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.\" $OpenBSD: BIO_find_type.3,v 1.9 2018/03/27 17:35:50 schwarze Exp $
.\" OpenSSL 99d63d46 Oct 26 13:56:48 2016 -0400
.\"
.\" This file was written by Dr. Stephen Henson <steve@openssl.org>.
.\" Copyright (c) 2000, 2013, 2016 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
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.\"
.Dd $Mdocdate: March 27 2018 $
.Dt BIO_FIND_TYPE 3
.Os
.Sh NAME
.Nm BIO_find_type ,
.Nm BIO_next ,
.Nm BIO_method_type
.Nd BIO chain traversal
.Sh SYNOPSIS
.In openssl/bio.h
.Ft BIO *
.Fo BIO_find_type
.Fa "BIO *b"
.Fa "int bio_type"
.Fc
.Ft BIO *
.Fo BIO_next
.Fa "BIO *b"
.Fc
.Ft int
.Fo BIO_method_type
.Fa "const BIO *b"
.Fc
.Fd #define BIO_TYPE_NONE 0
.Fd #define BIO_TYPE_MEM (1|0x0400)
.Fd #define BIO_TYPE_FILE (2|0x0400)
.Fd #define BIO_TYPE_FD (4|0x0400|0x0100)
.Fd #define BIO_TYPE_SOCKET (5|0x0400|0x0100)
.Fd #define BIO_TYPE_NULL (6|0x0400)
.Fd #define BIO_TYPE_SSL (7|0x0200)
.Fd #define BIO_TYPE_MD (8|0x0200)
.Fd #define BIO_TYPE_BUFFER (9|0x0200)
.Fd #define BIO_TYPE_CIPHER (10|0x0200)
.Fd #define BIO_TYPE_BASE64 (11|0x0200)
.Fd #define BIO_TYPE_CONNECT (12|0x0400|0x0100)
.Fd #define BIO_TYPE_ACCEPT (13|0x0400|0x0100)
.Fd #define BIO_TYPE_PROXY_CLIENT (14|0x0200)
.Fd #define BIO_TYPE_PROXY_SERVER (15|0x0200)
.Fd #define BIO_TYPE_NBIO_TEST (16|0x0200)
.Fd #define BIO_TYPE_NULL_FILTER (17|0x0200)
.Fd #define BIO_TYPE_BER (18|0x0200)
.Fd #define BIO_TYPE_BIO (19|0x0400)
.Fd #define BIO_TYPE_DESCRIPTOR 0x0100
.Fd #define BIO_TYPE_FILTER 0x0200
.Fd #define BIO_TYPE_SOURCE_SINK 0x0400
.Sh DESCRIPTION
The function
.Fn BIO_find_type
searches for a BIO of a given type in a chain, starting at BIO
.Fa b .
If
.Fa bio_type
is a specific type (such as
.Dv BIO_TYPE_MEM ) ,
then a search is made for a BIO of that type.
If
.Fa bio_type
is a general type (such as
.Dv BIO_TYPE_SOURCE_SINK ) ,
then the next matching BIO of the given general type is searched for.
.Fn BIO_find_type
returns the next matching BIO or
.Dv NULL
if none is found.
.Pp
Note: not all the
.Dv BIO_TYPE_*
types above have corresponding BIO implementations.
.Pp
.Fn BIO_next
returns the next BIO in a chain.
It can be used to traverse all BIOs in a chain or used in conjunction with
.Fn BIO_find_type
to find all BIOs of a certain type.
.Pp
.Fn BIO_method_type
returns the type of a BIO.
.Sh RETURN VALUES
.Fn BIO_find_type
returns a matching BIO or
.Dv NULL
for no match.
.Pp
.Fn BIO_next
returns the next BIO in a chain.
.Pp
.Fn BIO_method_type
returns the type of the BIO
.Fa b .
.Sh EXAMPLES
Traverse a chain looking for digest BIOs:
.Bd -literal -offset 2n
BIO *btmp;
btmp = in_bio; /* in_bio is chain to search through */
do {
btmp = BIO_find_type(btmp, BIO_TYPE_MD);
if (btmp == NULL)
break; /* Not found */
/* btmp is a digest BIO, do something with it ...*/
...
btmp = BIO_next(btmp);
} while(btmp);
.Ed
.Sh SEE ALSO
.Xr BIO_new 3
.Sh HISTORY
.Fn BIO_method_type
first appeared in SSLeay 0.6.0.
.Fn BIO_find_type
first appeared in SSLeay 0.6.6.
Both functions have been available since
.Ox 2.4 .
.Pp
.Fn BIO_next
first appeared in OpenSSL 0.9.6 and has been available since
.Ox 2.9 .
.Sh BUGS
.Fn BIO_find_type
in OpenSSL 0.9.5a and earlier could not be safely passed a
.Dv NULL
pointer for the
.Fa b
argument.
|
