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multiarch-build-arg
IamTheFij 2 years ago
parent
commit
57d53b936c
  1. 2
      .dockerignore
  2. 14
      Dockerfile
  3. 18
      Makefile
  4. 22
      README.md
  5. 1
      requirements.txt
  6. 3
      start.sh
  7. 139
      update_ddns.py

2
.dockerignore

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README.md
Makefile

14
Dockerfile

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FROM python:3
RUN mkdir -p /src
WORKDIR /src
COPY ./requirements.txt ./
RUN pip install -r ./requirements.txt
COPY ./start.sh ./
COPY ./update_ddns.py ./update_ddns.py
ENV DOMAIN=""
CMD [ "/src/start.sh" ]

18
Makefile

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DOCKER_TAG ?= cloudflare-ddns-dev-${USER}
default: test
test:
@echo ok
update:
curl -o update_ddns.py https://raw.githubusercontent.com/cloudflare/python-cloudflare/master/examples/example_update_dynamic_dns.py
chmod +x update_ddns.py
build:
docker build . -t ${DOCKER_TAG}
run: build
docker run --rm -e DOMAIN=${DOMAIN} \
-e CF_API_EMAIL=${CF_API_EMAIL} \
-e CF_API_KEY=${CF_API_KEY} \
${DOCKER_TAG}

22
README.md

@ -1,3 +1,21 @@
# docker-cloudflare-ddns
# Docker Cloudfare DDNS
Docker build of a Cloudflare DDNS client using their example code
Simple Docker image to dynamically update a Cloudflare DNS record.
## Usage
All parameters are passed to the script using env variables, so export the following:
DOMAIN=sub.example.com
CF_API_EMAIL=admin@example.com
CF_API_KEY=00000000000000000000
Then run. To execute from this directory, you can use the convenient Make target.
make run
## Development
The script is straight from the examples provided by Cloudflare on their Github. The latest version can be downloaded using:
make update

1
requirements.txt

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cloudflare

3
start.sh

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#! /bin/bash
exec /src/update_ddns.py $DOMAIN

139
update_ddns.py

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#!/usr/bin/env python
"""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 = sys.argv[1]
except IndexError:
exit('usage: example-update-dynamic-dns.py fqdn-hostname')
host_name, zone_name = dns_name.split('.', 1)
ip_address, ip_address_type = my_ip_address()
print('MY IP: %s %s' % (dns_name, ip_address))
cf = CloudFlare.CloudFlare()
# 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()
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