#!/bin/bash -xe

function print_usage {
	echo \
"
	usage: $0 PORT REMOTE_PORT user@proxy
	script that sets up a reverse ssh tunnel, and optionally starts a VNC server as well if the START_VNC environment variable is not null
	PORT is the port that your techy needs access to. In general, for graphical issues use 5900 and for command-line issues use 22
	REMOTE_PORT is the port that you'll get on the proxy server, any number over 1000 works as long as you and your techy plug in the same number
	USER is just your username at the remote proxy machine, if left blank it is assumed to be the same as your username on your local machine
"
}

[ -n $@ ] || print_usage

PORT_TO_FORWARD=$1
REMOTE_PORT=$2
USER=${3:-$(whoami)}

ssh -T -R $REMOTE_PORT:localhost:$PORT_TO_FORWARD $USER