Inital Commit

On Prem Client Agent/AWS_DDNS/aws_ddns_update.py

@@ -0,0 +1,72 @@
+import requests
+import boto3
+import os
+import json
+import datetime
+import configparser
+
+script_dir = os.path.dirname(os.path.abspath(__file__))
+os.chdir(script_dir)
+
+# File to store the last known IP address
+ip_file = 'last_ip'
+
+# Include config data
+config = configparser.ConfigParser()
+config.read('settings.conf')
+HostedZoneId = config['Settings']['HostedZoneId']
+function_name = config['Settings']['function_name']
+domain_list = config['Domains']['domain_list'].split(',')
+ttl = config['Settings']['TTL']
+ttl = int(ttl)
+
+# Create a Lambda client
+lambda_client = boto3.client('lambda')
+
+def get_public_ip():
+    """Fetch the current public IP address."""
+    response = requests.get("http://checkip.amazonaws.com")
+    return response.text.strip()
+
+def read_last_ip():
+    """Read the last known IP from file."""
+    if os.path.exists(ip_file):
+        with open(ip_file, 'r') as file:
+            return file.read().strip()
+    return None
+
+def write_last_ip(ip):
+    """Write the current IP to file as the last known IP."""
+    with open(ip_file, 'w') as file:
+        file.write(ip)
+
+def invoke_lambda(ip_address, domain_name, HostedZoneId, ttl):
+    """Invoke the Lambda function with the current IP address."""
+    response = lambda_client.invoke(
+        FunctionName=function_name,
+        InvocationType='RequestResponse',
+        Payload=json.dumps({'public_ip': ip_address, 'domain': domain_name, 'zoneId': HostedZoneId, 'ttl': ttl})  # Pass IP and domain as part of the payload
+    )
+    response_payload = response['Payload'].read()
+    print("Lambda response:", response_payload.decode('utf-8'))
+
+def main():
+    current_ip = get_public_ip()
+    last_ip = read_last_ip()
+
+    if current_ip != last_ip:
+        print("Public IP has changed. Updating DNS by invoking AWS lambda Function...")
+        for domain_name in domain_list:
+            current_datetime = datetime.datetime.now()
+            formatted_datetime = current_datetime.strftime("%Y-%m-%d %H:%M:%S")
+            print(formatted_datetime, domain_name, current_ip)
+            invoke_lambda(current_ip, domain_name, HostedZoneId, ttl)
+        write_last_ip(current_ip)
+    else:
+        current_datetime = datetime.datetime.now()
+        formatted_datetime = current_datetime.strftime("%Y-%m-%d %H:%M:%S")
+        print(f"{formatted_datetime}: Public IP has not changed. No update needed, Lambda Not invoked.")
+
+if __name__ == "__main__":
+    main()
+

On Prem Client Agent/AWS_DDNS/settings.conf

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+# Client Settings
+# Parameters under the "Settings" stanza are required for operation, along with at least 1 domain or sub-domain
+
+[Settings]
+# Name of Lambda Function on AWS
+function_name = AWS_DDNS
+
+# Zone ID for Hosted Zone within Route53
+HostedZoneId = Z0960732328DPDEXAMPLE
+
+# TTL to set the domains to upon update (value is in seconds). Set this close to the same duration that the client script will be ran via cron.
+TTL = 300
+
+[Domains]
+
+# Comma separated list of sub-domains to update the "A" record for. (No Spaces between domain names, only a comma) Domains must be members of the above HostedZone within AWS 
+domain_list = example.com,sub1.example.com,sub2.example.com
+