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glib/gio/gdbusconnection.c
Philip Withnall cfa36f5e96 Merge branch '3559-revert-dbus-method-invocation-refcounting' into 'main' 
Revert "gdbus: Fix leak of method invocation when registering an object with closures"

Closes #3559

See merge request GNOME/glib!4427
2024-12-11 12:41:16 +00:00

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/* GDBus - GLib D-Bus Library
*
* Copyright (C) 2008-2010 Red Hat, Inc.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* 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 2.1 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, see <http://www.gnu.org/licenses/>.
*
* Author: David Zeuthen <davidz@redhat.com>
*/
/*
* TODO for GDBus:
*
* - 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 (except
* 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 achieve 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=message, 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 "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 "ginitable.h"
#include "gasyncinitable.h"
#include "giostream.h"
#include "gasyncresult.h"
#include "gtask.h"
#include "gmarshal-internal.h"
#ifdef G_OS_UNIX
#include "gunixconnection.h"
#include "gunixfdmessage.h"
#endif
#include "glibintl.h"
#define G_DBUS_CONNECTION_FLAGS_ALL \
(G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT | \
G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER | \
G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS | \
G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION | \
G_DBUS_CONNECTION_FLAGS_DELAY_MESSAGE_PROCESSING | \
G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_REQUIRE_SAME_USER | \
G_DBUS_CONNECTION_FLAGS_CROSS_NAMESPACE)
/**
* GDBusConnection:
*
* 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 a [class@Gio.IOStream].
*
* This class is rarely used directly in D-Bus clients. If you are writing
* a D-Bus client, it is often easier to use the [func@Gio.bus_own_name],
* [func@Gio.bus_watch_name] or [func@Gio.DBusProxy.new_for_bus] APIs.
*
* As an exception to the usual GLib rule that a particular object must not
* be used by two threads at the same time, `GDBusConnection`s methods may be
* called from any thread. This is so that [func@Gio.bus_get] and
* [func@Gio.bus_get_sync] can safely return the same `GDBusConnection` when
* called from any thread.
*
* Most of the ways to obtain a `GDBusConnection` automatically initialize it
* (i.e. connect to D-Bus): for instance, [func@Gio.DBusConnection.new] and
* [func@Gio.bus_get], and the synchronous versions of those methods, give you
* an initialized connection. Language bindings for GIO should use
* [func@Gio.Initable.new] or [func@Gio.AsyncInitable.new_async], which also
* initialize the connection.
*
* If you construct an uninitialized `GDBusConnection`, such as via
* [ctor@GObject.Object.new], you must initialize it via [method@Gio.Initable.init] or
* [method@Gio.AsyncInitable.init_async] before using its methods or properties.
* Calling methods or accessing properties on a `GDBusConnection` that has not
* completed initialization successfully is considered to be invalid, and leads
* to undefined behaviour. In particular, if initialization fails with a
* `GError`, the only valid thing you can do with that `GDBusConnection` is to
* free it with [method@GObject.Object.unref].
*
* ## An example D-Bus server
*
* Here is an example for a D-Bus server:
* [gdbus-example-server.c](https://gitlab.gnome.org/GNOME/glib/-/blob/HEAD/gio/tests/gdbus-example-server.c)
*
* ## An example for exporting a subtree
*
* Here is an example for exporting a subtree:
* [gdbus-example-subtree.c](https://gitlab.gnome.org/GNOME/glib/-/blob/HEAD/gio/tests/gdbus-example-subtree.c)
*
* ## An example for file descriptor passing
*
* Here is an example for passing UNIX file descriptors:
* [gdbus-unix-fd-client.c](https://gitlab.gnome.org/GNOME/glib/-/blob/HEAD/gio/tests/gdbus-example-unix-fd-client.c)
*
* ## An example for exporting a GObject
*
* Here is an example for exporting a #GObject:
* [gdbus-example-export.c](https://gitlab.gnome.org/GNOME/glib/-/blob/HEAD/gio/tests/gdbus-example-export.c)
*
* Since: 2.26
*/
/* ---------------------------------------------------------------------------------------------------- */
typedef struct _GDBusConnectionClass GDBusConnectionClass;
/**
* GDBusConnectionClass:
* @closed: Signal class handler for the #GDBusConnection::closed signal.
*
* Class structure for #GDBusConnection.
*
* Since: 2.26
*/
struct _GDBusConnectionClass
{
/*< private >*/
GObjectClass parent_class;
/*< public >*/
/* Signals */
void (*closed) (GDBusConnection *connection,
gboolean remote_peer_vanished,
GError *error);
};
G_LOCK_DEFINE_STATIC (message_bus_lock);
static GWeakRef the_session_bus;
static GWeakRef the_system_bus;
/* Extra pseudo-member of GDBusSendMessageFlags.
* Set by initable_init() to indicate that despite not being initialized yet,
* enough of the only-valid-after-init members are set that we can send a
* message, and we're being called from its thread, so no memory barrier is
* required before accessing them.
*/
#define SEND_MESSAGE_FLAGS_INITIALIZING (1u << 31)
/* Same as SEND_MESSAGE_FLAGS_INITIALIZING, but in GDBusCallFlags */
#define CALL_FLAGS_INITIALIZING (1u << 31)
/* ---------------------------------------------------------------------------------------------------- */
typedef struct
{
GDestroyNotify callback;
gpointer user_data;
} CallDestroyNotifyData;
static gboolean
call_destroy_notify_data_in_idle (gpointer user_data)
{
CallDestroyNotifyData *data = user_data;
data->callback (data->user_data);
return FALSE;
}
static void
call_destroy_notify_data_free (CallDestroyNotifyData *data)
{
g_free (data);
}
/*
* call_destroy_notify: <internal>
* @context: (nullable): A #GMainContext or %NULL.
* @callback: (nullable): A #GDestroyNotify or %NULL.
* @user_data: Data to pass to @callback.
*
* Schedules @callback to run in @context.
*/
static void
call_destroy_notify (GMainContext *context,
GDestroyNotify callback,
gpointer user_data)
{
GSource *idle_source;
CallDestroyNotifyData *data;
if (callback == NULL)
return;
data = g_new0 (CallDestroyNotifyData, 1);
data->callback = callback;
data->user_data = user_data;
idle_source = g_idle_source_new ();
g_source_set_priority (idle_source, G_PRIORITY_DEFAULT);
g_source_set_callback (idle_source,
call_destroy_notify_data_in_idle,
data,
(GDestroyNotify) call_destroy_notify_data_free);
g_source_set_static_name (idle_source, "[gio] call_destroy_notify_data_in_idle");
g_source_attach (idle_source, context);
g_source_unref (idle_source);
}
/* ---------------------------------------------------------------------------------------------------- */
typedef struct
{
gatomicrefcount ref_count;
/* All remaining fields are immutable after construction. */
GDBusSignalCallback callback;
gpointer user_data;
GDestroyNotify user_data_free_func;
guint id;
GMainContext *context;
} SignalSubscriber;
static SignalSubscriber *
signal_subscriber_ref (SignalSubscriber *subscriber)
{
g_atomic_ref_count_inc (&subscriber->ref_count);
return subscriber;
}
static void
signal_subscriber_unref (SignalSubscriber *subscriber)
{
if (g_atomic_ref_count_dec (&subscriber->ref_count))
{
/* Destroy the user data. It doesn’t matter which thread
* signal_subscriber_unref() is called in (or whether it’s called with a
* lock held), as call_destroy_notify() always defers to the next
* #GMainContext iteration. */
call_destroy_notify (subscriber->context,
subscriber->user_data_free_func,
subscriber->user_data);
g_main_context_unref (subscriber->context);
g_free (subscriber);
}
}
typedef struct
{
/*
* 1 reference while waiting for GetNameOwner() to finish
* 1 reference for each SignalData that points to this one as its
* shared_name_watcher
*/
grefcount ref_count;
gchar *owner;
guint32 get_name_owner_serial;
} WatchedName;
static WatchedName *
watched_name_new (void)
{
WatchedName *watched_name = g_new0 (WatchedName, 1);
g_ref_count_init (&watched_name->ref_count);
watched_name->owner = NULL;
return g_steal_pointer (&watched_name);
}
typedef struct SignalData SignalData;
struct SignalData
{
gchar *rule;
gchar *sender;
gchar *interface_name;
gchar *member;
gchar *object_path;
gchar *arg0;
GDBusSignalFlags flags;
GPtrArray *subscribers; /* (owned) (element-type SignalSubscriber) */
/*
* If the sender is a well-known name, this is an unowned SignalData
* representing the NameOwnerChanged signal that tracks its owner.
* NULL if sender is NULL.
* NULL if sender is its own owner (a unique name or DBUS_SERVICE_DBUS).
*
* Invariants: if not NULL, then
* shared_name_watcher->sender == DBUS_SERVICE_DBUS
* shared_name_watcher->interface_name == DBUS_INTERFACE_DBUS
* shared_name_watcher->member == "NameOwnerChanged"
* shared_name_watcher->object_path == DBUS_PATH_DBUS
* shared_name_watcher->arg0 == sender
* shared_name_watcher->flags == NONE
* shared_name_watcher->watched_name == NULL
*/
SignalData *shared_name_watcher;
/*
* Non-NULL if this SignalData is another SignalData's shared_name_watcher.
* One reference for each SignalData that has this one as its
* shared_name_watcher.
* Otherwise NULL.
*/
WatchedName *watched_name;
};
static SignalData *
signal_data_new_take (gchar *rule,
gchar *sender,
gchar *interface_name,
gchar *member,
gchar *object_path,
gchar *arg0,
GDBusSignalFlags flags)
{
SignalData *signal_data = g_new0 (SignalData, 1);
signal_data->rule = rule;
signal_data->sender = sender;
signal_data->interface_name = interface_name;
signal_data->member = member;
signal_data->object_path = object_path;
signal_data->arg0 = arg0;
signal_data->flags = flags;
signal_data->subscribers = g_ptr_array_new_with_free_func ((GDestroyNotify) signal_subscriber_unref);
return g_steal_pointer (&signal_data);
}
static void
signal_data_free (SignalData *signal_data)
{
/* The SignalData should not be freed while it still has subscribers */
g_assert (signal_data->subscribers->len == 0);
/* The SignalData should not be freed while it is watching for
* NameOwnerChanged on behalf of another SignalData */
g_assert (signal_data->watched_name == NULL);
/* The SignalData should be detached from its name watcher, if any,
* before it is freed */
g_assert (signal_data->shared_name_watcher == NULL);
g_free (signal_data->rule);
g_free (signal_data->sender);
g_free (signal_data->interface_name);
g_free (signal_data->member);
g_free (signal_data->object_path);
g_free (signal_data->arg0);
g_ptr_array_unref (signal_data->subscribers);
g_free (signal_data);
}
/* ---------------------------------------------------------------------------------------------------- */
#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)->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)->lock); \
} while (FALSE)
#define CONNECTION_UNLOCK(obj) do { \
g_mutex_unlock (&(obj)->lock); \
} while (FALSE)
/* Flags in connection->atomic_flags */
enum {
FLAG_INITIALIZED = 1 << 0,
FLAG_EXIT_ON_CLOSE = 1 << 1,
FLAG_CLOSED = 1 << 2
};
struct _GDBusConnection
{
/*< private >*/
GObject parent_instance;
/* ------------------------------------------------------------------------ */
/* -- General object state ------------------------------------------------ */
/* ------------------------------------------------------------------------ */
/* General-purpose lock for most fields */
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.
*
* If you need both @lock and @init_lock, you must take @init_lock first.
*/
GMutex init_lock;
/* Set (by loading the contents of /var/lib/dbus/machine-id) the first time
* someone calls DBUS_INTERFACE_PEER.GetMachineId(). Protected by @lock.
*/
gchar *machine_id;
/* The underlying stream used for communication
* Read-only after initable_init(), so it may be read if you either
* hold @init_lock or check for initialization first.
*/
GIOStream *stream;
/* The object used for authentication (if any).
* Read-only after initable_init(), so it may be read if you either
* hold @init_lock or check for initialization first.
*/
GDBusAuth *auth;
/* Last serial used. Protected by @lock. */
guint32 last_serial;
/* The object used to send/receive messages.
* Read-only after initable_init(), so it may be read if you either
* hold @init_lock or check for initialization first.
*/
GDBusWorker *worker;
/* If connected to a message bus, this contains the unique name assigned to
* us by the bus (e.g. ":1.42").
* Read-only after initable_init(), so it may be read if you either
* hold @init_lock or check for initialization first.
*/
gchar *bus_unique_name;
/* The GUID returned by the other side if we authenticated as a client or
* the GUID to use if authenticating as a server.
* Read-only after initable_init(), so it may be read if you either
* hold @init_lock or check for initialization first.
*/
gchar *guid;
/* FLAG_INITIALIZED is set exactly when initable_init() has finished running.
* Inspect @initialization_error to see whether it succeeded or failed.
*
* FLAG_EXIT_ON_CLOSE is the exit-on-close property.
*
* FLAG_CLOSED is the closed property. It may be read at any time, but
* may only be written while holding @lock.
*/
gint atomic_flags; /* (atomic) */
/* If the connection could not be established during initable_init(),
* this GError will be set.
* Read-only after initable_init(), so it may be read if you either
* hold @init_lock or check for initialization first.
*/
GError *initialization_error;
/* The result of g_main_context_ref_thread_default() when the object
* was created (the GObject _init() function) - this is used for delivery
* of the :closed GObject signal.
*
* Only set in the GObject init function, so no locks are needed.
*/
GMainContext *main_context_at_construction;
/* Read-only construct properties, no locks needed */
gchar *address;
GDBusConnectionFlags flags;
/* Map used for managing method replies, protected by @lock */
GHashTable *map_method_serial_to_task; /* guint32 -> owned GTask* */
GHashTable *map_method_serial_to_name_watcher; /* guint32 -> unowned SignalData* */
/* Maps used for managing signal subscription, protected by @lock */
GHashTable *map_rule_to_signal_data; /* match rule (gchar*) -> SignalData */
GHashTable *map_id_to_signal_data; /* id (guint) -> SignalData */
GHashTable *map_sender_unique_name_to_signal_data_array; /* unique sender (gchar*) -> GPtrArray* of SignalData */
/* Maps used for managing exported objects and subtrees,
* protected by @lock
*/
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* */
/* Map used for storing last used serials for each thread, protected by @lock */
GHashTable *map_thread_to_last_serial;
/* Structure used for message filters, protected by @lock */
GPtrArray *filters;
/* Capabilities negotiated during authentication
* Read-only after initable_init(), so it may be read without holding a
* lock, if you check for initialization first.
*/
GDBusCapabilityFlags capabilities;
/* Protected by @init_lock */
GDBusAuthObserver *authentication_observer;
/* Read-only after initable_init(), so it may be read if you either
* hold @init_lock or check for initialization first.
*/
GCredentials *credentials;
/* set to TRUE when finalizing */
gboolean finalizing;
};
typedef struct ExportedObject ExportedObject;
static void exported_object_free (ExportedObject *eo);
typedef struct ExportedSubtree ExportedSubtree;
static ExportedSubtree *exported_subtree_ref (ExportedSubtree *es);
static void exported_subtree_unref (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);
static void schedule_method_call (GDBusConnection *connection,
GDBusMessage *message,
guint registration_id,
guint subtree_registration_id,
const GDBusInterfaceInfo *interface_info,
const GDBusMethodInfo *method_info,
const GDBusPropertyInfo *property_info,
GVariant *parameters,
const GDBusInterfaceVTable *vtable,
GMainContext *main_context,
gpointer user_data);
#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)
);
/*
* Check that all members of @connection that can only be accessed after
* the connection is initialized can safely be accessed. If not,
* log a critical warning. This function is a memory barrier.
*
* Returns: %TRUE if initialized
*/
static gboolean
check_initialized (GDBusConnection *connection)
{
/* The access to @atomic_flags isn't conditional, so that this function
* provides a memory barrier for thread-safety even if checks are disabled.
* (If you don't want this stricter guarantee, you can call
* g_return_if_fail (check_initialized (c)).)
*
* This isn't strictly necessary now that we've decided use of an
* uninitialized GDBusConnection is undefined behaviour, but it seems
* better to be as deterministic as is feasible.
*
* (Anything that could suffer a crash from seeing undefined values
* must have a race condition - thread A initializes the connection while
* thread B calls a method without initialization, hoping that thread A will
* win the race - so its behaviour is undefined anyway.)
*/
gint flags = g_atomic_int_get (&connection->atomic_flags);
g_return_val_if_fail (flags & FLAG_INITIALIZED, FALSE);
/* We can safely access this, due to the memory barrier above */
g_return_val_if_fail (connection->initialization_error == NULL, FALSE);
return TRUE;
}
typedef enum {
MAY_BE_UNINITIALIZED = (1<<1)
} CheckUnclosedFlags;
/*
* Check the same thing as check_initialized(), and also that the
* connection is not closed. If the connection is uninitialized,
* raise a critical warning (it's programmer error); if it's closed,
* raise a recoverable GError (it's a runtime error).
*
* This function is a memory barrier.
*
* Returns: %TRUE if initialized and not closed
*/
static gboolean
check_unclosed (GDBusConnection *connection,
CheckUnclosedFlags check,
GError **error)
{
/* check_initialized() is effectively inlined, so we don't waste time
* doing two memory barriers
*/
gint flags = g_atomic_int_get (&connection->atomic_flags);
if (!(check & MAY_BE_UNINITIALIZED))
{
g_return_val_if_fail (flags & FLAG_INITIALIZED, FALSE);
g_return_val_if_fail (connection->initialization_error == NULL, FALSE);
}
if (flags & FLAG_CLOSED)
{
g_set_error_literal (error,
G_IO_ERROR,
G_IO_ERROR_CLOSED,
_("The connection is closed"));
return FALSE;
}
return TRUE;
}
static GHashTable *alive_connections = NULL;
static void
g_dbus_connection_dispose (GObject *object)
{
GDBusConnection *connection = G_DBUS_CONNECTION (object);
G_LOCK (message_bus_lock);
CONNECTION_LOCK (connection);
if (connection->worker != NULL)
{
_g_dbus_worker_stop (connection->worker);
connection->worker = NULL;
if (alive_connections != NULL)
g_warn_if_fail (g_hash_table_remove (alive_connections, connection));
}
else
{
if (alive_connections != NULL)
g_warn_if_fail (!g_hash_table_contains (alive_connections, connection));
}
CONNECTION_UNLOCK (connection);
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);
connection->finalizing = TRUE;
purge_all_signal_subscriptions (connection);
purge_all_filters (connection);
g_ptr_array_unref (connection->filters);
if (connection->authentication_observer != NULL)
g_object_unref (connection->authentication_observer);
if (connection->auth != NULL)
g_object_unref (connection->auth);
if (connection->credentials)
g_object_unref (connection->credentials);
if (connection->stream != NULL)
{
g_object_unref (connection->stream);
connection->stream = NULL;
}
g_free (connection->address);
g_free (connection->guid);
g_free (connection->bus_unique_name);
if (connection->initialization_error != NULL)
g_error_free (connection->initialization_error);
g_hash_table_unref (connection->map_method_serial_to_task);
g_hash_table_unref (connection->map_method_serial_to_name_watcher);
g_hash_table_unref (connection->map_rule_to_signal_data);
g_hash_table_unref (connection->map_id_to_signal_data);
g_hash_table_unref (connection->map_sender_unique_name_to_signal_data_array);
g_hash_table_unref (connection->map_id_to_ei);
g_hash_table_unref (connection->map_object_path_to_eo);
g_hash_table_unref (connection->map_id_to_es);
g_hash_table_unref (connection->map_object_path_to_es);
g_hash_table_unref (connection->map_thread_to_last_serial);
g_main_context_unref (connection->main_context_at_construction);
g_free (connection->machine_id);
g_mutex_clear (&connection->init_lock);
g_mutex_clear (&connection->lock);
G_OBJECT_CLASS (g_dbus_connection_parent_class)->finalize (object);
}
/* called in any user thread, with the connection's lock not held */
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;
case PROP_FLAGS:
g_value_set_flags (value, g_dbus_connection_get_flags (connection));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/* called in any user thread, with the connection's lock not held */
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->stream = g_value_dup_object (value);
break;
case PROP_GUID:
connection->guid = g_value_dup_string (value);
break;
case PROP_ADDRESS:
connection->address = g_value_dup_string (value);
break;
case PROP_FLAGS:
connection->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->authentication_observer = g_value_dup_object (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/* Base-class implementation of GDBusConnection::closed.
*
* Called in a user thread, by the main context that was thread-default when
* the object was constructed.
*/
static void
g_dbus_connection_real_closed (GDBusConnection *connection,
gboolean remote_peer_vanished,
GError *error)
{
gint flags = g_atomic_int_get (&connection->atomic_flags);
/* Because atomic int access is a memory barrier, we can safely read
* initialization_error without a lock, as long as we do it afterwards.
*/
if (remote_peer_vanished &&
(flags & FLAG_EXIT_ON_CLOSE) != 0 &&
(flags & FLAG_INITIALIZED) != 0 &&
connection->initialization_error == NULL)
{
raise (SIGTERM);
}
}
static void
g_dbus_connection_class_init (GDBusConnectionClass *klass)
{
GObjectClass *gobject_class;
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.
*
* If this is passed on construction and is a #GSocketConnection,
* then the corresponding #GSocket will be put into non-blocking mode.
*
* While the #GDBusConnection is active, it will interact with this
* stream from a worker thread, so it is not safe to interact with
* the stream directly.
*
* Since: 2.26
*/
g_object_class_install_property (gobject_class,
PROP_STREAM,
g_param_spec_object ("stream", NULL, NULL,
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", NULL, NULL,
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", NULL, NULL,
G_TYPE_DBUS_CONNECTION_FLAGS,
G_DBUS_CONNECTION_FLAGS_NONE,
G_PARAM_READABLE |
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.
*
* Note that the
* [D-Bus specification](https://dbus.freedesktop.org/doc/dbus-specification.html#addresses)
* uses the term ‘UUID’ to refer to this, whereas GLib consistently uses the
* term ‘GUID’ for historical reasons.
*
* Despite its name, the format of #GDBusConnection:guid does not follow
* [RFC 4122](https://datatracker.ietf.org/doc/html/rfc4122) or the Microsoft
* GUID format.
*
* Since: 2.26
*/
g_object_class_install_property (gobject_class,
PROP_GUID,
g_param_spec_string ("guid", NULL, NULL,
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", NULL, NULL,
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", NULL, NULL,
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 `raise(SIGTERM)`) if the connection is closed by the
* remote peer.
*
* Note that #GDBusConnection objects returned by g_bus_get_finish()
* and g_bus_get_sync() will (usually) have this property set to %TRUE.
*
* Since: 2.26
*/
g_object_class_install_property (gobject_class,
PROP_EXIT_ON_CLOSE,
g_param_spec_boolean ("exit-on-close", NULL, NULL,
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", NULL, NULL,
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", NULL, NULL,
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: (nullable): a #GError with more details about the event or %NULL
*
* Emitted when the connection is closed.
*
* The cause of this event can be
*
* - If g_dbus_connection_close() is called. In this case
* @remote_peer_vanished is set to %FALSE and @error is %NULL.
*
* - If the remote peer closes the connection. In this case
* @remote_peer_vanished is set to %TRUE and @error is set.
*
* - If the remote peer sends invalid or malformed data. In this
* case @remote_peer_vanished is set to %FALSE and @error is set.
*
* 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 (I_("closed"),
G_TYPE_DBUS_CONNECTION,
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GDBusConnectionClass, closed),
NULL,
NULL,
_g_cclosure_marshal_VOID__BOOLEAN_BOXED,
G_TYPE_NONE,
2,
G_TYPE_BOOLEAN,
G_TYPE_ERROR);
g_signal_set_va_marshaller (signals[CLOSED_SIGNAL],
G_TYPE_FROM_CLASS (klass),
_g_cclosure_marshal_VOID__BOOLEAN_BOXEDv);
}
static void
g_dbus_connection_init (GDBusConnection *connection)
{
g_mutex_init (&connection->lock);
g_mutex_init (&connection->init_lock);
connection->map_method_serial_to_task = g_hash_table_new_full (g_direct_hash, g_direct_equal, NULL, g_object_unref);
connection->map_method_serial_to_name_watcher = g_hash_table_new_full (g_direct_hash, g_direct_equal, NULL, NULL);
connection->map_rule_to_signal_data = g_hash_table_new (g_str_hash,
g_str_equal);
connection->map_id_to_signal_data = g_hash_table_new (g_direct_hash,
g_direct_equal);
connection->map_sender_unique_name_to_signal_data_array = g_hash_table_new_full (g_str_hash,
g_str_equal,
g_free,
(GDestroyNotify) g_ptr_array_unref);
connection->map_object_path_to_eo = g_hash_table_new_full (g_str_hash,
g_str_equal,
NULL,
(GDestroyNotify) exported_object_free);
connection->map_id_to_ei = g_hash_table_new (g_direct_hash,
g_direct_equal);
connection->map_object_path_to_es = g_hash_table_new_full (g_str_hash,
g_str_equal,
NULL,
(GDestroyNotify) exported_subtree_unref);
connection->map_id_to_es = g_hash_table_new (g_direct_hash,
g_direct_equal);
connection->map_thread_to_last_serial = g_hash_table_new (g_direct_hash,
g_direct_equal);
connection->main_context_at_construction = g_main_context_ref_thread_default ();
connection->filters = g_ptr_array_new ();
}
/**
* g_dbus_connection_get_stream:
* @connection: a #GDBusConnection
*
* Gets the underlying stream used for IO.
*
* While the #GDBusConnection is active, it will interact with this
* stream from a worker thread, so it is not safe to interact with
* the stream directly.
*
* Returns: (transfer none) (not nullable): 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);
/* do not use g_return_val_if_fail(), we want the memory barrier */
if (!check_initialized (connection))
return NULL;
return connection->stream;
}
/**
* g_dbus_connection_start_message_processing:
* @connection: a #GDBusConnection
*
* If @connection was created with
* %G_DBUS_CONNECTION_FLAGS_DELAY_MESSAGE_PROCESSING, this method
* starts processing messages. Does nothing on if @connection wasn't
* created with this flag or if the method has already been called.
*
* Since: 2.26
*/
void
g_dbus_connection_start_message_processing (GDBusConnection *connection)
{
g_return_if_fail (G_IS_DBUS_CONNECTION (connection));
/* do not use g_return_val_if_fail(), we want the memory barrier */
if (!check_initialized (connection))
return;
g_assert (connection->worker != NULL);
_g_dbus_worker_unfreeze (connection->worker);
}
/**
* 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)
{
gint flags;
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
flags = g_atomic_int_get (&connection->atomic_flags);
return (flags & FLAG_CLOSED) ? TRUE : FALSE;
}
/**
* 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);
/* do not use g_return_val_if_fail(), we want the memory barrier */
if (!check_initialized (connection))
return G_DBUS_CAPABILITY_FLAGS_NONE;
return connection->capabilities;
}
/**
* g_dbus_connection_get_flags:
* @connection: a #GDBusConnection
*
* Gets the flags used to construct this connection
*
* Returns: zero or more flags from the #GDBusConnectionFlags enumeration
*
* Since: 2.60
*/
GDBusConnectionFlags
g_dbus_connection_get_flags (GDBusConnection *connection)
{
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), G_DBUS_CONNECTION_FLAGS_NONE);
/* do not use g_return_val_if_fail(), we want the memory barrier */
if (!check_initialized (connection))
return G_DBUS_CONNECTION_FLAGS_NONE;
return connection->flags;
}
/* ---------------------------------------------------------------------------------------------------- */
/* Called in a temporary thread without holding locks. */
static void
flush_in_thread_func (GTask *task,
gpointer source_object,
gpointer task_data,
GCancellable *cancellable)
{
GError *error = NULL;
if (g_dbus_connection_flush_sync (source_object,
cancellable,
&error))
g_task_return_boolean (task, TRUE);
else
g_task_return_error (task, error);
}
/**
* g_dbus_connection_flush:
* @connection: a #GDBusConnection
* @cancellable: (nullable): a #GCancellable or %NULL
* @callback: (nullable): 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 flushes @connection, that is, writes all queued
* outgoing message to the transport and then flushes the transport
* (using g_output_stream_flush_async()). This is useful in programs
* that wants to emit a D-Bus signal and then exit immediately. Without
* flushing the connection, there is no guaranteed that the message has
* been sent to the networking buffers in the OS kernel.
*
* This is an asynchronous method. When the operation is finished,
* @callback will be invoked in the
* [thread-default main context][g-main-context-push-thread-default]
* of the thread you are calling this method from. You can
* then call g_dbus_connection_flush_finish() to get the result of the
* operation. See g_dbus_connection_flush_sync() for the synchronous
* version.
*
* Since: 2.26
*/
void
g_dbus_connection_flush (GDBusConnection *connection,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GTask *task;
g_return_if_fail (G_IS_DBUS_CONNECTION (connection));
task = g_task_new (connection, cancellable, callback, user_data);
g_task_set_source_tag (task, g_dbus_connection_flush);
g_task_run_in_thread (task, flush_in_thread_func);
g_object_unref (task);
}
/**
* g_dbus_connection_flush_finish:
* @connection: a #GDBusConnection
* @res: a #GAsyncResult obtained from the #GAsyncReadyCallback passed
* to g_dbus_connection_flush()
* @error: return location for error or %NULL
*
* Finishes an operation started with g_dbus_connection_flush().
*
* Returns: %TRUE if the operation succeeded, %FALSE if @error is set
*
* Since: 2.26
*/
gboolean
g_dbus_connection_flush_finish (GDBusConnection *connection,
GAsyncResult *res,
GError **error)
{
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
g_return_val_if_fail (g_task_is_valid (res, connection), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
return g_task_propagate_boolean (G_TASK (res), error);
}
/**
* g_dbus_connection_flush_sync:
* @connection: a #GDBusConnection
* @cancellable: (nullable): a #GCancellable or %NULL
* @error: return location for error or %NULL
*
* Synchronously flushes @connection. The calling thread is blocked
* until this is done. See g_dbus_connection_flush() for the
* asynchronous version of this method and more details about what it
* does.
*
* Returns: %TRUE if the operation succeeded, %FALSE if @error is set
*
* Since: 2.26
*/
gboolean
g_dbus_connection_flush_sync (GDBusConnection *connection,
GCancellable *cancellable,
GError **error)
{
gboolean ret;
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
ret = FALSE;
/* This is only a best-effort attempt to see whether the connection is
* closed, so it doesn't need the lock. If the connection closes just
* after this check, but before scheduling the flush operation, the
* result will be more or less the same as if the connection closed while
* the flush operation was pending - it'll fail with either CLOSED or
* CANCELLED.
*/
if (!check_unclosed (connection, 0, error))
goto out;
g_assert (connection->worker != NULL);
ret = _g_dbus_worker_flush_sync (connection->worker,
cancellable,
error);
out:
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
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);
}
/* Called in a user thread that has acquired the main context that was
* thread-default when the object was constructed
*/
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.
* FLAG_CLOSED must already have been set.
*/
static void
schedule_closed_unlocked (GDBusConnection *connection,
gboolean remote_peer_vanished,
GError *error)
{
GSource *idle_source;
EmitClosedData *data;
CONNECTION_ENSURE_LOCK (connection);
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_set_static_name (idle_source, "[gio] emit_closed_in_idle");
g_source_attach (idle_source, connection->main_context_at_construction);
g_source_unref (idle_source);
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_connection_close:
* @connection: a #GDBusConnection
* @cancellable: (nullable): a #GCancellable or %NULL
* @callback: (nullable): 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
*
* 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, see #GDBusConnection:exit-on-close).
*
* Once the connection is closed, operations such as sending a message
* will return with the error %G_IO_ERROR_CLOSED. Closing a connection
* will not automatically flush the connection so queued messages may
* be lost. Use g_dbus_connection_flush() if you need such guarantees.
*
* If @connection is already closed, this method fails with
* %G_IO_ERROR_CLOSED.
*
* When @connection has been closed, the #GDBusConnection::closed
* signal is emitted in the
* [thread-default main context][g-main-context-push-thread-default]
* of the thread that @connection was constructed in.
*
* This is an asynchronous method. When the operation is finished,
* @callback will be invoked in the
* [thread-default main context][g-main-context-push-thread-default]
* of the thread you are calling this method from. You can
* then call g_dbus_connection_close_finish() to get the result of the
* operation. See g_dbus_connection_close_sync() for the synchronous
* version.
*
* Since: 2.26
*/
void
g_dbus_connection_close (GDBusConnection *connection,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GTask *task;
g_return_if_fail (G_IS_DBUS_CONNECTION (connection));
/* do not use g_return_val_if_fail(), we want the memory barrier */
if (!check_initialized (connection))
return;
g_assert (connection->worker != NULL);
task = g_task_new (connection, cancellable, callback, user_data);
g_task_set_source_tag (task, g_dbus_connection_close);
_g_dbus_worker_close (connection->worker, task);
g_object_unref (task);
}
/**
* g_dbus_connection_close_finish:
* @connection: a #GDBusConnection
* @res: a #GAsyncResult obtained from the #GAsyncReadyCallback passed
* to g_dbus_connection_close()
* @error: return location for error or %NULL
*
* Finishes an operation started with g_dbus_connection_close().
*
* Returns: %TRUE if the operation succeeded, %FALSE if @error is set
*
* Since: 2.26
*/
gboolean
g_dbus_connection_close_finish (GDBusConnection *connection,
GAsyncResult *res,
GError **error)
{
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
g_return_val_if_fail (g_task_is_valid (res, connection), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
return g_task_propagate_boolean (G_TASK (res), error);
}
typedef struct {
GMainLoop *loop;
GAsyncResult *result;
} SyncCloseData;
/* Can be called by any thread, without the connection lock */
static void
sync_close_cb (GObject *source_object,
GAsyncResult *res,
gpointer user_data)
{
SyncCloseData *data = user_data;
data->result = g_object_ref (res);
g_main_loop_quit (data->loop);
}
/**
* g_dbus_connection_close_sync:
* @connection: a #GDBusConnection
* @cancellable: (nullable): a #GCancellable or %NULL
* @error: return location for error or %NULL
*
* Synchronously closes @connection. The calling thread is blocked
* until this is done. See g_dbus_connection_close() for the
* asynchronous version of this method and more details about what it
* does.
*
* Returns: %TRUE if the operation succeeded, %FALSE if @error is set
*
* Since: 2.26
*/
gboolean
g_dbus_connection_close_sync (GDBusConnection *connection,
GCancellable *cancellable,
GError **error)
{
gboolean ret;
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
ret = FALSE;
if (check_unclosed (connection, 0, error))
{
GMainContext *context;
SyncCloseData data;
context = g_main_context_new ();
g_main_context_push_thread_default (context);
data.loop = g_main_loop_new (context, TRUE);
data.result = NULL;
g_dbus_connection_close (connection, cancellable, sync_close_cb, &data);
g_main_loop_run (data.loop);
ret = g_dbus_connection_close_finish (connection, data.result, error);
g_object_unref (data.result);
g_main_loop_unref (data.loop);
g_main_context_pop_thread_default (context);
g_main_context_unref (context);
}
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_connection_get_last_serial:
* @connection: a #GDBusConnection
*
* Retrieves the last serial number assigned to a #GDBusMessage on
* the current thread. This includes messages sent via both low-level
* API such as g_dbus_connection_send_message() as well as
* high-level API such as g_dbus_connection_emit_signal(),
* g_dbus_connection_call() or g_dbus_proxy_call().
*
* Returns: the last used serial or zero when no message has been sent
* within the current thread
*
* Since: 2.34
*/
guint32
g_dbus_connection_get_last_serial (GDBusConnection *connection)
{
guint32 ret;
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), 0);
CONNECTION_LOCK (connection);
ret = GPOINTER_TO_UINT (g_hash_table_lookup (connection->map_thread_to_last_serial,
g_thread_self ()));
CONNECTION_UNLOCK (connection);
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
/* Can be called by any thread, with the connection lock held */
static gboolean
g_dbus_connection_send_message_unlocked (GDBusConnection *connection,
GDBusMessage *message,
GDBusSendMessageFlags flags,
guint32 *out_serial,
GError **error)
{
guchar *blob;
gsize blob_size;
guint32 serial_to_use;
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 */
if (out_serial != NULL)
*out_serial = 0;
/* If we're in initable_init(), don't check for being initialized, to avoid
* chicken-and-egg problems. initable_init() is responsible for setting up
* our prerequisites (mainly connection->worker), and only calling us
* from its own thread (so no memory barrier is needed).
*/
if (!check_unclosed (connection,
(flags & SEND_MESSAGE_FLAGS_INITIALIZING) ? MAY_BE_UNINITIALIZED : 0,
error))
return FALSE;
blob = g_dbus_message_to_blob (message,
&blob_size,
connection->capabilities,
error);
if (blob == NULL)
return FALSE;
if (flags & G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL)
serial_to_use = g_dbus_message_get_serial (message);
else
serial_to_use = ++connection->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->auth to encode the blob */
if (out_serial != NULL)
*out_serial = serial_to_use;
/* store used serial for the current thread */
/* TODO: watch the thread disposal and remove associated record
* from hashtable
* - see https://bugzilla.gnome.org/show_bug.cgi?id=676825#c7
*/
g_hash_table_replace (connection->map_thread_to_last_serial,
g_thread_self (),
GUINT_TO_POINTER (serial_to_use));
if (!(flags & G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL))
g_dbus_message_set_serial (message, serial_to_use);
g_dbus_message_lock (message);
_g_dbus_worker_send_message (connection->worker,
message,
(gchar*) blob, /* transfer ownership */
blob_size);
return TRUE;
}
/**
* g_dbus_connection_send_message:
* @connection: a #GDBusConnection
* @message: a #GDBusMessage
* @flags: flags affecting how the message is sent
* @out_serial: (out) (optional): 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.
*
* Unless @flags contain the
* %G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL flag, the serial number
* will be assigned by @connection and set on @message via
* g_dbus_message_set_serial(). If @out_serial is not %NULL, then the
* serial number used will be written to this location prior to
* submitting the message to the underlying transport. While it has a `volatile`
* qualifier, this is a historical artifact and the argument passed to it should
* not be `volatile`.
*
* If @connection is closed then the operation will fail with
* %G_IO_ERROR_CLOSED. If @message is not well-formed,
* the operation fails with %G_IO_ERROR_INVALID_ARGUMENT.
*
* See this [server][gdbus-server] and [client][gdbus-unix-fd-client]
* for an example of how to use this low-level API to send and receive
* UNIX file descriptors.
*
* Note that @message must be unlocked, unless @flags contain the
* %G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL flag.
*
* 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,
GDBusSendMessageFlags flags,
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 ((flags & G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL) || !g_dbus_message_get_locked (message), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
CONNECTION_LOCK (connection);
ret = g_dbus_connection_send_message_unlocked (connection, message, flags, (guint32 *) out_serial, error);
CONNECTION_UNLOCK (connection);
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
typedef struct
{
guint32 serial;
gulong cancellable_handler_id;
GSource *cancelled_idle_source; /* (owned) (nullable) */
GSource *timeout_source; /* (owned) (nullable) */
gboolean delivered;
} SendMessageData;
/* Can be called from any thread with or without lock held */
static void
send_message_data_free (SendMessageData *data)
{
/* These should already have been cleared by send_message_with_reply_cleanup(). */
g_assert (data->timeout_source == NULL);
g_assert (data->cancellable_handler_id == 0);
g_slice_free (SendMessageData, data);
}
/* ---------------------------------------------------------------------------------------------------- */
/* can be called from any thread with lock held; @task is (transfer none) */
static void
send_message_with_reply_cleanup (GTask *task, gboolean remove)
{
GDBusConnection *connection = g_task_get_source_object (task);
SendMessageData *data = g_task_get_task_data (task);
CONNECTION_ENSURE_LOCK (connection);
g_assert (!data->delivered);
data->delivered = TRUE;
if (data->timeout_source != NULL)
{
g_source_destroy (data->timeout_source);
g_clear_pointer (&data->timeout_source, g_source_unref);
}
if (data->cancellable_handler_id > 0)
{
g_cancellable_disconnect (g_task_get_cancellable (task), data->cancellable_handler_id);
data->cancellable_handler_id = 0;
}
if (data->cancelled_idle_source != NULL)
{
g_source_destroy (data->cancelled_idle_source);
g_clear_pointer (&data->cancelled_idle_source, g_source_unref);
}
if (remove)
{
gboolean removed = g_hash_table_remove (connection->map_method_serial_to_task,
GUINT_TO_POINTER (data->serial));
g_warn_if_fail (removed);
}
}
/* ---------------------------------------------------------------------------------------------------- */
/* Called from GDBus worker thread with lock held; @task is (transfer none). */
static void
send_message_data_deliver_reply_unlocked (GTask *task,
GDBusMessage *reply)
{
SendMessageData *data = g_task_get_task_data (task);
if (data->delivered)
goto out;
g_task_return_pointer (task, g_object_ref (reply), g_object_unref);
send_message_with_reply_cleanup (task, TRUE);
out:
;
}
/* Called from a user thread, lock is not held; @task is (transfer none) */
static void
send_message_data_deliver_error (GTask *task,
GQuark domain,
gint code,
const char *message)
{
GDBusConnection *connection = g_task_get_source_object (task);
SendMessageData *data = g_task_get_task_data (task);
CONNECTION_LOCK (connection);
if (data->delivered)
{
CONNECTION_UNLOCK (connection);
return;
}
/* Hold a ref on @task as send_message_with_reply_cleanup() will remove it
* from the task map and could end up dropping the last reference */
g_object_ref (task);
send_message_with_reply_cleanup (task, TRUE);
CONNECTION_UNLOCK (connection);
g_task_return_new_error_literal (task, domain, code, message);
g_object_unref (task);
}
/* ---------------------------------------------------------------------------------------------------- */
/* Called from a user thread, lock is not held; @task is (transfer none) */
static gboolean
send_message_with_reply_cancelled_idle_cb (gpointer user_data)
{
GTask *task = user_data;
send_message_data_deliver_error (task, G_IO_ERROR, G_IO_ERROR_CANCELLED,
_("Operation was cancelled"));
return G_SOURCE_REMOVE;
}
/* Can be called from any thread with or without lock held */
static void
send_message_with_reply_cancelled_cb (GCancellable *cancellable,
gpointer user_data)
{
GTask *task = user_data;
SendMessageData *data = g_task_get_task_data (task);
/* postpone cancellation to idle handler since we may be called directly
* via g_cancellable_connect() (e.g. holding lock)
*/
if (data->cancelled_idle_source != NULL)
return;
data->cancelled_idle_source = g_idle_source_new ();
g_source_set_static_name (data->cancelled_idle_source, "[gio] send_message_with_reply_cancelled_idle_cb");
g_task_attach_source (task, data->cancelled_idle_source, send_message_with_reply_cancelled_idle_cb);
}
/* ---------------------------------------------------------------------------------------------------- */
/* Called from a user thread, lock is not held; @task is (transfer none) */
static gboolean
send_message_with_reply_timeout_cb (gpointer user_data)
{
GTask *task = user_data;
send_message_data_deliver_error (task, G_IO_ERROR, G_IO_ERROR_TIMED_OUT,
_("Timeout was reached"));
return G_SOURCE_REMOVE;
}
/* ---------------------------------------------------------------------------------------------------- */
/* Called from a user thread, connection's lock is held */
static void
g_dbus_connection_send_message_with_reply_unlocked (GDBusConnection *connection,
GDBusMessage *message,
GDBusSendMessageFlags flags,
gint timeout_msec,
guint32 *out_serial,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GTask *task;
SendMessageData *data;
GError *error = NULL;
guint32 serial;
if (out_serial == NULL)
out_serial = &serial;
*out_serial = 0;
if (timeout_msec == -1)
timeout_msec = 25 * 1000;
data = g_slice_new0 (SendMessageData);
task = g_task_new (connection, cancellable, callback, user_data);
g_task_set_source_tag (task,
g_dbus_connection_send_message_with_reply_unlocked);
g_task_set_task_data (task, data, (GDestroyNotify) send_message_data_free);
if (g_task_return_error_if_cancelled (task))
{
g_object_unref (task);
return;
}
if (!g_dbus_connection_send_message_unlocked (connection, message, flags, out_serial, &error))
{
g_task_return_error (task, error);
g_object_unref (task);
return;
}
data->serial = *out_serial;
if (cancellable != NULL)
{
data->cancellable_handler_id = g_cancellable_connect (cancellable,
G_CALLBACK (send_message_with_reply_cancelled_cb),
g_object_ref (task),
g_object_unref);
}
if (timeout_msec != G_MAXINT)
{
data->timeout_source = g_timeout_source_new (timeout_msec);
g_source_set_static_name (data->timeout_source, "[gio] send_message_with_reply_unlocked");
g_task_attach_source (task, data->timeout_source,
(GSourceFunc) send_message_with_reply_timeout_cb);
}
g_hash_table_insert (connection->map_method_serial_to_task,
GUINT_TO_POINTER (*out_serial),
g_steal_pointer (&task));
}
/**
* g_dbus_connection_send_message_with_reply:
* @connection: a #GDBusConnection
* @message: a #GDBusMessage
* @flags: flags affecting how the message is sent
* @timeout_msec: the timeout in milliseconds, -1 to use the default
* timeout or %G_MAXINT for no timeout
* @out_serial: (out) (optional): return location for serial number assigned
* to @message when sending it or %NULL
* @cancellable: (nullable): a #GCancellable or %NULL
* @callback: (nullable): 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.
*
* Unless @flags contain the
* %G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL flag, the serial number
* will be assigned by @connection and set on @message via
* g_dbus_message_set_serial(). If @out_serial is not %NULL, then the
* serial number used will be written to this location prior to
* submitting the message to the underlying transport. While it has a `volatile`
* qualifier, this is a historical artifact and the argument passed to it should
* not be `volatile`.
*
* 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
* [thread-default main context][g-main-context-push-thread-default]
* 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.
*
* Note that @message must be unlocked, unless @flags contain the
* %G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL flag.
*
* See this [server][gdbus-server] and [client][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,
GDBusSendMessageFlags flags,
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 ((flags & G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL) || !g_dbus_message_get_locked (message));
g_return_if_fail (timeout_msec >= 0 || timeout_msec == -1);
CONNECTION_LOCK (connection);
g_dbus_connection_send_message_with_reply_unlocked (connection,
message,
flags,
timeout_msec,
(guint32 *) 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: teturn 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
* occurred. 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 this [server][gdbus-server] and [client][gdbus-unix-fd-client]
* for an example of how to use this low-level API to send and receive
* UNIX file descriptors.
*
* Returns: (transfer full): a locked #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)
{
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
g_return_val_if_fail (g_task_is_valid (res, connection), NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
return g_task_propagate_pointer (G_TASK (res), error);
}
/* ---------------------------------------------------------------------------------------------------- */
typedef struct
{
GAsyncResult *res;
GMainContext *context;
GMainLoop *loop;
} SendMessageSyncData;
/* Called from a user thread, lock is not held */
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
* @flags: flags affecting how the message is sent.
* @timeout_msec: the timeout in milliseconds, -1 to use the default
* timeout or %G_MAXINT for no timeout
* @out_serial: (out) (optional): return location for serial number
* assigned to @message when sending it or %NULL
* @cancellable: (nullable): 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.
*
* Unless @flags contain the
* %G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL flag, the serial number
* will be assigned by @connection and set on @message via
* g_dbus_message_set_serial(). If @out_serial is not %NULL, then the
* serial number used will be written to this location prior to
* submitting the message to the underlying transport. While it has a `volatile`
* qualifier, this is a historical artifact and the argument passed to it should
* not be `volatile`.
*
* 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
* occurred. 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 this [server][gdbus-server] and [client][gdbus-unix-fd-client]
* for an example of how to use this low-level API to send and receive
* UNIX file descriptors.
*
* Note that @message must be unlocked, unless @flags contain the
* %G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL flag.
*
* Returns: (transfer full): a locked #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,
GDBusSendMessageFlags flags,
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 ((flags & G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL) || !g_dbus_message_get_locked (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.res = NULL;
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,
flags,
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);
if (data.res)
g_object_unref (data.res);
return reply;
}
/* ---------------------------------------------------------------------------------------------------- */
/*
* Called in any thread.
* Must hold the connection lock when calling this, unless
* connection->finalizing is TRUE.
*/
static void
name_watcher_unref_watched_name (GDBusConnection *connection,
SignalData *name_watcher)
{
WatchedName *watched_name = name_watcher->watched_name;
g_assert (watched_name != NULL);
if (!g_ref_count_dec (&watched_name->ref_count))
return;
/* Removing watched_name from the name_watcher may result in
* name_watcher being freed, so we must make sure name_watcher is no
* longer in map_method_serial_to_name_watcher.
*
* If we stop watching the name while our GetNameOwner call was still
* in-flight, then when the reply eventually arrives, we will not find
* its serial number in the map and harmlessly ignore it as a result. */
if (watched_name->get_name_owner_serial != 0)
g_hash_table_remove (connection->map_method_serial_to_name_watcher,
GUINT_TO_POINTER (watched_name->get_name_owner_serial));
name_watcher->watched_name = NULL;
g_free (watched_name->owner);
g_free (watched_name);
}
/* called in GDBusWorker thread with lock held */
static void
name_watcher_set_name_owner_unlocked (SignalData *name_watcher,
const char *new_owner)
{
if (new_owner != NULL && new_owner[0] == '\0')
new_owner = NULL;
g_assert (name_watcher->watched_name != NULL);
g_set_str (&name_watcher->watched_name->owner, new_owner);
}
/* called in GDBusWorker thread with lock held */
static void
name_watcher_deliver_name_owner_changed_unlocked (SignalData *name_watcher,
GDBusMessage *message)
{
GVariant *body;
body = g_dbus_message_get_body (message);
if (G_LIKELY (body != NULL && g_variant_is_of_type (body, G_VARIANT_TYPE ("(sss)"))))
{
const char *name;
const char *new_owner;
g_variant_get (body, "(&s&s&s)", &name, NULL, &new_owner);
/* Our caller already checked this */
g_assert (g_strcmp0 (name_watcher->arg0, name) == 0);
/* FIXME: This should be validating that `new_owner` is a unique name,
* but IBus’ implementation of a message bus is not compliant with the spec.
* See https://gitlab.gnome.org/GNOME/glib/-/issues/3353 */
if (G_LIKELY (new_owner[0] == '\0' || g_dbus_is_name (new_owner)))
name_watcher_set_name_owner_unlocked (name_watcher, new_owner);
else
g_warning ("Received NameOwnerChanged signal with invalid owner \"%s\" for \"%s\"",
new_owner, name);
}
else
{
g_warning ("Received NameOwnerChanged signal with unexpected "
"signature %s",
body == NULL ? "()" : g_variant_get_type_string (body));
}
}
/* called in GDBusWorker thread with lock held */
static void
name_watcher_deliver_get_name_owner_reply_unlocked (SignalData *name_watcher,
GDBusConnection *connection,
GDBusMessage *message)
{
GDBusMessageType type;
GVariant *body;
WatchedName *watched_name;
watched_name = name_watcher->watched_name;
g_assert (watched_name != NULL);
g_assert (watched_name->get_name_owner_serial != 0);
type = g_dbus_message_get_message_type (message);
body = g_dbus_message_get_body (message);
if (type == G_DBUS_MESSAGE_TYPE_ERROR)
{
if (g_strcmp0 (g_dbus_message_get_error_name (message),
DBUS_ERROR_NAME_HAS_NO_OWNER))
name_watcher_set_name_owner_unlocked (name_watcher, NULL);
/* else it's something like NoReply or AccessDenied, which tells
* us nothing - leave the owner set to whatever we most recently
* learned from NameOwnerChanged, or NULL */
}
else if (type != G_DBUS_MESSAGE_TYPE_METHOD_RETURN)
{
g_warning ("Received GetNameOwner reply with unexpected type %d",
type);
}
else if (G_LIKELY (body != NULL && g_variant_is_of_type (body, G_VARIANT_TYPE ("(s)"))))
{
const char *new_owner;
g_variant_get (body, "(&s)", &new_owner);
/* FIXME: This should be validating that `new_owner` is a unique name,
* but IBus’ implementation of a message bus is not compliant with the spec.
* See https://gitlab.gnome.org/GNOME/glib/-/issues/3353 */
if (G_LIKELY (g_dbus_is_name (new_owner)))
name_watcher_set_name_owner_unlocked (name_watcher, new_owner);
else
g_warning ("Received GetNameOwner reply with invalid owner \"%s\" for \"%s\"",
new_owner, name_watcher->arg0);
}
else
{
g_warning ("Received GetNameOwner reply with unexpected signature %s",
body == NULL ? "()" : g_variant_get_type_string (body));
}
g_hash_table_remove (connection->map_method_serial_to_name_watcher,
GUINT_TO_POINTER (watched_name->get_name_owner_serial));
watched_name->get_name_owner_serial = 0;
}
/* Called in a user thread, lock is held */
static void
name_watcher_call_get_name_owner_unlocked (GDBusConnection *connection,
SignalData *name_watcher)
{
GDBusMessage *message;
GError *local_error = NULL;
WatchedName *watched_name;
g_assert (g_strcmp0 (name_watcher->sender, DBUS_SERVICE_DBUS) == 0);
g_assert (g_strcmp0 (name_watcher->interface_name, DBUS_INTERFACE_DBUS) == 0);
g_assert (g_strcmp0 (name_watcher->member, "NameOwnerChanged") == 0);
g_assert (g_strcmp0 (name_watcher->object_path, DBUS_PATH_DBUS) == 0);
/* arg0 of the NameOwnerChanged message is the well-known name whose owner
* we are interested in */
g_assert (g_dbus_is_name (name_watcher->arg0));
g_assert (name_watcher->flags == G_DBUS_SIGNAL_FLAGS_NONE);
watched_name = name_watcher->watched_name;
g_assert (watched_name != NULL);
g_assert (watched_name->owner == NULL);
g_assert (watched_name->get_name_owner_serial == 0);
g_assert (name_watcher->shared_name_watcher == NULL);
message = g_dbus_message_new_method_call (DBUS_SERVICE_DBUS,
DBUS_PATH_DBUS,
DBUS_INTERFACE_DBUS,
"GetNameOwner");
g_dbus_message_set_body (message, g_variant_new ("(s)", name_watcher->arg0));
if (g_dbus_connection_send_message_unlocked (connection, message,
G_DBUS_SEND_MESSAGE_FLAGS_NONE,
&watched_name->get_name_owner_serial,
&local_error))
{
g_assert (watched_name->get_name_owner_serial != 0);
g_hash_table_insert (connection->map_method_serial_to_name_watcher,
GUINT_TO_POINTER (watched_name->get_name_owner_serial),
name_watcher);
}
else
{
g_critical ("Error while sending GetNameOwner() message: %s",
local_error->message);
g_clear_error (&local_error);
g_assert (watched_name->get_name_owner_serial == 0);
}
g_object_unref (message);
}
/* ---------------------------------------------------------------------------------------------------- */
typedef struct
{
guint id;
guint ref_count;
GDBusMessageFilterFunction filter_function;
gpointer user_data;
GDestroyNotify user_data_free_func;
GMainContext *context;
} FilterData;
static void
filter_data_destroy (FilterData *filter, gboolean notify_sync)
{
if (notify_sync)
{
if (filter->user_data_free_func != NULL)
filter->user_data_free_func (filter->user_data);
}
else
{
call_destroy_notify (filter->context,
filter->user_data_free_func,
filter->user_data);
}
g_main_context_unref (filter->context);
g_free (filter);
}
/* requires CONNECTION_LOCK */
static FilterData **
copy_filter_list (GPtrArray *filters)
{
FilterData **copy;
guint n;
copy = g_new (FilterData *, filters->len + 1);
for (n = 0; n < filters->len; n++)
{
copy[n] = filters->pdata[n];
copy[n]->ref_count++;
}
copy[n] = NULL;
return copy;
}
/* requires CONNECTION_LOCK */
static void
free_filter_list (FilterData **filters)
{
guint n;
for (n = 0; filters[n]; n++)
{
filters[n]->ref_count--;
if (filters[n]->ref_count == 0)
filter_data_destroy (filters[n], FALSE);
}
g_free (filters);
}
/* Called in GDBusWorker's thread - we must not block - with no lock held */
static void
on_worker_message_received (GDBusWorker *worker,
GDBusMessage *message,
gpointer user_data)
{
GDBusConnection *connection;
FilterData **filters;
guint n;
gboolean alive;
G_LOCK (message_bus_lock);
alive = g_hash_table_contains (alive_connections, user_data);
if (!alive)
{
G_UNLOCK (message_bus_lock);
return;
}
connection = G_DBUS_CONNECTION (user_data);
g_object_ref (connection);
G_UNLOCK (message_bus_lock);
//g_debug ("in on_worker_message_received");
g_object_ref (message);
g_dbus_message_lock (message);
//g_debug ("boo ref_count = %d %p %p", G_OBJECT (connection)->ref_count, connection, connection->worker);
/* First collect the set of callback functions */
CONNECTION_LOCK (connection);
filters = copy_filter_list (connection->filters);
CONNECTION_UNLOCK (connection);
/* then call the filters in order (without holding the lock) */
for (n = 0; filters[n]; n++)
{
message = filters[n]->filter_function (connection,
message,
TRUE,
filters[n]->user_data);
if (message == NULL)
break;
g_dbus_message_lock (message);
}
CONNECTION_LOCK (connection);
free_filter_list (filters);
CONNECTION_UNLOCK (connection);
/* Standard dispatch unless the filter ate the message - no need to
* do anything if the message was altered
*/
if (message != NULL)
{
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;
GTask *task;
SignalData *name_watcher;
reply_serial = g_dbus_message_get_reply_serial (message);
CONNECTION_LOCK (connection);
task = g_hash_table_lookup (connection->map_method_serial_to_task,
GUINT_TO_POINTER (reply_serial));
if (task != NULL)
{
/* This removes @task from @map_method_serial_to_task. */
//g_debug ("delivering reply/error for serial %d for %p", reply_serial, connection);
send_message_data_deliver_reply_unlocked (task, message);
}
else
{
//g_debug ("message reply/error for serial %d but no SendMessageData found for %p", reply_serial, connection);
}
name_watcher = g_hash_table_lookup (connection->map_method_serial_to_name_watcher,
GUINT_TO_POINTER (reply_serial));
if (name_watcher != NULL)
{
g_assert (name_watcher->watched_name != NULL);
g_assert (name_watcher->watched_name->get_name_owner_serial == reply_serial);
name_watcher_deliver_get_name_owner_reply_unlocked (name_watcher,
connection,
message);
}
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);
}
}
if (message != NULL)
g_object_unref (message);
g_object_unref (connection);
}
/* Called in GDBusWorker's thread, lock is not held */
static GDBusMessage *
on_worker_message_about_to_be_sent (GDBusWorker *worker,
GDBusMessage *message,
gpointer user_data)
{
GDBusConnection *connection;
FilterData **filters;
guint n;
gboolean alive;
G_LOCK (message_bus_lock);
alive = g_hash_table_contains (alive_connections, user_data);
if (!alive)
{
G_UNLOCK (message_bus_lock);
return message;
}
connection = G_DBUS_CONNECTION (user_data);
g_object_ref (connection);
G_UNLOCK (message_bus_lock);
//g_debug ("in on_worker_message_about_to_be_sent");
/* First collect the set of callback functions */
CONNECTION_LOCK (connection);
filters = copy_filter_list (connection->filters);
CONNECTION_UNLOCK (connection);
/* then call the filters in order (without holding the lock) */
for (n = 0; filters[n]; n++)
{
g_dbus_message_lock (message);
message = filters[n]->filter_function (connection,
message,
FALSE,
filters[n]->user_data);
if (message == NULL)
break;
}
CONNECTION_LOCK (connection);
free_filter_list (filters);
CONNECTION_UNLOCK (connection);
g_object_unref (connection);
return message;
}
/* called with connection lock held, in GDBusWorker thread
* @key, @value and @user_data are (transfer none) */
static gboolean
cancel_method_on_close (gpointer key, gpointer value, gpointer user_data)
{
GTask *task = value;
SendMessageData *data = g_task_get_task_data (task);
if (data->delivered)
return FALSE;
g_task_return_new_error_literal (task,
G_IO_ERROR,
G_IO_ERROR_CLOSED,
_("The connection is closed"));
/* Ask send_message_with_reply_cleanup not to remove the element from the
* hash table - we're in the middle of a foreach; that would be unsafe.
* Instead, return TRUE from this function so that it gets removed safely.
*/
send_message_with_reply_cleanup (task, FALSE);
return TRUE;
}
/* Called in GDBusWorker's thread - we must not block - without lock held */
static void
on_worker_closed (GDBusWorker *worker,
gboolean remote_peer_vanished,
GError *error,
gpointer user_data)
{
GDBusConnection *connection;
gboolean alive;
guint old_atomic_flags;
G_LOCK (message_bus_lock);
alive = g_hash_table_contains (alive_connections, user_data);
if (!alive)
{
G_UNLOCK (message_bus_lock);
return;
}
connection = G_DBUS_CONNECTION (user_data);
g_object_ref (connection);
G_UNLOCK (message_bus_lock);
//g_debug ("in on_worker_closed: %s", error->message);
CONNECTION_LOCK (connection);
/* Even though this is atomic, we do it inside the lock to avoid breaking
* assumptions in remove_match_rule(). We'd need the lock in a moment
* anyway, so, no loss.
*/
old_atomic_flags = g_atomic_int_or (&connection->atomic_flags, FLAG_CLOSED);
if (!(old_atomic_flags & FLAG_CLOSED))
{
g_hash_table_foreach_remove (connection->map_method_serial_to_task, cancel_method_on_close, NULL);
schedule_closed_unlocked (connection, remote_peer_vanished, error);
}
CONNECTION_UNLOCK (connection);
g_object_unref (connection);
}
/* ---------------------------------------------------------------------------------------------------- */
/* Determines the biggest set of capabilities we can support on this
* connection.
*
* Called with the init_lock held.
*/
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->stream))
ret |= G_DBUS_CAPABILITY_FLAGS_UNIX_FD_PASSING;
#endif
return ret;
}
/* Called in a user thread, lock is not held */
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->init_lock);
ret = FALSE;
/* Make this a no-op if we're already initialized (successfully or
* unsuccessfully)
*/
if ((g_atomic_int_get (&connection->atomic_flags) & FLAG_INITIALIZED))
{
ret = (connection->initialization_error == NULL);
goto out;
}
/* Because of init_lock, we can't get here twice in different threads */
g_assert (connection->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->stream.
*/
if (connection->address != NULL)
{
g_assert (connection->stream == NULL);
if ((connection->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER) ||
(connection->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS) ||
(connection->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_REQUIRE_SAME_USER))
{
g_set_error_literal (&connection->initialization_error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Unsupported flags encountered when constructing a client-side connection"));
goto out;
}
connection->stream = g_dbus_address_get_stream_sync (connection->address,
NULL, /* TODO: out_guid */
cancellable,
&connection->initialization_error);
if (connection->stream == NULL)
goto out;
}
else if (connection->stream != NULL)
{
/* nothing to do */
}
else
{
g_assert_not_reached ();
}
/* Authenticate the connection */
if (connection->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER)
{
g_assert (!(connection->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT));
g_assert (connection->guid != NULL);
connection->auth = _g_dbus_auth_new (connection->stream);
if (!_g_dbus_auth_run_server (connection->auth,
connection->authentication_observer,
connection->guid,
(connection->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS),
(connection->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_REQUIRE_SAME_USER),
get_offered_capabilities_max (connection),
&connection->capabilities,
&connection->credentials,
cancellable,
&connection->initialization_error))
goto out;
}
else if (connection->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT)
{
g_assert (!(connection->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER));
g_assert (connection->guid == NULL);
connection->auth = _g_dbus_auth_new (connection->stream);
connection->guid = _g_dbus_auth_run_client (connection->auth,
connection->authentication_observer,
connection->flags,
get_offered_capabilities_max (connection),
&connection->capabilities,
cancellable,
&connection->initialization_error);
if (connection->guid == NULL)
goto out;
}
if (connection->authentication_observer != NULL)
{
g_object_unref (connection->authentication_observer);
connection->authentication_observer = NULL;
}
//g_output_stream_flush (G_SOCKET_CONNECTION (connection->stream)
//g_debug ("haz unix fd passing powers: %d", connection->capabilities & G_DBUS_CAPABILITY_FLAGS_UNIX_FD_PASSING);
#ifdef G_OS_UNIX
/* We want all IO operations to be non-blocking since they happen in
* the worker thread which is shared by _all_ connections.
*/
if (G_IS_SOCKET_CONNECTION (connection->stream))
{
g_socket_set_blocking (g_socket_connection_get_socket (G_SOCKET_CONNECTION (connection->stream)), FALSE);
}
#endif
G_LOCK (message_bus_lock);
if (alive_connections == NULL)
alive_connections = g_hash_table_new (g_direct_hash, g_direct_equal);
g_hash_table_add (alive_connections, connection);
G_UNLOCK (message_bus_lock);
connection->worker = _g_dbus_worker_new (connection->stream,
connection->capabilities,
((connection->flags & G_DBUS_CONNECTION_FLAGS_DELAY_MESSAGE_PROCESSING) != 0),
on_worker_message_received,
on_worker_message_about_to_be_sent,
on_worker_closed,
connection);
/* if a bus connection, call org.freedesktop.DBus.Hello - this is how we're getting a name */
if (connection->flags & G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION)
{
GVariant *hello_result;
/* we could lift this restriction by adding code in gdbusprivate.c */
if (connection->flags & G_DBUS_CONNECTION_FLAGS_DELAY_MESSAGE_PROCESSING)
{
g_set_error_literal (&connection->initialization_error,
G_IO_ERROR,
G_IO_ERROR_FAILED,
"Cannot use DELAY_MESSAGE_PROCESSING with MESSAGE_BUS_CONNECTION");
goto out;
}
hello_result = g_dbus_connection_call_sync (connection,
DBUS_SERVICE_DBUS,
DBUS_PATH_DBUS,
DBUS_INTERFACE_DBUS,
"Hello",
NULL, /* parameters */
G_VARIANT_TYPE ("(s)"),
CALL_FLAGS_INITIALIZING,
-1,
NULL, /* TODO: cancellable */
&connection->initialization_error);
if (hello_result == NULL)
goto out;
g_variant_get (hello_result, "(s)", &connection->bus_unique_name);
g_variant_unref (hello_result);
//g_debug ("unique name is '%s'", connection->bus_unique_name);
}
ret = TRUE;
out:
if (!ret)
{
g_assert (connection->initialization_error != NULL);
g_propagate_error (error, g_error_copy (connection->initialization_error));
}
/* Don't cache canceled errors. Otherwise other concurrent users of the same connection
* object will be canceled as well. */
if (g_error_matches (connection->initialization_error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
{
if (connection->worker != NULL)
{
_g_dbus_worker_stop (connection->worker);
connection->worker = NULL;
if (alive_connections != NULL)
g_warn_if_fail (g_hash_table_remove (alive_connections, connection));
}
g_clear_error (&connection->initialization_error);
g_clear_object (&connection->stream);
g_clear_object (&connection->auth);
g_clear_object (&connection->credentials);
g_clear_pointer (&connection->guid, g_free);
connection->capabilities = 0;
}
else
g_atomic_int_or (&connection->atomic_flags, FLAG_INITIALIZED);
g_mutex_unlock (&connection->init_lock);
return ret;
}
static void
initable_iface_init (GInitableIface *initable_iface)
{
initable_iface->init = initable_init;
}
/* ---------------------------------------------------------------------------------------------------- */
static void
async_initable_iface_init (GAsyncInitableIface *async_initable_iface)
{
/* Use default */
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_connection_new:
* @stream: a #GIOStream
* @guid: (nullable): the GUID to use if authenticating as a server or %NULL
* @flags: flags describing how to make the connection
* @observer: (nullable): a #GDBusAuthObserver or %NULL
* @cancellable: (nullable): 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 @stream is a #GSocketConnection, then the corresponding #GSocket
* will be put into non-blocking mode.
*
* The D-Bus connection will interact with @stream from a worker thread.
* As a result, the caller should not interact with @stream after this
* method has been called, except by calling g_object_unref() on it.
*
* 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 an 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_dbus_initialize ();
g_return_if_fail (G_IS_IO_STREAM (stream));
g_return_if_fail ((flags & ~G_DBUS_CONNECTION_FLAGS_ALL) == 0);
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: (transfer full): 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: (nullable): the GUID to use if authenticating as a server or %NULL
* @flags: flags describing how to make the connection
* @observer: (nullable): a #GDBusAuthObserver or %NULL
* @cancellable: (nullable): 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 @stream is a #GSocketConnection, then the corresponding #GSocket
* will be put into non-blocking mode.
*
* The D-Bus connection will interact with @stream from a worker thread.
* As a result, the caller should not interact with @stream after this
* method has been called, except by calling g_object_unref() on it.
*
* 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: (transfer full): 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_dbus_initialize ();
g_return_val_if_fail (G_IS_IO_STREAM (stream), NULL);
g_return_val_if_fail ((flags & ~G_DBUS_CONNECTION_FLAGS_ALL) == 0, 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: (nullable): a #GDBusAuthObserver or %NULL
* @cancellable: (nullable): 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](https://dbus.freedesktop.org/doc/dbus-specification.html#addresses).
*
* 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,
* %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS or
* %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_REQUIRE_SAME_USER flags.
*
* When the operation is finished, @callback will be invoked. You can
* then call g_dbus_connection_new_for_address_finish() to get the result of
* the operation.
*
* If @observer is not %NULL it may be used to control the
* authentication process.
*
* This is an 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_dbus_initialize ();
g_return_if_fail (address != NULL);
g_return_if_fail ((flags & ~G_DBUS_CONNECTION_FLAGS_ALL) == 0);
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: (transfer full): 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: (nullable): a #GDBusAuthObserver or %NULL
* @cancellable: (nullable): 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](https://dbus.freedesktop.org/doc/dbus-specification.html#addresses).
*
* 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,
* %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS or
* %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_REQUIRE_SAME_USER 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: (transfer full): 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_dbus_initialize ();
g_return_val_if_fail (address != NULL, NULL);
g_return_val_if_fail ((flags & ~G_DBUS_CONNECTION_FLAGS_ALL) == 0, 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.
*
* Note that this function should be used with care. Most modern UNIX
* desktops tie the notion of a user session with the session bus, and expect
* all of a user's applications to quit when their bus connection goes away.
* If you are setting @exit_on_close to %FALSE for the shared session
* bus connection, you should make sure that your application exits
* when the user session ends.
*
* 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));
if (exit_on_close)
g_atomic_int_or (&connection->atomic_flags, FLAG_EXIT_ON_CLOSE);
else
g_atomic_int_and (&connection->atomic_flags, ~FLAG_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);
if (g_atomic_int_get (&connection->atomic_flags) & FLAG_EXIT_ON_CLOSE)
return TRUE;
else
return FALSE;
}
/**
* 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: (not nullable): 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->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: (nullable): 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);
/* do not use g_return_val_if_fail(), we want the memory barrier */
if (!check_initialized (connection))
return NULL;
return connection->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: (transfer none) (nullable): 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);
/* do not use g_return_val_if_fail(), we want the memory barrier */
if (!check_initialized (connection))
return NULL;
return connection->credentials;
}
/* ---------------------------------------------------------------------------------------------------- */
static guint _global_filter_id = 1; /* (atomic) */
/**
* 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 and outgoing 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. Filter functions are allowed to modify
* and even drop messages.
*
* 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.
*
* If a filter consumes an incoming message the message is not
* dispatched anywhere else - not even the standard dispatch machinery
* (that API such as g_dbus_connection_signal_subscribe() and
* g_dbus_connection_send_message_with_reply() relies on) will see the
* message. Similarly, if a filter consumes an outgoing message, the
* message will not be sent to the other peer.
*
* If @user_data_free_func is non-%NULL, it will be called (in the
* thread-default main context of the thread you are calling this
* method from) at some point after @user_data is no longer
* needed. (It is not guaranteed to be called synchronously when the
* filter is removed, and may be called after @connection has been
* destroyed.)
*
* 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);
g_return_val_if_fail (check_initialized (connection), 0);
CONNECTION_LOCK (connection);
data = g_new0 (FilterData, 1);
data->id = (guint) g_atomic_int_add (&_global_filter_id, 1); /* TODO: overflow etc. */
data->ref_count = 1;
data->filter_function = filter_function;
data->user_data = user_data;
data->user_data_free_func = user_data_free_func;
data->context = g_main_context_ref_thread_default ();
g_ptr_array_add (connection->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->filters->len; n++)
filter_data_destroy (connection->filters->pdata[n], FALSE);
}
/**
* g_dbus_connection_remove_filter:
* @connection: a #GDBusConnection
* @filter_id: an identifier obtained from g_dbus_connection_add_filter()
*
* Removes a filter.
*
* Note that since filters run in a different thread, there is a race
* condition where it is possible that the filter will be running even
* after calling g_dbus_connection_remove_filter(), so you cannot just
* free data that the filter might be using. Instead, you should pass
* a #GDestroyNotify to g_dbus_connection_add_filter(), which will be
* called when it is guaranteed that the data is no longer needed.
*
* Since: 2.26
*/
void
g_dbus_connection_remove_filter (GDBusConnection *connection,
guint filter_id)
{
guint n;
gboolean found;
FilterData *to_destroy;
g_return_if_fail (G_IS_DBUS_CONNECTION (connection));
g_return_if_fail (check_initialized (connection));
CONNECTION_LOCK (connection);
found = FALSE;
to_destroy = NULL;
for (n = 0; n < connection->filters->len; n++)
{
FilterData *data = connection->filters->pdata[n];
if (data->id == filter_id)
{
found = TRUE;
g_ptr_array_remove_index (connection->filters, n);
data->ref_count--;
if (data->ref_count == 0)
to_destroy = data;
break;
}
}
CONNECTION_UNLOCK (connection);
/* do free without holding lock */
if (to_destroy != NULL)
filter_data_destroy (to_destroy, TRUE);
else if (!found)
{
g_warning ("g_dbus_connection_remove_filter: No filter found for filter_id %d", filter_id);
}
}
/* ---------------------------------------------------------------------------------------------------- */
static gchar *
args_to_rule (const gchar *sender,
const gchar *interface_name,
const gchar *member,
const gchar *object_path,
const gchar *arg0,
GDBusSignalFlags flags)
{
GString *rule;
rule = g_string_new ("type='signal'");
if (flags & G_DBUS_SIGNAL_FLAGS_NO_MATCH_RULE)
g_string_prepend_c (rule, '-');
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)
{
if (flags & G_DBUS_SIGNAL_FLAGS_MATCH_ARG0_PATH)
g_string_append_printf (rule, ",arg0path='%s'", arg0);
else if (flags & G_DBUS_SIGNAL_FLAGS_MATCH_ARG0_NAMESPACE)
g_string_append_printf (rule, ",arg0namespace='%s'", arg0);
else
g_string_append_printf (rule, ",arg0='%s'", arg0);
}
return g_string_free (rule, FALSE);
}
static guint _global_subscriber_id = 1; /* (atomic) */
static guint _global_registration_id = 1; /* (atomic) */
static guint _global_subtree_registration_id = 1; /* (atomic) */
/* ---------------------------------------------------------------------------------------------------- */
/* Called in a user thread, lock is held */
static void
add_match_rule (GDBusConnection *connection,
const gchar *match_rule)
{
GError *error;
GDBusMessage *message;
if (match_rule[0] == '-')
return;
message = g_dbus_message_new_method_call (DBUS_SERVICE_DBUS,
DBUS_PATH_DBUS,
DBUS_INTERFACE_DBUS,
"AddMatch");
g_dbus_message_set_body (message, g_variant_new ("(s)", match_rule));
error = NULL;
if (!g_dbus_connection_send_message_unlocked (connection,
message,
G_DBUS_SEND_MESSAGE_FLAGS_NONE,
NULL,
&error))
{
g_critical ("Error while sending AddMatch() message: %s", error->message);
g_error_free (error);
}
g_object_unref (message);
}
/* ---------------------------------------------------------------------------------------------------- */
/* Called in a user thread, lock is held */
static void
remove_match_rule (GDBusConnection *connection,
const gchar *match_rule)
{
GError *error;
GDBusMessage *message;
if (match_rule[0] == '-')
return;
message = g_dbus_message_new_method_call (DBUS_SERVICE_DBUS,
DBUS_PATH_DBUS,
DBUS_INTERFACE_DBUS,
"RemoveMatch");
g_dbus_message_set_body (message, g_variant_new ("(s)", match_rule));
error = NULL;
if (!g_dbus_connection_send_message_unlocked (connection,
message,
G_DBUS_SEND_MESSAGE_FLAGS_NONE,
NULL,
&error))
{
/* If we could get G_IO_ERROR_CLOSED here, it wouldn't be reasonable to
* critical; but we're holding the lock, and our caller checked whether
* we were already closed, so we can't get that 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, DBUS_SERVICE_DBUS) == 0 &&
g_strcmp0 (signal_data->interface_name, DBUS_INTERFACE_DBUS) == 0 &&
g_strcmp0 (signal_data->object_path, DBUS_PATH_DBUS) == 0 &&
(g_strcmp0 (signal_data->member, "NameLost") == 0 ||
g_strcmp0 (signal_data->member, "NameAcquired") == 0);
}
/* ---------------------------------------------------------------------------------------------------- */
/* called in any thread, connection lock is held */
static void
add_signal_data (GDBusConnection *connection,
SignalData *signal_data,
const char *sender_unique_name)
{
GPtrArray *signal_data_array;
g_hash_table_insert (connection->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->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);
}
signal_data_array = g_hash_table_lookup (connection->map_sender_unique_name_to_signal_data_array,
sender_unique_name);
if (signal_data_array == NULL)
{
signal_data_array = g_ptr_array_new ();
g_hash_table_insert (connection->map_sender_unique_name_to_signal_data_array,
g_strdup (sender_unique_name),
signal_data_array);
}
g_ptr_array_add (signal_data_array, signal_data);
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_connection_signal_subscribe:
* @connection: a #GDBusConnection
* @sender: (nullable): sender name to match on (unique or well-known name)
* or %NULL to listen from all senders
* @interface_name: (nullable): D-Bus interface name to match on or %NULL to
* match on all interfaces
* @member: (nullable): D-Bus signal name to match on or %NULL to match on
* all signals
* @object_path: (nullable): object path to match on or %NULL to match on
* all object paths
* @arg0: (nullable): contents of first string argument to match on or %NULL
* to match on all kinds of arguments
* @flags: #GDBusSignalFlags describing how arg0 is used in subscribing to the
* signal
* @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: (nullable): function to free @user_data with when
* subscription is removed or %NULL
*
* Subscribes to signals on @connection and invokes @callback whenever
* the signal is received. Note that @callback will be invoked in the
* [thread-default main context][g-main-context-push-thread-default]
* of the thread you are calling this method from.
*
* If @connection is not a message bus connection, @sender must be
* %NULL.
*
* If @sender is a well-known name note that @callback is invoked with
* the unique name for the owner of @sender, not the well-known name
* as one would expect. This is because the message bus rewrites the
* name. As such, to avoid certain race conditions, users should be
* tracking the name owner of the well-known name and use that when
* processing the received signal.
*
* If one of %G_DBUS_SIGNAL_FLAGS_MATCH_ARG0_NAMESPACE or
* %G_DBUS_SIGNAL_FLAGS_MATCH_ARG0_PATH are given, @arg0 is
* interpreted as part of a namespace or path. The first argument
* of a signal is matched against that part as specified by D-Bus.
*
* If @user_data_free_func is non-%NULL, it will be called (in the
* thread-default main context of the thread you are calling this
* method from) at some point after @user_data is no longer
* needed. (It is not guaranteed to be called synchronously when the
* signal is unsubscribed from, and may be called after @connection
* has been destroyed.)
*
* As @callback is potentially invoked in a different thread from where it’s
* emitted, it’s possible for this to happen after
* g_dbus_connection_signal_unsubscribe() has been called in another thread.
* Due to this, @user_data should have a strong reference which is freed with
* @user_data_free_func, rather than pointing to data whose lifecycle is tied
* to the signal subscription. For example, if a #GObject is used to store the
* subscription ID from g_dbus_connection_signal_subscribe(), a strong reference
* to that #GObject must be passed to @user_data, and g_object_unref() passed to
* @user_data_free_func. You are responsible for breaking the resulting
* reference count cycle by explicitly unsubscribing from the signal when
* dropping the last external reference to the #GObject. Alternatively, a weak
* reference may be used.
*
* It is guaranteed that if you unsubscribe from a signal using
* g_dbus_connection_signal_unsubscribe() from the same thread which made the
* corresponding g_dbus_connection_signal_subscribe() call, @callback will not
* be invoked after g_dbus_connection_signal_unsubscribe() returns.
*
* The returned subscription identifier is an opaque value which is guaranteed
* to never be zero.
*
* This function can never fail.
*
* 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,
GDBusSignalFlags flags,
GDBusSignalCallback callback,
gpointer user_data,
GDestroyNotify user_data_free_func)
{
gchar *rule;
SignalData *signal_data;
SignalData *name_watcher = NULL;
SignalSubscriber *subscriber;
gboolean sender_is_its_own_owner;
const gchar *sender_unique_name;
/* 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 (sender == NULL || (g_dbus_is_name (sender) && (connection->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);
g_return_val_if_fail (check_initialized (connection), 0);
g_return_val_if_fail (!((flags & G_DBUS_SIGNAL_FLAGS_MATCH_ARG0_PATH) && (flags & G_DBUS_SIGNAL_FLAGS_MATCH_ARG0_NAMESPACE)), 0);
g_return_val_if_fail (!(arg0 == NULL && (flags & (G_DBUS_SIGNAL_FLAGS_MATCH_ARG0_PATH | G_DBUS_SIGNAL_FLAGS_MATCH_ARG0_NAMESPACE))), 0);
CONNECTION_LOCK (connection);
/* If G_DBUS_SIGNAL_FLAGS_NO_MATCH_RULE was specified, we will end up
* with a '-' character to prefix the rule (which will otherwise be
* normal).
*
* This allows us to hash the rule and do our lifecycle tracking in
* the usual way, but the '-' prevents the match rule from ever
* actually being send to the bus (either for add or remove).
*/
rule = args_to_rule (sender, interface_name, member, object_path, arg0, flags);
if (sender != NULL && (g_dbus_is_unique_name (sender) || g_strcmp0 (sender, DBUS_SERVICE_DBUS) == 0))
sender_is_its_own_owner = TRUE;
else
sender_is_its_own_owner = FALSE;
if (sender_is_its_own_owner)
sender_unique_name = sender;
else
sender_unique_name = "";
subscriber = g_new0 (SignalSubscriber, 1);
subscriber->ref_count = 1;
subscriber->callback = callback;
subscriber->user_data = user_data;
subscriber->user_data_free_func = user_data_free_func;
subscriber->id = (guint) g_atomic_int_add (&_global_subscriber_id, 1); /* TODO: overflow etc. */
subscriber->context = g_main_context_ref_thread_default ();
/* see if we've already have this rule */
signal_data = g_hash_table_lookup (connection->map_rule_to_signal_data, rule);
if (signal_data != NULL)
{
g_ptr_array_add (signal_data->subscribers, subscriber);
g_free (rule);
goto out;
}
signal_data = signal_data_new_take (g_steal_pointer (&rule),
g_strdup (sender),
g_strdup (interface_name),
g_strdup (member),
g_strdup (object_path),
g_strdup (arg0),
flags);
g_ptr_array_add (signal_data->subscribers, subscriber);
/* If subscribing to a signal from a specific sender with a well-known
* name, we must first subscribe to NameOwnerChanged signals for that
* well-known name, so that we can match the current owner of the name
* against the sender of each signal. */
if (sender != NULL && !sender_is_its_own_owner)
{
gchar *name_owner_rule = NULL;
/* We already checked that sender != NULL implies MESSAGE_BUS_CONNECTION */
g_assert (connection->flags & G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION);
name_owner_rule = args_to_rule (DBUS_SERVICE_DBUS,
DBUS_INTERFACE_DBUS,
"NameOwnerChanged",
DBUS_PATH_DBUS,
sender,
G_DBUS_SIGNAL_FLAGS_NONE);
name_watcher = g_hash_table_lookup (connection->map_rule_to_signal_data, name_owner_rule);
if (name_watcher == NULL)
{
name_watcher = signal_data_new_take (g_steal_pointer (&name_owner_rule),
g_strdup (DBUS_SERVICE_DBUS),
g_strdup (DBUS_INTERFACE_DBUS),
g_strdup ("NameOwnerChanged"),
g_strdup (DBUS_PATH_DBUS),
g_strdup (sender),
G_DBUS_SIGNAL_FLAGS_NONE);
add_signal_data (connection, name_watcher, DBUS_SERVICE_DBUS);
}
if (name_watcher->watched_name == NULL)
{
name_watcher->watched_name = watched_name_new ();
name_watcher_call_get_name_owner_unlocked (connection, name_watcher);
}
else
{
g_ref_count_inc (&name_watcher->watched_name->ref_count);
}
signal_data->shared_name_watcher = name_watcher;
g_clear_pointer (&name_owner_rule, g_free);
}
add_signal_data (connection, signal_data, sender_unique_name);
out:
g_hash_table_insert (connection->map_id_to_signal_data,
GUINT_TO_POINTER (subscriber->id),
signal_data);
CONNECTION_UNLOCK (connection);
return subscriber->id;
}
/* ---------------------------------------------------------------------------------------------------- */
/*
* Called in any thread.
* Must hold the connection lock when calling this, unless
* connection->finalizing is TRUE.
* May free signal_data, so do not dereference it after this.
*/
static void
remove_signal_data_if_unused (GDBusConnection *connection,
SignalData *signal_data)
{
const gchar *sender_unique_name;
GPtrArray *signal_data_array;
/* Cannot remove while there are still subscribers */
if (signal_data->subscribers->len != 0)
return;
/* Cannot remove while another SignalData is still using this one
* as its shared_name_watcher, which holds watched_name->ref_count > 0 */
if (signal_data->watched_name != NULL)
return;
/* Point of no return: we have committed to removing it */
if (signal_data->sender != NULL && signal_data->shared_name_watcher == NULL)
sender_unique_name = signal_data->sender;
else
sender_unique_name = "";
g_warn_if_fail (g_hash_table_remove (connection->map_rule_to_signal_data, signal_data->rule));
signal_data_array = g_hash_table_lookup (connection->map_sender_unique_name_to_signal_data_array,
sender_unique_name);
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->map_sender_unique_name_to_signal_data_array,
sender_unique_name));
}
/* remove the match rule from the bus unless NameLost or NameAcquired (see subscribe()) */
if ((connection->flags & G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION) &&
!is_signal_data_for_name_lost_or_acquired (signal_data) &&
!g_dbus_connection_is_closed (connection) &&
!connection->finalizing)
{
/* The check for g_dbus_connection_is_closed() means that
* sending the RemoveMatch message can't fail with
* G_IO_ERROR_CLOSED, because we're holding the lock,
* so on_worker_closed() can't happen between the check we just
* did, and releasing the lock later.
*/
remove_match_rule (connection, signal_data->rule);
}
if (signal_data->shared_name_watcher != NULL)
{
SignalData *name_watcher = g_steal_pointer (&signal_data->shared_name_watcher);
name_watcher_unref_watched_name (connection, name_watcher);
/* May free signal_data */
remove_signal_data_if_unused (connection, name_watcher);
}
signal_data_free (signal_data);
}
/* called in any thread */
/* must hold lock when calling this (except if connection->finalizing is TRUE)
* returns the number of removed subscribers */
static guint
unsubscribe_id_internal (GDBusConnection *connection,
guint subscription_id)
{
SignalData *signal_data;
guint n;
guint n_removed = 0;
signal_data = g_hash_table_lookup (connection->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 = signal_data->subscribers->pdata[n];
if (subscriber->id != subscription_id)
continue;
/* It’s OK to rearrange the array order using the ‘fast’ #GPtrArray
* removal functions, since we’re going to exit the loop below anyway — we
* never move on to the next element. Secondly, subscription IDs are
* guaranteed to be unique. */
g_warn_if_fail (g_hash_table_remove (connection->map_id_to_signal_data,
GUINT_TO_POINTER (subscription_id)));
n_removed++;
g_ptr_array_remove_index_fast (signal_data->subscribers, n);
/* May free signal_data */
remove_signal_data_if_unused (connection, signal_data);
goto out;
}
g_assert_not_reached ();
out:
return n_removed;
}
/**
* g_dbus_connection_signal_unsubscribe:
* @connection: a #GDBusConnection
* @subscription_id: a subscription id obtained from
* g_dbus_connection_signal_subscribe()
*
* Unsubscribes from signals.
*
* Note that there may still be D-Bus traffic to process (relating to this
* signal subscription) in the current thread-default #GMainContext after this
* function has returned. You should continue to iterate the #GMainContext
* until the #GDestroyNotify function passed to
* g_dbus_connection_signal_subscribe() is called, in order to avoid memory
* leaks through callbacks queued on the #GMainContext after it’s stopped being
* iterated.
* Alternatively, any idle source with a priority lower than %G_PRIORITY_DEFAULT
* that was scheduled after unsubscription, also indicates that all resources
* of this subscription are released.
*
* Since: 2.26
*/
void
g_dbus_connection_signal_unsubscribe (GDBusConnection *connection,
guint subscription_id)
{
guint n_subscribers_removed G_GNUC_UNUSED /* when compiling with G_DISABLE_ASSERT */;
g_return_if_fail (G_IS_DBUS_CONNECTION (connection));
g_return_if_fail (check_initialized (connection));
CONNECTION_LOCK (connection);
n_subscribers_removed = unsubscribe_id_internal (connection, subscription_id);
CONNECTION_UNLOCK (connection);
/* invariant */
g_assert (n_subscribers_removed == 0 || n_subscribers_removed == 1);
}
/* ---------------------------------------------------------------------------------------------------- */
typedef struct
{
SignalSubscriber *subscriber; /* (owned) */
GDBusMessage *message; /* (owned) */
GDBusConnection *connection;
const gchar *sender; /* (nullable) for peer-to-peer connections */
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_print ("in emit_signal_instance_in_idle_cb (id=%d sender=%s path=%s interface=%s member=%s params=%s)\n",
signal_instance->subscriber->id,
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->map_id_to_signal_data,
GUINT_TO_POINTER (signal_instance->subscriber->id)) != NULL)
has_subscription = TRUE;
CONNECTION_UNLOCK (signal_instance->connection);
if (has_subscription)
signal_instance->subscriber->callback (signal_instance->connection,
signal_instance->sender,
signal_instance->path,
signal_instance->interface,
signal_instance->member,
parameters,
signal_instance->subscriber->user_data);
g_variant_unref (parameters);
return FALSE;
}
static void
signal_instance_free (SignalInstance *signal_instance)
{
g_clear_object (&signal_instance->message);
g_object_unref (signal_instance->connection);
signal_subscriber_unref (signal_instance->subscriber);
g_free (signal_instance);
}
static gboolean
namespace_rule_matches (const gchar *namespace,
const gchar *name)
{
size_t len_namespace;
size_t len_name;
len_namespace = strlen (namespace);
len_name = strlen (name);
if (len_name < len_namespace)
return FALSE;
if (memcmp (namespace, name, len_namespace) != 0)
return FALSE;
return len_namespace == len_name || name[len_namespace] == '.';
}
static gboolean
path_rule_matches (const gchar *path_a,
const gchar *path_b)
{
size_t len_a, len_b;
len_a = strlen (path_a);
len_b = strlen (path_b);
if (len_a < len_b && (len_a == 0 || path_a[len_a - 1] != '/'))
return FALSE;
if (len_b < len_a && (len_b == 0 || path_b[len_b - 1] != '/'))
return FALSE;
return memcmp (path_a, path_b, MIN (len_a, len_b)) == 0;
}
/* called in GDBusWorker thread WITH lock held
*
* @sender is (nullable) for peer-to-peer connections */
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;
const gchar *arg0_path;
interface = NULL;
member = NULL;
path = NULL;
arg0 = NULL;
arg0_path = 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);
arg0_path = g_dbus_message_get_arg0_path (message);
/* These two are mutually exclusive through the type system. */
g_assert (arg0 == NULL || arg0_path == NULL);
#if 0
g_print ("In schedule_callbacks:\n"
" sender = '%s'\n"
" interface = '%s'\n"
" member = '%s'\n"
" path = '%s'\n"
" arg0 = '%s'\n",
sender,
interface,
member,
path,
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->shared_name_watcher != NULL)
{
/* We want signals from a specified well-known name, which means
* the signal's sender needs to be the unique name that currently
* owns that well-known name, and we will have found this
* SignalData in
* connection->map_sender_unique_name_to_signal_data_array[""]. */
const WatchedName *watched_name;
const char *current_owner;
g_assert (signal_data->sender != NULL);
/* Invariant: We never need to watch for the owner of a unique
* name, or for the owner of DBUS_SERVICE_DBUS, either of which
* is always its own owner */
g_assert (!g_dbus_is_unique_name (signal_data->sender));
g_assert (g_strcmp0 (signal_data->sender, DBUS_SERVICE_DBUS) != 0);
watched_name = signal_data->shared_name_watcher->watched_name;
g_assert (watched_name != NULL);
current_owner = watched_name->owner;
/* Skip the signal if the actual sender is not known to own
* the required name */
if (current_owner == NULL || g_strcmp0 (current_owner, sender) != 0)
continue;
}
else if (signal_data->sender != NULL)
{
/* We want signals from a unique name or o.fd.DBus... */
g_assert (g_dbus_is_unique_name (signal_data->sender)
|| g_str_equal (signal_data->sender, DBUS_SERVICE_DBUS));
/* ... which means we must have found this SignalData in
* connection->map_sender_unique_name_to_signal_data_array[signal_data->sender],
* therefore we would only have found it if the signal's
* actual sender matches the required signal_data->sender */
g_assert (g_strcmp0 (signal_data->sender, sender) == 0);
}
/* else the sender is unspecified and we will accept anything */
if (signal_data->arg0 != NULL)
{
if (signal_data->flags & G_DBUS_SIGNAL_FLAGS_MATCH_ARG0_NAMESPACE)
{
if (arg0 == NULL || !namespace_rule_matches (signal_data->arg0, arg0))
continue;
}
else if (signal_data->flags & G_DBUS_SIGNAL_FLAGS_MATCH_ARG0_PATH)
{
if ((arg0 == NULL || !path_rule_matches (signal_data->arg0, arg0)) &&
(arg0_path == NULL || !path_rule_matches (signal_data->arg0, arg0_path)))
continue;
}
else if (arg0 == NULL || !g_str_equal (signal_data->arg0, arg0))
continue;
}
if (signal_data->watched_name != NULL)
{
/* Invariant: SignalData should only have a watched_name if it
* represents the NameOwnerChanged signal */
g_assert (g_strcmp0 (sender, DBUS_SERVICE_DBUS) == 0);
g_assert (g_strcmp0 (interface, DBUS_INTERFACE_DBUS) == 0);
g_assert (g_strcmp0 (path, DBUS_PATH_DBUS) == 0);
g_assert (g_strcmp0 (member, "NameOwnerChanged") == 0);
name_watcher_deliver_name_owner_changed_unlocked (signal_data, message);
}
for (m = 0; m < signal_data->subscribers->len; m++)
{
SignalSubscriber *subscriber = signal_data->subscribers->pdata[m];
GSource *idle_source;
SignalInstance *signal_instance;
signal_instance = g_new0 (SignalInstance, 1);
signal_instance->subscriber = signal_subscriber_ref (subscriber);
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_set_static_name (idle_source, "[gio] emit_signal_instance_in_idle_cb");
g_source_attach (idle_source, subscriber->context);
g_source_unref (idle_source);
}
}
}
/* called in GDBusWorker thread with lock held */
static void
distribute_signals (GDBusConnection *connection,
GDBusMessage *message)
{
GPtrArray *signal_data_array;
const gchar *sender, *interface, *member, *path;
g_assert (g_dbus_message_get_message_type (message) == G_DBUS_MESSAGE_TYPE_SIGNAL);
sender = g_dbus_message_get_sender (message);
/* all three of these are required, but should have been validated already
* by validate_headers() in gdbusmessage.c */
interface = g_dbus_message_get_interface (message);
member = g_dbus_message_get_member (message);
path = g_dbus_message_get_path (message);
g_assert (interface != NULL);
g_assert (member != NULL);
g_assert (path != NULL);
if (G_UNLIKELY (_g_dbus_debug_signal ()))
{
_g_dbus_debug_print_lock ();
g_print ("========================================================================\n"
"GDBus-debug:Signal:\n"
" <<<< RECEIVED SIGNAL %s.%s\n"
" on object %s\n"
" sent by name %s\n",
interface, member, path,
sender != NULL ? sender : "(none)");
_g_dbus_debug_print_unlock ();
}
/* collect subscribers that match on sender */
if (sender != NULL)
{
signal_data_array = g_hash_table_lookup (connection->map_sender_unique_name_to_signal_data_array, sender);
if (signal_data_array != NULL)
schedule_callbacks (connection, signal_data_array, message, sender);
}
/* collect subscribers not matching on sender, or matching a well-known name */
signal_data_array = g_hash_table_lookup (connection->map_sender_unique_name_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;
guint n;
ids = g_array_new (FALSE, FALSE, sizeof (guint));
g_hash_table_iter_init (&iter, connection->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);
}
for (n = 0; n < ids->len; n++)
{
guint subscription_id = g_array_index (ids, guint, n);
unsubscribe_id_internal (connection, subscription_id);
}
g_array_free (ids, TRUE);
}
/* ---------------------------------------------------------------------------------------------------- */
static GDBusInterfaceVTable *
_g_dbus_interface_vtable_copy (const GDBusInterfaceVTable *vtable)
{
/* Don't waste memory by copying padding - remember to update this
* when changing struct _GDBusInterfaceVTable in gdbusconnection.h
*/
return g_memdup2 ((gconstpointer) vtable, 3 * sizeof (gpointer));
}
static void
_g_dbus_interface_vtable_free (GDBusInterfaceVTable *vtable)
{
g_free (vtable);
}
/* ---------------------------------------------------------------------------------------------------- */
static GDBusSubtreeVTable *
_g_dbus_subtree_vtable_copy (const GDBusSubtreeVTable *vtable)
{
/* Don't waste memory by copying padding - remember to update this
* when changing struct _GDBusSubtreeVTable in gdbusconnection.h
*/
return g_memdup2 ((gconstpointer) vtable, 3 * sizeof (gpointer));
}
static void
_g_dbus_subtree_vtable_free (GDBusSubtreeVTable *vtable)
{
g_free (vtable);
}
/* ---------------------------------------------------------------------------------------------------- */
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;
gint refcount; /* (atomic) */
guint id;
gchar *interface_name; /* (owned) */
GDBusInterfaceVTable *vtable; /* (owned) */
GDBusInterfaceInfo *interface_info; /* (owned) */
GMainContext *context; /* (owned) */
gpointer user_data;
GDestroyNotify user_data_free_func;
} ExportedInterface;
static ExportedInterface *
exported_interface_ref (ExportedInterface *ei)
{
g_atomic_int_inc (&ei->refcount);
return ei;
}
/* May be called with lock held */
static void
exported_interface_unref (ExportedInterface *ei)
{
if (!g_atomic_int_dec_and_test (&ei->refcount))
return;
g_dbus_interface_info_cache_release (ei->interface_info);
g_dbus_interface_info_unref ((GDBusInterfaceInfo *) ei->interface_info);
/* All uses of ei->vtable from callbacks scheduled in idle functions must
* have completed by this call_destroy_notify() call, as language bindings
* may destroy function closures in this callback. */
call_destroy_notify (ei->context,
ei->user_data_free_func,
ei->user_data);
g_main_context_unref (ei->context);
g_free (ei->interface_name);
_g_dbus_interface_vtable_free (ei->vtable);
g_free (ei);
}
struct ExportedSubtree
{
gint refcount; /* (atomic) */
guint id;
gchar *object_path; /* (owned) */
GDBusConnection *connection; /* (unowned) */
GDBusSubtreeVTable *vtable; /* (owned) */
GDBusSubtreeFlags flags;
GMainContext *context; /* (owned) */
gpointer user_data;
GDestroyNotify user_data_free_func;
};
static ExportedSubtree *
exported_subtree_ref (ExportedSubtree *es)
{
g_atomic_int_inc (&es->refcount);
return es;
}
/* May be called with lock held */
static void
exported_subtree_unref (ExportedSubtree *es)
{
if (!g_atomic_int_dec_and_test (&es->refcount))
return;
/* All uses of es->vtable from callbacks scheduled in idle functions must
* have completed by this call_destroy_notify() call, as language bindings
* may destroy function closures in this callback. */
call_destroy_notify (es->context,
es->user_data_free_func,
es->user_data);
g_main_context_unref (es->context);
_g_dbus_subtree_vtable_free (es->vtable);
g_free (es->object_path);
g_free (es);
}
/* ---------------------------------------------------------------------------------------------------- */
/* Convenience function to check if @registration_id (if not zero) or
* @subtree_registration_id (if not zero) has been unregistered. If
* so, returns %TRUE.
*
* If not, sets @out_ei and/or @out_es to a strong reference to the relevant
* #ExportedInterface/#ExportedSubtree and returns %FALSE.
*
* May be called by any thread. Caller must *not* hold lock.
*/
static gboolean
has_object_been_unregistered (GDBusConnection *connection,
guint registration_id,
ExportedInterface **out_ei,
guint subtree_registration_id,
ExportedSubtree **out_es)
{
gboolean ret;
ExportedInterface *ei = NULL;
gpointer es = NULL;
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
ret = FALSE;
CONNECTION_LOCK (connection);
if (registration_id != 0)
{
ei = g_hash_table_lookup (connection->map_id_to_ei, GUINT_TO_POINTER (registration_id));
if (ei == NULL)
ret = TRUE;
else if (out_ei != NULL)
*out_ei = exported_interface_ref (ei);
}
if (subtree_registration_id != 0)
{
es = g_hash_table_lookup (connection->map_id_to_es, GUINT_TO_POINTER (subtree_registration_id));
if (es == NULL)
ret = TRUE;
else if (out_es != NULL)
*out_es = exported_subtree_ref (es);
}
CONNECTION_UNLOCK (connection);
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
typedef struct
{
GDBusConnection *connection;
GDBusMessage *message; /* (owned) */
gpointer user_data;
const gchar *property_name;
const GDBusInterfaceVTable *vtable;
GDBusInterfaceInfo *interface_info;
const GDBusPropertyInfo *property_info;
guint registration_id;
guint subtree_registration_id;
} PropertyData;
static void
property_data_free (PropertyData *data)
{
g_object_unref (data->connection);
g_clear_object (&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;
ExportedInterface *ei = NULL;
ExportedSubtree *es = NULL;
if (has_object_been_unregistered (data->connection,
data->registration_id,
&ei,
data->subtree_registration_id,
&es))
{
reply = g_dbus_message_new_method_error (data->message,
DBUS_ERROR_UNKNOWN_METHOD,
/* Translators: The first placeholder is a D-Bus interface,
* the second is the path of an object. */
_("No such interface “%s” on object at path %s"),
DBUS_INTERFACE_PROPERTIES,
g_dbus_message_get_path (data->message));
g_dbus_connection_send_message (data->connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
g_object_unref (reply);
goto out;
}
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_take_ref (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, G_DBUS_SEND_MESSAGE_FLAGS_NONE, 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, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
g_free (dbus_error_name);
g_error_free (error);
g_object_unref (reply);
}
out:
g_clear_pointer (&ei, exported_interface_unref);
g_clear_pointer (&es, exported_subtree_unref);
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);
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);
}
g_assert (reply != NULL);
g_dbus_connection_send_message (data->connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
g_object_unref (reply);
g_variant_unref (value);
return FALSE;
}
/* called in any thread with connection's lock held */
static gboolean
validate_and_maybe_schedule_property_getset (GDBusConnection *connection,
GDBusMessage *message,
guint registration_id,
guint subtree_registration_id,
gboolean is_get,
GDBusInterfaceInfo *interface_info,
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 (vtable == NULL)
goto out;
/* Check that the property exists - if not fail with DBUS_ERROR_INVALID_ARGS
*/
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 (interface_info, property_name);
if (property_info == NULL)
{
reply = g_dbus_message_new_method_error (message,
DBUS_ERROR_INVALID_ARGS,
_("No such property “%s”"),
property_name);
g_dbus_connection_send_message_unlocked (connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, 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,
DBUS_ERROR_INVALID_ARGS,
_("Property “%s” is not readable"),
property_name);
g_dbus_connection_send_message_unlocked (connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, 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,
DBUS_ERROR_INVALID_ARGS,
_("Property “%s” is not writable"),
property_name);
g_dbus_connection_send_message_unlocked (connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
g_object_unref (reply);
handled = TRUE;
goto out;
}
if (!is_get)
{
GVariant *value;
/* Fail with DBUS_ERROR_INVALID_ARGS if the type
* of the given value is wrong
*/
g_variant_get_child (g_dbus_message_get_body (message), 2, "v", &value);
if (g_strcmp0 (g_variant_get_type_string (value), property_info->signature) != 0)
{
reply = g_dbus_message_new_method_error (message,
DBUS_ERROR_INVALID_ARGS,
_("Error setting property “%s”: Expected type “%s” but got “%s”"),
property_name, property_info->signature,
g_variant_get_type_string (value));
g_dbus_connection_send_message_unlocked (connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
g_variant_unref (value);
g_object_unref (reply);
handled = TRUE;
goto out;
}
g_variant_unref (value);
}
/* If the vtable pointer for get_property() resp. set_property() is
* NULL then dispatch the call via the method_call() handler.
*/
if (is_get)
{
if (vtable->get_property == NULL)
{
schedule_method_call (connection, message, registration_id, subtree_registration_id,
interface_info, NULL, property_info, g_dbus_message_get_body (message),
vtable, main_context, user_data);
handled = TRUE;
goto out;
}
}
else
{
if (vtable->set_property == NULL)
{
schedule_method_call (connection, message, registration_id, subtree_registration_id,
interface_info, NULL, property_info, g_dbus_message_get_body (message),
vtable, main_context, user_data);
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 = interface_info;
property_data->property_info = property_info;
property_data->registration_id = registration_id;
property_data->subtree_registration_id = subtree_registration_id;
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);
if (is_get)
g_source_set_static_name (idle_source, "[gio] invoke_get_property_in_idle_cb");
else
g_source_set_static_name (idle_source, "[gio] invoke_set_property_in_idle_cb");
g_source_attach (idle_source, main_context);
g_source_unref (idle_source);
handled = TRUE;
out:
return handled;
}
/* called in GDBusWorker thread with connection's 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 DBUS_ERROR_INVALID_ARGS 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,
DBUS_ERROR_INVALID_ARGS,
_("No such interface “%s”"),
interface_name);
g_dbus_connection_send_message_unlocked (eo->connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
g_object_unref (reply);
handled = TRUE;
goto out;
}
handled = validate_and_maybe_schedule_property_getset (eo->connection,
message,
ei->id,
0,
is_get,
ei->interface_info,
ei->vtable,
ei->context,
ei->user_data);
out:
return handled;
}
/* ---------------------------------------------------------------------------------------------------- */
typedef struct
{
GDBusConnection *connection;
GDBusMessage *message; /* (owned) */
gpointer user_data;
const GDBusInterfaceVTable *vtable;
GDBusInterfaceInfo *interface_info;
guint registration_id;
guint subtree_registration_id;
} PropertyGetAllData;
static void
property_get_all_data_free (PropertyGetAllData *data)
{
g_object_unref (data->connection);
g_clear_object (&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;
GDBusMessage *reply;
guint n;
ExportedInterface *ei = NULL;
ExportedSubtree *es = NULL;
if (has_object_been_unregistered (data->connection,
data->registration_id,
&ei,
data->subtree_registration_id,
&es))
{
reply = g_dbus_message_new_method_error (data->message,
DBUS_ERROR_UNKNOWN_METHOD,
_("No such interface “%s” on object at path %s"),
DBUS_INTERFACE_PROPERTIES,
g_dbus_message_get_path (data->message));
g_dbus_connection_send_message (data->connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
g_object_unref (reply);
goto out;
}
/* 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.
*/
g_variant_builder_init_static (&builder, G_VARIANT_TYPE ("(a{sv})"));
g_variant_builder_open (&builder, 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_take_ref (value);
g_variant_builder_add (&builder,
"{sv}",
property_info->name,
value);
g_variant_unref (value);
}
g_variant_builder_close (&builder);
reply = g_dbus_message_new_method_reply (data->message);
g_dbus_message_set_body (reply, g_variant_builder_end (&builder));
g_dbus_connection_send_message (data->connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
g_object_unref (reply);
out:
g_clear_pointer (&ei, exported_interface_unref);
g_clear_pointer (&es, exported_subtree_unref);
return FALSE;
}
static gboolean
interface_has_readable_properties (GDBusInterfaceInfo *interface_info)
{
gint i;
if (!interface_info->properties)
return FALSE;
for (i = 0; interface_info->properties[i]; i++)
if (interface_info->properties[i]->flags & G_DBUS_PROPERTY_INFO_FLAGS_READABLE)
return TRUE;
return FALSE;
}
/* called in any thread with connection's lock held */
static gboolean
validate_and_maybe_schedule_property_get_all (GDBusConnection *connection,
GDBusMessage *message,
guint registration_id,
guint subtree_registration_id,
GDBusInterfaceInfo *interface_info,
const GDBusInterfaceVTable *vtable,
GMainContext *main_context,
gpointer user_data)
{
gboolean handled;
GSource *idle_source;
PropertyGetAllData *property_get_all_data;
handled = FALSE;
if (vtable == NULL)
goto out;
/* If the vtable pointer for get_property() is NULL but we have a
* non-zero number of readable properties, then dispatch the call via
* the method_call() handler.
*/
if (vtable->get_property == NULL && interface_has_readable_properties (interface_info))
{
schedule_method_call (connection, message, registration_id, subtree_registration_id,
interface_info, NULL, NULL, g_dbus_message_get_body (message),
vtable, main_context, user_data);
handled = TRUE;
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 = interface_info;
property_get_all_data->registration_id = registration_id;
property_get_all_data->subtree_registration_id = subtree_registration_id;
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_set_static_name (idle_source, "[gio] invoke_get_all_properties_in_idle_cb");
g_source_attach (idle_source, main_context);
g_source_unref (idle_source);
handled = TRUE;
out:
return handled;
}
/* called in GDBusWorker thread with connection's 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 DBUS_ERROR_INVALID_ARGS 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,
DBUS_ERROR_INVALID_ARGS,
_("No such interface “%s”"),
interface_name);
g_dbus_connection_send_message_unlocked (eo->connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
g_object_unref (reply);
handled = TRUE;
goto out;
}
handled = validate_and_maybe_schedule_property_get_all (eo->connection,
message,
ei->id,
0,
ei->interface_info,
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_properties_interface[] =
" <interface name=\"" DBUS_INTERFACE_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";
static const gchar introspect_introspectable_interface[] =
" <interface name=\"" DBUS_INTERFACE_INTROSPECTABLE "\">\n"
" <method name=\"Introspect\">\n"
" <arg type=\"s\" name=\"xml_data\" direction=\"out\"/>\n"
" </method>\n"
" </interface>\n"
" <interface name=\"" DBUS_INTERFACE_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
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 && object_path[path_len-1] == '/')
{
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_contains (set, s))
g_hash_table_add (set, s);
else
g_free (s);
}
}
/* TODO: we want a nicer public interface for this */
/* called in any thread with connection's lock held */
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;
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->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->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_hash_table_steal_all_keys (set);
g_hash_table_unref (set);
g_ptr_array_add (p, NULL);
ret = (gchar **) g_ptr_array_free (p, FALSE);
return ret;
}
/* called in any thread with connection's lock not held */
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 GDBusWorker thread with connection's 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_properties_interface) +
sizeof (introspect_introspectable_interface) +
sizeof (introspect_tail));
introspect_append_header (s);
if (!g_hash_table_lookup (eo->map_if_name_to_ei,
DBUS_INTERFACE_PROPERTIES))
g_string_append (s, introspect_properties_interface);
if (!g_hash_table_lookup (eo->map_if_name_to_ei,
DBUS_INTERFACE_INTROSPECTABLE))
g_string_append (s, introspect_introspectable_interface);
/* 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->interface_info, 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, G_DBUS_SEND_MESSAGE_FLAGS_NONE, 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;
guint registration_id;
guint subtree_registration_id;
ExportedInterface *ei = NULL;
ExportedSubtree *es = NULL;
registration_id = GPOINTER_TO_UINT (g_object_get_data (G_OBJECT (invocation), "g-dbus-registration-id"));
subtree_registration_id = GPOINTER_TO_UINT (g_object_get_data (G_OBJECT (invocation), "g-dbus-subtree-registration-id"));
if (has_object_been_unregistered (g_dbus_method_invocation_get_connection (invocation),
registration_id,
&ei,
subtree_registration_id,
&es))
{
GDBusMessage *reply;
reply = g_dbus_message_new_method_error (g_dbus_method_invocation_get_message (invocation),
DBUS_ERROR_UNKNOWN_METHOD,
_("No such interface “%s” on object at path %s"),
g_dbus_method_invocation_get_interface_name (invocation),
g_dbus_method_invocation_get_object_path (invocation));
g_dbus_connection_send_message (g_dbus_method_invocation_get_connection (invocation), reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
g_object_unref (reply);
goto out;
}
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));
out:
g_clear_pointer (&ei, exported_interface_unref);
g_clear_pointer (&es, exported_subtree_unref);
return FALSE;
}
/* called in GDBusWorker thread with connection's lock held */
static void
schedule_method_call (GDBusConnection *connection,
GDBusMessage *message,
guint registration_id,
guint subtree_registration_id,
const GDBusInterfaceInfo *interface_info,
const GDBusMethodInfo *method_info,
const GDBusPropertyInfo *property_info,
GVariant *parameters,
const GDBusInterfaceVTable *vtable,
GMainContext *main_context,
gpointer user_data)
{
GDBusMethodInvocation *invocation;
GSource *idle_source;
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,
property_info,
connection,
message,
parameters,
user_data);
/* TODO: would be nicer with a real MethodData like we already
* have PropertyData and PropertyGetAllData... */
g_object_set_data (G_OBJECT (invocation), "g-dbus-interface-vtable", (gpointer) vtable);
g_object_set_data (G_OBJECT (invocation), "g-dbus-registration-id", GUINT_TO_POINTER (registration_id));
g_object_set_data (G_OBJECT (invocation), "g-dbus-subtree-registration-id", GUINT_TO_POINTER (subtree_registration_id));
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,
g_steal_pointer (&invocation),
g_object_unref);
g_source_set_static_name (idle_source, "[gio, " __FILE__ "] call_in_idle_cb");
g_source_attach (idle_source, main_context);
g_source_unref (idle_source);
}
/* called in GDBusWorker thread with connection's lock held */
static gboolean
validate_and_maybe_schedule_method_call (GDBusConnection *connection,
GDBusMessage *message,
guint registration_id,
guint subtree_registration_id,
GDBusInterfaceInfo *interface_info,
const GDBusInterfaceVTable *vtable,
GMainContext *main_context,
gpointer user_data)
{
GDBusMethodInfo *method_info;
GDBusMessage *reply;
GVariant *parameters;
gboolean handled;
GVariantType *in_type;
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 (interface_info, g_dbus_message_get_member (message));
/* if the method doesn't exist, return the DBUS_ERROR_UNKNOWN_METHOD
* error to the caller
*/
if (method_info == NULL)
{
reply = g_dbus_message_new_method_error (message,
DBUS_ERROR_UNKNOWN_METHOD,
_("No such method “%s”"),
g_dbus_message_get_member (message));
g_dbus_connection_send_message_unlocked (connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
g_object_unref (reply);
handled = TRUE;
goto out;
}
parameters = g_dbus_message_get_body (message);
if (parameters == NULL)
{
parameters = g_variant_new ("()");
g_variant_ref_sink (parameters);
}
else
{
g_variant_ref (parameters);
}
/* Check that the incoming args are of the right type - if they are not, return
* the DBUS_ERROR_INVALID_ARGS error to the caller
*/
in_type = _g_dbus_compute_complete_signature (method_info->in_args);
if (!g_variant_is_of_type (parameters, in_type))
{
gchar *type_string;
type_string = g_variant_type_dup_string (in_type);
reply = g_dbus_message_new_method_error (message,
DBUS_ERROR_INVALID_ARGS,
_("Type of message, “%s”, does not match expected type “%s”"),
g_variant_get_type_string (parameters),
type_string);
g_dbus_connection_send_message_unlocked (connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
g_variant_type_free (in_type);
g_variant_unref (parameters);
g_object_unref (reply);
g_free (type_string);
handled = TRUE;
goto out;
}
g_variant_type_free (in_type);
/* schedule the call in idle */
schedule_method_call (connection, message, registration_id, subtree_registration_id,
interface_info, method_info, NULL, parameters,
vtable, main_context, user_data);
g_variant_unref (parameters);
handled = TRUE;
out:
return handled;
}
/* ---------------------------------------------------------------------------------------------------- */
/* called in GDBusWorker thread with connection's lock held */
static gboolean
obj_message_func (GDBusConnection *connection,
ExportedObject *eo,
GDBusMessage *message,
gboolean *object_found)
{
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->id,
0,
ei->interface_info,
ei->vtable,
ei->context,
ei->user_data);
goto out;
}
else
{
*object_found = TRUE;
}
}
if (g_strcmp0 (interface_name, DBUS_INTERFACE_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, DBUS_INTERFACE_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, DBUS_INTERFACE_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, DBUS_INTERFACE_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
* @interface_info: introspection data for the interface
* @vtable: (nullable): a #GDBusInterfaceVTable to call into or %NULL
* @user_data: (nullable): 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 @interface_info.
*
* Calls to functions in @vtable (and @user_data_free_func) will happen
* in the
* [thread-default main context][g-main-context-push-thread-default]
* 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 @interface_info - if a remote caller passes
* incorrect values, the `org.freedesktop.DBus.Error.InvalidArgs`
* is returned to the remote caller.
*
* Additionally, if the remote caller attempts to invoke methods or
* access properties not mentioned in @interface_info the
* `org.freedesktop.DBus.Error.UnknownMethod` resp.
* `org.freedesktop.DBus.Error.InvalidArgs` 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 can implement org.freedesktop.DBus.Properties
* yourself, e.g. to handle getting and setting of properties asynchronously.
*
* Note that the reference count on @interface_info will be
* incremented by 1 (unless allocated statically, e.g. if the
* reference count is -1, see g_dbus_interface_info_ref()) for as long
* as the object is exported. Also note that @vtable will be copied.
*
* See this [server][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,
GDBusInterfaceInfo *interface_info,
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 (object_path != NULL && g_variant_is_object_path (object_path), 0);
g_return_val_if_fail (interface_info != NULL, 0);
g_return_val_if_fail (g_dbus_is_interface_name (interface_info->name), 0);
g_return_val_if_fail (error == NULL || *error == NULL, 0);
g_return_val_if_fail (check_initialized (connection), 0);
ret = 0;
CONNECTION_LOCK (connection);
eo = g_hash_table_lookup (connection->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_unref);
g_hash_table_insert (connection->map_object_path_to_eo, eo->object_path, eo);
}
ei = g_hash_table_lookup (eo->map_if_name_to_ei, interface_info->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"),
interface_info->name,
object_path);
goto out;
}
ei = g_new0 (ExportedInterface, 1);
ei->refcount = 1;
ei->id = (guint) g_atomic_int_add (&_global_registration_id, 1); /* TODO: overflow etc. */
ei->eo = eo;
ei->user_data = user_data;
ei->user_data_free_func = user_data_free_func;
ei->vtable = _g_dbus_interface_vtable_copy (vtable);
ei->interface_info = g_dbus_interface_info_ref (interface_info);
g_dbus_interface_info_cache_build (ei->interface_info);
ei->interface_name = g_strdup (interface_info->name);
ei->context = g_main_context_ref_thread_default ();
g_hash_table_insert (eo->map_if_name_to_ei,
(gpointer) ei->interface_name,
ei);
g_hash_table_insert (connection->map_id_to_ei,
GUINT_TO_POINTER (ei->id),
ei);
ret = ei->id;
out:
CONNECTION_UNLOCK (connection);
if (ret == 0 && user_data_free_func != NULL)
user_data_free_func (user_data);
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);
g_return_val_if_fail (check_initialized (connection), FALSE);
ret = FALSE;
CONNECTION_LOCK (connection);
ei = g_hash_table_lookup (connection->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->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->map_object_path_to_eo,
eo->object_path));
ret = TRUE;
out:
CONNECTION_UNLOCK (connection);
return ret;
}
typedef struct {
GClosure *method_call_closure;
GClosure *get_property_closure;
GClosure *set_property_closure;
} RegisterObjectData;
static RegisterObjectData *
register_object_data_new (GClosure *method_call_closure,
GClosure *get_property_closure,
GClosure *set_property_closure)
{
RegisterObjectData *data;
data = g_new0 (RegisterObjectData, 1);
if (method_call_closure != NULL)
{
data->method_call_closure = g_closure_ref (method_call_closure);
g_closure_sink (method_call_closure);
if (G_CLOSURE_NEEDS_MARSHAL (method_call_closure))
g_closure_set_marshal (method_call_closure, g_cclosure_marshal_generic);
}
if (get_property_closure != NULL)
{
data->get_property_closure = g_closure_ref (get_property_closure);
g_closure_sink (get_property_closure);
if (G_CLOSURE_NEEDS_MARSHAL (get_property_closure))
g_closure_set_marshal (get_property_closure, g_cclosure_marshal_generic);
}
if (set_property_closure != NULL)
{
data->set_property_closure = g_closure_ref (set_property_closure);
g_closure_sink (set_property_closure);
if (G_CLOSURE_NEEDS_MARSHAL (set_property_closure))
g_closure_set_marshal (set_property_closure, g_cclosure_marshal_generic);
}
return data;
}
static void
register_object_free_func (gpointer user_data)
{
RegisterObjectData *data = user_data;
g_clear_pointer (&data->method_call_closure, g_closure_unref);
g_clear_pointer (&data->get_property_closure, g_closure_unref);
g_clear_pointer (&data->set_property_closure, g_closure_unref);
g_free (data);
}
static void
register_with_closures_on_method_call (GDBusConnection *connection,
const gchar *sender,
const gchar *object_path,
const gchar *interface_name,
const gchar *method_name,
GVariant *parameters,
GDBusMethodInvocation *invocation,
gpointer user_data)
{
RegisterObjectData *data = user_data;
GValue params[] = { G_VALUE_INIT, G_VALUE_INIT, G_VALUE_INIT, G_VALUE_INIT, G_VALUE_INIT, G_VALUE_INIT, G_VALUE_INIT };
g_value_init (&params[0], G_TYPE_DBUS_CONNECTION);
g_value_set_object (&params[0], connection);
g_value_init (&params[1], G_TYPE_STRING);
g_value_set_string (&params[1], sender);
g_value_init (&params[2], G_TYPE_STRING);
g_value_set_string (&params[2], object_path);
g_value_init (&params[3], G_TYPE_STRING);
g_value_set_string (&params[3], interface_name);
g_value_init (&params[4], G_TYPE_STRING);
g_value_set_string (&params[4], method_name);
g_value_init (&params[5], G_TYPE_VARIANT);
g_value_set_variant (&params[5], parameters);
g_value_init (&params[6], G_TYPE_DBUS_METHOD_INVOCATION);
/* NOTE: This is deliberately *not* g_value_take_object(). A reference to
* `invocation` is transferred in to this function, and it needs to be
* transferred onwards to the `g_dbus_method_invocation_return_*()` method
* call which must eventually happen (either in the closure function, or in
* a delayed consequence from it). Changing this will break API. */
g_value_set_object (&params[6], invocation);
g_closure_invoke (data->method_call_closure, NULL, G_N_ELEMENTS (params), params, NULL);
g_value_unset (params + 0);
g_value_unset (params + 1);
g_value_unset (params + 2);
g_value_unset (params + 3);
g_value_unset (params + 4);
g_value_unset (params + 5);
g_value_unset (params + 6);
}
static GVariant *
register_with_closures_on_get_property (GDBusConnection *connection,
const gchar *sender,
const gchar *object_path,
const gchar *interface_name,
const gchar *property_name,
GError **error,
gpointer user_data)
{
RegisterObjectData *data = user_data;
GValue params[] = { G_VALUE_INIT, G_VALUE_INIT, G_VALUE_INIT, G_VALUE_INIT, G_VALUE_INIT };
GValue result_value = G_VALUE_INIT;
GVariant *result;
g_value_init (&params[0], G_TYPE_DBUS_CONNECTION);
g_value_set_object (&params[0], connection);
g_value_init (&params[1], G_TYPE_STRING);
g_value_set_string (&params[1], sender);
g_value_init (&params[2], G_TYPE_STRING);
g_value_set_string (&params[2], object_path);
g_value_init (&params[3], G_TYPE_STRING);
g_value_set_string (&params[3], interface_name);
g_value_init (&params[4], G_TYPE_STRING);
g_value_set_string (&params[4], property_name);
g_value_init (&result_value, G_TYPE_VARIANT);
g_closure_invoke (data->get_property_closure, &result_value, G_N_ELEMENTS (params), params, NULL);
result = g_value_get_variant (&result_value);
if (result)
g_variant_ref (result);
g_value_unset (params + 0);
g_value_unset (params + 1);
g_value_unset (params + 2);
g_value_unset (params + 3);
g_value_unset (params + 4);
g_value_unset (&result_value);
if (!result)
g_set_error (error, G_DBUS_ERROR, G_DBUS_ERROR_FAILED,
_("Unable to retrieve property %s.%s"),
interface_name, property_name);
return result;
}
static gboolean
register_with_closures_on_set_property (GDBusConnection *connection,
const gchar *sender,
const gchar *object_path,
const gchar *interface_name,
const gchar *property_name,
GVariant *value,
GError **error,
gpointer user_data)
{
RegisterObjectData *data = user_data;
GValue params[] = { G_VALUE_INIT, G_VALUE_INIT, G_VALUE_INIT, G_VALUE_INIT, G_VALUE_INIT, G_VALUE_INIT };
GValue result_value = G_VALUE_INIT;
gboolean result;
g_value_init (&params[0], G_TYPE_DBUS_CONNECTION);
g_value_set_object (&params[0], connection);
g_value_init (&params[1], G_TYPE_STRING);
g_value_set_string (&params[1], sender);
g_value_init (&params[2], G_TYPE_STRING);
g_value_set_string (&params[2], object_path);
g_value_init (&params[3], G_TYPE_STRING);
g_value_set_string (&params[3], interface_name);
g_value_init (&params[4], G_TYPE_STRING);
g_value_set_string (&params[4], property_name);
g_value_init (&params[5], G_TYPE_VARIANT);
g_value_set_variant (&params[5], value);
g_value_init (&result_value, G_TYPE_BOOLEAN);
g_closure_invoke (data->set_property_closure, &result_value, G_N_ELEMENTS (params), params, NULL);
result = g_value_get_boolean (&result_value);
g_value_unset (params + 0);
g_value_unset (params + 1);
g_value_unset (params + 2);
g_value_unset (params + 3);
g_value_unset (params + 4);
g_value_unset (params + 5);
g_value_unset (&result_value);
if (!result)
g_set_error (error,
G_DBUS_ERROR, G_DBUS_ERROR_FAILED,
_("Unable to set property %s.%s"),
interface_name, property_name);
return result;
}
/**
* g_dbus_connection_register_object_with_closures: (rename-to g_dbus_connection_register_object)
* @connection: A #GDBusConnection.
* @object_path: The object path to register at.
* @interface_info: Introspection data for the interface.
* @method_call_closure: (nullable): #GClosure for handling incoming method calls.
* @get_property_closure: (nullable): #GClosure for getting a property.
* @set_property_closure: (nullable): #GClosure for setting a property.
* @error: Return location for error or %NULL.
*
* Version of g_dbus_connection_register_object() using closures instead of a
* #GDBusInterfaceVTable for easier binding in other languages.
*
* Note that the reference counting semantics of the function wrapped by
* @method_call_closure are the same as those of
* [callback@Gio.DBusInterfaceMethodCallFunc]: ownership of a reference to the
* [class@Gio.DBusMethodInvocation] is transferred to the function.
*
* Returns: 0 if @error is set, otherwise a registration ID (never 0)
* that can be used with g_dbus_connection_unregister_object() .
*
* Since: 2.46
*/
guint
g_dbus_connection_register_object_with_closures (GDBusConnection *connection,
const gchar *object_path,
GDBusInterfaceInfo *interface_info,
GClosure *method_call_closure,
GClosure *get_property_closure,
GClosure *set_property_closure,
GError **error)
{
RegisterObjectData *data;
GDBusInterfaceVTable vtable =
{
method_call_closure != NULL ? register_with_closures_on_method_call : NULL,
get_property_closure != NULL ? register_with_closures_on_get_property : NULL,
set_property_closure != NULL ? register_with_closures_on_set_property : NULL,
{ 0 }
};
data = register_object_data_new (method_call_closure, get_property_closure, set_property_closure);
return g_dbus_connection_register_object (connection,
object_path,
interface_info,
&vtable,
g_steal_pointer (&data),
register_object_free_func,
error);
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_connection_emit_signal:
* @connection: a #GDBusConnection
* @destination_bus_name: (nullable): 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: (nullable): 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
* (%G_IO_ERROR_INVALID_ARGUMENT), or if @connection has been closed
* (%G_IO_ERROR_CLOSED).
*
* 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);
g_return_val_if_fail (check_initialized (connection), FALSE);
if (G_UNLIKELY (_g_dbus_debug_emission ()))
{
_g_dbus_debug_print_lock ();
g_print ("========================================================================\n"
"GDBus-debug:Emission:\n"
" >>>> SIGNAL EMISSION %s.%s()\n"
" on object %s\n"
" destination %s\n",
interface_name, signal_name,
object_path,
destination_bus_name != NULL ? destination_bus_name : "(none)");
_g_dbus_debug_print_unlock ();
}
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, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, error);
g_object_unref (message);
return ret;
}
static void
add_call_flags (GDBusMessage *message,
GDBusCallFlags flags)
{
GDBusMessageFlags msg_flags = 0;
if (flags & G_DBUS_CALL_FLAGS_NO_AUTO_START)
msg_flags |= G_DBUS_MESSAGE_FLAGS_NO_AUTO_START;
if (flags & G_DBUS_CALL_FLAGS_ALLOW_INTERACTIVE_AUTHORIZATION)
msg_flags |= G_DBUS_MESSAGE_FLAGS_ALLOW_INTERACTIVE_AUTHORIZATION;
if (msg_flags)
g_dbus_message_set_flags (message, msg_flags);
}
static GVariant *
decode_method_reply (GDBusMessage *reply,
const gchar *method_name,
const GVariantType *reply_type,
GUnixFDList **out_fd_list,
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);
}
if (!g_variant_is_of_type (result, reply_type))
{
gchar *type_string = g_variant_type_dup_string (reply_type);
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_INVALID_ARGUMENT,
_("Method “%s” returned type “%s”, but expected “%s”"),
method_name, g_variant_get_type_string (result), type_string);
g_variant_unref (result);
g_free (type_string);
result = NULL;
}
#ifdef G_OS_UNIX
if (result != NULL)
{
if (out_fd_list != NULL)
{
*out_fd_list = g_dbus_message_get_unix_fd_list (reply);
if (*out_fd_list != NULL)
g_object_ref (*out_fd_list);
}
}
#endif
break;
case G_DBUS_MESSAGE_TYPE_ERROR:
g_dbus_message_to_gerror (reply, error);
break;
default:
g_assert_not_reached ();
break;
}
return result;
}
typedef struct
{
GVariantType *reply_type;
gchar *method_name; /* for error message */
GUnixFDList *fd_list;
} CallState;
static void
call_state_free (CallState *state)
{
g_variant_type_free (state->reply_type);
g_free (state->method_name);
if (state->fd_list != NULL)
g_object_unref (state->fd_list);
g_slice_free (CallState, state);
}
/* called in any thread, with the connection's lock not held */
static void
g_dbus_connection_call_done (GObject *source,
GAsyncResult *result,
gpointer user_data)
{
GDBusConnection *connection = G_DBUS_CONNECTION (source);
GTask *task = user_data;
CallState *state = g_task_get_task_data (task);
GError *error = NULL;
GDBusMessage *reply;
GVariant *value = NULL;
reply = g_dbus_connection_send_message_with_reply_finish (connection,
result,
&error);
if (G_UNLIKELY (_g_dbus_debug_call ()))
{
_g_dbus_debug_print_lock ();
g_print ("========================================================================\n"
"GDBus-debug:Call:\n"
" <<<< ASYNC COMPLETE %s()",
state->method_name);
if (reply != NULL)
{
g_print (" (serial %d)\n"
" SUCCESS\n",
g_dbus_message_get_reply_serial (reply));
}
else
{
g_print ("\n"
" FAILED: %s\n",
error->message);
}
_g_dbus_debug_print_unlock ();
}
if (reply != NULL)
value = decode_method_reply (reply, state->method_name, state->reply_type, &state->fd_list, &error);
if (error != NULL)
g_task_return_error (task, error);
else
g_task_return_pointer (task, value, (GDestroyNotify) g_variant_unref);
g_clear_object (&reply);
g_object_unref (task);
}
/* called in any thread, with the connection's lock not held */
static void
g_dbus_connection_call_internal (GDBusConnection *connection,
const gchar *bus_name,
const gchar *object_path,
const gchar *interface_name,
const gchar *method_name,
GVariant *parameters,
const GVariantType *reply_type,
GDBusCallFlags flags,
gint timeout_msec,
GUnixFDList *fd_list,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GDBusMessage *message;
guint32 serial;
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));
g_return_if_fail (check_initialized (connection));
#ifdef G_OS_UNIX
g_return_if_fail (fd_list == NULL || G_IS_UNIX_FD_LIST (fd_list));
#else
g_return_if_fail (fd_list == NULL);
#endif
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);
#ifdef G_OS_UNIX
if (fd_list != NULL)
g_dbus_message_set_unix_fd_list (message, fd_list);
#endif
/* If the user has no callback then we can just send the message with
* the G_DBUS_MESSAGE_FLAGS_NO_REPLY_EXPECTED flag set and skip all
* the logic for processing the reply. If the service sends the reply
* anyway then it will just be ignored.
*/
if (callback != NULL)
{
CallState *state;
GTask *task;
state = g_slice_new0 (CallState);
state->method_name = g_strjoin (".", interface_name, method_name, NULL);
if (reply_type == NULL)
reply_type = G_VARIANT_TYPE_ANY;
state->reply_type = g_variant_type_copy (reply_type);
task = g_task_new (connection, cancellable, callback, user_data);
g_task_set_source_tag (task, g_dbus_connection_call_internal);
g_task_set_task_data (task, state, (GDestroyNotify) call_state_free);
g_dbus_connection_send_message_with_reply (connection,
message,
G_DBUS_SEND_MESSAGE_FLAGS_NONE,
timeout_msec,
&serial,
cancellable,
g_dbus_connection_call_done,
task);
}
else
{
GDBusMessageFlags msg_flags;
msg_flags = g_dbus_message_get_flags (message);
msg_flags |= G_DBUS_MESSAGE_FLAGS_NO_REPLY_EXPECTED;
g_dbus_message_set_flags (message, msg_flags);
g_dbus_connection_send_message (connection,
message,
G_DBUS_SEND_MESSAGE_FLAGS_NONE,
&serial, NULL);
}
if (G_UNLIKELY (_g_dbus_debug_call ()))
{
_g_dbus_debug_print_lock ();
g_print ("========================================================================\n"
"GDBus-debug:Call:\n"
" >>>> ASYNC %s.%s()\n"
" on object %s\n"
" owned by name %s (serial %d)\n",
interface_name,
method_name,
object_path,
bus_name != NULL ? bus_name : "(none)",
serial);
_g_dbus_debug_print_unlock ();
}
if (message != NULL)
g_object_unref (message);
}
/* called in any thread, with the connection's lock not held */
static GVariant *
g_dbus_connection_call_finish_internal (GDBusConnection *connection,
GUnixFDList **out_fd_list,
GAsyncResult *res,
GError **error)
{
GTask *task;
CallState *state;
GVariant *ret;
g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
g_return_val_if_fail (g_task_is_valid (res, connection), NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
task = G_TASK (res);
state = g_task_get_task_data (task);
ret = g_task_propagate_pointer (task, error);
if (!ret)
return NULL;
if (out_fd_list != NULL)
*out_fd_list = state->fd_list != NULL ? g_object_ref (state->fd_list) : NULL;
return ret;
}
/* called in any user thread, with the connection's lock not held */
static GVariant *
g_dbus_connection_call_sync_internal (GDBusConnection *connection,
const gchar *bus_name,
const gchar *object_path,
const gchar *interface_name,
const gchar *method_name,
GVariant *parameters,
const GVariantType *reply_type,
GDBusCallFlags flags,
gint timeout_msec,
GUnixFDList *fd_list,
GUnixFDList **out_fd_list,
GCancellable *cancellable,
GError **error)
{
GDBusMessage *message;
GDBusMessage *reply;
GVariant *result;
GError *local_error;
GDBusSendMessageFlags send_flags;
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);
#ifdef G_OS_UNIX
g_return_val_if_fail (fd_list == NULL || G_IS_UNIX_FD_LIST (fd_list), NULL);
#else
g_return_val_if_fail (fd_list == NULL, NULL);
#endif
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
if (!(flags & CALL_FLAGS_INITIALIZING))
g_return_val_if_fail (check_initialized (connection), FALSE);
if (reply_type == NULL)
reply_type = G_VARIANT_TYPE_ANY;
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);
#ifdef G_OS_UNIX
if (fd_list != NULL)
g_dbus_message_set_unix_fd_list (message, fd_list);
#endif
if (G_UNLIKELY (_g_dbus_debug_call ()))
{
_g_dbus_debug_print_lock ();
g_print ("========================================================================\n"
"GDBus-debug:Call:\n"
" >>>> SYNC %s.%s()\n"
" on object %s\n"
" owned by name %s\n",
interface_name,
method_name,
object_path,
bus_name != NULL ? bus_name : "(none)");
_g_dbus_debug_print_unlock ();
}
local_error = NULL;
send_flags = G_DBUS_SEND_MESSAGE_FLAGS_NONE;
/* translate from one flavour of flags to another... */
if (flags & CALL_FLAGS_INITIALIZING)
send_flags |= SEND_MESSAGE_FLAGS_INITIALIZING;
reply = g_dbus_connection_send_message_with_reply_sync (connection,
message,
send_flags,
timeout_msec,
NULL, /* guint32 *out_serial */
cancellable,
&local_error);
if (G_UNLIKELY (_g_dbus_debug_call ()))
{
_g_dbus_debug_print_lock ();
g_print ("========================================================================\n"
"GDBus-debug:Call:\n"
" <<<< SYNC COMPLETE %s.%s()\n"
" ",
interface_name,
method_name);
if (reply != NULL)
{
g_print ("SUCCESS\n");
}
else
{
g_print ("FAILED: %s\n",
local_error->message);
}
_g_dbus_debug_print_unlock ();
}
if (reply == NULL)
{
if (error != NULL)
*error = local_error;
else
g_error_free (local_error);
goto out;
}
result = decode_method_reply (reply, method_name, reply_type, out_fd_list, error);
out:
if (message != NULL)
g_object_unref (message);
if (reply != NULL)
g_object_unref (reply);
return result;
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_connection_call:
* @connection: a #GDBusConnection
* @bus_name: (nullable): 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: (nullable): a #GVariant tuple with parameters for the method
* or %NULL if not passing parameters
* @reply_type: (nullable): the expected type of the reply (which will be a
* tuple), or %NULL
* @flags: flags from the #GDBusCallFlags enumeration
* @timeout_msec: the timeout in milliseconds, -1 to use the default
* timeout or %G_MAXINT for no timeout
* @cancellable: (nullable): a #GCancellable or %NULL
* @callback: (nullable): 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 @reply_type is non-%NULL then the reply will be checked for having this type and an
* error will be raised if it does not match. Said another way, if you give a @reply_type
* then any non-%NULL return value will be of this type. Unless it’s
* %G_VARIANT_TYPE_UNIT, the @reply_type will be a tuple containing one or more
* values.
*
* If the @parameters #GVariant is floating, it is consumed. This allows
* convenient 'inline' use of g_variant_new(), e.g.:
* |[<!-- language="C" -->
* g_dbus_connection_call (connection,
* "org.freedesktop.StringThings",
* "/org/freedesktop/StringThings",
* "org.freedesktop.StringThings",
* "TwoStrings",
* g_variant_new ("(ss)",
* "Thing One",
* "Thing Two"),
* NULL,
* 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
* [thread-default main context][g-main-context-push-thread-default]
* 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.
*
* If @callback is %NULL then the D-Bus method call message will be sent with
* the %G_DBUS_MESSAGE_FLAGS_NO_REPLY_EXPECTED flag set.
*
* 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,
const GVariantType *reply_type,
GDBusCallFlags flags,
gint timeout_msec,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
g_dbus_connection_call_internal (connection, bus_name, object_path, interface_name, method_name, parameters, reply_type, flags, timeout_msec, NULL, cancellable, callback, user_data);
}
/**
* 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: (transfer full): %NULL if @error is set. Otherwise a non-floating
* #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)
{
return g_dbus_connection_call_finish_internal (connection, NULL, res, error);
}
/**
* g_dbus_connection_call_sync:
* @connection: a #GDBusConnection
* @bus_name: (nullable): 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: (nullable): a #GVariant tuple with parameters for the method
* or %NULL if not passing parameters
* @reply_type: (nullable): the expected type of the reply, or %NULL
* @flags: flags from the #GDBusCallFlags enumeration
* @timeout_msec: the timeout in milliseconds, -1 to use the default
* timeout or %G_MAXINT for no timeout
* @cancellable: (nullable): 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 @reply_type is non-%NULL then the reply will be checked for having
* this type and an error will be raised if it does not match. Said
* another way, if you give a @reply_type then any non-%NULL return
* value will be of this type.
*
* If the @parameters #GVariant is floating, it is consumed.
* This allows convenient 'inline' use of g_variant_new(), e.g.:
* |[<!-- language="C" -->
* g_dbus_connection_call_sync (connection,
* "org.freedesktop.StringThings",
* "/org/freedesktop/StringThings",
* "org.freedesktop.StringThings",
* "TwoStrings",
* g_variant_new ("(ss)",
* "Thing One",
* "Thing Two"),
* NULL,
* G_DBUS_CALL_FLAGS_NONE,
* -1,
* NULL,
* &error);
* ]|
*
* The calling thread is blocked until a reply is received. See
* g_dbus_connection_call() for the asynchronous version of
* this method.
*
* Returns: (transfer full): %NULL if @error is set. Otherwise a non-floating
* #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,
const GVariantType *reply_type,
GDBusCallFlags flags,
gint timeout_msec,
GCancellable *cancellable,
GError **error)
{
return g_dbus_connection_call_sync_internal (connection, bus_name, object_path, interface_name, method_name, parameters, reply_type, flags, timeout_msec, NULL, NULL, cancellable, error);
}
/* ---------------------------------------------------------------------------------------------------- */
#ifdef G_OS_UNIX
/**
* g_dbus_connection_call_with_unix_fd_list:
* @connection: a #GDBusConnection
* @bus_name: (nullable): 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: (nullable): a #GVariant tuple with parameters for the method
* or %NULL if not passing parameters
* @reply_type: (nullable): the expected type of the reply, or %NULL
* @flags: flags from the #GDBusCallFlags enumeration
* @timeout_msec: the timeout in milliseconds, -1 to use the default
* timeout or %G_MAXINT for no timeout
* @fd_list: (nullable): a #GUnixFDList or %NULL
* @cancellable: (nullable): a #GCancellable or %NULL
* @callback: (nullable): 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.
*
* Like g_dbus_connection_call() but also takes a #GUnixFDList object.
*
* The file descriptors normally correspond to %G_VARIANT_TYPE_HANDLE
* values in the body of the message. For example, if a message contains
* two file descriptors, @fd_list would have length 2, and
* `g_variant_new_handle (0)` and `g_variant_new_handle (1)` would appear
* somewhere in the body of the message (not necessarily in that order!)
* to represent the file descriptors at indexes 0 and 1 respectively.
*
* When designing D-Bus APIs that are intended to be interoperable,
* please note that non-GDBus implementations of D-Bus can usually only
* access file descriptors if they are referenced in this way by a
* value of type %G_VARIANT_TYPE_HANDLE in the body of the message.
*
* This method is only available on UNIX.
*
* Since: 2.30
*/
void
g_dbus_connection_call_with_unix_fd_list (GDBusConnection *connection,
const gchar *bus_name,
const gchar *object_path,
const gchar *interface_name,
const gchar *method_name,
GVariant *parameters,
const GVariantType *reply_type,
GDBusCallFlags flags,
gint timeout_msec,
GUnixFDList *fd_list,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
g_dbus_connection_call_internal (connection, bus_name, object_path, interface_name, method_name, parameters, reply_type, flags, timeout_msec, fd_list, cancellable, callback, user_data);
}
/**
* g_dbus_connection_call_with_unix_fd_list_finish:
* @connection: a #GDBusConnection
* @out_fd_list: (out) (optional) (nullable): return location for a #GUnixFDList or %NULL
* @res: a #GAsyncResult obtained from the #GAsyncReadyCallback passed to
* g_dbus_connection_call_with_unix_fd_list()
* @error: return location for error or %NULL
*
* Finishes an operation started with g_dbus_connection_call_with_unix_fd_list().
*
* The file descriptors normally correspond to %G_VARIANT_TYPE_HANDLE
* values in the body of the message. For example,
* if g_variant_get_handle() returns 5, that is intended to be a reference
* to the file descriptor that can be accessed by
* `g_unix_fd_list_get (*out_fd_list, 5, ...)`.
*
* When designing D-Bus APIs that are intended to be interoperable,
* please note that non-GDBus implementations of D-Bus can usually only
* access file descriptors if they are referenced in this way by a
* value of type %G_VARIANT_TYPE_HANDLE in the body of the message.
*
* Returns: (transfer full): %NULL if @error is set. Otherwise a non-floating
* #GVariant tuple with return values. Free with g_variant_unref().
*
* Since: 2.30
*/
GVariant *
g_dbus_connection_call_with_unix_fd_list_finish (GDBusConnection *connection,
GUnixFDList **out_fd_list,
GAsyncResult *res,
GError **error)
{
return g_dbus_connection_call_finish_internal (connection, out_fd_list, res, error);
}
/**
* g_dbus_connection_call_with_unix_fd_list_sync:
* @connection: a #GDBusConnection
* @bus_name: (nullable): 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: (nullable): a #GVariant tuple with parameters for
* the method or %NULL if not passing parameters
* @reply_type: (nullable): the expected type of the reply, or %NULL
* @flags: flags from the #GDBusCallFlags enumeration
* @timeout_msec: the timeout in milliseconds, -1 to use the default
* timeout or %G_MAXINT for no timeout
* @fd_list: (nullable): a #GUnixFDList or %NULL
* @out_fd_list: (out) (optional) (nullable): return location for a #GUnixFDList or %NULL
* @cancellable: (nullable): a #GCancellable or %NULL
* @error: return location for error or %NULL
*
* Like g_dbus_connection_call_sync() but also takes and returns #GUnixFDList objects.
* See g_dbus_connection_call_with_unix_fd_list() and
* g_dbus_connection_call_with_unix_fd_list_finish() for more details.
*
* This method is only available on UNIX.
*
* Returns: (transfer full): %NULL if @error is set. Otherwise a non-floating
* #GVariant tuple with return values. Free with g_variant_unref().
*
* Since: 2.30
*/
GVariant *
g_dbus_connection_call_with_unix_fd_list_sync (GDBusConnection *connection,
const gchar *bus_name,
const gchar *object_path,
const gchar *interface_name,
const gchar *method_name,
GVariant *parameters,
const GVariantType *reply_type,
GDBusCallFlags flags,
gint timeout_msec,
GUnixFDList *fd_list,
GUnixFDList **out_fd_list,
GCancellable *cancellable,
GError **error)
{
return g_dbus_connection_call_sync_internal (connection, bus_name, object_path, interface_name, method_name, parameters, reply_type, flags, timeout_msec, fd_list, out_fd_list, cancellable, error);
}
#endif /* G_OS_UNIX */
/* ---------------------------------------------------------------------------------------------------- */
/* called without lock held in the thread where the caller registered
* the subtree
*/
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;
GDBusInterfaceInfo **interfaces;
guint n;
gchar **subnode_paths;
gboolean has_properties_interface;
gboolean has_introspectable_interface;
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_contains ((const gchar * const *) children, requested_node))
goto out;
}
else
{
requested_node = NULL;
}
interfaces = es->vtable->introspect (es->connection,
sender,
es->object_path,
requested_node,
es->user_data);
if (interfaces != NULL)
{
has_properties_interface = FALSE;
has_introspectable_interface = FALSE;
for (n = 0; interfaces[n] != NULL; n++)
{
if (strcmp (interfaces[n]->name, DBUS_INTERFACE_PROPERTIES) == 0)
has_properties_interface = TRUE;
else if (strcmp (interfaces[n]->name, DBUS_INTERFACE_INTROSPECTABLE) == 0)
has_introspectable_interface = TRUE;
}
if (!has_properties_interface)
g_string_append (s, introspect_properties_interface);
if (!has_introspectable_interface)
g_string_append (s, introspect_introspectable_interface);
for (n = 0; interfaces[n] != NULL; n++)
{
g_dbus_interface_info_generate_xml (interfaces[n], 2, s);
g_dbus_interface_info_unref (interfaces[n]);
}
g_free (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, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
g_object_unref (reply);
handled = TRUE;
out:
g_string_free (s, TRUE);
g_strfreev (children);
return handled;
}
/* called without lock held in the thread where the caller registered
* the subtree
*/
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;
GDBusInterfaceInfo *interface_info;
const GDBusInterfaceVTable *interface_vtable;
gpointer interface_user_data;
guint n;
GDBusInterfaceInfo **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, DBUS_INTERFACE_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;
}
if (!is_root)
{
requested_node = strrchr (requested_object_path, '/') + 1;
if (~es->flags & G_DBUS_SUBTREE_FLAGS_DISPATCH_TO_UNENUMERATED_NODES)
{
/* We don't want to dispatch to unenumerated
* nodes, so ensure that the child exists.
*/
gchar **children;
gboolean exists;
children = es->vtable->enumerate (es->connection,
sender,
es->object_path,
es->user_data);
exists = g_strv_contains ((const gchar * const *) children, requested_node);
g_strfreev (children);
if (!exists)
goto out;
}
}
else
{
requested_node = NULL;
}
/* get introspection data for the node */
interfaces = es->vtable->introspect (es->connection,
sender,
requested_object_path,
requested_node,
es->user_data);
if (interfaces == NULL)
goto out;
interface_info = NULL;
for (n = 0; interfaces[n] != NULL; n++)
{
if (g_strcmp0 (interfaces[n]->name, interface_name) == 0)
interface_info = interfaces[n];
}
/* dispatch the call if the user wants to handle it */
if (interface_info != 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,
0,
es->id,
interface_info,
interface_vtable,
es->context,
interface_user_data);
CONNECTION_UNLOCK (connection);
}
/* handle DBUS_INTERFACE_PROPERTIES 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; interfaces[n] != NULL; n++)
{
if (g_strcmp0 (interfaces[n]->name, interface_name) == 0)
interface_info = interfaces[n];
}
/* Fail with DBUS_ERROR_INVALID_ARGS if the user-code
* claims it won't support the interface
*/
if (interface_info == NULL)
{
GDBusMessage *reply;
reply = g_dbus_message_new_method_error (message,
DBUS_ERROR_INVALID_ARGS,
_("No such interface “%s”"),
interface_name);
g_dbus_connection_send_message (es->connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, 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)
{
g_warning ("The subtree introspection function indicates that '%s' "
"is a valid interface name, but calling the dispatch "
"function on that interface gave us NULL", interface_name);
goto out;
}
if (is_property_get || is_property_set)
{
CONNECTION_LOCK (connection);
handled = validate_and_maybe_schedule_property_getset (es->connection,
message,
0,
es->id,
is_property_get,
interface_info,
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,
0,
es->id,
interface_info,
interface_vtable,
es->context,
interface_user_data);
CONNECTION_UNLOCK (connection);
}
}
out:
if (interfaces != NULL)
{
for (n = 0; interfaces[n] != NULL; n++)
g_dbus_interface_info_unref (interfaces[n]);
g_free (interfaces);
}
return handled;
}
typedef struct
{
GDBusMessage *message; /* (owned) */
ExportedSubtree *es; /* (owned) */
} SubtreeDeferredData;
static void
subtree_deferred_data_free (SubtreeDeferredData *data)
{
g_clear_object (&data->message);
exported_subtree_unref (data->es);
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), DBUS_INTERFACE_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,
DBUS_ERROR_UNKNOWN_METHOD,
_("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, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
g_object_unref (reply);
}
return FALSE;
}
/* called in GDBusWorker thread with connection's 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 = exported_subtree_ref (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_set_static_name (idle_source, "[gio] process_subtree_vtable_message_in_idle_cb");
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 dynamic 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
* [thread-default main context][g-main-context-push-thread-default]
* 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 fallback handler for object paths not
* registered via g_dbus_connection_register_object() or other bindings.
*
* Note that @vtable will be copied so you cannot change it after
* registration.
*
* See this [server][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);
g_return_val_if_fail (check_initialized (connection), 0);
ret = 0;
CONNECTION_LOCK (connection);
es = g_hash_table_lookup (connection->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->refcount = 1;
es->object_path = g_strdup (object_path);
es->connection = connection;
es->vtable = _g_dbus_subtree_vtable_copy (vtable);
es->flags = flags;
es->id = (guint) g_atomic_int_add (&_global_subtree_registration_id, 1); /* TODO: overflow etc. */
es->user_data = user_data;
es->user_data_free_func = user_data_free_func;
es->context = g_main_context_ref_thread_default ();
g_hash_table_insert (connection->map_object_path_to_es, es->object_path, es);
g_hash_table_insert (connection->map_id_to_es,
GUINT_TO_POINTER (es->id),
es);
ret = es->id;
out:
CONNECTION_UNLOCK (connection);
if (ret == 0 && user_data_free_func != NULL)
user_data_free_func (user_data);
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);
g_return_val_if_fail (check_initialized (connection), FALSE);
ret = FALSE;
CONNECTION_LOCK (connection);
es = g_hash_table_lookup (connection->map_id_to_es,
GUINT_TO_POINTER (registration_id));
if (es == NULL)
goto out;
g_warn_if_fail (g_hash_table_remove (connection->map_id_to_es, GUINT_TO_POINTER (es->id)));
g_warn_if_fail (g_hash_table_remove (connection->map_object_path_to_es, es->object_path));
ret = TRUE;
out:
CONNECTION_UNLOCK (connection);
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
/* may be called in any thread, with connection's 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, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
g_object_unref (reply);
}
/* may be called in any thread, with connection's lock held */
static void
handle_generic_get_machine_id_unlocked (GDBusConnection *connection,
const gchar *object_path,
GDBusMessage *message)
{
GDBusMessage *reply;
reply = NULL;
if (connection->machine_id == NULL)
{
GError *error;
error = NULL;
connection->machine_id = _g_dbus_get_machine_id (&error);
if (connection->machine_id == NULL)
{
reply = g_dbus_message_new_method_error_literal (message,
DBUS_ERROR_FAILED,
error->message);
g_error_free (error);
}
}
if (reply == NULL)
{
reply = g_dbus_message_new_method_reply (message);
g_dbus_message_set_body (reply, g_variant_new ("(s)", connection->machine_id));
}
g_dbus_connection_send_message_unlocked (connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
g_object_unref (reply);
}
/* may be called in any thread, with connection's 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, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
g_object_unref (reply);
g_string_free (s, TRUE);
}
/* may be called in any thread, with connection's 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, DBUS_INTERFACE_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, DBUS_INTERFACE_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, DBUS_INTERFACE_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 GDBusWorker thread with connection's lock held */
static void
distribute_method_call (GDBusConnection *connection,
GDBusMessage *message)
{
GDBusMessage *reply;
ExportedObject *eo;
ExportedSubtree *es;
const gchar *path;
const gchar *interface_name;
const gchar *member;
gchar *subtree_path;
gchar *needle;
gboolean object_found = FALSE;
g_assert (g_dbus_message_get_message_type (message) == G_DBUS_MESSAGE_TYPE_METHOD_CALL);
/* these are required, and should have been validated by validate_headers()
* in gdbusmessage.c already */
member = g_dbus_message_get_member (message);
path = g_dbus_message_get_path (message);
g_assert (member != NULL);
g_assert (path != NULL);
/* this is optional */
interface_name = g_dbus_message_get_interface (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 (G_UNLIKELY (_g_dbus_debug_incoming ()))
{
_g_dbus_debug_print_lock ();
g_print ("========================================================================\n"
"GDBus-debug:Incoming:\n"
" <<<< METHOD INVOCATION %s.%s()\n"
" on object %s\n"
" invoked by name %s\n"
" serial %d\n",
interface_name, member,
path,
g_dbus_message_get_sender (message) != NULL ? g_dbus_message_get_sender (message) : "(none)",
g_dbus_message_get_serial (message));
_g_dbus_debug_print_unlock ();
}
eo = g_hash_table_lookup (connection->map_object_path_to_eo, path);
if (eo != NULL)
{
if (obj_message_func (connection, eo, message, &object_found))
goto out;
}
es = g_hash_table_lookup (connection->map_object_path_to_es, path);
if (es != NULL)
{
if (subtree_message_func (connection, es, message))
goto out;
}
if (subtree_path != NULL)
{
es = g_hash_table_lookup (connection->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 - so return an error saying this */
if (object_found == TRUE)
{
reply = g_dbus_message_new_method_error (message,
DBUS_ERROR_UNKNOWN_METHOD,
_("No such interface “%s” on object at path %s"),
interface_name,
path);
}
else
{
reply = g_dbus_message_new_method_error (message,
DBUS_ERROR_UNKNOWN_METHOD,
_("Object does not exist at path “%s”"),
path);
}
g_dbus_connection_send_message_unlocked (connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
g_object_unref (reply);
out:
g_free (subtree_path);
}
/* ---------------------------------------------------------------------------------------------------- */
/* Called in any user thread, with the message_bus_lock held. */
static GWeakRef *
message_bus_get_singleton (GBusType bus_type,
GError **error)
{
GWeakRef *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;
}
/* Called in any user thread, without holding locks. */
static GDBusConnection *
get_uninitialized_connection (GBusType bus_type,
GCancellable *cancellable,
GError **error)
{
GWeakRef *singleton;
GDBusConnection *ret;
ret = NULL;
G_LOCK (message_bus_lock);
singleton = message_bus_get_singleton (bus_type, error);
if (singleton == NULL)
goto out;
ret = g_weak_ref_get (singleton);
if (ret == NULL)
{
gchar *address;
address = g_dbus_address_get_for_bus_sync (bus_type, cancellable, error);
if (address == NULL)
goto out;
ret = g_object_new (G_TYPE_DBUS_CONNECTION,
"address", address,
"flags", G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT |
#ifdef __linux__
G_DBUS_CONNECTION_FLAGS_CROSS_NAMESPACE |
#endif
G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION,
"exit-on-close", TRUE,
NULL);
g_weak_ref_set (singleton, ret);
g_free (address);
}
g_assert (ret != NULL);
out:
G_UNLOCK (message_bus_lock);
return ret;
}
/* May be called from any thread. Must not hold message_bus_lock. */
GDBusConnection *
_g_bus_get_singleton_if_exists (GBusType bus_type)
{
GWeakRef *singleton;
GDBusConnection *ret = NULL;
G_LOCK (message_bus_lock);
singleton = message_bus_get_singleton (bus_type, NULL);
if (singleton == NULL)
goto out;
ret = g_weak_ref_get (singleton);
out:
G_UNLOCK (message_bus_lock);
return ret;
}
/* May be called from any thread. Must not hold message_bus_lock. */
void
_g_bus_forget_singleton (GBusType bus_type)
{
GWeakRef *singleton;
G_LOCK (message_bus_lock);
singleton = message_bus_get_singleton (bus_type, NULL);
if (singleton != NULL)
g_weak_ref_set (singleton, NULL);
G_UNLOCK (message_bus_lock);
}
/**
* g_bus_get_sync:
* @bus_type: a #GBusType
* @cancellable: (nullable): 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() with
* G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT and
* G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION flags.
*
* Note that the returned #GDBusConnection object will (usually) have
* the #GDBusConnection:exit-on-close property set to %TRUE.
*
* Returns: (transfer full): 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_dbus_initialize ();
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)
{
GTask *task = user_data;
GError *error = NULL;
if (!g_async_initable_init_finish (G_ASYNC_INITABLE (source_object),
res,
&error))
{
g_assert (error != NULL);
g_task_return_error (task, error);
g_object_unref (source_object);
}
else
{
g_task_return_pointer (task, source_object, g_object_unref);
}
g_object_unref (task);
}
/**
* g_bus_get:
* @bus_type: a #GBusType
* @cancellable: (nullable): 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 an 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;
GTask *task;
GError *error = NULL;
_g_dbus_initialize ();
task = g_task_new (NULL, cancellable, callback, user_data);
g_task_set_source_tag (task, g_bus_get);
connection = get_uninitialized_connection (bus_type, cancellable, &error);
if (connection == NULL)
{
g_assert (error != NULL);
g_task_return_error (task, error);
g_object_unref (task);
}
else
{
g_async_initable_init_async (G_ASYNC_INITABLE (connection),
G_PRIORITY_DEFAULT,
cancellable,
bus_get_async_initable_cb,
task);
}
}
/**
* 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_sync() and
* g_dbus_connection_new_for_address() with
* G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT and
* G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION flags.
*
* Note that the returned #GDBusConnection object will (usually) have
* the #GDBusConnection:exit-on-close property set to %TRUE.
*
* Returns: (transfer full): 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)
{
g_return_val_if_fail (g_task_is_valid (res, NULL), NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
return g_task_propagate_pointer (G_TASK (res), error);
}
/* ---------------------------------------------------------------------------------------------------- */
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