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.\" ========================================================================
.\"
.IX Title "SSL_SET_SESSION 3ossl"
.TH SSL_SET_SESSION 3ossl "2024-09-03" "3.1.7+quic" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH "NAME"
SSL_set_session \- set a TLS/SSL session to be used during TLS/SSL connect
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/ssl.h>
\&
\& int SSL_set_session(SSL *ssl, SSL_SESSION *session);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBSSL_set_session()\fR sets \fBsession\fR to be used when the \s-1TLS/SSL\s0 connection
is to be established. \fBSSL_set_session()\fR is only useful for \s-1TLS/SSL\s0 clients.
When the session is set, the reference count of \fBsession\fR is incremented
by 1. If the session is not reused, the reference count is decremented
again during \fBSSL_connect()\fR. Whether the session was reused can be queried
with the \fBSSL_session_reused\fR\|(3) call.
.PP
If there is already a session set inside \fBssl\fR (because it was set with
\&\fBSSL_set_session()\fR before or because the same \fBssl\fR was already used for
a connection), \fBSSL_SESSION_free()\fR will be called for that session.
This is also the case when \fBsession\fR is a \s-1NULL\s0 pointer. If that old
session is still \fBopen\fR, it is considered bad and will be removed from the
session cache (if used). A session is considered open, if \fBSSL_shutdown\fR\|(3) was
not called for the connection (or at least \fBSSL_set_shutdown\fR\|(3) was used to
set the \s-1SSL_SENT_SHUTDOWN\s0 state).
.SH "NOTES"
.IX Header "NOTES"
\&\s-1SSL_SESSION\s0 objects keep internal link information about the session cache
list, when being inserted into one \s-1SSL_CTX\s0 object's session cache.
One \s-1SSL_SESSION\s0 object, regardless of its reference count, must therefore
only be used with one \s-1SSL_CTX\s0 object (and the \s-1SSL\s0 objects created
from this \s-1SSL_CTX\s0 object).
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
The following return values can occur:
.IP "0" 4
The operation failed; check the error stack to find out the reason.
.IP "1" 4
.IX Item "1"
The operation succeeded.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBssl\fR\|(7), \fBSSL_SESSION_free\fR\|(3),
\&\fBSSL_get_session\fR\|(3),
\&\fBSSL_session_reused\fR\|(3),
\&\fBSSL_CTX_set_session_cache_mode\fR\|(3)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2000\-2022 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.