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main.go
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/
main.go
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/*
GoVPN -- simple secure free software virtual private network daemon
Copyright (C) 2014-2015 Sergey Matveev <stargrave@stargrave.org>
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/>.
*/
// Simple secure free software virtual private network daemon.
package main
import (
"bytes"
"flag"
"log"
"net"
"os"
"os/signal"
"path"
"time"
"govpn"
)
var (
bindAddr = flag.String("bind", "[::]:1194", "Bind to address")
peersPath = flag.String("peers", "peers", "Path to peers keys directory")
mtu = flag.Int("mtu", 1500, "MTU")
nonceDiff = flag.Int("noncediff", 1, "Allow nonce difference")
timeoutP = flag.Int("timeout", 60, "Timeout seconds")
)
type PeerReadyEvent struct {
peer *govpn.Peer
iface string
}
type PeerState struct {
peer *govpn.Peer
tap *govpn.TAP
sink chan []byte
ready chan struct{}
terminate chan struct{}
}
func NewPeerState(peer *govpn.Peer, iface string) *PeerState {
tap, sink, ready, terminate, err := govpn.TAPListen(iface)
if err != nil {
log.Println("Unable to create Eth", err)
return nil
}
state := PeerState{
peer: peer,
tap: tap,
sink: sink,
ready: ready,
terminate: terminate,
}
return &state
}
type EthEvent struct {
peer *govpn.Peer
data []byte
ready chan struct{}
}
func main() {
flag.Parse()
timeout := time.Second * time.Duration(*timeoutP)
var err error
log.SetFlags(log.Ldate | log.Lmicroseconds | log.Lshortfile)
govpn.MTU = *mtu
govpn.Timeout = *timeoutP
govpn.Noncediff = *nonceDiff
govpn.PeersInit(*peersPath)
bind, err := net.ResolveUDPAddr("udp", *bindAddr)
if err != nil {
panic(err)
}
conn, err := net.ListenUDP("udp", bind)
if err != nil {
panic(err)
}
udpSink, udpBuf, udpReady := govpn.ConnListen(conn)
termSignal := make(chan os.Signal, 1)
signal.Notify(termSignal, os.Interrupt, os.Kill)
hsHeartbeat := time.Tick(timeout)
go func() { <-hsHeartbeat }()
var addr string
var state *govpn.Handshake
var peerState *PeerState
var peer *govpn.Peer
var exists bool
states := make(map[string]*govpn.Handshake)
peers := make(map[string]*PeerState)
peerReadySink := make(chan PeerReadyEvent)
var peerReady PeerReadyEvent
var udpPkt *govpn.UDPPkt
var udpPktData []byte
var ethEvent EthEvent
ethSink := make(chan EthEvent)
log.Println("Server version", govpn.Version)
log.Println("Server started")
MainCycle:
for {
select {
case <-termSignal:
break MainCycle
case <-hsHeartbeat:
now := time.Now()
for addr, hs := range states {
if hs.LastPing.Add(timeout).Before(now) {
log.Println("Deleting handshake state", addr)
delete(states, addr)
}
}
for addr, state := range peers {
if state.peer.LastPing.Add(timeout).Before(now) {
log.Println("Deleting peer", state.peer)
delete(peers, addr)
downPath := path.Join(
govpn.PeersPath,
state.peer.Id.String(),
"down.sh",
)
go govpn.ScriptCall(downPath, state.tap.Name)
state.terminate <- struct{}{}
}
}
case peerReady = <-peerReadySink:
for addr, state := range peers {
if state.tap.Name != peerReady.iface {
continue
}
delete(peers, addr)
state.terminate <- struct{}{}
break
}
addr = peerReady.peer.Addr.String()
state := NewPeerState(peerReady.peer, peerReady.iface)
if state == nil {
continue
}
peers[addr] = state
delete(states, addr)
log.Println("Registered interface", peerReady.iface, "with peer", peer)
go func(state *PeerState) {
for data := range state.sink {
ethSink <- EthEvent{
peer: state.peer,
data: data,
ready: state.ready,
}
}
}(state)
case ethEvent = <-ethSink:
if _, exists := peers[ethEvent.peer.Addr.String()]; !exists {
continue
}
ethEvent.peer.EthProcess(ethEvent.data, conn, ethEvent.ready)
case udpPkt = <-udpSink:
if udpPkt == nil {
udpReady <- struct{}{}
continue
}
udpPktData = udpBuf[:udpPkt.Size]
addr = udpPkt.Addr.String()
if govpn.IsValidHandshakePkt(udpPktData) {
state, exists = states[addr]
if !exists {
state = govpn.HandshakeNew(udpPkt.Addr)
states[addr] = state
}
peer = state.Server(conn, udpPktData)
if peer != nil {
log.Println("Peer handshake finished", peer)
if _, exists = peers[addr]; exists {
go func() {
peerReadySink <- PeerReadyEvent{peer, peers[addr].tap.Name}
}()
} else {
go func() {
upPath := path.Join(govpn.PeersPath, peer.Id.String(), "up.sh")
result, err := govpn.ScriptCall(upPath, "")
if err != nil {
return
}
sepIndex := bytes.Index(result, []byte{'\n'})
if sepIndex < 0 {
sepIndex = len(result)
}
ifaceName := string(result[:sepIndex])
peerReadySink <- PeerReadyEvent{peer, ifaceName}
}()
}
}
udpReady <- struct{}{}
continue
}
peerState, exists = peers[addr]
if !exists {
udpReady <- struct{}{}
continue
}
peerState.peer.UDPProcess(udpPktData, peerState.tap, udpReady)
}
}
}