# sshpppd - script to automate the pppd-over-ssh vpn
#  in the UCLA VPN class LAN
#
# Runs from vpnb (100.1.1.1) against vpnd (200.2.2.2)
#  result: sets a bilateral route between them,
#  confers addresses 10.1.1.1 on vpnb's end, 10.2.2.2 on vpnd's
#  traffic through this route is dynamically encrypted
#
# Comparable to script of the Arpad Magosanyi's 1997 vpn HowTo


clear


# ESTABLISH CONNECTION
echo "Making counterpart run his pppd and noting our local pseudo-terminal"
/usr/sbin/pty-redir /usr/bin/ssh -t -l slave 200.2.2.2 /usr/sbin/pppd > /tmp/device
echo "(It\'s `cat /tmp/device`)";echo
sleep 5

echo "Running our local pppd against his, through that pseudo-terminal";echo
pppd `cat /tmp/device` 10.1.1.1:10.2.2.2
sleep 2


# ESTABLISH ROUTING
echo "Setting up a route from here through him to the net behind him";echo
route add -net 192.168.2.0 netmask 255.255.255.0 gw 10.2.2.2
sleep 2
echo "Making him set up a route from there though us to the net behind us";echo
/usr/bin/ssh -t -l root 200.2.2.2 route add -net 192.168.1.0 netmask 255.255.255.0 gw 10.1.1.1


# OUTCOME INFORMATION
echo "Our routing table:"
route -n
echo -e "\nHis routing table:"
/usr/bin/ssh -t -l root 200.2.2.2 route -n