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01b90dce78
This is a refactor of how resolvconf is managed on NixOS. We split it into a separate service which is enabled internally depending on whether we want /etc/resolv.conf to be managed by it. Various services now take advantage of those configuration options. We also now use systemd instead of activation scripts to update resolv.conf. NetworkManager now uses the right option for rc-manager DNS automatically, so the configuration option shouldn't be exposed.
80 lines
1.9 KiB
Nix
80 lines
1.9 KiB
Nix
# Module for rdnssd, a daemon that configures DNS servers in
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# /etc/resolv/conf from IPv6 RDNSS advertisements.
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{ config, lib, pkgs, ... }:
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with lib;
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let
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mergeHook = pkgs.writeScript "rdnssd-merge-hook" ''
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#! ${pkgs.runtimeShell} -e
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${pkgs.openresolv}/bin/resolvconf -u
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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.rdnssd.enable = mkOption {
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default = false;
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#default = config.networking.enableIPv6;
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description =
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''
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Whether to enable the RDNSS daemon
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(<command>rdnssd</command>), which configures DNS servers in
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<filename>/etc/resolv.conf</filename> from RDNSS
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advertisements sent by IPv6 routers.
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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.rdnssd.enable {
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assertions = [{
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assertion = config.networking.resolvconf.enable;
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message = "rdnssd needs resolvconf to work (probably something sets up a static resolv.conf)";
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}];
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systemd.services.rdnssd = {
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description = "RDNSS daemon";
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after = [ "network.target" ];
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wantedBy = [ "multi-user.target" ];
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preStart = ''
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# Create the proper run directory
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mkdir -p /run/rdnssd
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touch /run/rdnssd/resolv.conf
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chown -R rdnssd /run/rdnssd
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# Link the resolvconf interfaces to rdnssd
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rm -f /run/resolvconf/interfaces/rdnssd
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ln -s /run/rdnssd/resolv.conf /run/resolvconf/interfaces/rdnssd
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${mergeHook}
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'';
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postStop = ''
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rm -f /run/resolvconf/interfaces/rdnssd
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${mergeHook}
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'';
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serviceConfig = {
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ExecStart = "@${pkgs.ndisc6}/bin/rdnssd rdnssd -p /run/rdnssd/rdnssd.pid -r /run/rdnssd/resolv.conf -u rdnssd -H ${mergeHook}";
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Type = "forking";
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PIDFile = "/run/rdnssd/rdnssd.pid";
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};
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};
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users.users.rdnssd = {
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description = "RDNSSD Daemon User";
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uid = config.ids.uids.rdnssd;
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};
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};
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}
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