Tunnelblick route traffic based on urls and domains

connected.sh

#!/bin/sh

# Tunnelblick route traffic based on urls and domains

# Configuration at the end of this file:
# 1. Specify tunnel interface
# 2. Enter url/domain which is used to gather IP addresses

# Copy this file to (sudo):
# cd ~/Library/Application\ Support/Tunnelblick/Configurations/{NAME}/Contents/Resources

echo "network connected"

# Test an IP address for validity:
# Usage:
#      valid_ip IP_ADDRESS
#      if [[ $? -eq 0 ]]; then echo good; else echo bad; fi
#   OR
#      if valid_ip IP_ADDRESS; then echo good; else echo bad; fi
#
function valid_ip()
{
    local  ip=$1
    local  stat=1

    if [[ $ip =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
        OIFS=$IFS
        IFS='.'
        ip=($ip)
        IFS=$OIFS
        [[ ${ip[0]} -le 255 && ${ip[1]} -le 255 \
            && ${ip[2]} -le 255 && ${ip[3]} -le 255 ]]
        stat=$?
    fi
    return $stat
}

# VPN INTERFACE
VPN_INTERFACE=utun1
# TARGET URL
IPS=`dig +short somedomain.com`

for IP in $IPS
do
    valid_ip $IP
    if [[ $? -eq 0 ]]; then
    echo "ADDING ROUTE: /sbin/route add -net $IP/32 -interface $VPN_INTERFACE"
    /sbin/route add -net $IP/32 -interface $VPN_INTERFACE
    fi
done