Improve debug logs and fix a state fencepost error.

Make a debug log more informative.

We need to let them live long enough to perform the test.

Move a log message about scaling to after we scale

If any circuits were opened during a scaling event, we were scaling attempts
and successes by different amounts. This leads to rounding error.

The fix is to record how many circuits are in a state that hasn't been fully
counted yet, and subtract that before scaling, and add it back afterwords.

Since they use RELAY_EARLY (which can be seen by all hops on the path),
it's not safe to say they actually count as a successful use.

There are also problems with trying to allow them to finish extending due to
the circuit purpose state machine logic. It is way less complicated (and
possibly more semantically coherent) to simply wait until we actually try to
do something with them before claiming we 'used' them.

Also, we shouldn't call timed out circuits 'used' either, for semantic
consistency.

An adversary could let the first stream request succeed (ie the resolve), but
then tag and timeout the remainder (via cell dropping), forcing them on new
circuits.

Rolling back the state will cause us to probe such circuits, which should lead
to probe failures in the event of such tagging due to either unrecognized
cells coming in while we wait for the probe, or the cipher state getting out
of sync in the case of dropped cells.

Path use bias measures how often we can actually succeed using the circuits we
actually try to use. It is a subset of path bias accounting, but it is
computed as a separate statistic because the rate of client circuit use may
vary depending on use case.

You can get it back by saying ./autogen.sh -v

Patch from onizuka; for bug 4664.

This isn't a complete fix, since starting from a clean checkout still
reports that it's installing stuff

Patch from onizuka generated with

 find ./ -type f -perm -u+rw -exec sed -ri 's/(Base)-(16|32|64)/\1\2/gi' {} \;

Fixes issue 6875 on Tor.

(Pull on a thread and the whole sweater unravels.)

Fix by "ultramage".

This already has a changes entry.

This won't actually break them any worse than they were broken before:
it just removes a set of warnings that nobody was actually seeing, I
hope.

Closes 6826

Jérémy Bobbio authored 12 years ago and Nick Mathewson committed 12 years ago

The implementation is pretty straightforward: parse_extended_hostname() is
modified to drop any leading components from an address like
'foo.aaaaaaaaaaaaaaaa.onion'.

Conflicts:
	src/or/or.h
	 srcwin32/orconfig.h

Fixes bug 7305.

Fix for bug 7308

Fixes 7309

Fix for bug 7313

Fixes bugs 7312 and 7310.

Fixes bug 7669