64 lines
2.4 KiB
Ruby
64 lines
2.4 KiB
Ruby
# $Id: arp.rb 14 2008-03-02 05:42:30Z warchild $
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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 L3
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# Address Resolution Protocol: ARP
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# RFC826 (http://www.faqs.org/rfcs/rfc826.html)
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class ARP < RacketPart
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ARPOP_REQUEST = 0x0001
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ARPOP_REPLY = 0x0002
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# Hardware type
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unsigned :htype, 16, { :default => 1 }
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# Protocol type
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unsigned :ptype, 16, { :default => 0x0800 }
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# Hardware address length
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unsigned :hlen, 8, { :default => 6 }
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# Protocol address length
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unsigned :plen, 8, { :default => 4 }
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# Opcode
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unsigned :opcode, 16
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# XXX: This is not entirely correct. Technically, sha, spa, tha and
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# tpa should be sized according to hlen and plen. This is good enough for
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# Ethernet and IPv4.
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# Source hardware address
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hex_octets :sha, 48
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# Source protocol address
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octets :spa, 32
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# Target hardware address
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hex_octets :tha, 48
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# Target protcol address
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octets :tpa, 32
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# Payload
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rest :payload
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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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