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// +build windows
// Copyright (C) 2018-2021 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 vpn
import (
"bufio"
"bytes"
"encoding/binary"
"errors"
"fmt"
"log"
"os"
"strings"
"time"
"unicode/utf16"
"0xacab.org/leap/bitmask-vpn/pkg/vpn/bonafide"
"github.com/natefinch/npipe"
)
const pipeName = `\\.\pipe\openvpn\service`
type launcher struct {
mngPass string
}
func newLauncher() (*launcher, error) {
l := launcher{}
return &l, nil
}
func (l *launcher) close() error {
return nil
}
func (l *launcher) check() (helpers bool, privilege bool, err error) {
// TODO check if the named pipe exists
log.Println("bogus check on windows")
return true, true, nil
}
func (l *launcher) openvpnStart(flags ...string) error {
var b bytes.Buffer
/* DELETE-ME
var filtered []string
for _, v := range flags {
if v != "--tun-ipv6" {
filtered = append(filtered, v)
}
}
*/
cwd, _ := os.Getwd()
opts := `--client --dev tun --block-outside-dns --redirect-gateway --script-security 0 ` + strings.Join(flags, " ")
log.Println("openvpn start: ", opts)
timeout := 3 * time.Second
conn, err := npipe.DialTimeout(pipeName, timeout)
if err != nil {
fmt.Println("ERROR opening pipe")
return errors.New("cannot open openvpn pipe")
}
defer conn.Close()
writeUTF16Bytes(&b, cwd)
writeUTF16Bytes(&b, opts)
writeUTF16Bytes(&b, `\n`)
encoded := b.Bytes()
rw := bufio.NewReadWriter(bufio.NewReader(conn), bufio.NewWriter(conn))
_, err = rw.Write(encoded)
if err != nil {
log.Println("ERROR writing to pipe")
return errors.New("cannot write to openvpn pipe")
}
rw.Flush()
pid, err := getCommandResponse(rw)
if err != nil {
log.Println("ERROR getting pid")
}
log.Println("OpenVPN PID:", pid)
return nil
}
func (l *launcher) openvpnStop() error {
return nil
}
// TODO we will have to bring our helper back to do firewall
func (l *launcher) firewallStart(gateways []bonafide.Gateway) error {
log.Println("start: no firewall in windows")
return nil
}
func (l *launcher) firewallStop() error {
log.Println("stop: no firewall in windows")
return nil
}
func (l *launcher) firewallIsUp() bool {
log.Println("up: no firewall in windows")
return false
}
func writeUTF16Bytes(b *bytes.Buffer, in string) {
var u16 []uint16 = utf16.Encode([]rune(in + "\x00"))
binary.Write(b, binary.LittleEndian, u16)
}
func decodeUTF16String(s string) int {
var code int
var dec []byte
for _, v := range []byte(s) {
if byte(v) != byte(0) {
dec = append(dec, v)
}
}
_, err := fmt.Sscanf(string(dec), "%v", &code)
if err != nil {
fmt.Println("ERROR decoding")
}
return code
}
func getCommandResponse(rw *bufio.ReadWriter) (int, error) {
msg, err := rw.ReadString('\n')
if err != nil {
fmt.Println("ERROR reading")
}
ok := decodeUTF16String(msg)
if ok != 0 {
return -1, errors.New("command failed")
}
msg, err = rw.ReadString('\n')
if err != nil {
fmt.Println("ERROR reading")
}
pid := decodeUTF16String(msg)
if pid == 0 {
return -1, errors.New("command failed")
}
return pid, nil
}
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