mirror of https://github.com/openssl/openssl
163 lines
6.3 KiB
Plaintext
163 lines
6.3 KiB
Plaintext
=pod
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=head1 NAME
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SSL_get_stream_read_state, SSL_get_stream_write_state,
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SSL_get_stream_read_error_code, SSL_get_stream_write_error_code,
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SSL_STREAM_STATE_NONE, SSL_STREAM_STATE_OK, SSL_STREAM_STATE_WRONG_DIR,
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SSL_STREAM_STATE_FINISHED, SSL_STREAM_STATE_RESET_LOCAL,
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SSL_STREAM_STATE_RESET_REMOTE, SSL_STREAM_STATE_CONN_CLOSED - get QUIC stream
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state
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=head1 SYNOPSIS
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#include <openssl/ssl.h>
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#define SSL_STREAM_STATE_NONE
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#define SSL_STREAM_STATE_OK
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#define SSL_STREAM_STATE_WRONG_DIR
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#define SSL_STREAM_STATE_FINISHED
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#define SSL_STREAM_STATE_RESET_LOCAL
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#define SSL_STREAM_STATE_RESET_REMOTE
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#define SSL_STREAM_STATE_CONN_CLOSED
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int SSL_get_stream_read_state(SSL *ssl);
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int SSL_get_stream_write_state(SSL *ssl);
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int SSL_get_stream_read_error_code(SSL *ssl, uint64_t *app_error_code);
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int SSL_get_stream_write_error_code(SSL *ssl, uint64_t *app_error_code);
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=head1 DESCRIPTION
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SSL_get_stream_read_state() and SSL_get_stream_write_state() retrieve the
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overall state of the receiving and sending parts of a QUIC stream, respectively.
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They both return one of the following values:
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=over 4
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=item B<SSL_STREAM_STATE_NONE>
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This value is returned if called on a non-QUIC SSL object, or on a QUIC
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connection SSL object without a default stream attached.
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=item B<SSL_STREAM_STATE_OK>
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This value is returned on a stream which has not been concluded and remains
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healthy.
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=item B<SSL_STREAM_STATE_WRONG_DIR>
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This value is returned if SSL_get_stream_read_state() is called on a
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locally-initiated (and thus send-only) unidirectional stream, or, conversely, if
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SSL_get_stream_write_state() is called on a remotely-initiated (and thus
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receive-only) unidirectional stream.
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=item B<SSL_STREAM_STATE_FINISHED>
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For SSL_get_stream_read_state(), this value is returned when the remote peer has
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signalled the end of the receiving part of the stream. Note that there may still
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be residual data available to read via L<SSL_read(3)> when this state is
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returned.
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For SSL_get_stream_write_state(), this value is returned when the local
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application has concluded the stream using L<SSL_stream_conclude(3)>. Future
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L<SSL_write(3)> calls will not succeed.
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=item B<SSL_STREAM_STATE_RESET_LOCAL>
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This value is returned when the applicable stream part was reset by the local
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application.
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For SSL_get_stream_read_state(), this means that the receiving part of the
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stream was aborted using a locally transmitted QUIC B<STOP_SENDING> frame. It
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may or may not still be possible to obtain any residual data which remains to be
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read by calling L<SSL_read(3)>.
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For SSL_get_stream_write_state(), this means that the sending part of the stream
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was aborted, for example because the application called L<SSL_stream_reset(3)>,
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or because a QUIC stream SSL object with an un-concluded sending part was freed
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using L<SSL_free(3)>. Calls to L<SSL_write(3)> will fail.
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When this value is returned, the application error code which was signalled can
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be obtained by calling SSL_get_stream_read_error_code() or
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SSL_get_stream_write_error_code() as appropriate.
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=item B<SSL_STREAM_STATE_RESET_REMOTE>
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This value is returned when the applicable stream part was reset by the remote
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peer.
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For SSL_get_stream_read_state(), this means that the peer sent a QUIC
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B<RESET_STREAM> frame for the receiving part of the stream; the receiving part
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of the stream was logically aborted by the peer.
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For SSL_get_stream_write_state(), this means that the peer sent a QUIC
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B<STOP_SENDING> frame for the sending part of the stream; the peer has indicated
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that it does not wish to receive further data on the sending part of the stream.
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Calls to L<SSL_write(3)> will fail.
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When this value is returned, the application error code which was signalled can
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be obtained by calling SSL_get_stream_read_error_code() or
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SSL_get_stream_write_error_code() as appropriate.
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=item B<SSL_STREAM_STATE_CONN_CLOSED>
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The QUIC connection to which the stream belongs was closed. You can obtain
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information about the circumstances of this closure using
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L<SSL_get_conn_close_info(3)>. There may still be residual data available to
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read via L<SSL_read(3)> when this state is returned. Calls to L<SSL_write(3)>
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will fail. SSL_get_stream_read_state() will return this state if and only if
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SSL_get_stream_write_state() will also return this state.
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=back
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SSL_get_stream_read_error_code() and SSL_get_stream_write_error_code() provide
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the application error code which was signalled during non-normal termination of
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the receiving or sending parts of a stream, respectively. On success, the
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application error code is written to I<*app_error_code>.
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=head1 NOTES
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If a QUIC connection is closed, the stream state for all streams transitions to
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B<SSL_STREAM_STATE_CONN_CLOSED>, but no application error code can be retrieved
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using SSL_get_stream_read_error_code() or SSL_get_stream_write_error_code(), as
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the QUIC connection closure process does not cause an application error code to
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be associated with each individual stream still existing at the time of
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connection closure. However, you can obtain the overall error code associated
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with the connection closure using L<SSL_get_conn_close_info(3)>.
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=head1 RETURN VALUES
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SSL_get_stream_read_state() and SSL_get_stream_write_state() return one of the
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B<SSL_STREAM_STATE> values. If called on a non-QUIC SSL object, or a QUIC
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connection SSL object without a default stream, B<SSL_STREAM_STATE_NONE> is
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returned.
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SSL_get_stream_read_error_code() and SSL_get_stream_write_error_code() return 1
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on success and 0 if the stream was terminated normally. They return -1 on error,
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for example if the stream is still healthy, was still healthy at the time of
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connection closure, if called on a stream for which the respective stream part
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does not exist (e.g. on a unidirectional stream), or if called on a non-QUIC
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object or a QUIC connection SSL object without a default stream attached.
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=head1 SEE ALSO
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L<SSL_stream_conclude(3)>, L<SSL_stream_reset(3)>, L<SSL_new_stream(3)>,
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L<SSL_accept_stream(3)>, L<SSL_get_conn_close_info(3)>
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=head1 HISTORY
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These functions were added in OpenSSL 3.2.
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=head1 COPYRIGHT
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Copyright 2002-2023 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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