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SSL_DUP(3) Library Functions Manual SSL_DUP(3)

deep copy of an SSL object

#include <openssl/ssl.h>
SSL_dup(SSL *ssl);

SSL_dup() constructs a new SSL object in the same context as ssl and copies much of the contained data from ssl to the new SSL object, but many fields, for example tlsext data, are not copied.
As an exception from deep copying, if a session is already established, the new object shares ssl->cert with the original object.

SSL_dup() returns the new SSL object or NULL on failure.

SSL_clear(3), SSL_copy_session_id(3), SSL_free(3), SSL_new(3)

SSL_dup() first appeared in SSLeay 0.8.0 and has been available since OpenBSD 2.4.
March 27, 2018 OpenBSD-current