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1 | /* | |
2 | * Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, | |
3 | * 2010, 2013 Red Hat, Inc. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * A copy of the GNU General Public License can be found at | |
11 | * http://www.gnu.org/ | |
12 | * | |
13 | * Written by DJ Delorie <dj@cygnus.com> | |
14 | * | |
15 | */ | |
16 | ||
17 | /* The purpose of this file is to hide all the details about accessing | |
18 | Cygwin's mount table. If the format or location of the mount table | |
19 | changes, this is the file to change to match it. */ | |
20 | ||
21 | #include "ini.h" | |
22 | #include "win32.h" | |
23 | #include "filemanip.h" | |
24 | #include "LogSingleton.h" | |
25 | ||
26 | #include <stdio.h> | |
27 | #include <stdlib.h> | |
28 | #include <malloc.h> | |
29 | ||
30 | // These headers aren't available outside the winsup tree | |
31 | // #include "../cygwin/include/cygwin/version.h" | |
32 | // KEEP SYNCHRONISED WITH /src/winsup/cygwin/include/cygwin/version.h | |
33 | ||
34 | #define CYGWIN_INFO_CYGWIN_REGISTRY_NAME "Cygwin" | |
35 | #define CYGWIN_INFO_CYGWIN_SETUP_REGISTRY_NAME "setup" | |
36 | ||
37 | // #include "../cygwin/include/sys/mount.h" | |
38 | ||
39 | // KEEP SYNCHRONISED WITH /src/winsup/cygwin/include/sys/mount.h | |
40 | #ifdef __cplusplus | |
41 | extern "C" { | |
42 | #endif | |
43 | ||
44 | enum | |
45 | { | |
46 | MOUNT_SYMLINK = 0x001, /* "mount point" is a symlink */ | |
47 | MOUNT_BINARY = 0x002, /* "binary" format read/writes */ | |
48 | MOUNT_SYSTEM = 0x008, /* mount point came from system table */ | |
49 | MOUNT_EXEC = 0x010, /* Any file in the mounted directory gets 'x' bit */ | |
50 | MOUNT_AUTO = 0x020, /* mount point refers to auto device mount */ | |
51 | MOUNT_CYGWIN_EXEC = 0x040, /* file or directory is or contains a cygwin executable */ | |
52 | MOUNT_MIXED = 0x080, /* reads are text, writes are binary */ | |
53 | }; | |
54 | ||
55 | // int mount (const char *, const char *, unsigned __flags); | |
56 | // int umount (const char *); | |
57 | // int cygwin_umount (const char *__path, unsigned __flags); | |
58 | ||
59 | #ifdef __cplusplus | |
60 | }; | |
61 | #endif | |
62 | ||
63 | ||
64 | ||
65 | #include "mount.h" | |
66 | #include "msg.h" | |
67 | #include "resource.h" | |
68 | #include "dialog.h" | |
69 | #include "state.h" | |
70 | ||
71 | #ifdef MAINTAINER_FEATURES | |
72 | #include "getopt++/GetOption.h" | |
73 | #include "getopt++/StringOption.h" | |
74 | static StringOption CygwinRegistryNameOption (CYGWIN_INFO_CYGWIN_REGISTRY_NAME, '#', "override-registry-name", "Override registry name to allow parallel installs for testing purposes", false); | |
75 | #undef CYGWIN_INFO_CYGWIN_REGISTRY_NAME | |
76 | #define CYGWIN_INFO_CYGWIN_REGISTRY_NAME (((std::string)CygwinRegistryNameOption).c_str()) | |
77 | #endif | |
78 | ||
79 | /* Used when treating / and \ as equivalent. */ | |
80 | #define SLASH_P(ch) \ | |
81 | ({ \ | |
82 | char __c = (ch); \ | |
83 | ((__c) == '/' || (__c) == '\\'); \ | |
84 | }) | |
85 | ||
86 | static struct mnt | |
87 | { | |
88 | std::string native; | |
89 | std::string posix; | |
90 | int istext; | |
91 | } | |
92 | mount_table[255]; | |
93 | ||
94 | struct mnt *root_here = NULL; | |
95 | ||
96 | void | |
97 | create_install_root () | |
98 | { | |
99 | char buf[1000]; | |
100 | HKEY key; | |
101 | DWORD disposition; | |
102 | DWORD rv; | |
103 | ||
104 | snprintf (buf, sizeof(buf), "Software\\%s\\%s", | |
105 | CYGWIN_INFO_CYGWIN_REGISTRY_NAME, | |
106 | CYGWIN_INFO_CYGWIN_SETUP_REGISTRY_NAME); | |
107 | HKEY kr = (root_scope == IDC_ROOT_USER) ? HKEY_CURRENT_USER | |
108 | : HKEY_LOCAL_MACHINE; | |
109 | do | |
110 | { | |
111 | rv = RegCreateKeyEx (kr, buf, 0, (char *)"Cygwin", 0, | |
112 | KEY_ALL_ACCESS | SETUP_KEY_WOW64, | |
113 | 0, &key, &disposition); | |
114 | if (rv != ERROR_ACCESS_DENIED || kr != HKEY_LOCAL_MACHINE) | |
115 | break; | |
116 | Log (LOG_PLAIN) << "Access denied trying to create rootdir registry key" | |
117 | << endLog; | |
118 | kr = HKEY_CURRENT_USER; | |
119 | } | |
120 | while (rv == ERROR_ACCESS_DENIED); | |
121 | if (rv == ERROR_SUCCESS) | |
122 | do | |
123 | { | |
124 | rv = RegSetValueEx (key, "rootdir", 0, REG_SZ, | |
125 | (BYTE *) get_root_dir ().c_str (), | |
126 | get_root_dir ().size () + 1); | |
127 | if (rv != ERROR_ACCESS_DENIED || kr != HKEY_LOCAL_MACHINE) | |
128 | break; | |
129 | Log (LOG_PLAIN) << "Access denied trying to create rootdir registry value" | |
130 | << endLog; | |
131 | kr = HKEY_CURRENT_USER; | |
132 | } | |
133 | while (rv == ERROR_ACCESS_DENIED); | |
134 | if (rv != ERROR_SUCCESS) | |
135 | mbox (NULL, IDS_MOUNT_REGISTRY_KEY_FAILED, MB_OK | MB_ICONWARNING); | |
136 | RegCloseKey (key); | |
137 | ||
138 | Log (LOG_TIMESTAMP) << "Registry value set: HKEY_" | |
139 | << (root_scope == IDC_ROOT_USER ? "CURRENT_USER\\" | |
140 | : "LOCAL_MACHINE\\") | |
141 | << buf << "\\rootdir = \"" << get_root_dir () << "\"" | |
142 | << endLog; | |
143 | } | |
144 | ||
145 | inline char * | |
146 | unconvert_slashes (char *in_name) | |
147 | { | |
148 | char *name = in_name; | |
149 | while ((name = strchr (name, '/')) != NULL) | |
150 | *name++ = '\\'; | |
151 | return in_name; | |
152 | } | |
153 | ||
154 | inline char * | |
155 | skip_ws (char *in) | |
156 | { | |
157 | while (*in == ' ' || *in == '\t') | |
158 | ++in; | |
159 | return in; | |
160 | } | |
161 | ||
162 | inline char * | |
163 | find_ws (char *in) | |
164 | { | |
165 | while (*in && *in != ' ' && *in != '\t') | |
166 | ++in; | |
167 | return in; | |
168 | } | |
169 | ||
170 | inline char * | |
171 | conv_fstab_spaces (char *field) | |
172 | { | |
173 | register char *sp = field; | |
174 | while ((sp = strstr (sp, "\\040"))) | |
175 | { | |
176 | *sp++ = ' '; | |
177 | memmove (sp, sp + 3, strlen (sp + 3) + 1); | |
178 | } | |
179 | return field; | |
180 | } | |
181 | ||
182 | static bool got_usr_bin; | |
183 | static bool got_usr_lib; | |
184 | ||
185 | static bool | |
186 | from_fstab_line (mnt *m, char *line) | |
187 | { | |
188 | char *native_path, *posix_path, *fs_type; | |
189 | ||
190 | /* First field: Native path. */ | |
191 | char *c = skip_ws (line); | |
192 | if (!*c || *c == '#') | |
193 | return false; | |
194 | char *cend = find_ws (c); | |
195 | *cend = '\0'; | |
196 | native_path = conv_fstab_spaces (c); | |
197 | /* Second field: POSIX path. */ | |
198 | c = skip_ws (cend + 1); | |
199 | if (!*c) | |
200 | return false; | |
201 | cend = find_ws (c); | |
202 | *cend = '\0'; | |
203 | posix_path = conv_fstab_spaces (c); | |
204 | /* Third field: FS type. */ | |
205 | c = skip_ws (cend + 1); | |
206 | if (!*c) | |
207 | return false; | |
208 | cend = find_ws (c); | |
209 | *cend = '\0'; | |
210 | fs_type = c; | |
211 | ||
212 | if (strcmp (fs_type, "cygdrive")) | |
213 | { | |
214 | for (mnt *sm = mount_table; sm < m; ++sm) | |
215 | if (sm->posix == std::string (posix_path)) | |
216 | { | |
217 | sm->native = std::string (unconvert_slashes (native_path)); | |
218 | return false; | |
219 | } | |
220 | m->posix = std::string (posix_path); | |
221 | m->native = std::string (unconvert_slashes (native_path)); | |
222 | if (!strcmp (posix_path, "/usr/bin")) | |
223 | got_usr_bin = true; | |
224 | else if (!strcmp (posix_path, "/usr/lib")) | |
225 | got_usr_lib = true; | |
226 | } | |
227 | return true; | |
228 | } | |
229 | ||
230 | #define BUFSIZE 65536 | |
231 | #define LFSTAB L"\\etc\\fstab" | |
232 | ||
233 | static bool | |
234 | from_fstab (mnt *m, const std::string& in_path) | |
235 | { | |
236 | char buf[BUFSIZE]; | |
237 | WCHAR path[in_path.size () + sizeof (LFSTAB)]; | |
238 | ||
239 | mklongpath (path, in_path.c_str (), sizeof (path) / sizeof (WCHAR)); | |
240 | wcscat (path, LFSTAB); | |
241 | HANDLE h = CreateFileW (path, GENERIC_READ, FILE_SHARE_READ, NULL, | |
242 | OPEN_EXISTING, | |
243 | FILE_ATTRIBUTE_NORMAL | FILE_FLAG_BACKUP_SEMANTICS, | |
244 | NULL); | |
245 | if (h == INVALID_HANDLE_VALUE) | |
246 | return false; | |
247 | char *got = buf; | |
248 | DWORD len = 0; | |
249 | /* Using BUFSIZE-2 leaves space to append two \0. */ | |
250 | while (ReadFile (h, got, BUFSIZE - 2 - (got - buf), &len, NULL)) | |
251 | { | |
252 | char *end; | |
253 | ||
254 | /* Set end marker. */ | |
255 | got[len] = got[len + 1] = '\0'; | |
256 | /* Set len to the absolute len of bytes in buf. */ | |
257 | len += got - buf; | |
258 | /* Reset got to start reading at the start of the buffer again. */ | |
259 | got = buf; | |
260 | while (got < buf + len && (end = strchr (got, '\n'))) | |
261 | { | |
262 | end[end[-1] == '\r' ? -1 : 0] = '\0'; | |
263 | if (from_fstab_line (m, got)) | |
264 | ++m; | |
265 | got = end + 1; | |
266 | } | |
267 | if (len < BUFSIZE - 1) | |
268 | break; | |
269 | /* We have to read once more. Move remaining bytes to the start of | |
270 | the buffer and reposition got so that it points to the end of | |
271 | the remaining bytes. */ | |
272 | len = buf + len - got; | |
273 | memmove (buf, got, len); | |
274 | got = buf + len; | |
275 | buf[len] = buf[len + 1] = '\0'; | |
276 | } | |
277 | if (got > buf && from_fstab_line (m, got)) | |
278 | ++m; | |
279 | CloseHandle (h); | |
280 | return true; | |
281 | } | |
282 | ||
283 | static void | |
284 | add_usr_mnts (struct mnt *m) | |
285 | { | |
286 | /* Set default /usr/bin and /usr/lib */ | |
287 | if (!got_usr_bin) | |
288 | { | |
289 | m->posix = "/usr/bin"; | |
290 | m->native = root_here->native + "\\bin"; | |
291 | ++m; | |
292 | } | |
293 | if (!got_usr_lib) | |
294 | { | |
295 | m->posix = "/usr/lib"; | |
296 | m->native = root_here->native + "\\lib"; | |
297 | } | |
298 | } | |
299 | ||
300 | void | |
301 | read_mounts (const std::string val) | |
302 | { | |
303 | DWORD posix_path_size; | |
304 | struct mnt *m = mount_table; | |
305 | char buf[10000]; | |
306 | ||
307 | root_here = NULL; | |
308 | for (mnt * m1 = mount_table; m1->posix.size (); m1++) | |
309 | { | |
310 | m1->posix.clear(); | |
311 | m1->native.clear(); | |
312 | } | |
313 | got_usr_bin = got_usr_lib = false; | |
314 | ||
315 | if (val.size ()) | |
316 | { | |
317 | /* Cygwin rootdir always < MAX_PATH. */ | |
318 | char rootdir[MAX_PATH + 1]; | |
319 | ||
320 | if (GetFullPathName (val.c_str (), MAX_PATH + 1, rootdir, NULL)) | |
321 | { | |
322 | m->native = rootdir; | |
323 | m->posix = "/"; | |
324 | root_here = m; | |
325 | add_usr_mnts (++m); | |
326 | } | |
327 | } | |
328 | else | |
329 | { | |
330 | /* Always check HKEY_LOCAL_MACHINE first. */ | |
331 | for (int isuser = 0; isuser <= 1; isuser++) | |
332 | { | |
333 | snprintf (buf, sizeof(buf), "Software\\%s\\%s", | |
334 | CYGWIN_INFO_CYGWIN_REGISTRY_NAME, | |
335 | CYGWIN_INFO_CYGWIN_SETUP_REGISTRY_NAME); | |
336 | HKEY key = isuser ? HKEY_CURRENT_USER : HKEY_LOCAL_MACHINE; | |
337 | if (RegOpenKeyEx (key, buf, 0, KEY_ALL_ACCESS | SETUP_KEY_WOW64, | |
338 | &key) != ERROR_SUCCESS) | |
339 | continue; | |
340 | DWORD type; | |
341 | /* Cygwin rootdir always < MAX_PATH. */ | |
342 | char aBuffer[MAX_PATH + 1]; | |
343 | posix_path_size = MAX_PATH; | |
344 | if (RegQueryValueEx | |
345 | (key, "rootdir", 0, &type, (BYTE *) aBuffer, | |
346 | &posix_path_size) == ERROR_SUCCESS) | |
347 | { | |
348 | m->native = std::string (aBuffer); | |
349 | m->posix = "/"; | |
350 | root_here = m++; | |
351 | from_fstab (m, root_here->native); | |
352 | add_usr_mnts (m); | |
353 | break; | |
354 | } | |
355 | RegCloseKey (key); | |
356 | } | |
357 | } | |
358 | ||
359 | if (!root_here) | |
360 | { | |
361 | /* Affected path always < MAX_PATH. */ | |
362 | char windir[MAX_PATH]; | |
363 | GetSystemWindowsDirectory (windir, sizeof (windir)); | |
364 | windir[2] = 0; | |
365 | m->native = std::string (windir) + (is_64bit ? "\\cygwin64" : "\\cygwin"); | |
366 | m->posix = "/"; | |
367 | root_here = m; | |
368 | add_usr_mnts (++m); | |
369 | } | |
370 | } | |
371 | ||
372 | // set default root_scope: USER if only HKEY_CURRENT_USER registry key exists, | |
373 | // otherwise SYSTEM. | |
374 | void set_default_root_scope() | |
375 | { | |
376 | root_scope = IDC_ROOT_SYSTEM; | |
377 | ||
378 | char buf[10000]; | |
379 | for (int isuser = 0; isuser <= 1; isuser++) | |
380 | { | |
381 | snprintf (buf, sizeof(buf), "Software\\%s\\%s", | |
382 | CYGWIN_INFO_CYGWIN_REGISTRY_NAME, | |
383 | CYGWIN_INFO_CYGWIN_SETUP_REGISTRY_NAME); | |
384 | HKEY key = isuser ? HKEY_CURRENT_USER : HKEY_LOCAL_MACHINE; | |
385 | if (RegOpenKeyEx (key, buf, 0, KEY_ALL_ACCESS | SETUP_KEY_WOW64, | |
386 | &key) == ERROR_SUCCESS) | |
387 | { | |
388 | RegCloseKey (key); | |
389 | root_scope = isuser ? IDC_ROOT_USER : IDC_ROOT_SYSTEM; | |
390 | break; | |
391 | } | |
392 | } | |
393 | } | |
394 | ||
395 | void | |
396 | set_root_dir (const std::string val) | |
397 | { | |
398 | read_mounts (val); | |
399 | } | |
400 | ||
401 | static std::string empty; | |
402 | ||
403 | const std::string & | |
404 | get_root_dir () | |
405 | { | |
406 | return root_here ? root_here->native : empty; | |
407 | } | |
408 | ||
409 | /* Return non-zero if PATH1 is a prefix of PATH2. | |
410 | Both are assumed to be of the same path style and / vs \ usage. | |
411 | Neither may be "". | |
412 | ||
413 | Examples: | |
414 | /foo/ is a prefix of /foo <-- may seem odd, but desired | |
415 | /foo is a prefix of /foo/ | |
416 | / is a prefix of /foo/bar | |
417 | / is not a prefix of foo/bar | |
418 | foo/ is a prefix foo/bar | |
419 | /foo is not a prefix of /foobar | |
420 | */ | |
421 | ||
422 | static int | |
423 | path_prefix_p (const std::string path1, const std::string path2) | |
424 | { | |
425 | size_t len1 = path1.size (); | |
426 | /* Handle case where PATH1 has trailing '/' and when it doesn't. */ | |
427 | if (len1 > 0 && SLASH_P (path1.c_str ()[len1 - 1])) | |
428 | --len1; | |
429 | ||
430 | if (len1 == 0) | |
431 | return SLASH_P (path2.c_str ()[0]) | |
432 | && !SLASH_P (path2.c_str ()[1]); | |
433 | ||
434 | if (casecompare(path1, path2, len1) != 0) | |
435 | return 0; | |
436 | ||
437 | return SLASH_P (path2.c_str ()[len1]) || path2.size () == len1 | |
438 | || path1.c_str ()[len1 - 1] == ':'; | |
439 | } | |
440 | ||
441 | std::string | |
442 | cygpath (const std::string& thePath) | |
443 | { | |
444 | size_t max_len = 0; | |
445 | struct mnt *m, *match = NULL; | |
446 | for (m = mount_table; m->posix.size (); m++) | |
447 | { | |
448 | size_t n = m->posix.size (); | |
449 | if (n <= max_len || !path_prefix_p (m->posix, thePath)) | |
450 | continue; | |
451 | max_len = n; | |
452 | match = m; | |
453 | } | |
454 | ||
455 | if (!match) | |
456 | return std::string(); | |
457 | ||
458 | std::string native; | |
459 | if (max_len == thePath.size ()) | |
460 | { | |
461 | native = match->native; | |
462 | } | |
463 | else if (match->posix.size () > 1) | |
464 | native = match->native + thePath.substr(max_len, std::string::npos); | |
465 | else | |
466 | native = match->native + "/" + thePath.substr(max_len, std::string::npos); | |
467 | return native; | |
468 | } |