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SSL_SESSION_GET_PROTOCOL_VERSION(3) Library Functions Manual SSL_SESSION_GET_PROTOCOL_VERSION(3)

SSL_SESSION_get_protocol_version
get the session protocol version

#include <openssl/ssl.h>
int
SSL_SESSION_get_protocol_version(const SSL_SESSION *s);

SSL_SESSION_get_protocol_version() returns the protocol version number used by the session s.

SSL_SESSION_get_protocol_version() returns a constant like TLS1_VERSION or TLS1_2_VERSION.

ssl(3), SSL_get_session(3), SSL_SESSION_get0_peer(3), SSL_SESSION_get_compress_id(3), SSL_SESSION_get_id(3), SSL_SESSION_get_time(3), SSL_SESSION_new(3)

SSL_SESSION_get_protocol_version() first appeared in OpenSSL 1.1.0 and has been available since OpenBSD 6.3.
March 24, 2018 OpenBSD-current