{ config, lib, pkgs, ... }:

let
  name = "zeek";

  cfg = config.services.zeek;

in {

  ###### interface

  options.services.zeek = {
    enable = lib.mkOption {
      type = lib.types.bool;
      description = "Whether to enable Zeek.";
      default = false;
    };

    interface = lib.mkOption {
      type = lib.types.str;
    };

  };

  ###### implementation

  config = lib.mkIf cfg.enable {
    systemd.services.zeek = {
      description = "Zeek network monitor";
      wantedBy = [ "multi-user.target" ];
      after = [ "network.target" ];
      serviceConfig = {
        #DynamicUser = true;
        PermissionsStartOnly = true;
        ExecStartPre = "${pkgs.coreutils}/bin/mkdir -p /var/log/zeek";
        ExecStart = "${pkgs.zeek}/bin/zeek -i ${cfg.interface}";
        CapabilityBoundingSet = "CAP_NET_RAW CAP_NET_ADMIN";
        #NoNewPrivileges = true;
        #ProtectControlGroups = true;
        #ProtectKernelModules = true;
        #ProtectKernelTunables = true;
        #ProtectSystem = true;
        #RestrictAddressFamilies = "AF_INET AF_INET6 AF_PACKET AF_UNIX";
        #RestrictNamespaces = true;
        RuntimeDirectory = name;
        StateDirectory = name;
        WorkingDirectory = /var/log/zeek;
      };
    };
    security.wrappers.zeek-packet = {
      source = "${pkgs.zeek}/bin/zeek";
      capabilities = "cap_net_raw+eip";
    };
  };
}