configure auth-dns to use netbox-fetched data

data/zones/noc.eh22.intern.zone

@@ -0,0 +1,6 @@
+$ORIGIN noc.eh22.intern.
+@ 0 IN SOA auth-dns noc.eh22.easterhegg.eu. 1 7200 3600 3600000 60
+@ 0 IN NS 10.20.25.3.
+auth-dns 0 IN A 10.20.25.3
+proxmox 0 IN A 10.20.25.1
+sketchy-router 0 IN A 10.20.25.2

flake.nix

@@ -84,6 +84,12 @@
             ssh-to-age
             pre-commit
             sops
+            python312
+            python312Packages.pynetbox
+            python312Packages.dnspython
+            python312Packages.ipython
+            # custom packages
+            fetch-netbox-data
           ];
         };
       });

packages/default.nix

@@ -2,5 +2,6 @@
 {
   # add new packages here as:
   # name = pkgs.callPackage ./package-source.nix {};
+  fetch-netbox-data = pkgs.callPackage ./fetch-netbox-data { };
   installer = flake.outputs.nixosConfigurations.installer.config.system.build.isoImage;
 }

packages/fetch-netbox-data/default.nix

@@ -0,0 +1,23 @@
+{ python3 }:
+python3.pkgs.buildPythonApplication {
+  name = "fetch-netbox-data";
+  version = "1.0.0";
+  src = ./.;
+  pyproject = false;
+
+  propagatedBuildInputs = with python3.pkgs; [
+    pynetbox
+    dnspython
+  ];
+
+  installPhase = ''
+    runHook preInstall
+    install -Dm755 ./fetch-netbox-data.py $out/bin/fetch-netbox-data
+    runHook postInstall
+  '';
+
+  meta = {
+    mainProgram = "fetch-netbox-data";
+    platforms = python3.meta.platforms;
+  };
+}

packages/fetch-netbox-data/fetch-netbox-data.py

@@ -0,0 +1,55 @@
+#!/usr/bin/env python3
+import pynetbox
+import argparse
+from dns import rdatatype
+from dns import rdataclass
+from dns.rdtypes.ANY.SOA import SOA
+from dns.rdtypes.ANY.NS import NS
+from dns.rdtypes.IN.A import A
+from dns.zone import Zone
+from pathlib import Path
+
+
+def build_auth_dns_zones(nb: pynetbox.api, nox_dir: Path):
+    zones_dir = nox_dir / "data" / "zones"
+    zones_dir.mkdir(parents=True,exist_ok=True)
+    print(f"Fetching IPAM data to build authorative zonefiles in {zones_dir}")
+
+    print(f"Building zone noc.eh22.intern")
+    zonefile_path = zones_dir / "noc.eh22.intern.zone"
+
+    # build zone management stuff (SOA record, NS record)
+    zone = Zone(origin="noc.eh22.intern")
+    zone.get_rdataset("@", rdtype=rdatatype.SOA, create=True)\
+        .add(SOA(rdclass=rdataclass.IN, rdtype=rdatatype.SOA, mname="auth-dns.noc.eh22.intern.", rname="noc.eh22.easterhegg.eu.", serial=1, refresh=7200, retry=3600, expire=3600000, minimum=60))
+    zone.get_rdataset("@", rdtype=rdatatype.NS, create=True)\
+        .add(NS(rdclass=rdataclass.IN, rdtype=rdatatype.NS, target="10.20.25.3"))
+
+    # iterate over all ip addresses with dns names ending in noc.eh22.intern
+    for i_addr in nb.ipam.ip_addresses.filter("noc.eh22.intern"):
+        raw_addr = i_addr.address.rsplit("/", maxsplit=1)[0]
+        relative_name = i_addr.dns_name.removesuffix(".noc.eh22.intern")
+        if i_addr.family.value == 4:
+            zone.get_rdataset(relative_name, rdtype=rdatatype.A, create=True)\
+                .add(A(rdclass=rdataclass.IN, rdtype=rdatatype.A, address=raw_addr))
+        else:
+            raise RuntimeError(f"Got unknown IP family {i_addr.family} ({i_addr.family.value})")
+
+    with open(zonefile_path, mode="w") as f:
+        zone.to_file(f, want_comments=True, want_origin=True)
+
+
+def main():
+    argp = argparse.ArgumentParser(prog="fetch-netbox-data", description="Fetch current IPAM data from netbox")
+    argp.add_argument("--base-url", default="https://netbox.eh22.easterhegg.eu", help="URL of the netbox installation")
+    argp.add_argument("--token", required=True, help="Netbox API Token")
+    argp.add_argument("--nox-dir", required=True, type=Path, help="Path to the nox repository")
+    args = argp.parse_args()
+
+    nb = pynetbox.api(args.base_url, token=args.token)
+    build_auth_dns_zones(nb, args.nox_dir)
+
+
+
+if __name__ == "__main__":
+    main()

secrets/passwords.yaml

@@ -1,4 +1,7 @@
 services:
+    netbox.eh22.easterhegg.eu:
+        noc: ENC[AES256_GCM,data:OX05HjLYVoMP4My97eijGjWDl+lyTBFa,iv:EDOWfkNZUrFFyrX63LhA4O8lqfmckOHcXRN0qzgn3u4=,tag:AwrwlwGoKih2qkbvmQIGFQ==,type:str]
+        noc_token: ENC[AES256_GCM,data:7WrIXDtjYKRVgA+r2iVcaT4zf+ftRTEQDEduu77j3RkvSX1e2UCNvg==,iv:B1r+wHg3AJKVj7PKS34G9FD/2Q1yngXdueqVJ0JIfY0=,tag:1w9FO2fPPK0gkInrtEZyBg==,type:str]
     proxmox:
         root: ENC[AES256_GCM,data:RVv1d/nB9pgcERkujSasoLY+cR3OO3NWxw==,iv:EHkUDxP6XB2JWeDtno2rcVvBQdJ/jmG5HjRjPppfS0A=,tag:obzij0BkGLJoXfUbqWLRjw==,type:str]
 hardware:
@@ -24,8 +27,8 @@ sops:
             Q0ZGUFBmUWpUYjR5OUwxOUplblZ0SmcKtMl1KoYwPb776zz8FfFnf0s7XlnOLnuU
             nXkPxRaDel/3EsLnfhcONRAKTGdleRHAXQVIGHrs/jjnZ2OJgXIzYA==
             -----END AGE ENCRYPTED FILE-----
-    lastmodified: "2025-02-10T16:13:13Z"
-    mac: ENC[AES256_GCM,data:k7lqf+JNpnmbKYjMuu82Q1DPtYsL7jAfwUh8QEjpyq9+Qael1dyV0e1yn/H1prLuZIbebT1rYX6s/MhT3t7Ts88bQHmf/EDyCeOPnRfRctzY1jQPPKbE3Pe7vtEnx5r/DEksi1Jh8vMoqHYcB987WPjAQn27P58UXYJROpqaSwg=,iv:fT9JnWYs8lEjXL3pXHtERRxccGd/ocb6KCc8gGbpBJg=,tag:rMvQoihg53GSNhYiNtypuQ==,type:str]
+    lastmodified: "2025-02-21T18:34:34Z"
+    mac: ENC[AES256_GCM,data:yeMXclT2ZdxHy2CqWQkXVay4EHHq2o8dXF2yXa7q1FKyteRzf0Gve/IQVxH3VXYsGQf3lSdL5EAe3BXmNesWnA5QfTELt2hzgd5nQ6+NTzLDXmi/AW3L4BhzpOoK7UIJ+mG42N4mkYlBe1dUyDBikxevWB3AAzGl7mAF/2io4TQ=,iv:d4g5dWUhFBauR8+4aPGU1hYkhyGsmdGBjgwBMs0HbtA=,tag:oOYKKCwOw/gjqeB/SCdkuQ==,type:str]
     pgp: []
     unencrypted_suffix: _unencrypted
     version: 3.9.4

systems/auth-dns.noc.eh22.intern.nix

@@ -1,26 +1,15 @@
 {
   pkgs,
+  lib,
   ...
 }:
 let
-  noc_eh22_internZone = ''
-    $ORIGIN noc.eh22.intern.
-    $TTL 3600
-
-    ; zone management
-    noc.eh22.intern.    IN SOA auth-dns.noc.eh22.intern. noc.eh22.esterhegg.eu. (
-      1       ; serial (automatically incremented by knot)
-      7200    ; refresh
-      3600    ; retry
-      3600000 ; expire
-      60      ; negative response caching ttl
-    )
-    @           IN  NS   auth-dns
-
-    ; A/AAAA records
-    proxmox     IN  A    10.31.210.248
-    auth-dns    IN  A    10.31.210.253
-  '';
+  zones = (
+    lib.attrsets.mapAttrs' (name: fileType: {
+      name = name;
+      value = ../data/zones/${name};
+    }) (builtins.readDir ../data/zones)
+  );
 
   knotConf = pkgs.writeText "knot.conf" ''
     server:
@@ -48,7 +37,15 @@ in
   # enable knot authorative dns server
   # ref: https://search.nüschtos.de/?query=services.knot
   #      https://www.knot-dns.cz/docs/3.4/html/configuration.html
-  environment.etc."knot/zones/noc.eh22.intern.zone".text = noc_eh22_internZone;
+  environment.etc = (
+    lib.attrsets.mapAttrs' (name: value: {
+      name = "knot/zones/noc.eh22.intern.zone";
+      value = {
+        source = value;
+      };
+    }) zones
+  );
+
   services.knot = {
     enable = true;
     settingsFile = knotConf;

systems/sketchy-router.noc.eh22.intern.nix

@@ -69,6 +69,12 @@
               id = 300;
               subnet = "10.20.25.0/24";
               pools = [ { pool = "10.20.25.100 - 10.20.25.254"; } ];
+              reservations = [
+                {
+                  hw-address = "bc:24:11:c1:8a:a4";
+                  ip-address = "10.20.25.3";
+                }
+              ];
             }
           ];
         }