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 ret = (DSO *)OPENSSL_malloc(sizeof(DSO)); 107 if (ret == NULL) { 108 DSOerr(DSO_F_DSO_NEW_METHOD, ERR_R_MALLOC_FAILURE); 109 return (NULL); 110 } 111 memset(ret, 0, sizeof(DSO)); 112 ret->meth_data = sk_void_new_null(); 113 if (ret->meth_data == NULL) { 114 /* sk_new doesn't generate any errors so we do */ 115 DSOerr(DSO_F_DSO_NEW_METHOD, ERR_R_MALLOC_FAILURE); 116 OPENSSL_free(ret); 117 return (NULL); 118 } 119 if (meth == NULL) 120 ret->meth = default_DSO_meth; 121 else 122 ret->meth = meth; 123 ret->references = 1; 124 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) { 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 DSOerr(DSO_F_DSO_FREE, ERR_R_PASSED_NULL_PARAMETER); 137 return (0); 138 } 139 140 i = CRYPTO_add(&dso->references, -1, CRYPTO_LOCK_DSO); 141 #ifdef REF_PRINT 142 REF_PRINT("DSO", dso); 143 #endif 144 if (i > 0) 145 return (1); 146 #ifdef REF_CHECK 147 if (i < 0) { 148 fprintf(stderr, "DSO_free, bad reference count\n"); 149 abort(); 150 } 151 #endif 152 153 if ((dso->meth->dso_unload != NULL) && !dso->meth->dso_unload(dso)) { 154 DSOerr(DSO_F_DSO_FREE, DSO_R_UNLOAD_FAILED); 155 return (0); 156 } 157 158 if ((dso->meth->finish != NULL) && !dso->meth->finish(dso)) { 159 DSOerr(DSO_F_DSO_FREE, DSO_R_FINISH_FAILED); 160 return (0); 161 } 162 163 sk_void_free(dso->meth_data); 164 if (dso->filename != NULL) 165 OPENSSL_free(dso->filename); 166 if (dso->loaded_filename != NULL) 167 OPENSSL_free(dso->loaded_filename); 168 169 OPENSSL_free(dso); 170 return (1); 171 } 172 173 int DSO_flags(DSO *dso) 174 { 175 return ((dso == NULL) ? 0 : dso->flags); 176 } 177 178 int DSO_up_ref(DSO *dso) 179 { 180 if (dso == NULL) { 181 DSOerr(DSO_F_DSO_UP_REF, ERR_R_PASSED_NULL_PARAMETER); 182 return (0); 183 } 184 185 CRYPTO_add(&dso->references, 1, CRYPTO_LOCK_DSO); 186 return (1); 187 } 188 189 DSO *DSO_load(DSO *dso, const char *filename, DSO_METHOD *meth, int flags) 190 { 191 DSO *ret; 192 int allocated = 0; 193 194 if (dso == NULL) { 195 ret = DSO_new_method(meth); 196 if (ret == NULL) { 197 DSOerr(DSO_F_DSO_LOAD, ERR_R_MALLOC_FAILURE); 198 goto err; 199 } 200 allocated = 1; 201 /* Pass the provided flags to the new DSO object */ 202 if (DSO_ctrl(ret, DSO_CTRL_SET_FLAGS, flags, NULL) < 0) { 203 DSOerr(DSO_F_DSO_LOAD, DSO_R_CTRL_FAILED); 204 goto err; 205 } 206 } else 207 ret = dso; 208 /* Don't load if we're currently already loaded */ 209 if (ret->filename != NULL) { 210 DSOerr(DSO_F_DSO_LOAD, DSO_R_DSO_ALREADY_LOADED); 211 goto err; 212 } 213 /* 214 * filename can only be NULL if we were passed a dso that already has one 215 * set. 216 */ 217 if (filename != NULL) 218 if (!DSO_set_filename(ret, filename)) { 219 DSOerr(DSO_F_DSO_LOAD, DSO_R_SET_FILENAME_FAILED); 220 goto err; 221 } 222 filename = ret->filename; 223 if (filename == NULL) { 224 DSOerr(DSO_F_DSO_LOAD, DSO_R_NO_FILENAME); 225 goto err; 226 } 227 if (ret->meth->dso_load == NULL) { 228 DSOerr(DSO_F_DSO_LOAD, DSO_R_UNSUPPORTED); 229 goto err; 230 } 231 if (!ret->meth->dso_load(ret)) { 232 DSOerr(DSO_F_DSO_LOAD, DSO_R_LOAD_FAILED); 233 goto err; 234 } 235 /* Load succeeded */ 236 return (ret); 237 err: 238 if (allocated) 239 DSO_free(ret); 240 return (NULL); 241 } 242 243 void *DSO_bind_var(DSO *dso, const char *symname) 244 { 245 void *ret = NULL; 246 247 if ((dso == NULL) || (symname == NULL)) { 248 DSOerr(DSO_F_DSO_BIND_VAR, ERR_R_PASSED_NULL_PARAMETER); 249 return (NULL); 250 } 251 if (dso->meth->dso_bind_var == NULL) { 252 DSOerr(DSO_F_DSO_BIND_VAR, DSO_R_UNSUPPORTED); 253 return (NULL); 254 } 255 if ((ret = dso->meth->dso_bind_var(dso, symname)) == NULL) { 256 DSOerr(DSO_F_DSO_BIND_VAR, DSO_R_SYM_FAILURE); 257 return (NULL); 258 } 259 /* Success */ 260 return (ret); 261 } 262 263 DSO_FUNC_TYPE DSO_bind_func(DSO *dso, const char *symname) 264 { 265 DSO_FUNC_TYPE ret = NULL; 266 267 if ((dso == NULL) || (symname == NULL)) { 268 DSOerr(DSO_F_DSO_BIND_FUNC, ERR_R_PASSED_NULL_PARAMETER); 269 return (NULL); 270 } 271 if (dso->meth->dso_bind_func == NULL) { 272 DSOerr(DSO_F_DSO_BIND_FUNC, DSO_R_UNSUPPORTED); 273 return (NULL); 274 } 275 if ((ret = dso->meth->dso_bind_func(dso, symname)) == NULL) { 276 DSOerr(DSO_F_DSO_BIND_FUNC, DSO_R_SYM_FAILURE); 277 return (NULL); 278 } 279 /* Success */ 280 return (ret); 281 } 282 283 /* 284 * I don't really like these *_ctrl functions very much to be perfectly 285 * honest. For one thing, I think I have to return a negative value for any 286 * error because possible DSO_ctrl() commands may return values such as 287 * "size"s that can legitimately be zero (making the standard 288 * "if(DSO_cmd(...))" form that works almost everywhere else fail at odd 289 * times. I'd prefer "output" values to be passed by reference and the return 290 * value as success/failure like usual ... but we conform when we must... :-) 291 */ 292 long DSO_ctrl(DSO *dso, int cmd, long larg, void *parg) 293 { 294 if (dso == NULL) { 295 DSOerr(DSO_F_DSO_CTRL, ERR_R_PASSED_NULL_PARAMETER); 296 return (-1); 297 } 298 /* 299 * We should intercept certain generic commands and only pass control to 300 * the method-specific ctrl() function if it's something we don't handle. 301 */ 302 switch (cmd) { 303 case DSO_CTRL_GET_FLAGS: 304 return dso->flags; 305 case DSO_CTRL_SET_FLAGS: 306 dso->flags = (int)larg; 307 return (0); 308 case DSO_CTRL_OR_FLAGS: 309 dso->flags |= (int)larg; 310 return (0); 311 default: 312 break; 313 } 314 if ((dso->meth == NULL) || (dso->meth->dso_ctrl == NULL)) { 315 DSOerr(DSO_F_DSO_CTRL, DSO_R_UNSUPPORTED); 316 return (-1); 317 } 318 return (dso->meth->dso_ctrl(dso, cmd, larg, parg)); 319 } 320 321 int DSO_set_name_converter(DSO *dso, DSO_NAME_CONVERTER_FUNC cb, 322 DSO_NAME_CONVERTER_FUNC *oldcb) 323 { 324 if (dso == NULL) { 325 DSOerr(DSO_F_DSO_SET_NAME_CONVERTER, ERR_R_PASSED_NULL_PARAMETER); 326 return (0); 327 } 328 if (oldcb) 329 *oldcb = dso->name_converter; 330 dso->name_converter = cb; 331 return (1); 332 } 333 334 const char *DSO_get_filename(DSO *dso) 335 { 336 if (dso == NULL) { 337 DSOerr(DSO_F_DSO_GET_FILENAME, ERR_R_PASSED_NULL_PARAMETER); 338 return (NULL); 339 } 340 return (dso->filename); 341 } 342 343 int DSO_set_filename(DSO *dso, const char *filename) 344 { 345 char *copied; 346 347 if ((dso == NULL) || (filename == NULL)) { 348 DSOerr(DSO_F_DSO_SET_FILENAME, ERR_R_PASSED_NULL_PARAMETER); 349 return (0); 350 } 351 if (dso->loaded_filename) { 352 DSOerr(DSO_F_DSO_SET_FILENAME, DSO_R_DSO_ALREADY_LOADED); 353 return (0); 354 } 355 /* We'll duplicate filename */ 356 copied = OPENSSL_malloc(strlen(filename) + 1); 357 if (copied == NULL) { 358 DSOerr(DSO_F_DSO_SET_FILENAME, ERR_R_MALLOC_FAILURE); 359 return (0); 360 } 361 BUF_strlcpy(copied, filename, strlen(filename) + 1); 362 if (dso->filename) 363 OPENSSL_free(dso->filename); 364 dso->filename = copied; 365 return (1); 366 } 367 368 char *DSO_merge(DSO *dso, const char *filespec1, const char *filespec2) 369 { 370 char *result = NULL; 371 372 if (dso == NULL || filespec1 == NULL) { 373 DSOerr(DSO_F_DSO_MERGE, ERR_R_PASSED_NULL_PARAMETER); 374 return (NULL); 375 } 376 if ((dso->flags & DSO_FLAG_NO_NAME_TRANSLATION) == 0) { 377 if (dso->merger != NULL) 378 result = dso->merger(dso, filespec1, filespec2); 379 else if (dso->meth->dso_merger != NULL) 380 result = dso->meth->dso_merger(dso, filespec1, filespec2); 381 } 382 return (result); 383 } 384 385 char *DSO_convert_filename(DSO *dso, const char *filename) 386 { 387 char *result = NULL; 388 389 if (dso == NULL) { 390 DSOerr(DSO_F_DSO_CONVERT_FILENAME, ERR_R_PASSED_NULL_PARAMETER); 391 return (NULL); 392 } 393 if (filename == NULL) 394 filename = dso->filename; 395 if (filename == NULL) { 396 DSOerr(DSO_F_DSO_CONVERT_FILENAME, DSO_R_NO_FILENAME); 397 return (NULL); 398 } 399 if ((dso->flags & DSO_FLAG_NO_NAME_TRANSLATION) == 0) { 400 if (dso->name_converter != NULL) 401 result = dso->name_converter(dso, filename); 402 else if (dso->meth->dso_name_converter != NULL) 403 result = dso->meth->dso_name_converter(dso, filename); 404 } 405 if (result == NULL) { 406 result = OPENSSL_malloc(strlen(filename) + 1); 407 if (result == NULL) { 408 DSOerr(DSO_F_DSO_CONVERT_FILENAME, ERR_R_MALLOC_FAILURE); 409 return (NULL); 410 } 411 BUF_strlcpy(result, filename, strlen(filename) + 1); 412 } 413 return (result); 414 } 415 416 const char *DSO_get_loaded_filename(DSO *dso) 417 { 418 if (dso == NULL) { 419 DSOerr(DSO_F_DSO_GET_LOADED_FILENAME, ERR_R_PASSED_NULL_PARAMETER); 420 return (NULL); 421 } 422 return (dso->loaded_filename); 423 } 424 425 int DSO_pathbyaddr(void *addr, char *path, int sz) 426 { 427 DSO_METHOD *meth = default_DSO_meth; 428 if (meth == NULL) 429 meth = DSO_METHOD_openssl(); 430 if (meth->pathbyaddr == NULL) { 431 DSOerr(DSO_F_DSO_PATHBYADDR, DSO_R_UNSUPPORTED); 432 return -1; 433 } 434 return (*meth->pathbyaddr) (addr, path, sz); 435 } 436 437 void *DSO_global_lookup(const char *name) 438 { 439 DSO_METHOD *meth = default_DSO_meth; 440 if (meth == NULL) 441 meth = DSO_METHOD_openssl(); 442 if (meth->globallookup == NULL) { 443 DSOerr(DSO_F_DSO_GLOBAL_LOOKUP, DSO_R_UNSUPPORTED); 444 return NULL; 445 } 446 return (*meth->globallookup) (name); 447 } 448