204 lines
6.3 KiB
Groff
204 lines
6.3 KiB
Groff
.\" $NetBSD: SSL_shutdown.3,v 1.1 2001/04/12 10:45:44 itojun Exp $
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.\" ======================================================================
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.\"
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.IX Title "SSL_shutdown 3"
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.TH SSL_shutdown 3 "0.9.6a" "2001-04-12" "OpenSSL"
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.UC
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.SH "NAME"
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SSL_shutdown \- shut down a \s-1TLS/SSL\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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\& int SSL_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_shutdown()\fR shuts down an active \s-1TLS/SSL\s0 connection. It sends the
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\&\*(L"close notify\*(R" shutdown alert to the peer.
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.SH "NOTES"
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.IX Header "NOTES"
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\&\fISSL_shutdown()\fR tries to send the \*(L"close notify\*(R" shutdown alert to the peer.
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Whether the operation succeeds or not, the \s-1SSL_SENT_SHUTDOWN\s0 flag is set and
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a currently open session is considered closed and good and will be kept in the
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session cache for further reuse.
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.PP
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The behaviour of \fISSL_shutdown()\fR depends on the underlying \s-1BIO\s0.
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.PP
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If the underlying \s-1BIO\s0 is \fBblocking\fR, \fISSL_shutdown()\fR will only return once the
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handshake has been finished or an error occurred.
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.PP
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If the underlying \s-1BIO\s0 is \fBnon-blocking\fR, \fISSL_shutdown()\fR will also return
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when the underlying \s-1BIO\s0 could not satisfy the needs of \fISSL_shutdown()\fR
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to continue the handshake. In this case a call to \fISSL_get_error()\fR with the
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return value of \fISSL_shutdown()\fR will yield \fB\s-1SSL_ERROR_WANT_READ\s0\fR or
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\&\fB\s-1SSL_ERROR_WANT_WRITE\s0\fR. The calling process then must repeat the call after
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taking appropriate action to satisfy the needs of \fISSL_shutdown()\fR.
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The action depends on the underlying \s-1BIO\s0. When using a non-blocking socket,
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nothing is to be done, but \fIselect()\fR can be used to check for the required
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condition. When using a buffering \s-1BIO\s0, like a \s-1BIO\s0 pair, data must be written
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into or retrieved out of the \s-1BIO\s0 before being able to continue.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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The following return values can occur:
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.Ip "1" 4
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.IX Item "1"
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The shutdown was successfully completed.
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.Ip "0" 4
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The shutdown was not successful. Call \fISSL_get_error()\fR with the return
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value \fBret\fR to find out the reason.
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.Ip "\-1" 4
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.IX Item "-1"
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The shutdown was not successful because a fatal error occurred either
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at the protocol level or a connection failure occurred. It can also occur of
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action is need to continue the operation for non-blocking BIOs.
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Call \fISSL_get_error()\fR with the return value \fBret\fR to find out the reason.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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SSL_get_error(3), SSL_connect(3),
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SSL_accept(3), SSL_set_shutdown(3),
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SSL_clear(3), SSL_free(3),
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ssl(3), openssl_bio(3)
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