From b02649f774ee92d6a436fc12d2b4e82c213426e2 Mon Sep 17 00:00:00 2001
From: Frank Denis <github@pureftpd.org>
Date: Thu, 17 Sep 2020 00:19:00 +0200
Subject: [PATCH] Error out if the dns64 plugin is enabled without listening
 sockets

---
 dnscrypt-proxy/config.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/dnscrypt-proxy/config.go b/dnscrypt-proxy/config.go
index c180b157..86a103d8 100644
--- a/dnscrypt-proxy/config.go
+++ b/dnscrypt-proxy/config.go
@@ -585,6 +585,9 @@ func ConfigLoad(proxy *Proxy, flags *ConfigFlags) error {
 
 	proxy.serversBlockingFragments = config.BrokenImplementations.FragmentsBlocked
 
+	if (len(config.DNS64.Prefixes) != 0 || len(config.DNS64.Resolvers) != 0) && len(config.ListenAddresses) == 0 {
+		dlog.Fatal("`listenAddresses` cannot be empty in order to use DNS64 translation")
+	}
 	proxy.dns64Prefixes = config.DNS64.Prefixes
 	proxy.dns64Resolvers = config.DNS64.Resolvers