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/* libguestfs - the guestfsd daemon
* Copyright (C) 2012 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.
*/
#include <config.h>
#include <stdio.h>
#include <limits.h>
#include <unistd.h>
#include "guestfs_protocol.h"
#include "daemon.h"
#include "actions.h"
#include "optgroups.h"
#if defined(HAVE_CAP)
#include <sys/capability.h>
int
optgroup_linuxcaps_available (void)
{
return 1;
}
char *
do_cap_get_file (const char *path)
{
cap_t cap;
char *r, *ret;
CHROOT_IN;
cap = cap_get_file (path);
CHROOT_OUT;
if (cap == NULL) {
/* The getcap utility (part of libcap) ignores ENODATA. It just
* means there is no capability attached to the file (RHBZ#989356).
*/
if (errno == ENODATA) {
ret = strdup ("");
if (ret == NULL) {
reply_with_perror ("strdup");
return NULL;
}
return ret;
}
reply_with_perror ("%s", path);
return NULL;
}
r = cap_to_text (cap, NULL);
if (r == NULL) {
reply_with_perror ("cap_to_text");
cap_free (cap);
return NULL;
}
cap_free (cap);
/* 'r' is not an ordinary pointer that can be freed with free(3)!
* In the current implementation of libcap, if you try to do that it
* will segfault. We have to duplicate this into an ordinary
* buffer, then call cap_free (r).
*/
ret = strdup (r);
if (ret == NULL) {
reply_with_perror ("strdup");
cap_free (r);
return NULL;
}
cap_free (r);
return ret; /* caller frees */
}
int
do_cap_set_file (const char *path, const char *capstr)
{
cap_t cap;
int r;
cap = cap_from_text (capstr);
if (cap == NULL) {
reply_with_perror ("could not parse cap string: %s: cap_from_text", capstr);
return -1;
}
CHROOT_IN;
r = cap_set_file (path, cap);
CHROOT_OUT;
if (r == -1) {
reply_with_perror ("%s", path);
cap_free (cap);
return -1;
}
cap_free (cap);
return 0;
}
#else /* no libcap */
OPTGROUP_LINUXCAPS_NOT_AVAILABLE
#endif /* no libcap */
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