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/*
*
* Connection Manager
*
* Copyright (C) 2014 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <inttypes.h>
#include <stdint.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include "connman.h"
#define URANDOM "/dev/urandom"
static int f = -1;
int __connman_util_get_random(uint64_t *val)
{
int r;
if (!val)
return -EINVAL;
r = read(f, val, sizeof(uint64_t));
if (r < 0) {
r = -errno;
connman_warn_once("Could not read from "URANDOM);
*val = random();
} else if (r != sizeof(uint64_t)) {
r = -EIO;
connman_warn_once("Short read from "URANDOM);
*val = random();
}
return r;
}
int __connman_util_init(void)
{
int r = 0;
if (f >= 0)
return 0;
f = open(URANDOM, O_RDONLY);
if (f < 0) {
r = -errno;
connman_warn("Could not open "URANDOM);
srandom(time(NULL));
} else {
uint64_t val;
r = __connman_util_get_random(&val);
if (r < 0)
srandom(time(NULL));
else
srandom(val);
}
return r;
}
void __connman_util_cleanup(void)
{
if (f >= 0)
close(f);
f = -1;
}
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