#!/bin/sh
# The script helps you with the programm 'redirect'. With this program you can access a host via another.
#
# Autor Thorsten Gunkel <tgunkel@gmx.de>
#
# Syntax:  my_redirect Host_youre_interessted_in temp_port
# Example: www.bib.informatik.th-darmstadt.de 1115
#          would allow access to www... via port 1115 on the machine where this script is started
#

# Try to find out your hostname. Don't know if who -l is the best way to do it.
your_name=`whoami`
yourhost_name=`who -l | grep "$your_name" | sed s/.*\(// | sed s/\).*// | tail -1`

# Try to find out the official name of localhost. Sadly some hostname version are quite stuipd
gate_name=`hostname`
gate_port="$2"

# http as dest_port seems a commen default
dest_name="$1"
dest_port=80

# Tell the user what happens
echo "This Script uses 3 Hosts."
echo
echo "1. The host where you are."
echo "   -> I think this is: $yourhost_name."
echo
echo "2. The host where this script is started."
echo "   -> I guess this is: $gate_name."
echo "   You have to tell this script as the 2. parameter a port at this host you can access to."

# No I'm not mad, some test versions are
if [ "X$gate_port" = "X" ]; then
  echo "   *** As you didn't specify a 2. paramter I will select one for you. ***"
  gate_port="1122"
fi

echo "   -> I will use: $gate_port."
echo
echo "3. The host you want acces via 2. This is the 1. parameter this script expects"

# Again, blame test not me
if [ "X$dest_name" = "X" ]; then
  echo "   *** As you didn't specify a 1. paramter I will select one for you. ***"
  dest_name="www.bib.informatik.th-darmstadt.de"
fi

echo "   -> I will use: $dest_name."
echo "   -> port: $dest_port".
echo

# This should make things clear
echo "In short: $yourhost_name can access $dest_name:$dest_port via $gate_name:$gate_port"
echo

# That's all
redirect $yourhost_name $gate_port $dest_name $dest_port