pam_usb/src/hal.c

/*
 * Copyright (c) 2003-2006 Andrea Luzzardi <scox@sig11.org>
 *
 * This file is part of the pam_usb project. pam_usb is free software;
 * you can redistribute it and/or modify it under the terms of the GNU General
 * Public License version 2, as published by the Free Software Foundation.
 *
 * pam_usb is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY 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, write to the Free Software Foundation, Inc., 59 Temple
 * Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <string.h>
#include <stdarg.h>
#include <dbus/dbus.h>
#include <libhal-storage.h>
#include "log.h"

DBusConnection		*pusb_hal_dbus_connect(void)
{
  DBusConnection	*dbus = NULL;
  DBusError		error;

  dbus_error_init(&error);
  if (!(dbus = dbus_bus_get(DBUS_BUS_SYSTEM, &error)))
    {
      log_error("Cannot connect to system bus: %s\n",
		error.message);
      dbus_error_free(&error);
      return (NULL);
    }
  return (dbus);
}

void	pusb_hal_dbus_disconnect(DBusConnection *dbus)
{
  dbus_connection_close(dbus);
  dbus_connection_unref(dbus);
  dbus_shutdown();
}

LibHalContext	*pusb_hal_init(DBusConnection *dbus)
{
  DBusError	error;
  LibHalContext	*ctx = NULL;

  dbus_error_init(&error);
  if (!(ctx = libhal_ctx_new()))
    {
      log_error("Failed to create a HAL context\n");
      return (NULL);
    }
  if (!libhal_ctx_set_dbus_connection(ctx, dbus))
    {
      log_error("Failed to attach dbus connection to hal\n");
      libhal_ctx_free(ctx);
      return (NULL);
    }
  if (!libhal_ctx_init(ctx, &error))
    {
      log_error("libhal_ctx_init: %s\n", error.name, error.message);
      libhal_ctx_free(ctx);
      return (NULL);
    }
  return (ctx);
}

void	pusb_hal_destroy(LibHalContext *ctx)
{
  libhal_ctx_free(ctx);
}

char		*pusb_hal_get_property(LibHalContext *ctx,
				       const char *udi,
				       const char *name)
{
  DBusError	error;
  char		*data;

  dbus_error_init(&error);
  data = libhal_device_get_property_string(ctx, udi,
					   name, &error);
  if (!data)
    {
      log_debug("%s\n", error.message);
      dbus_error_free(&error);
      return (NULL);
    }
  return (data);
}

int	pusb_hal_check_property(LibHalContext *ctx,
				const char *udi,
				const char *name,
				const char *value)
{
  char	*data;
  int	retval;

  data = pusb_hal_get_property(ctx, udi, name);
  if (!data)
    return (0);
  retval = (strcmp(data, value) == 0);
  libhal_free_string(data);
  return (retval);
}

char		**pusb_hal_find_all_items(LibHalContext *ctx,
					  const char *property,
					  const char *value,
					  int *count)

{
  DBusError	error;
  char		**devices;
  int		n_devices;

  dbus_error_init(&error);
  *count = 0;
  devices = libhal_manager_find_device_string_match(ctx,
						    property,
						    value,
						    &n_devices,
						    &error);
  if (!devices)
    {
      log_error("Unable to find item \"%s\": %s\n", property,
		error.message);
      dbus_error_free(&error);
      return (NULL);
    }
  if (!n_devices)
    {
      libhal_free_string_array(devices);
      return (NULL);
    }
  *count = n_devices;
  return (devices);
}

char		*pusb_hal_find_item(LibHalContext *ctx,
				    const char *property,
				    const char *value,
				    ...)
{
  char		**devices;
  int		n_devices;
  char		*udi = NULL;
  va_list	ap;
  int		i;

  devices = pusb_hal_find_all_items(ctx, property, value, &n_devices);
  if (!devices)
    return (NULL);
  if (!n_devices)
    return (NULL);

  for (i = 0; i < n_devices; ++i)
    {
      char	*key = NULL;
      int	match = 1;

      va_start(ap, value);
      while ((key = va_arg(ap, char *)))
	{
	  char	*value = NULL;

	  value = va_arg(ap, char *);
	  if (!pusb_hal_check_property(ctx, devices[i],
				       key, value))
	    {
	      match = 0;
	      break;
	    }
	  match = 1;
	}
      if (match)
	{
	  udi = strdup(devices[i]);
	  break;
	}
      va_end(ap);
    }
  libhal_free_string_array(devices);
  return (udi);
}