/*

 * getenv.c --- implement a safe getenv for use by the ext2fs library

 *

 * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,

 *  2002 by Theodore Ts'o.

 *

 * %Begin-Header%

 * This file may be redistributed under the terms of the GNU Library

 * General Public License, version 2.

 * %End-Header%

 */

#if !defined(__FreeBSD__) && !defined(__NetBSD__) && !defined(__OpenBSD__)

#define _XOPEN_SOURCE 600

#define _DARWIN_C_SOURCE

#ifndef _GNU_SOURCE

#define _GNU_SOURCE

#endif

#endif

#include "config.h"

#include <stdlib.h>

#if HAVE_UNISTD_H

#include <unistd.h>

#endif

#ifdef HAVE_SYS_PRCTL_H

#include <sys/prctl.h>

#else

#define PR_GET_DUMPABLE 3

#endif

#if (!defined(HAVE_PRCTL) && defined(linux))

#include <sys/syscall.h>

#endif

#include "ext2fs.h"

char *ext2fs_safe_getenv(const char *arg)

{

  if ((getuid() != geteuid()) || (getgid() != getegid()))

    return NULL;

#ifdef HAVE_PRCTL

  if (prctl(PR_GET_DUMPABLE, 0, 0, 0, 0) == 0)

    return NULL;

#else

#if (defined(linux) && defined(SYS_prctl))

  if (syscall(SYS_prctl, PR_GET_DUMPABLE, 0, 0, 0, 0) == 0)

    return NULL;

#endif

#endif

#if defined(HAVE_SECURE_GETENV)

  return secure_getenv(arg);

#elif defined(HAVE___SECURE_GETENV)

  return __secure_getenv(arg);

#else

  return getenv(arg);

#endif

}