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authorLucas De Marchi <lucas.demarchi@profusion.mobi>2012-09-27 11:58:58 (GMT)
committerPatrik Flykt <patrik.flykt@linux.intel.com>2012-09-28 12:17:11 (GMT)
commitad7fde7c8aa83b7a789798b1247ed7c02899f1cd (patch)
tree0777be702e1d01a06e143a97a6007ce51129dd98 /gdbus
parent1a7a2357056cc52f554f3d3dee6a246b0c9b094e (diff)
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gdbus: Fix wrong signal handler match
When we add a signal handler with g_dbus_add_signal_watch(), this function tries to multiplex the matches added in libdbus by checking if there's a previous filter_data with the same fields. However, if the field is NULL it accepts as being the same. The result is that the following watches will use the same filter data: watch1 = g_dbus_add_signal_watch(conn, BUS_NAME, NULL, iface, member, cb1, data1, NULL); watch2 = g_dbus_add_signal_watch(conn, BUS_NAME, "/path2", iface, member, cb2, data2, NULL); watch3 = g_dbus_add_signal_watch(conn, BUS_NAME, "/path3", iface, member, cb3, data3, NULL); The result is that when a signal arrives with path == "/path2", all 3 callbacks above will be called, with the same signal delivered to all of them. Another problem is that, if we invert the calls like below, only signals to cb1 will never be trigerred, nonetheless it used path == NULL. watch2 = g_dbus_add_signal_watch(conn, BUS_NAME, "/path2", iface, member, cb2, data2, NULL); watch1 = g_dbus_add_signal_watch(conn, BUS_NAME, NULL, iface, member, cb1, data1, NULL); watch3 = g_dbus_add_signal_watch(conn, BUS_NAME, "/path3", iface, member, cb3, data3, NULL); This is fixed by not multiplexing the matchs with filter data if any of the fields are different, including being NULL. When a signal arrives, if a field is NULL we accept it as a match, but not when adding the signal handler.
Diffstat (limited to 'gdbus')
-rw-r--r--gdbus/watch.c115
1 files changed, 94 insertions, 21 deletions
diff --git a/gdbus/watch.c b/gdbus/watch.c
index d749176..2661928 100644
--- a/gdbus/watch.c
+++ b/gdbus/watch.c
@@ -78,6 +78,47 @@ struct filter_data {
gboolean registered;
};
+static struct filter_data *filter_data_find_match(DBusConnection *connection,
+ const char *name,
+ const char *owner,
+ const char *path,
+ const char *interface,
+ const char *member,
+ const char *argument)
+{
+ GSList *current;
+
+ for (current = listeners;
+ current != NULL; current = current->next) {
+ struct filter_data *data = current->data;
+
+ if (connection != data->connection)
+ continue;
+
+ if (g_strcmp0(name, data->name) != 0)
+ continue;
+
+ if (g_strcmp0(owner, data->owner) != 0)
+ continue;
+
+ if (g_strcmp0(path, data->path) != 0)
+ continue;
+
+ if (g_strcmp0(interface, data->interface) != 0)
+ continue;
+
+ if (g_strcmp0(member, data->member) != 0)
+ continue;
+
+ if (g_strcmp0(argument, data->argument) != 0)
+ continue;
+
+ return data;
+ }
+
+ return NULL;
+}
+
static struct filter_data *filter_data_find(DBusConnection *connection,
const char *name,
const char *owner,
@@ -221,8 +262,8 @@ static struct filter_data *filter_data_get(DBusConnection *connection,
name = sender;
proceed:
- data = filter_data_find(connection, name, owner, path, interface,
- member, argument);
+ data = filter_data_find_match(connection, name, owner, path,
+ interface, member, argument);
if (data)
return data;
@@ -501,6 +542,7 @@ static DBusHandlerResult message_filter(DBusConnection *connection,
{
struct filter_data *data;
const char *sender, *path, *iface, *member, *arg = NULL;
+ GSList *current, *delete_listener = NULL;
/* Only filter signals */
if (dbus_message_get_type(message) != DBUS_MESSAGE_TYPE_SIGNAL)
@@ -512,30 +554,63 @@ static DBusHandlerResult message_filter(DBusConnection *connection,
member = dbus_message_get_member(message);
dbus_message_get_args(message, NULL, DBUS_TYPE_STRING, &arg, DBUS_TYPE_INVALID);
- /* Sender is always bus name */
- data = filter_data_find(connection, NULL, sender, path, iface, member,
- arg);
- if (data == NULL) {
- error("Got %s.%s signal which has no listeners", iface, member);
- return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
- }
+ /* Sender is always the owner */
+
+ for (current = listeners; current != NULL; current = current->next) {
+ data = current->data;
+
+ if (connection != data->connection)
+ continue;
+
+ if (data->owner && g_str_equal(sender, data->owner) == FALSE)
+ continue;
- if (data->handle_func) {
- data->lock = TRUE;
+ if (data->path && g_str_equal(path, data->path) == FALSE)
+ continue;
+
+ if (data->interface && g_str_equal(iface,
+ data->interface) == FALSE)
+ continue;
- data->handle_func(connection, message, data);
+ if (data->member && g_str_equal(member, data->member) == FALSE)
+ continue;
- data->callbacks = data->processed;
- data->processed = NULL;
- data->lock = FALSE;
+ if (data->argument && g_str_equal(arg,
+ data->argument) == FALSE)
+ continue;
+
+ if (data->handle_func) {
+ data->lock = TRUE;
+
+ data->handle_func(connection, message, data);
+
+ data->callbacks = data->processed;
+ data->processed = NULL;
+ data->lock = FALSE;
+ }
+
+ if (!data->callbacks)
+ delete_listener = g_slist_prepend(delete_listener,
+ current);
}
- if (data->callbacks)
- return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
+ for (current = delete_listener; current != NULL;
+ current = delete_listener->next) {
+ GSList *l = current->data;
- remove_match(data);
+ data = l->data;
- listeners = g_slist_remove(listeners, data);
+ /* Has any other callback added callbacks back to this data? */
+ if (data->callbacks != NULL)
+ continue;
+
+ remove_match(data);
+ listeners = g_slist_remove_link(listeners, l);
+
+ filter_data_free(data);
+ }
+
+ g_slist_free(delete_listener);
/* Remove filter if there are no listeners left for the connection */
if (filter_data_find(connection, NULL, NULL, NULL, NULL, NULL,
@@ -543,8 +618,6 @@ static DBusHandlerResult message_filter(DBusConnection *connection,
dbus_connection_remove_filter(connection, message_filter,
NULL);
- filter_data_free(data);
-
return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
}