add ssh tunnel

pkg/internal/util/ssh/conn.go

@@ -22,3 +22,27 @@ func NewClientConn(conn net.Conn, client *ssh.Client) net.Conn {
 func (c *ClientConn) Client() *ssh.Client {
 	return c.client
 }
+
+type sshConn struct {
+	channel ssh.Channel
+	net.Conn
+}
+
+func NewConn(conn net.Conn, channel ssh.Channel) net.Conn {
+	return &sshConn{
+		Conn:    conn,
+		channel: channel,
+	}
+}
+
+func (c *sshConn) Read(b []byte) (n int, err error) {
+	return c.channel.Read(b)
+}
+
+func (c *sshConn) Write(b []byte) (n int, err error) {
+	return c.channel.Write(b)
+}
+
+func (c *sshConn) Close() error {
+	return c.channel.Close()
+}