path: root/src/users-service.c

/*
A small wrapper utility to load indicators and put them as menu items
into the gnome-panel using it's applet interface.

Copyright 2009 Canonical Ltd.

Authors:
    Ted Gould <ted@canonical.com>
    Cody Russell <crussell@canonical.com>

This program is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License version 3, as published
by the Free Software Foundation.

This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranties of
MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR
PURPOSE.  See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along
with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <unistd.h>

#include <glib/gi18n.h>

#include <dbus/dbus-glib.h>
#include <dbus/dbus-glib-bindings.h>

#include <libdbusmenu-glib/server.h>
#include <libdbusmenu-glib/menuitem.h>

#include "dbus-shared-names.h"
#include "users-service-dbus.h"

#define GUEST_SESSION_LAUNCHER  "/usr/share/gdm/guest-session/guest-session-launch"
#define MINIMUM_USERS           1
#define MAXIMUM_USERS           7

typedef struct _ActivateData ActivateData;
struct _ActivateData
{
  UsersServiceDbus *service;
  UserData *user;
};

static DBusGConnection   *session_bus = NULL;
static DBusGConnection   *system_bus = NULL;
static DBusGProxy        *bus_proxy = NULL;
static DBusGProxy        *gdm_proxy = NULL;
static DbusmenuMenuitem  *root_menuitem = NULL;
static GMainLoop         *mainloop = NULL;
static UsersServiceDbus  *dbus_interface = NULL;

static gint   count;
static GList *users;

static gboolean
check_guest_session (void)
{
	if (geteuid() < 500) {
		/* System users shouldn't have guest account shown.  Mosly
		   this would be the case of the guest user itself. */
		return FALSE;
	}
	if (!g_file_test(GUEST_SESSION_LAUNCHER, G_FILE_TEST_IS_EXECUTABLE)) {
		/* It doesn't appear that the Guest session stuff is
		   installed.  So let's not use it then! */
		return FALSE;
	}

	return TRUE;
}

static void
activate_guest_session (DbusmenuMenuitem * mi, gpointer user_data)
{
	GError * error = NULL;
	if (!g_spawn_command_line_async(GUEST_SESSION_LAUNCHER, &error)) {
		g_warning("Unable to start guest session: %s", error->message);
		g_error_free(error);
	}

	return;
}

static gboolean
check_new_session (void)
{
	if (system_bus == NULL) {
		system_bus = dbus_g_bus_get(DBUS_BUS_SYSTEM, NULL);
	}

	if (system_bus == NULL) {
		return FALSE;
	}

	if (gdm_proxy == NULL) {
		gdm_proxy = dbus_g_proxy_new_for_name(system_bus,
		                                      "org.gnome.DisplayManager",
		                                      "/org/gnome/DisplayManager/LocalDisplayFactory",
		                                      "org.gnome.DisplayManager.LocalDisplayFactory");
	}

	if (gdm_proxy == NULL) {
		return FALSE;
	}

	return TRUE;
}

static void
activate_new_session (DbusmenuMenuitem * mi, gpointer user_data)
{
	GError * error = NULL;
	if (!g_spawn_command_line_async("gdmflexiserver --startnew", &error)) {
		g_warning("Unable to start guest session: %s", error->message);
		g_error_free(error);
	}

	return;
}

static void
activate_user_session (DbusmenuMenuitem *mi, gpointer user_data)
{
  UserData *user = (UserData *)user_data;
  UsersServiceDbus *service = user->service;

  g_print ("activating user session for %s\n", user->user_name);

  users_service_dbus_activate_user_session (service, user);
}

static void
remove_menu_item (DbusmenuMenuitem *root, gpointer user_data)
{
  DbusmenuMenuitem *child = (DbusmenuMenuitem *)user_data;

  dbusmenu_menuitem_child_delete (root, child);
}

static void
rebuild_items (DbusmenuMenuitem *root,
               UsersServiceDbus *service)
{
  DbusmenuMenuitem *mi = NULL;
  GList *u;
  UserData *user;

  dbusmenu_menuitem_foreach (root, remove_menu_item, NULL);

  if (check_guest_session ()) {
    mi = dbusmenu_menuitem_new ();
    dbusmenu_menuitem_property_set (mi, DBUSMENU_MENUITEM_PROP_LABEL, _("Guest Session"));
    dbusmenu_menuitem_child_append (root, mi);
    g_signal_connect (G_OBJECT (mi), DBUSMENU_MENUITEM_SIGNAL_ITEM_ACTIVATED, G_CALLBACK (activate_guest_session), NULL);
  }

  if (count > 1 && count < 7)
    {
      for (u = users; u != NULL; u = g_list_next (u))
        {
          user = u->data;

          user->service = service;

          mi = dbusmenu_menuitem_new ();
          dbusmenu_menuitem_property_set (mi, DBUSMENU_MENUITEM_PROP_LABEL, user->real_name);
          dbusmenu_menuitem_child_append (root, mi);
          g_signal_connect (G_OBJECT (mi), DBUSMENU_MENUITEM_SIGNAL_ITEM_ACTIVATED, G_CALLBACK (activate_user_session), user);
        }
    }

  if (check_new_session ()) {
    mi = dbusmenu_menuitem_new ();
    dbusmenu_menuitem_property_set (mi, DBUSMENU_MENUITEM_PROP_LABEL, _("New Session..."));
    dbusmenu_menuitem_child_append (root, mi);
    g_signal_connect (G_OBJECT (mi), DBUSMENU_MENUITEM_SIGNAL_ITEM_ACTIVATED, G_CALLBACK (activate_new_session), NULL);
  }
}

static void
create_items (DbusmenuMenuitem *root,
              UsersServiceDbus *service)
{
  g_return_if_fail (IS_USERS_SERVICE_DBUS (service));

  count = users_service_dbus_get_user_count (service);
  if (count > 1 && count < 7)
    {
      users = users_service_dbus_get_user_list (service);
    }

  rebuild_items (root, service);
}

static void
user_added (UsersServiceDbus *service,
            UserData         *user,
            gpointer          user_data)
{
  DbusmenuMenuitem *root = (DbusmenuMenuitem *)user_data;

  users = g_list_append (users, user);

  rebuild_items (root, service);
}

static void
user_removed (UsersServiceDbus *service,
              UserData         *user,
              gpointer          user_data)
{
  DbusmenuMenuitem *root = (DbusmenuMenuitem *)user_data;

  users = g_list_remove (users, user);

  rebuild_items (root, service);
}

int
main (int argc, char ** argv)
{
    g_type_init();

    session_bus = dbus_g_bus_get(DBUS_BUS_SESSION, NULL);
    bus_proxy = dbus_g_proxy_new_for_name (session_bus, DBUS_SERVICE_DBUS, DBUS_PATH_DBUS, DBUS_INTERFACE_DBUS);
    GError * error = NULL;
    guint nameret = 0;

    if (!org_freedesktop_DBus_request_name(bus_proxy, INDICATOR_USERS_DBUS_NAME, 0, &nameret, &error)) {
        g_error("Unable to call to request name");
        return 1;
    }

    if (nameret != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) {
        g_error("Unable to get name");
        return 1;
    }

    dbus_interface = g_object_new (USERS_SERVICE_DBUS_TYPE, NULL);

    root_menuitem = dbusmenu_menuitem_new ();
    g_debug ("Root ID: %d", dbusmenu_menuitem_get_id (root_menuitem));

    create_items (root_menuitem, dbus_interface);

    DbusmenuServer * server = dbusmenu_server_new(INDICATOR_USERS_DBUS_OBJECT);
    dbusmenu_server_set_root(server, root_menuitem);

    g_signal_connect (G_OBJECT (dbus_interface),
                      "user-added",
                      G_CALLBACK (user_added),
                      root_menuitem);
    g_signal_connect (G_OBJECT (dbus_interface),
                      "user-removed",
                      G_CALLBACK (user_removed),
                      root_menuitem);

    mainloop = g_main_loop_new(NULL, FALSE);
    g_main_loop_run(mainloop);

    return 0;
}