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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.
***/
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <time.h>
#include "random.h"
#include "util.h"
#include "log.h"
#define RANDOM_DEVICE "/dev/urandom"
void pa_random(void *ret_data, size_t length) {
int fd;
ssize_t r = 0;
assert(ret_data && length);
if ((fd = open(RANDOM_DEVICE, O_RDONLY)) >= 0) {
if ((r = pa_loop_read(fd, ret_data, length)) < 0 || (size_t) r != length)
pa_log_error(__FILE__": failed to read entropy from '%s'\n", RANDOM_DEVICE);
close(fd);
}
if ((size_t) r != length) {
uint8_t *p;
size_t l;
pa_log_warn(__FILE__": WARNING: Failed to open entropy device '"RANDOM_DEVICE"': %s"
", falling back to unsecure pseudo RNG.\n", strerror(errno));
srandom(time(NULL));
for (p = ret_data, l = length; l > 0; p++, l--)
*p = (uint8_t) random();
}
}
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