9 "github.com/bytom/p2p/upnp"
10 log "github.com/sirupsen/logrus"
11 cmn "github.com/tendermint/tmlibs/common"
12 tlog "github.com/tendermint/tmlibs/log"
15 type Listener interface {
16 Connections() <-chan net.Conn
17 InternalAddress() *NetAddress
18 ExternalAddress() *NetAddress
23 // Implements Listener
24 type DefaultListener struct {
30 connections chan net.Conn
34 numBufferedConnections = 10
35 defaultExternalPort = 8770
39 func splitHostPort(addr string) (host string, port int) {
40 host, portStr, err := net.SplitHostPort(addr)
44 port, err = strconv.Atoi(portStr)
51 // skipUPNP: If true, does not try getUPNPExternalAddress()
52 func NewDefaultListener(protocol string, lAddr string, skipUPNP bool, logger tlog.Logger) (Listener, bool, bool) {
53 // Local listen IP & port
54 lAddrIP, lAddrPort := splitHostPort(lAddr)
57 var listener net.Listener
62 for i := 0; i < tryListenSeconds; i++ {
63 listener, err = net.Listen(protocol, lAddr)
66 } else if i < tryListenSeconds-1 {
67 time.Sleep(time.Second * 1)
73 // Actual listener local IP & port
74 listenerIP, listenerPort := splitHostPort(listener.Addr().String())
75 log.WithFields(log.Fields{
78 }).Info("Local listener")
80 // Determine internal address...
81 var intAddr *NetAddress
82 intAddr, err = NewNetAddressString(lAddr)
87 // Determine external address...
88 var extAddr *NetAddress
90 // If the lAddrIP is INADDR_ANY, try UPnP
91 if lAddrIP == "" || lAddrIP == "0.0.0.0" {
92 extAddr = getUPNPExternalAddress(lAddrPort, listenerPort)
101 if address := GetIP([]string{}, time.Duration(0)); address.Success == true {
102 extAddr = NewNetAddressIPPort(net.ParseIP(address.Ip), uint16(lAddrPort))
105 log.Info("Error get external ip:", address.Error)
108 // Otherwise just use the local address...
110 extAddr = getNaiveExternalAddress(listenerPort)
113 cmn.PanicCrisis("Could not determine external address!")
116 dl := &DefaultListener{
120 connections: make(chan net.Conn, numBufferedConnections),
122 dl.BaseService = *cmn.NewBaseService(logger, "DefaultListener", dl)
123 dl.Start() // Started upon construction
124 return dl, mapResult, extIP
127 func (l *DefaultListener) OnStart() error {
128 l.BaseService.OnStart()
133 func (l *DefaultListener) OnStop() {
134 l.BaseService.OnStop()
138 // Accept connections and pass on the channel
139 func (l *DefaultListener) listenRoutine() {
141 conn, err := l.listener.Accept()
144 break // Go to cleanup
147 // listener wasn't stopped,
148 // yet we encountered an error.
153 l.connections <- conn
158 for _ = range l.connections {
163 // A channel of inbound connections.
164 // It gets closed when the listener closes.
165 func (l *DefaultListener) Connections() <-chan net.Conn {
169 func (l *DefaultListener) InternalAddress() *NetAddress {
173 func (l *DefaultListener) ExternalAddress() *NetAddress {
177 // NOTE: The returned listener is already Accept()'ing.
178 // So it's not suitable to pass into http.Serve().
179 func (l *DefaultListener) NetListener() net.Listener {
183 func (l *DefaultListener) String() string {
184 return fmt.Sprintf("Listener(@%v)", l.extAddr)
187 /* external address helpers */
189 // UPNP external address discovery & port mapping
190 func getUPNPExternalAddress(externalPort, internalPort int) *NetAddress {
191 log.Info("Getting UPNP external address")
192 nat, err := upnp.Discover()
194 log.WithField("error", err).Error("Could not perform UPNP discover")
198 ext, err := nat.GetExternalAddress()
200 log.WithField("error", err).Error("Could not perform UPNP external address")
204 // UPnP can't seem to get the external port, so let's just be explicit.
205 if externalPort == 0 {
206 externalPort = defaultExternalPort
209 externalPort, err = nat.AddPortMapping("tcp", externalPort, internalPort, "bytomd", 0)
211 log.WithField("error", err).Error("Could not add UPNP port mapping")
215 log.WithField("address", ext).Info("Got UPNP external address")
216 return NewNetAddressIPPort(ext, uint16(externalPort))
219 // TODO: use syscalls: http://pastebin.com/9exZG4rh
220 func getNaiveExternalAddress(port int) *NetAddress {
221 addrs, err := net.InterfaceAddrs()
223 cmn.PanicCrisis(cmn.Fmt("Could not fetch interface addresses: %v", err))
226 for _, a := range addrs {
227 ipnet, ok := a.(*net.IPNet)
232 if v4 == nil || v4[0] == 127 {
235 return NewNetAddressIPPort(ipnet.IP, uint16(port))