SSL_DUP(3)                 Library Functions Manual                 SSL_DUP(3)

NAME
     SSL_dup - deep copy of an SSL object

SYNOPSIS
     library "libssl" libcrypto
     #include <openssl/ssl.h>

     SSL *
     SSL_dup(SSL *ssl);

DESCRIPTION
     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.

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

SEE ALSO
     ssl(3), SSL_clear(3), SSL_copy_session_id(3), SSL_free(3), SSL_new(3),
     SSL_set_security_level(3)

HISTORY
     SSL_dup() first appeared in SSLeay 0.8.0 and has been available since
     OpenBSD 2.4.

Linux 6.18.6-arch1-1             June 8, 2025             Linux 6.18.6-arch1-1