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SSL_GET_VERSION(3) Library Functions Manual SSL_GET_VERSION(3)

SSL_get_version, SSL_versionget the protocol version of a connection

#include <openssl/ssl.h>

const char *
SSL_get_version(const SSL *ssl);

SSL_version(const SSL *ssl);

() returns the name of the protocol used for the connection ssl.

() returns an integer constant representing that protocol.

These functions only return reliable results after the initial handshake has been completed.

The following strings or integers can be returned:

The connection uses the TLSv1.0 protocol.
"TLSv1.1" or TLS1_1_VERSION
The connection uses the TLSv1.1 protocol.
"TLSv1.2" or TLS1_2_VERSION
The connection uses the TLSv1.2 protocol.
"TLSv1.3" or TLS1_3_VERSION
The connection uses the TLSv1.3 protocol.
The connection uses the Datagram Transport Layer Security 1.0 protocol.
This indicates an unknown protocol version; it cannot currently happen with LibreSSL.


SSL_get_version() and SSL_version() first appeared in SSLeay 0.8.0 and have been available since OpenBSD 2.4.

March 18, 2019 OpenBSD-6.7