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BIO_FIND_TYPE(3ossl) OpenSSL BIO_FIND_TYPE(3ossl)
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);
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