From d25b8afe68c8bcac1a85a77c5f9459a8cb8acc8d Mon Sep 17 00:00:00 2001
From: Herman Slatman <hermanslatman@hotmail.com>
Date: Thu, 20 Oct 2022 01:18:34 +0200
Subject: [PATCH] Add CNAME chasing for TXT records

---
 acme/client.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/acme/client.go b/acme/client.go
index 51560cb8..c6259d5f 100644
--- a/acme/client.go
+++ b/acme/client.go
@@ -72,7 +72,12 @@ func (c *client) Get(url string) (*http.Response, error) {
 }
 
 func (c *client) LookupTxt(name string) ([]string, error) {
-	return net.LookupTXT(name)
+	// chase CNAME records, if any
+	cname, err := net.LookupCNAME(name)
+	if err != nil {
+		return nil, err
+	}
+	return net.LookupTXT(cname)
 }
 
 func (c *client) TLSDial(network, addr string, config *tls.Config) (*tls.Conn, error) {