random_scripts/check_ptr.sh

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#!/bin/bash
# Test if any IP4 and IP6 addresses of a hostname blocked on a DNSBL
# 2024-02-23
# by Sandros
# Parameter check
if [[ $# -ne 1 ]]; then
echo "Usage: ./${0##*/} <hostname>"
exit 1
fi
DNS="84.2.44.1"
# Get IPs
IPS="$(dig +short $1 A @$DNS | sort -u) $(dig +short $1 AAAA @$DNS | sort -u)"
# Loop through IPs
fails=0
for IP in $IPS; do
# Performs the actual lookup against blacklists
RESULT=$(host $IP $DNS | tail -1 | rev | cut -d" " -f1 | rev | sed 's/.$//')
if [ "$RESULT" != "$1" ]; then
((fails++))
fi
done
echo $fails
exit 0