Sven Luethi
f5791e94d5
modified: __init__.py modified: catalog_zone_manager.py modified: dns_server.py modified: notify_handler.py Adding serial to notify messages to allow client to determine state.
141 lines
4.9 KiB
Python
141 lines
4.9 KiB
Python
import dns.message
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import dns.name
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import dns.opcode
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import dns.query
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import dns.rdatatype
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import dns.rdataclass
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import dns.rrset
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import dns.tsig
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from django.conf import settings
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from django.utils import timezone
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from django.db import close_old_connections, OperationalError
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from netbox.jobs import JobRunner
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from netbox_dns.models import View, Zone, Record
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from .logger import get_logger
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from .models import SeenTransferClients, IntegerKeyValueSetting
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LOGGER = get_logger(__name__)
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SETTINGS = settings.PLUGINS_CONFIG["netbox_dns_bridge"]
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class SendDNSNotify(JobRunner):
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class Meta:
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name = "Send DNS NOTIFY"
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def _load_tsig_key(self, view_name: str) -> dns.tsig.Key:
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tsig_keys = SETTINGS.get("tsig_keys", {})
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if view_name not in tsig_keys:
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raise RuntimeError(f"No TSIG key configured for view '{view_name}'")
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key_data = tsig_keys[view_name]
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raw_key_name = key_data.get("keyname")
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secret = key_data.get("secret")
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algorithm = key_data.get("algorithm")
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if not algorithm:
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raise RuntimeError(
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f"Missing 'algorithm' in TSIG key configuration for view '{view_name}'"
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)
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if not raw_key_name or not secret:
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raise RuntimeError(
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f"Incomplete TSIG key configuration for view '{view_name}'"
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)
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key_name = dns.name.from_text(raw_key_name, origin=None).canonicalize()
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if not key_name.is_absolute():
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key_name = key_name.concatenate(dns.name.root)
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return dns.tsig.Key(name=key_name, secret=secret, algorithm=algorithm)
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def run(self, *args, **kwargs):
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notify_over_tcp = SETTINGS.get("notify_over_tcp", False)
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view_name = kwargs["view_name"]
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try:
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catz_serial = IntegerKeyValueSetting.objects.get(key="catalog-zone-soa-serial").value
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zones = [
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(kwargs["zone_name"], kwargs["soa_serial"]),
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("catz", catz_serial),
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(f"{view_name}.catz", catz_serial)
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]
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view = View.objects.get(name=view_name)
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tsig_key = self._load_tsig_key(view_name)
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cutoff_hours = SETTINGS.get("notify_client_alive_threshold_hours", 24)
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seen_cutoff = timezone.now() - timezone.timedelta(hours=cutoff_hours)
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clients = SeenTransferClients.objects.filter(
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view=view, last_seen__gte=seen_cutoff
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)
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for zone_name, soa_serial in zones:
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msg = dns.message.make_query(zone_name, dns.rdatatype.SOA)
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msg.flags = 0
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msg.set_opcode(dns.opcode.NOTIFY)
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soa_rdata = dns.rdata.from_text(
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dns.rdataclass.IN,
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dns.rdatatype.SOA,
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f"invalid invalid {soa_serial} 60 10 1209600 0",
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)
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soa_rrset = dns.rrset.from_rdata(
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dns.name.from_text(zone_name, dns.name.root), 0, soa_rdata
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)
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msg.authority.append(soa_rrset)
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msg.use_tsig(keyring={tsig_key.name: tsig_key}, keyname=tsig_key.name)
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for client in clients:
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try:
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if notify_over_tcp:
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LOGGER.info("Sending over TCP")
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dns.query.tcp(msg, client.source_ip, timeout=2)
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else:
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LOGGER.info("Sending over UDP")
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dns.query.udp(msg, client.source_ip, timeout=2)
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LOGGER.info(
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f"NOTIFY sent to {client.source_ip} for zone {zone_name}"
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)
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except Exception as e:
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LOGGER.error(
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f"NOTIFY failed for {client.source_ip} zone {zone_name}: {e}"
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)
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except IntegerKeyValueSetting.DoesNotExist as e:
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LOGGER.error(f"Failed to get catalog zone serial: {e}")
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except OperationalError as e:
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LOGGER.error(f"NOTIFY failed due to unexpected error: {e}")
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close_old_connections()
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def schedule(zone: Zone):
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try:
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soa_record = Record.objects.filter(
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zone=zone, type="SOA", active=True
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).first()
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if soa_record is None:
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LOGGER.error(
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f"Zone {zone.name} has no active SOA record — skipping NOTIFY"
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)
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return
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soa_serial = int(soa_record.value.split()[2])
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except OperationalError as e:
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LOGGER.error(f"DB ERROR while fetching SOA for zone {zone.name}: {e}")
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close_old_connections()
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return
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except (ValueError, IndexError) as e:
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LOGGER.error(
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f"Failed to parse SOA serial for zone {zone.name}: {e}"
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)
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return
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SendDNSNotify.enqueue(
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zone_name=zone.name,
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view_name=zone.view.name,
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soa_serial=soa_serial,
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)
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