Sven Luethi
73544a4335
modified: netbox_dns_bridge/notify_handler.py modified: netbox_dns_bridge/request_handler.py modified: netbox_dns_bridge/signals/netbox_dns_zones.py Disable NOTIFY feature by default and add setting to enable it.
83 lines
2.8 KiB
Python
83 lines
2.8 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.tsig
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from django.conf import settings
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from django.utils import timezone
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from netbox.jobs import JobRunner
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from netbox_dns.models import View, Zone
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from .logger import get_logger
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from .models import SeenTransferClients
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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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view_name = kwargs["view_name"]
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zone_name = kwargs["zone_name"]
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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_dead_after_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 name in (zone_name, "catz", f"{view_name}.catz"):
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msg = dns.message.make_query(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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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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dns.query.udp(msg, client.source_ip, timeout=2)
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self.logger.info(
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f"NOTIFY sent to {client.source_ip} for zone {name}"
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)
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except Exception as e:
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self.logger.error(
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f"NOTIFY failed for {client.source_ip} zone {name}: {e}"
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)
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def schedule(zone: Zone):
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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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)
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