BIO_FIND_TYPE

NAME

BIO_find_type, BIO_next, BIO_method_type − BIO chain traversal

SYNOPSIS

#include <openssl/bio.h>
BIO *BIO_find_type(BIO *b, int bio_type);
BIO *BIO_next(BIO *b);
int BIO_method_type(const BIO *b);

DESCRIPTION

The BIO_find_type() searches for a BIO of a given type in a chain, starting at BIO b. If type is a specific type (such as BIO_TYPE_MEM ) then a search is made for a BIO of that type. If type is a general type (such as BIO_TYPE_SOURCE_SINK ) then the next matching BIO of the given general type is searched for. BIO_find_type() returns the next matching BIO or NULL if none is found.

The following general types are defined: BIO_TYPE_DESCRIPTOR , BIO_TYPE_FILTER , and BIO_TYPE_SOURCE_SINK .

For a list of the specific types, see the openssl/bio.h header file.

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 BIO_find_type() to find all BIOs of a certain type.

BIO_method_type() returns the type of a BIO.

RETURN VALUES

BIO_find_type() returns a matching BIO or NULL for no match.

BIO_next() returns the next BIO in a chain.

BIO_method_type() returns the type of the BIO b.

EXAMPLES

Traverse a chain looking for digest BIOs:

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);

COPYRIGHT

Copyright 2000−2019 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the OpenSSL license (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>.