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183 lines
3.9 KiB
183 lines
3.9 KiB
package p2p
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import (
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"fmt"
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"net"
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"strconv"
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"sync/atomic"
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. "github.com/tendermint/tendermint/common"
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"github.com/tendermint/tendermint/p2p/upnp"
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)
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/*
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Listener is part of a Server.
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*/
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type Listener interface {
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Connections() <-chan net.Conn
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ExternalAddress() *NetAddress
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Stop()
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}
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/*
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DefaultListener is an implementation of Listener.
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*/
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type DefaultListener struct {
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listener net.Listener
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extAddr *NetAddress
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connections chan net.Conn
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stopped uint32
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}
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const (
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numBufferedConnections = 10
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defaultExternalPort = 8770
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)
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func splitHostPort(addr string) (host string, port int) {
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host, portStr, err := net.SplitHostPort(addr)
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if err != nil {
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panic(err)
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}
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port, err = strconv.Atoi(portStr)
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if err != nil {
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panic(err)
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}
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return host, port
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}
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func NewDefaultListener(protocol string, lAddr string) Listener {
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// Local listen IP & port
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lAddrIP, lAddrPort := splitHostPort(lAddr)
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// Create listener
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listener, err := net.Listen(protocol, lAddr)
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if err != nil {
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panic(err)
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}
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// Actual listener local IP & port
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listenerIP, listenerPort := splitHostPort(listener.Addr().String())
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log.Debug("Local listener: %v:%v", listenerIP, listenerPort)
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// Determine external address...
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var extAddr *NetAddress
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// If the lAddrIP is INADDR_ANY, try UPnP
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if lAddrIP == "" || lAddrIP == "0.0.0.0" {
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extAddr = getUPNPExternalAddress(lAddrPort, listenerPort)
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}
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// Otherwise just use the local address...
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if extAddr == nil {
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extAddr = getNaiveExternalAddress(listenerPort)
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}
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if extAddr == nil {
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panic("Could not determine external address!")
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}
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dl := &DefaultListener{
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listener: listener,
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extAddr: extAddr,
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connections: make(chan net.Conn, numBufferedConnections),
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}
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go dl.listenRoutine()
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return dl
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}
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// TODO: prevent abuse, esp a bunch of connections coming from the same IP range.
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func (l *DefaultListener) listenRoutine() {
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for {
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conn, err := l.listener.Accept()
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if atomic.LoadUint32(&l.stopped) == 1 {
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break // Go to cleanup
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}
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// listener wasn't stopped,
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// yet we encountered an error.
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if err != nil {
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panic(err)
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}
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l.connections <- conn
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}
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// Cleanup
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close(l.connections)
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for _ = range l.connections {
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// Drain
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}
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}
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// A channel of inbound connections.
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// It gets closed when the listener closes.
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func (l *DefaultListener) Connections() <-chan net.Conn {
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return l.connections
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}
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func (l *DefaultListener) ExternalAddress() *NetAddress {
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return l.extAddr
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}
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func (l *DefaultListener) Stop() {
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if atomic.CompareAndSwapUint32(&l.stopped, 0, 1) {
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l.listener.Close()
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}
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}
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func (l *DefaultListener) String() string {
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return fmt.Sprintf("Listener(@%v)", l.extAddr)
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}
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/* external address helpers */
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// UPNP external address discovery & port mapping
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func getUPNPExternalAddress(externalPort, internalPort int) *NetAddress {
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log.Debug("Getting UPNP external address")
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nat, err := upnp.Discover()
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if err != nil {
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log.Debug("Could not get UPNP extrernal address: %v", err)
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return nil
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}
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ext, err := nat.GetExternalAddress()
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if err != nil {
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log.Debug("Could not get UPNP external address: %v", err)
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return nil
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}
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// UPnP can't seem to get the external port, so let's just be explicit.
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if externalPort == 0 {
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externalPort = defaultExternalPort
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}
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externalPort, err = nat.AddPortMapping("tcp", externalPort, internalPort, "tendermint", 0)
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if err != nil {
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log.Debug("Could not get UPNP external address: %v", err)
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return nil
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}
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log.Debug("Got UPNP external address: %v", ext)
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return NewNetAddressIPPort(ext, uint16(externalPort))
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}
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// TODO: use syscalls: http://pastebin.com/9exZG4rh
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func getNaiveExternalAddress(port int) *NetAddress {
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addrs, err := net.InterfaceAddrs()
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if err != nil {
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Panicf("Unexpected error fetching interface addresses: %v", err)
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}
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for _, a := range addrs {
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ipnet, ok := a.(*net.IPNet)
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if !ok {
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continue
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}
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v4 := ipnet.IP.To4()
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if v4 == nil || v4[0] == 127 {
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continue
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} // loopback
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return NewNetAddressIPPort(ipnet.IP, uint16(port))
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}
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return nil
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}
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