Check IP against Mail Blacklists

dnsbl.sh

#!/bin/bash
# -- head.tmpl v0.06 --------------------------------------------------------
BASE=~/projects/mail
export PATH=${PATH}:/usr/bin:/usr/local/sbin:/sbin:/usr/local/bin:${BASE}
[ "`basename -- "$0"|cut -f1 -d.`" = "mk" ] && script=$(basename -- "$0"|cut -f1-2 -d.) || script=$(basename -- "$0"|cut -f1 -d.)
bs=${BASE}/${script}
csv=${bs}.csv; raw=${bs}.raw; log=${bs}.log;   tmp=${bs}.tmp;
in=${bs}.in;   out=${bs}.out; exm=${bs}.exempt
. ~/colors.inc 2>/dev/null

# Check if an IP address is listed on one of the following blacklists
# The format is chosen to make it easy to add or delete
# The shell will strip multiple whitespace

. dnsbl.inc

# simple shell function to show an error message and exit
#  $0  : the name of shell script, $1 is the string passed as argument
# >&2  : redirect/send the message to stderr

ERROR() {
  echo $0 ERROR: $1 >&2
  exit 2
}

# -- Sanity check on parameters
[ $# -ne 1 ] && ERROR 'Please specify a single IP address'

# -- if the address consists of 4 groups of minimal 1, maximal digits, separated by '.'
# -- reverse the order
# -- if the address does not match these criteria the variable 'reverse will be empty'

reverse=$(echo $1|sed -ne "s~^\([0-9]\{1,3\}\)\.\([0-9]\{1,3\}\)\.\([0-9]\{1,3\}\)\.\([0-9]\{1,3\}\)$~\4.\3.\2.\1~p")

if [ "x${reverse}" = "x" ] ; then
      ERROR  "$0: '$1' doesn't look like a valid IP address"
      exit 1
fi

# -- do a reverse ( address -> name) DNS lookup
REVERSE_DNS=$(dig +short -x $1)

echo IP $1 NAME ${REVERSE_DNS:----}

# -- cycle through all the blacklists
for BL in ${BLISTS} ; do
    # show the reversed IP and append the name of the blacklist
    printf "%-60s" " ${reverse}.${BL}."

    # use dig to lookup the name in the blacklist
    #echo "$(dig +short -t a ${reverse}.${BL}. |  tr '\n' ' ')"
    LISTED="$(dig +short -t a ${reverse}.${BL}.)"
    echo ${LISTED:----}
done