--- /dev/null
+package p2p
+
+import (
+ "fmt"
+ "net"
+ "strconv"
+ "strings"
+ "time"
+
+ log "github.com/sirupsen/logrus"
+ cmn "github.com/tendermint/tmlibs/common"
+
+ cfg "github.com/vapor/config"
+ "github.com/vapor/errors"
+ "github.com/vapor/p2p/upnp"
+)
+
+const (
+ numBufferedConnections = 10
+ defaultExternalPort = 8770
+ tryListenTimes = 5
+)
+
+//Listener subset of the methods of DefaultListener
+type Listener interface {
+ Connections() <-chan net.Conn
+ InternalAddress() *NetAddress
+ ExternalAddress() *NetAddress
+ String() string
+ Stop() bool
+}
+
+// Defaults to tcp
+func protocolAndAddress(listenAddr string) (string, string) {
+ p, address := "tcp", listenAddr
+ parts := strings.SplitN(address, "://", 2)
+ if len(parts) == 2 {
+ p, address = parts[0], parts[1]
+ }
+ return p, address
+}
+
+// GetListener get listener and listen address.
+func GetListener(config *cfg.P2PConfig) (Listener, string) {
+ p, address := protocolAndAddress(config.ListenAddress)
+ l, listenerStatus := NewDefaultListener(p, address, config.SkipUPNP)
+
+ // We assume that the rpcListener has the same ExternalAddress.
+ // This is probably true because both P2P and RPC listeners use UPnP,
+ // except of course if the rpc is only bound to localhost
+ if listenerStatus {
+ return l, cmn.Fmt("%v:%v", l.ExternalAddress().IP.String(), l.ExternalAddress().Port)
+ }
+
+ return l, cmn.Fmt("%v:%v", l.InternalAddress().IP.String(), l.InternalAddress().Port)
+}
+
+//getUPNPExternalAddress UPNP external address discovery & port mapping
+func getUPNPExternalAddress(externalPort, internalPort int) (*NetAddress, error) {
+ nat, err := upnp.Discover()
+ if err != nil {
+ return nil, errors.Wrap(err, "could not perform UPNP discover")
+ }
+
+ ext, err := nat.GetExternalAddress()
+ if err != nil {
+ return nil, errors.Wrap(err, "could not perform UPNP external address")
+ }
+
+ if externalPort == 0 {
+ externalPort = defaultExternalPort
+ }
+ externalPort, err = nat.AddPortMapping("tcp", externalPort, internalPort, "bytomd tcp", 0)
+ if err != nil {
+ return nil, errors.Wrap(err, "could not add tcp UPNP port mapping")
+ }
+ externalPort, err = nat.AddPortMapping("udp", externalPort, internalPort, "bytomd udp", 0)
+ if err != nil {
+ return nil, errors.Wrap(err, "could not add udp UPNP port mapping")
+ }
+ return NewNetAddressIPPort(ext, uint16(externalPort)), nil
+}
+
+func splitHostPort(addr string) (host string, port int) {
+ host, portStr, err := net.SplitHostPort(addr)
+ if err != nil {
+ cmn.PanicSanity(err)
+ }
+ port, err = strconv.Atoi(portStr)
+ if err != nil {
+ cmn.PanicSanity(err)
+ }
+ return host, port
+}
+
+//DefaultListener Implements bytomd server Listener
+type DefaultListener struct {
+ cmn.BaseService
+
+ listener net.Listener
+ intAddr *NetAddress
+ extAddr *NetAddress
+ connections chan net.Conn
+}
+
+//NewDefaultListener create a default listener
+func NewDefaultListener(protocol string, lAddr string, skipUPNP bool) (Listener, bool) {
+ // Local listen IP & port
+ lAddrIP, lAddrPort := splitHostPort(lAddr)
+
+ listener, err := net.Listen(protocol, lAddr)
+ for i := 0; i < tryListenTimes && err != nil; i++ {
+ time.Sleep(time.Second * 1)
+ listener, err = net.Listen(protocol, lAddr)
+ }
+ if err != nil {
+ log.Panic(err)
+ }
+
+ intAddr, err := NewNetAddressString(lAddr)
+ if err != nil {
+ log.Panic(err)
+ }
+
+ // Actual listener local IP & port
+ listenerIP, listenerPort := splitHostPort(listener.Addr().String())
+ log.Info("Local listener", " ip:", listenerIP, " port:", listenerPort)
+
+ // Determine external address...
+ var extAddr *NetAddress
+ var upnpMap bool
+ if !skipUPNP && (lAddrIP == "" || lAddrIP == "0.0.0.0") {
+ extAddr, err = getUPNPExternalAddress(lAddrPort, listenerPort)
+ upnpMap = err == nil
+ log.WithFields(log.Fields{"module": logModule, "err": err}).Info("get UPNP external address")
+ }
+
+ // Get the IPv4 available
+ if extAddr == nil {
+ if ip, err := ExternalIPv4(); err != nil {
+ log.WithFields(log.Fields{"module": logModule, "err": err}).Warning("get ipv4 external address")
+ log.Panic("get ipv4 external address fail!")
+ } else {
+ extAddr = NewNetAddressIPPort(net.ParseIP(ip), uint16(lAddrPort))
+ log.WithFields(log.Fields{"module": logModule, "addr": extAddr}).Info("get ipv4 external address success")
+ }
+ }
+
+ dl := &DefaultListener{
+ listener: listener,
+ intAddr: intAddr,
+ extAddr: extAddr,
+ connections: make(chan net.Conn, numBufferedConnections),
+ }
+ dl.BaseService = *cmn.NewBaseService(nil, "DefaultListener", dl)
+ dl.Start() // Started upon construction
+ if upnpMap {
+ return dl, true
+ }
+
+ conn, err := net.DialTimeout("tcp", extAddr.String(), 3*time.Second)
+ if err != nil {
+ return dl, false
+ }
+ conn.Close()
+ return dl, true
+}
+
+//OnStart start listener
+func (l *DefaultListener) OnStart() error {
+ l.BaseService.OnStart()
+ go l.listenRoutine()
+ return nil
+}
+
+//OnStop stop listener
+func (l *DefaultListener) OnStop() {
+ l.BaseService.OnStop()
+ l.listener.Close()
+}
+
+//listenRoutine Accept connections and pass on the channel
+func (l *DefaultListener) listenRoutine() {
+ for {
+ conn, err := l.listener.Accept()
+ if !l.IsRunning() {
+ break // Go to cleanup
+ }
+ // listener wasn't stopped,
+ // yet we encountered an error.
+ if err != nil {
+ log.Panic(err)
+ }
+ l.connections <- conn
+ }
+ // Cleanup
+ close(l.connections)
+}
+
+//Connections a channel of inbound connections. It gets closed when the listener closes.
+func (l *DefaultListener) Connections() <-chan net.Conn {
+ return l.connections
+}
+
+//InternalAddress listener internal address
+func (l *DefaultListener) InternalAddress() *NetAddress {
+ return l.intAddr
+}
+
+//ExternalAddress listener external address for remote peer dial
+func (l *DefaultListener) ExternalAddress() *NetAddress {
+ return l.extAddr
+}
+
+// NetListener the returned listener is already Accept()'ing. So it's not suitable to pass into http.Serve().
+func (l *DefaultListener) NetListener() net.Listener {
+ return l.listener
+}
+
+//String string of default listener
+func (l *DefaultListener) String() string {
+ return fmt.Sprintf("Listener(@%v)", l.extAddr)
+}
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