[tor-dev] Relay "Ping" Functionality

[Alexander Mages]

I appreciate all the suggestions!

Thanks,
Alex


On Sat, Feb 12, 2022 at 3:59 AM <r.a at posteo.net> wrote:

> Hey,
>
> On 21.01.22 14:57, Alexander Mages wrote:
> > Right now we're exploring latency-based attacks but are having trouble
> > achieving a particular goal: a way to “ping” an arbitrary node in a
> > client’s already-built (“live”) circuit. One-way timing is ideal but
> > round trip time would suffice. We can glean this information during
> > circuit construction, but what about a “live” circuit? Ideally, this
> > would be a periodic thing Tor already keeps track of, but as an
> > on-demand or as a byproduct/side-effect of a different function would
> > also work. We have not been able to find a way to do this within the Tor
> > (sub)protocol specs or the control port spec.
>
>
> You can measure the RTT between your client and a node by exiting
> through that node and intentionally violating its exit policy, such as
> connecting to 127.0.0.1:80. The node will return an error, and you can
> measure the RTT as the time between sending the request and receiving
> the error. See https://naviga-tor.github.io/ for an example.
>
>
> All the best,
> Robert
>
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