SSL_clear(3)

SSL_clear(3)                 OpenSSL                 SSL_clear(3)

NAME

     SSL_clear - reset SSL object to allow another connection

SYNOPSIS

      #include <openssl/ssl.h>

      int SSL_clear(SSL *ssl);

DESCRIPTION

     Reset ssl to allow another connection. All settings (method,
     ciphers, BIOs) are kept.

NOTES

     SSL_clear is used to prepare an SSL object for a new
     connection. While all settings are kept, a side effect is
     the handling of the current SSL session.  If a session is
     still open, it is considered bad and will be removed from
     the session cache, as required by RFC2246. A session is
     considered open, if SSL_shutdown(3) was not called for the
     connection or at least SSL_set_shutdown(3) was used to set
     the SSL_SENT_SHUTDOWN state.

     If a session was closed cleanly, the session object will be
     kept and all settings corresponding. This explicitly means,
     that e.g. the special method used during the session will be
     kept for the next handshake. So if the session was a TLSv1
     session, a SSL client object will use a TLSv1 client method
     for the next handshake and a SSL server object will use a
     TLSv1 server method, even if SSLv23_*_methods were chosen on
     startup. This will might lead to connection failures (see
     SSL_new(3)) for a description of the method's properties.

WARNINGS

     SSL_clear() resets the SSL object to allow for another
     connection. The reset operation however keeps several
     settings of the last sessions (some of these settings were
     made automatically during the last handshake). It only makes
     sense for a new connection with the exact same peer that
     shares these settings, and may fail if that peer changes its
     settings between connections. Use the sequence
     SSL_get_session(3); SSL_new(3); SSL_set_session(3);
     SSL_free(3) instead to avoid such failures (or simply
     SSL_free(3); SSL_new(3) if session reuse is not desired).

RETURN VALUES

     The following return values can occur:

     0   The SSL_clear() operation could not be performed. Check
         the error stack to find out the reason.

     1   The SSL_clear() operation was successful.

1.0.2t               Last change: 2019-09-10                    1

SSL_clear(3)                 OpenSSL                 SSL_clear(3)

     SSL_new(3), SSL_free(3), SSL_shutdown(3),
     SSL_set_shutdown(3), SSL_CTX_set_options(3), ssl(3),
     SSL_CTX_set_client_cert_cb(3)

1.0.2t               Last change: 2019-09-10                    2