func (proxy *TCPProxy) Run() {
quit := make(chan bool)
defer close(quit)
utils.Debugf("Starting proxy on tcp/%v for tcp/%v", proxy.frontendAddr, proxy.backendAddr)
for {
client, err := proxy.listener.Accept()
if err != nil {
if utils.IsClosedError(err) {
utils.Debugf("Stopping proxy on tcp/%v for tcp/%v (socket was closed)", proxy.frontendAddr, proxy.backendAddr)
} else {
utils.Errorf("Stopping proxy on tcp/%v for tcp/%v (%v)", proxy.frontendAddr, proxy.backendAddr, err.Error())
}
return
}
go proxy.clientLoop(client.(*net.TCPConn), quit)
}
}
func (proxy *UDPProxy) Run() {
readBuf := make([]byte, UDPBufSize)
utils.Debugf("Starting proxy on udp/%v for udp/%v", proxy.frontendAddr, proxy.backendAddr)
for {
read, from, err := proxy.listener.ReadFromUDP(readBuf)
if err != nil {
// NOTE: Apparently ReadFrom doesn't return
// ECONNREFUSED like Read do (see comment in
// UDPProxy.replyLoop)
if utils.IsClosedError(err) {
utils.Debugf("Stopping proxy on udp/%v for udp/%v (socket was closed)", proxy.frontendAddr, proxy.backendAddr)
} else {
utils.Errorf("Stopping proxy on udp/%v for udp/%v (%v)", proxy.frontendAddr, proxy.backendAddr, err.Error())
}
break
}
fromKey := newConnTrackKey(from)
proxy.connTrackLock.Lock()
proxyConn, hit := proxy.connTrackTable[*fromKey]
if !hit {
proxyConn, err = net.DialUDP("udp", nil, proxy.backendAddr)
if err != nil {
log.Printf("Can't proxy a datagram to udp/%s: %v\n", proxy.backendAddr.String(), err)
continue
}
proxy.connTrackTable[*fromKey] = proxyConn
go proxy.replyLoop(proxyConn, from, fromKey)
}
proxy.connTrackLock.Unlock()
for i := 0; i != read; {
written, err := proxyConn.Write(readBuf[i:read])
if err != nil {
log.Printf("Can't proxy a datagram to udp/%s: %v\n", proxy.backendAddr.String(), err)
break
}
i += written
utils.Debugf("Forwarded %v/%v bytes to udp/%v", i, read, proxy.backendAddr.String())
}
}
}