dbus: Do send out "replies" to signals

Some parts of systemd (at least the DBus activation codepath) "reply"
to signals, which of course have the no-reply flag set.  We will be
defensive here and still send out a reply if we're passed a signal.

Regression introduced by: c6a818c82035da91e

Reported-by: Mantas Mikulėnas <grawity@gmail.com>
Tested-by: Mantas Mikulėnas <grawity@gmail.com>

diff --git a/src/shared/dbus-common.c b/src/shared/dbus-common.c
index 2769b2c882e2081a153934c56cdfba46b1d5514f..0e38933d8abba49a65463ad6b46ffa4c6d186375 100644 (file)
--- a/src/shared/dbus-common.c
+++ b/src/shared/dbus-common.c
@@ -717,9 +717,14 @@ dbus_bool_t bus_maybe_send_reply (DBusConnection   *c,
                                   DBusMessage *message,
                                   DBusMessage *reply)
 {
-        if (dbus_message_get_no_reply (message))
+        /* Some parts of systemd "reply" to signals, which of course
+         * have the no-reply flag set.  We will be defensive here and
+         * still send out a reply if we're passed a signal.
+         */
+        if (dbus_message_get_type(message) == DBUS_MESSAGE_TYPE_METHOD_CALL &&
+            dbus_message_get_no_reply(message))
                 return TRUE;
-        return dbus_connection_send (c, reply, NULL);
+        return dbus_connection_send(c, reply, NULL);
 }
 
 DBusHandlerResult bus_send_error_reply(DBusConnection *c, DBusMessage *message, DBusError *berror, int error) {