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tcp.go
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tcp.go
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package portforward
import (
"io"
"net"
"github.com/golang/glog"
)
func (p *portForwarder) startForwardingTCP(address *net.IPAddr, port forwardedPort) error {
listener, err := net.ListenTCP(
port.protocol,
&net.TCPAddr{
IP: address.IP,
Zone: address.Zone,
Port: port.local,
})
if err != nil {
return err
}
go p.waitForConnection(listener, port)
return nil
}
func (p *portForwarder) waitForConnection(listener net.Listener, port forwardedPort) {
for {
conn, err := listener.Accept()
if err != nil {
glog.Errorln("error accepting connection:", err)
return
}
glog.Infof("opening new tcp tunnel to %d", port.remote)
stream, err := p.resource.PortForward(p.name, port.remote, port.protocol)
if err != nil {
glog.Errorf("can't access %s/%s.%s: %v", p.kind, p.name, p.namespace, err)
return
}
go p.handleConnection(conn, stream.AsConn(), port)
}
}
// handleConnection copies data between the local connection and the stream to
// the remote server.
func (p *portForwarder) handleConnection(local, remote net.Conn, port forwardedPort) {
glog.Infof("handling tcp connection for %d", port.local)
errs := make(chan error)
go func() {
_, err := io.Copy(remote, local)
errs <- err
}()
go func() {
_, err := io.Copy(local, remote)
errs <- err
}()
handleConnectionError(<-errs, port)
local.Close()
remote.Close()
handleConnectionError(<-errs, port)
}