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98 lines
2.6 KiB
98 lines
2.6 KiB
=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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