Module: RubyDNS::TCPHandler

Defined in:
lib/rubydns/handler.rb

Instance Method Summary collapse

Instance Method Details

#initialize(server) ⇒ Object 



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# File 'lib/rubydns/handler.rb', line 95

def initialize(server)
  @server = server
  
  @buffer = BinaryStringIO.new
  
  @length = nil
  @processed = 0
end

#receive_data(data) ⇒ Object

Receive the data via a TCP connection, process messages when we receive the indicated amount of data.



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# File 'lib/rubydns/handler.rb', line 105

def receive_data(data)
  # We buffer data until we've received the entire packet:
  @buffer.write(data)
  
  # Message includes a 16-bit length field.. we need to see if we have received it yet:
  if @length == nil
    if (@buffer.size - @processed) < 2
      raise LengthError.new("Malformed message smaller than two bytes received")
    end
    
    # Grab the length field:
    @length = @buffer.string.byteslice(@processed, 2).unpack('n')[0]
    @processed += 2
  end
  
  if (@buffer.size - @processed) >= @length
    data = @buffer.string.byteslice(@processed, @length)
    
    options = {:peer => RubyDNS::get_peer_details(self)}
    
    UDPHandler.process(@server, data, options) do |answer|
      data = answer.encode
      
      @server.logger.debug "Writing response to client (#{data.bytesize} bytes) via TCP..."
      
      self.send_data([data.bytesize].pack('n'))
      self.send_data(data)
    end
    
    @processed += @length
    @length = nil
  end
end

#unbind ⇒ Object

Check that all data received was processed.



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# File 'lib/rubydns/handler.rb', line 140

def unbind
  if @processed != @buffer.size
    raise LengthError.new("Unprocessed data remaining (#{@buffer.size - @processed} bytes unprocessed)")
  end
end