From 998a25aa0864d9059c621d10738eeec37ff63662 Mon Sep 17 00:00:00 2001
From: Hampton <me@hampton.pw>
Date: Mon, 3 Jan 2022 10:24:33 -0500
Subject: [PATCH] BUG: Support RFC2317 by allowing slash in CNAME target
 (#1360)

Co-authored-by: Tom Limoncelli <tlimoncelli@stackoverflow.com>
---
 pkg/normalize/validate.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/pkg/normalize/validate.go b/pkg/normalize/validate.go
index 16cd0d6fc..9f3b35ba8 100644
--- a/pkg/normalize/validate.go
+++ b/pkg/normalize/validate.go
@@ -36,7 +36,10 @@ func checkTarget(target string) error {
 	if target == "" {
 		return fmt.Errorf("empty target")
 	}
-	if strings.ContainsAny(target, `'" +,|!£$%&/()=?^*ç°§;:<>[]()@`) {
+	if strings.ContainsAny(target, `'" +,|!£$%&()=?^*ç°§;:<>[]()@`) {
+		return fmt.Errorf("target (%v) includes invalid char", target)
+	}
+	if !strings.HasSuffix(target, ".in-addr.arpa.") && strings.Contains(target, "/") {
 		return fmt.Errorf("target (%v) includes invalid char", target)
 	}
 	// If it contains a ".", it must end in a ".".