chore: dns outbound support tcp

common/net/deadline/conn.go

@@ -26,6 +26,11 @@ type Conn struct {
 	resultCh     chan *connReadResult
 }
 
+func IsConn(conn any) bool {
+	_, ok := conn.(*Conn)
+	return ok
+}
+
 func NewConn(conn net.Conn) *Conn {
 	c := &Conn{
 		ExtendedConn: bufio.NewExtendedConn(conn),

common/net/deadline/pipe_sing.go

@@ -215,3 +215,8 @@ func (p *pipe) waitReadBuffer() (buffer *buf.Buffer, err error) {
 		return nil, os.ErrDeadlineExceeded
 	}
 }
+
+func IsPipe(conn any) bool {
+	_, ok := conn.(*pipe)
+	return ok
+}

common/net/sing.go

@@ -23,6 +23,12 @@ type ExtendedReader = network.ExtendedReader
 var WriteBuffer = bufio.WriteBuffer
 
 func NewDeadlineConn(conn net.Conn) ExtendedConn {
+	if deadline.IsPipe(conn) || deadline.IsPipe(network.UnwrapReader(conn)) {
+		return NewExtendedConn(conn) // pipe always have correctly deadline implement
+	}
+	if deadline.IsConn(conn) || deadline.IsConn(network.UnwrapReader(conn)) {
+		return NewExtendedConn(conn) // was a *deadline.Conn
+	}
 	return deadline.NewConn(conn)
 }