#!/bin/bash

# https://stackoverflow.com/questions/13777387/check-for-ip-validity
function validip () {
    local ip=$1
    if [ -z $ip ] || ! [[ $ip =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
        return 1
    else
        return 0
    fi
}