Merge pull request #29450 from jerith666/djb-1709

Add modules for tinydns and dnscache from djbdns

2 files changed, 140 insertions, 0 deletions

diff --git a/nixos/modules/services/networking/dnscache.nix b/nixos/modules/services/networking/dnscache.nix
new file mode 100644
index 000000000000..f782be97f6fa
--- /dev/null
+++ b/nixos/modules/services/networking/dnscache.nix
@@ -0,0 +1,86 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.dnscache;
+
+  dnscache-root = pkgs.runCommand "dnscache-root" {} ''
+    mkdir -p $out/{servers,ip}
+
+    ${concatMapStrings (ip: ''
+      echo > "$out/ip/"${lib.escapeShellArg ip}
+    '') cfg.clientIps}
+
+    ${concatStrings (mapAttrsToList (host: ips: ''
+      ${concatMapStrings (ip: ''
+        echo ${lib.escapeShellArg ip} > "$out/servers/"${lib.escapeShellArg host}
+      '') ips}
+    '') cfg.domainServers)}
+
+    # djbdns contains an outdated list of root servers;
+    # if one was not provided in config, provide a current list
+    if [ ! -e servers/@ ]; then
+      awk '/^.?.ROOT-SERVERS.NET/ { print $4 }' ${pkgs.dns-root-data}/root.hints > $out/servers/@
+    fi
+  '';
+
+in {
+
+  ###### interface
+
+  options = {
+    services.dnscache = {
+      enable = mkOption {
+        default = false;
+        type = types.bool;
+        description = "Whether to run the dnscache caching dns server";
+      };
+
+      ip = mkOption {
+        default = "0.0.0.0";
+        type = types.str;
+        description = "IP address on which to listen for connections";
+      };
+
+      clientIps = mkOption {
+        default = [ "127.0.0.1" ];
+        type = types.listOf types.str;
+        description = "client IP addresses (or prefixes) from which to accept connections";
+        example = ["192.168" "172.23.75.82"];
+      };
+
+      domainServers = mkOption {
+        default = { };
+        type = types.attrsOf (types.listOf types.str);
+        description = "table of {hostname: server} pairs to use as authoritative servers for hosts (and subhosts)";
+        example = {
+          "example.com" = ["8.8.8.8" "8.8.4.4"];
+        };
+      };
+    };
+  };
+
+  ###### implementation
+
+  config = mkIf config.services.dnscache.enable {
+    environment.systemPackages = [ pkgs.djbdns ];
+    users.extraUsers.dnscache = {};
+
+    systemd.services.dnscache = {
+      description = "djbdns dnscache server";
+      wantedBy = [ "multi-user.target" ];
+      path = with pkgs; [ bash daemontools djbdns ];
+      preStart = ''
+        rm -rf /var/lib/dnscache
+        dnscache-conf dnscache dnscache /var/lib/dnscache ${config.services.dnscache.ip}
+        rm -rf /var/lib/dnscache/root
+        ln -sf ${dnscache-root} /var/lib/dnscache/root
+      '';
+      script = ''
+        cd /var/lib/dnscache/
+        exec ./run
+      '';
+    };
+  };
+}
diff --git a/nixos/modules/services/networking/tinydns.nix b/nixos/modules/services/networking/tinydns.nix
new file mode 100644
index 000000000000..184888ef05da
--- /dev/null
+++ b/nixos/modules/services/networking/tinydns.nix
@@ -0,0 +1,54 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+{
+  ###### interface
+
+  options = {
+    services.tinydns = {
+      enable = mkOption {
+        default = false;
+        type = types.bool;
+        description = "Whether to run the tinydns dns server";
+      };
+
+      data = mkOption {
+        type = types.lines;
+        default = "";
+        description = "The DNS data to serve, in the format described by tinydns-data(8)";
+      };
+
+      ip = mkOption {
+        default = "0.0.0.0";
+        type = types.str;
+        description = "IP address on which to listen for connections";
+      };
+    };
+  };
+
+  ###### implementation
+
+  config = mkIf config.services.tinydns.enable {
+    environment.systemPackages = [ pkgs.djbdns ];
+
+    users.extraUsers.tinydns = {};
+
+    systemd.services.tinydns = {
+      description = "djbdns tinydns server";
+      wantedBy = [ "multi-user.target" ];
+      path = with pkgs; [ daemontools djbdns ];
+      preStart = ''
+        rm -rf /var/lib/tinydns
+        tinydns-conf tinydns tinydns /var/lib/tinydns ${config.services.tinydns.ip}
+        cd /var/lib/tinydns/root/
+        ln -sf ${pkgs.writeText "tinydns-data" config.services.tinydns.data} data
+        tinydns-data
+      '';
+      script = ''
+        cd /var/lib/tinydns
+        exec ./run
+      '';
+    };
+  };
+}