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(One represents code that I forgot to write.)
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The three arguments TorClient::bootstrap requires by way of configuration
have been factored into a new TorClientConfig object.
This object gains two associated functions: one which uses `tor_config`'s
`CfgPath` machinery to generate sane defaults for the state and cache
directories, and one that accepts said directories in order to create a
config object with those inserted.
(this commit was inspired by trying to use arti as a library and being somewhat
overwhelmed by the amount of config stuff there was to do :p)
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The previous code would report all failures to build a circuit as
failures of the guard. But of course that's not right: If we
fail to extend to the second or third hop, that might or might not
be the guard's fault.
Now we use the "pending status" feature of the GuardMonitor type so
that an early failure is attributed to the guard, but a later
failure is attributed as "Indeterminate". Only a complete circuit
is called a success. We use a new "GuardStatusHandle" type here so
that we can report the status early if there is a timeout.
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There are some limitations here, as noted in the comments.
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(When we're building a path with a guard, we need to tell the guard
manager whether the path succeeded, and we need to wait to hear
whether the guard is usable.)
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There are some missing parts here (like persistence and tests)
and some incorrect parts (I am 90% sure that the "exploratory
circuit" flag is bogus). Also it is not integrated with the circuit
manager code.
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On torspec!40, Mike says:
I don't think there is a practical difference here. As per
Section 2.4.5, if 60 seconds is not enough and causes the
liveness test to fail due to too many timeouts, we will double
the initial timeout.
This makes our behavior the same as C tor.
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The C Tor implementation doesn't do this, and Mike says:
I think it is a reasonable enough assumption that if Tor has
restarted, this kind data is no longer fresh enough to be
accurate for this purpose. This is also only 20 circuits here,
and typical timeouts are now around 1-2 seconds or less.. So a
restarted client with a timeout that is too low for a new
internet connection will figure this out pretty quickly. I think
that is OK.
(from torspec!40)
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This will cause some pain for now, but now is really the best time
to do this kind of thing.
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