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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.kresd;
package = pkgs.knot-resolver;
configFile = pkgs.writeText "kresd.conf" cfg.extraConfig;
in
{
meta.maintainers = [ maintainers.vcunat /* upstream developer */ ];
###### interface
options.services.kresd = {
enable = mkOption {
type = types.bool;
default = false;
description = ''
Whether to enable knot-resolver domain name server.
DNSSEC validation is turned on by default.
You can run <literal>sudo nc -U /run/kresd/control</literal>
and give commands interactively to kresd.
'';
};
extraConfig = mkOption {
type = types.lines;
default = "";
description = ''
Extra lines to be added verbatim to the generated configuration file.
'';
};
cacheDir = mkOption {
type = types.path;
default = "/var/cache/kresd";
description = ''
Directory for caches. They are intended to survive reboots.
'';
};
interfaces = mkOption {
type = with types; listOf str;
default = [ "::1" "127.0.0.1" ];
description = ''
What addresses the server should listen on.
'';
};
# TODO: perhaps options for more common stuff like cache size or forwarding
};
###### implementation
config = mkIf cfg.enable {
environment.etc."kresd.conf".source = configFile; # not required
users.extraUsers = singleton
{ name = "kresd";
uid = config.ids.uids.kresd;
group = "kresd";
description = "Knot-resolver daemon user";
};
users.extraGroups = singleton
{ name = "kresd";
gid = config.ids.gids.kresd;
};
systemd.sockets.kresd = rec {
wantedBy = [ "sockets.target" ];
before = wantedBy;
listenStreams = map
# Syntax depends on being IPv6 or IPv4.
(iface: if elem ":" (stringToCharacters iface) then "[${iface}]:53" else "${iface}:53")
cfg.interfaces;
socketConfig.ListenDatagram = listenStreams;
socketConfig.FreeBind = true;
};
systemd.sockets.kresd-control = rec {
wantedBy = [ "sockets.target" ];
before = wantedBy;
partOf = [ "kresd.socket" ];
listenStreams = [ "/run/kresd/control" ];
socketConfig = {
FileDescriptorName = "control";
Service = "kresd.service";
SocketMode = "0660"; # only root user/group may connect and control kresd
};
};
systemd.tmpfiles.rules = [ "d '${cfg.cacheDir}' 0770 kresd kresd - -" ];
systemd.services.kresd = {
description = "Knot-resolver daemon";
serviceConfig = {
User = "kresd";
Type = "notify";
WorkingDirectory = cfg.cacheDir;
Restart = "on-failure";
};
script = ''
exec '${package}/bin/kresd' --config '${configFile}' \
-k '${pkgs.dns-root-data}/root.key'
'';
requires = [ "kresd.socket" ];
};
};
}
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