From 78b06757c29a0b662e9463a9b4a29162fae8ef65 Mon Sep 17 00:00:00 2001
From: Samuel Leathers <samuel.leathers@iohk.io>
Date: Sat, 17 Mar 2018 20:30:44 -0400
Subject: [PATCH 1/2] powerdns: adding disassembler as maintainer

---
 pkgs/servers/dns/powerdns/default.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/servers/dns/powerdns/default.nix b/pkgs/servers/dns/powerdns/default.nix
index cde2fe1a426c..4884cebc8158 100644
--- a/pkgs/servers/dns/powerdns/default.nix
+++ b/pkgs/servers/dns/powerdns/default.nix
@@ -47,6 +47,6 @@ stdenv.mkDerivation rec {
     platforms = platforms.linux;
     # cannot find postgresql libs on macos x
     license = licenses.gpl2;
-    maintainers = [ maintainers.mic92 ];
+    maintainers = with maintainers; [ mic92 disassembler ];
   };
 }

From f515ca67f5b363c2da4ac9fe2cdd9e4079203e70 Mon Sep 17 00:00:00 2001
From: Samuel Leathers <samuel.leathers@iohk.io>
Date: Sat, 17 Mar 2018 19:05:27 -0400
Subject: [PATCH 2/2] nixos/dnsdist: initial service

---
 nixos/modules/module-list.nix                 |  1 +
 nixos/modules/services/networking/dnsdist.nix | 61 +++++++++++++++++++
 2 files changed, 62 insertions(+)
 create mode 100644 nixos/modules/services/networking/dnsdist.nix

diff --git a/nixos/modules/module-list.nix b/nixos/modules/module-list.nix
index 505c5497d36d..4110fb6443ae 100644
--- a/nixos/modules/module-list.nix
+++ b/nixos/modules/module-list.nix
@@ -467,6 +467,7 @@
   ./services/networking/dnschain.nix
   ./services/networking/dnscrypt-proxy.nix
   ./services/networking/dnscrypt-wrapper.nix
+  ./services/networking/dnsdist.nix
   ./services/networking/dnsmasq.nix
   ./services/networking/ejabberd.nix
   ./services/networking/fakeroute.nix
diff --git a/nixos/modules/services/networking/dnsdist.nix b/nixos/modules/services/networking/dnsdist.nix
new file mode 100644
index 000000000000..12eee136e639
--- /dev/null
+++ b/nixos/modules/services/networking/dnsdist.nix
@@ -0,0 +1,61 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.dnsdist;
+  configFile = pkgs.writeText "dndist.conf" ''
+    setLocal('${cfg.listenAddress}:${toString cfg.listenPort}')
+    ${cfg.extraConfig}
+    '';
+in {
+  options = {
+    services.dnsdist = {
+      enable = mkEnableOption "dnsdist domain name server";
+
+      listenAddress = mkOption {
+        type = types.str;
+        description = "Listen IP Address";
+        default = "0.0.0.0";
+      };
+      listenPort = mkOption {
+        type = types.int;
+        description = "Listen port";
+        default = 53;
+      };
+
+      extraConfig = mkOption {
+        type = types.lines;
+        default = ''
+        '';
+        description = ''
+          Extra lines to be added verbatim to dnsdist.conf.
+        '';
+      };
+    };
+  };
+
+  config = mkIf config.services.dnsdist.enable {
+    systemd.services.dnsdist = {
+      description = "dnsdist load balancer";
+      wantedBy = [ "multi-user.target" ];
+      after = ["network.target"];
+
+      serviceConfig = {
+        Restart="on-failure";
+        RestartSec="1";
+        DynamicUser = true;
+        StartLimitInterval="0";
+        PrivateTmp=true;
+        PrivateDevices=true;
+        CapabilityBoundingSet="CAP_NET_BIND_SERVICE CAP_SETGID CAP_SETUID";
+        ExecStart = "${pkgs.dnsdist}/bin/dnsdist --supervised --disable-syslog --config ${configFile}";
+        ProtectSystem="full";
+        ProtectHome=true;
+        RestrictAddressFamilies="AF_UNIX AF_INET AF_INET6";
+        LimitNOFILE="16384";
+        TasksMax="8192";
+      };
+    };
+  };
+}