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 mtu = flag.Int("mtu", 1500, "MTU")
39 nonceDiff = flag.Int("noncediff", 1, "Allow nonce difference")
40 timeoutP = flag.Int("timeout", 60, "Timeout seconds")
43 type PeerReadyEvent struct {
48 type PeerState struct {
53 terminate chan struct{}
56 func NewPeerState(peer *govpn.Peer, iface string) *PeerState {
57 tap, sink, ready, terminate, err := govpn.TAPListen(iface)
59 log.Println("Unable to create Eth", err)
72 type EthEvent struct {
80 timeout := time.Second * time.Duration(*timeoutP)
82 log.SetFlags(log.Ldate | log.Lmicroseconds | log.Lshortfile)
85 govpn.Timeout = *timeoutP
86 govpn.Noncediff = *nonceDiff
87 govpn.PeersInit(*peersPath)
89 bind, err := net.ResolveUDPAddr("udp", *bindAddr)
93 conn, err := net.ListenUDP("udp", bind)
97 udpSink, udpBuf, udpReady := govpn.ConnListen(conn)
99 termSignal := make(chan os.Signal, 1)
100 signal.Notify(termSignal, os.Interrupt, os.Kill)
102 hsHeartbeat := time.Tick(timeout)
103 go func() { <-hsHeartbeat }()
106 var state *govpn.Handshake
107 var peerState *PeerState
110 states := make(map[string]*govpn.Handshake)
111 peers := make(map[string]*PeerState)
112 peerReadySink := make(chan PeerReadyEvent)
113 var peerReady PeerReadyEvent
114 var udpPkt *govpn.UDPPkt
115 var udpPktData []byte
116 var ethEvent EthEvent
117 var peerId *govpn.PeerId
118 var handshakeProcessForce bool
119 ethSink := make(chan EthEvent)
121 log.Println(govpn.VersionGet())
122 log.Println("Server started")
131 for addr, hs := range states {
132 if hs.LastPing.Add(timeout).Before(now) {
133 log.Println("Deleting handshake state", addr)
138 for addr, state := range peers {
139 if state.peer.LastPing.Add(timeout).Before(now) {
140 log.Println("Deleting peer", state.peer)
142 downPath := path.Join(
144 state.peer.Id.String(),
147 go govpn.ScriptCall(downPath, state.tap.Name)
148 state.terminate <- struct{}{}
152 case peerReady = <-peerReadySink:
153 for addr, state := range peers {
154 if state.tap.Name != peerReady.iface {
158 state.terminate <- struct{}{}
162 addr = peerReady.peer.Addr.String()
163 state := NewPeerState(peerReady.peer, peerReady.iface)
170 log.Println("Registered interface", peerReady.iface, "with peer", peer)
171 go func(state *PeerState) {
172 for data := range state.sink {
180 case ethEvent = <-ethSink:
181 if s, exists := peers[ethEvent.peer.Addr.String()]; !exists || s.peer != ethEvent.peer {
184 ethEvent.peer.EthProcess(ethEvent.data, conn, ethEvent.ready)
185 case udpPkt = <-udpSink:
187 udpReady <- struct{}{}
190 udpPktData = udpBuf[:udpPkt.Size]
191 addr = udpPkt.Addr.String()
192 handshakeProcessForce = false
194 if _, exists = peers[addr]; handshakeProcessForce || !exists {
195 peerId = govpn.IDsCache.Find(udpPktData)
197 log.Println("Unknown identity from", addr)
198 udpReady <- struct{}{}
201 state, exists = states[addr]
203 state = govpn.HandshakeNew(udpPkt.Addr)
206 peer = state.Server(peerId, conn, udpPktData)
208 log.Println("Peer handshake finished", peer)
209 if _, exists = peers[addr]; exists {
211 peerReadySink <- PeerReadyEvent{peer, peers[addr].tap.Name}
215 upPath := path.Join(govpn.PeersPath, peer.Id.String(), "up.sh")
216 result, err := govpn.ScriptCall(upPath, "")
220 sepIndex := bytes.Index(result, []byte{'\n'})
222 sepIndex = len(result)
224 ifaceName := string(result[:sepIndex])
225 peerReadySink <- PeerReadyEvent{peer, ifaceName}
229 if !handshakeProcessForce {
230 udpReady <- struct{}{}
234 peerState, exists = peers[addr]
236 udpReady <- struct{}{}
239 // If it fails during processing, then try to work with it
240 // as with handshake packet
241 if !peerState.peer.UDPProcess(udpPktData, peerState.tap, udpReady) {
242 handshakeProcessForce = true
243 goto HandshakeProcess