modified: netbox_dns_bridge/__init__.py
deleted: netbox_dns_bridge/logger.py modified: netbox_dns_bridge/management/commands/dns-transfer-endpoint.py new file: netbox_dns_bridge/management/commands/dns_transfer_endpoint/__init__.py renamed: netbox_dns_bridge/catalog_zone_manager.py -> netbox_dns_bridge/management/commands/dns_transfer_endpoint/catalog_zone_manager.py renamed: netbox_dns_bridge/dns_server.py -> netbox_dns_bridge/management/commands/dns_transfer_endpoint/dns_server.py renamed: netbox_dns_bridge/request_handler.py -> netbox_dns_bridge/management/commands/dns_transfer_endpoint/request_handler.py modified: netbox_dns_bridge/signals/netbox_dns_zones.py renamed: netbox_dns_bridge/notify_handler.py -> netbox_dns_bridge/signals/notify_handler.py modified: netbox_dns_bridge/utils.py
This commit is contained in:
Sven Luethi authored and Sven Luthi committed
1 parent
0ac23ff3a0
commit
ac34afc46c
10 files changed
+25
-37
No files matched your search
@@ -0,0 +1,262 @@
|
||||
import dns.message
|
||||
import dns.name
|
||||
import dns.opcode
|
||||
import dns.query
|
||||
import dns.rdatatype
|
||||
import dns.rdataclass
|
||||
import dns.rrset
|
||||
import dns.tsig
|
||||
from django.conf import settings
|
||||
from django.utils import timezone
|
||||
from django.db import close_old_connections, OperationalError
|
||||
from netbox.jobs import JobRunner
|
||||
from netbox_dns.models import View, Zone, Record
|
||||
from netbox_dns_bridge.utils import get_logger
|
||||
from netbox_dns_bridge.models import SeenTransferClients, IntegerKeyValueSetting
|
||||
|
||||
LOGGER = get_logger(__name__)
|
||||
SETTINGS = settings.PLUGINS_CONFIG.get("netbox_dns_bridge", {})
|
||||
|
||||
def _load_tsig_key(view_name: str) -> dns.tsig.Key:
|
||||
tsig_keys = SETTINGS.get("tsig_keys", {})
|
||||
if view_name not in tsig_keys:
|
||||
raise RuntimeError(f"No TSIG key configured for view '{view_name}'")
|
||||
|
||||
key_data = tsig_keys[view_name]
|
||||
raw_key_name = key_data.get("keyname")
|
||||
secret = key_data.get("secret")
|
||||
algorithm = key_data.get("algorithm")
|
||||
if not algorithm:
|
||||
raise RuntimeError(
|
||||
f"Missing 'algorithm' in TSIG key configuration for view '{view_name}'"
|
||||
)
|
||||
|
||||
if not raw_key_name or not secret:
|
||||
raise RuntimeError(f"Incomplete TSIG key configuration for view '{view_name}'")
|
||||
|
||||
key_name = dns.name.from_text(raw_key_name, origin=None).canonicalize()
|
||||
if not key_name.is_absolute():
|
||||
key_name = key_name.concatenate(dns.name.root)
|
||||
|
||||
return dns.tsig.Key(name=key_name, secret=secret, algorithm=algorithm)
|
||||
|
||||
|
||||
class SendClientDNSNotify(JobRunner):
|
||||
class Meta:
|
||||
name = "Send DNS NOTIFY"
|
||||
|
||||
def run(self, *args, **kwargs):
|
||||
notify_over_tcp = SETTINGS.get("notify_over_tcp", False)
|
||||
port = SETTINGS.get("notify_client_port", 53)
|
||||
view_name = kwargs["view_name"]
|
||||
|
||||
try:
|
||||
catz_serial = IntegerKeyValueSetting.objects.get(
|
||||
key="catalog-zone-soa-serial"
|
||||
).value
|
||||
|
||||
zones = [
|
||||
(kwargs["zone_name"], kwargs["soa_serial"]),
|
||||
("catz", catz_serial),
|
||||
(f"{view_name}.catz", catz_serial),
|
||||
]
|
||||
|
||||
view = View.objects.get(name=view_name)
|
||||
tsig_key = _load_tsig_key(view_name)
|
||||
cutoff_hours = SETTINGS.get("notify_client_alive_threshold_hours", 24)
|
||||
seen_cutoff = timezone.now() - timezone.timedelta(hours=cutoff_hours)
|
||||
|
||||
clients = SeenTransferClients.objects.filter(
|
||||
view=view, last_seen__gte=seen_cutoff
|
||||
)
|
||||
|
||||
for zone_name, soa_serial in zones:
|
||||
zone_name = dns.name.from_text(zone_name, dns.name.root).to_text()
|
||||
msg = dns.message.make_query(zone_name, dns.rdatatype.SOA)
|
||||
msg.flags |= dns.flags.AA # = 0
|
||||
msg.set_opcode(dns.opcode.NOTIFY)
|
||||
|
||||
soa_rdata = dns.rdata.from_text(
|
||||
dns.rdataclass.IN,
|
||||
dns.rdatatype.SOA,
|
||||
f"invalid. invalid. {soa_serial} 60 10 1209600 0",
|
||||
)
|
||||
soa_rrset = dns.rrset.from_rdata(zone_name, 0, soa_rdata)
|
||||
msg.answer.append(soa_rrset)
|
||||
msg.use_tsig(keyring={tsig_key.name: tsig_key}, keyname=tsig_key.name)
|
||||
|
||||
for client in clients:
|
||||
try:
|
||||
if notify_over_tcp:
|
||||
LOGGER.debug("Sending NOTIFY over TCP")
|
||||
dns.query.tcp(msg, client.source_ip, port=port, timeout=2)
|
||||
else:
|
||||
LOGGER.debug("Sending NOTIFY over UDP")
|
||||
dns.query.udp(msg, client.source_ip, port=port, timeout=2)
|
||||
|
||||
LOGGER.info(
|
||||
f"NOTIFY sent: {client.source_ip} {view_name}/{zone_name} {soa_serial}"
|
||||
)
|
||||
except Exception as e:
|
||||
LOGGER.error(
|
||||
f"NOTIFY failed: {client.source_ip}:{port}"
|
||||
f" {view_name}/{zone_name} {soa_serial}: {e}"
|
||||
)
|
||||
|
||||
except IntegerKeyValueSetting.DoesNotExist as e:
|
||||
LOGGER.error(f"Failed to get catalog zone serial: {e}")
|
||||
|
||||
except OperationalError as e:
|
||||
LOGGER.error(f"NOTIFY failed due to unexpected error: {e}")
|
||||
close_old_connections()
|
||||
|
||||
|
||||
class SendNSNotify(JobRunner):
|
||||
"""Send a NOTIFY straight to a zone's own nameservers.
|
||||
|
||||
Unlike ``SendClientDNSNotify`` (which notifies clients that previously queried the
|
||||
transfer endpoint), this job resolves the addresses of the zone's configured
|
||||
nameservers from NetBox DNS itself and notifies each of them so they pick up
|
||||
the changed zone quickly.
|
||||
"""
|
||||
|
||||
class Meta:
|
||||
name = "Send DNS NOTIFY to zone nameservers"
|
||||
|
||||
def run(self, *args, **kwargs):
|
||||
notify_over_tcp = SETTINGS.get("notify_over_tcp", False)
|
||||
port = SETTINGS.get("notify_ns_port", 53)
|
||||
view_name = kwargs["view_name"]
|
||||
zone_name = kwargs["zone_name"]
|
||||
soa_serial = kwargs["soa_serial"]
|
||||
|
||||
try:
|
||||
zone = Zone.objects.get(pk=kwargs["zone_id"])
|
||||
except Zone.DoesNotExist:
|
||||
LOGGER.error(f"NS NOTIFY: zone id {kwargs['zone_id']} no longer exists")
|
||||
return
|
||||
except OperationalError as e:
|
||||
LOGGER.error(f"NS NOTIFY failed due to unexpected error: {e}")
|
||||
close_old_connections()
|
||||
return
|
||||
|
||||
ns_targets = _resolve_zone_nameserver_ips(zone)
|
||||
if not ns_targets:
|
||||
LOGGER.warning(
|
||||
f"NS NOTIFY: no nameserver addresses found in NetBox DNS for "
|
||||
f"{view_name}/{zone_name} — skipping"
|
||||
)
|
||||
return
|
||||
|
||||
try:
|
||||
tsig_key = _load_tsig_key(view_name)
|
||||
except RuntimeError as e:
|
||||
LOGGER.error(f"NS NOTIFY aborted for {view_name}/{zone_name}: {e}")
|
||||
return
|
||||
|
||||
fqdn = dns.name.from_text(zone_name, dns.name.root).to_text()
|
||||
msg = dns.message.make_query(fqdn, dns.rdatatype.SOA)
|
||||
msg.flags |= dns.flags.AA
|
||||
msg.set_opcode(dns.opcode.NOTIFY)
|
||||
|
||||
soa_rdata = dns.rdata.from_text(
|
||||
dns.rdataclass.IN,
|
||||
dns.rdatatype.SOA,
|
||||
f"invalid. invalid. {soa_serial} 60 10 1209600 0",
|
||||
)
|
||||
msg.answer.append(dns.rrset.from_rdata(fqdn, 0, soa_rdata))
|
||||
msg.use_tsig(keyring={tsig_key.name: tsig_key}, keyname=tsig_key.name)
|
||||
|
||||
for ip in ns_targets:
|
||||
try:
|
||||
if notify_over_tcp:
|
||||
LOGGER.debug("Sending NS NOTIFY over TCP")
|
||||
dns.query.tcp(msg, ip, port=port, timeout=2)
|
||||
else:
|
||||
LOGGER.debug("Sending NS NOTIFY over UDP")
|
||||
dns.query.udp(msg, ip, port=port, timeout=2)
|
||||
|
||||
LOGGER.info(f"NS NOTIFY sent: {ip} {view_name}/{fqdn} {soa_serial}")
|
||||
except Exception as e:
|
||||
LOGGER.error(
|
||||
f"NS NOTIFY failed: {ip} {view_name}/{fqdn} {soa_serial}: {e}"
|
||||
)
|
||||
|
||||
|
||||
def _get_soa_serial(zone: Zone):
|
||||
"""Return the current SOA serial of a zone parsed from its SOA record."""
|
||||
try:
|
||||
soa_record = Record.objects.filter(zone=zone, type="SOA", active=True).first()
|
||||
if soa_record is None:
|
||||
LOGGER.error(f"Zone {zone.name} has no active SOA record — skipping NOTIFY")
|
||||
return None
|
||||
|
||||
return int(soa_record.value.split()[2])
|
||||
|
||||
except OperationalError as e:
|
||||
LOGGER.error(f"DB ERROR while fetching SOA for zone {zone.name}: {e}")
|
||||
close_old_connections()
|
||||
return None
|
||||
except (ValueError, IndexError) as e:
|
||||
LOGGER.error(f"Failed to parse SOA serial for zone {zone.name}: {e}")
|
||||
return None
|
||||
|
||||
|
||||
def _resolve_zone_nameserver_ips(zone: Zone) -> list:
|
||||
"""Resolve the zone's nameserver hostnames to IPs using NetBox DNS records.
|
||||
|
||||
For each nameserver assigned to the zone, matching active A/AAAA records
|
||||
within the same view are looked up in NetBox DNS. Returns a de-duplicated,
|
||||
order-preserving list of IP addresses.
|
||||
"""
|
||||
ips = []
|
||||
try:
|
||||
nameservers = list(zone.nameservers.all())
|
||||
view = zone.view
|
||||
|
||||
for nameserver in nameservers:
|
||||
fqdn = dns.name.from_text(nameserver.name, dns.name.root).to_text()
|
||||
# Match both with and without a trailing dot to be resilient against
|
||||
# how the fqdn is stored on the Record model.
|
||||
candidates = {fqdn, fqdn.rstrip(".")}
|
||||
|
||||
records = Record.objects.filter(
|
||||
fqdn__in=list(candidates),
|
||||
type__in=["A", "AAAA"],
|
||||
active=True,
|
||||
zone__view=view,
|
||||
)
|
||||
for record in records:
|
||||
if record.value not in ips:
|
||||
ips.append(record.value)
|
||||
|
||||
except OperationalError as e:
|
||||
LOGGER.error(f"DB ERROR while resolving nameservers for {zone.name}: {e}")
|
||||
close_old_connections()
|
||||
|
||||
return ips
|
||||
|
||||
|
||||
def schedule_client_notify(zone: Zone):
|
||||
soa_serial = _get_soa_serial(zone)
|
||||
if soa_serial is None:
|
||||
return
|
||||
|
||||
SendClientDNSNotify.enqueue(
|
||||
zone_name=zone.name,
|
||||
view_name=zone.view.name,
|
||||
soa_serial=soa_serial,
|
||||
)
|
||||
|
||||
|
||||
def schedule_ns_notify(zone: Zone):
|
||||
soa_serial = _get_soa_serial(zone)
|
||||
if soa_serial is None:
|
||||
return
|
||||
|
||||
SendNSNotify.enqueue(
|
||||
zone_id=zone.pk,
|
||||
zone_name=zone.name,
|
||||
view_name=zone.view.name,
|
||||
soa_serial=soa_serial,
|
||||
)
|
||||
Reference in new issue
Block a user