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47238a3d3f
Reviewed-by: Matt Caswell <matt@openssl.org> Reviewed-by: Tomas Mraz <tomas@openssl.org> (Merged from https://github.com/openssl/openssl/pull/20765)
87 lines
3.0 KiB
Plaintext
87 lines
3.0 KiB
Plaintext
=pod
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=head1 NAME
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SSL_free - free an allocated SSL structure
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=head1 SYNOPSIS
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#include <openssl/ssl.h>
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void SSL_free(SSL *ssl);
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=head1 DESCRIPTION
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SSL_free() decrements the reference count of B<ssl>, and removes the SSL
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structure pointed to by B<ssl> and frees up the allocated memory if the
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reference count has reached 0.
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If B<ssl> is NULL nothing is done.
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=head1 NOTES
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SSL_free() also calls the free()ing procedures for indirectly affected items, if
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applicable: the buffering BIO, the read and write BIOs,
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cipher lists specially created for this B<ssl>, the B<SSL_SESSION>.
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Do not explicitly free these indirectly freed up items before or after
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calling SSL_free(), as trying to free things twice may lead to program
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failure.
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The ssl session has reference counts from two users: the SSL object, for
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which the reference count is removed by SSL_free() and the internal
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session cache. If the session is considered bad, because
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L<SSL_shutdown(3)> was not called for the connection
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and L<SSL_set_shutdown(3)> was not used to set the
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SSL_SENT_SHUTDOWN state, the session will also be removed
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from the session cache as required by RFC2246.
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When used to free a QUIC stream SSL object, the respective sending and receiving
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parts of the stream are reset unless those parts have already been concluded
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normally:
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=over 4
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=item
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If the stream has a sending part (in other words, if it is bidirectional or a
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locally-initiated unidirectional stream) and that part has not been concluded
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via a call to L<SSL_stream_conclude(3)> or L<SSL_stream_reset(3)> on the QUIC
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stream SSL object, a call to SSL_free() automatically resets the sending part of
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the stream as though L<SSL_stream_reset(3)> were called with a QUIC application
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error code of 0.
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=item
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If the stream has a receiving part (in other words, if it is bidirectional or a
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remotely-initiated unidirectional stream), and the peer has not yet concluded
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that part of the stream normally (such as via a call to
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L<SSL_stream_conclude(3)> on its own end), a call to SSL_free() automatically
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requests the reset of the receiving part of the stream using a QUIC STOP_SENDING
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frame with a QUIC application error code of 0. Note that as per the QUIC
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protocol, this will automatically cause the peer to reset that part of the
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stream in turn (which is its sending part).
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=back
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A QUIC stream SSL object maintains a reference to a QUIC connection SSL object
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internally, therefore a QUIC stream SSL object and its parent QUIC connection
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SSL object can be freed in either order.
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=head1 RETURN VALUES
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SSL_free() does not provide diagnostic information.
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L<SSL_new(3)>, L<SSL_clear(3)>,
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L<SSL_shutdown(3)>, L<SSL_set_shutdown(3)>,
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L<ssl(7)>
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=head1 COPYRIGHT
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Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). 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 LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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