112 lines
3.2 KiB
Nix
112 lines
3.2 KiB
Nix
{ config, lib, pkgs, ... }:
|
|
|
|
with lib;
|
|
|
|
let
|
|
cfg = config.services.dnscache;
|
|
|
|
dnscache-root = pkgs.runCommand "dnscache-root" { preferLocalBuild = true; } ''
|
|
mkdir -p $out/{servers,ip}
|
|
|
|
${concatMapStrings (ip: ''
|
|
touch "$out/ip/"${lib.escapeShellArg ip}
|
|
'') cfg.clientIps}
|
|
|
|
${concatStrings (mapAttrsToList (host: ips: ''
|
|
${concatMapStrings (ip: ''
|
|
echo ${lib.escapeShellArg ip} >> "$out/servers/"${lib.escapeShellArg host}
|
|
'') ips}
|
|
'') cfg.domainServers)}
|
|
|
|
# if a list of root servers was not provided in config, copy it
|
|
# over. (this is also done by dnscache-conf, but we 'rm -rf
|
|
# /var/lib/dnscache/root' below & replace it wholesale with this,
|
|
# so we have to ensure servers/@ exists ourselves.)
|
|
if [ ! -e $out/servers/@ ]; then
|
|
# symlink does not work here, due chroot
|
|
cp ${pkgs.djbdns}/etc/dnsroots.global $out/servers/@;
|
|
fi
|
|
'';
|
|
|
|
in {
|
|
|
|
###### interface
|
|
|
|
options = {
|
|
services.dnscache = {
|
|
|
|
enable = mkOption {
|
|
default = false;
|
|
type = types.bool;
|
|
description = "Whether to run the dnscache caching dns server.";
|
|
};
|
|
|
|
ip = mkOption {
|
|
default = "0.0.0.0";
|
|
type = types.str;
|
|
description = "IP address on which to listen for connections.";
|
|
};
|
|
|
|
clientIps = mkOption {
|
|
default = [ "127.0.0.1" ];
|
|
type = types.listOf types.str;
|
|
description = "Client IP addresses (or prefixes) from which to accept connections.";
|
|
example = ["192.168" "172.23.75.82"];
|
|
};
|
|
|
|
domainServers = mkOption {
|
|
default = { };
|
|
type = types.attrsOf (types.listOf types.str);
|
|
description = ''
|
|
Table of {hostname: server} pairs to use as authoritative servers for hosts (and subhosts).
|
|
If entry for @ is not specified predefined list of root servers is used.
|
|
'';
|
|
example = literalExpression ''
|
|
{
|
|
"@" = ["8.8.8.8" "8.8.4.4"];
|
|
"example.com" = ["192.168.100.100"];
|
|
}
|
|
'';
|
|
};
|
|
|
|
forwardOnly = mkOption {
|
|
default = false;
|
|
type = types.bool;
|
|
description = ''
|
|
Whether to treat root servers (for @) as caching
|
|
servers, requesting addresses the same way a client does. This is
|
|
needed if you want to use e.g. Google DNS as your upstream DNS.
|
|
'';
|
|
};
|
|
|
|
};
|
|
};
|
|
|
|
###### implementation
|
|
|
|
config = mkIf config.services.dnscache.enable {
|
|
environment.systemPackages = [ pkgs.djbdns ];
|
|
users.users.dnscache = {
|
|
isSystemUser = true;
|
|
group = "dnscache";
|
|
};
|
|
users.groups.dnscache = {};
|
|
|
|
systemd.services.dnscache = {
|
|
description = "djbdns dnscache server";
|
|
wantedBy = [ "multi-user.target" ];
|
|
path = with pkgs; [ bash daemontools djbdns ];
|
|
preStart = ''
|
|
rm -rf /var/lib/dnscache
|
|
dnscache-conf dnscache dnscache /var/lib/dnscache ${config.services.dnscache.ip}
|
|
rm -rf /var/lib/dnscache/root
|
|
ln -sf ${dnscache-root} /var/lib/dnscache/root
|
|
'';
|
|
script = ''
|
|
cd /var/lib/dnscache/
|
|
${optionalString cfg.forwardOnly "export FORWARDONLY=1"}
|
|
exec ./run
|
|
'';
|
|
};
|
|
};
|
|
}
|