nilsandClaude Opus 5.5
5ddff44a35
Kea skips interfaces without carrier when it opens its sockets and only looks again on a reload, so a LAN cable plugged in after Kea started got no DHCP until a restart. networkd-dispatcher now restarts Kea when a DHCP LAN gets carrier (a restart: a SIGHUP while Kea is starting ends it). The rule script is the same for every configuration and reads the interfaces from /etc/router/dhcp-interfaces, so the device never has to rebuild it (writeShellApplication's shellcheck could not be built offline). The web UI refused every login from a browser with "forbidden": under Referrer-Policy no-referrer browsers send "Origin: null" with form posts. Use http.CrossOriginProtection (Sec-Fetch-Site, then Origin) and a same-origin referrer policy. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01AeFqV9dZrK6nipHkPfyM4F
80 lines
2.6 KiB
Nix
80 lines
2.6 KiB
Nix
{
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config,
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lib,
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pkgs,
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...
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}:
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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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# Kea skips interfaces without carrier when it opens its sockets and only
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# looks again on a reload: a LAN cable plugged in after boot would get no
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# DHCP until a restart. So restart it when a DHCP LAN gets carrier.
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services.networkd-dispatcher = {
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enable = true;
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rules.kea-carrier = {
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onState = [
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"carrier"
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"degraded"
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"routable"
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];
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# The same for every configuration (the interfaces are in /etc): the
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# module builds it with writeShellApplication, whose shellcheck run
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# could not be rebuilt offline on the device.
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# Not a reload: a SIGHUP while Kea is still starting ends it (cleanly,
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# so systemd does not restart it).
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script = ''
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if ${pkgs.gnugrep}/bin/grep -qxF "$IFACE" /etc/router/dhcp-interfaces; then
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${config.systemd.package}/bin/systemctl try-restart --no-block kea-dhcp4-server.service
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fi
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'';
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};
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};
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environment.etc."router/dhcp-interfaces".text = lib.concatMapStrings (l: "${l.device}\n") 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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