metasploit-framework/lib/racket/misc.rb

# $Id: misc.rb 14 2008-03-02 05:42:30Z warchild $
#
# Copyright (c) 2008, Jon Hart 
# All rights reserved.
# 
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#     * Redistributions of source code must retain the above copyright
#       notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above copyright
#       notice, this list of conditions and the following disclaimer in the
#       documentation and/or other materials provided with the distribution.
#     * Neither the name of the <organization> nor the
#       names of its contributors may be used to endorse or promote products
#       derived from this software without specific prior written permission.
# 
# THIS SOFTWARE IS PROVIDED BY Jon Hart ``AS IS'' AND ANY
# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL Jon Hart BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
module Racket
module Misc
  # Return a number that is at most size bits long
  def Misc.randbits(size)
    bits = 0
    srand Time.now.usec
    0.upto(size-1) {
      bits <<= 1
      bits |= rand(2)
    }
    bits
  end

  # Return a byte that is at most size bytes long
  def Misc.randbytes(size)
    bytes = 0
    0.upto(size-1) {
      bytes <<= 8
      bytes |= randbits(8)
    }
    bytes
  end

  # Return a string that is at most size characters long
  def Misc.randstring(size)
    s = ""
    0.upto(size-1) {
      s += sprintf("%c", randbytes(1))
    }
    s
  end

  # given a long representing a MAC address
  # print it out in human readable form
  def Misc.macaddr(long)
    long.to_s(16).rjust(12, '0').unpack("a2a2a2a2a2a2").join(":")
  end


end
end
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