96 lines
		
	
	
		
			2.8 KiB
		
	
	
	
		
			Nix
		
	
	
	
	
	
			
		
		
	
	
			96 lines
		
	
	
		
			2.8 KiB
		
	
	
	
		
			Nix
		
	
	
	
	
	
{ config, lib, pkgs, ... }:
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with lib;
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let
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  cfg = config.services.knot;
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  configFile = pkgs.writeText "knot.conf" cfg.extraConfig;
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  socketFile = "/run/knot/knot.sock";
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  knotConfCheck = file: pkgs.runCommand "knot-config-checked"
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    { buildInputs = [ cfg.package ]; } ''
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    ln -s ${configFile} $out
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    knotc --config=${configFile} conf-check
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  '';
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  knot-cli-wrappers = pkgs.stdenv.mkDerivation {
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    name = "knot-cli-wrappers";
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    buildInputs = [ pkgs.makeWrapper ];
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    buildCommand = ''
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      mkdir -p $out/bin
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      makeWrapper ${cfg.package}/bin/knotc "$out/bin/knotc" \
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        --add-flags "--config=${configFile}" \
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        --add-flags "--socket=${socketFile}"
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      makeWrapper ${cfg.package}/bin/keymgr "$out/bin/keymgr" \
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        --add-flags "--config=${configFile}"
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      for executable in kdig khost kjournalprint knsec3hash knsupdate kzonecheck
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      do
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        ln -s "${cfg.package}/bin/$executable" "$out/bin/$executable"
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      done
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      mkdir -p "$out/share"
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      ln -s '${cfg.package}/share/man' "$out/share/"
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    '';
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  };
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in {
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  options = {
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    services.knot = {
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      enable = mkEnableOption "Knot authoritative-only DNS server";
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      extraArgs = mkOption {
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        type = types.listOf types.str;
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        default = [];
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        description = ''
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          List of additional command line paramters for knotd
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        '';
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      };
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      extraConfig = mkOption {
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        type = types.lines;
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        default = "";
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        description = ''
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          Extra lines to be added verbatim to knot.conf
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        '';
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      };
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      package = mkOption {
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        type = types.package;
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        default = pkgs.knot-dns;
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        description = ''
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          Which Knot DNS package to use
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        '';
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      };
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    };
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  };
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  config = mkIf config.services.knot.enable {
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    systemd.services.knot = {
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      unitConfig.Documentation = "man:knotd(8) man:knot.conf(5) man:knotc(8) https://www.knot-dns.cz/docs/${cfg.package.version}/html/";
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      description = cfg.package.meta.description;
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      wantedBy = [ "multi-user.target" ];
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      wants = [ "network.target" ];
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      after = ["network.target" ];
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      serviceConfig = {
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        Type = "notify";
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        ExecStart = "${cfg.package}/bin/knotd --config=${knotConfCheck configFile} --socket=${socketFile} ${concatStringsSep " " cfg.extraArgs}";
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        ExecReload = "${knot-cli-wrappers}/bin/knotc reload";
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        CapabilityBoundingSet = "CAP_NET_BIND_SERVICE CAP_SETPCAP";
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        AmbientCapabilities = "CAP_NET_BIND_SERVICE CAP_SETPCAP";
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        NoNewPrivileges = true;
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        DynamicUser = "yes";
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        RuntimeDirectory = "knot";
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        StateDirectory = "knot";
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        StateDirectoryMode = "0700";
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        PrivateDevices = true;
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        RestrictAddressFamilies = "AF_UNIX AF_INET AF_INET6";
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        SystemCallArchitectures = "native";
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        Restart = "on-abort";
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      };
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    };
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    environment.systemPackages = [ knot-cli-wrappers ];
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  };
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}
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