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{ config, lib, ... }: with lib; {
options.srv = {
static = mkOption {
type = types.nullOr (types.submodule {
options = {
ip = mkOption {
type = types.str;
example = "10.0.0.0";
};
prefixLength = mkOption {
type = types.ints.between 0 32;
default = 24;
example = 32;
};
interface = mkOption {
type = types.str;
example = "ens3";
};
};
});
default = null;
};
tld = mkOption {
type = types.nullOr types.str;
default = null;
example = "local";
};
slds = mkOption {
type = types.listOf types.str;
default = [];
};
sldsImport = mkOption {
type = types.listOf types.path;
default = [];
};
};
config = let
netinterfaces = config:
{
${config.srv.static.interface}.ipv4.addresses = [{
address = config.srv.static.ip;
prefixLength = config.srv.static.prefixLength;
}];
};
in {
networking = mkIf
(config.srv.static != null)
{
interfaces = netinterfaces config;
# Calculate the gateway using the given static ip and prefix
# We're assuming the gateway is the first (min) host on the network
defaultGateway.address =
let
# 192.168.0.100 -> [ "192" "168" "0" "100" ]
ipBytes = builtins.map
(x: lib.toInt x)
(lib.splitString "." config.srv.static.ip);
# 2 ^^ x
pow2 = x: if x == 0 then 1 else 2 * (pow2 (x - 1));
# 24 -> 0b11111111_11111111_11111111_00000000
mask = 4294967295 - ((pow2 (32 - config.srv.static.prefixLength)) - 1);
# 0b11111111_11111111_11111111_00000000 -> [ 255 255 255 0 ]
maskBytes = [
(builtins.bitAnd (mask / 16777216) 255)
(builtins.bitAnd (mask / 65536) 255)
(builtins.bitAnd (mask / 256) 255)
(builtins.bitAnd mask 255)
];
# ipBytes & maskBytes
networkIP = lib.zipListsWith lib.bitAnd ipBytes maskBytes;
# min possible host
gatewayIP = (lib.take 3 networkIP) ++ [ ((lib.last networkIP) + 1) ];
in
lib.mkDefault
(lib.concatMapStringsSep
"."
builtins.toString
gatewayIP);
};
virtualisation.vmVariant.networking.interfaces = mkIf
(config.srv.static != null)
(lib.mkVMOverride
(netinterfaces
(lib.recursiveUpdate
config
{ srv.static.interface = "eth0"; })));
services.dnsmasq.settings.address = mkMerge [
(mkIf
(config.srv.static != null && config.srv.tld != null)
(builtins.map
(sld: "/${sld}.${config.srv.tld}/${config.srv.static.ip}")
config.srv.slds))
(mkIf
(config.srv.sldsImport != [])
(let
importModule = mpath:
let
module = import mpath;
in
if builtins.isFunction module
then module { config = {}; lib = {}; pkgs = {}; }
else module;
importSLDs = mpath:
let
module = importModule mpath;
in
(module.srv.slds or []) ++
(builtins.foldl'
(acc: x:
acc ++ importSLDs x)
[]
(module.imports or []));
sldConfigs = builtins.map
(mpath:
let
# TODO: ugly and hard-coded, must be fixed some day
m = importModule mpath;
inherit (m.srv) tld;
inherit (m.srv.static) ip;
in
builtins.map
(sld: "/${sld}.${tld}/${ip}")
(importSLDs mpath))
config.srv.sldsImport;
in
lib.flatten sldConfigs))
];
};
}
|
