1 /* dso_dl.c -*- mode:C; c-file-style: "eay" -*- */ 2 /* Written by Richard Levitte (richard (at) levitte.org) 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 #include <stdio.h> 60 #include "cryptlib.h" 61 #include <openssl/dso.h> 62 63 #ifndef DSO_DL 64 DSO_METHOD *DSO_METHOD_dl(void) 65 { 66 return NULL; 67 } 68 #else 69 70 #include <dl.h> 71 72 /* Part of the hack in "dl_load" ... */ 73 #define DSO_MAX_TRANSLATED_SIZE 256 74 75 static int dl_load(DSO *dso); 76 static int dl_unload(DSO *dso); 77 static void *dl_bind_var(DSO *dso, const char *symname); 78 static DSO_FUNC_TYPE dl_bind_func(DSO *dso, const char *symname); 79 #if 0 80 static int dl_unbind_var(DSO *dso, char *symname, void *symptr); 81 static int dl_unbind_func(DSO *dso, char *symname, DSO_FUNC_TYPE symptr); 82 static int dl_init(DSO *dso); 83 static int dl_finish(DSO *dso); 84 static int dl_ctrl(DSO *dso, int cmd, long larg, void *parg); 85 #endif 86 static char *dl_name_converter(DSO *dso, const char *filename); 87 static char *dl_merger(DSO *dso, const char *filespec1, const char *filespec2); 88 static int dl_pathbyaddr(void *addr,char *path,int sz); 89 static void *dl_globallookup(const char *name); 90 91 static DSO_METHOD dso_meth_dl = { 92 "OpenSSL 'dl' shared library method", 93 dl_load, 94 dl_unload, 95 dl_bind_var, 96 dl_bind_func, 97 /* For now, "unbind" doesn't exist */ 98 #if 0 99 NULL, /* unbind_var */ 100 NULL, /* unbind_func */ 101 #endif 102 NULL, /* ctrl */ 103 dl_name_converter, 104 dl_merger, 105 NULL, /* init */ 106 NULL, /* finish */ 107 dl_pathbyaddr, 108 dl_globallookup 109 }; 110 111 DSO_METHOD *DSO_METHOD_dl(void) 112 { 113 return(&dso_meth_dl); 114 } 115 116 /* For this DSO_METHOD, our meth_data STACK will contain; 117 * (i) the handle (shl_t) returned from shl_load(). 118 * NB: I checked on HPUX11 and shl_t is itself a pointer 119 * type so the cast is safe. 120 */ 121 122 static int dl_load(DSO *dso) 123 { 124 shl_t ptr = NULL; 125 /* We don't do any fancy retries or anything, just take the method's 126 * (or DSO's if it has the callback set) best translation of the 127 * platform-independant filename and try once with that. */ 128 char *filename= DSO_convert_filename(dso, NULL); 129 130 if(filename == NULL) 131 { 132 DSOerr(DSO_F_DL_LOAD,DSO_R_NO_FILENAME); 133 goto err; 134 } 135 ptr = shl_load(filename, BIND_IMMEDIATE | 136 (dso->flags&DSO_FLAG_NO_NAME_TRANSLATION?0:DYNAMIC_PATH), 0L); 137 if(ptr == NULL) 138 { 139 DSOerr(DSO_F_DL_LOAD,DSO_R_LOAD_FAILED); 140 ERR_add_error_data(4, "filename(", filename, "): ", 141 strerror(errno)); 142 goto err; 143 } 144 if(!sk_push(dso->meth_data, (char *)ptr)) 145 { 146 DSOerr(DSO_F_DL_LOAD,DSO_R_STACK_ERROR); 147 goto err; 148 } 149 /* Success, stick the converted filename we've loaded under into the DSO 150 * (it also serves as the indicator that we are currently loaded). */ 151 dso->loaded_filename = filename; 152 return(1); 153 err: 154 /* Cleanup! */ 155 if(filename != NULL) 156 OPENSSL_free(filename); 157 if(ptr != NULL) 158 shl_unload(ptr); 159 return(0); 160 } 161 162 static int dl_unload(DSO *dso) 163 { 164 shl_t ptr; 165 if(dso == NULL) 166 { 167 DSOerr(DSO_F_DL_UNLOAD,ERR_R_PASSED_NULL_PARAMETER); 168 return(0); 169 } 170 if(sk_num(dso->meth_data) < 1) 171 return(1); 172 /* Is this statement legal? */ 173 ptr = (shl_t)sk_pop(dso->meth_data); 174 if(ptr == NULL) 175 { 176 DSOerr(DSO_F_DL_UNLOAD,DSO_R_NULL_HANDLE); 177 /* Should push the value back onto the stack in 178 * case of a retry. */ 179 sk_push(dso->meth_data, (char *)ptr); 180 return(0); 181 } 182 shl_unload(ptr); 183 return(1); 184 } 185 186 static void *dl_bind_var(DSO *dso, const char *symname) 187 { 188 shl_t ptr; 189 void *sym; 190 191 if((dso == NULL) || (symname == NULL)) 192 { 193 DSOerr(DSO_F_DL_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER); 194 return(NULL); 195 } 196 if(sk_num(dso->meth_data) < 1) 197 { 198 DSOerr(DSO_F_DL_BIND_VAR,DSO_R_STACK_ERROR); 199 return(NULL); 200 } 201 ptr = (shl_t)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1); 202 if(ptr == NULL) 203 { 204 DSOerr(DSO_F_DL_BIND_VAR,DSO_R_NULL_HANDLE); 205 return(NULL); 206 } 207 if (shl_findsym(&ptr, symname, TYPE_UNDEFINED, &sym) < 0) 208 { 209 DSOerr(DSO_F_DL_BIND_VAR,DSO_R_SYM_FAILURE); 210 ERR_add_error_data(4, "symname(", symname, "): ", 211 strerror(errno)); 212 return(NULL); 213 } 214 return(sym); 215 } 216 217 static DSO_FUNC_TYPE dl_bind_func(DSO *dso, const char *symname) 218 { 219 shl_t ptr; 220 void *sym; 221 222 if((dso == NULL) || (symname == NULL)) 223 { 224 DSOerr(DSO_F_DL_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER); 225 return(NULL); 226 } 227 if(sk_num(dso->meth_data) < 1) 228 { 229 DSOerr(DSO_F_DL_BIND_FUNC,DSO_R_STACK_ERROR); 230 return(NULL); 231 } 232 ptr = (shl_t)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1); 233 if(ptr == NULL) 234 { 235 DSOerr(DSO_F_DL_BIND_FUNC,DSO_R_NULL_HANDLE); 236 return(NULL); 237 } 238 if (shl_findsym(&ptr, symname, TYPE_UNDEFINED, &sym) < 0) 239 { 240 DSOerr(DSO_F_DL_BIND_FUNC,DSO_R_SYM_FAILURE); 241 ERR_add_error_data(4, "symname(", symname, "): ", 242 strerror(errno)); 243 return(NULL); 244 } 245 return((DSO_FUNC_TYPE)sym); 246 } 247 248 static char *dl_merger(DSO *dso, const char *filespec1, const char *filespec2) 249 { 250 char *merged; 251 252 if(!filespec1 && !filespec2) 253 { 254 DSOerr(DSO_F_DL_MERGER, 255 ERR_R_PASSED_NULL_PARAMETER); 256 return(NULL); 257 } 258 /* If the first file specification is a rooted path, it rules. 259 same goes if the second file specification is missing. */ 260 if (!filespec2 || filespec1[0] == '/') 261 { 262 merged = OPENSSL_malloc(strlen(filespec1) + 1); 263 if(!merged) 264 { 265 DSOerr(DSO_F_DL_MERGER, 266 ERR_R_MALLOC_FAILURE); 267 return(NULL); 268 } 269 strcpy(merged, filespec1); 270 } 271 /* If the first file specification is missing, the second one rules. */ 272 else if (!filespec1) 273 { 274 merged = OPENSSL_malloc(strlen(filespec2) + 1); 275 if(!merged) 276 { 277 DSOerr(DSO_F_DL_MERGER, 278 ERR_R_MALLOC_FAILURE); 279 return(NULL); 280 } 281 strcpy(merged, filespec2); 282 } 283 else 284 /* This part isn't as trivial as it looks. It assumes that 285 the second file specification really is a directory, and 286 makes no checks whatsoever. Therefore, the result becomes 287 the concatenation of filespec2 followed by a slash followed 288 by filespec1. */ 289 { 290 int spec2len, len; 291 292 spec2len = (filespec2 ? strlen(filespec2) : 0); 293 len = spec2len + (filespec1 ? strlen(filespec1) : 0); 294 295 if(filespec2 && filespec2[spec2len - 1] == '/') 296 { 297 spec2len--; 298 len--; 299 } 300 merged = OPENSSL_malloc(len + 2); 301 if(!merged) 302 { 303 DSOerr(DSO_F_DL_MERGER, 304 ERR_R_MALLOC_FAILURE); 305 return(NULL); 306 } 307 strcpy(merged, filespec2); 308 merged[spec2len] = '/'; 309 strcpy(&merged[spec2len + 1], filespec1); 310 } 311 return(merged); 312 } 313 314 /* This function is identical to the one in dso_dlfcn.c, but as it is highly 315 * unlikely that both the "dl" *and* "dlfcn" variants are being compiled at the 316 * same time, there's no great duplicating the code. Figuring out an elegant 317 * way to share one copy of the code would be more difficult and would not 318 * leave the implementations independant. */ 319 #if defined(__hpux) 320 static const char extension[] = ".sl"; 321 #else 322 static const char extension[] = ".so"; 323 #endif 324 static char *dl_name_converter(DSO *dso, const char *filename) 325 { 326 char *translated; 327 int len, rsize, transform; 328 329 len = strlen(filename); 330 rsize = len + 1; 331 transform = (strstr(filename, "/") == NULL); 332 { 333 /* We will convert this to "%s.s?" or "lib%s.s?" */ 334 rsize += strlen(extension);/* The length of ".s?" */ 335 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0) 336 rsize += 3; /* The length of "lib" */ 337 } 338 translated = OPENSSL_malloc(rsize); 339 if(translated == NULL) 340 { 341 DSOerr(DSO_F_DL_NAME_CONVERTER, 342 DSO_R_NAME_TRANSLATION_FAILED); 343 return(NULL); 344 } 345 if(transform) 346 { 347 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0) 348 sprintf(translated, "lib%s%s", filename, extension); 349 else 350 sprintf(translated, "%s%s", filename, extension); 351 } 352 else 353 sprintf(translated, "%s", filename); 354 return(translated); 355 } 356 357 static int dl_pathbyaddr(void *addr,char *path,int sz) 358 { 359 struct shl_descriptor inf; 360 int i,len; 361 362 if (addr == NULL) 363 { 364 union { int(*f)(void*,char*,int); void *p; } t = 365 { dl_pathbyaddr }; 366 addr = t.p; 367 } 368 369 for (i=-1;shl_get_r(i,&inf)==0;i++) 370 { 371 if (((size_t)addr >= inf.tstart && (size_t)addr < inf.tend) || 372 ((size_t)addr >= inf.dstart && (size_t)addr < inf.dend)) 373 { 374 len = (int)strlen(inf.filename); 375 if (sz <= 0) return len+1; 376 if (len >= sz) len=sz-1; 377 memcpy(path,inf.filename,len); 378 path[len++] = 0; 379 return len; 380 } 381 } 382 383 return -1; 384 } 385 386 static void *dl_globallookup(const char *name) 387 { 388 void *ret; 389 shl_t h = NULL; 390 391 return shl_findsym(&h,name,TYPE_UNDEFINED,&ret) ? NULL : ret; 392 } 393 #endif /* DSO_DL */ 394
