SSL_CTX_SET_NEW_PENDING_CONN_CB(3ossl) OpenSSL
NAME
SSL_CTX_set_new_pending_conn_cb, SSL_set_new_pending_conn_cb_fn -
callback function to report creation of QUIC connection SSL objects
SYNOPSIS
typedef int (*SSL_set_new_pending_conn_cb_fn)(SSL_CTX *c, SSL *new_ssl,
void *arg);
void SSL_CTX_set_new_pending_conn_cb(SSL_CTX *c,
SSL_set_new_pending_conn_cb_fn *f,
void *arg);
DESCRIPTION
SSL_CTX_set_new_pending_conn_cb(3) sets the new_pending_conn callback
function and associated application data argument arg. When using the
QUIC transport, TLS handshake processing may occur independently from
the thread which accepts the connection that the handshake is
establishing. As such, SSL objects representing the connection may be
allocated and initialized prior to a call to SSL_accept_connection().
This registered callback may be used to decorate the preallocated SSL
object or create other associations with its parent SSL prior to a call
to SSL_accept_connection().
RETURN VALUES
SSL_CTX_set_new_pending_conn_cb(3) returns no value.
SSL_set_new_pending_conn_cb_fn() returns an integer value. A return
value of 0 indicates that the QUIC stack must discard this newly
created SSL object, implying that the associated new connection will
not be available for handling on a subsequent call to
SSL_accept_connection(). A nonzero return value is treated as success,
allowing the new connection to be enqueued to the accept queue.
SEE ALSO
SSL_set_ex_data(3)
NOTES
Callbacks in QUIC connections have some limitations to them that should
be taken into consideration when writing an application.
QUIC connections may begin processing prior to when an application
calls SSL_accept_connection() on them. As such, it may occur that
callbacks are delivered to applications' registered TLS callbacks
prior to those SSL objects being returned in
SSL_accept_connection(). Applications should expect this
possibility.
In particular no references should be held on SSL objects passed to
callbacks for QUIC connections until such time as they are returned
through a call to SSL_accept_connection.
HISTORY
SSL_CTX_set_new_pending_conn_cb(3) was added in OpenSSL 3.5
COPYRIGHT
Copyright 2025 The OpenSSL Project Authors. All Rights Reserved.
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 2025-04-10
SSL_CTX_SET_NEW_PENDING_CONN_CB(3ossl)
openssl 3.5.0 - Generated Tue Apr 29 15:41:03 CDT 2025