From b898e07066dc02f6a7cdf7b45f582c6263beb20c Mon Sep 17 00:00:00 2001
From: Frank Denis <github@pureftpd.org>
Date: Thu, 6 Apr 2023 14:18:38 +0200
Subject: [PATCH] A source URL may have an IP address that doesn't exist any
 more

---
 dnscrypt-proxy/xtransport.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/dnscrypt-proxy/xtransport.go b/dnscrypt-proxy/xtransport.go
index bc50d5fd..b4457257 100644
--- a/dnscrypt-proxy/xtransport.go
+++ b/dnscrypt-proxy/xtransport.go
@@ -9,6 +9,7 @@ import (
 	"encoding/base64"
 	"encoding/hex"
 	"errors"
+	"fmt"
 	"io"
 	"math/rand"
 	"net"
@@ -415,6 +416,9 @@ func (xTransport *XTransport) resolveAndUpdateCache(host string) error {
 			return err
 		}
 	}
+	if foundIP == nil {
+		return fmt.Errorf("no IP address found for [%s]", host)
+	}
 	xTransport.saveCachedIP(host, foundIP, ttl)
 	dlog.Debugf("[%s] IP address [%s] added to the cache, valid for %v", host, foundIP, ttl)
 	return nil