LXR uboot/tools/gen_eth

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * (C) Copyright 2001
   4 * Murray Jensen <Murray.Jensen@cmst.csiro.au>
   5 */
   6
   7#include <stdio.h>
   8#include <stdlib.h>
   9#include <unistd.h>
  10#include <time.h>
  11
  12int
  13main(int argc, char *argv[])
  14{
  15    unsigned long ethaddr_low, ethaddr_high;
  16
  17    srand(time(0) + (getpid() << 8));
  18
  19    /*
  20     * setting the 2nd LSB in the most significant byte of
  21     * the address makes it a locally administered ethernet
  22     * address
  23     */
  24    ethaddr_high = (rand() & 0xfeff) | 0x0200;
  25    ethaddr_low = rand();
  26
  27    printf("%02lx:%02lx:%02lx:%02lx:%02lx:%02lx\n",
  28        ethaddr_high >> 8, ethaddr_high & 0xff,
  29        ethaddr_low >> 24, (ethaddr_low >> 16) & 0xff,
  30        (ethaddr_low >> 8) & 0xff, ethaddr_low & 0xff);
  31
  32    return (0);
  33}
  34