Update smbserver.py and negtelnetserver.py to be compatible with
Python 3 while staying backwards-compatible to support Python 2.
Fix string encoding and handling of echoed and transferred data.
Tested with both Python 2.7.17 and Python 3.7.7
Reported-by: Daniel Stenberg
Assisted-by: Kamil Dudka
Reviewed-by: Marcel Raad
Fixes#5104Closes#5110
Users of the SMB tests will have to install impacket manually.
Reasoning: our in-tree version of impacket was quite outdated
and only compatible with Python 2 which is already end-of-life.
Upgrading to Python 3 and a compatible impacket version would
require to import additional Python-only and CPython-extension
dependencies. This would have hindered portability enormously.
Closes#5094
Even though the existing code can be fixed to run on Python 3, the
tests will fail due to the Unicode transition the protocol is invalid.
Follow up to ee63837Closes#5085
smbserver.py/dictserver.py were explicitly using localhost/127.0.0.1 for
binding the server which when we were running the tests with a separate
HOSTIP and CLIENTIP had failures verifying the server from the device we
were testing.
This changes them to take the address from runtests.py and default to
localhost/127.0.0.1 if none is given.
Closes#4048
