You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
184 lines
4.0 KiB
184 lines
4.0 KiB
package p2p
|
|
|
|
import (
|
|
"fmt"
|
|
"net"
|
|
"strconv"
|
|
"sync/atomic"
|
|
|
|
. "github.com/tendermint/tendermint/binary"
|
|
. "github.com/tendermint/tendermint/common"
|
|
"github.com/tendermint/tendermint/p2p/upnp"
|
|
)
|
|
|
|
/*
|
|
Listener is part of a Server.
|
|
*/
|
|
type Listener interface {
|
|
Connections() <-chan net.Conn
|
|
ExternalAddress() *NetAddress
|
|
Stop()
|
|
}
|
|
|
|
/*
|
|
DefaultListener is an implementation of Listener.
|
|
*/
|
|
type DefaultListener struct {
|
|
listener net.Listener
|
|
extAddr *NetAddress
|
|
connections chan net.Conn
|
|
stopped uint32
|
|
}
|
|
|
|
const (
|
|
numBufferedConnections = 10
|
|
defaultExternalPort = 8770
|
|
)
|
|
|
|
func splitHostPort(addr string) (host string, port int) {
|
|
host, portStr, err := net.SplitHostPort(addr)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
port, err = strconv.Atoi(portStr)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
return host, port
|
|
}
|
|
|
|
func NewDefaultListener(protocol string, lAddr string) Listener {
|
|
// Local listen IP & port
|
|
lAddrIP, lAddrPort := splitHostPort(lAddr)
|
|
|
|
// Create listener
|
|
listener, err := net.Listen(protocol, lAddr)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
// Actual listener local IP & port
|
|
listenerIP, listenerPort := splitHostPort(listener.Addr().String())
|
|
log.Debug("Local listener: %v:%v", listenerIP, listenerPort)
|
|
|
|
// Determine external address...
|
|
var extAddr *NetAddress
|
|
// If the lAddrIP is INADDR_ANY, try UPnP
|
|
if lAddrIP == "" || lAddrIP == "0.0.0.0" {
|
|
extAddr = getUPNPExternalAddress(lAddrPort, listenerPort)
|
|
}
|
|
// Otherwise just use the local address...
|
|
if extAddr == nil {
|
|
extAddr = getNaiveExternalAddress(listenerPort)
|
|
}
|
|
if extAddr == nil {
|
|
panic("Could not determine external address!")
|
|
}
|
|
|
|
dl := &DefaultListener{
|
|
listener: listener,
|
|
extAddr: extAddr,
|
|
connections: make(chan net.Conn, numBufferedConnections),
|
|
}
|
|
|
|
go dl.listenRoutine()
|
|
|
|
return dl
|
|
}
|
|
|
|
// TODO: prevent abuse, esp a bunch of connections coming from the same IP range.
|
|
func (l *DefaultListener) listenRoutine() {
|
|
for {
|
|
conn, err := l.listener.Accept()
|
|
|
|
if atomic.LoadUint32(&l.stopped) == 1 {
|
|
break // Go to cleanup
|
|
}
|
|
|
|
// listener wasn't stopped,
|
|
// yet we encountered an error.
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
l.connections <- conn
|
|
}
|
|
|
|
// Cleanup
|
|
close(l.connections)
|
|
for _ = range l.connections {
|
|
// Drain
|
|
}
|
|
}
|
|
|
|
// A channel of inbound connections.
|
|
// It gets closed when the listener closes.
|
|
func (l *DefaultListener) Connections() <-chan net.Conn {
|
|
return l.connections
|
|
}
|
|
|
|
func (l *DefaultListener) ExternalAddress() *NetAddress {
|
|
return l.extAddr
|
|
}
|
|
|
|
func (l *DefaultListener) Stop() {
|
|
if atomic.CompareAndSwapUint32(&l.stopped, 0, 1) {
|
|
l.listener.Close()
|
|
}
|
|
}
|
|
|
|
func (l *DefaultListener) String() string {
|
|
return fmt.Sprintf("Listener(@%v)", l.extAddr)
|
|
}
|
|
|
|
/* external address helpers */
|
|
|
|
// UPNP external address discovery & port mapping
|
|
func getUPNPExternalAddress(externalPort, internalPort int) *NetAddress {
|
|
log.Debug("Getting UPNP external address")
|
|
nat, err := upnp.Discover()
|
|
if err != nil {
|
|
log.Debug("Could not get UPNP extrernal address: %v", err)
|
|
return nil
|
|
}
|
|
|
|
ext, err := nat.GetExternalAddress()
|
|
if err != nil {
|
|
log.Debug("Could not get UPNP external address: %v", err)
|
|
return nil
|
|
}
|
|
|
|
// UPnP can't seem to get the external port, so let's just be explicit.
|
|
if externalPort == 0 {
|
|
externalPort = defaultExternalPort
|
|
}
|
|
|
|
externalPort, err = nat.AddPortMapping("tcp", externalPort, internalPort, "tendermint", 0)
|
|
if err != nil {
|
|
log.Debug("Could not get UPNP external address: %v", err)
|
|
return nil
|
|
}
|
|
|
|
log.Debug("Got UPNP external address: %v", ext)
|
|
return NewNetAddressIPPort(ext, UInt16(externalPort))
|
|
}
|
|
|
|
// TODO: use syscalls: http://pastebin.com/9exZG4rh
|
|
func getNaiveExternalAddress(port int) *NetAddress {
|
|
addrs, err := net.InterfaceAddrs()
|
|
if err != nil {
|
|
Panicf("Unexpected error fetching interface addresses: %v", err)
|
|
}
|
|
|
|
for _, a := range addrs {
|
|
ipnet, ok := a.(*net.IPNet)
|
|
if !ok {
|
|
continue
|
|
}
|
|
v4 := ipnet.IP.To4()
|
|
if v4 == nil || v4[0] == 127 {
|
|
continue
|
|
} // loopback
|
|
return NewNetAddressIPPort(ipnet.IP, UInt16(port))
|
|
}
|
|
return nil
|
|
}
|