Custom filter list:

subdomain and cname cheks
Automatic realod when settings is changed
periodicly check for file changes

intel/customlists/config.go

@@ -1,11 +1,15 @@
 package customlists
 
-import "github.com/safing/portbase/config"
+import (
+	"strings"
+
+	"github.com/safing/portbase/config"
+)
 
 var (
 	// CfgOptionCustomListBlockingKey is the config key for the listen address..
 	CfgOptionCustomListBlockingKey        = "filter/customListBlocking"
-	cfgOptionCustomListBlockingOrder      = 37
+	cfgOptionCustomListBlockingOrder      = 35
 	cfgOptionCustomListCategoryAnnotation = "Filter Lists"
 )
 
@@ -14,11 +18,35 @@ var (
 )
 
 func registerConfig() error {
+	help := strings.ReplaceAll(`Put all domains, Ip addresses, country codes and autonomous system that you want to block in a file in which each entry is on a new line.  
+	Lines that start with a '#' symbol are ignored.  
+	Everything after the first space/tab is ignored.  
+	Example:  
+"""
+# Domains:  
+example.com  
+google.com  
+  
+# IP addresses  
+1.2.3.4  
+4.3.2.1  
+  
+# Countries  
+AU  
+BG  
+  
+# Autonomous Systems  
+AS123  
+"""
+> * All the records are stored in RAM, careful with large block lists.  
+> * Hosts files are not supported.`, "\"", "`")
+
 	// register a setting for the file path in the ui
 	err := config.Register(&config.Option{
 		Name:            "Custom Filter List",
 		Key:             CfgOptionCustomListBlockingKey,
 		Description:     "Path to the file that contains a list of Domain, IP addresses, country codes and autonomous systems that you want to block",
+		Help:            help,
 		OptType:         config.OptTypeString,
 		ExpertiseLevel:  config.ExpertiseLevelExpert,
 		ReleaseLevel:    config.ReleaseLevelStable,