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/*
* rngd_threads.c -- Common thread code
* Copyright (C) 2004 Henrique de Moraes Holschuh <hmh@debian.org>
*
* 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 <errno.h>
#include <string.h>
#include <pthread.h>
#include <sys/mman.h>
#include <assert.h>
#include "rngd.h"
#include "fips.h"
#include "stats.h"
#include "exits.h"
#include "rngd_threads.h"
/* Buffers for RNG data */
int rng_buffers = 0; /* number of active buffers */
rng_buffer_t **rng_buf = NULL; /* vector of pointers to the buffers */
/*
* FIFOs to pass blocks among the threads
*/
struct buffer_queues buffer_queues;
/*
* Get the amount of data in a FIFO
*/
int getbuffifo_count(struct buf_fifo *fifo)
{
int count;
assert(fifo != NULL);
pthread_mutex_lock(&(fifo->mutex));
count = (fifo->head >= fifo->tail) ?
fifo->head - fifo->tail :
GETBUFFIFO_SIZE + fifo->head - fifo->tail;
pthread_mutex_unlock(&(fifo->mutex));
return count;
}
/* handy malloc()/calloc() error handler */
void *test_malloc(void *p) {
if (!p) {
message(LOG_ERR, "cannot allocate buffers");
die(EXIT_OSERR);
}
return p;
}
/*
* Init the RNG buffer structures
*/
#define BUFFIFO_INIT(fifo) do { \
pthread_mutex_init(&buffer_queues.fifo.mutex, NULL); \
buffer_queues.fifo.head = buffer_queues.fifo.tail = 0; \
buffer_queues.fifo.data = test_malloc(calloc(GETBUFFIFO_SIZE, \
sizeof(*buffer_queues.fifo.data))); \
} while (0)
void init_rng_buffers(int n)
{
int i;
assert(n <= MAX_RNG_BUFFERS);
rng_buffers = n;
BUFFIFO_INIT(empty);
BUFFIFO_INIT(full);
BUFFIFO_INIT(accepted);
BUFFIFO_INIT(rejected);
rng_buf = test_malloc(calloc(rng_buffers, sizeof(*rng_buf)));
for (i = 0; i < rng_buffers; i++) {
BUFFIFO_WRITE(empty, i);
rng_buf[i] = test_malloc(malloc(FIPS_RNG_BUFFER_SIZE));
if (mlock(rng_buf[i], FIPS_RNG_BUFFER_SIZE)) {
message_strerr(LOG_ERR, errno, "cannot lock buffers");
die(EXIT_OSERR);
}
}
}
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