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https://github.com/opnsense/src.git
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ecb246eba6
the problems related to the handling of broken DNSSEC trust chains. This fix is only relevant for those who have DNSSEC validation enabled and configure trust anchors from third parties, either manually, or through a system like DLV.
113 lines
2.7 KiB
C
113 lines
2.7 KiB
C
/*
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* Copyright (C) 2004, 2005, 2007, 2009 Internet Systems Consortium, Inc. ("ISC")
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* Copyright (C) 1999-2003 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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/* $Id: random.c,v 1.25.332.2 2009/07/16 23:47:17 tbox Exp $ */
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/*! \file */
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#include <config.h>
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#include <stdlib.h>
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#include <time.h> /* Required for time(). */
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <isc/mutex.h>
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#include <isc/once.h>
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#include <isc/random.h>
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#include <isc/string.h>
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#include <isc/util.h>
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static isc_once_t once = ISC_ONCE_INIT;
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static void
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initialize_rand(void)
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{
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#ifndef HAVE_ARC4RANDOM
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unsigned int pid = getpid();
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/*
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* The low bits of pid generally change faster.
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* Xor them with the high bits of time which change slowly.
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*/
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pid = ((pid << 16) & 0xffff0000) | ((pid >> 16) & 0xffff);
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srand(time(NULL) ^ pid);
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#endif
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}
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static void
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initialize(void)
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{
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RUNTIME_CHECK(isc_once_do(&once, initialize_rand) == ISC_R_SUCCESS);
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}
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void
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isc_random_seed(isc_uint32_t seed)
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{
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initialize();
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#ifndef HAVE_ARC4RANDOM
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srand(seed);
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#else
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arc4random_addrandom((u_char *) &seed, sizeof(isc_uint32_t));
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#endif
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}
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void
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isc_random_get(isc_uint32_t *val)
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{
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REQUIRE(val != NULL);
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initialize();
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#ifndef HAVE_ARC4RANDOM
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/*
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* rand()'s lower bits are not random.
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* rand()'s upper bit is zero.
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*/
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#if RAND_MAX >= 0xfffff
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/* We have at least 20 bits. Use lower 16 excluding lower most 4 */
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*val = ((rand() >> 4) & 0xffff) | ((rand() << 12) & 0xffff0000);
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#elif RAND_MAX >= 0x7fff
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/* We have at least 15 bits. Use lower 10/11 excluding lower most 4 */
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*val = ((rand() >> 4) & 0x000007ff) | ((rand() << 7) & 0x003ff800) |
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((rand() << 18) & 0xffc00000);
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#else
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#error RAND_MAX is too small
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#endif
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#else
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*val = arc4random();
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#endif
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}
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isc_uint32_t
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isc_random_jitter(isc_uint32_t max, isc_uint32_t jitter) {
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isc_uint32_t rnd;
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REQUIRE(jitter < max);
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if (jitter == 0)
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return (max);
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isc_random_get(&rnd);
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return (max - rnd % jitter);
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}
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