Refactor UDP DNS hijack

protocol/tailscale/port.go

@@ -6,9 +6,13 @@ import (
 	"net/netip"
 
 	"github.com/sagernet/sing-box/adapter"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/log"
 	"github.com/sagernet/sing-tun"
 	"github.com/sagernet/sing-tun/gtcpip/header"
 	E "github.com/sagernet/sing/common/exceptions"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
 	tsTUN "github.com/sagernet/tailscale/net/tstun"
 	"github.com/sagernet/tailscale/types/ipproto"
 	"github.com/sagernet/tailscale/wgengine/filter"
@@ -67,6 +71,19 @@ func (t *Endpoint) JudgeFlow(network uint8, source netip.AddrPort, destination n
 	return adapter.JudgeFlow(t.router, t.Tag(), t.Type(), network, source, destination, firstPacket)
 }
 
+func (t *Endpoint) NewDNSPacket(payload []byte, source M.Socksaddr, destination M.Socksaddr, writer N.PacketWriter) {
+	ctx := log.ContextWithNewID(t.ctx)
+	var metadata adapter.InboundContext
+	metadata.Inbound = t.Tag()
+	metadata.InboundType = t.Type()
+	metadata.Network = N.NetworkUDP
+	metadata.Source = source
+	metadata.Destination = destination
+	metadata.Protocol = C.ProtocolDNS
+	t.logger.InfoContext(ctx, "inbound DNS packet from ", source)
+	t.router.HijackDNSPacket(ctx, payload, writer, metadata)
+}
+
 func (t *Endpoint) AttachReturn(returnPath tun.Return) error {
 	t.returnAccess.Lock()
 	defer t.returnAccess.Unlock()