dso_dl.c revision 111147
1/* dso_dl.c */ 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); 87 88static DSO_METHOD dso_meth_dl = { 89 "OpenSSL 'dl' shared library method", 90 dl_load, 91 dl_unload, 92 dl_bind_var, 93 dl_bind_func, 94/* For now, "unbind" doesn't exist */ 95#if 0 96 NULL, /* unbind_var */ 97 NULL, /* unbind_func */ 98#endif 99 NULL, /* ctrl */ 100 dl_name_converter, 101 NULL, /* init */ 102 NULL /* finish */ 103 }; 104 105DSO_METHOD *DSO_METHOD_dl(void) 106 { 107 return(&dso_meth_dl); 108 } 109 110/* For this DSO_METHOD, our meth_data STACK will contain; 111 * (i) the handle (shl_t) returned from shl_load(). 112 * NB: I checked on HPUX11 and shl_t is itself a pointer 113 * type so the cast is safe. 114 */ 115 116static int dl_load(DSO *dso) 117 { 118 shl_t ptr = NULL; 119 /* We don't do any fancy retries or anything, just take the method's 120 * (or DSO's if it has the callback set) best translation of the 121 * platform-independant filename and try once with that. */ 122 char *filename= DSO_convert_filename(dso, NULL); 123 124 if(filename == NULL) 125 { 126 DSOerr(DSO_F_DL_LOAD,DSO_R_NO_FILENAME); 127 goto err; 128 } 129 ptr = shl_load(filename, BIND_IMMEDIATE|DYNAMIC_PATH, 0L); 130 if(ptr == NULL) 131 { 132 DSOerr(DSO_F_DL_LOAD,DSO_R_LOAD_FAILED); 133 ERR_add_error_data(4, "filename(", filename, "): ", 134 strerror(errno)); 135 goto err; 136 } 137 if(!sk_push(dso->meth_data, (char *)ptr)) 138 { 139 DSOerr(DSO_F_DL_LOAD,DSO_R_STACK_ERROR); 140 goto err; 141 } 142 /* Success, stick the converted filename we've loaded under into the DSO 143 * (it also serves as the indicator that we are currently loaded). */ 144 dso->loaded_filename = filename; 145 return(1); 146err: 147 /* Cleanup! */ 148 if(filename != NULL) 149 OPENSSL_free(filename); 150 if(ptr != NULL) 151 shl_unload(ptr); 152 return(0); 153 } 154 155static int dl_unload(DSO *dso) 156 { 157 shl_t ptr; 158 if(dso == NULL) 159 { 160 DSOerr(DSO_F_DL_UNLOAD,ERR_R_PASSED_NULL_PARAMETER); 161 return(0); 162 } 163 if(sk_num(dso->meth_data) < 1) 164 return(1); 165 /* Is this statement legal? */ 166 ptr = (shl_t)sk_pop(dso->meth_data); 167 if(ptr == NULL) 168 { 169 DSOerr(DSO_F_DL_UNLOAD,DSO_R_NULL_HANDLE); 170 /* Should push the value back onto the stack in 171 * case of a retry. */ 172 sk_push(dso->meth_data, (char *)ptr); 173 return(0); 174 } 175 shl_unload(ptr); 176 return(1); 177 } 178 179static void *dl_bind_var(DSO *dso, const char *symname) 180 { 181 shl_t ptr; 182 void *sym; 183 184 if((dso == NULL) || (symname == NULL)) 185 { 186 DSOerr(DSO_F_DL_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER); 187 return(NULL); 188 } 189 if(sk_num(dso->meth_data) < 1) 190 { 191 DSOerr(DSO_F_DL_BIND_VAR,DSO_R_STACK_ERROR); 192 return(NULL); 193 } 194 ptr = (shl_t)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1); 195 if(ptr == NULL) 196 { 197 DSOerr(DSO_F_DL_BIND_VAR,DSO_R_NULL_HANDLE); 198 return(NULL); 199 } 200 if (shl_findsym(&ptr, symname, TYPE_UNDEFINED, &sym) < 0) 201 { 202 DSOerr(DSO_F_DL_BIND_VAR,DSO_R_SYM_FAILURE); 203 ERR_add_error_data(4, "symname(", symname, "): ", 204 strerror(errno)); 205 return(NULL); 206 } 207 return(sym); 208 } 209 210static DSO_FUNC_TYPE dl_bind_func(DSO *dso, const char *symname) 211 { 212 shl_t ptr; 213 void *sym; 214 215 if((dso == NULL) || (symname == NULL)) 216 { 217 DSOerr(DSO_F_DL_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER); 218 return(NULL); 219 } 220 if(sk_num(dso->meth_data) < 1) 221 { 222 DSOerr(DSO_F_DL_BIND_FUNC,DSO_R_STACK_ERROR); 223 return(NULL); 224 } 225 ptr = (shl_t)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1); 226 if(ptr == NULL) 227 { 228 DSOerr(DSO_F_DL_BIND_FUNC,DSO_R_NULL_HANDLE); 229 return(NULL); 230 } 231 if (shl_findsym(&ptr, symname, TYPE_UNDEFINED, &sym) < 0) 232 { 233 DSOerr(DSO_F_DL_BIND_FUNC,DSO_R_SYM_FAILURE); 234 ERR_add_error_data(4, "symname(", symname, "): ", 235 strerror(errno)); 236 return(NULL); 237 } 238 return((DSO_FUNC_TYPE)sym); 239 } 240 241/* This function is identical to the one in dso_dlfcn.c, but as it is highly 242 * unlikely that both the "dl" *and* "dlfcn" variants are being compiled at the 243 * same time, there's no great duplicating the code. Figuring out an elegant 244 * way to share one copy of the code would be more difficult and would not 245 * leave the implementations independant. */ 246#if defined(__hpux) 247static const char extension[] = ".sl"; 248#else 249static const char extension[] = ".so"; 250#endif 251static char *dl_name_converter(DSO *dso, const char *filename) 252 { 253 char *translated; 254 int len, rsize, transform; 255 256 len = strlen(filename); 257 rsize = len + 1; 258 transform = (strstr(filename, "/") == NULL); 259 { 260 /* We will convert this to "%s.s?" or "lib%s.s?" */ 261 rsize += strlen(extension);/* The length of ".s?" */ 262 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0) 263 rsize += 3; /* The length of "lib" */ 264 } 265 translated = OPENSSL_malloc(rsize); 266 if(translated == NULL) 267 { 268 DSOerr(DSO_F_DL_NAME_CONVERTER, 269 DSO_R_NAME_TRANSLATION_FAILED); 270 return(NULL); 271 } 272 if(transform) 273 { 274 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0) 275 sprintf(translated, "lib%s%s", filename, extension); 276 else 277 sprintf(translated, "%s%s", filename, extension); 278 } 279 else 280 sprintf(translated, "%s", filename); 281 return(translated); 282 } 283 284#endif /* DSO_DL */ 285