1 /* $OpenBSD: bf_buff.c,v 1.22 2015/07/19 01:18:17 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 static int buffer_write(BIO *h, const char *buf, int num); 67 static int buffer_read(BIO *h, char *buf, int size); 68 static int buffer_puts(BIO *h, const char *str); 69 static int buffer_gets(BIO *h, char *str, int size); 70 static long buffer_ctrl(BIO *h, int cmd, long arg1, void *arg2); 71 static int buffer_new(BIO *h); 72 static int buffer_free(BIO *data); 73 static long buffer_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp); 74 #define DEFAULT_BUFFER_SIZE 4096 75 76 static BIO_METHOD methods_buffer = { 77 .type = BIO_TYPE_BUFFER, 78 .name = "buffer", 79 .bwrite = buffer_write, 80 .bread = buffer_read, 81 .bputs = buffer_puts, 82 .bgets = buffer_gets, 83 .ctrl = buffer_ctrl, 84 .create = buffer_new, 85 .destroy = buffer_free, 86 .callback_ctrl = buffer_callback_ctrl 87 }; 88 89 BIO_METHOD * 90 BIO_f_buffer(void) 91 { 92 return (&methods_buffer); 93 } 94 95 static int 96 buffer_new(BIO *bi) 97 { 98 BIO_F_BUFFER_CTX *ctx; 99 100 ctx = malloc(sizeof(BIO_F_BUFFER_CTX)); 101 if (ctx == NULL) 102 return (0); 103 ctx->ibuf = malloc(DEFAULT_BUFFER_SIZE); 104 if (ctx->ibuf == NULL) { 105 free(ctx); 106 return (0); 107 } 108 ctx->obuf = malloc(DEFAULT_BUFFER_SIZE); 109 if (ctx->obuf == NULL) { 110 free(ctx->ibuf); 111 free(ctx); 112 return (0); 113 } 114 ctx->ibuf_size = DEFAULT_BUFFER_SIZE; 115 ctx->obuf_size = DEFAULT_BUFFER_SIZE; 116 ctx->ibuf_len = 0; 117 ctx->ibuf_off = 0; 118 ctx->obuf_len = 0; 119 ctx->obuf_off = 0; 120 121 bi->init = 1; 122 bi->ptr = (char *)ctx; 123 bi->flags = 0; 124 return (1); 125 } 126 127 static int 128 buffer_free(BIO *a) 129 { 130 BIO_F_BUFFER_CTX *b; 131 132 if (a == NULL) 133 return (0); 134 b = (BIO_F_BUFFER_CTX *)a->ptr; 135 free(b->ibuf); 136 free(b->obuf); 137 free(a->ptr); 138 a->ptr = NULL; 139 a->init = 0; 140 a->flags = 0; 141 return (1); 142 } 143 144 static int 145 buffer_read(BIO *b, char *out, int outl) 146 { 147 int i, num = 0; 148 BIO_F_BUFFER_CTX *ctx; 149 150 if (out == NULL) 151 return (0); 152 ctx = (BIO_F_BUFFER_CTX *)b->ptr; 153 154 if ((ctx == NULL) || (b->next_bio == NULL)) 155 return (0); 156 num = 0; 157 BIO_clear_retry_flags(b); 158 159 start: 160 i = ctx->ibuf_len; 161 /* If there is stuff left over, grab it */ 162 if (i != 0) { 163 if (i > outl) 164 i = outl; 165 memcpy(out, &(ctx->ibuf[ctx->ibuf_off]), i); 166 ctx->ibuf_off += i; 167 ctx->ibuf_len -= i; 168 num += i; 169 if (outl == i) 170 return (num); 171 outl -= i; 172 out += i; 173 } 174 175 /* We may have done a partial read. try to do more. 176 * We have nothing in the buffer. 177 * If we get an error and have read some data, just return it 178 * and let them retry to get the error again. 179 * copy direct to parent address space */ 180 if (outl > ctx->ibuf_size) { 181 for (;;) { 182 i = BIO_read(b->next_bio, out, outl); 183 if (i <= 0) { 184 BIO_copy_next_retry(b); 185 if (i < 0) 186 return ((num > 0) ? num : i); 187 if (i == 0) 188 return (num); 189 } 190 num += i; 191 if (outl == i) 192 return (num); 193 out += i; 194 outl -= i; 195 } 196 } 197 /* else */ 198 199 /* we are going to be doing some buffering */ 200 i = BIO_read(b->next_bio, ctx->ibuf, ctx->ibuf_size); 201 if (i <= 0) { 202 BIO_copy_next_retry(b); 203 if (i < 0) 204 return ((num > 0) ? num : i); 205 if (i == 0) 206 return (num); 207 } 208 ctx->ibuf_off = 0; 209 ctx->ibuf_len = i; 210 211 /* Lets re-read using ourselves :-) */ 212 goto start; 213 } 214 215 static int 216 buffer_write(BIO *b, const char *in, int inl) 217 { 218 int i, num = 0; 219 BIO_F_BUFFER_CTX *ctx; 220 221 if ((in == NULL) || (inl <= 0)) 222 return (0); 223 ctx = (BIO_F_BUFFER_CTX *)b->ptr; 224 if ((ctx == NULL) || (b->next_bio == NULL)) 225 return (0); 226 227 BIO_clear_retry_flags(b); 228 start: 229 i = ctx->obuf_size - (ctx->obuf_len + ctx->obuf_off); 230 /* add to buffer and return */ 231 if (i >= inl) { 232 memcpy(&(ctx->obuf[ctx->obuf_off + ctx->obuf_len]), in, inl); 233 ctx->obuf_len += inl; 234 return (num + inl); 235 } 236 /* else */ 237 /* stuff already in buffer, so add to it first, then flush */ 238 if (ctx->obuf_len != 0) { 239 if (i > 0) /* lets fill it up if we can */ 240 { 241 memcpy(&(ctx->obuf[ctx->obuf_off + ctx->obuf_len]), in, i); 242 in += i; 243 inl -= i; 244 num += i; 245 ctx->obuf_len += i; 246 } 247 /* we now have a full buffer needing flushing */ 248 for (;;) { 249 i = BIO_write(b->next_bio, &(ctx->obuf[ctx->obuf_off]), 250 ctx->obuf_len); 251 if (i <= 0) { 252 BIO_copy_next_retry(b); 253 254 if (i < 0) 255 return ((num > 0) ? num : i); 256 if (i == 0) 257 return (num); 258 } 259 ctx->obuf_off += i; 260 ctx->obuf_len -= i; 261 if (ctx->obuf_len == 0) 262 break; 263 } 264 } 265 /* we only get here if the buffer has been flushed and we 266 * still have stuff to write */ 267 ctx->obuf_off = 0; 268 269 /* we now have inl bytes to write */ 270 while (inl >= ctx->obuf_size) { 271 i = BIO_write(b->next_bio, in, inl); 272 if (i <= 0) { 273 BIO_copy_next_retry(b); 274 if (i < 0) 275 return ((num > 0) ? num : i); 276 if (i == 0) 277 return (num); 278 } 279 num += i; 280 in += i; 281 inl -= i; 282 if (inl == 0) 283 return (num); 284 } 285 286 /* copy the rest into the buffer since we have only a small 287 * amount left */ 288 goto start; 289 } 290 291 static long 292 buffer_ctrl(BIO *b, int cmd, long num, void *ptr) 293 { 294 BIO *dbio; 295 BIO_F_BUFFER_CTX *ctx; 296 long ret = 1; 297 char *p1, *p2; 298 int r, i, *ip; 299 int ibs, obs; 300 301 ctx = (BIO_F_BUFFER_CTX *)b->ptr; 302 303 switch (cmd) { 304 case BIO_CTRL_RESET: 305 ctx->ibuf_off = 0; 306 ctx->ibuf_len = 0; 307 ctx->obuf_off = 0; 308 ctx->obuf_len = 0; 309 if (b->next_bio == NULL) 310 return (0); 311 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 312 break; 313 case BIO_CTRL_INFO: 314 ret = (long)ctx->obuf_len; 315 break; 316 case BIO_C_GET_BUFF_NUM_LINES: 317 ret = 0; 318 p1 = ctx->ibuf; 319 for (i = 0; i < ctx->ibuf_len; i++) { 320 if (p1[ctx->ibuf_off + i] == '\n') 321 ret++; 322 } 323 break; 324 case BIO_CTRL_WPENDING: 325 ret = (long)ctx->obuf_len; 326 if (ret == 0) { 327 if (b->next_bio == NULL) 328 return (0); 329 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 330 } 331 break; 332 case BIO_CTRL_PENDING: 333 ret = (long)ctx->ibuf_len; 334 if (ret == 0) { 335 if (b->next_bio == NULL) 336 return (0); 337 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 338 } 339 break; 340 case BIO_C_SET_BUFF_READ_DATA: 341 if (num > ctx->ibuf_size) { 342 p1 = malloc(num); 343 if (p1 == NULL) 344 goto malloc_error; 345 free(ctx->ibuf); 346 ctx->ibuf = p1; 347 } 348 ctx->ibuf_off = 0; 349 ctx->ibuf_len = (int)num; 350 memcpy(ctx->ibuf, ptr, num); 351 ret = 1; 352 break; 353 case BIO_C_SET_BUFF_SIZE: 354 if (ptr != NULL) { 355 ip = (int *)ptr; 356 if (*ip == 0) { 357 ibs = (int)num; 358 obs = ctx->obuf_size; 359 } 360 else /* if (*ip == 1) */ 361 { 362 ibs = ctx->ibuf_size; 363 obs = (int)num; 364 } 365 } else { 366 ibs = (int)num; 367 obs = (int)num; 368 } 369 p1 = ctx->ibuf; 370 p2 = ctx->obuf; 371 if ((ibs > DEFAULT_BUFFER_SIZE) && (ibs != ctx->ibuf_size)) { 372 p1 = malloc(num); 373 if (p1 == NULL) 374 goto malloc_error; 375 } 376 if ((obs > DEFAULT_BUFFER_SIZE) && (obs != ctx->obuf_size)) { 377 p2 = malloc(num); 378 if (p2 == NULL) { 379 if (p1 != ctx->ibuf) 380 free(p1); 381 goto malloc_error; 382 } 383 } 384 if (ctx->ibuf != p1) { 385 free(ctx->ibuf); 386 ctx->ibuf = p1; 387 ctx->ibuf_off = 0; 388 ctx->ibuf_len = 0; 389 ctx->ibuf_size = ibs; 390 } 391 if (ctx->obuf != p2) { 392 free(ctx->obuf); 393 ctx->obuf = p2; 394 ctx->obuf_off = 0; 395 ctx->obuf_len = 0; 396 ctx->obuf_size = obs; 397 } 398 break; 399 case BIO_C_DO_STATE_MACHINE: 400 if (b->next_bio == NULL) 401 return (0); 402 BIO_clear_retry_flags(b); 403 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 404 BIO_copy_next_retry(b); 405 break; 406 407 case BIO_CTRL_FLUSH: 408 if (b->next_bio == NULL) 409 return (0); 410 if (ctx->obuf_len <= 0) { 411 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 412 break; 413 } 414 415 for (;;) { 416 BIO_clear_retry_flags(b); 417 if (ctx->obuf_len > 0) { 418 r = BIO_write(b->next_bio, 419 &(ctx->obuf[ctx->obuf_off]), 420 ctx->obuf_len); 421 BIO_copy_next_retry(b); 422 if (r <= 0) 423 return ((long)r); 424 ctx->obuf_off += r; 425 ctx->obuf_len -= r; 426 } else { 427 ctx->obuf_len = 0; 428 ctx->obuf_off = 0; 429 break; 430 } 431 } 432 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 433 break; 434 case BIO_CTRL_DUP: 435 dbio = (BIO *)ptr; 436 if (!BIO_set_read_buffer_size(dbio, ctx->ibuf_size) || 437 !BIO_set_write_buffer_size(dbio, ctx->obuf_size)) 438 ret = 0; 439 break; 440 default: 441 if (b->next_bio == NULL) 442 return (0); 443 ret = BIO_ctrl(b->next_bio, cmd, num, ptr); 444 break; 445 } 446 return (ret); 447 malloc_error: 448 BIOerr(BIO_F_BUFFER_CTRL, ERR_R_MALLOC_FAILURE); 449 return (0); 450 } 451 452 static long 453 buffer_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp) 454 { 455 long ret = 1; 456 457 if (b->next_bio == NULL) 458 return (0); 459 switch (cmd) { 460 default: 461 ret = BIO_callback_ctrl(b->next_bio, cmd, fp); 462 break; 463 } 464 return (ret); 465 } 466 467 static int 468 buffer_gets(BIO *b, char *buf, int size) 469 { 470 BIO_F_BUFFER_CTX *ctx; 471 int num = 0, i, flag; 472 char *p; 473 474 ctx = (BIO_F_BUFFER_CTX *)b->ptr; 475 size--; /* reserve space for a '\0' */ 476 BIO_clear_retry_flags(b); 477 478 for (;;) { 479 if (ctx->ibuf_len > 0) { 480 p = &(ctx->ibuf[ctx->ibuf_off]); 481 flag = 0; 482 for (i = 0; (i < ctx->ibuf_len) && (i < size); i++) { 483 *(buf++) = p[i]; 484 if (p[i] == '\n') { 485 flag = 1; 486 i++; 487 break; 488 } 489 } 490 num += i; 491 size -= i; 492 ctx->ibuf_len -= i; 493 ctx->ibuf_off += i; 494 if (flag || size == 0) { 495 *buf = '\0'; 496 return (num); 497 } 498 } 499 else /* read another chunk */ 500 { 501 i = BIO_read(b->next_bio, ctx->ibuf, ctx->ibuf_size); 502 if (i <= 0) { 503 BIO_copy_next_retry(b); 504 *buf = '\0'; 505 if (i < 0) 506 return ((num > 0) ? num : i); 507 if (i == 0) 508 return (num); 509 } 510 ctx->ibuf_len = i; 511 ctx->ibuf_off = 0; 512 } 513 } 514 } 515 516 static int 517 buffer_puts(BIO *b, const char *str) 518 { 519 return (buffer_write(b, str, strlen(str))); 520 } 521