crypto/openssl-0.9/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         {
  76         BIO_TYPE_BUFFER,
  77         "buffer",
  78         buffer_write,
  79         buffer_read,
  80         buffer_puts,
  81         buffer_gets,
  82         buffer_ctrl,
  83         buffer_new,
  84         buffer_free,
  85         buffer_callback_ctrl,
  86         };
  87
  88 BIO_METHOD *BIO_f_buffer(void)
  89         {
  90         return(&methods_buffer);
  91         }
  92
  93 static int buffer_new(BIO *bi)
  94         {
  95         BIO_F_BUFFER_CTX *ctx;
  96
  97         ctx=(BIO_F_BUFFER_CTX *)OPENSSL_malloc(sizeof(BIO_F_BUFFER_CTX));
  98         if (ctx == NULL) return(0);
  99         ctx->ibuf=(char *)OPENSSL_malloc(DEFAULT_BUFFER_SIZE);
 100         if (ctx->ibuf == NULL) { OPENSSL_free(ctx); return(0); }
 101         ctx->obuf=(char *)OPENSSL_malloc(DEFAULT_BUFFER_SIZE);
 102         if (ctx->obuf == NULL) { OPENSSL_free(ctx->ibuf); OPENSSL_free(ctx); return(0); }
 103         ctx->ibuf_size=DEFAULT_BUFFER_SIZE;
 104         ctx->obuf_size=DEFAULT_BUFFER_SIZE;
 105         ctx->ibuf_len=0;
 106         ctx->ibuf_off=0;
 107         ctx->obuf_len=0;
 108         ctx->obuf_off=0;
 109
 110         bi->init=1;
 111         bi->ptr=(char *)ctx;
 112         bi->flags=0;
 113         return(1);
 114         }
 115
 116 static int buffer_free(BIO *a)
 117         {
 118         BIO_F_BUFFER_CTX *b;
 119
 120         if (a == NULL) return(0);
 121         b=(BIO_F_BUFFER_CTX *)a->ptr;
 122         if (b->ibuf != NULL) OPENSSL_free(b->ibuf);
 123         if (b->obuf != NULL) OPENSSL_free(b->obuf);
 124         OPENSSL_free(a->ptr);
 125         a->ptr=NULL;
 126         a->init=0;
 127         a->flags=0;
 128         return(1);
 129         }
 130
 131 static int buffer_read(BIO *b, char *out, int outl)
 132         {
 133         int i,num=0;
 134         BIO_F_BUFFER_CTX *ctx;
 135
 136         if (out == NULL) return(0);
 137         ctx=(BIO_F_BUFFER_CTX *)b->ptr;
 138
 139         if ((ctx == NULL) || (b->next_bio == NULL)) return(0);
 140         num=0;
 141         BIO_clear_retry_flags(b);
 142
 143 start:
 144         i=ctx->ibuf_len;
 145         /* If there is stuff left over, grab it */
 146         if (i != 0)
 147                 {
 148                 if (i > outl) i=outl;
 149                 memcpy(out,&(ctx->ibuf[ctx->ibuf_off]),i);
 150                 ctx->ibuf_off+=i;
 151                 ctx->ibuf_len-=i;
 152                 num+=i;
 153                 if (outl == i)  return(num);
 154                 outl-=i;
 155                 out+=i;
 156                 }
 157
 158         /* We may have done a partial read. try to do more.
 159          * We have nothing in the buffer.
 160          * If we get an error and have read some data, just return it
 161          * and let them retry to get the error again.
 162          * copy direct to parent address space */
 163         if (outl > ctx->ibuf_size)
 164                 {
 165                 for (;;)
 166                         {
 167                         i=BIO_read(b->next_bio,out,outl);
 168                         if (i <= 0)
 169                                 {
 170                                 BIO_copy_next_retry(b);
 171                                 if (i < 0) return((num > 0)?num:i);
 172                                 if (i == 0) return(num);
 173                                 }
 174                         num+=i;
 175                         if (outl == i) return(num);
 176                         out+=i;
 177                         outl-=i;
 178                         }
 179                 }
 180         /* else */
 181
 182         /* we are going to be doing some buffering */
 183         i=BIO_read(b->next_bio,ctx->ibuf,ctx->ibuf_size);
 184         if (i <= 0)
 185                 {
 186                 BIO_copy_next_retry(b);
 187                 if (i < 0) return((num > 0)?num:i);
 188                 if (i == 0) return(num);
 189                 }
 190         ctx->ibuf_off=0;
 191         ctx->ibuf_len=i;
 192
 193         /* Lets re-read using ourselves :-) */
 194         goto start;
 195         }
 196
 197 static int buffer_write(BIO *b, const char *in, int inl)
 198         {
 199         int i,num=0;
 200         BIO_F_BUFFER_CTX *ctx;
 201
 202         if ((in == NULL) || (inl <= 0)) return(0);
 203         ctx=(BIO_F_BUFFER_CTX *)b->ptr;
 204         if ((ctx == NULL) || (b->next_bio == NULL)) return(0);
 205
 206         BIO_clear_retry_flags(b);
 207 start:
 208         i=ctx->obuf_size-(ctx->obuf_len+ctx->obuf_off);
 209         /* add to buffer and return */
 210         if (i >= inl)
 211                 {
 212                 memcpy(&(ctx->obuf[ctx->obuf_len]),in,inl);
 213                 ctx->obuf_len+=inl;
 214                 return(num+inl);
 215                 }
 216         /* else */
 217         /* stuff already in buffer, so add to it first, then flush */
 218         if (ctx->obuf_len != 0)
 219                 {
 220                 if (i > 0) /* lets fill it up if we can */
 221                         {
 222                         memcpy(&(ctx->obuf[ctx->obuf_len]),in,i);
 223                         in+=i;
 224                         inl-=i;
 225                         num+=i;
 226                         ctx->obuf_len+=i;
 227                         }
 228                 /* we now have a full buffer needing flushing */
 229                 for (;;)
 230                         {
 231                         i=BIO_write(b->next_bio,&(ctx->obuf[ctx->obuf_off]),
 232                                 ctx->obuf_len);
 233                         if (i <= 0)
 234                                 {
 235                                 BIO_copy_next_retry(b);
 236
 237                                 if (i < 0) return((num > 0)?num:i);
 238                                 if (i == 0) return(num);
 239                                 }
 240                         ctx->obuf_off+=i;
 241                         ctx->obuf_len-=i;
 242                         if (ctx->obuf_len == 0) break;
 243                         }
 244                 }
 245         /* we only get here if the buffer has been flushed and we
 246          * still have stuff to write */
 247         ctx->obuf_off=0;
 248
 249         /* we now have inl bytes to write */
 250         while (inl >= ctx->obuf_size)
 251                 {
 252                 i=BIO_write(b->next_bio,in,inl);
 253                 if (i <= 0)
 254                         {
 255                         BIO_copy_next_retry(b);
 256                         if (i < 0) return((num > 0)?num:i);
 257                         if (i == 0) return(num);
 258                         }
 259                 num+=i;
 260                 in+=i;
 261                 inl-=i;
 262                 if (inl == 0) return(num);
 263                 }
 264
 265         /* copy the rest into the buffer since we have only a small
 266          * amount left */
 267         goto start;
 268         }
 269
 270 static long buffer_ctrl(BIO *b, int cmd, long num, void *ptr)
 271         {
 272         BIO *dbio;
 273         BIO_F_BUFFER_CTX *ctx;
 274         long ret=1;
 275         char *p1,*p2;
 276         int r,i,*ip;
 277         int ibs,obs;
 278
 279         ctx=(BIO_F_BUFFER_CTX *)b->ptr;
 280
 281         switch (cmd)
 282                 {
 283         case BIO_CTRL_RESET:
 284                 ctx->ibuf_off=0;
 285                 ctx->ibuf_len=0;
 286                 ctx->obuf_off=0;
 287                 ctx->obuf_len=0;
 288                 if (b->next_bio == NULL) return(0);
 289                 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 290                 break;
 291         case BIO_CTRL_INFO:
 292                 ret=(long)ctx->obuf_len;
 293                 break;
 294         case BIO_C_GET_BUFF_NUM_LINES:
 295                 ret=0;
 296                 p1=ctx->ibuf;
 297                 for (i=ctx->ibuf_off; i<ctx->ibuf_len; i++)
 298                         {
 299                         if (p1[i] == '\n') ret++;
 300                         }
 301                 break;
 302         case BIO_CTRL_WPENDING:
 303                 ret=(long)ctx->obuf_len;
 304                 if (ret == 0)
 305                         {
 306                         if (b->next_bio == NULL) return(0);
 307                         ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 308                         }
 309                 break;
 310         case BIO_CTRL_PENDING:
 311                 ret=(long)ctx->ibuf_len;
 312                 if (ret == 0)
 313                         {
 314                         if (b->next_bio == NULL) return(0);
 315                         ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 316                         }
 317                 break;
 318         case BIO_C_SET_BUFF_READ_DATA:
 319                 if (num > ctx->ibuf_size)
 320                         {
 321                         p1=OPENSSL_malloc((int)num);
 322                         if (p1 == NULL) goto malloc_error;
 323                         if (ctx->ibuf != NULL) OPENSSL_free(ctx->ibuf);
 324                         ctx->ibuf=p1;
 325                         }
 326                 ctx->ibuf_off=0;
 327                 ctx->ibuf_len=(int)num;
 328                 memcpy(ctx->ibuf,ptr,(int)num);
 329                 ret=1;
 330                 break;
 331         case BIO_C_SET_BUFF_SIZE:
 332                 if (ptr != NULL)
 333                         {
 334                         ip=(int *)ptr;
 335                         if (*ip == 0)
 336                                 {
 337                                 ibs=(int)num;
 338                                 obs=ctx->obuf_size;
 339                                 }
 340                         else /* if (*ip == 1) */
 341                                 {
 342                                 ibs=ctx->ibuf_size;
 343                                 obs=(int)num;
 344                                 }
 345                         }
 346                 else
 347                         {
 348                         ibs=(int)num;
 349                         obs=(int)num;
 350                         }
 351                 p1=ctx->ibuf;
 352                 p2=ctx->obuf;
 353                 if ((ibs > DEFAULT_BUFFER_SIZE) && (ibs != ctx->ibuf_size))
 354                         {
 355                         p1=(char *)OPENSSL_malloc((int)num);
 356                         if (p1 == NULL) goto malloc_error;
 357                         }
 358                 if ((obs > DEFAULT_BUFFER_SIZE) && (obs != ctx->obuf_size))
 359                         {
 360                         p2=(char *)OPENSSL_malloc((int)num);
 361                         if (p2 == NULL)
 362                                 {
 363                                 if (p1 != ctx->ibuf) OPENSSL_free(p1);
 364                                 goto malloc_error;
 365                                 }
 366                         }
 367                 if (ctx->ibuf != p1)
 368                         {
 369                         OPENSSL_free(ctx->ibuf);
 370                         ctx->ibuf=p1;
 371                         ctx->ibuf_off=0;
 372                         ctx->ibuf_len=0;
 373                         ctx->ibuf_size=ibs;
 374                         }
 375                 if (ctx->obuf != p2)
 376                         {
 377                         OPENSSL_free(ctx->obuf);
 378                         ctx->obuf=p2;
 379                         ctx->obuf_off=0;
 380                         ctx->obuf_len=0;
 381                         ctx->obuf_size=obs;
 382                         }
 383                 break;
 384         case BIO_C_DO_STATE_MACHINE:
 385                 if (b->next_bio == NULL) return(0);
 386                 BIO_clear_retry_flags(b);
 387                 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 388                 BIO_copy_next_retry(b);
 389                 break;
 390
 391         case BIO_CTRL_FLUSH:
 392                 if (b->next_bio == NULL) return(0);
 393                 if (ctx->obuf_len <= 0)
 394                         {
 395                         ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 396                         break;
 397                         }
 398
 399                 for (;;)
 400                         {
 401                         BIO_clear_retry_flags(b);
 402                         if (ctx->obuf_len > ctx->obuf_off)
 403                                 {
 404                                 r=BIO_write(b->next_bio,
 405                                         &(ctx->obuf[ctx->obuf_off]),
 406                                         ctx->obuf_len-ctx->obuf_off);
 407 #if 0
 408 fprintf(stderr,"FLUSH [%3d] %3d -> %3d\n",ctx->obuf_off,ctx->obuf_len-ctx->obuf_off,r);
 409 #endif
 410                                 BIO_copy_next_retry(b);
 411                                 if (r <= 0) return((long)r);
 412                                 ctx->obuf_off+=r;
 413                                 }
 414                         else
 415                                 {
 416                                 ctx->obuf_len=0;
 417                                 ctx->obuf_off=0;
 418                                 ret=1;
 419                                 break;
 420                                 }
 421                         }
 422                 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 423                 break;
 424         case BIO_CTRL_DUP:
 425                 dbio=(BIO *)ptr;
 426                 if (    !BIO_set_read_buffer_size(dbio,ctx->ibuf_size) ||
 427                         !BIO_set_write_buffer_size(dbio,ctx->obuf_size))
 428                         ret=0;
 429                 break;
 430         default:
 431                 if (b->next_bio == NULL) return(0);
 432                 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 433                 break;
 434                 }
 435         return(ret);
 436 malloc_error:
 437         BIOerr(BIO_F_BUFFER_CTRL,ERR_R_MALLOC_FAILURE);
 438         return(0);
 439         }
 440
 441 static long buffer_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
 442         {
 443         long ret=1;
 444
 445         if (b->next_bio == NULL) return(0);
 446         switch (cmd)
 447                 {
 448         default:
 449                 ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
 450                 break;
 451                 }
 452         return(ret);
 453         }
 454
 455 static int buffer_gets(BIO *b, char *buf, int size)
 456         {
 457         BIO_F_BUFFER_CTX *ctx;
 458         int num=0,i,flag;
 459         char *p;
 460
 461         ctx=(BIO_F_BUFFER_CTX *)b->ptr;
 462         size--; /* reserve space for a '\0' */
 463         BIO_clear_retry_flags(b);
 464
 465         for (;;)
 466                 {
 467                 if (ctx->ibuf_len > 0)
 468                         {
 469                         p= &(ctx->ibuf[ctx->ibuf_off]);
 470                         flag=0;
 471                         for (i=0; (i<ctx->ibuf_len) && (i<size); i++)
 472                                 {
 473                                 *(buf++)=p[i];
 474                                 if (p[i] == '\n')
 475                                         {
 476                                         flag=1;
 477                                         i++;
 478                                         break;
 479                                         }
 480                                 }
 481                         num+=i;
 482                         size-=i;
 483                         ctx->ibuf_len-=i;
 484                         ctx->ibuf_off+=i;
 485                         if (flag || size == 0)
 486                                 {
 487                                 *buf='\0';
 488                                 return(num);
 489                                 }
 490                         }
 491                 else    /* read another chunk */
 492                         {
 493                         i=BIO_read(b->next_bio,ctx->ibuf,ctx->ibuf_size);
 494                         if (i <= 0)
 495                                 {
 496                                 BIO_copy_next_retry(b);
 497                                 *buf='\0';
 498                                 if (i < 0) return((num > 0)?num:i);
 499                                 if (i == 0) return(num);
 500                                 }
 501                         ctx->ibuf_len=i;
 502                         ctx->ibuf_off=0;
 503                         }
 504                 }
 505         }
 506
 507 static int buffer_puts(BIO *b, const char *str)
 508         {
 509         return(buffer_write(b,str,strlen(str)));
 510         }
 511