Instead, check io_operations.open for NULL which is the case for
"sudo -V". Also move the early return in sudoers_io_open() for
"sudo -V" until after we have initialized debugging.
so python log system can be used with sudo logsystem.
Loggers use it by default (the handler is set on the root logger).
If that is not the intent, it can be overridden explicitly.
If "ClassName" is not specified, load the one and only sudo.Plugin from
the module (if so), otherwise display which plugins are available from
which the system admin can choose.
We only want to pass the execution environment back for commands
that are accepted or rejected.
Also avoid potentially freeing the wrong pointer when garbage
collection is enabled.
This only happens when sudo unloads the last python plugin.
The reason doing so is because there are some python modules which
does not support importing them again after destroying the interpreter
which has imported them previously.
Another solution would be to just leak the interpreters (let the kernel
free up), but then there might be some python resources like open files
would not get cleaned up correctly if the plugin is badly written.
Tests are meant to test the scenario sudo does, so I have modified them
to generally do not unlink but only a few times (~per plugin type) so it
does not use 48 interpreters (one gets started on every plugin->open) and
it is visible at least which type of plugin fails deinit if there is an
error.
The python_plugin_api_rc_call function already decrements the
refcount of py_args.
Python avoids the double free, but the error gets shown if using python
debug build.
even if the arguments are not used (eg. when there is no "close" call
in the plugin).
It was not really a memleak, because interpreter is deinitialized anyway,
which frees the object.
Tests did not catch the issue where errstr was not set correctly, but
its pointer contained the expected data, because the memory allocator
reused the same space for storing the string.
Now it is either verified to be NULL, or reset to NULL.
The error is always stored in plugin_ctx, but it is only set into errstr
if the API version is enough. (Previously it worked the opposite:
we only stored the error if API level was enough.)
We need a close function to be able to to free memory allocated for
errstr. Unlike the other plugins, the close function is called
immediately after the plugin's check or show_version function.
The plugin does not remain open until the command completes.
