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Code Issues Releases Wiki Activity

1405. [func] Use arc4random() if available.

Browse Source 
from: jakob@crt.se
reviewed: marka
This commit is contained in:
Mark Andrews
2002-12-04 01:19:28 +00:00
parent 297a2cb41e
commit 5b76a09697
6 changed files with 43 additions and 5 deletions
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2
CHANGES
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@@ -1,3 +1,5 @@
1405. [func] Use arc4random() if available.
1404. [bug] libbind: ns_name_ntol() could overwite a zero length
buffer.

5
acconfig.h
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@@ -15,7 +15,7 @@
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: acconfig.h,v 1.38 2002/10/15 04:32:49 marka Exp $ */
/* $Id: acconfig.h,v 1.39 2002/12/04 01:19:27 marka Exp $ */
/***
*** This file is not to be included by any public header files, because
@@ -76,6 +76,9 @@
/* define if gai_strerror() exists */
#undef HAVE_GAISTRERROR
/* define if arc4random() exists */
#undef HAVE_ARC4RANDOM
/* define if pthread_setconcurrency() should be called to tell the
* OS how many threads we might want to run.
*/

8
bin/tests/genrandom.c
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@@ -15,7 +15,7 @@
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: genrandom.c,v 1.8 2001/01/09 21:41:04 bwelling Exp $ */
/* $Id: genrandom.c,v 1.9 2002/12/04 01:19:28 marka Exp $ */
#include <config.h>
@@ -47,9 +47,15 @@ main(int argc, char **argv) {
exit(1);
}
#ifndef HAVE_ARC4RANDOM
srand(0x12345678);
#endif
while (bytes > 0) {
#ifndef HAVE_ARC4RANDOM
unsigned short int x = (rand() & 0xFFFF);
#else
unsigned short int x = (arc4random() & 0xFFFF);
#endif
unsigned char c = x & 0xFF;
if (putc(c, fp) == EOF) {
printf("error writing to file\n");

7
configure.in
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@@ -18,7 +18,7 @@ AC_DIVERT_PUSH(AC_DIVERSION_NOTICE)dnl
esyscmd([sed "s/^/# /" COPYRIGHT])dnl
AC_DIVERT_POP()dnl
AC_REVISION($Revision: 1.333 $)
AC_REVISION($Revision: 1.334 $)
AC_INIT(lib/dns/name.c)
AC_PREREQ(2.13)
@@ -521,6 +521,11 @@ case "$use_randomdev" in
;;
esac
#
# Do we have arc4random() ?
#
AC_CHECK_FUNC(arc4random, AC_DEFINE(HAVE_ARC4RANDOM))
#
# Begin pthreads checking.
#

10
lib/dns/rdataset.c
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@@ -15,7 +15,7 @@
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: rdataset.c,v 1.63 2002/04/02 06:06:29 marka Exp $ */
/* $Id: rdataset.c,v 1.64 2002/12/04 01:19:28 marka Exp $ */
#include <config.h>
@@ -370,7 +370,11 @@ towiresorted(dns_rdataset_t *rdataset, dns_name_t *owner_name,
*/
for (i = 0; i < count; i++) {
dns_rdata_t rdata;
#ifndef HAVE_ARC4RANDOM
choice = i + (((u_int)rand()>>3) % (count - i));
#else
choice = i + (((u_int)arc4random()>>3) % (count - i));
#endif
rdata = shuffled[i];
shuffled[i] = shuffled[choice];
shuffled[choice] = rdata;
@@ -385,7 +389,11 @@ towiresorted(dns_rdataset_t *rdataset, dns_name_t *owner_name,
/*
* "Cyclic" order.
*/
#ifndef HAVE_ARC4RANDOM
unsigned int j = (((unsigned int)rand()) >> 3) % count;
#else
unsigned int j = (((unsigned int)arc4random()) >> 3) % count;
#endif
for (i = 0; i < count; i++) {
if (order != NULL)
sorted[j].key = (*order)(&shuffled[i],

16
lib/isc/random.c
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@@ -15,7 +15,7 @@
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: random.c,v 1.15 2001/01/09 21:56:22 bwelling Exp $ */
/* $Id: random.c,v 1.16 2002/12/04 01:19:28 marka Exp $ */
#include <config.h>
@@ -33,7 +33,9 @@ static isc_once_t once = ISC_ONCE_INIT;
static void
initialize_rand(void)
{
#ifndef HAVE_ARC4RANDOM
srand(time(NULL));
#endif
}
static void
@@ -47,7 +49,11 @@ 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
@@ -57,7 +63,11 @@ isc_random_get(isc_uint32_t *val)
initialize();
#ifndef HAVE_ARC4RANDOM
*val = rand();
#else
*val = arc4random();
#endif
}
isc_uint32_t
@@ -66,5 +76,9 @@ isc_random_jitter(isc_uint32_t max, isc_uint32_t jitter) {
if (jitter == 0)
return (max);
else
#ifndef HAVE_ARC4RANDOM
return (max - rand() % jitter);
#else
return (max - arc4random() % jitter);
#endif
}