68 lines
2.5 KiB
Ruby
68 lines
2.5 KiB
Ruby
# $Id: misc.rb 142 2009-12-13 01:53:14Z jhart $
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#
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# Copyright (c) 2008, Jon Hart
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# * Neither the name of the <organization> nor the
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# names of its contributors may be used to endorse or promote products
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# derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY Jon Hart ``AS IS'' AND ANY
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# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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# DISCLAIMED. IN NO EVENT SHALL Jon Hart BE LIABLE FOR ANY
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# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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module Racket
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module L2
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# Miscelaneous L2 helper methods
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module Misc
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# given a string representing a MAC address, return the
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# human readable form
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def Misc.string2mac(string)
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string.unpack("C*").map { |i| i.to_s(16).ljust(2,"0") }.join(":")
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end
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# given a MAC address, return the string representation
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def Misc.mac2string(mac)
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mac.split(":").map { |i| i.hex.chr }.join
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end
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# given a MAC address, return the long representation
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def Misc.mac2long(addr)
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long = 0
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addr.split(':').map { |s| s.to_i(16) }.each do |o|
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long = (long << 8) ^ o
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end
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long
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end
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# given a long representing a MAC address
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# print it out in human readable form of a given length,
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# defaulting to 6 (ethernet)
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def Misc.long2mac(long, len=6)
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long.to_s(16).rjust(len*2, '0').unpack("a2"*len).join(":")
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end
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# Return a random MAC, defaults to 6 bytes (ethernet)
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def Misc.randommac(len=6)
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long2mac(rand(2**(8*len)), len)
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end
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end
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end
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end
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# vim: set ts=2 et sw=2:
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