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// +build linux
// Copyright (C) 2018 LEAP
//
// 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 bitmask
import (
"errors"
"log"
"os"
"os/exec"
)
const (
systemOpenvpnPath = "/usr/sbin/openvpn"
snapOpenvpnPath = "/snap/bin/riseup-vpn.openvpn"
)
var bitmaskRootPaths = []string{
"/usr/sbin/bitmask-root",
"/usr/local/sbin/bitmask-root",
"/snap/bin/riseup-vpn.bitmask-root",
}
type launcher struct {
openvpnCh chan []string
}
func newLauncher() (*launcher, error) {
l := launcher{make(chan []string, 1)}
go l.openvpnRunner()
return &l, nil
}
func (l *launcher) close() error {
return nil
}
func (l *launcher) openvpnStart(flags ...string) error {
log.Println("openvpn start: ", flags)
arg := []string{"openvpn", "start", getOpenvpnPath()}
arg = append(arg, flags...)
l.openvpnCh <- arg
return nil
}
func (l *launcher) openvpnStop() error {
l.openvpnCh <- nil
log.Println("openvpn stop")
return runBitmaskRoot("openvpn", "stop")
}
func (l *launcher) firewallStart(gateways []gateway) error {
log.Println("firewall start")
arg := []string{"firewall", "start"}
for _, gw := range gateways {
arg = append(arg, gw.IPAddress)
}
return runBitmaskRoot(arg...)
}
func (l *launcher) firewallStop() error {
log.Println("firewall stop")
return runBitmaskRoot("firewall", "stop")
}
func (l *launcher) openvpnRunner(arg ...string) {
running := false
runOpenvpn := func(arg []string) {
for running {
err := runBitmaskRoot(arg...)
if err != nil {
log.Printf("An error ocurred running openvpn: %v", err)
}
}
}
for arg := range l.openvpnCh {
if arg == nil {
running = false
} else {
running = true
go runOpenvpn(arg)
}
}
}
func runBitmaskRoot(arg ...string) error {
bitmaskRoot, err := bitmaskRootPath()
if err != nil {
return err
}
arg = append([]string{bitmaskRoot}, arg...)
cmd := exec.Command("pkexec", arg...)
err = cmd.Run()
if err != nil {
return err
}
return nil
}
func bitmaskRootPath() (string, error) {
for _, path := range bitmaskRootPaths {
if _, err := os.Stat(path); !os.IsNotExist(err) {
return path, nil
}
}
return "", errors.New("No bitmask-root found")
}
func getOpenvpnPath() string {
if os.Getenv("SNAP") != "" {
return snapOpenvpnPath
}
return systemOpenvpnPath
}
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