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         fnamw = (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 static void *win32_globallookup(const char *name);
 133
 134 static const char *openssl_strnchr(const char *string, int c, size_t len);
 135
 136 static DSO_METHOD dso_meth_win32 = {
 137         "OpenSSL 'win32' shared library method",
 138         win32_load,
 139         win32_unload,
 140         win32_bind_var,
 141         win32_bind_func,
 142 /* For now, "unbind" doesn't exist */
 143 #if 0
 144         NULL, /* unbind_var */
 145         NULL, /* unbind_func */
 146 #endif
 147         NULL, /* ctrl */
 148         win32_name_converter,
 149         win32_merger,
 150         NULL, /* init */
 151         NULL, /* finish */
 152         win32_pathbyaddr,
 153         win32_globallookup
 154         };
 155
 156 DSO_METHOD *DSO_METHOD_win32(void)
 157         {
 158         return(&dso_meth_win32);
 159         }
 160
 161 /* For this DSO_METHOD, our meth_data STACK will contain;
 162  * (i) a pointer to the handle (HINSTANCE) returned from
 163  *     LoadLibrary(), and copied.
 164  */
 165
 166 static int win32_load(DSO *dso)
 167         {
 168         HINSTANCE h = NULL, *p = NULL;
 169         /* See applicable comments from dso_dl.c */
 170         char *filename = DSO_convert_filename(dso, NULL);
 171
 172         if(filename == NULL)
 173                 {
 174                 DSOerr(DSO_F_WIN32_LOAD,DSO_R_NO_FILENAME);
 175                 goto err;
 176                 }
 177         h = LoadLibraryA(filename);
 178         if(h == NULL)
 179                 {
 180                 DSOerr(DSO_F_WIN32_LOAD,DSO_R_LOAD_FAILED);
 181                 ERR_add_error_data(3, "filename(", filename, ")");
 182                 goto err;
 183                 }
 184         p = (HINSTANCE *)OPENSSL_malloc(sizeof(HINSTANCE));
 185         if(p == NULL)
 186                 {
 187                 DSOerr(DSO_F_WIN32_LOAD,ERR_R_MALLOC_FAILURE);
 188                 goto err;
 189                 }
 190         *p = h;
 191         if(!sk_void_push(dso->meth_data, p))
 192                 {
 193                 DSOerr(DSO_F_WIN32_LOAD,DSO_R_STACK_ERROR);
 194                 goto err;
 195                 }
 196         /* Success */
 197         dso->loaded_filename = filename;
 198         return(1);
 199 err:
 200         /* Cleanup !*/
 201         if(filename != NULL)
 202                 OPENSSL_free(filename);
 203         if(p != NULL)
 204                 OPENSSL_free(p);
 205         if(h != NULL)
 206                 FreeLibrary(h);
 207         return(0);
 208         }
 209
 210 static int win32_unload(DSO *dso)
 211         {
 212         HINSTANCE *p;
 213         if(dso == NULL)
 214                 {
 215                 DSOerr(DSO_F_WIN32_UNLOAD,ERR_R_PASSED_NULL_PARAMETER);
 216                 return(0);
 217                 }
 218         if(sk_void_num(dso->meth_data) < 1)
 219                 return(1);
 220         p = sk_void_pop(dso->meth_data);
 221         if(p == NULL)
 222                 {
 223                 DSOerr(DSO_F_WIN32_UNLOAD,DSO_R_NULL_HANDLE);
 224                 return(0);
 225                 }
 226         if(!FreeLibrary(*p))
 227                 {
 228                 DSOerr(DSO_F_WIN32_UNLOAD,DSO_R_UNLOAD_FAILED);
 229                 /* We should push the value back onto the stack in
 230                  * case of a retry. */
 231                 sk_void_push(dso->meth_data, p);
 232                 return(0);
 233                 }
 234         /* Cleanup */
 235         OPENSSL_free(p);
 236         return(1);
 237         }
 238
 239 /* Using GetProcAddress for variables? TODO: Check this out in
 240  * the Win32 API docs, there's probably a variant for variables. */
 241 static void *win32_bind_var(DSO *dso, const char *symname)
 242         {
 243         HINSTANCE *ptr;
 244         void *sym;
 245
 246         if((dso == NULL) || (symname == NULL))
 247                 {
 248                 DSOerr(DSO_F_WIN32_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER);
 249                 return(NULL);
 250                 }
 251         if(sk_void_num(dso->meth_data) < 1)
 252                 {
 253                 DSOerr(DSO_F_WIN32_BIND_VAR,DSO_R_STACK_ERROR);
 254                 return(NULL);
 255                 }
 256         ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
 257         if(ptr == NULL)
 258                 {
 259                 DSOerr(DSO_F_WIN32_BIND_VAR,DSO_R_NULL_HANDLE);
 260                 return(NULL);
 261                 }
 262         sym = GetProcAddress(*ptr, symname);
 263         if(sym == NULL)
 264                 {
 265                 DSOerr(DSO_F_WIN32_BIND_VAR,DSO_R_SYM_FAILURE);
 266                 ERR_add_error_data(3, "symname(", symname, ")");
 267                 return(NULL);
 268                 }
 269         return(sym);
 270         }
 271
 272 static DSO_FUNC_TYPE win32_bind_func(DSO *dso, const char *symname)
 273         {
 274         HINSTANCE *ptr;
 275         void *sym;
 276
 277         if((dso == NULL) || (symname == NULL))
 278                 {
 279                 DSOerr(DSO_F_WIN32_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER);
 280                 return(NULL);
 281                 }
 282         if(sk_void_num(dso->meth_data) < 1)
 283                 {
 284                 DSOerr(DSO_F_WIN32_BIND_FUNC,DSO_R_STACK_ERROR);
 285                 return(NULL);
 286                 }
 287         ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
 288         if(ptr == NULL)
 289                 {
 290                 DSOerr(DSO_F_WIN32_BIND_FUNC,DSO_R_NULL_HANDLE);
 291                 return(NULL);
 292                 }
 293         sym = GetProcAddress(*ptr, symname);
 294         if(sym == NULL)
 295                 {
 296                 DSOerr(DSO_F_WIN32_BIND_FUNC,DSO_R_SYM_FAILURE);
 297                 ERR_add_error_data(3, "symname(", symname, ")");
 298                 return(NULL);
 299                 }
 300         return((DSO_FUNC_TYPE)sym);
 301         }
 302
 303 struct file_st
 304         {
 305         const char *node; int nodelen;
 306         const char *device; int devicelen;
 307         const char *predir; int predirlen;
 308         const char *dir; int dirlen;
 309         const char *file; int filelen;
 310         };
 311
 312 static struct file_st *win32_splitter(DSO *dso, const char *filename,
 313         int assume_last_is_dir)
 314         {
 315         struct file_st *result = NULL;
 316         enum { IN_NODE, IN_DEVICE, IN_FILE } position;
 317         const char *start = filename;
 318         char last;
 319
 320         if (!filename)
 321                 {
 322                 DSOerr(DSO_F_WIN32_SPLITTER,DSO_R_NO_FILENAME);
 323                 /*goto err;*/
 324                 return(NULL);
 325                 }
 326
 327         result = OPENSSL_malloc(sizeof(struct file_st));
 328         if(result == NULL)
 329                 {
 330                 DSOerr(DSO_F_WIN32_SPLITTER,
 331                         ERR_R_MALLOC_FAILURE);
 332                 return(NULL);
 333                 }
 334
 335         memset(result, 0, sizeof(struct file_st));
 336         position = IN_DEVICE;
 337
 338         if((filename[0] == '\\' && filename[1] == '\\')
 339                 || (filename[0] == '/' && filename[1] == '/'))
 340                 {
 341                 position = IN_NODE;
 342                 filename += 2;
 343                 start = filename;
 344                 result->node = start;
 345                 }
 346
 347         do
 348                 {
 349                 last = filename[0];
 350                 switch(last)
 351                         {
 352                 case ':':
 353                         if(position != IN_DEVICE)
 354                                 {
 355                                 DSOerr(DSO_F_WIN32_SPLITTER,
 356                                         DSO_R_INCORRECT_FILE_SYNTAX);
 357                                 /*goto err;*/
 358                                 return(NULL);
 359                                 }
 360                         result->device = start;
 361                         result->devicelen = filename - start;
 362                         position = IN_FILE;
 363                         start = ++filename;
 364                         result->dir = start;
 365                         break;
 366                 case '\\':
 367                 case '/':
 368                         if(position == IN_NODE)
 369                                 {
 370                                 result->nodelen = filename - start;
 371                                 position = IN_FILE;
 372                                 start = ++filename;
 373                                 result->dir = start;
 374                                 }
 375                         else if(position == IN_DEVICE)
 376                                 {
 377                                 position = IN_FILE;
 378                                 filename++;
 379                                 result->dir = start;
 380                                 result->dirlen = filename - start;
 381                                 start = filename;
 382                                 }
 383                         else
 384                                 {
 385                                 filename++;
 386                                 result->dirlen += filename - start;
 387                                 start = filename;
 388                                 }
 389                         break;
 390                 case '\0':
 391                         if(position == IN_NODE)
 392                                 {
 393                                 result->nodelen = filename - start;
 394                                 }
 395                         else
 396                                 {
 397                                 if(filename - start > 0)
 398                                         {
 399                                         if (assume_last_is_dir)
 400                                                 {
 401                                                 if (position == IN_DEVICE)
 402                                                         {
 403                                                         result->dir = start;
 404                                                         result->dirlen = 0;
 405                                                         }
 406                                                 result->dirlen +=
 407                                                         filename - start;
 408                                                 }
 409                                         else
 410                                                 {
 411                                                 result->file = start;
 412                                                 result->filelen =
 413                                                         filename - start;
 414                                                 }
 415                                         }
 416                                 }
 417                         break;
 418                 default:
 419                         filename++;
 420                         break;
 421                         }
 422                 }
 423         while(last);
 424
 425         if(!result->nodelen) result->node = NULL;
 426         if(!result->devicelen) result->device = NULL;
 427         if(!result->dirlen) result->dir = NULL;
 428         if(!result->filelen) result->file = NULL;
 429
 430         return(result);
 431         }
 432
 433 static char *win32_joiner(DSO *dso, const struct file_st *file_split)
 434         {
 435         int len = 0, offset = 0;
 436         char *result = NULL;
 437         const char *start;
 438
 439         if(!file_split)
 440                 {
 441                 DSOerr(DSO_F_WIN32_JOINER,
 442                                 ERR_R_PASSED_NULL_PARAMETER);
 443                 return(NULL);
 444                 }
 445         if(file_split->node)
 446                 {
 447                 len += 2 + file_split->nodelen; /* 2 for starting \\ */
 448                 if(file_split->predir || file_split->dir || file_split->file)
 449                         len++;  /* 1 for ending \ */
 450                 }
 451         else if(file_split->device)
 452                 {
 453                 len += file_split->devicelen + 1; /* 1 for ending : */
 454                 }
 455         len += file_split->predirlen;
 456         if(file_split->predir && (file_split->dir || file_split->file))
 457                 {
 458                 len++;  /* 1 for ending \ */
 459                 }
 460         len += file_split->dirlen;
 461         if(file_split->dir && file_split->file)
 462                 {
 463                 len++;  /* 1 for ending \ */
 464                 }
 465         len += file_split->filelen;
 466
 467         if(!len)
 468                 {
 469                 DSOerr(DSO_F_WIN32_JOINER, DSO_R_EMPTY_FILE_STRUCTURE);
 470                 return(NULL);
 471                 }
 472
 473         result = OPENSSL_malloc(len + 1);
 474         if (!result)
 475                 {
 476                 DSOerr(DSO_F_WIN32_JOINER,
 477                         ERR_R_MALLOC_FAILURE);
 478                 return(NULL);
 479                 }
 480
 481         if(file_split->node)
 482                 {
 483                 strcpy(&result[offset], "\\\\"); offset += 2;
 484                 strncpy(&result[offset], file_split->node,
 485                         file_split->nodelen); offset += file_split->nodelen;
 486                 if(file_split->predir || file_split->dir || file_split->file)
 487                         {
 488                         result[offset] = '\\'; offset++;
 489                         }
 490                 }
 491         else if(file_split->device)
 492                 {
 493                 strncpy(&result[offset], file_split->device,
 494                         file_split->devicelen); offset += file_split->devicelen;
 495                 result[offset] = ':'; offset++;
 496                 }
 497         start = file_split->predir;
 498         while(file_split->predirlen > (start - file_split->predir))
 499                 {
 500                 const char *end = openssl_strnchr(start, '/',
 501                         file_split->predirlen - (start - file_split->predir));
 502                 if(!end)
 503                         end = start
 504                                 + file_split->predirlen
 505                                 - (start - file_split->predir);
 506                 strncpy(&result[offset], start,
 507                         end - start); offset += end - start;
 508                 result[offset] = '\\'; offset++;
 509                 start = end + 1;
 510                 }
 511 #if 0 /* Not needed, since the directory converter above already appeneded
 512          a backslash */
 513         if(file_split->predir && (file_split->dir || file_split->file))
 514                 {
 515                 result[offset] = '\\'; offset++;
 516                 }
 517 #endif
 518         start = file_split->dir;
 519         while(file_split->dirlen > (start - file_split->dir))
 520                 {
 521                 const char *end = openssl_strnchr(start, '/',
 522                         file_split->dirlen - (start - file_split->dir));
 523                 if(!end)
 524                         end = start
 525                                 + file_split->dirlen
 526                                 - (start - file_split->dir);
 527                 strncpy(&result[offset], start,
 528                         end - start); offset += end - start;
 529                 result[offset] = '\\'; offset++;
 530                 start = end + 1;
 531                 }
 532 #if 0 /* Not needed, since the directory converter above already appeneded
 533          a backslash */
 534         if(file_split->dir && file_split->file)
 535                 {
 536                 result[offset] = '\\'; offset++;
 537                 }
 538 #endif
 539         strncpy(&result[offset], file_split->file,
 540                 file_split->filelen); offset += file_split->filelen;
 541         result[offset] = '\0';
 542         return(result);
 543         }
 544
 545 static char *win32_merger(DSO *dso, const char *filespec1, const char *filespec2)
 546         {
 547         char *merged = NULL;
 548         struct file_st *filespec1_split = NULL;
 549         struct file_st *filespec2_split = NULL;
 550
 551         if(!filespec1 && !filespec2)
 552                 {
 553                 DSOerr(DSO_F_WIN32_MERGER,
 554                                 ERR_R_PASSED_NULL_PARAMETER);
 555                 return(NULL);
 556                 }
 557         if (!filespec2)
 558                 {
 559                 merged = OPENSSL_malloc(strlen(filespec1) + 1);
 560                 if(!merged)
 561                         {
 562                         DSOerr(DSO_F_WIN32_MERGER,
 563                                 ERR_R_MALLOC_FAILURE);
 564                         return(NULL);
 565                         }
 566                 strcpy(merged, filespec1);
 567                 }
 568         else if (!filespec1)
 569                 {
 570                 merged = OPENSSL_malloc(strlen(filespec2) + 1);
 571                 if(!merged)
 572                         {
 573                         DSOerr(DSO_F_WIN32_MERGER,
 574                                 ERR_R_MALLOC_FAILURE);
 575                         return(NULL);
 576                         }
 577                 strcpy(merged, filespec2);
 578                 }
 579         else
 580                 {
 581                 filespec1_split = win32_splitter(dso, filespec1, 0);
 582                 if (!filespec1_split)
 583                         {
 584                         DSOerr(DSO_F_WIN32_MERGER,
 585                                 ERR_R_MALLOC_FAILURE);
 586                         return(NULL);
 587                         }
 588                 filespec2_split = win32_splitter(dso, filespec2, 1);
 589                 if (!filespec2_split)
 590                         {
 591                         DSOerr(DSO_F_WIN32_MERGER,
 592                                 ERR_R_MALLOC_FAILURE);
 593                         OPENSSL_free(filespec1_split);
 594                         return(NULL);
 595                         }
 596
 597                 /* Fill in into filespec1_split */
 598                 if (!filespec1_split->node && !filespec1_split->device)
 599                         {
 600                         filespec1_split->node = filespec2_split->node;
 601                         filespec1_split->nodelen = filespec2_split->nodelen;
 602                         filespec1_split->device = filespec2_split->device;
 603                         filespec1_split->devicelen = filespec2_split->devicelen;
 604                         }
 605                 if (!filespec1_split->dir)
 606                         {
 607                         filespec1_split->dir = filespec2_split->dir;
 608                         filespec1_split->dirlen = filespec2_split->dirlen;
 609                         }
 610                 else if (filespec1_split->dir[0] != '\\'
 611                         && filespec1_split->dir[0] != '/')
 612                         {
 613                         filespec1_split->predir = filespec2_split->dir;
 614                         filespec1_split->predirlen = filespec2_split->dirlen;
 615                         }
 616                 if (!filespec1_split->file)
 617                         {
 618                         filespec1_split->file = filespec2_split->file;
 619                         filespec1_split->filelen = filespec2_split->filelen;
 620                         }
 621
 622                 merged = win32_joiner(dso, filespec1_split);
 623                 }
 624         return(merged);
 625         }
 626
 627 static char *win32_name_converter(DSO *dso, const char *filename)
 628         {
 629         char *translated;
 630         int len, transform;
 631
 632         len = strlen(filename);
 633         transform = ((strstr(filename, "/") == NULL) &&
 634                         (strstr(filename, "\\") == NULL) &&
 635                         (strstr(filename, ":") == NULL));
 636         if(transform)
 637                 /* We will convert this to "%s.dll" */
 638                 translated = OPENSSL_malloc(len + 5);
 639         else
 640                 /* We will simply duplicate filename */
 641                 translated = OPENSSL_malloc(len + 1);
 642         if(translated == NULL)
 643                 {
 644                 DSOerr(DSO_F_WIN32_NAME_CONVERTER,
 645                                 DSO_R_NAME_TRANSLATION_FAILED);
 646                 return(NULL);
 647                 }
 648         if(transform)
 649                 sprintf(translated, "%s.dll", filename);
 650         else
 651                 sprintf(translated, "%s", filename);
 652         return(translated);
 653         }
 654
 655 static const char *openssl_strnchr(const char *string, int c, size_t len)
 656         {
 657         size_t i;
 658         const char *p;
 659         for (i = 0, p = string; i < len && *p; i++, p++)
 660                 {
 661                 if (*p == c)
 662                         return p;
 663                 }
 664         return NULL;
 665         }
 666
 667 #include <tlhelp32.h>
 668 #ifdef _WIN32_WCE
 669 # define DLLNAME "TOOLHELP.DLL"
 670 #else
 671 # ifdef MODULEENTRY32
 672 # undef MODULEENTRY32   /* unmask the ASCII version! */
 673 # endif
 674 # define DLLNAME "KERNEL32.DLL"
 675 #endif
 676
 677 typedef HANDLE (WINAPI *CREATETOOLHELP32SNAPSHOT)(DWORD, DWORD);
 678 typedef BOOL (WINAPI *CLOSETOOLHELP32SNAPSHOT)(HANDLE);
 679 typedef BOOL (WINAPI *MODULE32)(HANDLE, MODULEENTRY32 *);
 680
 681 static int win32_pathbyaddr(void *addr,char *path,int sz)
 682         {
 683         HMODULE dll;
 684         HANDLE hModuleSnap = INVALID_HANDLE_VALUE;
 685         MODULEENTRY32 me32;
 686         CREATETOOLHELP32SNAPSHOT create_snap;
 687         CLOSETOOLHELP32SNAPSHOT  close_snap;
 688         MODULE32 module_first, module_next;
 689         int len;
 690
 691         if (addr == NULL)
 692                 {
 693                 union   { int(*f)(void*,char*,int); void *p; } t =
 694                         { win32_pathbyaddr };
 695                 addr = t.p;
 696                 }
 697
 698         dll = LoadLibrary(TEXT(DLLNAME));
 699         if (dll == NULL)
 700                 {
 701                 DSOerr(DSO_F_WIN32_PATHBYADDR,DSO_R_UNSUPPORTED);
 702                 return -1;
 703                 }
 704
 705         create_snap = (CREATETOOLHELP32SNAPSHOT)
 706                 GetProcAddress(dll,"CreateToolhelp32Snapshot");
 707         if (create_snap == NULL)
 708                 {
 709                 FreeLibrary(dll);
 710                 DSOerr(DSO_F_WIN32_PATHBYADDR,DSO_R_UNSUPPORTED);
 711                 return -1;
 712                 }
 713         /* We take the rest for granted... */
 714 #ifdef _WIN32_WCE
 715         close_snap = (CLOSETOOLHELP32SNAPSHOT)
 716                 GetProcAddress(dll,"CloseToolhelp32Snapshot");
 717 #else
 718         close_snap = (CLOSETOOLHELP32SNAPSHOT)CloseHandle;
 719 #endif
 720         module_first = (MODULE32)GetProcAddress(dll,"Module32First");
 721         module_next  = (MODULE32)GetProcAddress(dll,"Module32Next");
 722
 723         hModuleSnap = (*create_snap)(TH32CS_SNAPMODULE,0);
 724         if( hModuleSnap == INVALID_HANDLE_VALUE )
 725                 {
 726                 FreeLibrary(dll);
 727                 DSOerr(DSO_F_WIN32_PATHBYADDR,DSO_R_UNSUPPORTED);
 728                 return -1;
 729                 }
 730
 731         me32.dwSize = sizeof(me32);
 732
 733         if(!(*module_first)(hModuleSnap,&me32))
 734                 {
 735                 (*close_snap)(hModuleSnap);
 736                 FreeLibrary(dll);
 737                 DSOerr(DSO_F_WIN32_PATHBYADDR,DSO_R_FAILURE);
 738                 return -1;
 739                 }
 740
 741         do      {
 742                 if ((BYTE *)addr >= me32.modBaseAddr &&
 743                     (BYTE *)addr <  me32.modBaseAddr+me32.modBaseSize)
 744                         {
 745                         (*close_snap)(hModuleSnap);
 746                         FreeLibrary(dll);
 747 #ifdef _WIN32_WCE
 748 # if _WIN32_WCE >= 101
 749                         return WideCharToMultiByte(CP_ACP,0,me32.szExePath,-1,
 750                                                         path,sz,NULL,NULL);
 751 # else
 752                         len = (int)wcslen(me32.szExePath);
 753                         if (sz <= 0) return len+1;
 754                         if (len >= sz) len=sz-1;
 755                         for(i=0;i<len;i++)
 756                                 path[i] = (char)me32.szExePath[i];
 757                         path[len++] = 0;
 758                         return len;
 759 # endif
 760 #else
 761                         len = (int)strlen(me32.szExePath);
 762                         if (sz <= 0) return len+1;
 763                         if (len >= sz) len=sz-1;
 764                         memcpy(path,me32.szExePath,len);
 765                         path[len++] = 0;
 766                         return len;
 767 #endif
 768                         }
 769                 } while((*module_next)(hModuleSnap, &me32));
 770
 771         (*close_snap)(hModuleSnap);
 772         FreeLibrary(dll);
 773         return 0;
 774         }
 775
 776 static void *win32_globallookup(const char *name)
 777         {
 778         HMODULE dll;
 779         HANDLE hModuleSnap = INVALID_HANDLE_VALUE;
 780         MODULEENTRY32 me32;
 781         CREATETOOLHELP32SNAPSHOT create_snap;
 782         CLOSETOOLHELP32SNAPSHOT  close_snap;
 783         MODULE32 module_first, module_next;
 784         FARPROC ret=NULL;
 785
 786         dll = LoadLibrary(TEXT(DLLNAME));
 787         if (dll == NULL)
 788                 {
 789                 DSOerr(DSO_F_WIN32_GLOBALLOOKUP,DSO_R_UNSUPPORTED);
 790                 return NULL;
 791                 }
 792
 793         create_snap = (CREATETOOLHELP32SNAPSHOT)
 794                 GetProcAddress(dll,"CreateToolhelp32Snapshot");
 795         if (create_snap == NULL)
 796                 {
 797                 FreeLibrary(dll);
 798                 DSOerr(DSO_F_WIN32_GLOBALLOOKUP,DSO_R_UNSUPPORTED);
 799                 return NULL;
 800                 }
 801         /* We take the rest for granted... */
 802 #ifdef _WIN32_WCE
 803         close_snap = (CLOSETOOLHELP32SNAPSHOT)
 804                 GetProcAddress(dll,"CloseToolhelp32Snapshot");
 805 #else
 806         close_snap = (CLOSETOOLHELP32SNAPSHOT)CloseHandle;
 807 #endif
 808         module_first = (MODULE32)GetProcAddress(dll,"Module32First");
 809         module_next  = (MODULE32)GetProcAddress(dll,"Module32Next");
 810
 811         hModuleSnap = (*create_snap)(TH32CS_SNAPMODULE,0);
 812         if( hModuleSnap == INVALID_HANDLE_VALUE )
 813                 {
 814                 FreeLibrary(dll);
 815                 DSOerr(DSO_F_WIN32_GLOBALLOOKUP,DSO_R_UNSUPPORTED);
 816                 return NULL;
 817                 }
 818
 819         me32.dwSize = sizeof(me32);
 820
 821         if (!(*module_first)(hModuleSnap,&me32))
 822                 {
 823                 (*close_snap)(hModuleSnap);
 824                 FreeLibrary(dll);
 825                 return NULL;
 826                 }
 827
 828         do      {
 829                 if ((ret = GetProcAddress(me32.hModule,name)))
 830                         {
 831                         (*close_snap)(hModuleSnap);
 832                         FreeLibrary(dll);
 833                         return ret;
 834                         }
 835                 } while((*module_next)(hModuleSnap,&me32));
 836
 837         (*close_snap)(hModuleSnap);
 838         FreeLibrary(dll);
 839         return NULL;
 840         }
 841 #endif /* DSO_WIN32 */