crypto/dso/dso_win32.c

   1 /* dso_win32.c -*- mode:C; c-file-style: "eay" -*- */
   2 /*
   3  * Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL project
   4  * 2000.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 2000 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    licensing@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59
  60 #include <stdio.h>
  61 #include <string.h>
  62 #include "internal/cryptlib.h"
  63 #include <openssl/dso.h>
  64
  65 #if !defined(DSO_WIN32)
  66 DSO_METHOD *DSO_METHOD_win32(void)
  67 {
  68     return NULL;
  69 }
  70 #else
  71
  72 # ifdef _WIN32_WCE
  73 #  if _WIN32_WCE < 300
  74 static FARPROC GetProcAddressA(HMODULE hModule, LPCSTR lpProcName)
  75 {
  76     WCHAR lpProcNameW[64];
  77     int i;
  78
  79     for (i = 0; lpProcName[i] && i < 64; i++)
  80         lpProcNameW[i] = (WCHAR)lpProcName[i];
  81     if (i == 64)
  82         return NULL;
  83     lpProcNameW[i] = 0;
  84
  85     return GetProcAddressW(hModule, lpProcNameW);
  86 }
  87 #  endif
  88 #  undef GetProcAddress
  89 #  define GetProcAddress GetProcAddressA
  90
  91 static HINSTANCE LoadLibraryA(LPCSTR lpLibFileName)
  92 {
  93     WCHAR *fnamw;
  94     size_t len_0 = strlen(lpLibFileName) + 1, i;
  95
  96 #  ifdef _MSC_VER
  97     fnamw = (WCHAR *)_alloca(len_0 * sizeof(WCHAR));
  98 #  else
  99     fnamw = (WCHAR *)alloca(len_0 * sizeof(WCHAR));
 100 #  endif
 101     if (fnamw == NULL) {
 102         SetLastError(ERROR_NOT_ENOUGH_MEMORY);
 103         return NULL;
 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++)
 109             fnamw[i] = (WCHAR)lpLibFileName[i];
 110
 111     return LoadLibraryW(fnamw);
 112 }
 113 # endif
 114
 115 /* Part of the hack in "win32_load" ... */
 116 # define DSO_MAX_TRANSLATED_SIZE 256
 117
 118 static int win32_load(DSO *dso);
 119 static int win32_unload(DSO *dso);
 120 static void *win32_bind_var(DSO *dso, const char *symname);
 121 static DSO_FUNC_TYPE win32_bind_func(DSO *dso, const char *symname);
 122 static char *win32_name_converter(DSO *dso, const char *filename);
 123 static char *win32_merger(DSO *dso, const char *filespec1,
 124                           const char *filespec2);
 125 static int win32_pathbyaddr(void *addr, char *path, int sz);
 126 static void *win32_globallookup(const char *name);
 127
 128 static const char *openssl_strnchr(const char *string, int c, size_t len);
 129
 130 static DSO_METHOD dso_meth_win32 = {
 131     "OpenSSL 'win32' shared library method",
 132     win32_load,
 133     win32_unload,
 134     win32_bind_var,
 135     win32_bind_func,
 136     NULL,                       /* ctrl */
 137     win32_name_converter,
 138     win32_merger,
 139     NULL,                       /* init */
 140     NULL,                       /* finish */
 141     win32_pathbyaddr,
 142     win32_globallookup
 143 };
 144
 145 DSO_METHOD *DSO_METHOD_win32(void)
 146 {
 147     return (&dso_meth_win32);
 148 }
 149
 150 /*
 151  * For this DSO_METHOD, our meth_data STACK will contain; (i) a pointer to
 152  * the handle (HINSTANCE) returned from LoadLibrary(), and copied.
 153  */
 154
 155 static int win32_load(DSO *dso)
 156 {
 157     HINSTANCE h = NULL, *p = NULL;
 158     /* See applicable comments from dso_dl.c */
 159     char *filename = DSO_convert_filename(dso, NULL);
 160
 161     if (filename == NULL) {
 162         DSOerr(DSO_F_WIN32_LOAD, DSO_R_NO_FILENAME);
 163         goto err;
 164     }
 165     h = LoadLibraryA(filename);
 166     if (h == NULL) {
 167         DSOerr(DSO_F_WIN32_LOAD, DSO_R_LOAD_FAILED);
 168         ERR_add_error_data(3, "filename(", filename, ")");
 169         goto err;
 170     }
 171     p = OPENSSL_malloc(sizeof(*p));
 172     if (p == NULL) {
 173         DSOerr(DSO_F_WIN32_LOAD, ERR_R_MALLOC_FAILURE);
 174         goto err;
 175     }
 176     *p = h;
 177     if (!sk_void_push(dso->meth_data, p)) {
 178         DSOerr(DSO_F_WIN32_LOAD, DSO_R_STACK_ERROR);
 179         goto err;
 180     }
 181     /* Success */
 182     dso->loaded_filename = filename;
 183     return (1);
 184  err:
 185     /* Cleanup ! */
 186     OPENSSL_free(filename);
 187     OPENSSL_free(p);
 188     if (h != NULL)
 189         FreeLibrary(h);
 190     return (0);
 191 }
 192
 193 static int win32_unload(DSO *dso)
 194 {
 195     HINSTANCE *p;
 196     if (dso == NULL) {
 197         DSOerr(DSO_F_WIN32_UNLOAD, ERR_R_PASSED_NULL_PARAMETER);
 198         return (0);
 199     }
 200     if (sk_void_num(dso->meth_data) < 1)
 201         return (1);
 202     p = sk_void_pop(dso->meth_data);
 203     if (p == NULL) {
 204         DSOerr(DSO_F_WIN32_UNLOAD, DSO_R_NULL_HANDLE);
 205         return (0);
 206     }
 207     if (!FreeLibrary(*p)) {
 208         DSOerr(DSO_F_WIN32_UNLOAD, DSO_R_UNLOAD_FAILED);
 209         /*
 210          * We should push the value back onto the stack in case of a retry.
 211          */
 212         sk_void_push(dso->meth_data, p);
 213         return (0);
 214     }
 215     /* Cleanup */
 216     OPENSSL_free(p);
 217     return (1);
 218 }
 219
 220 /*
 221  * Using GetProcAddress for variables? TODO: Check this out in the Win32 API
 222  * docs, there's probably a variant for variables.
 223  */
 224 static void *win32_bind_var(DSO *dso, const char *symname)
 225 {
 226     HINSTANCE *ptr;
 227     void *sym;
 228
 229     if ((dso == NULL) || (symname == NULL)) {
 230         DSOerr(DSO_F_WIN32_BIND_VAR, ERR_R_PASSED_NULL_PARAMETER);
 231         return (NULL);
 232     }
 233     if (sk_void_num(dso->meth_data) < 1) {
 234         DSOerr(DSO_F_WIN32_BIND_VAR, DSO_R_STACK_ERROR);
 235         return (NULL);
 236     }
 237     ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
 238     if (ptr == NULL) {
 239         DSOerr(DSO_F_WIN32_BIND_VAR, DSO_R_NULL_HANDLE);
 240         return (NULL);
 241     }
 242     sym = GetProcAddress(*ptr, symname);
 243     if (sym == NULL) {
 244         DSOerr(DSO_F_WIN32_BIND_VAR, DSO_R_SYM_FAILURE);
 245         ERR_add_error_data(3, "symname(", symname, ")");
 246         return (NULL);
 247     }
 248     return (sym);
 249 }
 250
 251 static DSO_FUNC_TYPE win32_bind_func(DSO *dso, const char *symname)
 252 {
 253     HINSTANCE *ptr;
 254     void *sym;
 255
 256     if ((dso == NULL) || (symname == NULL)) {
 257         DSOerr(DSO_F_WIN32_BIND_FUNC, ERR_R_PASSED_NULL_PARAMETER);
 258         return (NULL);
 259     }
 260     if (sk_void_num(dso->meth_data) < 1) {
 261         DSOerr(DSO_F_WIN32_BIND_FUNC, DSO_R_STACK_ERROR);
 262         return (NULL);
 263     }
 264     ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
 265     if (ptr == NULL) {
 266         DSOerr(DSO_F_WIN32_BIND_FUNC, DSO_R_NULL_HANDLE);
 267         return (NULL);
 268     }
 269     sym = GetProcAddress(*ptr, symname);
 270     if (sym == NULL) {
 271         DSOerr(DSO_F_WIN32_BIND_FUNC, DSO_R_SYM_FAILURE);
 272         ERR_add_error_data(3, "symname(", symname, ")");
 273         return (NULL);
 274     }
 275     return ((DSO_FUNC_TYPE)sym);
 276 }
 277
 278 struct file_st {
 279     const char *node;
 280     int nodelen;
 281     const char *device;
 282     int devicelen;
 283     const char *predir;
 284     int predirlen;
 285     const char *dir;
 286     int dirlen;
 287     const char *file;
 288     int filelen;
 289 };
 290
 291 static struct file_st *win32_splitter(DSO *dso, const char *filename,
 292                                       int assume_last_is_dir)
 293 {
 294     struct file_st *result = NULL;
 295     enum { IN_NODE, IN_DEVICE, IN_FILE } position;
 296     const char *start = filename;
 297     char last;
 298
 299     if (!filename) {
 300         DSOerr(DSO_F_WIN32_SPLITTER, DSO_R_NO_FILENAME);
 301         /*
 302          * goto err;
 303          */
 304         return (NULL);
 305     }
 306
 307     result = OPENSSL_zalloc(sizeof(*result));
 308     if (result == NULL) {
 309         DSOerr(DSO_F_WIN32_SPLITTER, ERR_R_MALLOC_FAILURE);
 310         return (NULL);
 311     }
 312
 313     position = IN_DEVICE;
 314
 315     if ((filename[0] == '\\' && filename[1] == '\\')
 316         || (filename[0] == '/' && filename[1] == '/')) {
 317         position = IN_NODE;
 318         filename += 2;
 319         start = filename;
 320         result->node = start;
 321     }
 322
 323     do {
 324         last = filename[0];
 325         switch (last) {
 326         case ':':
 327             if (position != IN_DEVICE) {
 328                 DSOerr(DSO_F_WIN32_SPLITTER, DSO_R_INCORRECT_FILE_SYNTAX);
 329                 /*
 330                  * goto err;
 331                  */
 332                 OPENSSL_free(result);
 333                 return (NULL);
 334             }
 335             result->device = start;
 336             result->devicelen = (int)(filename - start);
 337             position = IN_FILE;
 338             start = ++filename;
 339             result->dir = start;
 340             break;
 341         case '\\':
 342         case '/':
 343             if (position == IN_NODE) {
 344                 result->nodelen = (int)(filename - start);
 345                 position = IN_FILE;
 346                 start = ++filename;
 347                 result->dir = start;
 348             } else if (position == IN_DEVICE) {
 349                 position = IN_FILE;
 350                 filename++;
 351                 result->dir = start;
 352                 result->dirlen = (int)(filename - start);
 353                 start = filename;
 354             } else {
 355                 filename++;
 356                 result->dirlen += (int)(filename - start);
 357                 start = filename;
 358             }
 359             break;
 360         case '\0':
 361             if (position == IN_NODE) {
 362                 result->nodelen = (int)(filename - start);
 363             } else {
 364                 if (filename - start > 0) {
 365                     if (assume_last_is_dir) {
 366                         if (position == IN_DEVICE) {
 367                             result->dir = start;
 368                             result->dirlen = 0;
 369                         }
 370                         result->dirlen += (int)(filename - start);
 371                     } else {
 372                         result->file = start;
 373                         result->filelen = (int)(filename - start);
 374                     }
 375                 }
 376             }
 377             break;
 378         default:
 379             filename++;
 380             break;
 381         }
 382     }
 383     while (last);
 384
 385     if (!result->nodelen)
 386         result->node = NULL;
 387     if (!result->devicelen)
 388         result->device = NULL;
 389     if (!result->dirlen)
 390         result->dir = NULL;
 391     if (!result->filelen)
 392         result->file = NULL;
 393
 394     return (result);
 395 }
 396
 397 static char *win32_joiner(DSO *dso, const struct file_st *file_split)
 398 {
 399     int len = 0, offset = 0;
 400     char *result = NULL;
 401     const char *start;
 402
 403     if (!file_split) {
 404         DSOerr(DSO_F_WIN32_JOINER, ERR_R_PASSED_NULL_PARAMETER);
 405         return (NULL);
 406     }
 407     if (file_split->node) {
 408         len += 2 + file_split->nodelen; /* 2 for starting \\ */
 409         if (file_split->predir || file_split->dir || file_split->file)
 410             len++;              /* 1 for ending \ */
 411     } else if (file_split->device) {
 412         len += file_split->devicelen + 1; /* 1 for ending : */
 413     }
 414     len += file_split->predirlen;
 415     if (file_split->predir && (file_split->dir || file_split->file)) {
 416         len++;                  /* 1 for ending \ */
 417     }
 418     len += file_split->dirlen;
 419     if (file_split->dir && file_split->file) {
 420         len++;                  /* 1 for ending \ */
 421     }
 422     len += file_split->filelen;
 423
 424     if (!len) {
 425         DSOerr(DSO_F_WIN32_JOINER, DSO_R_EMPTY_FILE_STRUCTURE);
 426         return (NULL);
 427     }
 428
 429     result = OPENSSL_malloc(len + 1);
 430     if (!result) {
 431         DSOerr(DSO_F_WIN32_JOINER, ERR_R_MALLOC_FAILURE);
 432         return (NULL);
 433     }
 434
 435     if (file_split->node) {
 436         strcpy(&result[offset], "\\\\");
 437         offset += 2;
 438         strncpy(&result[offset], file_split->node, file_split->nodelen);
 439         offset += file_split->nodelen;
 440         if (file_split->predir || file_split->dir || file_split->file) {
 441             result[offset] = '\\';
 442             offset++;
 443         }
 444     } else if (file_split->device) {
 445         strncpy(&result[offset], file_split->device, file_split->devicelen);
 446         offset += file_split->devicelen;
 447         result[offset] = ':';
 448         offset++;
 449     }
 450     start = file_split->predir;
 451     while (file_split->predirlen > (start - file_split->predir)) {
 452         const char *end = openssl_strnchr(start, '/',
 453                                           file_split->predirlen - (start -
 454                                                                    file_split->predir));
 455         if (!end)
 456             end = start
 457                 + file_split->predirlen - (start - file_split->predir);
 458         strncpy(&result[offset], start, end - start);
 459         offset += (int)(end - start);
 460         result[offset] = '\\';
 461         offset++;
 462         start = end + 1;
 463     }
 464     start = file_split->dir;
 465     while (file_split->dirlen > (start - file_split->dir)) {
 466         const char *end = openssl_strnchr(start, '/',
 467                                           file_split->dirlen - (start -
 468                                                                 file_split->dir));
 469         if (!end)
 470             end = start + file_split->dirlen - (start - file_split->dir);
 471         strncpy(&result[offset], start, end - start);
 472         offset += (int)(end - start);
 473         result[offset] = '\\';
 474         offset++;
 475         start = end + 1;
 476     }
 477     strncpy(&result[offset], file_split->file, file_split->filelen);
 478     offset += file_split->filelen;
 479     result[offset] = '\0';
 480     return (result);
 481 }
 482
 483 static char *win32_merger(DSO *dso, const char *filespec1,
 484                           const char *filespec2)
 485 {
 486     char *merged = NULL;
 487     struct file_st *filespec1_split = NULL;
 488     struct file_st *filespec2_split = NULL;
 489
 490     if (!filespec1 && !filespec2) {
 491         DSOerr(DSO_F_WIN32_MERGER, ERR_R_PASSED_NULL_PARAMETER);
 492         return (NULL);
 493     }
 494     if (!filespec2) {
 495         merged = OPENSSL_malloc(strlen(filespec1) + 1);
 496         if (!merged) {
 497             DSOerr(DSO_F_WIN32_MERGER, ERR_R_MALLOC_FAILURE);
 498             return (NULL);
 499         }
 500         strcpy(merged, filespec1);
 501     } else if (!filespec1) {
 502         merged = OPENSSL_malloc(strlen(filespec2) + 1);
 503         if (!merged) {
 504             DSOerr(DSO_F_WIN32_MERGER, ERR_R_MALLOC_FAILURE);
 505             return (NULL);
 506         }
 507         strcpy(merged, filespec2);
 508     } else {
 509         filespec1_split = win32_splitter(dso, filespec1, 0);
 510         if (!filespec1_split) {
 511             DSOerr(DSO_F_WIN32_MERGER, ERR_R_MALLOC_FAILURE);
 512             return (NULL);
 513         }
 514         filespec2_split = win32_splitter(dso, filespec2, 1);
 515         if (!filespec2_split) {
 516             DSOerr(DSO_F_WIN32_MERGER, ERR_R_MALLOC_FAILURE);
 517             OPENSSL_free(filespec1_split);
 518             return (NULL);
 519         }
 520
 521         /* Fill in into filespec1_split */
 522         if (!filespec1_split->node && !filespec1_split->device) {
 523             filespec1_split->node = filespec2_split->node;
 524             filespec1_split->nodelen = filespec2_split->nodelen;
 525             filespec1_split->device = filespec2_split->device;
 526             filespec1_split->devicelen = filespec2_split->devicelen;
 527         }
 528         if (!filespec1_split->dir) {
 529             filespec1_split->dir = filespec2_split->dir;
 530             filespec1_split->dirlen = filespec2_split->dirlen;
 531         } else if (filespec1_split->dir[0] != '\\'
 532                    && filespec1_split->dir[0] != '/') {
 533             filespec1_split->predir = filespec2_split->dir;
 534             filespec1_split->predirlen = filespec2_split->dirlen;
 535         }
 536         if (!filespec1_split->file) {
 537             filespec1_split->file = filespec2_split->file;
 538             filespec1_split->filelen = filespec2_split->filelen;
 539         }
 540
 541         merged = win32_joiner(dso, filespec1_split);
 542     }
 543     OPENSSL_free(filespec1_split);
 544     OPENSSL_free(filespec2_split);
 545     return (merged);
 546 }
 547
 548 static char *win32_name_converter(DSO *dso, const char *filename)
 549 {
 550     char *translated;
 551     int len, transform;
 552
 553     len = strlen(filename);
 554     transform = ((strstr(filename, "/") == NULL) &&
 555                  (strstr(filename, "\\") == NULL) &&
 556                  (strstr(filename, ":") == NULL));
 557     if (transform)
 558         /* We will convert this to "%s.dll" */
 559         translated = OPENSSL_malloc(len + 5);
 560     else
 561         /* We will simply duplicate filename */
 562         translated = OPENSSL_malloc(len + 1);
 563     if (translated == NULL) {
 564         DSOerr(DSO_F_WIN32_NAME_CONVERTER, DSO_R_NAME_TRANSLATION_FAILED);
 565         return (NULL);
 566     }
 567     if (transform)
 568         sprintf(translated, "%s.dll", filename);
 569     else
 570         sprintf(translated, "%s", filename);
 571     return (translated);
 572 }
 573
 574 static const char *openssl_strnchr(const char *string, int c, size_t len)
 575 {
 576     size_t i;
 577     const char *p;
 578     for (i = 0, p = string; i < len && *p; i++, p++) {
 579         if (*p == c)
 580             return p;
 581     }
 582     return NULL;
 583 }
 584
 585 # include <tlhelp32.h>
 586 # ifdef _WIN32_WCE
 587 #  define DLLNAME "TOOLHELP.DLL"
 588 # else
 589 #  ifdef MODULEENTRY32
 590 #   undef MODULEENTRY32         /* unmask the ASCII version! */
 591 #  endif
 592 #  define DLLNAME "KERNEL32.DLL"
 593 # endif
 594
 595 typedef HANDLE(WINAPI *CREATETOOLHELP32SNAPSHOT) (DWORD, DWORD);
 596 typedef BOOL(WINAPI *CLOSETOOLHELP32SNAPSHOT) (HANDLE);
 597 typedef BOOL(WINAPI *MODULE32) (HANDLE, MODULEENTRY32 *);
 598
 599 static int win32_pathbyaddr(void *addr, char *path, int sz)
 600 {
 601     HMODULE dll;
 602     HANDLE hModuleSnap = INVALID_HANDLE_VALUE;
 603     MODULEENTRY32 me32;
 604     CREATETOOLHELP32SNAPSHOT create_snap;
 605     CLOSETOOLHELP32SNAPSHOT close_snap;
 606     MODULE32 module_first, module_next;
 607
 608     if (addr == NULL) {
 609         union {
 610             int (*f) (void *, char *, int);
 611             void *p;
 612         } t = {
 613             win32_pathbyaddr
 614         };
 615         addr = t.p;
 616     }
 617
 618     dll = LoadLibrary(TEXT(DLLNAME));
 619     if (dll == NULL) {
 620         DSOerr(DSO_F_WIN32_PATHBYADDR, DSO_R_UNSUPPORTED);
 621         return -1;
 622     }
 623
 624     create_snap = (CREATETOOLHELP32SNAPSHOT)
 625         GetProcAddress(dll, "CreateToolhelp32Snapshot");
 626     if (create_snap == NULL) {
 627         FreeLibrary(dll);
 628         DSOerr(DSO_F_WIN32_PATHBYADDR, DSO_R_UNSUPPORTED);
 629         return -1;
 630     }
 631     /* We take the rest for granted... */
 632 # ifdef _WIN32_WCE
 633     close_snap = (CLOSETOOLHELP32SNAPSHOT)
 634         GetProcAddress(dll, "CloseToolhelp32Snapshot");
 635 # else
 636     close_snap = (CLOSETOOLHELP32SNAPSHOT) CloseHandle;
 637 # endif
 638     module_first = (MODULE32) GetProcAddress(dll, "Module32First");
 639     module_next = (MODULE32) GetProcAddress(dll, "Module32Next");
 640
 641     hModuleSnap = (*create_snap) (TH32CS_SNAPMODULE, 0);
 642     if (hModuleSnap == INVALID_HANDLE_VALUE) {
 643         FreeLibrary(dll);
 644         DSOerr(DSO_F_WIN32_PATHBYADDR, DSO_R_UNSUPPORTED);
 645         return -1;
 646     }
 647
 648     me32.dwSize = sizeof(me32);
 649
 650     if (!(*module_first) (hModuleSnap, &me32)) {
 651         (*close_snap) (hModuleSnap);
 652         FreeLibrary(dll);
 653         DSOerr(DSO_F_WIN32_PATHBYADDR, DSO_R_FAILURE);
 654         return -1;
 655     }
 656
 657     do {
 658         if ((BYTE *) addr >= me32.modBaseAddr &&
 659             (BYTE *) addr < me32.modBaseAddr + me32.modBaseSize) {
 660             (*close_snap) (hModuleSnap);
 661             FreeLibrary(dll);
 662 # ifdef _WIN32_WCE
 663 #  if _WIN32_WCE >= 101
 664             return WideCharToMultiByte(CP_ACP, 0, me32.szExePath, -1,
 665                                        path, sz, NULL, NULL);
 666 #  else
 667             {
 668                 int i, len = (int)wcslen(me32.szExePath);
 669                 if (sz <= 0)
 670                     return len + 1;
 671                 if (len >= sz)
 672                     len = sz - 1;
 673                 for (i = 0; i < len; i++)
 674                     path[i] = (char)me32.szExePath[i];
 675                 path[len++] = 0;
 676                 return len;
 677             }
 678 #  endif
 679 # else
 680             {
 681                 int len = (int)strlen(me32.szExePath);
 682                 if (sz <= 0)
 683                     return len + 1;
 684                 if (len >= sz)
 685                     len = sz - 1;
 686                 memcpy(path, me32.szExePath, len);
 687                 path[len++] = 0;
 688                 return len;
 689             }
 690 # endif
 691         }
 692     } while ((*module_next) (hModuleSnap, &me32));
 693
 694     (*close_snap) (hModuleSnap);
 695     FreeLibrary(dll);
 696     return 0;
 697 }
 698
 699 static void *win32_globallookup(const char *name)
 700 {
 701     HMODULE dll;
 702     HANDLE hModuleSnap = INVALID_HANDLE_VALUE;
 703     MODULEENTRY32 me32;
 704     CREATETOOLHELP32SNAPSHOT create_snap;
 705     CLOSETOOLHELP32SNAPSHOT close_snap;
 706     MODULE32 module_first, module_next;
 707     FARPROC ret = NULL;
 708
 709     dll = LoadLibrary(TEXT(DLLNAME));
 710     if (dll == NULL) {
 711         DSOerr(DSO_F_WIN32_GLOBALLOOKUP, DSO_R_UNSUPPORTED);
 712         return NULL;
 713     }
 714
 715     create_snap = (CREATETOOLHELP32SNAPSHOT)
 716         GetProcAddress(dll, "CreateToolhelp32Snapshot");
 717     if (create_snap == NULL) {
 718         FreeLibrary(dll);
 719         DSOerr(DSO_F_WIN32_GLOBALLOOKUP, DSO_R_UNSUPPORTED);
 720         return NULL;
 721     }
 722     /* We take the rest for granted... */
 723 # ifdef _WIN32_WCE
 724     close_snap = (CLOSETOOLHELP32SNAPSHOT)
 725         GetProcAddress(dll, "CloseToolhelp32Snapshot");
 726 # else
 727     close_snap = (CLOSETOOLHELP32SNAPSHOT) CloseHandle;
 728 # endif
 729     module_first = (MODULE32) GetProcAddress(dll, "Module32First");
 730     module_next = (MODULE32) GetProcAddress(dll, "Module32Next");
 731
 732     hModuleSnap = (*create_snap) (TH32CS_SNAPMODULE, 0);
 733     if (hModuleSnap == INVALID_HANDLE_VALUE) {
 734         FreeLibrary(dll);
 735         DSOerr(DSO_F_WIN32_GLOBALLOOKUP, DSO_R_UNSUPPORTED);
 736         return NULL;
 737     }
 738
 739     me32.dwSize = sizeof(me32);
 740
 741     if (!(*module_first) (hModuleSnap, &me32)) {
 742         (*close_snap) (hModuleSnap);
 743         FreeLibrary(dll);
 744         return NULL;
 745     }
 746
 747     do {
 748         if ((ret = GetProcAddress(me32.hModule, name))) {
 749             (*close_snap) (hModuleSnap);
 750             FreeLibrary(dll);
 751             return ret;
 752         }
 753     } while ((*module_next) (hModuleSnap, &me32));
 754
 755     (*close_snap) (hModuleSnap);
 756     FreeLibrary(dll);
 757     return NULL;
 758 }
 759 #endif                          /* DSO_WIN32 */