eap-dynamic: Publish the get_auth() method of the wrapped EAP method

Fixes #2238.

src/libcharon/plugins/eap_dynamic/eap_dynamic.c

@@ -94,6 +94,13 @@ static eap_method_t *load_method(private_eap_dynamic_t *this,
 	return method;
 }
 
+METHOD(eap_method_t, get_auth, auth_cfg_t*,
+	private_eap_dynamic_t *this)
+{
+	/* get_auth() is only registered if the EAP method supports it */
+	return this->method->get_auth(this->method);
+}
+
 /**
  * Select the first method we can instantiate and is supported by both peers.
  */
@@ -135,6 +142,10 @@ static void select_method(private_eap_dynamic_t *this)
 		this->method = load_method(this, entry->type, entry->vendor);
 		if (this->method)
 		{
+			if (this->method->get_auth)
+			{
+				this->public.interface.get_auth = _get_auth;
+			}
 			if (entry->vendor)
 			{
 				DBG1(DBG_IKE, "vendor specific EAP method %d-%d selected",
@@ -211,6 +222,7 @@ METHOD(eap_method_t, process, status_t,
 		/* restart with a different method */
 		this->method->destroy(this->method);
 		this->method = NULL;
+		this->public.interface.get_auth = NULL;
 		return initiate(this, out);
 	}
 	if (!this->other_types)