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/*
* 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
#define _FILE_OFFSET_BITS 64
#ifndef _LARGEFILE_SOURCE
#define _LARGEFILE_SOURCE
#endif
#ifndef _LARGEFILE64_SOURCE
#define _LARGEFILE64_SOURCE
#endif
#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
}
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