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.
36 bindAddr = flag.String("bind", "[::]:1194", "Bind to address")
37 peersPath = flag.String("peers", "peers", "Path to peers keys directory")
38 stats = flag.String("stats", "", "Enable stats retrieving on host:port")
39 mtu = flag.Int("mtu", 1452, "MTU for outgoing packets")
42 type PeerReadyEvent struct {
47 type PeerState struct {
52 terminate chan struct{}
55 func NewPeerState(peer *govpn.Peer, iface string) *PeerState {
56 tap, sink, ready, terminate, err := govpn.TAPListen(iface, peer.Timeout, peer.CPR)
58 log.Println("Unable to create Eth", err)
71 type EthEvent struct {
79 timeout := time.Second * time.Duration(govpn.TimeoutDefault)
81 log.SetFlags(log.Ldate | log.Lmicroseconds | log.Lshortfile)
84 govpn.PeersInit(*peersPath)
86 bind, err := net.ResolveUDPAddr("udp", *bindAddr)
88 log.Fatalln("Can not resolve bind address:", err)
90 conn, err := net.ListenUDP("udp", bind)
92 log.Fatalln("Can listen on UDP:", err)
94 udpSink, udpBuf, udpReady := govpn.ConnListen(conn)
96 termSignal := make(chan os.Signal, 1)
97 signal.Notify(termSignal, os.Interrupt, os.Kill)
99 hsHeartbeat := time.Tick(timeout)
100 go func() { <-hsHeartbeat }()
103 var state *govpn.Handshake
104 var peerState *PeerState
107 states := make(map[string]*govpn.Handshake)
108 peers := make(map[string]*PeerState)
109 peerReadySink := make(chan PeerReadyEvent)
110 knownPeers := govpn.KnownPeers(make(map[string]**govpn.Peer))
111 var peerReady PeerReadyEvent
112 var udpPkt govpn.UDPPkt
113 var udpPktData []byte
114 var ethEvent EthEvent
115 var peerId *govpn.PeerId
116 var peerConf *govpn.PeerConf
117 var handshakeProcessForce bool
118 ethSink := make(chan EthEvent)
120 log.Println(govpn.VersionGet())
121 log.Println("Max MTU on TAP interface:", govpn.TAPMaxMTU())
123 log.Println("Stats are going to listen on", *stats)
124 statsPort, err := net.Listen("tcp", *stats)
126 log.Fatalln("Can not listen on stats port:", err)
128 go govpn.StatsProcessor(statsPort, &knownPeers)
130 log.Println("Server started")
139 for addr, hs := range states {
140 if hs.LastPing.Add(timeout).Before(now) {
141 log.Println("Deleting handshake state", addr)
146 for addr, state := range peers {
147 if state.peer.LastPing.Add(timeout).Before(now) {
148 log.Println("Deleting peer", state.peer)
150 delete(knownPeers, addr)
151 downPath := path.Join(
153 state.peer.Id.String(),
156 go govpn.ScriptCall(downPath, state.tap.Name)
157 state.terminate <- struct{}{}
161 case peerReady = <-peerReadySink:
162 for addr, state := range peers {
163 if state.tap.Name != peerReady.iface {
167 delete(knownPeers, addr)
168 state.terminate <- struct{}{}
172 addr = peerReady.peer.Addr.String()
173 state := NewPeerState(peerReady.peer, peerReady.iface)
178 knownPeers[addr] = &peerReady.peer
181 log.Println("Registered interface", peerReady.iface, "with peer", peer)
182 go func(state *PeerState) {
183 for data := range state.sink {
191 case ethEvent = <-ethSink:
192 if s, exists := peers[ethEvent.peer.Addr.String()]; !exists || s.peer != ethEvent.peer {
195 ethEvent.peer.EthProcess(ethEvent.data, conn, ethEvent.ready)
196 case udpPkt = <-udpSink:
197 if udpPkt.Addr == nil {
198 udpReady <- struct{}{}
201 udpPktData = udpBuf[:udpPkt.Size]
202 addr = udpPkt.Addr.String()
203 handshakeProcessForce = false
205 if _, exists = peers[addr]; handshakeProcessForce || !exists {
206 peerId = govpn.IDsCache.Find(udpPktData)
208 log.Println("Unknown identity from", addr)
209 udpReady <- struct{}{}
212 peerConf = peerId.Conf()
214 log.Println("Can not get peer configuration", peerId.String())
215 udpReady <- struct{}{}
218 state, exists = states[addr]
220 state = govpn.HandshakeNew(udpPkt.Addr, peerConf)
223 peer = state.Server(conn, udpPktData)
225 log.Println("Peer handshake finished", peer)
226 if _, exists = peers[addr]; exists {
228 peerReadySink <- PeerReadyEvent{peer, peers[addr].tap.Name}
232 upPath := path.Join(govpn.PeersPath, peer.Id.String(), "up.sh")
233 result, err := govpn.ScriptCall(upPath, "")
237 sepIndex := bytes.Index(result, []byte{'\n'})
239 sepIndex = len(result)
241 ifaceName := string(result[:sepIndex])
242 peerReadySink <- PeerReadyEvent{peer, ifaceName}
246 if !handshakeProcessForce {
247 udpReady <- struct{}{}
251 peerState, exists = peers[addr]
253 udpReady <- struct{}{}
256 // If it fails during processing, then try to work with it
257 // as with handshake packet
258 if !peerState.peer.UDPProcess(udpPktData, peerState.tap, udpReady) {
259 handshakeProcessForce = true
260 goto HandshakeProcess