#!/bin/bash
# Script Version: 07
# Description: Monitor SOA for dynproxy.net and play a sound when it changes to ns1.dynproxy.net.

# Set variables
# ========
DOMAIN="dynproxy.net"
EXPECTED_NS="ns1.dynproxy.net."
SOUND_CMD="paplay /usr/share/sounds/freedesktop/stereo/alarm-clock-elapsed.oga"
CHECK_INTERVAL=60 # Interval in seconds

# Functions
# ========
get_soa() {
    dig "$DOMAIN" SOA +short | awk '{print $1}'
}

play_sound() {
    $SOUND_CMD
}

# Main Process
# ========
echo "Monitoring SOA for $DOMAIN. Expected NS: $EXPECTED_NS"
LAST_SOA=""

while true; do
    CURRENT_SOA=$(get_soa)

    if [[ -z "$CURRENT_SOA" ]]; then
        echo "Error fetching SOA record. Network issue or domain unreachable."
        sleep $CHECK_INTERVAL
        continue
    fi

    if [[ "$CURRENT_SOA" != "$LAST_SOA" ]]; then
        echo "SOA changed! New SOA: $CURRENT_SOA"
        LAST_SOA="$CURRENT_SOA"

        if [[ "$CURRENT_SOA" == "$EXPECTED_NS" ]]; then
            echo "SOA matches expected NS. Playing sound..."
            play_sound
        fi
    fi
    sleep $CHECK_INTERVAL
done