nilsandClaude Sonnet 5.5
b5429ad876
DNS and DHCP (needed to replace a dnsmasq-based router): - router.dns.domain/hosts/overrides/forwardZones: authoritative local domain, split-horizon host records with reverse entries, wildcard overrides and per-zone forwarders (private zones skip DNSSEC). - lans.<n>.dhcp.reservations: Kea host reservations, published in DNS. - Tunnels with dns = true admit what their peers route, so a site-to-site peer without a transfer address can use the resolver. Installer: - router-install wipes a disk, creates an ESP and an ext4 root and installs a prebuilt system with its secrets; nothing is built on the box. installed-layout is the shared disk layout contract. - lib.mkInstaller builds an ISO for a given nixosSystem; packages.installer-example is the example's ISO. Covered by the dns and installer VM tests (the latter installs onto an empty disk and boots it under UEFI), wireguard DNS and assertion cases. PLAN.md records the remaining gaps for replacing the hand-written router. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
50 lines
1.5 KiB
Nix
50 lines
1.5 KiB
Nix
{ config, lib, ... }:
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let
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cfg = config.router;
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dhcpLans = lib.filter (l: l.dhcp.enable) (lib.attrValues cfg.lans);
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ipv4 = (import ./lib.nix { inherit lib; }).ipv4;
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in
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{
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config = lib.mkIf (cfg.enable && dhcpLans != [ ]) {
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services.kea.dhcp4 = {
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enable = true;
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settings = {
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interfaces-config = {
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interfaces = map (l: l.device) dhcpLans;
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# Interfaces are configured asynchronously by networkd.
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re-detect = true;
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};
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lease-database = {
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type = "memfile";
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persist = true;
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name = "/var/lib/kea/dhcp4.leases";
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};
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valid-lifetime = 3600;
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# The ID keys persistent leases, so derive it from the network address:
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# stable when LANs are added or removed (an index would shift).
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subnet4 = map (l: {
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id = ipv4.networkOf (ipv4.parse l.ipv4.address) l.ipv4.prefixLength;
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inherit (l.ipv4) subnet;
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interface = l.device;
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pools = [ { pool = "${l.dhcp.pool.start} - ${l.dhcp.pool.end}"; } ];
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reservations = lib.mapAttrsToList (hostname: r: {
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hw-address = lib.toLower r.mac;
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ip-address = r.address;
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inherit hostname;
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}) l.dhcp.reservations;
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option-data = [
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{
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name = "routers";
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data = l.ipv4.address;
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}
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{
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name = "domain-name-servers";
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data = l.ipv4.address;
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}
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];
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}) dhcpLans;
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};
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};
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};
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}
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