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/* Copyright (C) 2017-2021 Free Software Foundation, Inc.
This file is part of GCC.
GCC 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.
GCC 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.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#ifndef _SECURE_GETENV_H
#define _SECURE_GETENV_H 1
/* Secure getenv() which returns NULL if running as SUID/SGID. */
#ifndef HAVE_SECURE_GETENV
#if defined (HAVE_UNISTD_H) && defined (HAVE_GETUID) \
&& defined (HAVE_GETEUID) && defined (HAVE_GETGID) \
&& defined (HAVE_GETEGID)
#include <unistd.h>
#if SUPPORTS_WEAKREF && defined (HAVE___SECURE_GETENV)
static char* weak_secure_getenv (const char*)
__attribute__((__weakref__("__secure_getenv")));
#endif
/* Implementation of secure_getenv() for targets where it is not provided but
we have at least means to test real and effective IDs. */
static inline char *
secure_getenv (const char *name)
{
#if SUPPORTS_WEAKREF && defined (HAVE___SECURE_GETENV)
if (weak_secure_getenv)
return weak_secure_getenv (name);
#endif
if ((getuid () == geteuid ()) && (getgid () == getegid ()))
return getenv (name);
else
return NULL;
}
#else
#define secure_getenv getenv
#endif
#endif
#endif /* _SECURE_GETENV_H. */
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