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

listtype=$1
if ! [[ "$listtype" =~ ^[4,6]+$ ]]; then
    echo "first parameter is mandatory and must be either 4 or 6."
    exit 1
fi
rblfile="/var/lib/rbldns/listv$listtype"
maxage=168 # in hours

if [ $listtype -eq 4 ]; then
	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 "DEBUG: 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
fi

# FIXME: ipv6 regex needed
if [ $listtype -eq 6 ]; then
	:
fi

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