gchar *(*client_data_send) (GDBusAuthMechanism *mechanism,
gsize *out_data_len);
void (*client_shutdown) (GDBusAuthMechanism *mechanism);
gchar *(*client_data_send) (GDBusAuthMechanism *mechanism,
gsize *out_data_len);
void (*client_shutdown) (GDBusAuthMechanism *mechanism);