/*
 * Copyright (C) 2008-2012 Free Software Foundation, Inc.
 *
 * Author: Nikos Mavrogiannopoulos
 *
 * This file is part of GnuTLS.
 *
 * GnuTLS 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 3 of the License, or
 * (at your option) any later version.
 *
 * GnuTLS 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 GnuTLS.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#if !defined(_WIN32)
#include <sys/wait.h>
#endif

#include "utils.h"
#include <gnutls/gnutls.h>
#include <gnutls/crypto.h>

#if !defined(_WIN32)
static void dump(const char *name, unsigned char *buf, int buf_size)
{
	int i;
	printf("%s: ", name);
	for (i = 0; i < buf_size; i++)
		printf("%.2x:", buf[i]);
	printf("\n");
}

#define FILENAME "./rng-test"

void doit(void)
{
	unsigned char buf1[32];
	unsigned char buf2[32];
	pid_t pid;
	int ret;
	FILE *fp;

	global_init();
	pid = fork();
	if (pid == 0) {
		fp = fopen(FILENAME, "w");
		if (fp == NULL)
			fail("cannot open file");

		gnutls_rnd(GNUTLS_RND_NONCE, buf1, sizeof(buf1));
		if (debug)
			dump("buf1", buf1, sizeof(buf1));

		fwrite(buf1, 1, sizeof(buf1), fp);
		fclose(fp);
	} else {
		/* daddy */
		gnutls_rnd(GNUTLS_RND_NONCE, buf2, sizeof(buf2));
		if (debug)
			dump("buf2", buf2, sizeof(buf2));
		waitpid(pid, NULL, 0);

		fp = fopen(FILENAME, "r");
		if (fp == NULL)
			fail("cannot open file");

		ret = fread(buf1, 1, sizeof(buf1), fp);

		fclose(fp);
		remove(FILENAME);

		if (ret != sizeof(buf1)) {
			fail("error testing the random generator.");
			return;
		}

		if (memcmp(buf1, buf2, sizeof(buf1)) == 0) {
			fail("error in the random generator. Produces same valus after fork()");
			return;
		}
		if (debug)
			success("success\n");
	}

	gnutls_global_deinit();
}
#else
void doit(void)
{
	exit(77);
}
#endif