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/* wrap getfilecon, lgetfilecon, and fgetfilecon
Copyright (C) 2009-2020 Free Software Foundation, 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 3, 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, see <https://www.gnu.org/licenses/>. */
/* written by Jim Meyering */
#include <config.h>
#include <selinux/selinux.h>
#include <sys/types.h>
#include <errno.h>
#include <string.h>
/* FIXME: remove this once there is an errno-gnu module
that guarantees the definition of ENODATA. */
#ifndef ENODATA
# define ENODATA ENOTSUP
#endif
#undef getfilecon
#undef lgetfilecon
#undef fgetfilecon
int getfilecon (char const *file, security_context_t *con);
int lgetfilecon (char const *file, security_context_t *con);
int fgetfilecon (int fd, security_context_t *con);
/* getfilecon, lgetfilecon, and fgetfilecon can all misbehave, be it
via an old version of libselinux where these would return 0 and set the
result context to NULL, or via a modern kernel+lib operating on a file
from a disk whose attributes were set by a kernel from around 2006.
In that latter case, the functions return a length of 10 for the
"unlabeled" context. Map both failures to a return value of -1, and
set errno to ENOTSUP in the first case, and ENODATA in the latter. */
static int
map_to_failure (int ret, security_context_t *con)
{
if (ret == 0)
{
errno = ENOTSUP;
return -1;
}
if (ret == 10 && strcmp (*con, "unlabeled") == 0)
{
freecon (*con);
*con = NULL;
errno = ENODATA;
return -1;
}
return ret;
}
int
rpl_getfilecon (char const *file, security_context_t *con)
{
int ret = getfilecon (file, con);
return map_to_failure (ret, con);
}
int
rpl_lgetfilecon (char const *file, security_context_t *con)
{
int ret = lgetfilecon (file, con);
return map_to_failure (ret, con);
}
int
rpl_fgetfilecon (int fd, security_context_t *con)
{
int ret = fgetfilecon (fd, con);
return map_to_failure (ret, con);
}
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