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| author | des <des@FreeBSD.org> | 2013-09-30 17:23:45 +0000 |
|---|---|---|
| committer | des <des@FreeBSD.org> | 2013-09-30 17:23:45 +0000 |
| commit | aa2e4b623cdc1d9d2b44a103d24ecb7e0c984de9 (patch) | |
| tree | 1a2886b0de387ddff665d0e370f40ffc32778840 /contrib/bind9/lib/isc/random.c | |
| parent | 9e2a5c1c0e7dbd2e8116aa8f1ce21759dec75295 (diff) | |
| download | FreeBSD-src-aa2e4b623cdc1d9d2b44a103d24ecb7e0c984de9.zip FreeBSD-src-aa2e4b623cdc1d9d2b44a103d24ecb7e0c984de9.tar.gz | |
Remove BIND.
Approved by: re (gjb)
Diffstat (limited to 'contrib/bind9/lib/isc/random.c')
| -rw-r--r-- | contrib/bind9/lib/isc/random.c | 113 |
1 files changed, 0 insertions, 113 deletions
diff --git a/contrib/bind9/lib/isc/random.c b/contrib/bind9/lib/isc/random.c deleted file mode 100644 index 8b73ed5..0000000 --- a/contrib/bind9/lib/isc/random.c +++ /dev/null @@ -1,113 +0,0 @@ -/* - * Copyright (C) 2004, 2005, 2007, 2009 Internet Systems Consortium, Inc. ("ISC") - * Copyright (C) 1999-2003 Internet Software Consortium. - * - * Permission to use, copy, modify, and/or distribute this software for any - * purpose with or without fee is hereby granted, provided that the above - * copyright notice and this permission notice appear in all copies. - * - * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH - * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY - * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, - * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM - * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE - * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR - * PERFORMANCE OF THIS SOFTWARE. - */ - -/* $Id: random.c,v 1.28 2009/07/16 05:52:46 marka Exp $ */ - -/*! \file */ - -#include <config.h> - -#include <stdlib.h> -#include <time.h> /* Required for time(). */ -#ifdef HAVE_SYS_TYPES_H -#include <sys/types.h> -#endif -#ifdef HAVE_UNISTD_H -#include <unistd.h> -#endif - -#include <isc/mutex.h> -#include <isc/once.h> -#include <isc/random.h> -#include <isc/string.h> -#include <isc/util.h> - -static isc_once_t once = ISC_ONCE_INIT; - -static void -initialize_rand(void) -{ -#ifndef HAVE_ARC4RANDOM - unsigned int pid = getpid(); - - /* - * The low bits of pid generally change faster. - * Xor them with the high bits of time which change slowly. - */ - pid = ((pid << 16) & 0xffff0000) | ((pid >> 16) & 0xffff); - - srand(time(NULL) ^ pid); -#endif -} - -static void -initialize(void) -{ - RUNTIME_CHECK(isc_once_do(&once, initialize_rand) == ISC_R_SUCCESS); -} - -void -isc_random_seed(isc_uint32_t seed) -{ - initialize(); - -#ifndef HAVE_ARC4RANDOM - srand(seed); -#else - arc4random_addrandom((u_char *) &seed, sizeof(isc_uint32_t)); -#endif -} - -void -isc_random_get(isc_uint32_t *val) -{ - REQUIRE(val != NULL); - - initialize(); - -#ifndef HAVE_ARC4RANDOM - /* - * rand()'s lower bits are not random. - * rand()'s upper bit is zero. - */ -#if RAND_MAX >= 0xfffff - /* We have at least 20 bits. Use lower 16 excluding lower most 4 */ - *val = ((rand() >> 4) & 0xffff) | ((rand() << 12) & 0xffff0000); -#elif RAND_MAX >= 0x7fff - /* We have at least 15 bits. Use lower 10/11 excluding lower most 4 */ - *val = ((rand() >> 4) & 0x000007ff) | ((rand() << 7) & 0x003ff800) | - ((rand() << 18) & 0xffc00000); -#else -#error RAND_MAX is too small -#endif -#else - *val = arc4random(); -#endif -} - -isc_uint32_t -isc_random_jitter(isc_uint32_t max, isc_uint32_t jitter) { - isc_uint32_t rnd; - - REQUIRE(jitter < max || (jitter == 0 && max == 0)); - - if (jitter == 0) - return (max); - - isc_random_get(&rnd); - return (max - rnd % jitter); -} |
