BIO_FIND_TYPE - Online Linux Manual Page

Section : 3
Updated : 2021-03-26
Source : 1.1.1k
Note : OpenSSL
NAMEBIO_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);
DESCRIPTIONThe 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.
EXAMPLESTraverse 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);
COPYRIGHTCopyright 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>. 0
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