Add clients to session expiry check list when restarting and reloading from persistence.

Closes #2546. Thanks to Joachim Schachermayer.

ChangeLog.txt

@@ -11,6 +11,8 @@ Broker:
   required for MQTT v3.1. Closes #2522.
 - Improve documentation of `persistent_client_expiration` option.
   Closes #2404.
+- Add clients to session expiry check list when restarting and reloading from
+  persistence. Closes #2546.
 
 Client library:
 - Fix threads library detection on Windows under cmake. Bumps the minimum

src/mosquitto_broker_internal.h

@@ -818,6 +818,7 @@ void unpwd__free_item(struct mosquitto__unpwd **unpwd, struct mosquitto__unpwd *
  * Session expiry
  * ============================================================ */
 int session_expiry__add(struct mosquitto *context);
+int session_expiry__add_from_persistence(struct mosquitto *context, time_t expiry_time);
 void session_expiry__remove(struct mosquitto *context);
 void session_expiry__remove_all(void);
 void session_expiry__check(void);

src/persist_read.c

@@ -208,7 +208,7 @@ static int persist__client_chunk_restore(FILE *db_fptr)
 				}
 			}
 		}
-		/* FIXME - we should expire clients here if they have exceeded their time */
+		session_expiry__add_from_persistence(context, chunk.F.session_expiry_time);
 	}else{
 		rc = 1;
 	}

src/session_expiry.c

@@ -82,6 +82,23 @@ int session_expiry__add(struct mosquitto *context)
 }
 
 
+int session_expiry__add_from_persistence(struct mosquitto *context, time_t expiry_time)
+{
+	struct session_expiry_list *item;
+
+	item = mosquitto__calloc(1, sizeof(struct session_expiry_list));
+	if(!item) return MOSQ_ERR_NOMEM;
+
+	item->context = context;
+	item->context->session_expiry_time = expiry_time;
+	context->expiry_list_item = item;
+
+	DL_INSERT_INORDER(expiry_list, item, session_expiry__cmp);
+
+	return MOSQ_ERR_SUCCESS;
+}
+
+
 void session_expiry__remove(struct mosquitto *context)
 {
 	if(context->expiry_list_item){