29027fd1e1
Using pkgs.lib on the spine of module evaluation is problematic because the pkgs argument depends on the result of module evaluation. To prevent an infinite recursion, pkgs and some of the modules are evaluated twice, which is inefficient. Using ‘with lib’ prevents this problem.
132 lines
3.0 KiB
Nix
132 lines
3.0 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.dhcpd;
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stateDir = "/var/lib/dhcp"; # Don't use /var/state/dhcp; not FHS-compliant.
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configFile = if cfg.configFile != null then cfg.configFile else pkgs.writeText "dhcpd.conf"
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''
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default-lease-time 600;
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max-lease-time 7200;
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authoritative;
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ddns-update-style ad-hoc;
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log-facility local1; # see dhcpd.nix
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${cfg.extraConfig}
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${pkgs.lib.concatMapStrings
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(machine: ''
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host ${machine.hostName} {
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hardware ethernet ${machine.ethernetAddress};
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fixed-address ${machine.ipAddress};
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}
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'')
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cfg.machines
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}
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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.dhcpd = {
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enable = mkOption {
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default = false;
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description = "
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Whether to enable the DHCP server.
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";
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};
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extraConfig = mkOption {
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default = "";
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example = ''
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option subnet-mask 255.255.255.0;
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option broadcast-address 192.168.1.255;
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option routers 192.168.1.5;
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option domain-name-servers 130.161.158.4, 130.161.33.17, 130.161.180.1;
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option domain-name "example.org";
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subnet 192.168.1.0 netmask 255.255.255.0 {
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range 192.168.1.100 192.168.1.200;
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}
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'';
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description = "
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Extra text to be appended to the DHCP server configuration
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file. Currently, you almost certainly need to specify
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something here, such as the options specifying the subnet
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mask, DNS servers, etc.
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";
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};
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configFile = mkOption {
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default = null;
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description = "
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The path of the DHCP server configuration file. If no file
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is specified, a file is generated using the other options.
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";
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};
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interfaces = mkOption {
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default = ["eth0"];
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description = "
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The interfaces on which the DHCP server should listen.
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";
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};
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machines = mkOption {
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default = [];
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example = [
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{ hostName = "foo";
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ethernetAddress = "00:16:76:9a:32:1d";
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ipAddress = "192.168.1.10";
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}
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{ hostName = "bar";
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ethernetAddress = "00:19:d1:1d:c4:9a";
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ipAddress = "192.168.1.11";
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}
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];
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description = "
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A list mapping ethernet addresses to IP addresses for the
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DHCP server.
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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.dhcpd.enable {
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jobs.dhcpd =
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{ description = "DHCP server";
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startOn = "started network-interfaces";
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stopOn = "stopping network-interfaces";
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script =
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''
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mkdir -m 755 -p ${stateDir}
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touch ${stateDir}/dhcpd.leases
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exec ${pkgs.dhcp}/sbin/dhcpd -f -cf ${configFile} \
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-lf ${stateDir}/dhcpd.leases \
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${toString cfg.interfaces}
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'';
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};
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};
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}
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