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/* $Id$ */
/***
This file is part of polypaudio.
polypaudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
polypaudio is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with polypaudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <time.h>
#include <polypcore/util.h>
#include <polypcore/log.h>
#include "random.h"
static int has_whined = 0;
static const char *devices[] = { "/dev/urandom", "/dev/random", NULL };
static int random_proper(void *ret_data, size_t length) {
#ifdef OS_IS_WIN32
assert(ret_data && length);
return -1;
#else /* OS_IS_WIN32 */
int fd, ret;
ssize_t r = 0;
const char **device;
assert(ret_data && length);
device = devices;
while (*device) {
ret = 0;
if ((fd = open(*device, O_RDONLY)) >= 0) {
if ((r = pa_loop_read(fd, ret_data, length)) < 0 || (size_t) r != length)
ret = -1;
close(fd);
} else
ret = -1;
if (ret == 0)
break;
}
return ret;
#endif /* OS_IS_WIN32 */
}
void pa_random_seed(void) {
unsigned int seed;
if (random_proper(&seed, sizeof(unsigned int)) < 0) {
if (!has_whined)
pa_log_warn(__FILE__": failed to get proper entropy. Falling back to seeding with current time.");
has_whined = 1;
seed = (unsigned int) time(NULL);
}
srand(seed);
}
void pa_random(void *ret_data, size_t length) {
uint8_t *p;
size_t l;
assert(ret_data && length);
if (random_proper(ret_data, length) >= 0)
return;
if (!has_whined)
pa_log_warn(__FILE__": failed to get proper entropy. Falling back to unsecure pseudo RNG.");
has_whined = 1;
for (p = ret_data, l = length; l > 0; p++, l--)
*p = (uint8_t) rand();
}
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