nixos/dae: add more config options

nixos/modules/services/networking/dae.nix

@@ -1,41 +1,151 @@
-{ config, pkgs, lib, ... }:
+{ config, lib, pkgs, ... }:
+
 let
   cfg = config.services.dae;
+  assets = cfg.assets;
+  genAssetsDrv = paths: pkgs.symlinkJoin {
+    name = "dae-assets";
+    inherit paths;
+  };
 in
 {
-  meta.maintainers = with lib.maintainers; [ pokon548 ];
+  meta.maintainers = with lib.maintainers; [ pokon548 oluceps ];
 
   options = {
-    services.dae = {
-      enable = lib.options.mkEnableOption (lib.mdDoc "the dae service");
-      package = lib.mkPackageOptionMD pkgs "dae" { };
+    services.dae = with lib;{
+      enable = mkEnableOption
+        (mdDoc "A Linux high-performance transparent proxy solution based on eBPF");
+
+      package = mkPackageOptionMD pkgs "dae" { };
+
+      assets = mkOption {
+        type = with types;(listOf path);
+        default = with pkgs; [ v2ray-geoip v2ray-domain-list-community ];
+        defaultText = literalExpression "with pkgs; [ v2ray-geoip v2ray-domain-list-community ]";
+        description = mdDoc ''
+          Assets required to run dae.
+        '';
+      };
+
+      assetsPath = mkOption {
+        type = types.str;
+        default = "${genAssetsDrv assets}/share/v2ray";
+        defaultText = literalExpression ''
+          (symlinkJoin {
+              name = "dae-assets";
+              paths = assets;
+          })/share/v2ray
+        '';
+        description = mdDoc ''
+          The path which contains geolocation database.
+          This option will override `assets`.
+        '';
+      };
+
+      openFirewall = mkOption {
+        type = with types; submodule {
+          options = {
+            enable = mkEnableOption "enable";
+            port = mkOption {
+              type = types.int;
+              description = ''
+                Port to be opened. Consist with field `tproxy_port` in config file.
+              '';
+            };
+          };
+        };
+        default = {
+          enable = true;
+          port = 12345;
+        };
+        defaultText = literalExpression ''
+          {
+            enable = true;
+            port = 12345;
+          }
+        '';
+        description = mdDoc ''
+          Open the firewall port.
+        '';
+      };
+
+
+      config = mkOption {
+        type = types.str;
+        default = ''
+          global{}
+          routing{}
+        '';
+        description = mdDoc ''
+          Config text for dae.
+        '';
+      };
+
+      disableTxChecksumIpGeneric =
+        mkEnableOption (mdDoc "See https://github.com/daeuniverse/dae/issues/43");
+
     };
   };
 
-  config = lib.mkIf config.services.dae.enable {
-    networking.firewall.allowedTCPPorts = [ 12345 ];
-    networking.firewall.allowedUDPPorts = [ 12345 ];
+  config = lib.mkIf cfg.enable
 
-    systemd.services.dae = {
-      unitConfig = {
-        Description = "dae Service";
-        Documentation = "https://github.com/daeuniverse/dae";
-        After = [ "network-online.target" "systemd-sysctl.service" ];
-        Wants = [ "network-online.target" ];
+    {
+      environment.systemPackages = [ cfg.package ];
+      systemd.packages = [ cfg.package ];
+
+      environment.etc."dae/config.dae" = {
+        mode = "0400";
+        source = pkgs.writeText "config.dae" cfg.config;
       };
 
-      serviceConfig = {
-        User = "root";
-        ExecStartPre = "${lib.getExe cfg.package} validate -c /etc/dae/config.dae";
-        ExecStart = "${lib.getExe cfg.package} run --disable-timestamp -c /etc/dae/config.dae";
-        ExecReload = "${lib.getExe cfg.package} reload $MAINPID";
-        LimitNPROC = 512;
-        LimitNOFILE = 1048576;
-        Restart = "on-abnormal";
-        Type = "notify";
+      networking = lib.mkIf cfg.openFirewall.enable {
+        firewall =
+          let portToOpen = cfg.openFirewall.port;
+          in
+          {
+            allowedTCPPorts = [ portToOpen ];
+            allowedUDPPorts = [ portToOpen ];
+          };
       };
 
-      wantedBy = [ "multi-user.target" ];
+      systemd.services.dae =
+        let
+          daeBin = lib.getExe cfg.package;
+          TxChecksumIpGenericWorkaround = with lib;(getExe pkgs.writeShellApplication {
+            name = "disable-tx-checksum-ip-generic";
+            text = with pkgs; ''
+              iface=$(${iproute2}/bin/ip route | ${lib.getExe gawk} '/default/ {print $5}')
+              ${lib.getExe ethtool} -K "$iface" tx-checksum-ip-generic off
+            '';
+          });
+        in
+        {
+          wantedBy = [ "multi-user.target" ];
+          serviceConfig = {
+            ExecStartPre = [ "" "${daeBin} validate -c ${cfg.configFile}" ]
+              ++ (with lib; optional cfg.disableTxChecksumIpGeneric TxChecksumIpGenericWorkaround);
+            ExecStart = [ "" "${daeBin} run --disable-timestamp -c ${cfg.configFile}" ];
+            Environment = "DAE_LOCATION_ASSET=${cfg.assetsPath}";
+          };
+        };
+
+      assertions = [
+        {
+          assertion = lib.pathExists (toString (genAssetsDrv cfg.assets) + "/share/v2ray");
+          message = ''
+            Packages in `assets` has no preset paths included.
+            Please set `assetsPath` instead.
+          '';
+        }
+
+        {
+          assertion = !((config.services.dae.config != "global{}\nrouting{}\n")
+            && (config.services.dae.configFile != "/etc/dae/config.dae"));
+          message = ''
+            Option `config` and `configFile` could not be set
+            at the same time.
+          '';
+        }
+      ];
     };
-  };
 }