Major restructure and add support for extra DNS names

.idea/netbox_ddns.iml

@@ -23,10 +23,5 @@
   </component>
   <component name="TemplatesService">
     <option name="TEMPLATE_CONFIGURATION" value="Django" />
-    <option name="TEMPLATE_FOLDERS">
-      <list>
-        <option value="$MODULE_DIR$/netbox_ddns/templates" />
-      </list>
-    </option>
   </component>
 </module>

netbox_ddns/admin.py

@@ -10,8 +10,10 @@ from django.utils.translation import gettext_lazy as _
 
 from ipam.models import IPAddress
 from netbox.admin import admin_site
-from .background_tasks import update_dns
+from netbox_ddns.models import DNSStatus, ExtraDNSName
+from .background_tasks import dns_create
 from .models import ReverseZone, Server, Zone
+from .utils import normalize_fqdn
 
 logger = logging.getLogger('netbox_ddns')
 
@@ -65,18 +67,44 @@ class ZoneAdmin(admin.ModelAdmin):
             more_specifics = Zone.objects.filter(name__endswith=zone.name).exclude(pk=zone.pk)
 
             # Find all IPAddress objects in this zone but not in the more-specifics
-            addresses = IPAddress.objects.filter(Q(dns_name__endswith=zone.name) |
+            ip_addresses = IPAddress.objects.filter(Q(dns_name__endswith=zone.name) |
                                                     Q(dns_name__endswith=zone.name.rstrip('.')))
             for more_specific in more_specifics:
-                addresses = addresses.exclude(Q(dns_name__endswith=more_specific.name) |
+                ip_addresses = ip_addresses.exclude(Q(dns_name__endswith=more_specific.name) |
                                                     Q(dns_name__endswith=more_specific.name.rstrip('.')))
 
-            for address in addresses:
+            for ip_address in ip_addresses:
-                if address.dns_name:
+                new_address = ip_address.address.ip
-                    update_dns.delay(
+                new_dns_name = normalize_fqdn(ip_address.dns_name)
-                        new_record=address,
+
-                        skip_reverse=True
+                if new_dns_name:
+                    status, created = DNSStatus.objects.get_or_create(ip_address=ip_address)
+
+                    dns_create.delay(
+                        dns_name=new_dns_name,
+                        address=new_address,
+                        status=status,
+                        reverse=False,
                     )
+
+                    counter += 1
+
+            # Find all ExtraDNSName objects in this zone but not in the more-specifics
+            extra_names = ExtraDNSName.objects.filter(name__endswith=zone.name)
+            for more_specific in more_specifics:
+                extra_names = extra_names.exclude(name__endswith=more_specific.name)
+
+            for extra in extra_names:
+                new_address = extra.ip_address.address.ip
+                new_dns_name = extra.name
+
+                dns_create.delay(
+                    dns_name=new_dns_name,
+                    address=new_address,
+                    status=extra,
+                    reverse=False,
+                )
+
                 counter += 1
 
             messages.info(request, _("Updating {count} forward records in {name}").format(count=counter,
@@ -99,17 +127,30 @@ class ReverseZoneAdmin(admin.ModelAdmin):
             more_specifics = ReverseZone.objects.filter(prefix__net_contained=zone.prefix).exclude(pk=zone.pk)
 
             # Find all IPAddress objects in this zone but not in the more-specifics
-            addresses = IPAddress.objects.filter(address__net_contained=zone.prefix)
+            ip_addresses = IPAddress.objects.filter(address__net_contained=zone.prefix)
             for more_specific in more_specifics:
-                addresses = addresses.exclude(address__net_contained=more_specific.prefix)
+                ip_addresses = ip_addresses.exclude(address__net_contained=more_specific.prefix)
 
-            for address in addresses:
+            for ip_address in ip_addresses:
-                if address.dns_name:
+                new_address = ip_address.address.ip
-                    update_dns.delay(
+                new_dns_name = normalize_fqdn(ip_address.dns_name)
-                        new_record=address,
+
-                        skip_forward=True
+                if new_dns_name:
+                    status, created = DNSStatus.objects.get_or_create(ip_address=ip_address)
+
+                    dns_create.delay(
+                        dns_name=new_dns_name,
+                        address=new_address,
+                        status=status,
+                        forward=False,
                     )
+
                     counter += 1
 
             messages.info(request, _("Updating {count} reverse records in {name}").format(count=counter,
                                                                                           name=zone.name))
+
+
+@admin.register(ExtraDNSName, site=admin_site)
+class ExtraDNSNameAdmin(admin.ModelAdmin):
+    pass

netbox_ddns/background_tasks.py

@@ -1,16 +1,17 @@
 import logging
-from typing import Optional
+from typing import List, Optional
 
 import dns.query
 import dns.rdatatype
 import dns.resolver
+from django.db import IntegrityError
 from django.db.models.functions import Length
 from django_rq import job
 from dns import rcode
 from netaddr import ip
 
-from ipam.models import IPAddress
 from netbox_ddns.models import ACTION_CREATE, ACTION_DELETE, DNSStatus, ReverseZone, Zone
+from netbox_ddns.utils import normalize_fqdn
 
 logger = logging.getLogger('netbox_ddns')
 
@@ -29,7 +30,7 @@ def get_zone(dns_name: str) -> Optional[Zone]:
 def get_soa(dns_name: str) -> str:
     parts = dns_name.rstrip('.').split('.')
     for i in range(len(parts)):
-        zone_name = '.'.join(parts[i:]) + '.'
+        zone_name = normalize_fqdn('.'.join(parts[i:]))
 
         try:
             dns.resolver.query(zone_name, dns.rdatatype.SOA)
@@ -55,7 +56,7 @@ def get_reverse_zone(address: ip.IPAddress) -> Optional[ReverseZone]:
     return zones[-1]
 
 
-def status_update(output: list, operation: str, response) -> None:
+def status_update(output: List[str], operation: str, response) -> None:
     code = response.rcode()
 
     if code == dns.rcode.NOERROR:
@@ -68,107 +69,73 @@ def status_update(output: list, operation: str, response) -> None:
     output.append(message)
 
 
-@job
+def create_forward(dns_name: str, address: ip.IPAddress, status: Optional[DNSStatus], output: List[str]):
-def update_dns(old_record: IPAddress = None, new_record: IPAddress = None,
+    zone = get_zone(dns_name)
-               skip_forward=False, skip_reverse=False):
-    old_address = old_record.address.ip if old_record else None
-    new_address = new_record.address.ip if new_record else None
-    old_dns_name = old_record.dns_name.rstrip('.') + '.' if old_record and old_record.dns_name else ''
-    new_dns_name = new_record.dns_name.rstrip('.') + '.' if new_record and new_record.dns_name else ''
-
-    output = []
-    status, created = DNSStatus.objects.get_or_create(ip_address=new_record or old_record)
-
-    # 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}")
+        logger.debug(f"Found zone {zone.name} for {dns_name}")
-                status.forward_action = ACTION_DELETE
+        if status:
-
-                # 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)
-                    status_update(output, f'Deleting {old_dns_name} {old_address}', response)
-                    status.forward_rcode = response.rcode()
-                else:
-                    logger.warning(f"Can't update zone {zone.name} for {old_dns_name}, "
-                                   f"it has delegated authority for {soa}")
-                    status.forward_rcode = rcode.NOTAUTH
-            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 and old_dns_name:
-                record_name = zone.record_name(old_address)
-                logger.debug(f"Found zone {zone.name} for {record_name}")
-                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',
-                        old_dns_name
-                    )
-                    response = dns.query.udp(update, zone.server.address)
-                    status_update(output, f'Deleting {record_name} {old_dns_name}', response)
-                    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}")
-                    status.reverse_rcode = rcode.NOTAUTH
-            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}")
             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(new_dns_name)
+        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(
-                        new_dns_name,
+                dns_name,
                 zone.ttl,
-                        'a' if new_address.version == 4 else 'aaaa',
+                record_type,
-                        str(new_address)
+                str(address)
             )
             response = dns.query.udp(update, zone.server.address)
-                    status_update(output, f'Adding {new_dns_name} {new_address}', response)
+            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 {old_dns_name}, "
+            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 {new_dns_name}")
+        logger.debug(f"No zone found for {dns_name}")
 
-        # Add new reverse record
+
-        if not skip_reverse:
+def delete_forward(dns_name: str, address: ip.IPAddress, status: Optional[DNSStatus], output: List[str]):
-            zone = get_reverse_zone(new_address)
+    zone = get_zone(dns_name)
-            if zone and new_dns_name:
+    if zone:
-                record_name = zone.record_name(new_address)
+        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 = get_reverse_zone(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
@@ -179,19 +146,84 @@ def update_dns(old_record: IPAddress = None, new_record: IPAddress = None,
                 record_name,
                 zone.ttl,
                 'ptr',
-                        new_dns_name
+                dns_name
             )
             response = dns.query.udp(update, zone.server.address)
-                    status_update(output, f'Adding {record_name} {new_dns_name}', response)
+            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 {new_address}")
+        logger.debug(f"No zone found for {address}")
 
-    # Store the status
+
+def delete_reverse(dns_name: str, address: ip.IPAddress, status: Optional[DNSStatus], output: List[str]):
+    zone = get_reverse_zone(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}")
+
+
+@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)

netbox_ddns/forms.py

@@ -0,0 +1,10 @@
+from django import forms
+
+from netbox_ddns.models import ExtraDNSName
+from utilities.forms import BootstrapMixin
+
+
+class ExtraDNSNameEditForm(BootstrapMixin, forms.ModelForm):
+    class Meta:
+        model = ExtraDNSName
+        fields = ['name']

netbox_ddns/migrations/0005_extradnsname.py

@@ -0,0 +1,34 @@
+# Generated by Django 3.0.5 on 2020-04-18 22:20
+
+from django.db import migrations, models
+import django.db.models.deletion
+import netbox_ddns.validators
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('ipam', '0036_standardize_description'),
+        ('netbox_ddns', '0004_ensure_trailing_dot'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='ExtraDNSName',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False)),
+                ('last_update', models.DateTimeField(auto_now=True)),
+                ('forward_action', models.PositiveSmallIntegerField(blank=True, null=True)),
+                ('forward_rcode', models.PositiveIntegerField(blank=True, null=True)),
+                ('reverse_action', models.PositiveSmallIntegerField(blank=True, null=True)),
+                ('reverse_rcode', models.PositiveIntegerField(blank=True, null=True)),
+                ('name', models.CharField(max_length=255, validators=[netbox_ddns.validators.HostnameValidator()])),
+                ('ip_address', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='ipam.IPAddress')),
+            ],
+            options={
+                'verbose_name': 'extra DNS name',
+                'verbose_name_plural': 'extra DNS names',
+                'unique_together': {('ip_address', 'name')},
+            },
+        ),
+    ]

netbox_ddns/migrations/0006_extradns_cname.py

@@ -0,0 +1,21 @@
+# Generated by Django 3.0.5 on 2020-04-19 16:21
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('netbox_ddns', '0005_extradnsname'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='extradnsname',
+            name='reverse_action',
+        ),
+        migrations.RemoveField(
+            model_name='extradnsname',
+            name='reverse_rcode',
+        ),
+    ]

netbox_ddns/migrations/0007_zone_meta.py

@@ -0,0 +1,17 @@
+# Generated by Django 3.0.5 on 2020-04-19 19:15
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('netbox_ddns', '0006_extradns_cname'),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name='zone',
+            options={'ordering': ('name',), 'verbose_name': 'forward zone', 'verbose_name_plural': 'forward zones'},
+        ),
+    ]

netbox_ddns/models.py

@@ -6,6 +6,7 @@ import dns.tsigkeyring
 import dns.update
 from django.core.exceptions import ValidationError
 from django.db import models
+from django.utils.html import format_html
 from django.utils.translation import gettext_lazy as _
 from dns import rcode
 from dns.tsig import HMAC_MD5, HMAC_SHA1, HMAC_SHA224, HMAC_SHA256, HMAC_SHA384, HMAC_SHA512
@@ -13,6 +14,7 @@ from netaddr import ip
 
 from ipam.fields import IPNetworkField
 from ipam.models import IPAddress
+from .utils import normalize_fqdn
 from .validators import HostnameAddressValidator, HostnameValidator, validate_base64
 
 logger = logging.getLogger('netbox_ddns')
@@ -93,7 +95,7 @@ class Server(models.Model):
         self.server = self.server.lower().rstrip('.')
 
         # Ensure trailing dots from domain-style fields
-        self.tsig_key_name = self.tsig_key_name.lower().rstrip('.') + '.'
+        self.tsig_key_name = normalize_fqdn(self.tsig_key_name.lower().rstrip('.'))
 
     @property
     def address(self) -> Optional[str]:
@@ -104,7 +106,7 @@ class Server(models.Model):
 
     def create_update(self, zone: str) -> dns.update.Update:
         return dns.update.Update(
-            zone=zone.rstrip('.') + '.',
+            zone=normalize_fqdn(zone),
             keyring=dns.tsigkeyring.from_text({
                 self.tsig_key_name: self.tsig_key
             }),
@@ -131,15 +133,15 @@ class Zone(models.Model):
 
     class Meta:
         ordering = ('name',)
-        verbose_name = _('zone')
+        verbose_name = _('forward zone')
-        verbose_name_plural = _('zones')
+        verbose_name_plural = _('forward zones')
 
     def __str__(self):
         return self.name
 
     def clean(self):
         # Ensure trailing dots from domain-style fields
-        self.name = self.name.lower().rstrip('.') + '.'
+        self.name = normalize_fqdn(self.name)
 
     def get_updater(self):
         return self.server.create_update(self.name)
@@ -221,7 +223,7 @@ class ReverseZone(models.Model):
                     self.name = f'{nibble}.{self.name}'
 
         # Ensure trailing dots from domain-style fields
-        self.name = self.name.lower().rstrip('.') + '.'
+        self.name = normalize_fqdn(self.name)
 
 
 class DNSStatus(models.Model):
@@ -230,6 +232,7 @@ class DNSStatus(models.Model):
         verbose_name=_('IP address'),
         on_delete=models.CASCADE,
     )
+
     last_update = models.DateTimeField(
         verbose_name=_('last update'),
         auto_now=True,
@@ -266,5 +269,69 @@ class DNSStatus(models.Model):
     def get_forward_rcode_display(self) -> Optional[str]:
         return get_rcode_display(self.forward_rcode)
 
+    def get_forward_rcode_html_display(self) -> Optional[str]:
+        output = get_rcode_display(self.forward_rcode)
+        colour = 'green' if self.forward_rcode == rcode.NOERROR else 'red'
+        return format_html('<span style="color:{colour}">{output}</span', colour=colour, output=output)
+
     def get_reverse_rcode_display(self) -> Optional[str]:
         return get_rcode_display(self.reverse_rcode)
+
+    def get_reverse_rcode_html_display(self) -> Optional[str]:
+        output = get_rcode_display(self.reverse_rcode)
+        colour = 'green' if self.reverse_rcode == rcode.NOERROR else 'red'
+        return format_html('<span style="color:{colour}">{output}</span', colour=colour, output=output)
+
+
+class ExtraDNSName(models.Model):
+    ip_address = models.ForeignKey(
+        to=IPAddress,
+        verbose_name=_('IP address'),
+        on_delete=models.CASCADE,
+    )
+    name = models.CharField(
+        verbose_name=_('DNS name'),
+        max_length=255,
+        validators=[HostnameValidator()],
+    )
+
+    last_update = models.DateTimeField(
+        verbose_name=_('last update'),
+        auto_now=True,
+    )
+
+    forward_action = models.PositiveSmallIntegerField(
+        verbose_name=_('forward record action'),
+        choices=ACTION_CHOICES,
+        blank=True,
+        null=True,
+    )
+    forward_rcode = models.PositiveIntegerField(
+        verbose_name=_('forward record response'),
+        blank=True,
+        null=True,
+    )
+
+    before_save = None
+
+    class Meta:
+        unique_together = (
+            ('ip_address', 'name'),
+        )
+        verbose_name = _('extra DNS name')
+        verbose_name_plural = _('extra DNS names')
+
+    def __str__(self):
+        return self.name
+
+    def clean(self):
+        # Ensure trailing dots from domain-style fields
+        self.name = normalize_fqdn(self.name)
+
+    def get_forward_rcode_display(self) -> Optional[str]:
+        return get_rcode_display(self.forward_rcode)
+
+    def get_forward_rcode_html_display(self) -> Optional[str]:
+        output = get_rcode_display(self.forward_rcode)
+        colour = 'green' if self.forward_rcode == rcode.NOERROR else 'red'
+        return format_html('<span style="color:{colour}">{output}</span', colour=colour, output=output)

netbox_ddns/signals.py

@@ -4,7 +4,9 @@ from django.db.models.signals import post_delete, post_save, pre_save
 from django.dispatch import receiver
 
 from ipam.models import IPAddress
-from netbox_ddns.background_tasks import update_dns
+from netbox_ddns.background_tasks import dns_create, dns_delete
+from netbox_ddns.models import DNSStatus, ExtraDNSName
+from netbox_ddns.utils import normalize_fqdn
 
 logger = logging.getLogger('netbox_ddns')
 
@@ -16,19 +18,114 @@ def store_original_ipaddress(instance: IPAddress, **_kwargs):
 
 @receiver(post_save, sender=IPAddress)
 def trigger_ddns_update(instance: IPAddress, **_kwargs):
-    old_address = instance.before_save.address if instance.before_save else None
+    old_address = instance.before_save.address.ip if instance.before_save else None
-    old_dns_name = instance.before_save.dns_name if instance.before_save else ''
+    old_dns_name = normalize_fqdn(instance.before_save.dns_name) if instance.before_save else ''
 
-    if instance.address != old_address or instance.dns_name != old_dns_name:
+    new_address = instance.address.ip
-        # IP address or DNS name has changed
+    new_dns_name = normalize_fqdn(instance.dns_name)
-        update_dns.delay(
+
-            old_record=instance.before_save,
+    extra_dns_names = {normalize_fqdn(extra.name): extra for extra in instance.extradnsname_set.all()}
-            new_record=instance,
+
+    if new_address != old_address or new_dns_name != old_dns_name:
+        status, created = DNSStatus.objects.get_or_create(ip_address=instance)
+
+        if old_address and old_dns_name and old_dns_name not in extra_dns_names:
+            delete = dns_delete.delay(
+                dns_name=old_dns_name,
+                address=old_address,
+                status=status,
+            )
+        else:
+            delete = None
+
+        if new_address and new_dns_name:
+            dns_create.delay(
+                dns_name=new_dns_name,
+                address=new_address,
+                status=status,
+                depends_on=delete,
+            )
+
+    if old_address != new_address:
+        # This affects extra names
+        for dns_name, status in extra_dns_names.items():
+            # Don't touch the main dns_name
+            if dns_name == old_dns_name or dns_name == new_dns_name:
+                continue
+
+            if old_dns_name:
+                delete = dns_delete.delay(
+                    dns_name=dns_name,
+                    address=old_address,
+                    reverse=False,
+                    status=status,
+                )
+            else:
+                delete = None
+
+            if new_dns_name:
+                dns_create.delay(
+                    dns_name=dns_name,
+                    address=new_address,
+                    reverse=False,
+                    status=status,
+                    depends_on=delete,
                 )
 
 
 @receiver(post_delete, sender=IPAddress)
 def trigger_ddns_delete(instance: IPAddress, **_kwargs):
-    update_dns.delay(
+    old_address = instance.address.ip
-        old_record=instance,
+    old_dns_name = normalize_fqdn(instance.dns_name)
+
+    if old_address and old_dns_name:
+        dns_delete.delay(
+            address=old_address,
+            dns_name=old_dns_name,
+        )
+
+
+@receiver(pre_save, sender=ExtraDNSName)
+def store_original_extra(instance: ExtraDNSName, **_kwargs):
+    instance.before_save = ExtraDNSName.objects.filter(pk=instance.pk).first()
+
+
+@receiver(post_save, sender=ExtraDNSName)
+def trigger_extra_ddns_update(instance: ExtraDNSName, **_kwargs):
+    address = instance.ip_address.address.ip
+    old_dns_name = instance.before_save.name if instance.before_save else ''
+    new_dns_name = instance.name
+
+    if new_dns_name != old_dns_name:
+        if old_dns_name:
+            delete = dns_delete.delay(
+                dns_name=old_dns_name,
+                address=address,
+                reverse=False,
+                status=instance,
+            )
+        else:
+            delete = None
+
+        dns_create.delay(
+            dns_name=new_dns_name,
+            address=address,
+            status=instance,
+            reverse=False,
+            depends_on=delete,
+        )
+
+
+@receiver(post_delete, sender=ExtraDNSName)
+def trigger_extra_ddns_delete(instance: ExtraDNSName, **_kwargs):
+    address = instance.ip_address.address.ip
+    old_dns_name = instance.name
+
+    if old_dns_name == normalize_fqdn(instance.ip_address.dns_name):
+        return
+
+    dns_delete.delay(
+        dns_name=old_dns_name,
+        address=address,
+        reverse=False,
     )

netbox_ddns/tables.py

@@ -0,0 +1,44 @@
+import django_tables2 as tables
+
+from netbox_ddns.models import ExtraDNSName
+from utilities.tables import BaseTable, ToggleColumn
+
+FORWARD_DNS = """
+    {% if record.forward_action is not None %}
+        {{ record.get_forward_action_display }}:
+        {{ record.get_forward_rcode_html_display }}
+    {% else %}
+        <span class="text-muted">Not created</span>
+    {% endif %}
+"""
+
+ACTIONS = """
+    {% if perms.dcim.change_extradnsname %}
+        <a href="{% url 'plugins:netbox_ddns:extradnsname_edit' ipaddress_pk=record.ip_address.pk pk=record.pk %}" 
+           class="btn btn-xs btn-warning">
+            <i class="glyphicon glyphicon-pencil" aria-hidden="true"></i>
+        </a>
+    {% endif %}
+    {% if perms.dcim.delete_extradnsname %}
+        <a href="{% url 'plugins:netbox_ddns:extradnsname_delete' ipaddress_pk=record.ip_address.pk pk=record.pk %}"
+           class="btn btn-xs btn-danger">
+            <i class="glyphicon glyphicon-trash" aria-hidden="true"></i>
+        </a>
+    {% endif %}
+"""
+
+
+class PrefixTable(BaseTable):
+    pk = ToggleColumn()
+    name = tables.Column()
+    last_update = tables.Column()
+    forward_dns = tables.TemplateColumn(template_code=FORWARD_DNS)
+    actions = tables.TemplateColumn(
+        template_code=ACTIONS,
+        attrs={'td': {'class': 'text-right text-nowrap noprint'}},
+        verbose_name=''
+    )
+
+    class Meta(BaseTable.Meta):
+        model = ExtraDNSName
+        fields = ('pk', 'name', 'last_update', 'forward_dns', 'actions')

netbox_ddns/template_content.py

@@ -1,6 +1,7 @@
 from django.contrib.auth.context_processors import PermWrapper
 
 from extras.plugins import PluginTemplateExtension
+from . import tables
 
 
 # noinspection PyAbstractClass
@@ -9,9 +10,17 @@ class DNSInfo(PluginTemplateExtension):
 
     def left_page(self):
         """
-        An info-box with edit button for the vCenter settings
+        An info-box with the status of the DNS modifications and records
         """
-        return self.render('netbox_ddns/ipaddress/dns_info.html')
+        extra_dns_name_table = tables.PrefixTable(list(self.context['object'].extradnsname_set.all()), orderable=False)
+
+        return (
+                self.render('netbox_ddns/ipaddress/dns_info.html') +
+                self.render('netbox_ddns/ipaddress/dns_extra.html', {
+                    'perms': PermWrapper(self.context['request'].user),
+                    'extra_dns_name_table': extra_dns_name_table,
+                })
+        )
 
 
 template_extensions = [DNSInfo]

netbox_ddns/templates/netbox_ddns/ipaddress/dns_extra.html

@@ -0,0 +1,20 @@
+{% load render_table from django_tables2 %}
+
+{% if perms.netbox_ddns.view_extradnsname %}
+    <div class="panel panel-default">
+        <div class="panel-heading">
+            <strong>Extra DNS Names</strong>
+        </div>
+
+        {% render_table extra_dns_name_table 'inc/table.html' %}
+
+        {% if perms.netbox_ddns.add_extradnsname %}
+            <div class="panel-footer text-right noprint">
+                <a href="{% url 'plugins:netbox_ddns:extradnsname_create' ipaddress_pk=object.pk %}"
+                   class="btn btn-xs btn-primary">
+                    <span class="glyphicon glyphicon-plus" aria-hidden="true"></span> Add extra DNS name
+                </a>
+            </div>
+        {% endif %}
+    </div>
+{% endif %}

netbox_ddns/templates/netbox_ddns/ipaddress/dns_info.html

@@ -16,7 +16,7 @@
                     <td>
                         {% if object.dnsstatus.forward_action is not None %}
                             {{ object.dnsstatus.get_forward_action_display }}:
-                            {{ object.dnsstatus.get_forward_rcode_display }}
+                            {{ object.dnsstatus.get_forward_rcode_html_display }}
                         {% else %}
                             <span class="text-muted">Not created</span>
                         {% endif %}
@@ -27,7 +27,7 @@
                     <td>
                         {% if object.dnsstatus.reverse_action is not None %}
                             {{ object.dnsstatus.get_reverse_action_display }}:
-                            {{ object.dnsstatus.get_reverse_rcode_display }}
+                            {{ object.dnsstatus.get_reverse_rcode_html_display }}
                         {% else %}
                             <span class="text-muted">Not created</span>
                         {% endif %}

netbox_ddns/urls.py

@@ -1 +1,15 @@
-urlpatterns = []
+from django.urls import path
+
+from .views import ExtraDNSNameCreateView, ExtraDNSNameDeleteView, ExtraDNSNameEditView
+
+urlpatterns = [
+    path(route='ip-addresses/<int:ipaddress_pk>/extra/create/',
+         view=ExtraDNSNameCreateView.as_view(),
+         name='extradnsname_create'),
+    path(route='ip-addresses/<int:ipaddress_pk>/extra/<int:pk>/edit/',
+         view=ExtraDNSNameEditView.as_view(),
+         name='extradnsname_edit'),
+    path(route='ip-addresses/<int:ipaddress_pk>/extra/<int:pk>/delete/',
+         view=ExtraDNSNameDeleteView.as_view(),
+         name='extradnsname_delete'),
+]

netbox_ddns/utils.py

@@ -0,0 +1,5 @@
+def normalize_fqdn(dns_name: str) -> str:
+    if not dns_name:
+        return ''
+
+    return dns_name.lower().rstrip('.') + '.'

netbox_ddns/views.py

@@ -0,0 +1,52 @@
+from django.contrib.auth.mixins import PermissionRequiredMixin
+from django.http import Http404
+from django.shortcuts import get_object_or_404
+from django.urls import reverse
+from django.utils.http import is_safe_url
+
+from ipam.models import IPAddress
+from netbox_ddns.forms import ExtraDNSNameEditForm
+from netbox_ddns.models import ExtraDNSName
+from utilities.views import ObjectDeleteView, ObjectEditView
+
+
+class ExtraDNSNameObjectMixin:
+    def get_object(self, kwargs):
+        if 'ipaddress_pk' not in kwargs:
+            raise Http404
+
+        ip_address = get_object_or_404(IPAddress, pk=kwargs['ipaddress_pk'])
+
+        if 'pk' in kwargs:
+            return get_object_or_404(ExtraDNSName, ip_address=ip_address, pk=kwargs['pk'])
+
+        return ExtraDNSName(ip_address=ip_address)
+
+    def get_return_url(self, request, obj=None):
+        # First, see if `return_url` was specified as a query parameter or form data. Use this URL only if it's
+        # considered safe.
+        query_param = request.GET.get('return_url') or request.POST.get('return_url')
+        if query_param and is_safe_url(url=query_param, allowed_hosts=request.get_host()):
+            return query_param
+
+        # Otherwise check we have an object and can return to its ip-address
+        elif obj is not None and obj.ip_address is not None:
+            return obj.ip_address.get_absolute_url()
+
+        # If all else fails, return home. Ideally this should never happen.
+        return reverse('home')
+
+
+class ExtraDNSNameCreateView(PermissionRequiredMixin, ExtraDNSNameObjectMixin, ObjectEditView):
+    permission_required = 'netbox_ddns.add_extradnsname'
+    model = ExtraDNSName
+    model_form = ExtraDNSNameEditForm
+
+
+class ExtraDNSNameEditView(ExtraDNSNameCreateView):
+    permission_required = 'netbox_ddns.change_extradnsname'
+
+
+class ExtraDNSNameDeleteView(PermissionRequiredMixin, ExtraDNSNameObjectMixin, ObjectDeleteView):
+    permission_required = 'netbox_ddns.delete_extradnsname'
+    model = ExtraDNSName