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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
*
* Copyright (C) 2007-2010 David Zeuthen <zeuthen@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include "config.h"
#include <glib/gi18n-lib.h>
#include <sys/types.h>
#include <pwd.h>
#include <grp.h>
#include <string.h>
#include <stdlib.h>
#include <glib/gstdio.h>
#include "udiskslogging.h"
#include "udiskslinuxloop.h"
#include "udiskslinuxblockobject.h"
#include "udisksdaemon.h"
#include "udiskscleanup.h"
#include "udisksdaemonutil.h"
/**
* SECTION:udiskslinuxloop
* @title: UDisksLinuxLoop
* @short_description: Linux implementation of #UDisksLoop
*
* This type provides an implementation of the #UDisksLoop
* interface on Linux.
*/
typedef struct _UDisksLinuxLoopClass UDisksLinuxLoopClass;
/**
* UDisksLinuxLoop:
*
* The #UDisksLinuxLoop structure contains only private data and should
* only be accessed using the provided API.
*/
struct _UDisksLinuxLoop
{
UDisksLoopSkeleton parent_instance;
};
struct _UDisksLinuxLoopClass
{
UDisksLoopSkeletonClass parent_class;
};
static void loop_iface_init (UDisksLoopIface *iface);
G_DEFINE_TYPE_WITH_CODE (UDisksLinuxLoop, udisks_linux_loop, UDISKS_TYPE_LOOP_SKELETON,
G_IMPLEMENT_INTERFACE (UDISKS_TYPE_LOOP, loop_iface_init));
/* ---------------------------------------------------------------------------------------------------- */
static void
udisks_linux_loop_init (UDisksLinuxLoop *loop)
{
g_dbus_interface_skeleton_set_flags (G_DBUS_INTERFACE_SKELETON (loop),
G_DBUS_INTERFACE_SKELETON_FLAGS_HANDLE_METHOD_INVOCATIONS_IN_THREAD);
}
static void
udisks_linux_loop_class_init (UDisksLinuxLoopClass *klass)
{
}
/**
* udisks_linux_loop_new:
*
* Creates a new #UDisksLinuxLoop instance.
*
* Returns: A new #UDisksLinuxLoop. Free with g_object_unref().
*/
UDisksLoop *
udisks_linux_loop_new (void)
{
return UDISKS_LOOP (g_object_new (UDISKS_TYPE_LINUX_LOOP,
NULL));
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* udisks_linux_loop_update:
* @loop: A #UDisksLinuxLoop.
* @object: The enclosing #UDisksLinuxBlockObject instance.
*
* Updates the interface.
*/
void
udisks_linux_loop_update (UDisksLinuxLoop *loop,
UDisksLinuxBlockObject *object)
{
GUdevDevice *device;
device = udisks_linux_block_object_get_device (object);
if (g_str_has_prefix (g_udev_device_get_name (device), "loop"))
{
gchar *filename;
gchar *backing_file;
GError *error;
filename = g_strconcat (g_udev_device_get_sysfs_path (device), "/loop/backing_file", NULL);
error = NULL;
if (!g_file_get_contents (filename,
&backing_file,
NULL,
&error))
{
/* ENOENT is not unexpected */
if (!(error->domain == G_FILE_ERROR && error->code == G_FILE_ERROR_NOENT))
{
udisks_warning ("Error loading %s: %s (%s, %d)",
filename,
error->message,
g_quark_to_string (error->domain),
error->code);
}
g_error_free (error);
udisks_loop_set_backing_file (UDISKS_LOOP (loop), "");
}
else
{
/* TODO: validate UTF-8 */
g_strstrip (backing_file);
udisks_loop_set_backing_file (UDISKS_LOOP (loop), backing_file);
g_free (backing_file);
}
g_free (filename);
}
else
{
udisks_loop_set_backing_file (UDISKS_LOOP (loop), "");
}
g_object_unref (device);
}
/* ---------------------------------------------------------------------------------------------------- */
/* runs in thread dedicated to handling @invocation */
static gboolean
handle_delete (UDisksLoop *loop,
GDBusMethodInvocation *invocation,
GVariant *options)
{
UDisksObject *object;
UDisksBlock *block;
UDisksDaemon *daemon;
UDisksCleanup *cleanup;
gchar *error_message;
gchar *escaped_device;
GError *error;
uid_t caller_uid;
uid_t setup_by_uid;
object = NULL;
daemon = NULL;
error_message = NULL;
escaped_device = NULL;
object = g_object_ref (UDISKS_OBJECT (g_dbus_interface_get_object (G_DBUS_INTERFACE (loop))));
block = udisks_object_peek_block (object);
daemon = udisks_linux_block_object_get_daemon (UDISKS_LINUX_BLOCK_OBJECT (object));
cleanup = udisks_daemon_get_cleanup (daemon);
error = NULL;
if (!udisks_daemon_util_get_caller_uid_sync (daemon, invocation, NULL, &caller_uid, &error))
{
g_dbus_method_invocation_return_gerror (invocation, error);
g_error_free (error);
goto out;
}
error = NULL;
if (!udisks_cleanup_has_loop (cleanup,
udisks_block_get_device (block),
&setup_by_uid,
&error))
{
if (error != NULL)
{
g_dbus_method_invocation_return_error (invocation,
UDISKS_ERROR,
UDISKS_ERROR_FAILED,
"Error when looking for entry `%s' in loop: %s (%s, %d)",
udisks_block_get_device (block),
error->message,
g_quark_to_string (error->domain),
error->code);
g_error_free (error);
goto out;
}
setup_by_uid = -1;
}
if (caller_uid != setup_by_uid)
{
if (!udisks_daemon_util_check_authorization_sync (daemon,
object,
"org.freedesktop.udisks2.loop-delete-others",
options,
N_("Authentication is required to delete the loop device $(udisks2.device)"),
invocation))
goto out;
}
escaped_device = g_strescape (udisks_block_get_device (block), NULL);
if (!udisks_cleanup_ignore_loop (cleanup, udisks_block_get_device (block)))
{
g_dbus_method_invocation_return_error (invocation,
UDISKS_ERROR,
UDISKS_ERROR_ALREADY_UNMOUNTING,
"Cannot delete %s as it's currently being deleted",
udisks_block_get_device (block));
goto out;
}
if (!udisks_daemon_launch_spawned_job_sync (daemon,
NULL, /* GCancellable */
0, /* uid_t run_as_uid */
0, /* uid_t run_as_euid */
NULL, /* gint *out_status */
&error_message,
NULL, /* input_string */
"losetup -d \"%s\"",
escaped_device))
{
udisks_cleanup_unignore_loop (cleanup, udisks_block_get_device (block));
g_dbus_method_invocation_return_error (invocation,
UDISKS_ERROR,
UDISKS_ERROR_FAILED,
"Error deleting %s: %s",
udisks_block_get_device (block),
error_message);
goto out;
}
if (setup_by_uid != -1)
{
error = NULL;
if (!udisks_cleanup_remove_loop (cleanup, udisks_block_get_device (block), &error))
{
if (error == NULL)
{
g_dbus_method_invocation_return_error (invocation,
UDISKS_ERROR,
UDISKS_ERROR_FAILED,
"Error removing entry for `%s' from loop file: Entry not found",
udisks_block_get_device (block));
}
else
{
g_dbus_method_invocation_return_error (invocation,
UDISKS_ERROR,
UDISKS_ERROR_FAILED,
"Error removing entry for `%s' from loop file: %s (%s, %d)",
udisks_block_get_device (block),
error->message,
g_quark_to_string (error->domain),
error->code);
g_error_free (error);
}
udisks_cleanup_unignore_loop (cleanup, udisks_block_get_device (block));
goto out;
}
udisks_cleanup_unignore_loop (cleanup, udisks_block_get_device (block));
}
udisks_notice ("Deleted loop device %s (was backed by %s)",
udisks_block_get_device (block),
udisks_loop_get_backing_file (loop));
udisks_loop_complete_delete (loop, invocation);
out:
g_free (escaped_device);
g_free (error_message);
g_object_unref (object);
return TRUE; /* returning TRUE means that we handled the method invocation */
}
/* ---------------------------------------------------------------------------------------------------- */
static void
loop_iface_init (UDisksLoopIface *iface)
{
iface->handle_delete = handle_delete;
}
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