| 1 | /* dso_dlfcn.c -*- mode:C; c-file-style: "eay" -*- */ |
| 2 | /* Written by Geoff Thorpe (geoff@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@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@cryptsoft.com). This product includes software written by Tim |
| 55 | * Hudson (tjh@cryptsoft.com). |
| 56 | * |
| 57 | */ |
| 58 | |
| 59 | #include <stdio.h> |
| 60 | #include "cryptlib.h" |
| 61 | #include <openssl/dso.h> |
| 62 | |
| 63 | #ifndef DSO_DLFCN |
| 64 | DSO_METHOD *DSO_METHOD_dlfcn(void) |
| 65 | { |
| 66 | return NULL; |
| 67 | } |
| 68 | #else |
| 69 | |
| 70 | #ifdef HAVE_DLFCN_H |
| 71 | #include <dlfcn.h> |
| 72 | #endif |
| 73 | |
| 74 | /* Part of the hack in "dlfcn_load" ... */ |
| 75 | #define DSO_MAX_TRANSLATED_SIZE 256 |
| 76 | |
| 77 | static int dlfcn_load(DSO *dso); |
| 78 | static int dlfcn_unload(DSO *dso); |
| 79 | static void *dlfcn_bind_var(DSO *dso, const char *symname); |
| 80 | static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname); |
| 81 | #if 0 |
| 82 | static int dlfcn_unbind(DSO *dso, char *symname, void *symptr); |
| 83 | static int dlfcn_init(DSO *dso); |
| 84 | static int dlfcn_finish(DSO *dso); |
| 85 | static long dlfcn_ctrl(DSO *dso, int cmd, long larg, void *parg); |
| 86 | #endif |
| 87 | static char *dlfcn_name_converter(DSO *dso, const char *filename); |
| 88 | static char *dlfcn_merger(DSO *dso, const char *filespec1, |
| 89 | const char *filespec2); |
| 90 | |
| 91 | static DSO_METHOD dso_meth_dlfcn = { |
| 92 | "OpenSSL 'dlfcn' shared library method", |
| 93 | dlfcn_load, |
| 94 | dlfcn_unload, |
| 95 | dlfcn_bind_var, |
| 96 | dlfcn_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 | dlfcn_name_converter, |
| 104 | dlfcn_merger, |
| 105 | NULL, /* init */ |
| 106 | NULL /* finish */ |
| 107 | }; |
| 108 | |
| 109 | DSO_METHOD *DSO_METHOD_dlfcn(void) |
| 110 | { |
| 111 | return(&dso_meth_dlfcn); |
| 112 | } |
| 113 | |
| 114 | /* Prior to using the dlopen() function, we should decide on the flag |
| 115 | * we send. There's a few different ways of doing this and it's a |
| 116 | * messy venn-diagram to match up which platforms support what. So |
| 117 | * as we don't have autoconf yet, I'm implementing a hack that could |
| 118 | * be hacked further relatively easily to deal with cases as we find |
| 119 | * them. Initially this is to cope with OpenBSD. */ |
| 120 | #if defined(__OpenBSD__) || defined(__NetBSD__) |
| 121 | # ifdef DL_LAZY |
| 122 | # define DLOPEN_FLAG DL_LAZY |
| 123 | # else |
| 124 | # ifdef RTLD_NOW |
| 125 | # define DLOPEN_FLAG RTLD_NOW |
| 126 | # else |
| 127 | # define DLOPEN_FLAG 0 |
| 128 | # endif |
| 129 | # endif |
| 130 | #else |
| 131 | # ifdef OPENSSL_SYS_SUNOS |
| 132 | # define DLOPEN_FLAG 1 |
| 133 | # else |
| 134 | # define DLOPEN_FLAG RTLD_NOW /* Hope this works everywhere else */ |
| 135 | # endif |
| 136 | #endif |
| 137 | |
| 138 | /* For this DSO_METHOD, our meth_data STACK will contain; |
| 139 | * (i) the handle (void*) returned from dlopen(). |
| 140 | */ |
| 141 | |
| 142 | static int dlfcn_load(DSO *dso) |
| 143 | { |
| 144 | void *ptr = NULL; |
| 145 | /* See applicable comments in dso_dl.c */ |
| 146 | char *filename = DSO_convert_filename(dso, NULL); |
| 147 | int flags = DLOPEN_FLAG; |
| 148 | |
| 149 | if(filename == NULL) |
| 150 | { |
| 151 | DSOerr(DSO_F_DLFCN_LOAD,DSO_R_NO_FILENAME); |
| 152 | goto err; |
| 153 | } |
| 154 | |
| 155 | #ifdef RTLD_GLOBAL |
| 156 | if (dso->flags & DSO_FLAG_GLOBAL_SYMBOLS) |
| 157 | flags |= RTLD_GLOBAL; |
| 158 | #endif |
| 159 | ptr = dlopen(filename, flags); |
| 160 | if(ptr == NULL) |
| 161 | { |
| 162 | DSOerr(DSO_F_DLFCN_LOAD,DSO_R_LOAD_FAILED); |
| 163 | ERR_add_error_data(4, "filename(", filename, "): ", dlerror()); |
| 164 | goto err; |
| 165 | } |
| 166 | if(!sk_push(dso->meth_data, (char *)ptr)) |
| 167 | { |
| 168 | DSOerr(DSO_F_DLFCN_LOAD,DSO_R_STACK_ERROR); |
| 169 | goto err; |
| 170 | } |
| 171 | /* Success */ |
| 172 | dso->loaded_filename = filename; |
| 173 | return(1); |
| 174 | err: |
| 175 | /* Cleanup! */ |
| 176 | if(filename != NULL) |
| 177 | OPENSSL_free(filename); |
| 178 | if(ptr != NULL) |
| 179 | dlclose(ptr); |
| 180 | return(0); |
| 181 | } |
| 182 | |
| 183 | static int dlfcn_unload(DSO *dso) |
| 184 | { |
| 185 | void *ptr; |
| 186 | if(dso == NULL) |
| 187 | { |
| 188 | DSOerr(DSO_F_DLFCN_UNLOAD,ERR_R_PASSED_NULL_PARAMETER); |
| 189 | return(0); |
| 190 | } |
| 191 | if(sk_num(dso->meth_data) < 1) |
| 192 | return(1); |
| 193 | ptr = (void *)sk_pop(dso->meth_data); |
| 194 | if(ptr == NULL) |
| 195 | { |
| 196 | DSOerr(DSO_F_DLFCN_UNLOAD,DSO_R_NULL_HANDLE); |
| 197 | /* Should push the value back onto the stack in |
| 198 | * case of a retry. */ |
| 199 | sk_push(dso->meth_data, (char *)ptr); |
| 200 | return(0); |
| 201 | } |
| 202 | /* For now I'm not aware of any errors associated with dlclose() */ |
| 203 | dlclose(ptr); |
| 204 | return(1); |
| 205 | } |
| 206 | |
| 207 | static void *dlfcn_bind_var(DSO *dso, const char *symname) |
| 208 | { |
| 209 | void *ptr, *sym; |
| 210 | |
| 211 | if((dso == NULL) || (symname == NULL)) |
| 212 | { |
| 213 | DSOerr(DSO_F_DLFCN_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER); |
| 214 | return(NULL); |
| 215 | } |
| 216 | if(sk_num(dso->meth_data) < 1) |
| 217 | { |
| 218 | DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_STACK_ERROR); |
| 219 | return(NULL); |
| 220 | } |
| 221 | ptr = (void *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1); |
| 222 | if(ptr == NULL) |
| 223 | { |
| 224 | DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_NULL_HANDLE); |
| 225 | return(NULL); |
| 226 | } |
| 227 | sym = dlsym(ptr, symname); |
| 228 | if(sym == NULL) |
| 229 | { |
| 230 | DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_SYM_FAILURE); |
| 231 | ERR_add_error_data(4, "symname(", symname, "): ", dlerror()); |
| 232 | return(NULL); |
| 233 | } |
| 234 | return(sym); |
| 235 | } |
| 236 | |
| 237 | static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname) |
| 238 | { |
| 239 | void *ptr; |
| 240 | DSO_FUNC_TYPE sym, *tsym = &sym; |
| 241 | |
| 242 | if((dso == NULL) || (symname == NULL)) |
| 243 | { |
| 244 | DSOerr(DSO_F_DLFCN_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER); |
| 245 | return(NULL); |
| 246 | } |
| 247 | if(sk_num(dso->meth_data) < 1) |
| 248 | { |
| 249 | DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_STACK_ERROR); |
| 250 | return(NULL); |
| 251 | } |
| 252 | ptr = (void *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1); |
| 253 | if(ptr == NULL) |
| 254 | { |
| 255 | DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_NULL_HANDLE); |
| 256 | return(NULL); |
| 257 | } |
| 258 | *(void **)(tsym) = dlsym(ptr, symname); |
| 259 | if(sym == NULL) |
| 260 | { |
| 261 | DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_SYM_FAILURE); |
| 262 | ERR_add_error_data(4, "symname(", symname, "): ", dlerror()); |
| 263 | return(NULL); |
| 264 | } |
| 265 | return(sym); |
| 266 | } |
| 267 | |
| 268 | static char *dlfcn_merger(DSO *dso, const char *filespec1, |
| 269 | const char *filespec2) |
| 270 | { |
| 271 | char *merged; |
| 272 | |
| 273 | if(!filespec1 && !filespec2) |
| 274 | { |
| 275 | DSOerr(DSO_F_DLFCN_MERGER, |
| 276 | ERR_R_PASSED_NULL_PARAMETER); |
| 277 | return(NULL); |
| 278 | } |
| 279 | /* If the first file specification is a rooted path, it rules. |
| 280 | same goes if the second file specification is missing. */ |
| 281 | if (!filespec2 || filespec1[0] == '/') |
| 282 | { |
| 283 | merged = OPENSSL_malloc(strlen(filespec1) + 1); |
| 284 | if(!merged) |
| 285 | { |
| 286 | DSOerr(DSO_F_DLFCN_MERGER, |
| 287 | ERR_R_MALLOC_FAILURE); |
| 288 | return(NULL); |
| 289 | } |
| 290 | strcpy(merged, filespec1); |
| 291 | } |
| 292 | /* If the first file specification is missing, the second one rules. */ |
| 293 | else if (!filespec1) |
| 294 | { |
| 295 | merged = OPENSSL_malloc(strlen(filespec2) + 1); |
| 296 | if(!merged) |
| 297 | { |
| 298 | DSOerr(DSO_F_DLFCN_MERGER, |
| 299 | ERR_R_MALLOC_FAILURE); |
| 300 | return(NULL); |
| 301 | } |
| 302 | strcpy(merged, filespec2); |
| 303 | } |
| 304 | else |
| 305 | /* This part isn't as trivial as it looks. It assumes that |
| 306 | the second file specification really is a directory, and |
| 307 | makes no checks whatsoever. Therefore, the result becomes |
| 308 | the concatenation of filespec2 followed by a slash followed |
| 309 | by filespec1. */ |
| 310 | { |
| 311 | int spec2len, len; |
| 312 | |
| 313 | spec2len = (filespec2 ? strlen(filespec2) : 0); |
| 314 | len = spec2len + (filespec1 ? strlen(filespec1) : 0); |
| 315 | |
| 316 | if(filespec2 && filespec2[spec2len - 1] == '/') |
| 317 | { |
| 318 | spec2len--; |
| 319 | len--; |
| 320 | } |
| 321 | merged = OPENSSL_malloc(len + 2); |
| 322 | if(!merged) |
| 323 | { |
| 324 | DSOerr(DSO_F_DLFCN_MERGER, |
| 325 | ERR_R_MALLOC_FAILURE); |
| 326 | return(NULL); |
| 327 | } |
| 328 | strcpy(merged, filespec2); |
| 329 | merged[spec2len] = '/'; |
| 330 | strcpy(&merged[spec2len + 1], filespec1); |
| 331 | } |
| 332 | return(merged); |
| 333 | } |
| 334 | |
| 335 | static char *dlfcn_name_converter(DSO *dso, const char *filename) |
| 336 | { |
| 337 | char *translated; |
| 338 | int len, rsize, transform; |
| 339 | |
| 340 | len = strlen(filename); |
| 341 | rsize = len + 1; |
| 342 | transform = (strstr(filename, "/") == NULL); |
| 343 | if(transform) |
| 344 | { |
| 345 | /* We will convert this to "%s.so" or "lib%s.so" */ |
| 346 | rsize += 3; /* The length of ".so" */ |
| 347 | if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0) |
| 348 | rsize += 3; /* The length of "lib" */ |
| 349 | } |
| 350 | translated = OPENSSL_malloc(rsize); |
| 351 | if(translated == NULL) |
| 352 | { |
| 353 | DSOerr(DSO_F_DLFCN_NAME_CONVERTER, |
| 354 | DSO_R_NAME_TRANSLATION_FAILED); |
| 355 | return(NULL); |
| 356 | } |
| 357 | if(transform) |
| 358 | { |
| 359 | if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0) |
| 360 | sprintf(translated, "lib%s.so", filename); |
| 361 | else |
| 362 | sprintf(translated, "%s.so", filename); |
| 363 | } |
| 364 | else |
| 365 | sprintf(translated, "%s", filename); |
| 366 | return(translated); |
| 367 | } |
| 368 | |
| 369 | #endif /* DSO_DLFCN */ |