.
* @observer: A #GDBusAuthObserver or %NULL.
* @cancellable: A #GCancellable or %NULL.
* @error: Return location for error or %NULL.
*
* Synchronously sets up a D-Bus connection for exchanging D-Bus messages
* with the end represented by @stream.
*
* If @observer is not %NULL it may be used to control the
* authentication process.
*
* This is a synchronous failable constructor. See
* g_dbus_connection_new() for the asynchronous version.
*
* Returns: A #GDBusConnection or %NULL if @error is set. Free with g_object_unref().
*
* Since: 2.26
*/
GDBusConnection *
g_dbus_connection_new_sync (GIOStream *stream,
const gchar *guid,
GDBusConnectionFlags flags,
GDBusAuthObserver *observer,
GCancellable *cancellable,
GError **error)
{
g_return_val_if_fail (G_IS_IO_STREAM (stream), NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
return g_initable_new (G_TYPE_DBUS_CONNECTION,
cancellable,
error,
"stream", stream,
"guid", guid,
"flags", flags,
"authentication-observer", observer,
NULL);
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_connection_new_for_address:
* @address: A D-Bus address.
* @flags: Flags describing how to make the connection.
* @observer: A #GDBusAuthObserver or %NULL.
* @cancellable: A #GCancellable or %NULL.
* @callback: A #GAsyncReadyCallback to call when the request is satisfied.
* @user_data: The data to pass to @callback.
*
* Asynchronously connects and sets up a D-Bus client connection for
* exchanging D-Bus messages with an endpoint specified by @address
* which must be in the D-Bus address format.
*
* This constructor can only be used to initiate client-side
* connections - use g_dbus_connection_new() if you need to act as the
* server. In particular, @flags cannot contain the
* %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER or
* %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS flags.
*
* When the operation is finished, @callback will be invoked. You can
* then call g_dbus_connection_new_finish() to get the result of the
* operation.
*
* If @observer is not %NULL it may be used to control the
* authentication process.
*
* This is a asynchronous failable constructor. See
* g_dbus_connection_new_for_address_sync() for the synchronous
* version.
*
* Since: 2.26
*/
void
g_dbus_connection_new_for_address (const gchar *address,
GDBusConnectionFlags flags,
GDBusAuthObserver *observer,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
g_return_if_fail (address != NULL);
g_async_initable_new_async (G_TYPE_DBUS_CONNECTION,
G_PRIORITY_DEFAULT,
cancellable,
callback,
user_data,
"address", address,
"flags", flags,
"authentication-observer", observer,
NULL);
}
/**
* g_dbus_connection_new_for_address_finish:
* @res: A #GAsyncResult obtained from the #GAsyncReadyCallback passed to g_dbus_connection_new().
* @error: Return location for error or %NULL.
*
* Finishes an operation started with g_dbus_connection_new_for_address().
*
* Returns: A #GDBusConnection or %NULL if @error is set. Free with g_object_unref().
*
* Since: 2.26
*/
GDBusConnection *
g_dbus_connection_new_for_address_finish (GAsyncResult *res,
GError **error)
{
GObject *object;
GObject *source_object;
g_return_val_if_fail (G_IS_ASYNC_RESULT (res), NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
source_object = g_async_result_get_source_object (res);
g_assert (source_object != NULL);
object = g_async_initable_new_finish (G_ASYNC_INITABLE (source_object),
res,
error);
g_object_unref (source_object);
if (object != NULL)
return G_DBUS_CONNECTION (object);
else
return NULL;
}
/**
* g_dbus_connection_new_for_address_sync:
* @address: A D-Bus address.
* @flags: Flags describing how to make the connection.
* @observer: A #GDBusAuthObserver or %NULL.
* @cancellable: A #GCancellable or %NULL.
* @error: Return location for error or %NULL.
*
* Synchronously connects and sets up a D-Bus client connection for
* exchanging D-Bus messages with an endpoint specified by @address
* which must be in the D-Bus address format.
*
* This constructor can only be used to initiate client-side
* connections - use g_dbus_connection_new_sync() if you need to act
* as the server. In particular, @flags cannot contain the
* %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER or
* %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS flags.
*
* This is a synchronous failable constructor. See
* g_dbus_connection_new_for_address() for the asynchronous version.
*
* If @observer is not %NULL it may be used to control the
* authentication process.
*
* Returns: A #GDBusConnection or %NULL if @error is set. Free with g_object_unref().
*
* Since: 2.26
*/
GDBusConnection *
g_dbus_connection_new_for_address_sync (const gchar *address,
GDBusConnectionFlags flags,
GDBusAuthObserver *observer,
GCancellable *cancellable,
GError **error)
{
g_return_val_if_fail (address != NULL, NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
return g_initable_new (G_TYPE_DBUS_CONNECTION,
cancellable,
error,
"address", address,
"flags", flags,
"authentication-observer", observer,
NULL);
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_connection_set_exit_on_close:
* @connection: A #GDBusConnection.
* @exit_on_close: Whether the process should be terminated
* when @connection is closed by the remote peer.
*
* Sets whether the process should be terminated when @connection is
* closed by the remote peer. See #GDBusConnection:exit-on-close for
* more details.
*
* Since: 2.26
*/
void
g_dbus_connection_set_exit_on_close (GDBusConnection *connection,
gboolean exit_on_close)
{
g_return_if_fail (G_IS_DBUS_CONNECTION (connection));
connection->priv->exit_on_close = exit_on_close;
}
/**
* g_dbus_connection_get_exit_on_close:
* @connection: A #GDBusConnection.
*
* Gets whether the process is terminated when @connection is
* closed by the remote peer. See
* #GDBusConnection:exit-on-close for more details.
*
* Returns: Whether the process is terminated when @connection is
* closed by the remote peer.
*
* Since: 2.26
*/
gboolean
g_dbus_connection_get_exit_on_close (GDBusConnection *connection)
{
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
return connection->priv->exit_on_close;
}
/**
* g_dbus_connection_get_guid:
* @connection: A #GDBusConnection.
*
* The GUID of the peer performing the role of server when
* authenticating. See #GDBusConnection:guid for more details.
*
* Returns: The GUID. Do not free this string, it is owned by
* @connection.
*
* Since: 2.26
*/
const gchar *
g_dbus_connection_get_guid (GDBusConnection *connection)
{
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
return connection->priv->guid;
}
/**
* g_dbus_connection_get_unique_name:
* @connection: A #GDBusConnection.
*
* Gets the unique name of @connection as assigned by the message
* bus. This can also be used to figure out if @connection is a
* message bus connection.
*
* Returns: The unique name or %NULL if @connection is not a message
* bus connection. Do not free this string, it is owned by
* @connection.
*
* Since: 2.26
*/
const gchar *
g_dbus_connection_get_unique_name (GDBusConnection *connection)
{
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
return connection->priv->bus_unique_name;
}
/**
* g_dbus_connection_get_peer_credentials:
* @connection: A #GDBusConnection.
*
* Gets the credentials of the authenticated peer. This will always
* return %NULL unless @connection acted as a server
* (e.g. %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER was passed)
* when set up and the client passed credentials as part of the
* authentication process.
*
* In a message bus setup, the message bus is always the server and
* each application is a client. So this method will always return
* %NULL for message bus clients.
*
* Returns: A #GCredentials or %NULL if not available. Do not free
* this object, it is owned by @connection.
*
* Since: 2.26
*/
GCredentials *
g_dbus_connection_get_peer_credentials (GDBusConnection *connection)
{
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
return connection->priv->crendentials;
}
/* ---------------------------------------------------------------------------------------------------- */
static guint _global_filter_id = 1;
/**
* g_dbus_connection_add_filter:
* @connection: A #GDBusConnection.
* @filter_function: A filter function.
* @user_data: User data to pass to @filter_function.
* @user_data_free_func: Function to free @user_data with when filter
* is removed or %NULL.
*
* Adds a message filter. Filters are handlers that are run on all
* incoming messages, prior to standard dispatch. Filters are run in
* the order that they were added. The same handler can be added as a
* filter more than once, in which case it will be run more than once.
* Filters added during a filter callback won't be run on the message
* being processed.
*
* Note that filters are run in a dedicated message handling thread so
* they can't block and, generally, can't do anything but signal a
* worker thread. Also note that filters are rarely needed - use API
* such as g_dbus_connection_send_message_with_reply(),
* g_dbus_connection_signal_subscribe() or
* g_dbus_connection_call() instead.
*
* Returns: A filter identifier that can be used with
* g_dbus_connection_remove_filter().
*
* Since: 2.26
*/
guint
g_dbus_connection_add_filter (GDBusConnection *connection,
GDBusMessageFilterFunction filter_function,
gpointer user_data,
GDestroyNotify user_data_free_func)
{
FilterData *data;
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), 0);
g_return_val_if_fail (filter_function != NULL, 0);
CONNECTION_LOCK (connection);
data = g_new0 (FilterData, 1);
data->id = _global_filter_id++; /* TODO: overflow etc. */
data->filter_function = filter_function;
data->user_data = user_data;
data->user_data_free_func = user_data_free_func;
g_ptr_array_add (connection->priv->filters, data);
CONNECTION_UNLOCK (connection);
return data->id;
}
/* only called from finalize(), removes all filters */
static void
purge_all_filters (GDBusConnection *connection)
{
guint n;
for (n = 0; n < connection->priv->filters->len; n++)
{
FilterData *data = connection->priv->filters->pdata[n];
if (data->user_data_free_func != NULL)
data->user_data_free_func (data->user_data);
g_free (data);
}
}
/**
* g_dbus_connection_remove_filter:
* @connection: a #GDBusConnection
* @filter_id: an identifier obtained from g_dbus_connection_add_filter()
*
* Removes a filter.
*
* Since: 2.26
*/
void
g_dbus_connection_remove_filter (GDBusConnection *connection,
guint filter_id)
{
guint n;
FilterData *to_destroy;
g_return_if_fail (G_IS_DBUS_CONNECTION (connection));
CONNECTION_LOCK (connection);
to_destroy = NULL;
for (n = 0; n < connection->priv->filters->len; n++)
{
FilterData *data = connection->priv->filters->pdata[n];
if (data->id == filter_id)
{
g_ptr_array_remove_index (connection->priv->filters, n);
to_destroy = data;
break;
}
}
CONNECTION_UNLOCK (connection);
/* do free without holding lock */
if (to_destroy != NULL)
{
if (to_destroy->user_data_free_func != NULL)
to_destroy->user_data_free_func (to_destroy->user_data);
g_free (to_destroy);
}
else
{
g_warning ("g_dbus_connection_remove_filter: No filter found for filter_id %d", filter_id);
}
}
/* ---------------------------------------------------------------------------------------------------- */
typedef struct
{
gchar *rule;
gchar *sender;
gchar *interface_name;
gchar *member;
gchar *object_path;
gchar *arg0;
GArray *subscribers;
} SignalData;
typedef struct
{
GDBusSignalCallback callback;
gpointer user_data;
GDestroyNotify user_data_free_func;
guint id;
GMainContext *context;
} SignalSubscriber;
static void
signal_data_free (SignalData *data)
{
g_free (data->rule);
g_free (data->sender);
g_free (data->interface_name);
g_free (data->member);
g_free (data->object_path);
g_free (data->arg0);
g_array_free (data->subscribers, TRUE);
g_free (data);
}
static gchar *
args_to_rule (const gchar *sender,
const gchar *interface_name,
const gchar *member,
const gchar *object_path,
const gchar *arg0)
{
GString *rule;
rule = g_string_new ("type='signal'");
if (sender != NULL)
g_string_append_printf (rule, ",sender='%s'", sender);
if (interface_name != NULL)
g_string_append_printf (rule, ",interface='%s'", interface_name);
if (member != NULL)
g_string_append_printf (rule, ",member='%s'", member);
if (object_path != NULL)
g_string_append_printf (rule, ",path='%s'", object_path);
if (arg0 != NULL)
g_string_append_printf (rule, ",arg0='%s'", arg0);
return g_string_free (rule, FALSE);
}
static guint _global_subscriber_id = 1;
static guint _global_registration_id = 1;
static guint _global_subtree_registration_id = 1;
/* ---------------------------------------------------------------------------------------------------- */
/* must hold lock when calling */
static void
add_match_rule (GDBusConnection *connection,
const gchar *match_rule)
{
GError *error;
GDBusMessage *message;
message = g_dbus_message_new_method_call ("org.freedesktop.DBus", /* name */
"/org/freedesktop/DBus", /* path */
"org.freedesktop.DBus", /* interface */
"AddMatch");
g_dbus_message_set_body (message, g_variant_new ("(s)", match_rule));
error = NULL;
if (!g_dbus_connection_send_message_unlocked (connection,
message,
NULL,
&error))
{
g_critical ("Error while sending AddMatch() message: %s", error->message);
g_error_free (error);
}
g_object_unref (message);
}
/* ---------------------------------------------------------------------------------------------------- */
/* must hold lock when calling */
static void
remove_match_rule (GDBusConnection *connection,
const gchar *match_rule)
{
GError *error;
GDBusMessage *message;
message = g_dbus_message_new_method_call ("org.freedesktop.DBus", /* name */
"/org/freedesktop/DBus", /* path */
"org.freedesktop.DBus", /* interface */
"RemoveMatch");
g_dbus_message_set_body (message, g_variant_new ("(s)", match_rule));
error = NULL;
if (!g_dbus_connection_send_message_unlocked (connection,
message,
NULL,
&error))
{
g_critical ("Error while sending RemoveMatch() message: %s", error->message);
g_error_free (error);
}
g_object_unref (message);
}
/* ---------------------------------------------------------------------------------------------------- */
static gboolean
is_signal_data_for_name_lost_or_acquired (SignalData *signal_data)
{
return g_strcmp0 (signal_data->sender, "org.freedesktop.DBus") == 0 &&
g_strcmp0 (signal_data->interface_name, "org.freedesktop.DBus") == 0 &&
g_strcmp0 (signal_data->object_path, "/org/freedesktop/DBus") == 0 &&
(g_strcmp0 (signal_data->member, "NameLost") == 0 ||
g_strcmp0 (signal_data->member, "NameAcquired") == 0);
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_connection_signal_subscribe:
* @connection: A #GDBusConnection.
* @sender: Sender name to match on. Must be either <literal>org.freedesktop.DBus</literal> (for listening to signals from the message bus daemon) or a unique name or %NULL to listen from all senders.
* @interface_name: D-Bus interface name to match on or %NULL to match on all interfaces.
* @member: D-Bus signal name to match on or %NULL to match on all signals.
* @object_path: Object path to match on or %NULL to match on all object paths.
* @arg0: Contents of first string argument to match on or %NULL to match on all kinds of arguments.
* @callback: Callback to invoke when there is a signal matching the requested data.
* @user_data: User data to pass to @callback.
* @user_data_free_func: Function to free @user_data with when subscription is removed or %NULL.
*
* Subscribes to signals on @connection and invokes @callback with a
* whenever the signal is received. Note that @callback
* will be invoked in the <link
* linkend="g-main-context-push-thread-default">thread-default main
* loop</link> of the thread you are calling this method from.
*
* It is considered a programming error to use this function if @connection is closed.
*
* Note that if @sender is not <literal>org.freedesktop.DBus</literal> (for listening to signals from the
* message bus daemon), then it needs to be a unique bus name or %NULL (for listening to signals from any
* name) - you cannot pass a name like <literal>com.example.MyApp</literal>.
* Use e.g. g_bus_watch_name() to find the unique name for the owner of the name you are interested in. Also note
* that this function does not remove a subscription if @sender vanishes from the bus. You have to manually
* call g_dbus_connection_signal_unsubscribe() to remove a subscription.
*
* Returns: A subscription identifier that can be used with g_dbus_connection_signal_unsubscribe().
*
* Since: 2.26
*/
guint
g_dbus_connection_signal_subscribe (GDBusConnection *connection,
const gchar *sender,
const gchar *interface_name,
const gchar *member,
const gchar *object_path,
const gchar *arg0,
GDBusSignalCallback callback,
gpointer user_data,
GDestroyNotify user_data_free_func)
{
gchar *rule;
SignalData *signal_data;
SignalSubscriber subscriber;
GPtrArray *signal_data_array;
/* Right now we abort if AddMatch() fails since it can only fail with the bus being in
* an OOM condition. We might want to change that but that would involve making
* g_dbus_connection_signal_subscribe() asynchronous and having the call sites
* handle that. And there's really no sensible way of handling this short of retrying
* to add the match rule... and then there's the little thing that, hey, maybe there's
* a reason the bus in an OOM condition.
*
* Doable, but not really sure it's worth it...
*/
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), 0);
g_return_val_if_fail (!g_dbus_connection_is_closed (connection), 0);
g_return_val_if_fail (sender == NULL || ((strcmp (sender, "org.freedesktop.DBus") == 0 || sender[0] == ':') &&
(connection->priv->flags & G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION)), 0);
g_return_val_if_fail (interface_name == NULL || g_dbus_is_interface_name (interface_name), 0);
g_return_val_if_fail (member == NULL || g_dbus_is_member_name (member), 0);
g_return_val_if_fail (object_path == NULL || g_variant_is_object_path (object_path), 0);
g_return_val_if_fail (callback != NULL, 0);
CONNECTION_LOCK (connection);
rule = args_to_rule (sender, interface_name, member, object_path, arg0);
if (sender == NULL)
sender = "";
subscriber.callback = callback;
subscriber.user_data = user_data;
subscriber.user_data_free_func = user_data_free_func;
subscriber.id = _global_subscriber_id++; /* TODO: overflow etc. */
subscriber.context = g_main_context_get_thread_default ();
if (subscriber.context != NULL)
g_main_context_ref (subscriber.context);
/* see if we've already have this rule */
signal_data = g_hash_table_lookup (connection->priv->map_rule_to_signal_data, rule);
if (signal_data != NULL)
{
g_array_append_val (signal_data->subscribers, subscriber);
g_free (rule);
goto out;
}
signal_data = g_new0 (SignalData, 1);
signal_data->rule = rule;
signal_data->sender = g_strdup (sender);
signal_data->interface_name = g_strdup (interface_name);
signal_data->member = g_strdup (member);
signal_data->object_path = g_strdup (object_path);
signal_data->arg0 = g_strdup (arg0);
signal_data->subscribers = g_array_new (FALSE, FALSE, sizeof (SignalSubscriber));
g_array_append_val (signal_data->subscribers, subscriber);
g_hash_table_insert (connection->priv->map_rule_to_signal_data,
signal_data->rule,
signal_data);
/* Add the match rule to the bus...
*
* Avoid adding match rules for NameLost and NameAcquired messages - the bus will
* always send such messages to us.
*/
if (connection->priv->flags & G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION)
{
if (!is_signal_data_for_name_lost_or_acquired (signal_data))
add_match_rule (connection, signal_data->rule);
}
out:
g_hash_table_insert (connection->priv->map_id_to_signal_data,
GUINT_TO_POINTER (subscriber.id),
signal_data);
signal_data_array = g_hash_table_lookup (connection->priv->map_sender_to_signal_data_array,
signal_data->sender);
if (signal_data_array == NULL)
{
signal_data_array = g_ptr_array_new ();
g_hash_table_insert (connection->priv->map_sender_to_signal_data_array,
g_strdup (signal_data->sender),
signal_data_array);
}
g_ptr_array_add (signal_data_array, signal_data);
CONNECTION_UNLOCK (connection);
return subscriber.id;
}
/* ---------------------------------------------------------------------------------------------------- */
/* must hold lock when calling this */
static void
unsubscribe_id_internal (GDBusConnection *connection,
guint subscription_id,
GArray *out_removed_subscribers)
{
SignalData *signal_data;
GPtrArray *signal_data_array;
guint n;
signal_data = g_hash_table_lookup (connection->priv->map_id_to_signal_data,
GUINT_TO_POINTER (subscription_id));
if (signal_data == NULL)
{
/* Don't warn here, we may have thrown all subscriptions out when the connection was closed */
goto out;
}
for (n = 0; n < signal_data->subscribers->len; n++)
{
SignalSubscriber *subscriber;
subscriber = &(g_array_index (signal_data->subscribers, SignalSubscriber, n));
if (subscriber->id != subscription_id)
continue;
g_warn_if_fail (g_hash_table_remove (connection->priv->map_id_to_signal_data,
GUINT_TO_POINTER (subscription_id)));
g_array_append_val (out_removed_subscribers, *subscriber);
g_array_remove_index (signal_data->subscribers, n);
if (signal_data->subscribers->len == 0)
g_warn_if_fail (g_hash_table_remove (connection->priv->map_rule_to_signal_data, signal_data->rule));
signal_data_array = g_hash_table_lookup (connection->priv->map_sender_to_signal_data_array,
signal_data->sender);
g_warn_if_fail (signal_data_array != NULL);
g_warn_if_fail (g_ptr_array_remove (signal_data_array, signal_data));
if (signal_data_array->len == 0)
{
g_warn_if_fail (g_hash_table_remove (connection->priv->map_sender_to_signal_data_array, signal_data->sender));
/* remove the match rule from the bus unless NameLost or NameAcquired (see subscribe()) */
if (connection->priv->flags & G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION)
{
if (!is_signal_data_for_name_lost_or_acquired (signal_data))
remove_match_rule (connection, signal_data->rule);
}
signal_data_free (signal_data);
}
goto out;
}
g_assert_not_reached ();
out:
;
}
/**
* g_dbus_connection_signal_unsubscribe:
* @connection: A #GDBusConnection.
* @subscription_id: A subscription id obtained from g_dbus_connection_signal_subscribe().
*
* Unsubscribes from signals.
*
* Since: 2.26
*/
void
g_dbus_connection_signal_unsubscribe (GDBusConnection *connection,
guint subscription_id)
{
GArray *subscribers;
guint n;
g_return_if_fail (G_IS_DBUS_CONNECTION (connection));
subscribers = g_array_new (FALSE, FALSE, sizeof (SignalSubscriber));
CONNECTION_LOCK (connection);
unsubscribe_id_internal (connection,
subscription_id,
subscribers);
CONNECTION_UNLOCK (connection);
/* invariant */
g_assert (subscribers->len == 0 || subscribers->len == 1);
/* call GDestroyNotify without lock held */
for (n = 0; n < subscribers->len; n++)
{
SignalSubscriber *subscriber;
subscriber = &(g_array_index (subscribers, SignalSubscriber, n));
if (subscriber->user_data_free_func != NULL)
subscriber->user_data_free_func (subscriber->user_data);
if (subscriber->context != NULL)
g_main_context_unref (subscriber->context);
}
g_array_free (subscribers, TRUE);
}
/* ---------------------------------------------------------------------------------------------------- */
typedef struct
{
guint subscription_id;
GDBusSignalCallback callback;
gpointer user_data;
GDBusMessage *message;
GDBusConnection *connection;
const gchar *sender;
const gchar *path;
const gchar *interface;
const gchar *member;
} SignalInstance;
/* called on delivery thread (e.g. where g_dbus_connection_signal_subscribe() was called) with
* no locks held
*/
static gboolean
emit_signal_instance_in_idle_cb (gpointer data)
{
SignalInstance *signal_instance = data;
GVariant *parameters;
gboolean has_subscription;
parameters = g_dbus_message_get_body (signal_instance->message);
if (parameters == NULL)
{
parameters = g_variant_new ("()");
g_variant_ref_sink (parameters);
}
else
{
g_variant_ref_sink (parameters);
}
#if 0
g_debug ("in emit_signal_instance_in_idle_cb (sender=%s path=%s interface=%s member=%s params=%s)",
signal_instance->sender,
signal_instance->path,
signal_instance->interface,
signal_instance->member,
g_variant_print (parameters, TRUE));
#endif
/* Careful here, don't do the callback if we no longer has the subscription */
CONNECTION_LOCK (signal_instance->connection);
has_subscription = FALSE;
if (g_hash_table_lookup (signal_instance->connection->priv->map_id_to_signal_data,
GUINT_TO_POINTER (signal_instance->subscription_id)) != NULL)
has_subscription = TRUE;
CONNECTION_UNLOCK (signal_instance->connection);
if (has_subscription)
signal_instance->callback (signal_instance->connection,
signal_instance->sender,
signal_instance->path,
signal_instance->interface,
signal_instance->member,
parameters,
signal_instance->user_data);
if (parameters != NULL)
g_variant_unref (parameters);
return FALSE;
}
static void
signal_instance_free (SignalInstance *signal_instance)
{
g_object_unref (signal_instance->message);
g_object_unref (signal_instance->connection);
g_free (signal_instance);
}
/* called in message handler thread WITH lock held */
static void
schedule_callbacks (GDBusConnection *connection,
GPtrArray *signal_data_array,
GDBusMessage *message,
const gchar *sender)
{
guint n, m;
const gchar *interface;
const gchar *member;
const gchar *path;
const gchar *arg0;
interface = NULL;
member = NULL;
path = NULL;
arg0 = NULL;
interface = g_dbus_message_get_interface (message);
member = g_dbus_message_get_member (message);
path = g_dbus_message_get_path (message);
arg0 = g_dbus_message_get_arg0 (message);
#if 0
g_debug ("sender = `%s'", sender);
g_debug ("interface = `%s'", interface);
g_debug ("member = `%s'", member);
g_debug ("path = `%s'", path);
g_debug ("arg0 = `%s'", arg0);
#endif
/* TODO: if this is slow, then we can change signal_data_array into
* map_object_path_to_signal_data_array or something.
*/
for (n = 0; n < signal_data_array->len; n++)
{
SignalData *signal_data = signal_data_array->pdata[n];
if (signal_data->interface_name != NULL && g_strcmp0 (signal_data->interface_name, interface) != 0)
continue;
if (signal_data->member != NULL && g_strcmp0 (signal_data->member, member) != 0)
continue;
if (signal_data->object_path != NULL && g_strcmp0 (signal_data->object_path, path) != 0)
continue;
if (signal_data->arg0 != NULL && g_strcmp0 (signal_data->arg0, arg0) != 0)
continue;
for (m = 0; m < signal_data->subscribers->len; m++)
{
SignalSubscriber *subscriber;
GSource *idle_source;
SignalInstance *signal_instance;
subscriber = &(g_array_index (signal_data->subscribers, SignalSubscriber, m));
signal_instance = g_new0 (SignalInstance, 1);
signal_instance->subscription_id = subscriber->id;
signal_instance->callback = subscriber->callback;
signal_instance->user_data = subscriber->user_data;
signal_instance->message = g_object_ref (message);
signal_instance->connection = g_object_ref (connection);
signal_instance->sender = sender;
signal_instance->path = path;
signal_instance->interface = interface;
signal_instance->member = member;
idle_source = g_idle_source_new ();
g_source_set_priority (idle_source, G_PRIORITY_DEFAULT);
g_source_set_callback (idle_source,
emit_signal_instance_in_idle_cb,
signal_instance,
(GDestroyNotify) signal_instance_free);
g_source_attach (idle_source, subscriber->context);
g_source_unref (idle_source);
}
}
}
/* called in message handler thread with lock held */
static void
distribute_signals (GDBusConnection *connection,
GDBusMessage *message)
{
GPtrArray *signal_data_array;
const gchar *sender;
sender = g_dbus_message_get_sender (message);
/* collect subscribers that match on sender */
if (sender != NULL)
{
signal_data_array = g_hash_table_lookup (connection->priv->map_sender_to_signal_data_array, sender);
if (signal_data_array != NULL)
schedule_callbacks (connection, signal_data_array, message, sender);
}
/* collect subscribers not matching on sender */
signal_data_array = g_hash_table_lookup (connection->priv->map_sender_to_signal_data_array, "");
if (signal_data_array != NULL)
schedule_callbacks (connection, signal_data_array, message, sender);
}
/* ---------------------------------------------------------------------------------------------------- */
/* only called from finalize(), removes all subscriptions */
static void
purge_all_signal_subscriptions (GDBusConnection *connection)
{
GHashTableIter iter;
gpointer key;
GArray *ids;
GArray *subscribers;
guint n;
ids = g_array_new (FALSE, FALSE, sizeof (guint));
g_hash_table_iter_init (&iter, connection->priv->map_id_to_signal_data);
while (g_hash_table_iter_next (&iter, &key, NULL))
{
guint subscription_id = GPOINTER_TO_UINT (key);
g_array_append_val (ids, subscription_id);
}
subscribers = g_array_new (FALSE, FALSE, sizeof (SignalSubscriber));
for (n = 0; n < ids->len; n++)
{
guint subscription_id = g_array_index (ids, guint, n);
unsubscribe_id_internal (connection,
subscription_id,
subscribers);
}
g_array_free (ids, TRUE);
/* call GDestroyNotify without lock held */
for (n = 0; n < subscribers->len; n++)
{
SignalSubscriber *subscriber;
subscriber = &(g_array_index (subscribers, SignalSubscriber, n));
if (subscriber->user_data_free_func != NULL)
subscriber->user_data_free_func (subscriber->user_data);
if (subscriber->context != NULL)
g_main_context_unref (subscriber->context);
}
g_array_free (subscribers, TRUE);
}
/* ---------------------------------------------------------------------------------------------------- */
struct ExportedObject
{
gchar *object_path;
GDBusConnection *connection;
/* maps gchar* -> ExportedInterface* */
GHashTable *map_if_name_to_ei;
};
/* only called with lock held */
static void
exported_object_free (ExportedObject *eo)
{
g_free (eo->object_path);
g_hash_table_unref (eo->map_if_name_to_ei);
g_free (eo);
}
typedef struct
{
ExportedObject *eo;
guint id;
gchar *interface_name;
const GDBusInterfaceVTable *vtable;
const GDBusInterfaceInfo *introspection_data;
GMainContext *context;
gpointer user_data;
GDestroyNotify user_data_free_func;
} ExportedInterface;
/* called with lock held */
static void
exported_interface_free (ExportedInterface *ei)
{
if (ei->user_data_free_func != NULL)
/* TODO: push to thread-default mainloop */
ei->user_data_free_func (ei->user_data);
if (ei->context != NULL)
g_main_context_unref (ei->context);
g_free (ei->interface_name);
g_free (ei);
}
/* ---------------------------------------------------------------------------------------------------- */
typedef struct
{
GDBusConnection *connection;
GDBusMessage *message;
gpointer user_data;
const char *property_name;
const GDBusInterfaceVTable *vtable;
const GDBusInterfaceInfo *interface_info;
const GDBusPropertyInfo *property_info;
} PropertyData;
static void
property_data_free (PropertyData *data)
{
g_object_unref (data->connection);
g_object_unref (data->message);
g_free (data);
}
/* called in thread where object was registered - no locks held */
static gboolean
invoke_get_property_in_idle_cb (gpointer _data)
{
PropertyData *data = _data;
GVariant *value;
GError *error;
GDBusMessage *reply;
error = NULL;
value = data->vtable->get_property (data->connection,
g_dbus_message_get_sender (data->message),
g_dbus_message_get_path (data->message),
data->interface_info->name,
data->property_name,
&error,
data->user_data);
if (value != NULL)
{
g_assert_no_error (error);
g_variant_ref_sink (value);
reply = g_dbus_message_new_method_reply (data->message);
g_dbus_message_set_body (reply, g_variant_new ("(v)", value));
g_dbus_connection_send_message (data->connection, reply, NULL, NULL);
g_variant_unref (value);
g_object_unref (reply);
}
else
{
gchar *dbus_error_name;
g_assert (error != NULL);
dbus_error_name = g_dbus_error_encode_gerror (error);
reply = g_dbus_message_new_method_error_literal (data->message,
dbus_error_name,
error->message);
g_dbus_connection_send_message (data->connection, reply, NULL, NULL);
g_free (dbus_error_name);
g_error_free (error);
g_object_unref (reply);
}
return FALSE;
}
/* called in thread where object was registered - no locks held */
static gboolean
invoke_set_property_in_idle_cb (gpointer _data)
{
PropertyData *data = _data;
GError *error;
GDBusMessage *reply;
GVariant *value;
error = NULL;
value = NULL;
g_variant_get (g_dbus_message_get_body (data->message),
"(ssv)",
NULL,
NULL,
&value);
/* Fail with org.freedesktop.DBus.Error.InvalidArgs if the type
* of the given value is wrong
*/
if (g_strcmp0 (g_variant_get_type_string (value), data->property_info->signature) != 0)
{
reply = g_dbus_message_new_method_error (data->message,
"org.freedesktop.DBus.Error.InvalidArgs",
_("Error setting property `%s': Expected type `%s' but got `%s'"),
data->property_info->name,
data->property_info->signature,
g_variant_get_type_string (value));
goto out;
}
if (!data->vtable->set_property (data->connection,
g_dbus_message_get_sender (data->message),
g_dbus_message_get_path (data->message),
data->interface_info->name,
data->property_name,
value,
&error,
data->user_data))
{
gchar *dbus_error_name;
g_assert (error != NULL);
dbus_error_name = g_dbus_error_encode_gerror (error);
reply = g_dbus_message_new_method_error_literal (data->message,
dbus_error_name,
error->message);
g_free (dbus_error_name);
g_error_free (error);
}
else
{
reply = g_dbus_message_new_method_reply (data->message);
}
out:
g_assert (reply != NULL);
g_dbus_connection_send_message (data->connection, reply, NULL, NULL);
g_object_unref (reply);
return FALSE;
}
/* called with lock held */
static gboolean
validate_and_maybe_schedule_property_getset (GDBusConnection *connection,
GDBusMessage *message,
gboolean is_get,
const GDBusInterfaceInfo *introspection_data,
const GDBusInterfaceVTable *vtable,
GMainContext *main_context,
gpointer user_data)
{
gboolean handled;
const char *interface_name;
const char *property_name;
const GDBusPropertyInfo *property_info;
GSource *idle_source;
PropertyData *property_data;
GDBusMessage *reply;
handled = FALSE;
if (is_get)
g_variant_get (g_dbus_message_get_body (message),
"(&s&s)",
&interface_name,
&property_name);
else
g_variant_get (g_dbus_message_get_body (message),
"(&s&sv)",
&interface_name,
&property_name,
NULL);
if (is_get)
{
if (vtable == NULL || vtable->get_property == NULL)
goto out;
}
else
{
if (vtable == NULL || vtable->set_property == NULL)
goto out;
}
/* Check that the property exists - if not fail with org.freedesktop.DBus.Error.InvalidArgs
*/
property_info = NULL;
/* TODO: the cost of this is O(n) - it might be worth caching the result */
property_info = g_dbus_interface_info_lookup_property (introspection_data, property_name);
if (property_info == NULL)
{
reply = g_dbus_message_new_method_error (message,
"org.freedesktop.DBus.Error.InvalidArgs",
_("No such property `%s'"),
property_name);
g_dbus_connection_send_message_unlocked (connection, reply, NULL, NULL);
g_object_unref (reply);
handled = TRUE;
goto out;
}
if (is_get && !(property_info->flags & G_DBUS_PROPERTY_INFO_FLAGS_READABLE))
{
reply = g_dbus_message_new_method_error (message,
"org.freedesktop.DBus.Error.InvalidArgs",
_("Property `%s' is not readable"),
property_name);
g_dbus_connection_send_message_unlocked (connection, reply, NULL, NULL);
g_object_unref (reply);
handled = TRUE;
goto out;
}
else if (!is_get && !(property_info->flags & G_DBUS_PROPERTY_INFO_FLAGS_WRITABLE))
{
reply = g_dbus_message_new_method_error (message,
"org.freedesktop.DBus.Error.InvalidArgs",
_("Property `%s' is not writable"),
property_name);
g_dbus_connection_send_message_unlocked (connection, reply, NULL, NULL);
g_object_unref (reply);
handled = TRUE;
goto out;
}
/* ok, got the property info - call user code in an idle handler */
property_data = g_new0 (PropertyData, 1);
property_data->connection = g_object_ref (connection);
property_data->message = g_object_ref (message);
property_data->user_data = user_data;
property_data->property_name = property_name;
property_data->vtable = vtable;
property_data->interface_info = introspection_data;
property_data->property_info = property_info;
idle_source = g_idle_source_new ();
g_source_set_priority (idle_source, G_PRIORITY_DEFAULT);
g_source_set_callback (idle_source,
is_get ? invoke_get_property_in_idle_cb : invoke_set_property_in_idle_cb,
property_data,
(GDestroyNotify) property_data_free);
g_source_attach (idle_source, main_context);
g_source_unref (idle_source);
handled = TRUE;
out:
return handled;
}
/* called with lock held */
static gboolean
handle_getset_property (GDBusConnection *connection,
ExportedObject *eo,
GDBusMessage *message,
gboolean is_get)
{
ExportedInterface *ei;
gboolean handled;
const char *interface_name;
const char *property_name;
handled = FALSE;
if (is_get)
g_variant_get (g_dbus_message_get_body (message),
"(&s&s)",
&interface_name,
&property_name);
else
g_variant_get (g_dbus_message_get_body (message),
"(&s&sv)",
&interface_name,
&property_name,
NULL);
/* Fail with org.freedesktop.DBus.Error.InvalidArgs if there is
* no such interface registered
*/
ei = g_hash_table_lookup (eo->map_if_name_to_ei, interface_name);
if (ei == NULL)
{
GDBusMessage *reply;
reply = g_dbus_message_new_method_error (message,
"org.freedesktop.DBus.Error.InvalidArgs",
_("No such interface `%s'"),
interface_name);
g_dbus_connection_send_message_unlocked (eo->connection, reply, NULL, NULL);
g_object_unref (reply);
handled = TRUE;
goto out;
}
handled = validate_and_maybe_schedule_property_getset (eo->connection,
message,
is_get,
ei->introspection_data,
ei->vtable,
ei->context,
ei->user_data);
out:
return handled;
}
/* ---------------------------------------------------------------------------------------------------- */
typedef struct
{
GDBusConnection *connection;
GDBusMessage *message;
gpointer user_data;
const GDBusInterfaceVTable *vtable;
const GDBusInterfaceInfo *interface_info;
} PropertyGetAllData;
static void
property_get_all_data_free (PropertyData *data)
{
g_object_unref (data->connection);
g_object_unref (data->message);
g_free (data);
}
/* called in thread where object was registered - no locks held */
static gboolean
invoke_get_all_properties_in_idle_cb (gpointer _data)
{
PropertyGetAllData *data = _data;
GVariantBuilder *builder;
GVariant *packed;
GVariant *result;
GError *error;
GDBusMessage *reply;
guint n;
error = NULL;
/* TODO: Right now we never fail this call - we just omit values if
* a get_property() call is failing.
*
* We could fail the whole call if just a single get_property() call
* returns an error. We need clarification in the D-Bus spec about this.
*/
builder = g_variant_builder_new (G_VARIANT_TYPE ("a{sv}"));
for (n = 0; data->interface_info->properties != NULL && data->interface_info->properties[n] != NULL; n++)
{
const GDBusPropertyInfo *property_info = data->interface_info->properties[n];
GVariant *value;
if (!(property_info->flags & G_DBUS_PROPERTY_INFO_FLAGS_READABLE))
continue;
value = data->vtable->get_property (data->connection,
g_dbus_message_get_sender (data->message),
g_dbus_message_get_path (data->message),
data->interface_info->name,
property_info->name,
NULL,
data->user_data);
if (value == NULL)
continue;
g_variant_ref_sink (value);
g_variant_builder_add (builder,
"{sv}",
property_info->name,
value);
g_variant_unref (value);
}
result = g_variant_builder_end (builder);
builder = g_variant_builder_new (G_VARIANT_TYPE_TUPLE);
g_variant_builder_add_value (builder, result); /* steals result since result is floating */
packed = g_variant_builder_end (builder);
reply = g_dbus_message_new_method_reply (data->message);
g_dbus_message_set_body (reply, packed);
g_dbus_connection_send_message (data->connection, reply, NULL, NULL);
g_object_unref (reply);
return FALSE;
}
/* called with lock held */
static gboolean
validate_and_maybe_schedule_property_get_all (GDBusConnection *connection,
GDBusMessage *message,
const GDBusInterfaceInfo *introspection_data,
const GDBusInterfaceVTable *vtable,
GMainContext *main_context,
gpointer user_data)
{
gboolean handled;
const char *interface_name;
GSource *idle_source;
PropertyGetAllData *property_get_all_data;
handled = FALSE;
g_variant_get (g_dbus_message_get_body (message),
"(&s)",
&interface_name);
if (vtable == NULL || vtable->get_property == NULL)
goto out;
/* ok, got the property info - call user in an idle handler */
property_get_all_data = g_new0 (PropertyGetAllData, 1);
property_get_all_data->connection = g_object_ref (connection);
property_get_all_data->message = g_object_ref (message);
property_get_all_data->user_data = user_data;
property_get_all_data->vtable = vtable;
property_get_all_data->interface_info = introspection_data;
idle_source = g_idle_source_new ();
g_source_set_priority (idle_source, G_PRIORITY_DEFAULT);
g_source_set_callback (idle_source,
invoke_get_all_properties_in_idle_cb,
property_get_all_data,
(GDestroyNotify) property_get_all_data_free);
g_source_attach (idle_source, main_context);
g_source_unref (idle_source);
handled = TRUE;
out:
return handled;
}
/* called with lock held */
static gboolean
handle_get_all_properties (GDBusConnection *connection,
ExportedObject *eo,
GDBusMessage *message)
{
ExportedInterface *ei;
gboolean handled;
const char *interface_name;
handled = FALSE;
g_variant_get (g_dbus_message_get_body (message),
"(&s)",
&interface_name);
/* Fail with org.freedesktop.DBus.Error.InvalidArgs if there is
* no such interface registered
*/
ei = g_hash_table_lookup (eo->map_if_name_to_ei, interface_name);
if (ei == NULL)
{
GDBusMessage *reply;
reply = g_dbus_message_new_method_error (message,
"org.freedesktop.DBus.Error.InvalidArgs",
_("No such interface"),
interface_name);
g_dbus_connection_send_message_unlocked (eo->connection, reply, NULL, NULL);
g_object_unref (reply);
handled = TRUE;
goto out;
}
handled = validate_and_maybe_schedule_property_get_all (eo->connection,
message,
ei->introspection_data,
ei->vtable,
ei->context,
ei->user_data);
out:
return handled;
}
/* ---------------------------------------------------------------------------------------------------- */
static const gchar introspect_header[] =
"<!DOCTYPE node PUBLIC \"-//freedesktop//DTD D-BUS Object Introspection 1.0//EN\"\n"
" \"http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd\">\n"
"<!-- GDBus " PACKAGE_VERSION " -->\n"
"<node>\n";
static const gchar introspect_tail[] =
"</node>\n";
static const gchar introspect_standard_interfaces[] =
" <interface name=\"org.freedesktop.DBus.Properties\">\n"
" <method name=\"Get\">\n"
" <arg type=\"s\" name=\"interface_name\" direction=\"in\"/>\n"
" <arg type=\"s\" name=\"property_name\" direction=\"in\"/>\n"
" <arg type=\"v\" name=\"value\" direction=\"out\"/>\n"
" </method>\n"
" <method name=\"GetAll\">\n"
" <arg type=\"s\" name=\"interface_name\" direction=\"in\"/>\n"
" <arg type=\"a{sv}\" name=\"properties\" direction=\"out\"/>\n"
" </method>\n"
" <method name=\"Set\">\n"
" <arg type=\"s\" name=\"interface_name\" direction=\"in\"/>\n"
" <arg type=\"s\" name=\"property_name\" direction=\"in\"/>\n"
" <arg type=\"v\" name=\"value\" direction=\"in\"/>\n"
" </method>\n"
" <signal name=\"PropertiesChanged\">\n"
" <arg type=\"s\" name=\"interface_name\"/>\n"
" <arg type=\"a{sv}\" name=\"changed_properties\"/>\n"
" <arg type=\"as\" name=\"invalidated_properties\"/>\n"
" </signal>\n"
" </interface>\n"
" <interface name=\"org.freedesktop.DBus.Introspectable\">\n"
" <method name=\"Introspect\">\n"
" <arg type=\"s\" name=\"xml_data\" direction=\"out\"/>\n"
" </method>\n"
" </interface>\n"
" <interface name=\"org.freedesktop.DBus.Peer\">\n"
" <method name=\"Ping\"/>\n"
" <method name=\"GetMachineId\">\n"
" <arg type=\"s\" name=\"machine_uuid\" direction=\"out\"/>\n"
" </method>\n"
" </interface>\n";
static void
introspect_append_header (GString *s)
{
g_string_append (s, introspect_header);
}
static void
introspect_append_standard_interfaces (GString *s)
{
g_string_append (s, introspect_standard_interfaces);
}
static void
maybe_add_path (const gchar *path, gsize path_len, const gchar *object_path, GHashTable *set)
{
if (g_str_has_prefix (object_path, path) && strlen (object_path) >= path_len)
{
const gchar *begin;
const gchar *end;
gchar *s;
begin = object_path + path_len;
end = strchr (begin, '/');
if (end != NULL)
s = g_strndup (begin, end - begin);
else
s = g_strdup (begin);
if (g_hash_table_lookup (set, s) == NULL)
g_hash_table_insert (set, s, GUINT_TO_POINTER (1));
else
g_free (s);
}
}
/* TODO: we want a nicer public interface for this */
static gchar **
g_dbus_connection_list_registered_unlocked (GDBusConnection *connection,
const gchar *path)
{
GPtrArray *p;
gchar **ret;
GHashTableIter hash_iter;
const gchar *object_path;
gsize path_len;
GHashTable *set;
GList *keys;
GList *l;
CONNECTION_ENSURE_LOCK (connection);
path_len = strlen (path);
if (path_len > 1)
path_len++;
set = g_hash_table_new (g_str_hash, g_str_equal);
g_hash_table_iter_init (&hash_iter, connection->priv->map_object_path_to_eo);
while (g_hash_table_iter_next (&hash_iter, (gpointer) &object_path, NULL))
maybe_add_path (path, path_len, object_path, set);
g_hash_table_iter_init (&hash_iter, connection->priv->map_object_path_to_es);
while (g_hash_table_iter_next (&hash_iter, (gpointer) &object_path, NULL))
maybe_add_path (path, path_len, object_path, set);
p = g_ptr_array_new ();
keys = g_hash_table_get_keys (set);
for (l = keys; l != NULL; l = l->next)
g_ptr_array_add (p, l->data);
g_hash_table_unref (set);
g_list_free (keys);
g_ptr_array_add (p, NULL);
ret = (gchar **) g_ptr_array_free (p, FALSE);
return ret;
}
static gchar **
g_dbus_connection_list_registered (GDBusConnection *connection,
const gchar *path)
{
gchar **ret;
CONNECTION_LOCK (connection);
ret = g_dbus_connection_list_registered_unlocked (connection, path);
CONNECTION_UNLOCK (connection);
return ret;
}
/* called in message handler thread with lock held */
static gboolean
handle_introspect (GDBusConnection *connection,
ExportedObject *eo,
GDBusMessage *message)
{
guint n;
GString *s;
GDBusMessage *reply;
GHashTableIter hash_iter;
ExportedInterface *ei;
gchar **registered;
/* first the header with the standard interfaces */
s = g_string_sized_new (sizeof (introspect_header) +
sizeof (introspect_standard_interfaces) +
sizeof (introspect_tail));
introspect_append_header (s);
introspect_append_standard_interfaces (s);
/* then include the registered interfaces */
g_hash_table_iter_init (&hash_iter, eo->map_if_name_to_ei);
while (g_hash_table_iter_next (&hash_iter, NULL, (gpointer) &ei))
g_dbus_interface_info_generate_xml (ei->introspection_data, 2, s);
/* finally include nodes registered below us */
registered = g_dbus_connection_list_registered_unlocked (connection, eo->object_path);
for (n = 0; registered != NULL && registered[n] != NULL; n++)
g_string_append_printf (s, " <node name=\"%s\"/>\n", registered[n]);
g_strfreev (registered);
g_string_append (s, introspect_tail);
reply = g_dbus_message_new_method_reply (message);
g_dbus_message_set_body (reply, g_variant_new ("(s)", s->str));
g_dbus_connection_send_message_unlocked (connection, reply, NULL, NULL);
g_object_unref (reply);
g_string_free (s, TRUE);
return TRUE;
}
/* called in thread where object was registered - no locks held */
static gboolean
call_in_idle_cb (gpointer user_data)
{
GDBusMethodInvocation *invocation = G_DBUS_METHOD_INVOCATION (user_data);
GDBusInterfaceVTable *vtable;
vtable = g_object_get_data (G_OBJECT (invocation), "g-dbus-interface-vtable");
g_assert (vtable != NULL && vtable->method_call != NULL);
vtable->method_call (g_dbus_method_invocation_get_connection (invocation),
g_dbus_method_invocation_get_sender (invocation),
g_dbus_method_invocation_get_object_path (invocation),
g_dbus_method_invocation_get_interface_name (invocation),
g_dbus_method_invocation_get_method_name (invocation),
g_dbus_method_invocation_get_parameters (invocation),
g_object_ref (invocation),
g_dbus_method_invocation_get_user_data (invocation));
return FALSE;
}
/* called in message handler thread with lock held */
static gboolean
validate_and_maybe_schedule_method_call (GDBusConnection *connection,
GDBusMessage *message,
const GDBusInterfaceInfo *introspection_data,
const GDBusInterfaceVTable *vtable,
GMainContext *main_context,
gpointer user_data)
{
GDBusMethodInvocation *invocation;
const GDBusMethodInfo *method_info;
GDBusMessage *reply;
GVariant *parameters;
GSource *idle_source;
gboolean handled;
gchar *in_signature;
handled = FALSE;
/* TODO: the cost of this is O(n) - it might be worth caching the result */
method_info = g_dbus_interface_info_lookup_method (introspection_data, g_dbus_message_get_member (message));
/* if the method doesn't exist, return the org.freedesktop.DBus.Error.UnknownMethod
* error to the caller
*/
if (method_info == NULL)
{
reply = g_dbus_message_new_method_error (message,
"org.freedesktop.DBus.Error.UnknownMethod",
_("No such method `%s'"),
g_dbus_message_get_member (message));
g_dbus_connection_send_message_unlocked (connection, reply, NULL, NULL);
g_object_unref (reply);
handled = TRUE;
goto out;
}
/* Check that the incoming args are of the right type - if they are not, return
* the org.freedesktop.DBus.Error.InvalidArgs error to the caller
*
* TODO: might also be worth caching the combined signature.
*/
in_signature = _g_dbus_compute_complete_signature (method_info->in_args, FALSE);
if (g_strcmp0 (g_dbus_message_get_signature (message), in_signature) != 0)
{
reply = g_dbus_message_new_method_error (message,
"org.freedesktop.DBus.Error.InvalidArgs",
_("Signature of message, `%s', does not match expected signature `%s'"),
g_dbus_message_get_signature (message),
in_signature);
g_dbus_connection_send_message_unlocked (connection, reply, NULL, NULL);
g_object_unref (reply);
g_free (in_signature);
handled = TRUE;
goto out;
}
g_free (in_signature);
parameters = g_dbus_message_get_body (message);
if (parameters == NULL)
{
parameters = g_variant_new ("()");
g_variant_ref_sink (parameters);
}
else
{
g_variant_ref (parameters);
}
/* schedule the call in idle */
invocation = g_dbus_method_invocation_new (g_dbus_message_get_sender (message),
g_dbus_message_get_path (message),
g_dbus_message_get_interface (message),
g_dbus_message_get_member (message),
method_info,
connection,
message,
parameters,
user_data);
g_variant_unref (parameters);
g_object_set_data (G_OBJECT (invocation),
"g-dbus-interface-vtable",
(gpointer) vtable);
idle_source = g_idle_source_new ();
g_source_set_priority (idle_source, G_PRIORITY_DEFAULT);
g_source_set_callback (idle_source,
call_in_idle_cb,
invocation,
g_object_unref);
g_source_attach (idle_source, main_context);
g_source_unref (idle_source);
handled = TRUE;
out:
return handled;
}
/* ---------------------------------------------------------------------------------------------------- */
/* called in message handler thread with lock held */
static gboolean
obj_message_func (GDBusConnection *connection,
ExportedObject *eo,
GDBusMessage *message)
{
const gchar *interface_name;
const gchar *member;
const gchar *signature;
gboolean handled;
handled = FALSE;
interface_name = g_dbus_message_get_interface (message);
member = g_dbus_message_get_member (message);
signature = g_dbus_message_get_signature (message);
/* see if we have an interface for handling this call */
if (interface_name != NULL)
{
ExportedInterface *ei;
ei = g_hash_table_lookup (eo->map_if_name_to_ei, interface_name);
if (ei != NULL)
{
/* we do - invoke the handler in idle in the right thread */
/* handle no vtable or handler being present */
if (ei->vtable == NULL || ei->vtable->method_call == NULL)
goto out;
handled = validate_and_maybe_schedule_method_call (connection,
message,
ei->introspection_data,
ei->vtable,
ei->context,
ei->user_data);
goto out;
}
}
if (g_strcmp0 (interface_name, "org.freedesktop.DBus.Introspectable") == 0 &&
g_strcmp0 (member, "Introspect") == 0 &&
g_strcmp0 (signature, "") == 0)
{
handled = handle_introspect (connection, eo, message);
goto out;
}
else if (g_strcmp0 (interface_name, "org.freedesktop.DBus.Properties") == 0 &&
g_strcmp0 (member, "Get") == 0 &&
g_strcmp0 (signature, "ss") == 0)
{
handled = handle_getset_property (connection, eo, message, TRUE);
goto out;
}
else if (g_strcmp0 (interface_name, "org.freedesktop.DBus.Properties") == 0 &&
g_strcmp0 (member, "Set") == 0 &&
g_strcmp0 (signature, "ssv") == 0)
{
handled = handle_getset_property (connection, eo, message, FALSE);
goto out;
}
else if (g_strcmp0 (interface_name, "org.freedesktop.DBus.Properties") == 0 &&
g_strcmp0 (member, "GetAll") == 0 &&
g_strcmp0 (signature, "s") == 0)
{
handled = handle_get_all_properties (connection, eo, message);
goto out;
}
out:
return handled;
}
/**
* g_dbus_connection_register_object:
* @connection: A #GDBusConnection.
* @object_path: The object path to register at.
* @introspection_data: Introspection data for the interface.
* @vtable: A #GDBusInterfaceVTable to call into or %NULL.
* @user_data: Data to pass to functions in @vtable.
* @user_data_free_func: Function to call when the object path is unregistered.
* @error: Return location for error or %NULL.
*
* Registers callbacks for exported objects at @object_path with the
* D-Bus interface that is described in @introspection_data.
*
* Calls to functions in @vtable (and @user_data_free_func) will
* happen in the <link linkend="g-main-context-push-thread-default">thread-default main
* loop</link> of the thread you are calling this method from.
*
* Note that all #GVariant values passed to functions in @vtable will match
* the signature given in @introspection_data - if a remote caller passes
* incorrect values, the <literal>org.freedesktop.DBus.Error.InvalidArgs</literal>
* is returned to the remote caller.
*
* Additionally, if the remote caller attempts to invoke methods or
* access properties not mentioned in @introspection_data the
* <literal>org.freedesktop.DBus.Error.UnknownMethod</literal> resp.
* <literal>org.freedesktop.DBus.Error.InvalidArgs</literal> errors
* are returned to the caller.
*
* It is considered a programming error if the
* #GDBusInterfaceGetPropertyFunc function in @vtable returns a
* #GVariant of incorrect type.
*
* If an existing callback is already registered at @object_path and
* @interface_name, then @error is set to #G_IO_ERROR_EXISTS.
*
* GDBus automatically implements the standard D-Bus interfaces
* org.freedesktop.DBus.Properties, org.freedesktop.DBus.Introspectable
* and org.freedesktop.Peer, so you don't have to implement those for
* the objects you export. You <emphasis>can</emphasis> implement
* org.freedesktop.DBus.Properties yourself, e.g. to handle getting
* and setting of properties asynchronously.
*
* See <xref linkend="gdbus-server"/> for an example of how to use this method.
*
* Returns: 0 if @error is set, otherwise a registration id (never 0)
* that can be used with g_dbus_connection_unregister_object() .
*
* Since: 2.26
*/
guint
g_dbus_connection_register_object (GDBusConnection *connection,
const gchar *object_path,
const GDBusInterfaceInfo *introspection_data,
const GDBusInterfaceVTable *vtable,
gpointer user_data,
GDestroyNotify user_data_free_func,
GError **error)
{
ExportedObject *eo;
ExportedInterface *ei;
guint ret;
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), 0);
g_return_val_if_fail (!g_dbus_connection_is_closed (connection), 0);
g_return_val_if_fail (object_path != NULL && g_variant_is_object_path (object_path), 0);
g_return_val_if_fail (introspection_data != NULL, 0);
g_return_val_if_fail (g_dbus_is_interface_name (introspection_data->name), 0);
g_return_val_if_fail (error == NULL || *error == NULL, 0);
ret = 0;
CONNECTION_LOCK (connection);
eo = g_hash_table_lookup (connection->priv->map_object_path_to_eo, object_path);
if (eo == NULL)
{
eo = g_new0 (ExportedObject, 1);
eo->object_path = g_strdup (object_path);
eo->connection = connection;
eo->map_if_name_to_ei = g_hash_table_new_full (g_str_hash,
g_str_equal,
NULL,
(GDestroyNotify) exported_interface_free);
g_hash_table_insert (connection->priv->map_object_path_to_eo, eo->object_path, eo);
}
ei = g_hash_table_lookup (eo->map_if_name_to_ei, introspection_data->name);
if (ei != NULL)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_EXISTS,
_("An object is already exported for the interface %s at %s"),
introspection_data->name,
object_path);
goto out;
}
ei = g_new0 (ExportedInterface, 1);
ei->id = _global_registration_id++; /* TODO: overflow etc. */
ei->eo = eo;
ei->user_data = user_data;
ei->user_data_free_func = user_data_free_func;
ei->vtable = vtable;
ei->introspection_data = introspection_data;
ei->interface_name = g_strdup (introspection_data->name);
ei->context = g_main_context_get_thread_default ();
if (ei->context != NULL)
g_main_context_ref (ei->context);
g_hash_table_insert (eo->map_if_name_to_ei,
(gpointer) ei->interface_name,
ei);
g_hash_table_insert (connection->priv->map_id_to_ei,
GUINT_TO_POINTER (ei->id),
ei);
ret = ei->id;
out:
CONNECTION_UNLOCK (connection);
return ret;
}
/**
* g_dbus_connection_unregister_object:
* @connection: A #GDBusConnection.
* @registration_id: A registration id obtained from g_dbus_connection_register_object().
*
* Unregisters an object.
*
* Returns: %TRUE if the object was unregistered, %FALSE otherwise.
*
* Since: 2.26
*/
gboolean
g_dbus_connection_unregister_object (GDBusConnection *connection,
guint registration_id)
{
ExportedInterface *ei;
ExportedObject *eo;
gboolean ret;
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
ret = FALSE;
CONNECTION_LOCK (connection);
ei = g_hash_table_lookup (connection->priv->map_id_to_ei,
GUINT_TO_POINTER (registration_id));
if (ei == NULL)
goto out;
eo = ei->eo;
g_warn_if_fail (g_hash_table_remove (connection->priv->map_id_to_ei, GUINT_TO_POINTER (ei->id)));
g_warn_if_fail (g_hash_table_remove (eo->map_if_name_to_ei, ei->interface_name));
/* unregister object path if we have no more exported interfaces */
if (g_hash_table_size (eo->map_if_name_to_ei) == 0)
g_warn_if_fail (g_hash_table_remove (connection->priv->map_object_path_to_eo,
eo->object_path));
ret = TRUE;
out:
CONNECTION_UNLOCK (connection);
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_connection_emit_signal:
* @connection: A #GDBusConnection.
* @destination_bus_name: The unique bus name for the destination for the signal or %NULL to emit to all listeners.
* @object_path: Path of remote object.
* @interface_name: D-Bus interface to emit a signal on.
* @signal_name: The name of the signal to emit.
* @parameters: A #GVariant tuple with parameters for the signal or %NULL if not passing parameters.
* @error: Return location for error or %NULL.
*
* Emits a signal.
*
* If the parameters GVariant is floating, it is consumed.
*
* This can only fail if @parameters is not compatible with the D-Bus protocol.
*
* Returns: %TRUE unless @error is set.
*
* Since: 2.26
*/
gboolean
g_dbus_connection_emit_signal (GDBusConnection *connection,
const gchar *destination_bus_name,
const gchar *object_path,
const gchar *interface_name,
const gchar *signal_name,
GVariant *parameters,
GError **error)
{
GDBusMessage *message;
gboolean ret;
message = NULL;
ret = FALSE;
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
g_return_val_if_fail (destination_bus_name == NULL || g_dbus_is_name (destination_bus_name), FALSE);
g_return_val_if_fail (object_path != NULL && g_variant_is_object_path (object_path), FALSE);
g_return_val_if_fail (interface_name != NULL && g_dbus_is_interface_name (interface_name), FALSE);
g_return_val_if_fail (signal_name != NULL && g_dbus_is_member_name (signal_name), FALSE);
g_return_val_if_fail (parameters == NULL || g_variant_is_of_type (parameters, G_VARIANT_TYPE_TUPLE), FALSE);
message = g_dbus_message_new_signal (object_path,
interface_name,
signal_name);
if (destination_bus_name != NULL)
g_dbus_message_set_header (message,
G_DBUS_MESSAGE_HEADER_FIELD_DESTINATION,
g_variant_new_string (destination_bus_name));
if (parameters != NULL)
g_dbus_message_set_body (message, parameters);
ret = g_dbus_connection_send_message (connection, message, NULL, error);
g_object_unref (message);
return ret;
}
static void
add_call_flags (GDBusMessage *message,
GDBusCallFlags flags)
{
if (flags & G_DBUS_CALL_FLAGS_NO_AUTO_START)
g_dbus_message_set_flags (message, G_DBUS_MESSAGE_FLAGS_NO_AUTO_START);
}
/**
* g_dbus_connection_call:
* @connection: A #GDBusConnection.
* @bus_name: A unique or well-known bus name or %NULL if @connection is not a message bus connection.
* @object_path: Path of remote object.
* @interface_name: D-Bus interface to invoke method on.
* @method_name: The name of the method to invoke.
* @parameters: A #GVariant tuple with parameters for the method or %NULL if not passing parameters.
* @flags: Flags from the #GDBusCallFlags enumeration.
* @timeout_msec: The timeout in milliseconds or -1 to use the default timeout.
* @cancellable: A #GCancellable or %NULL.
* @callback: A #GAsyncReadyCallback to call when the request is satisfied or %NULL if you don't
* care about the result of the method invocation.
* @user_data: The data to pass to @callback.
*
* Asynchronously invokes the @method_name method on the
* @interface_name D-Bus interface on the remote object at
* @object_path owned by @bus_name.
*
* If @connection is closed then the operation will fail with
* %G_IO_ERROR_CLOSED. If @cancellable is canceled, the operation will
* fail with %G_IO_ERROR_CANCELLED. If @parameters contains a value
* not compatible with the D-Bus protocol, the operation fails with
* %G_IO_ERROR_INVALID_ARGUMENT.
*
* If the @parameters #GVariant is floating, it is consumed. This allows
* convenient 'inline' use of g_variant_new(), e.g.:
* |[
* g_dbus_connection_call (connection,
* "org.freedesktop.StringThings",
* "/org/freedesktop/StringThings",
* "org.freedesktop.StringThings",
* "TwoStrings",
* g_variant_new ("(ss)",
* "Thing One",
* "Thing Two"),
* G_DBUS_CALL_FLAGS_NONE,
* -1,
* NULL,
* (GAsyncReadyCallback) two_strings_done,
* NULL);
* ]|
*
* This is an asynchronous method. When the operation is finished, @callback will be invoked
* in the <link linkend="g-main-context-push-thread-default">thread-default main loop</link>
* of the thread you are calling this method from. You can then call
* g_dbus_connection_call_finish() to get the result of the operation.
* See g_dbus_connection_call_sync() for the synchronous version of this
* function.
*
* Since: 2.26
*/
void
g_dbus_connection_call (GDBusConnection *connection,
const gchar *bus_name,
const gchar *object_path,
const gchar *interface_name,
const gchar *method_name,
GVariant *parameters,
GDBusCallFlags flags,
gint timeout_msec,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GDBusMessage *message;
g_return_if_fail (G_IS_DBUS_CONNECTION (connection));
g_return_if_fail (bus_name == NULL || g_dbus_is_name (bus_name));
g_return_if_fail (object_path != NULL && g_variant_is_object_path (object_path));
g_return_if_fail (interface_name != NULL && g_dbus_is_interface_name (interface_name));
g_return_if_fail (method_name != NULL && g_dbus_is_member_name (method_name));
g_return_if_fail (timeout_msec >= 0 || timeout_msec == -1);
g_return_if_fail ((parameters == NULL) || g_variant_is_of_type (parameters, G_VARIANT_TYPE_TUPLE));
message = g_dbus_message_new_method_call (bus_name,
object_path,
interface_name,
method_name);
add_call_flags (message, flags);
if (parameters != NULL)
g_dbus_message_set_body (message, parameters);
g_dbus_connection_send_message_with_reply (connection,
message,
timeout_msec,
NULL, /* volatile guint32 *out_serial */
cancellable,
callback,
user_data);
if (message != NULL)
g_object_unref (message);
}
static GVariant *
decode_method_reply (GDBusMessage *reply,
GError **error)
{
GVariant *result;
result = NULL;
switch (g_dbus_message_get_message_type (reply))
{
case G_DBUS_MESSAGE_TYPE_METHOD_RETURN:
result = g_dbus_message_get_body (reply);
if (result == NULL)
{
result = g_variant_new ("()");
g_variant_ref_sink (result);
}
else
{
g_variant_ref (result);
}
break;
case G_DBUS_MESSAGE_TYPE_ERROR:
g_dbus_message_to_gerror (reply, error);
break;
default:
g_assert_not_reached ();
break;
}
return result;
}
/**
* g_dbus_connection_call_finish:
* @connection: A #GDBusConnection.
* @res: A #GAsyncResult obtained from the #GAsyncReadyCallback passed to g_dbus_connection_call().
* @error: Return location for error or %NULL.
*
* Finishes an operation started with g_dbus_connection_call().
*
* Returns: %NULL if @error is set. Otherwise a #GVariant tuple with
* return values. Free with g_variant_unref().
*
* Since: 2.26
*/
GVariant *
g_dbus_connection_call_finish (GDBusConnection *connection,
GAsyncResult *res,
GError **error)
{
GDBusMessage *reply;
GVariant *result;
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
g_return_val_if_fail (G_IS_ASYNC_RESULT (res), NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
result = NULL;
reply = g_dbus_connection_send_message_with_reply_finish (connection, res, error);
if (reply == NULL)
goto out;
result = decode_method_reply (reply, error);
g_object_unref (reply);
out:
return result;
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_connection_call_sync:
* @connection: A #GDBusConnection.
* @bus_name: A unique or well-known bus name.
* @object_path: Path of remote object.
* @interface_name: D-Bus interface to invoke method on.
* @method_name: The name of the method to invoke.
* @parameters: A #GVariant tuple with parameters for the method or %NULL if not passing parameters.
* @flags: Flags from the #GDBusCallFlags enumeration.
* @timeout_msec: The timeout in milliseconds or -1 to use the default timeout.
* @cancellable: A #GCancellable or %NULL.
* @error: Return location for error or %NULL.
*
* Synchronously invokes the @method_name method on the
* @interface_name D-Bus interface on the remote object at
* @object_path owned by @bus_name.
*
* If @connection is closed then the operation will fail with
* %G_IO_ERROR_CLOSED. If @cancellable is canceled, the
* operation will fail with %G_IO_ERROR_CANCELLED. If @parameters
* contains a value not compatible with the D-Bus protocol, the operation
* fails with %G_IO_ERROR_INVALID_ARGUMENT.
*
* If the @parameters #GVariant is floating, it is consumed.
* This allows convenient 'inline' use of g_variant_new(), e.g.:
* |[
* g_dbus_connection_call_sync (connection,
* "org.freedesktop.StringThings",
* "/org/freedesktop/StringThings",
* "org.freedesktop.StringThings",
* "TwoStrings",
* g_variant_new ("(ss)",
* "Thing One",
* "Thing Two"),
* G_DBUS_CALL_FLAGS_NONE,
* -1,
* NULL,
* &amp;error);
* ]|
*
* The calling thread is blocked until a reply is received. See
* g_dbus_connection_call() for the asynchronous version of
* this method.
*
* Returns: %NULL if @error is set. Otherwise a #GVariant tuple with
* return values. Free with g_variant_unref().
*
* Since: 2.26
*/
GVariant *
g_dbus_connection_call_sync (GDBusConnection *connection,
const gchar *bus_name,
const gchar *object_path,
const gchar *interface_name,
const gchar *method_name,
GVariant *parameters,
GDBusCallFlags flags,
gint timeout_msec,
GCancellable *cancellable,
GError **error)
{
GDBusMessage *message;
GDBusMessage *reply;
GVariant *result;
message = NULL;
reply = NULL;
result = NULL;
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
g_return_val_if_fail (bus_name == NULL || g_dbus_is_name (bus_name), NULL);
g_return_val_if_fail (object_path != NULL && g_variant_is_object_path (object_path), NULL);
g_return_val_if_fail (interface_name != NULL && g_dbus_is_interface_name (interface_name), NULL);
g_return_val_if_fail (method_name != NULL && g_dbus_is_member_name (method_name), NULL);
g_return_val_if_fail (timeout_msec >= 0 || timeout_msec == -1, NULL);
g_return_val_if_fail ((parameters == NULL) || g_variant_is_of_type (parameters, G_VARIANT_TYPE_TUPLE), NULL);
message = g_dbus_message_new_method_call (bus_name,
object_path,
interface_name,
method_name);
add_call_flags (message, flags);
if (parameters != NULL)
g_dbus_message_set_body (message, parameters);
reply = g_dbus_connection_send_message_with_reply_sync (connection,
message,
timeout_msec,
NULL, /* volatile guint32 *out_serial */
cancellable,
error);
if (reply == NULL)
goto out;
result = decode_method_reply (reply, error);
out:
if (message != NULL)
g_object_unref (message);
if (reply != NULL)
g_object_unref (reply);
return result;
}
/* ---------------------------------------------------------------------------------------------------- */
struct ExportedSubtree
{
guint id;
gchar *object_path;
GDBusConnection *connection;
const GDBusSubtreeVTable *vtable;
GDBusSubtreeFlags flags;
GMainContext *context;
gpointer user_data;
GDestroyNotify user_data_free_func;
};
static void
exported_subtree_free (ExportedSubtree *es)
{
if (es->user_data_free_func != NULL)
/* TODO: push to thread-default mainloop */
es->user_data_free_func (es->user_data);
if (es->context != NULL)
g_main_context_unref (es->context);
g_free (es->object_path);
g_free (es);
}
/* called without lock held */
static gboolean
handle_subtree_introspect (GDBusConnection *connection,
ExportedSubtree *es,
GDBusMessage *message)
{
GString *s;
gboolean handled;
GDBusMessage *reply;
gchar **children;
gboolean is_root;
const gchar *sender;
const gchar *requested_object_path;
const gchar *requested_node;
GPtrArray *interfaces;
guint n;
gchar **subnode_paths;
handled = FALSE;
requested_object_path = g_dbus_message_get_path (message);
sender = g_dbus_message_get_sender (message);
is_root = (g_strcmp0 (requested_object_path, es->object_path) == 0);
s = g_string_new (NULL);
introspect_append_header (s);
/* Strictly we don't need the children in dynamic mode, but we avoid the
* conditionals to preserve code clarity
*/
children = es->vtable->enumerate (es->connection,
sender,
es->object_path,
es->user_data);
if (!is_root)
{
requested_node = strrchr (requested_object_path, '/') + 1;
/* Assert existence of object if we are not dynamic */
if (!(es->flags & G_DBUS_SUBTREE_FLAGS_DISPATCH_TO_UNENUMERATED_NODES) &&
!_g_strv_has_string ((const gchar * const *) children, requested_node))
goto out;
}
else
{
requested_node = "/";
}
interfaces = es->vtable->introspect (es->connection,
sender,
es->object_path,
requested_node,
es->user_data);
if (interfaces != NULL)
{
if (interfaces->len > 0)
{
/* we're in business */
introspect_append_standard_interfaces (s);
for (n = 0; n < interfaces->len; n++)
{
const GDBusInterfaceInfo *interface_info = interfaces->pdata[n];
g_dbus_interface_info_generate_xml (interface_info, 2, s);
}
}
g_ptr_array_unref (interfaces);
}
/* then include <node> entries from the Subtree for the root */
if (is_root)
{
for (n = 0; children != NULL && children[n] != NULL; n++)
g_string_append_printf (s, " <node name=\"%s\"/>\n", children[n]);
}
/* finally include nodes registered below us */
subnode_paths = g_dbus_connection_list_registered (es->connection, requested_object_path);
for (n = 0; subnode_paths != NULL && subnode_paths[n] != NULL; n++)
g_string_append_printf (s, " <node name=\"%s\"/>\n", subnode_paths[n]);
g_strfreev (subnode_paths);
g_string_append (s, "</node>\n");
reply = g_dbus_message_new_method_reply (message);
g_dbus_message_set_body (reply, g_variant_new ("(s)", s->str));
g_dbus_connection_send_message (connection, reply, NULL, NULL);
g_object_unref (reply);
handled = TRUE;
out:
g_string_free (s, TRUE);
g_strfreev (children);
return handled;
}
/* called without lock held */
static gboolean
handle_subtree_method_invocation (GDBusConnection *connection,
ExportedSubtree *es,
GDBusMessage *message)
{
gboolean handled;;
const gchar *sender;
const gchar *interface_name;
const gchar *member;
const gchar *signature;
const gchar *requested_object_path;
const gchar *requested_node;
gboolean is_root;
gchar **children;
const GDBusInterfaceInfo *introspection_data;
const GDBusInterfaceVTable *interface_vtable;
gpointer interface_user_data;
guint n;
GPtrArray *interfaces;
gboolean is_property_get;
gboolean is_property_set;
gboolean is_property_get_all;
handled = FALSE;
interfaces = NULL;
requested_object_path = g_dbus_message_get_path (message);
sender = g_dbus_message_get_sender (message);
interface_name = g_dbus_message_get_interface (message);
member = g_dbus_message_get_member (message);
signature = g_dbus_message_get_signature (message);
is_root = (g_strcmp0 (requested_object_path, es->object_path) == 0);
is_property_get = FALSE;
is_property_set = FALSE;
is_property_get_all = FALSE;
if (g_strcmp0 (interface_name, "org.freedesktop.DBus.Properties") == 0)
{
if (g_strcmp0 (member, "Get") == 0 && g_strcmp0 (signature, "ss") == 0)
is_property_get = TRUE;
else if (g_strcmp0 (member, "Set") == 0 && g_strcmp0 (signature, "ssv") == 0)
is_property_set = TRUE;
else if (g_strcmp0 (member, "GetAll") == 0 && g_strcmp0 (signature, "s") == 0)
is_property_get_all = TRUE;
}
children = es->vtable->enumerate (es->connection,
sender,
es->object_path,
es->user_data);
if (!is_root)
{
requested_node = strrchr (requested_object_path, '/') + 1;
/* If not dynamic, skip if requested node is not part of children */
if (!(es->flags & G_DBUS_SUBTREE_FLAGS_DISPATCH_TO_UNENUMERATED_NODES) &&
!_g_strv_has_string ((const gchar * const *) children, requested_node))
goto out;
}
else
{
requested_node = "/";
}
/* get introspection data for the node */
interfaces = es->vtable->introspect (es->connection,
sender,
requested_object_path,
requested_node,
es->user_data);
g_assert (interfaces != NULL);
introspection_data = NULL;
for (n = 0; n < interfaces->len; n++)
{
const GDBusInterfaceInfo *id_n = (const GDBusInterfaceInfo *) interfaces->pdata[n];
if (g_strcmp0 (id_n->name, interface_name) == 0)
introspection_data = id_n;
}
/* dispatch the call if the user wants to handle it */
if (introspection_data != NULL)
{
/* figure out where to dispatch the method call */
interface_user_data = NULL;
interface_vtable = es->vtable->dispatch (es->connection,
sender,
es->object_path,
interface_name,
requested_node,
&interface_user_data,
es->user_data);
if (interface_vtable == NULL)
goto out;
CONNECTION_LOCK (connection);
handled = validate_and_maybe_schedule_method_call (es->connection,
message,
introspection_data,
interface_vtable,
es->context,
interface_user_data);
CONNECTION_UNLOCK (connection);
}
/* handle org.freedesktop.DBus.Properties interface if not explicitly handled */
else if (is_property_get || is_property_set || is_property_get_all)
{
if (is_property_get)
g_variant_get (g_dbus_message_get_body (message), "(&s&s)", &interface_name, NULL);
else if (is_property_set)
g_variant_get (g_dbus_message_get_body (message), "(&s&sv)", &interface_name, NULL, NULL);
else if (is_property_get_all)
g_variant_get (g_dbus_message_get_body (message), "(&s)", &interface_name, NULL, NULL);
else
g_assert_not_reached ();
/* see if the object supports this interface at all */
for (n = 0; n < interfaces->len; n++)
{
const GDBusInterfaceInfo *id_n = (const GDBusInterfaceInfo *) interfaces->pdata[n];
if (g_strcmp0 (id_n->name, interface_name) == 0)
introspection_data = id_n;
}
/* Fail with org.freedesktop.DBus.Error.InvalidArgs if the user-code
* claims it won't support the interface
*/
if (introspection_data == NULL)
{
GDBusMessage *reply;
reply = g_dbus_message_new_method_error (message,
"org.freedesktop.DBus.Error.InvalidArgs",
_("No such interface `%s'"),
interface_name);
g_dbus_connection_send_message (es->connection, reply, NULL, NULL);
g_object_unref (reply);
handled = TRUE;
goto out;
}
/* figure out where to dispatch the property get/set/getall calls */
interface_user_data = NULL;
interface_vtable = es->vtable->dispatch (es->connection,
sender,
es->object_path,
interface_name,
requested_node,
&interface_user_data,
es->user_data);
if (interface_vtable == NULL)
goto out;
if (is_property_get || is_property_set)
{
CONNECTION_LOCK (connection);
handled = validate_and_maybe_schedule_property_getset (es->connection,
message,
is_property_get,
introspection_data,
interface_vtable,
es->context,
interface_user_data);
CONNECTION_UNLOCK (connection);
}
else if (is_property_get_all)
{
CONNECTION_LOCK (connection);
handled = validate_and_maybe_schedule_property_get_all (es->connection,
message,
introspection_data,
interface_vtable,
es->context,
interface_user_data);
CONNECTION_UNLOCK (connection);
}
}
out:
if (interfaces != NULL)
g_ptr_array_unref (interfaces);
g_strfreev (children);
return handled;
}
typedef struct
{
GDBusMessage *message;
ExportedSubtree *es;
} SubtreeDeferredData;
static void
subtree_deferred_data_free (SubtreeDeferredData *data)
{
g_object_unref (data->message);
g_free (data);
}
/* called without lock held in the thread where the caller registered the subtree */
static gboolean
process_subtree_vtable_message_in_idle_cb (gpointer _data)
{
SubtreeDeferredData *data = _data;
gboolean handled;
handled = FALSE;
if (g_strcmp0 (g_dbus_message_get_interface (data->message), "org.freedesktop.DBus.Introspectable") == 0 &&
g_strcmp0 (g_dbus_message_get_member (data->message), "Introspect") == 0 &&
g_strcmp0 (g_dbus_message_get_signature (data->message), "") == 0)
handled = handle_subtree_introspect (data->es->connection,
data->es,
data->message);
else
handled = handle_subtree_method_invocation (data->es->connection,
data->es,
data->message);
if (!handled)
{
CONNECTION_LOCK (data->es->connection);
handled = handle_generic_unlocked (data->es->connection, data->message);
CONNECTION_UNLOCK (data->es->connection);
}
/* if we couldn't handle the request, just bail with the UnknownMethod error */
if (!handled)
{
GDBusMessage *reply;
reply = g_dbus_message_new_method_error (data->message,
"org.freedesktop.DBus.Error.UnknownMethod",
_("Method `%s' on interface `%s' with signature `%s' does not exist"),
g_dbus_message_get_member (data->message),
g_dbus_message_get_interface (data->message),
g_dbus_message_get_signature (data->message));
g_dbus_connection_send_message (data->es->connection, reply, NULL, NULL);
g_object_unref (reply);
}
return FALSE;
}
/* called in message handler thread with lock held */
static gboolean
subtree_message_func (GDBusConnection *connection,
ExportedSubtree *es,
GDBusMessage *message)
{
GSource *idle_source;
SubtreeDeferredData *data;
data = g_new0 (SubtreeDeferredData, 1);
data->message = g_object_ref (message);
data->es = es;
/* defer this call to an idle handler in the right thread */
idle_source = g_idle_source_new ();
g_source_set_priority (idle_source, G_PRIORITY_HIGH);
g_source_set_callback (idle_source,
process_subtree_vtable_message_in_idle_cb,
data,
(GDestroyNotify) subtree_deferred_data_free);
g_source_attach (idle_source, es->context);
g_source_unref (idle_source);
/* since we own the entire subtree, handlers for objects not in the subtree have been
* tried already by libdbus-1 - so we just need to ensure that we're always going
* to reply to the message
*/
return TRUE;
}
/**
* g_dbus_connection_register_subtree:
* @connection: A #GDBusConnection.
* @object_path: The object path to register the subtree at.
* @vtable: A #GDBusSubtreeVTable to enumerate, introspect and dispatch nodes in the subtree.
* @flags: Flags used to fine tune the behavior of the subtree.
* @user_data: Data to pass to functions in @vtable.
* @user_data_free_func: Function to call when the subtree is unregistered.
* @error: Return location for error or %NULL.
*
* Registers a whole subtree of <quote>dynamic</quote> objects.
*
* The @enumerate and @introspection functions in @vtable are used to
* convey, to remote callers, what nodes exist in the subtree rooted
* by @object_path.
*
* When handling remote calls into any node in the subtree, first the
* @enumerate function is used to check if the node exists. If the node exists
* or the #G_DBUS_SUBTREE_FLAGS_DISPATCH_TO_UNENUMERATED_NODES flag is set
* the @introspection function is used to check if the node supports the
* requested method. If so, the @dispatch function is used to determine
* where to dispatch the call. The collected #GDBusInterfaceVTable and
* #gpointer will be used to call into the interface vtable for processing
* the request.
*
* All calls into user-provided code will be invoked in the <link
* linkend="g-main-context-push-thread-default">thread-default main
* loop</link> of the thread you are calling this method from.
*
* If an existing subtree is already registered at @object_path or
* then @error is set to #G_IO_ERROR_EXISTS.
*
* Note that it is valid to register regular objects (using
* g_dbus_connection_register_object()) in a subtree registered with
* g_dbus_connection_register_subtree() - if so, the subtree handler
* is tried as the last resort. One way to think about a subtree
* handler is to consider it a <quote>fallback handler</quote>
* for object paths not registered via g_dbus_connection_register_object()
* or other bindings.
*
* See <xref linkend="gdbus-subtree-server"/> for an example of how to use this method.
*
* Returns: 0 if @error is set, otherwise a subtree registration id (never 0)
* that can be used with g_dbus_connection_unregister_subtree() .
*
* Since: 2.26
*/
guint
g_dbus_connection_register_subtree (GDBusConnection *connection,
const gchar *object_path,
const GDBusSubtreeVTable *vtable,
GDBusSubtreeFlags flags,
gpointer user_data,
GDestroyNotify user_data_free_func,
GError **error)
{
guint ret;
ExportedSubtree *es;
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), 0);
g_return_val_if_fail (object_path != NULL && g_variant_is_object_path (object_path), 0);
g_return_val_if_fail (vtable != NULL, 0);
g_return_val_if_fail (error == NULL || *error == NULL, 0);
ret = 0;
CONNECTION_LOCK (connection);
es = g_hash_table_lookup (connection->priv->map_object_path_to_es, object_path);
if (es != NULL)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_EXISTS,
_("A subtree is already exported for %s"),
object_path);
goto out;
}
es = g_new0 (ExportedSubtree, 1);
es->object_path = g_strdup (object_path);
es->connection = connection;
es->vtable = vtable;
es->flags = flags;
es->id = _global_subtree_registration_id++; /* TODO: overflow etc. */
es->user_data = user_data;
es->user_data_free_func = user_data_free_func;
es->context = g_main_context_get_thread_default ();
if (es->context != NULL)
g_main_context_ref (es->context);
g_hash_table_insert (connection->priv->map_object_path_to_es, es->object_path, es);
g_hash_table_insert (connection->priv->map_id_to_es,
GUINT_TO_POINTER (es->id),
es);
ret = es->id;
out:
CONNECTION_UNLOCK (connection);
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_connection_unregister_subtree:
* @connection: A #GDBusConnection.
* @registration_id: A subtree registration id obtained from g_dbus_connection_register_subtree().
*
* Unregisters a subtree.
*
* Returns: %TRUE if the subtree was unregistered, %FALSE otherwise.
*
* Since: 2.26
*/
gboolean
g_dbus_connection_unregister_subtree (GDBusConnection *connection,
guint registration_id)
{
ExportedSubtree *es;
gboolean ret;
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
ret = FALSE;
CONNECTION_LOCK (connection);
es = g_hash_table_lookup (connection->priv->map_id_to_es,
GUINT_TO_POINTER (registration_id));
if (es == NULL)
goto out;
g_warn_if_fail (g_hash_table_remove (connection->priv->map_id_to_es, GUINT_TO_POINTER (es->id)));
g_warn_if_fail (g_hash_table_remove (connection->priv->map_object_path_to_es, es->object_path));
ret = TRUE;
out:
CONNECTION_UNLOCK (connection);
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
/* must be called with lock held */
static void
handle_generic_ping_unlocked (GDBusConnection *connection,
const gchar *object_path,
GDBusMessage *message)
{
GDBusMessage *reply;
reply = g_dbus_message_new_method_reply (message);
g_dbus_connection_send_message_unlocked (connection, reply, NULL, NULL);
g_object_unref (reply);
}
/* must be called with lock held */
static void
handle_generic_get_machine_id_unlocked (GDBusConnection *connection,
const gchar *object_path,
GDBusMessage *message)
{
GDBusMessage *reply;
reply = NULL;
if (connection->priv->machine_id == NULL)
{
GError *error;
error = NULL;
/* TODO: use PACKAGE_LOCALSTATEDIR ? */
if (!g_file_get_contents ("/var/lib/dbus/machine-id",
&connection->priv->machine_id,
NULL,
&error))
{
reply = g_dbus_message_new_method_error (message,
"org.freedesktop.DBus.Error.Failed",
_("Unable to load /var/lib/dbus/machine-id: %s"),
error->message);
g_error_free (error);
}
else
{
g_strstrip (connection->priv->machine_id);
/* TODO: validate value */
}
}
if (reply == NULL)
{
reply = g_dbus_message_new_method_reply (message);
g_dbus_message_set_body (reply, g_variant_new ("(s)", connection->priv->machine_id));
}
g_dbus_connection_send_message_unlocked (connection, reply, NULL, NULL);
g_object_unref (reply);
}
/* must be called with lock held */
static void
handle_generic_introspect_unlocked (GDBusConnection *connection,
const gchar *object_path,
GDBusMessage *message)
{
guint n;
GString *s;
gchar **registered;
GDBusMessage *reply;
/* first the header */
s = g_string_new (NULL);
introspect_append_header (s);
registered = g_dbus_connection_list_registered_unlocked (connection, object_path);
for (n = 0; registered != NULL && registered[n] != NULL; n++)
g_string_append_printf (s, " <node name=\"%s\"/>\n", registered[n]);
g_strfreev (registered);
g_string_append (s, "</node>\n");
reply = g_dbus_message_new_method_reply (message);
g_dbus_message_set_body (reply, g_variant_new ("(s)", s->str));
g_dbus_connection_send_message_unlocked (connection, reply, NULL, NULL);
g_object_unref (reply);
g_string_free (s, TRUE);
}
/* must be called with lock held */
static gboolean
handle_generic_unlocked (GDBusConnection *connection,
GDBusMessage *message)
{
gboolean handled;
const gchar *interface_name;
const gchar *member;
const gchar *signature;
const gchar *path;
CONNECTION_ENSURE_LOCK (connection);
handled = FALSE;
interface_name = g_dbus_message_get_interface (message);
member = g_dbus_message_get_member (message);
signature = g_dbus_message_get_signature (message);
path = g_dbus_message_get_path (message);
if (g_strcmp0 (interface_name, "org.freedesktop.DBus.Introspectable") == 0 &&
g_strcmp0 (member, "Introspect") == 0 &&
g_strcmp0 (signature, "") == 0)
{
handle_generic_introspect_unlocked (connection, path, message);
handled = TRUE;
}
else if (g_strcmp0 (interface_name, "org.freedesktop.DBus.Peer") == 0 &&
g_strcmp0 (member, "Ping") == 0 &&
g_strcmp0 (signature, "") == 0)
{
handle_generic_ping_unlocked (connection, path, message);
handled = TRUE;
}
else if (g_strcmp0 (interface_name, "org.freedesktop.DBus.Peer") == 0 &&
g_strcmp0 (member, "GetMachineId") == 0 &&
g_strcmp0 (signature, "") == 0)
{
handle_generic_get_machine_id_unlocked (connection, path, message);
handled = TRUE;
}
return handled;
}
/* ---------------------------------------------------------------------------------------------------- */
/* called in message handler thread with lock held */
static void
distribute_method_call (GDBusConnection *connection,
GDBusMessage *message)
{
ExportedObject *eo;
ExportedSubtree *es;
const gchar *object_path;
const gchar *interface_name;
const gchar *member;
const gchar *signature;
const gchar *path;
gchar *subtree_path;
gchar *needle;
g_assert (g_dbus_message_get_message_type (message) == G_DBUS_MESSAGE_TYPE_METHOD_CALL);
interface_name = g_dbus_message_get_interface (message);
member = g_dbus_message_get_member (message);
signature = g_dbus_message_get_signature (message);
path = g_dbus_message_get_path (message);
subtree_path = g_strdup (path);
needle = strrchr (subtree_path, '/');
if (needle != NULL && needle != subtree_path)
{
*needle = '\0';
}
else
{
g_free (subtree_path);
subtree_path = NULL;
}
#if 0
g_debug ("interface = `%s'", interface_name);
g_debug ("member = `%s'", member);
g_debug ("signature = `%s'", signature);
g_debug ("path = `%s'", path);
g_debug ("subtree_path = `%s'", subtree_path != NULL ? subtree_path : "N/A");
#endif
object_path = g_dbus_message_get_path (message);
g_assert (object_path != NULL);
eo = g_hash_table_lookup (connection->priv->map_object_path_to_eo, object_path);
if (eo != NULL)
{
if (obj_message_func (connection, eo, message))
goto out;
}
es = g_hash_table_lookup (connection->priv->map_object_path_to_es, object_path);
if (es != NULL)
{
if (subtree_message_func (connection, es, message))
goto out;
}
if (subtree_path != NULL)
{
es = g_hash_table_lookup (connection->priv->map_object_path_to_es, subtree_path);
if (es != NULL)
{
if (subtree_message_func (connection, es, message))
goto out;
}
}
if (handle_generic_unlocked (connection, message))
goto out;
/* if we end up here, the message has not been not handled */
out:
g_free (subtree_path);
}
/* ---------------------------------------------------------------------------------------------------- */
static GDBusConnection **
message_bus_get_singleton (GBusType bus_type,
GError **error)
{
GDBusConnection **ret;
const gchar *starter_bus;
ret = NULL;
switch (bus_type)
{
case G_BUS_TYPE_SESSION:
ret = &the_session_bus;
break;
case G_BUS_TYPE_SYSTEM:
ret = &the_system_bus;
break;
case G_BUS_TYPE_STARTER:
starter_bus = g_getenv ("DBUS_STARTER_BUS_TYPE");
if (g_strcmp0 (starter_bus, "session") == 0)
{
ret = message_bus_get_singleton (G_BUS_TYPE_SESSION, error);
goto out;
}
else if (g_strcmp0 (starter_bus, "system") == 0)
{
ret = message_bus_get_singleton (G_BUS_TYPE_SYSTEM, error);
goto out;
}
else
{
if (starter_bus != NULL)
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Cannot determine bus address from DBUS_STARTER_BUS_TYPE environment variable"
" - unknown value `%s'"),
starter_bus);
}
else
{
g_set_error_literal (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Cannot determine bus address because the DBUS_STARTER_BUS_TYPE environment "
"variable is not set"));
}
}
break;
default:
g_assert_not_reached ();
break;
}
out:
return ret;
}
static GDBusConnection *
get_uninitialized_connection (GBusType bus_type,
GCancellable *cancellable,
GError **error)
{
GDBusConnection **singleton;
GDBusConnection *ret;
ret = NULL;
G_LOCK (message_bus_lock);
singleton = message_bus_get_singleton (bus_type, error);
if (singleton == NULL)
goto out;
if (*singleton == NULL)
{
gchar *address;
address = g_dbus_address_get_for_bus_sync (bus_type, cancellable, error);
if (address == NULL)
goto out;
ret = *singleton = g_object_new (G_TYPE_DBUS_CONNECTION,
"address", address,
"flags", G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT |
G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION,
"exit-on-close", TRUE,
NULL);
g_free (address);
}
else
{
ret = g_object_ref (*singleton);
}
g_assert (ret != NULL);
out:
G_UNLOCK (message_bus_lock);
return ret;
}
/**
* g_bus_get_sync:
* @bus_type: A #GBusType.
* @cancellable: A #GCancellable or %NULL.
* @error: Return location for error or %NULL.
*
* Synchronously connects to the message bus specified by @bus_type.
* Note that the returned object may shared with other callers,
* e.g. if two separate parts of a process calls this function with
* the same @bus_type, they will share the same object.
*
* This is a synchronous failable function. See g_bus_get() and
* g_bus_get_finish() for the asynchronous version.
*
* The returned object is a singleton, that is, shared with other
* callers of g_bus_get() and g_bus_get_sync() for @bus_type. In the
* event that you need a private message bus connection, use
* g_dbus_address_get_for_bus_sync() and
* g_dbus_connection_new_for_address().
*
* Note that the returned #GDBusConnection object will (usually) have
* the #GDBusConnection:exit-on-close property set to %TRUE.
*
* Returns: A #GDBusConnection or %NULL if @error is set. Free with g_object_unref().
*
* Since: 2.26
*/
GDBusConnection *
g_bus_get_sync (GBusType bus_type,
GCancellable *cancellable,
GError **error)
{
GDBusConnection *connection;
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
connection = get_uninitialized_connection (bus_type, cancellable, error);
if (connection == NULL)
goto out;
if (!g_initable_init (G_INITABLE (connection), cancellable, error))
{
g_object_unref (connection);
connection = NULL;
}
out:
return connection;
}
static void
bus_get_async_initable_cb (GObject *source_object,
GAsyncResult *res,
gpointer user_data)
{
GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (user_data);
GError *error;
error = NULL;
if (!g_async_initable_init_finish (G_ASYNC_INITABLE (source_object),
res,
&error))
{
g_assert (error != NULL);
g_simple_async_result_set_from_error (simple, error);
g_error_free (error);
g_object_unref (source_object);
}
else
{
g_simple_async_result_set_op_res_gpointer (simple,
source_object,
g_object_unref);
}
g_simple_async_result_complete_in_idle (simple);
g_object_unref (simple);
}
/**
* g_bus_get:
* @bus_type: A #GBusType.
* @cancellable: A #GCancellable or %NULL.
* @callback: A #GAsyncReadyCallback to call when the request is satisfied.
* @user_data: The data to pass to @callback.
*
* Asynchronously connects to the message bus specified by @bus_type.
*
* When the operation is finished, @callback will be invoked. You can
* then call g_bus_get_finish() to get the result of the operation.
*
* This is a asynchronous failable function. See g_bus_get_sync() for
* the synchronous version.
*
* Since: 2.26
*/
void
g_bus_get (GBusType bus_type,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GDBusConnection *connection;
GSimpleAsyncResult *simple;
GError *error;
simple = g_simple_async_result_new (NULL,
callback,
user_data,
g_bus_get);
error = NULL;
connection = get_uninitialized_connection (bus_type, cancellable, &error);
if (connection == NULL)
{
g_assert (error != NULL);
g_simple_async_result_set_from_error (simple, error);
g_error_free (error);
g_simple_async_result_complete_in_idle (simple);
g_object_unref (simple);
}
else
{
g_async_initable_init_async (G_ASYNC_INITABLE (connection),
G_PRIORITY_DEFAULT,
cancellable,
bus_get_async_initable_cb,
simple);
}
}
/**
* g_bus_get_finish:
* @res: A #GAsyncResult obtained from the #GAsyncReadyCallback passed to g_bus_get().
* @error: Return location for error or %NULL.
*
* Finishes an operation started with g_bus_get().
*
* The returned object is a singleton, that is, shared with other
* callers of g_bus_get() and g_bus_get_sync() for @bus_type. In the
* event that you need a private message bus connection, use
* g_dbus_address_get_for_bus() and
* g_dbus_connection_new_for_address().
*
* Note that the returned #GDBusConnection object will (usually) have
* the #GDBusConnection:exit-on-close property set to %TRUE.
*
* Returns: A #GDBusConnection or %NULL if @error is set. Free with g_object_unref().
*
* Since: 2.26
*/
GDBusConnection *
g_bus_get_finish (GAsyncResult *res,
GError **error)
{
GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (res);
GObject *object;
GDBusConnection *ret;
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == g_bus_get);
ret = NULL;
if (g_simple_async_result_propagate_error (simple, error))
goto out;
object = g_simple_async_result_get_op_res_gpointer (simple);
g_assert (object != NULL);
ret = g_object_ref (G_DBUS_CONNECTION (object));
out:
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
#define __G_DBUS_CONNECTION_C__
#include "gioaliasdef.c"
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