205 lines
6.0 KiB
Groff
205 lines
6.0 KiB
Groff
.\" $NetBSD: SSL_set_shutdown.3,v 1.6 2002/08/09 16:15:44 itojun Exp $
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.\" ======================================================================
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.\"
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.IX Title "SSL_set_shutdown 3"
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.TH SSL_set_shutdown 3 "0.9.6g" "2002-06-10" "OpenSSL"
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.UC
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.SH "NAME"
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SSL_set_shutdown, SSL_get_shutdown \- manipulate shutdown state of an \s-1SSL\s0 connection
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/ssl.h>
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.Ve
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.Vb 1
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\& void SSL_set_shutdown(SSL *ssl, int mode);
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.Ve
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.Vb 1
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\& int SSL_get_shutdown(SSL *ssl);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fISSL_set_shutdown()\fR sets the shutdown state of \fBssl\fR to \fBmode\fR.
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.PP
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\&\fISSL_get_shutdown()\fR returns the shutdown mode of \fBssl\fR.
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.SH "NOTES"
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.IX Header "NOTES"
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The shutdown state of an ssl connection is a bitmask of:
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.Ip "0" 4
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No shutdown setting, yet.
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.Ip "\s-1SSL_SENT_SHUTDOWN\s0" 4
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.IX Item "SSL_SENT_SHUTDOWN"
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A \*(L"close notify\*(R" 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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.Ip "\s-1SSL_RECEIVED_SHUTDOWN\s0" 4
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.IX Item "SSL_RECEIVED_SHUTDOWN"
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A shutdown alert was received form the peer, either a normal \*(L"close notify\*(R"
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or a fatal error.
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.PP
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\&\s-1SSL_SENT_SHUTDOWN\s0 and \s-1SSL_RECEIVED_SHUTDOWN\s0 can be set at the same time.
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.PP
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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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SSL_clear(3) or SSL_free(3) is called,
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it is considered bad and removed according to \s-1RFC2246\s0.
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The actual condition for a correctly closed session is \s-1SSL_SENT_SHUTDOWN\s0
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(according to the \s-1TLS\s0 \s-1RFC\s0, it is acceptable to only send the \*(L"close notify\*(R"
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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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\&\fISSL_set_shutdown()\fR can be used to set this state without sending a
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close alert to the peer (see SSL_shutdown(3)).
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.PP
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If a \*(L"close notify\*(R" was received, \s-1SSL_RECEIVED_SHUTDOWN\s0 will be set,
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for setting \s-1SSL_SENT_SHUTDOWN\s0 the application must however still call
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SSL_shutdown(3) or \fISSL_set_shutdown()\fR itself.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fISSL_set_shutdown()\fR does not return diagnostic information.
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.PP
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\&\fISSL_get_shutdown()\fR returns the current setting.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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ssl(3), SSL_shutdown(3),
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SSL_CTX_set_quiet_shutdown(3),
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SSL_clear(3), SSL_free(3)
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