From 108b7f84465dcf595a02062a2f39fc7089a78749 Mon Sep 17 00:00:00 2001
From: Vladimir Bauer <vbauerster@gmail.com>
Date: Thu, 17 Oct 2019 20:29:08 +0500
Subject: [PATCH] fix panic if dns.RR is not a *dns.TXT

---
 dnscrypt-proxy/dnscrypt_certs.go | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/dnscrypt-proxy/dnscrypt_certs.go b/dnscrypt-proxy/dnscrypt_certs.go
index d3a115dc..dd79a120 100644
--- a/dnscrypt-proxy/dnscrypt_certs.go
+++ b/dnscrypt-proxy/dnscrypt_certs.go
@@ -43,7 +43,14 @@ func FetchCurrentDNSCryptCert(proxy *Proxy, serverName *string, proto string, pk
 	highestSerial := uint32(0)
 	var certCountStr string
 	for _, answerRr := range in.Answer {
-		binCert, err := packTxtString(strings.Join(answerRr.(*dns.TXT).Txt, ""))
+		var txt string
+		if t, ok := answerRr.(*dns.TXT); !ok {
+			dlog.Warnf("[%v] Certificate not found", providerName)
+			continue
+		} else {
+			txt = strings.Join(t.Txt, "")
+		}
+		binCert, err := packTxtString(txt)
 		if err != nil {
 			dlog.Warnf("[%v] Unable to unpack the certificate", providerName)
 			continue