netbox-ddns/netbox_ddns/background_tasks.py

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import logging
from typing import List, Optional
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import dns.query
import dns.rdatatype
import dns.resolver
from django.db import IntegrityError
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from django_rq import job
from dns import rcode
from netaddr import ip
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from netbox_ddns.models import ACTION_CREATE, ACTION_DELETE, DNSStatus, ReverseZone, Zone
from netbox_ddns.utils import get_soa
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logger = logging.getLogger('netbox_ddns')
def status_update(output: List[str], operation: str, response) -> None:
code = response.rcode()
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if code == dns.rcode.NOERROR:
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message = f"{operation} successful"
logger.info(message)
else:
message = f"{operation} failed: {dns.rcode.to_text(code)}"
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logger.error(message)
output.append(message)
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def create_forward(dns_name: str, address: ip.IPAddress, status: Optional[DNSStatus], output: List[str]):
zone = Zone.objects.find_for_dns_name(dns_name)
if zone:
logger.debug(f"Found zone {zone.name} for {dns_name}")
if status:
status.forward_action = ACTION_CREATE
# Check the SOA, we don't want to write to a parent zone if it has delegated authority
soa = get_soa(dns_name)
if soa == zone.name:
record_type = 'A' if address.version == 4 else 'AAAA'
update = zone.server.create_update(zone.name)
update.add(
dns_name,
zone.ttl,
record_type,
str(address)
)
response = dns.query.udp(update, zone.server.address)
status_update(output, f'Adding {dns_name} {record_type} {address}', response)
if status:
status.forward_rcode = response.rcode()
else:
logger.warning(f"Can't update zone {zone.name} for {dns_name}, "
f"it has delegated authority for {soa}")
if status:
status.forward_rcode = rcode.NOTAUTH
else:
logger.debug(f"No zone found for {dns_name}")
def delete_forward(dns_name: str, address: ip.IPAddress, status: Optional[DNSStatus], output: List[str]):
zone = Zone.objects.find_for_dns_name(dns_name)
if zone:
logger.debug(f"Found zone {zone.name} for {dns_name}")
if status:
status.forward_action = ACTION_DELETE
# Check the SOA, we don't want to write to a parent zone if it has delegated authority
soa = get_soa(dns_name)
if soa == zone.name:
record_type = 'A' if address.version == 4 else 'AAAA'
update = zone.server.create_update(zone.name)
update.delete(
dns_name,
record_type,
str(address)
)
response = dns.query.udp(update, zone.server.address)
status_update(output, f'Deleting {dns_name} {record_type} {address}', response)
if status:
status.forward_rcode = response.rcode()
else:
logger.warning(f"Can't update zone {zone.name} {dns_name}, "
f"it has delegated authority for {soa}")
if status:
status.forward_rcode = rcode.NOTAUTH
else:
logger.debug(f"No zone found for {dns_name}")
def create_reverse(dns_name: str, address: ip.IPAddress, status: Optional[DNSStatus], output: List[str]):
zone = ReverseZone.objects.find_for_address(address)
if zone and dns_name:
record_name = zone.record_name(address)
logger.debug(f"Found zone {zone.name} for {record_name}")
if status:
status.reverse_action = ACTION_CREATE
# 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,
zone.ttl,
'ptr',
dns_name
)
response = dns.query.udp(update, zone.server.address)
status_update(output, f'Adding {record_name} PTR {dns_name}', response)
if status:
status.reverse_rcode = response.rcode()
else:
logger.warning(f"Can't update zone {zone.name} for {record_name}, "
f"it has delegated authority for {soa}")
if status:
status.reverse_rcode = rcode.NOTAUTH
else:
logger.debug(f"No zone found for {address}")
def delete_reverse(dns_name: str, address: ip.IPAddress, status: Optional[DNSStatus], output: List[str]):
zone = ReverseZone.objects.find_for_address(address)
if zone and dns_name:
record_name = zone.record_name(address)
logger.debug(f"Found zone {zone.name} for {record_name}")
if status:
status.reverse_action = ACTION_DELETE
# 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',
dns_name
)
response = dns.query.udp(update, zone.server.address)
status_update(output, f'Deleting {record_name} PTR {dns_name}', response)
if status:
status.reverse_rcode = response.rcode()
else:
logger.warning(f"Can't update zone {zone.name} for {record_name}, "
f"it has delegated authority for {soa}")
if status:
status.reverse_rcode = rcode.NOTAUTH
else:
logger.debug(f"No zone found for {address}")
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@job
def dns_create(dns_name: str, address: ip.IPAddress, forward=True, reverse=True, status: DNSStatus = None):
output = []
if forward:
create_forward(dns_name, address, status, output)
if reverse:
create_reverse(dns_name, address, status, output)
if status:
try:
status.save()
except IntegrityError:
# Race condition when creating?
status.save(force_update=True)
return ', '.join(output)
@job
def dns_delete(dns_name: str, address: ip.IPAddress, forward=True, reverse=True, status: DNSStatus = None):
output = []
if forward:
delete_forward(dns_name, address, status, output)
if reverse:
delete_reverse(dns_name, address, status, output)
if status:
try:
status.save()
except IntegrityError:
# Race condition when creating?
status.save(force_update=True)
return ', '.join(output)