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Package containing this man page: core/openssl (version 1.1.0.f-2)



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 2000-2016 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 <>.
2017-05-25 1.1.0f