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vMAC-Generator.md

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Different implementations for virtual MAC address generator

Bash - macgen.sh

#!/bin/bash
echo 0x00 0x16 0x3e $(($RANDOM%128)) $(($RANDOM%256)) $(($RANDOM%256)) | awk '{ i=1 ; while (i < NF) {printf("%02x:",$i); i++}} { printf "%02x\n", $NF }'

Output:

./macgen.sh
00:16:3e:0e:d2:5a

AWK - macgen.awk

#!/usr//bin/awk -f

function randint(n) { return 1 + int(rand() * n)}
BEGIN { 
  a="00"; b="16"; c="3e"
  srand()
  d=randint(127)
  srand(d)
  e=randint(255)
  srand()
  f=randint(255)

  printf("%s:%s:%s:%02x:%02x:%02x\n", a,b,c,d,e,f)
}

Output

./macgen.awk
00:16:3e:17:b3:2d

Python3 - macgen.py

#!/usr/bin/env python3
import random

def randomMAC():
	mac = [ 0x00, 0x16, 0x3e,
		random.randint(0x00, 0x7f),
		random.randint(0x00,0xff),
		random.randint(0x00,0xff)]
	return ':'.join(map(lambda x: '%02x' % x, mac))

print(randomMAC())

Output

./macgen.py 
00:16:3e:21:51:1b

Ruby - macgen.rb

#!/usr/bin/env ruby

def randomMAC
  mac = [0x00, 0x16, 0x3e,
    Random.rand(0x00..0x7f),
    Random.rand(0x00..0xff),
    Random.rand(0x00..0xff)]
    
    mac.map { |x| '%02x' % x }.join(':')
end

puts randomMAC

Output

./macgen.rb
00:16:3e:19:80:c4

Format string - '%02x'
% -- format tag
x -- return hexadecimal
02 -- set at lease 2 digits, use 0 to pad it to length