pwd_internal.c
上传用户:tsgydb
上传日期:2007-04-14
资源大小:10674k
文件大小:3k
- /* ==== pwd_internal.c ============================================================
- * Copyright (c) 1993, 1994 by Chris Provenzano, proven@mit.edu
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by Chris Provenzano.
- * 4. The name of Chris Provenzano may not be used to endorse or promote
- * products derived from this software without specific prior written
- * permission.
- *
- * THIS SOFTWARE IS PROVIDED BY CHRIS PROVENZANO ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL CHRIS PROVENZANO BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * Description : Thread-safe password hacking functions.
- *
- * 1.00 95/02/08 snl
- * -Started coding this file.
- */
- #include <pthread.h>
- #include <stdlib.h>
- #include <stdio.h>
- #include <pwd.h>
- #include <unistd.h>
- #include "pwd_internal.h"
- static pthread_once_t __pw_init = PTHREAD_ONCE_INIT;
- static pthread_key_t __pw_key;
- void
- _pw_null_cleanup(void *junkola)
- {
- pwf_context_t *x = (pwf_context_t *)junkola;
- if (x) {
- if (x->pwf) {
- fclose(x->pwf);
- x->pwf = 0;
- }
- #ifdef DBM_PWD_SUPPORT
- if (x->pw_db) {
- dbm_close(x->pw_db);
- x->pw_db = 0;
- }
- #endif /* DBM_PWD_SUPPORT */
- free((void *)x);
- }
- }
- void
- _pw_create_key()
- {
- if (pthread_key_create(&__pw_key, _pw_null_cleanup)) {
- PANIC();
- }
- }
- pwf_context_t *
- _pw_get_data()
- {
- pwf_context_t *_data;
- pthread_once(&__pw_init, _pw_create_key);
- _data = (pwf_context_t *)pthread_getspecific(__pw_key);
- if (!_data) {
- _data = (pwf_context_t *)malloc(sizeof(pwf_context_t));
- if (_data) {
- _data->pwf = 0;
- _data->line[0] = ' ';
- _data->pw_stayopen = 0;
- _data->pw_file = "/etc/passwd";
- #ifdef DBM_PWD_SUPPORT
- _data->pw_db = 0;
- #endif /* DBM_PWD_SUPPORT */
- pthread_setspecific(__pw_key, (void *)_data);
- }
- }
- return _data;
- }