src/cypherpunks.ru/govpn/cmd/govpn-client/main.go

   1 /*
   2 GoVPN -- simple secure free software virtual private network daemon
   3 Copyright (C) 2014-2019 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, version 3 of the License.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16 */
  17
  18 // Simple secure, DPI/censorship-resistant free software VPN daemon client.
  19 package main
  20
  21 import (
  22         "flag"
  23         "fmt"
  24         "log"
  25         "os"
  26         "os/signal"
  27         "time"
  28
  29         "cypherpunks.ru/govpn"
  30         "cypherpunks.ru/govpn/client"
  31 )
  32
  33 func main() {
  34         var (
  35                 remoteAddr  = flag.String("remote", "", "Remote server address")
  36                 proto       = flag.String("proto", "udp", "Protocol to use: udp or tcp")
  37                 ifaceName   = flag.String("iface", "tap0", "TUN/TAP network interface")
  38                 verifierRaw = flag.String("verifier", "", "Verifier")
  39                 keyPath     = flag.String("key", "", "Path to passphrase file")
  40                 upPath      = flag.String("up", "", "Path to up-script")
  41                 downPath    = flag.String("down", "", "Path to down-script")
  42                 stats       = flag.String("stats", "", "Enable stats retrieving on host:port")
  43                 proxyAddr   = flag.String("proxy", "", "Use HTTP proxy on host:port")
  44                 proxyAuth   = flag.String("proxy-auth", "", "user:password Basic proxy auth")
  45                 mtu         = flag.Int("mtu", govpn.MTUDefault, "MTU of TUN/TAP interface")
  46                 timeoutP    = flag.Int("timeout", 60, "Timeout seconds")
  47                 timeSync    = flag.Int("timesync", 0, "Time synchronization requirement")
  48                 noreconnect = flag.Bool("noreconnect", false, "Disable reconnection after timeout")
  49                 noisy       = flag.Bool("noise", false, "Enable noise appending")
  50                 encless     = flag.Bool("encless", false, "Encryptionless mode")
  51                 cpr         = flag.Int("cpr", 0, "Enable constant KiB/sec out traffic rate")
  52                 egdPath     = flag.String("egd", "", "Optional path to EGD socket")
  53                 syslog      = flag.Bool("syslog", false, "Enable logging to syslog")
  54                 version     = flag.Bool("version", false, "Print version information")
  55                 warranty    = flag.Bool("warranty", false, "Print warranty information")
  56                 protocol    client.Protocol
  57                 err         error
  58         )
  59
  60         flag.Parse()
  61         if *warranty {
  62                 fmt.Println(govpn.Warranty)
  63                 return
  64         }
  65         if *version {
  66                 fmt.Println(govpn.VersionGet())
  67                 return
  68         }
  69         log.SetFlags(log.Ldate | log.Lmicroseconds | log.Lshortfile)
  70
  71         if *egdPath != "" {
  72                 log.Println("Using", *egdPath, "EGD")
  73                 govpn.EGDInit(*egdPath)
  74         }
  75
  76         switch *proto {
  77         case "udp":
  78                 protocol = client.ProtocolUDP
  79         case "tcp":
  80                 protocol = client.ProtocolTCP
  81         default:
  82                 log.Fatalln("Unknown protocol specified")
  83         }
  84
  85         if *proxyAddr != "" && protocol == client.ProtocolUDP {
  86                 log.Fatalln("HTTP proxy is supported only in TCP mode")
  87         }
  88
  89         if *verifierRaw == "" {
  90                 log.Fatalln("-verifier is required")
  91         }
  92         verifier, err := govpn.VerifierFromString(*verifierRaw)
  93         if err != nil {
  94                 log.Fatalln("Invalid -verifier:", err)
  95         }
  96         key, err := govpn.KeyRead(*keyPath)
  97         if err != nil {
  98                 log.Fatalln("Invalid -key:", err)
  99         }
 100         priv := verifier.PasswordApply(key)
 101         if *encless {
 102                 if protocol != client.ProtocolTCP {
 103                         log.Fatalln("Currently encryptionless mode works only with TCP")
 104                 }
 105                 *noisy = true
 106         }
 107         conf := client.Configuration{
 108                 PrivateKey: priv,
 109                 Peer: &govpn.PeerConf{
 110                         ID:       verifier.ID,
 111                         Iface:    *ifaceName,
 112                         MTU:      *mtu,
 113                         Timeout:  time.Second * time.Duration(*timeoutP),
 114                         TimeSync: *timeSync,
 115                         Noise:    *noisy,
 116                         CPR:      *cpr,
 117                         Encless:  *encless,
 118                         Verifier: verifier,
 119                         DSAPriv:  priv,
 120                 },
 121                 Protocol:            protocol,
 122                 InterfaceName:       *ifaceName,
 123                 ProxyAddress:        *proxyAddr,
 124                 ProxyAuthentication: *proxyAuth,
 125                 RemoteAddress:       *remoteAddr,
 126                 UpPath:              *upPath,
 127                 DownPath:            *downPath,
 128                 StatsAddress:        *stats,
 129                 NoReconnect:         *noreconnect,
 130                 MTU:                 *mtu,
 131         }
 132         if err = conf.Validate(); err != nil {
 133                 log.Fatalln("Invalid settings:", err)
 134         }
 135
 136         log.Println(govpn.VersionGet())
 137
 138         if *syslog {
 139                 govpn.SyslogEnable()
 140         }
 141
 142         termSignal := make(chan os.Signal, 1)
 143         signal.Notify(termSignal, os.Interrupt, os.Kill)
 144         c := client.NewClient(conf, verifier, termSignal)
 145         go c.MainCycle()
 146         if err = <-c.Error; err != nil {
 147                 log.Fatalln(err)
 148         }
 149 }