mirror of
https://github.com/libguestfs/libguestfs.git
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c663ab3bb9
Return an empty string (instead of an error) if no capabilities are set on a file, and document that in the API.
124 lines
2.6 KiB
C
124 lines
2.6 KiB
C
/* libguestfs - the guestfsd daemon
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* Copyright (C) 2012 Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <limits.h>
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#include <unistd.h>
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#include "guestfs_protocol.h"
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#include "daemon.h"
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#include "actions.h"
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#include "optgroups.h"
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#if defined(HAVE_CAP)
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#include <sys/capability.h>
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int
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optgroup_linuxcaps_available (void)
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{
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return 1;
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}
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char *
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do_cap_get_file (const char *path)
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{
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cap_t cap;
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char *r, *ret;
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CHROOT_IN;
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cap = cap_get_file (path);
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CHROOT_OUT;
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if (cap == NULL) {
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/* The getcap utility (part of libcap) ignores ENODATA. It just
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* means there is no capability attached to the file (RHBZ#989356).
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*/
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if (errno == ENODATA) {
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ret = strdup ("");
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if (ret == NULL) {
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reply_with_perror ("strdup");
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return NULL;
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}
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return ret;
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}
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reply_with_perror ("%s", path);
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return NULL;
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}
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r = cap_to_text (cap, NULL);
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if (r == NULL) {
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reply_with_perror ("cap_to_text");
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cap_free (cap);
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return NULL;
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}
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cap_free (cap);
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/* 'r' is not an ordinary pointer that can be freed with free(3)!
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* In the current implementation of libcap, if you try to do that it
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* will segfault. We have to duplicate this into an ordinary
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* buffer, then call cap_free (r).
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*/
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ret = strdup (r);
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if (ret == NULL) {
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reply_with_perror ("strdup");
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cap_free (r);
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return NULL;
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}
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cap_free (r);
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return ret; /* caller frees */
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}
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int
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do_cap_set_file (const char *path, const char *capstr)
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{
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cap_t cap;
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int r;
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cap = cap_from_text (capstr);
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if (cap == NULL) {
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reply_with_perror ("could not parse cap string: %s: cap_from_text", capstr);
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return -1;
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}
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CHROOT_IN;
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r = cap_set_file (path, cap);
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CHROOT_OUT;
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if (r == -1) {
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reply_with_perror ("%s", path);
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cap_free (cap);
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return -1;
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}
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cap_free (cap);
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return 0;
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}
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#else /* no libcap */
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OPTGROUP_LINUXCAPS_NOT_AVAILABLE
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#endif /* no libcap */
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