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/*
* Copyright (C) 2016 Red Hat, 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 <https://www.gnu.org/licenses/>.
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
/* This program verifies whether the low-level random functions can operate
* properly, even if interrupted by signals */
#if defined(HAVE_SETITIMER) && (defined(HAVE_LINUX_GETRANDOM) || defined(__linux__))
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/time.h>
#include <errno.h>
#include <stdint.h>
#include "utils.h"
#define _gnutls_debug_log printf
#define gnutls_assert()
#define gnutls_assert_val(val) val
int _rnd_system_entropy_init(void);
int _rnd_system_entropy_check(void);
void _rnd_system_entropy_deinit(void);
typedef int (*get_entropy_func)(void* rnd, size_t size);
get_entropy_func _rnd_get_system_entropy;
#define RND_NO_INCLUDES
#include "../lib/nettle/sysrng-linux.c"
static volatile int stop_loop = 0;
static void sig_handler(int signo)
{
stop_loop++;
}
void doit(void)
{
char buf[512];
char empty[32];
int ret;
struct itimerval ival;
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = sig_handler;
sigemptyset (&sa.sa_mask);
sigaction(SIGALRM, &sa, NULL);
memset(&ival, 0, sizeof(ival));
ival.it_interval.tv_usec = 5000;
ival.it_value.tv_usec = 5000;
_rnd_system_entropy_init();
ret = setitimer(ITIMER_REAL, &ival, NULL);
if (ret < 0) {
fail("error in setitimer: %s\n", strerror(errno));
}
memset(empty, 0, sizeof(empty));
for (;stop_loop<1024;) {
memset(buf, 0, sizeof(buf));
ret = _rnd_get_system_entropy(buf, sizeof(buf));
if (ret < 0) {
fail("error obtaining entropy: %s\n", gnutls_strerror(ret));
}
if (memcmp(empty, buf+sizeof(buf)-sizeof(empty)-1, sizeof(empty)) == 0) {
fail("_rnd_get_system_entropy: did not fill buffer\n");
}
}
_rnd_system_entropy_deinit();
}
#else
void doit(void); /* prototype to avoid warning with -Wmissing-prototypes */
void doit(void)
{
exit(77);
}
#endif
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