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1.\" $OpenBSD: SSL_get_version.3,v 1.9 2021/04/15 16:13:22 tb Exp $
2.\" full merge up to: OpenSSL e417070c Jun 8 11:37:06 2016 -0400
3.\" selective merge up to: OpenSSL df75c2bf Dec 9 01:02:36 2018 +0100
4.\"
5.\" This file was written by Lutz Jaenicke <jaenicke@openssl.org>.
6.\" Copyright (c) 2001, 2005, 2014 The OpenSSL Project. All rights reserved.
7.\"
8.\" Redistribution and use in source and binary forms, with or without
9.\" modification, are permitted provided that the following conditions
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11.\"
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15.\" 2. Redistributions in binary form must reproduce the above copyright
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22.\" "This product includes software developed by the OpenSSL Project
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52.Dd $Mdocdate: April 15 2021 $
53.Dt SSL_GET_VERSION 3
54.Os
55.Sh NAME
56.Nm SSL_get_version ,
57.Nm SSL_is_dtls ,
58.Nm SSL_version
59.\" The following are intentionally undocumented because
60.\" - the longer term plan is to remove them
61.\" - nothing appears to be using them in the wild
62.\" - and they have the wrong namespace prefix
63.\" Nm TLS1_get_version
64.\" Nm TLS1_get_client_version
65.Nd get the protocol information of a connection
66.Sh SYNOPSIS
67.In openssl/ssl.h
68.Ft const char *
69.Fn SSL_get_version "const SSL *ssl"
70.Ft int
71.Fn SSL_is_dtls "const SSL *ssl"
72.Ft int
73.Fn SSL_version "const SSL *ssl"
74.Sh DESCRIPTION
75.Fn SSL_get_version
76returns the name of the protocol used for the connection
77.Fa ssl .
78.Pp
79.Fn SSL_is_dtls
80returns 1 if the connection is using DTLS, 0 if not.
81.Pp
82.Fn SSL_version
83returns an integer constant representing that protocol.
84.Pp
85These functions only return reliable results
86after the initial handshake has been completed.
87.Sh RETURN VALUES
88The following strings or integers can be returned by
89.Fn SSL_get_version
90and
91.Fn SSL_version :
92.Bl -tag -width Ds
93.It Qo TLSv1 Qc No or Dv TLS1_VERSION
94The connection uses the TLSv1.0 protocol.
95.It Qo TLSv1.1 Qc No or Dv TLS1_1_VERSION
96The connection uses the TLSv1.1 protocol.
97.It Qo TLSv1.2 Qc No or Dv TLS1_2_VERSION
98The connection uses the TLSv1.2 protocol.
99.It Qo TLSv1.3 Qc No or Dv TLS1_3_VERSION
100The connection uses the TLSv1.3 protocol.
101.It Qo DTLSv1 Qc No or Dv DTLS1_VERSION
102The connection uses the Datagram Transport Layer Security 1.0 protocol.
103.It Qo DTLSv1.2 Qc No or Dv DTLS1_2_VERSION
104The connection uses the Datagram Transport Layer Security 1.2 protocol.
105.It Qq unknown
106This indicates an unknown protocol version;
107it cannot currently happen with LibreSSL.
108.El
109.Pp
110.Fn SSL_is_dtls
111returns 1 if the connection uses DTLS, 0 if not.
112.Sh SEE ALSO
113.Xr ssl 3
114.Sh HISTORY
115.Fn SSL_get_version
116and
117.Fn SSL_version
118first appeared in SSLeay 0.8.0 and have been available since
119.Ox 2.4 .
120.Pp
121.Fn SSL_is_dtls
122first appeared in OpenSSL 1.1.0 and has been available since
123.Ox 6.9 .
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