.\" -*- mode: troff; coding: utf-8 -*- .\" Automatically generated by Pod::Man 5.0102 (Pod::Simple 3.45) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" \*(C` and \*(C' are quotes in nroff, nothing in troff, for use with C<>. .ie n \{\ . ds C` "" . ds C' "" 'br\} .el\{\ . ds C` . ds C' 'br\} .\" .\" Escape single quotes in literal strings from groff's Unicode transform. .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" .\" If the F register is >0, we'll generate index entries on stderr for .\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index .\" entries marked with X<> in POD. Of course, you'll have to process the .\" output yourself in some meaningful fashion. .\" .\" Avoid warning from groff about undefined register 'F'. .de IX .. .nr rF 0 .if \n(.g .if rF .nr rF 1 .if (\n(rF:(\n(.g==0)) \{\ . if \nF \{\ . de IX . tm Index:\\$1\t\\n%\t"\\$2" .. . if !\nF==2 \{\ . nr % 0 . nr F 2 . \} . \} .\} .rr rF .\" ======================================================================== .\" .IX Title "BIO_METH_NEW 3ssl" .TH BIO_METH_NEW 3ssl 2024-10-23 3.4.0 OpenSSL .\" For nroff, turn off justification. Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH NAME BIO_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, BIO_meth_set_sendmmsg, BIO_meth_get_sendmmsg, BIO_meth_set_recvmmsg, BIO_meth_get_recvmmsg \- Routines to build up BIO methods .SH SYNOPSIS .IX Header "SYNOPSIS" .Vb 1 \& #include \& \& 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 *)); \& \& ossl_ssize_t (*BIO_meth_get_sendmmsg(const BIO_METHOD *biom))(BIO *, \& BIO_MSG *, \& size_t, \& size_t, \& uint64_t); \& int BIO_meth_set_sendmmsg(BIO_METHOD *biom, \& ossl_ssize_t (*f) (BIO *, BIO_MSG *, size_t, \& size_t, uint64_t)); \& \& ossl_ssize_t (*BIO_meth_get_recvmmsg(const BIO_METHOD *biom))(BIO *, \& BIO_MSG *, \& size_t, \& size_t, \& uint64_t); \& int BIO_meth_set_recvmmsg(BIO_METHOD *biom, \& ossl_ssize_t (*f) (BIO *, BIO_MSG *, size_t, \& size_t, uint64_t)); .Ve .SH DESCRIPTION .IX Header "DESCRIPTION" The \fBBIO_METHOD\fR 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 \fBbio\fR\|(7) page for more information. .PP \&\fBBIO_meth_new()\fR creates a new \fBBIO_METHOD\fR structure that contains a type identifier \fItype\fR and a string that represents its \fBname\fR. \&\fBtype\fR can be set to either \fBBIO_TYPE_NONE\fR or via \fBBIO_get_new_index()\fR if a unique type is required for searching (See \fBBIO_find_type\fR\|(3)) .PP Note that \fBBIO_get_new_index()\fR can only be used 127 times before it returns an error. .PP The set of standard OpenSSL provided BIO types is provided in \fI\fR. Some examples include \fBBIO_TYPE_BUFFER\fR and \fBBIO_TYPE_CIPHER\fR. Filter BIOs should have a type which have the "filter" bit set (\fBBIO_TYPE_FILTER\fR). Source/sink BIOs should have the "source/sink" bit set (\fBBIO_TYPE_SOURCE_SINK\fR). File descriptor based BIOs (e.g. socket, fd, connect, accept etc) should additionally have the "descriptor" bit set (\fBBIO_TYPE_DESCRIPTOR\fR). See the \&\fBBIO_find_type\fR\|(3) page for more information. .PP \&\fBBIO_meth_free()\fR destroys a \fBBIO_METHOD\fR structure and frees up any memory associated with it. If the argument is NULL, nothing is done. .PP \&\fBBIO_meth_get_write_ex()\fR and \fBBIO_meth_set_write_ex()\fR 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 \fBBIO_write_ex()\fR or \&\fBBIO_write()\fR. The parameters for the function have the same meaning as for \&\fBBIO_write_ex()\fR. Older code may call \fBBIO_meth_get_write()\fR and \&\fBBIO_meth_set_write()\fR instead. Applications should not call both \&\fBBIO_meth_set_write_ex()\fR and \fBBIO_meth_set_write()\fR or call \fBBIO_meth_get_write()\fR when the function was set with \fBBIO_meth_set_write_ex()\fR. .PP \&\fBBIO_meth_get_read_ex()\fR and \fBBIO_meth_set_read_ex()\fR 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 \fBBIO_read_ex()\fR or \fBBIO_read()\fR. The parameters for the function have the same meaning as for \fBBIO_read_ex()\fR. Older code may call \fBBIO_meth_get_read()\fR and \fBBIO_meth_set_read()\fR instead. Applications should not call both \fBBIO_meth_set_read_ex()\fR and \fBBIO_meth_set_read()\fR or call \fBBIO_meth_get_read()\fR when the function was set with \&\fBBIO_meth_set_read_ex()\fR. .PP \&\fBBIO_meth_get_puts()\fR and \fBBIO_meth_set_puts()\fR 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 \fBBIO_puts()\fR. The parameters for the function have the same meaning as for \fBBIO_puts()\fR. .PP \&\fBBIO_meth_get_gets()\fR and \fBBIO_meth_set_gets()\fR get and set the function typically used for reading a line of data from the BIO respectively (see the \fBBIO_gets\fR\|(3) page for more information). This function will be called in response to the application calling \fBBIO_gets()\fR. The parameters for the function have the same meaning as for \fBBIO_gets()\fR. .PP \&\fBBIO_meth_get_ctrl()\fR and \fBBIO_meth_set_ctrl()\fR get and set the function used for processing ctrl messages in the BIO respectively. See the \fBBIO_ctrl\fR\|(3) page for more information. This function will be called in response to the application calling \fBBIO_ctrl()\fR. The parameters for the function have the same meaning as for \&\fBBIO_ctrl()\fR. .PP \&\fBBIO_meth_get_create()\fR and \fBBIO_meth_set_create()\fR 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 \fBBIO_new()\fR and passing in a pointer to the current BIO_METHOD. The \fBBIO_new()\fR 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. If a create function is set, \&\fBBIO_new()\fR will not mark the BIO as initialised on allocation. \&\fBBIO_set_init\fR\|(3) must then be called either by the create function, or later, by a BIO ctrl function, once BIO initialisation is complete. .PP \&\fBBIO_meth_get_destroy()\fR and \fBBIO_meth_set_destroy()\fR 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 \fBBIO_free()\fR. 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. .PP \&\fBBIO_meth_get_callback_ctrl()\fR and \fBBIO_meth_set_callback_ctrl()\fR get and set the function used for processing callback ctrl messages in the BIO respectively. See the \fBBIO_callback_ctrl\fR\|(3) page for more information. This function will be called in response to the application calling \fBBIO_callback_ctrl()\fR. The parameters for the function have the same meaning as for \fBBIO_callback_ctrl()\fR. .PP \&\fBBIO_meth_get_sendmmsg()\fR, \fBBIO_meth_set_sendmmsg()\fR, \fBBIO_meth_get_recvmmsg()\fR and \&\fBBIO_meth_set_recvmmsg()\fR get and set the functions used for handling \&\fBBIO_sendmmsg()\fR and \fBBIO_recvmmsg()\fR calls respectively. See \fBBIO_sendmmsg\fR\|(3) for more information. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBBIO_get_new_index()\fR returns the new BIO type value or \-1 if an error occurred. .PP BIO_meth_new(int type, const char *name) returns a valid \fBBIO_METHOD\fR or NULL if an error occurred. .PP The \fBBIO_meth_set\fR functions return 1 on success or 0 on error. .PP The \fBBIO_meth_get\fR functions return the corresponding function pointers. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBbio\fR\|(7), \fBBIO_find_type\fR\|(3), \fBBIO_ctrl\fR\|(3), \fBBIO_read_ex\fR\|(3), \fBBIO_new\fR\|(3) .SH HISTORY .IX Header "HISTORY" The functions described here were added in OpenSSL 1.1.0. .SH COPYRIGHT .IX Header "COPYRIGHT" Copyright 2016\-2024 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the Apache License 2.0 (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 .