125 lines
4.0 KiB
Ruby
125 lines
4.0 KiB
Ruby
# $Id: vtp.rb 127 2009-11-29 01:30:46Z 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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# VLAN Trunking Protocol (VTP)
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# http://en.wikipedia.org/wiki/VLAN_Trunking_Protocol
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# http://www.cisco.com/en/US/tech/tk389/tk689/technologies_tech_note09186a0080094c52.shtml
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# This is just a base class from which all VTP messages inherit and should never be used directly
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class VTPGeneric < RacketPart
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# VTP version (1-3)
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unsigned :version, 8
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# Message code (summary advertisement, subset advertisement, advertisement request, VTP join)
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unsigned :code, 8
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# Sometimes used, sometimes not, depends on the type
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unsigned :reserved, 8
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# Length of the management domain
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unsigned :domain_length, 8
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# management domain name, zero padded to 32 bytes
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text :domain, 256
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# Adjust +domain_length+ and +domain+ accordingly prior to sending
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def fix!
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self.domain_length = self.domain.length
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self.domain = self.domain.ljust(32, "\x00")
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end
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end
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# A raw VTP message
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class VTPRaw < VTPGeneric
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rest :payload
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end
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class VTPSubsetAdvertisement < VTPGeneric
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# Configuration revision
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unsigned :revision, 32
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# all of the vlan info fields
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rest :payload
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def add_vlan_info(status, type, id, mtu, index, name)
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name_length = name.length
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# zero pad name to a multiple of 4 bytes
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name = name.length % 4 == 0 ? name : name.ljust(name.length + (4 - (name.length % 4)), "\x00")
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length = 12 + name.length
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@vlan_info << [length, status, type, name_length, id, mtu, index, name]
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end
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def fix!
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@vlan_info.each do |v|
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self.payload += v.pack("CCCCnnNa*")
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end
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super
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end
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def initialize(*args)
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@vlan_info = []
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super(*args)
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self.code = 2
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end
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end
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class VTPSummaryAdvertisement < VTPGeneric
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# Configuration revision number
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unsigned :revision, 32
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# Updater identity (IP)
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octets :updater, 32
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# update timestamp
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unsigned :timestamp, 96
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# MD5 digest of VTP password
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text :md5, 128
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rest :payload
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def initialize(*args)
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super(*args)
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self.code = 1
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end
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end
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class VTPAdvertisementRequest < VTPGeneric
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# This is used in cases in which there are several subset advertisements. If the first (n) subset advertisement has been received and the subsequent one (n+1) has not been received, the Catalyst only requests advertisements from the (n+1)th one.
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unsigned :start, 32
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rest :payload
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def initialize(*args)
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super(*args)
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self.code = 3
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end
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end
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class VTPJoin < VTPGeneric
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def initialize(*args)
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super(*args)
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self.code = 4
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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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