#!/bin/bash
# Send an email when the public ipv4 address changes

if [[ -a /tmp/ipv4_address ]]; then
    CURRENT_IP=$(/usr/bin/dig +short myip.opendns.com @resolver1.opendns.com)
    PREVIOUS_IP=$(cat /tmp/ipv4_address)

    if [[ $CURRENT_IP != $PREVIOUS_IP ]]; then
        echo "IP address changed from $PREVIOUS_IP to $CURRENT_IP" | /usr/bin/mail -s 'IP address changed' sonnyba871@gmail.com 
        echo $CURRENT_IP > /tmp/ipv4_address
        echo "Mail sent"
    fi
else
    echo "$(/home/sonny/dotfiles/scripts/pubip)" > /tmp/ipv4_address
fi