[issue8108] test_ftplib fails with OpenSSL 0.9.8m

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Ok, here is a patch fixing all test_ftplib failures (tested with openssl 0.9.8k and 1.0.0).
There are a couple of fixes here:
- a workaround for the strange SSL_shutdown() error return, also witnessed by LightHTTPd users (see URL in comments)
- an auto-retry for SSLSocket.unwrap() in blocking mode
- a bizarre issue in test_ftplib where DTPHandler.handle_close() gets called many times in a test (test_data_connection)

I think the SSL_shutdown() issue should be checked on the OpenSSL mailing-list.

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<http://bugs.python.org/issue8108>
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