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-.\"     $OpenBSD: SSL_CTX_set_info_callback.3,v 1.4 2018/03/27 17:35:50 schwarze Exp $
-.\"     OpenSSL b97fdb57 Nov 11 09:33:09 2016 +0100
-.\"
-.\" This file was written by Lutz Jaenicke <jaenicke@openssl.org>.
-.\" Copyright (c) 2001, 2005, 2014 The OpenSSL Project.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\"
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\"
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in
-.\"    the documentation and/or other materials provided with the
-.\"    distribution.
-.\"
-.\" 3. All advertising materials mentioning features or use of this
-.\"    software must display the following acknowledgment:
-.\"    "This product includes software developed by the OpenSSL Project
-.\"    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
-.\"
-.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
-.\"    endorse or promote products derived from this software without
-.\"    prior written permission. For written permission, please contact
-.\"    openssl-core@openssl.org.
-.\"
-.\" 5. Products derived from this software may not be called "OpenSSL"
-.\"    nor may "OpenSSL" appear in their names without prior written
-.\"    permission of the OpenSSL Project.
-.\"
-.\" 6. Redistributions of any form whatsoever must retain the following
-.\"    acknowledgment:
-.\"    "This product includes software developed by the OpenSSL Project
-.\"    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
-.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
-.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
-.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
-.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
-.\" OF THE POSSIBILITY OF SUCH DAMAGE.
-.\"
-.Dd $Mdocdate: March 27 2018 $
-.Dt SSL_CTX_SET_INFO_CALLBACK 3
-.Os
-.Sh NAME
-.Nm SSL_CTX_set_info_callback ,
-.Nm SSL_CTX_get_info_callback ,
-.Nm SSL_set_info_callback ,
-.Nm SSL_get_info_callback
-.Nd handle information callback for SSL connections
-.Sh SYNOPSIS
-.In openssl/ssl.h
-.Ft void
-.Fo SSL_CTX_set_info_callback
-.Fa "SSL_CTX *ctx"
-.Fa "void (*callback)(const SSL *ssl, int where, int ret)"
-.Fc
-.Ft void
-.Fo "(*SSL_CTX_get_info_callback(const SSL_CTX *ctx))"
-.Fa "const SSL *ssl"
-.Fa "int where"
-.Fa "int ret"
-.Fc
-.Ft void
-.Fo SSL_set_info_callback
-.Fa "SSL *ssl"
-.Fa "void (*callback)(const SSL *ssl, int where, int ret)"
-.Fc
-.Ft void
-.Fo "(*SSL_get_info_callback(const SSL *ssl))"
-.Fa "const SSL *ssl"
-.Fa "int where"
-.Fa "int ret"
-.Fc
-.Sh DESCRIPTION
-.Fn SSL_CTX_set_info_callback
-sets the
-.Fa callback
-function that can be used to obtain state information for SSL objects created
-from
-.Fa ctx
-during connection setup and use.
-The setting for
-.Fa ctx
-is overridden from the setting for a specific SSL object, if specified.
-When
-.Fa callback
-is
-.Dv NULL ,
-no callback function is used.
-.Pp
-.Fn SSL_set_info_callback
-sets the
-.Fa callback
-function that can be used to
-obtain state information for
-.Fa ssl
-during connection setup and use.
-When
-.Fa callback
-is
-.Dv NULL ,
-the callback setting currently valid for
-.Fa ctx
-is used.
-.Pp
-.Fn SSL_CTX_get_info_callback
-returns a pointer to the currently set information callback function for
-.Fa ctx .
-.Pp
-.Fn SSL_get_info_callback
-returns a pointer to the currently set information callback function for
-.Fa ssl .
-.Pp
-When setting up a connection and during use,
-it is possible to obtain state information from the SSL/TLS engine.
-When set, an information callback function is called whenever the state changes,
-an alert appears, or an error occurs.
-.Pp
-The callback function is called as
-.Fn callback "SSL *ssl" "int where" "int ret" .
-The
-.Fa where
-argument specifies information about where (in which context)
-the callback function was called.
-If
-.Fa ret
-is 0, an error condition occurred.
-If an alert is handled,
-.Dv SSL_CB_ALERT
-is set and
-.Fa ret
-specifies the alert information.
-.Pp
-.Fa where
-is a bitmask made up of the following bits:
-.Bl -tag -width Ds
-.It Dv SSL_CB_LOOP
-Callback has been called to indicate state change inside a loop.
-.It Dv SSL_CB_EXIT
-Callback has been called to indicate error exit of a handshake function.
-(May be soft error with retry option for non-blocking setups.)
-.It Dv SSL_CB_READ
-Callback has been called during read operation.
-.It Dv SSL_CB_WRITE
-Callback has been called during write operation.
-.It Dv SSL_CB_ALERT
-Callback has been called due to an alert being sent or received.
-.It Dv SSL_CB_READ_ALERT
-.It Dv SSL_CB_WRITE_ALERT
-.It Dv SSL_CB_ACCEPT_LOOP
-.It Dv SSL_CB_ACCEPT_EXIT
-.It Dv SSL_CB_CONNECT_LOOP
-.It Dv SSL_CB_CONNECT_EXIT
-.It Dv SSL_CB_HANDSHAKE_START
-Callback has been called because a new handshake is started.
-.It Dv SSL_CB_HANDSHAKE_DONE
-Callback has been called because a handshake is finished.
-.El
-.Pp
-The current state information can be obtained using the
-.Xr SSL_state_string 3
-family of functions.
-.Pp
-The
-.Fa ret
-information can be evaluated using the
-.Xr SSL_alert_type_string 3
-family of functions.
-.Sh RETURN VALUES
-.Fn SSL_CTX_get_info_callback
-and
-.Fn SSL_get_info_callback
-return a pointer to the current callback or
-.Dv NULL
-if none is set.
-.Sh EXAMPLES
-The following example callback function prints state strings,
-information about alerts being handled and error messages to the
-.Va bio_err
-.Vt BIO .
-.Bd -literal
-void
-apps_ssl_info_callback(SSL *s, int where, int ret)
-{
-        const char *str;
-        int w;
-
-        w = where & ~SSL_ST_MASK;
-
-        if (w & SSL_ST_CONNECT)
-                str = "SSL_connect";
-        else if (w & SSL_ST_ACCEPT)
-                str = "SSL_accept";
-        else
-                str = "undefined";
-
-        if (where & SSL_CB_LOOP) {
-                BIO_printf(bio_err, "%s:%s\en", str,
-                    SSL_state_string_long(s));
-        } else if (where & SSL_CB_ALERT) {
-                str = (where & SSL_CB_READ) ? "read" : "write";
-                BIO_printf(bio_err, "SSL3 alert %s:%s:%s\en", str,
-                        SSL_alert_type_string_long(ret),
-                        SSL_alert_desc_string_long(ret));
-        } else if (where & SSL_CB_EXIT) {
-                if (ret == 0)
-                        BIO_printf(bio_err, "%s:failed in %s\en",
-                                str, SSL_state_string_long(s));
-                else if (ret < 0) {
-                        BIO_printf(bio_err, "%s:error in %s\en",
-                                str, SSL_state_string_long(s));
-                }
-        }
-}
-.Ed
-.Sh SEE ALSO
-.Xr ssl 3 ,
-.Xr SSL_alert_type_string 3 ,
-.Xr SSL_state_string 3
-.Sh HISTORY
-These functions first appeared in SSLeay 0.6.0
-and have been available since
-.Ox 2.4 .