=pod
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=head1 NAME
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BIO_find_type, BIO_next - BIO chain traversal
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=head1 SYNOPSIS
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#include <openssl/bio.h>
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BIO * BIO_find_type(BIO *b,int bio_type);
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BIO * BIO_next(BIO *b);
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#define BIO_method_type(b) ((b)->method->type)
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#define BIO_TYPE_NONE 0
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#define BIO_TYPE_MEM (1|0x0400)
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#define BIO_TYPE_FILE (2|0x0400)
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#define BIO_TYPE_FD (4|0x0400|0x0100)
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#define BIO_TYPE_SOCKET (5|0x0400|0x0100)
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#define BIO_TYPE_NULL (6|0x0400)
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#define BIO_TYPE_SSL (7|0x0200)
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#define BIO_TYPE_MD (8|0x0200)
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#define BIO_TYPE_BUFFER (9|0x0200)
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#define BIO_TYPE_CIPHER (10|0x0200)
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#define BIO_TYPE_BASE64 (11|0x0200)
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#define BIO_TYPE_CONNECT (12|0x0400|0x0100)
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#define BIO_TYPE_ACCEPT (13|0x0400|0x0100)
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#define BIO_TYPE_PROXY_CLIENT (14|0x0200)
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#define BIO_TYPE_PROXY_SERVER (15|0x0200)
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#define BIO_TYPE_NBIO_TEST (16|0x0200)
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#define BIO_TYPE_NULL_FILTER (17|0x0200)
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#define BIO_TYPE_BER (18|0x0200)
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#define BIO_TYPE_BIO (19|0x0400)
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#define BIO_TYPE_DESCRIPTOR 0x0100
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#define BIO_TYPE_FILTER 0x0200
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#define BIO_TYPE_SOURCE_SINK 0x0400
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=head1 DESCRIPTION
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The BIO_find_type() searches for a BIO of a given type in a chain, starting
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at BIO B<b>. If B<type> is a specific type (such as BIO_TYPE_MEM) then a search
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is made for a BIO of that type. If B<type> is a general type (such as
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B<BIO_TYPE_SOURCE_SINK>) then the next matching BIO of the given general type is
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searched for. BIO_find_type() returns the next matching BIO or NULL if none is
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found.
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Note: not all the B<BIO_TYPE_*> types above have corresponding BIO implementations.
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BIO_next() returns the next BIO in a chain. It can be used to traverse all BIOs
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in a chain or used in conjunction with BIO_find_type() to find all BIOs of a
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certain type.
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BIO_method_type() returns the type of a BIO.
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=head1 RETURN VALUES
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BIO_find_type() returns a matching BIO or NULL for no match.
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BIO_next() returns the next BIO in a chain.
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BIO_method_type() returns the type of the BIO B<b>.
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=head1 NOTES
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BIO_next() was added to OpenSSL 0.9.6 to provide a 'clean' way to traverse a BIO
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chain or find multiple matches using BIO_find_type(). Previous versions had to
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use:
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next = bio->next_bio;
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=head1 BUGS
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BIO_find_type() in OpenSSL 0.9.5a and earlier could not be safely passed a
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NULL pointer for the B<b> argument.
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=head1 EXAMPLE
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Traverse a chain looking for digest BIOs:
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BIO *btmp;
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btmp = in_bio; /* in_bio is chain to search through */
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do {
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btmp = BIO_find_type(btmp, BIO_TYPE_MD);
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if(btmp == NULL) break; /* Not found */
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/* btmp is a digest BIO, do something with it ...*/
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...
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btmp = BIO_next(btmp);
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} while(btmp);
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=head1 SEE ALSO
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TBA
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