#!/bin/sh

# Evaggelos Balaskas <ebalaskas@ebalaskas.gr>
# Last change: Mon Feb 21 23:48:53 GMT-2 2011
# If you can spare a dollar, plz donate !

clear
echo "Give me server's name: "
read SERVER
echo "Give me ssh port: "
read PORT
SIP=`host $SERVER|tail -1 | awk '{print $NF}'`
DGW=`ip route show | grep default | awk '{print $3}'`

ssh -fw any:any $SIP -p $PORT 'ifconfig tun0 down; \
ifconfig tun0 10.20.30.40 pointopoint 10.20.30.41; \
echo 1 > /proc/sys/net/ipv4/ip_forward;
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE;
grep nameserver /etc/resolv.conf ' > /etc/resolv.conf

# Configure  Client tun0 --> point-to-point with server tun0
ifconfig tun0 down
ifconfig tun0 10.20.30.41 pointopoint 10.20.30.40

# Configure Routing
route add -host $SIP dev eth0
route add default gw 10.20.30.40 dev tun0
route del default gw $DGW dev eth0