From 13b70d5543c4a20a702185683b5cea6acb17d86a Mon Sep 17 00:00:00 2001
From: j2rong4cn <253551464@qq.com>
Date: Thu, 1 May 2025 11:40:31 +0800
Subject: [PATCH] fix bug

---
 app/dns/dns.go   | 5 ++++-
 app/dns/hosts.go | 3 +++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/app/dns/dns.go b/app/dns/dns.go
index cd610907..6d810a70 100644
--- a/app/dns/dns.go
+++ b/app/dns/dns.go
@@ -189,7 +189,10 @@ func (s *DNS) LookupIP(domain string, option dns.IPOption) ([]net.IP, uint32, er
 	// Static host lookup
 	switch addrs, err := s.hosts.Lookup(domain, option); {
 	case err != nil:
-		return nil, 0, err
+		if go_errors.Is(err, dns.ErrEmptyResponse) {
+			return nil, 0, dns.ErrEmptyResponse
+		}
+		return nil, 0, errors.New("returning nil for domain ", domain).Base(err)
 	case addrs == nil: // Domain not recorded in static host
 		break
 	case len(addrs) == 0: // Domain recorded, but no valid IP returned (e.g. IPv4 address with only IPv6 enabled)
diff --git a/app/dns/hosts.go b/app/dns/hosts.go
index 3b38268f..b7ce1854 100644
--- a/app/dns/hosts.go
+++ b/app/dns/hosts.go
@@ -86,6 +86,9 @@ func (h *StaticHosts) lookup(domain string, option dns.IPOption, maxDepth int) (
 		return addrs, nil
 	case len(addrs) == 1:
 		if err, ok := addrs[0].(dns.RCodeError); ok {
+			if uint16(err) == 0 {
+				return nil, dns.ErrEmptyResponse
+			}
 			return nil, err
 		}
 		if addrs[0].Family().IsDomain() { // Try to unwrap domain