160 lines
3.7 KiB
Nix
160 lines
3.7 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 interim;
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log-facility local1; # see dhcpd.nix
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${cfg.extraConfig}
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${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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type = types.lines;
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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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extraFlags = mkOption {
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default = "";
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example = "-6";
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description = "
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Additional command line flags to be passed to the dhcpd daemon.
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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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users = {
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extraUsers.dhcpd = {
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uid = config.ids.uids.dhcpd;
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description = "DHCP daemon user";
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};
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};
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systemd.services.dhcpd =
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{ description = "DHCP server";
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wantedBy = [ "multi-user.target" ];
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after = [ "network.target" ];
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path = [ pkgs.dhcp ];
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preStart =
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''
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mkdir -m 755 -p ${stateDir}
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touch ${stateDir}/dhcpd.leases
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mkdir -m 755 -p /run/dhcpd
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chown dhcpd /run/dhcpd
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'';
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serviceConfig =
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{ ExecStart = "@${pkgs.dhcp}/sbin/dhcpd dhcpd"
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+ " -pf /run/dhcpd/dhcpd.pid -cf ${configFile}"
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+ " -lf ${stateDir}/dhcpd.leases -user dhcpd -group nogroup"
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+ " ${cfg.extraFlags}"
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+ " ${toString cfg.interfaces}";
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Restart = "always";
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Type = "forking";
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PIDFile = "/run/dhcpd/dhcpd.pid";
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};
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};
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};
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}
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