1 files changed, 48 insertions, 0 deletions
diff --git a/nixos/modules/services/networking/rdnssd.nix b/nixos/modules/services/networking/rdnssd.nix
new file mode 100644
index 000000000000..f797206ad5c7
--- /dev/null
+++ b/nixos/modules/services/networking/rdnssd.nix
@@ -0,0 +1,48 @@
+# Module for rdnssd, a daemon that configures DNS servers in
+# /etc/resolv/conf from IPv6 RDNSS advertisements.
+
+{ config, pkgs, ... }:
+
+with pkgs.lib;
+
+{
+
+  ###### interface
+
+  options = {
+
+    services.rdnssd.enable = mkOption {
+      default = false;
+      #default = config.networking.enableIPv6;
+      description =
+        ''
+          Whether to enable the RDNSS daemon
+          (<command>rdnssd</command>), which configures DNS servers in
+          <filename>/etc/resolv.conf</filename> from RDNSS
+          advertisements sent by IPv6 routers.
+        '';
+    };
+
+  };
+
+
+  ###### implementation
+
+  config = mkIf config.services.rdnssd.enable {
+
+    jobs.rdnssd =
+      { description = "RDNSS daemon";
+
+        # Start before the network interfaces are brought up so that
+        # the daemon receives RDNSS advertisements from the kernel.
+        startOn = "starting network-interfaces";
+
+        # !!! Should write to /var/run/rdnssd/resolv.conf and run the daemon under another uid.
+        exec = "${pkgs.ndisc6}/sbin/rdnssd --resolv-file /etc/resolv.conf -u root";
+
+        daemonType = "fork";
+      };
+
+  };
+
+}