crypto/openssl/crypto/dso/dso_dl.c

   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
  64 DSO_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
  75 static int dl_load(DSO *dso);
  76 static int dl_unload(DSO *dso);
  77 static void *dl_bind_var(DSO *dso, const char *symname);
  78 static DSO_FUNC_TYPE dl_bind_func(DSO *dso, const char *symname);
  79 #if 0
  80 static int dl_unbind_var(DSO *dso, char *symname, void *symptr);
  81 static int dl_unbind_func(DSO *dso, char *symname, DSO_FUNC_TYPE symptr);
  82 static int dl_init(DSO *dso);
  83 static int dl_finish(DSO *dso);
  84 static int dl_ctrl(DSO *dso, int cmd, long larg, void *parg);
  85 #endif
  86 static char *dl_name_converter(DSO *dso, const char *filename);
  87 static char *dl_merger(DSO *dso, const char *filespec1, const char *filespec2);
  88
  89 static 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
 107 DSO_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
 118 static 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);
 149 err:
 150         /* Cleanup! */
 151         if(filename != NULL)
 152                 OPENSSL_free(filename);
 153         if(ptr != NULL)
 154                 shl_unload(ptr);
 155         return(0);
 156         }
 157
 158 static 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
 182 static 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
 213 static 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
 244 static 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)
 316 static const char extension[] = ".sl";
 317 #else
 318 static const char extension[] = ".so";
 319 #endif
 320 static 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 */