auto_id_prefix now defaults to 'auto-'.

ChangeLog.txt

@@ -4,6 +4,7 @@
 Broker features:
 - Improved general support for broker generated client ids. Removed libuuid
   dependency.
+- auto_id_prefix now defaults to 'auto-'.
 
 Client library features:
 - Add mosquitto_subscribe_multiple() for sending subscriptions to multiple

man/mosquitto.conf.5.xml

@@ -262,7 +262,7 @@
 						<replaceable>true</replaceable>, this option allows you
 						to set a string that will be prefixed to the
 						automatically generated client ids to aid visibility in
-						logs. Defaults to no prefix.</para>
+						logs. Defaults to <option>auto-</option>.</para>
 					<para>Reloaded on reload signal.</para>
 				</listitem>
 			</varlistentry>

mosquitto.conf

@@ -89,7 +89,8 @@
 
 # If allow_zero_length_clientid is true, this option allows you to set a prefix
 # to automatically generated client ids to aid visibility in logs.
-#auto_id_prefix
+# Defaults to 'auto-'
+#auto_id_prefix auto-
 
 # This option allows persistent clients (those with clean session set to false)
 # to be removed if they do not reconnect within a certain time frame.

src/conf.c

@@ -2066,8 +2066,10 @@ static int config__check(struct mosquitto__config *config)
 {
 	/* Checks that are easy to make after the config has been loaded. */
 
+	int i;
+
 #ifdef WITH_BRIDGE
-	int i, j;
+	int j;
 	struct mosquitto__bridge *bridge1, *bridge2;
 	char hostname[256];
 	int len;
@@ -2115,6 +2117,28 @@ static int config__check(struct mosquitto__config *config)
 		}
 	}
 #endif
+
+	/* Default to auto_id_prefix = 'auto-' if none set. */
+	if(config->per_listener_settings){
+		for(i=0; i<config->listener_count; i++){
+			if(!config->listeners[i].security_options.auto_id_prefix){
+				config->listeners[i].security_options.auto_id_prefix = mosquitto__strdup("auto-");
+				if(!config->listeners[i].security_options.auto_id_prefix){
+					return MOSQ_ERR_NOMEM;
+				}
+				config->listeners[i].security_options.auto_id_prefix_len = strlen("auto-");
+			}
+		}
+	}else{
+		if(!config->security_options.auto_id_prefix){
+			config->security_options.auto_id_prefix = mosquitto__strdup("auto-");
+			if(!config->security_options.auto_id_prefix){
+				return MOSQ_ERR_NOMEM;
+			}
+			config->security_options.auto_id_prefix_len = strlen("auto-");
+		}
+	}
+
 	return MOSQ_ERR_SUCCESS;
 }