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