List Circuits
=============

.. image:: /_static/buttons/back.png
   :target: ../double_double_toil_and_trouble.html

Tor creates new circuits and tears down old ones on your behalf, so how can you
get information about circuits Tor currently has available?

::

  from stem import CircStatus
  from stem.control import Controller

  with Controller.from_port(port = 9051) as controller:
    controller.authenticate()

    for circ in sorted(controller.get_circuits()):
      if circ.status != CircStatus.BUILT:
        continue

      print
      print "Circuit %s (%s)" % (circ.id, circ.purpose)

      for i, entry in enumerate(circ.path):
        div = '+' if (i == len(circ.path) - 1) else '|'
        fingerprint, nickname = entry

        desc = controller.get_network_status(fingerprint, None)
        address = desc.address if desc else 'unknown'

        print " %s- %s (%s, %s)" % (div, fingerprint, nickname, address)

::

  % python list_circuits.py 

  Circuit 4 (GENERAL)
   |- B1FA7D51B8B6F0CB585D944F450E7C06EDE7E44C (ByTORAndTheSnowDog, 173.209.180.61)
   |- 0DD9935C5E939CFA1E07B8DDA6D91C1A2A9D9338 (afo02, 87.238.194.176)
   +- DB3B1CFBD3E4D97B84B548ADD5B9A31451EEC4CC (edwardsnowden3, 109.163.234.10)

  Circuit 6 (GENERAL)
   |- B1FA7D51B8B6F0CB585D944F450E7C06EDE7E44C (ByTORAndTheSnowDog, 173.209.180.61)
   |- EC01CB4766BADC1611678555CE793F2A7EB2D723 (sprockets, 46.165.197.96)
   +- 9EA317EECA56BDF30CAEB208A253FB456EDAB1A0 (bolobolo1, 96.47.226.20)

  Circuit 10 (GENERAL)
   |- B1FA7D51B8B6F0CB585D944F450E7C06EDE7E44C (ByTORAndTheSnowDog, 173.209.180.61)
   |- 00C2C2A16AEDB51D5E5FB7D6168FC66B343D822F (ph3x, 86.59.119.83)
   +- 65242C91BFF30F165DA4D132C81A9EBA94B71D62 (torexit16, 176.67.169.171)

