How to see how much data (in Mo for download/upload) was sent through my Tor usage?

Question

How to see how much data (in Mo for download/upload) was sent through my Tor usage? I know that tor.exe in windows says how much data was sent if the connection is re-established, but does it store it somewhere? And I don't know how to look up this in Linux (which I'm using right now).

Answer 1

This is already a built in feature in the anonymizing relay monitor (Arm) which provides real time statistics for:

1. bandwidth (upload/download), cpu and memory usage
2. relay's current configuration
3. logged events connection details (ip, hostname, fingerprint, and consensus data)
4. ...etc

(Picture above for the case of a relay, but it also works for a client)

Answer 2

It can be achieved via stem-using script. Tor itself makes some runtime data, but does not have a built-in extensive statistics module. You can regulary poll a Tor instance and collect data from running Tor instance and summarize it yourself

Answer 3

The control port provides two bits of information traffic/read and traffic/written which can be queried by the GETINFO command.

This will provide the traffic read and written by the Tor daemon since it was last launched.

The stem library provides a simple interface to the control port illustrated in this example code to fetch these two values, from this tutorial:

from stem.control import Controller

with Controller.from_port(port = 9051) as controller:
  controller.authenticate()  # provide the password here if you set one

  bytes_read = controller.get_info("traffic/read")
  bytes_written = controller.get_info("traffic/written")

  print("My Tor relay has read %s bytes and written %s." % (bytes_read, bytes_written))

While it explicitly states relay, which is it's example use case, this also applies to clients. The above script assumes that Tor is running a control port on 9051/tcp on localhost.