cacheseconds == 0 disables cache

README.md

@@ -120,7 +120,7 @@ The following `auth_opt_` options are supported by the mysql back-end:
 | mysql_opt_reconnect | true | | enable MYSQL_OPT_RECONNECT option
 | mysql_auto_connect | true | | enable auto_connect function
 | anonusername | | | username to use for anonymous connections
-| cacheseconds  | 300 | | number of seconds to cache ACL lookups
+| cacheseconds | 300 | | number of seconds to cache ACL lookups. 0 disables
 
 The SQL query for looking up a user's password hash is mandatory. The query
 MUST return a single row only (any other number of rows is considered to be

cache.c

@@ -92,6 +92,10 @@ void acl_cache(const char *clientid, const char *username, const char *topic, in
  time_t cacheseconds = ud->cacheseconds;
  time_t now;
 
+ if (ud->cacheseconds <= 0) {
+ return;
+ }
+
  now = time(NULL);
 
  hexify(clientid, username, topic, access, hex);
@@ -134,6 +138,9 @@ int cache_q(const char *clientid, const char *username, const char *topic, int a
  time_t cacheseconds = ud->cacheseconds;
  int granted = MOSQ_ERR_UNKNOWN;
 
+ if (ud->cacheseconds <= 0) {
+ return (MOSQ_ERR_UNKNOWN);
+ }
  hexify(clientid, username, topic, access, hex);
 
  HASH_FIND_STR(ud->aclcache, hex, a);