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=head1 NAME

SSL_SESSION_get_protocol_version,
SSL_SESSION_set_protocol_version
- get and set the session protocol version

=head1 SYNOPSIS

 #include <openssl/ssl.h>

 int SSL_SESSION_get_protocol_version(const SSL_SESSION *s);
 int SSL_SESSION_set_protocol_version(SSL_SESSION *s, int version);

=head1 DESCRIPTION

SSL_SESSION_get_protocol_version() returns the protocol version number used
by session B<s>.

SSL_SESSION_set_protocol_version() sets the protocol version associated with the
SSL_SESSION object B<s> to the value B<version>. This value should be a version
constant such as B<TLS1_3_VERSION> etc. For example, this could be used to set
up a session based PSK (see L<SSL_CTX_set_psk_use_session_callback(3)>).

=head1 RETURN VALUES

SSL_SESSION_get_protocol_version() returns a number indicating the protocol
version used for the session; this number matches the constants I<e.g.>
B<TLS1_VERSION>, B<TLS1_2_VERSION> or B<TLS1_3_VERSION>.

Note that the SSL_SESSION_get_protocol_version() function
does B<not> perform a null check on the provided session B<s> pointer.

SSL_SESSION_set_protocol_version() returns 1 on success or 0 on failure.

=head1 SEE ALSO

L<ssl(7)>,
L<SSL_CTX_set_psk_use_session_callback(3)>

=head1 HISTORY

The SSL_SESSION_get_protocol_version() function was added in OpenSSL 1.1.0.
The SSL_SESSION_set_protocol_version() function was added in OpenSSL 1.1.1.

=head1 COPYRIGHT

Copyright 2001-2018 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the OpenSSL license (the "License").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file LICENSE in the source distribution or at
L<https://www.openssl.org/source/license.html>.

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