/* * crypt.c	A thread-safe crypt wrapper * *   This library is free software; you can redistribute it and/or *   modify it under the terms of the GNU Lesser General Public *   License as published by the Free Software Foundation; either *   version 2.1 of the License, or (at your option) any later version. * *   This library 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 *   Lesser General Public License for more details. * *   You should have received a copy of the GNU Lesser General Public *   License along with this library; if not, write to the Free Software *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA * * Copyright 2000  The FreeRADIUS server project */#include "libradius.h"#include <stdlib.h>#include <unistd.h>#include <string.h>#ifdef HAVE_PTHREAD_H#include	<pthread.h>/* *  No pthreads, no mutex. */static int lrad_crypt_init = 0;static pthread_mutex_t lrad_crypt_mutex;#endif/* * performs a crypt password check in an thread-safe way. * * returns:  0 -- check succeeded *          -1 -- failed to crypt *           1 -- check failed */int lrad_crypt_check(const char *key, const char *crypted){	char *passwd;	int cmp = 0;#ifdef HAVE_PTHREAD_H	/*	 *	Ensure we're thread-safe, as crypt() isn't.	 */	if (lrad_crypt_init == 0) {		pthread_mutex_init(&lrad_crypt_mutex, NULL);		lrad_crypt_init = 1;	}	pthread_mutex_lock(&lrad_crypt_mutex);#endif	passwd = crypt(key, crypted);	/*	 *	Got something, check it within the lock.  This is	 *	faster than copying it to a local buffer, and the	 *	time spent within the lock is critical.	 */	if (passwd) {		cmp = strcmp(crypted, passwd);	}#ifdef HAVE_PTHREAD_H	pthread_mutex_unlock(&lrad_crypt_mutex);#endif	/*	 *	Error.	 */	if (!passwd) {		return -1;	}	/*	 *	OK, return OK.	 */	if (cmp == 0) {		return 0;	}	/*	 *	Comparison failed.	 */	return 1;}