crypto/openssl-0.9/crypto/bio/bio_lib.c

   1 /* crypto/bio/bio_lib.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 <openssl/crypto.h>
  62 #include "cryptlib.h"
  63 #include <openssl/bio.h>
  64 #include <openssl/stack.h>
  65
  66 BIO *BIO_new(BIO_METHOD *method)
  67         {
  68         BIO *ret=NULL;
  69
  70         ret=(BIO *)OPENSSL_malloc(sizeof(BIO));
  71         if (ret == NULL)
  72                 {
  73                 BIOerr(BIO_F_BIO_NEW,ERR_R_MALLOC_FAILURE);
  74                 return(NULL);
  75                 }
  76         if (!BIO_set(ret,method))
  77                 {
  78                 OPENSSL_free(ret);
  79                 ret=NULL;
  80                 }
  81         return(ret);
  82         }
  83
  84 int BIO_set(BIO *bio, BIO_METHOD *method)
  85         {
  86         bio->method=method;
  87         bio->callback=NULL;
  88         bio->cb_arg=NULL;
  89         bio->init=0;
  90         bio->shutdown=1;
  91         bio->flags=0;
  92         bio->retry_reason=0;
  93         bio->num=0;
  94         bio->ptr=NULL;
  95         bio->prev_bio=NULL;
  96         bio->next_bio=NULL;
  97         bio->references=1;
  98         bio->num_read=0L;
  99         bio->num_write=0L;
 100         CRYPTO_new_ex_data(CRYPTO_EX_INDEX_BIO, bio, &bio->ex_data);
 101         if (method->create != NULL)
 102                 if (!method->create(bio))
 103                         {
 104                         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_BIO, bio,
 105                                         &bio->ex_data);
 106                         return(0);
 107                         }
 108         return(1);
 109         }
 110
 111 int BIO_free(BIO *a)
 112         {
 113         int ret=0,i;
 114
 115         if (a == NULL) return(0);
 116
 117         i=CRYPTO_add(&a->references,-1,CRYPTO_LOCK_BIO);
 118 #ifdef REF_PRINT
 119         REF_PRINT("BIO",a);
 120 #endif
 121         if (i > 0) return(1);
 122 #ifdef REF_CHECK
 123         if (i < 0)
 124                 {
 125                 fprintf(stderr,"BIO_free, bad reference count\n");
 126                 abort();
 127                 }
 128 #endif
 129         if ((a->callback != NULL) &&
 130                 ((i=(int)a->callback(a,BIO_CB_FREE,NULL,0,0L,1L)) <= 0))
 131                         return(i);
 132
 133         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_BIO, a, &a->ex_data);
 134
 135         if ((a->method == NULL) || (a->method->destroy == NULL)) return(1);
 136         ret=a->method->destroy(a);
 137         OPENSSL_free(a);
 138         return(1);
 139         }
 140
 141 void BIO_vfree(BIO *a)
 142     { BIO_free(a); }
 143
 144 void BIO_clear_flags(BIO *b, int flags)
 145         {
 146         b->flags &= ~flags;
 147         }
 148
 149 int     BIO_test_flags(const BIO *b, int flags)
 150         {
 151         return (b->flags & flags);
 152         }
 153
 154 void    BIO_set_flags(BIO *b, int flags)
 155         {
 156         b->flags |= flags;
 157         }
 158
 159 long (*BIO_get_callback(const BIO *b))(struct bio_st *,int,const char *,int, long,long)
 160         {
 161         return b->callback;
 162         }
 163
 164 void BIO_set_callback(BIO *b, long (*cb)(struct bio_st *,int,const char *,int, long,long))
 165         {
 166         b->callback = cb;
 167         }
 168
 169 void BIO_set_callback_arg(BIO *b, char *arg)
 170         {
 171         b->cb_arg = arg;
 172         }
 173
 174 char * BIO_get_callback_arg(const BIO *b)
 175         {
 176         return b->cb_arg;
 177         }
 178
 179 const char * BIO_method_name(const BIO *b)
 180         {
 181         return b->method->name;
 182         }
 183
 184 int BIO_method_type(const BIO *b)
 185         {
 186         return b->method->type;
 187         }
 188
 189
 190 int BIO_read(BIO *b, void *out, int outl)
 191         {
 192         int i;
 193         long (*cb)(BIO *,int,const char *,int,long,long);
 194
 195         if ((b == NULL) || (b->method == NULL) || (b->method->bread == NULL))
 196                 {
 197                 BIOerr(BIO_F_BIO_READ,BIO_R_UNSUPPORTED_METHOD);
 198                 return(-2);
 199                 }
 200
 201         cb=b->callback;
 202         if ((cb != NULL) &&
 203                 ((i=(int)cb(b,BIO_CB_READ,out,outl,0L,1L)) <= 0))
 204                         return(i);
 205
 206         if (!b->init)
 207                 {
 208                 BIOerr(BIO_F_BIO_READ,BIO_R_UNINITIALIZED);
 209                 return(-2);
 210                 }
 211
 212         i=b->method->bread(b,out,outl);
 213
 214         if (i > 0) b->num_read+=(unsigned long)i;
 215
 216         if (cb != NULL)
 217                 i=(int)cb(b,BIO_CB_READ|BIO_CB_RETURN,out,outl,
 218                         0L,(long)i);
 219         return(i);
 220         }
 221
 222 int BIO_write(BIO *b, const void *in, int inl)
 223         {
 224         int i;
 225         long (*cb)(BIO *,int,const char *,int,long,long);
 226
 227         if (b == NULL)
 228                 return(0);
 229
 230         cb=b->callback;
 231         if ((b->method == NULL) || (b->method->bwrite == NULL))
 232                 {
 233                 BIOerr(BIO_F_BIO_WRITE,BIO_R_UNSUPPORTED_METHOD);
 234                 return(-2);
 235                 }
 236
 237         if ((cb != NULL) &&
 238                 ((i=(int)cb(b,BIO_CB_WRITE,in,inl,0L,1L)) <= 0))
 239                         return(i);
 240
 241         if (!b->init)
 242                 {
 243                 BIOerr(BIO_F_BIO_WRITE,BIO_R_UNINITIALIZED);
 244                 return(-2);
 245                 }
 246
 247         i=b->method->bwrite(b,in,inl);
 248
 249         if (i > 0) b->num_write+=(unsigned long)i;
 250
 251         if (cb != NULL)
 252                 i=(int)cb(b,BIO_CB_WRITE|BIO_CB_RETURN,in,inl,
 253                         0L,(long)i);
 254         return(i);
 255         }
 256
 257 int BIO_puts(BIO *b, const char *in)
 258         {
 259         int i;
 260         long (*cb)(BIO *,int,const char *,int,long,long);
 261
 262         if ((b == NULL) || (b->method == NULL) || (b->method->bputs == NULL))
 263                 {
 264                 BIOerr(BIO_F_BIO_PUTS,BIO_R_UNSUPPORTED_METHOD);
 265                 return(-2);
 266                 }
 267
 268         cb=b->callback;
 269
 270         if ((cb != NULL) &&
 271                 ((i=(int)cb(b,BIO_CB_PUTS,in,0,0L,1L)) <= 0))
 272                         return(i);
 273
 274         if (!b->init)
 275                 {
 276                 BIOerr(BIO_F_BIO_PUTS,BIO_R_UNINITIALIZED);
 277                 return(-2);
 278                 }
 279
 280         i=b->method->bputs(b,in);
 281
 282         if (i > 0) b->num_write+=(unsigned long)i;
 283
 284         if (cb != NULL)
 285                 i=(int)cb(b,BIO_CB_PUTS|BIO_CB_RETURN,in,0,
 286                         0L,(long)i);
 287         return(i);
 288         }
 289
 290 int BIO_gets(BIO *b, char *in, int inl)
 291         {
 292         int i;
 293         long (*cb)(BIO *,int,const char *,int,long,long);
 294
 295         if ((b == NULL) || (b->method == NULL) || (b->method->bgets == NULL))
 296                 {
 297                 BIOerr(BIO_F_BIO_GETS,BIO_R_UNSUPPORTED_METHOD);
 298                 return(-2);
 299                 }
 300
 301         cb=b->callback;
 302
 303         if ((cb != NULL) &&
 304                 ((i=(int)cb(b,BIO_CB_GETS,in,inl,0L,1L)) <= 0))
 305                         return(i);
 306
 307         if (!b->init)
 308                 {
 309                 BIOerr(BIO_F_BIO_GETS,BIO_R_UNINITIALIZED);
 310                 return(-2);
 311                 }
 312
 313         i=b->method->bgets(b,in,inl);
 314
 315         if (cb != NULL)
 316                 i=(int)cb(b,BIO_CB_GETS|BIO_CB_RETURN,in,inl,
 317                         0L,(long)i);
 318         return(i);
 319         }
 320
 321 int BIO_indent(BIO *b,int indent,int max)
 322         {
 323         if(indent < 0)
 324                 indent=0;
 325         if(indent > max)
 326                 indent=max;
 327         while(indent--)
 328                 if(BIO_puts(b," ") != 1)
 329                         return 0;
 330         return 1;
 331         }
 332
 333 long BIO_int_ctrl(BIO *b, int cmd, long larg, int iarg)
 334         {
 335         int i;
 336
 337         i=iarg;
 338         return(BIO_ctrl(b,cmd,larg,(char *)&i));
 339         }
 340
 341 char *BIO_ptr_ctrl(BIO *b, int cmd, long larg)
 342         {
 343         char *p=NULL;
 344
 345         if (BIO_ctrl(b,cmd,larg,(char *)&p) <= 0)
 346                 return(NULL);
 347         else
 348                 return(p);
 349         }
 350
 351 long BIO_ctrl(BIO *b, int cmd, long larg, void *parg)
 352         {
 353         long ret;
 354         long (*cb)(BIO *,int,const char *,int,long,long);
 355
 356         if (b == NULL) return(0);
 357
 358         if ((b->method == NULL) || (b->method->ctrl == NULL))
 359                 {
 360                 BIOerr(BIO_F_BIO_CTRL,BIO_R_UNSUPPORTED_METHOD);
 361                 return(-2);
 362                 }
 363
 364         cb=b->callback;
 365
 366         if ((cb != NULL) &&
 367                 ((ret=cb(b,BIO_CB_CTRL,parg,cmd,larg,1L)) <= 0))
 368                 return(ret);
 369
 370         ret=b->method->ctrl(b,cmd,larg,parg);
 371
 372         if (cb != NULL)
 373                 ret=cb(b,BIO_CB_CTRL|BIO_CB_RETURN,parg,cmd,
 374                         larg,ret);
 375         return(ret);
 376         }
 377
 378 long BIO_callback_ctrl(BIO *b, int cmd, void (*fp)(struct bio_st *, int, const char *, int, long, long))
 379         {
 380         long ret;
 381         long (*cb)(BIO *,int,const char *,int,long,long);
 382
 383         if (b == NULL) return(0);
 384
 385         if ((b->method == NULL) || (b->method->callback_ctrl == NULL))
 386                 {
 387                 BIOerr(BIO_F_BIO_CALLBACK_CTRL,BIO_R_UNSUPPORTED_METHOD);
 388                 return(-2);
 389                 }
 390
 391         cb=b->callback;
 392
 393         if ((cb != NULL) &&
 394                 ((ret=cb(b,BIO_CB_CTRL,(void *)&fp,cmd,0,1L)) <= 0))
 395                 return(ret);
 396
 397         ret=b->method->callback_ctrl(b,cmd,fp);
 398
 399         if (cb != NULL)
 400                 ret=cb(b,BIO_CB_CTRL|BIO_CB_RETURN,(void *)&fp,cmd,
 401                         0,ret);
 402         return(ret);
 403         }
 404
 405 /* It is unfortunate to duplicate in functions what the BIO_(w)pending macros
 406  * do; but those macros have inappropriate return type, and for interfacing
 407  * from other programming languages, C macros aren't much of a help anyway. */
 408 size_t BIO_ctrl_pending(BIO *bio)
 409         {
 410         return BIO_ctrl(bio, BIO_CTRL_PENDING, 0, NULL);
 411         }
 412
 413 size_t BIO_ctrl_wpending(BIO *bio)
 414         {
 415         return BIO_ctrl(bio, BIO_CTRL_WPENDING, 0, NULL);
 416         }
 417
 418
 419 /* put the 'bio' on the end of b's list of operators */
 420 BIO *BIO_push(BIO *b, BIO *bio)
 421         {
 422         BIO *lb;
 423
 424         if (b == NULL) return(bio);
 425         lb=b;
 426         while (lb->next_bio != NULL)
 427                 lb=lb->next_bio;
 428         lb->next_bio=bio;
 429         if (bio != NULL)
 430                 bio->prev_bio=lb;
 431         /* called to do internal processing */
 432         BIO_ctrl(b,BIO_CTRL_PUSH,0,NULL);
 433         return(b);
 434         }
 435
 436 /* Remove the first and return the rest */
 437 BIO *BIO_pop(BIO *b)
 438         {
 439         BIO *ret;
 440
 441         if (b == NULL) return(NULL);
 442         ret=b->next_bio;
 443
 444         BIO_ctrl(b,BIO_CTRL_POP,0,NULL);
 445
 446         if (b->prev_bio != NULL)
 447                 b->prev_bio->next_bio=b->next_bio;
 448         if (b->next_bio != NULL)
 449                 b->next_bio->prev_bio=b->prev_bio;
 450
 451         b->next_bio=NULL;
 452         b->prev_bio=NULL;
 453         return(ret);
 454         }
 455
 456 BIO *BIO_get_retry_BIO(BIO *bio, int *reason)
 457         {
 458         BIO *b,*last;
 459
 460         b=last=bio;
 461         for (;;)
 462                 {
 463                 if (!BIO_should_retry(b)) break;
 464                 last=b;
 465                 b=b->next_bio;
 466                 if (b == NULL) break;
 467                 }
 468         if (reason != NULL) *reason=last->retry_reason;
 469         return(last);
 470         }
 471
 472 int BIO_get_retry_reason(BIO *bio)
 473         {
 474         return(bio->retry_reason);
 475         }
 476
 477 BIO *BIO_find_type(BIO *bio, int type)
 478         {
 479         int mt,mask;
 480
 481         if(!bio) return NULL;
 482         mask=type&0xff;
 483         do      {
 484                 if (bio->method != NULL)
 485                         {
 486                         mt=bio->method->type;
 487
 488                         if (!mask)
 489                                 {
 490                                 if (mt & type) return(bio);
 491                                 }
 492                         else if (mt == type)
 493                                 return(bio);
 494                         }
 495                 bio=bio->next_bio;
 496                 } while (bio != NULL);
 497         return(NULL);
 498         }
 499
 500 BIO *BIO_next(BIO *b)
 501         {
 502         if(!b) return NULL;
 503         return b->next_bio;
 504         }
 505
 506 void BIO_free_all(BIO *bio)
 507         {
 508         BIO *b;
 509         int ref;
 510
 511         while (bio != NULL)
 512                 {
 513                 b=bio;
 514                 ref=b->references;
 515                 bio=bio->next_bio;
 516                 BIO_free(b);
 517                 /* Since ref count > 1, don't free anyone else. */
 518                 if (ref > 1) break;
 519                 }
 520         }
 521
 522 BIO *BIO_dup_chain(BIO *in)
 523         {
 524         BIO *ret=NULL,*eoc=NULL,*bio,*new;
 525
 526         for (bio=in; bio != NULL; bio=bio->next_bio)
 527                 {
 528                 if ((new=BIO_new(bio->method)) == NULL) goto err;
 529                 new->callback=bio->callback;
 530                 new->cb_arg=bio->cb_arg;
 531                 new->init=bio->init;
 532                 new->shutdown=bio->shutdown;
 533                 new->flags=bio->flags;
 534
 535                 /* This will let SSL_s_sock() work with stdin/stdout */
 536                 new->num=bio->num;
 537
 538                 if (!BIO_dup_state(bio,(char *)new))
 539                         {
 540                         BIO_free(new);
 541                         goto err;
 542                         }
 543
 544                 /* copy app data */
 545                 if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_BIO, &new->ex_data,
 546                                         &bio->ex_data))
 547                         goto err;
 548
 549                 if (ret == NULL)
 550                         {
 551                         eoc=new;
 552                         ret=eoc;
 553                         }
 554                 else
 555                         {
 556                         BIO_push(eoc,new);
 557                         eoc=new;
 558                         }
 559                 }
 560         return(ret);
 561 err:
 562         if (ret != NULL)
 563                 BIO_free(ret);
 564         return(NULL);
 565         }
 566
 567 void BIO_copy_next_retry(BIO *b)
 568         {
 569         BIO_set_flags(b,BIO_get_retry_flags(b->next_bio));
 570         b->retry_reason=b->next_bio->retry_reason;
 571         }
 572
 573 int BIO_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
 574              CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
 575         {
 576         return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_BIO, argl, argp,
 577                                 new_func, dup_func, free_func);
 578         }
 579
 580 int BIO_set_ex_data(BIO *bio, int idx, void *data)
 581         {
 582         return(CRYPTO_set_ex_data(&(bio->ex_data),idx,data));
 583         }
 584
 585 void *BIO_get_ex_data(BIO *bio, int idx)
 586         {
 587         return(CRYPTO_get_ex_data(&(bio->ex_data),idx));
 588         }
 589
 590 unsigned long BIO_number_read(BIO *bio)
 591 {
 592         if(bio) return bio->num_read;
 593         return 0;
 594 }
 595
 596 unsigned long BIO_number_written(BIO *bio)
 597 {
 598         if(bio) return bio->num_write;
 599         return 0;
 600 }
 601
 602 IMPLEMENT_STACK_OF(BIO)