1/* dso_dlfcn.c */ 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 64DSO_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 77static int dlfcn_load(DSO *dso); 78static int dlfcn_unload(DSO *dso); 79static void *dlfcn_bind_var(DSO *dso, const char *symname); 80static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname); 81#if 0 82static int dlfcn_unbind(DSO *dso, char *symname, void *symptr); 83static int dlfcn_init(DSO *dso); 84static int dlfcn_finish(DSO *dso); 85static long dlfcn_ctrl(DSO *dso, int cmd, long larg, void *parg); 86#endif 87static char *dlfcn_name_converter(DSO *dso, const char *filename); 88 89static DSO_METHOD dso_meth_dlfcn = { 90 "OpenSSL 'dlfcn' shared library method", 91 dlfcn_load, 92 dlfcn_unload, 93 dlfcn_bind_var, 94 dlfcn_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 dlfcn_name_converter, 102 NULL, /* init */ 103 NULL /* finish */ 104 }; 105 106DSO_METHOD *DSO_METHOD_dlfcn(void) 107 { 108 return(&dso_meth_dlfcn); 109 } 110 111/* Prior to using the dlopen() function, we should decide on the flag 112 * we send. There's a few different ways of doing this and it's a 113 * messy venn-diagram to match up which platforms support what. So 114 * as we don't have autoconf yet, I'm implementing a hack that could 115 * be hacked further relatively easily to deal with cases as we find 116 * them. Initially this is to cope with OpenBSD. */ 117#if defined(__OpenBSD__) || defined(__NetBSD__) 118# ifdef DL_LAZY 119# define DLOPEN_FLAG DL_LAZY 120# else 121# ifdef RTLD_NOW 122# define DLOPEN_FLAG RTLD_NOW 123# else 124# define DLOPEN_FLAG 0 125# endif 126# endif 127#else 128# ifdef OPENSSL_SYS_SUNOS 129# define DLOPEN_FLAG 1 130# else 131# define DLOPEN_FLAG RTLD_NOW /* Hope this works everywhere else */ 132# endif 133#endif 134 135/* For this DSO_METHOD, our meth_data STACK will contain; 136 * (i) the handle (void*) returned from dlopen(). 137 */ 138 139static int dlfcn_load(DSO *dso) 140 { 141 void *ptr = NULL; 142 /* See applicable comments in dso_dl.c */ 143 char *filename = DSO_convert_filename(dso, NULL); 144 145 if(filename == NULL) 146 { 147 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_NO_FILENAME); 148 goto err; 149 } 150 ptr = dlopen(filename, DLOPEN_FLAG); 151 if(ptr == NULL) 152 { 153 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_LOAD_FAILED); 154 ERR_add_error_data(4, "filename(", filename, "): ", dlerror()); 155 goto err; 156 } 157 if(!sk_push(dso->meth_data, (char *)ptr)) 158 { 159 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_STACK_ERROR); 160 goto err; 161 } 162 /* Success */ 163 dso->loaded_filename = filename; 164 return(1); 165err: 166 /* Cleanup! */ 167 if(filename != NULL) 168 OPENSSL_free(filename); 169 if(ptr != NULL) 170 dlclose(ptr); 171 return(0); 172} 173 174static int dlfcn_unload(DSO *dso) 175 { 176 void *ptr; 177 if(dso == NULL) 178 { 179 DSOerr(DSO_F_DLFCN_UNLOAD,ERR_R_PASSED_NULL_PARAMETER); 180 return(0); 181 } 182 if(sk_num(dso->meth_data) < 1) 183 return(1); 184 ptr = (void *)sk_pop(dso->meth_data); 185 if(ptr == NULL) 186 { 187 DSOerr(DSO_F_DLFCN_UNLOAD,DSO_R_NULL_HANDLE); 188 /* Should push the value back onto the stack in 189 * case of a retry. */ 190 sk_push(dso->meth_data, (char *)ptr); 191 return(0); 192 } 193 /* For now I'm not aware of any errors associated with dlclose() */ 194 dlclose(ptr); 195 return(1); 196 } 197 198static void *dlfcn_bind_var(DSO *dso, const char *symname) 199 { 200 void *ptr, *sym; 201 202 if((dso == NULL) || (symname == NULL)) 203 { 204 DSOerr(DSO_F_DLFCN_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER); 205 return(NULL); 206 } 207 if(sk_num(dso->meth_data) < 1) 208 { 209 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_STACK_ERROR); 210 return(NULL); 211 } 212 ptr = (void *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1); 213 if(ptr == NULL) 214 { 215 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_NULL_HANDLE); 216 return(NULL); 217 } 218 sym = dlsym(ptr, symname); 219 if(sym == NULL) 220 { 221 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_SYM_FAILURE); 222 ERR_add_error_data(4, "symname(", symname, "): ", dlerror()); 223 return(NULL); 224 } 225 return(sym); 226 } 227 228static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname) 229 { 230 void *ptr; 231 DSO_FUNC_TYPE sym; 232 233 if((dso == NULL) || (symname == NULL)) 234 { 235 DSOerr(DSO_F_DLFCN_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER); 236 return(NULL); 237 } 238 if(sk_num(dso->meth_data) < 1) 239 { 240 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_STACK_ERROR); 241 return(NULL); 242 } 243 ptr = (void *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1); 244 if(ptr == NULL) 245 { 246 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_NULL_HANDLE); 247 return(NULL); 248 } 249 sym = (DSO_FUNC_TYPE)dlsym(ptr, symname); 250 if(sym == NULL) 251 { 252 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_SYM_FAILURE); 253 ERR_add_error_data(4, "symname(", symname, "): ", dlerror()); 254 return(NULL); 255 } 256 return(sym); 257 } 258 259static char *dlfcn_name_converter(DSO *dso, const char *filename) 260 { 261 char *translated; 262 int len, rsize, transform; 263 264 len = strlen(filename); 265 rsize = len + 1; 266 transform = (strstr(filename, "/") == NULL); 267 if(transform) 268 { 269 /* We will convert this to "%s.so" or "lib%s.so" */ 270 rsize += 3; /* The length of ".so" */ 271 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0) 272 rsize += 3; /* The length of "lib" */ 273 } 274 translated = OPENSSL_malloc(rsize); 275 if(translated == NULL) 276 { 277 DSOerr(DSO_F_DLFCN_NAME_CONVERTER, 278 DSO_R_NAME_TRANSLATION_FAILED); 279 return(NULL); 280 } 281 if(transform) 282 { 283 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0) 284 sprintf(translated, "lib%s.so", filename); 285 else 286 sprintf(translated, "%s.so", filename); 287 } 288 else 289 sprintf(translated, "%s", filename); 290 return(translated); 291 } 292 293#endif /* DSO_DLFCN */ 294