fix vpn route

fix_route

[cronjob]
*/5 * * * * /some/path/vpn/fix_route.sh

===
[fix_route.sh]
#!/bin/bash
# Sets the correct route to send all traffic through VPN

iface_gw=$(/sbin/route -n|grep -P "^(0\.){3}0\s+(\d+\.){3}\d+\s+(0\.){3}0\s+"|awk '{print $NF}')
default_gw=$(/sbin/route -n|grep -P "^(0\.){3}0\s+(\d+\.){3}\d+\s+(0\.){3}0\s+"|awk '{print $2}')
correct_iface="tun0"
current_ip=$(/some/path/vpn/vpn_ip.sh)
if [ $? -ne 0 ] # Not using VPN Tunnel
then
  exit 0
fi

if [ $iface_gw != $correct_iface ]
then
  sudo route del -net 0.0.0.0 gw $default_gw
  sudo route add -net 0.0.0.0/0 dev tun0
fi

exit 0