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Title "BIO_find_type 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
BIO_find_type, BIO_next - BIO chain traversal Header "SYNOPSIS" .Vb 1 #include <openssl/bio.h> \& BIO * BIO_find_type(BIO *b,int bio_type); BIO * BIO_next(BIO *b); \& #define BIO_method_type(b) ((b)->method->type) \& #define BIO_TYPE_NONE 0 #define BIO_TYPE_MEM (1|0x0400) #define BIO_TYPE_FILE (2|0x0400) \& #define BIO_TYPE_FD (4|0x0400|0x0100) #define BIO_TYPE_SOCKET (5|0x0400|0x0100) #define BIO_TYPE_NULL (6|0x0400) #define BIO_TYPE_SSL (7|0x0200) #define BIO_TYPE_MD (8|0x0200) #define BIO_TYPE_BUFFER (9|0x0200) #define BIO_TYPE_CIPHER (10|0x0200) #define BIO_TYPE_BASE64 (11|0x0200) #define BIO_TYPE_CONNECT (12|0x0400|0x0100) #define BIO_TYPE_ACCEPT (13|0x0400|0x0100) #define BIO_TYPE_PROXY_CLIENT (14|0x0200) #define BIO_TYPE_PROXY_SERVER (15|0x0200) #define BIO_TYPE_NBIO_TEST (16|0x0200) #define BIO_TYPE_NULL_FILTER (17|0x0200) #define BIO_TYPE_BER (18|0x0200) #define BIO_TYPE_BIO (19|0x0400) \& #define BIO_TYPE_DESCRIPTOR 0x0100 #define BIO_TYPE_FILTER 0x0200 #define BIO_TYPE_SOURCE_SINK 0x0400 .Ve Header "DESCRIPTION" The BIO_find_type() searches for a \s-1BIO\s0 of a given type in a chain, starting at \s-1BIO \s0b. If type is a specific type (such as \s-1BIO_TYPE_MEM\s0) then a search is made for a \s-1BIO\s0 of that type. If type is a general type (such as \fB\s-1BIO_TYPE_SOURCE_SINK\s0) then the next matching \s-1BIO\s0 of the given general type is searched for. BIO_find_type() returns the next matching \s-1BIO\s0 or \s-1NULL\s0 if none is found.

Note: not all the BIO_TYPE_* types above have corresponding \s-1BIO\s0 implementations.

\fIBIO_next() returns the next \s-1BIO\s0 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.

\fIBIO_method_type() returns the type of a \s-1BIO.\s0

Header "RETURN VALUES" \fIBIO_find_type() returns a matching \s-1BIO\s0 or \s-1NULL\s0 for no match.

\fIBIO_next() returns the next \s-1BIO\s0 in a chain.

\fIBIO_method_type() returns the type of the \s-1BIO \s0b.

Header "NOTES" \fIBIO_next() was added to OpenSSL 0.9.6 to provide a 'clean' way to traverse a \s-1BIO\s0 chain or find multiple matches using BIO_find_type(). Previous versions had to use:

.Vb 1 next = bio->next_bio; .Ve

Header "BUGS" \fIBIO_find_type() in OpenSSL 0.9.5a and earlier could not be safely passed a \s-1NULL\s0 pointer for the b argument. Header "EXAMPLE" Traverse a chain looking for digest BIOs:

.Vb 2 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); .Ve

Header "SEE ALSO" \s-1TBA\s0