#!/bin/bash
# Script Version: 02
# Description: Periodically verify consistency between ns1, ns2, and Google nameserver DNS records for a specific domain.

# Set Variables
# ========
NS1="23.88.113.138"
NS2="116.202.112.180"
GOOGLE_NS="8.8.8.8"
DOMAIN="es1.dynproxy.net"
LOG_FILE="/var/log/dns_health_check.log"

# Main Process
# ========
IP_NS1=$(dig @$NS1 $DOMAIN A +short)
IP_NS2=$(dig @$NS2 $DOMAIN A +short)
IP_GOOGLE=$(dig @$GOOGLE_NS $DOMAIN A +short)

if [ "$IP_NS1" == "$IP_NS2" ] && [ "$IP_NS1" == "$IP_GOOGLE" ]; then
    echo "[$(date)] DNS records are consistent across all nameservers: $IP_NS1" >> "$LOG_FILE"
else
    echo "[$(date)] DNS inconsistency detected!" >> "$LOG_FILE"
    echo "[$(date)] ns1: $IP_NS1, ns2: $IP_NS2, Google: $IP_GOOGLE" >> "$LOG_FILE"
fi