149 lines
7.3 KiB
Text
149 lines
7.3 KiB
Text
=pod
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=head1 NAME
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BIO_get_new_index,
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BIO_meth_new, BIO_meth_free, BIO_meth_get_read_ex, BIO_meth_set_read_ex,
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BIO_meth_get_write_ex, BIO_meth_set_write_ex, BIO_meth_get_write,
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BIO_meth_set_write, BIO_meth_get_read, BIO_meth_set_read, BIO_meth_get_puts,
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BIO_meth_set_puts, BIO_meth_get_gets, BIO_meth_set_gets, BIO_meth_get_ctrl,
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BIO_meth_set_ctrl, BIO_meth_get_create, BIO_meth_set_create,
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BIO_meth_get_destroy, BIO_meth_set_destroy, BIO_meth_get_callback_ctrl,
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BIO_meth_set_callback_ctrl - Routines to build up BIO methods
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=head1 SYNOPSIS
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#include <openssl/bio.h>
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int BIO_get_new_index(void);
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BIO_METHOD *BIO_meth_new(int type, const char *name);
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void BIO_meth_free(BIO_METHOD *biom);
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int (*BIO_meth_get_write_ex(BIO_METHOD *biom)) (BIO *, const char *, size_t,
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size_t *);
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int (*BIO_meth_get_write(BIO_METHOD *biom)) (BIO *, const char *, int);
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int BIO_meth_set_write_ex(BIO_METHOD *biom,
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int (*bwrite) (BIO *, const char *, size_t,
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size_t *));
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int BIO_meth_set_write(BIO_METHOD *biom,
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int (*write) (BIO *, const char *, int));
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int (*BIO_meth_get_read_ex(BIO_METHOD *biom)) (BIO *, char *, size_t,
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size_t *);
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int (*BIO_meth_get_read(BIO_METHOD *biom)) (BIO *, char *, int);
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int BIO_meth_set_read_ex(BIO_METHOD *biom,
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int (*bread) (BIO *, char *, size_t, size_t *));
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int BIO_meth_set_read(BIO_METHOD *biom,
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int (*read) (BIO *, char *, int));
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int (*BIO_meth_get_puts(BIO_METHOD *biom)) (BIO *, const char *);
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int BIO_meth_set_puts(BIO_METHOD *biom,
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int (*puts) (BIO *, const char *));
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int (*BIO_meth_get_gets(BIO_METHOD *biom)) (BIO *, char *, int);
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int BIO_meth_set_gets(BIO_METHOD *biom,
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int (*gets) (BIO *, char *, int));
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long (*BIO_meth_get_ctrl(BIO_METHOD *biom)) (BIO *, int, long, void *);
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int BIO_meth_set_ctrl(BIO_METHOD *biom,
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long (*ctrl) (BIO *, int, long, void *));
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int (*BIO_meth_get_create(BIO_METHOD *bion)) (BIO *);
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int BIO_meth_set_create(BIO_METHOD *biom, int (*create) (BIO *));
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int (*BIO_meth_get_destroy(BIO_METHOD *biom)) (BIO *);
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int BIO_meth_set_destroy(BIO_METHOD *biom, int (*destroy) (BIO *));
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long (*BIO_meth_get_callback_ctrl(BIO_METHOD *biom))
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(BIO *, int, bio_info_cb *);
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int BIO_meth_set_callback_ctrl(BIO_METHOD *biom,
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long (*callback_ctrl) (BIO *, int,
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bio_info_cb *));
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=head1 DESCRIPTION
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The B<BIO_METHOD> type is a structure used for the implementation of new BIO
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types. It provides a set of of functions used by OpenSSL for the implementation
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of the various BIO capabilities. See the L<bio> page for more information.
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BIO_meth_new() creates a new B<BIO_METHOD> structure. It should be given a
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unique integer B<type> and a string that represents its B<name>.
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Use BIO_get_new_index() to get the value for B<type>.
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The set of
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standard OpenSSL provided BIO types is provided in B<bio.h>. Some examples
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include B<BIO_TYPE_BUFFER> and B<BIO_TYPE_CIPHER>. Filter BIOs should have a
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type which have the "filter" bit set (B<BIO_TYPE_FILTER>). Source/sink BIOs
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should have the "source/sink" bit set (B<BIO_TYPE_SOURCE_SINK>). File descriptor
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based BIOs (e.g. socket, fd, connect, accept etc) should additionally have the
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"descriptor" bit set (B<BIO_TYPE_DESCRIPTOR>). See the L<BIO_find_type> page for
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more information.
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BIO_meth_free() destroys a B<BIO_METHOD> structure and frees up any memory
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associated with it.
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BIO_meth_get_write_ex() and BIO_meth_set_write_ex() get and set the function
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used for writing arbitrary length data to the BIO respectively. This function
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will be called in response to the application calling BIO_write_ex() or
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BIO_write(). The parameters for the function have the same meaning as for
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BIO_write_ex(). Older code may call BIO_meth_get_write() and
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BIO_meth_set_write() instead. Applications should not call both
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BIO_meth_set_write_ex() and BIO_meth_set_write() or call BIO_meth_get_write()
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when the function was set with BIO_meth_set_write_ex().
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BIO_meth_get_read_ex() and BIO_meth_set_read_ex() get and set the function used
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for reading arbitrary length data from the BIO respectively. This function will
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be called in response to the application calling BIO_read_ex() or BIO_read().
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The parameters for the function have the same meaning as for BIO_read_ex().
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Older code may call BIO_meth_get_read() and BIO_meth_set_read() instead.
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Applications should not call both BIO_meth_set_read_ex() and BIO_meth_set_read()
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or call BIO_meth_get_read() when the function was set with
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BIO_meth_set_read_ex().
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BIO_meth_get_puts() and BIO_meth_set_puts() get and set the function used for
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writing a NULL terminated string to the BIO respectively. This function will be
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called in response to the application calling BIO_puts(). The parameters for
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the function have the same meaning as for BIO_puts().
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BIO_meth_get_gets() and BIO_meth_set_gets() get and set the function typically
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used for reading a line of data from the BIO respectively (see the L<BIO_gets(3)>
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page for more information). This function will be called in response to the
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application calling BIO_gets(). The parameters for the function have the same
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meaning as for BIO_gets().
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BIO_meth_get_ctrl() and BIO_meth_set_ctrl() get and set the function used for
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processing ctrl messages in the BIO respectively. See the L<BIO_ctrl> page for
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more information. This function will be called in response to the application
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calling BIO_ctrl(). The parameters for the function have the same meaning as for
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BIO_ctrl().
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BIO_meth_get_create() and BIO_meth_set_create() get and set the function used
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for creating a new instance of the BIO respectively. This function will be
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called in response to the application calling BIO_new() and passing
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in a pointer to the current BIO_METHOD. The BIO_new() function will allocate the
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memory for the new BIO, and a pointer to this newly allocated structure will
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be passed as a parameter to the function.
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BIO_meth_get_destroy() and BIO_meth_set_destroy() get and set the function used
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for destroying an instance of a BIO respectively. This function will be
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called in response to the application calling BIO_free(). A pointer to the BIO
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to be destroyed is passed as a parameter. The destroy function should be used
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for BIO specific clean up. The memory for the BIO itself should not be freed by
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this function.
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BIO_meth_get_callback_ctrl() and BIO_meth_set_callback_ctrl() get and set the
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function used for processing callback ctrl messages in the BIO respectively. See
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the L<BIO_callback_ctrl(3)> page for more information. This function will be called
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in response to the application calling BIO_callback_ctrl(). The parameters for
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the function have the same meaning as for BIO_callback_ctrl().
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=head1 SEE ALSO
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L<bio>, L<BIO_find_type>, L<BIO_ctrl>, L<BIO_read_ex>, L<BIO_new>
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=head1 HISTORY
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The functions described here were added in OpenSSL version 1.1.0.
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=head1 COPYRIGHT
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Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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