Allow to set static to a pointer and add IsIPV6 helper (#1540)

* Allow to set static to a pointer and add IsIPV6 helper

pkg/exprhelpers/exprlib.go

@@ -58,6 +58,7 @@ func GetExprEnv(ctx map[string]interface{}) map[string]interface{} {
 		"XMLGetAttributeValue": XMLGetAttributeValue,
 		"XMLGetNodeValue":      XMLGetNodeValue,
 		"IpToRange":            IpToRange,
+		"IsIPV6":               IsIPV6,
 	}
 	for k, v := range ctx {
 		ExprLib[k] = v
@@ -180,6 +181,17 @@ func IpInRange(ip string, ipRange string) bool {
 	return false
 }
 
+func IsIPV6(ip string) bool {
+	ipParsed := net.ParseIP(ip)
+	if ipParsed == nil {
+		log.Debugf("'%s' is not a valid IP", ip)
+		return false
+	}
+
+	// If it's a valid IP and can't be converted to IPv4 then it is an IPv6
+	return ipParsed.To4() == nil
+}
+
 func IpToRange(ip string, cidr string) string {
 	cidr = strings.TrimPrefix(cidr, "/")
 	mask, err := strconv.Atoi(cidr)

pkg/parser/runtime.go

@@ -17,7 +17,6 @@ import (
 
 	"strconv"
 
-	"github.com/davecgh/go-spew/spew"
 	"github.com/mohae/deepcopy"
 	"github.com/prometheus/client_golang/prometheus"
 	log "github.com/sirupsen/logrus"
@@ -38,7 +37,7 @@ func SetTargetByName(target string, value string, evt *types.Event) bool {
 	log.Debugf("setting target %s to %s", target, value)
 	defer func() {
 		if r := recover(); r != nil {
-			log.Errorf("Runtime error while trying to set '%s' in %s : %+v", target, spew.Sdump(evt), r)
+			log.Errorf("Runtime error while trying to set '%s': %+v", target, r)
 			return
 		}
 	}()
@@ -65,11 +64,17 @@ func SetTargetByName(target string, value string, evt *types.Event) bool {
 		case reflect.Struct:
 			tmp := iter.FieldByName(f)
 			if !tmp.IsValid() {
-				log.Debugf("%s IsValid false", f)
+				log.Debugf("'%s' is not a valid target because '%s' is not valid", target, f)
 				return false
 			}
+			if tmp.Kind() == reflect.Ptr {
+				tmp = reflect.Indirect(tmp)
+			}
 			iter = tmp
 			break
+		case reflect.Ptr:
+			tmp := iter.Elem()
+			iter = reflect.Indirect(tmp.FieldByName(f))
 		default:
 			log.Errorf("unexpected type %s in '%s'", iter.Kind(), target)
 			return false