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Merge branch 'track-bus-name-owners-for-signal-subscriptions' into 'main'

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Track bus name owners for signal subscriptions

See merge request GNOME/Security/glib!1
This commit is contained in:
Ray Strode 2024-05-01 13:34:40 +00:00
commit c7caf98646
4 changed files with 1919 additions and 133 deletions
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701
gio/gdbusconnection.c
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@ -287,6 +287,153 @@ call_destroy_notify (GMainContext *context,
/* ---------------------------------------------------------------------------------------------------- */
typedef struct
{
/* All fields are immutable after construction. */
gatomicrefcount ref_count;
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
@ -405,6 +552,7 @@ struct _GDBusConnection
/* 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 */
@ -653,6 +801,7 @@ g_dbus_connection_finalize (GObject *object)
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);
@ -1039,6 +1188,7 @@ g_dbus_connection_init (GDBusConnection *connection)
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);
@ -2167,6 +2317,191 @@ g_dbus_connection_send_message_with_reply_sync (GDBusConnection *connecti
/* ---------------------------------------------------------------------------------------------------- */
/*
* 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);
if (G_LIKELY (new_owner[0] == '\0' || g_dbus_is_unique_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),
"org.freedesktop.DBus.Error.NameHasNoOwner"))
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);
if (G_LIKELY (g_dbus_is_unique_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;
@ -2290,6 +2625,7 @@ on_worker_message_received (GDBusWorker *worker,
{
guint32 reply_serial;
GTask *task;
SignalData *name_watcher;
reply_serial = g_dbus_message_get_reply_serial (message);
CONNECTION_LOCK (connection);
@ -2305,6 +2641,19 @@ on_worker_message_received (GDBusWorker *worker,
{
//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)
@ -3248,69 +3597,6 @@ g_dbus_connection_remove_filter (GDBusConnection *connection,
/* ---------------------------------------------------------------------------------------------------- */
typedef struct
{
gchar *rule;
gchar *sender;
gchar *sender_unique_name; /* if sender is unique or org.freedesktop.DBus, then that name... otherwise blank */
gchar *interface_name;
gchar *member;
gchar *object_path;
gchar *arg0;
GDBusSignalFlags flags;
GPtrArray *subscribers; /* (owned) (element-type SignalSubscriber) */
} SignalData;
static void
signal_data_free (SignalData *signal_data)
{
g_free (signal_data->rule);
g_free (signal_data->sender);
g_free (signal_data->sender_unique_name);
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);
}
typedef struct
{
/* All fields are immutable after construction. */
gatomicrefcount ref_count;
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);
}
}
static gchar *
args_to_rule (const gchar *sender,
const gchar *interface_name,
@ -3422,7 +3708,7 @@ remove_match_rule (GDBusConnection *connection,
static gboolean
is_signal_data_for_name_lost_or_acquired (SignalData *signal_data)
{
return g_strcmp0 (signal_data->sender_unique_name, "org.freedesktop.DBus") == 0 &&
return g_strcmp0 (signal_data->sender, "org.freedesktop.DBus") == 0 &&
g_strcmp0 (signal_data->interface_name, "org.freedesktop.DBus") == 0 &&
g_strcmp0 (signal_data->object_path, "/org/freedesktop/DBus") == 0 &&
(g_strcmp0 (signal_data->member, "NameLost") == 0 ||
@ -3431,6 +3717,43 @@ is_signal_data_for_name_lost_or_acquired (SignalData *signal_data)
/* ---------------------------------------------------------------------------------------------------- */
/* 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
@ -3519,8 +3842,9 @@ g_dbus_connection_signal_subscribe (GDBusConnection *connection,
{
gchar *rule;
SignalData *signal_data;
SignalData *name_watcher = NULL;
SignalSubscriber *subscriber;
GPtrArray *signal_data_array;
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
@ -3556,6 +3880,11 @@ g_dbus_connection_signal_subscribe (GDBusConnection *connection,
rule = args_to_rule (sender, interface_name, member, object_path, arg0, flags);
if (sender != NULL && (g_dbus_is_unique_name (sender) || g_strcmp0 (sender, "org.freedesktop.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 = "";
@ -3577,43 +3906,62 @@ g_dbus_connection_signal_subscribe (GDBusConnection *connection,
goto out;
}
signal_data = g_new0 (SignalData, 1);
signal_data->rule = rule;
signal_data->sender = g_strdup (sender);
signal_data->sender_unique_name = g_strdup (sender_unique_name);
signal_data->interface_name = g_strdup (interface_name);
signal_data->member = g_strdup (member);
signal_data->object_path = g_strdup (object_path);
signal_data->arg0 = g_strdup (arg0);
signal_data->flags = flags;
signal_data->subscribers = g_ptr_array_new_with_free_func ((GDestroyNotify) signal_subscriber_unref);
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);
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 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)
{
if (!is_signal_data_for_name_lost_or_acquired (signal_data))
add_match_rule (connection, signal_data->rule);
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);
}
signal_data_array = g_hash_table_lookup (connection->map_sender_unique_name_to_signal_data_array,
signal_data->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 (signal_data->sender_unique_name),
signal_data_array);
}
g_ptr_array_add (signal_data_array, signal_data);
add_signal_data (connection, signal_data, sender_unique_name);
out:
g_hash_table_insert (connection->map_id_to_signal_data,
@ -3627,6 +3975,75 @@ g_dbus_connection_signal_subscribe (GDBusConnection *connection,
/* ---------------------------------------------------------------------------------------------------- */
/*
* 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 */
@ -3635,7 +4052,6 @@ unsubscribe_id_internal (GDBusConnection *connection,
guint subscription_id)
{
SignalData *signal_data;
GPtrArray *signal_data_array;
guint n;
guint n_removed = 0;
@ -3662,40 +4078,8 @@ unsubscribe_id_internal (GDBusConnection *connection,
GUINT_TO_POINTER (subscription_id)));
n_removed++;
g_ptr_array_remove_index_fast (signal_data->subscribers, n);
if (signal_data->subscribers->len == 0)
{
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,
signal_data->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,
signal_data->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);
}
signal_data_free (signal_data);
}
/* May free signal_data */
remove_signal_data_if_unused (connection, signal_data);
goto out;
}
@ -3916,6 +4300,46 @@ schedule_callbacks (GDBusConnection *connection,
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)
@ -3933,6 +4357,17 @@ schedule_callbacks (GDBusConnection *connection,
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];
@ -4004,7 +4439,7 @@ distribute_signals (GDBusConnection *connection,
schedule_callbacks (connection, signal_data_array, message, sender);
}
/* collect subscribers not matching on 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);

5
gio/gdbusprivate.h
View File

@ -27,6 +27,11 @@
G_BEGIN_DECLS
/* Bus name, interface and object path of the message bus itself */
#define DBUS_SERVICE_DBUS "org.freedesktop.DBus"
#define DBUS_INTERFACE_DBUS DBUS_SERVICE_DBUS
#define DBUS_PATH_DBUS "/org/freedesktop/DBus"
/* ---------------------------------------------------------------------------------------------------- */
typedef struct GDBusWorker GDBusWorker;

1342
gio/tests/gdbus-subscribe.c Normal file
View File

File diff suppressed because it is too large Load Diff

4
gio/tests/meson.build
View File

@ -493,6 +493,10 @@ if host_machine.system() != 'windows'
'extra_sources' : extra_sources,
'extra_programs': extra_programs,
},
'gdbus-subscribe' : {
'extra_sources' : extra_sources,
'extra_programs': extra_programs,
},
'gdbus-test-codegen' : {
'extra_sources' : [extra_sources, gdbus_test_codegen_generated, gdbus_test_codegen_generated_interface_info],
'c_args' : ['-DGLIB_VERSION_MIN_REQUIRED=GLIB_VERSION_2_32'],