summaryrefslogtreecommitdiff
path: root/src/tool_doswin.c
blob: a64a81633fe4a16ac88185c4defebb353601868e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
 *
 * This software is licensed as described in the file COPYING, which
 * you should have received as part of this distribution. The terms
 * are also available at https://curl.haxx.se/docs/copyright.html.
 *
 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
 * copies of the Software, and permit persons to whom the Software is
 * furnished to do so, under the terms of the COPYING file.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ***************************************************************************/
#include "tool_setup.h"

#if defined(MSDOS) || defined(WIN32)

#if defined(HAVE_LIBGEN_H) && defined(HAVE_BASENAME)
#  include <libgen.h>
#endif

#ifdef WIN32
#  include <tlhelp32.h>
#  include "tool_cfgable.h"
#  include "tool_libinfo.h"
#endif

#include "tool_bname.h"
#include "tool_doswin.h"

#include "memdebug.h" /* keep this as LAST include */

#ifdef WIN32
#  undef  PATH_MAX
#  define PATH_MAX MAX_PATH
#endif

#ifndef S_ISCHR
#  ifdef S_IFCHR
#    define S_ISCHR(m) (((m) & S_IFMT) == S_IFCHR)
#  else
#    define S_ISCHR(m) (0) /* cannot tell if file is a device */
#  endif
#endif

#ifdef WIN32
#  define _use_lfn(f) (1)   /* long file names always available */
#elif !defined(__DJGPP__) || (__DJGPP__ < 2)  /* DJGPP 2.0 has _use_lfn() */
#  define _use_lfn(f) (0)  /* long file names never available */
#elif defined(__DJGPP__)
#  include <fcntl.h>                /* _use_lfn(f) prototype */
#endif

#ifndef UNITTESTS
static SANITIZEcode truncate_dryrun(const char *path,
                                    const size_t truncate_pos);
#ifdef MSDOS
static SANITIZEcode msdosify(char **const sanitized, const char *file_name,
                             int flags);
#endif
static SANITIZEcode rename_if_reserved_dos_device_name(char **const sanitized,
                                                       const char *file_name,
                                                       int flags);
#endif /* !UNITTESTS (static declarations used if no unit tests) */


/*
Sanitize a file or path name.

All banned characters are replaced by underscores, for example:
f?*foo => f__foo
f:foo::$DATA => f_foo__$DATA
f:\foo:bar => f__foo_bar
f:\foo:bar => f:\foo:bar   (flag SANITIZE_ALLOW_PATH)

This function was implemented according to the guidelines in 'Naming Files,
Paths, and Namespaces' section 'Naming Conventions'.
https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247.aspx

Flags
-----
SANITIZE_ALLOW_COLONS:     Allow colons.
Without this flag colons are sanitized.

SANITIZE_ALLOW_PATH:       Allow path separators and colons.
Without this flag path separators and colons are sanitized.

SANITIZE_ALLOW_RESERVED:   Allow reserved device names.
Without this flag a reserved device name is renamed (COM1 => _COM1) unless it's
in a UNC prefixed path.

SANITIZE_ALLOW_TRUNCATE:   Allow truncating a long filename.
Without this flag if the sanitized filename or path will be too long an error
occurs. With this flag the filename --and not any other parts of the path-- may
be truncated to at least a single character. A filename followed by an
alternate data stream (ADS) cannot be truncated in any case.

Success: (SANITIZE_ERR_OK) *sanitized points to a sanitized copy of file_name.
Failure: (!= SANITIZE_ERR_OK) *sanitized is NULL.
*/
SANITIZEcode sanitize_file_name(char **const sanitized, const char *file_name,
                                int flags)
{
  char *p, *target;
  size_t len;
  SANITIZEcode sc;
  size_t max_sanitized_len;

  if(!sanitized)
    return SANITIZE_ERR_BAD_ARGUMENT;

  *sanitized = NULL;

  if(!file_name)
    return SANITIZE_ERR_BAD_ARGUMENT;

  if((flags & SANITIZE_ALLOW_PATH)) {
#ifndef MSDOS
    if(file_name[0] == '\\' && file_name[1] == '\\')
      /* UNC prefixed path \\ (eg \\?\C:\foo) */
      max_sanitized_len = 32767-1;
    else
#endif
      max_sanitized_len = PATH_MAX-1;
  }
  else
    /* The maximum length of a filename.
       FILENAME_MAX is often the same as PATH_MAX, in other words it is 260 and
       does not discount the path information therefore we shouldn't use it. */
    max_sanitized_len = (PATH_MAX-1 > 255) ? 255 : PATH_MAX-1;

  len = strlen(file_name);
  if(len > max_sanitized_len) {
    if(!(flags & SANITIZE_ALLOW_TRUNCATE) ||
       truncate_dryrun(file_name, max_sanitized_len))
      return SANITIZE_ERR_INVALID_PATH;

    len = max_sanitized_len;
  }

  target = malloc(len + 1);
  if(!target)
    return SANITIZE_ERR_OUT_OF_MEMORY;

  strncpy(target, file_name, len);
  target[len] = '\0';

#ifndef MSDOS
  if((flags & SANITIZE_ALLOW_PATH) && !strncmp(target, "\\\\?\\", 4))
    /* Skip the literal path prefix \\?\ */
    p = target + 4;
  else
#endif
    p = target;

  /* replace control characters and other banned characters */
  for(; *p; ++p) {
    const char *banned;

    if((1 <= *p && *p <= 31) ||
       (!(flags & (SANITIZE_ALLOW_COLONS|SANITIZE_ALLOW_PATH)) && *p == ':') ||
       (!(flags & SANITIZE_ALLOW_PATH) && (*p == '/' || *p == '\\'))) {
      *p = '_';
      continue;
    }

    for(banned = "|<>\"?*"; *banned; ++banned) {
      if(*p == *banned) {
        *p = '_';
        break;
      }
    }
  }

  /* remove trailing spaces and periods if not allowing paths */
  if(!(flags & SANITIZE_ALLOW_PATH) && len) {
    char *clip = NULL;

    p = &target[len];
    do {
      --p;
      if(*p != ' ' && *p != '.')
        break;
      clip = p;
    } while(p != target);

    if(clip) {
      *clip = '\0';
      len = clip - target;
    }
  }

#ifdef MSDOS
  sc = msdosify(&p, target, flags);
  free(target);
  if(sc)
    return sc;
  target = p;
  len = strlen(target);

  if(len > max_sanitized_len) {
    free(target);
    return SANITIZE_ERR_INVALID_PATH;
  }
#endif

  if(!(flags & SANITIZE_ALLOW_RESERVED)) {
    sc = rename_if_reserved_dos_device_name(&p, target, flags);
    free(target);
    if(sc)
      return sc;
    target = p;
    len = strlen(target);

    if(len > max_sanitized_len) {
      free(target);
      return SANITIZE_ERR_INVALID_PATH;
    }
  }

  *sanitized = target;
  return SANITIZE_ERR_OK;
}


/*
Test if truncating a path to a file will leave at least a single character in
the filename. Filenames suffixed by an alternate data stream can't be
truncated. This performs a dry run, nothing is modified.

Good truncate_pos 9:    C:\foo\bar  =>  C:\foo\ba
Good truncate_pos 6:    C:\foo      =>  C:\foo
Good truncate_pos 5:    C:\foo      =>  C:\fo
Bad* truncate_pos 5:    C:foo       =>  C:foo
Bad truncate_pos 5:     C:\foo:ads  =>  C:\fo
Bad truncate_pos 9:     C:\foo:ads  =>  C:\foo:ad
Bad truncate_pos 5:     C:\foo\bar  =>  C:\fo
Bad truncate_pos 5:     C:\foo\     =>  C:\fo
Bad truncate_pos 7:     C:\foo\     =>  C:\foo\
Error truncate_pos 7:   C:\foo      =>  (pos out of range)
Bad truncate_pos 1:     C:\foo\     =>  C

* C:foo is ambiguous, C could end up being a drive or file therefore something
  like C:superlongfilename can't be truncated.

Returns
SANITIZE_ERR_OK: Good -- 'path' can be truncated
SANITIZE_ERR_INVALID_PATH: Bad -- 'path' cannot be truncated
!= SANITIZE_ERR_OK && != SANITIZE_ERR_INVALID_PATH: Error
*/
SANITIZEcode truncate_dryrun(const char *path, const size_t truncate_pos)
{
  size_t len;

  if(!path)
    return SANITIZE_ERR_BAD_ARGUMENT;

  len = strlen(path);

  if(truncate_pos > len)
    return SANITIZE_ERR_BAD_ARGUMENT;

  if(!len || !truncate_pos)
    return SANITIZE_ERR_INVALID_PATH;

  if(strpbrk(&path[truncate_pos - 1], "\\/:"))
    return SANITIZE_ERR_INVALID_PATH;

  /* C:\foo can be truncated but C:\foo:ads can't */
  if(truncate_pos > 1) {
    const char *p = &path[truncate_pos - 1];
    do {
      --p;
      if(*p == ':')
        return SANITIZE_ERR_INVALID_PATH;
    } while(p != path && *p != '\\' && *p != '/');
  }

  return SANITIZE_ERR_OK;
}

/* The functions msdosify, rename_if_dos_device_name and __crt0_glob_function
 * were taken with modification from the DJGPP port of tar 1.12. They use
 * algorithms originally from DJTAR.
 */

/*
Extra sanitization MSDOS for file_name.

This is a supporting function for sanitize_file_name.

Warning: This is an MSDOS legacy function and was purposely written in a way
that some path information may pass through. For example drive letter names
(C:, D:, etc) are allowed to pass through. For sanitizing a filename use
sanitize_file_name.

Success: (SANITIZE_ERR_OK) *sanitized points to a sanitized copy of file_name.
Failure: (!= SANITIZE_ERR_OK) *sanitized is NULL.
*/
#if defined(MSDOS) || defined(UNITTESTS)
SANITIZEcode msdosify(char **const sanitized, const char *file_name,
                      int flags)
{
  char dos_name[PATH_MAX];
  static const char illegal_chars_dos[] = ".+, ;=[]" /* illegal in DOS */
    "|<>/\\\":?*"; /* illegal in DOS & W95 */
  static const char *illegal_chars_w95 = &illegal_chars_dos[8];
  int idx, dot_idx;
  const char *s = file_name;
  char *d = dos_name;
  const char *const dlimit = dos_name + sizeof(dos_name) - 1;
  const char *illegal_aliens = illegal_chars_dos;
  size_t len = sizeof(illegal_chars_dos) - 1;

  if(!sanitized)
    return SANITIZE_ERR_BAD_ARGUMENT;

  *sanitized = NULL;

  if(!file_name)
    return SANITIZE_ERR_BAD_ARGUMENT;

  if(strlen(file_name) > PATH_MAX-1 &&
     (!(flags & SANITIZE_ALLOW_TRUNCATE) ||
      truncate_dryrun(file_name, PATH_MAX-1)))
    return SANITIZE_ERR_INVALID_PATH;

  /* Support for Windows 9X VFAT systems, when available. */
  if(_use_lfn(file_name)) {
    illegal_aliens = illegal_chars_w95;
    len -= (illegal_chars_w95 - illegal_chars_dos);
  }

  /* Get past the drive letter, if any. */
  if(s[0] >= 'A' && s[0] <= 'z' && s[1] == ':') {
    *d++ = *s++;
    *d = ((flags & (SANITIZE_ALLOW_COLONS|SANITIZE_ALLOW_PATH))) ? ':' : '_';
    ++d, ++s;
  }

  for(idx = 0, dot_idx = -1; *s && d < dlimit; s++, d++) {
    if(memchr(illegal_aliens, *s, len)) {

      if((flags & (SANITIZE_ALLOW_COLONS|SANITIZE_ALLOW_PATH)) && *s == ':')
        *d = ':';
      else if((flags & SANITIZE_ALLOW_PATH) && (*s == '/' || *s == '\\'))
        *d = *s;
      /* Dots are special: DOS doesn't allow them as the leading character,
         and a file name cannot have more than a single dot.  We leave the
         first non-leading dot alone, unless it comes too close to the
         beginning of the name: we want sh.lex.c to become sh_lex.c, not
         sh.lex-c.  */
      else if(*s == '.') {
        if((flags & SANITIZE_ALLOW_PATH) && idx == 0 &&
           (s[1] == '/' || s[1] == '\\' ||
            (s[1] == '.' && (s[2] == '/' || s[2] == '\\')))) {
          /* Copy "./" and "../" verbatim.  */
          *d++ = *s++;
          if(d == dlimit)
            break;
          if(*s == '.') {
            *d++ = *s++;
            if(d == dlimit)
              break;
          }
          *d = *s;
        }
        else if(idx == 0)
          *d = '_';
        else if(dot_idx >= 0) {
          if(dot_idx < 5) { /* 5 is a heuristic ad-hoc'ery */
            d[dot_idx - idx] = '_'; /* replace previous dot */
            *d = '.';
          }
          else
            *d = '-';
        }
        else
          *d = '.';

        if(*s == '.')
          dot_idx = idx;
      }
      else if(*s == '+' && s[1] == '+') {
        if(idx - 2 == dot_idx) { /* .c++, .h++ etc. */
          *d++ = 'x';
          if(d == dlimit)
            break;
          *d   = 'x';
        }
        else {
          /* libg++ etc.  */
          if(dlimit - d < 4) {
            *d++ = 'x';
            if(d == dlimit)
              break;
            *d   = 'x';
          }
          else {
            memcpy(d, "plus", 4);
            d += 3;
          }
        }
        s++;
        idx++;
      }
      else
        *d = '_';
    }
    else
      *d = *s;
    if(*s == '/' || *s == '\\') {
      idx = 0;
      dot_idx = -1;
    }
    else
      idx++;
  }
  *d = '\0';

  if(*s) {
    /* dos_name is truncated, check that truncation requirements are met,
       specifically truncating a filename suffixed by an alternate data stream
       or truncating the entire filename is not allowed. */
    if(!(flags & SANITIZE_ALLOW_TRUNCATE) || strpbrk(s, "\\/:") ||
       truncate_dryrun(dos_name, d - dos_name))
      return SANITIZE_ERR_INVALID_PATH;
  }

  *sanitized = strdup(dos_name);
  return (*sanitized ? SANITIZE_ERR_OK : SANITIZE_ERR_OUT_OF_MEMORY);
}
#endif /* MSDOS || UNITTESTS */

/*
Rename file_name if it's a reserved dos device name.

This is a supporting function for sanitize_file_name.

Warning: This is an MSDOS legacy function and was purposely written in a way
that some path information may pass through. For example drive letter names
(C:, D:, etc) are allowed to pass through. For sanitizing a filename use
sanitize_file_name.

Success: (SANITIZE_ERR_OK) *sanitized points to a sanitized copy of file_name.
Failure: (!= SANITIZE_ERR_OK) *sanitized is NULL.
*/
SANITIZEcode rename_if_reserved_dos_device_name(char **const sanitized,
                                                const char *file_name,
                                                int flags)
{
  /* We could have a file whose name is a device on MS-DOS.  Trying to
   * retrieve such a file would fail at best and wedge us at worst.  We need
   * to rename such files. */
  char *p, *base;
  char fname[PATH_MAX];
#ifdef MSDOS
  struct_stat st_buf;
#endif

  if(!sanitized)
    return SANITIZE_ERR_BAD_ARGUMENT;

  *sanitized = NULL;

  if(!file_name)
    return SANITIZE_ERR_BAD_ARGUMENT;

  /* Ignore UNC prefixed paths, they are allowed to contain a reserved name. */
#ifndef MSDOS
  if((flags & SANITIZE_ALLOW_PATH) &&
     file_name[0] == '\\' && file_name[1] == '\\') {
    size_t len = strlen(file_name);
    *sanitized = malloc(len + 1);
    if(!*sanitized)
      return SANITIZE_ERR_OUT_OF_MEMORY;
    strncpy(*sanitized, file_name, len + 1);
    return SANITIZE_ERR_OK;
  }
#endif

  if(strlen(file_name) > PATH_MAX-1 &&
     (!(flags & SANITIZE_ALLOW_TRUNCATE) ||
      truncate_dryrun(file_name, PATH_MAX-1)))
    return SANITIZE_ERR_INVALID_PATH;

  strncpy(fname, file_name, PATH_MAX-1);
  fname[PATH_MAX-1] = '\0';
  base = basename(fname);

  /* Rename reserved device names that are known to be accessible without \\.\
     Examples: CON => _CON, CON.EXT => CON_EXT, CON:ADS => CON_ADS
     https://support.microsoft.com/en-us/kb/74496
     https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247.aspx
     */
  for(p = fname; p; p = (p == fname && fname != base ? base : NULL)) {
    size_t p_len;
    int x = (curl_strnequal(p, "CON", 3) ||
             curl_strnequal(p, "PRN", 3) ||
             curl_strnequal(p, "AUX", 3) ||
             curl_strnequal(p, "NUL", 3)) ? 3 :
            (curl_strnequal(p, "CLOCK$", 6)) ? 6 :
            (curl_strnequal(p, "COM", 3) || curl_strnequal(p, "LPT", 3)) ?
              (('1' <= p[3] && p[3] <= '9') ? 4 : 3) : 0;

    if(!x)
      continue;

    /* the devices may be accessible with an extension or ADS, for
       example CON.AIR and 'CON . AIR' and CON:AIR access console */

    for(; p[x] == ' '; ++x)
      ;

    if(p[x] == '.') {
      p[x] = '_';
      continue;
    }
    else if(p[x] == ':') {
      if(!(flags & (SANITIZE_ALLOW_COLONS|SANITIZE_ALLOW_PATH))) {
        p[x] = '_';
        continue;
      }
      ++x;
    }
    else if(p[x]) /* no match */
      continue;

    /* p points to 'CON' or 'CON ' or 'CON:', etc */
    p_len = strlen(p);

    /* Prepend a '_' */
    if(strlen(fname) == PATH_MAX-1) {
      --p_len;
      if(!(flags & SANITIZE_ALLOW_TRUNCATE) || truncate_dryrun(p, p_len))
        return SANITIZE_ERR_INVALID_PATH;
      p[p_len] = '\0';
    }
    memmove(p + 1, p, p_len + 1);
    p[0] = '_';
    ++p_len;

    /* if fname was just modified then the basename pointer must be updated */
    if(p == fname)
      base = basename(fname);
  }

  /* This is the legacy portion from rename_if_dos_device_name that checks for
     reserved device names. It only works on MSDOS. On Windows XP the stat
     check errors with EINVAL if the device name is reserved. On Windows
     Vista/7/8 it sets mode S_IFREG (regular file or device). According to MSDN
     stat doc the latter behavior is correct, but that doesn't help us identify
     whether it's a reserved device name and not a regular file name. */
#ifdef MSDOS
  if(base && ((stat(base, &st_buf)) == 0) && (S_ISCHR(st_buf.st_mode))) {
    /* Prepend a '_' */
    size_t blen = strlen(base);
    if(blen) {
      if(strlen(fname) == PATH_MAX-1) {
        --blen;
        if(!(flags & SANITIZE_ALLOW_TRUNCATE) || truncate_dryrun(base, blen))
          return SANITIZE_ERR_INVALID_PATH;
        base[blen] = '\0';
      }
      memmove(base + 1, base, blen + 1);
      base[0] = '_';
    }
  }
#endif

  *sanitized = strdup(fname);
  return (*sanitized ? SANITIZE_ERR_OK : SANITIZE_ERR_OUT_OF_MEMORY);
}

#if defined(MSDOS) && (defined(__DJGPP__) || defined(__GO32__))

/*
 * Disable program default argument globbing. We do it on our own.
 */
char **__crt0_glob_function(char *arg)
{
  (void)arg;
  return (char **)0;
}

#endif /* MSDOS && (__DJGPP__ || __GO32__) */

#ifdef WIN32

/*
 * Function to find CACert bundle on a Win32 platform using SearchPath.
 * (SearchPath is already declared via inclusions done in setup header file)
 * (Use the ASCII version instead of the unicode one!)
 * The order of the directories it searches is:
 *  1. application's directory
 *  2. current working directory
 *  3. Windows System directory (e.g. C:\windows\system32)
 *  4. Windows Directory (e.g. C:\windows)
 *  5. all directories along %PATH%
 *
 * For WinXP and later search order actually depends on registry value:
 * HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\SafeProcessSearchMode
 */

CURLcode FindWin32CACert(struct OperationConfig *config,
                         curl_sslbackend backend,
                         const char *bundle_file)
{
  CURLcode result = CURLE_OK;

  /* Search and set cert file only if libcurl supports SSL.
   *
   * If Schannel is the selected SSL backend then these locations are
   * ignored. We allow setting CA location for schannel only when explicitly
   * specified by the user via CURLOPT_CAINFO / --cacert.
   */
  if((curlinfo->features & CURL_VERSION_SSL) &&
     backend != CURLSSLBACKEND_SCHANNEL) {

    DWORD res_len;
    char buf[PATH_MAX];
    char *ptr = NULL;

    buf[0] = '\0';

    res_len = SearchPathA(NULL, bundle_file, NULL, PATH_MAX, buf, &ptr);
    if(res_len > 0) {
      Curl_safefree(config->cacert);
      config->cacert = strdup(buf);
      if(!config->cacert)
        result = CURLE_OUT_OF_MEMORY;
    }
  }

  return result;
}


/* Get a list of all loaded modules with full paths.
 * Returns slist on success or NULL on error.
 */
struct curl_slist *GetLoadedModulePaths(void)
{
  HANDLE hnd = INVALID_HANDLE_VALUE;
  MODULEENTRY32 mod = {0};
  struct curl_slist *slist = NULL;

  mod.dwSize = sizeof(MODULEENTRY32);

  do {
    hnd = CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, 0);
  } while(hnd == INVALID_HANDLE_VALUE && GetLastError() == ERROR_BAD_LENGTH);

  if(hnd == INVALID_HANDLE_VALUE)
    goto error;

  if(!Module32First(hnd, &mod))
    goto error;

  do {
    char *path; /* points to stack allocated buffer */
    struct curl_slist *temp;

#ifdef UNICODE
    /* sizeof(mod.szExePath) is the max total bytes of wchars. the max total
       bytes of multibyte chars won't be more than twice that. */
    char buffer[sizeof(mod.szExePath) * 2];
    if(!WideCharToMultiByte(CP_ACP, 0, mod.szExePath, -1,
                            buffer, sizeof(buffer), NULL, NULL))
      goto error;
    path = buffer;
#else
    path = mod.szExePath;
#endif
    temp = curl_slist_append(slist, path);
    if(!temp)
      goto error;
    slist = temp;
  } while(Module32Next(hnd, &mod));

  goto cleanup;

error:
  curl_slist_free_all(slist);
  slist = NULL;
cleanup:
  if(hnd != INVALID_HANDLE_VALUE)
    CloseHandle(hnd);
  return slist;
}

#endif /* WIN32 */

#endif /* MSDOS || WIN32 */