From 3c79a42686239c84ab6531f21f51882e4c622732 Mon Sep 17 00:00:00 2001
From: Collin Williams <96917990+bluedragon1221@users.noreply.github.com>
Date: Tue, 30 Dec 2025 10:26:25 -0600
Subject: allow for configuring dhcp via networkd

---
 modules/services/nixos/networking/default.nix  |  5 ++-
 modules/services/nixos/networking/networkd.nix | 50 ++++++++++++++++++++++++++
 modules/services/nixos/networking/static.nix   | 40 ---------------------
 modules/services/options.nix                   | 33 +++++++++++------
 4 files changed, 77 insertions(+), 51 deletions(-)
 create mode 100644 modules/services/nixos/networking/networkd.nix
 delete mode 100644 modules/services/nixos/networking/static.nix

(limited to 'modules')

diff --git a/modules/services/nixos/networking/default.nix b/modules/services/nixos/networking/default.nix
index de573fe..076dc33 100644
--- a/modules/services/nixos/networking/default.nix
+++ b/modules/services/nixos/networking/default.nix
@@ -2,13 +2,16 @@
   imports = [
     ./iwd.nix
     ./networkmanager.nix
-    ./static.nix
+    ./networkd.nix
   ];
 
   # DNS
   services.resolved = {
     enable = true;
+    dnsovertls = "opportunistic";
     domains = [
+      "9.9.9.9#dns.quad9.net"
+      "149.112.112.112#dns.quad9.net"
       "1.1.1.1"
       "1.0.0.1"
     ];
diff --git a/modules/services/nixos/networking/networkd.nix b/modules/services/nixos/networking/networkd.nix
new file mode 100644
index 0000000..df14a08
--- /dev/null
+++ b/modules/services/nixos/networking/networkd.nix
@@ -0,0 +1,50 @@
+{
+  lib,
+  config,
+  ...
+}: let
+  cfg = config.collinux.services.networking.networkd;
+
+  dhcp_enabled = cfg.static == null;
+in
+  lib.mkIf cfg.enable {
+    networking = {
+      wireless = {
+        enable = true;
+        networks.${cfg.ssid}.pskRaw = "ext:psk";
+        secretsFile = cfg.pskFile;
+      };
+
+      # Disable default networking stuff
+      dhcpcd.enable = false;
+      useDHCP = false;
+      networkmanager.enable = false;
+    };
+
+    systemd.network = {
+      enable = true;
+      networks."10-static-lan" = {
+        name = "wl*";
+
+        networkConfig =
+          (
+            if dhcp_enabled
+            then {
+              DHCP = "yes";
+            }
+            else {
+              Address = cfg.static.ip;
+              Gateway = cfg.static.gateway;
+              # DNS is managed by systemd-resolvd
+              DHCP = "no";
+            }
+          )
+          // {
+            # diable ipv6 addresses
+            IPv6AcceptRA = "no";
+            IPv6PrivacyExtensions = "no";
+            LinkLocalAddressing = "no";
+          };
+      };
+    };
+  }
diff --git a/modules/services/nixos/networking/static.nix b/modules/services/nixos/networking/static.nix
deleted file mode 100644
index 9338a6a..0000000
--- a/modules/services/nixos/networking/static.nix
+++ /dev/null
@@ -1,40 +0,0 @@
-{
-  lib,
-  config,
-  ...
-}: let
-  cfg = config.collinux.services.networking.static;
-in
-  lib.mkIf cfg.enable {
-    networking = {
-      wireless = {
-        enable = true;
-        networks.${cfg.ssid}.pskRaw = "ext:psk";
-        secretsFile = config.age.secrets.${cfg.pskFile}.path;
-      };
-
-      # Disable default networking stuff
-      dhcpcd.enable = false;
-      useDHCP = false;
-      networkmanager.enable = false;
-    };
-
-    systemd.network = {
-      enable = true;
-      networks."10-static-lan" = {
-        name = "wl*";
-
-        networkConfig = {
-          Address = "${cfg.ip}/24";
-          Gateway = cfg.gateway;
-          DNS = "1.1.1.1";
-          DHCP = "no";
-
-          # diable ipv6 addresses
-          IPv6AcceptRA = "no";
-          IPv6PrivacyExtensions = "no";
-          LinkLocalAddressing = "no";
-        };
-      };
-    };
-  }
diff --git a/modules/services/options.nix b/modules/services/options.nix
index 78a5a8f..59b8e01 100644
--- a/modules/services/options.nix
+++ b/modules/services/options.nix
@@ -7,21 +7,29 @@
 in {
   options = {
     collinux.services = {
-      networking = {
+      networking = let
+        ip_addr = lib.types.strMatching "^((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\\.){3}(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])$";
+        ip_addr_cidr = lib.types.strMatching "^((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\\.){3}(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])/(3[0-2]|[12]?[0-9])$";
+      in {
         enable = mkEnableOption "wifi";
+
         iwd.enable = mkEnableOption "lightweight wifi daemon";
         networkmanager.enable = mkEnableOption "heavier wifi daemon";
 
-        static = let
-          ip_addr =
-            lib.types.strMatching
-            "^((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\\.){3}(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])$";
-        in {
+        networkd = {
           enable = mkEnableOption "set static IP (systemd-networkd)";
           ssid = mkOption {type = lib.types.str;};
-          ip = mkOption {type = ip_addr;};
-          gateway = mkOption {type = ip_addr;};
           pskFile = mkOption {type = lib.types.str;};
+
+          static = lib.mkOption {
+            type = lib.types.nullOr (lib.types.submodule {
+              options = {
+                ip = mkOption {type = ip_addr_cidr;};
+                gateway = mkOption {type = ip_addr;};
+              };
+            });
+            default = null;
+          };
         };
         tailscale.enable = mkEnableOption "tailscale";
         sshd.enable = mkEnableOption "OpenSSH server";
@@ -46,7 +54,12 @@ in {
           };
         };
         adguard.enable = mkEnableOption "AdGuardHome network-wide adblocking";
-        caddy.enable = mkEnableOption "caddy https server";
+        caddy = {
+          enable = mkEnableOption "caddy https server";
+          envFile = mkOption {
+            type = lib.types.str;
+          };
+        };
       };
     };
   };
@@ -54,7 +67,7 @@ in {
   config = {
     assertions = [
       {
-        assertion = with config.collinux.services.networking; (iwd.enable && !networkmanager.enable && !static.enable) || (!iwd.enable && networkmanager.enable && !static.enable) || (!iwd.enable && !networkmanager.enable && static.enable);
+        assertion = with config.collinux.services.networking; (iwd.enable && !networkmanager.enable && !networkd.enable) || (!iwd.enable && networkmanager.enable && !networkd.enable) || (!iwd.enable && !networkmanager.enable && networkd.enable);
         message = "only one networking method (iwd, networkmanager, static) can be active";
       }
     ];
-- 
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