shawwwn / gole Goto Github PK

is it possible to add support for multiple port fowarding, or forwarding port ranges?

The code snippet seems replaceable with io.copy directly.

// Copy copies from src to dst until either EOF is reached
// on src or an error occurs. It returns the number of bytes
// copied and the first error encountered while copying, if any.
//
// A successful Copy returns err == nil, not err == EOF.
// Because Copy is defined to read from src until EOF, it does
// not treat an EOF from Read as an error to be reported.
//
// If src implements the WriterTo interface,
// the copy is implemented by calling src.WriteTo(dst).
// Otherwise, if dst implements the ReaderFrom interface,
// the copy is implemented by calling dst.ReadFrom(src).
func Copy(dst Writer, src Reader) (written int64, err error) {
	return copyBuffer(dst, src, nil)
}

Write like:

func Forward(local *net.TCPConn, remote *net.TCPConn) {
	f := func(src *net.TCPConn, dst *net.TCPConn) {
		defer src.Close()
		defer dst.Close()
		_, err := io.Copy(src, dst)
		if err != nil {
			log.errorf("Fail to copy from src to dst, err=%v", err)
			return
		}
	}
	go f(local, remote)
	go f(remote, local)
}

not really an issue but i am wondering how does gole work without an external server? I thought you absolutely need a server which can actually forward ports and is globally accessible.
is it what server option is for? lets say i am trying to play a p2p game and both players need to know each other's ip and both are behind NAT and cannot forward ports.
how would i do that?

I try to drill a hole as follows
./gole -v tcp 0.0.0.0:3333 112.49.232.96:4444 -op server -fwd=127.0.0.1:8080
./gole -v tcp 0.0.0.0:4444 223.104.51.140:4444 -op client -fwd=127.0.0.1:1111
But it seems unlikely to succeed：

What should I do？

Hello..

first of all. thank you for this amazing project.
however, I have a question/problem?

what if we don't know the "client" public ip address? is there a way to use the tunnel for the sole purpose of port forwarding between point A and point B? so Point A has a static configuration and point B only needs to know point A's public ip and port?

Can this work with openvpn?