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Commit | Line | Data |
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025c1fac | 1 | /* path.cc: path support. |
1fd5e000 | 2 | |
81adfe28 | 3 | This file is part of Cygwin. |
1fd5e000 | 4 | |
81adfe28 CF |
5 | This software is a copyrighted work licensed under the terms of the |
6 | Cygwin license. Please consult the file "CYGWIN_LICENSE" for | |
7 | details. */ | |
1fd5e000 | 8 | |
81adfe28 CF |
9 | /* This module's job is to |
10 | - convert between POSIX and Win32 style filenames, | |
11 | - support the `mount' functionality, | |
12 | - support symlinks for files and directories | |
1fd5e000 | 13 | |
81adfe28 | 14 | Pathnames are handled as follows: |
1fd5e000 | 15 | |
81adfe28 CF |
16 | - A \ or : in a path denotes a pure windows spec. |
17 | - Paths beginning with // (or \\) are not translated (i.e. looked | |
18 | up in the mount table) and are assumed to be UNC path names. | |
1fd5e000 | 19 | |
81adfe28 CF |
20 | The goal in the above set of rules is to allow both POSIX and Win32 |
21 | flavors of pathnames without either interfering. The rules are | |
22 | intended to be as close to a superset of both as possible. | |
1fd5e000 | 23 | |
81adfe28 CF |
24 | Note that you can have more than one path to a file. The mount |
25 | table is always prefered when translating Win32 paths to POSIX | |
26 | paths. Win32 paths in mount table entries may be UNC paths or | |
27 | standard Win32 paths starting with <drive-letter>: | |
1fd5e000 | 28 | |
81adfe28 CF |
29 | Text vs Binary issues are not considered here in path style |
30 | decisions, although the appropriate flags are retrieved and | |
31 | stored in various structures. | |
1fd5e000 | 32 | |
81adfe28 CF |
33 | Removing mounted filesystem support would simplify things greatly, |
34 | but having it gives us a mechanism of treating disk that lives on a | |
35 | UNIX machine as having UNIX semantics [it allows one to edit a text | |
36 | file on that disk and not have cr's magically appear and perhaps | |
37 | break apps running on UNIX boxes]. It also useful to be able to | |
38 | layout a hierarchy without changing the underlying directories. | |
1fd5e000 | 39 | |
81adfe28 CF |
40 | The semantics of mounting file systems is not intended to precisely |
41 | follow normal UNIX systems. | |
1fd5e000 | 42 | |
81adfe28 CF |
43 | Each DOS drive is defined to have a current directory. Supporting |
44 | this would complicate things so for now things are defined so that | |
45 | c: means c:\. | |
46 | */ | |
1fd5e000 | 47 | |
c9b37162 YS |
48 | /* This file includes both the XPG and GNU basename functions, with the |
49 | former exported as "basename" for ABI compatibility but the latter | |
50 | declared as such for source compatibility with glibc. This tells | |
51 | <string.h> not to declare the GNU variant in order to prevent a conflicting | |
52 | declaration error with the XPG variant implemented herein. */ | |
53 | #define basename basename | |
4c8d72de | 54 | #include "winsup.h" |
28cf818c CV |
55 | #include <w32api/winioctl.h> |
56 | #include <w32api/shlobj.h> | |
75543537 | 57 | #include <sys/param.h> |
f0338f54 | 58 | #include <sys/cygwin.h> |
28cf818c | 59 | #include <wctype.h> |
7d00a5e3 | 60 | #include <assert.h> |
9e2baf8d | 61 | #include "cygerrno.h" |
bccd5e0d | 62 | #include "path.h" |
7ac61736 | 63 | #include "fhandler.h" |
0381fec6 | 64 | #include "dtable.h" |
b0e82b74 | 65 | #include "cygheap.h" |
29ac7f89 | 66 | #include "shared_info.h" |
752b16ce | 67 | #include "tls_pbuf.h" |
6f1d4862 | 68 | #include "environ.h" |
c9b37162 | 69 | #undef basename |
1fd5e000 | 70 | |
66a83f3e CF |
71 | suffix_info stat_suffixes[] = |
72 | { | |
73 | suffix_info ("", 1), | |
74 | suffix_info (".exe", 1), | |
75 | suffix_info (NULL) | |
76 | }; | |
77 | ||
1870c688 CV |
78 | struct symlink_info |
79 | { | |
80 | char contents[SYMLINK_MAX + 1]; | |
81 | char *ext_here; | |
82 | int extn; | |
c1023ee3 CV |
83 | unsigned path_flags; |
84 | unsigned mount_flags; | |
85 | unsigned pc_flags; /* Relevant pathconv_arg flags from path_conv caller */ | |
1870c688 CV |
86 | DWORD fileattr; |
87 | int issymlink; | |
88 | bool ext_tacked_on; | |
89 | int error; | |
1870c688 CV |
90 | bool isdevice; |
91 | _major_t major; | |
92 | _minor_t minor; | |
ea58e20c | 93 | __mode_t mode; |
5a0d1edb CV |
94 | int check (char *path, const suffix_info *suffixes, fs_info &fs, |
95 | path_conv_handle &conv_hdl); | |
1870c688 CV |
96 | int set (char *path); |
97 | bool parse_device (const char *); | |
1870c688 CV |
98 | int check_sysfile (HANDLE h); |
99 | int check_shortcut (HANDLE h); | |
855ea3fd | 100 | int check_reparse_point (HANDLE h, bool remote); |
1870c688 CV |
101 | int check_nfs_symlink (HANDLE h); |
102 | int posixify (char *srcbuf); | |
103 | bool set_error (int); | |
104 | }; | |
105 | ||
106 | muto NO_COPY cwdstuff::cwd_lock; | |
107 | ||
1870c688 | 108 | static const GUID GUID_shortcut |
7b9e380f | 109 | = { 0x00021401L, 0, 0, {0xc0, 0, 0, 0, 0, 0, 0, 0x46}}; |
1870c688 | 110 | |
c4441d46 CF |
111 | enum |
112 | { | |
1870c688 CV |
113 | WSH_FLAG_IDLIST = 0x01, /* Contains an ITEMIDLIST. */ |
114 | WSH_FLAG_FILE = 0x02, /* Contains a file locator element. */ | |
115 | WSH_FLAG_DESC = 0x04, /* Contains a description. */ | |
116 | WSH_FLAG_RELPATH = 0x08, /* Contains a relative path. */ | |
117 | WSH_FLAG_WD = 0x10, /* Contains a working dir. */ | |
118 | WSH_FLAG_CMDLINE = 0x20, /* Contains command line args. */ | |
119 | WSH_FLAG_ICON = 0x40 /* Contains a custom icon. */ | |
120 | }; | |
121 | ||
122 | struct win_shortcut_hdr | |
c4441d46 CF |
123 | { |
124 | DWORD size; /* Header size in bytes. Must contain 0x4c. */ | |
125 | GUID magic; /* GUID of shortcut files. */ | |
126 | DWORD flags; /* Content flags. See above. */ | |
127 | ||
128 | /* The next fields from attr to icon_no are always set to 0 in Cygwin | |
129 | and U/Win shortcuts. */ | |
130 | DWORD attr; /* Target file attributes. */ | |
131 | FILETIME ctime; /* These filetime items are never touched by the */ | |
132 | FILETIME mtime; /* system, apparently. Values don't matter. */ | |
133 | FILETIME atime; | |
134 | DWORD filesize; /* Target filesize. */ | |
135 | DWORD icon_no; /* Icon number. */ | |
136 | ||
137 | DWORD run; /* Values defined in winuser.h. Use SW_NORMAL. */ | |
138 | DWORD hotkey; /* Hotkey value. Set to 0. */ | |
139 | DWORD dummy[2]; /* Future extension probably. Always 0. */ | |
140 | }; | |
81adfe28 | 141 | |
1870c688 CV |
142 | /* Return non-zero if PATH1 is a prefix of PATH2. |
143 | Both are assumed to be of the same path style and / vs \ usage. | |
144 | Neither may be "". | |
145 | LEN1 = strlen (PATH1). It's passed because often it's already known. | |
146 | ||
147 | Examples: | |
148 | /foo/ is a prefix of /foo <-- may seem odd, but desired | |
149 | /foo is a prefix of /foo/ | |
150 | / is a prefix of /foo/bar | |
151 | / is not a prefix of foo/bar | |
152 | foo/ is a prefix foo/bar | |
153 | /foo is not a prefix of /foobar | |
154 | */ | |
155 | ||
156 | int | |
e4b57503 CV |
157 | path_prefix_p (const char *path1, const char *path2, int len1, |
158 | bool caseinsensitive) | |
1870c688 CV |
159 | { |
160 | /* Handle case where PATH1 has trailing '/' and when it doesn't. */ | |
161 | if (len1 > 0 && isdirsep (path1[len1 - 1])) | |
162 | len1--; | |
163 | ||
164 | if (len1 == 0) | |
165 | return isdirsep (path2[0]) && !isdirsep (path2[1]); | |
166 | ||
167 | if (isdirsep (path2[len1]) || path2[len1] == 0 || path1[len1 - 1] == ':') | |
54a83cc6 CV |
168 | return caseinsensitive ? strncasematch (path1, path2, len1) |
169 | : !strncmp (path1, path2, len1); | |
1870c688 CV |
170 | |
171 | return 0; | |
172 | } | |
173 | ||
174 | /* Return non-zero if paths match in first len chars. | |
175 | Check is dependent of the case sensitivity setting. */ | |
176 | int | |
e4b57503 | 177 | pathnmatch (const char *path1, const char *path2, int len, bool caseinsensitive) |
1870c688 | 178 | { |
e4b57503 CV |
179 | return caseinsensitive |
180 | ? strncasematch (path1, path2, len) : !strncmp (path1, path2, len); | |
1870c688 CV |
181 | } |
182 | ||
183 | /* Return non-zero if paths match. Check is dependent of the case | |
184 | sensitivity setting. */ | |
185 | int | |
e4b57503 | 186 | pathmatch (const char *path1, const char *path2, bool caseinsensitive) |
1870c688 | 187 | { |
e4b57503 CV |
188 | return caseinsensitive |
189 | ? strcasematch (path1, path2) : !strcmp (path1, path2); | |
1870c688 CV |
190 | } |
191 | ||
192 | /* TODO: This function is used in mkdir and rmdir to generate correct | |
193 | error messages in case of paths ending in /. or /.. components. | |
194 | Right now, normalize_posix_path will just normalize | |
195 | those components away, which changes the semantics. */ | |
196 | bool | |
197 | has_dot_last_component (const char *dir, bool test_dot_dot) | |
198 | { | |
199 | /* SUSv3: . and .. are not allowed as last components in various system | |
200 | calls. Don't test for backslash path separator since that's a Win32 | |
201 | path following Win32 rules. */ | |
284c5ea0 CF |
202 | const char *last_comp = strchr (dir, '\0'); |
203 | ||
204 | if (last_comp == dir) | |
205 | return false; /* Empty string. Probably shouldn't happen here? */ | |
206 | ||
207 | /* Detect run of trailing slashes */ | |
208 | while (last_comp > dir && *--last_comp == '/') | |
209 | continue; | |
210 | ||
211 | /* Detect just a run of slashes or a path that does not end with a slash. */ | |
212 | if (*last_comp != '.') | |
213 | return false; | |
214 | ||
215 | /* We know we have a trailing dot here. Check that it really is a standalone "." | |
216 | path component by checking that it is at the beginning of the string or is | |
217 | preceded by a "/" */ | |
218 | if (last_comp == dir || *--last_comp == '/') | |
219 | return true; | |
220 | ||
221 | /* If we're not checking for '..' we're done. Ditto if we're now pointing to | |
222 | a non-dot. */ | |
223 | if (!test_dot_dot || *last_comp != '.') | |
224 | return false; /* either not testing for .. or this was not '..' */ | |
225 | ||
226 | /* Repeat previous test for standalone or path component. */ | |
227 | return last_comp == dir || last_comp[-1] == '/'; | |
1870c688 CV |
228 | } |
229 | ||
230 | /* Normalize a POSIX path. | |
231 | All duplicate /'s, except for 2 leading /'s, are deleted. | |
232 | The result is 0 for success, or an errno error value. */ | |
233 | ||
234 | int | |
235 | normalize_posix_path (const char *src, char *dst, char *&tail) | |
236 | { | |
237 | const char *in_src = src; | |
238 | char *dst_start = dst; | |
0b8722c2 | 239 | bool check_parent = false; |
1870c688 CV |
240 | syscall_printf ("src %s", src); |
241 | ||
242 | if ((isdrive (src) && isdirsep (src[2])) || *src == '\\') | |
243 | goto win32_path; | |
244 | ||
245 | tail = dst; | |
246 | if (!isslash (src[0])) | |
247 | { | |
248 | if (!cygheap->cwd.get (dst)) | |
249 | return get_errno (); | |
250 | tail = strchr (tail, '\0'); | |
251 | if (isslash (dst[0]) && isslash (dst[1])) | |
252 | ++dst_start; | |
253 | if (*src == '.') | |
254 | { | |
255 | if (tail == dst_start + 1 && *dst_start == '/') | |
256 | tail--; | |
257 | goto sawdot; | |
258 | } | |
259 | if (tail > dst && !isslash (tail[-1])) | |
260 | *tail++ = '/'; | |
261 | } | |
262 | /* Two leading /'s? If so, preserve them. */ | |
263 | else if (isslash (src[1]) && !isslash (src[2])) | |
264 | { | |
265 | *tail++ = *src++; | |
266 | ++dst_start; | |
267 | } | |
b98ebf54 | 268 | |
1870c688 CV |
269 | while (*src) |
270 | { | |
271 | if (*src == '\\') | |
272 | goto win32_path; | |
273 | /* Strip runs of /'s. */ | |
274 | if (!isslash (*src)) | |
275 | *tail++ = *src++; | |
276 | else | |
277 | { | |
0b8722c2 | 278 | check_parent = true; |
1870c688 CV |
279 | while (*++src) |
280 | { | |
281 | if (isslash (*src)) | |
282 | continue; | |
81adfe28 | 283 | |
1870c688 CV |
284 | if (*src != '.') |
285 | break; | |
81adfe28 | 286 | |
1870c688 CV |
287 | sawdot: |
288 | if (src[1] != '.') | |
289 | { | |
290 | if (!src[1]) | |
291 | { | |
292 | *tail++ = '/'; | |
293 | goto done; | |
294 | } | |
295 | if (!isslash (src[1])) | |
296 | break; | |
297 | } | |
298 | else if (src[2] && !isslash (src[2])) | |
299 | break; | |
300 | else | |
301 | { | |
0b8722c2 CV |
302 | /* According to POSIX semantics all elements of path must |
303 | exist. To follow it, we must validate our path before | |
304 | removing the trailing component. Check_parent is needed | |
305 | for performance optimization, in order not to verify paths | |
306 | which are already verified. For example this prevents | |
307 | double check in case of foo/bar/../.. */ | |
308 | if (check_parent) | |
309 | { | |
fd5f6eb1 | 310 | if (tail > dst_start) /* Don't check for / or // dir. */ |
d2ef2331 | 311 | { |
fd5f6eb1 CV |
312 | *tail = 0; |
313 | debug_printf ("checking %s before '..'", dst); | |
7ae3e6b3 CV |
314 | /* In conjunction with native and NFS symlinks, |
315 | this call can result in a recursion which eats | |
316 | up our tmp_pathbuf buffers. This in turn results | |
317 | in a api_fatal call. To avoid that, we're | |
318 | checking our remaining buffers and return an | |
319 | error code instead. Note that this only happens | |
320 | if the path contains 15 or more relative native/NFS | |
321 | symlinks with a ".." in the target path. */ | |
322 | tmp_pathbuf tp; | |
323 | if (!tp.check_usage (4, 3)) | |
324 | return ELOOP; | |
325 | path_conv head (dst, PC_SYM_FOLLOW | PC_POSIX); | |
fd5f6eb1 CV |
326 | if (!head.isdir()) |
327 | return ENOENT; | |
7ae3e6b3 CV |
328 | /* At this point, dst is a normalized path. If the |
329 | normalized path created by path_conv does not | |
330 | match the normalized path we're just testing, then | |
331 | the path in dst contains native symlinks. If we | |
332 | just plunge along, removing the previous path | |
333 | component, we may end up removing a symlink from | |
334 | the path and the resulting path will be invalid. | |
335 | So we replace dst with what we found in head | |
336 | instead. All the work replacing symlinks has been | |
337 | done in that path anyway, so why repeat it? */ | |
d2bd82aa | 338 | tail = stpcpy (dst, head.get_posix ()); |
fd5f6eb1 | 339 | } |
0b8722c2 CV |
340 | check_parent = false; |
341 | } | |
1870c688 CV |
342 | while (tail > dst_start && !isslash (*--tail)) |
343 | continue; | |
344 | src++; | |
345 | } | |
346 | } | |
81adfe28 | 347 | |
b861c0a3 | 348 | *tail++ = '/'; |
1870c688 CV |
349 | } |
350 | if ((tail - dst) >= NT_MAX_PATH) | |
b98ebf54 | 351 | { |
1870c688 CV |
352 | debug_printf ("ENAMETOOLONG = normalize_posix_path (%s)", src); |
353 | return ENAMETOOLONG; | |
b98ebf54 | 354 | } |
1870c688 | 355 | } |
81adfe28 | 356 | |
1870c688 CV |
357 | done: |
358 | *tail = '\0'; | |
81adfe28 | 359 | |
1870c688 CV |
360 | debug_printf ("%s = normalize_posix_path (%s)", dst, in_src); |
361 | return 0; | |
81adfe28 | 362 | |
1870c688 CV |
363 | win32_path: |
364 | int err = normalize_win32_path (in_src, dst, tail); | |
365 | if (!err) | |
366 | for (char *p = dst; (p = strchr (p, '\\')); p++) | |
367 | *p = '/'; | |
368 | return err ?: -1; | |
369 | } | |
81adfe28 | 370 | |
1870c688 CV |
371 | inline void |
372 | path_conv::add_ext_from_sym (symlink_info &sym) | |
373 | { | |
374 | if (sym.ext_here && *sym.ext_here) | |
375 | { | |
d2bd82aa | 376 | suffix = path + sym.extn; |
1870c688 | 377 | if (sym.ext_tacked_on) |
d2bd82aa | 378 | strcpy ((char *) suffix, sym.ext_here); |
1870c688 CV |
379 | } |
380 | } | |
381 | ||
6e75c72b | 382 | static void __reg2 mkrelpath (char *dst, bool caseinsensitive); |
fafbf755 | 383 | |
1f36328e | 384 | static void __reg2 |
e4b57503 | 385 | mkrelpath (char *path, bool caseinsensitive) |
1870c688 CV |
386 | { |
387 | tmp_pathbuf tp; | |
388 | char *cwd_win32 = tp.c_get (); | |
389 | if (!cygheap->cwd.get (cwd_win32, 0)) | |
390 | return; | |
391 | ||
392 | unsigned cwdlen = strlen (cwd_win32); | |
e4b57503 | 393 | if (!path_prefix_p (cwd_win32, path, cwdlen, caseinsensitive)) |
1870c688 CV |
394 | return; |
395 | ||
396 | size_t n = strlen (path); | |
397 | if (n < cwdlen) | |
398 | return; | |
399 | ||
400 | char *tail = path; | |
401 | if (n == cwdlen) | |
402 | tail += cwdlen; | |
403 | else | |
404 | tail += isdirsep (cwd_win32[cwdlen - 1]) ? cwdlen : cwdlen + 1; | |
405 | ||
406 | memmove (path, tail, strlen (tail) + 1); | |
407 | if (!*path) | |
408 | strcpy (path, "."); | |
409 | } | |
410 | ||
1870c688 | 411 | void |
d2bd82aa | 412 | path_conv::set_posix (const char *path_copy) |
1870c688 | 413 | { |
0986989f | 414 | if (path_copy) |
1870c688 | 415 | { |
0986989f | 416 | size_t n = strlen (path_copy) + 1; |
d2bd82aa CV |
417 | char *p = (char *) crealloc_abort ((void *) posix_path, n); |
418 | posix_path = (const char *) memcpy (p, path_copy, n); | |
1870c688 | 419 | } |
1870c688 CV |
420 | } |
421 | ||
a22af4a9 CV |
422 | static inline void |
423 | str2uni_cat (UNICODE_STRING &tgt, const char *srcstr) | |
424 | { | |
425 | int len = sys_mbstowcs (tgt.Buffer + tgt.Length / sizeof (WCHAR), | |
426 | (tgt.MaximumLength - tgt.Length) / sizeof (WCHAR), | |
427 | srcstr); | |
428 | if (len) | |
429 | tgt.Length += (len - 1) * sizeof (WCHAR); | |
430 | } | |
431 | ||
1870c688 | 432 | PUNICODE_STRING |
8802178f | 433 | get_nt_native_path (const char *path, UNICODE_STRING& upath, bool dos) |
1870c688 CV |
434 | { |
435 | upath.Length = 0; | |
436 | if (path[0] == '/') /* special path w/o NT path representation. */ | |
437 | str2uni_cat (upath, path); | |
24790b9c | 438 | else if (path[0] != '\\') /* X:\... or relative path. */ |
1870c688 | 439 | { |
24790b9c | 440 | if (path[1] == ':') /* X:\... */ |
e4b57503 | 441 | { |
8deb4118 | 442 | RtlAppendUnicodeStringToString (&upath, &ro_u_natp); |
e4b57503 CV |
443 | str2uni_cat (upath, path); |
444 | /* The drive letter must be upper case. */ | |
445 | upath.Buffer[4] = towupper (upath.Buffer[4]); | |
fe9e3b44 CV |
446 | transform_chars (&upath, 7); |
447 | } | |
448 | else /* relative path */ | |
449 | { | |
450 | str2uni_cat (upath, path); | |
451 | transform_chars (&upath, 0); | |
e4b57503 | 452 | } |
1870c688 CV |
453 | } |
454 | else if (path[1] != '\\') /* \Device\... */ | |
455 | str2uni_cat (upath, path); | |
456 | else if ((path[2] != '.' && path[2] != '?') | |
457 | || path[3] != '\\') /* \\server\share\... */ | |
458 | { | |
8deb4118 | 459 | RtlAppendUnicodeStringToString (&upath, &ro_u_uncp); |
1870c688 | 460 | str2uni_cat (upath, path + 2); |
e4b57503 | 461 | transform_chars (&upath, 8); |
1870c688 CV |
462 | } |
463 | else /* \\.\device or \\?\foo */ | |
464 | { | |
8deb4118 | 465 | RtlAppendUnicodeStringToString (&upath, &ro_u_natp); |
1870c688 CV |
466 | str2uni_cat (upath, path + 4); |
467 | } | |
8802178f CV |
468 | if (dos) |
469 | { | |
470 | /* Unfortunately we can't just use transform_chars with the tfx_rev_chars | |
f4529884 | 471 | table since only leading and trailing spaces and dots are affected. |
8802178f CV |
472 | So we step to every backslash and fix surrounding dots and spaces. |
473 | That makes these broken filesystems a bit slower, but, hey. */ | |
474 | PWCHAR cp = upath.Buffer + 7; | |
475 | PWCHAR cend = upath.Buffer + upath.Length / sizeof (WCHAR); | |
476 | while (++cp < cend) | |
477 | if (*cp == L'\\') | |
478 | { | |
479 | PWCHAR ccp = cp - 1; | |
480 | while (*ccp == L'.' || *ccp == L' ') | |
481 | *ccp-- |= 0xf000; | |
482 | while (cp[1] == L' ') | |
483 | *++cp |= 0xf000; | |
484 | } | |
485 | while (*--cp == L'.' || *cp == L' ') | |
b86f999a | 486 | *cp |= 0xf000; |
8802178f | 487 | } |
1870c688 CV |
488 | return &upath; |
489 | } | |
43b2d5ba | 490 | |
5abb0ed1 CV |
491 | /* Handle with extrem care! Only used in a certain instance in try_to_bin. |
492 | Every other usage needs a careful check. */ | |
493 | void | |
494 | path_conv::set_nt_native_path (PUNICODE_STRING new_path) | |
495 | { | |
496 | wide_path = (PWCHAR) crealloc_abort (wide_path, new_path->MaximumLength); | |
497 | memcpy (wide_path, new_path->Buffer, new_path->Length); | |
498 | uni_path.Length = new_path->Length; | |
499 | uni_path.MaximumLength = new_path->MaximumLength; | |
500 | uni_path.Buffer = wide_path; | |
501 | } | |
502 | ||
1870c688 CV |
503 | PUNICODE_STRING |
504 | path_conv::get_nt_native_path () | |
505 | { | |
1f012519 CF |
506 | PUNICODE_STRING res; |
507 | if (wide_path) | |
508 | res = &uni_path; | |
509 | else if (!path) | |
510 | res = NULL; | |
511 | else | |
1870c688 CV |
512 | { |
513 | uni_path.Length = 0; | |
514 | uni_path.MaximumLength = (strlen (path) + 10) * sizeof (WCHAR); | |
515 | wide_path = (PWCHAR) cmalloc_abort (HEAP_STR, uni_path.MaximumLength); | |
516 | uni_path.Buffer = wide_path; | |
5b4c992b | 517 | ::get_nt_native_path (path, uni_path, has_dos_filenames_only ()); |
1f012519 | 518 | res = &uni_path; |
1870c688 | 519 | } |
1f012519 | 520 | return res; |
1870c688 | 521 | } |
91d2f6ee | 522 | |
1870c688 CV |
523 | PWCHAR |
524 | path_conv::get_wide_win32_path (PWCHAR wc) | |
525 | { | |
526 | get_nt_native_path (); | |
ca027229 | 527 | if (!wide_path) |
1870c688 | 528 | return NULL; |
ca027229 CV |
529 | wcpcpy (wc, wide_path); |
530 | if (wc[1] == L'?') | |
531 | wc[1] = L'\\'; | |
1870c688 CV |
532 | return wc; |
533 | } | |
534 | ||
1870c688 | 535 | static DWORD |
e4b57503 | 536 | getfileattr (const char *path, bool caseinsensitive) /* path has to be always absolute. */ |
1870c688 CV |
537 | { |
538 | tmp_pathbuf tp; | |
539 | UNICODE_STRING upath; | |
540 | OBJECT_ATTRIBUTES attr; | |
541 | FILE_BASIC_INFORMATION fbi; | |
542 | NTSTATUS status; | |
543 | IO_STATUS_BLOCK io; | |
544 | ||
545 | tp.u_get (&upath); | |
e4b57503 CV |
546 | InitializeObjectAttributes (&attr, &upath, |
547 | caseinsensitive ? OBJ_CASE_INSENSITIVE : 0, | |
548 | NULL, NULL); | |
8802178f | 549 | get_nt_native_path (path, upath, false); |
1870c688 CV |
550 | |
551 | status = NtQueryAttributesFile (&attr, &fbi); | |
552 | if (NT_SUCCESS (status)) | |
553 | return fbi.FileAttributes; | |
554 | ||
555 | if (status != STATUS_OBJECT_NAME_NOT_FOUND | |
556 | && status != STATUS_NO_SUCH_FILE) /* File not found on 9x share */ | |
557 | { | |
558 | /* File exists but access denied. Try to get attribute through | |
559 | directory query. */ | |
560 | UNICODE_STRING dirname, basename; | |
561 | HANDLE dir; | |
61522196 | 562 | FILE_BOTH_DIR_INFORMATION fdi; |
1870c688 CV |
563 | |
564 | RtlSplitUnicodePath (&upath, &dirname, &basename); | |
565 | InitializeObjectAttributes (&attr, &dirname, | |
e4b57503 CV |
566 | caseinsensitive ? OBJ_CASE_INSENSITIVE : 0, |
567 | NULL, NULL); | |
1870c688 CV |
568 | status = NtOpenFile (&dir, SYNCHRONIZE | FILE_LIST_DIRECTORY, |
569 | &attr, &io, FILE_SHARE_VALID_FLAGS, | |
570 | FILE_SYNCHRONOUS_IO_NONALERT | |
571 | | FILE_OPEN_FOR_BACKUP_INTENT | |
572 | | FILE_DIRECTORY_FILE); | |
573 | if (NT_SUCCESS (status)) | |
574 | { | |
575 | status = NtQueryDirectoryFile (dir, NULL, NULL, 0, &io, | |
576 | &fdi, sizeof fdi, | |
3432d6f1 | 577 | FileBothDirectoryInformation, |
1870c688 CV |
578 | TRUE, &basename, TRUE); |
579 | NtClose (dir); | |
580 | if (NT_SUCCESS (status) || status == STATUS_BUFFER_OVERFLOW) | |
581 | return fdi.FileAttributes; | |
582 | } | |
583 | } | |
584 | SetLastError (RtlNtStatusToDosError (status)); | |
585 | return INVALID_FILE_ATTRIBUTES; | |
586 | } | |
587 | ||
588 | /* Convert an arbitrary path SRC to a pure Win32 path, suitable for | |
589 | passing to Win32 API routines. | |
590 | ||
591 | If an error occurs, `error' is set to the errno value. | |
592 | Otherwise it is set to 0. | |
593 | ||
594 | follow_mode values: | |
595 | SYMLINK_FOLLOW - convert to PATH symlink points to | |
596 | SYMLINK_NOFOLLOW - convert to PATH of symlink itself | |
597 | SYMLINK_IGNORE - do not check PATH for symlinks | |
598 | SYMLINK_CONTENTS - just return symlink contents | |
599 | */ | |
600 | ||
601 | /* TODO: This implementation is only preliminary. For internal | |
602 | purposes it's necessary to have a path_conv::check function which | |
603 | takes a UNICODE_STRING src path, otherwise we waste a lot of time | |
604 | for converting back and forth. The below implementation does | |
605 | realy nothing but converting to char *, until path_conv handles | |
606 | wide-char paths directly. */ | |
607 | void | |
608 | path_conv::check (const UNICODE_STRING *src, unsigned opt, | |
609 | const suffix_info *suffixes) | |
610 | { | |
611 | tmp_pathbuf tp; | |
612 | char *path = tp.c_get (); | |
613 | ||
614 | user_shared->warned_msdos = true; | |
615 | sys_wcstombs (path, NT_MAX_PATH, src->Buffer, src->Length / sizeof (WCHAR)); | |
616 | path_conv::check (path, opt, suffixes); | |
617 | } | |
618 | ||
619 | void | |
620 | path_conv::check (const char *src, unsigned opt, | |
621 | const suffix_info *suffixes) | |
622 | { | |
623 | /* The tmp_buf array is used when expanding symlinks. It is NT_MAX_PATH * 2 | |
624 | in length so that we can hold the expanded symlink plus a trailer. */ | |
625 | tmp_pathbuf tp; | |
626 | char *path_copy = tp.c_get (); | |
627 | char *pathbuf = tp.c_get (); | |
628 | char *tmp_buf = tp.t_get (); | |
0986989f | 629 | char *THIS_path = tp.c_get (); |
1870c688 CV |
630 | symlink_info sym; |
631 | bool need_directory = 0; | |
0986989f | 632 | bool add_ext = false; |
1870c688 CV |
633 | bool is_relpath; |
634 | char *tail, *path_end; | |
1fd5e000 | 635 | |
1870c688 CV |
636 | #if 0 |
637 | static path_conv last_path_conv; | |
638 | static char last_src[CYG_MAX_PATH]; | |
ad30b4ff | 639 | |
1870c688 CV |
640 | if (*last_src && strcmp (last_src, src) == 0) |
641 | { | |
642 | *this = last_path_conv; | |
ad30b4ff | 643 | return; |
1870c688 CV |
644 | } |
645 | #endif | |
ad30b4ff | 646 | |
3f3bd101 CV |
647 | __try |
648 | { | |
649 | int loop = 0; | |
c1023ee3 | 650 | mount_flags = 0; |
3f3bd101 | 651 | path_flags = 0; |
d2bd82aa | 652 | suffix = NULL; |
3f3bd101 CV |
653 | fileattr = INVALID_FILE_ATTRIBUTES; |
654 | caseinsensitive = OBJ_CASE_INSENSITIVE; | |
655 | if (wide_path) | |
656 | cfree (wide_path); | |
657 | wide_path = NULL; | |
658 | if (path) | |
1870c688 | 659 | { |
3f3bd101 CV |
660 | cfree (modifiable_path ()); |
661 | path = NULL; | |
1870c688 | 662 | } |
3f3bd101 | 663 | close_conv_handle (); |
3f3bd101 | 664 | fs.clear (); |
d2bd82aa | 665 | if (posix_path) |
1870c688 | 666 | { |
d2bd82aa CV |
667 | cfree ((void *) posix_path); |
668 | posix_path = NULL; | |
1870c688 | 669 | } |
3f3bd101 | 670 | int component = 0; // Number of translated components |
1870c688 | 671 | |
3f3bd101 CV |
672 | if (!(opt & PC_NULLEMPTY)) |
673 | error = 0; | |
674 | else if (!*src) | |
675 | { | |
676 | error = ENOENT; | |
677 | return; | |
678 | } | |
1870c688 | 679 | |
3f3bd101 CV |
680 | bool is_msdos = false; |
681 | /* This loop handles symlink expansion. */ | |
682 | for (;;) | |
1870c688 | 683 | { |
3f3bd101 CV |
684 | is_relpath = !isabspath (src); |
685 | error = normalize_posix_path (src, path_copy, tail); | |
686 | if (error > 0) | |
687 | return; | |
688 | if (error < 0) | |
1870c688 | 689 | { |
3f3bd101 CV |
690 | if (component == 0) |
691 | is_msdos = true; | |
692 | error = 0; | |
1870c688 | 693 | } |
3f3bd101 CV |
694 | |
695 | /* Detect if the user was looking for a directory. We have to strip | |
696 | the trailing slash initially while trying to add extensions but | |
697 | take it into account during processing */ | |
698 | if (tail > path_copy + 2 && isslash (tail[-1])) | |
1870c688 | 699 | { |
3f3bd101 CV |
700 | need_directory = 1; |
701 | *--tail = '\0'; | |
1870c688 | 702 | } |
3f3bd101 CV |
703 | path_end = tail; |
704 | ||
705 | /* Scan path_copy from right to left looking either for a symlink | |
706 | or an actual existing file. If an existing file is found, just | |
707 | return. If a symlink is found, exit the for loop. | |
708 | Also: be careful to preserve the errno returned from | |
709 | symlink.check as the caller may need it. */ | |
710 | /* FIXME: Do we have to worry about multiple \'s here? */ | |
711 | component = 0; // Number of translated components | |
712 | sym.contents[0] = '\0'; | |
713 | ||
714 | int symlen = 0; | |
715 | ||
fde4eaa1 CV |
716 | /* Make sure to check certain flags on last component only. */ |
717 | for (unsigned pc_flags = opt & (PC_NO_ACCESS_CHECK | PC_KEEP_HANDLE); | |
3f3bd101 | 718 | ; |
fde4eaa1 | 719 | pc_flags = 0) |
3f3bd101 CV |
720 | { |
721 | const suffix_info *suff; | |
722 | char *full_path; | |
1fd5e000 | 723 | |
3f3bd101 CV |
724 | /* Don't allow symlink.check to set anything in the path_conv |
725 | class if we're working on an inner component of the path */ | |
726 | if (component) | |
727 | { | |
728 | suff = NULL; | |
729 | full_path = pathbuf; | |
730 | } | |
731 | else | |
732 | { | |
733 | suff = suffixes; | |
734 | full_path = THIS_path; | |
735 | } | |
7ceb1cac | 736 | |
18578496 CV |
737 | retry_fs_via_processfd: |
738 | ||
3f3bd101 CV |
739 | /* Convert to native path spec sans symbolic link info. */ |
740 | error = mount_table->conv_to_win32_path (path_copy, full_path, | |
c1023ee3 | 741 | dev, &sym.mount_flags); |
2b5803d4 | 742 | |
3f3bd101 CV |
743 | if (error) |
744 | return; | |
ac7bc2d4 | 745 | |
fde4eaa1 | 746 | sym.pc_flags = pc_flags; |
1c1294b4 | 747 | |
3f3bd101 | 748 | if (!dev.exists ()) |
1870c688 | 749 | { |
3f3bd101 CV |
750 | error = ENXIO; |
751 | return; | |
1870c688 | 752 | } |
3f3bd101 CV |
753 | |
754 | if (iscygdrive_dev (dev)) | |
1870c688 | 755 | { |
3f3bd101 CV |
756 | if (!component) |
757 | fileattr = FILE_ATTRIBUTE_DIRECTORY | |
758 | | FILE_ATTRIBUTE_READONLY; | |
759 | else | |
e5b7e4d1 | 760 | { |
3f3bd101 | 761 | fileattr = getfileattr (THIS_path, |
c1023ee3 | 762 | sym.mount_flags & MOUNT_NOPOSIX); |
3f3bd101 | 763 | dev = FH_FS; |
e5b7e4d1 | 764 | } |
3f3bd101 | 765 | goto out; |
1870c688 | 766 | } |
3f3bd101 | 767 | else if (isdev_dev (dev)) |
1870c688 | 768 | { |
3f3bd101 CV |
769 | /* Make sure that the path handling goes on as with FH_FS. */ |
770 | } | |
771 | else if (isvirtual_dev (dev)) | |
772 | { | |
773 | /* FIXME: Calling build_fhandler here is not the right way to | |
774 | handle this. */ | |
775 | fhandler_virtual *fh = (fhandler_virtual *) | |
776 | build_fh_dev (dev, path_copy); | |
777 | virtual_ftype_t file_type; | |
778 | if (!fh) | |
779 | file_type = virt_none; | |
780 | else | |
781 | { | |
782 | file_type = fh->exists (); | |
a3a5d52b CV |
783 | if (file_type == virt_symlink |
784 | || file_type == virt_fdsymlink) | |
3f3bd101 CV |
785 | { |
786 | fh->fill_filebuf (); | |
787 | symlen = sym.set (fh->get_filebuf ()); | |
788 | } | |
f72191ac | 789 | else if (file_type == virt_fsdir && dev == FH_PROCESSFD) |
18578496 CV |
790 | { |
791 | /* FIXME: This is YA bad hack to workaround that | |
792 | we're checking for isvirtual_dev at this point. | |
793 | This should only happen if the file is actually | |
794 | a virtual file, and NOT already if the preceeding | |
795 | path components constitute a virtual file. | |
796 | ||
797 | Anyway, what we do here is this: If the descriptor | |
798 | symlink points to a dir, and if there are trailing | |
799 | path components, it's actually pointing somewhere | |
800 | else. The format_process_fd function returns the | |
801 | full path, resolved symlink plus trailing path | |
802 | components, in its filebuf. This is a POSIX path | |
803 | we know nothing about, so we have to convert it to | |
804 | native again, calling conv_to_win32_path. Since | |
805 | basically nothing happened yet, just copy it over | |
806 | into full_path and jump back to the | |
807 | conv_to_win32_path call. What a mess. */ | |
808 | stpcpy (path_copy, fh->get_filebuf ()); | |
809 | delete fh; | |
810 | goto retry_fs_via_processfd; | |
811 | } | |
6775ac8c KB |
812 | else if (file_type == virt_none && dev == FH_PROCESSFD) |
813 | { | |
814 | error = get_errno (); | |
815 | if (error) | |
816 | { | |
817 | delete fh; | |
818 | return; | |
819 | } | |
820 | } | |
3f3bd101 CV |
821 | delete fh; |
822 | } | |
823 | switch (file_type) | |
824 | { | |
825 | case virt_directory: | |
826 | case virt_rootdir: | |
827 | if (component == 0) | |
828 | fileattr = FILE_ATTRIBUTE_DIRECTORY; | |
829 | break; | |
830 | case virt_file: | |
831 | if (component == 0) | |
832 | fileattr = 0; | |
833 | break; | |
a3a5d52b | 834 | case virt_fdsymlink: |
732613f3 CV |
835 | /* Allow open/linkat to do the right thing. */ |
836 | if (opt & PC_SYM_NOFOLLOW_PROCFD) | |
ba12614f CV |
837 | { |
838 | opt &= ~PC_SYM_FOLLOW; | |
839 | sym.path_flags |= PATH_RESOLVE_PROCFD; | |
840 | } | |
50ad1980 | 841 | fallthrough; |
3f3bd101 CV |
842 | case virt_symlink: |
843 | goto is_virtual_symlink; | |
844 | case virt_pipe: | |
845 | if (component == 0) | |
846 | { | |
847 | fileattr = 0; | |
848 | dev.parse (FH_PIPE); | |
849 | } | |
850 | break; | |
851 | case virt_socket: | |
852 | if (component == 0) | |
853 | { | |
854 | fileattr = 0; | |
eaf35957 | 855 | dev.parse (FH_SOCKET); |
3f3bd101 CV |
856 | } |
857 | break; | |
858 | case virt_fsdir: | |
859 | case virt_fsfile: | |
860 | /* Access to real file or directory via block device | |
861 | entry in /proc/sys. Convert to real file and go with | |
862 | the flow. */ | |
43f65cdd | 863 | dev.parse (FH_FS); |
3f3bd101 CV |
864 | goto is_fs_via_procsys; |
865 | case virt_blk: | |
3434d35a CF |
866 | /* Block special device. Convert to a /dev/sd* like |
867 | block device unless the trailing slash has been | |
868 | requested. In this case, the target is the root | |
869 | directory of the filesystem on this block device. | |
870 | So we convert this to a real file and attach the | |
871 | backslash. */ | |
872 | if (component == 0) | |
3f3bd101 | 873 | { |
3434d35a CF |
874 | fileattr = FILE_ATTRIBUTE_DEVICE; |
875 | if (!need_directory) | |
876 | /* Use a /dev/sd* device number > /dev/sddx. | |
877 | FIXME: Define a new major DEV_ice number. */ | |
878 | dev.parse (DEV_SD_HIGHPART_END, 9999); | |
879 | else | |
880 | { | |
881 | dev.parse (FH_FS); | |
882 | strcat (full_path, "\\"); | |
883 | fileattr |= FILE_ATTRIBUTE_DIRECTORY; | |
884 | } | |
3f3bd101 CV |
885 | goto out; |
886 | } | |
3434d35a | 887 | break; |
3f3bd101 CV |
888 | case virt_chr: |
889 | if (component == 0) | |
890 | fileattr = FILE_ATTRIBUTE_DEVICE; | |
891 | break; | |
892 | default: | |
893 | if (component == 0) | |
894 | fileattr = INVALID_FILE_ATTRIBUTES; | |
895 | goto virtual_component_retry; | |
896 | } | |
897 | if (component == 0 || dev != FH_NETDRIVE) | |
c1023ee3 | 898 | mount_flags |= MOUNT_RO; |
3f3bd101 | 899 | goto out; |
1870c688 | 900 | } |
3f3bd101 CV |
901 | /* devn should not be a device. If it is, then stop parsing. */ |
902 | else if (dev != FH_FS) | |
1870c688 | 903 | { |
3f3bd101 | 904 | fileattr = 0; |
c1023ee3 CV |
905 | mount_flags = sym.mount_flags; |
906 | path_flags = sym.path_flags; | |
3f3bd101 CV |
907 | if (component) |
908 | { | |
909 | error = ENOTDIR; | |
910 | return; | |
911 | } | |
912 | goto out; /* Found a device. Stop parsing. */ | |
1870c688 | 913 | } |
2b5803d4 | 914 | |
3f3bd101 CV |
915 | /* If path is only a drivename, Windows interprets it as the |
916 | current working directory on this drive instead of the root | |
917 | dir which is what we want. So we need the trailing backslash | |
918 | in this case. */ | |
919 | if (full_path[0] && full_path[1] == ':' && full_path[2] == '\0') | |
920 | { | |
921 | full_path[2] = '\\'; | |
922 | full_path[3] = '\0'; | |
923 | } | |
faf07ace | 924 | |
3f3bd101 CV |
925 | /* If the incoming path was given in DOS notation, always treat |
926 | it as caseinsensitive,noacl path. This must be set before | |
927 | calling sym.check, otherwise the path is potentially treated | |
928 | casesensitive. */ | |
929 | if (is_msdos) | |
c1023ee3 | 930 | sym.mount_flags |= MOUNT_NOPOSIX | MOUNT_NOACL; |
35c0485d | 931 | |
3f3bd101 | 932 | is_fs_via_procsys: |
43f65cdd | 933 | |
3f3bd101 | 934 | symlen = sym.check (full_path, suff, fs, conv_handle); |
7ac61736 | 935 | |
3f3bd101 | 936 | is_virtual_symlink: |
2cf9359a | 937 | |
3f3bd101 | 938 | if (sym.isdevice) |
d955b6cf | 939 | { |
3f3bd101 CV |
940 | if (component) |
941 | { | |
942 | error = ENOTDIR; | |
943 | return; | |
944 | } | |
945 | dev.parse (sym.major, sym.minor); | |
946 | dev.setfs (1); | |
b2867a68 | 947 | dev.mode (sym.mode); |
3f3bd101 CV |
948 | fileattr = sym.fileattr; |
949 | goto out; | |
d955b6cf | 950 | } |
70c370d6 | 951 | |
c1023ee3 | 952 | if (sym.path_flags & PATH_SOCKET) |
1870c688 | 953 | { |
3f3bd101 CV |
954 | if (component) |
955 | { | |
956 | error = ENOTDIR; | |
957 | return; | |
958 | } | |
959 | fileattr = sym.fileattr; | |
6c55be9d | 960 | #ifdef __WITH_AF_UNIX |
c1023ee3 | 961 | dev.parse ((sym.path_flags & PATH_REP) ? FH_UNIX : FH_LOCAL); |
6c55be9d CV |
962 | #else |
963 | dev.parse (FH_LOCAL); | |
964 | #endif /* __WITH_AF_UNIX */ | |
3f3bd101 | 965 | dev.setfs (1); |
c1023ee3 CV |
966 | mount_flags = sym.mount_flags; |
967 | path_flags = sym.path_flags; | |
3f3bd101 | 968 | goto out; |
1870c688 | 969 | } |
fc633b63 | 970 | |
3f3bd101 CV |
971 | if (!component) |
972 | { | |
973 | /* Make sure that /dev always exists. */ | |
974 | fileattr = isdev_dev (dev) ? FILE_ATTRIBUTE_DIRECTORY | |
975 | : sym.fileattr; | |
c1023ee3 CV |
976 | mount_flags = sym.mount_flags; |
977 | path_flags = sym.path_flags; | |
3f3bd101 CV |
978 | } |
979 | else if (isdev_dev (dev)) | |
980 | { | |
981 | /* If we're looking for a non-existing file below /dev, | |
982 | make sure that the device type is converted to FH_FS, so | |
983 | that subsequent code handles the file correctly. Unless | |
984 | /dev itself doesn't exist on disk. In that case /dev | |
985 | is handled as virtual filesystem, and virtual filesystems | |
986 | are read-only. The PC_KEEP_HANDLE check allows to check | |
987 | for a call from an informational system call. In that | |
988 | case we just stick to ENOENT, and the device type doesn't | |
989 | matter anyway. */ | |
990 | if (sym.error == ENOENT && !(opt & PC_KEEP_HANDLE)) | |
991 | sym.error = EROFS; | |
992 | else | |
993 | dev = FH_FS; | |
994 | } | |
e4b57503 | 995 | |
3f3bd101 CV |
996 | /* If symlink.check found an existing non-symlink file, then |
997 | it sets the appropriate flag. It also sets any suffix found | |
998 | into `ext_here'. */ | |
999 | if (!sym.issymlink && sym.fileattr != INVALID_FILE_ATTRIBUTES) | |
1870c688 | 1000 | { |
3f3bd101 CV |
1001 | error = sym.error; |
1002 | if (component == 0) | |
1003 | add_ext = true; | |
1004 | else if (!(sym.fileattr & FILE_ATTRIBUTE_DIRECTORY)) | |
1005 | { | |
1006 | error = ENOTDIR; | |
1007 | goto out; | |
1008 | } | |
1009 | goto out; // file found | |
1870c688 | 1010 | } |
3f3bd101 CV |
1011 | /* Found a symlink if symlen > 0. If component == 0, then the |
1012 | src path itself was a symlink. If !follow_mode then | |
1013 | we're done. Otherwise we have to insert the path found | |
1014 | into the full path that we are building and perform all of | |
1015 | these operations again on the newly derived path. */ | |
1016 | else if (symlen > 0) | |
1870c688 | 1017 | { |
26425142 | 1018 | if (component == 0 |
3f3bd101 | 1019 | && (!(opt & PC_SYM_FOLLOW) |
aec64798 | 1020 | || (is_winapi_reparse_point () |
3f3bd101 | 1021 | && (opt & PC_SYM_NOFOLLOW_REP)))) |
1870c688 | 1022 | { |
26425142 CV |
1023 | /* Usually a trailing slash requires to follow a symlink, |
1024 | even with PC_SYM_NOFOLLOW. The reason is that "foo/" | |
1025 | is equivalent to "foo/." so the symlink is in fact not | |
1026 | the last path component. | |
1027 | ||
1028 | PC_SYM_NOFOLLOW_DIR is used to indicate that the | |
1029 | last path component is the target symlink and the | |
1030 | trailing slash is supposed to be ignored. */ | |
1031 | if (!need_directory || (opt & PC_SYM_NOFOLLOW_DIR)) | |
3f3bd101 | 1032 | { |
26425142 CV |
1033 | /* last component of path is a symlink. */ |
1034 | set_symlink (symlen); | |
1035 | /* make sure not to set errno to ENOTDIR. */ | |
1036 | need_directory = 0; | |
1037 | if (opt & PC_SYM_CONTENTS) | |
1038 | { | |
1039 | strcpy (THIS_path, sym.contents); | |
1040 | goto out; | |
1041 | } | |
1042 | add_ext = true; | |
3f3bd101 CV |
1043 | goto out; |
1044 | } | |
1870c688 | 1045 | } |
3f3bd101 CV |
1046 | /* Following a symlink we can't trust the collected |
1047 | filesystem information any longer. */ | |
1048 | fs.clear (); | |
1049 | /* Close handle, if we have any. Otherwise we're collecting | |
1050 | handles while following symlinks. */ | |
1051 | conv_handle.close (); | |
1052 | break; | |
1053 | } | |
1054 | else if (sym.error && sym.error != ENOENT) | |
1055 | { | |
1056 | error = sym.error; | |
1870c688 CV |
1057 | goto out; |
1058 | } | |
3f3bd101 CV |
1059 | /* No existing file found. */ |
1060 | ||
1061 | virtual_component_retry: | |
1062 | /* Find the new "tail" of the path, e.g. in '/for/bar/baz', | |
1063 | /baz is the tail. */ | |
1064 | if (tail != path_end) | |
1065 | *tail = '/'; | |
1066 | while (--tail > path_copy + 1 && *tail != '/') {} | |
1067 | /* Exit loop if there is no tail or we are at the | |
1068 | beginning of a UNC path */ | |
1069 | if (tail <= path_copy + 1) | |
1070 | goto out; // all done | |
1071 | ||
1072 | /* Haven't found an existing pathname component yet. | |
1073 | Pinch off the tail and try again. */ | |
1074 | *tail = '\0'; | |
1075 | component++; | |
1870c688 | 1076 | } |
3f3bd101 CV |
1077 | |
1078 | /* Arrive here if above loop detected a symlink. */ | |
1079 | if (++loop > SYMLOOP_MAX) | |
e4b57503 | 1080 | { |
3f3bd101 CV |
1081 | error = ELOOP; // Eep. |
1082 | return; | |
e4b57503 | 1083 | } |
1fd5e000 | 1084 | |
3f3bd101 CV |
1085 | /* Place the link content, possibly with head and/or tail, |
1086 | in tmp_buf */ | |
1fd5e000 | 1087 | |
3f3bd101 CV |
1088 | char *headptr; |
1089 | if (isabspath (sym.contents)) | |
1090 | headptr = tmp_buf; /* absolute path */ | |
1091 | else | |
1092 | { | |
1093 | /* Copy the first part of the path (with ending /) and point to | |
1094 | the end. */ | |
1095 | char *prevtail = tail; | |
1096 | while (--prevtail > path_copy && *prevtail != '/') {} | |
1097 | int headlen = prevtail - path_copy + 1;; | |
1098 | memcpy (tmp_buf, path_copy, headlen); | |
1099 | headptr = &tmp_buf[headlen]; | |
1100 | } | |
fe6934da | 1101 | |
3f3bd101 CV |
1102 | /* Make sure there is enough space */ |
1103 | if (headptr + symlen >= tmp_buf + (2 * NT_MAX_PATH)) | |
1104 | { | |
1105 | too_long: | |
1106 | error = ENAMETOOLONG; | |
1107 | set_path ("::ENAMETOOLONG::"); | |
1108 | return; | |
1109 | } | |
7ceb1cac | 1110 | |
3f3bd101 CV |
1111 | /* Copy the symlink contents to the end of tmp_buf. |
1112 | Convert slashes. */ | |
1113 | for (char *p = sym.contents; *p; p++) | |
1114 | *headptr++ = *p == '\\' ? '/' : *p; | |
1115 | *headptr = '\0'; | |
1fd5e000 | 1116 | |
3f3bd101 CV |
1117 | /* Copy any tail component (with the 0) */ |
1118 | if (tail++ < path_end) | |
1119 | { | |
1120 | /* Add a slash if needed. There is space. */ | |
1121 | if (*(headptr - 1) != '/') | |
1122 | *headptr++ = '/'; | |
1123 | int taillen = path_end - tail + 1; | |
1124 | if (headptr + taillen > tmp_buf + (2 * NT_MAX_PATH)) | |
1125 | goto too_long; | |
1126 | memcpy (headptr, tail, taillen); | |
1127 | } | |
1128 | ||
1129 | /* Evaluate everything all over again. */ | |
1130 | src = tmp_buf; | |
1870c688 | 1131 | } |
1fd5e000 | 1132 | |
3f3bd101 CV |
1133 | if (!(opt & PC_SYM_CONTENTS)) |
1134 | add_ext = true; | |
1135 | ||
1136 | out: | |
1137 | set_path (THIS_path); | |
1138 | if (add_ext) | |
1139 | add_ext_from_sym (sym); | |
1140 | if (dev == FH_NETDRIVE && component) | |
1141 | { | |
1142 | /* This case indicates a non-existant resp. a non-retrievable | |
1143 | share. This happens for instance if the share is a printer. | |
1144 | In this case the path must not be treated like a FH_NETDRIVE, | |
1145 | but like a FH_FS instead, so the usual open call for files | |
1146 | is used on it. */ | |
1147 | dev.parse (FH_FS); | |
1148 | } | |
1149 | else if (isproc_dev (dev) && fileattr == INVALID_FILE_ATTRIBUTES) | |
1870c688 | 1150 | { |
3f3bd101 CV |
1151 | /* FIXME: Usually we don't set error to ENOENT if a file doesn't |
1152 | exist. This is typically indicated by the fileattr content. | |
1153 | So, why here? The downside is that cygwin_conv_path just gets | |
1154 | an error for these paths so it reports the error back to the | |
1155 | application. Unlike in all other cases of non-existant files, | |
1156 | for which check doesn't set error, so cygwin_conv_path just | |
1157 | returns the path, as intended. */ | |
1158 | error = ENOENT; | |
1870c688 CV |
1159 | return; |
1160 | } | |
3f3bd101 CV |
1161 | else if (!need_directory || error) |
1162 | /* nothing to do */; | |
1163 | else if (fileattr == INVALID_FILE_ATTRIBUTES) | |
1164 | /* Reattach trailing dirsep in native path. */ | |
1165 | strcat (modifiable_path (), "\\"); | |
1166 | else if (fileattr & FILE_ATTRIBUTE_DIRECTORY) | |
1167 | path_flags &= ~PATH_SYMLINK; | |
1168 | else | |
1870c688 | 1169 | { |
3f3bd101 CV |
1170 | debug_printf ("%s is a non-directory", path); |
1171 | error = ENOTDIR; | |
1172 | return; | |
1870c688 | 1173 | } |
70300fdb | 1174 | |
3f3bd101 | 1175 | if (dev.isfs ()) |
1870c688 | 1176 | { |
3f3bd101 CV |
1177 | /* If FS hasn't been checked already in symlink_info::check, |
1178 | do so now. */ | |
1179 | if (fs.inited ()|| fs.update (get_nt_native_path (), NULL)) | |
1180 | { | |
1181 | /* Incoming DOS paths are treated like DOS paths in native | |
1182 | Windows applications. No ACLs, just default settings. */ | |
1183 | if (is_msdos) | |
1184 | fs.has_acls (false); | |
1185 | debug_printf ("this->path(%s), has_acls(%d)", | |
1186 | path, fs.has_acls ()); | |
1187 | /* CV: We could use this->has_acls() but I want to make sure that | |
c1023ee3 | 1188 | we don't forget that the MOUNT_NOACL flag must be taken into |
3f3bd101 | 1189 | account here. */ |
c1023ee3 | 1190 | if (!(mount_flags & MOUNT_NOACL) && fs.has_acls ()) |
3f3bd101 CV |
1191 | set_exec (0); /* We really don't know if this is executable or |
1192 | not here but set it to not executable since | |
1193 | it will be figured out later by anything | |
1194 | which cares about this. */ | |
1870c688 | 1195 | } |
fde4eaa1 | 1196 | /* If the FS has been found to have unreliable inodes, note |
c1023ee3 | 1197 | that in mount_flags. */ |
3f3bd101 | 1198 | if (!fs.hasgood_inode ()) |
c1023ee3 | 1199 | mount_flags |= MOUNT_IHASH; |
3f3bd101 CV |
1200 | /* If the OS is caseinsensitive or the FS is caseinsensitive, |
1201 | don't handle path casesensitive. */ | |
1202 | if (cygwin_shared->obcaseinsensitive || fs.caseinsensitive ()) | |
c1023ee3 CV |
1203 | mount_flags |= MOUNT_NOPOSIX; |
1204 | caseinsensitive = (mount_flags & MOUNT_NOPOSIX) | |
3f3bd101 CV |
1205 | ? OBJ_CASE_INSENSITIVE : 0; |
1206 | if (exec_state () != dont_know_if_executable) | |
1207 | /* ok */; | |
1208 | else if (isdir ()) | |
1209 | set_exec (1); | |
1210 | else if (issymlink () || issocket ()) | |
1211 | set_exec (0); | |
1870c688 | 1212 | } |
91a2f87b | 1213 | |
3f3bd101 CV |
1214 | if (opt & PC_NOFULL) |
1215 | { | |
1216 | if (is_relpath) | |
1870c688 | 1217 | { |
3f3bd101 CV |
1218 | mkrelpath (this->modifiable_path (), !!caseinsensitive); |
1219 | /* Invalidate wide_path so that wide relpath can be created | |
1220 | in later calls to get_nt_native_path or get_wide_win32_path. */ | |
1221 | if (wide_path) | |
1222 | cfree (wide_path); | |
1223 | wide_path = NULL; | |
1224 | } | |
1225 | if (need_directory) | |
1226 | { | |
1227 | size_t n = strlen (this->path); | |
1228 | /* Do not add trailing \ to UNC device names like \\.\a: */ | |
1229 | if (this->path[n - 1] != '\\' && | |
1230 | (strncmp (this->path, "\\\\.\\", 4) != 0)) | |
1231 | { | |
1232 | this->modifiable_path ()[n] = '\\'; | |
1233 | this->modifiable_path ()[n + 1] = '\0'; | |
1234 | } | |
1870c688 CV |
1235 | } |
1236 | } | |
7ac61736 | 1237 | |
3f3bd101 CV |
1238 | if (opt & PC_OPEN) |
1239 | path_flags |= PATH_OPEN; | |
23771fa1 | 1240 | |
3f3bd101 CV |
1241 | if (opt & PC_CTTY) |
1242 | path_flags |= PATH_CTTY; | |
23771fa1 | 1243 | |
3f3bd101 CV |
1244 | if (opt & PC_POSIX) |
1245 | { | |
1246 | if (tail < path_end && tail > path_copy + 1) | |
1247 | *tail = '/'; | |
d2bd82aa | 1248 | set_posix (path_copy); |
3f3bd101 | 1249 | } |
81adfe28 CF |
1250 | |
1251 | #if 0 | |
3f3bd101 CV |
1252 | if (!error) |
1253 | { | |
1254 | last_path_conv = *this; | |
1255 | strcpy (last_src, src); | |
1256 | } | |
1257 | #endif | |
1258 | } | |
1259 | __except (NO_ERROR) | |
1870c688 | 1260 | { |
3f3bd101 | 1261 | error = EFAULT; |
1870c688 | 1262 | } |
3f3bd101 | 1263 | __endtry |
1870c688 | 1264 | } |
81adfe28 | 1265 | |
91b264c7 CV |
1266 | struct pc_flat |
1267 | { | |
1268 | path_conv pc; | |
1269 | HANDLE hdl; | |
1270 | size_t name_len; | |
1271 | size_t posix_len; | |
1272 | char data[0]; | |
1273 | }; | |
1274 | ||
1275 | void * | |
1276 | path_conv::serialize (HANDLE h, unsigned int &n) const | |
1277 | { | |
1278 | pc_flat *pcf; | |
1279 | size_t nlen = 0, plen = 0; | |
1280 | char *p; | |
1281 | ||
1282 | if (path) | |
1283 | nlen = strlen (path) + 1; | |
1284 | if (posix_path) | |
1285 | plen = strlen (posix_path) + 1; | |
1286 | n = sizeof (pc_flat) + nlen + plen; | |
1287 | pcf = (pc_flat *) cmalloc (HEAP_COMMUNE, n); | |
1288 | if (!pcf) | |
1289 | { | |
1290 | n = 0; | |
1291 | return NULL; | |
1292 | } | |
f0cf44dc | 1293 | memcpy ((void *) &pcf->pc, this, sizeof *this); |
91b264c7 CV |
1294 | pcf->hdl = h; |
1295 | pcf->name_len = nlen; | |
1296 | pcf->posix_len = plen; | |
1297 | p = pcf->data; | |
1298 | if (nlen) | |
1299 | p = stpcpy (p, path) + 1; | |
1300 | if (plen) | |
1301 | stpcpy (p, posix_path); | |
1302 | return pcf; | |
1303 | } | |
1304 | ||
1305 | HANDLE | |
1306 | path_conv::deserialize (void *bufp) | |
1307 | { | |
1308 | pc_flat *pcf = (pc_flat *) bufp; | |
1309 | char *p; | |
1310 | HANDLE ret; | |
1311 | ||
f0cf44dc | 1312 | memcpy ((void *) this, &pcf->pc, sizeof *this); |
91b264c7 CV |
1313 | wide_path = uni_path.Buffer = NULL; |
1314 | uni_path.MaximumLength = uni_path.Length = 0; | |
1315 | path = posix_path = NULL; | |
1316 | p = pcf->data; | |
1317 | if (pcf->name_len) | |
1318 | { | |
1319 | set_path (p); | |
1320 | p += pcf->name_len; | |
1321 | } | |
1322 | if (pcf->posix_len) | |
1323 | set_posix (p); | |
1324 | dev.parse (pcf->pc.dev); | |
1325 | ret = pcf->hdl; | |
1326 | cfree (bufp); | |
1327 | return ret; | |
1328 | } | |
1329 | ||
1870c688 CV |
1330 | path_conv::~path_conv () |
1331 | { | |
d2bd82aa | 1332 | if (posix_path) |
1870c688 | 1333 | { |
d2bd82aa CV |
1334 | cfree ((void *) posix_path); |
1335 | posix_path = NULL; | |
1870c688 | 1336 | } |
0986989f CV |
1337 | if (path) |
1338 | { | |
fafbf755 | 1339 | cfree (modifiable_path ()); |
0986989f CV |
1340 | path = NULL; |
1341 | } | |
1870c688 CV |
1342 | if (wide_path) |
1343 | { | |
1344 | cfree (wide_path); | |
1345 | wide_path = NULL; | |
1346 | } | |
5a0d1edb | 1347 | close_conv_handle (); |
1870c688 CV |
1348 | } |
1349 | ||
1350 | bool | |
1351 | path_conv::is_binary () | |
1352 | { | |
1353 | tmp_pathbuf tp; | |
1354 | PWCHAR bintest = tp.w_get (); | |
1355 | DWORD bin; | |
c32849c5 | 1356 | |
3bee7767 CV |
1357 | return GetBinaryTypeW (get_wide_win32_path (bintest), &bin) |
1358 | && (bin == SCS_32BIT_BINARY || bin == SCS_64BIT_BINARY); | |
1870c688 CV |
1359 | } |
1360 | ||
eed35efb | 1361 | /* Helper function to fill the fai datastructure for a file. */ |
3780d205 | 1362 | NTSTATUS |
eed35efb | 1363 | file_get_fai (HANDLE h, PFILE_ALL_INFORMATION pfai) |
3780d205 CV |
1364 | { |
1365 | NTSTATUS status; | |
1366 | IO_STATUS_BLOCK io; | |
1367 | ||
1368 | /* Some FSes (Netapps) don't implement FileNetworkOpenInformation. */ | |
eed35efb CV |
1369 | status = NtQueryInformationFile (h, &io, pfai, sizeof *pfai, |
1370 | FileAllInformation); | |
9c4113f0 | 1371 | if (likely (status == STATUS_BUFFER_OVERFLOW)) |
eed35efb | 1372 | status = STATUS_SUCCESS; |
9c4113f0 CV |
1373 | /* Filesystems with broken FileAllInformation exist, too. See the thread |
1374 | starting with https://cygwin.com/ml/cygwin/2016-07/msg00350.html. */ | |
1375 | else if (!NT_SUCCESS (status) && status != STATUS_ACCESS_DENIED) | |
1376 | { | |
1377 | memset (pfai, 0, sizeof *pfai); | |
1378 | status = NtQueryInformationFile (h, &io, &pfai->BasicInformation, | |
1379 | sizeof pfai->BasicInformation, | |
1380 | FileBasicInformation); | |
1381 | if (NT_SUCCESS (status)) | |
1382 | { | |
1383 | /* The return value of FileInternalInformation is largely ignored. | |
1384 | We only make absolutely sure the inode number is set to 0 in | |
1385 | case it fails. */ | |
1386 | status = NtQueryInformationFile (h, &io, &pfai->InternalInformation, | |
1387 | sizeof pfai->InternalInformation, | |
1388 | FileInternalInformation); | |
1389 | if (!NT_SUCCESS (status)) | |
1390 | pfai->InternalInformation.IndexNumber.QuadPart = 0LL; | |
1391 | status = NtQueryInformationFile (h, &io, &pfai->StandardInformation, | |
1392 | sizeof pfai->StandardInformation, | |
1393 | FileStandardInformation); | |
1394 | } | |
1395 | } | |
3780d205 CV |
1396 | return status; |
1397 | } | |
1398 | ||
1870c688 CV |
1399 | /* Normalize a Win32 path. |
1400 | /'s are converted to \'s in the process. | |
1401 | All duplicate \'s, except for 2 leading \'s, are deleted. | |
1402 | ||
1403 | The result is 0 for success, or an errno error value. | |
1404 | FIXME: A lot of this should be mergeable with the POSIX critter. */ | |
1405 | int | |
1406 | normalize_win32_path (const char *src, char *dst, char *&tail) | |
1407 | { | |
1408 | const char *src_start = src; | |
35998fc2 | 1409 | const char *dst_start = dst; |
1870c688 CV |
1410 | bool beg_src_slash = isdirsep (src[0]); |
1411 | ||
1412 | tail = dst; | |
283cb372 | 1413 | /* Skip Win32 long path name prefix and NT object directory prefix. */ |
1870c688 CV |
1414 | if (beg_src_slash && (src[1] == '?' || isdirsep (src[1])) |
1415 | && src[2] == '?' && isdirsep (src[3])) | |
1416 | { | |
1417 | src += 4; | |
85aff283 | 1418 | if (isdrive (src) && (isdirsep (src[2]) || !src[2])) |
283cb372 KB |
1419 | beg_src_slash = false; |
1420 | else if (!strncmp (src, "UNC", 3) && isdirsep (src[3])) | |
1421 | /* native UNC path */ | |
1d011c0a | 1422 | src += 2; /* Fortunately the first char is not copied... */ |
1870c688 | 1423 | else |
283cb372 | 1424 | return EINVAL; |
1870c688 CV |
1425 | } |
1426 | if (beg_src_slash && isdirsep (src[1])) | |
1427 | { | |
1428 | if (isdirsep (src[2])) | |
1429 | { | |
1430 | /* More than two slashes are just folded into one. */ | |
81adfe28 | 1431 | src += 2; |
1870c688 CV |
1432 | while (isdirsep (src[1])) |
1433 | ++src; | |
1434 | } | |
1435 | else | |
1436 | { | |
1437 | /* Two slashes start a network or device path. */ | |
1438 | *tail++ = '\\'; | |
1439 | src++; | |
1440 | if (src[1] == '.' && isdirsep (src[2])) | |
1441 | { | |
81adfe28 | 1442 | *tail++ = '\\'; |
1870c688 CV |
1443 | *tail++ = '.'; |
1444 | src += 2; | |
1445 | } | |
1446 | } | |
35998fc2 CV |
1447 | dst = tail; |
1448 | /* If backslash is missing in src, add one. */ | |
1449 | if (!isdirsep (src[0])) | |
1450 | *tail++ = '\\'; | |
1870c688 | 1451 | } |
35998fc2 | 1452 | if (tail == dst_start) |
1870c688 | 1453 | { |
54a83cc6 | 1454 | if (isdrive (src)) |
35998fc2 CV |
1455 | { |
1456 | /* Always convert drive letter to uppercase for case sensitivity. */ | |
1457 | *tail++ = cyg_toupper (*src++); | |
1458 | *tail++ = *src++; | |
1459 | dst = tail; | |
1460 | /* If backslash is missing in src, add one. */ | |
1461 | if (!isdirsep (src[0])) | |
1462 | *tail++ = '\\'; | |
1463 | } | |
54a83cc6 | 1464 | else if (*src != '/') |
1870c688 | 1465 | { |
3a880bf5 CV |
1466 | /* Make sure dst points to the rightmost backslash which must not |
1467 | be backtracked over during ".." evaluation. This is either | |
1468 | the backslash after the network path prefix (i.e. "\\") or | |
1469 | the backslash after a drive letter (i.e. C:\"). */ | |
54a83cc6 | 1470 | if (beg_src_slash) |
3a880bf5 CV |
1471 | { |
1472 | tail += cygheap->cwd.get_drive (dst); | |
1473 | /* network path, drive == '\\\\'? Decrement tail to avoid | |
1474 | triple backslash in output. */ | |
1475 | if (dst[0] == '\\') | |
1476 | --tail; | |
1477 | dst = tail; | |
1478 | } | |
35998fc2 | 1479 | else if (cygheap->cwd.get (dst, 0)) |
54a83cc6 CV |
1480 | { |
1481 | tail = strchr (tail, '\0'); | |
1482 | if (tail[-1] != '\\') | |
1483 | *tail++ = '\\'; | |
3a880bf5 CV |
1484 | ++dst; |
1485 | if (dst[1] == '\\') | |
1486 | ++dst; | |
54a83cc6 | 1487 | } |
35998fc2 CV |
1488 | else |
1489 | return get_errno (); | |
1870c688 CV |
1490 | } |
1491 | } | |
81adfe28 | 1492 | |
35998fc2 CV |
1493 | /* At this point dst points to the first backslash, even if it only gets |
1494 | written in the first iteration of the following loop. Backing up to | |
1495 | handle ".." components can not underrun that border (thus avoiding | |
1496 | subsequent buffer underruns with fatal results). */ | |
1870c688 CV |
1497 | while (*src) |
1498 | { | |
1499 | /* Strip duplicate /'s. */ | |
1500 | if (isdirsep (src[0]) && isdirsep (src[1])) | |
1501 | src++; | |
1502 | /* Ignore "./". */ | |
1503 | else if (src[0] == '.' && isdirsep (src[1]) | |
1504 | && (src == src_start || isdirsep (src[-1]))) | |
f0ae353a CV |
1505 | { |
1506 | src += 2; | |
1507 | /* Skip /'s to the next path component. */ | |
1508 | while (isdirsep (*src)) | |
1509 | src++; | |
1510 | } | |
1870c688 CV |
1511 | |
1512 | /* Backup if "..". */ | |
3a880bf5 | 1513 | else if (src[0] == '.' && src[1] == '.' && tail[-1] == '\\') |
1870c688 CV |
1514 | { |
1515 | if (!isdirsep (src[2]) && src[2] != '\0') | |
1516 | *tail++ = *src++; | |
1517 | else | |
1518 | { | |
1519 | /* Back up over /, but not if it's the first one. */ | |
1520 | if (tail > dst + 1) | |
1521 | tail--; | |
1522 | /* Now back up to the next /. */ | |
1523 | while (tail > dst + 1 && tail[-1] != '\\' && tail[-2] != ':') | |
1524 | tail--; | |
1525 | src += 2; | |
787908c1 CV |
1526 | /* Skip /'s to the next path component. */ |
1527 | while (isdirsep (*src)) | |
1870c688 CV |
1528 | src++; |
1529 | } | |
1530 | } | |
1531 | /* Otherwise, add char to result. */ | |
1532 | else | |
1533 | { | |
1534 | if (*src == '/') | |
1535 | *tail++ = '\\'; | |
1536 | else | |
1537 | *tail++ = *src; | |
1538 | src++; | |
1539 | } | |
1540 | if ((tail - dst) >= NT_MAX_PATH) | |
1541 | return ENAMETOOLONG; | |
1542 | } | |
c4441d46 CF |
1543 | if (tail > dst + 1 && tail[-1] == '.' && tail[-2] == '\\') |
1544 | tail--; | |
1870c688 | 1545 | *tail = '\0'; |
35998fc2 | 1546 | debug_printf ("%s = normalize_win32_path (%s)", dst_start, src_start); |
1870c688 CV |
1547 | return 0; |
1548 | } | |
1549 | ||
1550 | /* Various utilities. */ | |
1551 | ||
1552 | /* nofinalslash: Remove trailing / and \ from SRC (except for the | |
1553 | first one). It is ok for src == dst. */ | |
1554 | ||
1f36328e | 1555 | void __reg2 |
1870c688 CV |
1556 | nofinalslash (const char *src, char *dst) |
1557 | { | |
1558 | int len = strlen (src); | |
1559 | if (src != dst) | |
1560 | memcpy (dst, src, len + 1); | |
1561 | while (len > 1 && isdirsep (dst[--len])) | |
1562 | dst[len] = '\0'; | |
1563 | } | |
1564 | ||
1565 | /* conv_path_list: Convert a list of path names to/from Win32/POSIX. */ | |
1566 | ||
1567 | static int | |
a887cf0e CV |
1568 | conv_path_list (const char *src, char *dst, size_t size, |
1569 | cygwin_conv_path_t what) | |
1870c688 CV |
1570 | { |
1571 | tmp_pathbuf tp; | |
1572 | char src_delim, dst_delim; | |
1870c688 | 1573 | size_t len; |
a887cf0e | 1574 | bool env_cvt = false; |
1870c688 | 1575 | |
a887cf0e CV |
1576 | if (what == (cygwin_conv_path_t) ENV_CVT) |
1577 | { | |
1578 | what = CCP_WIN_A_TO_POSIX | CCP_RELATIVE; | |
1579 | env_cvt = true; | |
1580 | } | |
5250e27f | 1581 | if ((what & CCP_CONVTYPE_MASK) == CCP_WIN_A_TO_POSIX) |
1870c688 CV |
1582 | { |
1583 | src_delim = ';'; | |
1584 | dst_delim = ':'; | |
1870c688 CV |
1585 | } |
1586 | else | |
1587 | { | |
1588 | src_delim = ':'; | |
1589 | dst_delim = ';'; | |
1870c688 | 1590 | } |
81adfe28 | 1591 | |
1870c688 CV |
1592 | char *srcbuf; |
1593 | len = strlen (src) + 1; | |
1594 | if (len <= NT_MAX_PATH * sizeof (WCHAR)) | |
1595 | srcbuf = (char *) tp.w_get (); | |
1596 | else | |
1597 | srcbuf = (char *) alloca (len); | |
1598 | ||
1599 | int err = 0; | |
1600 | char *d = dst - 1; | |
1601 | bool saw_empty = false; | |
1602 | do | |
1603 | { | |
cecc445d CV |
1604 | char *srcpath = srcbuf; |
1605 | char *s = strccpy (srcpath, &src, src_delim); | |
1606 | size_t len = s - srcpath; | |
1870c688 CV |
1607 | if (len >= NT_MAX_PATH) |
1608 | { | |
1609 | err = ENAMETOOLONG; | |
81adfe28 | 1610 | break; |
1870c688 | 1611 | } |
cecc445d CV |
1612 | /* Paths in Win32 path lists in the environment (%Path%), are often |
1613 | enclosed in quotes (usually paths with spaces). Trailing backslashes | |
1614 | are common, too. Remove them. */ | |
a887cf0e | 1615 | if (env_cvt && len) |
cecc445d CV |
1616 | { |
1617 | if (*srcpath == '"') | |
1618 | { | |
1619 | ++srcpath; | |
1620 | *--s = '\0'; | |
1621 | len -= 2; | |
1622 | } | |
1623 | while (len && s[-1] == '\\') | |
1624 | { | |
1625 | *--s = '\0'; | |
1626 | --len; | |
1627 | } | |
1628 | } | |
1870c688 CV |
1629 | if (len) |
1630 | { | |
1631 | ++d; | |
a887cf0e | 1632 | err = cygwin_conv_path (what, srcpath, d, size - (d - dst)); |
1870c688 | 1633 | } |
a887cf0e | 1634 | else if ((what & CCP_CONVTYPE_MASK) == CCP_POSIX_TO_WIN_A) |
1870c688 CV |
1635 | { |
1636 | ++d; | |
a887cf0e | 1637 | err = cygwin_conv_path (what, ".", d, size - (d - dst)); |
1870c688 CV |
1638 | } |
1639 | else | |
1640 | { | |
a887cf0e | 1641 | if (env_cvt) |
1870c688 CV |
1642 | saw_empty = true; |
1643 | continue; | |
1644 | } | |
1645 | if (err) | |
1646 | break; | |
1647 | d = strchr (d, '\0'); | |
1648 | *d = dst_delim; | |
1649 | } | |
1650 | while (*src++); | |
1651 | ||
1652 | if (saw_empty) | |
1653 | err = EIDRM; | |
1654 | ||
1655 | if (d < dst) | |
1656 | d++; | |
1657 | *d = '\0'; | |
1658 | return err; | |
1659 | } | |
1660 | ||
1661 | /********************** Symbolic Link Support **************************/ | |
1662 | ||
1663 | /* Create a symlink from FROMPATH to TOPATH. */ | |
1664 | ||
1870c688 CV |
1665 | extern "C" int |
1666 | symlink (const char *oldpath, const char *newpath) | |
1667 | { | |
4bfa93f1 CV |
1668 | path_conv win32_newpath; |
1669 | ||
1670 | __try | |
1671 | { | |
1672 | if (!*oldpath || !*newpath) | |
1673 | { | |
1674 | set_errno (ENOENT); | |
1675 | __leave; | |
1676 | } | |
1677 | ||
1678 | /* Trailing dirsep is a no-no, only errno differs. */ | |
1679 | bool has_trailing_dirsep = isdirsep (newpath[strlen (newpath) - 1]); | |
1680 | win32_newpath.check (newpath, | |
1681 | PC_SYM_NOFOLLOW | PC_SYM_NOFOLLOW_DIR | PC_POSIX, | |
1682 | stat_suffixes); | |
1683 | ||
1684 | if (win32_newpath.error || has_trailing_dirsep) | |
1685 | { | |
1686 | set_errno (win32_newpath.error ?: | |
1687 | win32_newpath.exists () ? EEXIST : ENOENT); | |
1688 | __leave; | |
1689 | } | |
1690 | ||
1691 | return symlink_worker (oldpath, win32_newpath, false); | |
1692 | } | |
1693 | __except (EFAULT) {} | |
1694 | __endtry | |
1695 | return -1; | |
9ecd475c CV |
1696 | } |
1697 | ||
1698 | static int | |
1699 | symlink_nfs (const char *oldpath, path_conv &win32_newpath) | |
1700 | { | |
1701 | /* On NFS, create symlinks by calling NtCreateFile with an EA of type | |
1702 | NfsSymlinkTargetName containing ... the symlink target name. */ | |
1703 | tmp_pathbuf tp; | |
1704 | PFILE_FULL_EA_INFORMATION pffei; | |
1705 | NTSTATUS status; | |
1706 | HANDLE fh; | |
1707 | OBJECT_ATTRIBUTES attr; | |
1708 | IO_STATUS_BLOCK io; | |
1709 | ||
1710 | pffei = (PFILE_FULL_EA_INFORMATION) tp.w_get (); | |
1711 | pffei->NextEntryOffset = 0; | |
1712 | pffei->Flags = 0; | |
1713 | pffei->EaNameLength = sizeof (NFS_SYML_TARGET) - 1; | |
1714 | char *EaValue = stpcpy (pffei->EaName, NFS_SYML_TARGET) + 1; | |
1715 | pffei->EaValueLength = sizeof (WCHAR) * | |
1716 | (sys_mbstowcs ((PWCHAR) EaValue, NT_MAX_PATH, oldpath) - 1); | |
1717 | status = NtCreateFile (&fh, FILE_WRITE_DATA | FILE_WRITE_EA | SYNCHRONIZE, | |
1718 | win32_newpath.get_object_attr (attr, sec_none_nih), | |
1719 | &io, NULL, FILE_ATTRIBUTE_SYSTEM, | |
1720 | FILE_SHARE_VALID_FLAGS, FILE_CREATE, | |
1721 | FILE_SYNCHRONOUS_IO_NONALERT | |
1722 | | FILE_OPEN_FOR_BACKUP_INTENT, | |
1723 | pffei, NT_MAX_PATH * sizeof (WCHAR)); | |
1724 | if (!NT_SUCCESS (status)) | |
1725 | { | |
1726 | __seterrno_from_nt_status (status); | |
1727 | return -1; | |
1728 | } | |
1729 | NtClose (fh); | |
1730 | return 0; | |
1731 | } | |
1732 | ||
2566c2e6 CV |
1733 | /* Count backslashes between s and e. */ |
1734 | static inline int | |
1735 | cnt_bs (PWCHAR s, PWCHAR e) | |
1736 | { | |
1737 | int num = 0; | |
1738 | ||
1739 | while (s < e) | |
1740 | if (*s++ == L'\\') | |
1741 | ++num; | |
1742 | return num; | |
1743 | } | |
1744 | ||
ffcfbf4b CV |
1745 | #ifndef SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE |
1746 | #define SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE 2 | |
1747 | #endif | |
1748 | ||
9ecd475c CV |
1749 | static int |
1750 | symlink_native (const char *oldpath, path_conv &win32_newpath) | |
1751 | { | |
1752 | tmp_pathbuf tp; | |
1753 | path_conv win32_oldpath; | |
1754 | PUNICODE_STRING final_oldpath, final_newpath; | |
2566c2e6 | 1755 | UNICODE_STRING final_oldpath_buf; |
ffcfbf4b | 1756 | DWORD flags; |
9ecd475c CV |
1757 | |
1758 | if (isabspath (oldpath)) | |
1759 | { | |
1760 | win32_oldpath.check (oldpath, PC_SYM_NOFOLLOW, stat_suffixes); | |
1761 | final_oldpath = win32_oldpath.get_nt_native_path (); | |
9ecd475c CV |
1762 | } |
1763 | else | |
1764 | { | |
1765 | /* The symlink target is relative to the directory in which | |
1766 | the symlink gets created, not relative to the cwd. Therefore | |
1767 | we have to mangle the path quite a bit before calling path_conv. */ | |
d2bd82aa CV |
1768 | ssize_t len = strrchr (win32_newpath.get_posix (), '/') |
1769 | - win32_newpath.get_posix () + 1; | |
9ecd475c | 1770 | char *absoldpath = tp.t_get (); |
d2bd82aa | 1771 | stpcpy (stpncpy (absoldpath, win32_newpath.get_posix (), len), |
9ecd475c CV |
1772 | oldpath); |
1773 | win32_oldpath.check (absoldpath, PC_SYM_NOFOLLOW, stat_suffixes); | |
2566c2e6 CV |
1774 | |
1775 | /* Try hard to keep Windows symlink path relative. */ | |
1776 | ||
75565231 CV |
1777 | /* 1. Find common path prefix. Skip leading \\?\, but take pre-increment |
1778 | of the following loop into account. */ | |
1779 | PWCHAR c_old = win32_oldpath.get_nt_native_path ()->Buffer + 3; | |
1780 | PWCHAR c_new = win32_newpath.get_nt_native_path ()->Buffer + 3; | |
1781 | /* Windows compatible == always check case insensitive. */ | |
1782 | while (towupper (*++c_old) == towupper (*++c_new)) | |
2566c2e6 CV |
1783 | ; |
1784 | /* The last component could share a common prefix, so make sure we end | |
1785 | up on the first char after the last common backslash. */ | |
1786 | while (c_old[-1] != L'\\') | |
1787 | --c_old, --c_new; | |
1788 | ||
1789 | /* 2. Check if prefix is long enough. The prefix must at least points to | |
1790 | a complete device: \\?\X:\ or \\?\UNC\server\share\ are the minimum | |
1791 | prefix strings. We start counting behind the \\?\ for speed. */ | |
1792 | int num = cnt_bs (win32_oldpath.get_nt_native_path ()->Buffer + 4, c_old); | |
1793 | if (num < 1 /* locale drive. */ | |
2f4fef95 | 1794 | || (win32_oldpath.get_nt_native_path ()->Buffer[5] != L':' |
2566c2e6 CV |
1795 | && num < 3)) /* UNC path. */ |
1796 | { | |
1797 | /* 3a. No valid common path prefix: Create absolute symlink. */ | |
1798 | final_oldpath = win32_oldpath.get_nt_native_path (); | |
2566c2e6 CV |
1799 | } |
1800 | else | |
1801 | { | |
1802 | /* 3b. Common path prefx. Count number of additional directories | |
1803 | in symlink's path, and prepend as much ".." path components | |
1804 | to the target path. */ | |
1805 | PWCHAR e_new = win32_newpath.get_nt_native_path ()->Buffer | |
1806 | + win32_newpath.get_nt_native_path ()->Length | |
1807 | / sizeof (WCHAR); | |
1808 | num = cnt_bs (c_new, e_new); | |
1809 | final_oldpath = &final_oldpath_buf; | |
1810 | final_oldpath->Buffer = tp.w_get (); | |
1811 | PWCHAR e_old = final_oldpath->Buffer; | |
1812 | while (num-- > 0) | |
1813 | e_old = wcpcpy (e_old, L"..\\"); | |
1814 | wcpcpy (e_old, c_old); | |
1815 | } | |
9ecd475c | 1816 | } |
33cb946e CV |
1817 | /* If the symlink target doesn't exist, don't create native symlink. |
1818 | Otherwise the directory flag in the symlink is potentially wrong | |
1819 | when the target comes into existence, and native tools will fail. | |
1820 | This is so screwball. This is no problem on AFS, fortunately. */ | |
1821 | if (!win32_oldpath.exists () && !win32_oldpath.fs_is_afs ()) | |
1822 | { | |
1823 | SetLastError (ERROR_FILE_NOT_FOUND); | |
1824 | return -1; | |
1825 | } | |
8cdd7bad CV |
1826 | /* Don't allow native symlinks to Cygwin special files. However, the |
1827 | caller shoud know because this case shouldn't be covered by the | |
1828 | default "nativestrict" behaviour, so we use a special return code. */ | |
1829 | if (win32_oldpath.isspecial ()) | |
1830 | return -2; | |
7630387c | 1831 | /* Convert native paths to Win32 UNC paths. */ |
9ecd475c | 1832 | final_newpath = win32_newpath.get_nt_native_path (); |
9ecd475c | 1833 | final_newpath->Buffer[1] = L'\\'; |
7630387c CV |
1834 | /* oldpath may be relative. Make sure to convert only absolute paths |
1835 | to Win32 paths. */ | |
1836 | if (final_oldpath->Buffer[0] == L'\\') | |
1837 | { | |
11b7f942 CV |
1838 | /* Starting with Windows 8.1, the ShellExecuteW function does not |
1839 | handle the long path prefix correctly for symlink targets. Thus, | |
1840 | we create simple short paths < MAX_PATH without long path prefix. */ | |
7630387c CV |
1841 | if (RtlEqualUnicodePathPrefix (final_oldpath, &ro_u_uncp, TRUE) |
1842 | && final_oldpath->Length < (MAX_PATH + 6) * sizeof (WCHAR)) | |
1843 | { | |
1844 | final_oldpath->Buffer += 6; | |
1845 | final_oldpath->Buffer[0] = L'\\'; | |
1846 | } | |
1847 | else if (final_oldpath->Length < (MAX_PATH + 4) * sizeof (WCHAR)) | |
1848 | final_oldpath->Buffer += 4; | |
1849 | else /* Stick to long path, fix native prefix for Win32 API calls. */ | |
1850 | final_oldpath->Buffer[1] = L'\\'; | |
1851 | } | |
33cb946e | 1852 | /* Try to create native symlink. */ |
ffcfbf4b CV |
1853 | flags = win32_oldpath.isdir () ? SYMBOLIC_LINK_FLAG_DIRECTORY : 0; |
1854 | if (wincap.has_unprivileged_createsymlink ()) | |
1855 | flags |= SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE; | |
9ecd475c | 1856 | if (!CreateSymbolicLinkW (final_newpath->Buffer, final_oldpath->Buffer, |
ffcfbf4b | 1857 | flags)) |
9ecd475c | 1858 | { |
7630387c | 1859 | /* Repair native newpath, we still need it. */ |
9ecd475c CV |
1860 | final_newpath->Buffer[1] = L'?'; |
1861 | return -1; | |
1862 | } | |
1863 | return 0; | |
1870c688 CV |
1864 | } |
1865 | ||
44da5e4b CV |
1866 | #ifndef IO_REPARSE_TAG_LX_SYMLINK |
1867 | #define IO_REPARSE_TAG_LX_SYMLINK (0xa000001d) | |
1868 | #endif | |
1869 | ||
1870 | typedef struct _REPARSE_LX_SYMLINK_BUFFER | |
1871 | { | |
1872 | DWORD ReparseTag; | |
1873 | WORD ReparseDataLength; | |
1874 | WORD Reserved; | |
1875 | struct { | |
1876 | DWORD FileType; /* Take member name with a grain of salt. Value is | |
1877 | apparently always 2 for symlinks. */ | |
1878 | char PathBuffer[1];/* POSIX path as given to symlink(2). | |
1879 | Path is not \0 terminated. | |
1880 | Length is ReparseDataLength - sizeof (FileType). | |
1881 | Always UTF-8. | |
1882 | Chars given in incompatible codesets, e. g. umlauts | |
1883 | in ISO-8859-x, are converted to the Unicode | |
1884 | REPLACEMENT CHARACTER 0xfffd == \xef\xbf\bd */ | |
1885 | } LxSymlinkReparseBuffer; | |
1886 | } REPARSE_LX_SYMLINK_BUFFER,*PREPARSE_LX_SYMLINK_BUFFER; | |
1887 | ||
1888 | static int | |
1889 | symlink_wsl (const char *oldpath, path_conv &win32_newpath) | |
1890 | { | |
1891 | tmp_pathbuf tp; | |
1892 | PREPARSE_LX_SYMLINK_BUFFER rpl = (PREPARSE_LX_SYMLINK_BUFFER) tp.c_get (); | |
1893 | char *path_buf = rpl->LxSymlinkReparseBuffer.PathBuffer; | |
1894 | const int max_pathlen = MAXIMUM_REPARSE_DATA_BUFFER_SIZE | |
1895 | - offsetof (REPARSE_LX_SYMLINK_BUFFER, | |
1896 | LxSymlinkReparseBuffer.PathBuffer); | |
1897 | PWCHAR utf16 = tp.w_get (); | |
1898 | NTSTATUS status; | |
1899 | IO_STATUS_BLOCK io; | |
1900 | OBJECT_ATTRIBUTES attr; | |
1901 | HANDLE fh; | |
1902 | int len; | |
1903 | ||
1904 | rpl->ReparseTag = IO_REPARSE_TAG_LX_SYMLINK; | |
1905 | rpl->Reserved = 0; | |
1906 | rpl->LxSymlinkReparseBuffer.FileType = 2; | |
6b979620 CV |
1907 | /* Convert cygdrive prefix to "/mnt" for WSL compatibility, but only if |
1908 | cygdrive prefix is not "/", otherwise suffer random "/mnt" symlinks... */ | |
1909 | if (mount_table->cygdrive_len > 1 | |
1910 | && path_prefix_p (mount_table->cygdrive, oldpath, | |
1911 | mount_table->cygdrive_len, false)) | |
44da5e4b CV |
1912 | stpcpy (stpcpy (path_buf, "/mnt"), |
1913 | oldpath + mount_table->cygdrive_len - 1); | |
1914 | else | |
1915 | *stpncpy (path_buf, oldpath, max_pathlen) = '\0'; | |
1916 | /* Convert target path to UTF-16 and then back to UTF-8 to make sure the | |
6b979620 | 1917 | WSL symlink is in UTF-8, independent of the current Cygwin codeset. */ |
44da5e4b CV |
1918 | sys_mbstowcs (utf16, NT_MAX_PATH, path_buf); |
1919 | len = WideCharToMultiByte (CP_UTF8, 0, utf16, -1, path_buf, max_pathlen, | |
1920 | NULL, NULL); | |
1921 | /* Length is omitting trailing \0. */ | |
1922 | rpl->ReparseDataLength = sizeof (DWORD) + len - 1; | |
1923 | /* Create reparse point. */ | |
1924 | status = NtCreateFile (&fh, DELETE | FILE_GENERIC_WRITE | |
1925 | | READ_CONTROL | WRITE_DAC, | |
1926 | win32_newpath.get_object_attr (attr, sec_none_nih), | |
1927 | &io, NULL, FILE_ATTRIBUTE_NORMAL, | |
1928 | FILE_SHARE_VALID_FLAGS, FILE_CREATE, | |
1929 | FILE_SYNCHRONOUS_IO_NONALERT | |
1930 | | FILE_NON_DIRECTORY_FILE | |
1931 | | FILE_OPEN_FOR_BACKUP_INTENT | |
1932 | | FILE_OPEN_REPARSE_POINT, | |
1933 | NULL, 0); | |
1934 | if (!NT_SUCCESS (status)) | |
1935 | { | |
1936 | SetLastError (RtlNtStatusToDosError (status)); | |
1937 | return -1; | |
1938 | } | |
1939 | set_created_file_access (fh, win32_newpath, S_IFLNK | STD_RBITS | STD_WBITS); | |
1940 | status = NtFsControlFile (fh, NULL, NULL, NULL, &io, FSCTL_SET_REPARSE_POINT, | |
1941 | (LPVOID) rpl, REPARSE_DATA_BUFFER_HEADER_SIZE | |
1942 | + rpl->ReparseDataLength, | |
1943 | NULL, 0); | |
1944 | if (!NT_SUCCESS (status)) | |
1945 | { | |
1946 | SetLastError (RtlNtStatusToDosError (status)); | |
1947 | FILE_DISPOSITION_INFORMATION fdi = { TRUE }; | |
1948 | status = NtSetInformationFile (fh, &io, &fdi, sizeof fdi, | |
1949 | FileDispositionInformation); | |
1950 | NtClose (fh); | |
1951 | if (!NT_SUCCESS (status)) | |
1952 | debug_printf ("Setting delete dispostion failed, status = %y", status); | |
1953 | return -1; | |
1954 | } | |
1955 | NtClose (fh); | |
1956 | return 0; | |
1957 | } | |
1958 | ||
1870c688 | 1959 | int |
4bfa93f1 | 1960 | symlink_worker (const char *oldpath, path_conv &win32_newpath, bool isdevice) |
1870c688 CV |
1961 | { |
1962 | int res = -1; | |
1963 | size_t len; | |
1870c688 | 1964 | char *buf, *cp; |
1870c688 | 1965 | tmp_pathbuf tp; |
9ecd475c | 1966 | winsym_t wsym_type; |
1870c688 CV |
1967 | |
1968 | /* POSIX says that empty 'newpath' is invalid input while empty | |
1969 | 'oldpath' is valid -- it's symlink resolver job to verify if | |
1970 | symlink contents point to existing filesystem object */ | |
3f3bd101 | 1971 | __try |
1870c688 | 1972 | { |
3f3bd101 CV |
1973 | if (strlen (oldpath) > SYMLINK_MAX) |
1974 | { | |
1975 | set_errno (ENAMETOOLONG); | |
1976 | __leave; | |
1977 | } | |
81adfe28 | 1978 | |
3f3bd101 CV |
1979 | /* Default symlink type is determined by global allow_winsymlinks |
1980 | variable. Device files are always shortcuts. */ | |
1981 | wsym_type = isdevice ? WSYM_lnk : allow_winsymlinks; | |
1982 | /* NFS has its own, dedicated way to create symlinks. */ | |
1983 | if (win32_newpath.fs_is_nfs ()) | |
1984 | wsym_type = WSYM_nfs; | |
1985 | /* MVFS doesn't handle the SYSTEM DOS attribute, but it handles the R/O | |
1986 | attribute. Therefore we create symlinks on MVFS always as shortcuts. */ | |
1987 | else if (win32_newpath.fs_is_mvfs ()) | |
1988 | wsym_type = WSYM_lnk; | |
1989 | /* AFS only supports native symlinks. */ | |
1990 | else if (win32_newpath.fs_is_afs ()) | |
67fd2101 | 1991 | wsym_type = WSYM_nativestrict; |
3f3bd101 CV |
1992 | /* Don't try native symlinks on FSes not supporting reparse points. */ |
1993 | else if ((wsym_type == WSYM_native || wsym_type == WSYM_nativestrict) | |
1994 | && !(win32_newpath.fs_flags () & FILE_SUPPORTS_REPARSE_POINTS)) | |
1995 | wsym_type = WSYM_sysfile; | |
1996 | ||
1997 | /* Attach .lnk suffix when shortcut is requested. */ | |
1998 | if (wsym_type == WSYM_lnk && !win32_newpath.exists () | |
1999 | && (isdevice || !win32_newpath.fs_is_nfs ())) | |
2000 | { | |
2001 | char *newplnk = tp.c_get (); | |
4bfa93f1 | 2002 | stpcpy (stpcpy (newplnk, win32_newpath.get_posix ()), ".lnk"); |
13bfb3c6 | 2003 | win32_newpath.check (newplnk, PC_SYM_NOFOLLOW | PC_POSIX); |
3f3bd101 | 2004 | } |
81adfe28 | 2005 | |
3f3bd101 | 2006 | if (win32_newpath.error) |
1870c688 | 2007 | { |
3f3bd101 CV |
2008 | set_errno (win32_newpath.error); |
2009 | __leave; | |
1870c688 | 2010 | } |
81adfe28 | 2011 | |
3f3bd101 CV |
2012 | syscall_printf ("symlink (%s, %S) wsym_type %d", oldpath, |
2013 | win32_newpath.get_nt_native_path (), wsym_type); | |
1870c688 | 2014 | |
3f3bd101 | 2015 | if ((!isdevice && win32_newpath.exists ()) |
fb5ce26c | 2016 | || (win32_newpath.isdevice () && !win32_newpath.is_fs_special ())) |
1870c688 | 2017 | { |
3f3bd101 CV |
2018 | set_errno (EEXIST); |
2019 | __leave; | |
2020 | } | |
1870c688 | 2021 | |
44da5e4b | 2022 | /* Handle NFS, native symlinks and WSL symlinks in their own functions. */ |
3f3bd101 CV |
2023 | switch (wsym_type) |
2024 | { | |
2025 | case WSYM_nfs: | |
2026 | res = symlink_nfs (oldpath, win32_newpath); | |
2027 | __leave; | |
2028 | case WSYM_native: | |
2029 | case WSYM_nativestrict: | |
2030 | res = symlink_native (oldpath, win32_newpath); | |
2031 | if (!res) | |
2032 | __leave; | |
8cdd7bad CV |
2033 | /* Strictly native? Too bad, unless the target is a Cygwin |
2034 | special file. */ | |
2035 | if (res == -1 && wsym_type == WSYM_nativestrict) | |
1870c688 | 2036 | { |
3f3bd101 CV |
2037 | __seterrno (); |
2038 | __leave; | |
1870c688 | 2039 | } |
3f3bd101 CV |
2040 | /* Otherwise, fall back to default symlink type. */ |
2041 | wsym_type = WSYM_sysfile; | |
50ad1980 | 2042 | fallthrough; |
44da5e4b CV |
2043 | case WSYM_sysfile: |
2044 | if (win32_newpath.fs_flags () & FILE_SUPPORTS_REPARSE_POINTS) | |
2045 | { | |
2046 | res = symlink_wsl (oldpath, win32_newpath); | |
2047 | if (!res) | |
2048 | __leave; | |
2049 | } | |
2050 | /* On FSes not supporting reparse points, or in case of an error | |
2051 | creating the WSL symlink, fall back to creating the plain old | |
2052 | SYSTEM file symlink. */ | |
3f3bd101 CV |
2053 | break; |
2054 | default: | |
2055 | break; | |
2056 | } | |
2057 | ||
2058 | if (wsym_type == WSYM_lnk) | |
2059 | { | |
2060 | path_conv win32_oldpath; | |
2061 | ITEMIDLIST *pidl = NULL; | |
2062 | size_t full_len = 0; | |
2063 | unsigned short oldpath_len, desc_len, relpath_len, pidl_len = 0; | |
2064 | char desc[MAX_PATH + 1], *relpath; | |
2065 | ||
2066 | if (!isdevice) | |
1870c688 | 2067 | { |
3f3bd101 CV |
2068 | /* First create an IDLIST to learn how big our shortcut is |
2069 | going to be. */ | |
2070 | IShellFolder *psl; | |
2071 | ||
2072 | /* The symlink target is relative to the directory in which the | |
2073 | symlink gets created, not relative to the cwd. Therefore we | |
2074 | have to mangle the path quite a bit before calling path_conv.*/ | |
2075 | if (isabspath (oldpath)) | |
2076 | win32_oldpath.check (oldpath, | |
2077 | PC_SYM_NOFOLLOW, | |
2078 | stat_suffixes); | |
2079 | else | |
2080 | { | |
d2bd82aa CV |
2081 | len = strrchr (win32_newpath.get_posix (), '/') |
2082 | - win32_newpath.get_posix () + 1; | |
3f3bd101 | 2083 | char *absoldpath = tp.t_get (); |
d2bd82aa | 2084 | stpcpy (stpncpy (absoldpath, win32_newpath.get_posix (), |
3f3bd101 CV |
2085 | len), |
2086 | oldpath); | |
2087 | win32_oldpath.check (absoldpath, PC_SYM_NOFOLLOW, | |
2088 | stat_suffixes); | |
2089 | } | |
2090 | if (SUCCEEDED (SHGetDesktopFolder (&psl))) | |
1870c688 | 2091 | { |
3f3bd101 CV |
2092 | WCHAR wc_path[win32_oldpath.get_wide_win32_path_len () + 1]; |
2093 | win32_oldpath.get_wide_win32_path (wc_path); | |
2094 | /* Amazing but true: Even though the ParseDisplayName method | |
2095 | takes a wide char path name, it does not understand the | |
2096 | Win32 prefix for long pathnames! So we have to tack off | |
2097 | the prefix and convert the path to the "normal" syntax | |
2098 | for ParseDisplayName. */ | |
3e80cefb | 2099 | PWCHAR wc = wc_path + 4; |
3f3bd101 CV |
2100 | if (wc[1] != L':') /* native UNC path */ |
2101 | *(wc += 2) = L'\\'; | |
2102 | HRESULT res; | |
2103 | if (SUCCEEDED (res = psl->ParseDisplayName (NULL, NULL, wc, | |
2104 | NULL, &pidl, | |
2105 | NULL))) | |
2106 | { | |
2107 | ITEMIDLIST *p; | |
81adfe28 | 2108 | |
3f3bd101 CV |
2109 | for (p = pidl; p->mkid.cb > 0; |
2110 | p = (ITEMIDLIST *)((char *) p + p->mkid.cb)) | |
2111 | ; | |
2112 | pidl_len = (char *) p - (char *) pidl + 2; | |
2113 | } | |
2114 | psl->Release (); | |
1870c688 | 2115 | } |
1870c688 | 2116 | } |
3f3bd101 CV |
2117 | /* Compute size of shortcut file. */ |
2118 | full_len = sizeof (win_shortcut_hdr); | |
2119 | if (pidl_len) | |
2120 | full_len += sizeof (unsigned short) + pidl_len; | |
2121 | oldpath_len = strlen (oldpath); | |
2122 | /* Unfortunately the length of the description is restricted to a | |
2123 | length of 2000 bytes. We don't want to add considerations for | |
2124 | the different lengths and even 2000 bytes is not enough for long | |
2125 | path names. So what we do here is to set the description to the | |
2126 | POSIX path only if the path is not longer than MAX_PATH characters. | |
2127 | We append the full path name after the regular shortcut data | |
2128 | (see below), which works fine with Windows Explorer as well | |
2129 | as older Cygwin versions (as long as the whole file isn't bigger | |
2130 | than 8K). The description field is only used for backward | |
2131 | compatibility to older Cygwin versions and those versions are | |
2132 | not capable of handling long path names anyway. */ | |
2133 | desc_len = stpcpy (desc, oldpath_len > MAX_PATH | |
2134 | ? "[path too long]" : oldpath) - desc; | |
2135 | full_len += sizeof (unsigned short) + desc_len; | |
2136 | /* Devices get the oldpath string unchanged as relative path. */ | |
2137 | if (isdevice) | |
2138 | { | |
2139 | relpath_len = oldpath_len; | |
2140 | stpcpy (relpath = tp.c_get (), oldpath); | |
2141 | } | |
2142 | else | |
2143 | { | |
2144 | relpath_len = strlen (win32_oldpath.get_win32 ()); | |
2145 | stpcpy (relpath = tp.c_get (), win32_oldpath.get_win32 ()); | |
2146 | } | |
2147 | full_len += sizeof (unsigned short) + relpath_len; | |
2148 | full_len += sizeof (unsigned short) + oldpath_len; | |
2149 | /* 1 byte more for trailing 0 written by stpcpy. */ | |
2150 | if (full_len < NT_MAX_PATH * sizeof (WCHAR)) | |
2151 | buf = tp.t_get (); | |
2152 | else | |
2153 | buf = (char *) alloca (full_len + 1); | |
2154 | ||
2155 | /* Create shortcut header */ | |
2156 | win_shortcut_hdr *shortcut_header = (win_shortcut_hdr *) buf; | |
2157 | memset (shortcut_header, 0, sizeof *shortcut_header); | |
2158 | shortcut_header->size = sizeof *shortcut_header; | |
2159 | shortcut_header->magic = GUID_shortcut; | |
2160 | shortcut_header->flags = (WSH_FLAG_DESC | WSH_FLAG_RELPATH); | |
2161 | if (pidl) | |
2162 | shortcut_header->flags |= WSH_FLAG_IDLIST; | |
2163 | shortcut_header->run = SW_NORMAL; | |
2164 | cp = buf + sizeof (win_shortcut_hdr); | |
2165 | ||
2166 | /* Create IDLIST */ | |
2167 | if (pidl) | |
2168 | { | |
2169 | *(unsigned short *)cp = pidl_len; | |
2170 | memcpy (cp += 2, pidl, pidl_len); | |
2171 | cp += pidl_len; | |
2172 | CoTaskMemFree (pidl); | |
2173 | } | |
2174 | ||
2175 | /* Create description */ | |
2176 | *(unsigned short *)cp = desc_len; | |
2177 | cp = stpcpy (cp += 2, desc); | |
2178 | ||
2179 | /* Create relpath */ | |
2180 | *(unsigned short *)cp = relpath_len; | |
2181 | cp = stpcpy (cp += 2, relpath); | |
2182 | ||
2183 | /* Append the POSIX path after the regular shortcut data for | |
2184 | the long path support. */ | |
2185 | unsigned short *plen = (unsigned short *) cp; | |
2186 | cp += 2; | |
2187 | *(PWCHAR) cp = 0xfeff; /* BOM */ | |
2188 | cp += 2; | |
2189 | *plen = sys_mbstowcs ((PWCHAR) cp, NT_MAX_PATH, oldpath) | |
2190 | * sizeof (WCHAR); | |
2191 | cp += *plen; | |
1870c688 CV |
2192 | } |
2193 | else | |
2194 | { | |
3f3bd101 CV |
2195 | /* Default technique creating a symlink. */ |
2196 | buf = tp.t_get (); | |
2197 | cp = stpcpy (buf, SYMLINK_COOKIE); | |
2198 | *(PWCHAR) cp = 0xfeff; /* BOM */ | |
2199 | cp += 2; | |
2200 | /* Note that the terminating nul is written. */ | |
2201 | cp += sys_mbstowcs ((PWCHAR) cp, NT_MAX_PATH, oldpath) | |
2202 | * sizeof (WCHAR); | |
1870c688 | 2203 | } |
81adfe28 | 2204 | |
3f3bd101 CV |
2205 | OBJECT_ATTRIBUTES attr; |
2206 | IO_STATUS_BLOCK io; | |
2207 | NTSTATUS status; | |
2208 | ULONG access; | |
2209 | HANDLE fh; | |
9ecd475c | 2210 | |
3f3bd101 CV |
2211 | access = DELETE | FILE_GENERIC_WRITE; |
2212 | if (isdevice && win32_newpath.exists ()) | |
2213 | { | |
2214 | status = NtOpenFile (&fh, FILE_WRITE_ATTRIBUTES, | |
2215 | win32_newpath.get_object_attr (attr, | |
2216 | sec_none_nih), | |
2217 | &io, 0, FILE_OPEN_FOR_BACKUP_INTENT); | |
2218 | if (!NT_SUCCESS (status)) | |
2219 | { | |
2220 | __seterrno_from_nt_status (status); | |
2221 | __leave; | |
2222 | } | |
2223 | status = NtSetAttributesFile (fh, FILE_ATTRIBUTE_NORMAL); | |
2224 | NtClose (fh); | |
2225 | if (!NT_SUCCESS (status)) | |
2226 | { | |
2227 | __seterrno_from_nt_status (status); | |
2228 | __leave; | |
2229 | } | |
2230 | } | |
2231 | else if (!isdevice && win32_newpath.has_acls () | |
2232 | && !win32_newpath.isremote ()) | |
2233 | /* If the filesystem supports ACLs, we will overwrite the DACL after the | |
2234 | call to NtCreateFile. This requires a handle with READ_CONTROL and | |
2235 | WRITE_DAC access, otherwise get_file_sd and set_file_sd both have to | |
2236 | open the file again. | |
2237 | FIXME: On remote NTFS shares open sometimes fails because even the | |
2238 | creator of the file doesn't have the right to change the DACL. | |
2239 | I don't know what setting that is or how to recognize such a share, | |
2240 | so for now we don't request WRITE_DAC on remote drives. */ | |
2241 | access |= READ_CONTROL | WRITE_DAC; | |
2242 | ||
2243 | status = NtCreateFile (&fh, access, | |
2244 | win32_newpath.get_object_attr (attr, sec_none_nih), | |
2245 | &io, NULL, FILE_ATTRIBUTE_NORMAL, | |
2246 | FILE_SHARE_VALID_FLAGS, | |
2247 | isdevice ? FILE_OVERWRITE_IF : FILE_CREATE, | |
2248 | FILE_SYNCHRONOUS_IO_NONALERT | |
2249 | | FILE_NON_DIRECTORY_FILE | |
2250 | | FILE_OPEN_FOR_BACKUP_INTENT, | |
2251 | NULL, 0); | |
1870c688 CV |
2252 | if (!NT_SUCCESS (status)) |
2253 | { | |
2254 | __seterrno_from_nt_status (status); | |
3f3bd101 | 2255 | __leave; |
1870c688 | 2256 | } |
bc444e5a CV |
2257 | if (io.Information == FILE_CREATED && win32_newpath.has_acls ()) |
2258 | set_created_file_access (fh, win32_newpath, | |
2259 | S_IFLNK | STD_RBITS | STD_WBITS); | |
3f3bd101 CV |
2260 | status = NtWriteFile (fh, NULL, NULL, NULL, &io, buf, cp - buf, |
2261 | NULL, NULL); | |
2262 | if (NT_SUCCESS (status) && io.Information == (ULONG) (cp - buf)) | |
2263 | { | |
2264 | status = NtSetAttributesFile (fh, wsym_type == WSYM_lnk | |
2265 | ? FILE_ATTRIBUTE_READONLY | |
2266 | : FILE_ATTRIBUTE_SYSTEM); | |
2267 | if (!NT_SUCCESS (status)) | |
2268 | debug_printf ("Setting attributes failed, status = %y", status); | |
2269 | res = 0; | |
2270 | } | |
2271 | else | |
1870c688 CV |
2272 | { |
2273 | __seterrno_from_nt_status (status); | |
3f3bd101 CV |
2274 | FILE_DISPOSITION_INFORMATION fdi = { TRUE }; |
2275 | status = NtSetInformationFile (fh, &io, &fdi, sizeof fdi, | |
2276 | FileDispositionInformation); | |
2277 | if (!NT_SUCCESS (status)) | |
2278 | debug_printf ("Setting delete dispostion failed, status = %y", | |
2279 | status); | |
1870c688 | 2280 | } |
3f3bd101 | 2281 | NtClose (fh); |
69d7815e | 2282 | |
1870c688 | 2283 | } |
3f3bd101 CV |
2284 | __except (EFAULT) {} |
2285 | __endtry | |
9ecd475c | 2286 | syscall_printf ("%d = symlink_worker(%s, %s, %d)", |
4bfa93f1 | 2287 | res, oldpath, win32_newpath.get_posix (), isdevice); |
1870c688 CV |
2288 | return res; |
2289 | } | |
2290 | ||
2291 | static bool | |
2292 | cmp_shortcut_header (win_shortcut_hdr *file_header) | |
2293 | { | |
2294 | /* A Cygwin or U/Win shortcut only contains a description and a relpath. | |
2295 | Cygwin shortcuts also might contain an ITEMIDLIST. The run type is | |
2296 | always set to SW_NORMAL. */ | |
2297 | return file_header->size == sizeof (win_shortcut_hdr) | |
2298 | && !memcmp (&file_header->magic, &GUID_shortcut, sizeof GUID_shortcut) | |
2299 | && (file_header->flags & ~WSH_FLAG_IDLIST) | |
2300 | == (WSH_FLAG_DESC | WSH_FLAG_RELPATH) | |
2301 | && file_header->run == SW_NORMAL; | |
2302 | } | |
2303 | ||
2304 | int | |
5a0d1edb | 2305 | symlink_info::check_shortcut (HANDLE h) |
1870c688 CV |
2306 | { |
2307 | tmp_pathbuf tp; | |
2308 | win_shortcut_hdr *file_header; | |
2309 | char *buf, *cp; | |
2310 | unsigned short len; | |
2311 | int res = 0; | |
1870c688 | 2312 | NTSTATUS status; |
1870c688 CV |
2313 | IO_STATUS_BLOCK io; |
2314 | FILE_STANDARD_INFORMATION fsi; | |
5a0d1edb | 2315 | LARGE_INTEGER off = { QuadPart:0LL }; |
1870c688 | 2316 | |
1870c688 CV |
2317 | status = NtQueryInformationFile (h, &io, &fsi, sizeof fsi, |
2318 | FileStandardInformation); | |
2319 | if (!NT_SUCCESS (status)) | |
2320 | { | |
2321 | set_error (EIO); | |
5a0d1edb | 2322 | return 0; |
1870c688 | 2323 | } |
61522196 | 2324 | if (fsi.EndOfFile.QuadPart <= (LONGLONG) sizeof (win_shortcut_hdr) |
1870c688 | 2325 | || fsi.EndOfFile.QuadPart > 4 * 65536) |
5a0d1edb | 2326 | return 0; |
1870c688 CV |
2327 | if (fsi.EndOfFile.LowPart < NT_MAX_PATH * sizeof (WCHAR)) |
2328 | buf = (char *) tp.w_get (); | |
2329 | else | |
2330 | buf = (char *) alloca (fsi.EndOfFile.LowPart + 1); | |
5a0d1edb CV |
2331 | status = NtReadFile (h, NULL, NULL, NULL, &io, buf, fsi.EndOfFile.LowPart, |
2332 | &off, NULL); | |
5a0d1edb | 2333 | if (!NT_SUCCESS (status)) |
1870c688 | 2334 | { |
5a0d1edb CV |
2335 | if (status != STATUS_END_OF_FILE) |
2336 | set_error (EIO); | |
2337 | return 0; | |
1870c688 CV |
2338 | } |
2339 | file_header = (win_shortcut_hdr *) buf; | |
2340 | if (io.Information != fsi.EndOfFile.LowPart | |
2341 | || !cmp_shortcut_header (file_header)) | |
5a0d1edb | 2342 | return 0; |
1870c688 CV |
2343 | cp = buf + sizeof (win_shortcut_hdr); |
2344 | if (file_header->flags & WSH_FLAG_IDLIST) /* Skip ITEMIDLIST */ | |
2345 | cp += *(unsigned short *) cp + 2; | |
2346 | if (!(len = *(unsigned short *) cp)) | |
5a0d1edb | 2347 | return 0; |
1870c688 CV |
2348 | cp += 2; |
2349 | /* Check if this is a device file - these start with the sequence :\\ */ | |
2350 | if (strncmp (cp, ":\\", 2) == 0) | |
2351 | res = strlen (strcpy (contents, cp)); /* Don't mess with device files */ | |
2352 | else | |
2353 | { | |
2354 | /* Has appended full path? If so, use it instead of description. */ | |
2355 | unsigned short relpath_len = *(unsigned short *) (cp + len); | |
2356 | if (cp + len + 2 + relpath_len < buf + fsi.EndOfFile.LowPart) | |
2357 | { | |
2358 | cp += len + 2 + relpath_len; | |
2359 | len = *(unsigned short *) cp; | |
2360 | cp += 2; | |
2361 | } | |
4d9c7280 CV |
2362 | if (*(PWCHAR) cp == 0xfeff) /* BOM */ |
2363 | { | |
2364 | char *tmpbuf = tp.c_get (); | |
2365 | if (sys_wcstombs (tmpbuf, NT_MAX_PATH, (PWCHAR) (cp + 2)) | |
ef750173 | 2366 | > SYMLINK_MAX) |
5a0d1edb | 2367 | return 0; |
4d9c7280 CV |
2368 | res = posixify (tmpbuf); |
2369 | } | |
2370 | else if (len > SYMLINK_MAX) | |
5a0d1edb | 2371 | return 0; |
4d9c7280 CV |
2372 | else |
2373 | { | |
2374 | cp[len] = '\0'; | |
2375 | res = posixify (cp); | |
2376 | } | |
1870c688 CV |
2377 | } |
2378 | if (res) /* It's a symlink. */ | |
c1023ee3 | 2379 | path_flags |= PATH_SYMLINK | PATH_LNK; |
58402a3f | 2380 | return res; |
1870c688 CV |
2381 | } |
2382 | ||
2383 | int | |
5a0d1edb | 2384 | symlink_info::check_sysfile (HANDLE h) |
1870c688 | 2385 | { |
4d9c7280 | 2386 | tmp_pathbuf tp; |
1870c688 | 2387 | char cookie_buf[sizeof (SYMLINK_COOKIE) - 1]; |
4d9c7280 | 2388 | char *srcbuf = tp.c_get (); |
1870c688 | 2389 | int res = 0; |
1870c688 | 2390 | NTSTATUS status; |
1870c688 | 2391 | IO_STATUS_BLOCK io; |
2671595b | 2392 | bool interix_symlink = false; |
5a0d1edb | 2393 | LARGE_INTEGER off = { QuadPart:0LL }; |
1870c688 | 2394 | |
5a0d1edb CV |
2395 | status = NtReadFile (h, NULL, NULL, NULL, &io, cookie_buf, |
2396 | sizeof (cookie_buf), &off, NULL); | |
1870c688 | 2397 | if (!NT_SUCCESS (status)) |
1870c688 | 2398 | { |
61522196 | 2399 | debug_printf ("ReadFile1 failed %y", status); |
1870c688 | 2400 | if (status != STATUS_END_OF_FILE) |
81adfe28 | 2401 | set_error (EIO); |
5a0d1edb | 2402 | return 0; |
1870c688 | 2403 | } |
5a0d1edb CV |
2404 | off.QuadPart = io.Information; |
2405 | if (io.Information == sizeof (cookie_buf) | |
1870c688 CV |
2406 | && memcmp (cookie_buf, SYMLINK_COOKIE, sizeof (cookie_buf)) == 0) |
2407 | { | |
2408 | /* It's a symlink. */ | |
c1023ee3 | 2409 | path_flags |= PATH_SYMLINK; |
2671595b CV |
2410 | } |
2411 | else if (io.Information == sizeof (cookie_buf) | |
2412 | && memcmp (cookie_buf, SOCKET_COOKIE, sizeof (cookie_buf)) == 0) | |
c1023ee3 | 2413 | path_flags |= PATH_SOCKET; |
2671595b CV |
2414 | else if (io.Information >= sizeof (INTERIX_SYMLINK_COOKIE) |
2415 | && memcmp (cookie_buf, INTERIX_SYMLINK_COOKIE, | |
2416 | sizeof (INTERIX_SYMLINK_COOKIE) - 1) == 0) | |
2417 | { | |
2418 | /* It's an Interix symlink. */ | |
c1023ee3 | 2419 | path_flags |= PATH_SYMLINK; |
2671595b CV |
2420 | interix_symlink = true; |
2421 | /* Interix symlink cookies are shorter than Cygwin symlink cookies, so | |
b86f999a | 2422 | in case of an Interix symlink cooky we have read too far into the |
2671595b | 2423 | file. Set file pointer back to the position right after the cookie. */ |
5a0d1edb | 2424 | off.QuadPart = sizeof (INTERIX_SYMLINK_COOKIE) - 1; |
2671595b | 2425 | } |
c1023ee3 | 2426 | if (path_flags & PATH_SYMLINK) |
2671595b | 2427 | { |
1870c688 | 2428 | status = NtReadFile (h, NULL, NULL, NULL, &io, srcbuf, |
5a0d1edb | 2429 | NT_MAX_PATH, &off, NULL); |
1870c688 CV |
2430 | if (!NT_SUCCESS (status)) |
2431 | { | |
2432 | debug_printf ("ReadFile2 failed"); | |
2433 | if (status != STATUS_END_OF_FILE) | |
2434 | set_error (EIO); | |
2435 | } | |
d2ef2331 | 2436 | else if (*(PWCHAR) srcbuf == 0xfeff /* BOM */ |
2671595b | 2437 | || interix_symlink) |
4d9c7280 | 2438 | { |
2671595b CV |
2439 | /* Add trailing 0 to Interix symlink target. Skip BOM in Cygwin |
2440 | symlinks. */ | |
2441 | if (interix_symlink) | |
2442 | ((PWCHAR) srcbuf)[io.Information / sizeof (WCHAR)] = L'\0'; | |
2443 | else | |
2444 | srcbuf += 2; | |
4d9c7280 | 2445 | char *tmpbuf = tp.c_get (); |
2671595b | 2446 | if (sys_wcstombs (tmpbuf, NT_MAX_PATH, (PWCHAR) srcbuf) |
ef750173 | 2447 | > SYMLINK_MAX) |
4d9c7280 CV |
2448 | debug_printf ("symlink string too long"); |
2449 | else | |
2450 | res = posixify (tmpbuf); | |
2451 | } | |
1870c688 CV |
2452 | else if (io.Information > SYMLINK_MAX + 1) |
2453 | debug_printf ("symlink string too long"); | |
2454 | else | |
2455 | res = posixify (srcbuf); | |
2456 | } | |
1870c688 CV |
2457 | return res; |
2458 | } | |
2459 | ||
3e80cefb CV |
2460 | static bool |
2461 | check_reparse_point_string (PUNICODE_STRING subst) | |
7a4e299a J |
2462 | { |
2463 | /* Native mount points, or native non-relative symbolic links, | |
2464 | can be treated as posix symlinks only if the SubstituteName | |
2465 | can be converted from a native NT object namespace name to | |
2466 | a win32 name. We only know how to convert names with two | |
2467 | prefixes : | |
2468 | "\??\UNC\..." | |
2469 | "\??\X:..." | |
2470 | Other reparse points will be treated as files or | |
2471 | directories, not as posix symlinks. | |
2472 | */ | |
2473 | if (RtlEqualUnicodePathPrefix (subst, &ro_u_natp, FALSE)) | |
2474 | { | |
42f1be58 CV |
2475 | if (subst->Length >= 6 * sizeof(WCHAR) && subst->Buffer[5] == L':' && |
2476 | (subst->Length == 6 * sizeof(WCHAR) || subst->Buffer[6] == L'\\')) | |
7a4e299a | 2477 | return true; |
42f1be58 | 2478 | else if (subst->Length >= 8 * sizeof(WCHAR) && |
7a4e299a J |
2479 | wcsncmp (subst->Buffer + 4, L"UNC\\", 4) == 0) |
2480 | return true; | |
2481 | } | |
2482 | return false; | |
2483 | } | |
2484 | ||
3e80cefb CV |
2485 | /* Return values: |
2486 | <0: Negative errno. | |
6b6dd5fe | 2487 | 0: Not a reparse point recognized by us. |
0e290489 | 2488 | >0: Path flags for a recognized reparse point, always including PATH_REP. |
3e80cefb | 2489 | */ |
1870c688 | 2490 | int |
3e80cefb CV |
2491 | check_reparse_point_target (HANDLE h, bool remote, PREPARSE_DATA_BUFFER rp, |
2492 | PUNICODE_STRING psymbuf) | |
1870c688 | 2493 | { |
1870c688 CV |
2494 | NTSTATUS status; |
2495 | IO_STATUS_BLOCK io; | |
1870c688 | 2496 | |
855ea3fd CV |
2497 | /* On remote drives or under heavy load, NtFsControlFile can return with |
2498 | STATUS_PENDING. If so, instead of creating an event object, just set | |
2499 | io.Status to an invalid value and perform a minimal wait until io.Status | |
2500 | changed. */ | |
2501 | memset (&io, 0xff, sizeof io); | |
2502 | status = NtFsControlFile (h, NULL, NULL, NULL, &io, | |
2503 | FSCTL_GET_REPARSE_POINT, NULL, 0, (LPVOID) rp, | |
1870c688 | 2504 | MAXIMUM_REPARSE_DATA_BUFFER_SIZE); |
855ea3fd CV |
2505 | if (status == STATUS_PENDING) |
2506 | { | |
2507 | while (io.Status == (NTSTATUS) 0xffffffff) | |
d2ef2331 | 2508 | Sleep (1L); |
855ea3fd CV |
2509 | status = io.Status; |
2510 | } | |
1870c688 CV |
2511 | if (!NT_SUCCESS (status)) |
2512 | { | |
61522196 | 2513 | debug_printf ("NtFsControlFile(FSCTL_GET_REPARSE_POINT) failed, %y", |
1870c688 | 2514 | status); |
713161b2 CV |
2515 | /* When accessing the root dir of some remote drives (observed with |
2516 | OS X shares), the FILE_ATTRIBUTE_REPARSE_POINT flag is set, but | |
2517 | the followup call to NtFsControlFile(FSCTL_GET_REPARSE_POINT) | |
2518 | returns with STATUS_NOT_A_REPARSE_POINT. That's quite buggy, but | |
2519 | we cope here with this scenario by not setting an error code. */ | |
3e80cefb CV |
2520 | if (status == STATUS_NOT_A_REPARSE_POINT) |
2521 | return 0; | |
2522 | return -EIO; | |
1870c688 CV |
2523 | } |
2524 | if (rp->ReparseTag == IO_REPARSE_TAG_SYMLINK) | |
7a4e299a J |
2525 | { |
2526 | /* Windows evaluates native symlink literally. If a remote symlink points | |
2527 | to, say, C:\foo, it will be handled as if the target is the local file | |
2528 | C:\foo. That comes in handy since that's how symlinks are treated under | |
2529 | POSIX as well. */ | |
3e80cefb CV |
2530 | RtlInitCountedUnicodeString (psymbuf, |
2531 | (PWCHAR)((PBYTE) rp->SymbolicLinkReparseBuffer.PathBuffer | |
2532 | + rp->SymbolicLinkReparseBuffer.SubstituteNameOffset), | |
2533 | rp->SymbolicLinkReparseBuffer.SubstituteNameLength); | |
2534 | if ((rp->SymbolicLinkReparseBuffer.Flags & SYMLINK_FLAG_RELATIVE) || | |
2535 | check_reparse_point_string (psymbuf)) | |
aa467e6e | 2536 | return PATH_SYMLINK | PATH_REP; |
7a4e299a | 2537 | } |
855ea3fd | 2538 | else if (!remote && rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT) |
1870c688 | 2539 | { |
73d3f9cf CV |
2540 | /* Don't handle junctions on remote filesystems as symlinks. This type |
2541 | of reparse point is handled transparently by the OS so that the | |
2542 | target of the junction is the remote directory it is supposed to | |
2543 | point to. If we handle it as symlink, it will be mistreated as | |
2544 | pointing to a dir on the local system. */ | |
3e80cefb CV |
2545 | RtlInitCountedUnicodeString (psymbuf, |
2546 | (PWCHAR)((PBYTE) rp->MountPointReparseBuffer.PathBuffer | |
2547 | + rp->MountPointReparseBuffer.SubstituteNameOffset), | |
11788f8c | 2548 | rp->MountPointReparseBuffer.SubstituteNameLength); |
3e80cefb | 2549 | if (RtlEqualUnicodePathPrefix (psymbuf, &ro_u_volume, TRUE)) |
73d3f9cf | 2550 | { |
3e80cefb CV |
2551 | /* Volume mount point. Not treated as symlink. The return |
2552 | value -EPERM is a hint for the caller to treat this as a | |
2553 | volume mount point. */ | |
2554 | return -EPERM; | |
73d3f9cf | 2555 | } |
3e80cefb | 2556 | if (check_reparse_point_string (psymbuf)) |
aa467e6e CV |
2557 | return PATH_SYMLINK | PATH_REP; |
2558 | } | |
4a36897a CV |
2559 | else if (rp->ReparseTag == IO_REPARSE_TAG_LX_SYMLINK) |
2560 | { | |
2561 | /* WSL symlink. Problem: We have to convert the path to UTF-16 for | |
2562 | the caller. Reparse points are 16K max. The buffer given to rp | |
2563 | is 32K. So there's enough trailing space in the buffer to convert | |
2564 | to UTF-16 and let psymbuf point to it. */ | |
2565 | PREPARSE_LX_SYMLINK_BUFFER rpl = (PREPARSE_LX_SYMLINK_BUFFER) rp; | |
2566 | char *path_buf = rpl->LxSymlinkReparseBuffer.PathBuffer; | |
2567 | DWORD path_len = rpl->ReparseDataLength - sizeof (DWORD); | |
fb834bee CV |
2568 | bool full_path = false; |
2569 | const size_t drv_prefix_len = strlen ("/mnt"); | |
4a36897a CV |
2570 | PBYTE utf16_ptr; |
2571 | PWCHAR utf16_buf; | |
2572 | int utf16_bufsize; | |
4a36897a | 2573 | |
fb834bee CV |
2574 | /* 0-terminate path_buf for easier testing. */ |
2575 | path_buf[path_len] = '\0'; | |
2576 | if (path_prefix_p ("/mnt", path_buf, drv_prefix_len, false)) | |
2577 | { | |
2578 | size_t len = strlen (path_buf); | |
2579 | ||
2580 | if (len <= drv_prefix_len + 1) | |
2581 | { | |
2582 | /* /mnt or /mnt/. Replace with cygdrive prefix. */ | |
2583 | stpcpy (path_buf, mount_table->cygdrive); | |
2584 | path_len = mount_table->cygdrive_len; | |
2585 | if (len == drv_prefix_len) | |
2586 | { | |
2587 | path_buf[mount_table->cygdrive_len - 1] = '\0'; | |
2588 | --path_len; | |
2589 | } | |
2590 | rp->ReparseDataLength = path_len + sizeof (DWORD); | |
2591 | } | |
2592 | else if (islower (path_buf[drv_prefix_len + 1]) | |
2593 | && (path_len == drv_prefix_len + 2 | |
2594 | || path_buf[drv_prefix_len + 2] == '/')) | |
2595 | { | |
2596 | /* Skip forward to the slash leading the drive letter. | |
2597 | That leaves room for adding the colon. */ | |
2598 | path_buf += drv_prefix_len; | |
2599 | path_len -= drv_prefix_len; | |
2600 | full_path = true; | |
2601 | } | |
2602 | } | |
4a36897a CV |
2603 | /* Compute buffer for path converted to UTF-16. */ |
2604 | utf16_ptr = (PBYTE) rpl + sizeof (REPARSE_LX_SYMLINK_BUFFER) | |
2605 | + rp->ReparseDataLength; | |
fb834bee CV |
2606 | /* Skip \0-termination added above. */ |
2607 | ++utf16_ptr; | |
2608 | /* Make sure pointer is aligned */ | |
4a36897a CV |
2609 | while ((intptr_t) utf16_ptr % sizeof (WCHAR)) |
2610 | ++utf16_ptr; | |
2611 | utf16_buf = (PWCHAR) utf16_ptr; | |
2612 | utf16_bufsize = NT_MAX_PATH - (utf16_buf - (PWCHAR) rpl); | |
fb834bee | 2613 | /* Now convert path to UTF-16. */ |
4a36897a CV |
2614 | utf16_bufsize = MultiByteToWideChar (CP_UTF8, 0, path_buf, path_len, |
2615 | utf16_buf, utf16_bufsize); | |
2616 | if (utf16_bufsize) | |
2617 | { | |
2618 | if (full_path) | |
2619 | { | |
2620 | utf16_buf[0] = utf16_buf[1]; /* Move drive letter to front */ | |
2621 | utf16_buf[1] = L':'; /* Add colon */ | |
2622 | } | |
2623 | RtlInitCountedUnicodeString (psymbuf, utf16_buf, | |
2624 | utf16_bufsize * sizeof (WCHAR)); | |
aec64798 | 2625 | return PATH_SYMLINK | PATH_REP | PATH_REP_NOAPI; |
4a36897a CV |
2626 | } |
2627 | return -EIO; | |
2628 | } | |
aa467e6e CV |
2629 | else if (rp->ReparseTag == IO_REPARSE_TAG_CYGUNIX) |
2630 | { | |
2631 | PREPARSE_GUID_DATA_BUFFER rgp = (PREPARSE_GUID_DATA_BUFFER) rp; | |
aa467e6e | 2632 | |
1949db78 | 2633 | if (memcmp (CYGWIN_SOCKET_GUID, &rgp->ReparseGuid, sizeof (GUID)) == 0) |
0e290489 | 2634 | #ifdef __WITH_AF_UNIX |
aec64798 | 2635 | return PATH_SOCKET | PATH_REP | PATH_REP_NOAPI; |
0e290489 KB |
2636 | #else |
2637 | /* Recognize this as a reparse point but not as a socket. */ | |
aec64798 | 2638 | return PATH_REP | PATH_REP_NOAPI; |
0e290489 | 2639 | #endif |
1870c688 | 2640 | } |
3e80cefb CV |
2641 | return 0; |
2642 | } | |
2643 | ||
2644 | int | |
2645 | symlink_info::check_reparse_point (HANDLE h, bool remote) | |
2646 | { | |
2647 | tmp_pathbuf tp; | |
2648 | PREPARSE_DATA_BUFFER rp = (PREPARSE_DATA_BUFFER) tp.c_get (); | |
2649 | UNICODE_STRING symbuf; | |
2650 | char srcbuf[SYMLINK_MAX + 7]; | |
2651 | ||
2652 | int ret = check_reparse_point_target (h, remote, rp, &symbuf); | |
2653 | if (ret <= 0) | |
3aec0f00 | 2654 | { |
3e80cefb CV |
2655 | if (ret == -EIO) |
2656 | { | |
2657 | set_error (EIO); | |
2658 | return 0; | |
2659 | } | |
855ea3fd CV |
2660 | /* Maybe it's a reparse point, but it's certainly not one we recognize. |
2661 | Drop REPARSE attribute so we don't try to use the flag accidentally. | |
2662 | It's just some arbitrary file or directory for us. */ | |
3aec0f00 | 2663 | fileattr &= ~FILE_ATTRIBUTE_REPARSE_POINT; |
3e80cefb | 2664 | return ret; |
3aec0f00 | 2665 | } |
aa467e6e | 2666 | /* ret is > 0, so it's a known reparse point, path in symbuf. */ |
c1023ee3 | 2667 | path_flags |= ret; |
aa467e6e | 2668 | if (ret & PATH_SYMLINK) |
0b4beaf4 KB |
2669 | { |
2670 | sys_wcstombs (srcbuf, SYMLINK_MAX + 7, symbuf.Buffer, | |
2671 | symbuf.Length / sizeof (WCHAR)); | |
2672 | /* A symlink is never a directory. */ | |
2673 | fileattr &= ~FILE_ATTRIBUTE_DIRECTORY; | |
2674 | return posixify (srcbuf); | |
2675 | } | |
2676 | else | |
2677 | return 0; | |
1870c688 CV |
2678 | } |
2679 | ||
2680 | int | |
2681 | symlink_info::check_nfs_symlink (HANDLE h) | |
2682 | { | |
2683 | tmp_pathbuf tp; | |
2684 | NTSTATUS status; | |
2685 | IO_STATUS_BLOCK io; | |
2686 | struct { | |
2687 | FILE_GET_EA_INFORMATION fgei; | |
2688 | char buf[sizeof (NFS_SYML_TARGET)]; | |
2689 | } fgei_buf; | |
2690 | PFILE_FULL_EA_INFORMATION pffei; | |
2691 | int res = 0; | |
2692 | ||
2693 | /* To find out if the file is a symlink and to get the symlink target, | |
2694 | try to fetch the NfsSymlinkTargetName EA. */ | |
2695 | fgei_buf.fgei.NextEntryOffset = 0; | |
2696 | fgei_buf.fgei.EaNameLength = sizeof (NFS_SYML_TARGET) - 1; | |
2697 | stpcpy (fgei_buf.fgei.EaName, NFS_SYML_TARGET); | |
2698 | pffei = (PFILE_FULL_EA_INFORMATION) tp.w_get (); | |
2699 | status = NtQueryEaFile (h, &io, pffei, NT_MAX_PATH * sizeof (WCHAR), TRUE, | |
2700 | &fgei_buf.fgei, sizeof fgei_buf, NULL, TRUE); | |
2701 | if (NT_SUCCESS (status) && pffei->EaValueLength > 0) | |
2702 | { | |
2703 | PWCHAR spath = (PWCHAR) | |
2704 | (pffei->EaName + pffei->EaNameLength + 1); | |
2705 | res = sys_wcstombs (contents, SYMLINK_MAX + 1, | |
ef750173 | 2706 | spath, pffei->EaValueLength); |
c1023ee3 | 2707 | path_flags |= PATH_SYMLINK; |
1870c688 CV |
2708 | } |
2709 | return res; | |
2710 | } | |
2711 | ||
2712 | int | |
2713 | symlink_info::posixify (char *srcbuf) | |
2714 | { | |
2715 | /* The definition for a path in a native symlink is a bit weird. The Flags | |
2716 | value seem to contain 0 for absolute paths (stored as NT native path) | |
2717 | and 1 for relative paths. Relative paths are paths not starting with a | |
2718 | drive letter. These are not converted to NT native, but stored as | |
2719 | given. A path starting with a single backslash is relative to the | |
2720 | current drive thus a "relative" value (Flags == 1). | |
2721 | Funny enough it's possible to store paths with slashes instead of | |
2722 | backslashes, but they are evaluated incorrectly by subsequent Windows | |
2723 | calls like CreateFile (ERROR_INVALID_NAME). So, what we do here is to | |
2724 | take paths starting with slashes at face value, evaluating them as | |
2725 | Cygwin specific POSIX paths. | |
2726 | A path starting with two slashes(!) or backslashes is converted into an | |
2727 | NT UNC path. Unfortunately, in contrast to POSIX rules, paths starting | |
2728 | with three or more (back)slashes are also converted into UNC paths, | |
a413f8a2 | 2729 | just incorrectly sticking to one redundant leading backslash. We go |
1870c688 CV |
2730 | along with this behaviour to avoid scenarios in which native tools access |
2731 | other files than Cygwin. | |
2732 | The above rules are used exactly the same way on Cygwin specific symlinks | |
2733 | (sysfiles and shortcuts) to eliminate non-POSIX paths in the output. */ | |
2734 | ||
2735 | /* Eliminate native NT prefixes. */ | |
2736 | if (srcbuf[0] == '\\' && !strncmp (srcbuf + 1, "??\\", 3)) | |
2737 | { | |
2738 | srcbuf += 4; | |
2739 | if (srcbuf[1] != ':') /* native UNC path */ | |
2740 | *(srcbuf += 2) = '\\'; | |
2741 | } | |
2742 | if (isdrive (srcbuf)) | |
2743 | mount_table->conv_to_posix_path (srcbuf, contents, 0); | |
2744 | else if (srcbuf[0] == '\\') | |
2745 | { | |
2746 | if (srcbuf[1] == '\\') /* UNC path */ | |
2747 | slashify (srcbuf, contents, 0); | |
2748 | else /* Paths starting with \ are current drive relative. */ | |
2749 | { | |
2750 | char cvtbuf[SYMLINK_MAX + 1]; | |
2751 | ||
2752 | stpcpy (cvtbuf + cygheap->cwd.get_drive (cvtbuf), srcbuf); | |
2753 | mount_table->conv_to_posix_path (cvtbuf, contents, 0); | |
2754 | } | |
2755 | } | |
2756 | else /* Everything else is taken as is. */ | |
2757 | slashify (srcbuf, contents, 0); | |
2758 | return strlen (contents); | |
2759 | } | |
2760 | ||
2761 | enum | |
2762 | { | |
2763 | SCAN_BEG, | |
2764 | SCAN_LNK, | |
2765 | SCAN_HASLNK, | |
2766 | SCAN_JUSTCHECK, | |
2767 | SCAN_JUSTCHECKTHIS, /* Never try to append a suffix. */ | |
2768 | SCAN_APPENDLNK, | |
2769 | SCAN_EXTRALNK, | |
2770 | SCAN_DONE, | |
2771 | }; | |
2772 | ||
2773 | class suffix_scan | |
2774 | { | |
2775 | const suffix_info *suffixes, *suffixes_start; | |
2776 | int nextstate; | |
2777 | char *eopath; | |
d1bef838 | 2778 | size_t namelen; |
1870c688 CV |
2779 | public: |
2780 | const char *path; | |
2781 | char *has (const char *, const suffix_info *); | |
2782 | int next (); | |
2783 | int lnk_match () {return nextstate >= SCAN_APPENDLNK;} | |
d1bef838 | 2784 | size_t name_len () {return namelen;} |
1870c688 CV |
2785 | }; |
2786 | ||
2787 | char * | |
2788 | suffix_scan::has (const char *in_path, const suffix_info *in_suffixes) | |
2789 | { | |
2790 | nextstate = SCAN_BEG; | |
2791 | suffixes = suffixes_start = in_suffixes; | |
2792 | ||
2793 | const char *fname = strrchr (in_path, '\\'); | |
2794 | fname = fname ? fname + 1 : in_path; | |
2795 | char *ext_here = strrchr (fname, '.'); | |
2796 | path = in_path; | |
2797 | eopath = strchr (path, '\0'); | |
2798 | ||
2799 | if (!ext_here) | |
2800 | goto noext; | |
2801 | ||
2802 | if (suffixes) | |
2803 | { | |
2804 | /* Check if the extension matches a known extension */ | |
2805 | for (const suffix_info *ex = in_suffixes; ex->name != NULL; ex++) | |
2806 | if (ascii_strcasematch (ext_here, ex->name)) | |
81adfe28 | 2807 | { |
1870c688 CV |
2808 | nextstate = SCAN_JUSTCHECK; |
2809 | suffixes = NULL; /* Has an extension so don't scan for one. */ | |
2810 | goto done; | |
81adfe28 | 2811 | } |
1870c688 | 2812 | } |
81adfe28 | 2813 | |
1870c688 CV |
2814 | /* Didn't match. Use last resort -- .lnk. */ |
2815 | if (ascii_strcasematch (ext_here, ".lnk")) | |
2816 | { | |
2817 | nextstate = SCAN_HASLNK; | |
2818 | suffixes = NULL; | |
2819 | } | |
81adfe28 | 2820 | |
1870c688 CV |
2821 | noext: |
2822 | ext_here = eopath; | |
81adfe28 | 2823 | |
1870c688 | 2824 | done: |
d1bef838 CV |
2825 | namelen = eopath - fname; |
2826 | /* Avoid attaching suffixes if the resulting filename would be invalid. | |
2827 | For performance reasons we don't check the length of a suffix, since | |
2828 | we know that all suffixes are 4 chars in length. | |
3bb346d5 | 2829 | |
d1bef838 CV |
2830 | FIXME: This is not really correct. A fully functional test should |
2831 | work on wide character paths. This would probably also speed | |
2832 | up symlink_info::check. */ | |
2833 | if (namelen > NAME_MAX - 4) | |
1870c688 CV |
2834 | { |
2835 | nextstate = SCAN_JUSTCHECKTHIS; | |
2836 | suffixes = NULL; | |
2837 | } | |
2838 | return ext_here; | |
2839 | } | |
81adfe28 | 2840 | |
1870c688 CV |
2841 | int |
2842 | suffix_scan::next () | |
2843 | { | |
2844 | for (;;) | |
2845 | { | |
2846 | if (!suffixes) | |
2847 | switch (nextstate) | |
81adfe28 | 2848 | { |
1870c688 CV |
2849 | case SCAN_BEG: |
2850 | suffixes = suffixes_start; | |
2851 | if (!suffixes) | |
2852 | { | |
2853 | nextstate = SCAN_LNK; | |
2854 | return 1; | |
2855 | } | |
2856 | nextstate = SCAN_EXTRALNK; | |
2857 | /* fall through to suffix checking below */ | |
2858 | break; | |
2859 | case SCAN_HASLNK: | |
2860 | nextstate = SCAN_APPENDLNK; /* Skip SCAN_BEG */ | |
2861 | return 1; | |
2862 | case SCAN_EXTRALNK: | |
2863 | nextstate = SCAN_DONE; | |
2864 | *eopath = '\0'; | |
2865 | return 0; | |
2866 | case SCAN_JUSTCHECK: | |
2867 | nextstate = SCAN_LNK; | |
2868 | return 1; | |
2869 | case SCAN_JUSTCHECKTHIS: | |
2870 | nextstate = SCAN_DONE; | |
2871 | return 1; | |
2872 | case SCAN_LNK: | |
2873 | case SCAN_APPENDLNK: | |
1870c688 | 2874 | nextstate = SCAN_DONE; |
d1bef838 CV |
2875 | if (namelen + (*eopath ? 8 : 4) > NAME_MAX) |
2876 | { | |
2877 | *eopath = '\0'; | |
2878 | return 0; | |
2879 | } | |
2880 | strcat (eopath, ".lnk"); | |
1870c688 CV |
2881 | return 1; |
2882 | default: | |
2883 | *eopath = '\0'; | |
81adfe28 CF |
2884 | return 0; |
2885 | } | |
81adfe28 | 2886 | |
1870c688 | 2887 | while (suffixes && suffixes->name) |
d1bef838 CV |
2888 | if (nextstate == SCAN_EXTRALNK |
2889 | && (!suffixes->addon || namelen > NAME_MAX - 8)) | |
1870c688 CV |
2890 | suffixes++; |
2891 | else | |
81adfe28 | 2892 | { |
1870c688 CV |
2893 | strcpy (eopath, suffixes->name); |
2894 | if (nextstate == SCAN_EXTRALNK) | |
2895 | strcat (eopath, ".lnk"); | |
2896 | suffixes++; | |
2897 | return 1; | |
81adfe28 | 2898 | } |
1870c688 CV |
2899 | suffixes = NULL; |
2900 | } | |
2901 | } | |
81adfe28 | 2902 | |
1870c688 CV |
2903 | bool |
2904 | symlink_info::set_error (int in_errno) | |
2905 | { | |
2906 | bool res; | |
fde4eaa1 CV |
2907 | if (!(pc_flags & PC_NO_ACCESS_CHECK) |
2908 | || in_errno == ENAMETOOLONG || in_errno == EIO) | |
1870c688 CV |
2909 | { |
2910 | error = in_errno; | |
2911 | res = true; | |
2912 | } | |
2913 | else if (in_errno == ENOENT) | |
2914 | res = true; | |
2915 | else | |
2916 | { | |
2917 | fileattr = FILE_ATTRIBUTE_NORMAL; | |
2918 | res = false; | |
2919 | } | |
2920 | return res; | |
2921 | } | |
2922 | ||
2923 | bool | |
2924 | symlink_info::parse_device (const char *contents) | |
2925 | { | |
2926 | char *endptr; | |
2927 | _major_t mymajor; | |
2928 | _major_t myminor; | |
ea58e20c | 2929 | __mode_t mymode; |
1870c688 CV |
2930 | |
2931 | mymajor = strtol (contents += 2, &endptr, 16); | |
2932 | if (endptr == contents) | |
2933 | return isdevice = false; | |
2934 | ||
2935 | contents = endptr; | |
2936 | myminor = strtol (++contents, &endptr, 16); | |
2937 | if (endptr == contents) | |
2938 | return isdevice = false; | |
2939 | ||
2940 | contents = endptr; | |
2941 | mymode = strtol (++contents, &endptr, 16); | |
2942 | if (endptr == contents) | |
2943 | return isdevice = false; | |
2944 | ||
2945 | if ((mymode & S_IFMT) == S_IFIFO) | |
2946 | { | |
2947 | mymajor = _major (FH_FIFO); | |
2948 | myminor = _minor (FH_FIFO); | |
2949 | } | |
81adfe28 | 2950 | |
1870c688 CV |
2951 | major = mymajor; |
2952 | minor = myminor; | |
2953 | mode = mymode; | |
2954 | return isdevice = true; | |
2955 | } | |
2956 | ||
2957 | /* Check if PATH is a symlink. PATH must be a valid Win32 path name. | |
2958 | ||
2959 | If PATH is a symlink, put the value of the symlink--the file to | |
2960 | which it points--into BUF. The value stored in BUF is not | |
2961 | necessarily null terminated. BUFLEN is the length of BUF; only up | |
2962 | to BUFLEN characters will be stored in BUF. BUF may be NULL, in | |
2963 | which case nothing will be stored. | |
2964 | ||
2965 | Set *SYML if PATH is a symlink. | |
2966 | ||
2967 | Set *EXEC if PATH appears to be executable. This is an efficiency | |
2968 | hack because we sometimes have to open the file anyhow. *EXEC will | |
2969 | not be set for every executable file. | |
2970 | ||
2971 | Return -1 on error, 0 if PATH is not a symlink, or the length | |
2972 | stored into BUF if PATH is a symlink. */ | |
2973 | ||
2974 | int | |
5a0d1edb CV |
2975 | symlink_info::check (char *path, const suffix_info *suffixes, fs_info &fs, |
2976 | path_conv_handle &conv_hdl) | |
1870c688 | 2977 | { |
6ff06a07 CV |
2978 | int res; |
2979 | HANDLE h; | |
2980 | NTSTATUS status; | |
2981 | UNICODE_STRING upath; | |
2982 | OBJECT_ATTRIBUTES attr; | |
2983 | IO_STATUS_BLOCK io; | |
1870c688 | 2984 | suffix_scan suffix; |
1870c688 | 2985 | |
8802178f | 2986 | const ULONG ci_flag = cygwin_shared->obcaseinsensitive |
c1023ee3 CV |
2987 | || (mount_flags & MOUNT_NOPOSIX) |
2988 | ? OBJ_CASE_INSENSITIVE : 0; | |
1870c688 CV |
2989 | /* TODO: Temporarily do all char->UNICODE conversion here. This should |
2990 | already be slightly faster than using Ascii functions. */ | |
2991 | tmp_pathbuf tp; | |
1870c688 | 2992 | tp.u_get (&upath); |
e4b57503 | 2993 | InitializeObjectAttributes (&attr, &upath, ci_flag, NULL, NULL); |
1870c688 | 2994 | |
6ff06a07 CV |
2995 | /* This label is used in case we encounter a FS which only handles |
2996 | DOS paths. See below. */ | |
b12d6d10 | 2997 | bool restarted = false; |
6ff06a07 CV |
2998 | restart: |
2999 | ||
3000 | h = NULL; | |
3001 | res = 0; | |
3002 | contents[0] = '\0'; | |
3003 | issymlink = true; | |
3004 | isdevice = false; | |
3005 | major = 0; | |
3006 | minor = 0; | |
3007 | mode = 0; | |
c1023ee3 CV |
3008 | // mount_flags is an incoming value set in path_conv */ |
3009 | path_flags = 0; | |
6ff06a07 | 3010 | |
6afd6301 | 3011 | PVOID eabuf = &nfs_aol_ffei; |
1870c688 CV |
3012 | ULONG easize = sizeof nfs_aol_ffei; |
3013 | ||
d1bef838 CV |
3014 | ext_here = suffix.has (path, suffixes); |
3015 | extn = ext_here - path; | |
b3cbb06c | 3016 | bool had_ext = !!*ext_here; |
d1bef838 CV |
3017 | |
3018 | /* If the filename is too long, don't even try. */ | |
3019 | if (suffix.name_len () > NAME_MAX) | |
3020 | { | |
3021 | set_error (ENAMETOOLONG); | |
3022 | goto file_not_symlink; | |
3023 | } | |
3024 | ||
1870c688 CV |
3025 | while (suffix.next ()) |
3026 | { | |
1870c688 | 3027 | error = 0; |
c1023ee3 | 3028 | get_nt_native_path (suffix.path, upath, mount_flags & MOUNT_DOS); |
1870c688 CV |
3029 | if (h) |
3030 | { | |
3031 | NtClose (h); | |
3032 | h = NULL; | |
3033 | } | |
3034 | /* The EA given to NtCreateFile allows to get a handle to a symlink on | |
3035 | an NFS share, rather than getting a handle to the target of the | |
3036 | symlink (which would spoil the task of this method quite a bit). | |
3037 | Fortunately it's ignored on most other file systems so we don't have | |
3038 | to special case NFS too much. */ | |
dd0821e3 CV |
3039 | status = NtCreateFile (&h, |
3040 | READ_CONTROL | FILE_READ_ATTRIBUTES | FILE_READ_EA, | |
3041 | &attr, &io, NULL, 0, FILE_SHARE_VALID_FLAGS, | |
3042 | FILE_OPEN, | |
1870c688 CV |
3043 | FILE_OPEN_REPARSE_POINT |
3044 | | FILE_OPEN_FOR_BACKUP_INTENT, | |
3045 | eabuf, easize); | |
61522196 | 3046 | debug_printf ("%y = NtCreateFile (%S)", status, &upath); |
1870c688 | 3047 | /* No right to access EAs or EAs not supported? */ |
3432d6f1 CV |
3048 | if (!NT_SUCCESS (status) |
3049 | && (status == STATUS_ACCESS_DENIED | |
3050 | || status == STATUS_EAS_NOT_SUPPORTED | |
3051 | || status == STATUS_NOT_SUPPORTED | |
3052 | || status == STATUS_INVALID_NETWORK_RESPONSE | |
3053 | /* Or a bug in Samba 3.2.x (x <= 7) when accessing a share's | |
3054 | root dir which has EAs enabled? */ | |
3055 | || status == STATUS_INVALID_PARAMETER)) | |
1870c688 | 3056 | { |
1870c688 | 3057 | /* If EAs are not supported, there's no sense to check them again |
ffea27fc | 3058 | with suffixes attached. So we set eabuf/easize to 0 here once. */ |
c45871c9 CV |
3059 | if (status == STATUS_EAS_NOT_SUPPORTED |
3060 | || status == STATUS_NOT_SUPPORTED) | |
7a70dda0 | 3061 | { |
1870c688 CV |
3062 | eabuf = NULL; |
3063 | easize = 0; | |
a888c079 | 3064 | } |
dd0821e3 CV |
3065 | status = NtOpenFile (&h, READ_CONTROL | FILE_READ_ATTRIBUTES, |
3066 | &attr, &io, FILE_SHARE_VALID_FLAGS, | |
2b41d940 CV |
3067 | FILE_OPEN_REPARSE_POINT |
3068 | | FILE_OPEN_FOR_BACKUP_INTENT); | |
61522196 | 3069 | debug_printf ("%y = NtOpenFile (no-EAs %S)", status, &upath); |
1870c688 | 3070 | } |
6ff06a07 CV |
3071 | if (status == STATUS_OBJECT_NAME_NOT_FOUND) |
3072 | { | |
6ff06a07 CV |
3073 | /* There are filesystems out in the wild (Netapp, NWFS, and others) |
3074 | which are uncapable of generating pathnames outside the Win32 | |
3075 | rules. That means, filenames on these FSes must not have a | |
3076 | leading space or trailing dots and spaces. This code snippet | |
3077 | manages them. I really hope it's streamlined enough not to | |
3078 | slow down normal operation. This extra check only kicks in if | |
3079 | we encountered a STATUS_OBJECT_NAME_NOT_FOUND *and* we didn't | |
a361f44c | 3080 | already attach a suffix. */ |
48fbe173 KB |
3081 | if (!restarted && !*ext_here && ext_here[-1] != '\\' |
3082 | && !(mount_flags & MOUNT_DOS)) | |
6ff06a07 | 3083 | { |
002a34fa | 3084 | /* Check for trailing dot or space or leading space in |
b86f999a | 3085 | last component. */ |
002a34fa CV |
3086 | char *p = ext_here - 1; |
3087 | if (*p != '.' && *p != ' ') | |
3088 | { | |
3089 | while (*--p != '\\') | |
7d00a5e3 | 3090 | assert(p >= path); |
002a34fa CV |
3091 | if (*++p != ' ') |
3092 | p = NULL; | |
3093 | } | |
3094 | if (p) | |
6ff06a07 | 3095 | { |
002a34fa CV |
3096 | /* If so, check if file resides on one of the known broken |
3097 | FSes only supporting filenames following DOS rules. */ | |
a361f44c | 3098 | fs.update (&upath, NULL); |
8802178f CV |
3099 | if (fs.has_dos_filenames_only ()) |
3100 | { | |
002a34fa | 3101 | /* If so, try again. Since we now know the FS, the |
b86f999a | 3102 | filenames will be tweaked to follow DOS rules via the |
002a34fa | 3103 | third parameter in the call to get_nt_native_path. */ |
c1023ee3 | 3104 | mount_flags |= MOUNT_DOS; |
8802178f CV |
3105 | restarted = true; |
3106 | goto restart; | |
3107 | } | |
43616e55 CV |
3108 | } |
3109 | } | |
3110 | } | |
61522196 CV |
3111 | else if (status == STATUS_NETWORK_OPEN_RESTRICTION |
3112 | || status == STATUS_SYMLINK_CLASS_DISABLED) | |
3113 | { | |
3114 | /* These status codes are returned if you try to open a native | |
3115 | symlink and the usage of this kind of symlink is forbidden | |
3116 | (see fsutil). Since we can't open them at all, not even for | |
3117 | stat purposes, we have to return a POSIX error code which is | |
3118 | at least a bit helpful. | |
3119 | ||
3120 | Additionally Windows 8 introduces a bug in NFS: If you have | |
3121 | a symlink to a directory, with symlinks underneath, resolving | |
3122 | the second level of symlinks fails if remote->remote symlinks | |
3123 | are disabled in fsutil. Unfortunately that's the default. */ | |
3124 | set_error (ELOOP); | |
3125 | break; | |
3126 | } | |
c04ed45d | 3127 | |
1870c688 | 3128 | if (NT_SUCCESS (status) |
3432d6f1 CV |
3129 | /* Check file system while we're having the file open anyway. |
3130 | This speeds up path_conv noticably (~10%). */ | |
c80480bf CV |
3131 | && (fs.inited () || fs.update (&upath, h))) |
3132 | { | |
36d4eb12 CV |
3133 | status = conv_hdl.get_finfo (h, fs.is_nfs ()); |
3134 | if (NT_SUCCESS (status)) | |
3135 | fileattr = conv_hdl.get_dosattr (fs.is_nfs ()); | |
c80480bf CV |
3136 | } |
3137 | if (!NT_SUCCESS (status)) | |
1870c688 | 3138 | { |
61522196 | 3139 | debug_printf ("%y = NtQueryInformationFile (%S)", status, &upath); |
1870c688 CV |
3140 | fileattr = INVALID_FILE_ATTRIBUTES; |
3141 | ||
3142 | /* One of the inner path components is invalid, or the path contains | |
3143 | invalid characters. Bail out with ENOENT. | |
3144 | ||
ece49e40 CV |
3145 | STATUS_IO_REPARSE_TAG_NOT_HANDLED is returned when trying to |
3146 | traversing a WSL symlink. For all practical purposes it's | |
3147 | equivalent to traversing SYSTEM- or LNK-type symlink returning | |
3148 | STATUS_OBJECT_PATH_NOT_FOUND. | |
3149 | ||
1870c688 CV |
3150 | Note that additional STATUS_OBJECT_PATH_INVALID and |
3151 | STATUS_OBJECT_PATH_SYNTAX_BAD status codes exist. The first one | |
4ee93264 | 3152 | is seemingly not generated by NtQueryInformationFile, the latter |
1870c688 CV |
3153 | is only generated if the path is no absolute path within the |
3154 | NT name space, which should not happen and would point to an | |
3155 | error in get_nt_native_path. Both status codes are deliberately | |
3156 | not tested here unless proved necessary. */ | |
3157 | if (status == STATUS_OBJECT_PATH_NOT_FOUND | |
ece49e40 | 3158 | || status == STATUS_IO_REPARSE_TAG_NOT_HANDLED |
590f450a | 3159 | || status == STATUS_OBJECT_NAME_INVALID |
fad9568b CV |
3160 | || status == STATUS_BAD_NETWORK_PATH |
3161 | || status == STATUS_BAD_NETWORK_NAME | |
590f450a | 3162 | || status == STATUS_NO_MEDIA_IN_DEVICE) |
a888c079 | 3163 | { |
1870c688 | 3164 | set_error (ENOENT); |
563dda82 CV |
3165 | if (ext_tacked_on && !had_ext) |
3166 | { | |
3167 | *ext_here = '\0'; | |
3168 | ext_tacked_on = false; | |
3169 | ext_here = NULL; | |
3170 | extn = 0; | |
3171 | } | |
1870c688 | 3172 | goto file_not_symlink; |
7a70dda0 | 3173 | } |
1870c688 CV |
3174 | if (status != STATUS_OBJECT_NAME_NOT_FOUND |
3175 | && status != STATUS_NO_SUCH_FILE) /* ENOENT on NFS or 9x share */ | |
81adfe28 | 3176 | { |
1870c688 CV |
3177 | /* The file exists, but the user can't access it for one reason |
3178 | or the other. To get the file attributes we try to access the | |
3179 | information by opening the parent directory and getting the | |
3180 | file attributes using a matching NtQueryDirectoryFile call. */ | |
3181 | UNICODE_STRING dirname, basename; | |
3182 | OBJECT_ATTRIBUTES dattr; | |
3183 | HANDLE dir; | |
3184 | struct { | |
eed35efb | 3185 | FILE_ID_BOTH_DIR_INFORMATION fdi; |
1870c688 CV |
3186 | WCHAR dummy_buf[NAME_MAX + 1]; |
3187 | } fdi_buf; | |
3188 | ||
3189 | RtlSplitUnicodePath (&upath, &dirname, &basename); | |
e4b57503 CV |
3190 | InitializeObjectAttributes (&dattr, &dirname, ci_flag, |
3191 | NULL, NULL); | |
1870c688 CV |
3192 | status = NtOpenFile (&dir, SYNCHRONIZE | FILE_LIST_DIRECTORY, |
3193 | &dattr, &io, FILE_SHARE_VALID_FLAGS, | |
3194 | FILE_SYNCHRONOUS_IO_NONALERT | |
3195 | | FILE_OPEN_FOR_BACKUP_INTENT | |
3196 | | FILE_DIRECTORY_FILE); | |
3197 | if (!NT_SUCCESS (status)) | |
3198 | { | |
61522196 | 3199 | debug_printf ("%y = NtOpenFile(%S)", status, &dirname); |
14c622c6 CV |
3200 | /* There's a special case if the file is itself the root |
3201 | of a drive which is not accessible by the current user. | |
3202 | This case is only recognized by the length of the | |
3203 | basename part. If it's 0, the incoming file is the | |
3204 | root of a drive. So we at least know it's a directory. */ | |
85bfa906 CV |
3205 | if (basename.Length) |
3206 | fileattr = FILE_ATTRIBUTE_DIRECTORY; | |
3207 | else | |
3208 | { | |
3209 | fileattr = 0; | |
3210 | set_error (geterrno_from_nt_status (status)); | |
3211 | } | |
1870c688 CV |
3212 | } |
3213 | else | |
3214 | { | |
dc7dfa3a | 3215 | status = NtQueryDirectoryFile (dir, NULL, NULL, NULL, &io, |
1870c688 | 3216 | &fdi_buf, sizeof fdi_buf, |
eed35efb | 3217 | FileIdBothDirectoryInformation, |
1870c688 | 3218 | TRUE, &basename, TRUE); |
752c477b CV |
3219 | /* Take the opportunity to check file system while we're |
3220 | having the handle to the parent dir. */ | |
b7d3e6d7 | 3221 | fs.update (&upath, dir); |
1870c688 CV |
3222 | NtClose (dir); |
3223 | if (!NT_SUCCESS (status)) | |
3224 | { | |
61522196 | 3225 | debug_printf ("%y = NtQueryDirectoryFile(%S)", |
1870c688 | 3226 | status, &dirname); |
3462d736 CV |
3227 | if (status == STATUS_NO_SUCH_FILE) |
3228 | { | |
3229 | /* This can happen when trying to access files | |
3230 | which match DOS device names on SMB shares. | |
3231 | NtOpenFile failed with STATUS_ACCESS_DENIED, | |
3232 | but the NtQueryDirectoryFile tells us the | |
3233 | file doesn't exist. We're suspicious in this | |
3234 | case and retry with the next suffix instead of | |
3235 | just giving up. */ | |
3236 | set_error (ENOENT); | |
3237 | continue; | |
3238 | } | |
1870c688 CV |
3239 | fileattr = 0; |
3240 | } | |
3241 | else | |
c80480bf | 3242 | { |
eed35efb | 3243 | PFILE_ALL_INFORMATION pfai = conv_hdl.fai (); |
2d355410 | 3244 | |
c80480bf | 3245 | fileattr = fdi_buf.fdi.FileAttributes; |
eed35efb CV |
3246 | memcpy (&pfai->BasicInformation.CreationTime, |
3247 | &fdi_buf.fdi.CreationTime, | |
3248 | 4 * sizeof (LARGE_INTEGER)); | |
3249 | pfai->BasicInformation.FileAttributes = fileattr; | |
3250 | pfai->StandardInformation.AllocationSize.QuadPart | |
1df35772 | 3251 | = fdi_buf.fdi.AllocationSize.QuadPart; |
eed35efb | 3252 | pfai->StandardInformation.EndOfFile.QuadPart |
1df35772 | 3253 | = fdi_buf.fdi.EndOfFile.QuadPart; |
eed35efb CV |
3254 | pfai->StandardInformation.NumberOfLinks = 1; |
3255 | pfai->InternalInformation.IndexNumber.QuadPart | |
3256 | = fdi_buf.fdi.FileId.QuadPart; | |
c80480bf | 3257 | } |
1870c688 CV |
3258 | } |
3259 | ext_tacked_on = !!*ext_here; | |
81adfe28 | 3260 | goto file_not_symlink; |
1870c688 CV |
3261 | } |
3262 | set_error (ENOENT); | |
3263 | continue; | |
3264 | } | |
81adfe28 | 3265 | |
1870c688 | 3266 | ext_tacked_on = !!*ext_here; |
b3cbb06c | 3267 | /* Don't allow to returns directories with appended suffix. If we found |
b86f999a | 3268 | a directory with a suffix which has been appended here, then this |
b3cbb06c CV |
3269 | directory doesn't match the request. So, just do as usual if file |
3270 | hasn't been found. */ | |
3271 | if (ext_tacked_on && !had_ext && (fileattr & FILE_ATTRIBUTE_DIRECTORY)) | |
3272 | { | |
3273 | set_error (ENOENT); | |
3274 | continue; | |
3275 | } | |
81adfe28 | 3276 | |
81adfe28 CF |
3277 | res = -1; |
3278 | ||
dd0821e3 CV |
3279 | /* Reparse points are potentially symlinks. This check must be |
3280 | performed before checking the SYSTEM attribute for sysfile | |
00e9bf2b | 3281 | symlinks, since reparse points can have this flag set, too. */ |
dd0821e3 CV |
3282 | if ((fileattr & FILE_ATTRIBUTE_REPARSE_POINT)) |
3283 | { | |
855ea3fd | 3284 | res = check_reparse_point (h, fs.is_remote_drive ()); |
492ee4ee | 3285 | if (res > 0) |
dd0821e3 | 3286 | { |
492ee4ee | 3287 | /* A symlink is never a directory. */ |
eed35efb CV |
3288 | conv_hdl.fai ()->BasicInformation.FileAttributes |
3289 | &= ~FILE_ATTRIBUTE_DIRECTORY; | |
492ee4ee CV |
3290 | break; |
3291 | } | |
0b4beaf4 KB |
3292 | else if (res == 0 && (path_flags & PATH_REP)) |
3293 | /* Known reparse point but not a symlink. */ | |
3294 | goto file_not_symlink; | |
492ee4ee CV |
3295 | else |
3296 | { | |
3297 | /* Volume moint point or unrecognized reparse point type. | |
3298 | Make sure the open handle is not used in later stat calls. | |
3299 | The handle has been opened with the FILE_OPEN_REPARSE_POINT | |
3300 | flag, so it's a handle to the reparse point, not a handle | |
3301 | to the volumes root dir. */ | |
fde4eaa1 | 3302 | pc_flags &= ~PC_KEEP_HANDLE; |
492ee4ee | 3303 | /* Volume mount point: The filesystem information for the top |
dd0821e3 CV |
3304 | level directory should be for the volume top level directory, |
3305 | rather than for the reparse point itself. So we fetch the | |
3306 | filesystem information again, but with a NULL handle. | |
3307 | This does what we want because fs_info::update opens the | |
3308 | handle without FILE_OPEN_REPARSE_POINT. */ | |
3e80cefb | 3309 | if (res < 0) |
492ee4ee | 3310 | fs.update (&upath, NULL); |
dd0821e3 CV |
3311 | } |
3312 | } | |
3313 | ||
1870c688 CV |
3314 | /* Windows shortcuts are potentially treated as symlinks. Valid Cygwin |
3315 | & U/WIN shortcuts are R/O, but definitely not directories. */ | |
dd0821e3 | 3316 | else if ((fileattr & (FILE_ATTRIBUTE_READONLY | FILE_ATTRIBUTE_DIRECTORY)) |
1870c688 CV |
3317 | == FILE_ATTRIBUTE_READONLY && suffix.lnk_match ()) |
3318 | { | |
dd0821e3 CV |
3319 | HANDLE sym_h; |
3320 | ||
3321 | status = NtOpenFile (&sym_h, SYNCHRONIZE | GENERIC_READ, &attr, &io, | |
3322 | FILE_SHARE_VALID_FLAGS, | |
3323 | FILE_OPEN_FOR_BACKUP_INTENT | |
3324 | | FILE_SYNCHRONOUS_IO_NONALERT); | |
3325 | if (!NT_SUCCESS (status)) | |
5a0d1edb CV |
3326 | res = 0; |
3327 | else | |
dd0821e3 CV |
3328 | { |
3329 | res = check_shortcut (sym_h); | |
3330 | NtClose (sym_h); | |
3331 | } | |
1870c688 CV |
3332 | if (!res) |
3333 | { | |
dd0821e3 CV |
3334 | /* If searching for `foo' and then finding a `foo.lnk' which |
3335 | is no shortcut, return the same as if file not found. */ | |
dc7dfa3a CV |
3336 | if (ext_tacked_on) |
3337 | { | |
3338 | fileattr = INVALID_FILE_ATTRIBUTES; | |
3339 | set_error (ENOENT); | |
3340 | continue; | |
3341 | } | |
1870c688 | 3342 | } |
dc7dfa3a CV |
3343 | else if (contents[0] != ':' || contents[1] != '\\' |
3344 | || !parse_device (contents)) | |
3345 | break; | |
3346 | } | |
3347 | ||
3348 | /* If searching for `foo' and then finding a `foo.lnk' which is | |
3349 | no shortcut, return the same as if file not found. */ | |
3350 | else if (suffix.lnk_match () && ext_tacked_on) | |
b86f999a | 3351 | { |
dc7dfa3a CV |
3352 | fileattr = INVALID_FILE_ATTRIBUTES; |
3353 | set_error (ENOENT); | |
3354 | continue; | |
1870c688 | 3355 | } |
fe6934da | 3356 | |
1870c688 CV |
3357 | /* This is the old Cygwin method creating symlinks. A symlink will |
3358 | have the `system' file attribute. Only files can be symlinks | |
3359 | (which can be symlinks to directories). */ | |
3360 | else if ((fileattr & (FILE_ATTRIBUTE_SYSTEM | FILE_ATTRIBUTE_DIRECTORY)) | |
3361 | == FILE_ATTRIBUTE_SYSTEM) | |
3362 | { | |
dd0821e3 CV |
3363 | HANDLE sym_h; |
3364 | ||
3365 | status = NtOpenFile (&sym_h, SYNCHRONIZE | GENERIC_READ, &attr, &io, | |
3366 | FILE_SHARE_VALID_FLAGS, | |
3367 | FILE_OPEN_FOR_BACKUP_INTENT | |
3368 | | FILE_SYNCHRONOUS_IO_NONALERT); | |
3369 | ||
3370 | if (!NT_SUCCESS (status)) | |
5a0d1edb CV |
3371 | res = 0; |
3372 | else | |
dd0821e3 CV |
3373 | { |
3374 | res = check_sysfile (sym_h); | |
3375 | NtClose (sym_h); | |
3376 | } | |
dc7dfa3a CV |
3377 | if (res) |
3378 | break; | |
1870c688 | 3379 | } |
fe6934da | 3380 | |
5a0d1edb CV |
3381 | /* If the file is on an NFS share and could be opened with extended |
3382 | attributes, check if it's a symlink. Only files can be symlinks | |
1870c688 | 3383 | (which can be symlinks to directories). */ |
2d355410 | 3384 | else if (fs.is_nfs () && (conv_hdl.nfsattr ()->type & 7) == NF3LNK) |
1870c688 | 3385 | { |
ab3cd888 | 3386 | res = check_nfs_symlink (h); |
dc7dfa3a CV |
3387 | if (res) |
3388 | break; | |
1870c688 | 3389 | } |
1fd5e000 | 3390 | |
dc7dfa3a | 3391 | /* Normal file. */ |
1870c688 CV |
3392 | file_not_symlink: |
3393 | issymlink = false; | |
3394 | syscall_printf ("%s", isdevice ? "is a device" : "not a symlink"); | |
3395 | res = 0; | |
3396 | break; | |
3397 | } | |
70c370d6 | 3398 | |
1870c688 | 3399 | if (h) |
5a0d1edb | 3400 | { |
fde4eaa1 | 3401 | if (pc_flags & PC_KEEP_HANDLE) |
dd0821e3 | 3402 | conv_hdl.set (h); |
5a0d1edb CV |
3403 | else |
3404 | NtClose (h); | |
3405 | } | |
0f565126 | 3406 | |
c1023ee3 CV |
3407 | syscall_printf ("%d = symlink.check(%s, %p) (mount_flags %y, path_flags %y)", |
3408 | res, suffix.path, contents, mount_flags, path_flags); | |
1870c688 CV |
3409 | return res; |
3410 | } | |
3411 | ||
3412 | /* "path" is the path in a virtual symlink. Set a symlink_info struct from | |
3413 | that and proceed with further path checking afterwards. */ | |
3414 | int | |
3415 | symlink_info::set (char *path) | |
3416 | { | |
3417 | strcpy (contents, path); | |
c1023ee3 CV |
3418 | mount_flags = 0; |
3419 | path_flags = PATH_SYMLINK; | |
1870c688 CV |
3420 | fileattr = FILE_ATTRIBUTE_NORMAL; |
3421 | error = 0; | |
3422 | issymlink = true; | |
3423 | isdevice = false; | |
e4b57503 | 3424 | ext_tacked_on = false; |
1870c688 CV |
3425 | ext_here = NULL; |
3426 | extn = major = minor = mode = 0; | |
3427 | return strlen (path); | |
3428 | } | |
3429 | ||
1870c688 | 3430 | /* readlink system call */ |
2cf9359a | 3431 | |
1870c688 | 3432 | extern "C" ssize_t |
3073f26d | 3433 | readlink (const char *__restrict path, char *__restrict buf, size_t buflen) |
1870c688 CV |
3434 | { |
3435 | if (buflen < 0) | |
3436 | { | |
3437 | set_errno (ENAMETOOLONG); | |
3438 | return -1; | |
3439 | } | |
1fd5e000 | 3440 | |
1870c688 | 3441 | path_conv pathbuf (path, PC_SYM_CONTENTS, stat_suffixes); |
772e2322 | 3442 | |
1870c688 CV |
3443 | if (pathbuf.error) |
3444 | { | |
3445 | set_errno (pathbuf.error); | |
61522196 | 3446 | syscall_printf ("-1 = readlink (%s, %p, %lu)", path, buf, buflen); |
1870c688 CV |
3447 | return -1; |
3448 | } | |
1fd5e000 | 3449 | |
1870c688 CV |
3450 | if (!pathbuf.exists ()) |
3451 | { | |
3452 | set_errno (ENOENT); | |
3453 | return -1; | |
3454 | } | |
1fd5e000 | 3455 | |
1870c688 CV |
3456 | if (!pathbuf.issymlink ()) |
3457 | { | |
3458 | if (pathbuf.exists ()) | |
3459 | set_errno (EINVAL); | |
3460 | return -1; | |
3461 | } | |
81adfe28 | 3462 | |
efb1f061 CV |
3463 | size_t pathbuf_len = strlen (pathbuf.get_win32 ()); |
3464 | ssize_t len = MIN (buflen, pathbuf_len); | |
1870c688 CV |
3465 | memcpy (buf, pathbuf.get_win32 (), len); |
3466 | ||
3467 | /* errno set by symlink.check if error */ | |
3468 | return len; | |
3469 | } | |
3470 | ||
3471 | /* Some programs rely on st_dev/st_ino being unique for each file. | |
3472 | Hash the path name and hope for the best. The hash arg is not | |
3473 | always initialized to zero since readdir needs to compute the | |
3474 | dirent ino_t based on a combination of the hash of the directory | |
3475 | done during the opendir call and the hash or the filename within | |
3476 | the directory. FIXME: Not bullet-proof. */ | |
3477 | /* Cygwin internal */ | |
1f36328e | 3478 | ino_t __reg2 |
61522196 | 3479 | hash_path_name (ino_t hash, PUNICODE_STRING name) |
1870c688 CV |
3480 | { |
3481 | if (name->Length == 0) | |
3482 | return hash; | |
3483 | ||
3484 | /* Build up hash. Name is already normalized */ | |
3485 | USHORT len = name->Length / sizeof (WCHAR); | |
3486 | for (USHORT idx = 0; idx < len; ++idx) | |
3487 | hash = RtlUpcaseUnicodeChar (name->Buffer[idx]) | |
3488 | + (hash << 6) + (hash << 16) - hash; | |
3489 | return hash; | |
3490 | } | |
3491 | ||
1f36328e | 3492 | ino_t __reg2 |
61522196 | 3493 | hash_path_name (ino_t hash, PCWSTR name) |
1870c688 CV |
3494 | { |
3495 | UNICODE_STRING uname; | |
3496 | RtlInitUnicodeString (&uname, name); | |
3497 | return hash_path_name (hash, &uname); | |
3498 | } | |
3499 | ||
1f36328e | 3500 | ino_t __reg2 |
61522196 | 3501 | hash_path_name (ino_t hash, const char *name) |
1870c688 CV |
3502 | { |
3503 | UNICODE_STRING uname; | |
3504 | RtlCreateUnicodeStringFromAsciiz (&uname, name); | |
61522196 | 3505 | ino_t ret = hash_path_name (hash, &uname); |
1870c688 CV |
3506 | RtlFreeUnicodeString (&uname); |
3507 | return ret; | |
3508 | } | |
3509 | ||
3510 | extern "C" char * | |
3511 | getcwd (char *buf, size_t ulen) | |
3512 | { | |
3513 | char* res = NULL; | |
3f3bd101 CV |
3514 | |
3515 | __try | |
3516 | { | |
3517 | if (ulen == 0 && buf) | |
3518 | set_errno (EINVAL); | |
3519 | else | |
3520 | res = cygheap->cwd.get (buf, 1, 1, ulen); | |
3521 | } | |
3522 | __except (EFAULT) {} | |
3523 | __endtry | |
1870c688 CV |
3524 | return res; |
3525 | } | |
3526 | ||
3527 | /* getwd: Legacy. */ | |
3528 | extern "C" char * | |
3529 | getwd (char *buf) | |
3530 | { | |
3531 | return getcwd (buf, PATH_MAX + 1); /*Per SuSv3!*/ | |
3532 | } | |
3533 | ||
0b5355f1 YS |
3534 | extern "C" char * |
3535 | get_current_dir_name (void) | |
3536 | { | |
b9f131c8 | 3537 | const char *pwd = getenv ("PWD"); |
0b5355f1 | 3538 | char *cwd = getcwd (NULL, 0); |
61522196 | 3539 | struct stat pwdbuf, cwdbuf; |
0b5355f1 | 3540 | |
b9f131c8 CF |
3541 | if (pwd && strcmp (pwd, cwd) != 0 |
3542 | && stat64 (pwd, &pwdbuf) == 0 | |
3543 | && stat64 (cwd, &cwdbuf) == 0 | |
3544 | && pwdbuf.st_dev == cwdbuf.st_dev | |
3545 | && pwdbuf.st_ino == cwdbuf.st_ino) | |
0b5355f1 | 3546 | { |
b9f131c8 CF |
3547 | cwd = (char *) realloc (cwd, strlen (pwd) + 1); |
3548 | strcpy (cwd, pwd); | |
0b5355f1 YS |
3549 | } |
3550 | ||
3551 | return cwd; | |
3552 | } | |
3553 | ||
1870c688 CV |
3554 | /* chdir: POSIX 5.2.1.1 */ |
3555 | extern "C" int | |
3556 | chdir (const char *in_dir) | |
3557 | { | |
3f3bd101 CV |
3558 | int res = -1; |
3559 | ||
3560 | __try | |
1870c688 | 3561 | { |
3f3bd101 CV |
3562 | if (!*in_dir) |
3563 | { | |
3564 | set_errno (ENOENT); | |
3565 | __leave; | |
3566 | } | |
02782489 | 3567 | |
3f3bd101 | 3568 | syscall_printf ("dir '%s'", in_dir); |
1fd5e000 | 3569 | |
c1023ee3 | 3570 | /* Convert path. PC_NONULLEMPTY ensures that we don't check for |
4bfa93f1 | 3571 | NULL/empty/invalid again. */ |
c1023ee3 | 3572 | path_conv path (in_dir, PC_SYM_FOLLOW | PC_POSIX | PC_NONULLEMPTY); |
3f3bd101 CV |
3573 | if (path.error) |
3574 | { | |
3575 | set_errno (path.error); | |
3576 | syscall_printf ("-1 = chdir (%s)", in_dir); | |
3577 | __leave; | |
3578 | } | |
edab6053 | 3579 | |
3f3bd101 CV |
3580 | const char *posix_cwd = NULL; |
3581 | dev_t devn = path.get_device (); | |
3582 | if (!path.exists ()) | |
3583 | set_errno (ENOENT); | |
3584 | else if (!path.isdir ()) | |
3585 | set_errno (ENOTDIR); | |
3586 | else if (!isvirtual_dev (devn)) | |
3587 | { | |
3588 | /* The sequence chdir("xx"); chdir(".."); must be a noop if xx | |
3589 | is not a symlink. This is exploited by find.exe. | |
d2bd82aa | 3590 | The posix_cwd is just path.get_posix (). |
3f3bd101 CV |
3591 | In other cases we let cwd.set obtain the Posix path through |
3592 | the mount table. */ | |
d2bd82aa CV |
3593 | if (!isdrive (path.get_posix ())) |
3594 | posix_cwd = path.get_posix (); | |
3f3bd101 CV |
3595 | res = 0; |
3596 | } | |
3597 | else | |
3598 | { | |
d2bd82aa | 3599 | posix_cwd = path.get_posix (); |
3f3bd101 CV |
3600 | res = 0; |
3601 | } | |
3602 | ||
3603 | if (!res) | |
3604 | res = cygheap->cwd.set (&path, posix_cwd); | |
3605 | ||
3606 | /* Note that we're accessing cwd.posix without a lock here. | |
3607 | I didn't think it was worth locking just for strace. */ | |
3608 | syscall_printf ("%R = chdir() cygheap->cwd.posix '%s' native '%S'", res, | |
3609 | cygheap->cwd.get_posix (), path.get_nt_native_path ()); | |
1870c688 | 3610 | } |
3f3bd101 CV |
3611 | __except (EFAULT) |
3612 | { | |
3613 | res = -1; | |
3614 | } | |
3615 | __endtry | |
1870c688 CV |
3616 | return res; |
3617 | } | |
3618 | ||
3619 | extern "C" int | |
3620 | fchdir (int fd) | |
3621 | { | |
3622 | int res; | |
3623 | cygheap_fdget cfd (fd); | |
3624 | if (cfd >= 0) | |
3625 | res = chdir (cfd->get_name ()); | |
3626 | else | |
3627 | res = -1; | |
3628 | ||
b9aa8149 | 3629 | syscall_printf ("%R = fchdir(%d)", res, fd); |
1870c688 CV |
3630 | return res; |
3631 | } | |
3632 | ||
3633 | /******************** Exported Path Routines *********************/ | |
3634 | ||
3635 | /* Cover functions to the path conversion routines. | |
3636 | These are exported to the world as cygwin_foo by cygwin.din. */ | |
edab6053 | 3637 | |
1870c688 CV |
3638 | #define return_with_errno(x) \ |
3639 | do {\ | |
3640 | int err = (x);\ | |
3641 | if (!err)\ | |
3642 | return 0;\ | |
3643 | set_errno (err);\ | |
3644 | return -1;\ | |
3645 | } while (0) | |
3646 | ||
3647 | extern "C" ssize_t | |
3648 | cygwin_conv_path (cygwin_conv_path_t what, const void *from, void *to, | |
3649 | size_t size) | |
3650 | { | |
3651 | tmp_pathbuf tp; | |
1870c688 CV |
3652 | path_conv p; |
3653 | size_t lsiz = 0; | |
3654 | char *buf = NULL; | |
06cc41a6 | 3655 | PWCHAR path = NULL; |
1870c688 | 3656 | int error = 0; |
8b83da2d | 3657 | int how = what & CCP_CONVFLAGS_MASK; |
5250e27f | 3658 | what &= CCP_CONVTYPE_MASK; |
3f3bd101 | 3659 | int ret = -1; |
37169691 | 3660 | |
3f3bd101 | 3661 | __try |
d21edf52 | 3662 | { |
3f3bd101 CV |
3663 | if (!from) |
3664 | { | |
3665 | set_errno (EINVAL); | |
3666 | __leave; | |
3667 | } | |
d21edf52 | 3668 | |
3f3bd101 CV |
3669 | switch (what) |
3670 | { | |
3671 | case CCP_POSIX_TO_WIN_A: | |
43f65cdd | 3672 | { |
3f3bd101 CV |
3673 | p.check ((const char *) from, |
3674 | PC_POSIX | PC_SYM_FOLLOW | PC_SYM_NOFOLLOW_REP | |
13bfb3c6 | 3675 | | PC_NO_ACCESS_CHECK |
937a2d92 | 3676 | | ((how & CCP_RELATIVE) ? PC_NOFULL : 0), stat_suffixes); |
3f3bd101 CV |
3677 | if (p.error) |
3678 | { | |
3679 | set_errno (p.error); | |
3680 | __leave; | |
3681 | } | |
3682 | PUNICODE_STRING up = p.get_nt_native_path (); | |
3683 | buf = tp.c_get (); | |
3684 | sys_wcstombs (buf, NT_MAX_PATH, | |
5250e27f | 3685 | up->Buffer, up->Length / sizeof (WCHAR)); |
3f3bd101 CV |
3686 | /* Convert native path to standard DOS path. */ |
3687 | if (!strncmp (buf, "\\??\\", 4)) | |
3688 | { | |
3689 | buf += 4; | |
3690 | if (buf[1] != ':') /* native UNC path */ | |
3691 | *(buf += 2) = '\\'; | |
3692 | } | |
3693 | else if (*buf == '\\') | |
3694 | { | |
3695 | /* Device name points to somewhere else in the NT namespace. | |
3696 | Use GLOBALROOT prefix to convert to Win32 path. */ | |
3697 | char *p = buf + sys_wcstombs (buf, NT_MAX_PATH, | |
3698 | ro_u_globalroot.Buffer, | |
3699 | ro_u_globalroot.Length | |
3700 | / sizeof (WCHAR)); | |
3701 | sys_wcstombs (p, NT_MAX_PATH - (p - buf), | |
3702 | up->Buffer, up->Length / sizeof (WCHAR)); | |
3703 | } | |
3704 | lsiz = strlen (buf) + 1; | |
3705 | /* TODO: Incoming "." is a special case which leads to a trailing | |
3706 | backslash ".\\" in the Win32 path. That's a result of the | |
3707 | conversion in normalize_posix_path. This should not occur | |
3708 | so the below code is just a band-aid. */ | |
5aa8817e | 3709 | if ((how & CCP_RELATIVE) && !strcmp ((const char *) from, ".") |
3f3bd101 CV |
3710 | && !strcmp (buf, ".\\")) |
3711 | { | |
3712 | lsiz = 2; | |
3713 | buf[1] = '\0'; | |
3714 | } | |
43f65cdd | 3715 | } |
3f3bd101 CV |
3716 | break; |
3717 | case CCP_POSIX_TO_WIN_W: | |
3718 | p.check ((const char *) from, | |
3719 | PC_POSIX | PC_SYM_FOLLOW | PC_SYM_NOFOLLOW_REP | |
13bfb3c6 | 3720 | | PC_NO_ACCESS_CHECK |
937a2d92 | 3721 | | ((how & CCP_RELATIVE) ? PC_NOFULL : 0), stat_suffixes); |
ca027229 | 3722 | if (p.error) |
3f3bd101 CV |
3723 | { |
3724 | set_errno (p.error); | |
3725 | __leave; | |
3726 | } | |
3727 | /* Relative Windows paths are always restricted to MAX_PATH chars. */ | |
5aa8817e | 3728 | if ((how & CCP_RELATIVE) && !isabspath (p.get_win32 ()) |
3f3bd101 CV |
3729 | && sys_mbstowcs (NULL, 0, p.get_win32 ()) > MAX_PATH) |
3730 | { | |
3731 | /* Recreate as absolute path. */ | |
3732 | p.check ((const char *) from, PC_POSIX | PC_SYM_FOLLOW | |
13bfb3c6 | 3733 | | PC_NO_ACCESS_CHECK); |
3f3bd101 CV |
3734 | if (p.error) |
3735 | { | |
3736 | set_errno (p.error); | |
3737 | __leave; | |
3738 | } | |
3739 | } | |
3740 | lsiz = p.get_wide_win32_path_len () + 1; | |
3741 | path = p.get_nt_native_path ()->Buffer; | |
06cc41a6 | 3742 | |
3f3bd101 CV |
3743 | /* Convert native path to standard DOS path. */ |
3744 | if (!wcsncmp (path, L"\\??\\", 4)) | |
06cc41a6 | 3745 | { |
3f3bd101 CV |
3746 | path[1] = L'\\'; |
3747 | ||
3748 | /* Drop long path prefix for short pathnames. Unfortunately there's | |
3749 | quite a bunch of Win32 functions, especially in user32.dll, | |
3750 | apparently, which don't grok long path names at all, not even | |
3751 | in the UNICODE API. */ | |
3752 | if ((path[5] == L':' && lsiz <= MAX_PATH + 4) | |
3753 | || (!wcsncmp (path + 4, L"UNC\\", 4) && lsiz <= MAX_PATH + 6)) | |
06cc41a6 | 3754 | { |
3f3bd101 CV |
3755 | path += 4; |
3756 | lsiz -= 4; | |
3757 | if (path[1] != L':') | |
3758 | { | |
3759 | *(path += 2) = '\\'; | |
3760 | lsiz -= 2; | |
3761 | } | |
06cc41a6 CV |
3762 | } |
3763 | } | |
3f3bd101 CV |
3764 | else if (*path == L'\\') |
3765 | { | |
3766 | /* Device name points to somewhere else in the NT namespace. | |
3767 | Use GLOBALROOT prefix to convert to Win32 path. */ | |
3768 | to = (void *) wcpcpy ((wchar_t *) to, ro_u_globalroot.Buffer); | |
3769 | lsiz += ro_u_globalroot.Length / sizeof (WCHAR); | |
3770 | } | |
3771 | /* TODO: Same ".\\" band-aid as in CCP_POSIX_TO_WIN_A case. */ | |
5aa8817e | 3772 | if ((how & CCP_RELATIVE) && !strcmp ((const char *) from, ".") |
3f3bd101 CV |
3773 | && !wcscmp (path, L".\\")) |
3774 | { | |
3775 | lsiz = 2; | |
3776 | path[1] = L'\0'; | |
3777 | } | |
3778 | lsiz *= sizeof (WCHAR); | |
3779 | break; | |
3780 | case CCP_WIN_A_TO_POSIX: | |
3781 | buf = tp.c_get (); | |
3782 | error = mount_table->conv_to_posix_path ((const char *) from, buf, | |
8b83da2d | 3783 | how | __CCP_APP_SLASH); |
3f3bd101 CV |
3784 | if (error) |
3785 | { | |
3786 | set_errno (p.error); | |
3787 | __leave; | |
3788 | } | |
3789 | lsiz = strlen (buf) + 1; | |
3790 | break; | |
3791 | case CCP_WIN_W_TO_POSIX: | |
3792 | buf = tp.c_get (); | |
3793 | error = mount_table->conv_to_posix_path ((const PWCHAR) from, buf, | |
8b83da2d | 3794 | how | __CCP_APP_SLASH); |
3f3bd101 CV |
3795 | if (error) |
3796 | { | |
3797 | set_errno (error); | |
3798 | __leave; | |
3799 | } | |
3800 | lsiz = strlen (buf) + 1; | |
3801 | break; | |
3802 | default: | |
3803 | set_errno (EINVAL); | |
3804 | __leave; | |
06cc41a6 | 3805 | } |
3f3bd101 | 3806 | if (!size) |
43f65cdd | 3807 | { |
3f3bd101 CV |
3808 | ret = lsiz; |
3809 | __leave; | |
43f65cdd | 3810 | } |
3f3bd101 | 3811 | if (size < lsiz) |
b86f999a | 3812 | { |
3f3bd101 CV |
3813 | set_errno (ENOSPC); |
3814 | __leave; | |
59cb363a | 3815 | } |
3f3bd101 CV |
3816 | switch (what) |
3817 | { | |
3818 | case CCP_POSIX_TO_WIN_A: | |
3819 | case CCP_WIN_A_TO_POSIX: | |
3820 | case CCP_WIN_W_TO_POSIX: | |
3821 | stpcpy ((char *) to, buf); | |
3822 | break; | |
3823 | case CCP_POSIX_TO_WIN_W: | |
3824 | wcpcpy ((PWCHAR) to, path); | |
3825 | break; | |
3826 | } | |
3827 | ret = 0; | |
1870c688 | 3828 | } |
3f3bd101 CV |
3829 | __except (EFAULT) {} |
3830 | __endtry | |
3831 | return ret; | |
1870c688 CV |
3832 | } |
3833 | ||
3834 | extern "C" void * | |
3835 | cygwin_create_path (cygwin_conv_path_t what, const void *from) | |
3836 | { | |
3837 | void *to; | |
3838 | ssize_t size = cygwin_conv_path (what, from, NULL, 0); | |
3839 | if (size <= 0) | |
27f1db48 CF |
3840 | to = NULL; |
3841 | else if (!(to = malloc (size))) | |
3842 | to = NULL; | |
1870c688 | 3843 | if (cygwin_conv_path (what, from, to, size) == -1) |
27f1db48 CF |
3844 | { |
3845 | free (to); | |
3846 | to = NULL; | |
3847 | } | |
1870c688 CV |
3848 | return to; |
3849 | } | |
3850 | ||
76f06705 | 3851 | #ifdef __i386__ |
1870c688 CV |
3852 | |
3853 | extern "C" int | |
3854 | cygwin_conv_to_win32_path (const char *path, char *win32_path) | |
3855 | { | |
3856 | return cygwin_conv_path (CCP_POSIX_TO_WIN_A | CCP_RELATIVE, path, win32_path, | |
3857 | MAX_PATH); | |
3858 | } | |
3859 | ||
3860 | extern "C" int | |
3861 | cygwin_conv_to_full_win32_path (const char *path, char *win32_path) | |
3862 | { | |
3863 | return cygwin_conv_path (CCP_POSIX_TO_WIN_A | CCP_ABSOLUTE, path, win32_path, | |
3864 | MAX_PATH); | |
3865 | } | |
3866 | ||
3867 | /* This is exported to the world as cygwin_foo by cygwin.din. */ | |
3868 | ||
3869 | extern "C" int | |
3870 | cygwin_conv_to_posix_path (const char *path, char *posix_path) | |
3871 | { | |
3872 | return cygwin_conv_path (CCP_WIN_A_TO_POSIX | CCP_RELATIVE, path, posix_path, | |
3873 | MAX_PATH); | |
3874 | } | |
3875 | ||
3876 | extern "C" int | |
3877 | cygwin_conv_to_full_posix_path (const char *path, char *posix_path) | |
3878 | { | |
3879 | return cygwin_conv_path (CCP_WIN_A_TO_POSIX | CCP_ABSOLUTE, path, posix_path, | |
3880 | MAX_PATH); | |
3881 | } | |
3882 | ||
76f06705 | 3883 | #endif /* __i386__ */ |
61522196 | 3884 | |
2bf78f09 | 3885 | /* The realpath function is required by POSIX:2008. */ |
1870c688 CV |
3886 | |
3887 | extern "C" char * | |
3073f26d | 3888 | realpath (const char *__restrict path, char *__restrict resolved) |
1870c688 | 3889 | { |
3f3bd101 CV |
3890 | tmp_pathbuf tp; |
3891 | char *tpath; | |
3892 | ||
1870c688 CV |
3893 | /* Make sure the right errno is returned if path is NULL. */ |
3894 | if (!path) | |
3895 | { | |
3896 | set_errno (EINVAL); | |
3897 | return NULL; | |
3898 | } | |
63958f00 | 3899 | |
1870c688 CV |
3900 | /* Guard reading from a potentially invalid path and writing to a |
3901 | potentially invalid resolved. */ | |
3f3bd101 | 3902 | __try |
1870c688 | 3903 | { |
5c759ab2 CV |
3904 | /* Win32 drive letter paths and, generally, any path starting with a |
3905 | backslash, have to be converted to a POSIX path first, because | |
3906 | path_conv leaves the incoming path untouched except for converting | |
3907 | backslashes to forward slashes. This also covers '\\?\ and '\??\' | |
3908 | path prefixes. */ | |
3909 | if (isdrive (path) || path[0] == '\\') | |
3f3bd101 CV |
3910 | { |
3911 | tpath = tp.c_get (); | |
3912 | mount_table->conv_to_posix_path (path, tpath, 0); | |
3913 | } | |
3914 | else | |
3915 | tpath = (char *) path; | |
63958f00 | 3916 | |
3f3bd101 | 3917 | path_conv real_path (tpath, PC_SYM_FOLLOW | PC_POSIX, stat_suffixes); |
37169691 | 3918 | |
1fd5e000 | 3919 | |
3f3bd101 CV |
3920 | /* POSIX 2008 requires malloc'ing if resolved is NULL, and states |
3921 | that using non-NULL resolved is asking for portability | |
3922 | problems. */ | |
1fd5e000 | 3923 | |
3f3bd101 | 3924 | if (!real_path.error && real_path.exists ()) |
1870c688 | 3925 | { |
1870c688 | 3926 | if (!resolved) |
3f3bd101 CV |
3927 | { |
3928 | resolved = (char *) | |
d2bd82aa | 3929 | malloc (strlen (real_path.get_posix ()) + 1); |
3f3bd101 CV |
3930 | if (!resolved) |
3931 | return NULL; | |
3932 | } | |
d2bd82aa | 3933 | strcpy (resolved, real_path.get_posix ()); |
3f3bd101 | 3934 | return resolved; |
1870c688 | 3935 | } |
1fd5e000 | 3936 | |
3f3bd101 CV |
3937 | /* FIXME: on error, Linux puts the name of the path |
3938 | component which could not be resolved into RESOLVED, but POSIX | |
3939 | does not require this. */ | |
3940 | if (resolved) | |
3941 | resolved[0] = '\0'; | |
3942 | set_errno (real_path.error ?: ENOENT); | |
3943 | } | |
3944 | __except (EFAULT) {} | |
3945 | __endtry | |
1870c688 CV |
3946 | return NULL; |
3947 | } | |
3948 | ||
2bf78f09 EB |
3949 | /* Linux provides this extension. Since the only portable use of |
3950 | realpath requires a NULL second argument, we might as well have a | |
3951 | one-argument wrapper. */ | |
3952 | extern "C" char * | |
3953 | canonicalize_file_name (const char *path) | |
3954 | { | |
3955 | return realpath (path, NULL); | |
3956 | } | |
3957 | ||
1870c688 CV |
3958 | /* Return non-zero if path is a POSIX path list. |
3959 | This is exported to the world as cygwin_foo by cygwin.din. | |
3960 | ||
3961 | DOCTOOL-START | |
3962 | <sect1 id="add-func-cygwin-posix-path-list-p"> | |
3963 | <para>Rather than use a mode to say what the "proper" path list | |
3964 | format is, we allow any, and give apps the tools they need to | |
3965 | convert between the two. If a ';' is present in the path list it's | |
3966 | a Win32 path list. Otherwise, if the first path begins with | |
3967 | [letter]: (in which case it can be the only element since if it | |
3968 | wasn't a ';' would be present) it's a Win32 path list. Otherwise, | |
3969 | it's a POSIX path list.</para> | |
3970 | </sect1> | |
3971 | DOCTOOL-END | |
3972 | */ | |
1fd5e000 | 3973 | |
1870c688 CV |
3974 | extern "C" int |
3975 | cygwin_posix_path_list_p (const char *path) | |
3976 | { | |
3977 | int posix_p = !(strchr (path, ';') || isdrive (path)); | |
3978 | return posix_p; | |
3979 | } | |
3980 | ||
3981 | /* These are used for apps that need to convert env vars like PATH back and | |
3982 | forth. The conversion is a two step process. First, an upper bound on the | |
3983 | size of the buffer needed is computed. Then the conversion is done. This | |
3984 | allows the caller to use alloca if it wants. */ | |
3985 | ||
3986 | static int | |
3987 | conv_path_list_buf_size (const char *path_list, bool to_posix) | |
3988 | { | |
3989 | int i, num_elms, max_mount_path_len, size; | |
3990 | const char *p; | |
3991 | ||
3992 | path_conv pc(".", PC_POSIX); | |
3993 | /* The theory is that an upper bound is | |
3994 | current_size + (num_elms * max_mount_path_len) */ | |
3995 | /* FIXME: This method is questionable in the long run. */ | |
3996 | ||
3997 | unsigned nrel; | |
3998 | char delim = to_posix ? ';' : ':'; | |
3999 | for (p = path_list, num_elms = nrel = 0; p; num_elms++) | |
4000 | { | |
4001 | if (!isabspath (p)) | |
4002 | nrel++; | |
4003 | p = strchr (++p, delim); | |
4004 | } | |
1fd5e000 | 4005 | |
1870c688 CV |
4006 | /* 7: strlen ("//c") + slop, a conservative initial value */ |
4007 | for (max_mount_path_len = sizeof ("/cygdrive/X"), i = 0; | |
4008 | i < mount_table->nmounts; i++) | |
4009 | { | |
4010 | int mount_len = (to_posix | |
4011 | ? mount_table->mount[i].posix_pathlen | |
4012 | : mount_table->mount[i].native_pathlen); | |
4013 | if (max_mount_path_len < mount_len) | |
4014 | max_mount_path_len = mount_len; | |
4015 | } | |
1fd5e000 | 4016 | |
1870c688 CV |
4017 | /* 100: slop */ |
4018 | size = strlen (path_list) | |
4019 | + (num_elms * max_mount_path_len) | |
d2bd82aa | 4020 | + (nrel * strlen (to_posix ? pc.get_posix () : pc.get_win32 ())) |
1870c688 CV |
4021 | + 100; |
4022 | ||
4023 | return size; | |
4024 | } | |
4025 | ||
61522196 CV |
4026 | extern "C" ssize_t |
4027 | env_PATH_to_posix (const void *win32, void *posix, size_t size) | |
4028 | { | |
4029 | return_with_errno (conv_path_list ((const char *) win32, (char *) posix, | |
4030 | size, ENV_CVT)); | |
4031 | } | |
4032 | ||
76f06705 | 4033 | #ifdef __i386__ |
1870c688 CV |
4034 | |
4035 | extern "C" int | |
4036 | cygwin_win32_to_posix_path_list_buf_size (const char *path_list) | |
4037 | { | |
4038 | return conv_path_list_buf_size (path_list, true); | |
4039 | } | |
4040 | ||
4041 | extern "C" int | |
4042 | cygwin_posix_to_win32_path_list_buf_size (const char *path_list) | |
4043 | { | |
4044 | return conv_path_list_buf_size (path_list, false); | |
4045 | } | |
4046 | ||
1870c688 CV |
4047 | extern "C" int |
4048 | cygwin_win32_to_posix_path_list (const char *win32, char *posix) | |
4049 | { | |
a887cf0e CV |
4050 | return_with_errno (conv_path_list (win32, posix, MAX_PATH, |
4051 | CCP_WIN_A_TO_POSIX | CCP_RELATIVE)); | |
1870c688 CV |
4052 | } |
4053 | ||
4054 | extern "C" int | |
4055 | cygwin_posix_to_win32_path_list (const char *posix, char *win32) | |
4056 | { | |
a887cf0e CV |
4057 | return_with_errno (conv_path_list (posix, win32, MAX_PATH, |
4058 | CCP_POSIX_TO_WIN_A | CCP_RELATIVE)); | |
1870c688 CV |
4059 | } |
4060 | ||
76f06705 | 4061 | #endif /* __i386__ */ |
61522196 | 4062 | |
1870c688 CV |
4063 | extern "C" ssize_t |
4064 | cygwin_conv_path_list (cygwin_conv_path_t what, const void *from, void *to, | |
4065 | size_t size) | |
4066 | { | |
a887cf0e CV |
4067 | int ret; |
4068 | char *winp = NULL; | |
4069 | void *orig_to = NULL; | |
a887cf0e CV |
4070 | tmp_pathbuf tp; |
4071 | ||
4072 | switch (what & CCP_CONVTYPE_MASK) | |
1870c688 CV |
4073 | { |
4074 | case CCP_WIN_W_TO_POSIX: | |
a887cf0e CV |
4075 | if (!sys_wcstombs_alloc (&winp, HEAP_NOTHEAP, (const wchar_t *) from, |
4076 | (size_t) -1)) | |
4077 | return -1; | |
4078 | what = (what & ~CCP_CONVTYPE_MASK) | CCP_WIN_A_TO_POSIX; | |
4079 | from = (const void *) winp; | |
4080 | break; | |
1870c688 | 4081 | case CCP_POSIX_TO_WIN_W: |
a887cf0e CV |
4082 | if (size == 0) |
4083 | return conv_path_list_buf_size ((const char *) from, 0) | |
4084 | * sizeof (WCHAR); | |
4085 | what = (what & ~CCP_CONVTYPE_MASK) | CCP_POSIX_TO_WIN_A; | |
4086 | orig_to = to; | |
a887cf0e CV |
4087 | to = (void *) tp.w_get (); |
4088 | size = 65536; | |
1870c688 | 4089 | break; |
a887cf0e CV |
4090 | } |
4091 | switch (what & CCP_CONVTYPE_MASK) | |
4092 | { | |
1870c688 CV |
4093 | case CCP_WIN_A_TO_POSIX: |
4094 | case CCP_POSIX_TO_WIN_A: | |
4095 | if (size == 0) | |
4096 | return conv_path_list_buf_size ((const char *) from, | |
4097 | what == CCP_WIN_A_TO_POSIX); | |
a887cf0e CV |
4098 | ret = conv_path_list ((const char *) from, (char *) to, size, what); |
4099 | /* Free winp buffer in case of CCP_WIN_W_TO_POSIX. */ | |
4100 | if (winp) | |
d2ef2331 | 4101 | free (winp); |
a887cf0e CV |
4102 | /* Convert to WCHAR in case of CCP_POSIX_TO_WIN_W. */ |
4103 | if (orig_to) | |
4104 | sys_mbstowcs ((wchar_t *) orig_to, size / sizeof (WCHAR), | |
4105 | (const char *) to, (size_t) -1); | |
4106 | return_with_errno (ret); | |
1870c688 CV |
4107 | break; |
4108 | default: | |
4109 | break; | |
4110 | } | |
4111 | set_errno (EINVAL); | |
4112 | return -1; | |
4113 | } | |
4114 | ||
4115 | /* cygwin_split_path: Split a path into directory and file name parts. | |
4116 | Buffers DIR and FILE are assumed to be big enough. | |
4117 | ||
4118 | Examples (path -> `dir' / `file'): | |
4119 | / -> `/' / `' | |
4120 | "" -> `.' / `' | |
4121 | . -> `.' / `.' (FIXME: should this be `.' / `'?) | |
4122 | .. -> `.' / `..' (FIXME: should this be `..' / `'?) | |
4123 | foo -> `.' / `foo' | |
4124 | foo/bar -> `foo' / `bar' | |
4125 | foo/bar/ -> `foo' / `bar' | |
4126 | /foo -> `/' / `foo' | |
4127 | /foo/bar -> `/foo' / `bar' | |
4128 | c: -> `c:/' / `' | |
4129 | c:/ -> `c:/' / `' | |
4130 | c:foo -> `c:/' / `foo' | |
4131 | c:/foo -> `c:/' / `foo' | |
4132 | */ | |
4133 | ||
4134 | extern "C" void | |
4135 | cygwin_split_path (const char *path, char *dir, char *file) | |
4136 | { | |
4137 | int dir_started_p = 0; | |
4138 | ||
4139 | /* Deal with drives. | |
4140 | Remember that c:foo <==> c:/foo. */ | |
4141 | if (isdrive (path)) | |
4142 | { | |
4143 | *dir++ = *path++; | |
4144 | *dir++ = *path++; | |
4145 | *dir++ = '/'; | |
4146 | if (!*path) | |
4147 | { | |
4148 | *dir = 0; | |
4149 | *file = 0; | |
4150 | return; | |
4151 | } | |
4152 | if (isdirsep (*path)) | |
4153 | ++path; | |
4154 | dir_started_p = 1; | |
4155 | } | |
1fd5e000 | 4156 | |
1870c688 CV |
4157 | /* Determine if there are trailing slashes and "delete" them if present. |
4158 | We pretend as if they don't exist. */ | |
4159 | const char *end = path + strlen (path); | |
4160 | /* path + 1: keep leading slash. */ | |
4161 | while (end > path + 1 && isdirsep (end[-1])) | |
4162 | --end; | |
1fd5e000 | 4163 | |
1870c688 CV |
4164 | /* At this point, END points to one beyond the last character |
4165 | (with trailing slashes "deleted"). */ | |
1fd5e000 | 4166 | |
1870c688 CV |
4167 | /* Point LAST_SLASH at the last slash (duh...). */ |
4168 | const char *last_slash; | |
4169 | for (last_slash = end - 1; last_slash >= path; --last_slash) | |
4170 | if (isdirsep (*last_slash)) | |
4171 | break; | |
7e24f1bf | 4172 | |
1870c688 CV |
4173 | if (last_slash == path) |
4174 | { | |
4175 | *dir++ = '/'; | |
4176 | *dir = 0; | |
4177 | } | |
4178 | else if (last_slash > path) | |
4179 | { | |
4180 | memcpy (dir, path, last_slash - path); | |
4181 | dir[last_slash - path] = 0; | |
4182 | } | |
4183 | else | |
4184 | { | |
4185 | if (dir_started_p) | |
4186 | ; /* nothing to do */ | |
4187 | else | |
4188 | *dir++ = '.'; | |
4189 | *dir = 0; | |
4190 | } | |
09ecdc85 | 4191 | |
1870c688 CV |
4192 | memcpy (file, last_slash + 1, end - last_slash - 1); |
4193 | file[end - last_slash - 1] = 0; | |
4194 | } | |
4195 | ||
40187f90 CV |
4196 | static inline void |
4197 | copy_cwd_str (PUNICODE_STRING tgt, PUNICODE_STRING src) | |
4198 | { | |
4199 | RtlCopyUnicodeString (tgt, src); | |
4200 | if (tgt->Buffer[tgt->Length / sizeof (WCHAR) - 1] != L'\\') | |
4201 | { | |
4202 | tgt->Buffer[tgt->Length / sizeof (WCHAR)] = L'\\'; | |
4203 | tgt->Length += sizeof (WCHAR); | |
4204 | } | |
4205 | } | |
4206 | ||
1870c688 CV |
4207 | /*****************************************************************************/ |
4208 | ||
a413f8a2 | 4209 | /* The find_fast_cwd_pointer function and parts of the |
9c154abe CV |
4210 | cwdstuff::override_win32_cwd method are based on code using the |
4211 | following license: | |
4212 | ||
4213 | Copyright 2010 John Carey. All rights reserved. | |
4214 | ||
4215 | Redistribution and use in source and binary forms, with or without | |
4216 | modification, are permitted provided that the following conditions | |
4217 | are met: | |
4218 | ||
4219 | 1. Redistributions of source code must retain the above | |
4220 | copyright notice, this list of conditions and the following | |
4221 | disclaimer. | |
4222 | ||
4223 | 2. Redistributions in binary form must reproduce the above | |
4224 | copyright notice, this list of conditions and the following | |
4225 | disclaimer in the documentation and/or other materials provided | |
4226 | with the distribution. | |
4227 | ||
4228 | THIS SOFTWARE IS PROVIDED BY JOHN CAREY ``AS IS'' AND ANY EXPRESS | |
4229 | OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
4230 | WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
4231 | ARE DISCLAIMED. IN NO EVENT SHALL JOHN CAREY OR CONTRIBUTORS BE | |
4232 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
4233 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT | |
4234 | OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR | |
4235 | BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
4236 | LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
4237 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE | |
4238 | USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH | |
4239 | DAMAGE. */ | |
4240 | ||
a3904c65 CV |
4241 | void |
4242 | fcwd_access_t::SetFSCharacteristics (LONG val) | |
4243 | { | |
40187f90 | 4244 | /* Special case FSCharacteristics. Didn't exist originally. */ |
a3904c65 | 4245 | switch (fast_cwd_version ()) |
40187f90 | 4246 | { |
a3904c65 CV |
4247 | case FCWD_OLD: |
4248 | break; | |
4249 | case FCWD_W7: | |
4250 | f7.FSCharacteristics = val; | |
4251 | break; | |
4252 | case FCWD_W8: | |
4253 | f8.FSCharacteristics = val; | |
4254 | break; | |
40187f90 | 4255 | } |
a3904c65 CV |
4256 | } |
4257 | ||
4258 | fcwd_version_t & | |
4259 | fcwd_access_t::fast_cwd_version () | |
4260 | { | |
4261 | return cygheap->cwd.fast_cwd_version; | |
4262 | } | |
4263 | ||
4264 | void | |
4265 | fcwd_access_t::CopyPath (UNICODE_STRING &target) | |
4266 | { | |
4267 | /* Copy the Path contents over into the UNICODE_STRING referenced by | |
4268 | target. This is used to set the CurrentDirectoryName in the | |
4269 | user parameter block. */ | |
4270 | target = Path (); | |
4271 | } | |
4272 | ||
4273 | void | |
4274 | fcwd_access_t::Free (PVOID heap) | |
4275 | { | |
4276 | /* Decrement the reference count. If it's down to 0, free | |
4277 | structure from heap. */ | |
ffcef702 | 4278 | if (InterlockedDecrement (&ReferenceCount ()) == 0) |
40187f90 | 4279 | { |
ffcef702 CV |
4280 | /* The handle on init is always a fresh one, not the handle inherited |
4281 | from the parent process. We always have to close it here. | |
4282 | Note: The handle could be NULL, if we cd'ed into a virtual dir. */ | |
a3904c65 CV |
4283 | HANDLE h = DirectoryHandle (); |
4284 | if (h) | |
4285 | NtClose (h); | |
4286 | RtlFreeHeap (heap, 0, this); | |
40187f90 | 4287 | } |
a3904c65 CV |
4288 | } |
4289 | ||
4290 | void | |
4291 | fcwd_access_t::FillIn (HANDLE dir, PUNICODE_STRING name, | |
4292 | ULONG old_dismount_count) | |
4293 | { | |
4294 | /* Fill in all values into this FAST_CWD structure. */ | |
4295 | DirectoryHandle () = dir; | |
4296 | ReferenceCount () = 1; | |
4297 | OldDismountCount () = old_dismount_count; | |
4298 | /* The new structure stores the device characteristics of the | |
4299 | volume holding the dir. RtlGetCurrentDirectory_U checks | |
4300 | if the FILE_REMOVABLE_MEDIA flag is set and, if so, checks if | |
4301 | the volume is still the same as the one used when opening | |
4302 | the directory handle. | |
4303 | We don't call NtQueryVolumeInformationFile for the \\?\PIPE, | |
4304 | though. It just returns STATUS_INVALID_HANDLE anyway. */ | |
4305 | if (fast_cwd_version () != FCWD_OLD) | |
4306 | { | |
4307 | SetFSCharacteristics (0); | |
4308 | if (name != &ro_u_pipedir) | |
40187f90 | 4309 | { |
a3904c65 CV |
4310 | IO_STATUS_BLOCK io; |
4311 | FILE_FS_DEVICE_INFORMATION ffdi; | |
4312 | if (NT_SUCCESS (NtQueryVolumeInformationFile (dir, &io, &ffdi, | |
4313 | sizeof ffdi, FileFsDeviceInformation))) | |
4314 | SetFSCharacteristics (ffdi.Characteristics); | |
40187f90 | 4315 | } |
40187f90 | 4316 | } |
a3904c65 CV |
4317 | RtlInitEmptyUnicodeString (&Path (), Buffer (), |
4318 | MAX_PATH * sizeof (WCHAR)); | |
4319 | copy_cwd_str (&Path (), name); | |
4320 | } | |
40187f90 | 4321 | |
a3904c65 CV |
4322 | void |
4323 | fcwd_access_t::SetDirHandleFromBufferPointer (PWCHAR buf_p, HANDLE dir) | |
4324 | { | |
4325 | /* Input: The buffer pointer as it's stored in the user parameter block | |
4326 | and a directory handle. | |
4327 | This function computes the address to the FAST_CWD structure based | |
4328 | on the version and overwrites the directory handle. It is only | |
4329 | used if we couldn't figure out the address of fast_cwd_ptr. */ | |
4330 | fcwd_access_t *f_cwd; | |
4331 | switch (fast_cwd_version ()) | |
40187f90 | 4332 | { |
a3904c65 CV |
4333 | case FCWD_OLD: |
4334 | default: | |
4335 | f_cwd = (fcwd_access_t *) | |
4336 | ((PBYTE) buf_p - __builtin_offsetof (FAST_CWD_OLD, Buffer)); | |
b56179f8 | 4337 | break; |
a3904c65 CV |
4338 | case FCWD_W7: |
4339 | f_cwd = (fcwd_access_t *) | |
4340 | ((PBYTE) buf_p - __builtin_offsetof (FAST_CWD_7, Buffer)); | |
b56179f8 | 4341 | break; |
a3904c65 CV |
4342 | case FCWD_W8: |
4343 | f_cwd = (fcwd_access_t *) | |
4344 | ((PBYTE) buf_p - __builtin_offsetof (FAST_CWD_8, Buffer)); | |
b56179f8 | 4345 | break; |
40187f90 | 4346 | } |
a3904c65 CV |
4347 | f_cwd->DirectoryHandle () = dir; |
4348 | } | |
4349 | ||
4350 | void | |
4351 | fcwd_access_t::SetVersionFromPointer (PBYTE buf_p, bool is_buffer) | |
4352 | { | |
4353 | /* Given a pointer to the FAST_CWD structure (is_buffer == false) or a | |
4354 | pointer to the Buffer within (is_buffer == true), this function | |
4355 | computes the FAST_CWD version by checking that Path.MaximumLength | |
4356 | equals MAX_PATH, and that Path.Buffer == Buffer. */ | |
4357 | if (is_buffer) | |
4358 | buf_p -= __builtin_offsetof (FAST_CWD_8, Buffer); | |
4359 | fcwd_access_t *f_cwd = (fcwd_access_t *) buf_p; | |
4360 | if (f_cwd->f8.Path.MaximumLength == MAX_PATH * sizeof (WCHAR) | |
4361 | && f_cwd->f8.Path.Buffer == f_cwd->f8.Buffer) | |
4362 | fast_cwd_version () = FCWD_W8; | |
4363 | else if (f_cwd->f7.Path.MaximumLength == MAX_PATH * sizeof (WCHAR) | |
4364 | && f_cwd->f7.Path.Buffer == f_cwd->f7.Buffer) | |
4365 | fast_cwd_version () = FCWD_W7; | |
4366 | else | |
4367 | fast_cwd_version () = FCWD_OLD; | |
4368 | } | |
9c154abe | 4369 | |
9c154abe | 4370 | /* This function scans the code in ntdll.dll to find the address of the |
00e9bf2b CV |
4371 | global variable used to access the CWD. While the pointer is global, |
4372 | it's not exported from the DLL, unfortunately. Therefore we have to | |
4373 | use some knowledge to figure out the address. */ | |
61522196 CV |
4374 | |
4375 | #ifdef __x86_64__ | |
4376 | ||
4377 | #define peek32(x) (*(int32_t *)(x)) | |
4378 | ||
4379 | static fcwd_access_t ** | |
4380 | find_fast_cwd_pointer () | |
4381 | { | |
4382 | /* Fetch entry points of relevant functions in ntdll.dll. */ | |
4383 | HMODULE ntdll = GetModuleHandle ("ntdll.dll"); | |
4384 | if (!ntdll) | |
4385 | return NULL; | |
4386 | const uint8_t *get_dir = (const uint8_t *) | |
4387 | GetProcAddress (ntdll, "RtlGetCurrentDirectory_U"); | |
4388 | const uint8_t *ent_crit = (const uint8_t *) | |
4389 | GetProcAddress (ntdll, "RtlEnterCriticalSection"); | |
4390 | if (!get_dir || !ent_crit) | |
4391 | return NULL; | |
4392 | /* Search first relative call instruction in RtlGetCurrentDirectory_U. */ | |
e5cadbfd | 4393 | const uint8_t *rcall = (const uint8_t *) memchr (get_dir, 0xe8, 80); |
61522196 CV |
4394 | if (!rcall) |
4395 | return NULL; | |
4396 | /* Fetch offset from instruction and compute address of called function. | |
4397 | This function actually fetches the current FAST_CWD instance and | |
4398 | performs some other actions, not important to us. */ | |
4399 | const uint8_t *use_cwd = rcall + 5 + peek32 (rcall + 1); | |
4400 | /* Next we search for the locking mechanism and perform a sanity check. | |
4401 | On Pre-Windows 8 we basically look for the RtlEnterCriticalSection call. | |
4402 | Windows 8 does not call RtlEnterCriticalSection. The code manipulates | |
4403 | the FastPebLock manually, probably because RtlEnterCriticalSection has | |
4404 | been converted to an inline function. Either way, we test if the code | |
4405 | uses the FastPebLock. */ | |
4406 | const uint8_t *movrbx; | |
4407 | const uint8_t *lock = (const uint8_t *) | |
4408 | memmem ((const char *) use_cwd, 80, | |
4409 | "\xf0\x0f\xba\x35", 4); | |
4410 | if (lock) | |
4411 | { | |
4412 | /* The lock instruction tweaks the LockCount member, which is not at | |
d2ef2331 | 4413 | the start of the PRTL_CRITICAL_SECTION structure. So we have to |
61522196 CV |
4414 | subtract the offset of LockCount to get the real address. */ |
4415 | PRTL_CRITICAL_SECTION lockaddr = | |
4416 | (PRTL_CRITICAL_SECTION) (lock + 9 + peek32 (lock + 4) | |
4417 | - offsetof (RTL_CRITICAL_SECTION, LockCount)); | |
4418 | /* Test if lock address is FastPebLock. */ | |
4419 | if (lockaddr != NtCurrentTeb ()->Peb->FastPebLock) | |
4420 | return NULL; | |
562b70fb | 4421 | /* Search `mov rel(%rip),%rbx'. This is the instruction fetching the |
61522196 CV |
4422 | address of the current fcwd_access_t pointer, and it should be pretty |
4423 | near to the locking stuff. */ | |
4424 | movrbx = (const uint8_t *) memmem ((const char *) lock, 40, | |
4425 | "\x48\x8b\x1d", 3); | |
4426 | } | |
4427 | else | |
4428 | { | |
562b70fb CV |
4429 | /* Usually the callq RtlEnterCriticalSection follows right after |
4430 | fetching the lock address. */ | |
4431 | int call_rtl_offset = 7; | |
4432 | /* Search `lea rel(%rip),%rcx'. This loads the address of the lock into | |
4433 | %rcx for the subsequent RtlEnterCriticalSection call. */ | |
61522196 CV |
4434 | lock = (const uint8_t *) memmem ((const char *) use_cwd, 80, |
4435 | "\x48\x8d\x0d", 3); | |
4436 | if (!lock) | |
562b70fb CV |
4437 | { |
4438 | /* Windows 8.1 Preview calls `lea rel(rip),%r12' then some unrelated | |
4439 | or, then `mov %r12,%rcx', then `callq RtlEnterCriticalSection'. */ | |
4440 | lock = (const uint8_t *) memmem ((const char *) use_cwd, 80, | |
4441 | "\x4c\x8d\x25", 3); | |
4442 | if (!lock) | |
4443 | return NULL; | |
4444 | call_rtl_offset = 14; | |
4445 | } | |
61522196 CV |
4446 | PRTL_CRITICAL_SECTION lockaddr = |
4447 | (PRTL_CRITICAL_SECTION) (lock + 7 + peek32 (lock + 3)); | |
4448 | /* Test if lock address is FastPebLock. */ | |
4449 | if (lockaddr != NtCurrentTeb ()->Peb->FastPebLock) | |
4450 | return NULL; | |
562b70fb CV |
4451 | /* Next is the `callq RtlEnterCriticalSection'. */ |
4452 | lock += call_rtl_offset; | |
61522196 CV |
4453 | if (lock[0] != 0xe8) |
4454 | return NULL; | |
4455 | const uint8_t *call_addr = (const uint8_t *) | |
4456 | (lock + 5 + peek32 (lock + 1)); | |
4457 | if (call_addr != ent_crit) | |
4458 | return NULL; | |
4459 | /* In contrast to the above Windows 8 code, we don't have to search | |
562b70fb | 4460 | for the `mov rel(%rip),%rbx' instruction. It follows right after |
61522196 CV |
4461 | the call to RtlEnterCriticalSection. */ |
4462 | movrbx = lock + 5; | |
4463 | } | |
4464 | if (!movrbx) | |
4465 | return NULL; | |
4466 | /* Check that the next instruction tests if the fetched value is NULL. */ | |
4467 | const uint8_t *testrbx = (const uint8_t *) | |
4468 | memmem (movrbx + 7, 3, "\x48\x85\xdb", 3); | |
4469 | if (!testrbx) | |
4470 | return NULL; | |
4471 | /* Compute address of the fcwd_access_t ** pointer. */ | |
4472 | return (fcwd_access_t **) (testrbx + peek32 (movrbx + 3)); | |
4473 | } | |
4474 | #else | |
4475 | ||
4476 | #define peek32(x) (*(uint32_t *)(x)) | |
4477 | ||
40187f90 | 4478 | static fcwd_access_t ** |
a413f8a2 | 4479 | find_fast_cwd_pointer () |
9c154abe | 4480 | { |
9c154abe CV |
4481 | /* Fetch entry points of relevant functions in ntdll.dll. */ |
4482 | HMODULE ntdll = GetModuleHandle ("ntdll.dll"); | |
4483 | if (!ntdll) | |
a413f8a2 | 4484 | return NULL; |
9c154abe CV |
4485 | const uint8_t *get_dir = (const uint8_t *) |
4486 | GetProcAddress (ntdll, "RtlGetCurrentDirectory_U"); | |
4487 | const uint8_t *ent_crit = (const uint8_t *) | |
4488 | GetProcAddress (ntdll, "RtlEnterCriticalSection"); | |
4489 | if (!get_dir || !ent_crit) | |
a413f8a2 | 4490 | return NULL; |
9c154abe | 4491 | /* Search first relative call instruction in RtlGetCurrentDirectory_U. */ |
e5cadbfd | 4492 | const uint8_t *rcall = (const uint8_t *) memchr (get_dir, 0xe8, 64); |
9c154abe | 4493 | if (!rcall) |
a413f8a2 | 4494 | return NULL; |
9c154abe CV |
4495 | /* Fetch offset from instruction and compute address of called function. |
4496 | This function actually fetches the current FAST_CWD instance and | |
4497 | performs some other actions, not important to us. */ | |
4498 | ptrdiff_t offset = (ptrdiff_t) peek32 (rcall + 1); | |
4499 | const uint8_t *use_cwd = rcall + 5 + offset; | |
562b70fb | 4500 | /* Find first `push %edi' instruction. */ |
9c154abe | 4501 | const uint8_t *pushedi = (const uint8_t *) memchr (use_cwd, 0x57, 32); |
4ddf5903 AL |
4502 | if (!pushedi) |
4503 | return NULL; | |
562b70fb CV |
4504 | /* ...which should be followed by `mov crit-sect-addr,%edi' then |
4505 | `push %edi', or by just a single `push crit-sect-addr'. */ | |
9c154abe | 4506 | const uint8_t *movedi = pushedi + 1; |
2d487f2d | 4507 | const uint8_t *mov_pfast_cwd; |
562b70fb | 4508 | if (movedi[0] == 0x8b && movedi[1] == 0xff) /* mov %edi,%edi -> W8 */ |
2d487f2d | 4509 | { |
61522196 | 4510 | /* Windows 8 does not call RtlEnterCriticalSection. The code manipulates |
d2ef2331 | 4511 | the FastPebLock manually, probably because RtlEnterCriticalSection has |
2d487f2d CV |
4512 | been converted to an inline function. |
4513 | ||
562b70fb | 4514 | Next we search for a `mov some address,%eax'. This address points |
2d487f2d CV |
4515 | to the LockCount member of the FastPebLock structure, so the address |
4516 | is equal to FastPebLock + 4. */ | |
4517 | const uint8_t *moveax = (const uint8_t *) memchr (movedi, 0xb8, 16); | |
4518 | if (!moveax) | |
4519 | return NULL; | |
4520 | offset = (ptrdiff_t) peek32 (moveax + 1) - 4; | |
4521 | /* Compare the address with the known PEB lock as stored in the PEB. */ | |
4522 | if ((PRTL_CRITICAL_SECTION) offset != NtCurrentTeb ()->Peb->FastPebLock) | |
4523 | return NULL; | |
4524 | /* Now search for the mov instruction fetching the address of the global | |
4525 | PFAST_CWD *. */ | |
4526 | mov_pfast_cwd = moveax; | |
4527 | do | |
4528 | { | |
4529 | mov_pfast_cwd = (const uint8_t *) memchr (++mov_pfast_cwd, 0x8b, 48); | |
4530 | } | |
4531 | while (mov_pfast_cwd && mov_pfast_cwd[1] != 0x1d | |
4532 | && (mov_pfast_cwd - moveax) < 48); | |
4533 | if (!mov_pfast_cwd || mov_pfast_cwd[1] != 0x1d) | |
4534 | return NULL; | |
4535 | } | |
76173acf | 4536 | else |
2d487f2d CV |
4537 | { |
4538 | if (movedi[0] == 0xbf && movedi[5] == 0x57) | |
4539 | rcall = movedi + 6; | |
4540 | else if (movedi[0] == 0x68) | |
4541 | rcall = movedi + 5; | |
562b70fb CV |
4542 | else if (movedi[0] == 0x88 && movedi[4] == 0x83 && movedi[7] == 0x68) |
4543 | { | |
4544 | /* Windows 8.1 Preview: The `mov lock_addr,%edi' is actually a | |
4545 | `mov %cl,15(%esp), followed by an `or #-1,%ebx, followed by a | |
4546 | `push lock_addr'. */ | |
4547 | movedi += 7; | |
4548 | rcall = movedi + 5; | |
4549 | } | |
2d487f2d CV |
4550 | else |
4551 | return NULL; | |
4552 | /* Compare the address used for the critical section with the known | |
4553 | PEB lock as stored in the PEB. */ | |
4554 | if ((PRTL_CRITICAL_SECTION) peek32 (movedi + 1) | |
4555 | != NtCurrentTeb ()->Peb->FastPebLock) | |
4556 | return NULL; | |
4557 | /* To check we are seeing the right code, we check our expectation that | |
4558 | the next instruction is a relative call into RtlEnterCriticalSection. */ | |
4559 | if (rcall[0] != 0xe8) | |
4560 | return NULL; | |
4561 | /* Check that this is a relative call to RtlEnterCriticalSection. */ | |
4562 | offset = (ptrdiff_t) peek32 (rcall + 1); | |
4563 | if (rcall + 5 + offset != ent_crit) | |
4564 | return NULL; | |
4565 | mov_pfast_cwd = rcall + 5; | |
4566 | } | |
9c154abe CV |
4567 | /* After locking the critical section, the code should read the global |
4568 | PFAST_CWD * pointer that is guarded by that critical section. */ | |
2d487f2d | 4569 | if (mov_pfast_cwd[0] != 0x8b) |
a413f8a2 | 4570 | return NULL; |
2d487f2d | 4571 | return (fcwd_access_t **) peek32 (mov_pfast_cwd + 2); |
9c154abe | 4572 | } |
61522196 | 4573 | #endif |
9c154abe | 4574 | |
40187f90 | 4575 | static fcwd_access_t ** |
a413f8a2 CV |
4576 | find_fast_cwd () |
4577 | { | |
4578 | /* Fetch the pointer but don't set the global fast_cwd_ptr yet. First | |
4579 | we have to make sure we know the version of the FAST_CWD structure | |
4580 | used on the system. */ | |
40187f90 | 4581 | fcwd_access_t **f_cwd_ptr = find_fast_cwd_pointer (); |
a413f8a2 | 4582 | if (!f_cwd_ptr) |
a4f1f59b | 4583 | { |
5ed8f235 CV |
4584 | bool warn = 1; |
4585 | ||
a4f1f59b | 4586 | #ifndef __x86_64__ |
5ed8f235 CV |
4587 | #ifndef PROCESSOR_ARCHITECTURE_ARM64 |
4588 | #define PROCESSOR_ARCHITECTURE_ARM64 12 | |
4589 | #endif | |
4590 | ||
a4f1f59b CV |
4591 | SYSTEM_INFO si; |
4592 | ||
4593 | /* Check if we're running in WOW64 on ARM64. Skip the warning as long as | |
5ed8f235 CV |
4594 | there's no solution for finding the FAST_CWD pointer on that system. |
4595 | ||
4596 | 2018-07-12: Apparently current ARM64 WOW64 has a bug: | |
4597 | It's GetNativeSystemInfo returns PROCESSOR_ARCHITECTURE_INTEL in | |
4598 | wProcessorArchitecture. Since that's an invalid value (a 32 bit | |
4599 | host system hosting a 32 bit emulator for itself?) we can use this | |
4600 | value as an indicator to skip the message as well. */ | |
4601 | if (wincap.is_wow64 ()) | |
4602 | { | |
4603 | GetNativeSystemInfo (&si); | |
4604 | if (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_ARM64 | |
4605 | || si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_INTEL) | |
4606 | warn = 0; | |
4607 | } | |
4608 | #endif /* !__x86_64__ */ | |
4609 | ||
4610 | if (warn) | |
4611 | small_printf ("Cygwin WARNING:\n" | |
0793492d CV |
4612 | " Couldn't compute FAST_CWD pointer. This typically occurs if you're using\n" |
4613 | " an older Cygwin version on a newer Windows. Please update to the latest\n" | |
4614 | " available Cygwin version from https://cygwin.com/. If the problem persists,\n" | |
21f22726 | 4615 | " please see https://cygwin.com/problems.html\n\n"); |
a4f1f59b | 4616 | } |
a413f8a2 CV |
4617 | if (f_cwd_ptr && *f_cwd_ptr) |
4618 | { | |
40187f90 CV |
4619 | /* Just evaluate structure version. */ |
4620 | fcwd_access_t::SetVersionFromPointer ((PBYTE) *f_cwd_ptr, false); | |
a413f8a2 CV |
4621 | } |
4622 | else | |
4623 | { | |
53609fd2 CV |
4624 | /* If we couldn't fetch fast_cwd_ptr, or if fast_cwd_ptr is NULL(*) |
4625 | we have to figure out the version from the Buffer pointer in the | |
4626 | ProcessParameters. | |
1b23b30b | 4627 | |
53609fd2 CV |
4628 | (*) This is very unlikely to happen when starting the first |
4629 | Cygwin process, since it only happens when starting the | |
4630 | process in a directory which can't be used as CWD by Win32, or | |
4631 | if the directory doesn't exist. But *if* it happens, we have | |
4632 | no valid FAST_CWD structure, even though upp_cwd_str.Buffer is | |
4633 | not NULL in that case. So we let the OS create a valid | |
4634 | FAST_CWD structure temporarily to have something to work with. | |
4635 | We know the pipe FS works. */ | |
a413f8a2 CV |
4636 | PEB &peb = *NtCurrentTeb ()->Peb; |
4637 | ||
4638 | if (f_cwd_ptr /* so *f_cwd_ptr == NULL */ | |
b86f999a | 4639 | && !NT_SUCCESS (RtlSetCurrentDirectory_U (&ro_u_pipedir))) |
a413f8a2 CV |
4640 | api_fatal ("Couldn't set directory to %S temporarily.\n" |
4641 | "Cannot continue.", &ro_u_pipedir); | |
4642 | RtlEnterCriticalSection (peb.FastPebLock); | |
40187f90 CV |
4643 | fcwd_access_t::SetVersionFromPointer |
4644 | ((PBYTE) peb.ProcessParameters->CurrentDirectoryName.Buffer, true); | |
a413f8a2 CV |
4645 | RtlLeaveCriticalSection (peb.FastPebLock); |
4646 | } | |
4647 | /* Eventually, after we set the version as well, set fast_cwd_ptr. */ | |
4648 | return f_cwd_ptr; | |
4649 | } | |
4650 | ||
9c154abe CV |
4651 | void |
4652 | cwdstuff::override_win32_cwd (bool init, ULONG old_dismount_count) | |
4653 | { | |
9c154abe CV |
4654 | HANDLE h = NULL; |
4655 | ||
4656 | PEB &peb = *NtCurrentTeb ()->Peb; | |
4657 | UNICODE_STRING &upp_cwd_str = peb.ProcessParameters->CurrentDirectoryName; | |
4658 | HANDLE &upp_cwd_hdl = peb.ProcessParameters->CurrentDirectoryHandle; | |
4659 | ||
ffcef702 CV |
4660 | if (fast_cwd_ptr == (fcwd_access_t **) -1) |
4661 | fast_cwd_ptr = find_fast_cwd (); | |
4662 | if (fast_cwd_ptr) | |
9c154abe | 4663 | { |
00e9bf2b CV |
4664 | /* If we got a valid value for fast_cwd_ptr, we can simply replace |
4665 | the RtlSetCurrentDirectory_U function entirely. */ | |
ffcef702 CV |
4666 | PVOID heap = peb.ProcessHeap; |
4667 | /* First allocate a new fcwd_access_t structure on the heap. | |
4668 | The new fcwd_access_t structure is 4 byte bigger than the old one, | |
4669 | but we simply don't care, so we allocate always room for the | |
4670 | new one. */ | |
4671 | fcwd_access_t *f_cwd = (fcwd_access_t *) | |
4672 | RtlAllocateHeap (heap, 0, sizeof (fcwd_access_t)); | |
4673 | if (!f_cwd) | |
9c154abe | 4674 | { |
ffcef702 CV |
4675 | debug_printf ("RtlAllocateHeap failed"); |
4676 | return; | |
9c154abe | 4677 | } |
ffcef702 CV |
4678 | /* Fill in the values. */ |
4679 | f_cwd->FillIn (dir, error ? &ro_u_pipedir : &win32, | |
4680 | old_dismount_count); | |
4681 | /* Use PEB lock when switching fast_cwd_ptr to the new FAST_CWD | |
4682 | structure and writing the CWD to the user process parameter | |
4683 | block. This is equivalent to calling RtlAcquirePebLock/ | |
4684 | RtlReleasePebLock, but without having to go through the FS | |
4685 | selector again. */ | |
4686 | RtlEnterCriticalSection (peb.FastPebLock); | |
4687 | fcwd_access_t *old_cwd = *fast_cwd_ptr; | |
4688 | *fast_cwd_ptr = f_cwd; | |
4689 | f_cwd->CopyPath (upp_cwd_str); | |
4690 | upp_cwd_hdl = dir; | |
4691 | RtlLeaveCriticalSection (peb.FastPebLock); | |
4692 | if (old_cwd) | |
4693 | old_cwd->Free (heap); | |
9c154abe CV |
4694 | } |
4695 | else | |
4696 | { | |
698d93c4 | 4697 | /* Fallback if we failed to find the fast_cwd_ptr value: |
ffcef702 | 4698 | |
698d93c4 CV |
4699 | - Call RtlSetCurrentDirectory_U. |
4700 | - Compute new FAST_CWD struct address from buffer pointer in the | |
4701 | user process parameter block. | |
4702 | - Replace the directory handle in the struct with our own handle. | |
4703 | - Close the original handle. RtlSetCurrentDirectory_U already | |
4704 | closed our former dir handle -> no handle leak. | |
ffcef702 | 4705 | |
698d93c4 CV |
4706 | Guard the entire operation with FastPebLock to avoid races |
4707 | accessing the PEB and FAST_CWD struct. | |
ffcef702 | 4708 | |
698d93c4 CV |
4709 | Unfortunately this method is still prone to a directory usage |
4710 | race condition: | |
ffcef702 | 4711 | |
698d93c4 CV |
4712 | - The directory is locked against deletion or renaming between the |
4713 | RtlSetCurrentDirectory_U and the subsequent NtClose call. */ | |
4714 | if (unlikely (upp_cwd_hdl == NULL) && init) | |
4715 | return; | |
4716 | RtlEnterCriticalSection (peb.FastPebLock); | |
9c154abe | 4717 | if (!init) |
ffcef702 CV |
4718 | { |
4719 | NTSTATUS status = | |
4720 | RtlSetCurrentDirectory_U (error ? &ro_u_pipedir : &win32); | |
4721 | if (!NT_SUCCESS (status)) | |
4722 | { | |
698d93c4 | 4723 | RtlLeaveCriticalSection (peb.FastPebLock); |
ffcef702 CV |
4724 | debug_printf ("RtlSetCurrentDirectory_U(%S) failed, %y", |
4725 | error ? &ro_u_pipedir : &win32, status); | |
4726 | return; | |
4727 | } | |
4728 | } | |
ffcef702 | 4729 | fcwd_access_t::SetDirHandleFromBufferPointer(upp_cwd_str.Buffer, dir); |
9c154abe CV |
4730 | h = upp_cwd_hdl; |
4731 | upp_cwd_hdl = dir; | |
ffcef702 CV |
4732 | RtlLeaveCriticalSection (peb.FastPebLock); |
4733 | /* The handle on init is always a fresh one, not the handle inherited | |
4734 | from the parent process. We always have to close it here. */ | |
4735 | NtClose (h); | |
9c154abe | 4736 | } |
1870c688 CV |
4737 | } |
4738 | ||
4739 | /* Initialize cygcwd 'muto' for serializing access to cwd info. */ | |
4740 | void | |
4741 | cwdstuff::init () | |
4742 | { | |
4743 | cwd_lock.init ("cwd_lock"); | |
260b8074 CV |
4744 | |
4745 | /* Cygwin processes inherit the cwd from their parent. If the win32 path | |
9c154abe CV |
4746 | buffer is not NULL, the cwd struct is already set up, and we only |
4747 | have to override the Win32 CWD with ours. */ | |
260b8074 | 4748 | if (win32.Buffer) |
9c154abe CV |
4749 | override_win32_cwd (true, SharedUserData.DismountCount); |
4750 | else | |
a3904c65 CV |
4751 | { |
4752 | /* Initialize fast_cwd stuff. */ | |
4753 | fast_cwd_ptr = (fcwd_access_t **) -1; | |
4754 | fast_cwd_version = FCWD_W7; | |
4755 | /* Initially re-open the cwd to allow POSIX semantics. */ | |
4756 | set (NULL, NULL); | |
4757 | } | |
1870c688 CV |
4758 | } |
4759 | ||
4760 | /* Chdir and fill out the elements of a cwdstuff struct. */ | |
4761 | int | |
260b8074 | 4762 | cwdstuff::set (path_conv *nat_cwd, const char *posix_cwd) |
1870c688 | 4763 | { |
1121c57f | 4764 | NTSTATUS status; |
1870c688 | 4765 | UNICODE_STRING upath; |
9c154abe | 4766 | PEB &peb = *NtCurrentTeb ()->Peb; |
260b8074 CV |
4767 | bool virtual_path = false; |
4768 | bool unc_path = false; | |
4769 | bool inaccessible_path = false; | |
4770 | ||
1121c57f CV |
4771 | /* Here are the problems with using SetCurrentDirectory. Just skip this |
4772 | comment if you don't like whining. | |
b86f999a | 4773 | |
260b8074 CV |
4774 | - SetCurrentDirectory only supports paths of up to MAX_PATH - 1 chars, |
4775 | including a trailing backslash. That's an absolute restriction, even | |
4776 | in the UNICODE API. | |
4777 | ||
1121c57f CV |
4778 | - SetCurrentDirectory fails for directories with strict permissions even |
4779 | for processes with the SE_BACKUP_NAME privilege enabled. The reason | |
4780 | is apparently that SetCurrentDirectory calls NtOpenFile without the | |
260b8074 CV |
4781 | FILE_OPEN_FOR_BACKUP_INTENT flag set. |
4782 | ||
4783 | - SetCurrentDirectory does not support case-sensitivity. | |
4784 | ||
1121c57f CV |
4785 | - Unlinking a cwd fails because SetCurrentDirectory seems to open |
4786 | directories so that deleting the directory is disallowed. | |
260b8074 CV |
4787 | |
4788 | - SetCurrentDirectory can naturally not work on virtual Cygwin paths | |
4789 | like /proc or /cygdrive. | |
4790 | ||
1121c57f CV |
4791 | Nevertheless, doing entirely without SetCurrentDirectory is not really |
4792 | feasible, because it breaks too many mixed applications using the Win32 | |
4793 | API. | |
4794 | ||
4795 | Therefore we handle the CWD all by ourselves and just keep the Win32 | |
4796 | CWD in sync. However, to avoid surprising behaviour in the Win32 API | |
4797 | when we are in a CWD which is inaccessible as Win32 CWD, we set the | |
4798 | Win32 CWD to a "weird" directory in which all relative filesystem-related | |
4799 | calls fail. */ | |
1870c688 CV |
4800 | |
4801 | cwd_lock.acquire (); | |
4802 | ||
4803 | if (nat_cwd) | |
4804 | { | |
260b8074 CV |
4805 | upath = *nat_cwd->get_nt_native_path (); |
4806 | if (nat_cwd->isspecial ()) | |
4807 | virtual_path = true; | |
1870c688 | 4808 | } |
09ecdc85 | 4809 | |
9c154abe | 4810 | /* Memorize old DismountCount before opening the dir. This value is |
00e9bf2b CV |
4811 | stored in the FAST_CWD structure. It would be simpler to fetch the |
4812 | old DismountCount in override_win32_cwd, but Windows also fetches | |
4813 | it before opening the directory handle. It's not quite clear if | |
4814 | that's really required, but since we don't know the side effects of | |
4815 | this action, we better follow Windows' lead. */ | |
9c154abe | 4816 | ULONG old_dismount_count = SharedUserData.DismountCount; |
260b8074 CV |
4817 | /* Open a directory handle with FILE_OPEN_FOR_BACKUP_INTENT and with all |
4818 | sharing flags set. The handle is right now used in exceptions.cc only, | |
4819 | but that might change in future. */ | |
75a3b858 | 4820 | HANDLE h = NULL; |
260b8074 | 4821 | if (!virtual_path) |
1870c688 | 4822 | { |
1870c688 CV |
4823 | IO_STATUS_BLOCK io; |
4824 | OBJECT_ATTRIBUTES attr; | |
260b8074 CV |
4825 | |
4826 | if (!nat_cwd) | |
4827 | { | |
4828 | /* On init, just reopen Win32 CWD with desired access flags. | |
4829 | We can access the PEB without lock, because no other thread | |
88443b0a CV |
4830 | can change the CWD. However, there's a chance that the handle |
4831 | is NULL, even though CurrentDirectoryName isn't so we have to | |
4832 | be careful. */ | |
4833 | if (!peb.ProcessParameters->CurrentDirectoryHandle) | |
4834 | { | |
4835 | InitializeObjectAttributes (&attr, | |
4836 | &peb.ProcessParameters->CurrentDirectoryName, | |
4837 | OBJ_CASE_INSENSITIVE | OBJ_INHERIT, NULL, NULL); | |
4838 | } | |
4839 | else | |
4840 | { | |
4841 | RtlInitUnicodeString (&upath, L""); | |
4842 | InitializeObjectAttributes (&attr, | |
4843 | &upath, OBJ_CASE_INSENSITIVE | OBJ_INHERIT, | |
4844 | peb.ProcessParameters->CurrentDirectoryHandle, | |
4845 | NULL); | |
4846 | } | |
260b8074 CV |
4847 | } |
4848 | else | |
4849 | InitializeObjectAttributes (&attr, &upath, | |
4850 | nat_cwd->objcaseinsensitive () | OBJ_INHERIT, | |
4851 | NULL, NULL); | |
4852 | /* First try without FILE_OPEN_FOR_BACKUP_INTENT, to find out if the | |
b86f999a | 4853 | directory is valid for Win32 apps. And, no, we can't just call |
1121c57f CV |
4854 | SetCurrentDirectory here, since that would potentially break |
4855 | case-sensitivity. */ | |
1870c688 CV |
4856 | status = NtOpenFile (&h, SYNCHRONIZE | FILE_TRAVERSE, &attr, &io, |
4857 | FILE_SHARE_VALID_FLAGS, | |
4858 | FILE_DIRECTORY_FILE | |
260b8074 CV |
4859 | | FILE_SYNCHRONOUS_IO_NONALERT); |
4860 | if (status == STATUS_ACCESS_DENIED) | |
b86f999a | 4861 | { |
260b8074 CV |
4862 | status = NtOpenFile (&h, SYNCHRONIZE | FILE_TRAVERSE, &attr, &io, |
4863 | FILE_SHARE_VALID_FLAGS, | |
4864 | FILE_DIRECTORY_FILE | |
4865 | | FILE_SYNCHRONOUS_IO_NONALERT | |
4866 | | FILE_OPEN_FOR_BACKUP_INTENT); | |
4867 | inaccessible_path = true; | |
4868 | } | |
1870c688 CV |
4869 | if (!NT_SUCCESS (status)) |
4870 | { | |
88443b0a CV |
4871 | /* Called from chdir? Just fail. */ |
4872 | if (nat_cwd) | |
4873 | { | |
4874 | cwd_lock.release (); | |
4875 | __seterrno_from_nt_status (status); | |
4876 | return -1; | |
4877 | } | |
4878 | /* Otherwise we're in init and posix hasn't been set yet. Try to | |
4879 | duplicate the handle instead. If that fails, too, set dir to NULL | |
4880 | and carry on. This will at least set posix to some valid path at | |
4881 | process startup, and subsequent getcwd calls don't EFAULT. */ | |
4882 | debug_printf ("WARNING: Can't reopen CWD %y '%S', status %y", | |
4883 | peb.ProcessParameters->CurrentDirectoryHandle, | |
4884 | &peb.ProcessParameters->CurrentDirectoryName, | |
4885 | status); | |
4886 | if (!peb.ProcessParameters->CurrentDirectoryHandle | |
4887 | || !DuplicateHandle (GetCurrentProcess (), | |
4888 | peb.ProcessParameters->CurrentDirectoryHandle, | |
4889 | GetCurrentProcess (), &h, 0, TRUE, 0)) | |
4890 | { | |
4891 | cwd_lock.release (); | |
4892 | if (peb.ProcessParameters->CurrentDirectoryHandle) | |
4893 | debug_printf ("...and DuplicateHandle failed with %E."); | |
4894 | dir = NULL; | |
4895 | } | |
1870c688 | 4896 | } |
260b8074 | 4897 | } |
9c154abe CV |
4898 | /* Set new handle. Note that we simply overwrite the old handle here |
4899 | without closing it. The handle is also used as Win32 CWD handle in | |
4900 | the user parameter block, and it will be closed in override_win32_cwd, | |
4901 | if required. */ | |
75a3b858 | 4902 | dir = h; |
260b8074 CV |
4903 | |
4904 | if (!nat_cwd) | |
4905 | { | |
4906 | /* On init, just fetch the Win32 dir from the PEB. We can access | |
4907 | the PEB without lock, because no other thread can change the CWD | |
4908 | at that time. */ | |
9c154abe | 4909 | PUNICODE_STRING pdir = &peb.ProcessParameters->CurrentDirectoryName; |
260b8074 CV |
4910 | RtlInitEmptyUnicodeString (&win32, |
4911 | (PWCHAR) crealloc_abort (win32.Buffer, | |
b53c1929 CV |
4912 | pdir->Length |
4913 | + sizeof (WCHAR)), | |
4914 | pdir->Length + sizeof (WCHAR)); | |
260b8074 CV |
4915 | RtlCopyUnicodeString (&win32, pdir); |
4916 | ||
4917 | PWSTR eoBuffer = win32.Buffer + (win32.Length / sizeof (WCHAR)); | |
4918 | /* Remove trailing slash if one exists. */ | |
4919 | if ((eoBuffer - win32.Buffer) > 3 && eoBuffer[-1] == L'\\') | |
4920 | win32.Length -= sizeof (WCHAR); | |
4921 | if (eoBuffer[0] == L'\\') | |
4922 | unc_path = true; | |
4923 | ||
4924 | posix_cwd = NULL; | |
260b8074 CV |
4925 | } |
4926 | else | |
4927 | { | |
a413f8a2 | 4928 | if (!virtual_path) /* don't mangle virtual path. */ |
1870c688 | 4929 | { |
a413f8a2 CV |
4930 | /* Convert into Win32 path and compute length. */ |
4931 | if (upath.Buffer[1] == L'?') | |
260b8074 | 4932 | { |
a413f8a2 CV |
4933 | upath.Buffer += 4; |
4934 | upath.Length -= 4 * sizeof (WCHAR); | |
4935 | if (upath.Buffer[1] != L':') | |
4936 | { | |
4937 | /* UNC path */ | |
4938 | upath.Buffer += 2; | |
4939 | upath.Length -= 2 * sizeof (WCHAR); | |
4940 | unc_path = true; | |
4941 | } | |
4942 | } | |
4943 | else | |
4944 | { | |
4945 | /* Path via native NT namespace. Prepend GLOBALROOT prefix | |
b86f999a | 4946 | to create a valid Win32 path. */ |
a413f8a2 CV |
4947 | PWCHAR buf = (PWCHAR) alloca (upath.Length |
4948 | + ro_u_globalroot.Length | |
4949 | + sizeof (WCHAR)); | |
4950 | wcpcpy (wcpcpy (buf, ro_u_globalroot.Buffer), upath.Buffer); | |
4951 | upath.Buffer = buf; | |
4952 | upath.Length += ro_u_globalroot.Length; | |
260b8074 | 4953 | } |
260b8074 CV |
4954 | PWSTR eoBuffer = upath.Buffer + (upath.Length / sizeof (WCHAR)); |
4955 | /* Remove trailing slash if one exists. */ | |
4956 | if ((eoBuffer - upath.Buffer) > 3 && eoBuffer[-1] == L'\\') | |
4957 | upath.Length -= sizeof (WCHAR); | |
4958 | } | |
4959 | RtlInitEmptyUnicodeString (&win32, | |
4960 | (PWCHAR) crealloc_abort (win32.Buffer, | |
b53c1929 CV |
4961 | upath.Length |
4962 | + sizeof (WCHAR)), | |
4963 | upath.Length + sizeof (WCHAR)); | |
260b8074 CV |
4964 | RtlCopyUnicodeString (&win32, &upath); |
4965 | if (unc_path) | |
4966 | win32.Buffer[0] = L'\\'; | |
4967 | } | |
4968 | /* Make sure it's NUL-terminated. */ | |
4969 | win32.Buffer[win32.Length / sizeof (WCHAR)] = L'\0'; | |
4970 | ||
4971 | /* Set drive_length, used in path conversion, and error code, used in | |
4972 | spawn_guts to decide whether a native Win32 app can be started or not. */ | |
4973 | if (virtual_path) | |
4974 | { | |
4975 | drive_length = 0; | |
4976 | error = ENOTDIR; | |
1870c688 | 4977 | } |
260b8074 | 4978 | else |
1870c688 | 4979 | { |
260b8074 | 4980 | if (!unc_path) |
1870c688 | 4981 | drive_length = 2; |
260b8074 | 4982 | else |
1870c688 CV |
4983 | { |
4984 | PWCHAR ptr = wcschr (win32.Buffer + 2, L'\\'); | |
4985 | if (ptr) | |
4986 | ptr = wcschr (ptr + 1, L'\\'); | |
4987 | if (ptr) | |
4988 | drive_length = ptr - win32.Buffer; | |
4989 | else | |
4990 | drive_length = win32.Length / sizeof (WCHAR); | |
4991 | } | |
260b8074 CV |
4992 | if (inaccessible_path) |
4993 | error = EACCES; | |
4994 | else if (win32.Length > (MAX_PATH - 2) * sizeof (WCHAR)) | |
4995 | error = ENAMETOOLONG; | |
4996 | else | |
4997 | error = 0; | |
4998 | } | |
1121c57f CV |
4999 | /* Keep the Win32 CWD in sync. Don't check for error, other than for |
5000 | strace output. Try to keep overhead low. */ | |
9c154abe | 5001 | override_win32_cwd (!nat_cwd, old_dismount_count); |
1870c688 | 5002 | |
260b8074 CV |
5003 | /* Eventually, create POSIX path if it's not set on entry. */ |
5004 | tmp_pathbuf tp; | |
5005 | if (!posix_cwd) | |
5006 | { | |
5007 | posix_cwd = (const char *) tp.c_get (); | |
5008 | mount_table->conv_to_posix_path (win32.Buffer, (char *) posix_cwd, 0); | |
1870c688 | 5009 | } |
260b8074 CV |
5010 | posix = (char *) crealloc_abort (posix, strlen (posix_cwd) + 1); |
5011 | stpcpy (posix, posix_cwd); | |
7e24f1bf | 5012 | |
1870c688 | 5013 | cwd_lock.release (); |
260b8074 CV |
5014 | return 0; |
5015 | } | |
5016 | ||
5017 | const char * | |
5018 | cwdstuff::get_error_desc () const | |
5019 | { | |
5020 | switch (cygheap->cwd.get_error ()) | |
5021 | { | |
5022 | case EACCES: | |
5023 | return "has restricted permissions which render it\n" | |
5024 | "inaccessible as Win32 working directory"; | |
5025 | case ENOTDIR: | |
5026 | return "is a virtual Cygwin directory which does\n" | |
5027 | "not exist for a native Windows application"; | |
5028 | case ENAMETOOLONG: | |
5029 | return "has a path longer than allowed for a\n" | |
5030 | "Win32 working directory"; | |
5031 | default: | |
5032 | break; | |
5033 | } | |
5034 | /* That shouldn't occur, unless we defined a new error code | |
5035 | in cwdstuff::set. */ | |
5036 | return "is not accessible for some unknown reason"; | |
1870c688 CV |
5037 | } |
5038 | ||
ee42ccd3 CV |
5039 | /* Store incoming wchar_t path as current posix cwd. This is called from |
5040 | setlocale so that the cwd is always stored in the right charset. */ | |
5041 | void | |
5042 | cwdstuff::reset_posix (wchar_t *w_cwd) | |
b6c6ea43 | 5043 | { |
ee42ccd3 CV |
5044 | size_t len = sys_wcstombs (NULL, (size_t) -1, w_cwd); |
5045 | posix = (char *) crealloc_abort (posix, len + 1); | |
5046 | sys_wcstombs (posix, len + 1, w_cwd); | |
b6c6ea43 CV |
5047 | } |
5048 | ||
1870c688 CV |
5049 | char * |
5050 | cwdstuff::get (char *buf, int need_posix, int with_chroot, unsigned ulen) | |
5051 | { | |
1870c688 | 5052 | tmp_pathbuf tp; |
c1f177d6 KB |
5053 | |
5054 | errno = 0; | |
1870c688 CV |
5055 | if (ulen) |
5056 | /* nothing */; | |
5057 | else if (buf == NULL) | |
5058 | ulen = (unsigned) -1; | |
5059 | else | |
5060 | { | |
5061 | set_errno (EINVAL); | |
5062 | goto out; | |
5063 | } | |
7e24f1bf | 5064 | |
1870c688 | 5065 | cwd_lock.acquire (); |
7e24f1bf | 5066 | |
1870c688 CV |
5067 | char *tocopy; |
5068 | if (!need_posix) | |
5069 | { | |
5070 | tocopy = tp.c_get (); | |
5071 | sys_wcstombs (tocopy, NT_MAX_PATH, win32.Buffer, | |
5072 | win32.Length / sizeof (WCHAR)); | |
5073 | } | |
5074 | else | |
5075 | tocopy = posix; | |
7905c4f1 | 5076 | |
1870c688 CV |
5077 | debug_printf ("posix %s", posix); |
5078 | if (strlen (tocopy) >= ulen) | |
5079 | { | |
5080 | set_errno (ERANGE); | |
5081 | buf = NULL; | |
5082 | } | |
5083 | else | |
5084 | { | |
5085 | if (!buf) | |
5086 | buf = (char *) malloc (strlen (tocopy) + 1); | |
5087 | strcpy (buf, tocopy); | |
5088 | if (!buf[0]) /* Should only happen when chroot */ | |
5089 | strcpy (buf, "/"); | |
5090 | } | |
7905c4f1 | 5091 | |
1870c688 CV |
5092 | cwd_lock.release (); |
5093 | ||
5094 | out: | |
61522196 | 5095 | syscall_printf ("(%s) = cwdstuff::get (%p, %u, %d, %d), errno %d", |
1870c688 | 5096 | buf, buf, ulen, need_posix, with_chroot, errno); |
1870c688 CV |
5097 | return buf; |
5098 | } | |
5099 | ||
1870c688 CV |
5100 | /* No need to be reentrant or thread-safe according to SUSv3. |
5101 | / and \\ are treated equally. Leading drive specifiers are | |
5102 | kept intact as far as it makes sense. Everything else is | |
5103 | POSIX compatible. */ | |
5104 | extern "C" char * | |
5105 | basename (char *path) | |
5106 | { | |
5107 | static char buf[4]; | |
5108 | char *c, *d, *bs = path; | |
5109 | ||
5110 | if (!path || !*path) | |
5111 | return strcpy (buf, "."); | |
5112 | if (isalpha (path[0]) && path[1] == ':') | |
5113 | bs += 2; | |
5114 | else if (strspn (path, "/\\") > 1) | |
5115 | ++bs; | |
5116 | c = strrchr (bs, '/'); | |
5117 | if ((d = strrchr (c ?: bs, '\\')) > c) | |
5118 | c = d; | |
5119 | if (c) | |
5120 | { | |
5121 | /* Trailing (back)slashes are eliminated. */ | |
5122 | while (c && c > bs && c[1] == '\0') | |
5123 | { | |
5124 | *c = '\0'; | |
5125 | c = strrchr (bs, '/'); | |
5126 | if ((d = strrchr (c ?: bs, '\\')) > c) | |
5127 | c = d; | |
5128 | } | |
5129 | if (c && (c > bs || c[1])) | |
5130 | return c + 1; | |
5131 | } | |
5132 | else if (!bs[0]) | |
5133 | { | |
5134 | stpncpy (buf, path, bs - path); | |
5135 | stpcpy (buf + (bs - path), "."); | |
5136 | return buf; | |
5137 | } | |
5138 | return path; | |
5139 | } | |
5140 | ||
75d5f68a YS |
5141 | /* The differences with the POSIX version above: |
5142 | - declared in <string.h> (instead of <libgen.h>); | |
5143 | - the argument is never modified, and therefore is marked const; | |
5144 | - the empty string is returned if path is an empty string, "/", or ends | |
5145 | with a trailing slash. */ | |
5146 | extern "C" char * | |
5147 | __gnu_basename (const char *path) | |
5148 | { | |
5149 | static char buf[1]; | |
5150 | char *c, *d, *bs = (char *)path; | |
5151 | ||
5152 | if (!path || !*path) | |
5153 | return strcpy (buf, ""); | |
5154 | if (isalpha (path[0]) && path[1] == ':') | |
5155 | bs += 2; | |
5156 | else if (strspn (path, "/\\") > 1) | |
5157 | ++bs; | |
5158 | c = strrchr (bs, '/'); | |
5159 | if ((d = strrchr (c ?: bs, '\\')) > c) | |
5160 | c = d; | |
5161 | if (c) | |
5162 | return c + 1; | |
5163 | else if (!bs[0]) | |
5164 | return strcpy (buf, ""); | |
5165 | return (char *)path; | |
5166 | } | |
5167 | ||
1870c688 CV |
5168 | /* No need to be reentrant or thread-safe according to SUSv3. |
5169 | / and \\ are treated equally. Leading drive specifiers and | |
5170 | leading double (back)slashes are kept intact as far as it | |
5171 | makes sense. Everything else is POSIX compatible. */ | |
5172 | extern "C" char * | |
5173 | dirname (char *path) | |
5174 | { | |
5175 | static char buf[4]; | |
5176 | char *c, *d, *bs = path; | |
5177 | ||
5178 | if (!path || !*path) | |
5179 | return strcpy (buf, "."); | |
5180 | if (isalpha (path[0]) && path[1] == ':') | |
5181 | bs += 2; | |
5182 | else if (strspn (path, "/\\") > 1) | |
5183 | ++bs; | |
5184 | c = strrchr (bs, '/'); | |
5185 | if ((d = strrchr (c ?: bs, '\\')) > c) | |
5186 | c = d; | |
5187 | if (c) | |
5188 | { | |
5189 | /* Trailing (back)slashes are eliminated. */ | |
5190 | while (c && c > bs && c[1] == '\0') | |
5191 | { | |
5192 | *c = '\0'; | |
5193 | c = strrchr (bs, '/'); | |
5194 | if ((d = strrchr (c ?: bs, '\\')) > c) | |
5195 | c = d; | |
5196 | } | |
5197 | if (!c) | |
5198 | strcpy (bs, "."); | |
5199 | else if (c > bs) | |
5200 | { | |
5201 | /* More trailing (back)slashes are eliminated. */ | |
5202 | while (c > bs && (*c == '/' || *c == '\\')) | |
5203 | *c-- = '\0'; | |
5204 | } | |
5205 | else | |
5206 | c[1] = '\0'; | |
5207 | } | |
5208 | else | |
5209 | { | |
5210 | stpncpy (buf, path, bs - path); | |
5211 | stpcpy (buf + (bs - path), "."); | |
5212 | return buf; | |
5213 | } | |
5214 | return path; | |
5215 | } |