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// 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/>.
// This helper is intended to be long-lived, and run with administrator privileges.
// It will launch a http server and expose a REST API to control OpenVPN and the firewall.
// At the moment, it is only used in Darwin and Windows - although it could also be used in GNU/Linux systems (but we use the one-shot bitmask-root wrapper in GNU/Linux instead).
// In Windows, this helper will run on the first available port after the standard one (7171).
// In other systems, the 7171 port is hardcoded.
package helper
import (
"encoding/json"
"log"
"net/http"
"os/exec"
)
var (
AppName = "DemoLibVPN"
BinaryName = "bitmask"
Version = "git"
)
type openvpnT struct {
cmd *exec.Cmd
}
// startHelper is the main entrypoint. It can react to cli args (used to install or manage the service in windows), and
// eventually will start the http server.
func StartHelper(port int) {
initializeService(port)
parseCliArgs()
daemonize()
runServer(port)
}
// serveHTTP will start the HTTP server that exposes the firewall and openvpn api.
// this can be called at different times by the different implementations of the helper.
func serveHTTP(bindAddr string) {
log.Println("Starting HTTP server at", bindAddr)
openvpn := openvpnT{nil}
http.HandleFunc("/openvpn/start", openvpn.start)
http.HandleFunc("/openvpn/stop", openvpn.stop)
http.HandleFunc("/firewall/start", firewallStartHandler)
http.HandleFunc("/firewall/stop", firewallStopHandler)
http.HandleFunc("/firewall/isup", firewallIsUpHandler)
http.HandleFunc("/version", versionHandler)
log.Fatal(http.ListenAndServe(bindAddr, nil))
}
func (openvpn *openvpnT) start(w http.ResponseWriter, r *http.Request) {
args, err := getArgs(r)
if err != nil {
log.Printf("An error has occurred processing flags: %v", err)
w.Write([]byte(err.Error()))
return
}
args = parseOpenvpnArgs(args)
log.Printf("start openvpn: %v", args)
err = openvpn.run(args)
if err != nil {
log.Printf("Error starting openvpn: %v", err)
w.Write([]byte(err.Error()))
}
}
func (openvpn *openvpnT) run(args []string) error {
if openvpn.cmd != nil {
log.Printf("openvpn was running, stop it first")
err := openvpn.kill()
if err != nil {
return err
}
}
log.Println("OPENVPN PATH:", getOpenvpnPath())
// TODO: if it dies we should restart it
openvpn.cmd = exec.Command(getOpenvpnPath(), args...)
return openvpn.cmd.Start()
}
func (openvpn *openvpnT) stop(w http.ResponseWriter, r *http.Request) {
log.Println("stop openvpn")
if openvpn.cmd == nil || openvpn.cmd.ProcessState != nil {
openvpn.cmd = nil
return
}
err := openvpn.kill()
if err != nil {
log.Printf("Error stoping openvpn: %v", err)
w.Write([]byte(err.Error()))
}
}
func (openvpn *openvpnT) kill() error {
err := kill(openvpn.cmd)
if err == nil {
openvpn.cmd.Wait()
} else {
log.Printf("Error killing the process: %v", err)
}
openvpn.cmd = nil
return nil
}
func firewallStartHandler(w http.ResponseWriter, r *http.Request) {
gateways, err := getArgs(r)
if err != nil {
log.Printf("An error has occurred processing gateways: %v", err)
w.Write([]byte(err.Error()))
return
}
err = firewallStart(gateways)
if err != nil {
log.Printf("Error starting firewall: %v", err)
w.Write([]byte(err.Error()))
return
}
log.Println("Start firewall: firewall started")
}
func firewallStopHandler(w http.ResponseWriter, r *http.Request) {
err := firewallStop()
if err != nil {
log.Printf("Error stoping firewall: %v", err)
w.Write([]byte(err.Error()))
}
log.Println("Stop firewall: firewall stopped")
}
func firewallIsUpHandler(w http.ResponseWriter, r *http.Request) {
if firewallIsUp() {
w.Write([]byte("true"))
w.WriteHeader(http.StatusOK)
} else {
w.Write([]byte("false"))
w.WriteHeader(http.StatusNoContent)
}
}
func versionHandler(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(AppName + "/" + Version + "\n"))
w.WriteHeader(http.StatusOK)
}
func getArgs(r *http.Request) ([]string, error) {
args := []string{}
decoder := json.NewDecoder(r.Body)
err := decoder.Decode(&args)
return args, err
}
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