Ruby でハ?ケットハ?`サを恬ろう
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Ruby の BinData gem を聞ってパケットパ`サ?ジェネレ`タを恬る圭隈を LLDP を箭にh苧します。
![Lldp.new(:destination_mac
=> [0x11, 0x22, ...], ...)
# vs.
Lldp.new(:destination_mac
=> "11:22:33:44:55:66", ...)
どちらが聞いやすい?](https://image.slidesharecdn.com/random-130727021857-phpapp02/85/Ruby-31-320.jpg)
![describe OptionalTlv do
subject { OptionalTlv.read( data ) }
context "when parsing End Of LLDPDU TLV" do
let( :data ) { [ 0x00, 0x00 ].pack( "C*" ) }
its( :tlv_type ) { should eq 0 }
its( :tlv_info_length ) { should eq 0 }
its( :tlv_value ) { should eq "tlv_info_string" => "" }
end
...
RSpec でテスト
ここまでやれば匯瞳](https://image.slidesharecdn.com/random-130727021857-phpapp02/85/Ruby-34-320.jpg)
Ruby でハ?ケットハ?`サを恬ろう
- 10. class Lldp < BinData::Record mac_address :destination_mac mac_address :source_mac uint16 :ether_type, ... chassis_id_tlv :chassis_id port_id_tlv :port_id ttl_tlv :ttl, ... array :optional_tlv, ...
- 11. # ロ`ド require ＾lldp￣ # LLDPのパ`ス Lldp.read(packet_in.data).dpid #=> 12345 # 伏撹 lldp = Lldp.new(:destination_mac => ..., :source_mac => ...) # 僕佚 send_packet_out(dpid, :data => lldp.to_binary, ...)
- 12. class Lldp < BinData::Record mac_address :destination_mac mac_address :source_mac uint16 :ether_type, ... chassis_id_tlv :chassis_id port_id_tlv :port_id ttl_tlv :ttl, ... array :optional_tlv, ... end 侏 :フィ`ルド兆
- 13. プリミティブ侏 ? string, stringz ? int8, uint16, int32be,... ? bit1, bit2, bit4_le,... ? ?oat_le, double_be,...
- 14. ユ`ザ協x侏 ? mac_address ? chassis_id_tlv ? port_id_tlv ? ttl_tlv ? optional_tlv
- 15. ボトムアップに侏を協吶
- 16. class FooBarTlv < BinData::Primitive ... bit7 :tlv_type, :value => xxx ??bit9 :tlv_info_length ??string :foobar, :read_length => :tlv_info_length
- 17. だいたいパ`スできた!
- 19. Optional TLVのN ? Port Description (4) ? System Name (5) ? System Description (6) ? System Capabilities (7) ? Management Address (8) ☆カッコ坪は TLV type の よく聞う
- 20. Optional TLV 1゛N ? Optional TLV (type = 4゛8, 0) の Array ? Array のK極は End of LLDPDU
- 22. CODE
- 23. class Lldp < BinData::Record ... array :optional_tlv, :type => :optional_tlv, :read_until => lambda { element.end_of_lldpdu? } Optional TLV End of LLDPDU でKわる Optional TLV 塘双
- 24. class OptionalTlv < BinData::Record ... bit7 :tlv_type ... def end_of_lldpdu? tlv_type == 0 end K極のチェック
- 26. class OptionalTlv < BinData::Record bit7 :tlv_type ??bit9 :tlv_info_length ??choice :tlv_value, ... :selection => :chooser do end_of_lldpdu_value 0 ????port_description_value 4 ????system_name_value 5 ????system_description_value 6 ????system_capabilities_value 7 ????management_address_value 8 ????string ＾unknown￣ end 慌宥 どれかが 秘る
- 27. ??choice :tlv_value, ... :selection => :chooser do end_of_lldpdu_value 0 ????port_description_value 4 ... string ＾unknown￣ ... def chooser ????if tlv_type == 0 or (4 <= tlv_type and tlv_type <= 8) ??????tlv_type ????else ??????"unknown" ????end ??end
- 28. class SystemNameValue < BinData::Record stringz :system_name end
- 29. すべてパ`スできた!
- 30. ちょっとひと返gで このうまさ
- 31. Lldp.new(:destination_mac => [0x11, 0x22, ...], ...) # vs. Lldp.new(:destination_mac => "11:22:33:44:55:66", ...) どちらが聞いやすい?
- 32. class MacAddress < BinData::Primitive array :octets, :type => :uint8, :initial_length => 6 def set value self.octets = value.split(/:/).collect do | each | each.hex end end 猟忖双★屁方塘双
- 33. ちゃんと 咾?
- 34. describe OptionalTlv do subject { OptionalTlv.read( data ) } context "when parsing End Of LLDPDU TLV" do let( :data ) { [ 0x00, 0x00 ].pack( "C*" ) } its( :tlv_type ) { should eq 0 } its( :tlv_info_length ) { should eq 0 } its( :tlv_value ) { should eq "tlv_info_string" => "" } end ... RSpec でテスト ここまでやれば匯瞳
- 36. ? 仝＄＄パケットをI尖するには々 ? BinData を聞えばきれいにける ? lか匯wにやりませんか!! Tremaレシピ鹿
- 37. ? pcap を鹿める繁 ? コ`ディングする繁 ? gh廠でテストする繁 慌揖_k
- 39. gemの恬宀に なろう