Previously, our code would send back an error if the socks5 request
parser said anything but DONE.  But there are other non-error cases,
like TRUNCATED: we shouldn't send back errors for them.

This patch lowers the responsibility for setting the error message
into the parsing code, since the actual type of the error message
will depend on what problem was encountered.

Fixes bug 40190; bugfix on 0.3.5.1-alpha.

Previously, hashlib.shake_256 was a class (if present); now it can
also be a function.  This change invalidated our old
compatibility/workaround code, and made one of our tests fail.

Fixes bug 40179; bugfix on 0.3.1.6-rc when the workaround code was
added.

In brief: we go through a lot of gymnastics to handle huge protover
numbers, but after years of development we're not even close to 10
for any of our current versions.  We also have a convenient
workaround available in case we ever run out of protocols: if (for
example) we someday need Link=64, we can just add Link2=0 or
something.

This patch is a minimal patch to change tor's behavior; it doesn't
take advantage of the new restrictions.

Implements #40133 and proposal 318.

David Goulet authored Jul 01, 2020 and Nick Mathewson committed Oct 07, 2020

If at least one service is configured as a version 2, a log warning is emitted
once and only once.

Closes #40003

Signed-off-by: David Goulet <dgoulet@torproject.org>

First, we introduce a flag to teach src/test/test to split its work
into chunks.  Then we replace our invocation of src/test/test in our
"make check" target with a set of 8 scripts that invoke the first
8th of the tests, the second 8th, and so on.

This change makes our "make -kj4 check" target in our hardened
gitlab build more than twice as fast, since src/test/test was taking
the longest to finish.

Closes 40098.

Fixes #40135

Signed-off-by: David Goulet <dgoulet@torproject.org>

These are:
  --disable-module-relay
  --disable-module-dirauth
  --enable-all-bugs-are-fatal
  --enable-nss

We already fixed these in #40099 and #40125.

This patch fixes #40126.  Bugfix on 0.2.8.1-alpha.

The rend_cache/entry_free was missing the rend cache allocation increment
before freeing the object.

Without it, it had an underflow bug:

  Sep 17 08:40:13.845 [warn] rend_cache_decrement_allocation(): Bug: Underflow
  in rend_cache_decrement_allocation (on Tor 0.4.5.0-alpha-dev
  7eef9ced

)

Fixes #40125

Signed-off-by: David Goulet <dgoulet@torproject.org>

Opening a new listener connection can fail in many ways like a bind()
permission denied on a low port for instance.

And thus, we should expect to handle an error when creating a new one instead
of assert() on it.

To hit the removed assert:

  ORPort 80
  KeepBindCapabilities 0

Start tor. Then edit torrc:

  ORPort <some-IP>:80

HUP tor and the assert is hit.

Fixes #40073

Signed-off-by: David Goulet <dgoulet@torproject.org>

Without this fix, running this test on its own would fail.

Fixes bug 40099. Bugfix on ade50058 in 0.2.8.1-alpha.