auth method needs persisting.

include/mosquitto_broker.h

@@ -215,9 +215,11 @@ struct mosquitto_evt_persist_restore {
 struct mosquitto_evt_persist_client {
 	const char *client_id;
 	const char *username;
+	const char *auth_method;
 	const struct mosquitto_message_v5 *will;
 	char *plugin_client_id;
 	char *plugin_username;
+	char *plugin_auth_method;
 	struct mosquitto_message_v5 *plugin_will;
 	time_t will_delay_time; /* update */
 	time_t session_expiry_time; /* update */

src/plugin_persist.c

@@ -57,6 +57,7 @@ void plugin_persist__handle_client_add(struct mosquitto *context)
 	memset(&event_data, 0, sizeof(event_data));
 	event_data.client_id = context->id;
 	event_data.username = context->username;
+	event_data.auth_method = context->auth_method;
 	event_data.will_delay_time = context->will_delay_time;
 	event_data.session_expiry_time = context->session_expiry_time;
 	event_data.will_delay_interval = context->will_delay_interval;
@@ -88,6 +89,7 @@ void plugin_persist__handle_client_update(struct mosquitto *context)
 	memset(&event_data, 0, sizeof(event_data));
 	event_data.client_id = context->id;
 	event_data.username = context->username;
+	event_data.auth_method = context->auth_method;
 	event_data.will_delay_time = context->will_delay_time;
 	event_data.session_expiry_time = context->session_expiry_time;
 	event_data.will_delay_interval = context->will_delay_interval;

src/plugin_public.c

@@ -413,6 +413,17 @@ int mosquitto_persist_client_add(const struct mosquitto_evt_persist_client *clie
 	}else{
 		context->username = NULL;
 	}
+	if(client->auth_method){
+		context->auth_method = mosquitto__strdup(client->plugin_auth_method);
+		if(!context->auth_method){
+			mosquitto__free(context->username);
+			mosquitto__free(context->id);
+			mosquitto__free(context);
+			return MOSQ_ERR_NOMEM;
+		}
+	}else{
+		context->auth_method = NULL;
+	}
 	context->clean_start = false;
 	context->will_delay_time = client->will_delay_time;
 	context->session_expiry_time = client->session_expiry_time;