crypto/dso/dso_lib.c

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