202 lines
6.0 KiB
Groff
202 lines
6.0 KiB
Groff
.\" $NetBSD: SSL_clear.3,v 1.9 2004/03/20 21:48:46 groo Exp $
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.\" ======================================================================
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.\"
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.IX Title "SSL_clear 3"
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.TH SSL_clear 3 "0.9.7d" "2002-06-24" "OpenSSL"
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.UC
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.SH "NAME"
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SSL_clear \- reset \s-1SSL\s0 object to allow another 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_clear(SSL *ssl);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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Reset \fBssl\fR to allow another connection. All settings (method, ciphers,
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BIOs) are kept.
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.SH "NOTES"
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.IX Header "NOTES"
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SSL_clear is used to prepare an \s-1SSL\s0 object for a new connection. While all
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settings are kept, a side effect is the handling of the current \s-1SSL\s0 session.
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If a session is still \fBopen\fR, it is considered bad and will be removed
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from the session cache, as required by \s-1RFC2246\s0. A session is considered open,
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if SSL_shutdown(3) was not called for the connection
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or at least SSL_set_shutdown(3) was used to
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set the \s-1SSL_SENT_SHUTDOWN\s0 state.
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.PP
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If a session was closed cleanly, the session object will be kept and all
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settings corresponding. This explicitly means, that e.g. the special method
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used during the session will be kept for the next handshake. So if the
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session was a TLSv1 session, a \s-1SSL\s0 client object will use a TLSv1 client
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method for the next handshake and a \s-1SSL\s0 server object will use a TLSv1
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server method, even if SSLv23_*_methods were chosen on startup. This
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will might lead to connection failures (see SSL_new(3))
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for a description of the method's properties.
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.SH "WARNINGS"
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.IX Header "WARNINGS"
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\&\fISSL_clear()\fR resets the \s-1SSL\s0 object to allow for another connection. The
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reset operation however keeps several settings of the last sessions
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(some of these settings were made automatically during the last
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handshake). It only makes sense when opening a new session (or reusing
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an old one) with the same peer that shares these settings.
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\&\fISSL_clear()\fR is not a short form for the sequence
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SSL_free(3); SSL_new(3); .
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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 "0" 4
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The \fISSL_clear()\fR operation could not be performed. Check the error stack to
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find out the reason.
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.Ip "1" 4
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.IX Item "1"
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The \fISSL_clear()\fR operation was successful.
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.PP
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SSL_new(3), SSL_free(3),
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SSL_shutdown(3), SSL_set_shutdown(3),
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SSL_CTX_set_options(3), ssl(3),
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SSL_CTX_set_client_cert_cb(3)
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