gen_eth_addr.c 1.5 KB

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  1. /*
  2. * (C) Copyright 2001
  3. * Murray Jensen <Murray.Jensen@cmst.csiro.au>
  4. *
  5. * See file CREDITS for list of people who contributed to this
  6. * project.
  7. *
  8. * This program is free software; you can redistribute it and/or
  9. * modify it under the terms of the GNU General Public License as
  10. * published by the Free Software Foundation; either version 2 of
  11. * the License, or (at your option) any later version.
  12. *
  13. * This program is distributed in the hope that it will be useful,
  14. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16. * GNU General Public License for more details.
  17. *
  18. * You should have received a copy of the GNU General Public License
  19. * along with this program; if not, write to the Free Software
  20. * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21. * MA 02111-1307 USA
  22. */
  23. #include <stdio.h>
  24. #include <stdlib.h>
  25. #include <unistd.h>
  26. #include <time.h>
  27. int
  28. main(int argc, char *argv[])
  29. {
  30. unsigned long ethaddr_low, ethaddr_high;
  31. srand(time(0) | getpid());
  32. /*
  33. * setting the 2nd LSB in the most significant byte of
  34. * the address makes it a locally administered ethernet
  35. * address
  36. */
  37. ethaddr_high = (rand() & 0xfeff) | 0x0200;
  38. ethaddr_low = rand();
  39. printf("%02lx:%02lx:%02lx:%02lx:%02lx:%02lx\n",
  40. ethaddr_high >> 8, ethaddr_high & 0xff,
  41. ethaddr_low >> 24, (ethaddr_low >> 16) & 0xff,
  42. (ethaddr_low >> 8) & 0xff, ethaddr_low & 0xff);
  43. return (0);
  44. }