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PacketFu::TcpOption::TS

Timestamp option

www.networksorcery.com/enp/protocol/tcp/option008.htm

Public Class Methods

new(args={}) click to toggle source
# File lib/packetfu/protos/tcp/option.rb, line 287
def initialize(args={})
  super(
    args.merge(:kind => 8,
               :optlen => 10
              )
  )
  self[:value] = StructFu::String.new.read(args[:value] || "\x00" * 8) 
end

Public Instance Methods

decode() click to toggle source

TS options with lengths other than 10 are malformed.

# File lib/packetfu/protos/tcp/option.rb, line 297
def decode
  if self[:optlen].to_i == 10
    val1,val2 = self[:value].unpack("NN")
    "TS:#{val1};#{val2}"
  else
    "TS-bad:#{self[:value]}"
  end
end
encode(str) click to toggle source

TS options are in the format of "TS:[timestamp value];[timestamp secret]" Both should be written as decimal numbers.

# File lib/packetfu/protos/tcp/option.rb, line 308
def encode(str)
  if str =~ /^([0-9]+);([0-9]+)$/
    tsval,tsecr = str.split(";").map {|x| x.to_i}
    if tsval <= 0xffffffff && tsecr <= 0xffffffff
      self[:value] = StructFu::String.new([tsval,tsecr].pack("NN"))
    else
      self[:value] = StructFu::String.new(str)
    end
  else
    self[:value] = StructFu::String.new(str)
  end
end

[Validate]

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