176 lines
6.9 KiB
Python
176 lines
6.9 KiB
Python
|
import logging
|
||
|
|
from typing import Optional
|
||
|
|
|
||
|
|
import dns.query
|
||
|
|
import dns.rdatatype
|
||
|
|
import dns.resolver
|
||
|
|
from django.db.models.functions import Length
|
||
|
|
from django_rq import job
|
||
|
|
from netaddr.ip import IPAddress
|
||
|
|
|
||
|
|
from netbox_ddns.models import ReverseZone, Zone
|
||
|
|
|
||
|
|
logger = logging.getLogger('netbox_ddns')
|
||
|
|
|
||
|
|
|
||
|
|
def get_zone(dns_name: str) -> Optional[Zone]:
|
||
|
|
# Generate all possible zones
|
||
|
|
zones = []
|
||
|
|
parts = dns_name.lower().split('.')
|
||
|
|
for i in range(len(parts)):
|
||
|
|
zones.append('.'.join(parts[-i - 1:]))
|
||
|
|
|
||
|
|
# Find the zone, if any
|
||
|
|
return Zone.objects.filter(name__in=zones).order_by(Length('name').desc()).first()
|
||
|
|
|
||
|
|
|
||
|
|
def get_soa(dns_name: str) -> str:
|
||
|
|
parts = dns_name.rstrip('.').split('.')
|
||
|
|
for i in range(len(parts)):
|
||
|
|
zone_name = '.'.join(parts[i:])
|
||
|
|
|
||
|
|
try:
|
||
|
|
dns.resolver.query(zone_name + '.', dns.rdatatype.SOA)
|
||
|
|
return zone_name
|
||
|
|
except dns.resolver.NoAnswer:
|
||
|
|
# The name exists, but has no SOA. Continue one level further up
|
||
|
|
continue
|
||
|
|
except dns.resolver.NXDOMAIN as e:
|
||
|
|
# Look for a SOA record in the authority section
|
||
|
|
for query, response in e.responses().items():
|
||
|
|
for rrset in response.authority:
|
||
|
|
if rrset.rdtype == dns.rdatatype.SOA:
|
||
|
|
return rrset.name.to_text(omit_final_dot=True)
|
||
|
|
|
||
|
|
|
||
|
|
def get_reverse_zone(address: IPAddress) -> Optional[ReverseZone]:
|
||
|
|
# Find the zone, if any
|
||
|
|
zones = list(ReverseZone.objects.filter(prefix__net_contains=address))
|
||
|
|
if not zones:
|
||
|
|
return None
|
||
|
|
|
||
|
|
zones.sort(key=lambda zone: zone.prefix.prefixlen)
|
||
|
|
return zones[-1]
|
||
|
|
|
||
|
|
|
||
|
|
def update_status(status: list, operation: str, response) -> None:
|
||
|
|
rcode = response.rcode()
|
||
|
|
|
||
|
|
if rcode == dns.rcode.NOERROR:
|
||
|
|
message = f"{operation} successful"
|
||
|
|
logger.info(message)
|
||
|
|
else:
|
||
|
|
message = f"{operation} failed: {dns.rcode.to_text(rcode)}"
|
||
|
|
logger.error(message)
|
||
|
|
|
||
|
|
status.append(message)
|
||
|
|
|
||
|
|
|
||
|
|
@job
|
||
|
|
def update_dns(old_address: IPAddress = None, new_address: IPAddress = None,
|
||
|
|
old_dns_name: str = '', new_dns_name: str = '',
|
||
|
|
skip_forward=False, skip_reverse=False):
|
||
|
|
status = []
|
||
|
|
|
||
|
|
# Only delete old records when they are provided and not the same as the new records
|
||
|
|
if old_dns_name and old_address and (old_dns_name != new_dns_name or old_address != new_address):
|
||
|
|
# Delete old forward record
|
||
|
|
if not skip_forward:
|
||
|
|
zone = get_zone(old_dns_name)
|
||
|
|
if zone:
|
||
|
|
logger.debug(f"Found zone {zone.name} for {old_dns_name}")
|
||
|
|
|
||
|
|
# Check the SOA, we don't want to write to a parent zone if it has delegated authority
|
||
|
|
soa = get_soa(old_dns_name)
|
||
|
|
if soa == zone.name:
|
||
|
|
update = zone.server.create_update(zone.name)
|
||
|
|
update.delete(
|
||
|
|
old_dns_name + '.',
|
||
|
|
'a' if old_address.version == 4 else 'aaaa',
|
||
|
|
str(old_address)
|
||
|
|
)
|
||
|
|
response = dns.query.udp(update, zone.server.address)
|
||
|
|
update_status(status, f'Deleting {old_dns_name} {old_address}', response)
|
||
|
|
else:
|
||
|
|
logger.debug(f"Can't update zone {zone.name} for {old_dns_name}, "
|
||
|
|
f"it has delegated authority for {soa}")
|
||
|
|
else:
|
||
|
|
logger.debug(f"No zone found for {old_dns_name}")
|
||
|
|
|
||
|
|
# Delete old reverse record
|
||
|
|
if not skip_reverse:
|
||
|
|
zone = get_reverse_zone(old_address)
|
||
|
|
if zone:
|
||
|
|
record_name = zone.record_name(old_address)
|
||
|
|
logger.debug(f"Found zone {zone.name} for {record_name}")
|
||
|
|
|
||
|
|
# Check the SOA, we don't want to write to a parent zone if it has delegated authority
|
||
|
|
soa = get_soa(record_name)
|
||
|
|
if soa == zone.name:
|
||
|
|
update = zone.server.create_update(zone.name)
|
||
|
|
update.delete(
|
||
|
|
record_name + '.',
|
||
|
|
'ptr',
|
||
|
|
old_dns_name + '.'
|
||
|
|
)
|
||
|
|
response = dns.query.udp(update, zone.server.address)
|
||
|
|
update_status(status, f'Deleting {record_name} {old_dns_name}', response)
|
||
|
|
else:
|
||
|
|
logger.debug(f"Can't update zone {zone.name} for {record_name}, "
|
||
|
|
f"it has delegated authority for {soa}")
|
||
|
|
else:
|
||
|
|
logger.debug(f"No zone found for {old_address}")
|
||
|
|
|
||
|
|
# Always try to add, just in case a previous update failed
|
||
|
|
if new_dns_name and new_address:
|
||
|
|
# Add new forward record
|
||
|
|
if not skip_forward:
|
||
|
|
zone = get_zone(new_dns_name)
|
||
|
|
if zone:
|
||
|
|
logger.debug(f"Found zone {zone.name} for {new_dns_name}")
|
||
|
|
|
||
|
|
# Check the SOA, we don't want to write to a parent zone if it has delegated authority
|
||
|
|
soa = get_soa(new_dns_name)
|
||
|
|
if soa == zone.name:
|
||
|
|
update = zone.server.create_update(zone.name)
|
||
|
|
update.add(
|
||
|
|
new_dns_name + '.',
|
||
|
|
300,
|
||
|
|
'a' if new_address.version == 4 else 'aaaa',
|
||
|
|
str(new_address)
|
||
|
|
)
|
||
|
|
response = dns.query.udp(update, zone.server.address)
|
||
|
|
update_status(status, f'Adding {new_dns_name} {new_address}', response)
|
||
|
|
else:
|
||
|
|
logger.debug(f"Can't update zone {zone.name} for {old_dns_name}, "
|
||
|
|
f"it has delegated authority for {soa}")
|
||
|
|
else:
|
||
|
|
logger.debug(f"No zone found for {new_dns_name}")
|
||
|
|
|
||
|
|
# Add new reverse record
|
||
|
|
if not skip_reverse:
|
||
|
|
zone = get_reverse_zone(new_address)
|
||
|
|
if zone:
|
||
|
|
record_name = zone.record_name(new_address)
|
||
|
|
logger.debug(f"Found zone {zone.name} for {record_name}")
|
||
|
|
|
||
|
|
# Check the SOA, we don't want to write to a parent zone if it has delegated authority
|
||
|
|
soa = get_soa(record_name)
|
||
|
|
if soa == zone.name:
|
||
|
|
update = zone.server.create_update(zone.name)
|
||
|
|
update.add(
|
||
|
|
record_name + '.',
|
||
|
|
300,
|
||
|
|
'ptr',
|
||
|
|
new_dns_name + '.'
|
||
|
|
)
|
||
|
|
response = dns.query.udp(update, zone.server.address)
|
||
|
|
update_status(status, f'Adding {record_name} {old_dns_name}', response)
|
||
|
|
else:
|
||
|
|
logger.debug(f"Can't update zone {zone.name} for {record_name}, "
|
||
|
|
f"it has delegated authority for {soa}")
|
||
|
|
else:
|
||
|
|
logger.debug(f"No zone found for {new_address}")
|
||
|
|
|
||
|
|
return ', '.join(status)
|