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// +build !linux
// Copyright (C) 2018-2020 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 (
"bytes"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"log"
"net/http"
"strconv"
"strings"
"time"
"0xacab.org/leap/bitmask-vpn/pkg/config"
"0xacab.org/leap/bitmask-vpn/pkg/vpn/bonafide"
)
type launcher struct {
helperAddr string
failed bool
}
const initialHelperPort = 7171
func probeHelperPort(port int) int {
// this should be enough for a local reply
timeout := time.Duration(500 * time.Millisecond)
c := http.Client{Timeout: timeout}
for {
if smellsLikeOurHelperSpirit(port, &c) {
return port
}
port++
/* we could go until 65k, but there's really no need */
if port > 10000 {
break
}
}
log.Println("WARN: Cannot find any working helper")
return 0
}
func smellsLikeOurHelperSpirit(port int, c *http.Client) bool {
uri := "http://localhost:" + strconv.Itoa(port) + "/version"
resp, err := c.Get(uri)
if err != nil {
return false
}
if resp.StatusCode == 200 {
ver, err := ioutil.ReadAll(resp.Body)
defer resp.Body.Close()
if err != nil {
return false
}
if strings.Contains(string(ver), config.ApplicationName) {
log.Println("DEBUG: Successfully probed for matching helper at", uri)
return true
} else {
log.Println("DEBUG: Another helper seems to be running:", string(ver))
log.Println("DEBUG: But we were hoping to find:", config.ApplicationName)
}
}
return false
}
func newLauncher() (*launcher, error) {
helperPort := probeHelperPort(initialHelperPort)
helperAddr := "http://localhost:" + strconv.Itoa(helperPort)
return &launcher{helperAddr, false}, nil
}
func (l *launcher) close() error {
return nil
}
func (l *launcher) check() (helpers bool, priviledge bool, err error) {
return true, true, nil
}
func (l *launcher) openvpnStart(flags ...string) error {
byteFlags, err := json.Marshal(flags)
if err != nil {
return err
}
return l.send("/openvpn/start", byteFlags)
}
func (l *launcher) openvpnStop() error {
return l.send("/openvpn/stop", nil)
}
func (l *launcher) firewallStart(gateways []bonafide.Gateway) error {
ipList := make([]string, len(gateways))
for i, gw := range gateways {
ipList[i] = gw.IPAddress
}
byteIPs, err := json.Marshal(ipList)
if err != nil {
return err
}
return l.send("/firewall/start", byteIPs)
}
func (l *launcher) firewallStop() error {
return l.send("/firewall/stop", nil)
}
func (l *launcher) firewallIsUp() bool {
var isup bool = false
res, err := http.Post(l.helperAddr+"/firewall/isup", "", nil)
if err != nil {
return false
}
defer res.Body.Close()
if res.StatusCode != http.StatusOK {
fmt.Printf("Got an error status code for firewall/isup: %v\n", res.StatusCode)
isup = false
} else {
upStr, err := ioutil.ReadAll(res.Body)
if err != nil {
fmt.Errorf("Error getting body for firewall/isup: %q", err)
return false
}
isup, err = strconv.ParseBool(string(upStr))
if err != nil {
fmt.Errorf("Error parsing body for firewall/isup: %q", err)
return false
}
}
return isup
}
func (l *launcher) send(path string, body []byte) error {
var reader io.Reader
if body != nil {
reader = bytes.NewReader(body)
}
res, err := http.Post(l.helperAddr+path, "", reader)
if err != nil {
return err
}
defer res.Body.Close()
resErr, err := ioutil.ReadAll(res.Body)
if len(resErr) > 0 {
/* FIXME why do we trigger a fatal with this error? */
return fmt.Errorf("FATAL: Helper returned an error: %q", resErr)
}
return err
}
|
