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I would like to use older mysql client but unfortunately it doesn't
understand newer authentication, so plan is to make perl proxy which
should authenticate on mysql server and then transparently pass the
traffic through client and server sockets.

Some directions would be very appreciated since I only found dbiproxy
which can be used only with DBD:roxy driver.
http://search.cpan.org/~timb/DBI-1.54/dbiproxy.PL