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142 lines
3.4 KiB
Nix
142 lines
3.4 KiB
Nix
# Avahi daemon.
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{ config, pkgs, ... }:
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with pkgs.lib;
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let
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cfg = config.services.avahi;
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inherit (pkgs) avahi;
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avahiDaemonConf = with cfg; pkgs.writeText "avahi-daemon.conf" ''
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[server]
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host-name=${hostName}
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browse-domains=${concatStringsSep ", " browseDomains}
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use-ipv4=${if ipv4 then "yes" else "no"}
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use-ipv6=${if ipv6 then "yes" else "no"}
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[wide-area]
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enable-wide-area=${if wideArea then "yes" else "no"}
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[publish]
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disable-publishing=${if publishing then "no" else "yes"}
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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.avahi = {
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enable = mkOption {
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default = false;
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description = ''
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Whether to run the Avahi daemon, which allows Avahi clients
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to use Avahi's service discovery facilities and also allows
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the local machine to advertise its presence and services
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(through the mDNS responder implemented by `avahi-daemon').
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'';
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};
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hostName = mkOption {
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default = config.networking.hostName;
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description = ''Host name advertised on the LAN.'';
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};
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browseDomains = mkOption {
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default = [ "0pointer.de" "zeroconf.org" ];
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description = ''
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List of non-local DNS domains to be browsed.
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'';
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};
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ipv4 = mkOption {
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default = true;
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description = ''Whether to use IPv4'';
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};
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ipv6 = mkOption {
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default = false;
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description = ''Whether to use IPv6'';
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};
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wideArea = mkOption {
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default = true;
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description = ''Whether to enable wide-area service discovery.'';
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};
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publishing = mkOption {
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default = true;
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description = ''Whether to allow publishing.'';
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};
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nssmdns = mkOption {
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default = false;
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description = ''
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Whether to enable the mDNS NSS (Name Service Switch) plug-in.
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Enabling it allows applications to resolve names in the `.local'
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domain by transparently querying the Avahi daemon.
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Warning: Currently, enabling this option breaks DNS lookups after
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a `nixos-rebuild'. This is because `/etc/nsswitch.conf' is
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updated to use `nss-mdns' but `libnss_mdns' is not in
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applications' `LD_LIBRARY_PATH'. The next time `/etc/profile' is
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sourced, it will set up an appropriate `LD_LIBRARY_PATH', though.
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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 cfg.enable {
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users.extraUsers = singleton
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{ name = "avahi";
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uid = config.ids.uids.avahi;
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description = "`avahi-daemon' privilege separation user";
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home = "/var/empty";
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};
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users.extraGroups = singleton
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{ name = "avahi";
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gid = config.ids.gids.avahi;
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};
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system.nssModules = optional cfg.nssmdns pkgs.nssmdns;
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environment.systemPackages = [ avahi ];
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jobs.avahi_daemon =
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{ name = "avahi-daemon";
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startOn = "ip-up";
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stopOn = "ip-down";
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script =
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''
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export PATH="${avahi}/bin:${avahi}/sbin:$PATH"
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# Make NSS modules visible so that `avahi_nss_support ()' can
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# return a sensible value.
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export LD_LIBRARY_PATH="${config.system.nssModules.path}"
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exec ${avahi}/sbin/avahi-daemon --daemonize -f "${avahiDaemonConf}"
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'';
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};
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services.dbus.enable = true;
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services.dbus.packages = [avahi];
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};
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}
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