Merge pull request #186652 from peterhoeg/u/http-dns

nixos/https-dns-proxy: bump version and add support for OpenDNS

nixos/modules/services/networking/https-dns-proxy.nix

@@ -20,19 +20,23 @@ let
       ips = [ "9.9.9.9" "149.112.112.112" ];
       url = "https://dns.quad9.net/dns-query";
     };
+    opendns = {
+      ips = [ "208.67.222.222" "208.67.220.220" ];
+      url = "https://doh.opendns.com/dns-query";
+    };
+    custom = {
+      inherit (cfg.provider) ips url;
+    };
   };
 
   defaultProvider = "quad9";
 
   providerCfg =
-    let
-      isCustom = cfg.provider.kind == "custom";
-    in
-    lib.concatStringsSep " " [
+    concatStringsSep " " [
       "-b"
-      (concatStringsSep "," (if isCustom then cfg.provider.ips else providers."${cfg.provider.kind}".ips))
+      (concatStringsSep "," providers."${cfg.provider.kind}".ips)
       "-r"
-      (if isCustom then cfg.provider.url else providers."${cfg.provider.kind}".url)
+      providers."${cfg.provider.kind}".url
     ];
 
 in
@@ -62,14 +66,16 @@ in
           The upstream provider to use or custom in case you do not trust any of
           the predefined providers or just want to use your own.
 
-          The default is ${defaultProvider} and there are privacy and security trade-offs
-          when using any upstream provider. Please consider that before using any
-          of them.
+          The default is ${defaultProvider} and there are privacy and security
+          trade-offs when using any upstream provider. Please consider that
+          before using any of them.
 
-          If you pick a custom provider, you will need to provide the bootstrap
-          IP addresses as well as the resolver https URL.
+          Supported providers: ${concatStringsSep ", " (builtins.attrNames providers)}
+
+          If you pick the custom provider, you will need to provide the
+          bootstrap IP addresses as well as the resolver https URL.
         '';
-        type = types.enum ((builtins.attrNames providers) ++ [ "custom" ]);
+        type = types.enum (builtins.attrNames providers);
         default = defaultProvider;
       };
 
@@ -105,14 +111,18 @@ in
   config = lib.mkIf cfg.enable {
     systemd.services.https-dns-proxy = {
       description = "DNS to DNS over HTTPS (DoH) proxy";
+      requires = [ "network.target" ];
       after = [ "network.target" ];
+      wants = [ "nss-lookup.target" ];
+      before = [ "nss-lookup.target" ];
       wantedBy = [ "multi-user.target" ];
       serviceConfig = rec {
         Type = "exec";
         DynamicUser = true;
+        ProtectHome = "tmpfs";
         ExecStart = lib.concatStringsSep " " (
           [
-            "${pkgs.https-dns-proxy}/bin/https_dns_proxy"
+            (lib.getExe pkgs.https-dns-proxy)
             "-a ${toString cfg.address}"
             "-p ${toString cfg.port}"
             "-l -"

pkgs/servers/dns/https-dns-proxy/default.nix

@@ -1,24 +1,40 @@
 { lib, stdenv, fetchFromGitHub, cmake, gtest, c-ares, curl, libev }:
 
+let
+  # https-dns-proxy supports HTTP3 if curl has support, but as of 2022-08 curl doesn't work with that enabled
+  # curl' = (curl.override { http3Support = true; });
+  curl' = curl;
+
+in
 stdenv.mkDerivation rec {
   pname = "https-dns-proxy";
   # there are no stable releases (yet?)
-  version = "unstable-2021-03-29";
+  version = "unstable-2022-05-05";
 
   src = fetchFromGitHub {
     owner = "aarond10";
     repo = "https_dns_proxy";
-    rev = "bbd9ef272dcda3ead515871f594768af13192af7";
-    sha256 = "sha256-r+IpDklI3vITK8ZlZvIFm3JdDe2r8DK2ND3n1a/ThrM=";
+    rev = "d310a378795790350703673388821558163944de";
+    hash = "sha256-On4SKUeltPhzM/x+K9aKciKBw5lmVySxnmLi2tnKr3Y=";
   };
 
+  postPatch = ''
+    substituteInPlace https_dns_proxy.service.in \
+      --replace "\''${CMAKE_INSTALL_PREFIX}/" ""
+    substituteInPlace munin/https_dns_proxy.plugin \
+      --replace '--unit https_dns_proxy.service' '--unit https-dns-proxy.service'
+  '';
+
   nativeBuildInputs = [ cmake gtest ];
 
-  buildInputs = [ c-ares curl libev ];
+  buildInputs = [ c-ares curl' libev ];
 
-  installPhase = ''
-    install -Dm555 -t $out/bin https_dns_proxy
-    install -Dm444 -t $out/share/doc/${pname} ../{LICENSE,README}.*
+  postInstall = ''
+    install -Dm444 -t $out/share/doc/${pname} ../{LICENSE,*.md}
+    install -Dm444 -t $out/share/${pname}/munin ../munin/*
+    # the systemd service definition is garbage, and we use our own with NixOS
+    mv $out/lib/systemd $out/share/${pname}
+    rmdir $out/lib
   '';
 
   # upstream wants to add tests and the gtest framework is in place, so be ready
@@ -30,5 +46,6 @@ stdenv.mkDerivation rec {
     license = licenses.mit;
     maintainers = with maintainers; [ peterhoeg ];
     platforms = platforms.linux;
+    mainProgram = "https_dns_proxy";
   };
 }