[offlineimap] open_socket() leaks DNS requests when proxying (#189)

[mitzip]

socks.setdefaultproxy() has a fourth arg for sending DNS requests through the proxy
https://github.com/OfflineIMAP/offlineimap/blob/master/offlineimap/imapserver.py#L119

However, even with that fourth arg set to True, using getaddrinfo() bypasses SOCKS5 proxy for dns resolution. This also breaks .onion Tor hidden service resolution.
https://github.com/OfflineIMAP/offlineimap/blob/master/offlineimap/imaplibutil.py#L77

Might consider socks.wrapmodule().
https://github.com/Anorov/PySocks/search?utf8=%E2%9C%93&q=wrap

ping @xiaket

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Reply to this email directly or view it on GitHub:
https://github.com/OfflineIMAP/offlineimap/issues/189
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