1 /* 2 * (C) Copyright 2001 3 * Murray Jensen <Murray.Jensen@cmst.csiro.au> 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #include <stdio.h> 9 #include <stdlib.h> 10 #include <unistd.h> 11 #include <time.h> 12 13 int 14 main(int argc, char *argv[]) 15 { 16 unsigned long ethaddr_low, ethaddr_high; 17 18 srand(time(0) | getpid()); 19 20 /* 21 * setting the 2nd LSB in the most significant byte of 22 * the address makes it a locally administered ethernet 23 * address 24 */ 25 ethaddr_high = (rand() & 0xfeff) | 0x0200; 26 ethaddr_low = rand(); 27 28 printf("%02lx:%02lx:%02lx:%02lx:%02lx:%02lx\n", 29 ethaddr_high >> 8, ethaddr_high & 0xff, 30 ethaddr_low >> 24, (ethaddr_low >> 16) & 0xff, 31 (ethaddr_low >> 8) & 0xff, ethaddr_low & 0xff); 32 33 return (0); 34 } 35