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73 lines
2.0 KiB
Plaintext
73 lines
2.0 KiB
Plaintext
=pod
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=head1 NAME
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SSL_set_shutdown, SSL_get_shutdown - manipulate shutdown state of an SSL connection
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=head1 SYNOPSIS
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#include <openssl/ssl.h>
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void SSL_set_shutdown(SSL *ssl, int mode);
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int SSL_get_shutdown(const SSL *ssl);
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=head1 DESCRIPTION
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SSL_set_shutdown() sets the shutdown state of B<ssl> to B<mode>.
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SSL_get_shutdown() returns the shutdown mode of B<ssl>.
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=head1 NOTES
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The shutdown state of an ssl connection is a bitmask of:
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=over 4
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=item Z<>0
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No shutdown setting, yet.
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=item SSL_SENT_SHUTDOWN
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A "close notify" shutdown alert was sent to the peer, the connection is being
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considered closed and the session is closed and correct.
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=item SSL_RECEIVED_SHUTDOWN
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A shutdown alert was received form the peer, either a normal "close notify"
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or a fatal error.
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=back
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SSL_SENT_SHUTDOWN and SSL_RECEIVED_SHUTDOWN can be set at the same time.
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The shutdown state of the connection is used to determine the state of
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the ssl session. If the session is still open, when
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L<SSL_clear(3)|SSL_clear(3)> or L<SSL_free(3)|SSL_free(3)> is called,
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it is considered bad and removed according to RFC2246.
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The actual condition for a correctly closed session is SSL_SENT_SHUTDOWN
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(according to the TLS RFC, it is acceptable to only send the "close notify"
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alert but to not wait for the peer's answer, when the underlying connection
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is closed).
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SSL_set_shutdown() can be used to set this state without sending a
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close alert to the peer (see L<SSL_shutdown(3)|SSL_shutdown(3)>).
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If a "close notify" was received, SSL_RECEIVED_SHUTDOWN will be set,
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for setting SSL_SENT_SHUTDOWN the application must however still call
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L<SSL_shutdown(3)|SSL_shutdown(3)> or SSL_set_shutdown() itself.
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=head1 RETURN VALUES
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SSL_set_shutdown() does not return diagnostic information.
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SSL_get_shutdown() returns the current setting.
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=head1 SEE ALSO
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L<ssl(3)|ssl(3)>, L<SSL_shutdown(3)|SSL_shutdown(3)>,
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L<SSL_CTX_set_quiet_shutdown(3)|SSL_CTX_set_quiet_shutdown(3)>,
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L<SSL_clear(3)|SSL_clear(3)>, L<SSL_free(3)|SSL_free(3)>
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=cut
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