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.\"
.IX Title "SSL_SET_INCOMING_STREAM_POLICY 3ossl"
.TH SSL_SET_INCOMING_STREAM_POLICY 3ossl "2024-06-04" "3.3.1" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH "NAME"
SSL_set_incoming_stream_policy, SSL_INCOMING_STREAM_POLICY_AUTO,
SSL_INCOMING_STREAM_POLICY_ACCEPT,
SSL_INCOMING_STREAM_POLICY_REJECT \- manage the QUIC incoming stream
policy
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/ssl.h>
\&
\& #define SSL_INCOMING_STREAM_POLICY_AUTO
\& #define SSL_INCOMING_STREAM_POLICY_ACCEPT
\& #define SSL_INCOMING_STREAM_POLICY_REJECT
\&
\& int SSL_set_incoming_stream_policy(SSL *conn, int policy,
\&                                           uint64_t app_error_code);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fISSL_set_incoming_stream_policy()\fR policy changes the incoming stream policy for a
\&\s-1QUIC\s0 connection. Depending on the policy configured, OpenSSL \s-1QUIC\s0 may
automatically reject incoming streams initiated by the peer. This is intended to
ensure that legacy applications using single-stream operation with a default
stream on a \s-1QUIC\s0 connection \s-1SSL\s0 object are not passed remotely-initiated streams
by a peer which those applications are not prepared to handle.
.PP
\&\fIapp_error_code\fR is an application error code which will be used in any \s-1QUIC
\&\s0\fB\s-1STOP_SENDING\s0\fR or \fB\s-1RESET_STREAM\s0\fR frames generated to implement the policy. The
default application error code is 0.
.PP
The valid values for \fIpolicy\fR are:
.IP "\s-1SSL_INCOMING_STREAM_POLICY_AUTO\s0" 4
.IX Item "SSL_INCOMING_STREAM_POLICY_AUTO"
This is the default setting. Incoming streams are accepted according to the
following rules:
.RS 4
.IP "\(bu" 4
If the default stream mode (configured using \fISSL_set_default_stream_mode\fR\|(3))
is set to \fB\s-1SSL_DEFAULT_STREAM_MODE_AUTO_BIDI\s0\fR (the default) or
\&\fB\s-1SSL_DEFAULT_STREAM_MODE_AUTO_UNI\s0\fR, the incoming stream is rejected.
.IP "\(bu" 4
Otherwise (where the default stream mode is \fB\s-1SSL_DEFAULT_STREAM_MODE_NONE\s0\fR),
the application is assumed to be stream aware, and the incoming stream is
accepted.
.RE
.RS 4
.RE
.IP "\s-1SSL_INCOMING_STREAM_POLICY_ACCEPT\s0" 4
.IX Item "SSL_INCOMING_STREAM_POLICY_ACCEPT"
Always accept incoming streams, allowing them to be dequeued using
\&\fISSL_accept_stream\fR\|(3).
.IP "\s-1SSL_INCOMING_STREAM_POLICY_REJECT\s0" 4
.IX Item "SSL_INCOMING_STREAM_POLICY_REJECT"
Always reject incoming streams.
.PP
Where an incoming stream is rejected, it is rejected immediately and it is not
possible to gain access to the stream using \fISSL_accept_stream\fR\|(3). The stream
is rejected using \s-1QUIC \s0\fB\s-1STOP_SENDING\s0\fR and \fB\s-1RESET_STREAM\s0\fR frames as
appropriate.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
Returns 1 on success and 0 on failure.
.PP
This function fails if called on a \s-1QUIC\s0 stream \s-1SSL\s0 object, or on a non-QUIC \s-1SSL\s0
object.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fISSL_set_default_stream_mode\fR\|(3), \fISSL_accept_stream\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
\&\fISSL_set_incoming_stream_policy()\fR was added in OpenSSL 3.2.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2002\-2023 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.