Added an identity getter to XAuth methods to query the actually used identity

src/libcharon/sa/authenticators/xauth/xauth_method.h

@@ -80,6 +80,13 @@ struct xauth_method_t {
 	status_t (*process) (xauth_method_t *this, cp_payload_t *in,
 						 cp_payload_t **out);
 
+	/**
+	 * Get the XAuth username received as XAuth initiator.
+	 *
+	 * @return			used XAuth username, pointer to internal data
+	 */
+	identification_t* (*get_identity)(xauth_method_t *this);
+
 	/**
 	 * Destroys a eap_method_t object.
 	 */