/* 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 . * * Author: David Zeuthen */ #include "config.h" #include #include #include "gdbusutils.h" #include "gdbusproxy.h" #include "gioenumtypes.h" #include "gdbusconnection.h" #include "gdbuserror.h" #include "gdbusprivate.h" #include "ginitable.h" #include "gasyncinitable.h" #include "gioerror.h" #include "gtask.h" #include "gcancellable.h" #include "gdbusinterface.h" #include "gasyncresult.h" #ifdef G_OS_UNIX #include "gunixfdlist.h" #endif #include "glibintl.h" #include "gmarshal-internal.h" /** * GDBusProxy: * * `GDBusProxy` is a base class used for proxies to access a D-Bus * interface on a remote object. A `GDBusProxy` can be constructed for * both well-known and unique names. * * By default, `GDBusProxy` will cache all properties (and listen to * changes) of the remote object, and proxy all signals that get * emitted. This behaviour can be changed by passing suitable * [flags@Gio.DBusProxyFlags] when the proxy is created. If the proxy is for a * well-known name, the property cache is flushed when the name owner * vanishes and reloaded when a name owner appears. * * The unique name owner of the proxy’s name is tracked and can be read from * [property@Gio.DBusProxy:g-name-owner]. Connect to the * [signal@GObject.Object::notify] signal to get notified of changes. * Additionally, only signals and property changes emitted from the current name * owner are considered and calls are always sent to the current name owner. * This avoids a number of race conditions when the name is lost by one owner * and claimed by another. However, if no name owner currently exists, * then calls will be sent to the well-known name which may result in * the message bus launching an owner (unless * `G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START` is set). * * If the proxy is for a stateless D-Bus service, where the name owner may * be started and stopped between calls, the * [property@Gio.DBusProxy:g-name-owner] tracking of `GDBusProxy` will cause the * proxy to drop signal and property changes from the service after it has * restarted for the first time. When interacting with a stateless D-Bus * service, do not use `GDBusProxy` — use direct D-Bus method calls and signal * connections. * * The generic [signal@Gio.DBusProxy::g-properties-changed] and * [signal@Gio.DBusProxy::g-signal] signals are not very convenient to work * with. Therefore, the recommended way of working with proxies is to subclass * `GDBusProxy`, and have more natural properties and signals in your derived * class. This [example](migrating-gdbus.html#using-gdbus-codegen) shows how * this can easily be done using the [`gdbus-codegen`](gdbus-codegen.html) tool. * * A `GDBusProxy` instance can be used from multiple threads but note * that all signals (e.g. [signal@Gio.DBusProxy::g-signal], * [signal@Gio.DBusProxy::g-properties-changed] and * [signal@GObject.Object::notify]) are emitted in the thread-default main * context (see [method@GLib.MainContext.push_thread_default]) of the thread * where the instance was constructed. * * An example using a proxy for a well-known name can be found in * [`gdbus-example-watch-proxy.c`](https://gitlab.gnome.org/GNOME/glib/-/blob/HEAD/gio/tests/gdbus-example-watch-proxy.c). * * Since: 2.26 */ /* lock protecting the mutable properties: name_owner, timeout_msec, * expected_interface, and the properties hash table */ G_LOCK_DEFINE_STATIC (properties_lock); /* ---------------------------------------------------------------------------------------------------- */ static GWeakRef * weak_ref_new (GObject *object) { GWeakRef *weak_ref = g_new0 (GWeakRef, 1); g_weak_ref_init (weak_ref, object); return g_steal_pointer (&weak_ref); } static void weak_ref_free (GWeakRef *weak_ref) { g_weak_ref_clear (weak_ref); g_free (weak_ref); } /* ---------------------------------------------------------------------------------------------------- */ struct _GDBusProxyPrivate { GBusType bus_type; GDBusProxyFlags flags; GDBusConnection *connection; gchar *name; /* mutable, protected by properties_lock */ gchar *name_owner; gchar *object_path; gchar *interface_name; /* mutable, protected by properties_lock */ gint timeout_msec; guint name_owner_changed_subscription_id; GCancellable *get_all_cancellable; /* gchar* -> GVariant*, protected by properties_lock */ GHashTable *properties; /* mutable, protected by properties_lock */ GDBusInterfaceInfo *expected_interface; guint properties_changed_subscription_id; guint signals_subscription_id; gboolean initialized; /* mutable, protected by properties_lock */ GDBusObject *object; }; enum { PROP_0, PROP_G_CONNECTION, PROP_G_BUS_TYPE, PROP_G_NAME, PROP_G_NAME_OWNER, PROP_G_FLAGS, PROP_G_OBJECT_PATH, PROP_G_INTERFACE_NAME, PROP_G_DEFAULT_TIMEOUT, PROP_G_INTERFACE_INFO }; enum { PROPERTIES_CHANGED_SIGNAL, SIGNAL_SIGNAL, LAST_SIGNAL, }; static guint signals[LAST_SIGNAL] = {0}; static void dbus_interface_iface_init (GDBusInterfaceIface *dbus_interface_iface); static void initable_iface_init (GInitableIface *initable_iface); static void async_initable_iface_init (GAsyncInitableIface *async_initable_iface); G_DEFINE_TYPE_WITH_CODE (GDBusProxy, g_dbus_proxy, G_TYPE_OBJECT, G_ADD_PRIVATE (GDBusProxy) G_IMPLEMENT_INTERFACE (G_TYPE_DBUS_INTERFACE, dbus_interface_iface_init) G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE, initable_iface_init) G_IMPLEMENT_INTERFACE (G_TYPE_ASYNC_INITABLE, async_initable_iface_init)) static void g_dbus_proxy_finalize (GObject *object) { GDBusProxy *proxy = G_DBUS_PROXY (object); g_warn_if_fail (proxy->priv->get_all_cancellable == NULL); if (proxy->priv->name_owner_changed_subscription_id > 0) g_dbus_connection_signal_unsubscribe (proxy->priv->connection, proxy->priv->name_owner_changed_subscription_id); if (proxy->priv->properties_changed_subscription_id > 0) g_dbus_connection_signal_unsubscribe (proxy->priv->connection, proxy->priv->properties_changed_subscription_id); if (proxy->priv->signals_subscription_id > 0) g_dbus_connection_signal_unsubscribe (proxy->priv->connection, proxy->priv->signals_subscription_id); if (proxy->priv->connection != NULL) g_object_unref (proxy->priv->connection); g_free (proxy->priv->name); g_free (proxy->priv->name_owner); g_free (proxy->priv->object_path); g_free (proxy->priv->interface_name); if (proxy->priv->properties != NULL) g_hash_table_unref (proxy->priv->properties); if (proxy->priv->expected_interface != NULL) { g_dbus_interface_info_cache_release (proxy->priv->expected_interface); g_dbus_interface_info_unref (proxy->priv->expected_interface); } if (proxy->priv->object != NULL) g_object_remove_weak_pointer (G_OBJECT (proxy->priv->object), (gpointer *) &proxy->priv->object); G_OBJECT_CLASS (g_dbus_proxy_parent_class)->finalize (object); } static void g_dbus_proxy_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) { GDBusProxy *proxy = G_DBUS_PROXY (object); switch (prop_id) { case PROP_G_CONNECTION: g_value_set_object (value, proxy->priv->connection); break; case PROP_G_FLAGS: g_value_set_flags (value, proxy->priv->flags); break; case PROP_G_NAME: g_value_set_string (value, proxy->priv->name); break; case PROP_G_NAME_OWNER: g_value_take_string (value, g_dbus_proxy_get_name_owner (proxy)); break; case PROP_G_OBJECT_PATH: g_value_set_string (value, proxy->priv->object_path); break; case PROP_G_INTERFACE_NAME: g_value_set_string (value, proxy->priv->interface_name); break; case PROP_G_DEFAULT_TIMEOUT: g_value_set_int (value, g_dbus_proxy_get_default_timeout (proxy)); break; case PROP_G_INTERFACE_INFO: g_value_set_boxed (value, g_dbus_proxy_get_interface_info (proxy)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void g_dbus_proxy_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec) { GDBusProxy *proxy = G_DBUS_PROXY (object); switch (prop_id) { case PROP_G_CONNECTION: proxy->priv->connection = g_value_dup_object (value); break; case PROP_G_FLAGS: proxy->priv->flags = g_value_get_flags (value); break; case PROP_G_NAME: proxy->priv->name = g_value_dup_string (value); break; case PROP_G_OBJECT_PATH: proxy->priv->object_path = g_value_dup_string (value); break; case PROP_G_INTERFACE_NAME: proxy->priv->interface_name = g_value_dup_string (value); break; case PROP_G_DEFAULT_TIMEOUT: g_dbus_proxy_set_default_timeout (proxy, g_value_get_int (value)); break; case PROP_G_INTERFACE_INFO: g_dbus_proxy_set_interface_info (proxy, g_value_get_boxed (value)); break; case PROP_G_BUS_TYPE: proxy->priv->bus_type = g_value_get_enum (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void g_dbus_proxy_class_init (GDBusProxyClass *klass) { GObjectClass *gobject_class = G_OBJECT_CLASS (klass); gobject_class->finalize = g_dbus_proxy_finalize; gobject_class->set_property = g_dbus_proxy_set_property; gobject_class->get_property = g_dbus_proxy_get_property; /* Note that all property names are prefixed to avoid collisions with D-Bus property names * in derived classes */ /** * GDBusProxy:g-interface-info: * * Ensure that interactions with this proxy conform to the given * interface. This is mainly to ensure that malformed data received * from the other peer is ignored. The given #GDBusInterfaceInfo is * said to be the "expected interface". * * The checks performed are: * - When completing a method call, if the type signature of * the reply message isn't what's expected, the reply is * discarded and the #GError is set to %G_IO_ERROR_INVALID_ARGUMENT. * * - Received signals that have a type signature mismatch are dropped and * a warning is logged via g_warning(). * * - Properties received via the initial `GetAll()` call or via the * `::PropertiesChanged` signal (on the * [org.freedesktop.DBus.Properties](http://dbus.freedesktop.org/doc/dbus-specification.html#standard-interfaces-properties) * interface) or set using g_dbus_proxy_set_cached_property() * with a type signature mismatch are ignored and a warning is * logged via g_warning(). * * Note that these checks are never done on methods, signals and * properties that are not referenced in the given * #GDBusInterfaceInfo, since extending a D-Bus interface on the * service-side is not considered an ABI break. * * Since: 2.26 */ g_object_class_install_property (gobject_class, PROP_G_INTERFACE_INFO, g_param_spec_boxed ("g-interface-info", P_("Interface Information"), P_("Interface Information"), G_TYPE_DBUS_INTERFACE_INFO, G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_STATIC_NAME | G_PARAM_STATIC_BLURB | G_PARAM_STATIC_NICK)); /** * GDBusProxy:g-connection: * * The #GDBusConnection the proxy is for. * * Since: 2.26 */ g_object_class_install_property (gobject_class, PROP_G_CONNECTION, g_param_spec_object ("g-connection", P_("g-connection"), P_("The connection the proxy is for"), G_TYPE_DBUS_CONNECTION, G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_NAME | G_PARAM_STATIC_BLURB | G_PARAM_STATIC_NICK)); /** * GDBusProxy:g-bus-type: * * If this property is not %G_BUS_TYPE_NONE, then * #GDBusProxy:g-connection must be %NULL and will be set to the * #GDBusConnection obtained by calling g_bus_get() with the value * of this property. * * Since: 2.26 */ g_object_class_install_property (gobject_class, PROP_G_BUS_TYPE, g_param_spec_enum ("g-bus-type", P_("Bus Type"), P_("The bus to connect to, if any"), G_TYPE_BUS_TYPE, G_BUS_TYPE_NONE, G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_NAME | G_PARAM_STATIC_BLURB | G_PARAM_STATIC_NICK)); /** * GDBusProxy:g-flags: * * Flags from the #GDBusProxyFlags enumeration. * * Since: 2.26 */ g_object_class_install_property (gobject_class, PROP_G_FLAGS, g_param_spec_flags ("g-flags", P_("g-flags"), P_("Flags for the proxy"), G_TYPE_DBUS_PROXY_FLAGS, G_DBUS_PROXY_FLAGS_NONE, G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_NAME | G_PARAM_STATIC_BLURB | G_PARAM_STATIC_NICK)); /** * GDBusProxy:g-name: * * The well-known or unique name that the proxy is for. * * Since: 2.26 */ g_object_class_install_property (gobject_class, PROP_G_NAME, g_param_spec_string ("g-name", P_("g-name"), P_("The well-known or unique name that the proxy is for"), NULL, G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_NAME | G_PARAM_STATIC_BLURB | G_PARAM_STATIC_NICK)); /** * GDBusProxy:g-name-owner: * * The unique name that owns #GDBusProxy:g-name or %NULL if no-one * currently owns that name. You may connect to #GObject::notify signal to * track changes to this property. * * Since: 2.26 */ g_object_class_install_property (gobject_class, PROP_G_NAME_OWNER, g_param_spec_string ("g-name-owner", P_("g-name-owner"), P_("The unique name for the owner"), NULL, G_PARAM_READABLE | G_PARAM_STATIC_NAME | G_PARAM_STATIC_BLURB | G_PARAM_STATIC_NICK)); /** * GDBusProxy:g-object-path: * * The object path the proxy is for. * * Since: 2.26 */ g_object_class_install_property (gobject_class, PROP_G_OBJECT_PATH, g_param_spec_string ("g-object-path", P_("g-object-path"), P_("The object path the proxy is for"), NULL, G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_NAME | G_PARAM_STATIC_BLURB | G_PARAM_STATIC_NICK)); /** * GDBusProxy:g-interface-name: * * The D-Bus interface name the proxy is for. * * Since: 2.26 */ g_object_class_install_property (gobject_class, PROP_G_INTERFACE_NAME, g_param_spec_string ("g-interface-name", P_("g-interface-name"), P_("The D-Bus interface name the proxy is for"), NULL, G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_NAME | G_PARAM_STATIC_BLURB | G_PARAM_STATIC_NICK)); /** * GDBusProxy:g-default-timeout: * * The timeout to use if -1 (specifying default timeout) is passed * as @timeout_msec in the g_dbus_proxy_call() and * g_dbus_proxy_call_sync() functions. * * This allows applications to set a proxy-wide timeout for all * remote method invocations on the proxy. If this property is -1, * the default timeout (typically 25 seconds) is used. If set to * %G_MAXINT, then no timeout is used. * * Since: 2.26 */ g_object_class_install_property (gobject_class, PROP_G_DEFAULT_TIMEOUT, g_param_spec_int ("g-default-timeout", P_("Default Timeout"), P_("Timeout for remote method invocation"), -1, G_MAXINT, -1, G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_NAME | G_PARAM_STATIC_BLURB | G_PARAM_STATIC_NICK)); /** * GDBusProxy::g-properties-changed: * @proxy: The #GDBusProxy emitting the signal. * @changed_properties: A #GVariant containing the properties that changed (type: `a{sv}`) * @invalidated_properties: A %NULL terminated array of properties that was invalidated * * Emitted when one or more D-Bus properties on @proxy changes. The * local cache has already been updated when this signal fires. Note * that both @changed_properties and @invalidated_properties are * guaranteed to never be %NULL (either may be empty though). * * If the proxy has the flag * %G_DBUS_PROXY_FLAGS_GET_INVALIDATED_PROPERTIES set, then * @invalidated_properties will always be empty. * * This signal corresponds to the * `PropertiesChanged` D-Bus signal on the * `org.freedesktop.DBus.Properties` interface. * * Since: 2.26 */ signals[PROPERTIES_CHANGED_SIGNAL] = g_signal_new (I_("g-properties-changed"), G_TYPE_DBUS_PROXY, G_SIGNAL_RUN_LAST | G_SIGNAL_MUST_COLLECT, G_STRUCT_OFFSET (GDBusProxyClass, g_properties_changed), NULL, NULL, _g_cclosure_marshal_VOID__VARIANT_BOXED, G_TYPE_NONE, 2, G_TYPE_VARIANT, G_TYPE_STRV | G_SIGNAL_TYPE_STATIC_SCOPE); g_signal_set_va_marshaller (signals[PROPERTIES_CHANGED_SIGNAL], G_TYPE_FROM_CLASS (klass), _g_cclosure_marshal_VOID__VARIANT_BOXEDv); /** * GDBusProxy::g-signal: * @proxy: The #GDBusProxy emitting the signal. * @sender_name: (nullable): The sender of the signal or %NULL if the connection is not a bus connection. * @signal_name: The name of the signal. * @parameters: A #GVariant tuple with parameters for the signal. * * Emitted when a signal from the remote object and interface that @proxy is for, has been received. * * Since 2.72 this signal supports detailed connections. You can connect to * the detailed signal `g-signal::x` in order to receive callbacks only when * signal `x` is received from the remote object. * * Since: 2.26 */ signals[SIGNAL_SIGNAL] = g_signal_new (I_("g-signal"), G_TYPE_DBUS_PROXY, G_SIGNAL_RUN_LAST | G_SIGNAL_DETAILED | G_SIGNAL_MUST_COLLECT, G_STRUCT_OFFSET (GDBusProxyClass, g_signal), NULL, NULL, _g_cclosure_marshal_VOID__STRING_STRING_VARIANT, G_TYPE_NONE, 3, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_VARIANT); g_signal_set_va_marshaller (signals[SIGNAL_SIGNAL], G_TYPE_FROM_CLASS (klass), _g_cclosure_marshal_VOID__STRING_STRING_VARIANTv); } static void g_dbus_proxy_init (GDBusProxy *proxy) { proxy->priv = g_dbus_proxy_get_instance_private (proxy); proxy->priv->properties = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, (GDestroyNotify) g_variant_unref); } /* ---------------------------------------------------------------------------------------------------- */ /** * g_dbus_proxy_get_cached_property_names: * @proxy: A #GDBusProxy. * * Gets the names of all cached properties on @proxy. * * Returns: (transfer full) (nullable) (array zero-terminated=1): A * %NULL-terminated array of strings or %NULL if * @proxy has no cached properties. Free the returned array with * g_strfreev(). * * Since: 2.26 */ gchar ** g_dbus_proxy_get_cached_property_names (GDBusProxy *proxy) { gchar **names; GPtrArray *p; GHashTableIter iter; const gchar *key; g_return_val_if_fail (G_IS_DBUS_PROXY (proxy), NULL); G_LOCK (properties_lock); names = NULL; if (g_hash_table_size (proxy->priv->properties) == 0) goto out; p = g_ptr_array_new (); g_hash_table_iter_init (&iter, proxy->priv->properties); while (g_hash_table_iter_next (&iter, (gpointer) &key, NULL)) g_ptr_array_add (p, g_strdup (key)); g_ptr_array_sort_values (p, (GCompareFunc) g_strcmp0); g_ptr_array_add (p, NULL); names = (gchar **) g_ptr_array_free (p, FALSE); out: G_UNLOCK (properties_lock); return names; } /* properties_lock must be held for as long as you will keep the * returned value */ static const GDBusPropertyInfo * lookup_property_info (GDBusProxy *proxy, const gchar *property_name) { const GDBusPropertyInfo *info = NULL; if (proxy->priv->expected_interface == NULL) goto out; info = g_dbus_interface_info_lookup_property (proxy->priv->expected_interface, property_name); out: return info; } /** * g_dbus_proxy_get_cached_property: * @proxy: A #GDBusProxy. * @property_name: Property name. * * Looks up the value for a property from the cache. This call does no * blocking IO. * * If @proxy has an expected interface (see * #GDBusProxy:g-interface-info) and @property_name is referenced by * it, then @value is checked against the type of the property. * * Returns: (transfer full) (nullable): A reference to the #GVariant instance * that holds the value for @property_name or %NULL if the value is not in * the cache. The returned reference must be freed with g_variant_unref(). * * Since: 2.26 */ GVariant * g_dbus_proxy_get_cached_property (GDBusProxy *proxy, const gchar *property_name) { const GDBusPropertyInfo *info; GVariant *value; g_return_val_if_fail (G_IS_DBUS_PROXY (proxy), NULL); g_return_val_if_fail (property_name != NULL, NULL); G_LOCK (properties_lock); value = g_hash_table_lookup (proxy->priv->properties, property_name); if (value == NULL) goto out; info = lookup_property_info (proxy, property_name); if (info != NULL) { const gchar *type_string = g_variant_get_type_string (value); if (g_strcmp0 (type_string, info->signature) != 0) { g_warning ("Trying to get property %s with type %s but according to the expected " "interface the type is %s", property_name, type_string, info->signature); value = NULL; goto out; } } g_variant_ref (value); out: G_UNLOCK (properties_lock); return value; } /** * g_dbus_proxy_set_cached_property: * @proxy: A #GDBusProxy * @property_name: Property name. * @value: (nullable): Value for the property or %NULL to remove it from the cache. * * If @value is not %NULL, sets the cached value for the property with * name @property_name to the value in @value. * * If @value is %NULL, then the cached value is removed from the * property cache. * * If @proxy has an expected interface (see * #GDBusProxy:g-interface-info) and @property_name is referenced by * it, then @value is checked against the type of the property. * * If the @value #GVariant is floating, it is consumed. This allows * convenient 'inline' use of g_variant_new(), e.g. * |[ * g_dbus_proxy_set_cached_property (proxy, * "SomeProperty", * g_variant_new ("(si)", * "A String", * 42)); * ]| * * Normally you will not need to use this method since @proxy * is tracking changes using the * `org.freedesktop.DBus.Properties.PropertiesChanged` * D-Bus signal. However, for performance reasons an object may * decide to not use this signal for some properties and instead * use a proprietary out-of-band mechanism to transmit changes. * * As a concrete example, consider an object with a property * `ChatroomParticipants` which is an array of strings. Instead of * transmitting the same (long) array every time the property changes, * it is more efficient to only transmit the delta using e.g. signals * `ChatroomParticipantJoined(String name)` and * `ChatroomParticipantParted(String name)`. * * Since: 2.26 */ void g_dbus_proxy_set_cached_property (GDBusProxy *proxy, const gchar *property_name, GVariant *value) { const GDBusPropertyInfo *info; g_return_if_fail (G_IS_DBUS_PROXY (proxy)); g_return_if_fail (property_name != NULL); G_LOCK (properties_lock); if (value != NULL) { info = lookup_property_info (proxy, property_name); if (info != NULL) { if (g_strcmp0 (info->signature, g_variant_get_type_string (value)) != 0) { g_warning ("Trying to set property %s of type %s but according to the expected " "interface the type is %s", property_name, g_variant_get_type_string (value), info->signature); goto out; } } g_hash_table_insert (proxy->priv->properties, g_strdup (property_name), g_variant_ref_sink (value)); } else { g_hash_table_remove (proxy->priv->properties, property_name); } out: G_UNLOCK (properties_lock); } /* ---------------------------------------------------------------------------------------------------- */ static void on_signal_received (GDBusConnection *connection, const gchar *sender_name, const gchar *object_path, const gchar *interface_name, const gchar *signal_name, GVariant *parameters, gpointer user_data) { GWeakRef *proxy_weak = user_data; GDBusProxy *proxy; proxy = G_DBUS_PROXY (g_weak_ref_get (proxy_weak)); if (proxy == NULL) return; if (!proxy->priv->initialized) goto out; G_LOCK (properties_lock); if (proxy->priv->name_owner != NULL && g_strcmp0 (sender_name, proxy->priv->name_owner) != 0) { G_UNLOCK (properties_lock); goto out; } if (proxy->priv->expected_interface != NULL) { const GDBusSignalInfo *info; info = g_dbus_interface_info_lookup_signal (proxy->priv->expected_interface, signal_name); if (info != NULL) { GVariantType *expected_type; expected_type = _g_dbus_compute_complete_signature (info->args); if (!g_variant_type_equal (expected_type, g_variant_get_type (parameters))) { gchar *expected_type_string = g_variant_type_dup_string (expected_type); g_warning ("Dropping signal %s of type %s since the type from the expected interface is %s", info->name, g_variant_get_type_string (parameters), expected_type_string); g_free (expected_type_string); g_variant_type_free (expected_type); G_UNLOCK (properties_lock); goto out; } g_variant_type_free (expected_type); } } G_UNLOCK (properties_lock); g_signal_emit (proxy, signals[SIGNAL_SIGNAL], g_quark_try_string (signal_name), sender_name, signal_name, parameters); out: g_clear_object (&proxy); } /* ---------------------------------------------------------------------------------------------------- */ /* must hold properties_lock */ static void insert_property_checked (GDBusProxy *proxy, gchar *property_name, GVariant *value) { if (proxy->priv->expected_interface != NULL) { const GDBusPropertyInfo *info; info = g_dbus_interface_info_lookup_property (proxy->priv->expected_interface, property_name); /* Only check known properties */ if (info != NULL) { /* Warn about properties with the wrong type */ if (g_strcmp0 (info->signature, g_variant_get_type_string (value)) != 0) { g_warning ("Received property %s with type %s does not match expected type " "%s in the expected interface", property_name, g_variant_get_type_string (value), info->signature); goto invalid; } } } g_hash_table_insert (proxy->priv->properties, property_name, /* adopts string */ value); /* adopts value */ return; invalid: g_variant_unref (value); g_free (property_name); } typedef struct { GDBusProxy *proxy; gchar *prop_name; } InvalidatedPropGetData; static void invalidated_property_get_cb (GDBusConnection *connection, GAsyncResult *res, gpointer user_data) { InvalidatedPropGetData *data = user_data; const gchar *invalidated_properties[] = {NULL}; GVariantBuilder builder; GVariant *value = NULL; GVariant *unpacked_value = NULL; /* errors are fine, the other end could have disconnected */ value = g_dbus_connection_call_finish (connection, res, NULL); if (value == NULL) { goto out; } if (!g_variant_is_of_type (value, G_VARIANT_TYPE ("(v)"))) { g_warning ("Expected type '(v)' for Get() reply, got '%s'", g_variant_get_type_string (value)); goto out; } g_variant_get (value, "(v)", &unpacked_value); /* synthesize the a{sv} in the PropertiesChanged signal */ g_variant_builder_init (&builder, G_VARIANT_TYPE ("a{sv}")); g_variant_builder_add (&builder, "{sv}", data->prop_name, unpacked_value); G_LOCK (properties_lock); insert_property_checked (data->proxy, data->prop_name, /* adopts string */ unpacked_value); /* adopts value */ data->prop_name = NULL; G_UNLOCK (properties_lock); g_signal_emit (data->proxy, signals[PROPERTIES_CHANGED_SIGNAL], 0, g_variant_builder_end (&builder), /* consumed */ invalidated_properties); out: if (value != NULL) g_variant_unref (value); g_object_unref (data->proxy); g_free (data->prop_name); g_slice_free (InvalidatedPropGetData, data); } static void on_properties_changed (GDBusConnection *connection, const gchar *sender_name, const gchar *object_path, const gchar *interface_name, const gchar *signal_name, GVariant *parameters, gpointer user_data) { GWeakRef *proxy_weak = user_data; gboolean emit_g_signal = FALSE; GDBusProxy *proxy; const gchar *interface_name_for_signal; GVariant *changed_properties; gchar **invalidated_properties; GVariantIter iter; gchar *key; GVariant *value; guint n; changed_properties = NULL; invalidated_properties = NULL; proxy = G_DBUS_PROXY (g_weak_ref_get (proxy_weak)); if (proxy == NULL) return; if (!proxy->priv->initialized) goto out; G_LOCK (properties_lock); if (proxy->priv->name_owner != NULL && g_strcmp0 (sender_name, proxy->priv->name_owner) != 0) { G_UNLOCK (properties_lock); goto out; } if (!g_variant_is_of_type (parameters, G_VARIANT_TYPE ("(sa{sv}as)"))) { g_warning ("Value for PropertiesChanged signal with type '%s' does not match '(sa{sv}as)'", g_variant_get_type_string (parameters)); G_UNLOCK (properties_lock); goto out; } g_variant_get (parameters, "(&s@a{sv}^a&s)", &interface_name_for_signal, &changed_properties, &invalidated_properties); if (g_strcmp0 (interface_name_for_signal, proxy->priv->interface_name) != 0) { G_UNLOCK (properties_lock); goto out; } g_variant_iter_init (&iter, changed_properties); while (g_variant_iter_next (&iter, "{sv}", &key, &value)) { insert_property_checked (proxy, key, /* adopts string */ value); /* adopts value */ emit_g_signal = TRUE; } if (proxy->priv->flags & G_DBUS_PROXY_FLAGS_GET_INVALIDATED_PROPERTIES) { if (proxy->priv->name_owner != NULL) { for (n = 0; invalidated_properties[n] != NULL; n++) { InvalidatedPropGetData *data; data = g_slice_new0 (InvalidatedPropGetData); data->proxy = g_object_ref (proxy); data->prop_name = g_strdup (invalidated_properties[n]); g_dbus_connection_call (proxy->priv->connection, proxy->priv->name_owner, proxy->priv->object_path, "org.freedesktop.DBus.Properties", "Get", g_variant_new ("(ss)", proxy->priv->interface_name, data->prop_name), G_VARIANT_TYPE ("(v)"), G_DBUS_CALL_FLAGS_NONE, -1, /* timeout */ NULL, /* GCancellable */ (GAsyncReadyCallback) invalidated_property_get_cb, data); } } } else { emit_g_signal = TRUE; for (n = 0; invalidated_properties[n] != NULL; n++) { g_hash_table_remove (proxy->priv->properties, invalidated_properties[n]); } } G_UNLOCK (properties_lock); if (emit_g_signal) { g_signal_emit (proxy, signals[PROPERTIES_CHANGED_SIGNAL], 0, changed_properties, invalidated_properties); } out: g_clear_pointer (&changed_properties, g_variant_unref); g_free (invalidated_properties); g_clear_object (&proxy); } /* ---------------------------------------------------------------------------------------------------- */ static void process_get_all_reply (GDBusProxy *proxy, GVariant *result) { GVariantIter *iter; gchar *key; GVariant *value; guint num_properties; if (!g_variant_is_of_type (result, G_VARIANT_TYPE ("(a{sv})"))) { g_warning ("Value for GetAll reply with type '%s' does not match '(a{sv})'", g_variant_get_type_string (result)); goto out; } G_LOCK (properties_lock); g_variant_get (result, "(a{sv})", &iter); while (g_variant_iter_next (iter, "{sv}", &key, &value)) { insert_property_checked (proxy, key, /* adopts string */ value); /* adopts value */ } g_variant_iter_free (iter); num_properties = g_hash_table_size (proxy->priv->properties); G_UNLOCK (properties_lock); /* Synthesize ::g-properties-changed changed */ if (num_properties > 0) { GVariant *changed_properties; const gchar *invalidated_properties[1] = {NULL}; g_variant_get (result, "(@a{sv})", &changed_properties); g_signal_emit (proxy, signals[PROPERTIES_CHANGED_SIGNAL], 0, changed_properties, invalidated_properties); g_variant_unref (changed_properties); } out: ; } typedef struct { GDBusProxy *proxy; GCancellable *cancellable; gchar *name_owner; } LoadPropertiesOnNameOwnerChangedData; static void on_name_owner_changed_get_all_cb (GDBusConnection *connection, GAsyncResult *res, gpointer user_data) { LoadPropertiesOnNameOwnerChangedData *data = user_data; GVariant *result; GError *error; gboolean cancelled; cancelled = FALSE; error = NULL; result = g_dbus_connection_call_finish (connection, res, &error); if (result == NULL) { if (error->domain == G_IO_ERROR && error->code == G_IO_ERROR_CANCELLED) cancelled = TRUE; /* We just ignore if GetAll() is failing. Because this might happen * if the object has no properties at all. Or if the caller is * not authorized to see the properties. * * Either way, apps can know about this by using * get_cached_property_names() or get_cached_property(). */ if (G_UNLIKELY (_g_dbus_debug_proxy ())) { g_debug ("error: %d %d %s", error->domain, error->code, error->message); } g_error_free (error); } /* and finally we can notify */ if (!cancelled) { G_LOCK (properties_lock); g_free (data->proxy->priv->name_owner); data->proxy->priv->name_owner = g_steal_pointer (&data->name_owner); g_hash_table_remove_all (data->proxy->priv->properties); G_UNLOCK (properties_lock); if (result != NULL) { process_get_all_reply (data->proxy, result); g_variant_unref (result); } g_object_notify (G_OBJECT (data->proxy), "g-name-owner"); } if (data->cancellable == data->proxy->priv->get_all_cancellable) data->proxy->priv->get_all_cancellable = NULL; g_object_unref (data->proxy); g_object_unref (data->cancellable); g_free (data->name_owner); g_free (data); } static void on_name_owner_changed (GDBusConnection *connection, const gchar *sender_name, const gchar *object_path, const gchar *interface_name, const gchar *signal_name, GVariant *parameters, gpointer user_data) { GWeakRef *proxy_weak = user_data; GDBusProxy *proxy; const gchar *old_owner; const gchar *new_owner; proxy = G_DBUS_PROXY (g_weak_ref_get (proxy_weak)); if (proxy == NULL) return; /* if we are already trying to load properties, cancel that */ if (proxy->priv->get_all_cancellable != NULL) { g_cancellable_cancel (proxy->priv->get_all_cancellable); proxy->priv->get_all_cancellable = NULL; } g_variant_get (parameters, "(&s&s&s)", NULL, &old_owner, &new_owner); if (strlen (new_owner) == 0) { G_LOCK (properties_lock); g_free (proxy->priv->name_owner); proxy->priv->name_owner = NULL; /* Synthesize ::g-properties-changed changed */ if (!(proxy->priv->flags & G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES) && g_hash_table_size (proxy->priv->properties) > 0) { GVariantBuilder builder; GPtrArray *invalidated_properties; GHashTableIter iter; const gchar *key; /* Build changed_properties (always empty) and invalidated_properties ... */ g_variant_builder_init (&builder, G_VARIANT_TYPE ("a{sv}")); invalidated_properties = g_ptr_array_new_with_free_func (g_free); g_hash_table_iter_init (&iter, proxy->priv->properties); while (g_hash_table_iter_next (&iter, (gpointer) &key, NULL)) g_ptr_array_add (invalidated_properties, g_strdup (key)); g_ptr_array_add (invalidated_properties, NULL); /* ... throw out the properties ... */ g_hash_table_remove_all (proxy->priv->properties); G_UNLOCK (properties_lock); /* ... and finally emit the ::g-properties-changed signal */ g_signal_emit (proxy, signals[PROPERTIES_CHANGED_SIGNAL], 0, g_variant_builder_end (&builder) /* consumed */, (const gchar* const *) invalidated_properties->pdata); g_ptr_array_unref (invalidated_properties); } else { G_UNLOCK (properties_lock); } g_object_notify (G_OBJECT (proxy), "g-name-owner"); } else { G_LOCK (properties_lock); /* ignore duplicates - this can happen when activating the service */ if (g_strcmp0 (new_owner, proxy->priv->name_owner) == 0) { G_UNLOCK (properties_lock); goto out; } if (proxy->priv->flags & G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES) { g_free (proxy->priv->name_owner); proxy->priv->name_owner = g_strdup (new_owner); g_hash_table_remove_all (proxy->priv->properties); G_UNLOCK (properties_lock); g_object_notify (G_OBJECT (proxy), "g-name-owner"); } else { LoadPropertiesOnNameOwnerChangedData *data; G_UNLOCK (properties_lock); /* start loading properties.. only then emit notify::g-name-owner .. we * need to be able to cancel this in the event another NameOwnerChanged * signal suddenly happens */ g_assert (proxy->priv->get_all_cancellable == NULL); proxy->priv->get_all_cancellable = g_cancellable_new (); data = g_new0 (LoadPropertiesOnNameOwnerChangedData, 1); data->proxy = g_object_ref (proxy); data->cancellable = proxy->priv->get_all_cancellable; data->name_owner = g_strdup (new_owner); g_dbus_connection_call (proxy->priv->connection, data->name_owner, proxy->priv->object_path, "org.freedesktop.DBus.Properties", "GetAll", g_variant_new ("(s)", proxy->priv->interface_name), G_VARIANT_TYPE ("(a{sv})"), G_DBUS_CALL_FLAGS_NONE, -1, /* timeout */ proxy->priv->get_all_cancellable, (GAsyncReadyCallback) on_name_owner_changed_get_all_cb, data); } } out: g_clear_object (&proxy); } /* ---------------------------------------------------------------------------------------------------- */ static void async_init_get_all_cb (GDBusConnection *connection, GAsyncResult *res, gpointer user_data) { GTask *task = user_data; GVariant *result; GError *error; error = NULL; result = g_dbus_connection_call_finish (connection, res, &error); if (result == NULL) { /* We just ignore if GetAll() is failing. Because this might happen * if the object has no properties at all. Or if the caller is * not authorized to see the properties. * * Either way, apps can know about this by using * get_cached_property_names() or get_cached_property(). */ if (G_UNLIKELY (_g_dbus_debug_proxy ())) { g_debug ("error: %d %d %s", error->domain, error->code, error->message); } g_error_free (error); } g_task_return_pointer (task, result, (GDestroyNotify) g_variant_unref); g_object_unref (task); } static void async_init_data_set_name_owner (GTask *task, const gchar *name_owner) { GDBusProxy *proxy = g_task_get_source_object (task); gboolean get_all; if (name_owner != NULL) { G_LOCK (properties_lock); /* Must free first, since on_name_owner_changed() could run before us */ g_free (proxy->priv->name_owner); proxy->priv->name_owner = g_strdup (name_owner); G_UNLOCK (properties_lock); } get_all = TRUE; if (proxy->priv->flags & G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES) { /* Don't load properties if the API user doesn't want them */ get_all = FALSE; } else if (name_owner == NULL && proxy->priv->name != NULL) { /* Don't attempt to load properties if the name_owner is NULL (which * usually means the name isn't owned), unless name is also NULL (which * means we actually wanted to talk to the directly-connected process - * either dbus-daemon or a peer - instead of going via dbus-daemon) */ get_all = FALSE; } if (get_all) { /* load all properties asynchronously */ g_dbus_connection_call (proxy->priv->connection, name_owner, proxy->priv->object_path, "org.freedesktop.DBus.Properties", "GetAll", g_variant_new ("(s)", proxy->priv->interface_name), G_VARIANT_TYPE ("(a{sv})"), G_DBUS_CALL_FLAGS_NONE, -1, /* timeout */ g_task_get_cancellable (task), (GAsyncReadyCallback) async_init_get_all_cb, task); } else { g_task_return_pointer (task, NULL, NULL); g_object_unref (task); } } static void async_init_get_name_owner_cb (GDBusConnection *connection, GAsyncResult *res, gpointer user_data) { GTask *task = user_data; GError *error; GVariant *result; error = NULL; result = g_dbus_connection_call_finish (connection, res, &error); if (result == NULL) { if (error->domain == G_DBUS_ERROR && error->code == G_DBUS_ERROR_NAME_HAS_NO_OWNER) { g_error_free (error); async_init_data_set_name_owner (task, NULL); } else { g_task_return_error (task, error); g_object_unref (task); } } else { /* borrowed from result to avoid an extra copy */ const gchar *name_owner; g_variant_get (result, "(&s)", &name_owner); async_init_data_set_name_owner (task, name_owner); g_variant_unref (result); } } static void async_init_call_get_name_owner (GTask *task) { GDBusProxy *proxy = g_task_get_source_object (task); g_dbus_connection_call (proxy->priv->connection, "org.freedesktop.DBus", /* name */ "/org/freedesktop/DBus", /* object path */ "org.freedesktop.DBus", /* interface */ "GetNameOwner", g_variant_new ("(s)", proxy->priv->name), G_VARIANT_TYPE ("(s)"), G_DBUS_CALL_FLAGS_NONE, -1, /* timeout */ g_task_get_cancellable (task), (GAsyncReadyCallback) async_init_get_name_owner_cb, task); } static void async_init_start_service_by_name_cb (GDBusConnection *connection, GAsyncResult *res, gpointer user_data) { GTask *task = user_data; GDBusProxy *proxy = g_task_get_source_object (task); GError *error; GVariant *result; error = NULL; result = g_dbus_connection_call_finish (connection, res, &error); if (result == NULL) { /* Errors are not unexpected; the bus will reply e.g. * * org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.Epiphany2 * was not provided by any .service files * * or (see #677718) * * org.freedesktop.systemd1.Masked: Unit polkit.service is masked. * * This doesn't mean that the name doesn't have an owner, just * that it's not provided by a .service file or can't currently * be started. * * In particular, in both cases, it could be that a service * owner will actually appear later. So instead of erroring out, * we just proceed to invoke GetNameOwner() if dealing with the * kind of errors above. */ if (error->domain == G_DBUS_ERROR && error->code == G_DBUS_ERROR_SERVICE_UNKNOWN) { g_error_free (error); } else { gchar *remote_error = g_dbus_error_get_remote_error (error); if (g_strcmp0 (remote_error, "org.freedesktop.systemd1.Masked") == 0) { g_error_free (error); g_free (remote_error); } else { g_dbus_error_strip_remote_error (error); g_prefix_error (&error, _("Error calling StartServiceByName for %s: "), proxy->priv->name); g_free (remote_error); goto failed; } } } else { guint32 start_service_result; g_variant_get (result, "(u)", &start_service_result); g_variant_unref (result); if (start_service_result == 1 || /* DBUS_START_REPLY_SUCCESS */ start_service_result == 2) /* DBUS_START_REPLY_ALREADY_RUNNING */ { /* continue to invoke GetNameOwner() */ } else { error = g_error_new (G_IO_ERROR, G_IO_ERROR_FAILED, _("Unexpected reply %d from StartServiceByName(\"%s\") method"), start_service_result, proxy->priv->name); goto failed; } } async_init_call_get_name_owner (task); return; failed: g_warn_if_fail (error != NULL); g_task_return_error (task, error); g_object_unref (task); } static void async_init_call_start_service_by_name (GTask *task) { GDBusProxy *proxy = g_task_get_source_object (task); g_dbus_connection_call (proxy->priv->connection, "org.freedesktop.DBus", /* name */ "/org/freedesktop/DBus", /* object path */ "org.freedesktop.DBus", /* interface */ "StartServiceByName", g_variant_new ("(su)", proxy->priv->name, 0), G_VARIANT_TYPE ("(u)"), G_DBUS_CALL_FLAGS_NONE, -1, /* timeout */ g_task_get_cancellable (task), (GAsyncReadyCallback) async_init_start_service_by_name_cb, task); } static void async_initable_init_second_async (GAsyncInitable *initable, gint io_priority, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data) { GDBusProxy *proxy = G_DBUS_PROXY (initable); GTask *task; task = g_task_new (proxy, cancellable, callback, user_data); g_task_set_source_tag (task, async_initable_init_second_async); g_task_set_name (task, "[gio] D-Bus proxy init"); g_task_set_priority (task, io_priority); /* Check name ownership asynchronously - possibly also start the service */ if (proxy->priv->name == NULL) { /* Do nothing */ async_init_data_set_name_owner (task, NULL); } else if (g_dbus_is_unique_name (proxy->priv->name)) { async_init_data_set_name_owner (task, proxy->priv->name); } else { if ((proxy->priv->flags & G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START) || (proxy->priv->flags & G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START_AT_CONSTRUCTION)) { async_init_call_get_name_owner (task); } else { async_init_call_start_service_by_name (task); } } } static gboolean async_initable_init_second_finish (GAsyncInitable *initable, GAsyncResult *res, GError **error) { GDBusProxy *proxy = G_DBUS_PROXY (initable); GTask *task = G_TASK (res); GVariant *result; gboolean ret; ret = !g_task_had_error (task); result = g_task_propagate_pointer (task, error); if (result != NULL) { process_get_all_reply (proxy, result); g_variant_unref (result); } proxy->priv->initialized = TRUE; return ret; } /* ---------------------------------------------------------------------------------------------------- */ static void async_initable_init_first (GAsyncInitable *initable) { GDBusProxy *proxy = G_DBUS_PROXY (initable); GDBusSignalFlags signal_flags = G_DBUS_SIGNAL_FLAGS_NONE; if (proxy->priv->flags & G_DBUS_PROXY_FLAGS_NO_MATCH_RULE) signal_flags |= G_DBUS_SIGNAL_FLAGS_NO_MATCH_RULE; if (!(proxy->priv->flags & G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES)) { /* subscribe to PropertiesChanged() */ proxy->priv->properties_changed_subscription_id = g_dbus_connection_signal_subscribe (proxy->priv->connection, proxy->priv->name, "org.freedesktop.DBus.Properties", "PropertiesChanged", proxy->priv->object_path, proxy->priv->interface_name, signal_flags, on_properties_changed, weak_ref_new (G_OBJECT (proxy)), (GDestroyNotify) weak_ref_free); } if (!(proxy->priv->flags & G_DBUS_PROXY_FLAGS_DO_NOT_CONNECT_SIGNALS)) { /* subscribe to all signals for the object */ proxy->priv->signals_subscription_id = g_dbus_connection_signal_subscribe (proxy->priv->connection, proxy->priv->name, proxy->priv->interface_name, NULL, /* member */ proxy->priv->object_path, NULL, /* arg0 */ signal_flags, on_signal_received, weak_ref_new (G_OBJECT (proxy)), (GDestroyNotify) weak_ref_free); } if (proxy->priv->name != NULL && (g_dbus_connection_get_flags (proxy->priv->connection) & G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION)) { proxy->priv->name_owner_changed_subscription_id = g_dbus_connection_signal_subscribe (proxy->priv->connection, "org.freedesktop.DBus", /* name */ "org.freedesktop.DBus", /* interface */ "NameOwnerChanged", /* signal name */ "/org/freedesktop/DBus", /* path */ proxy->priv->name, /* arg0 */ signal_flags, on_name_owner_changed, weak_ref_new (G_OBJECT (proxy)), (GDestroyNotify) weak_ref_free); } } /* ---------------------------------------------------------------------------------------------------- */ /* initialization is split into two parts - the first is the * non-blocking part that requires the callers GMainContext - the * second is a blocking part async part that doesn't require the * callers GMainContext.. we do this split so the code can be reused * in the GInitable implementation below. * * Note that obtaining a GDBusConnection is not shared between the two * paths. */ static void init_second_async_cb (GObject *source_object, GAsyncResult *res, gpointer user_data) { GTask *task = user_data; GError *error = NULL; if (async_initable_init_second_finish (G_ASYNC_INITABLE (source_object), res, &error)) g_task_return_boolean (task, TRUE); else g_task_return_error (task, error); g_object_unref (task); } static void get_connection_cb (GObject *source_object, GAsyncResult *res, gpointer user_data) { GTask *task = user_data; GDBusProxy *proxy = g_task_get_source_object (task); GError *error; error = NULL; proxy->priv->connection = g_bus_get_finish (res, &error); if (proxy->priv->connection == NULL) { g_task_return_error (task, error); g_object_unref (task); } else { async_initable_init_first (G_ASYNC_INITABLE (proxy)); async_initable_init_second_async (G_ASYNC_INITABLE (proxy), g_task_get_priority (task), g_task_get_cancellable (task), init_second_async_cb, task); } } static void async_initable_init_async (GAsyncInitable *initable, gint io_priority, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data) { GDBusProxy *proxy = G_DBUS_PROXY (initable); GTask *task; task = g_task_new (proxy, cancellable, callback, user_data); g_task_set_source_tag (task, async_initable_init_async); g_task_set_name (task, "[gio] D-Bus proxy init"); g_task_set_priority (task, io_priority); if (proxy->priv->bus_type != G_BUS_TYPE_NONE) { g_assert (proxy->priv->connection == NULL); g_bus_get (proxy->priv->bus_type, cancellable, get_connection_cb, task); } else { async_initable_init_first (initable); async_initable_init_second_async (initable, io_priority, cancellable, init_second_async_cb, task); } } static gboolean async_initable_init_finish (GAsyncInitable *initable, GAsyncResult *res, GError **error) { return g_task_propagate_boolean (G_TASK (res), error); } static void async_initable_iface_init (GAsyncInitableIface *async_initable_iface) { async_initable_iface->init_async = async_initable_init_async; async_initable_iface->init_finish = async_initable_init_finish; } /* ---------------------------------------------------------------------------------------------------- */ typedef struct { GMainContext *context; GMainLoop *loop; GAsyncResult *res; } InitableAsyncInitableData; static void async_initable_init_async_cb (GObject *source_object, GAsyncResult *res, gpointer user_data) { InitableAsyncInitableData *data = user_data; data->res = g_object_ref (res); g_main_loop_quit (data->loop); } /* Simply reuse the GAsyncInitable implementation but run the first * part (that is non-blocking and requires the callers GMainContext) * with the callers GMainContext.. and the second with a private * GMainContext (bug 621310 is slightly related). * * Note that obtaining a GDBusConnection is not shared between the two * paths. */ static gboolean initable_init (GInitable *initable, GCancellable *cancellable, GError **error) { GDBusProxy *proxy = G_DBUS_PROXY (initable); InitableAsyncInitableData *data; gboolean ret; ret = FALSE; if (proxy->priv->bus_type != G_BUS_TYPE_NONE) { g_assert (proxy->priv->connection == NULL); proxy->priv->connection = g_bus_get_sync (proxy->priv->bus_type, cancellable, error); if (proxy->priv->connection == NULL) goto out; } async_initable_init_first (G_ASYNC_INITABLE (initable)); data = g_new0 (InitableAsyncInitableData, 1); data->context = g_main_context_new (); data->loop = g_main_loop_new (data->context, FALSE); g_main_context_push_thread_default (data->context); async_initable_init_second_async (G_ASYNC_INITABLE (initable), G_PRIORITY_DEFAULT, cancellable, async_initable_init_async_cb, data); g_main_loop_run (data->loop); ret = async_initable_init_second_finish (G_ASYNC_INITABLE (initable), data->res, error); g_main_context_pop_thread_default (data->context); g_main_context_unref (data->context); g_main_loop_unref (data->loop); g_object_unref (data->res); g_free (data); out: return ret; } static void initable_iface_init (GInitableIface *initable_iface) { initable_iface->init = initable_init; } /* ---------------------------------------------------------------------------------------------------- */ /** * g_dbus_proxy_new: * @connection: A #GDBusConnection. * @flags: Flags used when constructing the proxy. * @info: (nullable): A #GDBusInterfaceInfo specifying the minimal interface that @proxy conforms to or %NULL. * @name: (nullable): A bus name (well-known or unique) or %NULL if @connection is not a message bus connection. * @object_path: An object path. * @interface_name: A D-Bus interface name. * @cancellable: (nullable): A #GCancellable or %NULL. * @callback: Callback function to invoke when the proxy is ready. * @user_data: User data to pass to @callback. * * Creates a proxy for accessing @interface_name on the remote object * at @object_path owned by @name at @connection and asynchronously * loads D-Bus properties unless the * %G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES flag is used. Connect to * the #GDBusProxy::g-properties-changed signal to get notified about * property changes. * * If the %G_DBUS_PROXY_FLAGS_DO_NOT_CONNECT_SIGNALS flag is not set, also sets up * match rules for signals. Connect to the #GDBusProxy::g-signal signal * to handle signals from the remote object. * * If both %G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES and * %G_DBUS_PROXY_FLAGS_DO_NOT_CONNECT_SIGNALS are set, this constructor is * guaranteed to complete immediately without blocking. * * If @name is a well-known name and the * %G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START and %G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START_AT_CONSTRUCTION * flags aren't set and no name owner currently exists, the message bus * will be requested to launch a name owner for the name. * * This is a failable asynchronous constructor - when the proxy is * ready, @callback will be invoked and you can use * g_dbus_proxy_new_finish() to get the result. * * See g_dbus_proxy_new_sync() and for a synchronous version of this constructor. * * #GDBusProxy is used in this [example][gdbus-wellknown-proxy]. * * Since: 2.26 */ void g_dbus_proxy_new (GDBusConnection *connection, GDBusProxyFlags flags, GDBusInterfaceInfo *info, const gchar *name, const gchar *object_path, const gchar *interface_name, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data) { _g_dbus_initialize (); g_return_if_fail (G_IS_DBUS_CONNECTION (connection)); g_return_if_fail ((name == NULL && g_dbus_connection_get_unique_name (connection) == NULL) || g_dbus_is_name (name)); g_return_if_fail (g_variant_is_object_path (object_path)); g_return_if_fail (g_dbus_is_interface_name (interface_name)); g_async_initable_new_async (G_TYPE_DBUS_PROXY, G_PRIORITY_DEFAULT, cancellable, callback, user_data, "g-flags", flags, "g-interface-info", info, "g-name", name, "g-connection", connection, "g-object-path", object_path, "g-interface-name", interface_name, NULL); } /** * g_dbus_proxy_new_finish: * @res: A #GAsyncResult obtained from the #GAsyncReadyCallback function passed to g_dbus_proxy_new(). * @error: Return location for error or %NULL. * * Finishes creating a #GDBusProxy. * * Returns: (transfer full): A #GDBusProxy or %NULL if @error is set. * Free with g_object_unref(). * * Since: 2.26 */ GDBusProxy * g_dbus_proxy_new_finish (GAsyncResult *res, GError **error) { GObject *object; GObject *source_object; 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_PROXY (object); else return NULL; } /** * g_dbus_proxy_new_sync: * @connection: A #GDBusConnection. * @flags: Flags used when constructing the proxy. * @info: (nullable): A #GDBusInterfaceInfo specifying the minimal interface that @proxy conforms to or %NULL. * @name: (nullable): A bus name (well-known or unique) or %NULL if @connection is not a message bus connection. * @object_path: An object path. * @interface_name: A D-Bus interface name. * @cancellable: (nullable): A #GCancellable or %NULL. * @error: (nullable): Return location for error or %NULL. * * Creates a proxy for accessing @interface_name on the remote object * at @object_path owned by @name at @connection and synchronously * loads D-Bus properties unless the * %G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES flag is used. * * If the %G_DBUS_PROXY_FLAGS_DO_NOT_CONNECT_SIGNALS flag is not set, also sets up * match rules for signals. Connect to the #GDBusProxy::g-signal signal * to handle signals from the remote object. * * If both %G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES and * %G_DBUS_PROXY_FLAGS_DO_NOT_CONNECT_SIGNALS are set, this constructor is * guaranteed to return immediately without blocking. * * If @name is a well-known name and the * %G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START and %G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START_AT_CONSTRUCTION * flags aren't set and no name owner currently exists, the message bus * will be requested to launch a name owner for the name. * * This is a synchronous failable constructor. See g_dbus_proxy_new() * and g_dbus_proxy_new_finish() for the asynchronous version. * * #GDBusProxy is used in this [example][gdbus-wellknown-proxy]. * * Returns: (transfer full): A #GDBusProxy or %NULL if error is set. * Free with g_object_unref(). * * Since: 2.26 */ GDBusProxy * g_dbus_proxy_new_sync (GDBusConnection *connection, GDBusProxyFlags flags, GDBusInterfaceInfo *info, const gchar *name, const gchar *object_path, const gchar *interface_name, GCancellable *cancellable, GError **error) { GInitable *initable; g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL); g_return_val_if_fail ((name == NULL && g_dbus_connection_get_unique_name (connection) == NULL) || g_dbus_is_name (name), NULL); g_return_val_if_fail (g_variant_is_object_path (object_path), NULL); g_return_val_if_fail (g_dbus_is_interface_name (interface_name), NULL); initable = g_initable_new (G_TYPE_DBUS_PROXY, cancellable, error, "g-flags", flags, "g-interface-info", info, "g-name", name, "g-connection", connection, "g-object-path", object_path, "g-interface-name", interface_name, NULL); if (initable != NULL) return G_DBUS_PROXY (initable); else return NULL; } /* ---------------------------------------------------------------------------------------------------- */ /** * g_dbus_proxy_new_for_bus: * @bus_type: A #GBusType. * @flags: Flags used when constructing the proxy. * @info: (nullable): A #GDBusInterfaceInfo specifying the minimal interface that @proxy conforms to or %NULL. * @name: A bus name (well-known or unique). * @object_path: An object path. * @interface_name: A D-Bus interface name. * @cancellable: (nullable): A #GCancellable or %NULL. * @callback: Callback function to invoke when the proxy is ready. * @user_data: User data to pass to @callback. * * Like g_dbus_proxy_new() but takes a #GBusType instead of a #GDBusConnection. * * #GDBusProxy is used in this [example][gdbus-wellknown-proxy]. * * Since: 2.26 */ void g_dbus_proxy_new_for_bus (GBusType bus_type, GDBusProxyFlags flags, GDBusInterfaceInfo *info, const gchar *name, const gchar *object_path, const gchar *interface_name, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data) { _g_dbus_initialize (); g_return_if_fail (g_dbus_is_name (name)); g_return_if_fail (g_variant_is_object_path (object_path)); g_return_if_fail (g_dbus_is_interface_name (interface_name)); g_async_initable_new_async (G_TYPE_DBUS_PROXY, G_PRIORITY_DEFAULT, cancellable, callback, user_data, "g-flags", flags, "g-interface-info", info, "g-name", name, "g-bus-type", bus_type, "g-object-path", object_path, "g-interface-name", interface_name, NULL); } /** * g_dbus_proxy_new_for_bus_finish: * @res: A #GAsyncResult obtained from the #GAsyncReadyCallback function passed to g_dbus_proxy_new_for_bus(). * @error: Return location for error or %NULL. * * Finishes creating a #GDBusProxy. * * Returns: (transfer full): A #GDBusProxy or %NULL if @error is set. * Free with g_object_unref(). * * Since: 2.26 */ GDBusProxy * g_dbus_proxy_new_for_bus_finish (GAsyncResult *res, GError **error) { return g_dbus_proxy_new_finish (res, error); } /** * g_dbus_proxy_new_for_bus_sync: * @bus_type: A #GBusType. * @flags: Flags used when constructing the proxy. * @info: (nullable): A #GDBusInterfaceInfo specifying the minimal interface * that @proxy conforms to or %NULL. * @name: A bus name (well-known or unique). * @object_path: An object path. * @interface_name: A D-Bus interface name. * @cancellable: (nullable): A #GCancellable or %NULL. * @error: Return location for error or %NULL. * * Like g_dbus_proxy_new_sync() but takes a #GBusType instead of a #GDBusConnection. * * #GDBusProxy is used in this [example][gdbus-wellknown-proxy]. * * Returns: (transfer full): A #GDBusProxy or %NULL if error is set. * Free with g_object_unref(). * * Since: 2.26 */ GDBusProxy * g_dbus_proxy_new_for_bus_sync (GBusType bus_type, GDBusProxyFlags flags, GDBusInterfaceInfo *info, const gchar *name, const gchar *object_path, const gchar *interface_name, GCancellable *cancellable, GError **error) { GInitable *initable; _g_dbus_initialize (); g_return_val_if_fail (g_dbus_is_name (name), NULL); g_return_val_if_fail (g_variant_is_object_path (object_path), NULL); g_return_val_if_fail (g_dbus_is_interface_name (interface_name), NULL); initable = g_initable_new (G_TYPE_DBUS_PROXY, cancellable, error, "g-flags", flags, "g-interface-info", info, "g-name", name, "g-bus-type", bus_type, "g-object-path", object_path, "g-interface-name", interface_name, NULL); if (initable != NULL) return G_DBUS_PROXY (initable); else return NULL; } /* ---------------------------------------------------------------------------------------------------- */ /** * g_dbus_proxy_get_connection: * @proxy: A #GDBusProxy. * * Gets the connection @proxy is for. * * Returns: (transfer none) (not nullable): A #GDBusConnection owned by @proxy. Do not free. * * Since: 2.26 */ GDBusConnection * g_dbus_proxy_get_connection (GDBusProxy *proxy) { g_return_val_if_fail (G_IS_DBUS_PROXY (proxy), NULL); return proxy->priv->connection; } /** * g_dbus_proxy_get_flags: * @proxy: A #GDBusProxy. * * Gets the flags that @proxy was constructed with. * * Returns: Flags from the #GDBusProxyFlags enumeration. * * Since: 2.26 */ GDBusProxyFlags g_dbus_proxy_get_flags (GDBusProxy *proxy) { g_return_val_if_fail (G_IS_DBUS_PROXY (proxy), 0); return proxy->priv->flags; } /** * g_dbus_proxy_get_name: * @proxy: A #GDBusProxy. * * Gets the name that @proxy was constructed for. * * When connected to a message bus, this will usually be non-%NULL. * However, it may be %NULL for a proxy that communicates using a peer-to-peer * pattern. * * Returns: (nullable): A string owned by @proxy. Do not free. * * Since: 2.26 */ const gchar * g_dbus_proxy_get_name (GDBusProxy *proxy) { g_return_val_if_fail (G_IS_DBUS_PROXY (proxy), NULL); return proxy->priv->name; } /** * g_dbus_proxy_get_name_owner: * @proxy: A #GDBusProxy. * * The unique name that owns the name that @proxy is for or %NULL if * no-one currently owns that name. You may connect to the * #GObject::notify signal to track changes to the * #GDBusProxy:g-name-owner property. * * Returns: (transfer full) (nullable): The name owner or %NULL if no name * owner exists. Free with g_free(). * * Since: 2.26 */ gchar * g_dbus_proxy_get_name_owner (GDBusProxy *proxy) { gchar *ret; g_return_val_if_fail (G_IS_DBUS_PROXY (proxy), NULL); G_LOCK (properties_lock); ret = g_strdup (proxy->priv->name_owner); G_UNLOCK (properties_lock); return ret; } /** * g_dbus_proxy_get_object_path: * @proxy: A #GDBusProxy. * * Gets the object path @proxy is for. * * Returns: (not nullable): A string owned by @proxy. Do not free. * * Since: 2.26 */ const gchar * g_dbus_proxy_get_object_path (GDBusProxy *proxy) { g_return_val_if_fail (G_IS_DBUS_PROXY (proxy), NULL); return proxy->priv->object_path; } /** * g_dbus_proxy_get_interface_name: * @proxy: A #GDBusProxy. * * Gets the D-Bus interface name @proxy is for. * * Returns: (not nullable): A string owned by @proxy. Do not free. * * Since: 2.26 */ const gchar * g_dbus_proxy_get_interface_name (GDBusProxy *proxy) { g_return_val_if_fail (G_IS_DBUS_PROXY (proxy), NULL); return proxy->priv->interface_name; } /** * g_dbus_proxy_get_default_timeout: * @proxy: A #GDBusProxy. * * Gets the timeout to use if -1 (specifying default timeout) is * passed as @timeout_msec in the g_dbus_proxy_call() and * g_dbus_proxy_call_sync() functions. * * See the #GDBusProxy:g-default-timeout property for more details. * * Returns: Timeout to use for @proxy. * * Since: 2.26 */ gint g_dbus_proxy_get_default_timeout (GDBusProxy *proxy) { gint ret; g_return_val_if_fail (G_IS_DBUS_PROXY (proxy), -1); G_LOCK (properties_lock); ret = proxy->priv->timeout_msec; G_UNLOCK (properties_lock); return ret; } /** * g_dbus_proxy_set_default_timeout: * @proxy: A #GDBusProxy. * @timeout_msec: Timeout in milliseconds. * * Sets the timeout to use if -1 (specifying default timeout) is * passed as @timeout_msec in the g_dbus_proxy_call() and * g_dbus_proxy_call_sync() functions. * * See the #GDBusProxy:g-default-timeout property for more details. * * Since: 2.26 */ void g_dbus_proxy_set_default_timeout (GDBusProxy *proxy, gint timeout_msec) { g_return_if_fail (G_IS_DBUS_PROXY (proxy)); g_return_if_fail (timeout_msec == -1 || timeout_msec >= 0); G_LOCK (properties_lock); if (proxy->priv->timeout_msec != timeout_msec) { proxy->priv->timeout_msec = timeout_msec; G_UNLOCK (properties_lock); g_object_notify (G_OBJECT (proxy), "g-default-timeout"); } else { G_UNLOCK (properties_lock); } } /** * g_dbus_proxy_get_interface_info: * @proxy: A #GDBusProxy * * Returns the #GDBusInterfaceInfo, if any, specifying the interface * that @proxy conforms to. See the #GDBusProxy:g-interface-info * property for more details. * * Returns: (transfer none) (nullable): A #GDBusInterfaceInfo or %NULL. * Do not unref the returned object, it is owned by @proxy. * * Since: 2.26 */ GDBusInterfaceInfo * g_dbus_proxy_get_interface_info (GDBusProxy *proxy) { GDBusInterfaceInfo *ret; g_return_val_if_fail (G_IS_DBUS_PROXY (proxy), NULL); G_LOCK (properties_lock); ret = proxy->priv->expected_interface; G_UNLOCK (properties_lock); /* FIXME: returning a borrowed ref with no guarantee that nobody will * call g_dbus_proxy_set_interface_info() and make it invalid... */ return ret; } /** * g_dbus_proxy_set_interface_info: * @proxy: A #GDBusProxy * @info: (transfer none) (nullable): Minimum interface this proxy conforms to * or %NULL to unset. * * Ensure that interactions with @proxy conform to the given * interface. See the #GDBusProxy:g-interface-info property for more * details. * * Since: 2.26 */ void g_dbus_proxy_set_interface_info (GDBusProxy *proxy, GDBusInterfaceInfo *info) { g_return_if_fail (G_IS_DBUS_PROXY (proxy)); G_LOCK (properties_lock); if (proxy->priv->expected_interface != NULL) { g_dbus_interface_info_cache_release (proxy->priv->expected_interface); g_dbus_interface_info_unref (proxy->priv->expected_interface); } proxy->priv->expected_interface = info != NULL ? g_dbus_interface_info_ref (info) : NULL; if (proxy->priv->expected_interface != NULL) g_dbus_interface_info_cache_build (proxy->priv->expected_interface); G_UNLOCK (properties_lock); } /* ---------------------------------------------------------------------------------------------------- */ static gboolean maybe_split_method_name (const gchar *method_name, gchar **out_interface_name, const gchar **out_method_name) { gboolean was_split; was_split = FALSE; g_assert (out_interface_name != NULL); g_assert (out_method_name != NULL); *out_interface_name = NULL; *out_method_name = NULL; if (strchr (method_name, '.') != NULL) { gchar *p; gchar *last_dot; p = g_strdup (method_name); last_dot = strrchr (p, '.'); *last_dot = '\0'; *out_interface_name = p; *out_method_name = last_dot + 1; was_split = TRUE; } return was_split; } typedef struct { GVariant *value; #ifdef G_OS_UNIX GUnixFDList *fd_list; #endif } ReplyData; static void reply_data_free (ReplyData *data) { g_variant_unref (data->value); #ifdef G_OS_UNIX if (data->fd_list != NULL) g_object_unref (data->fd_list); #endif g_slice_free (ReplyData, data); } static void reply_cb (GDBusConnection *connection, GAsyncResult *res, gpointer user_data) { GTask *task = user_data; GVariant *value; GError *error; #ifdef G_OS_UNIX GUnixFDList *fd_list; #endif error = NULL; #ifdef G_OS_UNIX value = g_dbus_connection_call_with_unix_fd_list_finish (connection, &fd_list, res, &error); #else value = g_dbus_connection_call_finish (connection, res, &error); #endif if (error != NULL) { g_task_return_error (task, error); } else { ReplyData *data; data = g_slice_new0 (ReplyData); data->value = value; #ifdef G_OS_UNIX data->fd_list = fd_list; #endif g_task_return_pointer (task, data, (GDestroyNotify) reply_data_free); } g_object_unref (task); } /* properties_lock must be held for as long as you will keep the * returned value */ static const GDBusMethodInfo * lookup_method_info (GDBusProxy *proxy, const gchar *method_name) { const GDBusMethodInfo *info = NULL; if (proxy->priv->expected_interface == NULL) goto out; info = g_dbus_interface_info_lookup_method (proxy->priv->expected_interface, method_name); out: return info; } /* properties_lock must be held for as long as you will keep the * returned value */ static const gchar * get_destination_for_call (GDBusProxy *proxy) { const gchar *ret; ret = NULL; /* If proxy->priv->name is a unique name, then proxy->priv->name_owner * is never NULL and always the same as proxy->priv->name. We use this * knowledge to avoid checking if proxy->priv->name is a unique or * well-known name. */ ret = proxy->priv->name_owner; if (ret != NULL) goto out; if (proxy->priv->flags & G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START) goto out; ret = proxy->priv->name; out: return ret; } /* ---------------------------------------------------------------------------------------------------- */ static void g_dbus_proxy_call_internal (GDBusProxy *proxy, const gchar *method_name, GVariant *parameters, GDBusCallFlags flags, gint timeout_msec, GUnixFDList *fd_list, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data) { GTask *task; gboolean was_split; gchar *split_interface_name; const gchar *split_method_name; const gchar *target_method_name; const gchar *target_interface_name; gchar *destination; GVariantType *reply_type; GAsyncReadyCallback my_callback; g_return_if_fail (G_IS_DBUS_PROXY (proxy)); g_return_if_fail (g_dbus_is_member_name (method_name) || g_dbus_is_interface_name (method_name)); g_return_if_fail (parameters == NULL || g_variant_is_of_type (parameters, G_VARIANT_TYPE_TUPLE)); g_return_if_fail (timeout_msec == -1 || timeout_msec >= 0); #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 reply_type = NULL; split_interface_name = NULL; /* g_dbus_connection_call() is optimised for the case of a NULL * callback. If we get a NULL callback from our user then make sure * we pass along a NULL callback for ourselves as well. */ if (callback != NULL) { my_callback = (GAsyncReadyCallback) reply_cb; task = g_task_new (proxy, cancellable, callback, user_data); g_task_set_source_tag (task, g_dbus_proxy_call_internal); g_task_set_name (task, "[gio] D-Bus proxy call"); } else { my_callback = NULL; task = NULL; } G_LOCK (properties_lock); was_split = maybe_split_method_name (method_name, &split_interface_name, &split_method_name); target_method_name = was_split ? split_method_name : method_name; target_interface_name = was_split ? split_interface_name : proxy->priv->interface_name; /* Warn if method is unexpected (cf. :g-interface-info) */ if (!was_split) { const GDBusMethodInfo *expected_method_info; expected_method_info = lookup_method_info (proxy, target_method_name); if (expected_method_info != NULL) reply_type = _g_dbus_compute_complete_signature (expected_method_info->out_args); } destination = NULL; if (proxy->priv->name != NULL) { destination = g_strdup (get_destination_for_call (proxy)); if (destination == NULL) { if (task != NULL) { g_task_return_new_error (task, G_IO_ERROR, G_IO_ERROR_FAILED, _("Cannot invoke method; proxy is for the well-known name %s without an owner, and proxy was constructed with the G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START flag"), proxy->priv->name); g_object_unref (task); } G_UNLOCK (properties_lock); goto out; } } G_UNLOCK (properties_lock); #ifdef G_OS_UNIX g_dbus_connection_call_with_unix_fd_list (proxy->priv->connection, destination, proxy->priv->object_path, target_interface_name, target_method_name, parameters, reply_type, flags, timeout_msec == -1 ? proxy->priv->timeout_msec : timeout_msec, fd_list, cancellable, my_callback, task); #else g_dbus_connection_call (proxy->priv->connection, destination, proxy->priv->object_path, target_interface_name, target_method_name, parameters, reply_type, flags, timeout_msec == -1 ? proxy->priv->timeout_msec : timeout_msec, cancellable, my_callback, task); #endif out: if (reply_type != NULL) g_variant_type_free (reply_type); g_free (destination); g_free (split_interface_name); } static GVariant * g_dbus_proxy_call_finish_internal (GDBusProxy *proxy, GUnixFDList **out_fd_list, GAsyncResult *res, GError **error) { GVariant *value; ReplyData *data; g_return_val_if_fail (G_IS_DBUS_PROXY (proxy), NULL); g_return_val_if_fail (g_task_is_valid (res, proxy), NULL); g_return_val_if_fail (error == NULL || *error == NULL, NULL); value = NULL; data = g_task_propagate_pointer (G_TASK (res), error); if (!data) goto out; value = g_variant_ref (data->value); #ifdef G_OS_UNIX if (out_fd_list != NULL) *out_fd_list = data->fd_list != NULL ? g_object_ref (data->fd_list) : NULL; #endif reply_data_free (data); out: return value; } static GVariant * g_dbus_proxy_call_sync_internal (GDBusProxy *proxy, const gchar *method_name, GVariant *parameters, GDBusCallFlags flags, gint timeout_msec, GUnixFDList *fd_list, GUnixFDList **out_fd_list, GCancellable *cancellable, GError **error) { GVariant *ret; gboolean was_split; gchar *split_interface_name; const gchar *split_method_name; const gchar *target_method_name; const gchar *target_interface_name; gchar *destination; GVariantType *reply_type; g_return_val_if_fail (G_IS_DBUS_PROXY (proxy), NULL); g_return_val_if_fail (g_dbus_is_member_name (method_name) || g_dbus_is_interface_name (method_name), NULL); g_return_val_if_fail (parameters == NULL || g_variant_is_of_type (parameters, G_VARIANT_TYPE_TUPLE), NULL); g_return_val_if_fail (timeout_msec == -1 || timeout_msec >= 0, 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); reply_type = NULL; G_LOCK (properties_lock); was_split = maybe_split_method_name (method_name, &split_interface_name, &split_method_name); target_method_name = was_split ? split_method_name : method_name; target_interface_name = was_split ? split_interface_name : proxy->priv->interface_name; /* Warn if method is unexpected (cf. :g-interface-info) */ if (!was_split) { const GDBusMethodInfo *expected_method_info; expected_method_info = lookup_method_info (proxy, target_method_name); if (expected_method_info != NULL) reply_type = _g_dbus_compute_complete_signature (expected_method_info->out_args); } destination = NULL; if (proxy->priv->name != NULL) { destination = g_strdup (get_destination_for_call (proxy)); if (destination == NULL) { g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED, _("Cannot invoke method; proxy is for the well-known name %s without an owner, and proxy was constructed with the G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START flag"), proxy->priv->name); ret = NULL; G_UNLOCK (properties_lock); goto out; } } G_UNLOCK (properties_lock); #ifdef G_OS_UNIX ret = g_dbus_connection_call_with_unix_fd_list_sync (proxy->priv->connection, destination, proxy->priv->object_path, target_interface_name, target_method_name, parameters, reply_type, flags, timeout_msec == -1 ? proxy->priv->timeout_msec : timeout_msec, fd_list, out_fd_list, cancellable, error); #else ret = g_dbus_connection_call_sync (proxy->priv->connection, destination, proxy->priv->object_path, target_interface_name, target_method_name, parameters, reply_type, flags, timeout_msec == -1 ? proxy->priv->timeout_msec : timeout_msec, cancellable, error); #endif out: if (reply_type != NULL) g_variant_type_free (reply_type); g_free (destination); g_free (split_interface_name); return ret; } /* ---------------------------------------------------------------------------------------------------- */ /** * g_dbus_proxy_call: * @proxy: A #GDBusProxy. * @method_name: Name of method to invoke. * @parameters: (nullable): A #GVariant tuple with parameters for the signal or %NULL if not passing parameters. * @flags: Flags from the #GDBusCallFlags enumeration. * @timeout_msec: The timeout in milliseconds (with %G_MAXINT meaning * "infinite") or -1 to use the proxy default 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 @proxy. * * If @method_name contains any dots, then @name is split into interface and * method name parts. This allows using @proxy for invoking methods on * other interfaces. * * If the #GDBusConnection associated with @proxy is closed then * the operation will fail with %G_IO_ERROR_CLOSED. If * @cancellable is canceled, the operation will fail with * %G_IO_ERROR_CANCELLED. If @parameters contains a value not * compatible with the D-Bus protocol, the operation fails with * %G_IO_ERROR_INVALID_ARGUMENT. * * If the @parameters #GVariant is floating, it is consumed. This allows * convenient 'inline' use of g_variant_new(), e.g.: * |[ * g_dbus_proxy_call (proxy, * "TwoStrings", * g_variant_new ("(ss)", * "Thing One", * "Thing Two"), * G_DBUS_CALL_FLAGS_NONE, * -1, * NULL, * (GAsyncReadyCallback) two_strings_done, * &data); * ]| * * If @proxy has an expected interface (see * #GDBusProxy:g-interface-info) and @method_name is referenced by it, * then the return value is checked against the return type. * * 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_proxy_call_finish() to get the result of * the operation. See g_dbus_proxy_call_sync() for the synchronous * version of this method. * * 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_proxy_call (GDBusProxy *proxy, const gchar *method_name, GVariant *parameters, GDBusCallFlags flags, gint timeout_msec, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data) { g_dbus_proxy_call_internal (proxy, method_name, parameters, flags, timeout_msec, NULL, cancellable, callback, user_data); } /** * g_dbus_proxy_call_finish: * @proxy: A #GDBusProxy. * @res: A #GAsyncResult obtained from the #GAsyncReadyCallback passed to g_dbus_proxy_call(). * @error: Return location for error or %NULL. * * Finishes an operation started with g_dbus_proxy_call(). * * Returns: %NULL if @error is set. Otherwise a #GVariant tuple with * return values. Free with g_variant_unref(). * * Since: 2.26 */ GVariant * g_dbus_proxy_call_finish (GDBusProxy *proxy, GAsyncResult *res, GError **error) { return g_dbus_proxy_call_finish_internal (proxy, NULL, res, error); } /** * g_dbus_proxy_call_sync: * @proxy: A #GDBusProxy. * @method_name: Name of method to invoke. * @parameters: (nullable): A #GVariant tuple with parameters for the signal * or %NULL if not passing parameters. * @flags: Flags from the #GDBusCallFlags enumeration. * @timeout_msec: The timeout in milliseconds (with %G_MAXINT meaning * "infinite") or -1 to use the proxy default timeout. * @cancellable: (nullable): A #GCancellable or %NULL. * @error: Return location for error or %NULL. * * Synchronously invokes the @method_name method on @proxy. * * If @method_name contains any dots, then @name is split into interface and * method name parts. This allows using @proxy for invoking methods on * other interfaces. * * If the #GDBusConnection associated with @proxy is disconnected then * the operation will fail with %G_IO_ERROR_CLOSED. If * @cancellable is canceled, the operation will fail with * %G_IO_ERROR_CANCELLED. If @parameters contains a value not * compatible with the D-Bus protocol, the operation fails with * %G_IO_ERROR_INVALID_ARGUMENT. * * If the @parameters #GVariant is floating, it is consumed. This allows * convenient 'inline' use of g_variant_new(), e.g.: * |[ * g_dbus_proxy_call_sync (proxy, * "TwoStrings", * g_variant_new ("(ss)", * "Thing One", * "Thing Two"), * G_DBUS_CALL_FLAGS_NONE, * -1, * NULL, * &error); * ]| * * The calling thread is blocked until a reply is received. See * g_dbus_proxy_call() for the asynchronous version of this * method. * * If @proxy has an expected interface (see * #GDBusProxy:g-interface-info) and @method_name is referenced by it, * then the return value is checked against the return type. * * Returns: %NULL if @error is set. Otherwise a #GVariant tuple with * return values. Free with g_variant_unref(). * * Since: 2.26 */ GVariant * g_dbus_proxy_call_sync (GDBusProxy *proxy, const gchar *method_name, GVariant *parameters, GDBusCallFlags flags, gint timeout_msec, GCancellable *cancellable, GError **error) { return g_dbus_proxy_call_sync_internal (proxy, method_name, parameters, flags, timeout_msec, NULL, NULL, cancellable, error); } /* ---------------------------------------------------------------------------------------------------- */ #ifdef G_OS_UNIX /** * g_dbus_proxy_call_with_unix_fd_list: * @proxy: A #GDBusProxy. * @method_name: Name of method to invoke. * @parameters: (nullable): A #GVariant tuple with parameters for the signal or %NULL if not passing parameters. * @flags: Flags from the #GDBusCallFlags enumeration. * @timeout_msec: The timeout in milliseconds (with %G_MAXINT meaning * "infinite") or -1 to use the proxy default 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_proxy_call() but also takes a #GUnixFDList object. * * This method is only available on UNIX. * * Since: 2.30 */ void g_dbus_proxy_call_with_unix_fd_list (GDBusProxy *proxy, const gchar *method_name, GVariant *parameters, GDBusCallFlags flags, gint timeout_msec, GUnixFDList *fd_list, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data) { g_dbus_proxy_call_internal (proxy, method_name, parameters, flags, timeout_msec, fd_list, cancellable, callback, user_data); } /** * g_dbus_proxy_call_with_unix_fd_list_finish: * @proxy: A #GDBusProxy. * @out_fd_list: (out) (optional): Return location for a #GUnixFDList or %NULL. * @res: A #GAsyncResult obtained from the #GAsyncReadyCallback passed to g_dbus_proxy_call_with_unix_fd_list(). * @error: Return location for error or %NULL. * * Finishes an operation started with g_dbus_proxy_call_with_unix_fd_list(). * * Returns: %NULL if @error is set. Otherwise a #GVariant tuple with * return values. Free with g_variant_unref(). * * Since: 2.30 */ GVariant * g_dbus_proxy_call_with_unix_fd_list_finish (GDBusProxy *proxy, GUnixFDList **out_fd_list, GAsyncResult *res, GError **error) { return g_dbus_proxy_call_finish_internal (proxy, out_fd_list, res, error); } /** * g_dbus_proxy_call_with_unix_fd_list_sync: * @proxy: A #GDBusProxy. * @method_name: Name of method to invoke. * @parameters: (nullable): A #GVariant tuple with parameters for the signal * or %NULL if not passing parameters. * @flags: Flags from the #GDBusCallFlags enumeration. * @timeout_msec: The timeout in milliseconds (with %G_MAXINT meaning * "infinite") or -1 to use the proxy default timeout. * @fd_list: (nullable): A #GUnixFDList or %NULL. * @out_fd_list: (out) (optional): Return location for a #GUnixFDList or %NULL. * @cancellable: (nullable): A #GCancellable or %NULL. * @error: Return location for error or %NULL. * * Like g_dbus_proxy_call_sync() but also takes and returns #GUnixFDList objects. * * This method is only available on UNIX. * * Returns: %NULL if @error is set. Otherwise a #GVariant tuple with * return values. Free with g_variant_unref(). * * Since: 2.30 */ GVariant * g_dbus_proxy_call_with_unix_fd_list_sync (GDBusProxy *proxy, const gchar *method_name, GVariant *parameters, GDBusCallFlags flags, gint timeout_msec, GUnixFDList *fd_list, GUnixFDList **out_fd_list, GCancellable *cancellable, GError **error) { return g_dbus_proxy_call_sync_internal (proxy, method_name, parameters, flags, timeout_msec, fd_list, out_fd_list, cancellable, error); } #endif /* G_OS_UNIX */ /* ---------------------------------------------------------------------------------------------------- */ static GDBusInterfaceInfo * _g_dbus_proxy_get_info (GDBusInterface *interface) { GDBusProxy *proxy = G_DBUS_PROXY (interface); return g_dbus_proxy_get_interface_info (proxy); } static GDBusObject * _g_dbus_proxy_get_object (GDBusInterface *interface) { GDBusProxy *proxy = G_DBUS_PROXY (interface); return proxy->priv->object; } static GDBusObject * _g_dbus_proxy_dup_object (GDBusInterface *interface) { GDBusProxy *proxy = G_DBUS_PROXY (interface); GDBusObject *ret = NULL; G_LOCK (properties_lock); if (proxy->priv->object != NULL) ret = g_object_ref (proxy->priv->object); G_UNLOCK (properties_lock); return ret; } static void _g_dbus_proxy_set_object (GDBusInterface *interface, GDBusObject *object) { GDBusProxy *proxy = G_DBUS_PROXY (interface); G_LOCK (properties_lock); if (proxy->priv->object != NULL) g_object_remove_weak_pointer (G_OBJECT (proxy->priv->object), (gpointer *) &proxy->priv->object); proxy->priv->object = object; if (proxy->priv->object != NULL) g_object_add_weak_pointer (G_OBJECT (proxy->priv->object), (gpointer *) &proxy->priv->object); G_UNLOCK (properties_lock); } static void dbus_interface_iface_init (GDBusInterfaceIface *dbus_interface_iface) { dbus_interface_iface->get_info = _g_dbus_proxy_get_info; dbus_interface_iface->get_object = _g_dbus_proxy_get_object; dbus_interface_iface->dup_object = _g_dbus_proxy_dup_object; dbus_interface_iface->set_object = _g_dbus_proxy_set_object; } /* ---------------------------------------------------------------------------------------------------- */