From 6be83bd6c137a3c4756dff3fb262fddfb8db819b Mon Sep 17 00:00:00 2001
From: Phil <phil@nncltech.org>
Date: Sun, 23 Jul 2023 11:10:39 +0100
Subject: [PATCH] Added Files

---
 FQDN-Updater.sh | 64 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 FQDN-Updater.sh

diff --git a/FQDN-Updater.sh b/FQDN-Updater.sh
new file mode 100644
index 0000000..ea92304
--- /dev/null
+++ b/FQDN-Updater.sh
@@ -0,0 +1,64 @@
+#!/bin/bash
+
+# Replace 'your_fqdn_here.com' with the actual FQDN you want to update
+fqdn="your_fqdn_here.com"
+
+# Path to the log file where the IP address will be recorded
+log_file="/path/to/ip_log.txt"
+
+# Function to resolve the IP address from FQDN
+get_ip_address() {
+    dig +short $fqdn
+}
+
+# Function to get the last recorded IP address from the log file
+get_last_ip_address() {
+    if [[ -f "$log_file" ]]; then
+        tail -n 1 "$log_file"
+    else
+        echo ""
+    fi
+}
+
+# Check if 'ufw' is installed
+if ! command -v ufw &> /dev/null; then
+    echo "UFW is not installed. Please install it first."
+    exit 1
+fi
+
+# Check if 'dig' (from 'dnsutils') is installed
+if ! command -v dig &> /dev/null; then
+    echo "The 'dnsutils' package is not installed. Please install it first."
+    exit 1
+fi
+
+# Enable UFW if it's not already enabled
+ufw --force enable
+
+# Get the current and last recorded IP addresses
+current_ip=$(get_ip_address)
+last_ip=$(get_last_ip_address)
+
+if [[ -z $current_ip ]]; then
+    echo "Unable to resolve the IP address for '$fqdn'."
+    exit 1
+fi
+
+if [[ $current_ip != $last_ip ]]; then
+    # Remove the old IP address from UFW rules if it exists
+    if [[ -n $last_ip ]]; then
+        ufw delete allow from $last_ip
+    fi
+
+    # Allow traffic from the obtained IP address
+    ufw allow from $current_ip
+    ufw reload
+
+    # Log the current IP address to the file
+    echo "$current_ip" >> "$log_file"
+    
+    echo "UFW has been updated to allow traffic from $fqdn ($current_ip)."
+else
+    echo "IP address for '$fqdn' has not changed. No updates needed."
+fi
+