release/src/router/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 static int dl_pathbyaddr(void *addr,char *path,int sz);
  89 static void *dl_globallookup(const char *name);
  90
  91 static DSO_METHOD dso_meth_dl = {
  92         "OpenSSL 'dl' shared library method",
  93         dl_load,
  94         dl_unload,
  95         dl_bind_var,
  96         dl_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         dl_name_converter,
 104         dl_merger,
 105         NULL, /* init */
 106         NULL, /* finish */
 107         dl_pathbyaddr,
 108         dl_globallookup
 109         };
 110
 111 DSO_METHOD *DSO_METHOD_dl(void)
 112         {
 113         return(&dso_meth_dl);
 114         }
 115
 116 /* For this DSO_METHOD, our meth_data STACK will contain;
 117  * (i) the handle (shl_t) returned from shl_load().
 118  * NB: I checked on HPUX11 and shl_t is itself a pointer
 119  * type so the cast is safe.
 120  */
 121
 122 static int dl_load(DSO *dso)
 123         {
 124         shl_t ptr = NULL;
 125         /* We don't do any fancy retries or anything, just take the method's
 126          * (or DSO's if it has the callback set) best translation of the
 127          * platform-independant filename and try once with that. */
 128         char *filename= DSO_convert_filename(dso, NULL);
 129
 130         if(filename == NULL)
 131                 {
 132                 DSOerr(DSO_F_DL_LOAD,DSO_R_NO_FILENAME);
 133                 goto err;
 134                 }
 135         ptr = shl_load(filename, BIND_IMMEDIATE |
 136                 (dso->flags&DSO_FLAG_NO_NAME_TRANSLATION?0:DYNAMIC_PATH), 0L);
 137         if(ptr == NULL)
 138                 {
 139                 DSOerr(DSO_F_DL_LOAD,DSO_R_LOAD_FAILED);
 140                 ERR_add_error_data(4, "filename(", filename, "): ",
 141                         strerror(errno));
 142                 goto err;
 143                 }
 144         if(!sk_push(dso->meth_data, (char *)ptr))
 145                 {
 146                 DSOerr(DSO_F_DL_LOAD,DSO_R_STACK_ERROR);
 147                 goto err;
 148                 }
 149         /* Success, stick the converted filename we've loaded under into the DSO
 150          * (it also serves as the indicator that we are currently loaded). */
 151         dso->loaded_filename = filename;
 152         return(1);
 153 err:
 154         /* Cleanup! */
 155         if(filename != NULL)
 156                 OPENSSL_free(filename);
 157         if(ptr != NULL)
 158                 shl_unload(ptr);
 159         return(0);
 160         }
 161
 162 static int dl_unload(DSO *dso)
 163         {
 164         shl_t ptr;
 165         if(dso == NULL)
 166                 {
 167                 DSOerr(DSO_F_DL_UNLOAD,ERR_R_PASSED_NULL_PARAMETER);
 168                 return(0);
 169                 }
 170         if(sk_num(dso->meth_data) < 1)
 171                 return(1);
 172         /* Is this statement legal? */
 173         ptr = (shl_t)sk_pop(dso->meth_data);
 174         if(ptr == NULL)
 175                 {
 176                 DSOerr(DSO_F_DL_UNLOAD,DSO_R_NULL_HANDLE);
 177                 /* Should push the value back onto the stack in
 178                  * case of a retry. */
 179                 sk_push(dso->meth_data, (char *)ptr);
 180                 return(0);
 181                 }
 182         shl_unload(ptr);
 183         return(1);
 184         }
 185
 186 static void *dl_bind_var(DSO *dso, const char *symname)
 187         {
 188         shl_t ptr;
 189         void *sym;
 190
 191         if((dso == NULL) || (symname == NULL))
 192                 {
 193                 DSOerr(DSO_F_DL_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER);
 194                 return(NULL);
 195                 }
 196         if(sk_num(dso->meth_data) < 1)
 197                 {
 198                 DSOerr(DSO_F_DL_BIND_VAR,DSO_R_STACK_ERROR);
 199                 return(NULL);
 200                 }
 201         ptr = (shl_t)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
 202         if(ptr == NULL)
 203                 {
 204                 DSOerr(DSO_F_DL_BIND_VAR,DSO_R_NULL_HANDLE);
 205                 return(NULL);
 206                 }
 207         if (shl_findsym(&ptr, symname, TYPE_UNDEFINED, &sym) < 0)
 208                 {
 209                 DSOerr(DSO_F_DL_BIND_VAR,DSO_R_SYM_FAILURE);
 210                 ERR_add_error_data(4, "symname(", symname, "): ",
 211                         strerror(errno));
 212                 return(NULL);
 213                 }
 214         return(sym);
 215         }
 216
 217 static DSO_FUNC_TYPE dl_bind_func(DSO *dso, const char *symname)
 218         {
 219         shl_t ptr;
 220         void *sym;
 221
 222         if((dso == NULL) || (symname == NULL))
 223                 {
 224                 DSOerr(DSO_F_DL_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER);
 225                 return(NULL);
 226                 }
 227         if(sk_num(dso->meth_data) < 1)
 228                 {
 229                 DSOerr(DSO_F_DL_BIND_FUNC,DSO_R_STACK_ERROR);
 230                 return(NULL);
 231                 }
 232         ptr = (shl_t)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
 233         if(ptr == NULL)
 234                 {
 235                 DSOerr(DSO_F_DL_BIND_FUNC,DSO_R_NULL_HANDLE);
 236                 return(NULL);
 237                 }
 238         if (shl_findsym(&ptr, symname, TYPE_UNDEFINED, &sym) < 0)
 239                 {
 240                 DSOerr(DSO_F_DL_BIND_FUNC,DSO_R_SYM_FAILURE);
 241                 ERR_add_error_data(4, "symname(", symname, "): ",
 242                         strerror(errno));
 243                 return(NULL);
 244                 }
 245         return((DSO_FUNC_TYPE)sym);
 246         }
 247
 248 static char *dl_merger(DSO *dso, const char *filespec1, const char *filespec2)
 249         {
 250         char *merged;
 251
 252         if(!filespec1 && !filespec2)
 253                 {
 254                 DSOerr(DSO_F_DL_MERGER,
 255                                 ERR_R_PASSED_NULL_PARAMETER);
 256                 return(NULL);
 257                 }
 258         /* If the first file specification is a rooted path, it rules.
 259            same goes if the second file specification is missing. */
 260         if (!filespec2 || filespec1[0] == '/')
 261                 {
 262                 merged = OPENSSL_malloc(strlen(filespec1) + 1);
 263                 if(!merged)
 264                         {
 265                         DSOerr(DSO_F_DL_MERGER,
 266                                 ERR_R_MALLOC_FAILURE);
 267                         return(NULL);
 268                         }
 269                 strcpy(merged, filespec1);
 270                 }
 271         /* If the first file specification is missing, the second one rules. */
 272         else if (!filespec1)
 273                 {
 274                 merged = OPENSSL_malloc(strlen(filespec2) + 1);
 275                 if(!merged)
 276                         {
 277                         DSOerr(DSO_F_DL_MERGER,
 278                                 ERR_R_MALLOC_FAILURE);
 279                         return(NULL);
 280                         }
 281                 strcpy(merged, filespec2);
 282                 }
 283         else
 284                 /* This part isn't as trivial as it looks.  It assumes that
 285                    the second file specification really is a directory, and
 286                    makes no checks whatsoever.  Therefore, the result becomes
 287                    the concatenation of filespec2 followed by a slash followed
 288                    by filespec1. */
 289                 {
 290                 int spec2len, len;
 291
 292                 spec2len = (filespec2 ? strlen(filespec2) : 0);
 293                 len = spec2len + (filespec1 ? strlen(filespec1) : 0);
 294
 295                 if(filespec2 && filespec2[spec2len - 1] == '/')
 296                         {
 297                         spec2len--;
 298                         len--;
 299                         }
 300                 merged = OPENSSL_malloc(len + 2);
 301                 if(!merged)
 302                         {
 303                         DSOerr(DSO_F_DL_MERGER,
 304                                 ERR_R_MALLOC_FAILURE);
 305                         return(NULL);
 306                         }
 307                 strcpy(merged, filespec2);
 308                 merged[spec2len] = '/';
 309                 strcpy(&merged[spec2len + 1], filespec1);
 310                 }
 311         return(merged);
 312         }
 313
 314 /* This function is identical to the one in dso_dlfcn.c, but as it is highly
 315  * unlikely that both the "dl" *and* "dlfcn" variants are being compiled at the
 316  * same time, there's no great duplicating the code. Figuring out an elegant
 317  * way to share one copy of the code would be more difficult and would not
 318  * leave the implementations independant. */
 319 #if defined(__hpux)
 320 static const char extension[] = ".sl";
 321 #else
 322 static const char extension[] = ".so";
 323 #endif
 324 static char *dl_name_converter(DSO *dso, const char *filename)
 325         {
 326         char *translated;
 327         int len, rsize, transform;
 328
 329         len = strlen(filename);
 330         rsize = len + 1;
 331         transform = (strstr(filename, "/") == NULL);
 332                 {
 333                 /* We will convert this to "%s.s?" or "lib%s.s?" */
 334                 rsize += strlen(extension);/* The length of ".s?" */
 335                 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
 336                         rsize += 3; /* The length of "lib" */
 337                 }
 338         translated = OPENSSL_malloc(rsize);
 339         if(translated == NULL)
 340                 {
 341                 DSOerr(DSO_F_DL_NAME_CONVERTER,
 342                                 DSO_R_NAME_TRANSLATION_FAILED);
 343                 return(NULL);
 344                 }
 345         if(transform)
 346                 {
 347                 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
 348                         sprintf(translated, "lib%s%s", filename, extension);
 349                 else
 350                         sprintf(translated, "%s%s", filename, extension);
 351                 }
 352         else
 353                 sprintf(translated, "%s", filename);
 354         return(translated);
 355         }
 356
 357 static int dl_pathbyaddr(void *addr,char *path,int sz)
 358         {
 359         struct shl_descriptor inf;
 360         int i,len;
 361
 362         if (addr == NULL)
 363                 {
 364                 union   { int(*f)(void*,char*,int); void *p; } t =
 365                         { dl_pathbyaddr };
 366                 addr = t.p;
 367                 }
 368
 369         for (i=-1;shl_get_r(i,&inf)==0;i++)
 370                 {
 371                 if (((size_t)addr >= inf.tstart && (size_t)addr < inf.tend) ||
 372                     ((size_t)addr >= inf.dstart && (size_t)addr < inf.dend))
 373                         {
 374                         len = (int)strlen(inf.filename);
 375                         if (sz <= 0) return len+1;
 376                         if (len >= sz) len=sz-1;
 377                         memcpy(path,inf.filename,len);
 378                         path[len++] = 0;
 379                         return len;
 380                         }
 381                 }
 382
 383         return -1;
 384         }
 385
 386 static void *dl_globallookup(const char *name)
 387         {
 388         void *ret;
 389         shl_t h = NULL;
 390
 391         return shl_findsym(&h,name,TYPE_UNDEFINED,&ret) ? NULL : ret;
 392         }
 393 #endif /* DSO_DL */