Cromebook OpenVPN connection script

openvpn2.sh

#!/bin/sh -e

CONF_DIR=$1
CONFIG="$CONF_DIR/client.ovpn"
RESOLVE_CONF="$CONF_DIR/resolv.conf"
ORIG_RESOLVE_CONF="$CONF_DIR/resolv.conf.orig"

if [ ! -d "$CONF_DIR" ]; then
   echo "Could not find config dir $CONF_DIR" >&2 
   exit 1
fi
if [ ! -f "$CONFIG" ]; then
   echo "Could not find config file $CONFIG" >&2
   exit 1
fi
if [ ! -f "$RESOLVE_CONF" ]; then
   echo "Could not find config file $RESOLVE_CONF" >&2
   exit 1
fi

trap '' 2

# Stop shill and restart it with a nicer attitude towards tun0
sudo stop shill
sudo start shill BLACKLISTED_DEVICES=tun0

# Sleep 10 seconds to allow chromebook to reconnect to the network
sudo sleep 10
sudo openvpn --mktun --dev tun0
sudo sleep 3

# Add DNS on top of current ones, since openvpn command does not do it
sudo cp /var/run/shill/resolv.conf $ORIG_RESOLVE_CONF
sudo mv $RESOLVE_CONF /var/run/shill/resolv.conf 

# Lauch openvpn, finally...
sudo openvpn --config $CONFIG --dev tun0 --auth-retry interact
# When ctrl-c is hit remove tun0 and cleanup the DNS
sudo openvpn --rmtun --dev tun0
if [ -f "$ORIG_RESOLVE_CONF" ]; then
    sudo mv $ORIG_RESOLVE_CONF /var/run/shill/resolv.conf 
fi
trap 2