projects / OpenSPARC-T2-DV / blame
| Commit | Line | Data |
|---|---|---|
| 86530b38 AT |
1 | /* |
| 2 | * $Id: libnet_prand.c,v 1.21 2005/11/29 21:54:46 carlosc 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 */ |