2023-09-23 14:42:00 +00:00
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#!/usr/bin/env python3
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import logging
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from ipaddress import ip_address
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from json import loads
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from subprocess import check_output, run
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DOMAIN = '${domain}'
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# <%text>
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logging.basicConfig(level=logging.INFO)
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LOG = logging.getLogger('DynDNS checker')
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try:
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iproute = loads(check_output(['ip', '-json', 'address', 'show', 'scope', 'global']))
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resolved_ipv4 = check_output(['dig', '+short', DOMAIN, 'A']).decode().strip()
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resolved_ipv6 = check_output(['dig', '+short', DOMAIN, 'AAAA']).decode().strip()
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LOG.info(f'resolved ipv4 is "{resolved_ipv4}"')
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LOG.info(f'resolved ipv6 is "{resolved_ipv6}"')
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needs_changing = False
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for iface in iproute:
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if not iface['ifname'].startswith('ppp'):
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LOG.debug(f'ignoring {iface["ifname"]}')
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continue
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LOG.info(f'working on {iface["ifname"]}')
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for ip in iface['addr_info']:
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try:
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addr = ip_address(ip['local'])
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LOG.info(f'{iface["ifname"]} has ip {addr.compressed}')
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if (
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(addr.version == 4 and addr.compressed != resolved_ipv4)
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or (addr.version == 6 and addr.compressed != resolved_ipv6)
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):
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needs_changing = True
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except Exception:
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continue
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if needs_changing:
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LOG.warning('addresses have changed, calling update script!')
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run(['/etc/ppp/ip-up.d/dyndns'])
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else:
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LOG.info('everything is fine')
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except Exception as e:
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logging.exception(e)
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# </%text>
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