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# /etc files related to networking, such as /etc/services.
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.networking;
localhostMapped4 = cfg.hosts ? "127.0.0.1" && elem "localhost" cfg.hosts."127.0.0.1";
localhostMapped6 = cfg.hosts ? "::1" && elem "localhost" cfg.hosts."::1";
localhostMultiple = any (elem "localhost") (attrValues (removeAttrs cfg.hosts [ "127.0.0.1" "::1" ]));
in
{
imports = [
(mkRemovedOptionModule [ "networking" "hostConf" ] "Use environment.etc.\"host.conf\" instead.")
];
options = {
networking.hosts = lib.mkOption {
type = types.attrsOf (types.listOf types.str);
example = literalExample ''
{
"127.0.0.1" = [ "foo.bar.baz" ];
"192.168.0.2" = [ "fileserver.local" "nameserver.local" ];
};
'';
description = ''
Locally defined maps of hostnames to IP addresses.
'';
};
networking.hostFiles = lib.mkOption {
type = types.listOf types.path;
defaultText = lib.literalExample "Hosts from `networking.hosts` and `networking.extraHosts`";
example = lib.literalExample ''[ "''${pkgs.my-blocklist-package}/share/my-blocklist/hosts" ]'';
description = ''
Files that should be concatenated together to form <filename>/etc/hosts</filename>.
'';
};
networking.extraHosts = lib.mkOption {
type = types.lines;
default = "";
example = "192.168.0.1 lanlocalhost";
description = ''
Additional verbatim entries to be appended to <filename>/etc/hosts</filename>.
For adding hosts from derivation results, use <option>networking.hostFiles</option> instead.
'';
};
networking.timeServers = mkOption {
default = [
"0.nixos.pool.ntp.org"
"1.nixos.pool.ntp.org"
"2.nixos.pool.ntp.org"
"3.nixos.pool.ntp.org"
];
description = ''
The set of NTP servers from which to synchronise.
'';
};
networking.proxy = {
default = lib.mkOption {
type = types.nullOr types.str;
default = null;
description = ''
This option specifies the default value for httpProxy, httpsProxy, ftpProxy and rsyncProxy.
'';
example = "http://127.0.0.1:3128";
};
httpProxy = lib.mkOption {
type = types.nullOr types.str;
default = cfg.proxy.default;
description = ''
This option specifies the http_proxy environment variable.
'';
example = "http://127.0.0.1:3128";
};
httpsProxy = lib.mkOption {
type = types.nullOr types.str;
default = cfg.proxy.default;
description = ''
This option specifies the https_proxy environment variable.
'';
example = "http://127.0.0.1:3128";
};
ftpProxy = lib.mkOption {
type = types.nullOr types.str;
default = cfg.proxy.default;
description = ''
This option specifies the ftp_proxy environment variable.
'';
example = "http://127.0.0.1:3128";
};
rsyncProxy = lib.mkOption {
type = types.nullOr types.str;
default = cfg.proxy.default;
description = ''
This option specifies the rsync_proxy environment variable.
'';
example = "http://127.0.0.1:3128";
};
allProxy = lib.mkOption {
type = types.nullOr types.str;
default = cfg.proxy.default;
description = ''
This option specifies the all_proxy environment variable.
'';
example = "http://127.0.0.1:3128";
};
noProxy = lib.mkOption {
type = types.nullOr types.str;
default = null;
description = ''
This option specifies the no_proxy environment variable.
If a default proxy is used and noProxy is null,
then noProxy will be set to 127.0.0.1,localhost.
'';
example = "127.0.0.1,localhost,.localdomain";
};
envVars = lib.mkOption {
type = types.attrs;
internal = true;
default = {};
description = ''
Environment variables used for the network proxy.
'';
};
};
};
config = {
assertions = [{
assertion = localhostMapped4;
message = ''`networking.hosts` doesn't map "127.0.0.1" to "localhost"'';
} {
assertion = !cfg.enableIPv6 || localhostMapped6;
message = ''`networking.hosts` doesn't map "::1" to "localhost"'';
} {
assertion = !localhostMultiple;
message = ''
`networking.hosts` maps "localhost" to something other than "127.0.0.1"
or "::1". This will break some applications. Please use
`networking.extraHosts` if you really want to add such a mapping.
'';
}];
networking.hosts = {
"127.0.0.1" = [ "localhost" ];
} // optionalAttrs (cfg.hostName != "") {
"127.0.1.1" = [ cfg.hostName ];
} // optionalAttrs cfg.enableIPv6 {
"::1" = [ "localhost" ];
};
networking.hostFiles = let
stringHosts =
let
oneToString = set: ip: ip + " " + concatStringsSep " " set.${ip} + "\n";
allToString = set: concatMapStrings (oneToString set) (attrNames set);
in pkgs.writeText "string-hosts" (allToString (filterAttrs (_: v: v != []) cfg.hosts));
extraHosts = pkgs.writeText "extra-hosts" cfg.extraHosts;
in mkBefore [ stringHosts extraHosts ];
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/hosts: Hostname-to-IP mappings.
hosts.source = pkgs.runCommandNoCC "hosts" {} ''
cat ${escapeShellArgs cfg.hostFiles} > $out
'';
# /etc/host.conf: resolver configuration file
"host.conf".text = ''
multi on
'';
} // optionalAttrs (pkgs.stdenv.hostPlatform.libc == "glibc") {
# /etc/rpc: RPC program numbers.
rpc.source = pkgs.glibc.out + "/etc/rpc";
};
networking.proxy.envVars =
optionalAttrs (cfg.proxy.default != null) {
# other options already fallback to proxy.default
no_proxy = "127.0.0.1,localhost";
} // optionalAttrs (cfg.proxy.httpProxy != null) {
http_proxy = cfg.proxy.httpProxy;
} // optionalAttrs (cfg.proxy.httpsProxy != null) {
https_proxy = cfg.proxy.httpsProxy;
} // optionalAttrs (cfg.proxy.rsyncProxy != null) {
rsync_proxy = cfg.proxy.rsyncProxy;
} // optionalAttrs (cfg.proxy.ftpProxy != null) {
ftp_proxy = cfg.proxy.ftpProxy;
} // optionalAttrs (cfg.proxy.allProxy != null) {
all_proxy = cfg.proxy.allProxy;
} // optionalAttrs (cfg.proxy.noProxy != null) {
no_proxy = cfg.proxy.noProxy;
};
# Install the proxy environment variables
environment.sessionVariables = cfg.proxy.envVars;
};
}
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