psiphon-tunnel-core/psiphon/sshClientVersionPicker.go

/*
 * Copyright (c) 2017, Psiphon Inc.
 * All rights reserved.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

package psiphon

import (
	"sync/atomic"
)

var registeredSSHClientVersionPicker atomic.Value

func RegisterSSHClientVersionPicker(picker func() string) {
	registeredSSHClientVersionPicker.Store(picker)
}

func pickSSHClientVersion() string {
	picker := registeredSSHClientVersionPicker.Load()
	if picker != nil {
		return picker.(func() string)()
	}
	return ""
}