Add DDNS script

cloudflare ddns/cloudflare_ddns.py

@@ -0,0 +1,83 @@
+#!/usr/bin/python3
+# Fetches the public IP and updates the record on Cloudflare which is provided as an argument
+# to match this public record.
+import requests
+import logging
+import sys
+import configparser
+import argparse
+
+
+logging.basicConfig(stream=sys.stdout, level=logging.INFO, format='%(levelname)s - %(message)s')
+
+def get_public_IP():
+    logging.info('Retrieving the public IP for this machine...')
+    response = requests.get('https://api.ipify.org?format=json')
+
+    if response.status_code != 200:
+        raise Exception('Something went wrong requesting the public ip, exiting...')
+
+    public_ip = response.json()['ip']
+    logging.info(f'The public IP address for this machine is: {public_ip}.')
+    return public_ip
+
+def get_zone_id(domain):
+    response = requests.get(f'https://api.cloudflare.com/client/v4/zones?name={domain}', headers=cloudflare_request_headers)
+    
+    if response.status_code != 200:
+        raise Exception('Something went wrong requesting the zone of the domain on Cloudflare...')
+    
+    zone_id = response.json()['result'][0]['id']
+    return zone_id
+
+def get_record_id(zoneId, record):
+    logging.debug('Getting record id...')
+    response = requests.get(f'https://api.cloudflare.com/client/v4/zones/{zoneId}/dns_records?name={record}', headers=cloudflare_request_headers)
+    
+    if response.status_code != 200:
+        raise Exception('Something went wrong requesting the record id of the domain name on Cloudflare...')
+    
+    return response.json()['result'][0]['id']
+
+
+def change_record(subdomain, zoneId, recordId):
+    logging.info(f'Changing record for {subdomain} to point to {publicIP}...')
+    dns_change_response = requests.put(f'https://api.cloudflare.com/client/v4/zones/{zoneId}/dns_records/{recordId}', 
+                    headers=cloudflare_request_headers,
+                    json={
+                        'content': publicIP,
+                        'name': subdomain,
+                        'proxied': False,
+                        'type': 'A',
+                        'comment': 'Is set to change with my DDNS script (on the Raspberry Pi).',
+                        'ttl': 1 # Meaning "Automatic", see: https://developers.cloudflare.com/api/operations/dns-records-for-a-zone-update-dns-record
+                    })
+
+    if dns_change_response.status_code != 200:
+        raise Exception('Something went wrong updating the dns record...')
+    
+    logging.info('Succesfully updated the record ✅!')
+
+parser = argparse.ArgumentParser()
+parser.add_argument('subdomain')
+parser.add_argument('-c', '--credential-file', dest='token')
+
+args = parser.parse_args()
+
+subdomain = args.subdomain
+cloudflare_token_path = args.token
+
+fixedTopLevelDomain = 'kleinendorst.info'
+fullDomainName = f'{subdomain}.{fixedTopLevelDomain}'
+
+publicIP = get_public_IP()
+
+config = configparser.ConfigParser()
+config.read(cloudflare_token_path)
+
+cloudflare_api_credentials = config['credentials']['dns_cloudflare_token']
+cloudflare_request_headers = {'Content-Type': 'application/json', 'Authorization': f'Bearer {cloudflare_api_credentials}'}
+
+zoneId = get_zone_id(fixedTopLevelDomain)
+recordId = get_record_id(zoneId, fullDomainName)
+change_record(subdomain, zoneId, recordId)