crypto/bio/bf_buff.c

   1 /* crypto/bio/bf_buff.c */
   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 <stdio.h>
  60 #include <errno.h>
  61 #include "cryptlib.h"
  62 #include <openssl/bio.h>
  63
  64 static int buffer_write(BIO *h, const char *buf, int num);
  65 static int buffer_read(BIO *h, char *buf, int size);
  66 static int buffer_puts(BIO *h, const char *str);
  67 static int buffer_gets(BIO *h, char *str, int size);
  68 static long buffer_ctrl(BIO *h, int cmd, long arg1, void *arg2);
  69 static int buffer_new(BIO *h);
  70 static int buffer_free(BIO *data);
  71 static long buffer_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
  72 #define DEFAULT_BUFFER_SIZE     4096
  73
  74 static BIO_METHOD methods_buffer = {
  75     BIO_TYPE_BUFFER,
  76     "buffer",
  77     buffer_write,
  78     buffer_read,
  79     buffer_puts,
  80     buffer_gets,
  81     buffer_ctrl,
  82     buffer_new,
  83     buffer_free,
  84     buffer_callback_ctrl,
  85 };
  86
  87 BIO_METHOD *BIO_f_buffer(void)
  88 {
  89     return (&methods_buffer);
  90 }
  91
  92 static int buffer_new(BIO *bi)
  93 {
  94     BIO_F_BUFFER_CTX *ctx;
  95
  96     ctx = OPENSSL_malloc(sizeof(BIO_F_BUFFER_CTX));
  97     if (ctx == NULL)
  98         return (0);
  99     ctx->ibuf = OPENSSL_malloc(DEFAULT_BUFFER_SIZE);
 100     if (ctx->ibuf == NULL) {
 101         OPENSSL_free(ctx);
 102         return (0);
 103     }
 104     ctx->obuf = OPENSSL_malloc(DEFAULT_BUFFER_SIZE);
 105     if (ctx->obuf == NULL) {
 106         OPENSSL_free(ctx->ibuf);
 107         OPENSSL_free(ctx);
 108         return (0);
 109     }
 110     ctx->ibuf_size = DEFAULT_BUFFER_SIZE;
 111     ctx->obuf_size = DEFAULT_BUFFER_SIZE;
 112     ctx->ibuf_len = 0;
 113     ctx->ibuf_off = 0;
 114     ctx->obuf_len = 0;
 115     ctx->obuf_off = 0;
 116
 117     bi->init = 1;
 118     bi->ptr = (char *)ctx;
 119     bi->flags = 0;
 120     return (1);
 121 }
 122
 123 static int buffer_free(BIO *a)
 124 {
 125     BIO_F_BUFFER_CTX *b;
 126
 127     if (a == NULL)
 128         return (0);
 129     b = (BIO_F_BUFFER_CTX *)a->ptr;
 130     if (b->ibuf != NULL)
 131         OPENSSL_free(b->ibuf);
 132     if (b->obuf != NULL)
 133         OPENSSL_free(b->obuf);
 134     OPENSSL_free(a->ptr);
 135     a->ptr = NULL;
 136     a->init = 0;
 137     a->flags = 0;
 138     return (1);
 139 }
 140
 141 static int buffer_read(BIO *b, char *out, int outl)
 142 {
 143     int i, num = 0;
 144     BIO_F_BUFFER_CTX *ctx;
 145
 146     if (out == NULL)
 147         return (0);
 148     ctx = (BIO_F_BUFFER_CTX *)b->ptr;
 149
 150     if ((ctx == NULL) || (b->next_bio == NULL))
 151         return (0);
 152     num = 0;
 153     BIO_clear_retry_flags(b);
 154
 155  start:
 156     i = ctx->ibuf_len;
 157     /* If there is stuff left over, grab it */
 158     if (i != 0) {
 159         if (i > outl)
 160             i = outl;
 161         memcpy(out, &(ctx->ibuf[ctx->ibuf_off]), i);
 162         ctx->ibuf_off += i;
 163         ctx->ibuf_len -= i;
 164         num += i;
 165         if (outl == i)
 166             return (num);
 167         outl -= i;
 168         out += i;
 169     }
 170
 171     /*
 172      * We may have done a partial read. try to do more. We have nothing in
 173      * the buffer. If we get an error and have read some data, just return it
 174      * and let them retry to get the error again. copy direct to parent
 175      * address space
 176      */
 177     if (outl > ctx->ibuf_size) {
 178         for (;;) {
 179             i = BIO_read(b->next_bio, out, outl);
 180             if (i <= 0) {
 181                 BIO_copy_next_retry(b);
 182                 if (i < 0)
 183                     return ((num > 0) ? num : i);
 184                 if (i == 0)
 185                     return (num);
 186             }
 187             num += i;
 188             if (outl == i)
 189                 return (num);
 190             out += i;
 191             outl -= i;
 192         }
 193     }
 194     /* else */
 195
 196     /* we are going to be doing some buffering */
 197     i = BIO_read(b->next_bio, ctx->ibuf, ctx->ibuf_size);
 198     if (i <= 0) {
 199         BIO_copy_next_retry(b);
 200         if (i < 0)
 201             return ((num > 0) ? num : i);
 202         if (i == 0)
 203             return (num);
 204     }
 205     ctx->ibuf_off = 0;
 206     ctx->ibuf_len = i;
 207
 208     /* Lets re-read using ourselves :-) */
 209     goto start;
 210 }
 211
 212 static int buffer_write(BIO *b, const char *in, int inl)
 213 {
 214     int i, num = 0;
 215     BIO_F_BUFFER_CTX *ctx;
 216
 217     if ((in == NULL) || (inl <= 0))
 218         return (0);
 219     ctx = (BIO_F_BUFFER_CTX *)b->ptr;
 220     if ((ctx == NULL) || (b->next_bio == NULL))
 221         return (0);
 222
 223     BIO_clear_retry_flags(b);
 224  start:
 225     i = ctx->obuf_size - (ctx->obuf_len + ctx->obuf_off);
 226     /* add to buffer and return */
 227     if (i >= inl) {
 228         memcpy(&(ctx->obuf[ctx->obuf_off + ctx->obuf_len]), in, inl);
 229         ctx->obuf_len += inl;
 230         return (num + inl);
 231     }
 232     /* else */
 233     /* stuff already in buffer, so add to it first, then flush */
 234     if (ctx->obuf_len != 0) {
 235         if (i > 0) {            /* lets fill it up if we can */
 236             memcpy(&(ctx->obuf[ctx->obuf_off + ctx->obuf_len]), in, i);
 237             in += i;
 238             inl -= i;
 239             num += i;
 240             ctx->obuf_len += i;
 241         }
 242         /* we now have a full buffer needing flushing */
 243         for (;;) {
 244             i = BIO_write(b->next_bio, &(ctx->obuf[ctx->obuf_off]),
 245                           ctx->obuf_len);
 246             if (i <= 0) {
 247                 BIO_copy_next_retry(b);
 248
 249                 if (i < 0)
 250                     return ((num > 0) ? num : i);
 251                 if (i == 0)
 252                     return (num);
 253             }
 254             ctx->obuf_off += i;
 255             ctx->obuf_len -= i;
 256             if (ctx->obuf_len == 0)
 257                 break;
 258         }
 259     }
 260     /*
 261      * we only get here if the buffer has been flushed and we still have
 262      * stuff to write
 263      */
 264     ctx->obuf_off = 0;
 265
 266     /* we now have inl bytes to write */
 267     while (inl >= ctx->obuf_size) {
 268         i = BIO_write(b->next_bio, in, inl);
 269         if (i <= 0) {
 270             BIO_copy_next_retry(b);
 271             if (i < 0)
 272                 return ((num > 0) ? num : i);
 273             if (i == 0)
 274                 return (num);
 275         }
 276         num += i;
 277         in += i;
 278         inl -= i;
 279         if (inl == 0)
 280             return (num);
 281     }
 282
 283     /*
 284      * copy the rest into the buffer since we have only a small amount left
 285      */
 286     goto start;
 287 }
 288
 289 static long buffer_ctrl(BIO *b, int cmd, long num, void *ptr)
 290 {
 291     BIO *dbio;
 292     BIO_F_BUFFER_CTX *ctx;
 293     long ret = 1;
 294     char *p1, *p2;
 295     int r, i, *ip;
 296     int ibs, obs;
 297
 298     ctx = (BIO_F_BUFFER_CTX *)b->ptr;
 299
 300     switch (cmd) {
 301     case BIO_CTRL_RESET:
 302         ctx->ibuf_off = 0;
 303         ctx->ibuf_len = 0;
 304         ctx->obuf_off = 0;
 305         ctx->obuf_len = 0;
 306         if (b->next_bio == NULL)
 307             return (0);
 308         ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
 309         break;
 310     case BIO_CTRL_INFO:
 311         ret = (long)ctx->obuf_len;
 312         break;
 313     case BIO_C_GET_BUFF_NUM_LINES:
 314         ret = 0;
 315         p1 = ctx->ibuf;
 316         for (i = 0; i < ctx->ibuf_len; i++) {
 317             if (p1[ctx->ibuf_off + i] == '\n')
 318                 ret++;
 319         }
 320         break;
 321     case BIO_CTRL_WPENDING:
 322         ret = (long)ctx->obuf_len;
 323         if (ret == 0) {
 324             if (b->next_bio == NULL)
 325                 return (0);
 326             ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
 327         }
 328         break;
 329     case BIO_CTRL_PENDING:
 330         ret = (long)ctx->ibuf_len;
 331         if (ret == 0) {
 332             if (b->next_bio == NULL)
 333                 return (0);
 334             ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
 335         }
 336         break;
 337     case BIO_C_SET_BUFF_READ_DATA:
 338         if (num > ctx->ibuf_size) {
 339             p1 = OPENSSL_malloc((int)num);
 340             if (p1 == NULL)
 341                 goto malloc_error;
 342             if (ctx->ibuf != NULL)
 343                 OPENSSL_free(ctx->ibuf);
 344             ctx->ibuf = p1;
 345         }
 346         ctx->ibuf_off = 0;
 347         ctx->ibuf_len = (int)num;
 348         memcpy(ctx->ibuf, ptr, (int)num);
 349         ret = 1;
 350         break;
 351     case BIO_C_SET_BUFF_SIZE:
 352         if (ptr != NULL) {
 353             ip = (int *)ptr;
 354             if (*ip == 0) {
 355                 ibs = (int)num;
 356                 obs = ctx->obuf_size;
 357             } else {            /* if (*ip == 1) */
 358
 359                 ibs = ctx->ibuf_size;
 360                 obs = (int)num;
 361             }
 362         } else {
 363             ibs = (int)num;
 364             obs = (int)num;
 365         }
 366         p1 = ctx->ibuf;
 367         p2 = ctx->obuf;
 368         if ((ibs > DEFAULT_BUFFER_SIZE) && (ibs != ctx->ibuf_size)) {
 369             p1 = OPENSSL_malloc((int)num);
 370             if (p1 == NULL)
 371                 goto malloc_error;
 372         }
 373         if ((obs > DEFAULT_BUFFER_SIZE) && (obs != ctx->obuf_size)) {
 374             p2 = OPENSSL_malloc((int)num);
 375             if (p2 == NULL) {
 376                 if (p1 != ctx->ibuf)
 377                     OPENSSL_free(p1);
 378                 goto malloc_error;
 379             }
 380         }
 381         if (ctx->ibuf != p1) {
 382             OPENSSL_free(ctx->ibuf);
 383             ctx->ibuf = p1;
 384             ctx->ibuf_off = 0;
 385             ctx->ibuf_len = 0;
 386             ctx->ibuf_size = ibs;
 387         }
 388         if (ctx->obuf != p2) {
 389             OPENSSL_free(ctx->obuf);
 390             ctx->obuf = p2;
 391             ctx->obuf_off = 0;
 392             ctx->obuf_len = 0;
 393             ctx->obuf_size = obs;
 394         }
 395         break;
 396     case BIO_C_DO_STATE_MACHINE:
 397         if (b->next_bio == NULL)
 398             return (0);
 399         BIO_clear_retry_flags(b);
 400         ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
 401         BIO_copy_next_retry(b);
 402         break;
 403
 404     case BIO_CTRL_FLUSH:
 405         if (b->next_bio == NULL)
 406             return (0);
 407         if (ctx->obuf_len <= 0) {
 408             ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
 409             break;
 410         }
 411
 412         for (;;) {
 413             BIO_clear_retry_flags(b);
 414             if (ctx->obuf_len > 0) {
 415                 r = BIO_write(b->next_bio,
 416                               &(ctx->obuf[ctx->obuf_off]), ctx->obuf_len);
 417                 BIO_copy_next_retry(b);
 418                 if (r <= 0)
 419                     return ((long)r);
 420                 ctx->obuf_off += r;
 421                 ctx->obuf_len -= r;
 422             } else {
 423                 ctx->obuf_len = 0;
 424                 ctx->obuf_off = 0;
 425                 ret = 1;
 426                 break;
 427             }
 428         }
 429         ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
 430         break;
 431     case BIO_CTRL_DUP:
 432         dbio = (BIO *)ptr;
 433         if (!BIO_set_read_buffer_size(dbio, ctx->ibuf_size) ||
 434             !BIO_set_write_buffer_size(dbio, ctx->obuf_size))
 435             ret = 0;
 436         break;
 437     default:
 438         if (b->next_bio == NULL)
 439             return (0);
 440         ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
 441         break;
 442     }
 443     return (ret);
 444  malloc_error:
 445     BIOerr(BIO_F_BUFFER_CTRL, ERR_R_MALLOC_FAILURE);
 446     return (0);
 447 }
 448
 449 static long buffer_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
 450 {
 451     long ret = 1;
 452
 453     if (b->next_bio == NULL)
 454         return (0);
 455     switch (cmd) {
 456     default:
 457         ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
 458         break;
 459     }
 460     return (ret);
 461 }
 462
 463 static int buffer_gets(BIO *b, char *buf, int size)
 464 {
 465     BIO_F_BUFFER_CTX *ctx;
 466     int num = 0, i, flag;
 467     char *p;
 468
 469     ctx = (BIO_F_BUFFER_CTX *)b->ptr;
 470     size--;                     /* reserve space for a '\0' */
 471     BIO_clear_retry_flags(b);
 472
 473     for (;;) {
 474         if (ctx->ibuf_len > 0) {
 475             p = &(ctx->ibuf[ctx->ibuf_off]);
 476             flag = 0;
 477             for (i = 0; (i < ctx->ibuf_len) && (i < size); i++) {
 478                 *(buf++) = p[i];
 479                 if (p[i] == '\n') {
 480                     flag = 1;
 481                     i++;
 482                     break;
 483                 }
 484             }
 485             num += i;
 486             size -= i;
 487             ctx->ibuf_len -= i;
 488             ctx->ibuf_off += i;
 489             if (flag || size == 0) {
 490                 *buf = '\0';
 491                 return (num);
 492             }
 493         } else {                /* read another chunk */
 494
 495             i = BIO_read(b->next_bio, ctx->ibuf, ctx->ibuf_size);
 496             if (i <= 0) {
 497                 BIO_copy_next_retry(b);
 498                 *buf = '\0';
 499                 if (i < 0)
 500                     return ((num > 0) ? num : i);
 501                 if (i == 0)
 502                     return (num);
 503             }
 504             ctx->ibuf_len = i;
 505             ctx->ibuf_off = 0;
 506         }
 507     }
 508 }
 509
 510 static int buffer_puts(BIO *b, const char *str)
 511 {
 512     return (buffer_write(b, str, strlen(str)));
 513 }