fix network routing issues caused by Cisco AnyConnect with VirtualBox and boot2docker on Mac OS X

vpn_fix.sh

#!/usr/bin/env bash

# Fix network routing issues caused by Cisco AnyConnect VPN when using
# VirtualBox and boot2docker on Mac OS X.
#
# Environment:
#   Mac OS X 10.9.5
#   VirtualBox 4.3.20
#   Cisco AnyConnect 3.1.04074
#   boot2docker v1.4.1 (Git commit: 43241cb)

[ $(id -u) = 0 ] || { echo "You must be root (or use 'sudo')" ; exit 1; }

# Add route to be able to connect to boot2docker VM
docker_interface=$(sudo -u $(logname) VBoxManage showvminfo boot2docker-vm | grep -o -E 'vboxnet\d\d?')
if [ -z "${docker_interface}" ]; then
    echo "No docker VM found"
    exit 1
else
    echo "Found docker interface at $(tput setaf 1)${docker_interface}$(tput sgr0). Updating routes ..."

    # Disconnect Cisco VPN because it does not allow changes to route table
    echo "Disconnecting VPN ..."
    CISCO_PATH=$(dirname $(find /opt/cisco -depth -name vpnagentd))
    VPN="$CISCO_PATH/vpn"
    : ${CISCO_PATH:?"Can't find Cisco path"}
    : ${VPN_HOST:?"Need to set VPN_HOST"}
    : ${VPN_USER:?"Need to set VPN_USER"}
    "$VPN" disconnect > /dev/null

    current_route=$(netstat -rn | grep 192.168.59)
    if [ -z "${current_route}" ]; then
        # no route, let's add it!
        route -nv add -net 192.168.59 -interface ${docker_interface} > /dev/null
    else
        route -nv change -net 192.168.59 -interface ${docker_interface} > /dev/null
    fi

    if [ $? == 0 ]; then
        echo "$(tput setaf 2)[OK]$(tput sgr0)"
    else
        echo "$(tput setaf 1)[FAIL]$(tput sgr0)"
        exit 1
    fi
    netstat -rn | grep 192.168.59

    # Reconnect VPN, get password from keychain
    echo "Reconnecting VPN ..."
    echo -e "$VPN_USER\n$(security find-generic-password -s AnyConnect -w)" | "$VPN" -s connect $VPN_HOST >/dev/null
    "$VPN" state
fi

fwrule=`ipfw -a list | grep "deny ip from any to any"`
fwrule_id=`echo $fwrule | awk '{ print $1 }'`
if [ "$fwrule" != "" ]; then
    echo "Found blocking firewall rule: $(tput setaf 1)${fwrule}$(tput sgr0)"
    printf "Deleting rule ${fwrule_id} ... "
    ipfw delete ${fwrule_id}
    if [ $? == 0 ]; then
    echo "$(tput setaf 2)[OK]$(tput sgr0)"
    else
        echo "$(tput setaf 1)[FAIL]$(tput sgr0)"
        exit 1
    fi
else
    echo "No blocking firewall rules found."
fi