Here's a quick Python script I wrote that, when provided with your Cloudflare account email address and API token, can update a DNS entry for you. It's designed to be used in a cron job but can be run one-off as well.
#!/usr/bin/env python import argparse import CloudFlare import logging import requests def public_ip(service='http://ip.mrkc.me'): """ Get the apparent public IP of this computer. This does not imply that the necessary network configurations are in place to allow public access. Raises Exceptions for anything but a 200 response. :param service: the url to perform a GET against (should return only an IP) :type service: str :returns: this machine's IP as seen by a server on the Internet :rtype: str """ logging.debug("Looking up public IP") r = requests.get(service) r.raise_for_status() logging.debug("Found " + r.text) return r.text def update_cf_dns(cf, name, ip_address): # 'AAAA' for IPv6, 'A' for IPv4 (default) if ':' in ip_address: ip_address_type = 'AAAA' else: ip_address_type = 'A' logging.debug("Address type " + ip_address_type) # Get the Zone ID logging.debug("Looking up zone id for " + name) for zone in cf.zones.get(): if '.'.join(name.split('.')[-2:]) in zone['name']: zone_id = zone['id'] logging.debug("Found " + zone_id) break else: raise Exception("Unable to find zone id for " + name) # Get the DNS record logging.debug("Fetching DNS record") dns_record = cf.zones.dns_records.get(zone_id, params={'name': name, 'match': 'all', 'type': ip_address_type})[0] logging.debug("Found " + dns_record['id']) # Check to see if the IP has changed if dns_record['content'] != ip_address: logging.info("Performing DSN record update", dns_record['content'], "->", ip_address) cf.zones.dns_records.put(zone_id, dns_record['id'], data={'name': name, 'type': ip_address_type, 'content': ip_address}) else: logging.debug("Old Address:" + dns_record['content'] + "New Address:" + ip_address) logging.info("Not updating") def main(): parser = argparse.ArgumentParser() parser.add_argument('--email', type=str, required=True) parser.add_argument('--token', type=str, required=True) parser.add_argument('--domain', type=str, required=True, help='the domain name to update') args = parser.parse_args() logging.basicConfig(format='%(asctime)s %(message)s', level=logging.INFO) cf = CloudFlare.CloudFlare(email=args.email, token=args.token) update_cf_dns(cf, args.domain, public_ip()) if __name__ == '__main__': main() You can then invoke it with a cron job:
*/15 * * * * /root/updatedns.py --email cfemail@domain.tld --token TOKEN --domain something.com 2>&1 | logger -t "updatedns.py" 
Top comments (0)