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# ionos_dyndns.py
Create and update DNS records for a host using IONOS' API for use as a DynDNS (for example via a cronjob).
The script will create A and/or AAAA records if none already exists for the host and update existing ones to reflect the new public IP.
The public IP-Address is determined in two ways:
- **IPv4**: uses the **ipify.org** API
- **IPv6**: uses the `ip address show` command
By default the name of the A/AAAA record that will be created/updated is one that matches the output from the command `hostname -f`.<br>
Update your `/etc/hosts` file with your FQDN if it's not already there.<br>
Alternatively you can override this default value by using the `-H` or `--fqdn` parameter.
## Requirements
- Linux
- Python 3
- IONOS API key
You can create an API key here: https://developer.hosting.ionos.de/keys<br>
The API is still in Beta and not enabled by default. In my case I had to call the customer support hotline and request to be enabled for the API.
## Usage
### Cronjob
This example shows how to update the AAAA record every 5 minutes and save the script output to a file:
1. Download the script and make sure it is executable
```sh
wget https://raw.githubusercontent.com/lazaroblanc/IONOS-DynDNS/main/ionos_dyndns.py
chmod +x ionos_dyndns.py
```
2. Open your crontab file with `crontab -e`
3. Paste this line:
```sh
*/5 * * * * ./ionos_dyndns.py --AAAA --api-prefix $publicprefix --api-secret $secret >> ionos_dyndns.log
```
### General
```
usage: ionos_dyndns.py [-h] [-4] [-6] [-i] [-H] --api-prefix --api-secret
Create and update DNS records for this host using IONOS' API to use as a sort of DynDNS (for example via a cronjob).
optional arguments:
-h, --help show this help message and exit
-4, --A Create/Update A record
-6, --AAAA Create/Update AAAA record
-i , --interface Interface name for determining the public IPv6 address (Default: eth0)
-H , --fqdn Host's FQDN (Default: hostname -f)
--api-prefix API key publicprefix
--api-secret API key secret
```
## Ideas / To-do
- [ ] improve log messages (add a timestamp)
- [ ] refactor duplicate code (~ line 94)
<div align="center">
<hr>
<table>
<tr>
<td colspan=2>
<h2>🐛 Bug reports & Feature requests 🆕</h2>
If you've found a bug or want to request a new feature please <a href="https://github.com/lazaroblanc/IONOS-DynDNS/issues/new">open a new <b>Issue</b></a>
<br><br>
</td>
</tr>
<tr>
<td>
<h2>🤝 Contributing</h2>
✅ Pull requests are welcome!
<br><br>
</td>
<td>
<h2>📃 License</h2>
Published under the <b>Apache License 2.0</b><br>
Please see the <a href="./LICENSE"><b>License</b></a> for details
<br><br>
</td>
</tr>
</table>
</div>

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#!/usr/bin/env python3
# Author: Lázaro Blanc
# GitHub: https://github.com/lazaroblanc
# Usage example: ./ionos_dyndns.py --A --AAAA --api-prefix <api_prefix> --api-secret <api_secret>
import subprocess # Getting IPv6 address from systools instead of via web API
import re # Just regex stuff
import requests # Talk to the API
import json # Work with the API responses
from argparse import ArgumentParser, RawDescriptionHelpFormatter # Commandline argument parsing
def parse_cmdline_args():
argparser = ArgumentParser(
description="Create and update DNS records for this host using IONOS' API to use as a sort of DynDNS (for example via a cronjob).",
epilog="Author: Lázaro Blanc\nGitHub: https://github.com/lazaroblanc",
formatter_class=RawDescriptionHelpFormatter
)
argparser.add_argument(
"-4", "--A",
default=False,
action="store_const",
const=True,
help="Create/Update A record"
)
argparser.add_argument(
"-6", "--AAAA",
default=False,
action="store_const",
const=True,
help="Create/Update AAAA record"
)
argparser.add_argument(
"-i", "--interface",
default="eth0",
action="store",
metavar="",
help="Interface name for determining the public IPv6 address (Default: eth0)"
)
argparser.add_argument(
"-H", "--fqdn",
default=subprocess.getoutput(f"hostname -f"),
action="store",
metavar="",
help="Host's FQDN (Default: hostname -f)"
)
argparser.add_argument(
"--api-prefix",
required=True,
action="store",
metavar="",
help="API key publicprefix"
)
argparser.add_argument(
"--api-secret",
required=True,
action="store",
metavar="",
help="API key secret"
)
args = argparser.parse_args()
if not args.A and not args.AAAA:
argparser.print_help()
exit()
return args
# Map args to global variables
args = parse_cmdline_args()
fqdn = args.fqdn
api_url = "https://api.hosting.ionos.com/dns/v1/zones"
api_key_publicprefix = args.api_prefix
api_key_secret = args.api_secret
api_headers = {
"accept": "application/json",
"X-API-Key": f"{api_key_publicprefix}.{api_key_secret}"
}
interface = args.interface
def main():
domain = get_domain_from_fqdn(fqdn)
zone = get_zone(domain)
all_records = get_all_records_for_fqdn(zone["id"], fqdn)
records_to_create = []
records_to_update = []
# Code duplication, could use some refactoring but I don't have time for this atm
if args.A:
ipv4_address = get_ipv4_address()
print("Public IPv4: " + ipv4_address)
if filter_records_by_type(all_records, "A"):
if filter_records_by_type(all_records, "A")[0]["content"] == ipv4_address:
print("A record is up-to-date")
else:
print("A record is outdated")
records_to_update.append(
new_record(fqdn, "A", ipv4_address, 60))
else:
print("No A record found")
records_to_create.append(new_record(fqdn, "A", ipv4_address, 60))
if args.AAAA:
ipv6_address = get_ipv6_address(interface)
print("Public IPv6: " + ipv6_address)
if filter_records_by_type(all_records, "AAAA"):
if filter_records_by_type(all_records, "AAAA")[0]["content"] == ipv6_address:
print("AAAA record is up-to-date")
else:
print("AAAA record is outdated")
records_to_update.append(new_record(
fqdn, "AAAA", ipv6_address, 60))
else:
print("No AAAA record found")
records_to_create.append(new_record(
fqdn, "AAAA", ipv6_address, 60))
if (len(records_to_create) > 0):
post_new_records(zone["id"], records_to_create)
if (len(records_to_update) > 0):
patch_records(zone["id"], records_to_update)
def get_domain_from_fqdn(fqdn):
regex = r"(?:(?:\w|-)+\.)+(\w+\.\w+)$"
return re.search(regex, fqdn, re.IGNORECASE).group(1)
def get_ipv4_address():
return requests.request("GET", "https://api4.ipify.org").text
def get_ipv6_address(interface_name):
ip_output = subprocess.getoutput(f"ip -6 -o address show dev {interface_name} scope global | grep --invert temporary | grep --invert mngtmpaddr")
ip_output_regex = r"(?:inet6)(?:\s+)(.+)(?:\/\d{1,3})"
return re.search(ip_output_regex, ip_output, re.IGNORECASE).group(1)
def get_zone(domain):
response = json.loads(requests.request(
"GET", api_url, headers=api_headers).text)
return list(filter(lambda zone: zone['name'] == domain, response))[0]
def get_all_records_for_fqdn(zone_id, host):
url = f"{api_url}/{zone_id}"
records = json.loads(requests.request("GET", url, headers=api_headers).text)['records']
return list(filter(lambda record: record['name'] == host, records))
def filter_records_by_type(records, type):
return list(filter(lambda record: record['type'] == type, records))
def new_record(name, record_type, ip_address, ttl):
return {
"name": name,
"type": record_type,
"content": ip_address,
"ttl": ttl
}
def post_new_records(zone_id, records):
url = f"{api_url}/{zone_id}/records"
return requests.request("POST", url, headers=api_headers, json=records)
def patch_records(zone_id, records):
url = f"{api_url}/{zone_id}"
return requests.request("PATCH", url, headers=api_headers, json=records)
main()