Correct and enhance the behaviour of "internal" session caching as it
relates to SSL_CTX flags and the use of "external" session caching. The existing flag, "SSL_SESS_CACHE_NO_INTERNAL_LOOKUP" remains but is supplemented with a complimentary flag, "SSL_SESS_CACHE_NO_INTERNAL_STORE". The bitwise OR of the two flags is also defined as "SSL_SESS_CACHE_NO_INTERNAL" and is the flag that should be used by most applications wanting to implement session caching *entirely* by its own provided callbacks. As the documented behaviour contradicted actual behaviour up until recently, and since that point behaviour has itself been inconsistent anyway, this change should not introduce any compatibility problems. I've adjusted the relevant documentation to elaborate about how this works. Kudos to "Nadav Har'El" <nyh@math.technion.ac.il> for diagnosing these anomalies and testing this patch for correctness. PR: 311
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