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Annotation of embedaddon/php/Zend/zend_canary.c, revision 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:  */