crypto/bio/bf_buff.c

   1 /* crypto/bio/bf_buff.c */
   2 /* Copyright (C) 1995-1997 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 "bio.h"
  63 #include "evp.h"
  64
  65 #ifndef NOPROTO
  66 static int buffer_write(BIO *h,char *buf,int num);
  67 static int buffer_read(BIO *h,char *buf,int size);
  68 static int buffer_puts(BIO *h,char *str);
  69 static int buffer_gets(BIO *h,char *str,int size);
  70 static long buffer_ctrl(BIO *h,int cmd,long arg1,char *arg2);
  71 static int buffer_new(BIO *h);
  72 static int buffer_free(BIO *data);
  73 #else
  74 static int buffer_write();
  75 static int buffer_read();
  76 static int buffer_puts();
  77 static int buffer_gets();
  78 static long buffer_ctrl();
  79 static int buffer_new();
  80 static int buffer_free();
  81 #endif
  82
  83 #define DEFAULT_BUFFER_SIZE     1024
  84
  85 static BIO_METHOD methods_buffer=
  86         {
  87         BIO_TYPE_BUFFER,"buffer",
  88         buffer_write,
  89         buffer_read,
  90         buffer_puts,
  91         buffer_gets,
  92         buffer_ctrl,
  93         buffer_new,
  94         buffer_free,
  95         };
  96
  97 BIO_METHOD *BIO_f_buffer()
  98         {
  99         return(&methods_buffer);
 100         }
 101
 102 static int buffer_new(bi)
 103 BIO *bi;
 104         {
 105         BIO_F_BUFFER_CTX *ctx;
 106
 107         ctx=(BIO_F_BUFFER_CTX *)Malloc(sizeof(BIO_F_BUFFER_CTX));
 108         if (ctx == NULL) return(0);
 109         ctx->ibuf=(char *)Malloc(DEFAULT_BUFFER_SIZE);
 110         if (ctx->ibuf == NULL) { Free(ctx); return(0); }
 111         ctx->obuf=(char *)Malloc(DEFAULT_BUFFER_SIZE);
 112         if (ctx->obuf == NULL) { Free(ctx->ibuf); Free(ctx); return(0); }
 113         ctx->ibuf_size=DEFAULT_BUFFER_SIZE;
 114         ctx->obuf_size=DEFAULT_BUFFER_SIZE;
 115         ctx->ibuf_len=0;
 116         ctx->ibuf_off=0;
 117         ctx->obuf_len=0;
 118         ctx->obuf_off=0;
 119
 120         bi->init=1;
 121         bi->ptr=(char *)ctx;
 122         bi->flags=0;
 123         return(1);
 124         }
 125
 126 static int buffer_free(a)
 127 BIO *a;
 128         {
 129         BIO_F_BUFFER_CTX *b;
 130
 131         if (a == NULL) return(0);
 132         b=(BIO_F_BUFFER_CTX *)a->ptr;
 133         if (b->ibuf != NULL) Free(b->ibuf);
 134         if (b->obuf != NULL) Free(b->obuf);
 135         Free(a->ptr);
 136         a->ptr=NULL;
 137         a->init=0;
 138         a->flags=0;
 139         return(1);
 140         }
 141
 142 static int buffer_read(b,out,outl)
 143 BIO *b;
 144 char *out;
 145 int outl;
 146         {
 147         int i,num=0;
 148         BIO_F_BUFFER_CTX *ctx;
 149
 150         if (out == NULL) return(0);
 151         ctx=(BIO_F_BUFFER_CTX *)b->ptr;
 152
 153         if ((ctx == NULL) || (b->next_bio == NULL)) return(0);
 154         num=0;
 155         BIO_clear_retry_flags(b);
 156
 157 start:
 158         i=ctx->ibuf_len;
 159         /* If there is stuff left over, grab it */
 160         if (i != 0)
 161                 {
 162                 if (i > outl) i=outl;
 163                 memcpy(out,&(ctx->ibuf[ctx->ibuf_off]),i);
 164                 ctx->ibuf_off+=i;
 165                 ctx->ibuf_len-=i;
 166                 num+=i;
 167                 if (outl == i)  return(num);
 168                 outl-=i;
 169                 out+=i;
 170                 }
 171
 172         /* We may have done a partial read. try to do more.
 173          * We have nothing in the buffer.
 174          * If we get an error and have read some data, just return it
 175          * and let them retry to get the error again.
 176          * copy direct to parent address space */
 177         if (outl > ctx->ibuf_size)
 178                 {
 179                 for (;;)
 180                         {
 181                         i=BIO_read(b->next_bio,out,outl);
 182                         if (i <= 0)
 183                                 {
 184                                 BIO_copy_next_retry(b);
 185                                 if (i < 0) return((num > 0)?num:i);
 186                                 if (i == 0) return(num);
 187                                 }
 188                         num+=i;
 189                         if (outl == i) 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                 {
 200                 BIO_copy_next_retry(b);
 201                 if (i < 0) return((num > 0)?num:i);
 202                 if (i == 0) return(num);
 203                 }
 204         ctx->ibuf_off=0;
 205         ctx->ibuf_len=i;
 206
 207         /* Lets re-read using ourselves :-) */
 208         goto start;
 209         }
 210
 211 static int buffer_write(b,in,inl)
 212 BIO *b;
 213 char *in;
 214 int inl;
 215         {
 216         int i,num=0;
 217         BIO_F_BUFFER_CTX *ctx;
 218
 219         if ((in == NULL) || (inl <= 0)) return(0);
 220         ctx=(BIO_F_BUFFER_CTX *)b->ptr;
 221         if ((ctx == NULL) || (b->next_bio == NULL)) 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                 {
 229                 memcpy(&(ctx->obuf[ctx->obuf_len]),in,inl);
 230                 ctx->obuf_len+=inl;
 231                 return(num+inl);
 232                 }
 233         /* else */
 234         /* stuff already in buffer, so add to it first, then flush */
 235         if (ctx->obuf_len != 0)
 236                 {
 237                 if (i > 0) /* lets fill it up if we can */
 238                         {
 239                         memcpy(&(ctx->obuf[ctx->obuf_len]),in,i);
 240                         in+=i;
 241                         inl-=i;
 242                         num+=i;
 243                         ctx->obuf_len+=i;
 244                         }
 245                 /* we now have a full buffer needing flushing */
 246                 for (;;)
 247                         {
 248                         i=BIO_write(b->next_bio,&(ctx->obuf[ctx->obuf_off]),
 249                                 ctx->obuf_len);
 250                         if (i <= 0)
 251                                 {
 252                                 BIO_copy_next_retry(b);
 253
 254                                 if (i < 0) return((num > 0)?num:i);
 255                                 if (i == 0) return(num);
 256                                 }
 257                         ctx->obuf_off+=i;
 258                         ctx->obuf_len-=i;
 259                         if (ctx->obuf_len == 0) break;
 260                         }
 261                 }
 262         /* we only get here if the buffer has been flushed and we
 263          * still have stuff to write */
 264         ctx->obuf_off=0;
 265
 266         /* we now have inl bytes to write */
 267         while (inl >= ctx->obuf_size)
 268                 {
 269                 i=BIO_write(b->next_bio,in,inl);
 270                 if (i <= 0)
 271                         {
 272                         BIO_copy_next_retry(b);
 273                         if (i < 0) return((num > 0)?num:i);
 274                         if (i == 0) return(num);
 275                         }
 276                 num+=i;
 277                 in+=i;
 278                 inl-=i;
 279                 if (inl == 0) return(num);
 280                 }
 281
 282         /* copy the rest into the buffer since we have only a small
 283          * amount left */
 284         goto start;
 285         }
 286
 287 static long buffer_ctrl(b,cmd,num,ptr)
 288 BIO *b;
 289 int cmd;
 290 long num;
 291 char *ptr;
 292         {
 293         BIO *dbio;
 294         BIO_F_BUFFER_CTX *ctx;
 295         long ret=1;
 296         char *p1,*p2;
 297         int r,i,*ip;
 298         int ibs,obs;
 299
 300         ctx=(BIO_F_BUFFER_CTX *)b->ptr;
 301
 302         switch (cmd)
 303                 {
 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                 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 310                 break;
 311         case BIO_CTRL_INFO:
 312                 ret=(long)ctx->obuf_len;
 313                 break;
 314         case BIO_C_GET_BUFF_NUM_LINES:
 315                 ret=0;
 316                 p1=ctx->ibuf;
 317                 for (i=ctx->ibuf_off; i<ctx->ibuf_len; i++)
 318                         {
 319                         if (p1[i] == '\n') ret++;
 320                         }
 321                 break;
 322         case BIO_CTRL_WPENDING:
 323                 ret=(long)ctx->obuf_len;
 324                 if (ret == 0)
 325                         ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 326                 break;
 327         case BIO_CTRL_PENDING:
 328                 ret=(long)ctx->ibuf_len;
 329                 if (ret == 0)
 330                         ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 331                 break;
 332         case BIO_C_SET_BUFF_SIZE:
 333                 if (ptr != NULL)
 334                         {
 335                         ip=(int *)ptr;
 336                         if (*ip == 0)
 337                                 {
 338                                 ibs=(int)num;
 339                                 obs=ctx->obuf_size;
 340                                 }
 341                         else /* if (*ip == 1) */
 342                                 {
 343                                 ibs=ctx->ibuf_size;
 344                                 obs=(int)num;
 345                                 }
 346                         }
 347                 else
 348                         {
 349                         ibs=(int)num;
 350                         obs=(int)num;
 351                         }
 352                 p1=ctx->ibuf;
 353                 p2=ctx->obuf;
 354                 if ((ibs > DEFAULT_BUFFER_SIZE) && (ibs != ctx->ibuf_size))
 355                         {
 356                         p1=(char *)Malloc((int)num);
 357                         if (p1 == NULL) { ret=0; break; }
 358                         }
 359                 if ((obs > DEFAULT_BUFFER_SIZE) && (obs != ctx->obuf_size))
 360                         {
 361                         p2=(char *)Malloc((int)num);
 362                         if (p2 == NULL)
 363                                 {
 364                                 ret=0;
 365                                 if (p1 != ctx->ibuf) Free(p1);
 366                                 break;
 367                                 }
 368                         }
 369                 if (ctx->ibuf != p1)
 370                         {
 371                         Free(ctx->ibuf);
 372                         ctx->ibuf=p1;
 373                         ctx->ibuf_off=0;
 374                         ctx->ibuf_len=0;
 375                         ctx->ibuf_size=ibs;
 376                         }
 377                 if (ctx->obuf != p2)
 378                         {
 379                         Free(ctx->obuf);
 380                         ctx->obuf=p2;
 381                         ctx->obuf_off=0;
 382                         ctx->obuf_len=0;
 383                         ctx->obuf_size=obs;
 384                         }
 385                 break;
 386         case BIO_C_DO_STATE_MACHINE:
 387                 BIO_clear_retry_flags(b);
 388                 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 389                 BIO_copy_next_retry(b);
 390                 break;
 391
 392         case BIO_CTRL_FLUSH:
 393                 if (ctx->obuf_len <= 0)
 394                         break;
 395
 396                 for (;;)
 397                         {
 398                         BIO_clear_retry_flags(b);
 399                         if (ctx->obuf_len > ctx->obuf_off)
 400                                 {
 401                                 r=BIO_write(b->next_bio,
 402                                         &(ctx->obuf[ctx->obuf_off]),
 403                                         ctx->obuf_len-ctx->obuf_off);
 404 #if 0
 405 fprintf(stderr,"FLUSH [%3d] %3d -> %3d\n",ctx->obuf_off,ctx->obuf_len-ctx->obuf_off,r);
 406 #endif
 407                                 BIO_copy_next_retry(b);
 408                                 if (r <= 0) return((long)r);
 409                                 ctx->obuf_off+=r;
 410                                 }
 411                         else
 412                                 {
 413                                 ctx->obuf_len=0;
 414                                 ctx->obuf_off=0;
 415                                 ret=1;
 416                                 break;
 417                                 }
 418                         }
 419                 break;
 420         case BIO_CTRL_DUP:
 421                 dbio=(BIO *)ptr;
 422                 if (    !BIO_set_read_buffer_size(dbio,ctx->ibuf_size) ||
 423                         !BIO_set_write_buffer_size(dbio,ctx->obuf_size))
 424                         ret=0;
 425                 break;
 426         default:
 427                 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 428                 break;
 429                 }
 430         return(ret);
 431         }
 432
 433 static int buffer_gets(b,buf,size)
 434 BIO *b;
 435 char *buf;
 436 int size;
 437         {
 438         BIO_F_BUFFER_CTX *ctx;
 439         int num=0,i;
 440         char *p;
 441
 442         ctx=(BIO_F_BUFFER_CTX *)b->ptr;
 443         size--;
 444         BIO_clear_retry_flags(b);
 445
 446         for (;;)
 447                 {
 448                 if (ctx->ibuf_len != 0)
 449                         {
 450                         p= &(ctx->ibuf[ctx->ibuf_off]);
 451                         for (i=0; (i<ctx->ibuf_len) && (i<(size-1)); i++)
 452                                 {
 453                                 *(buf++)=p[i];
 454                                 if (p[i] == '\n') break;
 455                                 }
 456                         num+=i;
 457                         size-=i;
 458                         ctx->ibuf_len-=i;
 459                         ctx->ibuf_off+=i;
 460                         if (p[i] == '\n')
 461                                 {
 462                                 buf[i+1]='\0';
 463                                 ctx->ibuf_len--;
 464                                 ctx->ibuf_off++;
 465                                 return(num);
 466                                 }
 467                         }
 468                 else    /* read another chunk */
 469                         {
 470                         i=BIO_read(b->next_bio,ctx->ibuf,ctx->ibuf_size);
 471                         if (i <= 0)
 472                                 {
 473                                 BIO_copy_next_retry(b);
 474                                 if (i < 0) return((num > 0)?num:i);
 475                                 if (i == 0) return(num);
 476                                 }
 477                         ctx->ibuf_len=i;
 478                         ctx->ibuf_off=0;
 479                         }
 480                 }
 481         }
 482
 483 static int buffer_puts(b,str)
 484 BIO *b;
 485 char *str;
 486         {
 487         return(BIO_write(b,str,strlen(str)));
 488         }
 489