OpenSSL

Cryptography and SSL/TLS Toolkit

SSL_get_version

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 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.

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 that no version has been set (no connection established).

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.

SEE ALSO

ssl(7)

HISTORY

SSL_is_dtls() was added in OpenSSL 1.1.0.

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