fix: v2ray dns usage

db/ConfigBuilder.cpp

@@ -275,6 +275,7 @@ namespace NekoRay {
         }
         dnsServers += QJsonObject{
             {"address", directDnsAddress},
+            {"fallbackStrategy", "disabled"},
             {"domains", QList2QJsonArray<QString>(status->domainListDNSDirect)},
         };
 

go/cmd/nekoray_core/core_ray.go

@@ -10,7 +10,9 @@ import (
 	"net/http"
 	"time"
 
+	"github.com/sirupsen/logrus"
 	v2rayNet "github.com/v2fly/v2ray-core/v5/common/net"
+	"github.com/v2fly/v2ray-core/v5/features/dns"
 	"github.com/v2fly/v2ray-core/v5/features/dns/localdns"
 )
 
@@ -25,7 +27,14 @@ func setupCore() {
 	// localdns setup
 	resolver_def := &net.Resolver{PreferGo: false}
 	resolver_go := &net.Resolver{PreferGo: true}
-	localdns.SetLookupFunc(func(network string, host string) ([]net.IP, error) {
+	localdns.SetLookupFunc(func(network string, host string) (ips []net.IP, err error) {
+		// fix old sekai
+		defer func() {
+			if len(ips) == 0 {
+				logrus.Println("LookupIP error:", err)
+				err = dns.ErrEmptyResponse
+			}
+		}()
 		// Normal mode use system resolver (go bug)
 		if getNekorayTunIndex() == 0 {
 			return resolver_def.LookupIP(context.Background(), network, host)