Change: local resolve DNS in UDP request due to TURN failed

adapters/outbound/base.go

@@ -78,13 +78,8 @@ func NewConn(c net.Conn, a C.ProxyAdapter) C.Conn {
 	return &conn{c, []string{a.Name()}}
 }
 
-type PacketConn interface {
-	net.PacketConn
-	WriteWithMetadata(p []byte, metadata *C.Metadata) (n int, err error)
-}
-
 type packetConn struct {
-	PacketConn
+	net.PacketConn
 	chain C.Chain
 }
 
@@ -96,7 +91,7 @@ func (c *packetConn) AppendToChains(a C.ProxyAdapter) {
 	c.chain = append(c.chain, a.Name())
 }
 
-func newPacketConn(pc PacketConn, a C.ProxyAdapter) C.PacketConn {
+func newPacketConn(pc net.PacketConn, a C.ProxyAdapter) C.PacketConn {
 	return &packetConn{pc, []string{a.Name()}}
 }