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/*
* rngd_linux.c -- Entropy sink for the Linux Kernel (/dev/random)
*
* Copyright (C) 2001 Philipp Rumpf
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#define _GNU_SOURCE
#ifndef HAVE_CONFIG_H
#error Invalid or missing autoconf build environment
#endif
#include "rng-tools-config.h"
#include <unistd.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <syslog.h>
#include <sys/ioctl.h>
#include <sys/poll.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/time.h>
#include <time.h>
#include <linux/types.h>
#include <linux/random.h>
#include <string.h>
#include "rngd.h"
#include "fips.h"
#include "exits.h"
#include "rngd_linux.h"
/* Kernel output device */
static int random_fd;
/*
* Initialize the interface to the Linux Kernel
* entropy pool (through /dev/random)
*
* randomdev is the path to the random device
*/
void init_kernel_rng(const char* randomdev)
{
random_fd = open(randomdev, O_RDWR);
if (random_fd == -1) {
message(LOG_DAEMON|LOG_ERR, "can't open %s: %s",
randomdev, strerror(errno));
exit(EXIT_USAGE);
}
}
void random_add_entropy(void *buf, size_t size)
{
struct {
int ent_count;
int size;
unsigned char data[size];
} entropy;
entropy.ent_count = size * 8;
entropy.size = size;
memcpy(entropy.data, buf, size);
if (ioctl(random_fd, RNDADDENTROPY, &entropy) != 0) {
message(LOG_DAEMON|LOG_ERR, "RNDADDENTROPY failed: %s\n",
strerror(errno));
exit(1);
}
}
void random_sleep(double poll_timeout)
{
int ent_count;
struct pollfd pfd = {
fd: random_fd,
events: POLLOUT,
};
if (ioctl(random_fd, RNDGETENTCNT, &ent_count) == 0 &&
ent_count < arguments->fill_watermark)
return;
poll(&pfd, 1, 1000.0 * poll_timeout);
}
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