153 lines
3.5 KiB
Nix
153 lines
3.5 KiB
Nix
{ config, pkgs, ... }:
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with pkgs.lib;
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let
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cfg = config.services.bind;
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bindUser = "named";
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confFile = pkgs.writeText "named.conf"
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''
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acl cachenetworks { ${concatMapStrings (entry: " ${entry}; ") cfg.cacheNetworks} };
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acl badnetworks { ${concatMapStrings (entry: " ${entry}; ") cfg.blockedNetworks} };
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options {
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listen-on {any;};
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listen-on-v6 {any;};
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allow-query { cachenetworks; };
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blackhole { badnetworks; };
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forward first;
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forwarders { ${concatMapStrings (entry: " ${entry}; ") cfg.forwarders} };
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directory "/var/run/named";
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pid-file "/var/run/named/named.pid";
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};
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${ concatMapStrings
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({ name, file, master ? true, slaves ? [], masters ? [] }:
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''
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zone "${name}" {
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type ${if master then "master" else "slave"};
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file "${file}";
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${ if master then
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''
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allow-transfer {
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${concatMapStrings (ip: "${ip};\n") slaves}
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};
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''
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else
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''
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masters {
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${concatMapStrings (ip: "${ip};\n") masters}
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};
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''
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}
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allow-query { any; };
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};
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'')
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cfg.zones }
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'';
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in
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{
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###### interface
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options = {
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services.bind = {
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enable = mkOption {
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default = false;
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description = "
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Whether to enable BIND domain name server.
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";
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};
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cacheNetworks = mkOption {
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default = ["127.0.0.0/24"];
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description = "
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What networks are allowed to use us as a resolver.
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";
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};
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blockedNetworks = mkOption {
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default = [];
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description = "
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What networks are just blocked.
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";
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};
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ipv4Only = mkOption {
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default = false;
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description = "
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Only use ipv4, even if the host supports ipv6.
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";
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};
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forwarders = mkOption {
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default = config.networking.nameservers;
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description = "
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List of servers we should forward requests to.
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";
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};
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zones = mkOption {
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default = [];
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description = "
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List of zones we claim authority over.
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master=false means slave server; slaves means addresses
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who may request zone transfer.
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";
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example = [{
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name = "example.com";
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master = false;
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file = "/var/dns/example.com";
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masters = ["192.168.0.1"];
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slaves = [];
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}];
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};
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configFile = mkOption {
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default = confFile;
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description = "
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Overridable config file to use for named. By default, that
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generated by nixos.
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";
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};
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};
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};
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###### implementation
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config = mkIf config.services.bind.enable {
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users.extraUsers = singleton
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{ name = bindUser;
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uid = config.ids.uids.bind;
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description = "BIND daemon user";
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};
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jobs.bind =
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{ description = "BIND name server job";
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startOn = "started network-interfaces";
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preStart =
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''
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${pkgs.coreutils}/bin/mkdir -p /var/run/named
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chown ${bindUser} /var/run/named
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'';
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exec = "${pkgs.bind}/sbin/named -u ${bindUser} ${optionalString cfg.ipv4Only "-4"} -c ${cfg.configFile} -f";
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};
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};
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}
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