1917e69b54
By default we only restart if the dnsmasq daemon fails but we introduce an option to always keep it running.
120 lines
3 KiB
Nix
120 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.dnsmasq;
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dnsmasq = pkgs.dnsmasq;
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stateDir = "/var/lib/dnsmasq";
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dnsmasqConf = pkgs.writeText "dnsmasq.conf" ''
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dhcp-leasefile=${stateDir}/dnsmasq.leases
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${optionalString cfg.resolveLocalQueries ''
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conf-file=/etc/dnsmasq-conf.conf
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resolv-file=/etc/dnsmasq-resolv.conf
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''}
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${flip concatMapStrings cfg.servers (server: ''
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server=${server}
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'')}
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${cfg.extraConfig}
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'';
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in
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{
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###### interface
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options = {
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services.dnsmasq = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to run dnsmasq.
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'';
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};
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resolveLocalQueries = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether dnsmasq should resolve local queries (i.e. add 127.0.0.1 to
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/etc/resolv.conf).
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'';
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};
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servers = mkOption {
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type = types.listOf types.str;
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default = [];
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example = [ "8.8.8.8" "8.8.4.4" ];
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description = ''
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The DNS servers which dnsmasq should query.
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'';
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};
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alwaysKeepRunning = mkOption {
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type = types.bool;
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default = false;
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description = ''
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If enabled, systemd will always respawn dnsmasq even if shut down manually. The default, disabled, will only restart it on error.
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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 configuration directives that should be added to
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<literal>dnsmasq.conf</literal>.
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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.dnsmasq.enable {
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networking.nameservers =
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optional cfg.resolveLocalQueries "127.0.0.1";
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services.dbus.packages = [ dnsmasq ];
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users.extraUsers = singleton {
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name = "dnsmasq";
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uid = config.ids.uids.dnsmasq;
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description = "Dnsmasq daemon user";
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};
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systemd.services.dnsmasq = {
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description = "Dnsmasq Daemon";
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after = [ "network.target" "systemd-resolved.service" ];
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wantedBy = [ "multi-user.target" ];
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path = [ dnsmasq ];
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preStart = ''
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mkdir -m 755 -p ${stateDir}
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touch ${stateDir}/dnsmasq.leases
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chown -R dnsmasq ${stateDir}
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touch /etc/dnsmasq-{conf,resolv}.conf
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dnsmasq --test
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'';
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serviceConfig = {
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Type = "dbus";
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BusName = "uk.org.thekelleys.dnsmasq";
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ExecStart = "${dnsmasq}/bin/dnsmasq -k --enable-dbus --user=dnsmasq -C ${dnsmasqConf}";
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ExecReload = "${pkgs.coreutils}/bin/kill -HUP $MAINPID";
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PrivateTmp = true;
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ProtectSystem = true;
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ProtectHome = true;
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Restart = if cfg.alwaysKeepRunning then "always" else "on-failure";
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};
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restartTriggers = [ config.environment.etc.hosts.source ];
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};
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};
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}
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