SSL_SET_SHUTDOWN(3) BSD Library Functions Manual SSL_SET_SHUTDOWN(3)NAME
SSL_set_shutdown, SSL_get_shutdown — manipulate shutdown state of an SSL
connection
SYNOPSIS
#include <openssl/ssl.h>
void
SSL_set_shutdown(SSL *ssl, int mode);
int
SSL_get_shutdown(const SSL *ssl);
DESCRIPTIONSSL_set_shutdown() sets the shutdown state of ssl to mode.
SSL_get_shutdown() returns the shutdown mode of ssl.
NOTES
The shutdown state of an ssl connection is a bitmask of:
0 No shutdown setting, yet.
SSL_SENT_SHUTDOWN
A “close notify” shutdown alert was sent to the peer; the connec‐
tion is being considered closed and the session is closed and
correct.
SSL_RECEIVED_SHUTDOWN
A shutdown alert was received form the peer, either a normal
“close notify” or a fatal error.
SSL_SENT_SHUTDOWN and SSL_RECEIVED_SHUTDOWN can be set at the same time.
The shutdown state of the connection is used to determine the state of
the ssl session. If the session is still open when SSL_clear(3) or
SSL_free(3) is called, it is considered bad and removed according to
RFC2246. The actual condition for a correctly closed session is
SSL_SENT_SHUTDOWN (according to the TLS RFC, it is acceptable to only
send the “close notify” alert but to not wait for the peer's answer when
the underlying connection is closed). SSL_set_shutdown() can be used to
set this state without sending a close alert to the peer (see
SSL_shutdown(3)).
If a “close notify” was received, SSL_RECEIVED_SHUTDOWN will be set, but
to set SSL_SENT_SHUTDOWN the application must still call SSL_shutdown(3)
or SSL_set_shutdown() itself.
RETURN VALUESSSL_set_shutdown() does not return diagnostic information.
SSL_get_shutdown() returns the current setting.
SEE ALSOssl(3), SSL_clear(3), SSL_CTX_set_quiet_shutdown(3), SSL_free(3),
SSL_shutdown(3)BSD April 25, 2024 BSD
