{pkgs, lib, config, system, ...}: {
options = {
  enable = lib.mkEnableOption "friot";
  networking.domainBase = lib.mkOption {
    type        = types.str;
    description = "Base network name.";
    example     = "example";
  };
  networking.domainAliases = lib.mkOption {
    type        = types.listOf types.str;
    description = "Domain aliases.";
    example     = [ "example.org" "example.net" ];
  };
  networking.zones = lib.mkOption {
    type = types.attrsOf (types.submodule ({name, options, config, ...}: {
      options = {
        iface = lib.mkOption {
          type        = types.str;
          description = "Interface name.";
          example     = "eth0";
        };
        ipv4 = lib.mkOption {
          type        = types.str;
          description = "Static IPv4 address of the machine.";
          example     = "1.2.3.4";
        };
        ipv6 = lib.mkOption {
          type        = types.str;
          description = "Static IPv6 address of the machine.";
          example     = "fe80::1";
        };
      };
    }));
  };
};
}