This test makes use of DNSOverride and the new verifying milter to
ensure that signatures can be verified properly.
It doesn't test the actual interaction with the public DNS, but
getting that kind of test to work on arbitrary platforms might be more
trouble than it's worth.
I note that the DNSOverride only works as long as testkey.dns is a
single line, which is fine for ed25519, but maybe not for RSA.
If a string-based configuation entry had whitespace in it, it would be
reassembled via a round-trip through the python interpreter, resulting
in a line like this:
PidFile /home/dkimpy-milter/pid file
produces a string like "['/home/dkimpy-milter/pid', 'file']", which is
clearly wrong.
I don't want to encourage people to use paths or other strings with
whitespace in them, but if we're going to fail on them we should be
failing explicitly, not doing a weird transformation that will just
break.
This is concretely useful for the DNSOverride mechanism, which is
where i ran into the problem when trying to set up testing that could
work without setting up an emulated DNS system.
Without this fix, a verifying dkimpy-milter that has no explicit
AuthservID produces the following crashing behavior as it tries to
create the authres header:
Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/Milter/__init__.py", line 772, in <lambda>
milter.set_eom_callback(lambda ctx: ctx.getpriv().eom())
File "…/dkimpy_milter/__init__.py", line 199, in eom
h = fold(str(h))
File "/usr/lib/python2.7/dist-packages/authres/core.py", line 476, in __str__
return ''.join((self.HEADER_FIELD_NAME, ': ', self.header_value()))
File "/usr/lib/python2.7/dist-packages/authres/core.py", line 496, in header_value
return ''.join(strs)
Avoid failing to chown non-existent Unix-domain sockets
Changing ownership of sockets that doesn't exist isn't a great
practice.
A better approach would be to apply os.chown() to the file descriptor
of the open socket, but at the very least dkimpy-milter shouldn't
crash the way it currently does if the socket isn't already present.
