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-rw-r--r--nixos/modules/services/networking/dnsmasq.nix130
1 files changed, 130 insertions, 0 deletions
diff --git a/nixos/modules/services/networking/dnsmasq.nix b/nixos/modules/services/networking/dnsmasq.nix
new file mode 100644
index 00000000000..59a3ca2f28e
--- /dev/null
+++ b/nixos/modules/services/networking/dnsmasq.nix
@@ -0,0 +1,130 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.dnsmasq;
+  dnsmasq = pkgs.dnsmasq;
+  stateDir = "/var/lib/dnsmasq";
+
+  dnsmasqConf = pkgs.writeText "dnsmasq.conf" ''
+    dhcp-leasefile=${stateDir}/dnsmasq.leases
+    ${optionalString cfg.resolveLocalQueries ''
+      conf-file=/etc/dnsmasq-conf.conf
+      resolv-file=/etc/dnsmasq-resolv.conf
+    ''}
+    ${flip concatMapStrings cfg.servers (server: ''
+      server=${server}
+    '')}
+    ${cfg.extraConfig}
+  '';
+
+in
+
+{
+
+  ###### interface
+
+  options = {
+
+    services.dnsmasq = {
+
+      enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = ''
+          Whether to run dnsmasq.
+        '';
+      };
+
+      resolveLocalQueries = mkOption {
+        type = types.bool;
+        default = true;
+        description = ''
+          Whether dnsmasq should resolve local queries (i.e. add 127.0.0.1 to
+          /etc/resolv.conf).
+        '';
+      };
+
+      servers = mkOption {
+        type = types.listOf types.str;
+        default = [];
+        example = [ "8.8.8.8" "8.8.4.4" ];
+        description = ''
+          The DNS servers which dnsmasq should query.
+        '';
+      };
+
+      alwaysKeepRunning = mkOption {
+        type = types.bool;
+        default = false;
+        description = ''
+          If enabled, systemd will always respawn dnsmasq even if shut down manually. The default, disabled, will only restart it on error.
+        '';
+      };
+
+      extraConfig = mkOption {
+        type = types.lines;
+        default = "";
+        description = ''
+          Extra configuration directives that should be added to
+          <literal>dnsmasq.conf</literal>.
+        '';
+      };
+
+    };
+
+  };
+
+
+  ###### implementation
+
+  config = mkIf cfg.enable {
+
+    networking.nameservers =
+      optional cfg.resolveLocalQueries "127.0.0.1";
+
+    services.dbus.packages = [ dnsmasq ];
+
+    users.users.dnsmasq = {
+      isSystemUser = true;
+      group = "dnsmasq";
+      description = "Dnsmasq daemon user";
+    };
+    users.groups.dnsmasq = {};
+
+    networking.resolvconf = mkIf cfg.resolveLocalQueries {
+      useLocalResolver = mkDefault true;
+
+      extraConfig = ''
+        dnsmasq_conf=/etc/dnsmasq-conf.conf
+        dnsmasq_resolv=/etc/dnsmasq-resolv.conf
+      '';
+    };
+
+    systemd.services.dnsmasq = {
+        description = "Dnsmasq Daemon";
+        after = [ "network.target" "systemd-resolved.service" ];
+        wantedBy = [ "multi-user.target" ];
+        path = [ dnsmasq ];
+        preStart = ''
+          mkdir -m 755 -p ${stateDir}
+          touch ${stateDir}/dnsmasq.leases
+          chown -R dnsmasq ${stateDir}
+          touch /etc/dnsmasq-{conf,resolv}.conf
+          dnsmasq --test
+        '';
+        serviceConfig = {
+          Type = "dbus";
+          BusName = "uk.org.thekelleys.dnsmasq";
+          ExecStart = "${dnsmasq}/bin/dnsmasq -k --enable-dbus --user=dnsmasq -C ${dnsmasqConf}";
+          ExecReload = "${pkgs.coreutils}/bin/kill -HUP $MAINPID";
+          PrivateTmp = true;
+          ProtectSystem = true;
+          ProtectHome = true;
+          Restart = if cfg.alwaysKeepRunning then "always" else "on-failure";
+        };
+        restartTriggers = [ config.environment.etc.hosts.source ];
+    };
+  };
+}