dso_dl.c revision 280304
1/* dso_dl.c -*- mode:C; c-file-style: "eay" -*- */ 2/* 3 * Written by Richard Levitte (richard@levitte.org) 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 "cryptlib.h" 62#include <openssl/dso.h> 63 64#ifndef DSO_DL 65DSO_METHOD *DSO_METHOD_dl(void) 66{ 67 return NULL; 68} 69#else 70 71# include <dl.h> 72 73/* Part of the hack in "dl_load" ... */ 74# define DSO_MAX_TRANSLATED_SIZE 256 75 76static int dl_load(DSO *dso); 77static int dl_unload(DSO *dso); 78static void *dl_bind_var(DSO *dso, const char *symname); 79static DSO_FUNC_TYPE dl_bind_func(DSO *dso, const char *symname); 80# if 0 81static int dl_unbind_var(DSO *dso, char *symname, void *symptr); 82static int dl_unbind_func(DSO *dso, char *symname, DSO_FUNC_TYPE symptr); 83static int dl_init(DSO *dso); 84static int dl_finish(DSO *dso); 85static int dl_ctrl(DSO *dso, int cmd, long larg, void *parg); 86# endif 87static char *dl_name_converter(DSO *dso, const char *filename); 88static char *dl_merger(DSO *dso, const char *filespec1, 89 const char *filespec2); 90static int dl_pathbyaddr(void *addr, char *path, int sz); 91static void *dl_globallookup(const char *name); 92 93static DSO_METHOD dso_meth_dl = { 94 "OpenSSL 'dl' shared library method", 95 dl_load, 96 dl_unload, 97 dl_bind_var, 98 dl_bind_func, 99/* For now, "unbind" doesn't exist */ 100# if 0 101 NULL, /* unbind_var */ 102 NULL, /* unbind_func */ 103# endif 104 NULL, /* ctrl */ 105 dl_name_converter, 106 dl_merger, 107 NULL, /* init */ 108 NULL, /* finish */ 109 dl_pathbyaddr, 110 dl_globallookup 111}; 112 113DSO_METHOD *DSO_METHOD_dl(void) 114{ 115 return (&dso_meth_dl); 116} 117 118/* 119 * For this DSO_METHOD, our meth_data STACK will contain; (i) the handle 120 * (shl_t) returned from shl_load(). NB: I checked on HPUX11 and shl_t is 121 * itself a pointer type so the cast is safe. 122 */ 123 124static int dl_load(DSO *dso) 125{ 126 shl_t ptr = NULL; 127 /* 128 * We don't do any fancy retries or anything, just take the method's (or 129 * DSO's if it has the callback set) best translation of the 130 * platform-independant filename and try once with that. 131 */ 132 char *filename = DSO_convert_filename(dso, NULL); 133 134 if (filename == NULL) { 135 DSOerr(DSO_F_DL_LOAD, DSO_R_NO_FILENAME); 136 goto err; 137 } 138 ptr = shl_load(filename, BIND_IMMEDIATE | 139 (dso->flags & DSO_FLAG_NO_NAME_TRANSLATION ? 0 : 140 DYNAMIC_PATH), 0L); 141 if (ptr == NULL) { 142 DSOerr(DSO_F_DL_LOAD, DSO_R_LOAD_FAILED); 143 ERR_add_error_data(4, "filename(", filename, "): ", strerror(errno)); 144 goto err; 145 } 146 if (!sk_push(dso->meth_data, (char *)ptr)) { 147 DSOerr(DSO_F_DL_LOAD, DSO_R_STACK_ERROR); 148 goto err; 149 } 150 /* 151 * Success, stick the converted filename we've loaded under into the DSO 152 * (it also serves as the indicator that we are currently loaded). 153 */ 154 dso->loaded_filename = filename; 155 return (1); 156 err: 157 /* Cleanup! */ 158 if (filename != NULL) 159 OPENSSL_free(filename); 160 if (ptr != NULL) 161 shl_unload(ptr); 162 return (0); 163} 164 165static int dl_unload(DSO *dso) 166{ 167 shl_t ptr; 168 if (dso == NULL) { 169 DSOerr(DSO_F_DL_UNLOAD, ERR_R_PASSED_NULL_PARAMETER); 170 return (0); 171 } 172 if (sk_num(dso->meth_data) < 1) 173 return (1); 174 /* Is this statement legal? */ 175 ptr = (shl_t) sk_pop(dso->meth_data); 176 if (ptr == NULL) { 177 DSOerr(DSO_F_DL_UNLOAD, DSO_R_NULL_HANDLE); 178 /* 179 * Should push the value back onto the stack in case of a retry. 180 */ 181 sk_push(dso->meth_data, (char *)ptr); 182 return (0); 183 } 184 shl_unload(ptr); 185 return (1); 186} 187 188static void *dl_bind_var(DSO *dso, const char *symname) 189{ 190 shl_t ptr; 191 void *sym; 192 193 if ((dso == NULL) || (symname == NULL)) { 194 DSOerr(DSO_F_DL_BIND_VAR, ERR_R_PASSED_NULL_PARAMETER); 195 return (NULL); 196 } 197 if (sk_num(dso->meth_data) < 1) { 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 DSOerr(DSO_F_DL_BIND_VAR, DSO_R_NULL_HANDLE); 204 return (NULL); 205 } 206 if (shl_findsym(&ptr, symname, TYPE_UNDEFINED, &sym) < 0) { 207 DSOerr(DSO_F_DL_BIND_VAR, DSO_R_SYM_FAILURE); 208 ERR_add_error_data(4, "symname(", symname, "): ", strerror(errno)); 209 return (NULL); 210 } 211 return (sym); 212} 213 214static DSO_FUNC_TYPE dl_bind_func(DSO *dso, const char *symname) 215{ 216 shl_t ptr; 217 void *sym; 218 219 if ((dso == NULL) || (symname == NULL)) { 220 DSOerr(DSO_F_DL_BIND_FUNC, ERR_R_PASSED_NULL_PARAMETER); 221 return (NULL); 222 } 223 if (sk_num(dso->meth_data) < 1) { 224 DSOerr(DSO_F_DL_BIND_FUNC, DSO_R_STACK_ERROR); 225 return (NULL); 226 } 227 ptr = (shl_t) sk_value(dso->meth_data, sk_num(dso->meth_data) - 1); 228 if (ptr == NULL) { 229 DSOerr(DSO_F_DL_BIND_FUNC, DSO_R_NULL_HANDLE); 230 return (NULL); 231 } 232 if (shl_findsym(&ptr, symname, TYPE_UNDEFINED, &sym) < 0) { 233 DSOerr(DSO_F_DL_BIND_FUNC, DSO_R_SYM_FAILURE); 234 ERR_add_error_data(4, "symname(", symname, "): ", strerror(errno)); 235 return (NULL); 236 } 237 return ((DSO_FUNC_TYPE)sym); 238} 239 240static char *dl_merger(DSO *dso, const char *filespec1, const char *filespec2) 241{ 242 char *merged; 243 244 if (!filespec1 && !filespec2) { 245 DSOerr(DSO_F_DL_MERGER, ERR_R_PASSED_NULL_PARAMETER); 246 return (NULL); 247 } 248 /* 249 * If the first file specification is a rooted path, it rules. same goes 250 * if the second file specification is missing. 251 */ 252 if (!filespec2 || filespec1[0] == '/') { 253 merged = OPENSSL_malloc(strlen(filespec1) + 1); 254 if (!merged) { 255 DSOerr(DSO_F_DL_MERGER, ERR_R_MALLOC_FAILURE); 256 return (NULL); 257 } 258 strcpy(merged, filespec1); 259 } 260 /* 261 * If the first file specification is missing, the second one rules. 262 */ 263 else if (!filespec1) { 264 merged = OPENSSL_malloc(strlen(filespec2) + 1); 265 if (!merged) { 266 DSOerr(DSO_F_DL_MERGER, ERR_R_MALLOC_FAILURE); 267 return (NULL); 268 } 269 strcpy(merged, filespec2); 270 } else 271 /* 272 * This part isn't as trivial as it looks. It assumes that the 273 * second file specification really is a directory, and makes no 274 * checks whatsoever. Therefore, the result becomes the 275 * concatenation of filespec2 followed by a slash followed by 276 * filespec1. 277 */ 278 { 279 int spec2len, len; 280 281 spec2len = (filespec2 ? strlen(filespec2) : 0); 282 len = spec2len + (filespec1 ? strlen(filespec1) : 0); 283 284 if (filespec2 && filespec2[spec2len - 1] == '/') { 285 spec2len--; 286 len--; 287 } 288 merged = OPENSSL_malloc(len + 2); 289 if (!merged) { 290 DSOerr(DSO_F_DL_MERGER, ERR_R_MALLOC_FAILURE); 291 return (NULL); 292 } 293 strcpy(merged, filespec2); 294 merged[spec2len] = '/'; 295 strcpy(&merged[spec2len + 1], filespec1); 296 } 297 return (merged); 298} 299 300/* 301 * This function is identical to the one in dso_dlfcn.c, but as it is highly 302 * unlikely that both the "dl" *and* "dlfcn" variants are being compiled at 303 * the same time, there's no great duplicating the code. Figuring out an 304 * elegant way to share one copy of the code would be more difficult and 305 * would not leave the implementations independant. 306 */ 307# if defined(__hpux) 308static const char extension[] = ".sl"; 309# else 310static const char extension[] = ".so"; 311# endif 312static char *dl_name_converter(DSO *dso, const char *filename) 313{ 314 char *translated; 315 int len, rsize, transform; 316 317 len = strlen(filename); 318 rsize = len + 1; 319 transform = (strstr(filename, "/") == NULL); 320 { 321 /* We will convert this to "%s.s?" or "lib%s.s?" */ 322 rsize += strlen(extension); /* The length of ".s?" */ 323 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0) 324 rsize += 3; /* The length of "lib" */ 325 } 326 translated = OPENSSL_malloc(rsize); 327 if (translated == NULL) { 328 DSOerr(DSO_F_DL_NAME_CONVERTER, DSO_R_NAME_TRANSLATION_FAILED); 329 return (NULL); 330 } 331 if (transform) { 332 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0) 333 sprintf(translated, "lib%s%s", filename, extension); 334 else 335 sprintf(translated, "%s%s", filename, extension); 336 } else 337 sprintf(translated, "%s", filename); 338 return (translated); 339} 340 341static int dl_pathbyaddr(void *addr, char *path, int sz) 342{ 343 struct shl_descriptor inf; 344 int i, len; 345 346 if (addr == NULL) { 347 union { 348 int (*f) (void *, char *, int); 349 void *p; 350 } t = { 351 dl_pathbyaddr 352 }; 353 addr = t.p; 354 } 355 356 for (i = -1; shl_get_r(i, &inf) == 0; i++) { 357 if (((size_t)addr >= inf.tstart && (size_t)addr < inf.tend) || 358 ((size_t)addr >= inf.dstart && (size_t)addr < inf.dend)) { 359 len = (int)strlen(inf.filename); 360 if (sz <= 0) 361 return len + 1; 362 if (len >= sz) 363 len = sz - 1; 364 memcpy(path, inf.filename, len); 365 path[len++] = 0; 366 return len; 367 } 368 } 369 370 return -1; 371} 372 373static void *dl_globallookup(const char *name) 374{ 375 void *ret; 376 shl_t h = NULL; 377 378 return shl_findsym(&h, name, TYPE_UNDEFINED, &ret) ? NULL : ret; 379} 380#endif /* DSO_DL */ 381