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