nixfiles/nixos/boxes/home/routing-common/dns_update.py

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#!/usr/bin/env python3
import argparse
import subprocess
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import cloudflare
def main():
parser = argparse.ArgumentParser(description='Cloudflare DNS update script')
parser.add_argument('-k', '--api-token-file', help='Cloudflare API token file')
parser.add_argument('zone', help='Cloudflare Zone')
parser.add_argument('record', help='Cloudflare record name')
args = parser.parse_args()
address = subprocess.check_output(
['drill', '-Q', '-p5353', '@127.0.0.1', args.record, 'A'],
encoding='utf8').strip()
cf_token = None
if args.api_token_file:
with open(args.api_token_file) as f:
cf_token = f.readline().strip()
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cf = cloudflare.Cloudflare(api_token=cf_token)
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zones = list(cf.zones.list(name=args.zone))
assert zones, f'Zone {args.zone} not found'
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assert len(zones) == 1, f'More than one zone found for {args.zone}'
zone = zones[0]
records = list(cf.dns.records.list(zone_id=zone.id, name=args.record, type='A'))
assert records, f'Record {args.record} not found in zone {args.zone}'
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assert len(records) == 1, f'More than one record found for {args.record}'
record = records[0]
print(f'Updating {args.record} -> {address}')
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cf.dns.records.edit(
zone_id=zone.id, dns_record_id=record.id,
type='A', content=address)
if __name__ == '__main__':
main()