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131 .IX Title "BIO_METH_NEW 3"
132 .TH BIO_METH_NEW 3 "2018-11-20" "1.1.1a" "OpenSSL"
133 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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138 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 \- Routines to build up BIO methods
140 .IX Header "SYNOPSIS"
142 \& #include <openssl/bio.h>
144 \& int BIO_get_new_index(void);
146 \& BIO_METHOD *BIO_meth_new(int type, const char *name);
148 \& void BIO_meth_free(BIO_METHOD *biom);
150 \& int (*BIO_meth_get_write_ex(const BIO_METHOD *biom))(BIO *, const char *, size_t,
152 \& int (*BIO_meth_get_write(const BIO_METHOD *biom))(BIO *, const char *, int);
153 \& int BIO_meth_set_write_ex(BIO_METHOD *biom,
154 \& int (*bwrite)(BIO *, const char *, size_t, size_t *));
155 \& int BIO_meth_set_write(BIO_METHOD *biom,
156 \& int (*write)(BIO *, const char *, int));
158 \& int (*BIO_meth_get_read_ex(const BIO_METHOD *biom))(BIO *, char *, size_t, size_t *);
159 \& int (*BIO_meth_get_read(const BIO_METHOD *biom))(BIO *, char *, int);
160 \& int BIO_meth_set_read_ex(BIO_METHOD *biom,
161 \& int (*bread)(BIO *, char *, size_t, size_t *));
162 \& int BIO_meth_set_read(BIO_METHOD *biom, int (*read)(BIO *, char *, int));
164 \& int (*BIO_meth_get_puts(const BIO_METHOD *biom))(BIO *, const char *);
165 \& int BIO_meth_set_puts(BIO_METHOD *biom, int (*puts)(BIO *, const char *));
167 \& int (*BIO_meth_get_gets(const BIO_METHOD *biom))(BIO *, char *, int);
168 \& int BIO_meth_set_gets(BIO_METHOD *biom,
169 \& int (*gets)(BIO *, char *, int));
171 \& long (*BIO_meth_get_ctrl(const BIO_METHOD *biom))(BIO *, int, long, void *);
172 \& int BIO_meth_set_ctrl(BIO_METHOD *biom,
173 \& long (*ctrl)(BIO *, int, long, void *));
175 \& int (*BIO_meth_get_create(const BIO_METHOD *bion))(BIO *);
176 \& int BIO_meth_set_create(BIO_METHOD *biom, int (*create)(BIO *));
178 \& int (*BIO_meth_get_destroy(const BIO_METHOD *biom))(BIO *);
179 \& int BIO_meth_set_destroy(BIO_METHOD *biom, int (*destroy)(BIO *));
181 \& long (*BIO_meth_get_callback_ctrl(const BIO_METHOD *biom))(BIO *, int, BIO_info_cb *);
182 \& int BIO_meth_set_callback_ctrl(BIO_METHOD *biom,
183 \& long (*callback_ctrl)(BIO *, int, BIO_info_cb *));
186 .IX Header "DESCRIPTION"
187 The \fB\s-1BIO_METHOD\s0\fR type is a structure used for the implementation of new \s-1BIO\s0
188 types. It provides a set of functions used by OpenSSL for the implementation
189 of the various \s-1BIO\s0 capabilities. See the bio page for more information.
191 \&\fIBIO_meth_new()\fR creates a new \fB\s-1BIO_METHOD\s0\fR structure. It should be given a
192 unique integer \fBtype\fR and a string that represents its \fBname\fR.
193 Use \fIBIO_get_new_index()\fR to get the value for \fBtype\fR.
196 standard OpenSSL provided \s-1BIO\s0 types is provided in \fBbio.h\fR. Some examples
197 include \fB\s-1BIO_TYPE_BUFFER\s0\fR and \fB\s-1BIO_TYPE_CIPHER\s0\fR. Filter BIOs should have a
198 type which have the \*(L"filter\*(R" bit set (\fB\s-1BIO_TYPE_FILTER\s0\fR). Source/sink BIOs
199 should have the \*(L"source/sink\*(R" bit set (\fB\s-1BIO_TYPE_SOURCE_SINK\s0\fR). File descriptor
200 based BIOs (e.g. socket, fd, connect, accept etc) should additionally have the
201 \&\*(L"descriptor\*(R" bit set (\fB\s-1BIO_TYPE_DESCRIPTOR\s0\fR). See the BIO_find_type page for
204 \&\fIBIO_meth_free()\fR destroys a \fB\s-1BIO_METHOD\s0\fR structure and frees up any memory
207 \&\fIBIO_meth_get_write_ex()\fR and \fIBIO_meth_set_write_ex()\fR get and set the function
208 used for writing arbitrary length data to the \s-1BIO\s0 respectively. This function
209 will be called in response to the application calling \fIBIO_write_ex()\fR or
210 \&\fIBIO_write()\fR. The parameters for the function have the same meaning as for
211 \&\fIBIO_write_ex()\fR. Older code may call \fIBIO_meth_get_write()\fR and
212 \&\fIBIO_meth_set_write()\fR instead. Applications should not call both
213 \&\fIBIO_meth_set_write_ex()\fR and \fIBIO_meth_set_write()\fR or call \fIBIO_meth_get_write()\fR
214 when the function was set with \fIBIO_meth_set_write_ex()\fR.
216 \&\fIBIO_meth_get_read_ex()\fR and \fIBIO_meth_set_read_ex()\fR get and set the function used
217 for reading arbitrary length data from the \s-1BIO\s0 respectively. This function will
218 be called in response to the application calling \fIBIO_read_ex()\fR or \fIBIO_read()\fR.
219 The parameters for the function have the same meaning as for \fIBIO_read_ex()\fR.
220 Older code may call \fIBIO_meth_get_read()\fR and \fIBIO_meth_set_read()\fR instead.
221 Applications should not call both \fIBIO_meth_set_read_ex()\fR and \fIBIO_meth_set_read()\fR
222 or call \fIBIO_meth_get_read()\fR when the function was set with
223 \&\fIBIO_meth_set_read_ex()\fR.
225 \&\fIBIO_meth_get_puts()\fR and \fIBIO_meth_set_puts()\fR get and set the function used for
226 writing a \s-1NULL\s0 terminated string to the \s-1BIO\s0 respectively. This function will be
227 called in response to the application calling \fIBIO_puts()\fR. The parameters for
228 the function have the same meaning as for \fIBIO_puts()\fR.
230 \&\fIBIO_meth_get_gets()\fR and \fIBIO_meth_set_gets()\fR get and set the function typically
231 used for reading a line of data from the \s-1BIO\s0 respectively (see the \fIBIO_gets\fR\|(3)
232 page for more information). This function will be called in response to the
233 application calling \fIBIO_gets()\fR. The parameters for the function have the same
234 meaning as for \fIBIO_gets()\fR.
236 \&\fIBIO_meth_get_ctrl()\fR and \fIBIO_meth_set_ctrl()\fR get and set the function used for
237 processing ctrl messages in the \s-1BIO\s0 respectively. See the BIO_ctrl page for
238 more information. This function will be called in response to the application
239 calling \fIBIO_ctrl()\fR. The parameters for the function have the same meaning as for
242 \&\fIBIO_meth_get_create()\fR and \fIBIO_meth_set_create()\fR get and set the function used
243 for creating a new instance of the \s-1BIO\s0 respectively. This function will be
244 called in response to the application calling \fIBIO_new()\fR and passing
245 in a pointer to the current \s-1BIO_METHOD.\s0 The \fIBIO_new()\fR function will allocate the
246 memory for the new \s-1BIO,\s0 and a pointer to this newly allocated structure will
247 be passed as a parameter to the function.
249 \&\fIBIO_meth_get_destroy()\fR and \fIBIO_meth_set_destroy()\fR get and set the function used
250 for destroying an instance of a \s-1BIO\s0 respectively. This function will be
251 called in response to the application calling \fIBIO_free()\fR. A pointer to the \s-1BIO\s0
252 to be destroyed is passed as a parameter. The destroy function should be used
253 for \s-1BIO\s0 specific clean up. The memory for the \s-1BIO\s0 itself should not be freed by
256 \&\fIBIO_meth_get_callback_ctrl()\fR and \fIBIO_meth_set_callback_ctrl()\fR get and set the
257 function used for processing callback ctrl messages in the \s-1BIO\s0 respectively. See
258 the \fIBIO_callback_ctrl\fR\|(3) page for more information. This function will be called
259 in response to the application calling \fIBIO_callback_ctrl()\fR. The parameters for
260 the function have the same meaning as for \fIBIO_callback_ctrl()\fR.
262 .IX Header "RETURN VALUES"
263 \&\fIBIO_get_new_index()\fR returns the new \s-1BIO\s0 type value or \-1 if an error occurred.
265 BIO_meth_new(int type, const char *name) returns a valid \fB\s-1BIO_METHOD\s0\fR or \s-1NULL\s0
266 if an error occurred.
268 The \fBBIO_meth_set\fR functions return 1 on success or 0 on error.
270 The \fBBIO_meth_get\fR functions return the corresponding function pointers.
272 .IX Header "SEE ALSO"
273 bio, BIO_find_type, BIO_ctrl, BIO_read_ex, BIO_new
276 The functions described here were added in OpenSSL 1.1.0.
278 .IX Header "COPYRIGHT"
279 Copyright 2016\-2018 The OpenSSL Project Authors. All Rights Reserved.
281 Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
282 this file except in compliance with the License. You can obtain a copy
283 in the file \s-1LICENSE\s0 in the source distribution or at
284 <https://www.openssl.org/source/license.html>.