dnsbl.sh

#!/bin/ksh
#

USAGE="Usage: dnsbl [-b] ipaddress"

set -A RBL_LST "zen.spamhaus.org" "bl.spamcop.net" \
               "b.barracudacentral.org" "cbl.abuseat.org" \
               "hostkarma.junkemailfilter.com"

if [[ $# < 1 || $# > 2 ]]; then
    echo $USAGE
    exit 1
fi
if [[ $1 == "-b" ]]; then
    BLOCK=1
    shift
fi

if [[ $# != 1 ]]; then
    echo $USAGE
    exit 1
fi

ip=${1}

revip=$(IFS=.; set -- $ip ; echo "${4}.${3}.${2}.${1}")

for rbl_server in ${RBL_LST[@]}; do
    result=$(dig +short "${revip}.${rbl_server}")
    if echo ${result} | grep -q "127\.0\.0\.2"; then
        [[ $BLOCK == 1 ]] && {
            sudo spamdb -t -a $ip
            echo -n "blocking "
        }
        echo -n "${ip} found on ${rbl_server}\n"
        break
    fi
done