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SSL_GET_VERSION(3)		    OpenSSL		    SSL_GET_VERSION(3)

NAME
       SSL_client_version, SSL_get_version, SSL_is_dtls, SSL_version - get the
       protocol	information of a connection

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);

DESCRIPTION
       SSL_client_version() returns the	numeric	protocol version advertised by
       the client in the legacy_version	field of the ClientHello when
       initiating the connection. Note that, for TLS, this value will never
       indicate	a version greater than TLSv1.2 even if TLSv1.3 is subsequently
       negotiated. SSL_get_version() returns the name of the protocol used for
       the connection. SSL_version() returns the numeric protocol version used
       for the connection. They	should only be called after the	initial
       handshake has been completed. Prior to that the results returned	from
       these functions may be unreliable.

       SSL_is_dtls() returns one if the	connection is using DTLS, zero if not.

RETURN VALUES
       SSL_get_version() returns one of	the following strings:

       SSLv3
	   The connection uses the SSLv3 protocol.

       TLSv1
	   The connection uses the TLSv1.0 protocol.

       TLSv1.1
	   The connection uses the TLSv1.1 protocol.

       TLSv1.2
	   The connection uses the TLSv1.2 protocol.

       TLSv1.3
	   The connection uses the TLSv1.3 protocol.

       unknown
	   This	indicates an unknown protocol version.

       SSL_version() and SSL_client_version() return an	integer	which could
       include any of the following:

       SSL3_VERSION
	   The connection uses the SSLv3 protocol.

       TLS1_VERSION
	   The connection uses the TLSv1.0 protocol.

       TLS1_1_VERSION
	   The connection uses the TLSv1.1 protocol.

       TLS1_2_VERSION
	   The connection uses the TLSv1.2 protocol.

       TLS1_3_VERSION
	   The connection uses the TLSv1.3 protocol (never returned for
	   SSL_client_version()).

SEE ALSO
       ssl(7)

HISTORY
       The SSL_is_dtls() function was added in OpenSSL 1.1.0.

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
       <https://www.openssl.org/source/license.html>.

1.1.1d				  2019-09-10		    SSL_GET_VERSION(3)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | HISTORY | COPYRIGHT

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