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add kresd service with basic options
Still celebrating today's 1.2.0 release! (cherry picked from commit 278bbe3)
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{ config, lib, pkgs, ... }: | ||
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with lib; | ||
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let | ||
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cfg = config.services.kresd; | ||
package = pkgs.knot-resolver; | ||
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configFile = pkgs.writeText "kresd.conf" cfg.extraConfig; | ||
in | ||
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{ | ||
meta.maintainers = [ maintainers.vcunat /* upstream developer */ ]; | ||
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###### 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 | ||
}; | ||
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###### implementation | ||
config = mkIf cfg.enable { | ||
environment.etc."kresd.conf".source = configFile; # not required | ||
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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; | ||
}; | ||
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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; | ||
}; | ||
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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 | ||
}; | ||
}; | ||
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# Create the cacheDir; tmpfiles don't work on nixos-rebuild switch. | ||
systemd.services.kresd-cachedir = { | ||
serviceConfig.Type = "oneshot"; | ||
script = '' | ||
if [ ! -d '${cfg.cacheDir}' ]; then | ||
mkdir -p '${cfg.cacheDir}' | ||
chown kresd:kresd '${cfg.cacheDir}' | ||
fi | ||
''; | ||
}; | ||
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systemd.services.kresd = { | ||
description = "Knot-resolver daemon"; | ||
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serviceConfig = { | ||
User = "kresd"; | ||
Type = "notify"; | ||
WorkingDirectory = cfg.cacheDir; | ||
}; | ||
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script = '' | ||
exec '${package}/bin/kresd' --config '${configFile}' \ | ||
-k '${cfg.cacheDir}/root.key' | ||
''; | ||
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after = [ "kresd-cachedir.service" ]; | ||
requires = [ "kresd.socket" "kresd-cachedir.service" ]; | ||
wantedBy = [ "sockets.target" ]; | ||
}; | ||
}; | ||
} |