crypto/dso/dso_win32.c

   1 /*
   2  * Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL project
   3  * 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 "internal/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)
  81         return NULL;
  82     lpProcNameW[i] = 0;
  83
  84     return GetProcAddressW(hModule, lpProcNameW);
  85 }
  86 #  endif
  87 #  undef GetProcAddress
  88 #  define GetProcAddress GetProcAddressA
  89
  90 static HINSTANCE LoadLibraryA(LPCSTR lpLibFileName)
  91 {
  92     WCHAR *fnamw;
  93     size_t len_0 = strlen(lpLibFileName) + 1, i;
  94
  95 #  ifdef _MSC_VER
  96     fnamw = (WCHAR *)_alloca(len_0 * sizeof(WCHAR));
  97 #  else
  98     fnamw = (WCHAR *)alloca(len_0 * sizeof(WCHAR));
  99 #  endif
 100     if (fnamw == NULL) {
 101         SetLastError(ERROR_NOT_ENOUGH_MEMORY);
 102         return NULL;
 103     }
 104 #  if defined(_WIN32_WCE) && _WIN32_WCE>=101
 105     if (!MultiByteToWideChar(CP_ACP, 0, lpLibFileName, len_0, fnamw, len_0))
 106 #  endif
 107         for (i = 0; i < len_0; i++)
 108             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 static char *win32_name_converter(DSO *dso, const char *filename);
 122 static char *win32_merger(DSO *dso, const char *filespec1,
 123                           const char *filespec2);
 124 static int win32_pathbyaddr(void *addr, char *path, int sz);
 125 static void *win32_globallookup(const char *name);
 126
 127 static const char *openssl_strnchr(const char *string, int c, size_t len);
 128
 129 static DSO_METHOD dso_meth_win32 = {
 130     "OpenSSL 'win32' shared library method",
 131     win32_load,
 132     win32_unload,
 133     win32_bind_var,
 134     win32_bind_func,
 135     NULL,                       /* ctrl */
 136     win32_name_converter,
 137     win32_merger,
 138     NULL,                       /* init */
 139     NULL,                       /* finish */
 140     win32_pathbyaddr,
 141     win32_globallookup
 142 };
 143
 144 DSO_METHOD *DSO_METHOD_win32(void)
 145 {
 146     return (&dso_meth_win32);
 147 }
 148
 149 /*
 150  * For this DSO_METHOD, our meth_data STACK will contain; (i) a pointer to
 151  * the handle (HINSTANCE) returned from LoadLibrary(), and copied.
 152  */
 153
 154 static int win32_load(DSO *dso)
 155 {
 156     HINSTANCE h = NULL, *p = NULL;
 157     /* See applicable comments from dso_dl.c */
 158     char *filename = DSO_convert_filename(dso, NULL);
 159
 160     if (filename == NULL) {
 161         DSOerr(DSO_F_WIN32_LOAD, DSO_R_NO_FILENAME);
 162         goto err;
 163     }
 164     h = LoadLibraryA(filename);
 165     if (h == NULL) {
 166         DSOerr(DSO_F_WIN32_LOAD, DSO_R_LOAD_FAILED);
 167         ERR_add_error_data(3, "filename(", filename, ")");
 168         goto err;
 169     }
 170     p = OPENSSL_malloc(sizeof(*p));
 171     if (p == NULL) {
 172         DSOerr(DSO_F_WIN32_LOAD, ERR_R_MALLOC_FAILURE);
 173         goto err;
 174     }
 175     *p = h;
 176     if (!sk_void_push(dso->meth_data, p)) {
 177         DSOerr(DSO_F_WIN32_LOAD, DSO_R_STACK_ERROR);
 178         goto err;
 179     }
 180     /* Success */
 181     dso->loaded_filename = filename;
 182     return (1);
 183  err:
 184     /* Cleanup ! */
 185     OPENSSL_free(filename);
 186     OPENSSL_free(p);
 187     if (h != NULL)
 188         FreeLibrary(h);
 189     return (0);
 190 }
 191
 192 static int win32_unload(DSO *dso)
 193 {
 194     HINSTANCE *p;
 195     if (dso == NULL) {
 196         DSOerr(DSO_F_WIN32_UNLOAD, ERR_R_PASSED_NULL_PARAMETER);
 197         return (0);
 198     }
 199     if (sk_void_num(dso->meth_data) < 1)
 200         return (1);
 201     p = sk_void_pop(dso->meth_data);
 202     if (p == NULL) {
 203         DSOerr(DSO_F_WIN32_UNLOAD, DSO_R_NULL_HANDLE);
 204         return (0);
 205     }
 206     if (!FreeLibrary(*p)) {
 207         DSOerr(DSO_F_WIN32_UNLOAD, DSO_R_UNLOAD_FAILED);
 208         /*
 209          * We should push the value back onto the stack in case of a retry.
 210          */
 211         sk_void_push(dso->meth_data, p);
 212         return (0);
 213     }
 214     /* Cleanup */
 215     OPENSSL_free(p);
 216     return (1);
 217 }
 218
 219 /*
 220  * Using GetProcAddress for variables? TODO: Check this out in the Win32 API
 221  * docs, there's probably a variant for variables.
 222  */
 223 static void *win32_bind_var(DSO *dso, const char *symname)
 224 {
 225     HINSTANCE *ptr;
 226     union {
 227         void *p;
 228         FARPROC f;
 229     } sym;
 230
 231     if ((dso == NULL) || (symname == NULL)) {
 232         DSOerr(DSO_F_WIN32_BIND_VAR, ERR_R_PASSED_NULL_PARAMETER);
 233         return (NULL);
 234     }
 235     if (sk_void_num(dso->meth_data) < 1) {
 236         DSOerr(DSO_F_WIN32_BIND_VAR, DSO_R_STACK_ERROR);
 237         return (NULL);
 238     }
 239     ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
 240     if (ptr == NULL) {
 241         DSOerr(DSO_F_WIN32_BIND_VAR, DSO_R_NULL_HANDLE);
 242         return (NULL);
 243     }
 244     sym.f = GetProcAddress(*ptr, symname);
 245     if (sym.p == NULL) {
 246         DSOerr(DSO_F_WIN32_BIND_VAR, DSO_R_SYM_FAILURE);
 247         ERR_add_error_data(3, "symname(", symname, ")");
 248         return (NULL);
 249     }
 250     return (sym.p);
 251 }
 252
 253 static DSO_FUNC_TYPE win32_bind_func(DSO *dso, const char *symname)
 254 {
 255     HINSTANCE *ptr;
 256     union {
 257         void *p;
 258         FARPROC f;
 259     } sym;
 260
 261     if ((dso == NULL) || (symname == NULL)) {
 262         DSOerr(DSO_F_WIN32_BIND_FUNC, ERR_R_PASSED_NULL_PARAMETER);
 263         return (NULL);
 264     }
 265     if (sk_void_num(dso->meth_data) < 1) {
 266         DSOerr(DSO_F_WIN32_BIND_FUNC, DSO_R_STACK_ERROR);
 267         return (NULL);
 268     }
 269     ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
 270     if (ptr == NULL) {
 271         DSOerr(DSO_F_WIN32_BIND_FUNC, DSO_R_NULL_HANDLE);
 272         return (NULL);
 273     }
 274     sym.f = GetProcAddress(*ptr, symname);
 275     if (sym.p == NULL) {
 276         DSOerr(DSO_F_WIN32_BIND_FUNC, DSO_R_SYM_FAILURE);
 277         ERR_add_error_data(3, "symname(", symname, ")");
 278         return (NULL);
 279     }
 280     return ((DSO_FUNC_TYPE)sym.f);
 281 }
 282
 283 struct file_st {
 284     const char *node;
 285     int nodelen;
 286     const char *device;
 287     int devicelen;
 288     const char *predir;
 289     int predirlen;
 290     const char *dir;
 291     int dirlen;
 292     const char *file;
 293     int filelen;
 294 };
 295
 296 static struct file_st *win32_splitter(DSO *dso, const char *filename,
 297                                       int assume_last_is_dir)
 298 {
 299     struct file_st *result = NULL;
 300     enum { IN_NODE, IN_DEVICE, IN_FILE } position;
 301     const char *start = filename;
 302     char last;
 303
 304     if (!filename) {
 305         DSOerr(DSO_F_WIN32_SPLITTER, DSO_R_NO_FILENAME);
 306         /*
 307          * goto err;
 308          */
 309         return (NULL);
 310     }
 311
 312     result = OPENSSL_zalloc(sizeof(*result));
 313     if (result == NULL) {
 314         DSOerr(DSO_F_WIN32_SPLITTER, ERR_R_MALLOC_FAILURE);
 315         return (NULL);
 316     }
 317
 318     position = IN_DEVICE;
 319
 320     if ((filename[0] == '\\' && filename[1] == '\\')
 321         || (filename[0] == '/' && filename[1] == '/')) {
 322         position = IN_NODE;
 323         filename += 2;
 324         start = filename;
 325         result->node = start;
 326     }
 327
 328     do {
 329         last = filename[0];
 330         switch (last) {
 331         case ':':
 332             if (position != IN_DEVICE) {
 333                 DSOerr(DSO_F_WIN32_SPLITTER, DSO_R_INCORRECT_FILE_SYNTAX);
 334                 /*
 335                  * goto err;
 336                  */
 337                 OPENSSL_free(result);
 338                 return (NULL);
 339             }
 340             result->device = start;
 341             result->devicelen = (int)(filename - start);
 342             position = IN_FILE;
 343             start = ++filename;
 344             result->dir = start;
 345             break;
 346         case '\\':
 347         case '/':
 348             if (position == IN_NODE) {
 349                 result->nodelen = (int)(filename - start);
 350                 position = IN_FILE;
 351                 start = ++filename;
 352                 result->dir = start;
 353             } else if (position == IN_DEVICE) {
 354                 position = IN_FILE;
 355                 filename++;
 356                 result->dir = start;
 357                 result->dirlen = (int)(filename - start);
 358                 start = filename;
 359             } else {
 360                 filename++;
 361                 result->dirlen += (int)(filename - start);
 362                 start = filename;
 363             }
 364             break;
 365         case '\0':
 366             if (position == IN_NODE) {
 367                 result->nodelen = (int)(filename - start);
 368             } else {
 369                 if (filename - start > 0) {
 370                     if (assume_last_is_dir) {
 371                         if (position == IN_DEVICE) {
 372                             result->dir = start;
 373                             result->dirlen = 0;
 374                         }
 375                         result->dirlen += (int)(filename - start);
 376                     } else {
 377                         result->file = start;
 378                         result->filelen = (int)(filename - start);
 379                     }
 380                 }
 381             }
 382             break;
 383         default:
 384             filename++;
 385             break;
 386         }
 387     }
 388     while (last);
 389
 390     if (!result->nodelen)
 391         result->node = NULL;
 392     if (!result->devicelen)
 393         result->device = NULL;
 394     if (!result->dirlen)
 395         result->dir = NULL;
 396     if (!result->filelen)
 397         result->file = NULL;
 398
 399     return (result);
 400 }
 401
 402 static char *win32_joiner(DSO *dso, const struct file_st *file_split)
 403 {
 404     int len = 0, offset = 0;
 405     char *result = NULL;
 406     const char *start;
 407
 408     if (!file_split) {
 409         DSOerr(DSO_F_WIN32_JOINER, ERR_R_PASSED_NULL_PARAMETER);
 410         return (NULL);
 411     }
 412     if (file_split->node) {
 413         len += 2 + file_split->nodelen; /* 2 for starting \\ */
 414         if (file_split->predir || file_split->dir || file_split->file)
 415             len++;              /* 1 for ending \ */
 416     } else if (file_split->device) {
 417         len += file_split->devicelen + 1; /* 1 for ending : */
 418     }
 419     len += file_split->predirlen;
 420     if (file_split->predir && (file_split->dir || file_split->file)) {
 421         len++;                  /* 1 for ending \ */
 422     }
 423     len += file_split->dirlen;
 424     if (file_split->dir && file_split->file) {
 425         len++;                  /* 1 for ending \ */
 426     }
 427     len += file_split->filelen;
 428
 429     if (!len) {
 430         DSOerr(DSO_F_WIN32_JOINER, DSO_R_EMPTY_FILE_STRUCTURE);
 431         return (NULL);
 432     }
 433
 434     result = OPENSSL_malloc(len + 1);
 435     if (result == NULL) {
 436         DSOerr(DSO_F_WIN32_JOINER, ERR_R_MALLOC_FAILURE);
 437         return (NULL);
 438     }
 439
 440     if (file_split->node) {
 441         strcpy(&result[offset], "\\\\");
 442         offset += 2;
 443         strncpy(&result[offset], file_split->node, file_split->nodelen);
 444         offset += file_split->nodelen;
 445         if (file_split->predir || file_split->dir || file_split->file) {
 446             result[offset] = '\\';
 447             offset++;
 448         }
 449     } else if (file_split->device) {
 450         strncpy(&result[offset], file_split->device, file_split->devicelen);
 451         offset += file_split->devicelen;
 452         result[offset] = ':';
 453         offset++;
 454     }
 455     start = file_split->predir;
 456     while (file_split->predirlen > (start - file_split->predir)) {
 457         const char *end = openssl_strnchr(start, '/',
 458                                           file_split->predirlen - (start -
 459                                                                    file_split->predir));
 460         if (!end)
 461             end = start
 462                 + file_split->predirlen - (start - file_split->predir);
 463         strncpy(&result[offset], start, end - start);
 464         offset += (int)(end - start);
 465         result[offset] = '\\';
 466         offset++;
 467         start = end + 1;
 468     }
 469     start = file_split->dir;
 470     while (file_split->dirlen > (start - file_split->dir)) {
 471         const char *end = openssl_strnchr(start, '/',
 472                                           file_split->dirlen - (start -
 473                                                                 file_split->dir));
 474         if (!end)
 475             end = start + file_split->dirlen - (start - file_split->dir);
 476         strncpy(&result[offset], start, end - start);
 477         offset += (int)(end - start);
 478         result[offset] = '\\';
 479         offset++;
 480         start = end + 1;
 481     }
 482     strncpy(&result[offset], file_split->file, file_split->filelen);
 483     offset += file_split->filelen;
 484     result[offset] = '\0';
 485     return (result);
 486 }
 487
 488 static char *win32_merger(DSO *dso, const char *filespec1,
 489                           const char *filespec2)
 490 {
 491     char *merged = NULL;
 492     struct file_st *filespec1_split = NULL;
 493     struct file_st *filespec2_split = NULL;
 494
 495     if (!filespec1 && !filespec2) {
 496         DSOerr(DSO_F_WIN32_MERGER, ERR_R_PASSED_NULL_PARAMETER);
 497         return (NULL);
 498     }
 499     if (!filespec2) {
 500         merged = OPENSSL_malloc(strlen(filespec1) + 1);
 501         if (merged == NULL) {
 502             DSOerr(DSO_F_WIN32_MERGER, ERR_R_MALLOC_FAILURE);
 503             return (NULL);
 504         }
 505         strcpy(merged, filespec1);
 506     } else if (!filespec1) {
 507         merged = OPENSSL_malloc(strlen(filespec2) + 1);
 508         if (merged == NULL) {
 509             DSOerr(DSO_F_WIN32_MERGER, ERR_R_MALLOC_FAILURE);
 510             return (NULL);
 511         }
 512         strcpy(merged, filespec2);
 513     } else {
 514         filespec1_split = win32_splitter(dso, filespec1, 0);
 515         if (!filespec1_split) {
 516             DSOerr(DSO_F_WIN32_MERGER, ERR_R_MALLOC_FAILURE);
 517             return (NULL);
 518         }
 519         filespec2_split = win32_splitter(dso, filespec2, 1);
 520         if (!filespec2_split) {
 521             DSOerr(DSO_F_WIN32_MERGER, ERR_R_MALLOC_FAILURE);
 522             OPENSSL_free(filespec1_split);
 523             return (NULL);
 524         }
 525
 526         /* Fill in into filespec1_split */
 527         if (!filespec1_split->node && !filespec1_split->device) {
 528             filespec1_split->node = filespec2_split->node;
 529             filespec1_split->nodelen = filespec2_split->nodelen;
 530             filespec1_split->device = filespec2_split->device;
 531             filespec1_split->devicelen = filespec2_split->devicelen;
 532         }
 533         if (!filespec1_split->dir) {
 534             filespec1_split->dir = filespec2_split->dir;
 535             filespec1_split->dirlen = filespec2_split->dirlen;
 536         } else if (filespec1_split->dir[0] != '\\'
 537                    && filespec1_split->dir[0] != '/') {
 538             filespec1_split->predir = filespec2_split->dir;
 539             filespec1_split->predirlen = filespec2_split->dirlen;
 540         }
 541         if (!filespec1_split->file) {
 542             filespec1_split->file = filespec2_split->file;
 543             filespec1_split->filelen = filespec2_split->filelen;
 544         }
 545
 546         merged = win32_joiner(dso, filespec1_split);
 547     }
 548     OPENSSL_free(filespec1_split);
 549     OPENSSL_free(filespec2_split);
 550     return (merged);
 551 }
 552
 553 static char *win32_name_converter(DSO *dso, const char *filename)
 554 {
 555     char *translated;
 556     int len, transform;
 557
 558     len = strlen(filename);
 559     transform = ((strstr(filename, "/") == NULL) &&
 560                  (strstr(filename, "\\") == NULL) &&
 561                  (strstr(filename, ":") == NULL));
 562     if (transform)
 563         /* We will convert this to "%s.dll" */
 564         translated = OPENSSL_malloc(len + 5);
 565     else
 566         /* We will simply duplicate filename */
 567         translated = OPENSSL_malloc(len + 1);
 568     if (translated == NULL) {
 569         DSOerr(DSO_F_WIN32_NAME_CONVERTER, DSO_R_NAME_TRANSLATION_FAILED);
 570         return (NULL);
 571     }
 572     if (transform)
 573         sprintf(translated, "%s.dll", filename);
 574     else
 575         sprintf(translated, "%s", filename);
 576     return (translated);
 577 }
 578
 579 static const char *openssl_strnchr(const char *string, int c, size_t len)
 580 {
 581     size_t i;
 582     const char *p;
 583     for (i = 0, p = string; i < len && *p; i++, p++) {
 584         if (*p == c)
 585             return p;
 586     }
 587     return NULL;
 588 }
 589
 590 # include <tlhelp32.h>
 591 # ifdef _WIN32_WCE
 592 #  define DLLNAME "TOOLHELP.DLL"
 593 # else
 594 #  ifdef MODULEENTRY32
 595 #   undef MODULEENTRY32         /* unmask the ASCII version! */
 596 #  endif
 597 #  define DLLNAME "KERNEL32.DLL"
 598 # endif
 599
 600 typedef HANDLE(WINAPI *CREATETOOLHELP32SNAPSHOT) (DWORD, DWORD);
 601 typedef BOOL(WINAPI *CLOSETOOLHELP32SNAPSHOT) (HANDLE);
 602 typedef BOOL(WINAPI *MODULE32) (HANDLE, MODULEENTRY32 *);
 603
 604 static int win32_pathbyaddr(void *addr, char *path, int sz)
 605 {
 606     HMODULE dll;
 607     HANDLE hModuleSnap = INVALID_HANDLE_VALUE;
 608     MODULEENTRY32 me32;
 609     CREATETOOLHELP32SNAPSHOT create_snap;
 610     CLOSETOOLHELP32SNAPSHOT close_snap;
 611     MODULE32 module_first, module_next;
 612
 613     if (addr == NULL) {
 614         union {
 615             int (*f) (void *, char *, int);
 616             void *p;
 617         } t = {
 618             win32_pathbyaddr
 619         };
 620         addr = t.p;
 621     }
 622
 623     dll = LoadLibrary(TEXT(DLLNAME));
 624     if (dll == NULL) {
 625         DSOerr(DSO_F_WIN32_PATHBYADDR, DSO_R_UNSUPPORTED);
 626         return -1;
 627     }
 628
 629     create_snap = (CREATETOOLHELP32SNAPSHOT)
 630         GetProcAddress(dll, "CreateToolhelp32Snapshot");
 631     if (create_snap == NULL) {
 632         FreeLibrary(dll);
 633         DSOerr(DSO_F_WIN32_PATHBYADDR, DSO_R_UNSUPPORTED);
 634         return -1;
 635     }
 636     /* We take the rest for granted... */
 637 # ifdef _WIN32_WCE
 638     close_snap = (CLOSETOOLHELP32SNAPSHOT)
 639         GetProcAddress(dll, "CloseToolhelp32Snapshot");
 640 # else
 641     close_snap = (CLOSETOOLHELP32SNAPSHOT) CloseHandle;
 642 # endif
 643     module_first = (MODULE32) GetProcAddress(dll, "Module32First");
 644     module_next = (MODULE32) GetProcAddress(dll, "Module32Next");
 645
 646     hModuleSnap = (*create_snap) (TH32CS_SNAPMODULE, 0);
 647     if (hModuleSnap == INVALID_HANDLE_VALUE) {
 648         FreeLibrary(dll);
 649         DSOerr(DSO_F_WIN32_PATHBYADDR, DSO_R_UNSUPPORTED);
 650         return -1;
 651     }
 652
 653     me32.dwSize = sizeof(me32);
 654
 655     if (!(*module_first) (hModuleSnap, &me32)) {
 656         (*close_snap) (hModuleSnap);
 657         FreeLibrary(dll);
 658         DSOerr(DSO_F_WIN32_PATHBYADDR, DSO_R_FAILURE);
 659         return -1;
 660     }
 661
 662     do {
 663         if ((BYTE *) addr >= me32.modBaseAddr &&
 664             (BYTE *) addr < me32.modBaseAddr + me32.modBaseSize) {
 665             (*close_snap) (hModuleSnap);
 666             FreeLibrary(dll);
 667 # ifdef _WIN32_WCE
 668 #  if _WIN32_WCE >= 101
 669             return WideCharToMultiByte(CP_ACP, 0, me32.szExePath, -1,
 670                                        path, sz, NULL, NULL);
 671 #  else
 672             {
 673                 int i, len = (int)wcslen(me32.szExePath);
 674                 if (sz <= 0)
 675                     return len + 1;
 676                 if (len >= sz)
 677                     len = sz - 1;
 678                 for (i = 0; i < len; i++)
 679                     path[i] = (char)me32.szExePath[i];
 680                 path[len++] = 0;
 681                 return len;
 682             }
 683 #  endif
 684 # else
 685             {
 686                 int len = (int)strlen(me32.szExePath);
 687                 if (sz <= 0)
 688                     return len + 1;
 689                 if (len >= sz)
 690                     len = sz - 1;
 691                 memcpy(path, me32.szExePath, len);
 692                 path[len++] = 0;
 693                 return len;
 694             }
 695 # endif
 696         }
 697     } while ((*module_next) (hModuleSnap, &me32));
 698
 699     (*close_snap) (hModuleSnap);
 700     FreeLibrary(dll);
 701     return 0;
 702 }
 703
 704 static void *win32_globallookup(const char *name)
 705 {
 706     HMODULE dll;
 707     HANDLE hModuleSnap = INVALID_HANDLE_VALUE;
 708     MODULEENTRY32 me32;
 709     CREATETOOLHELP32SNAPSHOT create_snap;
 710     CLOSETOOLHELP32SNAPSHOT close_snap;
 711     MODULE32 module_first, module_next;
 712     union {
 713         void *p;
 714         FARPROC f;
 715     } ret = { NULL };
 716
 717     dll = LoadLibrary(TEXT(DLLNAME));
 718     if (dll == NULL) {
 719         DSOerr(DSO_F_WIN32_GLOBALLOOKUP, DSO_R_UNSUPPORTED);
 720         return NULL;
 721     }
 722
 723     create_snap = (CREATETOOLHELP32SNAPSHOT)
 724         GetProcAddress(dll, "CreateToolhelp32Snapshot");
 725     if (create_snap == NULL) {
 726         FreeLibrary(dll);
 727         DSOerr(DSO_F_WIN32_GLOBALLOOKUP, DSO_R_UNSUPPORTED);
 728         return NULL;
 729     }
 730     /* We take the rest for granted... */
 731 # ifdef _WIN32_WCE
 732     close_snap = (CLOSETOOLHELP32SNAPSHOT)
 733         GetProcAddress(dll, "CloseToolhelp32Snapshot");
 734 # else
 735     close_snap = (CLOSETOOLHELP32SNAPSHOT) CloseHandle;
 736 # endif
 737     module_first = (MODULE32) GetProcAddress(dll, "Module32First");
 738     module_next = (MODULE32) GetProcAddress(dll, "Module32Next");
 739
 740     hModuleSnap = (*create_snap) (TH32CS_SNAPMODULE, 0);
 741     if (hModuleSnap == INVALID_HANDLE_VALUE) {
 742         FreeLibrary(dll);
 743         DSOerr(DSO_F_WIN32_GLOBALLOOKUP, DSO_R_UNSUPPORTED);
 744         return NULL;
 745     }
 746
 747     me32.dwSize = sizeof(me32);
 748
 749     if (!(*module_first) (hModuleSnap, &me32)) {
 750         (*close_snap) (hModuleSnap);
 751         FreeLibrary(dll);
 752         return NULL;
 753     }
 754
 755     do {
 756         if ((ret.f = GetProcAddress(me32.hModule, name))) {
 757             (*close_snap) (hModuleSnap);
 758             FreeLibrary(dll);
 759             return ret.p;
 760         }
 761     } while ((*module_next) (hModuleSnap, &me32));
 762
 763     (*close_snap) (hModuleSnap);
 764     FreeLibrary(dll);
 765     return NULL;
 766 }
 767 #endif                          /* DSO_WIN32 */