2 GoVPN -- simple secure free software virtual private network daemon
3 Copyright (C) 2014-2015 Sergey Matveev <stargrave@stargrave.org>
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.
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.
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/>.
19 // Simple secure free software virtual private network daemon.
37 bindAddr = flag.String("bind", "[::]:1194", "Bind to address")
38 proto = flag.String("proto", "udp", "Protocol to use: udp, tcp or all")
39 peersPath = flag.String("peers", "peers", "Path to peers keys directory")
40 stats = flag.String("stats", "", "Enable stats retrieving on host:port")
41 proxy = flag.String("proxy", "", "Enable HTTP proxy on host:port")
42 mtu = flag.Int("mtu", 1452, "MTU for outgoing packets")
43 egdPath = flag.String("egd", "", "Optional path to EGD socket")
53 type PeerReadyEvent struct {
58 type PeerState struct {
63 terminate chan struct{}
66 func NewPeerState(peer *govpn.Peer, iface string) *PeerState {
67 tap, sink, ready, terminate, err := govpn.TAPListen(iface, peer.Timeout, peer.CPR)
69 log.Println("Unable to create Eth", err)
82 type EthEvent struct {
90 timeout := time.Second * time.Duration(govpn.TimeoutDefault)
91 log.SetFlags(log.Ldate | log.Lmicroseconds | log.Lshortfile)
92 log.Println(govpn.VersionGet())
95 govpn.PeersInit(*peersPath)
98 log.Println("Using", *egdPath, "EGD")
99 govpn.EGDInit(*egdPath)
102 sink := make(chan Pkt)
112 log.Fatalln("Unknown protocol specified")
115 termSignal := make(chan os.Signal, 1)
116 signal.Notify(termSignal, os.Interrupt, os.Kill)
118 hsHeartbeat := time.Tick(timeout)
119 go func() { <-hsHeartbeat }()
121 var state *govpn.Handshake
122 var peerState *PeerState
125 states := make(map[string]*govpn.Handshake)
126 peers := make(map[string]*PeerState)
127 peerReadySink := make(chan PeerReadyEvent)
128 knownPeers := govpn.KnownPeers(make(map[string]**govpn.Peer))
129 var peerReady PeerReadyEvent
131 var ethEvent EthEvent
132 var peerId *govpn.PeerId
133 var peerConf *govpn.PeerConf
134 var handshakeProcessForce bool
135 ethSink := make(chan EthEvent)
137 log.Println("Max MTU on TAP interface:", govpn.TAPMaxMTU())
139 log.Println("Stats are going to listen on", *stats)
140 statsPort, err := net.Listen("tcp", *stats)
142 log.Fatalln("Can not listen on stats port:", err)
144 go govpn.StatsProcessor(statsPort, &knownPeers)
149 log.Println("Server started")
158 for addr, hs := range states {
159 if hs.LastPing.Add(timeout).Before(now) {
160 log.Println("Deleting handshake state", addr)
165 for addr, state := range peers {
166 if state.peer.LastPing.Add(timeout).Before(now) {
167 log.Println("Deleting peer", state.peer)
169 delete(knownPeers, addr)
170 downPath := path.Join(
172 state.peer.Id.String(),
175 go govpn.ScriptCall(downPath, state.tap.Name)
176 state.terminate <- struct{}{}
180 case peerReady = <-peerReadySink:
181 for addr, state := range peers {
182 if state.tap.Name != peerReady.iface {
186 delete(knownPeers, addr)
187 state.terminate <- struct{}{}
191 state := NewPeerState(peerReady.peer, peerReady.iface)
195 peers[peerReady.peer.Addr] = state
196 knownPeers[peerReady.peer.Addr] = &peerReady.peer
197 states[peerReady.peer.Addr].Zero()
198 delete(states, peerReady.peer.Addr)
199 log.Println("Registered interface", peerReady.iface, "with peer", peer)
200 go func(state *PeerState) {
201 for data := range state.sink {
209 case ethEvent = <-ethSink:
210 if s, exists := peers[ethEvent.peer.Addr]; !exists || s.peer != ethEvent.peer {
213 ethEvent.peer.EthProcess(ethEvent.data, ethEvent.ready)
216 pkt.ready <- struct{}{}
219 handshakeProcessForce = false
221 if _, exists = peers[pkt.addr]; handshakeProcessForce || !exists {
222 peerId = govpn.IDsCache.Find(pkt.data)
224 log.Println("Unknown identity from", pkt.addr)
225 pkt.ready <- struct{}{}
228 peerConf = peerId.Conf()
230 log.Println("Can not get peer configuration", peerId.String())
231 pkt.ready <- struct{}{}
234 state, exists = states[pkt.addr]
236 state = govpn.HandshakeNew(pkt.addr, pkt.conn, peerConf)
237 states[pkt.addr] = state
239 peer = state.Server(pkt.data)
241 log.Println("Peer handshake finished", peer)
242 if _, exists = peers[pkt.addr]; exists {
244 peerReadySink <- PeerReadyEvent{
245 peer, peers[pkt.addr].tap.Name,
250 upPath := path.Join(govpn.PeersPath, peer.Id.String(), "up.sh")
251 result, err := govpn.ScriptCall(upPath, "")
255 sepIndex := bytes.Index(result, []byte{'\n'})
257 sepIndex = len(result)
259 ifaceName := string(result[:sepIndex])
260 peerReadySink <- PeerReadyEvent{peer, ifaceName}
264 if !handshakeProcessForce {
265 pkt.ready <- struct{}{}
269 peerState, exists = peers[pkt.addr]
271 pkt.ready <- struct{}{}
274 // If it fails during processing, then try to work with it
275 // as with handshake packet
276 if !peerState.peer.PktProcess(pkt.data, peerState.tap, pkt.ready) {
277 handshakeProcessForce = true
278 goto HandshakeProcess