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+.\" $OpenBSD: SSL_get_version.3,v 1.10 2025/06/08 22:49:42 schwarze Exp $
+.\" full merge up to: OpenSSL e417070c Jun 8 11:37:06 2016 -0400
+.\" selective merge up to: OpenSSL df75c2bf Dec 9 01:02:36 2018 +0100
+.\"
+.\" This file was written by Lutz Jaenicke <jaenicke@openssl.org>.
+.\" Copyright (c) 2001, 2005, 2014 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_VERSION 3
+.Os
+.Sh NAME
+.Nm SSL_get_version ,
+.Nm SSL_is_dtls ,
+.Nm SSL_version
+.Nd get the protocol information of a connection
+.Sh SYNOPSIS
+.Lb libssl libcrypto
+.In openssl/ssl.h
+.Ft const char *
+.Fn SSL_get_version "const SSL *ssl"
+.Ft int
+.Fn SSL_is_dtls "const SSL *ssl"
+.Ft int
+.Fn SSL_version "const SSL *ssl"
+.Sh DESCRIPTION
+.Fn SSL_get_version
+returns the name of the protocol used for the connection
+.Fa ssl .
+.Pp
+.Fn SSL_is_dtls
+returns 1 if the connection is using DTLS, 0 if not.
+.Pp
+.Fn SSL_version
+returns an integer constant representing that protocol.
+.Pp
+These functions only return reliable results
+after the initial handshake has been completed.
+.Sh RETURN VALUES
+The following strings or integers can be returned by
+.Fn SSL_get_version
+and
+.Fn SSL_version :
+.Bl -tag -width Ds
+.It Qo TLSv1 Qc No or Dv TLS1_VERSION
+The connection uses the TLSv1.0 protocol.
+.It Qo TLSv1.1 Qc No or Dv TLS1_1_VERSION
+The connection uses the TLSv1.1 protocol.
+.It Qo TLSv1.2 Qc No or Dv TLS1_2_VERSION
+The connection uses the TLSv1.2 protocol.
+.It Qo TLSv1.3 Qc No or Dv TLS1_3_VERSION
+The connection uses the TLSv1.3 protocol.
+.It Qo DTLSv1 Qc No or Dv DTLS1_VERSION
+The connection uses the Datagram Transport Layer Security 1.0 protocol.
+.It Qo DTLSv1.2 Qc No or Dv DTLS1_2_VERSION
+The connection uses the Datagram Transport Layer Security 1.2 protocol.
+.It Qq unknown
+This indicates an unknown protocol version;
+it cannot currently happen with LibreSSL.
+.El
+.Pp
+.Fn SSL_is_dtls
+returns 1 if the connection uses DTLS, 0 if not.
+.Sh SEE ALSO
+.Xr ssl 3
+.Sh HISTORY
+.Fn SSL_get_version
+and
+.Fn SSL_version
+first appeared in SSLeay 0.8.0 and have been available since
+.Ox 2.4 .
+.Pp
+.Fn SSL_is_dtls
+first appeared in OpenSSL 1.1.0 and has been available since
+.Ox 6.9 .