mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-11-27 08:01:14 +00:00
91 lines
2.8 KiB
Nix
91 lines
2.8 KiB
Nix
# /etc files related to networking, such as /etc/services.
|
||
|
||
{ config, pkgs, ... }:
|
||
|
||
with pkgs.lib;
|
||
|
||
let
|
||
|
||
cfg = config.networking;
|
||
|
||
in
|
||
|
||
{
|
||
|
||
options = {
|
||
|
||
networking.extraHosts = pkgs.lib.mkOption {
|
||
type = types.lines;
|
||
default = "";
|
||
example = "192.168.0.1 lanlocalhost";
|
||
description = ''
|
||
Additional entries to be appended to <filename>/etc/hosts</filename>.
|
||
'';
|
||
};
|
||
|
||
networking.dnsSingleRequest = pkgs.lib.mkOption {
|
||
type = types.bool;
|
||
default = false;
|
||
description = ''
|
||
Recent versions of glibc will issue both ipv4 (A) and ipv6 (AAAA)
|
||
address queries at the same time, from the same port. Sometimes upstream
|
||
routers will systemically drop the ipv4 queries. The symptom of this problem is
|
||
that 'getent hosts example.com' only returns ipv6 (or perhaps only ipv4) addresses. The
|
||
workaround for this is to specify the option 'single-request' in
|
||
/etc/resolv.conf. This option enables that.
|
||
'';
|
||
};
|
||
|
||
};
|
||
|
||
config = {
|
||
|
||
environment.etc =
|
||
{ # /etc/services: TCP/UDP port assignments.
|
||
"services".source = pkgs.iana_etc + "/etc/services";
|
||
|
||
# /etc/protocols: IP protocol numbers.
|
||
"protocols".source = pkgs.iana_etc + "/etc/protocols";
|
||
|
||
# /etc/rpc: RPC program numbers.
|
||
"rpc".source = pkgs.glibc + "/etc/rpc";
|
||
|
||
# /etc/hosts: Hostname-to-IP mappings.
|
||
"hosts".text =
|
||
''
|
||
127.0.0.1 localhost
|
||
${optionalString cfg.enableIPv6 ''
|
||
::1 localhost
|
||
''}
|
||
${cfg.extraHosts}
|
||
'';
|
||
|
||
# /etc/resolvconf.conf: Configuration for openresolv.
|
||
"resolvconf.conf".text =
|
||
''
|
||
# This is the default, but we must set it here to prevent
|
||
# a collision with an apparently unrelated environment
|
||
# variable with the same name exported by dhcpcd.
|
||
interface_order='lo lo[0-9]*'
|
||
'' + optionalString config.services.nscd.enable ''
|
||
# Invalidate the nscd cache whenever resolv.conf is
|
||
# regenerated.
|
||
libc_restart='${pkgs.systemd}/bin/systemctl try-restart --no-block nscd.service'
|
||
'' + optionalString cfg.dnsSingleRequest ''
|
||
# only send one DNS request at a time
|
||
resolv_conf_options='single-request'
|
||
'' + optionalString config.services.bind.enable ''
|
||
# This hosts runs a full-blown DNS resolver.
|
||
name_servers='127.0.0.1'
|
||
'';
|
||
};
|
||
|
||
# The ‘ip-up’ target is started when we have IP connectivity. So
|
||
# services that depend on IP connectivity (like ntpd) should be
|
||
# pulled in by this target.
|
||
systemd.targets.ip-up.description = "Services Requiring IP Connectivity";
|
||
|
||
};
|
||
|
||
}
|