88 lines
2.4 KiB
C
88 lines
2.4 KiB
C
/* wrap getfilecon, lgetfilecon, and fgetfilecon
|
|
Copyright (C) 2009-2022 Free Software Foundation, Inc.
|
|
|
|
This file is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License as
|
|
published by the Free Software Foundation; either version 2.1 of the
|
|
License, or (at your option) any later version.
|
|
|
|
This file 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 Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser 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, char **con);
|
|
int lgetfilecon (char const *file, char **con);
|
|
int fgetfilecon (int fd, char **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, char **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, char **con)
|
|
{
|
|
int ret = getfilecon (file, con);
|
|
return map_to_failure (ret, con);
|
|
}
|
|
|
|
int
|
|
rpl_lgetfilecon (char const *file, char **con)
|
|
{
|
|
int ret = lgetfilecon (file, con);
|
|
return map_to_failure (ret, con);
|
|
}
|
|
|
|
int
|
|
rpl_fgetfilecon (int fd, char**con)
|
|
{
|
|
int ret = fgetfilecon (fd, con);
|
|
return map_to_failure (ret, con);
|
|
}
|