Sortix 1.1dev nightly manual
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| BIO_FIND_TYPE(3) | Library Functions Manual | BIO_FIND_TYPE(3) |
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);
#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
DESCRIPTION
The functionBIO_find_type() searches for a
BIO of a given type in a chain, starting at BIO
b. If
bio_type is a specific type (such as
BIO_TYPE_MEM), then a search is made for a
BIO of that type. If bio_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.
Note: not all the BIO_TYPE_* types above have
corresponding BIO implementations.
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);
SEE ALSO
BIO_new(3)HISTORY
BIO_method_type() first appeared in SSLeay
0.6.0. BIO_find_type() first appeared in
SSLeay 0.6.6. Both functions have been available since
OpenBSD 2.4.
BIO_next() first appeared in OpenSSL 0.9.6
and has been available since OpenBSD 2.9.
BUGS
BIO_find_type() in OpenSSL 0.9.5a and earlier
could not be safely passed a NULL pointer
for the b argument.| March 27, 2018 | Debian |