111 lines
3.5 KiB
Ruby
111 lines
3.5 KiB
Ruby
# $Id: dns.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 L5
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# Domain Name System
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class DNS < RacketPart
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# Transaction ID
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unsigned :tx_id, 16
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# Response
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unsigned :response, 1
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# Opcode
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unsigned :opcode, 4
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# Authoritative?
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unsigned :authoritative, 1
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# Truncated?
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unsigned :truncated, 1
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# Recursion Desired?
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unsigned :recursion_d, 1
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# Recursion Available?
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unsigned :recursion_a, 1
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# Reserved
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unsigned :reserved, 1
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# Answer authenticated?
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unsigned :auth, 1
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# Non-authenticated data OK?
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unsigned :nonauth, 1
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# Reply Code
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unsigned :reply_code, 4
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# Number of questions
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unsigned :question_rr, 16
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# Number of answer RR
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unsigned :answer_rr, 16
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# Number of authority RR
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unsigned :authority_rr, 16
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# Number of additional RR
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unsigned :additional_rr, 16
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rest :payload
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def initialize(*args)
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super
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end
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# Add an additional record. Automatically increases +additional_rr+
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def add_additional(name, type, klass)
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self.payload += self.add_record(name, type, klass).encode
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self.additional_rr += 1
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end
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# Add an answer record. Automatically increases +answer_rr+
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def add_answer(name, type, klass)
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self.payload += self.add_record(name, type, klass).encode
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self.answer_rr += 1
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end
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# Add an authority record. Automatically increases +authority_rr+
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# XXX: broken. authns records are much more complicated than this.
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def add_authority(name, type, klass)
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self.payload += self.add_record(name, type, klass).encode
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self.authority_rr += 1
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end
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# Add a question record. Automatically increases +question_rr+
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def add_question(name, type, klass)
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self.payload += add_record(name, type, klass).encode
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self.question_rr += 1
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end
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private
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def add_record(name, type, klass)
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q = Misc::VT.new(2,2)
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name.split(/\./).each do |p|
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lv = Misc::LV.new(1)
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lv.values << p
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lv.lengths << p.length
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q.value << lv.encode
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end
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q.types << type
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q.types << klass
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q
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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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