port

var DialCall = func(context context.T, network string, host string, portNumber string, addressList []string) (string, net.Conn, error) {
	if host == "" {
		destinationAddress := net.JoinHostPort("localhost", portNumber)
		conn, err := net.Dial(network, destinationAddress)
		return destinationAddress, conn, err
	}
	context.Log().Debugf("Using remote host: %s", host)
	var firstErr error // The error from the first address is most relevant.
	for _, addr := range addressList {
		destinationAddress := net.JoinHostPort(addr, portNumber)
		conn, err := net.Dial(network, destinationAddress)
		if err == nil {
			return destinationAddress, conn, err
		}
		if firstErr == nil {
			firstErr = err
		}
	}
	if firstErr == nil {
		firstErr = errors.New("missing address")
	}
	return "", nil, firstErr
}

var GetSession = func(context context.T, portParameters PortParameters, addresses []string, cancelled chan struct{}, clientVersion string, sessionId string) (session IPortSession, err error) {

	if portParameters.Type == mgsConfig.LocalPortForwarding &&
		versionutil.Compare(clientVersion, muxSupportedClientVersion, true) >= 0 {

		if session, err = NewMuxPortSession(context, clientVersion, cancelled, portParameters.Host, portParameters.PortNumber, addresses, sessionId); err == nil {
			return session, nil
		}
	} else {
		if session, err = NewBasicPortSession(context, cancelled, portParameters.Host, portParameters.PortNumber, addresses, portParameters.Type); err == nil {
			return session, nil
		}
	}
	return nil, err
}