Add and fix port range rules and update documentation for it

profile/endpoints/endpoint.go

@@ -154,6 +154,9 @@ func (ep *EndpointBase) parsePPP(typedEp Endpoint, fields []string) (Endpoint, e
 						return nil, invalidDefinitionError(fields, "port number parsing error")
 					}
 				}
+				if n16 == 0 {
+					return nil, invalidDefinitionError(fields, "port number cannot be 0")
+				}
 				ep.StartPort = n16
 				// parse end port
 				if len(portSplitted) > 1 {
@@ -167,6 +170,9 @@ func (ep *EndpointBase) parsePPP(typedEp Endpoint, fields []string) (Endpoint, e
 						}
 					}
 				}
+				if n16 == 0 {
+					return nil, invalidDefinitionError(fields, "port number cannot be 0")
+				}
 				ep.EndPort = n16
 			}
 		}

profile/endpoints/reason.go

@@ -26,7 +26,7 @@ func (r *reason) String() string {
 		prefix = "allowed by rule: "
 	}
 
-	return prefix + r.description + " " + r.Value
+	return prefix + r.description + " " + r.Filter[2:]
 }
 
 func (r *reason) Context() interface{} {