1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 2 * All rights reserved. 3 * 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. 7 * 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). 14 * 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. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 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)" 39 * 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 50 * SUCH DAMAGE. 51 * 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.] */ 56 57 #ifndef OPENSSL_HEADER_BIO_H 58 #define OPENSSL_HEADER_BIO_H 59 60 #include <openssl/base.h> 61 62 #include <stdio.h> // For FILE 63 64 #include <openssl/buffer.h> 65 #include <openssl/err.h> // for ERR_print_errors_fp 66 #include <openssl/ex_data.h> 67 #include <openssl/stack.h> 68 #include <openssl/thread.h> 69 70 #if defined(__cplusplus) 71 extern "C" { 72 #endif 73 74 75 // BIO abstracts over a file-descriptor like interface. 76 77 78 // Allocation and freeing. 79 80 DEFINE_STACK_OF(BIO) 81 82 // BIO_new creates a new BIO with the given method and a reference count of one. 83 // It returns the fresh |BIO|, or NULL on error. 84 OPENSSL_EXPORT BIO *BIO_new(const BIO_METHOD *method); 85 86 // BIO_free decrements the reference count of |bio|. If the reference count 87 // drops to zero, it calls the destroy callback, if present, on the method and 88 // frees |bio| itself. It then repeats that for the next BIO in the chain, if 89 // any. 90 // 91 // It returns one on success or zero otherwise. 92 OPENSSL_EXPORT int BIO_free(BIO *bio); 93 94 // BIO_vfree performs the same actions as |BIO_free|, but has a void return 95 // value. This is provided for API-compat. 96 // 97 // TODO(fork): remove. 98 OPENSSL_EXPORT void BIO_vfree(BIO *bio); 99 100 // BIO_up_ref increments the reference count of |bio| and returns one. 101 OPENSSL_EXPORT int BIO_up_ref(BIO *bio); 102 103 104 // Basic I/O. 105 106 // BIO_read attempts to read |len| bytes into |data|. It returns the number of 107 // bytes read, zero on EOF, or a negative number on error. 108 OPENSSL_EXPORT int BIO_read(BIO *bio, void *data, int len); 109 110 // BIO_gets "reads a line" from |bio| and puts at most |size| bytes into |buf|. 111 // It returns the number of bytes read or a negative number on error. The 112 // phrase "reads a line" is in quotes in the previous sentence because the 113 // exact operation depends on the BIO's method. For example, a digest BIO will 114 // return the digest in response to a |BIO_gets| call. 115 // 116 // TODO(fork): audit the set of BIOs that we end up needing. If all actually 117 // return a line for this call, remove the warning above. 118 OPENSSL_EXPORT int BIO_gets(BIO *bio, char *buf, int size); 119 120 // BIO_write writes |len| bytes from |data| to |bio|. It returns the number of 121 // bytes written or a negative number on error. 122 OPENSSL_EXPORT int BIO_write(BIO *bio, const void *data, int len); 123 124 // BIO_write_all writes |len| bytes from |data| to |bio|, looping as necessary. 125 // It returns one if all bytes were successfully written and zero on error. 126 OPENSSL_EXPORT int BIO_write_all(BIO *bio, const void *data, size_t len); 127 128 // BIO_puts writes a NUL terminated string from |buf| to |bio|. It returns the 129 // number of bytes written or a negative number on error. 130 OPENSSL_EXPORT int BIO_puts(BIO *bio, const char *buf); 131 132 // BIO_flush flushes any buffered output. It returns one on success and zero 133 // otherwise. 134 OPENSSL_EXPORT int BIO_flush(BIO *bio); 135 136 137 // Low-level control functions. 138 // 139 // These are generic functions for sending control requests to a BIO. In 140 // general one should use the wrapper functions like |BIO_get_close|. 141 142 // BIO_ctrl sends the control request |cmd| to |bio|. The |cmd| argument should 143 // be one of the |BIO_C_*| values. 144 OPENSSL_EXPORT long BIO_ctrl(BIO *bio, int cmd, long larg, void *parg); 145 146 // BIO_ptr_ctrl acts like |BIO_ctrl| but passes the address of a |void*| 147 // pointer as |parg| and returns the value that is written to it, or NULL if 148 // the control request returns <= 0. 149 OPENSSL_EXPORT char *BIO_ptr_ctrl(BIO *bp, int cmd, long larg); 150 151 // BIO_int_ctrl acts like |BIO_ctrl| but passes the address of a copy of |iarg| 152 // as |parg|. 153 OPENSSL_EXPORT long BIO_int_ctrl(BIO *bp, int cmd, long larg, int iarg); 154 155 // BIO_reset resets |bio| to its initial state, the precise meaning of which 156 // depends on the concrete type of |bio|. It returns one on success and zero 157 // otherwise. 158 OPENSSL_EXPORT int BIO_reset(BIO *bio); 159 160 // BIO_eof returns non-zero when |bio| has reached end-of-file. The precise 161 // meaning of which depends on the concrete type of |bio|. Note that in the 162 // case of BIO_pair this always returns non-zero. 163 OPENSSL_EXPORT int BIO_eof(BIO *bio); 164 165 // BIO_set_flags ORs |flags| with |bio->flags|. 166 OPENSSL_EXPORT void BIO_set_flags(BIO *bio, int flags); 167 168 // BIO_test_flags returns |bio->flags| AND |flags|. 169 OPENSSL_EXPORT int BIO_test_flags(const BIO *bio, int flags); 170 171 // BIO_should_read returns non-zero if |bio| encountered a temporary error 172 // while reading (i.e. EAGAIN), indicating that the caller should retry the 173 // read. 174 OPENSSL_EXPORT int BIO_should_read(const BIO *bio); 175 176 // BIO_should_write returns non-zero if |bio| encountered a temporary error 177 // while writing (i.e. EAGAIN), indicating that the caller should retry the 178 // write. 179 OPENSSL_EXPORT int BIO_should_write(const BIO *bio); 180 181 // BIO_should_retry returns non-zero if the reason that caused a failed I/O 182 // operation is temporary and thus the operation should be retried. Otherwise, 183 // it was a permanent error and it returns zero. 184 OPENSSL_EXPORT int BIO_should_retry(const BIO *bio); 185 186 // BIO_should_io_special returns non-zero if |bio| encountered a temporary 187 // error while performing a special I/O operation, indicating that the caller 188 // should retry. The operation that caused the error is returned by 189 // |BIO_get_retry_reason|. 190 OPENSSL_EXPORT int BIO_should_io_special(const BIO *bio); 191 192 // BIO_RR_CONNECT indicates that a connect would have blocked 193 #define BIO_RR_CONNECT 0x02 194 195 // BIO_RR_ACCEPT indicates that an accept would have blocked 196 #define BIO_RR_ACCEPT 0x03 197 198 // BIO_get_retry_reason returns the special I/O operation that needs to be 199 // retried. The return value is one of the |BIO_RR_*| values. 200 OPENSSL_EXPORT int BIO_get_retry_reason(const BIO *bio); 201 202 // BIO_set_retry_reason sets the special I/O operation that needs to be retried 203 // to |reason|, which should be one of the |BIO_RR_*| values. 204 OPENSSL_EXPORT void BIO_set_retry_reason(BIO *bio, int reason); 205 206 // BIO_clear_flags ANDs |bio->flags| with the bitwise-complement of |flags|. 207 OPENSSL_EXPORT void BIO_clear_flags(BIO *bio, int flags); 208 209 // BIO_set_retry_read sets the |BIO_FLAGS_READ| and |BIO_FLAGS_SHOULD_RETRY| 210 // flags on |bio|. 211 OPENSSL_EXPORT void BIO_set_retry_read(BIO *bio); 212 213 // BIO_set_retry_write sets the |BIO_FLAGS_WRITE| and |BIO_FLAGS_SHOULD_RETRY| 214 // flags on |bio|. 215 OPENSSL_EXPORT void BIO_set_retry_write(BIO *bio); 216 217 // BIO_get_retry_flags gets the |BIO_FLAGS_READ|, |BIO_FLAGS_WRITE|, 218 // |BIO_FLAGS_IO_SPECIAL| and |BIO_FLAGS_SHOULD_RETRY| flags from |bio|. 219 OPENSSL_EXPORT int BIO_get_retry_flags(BIO *bio); 220 221 // BIO_clear_retry_flags clears the |BIO_FLAGS_READ|, |BIO_FLAGS_WRITE|, 222 // |BIO_FLAGS_IO_SPECIAL| and |BIO_FLAGS_SHOULD_RETRY| flags from |bio|. 223 OPENSSL_EXPORT void BIO_clear_retry_flags(BIO *bio); 224 225 // BIO_method_type returns the type of |bio|, which is one of the |BIO_TYPE_*| 226 // values. 227 OPENSSL_EXPORT int BIO_method_type(const BIO *bio); 228 229 // These are passed to the BIO callback 230 #define BIO_CB_FREE 0x01 231 #define BIO_CB_READ 0x02 232 #define BIO_CB_WRITE 0x03 233 #define BIO_CB_PUTS 0x04 234 #define BIO_CB_GETS 0x05 235 #define BIO_CB_CTRL 0x06 236 237 // The callback is called before and after the underling operation, 238 // The BIO_CB_RETURN flag indicates if it is after the call 239 #define BIO_CB_RETURN 0x80 240 241 // bio_info_cb is the type of a callback function that can be called for most 242 // BIO operations. The |event| argument is one of |BIO_CB_*| and can be ORed 243 // with |BIO_CB_RETURN| if the callback is being made after the operation in 244 // question. In that case, |return_value| will contain the return value from 245 // the operation. 246 typedef long (*bio_info_cb)(BIO *bio, int event, const char *parg, int cmd, 247 long larg, long return_value); 248 249 // BIO_callback_ctrl allows the callback function to be manipulated. The |cmd| 250 // arg will generally be |BIO_CTRL_SET_CALLBACK| but arbitrary command values 251 // can be interpreted by the |BIO|. 252 OPENSSL_EXPORT long BIO_callback_ctrl(BIO *bio, int cmd, bio_info_cb fp); 253 254 // BIO_pending returns the number of bytes pending to be read. 255 OPENSSL_EXPORT size_t BIO_pending(const BIO *bio); 256 257 // BIO_ctrl_pending calls |BIO_pending| and exists only for compatibility with 258 // OpenSSL. 259 OPENSSL_EXPORT size_t BIO_ctrl_pending(const BIO *bio); 260 261 // BIO_wpending returns the number of bytes pending to be written. 262 OPENSSL_EXPORT size_t BIO_wpending(const BIO *bio); 263 264 // BIO_set_close sets the close flag for |bio|. The meaning of which depends on 265 // the type of |bio| but, for example, a memory BIO interprets the close flag 266 // as meaning that it owns its buffer. It returns one on success and zero 267 // otherwise. 268 OPENSSL_EXPORT int BIO_set_close(BIO *bio, int close_flag); 269 270 // BIO_number_read returns the number of bytes that have been read from 271 // |bio|. 272 OPENSSL_EXPORT size_t BIO_number_read(const BIO *bio); 273 274 // BIO_number_written returns the number of bytes that have been written to 275 // |bio|. 276 OPENSSL_EXPORT size_t BIO_number_written(const BIO *bio); 277 278 279 // Managing chains of BIOs. 280 // 281 // BIOs can be put into chains where the output of one is used as the input of 282 // the next etc. The most common case is a buffering BIO, which accepts and 283 // buffers writes until flushed into the next BIO in the chain. 284 285 // BIO_push adds |appended_bio| to the end of the chain with |bio| at the head. 286 // It returns |bio|. Note that |appended_bio| may be the head of a chain itself 287 // and thus this function can be used to join two chains. 288 // 289 // BIO_push takes ownership of the caller's reference to |appended_bio|. 290 OPENSSL_EXPORT BIO *BIO_push(BIO *bio, BIO *appended_bio); 291 292 // BIO_pop removes |bio| from the head of a chain and returns the next BIO in 293 // the chain, or NULL if there is no next BIO. 294 // 295 // The caller takes ownership of the chain's reference to |bio|. 296 OPENSSL_EXPORT BIO *BIO_pop(BIO *bio); 297 298 // BIO_next returns the next BIO in the chain after |bio|, or NULL if there is 299 // no such BIO. 300 OPENSSL_EXPORT BIO *BIO_next(BIO *bio); 301 302 // BIO_free_all calls |BIO_free|. 303 // 304 // TODO(fork): update callers and remove. 305 OPENSSL_EXPORT void BIO_free_all(BIO *bio); 306 307 // BIO_find_type walks a chain of BIOs and returns the first that matches 308 // |type|, which is one of the |BIO_TYPE_*| values. 309 OPENSSL_EXPORT BIO *BIO_find_type(BIO *bio, int type); 310 311 // BIO_copy_next_retry sets the retry flags and |retry_reason| of |bio| from 312 // the next BIO in the chain. 313 OPENSSL_EXPORT void BIO_copy_next_retry(BIO *bio); 314 315 316 // Printf functions. 317 318 // BIO_printf behaves like |printf| but outputs to |bio| rather than a |FILE|. 319 // It returns the number of bytes written or a negative number on error. 320 OPENSSL_EXPORT int BIO_printf(BIO *bio, const char *format, ...) 321 OPENSSL_PRINTF_FORMAT_FUNC(2, 3); 322 323 324 // Utility functions. 325 326 // BIO_indent prints min(|indent|, |max_indent|) spaces. It returns one on 327 // success and zero otherwise. 328 OPENSSL_EXPORT int BIO_indent(BIO *bio, unsigned indent, unsigned max_indent); 329 330 // BIO_hexdump writes a hex dump of |data| to |bio|. Each line will be indented 331 // by |indent| spaces. 332 OPENSSL_EXPORT int BIO_hexdump(BIO *bio, const uint8_t *data, size_t len, 333 unsigned indent); 334 335 // ERR_print_errors prints the current contents of the error stack to |bio| 336 // using human readable strings where possible. 337 OPENSSL_EXPORT void ERR_print_errors(BIO *bio); 338 339 // BIO_read_asn1 reads a single ASN.1 object from |bio|. If successful it sets 340 // |*out| to be an allocated buffer (that should be freed with |OPENSSL_free|), 341 // |*out_size| to the length, in bytes, of that buffer and returns one. 342 // Otherwise it returns zero. 343 // 344 // If the length of the object is greater than |max_len| or 2^32 then the 345 // function will fail. Long-form tags are not supported. If the length of the 346 // object is indefinite the full contents of |bio| are read, unless it would be 347 // greater than |max_len|, in which case the function fails. 348 // 349 // If the function fails then some unknown amount of data may have been read 350 // from |bio|. 351 OPENSSL_EXPORT int BIO_read_asn1(BIO *bio, uint8_t **out, size_t *out_len, 352 size_t max_len); 353 354 355 // Memory BIOs. 356 // 357 // Memory BIOs can be used as a read-only source (with |BIO_new_mem_buf|) or a 358 // writable sink (with |BIO_new|, |BIO_s_mem| and |BIO_mem_contents|). Data 359 // written to a writable, memory BIO can be recalled by reading from it. 360 // 361 // Calling |BIO_reset| on a read-only BIO resets it to the original contents. 362 // On a writable BIO, it clears any data. 363 // 364 // If the close flag is set to |BIO_NOCLOSE| (not the default) then the 365 // underlying |BUF_MEM| will not be freed when the |BIO| is freed. 366 // 367 // Memory BIOs support |BIO_gets| and |BIO_puts|. 368 // 369 // |BIO_ctrl_pending| returns the number of bytes currently stored. 370 371 // BIO_NOCLOSE and |BIO_CLOSE| can be used as symbolic arguments when a "close 372 // flag" is passed to a BIO function. 373 #define BIO_NOCLOSE 0 374 #define BIO_CLOSE 1 375 376 // BIO_s_mem returns a |BIO_METHOD| that uses a in-memory buffer. 377 OPENSSL_EXPORT const BIO_METHOD *BIO_s_mem(void); 378 379 // BIO_new_mem_buf creates read-only BIO that reads from |len| bytes at |buf|. 380 // It does not take ownership of |buf|. It returns the BIO or NULL on error. 381 // 382 // If |len| is negative, then |buf| is treated as a NUL-terminated string, but 383 // don't depend on this in new code. 384 OPENSSL_EXPORT BIO *BIO_new_mem_buf(const void *buf, int len); 385 386 // BIO_mem_contents sets |*out_contents| to point to the current contents of 387 // |bio| and |*out_len| to contain the length of that data. It returns one on 388 // success and zero otherwise. 389 OPENSSL_EXPORT int BIO_mem_contents(const BIO *bio, 390 const uint8_t **out_contents, 391 size_t *out_len); 392 393 // BIO_get_mem_data sets |*contents| to point to the current contents of |bio| 394 // and returns the length of the data. 395 // 396 // WARNING: don't use this, use |BIO_mem_contents|. A return value of zero from 397 // this function can mean either that it failed or that the memory buffer is 398 // empty. 399 OPENSSL_EXPORT long BIO_get_mem_data(BIO *bio, char **contents); 400 401 // BIO_get_mem_ptr sets |*out| to a BUF_MEM containing the current contents of 402 // |bio|. It returns one on success or zero on error. 403 OPENSSL_EXPORT int BIO_get_mem_ptr(BIO *bio, BUF_MEM **out); 404 405 // BIO_set_mem_buf sets |b| as the contents of |bio|. If |take_ownership| is 406 // non-zero, then |b| will be freed when |bio| is closed. Returns one on 407 // success or zero otherwise. 408 OPENSSL_EXPORT int BIO_set_mem_buf(BIO *bio, BUF_MEM *b, int take_ownership); 409 410 // BIO_set_mem_eof_return sets the value that will be returned from reading 411 // |bio| when empty. If |eof_value| is zero then an empty memory BIO will 412 // return EOF (that is it will return zero and |BIO_should_retry| will be 413 // false). If |eof_value| is non zero then it will return |eof_value| when it 414 // is empty and it will set the read retry flag (that is |BIO_read_retry| is 415 // true). To avoid ambiguity with a normal positive return value, |eof_value| 416 // should be set to a negative value, typically -1. 417 // 418 // For a read-only BIO, the default is zero (EOF). For a writable BIO, the 419 // default is -1 so that additional data can be written once exhausted. 420 OPENSSL_EXPORT int BIO_set_mem_eof_return(BIO *bio, int eof_value); 421 422 423 // File descriptor BIOs. 424 // 425 // File descriptor BIOs are wrappers around the system's |read| and |write| 426 // functions. If the close flag is set then then |close| is called on the 427 // underlying file descriptor when the BIO is freed. 428 // 429 // |BIO_reset| attempts to seek the file pointer to the start of file using 430 // |lseek|. 431 432 // BIO_s_fd returns a |BIO_METHOD| for file descriptor fds. 433 OPENSSL_EXPORT const BIO_METHOD *BIO_s_fd(void); 434 435 // BIO_new_fd creates a new file descriptor BIO wrapping |fd|. If |close_flag| 436 // is non-zero, then |fd| will be closed when the BIO is. 437 OPENSSL_EXPORT BIO *BIO_new_fd(int fd, int close_flag); 438 439 // BIO_set_fd sets the file descriptor of |bio| to |fd|. If |close_flag| is 440 // non-zero then |fd| will be closed when |bio| is. It returns one on success 441 // or zero on error. 442 // 443 // This function may also be used with socket BIOs (see |BIO_s_socket| and 444 // |BIO_new_socket|). 445 OPENSSL_EXPORT int BIO_set_fd(BIO *bio, int fd, int close_flag); 446 447 // BIO_get_fd returns the file descriptor currently in use by |bio| or -1 if 448 // |bio| does not wrap a file descriptor. If there is a file descriptor and 449 // |out_fd| is not NULL, it also sets |*out_fd| to the file descriptor. 450 // 451 // This function may also be used with socket BIOs (see |BIO_s_socket| and 452 // |BIO_new_socket|). 453 OPENSSL_EXPORT int BIO_get_fd(BIO *bio, int *out_fd); 454 455 456 // File BIOs. 457 // 458 // File BIOs are wrappers around a C |FILE| object. 459 // 460 // |BIO_flush| on a file BIO calls |fflush| on the wrapped stream. 461 // 462 // |BIO_reset| attempts to seek the file pointer to the start of file using 463 // |fseek|. 464 // 465 // Setting the close flag causes |fclose| to be called on the stream when the 466 // BIO is freed. 467 468 // BIO_s_file returns a BIO_METHOD that wraps a |FILE|. 469 OPENSSL_EXPORT const BIO_METHOD *BIO_s_file(void); 470 471 // BIO_new_file creates a file BIO by opening |filename| with the given mode. 472 // See the |fopen| manual page for details of the mode argument. 473 OPENSSL_EXPORT BIO *BIO_new_file(const char *filename, const char *mode); 474 475 // BIO_new_fp creates a new file BIO that wraps the given |FILE|. If 476 // |close_flag| is |BIO_CLOSE|, then |fclose| will be called on |stream| when 477 // the BIO is closed. 478 OPENSSL_EXPORT BIO *BIO_new_fp(FILE *stream, int close_flag); 479 480 // BIO_get_fp sets |*out_file| to the current |FILE| for |bio|. It returns one 481 // on success and zero otherwise. 482 OPENSSL_EXPORT int BIO_get_fp(BIO *bio, FILE **out_file); 483 484 // BIO_set_fp sets the |FILE| for |bio|. If |close_flag| is |BIO_CLOSE| then 485 // |fclose| will be called on |file| when |bio| is closed. It returns one on 486 // success and zero otherwise. 487 OPENSSL_EXPORT int BIO_set_fp(BIO *bio, FILE *file, int close_flag); 488 489 // BIO_read_filename opens |filename| for reading and sets the result as the 490 // |FILE| for |bio|. It returns one on success and zero otherwise. The |FILE| 491 // will be closed when |bio| is freed. 492 OPENSSL_EXPORT int BIO_read_filename(BIO *bio, const char *filename); 493 494 // BIO_write_filename opens |filename| for writing and sets the result as the 495 // |FILE| for |bio|. It returns one on success and zero otherwise. The |FILE| 496 // will be closed when |bio| is freed. 497 OPENSSL_EXPORT int BIO_write_filename(BIO *bio, const char *filename); 498 499 // BIO_append_filename opens |filename| for appending and sets the result as 500 // the |FILE| for |bio|. It returns one on success and zero otherwise. The 501 // |FILE| will be closed when |bio| is freed. 502 OPENSSL_EXPORT int BIO_append_filename(BIO *bio, const char *filename); 503 504 // BIO_rw_filename opens |filename| for reading and writing and sets the result 505 // as the |FILE| for |bio|. It returns one on success and zero otherwise. The 506 // |FILE| will be closed when |bio| is freed. 507 OPENSSL_EXPORT int BIO_rw_filename(BIO *bio, const char *filename); 508 509 510 // Socket BIOs. 511 // 512 // Socket BIOs behave like file descriptor BIOs but, on Windows systems, wrap 513 // the system's |recv| and |send| functions instead of |read| and |write|. On 514 // Windows, file descriptors are provided by C runtime and are not 515 // interchangeable with sockets. 516 // 517 // Socket BIOs may be used with |BIO_set_fd| and |BIO_get_fd|. 518 // 519 // TODO(davidben): Add separate APIs and fix the internals to use |SOCKET|s 520 // around rather than rely on int casts. 521 522 OPENSSL_EXPORT const BIO_METHOD *BIO_s_socket(void); 523 524 // BIO_new_socket allocates and initialises a fresh BIO which will read and 525 // write to the socket |fd|. If |close_flag| is |BIO_CLOSE| then closing the 526 // BIO will close |fd|. It returns the fresh |BIO| or NULL on error. 527 OPENSSL_EXPORT BIO *BIO_new_socket(int fd, int close_flag); 528 529 530 // Connect BIOs. 531 // 532 // A connection BIO creates a network connection and transfers data over the 533 // resulting socket. 534 535 OPENSSL_EXPORT const BIO_METHOD *BIO_s_connect(void); 536 537 // BIO_new_connect returns a BIO that connects to the given hostname and port. 538 // The |host_and_optional_port| argument should be of the form 539 // "www.example.com" or "www.example.com:443". If the port is omitted, it must 540 // be provided with |BIO_set_conn_port|. 541 // 542 // It returns the new BIO on success, or NULL on error. 543 OPENSSL_EXPORT BIO *BIO_new_connect(const char *host_and_optional_port); 544 545 // BIO_set_conn_hostname sets |host_and_optional_port| as the hostname and 546 // optional port that |bio| will connect to. If the port is omitted, it must be 547 // provided with |BIO_set_conn_port|. 548 // 549 // It returns one on success and zero otherwise. 550 OPENSSL_EXPORT int BIO_set_conn_hostname(BIO *bio, 551 const char *host_and_optional_port); 552 553 // BIO_set_conn_port sets |port_str| as the port or service name that |bio| 554 // will connect to. It returns one on success and zero otherwise. 555 OPENSSL_EXPORT int BIO_set_conn_port(BIO *bio, const char *port_str); 556 557 // BIO_set_conn_int_port sets |*port| as the port that |bio| will connect to. 558 // It returns one on success and zero otherwise. 559 OPENSSL_EXPORT int BIO_set_conn_int_port(BIO *bio, const int *port); 560 561 // BIO_set_nbio sets whether |bio| will use non-blocking I/O operations. It 562 // returns one on success and zero otherwise. 563 OPENSSL_EXPORT int BIO_set_nbio(BIO *bio, int on); 564 565 // BIO_do_connect connects |bio| if it has not been connected yet. It returns 566 // one on success and <= 0 otherwise. 567 OPENSSL_EXPORT int BIO_do_connect(BIO *bio); 568 569 570 // Datagram BIOs. 571 // 572 // TODO(fork): not implemented. 573 574 #define BIO_CTRL_DGRAM_QUERY_MTU 40 // as kernel for current MTU 575 576 #define BIO_CTRL_DGRAM_SET_MTU 42 /* set cached value for MTU. want to use 577 this if asking the kernel fails */ 578 579 #define BIO_CTRL_DGRAM_MTU_EXCEEDED 43 /* check whether the MTU was exceed in 580 the previous write operation. */ 581 582 // BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT is unsupported as it is unused by consumers 583 // and depends on |timeval|, which is not 2038-clean on all platforms. 584 585 #define BIO_CTRL_DGRAM_GET_PEER 46 586 587 #define BIO_CTRL_DGRAM_GET_FALLBACK_MTU 47 588 589 590 // BIO Pairs. 591 // 592 // BIO pairs provide a "loopback" like system: a pair of BIOs where data 593 // written to one can be read from the other and vice versa. 594 595 // BIO_new_bio_pair sets |*out1| and |*out2| to two freshly created BIOs where 596 // data written to one can be read from the other and vice versa. The 597 // |writebuf1| argument gives the size of the buffer used in |*out1| and 598 // |writebuf2| for |*out2|. It returns one on success and zero on error. 599 OPENSSL_EXPORT int BIO_new_bio_pair(BIO **out1, size_t writebuf1, BIO **out2, 600 size_t writebuf2); 601 602 // BIO_ctrl_get_read_request returns the number of bytes that the other side of 603 // |bio| tried (unsuccessfully) to read. 604 OPENSSL_EXPORT size_t BIO_ctrl_get_read_request(BIO *bio); 605 606 // BIO_ctrl_get_write_guarantee returns the number of bytes that |bio| (which 607 // must have been returned by |BIO_new_bio_pair|) will accept on the next 608 // |BIO_write| call. 609 OPENSSL_EXPORT size_t BIO_ctrl_get_write_guarantee(BIO *bio); 610 611 // BIO_shutdown_wr marks |bio| as closed, from the point of view of the other 612 // side of the pair. Future |BIO_write| calls on |bio| will fail. It returns 613 // one on success and zero otherwise. 614 OPENSSL_EXPORT int BIO_shutdown_wr(BIO *bio); 615 616 617 // Custom BIOs. 618 // 619 // Consumers can create custom |BIO|s by filling in a |BIO_METHOD| and using 620 // low-level control functions to set state. 621 622 // BIO_get_new_index returns a new "type" value for a custom |BIO|. 623 OPENSSL_EXPORT int BIO_get_new_index(void); 624 625 // BIO_meth_new returns a newly-allocated |BIO_METHOD| or NULL on allocation 626 // error. The |type| specifies the type that will be returned by 627 // |BIO_method_type|. If this is unnecessary, this value may be zero. The |name| 628 // parameter is vestigial and may be NULL. 629 // 630 // Use the |BIO_meth_set_*| functions below to initialize the |BIO_METHOD|. The 631 // function implementations may use |BIO_set_data| and |BIO_get_data| to add 632 // method-specific state to associated |BIO|s. Additionally, |BIO_set_init| must 633 // be called after an associated |BIO| is fully initialized. State set via 634 // |BIO_set_data| may be released by configuring a destructor with 635 // |BIO_meth_set_destroy|. 636 OPENSSL_EXPORT BIO_METHOD *BIO_meth_new(int type, const char *name); 637 638 // BIO_meth_free releases memory associated with |method|. 639 OPENSSL_EXPORT void BIO_meth_free(BIO_METHOD *method); 640 641 // BIO_meth_set_create sets a function to be called on |BIO_new| for |method| 642 // and returns one. The function should return one on success and zero on 643 // error. 644 OPENSSL_EXPORT int BIO_meth_set_create(BIO_METHOD *method, 645 int (*create)(BIO *)); 646 647 // BIO_meth_set_destroy sets a function to release data associated with a |BIO| 648 // and returns one. The function's return value is ignored. 649 OPENSSL_EXPORT int BIO_meth_set_destroy(BIO_METHOD *method, 650 int (*destroy)(BIO *)); 651 652 // BIO_meth_set_write sets the implementation of |BIO_write| for |method| and 653 // returns one. |BIO_METHOD|s which implement |BIO_write| should also implement 654 // |BIO_CTRL_FLUSH|. (See |BIO_meth_set_ctrl|.) 655 OPENSSL_EXPORT int BIO_meth_set_write(BIO_METHOD *method, 656 int (*write)(BIO *, const char *, int)); 657 658 // BIO_meth_set_read sets the implementation of |BIO_read| for |method| and 659 // returns one. 660 OPENSSL_EXPORT int BIO_meth_set_read(BIO_METHOD *method, 661 int (*read)(BIO *, char *, int)); 662 663 // BIO_meth_set_gets sets the implementation of |BIO_gets| for |method| and 664 // returns one. 665 OPENSSL_EXPORT int BIO_meth_set_gets(BIO_METHOD *method, 666 int (*gets)(BIO *, char *, int)); 667 668 // BIO_meth_set_ctrl sets the implementation of |BIO_ctrl| for |method| and 669 // returns one. 670 OPENSSL_EXPORT int BIO_meth_set_ctrl(BIO_METHOD *method, 671 long (*ctrl)(BIO *, int, long, void *)); 672 673 // BIO_set_data sets custom data on |bio|. It may be retried with 674 // |BIO_get_data|. 675 OPENSSL_EXPORT void BIO_set_data(BIO *bio, void *ptr); 676 677 // BIO_get_data returns custom data on |bio| set by |BIO_get_data|. 678 OPENSSL_EXPORT void *BIO_get_data(BIO *bio); 679 680 // BIO_set_init sets whether |bio| has been fully initialized. Until fully 681 // initialized, |BIO_read| and |BIO_write| will fail. 682 OPENSSL_EXPORT void BIO_set_init(BIO *bio, int init); 683 684 // BIO_get_init returns whether |bio| has been fully initialized. 685 OPENSSL_EXPORT int BIO_get_init(BIO *bio); 686 687 // These are values of the |cmd| argument to |BIO_ctrl|. 688 689 // BIO_CTRL_RESET implements |BIO_reset|. The arguments are unused. 690 #define BIO_CTRL_RESET 1 691 692 // BIO_CTRL_EOF implements |BIO_eof|. The arguments are unused. 693 #define BIO_CTRL_EOF 2 694 695 // BIO_CTRL_INFO is a legacy command that returns information specific to the 696 // type of |BIO|. It is not safe to call generically and should not be 697 // implemented in new |BIO| types. 698 #define BIO_CTRL_INFO 3 699 700 // BIO_CTRL_GET_CLOSE returns the close flag set by |BIO_CTRL_SET_CLOSE|. The 701 // arguments are unused. 702 #define BIO_CTRL_GET_CLOSE 8 703 704 // BIO_CTRL_SET_CLOSE implements |BIO_set_close|. The |larg| argument is the 705 // close flag. 706 #define BIO_CTRL_SET_CLOSE 9 707 708 // BIO_CTRL_PENDING implements |BIO_pending|. The arguments are unused. 709 #define BIO_CTRL_PENDING 10 710 711 // BIO_CTRL_FLUSH implements |BIO_flush|. The arguments are unused. 712 #define BIO_CTRL_FLUSH 11 713 714 // BIO_CTRL_WPENDING implements |BIO_wpending|. The arguments are unused. 715 #define BIO_CTRL_WPENDING 13 716 717 // BIO_CTRL_SET_CALLBACK sets an informational callback of type 718 // int cb(BIO *bio, int state, int ret) 719 #define BIO_CTRL_SET_CALLBACK 14 720 721 // BIO_CTRL_GET_CALLBACK returns the callback set by |BIO_CTRL_SET_CALLBACK|. 722 #define BIO_CTRL_GET_CALLBACK 15 723 724 // The following are never used, but are defined to aid porting existing code. 725 #define BIO_CTRL_SET 4 726 #define BIO_CTRL_GET 5 727 #define BIO_CTRL_PUSH 6 728 #define BIO_CTRL_POP 7 729 #define BIO_CTRL_DUP 12 730 #define BIO_CTRL_SET_FILENAME 30 731 732 733 // Deprecated functions. 734 735 // BIO_f_base64 returns a filter |BIO| that base64-encodes data written into 736 // it, and decodes data read from it. |BIO_gets| is not supported. Call 737 // |BIO_flush| when done writing, to signal that no more data are to be 738 // encoded. The flag |BIO_FLAGS_BASE64_NO_NL| may be set to encode all the data 739 // on one line. 740 // 741 // Use |EVP_EncodeBlock| and |EVP_DecodeBase64| instead. 742 OPENSSL_EXPORT const BIO_METHOD *BIO_f_base64(void); 743 744 OPENSSL_EXPORT void BIO_set_retry_special(BIO *bio); 745 746 // BIO_set_write_buffer_size returns zero. 747 OPENSSL_EXPORT int BIO_set_write_buffer_size(BIO *bio, int buffer_size); 748 749 // BIO_set_shutdown sets a method-specific "shutdown" bit on |bio|. 750 OPENSSL_EXPORT void BIO_set_shutdown(BIO *bio, int shutdown); 751 752 // BIO_get_shutdown returns the method-specific "shutdown" bit. 753 OPENSSL_EXPORT int BIO_get_shutdown(BIO *bio); 754 755 // BIO_meth_set_puts returns one. |BIO_puts| is implemented with |BIO_write| in 756 // BoringSSL. 757 OPENSSL_EXPORT int BIO_meth_set_puts(BIO_METHOD *method, 758 int (*puts)(BIO *, const char *)); 759 760 761 // Private functions 762 763 #define BIO_FLAGS_READ 0x01 764 #define BIO_FLAGS_WRITE 0x02 765 #define BIO_FLAGS_IO_SPECIAL 0x04 766 #define BIO_FLAGS_RWS (BIO_FLAGS_READ | BIO_FLAGS_WRITE | BIO_FLAGS_IO_SPECIAL) 767 #define BIO_FLAGS_SHOULD_RETRY 0x08 768 #define BIO_FLAGS_BASE64_NO_NL 0x100 769 // BIO_FLAGS_MEM_RDONLY is used with memory BIOs. It means we shouldn't free up 770 // or change the data in any way. 771 #define BIO_FLAGS_MEM_RDONLY 0x200 772 773 // These are the 'types' of BIOs 774 #define BIO_TYPE_NONE 0 775 #define BIO_TYPE_MEM (1 | 0x0400) 776 #define BIO_TYPE_FILE (2 | 0x0400) 777 #define BIO_TYPE_FD (4 | 0x0400 | 0x0100) 778 #define BIO_TYPE_SOCKET (5 | 0x0400 | 0x0100) 779 #define BIO_TYPE_NULL (6 | 0x0400) 780 #define BIO_TYPE_SSL (7 | 0x0200) 781 #define BIO_TYPE_MD (8 | 0x0200) // passive filter 782 #define BIO_TYPE_BUFFER (9 | 0x0200) // filter 783 #define BIO_TYPE_CIPHER (10 | 0x0200) // filter 784 #define BIO_TYPE_BASE64 (11 | 0x0200) // filter 785 #define BIO_TYPE_CONNECT (12 | 0x0400 | 0x0100) // socket - connect 786 #define BIO_TYPE_ACCEPT (13 | 0x0400 | 0x0100) // socket for accept 787 #define BIO_TYPE_PROXY_CLIENT (14 | 0x0200) // client proxy BIO 788 #define BIO_TYPE_PROXY_SERVER (15 | 0x0200) // server proxy BIO 789 #define BIO_TYPE_NBIO_TEST (16 | 0x0200) // server proxy BIO 790 #define BIO_TYPE_NULL_FILTER (17 | 0x0200) 791 #define BIO_TYPE_BER (18 | 0x0200) // BER -> bin filter 792 #define BIO_TYPE_BIO (19 | 0x0400) // (half a) BIO pair 793 #define BIO_TYPE_LINEBUFFER (20 | 0x0200) // filter 794 #define BIO_TYPE_DGRAM (21 | 0x0400 | 0x0100) 795 #define BIO_TYPE_ASN1 (22 | 0x0200) // filter 796 #define BIO_TYPE_COMP (23 | 0x0200) // filter 797 798 // BIO_TYPE_DESCRIPTOR denotes that the |BIO| responds to the |BIO_C_SET_FD| 799 // (|BIO_set_fd|) and |BIO_C_GET_FD| (|BIO_get_fd|) control hooks. 800 #define BIO_TYPE_DESCRIPTOR 0x0100 // socket, fd, connect or accept 801 #define BIO_TYPE_FILTER 0x0200 802 #define BIO_TYPE_SOURCE_SINK 0x0400 803 804 // BIO_TYPE_START is the first user-allocated |BIO| type. No pre-defined type, 805 // flag bits aside, may exceed this value. 806 #define BIO_TYPE_START 128 807 808 struct bio_method_st { 809 int type; 810 const char *name; 811 int (*bwrite)(BIO *, const char *, int); 812 int (*bread)(BIO *, char *, int); 813 // TODO(fork): remove bputs. 814 int (*bputs)(BIO *, const char *); 815 int (*bgets)(BIO *, char *, int); 816 long (*ctrl)(BIO *, int, long, void *); 817 int (*create)(BIO *); 818 int (*destroy)(BIO *); 819 long (*callback_ctrl)(BIO *, int, bio_info_cb); 820 }; 821 822 struct bio_st { 823 const BIO_METHOD *method; 824 825 // init is non-zero if this |BIO| has been initialised. 826 int init; 827 // shutdown is often used by specific |BIO_METHOD|s to determine whether 828 // they own some underlying resource. This flag can often by controlled by 829 // |BIO_set_close|. For example, whether an fd BIO closes the underlying fd 830 // when it, itself, is closed. 831 int shutdown; 832 int flags; 833 int retry_reason; 834 // num is a BIO-specific value. For example, in fd BIOs it's used to store a 835 // file descriptor. 836 int num; 837 CRYPTO_refcount_t references; 838 void *ptr; 839 // next_bio points to the next |BIO| in a chain. This |BIO| owns a reference 840 // to |next_bio|. 841 BIO *next_bio; // used by filter BIOs 842 size_t num_read, num_write; 843 }; 844 845 #define BIO_C_SET_CONNECT 100 846 #define BIO_C_DO_STATE_MACHINE 101 847 #define BIO_C_SET_NBIO 102 848 #define BIO_C_SET_PROXY_PARAM 103 849 #define BIO_C_SET_FD 104 850 #define BIO_C_GET_FD 105 851 #define BIO_C_SET_FILE_PTR 106 852 #define BIO_C_GET_FILE_PTR 107 853 #define BIO_C_SET_FILENAME 108 854 #define BIO_C_SET_SSL 109 855 #define BIO_C_GET_SSL 110 856 #define BIO_C_SET_MD 111 857 #define BIO_C_GET_MD 112 858 #define BIO_C_GET_CIPHER_STATUS 113 859 #define BIO_C_SET_BUF_MEM 114 860 #define BIO_C_GET_BUF_MEM_PTR 115 861 #define BIO_C_GET_BUFF_NUM_LINES 116 862 #define BIO_C_SET_BUFF_SIZE 117 863 #define BIO_C_SET_ACCEPT 118 864 #define BIO_C_SSL_MODE 119 865 #define BIO_C_GET_MD_CTX 120 866 #define BIO_C_GET_PROXY_PARAM 121 867 #define BIO_C_SET_BUFF_READ_DATA 122 // data to read first 868 #define BIO_C_GET_ACCEPT 124 869 #define BIO_C_SET_SSL_RENEGOTIATE_BYTES 125 870 #define BIO_C_GET_SSL_NUM_RENEGOTIATES 126 871 #define BIO_C_SET_SSL_RENEGOTIATE_TIMEOUT 127 872 #define BIO_C_FILE_SEEK 128 873 #define BIO_C_GET_CIPHER_CTX 129 874 #define BIO_C_SET_BUF_MEM_EOF_RETURN 130 // return end of input value 875 #define BIO_C_SET_BIND_MODE 131 876 #define BIO_C_GET_BIND_MODE 132 877 #define BIO_C_FILE_TELL 133 878 #define BIO_C_GET_SOCKS 134 879 #define BIO_C_SET_SOCKS 135 880 881 #define BIO_C_SET_WRITE_BUF_SIZE 136 // for BIO_s_bio 882 #define BIO_C_GET_WRITE_BUF_SIZE 137 883 #define BIO_C_GET_WRITE_GUARANTEE 140 884 #define BIO_C_GET_READ_REQUEST 141 885 #define BIO_C_SHUTDOWN_WR 142 886 #define BIO_C_NREAD0 143 887 #define BIO_C_NREAD 144 888 #define BIO_C_NWRITE0 145 889 #define BIO_C_NWRITE 146 890 #define BIO_C_RESET_READ_REQUEST 147 891 #define BIO_C_SET_MD_CTX 148 892 893 #define BIO_C_SET_PREFIX 149 894 #define BIO_C_GET_PREFIX 150 895 #define BIO_C_SET_SUFFIX 151 896 #define BIO_C_GET_SUFFIX 152 897 898 #define BIO_C_SET_EX_ARG 153 899 #define BIO_C_GET_EX_ARG 154 900 901 902 #if defined(__cplusplus) 903 } // extern C 904 905 extern "C++" { 906 907 BSSL_NAMESPACE_BEGIN 908 909 BORINGSSL_MAKE_DELETER(BIO, BIO_free) 910 BORINGSSL_MAKE_UP_REF(BIO, BIO_up_ref) 911 BORINGSSL_MAKE_DELETER(BIO_METHOD, BIO_meth_free) 912 913 BSSL_NAMESPACE_END 914 915 } // extern C++ 916 917 #endif 918 919 #define BIO_R_BAD_FOPEN_MODE 100 920 #define BIO_R_BROKEN_PIPE 101 921 #define BIO_R_CONNECT_ERROR 102 922 #define BIO_R_ERROR_SETTING_NBIO 103 923 #define BIO_R_INVALID_ARGUMENT 104 924 #define BIO_R_IN_USE 105 925 #define BIO_R_KEEPALIVE 106 926 #define BIO_R_NBIO_CONNECT_ERROR 107 927 #define BIO_R_NO_HOSTNAME_SPECIFIED 108 928 #define BIO_R_NO_PORT_SPECIFIED 109 929 #define BIO_R_NO_SUCH_FILE 110 930 #define BIO_R_NULL_PARAMETER 111 931 #define BIO_R_SYS_LIB 112 932 #define BIO_R_UNABLE_TO_CREATE_SOCKET 113 933 #define BIO_R_UNINITIALIZED 114 934 #define BIO_R_UNSUPPORTED_METHOD 115 935 #define BIO_R_WRITE_TO_READ_ONLY_BIO 116 936 937 #endif // OPENSSL_HEADER_BIO_H 938