Decode partial domain name labels

Signed-off-by: Erik Geiser <erik.geiser@redteam-pentesting.de>

1 files changed, 8 insertions, 0 deletions

diff --git a/rfc1035label/label.go b/rfc1035label/label.go
index 5a67d7c..561008e 100644
--- a/rfc1035label/label.go
+++ b/rfc1035label/label.go
@@ -100,6 +100,14 @@ func labelsFromBytes(buf []byte) ([]string, error) {
 
 	for {
 		if pos >= len(buf) {
+			// interpret label without trailing zero-length byte as a partial
+			// domain name field as per RFC 4704 Section 4.2
+			if label != "" {
+				labels = append(labels, label)
+
+				return labels, nil
+			}
+
 			break
 		}
 		length := int(buf[pos])