BIO_FIND_TYPE man page on DragonFly

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BIO_FIND_TYPE(3)	 BSD 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);

     #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

DESCRIPTION
     The function BIO_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 implemen‐
     tations.

     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.

NOTES
     BIO_next() was added to OpenSSL 0.9.6 to provide a 'clean' way to tra‐
     verse a BIO chain or find multiple matches using BIO_find_type().	Previ‐
     ous versions had to use:

	   next = bio->next_bio;

BUGS
     BIO_find_type() in OpenSSL 0.9.5a and earlier could not be safely passed
     a NULL pointer for the b argument.

EXAMPLE
     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);

BSD				 July 17, 2014				   BSD
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