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Diffstat (limited to 'doc/crypto/BIO_find_type.pod')
-rw-r--r-- | doc/crypto/BIO_find_type.pod | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/doc/crypto/BIO_find_type.pod b/doc/crypto/BIO_find_type.pod new file mode 100644 index 0000000000..1a1d6bfad5 --- /dev/null +++ b/doc/crypto/BIO_find_type.pod @@ -0,0 +1,93 @@ +=pod + +=head1 NAME + + BIO_find_type, BIO_next - BIO chain traversal + +=head1 SYNOPSIS + + #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 + +=head1 DESCRIPTION + +The BIO_find_type() searches for a BIO of a given type in a chain, starting +at BIO B<b>. If B<type> is a specific type (such as BIO_TYPE_MEM) then a search +is made for a BIO of that type. If B<type> is a general type (such as +B<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 B<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. + +=head1 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<b>. + +=head1 NOTES + +BIO_next() was added to OpenSSL 0.9.6 to provide a 'clean' way to traverse a BIO +chain or find multiple matches using BIO_find_type(). Previous versions had to +use: + + next = bio->next_bio; + +=head1 EXAMPLE + +Traverse a chain looking for digest BIOs: + + BIO *btmp; + btmp = in_bio; /* in_bio is chain to search through */ + + for(;;) { + 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); + } + + +=head1 SEE ALSO + +TBA |