From 3f444a392d39de1894ce1382a7d1474d00d043da Mon Sep 17 00:00:00 2001
From: coolneng <akasroua@gmail.com>
Date: Wed, 14 Apr 2021 14:09:17 +0200
Subject: [PATCH] Deploy DNS server with ad-block and NAT loopback

---
 modules/networking.nix | 23 +++++++++++++++++++++++
 modules/periodic.nix   | 31 +++++++++++++++++++++++++++++--
 2 files changed, 52 insertions(+), 2 deletions(-)

diff --git a/modules/networking.nix b/modules/networking.nix
index e788ae4..3824f9e 100644
--- a/modules/networking.nix
+++ b/modules/networking.nix
@@ -51,11 +51,13 @@ in {
       5000 # Sybase
       80 # HTTP
       443 # HTTPS
+      53 # DNS
     ];
     allowedUDPPorts = [
       137 # Samba
       138 # Samba
       1194 # Wireguard
+      53 # DNS
     ];
     allowPing = true;
   };
@@ -130,4 +132,25 @@ in {
     '';
   };
 
+  # DNS server with adblock
+  services.dnsmasq = {
+    enable = true;
+    servers = [ "1.1.1.1" "8.8.8.8" ];
+    extraConfig = ''
+      domain-needed
+      bogus-priv
+      no-resolv
+
+      listen-address=127.0.0.1,10.0.1.3,10.9.0.1
+      bind-interfaces
+
+      cache-size=10000
+      local-ttl=300
+
+      conf-file=/var/lib/dnsmasq/dnsmasq.blacklist.txt
+
+      address=/coace.duckdns.org/10.0.1.3
+    '';
+  };
+
 }
diff --git a/modules/periodic.nix b/modules/periodic.nix
index 6b683f4..58bc27e 100644
--- a/modules/periodic.nix
+++ b/modules/periodic.nix
@@ -1,6 +1,10 @@
 { config, lib, pkgs, ... }:
 
-{
+let
+  stateDir = "/var/lib/dnsmasq";
+  blocklist = "${stateDir}/dnsmasq.blacklist.txt";
+
+in {
   # Pull changes from git repos
   systemd.user.services.git-pull = {
     description = "Pull git repositories";
@@ -14,7 +18,7 @@
     serviceConfig = { Type = "oneshot"; };
   };
 
-  systemd.user.timers.doom-upgrade = {
+  systemd.user.timers.git-pull = {
     description = "Daily code update";
     wantedBy = [ "default.target" ];
     timerConfig = {
@@ -30,4 +34,27 @@
     location = "/vault/backups/databases/nextcloud";
     startAt = "*-*-* 05:15:00";
   };
+
+  # Fetch hosts-blocklists daily
+  systemd.services.download-dns-blocklist = {
+    description = "Download hosts-blocklists";
+    wantedBy = [ "default.target" ];
+    path = with pkgs; [ curl ];
+    script =
+      "curl -L https://github.com/notracking/hosts-blocklists/raw/master/dnsmasq/dnsmasq.blacklist.txt -o ${blocklist}";
+    serviceConfig.Type = "oneshot";
+    postStop = ''
+      chown -R dnsmasq ${stateDir}
+      systemctl restart dnsmasq
+    '';
+  };
+
+  systemd.timers.download-dns-blocklist = {
+    description = "Daily download of hosts-blocklists";
+    wantedBy = [ "default.target" ];
+    timerConfig = {
+      OnCalendar = "02:00:00";
+      Unit = "download-dns-blocklist.service";
+    };
+  };
 }