1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to. The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
25 * 1. Redistributions of source code must retain the copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * "This product includes cryptographic software written by
33 * Eric Young (eay@cryptsoft.com)"
34 * The word 'cryptographic' can be left out if the rouines from the library
35 * being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed. i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.] */
57 #ifndef OPENSSL_HEADER_BIO_H
58 #define OPENSSL_HEADER_BIO_H
60 #include <openssl/base.h>
63 #include <stdio.h> /* For FILE */
65 #include <openssl/ex_data.h>
66 #include <openssl/stack.h>
68 #if defined(__cplusplus)
73 /* BIO abstracts over a file-descriptor like interface. */
76 /* Allocation and freeing. */
80 /* BIO_new creates a new BIO with the given type and a reference count of one.
81 * It returns the fresh |BIO|, or NULL on error. */
82 OPENSSL_EXPORT BIO *BIO_new(const BIO_METHOD *type);
84 /* BIO_free decrements the reference count of |bio|. If the reference count
85 * drops to zero, it (optionally) calls the BIO's callback with |BIO_CB_FREE|,
86 * frees the ex_data and then, if the BIO has a destroy callback for the
87 * method, calls it. Finally it frees |bio| itself. It then repeats that for
88 * the next BIO in the chain, if any.
90 * It returns one on success or zero otherwise. */
91 OPENSSL_EXPORT int BIO_free(BIO *bio);
93 /* BIO_vfree performs the same actions as |BIO_free|, but has a void return
94 * value. This is provided for API-compat.
96 * TODO(fork): remove. */
97 OPENSSL_EXPORT void BIO_vfree(BIO *bio);
102 /* BIO_read attempts to read |len| bytes into |data|. It returns the number of
103 * bytes read, zero on EOF, or a negative number on error. */
104 OPENSSL_EXPORT int BIO_read(BIO *bio, void *data, int len);
106 /* BIO_gets "reads a line" from |bio| and puts at most |size| bytes into |buf|.
107 * It returns the number of bytes read or a negative number on error. The
108 * phrase "reads a line" is in quotes in the previous sentence because the
109 * exact operation depends on the BIO's method. For example, a digest BIO will
110 * return the digest in response to a |BIO_gets| call.
112 * TODO(fork): audit the set of BIOs that we end up needing. If all actually
113 * return a line for this call, remove the warning above. */
114 OPENSSL_EXPORT int BIO_gets(BIO *bio, char *buf, int size);
116 /* BIO_write writes |len| bytes from |data| to BIO. It returns the number of
117 * bytes written or a negative number on error. */
118 OPENSSL_EXPORT int BIO_write(BIO *bio, const void *data, int len);
120 /* BIO_puts writes a NUL terminated string from |buf| to |bio|. It returns the
121 * number of bytes written or a negative number on error. */
122 OPENSSL_EXPORT int BIO_puts(BIO *bio, const char *buf);
124 /* BIO_flush flushes any buffered output. It returns one on success and zero
126 OPENSSL_EXPORT int BIO_flush(BIO *bio);
129 /* Low-level control functions.
131 * These are generic functions for sending control requests to a BIO. In
132 * general one should use the wrapper functions like |BIO_get_close|. */
134 /* BIO_ctrl sends the control request |cmd| to |bio|. The |cmd| argument should
135 * be one of the |BIO_C_*| values. */
136 OPENSSL_EXPORT long BIO_ctrl(BIO *bio, int cmd, long larg, void *parg);
138 /* BIO_ptr_ctrl acts like |BIO_ctrl| but passes the address of a |void*|
139 * pointer as |parg| and returns the value that is written to it, or NULL if
140 * the control request returns <= 0. */
141 OPENSSL_EXPORT char *BIO_ptr_ctrl(BIO *bp, int cmd, long larg);
143 /* BIO_int_ctrl acts like |BIO_ctrl| but passes the address of a copy of |iarg|
145 OPENSSL_EXPORT long BIO_int_ctrl(BIO *bp, int cmd, long larg, int iarg);
147 /* BIO_reset resets |bio| to its initial state, the precise meaning of which
148 * depends on the concrete type of |bio|. It returns one on success and zero
150 OPENSSL_EXPORT int BIO_reset(BIO *bio);
152 /* BIO_set_flags ORs |flags| with |bio->flags|. */
153 OPENSSL_EXPORT void BIO_set_flags(BIO *bio, int flags);
155 /* BIO_test_flags returns |bio->flags| AND |flags|. */
156 OPENSSL_EXPORT int BIO_test_flags(const BIO *bio, int flags);
158 /* BIO_should_read returns non-zero if |bio| encountered a temporary error
159 * while reading (i.e. EAGAIN), indicating that the caller should retry the
161 OPENSSL_EXPORT int BIO_should_read(const BIO *bio);
163 /* BIO_should_write returns non-zero if |bio| encountered a temporary error
164 * while writing (i.e. EAGAIN), indicating that the caller should retry the
166 OPENSSL_EXPORT int BIO_should_write(const BIO *bio);
168 /* BIO_should_retry returns non-zero if the reason that caused a failed I/O
169 * operation is temporary and thus the operation should be retried. Otherwise,
170 * it was a permanent error and it returns zero. */
171 OPENSSL_EXPORT int BIO_should_retry(const BIO *bio);
173 /* BIO_should_io_special returns non-zero if |bio| encountered a temporary
174 * error while performing a special I/O operation, indicating that the caller
175 * should retry. The operation that caused the error is returned by
176 * |BIO_get_retry_reason|. */
177 OPENSSL_EXPORT int BIO_should_io_special(const BIO *bio);
179 /* BIO_RR_SSL_X509_LOOKUP indicates that an SSL BIO blocked because the SSL
180 * library returned with SSL_ERROR_WANT_X509_LOOKUP.
182 * TODO(fork): remove. */
183 #define BIO_RR_SSL_X509_LOOKUP 0x01
185 /* BIO_RR_CONNECT indicates that a connect would have blocked */
186 #define BIO_RR_CONNECT 0x02
188 /* BIO_RR_ACCEPT indicates that an accept would have blocked */
189 #define BIO_RR_ACCEPT 0x03
191 /* BIO_RR_SSL_CHANNEL_ID_LOOKUP indicates that the ChannelID code cannot find
192 * a private key for a TLS connection. */
193 #define BIO_RR_SSL_CHANNEL_ID_LOOKUP 0x04
195 /* BIO_get_retry_reason returns the special I/O operation that needs to be
196 * retried. The return value is one of the |BIO_RR_*| values. */
197 OPENSSL_EXPORT int BIO_get_retry_reason(const BIO *bio);
199 /* BIO_clear_flags ANDs |bio->flags| with the bitwise-complement of |flags|. */
200 OPENSSL_EXPORT void BIO_clear_flags(BIO *bio, int flags);
202 /* BIO_set_retry_read sets the |BIO_FLAGS_READ| and |BIO_FLAGS_SHOULD_RETRY|
204 OPENSSL_EXPORT void BIO_set_retry_read(BIO *bio);
206 /* BIO_set_retry_read sets the |BIO_FLAGS_WRITE| and |BIO_FLAGS_SHOULD_RETRY|
208 OPENSSL_EXPORT void BIO_set_retry_write(BIO *bio);
210 /* BIO_get_retry_flags gets the |BIO_FLAGS_READ|, |BIO_FLAGS_WRITE|,
211 * |BIO_FLAGS_IO_SPECIAL| and |BIO_FLAGS_SHOULD_RETRY| flags from |bio|. */
212 OPENSSL_EXPORT int BIO_get_retry_flags(BIO *bio);
214 /* BIO_clear_retry_flags clears the |BIO_FLAGS_READ|, |BIO_FLAGS_WRITE|,
215 * |BIO_FLAGS_IO_SPECIAL| and |BIO_FLAGS_SHOULD_RETRY| flags from |bio|. */
216 OPENSSL_EXPORT void BIO_clear_retry_flags(BIO *bio);
218 /* BIO_method_type returns the type of |bio|, which is one of the |BIO_TYPE_*|
220 OPENSSL_EXPORT int BIO_method_type(const BIO *bio);
222 /* bio_info_cb is the type of a callback function that can be called for most
223 * BIO operations. The |event| argument is one of |BIO_CB_*| and can be ORed
224 * with |BIO_CB_RETURN| if the callback is being made after the operation in
225 * question. In that case, |return_value| will contain the return value from
227 typedef long (*bio_info_cb)(BIO *bio, int event, const char *parg, int cmd,
228 long larg, long return_value);
230 /* BIO_callback_ctrl allows the callback function to be manipulated. The |cmd|
231 * arg will generally be |BIO_CTRL_SET_CALLBACK| but arbitary command values
232 * can be interpreted by the |BIO|. */
233 OPENSSL_EXPORT long BIO_callback_ctrl(BIO *bio, int cmd, bio_info_cb fp);
235 /* BIO_pending returns the number of bytes pending to be read. */
236 OPENSSL_EXPORT size_t BIO_pending(const BIO *bio);
238 /* BIO_ctrl_pending calls |BIO_pending| and exists only for compatibility with
240 OPENSSL_EXPORT size_t BIO_ctrl_pending(const BIO *bio);
242 /* BIO_wpending returns the number of bytes pending to be written. */
243 OPENSSL_EXPORT size_t BIO_wpending(const BIO *bio);
245 /* BIO_set_close sets the close flag for |bio|. The meaning of which depends on
246 * the type of |bio| but, for example, a memory BIO interprets the close flag
247 * as meaning that it owns its buffer. It returns one on success and zero
249 OPENSSL_EXPORT int BIO_set_close(BIO *bio, int close_flag);
251 /* BIO_set_callback sets a callback function that will be called before and
252 * after most operations. See the comment above |bio_info_cb|. */
253 OPENSSL_EXPORT void BIO_set_callback(BIO *bio, bio_info_cb callback_func);
255 /* BIO_set_callback_arg sets the opaque pointer value that can be read within a
256 * callback with |BIO_get_callback_arg|. */
257 OPENSSL_EXPORT void BIO_set_callback_arg(BIO *bio, char *arg);
259 /* BIO_get_callback_arg returns the last value of the opaque callback pointer
260 * set by |BIO_set_callback_arg|. */
261 OPENSSL_EXPORT char *BIO_get_callback_arg(const BIO *bio);
263 /* BIO_number_read returns the number of bytes that have been read from
265 OPENSSL_EXPORT size_t BIO_number_read(const BIO *bio);
267 /* BIO_number_written returns the number of bytes that have been written to
269 OPENSSL_EXPORT size_t BIO_number_written(const BIO *bio);
272 /* Managing chains of BIOs.
274 * BIOs can be put into chains where the output of one is used as the input of
275 * the next etc. The most common case is a buffering BIO, which accepts and
276 * buffers writes until flushed into the next BIO in the chain. */
278 /* BIO_push adds |appended_bio| to the end of the chain with |bio| at the head.
279 * It returns |bio|. Note that |appended_bio| may be the head of a chain itself
280 * and thus this function can be used to join two chains.
282 * BIO_push takes ownership of the caller's reference to |appended_bio|. */
283 OPENSSL_EXPORT BIO *BIO_push(BIO *bio, BIO *appended_bio);
285 /* BIO_pop removes |bio| from the head of a chain and returns the next BIO in
286 * the chain, or NULL if there is no next BIO.
288 * The caller takes ownership of the chain's reference to |bio|. */
289 OPENSSL_EXPORT BIO *BIO_pop(BIO *bio);
291 /* BIO_next returns the next BIO in the chain after |bio|, or NULL if there is
293 OPENSSL_EXPORT BIO *BIO_next(BIO *bio);
295 /* BIO_free_all calls |BIO_free|.
297 * TODO(fork): update callers and remove. */
298 OPENSSL_EXPORT void BIO_free_all(BIO *bio);
300 /* BIO_find_type walks a chain of BIOs and returns the first that matches
301 * |type|, which is one of the |BIO_TYPE_*| values. */
302 OPENSSL_EXPORT BIO *BIO_find_type(BIO *bio, int type);
304 /* BIO_copy_next_retry sets the retry flags and |retry_reason| of |bio| from
305 * the next BIO in the chain. */
306 OPENSSL_EXPORT void BIO_copy_next_retry(BIO *bio);
311 * These functions are versions of printf functions that output to a BIO rather
314 #define __bio_h__attr__ __attribute__
316 #define __bio_h__attr__(x)
318 OPENSSL_EXPORT int BIO_printf(BIO *bio, const char *format, ...)
319 __bio_h__attr__((__format__(__printf__, 2, 3)));
320 #undef __bio_h__attr__
323 /* Utility functions. */
325 /* BIO_indent prints min(|indent|, |max_indent|) spaces. It returns one on
326 * success and zero otherwise. */
327 OPENSSL_EXPORT int BIO_indent(BIO *bio, unsigned indent, unsigned max_indent);
329 /* BIO_hexdump writes a hex dump of |data| to |bio|. Each line will be indented
330 * by |indent| spaces. */
331 OPENSSL_EXPORT int BIO_hexdump(BIO *bio, const uint8_t *data, size_t len,
334 /* BIO_print_errors_fp prints the current contents of the error stack to |out|
335 * using human readable strings where possible. */
336 OPENSSL_EXPORT void BIO_print_errors_fp(FILE *out);
338 /* BIO_print_errors prints the current contents of the error stack to |bio|
339 * using human readable strings where possible. */
340 OPENSSL_EXPORT void BIO_print_errors(BIO *bio);
345 * Memory BIOs can be used as a read-only source (with |BIO_new_mem_buf|) or a
346 * writable sink (with |BIO_new|, |BIO_s_mem| and |BIO_get_mem_buf|). Data
347 * written to a writable, memory BIO can be recalled by reading from it.
349 * Calling |BIO_reset| on a read-only BIO resets it to the original contents.
350 * On a writable BIO, it clears any data.
352 * If the close flag is set to |BIO_NOCLOSE| (not the default) then the
353 * underlying |BUF_MEM| will not be freed when the |BIO| is freed.
355 * Memory BIOs support |BIO_gets| and |BIO_puts|.
357 * |BIO_eof| is true if no data is in the BIO.
359 * |BIO_ctrl_pending| returns the number of bytes currently stored. */
361 /* BIO_s_mem returns a |BIO_METHOD| that uses a in-memory buffer. */
362 OPENSSL_EXPORT const BIO_METHOD *BIO_s_mem(void);
364 /* BIO_new_mem_buf creates BIO that reads and writes from |len| bytes at |buf|.
365 * It does not take ownership of |buf|. It returns the BIO or NULL on error.
367 * If |len| is negative, then |buf| is treated as a NUL-terminated string, but
368 * don't depend on this in new code. */
369 OPENSSL_EXPORT BIO *BIO_new_mem_buf(void *buf, int len);
371 /* BIO_mem_contents sets |*out_contents| to point to the current contents of
372 * |bio| and |*out_len| to contain the length of that data. It returns one on
373 * success and zero otherwise. */
374 OPENSSL_EXPORT int BIO_mem_contents(const BIO *bio,
375 const uint8_t **out_contents,
378 /* BIO_get_mem_data sets |*contents| to point to the current contents of |bio|
379 * and returns the length of the data.
381 * WARNING: don't use this, use |BIO_mem_contents|. A return value of zero from
382 * this function can mean either that it failed or that the memory buffer is
384 OPENSSL_EXPORT long BIO_get_mem_data(BIO *bio, char **contents);
386 /* BIO_get_mem_ptr sets |*out| to a BUF_MEM containing the current contents of
387 * |bio|. It returns one on success or zero on error. */
388 OPENSSL_EXPORT int BIO_get_mem_ptr(BIO *bio, BUF_MEM **out);
390 /* BIO_set_mem_buf sets |b| as the contents of |bio|. If |take_ownership| is
391 * non-zero, then |b| will be freed when |bio| is closed. Returns one on
392 * success or zero otherwise. */
393 OPENSSL_EXPORT int BIO_set_mem_buf(BIO *bio, BUF_MEM *b, int take_ownership);
395 /* BIO_set_mem_eof_return sets the value that will be returned from reading
396 * |bio| when empty. If |eof_value| is zero then an empty memory BIO will
397 * return EOF (that is it will return zero and |BIO_should_retry| will be
398 * false). If |eof_value| is non zero then it will return |eof_value| when it
399 * is empty and it will set the read retry flag (that is |BIO_read_retry| is
400 * true). To avoid ambiguity with a normal positive return value, |eof_value|
401 * should be set to a negative value, typically -1.
403 * For a read-only BIO, the default is zero (EOF). For a writable BIO, the
404 * default is -1 so that additional data can be written once exhausted. */
405 OPENSSL_EXPORT int BIO_set_mem_eof_return(BIO *bio, int eof_value);
408 /* File descriptor BIOs.
410 * File descriptor BIOs are wrappers around the system's |read| and |write|
411 * functions. If the close flag is set then then |close| is called on the
412 * underlying file descriptor when the BIO is freed.
414 * |BIO_reset| attempts to seek the file pointer to the start of file using
417 * |BIO_seek| sets the file pointer to position |off| from start of file using
420 * |BIO_tell| returns the current file position. */
422 /* BIO_s_fd returns a |BIO_METHOD| for file descriptor fds. */
423 OPENSSL_EXPORT const BIO_METHOD *BIO_s_fd(void);
425 /* BIO_new_fd creates a new file descriptor BIO wrapping |fd|. If |close_flag|
426 * is non-zero, then |fd| will be closed when the BIO is. */
427 OPENSSL_EXPORT BIO *BIO_new_fd(int fd, int close_flag);
429 /* BIO_set_fd sets the file descriptor of |bio| to |fd|. If |close_flag| is
430 * non-zero then |fd| will be closed when |bio| is. It returns one on success
431 * or zero on error. */
432 OPENSSL_EXPORT int BIO_set_fd(BIO *bio, int fd, int close_flag);
434 /* BIO_get_fd sets |*out_fd| to the file descriptor currently in use by |bio|.
435 * It returns one on success and zero on error. */
436 OPENSSL_EXPORT int BIO_get_fd(BIO *bio, int *out_fd);
441 * File BIOs are wrappers around a C |FILE| object.
443 * |BIO_flush| on a file BIO calls |fflush| on the wrapped stream.
445 * |BIO_reset| attempts to seek the file pointer to the start of file using
448 * |BIO_seek| sets the file pointer to the given position from the start of
449 * file using |fseek|.
451 * |BIO_eof| calls |feof|.
453 * Setting the close flag causes |fclose| to be called on the stream when the
456 /* BIO_s_file returns a BIO_METHOD that wraps a |FILE|. */
457 OPENSSL_EXPORT const BIO_METHOD *BIO_s_file(void);
459 /* BIO_new_file creates a file BIO by opening |filename| with the given mode.
460 * See the |fopen| manual page for details of the mode argument. */
461 OPENSSL_EXPORT BIO *BIO_new_file(const char *filename, const char *mode);
463 /* BIO_new_fp creates a new file BIO that wraps the given |FILE|. If
464 * |close_flag| is |BIO_CLOSE|, then |fclose| will be called on |stream| when
465 * the BIO is closed. */
466 OPENSSL_EXPORT BIO *BIO_new_fp(FILE *stream, int close_flag);
468 /* BIO_get_fp sets |*out_file| to the current |FILE| for |bio|. It returns one
469 * on success and zero otherwise. */
470 OPENSSL_EXPORT int BIO_get_fp(BIO *bio, FILE **out_file);
472 /* BIO_set_fp sets the |FILE| for |bio|. If |close_flag| is |BIO_CLOSE| then
473 * |fclose| will be called on |file| when |bio| is closed. It returns one on
474 * sucess and zero otherwise. */
475 OPENSSL_EXPORT int BIO_set_fp(BIO *bio, FILE *file, int close_flag);
477 /* BIO_read_filename opens |filename| for reading and sets the result as the
478 * |FILE| for |bio|. It returns one on success and zero otherwise. The |FILE|
479 * will be closed when |bio| is freed. */
480 OPENSSL_EXPORT int BIO_read_filename(BIO *bio, const char *filename);
482 /* BIO_write_filename opens |filename| for writing and sets the result as the
483 * |FILE| for |bio|. It returns one on success and zero otherwise. The |FILE|
484 * will be closed when |bio| is freed. */
485 OPENSSL_EXPORT int BIO_write_filename(BIO *bio, const char *filename);
487 /* BIO_append_filename opens |filename| for appending and sets the result as
488 * the |FILE| for |bio|. It returns one on success and zero otherwise. The
489 * |FILE| will be closed when |bio| is freed. */
490 OPENSSL_EXPORT int BIO_append_filename(BIO *bio, const char *filename);
492 /* BIO_rw_filename opens |filename| for reading and writing and sets the result
493 * as the |FILE| for |bio|. It returns one on success and zero otherwise. The
494 * |FILE| will be closed when |bio| is freed. */
495 OPENSSL_EXPORT int BIO_rw_filename(BIO *bio, const char *filename);
500 * Buffer BIOs are a filter-type BIO, i.e. they are designed to be used in a
501 * chain of BIOs. They provide buffering to reduce the number of operations on
502 * the underlying BIOs. */
504 OPENSSL_EXPORT const BIO_METHOD *BIO_f_buffer(void);
506 /* BIO_set_read_buffer_size sets the size, in bytes, of the read buffer and
507 * clears it. It returns one on success and zero on failure. */
508 OPENSSL_EXPORT int BIO_set_read_buffer_size(BIO *bio, int buffer_size);
510 /* BIO_set_write_buffer_size sets the size, in bytes, of the write buffer and
511 * clears it. It returns one on success and zero on failure. */
512 OPENSSL_EXPORT int BIO_set_write_buffer_size(BIO *bio, int buffer_size);
517 OPENSSL_EXPORT const BIO_METHOD *BIO_s_socket(void);
519 /* BIO_new_socket allocates and initialises a fresh BIO which will read and
520 * write to the socket |fd|. If |close_flag| is |BIO_CLOSE| then closing the
521 * BIO will close |fd|. It returns the fresh |BIO| or NULL on error. */
522 OPENSSL_EXPORT BIO *BIO_new_socket(int fd, int close_flag);
527 * A connection BIO creates a network connection and transfers data over the
528 * resulting socket. */
530 OPENSSL_EXPORT const BIO_METHOD *BIO_s_connect(void);
532 /* BIO_new_connect returns a BIO that connects to the given hostname and port.
533 * The |host_and_optional_port| argument should be of the form
534 * "www.example.com" or "www.example.com:443". If the port is omitted, it must
535 * be provided with |BIO_set_conn_port|.
537 * It returns the new BIO on success, or NULL on error. */
538 OPENSSL_EXPORT BIO *BIO_new_connect(const char *host_and_optional_port);
540 /* BIO_set_conn_hostname sets |host_and_optional_port| as the hostname and
541 * optional port that |bio| will connect to. If the port is omitted, it must be
542 * provided with |BIO_set_conn_port|.
544 * It returns one on success and zero otherwise. */
545 OPENSSL_EXPORT int BIO_set_conn_hostname(BIO *bio,
546 const char *host_and_optional_port);
548 /* BIO_set_conn_port sets |port_str| as the port or service name that |bio|
549 * will connect to. It returns one on success and zero otherwise. */
550 OPENSSL_EXPORT int BIO_set_conn_port(BIO *bio, const char *port_str);
552 /* BIO_set_nbio sets whether |bio| will use non-blocking I/O operations. It
553 * returns one on success and zero otherwise. */
554 OPENSSL_EXPORT int BIO_set_nbio(BIO *bio, int on);
559 * TODO(fork): not implemented. */
561 #define BIO_CTRL_DGRAM_QUERY_MTU 40 /* as kernel for current MTU */
563 #define BIO_CTRL_DGRAM_SET_MTU 42 /* set cached value for MTU. want to use
564 this if asking the kernel fails */
566 #define BIO_CTRL_DGRAM_MTU_EXCEEDED 43 /* check whether the MTU was exceed in
567 the previous write operation. */
569 #define BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT \
570 45 /* Next DTLS handshake timeout to adjust socket timeouts */
572 #define BIO_CTRL_DGRAM_GET_PEER 46
574 #define BIO_CTRL_DGRAM_GET_FALLBACK_MTU 47
579 * BIO pairs provide a "loopback" like system: a pair of BIOs where data
580 * written to one can be read from the other and vice versa. */
582 /* BIO_new_bio_pair sets |*out1| and |*out2| to two freshly created BIOs where
583 * data written to one can be read from the other and vice versa. The
584 * |writebuf1| argument gives the size of the buffer used in |*out1| and
585 * |writebuf2| for |*out2|. It returns one on success and zero on error. */
586 OPENSSL_EXPORT int BIO_new_bio_pair(BIO **out1, size_t writebuf1, BIO **out2,
589 /* BIO_s_bio returns the method for a BIO pair. */
590 OPENSSL_EXPORT const BIO_METHOD *BIO_s_bio(void);
592 /* BIO_ctrl_get_read_request returns the number of bytes that the other side of
593 * |bio| tried (unsuccessfully) to read. */
594 OPENSSL_EXPORT size_t BIO_ctrl_get_read_request(BIO *bio);
596 /* BIO_ctrl_get_write_guarantee returns the number of bytes that |bio| (which
597 * must have been returned by |BIO_new_bio_pair|) will accept on the next
598 * |BIO_write| call. */
599 OPENSSL_EXPORT size_t BIO_ctrl_get_write_guarantee(BIO *bio);
601 /* BIO_shutdown_wr marks |bio| as closed, from the point of view of the other
602 * side of the pair. Future |BIO_write| calls on |bio| will fail. It returns
603 * one on success and zero otherwise. */
604 OPENSSL_EXPORT int BIO_shutdown_wr(BIO *bio);
607 /* BIO_NOCLOSE and |BIO_CLOSE| can be used as symbolic arguments when a "close
608 * flag" is passed to a BIO function. */
609 #define BIO_NOCLOSE 0
612 /* These are passed to the BIO callback */
613 #define BIO_CB_FREE 0x01
614 #define BIO_CB_READ 0x02
615 #define BIO_CB_WRITE 0x03
616 #define BIO_CB_PUTS 0x04
617 #define BIO_CB_GETS 0x05
618 #define BIO_CB_CTRL 0x06
620 /* The callback is called before and after the underling operation,
621 * The BIO_CB_RETURN flag indicates if it is after the call */
622 #define BIO_CB_RETURN 0x80
624 /* These are values of the |cmd| argument to |BIO_ctrl|. */
625 #define BIO_CTRL_RESET 1 /* opt - rewind/zero etc */
626 #define BIO_CTRL_EOF 2 /* opt - are we at the eof */
627 #define BIO_CTRL_INFO 3 /* opt - extra tit-bits */
628 #define BIO_CTRL_SET 4 /* man - set the 'IO' type */
629 #define BIO_CTRL_GET 5 /* man - get the 'IO' type */
630 #define BIO_CTRL_PUSH 6 /* opt - internal, used to signify change */
631 #define BIO_CTRL_POP 7 /* opt - internal, used to signify change */
632 #define BIO_CTRL_GET_CLOSE 8 /* man - set the 'close' on free */
633 #define BIO_CTRL_SET_CLOSE 9 /* man - set the 'close' on free */
634 #define BIO_CTRL_PENDING 10 /* opt - is their more data buffered */
635 #define BIO_CTRL_FLUSH 11 /* opt - 'flush' buffered output */
636 #define BIO_CTRL_WPENDING 13 /* opt - number of bytes still to write */
637 /* callback is int cb(BIO *bio,state,ret); */
638 #define BIO_CTRL_SET_CALLBACK 14 /* opt - set callback function */
639 #define BIO_CTRL_GET_CALLBACK 15 /* opt - set callback function */
640 #define BIO_CTRL_SET_FILENAME 30 /* BIO_s_file special */
643 /* Private functions */
645 #define BIO_FLAGS_READ 0x01
646 #define BIO_FLAGS_WRITE 0x02
647 #define BIO_FLAGS_IO_SPECIAL 0x04
648 #define BIO_FLAGS_RWS (BIO_FLAGS_READ | BIO_FLAGS_WRITE | BIO_FLAGS_IO_SPECIAL)
649 #define BIO_FLAGS_SHOULD_RETRY 0x08
650 #define BIO_FLAGS_BASE64_NO_NL 0x100
651 /* This is used with memory BIOs: it means we shouldn't free up or change the
652 * data in any way. */
653 #define BIO_FLAGS_MEM_RDONLY 0x200
655 /* These are the 'types' of BIOs */
656 #define BIO_TYPE_NONE 0
657 #define BIO_TYPE_MEM (1 | 0x0400)
658 #define BIO_TYPE_FILE (2 | 0x0400)
659 #define BIO_TYPE_FD (4 | 0x0400 | 0x0100)
660 #define BIO_TYPE_SOCKET (5 | 0x0400 | 0x0100)
661 #define BIO_TYPE_NULL (6 | 0x0400)
662 #define BIO_TYPE_SSL (7 | 0x0200)
663 #define BIO_TYPE_MD (8 | 0x0200) /* passive filter */
664 #define BIO_TYPE_BUFFER (9 | 0x0200) /* filter */
665 #define BIO_TYPE_CIPHER (10 | 0x0200) /* filter */
666 #define BIO_TYPE_BASE64 (11 | 0x0200) /* filter */
667 #define BIO_TYPE_CONNECT (12 | 0x0400 | 0x0100) /* socket - connect */
668 #define BIO_TYPE_ACCEPT (13 | 0x0400 | 0x0100) /* socket for accept */
669 #define BIO_TYPE_PROXY_CLIENT (14 | 0x0200) /* client proxy BIO */
670 #define BIO_TYPE_PROXY_SERVER (15 | 0x0200) /* server proxy BIO */
671 #define BIO_TYPE_NBIO_TEST (16 | 0x0200) /* server proxy BIO */
672 #define BIO_TYPE_NULL_FILTER (17 | 0x0200)
673 #define BIO_TYPE_BER (18 | 0x0200) /* BER -> bin filter */
674 #define BIO_TYPE_BIO (19 | 0x0400) /* (half a) BIO pair */
675 #define BIO_TYPE_LINEBUFFER (20 | 0x0200) /* filter */
676 #define BIO_TYPE_DGRAM (21 | 0x0400 | 0x0100)
677 #define BIO_TYPE_ASN1 (22 | 0x0200) /* filter */
678 #define BIO_TYPE_COMP (23 | 0x0200) /* filter */
680 #define BIO_TYPE_DESCRIPTOR 0x0100 /* socket, fd, connect or accept */
681 #define BIO_TYPE_FILTER 0x0200
682 #define BIO_TYPE_SOURCE_SINK 0x0400
684 struct bio_method_st {
687 int (*bwrite)(BIO *, const char *, int);
688 int (*bread)(BIO *, char *, int);
689 /* TODO(fork): remove bputs. */
690 int (*bputs)(BIO *, const char *);
691 int (*bgets)(BIO *, char *, int);
692 long (*ctrl)(BIO *, int, long, void *);
693 int (*create)(BIO *);
694 int (*destroy)(BIO *);
695 long (*callback_ctrl)(BIO *, int, bio_info_cb);
699 const BIO_METHOD *method;
700 /* bio, mode, argp, argi, argl, ret */
701 long (*callback)(struct bio_st *, int, const char *, int, long, long);
702 char *cb_arg; /* first argument for the callback */
704 /* init is non-zero if this |BIO| has been initialised. */
706 /* shutdown is often used by specific |BIO_METHOD|s to determine whether
707 * they own some underlying resource. This flag can often by controlled by
708 * |BIO_set_close|. For example, whether an fd BIO closes the underlying fd
709 * when it, itself, is closed. */
713 /* num is a BIO-specific value. For example, in fd BIOs it's used to store a
714 * file descriptor. */
716 /* TODO(fork): reference counting is only used by the SSL BIO code. If we can
717 * dump that then we can remove this. We could also drop
718 * BIO_CTRL_PUSH/BIO_CTRL_POP. */
721 /* next_bio points to the next |BIO| in a chain. This |BIO| owns a reference
723 struct bio_st *next_bio; /* used by filter BIOs */
724 size_t num_read, num_write;
726 CRYPTO_EX_DATA ex_data;
729 #define BIO_C_SET_CONNECT 100
730 #define BIO_C_DO_STATE_MACHINE 101
731 #define BIO_C_SET_NBIO 102
732 #define BIO_C_SET_PROXY_PARAM 103
733 #define BIO_C_SET_FD 104
734 #define BIO_C_GET_FD 105
735 #define BIO_C_SET_FILE_PTR 106
736 #define BIO_C_GET_FILE_PTR 107
737 #define BIO_C_SET_FILENAME 108
738 #define BIO_C_SET_SSL 109
739 #define BIO_C_GET_SSL 110
740 #define BIO_C_SET_MD 111
741 #define BIO_C_GET_MD 112
742 #define BIO_C_GET_CIPHER_STATUS 113
743 #define BIO_C_SET_BUF_MEM 114
744 #define BIO_C_GET_BUF_MEM_PTR 115
745 #define BIO_C_GET_BUFF_NUM_LINES 116
746 #define BIO_C_SET_BUFF_SIZE 117
747 #define BIO_C_SET_ACCEPT 118
748 #define BIO_C_SSL_MODE 119
749 #define BIO_C_GET_MD_CTX 120
750 #define BIO_C_GET_PROXY_PARAM 121
751 #define BIO_C_SET_BUFF_READ_DATA 122 /* data to read first */
752 #define BIO_C_GET_CONNECT 123
753 #define BIO_C_GET_ACCEPT 124
754 #define BIO_C_SET_SSL_RENEGOTIATE_BYTES 125
755 #define BIO_C_GET_SSL_NUM_RENEGOTIATES 126
756 #define BIO_C_SET_SSL_RENEGOTIATE_TIMEOUT 127
757 #define BIO_C_FILE_SEEK 128
758 #define BIO_C_GET_CIPHER_CTX 129
759 #define BIO_C_SET_BUF_MEM_EOF_RETURN 130/*return end of input value*/
760 #define BIO_C_SET_BIND_MODE 131
761 #define BIO_C_GET_BIND_MODE 132
762 #define BIO_C_FILE_TELL 133
763 #define BIO_C_GET_SOCKS 134
764 #define BIO_C_SET_SOCKS 135
766 #define BIO_C_SET_WRITE_BUF_SIZE 136/* for BIO_s_bio */
767 #define BIO_C_GET_WRITE_BUF_SIZE 137
768 #define BIO_C_GET_WRITE_GUARANTEE 140
769 #define BIO_C_GET_READ_REQUEST 141
770 #define BIO_C_SHUTDOWN_WR 142
771 #define BIO_C_NREAD0 143
772 #define BIO_C_NREAD 144
773 #define BIO_C_NWRITE0 145
774 #define BIO_C_NWRITE 146
775 #define BIO_C_RESET_READ_REQUEST 147
776 #define BIO_C_SET_MD_CTX 148
778 #define BIO_C_SET_PREFIX 149
779 #define BIO_C_GET_PREFIX 150
780 #define BIO_C_SET_SUFFIX 151
781 #define BIO_C_GET_SUFFIX 152
783 #define BIO_C_SET_EX_ARG 153
784 #define BIO_C_GET_EX_ARG 154
787 #if defined(__cplusplus)
791 #define BIO_F_bio_make_pair 100
792 #define BIO_F_bio_ctrl 101
793 #define BIO_F_buffer_ctrl 102
794 #define BIO_F_BIO_new_file 103
795 #define BIO_F_file_read 104
796 #define BIO_F_BIO_new 105
797 #define BIO_F_bio_io 106
798 #define BIO_F_BIO_new_mem_buf 107
799 #define BIO_F_mem_write 108
800 #define BIO_F_conn_state 109
801 #define BIO_F_conn_ctrl 110
802 #define BIO_F_file_ctrl 111
803 #define BIO_F_BIO_callback_ctrl 112
804 #define BIO_F_bio_ip_and_port_to_socket_and_addr 113
805 #define BIO_F_bio_write 114
806 #define BIO_F_BIO_ctrl 115
807 #define BIO_R_UNSUPPORTED_METHOD 100
808 #define BIO_R_NO_PORT_SPECIFIED 101
809 #define BIO_R_NO_HOSTNAME_SPECIFIED 102
810 #define BIO_R_IN_USE 103
811 #define BIO_R_UNINITIALIZED 104
812 #define BIO_R_CONNECT_ERROR 105
813 #define BIO_R_KEEPALIVE 106
814 #define BIO_R_BROKEN_PIPE 107
815 #define BIO_R_NBIO_CONNECT_ERROR 108
816 #define BIO_R_BAD_FOPEN_MODE 109
817 #define BIO_R_ASN1_OBJECT_TOO_LONG 110
818 #define BIO_R_INVALID_ARGUMENT 111
819 #define BIO_R_WRITE_TO_READ_ONLY_BIO 112
820 #define BIO_R_ERROR_SETTING_NBIO 113
821 #define BIO_R_SYS_LIB 114
822 #define BIO_R_NO_SUCH_FILE 115
823 #define BIO_R_NULL_PARAMETER 116
824 #define BIO_R_UNABLE_TO_CREATE_SOCKET 117
826 #endif /* OPENSSL_HEADER_BIO_H */