1 /* dso_dlfcn.c -*- mode:C; c-file-style: "eay" -*- */ 2 /* Written by Geoff Thorpe (geoff (at) 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 (at) 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 (at) cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh (at) cryptsoft.com). 56 * 57 */ 58 59 /* We need to do this early, because stdio.h includes the header files 60 that handle _GNU_SOURCE and other similar macros. Defining it later 61 is simply too late, because those headers are protected from re- 62 inclusion. */ 63 #ifdef __linux 64 # ifndef _GNU_SOURCE 65 # define _GNU_SOURCE /* make sure dladdr is declared */ 66 # endif 67 #endif 68 69 #include <stdio.h> 70 #include "cryptlib.h" 71 #include <openssl/dso.h> 72 73 #ifndef DSO_DLFCN 74 DSO_METHOD *DSO_METHOD_dlfcn(void) 75 { 76 return NULL; 77 } 78 #else 79 80 #ifdef HAVE_DLFCN_H 81 # ifdef __osf__ 82 # define __EXTENSIONS__ 83 # endif 84 # include <dlfcn.h> 85 # define HAVE_DLINFO 1 86 # if defined(_AIX) || defined(__CYGWIN__) || \ 87 defined(__SCO_VERSION__) || defined(_SCO_ELF) || \ 88 (defined(__osf__) && !defined(RTLD_NEXT)) || \ 89 (defined(__OpenBSD__) && !defined(RTLD_SELF)) 90 # undef HAVE_DLINFO 91 # endif 92 #endif 93 94 /* Part of the hack in "dlfcn_load" ... */ 95 #define DSO_MAX_TRANSLATED_SIZE 256 96 97 static int dlfcn_load(DSO *dso); 98 static int dlfcn_unload(DSO *dso); 99 static void *dlfcn_bind_var(DSO *dso, const char *symname); 100 static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname); 101 #if 0 102 static int dlfcn_unbind(DSO *dso, char *symname, void *symptr); 103 static int dlfcn_init(DSO *dso); 104 static int dlfcn_finish(DSO *dso); 105 static long dlfcn_ctrl(DSO *dso, int cmd, long larg, void *parg); 106 #endif 107 static char *dlfcn_name_converter(DSO *dso, const char *filename); 108 static char *dlfcn_merger(DSO *dso, const char *filespec1, 109 const char *filespec2); 110 static int dlfcn_pathbyaddr(void *addr,char *path,int sz); 111 static void *dlfcn_globallookup(const char *name); 112 113 static DSO_METHOD dso_meth_dlfcn = { 114 "OpenSSL 'dlfcn' shared library method", 115 dlfcn_load, 116 dlfcn_unload, 117 dlfcn_bind_var, 118 dlfcn_bind_func, 119 /* For now, "unbind" doesn't exist */ 120 #if 0 121 NULL, /* unbind_var */ 122 NULL, /* unbind_func */ 123 #endif 124 NULL, /* ctrl */ 125 dlfcn_name_converter, 126 dlfcn_merger, 127 NULL, /* init */ 128 NULL, /* finish */ 129 dlfcn_pathbyaddr, 130 dlfcn_globallookup 131 }; 132 133 DSO_METHOD *DSO_METHOD_dlfcn(void) 134 { 135 return(&dso_meth_dlfcn); 136 } 137 138 /* Prior to using the dlopen() function, we should decide on the flag 139 * we send. There's a few different ways of doing this and it's a 140 * messy venn-diagram to match up which platforms support what. So 141 * as we don't have autoconf yet, I'm implementing a hack that could 142 * be hacked further relatively easily to deal with cases as we find 143 * them. Initially this is to cope with OpenBSD. */ 144 #if defined(__OpenBSD__) || defined(__NetBSD__) 145 # ifdef DL_LAZY 146 # define DLOPEN_FLAG DL_LAZY 147 # else 148 # ifdef RTLD_NOW 149 # define DLOPEN_FLAG RTLD_NOW 150 # else 151 # define DLOPEN_FLAG 0 152 # endif 153 # endif 154 #else 155 # ifdef OPENSSL_SYS_SUNOS 156 # define DLOPEN_FLAG 1 157 # else 158 # define DLOPEN_FLAG RTLD_NOW /* Hope this works everywhere else */ 159 # endif 160 #endif 161 162 /* For this DSO_METHOD, our meth_data STACK will contain; 163 * (i) the handle (void*) returned from dlopen(). 164 */ 165 166 static int dlfcn_load(DSO *dso) 167 { 168 void *ptr = NULL; 169 /* See applicable comments in dso_dl.c */ 170 char *filename = DSO_convert_filename(dso, NULL); 171 int flags = DLOPEN_FLAG; 172 173 if(filename == NULL) 174 { 175 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_NO_FILENAME); 176 goto err; 177 } 178 179 #ifdef RTLD_GLOBAL 180 if (dso->flags & DSO_FLAG_GLOBAL_SYMBOLS) 181 flags |= RTLD_GLOBAL; 182 #endif 183 ptr = dlopen(filename, flags); 184 if(ptr == NULL) 185 { 186 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_LOAD_FAILED); 187 ERR_add_error_data(4, "filename(", filename, "): ", dlerror()); 188 goto err; 189 } 190 if(!sk_void_push(dso->meth_data, (char *)ptr)) 191 { 192 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_STACK_ERROR); 193 goto err; 194 } 195 /* Success */ 196 dso->loaded_filename = filename; 197 return(1); 198 err: 199 /* Cleanup! */ 200 if(filename != NULL) 201 OPENSSL_free(filename); 202 if(ptr != NULL) 203 dlclose(ptr); 204 return(0); 205 } 206 207 static int dlfcn_unload(DSO *dso) 208 { 209 void *ptr; 210 if(dso == NULL) 211 { 212 DSOerr(DSO_F_DLFCN_UNLOAD,ERR_R_PASSED_NULL_PARAMETER); 213 return(0); 214 } 215 if(sk_void_num(dso->meth_data) < 1) 216 return(1); 217 ptr = sk_void_pop(dso->meth_data); 218 if(ptr == NULL) 219 { 220 DSOerr(DSO_F_DLFCN_UNLOAD,DSO_R_NULL_HANDLE); 221 /* Should push the value back onto the stack in 222 * case of a retry. */ 223 sk_void_push(dso->meth_data, ptr); 224 return(0); 225 } 226 /* For now I'm not aware of any errors associated with dlclose() */ 227 dlclose(ptr); 228 return(1); 229 } 230 231 static void *dlfcn_bind_var(DSO *dso, const char *symname) 232 { 233 void *ptr, *sym; 234 235 if((dso == NULL) || (symname == NULL)) 236 { 237 DSOerr(DSO_F_DLFCN_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER); 238 return(NULL); 239 } 240 if(sk_void_num(dso->meth_data) < 1) 241 { 242 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_STACK_ERROR); 243 return(NULL); 244 } 245 ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1); 246 if(ptr == NULL) 247 { 248 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_NULL_HANDLE); 249 return(NULL); 250 } 251 sym = dlsym(ptr, symname); 252 if(sym == NULL) 253 { 254 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_SYM_FAILURE); 255 ERR_add_error_data(4, "symname(", symname, "): ", dlerror()); 256 return(NULL); 257 } 258 return(sym); 259 } 260 261 static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname) 262 { 263 void *ptr; 264 union { 265 DSO_FUNC_TYPE sym; 266 void *dlret; 267 } u; 268 269 if((dso == NULL) || (symname == NULL)) 270 { 271 DSOerr(DSO_F_DLFCN_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER); 272 return(NULL); 273 } 274 if(sk_void_num(dso->meth_data) < 1) 275 { 276 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_STACK_ERROR); 277 return(NULL); 278 } 279 ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1); 280 if(ptr == NULL) 281 { 282 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_NULL_HANDLE); 283 return(NULL); 284 } 285 u.dlret = dlsym(ptr, symname); 286 if(u.dlret == NULL) 287 { 288 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_SYM_FAILURE); 289 ERR_add_error_data(4, "symname(", symname, "): ", dlerror()); 290 return(NULL); 291 } 292 return u.sym; 293 } 294 295 static char *dlfcn_merger(DSO *dso, const char *filespec1, 296 const char *filespec2) 297 { 298 char *merged; 299 300 if(!filespec1 && !filespec2) 301 { 302 DSOerr(DSO_F_DLFCN_MERGER, 303 ERR_R_PASSED_NULL_PARAMETER); 304 return(NULL); 305 } 306 /* If the first file specification is a rooted path, it rules. 307 same goes if the second file specification is missing. */ 308 if (!filespec2 || (filespec1 != NULL && filespec1[0] == '/')) 309 { 310 merged = OPENSSL_malloc(strlen(filespec1) + 1); 311 if(!merged) 312 { 313 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE); 314 return(NULL); 315 } 316 strcpy(merged, filespec1); 317 } 318 /* If the first file specification is missing, the second one rules. */ 319 else if (!filespec1) 320 { 321 merged = OPENSSL_malloc(strlen(filespec2) + 1); 322 if(!merged) 323 { 324 DSOerr(DSO_F_DLFCN_MERGER, 325 ERR_R_MALLOC_FAILURE); 326 return(NULL); 327 } 328 strcpy(merged, filespec2); 329 } 330 else 331 /* This part isn't as trivial as it looks. It assumes that 332 the second file specification really is a directory, and 333 makes no checks whatsoever. Therefore, the result becomes 334 the concatenation of filespec2 followed by a slash followed 335 by filespec1. */ 336 { 337 int spec2len, len; 338 339 spec2len = strlen(filespec2); 340 len = spec2len + (filespec1 ? strlen(filespec1) : 0); 341 342 if(filespec2 && filespec2[spec2len - 1] == '/') 343 { 344 spec2len--; 345 len--; 346 } 347 merged = OPENSSL_malloc(len + 2); 348 if(!merged) 349 { 350 DSOerr(DSO_F_DLFCN_MERGER, 351 ERR_R_MALLOC_FAILURE); 352 return(NULL); 353 } 354 strcpy(merged, filespec2); 355 merged[spec2len] = '/'; 356 strcpy(&merged[spec2len + 1], filespec1); 357 } 358 return(merged); 359 } 360 361 #ifdef OPENSSL_SYS_MACOSX 362 #define DSO_ext ".dylib" 363 #define DSO_extlen 6 364 #else 365 #define DSO_ext ".so" 366 #define DSO_extlen 3 367 #endif 368 369 370 static char *dlfcn_name_converter(DSO *dso, const char *filename) 371 { 372 char *translated; 373 int len, rsize, transform; 374 375 len = strlen(filename); 376 rsize = len + 1; 377 transform = (strstr(filename, "/") == NULL); 378 if(transform) 379 { 380 /* We will convert this to "%s.so" or "lib%s.so" etc */ 381 rsize += DSO_extlen; /* The length of ".so" */ 382 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0) 383 rsize += 3; /* The length of "lib" */ 384 } 385 translated = OPENSSL_malloc(rsize); 386 if(translated == NULL) 387 { 388 DSOerr(DSO_F_DLFCN_NAME_CONVERTER, 389 DSO_R_NAME_TRANSLATION_FAILED); 390 return(NULL); 391 } 392 if(transform) 393 { 394 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0) 395 sprintf(translated, "lib%s" DSO_ext, filename); 396 else 397 sprintf(translated, "%s" DSO_ext, filename); 398 } 399 else 400 sprintf(translated, "%s", filename); 401 return(translated); 402 } 403 404 #ifdef __sgi 405 /* 406 This is a quote from IRIX manual for dladdr(3c): 407 408 <dlfcn.h> does not contain a prototype for dladdr or definition of 409 Dl_info. The #include <dlfcn.h> in the SYNOPSIS line is traditional, 410 but contains no dladdr prototype and no IRIX library contains an 411 implementation. Write your own declaration based on the code below. 412 413 The following code is dependent on internal interfaces that are not 414 part of the IRIX compatibility guarantee; however, there is no future 415 intention to change this interface, so on a practical level, the code 416 below is safe to use on IRIX. 417 */ 418 #include <rld_interface.h> 419 #ifndef _RLD_INTERFACE_DLFCN_H_DLADDR 420 #define _RLD_INTERFACE_DLFCN_H_DLADDR 421 typedef struct Dl_info { 422 const char * dli_fname; 423 void * dli_fbase; 424 const char * dli_sname; 425 void * dli_saddr; 426 int dli_version; 427 int dli_reserved1; 428 long dli_reserved[4]; 429 } Dl_info; 430 #else 431 typedef struct Dl_info Dl_info; 432 #endif 433 #define _RLD_DLADDR 14 434 435 static int dladdr(void *address, Dl_info *dl) 436 { 437 void *v; 438 v = _rld_new_interface(_RLD_DLADDR,address,dl); 439 return (int)v; 440 } 441 #endif /* __sgi */ 442 443 static int dlfcn_pathbyaddr(void *addr,char *path,int sz) 444 { 445 #ifdef HAVE_DLINFO 446 Dl_info dli; 447 int len; 448 449 if (addr == NULL) 450 { 451 union { int(*f)(void*,char*,int); void *p; } t = 452 { dlfcn_pathbyaddr }; 453 addr = t.p; 454 } 455 456 if (dladdr(addr,&dli)) 457 { 458 len = (int)strlen(dli.dli_fname); 459 if (sz <= 0) return len+1; 460 if (len >= sz) len=sz-1; 461 memcpy(path,dli.dli_fname,len); 462 path[len++]=0; 463 return len; 464 } 465 466 ERR_add_error_data(4, "dlfcn_pathbyaddr(): ", dlerror()); 467 #endif 468 return -1; 469 } 470 471 static void *dlfcn_globallookup(const char *name) 472 { 473 void *ret = NULL,*handle = dlopen(NULL,RTLD_LAZY); 474 475 if (handle) 476 { 477 ret = dlsym(handle,name); 478 dlclose(handle); 479 } 480 481 return ret; 482 } 483 #endif /* DSO_DLFCN */ 484
