nixos-config/includes/local-dns/default.nix

{ config, pkgs, ... }:
let
  local-dns = pkgs.runCommand "local-dns" {} ''
    mkdir -p $out/bin
    cp ${./local-dns} $out/bin/local-dns
  '';
in
{
  environment.systemPackages = [ local-dns ];

  services.unbound = {
    enable = true;
    extraConfig = ''
      include: /var/lib/unbound/unbound-resolvconf.conf
      remote-control:
        control-enable: yes
        control-interface: /var/lib/unbound/unbound.sock
    '';
  };

  # make unbound use unbound group instead so that the control socket is secure
  # instead of being in nogroup
  users.users.unbound.group = "unbound";
  users.groups.unbound = {};

  # actually have openresolv update our DNS
  networking.resolvconf.extraConfig = ''
    unbound_conf=/var/lib/unbound/unbound-resolvconf.conf
    unbound_restart="${pkgs.unbound}/bin/unbound-control -c /var/lib/unbound/unbound.conf reload || true"
  '';
}