34 lines
1.5 KiB
Bash
34 lines
1.5 KiB
Bash
#!/bin/bash
|
|
# Bash script to query DDNS service for hostname current IP address and create or update UFW firewall rules
|
|
# to allow access to all ports and protocols from the dynamic IP address.
|
|
# This script is intended to be run from a cron job with root privileges.
|
|
# The script will only update the firewall rules if the IP address has changed.
|
|
|
|
# Set the DDNS service URL
|
|
DDNS_HOSTNAME="akanealw.com"
|
|
# Get the DDNS hostname IP address
|
|
DDNS_IP=$(dig +short ${DDNS_HOSTNAME})
|
|
# Get the current IP allowed in UFW for this hostname
|
|
OLD_IP=$(/usr/sbin/ufw status | grep $DDNS_HOSTNAME | head -n1 | tr -s ' ' | cut -f3 -d ' ')
|
|
|
|
# Check if the DDNS hostname IP address is valid
|
|
if [[ "${DDNS_IP}" =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
|
|
# Check if the old IP is valid
|
|
if [[ "${OLD_IP}" =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
|
|
# Check if the DDNS service IP address is different from the old IP address
|
|
if [[ "${DDNS_IP}" != "${OLD_IP}" ]]; then
|
|
# Delete the old rule
|
|
/usr/sbin/ufw delete allow from $OLD_IP to any
|
|
# Create a new rule for the new IP address
|
|
/usr/sbin/ufw allow from "${DDNS_IP}" to any comment $DDNS_HOSTNAME
|
|
else
|
|
echo "$0: The IP address is the same, no need to update the firewall rules."
|
|
fi
|
|
else
|
|
# Create a new rule for the new IP address
|
|
/usr/sbin/ufw allow from "${DDNS_IP}" to any comment $DDNS_HOSTNAME
|
|
fi
|
|
else
|
|
echo "$0: DDNS IP address is not valid for ${DDNS_HOSTNAME}: ${DDNS_IP}"
|
|
fi
|