Dynamic DNS via Cloudflare

cf_dyndns.py

#!/usr/bin/env python


import requests


import conf


url_base = 'https://api.cloudflare.com/client/v4{endpoint}'
urls = { 
        'zone_list': '/zones',
        'record_list': '/zones/{zone_id}/dns_records',
        'record_update': '/zones/{zone_id}/dns_records/{record_id}',
        }

headers = { 
        'X-Auth-Email': conf.API_EMAIL,
        'X-Auth-Key': conf.API_TOKEN,
        }

# Get our IP address
my_ip = requests.get('https://api.ipify.org').text

# Use a Session from here on out for better performance
with requests.Session() as s:
    # Set up our headers
    s.headers.update(headers)
    # Find our zone
    zones = s.get(url_base.format(endpoint=urls['zone_list']))
    for zone in zones.json()['result']:
        if conf.TARGET_DOMAIN.endswith(zone['name']):
            break

    assert conf.TARGET_DOMAIN.endswith(zone['name'])

    # Find our domain record
    records_url = urls['record_list'].format(zone_id=zone['id'])
    records = s.get(url_base.format(endpoint=records_url))
    for record in records.json()['result']:
        if conf.TARGET_DOMAIN == record['name']:
            break

    assert conf.TARGET_DOMAIN == record['name']

    # Update our domain record
    update_url = urls['record_update'].format(zone_id=zone['id'], record_id=record['id'])
    record['content'] = my_ip
    update = s.put(url_base.format(endpoint=update_url), json=record)

    assert update.status_code == 200 
    assert update.json()['success']

conf.py.example

# Copy or rename this file to conf.py
# Then update the values below

# Your Cloudflare API token
API_TOKEN = 'c2547eb745079dac9320b638f5e225cf483cc5cfdda41'
# Your Cloudflare account email address
API_EMAIL = 'user@example.com'

# The DNS record you want to update
TARGET_DOMAIN = 'target.example.com'