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/*
* Copyright (C) 2012-2016 B.A.T.M.A.N. contributors:
*
* Simon Wunderlich
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License 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 Street, Fifth Floor, Boston, MA
* 02110-1301, USA
*
*/
#include <netinet/ether.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <sys/time.h>
#include <time.h>
#include "alfred.h"
int time_diff(struct timespec *tv1, struct timespec *tv2,
struct timespec *tvdiff) {
tvdiff->tv_sec = tv1->tv_sec - tv2->tv_sec;
if (tv1->tv_nsec < tv2->tv_nsec) {
tvdiff->tv_nsec = 1000000000 + tv1->tv_nsec - tv2->tv_nsec;
tvdiff->tv_sec -= 1;
} else {
tvdiff->tv_nsec = tv1->tv_nsec - tv2->tv_nsec;
}
return (tvdiff->tv_sec >= 0);
}
void time_random_seed(void)
{
struct timespec now;
uint8_t *c = (uint8_t *)&now;
size_t i;
unsigned int s = 0;
clock_gettime(CLOCK_REALTIME, &now);
for (i = 0; i < sizeof(now); i++) {
s *= 127u;
s += c[i];
}
srand(s);
}
uint16_t get_random_id(void)
{
return random();
}
bool is_valid_ether_addr(uint8_t addr[ETH_ALEN])
{
/* multicast address */
if (addr[0] & 0x01)
return false;
/* 00:00:00:00:00:00 */
if ((addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]) == 0)
return false;
return true;
}
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