On Mon, Feb 18, 2019 at 1:04 PM Piyush Kumar Sharma piyushs@iiitd.ac.in wrote:
Hello all,
I am a PhD student, and am working on some measurements in Tor. I am stuck at a point where i need to send multiple applications(streams) traffic through a single circuit. I am currently using torsocks/torify to send traffic of these multiple applications through Tor. The main problem is that, despite trying many different ways to achieve the same (sending multiple streams through a single circuit), i am not successful.
Things i have tried : 1.) Force Tor process to create only a single circuit at a time preventing any new circuit creation, so that any new stream would be attached to this only available circuit. To acheive this i have set the following Tor options : set __DisablePredictedCircuits to 1 set MaxClientCircuitsPending to 1 set newcircuitperiod to 999999999 set maxcircuitdirtiness to 999999999 The problem with the above method is that it seems to work sometimes randomly. But most of the times for some reason, a new circuit is still created.
2.) Next, i assumed that maybe running torify multiple times for each application is the culprit, as it may try to create new circuit for each run. So i created a new bidirectional stream using socat, which listens on a local TCP port, and forwards the data to the Tor SOCKS port assuming that it will lead to a singe connection to local SOCKS. Even this did not work and still new circuits were created randomly.
3.) Next i tried to attach streams to circuits manually, using the stem library following the link : https://stem.torproject.org/tutorials/to_russia_with_love.html#custom-path-s... . This seemed to work initially, but then after every 4-5 runs, the streams seemed to detach automatically. Moreover, the original circuit crashed too.
The stem approach (#3) ought to work in general -- the information here isn't enough to tell what the problem is, exactly. Is it possible that the circuit you are constructing is failing for some reason?