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+.\"	$OpenBSD: SSL_get_session.3,v 1.9 2025/06/08 22:52:00 schwarze Exp $
+.\"	OpenSSL b97fdb57 Nov 11 09:33:09 2016 +0100
+.\"
+.\" This file was written by Lutz Jaenicke <jaenicke@openssl.org>.
+.\" Copyright (c) 2000, 2001, 2005, 2013, 2016 The OpenSSL Project.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\"
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\"
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in
+.\"    the documentation and/or other materials provided with the
+.\"    distribution.
+.\"
+.\" 3. All advertising materials mentioning features or use of this
+.\"    software must display the following acknowledgment:
+.\"    "This product includes software developed by the OpenSSL Project
+.\"    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
+.\"
+.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+.\"    endorse or promote products derived from this software without
+.\"    prior written permission. For written permission, please contact
+.\"    openssl-core@openssl.org.
+.\"
+.\" 5. Products derived from this software may not be called "OpenSSL"
+.\"    nor may "OpenSSL" appear in their names without prior written
+.\"    permission of the OpenSSL Project.
+.\"
+.\" 6. Redistributions of any form whatsoever must retain the following
+.\"    acknowledgment:
+.\"    "This product includes software developed by the OpenSSL Project
+.\"    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+.\" OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd $Mdocdate: June 8 2025 $
+.Dt SSL_GET_SESSION 3
+.Os
+.Sh NAME
+.Nm SSL_get_session ,
+.Nm SSL_get0_session ,
+.Nm SSL_get1_session
+.Nd retrieve TLS/SSL session data
+.Sh SYNOPSIS
+.Lb libssl libcrypto
+.In openssl/ssl.h
+.Ft SSL_SESSION *
+.Fn SSL_get_session "const SSL *ssl"
+.Ft SSL_SESSION *
+.Fn SSL_get0_session "const SSL *ssl"
+.Ft SSL_SESSION *
+.Fn SSL_get1_session "SSL *ssl"
+.Sh DESCRIPTION
+.Fn SSL_get_session
+returns a pointer to the
+.Vt SSL_SESSION
+actually used in
+.Fa ssl .
+The reference count of the
+.Vt SSL_SESSION
+is not incremented, so that the pointer can become invalid by other operations.
+.Pp
+.Fn SSL_get0_session
+is the same as
+.Fn SSL_get_session .
+.Pp
+.Fn SSL_get1_session
+is the same as
+.Fn SSL_get_session ,
+but the reference count of the
+.Vt SSL_SESSION
+is incremented by one.
+.Pp
+The
+.Fa ssl
+session contains all information required to re-establish the connection
+without a new handshake.
+.Pp
+.Fn SSL_get0_session
+returns a pointer to the actual session.
+As the reference counter is not incremented,
+the pointer is only valid while the connection is in use.
+If
+.Xr SSL_clear 3
+or
+.Xr SSL_free 3
+is called, the session may be removed completely (if considered bad),
+and the pointer obtained will become invalid.
+Even if the session is valid,
+it can be removed at any time due to timeout during
+.Xr SSL_CTX_flush_sessions 3 .
+.Pp
+If the data is to be kept,
+.Fn SSL_get1_session
+will increment the reference count, so that the session will not be implicitly
+removed by other operations but stays in memory.
+In order to remove the session,
+.Xr SSL_SESSION_free 3
+must be explicitly called once to decrement the reference count again.
+.Pp
+.Vt SSL_SESSION
+objects keep internal link information about the session cache list when being
+inserted into one
+.Vt SSL_CTX
+object's session cache.
+One
+.Vt SSL_SESSION
+object, regardless of its reference count, must therefore only be used with one
+.Vt SSL_CTX
+object (and the
+.Vt SSL
+objects created from this
+.Vt SSL_CTX
+object).
+.Sh RETURN VALUES
+The following return values can occur:
+.Bl -tag -width Ds
+.It Dv NULL
+There is no session available in
+.Fa ssl .
+.It Pointer to an Vt SSL_SESSION
+The return value points to the data of an
+.Vt SSL
+session.
+.El
+.Sh SEE ALSO
+.Xr ssl 3 ,
+.Xr SSL_clear 3 ,
+.Xr SSL_free 3 ,
+.Xr SSL_SESSION_free 3 ,
+.Xr SSL_SESSION_get0_peer 3 ,
+.Xr SSL_SESSION_get_compress_id 3 ,
+.Xr SSL_SESSION_get_id 3 ,
+.Xr SSL_SESSION_get_protocol_version 3 ,
+.Xr SSL_SESSION_get_time 3 ,
+.Xr SSL_SESSION_new 3 ,
+.Xr SSL_SESSION_print 3 ,
+.Xr SSL_set_session 3
+.Sh HISTORY
+.Fn SSL_get_session
+first appeared in SSLeay 0.5.2 and has been available since
+.Ox 2.4 .
+.Pp
+.Fn SSL_get0_session
+and
+.Fn SSL_get1_session
+first appeared in OpenSSL 0.9.5 and have been available since
+.Ox 2.7 .