BIO_METH_NEW - Online Linux Manual PageSection : 3
Updated : 2021-03-26
Source : 1.1.1k
Note : OpenSSL
NAMEBIO_get_new_index, BIO_meth_new, BIO_meth_free, BIO_meth_get_read_ex, BIO_meth_set_read_ex, BIO_meth_get_write_ex, BIO_meth_set_write_ex, BIO_meth_get_write, BIO_meth_set_write, BIO_meth_get_read, BIO_meth_set_read, BIO_meth_get_puts, BIO_meth_set_puts, BIO_meth_get_gets, BIO_meth_set_gets, BIO_meth_get_ctrl, BIO_meth_set_ctrl, BIO_meth_get_create, BIO_meth_set_create, BIO_meth_get_destroy, BIO_meth_set_destroy, BIO_meth_get_callback_ctrl, BIO_meth_set_callback_ctrl − Routines to build up BIO methods
SYNOPSIS​ #include <openssl/bio.h> ​ ​ int BIO_get_new_index(void); ​ ​ BIO_METHOD *BIO_meth_new(int type, const char *name); ​ ​ void BIO_meth_free(BIO_METHOD *biom); ​ ​ int (*BIO_meth_get_write_ex(const BIO_METHOD *biom))(BIO *, const char *, size_t, ​ size_t *); ​ int (*BIO_meth_get_write(const BIO_METHOD *biom))(BIO *, const char *, int); ​ int BIO_meth_set_write_ex(BIO_METHOD *biom, ​ int (*bwrite)(BIO *, const char *, size_t, size_t *)); ​ int BIO_meth_set_write(BIO_METHOD *biom, ​ int (*write)(BIO *, const char *, int)); ​ ​ int (*BIO_meth_get_read_ex(const BIO_METHOD *biom))(BIO *, char *, size_t, size_t *); ​ int (*BIO_meth_get_read(const BIO_METHOD *biom))(BIO *, char *, int); ​ int BIO_meth_set_read_ex(BIO_METHOD *biom, ​ int (*bread)(BIO *, char *, size_t, size_t *)); ​ int BIO_meth_set_read(BIO_METHOD *biom, int (*read)(BIO *, char *, int)); ​ ​ int (*BIO_meth_get_puts(const BIO_METHOD *biom))(BIO *, const char *); ​ int BIO_meth_set_puts(BIO_METHOD *biom, int (*puts)(BIO *, const char *)); ​ ​ int (*BIO_meth_get_gets(const BIO_METHOD *biom))(BIO *, char *, int); ​ int BIO_meth_set_gets(BIO_METHOD *biom, ​ int (*gets)(BIO *, char *, int)); ​ ​ long (*BIO_meth_get_ctrl(const BIO_METHOD *biom))(BIO *, int, long, void *); ​ int BIO_meth_set_ctrl(BIO_METHOD *biom, ​ long (*ctrl)(BIO *, int, long, void *)); ​ ​ int (*BIO_meth_get_create(const BIO_METHOD *bion))(BIO *); ​ int BIO_meth_set_create(BIO_METHOD *biom, int (*create)(BIO *)); ​ ​ int (*BIO_meth_get_destroy(const BIO_METHOD *biom))(BIO *); ​ int BIO_meth_set_destroy(BIO_METHOD *biom, int (*destroy)(BIO *)); ​ ​ long (*BIO_meth_get_callback_ctrl(const BIO_METHOD *biom))(BIO *, int, BIO_info_cb *); ​ int BIO_meth_set_callback_ctrl(BIO_METHOD *biom, ​ long (*callback_ctrl)(BIO *, int, BIO_info_cb *));
DESCRIPTIONThe BIO_METHOD type is a structure used for the implementation of new BIO types. It provides a set of functions used by OpenSSL for the implementation of the various BIO capabilities. See the bio page for more information. ​BIO_meth_new() creates a new BIO_METHOD structure. It should be given a unique integer type and a string that represents its name. Use BIO_get_new_index() to get the value for type. The set of standard OpenSSL provided BIO types is provided in bio.h. Some examples include BIO_TYPE_BUFFER and BIO_TYPE_CIPHER. Filter BIOs should have a type which have the ‟filter” bit set (BIO_TYPE_FILTER). Source/sink BIOs should have the ‟source/sink” bit set (BIO_TYPE_SOURCE_SINK). File descriptor based BIOs (e.g. socket, fd, connect, accept etc) should additionally have the ​‟descriptor” bit set (BIO_TYPE_DESCRIPTOR). See the BIO_find_type page for more information. ​BIO_meth_free() destroys a BIO_METHOD structure and frees up any memory associated with it. ​BIO_meth_get_write_ex() and BIO_meth_set_write_ex() get and set the function used for writing arbitrary length data to the BIO respectively. This function will be called in response to the application calling BIO_write_ex() or ​BIO_write(). The parameters for the function have the same meaning as for ​BIO_write_ex(). Older code may call BIO_meth_get_write() and ​BIO_meth_set_write() instead. Applications should not call both ​BIO_meth_set_write_ex() and BIO_meth_set_write() or call BIO_meth_get_write() when the function was set with BIO_meth_set_write_ex(). ​BIO_meth_get_read_ex() and BIO_meth_set_read_ex() get and set the function used for reading arbitrary length data from the BIO respectively. This function will be called in response to the application calling BIO_read_ex() or BIO_read(). The parameters for the function have the same meaning as for BIO_read_ex(). Older code may call BIO_meth_get_read() and BIO_meth_set_read() instead. Applications should not call both BIO_meth_set_read_ex() and BIO_meth_set_read() or call BIO_meth_get_read() when the function was set with ​BIO_meth_set_read_ex(). ​BIO_meth_get_puts() and BIO_meth_set_puts() get and set the function used for writing a NULL terminated string to the BIO respectively. This function will be called in response to the application calling BIO_puts(). The parameters for the function have the same meaning as for BIO_puts(). ​BIO_meth_get_gets() and BIO_meth_set_gets() get and set the function typically used for reading a line of data from the BIO respectively (see the BIO_gets (3) page for more information). This function will be called in response to the application calling BIO_gets(). The parameters for the function have the same meaning as for BIO_gets(). ​BIO_meth_get_ctrl() and BIO_meth_set_ctrl() get and set the function used for processing ctrl messages in the BIO respectively. See the BIO_ctrl page for more information. This function will be called in response to the application calling BIO_ctrl(). The parameters for the function have the same meaning as for ​BIO_ctrl(). ​BIO_meth_get_create() and BIO_meth_set_create() get and set the function used for creating a new instance of the BIO respectively. This function will be called in response to the application calling BIO_new() and passing in a pointer to the current BIO_METHOD. The BIO_new() function will allocate the memory for the new BIO, and a pointer to this newly allocated structure will be passed as a parameter to the function. ​BIO_meth_get_destroy() and BIO_meth_set_destroy() get and set the function used for destroying an instance of a BIO respectively. This function will be called in response to the application calling BIO_free(). A pointer to the BIO to be destroyed is passed as a parameter. The destroy function should be used for BIO specific clean up. The memory for the BIO itself should not be freed by this function. ​BIO_meth_get_callback_ctrl() and BIO_meth_set_callback_ctrl() get and set the function used for processing callback ctrl messages in the BIO respectively. See the BIO_callback_ctrl (3) page for more information. This function will be called in response to the application calling BIO_callback_ctrl(). The parameters for the function have the same meaning as for BIO_callback_ctrl().
RETURN VALUES​BIO_get_new_index() returns the new BIO type value or −1 if an error occurred. BIO_meth_new(int type, const char *name) returns a valid BIO_METHOD or NULL if an error occurred. The BIO_meth_set functions return 1 on success or 0 on error. The BIO_meth_get functions return the corresponding function pointers.
SEE ALSObio, BIO_find_type, BIO_ctrl, BIO_read_ex, BIO_new
HISTORYThe functions described here were added in OpenSSL 1.1.0.
COPYRIGHTCopyright 2016−2018 The OpenSSL Project Authors. All Rights Reserved. Licensed under the OpenSSL license (the ‟License”). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <https://www.openssl.org/source/license.html>. 0
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