From db5719e22fac3ec80d5aabf3647b76f89e48703a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E4=B8=96=E7=95=8C?= <i@sekai.icu>
Date: Tue, 20 Aug 2024 23:17:02 +0800
Subject: [PATCH] Fix no error return when empty DNS cache retrieved

---
 route/router_dns.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/route/router_dns.go b/route/router_dns.go
index a8c4f441..e0055009 100644
--- a/route/router_dns.go
+++ b/route/router_dns.go
@@ -188,6 +188,9 @@ func (r *Router) Lookup(ctx context.Context, domain string, strategy dns.DomainS
 	)
 	responseAddrs, cached = r.dnsClient.LookupCache(ctx, domain, strategy)
 	if cached {
+		if len(responseAddrs) == 0 {
+			return nil, dns.RCodeNameError
+		}
 		return responseAddrs, nil
 	}
 	r.dnsLogger.DebugContext(ctx, "lookup domain ", domain)