Add string method to tunnel

tunnel/default.go

@@ -606,3 +606,7 @@ func (t *tun) Listen(addr string) (Listener, error) {
 	// return the listener
 	return tl, nil
 }
+
+func (t *tun) String() string {
+	return "mucp"
+}

tunnel/tunnel.go

@@ -19,6 +19,8 @@ type Tunnel interface {
 	Dial(addr string) (Conn, error)
 	// Accept connections
 	Listen(addr string) (Listener, error)
+	// Name of the tunnel implementation
+	String() string
 }
 
 // The listener provides similar constructs to the transport.Listener