src/cypherpunks.ru/govpn/cmd/govpn-server/main.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 // Simple secure, DPI/censorship-resistant free software VPN daemon.
  20 package main
  21
  22 import (
  23         "flag"
  24         "fmt"
  25         "log"
  26         "net"
  27         "os"
  28         "os/signal"
  29         "time"
  30
  31         "cypherpunks.ru/govpn"
  32 )
  33
  34 var (
  35         bindAddr = flag.String("bind", "[::]:1194", "Bind to address")
  36         proto    = flag.String("proto", "udp", "Protocol to use: udp, tcp or all")
  37         confPath = flag.String("conf", "peers.yaml", "Path to configuration YAML")
  38         stats    = flag.String("stats", "", "Enable stats retrieving on host:port")
  39         proxy    = flag.String("proxy", "", "Enable HTTP proxy on host:port")
  40         egdPath  = flag.String("egd", "", "Optional path to EGD socket")
  41         warranty = flag.Bool("warranty", false, "Print warranty information")
  42 )
  43
  44 func main() {
  45         flag.Parse()
  46         if *warranty {
  47                 fmt.Println(govpn.Warranty)
  48                 return
  49         }
  50         timeout := time.Second * time.Duration(govpn.TimeoutDefault)
  51         log.SetFlags(log.Ldate | log.Lmicroseconds | log.Lshortfile)
  52         log.Println(govpn.VersionGet())
  53
  54         confInit()
  55         knownPeers = govpn.KnownPeers(make(map[string]**govpn.Peer))
  56
  57         if *egdPath != "" {
  58                 log.Println("Using", *egdPath, "EGD")
  59                 govpn.EGDInit(*egdPath)
  60         }
  61
  62         switch *proto {
  63         case "udp":
  64                 startUDP()
  65         case "tcp":
  66                 startTCP()
  67         case "all":
  68                 startUDP()
  69                 startTCP()
  70         default:
  71                 log.Fatalln("Unknown protocol specified")
  72         }
  73
  74         termSignal := make(chan os.Signal, 1)
  75         signal.Notify(termSignal, os.Interrupt, os.Kill)
  76
  77         hsHeartbeat := time.Tick(timeout)
  78         go func() { <-hsHeartbeat }()
  79
  80         if *stats != "" {
  81                 log.Println("Stats are going to listen on", *stats)
  82                 statsPort, err := net.Listen("tcp", *stats)
  83                 if err != nil {
  84                         log.Fatalln("Can not listen on stats port:", err)
  85                 }
  86                 go govpn.StatsProcessor(statsPort, &knownPeers)
  87         }
  88         if *proxy != "" {
  89                 go proxyStart()
  90         }
  91         log.Println("Server started")
  92
  93         var needsDeletion bool
  94 MainCycle:
  95         for {
  96                 select {
  97                 case <-termSignal:
  98                         log.Println("Terminating")
  99                         for _, ps := range peers {
 100                                 govpn.ScriptCall(
 101                                         confs[*ps.peer.Id].Down,
 102                                         ps.tap.Name,
 103                                         ps.peer.Addr,
 104                                 )
 105                         }
 106                         break MainCycle
 107                 case <-hsHeartbeat:
 108                         now := time.Now()
 109                         hsLock.Lock()
 110                         for addr, hs := range handshakes {
 111                                 if hs.LastPing.Add(timeout).Before(now) {
 112                                         log.Println("Deleting handshake state", addr)
 113                                         hs.Zero()
 114                                         delete(handshakes, addr)
 115                                 }
 116                         }
 117                         peersLock.Lock()
 118                         peersByIdLock.Lock()
 119                         kpLock.Lock()
 120                         for addr, ps := range peers {
 121                                 ps.peer.BusyR.Lock()
 122                                 needsDeletion = ps.peer.LastPing.Add(timeout).Before(now)
 123                                 ps.peer.BusyR.Unlock()
 124                                 if needsDeletion {
 125                                         log.Println("Deleting peer", ps.peer)
 126                                         delete(peers, addr)
 127                                         delete(knownPeers, addr)
 128                                         delete(peersById, *ps.peer.Id)
 129                                         go govpn.ScriptCall(
 130                                                 confs[*ps.peer.Id].Down,
 131                                                 ps.tap.Name,
 132                                                 ps.peer.Addr,
 133                                         )
 134                                         ps.terminator <- struct{}{}
 135                                 }
 136                         }
 137                         hsLock.Unlock()
 138                         peersLock.Unlock()
 139                         peersByIdLock.Unlock()
 140                         kpLock.Unlock()
 141                 }
 142         }
 143 }