crypto/dso/dso_win32.c

   1 /* dso_win32.c -*- mode:C; c-file-style: "eay" -*- */
   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 <string.h>
  61 #include "cryptlib.h"
  62 #include <openssl/dso.h>
  63
  64 #if !defined(DSO_WIN32)
  65 DSO_METHOD *DSO_METHOD_win32(void)
  66         {
  67         return NULL;
  68         }
  69 #else
  70
  71 /* Part of the hack in "win32_load" ... */
  72 #define DSO_MAX_TRANSLATED_SIZE 256
  73
  74 static int win32_load(DSO *dso);
  75 static int win32_unload(DSO *dso);
  76 static void *win32_bind_var(DSO *dso, const char *symname);
  77 static DSO_FUNC_TYPE win32_bind_func(DSO *dso, const char *symname);
  78 #if 0
  79 static int win32_unbind_var(DSO *dso, char *symname, void *symptr);
  80 static int win32_unbind_func(DSO *dso, char *symname, DSO_FUNC_TYPE symptr);
  81 static int win32_init(DSO *dso);
  82 static int win32_finish(DSO *dso);
  83 static long win32_ctrl(DSO *dso, int cmd, long larg, void *parg);
  84 #endif
  85 static char *win32_name_converter(DSO *dso, const char *filename);
  86 static char *win32_merger(DSO *dso, const char *filespec1,
  87         const char *filespec2);
  88 static int win32_pathbyaddr(void *addr,char *path,int sz);
  89
  90 static const char *openssl_strnchr(const char *string, int c, size_t len);
  91
  92 static DSO_METHOD dso_meth_win32 = {
  93         "OpenSSL 'win32' shared library method",
  94         win32_load,
  95         win32_unload,
  96         win32_bind_var,
  97         win32_bind_func,
  98 /* For now, "unbind" doesn't exist */
  99 #if 0
 100         NULL, /* unbind_var */
 101         NULL, /* unbind_func */
 102 #endif
 103         NULL, /* ctrl */
 104         win32_name_converter,
 105         win32_merger,
 106         NULL, /* init */
 107         NULL, /* finish */
 108         win32_pathbyaddr
 109         };
 110
 111 DSO_METHOD *DSO_METHOD_win32(void)
 112         {
 113         return(&dso_meth_win32);
 114         }
 115
 116 /* For this DSO_METHOD, our meth_data STACK will contain;
 117  * (i) a pointer to the handle (HINSTANCE) returned from
 118  *     LoadLibrary(), and copied.
 119  */
 120
 121 static int win32_load(DSO *dso)
 122         {
 123         HINSTANCE h = NULL, *p = NULL;
 124         /* See applicable comments from dso_dl.c */
 125         char *filename = DSO_convert_filename(dso, NULL);
 126
 127         if(filename == NULL)
 128                 {
 129                 DSOerr(DSO_F_WIN32_LOAD,DSO_R_NO_FILENAME);
 130                 goto err;
 131                 }
 132         h = LoadLibraryA(filename);
 133         if(h == NULL)
 134                 {
 135                 DSOerr(DSO_F_WIN32_LOAD,DSO_R_LOAD_FAILED);
 136                 ERR_add_error_data(3, "filename(", filename, ")");
 137                 goto err;
 138                 }
 139         p = (HINSTANCE *)OPENSSL_malloc(sizeof(HINSTANCE));
 140         if(p == NULL)
 141                 {
 142                 DSOerr(DSO_F_WIN32_LOAD,ERR_R_MALLOC_FAILURE);
 143                 goto err;
 144                 }
 145         *p = h;
 146         if(!sk_push(dso->meth_data, (char *)p))
 147                 {
 148                 DSOerr(DSO_F_WIN32_LOAD,DSO_R_STACK_ERROR);
 149                 goto err;
 150                 }
 151         /* Success */
 152         dso->loaded_filename = filename;
 153         return(1);
 154 err:
 155         /* Cleanup !*/
 156         if(filename != NULL)
 157                 OPENSSL_free(filename);
 158         if(p != NULL)
 159                 OPENSSL_free(p);
 160         if(h != NULL)
 161                 FreeLibrary(h);
 162         return(0);
 163         }
 164
 165 static int win32_unload(DSO *dso)
 166         {
 167         HINSTANCE *p;
 168         if(dso == NULL)
 169                 {
 170                 DSOerr(DSO_F_WIN32_UNLOAD,ERR_R_PASSED_NULL_PARAMETER);
 171                 return(0);
 172                 }
 173         if(sk_num(dso->meth_data) < 1)
 174                 return(1);
 175         p = (HINSTANCE *)sk_pop(dso->meth_data);
 176         if(p == NULL)
 177                 {
 178                 DSOerr(DSO_F_WIN32_UNLOAD,DSO_R_NULL_HANDLE);
 179                 return(0);
 180                 }
 181         if(!FreeLibrary(*p))
 182                 {
 183                 DSOerr(DSO_F_WIN32_UNLOAD,DSO_R_UNLOAD_FAILED);
 184                 /* We should push the value back onto the stack in
 185                  * case of a retry. */
 186                 sk_push(dso->meth_data, (char *)p);
 187                 return(0);
 188                 }
 189         /* Cleanup */
 190         OPENSSL_free(p);
 191         return(1);
 192         }
 193
 194 /* Using GetProcAddress for variables? TODO: Check this out in
 195  * the Win32 API docs, there's probably a variant for variables. */
 196 static void *win32_bind_var(DSO *dso, const char *symname)
 197         {
 198         HINSTANCE *ptr;
 199         void *sym;
 200
 201         if((dso == NULL) || (symname == NULL))
 202                 {
 203                 DSOerr(DSO_F_WIN32_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER);
 204                 return(NULL);
 205                 }
 206         if(sk_num(dso->meth_data) < 1)
 207                 {
 208                 DSOerr(DSO_F_WIN32_BIND_VAR,DSO_R_STACK_ERROR);
 209                 return(NULL);
 210                 }
 211         ptr = (HINSTANCE *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
 212         if(ptr == NULL)
 213                 {
 214                 DSOerr(DSO_F_WIN32_BIND_VAR,DSO_R_NULL_HANDLE);
 215                 return(NULL);
 216                 }
 217         sym = GetProcAddress(*ptr, symname);
 218         if(sym == NULL)
 219                 {
 220                 DSOerr(DSO_F_WIN32_BIND_VAR,DSO_R_SYM_FAILURE);
 221                 ERR_add_error_data(3, "symname(", symname, ")");
 222                 return(NULL);
 223                 }
 224         return(sym);
 225         }
 226
 227 static DSO_FUNC_TYPE win32_bind_func(DSO *dso, const char *symname)
 228         {
 229         HINSTANCE *ptr;
 230         void *sym;
 231
 232         if((dso == NULL) || (symname == NULL))
 233                 {
 234                 DSOerr(DSO_F_WIN32_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER);
 235                 return(NULL);
 236                 }
 237         if(sk_num(dso->meth_data) < 1)
 238                 {
 239                 DSOerr(DSO_F_WIN32_BIND_FUNC,DSO_R_STACK_ERROR);
 240                 return(NULL);
 241                 }
 242         ptr = (HINSTANCE *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
 243         if(ptr == NULL)
 244                 {
 245                 DSOerr(DSO_F_WIN32_BIND_FUNC,DSO_R_NULL_HANDLE);
 246                 return(NULL);
 247                 }
 248         sym = GetProcAddress(*ptr, symname);
 249         if(sym == NULL)
 250                 {
 251                 DSOerr(DSO_F_WIN32_BIND_FUNC,DSO_R_SYM_FAILURE);
 252                 ERR_add_error_data(3, "symname(", symname, ")");
 253                 return(NULL);
 254                 }
 255         return((DSO_FUNC_TYPE)sym);
 256         }
 257
 258 struct file_st
 259         {
 260         const char *node; int nodelen;
 261         const char *device; int devicelen;
 262         const char *predir; int predirlen;
 263         const char *dir; int dirlen;
 264         const char *file; int filelen;
 265         };
 266
 267 static struct file_st *win32_splitter(DSO *dso, const char *filename,
 268         int assume_last_is_dir)
 269         {
 270         struct file_st *result = NULL;
 271         enum { IN_NODE, IN_DEVICE, IN_FILE } position;
 272         const char *start = filename;
 273
 274         if (!filename)
 275                 {
 276                 DSOerr(DSO_F_WIN32_SPLITTER,DSO_R_NO_FILENAME);
 277                 /*goto err;*/
 278                 return(NULL);
 279                 }
 280
 281         result = OPENSSL_malloc(sizeof(struct file_st));
 282         if(result == NULL)
 283                 {
 284                 DSOerr(DSO_F_WIN32_SPLITTER,
 285                         ERR_R_MALLOC_FAILURE);
 286                 return(NULL);
 287                 }
 288
 289         memset(result, 0, sizeof(struct file_st));
 290         position = IN_DEVICE;
 291
 292         if(filename[0] == '\\' && filename[1] == '\\'
 293                 || filename[0] == '/' && filename[1] == '/')
 294                 {
 295                 position = IN_NODE;
 296                 filename += 2;
 297                 start = filename;
 298                 result->node = start;
 299                 }
 300
 301         do
 302                 {
 303                 switch(filename[0])
 304                         {
 305                 case ':':
 306                         if(position != IN_DEVICE)
 307                                 {
 308                                 DSOerr(DSO_F_WIN32_SPLITTER,
 309                                         DSO_R_INCORRECT_FILE_SYNTAX);
 310                                 /*goto err;*/
 311                                 return(NULL);
 312                                 }
 313                         result->device = start;
 314                         result->devicelen = filename - start;
 315                         position = IN_FILE;
 316                         start = ++filename;
 317                         result->dir = start;
 318                         break;
 319                 case '\\':
 320                 case '/':
 321                         if(position == IN_NODE)
 322                                 {
 323                                 result->nodelen = filename - start;
 324                                 position = IN_FILE;
 325                                 start = ++filename;
 326                                 result->dir = start;
 327                                 }
 328                         else
 329                                 {
 330                                 filename++;
 331                                 result->dirlen += filename - start;
 332                                 }
 333                         break;
 334                 case '\0':
 335                         if(position == IN_NODE)
 336                                 {
 337                                 result->nodelen = filename - start;
 338                                 }
 339                         else
 340                                 {
 341                                 if(filename - start > 0)
 342                                         {
 343                                         if (assume_last_is_dir)
 344                                                 {
 345                                                 result->devicelen += filename - start;
 346                                                 }
 347                                         else
 348                                                 {
 349                                                 result->file = start;
 350                                                 result->filelen = filename - start;
 351                                                 }
 352                                         }
 353                                 }
 354                         break;
 355                 default:
 356                         filename++;
 357                         break;
 358                         }
 359                 }
 360         while(*filename);
 361
 362         if(!result->nodelen) result->node = NULL;
 363         if(!result->devicelen) result->device = NULL;
 364         if(!result->dirlen) result->dir = NULL;
 365         if(!result->filelen) result->file = NULL;
 366
 367         return(result);
 368         }
 369
 370 static char *win32_joiner(DSO *dso, const struct file_st *file_split)
 371         {
 372         int len = 0, offset = 0;
 373         char *result = NULL;
 374         const char *start;
 375
 376         if(!file_split)
 377                 {
 378                 DSOerr(DSO_F_WIN32_JOINER,
 379                                 ERR_R_PASSED_NULL_PARAMETER);
 380                 return(NULL);
 381                 }
 382         if(file_split->node)
 383                 {
 384                 len += 2 + file_split->nodelen; /* 2 for starting \\ */
 385                 if(file_split->predir || file_split->dir || file_split->file)
 386                         len++;  /* 1 for ending \ */
 387                 }
 388         else if(file_split->device)
 389                 {
 390                 len += file_split->devicelen + 1; /* 1 for ending : */
 391                 }
 392         len += file_split->predirlen;
 393         if(file_split->predir && (file_split->dir || file_split->file))
 394                 {
 395                 len++;  /* 1 for ending \ */
 396                 }
 397         len += file_split->dirlen;
 398         if(file_split->dir && file_split->file)
 399                 {
 400                 len++;  /* 1 for ending \ */
 401                 }
 402         len += file_split->filelen;
 403
 404         if(!len)
 405                 {
 406                 DSOerr(DSO_F_WIN32_JOINER, DSO_R_EMPTY_FILE_STRUCTURE);
 407                 return(NULL);
 408                 }
 409
 410         result = OPENSSL_malloc(len + 1);
 411         if (!result)
 412                 {
 413                 DSOerr(DSO_F_WIN32_JOINER,
 414                         ERR_R_MALLOC_FAILURE);
 415                 return(NULL);
 416                 }
 417
 418         if(file_split->node)
 419                 {
 420                 strcpy(&result[offset], "\\\\"); offset += 2;
 421                 strncpy(&result[offset], file_split->node,
 422                         file_split->nodelen); offset += file_split->nodelen;
 423                 if(file_split->predir || file_split->dir || file_split->file)
 424                         {
 425                         result[offset] = '\\'; offset++;
 426                         }
 427                 }
 428         else if(file_split->device)
 429                 {
 430                 strncpy(&result[offset], file_split->device,
 431                         file_split->devicelen); offset += file_split->devicelen;
 432                 result[offset] = ':'; offset++;
 433                 }
 434         start = file_split->predir;
 435         while(file_split->predirlen > (start - file_split->predir))
 436                 {
 437                 const char *end = openssl_strnchr(start, '/',
 438                         file_split->predirlen - (start - file_split->predir));
 439                 if(!end)
 440                         end = start
 441                                 + file_split->predirlen
 442                                 - (start - file_split->predir);
 443                 strncpy(&result[offset], start,
 444                         end - start); offset += end - start;
 445                 result[offset] = '\\'; offset++;
 446                 start = end + 1;
 447                 }
 448         if(file_split->predir && (file_split->dir || file_split->file))
 449                 {
 450                 result[offset] = '\\'; offset++;
 451                 }
 452         start = file_split->dir;
 453         while(file_split->dirlen > (start - file_split->dir))
 454                 {
 455                 const char *end = openssl_strnchr(start, '/',
 456                         file_split->dirlen - (start - file_split->dir));
 457                 if(!end)
 458                         end = start
 459                                 + file_split->dirlen
 460                                 - (start - file_split->dir);
 461                 strncpy(&result[offset], start,
 462                         end - start); offset += end - start;
 463                 result[offset] = '\\'; offset++;
 464                 start = end + 1;
 465                 }
 466         if(file_split->dir && file_split->file)
 467                 {
 468                 result[offset] = '\\'; offset++;
 469                 }
 470         strncpy(&result[offset], file_split->file,
 471                 file_split->filelen); offset += file_split->filelen;
 472         result[offset] = '\0';
 473         return(result);
 474         }
 475
 476 static char *win32_merger(DSO *dso, const char *filespec1, const char *filespec2)
 477         {
 478         char *merged = NULL;
 479         struct file_st *filespec1_split = NULL;
 480         struct file_st *filespec2_split = NULL;
 481
 482         if(!filespec1 && !filespec2)
 483                 {
 484                 DSOerr(DSO_F_WIN32_MERGER,
 485                                 ERR_R_PASSED_NULL_PARAMETER);
 486                 return(NULL);
 487                 }
 488         if (!filespec2)
 489                 {
 490                 merged = OPENSSL_malloc(strlen(filespec1) + 1);
 491                 if(!merged)
 492                         {
 493                         DSOerr(DSO_F_WIN32_MERGER,
 494                                 ERR_R_MALLOC_FAILURE);
 495                         return(NULL);
 496                         }
 497                 strcpy(merged, filespec1);
 498                 }
 499         else if (!filespec1)
 500                 {
 501                 merged = OPENSSL_malloc(strlen(filespec2) + 1);
 502                 if(!merged)
 503                         {
 504                         DSOerr(DSO_F_WIN32_MERGER,
 505                                 ERR_R_MALLOC_FAILURE);
 506                         return(NULL);
 507                         }
 508                 strcpy(merged, filespec2);
 509                 }
 510         else
 511                 {
 512                 filespec1_split = win32_splitter(dso, filespec1, 1);
 513                 if (!filespec1_split)
 514                         {
 515                         DSOerr(DSO_F_WIN32_MERGER,
 516                                 ERR_R_MALLOC_FAILURE);
 517                         return(NULL);
 518                         }
 519                 filespec2_split = win32_splitter(dso, filespec2, 0);
 520                 if (!filespec1_split)
 521                         {
 522                         DSOerr(DSO_F_WIN32_MERGER,
 523                                 ERR_R_MALLOC_FAILURE);
 524                         OPENSSL_free(filespec1_split);
 525                         return(NULL);
 526                         }
 527
 528                 /* Fill in into filespec1_split */
 529                 if (!filespec1_split->node && !filespec1_split->device)
 530                         {
 531                         filespec1_split->node = filespec2_split->node;
 532                         filespec1_split->nodelen = filespec2_split->nodelen;
 533                         filespec1_split->device = filespec2_split->device;
 534                         filespec1_split->devicelen = filespec2_split->devicelen;
 535                         }
 536                 if (!filespec1_split->dir)
 537                         {
 538                         filespec1_split->dir = filespec2_split->dir;
 539                         filespec1_split->dirlen = filespec2_split->dirlen;
 540                         }
 541                 else if (filespec1_split->dir[0] != '\\'
 542                         && filespec1_split->dir[0] != '/')
 543                         {
 544                         filespec1_split->predir = filespec2_split->dir;
 545                         filespec1_split->predirlen = filespec2_split->dirlen;
 546                         }
 547                 if (!filespec1_split->file)
 548                         {
 549                         filespec1_split->file = filespec2_split->file;
 550                         filespec1_split->filelen = filespec2_split->filelen;
 551                         }
 552
 553                 merged = win32_joiner(dso, filespec1_split);
 554                 }
 555         return(merged);
 556         }
 557
 558 static char *win32_name_converter(DSO *dso, const char *filename)
 559         {
 560         char *translated;
 561         int len, transform;
 562
 563         len = strlen(filename);
 564         transform = ((strstr(filename, "/") == NULL) &&
 565                         (strstr(filename, "\\") == NULL) &&
 566                         (strstr(filename, ":") == NULL));
 567         if(transform)
 568                 /* We will convert this to "%s.dll" */
 569                 translated = OPENSSL_malloc(len + 5);
 570         else
 571                 /* We will simply duplicate filename */
 572                 translated = OPENSSL_malloc(len + 1);
 573         if(translated == NULL)
 574                 {
 575                 DSOerr(DSO_F_WIN32_NAME_CONVERTER,
 576                                 DSO_R_NAME_TRANSLATION_FAILED);
 577                 return(NULL);
 578                 }
 579         if(transform)
 580                 sprintf(translated, "%s.dll", filename);
 581         else
 582                 sprintf(translated, "%s", filename);
 583         return(translated);
 584         }
 585
 586 static const char *openssl_strnchr(const char *string, int c, size_t len)
 587         {
 588         size_t i;
 589         const char *p;
 590         for (i = 0, p = string; i < len && *p; i++, p++)
 591                 {
 592                 if (*p == c)
 593                         return p;
 594                 }
 595         return NULL;
 596         }
 597
 598 #include <tlhelp32.h>
 599 #ifdef _WIN32_WCE
 600 # if _WIN32_WCE < 300
 601 static FARPROC GetProcAddressA(HMODULE hModule,LPCSTR lpProcName)
 602         {
 603         WCHAR lpProcNameW[64];
 604         int i;
 605
 606         for (i=0;lpProcName[i] && i<64;i++)
 607                 lpProcNameW[i] = (WCHAR)lpProcName[i];
 608         if (i==64) return NULL;
 609         lpProcNameW[i] = 0;
 610
 611         return GetProcAddressW(hModule,lpProcNameW);
 612         }
 613 # endif
 614 # undef GetProcAddress
 615 # define GetProcAddress GetProcAddressA
 616 # define DLLNAME "TOOLHELP.DLL"
 617 #else
 618 # ifdef MODULEENTRY32
 619 # undef MODULEENTRY32   /* unmask the ASCII version! */
 620 # endif
 621 # define DLLNAME "KERNEL32.DLL"
 622 #endif
 623
 624 typedef HANDLE (WINAPI *CREATETOOLHELP32SNAPSHOT)(DWORD, DWORD);
 625 typedef BOOL (WINAPI *CLOSETOOLHELP32SNAPSHOT)(HANDLE);
 626 typedef BOOL (WINAPI *MODULE32)(HANDLE, MODULEENTRY32 *);
 627
 628 static int win32_pathbyaddr(void *addr,char *path,int sz)
 629         {
 630         HMODULE dll;
 631         HANDLE hModuleSnap = INVALID_HANDLE_VALUE;
 632         MODULEENTRY32 me32;
 633         CREATETOOLHELP32SNAPSHOT create_snap;
 634         CLOSETOOLHELP32SNAPSHOT  close_snap;
 635         MODULE32 module_first, module_next;
 636         int len;
 637
 638         if (addr == NULL) addr = win32_pathbyaddr;
 639
 640         dll = LoadLibrary(TEXT(DLLNAME));
 641         if (dll == NULL)
 642                 {
 643                 DSOerr(DSO_F_PATHBYADDR,DSO_R_UNSUPPORTED);
 644                 return -1;
 645                 }
 646
 647         create_snap = (CREATETOOLHELP32SNAPSHOT)
 648                 GetProcAddress(dll,"CreateToolhelp32Snapshot");
 649         if (create_snap == NULL)
 650                 {
 651                 DSOerr(DSO_F_PATHBYADDR,DSO_R_UNSUPPORTED);
 652                 return -1;
 653                 }
 654         /* We take the rest for granted... */
 655 #ifdef _WIN32_WCE
 656         close_snap = (CLOSETOOLHELP32SNAPSHOT)
 657                 GetProcAddress(dll,"CloseToolhelp32Snapshot");
 658 #else
 659         close_snap = (CLOSETOOLHELP32SNAPSHOT)CloseHandle;
 660 #endif
 661         module_first = (MODULE32)GetProcAddress(dll,"Module32First");
 662         module_next  = (MODULE32)GetProcAddress(dll,"Module32Next");
 663
 664         hModuleSnap = (*create_snap)(TH32CS_SNAPMODULE,0);
 665         if( hModuleSnap == INVALID_HANDLE_VALUE )
 666                 {
 667                 FreeLibrary(dll);
 668                 DSOerr(DSO_F_PATHBYADDR,DSO_R_UNSUPPORTED);
 669                 return -1;
 670                 }
 671
 672         me32.dwSize = sizeof(me32);
 673
 674         if(!(*module_first)(hModuleSnap,&me32))
 675                 {
 676                 (*close_snap)(hModuleSnap);
 677                 FreeLibrary(dll);
 678                 DSOerr(DSO_F_PATHBYADDR,DSO_R_FAILURE);
 679                 return -1;
 680                 }
 681
 682         do      {
 683                 if ((BYTE *)addr >= me32.modBaseAddr &&
 684                     (BYTE *)addr <  me32.modBaseAddr+me32.modBaseSize)
 685                         {
 686                         (*close_snap)(hModuleSnap);
 687                         FreeLibrary(dll);
 688 #ifdef _WIN32_WCE
 689 # if _WIN32_WCE >= 101
 690                         return WideCharToMultiByte(CP_ACP,0,me32.szExePath,-1,
 691                                                         path,sz,NULL,NULL);
 692 # else
 693                         len = (int)wcslen(me32.szExePath);
 694                         if (sz <= 0) return len+1;
 695                         if (len >= sz) len=sz-1;
 696                         for(i=0;i<len;i++)
 697                                 path[i] = (char)me32.szExePath[i];
 698                         path[len++] = 0;
 699                         return len;
 700 # endif
 701 #else
 702                         len = (int)strlen(me32.szExePath);
 703                         if (sz <= 0) return len+1;
 704                         if (len >= sz) len=sz-1;
 705                         memcpy(path,me32.szExePath,len);
 706                         path[len++] = 0;
 707                         return len;
 708 #endif
 709                         }
 710                 } while((*module_next)(hModuleSnap, &me32));
 711
 712         (*close_snap)(hModuleSnap);
 713         FreeLibrary(dll);
 714         return 0;
 715         }
 716 #endif /* DSO_WIN32 */