#!/usr/bin/env bash
#
# Expire old RBL records

maxage=48 # in hours
rblfile="/var/lib/rbldns/list"

egrep '^[[:digit:]]{1,3}\.[[:digit:]]{1,3}\.[[:digit:]]{1,3}\.[[:digit:]]{1,3}' $rblfile | while read -r ip delimiter timestamp foo; do
	if [ "$timestamp" -gt "0" ]; then
        	expiration=$(echo "$(date +%s)-$timestamp" | bc)

        	if [ "$expiration" -gt "$(($maxage * 3600))" ]; then
        	        #echo "entry $ip older than $maxage hours (expired $(($expiration / 3600)) hours ago)"
        	        sed -i "/^$ip.*# $timestamp.*$/d" $rblfile || echo "Error while deleting $ip: $?"
        	fi
	fi
done