nixpkgs-suyu/nixos/modules/services/networking/wpa_supplicant.nix

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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.networking.wireless;
configFile = if cfg.networks != {} then pkgs.writeText "wpa_supplicant.conf" ''
${optionalString cfg.userControlled.enable ''
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=${cfg.userControlled.group}
update_config=1''}
${concatStringsSep "\n" (mapAttrsToList (ssid: networkConfig: let
psk = if networkConfig.psk != null
then ''"${networkConfig.psk}"''
else networkConfig.pskRaw;
priority = networkConfig.priority;
in ''
network={
ssid="${ssid}"
${optionalString (psk != null) ''psk=${psk}''}
${optionalString (psk == null) ''key_mgmt=NONE''}
${optionalString (priority != null) ''priority=${toString priority}''}
}
'') cfg.networks)}
'' else "/etc/wpa_supplicant.conf";
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in {
options = {
networking.wireless = {
enable = mkEnableOption "wpa_supplicant";
interfaces = mkOption {
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type = types.listOf types.str;
default = [];
example = [ "wlan0" "wlan1" ];
description = ''
The interfaces <command>wpa_supplicant</command> will use. If empty, it will
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automatically use all wireless interfaces.
'';
};
driver = mkOption {
type = types.str;
default = "nl80211,wext";
description = "Force a specific wpa_supplicant driver.";
};
networks = mkOption {
type = types.attrsOf (types.submodule {
options = {
psk = mkOption {
type = types.nullOr types.str;
default = null;
description = ''
The network's pre-shared key in plaintext defaulting
to being a network without any authentication.
Be aware that these will be written to the nix store
in plaintext!
Mutually exclusive with <varname>pskRaw</varname>.
'';
};
pskRaw = mkOption {
type = types.nullOr types.str;
default = null;
description = ''
The network's pre-shared key in hex defaulting
to being a network without any authentication.
Mutually exclusive with <varname>psk</varname>.
'';
};
priority = mkOption {
type = types.nullOr types.int;
default = null;
description = ''
By default, all networks will get same priority group (0). If some of the
networks are more desirable, this field can be used to change the order in
which wpa_supplicant goes through the networks when selecting a BSS. The
priority groups will be iterated in decreasing priority (i.e., the larger the
priority value, the sooner the network is matched against the scan results).
Within each priority group, networks will be selected based on security
policy, signal strength, etc.
'';
};
};
});
description = ''
The network definitions to automatically connect to when
<command>wpa_supplicant</command> is running. If this
parameter is left empty wpa_supplicant will use
/etc/wpa_supplicant.conf as the configuration file.
'';
default = {};
example = literalExample ''
{ echelon = {
psk = "abcdefgh";
};
"free.wifi" = {};
}
'';
};
userControlled = {
enable = mkOption {
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type = types.bool;
default = false;
description = ''
Allow normal users to control wpa_supplicant through wpa_gui or wpa_cli.
This is useful for laptop users that switch networks a lot and don't want
to depend on a large package such as NetworkManager just to pick nearby
access points.
When using a declarative network specification you cannot persist any
settings via wpa_gui or wpa_cli.
'';
};
group = mkOption {
type = types.str;
default = "wheel";
example = "network";
description = "Members of this group can control wpa_supplicant.";
};
};
};
};
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config = mkIf cfg.enable {
assertions = flip mapAttrsToList cfg.networks (name: cfg: {
assertion = cfg.psk == null || cfg.pskRaw == null;
message = ''networking.wireless."${name}".psk and networking.wireless."${name}".pskRaw are mutually exclusive'';
});
environment.systemPackages = [ pkgs.wpa_supplicant ];
services.dbus.packages = [ pkgs.wpa_supplicant ];
# FIXME: start a separate wpa_supplicant instance per interface.
systemd.services.wpa_supplicant = let
ifaces = cfg.interfaces;
deviceUnit = interface: [ "sys-subsystem-net-devices-${interface}.device" ];
in {
description = "WPA Supplicant";
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after = lib.concatMap deviceUnit ifaces;
before = [ "network.target" ];
wants = [ "network.target" ];
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requires = lib.concatMap deviceUnit ifaces;
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wantedBy = [ "multi-user.target" ];
stopIfChanged = false;
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path = [ pkgs.wpa_supplicant ];
script = ''
${if ifaces == [] then ''
for i in $(cd /sys/class/net && echo *); do
DEVTYPE=
source /sys/class/net/$i/uevent
if [ "$DEVTYPE" = "wlan" -o -e /sys/class/net/$i/wireless ]; then
ifaces="$ifaces''${ifaces:+ -N} -i$i"
fi
done
'' else ''
ifaces="${concatStringsSep " -N " (map (i: "-i${i}") ifaces)}"
''}
exec wpa_supplicant -s -u -D${cfg.driver} -c ${configFile} $ifaces
'';
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};
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powerManagement.resumeCommands = ''
${config.systemd.package}/bin/systemctl try-restart wpa_supplicant
'';
# Restart wpa_supplicant when a wlan device appears or disappears.
services.udev.extraRules = ''
ACTION=="add|remove", SUBSYSTEM=="net", ENV{DEVTYPE}=="wlan", RUN+="${config.systemd.package}/bin/systemctl try-restart wpa_supplicant.service"
'';
};
meta.maintainers = with lib.maintainers; [ globin ];
}