mirror of
https://github.com/openssl/openssl.git
synced 2024-11-27 05:21:51 +08:00
4746f25ac6
[skip ci] Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/7829)
78 lines
2.8 KiB
Plaintext
78 lines
2.8 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
SSL_CTX_set_tlsext_servername_callback, SSL_CTX_set_tlsext_servername_arg,
|
|
SSL_get_servername_type, SSL_get_servername,
|
|
SSL_set_tlsext_host_name - handle server name indication (SNI)
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/ssl.h>
|
|
|
|
long SSL_CTX_set_tlsext_servername_callback(SSL_CTX *ctx,
|
|
int (*cb)(SSL *, int *, void *));
|
|
long SSL_CTX_set_tlsext_servername_arg(SSL_CTX *ctx, void *arg);
|
|
|
|
const char *SSL_get_servername(const SSL *s, const int type);
|
|
int SSL_get_servername_type(const SSL *s);
|
|
|
|
int SSL_set_tlsext_host_name(const SSL *s, const char *name);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
The functionality provided by the servername callback is superseded by the
|
|
ClientHello callback, which can be set using SSL_CTX_set_client_hello_cb().
|
|
The servername callback is retained for historical compatibility.
|
|
|
|
SSL_CTX_set_tlsext_servername_callback() sets the application callback B<cb>
|
|
used by a server to perform any actions or configuration required based on
|
|
the servername extension received in the incoming connection. When B<cb>
|
|
is NULL, SNI is not used. The B<arg> value is a pointer which is passed to
|
|
the application callback.
|
|
|
|
SSL_CTX_set_tlsext_servername_arg() sets a context-specific argument to be
|
|
passed into the callback for this B<SSL_CTX>.
|
|
|
|
SSL_get_servername() returns a servername extension value of the specified
|
|
type if provided in the Client Hello or NULL.
|
|
|
|
SSL_get_servername_type() returns the servername type or -1 if no servername
|
|
is present. Currently the only supported type (defined in RFC3546) is
|
|
B<TLSEXT_NAMETYPE_host_name>.
|
|
|
|
SSL_set_tlsext_host_name() sets the server name indication ClientHello extension
|
|
to contain the value B<name>. The type of server name indication extension is set
|
|
to B<TLSEXT_NAMETYPE_host_name> (defined in RFC3546).
|
|
|
|
=head1 NOTES
|
|
|
|
Several callbacks are executed during ClientHello processing, including
|
|
the ClientHello, ALPN, and servername callbacks. The ClientHello callback is
|
|
executed first, then the servername callback, followed by the ALPN callback.
|
|
|
|
The SSL_set_tlsext_host_name() function should only be called on SSL objects
|
|
that will act as clients; otherwise the configured B<name> will be ignored.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
SSL_CTX_set_tlsext_servername_callback() and
|
|
SSL_CTX_set_tlsext_servername_arg() both always return 1 indicating success.
|
|
SSL_set_tlsext_host_name() returns 1 on success, 0 in case of error.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<ssl(7)>, L<SSL_CTX_set_alpn_select_cb(3)>,
|
|
L<SSL_get0_alpn_selected(3)>, L<SSL_CTX_set_client_hello_cb(3)>
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2017 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
|
|
L<https://www.openssl.org/source/license.html>.
|
|
|
|
=cut
|