BIO_find_type, BIO_next, BIO_method_type - BIO chain traversal
#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);
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.
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.
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 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.