Return to libnet_prand.c CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / libnet / src

Annotation of embedaddon/libnet/src/libnet_prand.c, revision 1.1

1.1     ! misho       1: /*
        !             2:  *  $Id: libnet_prand.c,v 1.7 2004/01/28 19:45:00 mike Exp $
        !             3:  *
        !             4:  *  libnet
        !             5:  *  libnet_prand.c - pseudo-random number generation
        !             6:  *
        !             7:  *  Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
        !             8:  *  All rights reserved.
        !             9:  *
        !            10:  * Redistribution and use in source and binary forms, with or without
        !            11:  * modification, are permitted provided that the following conditions
        !            12:  * are met:
        !            13:  * 1. Redistributions of source code must retain the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer.
        !            15:  * 2. Redistributions in binary form must reproduce the above copyright
        !            16:  *    notice, this list of conditions and the following disclaimer in the
        !            17:  *    documentation and/or other materials provided with the distribution.
        !            18:  *
        !            19:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
        !            20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
        !            23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            29:  * SUCH DAMAGE.
        !            30:  *
        !            31:  */
        !            32:  
        !            33: #if (HAVE_CONFIG_H)
        !            34: #include "../include/config.h"
        !            35: #endif
        !            36: #if (!(_WIN32) || (__CYGWIN__)) 
        !            37: #include "../include/libnet.h"
        !            38: #else
        !            39: #include "../include/win32/libnet.h"
        !            40: #endif
        !            41: int
        !            42: libnet_seed_prand(libnet_t *l)
        !            43: {
        !            44:        #if !(__WIN32__)
        !            45:     struct timeval seed;
        !            46:        #endif
        !            47: 
        !            48:     if (l == NULL)
        !            49:     { 
        !            50:         return (-1);
        !            51:     } 
        !            52: 
        !            53:        #if __WIN32__
        !            54:     srand((unsigned)time(NULL));
        !            55:        #else
        !            56:     if (gettimeofday(&seed, NULL) == -1)
        !            57:     {
        !            58:         snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
        !            59:                 "%s(): cannot gettimeofday\n", __func__);
        !            60:         return (-1);
        !            61:     }
        !            62: 
        !            63:     /*
        !            64:      *  More entropy then just seeding with time(2).
        !            65:      */
        !            66:     srandom((unsigned)(seed.tv_sec ^ seed.tv_usec));
        !            67:        #endif
        !            68:     return (1);
        !            69: }
        !            70: 
        !            71: 
        !            72: u_int32_t
        !            73: libnet_get_prand(int mod)
        !            74: {
        !            75:     u_int32_t n;  /* 0 to 4,294,967,295 */
        !            76: #ifndef _WIN32
        !            77:     n = random();
        !            78: #else
        !            79:        HCRYPTPROV hProv = 0;
        !            80:        CryptAcquireContext(&hProv, 
        !            81:                0, 0, PROV_RSA_FULL, 
        !            82:                CRYPT_VERIFYCONTEXT);
        !            83:        
        !            84:        CryptGenRandom(hProv, 
        !            85:                sizeof(n), (BYTE*)&n);
        !            86:        CryptReleaseContext(hProv, 0); 
        !            87: #endif
        !            88:     switch (mod)
        !            89:     {
        !            90:         case LIBNET_PR2:
        !            91:             return (n % 0x2);           /* 0 - 1 */
        !            92:         case LIBNET_PR8:
        !            93:             return (n % 0xff);          /* 0 - 255 */
        !            94:         case LIBNET_PR16:
        !            95:             return (n % 0x7fff);        /* 0 - 32767 */
        !            96:         case LIBNET_PRu16:
        !            97:             return (n % 0xffff);        /* 0 - 65535 */
        !            98:         case LIBNET_PR32:
        !            99:             return (n % 0x7fffffff);    /* 0 - 2147483647 */
        !           100:         case LIBNET_PRu32:
        !           101:             return (n);                 /* 0 - 4294967295 */
        !           102:     }
        !           103:     return (0);                         /* NOTTREACHED */
        !           104: }
        !           105: 
        !           106: /* EOF */