gen_eth_addr.c 747 Bytes
Newer Older
wdenk's avatar
wdenk committed
1 2 3 4
/*
 * (C) Copyright 2001
 * Murray Jensen <Murray.Jensen@cmst.csiro.au>
 *
5
 * SPDX-License-Identifier:	GPL-2.0+
wdenk's avatar
wdenk committed
6 7 8 9 10 11 12 13 14 15 16 17
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>

int
main(int argc, char *argv[])
{
    unsigned long ethaddr_low, ethaddr_high;

18
    srand(time(0) + (getpid() << 8));
wdenk's avatar
wdenk committed
19 20 21 22 23 24

    /*
     * setting the 2nd LSB in the most significant byte of
     * the address makes it a locally administered ethernet
     * address
     */
25 26
    ethaddr_high = (rand() & 0xfeff) | 0x0200;
    ethaddr_low = rand();
wdenk's avatar
wdenk committed
27 28 29 30 31 32 33 34

    printf("%02lx:%02lx:%02lx:%02lx:%02lx:%02lx\n",
	ethaddr_high >> 8, ethaddr_high & 0xff,
	ethaddr_low >> 24, (ethaddr_low >> 16) & 0xff,
	(ethaddr_low >> 8) & 0xff, ethaddr_low & 0xff);

    return (0);
}