9 "github.com/bytom/p2p/upnp"
10 log "github.com/sirupsen/logrus"
11 cmn "github.com/tendermint/tmlibs/common"
14 type Listener interface {
15 Connections() <-chan net.Conn
16 InternalAddress() *NetAddress
17 ExternalAddress() *NetAddress
22 // Implements Listener
23 type DefaultListener struct {
29 connections chan net.Conn
33 numBufferedConnections = 10
34 defaultExternalPort = 8770
38 func splitHostPort(addr string) (host string, port int) {
39 host, portStr, err := net.SplitHostPort(addr)
43 port, err = strconv.Atoi(portStr)
50 // skipUPNP: If true, does not try getUPNPExternalAddress()
51 func NewDefaultListener(protocol string, lAddr string, skipUPNP bool) (Listener, bool) {
52 // Local listen IP & port
53 lAddrIP, lAddrPort := splitHostPort(lAddr)
56 var listener net.Listener
59 var listenerStatus = false
61 for i := 0; i < tryListenSeconds; i++ {
62 listener, err = net.Listen(protocol, lAddr)
65 } else if i < tryListenSeconds-1 {
66 time.Sleep(time.Second * 1)
72 // Actual listener local IP & port
73 listenerIP, listenerPort := splitHostPort(listener.Addr().String())
74 log.Info("Local listener", " ip:", listenerIP, " port:", listenerPort)
76 // Determine internal address...
77 var intAddr *NetAddress
78 intAddr, err = NewNetAddressString(lAddr)
83 // Determine external address...
84 var extAddr *NetAddress
86 // If the lAddrIP is INADDR_ANY, try UPnP
87 if lAddrIP == "" || lAddrIP == "0.0.0.0" {
88 extAddr = getUPNPExternalAddress(lAddrPort, listenerPort)
96 if address := GetIP(); address.Success == true {
97 extAddr = NewNetAddressIPPort(net.ParseIP(address.Ip), uint16(lAddrPort))
101 // Otherwise just use the local address...
103 extAddr = getNaiveExternalAddress(listenerPort, false)
106 cmn.PanicCrisis("Could not determine external address!")
109 dl := &DefaultListener{
113 connections: make(chan net.Conn, numBufferedConnections),
115 dl.BaseService = *cmn.NewBaseService(nil, "DefaultListener", dl)
116 dl.Start() // Started upon construction
118 if !listenerStatus && getExtIP {
119 conn, err := net.DialTimeout("tcp", extAddr.String(), 3*time.Second)
121 if err != nil && conn == nil {
122 log.Error("Could not open listen port")
125 if err == nil && conn != nil {
126 log.Info("Success open listen port")
127 listenerStatus = true
132 return dl, listenerStatus
135 func (l *DefaultListener) OnStart() error {
136 l.BaseService.OnStart()
141 func (l *DefaultListener) OnStop() {
142 l.BaseService.OnStop()
146 // Accept connections and pass on the channel
147 func (l *DefaultListener) listenRoutine() {
149 conn, err := l.listener.Accept()
152 break // Go to cleanup
155 // listener wasn't stopped,
156 // yet we encountered an error.
161 l.connections <- conn
166 for _ = range l.connections {
171 // A channel of inbound connections.
172 // It gets closed when the listener closes.
173 func (l *DefaultListener) Connections() <-chan net.Conn {
177 func (l *DefaultListener) InternalAddress() *NetAddress {
181 func (l *DefaultListener) ExternalAddress() *NetAddress {
185 // NOTE: The returned listener is already Accept()'ing.
186 // So it's not suitable to pass into http.Serve().
187 func (l *DefaultListener) NetListener() net.Listener {
191 func (l *DefaultListener) String() string {
192 return fmt.Sprintf("Listener(@%v)", l.extAddr)
195 /* external address helpers */
197 // UPNP external address discovery & port mapping
198 func getUPNPExternalAddress(externalPort, internalPort int) *NetAddress {
199 log.Info("Getting UPNP external address")
200 nat, err := upnp.Discover()
202 log.Info("Could not perform UPNP discover. error:", err)
206 ext, err := nat.GetExternalAddress()
208 log.Info("Could not perform UPNP external address. error:", err)
212 // UPnP can't seem to get the external port, so let's just be explicit.
213 if externalPort == 0 {
214 externalPort = defaultExternalPort
217 externalPort, err = nat.AddPortMapping("tcp", externalPort, internalPort, "bytomd", 0)
219 log.Info("Could not add UPNP port mapping. error:", err)
223 log.Info("Got UPNP external address ", ext)
224 return NewNetAddressIPPort(ext, uint16(externalPort))
227 func getNaiveExternalAddress(port int, settleForLocal bool) *NetAddress {
228 addrs, err := net.InterfaceAddrs()
230 cmn.PanicCrisis(cmn.Fmt("Could not fetch interface addresses: %v", err))
233 for _, a := range addrs {
234 ipnet, ok := a.(*net.IPNet)
239 if v4 == nil || (!settleForLocal && v4[0] == 127) {
242 return NewNetAddressIPPort(ipnet.IP, uint16(port))
245 // try again, but settle for local
246 log.Info("Node may not be connected to internet. Settling for local address")
247 return getNaiveExternalAddress(port, true)