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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/>.
package bitmask
import (
"io/ioutil"
"log"
"path/filepath"
"strings"
"github.com/pebbe/zmq4"
)
const (
eventsEndpoint = "tcp://127.0.0.1:9001"
statusEvent = "VPN_STATUS_CHANGED"
)
func initEvents() (*zmq4.Socket, error) {
socket, err := zmq4.NewSocket(zmq4.SUB)
if err != nil {
return nil, err
}
if zmq4.HasCurve() {
err = initCurve(socket)
if err != nil {
return nil, err
}
}
err = socket.Connect(eventsEndpoint)
if err != nil {
return nil, err
}
err = socket.SetSubscribe(statusEvent)
return socket, err
}
func initCurve(socket *zmq4.Socket) error {
serverKeyData, err := ioutil.ReadFile(getServerKeyPath())
if err != nil {
return err
}
pubkey, seckey, err := zmq4.NewCurveKeypair()
if err != nil {
return err
}
serverkey := strings.Split(string(serverKeyData), "\"")[1]
return socket.ClientAuthCurve(serverkey, pubkey, seckey)
}
func (b *Bitmask) eventsHandler() {
for {
msg, err := b.eventsoc.RecvMessage(0)
if err != nil {
break
}
if msg[0][:len(statusEvent)] != statusEvent {
continue
}
status, err := b.GetStatus()
if err != nil {
log.Printf("Error receiving status: %v", err)
continue
}
b.statusCh <- status
}
}
func getServerKeyPath() string {
return filepath.Join(ConfigPath, "events", "zmq_certificates", "public_keys", "server.key")
}
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