=pod
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=head1 NAME
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SSL_SESSION_get_protocol_version,
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SSL_SESSION_set_protocol_version
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- get and set the session protocol version
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=head1 SYNOPSIS
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#include <openssl/ssl.h>
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int SSL_SESSION_get_protocol_version(const SSL_SESSION *s);
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int SSL_SESSION_set_protocol_version(SSL_SESSION *s, int version);
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=head1 DESCRIPTION
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SSL_SESSION_get_protocol_version() returns the protocol version number used
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by session B<s>.
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SSL_SESSION_set_protocol_version() sets the protocol version associated with the
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SSL_SESSION object B<s> to the value B<version>. This value should be a version
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constant such as B<TLS1_3_VERSION> etc. For example, this could be used to set
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up a session based PSK (see L<SSL_CTX_set_psk_use_session_callback(3)>).
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=head1 RETURN VALUES
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SSL_SESSION_get_protocol_version() returns a number indicating the protocol
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version used for the session; this number matches the constants I<e.g.>
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B<TLS1_VERSION>, B<TLS1_2_VERSION> or B<TLS1_3_VERSION>.
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Note that the SSL_SESSION_get_protocol_version() function
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does B<not> perform a null check on the provided session B<s> pointer.
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SSL_SESSION_set_protocol_version() returns 1 on success or 0 on failure.
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=head1 SEE ALSO
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L<ssl(7)>,
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L<SSL_CTX_set_psk_use_session_callback(3)>
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=head1 HISTORY
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The SSL_SESSION_get_protocol_version() function was added in OpenSSL 1.1.0.
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The SSL_SESSION_set_protocol_version() function was added in OpenSSL 1.1.1.
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=head1 COPYRIGHT
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Copyright 2001-2018 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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