dso_dl.c revision 160814
1/* dso_dl.c -*- mode:C; c-file-style: "eay" -*- */ 2/* Written by Richard Levitte (richard@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@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_DL 64DSO_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 75static int dl_load(DSO *dso); 76static int dl_unload(DSO *dso); 77static void *dl_bind_var(DSO *dso, const char *symname); 78static DSO_FUNC_TYPE dl_bind_func(DSO *dso, const char *symname); 79#if 0 80static int dl_unbind_var(DSO *dso, char *symname, void *symptr); 81static int dl_unbind_func(DSO *dso, char *symname, DSO_FUNC_TYPE symptr); 82static int dl_init(DSO *dso); 83static int dl_finish(DSO *dso); 84static int dl_ctrl(DSO *dso, int cmd, long larg, void *parg); 85#endif 86static char *dl_name_converter(DSO *dso, const char *filename); 87static char *dl_merger(DSO *dso, const char *filespec1, const char *filespec2); 88 89static DSO_METHOD dso_meth_dl = { 90 "OpenSSL 'dl' shared library method", 91 dl_load, 92 dl_unload, 93 dl_bind_var, 94 dl_bind_func, 95/* For now, "unbind" doesn't exist */ 96#if 0 97 NULL, /* unbind_var */ 98 NULL, /* unbind_func */ 99#endif 100 NULL, /* ctrl */ 101 dl_name_converter, 102 dl_merger, 103 NULL, /* init */ 104 NULL /* finish */ 105 }; 106 107DSO_METHOD *DSO_METHOD_dl(void) 108 { 109 return(&dso_meth_dl); 110 } 111 112/* For this DSO_METHOD, our meth_data STACK will contain; 113 * (i) the handle (shl_t) returned from shl_load(). 114 * NB: I checked on HPUX11 and shl_t is itself a pointer 115 * type so the cast is safe. 116 */ 117 118static int dl_load(DSO *dso) 119 { 120 shl_t ptr = NULL; 121 /* We don't do any fancy retries or anything, just take the method's 122 * (or DSO's if it has the callback set) best translation of the 123 * platform-independant filename and try once with that. */ 124 char *filename= DSO_convert_filename(dso, NULL); 125 126 if(filename == NULL) 127 { 128 DSOerr(DSO_F_DL_LOAD,DSO_R_NO_FILENAME); 129 goto err; 130 } 131 ptr = shl_load(filename, BIND_IMMEDIATE | 132 (dso->flags&DSO_FLAG_NO_NAME_TRANSLATION?0:DYNAMIC_PATH), 0L); 133 if(ptr == NULL) 134 { 135 DSOerr(DSO_F_DL_LOAD,DSO_R_LOAD_FAILED); 136 ERR_add_error_data(4, "filename(", filename, "): ", 137 strerror(errno)); 138 goto err; 139 } 140 if(!sk_push(dso->meth_data, (char *)ptr)) 141 { 142 DSOerr(DSO_F_DL_LOAD,DSO_R_STACK_ERROR); 143 goto err; 144 } 145 /* Success, stick the converted filename we've loaded under into the DSO 146 * (it also serves as the indicator that we are currently loaded). */ 147 dso->loaded_filename = filename; 148 return(1); 149err: 150 /* Cleanup! */ 151 if(filename != NULL) 152 OPENSSL_free(filename); 153 if(ptr != NULL) 154 shl_unload(ptr); 155 return(0); 156 } 157 158static int dl_unload(DSO *dso) 159 { 160 shl_t ptr; 161 if(dso == NULL) 162 { 163 DSOerr(DSO_F_DL_UNLOAD,ERR_R_PASSED_NULL_PARAMETER); 164 return(0); 165 } 166 if(sk_num(dso->meth_data) < 1) 167 return(1); 168 /* Is this statement legal? */ 169 ptr = (shl_t)sk_pop(dso->meth_data); 170 if(ptr == NULL) 171 { 172 DSOerr(DSO_F_DL_UNLOAD,DSO_R_NULL_HANDLE); 173 /* Should push the value back onto the stack in 174 * case of a retry. */ 175 sk_push(dso->meth_data, (char *)ptr); 176 return(0); 177 } 178 shl_unload(ptr); 179 return(1); 180 } 181 182static void *dl_bind_var(DSO *dso, const char *symname) 183 { 184 shl_t ptr; 185 void *sym; 186 187 if((dso == NULL) || (symname == NULL)) 188 { 189 DSOerr(DSO_F_DL_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER); 190 return(NULL); 191 } 192 if(sk_num(dso->meth_data) < 1) 193 { 194 DSOerr(DSO_F_DL_BIND_VAR,DSO_R_STACK_ERROR); 195 return(NULL); 196 } 197 ptr = (shl_t)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1); 198 if(ptr == NULL) 199 { 200 DSOerr(DSO_F_DL_BIND_VAR,DSO_R_NULL_HANDLE); 201 return(NULL); 202 } 203 if (shl_findsym(&ptr, symname, TYPE_UNDEFINED, &sym) < 0) 204 { 205 DSOerr(DSO_F_DL_BIND_VAR,DSO_R_SYM_FAILURE); 206 ERR_add_error_data(4, "symname(", symname, "): ", 207 strerror(errno)); 208 return(NULL); 209 } 210 return(sym); 211 } 212 213static DSO_FUNC_TYPE dl_bind_func(DSO *dso, const char *symname) 214 { 215 shl_t ptr; 216 void *sym; 217 218 if((dso == NULL) || (symname == NULL)) 219 { 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 { 225 DSOerr(DSO_F_DL_BIND_FUNC,DSO_R_STACK_ERROR); 226 return(NULL); 227 } 228 ptr = (shl_t)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1); 229 if(ptr == NULL) 230 { 231 DSOerr(DSO_F_DL_BIND_FUNC,DSO_R_NULL_HANDLE); 232 return(NULL); 233 } 234 if (shl_findsym(&ptr, symname, TYPE_UNDEFINED, &sym) < 0) 235 { 236 DSOerr(DSO_F_DL_BIND_FUNC,DSO_R_SYM_FAILURE); 237 ERR_add_error_data(4, "symname(", symname, "): ", 238 strerror(errno)); 239 return(NULL); 240 } 241 return((DSO_FUNC_TYPE)sym); 242 } 243 244static char *dl_merger(DSO *dso, const char *filespec1, const char *filespec2) 245 { 246 char *merged; 247 248 if(!filespec1 && !filespec2) 249 { 250 DSOerr(DSO_F_DL_MERGER, 251 ERR_R_PASSED_NULL_PARAMETER); 252 return(NULL); 253 } 254 /* If the first file specification is a rooted path, it rules. 255 same goes if the second file specification is missing. */ 256 if (!filespec2 || filespec1[0] == '/') 257 { 258 merged = OPENSSL_malloc(strlen(filespec1) + 1); 259 if(!merged) 260 { 261 DSOerr(DSO_F_DL_MERGER, 262 ERR_R_MALLOC_FAILURE); 263 return(NULL); 264 } 265 strcpy(merged, filespec1); 266 } 267 /* If the first file specification is missing, the second one rules. */ 268 else if (!filespec1) 269 { 270 merged = OPENSSL_malloc(strlen(filespec2) + 1); 271 if(!merged) 272 { 273 DSOerr(DSO_F_DL_MERGER, 274 ERR_R_MALLOC_FAILURE); 275 return(NULL); 276 } 277 strcpy(merged, filespec2); 278 } 279 else 280 /* This part isn't as trivial as it looks. It assumes that 281 the second file specification really is a directory, and 282 makes no checks whatsoever. Therefore, the result becomes 283 the concatenation of filespec2 followed by a slash followed 284 by filespec1. */ 285 { 286 int spec2len, len; 287 288 spec2len = (filespec2 ? strlen(filespec2) : 0); 289 len = spec2len + (filespec1 ? strlen(filespec1) : 0); 290 291 if(filespec2 && filespec2[spec2len - 1] == '/') 292 { 293 spec2len--; 294 len--; 295 } 296 merged = OPENSSL_malloc(len + 2); 297 if(!merged) 298 { 299 DSOerr(DSO_F_DL_MERGER, 300 ERR_R_MALLOC_FAILURE); 301 return(NULL); 302 } 303 strcpy(merged, filespec2); 304 merged[spec2len] = '/'; 305 strcpy(&merged[spec2len + 1], filespec1); 306 } 307 return(merged); 308 } 309 310/* This function is identical to the one in dso_dlfcn.c, but as it is highly 311 * unlikely that both the "dl" *and* "dlfcn" variants are being compiled at the 312 * same time, there's no great duplicating the code. Figuring out an elegant 313 * way to share one copy of the code would be more difficult and would not 314 * leave the implementations independant. */ 315#if defined(__hpux) 316static const char extension[] = ".sl"; 317#else 318static const char extension[] = ".so"; 319#endif 320static char *dl_name_converter(DSO *dso, const char *filename) 321 { 322 char *translated; 323 int len, rsize, transform; 324 325 len = strlen(filename); 326 rsize = len + 1; 327 transform = (strstr(filename, "/") == NULL); 328 { 329 /* We will convert this to "%s.s?" or "lib%s.s?" */ 330 rsize += strlen(extension);/* The length of ".s?" */ 331 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0) 332 rsize += 3; /* The length of "lib" */ 333 } 334 translated = OPENSSL_malloc(rsize); 335 if(translated == NULL) 336 { 337 DSOerr(DSO_F_DL_NAME_CONVERTER, 338 DSO_R_NAME_TRANSLATION_FAILED); 339 return(NULL); 340 } 341 if(transform) 342 { 343 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0) 344 sprintf(translated, "lib%s%s", filename, extension); 345 else 346 sprintf(translated, "%s%s", filename, extension); 347 } 348 else 349 sprintf(translated, "%s", filename); 350 return(translated); 351 } 352 353#endif /* DSO_DL */ 354