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+.\" ======================================================================
+.\"
+.IX Title "SSL_CTX_SET_SESSION_CACHE_MODE 1"
+.TH SSL_CTX_SET_SESSION_CACHE_MODE 1 "perl v5.6.1" "2002-01-27" "User Contributed Perl Documentation"
+.UC
+.SH "NAME"
+SSL_CTX_set_session_cache_mode, SSL_CTX_get_session_cache_mode \- enable/disable session caching
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/ssl.h>
+.Ve
+.Vb 2
+\& long SSL_CTX_set_session_cache_mode(SSL_CTX ctx, long mode);
+\& long SSL_CTX_get_session_cache_mode(SSL_CTX ctx);
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+\&\fISSL_CTX_set_session_cache_mode()\fR enables/disables session caching
+by setting the operational mode for \fBctx\fR to <mode>.
+.PP
+\&\fISSL_CTX_get_session_cache_mode()\fR returns the currently used cache mode.
+.SH "NOTES"
+.IX Header "NOTES"
+The OpenSSL library can store/retrieve \s-1SSL/TLS\s0 sessions for later reuse.
+The sessions can be held in memory for each \fBctx\fR, if more than one
+\&\s-1SSL_CTX\s0 object is being maintained, the sessions are unique for each \s-1SSL_CTX\s0
+object.
+.PP
+In order to reuse a session, a client must send the session's id to the
+server. It can only send exactly one id.  The server then decides whether it
+agrees in reusing the session or starts the handshake for a new session.
+.PP
+A server will lookup up the session in its internal session storage. If
+the session is not found in internal storage or internal storage is
+deactivated, the server will try the external storage if available.
+.PP
+Since a client may try to reuse a session intended for use in a different
+context, the session id context must be set by the server (see
+SSL_CTX_set_session_id_context(3)).
+.PP
+The following session cache modes and modifiers are available:
+.Ip "\s-1SSL_SESS_CACHE_OFF\s0" 4
+.IX Item "SSL_SESS_CACHE_OFF"
+No session caching for client or server takes place.
+.Ip "\s-1SSL_SESS_CACHE_CLIENT\s0" 4
+.IX Item "SSL_SESS_CACHE_CLIENT"
+Client sessions are added to the session cache. As there is no reliable way
+for the OpenSSL library to know whether a session should be reused or which
+session to choose (due to the abstract \s-1BIO\s0 layer the \s-1SSL\s0 engine does not
+have details about the connection), the application must select the session
+to be reused by using the SSL_set_session(3)
+function. This option is not activated by default.
+.Ip "\s-1SSL_SESS_CACHE_SERVER\s0" 4
+.IX Item "SSL_SESS_CACHE_SERVER"
+Server sessions are added to the session cache. When a client proposes a
+session to be reused, the session is looked up in the internal session cache.
+If the session is found, the server will try to reuse the session.
+This is the default.
+.Ip "\s-1SSL_SESS_CACHE_BOTH\s0" 4
+.IX Item "SSL_SESS_CACHE_BOTH"
+Enable both \s-1SSL_SESS_CACHE_CLIENT\s0 and \s-1SSL_SESS_CACHE_SERVER\s0 at the same time.
+.Ip "\s-1SSL_SESS_CACHE_NO_AUTO_CLEAR\s0" 4
+.IX Item "SSL_SESS_CACHE_NO_AUTO_CLEAR"
+Normally the session cache is checked for expired sessions every
+255 connections using the
+SSL_CTX_flush_sessions(3) function. Since
+this may lead to a delay which cannot be controlled, the automatic
+flushing may be disabled and
+SSL_CTX_flush_sessions(3) can be called
+explicitly by the application.
+.Ip "\s-1SSL_SESS_CACHE_NO_INTERNAL_LOOKUP\s0" 4
+.IX Item "SSL_SESS_CACHE_NO_INTERNAL_LOOKUP"
+By setting this flag sessions are cached in the internal storage but
+they are not looked up automatically. If an external session cache
+is enabled, sessions are looked up in the external cache. As automatic
+lookup only applies for \s-1SSL/TLS\s0 servers, the flag has no effect on
+clients.
+.PP
+The default mode is \s-1SSL_SESS_CACHE_SERVER\s0.
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+\&\fISSL_CTX_set_session_cache_mode()\fR returns the previously set cache mode.
+.PP
+\&\fISSL_CTX_get_session_cache_mode()\fR returns the currently set cache mode.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+ssl(3), SSL_set_session(3),
+SSL_session_reused(3),
+SSL_CTX_sess_number(3),
+SSL_CTX_sess_set_cache_size(3),
+SSL_CTX_sess_set_get_cb(3),
+SSL_CTX_set_session_id_context(3),
+SSL_CTX_set_timeout(3),
+SSL_CTX_flush_sessions(3)