Class: FingerPoken::Target

Inherits:
Object
  • Object
show all
Defined in:
lib/fingerpoken/target.rb

Direct Known Subclasses

Tivo, VNC, Xdo

Instance Method Summary collapse

Constructor Details

#initialize(config) ⇒ Target

Returns a new instance of Target.



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# File 'lib/fingerpoken/target.rb', line 6

def initialize(config)
  @channel = config[:channel]
  @logger = Logger.new(STDERR)
  @logger.level = ($DEBUG ? Logger::DEBUG: Logger::WARN)
  @passphrase = config[:passphrase] # OK if this is nil

  @last_sequence = -1
end

Instance Method Details

#click(button) ⇒ Object 



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# File 'lib/fingerpoken/target.rb', line 105

def click(button)
  mousedown(button)
  mouseup(button)
end

#keydown(key) ⇒ Object 



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# File 'lib/fingerpoken/target.rb', line 118

def keydown(key)
  @logger.info("keydown not supported")
end

#keypress(key) ⇒ Object 



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# File 'lib/fingerpoken/target.rb', line 114

def keypress(key)
  @logger.info("keypress not supported")
end

#keyup(key) ⇒ Object 



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# File 'lib/fingerpoken/target.rb', line 122

def keyup(key)
  @logger.info("keyup not supported")
end

#mousedown(button) ⇒ Object 



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# File 'lib/fingerpoken/target.rb', line 97

def mousedown(button)
  @logger.info("mousedown not supported")
end

#mousemove_relative(x, y) ⇒ Object

Subclasses should implement this.



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# File 'lib/fingerpoken/target.rb', line 93

def mousemove_relative(x, y)
  @logger.info("mousemove not supported")
end

#mouseup(button) ⇒ Object 



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# File 'lib/fingerpoken/target.rb', line 101

def mouseup(button)
  @logger.info("mouseup not supported")
end

#move_end ⇒ Object 



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# File 'lib/fingerpoken/target.rb', line 126

def move_end()
  @logger.info("move_end not supported")
end

#register ⇒ Object

def verify



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# File 'lib/fingerpoken/target.rb', line 42

def register
  if @registered
    @logger.warn("Ignoring extra call to #{self.class.name}#register. Trace:\n#{caller[0..3].join("\n")}")
    return
  end

  @registered = true
  @logger.debug(:register => self.class.name)
  @channel.subscribe do |obj|
    request = obj[:request]
    callback = obj[:callback]
    @logger.debug(:request => request)

    if @passphrase
      verified = verify(request, callback)
      if !verified
        @logger.warn("Dropping corrupt/forged request")
        next
      end
    end

    @last_sequence = request["sequence"].to_i

    response = case request["action"]
      when "mousemove_relative"
        mousemove_relative(request["rel_x"], request["rel_y"])
      when "mousemove_absolute"
        mousemove_absolute(request["percent_x"], request["percent_y"])
      when "move_end"
        move_end()
      when "click"
        click(request["button"])
      when "mousedown"
        mousedown(request["button"])
      when "mouseup"
        mouseup(request["button"])
      when "type"
        type(request["string"])
      when "keypress"
        keypress(request["key"])
      else
        p ["Unsupported action", request]
    end

    if response.is_a?(Hash)
      callback.call(response)
    end
  end # @channel.subscribe
end

#type(string) ⇒ Object 



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# File 'lib/fingerpoken/target.rb', line 110

def type(string)
  @logger.info("typing not supported")
end

#verify(request, callback) ⇒ Object 



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# File 'lib/fingerpoken/target.rb', line 15

def verify(request, callback)
  if !request["signature"]
    # TODO(sissel): Send callback saying "passphrase required"
    @logger.warn("Message with no signature")
    return false
  end

  if request["sequence"] < @last_sequence
    # Reject out of sequence or replayed messages
    # TODO(sissel): Report replay attack detected
    @logger.warn("Sequence #{request["sequence"]} < #{@last_sequence} "\
                 "(last sequence). Replay attack or bug?")
    return false
  end

  hmac = HMAC::MD5.new(@passphrase)
  hmac.update(request["sequence"].to_s)
  digest_bytes = hmac.digest.bytes.to_a
  if request["signature"] == digest_bytes
    return true
  else
    # TODO(sissel): Report verification failed
    @logger.warn("Signature verify failed. Server:#{digest_bytes.inspect}, Client:#{request["signature"].inspect}")
    return false
  end
end