/*****************************************************************************
 *
 * $Id$
 * Purpose ...............: MBSE BBS Shadow Password Suite
 * Original Source .......: Shadow Password Suite
 * Original Copyrioght ...: Julianne Frances Haugh and others.
 *
 *****************************************************************************
 * Copyright (C) 1997-2001
 *   
 * Michiel Broek		FIDO:		2:280/2802
 * Beekmansbos 10
 * 1971 BV IJmuiden
 * the Netherlands
 *
 * This file is part of MBSE BBS.
 *
 * This BBS 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, or (at your option) any
 * later version.
 *
 * MBSE BBS 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 MBSE BBS; see the file COPYING.  If not, write to the Free
 * Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *****************************************************************************/

/*
 * salt.c - generate a random salt string for crypt()
 *
 * Written by Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>,
 * public domain.
 */
#include "../config.h"
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#ifdef TIME_WITH_SYS_TIME
#include <time.h>
#endif
#include <sys/time.h>
#include "rad64.h"


#if 1
#include "getdef.h"


/*
 * Generate 8 base64 ASCII characters of random salt.  If MD5_CRYPT_ENAB
 * in /etc/login.defs is "yes", the salt string will be prefixed by "$1$"
 * (magic) and pw_encrypt() will execute the MD5-based FreeBSD-compatible
 * version of crypt() instead of the standard one.
 */
char *crypt_make_salt(void)
{
	struct timeval tv;
	static char result[40];

	result[0] = '\0';

	if (getdef_bool("MD5_CRYPT_ENAB")) {
		strcpy(result, "$1$");  /* magic for the new MD5 crypt() */
	}

	/*
	 * Generate 8 chars of salt, the old crypt() will use only first 2.
	 */
	gettimeofday(&tv, (struct timezone *) 0);
	strcat(result, l64a(tv.tv_usec));
	strcat(result, l64a(tv.tv_sec + getpid() + clock()));

	if (strlen(result) > 3 + 8)  /* magic+salt */
		result[11] = '\0';

	return result;
}
#else

/*
 * This is the old style random salt generator...
 */
char *crypt_make_salt(void)
{
	time_t now;
	static unsigned long x;
	static char result[3];

	now = time(NULL);
	x += now + getpid() + clock();
	result[0] = i64c(((x >> 18) ^ (x >> 6)) & 077);
	result[1] = i64c(((x >> 12) ^ x) & 077);
	result[2] = '\0';
	return result;
}
#endif