192 lines
6.1 KiB
Groff
192 lines
6.1 KiB
Groff
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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 "2013-02-11" "1.0.1e" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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SSL_clear \- reset SSL object to allow another connection
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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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\&
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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 \fISSL_shutdown\fR\|(3) was not called for the connection
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or at least \fISSL_set_shutdown\fR\|(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 \fISSL_new\fR\|(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 for a new connection with the exact
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same peer that shares these settings, and may fail if that peer
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changes its settings between connections. Use the sequence
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\&\fISSL_get_session\fR\|(3);
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\&\fISSL_new\fR\|(3);
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\&\fISSL_set_session\fR\|(3);
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\&\fISSL_free\fR\|(3)
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instead to avoid such failures
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(or simply \fISSL_free\fR\|(3); \fISSL_new\fR\|(3)
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if session reuse is not desired).
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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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\&\fISSL_new\fR\|(3), \fISSL_free\fR\|(3),
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\&\fISSL_shutdown\fR\|(3), \fISSL_set_shutdown\fR\|(3),
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\&\fISSL_CTX_set_options\fR\|(3), \fIssl\fR\|(3),
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\&\fISSL_CTX_set_client_cert_cb\fR\|(3)
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