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BIO_find_type(3)
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BIO_find_type, BIO_next - BIO chain traversal
#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
The BIO_find_type() function 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 sought. The BIO_find_type()function
returns the next matching BIO or NULL if none is found.
Note
Some BIO_TYPE_* types do not have corresponding BIO implementations.
The BIO_next()function returns the next BIO in a chain. It
can be used to traverse all BIOs in a chain or used in
conjunction with the BIO_find_type() function to find all
BIOs of a certain type.
The BIO_method_type() function returns the type of a BIO.
The BIO_next() function was added to OpenSSL 0.9.6 to provide
a clean way to traverse a BIO chain or find multiple
matches using the BIO_find_type() function. Previous versions
used the following:
next = bio->next_bio;
The BIO_find_type() function in OpenSSL 0.9.5a and earlier
could not be safely passed a NULL pointer for the b argument.
The BIO_find_type() function returns a matching BIO or
NULL for no match.
The BIO_next() function returns the next BIO in a chain.
The BIO_method_type() function 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);
TBA
BIO_find_type(3)
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