From 5af1be33564d7dbe70b464a562a2e23e0c3e84be Mon Sep 17 00:00:00 2001
From: konradh <49533343+konradh@users.noreply.github.com>
Date: Wed, 24 Jan 2024 20:27:51 +0100
Subject: [PATCH] fix: allow clearing ndp.spoof.neighbour to disable neighbor
 advertisements

---
 modules/ndp_spoof/ndp_spoof.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/modules/ndp_spoof/ndp_spoof.go b/modules/ndp_spoof/ndp_spoof.go
index 86d4130f..f542da90 100644
--- a/modules/ndp_spoof/ndp_spoof.go
+++ b/modules/ndp_spoof/ndp_spoof.go
@@ -36,7 +36,7 @@ func NewNDPSpoofer(s *session.Session) *NDPSpoofer {
 
 	mod.AddParam(session.NewStringParameter("ndp.spoof.neighbour",
 		"fe80::1",
-		session.IPv6Validator,
+		`^([:a-fA-F0-9]{6,})?$`,
 		"Neighbour IPv6 address to spoof, clear to disable NA."))
 
 	mod.AddParam(session.NewStringParameter("ndp.spoof.prefix", "d00d::", "",
@@ -99,6 +99,8 @@ func (mod *NDPSpoofer) Configure() error {
 	} else {
 		if err, neigh = mod.StringParam("ndp.spoof.neighbour"); err != nil {
 			return err
+		} else if neigh == "" {
+			mod.neighbour = nil
 		} else if mod.neighbour = net.ParseIP(neigh); mod.neighbour == nil {
 			return fmt.Errorf("can't parse neighbour address %s", neigh)
 		}