loop through cpanel server domains and check if they resolve # and if their first nameserver matches one of our nameserver ip's

check_domains.sh

#!/bin/bash

# loop through server domains and check if they resolve
# and if their first nameserver matches one of our nameserver ip's

in_array() {
  needle="$1"
  shift
  haystack=("$@")
  for i in "${haystack[@]}"; do
    if [[ "$i" == "$needle" ]]; then
      echo 1
      return
    fi
  done
  echo 0
  return
}

# our nameserver ip's
possible_ips=('67.225.159.27' '155.138.228.129' '108.61.220.172' '104.238.173.9' '104.238.149.200')

echo "domain,owner,ipaddress,nameserver,nameserver_ip,reason"

while IFS=': ' read domain owner
do

  nameserver=`dig +short NS "$domain" | head -n 1`
  # if $nameserver is empty
  if [ -z "$nameserver" ];then
    echo "$domain","$owner","na","na","na","no nameservers"
    continue
  fi
  nameserver_ip=`dig +short "$nameserver" | head -n 1`
  # if nameserver has no ip address
  if [ -z "$nameserver_ip" ];then
    echo "$domain","$owner","na","$nameserver","na","nameserver does not resolve"
    continue
  fi
  # not one of our nameservers
  ip_address=`dig +short "$domain" | head -n 1`
  nameserver_check=`in_array "$nameserver_ip" "${possible_ips[@]}"`
  if [ "$nameserver_check" -eq "0" ];then
    echo "$domain","$owner","$ip_address","$nameserver","$nameserver_ip","not our nameserver"
    continue
  fi
  echo "$domain","$owner","$ip_address","$nameserver","$nameserver_ip","status good"
done < /etc/trueuserdomains