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# -*- coding: binary -*-
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module Rex
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module Post
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module Meterpreter
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###
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#
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# This class is responsible for reading in and decrypting meterpreter
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# packets that arrive on a socket
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#
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###
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class PacketParser
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  #
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  # Initializes the packet parser context.
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  #
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  def initialize
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    reset
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  end
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  #
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  # Resets the parser state so that a new packet can begin being parsed.
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  #
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  def reset
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    self.packet = Packet.new(0)
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  end
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  #
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  # Reads data from the socket and parses as much of the packet as possible.
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  #
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  def recv(sock)
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    raw = nil
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    if self.packet.raw_bytes_required > 0
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      while (raw = sock.read(self.packet.raw_bytes_required))
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        self.packet.add_raw(raw)
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        break if self.packet.raw_bytes_required == 0
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      end
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    end
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    if self.packet.raw_bytes_required > 0
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      if raw == nil
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        raise EOFError
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      else
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        return nil
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      end
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    end
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    packet = self.packet
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    reset
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    packet
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  end
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protected
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  attr_accessor :cipher, :packet    # :nodoc:
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end
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end; end; end
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