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Annotation of embedaddon/php/Zend/zend_canary.c, revision 1.1.1.1

1.1       misho       1: /*
                      2:    +----------------------------------------------------------------------+
                      3:    | Suhosin-Patch for PHP                                                |
                      4:    +----------------------------------------------------------------------+
                      5:    | Copyright (c) 2004-2009 Stefan Esser                                 |
                      6:    +----------------------------------------------------------------------+
                      7:    | This source file is subject to version 2.02 of the PHP license,      |
                      8:    | that is bundled with this package in the file LICENSE, and is        |
                      9:    | available at through the world-wide-web at                           |
                     10:    | http://www.php.net/license/2_02.txt.                                 |
                     11:    | If you did not receive a copy of the PHP license and are unable to   |
                     12:    | obtain it through the world-wide-web, please send a note to          |
                     13:    | license@php.net so we can mail you a copy immediately.               |
                     14:    +----------------------------------------------------------------------+
                     15:    | Author: Stefan Esser <stefan.esser@sektioneins.de>                   |
                     16:    +----------------------------------------------------------------------+
                     17:  */
                     18: /* $Id: zend_canary.c,v 1.1 2004/11/26 12:45:41 ionic Exp $ */
                     19: 
                     20: #include "zend.h"
                     21: 
                     22: #include <stdio.h>
                     23: #include <stdlib.h>
                     24: 
                     25: 
                     26: #if SUHOSIN_PATCH
                     27: 
                     28: static size_t last_canary = 0x73625123;
                     29: 
                     30: /* will be replaced later with more compatible method */
                     31: ZEND_API void zend_canary(void *buf, int len)
                     32: {
                     33:        time_t t;
                     34:        size_t canary;
                     35:        int fd;
                     36:        
                     37: #ifndef PHP_WIN32
                     38:        fd = open("/dev/urandom", 0);
                     39:        if (fd != -1) {
                     40:                int r = read(fd, buf, len);
                     41:                close(fd);
                     42:                if (r == len) {
                     43:                        return;
                     44:                }
                     45:        }
                     46: #endif 
                     47:        /* not good but we never want to do this */
                     48:        time(&t);
                     49:        canary = *(unsigned int *)&t + getpid() << 16 + last_canary;
                     50:        last_canary ^= (canary << 5) | (canary >> (32-5));
                     51:        /* When we ensure full win32 compatibility in next version
                     52:           we will replace this with the random number code from zend_alloc.c */
                     53:         memcpy(buf, &canary, len);
                     54: }
                     55: 
                     56: #endif
                     57: 
                     58: 
                     59: /*
                     60:  * Local variables:
                     61:  * tab-width: 4
                     62:  * c-basic-offset: 4
                     63:  * End:
                     64:  * vim600: sw=4 ts=4 fdm=marker
                     65:  * vim<600: sw=4 ts=4
                     66:  */