1 /* $OpenBSD: bf_buff.c,v 1.28 2023/07/05 21:23:37 beck Exp $ */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59 #include <errno.h> 60 #include <stdio.h> 61 #include <string.h> 62 63 #include <openssl/bio.h> 64 #include <openssl/err.h> 65 66 #include "bio_local.h" 67 68 static int buffer_write(BIO *h, const char *buf, int num); 69 static int buffer_read(BIO *h, char *buf, int size); 70 static int buffer_puts(BIO *h, const char *str); 71 static int buffer_gets(BIO *h, char *str, int size); 72 static long buffer_ctrl(BIO *h, int cmd, long arg1, void *arg2); 73 static int buffer_new(BIO *h); 74 static int buffer_free(BIO *data); 75 static long buffer_callback_ctrl(BIO *h, int cmd, BIO_info_cb *fp); 76 #define DEFAULT_BUFFER_SIZE 4096 77 78 static const BIO_METHOD methods_buffer = { 79 .type = BIO_TYPE_BUFFER, 80 .name = "buffer", 81 .bwrite = buffer_write, 82 .bread = buffer_read, 83 .bputs = buffer_puts, 84 .bgets = buffer_gets, 85 .ctrl = buffer_ctrl, 86 .create = buffer_new, 87 .destroy = buffer_free, 88 .callback_ctrl = buffer_callback_ctrl 89 }; 90 91 const BIO_METHOD * 92 BIO_f_buffer(void) 93 { 94 return (&methods_buffer); 95 } 96 LCRYPTO_ALIAS(BIO_f_buffer); 97 98 static int 99 buffer_new(BIO *bi) 100 { 101 BIO_F_BUFFER_CTX *ctx; 102 103 ctx = malloc(sizeof(BIO_F_BUFFER_CTX)); 104 if (ctx == NULL) 105 return (0); 106 ctx->ibuf = malloc(DEFAULT_BUFFER_SIZE); 107 if (ctx->ibuf == NULL) { 108 free(ctx); 109 return (0); 110 } 111 ctx->obuf = malloc(DEFAULT_BUFFER_SIZE); 112 if (ctx->obuf == NULL) { 113 free(ctx->ibuf); 114 free(ctx); 115 return (0); 116 } 117 ctx->ibuf_size = DEFAULT_BUFFER_SIZE; 118 ctx->obuf_size = DEFAULT_BUFFER_SIZE; 119 ctx->ibuf_len = 0; 120 ctx->ibuf_off = 0; 121 ctx->obuf_len = 0; 122 ctx->obuf_off = 0; 123 124 bi->init = 1; 125 bi->ptr = (char *)ctx; 126 bi->flags = 0; 127 return (1); 128 } 129 130 static int 131 buffer_free(BIO *a) 132 { 133 BIO_F_BUFFER_CTX *b; 134 135 if (a == NULL) 136 return (0); 137 b = (BIO_F_BUFFER_CTX *)a->ptr; 138 free(b->ibuf); 139 free(b->obuf); 140 free(a->ptr); 141 a->ptr = NULL; 142 a->init = 0; 143 a->flags = 0; 144 return (1); 145 } 146 147 static int 148 buffer_read(BIO *b, char *out, int outl) 149 { 150 int i, num = 0; 151 BIO_F_BUFFER_CTX *ctx; 152 153 if (out == NULL) 154 return (0); 155 ctx = (BIO_F_BUFFER_CTX *)b->ptr; 156 157 if ((ctx == NULL) || (b->next_bio == NULL)) 158 return (0); 159 num = 0; 160 BIO_clear_retry_flags(b); 161 162 start: 163 i = ctx->ibuf_len; 164 /* If there is stuff left over, grab it */ 165 if (i != 0) { 166 if (i > outl) 167 i = outl; 168 memcpy(out, &(ctx->ibuf[ctx->ibuf_off]), i); 169 ctx->ibuf_off += i; 170 ctx->ibuf_len -= i; 171 num += i; 172 if (outl == i) 173 return (num); 174 outl -= i; 175 out += i; 176 } 177 178 /* We may have done a partial read. try to do more. 179 * We have nothing in the buffer. 180 * If we get an error and have read some data, just return it 181 * and let them retry to get the error again. 182 * copy direct to parent address space */ 183 if (outl > ctx->ibuf_size) { 184 for (;;) { 185 i = BIO_read(b->next_bio, out, outl); 186 if (i <= 0) { 187 BIO_copy_next_retry(b); 188 if (i < 0) 189 return ((num > 0) ? num : i); 190 if (i == 0) 191 return (num); 192 } 193 num += i; 194 if (outl == i) 195 return (num); 196 out += i; 197 outl -= i; 198 } 199 } 200 /* else */ 201 202 /* we are going to be doing some buffering */ 203 i = BIO_read(b->next_bio, ctx->ibuf, ctx->ibuf_size); 204 if (i <= 0) { 205 BIO_copy_next_retry(b); 206 if (i < 0) 207 return ((num > 0) ? num : i); 208 if (i == 0) 209 return (num); 210 } 211 ctx->ibuf_off = 0; 212 ctx->ibuf_len = i; 213 214 /* Lets re-read using ourselves :-) */ 215 goto start; 216 } 217 218 static int 219 buffer_write(BIO *b, const char *in, int inl) 220 { 221 int i, num = 0; 222 BIO_F_BUFFER_CTX *ctx; 223 224 if ((in == NULL) || (inl <= 0)) 225 return (0); 226 ctx = (BIO_F_BUFFER_CTX *)b->ptr; 227 if ((ctx == NULL) || (b->next_bio == NULL)) 228 return (0); 229 230 BIO_clear_retry_flags(b); 231 start: 232 i = ctx->obuf_size - (ctx->obuf_len + ctx->obuf_off); 233 /* add to buffer and return */ 234 if (i >= inl) { 235 memcpy(&(ctx->obuf[ctx->obuf_off + ctx->obuf_len]), in, inl); 236 ctx->obuf_len += inl; 237 return (num + inl); 238 } 239 /* else */ 240 /* stuff already in buffer, so add to it first, then flush */ 241 if (ctx->obuf_len != 0) { 242 if (i > 0) /* lets fill it up if we can */ 243 { 244 memcpy(&(ctx->obuf[ctx->obuf_off + ctx->obuf_len]), in, i); 245 in += i; 246 inl -= i; 247 num += i; 248 ctx->obuf_len += i; 249 } 250 /* we now have a full buffer needing flushing */ 251 for (;;) { 252 i = BIO_write(b->next_bio, &(ctx->obuf[ctx->obuf_off]), 253 ctx->obuf_len); 254 if (i <= 0) { 255 BIO_copy_next_retry(b); 256 257 if (i < 0) 258 return ((num > 0) ? num : i); 259 if (i == 0) 260 return (num); 261 } 262 ctx->obuf_off += i; 263 ctx->obuf_len -= i; 264 if (ctx->obuf_len == 0) 265 break; 266 } 267 } 268 /* we only get here if the buffer has been flushed and we 269 * still have stuff to write */ 270 ctx->obuf_off = 0; 271 272 /* we now have inl bytes to write */ 273 while (inl >= ctx->obuf_size) { 274 i = BIO_write(b->next_bio, in, inl); 275 if (i <= 0) { 276 BIO_copy_next_retry(b); 277 if (i < 0) 278 return ((num > 0) ? num : i); 279 if (i == 0) 280 return (num); 281 } 282 num += i; 283 in += i; 284 inl -= i; 285 if (inl == 0) 286 return (num); 287 } 288 289 /* copy the rest into the buffer since we have only a small 290 * amount left */ 291 goto start; 292 } 293 294 static long 295 buffer_ctrl(BIO *b, int cmd, long num, void *ptr) 296 { 297 BIO *dbio; 298 BIO_F_BUFFER_CTX *ctx; 299 long ret = 1; 300 char *p1, *p2; 301 int r, i, *ip; 302 int ibs, obs; 303 304 ctx = (BIO_F_BUFFER_CTX *)b->ptr; 305 306 switch (cmd) { 307 case BIO_CTRL_RESET: 308 ctx->ibuf_off = 0; 309 ctx->ibuf_len = 0; 310 ctx->obuf_off = 0; 311 ctx->obuf_len = 0; 312 if (b->next_bio == NULL) 313 return (0); 314 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 315 break; 316 case BIO_CTRL_INFO: 317 ret = (long)ctx->obuf_len; 318 break; 319 case BIO_C_GET_BUFF_NUM_LINES: 320 ret = 0; 321 p1 = ctx->ibuf; 322 for (i = 0; i < ctx->ibuf_len; i++) { 323 if (p1[ctx->ibuf_off + i] == '\n') 324 ret++; 325 } 326 break; 327 case BIO_CTRL_WPENDING: 328 ret = (long)ctx->obuf_len; 329 if (ret == 0) { 330 if (b->next_bio == NULL) 331 return (0); 332 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 333 } 334 break; 335 case BIO_CTRL_PENDING: 336 ret = (long)ctx->ibuf_len; 337 if (ret == 0) { 338 if (b->next_bio == NULL) 339 return (0); 340 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 341 } 342 break; 343 case BIO_C_SET_BUFF_READ_DATA: 344 if (num > ctx->ibuf_size) { 345 p1 = malloc(num); 346 if (p1 == NULL) 347 goto malloc_error; 348 free(ctx->ibuf); 349 ctx->ibuf = p1; 350 } 351 ctx->ibuf_off = 0; 352 ctx->ibuf_len = (int)num; 353 memcpy(ctx->ibuf, ptr, num); 354 ret = 1; 355 break; 356 case BIO_C_SET_BUFF_SIZE: 357 if (ptr != NULL) { 358 ip = (int *)ptr; 359 if (*ip == 0) { 360 ibs = (int)num; 361 obs = ctx->obuf_size; 362 } 363 else /* if (*ip == 1) */ 364 { 365 ibs = ctx->ibuf_size; 366 obs = (int)num; 367 } 368 } else { 369 ibs = (int)num; 370 obs = (int)num; 371 } 372 p1 = ctx->ibuf; 373 p2 = ctx->obuf; 374 if ((ibs > DEFAULT_BUFFER_SIZE) && (ibs != ctx->ibuf_size)) { 375 p1 = malloc(num); 376 if (p1 == NULL) 377 goto malloc_error; 378 } 379 if ((obs > DEFAULT_BUFFER_SIZE) && (obs != ctx->obuf_size)) { 380 p2 = malloc(num); 381 if (p2 == NULL) { 382 if (p1 != ctx->ibuf) 383 free(p1); 384 goto malloc_error; 385 } 386 } 387 if (ctx->ibuf != p1) { 388 free(ctx->ibuf); 389 ctx->ibuf = p1; 390 ctx->ibuf_off = 0; 391 ctx->ibuf_len = 0; 392 ctx->ibuf_size = ibs; 393 } 394 if (ctx->obuf != p2) { 395 free(ctx->obuf); 396 ctx->obuf = p2; 397 ctx->obuf_off = 0; 398 ctx->obuf_len = 0; 399 ctx->obuf_size = obs; 400 } 401 break; 402 case BIO_C_DO_STATE_MACHINE: 403 if (b->next_bio == NULL) 404 return (0); 405 BIO_clear_retry_flags(b); 406 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 407 BIO_copy_next_retry(b); 408 break; 409 410 case BIO_CTRL_FLUSH: 411 if (b->next_bio == NULL) 412 return (0); 413 if (ctx->obuf_len <= 0) { 414 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 415 break; 416 } 417 418 for (;;) { 419 BIO_clear_retry_flags(b); 420 if (ctx->obuf_len > 0) { 421 r = BIO_write(b->next_bio, 422 &(ctx->obuf[ctx->obuf_off]), 423 ctx->obuf_len); 424 BIO_copy_next_retry(b); 425 if (r <= 0) 426 return ((long)r); 427 ctx->obuf_off += r; 428 ctx->obuf_len -= r; 429 } else { 430 ctx->obuf_len = 0; 431 ctx->obuf_off = 0; 432 break; 433 } 434 } 435 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 436 break; 437 case BIO_CTRL_DUP: 438 dbio = (BIO *)ptr; 439 if (!BIO_set_read_buffer_size(dbio, ctx->ibuf_size) || 440 !BIO_set_write_buffer_size(dbio, ctx->obuf_size)) 441 ret = 0; 442 break; 443 default: 444 if (b->next_bio == NULL) 445 return (0); 446 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 447 break; 448 } 449 return (ret); 450 malloc_error: 451 BIOerror(ERR_R_MALLOC_FAILURE); 452 return (0); 453 } 454 455 static long 456 buffer_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp) 457 { 458 long ret = 1; 459 460 if (b->next_bio == NULL) 461 return (0); 462 switch (cmd) { 463 default: 464 ret = BIO_callback_ctrl(b->next_bio, cmd, fp); 465 break; 466 } 467 return (ret); 468 } 469 470 static int 471 buffer_gets(BIO *b, char *buf, int size) 472 { 473 BIO_F_BUFFER_CTX *ctx; 474 int num = 0, i, flag; 475 char *p; 476 477 ctx = (BIO_F_BUFFER_CTX *)b->ptr; 478 size--; /* reserve space for a '\0' */ 479 BIO_clear_retry_flags(b); 480 481 for (;;) { 482 if (ctx->ibuf_len > 0) { 483 p = &(ctx->ibuf[ctx->ibuf_off]); 484 flag = 0; 485 for (i = 0; (i < ctx->ibuf_len) && (i < size); i++) { 486 *(buf++) = p[i]; 487 if (p[i] == '\n') { 488 flag = 1; 489 i++; 490 break; 491 } 492 } 493 num += i; 494 size -= i; 495 ctx->ibuf_len -= i; 496 ctx->ibuf_off += i; 497 if (flag || size == 0) { 498 *buf = '\0'; 499 return (num); 500 } 501 } 502 else /* read another chunk */ 503 { 504 i = BIO_read(b->next_bio, ctx->ibuf, ctx->ibuf_size); 505 if (i <= 0) { 506 BIO_copy_next_retry(b); 507 *buf = '\0'; 508 if (i < 0) 509 return ((num > 0) ? num : i); 510 if (i == 0) 511 return (num); 512 } 513 ctx->ibuf_len = i; 514 ctx->ibuf_off = 0; 515 } 516 } 517 } 518 519 static int 520 buffer_puts(BIO *b, const char *str) 521 { 522 return (buffer_write(b, str, strlen(str))); 523 } 524