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 static STACK *bio_meth=NULL;
  67 static int bio_meth_num=0;
  68
  69 BIO *BIO_new(BIO_METHOD *method)
  70         {
  71         BIO *ret=NULL;
  72
  73         ret=(BIO *)Malloc(sizeof(BIO));
  74         if (ret == NULL)
  75                 {
  76                 BIOerr(BIO_F_BIO_NEW,ERR_R_MALLOC_FAILURE);
  77                 return(NULL);
  78                 }
  79         if (!BIO_set(ret,method))
  80                 {
  81                 Free(ret);
  82                 ret=NULL;
  83                 }
  84         return(ret);
  85         }
  86
  87 int BIO_set(BIO *bio, BIO_METHOD *method)
  88         {
  89         bio->method=method;
  90         bio->callback=NULL;
  91         bio->cb_arg=NULL;
  92         bio->init=0;
  93         bio->shutdown=1;
  94         bio->flags=0;
  95         bio->retry_reason=0;
  96         bio->num=0;
  97         bio->ptr=NULL;
  98         bio->prev_bio=NULL;
  99         bio->next_bio=NULL;
 100         bio->references=1;
 101         bio->num_read=0L;
 102         bio->num_write=0L;
 103         CRYPTO_new_ex_data(bio_meth,(char *)bio,&bio->ex_data);
 104         if (method->create != NULL)
 105                 if (!method->create(bio))
 106                         return(0);
 107         return(1);
 108         }
 109
 110 int BIO_free(BIO *a)
 111         {
 112         int ret=0,i;
 113
 114         if (a == NULL) return(0);
 115
 116         i=CRYPTO_add(&a->references,-1,CRYPTO_LOCK_BIO);
 117 #ifdef REF_PRINT
 118         REF_PRINT("BIO",a);
 119 #endif
 120         if (i > 0) return(1);
 121 #ifdef REF_CHECK
 122         if (i < 0)
 123                 {
 124                 fprintf(stderr,"BIO_free, bad reference count\n");
 125                 abort();
 126                 }
 127 #endif
 128         if ((a->callback != NULL) &&
 129                 ((i=(int)a->callback(a,BIO_CB_FREE,NULL,0,0L,1L)) <= 0))
 130                         return(i);
 131
 132         CRYPTO_free_ex_data(bio_meth,(char *)a,&a->ex_data);
 133
 134         if ((a->method == NULL) || (a->method->destroy == NULL)) return(1);
 135         ret=a->method->destroy(a);
 136         Free(a);
 137         return(1);
 138         }
 139
 140 int BIO_read(BIO *b, void *out, int outl)
 141         {
 142         int i;
 143         long (*cb)();
 144
 145         if ((b == NULL) || (b->method == NULL) || (b->method->bread == NULL))
 146                 {
 147                 BIOerr(BIO_F_BIO_READ,BIO_R_UNSUPPORTED_METHOD);
 148                 return(-2);
 149                 }
 150
 151         cb=b->callback;
 152         if ((cb != NULL) &&
 153                 ((i=(int)cb(b,BIO_CB_READ,out,outl,0L,1L)) <= 0))
 154                         return(i);
 155
 156         if (!b->init)
 157                 {
 158                 BIOerr(BIO_F_BIO_READ,BIO_R_UNINITIALIZED);
 159                 return(-2);
 160                 }
 161
 162         i=b->method->bread(b,out,outl);
 163
 164         if (i > 0) b->num_read+=(unsigned long)i;
 165
 166         if (cb != NULL)
 167                 i=(int)cb(b,BIO_CB_READ|BIO_CB_RETURN,out,outl,
 168                         0L,(long)i);
 169         return(i);
 170         }
 171
 172 int BIO_write(BIO *b, const char *in, int inl)
 173         {
 174         int i;
 175         long (*cb)();
 176
 177         if (b == NULL)
 178                 return(0);
 179
 180         cb=b->callback;
 181         if ((b->method == NULL) || (b->method->bwrite == NULL))
 182                 {
 183                 BIOerr(BIO_F_BIO_WRITE,BIO_R_UNSUPPORTED_METHOD);
 184                 return(-2);
 185                 }
 186
 187         if ((cb != NULL) &&
 188                 ((i=(int)cb(b,BIO_CB_WRITE,in,inl,0L,1L)) <= 0))
 189                         return(i);
 190
 191         if (!b->init)
 192                 {
 193                 BIOerr(BIO_F_BIO_WRITE,BIO_R_UNINITIALIZED);
 194                 return(-2);
 195                 }
 196
 197         i=b->method->bwrite(b,in,inl);
 198
 199         if (i > 0) b->num_write+=(unsigned long)i;
 200
 201         /* This is evil and not thread safe.  If the BIO has been freed,
 202          * we must not call the callback.  The only way to be able to
 203          * determine this is the reference count which is now invalid since
 204          * the memory has been free()ed.
 205          */
 206         if (b->references <= 0) abort();
 207         if (cb != NULL) /* && (b->references >= 1)) */
 208                 i=(int)cb(b,BIO_CB_WRITE|BIO_CB_RETURN,in,inl,
 209                         0L,(long)i);
 210         return(i);
 211         }
 212
 213 int BIO_puts(BIO *b, const char *in)
 214         {
 215         int i;
 216         long (*cb)();
 217
 218         if ((b == NULL) || (b->method == NULL) || (b->method->bputs == NULL))
 219                 {
 220                 BIOerr(BIO_F_BIO_PUTS,BIO_R_UNSUPPORTED_METHOD);
 221                 return(-2);
 222                 }
 223
 224         cb=b->callback;
 225
 226         if ((cb != NULL) &&
 227                 ((i=(int)cb(b,BIO_CB_PUTS,in,0,0L,1L)) <= 0))
 228                         return(i);
 229
 230         if (!b->init)
 231                 {
 232                 BIOerr(BIO_F_BIO_PUTS,BIO_R_UNINITIALIZED);
 233                 return(-2);
 234                 }
 235
 236         i=b->method->bputs(b,in);
 237
 238         if (cb != NULL)
 239                 i=(int)cb(b,BIO_CB_PUTS|BIO_CB_RETURN,in,0,
 240                         0L,(long)i);
 241         return(i);
 242         }
 243
 244 int BIO_gets(BIO *b, char *in, int inl)
 245         {
 246         int i;
 247         long (*cb)();
 248
 249         if ((b == NULL) || (b->method == NULL) || (b->method->bgets == NULL))
 250                 {
 251                 BIOerr(BIO_F_BIO_GETS,BIO_R_UNSUPPORTED_METHOD);
 252                 return(-2);
 253                 }
 254
 255         cb=b->callback;
 256
 257         if ((cb != NULL) &&
 258                 ((i=(int)cb(b,BIO_CB_GETS,in,inl,0L,1L)) <= 0))
 259                         return(i);
 260
 261         if (!b->init)
 262                 {
 263                 BIOerr(BIO_F_BIO_GETS,BIO_R_UNINITIALIZED);
 264                 return(-2);
 265                 }
 266
 267         i=b->method->bgets(b,in,inl);
 268
 269         if (cb != NULL)
 270                 i=(int)cb(b,BIO_CB_GETS|BIO_CB_RETURN,in,inl,
 271                         0L,(long)i);
 272         return(i);
 273         }
 274
 275 long BIO_int_ctrl(BIO *b, int cmd, long larg, int iarg)
 276         {
 277         int i;
 278
 279         i=iarg;
 280         return(BIO_ctrl(b,cmd,larg,(char *)&i));
 281         }
 282
 283 char *BIO_ptr_ctrl(BIO *b, int cmd, long larg)
 284         {
 285         char *p=NULL;
 286
 287         if (BIO_ctrl(b,cmd,larg,(char *)&p) <= 0)
 288                 return(NULL);
 289         else
 290                 return(p);
 291         }
 292
 293 long BIO_ctrl(BIO *b, int cmd, long larg, char *parg)
 294         {
 295         long ret;
 296         long (*cb)();
 297
 298         if (b == NULL) return(0);
 299
 300         if ((b->method == NULL) || (b->method->ctrl == NULL))
 301                 {
 302                 BIOerr(BIO_F_BIO_CTRL,BIO_R_UNSUPPORTED_METHOD);
 303                 return(-2);
 304                 }
 305
 306         cb=b->callback;
 307
 308         if ((cb != NULL) &&
 309                 ((ret=cb(b,BIO_CB_CTRL,parg,cmd,larg,1L)) <= 0))
 310                 return(ret);
 311
 312         ret=b->method->ctrl(b,cmd,larg,parg);
 313
 314         if (cb != NULL)
 315                 ret=cb(b,BIO_CB_CTRL|BIO_CB_RETURN,parg,cmd,
 316                         larg,ret);
 317         return(ret);
 318         }
 319
 320 /* put the 'bio' on the end of b's list of operators */
 321 BIO *BIO_push(BIO *b, BIO *bio)
 322         {
 323         BIO *lb;
 324
 325         if (b == NULL) return(bio);
 326         lb=b;
 327         while (lb->next_bio != NULL)
 328                 lb=lb->next_bio;
 329         lb->next_bio=bio;
 330         if (bio != NULL)
 331                 bio->prev_bio=lb;
 332         /* called to do internal processing */
 333         BIO_ctrl(b,BIO_CTRL_PUSH,0,NULL);
 334         return(b);
 335         }
 336
 337 /* Remove the first and return the rest */
 338 BIO *BIO_pop(BIO *b)
 339         {
 340         BIO *ret;
 341
 342         if (b == NULL) return(NULL);
 343         ret=b->next_bio;
 344
 345         if (b->prev_bio != NULL)
 346                 b->prev_bio->next_bio=b->next_bio;
 347         if (b->next_bio != NULL)
 348                 b->next_bio->prev_bio=b->prev_bio;
 349
 350         b->next_bio=NULL;
 351         b->prev_bio=NULL;
 352         BIO_ctrl(b,BIO_CTRL_POP,0,NULL);
 353         return(ret);
 354         }
 355
 356 BIO *BIO_get_retry_BIO(BIO *bio, int *reason)
 357         {
 358         BIO *b,*last;
 359
 360         b=last=bio;
 361         for (;;)
 362                 {
 363                 if (!BIO_should_retry(b)) break;
 364                 last=b;
 365                 b=b->next_bio;
 366                 if (b == NULL) break;
 367                 }
 368         if (reason != NULL) *reason=last->retry_reason;
 369         return(last);
 370         }
 371
 372 int BIO_get_retry_reason(BIO *bio)
 373         {
 374         return(bio->retry_reason);
 375         }
 376
 377 BIO *BIO_find_type(BIO *bio, int type)
 378         {
 379         int mt,mask;
 380
 381         mask=type&0xff;
 382         do      {
 383                 if (bio->method != NULL)
 384                         {
 385                         mt=bio->method->type;
 386
 387                         if (!mask)
 388                                 {
 389                                 if (mt & type) return(bio);
 390                                 }
 391                         else if (mt == type)
 392                                 return(bio);
 393                         }
 394                 bio=bio->next_bio;
 395                 } while (bio != NULL);
 396         return(NULL);
 397         }
 398
 399 void BIO_free_all(BIO *bio)
 400         {
 401         BIO *b;
 402         int ref;
 403
 404         while (bio != NULL)
 405                 {
 406                 b=bio;
 407                 ref=b->references;
 408                 bio=bio->next_bio;
 409                 BIO_free(b);
 410                 /* Since ref count > 1, don't free anyone else. */
 411                 if (ref > 1) break;
 412                 }
 413         }
 414
 415 BIO *BIO_dup_chain(BIO *in)
 416         {
 417         BIO *ret=NULL,*eoc=NULL,*bio,*new;
 418
 419         for (bio=in; bio != NULL; bio=bio->next_bio)
 420                 {
 421                 if ((new=BIO_new(bio->method)) == NULL) goto err;
 422                 new->callback=bio->callback;
 423                 new->cb_arg=bio->cb_arg;
 424                 new->init=bio->init;
 425                 new->shutdown=bio->shutdown;
 426                 new->flags=bio->flags;
 427
 428                 /* This will let SSL_s_sock() work with stdin/stdout */
 429                 new->num=bio->num;
 430
 431                 if (!BIO_dup_state(bio,(char *)new))
 432                         {
 433                         BIO_free(new);
 434                         goto err;
 435                         }
 436
 437                 /* copy app data */
 438                 if (!CRYPTO_dup_ex_data(bio_meth,&new->ex_data,&bio->ex_data))
 439                         goto err;
 440
 441                 if (ret == NULL)
 442                         {
 443                         eoc=new;
 444                         ret=eoc;
 445                         }
 446                 else
 447                         {
 448                         BIO_push(eoc,new);
 449                         eoc=new;
 450                         }
 451                 }
 452         return(ret);
 453 err:
 454         if (ret != NULL)
 455                 BIO_free(ret);
 456         return(NULL);
 457         }
 458
 459 void BIO_copy_next_retry(BIO *b)
 460         {
 461         BIO_set_flags(b,BIO_get_retry_flags(b->next_bio));
 462         b->retry_reason=b->next_bio->retry_reason;
 463         }
 464
 465 int BIO_get_ex_new_index(long argl, char *argp, int (*new_func)(),
 466              int (*dup_func)(), void (*free_func)())
 467         {
 468         bio_meth_num++;
 469         return(CRYPTO_get_ex_new_index(bio_meth_num-1,&bio_meth,
 470                 argl,argp,new_func,dup_func,free_func));
 471         }
 472
 473 int BIO_set_ex_data(BIO *bio, int idx, char *data)
 474         {
 475         return(CRYPTO_set_ex_data(&(bio->ex_data),idx,data));
 476         }
 477
 478 char *BIO_get_ex_data(BIO *bio, int idx)
 479         {
 480         return(CRYPTO_get_ex_data(&(bio->ex_data),idx));
 481         }
 482