SSL_set_incoming_stream_policy, SSL_INCOMING_STREAM_POLICY_AUTO, SSL_INCOMING_STREAM_POLICY_ACCEPT,

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       Licensed under the Apache License 2.0 (the "License").  You may not use this file  except  in  compliance
       with  the  License.   You  can  obtain  a  copy  in  the  file  LICENSE  in the source distribution or at
       <https://www.openssl.org/source/license.html>.

3.5.0                                              2025-06-04               SSL_SET_INCOMING_STREAM_POLICY(3SSL)

SSL_set_incoming_stream_policy() policy changes the incoming stream policy for a QUIC connection.
       Depending on the policy configured, OpenSSL QUIC 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 QUIC connection SSL object are not passed remotely-initiated streams by a peer which
       those applications are not prepared to handle.

       app_error_code is an application error code which will be used in any QUIC STOP_SENDING or RESET_STREAM
       frames generated to implement the policy. The default application error code is 0.

       The valid values for policy are:

       SSL_INCOMING_STREAM_POLICY_AUTO
           This is the default setting. Incoming streams are accepted according to the following rules:

           •   If   the  default  stream  mode  (configured  using  SSL_set_default_stream_mode(3))  is  set  to
               SSL_DEFAULT_STREAM_MODE_AUTO_BIDI (the default) or SSL_DEFAULT_STREAM_MODE_AUTO_UNI, the incoming
               stream is rejected.

           •   Otherwise (where the default stream mode is  SSL_DEFAULT_STREAM_MODE_NONE),  the  application  is
               assumed to be stream aware, and the incoming stream is accepted.

       SSL_INCOMING_STREAM_POLICY_ACCEPT
           Always accept incoming streams, allowing them to be dequeued using SSL_accept_stream(3).

       SSL_INCOMING_STREAM_POLICY_REJECT
           Always reject incoming streams.

       Where an incoming stream is rejected, it is rejected immediately and it is not possible to gain access to
       the  stream  using  SSL_accept_stream(3). The stream is rejected using QUIC STOP_SENDING and RESET_STREAM
       frames as appropriate.

SSL_set_incoming_stream_policy() was added in OpenSSL 3.2.

       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

       Returns 1 on success and 0 on failure.

       This function fails if called on a QUIC stream SSL object, or on a non-QUIC SSL object.

SSL_set_default_stream_mode(3), SSL_accept_stream(3)

        #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);