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/* libguestfs - the guestfsd daemon
* Copyright (C) 2009-2020 Red Hat Inc.
*
* 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef GUESTFSD_STUBS_MACROS_H
#define GUESTFSD_STUBS_MACROS_H
/* Some macros to make resolving devices easier. These used to
* be available in daemon.h but now they are only used by stubs.
*/
/* All functions that need an argument that is a device or partition name
* must call this macro. It checks that the device exists and does
* device name translation (described in the guestfs(3) manpage).
* Note that the "path" argument may be modified.
*/
#define RESOLVE_DEVICE(path,path_out,is_filein) \
do { \
(path_out) = device_name_translation ((path)); \
if ((path_out) == NULL) { \
const int err = errno; \
if (is_filein) cancel_receive (); \
errno = err; \
reply_with_perror ("%s: %s", __func__, path); \
return; \
} \
if (!is_device_parameter ((path_out))) { \
if (is_filein) cancel_receive (); \
reply_with_error ("%s: %s: expecting a device name", __func__, (path)); \
return; \
} \
} while (0)
/* All functions that take a mountable argument must call this macro.
* It parses the mountable into a mountable_t, ensures any
* underlying device exists, and does device name translation
* (described in the guestfs(3) manpage).
*
* Note that the "string" argument may be modified.
*/
#define RESOLVE_MOUNTABLE(string,mountable,is_filein) \
do { \
if (STRPREFIX ((string), "btrfsvol:")) { \
if (parse_btrfsvol ((string) + strlen ("btrfsvol:"), &(mountable)) == -1)\
{ \
if (is_filein) cancel_receive (); \
reply_with_error ("%s: %s: expecting a btrfs volume", \
__func__, (string)); \
return; \
} \
} \
else { \
(mountable).type = MOUNTABLE_DEVICE; \
(mountable).device = NULL; \
(mountable).volume = NULL; \
RESOLVE_DEVICE ((string), (mountable).device, (is_filein)); \
} \
} while (0)
/* Helper for functions which need either an absolute path in the
* mounted filesystem, OR a /dev/ device which exists.
*
* NB: Functions which mix filenames and device paths should be
* avoided, and existing functions should be deprecated. This is
* because we intend in future to make device parameters a distinct
* type from filenames.
*/
#define REQUIRE_ROOT_OR_RESOLVE_DEVICE(path,path_out,is_filein) \
do { \
if (is_device_parameter ((path))) \
RESOLVE_DEVICE ((path), (path_out), (is_filein)); \
else { \
NEED_ROOT ((is_filein), return); \
ABS_PATH ((path), (is_filein), return); \
(path_out) = strdup ((path)); \
if ((path_out) == NULL) { \
if (is_filein) cancel_receive (); \
reply_with_perror ("strdup"); \
return; \
} \
} \
} while (0)
/* Helper for functions which need either an absolute path in the
* mounted filesystem, OR a valid mountable description.
*/
#define REQUIRE_ROOT_OR_RESOLVE_MOUNTABLE(string, mountable, is_filein) \
do { \
if (is_device_parameter ((string)) || (string)[0] != '/') { \
RESOLVE_MOUNTABLE ((string), (mountable), (is_filein)); \
} \
else { \
NEED_ROOT ((is_filein), return); \
/* NB: It's a path, not a device. */ \
(mountable).type = MOUNTABLE_PATH; \
(mountable).device = strdup ((string)); \
(mountable).volume = NULL; \
if ((mountable).device == NULL) { \
if (is_filein) cancel_receive (); \
reply_with_perror ("strdup"); \
return; \
} \
} \
} while (0) \
#endif /* GUESTFSD_STUBS_MACROS_H */
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