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nixpkgs/nixos/modules/services/networking/hostapd.nix
Eelco Dolstra 29027fd1e1 Rewrite ‘with pkgs.lib’ -> ‘with lib’
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.
2014-04-14 16:26:48 +02:00

164 lines
4.2 KiB
Nix

{ config, lib, pkgs, ... }:
# TODO:
#
# asserts
# ensure that the nl80211 module is loaded/compiled in the kernel
# hwMode must be a/b/g
# channel must be between 1 and 13 (maybe)
# wpa_supplicant and hostapd on the same wireless interface doesn't make any sense
# perhaps an assertion that there is a dhcp server and a dns server on the IP address serviced by the hostapd?
with lib;
let
cfg = config.services.hostapd;
configFile = pkgs.writeText "hostapd.conf"
''
interface=${cfg.interface}
driver=${cfg.driver}
ssid=${cfg.ssid}
hw_mode=${cfg.hwMode}
channel=${toString cfg.channel}
# logging (debug level)
logger_syslog=-1
logger_syslog_level=2
logger_stdout=-1
logger_stdout_level=2
ctrl_interface=/var/run/hostapd
ctrl_interface_group=${cfg.group}
${if cfg.wpa then ''
wpa=1
wpa_passphrase=${cfg.wpaPassphrase}
'' else ""}
${cfg.extraCfg}
'' ;
in
{
###### interface
options = {
services.hostapd = {
enable = mkOption {
default = false;
description = ''
Enable putting a wireless interface into infrastructure mode,
allowing other wireless devices to associate with the wireless interface and do
wireless networking. A simple access point will enable hostapd.wpa, and
hostapd.wpa_passphrase, hostapd.ssid, dhcpd on the wireless interface to
provide IP addresses to the associated stations, and nat (from the wireless
interface to an upstream interface).
'';
};
interface = mkOption {
default = "";
example = "wlan0";
description = ''
The interfaces <command>hostapd</command> will use.
'';
};
driver = mkOption {
default = "nl80211";
example = "hostapd";
type = types.string;
description = "Which driver hostapd will use. Most things will probably use the default.";
};
ssid = mkOption {
default = "nixos";
example = "mySpecialSSID";
type = types.string;
description = "SSID to be used in IEEE 802.11 management frames.";
};
hwMode = mkOption {
default = "b";
example = "g";
type = types.string;
description = "Operation mode (a = IEEE 802.11a, b = IEEE 802.11b, g = IEEE 802.11g";
};
channel = mkOption {
default = 7;
example = 11;
type = types.int;
description =
''
Channel number (IEEE 802.11)
Please note that some drivers do not use this value from hostapd and the
channel will need to be configured separately with iwconfig.
'';
};
group = mkOption {
default = "wheel";
example = "network";
type = types.string;
description = "members of this group can control hostapd";
};
wpa = mkOption {
default = true;
description = "enable WPA (IEEE 802.11i/D3.0) to authenticate to the access point";
};
wpaPassphrase = mkOption {
default = "my_sekret";
example = "any_64_char_string";
type = types.string;
description =
''
WPA-PSK (pre-shared-key) passphrase. Clients will need this
passphrase to associate with this access point. Warning: This passphrase will
get put into a world-readable file in the nix store.
'';
};
extraCfg = mkOption {
default = "";
example = ''
auth_algo=0
ieee80211n=1
ht_capab=[HT40-][SHORT-GI-40][DSSS_CCK-40]
'';
type = types.string;
description = "Extra configuration options to put in the hostapd.conf";
};
};
};
###### implementation
config = mkIf cfg.enable {
environment.systemPackages = [ pkgs.hostapd ];
systemd.services.hostapd =
{ description = "hostapd wireless AP";
path = [ pkgs.hostapd ];
wantedBy = [ "network.target" ];
after = [ "${cfg.interface}-cfg.service" "nat.service" "bind.service" "dhcpd.service"];
serviceConfig =
{ ExecStart = "${pkgs.hostapd}/bin/hostapd ${configFile}";
Restart = "always";
};
};
};
}