201 lines
6.8 KiB
Groff
Executable File
201 lines
6.8 KiB
Groff
Executable File
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.\" ========================================================================
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.\"
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.IX Title "SSL_NEW 3"
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.TH SSL_NEW 3 "2020-03-02" "3.0.0-dev" "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_dup, SSL_new, SSL_up_ref \- create an SSL structure for a 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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\& SSL *SSL_dup(SSL *s);
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\& SSL *SSL_new(SSL_CTX *ctx);
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\& int SSL_up_ref(SSL *s);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fISSL_new()\fR creates a new \fB\s-1SSL\s0\fR structure which is needed to hold the
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data for a \s-1TLS/SSL\s0 connection. The new structure inherits the settings
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of the underlying context \fBctx\fR: connection method,
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options, verification settings, timeout settings. An \fB\s-1SSL\s0\fR structure is
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reference counted. Creating an \fB\s-1SSL\s0\fR structure for the first time increments
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the reference count. Freeing it (using SSL_free) decrements it. When the
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reference count drops to zero, any memory or resources allocated to the \fB\s-1SSL\s0\fR
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structure are freed.
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.PP
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\&\fISSL_up_ref()\fR increments the reference count for an
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existing \fB\s-1SSL\s0\fR structure.
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.PP
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\&\fISSL_dup()\fR duplicates an existing \fB\s-1SSL\s0\fR structure into a new allocated one
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or just increments the reference count if the connection is active. All
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settings are inherited from the original \fB\s-1SSL\s0\fR structure. Dynamic data (i.e.
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existing connection details) are not copied, the new \fB\s-1SSL\s0\fR is set into an
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initial accept (server) or connect (client) state.
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.PP
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\&\fISSL_dup()\fR allows applications to configure an \s-1SSL\s0 handle for use in multiple
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\&\s-1SSL\s0 connections, and then duplicate it prior to initiating each connection
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with the duplicated handle. Use of \fISSL_dup()\fR avoids the need to repeat
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the configuration of the handles for each connection.
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.PP
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For \fISSL_dup()\fR to work, the connection \s-1MUST\s0 be in its initial state and
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\&\s-1MUST\s0 \s-1NOT\s0 have not yet have started the \s-1SSL\s0 handshake. For connections
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that are not in their initial state \fISSL_dup()\fR just increments an internal
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reference count and returns the \fIsame\fR handle. It may be possible to
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use \fISSL_clear\fR\|(3) to recycle an \s-1SSL\s0 handle that is not in its initial
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state for re-use, but this is best avoided. Instead, save and restore
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the session, if desired, and construct a fresh handle for each connection.
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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 "\s-1NULL\s0" 4
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.IX Item "NULL"
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The creation of a new \s-1SSL\s0 structure failed. Check the error stack to
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find out the reason.
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.IP "Pointer to an \s-1SSL\s0 structure" 4
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.IX Item "Pointer to an SSL structure"
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The return value points to an allocated \s-1SSL\s0 structure.
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.Sp
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\&\fISSL_up_ref()\fR returns 1 for success and 0 for failure.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fISSL_free\fR\|(3), \fISSL_clear\fR\|(3),
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\&\fISSL_CTX_set_options\fR\|(3),
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\&\fISSL_get_SSL_CTX\fR\|(3),
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\&\fIssl\fR\|(7)
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2000\-2017 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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