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 #ifdef _WIN32_WCE
  72 # if _WIN32_WCE < 300
  73 static FARPROC GetProcAddressA(HMODULE hModule,LPCSTR lpProcName)
  74         {
  75         WCHAR lpProcNameW[64];
  76         int i;
  77
  78         for (i=0;lpProcName[i] && i<64;i++)
  79                 lpProcNameW[i] = (WCHAR)lpProcName[i];
  80         if (i==64) return NULL;
  81         lpProcNameW[i] = 0;
  82
  83         return GetProcAddressW(hModule,lpProcNameW);
  84         }
  85 # endif
  86 # undef GetProcAddress
  87 # define GetProcAddress GetProcAddressA
  88
  89 static HINSTANCE LoadLibraryA(LPCSTR *lpLibFileName)
  90         {
  91         WCHAR *fnamw;
  92         size_t len_0=strlen(lpLibFileName)+1,i;
  93
  94 #ifdef _MSC_VER
  95         fname = (WCHAR *)_alloca (len_0*sizeof(WCHAR));
  96 #else
  97         fnamw = (WCHAR *)alloca (len_0*sizeof(WCHAR));
  98 #endif
  99         if (fnamw == NULL)
 100                 {
 101                 SetLastError(ERROR_NOT_ENOUGH_MEMORY);
 102                 return NULL;
 103                 }
 104
 105 #if defined(_WIN32_WCE) && _WIN32_WCE>=101
 106         if (!MultiByteToWideChar(CP_ACP,0,lpLibFileName,len_0,fnamw,len_0))
 107 #endif
 108                 for (i=0;i<len_0;i++) fnamw[i]=(WCHAR)lpLibFileName[i];
 109
 110         return LoadLibraryW(fnamw);
 111         }
 112 #endif
 113
 114 /* Part of the hack in "win32_load" ... */
 115 #define DSO_MAX_TRANSLATED_SIZE 256
 116
 117 static int win32_load(DSO *dso);
 118 static int win32_unload(DSO *dso);
 119 static void *win32_bind_var(DSO *dso, const char *symname);
 120 static DSO_FUNC_TYPE win32_bind_func(DSO *dso, const char *symname);
 121 #if 0
 122 static int win32_unbind_var(DSO *dso, char *symname, void *symptr);
 123 static int win32_unbind_func(DSO *dso, char *symname, DSO_FUNC_TYPE symptr);
 124 static int win32_init(DSO *dso);
 125 static int win32_finish(DSO *dso);
 126 static long win32_ctrl(DSO *dso, int cmd, long larg, void *parg);
 127 #endif
 128 static char *win32_name_converter(DSO *dso, const char *filename);
 129 static char *win32_merger(DSO *dso, const char *filespec1,
 130         const char *filespec2);
 131 static int win32_pathbyaddr(void *addr,char *path,int sz);
 132
 133 static const char *openssl_strnchr(const char *string, int c, size_t len);
 134
 135 static DSO_METHOD dso_meth_win32 = {
 136         "OpenSSL 'win32' shared library method",
 137         win32_load,
 138         win32_unload,
 139         win32_bind_var,
 140         win32_bind_func,
 141 /* For now, "unbind" doesn't exist */
 142 #if 0
 143         NULL, /* unbind_var */
 144         NULL, /* unbind_func */
 145 #endif
 146         NULL, /* ctrl */
 147         win32_name_converter,
 148         win32_merger,
 149         NULL, /* init */
 150         NULL, /* finish */
 151         win32_pathbyaddr
 152         };
 153
 154 DSO_METHOD *DSO_METHOD_win32(void)
 155         {
 156         return(&dso_meth_win32);
 157         }
 158
 159 /* For this DSO_METHOD, our meth_data STACK will contain;
 160  * (i) a pointer to the handle (HINSTANCE) returned from
 161  *     LoadLibrary(), and copied.
 162  */
 163
 164 static int win32_load(DSO *dso)
 165         {
 166         HINSTANCE h = NULL, *p = NULL;
 167         /* See applicable comments from dso_dl.c */
 168         char *filename = DSO_convert_filename(dso, NULL);
 169
 170         if(filename == NULL)
 171                 {
 172                 DSOerr(DSO_F_WIN32_LOAD,DSO_R_NO_FILENAME);
 173                 goto err;
 174                 }
 175         h = LoadLibraryA(filename);
 176         if(h == NULL)
 177                 {
 178                 DSOerr(DSO_F_WIN32_LOAD,DSO_R_LOAD_FAILED);
 179                 ERR_add_error_data(3, "filename(", filename, ")");
 180                 goto err;
 181                 }
 182         p = (HINSTANCE *)OPENSSL_malloc(sizeof(HINSTANCE));
 183         if(p == NULL)
 184                 {
 185                 DSOerr(DSO_F_WIN32_LOAD,ERR_R_MALLOC_FAILURE);
 186                 goto err;
 187                 }
 188         *p = h;
 189         if(!sk_push(dso->meth_data, (char *)p))
 190                 {
 191                 DSOerr(DSO_F_WIN32_LOAD,DSO_R_STACK_ERROR);
 192                 goto err;
 193                 }
 194         /* Success */
 195         dso->loaded_filename = filename;
 196         return(1);
 197 err:
 198         /* Cleanup !*/
 199         if(filename != NULL)
 200                 OPENSSL_free(filename);
 201         if(p != NULL)
 202                 OPENSSL_free(p);
 203         if(h != NULL)
 204                 FreeLibrary(h);
 205         return(0);
 206         }
 207
 208 static int win32_unload(DSO *dso)
 209         {
 210         HINSTANCE *p;
 211         if(dso == NULL)
 212                 {
 213                 DSOerr(DSO_F_WIN32_UNLOAD,ERR_R_PASSED_NULL_PARAMETER);
 214                 return(0);
 215                 }
 216         if(sk_num(dso->meth_data) < 1)
 217                 return(1);
 218         p = (HINSTANCE *)sk_pop(dso->meth_data);
 219         if(p == NULL)
 220                 {
 221                 DSOerr(DSO_F_WIN32_UNLOAD,DSO_R_NULL_HANDLE);
 222                 return(0);
 223                 }
 224         if(!FreeLibrary(*p))
 225                 {
 226                 DSOerr(DSO_F_WIN32_UNLOAD,DSO_R_UNLOAD_FAILED);
 227                 /* We should push the value back onto the stack in
 228                  * case of a retry. */
 229                 sk_push(dso->meth_data, (char *)p);
 230                 return(0);
 231                 }
 232         /* Cleanup */
 233         OPENSSL_free(p);
 234         return(1);
 235         }
 236
 237 /* Using GetProcAddress for variables? TODO: Check this out in
 238  * the Win32 API docs, there's probably a variant for variables. */
 239 static void *win32_bind_var(DSO *dso, const char *symname)
 240         {
 241         HINSTANCE *ptr;
 242         void *sym;
 243
 244         if((dso == NULL) || (symname == NULL))
 245                 {
 246                 DSOerr(DSO_F_WIN32_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER);
 247                 return(NULL);
 248                 }
 249         if(sk_num(dso->meth_data) < 1)
 250                 {
 251                 DSOerr(DSO_F_WIN32_BIND_VAR,DSO_R_STACK_ERROR);
 252                 return(NULL);
 253                 }
 254         ptr = (HINSTANCE *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
 255         if(ptr == NULL)
 256                 {
 257                 DSOerr(DSO_F_WIN32_BIND_VAR,DSO_R_NULL_HANDLE);
 258                 return(NULL);
 259                 }
 260         sym = GetProcAddress(*ptr, symname);
 261         if(sym == NULL)
 262                 {
 263                 DSOerr(DSO_F_WIN32_BIND_VAR,DSO_R_SYM_FAILURE);
 264                 ERR_add_error_data(3, "symname(", symname, ")");
 265                 return(NULL);
 266                 }
 267         return(sym);
 268         }
 269
 270 static DSO_FUNC_TYPE win32_bind_func(DSO *dso, const char *symname)
 271         {
 272         HINSTANCE *ptr;
 273         void *sym;
 274
 275         if((dso == NULL) || (symname == NULL))
 276                 {
 277                 DSOerr(DSO_F_WIN32_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER);
 278                 return(NULL);
 279                 }
 280         if(sk_num(dso->meth_data) < 1)
 281                 {
 282                 DSOerr(DSO_F_WIN32_BIND_FUNC,DSO_R_STACK_ERROR);
 283                 return(NULL);
 284                 }
 285         ptr = (HINSTANCE *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
 286         if(ptr == NULL)
 287                 {
 288                 DSOerr(DSO_F_WIN32_BIND_FUNC,DSO_R_NULL_HANDLE);
 289                 return(NULL);
 290                 }
 291         sym = GetProcAddress(*ptr, symname);
 292         if(sym == NULL)
 293                 {
 294                 DSOerr(DSO_F_WIN32_BIND_FUNC,DSO_R_SYM_FAILURE);
 295                 ERR_add_error_data(3, "symname(", symname, ")");
 296                 return(NULL);
 297                 }
 298         return((DSO_FUNC_TYPE)sym);
 299         }
 300
 301 struct file_st
 302         {
 303         const char *node; int nodelen;
 304         const char *device; int devicelen;
 305         const char *predir; int predirlen;
 306         const char *dir; int dirlen;
 307         const char *file; int filelen;
 308         };
 309
 310 static struct file_st *win32_splitter(DSO *dso, const char *filename,
 311         int assume_last_is_dir)
 312         {
 313         struct file_st *result = NULL;
 314         enum { IN_NODE, IN_DEVICE, IN_FILE } position;
 315         const char *start = filename;
 316
 317         if (!filename)
 318                 {
 319                 DSOerr(DSO_F_WIN32_SPLITTER,DSO_R_NO_FILENAME);
 320                 /*goto err;*/
 321                 return(NULL);
 322                 }
 323
 324         result = OPENSSL_malloc(sizeof(struct file_st));
 325         if(result == NULL)
 326                 {
 327                 DSOerr(DSO_F_WIN32_SPLITTER,
 328                         ERR_R_MALLOC_FAILURE);
 329                 return(NULL);
 330                 }
 331
 332         memset(result, 0, sizeof(struct file_st));
 333         position = IN_DEVICE;
 334
 335         if((filename[0] == '\\' && filename[1] == '\\')
 336                 || (filename[0] == '/' && filename[1] == '/'))
 337                 {
 338                 position = IN_NODE;
 339                 filename += 2;
 340                 start = filename;
 341                 result->node = start;
 342                 }
 343
 344         do
 345                 {
 346                 switch(filename[0])
 347                         {
 348                 case ':':
 349                         if(position != IN_DEVICE)
 350                                 {
 351                                 DSOerr(DSO_F_WIN32_SPLITTER,
 352                                         DSO_R_INCORRECT_FILE_SYNTAX);
 353                                 /*goto err;*/
 354                                 return(NULL);
 355                                 }
 356                         result->device = start;
 357                         result->devicelen = filename - start;
 358                         position = IN_FILE;
 359                         start = ++filename;
 360                         result->dir = start;
 361                         break;
 362                 case '\\':
 363                 case '/':
 364                         if(position == IN_NODE)
 365                                 {
 366                                 result->nodelen = filename - start;
 367                                 position = IN_FILE;
 368                                 start = ++filename;
 369                                 result->dir = start;
 370                                 }
 371                         else
 372                                 {
 373                                 filename++;
 374                                 result->dirlen += filename - start;
 375                                 }
 376                         break;
 377                 case '\0':
 378                         if(position == IN_NODE)
 379                                 {
 380                                 result->nodelen = filename - start;
 381                                 }
 382                         else
 383                                 {
 384                                 if(filename - start > 0)
 385                                         {
 386                                         if (assume_last_is_dir)
 387                                                 {
 388                                                 result->devicelen += filename - start;
 389                                                 }
 390                                         else
 391                                                 {
 392                                                 result->file = start;
 393                                                 result->filelen = filename - start;
 394                                                 }
 395                                         }
 396                                 }
 397                         break;
 398                 default:
 399                         filename++;
 400                         break;
 401                         }
 402                 }
 403         while(*filename);
 404
 405         if(!result->nodelen) result->node = NULL;
 406         if(!result->devicelen) result->device = NULL;
 407         if(!result->dirlen) result->dir = NULL;
 408         if(!result->filelen) result->file = NULL;
 409
 410         return(result);
 411         }
 412
 413 static char *win32_joiner(DSO *dso, const struct file_st *file_split)
 414         {
 415         int len = 0, offset = 0;
 416         char *result = NULL;
 417         const char *start;
 418
 419         if(!file_split)
 420                 {
 421                 DSOerr(DSO_F_WIN32_JOINER,
 422                                 ERR_R_PASSED_NULL_PARAMETER);
 423                 return(NULL);
 424                 }
 425         if(file_split->node)
 426                 {
 427                 len += 2 + file_split->nodelen; /* 2 for starting \\ */
 428                 if(file_split->predir || file_split->dir || file_split->file)
 429                         len++;  /* 1 for ending \ */
 430                 }
 431         else if(file_split->device)
 432                 {
 433                 len += file_split->devicelen + 1; /* 1 for ending : */
 434                 }
 435         len += file_split->predirlen;
 436         if(file_split->predir && (file_split->dir || file_split->file))
 437                 {
 438                 len++;  /* 1 for ending \ */
 439                 }
 440         len += file_split->dirlen;
 441         if(file_split->dir && file_split->file)
 442                 {
 443                 len++;  /* 1 for ending \ */
 444                 }
 445         len += file_split->filelen;
 446
 447         if(!len)
 448                 {
 449                 DSOerr(DSO_F_WIN32_JOINER, DSO_R_EMPTY_FILE_STRUCTURE);
 450                 return(NULL);
 451                 }
 452
 453         result = OPENSSL_malloc(len + 1);
 454         if (!result)
 455                 {
 456                 DSOerr(DSO_F_WIN32_JOINER,
 457                         ERR_R_MALLOC_FAILURE);
 458                 return(NULL);
 459                 }
 460
 461         if(file_split->node)
 462                 {
 463                 strcpy(&result[offset], "\\\\"); offset += 2;
 464                 strncpy(&result[offset], file_split->node,
 465                         file_split->nodelen); offset += file_split->nodelen;
 466                 if(file_split->predir || file_split->dir || file_split->file)
 467                         {
 468                         result[offset] = '\\'; offset++;
 469                         }
 470                 }
 471         else if(file_split->device)
 472                 {
 473                 strncpy(&result[offset], file_split->device,
 474                         file_split->devicelen); offset += file_split->devicelen;
 475                 result[offset] = ':'; offset++;
 476                 }
 477         start = file_split->predir;
 478         while(file_split->predirlen > (start - file_split->predir))
 479                 {
 480                 const char *end = openssl_strnchr(start, '/',
 481                         file_split->predirlen - (start - file_split->predir));
 482                 if(!end)
 483                         end = start
 484                                 + file_split->predirlen
 485                                 - (start - file_split->predir);
 486                 strncpy(&result[offset], start,
 487                         end - start); offset += end - start;
 488                 result[offset] = '\\'; offset++;
 489                 start = end + 1;
 490                 }
 491         if(file_split->predir && (file_split->dir || file_split->file))
 492                 {
 493                 result[offset] = '\\'; offset++;
 494                 }
 495         start = file_split->dir;
 496         while(file_split->dirlen > (start - file_split->dir))
 497                 {
 498                 const char *end = openssl_strnchr(start, '/',
 499                         file_split->dirlen - (start - file_split->dir));
 500                 if(!end)
 501                         end = start
 502                                 + file_split->dirlen
 503                                 - (start - file_split->dir);
 504                 strncpy(&result[offset], start,
 505                         end - start); offset += end - start;
 506                 result[offset] = '\\'; offset++;
 507                 start = end + 1;
 508                 }
 509         if(file_split->dir && file_split->file)
 510                 {
 511                 result[offset] = '\\'; offset++;
 512                 }
 513         strncpy(&result[offset], file_split->file,
 514                 file_split->filelen); offset += file_split->filelen;
 515         result[offset] = '\0';
 516         return(result);
 517         }
 518
 519 static char *win32_merger(DSO *dso, const char *filespec1, const char *filespec2)
 520         {
 521         char *merged = NULL;
 522         struct file_st *filespec1_split = NULL;
 523         struct file_st *filespec2_split = NULL;
 524
 525         if(!filespec1 && !filespec2)
 526                 {
 527                 DSOerr(DSO_F_WIN32_MERGER,
 528                                 ERR_R_PASSED_NULL_PARAMETER);
 529                 return(NULL);
 530                 }
 531         if (!filespec2)
 532                 {
 533                 merged = OPENSSL_malloc(strlen(filespec1) + 1);
 534                 if(!merged)
 535                         {
 536                         DSOerr(DSO_F_WIN32_MERGER,
 537                                 ERR_R_MALLOC_FAILURE);
 538                         return(NULL);
 539                         }
 540                 strcpy(merged, filespec1);
 541                 }
 542         else if (!filespec1)
 543                 {
 544                 merged = OPENSSL_malloc(strlen(filespec2) + 1);
 545                 if(!merged)
 546                         {
 547                         DSOerr(DSO_F_WIN32_MERGER,
 548                                 ERR_R_MALLOC_FAILURE);
 549                         return(NULL);
 550                         }
 551                 strcpy(merged, filespec2);
 552                 }
 553         else
 554                 {
 555                 filespec1_split = win32_splitter(dso, filespec1, 1);
 556                 if (!filespec1_split)
 557                         {
 558                         DSOerr(DSO_F_WIN32_MERGER,
 559                                 ERR_R_MALLOC_FAILURE);
 560                         return(NULL);
 561                         }
 562                 filespec2_split = win32_splitter(dso, filespec2, 0);
 563                 if (!filespec1_split)
 564                         {
 565                         DSOerr(DSO_F_WIN32_MERGER,
 566                                 ERR_R_MALLOC_FAILURE);
 567                         OPENSSL_free(filespec1_split);
 568                         return(NULL);
 569                         }
 570
 571                 /* Fill in into filespec1_split */
 572                 if (!filespec1_split->node && !filespec1_split->device)
 573                         {
 574                         filespec1_split->node = filespec2_split->node;
 575                         filespec1_split->nodelen = filespec2_split->nodelen;
 576                         filespec1_split->device = filespec2_split->device;
 577                         filespec1_split->devicelen = filespec2_split->devicelen;
 578                         }
 579                 if (!filespec1_split->dir)
 580                         {
 581                         filespec1_split->dir = filespec2_split->dir;
 582                         filespec1_split->dirlen = filespec2_split->dirlen;
 583                         }
 584                 else if (filespec1_split->dir[0] != '\\'
 585                         && filespec1_split->dir[0] != '/')
 586                         {
 587                         filespec1_split->predir = filespec2_split->dir;
 588                         filespec1_split->predirlen = filespec2_split->dirlen;
 589                         }
 590                 if (!filespec1_split->file)
 591                         {
 592                         filespec1_split->file = filespec2_split->file;
 593                         filespec1_split->filelen = filespec2_split->filelen;
 594                         }
 595
 596                 merged = win32_joiner(dso, filespec1_split);
 597                 }
 598         return(merged);
 599         }
 600
 601 static char *win32_name_converter(DSO *dso, const char *filename)
 602         {
 603         char *translated;
 604         int len, transform;
 605
 606         len = strlen(filename);
 607         transform = ((strstr(filename, "/") == NULL) &&
 608                         (strstr(filename, "\\") == NULL) &&
 609                         (strstr(filename, ":") == NULL));
 610         if(transform)
 611                 /* We will convert this to "%s.dll" */
 612                 translated = OPENSSL_malloc(len + 5);
 613         else
 614                 /* We will simply duplicate filename */
 615                 translated = OPENSSL_malloc(len + 1);
 616         if(translated == NULL)
 617                 {
 618                 DSOerr(DSO_F_WIN32_NAME_CONVERTER,
 619                                 DSO_R_NAME_TRANSLATION_FAILED);
 620                 return(NULL);
 621                 }
 622         if(transform)
 623                 sprintf(translated, "%s.dll", filename);
 624         else
 625                 sprintf(translated, "%s", filename);
 626         return(translated);
 627         }
 628
 629 static const char *openssl_strnchr(const char *string, int c, size_t len)
 630         {
 631         size_t i;
 632         const char *p;
 633         for (i = 0, p = string; i < len && *p; i++, p++)
 634                 {
 635                 if (*p == c)
 636                         return p;
 637                 }
 638         return NULL;
 639         }
 640
 641 #include <tlhelp32.h>
 642 #ifdef _WIN32_WCE
 643 # define DLLNAME "TOOLHELP.DLL"
 644 #else
 645 # ifdef MODULEENTRY32
 646 # undef MODULEENTRY32   /* unmask the ASCII version! */
 647 # endif
 648 # define DLLNAME "KERNEL32.DLL"
 649 #endif
 650
 651 typedef HANDLE (WINAPI *CREATETOOLHELP32SNAPSHOT)(DWORD, DWORD);
 652 typedef BOOL (WINAPI *CLOSETOOLHELP32SNAPSHOT)(HANDLE);
 653 typedef BOOL (WINAPI *MODULE32)(HANDLE, MODULEENTRY32 *);
 654
 655 static int win32_pathbyaddr(void *addr,char *path,int sz)
 656         {
 657         HMODULE dll;
 658         HANDLE hModuleSnap = INVALID_HANDLE_VALUE;
 659         MODULEENTRY32 me32;
 660         CREATETOOLHELP32SNAPSHOT create_snap;
 661         CLOSETOOLHELP32SNAPSHOT  close_snap;
 662         MODULE32 module_first, module_next;
 663         int len;
 664
 665         if (addr == NULL)
 666                 {
 667                 union   { int(*f)(void*,char*,int); void *p; } t =
 668                         { win32_pathbyaddr };
 669                 addr = t.p;
 670                 }
 671
 672         dll = LoadLibrary(TEXT(DLLNAME));
 673         if (dll == NULL)
 674                 {
 675                 DSOerr(DSO_F_PATHBYADDR,DSO_R_UNSUPPORTED);
 676                 return -1;
 677                 }
 678
 679         create_snap = (CREATETOOLHELP32SNAPSHOT)
 680                 GetProcAddress(dll,"CreateToolhelp32Snapshot");
 681         if (create_snap == NULL)
 682                 {
 683                 DSOerr(DSO_F_PATHBYADDR,DSO_R_UNSUPPORTED);
 684                 return -1;
 685                 }
 686         /* We take the rest for granted... */
 687 #ifdef _WIN32_WCE
 688         close_snap = (CLOSETOOLHELP32SNAPSHOT)
 689                 GetProcAddress(dll,"CloseToolhelp32Snapshot");
 690 #else
 691         close_snap = (CLOSETOOLHELP32SNAPSHOT)CloseHandle;
 692 #endif
 693         module_first = (MODULE32)GetProcAddress(dll,"Module32First");
 694         module_next  = (MODULE32)GetProcAddress(dll,"Module32Next");
 695
 696         hModuleSnap = (*create_snap)(TH32CS_SNAPMODULE,0);
 697         if( hModuleSnap == INVALID_HANDLE_VALUE )
 698                 {
 699                 FreeLibrary(dll);
 700                 DSOerr(DSO_F_PATHBYADDR,DSO_R_UNSUPPORTED);
 701                 return -1;
 702                 }
 703
 704         me32.dwSize = sizeof(me32);
 705
 706         if(!(*module_first)(hModuleSnap,&me32))
 707                 {
 708                 (*close_snap)(hModuleSnap);
 709                 FreeLibrary(dll);
 710                 DSOerr(DSO_F_PATHBYADDR,DSO_R_FAILURE);
 711                 return -1;
 712                 }
 713
 714         do      {
 715                 if ((BYTE *)addr >= me32.modBaseAddr &&
 716                     (BYTE *)addr <  me32.modBaseAddr+me32.modBaseSize)
 717                         {
 718                         (*close_snap)(hModuleSnap);
 719                         FreeLibrary(dll);
 720 #ifdef _WIN32_WCE
 721 # if _WIN32_WCE >= 101
 722                         return WideCharToMultiByte(CP_ACP,0,me32.szExePath,-1,
 723                                                         path,sz,NULL,NULL);
 724 # else
 725                         len = (int)wcslen(me32.szExePath);
 726                         if (sz <= 0) return len+1;
 727                         if (len >= sz) len=sz-1;
 728                         for(i=0;i<len;i++)
 729                                 path[i] = (char)me32.szExePath[i];
 730                         path[len++] = 0;
 731                         return len;
 732 # endif
 733 #else
 734                         len = (int)strlen(me32.szExePath);
 735                         if (sz <= 0) return len+1;
 736                         if (len >= sz) len=sz-1;
 737                         memcpy(path,me32.szExePath,len);
 738                         path[len++] = 0;
 739                         return len;
 740 #endif
 741                         }
 742                 } while((*module_next)(hModuleSnap, &me32));
 743
 744         (*close_snap)(hModuleSnap);
 745         FreeLibrary(dll);
 746         return 0;
 747         }
 748 #endif /* DSO_WIN32 */