[tor-dev] Relay "Ping" Functionality

[Alexander Mages]

Hello Tor-Dev,

My name is Alex Mages, and I have been doing pluggable transport research
with Eugene Vasserman (CC) at Kansas State University.

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.

Any ideas, suggestions, or criticisms would be greatly appreciated.

Thanks,

Alex Mages
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