276 lines
9 KiB
Nix
276 lines
9 KiB
Nix
# /etc files related to networking, such as /etc/services.
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{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.networking;
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dnsmasqResolve = config.services.dnsmasq.enable &&
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config.services.dnsmasq.resolveLocalQueries;
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hasLocalResolver = config.services.bind.enable || dnsmasqResolve;
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resolvconfOptions = cfg.resolvconfOptions
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++ optional cfg.dnsSingleRequest "single-request"
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++ optional cfg.dnsExtensionMechanism "edns0";
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in
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{
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options = {
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networking.extraHosts = lib.mkOption {
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type = types.lines;
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default = "";
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example = "192.168.0.1 lanlocalhost";
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description = ''
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Additional entries to be appended to <filename>/etc/hosts</filename>.
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'';
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};
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networking.hostConf = lib.mkOption {
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type = types.lines;
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default = "multi on";
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example = ''
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multi on
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reorder on
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trim lan
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'';
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description = ''
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The contents of <filename>/etc/host.conf</filename>. See also <citerefentry><refentrytitle>host.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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'';
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};
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networking.dnsSingleRequest = lib.mkOption {
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type = types.bool;
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default = false;
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description = ''
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Recent versions of glibc will issue both ipv4 (A) and ipv6 (AAAA)
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address queries at the same time, from the same port. Sometimes upstream
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routers will systemically drop the ipv4 queries. The symptom of this problem is
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that 'getent hosts example.com' only returns ipv6 (or perhaps only ipv4) addresses. The
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workaround for this is to specify the option 'single-request' in
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/etc/resolv.conf. This option enables that.
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'';
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};
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networking.dnsExtensionMechanism = lib.mkOption {
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type = types.bool;
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default = true;
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description = ''
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Enable the <code>edns0</code> option in <filename>resolv.conf</filename>. With
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that option set, <code>glibc</code> supports use of the extension mechanisms for
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DNS (EDNS) specified in RFC 2671. The most popular user of that feature is DNSSEC,
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which does not work without it.
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'';
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};
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networking.extraResolvconfConf = lib.mkOption {
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type = types.lines;
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default = "";
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example = "libc=NO";
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description = ''
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Extra configuration to append to <filename>resolvconf.conf</filename>.
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'';
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};
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networking.resolvconfOptions = lib.mkOption {
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type = types.listOf types.str;
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default = [];
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example = [ "ndots:1" "rotate" ];
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description = ''
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Set the options in <filename>/etc/resolv.conf</filename>.
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'';
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};
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networking.timeServers = mkOption {
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default = [
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"0.nixos.pool.ntp.org"
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"1.nixos.pool.ntp.org"
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"2.nixos.pool.ntp.org"
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"3.nixos.pool.ntp.org"
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];
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description = ''
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The set of NTP servers from which to synchronise.
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'';
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};
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networking.proxy = {
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default = lib.mkOption {
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type = types.nullOr types.str;
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default = null;
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description = ''
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This option specifies the default value for httpProxy, httpsProxy, ftpProxy and rsyncProxy.
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'';
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example = "http://127.0.0.1:3128";
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};
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httpProxy = lib.mkOption {
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type = types.nullOr types.str;
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default = cfg.proxy.default;
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description = ''
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This option specifies the http_proxy environment variable.
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'';
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example = "http://127.0.0.1:3128";
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};
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httpsProxy = lib.mkOption {
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type = types.nullOr types.str;
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default = cfg.proxy.default;
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description = ''
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This option specifies the https_proxy environment variable.
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'';
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example = "http://127.0.0.1:3128";
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};
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ftpProxy = lib.mkOption {
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type = types.nullOr types.str;
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default = cfg.proxy.default;
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description = ''
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This option specifies the ftp_proxy environment variable.
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'';
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example = "http://127.0.0.1:3128";
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};
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rsyncProxy = lib.mkOption {
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type = types.nullOr types.str;
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default = cfg.proxy.default;
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description = ''
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This option specifies the rsync_proxy environment variable.
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'';
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example = "http://127.0.0.1:3128";
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};
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allProxy = lib.mkOption {
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type = types.nullOr types.str;
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default = cfg.proxy.default;
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description = ''
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This option specifies the all_proxy environment variable.
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'';
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example = "http://127.0.0.1:3128";
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};
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noProxy = lib.mkOption {
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type = types.nullOr types.str;
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default = null;
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description = ''
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This option specifies the no_proxy environment variable.
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If a default proxy is used and noProxy is null,
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then noProxy will be set to 127.0.0.1,localhost.
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'';
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example = "127.0.0.1,localhost,.localdomain";
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};
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envVars = lib.mkOption {
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type = types.attrs;
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internal = true;
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default = {};
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description = ''
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Environment variables used for the network proxy.
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'';
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};
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};
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};
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config = {
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environment.etc =
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{ # /etc/services: TCP/UDP port assignments.
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"services".source = pkgs.iana-etc + "/etc/services";
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# /etc/protocols: IP protocol numbers.
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"protocols".source = pkgs.iana-etc + "/etc/protocols";
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# /etc/rpc: RPC program numbers.
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"rpc".source = pkgs.glibc.out + "/etc/rpc";
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# /etc/hosts: Hostname-to-IP mappings.
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"hosts".text =
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''
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127.0.0.1 localhost
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${optionalString cfg.enableIPv6 ''
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::1 localhost
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''}
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${cfg.extraHosts}
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'';
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# /etc/host.conf: resolver configuration file
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"host.conf".text = cfg.hostConf;
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# /etc/resolvconf.conf: Configuration for openresolv.
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"resolvconf.conf".text =
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''
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# This is the default, but we must set it here to prevent
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# a collision with an apparently unrelated environment
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# variable with the same name exported by dhcpcd.
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interface_order='lo lo[0-9]*'
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'' + optionalString config.services.nscd.enable ''
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# Invalidate the nscd cache whenever resolv.conf is
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# regenerated.
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libc_restart='${pkgs.systemd}/bin/systemctl try-restart --no-block nscd.service 2> /dev/null'
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'' + optionalString (length resolvconfOptions > 0) ''
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# Options as described in resolv.conf(5)
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resolv_conf_options='${concatStringsSep " " resolvconfOptions}'
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'' + optionalString hasLocalResolver ''
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# This hosts runs a full-blown DNS resolver.
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name_servers='127.0.0.1'
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'' + optionalString dnsmasqResolve ''
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dnsmasq_conf=/etc/dnsmasq-conf.conf
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dnsmasq_resolv=/etc/dnsmasq-resolv.conf
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'' + cfg.extraResolvconfConf + ''
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'';
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} // (optionalAttrs config.services.resolved.enable (
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if dnsmasqResolve then {
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"dnsmasq-resolv.conf".source = "/run/systemd/resolve/resolv.conf";
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} else {
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"resolv.conf".source = "/run/systemd/resolve/resolv.conf";
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}
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));
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networking.proxy.envVars =
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optionalAttrs (cfg.proxy.default != null) {
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# other options already fallback to proxy.default
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no_proxy = "127.0.0.1,localhost";
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} // optionalAttrs (cfg.proxy.httpProxy != null) {
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http_proxy = cfg.proxy.httpProxy;
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} // optionalAttrs (cfg.proxy.httpsProxy != null) {
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https_proxy = cfg.proxy.httpsProxy;
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} // optionalAttrs (cfg.proxy.rsyncProxy != null) {
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rsync_proxy = cfg.proxy.rsyncProxy;
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} // optionalAttrs (cfg.proxy.ftpProxy != null) {
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ftp_proxy = cfg.proxy.ftpProxy;
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} // optionalAttrs (cfg.proxy.allProxy != null) {
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all_proxy = cfg.proxy.allProxy;
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} // optionalAttrs (cfg.proxy.noProxy != null) {
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no_proxy = cfg.proxy.noProxy;
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};
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# Install the proxy environment variables
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environment.sessionVariables = cfg.proxy.envVars;
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# This is needed when /etc/resolv.conf is being overriden by networkd
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# and other configurations. If the file is destroyed by an environment
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# activation then it must be rebuilt so that applications which interface
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# with /etc/resolv.conf directly don't break.
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system.activationScripts.resolvconf = stringAfter [ "etc" "specialfs" "var" ]
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''
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# Systemd resolved controls its own resolv.conf
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rm -f /run/resolvconf/interfaces/systemd
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${optionalString config.services.resolved.enable ''
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rm -rf /run/resolvconf/interfaces
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mkdir -p /run/resolvconf/interfaces
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ln -s /run/systemd/resolve/resolv.conf /run/resolvconf/interfaces/systemd
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''}
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# Make sure resolv.conf is up to date if not managed by systemd
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${optionalString (!config.services.resolved.enable) ''
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${pkgs.openresolv}/bin/resolvconf -u
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''}
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'';
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};
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}
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