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=pod
=head1 NAME
SSL_client_version, SSL_get_version, SSL_is_dtls, SSL_version - get the
protocol information of a connection
=head1 SYNOPSIS
#include <openssl/ssl.h>
int SSL_client_version(const SSL *s);
const char *SSL_get_version(const SSL *ssl);
int SSL_is_dtls(const SSL *ssl);
int SSL_version(const SSL *s);
=head1 DESCRIPTION
SSL_client_version() returns the protocol version used by the client when
initiating the connection.
SSL_get_version() returns the name of the protocol used for the
connection.
SSL_is_dtls() returns one if the connection is using DTLS, zero if not.
SSL_version() returns the protocol version used for the connection.
=head1 RETURN VALUES
SSL_get_version() returns one of the following strings:
=over 4
=item SSLv3
The connection uses the SSLv3 protocol.
=item TLSv1
The connection uses the TLSv1.0 protocol.
=item TLSv1.1
The connection uses the TLSv1.1 protocol.
=item TLSv1.2
The connection uses the TLSv1.2 protocol.
=item TLSv1.3
The connection uses the TLSv1.3 protocol.
=item unknown
This indicates that no version has been set (no connection established).
=back
SSL_version() and SSL_client_version() return an integer which could include any of
the following:
=over 4
=item SSL3_VERSION
The connection uses the SSLv3 protocol.
=item TLS1_VERSION
The connection uses the TLSv1.0 protocol.
=item TLS1_1_VERSION
The connection uses the TLSv1.1 protocol.
=item TLS1_2_VERSION
The connection uses the TLSv1.2 protocol.
=item TLS1_3_VERSION
The connection uses the TLSv1.3 protocol.
=back
=head1 SEE ALSO
L<ssl(7)>
=head1 HISTORY
SSL_is_dtls() was added in OpenSSL 1.1.0.
=head1 COPYRIGHT
Copyright 2001-2017 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>.
=cut
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