How to find which Apache domains have alien NS servers

Here is a script that helps you find which domains configured with Apache have NS es located on different servers.

#!/bin/bash # Bash script to tell which vhosts configured with Apache have alien # NS servers. # Written by Badan Sergiu, http://badan.wordpress.com/ PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" tmpdir=/tmp/alienns httpd=/usr/sbin/httpd # Create temporary directory if it doesn't exist if [ ! -d $tmpdir ]; then mkdir $tmpdir fi # Create a list of IP addresses on the server ifconfig | grep inet | awk '{print $2}' | cut -d: -f2 | sort | uniq > $tmpdir/iplist # Dump all configured vhosts; $httpd -S 2>&1 | grep namevhost | awk '{print $4}' > $tmpdir/allvhosts.txt # select 2nd level domain for domain in $(cat $tmpdir/allvhosts.txt); do echo $domain | awk -F. '{print $(NF-1) "." $NF}' done | sort | uniq > $tmpdir/2domains.txt # find which 2nd level domain has alien IP for domain2 in $(cat $tmpdir/2domains.txt); do for nameserver in $(dig ns $domain2 +short); do nsip=$(dig a $nameserver +short | head -n 1) if [ -z $(grep $nsip $tmpdir/iplist) ]; then echo "alien $nameserver ($nsip) for $domain2" fi done done > $tmpdir/report.txt # print the report case $1 in -v) cat $tmpdir/report.txt ;; *) echo "Following domains have alien NS servers (use -v for verbose):" cat $tmpdir/report.txt | awk '{print $5}' | sort | uniq esac