src/cypherpunks.ru/govpn/cmd/govpn-server/common.go

   1 /*
   2 GoVPN -- simple secure free software virtual private network daemon
   3 Copyright (C) 2014-2016 Sergey Matveev <stargrave@stargrave.org>
   4
   5 This program is free software: you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation, either version 3 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19 package main
  20
  21 import (
  22         "bytes"
  23         "log"
  24         "sync"
  25         "time"
  26
  27         "cypherpunks.ru/govpn"
  28 )
  29
  30 type PeerState struct {
  31         peer       *govpn.Peer
  32         terminator chan struct{}
  33         tap        *govpn.TAP
  34 }
  35
  36 var (
  37         handshakes map[string]*govpn.Handshake = make(map[string]*govpn.Handshake)
  38         hsLock     sync.RWMutex
  39
  40         peers     map[string]*PeerState = make(map[string]*PeerState)
  41         peersLock sync.RWMutex
  42
  43         peersById     map[govpn.PeerId]string = make(map[govpn.PeerId]string)
  44         peersByIdLock sync.RWMutex
  45
  46         knownPeers govpn.KnownPeers
  47         kpLock     sync.RWMutex
  48 )
  49
  50 func peerReady(ps PeerState) {
  51         var data []byte
  52         heartbeat := time.NewTicker(ps.peer.Timeout)
  53 Processor:
  54         for {
  55                 select {
  56                 case <-heartbeat.C:
  57                         ps.peer.EthProcess(nil)
  58                 case <-ps.terminator:
  59                         break Processor
  60                 case data = <-ps.tap.Sink:
  61                         ps.peer.EthProcess(data)
  62                 }
  63         }
  64         close(ps.terminator)
  65         ps.peer.Zero()
  66         heartbeat.Stop()
  67 }
  68
  69 func callUp(peerId *govpn.PeerId) (string, error) {
  70         ifaceName := confs[*peerId].Iface
  71         if confs[*peerId].Up != "" {
  72                 result, err := govpn.ScriptCall(confs[*peerId].Up, "")
  73                 if err != nil {
  74                         log.Println("Script", confs[*peerId].Up, "call failed", err)
  75                         return "", err
  76                 }
  77                 if ifaceName == "" {
  78                         sepIndex := bytes.Index(result, []byte{'\n'})
  79                         if sepIndex < 0 {
  80                                 sepIndex = len(result)
  81                         }
  82                         ifaceName = string(result[:sepIndex])
  83                 }
  84         }
  85         if ifaceName == "" {
  86                 log.Println("Can not obtain interface name for", *peerId)
  87         }
  88         return ifaceName, nil
  89 }