If you want to use and old computer as a dynamic DNS client to update you IP you can easily do it using the Cloudflare API and a Debian minimal install.
First install the API with:
pip install cloudflare
After create a file somewhere with the code bellow, changing lines 105, 109, 110 and 115 as required.
#!/usr/bin/env python3
"""Cloudflare API code - example"""
from __future__ import print_function
import os
import sys
import re
import json
import requests
sys.path.insert(0, os.path.abspath('..'))
import CloudFlare
def my_ip_address():
"""Cloudflare API code - example"""
# This list is adjustable - plus some v6 enabled services are needed
# url = 'http://myip.dnsomatic.com'
# url = 'http://www.trackip.net/ip'
# url = 'http://myexternalip.com/raw'
url = 'https://api.ipify.org'
try:
ip_address = requests.get(url).text
except:
exit('%s: failed' % (url))
if ip_address == '':
exit('%s: failed' % (url))
if ':' in ip_address:
ip_address_type = 'AAAA'
else:
ip_address_type = 'A'
return ip_address, ip_address_type
def do_dns_update(cf, zone_name, zone_id, dns_name, ip_address, ip_address_type):
"""Cloudflare API code - example"""
try:
params = {'name': dns_name, 'match': 'all', 'type': ip_address_type}
dns_records = cf.zones.dns_records.get(zone_id, params=params)
except CloudFlare.exceptions.CloudFlareAPIError as e:
exit('/zones/dns_records %s - %d %s - api call failed' % (dns_name, e, e))
updated = False
# update the record - unless it's already correct
for dns_record in dns_records:
old_ip_address = dns_record['content']
old_ip_address_type = dns_record['type']
if ip_address_type not in ['A', 'AAAA']:
# we only deal with A / AAAA records
continue
if ip_address_type != old_ip_address_type:
# only update the correct address type (A or AAAA)
# we don't see this becuase of the search params above
print('IGNORED: %s %s ; wrong address family' % (dns_name, old_ip_address))
continue
if ip_address == old_ip_address:
print('UNCHANGED: %s %s' % (dns_name, ip_address))
updated = True
continue
# Yes, we need to update this record - we know it's the same address type
dns_record_id = dns_record['id']
dns_record = {
'name': dns_name,
'type': ip_address_type,
'content': ip_address
}
try:
dns_record = cf.zones.dns_records.put(zone_id, dns_record_id, data=dns_record)
except CloudFlare.exceptions.CloudFlareAPIError as e:
exit('/zones.dns_records.put %s - %d %s - api call failed' % (dns_name, e, e))
print('UPDATED: %s %s -> %s' % (dns_name, old_ip_address, ip_address))
updated = True
if updated:
return
# no exsiting dns record to update - so create dns record
dns_record = {
'name': dns_name,
'type': ip_address_type,
'content': ip_address
}
try:
dns_record = cf.zones.dns_records.post(zone_id, data=dns_record)
except CloudFlare.exceptions.CloudFlareAPIError as e:
exit('/zones.dns_records.post %s - %d %s - api call failed' % (dns_name, e, e))
print('CREATED: %s %s' % (dns_name, ip_address))
def main():
"""Cloudflare API code - example"""
try:
dns_name = "your.subdomain.your.main.domain.com"
except IndexError:
exit('args missing: fqdn-hostname')
host_name = "YOUR.SUBDOMAIN"
zone_name = "YOUR.MAIN.DOMAIN.COM"
ip_address, ip_address_type = my_ip_address()
print('MY IP: %s %s' % (dns_name, ip_address))
cf = CloudFlare.CloudFlare(email="[email protected]", token="CLOUDFLARE_TOKEN")
# grab the zone identifier
try:
params = {'name': zone_name}
zones = cf.zones.get(params=params)
except CloudFlare.exceptions.CloudFlareAPIError as e:
exit('/zones %d %s - api call failed' % (e, e))
except Exception as e:
exit('/zones.get - %s - api call failed' % (e))
if len(zones) == 0:
exit('/zones.get - %s - zone not found' % (zone_name))
if len(zones) != 1:
exit('/zones.get - %s - api call returned %d items' % (zone_name, len(zones)))
zone = zones[0]
zone_name = zone['name']
zone_id = zone['id']
do_dns_update(cf, zone_name, zone_id, dns_name, ip_address, ip_address_type)
exit(0)
if __name__ == '__main__':
main()
You can test if everything is working by running:
python cloudflare_updater.py
If everything is alright, you can create an entry in the crontab database to run every X minutes so the script can keep you ip updated in case it changes