func main() {
flag.Parse()
timeout := *timeoutP
var err error
log.SetFlags(log.Ldate | log.Lmicroseconds | log.Lshortfile)
govpn.MTU = *mtu
id, err := govpn.IDDecode(*IDRaw)
if err != nil {
log.Fatalln(err)
}
if *egdPath != "" {
log.Println("Using", *egdPath, "EGD")
govpn.EGDInit(*egdPath)
}
pub, priv := govpn.NewVerifier(id, govpn.StringFromFile(*keyPath))
conf := &govpn.PeerConf{
Id: id,
Timeout: time.Second * time.Duration(timeout),
NoiseEnable: *noisy,
CPR: *cpr,
DSAPub: pub,
DSAPriv: priv,
}
govpn.PeersInitDummy(id, conf)
var conn io.Writer
var sink chan []byte
var ready chan struct{}
switch *proto {
case "udp":
conn, sink, ready = startUDP()
case "tcp":
if *proxyAddr != "" {
conn, sink, ready = proxyTCP()
} else {
conn, sink, ready = startTCP()
}
default:
log.Fatalln("Unknown protocol specified")
}
tap, ethSink, ethReady, _, err := govpn.TAPListen(
*ifaceName,
time.Second*time.Duration(timeout),
*cpr,
)
if err != nil {
log.Fatalln("Can not listen on TAP interface:", err)
}
timeouts := 0
firstUpCall := true
var peer *govpn.Peer
var ethPkt []byte
var pkt []byte
knownPeers := govpn.KnownPeers(map[string]**govpn.Peer{*remoteAddr: &peer})
log.Println(govpn.VersionGet())
log.Println("Connected to", *proto, *remoteAddr)
log.Println("Max MTU on TAP interface:", govpn.TAPMaxMTU())
if *stats != "" {
log.Println("Stats are going to listen on", *stats)
statsPort, err := net.Listen("tcp", *stats)
if err != nil {
log.Fatalln("Can not listen on stats port:", err)
}
go govpn.StatsProcessor(statsPort, &knownPeers)
}
termSignal := make(chan os.Signal, 1)
signal.Notify(termSignal, os.Interrupt, os.Kill)
log.Println("Starting handshake")
handshake := govpn.HandshakeStart(*remoteAddr, conn, conf)
MainCycle:
for {
if peer != nil && (peer.BytesIn+peer.BytesOut) > govpn.MaxBytesPerKey {
peer.Zero()
peer = nil
handshake = govpn.HandshakeStart(*remoteAddr, conn, conf)
log.Println("Rehandshaking")
}
select {
case <-termSignal:
break MainCycle
case ethPkt = <-ethSink:
if peer == nil {
if len(ethPkt) > 0 {
ethReady <- struct{}{}
}
continue
}
peer.EthProcess(ethPkt, ethReady)
case pkt = <-sink:
timeouts++
if timeouts >= timeout {
break MainCycle
}
if pkt == nil {
ready <- struct{}{}
continue
}
if peer == nil {
if govpn.IDsCache.Find(pkt) == nil {
log.Println("Invalid identity in handshake packet")
ready <- struct{}{}
continue
}
if p := handshake.Client(pkt); p != nil {
log.Println("Handshake completed")
if firstUpCall {
go govpn.ScriptCall(*upPath, *ifaceName)
firstUpCall = false
}
peer = p
handshake.Zero()
handshake = nil
}
ready <- struct{}{}
continue
}
if peer == nil {
ready <- struct{}{}
continue
}
if peer.PktProcess(pkt, tap, ready) {
timeouts = 0
}
}
}
govpn.ScriptCall(*downPath, *ifaceName)
}
func main() {
flag.Parse()
timeout := time.Second * time.Duration(govpn.TimeoutDefault)
log.SetFlags(log.Ldate | log.Lmicroseconds | log.Lshortfile)
log.Println(govpn.VersionGet())
govpn.MTU = *mtu
govpn.PeersInit(*peersPath)
if *egdPath != "" {
log.Println("Using", *egdPath, "EGD")
govpn.EGDInit(*egdPath)
}
sink := make(chan Pkt)
switch *proto {
case "udp":
startUDP(sink)
case "tcp":
startTCP(sink)
case "all":
startUDP(sink)
startTCP(sink)
default:
log.Fatalln("Unknown protocol specified")
}
termSignal := make(chan os.Signal, 1)
signal.Notify(termSignal, os.Interrupt, os.Kill)
hsHeartbeat := time.Tick(timeout)
go func() { <-hsHeartbeat }()
var state *govpn.Handshake
var peerState *PeerState
var peer *govpn.Peer
var exists bool
states := make(map[string]*govpn.Handshake)
peers := make(map[string]*PeerState)
peerReadySink := make(chan PeerReadyEvent)
knownPeers := govpn.KnownPeers(make(map[string]**govpn.Peer))
var peerReady PeerReadyEvent
var pkt Pkt
var ethEvent EthEvent
var peerId *govpn.PeerId
var peerConf *govpn.PeerConf
var handshakeProcessForce bool
ethSink := make(chan EthEvent)
log.Println("Max MTU on TAP interface:", govpn.TAPMaxMTU())
if *stats != "" {
log.Println("Stats are going to listen on", *stats)
statsPort, err := net.Listen("tcp", *stats)
if err != nil {
log.Fatalln("Can not listen on stats port:", err)
}
go govpn.StatsProcessor(statsPort, &knownPeers)
}
if *proxy != "" {
go proxyStart(sink)
}
log.Println("Server started")
MainCycle:
for {
select {
case <-termSignal:
break MainCycle
case <-hsHeartbeat:
now := time.Now()
for addr, hs := range states {
if hs.LastPing.Add(timeout).Before(now) {
log.Println("Deleting handshake state", addr)
hs.Zero()
delete(states, addr)
}
}
for addr, state := range peers {
if state.peer.LastPing.Add(timeout).Before(now) {
log.Println("Deleting peer", state.peer)
delete(peers, addr)
delete(knownPeers, addr)
downPath := path.Join(
govpn.PeersPath,
state.peer.Id.String(),
"down.sh",
)
go govpn.ScriptCall(downPath, state.tap.Name)
state.terminate <- struct{}{}
state.peer.Zero()
}
}
case peerReady = <-peerReadySink:
for addr, state := range peers {
if state.tap.Name != peerReady.iface {
continue
}
delete(peers, addr)
delete(knownPeers, addr)
state.terminate <- struct{}{}
state.peer.Zero()
break
}
state := NewPeerState(peerReady.peer, peerReady.iface)
if state == nil {
continue
}
peers[peerReady.peer.Addr] = state
knownPeers[peerReady.peer.Addr] = &peerReady.peer
states[peerReady.peer.Addr].Zero()
delete(states, peerReady.peer.Addr)
log.Println("Registered interface", peerReady.iface, "with peer", peer)
go func(state *PeerState) {
for data := range state.sink {
ethSink <- EthEvent{
peer: state.peer,
data: data,
ready: state.ready,
}
}
}(state)
case ethEvent = <-ethSink:
if s, exists := peers[ethEvent.peer.Addr]; !exists || s.peer != ethEvent.peer {
continue
}
ethEvent.peer.EthProcess(ethEvent.data, ethEvent.ready)
case pkt = <-sink:
if pkt.data == nil {
pkt.ready <- struct{}{}
continue
}
handshakeProcessForce = false
HandshakeProcess:
if _, exists = peers[pkt.addr]; handshakeProcessForce || !exists {
peerId = govpn.IDsCache.Find(pkt.data)
if peerId == nil {
log.Println("Unknown identity from", pkt.addr)
pkt.ready <- struct{}{}
continue
}
peerConf = peerId.Conf()
if peerConf == nil {
log.Println("Can not get peer configuration", peerId.String())
pkt.ready <- struct{}{}
continue
}
state, exists = states[pkt.addr]
if !exists {
state = govpn.HandshakeNew(pkt.addr, pkt.conn, peerConf)
states[pkt.addr] = state
}
peer = state.Server(pkt.data)
if peer != nil {
log.Println("Peer handshake finished", peer)
if _, exists = peers[pkt.addr]; exists {
go func() {
peerReadySink <- PeerReadyEvent{
peer, peers[pkt.addr].tap.Name,
}
}()
} else {
go func() {
upPath := path.Join(govpn.PeersPath, peer.Id.String(), "up.sh")
result, err := govpn.ScriptCall(upPath, "")
if err != nil {
return
}
sepIndex := bytes.Index(result, []byte{'\n'})
if sepIndex < 0 {
sepIndex = len(result)
}
ifaceName := string(result[:sepIndex])
peerReadySink <- PeerReadyEvent{peer, ifaceName}
}()
}
}
if !handshakeProcessForce {
pkt.ready <- struct{}{}
}
continue
}
peerState, exists = peers[pkt.addr]
if !exists {
pkt.ready <- struct{}{}
continue
}
// If it fails during processing, then try to work with it
// as with handshake packet
if !peerState.peer.PktProcess(pkt.data, peerState.tap, pkt.ready) {
handshakeProcessForce = true
goto HandshakeProcess
}
}
}
}
func main() {
flag.Parse()
timeout := time.Second * time.Duration(govpn.TimeoutDefault)
log.SetFlags(log.Ldate | log.Lmicroseconds | log.Lshortfile)
log.Println(govpn.VersionGet())
govpn.MTU = *mtu
confInit()
knownPeers = govpn.KnownPeers(make(map[string]**govpn.Peer))
if *egdPath != "" {
log.Println("Using", *egdPath, "EGD")
govpn.EGDInit(*egdPath)
}
switch *proto {
case "udp":
startUDP()
case "tcp":
startTCP()
case "all":
startUDP()
startTCP()
default:
log.Fatalln("Unknown protocol specified")
}
termSignal := make(chan os.Signal, 1)
signal.Notify(termSignal, os.Interrupt, os.Kill)
hsHeartbeat := time.Tick(timeout)
go func() { <-hsHeartbeat }()
log.Println("Max MTU on TAP interface:", govpn.TAPMaxMTU())
if *stats != "" {
log.Println("Stats are going to listen on", *stats)
statsPort, err := net.Listen("tcp", *stats)
if err != nil {
log.Fatalln("Can not listen on stats port:", err)
}
go govpn.StatsProcessor(statsPort, &knownPeers)
}
if *proxy != "" {
go proxyStart()
}
log.Println("Server started")
var needsDeletion bool
MainCycle:
for {
select {
case <-termSignal:
break MainCycle
case <-hsHeartbeat:
now := time.Now()
hsLock.Lock()
for addr, hs := range handshakes {
if hs.LastPing.Add(timeout).Before(now) {
log.Println("Deleting handshake state", addr)
hs.Zero()
delete(handshakes, addr)
}
}
peersLock.Lock()
peersByIdLock.Lock()
kpLock.Lock()
for addr, ps := range peers {
ps.peer.BusyR.Lock()
needsDeletion = ps.peer.LastPing.Add(timeout).Before(now)
ps.peer.BusyR.Unlock()
if needsDeletion {
log.Println("Deleting peer", ps.peer)
delete(peers, addr)
delete(knownPeers, addr)
delete(peersById, *ps.peer.Id)
go govpn.ScriptCall(
confs[*ps.peer.Id].Down,
ps.tap.Name,
)
ps.terminator <- struct{}{}
}
}
hsLock.Unlock()
peersLock.Unlock()
peersByIdLock.Unlock()
kpLock.Unlock()
}
}
}
func handleTCP(conn *net.TCPConn, timeouted, rehandshaking, termination chan struct{}) {
hs := govpn.HandshakeStart(*remoteAddr, conn, conf)
buf := make([]byte, govpn.MTU)
var n int
var err error
var prev int
var peer *govpn.Peer
var terminator chan struct{}
HandshakeCycle:
for {
select {
case <-termination:
break HandshakeCycle
default:
}
if prev == govpn.MTU {
log.Println("Timeouted waiting for the packet")
timeouted <- struct{}{}
break HandshakeCycle
}
conn.SetReadDeadline(time.Now().Add(time.Duration(timeout) * time.Second))
n, err = conn.Read(buf[prev:])
if err != nil {
log.Println("Connection timeouted")
timeouted <- struct{}{}
break HandshakeCycle
}
prev += n
peerId := idsCache.Find(buf[:prev])
if peerId == nil {
continue
}
peer = hs.Client(buf[:prev])
prev = 0
if peer == nil {
continue
}
log.Println("Handshake completed")
knownPeers = govpn.KnownPeers(map[string]**govpn.Peer{*remoteAddr: &peer})
if firstUpCall {
go govpn.ScriptCall(*upPath, *ifaceName)
firstUpCall = false
}
hs.Zero()
terminator = make(chan struct{})
go func() {
heartbeat := time.NewTicker(peer.Timeout)
var data []byte
Processor:
for {
select {
case <-heartbeat.C:
peer.EthProcess(nil)
case <-terminator:
break Processor
case data = <-tap.Sink:
peer.EthProcess(data)
}
}
heartbeat.Stop()
peer.Zero()
}()
break HandshakeCycle
}
if hs != nil {
hs.Zero()
}
if peer == nil {
return
}
nonceExpectation := make([]byte, govpn.NonceSize)
peer.NonceExpectation(nonceExpectation)
prev = 0
var i int
TransportCycle:
for {
select {
case <-termination:
break TransportCycle
default:
}
if prev == govpn.MTU {
log.Println("Timeouted waiting for the packet")
timeouted <- struct{}{}
break TransportCycle
}
conn.SetReadDeadline(time.Now().Add(time.Duration(timeout) * time.Second))
n, err = conn.Read(buf[prev:])
if err != nil {
log.Println("Connection timeouted")
timeouted <- struct{}{}
break TransportCycle
}
prev += n
CheckMore:
if prev < govpn.MinPktLength {
continue
}
i = bytes.Index(buf[:prev], nonceExpectation)
if i == -1 {
continue
}
if !peer.PktProcess(buf[:i+govpn.NonceSize], tap, false) {
log.Println("Unauthenticated packet, dropping connection")
timeouted <- struct{}{}
break TransportCycle
}
if atomic.LoadInt64(&peer.BytesIn)+atomic.LoadInt64(&peer.BytesOut) > govpn.MaxBytesPerKey {
log.Println("Need rehandshake")
rehandshaking <- struct{}{}
break TransportCycle
}
peer.NonceExpectation(nonceExpectation)
copy(buf, buf[i+govpn.NonceSize:prev])
prev = prev - i - govpn.NonceSize
goto CheckMore
}
if terminator != nil {
terminator <- struct{}{}
}
peer.Zero()
conn.Close()
}
func startUDP(timeouted, rehandshaking, termination chan struct{}) {
remote, err := net.ResolveUDPAddr("udp", *remoteAddr)
if err != nil {
log.Fatalln("Can not resolve remote address:", err)
}
conn, err := net.DialUDP("udp", nil, remote)
if err != nil {
log.Fatalln("Can not listen on UDP:", err)
}
log.Println("Connected to UDP:" + *remoteAddr)
hs := govpn.HandshakeStart(*remoteAddr, conn, conf)
buf := make([]byte, govpn.MTU)
var n int
var timeouts int
var peer *govpn.Peer
var terminator chan struct{}
MainCycle:
for {
select {
case <-termination:
break MainCycle
default:
}
conn.SetReadDeadline(time.Now().Add(time.Second))
n, err = conn.Read(buf)
if timeouts == timeout {
log.Println("Timeouted")
timeouted <- struct{}{}
break
}
if err != nil {
timeouts++
continue
}
if peer != nil {
if peer.PktProcess(buf[:n], tap, true) {
timeouts = 0
} else {
log.Println("Unauthenticated packet")
timeouts++
}
if atomic.LoadInt64(&peer.BytesIn)+atomic.LoadInt64(&peer.BytesOut) > govpn.MaxBytesPerKey {
log.Println("Need rehandshake")
rehandshaking <- struct{}{}
break MainCycle
}
continue
}
if idsCache.Find(buf[:n]) == nil {
log.Println("Invalid identity in handshake packet")
continue
}
timeouts = 0
peer = hs.Client(buf[:n])
if peer == nil {
continue
}
log.Println("Handshake completed")
knownPeers = govpn.KnownPeers(map[string]**govpn.Peer{*remoteAddr: &peer})
if firstUpCall {
go govpn.ScriptCall(*upPath, *ifaceName)
firstUpCall = false
}
hs.Zero()
terminator = make(chan struct{})
go func() {
heartbeat := time.NewTicker(peer.Timeout)
var data []byte
Processor:
for {
select {
case <-heartbeat.C:
peer.EthProcess(nil)
case <-terminator:
break Processor
case data = <-tap.Sink:
peer.EthProcess(data)
}
}
heartbeat.Stop()
peer.Zero()
}()
}
if terminator != nil {
terminator <- struct{}{}
}
if hs != nil {
hs.Zero()
}
conn.Close()
}