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/*
* hfsutils - tools for reading and writing Macintosh HFS volumes
* Copyright (C) 1996-1998 Robert Leslie
*
* 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 2 of the License, 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, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id: suid.c,v 1.7 1998/04/11 08:27:00 rob Exp $
*/
# ifdef HAVE_CONFIG_H
# include "config.h"
# endif
# include <sys/types.h>
# ifdef HAVE_UNISTD_H
# include <unistd.h>
# else
uid_t getuid(void);
uid_t geteuid(void);
gid_t getgid(void);
gid_t getegid(void);
# ifdef HAVE_SETREUID
int setreuid(uid_t, uid_t);
int setregid(gid_t, gid_t);
# else
int setuid(uid_t);
int setgid(gid_t);
# endif
# endif
# include "suid.h"
static uid_t uid, euid;
static gid_t gid, egid;
/*
* NAME: suid->init()
* DESCRIPTION: initialize application which may be running setuid/setgid
*/
void suid_init(void)
{
uid = getuid();
gid = getgid();
euid = geteuid();
egid = getegid();
suid_disable();
}
/*
* NAME: suid->enable()
* DESCRIPTION: engage any setuid privileges
*/
void suid_enable(void)
{
# ifdef HAVE_SETREUID
setreuid(-1, euid);
setregid(-1, egid);
# else
setuid(euid);
setgid(egid);
# endif
}
/*
* NAME: suid->disable()
* DESCRIPTION: revoke all setuid privileges
*/
void suid_disable(void)
{
# ifdef HAVE_SETREUID
setreuid(-1, uid);
setregid(-1, gid);
# else
setuid(uid);
setgid(gid);
# endif
}
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