crypto/dso/dso_lib.c

   1 /* dso_lib.c -*- mode:C; c-file-style: "eay" -*- */
   2 /* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
   3  * project 2000.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2000 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58
  59 #include <stdio.h>
  60 #include <openssl/crypto.h>
  61 #include "cryptlib.h"
  62 #include <openssl/dso.h>
  63
  64 static DSO_METHOD *default_DSO_meth = NULL;
  65
  66 DSO *DSO_new(void)
  67         {
  68         return(DSO_new_method(NULL));
  69         }
  70
  71 void DSO_set_default_method(DSO_METHOD *meth)
  72         {
  73         default_DSO_meth = meth;
  74         }
  75
  76 DSO_METHOD *DSO_get_default_method(void)
  77         {
  78         return(default_DSO_meth);
  79         }
  80
  81 DSO_METHOD *DSO_get_method(DSO *dso)
  82         {
  83         return(dso->meth);
  84         }
  85
  86 DSO_METHOD *DSO_set_method(DSO *dso, DSO_METHOD *meth)
  87         {
  88         DSO_METHOD *mtmp;
  89         mtmp = dso->meth;
  90         dso->meth = meth;
  91         return(mtmp);
  92         }
  93
  94 DSO *DSO_new_method(DSO_METHOD *meth)
  95         {
  96         DSO *ret;
  97
  98         if(default_DSO_meth == NULL)
  99                 /* We default to DSO_METH_openssl() which in turn defaults
 100                  * to stealing the "best available" method. Will fallback
 101                  * to DSO_METH_null() in the worst case. */
 102                 default_DSO_meth = DSO_METHOD_openssl();
 103         ret = (DSO *)OPENSSL_malloc(sizeof(DSO));
 104         if(ret == NULL)
 105                 {
 106                 DSOerr(DSO_F_DSO_NEW_METHOD,ERR_R_MALLOC_FAILURE);
 107                 return(NULL);
 108                 }
 109         memset(ret, 0, sizeof(DSO));
 110         ret->meth_data = sk_new_null();
 111         if(ret->meth_data == NULL)
 112                 {
 113                 /* sk_new doesn't generate any errors so we do */
 114                 DSOerr(DSO_F_DSO_NEW_METHOD,ERR_R_MALLOC_FAILURE);
 115                 OPENSSL_free(ret);
 116                 return(NULL);
 117                 }
 118         if(meth == NULL)
 119                 ret->meth = default_DSO_meth;
 120         else
 121                 ret->meth = meth;
 122         ret->references = 1;
 123         if((ret->meth->init != NULL) && !ret->meth->init(ret))
 124                 {
 125                 OPENSSL_free(ret);
 126                 ret=NULL;
 127                 }
 128         return(ret);
 129         }
 130
 131 int DSO_free(DSO *dso)
 132         {
 133         int i;
 134
 135         if(dso == NULL)
 136                 {
 137                 DSOerr(DSO_F_DSO_FREE,ERR_R_PASSED_NULL_PARAMETER);
 138                 return(0);
 139                 }
 140
 141         i=CRYPTO_add(&dso->references,-1,CRYPTO_LOCK_DSO);
 142 #ifdef REF_PRINT
 143         REF_PRINT("DSO",dso);
 144 #endif
 145         if(i > 0) return(1);
 146 #ifdef REF_CHECK
 147         if(i < 0)
 148                 {
 149                 fprintf(stderr,"DSO_free, bad reference count\n");
 150                 abort();
 151                 }
 152 #endif
 153
 154         if((dso->meth->dso_unload != NULL) && !dso->meth->dso_unload(dso))
 155                 {
 156                 DSOerr(DSO_F_DSO_FREE,DSO_R_UNLOAD_FAILED);
 157                 return(0);
 158                 }
 159
 160         if((dso->meth->finish != NULL) && !dso->meth->finish(dso))
 161                 {
 162                 DSOerr(DSO_F_DSO_FREE,DSO_R_FINISH_FAILED);
 163                 return(0);
 164                 }
 165
 166         sk_free(dso->meth_data);
 167         if(dso->filename != NULL)
 168                 OPENSSL_free(dso->filename);
 169         if(dso->loaded_filename != NULL)
 170                 OPENSSL_free(dso->loaded_filename);
 171
 172         OPENSSL_free(dso);
 173         return(1);
 174         }
 175
 176 int DSO_flags(DSO *dso)
 177         {
 178         return((dso == NULL) ? 0 : dso->flags);
 179         }
 180
 181
 182 int DSO_up_ref(DSO *dso)
 183         {
 184         if (dso == NULL)
 185                 {
 186                 DSOerr(DSO_F_DSO_UP_REF,ERR_R_PASSED_NULL_PARAMETER);
 187                 return(0);
 188                 }
 189
 190         CRYPTO_add(&dso->references,1,CRYPTO_LOCK_DSO);
 191         return(1);
 192         }
 193
 194 DSO *DSO_load(DSO *dso, const char *filename, DSO_METHOD *meth, int flags)
 195         {
 196         DSO *ret;
 197         int allocated = 0;
 198
 199         if(dso == NULL)
 200                 {
 201                 ret = DSO_new_method(meth);
 202                 if(ret == NULL)
 203                         {
 204                         DSOerr(DSO_F_DSO_LOAD,ERR_R_MALLOC_FAILURE);
 205                         goto err;
 206                         }
 207                 allocated = 1;
 208                 /* Pass the provided flags to the new DSO object */
 209                 if(DSO_ctrl(ret, DSO_CTRL_SET_FLAGS, flags, NULL) < 0)
 210                         {
 211                         DSOerr(DSO_F_DSO_LOAD,DSO_R_CTRL_FAILED);
 212                         goto err;
 213                         }
 214                 }
 215         else
 216                 ret = dso;
 217         /* Don't load if we're currently already loaded */
 218         if(ret->filename != NULL)
 219                 {
 220                 DSOerr(DSO_F_DSO_LOAD,DSO_R_DSO_ALREADY_LOADED);
 221                 goto err;
 222                 }
 223         /* filename can only be NULL if we were passed a dso that already has
 224          * one set. */
 225         if(filename != NULL)
 226                 if(!DSO_set_filename(ret, filename))
 227                         {
 228                         DSOerr(DSO_F_DSO_LOAD,DSO_R_SET_FILENAME_FAILED);
 229                         goto err;
 230                         }
 231         filename = ret->filename;
 232         if(filename == NULL)
 233                 {
 234                 DSOerr(DSO_F_DSO_LOAD,DSO_R_NO_FILENAME);
 235                 goto err;
 236                 }
 237         if(ret->meth->dso_load == NULL)
 238                 {
 239                 DSOerr(DSO_F_DSO_LOAD,DSO_R_UNSUPPORTED);
 240                 goto err;
 241                 }
 242         if(!ret->meth->dso_load(ret))
 243                 {
 244                 DSOerr(DSO_F_DSO_LOAD,DSO_R_LOAD_FAILED);
 245                 goto err;
 246                 }
 247         /* Load succeeded */
 248         return(ret);
 249 err:
 250         if(allocated)
 251                 DSO_free(ret);
 252         return(NULL);
 253         }
 254
 255 void *DSO_bind_var(DSO *dso, const char *symname)
 256         {
 257         void *ret = NULL;
 258
 259         if((dso == NULL) || (symname == NULL))
 260                 {
 261                 DSOerr(DSO_F_DSO_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER);
 262                 return(NULL);
 263                 }
 264         if(dso->meth->dso_bind_var == NULL)
 265                 {
 266                 DSOerr(DSO_F_DSO_BIND_VAR,DSO_R_UNSUPPORTED);
 267                 return(NULL);
 268                 }
 269         if((ret = dso->meth->dso_bind_var(dso, symname)) == NULL)
 270                 {
 271                 DSOerr(DSO_F_DSO_BIND_VAR,DSO_R_SYM_FAILURE);
 272                 return(NULL);
 273                 }
 274         /* Success */
 275         return(ret);
 276         }
 277
 278 DSO_FUNC_TYPE DSO_bind_func(DSO *dso, const char *symname)
 279         {
 280         DSO_FUNC_TYPE ret = NULL;
 281
 282         if((dso == NULL) || (symname == NULL))
 283                 {
 284                 DSOerr(DSO_F_DSO_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER);
 285                 return(NULL);
 286                 }
 287         if(dso->meth->dso_bind_func == NULL)
 288                 {
 289                 DSOerr(DSO_F_DSO_BIND_FUNC,DSO_R_UNSUPPORTED);
 290                 return(NULL);
 291                 }
 292 fprintf(stderr,"boo\n");
 293         if((ret = dso->meth->dso_bind_func(dso, symname)) == NULL)
 294                 {
 295                 DSOerr(DSO_F_DSO_BIND_FUNC,DSO_R_SYM_FAILURE);
 296                 return(NULL);
 297                 }
 298         /* Success */
 299         return(ret);
 300         }
 301
 302 /* I don't really like these *_ctrl functions very much to be perfectly
 303  * honest. For one thing, I think I have to return a negative value for
 304  * any error because possible DSO_ctrl() commands may return values
 305  * such as "size"s that can legitimately be zero (making the standard
 306  * "if(DSO_cmd(...))" form that works almost everywhere else fail at
 307  * odd times. I'd prefer "output" values to be passed by reference and
 308  * the return value as success/failure like usual ... but we conform
 309  * when we must... :-) */
 310 long DSO_ctrl(DSO *dso, int cmd, long larg, void *parg)
 311         {
 312         if(dso == NULL)
 313                 {
 314                 DSOerr(DSO_F_DSO_CTRL,ERR_R_PASSED_NULL_PARAMETER);
 315                 return(-1);
 316                 }
 317         /* We should intercept certain generic commands and only pass control
 318          * to the method-specific ctrl() function if it's something we don't
 319          * handle. */
 320         switch(cmd)
 321                 {
 322         case DSO_CTRL_GET_FLAGS:
 323                 return dso->flags;
 324         case DSO_CTRL_SET_FLAGS:
 325                 dso->flags = (int)larg;
 326                 return(0);
 327         case DSO_CTRL_OR_FLAGS:
 328                 dso->flags |= (int)larg;
 329                 return(0);
 330         default:
 331                 break;
 332                 }
 333         if((dso->meth == NULL) || (dso->meth->dso_ctrl == NULL))
 334                 {
 335                 DSOerr(DSO_F_DSO_CTRL,DSO_R_UNSUPPORTED);
 336                 return(-1);
 337                 }
 338         return(dso->meth->dso_ctrl(dso,cmd,larg,parg));
 339         }
 340
 341 int DSO_set_name_converter(DSO *dso, DSO_NAME_CONVERTER_FUNC cb,
 342                         DSO_NAME_CONVERTER_FUNC *oldcb)
 343         {
 344         if(dso == NULL)
 345                 {
 346                 DSOerr(DSO_F_DSO_SET_NAME_CONVERTER,
 347                                 ERR_R_PASSED_NULL_PARAMETER);
 348                 return(0);
 349                 }
 350         if(oldcb)
 351                 *oldcb = dso->name_converter;
 352         dso->name_converter = cb;
 353         return(1);
 354         }
 355
 356 const char *DSO_get_filename(DSO *dso)
 357         {
 358         if(dso == NULL)
 359                 {
 360                 DSOerr(DSO_F_DSO_GET_FILENAME,ERR_R_PASSED_NULL_PARAMETER);
 361                 return(NULL);
 362                 }
 363         return(dso->filename);
 364         }
 365
 366 int DSO_set_filename(DSO *dso, const char *filename)
 367         {
 368         char *copied;
 369
 370         if((dso == NULL) || (filename == NULL))
 371                 {
 372                 DSOerr(DSO_F_DSO_SET_FILENAME,ERR_R_PASSED_NULL_PARAMETER);
 373                 return(0);
 374                 }
 375         if(dso->loaded_filename)
 376                 {
 377                 DSOerr(DSO_F_DSO_SET_FILENAME,DSO_R_DSO_ALREADY_LOADED);
 378                 return(0);
 379                 }
 380         /* We'll duplicate filename */
 381         copied = OPENSSL_malloc(strlen(filename) + 1);
 382         if(copied == NULL)
 383                 {
 384                 DSOerr(DSO_F_DSO_SET_FILENAME,ERR_R_MALLOC_FAILURE);
 385                 return(0);
 386                 }
 387         BUF_strlcpy(copied, filename, strlen(filename) + 1);
 388         if(dso->filename)
 389                 OPENSSL_free(dso->filename);
 390         dso->filename = copied;
 391         return(1);
 392         }
 393
 394 char *DSO_merge(DSO *dso, const char *filespec1, const char *filespec2)
 395         {
 396         char *result = NULL;
 397
 398         if(dso == NULL || filespec1 == NULL)
 399                 {
 400                 DSOerr(DSO_F_DSO_MERGE,ERR_R_PASSED_NULL_PARAMETER);
 401                 return(NULL);
 402                 }
 403         if(filespec1 == NULL)
 404                 filespec1 = dso->filename;
 405         if(filespec1 == NULL)
 406                 {
 407                 DSOerr(DSO_F_DSO_MERGE,DSO_R_NO_FILE_SPECIFICATION);
 408                 return(NULL);
 409                 }
 410         if((dso->flags & DSO_FLAG_NO_NAME_TRANSLATION) == 0)
 411                 {
 412                 if(dso->merger != NULL)
 413                         result = dso->merger(dso, filespec1, filespec2);
 414                 else if(dso->meth->dso_merger != NULL)
 415                         result = dso->meth->dso_merger(dso,
 416                                 filespec1, filespec2);
 417                 }
 418         return(result);
 419         }
 420
 421 char *DSO_convert_filename(DSO *dso, const char *filename)
 422         {
 423         char *result = NULL;
 424
 425         if(dso == NULL)
 426                 {
 427                 DSOerr(DSO_F_DSO_CONVERT_FILENAME,ERR_R_PASSED_NULL_PARAMETER);
 428                 return(NULL);
 429                 }
 430         if(filename == NULL)
 431                 filename = dso->filename;
 432         if(filename == NULL)
 433                 {
 434                 DSOerr(DSO_F_DSO_CONVERT_FILENAME,DSO_R_NO_FILENAME);
 435                 return(NULL);
 436                 }
 437         if((dso->flags & DSO_FLAG_NO_NAME_TRANSLATION) == 0)
 438                 {
 439                 if(dso->name_converter != NULL)
 440                         result = dso->name_converter(dso, filename);
 441                 else if(dso->meth->dso_name_converter != NULL)
 442                         result = dso->meth->dso_name_converter(dso, filename);
 443                 }
 444         if(result == NULL)
 445                 {
 446                 result = OPENSSL_malloc(strlen(filename) + 1);
 447                 if(result == NULL)
 448                         {
 449                         DSOerr(DSO_F_DSO_CONVERT_FILENAME,
 450                                         ERR_R_MALLOC_FAILURE);
 451                         return(NULL);
 452                         }
 453                 BUF_strlcpy(result, filename, strlen(filename) + 1);
 454                 }
 455         return(result);
 456         }
 457
 458 const char *DSO_get_loaded_filename(DSO *dso)
 459         {
 460         if(dso == NULL)
 461                 {
 462                 DSOerr(DSO_F_DSO_GET_LOADED_FILENAME,
 463                                 ERR_R_PASSED_NULL_PARAMETER);
 464                 return(NULL);
 465                 }
 466         return(dso->loaded_filename);
 467         }
 468
 469 int DSO_pathbyaddr(void *addr,char *path,int sz)
 470         {
 471         DSO_METHOD *meth = default_DSO_meth;
 472         if (meth == NULL) meth = DSO_METHOD_openssl();
 473         if (meth->pathbyaddr == NULL)
 474                 {
 475                 DSOerr(DSO_F_PATHBYADDR,DSO_R_UNSUPPORTED);
 476                 return -1;
 477                 }
 478         return (*meth->pathbyaddr)(addr,path,sz);
 479         }
 480
 481 /* This function should be used with caution! It looks up symbols in
 482  * *all* loaded modules and if module gets unloaded by somebody else
 483  * attempt to dereference the pointer is doomed to have fatal
 484  * consequences. Primary usage for this function is to probe *core*
 485  * system functionality, e.g. check if getnameinfo(3) is available
 486  * at run-time without bothering about OS-specific details such as
 487  * libc.so.versioning or where does it actually reside: in libc
 488  * itself or libsocket. */
 489 DSO_FUNC_TYPE DSO_global_lookup_func(const char *name)
 490         {
 491         DSO_METHOD *meth = default_DSO_meth;
 492         if (meth == NULL) meth = DSO_METHOD_openssl();
 493         if (meth->globallookup == NULL)
 494                 {
 495                 DSOerr(DSO_F_GLOBAL_LOOKUP_FUNC,DSO_R_UNSUPPORTED);
 496                 return NULL;
 497                 }
 498         return (*meth->globallookup)(name);
 499         }