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 mtu = flag.Int("mtu", 1452, "MTU for outgoing packets")
42 egdPath = flag.String("egd", "", "Optional path to EGD socket")
52 type PeerReadyEvent struct {
57 type PeerState struct {
62 terminate chan struct{}
65 func NewPeerState(peer *govpn.Peer, iface string) *PeerState {
66 tap, sink, ready, terminate, err := govpn.TAPListen(iface, peer.Timeout, peer.CPR)
68 log.Println("Unable to create Eth", err)
81 type EthEvent struct {
89 timeout := time.Second * time.Duration(govpn.TimeoutDefault)
90 log.SetFlags(log.Ldate | log.Lmicroseconds | log.Lshortfile)
91 log.Println(govpn.VersionGet())
94 govpn.PeersInit(*peersPath)
97 log.Println("Using", *egdPath, "EGD")
98 govpn.EGDInit(*egdPath)
101 sink := make(chan Pkt)
111 log.Fatalln("Unknown protocol specified")
114 termSignal := make(chan os.Signal, 1)
115 signal.Notify(termSignal, os.Interrupt, os.Kill)
117 hsHeartbeat := time.Tick(timeout)
118 go func() { <-hsHeartbeat }()
120 var state *govpn.Handshake
121 var peerState *PeerState
124 states := make(map[string]*govpn.Handshake)
125 peers := make(map[string]*PeerState)
126 peerReadySink := make(chan PeerReadyEvent)
127 knownPeers := govpn.KnownPeers(make(map[string]**govpn.Peer))
128 var peerReady PeerReadyEvent
130 var ethEvent EthEvent
131 var peerId *govpn.PeerId
132 var peerConf *govpn.PeerConf
133 var handshakeProcessForce bool
134 ethSink := make(chan EthEvent)
136 log.Println("Max MTU on TAP interface:", govpn.TAPMaxMTU())
138 log.Println("Stats are going to listen on", *stats)
139 statsPort, err := net.Listen("tcp", *stats)
141 log.Fatalln("Can not listen on stats port:", err)
143 go govpn.StatsProcessor(statsPort, &knownPeers)
145 log.Println("Server started")
154 for addr, hs := range states {
155 if hs.LastPing.Add(timeout).Before(now) {
156 log.Println("Deleting handshake state", addr)
161 for addr, state := range peers {
162 if state.peer.LastPing.Add(timeout).Before(now) {
163 log.Println("Deleting peer", state.peer)
165 delete(knownPeers, addr)
166 downPath := path.Join(
168 state.peer.Id.String(),
171 go govpn.ScriptCall(downPath, state.tap.Name)
172 state.terminate <- struct{}{}
176 case peerReady = <-peerReadySink:
177 for addr, state := range peers {
178 if state.tap.Name != peerReady.iface {
182 delete(knownPeers, addr)
183 state.terminate <- struct{}{}
187 state := NewPeerState(peerReady.peer, peerReady.iface)
191 peers[peerReady.peer.Addr] = state
192 knownPeers[peerReady.peer.Addr] = &peerReady.peer
193 states[peerReady.peer.Addr].Zero()
194 delete(states, peerReady.peer.Addr)
195 log.Println("Registered interface", peerReady.iface, "with peer", peer)
196 go func(state *PeerState) {
197 for data := range state.sink {
205 case ethEvent = <-ethSink:
206 if s, exists := peers[ethEvent.peer.Addr]; !exists || s.peer != ethEvent.peer {
209 ethEvent.peer.EthProcess(ethEvent.data, ethEvent.ready)
212 pkt.ready <- struct{}{}
215 handshakeProcessForce = false
217 if _, exists = peers[pkt.addr]; handshakeProcessForce || !exists {
218 peerId = govpn.IDsCache.Find(pkt.data)
220 log.Println("Unknown identity from", pkt.addr)
221 pkt.ready <- struct{}{}
224 peerConf = peerId.Conf()
226 log.Println("Can not get peer configuration", peerId.String())
227 pkt.ready <- struct{}{}
230 state, exists = states[pkt.addr]
232 state = govpn.HandshakeNew(pkt.addr, pkt.conn, peerConf)
233 states[pkt.addr] = state
235 peer = state.Server(pkt.data)
237 log.Println("Peer handshake finished", peer)
238 if _, exists = peers[pkt.addr]; exists {
240 peerReadySink <- PeerReadyEvent{
241 peer, peers[pkt.addr].tap.Name,
246 upPath := path.Join(govpn.PeersPath, peer.Id.String(), "up.sh")
247 result, err := govpn.ScriptCall(upPath, "")
251 sepIndex := bytes.Index(result, []byte{'\n'})
253 sepIndex = len(result)
255 ifaceName := string(result[:sepIndex])
256 peerReadySink <- PeerReadyEvent{peer, ifaceName}
260 if !handshakeProcessForce {
261 pkt.ready <- struct{}{}
265 peerState, exists = peers[pkt.addr]
267 pkt.ready <- struct{}{}
270 // If it fails during processing, then try to work with it
271 // as with handshake packet
272 if !peerState.peer.PktProcess(pkt.data, peerState.tap, pkt.ready) {
273 handshakeProcessForce = true
274 goto HandshakeProcess