Class: PcapTools::TcpProcessor

Inherits:
Object
  • Object
show all
Defined in:
lib/pcap_tools/packet_processors/tcp.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ TcpProcessor

Returns a new instance of TcpProcessor.



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# File 'lib/pcap_tools/packet_processors/tcp.rb', line 7

def initialize
  @streams = {}
  @stream_processors = []
end

Instance Method Details

#add_stream_processor(processor) ⇒ Object 



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# File 'lib/pcap_tools/packet_processors/tcp.rb', line 12

def add_stream_processor processor
  @stream_processors << processor
end

#finalize ⇒ Object 



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# File 'lib/pcap_tools/packet_processors/tcp.rb', line 48

def finalize
  @stream_processors.each do |p|
    p.finalize
  end
end

#inject(index, packet) ⇒ Object 



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# File 'lib/pcap_tools/packet_processors/tcp.rb', line 16

def inject index, packet
  stream_index = packet[:stream]
  if stream_index
    if packet[:tcp_flags][:syn] && packet[:tcp_flags][:ack] === false
      @streams[stream_index] = {
        :first => packet,
        :data => [],
        :tcp_lost_segment => false,
      }
    elsif packet[:tcp_flags][:fin] || packet[:tcp_flags][:rst]
      if @streams[stream_index]
        current = {:index => stream_index, :data => @streams[stream_index][:data]}
        @stream_processors.each do |p|
          current = p.process_stream current
          break unless current
        end
        @streams.delete stream_index
      end
    else
      if @streams[stream_index]
        packet[:type] = (packet[:from] == @streams[stream_index][:first][:from] && packet[:from_port] == @streams[stream_index][:first][:from_port]) ? :out : :in
        packet.delete :tcp_flags
        @streams[stream_index][:data] << packet if packet[:size] > 0
        if packet[:tcp_lost_segment]
          @streams.delete stream_index
          $stderr.puts "Ignoring tcp stream #{stream_index}, tcp segments are missing"
        end
      end
    end
  end
end