230 lines
7.8 KiB
Python
230 lines
7.8 KiB
Python
import logging
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from typing import List, Optional
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import dns.query
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import dns.rdatatype
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import dns.resolver
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from django.db import IntegrityError
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from django.db.models.functions import Length
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from django_rq import job
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from dns import rcode
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from netaddr import ip
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from netbox_ddns.models import ACTION_CREATE, ACTION_DELETE, DNSStatus, ReverseZone, Zone
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from netbox_ddns.utils import normalize_fqdn
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logger = logging.getLogger('netbox_ddns')
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def get_zone(dns_name: str) -> Optional[Zone]:
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# Generate all possible zones
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zones = []
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parts = dns_name.lower().split('.')
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for i in range(len(parts)):
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zones.append('.'.join(parts[-i - 1:]))
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# Find the zone, if any
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return Zone.objects.filter(name__in=zones).order_by(Length('name').desc()).first()
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def get_soa(dns_name: str) -> str:
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parts = dns_name.rstrip('.').split('.')
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for i in range(len(parts)):
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zone_name = normalize_fqdn('.'.join(parts[i:]))
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try:
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dns.resolver.query(zone_name, dns.rdatatype.SOA)
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return zone_name
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except dns.resolver.NoAnswer:
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# The name exists, but has no SOA. Continue one level further up
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continue
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except dns.resolver.NXDOMAIN as e:
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# Look for a SOA record in the authority section
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for query, response in e.responses().items():
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for rrset in response.authority:
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if rrset.rdtype == dns.rdatatype.SOA:
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return rrset.name.to_text()
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def get_reverse_zone(address: ip.IPAddress) -> Optional[ReverseZone]:
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# Find the zone, if any
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zones = list(ReverseZone.objects.filter(prefix__net_contains=address))
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if not zones:
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return None
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zones.sort(key=lambda zone: zone.prefix.prefixlen)
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return zones[-1]
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def status_update(output: List[str], operation: str, response) -> None:
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code = response.rcode()
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if code == dns.rcode.NOERROR:
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message = f"{operation} successful"
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logger.info(message)
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else:
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message = f"{operation} failed: {dns.rcode.to_text(code)}"
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logger.error(message)
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output.append(message)
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def create_forward(dns_name: str, address: ip.IPAddress, status: Optional[DNSStatus], output: List[str]):
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zone = get_zone(dns_name)
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if zone:
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logger.debug(f"Found zone {zone.name} for {dns_name}")
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if status:
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status.forward_action = ACTION_CREATE
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# Check the SOA, we don't want to write to a parent zone if it has delegated authority
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soa = get_soa(dns_name)
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if soa == zone.name:
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record_type = 'A' if address.version == 4 else 'AAAA'
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update = zone.server.create_update(zone.name)
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update.add(
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dns_name,
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zone.ttl,
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record_type,
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str(address)
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)
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response = dns.query.udp(update, zone.server.address)
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status_update(output, f'Adding {dns_name} {record_type} {address}', response)
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if status:
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status.forward_rcode = response.rcode()
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else:
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logger.warning(f"Can't update zone {zone.name} for {dns_name}, "
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f"it has delegated authority for {soa}")
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if status:
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status.forward_rcode = rcode.NOTAUTH
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else:
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logger.debug(f"No zone found for {dns_name}")
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def delete_forward(dns_name: str, address: ip.IPAddress, status: Optional[DNSStatus], output: List[str]):
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zone = get_zone(dns_name)
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if zone:
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logger.debug(f"Found zone {zone.name} for {dns_name}")
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if status:
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status.forward_action = ACTION_DELETE
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# Check the SOA, we don't want to write to a parent zone if it has delegated authority
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soa = get_soa(dns_name)
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if soa == zone.name:
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record_type = 'A' if address.version == 4 else 'AAAA'
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update = zone.server.create_update(zone.name)
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update.delete(
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dns_name,
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record_type,
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str(address)
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)
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response = dns.query.udp(update, zone.server.address)
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status_update(output, f'Deleting {dns_name} {record_type} {address}', response)
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if status:
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status.forward_rcode = response.rcode()
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else:
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logger.warning(f"Can't update zone {zone.name} {dns_name}, "
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f"it has delegated authority for {soa}")
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if status:
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status.forward_rcode = rcode.NOTAUTH
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else:
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logger.debug(f"No zone found for {dns_name}")
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def create_reverse(dns_name: str, address: ip.IPAddress, status: Optional[DNSStatus], output: List[str]):
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zone = get_reverse_zone(address)
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if zone and dns_name:
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record_name = zone.record_name(address)
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logger.debug(f"Found zone {zone.name} for {record_name}")
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if status:
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status.reverse_action = ACTION_CREATE
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# Check the SOA, we don't want to write to a parent zone if it has delegated authority
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soa = get_soa(record_name)
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if soa == zone.name:
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update = zone.server.create_update(zone.name)
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update.add(
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record_name,
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zone.ttl,
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'ptr',
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dns_name
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)
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response = dns.query.udp(update, zone.server.address)
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status_update(output, f'Adding {record_name} PTR {dns_name}', response)
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if status:
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status.reverse_rcode = response.rcode()
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else:
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logger.warning(f"Can't update zone {zone.name} for {record_name}, "
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f"it has delegated authority for {soa}")
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if status:
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status.reverse_rcode = rcode.NOTAUTH
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else:
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logger.debug(f"No zone found for {address}")
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def delete_reverse(dns_name: str, address: ip.IPAddress, status: Optional[DNSStatus], output: List[str]):
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zone = get_reverse_zone(address)
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if zone and dns_name:
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record_name = zone.record_name(address)
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logger.debug(f"Found zone {zone.name} for {record_name}")
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if status:
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status.reverse_action = ACTION_DELETE
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# Check the SOA, we don't want to write to a parent zone if it has delegated authority
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soa = get_soa(record_name)
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if soa == zone.name:
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update = zone.server.create_update(zone.name)
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update.delete(
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record_name,
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'ptr',
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dns_name
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)
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response = dns.query.udp(update, zone.server.address)
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status_update(output, f'Deleting {record_name} PTR {dns_name}', response)
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if status:
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status.reverse_rcode = response.rcode()
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else:
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logger.warning(f"Can't update zone {zone.name} for {record_name}, "
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f"it has delegated authority for {soa}")
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if status:
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status.reverse_rcode = rcode.NOTAUTH
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else:
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logger.debug(f"No zone found for {address}")
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@job
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def dns_create(dns_name: str, address: ip.IPAddress, forward=True, reverse=True, status: DNSStatus = None):
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output = []
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if forward:
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create_forward(dns_name, address, status, output)
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if reverse:
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create_reverse(dns_name, address, status, output)
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if status:
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try:
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status.save()
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except IntegrityError:
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# Race condition when creating?
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status.save(force_update=True)
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return ', '.join(output)
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@job
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def dns_delete(dns_name: str, address: ip.IPAddress, forward=True, reverse=True, status: DNSStatus = None):
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output = []
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if forward:
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delete_forward(dns_name, address, status, output)
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if reverse:
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delete_reverse(dns_name, address, status, output)
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if status:
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try:
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status.save()
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except IntegrityError:
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# Race condition when creating?
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status.save(force_update=True)
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return ', '.join(output)
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