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