iodine service: add clients implimentation

- services.iodined moved to services.iodine
- configuration file backwards compatable
- old iodine server configuration moved to services.iodine.server
- attribute set services.iodine.clients added to specify any number
  of iodine clients
  - example:
    iodine.clients.home = { server = "iodinesubdomain.yourserver.com"; ... };
  - client services names iodine-name where name would be home

1 files changed, 136 insertions, 0 deletions

diff --git a/nixos/modules/services/networking/iodine.nix b/nixos/modules/services/networking/iodine.nix
new file mode 100644
index 00000000000..1b0d2d9a517
--- /dev/null
+++ b/nixos/modules/services/networking/iodine.nix
@@ -0,0 +1,136 @@
+# NixOS module for iodine, ip over dns daemon
+
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.iodine;
+
+  iodinedUser = "iodined";
+
+in
+{
+
+  ### configuration
+
+  options = {
+
+    services.iodine = {
+      clients = mkOption {
+        default = {};
+        description = ''
+          Each attribute of this option defines a systemd service that
+          runs iodine. Many or none may be defined.
+          The name of each service is
+          <literal>iodine-<replaceable>name</replaceable></literal>
+          where <replaceable>name</replaceable> is the name of the
+          corresponding attribute name.
+        '';
+        example = literalExample ''
+        {
+          foo = {
+            server = "tunnel.mdomain.com";
+            relay = "8.8.8.8";
+            extraConfig = "-P mysecurepassword";
+          }
+        }
+        '';
+        type = types.attrsOf (types.submodule (
+        {
+          options = {
+            server = mkOption {
+              type = types.str;
+              default = "";
+              description = "Domain or Subdomain of server running iodined";
+              example = "tunnel.mydomain.com";
+            };
+
+            relay = mkOption {
+              type = types.str;
+              default = "";
+              description = "DNS server to use as a intermediate relay to the iodined server";
+              example = "8.8.8.8";
+            };
+
+            extraConfig = mkOption {
+              type = types.str;
+              default = "";
+              description = "Additional command line parameters";
+              example = "-P mysecurepassword -l 192.168.1.10 -p 23";
+            };
+          };
+        }));
+      };
+
+      server = {
+        enable = mkOption {
+          type = types.bool;
+          default = false;
+          description = "enable iodined server";
+        };
+
+        ip = mkOption {
+          type = types.str;
+          default = "";
+          description = "The assigned ip address or ip range";
+          example = "172.16.10.1/24";
+        };
+
+        domain = mkOption {
+          type = types.str;
+          default = "";
+          description = "Domain or subdomain of which nameservers point to us";
+          example = "tunnel.mydomain.com";
+        };
+
+        extraConfig = mkOption {
+          type = types.str;
+          default = "";
+          description = "Additional command line parameters";
+          example = "-P mysecurepassword -l 192.168.1.10 -p 23";
+        };
+      };
+
+    };
+  };
+
+  ### implementation
+
+  config = mkIf (cfg.server.enable || cfg.clients != {}) {
+    environment.systemPackages = [ pkgs.iodine ];
+    boot.kernelModules = [ "tun" ];
+
+    systemd.services =
+    let
+      createIodineClientService = name: cfg:
+      {
+        description = "iodine client - ${name}";
+        wantedBy = [ "ip-up.target" ];
+        serviceConfig = {
+          RestartSec = "30s";
+          Restart = "always";
+          ExecStart = "${pkgs.iodine}/bin/iodine -f -u ${iodinedUser} ${cfg.extraConfig} ${cfg.relay} ${cfg.server}";
+        };
+      };
+    in
+    listToAttrs (
+      mapAttrsToList
+        (name: value: nameValuePair "iodine-${name}" (createIodineClientService name value))
+        cfg.clients
+    ) // {
+      iodined = mkIf (cfg.server.enable) {
+        description = "iodine, ip over dns server daemon";
+        wantedBy = [ "ip-up.target" ];
+        serviceConfig.ExecStart = "${pkgs.iodine}/bin/iodined -f -u ${iodinedUser} ${cfg.server.extraConfig} ${cfg.server.ip} ${cfg.server.domain}";
+      };
+    };
+
+    users.extraUsers = singleton {
+      name = iodinedUser;
+      uid = config.ids.uids.iodined;
+      description = "Iodine daemon user";
+    };
+    users.extraGroups.iodined.gid = config.ids.gids.iodined;
+  };
+}