#!/bin/bash
###########################################################################
##  Copyright (C) Wizardry and Steamworks 2013 - License: GNU GPLv3      ##
##  Please see: http://www.gnu.org/licenses/gpl.html for legal details,  ##
##  rights of fair usage, the disclaimer and warranty conditions.        ##
###########################################################################

###########################################################################
##                            CONFIGURATION                              ##
###########################################################################

# Set this to the cloudflare zone name.
ZONE='zone.com'
# Set this to the A record name.
RECORD_NAME='www.zone.com'
# Set this to your account e-mail address.
EMAIL='support@zone.com'
# Set this to your API key.
API_KEY='336d5ebc5436534e61d16e63ddfca327'
# This is a list of IPs to fail over. The preceedence 
# is from left to right. The script will attempt the 
# first address, then the second address, etc...
IPS=( 63.143.64.40 24.165.34.50 )

###########################################################################
##                               INTERNALS                               ##
###########################################################################

for ip in "${IPS[@]}"; do
  IP=`ifconfig | grep $ip | grep 'inet addr:' | cut -d: -f2 | awk '{ print $1 }'`
  if [ -z $IP ]; then
    continue
  fi

  FLARE=$(curl -s https://www.cloudflare.com/api_json.html \
    -d 'a=rec_load_all' \
    -d "tkn=$API_KEY" \
    -d "email=$EMAIL" \
    -d "z=$ZONE")

  RECORD_ID=`echo $FLARE | sed -E "s/.*\"rec_id\":\"([0-9]+?)\",.*,\"zone_name\":\"($ZONE)\",.*,\"type\":\"A\",.*/\1/"`

  FLARE=$(curl -s https://www.cloudflare.com/api_json.html \
    -d 'a=rec_edit' \
    -d "tkn=$API_KEY" \
    -d "id=$RECORD_ID" \
    -d "email=$EMAIL" \
    -d "z=$ZONE" \
    -d 'type=A' \
    -d "name=$RECORD_NAME" \
    -d "content=$IP" \
    -d 'service_mode=1' \
    -d 'ttl=1')

  RESULT=`echo $FLARE | sed -E "s/.*,\"result\":\"(.*?)\",.*/\1/"`

  if [ $RESULT == "success" ]; then
    echo "A record for $RECORD_NAME updated to: $IP"
    exit 0
  fi
  exit 1
done