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")
40 nonceDiff = flag.Int("noncediff", 1, "Allow nonce difference")
41 timeoutP = flag.Int("timeout", 60, "Timeout seconds")
42 noisy = flag.Bool("noise", false, "Enable noise appending")
45 type PeerReadyEvent struct {
50 type PeerState struct {
55 terminate chan struct{}
58 func NewPeerState(peer *govpn.Peer, iface string) *PeerState {
59 tap, sink, ready, terminate, err := govpn.TAPListen(iface)
61 log.Println("Unable to create Eth", err)
74 type EthEvent struct {
82 timeout := time.Second * time.Duration(*timeoutP)
84 log.SetFlags(log.Ldate | log.Lmicroseconds | log.Lshortfile)
87 govpn.Timeout = *timeoutP
88 govpn.Noncediff = *nonceDiff
89 govpn.NoiseEnable = *noisy
90 govpn.PeersInit(*peersPath)
92 bind, err := net.ResolveUDPAddr("udp", *bindAddr)
96 conn, err := net.ListenUDP("udp", bind)
100 udpSink, udpBuf, udpReady := govpn.ConnListen(conn)
102 termSignal := make(chan os.Signal, 1)
103 signal.Notify(termSignal, os.Interrupt, os.Kill)
105 hsHeartbeat := time.Tick(timeout)
106 go func() { <-hsHeartbeat }()
109 var state *govpn.Handshake
110 var peerState *PeerState
113 states := make(map[string]*govpn.Handshake)
114 peers := make(map[string]*PeerState)
115 peerReadySink := make(chan PeerReadyEvent)
116 knownPeers := govpn.KnownPeers(make(map[string]**govpn.Peer))
117 var peerReady PeerReadyEvent
118 var udpPkt govpn.UDPPkt
119 var udpPktData []byte
120 var ethEvent EthEvent
121 var peerId *govpn.PeerId
122 var handshakeProcessForce bool
123 ethSink := make(chan EthEvent)
125 log.Println(govpn.VersionGet())
126 log.Println("Max MTU on TAP interface:", govpn.TAPMaxMTU())
128 log.Println("Stats are going to listen on", *stats)
129 statsPort, err := net.Listen("tcp", *stats)
133 go govpn.StatsProcessor(statsPort, &knownPeers)
135 log.Println("Server started")
144 for addr, hs := range states {
145 if hs.LastPing.Add(timeout).Before(now) {
146 log.Println("Deleting handshake state", addr)
151 for addr, state := range peers {
152 if state.peer.LastPing.Add(timeout).Before(now) {
153 log.Println("Deleting peer", state.peer)
155 delete(knownPeers, addr)
156 downPath := path.Join(
158 state.peer.Id.String(),
161 go govpn.ScriptCall(downPath, state.tap.Name)
162 state.terminate <- struct{}{}
166 case peerReady = <-peerReadySink:
167 for addr, state := range peers {
168 if state.tap.Name != peerReady.iface {
172 delete(knownPeers, addr)
173 state.terminate <- struct{}{}
177 addr = peerReady.peer.Addr.String()
178 state := NewPeerState(peerReady.peer, peerReady.iface)
183 knownPeers[addr] = &peerReady.peer
186 log.Println("Registered interface", peerReady.iface, "with peer", peer)
187 go func(state *PeerState) {
188 for data := range state.sink {
196 case ethEvent = <-ethSink:
197 if s, exists := peers[ethEvent.peer.Addr.String()]; !exists || s.peer != ethEvent.peer {
200 ethEvent.peer.EthProcess(ethEvent.data, conn, ethEvent.ready)
201 case udpPkt = <-udpSink:
202 if udpPkt.Addr == nil {
203 udpReady <- struct{}{}
206 udpPktData = udpBuf[:udpPkt.Size]
207 addr = udpPkt.Addr.String()
208 handshakeProcessForce = false
210 if _, exists = peers[addr]; handshakeProcessForce || !exists {
211 peerId = govpn.IDsCache.Find(udpPktData)
213 log.Println("Unknown identity from", addr)
214 udpReady <- struct{}{}
217 state, exists = states[addr]
219 state = govpn.HandshakeNew(udpPkt.Addr)
222 peer = state.Server(peerId, conn, udpPktData)
224 log.Println("Peer handshake finished", peer)
225 if _, exists = peers[addr]; exists {
227 peerReadySink <- PeerReadyEvent{peer, peers[addr].tap.Name}
231 upPath := path.Join(govpn.PeersPath, peer.Id.String(), "up.sh")
232 result, err := govpn.ScriptCall(upPath, "")
236 sepIndex := bytes.Index(result, []byte{'\n'})
238 sepIndex = len(result)
240 ifaceName := string(result[:sepIndex])
241 peerReadySink <- PeerReadyEvent{peer, ifaceName}
245 if !handshakeProcessForce {
246 udpReady <- struct{}{}
250 peerState, exists = peers[addr]
252 udpReady <- struct{}{}
255 // If it fails during processing, then try to work with it
256 // as with handshake packet
257 if !peerState.peer.UDPProcess(udpPktData, peerState.tap, udpReady) {
258 handshakeProcessForce = true
259 goto HandshakeProcess