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Commit | Line | Data |
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69b7e41e KZ |
1 | /* |
2 | * Copyright (C) 2008-2009 Karel Zak <kzak@redhat.com> | |
3 | * | |
4 | * This file may be redistributed under the terms of the | |
5 | * GNU Lesser General Public License. | |
6 | */ | |
7 | ||
192c6aad KZ |
8 | /** |
9 | * SECTION: utils | |
10 | * @title: Utils | |
11 | * @short_description: misc utils. | |
12 | */ | |
69b7e41e | 13 | #include <ctype.h> |
69b7e41e KZ |
14 | #include <fcntl.h> |
15 | #include <pwd.h> | |
a1e8af75 | 16 | #include <grp.h> |
69b7e41e | 17 | |
b49103ed | 18 | #include "strutils.h" |
0532ba1d | 19 | #include "pathnames.h" |
69b7e41e | 20 | #include "mountP.h" |
3c5e4ef8 | 21 | #include "mangle.h" |
0bb44be3 | 22 | #include "canonicalize.h" |
035507c8 | 23 | #include "env.h" |
b483debb | 24 | #include "match.h" |
69b7e41e | 25 | |
b49103ed KZ |
26 | int endswith(const char *s, const char *sx) |
27 | { | |
28 | ssize_t off; | |
29 | ||
30 | assert(s); | |
31 | assert(sx); | |
32 | ||
33 | off = strlen(s); | |
34 | if (!off) | |
35 | return 0; | |
36 | off -= strlen(sx); | |
37 | if (off < 0) | |
38 | return 0; | |
39 | ||
40 | return !strcmp(s + off, sx); | |
41 | } | |
42 | ||
43 | int startswith(const char *s, const char *sx) | |
44 | { | |
45 | size_t off; | |
46 | ||
47 | assert(s); | |
48 | assert(sx); | |
49 | ||
50 | off = strlen(sx); | |
51 | if (!off) | |
52 | return 0; | |
53 | ||
54 | return !strncmp(s, sx, off); | |
55 | } | |
56 | ||
fd1eb7a7 KZ |
57 | int mnt_parse_offset(const char *str, size_t len, uintmax_t *res) |
58 | { | |
59 | char *p; | |
60 | int rc = 0; | |
61 | ||
62 | if (!str && !*str) | |
63 | return -EINVAL; | |
64 | ||
65 | p = strndup(str, len); | |
66 | if (!p) | |
67 | return -errno; | |
68 | ||
69 | if (strtosize(p, res)) | |
70 | rc = -EINVAL; | |
71 | free(p); | |
72 | return rc; | |
73 | } | |
74 | ||
1d0cd73f KZ |
75 | /* returns basename and keeps dirname in the @path, if @path is "/" (root) |
76 | * then returns empty string */ | |
77 | static char *stripoff_last_component(char *path) | |
78 | { | |
79 | char *p = path ? strrchr(path, '/') : NULL; | |
80 | ||
81 | if (!p) | |
82 | return NULL; | |
83 | *p = '\0'; | |
61073773 | 84 | return p + 1; |
1d0cd73f KZ |
85 | } |
86 | ||
61073773 KZ |
87 | /* |
88 | * Note that the @target has to be absolute path (so at least "/"). The | |
89 | * @filename returns allocated buffer with last path component, for example: | |
90 | * | |
91 | * mnt_chdir_to_parent("/mnt/test", &buf) ==> chdir("/mnt"), buf="test" | |
66bb8267 KZ |
92 | */ |
93 | int mnt_chdir_to_parent(const char *target, char **filename) | |
94 | { | |
61073773 | 95 | char *buf, *parent, *last = NULL; |
66bb8267 KZ |
96 | char cwd[PATH_MAX]; |
97 | int rc = -EINVAL; | |
98 | ||
99 | if (!target || *target != '/') | |
100 | return -EINVAL; | |
101 | ||
61073773 KZ |
102 | DBG(UTILS, mnt_debug("moving to %s parent", target)); |
103 | ||
104 | buf = strdup(target); | |
105 | if (!buf) | |
66bb8267 KZ |
106 | return -ENOMEM; |
107 | ||
61073773 KZ |
108 | if (*(buf + 1) != '\0') { |
109 | last = stripoff_last_component(buf); | |
66bb8267 KZ |
110 | if (!last) |
111 | goto err; | |
112 | } | |
66bb8267 | 113 | |
61073773 KZ |
114 | parent = buf && *buf ? buf : "/"; |
115 | ||
116 | if (chdir(parent) == -1) { | |
117 | DBG(UTILS, mnt_debug("failed to chdir to %s: %m", parent)); | |
66bb8267 KZ |
118 | rc = -errno; |
119 | goto err; | |
120 | } | |
121 | if (!getcwd(cwd, sizeof(cwd))) { | |
122 | DBG(UTILS, mnt_debug("failed to obtain current directory: %m")); | |
123 | rc = -errno; | |
124 | goto err; | |
125 | } | |
61073773 KZ |
126 | if (strcmp(cwd, parent) != 0) { |
127 | DBG(UTILS, mnt_debug( | |
128 | "unexpected chdir (expected=%s, cwd=%s)", parent, cwd)); | |
66bb8267 KZ |
129 | goto err; |
130 | } | |
131 | ||
61073773 KZ |
132 | DBG(CXT, mnt_debug( |
133 | "current directory moved to %s [last_component='%s']", | |
134 | parent, last)); | |
66bb8267 | 135 | |
61073773 | 136 | *filename = buf; |
66bb8267 KZ |
137 | |
138 | if (!last || !*last) | |
139 | memcpy(*filename, ".", 2); | |
140 | else | |
141 | memcpy(*filename, last, strlen(last) + 1); | |
142 | return 0; | |
143 | err: | |
61073773 | 144 | free(buf); |
66bb8267 KZ |
145 | return rc; |
146 | } | |
147 | ||
3c5e4ef8 KZ |
148 | /** |
149 | * mnt_mangle: | |
150 | * @str: string | |
151 | * | |
152 | * Encode @str to be compatible with fstab/mtab | |
153 | * | |
154 | * Returns: new allocated string or NULL in case of error. | |
155 | */ | |
156 | char *mnt_mangle(const char *str) | |
157 | { | |
158 | return mangle(str); | |
159 | } | |
160 | ||
161 | /** | |
162 | * mnt_unmangle: | |
163 | * @str: string | |
164 | * | |
165 | * Decode @str from fstab/mtab | |
166 | * | |
167 | * Returns: new allocated string or NULL in case of error. | |
168 | */ | |
169 | char *mnt_unmangle(const char *str) | |
170 | { | |
dd369652 | 171 | return unmangle(str, NULL); |
3c5e4ef8 KZ |
172 | } |
173 | ||
69b7e41e KZ |
174 | /** |
175 | * mnt_fstype_is_pseudofs: | |
176 | * @type: filesystem name | |
177 | * | |
178 | * Returns: 1 for filesystems like proc, sysfs, ... or 0. | |
179 | */ | |
180 | int mnt_fstype_is_pseudofs(const char *type) | |
181 | { | |
182 | if (!type) | |
183 | return 0; | |
184 | if (strcmp(type, "none") == 0 || | |
185 | strcmp(type, "proc") == 0 || | |
186 | strcmp(type, "tmpfs") == 0 || | |
187 | strcmp(type, "sysfs") == 0 || | |
854fa6d9 | 188 | strcmp(type, "autofs") == 0 || |
69b7e41e | 189 | strcmp(type, "devpts") == 0|| |
f5017242 | 190 | strcmp(type, "cgroup") == 0 || |
854fa6d9 | 191 | strcmp(type, "devtmpfs") == 0 || |
69b7e41e KZ |
192 | strcmp(type, "devfs") == 0 || |
193 | strcmp(type, "dlmfs") == 0 || | |
194 | strcmp(type, "cpuset") == 0 || | |
1bbe1bc7 | 195 | strcmp(type, "securityfs") == 0 || |
854fa6d9 | 196 | strcmp(type, "hugetlbfs") == 0 || |
c5a6f7a9 KZ |
197 | strcmp(type, "rpc_pipefs") == 0 || |
198 | strcmp(type, "fusectl") == 0 || | |
854fa6d9 | 199 | strcmp(type, "mqueue") == 0 || |
c5a6f7a9 KZ |
200 | strcmp(type, "binfmt_misc") == 0 || |
201 | strcmp(type, "fuse.gvfs-fuse-daemon") == 0 || | |
1bbe1bc7 | 202 | strcmp(type, "debugfs") == 0 || |
69b7e41e KZ |
203 | strcmp(type, "spufs") == 0) |
204 | return 1; | |
205 | return 0; | |
206 | } | |
207 | ||
208 | /** | |
209 | * mnt_fstype_is_netfs: | |
210 | * @type: filesystem name | |
211 | * | |
212 | * Returns: 1 for filesystems like cifs, nfs, ... or 0. | |
213 | */ | |
214 | int mnt_fstype_is_netfs(const char *type) | |
215 | { | |
216 | if (!type) | |
217 | return 0; | |
c59cf20c | 218 | if (strcmp(type, "cifs") == 0 || |
69b7e41e | 219 | strcmp(type, "smbfs") == 0 || |
c59cf20c KZ |
220 | strncmp(type,"nfs", 3) == 0 || |
221 | strcmp(type, "afs") == 0 || | |
222 | strcmp(type, "ncpfs") == 0 || | |
223 | strncmp(type,"9p", 2) == 0) | |
69b7e41e KZ |
224 | return 1; |
225 | return 0; | |
226 | } | |
227 | ||
abc9c0f7 KZ |
228 | /** |
229 | * mnt_match_fstype: | |
230 | * @type: filesystem type | |
6ad929bb | 231 | * @pattern: filesystem name or comma delimited list of names |
abc9c0f7 KZ |
232 | * |
233 | * The @pattern list of filesystem can be prefixed with a global | |
234 | * "no" prefix to invert matching of the whole list. The "no" could | |
6ad929bb | 235 | * also be used for individual items in the @pattern list. So, |
3d735589 | 236 | * "nofoo,bar" has the same meaning as "nofoo,nobar". |
abc9c0f7 | 237 | * |
3d735589 KZ |
238 | * "bar" : "nofoo,bar" -> False (global "no" prefix) |
239 | * | |
240 | * "bar" : "foo,bar" -> True | |
abc9c0f7 | 241 | * |
abc9c0f7 KZ |
242 | * "bar" : "foo,nobar" -> False |
243 | * | |
244 | * Returns: 1 if type is matching, else 0. This function also returns | |
245 | * 0 if @pattern is NULL and @type is non-NULL. | |
246 | */ | |
247 | int mnt_match_fstype(const char *type, const char *pattern) | |
248 | { | |
12089155 | 249 | return match_fstype(type, pattern); |
abc9c0f7 KZ |
250 | } |
251 | ||
252 | ||
253 | /* Returns 1 if needle found or noneedle not found in haystack | |
254 | * Otherwise returns 0 | |
255 | */ | |
256 | static int check_option(const char *haystack, size_t len, | |
257 | const char *needle, size_t needle_len) | |
258 | { | |
259 | const char *p; | |
260 | int no = 0; | |
261 | ||
ede8a60e KZ |
262 | if (needle_len >= 1 && *needle == '+') { |
263 | needle++; | |
264 | needle_len--; | |
265 | } else if (needle_len >= 2 && !strncmp(needle, "no", 2)) { | |
abc9c0f7 KZ |
266 | no = 1; |
267 | needle += 2; | |
268 | needle_len -= 2; | |
269 | } | |
270 | ||
271 | for (p = haystack; p && p < haystack + len; p++) { | |
272 | char *sep = strchr(p, ','); | |
7fc6d2b8 KZ |
273 | size_t plen = sep ? (size_t) (sep - p) : |
274 | len - (p - haystack); | |
abc9c0f7 KZ |
275 | |
276 | if (plen == needle_len) { | |
277 | if (!strncmp(p, needle, plen)) | |
278 | return !no; /* foo or nofoo was found */ | |
279 | } | |
280 | p += plen; | |
281 | } | |
282 | ||
283 | return no; /* foo or nofoo was not found */ | |
284 | } | |
285 | ||
286 | /** | |
287 | * mnt_match_options: | |
288 | * @optstr: options string | |
6ad929bb | 289 | * @pattern: comma delimited list of options |
abc9c0f7 KZ |
290 | * |
291 | * The "no" could used for individual items in the @options list. The "no" | |
6ad929bb | 292 | * prefix does not have a global meaning. |
abc9c0f7 KZ |
293 | * |
294 | * Unlike fs type matching, nonetdev,user and nonetdev,nouser have | |
295 | * DIFFERENT meanings; each option is matched explicitly as specified. | |
296 | * | |
ede8a60e KZ |
297 | * The "no" prefix interpretation could be disable by "+" prefix, for example |
298 | * "+noauto" matches if @optstr literally contains "noauto" string. | |
299 | * | |
3d735589 KZ |
300 | * "xxx,yyy,zzz" : "nozzz" -> False |
301 | * | |
302 | * "xxx,yyy,zzz" : "xxx,noeee" -> True | |
abc9c0f7 | 303 | * |
ede8a60e KZ |
304 | * "bar,zzz" : "nofoo" -> True |
305 | * | |
306 | * "nofoo,bar" : "+nofoo" -> True | |
307 | * | |
308 | * "bar,zzz" : "+nofoo" -> False | |
309 | * | |
310 | * | |
abc9c0f7 KZ |
311 | * Returns: 1 if pattern is matching, else 0. This function also returns 0 |
312 | * if @pattern is NULL and @optstr is non-NULL. | |
313 | */ | |
314 | int mnt_match_options(const char *optstr, const char *pattern) | |
315 | { | |
316 | const char *p; | |
317 | size_t len, optstr_len = 0; | |
318 | ||
319 | if (!pattern && !optstr) | |
320 | return 1; | |
321 | if (!pattern) | |
322 | return 0; | |
323 | ||
324 | len = strlen(pattern); | |
325 | if (optstr) | |
326 | optstr_len = strlen(optstr); | |
327 | ||
328 | for (p = pattern; p < pattern + len; p++) { | |
329 | char *sep = strchr(p, ','); | |
7fc6d2b8 KZ |
330 | size_t plen = sep ? (size_t) (sep - p) : |
331 | len - (p - pattern); | |
abc9c0f7 KZ |
332 | |
333 | if (!plen) | |
334 | continue; /* if two ',' appear in a row */ | |
335 | ||
336 | if (!check_option(optstr, optstr_len, p, plen)) | |
337 | return 0; /* any match failure means failure */ | |
338 | ||
339 | p += plen; | |
340 | } | |
341 | ||
342 | /* no match failures in list means success */ | |
343 | return 1; | |
344 | } | |
345 | ||
97e23b5e KZ |
346 | void mnt_free_filesystems(char **filesystems) |
347 | { | |
348 | char **p; | |
349 | ||
350 | if (!filesystems) | |
351 | return; | |
352 | for (p = filesystems; *p; p++) | |
353 | free(*p); | |
354 | free(filesystems); | |
355 | } | |
356 | ||
357 | static int add_filesystem(char ***filesystems, char *name) | |
358 | { | |
359 | int n = 0; | |
360 | ||
361 | assert(filesystems); | |
362 | assert(name); | |
363 | ||
364 | if (*filesystems) { | |
365 | char **p; | |
366 | for (n = 0, p = *filesystems; *p; p++, n++) { | |
367 | if (strcmp(*p, name) == 0) | |
368 | return 0; | |
369 | } | |
370 | } | |
371 | ||
372 | #define MYCHUNK 16 | |
373 | ||
374 | if (n == 0 || !((n + 1) % MYCHUNK)) { | |
375 | size_t items = ((n + 1 + MYCHUNK) / MYCHUNK) * MYCHUNK; | |
376 | char **x = realloc(*filesystems, items * sizeof(char *)); | |
377 | ||
378 | if (!x) | |
379 | goto err; | |
380 | *filesystems = x; | |
381 | } | |
382 | name = strdup(name); | |
383 | if (!name) | |
384 | goto err; | |
385 | (*filesystems)[n] = name; | |
386 | (*filesystems)[n + 1] = NULL; | |
387 | return 0; | |
388 | err: | |
389 | mnt_free_filesystems(*filesystems); | |
390 | return -ENOMEM; | |
391 | } | |
392 | ||
393 | static int get_filesystems(const char *filename, char ***filesystems, const char *pattern) | |
394 | { | |
395 | FILE *f; | |
396 | char line[128]; | |
397 | ||
398 | f = fopen(filename, "r"); | |
399 | if (!f) | |
400 | return 0; | |
401 | ||
402 | while (fgets(line, sizeof(line), f)) { | |
403 | char name[sizeof(line)]; | |
404 | int rc; | |
405 | ||
406 | if (*line == '#' || strncmp(line, "nodev", 5) == 0) | |
407 | continue; | |
408 | if (sscanf(line, " %128[^\n ]\n", name) != 1) | |
409 | continue; | |
410 | if (pattern && !mnt_match_fstype(name, pattern)) | |
411 | continue; | |
412 | rc = add_filesystem(filesystems, name); | |
413 | if (rc) | |
414 | return rc; | |
415 | } | |
416 | return 0; | |
417 | } | |
418 | ||
419 | int mnt_get_filesystems(char ***filesystems, const char *pattern) | |
420 | { | |
421 | int rc; | |
422 | ||
423 | if (!filesystems) | |
424 | return -EINVAL; | |
425 | *filesystems = NULL; | |
426 | ||
427 | rc = get_filesystems(_PATH_FILESYSTEMS, filesystems, pattern); | |
428 | if (rc) | |
429 | return rc; | |
430 | return get_filesystems(_PATH_PROC_FILESYSTEMS, filesystems, pattern); | |
431 | } | |
432 | ||
69b7e41e KZ |
433 | /* |
434 | * Returns allocated string with username or NULL. | |
435 | */ | |
436 | char *mnt_get_username(const uid_t uid) | |
437 | { | |
438 | struct passwd pwd; | |
439 | struct passwd *res; | |
282a58fd | 440 | #ifdef _SC_GETPW_R_SIZE_MAX |
69b7e41e | 441 | size_t sz = sysconf(_SC_GETPW_R_SIZE_MAX); |
282a58fd KZ |
442 | #else |
443 | size_t sz = 0; | |
444 | #endif | |
69b7e41e KZ |
445 | char *buf, *username = NULL; |
446 | ||
447 | if (sz <= 0) | |
448 | sz = 16384; /* Should be more than enough */ | |
449 | ||
450 | buf = malloc(sz); | |
451 | if (!buf) | |
452 | return NULL; | |
453 | ||
454 | if (!getpwuid_r(uid, &pwd, buf, sz, &res) && res) | |
455 | username = strdup(pwd.pw_name); | |
456 | ||
457 | free(buf); | |
458 | return username; | |
459 | } | |
abc9c0f7 | 460 | |
a1e8af75 KZ |
461 | int mnt_get_uid(const char *username, uid_t *uid) |
462 | { | |
188dc15a | 463 | int rc = -1; |
a1e8af75 KZ |
464 | struct passwd pwd; |
465 | struct passwd *pw; | |
466 | size_t sz = sysconf(_SC_GETPW_R_SIZE_MAX); | |
467 | char *buf; | |
468 | ||
188dc15a KZ |
469 | if (!username || !uid) |
470 | return -EINVAL; | |
a1e8af75 KZ |
471 | if (sz <= 0) |
472 | sz = 16384; /* Should be more than enough */ | |
473 | ||
474 | buf = malloc(sz); | |
475 | if (!buf) | |
476 | return -ENOMEM; | |
477 | ||
188dc15a | 478 | if (!getpwnam_r(username, &pwd, buf, sz, &pw) && pw) { |
a1e8af75 | 479 | *uid= pw->pw_uid; |
188dc15a KZ |
480 | rc = 0; |
481 | } else { | |
482 | DBG(UTILS, mnt_debug( | |
483 | "cannot convert '%s' username to UID", username)); | |
484 | } | |
a1e8af75 KZ |
485 | |
486 | free(buf); | |
188dc15a | 487 | return rc; |
a1e8af75 KZ |
488 | } |
489 | ||
490 | int mnt_get_gid(const char *groupname, gid_t *gid) | |
491 | { | |
188dc15a | 492 | int rc = -1; |
a1e8af75 KZ |
493 | struct group grp; |
494 | struct group *gr; | |
495 | size_t sz = sysconf(_SC_GETGR_R_SIZE_MAX); | |
496 | char *buf; | |
497 | ||
188dc15a KZ |
498 | if (!groupname || !gid) |
499 | return -EINVAL; | |
a1e8af75 KZ |
500 | if (sz <= 0) |
501 | sz = 16384; /* Should be more than enough */ | |
502 | ||
503 | buf = malloc(sz); | |
504 | if (!buf) | |
505 | return -ENOMEM; | |
506 | ||
188dc15a | 507 | if (!getgrnam_r(groupname, &grp, buf, sz, &gr) && gr) { |
a1e8af75 | 508 | *gid= gr->gr_gid; |
188dc15a KZ |
509 | rc = 0; |
510 | } else { | |
511 | DBG(UTILS, mnt_debug( | |
512 | "cannot convert '%s' groupname to GID", groupname)); | |
513 | } | |
a1e8af75 KZ |
514 | |
515 | free(buf); | |
188dc15a KZ |
516 | return rc; |
517 | } | |
518 | ||
519 | int mnt_in_group(gid_t gid) | |
520 | { | |
521 | int rc = 0, n, i; | |
522 | gid_t *grps = NULL; | |
523 | ||
524 | if (getgid() == gid) | |
525 | return 1; | |
526 | ||
527 | n = getgroups(0, NULL); | |
528 | if (n <= 0) | |
529 | goto done; | |
530 | ||
531 | grps = malloc(n * sizeof(*grps)); | |
532 | if (!grps) | |
533 | goto done; | |
534 | ||
535 | if (getgroups(n, grps) == n) { | |
536 | for (i = 0; i < n; i++) { | |
537 | if (grps[i] == gid) { | |
538 | rc = 1; | |
539 | break; | |
540 | } | |
541 | } | |
542 | } | |
543 | done: | |
544 | free(grps); | |
545 | return rc; | |
a1e8af75 KZ |
546 | } |
547 | ||
1d0cd73f KZ |
548 | static int try_write(const char *filename) |
549 | { | |
550 | int fd; | |
551 | ||
552 | if (!filename) | |
553 | return -EINVAL; | |
554 | ||
b0bb8fb6 KZ |
555 | fd = open(filename, O_RDWR|O_CREAT, S_IWUSR| \ |
556 | S_IRUSR|S_IRGRP|S_IROTH); | |
1d0cd73f KZ |
557 | if (fd >= 0) { |
558 | close(fd); | |
559 | return 0; | |
560 | } | |
561 | return -errno; | |
562 | } | |
563 | ||
564 | /** | |
565 | * mnt_has_regular_mtab: | |
566 | * @mtab: returns path to mtab | |
567 | * @writable: returns 1 if the file is writable | |
568 | * | |
569 | * If the file does not exist and @writable argument is not NULL then it will | |
570 | * try to create the file | |
571 | * | |
6ad929bb | 572 | * Returns: 1 if /etc/mtab is a regular file, and 0 in case of error (check |
1d0cd73f | 573 | * errno for more details). |
0532ba1d | 574 | */ |
1d0cd73f | 575 | int mnt_has_regular_mtab(const char **mtab, int *writable) |
0532ba1d KZ |
576 | { |
577 | struct stat st; | |
70bf97ae | 578 | int rc; |
1d0cd73f | 579 | const char *filename = mtab && *mtab ? *mtab : mnt_get_mtab_path(); |
0532ba1d | 580 | |
7c118af7 KZ |
581 | if (writable) |
582 | *writable = 0; | |
70bf97ae | 583 | if (mtab && !*mtab) |
1d0cd73f KZ |
584 | *mtab = filename; |
585 | ||
586 | DBG(UTILS, mnt_debug("mtab: %s", filename)); | |
70bf97ae | 587 | |
1d0cd73f KZ |
588 | rc = lstat(filename, &st); |
589 | ||
590 | if (rc == 0) { | |
591 | /* file exist */ | |
592 | if (S_ISREG(st.st_mode)) { | |
593 | if (writable) | |
594 | *writable = !try_write(filename); | |
595 | return 1; | |
596 | } | |
7c118af7 | 597 | goto done; |
1d0cd73f KZ |
598 | } |
599 | ||
600 | /* try to create the file */ | |
70bf97ae | 601 | if (writable) { |
1d0cd73f | 602 | *writable = !try_write(filename); |
7c118af7 KZ |
603 | if (*writable) |
604 | return 1; | |
1d0cd73f KZ |
605 | } |
606 | ||
7c118af7 KZ |
607 | done: |
608 | DBG(UTILS, mnt_debug("%s: irregular/non-writable", filename)); | |
1d0cd73f KZ |
609 | return 0; |
610 | } | |
7c118af7 | 611 | |
77417bc0 KZ |
612 | /* |
613 | * Don't export this to libmount API -- utab is private library stuff. | |
1d0cd73f KZ |
614 | * |
615 | * If the file does not exist and @writable argument is not NULL then it will | |
a362ae60 | 616 | * try to create the directory (e.g. /run/mount) and the file. |
1d0cd73f | 617 | * |
a362ae60 | 618 | * Returns: 1 if utab is a regular file, and 0 in case of |
6f5788c5 | 619 | * error (check errno for more details). |
1d0cd73f | 620 | */ |
1d0cd73f KZ |
621 | int mnt_has_regular_utab(const char **utab, int *writable) |
622 | { | |
623 | struct stat st; | |
624 | int rc; | |
625 | const char *filename = utab && *utab ? *utab : mnt_get_utab_path(); | |
626 | ||
7c118af7 KZ |
627 | if (writable) |
628 | *writable = 0; | |
1d0cd73f KZ |
629 | if (utab && !*utab) |
630 | *utab = filename; | |
631 | ||
632 | DBG(UTILS, mnt_debug("utab: %s", filename)); | |
633 | ||
634 | rc = lstat(filename, &st); | |
635 | ||
636 | if (rc == 0) { | |
637 | /* file exist */ | |
638 | if (S_ISREG(st.st_mode)) { | |
639 | if (writable) | |
7c118af7 | 640 | *writable = !try_write(filename); |
1d0cd73f | 641 | return 1; |
70bf97ae | 642 | } |
7c118af7 | 643 | goto done; /* it's not regular file */ |
70bf97ae | 644 | } |
1d0cd73f KZ |
645 | |
646 | if (writable) { | |
647 | char *dirname = strdup(filename); | |
648 | ||
649 | if (!dirname) | |
7c118af7 | 650 | goto done; |
1d0cd73f KZ |
651 | |
652 | stripoff_last_component(dirname); /* remove filename */ | |
653 | ||
b0bb8fb6 KZ |
654 | rc = mkdir(dirname, S_IWUSR| |
655 | S_IRUSR|S_IRGRP|S_IROTH| | |
656 | S_IXUSR|S_IXGRP|S_IXOTH); | |
1d0cd73f KZ |
657 | free(dirname); |
658 | if (rc && errno != EEXIST) | |
7c118af7 | 659 | goto done; /* probably EACCES */ |
1d0cd73f KZ |
660 | |
661 | *writable = !try_write(filename); | |
7c118af7 KZ |
662 | if (*writable) |
663 | return 1; | |
1d0cd73f | 664 | } |
7c118af7 KZ |
665 | done: |
666 | DBG(UTILS, mnt_debug("%s: irregular/non-writable file", filename)); | |
1d0cd73f | 667 | return 0; |
0532ba1d KZ |
668 | } |
669 | ||
3a5b1b1d KZ |
670 | /** |
671 | * mnt_get_fstab_path: | |
672 | * | |
673 | * Returns: path to /etc/fstab or $LIBMOUNT_FSTAB. | |
674 | */ | |
675 | const char *mnt_get_fstab_path(void) | |
676 | { | |
035507c8 | 677 | const char *p = safe_getenv("LIBMOUNT_FSTAB"); |
3a5b1b1d KZ |
678 | return p ? : _PATH_MNTTAB; |
679 | } | |
680 | ||
681 | /** | |
682 | * mnt_get_mtab_path: | |
683 | * | |
b37dd175 | 684 | * This function returns *default* location of the mtab file. The result does |
0f32f1e2 | 685 | * not have to be writable. See also mnt_has_regular_mtab(). |
3a5b1b1d KZ |
686 | * |
687 | * Returns: path to /etc/mtab or $LIBMOUNT_MTAB. | |
688 | */ | |
689 | const char *mnt_get_mtab_path(void) | |
690 | { | |
035507c8 | 691 | const char *p = safe_getenv("LIBMOUNT_MTAB"); |
3a5b1b1d KZ |
692 | return p ? : _PATH_MOUNTED; |
693 | } | |
694 | ||
77417bc0 KZ |
695 | /* |
696 | * Don't export this to libmount API -- utab is private library stuff. | |
be1a5180 | 697 | * |
a362ae60 | 698 | * Returns: path to /run/mount/utab (or /dev/.mount/utab) or $LIBMOUNT_UTAB. |
b37dd175 KZ |
699 | */ |
700 | const char *mnt_get_utab_path(void) | |
701 | { | |
a362ae60 | 702 | struct stat st; |
035507c8 | 703 | const char *p = safe_getenv("LIBMOUNT_UTAB"); |
a362ae60 KZ |
704 | |
705 | if (p) | |
706 | return p; | |
707 | ||
708 | if (stat(MNT_RUNTIME_TOPDIR, &st) == 0) | |
709 | return MNT_PATH_UTAB; | |
710 | ||
711 | return MNT_PATH_UTAB_OLD; | |
b37dd175 KZ |
712 | } |
713 | ||
d1be0c34 | 714 | |
b37dd175 KZ |
715 | /* returns file descriptor or -errno, @name returns uniques filename |
716 | */ | |
4b6cf485 | 717 | int mnt_open_uniq_filename(const char *filename, char **name) |
b37dd175 KZ |
718 | { |
719 | int rc, fd; | |
720 | char *n; | |
721 | ||
722 | assert(filename); | |
723 | ||
724 | if (name) | |
725 | *name = NULL; | |
726 | ||
727 | rc = asprintf(&n, "%s.XXXXXX", filename); | |
728 | if (rc <= 0) | |
729 | return -errno; | |
730 | ||
4b6cf485 | 731 | fd = mkstemp(n); |
b37dd175 KZ |
732 | if (fd >= 0 && name) |
733 | *name = n; | |
734 | else | |
735 | free(n); | |
736 | ||
737 | return fd < 0 ? -errno : fd; | |
738 | } | |
0bb44be3 | 739 | |
0bb44be3 KZ |
740 | char *mnt_get_mountpoint(const char *path) |
741 | { | |
742 | char *mnt = strdup(path); | |
743 | struct stat st; | |
744 | dev_t dir, base; | |
745 | ||
746 | if (!mnt) | |
747 | return NULL; | |
748 | if (*mnt == '/' && *(mnt + 1) == '\0') | |
9758c88a | 749 | goto done; |
0bb44be3 KZ |
750 | |
751 | if (stat(mnt, &st)) | |
752 | goto err; | |
753 | base = st.st_dev; | |
754 | ||
755 | do { | |
756 | char *p = stripoff_last_component(mnt); | |
757 | ||
758 | if (!p) | |
759 | break; | |
760 | if (stat(*mnt ? mnt : "/", &st)) | |
761 | goto err; | |
762 | dir = st.st_dev; | |
763 | if (dir != base) { | |
764 | *(p - 1) = '/'; | |
9758c88a | 765 | goto done; |
0bb44be3 KZ |
766 | } |
767 | base = dir; | |
768 | } while (mnt && *(mnt + 1) != '\0'); | |
769 | ||
770 | memcpy(mnt, "/", 2); | |
9758c88a | 771 | done: |
f84fa6f7 | 772 | DBG(UTILS, mnt_debug("%s mountpoint is %s", path, mnt)); |
9758c88a | 773 | return mnt; |
0bb44be3 KZ |
774 | err: |
775 | free(mnt); | |
776 | return NULL; | |
777 | } | |
778 | ||
9758c88a | 779 | char *mnt_get_fs_root(const char *path, const char *mnt) |
0bb44be3 | 780 | { |
f84fa6f7 | 781 | char *m = (char *) mnt, *res; |
0bb44be3 KZ |
782 | const char *p; |
783 | size_t sz; | |
784 | ||
9758c88a KZ |
785 | if (!m) |
786 | m = mnt_get_mountpoint(path); | |
787 | if (!m) | |
0bb44be3 KZ |
788 | return NULL; |
789 | ||
9758c88a | 790 | sz = strlen(m); |
0bb44be3 KZ |
791 | p = sz > 1 ? path + sz : path; |
792 | ||
9758c88a KZ |
793 | if (m != mnt) |
794 | free(m); | |
0bb44be3 | 795 | |
f84fa6f7 KZ |
796 | res = *p ? strdup(p) : strdup("/"); |
797 | DBG(UTILS, mnt_debug("%s fs-root is %s", path, res)); | |
798 | return res; | |
0bb44be3 KZ |
799 | } |
800 | ||
abc9c0f7 | 801 | #ifdef TEST_PROGRAM |
68164f6c | 802 | int test_match_fstype(struct libmnt_test *ts, int argc, char *argv[]) |
abc9c0f7 KZ |
803 | { |
804 | char *type = argv[1]; | |
805 | char *pattern = argv[2]; | |
806 | ||
807 | printf("%s\n", mnt_match_fstype(type, pattern) ? "MATCH" : "NOT-MATCH"); | |
808 | return 0; | |
809 | } | |
810 | ||
68164f6c | 811 | int test_match_options(struct libmnt_test *ts, int argc, char *argv[]) |
abc9c0f7 KZ |
812 | { |
813 | char *optstr = argv[1]; | |
814 | char *pattern = argv[2]; | |
815 | ||
816 | printf("%s\n", mnt_match_options(optstr, pattern) ? "MATCH" : "NOT-MATCH"); | |
817 | return 0; | |
818 | } | |
819 | ||
68164f6c | 820 | int test_startswith(struct libmnt_test *ts, int argc, char *argv[]) |
b49103ed KZ |
821 | { |
822 | char *optstr = argv[1]; | |
823 | char *pattern = argv[2]; | |
824 | ||
825 | printf("%s\n", startswith(optstr, pattern) ? "YES" : "NOT"); | |
826 | return 0; | |
827 | } | |
828 | ||
68164f6c | 829 | int test_endswith(struct libmnt_test *ts, int argc, char *argv[]) |
b49103ed KZ |
830 | { |
831 | char *optstr = argv[1]; | |
832 | char *pattern = argv[2]; | |
833 | ||
834 | printf("%s\n", endswith(optstr, pattern) ? "YES" : "NOT"); | |
835 | return 0; | |
836 | } | |
837 | ||
68164f6c | 838 | int test_mountpoint(struct libmnt_test *ts, int argc, char *argv[]) |
0bb44be3 KZ |
839 | { |
840 | char *path = canonicalize_path(argv[1]), | |
841 | *mnt = path ? mnt_get_mountpoint(path) : NULL; | |
842 | ||
843 | printf("%s: %s\n", argv[1], mnt ? : "unknown"); | |
844 | free(mnt); | |
845 | free(path); | |
846 | return 0; | |
847 | } | |
848 | ||
68164f6c | 849 | int test_fsroot(struct libmnt_test *ts, int argc, char *argv[]) |
0bb44be3 KZ |
850 | { |
851 | char *path = canonicalize_path(argv[1]), | |
d672fb26 | 852 | *mnt = path ? mnt_get_fs_root(path, NULL) : NULL; |
0bb44be3 KZ |
853 | |
854 | printf("%s: %s\n", argv[1], mnt ? : "unknown"); | |
855 | free(mnt); | |
856 | free(path); | |
857 | return 0; | |
858 | } | |
abc9c0f7 | 859 | |
68164f6c | 860 | int test_filesystems(struct libmnt_test *ts, int argc, char *argv[]) |
97e23b5e KZ |
861 | { |
862 | char **filesystems = NULL; | |
863 | int rc; | |
864 | ||
865 | rc = mnt_get_filesystems(&filesystems, argc ? argv[1] : NULL); | |
866 | if (!rc) { | |
867 | char **p; | |
868 | for (p = filesystems; *p; p++) | |
869 | printf("%s\n", *p); | |
870 | mnt_free_filesystems(filesystems); | |
871 | } | |
872 | return rc; | |
873 | } | |
874 | ||
66bb8267 KZ |
875 | int test_chdir(struct libmnt_test *ts, int argc, char *argv[]) |
876 | { | |
877 | int rc; | |
878 | char *path = canonicalize_path(argv[1]), | |
879 | *last = NULL; | |
880 | ||
881 | if (!path) | |
882 | return -errno; | |
883 | ||
884 | rc = mnt_chdir_to_parent(path, &last); | |
885 | if (!rc) { | |
886 | printf("path='%s', abs='%s', last='%s'\n", | |
887 | argv[1], path, last); | |
888 | } | |
889 | free(path); | |
890 | free(last); | |
891 | return rc; | |
892 | } | |
893 | ||
894 | ||
abc9c0f7 KZ |
895 | int main(int argc, char *argv[]) |
896 | { | |
68164f6c | 897 | struct libmnt_test tss[] = { |
abc9c0f7 KZ |
898 | { "--match-fstype", test_match_fstype, "<type> <pattern> FS types matching" }, |
899 | { "--match-options", test_match_options, "<options> <pattern> options matching" }, | |
97e23b5e | 900 | { "--filesystems", test_filesystems, "[<pattern>] list /{etc,proc}/filesystems" }, |
b49103ed KZ |
901 | { "--starts-with", test_startswith, "<string> <prefix>" }, |
902 | { "--ends-with", test_endswith, "<string> <prefix>" }, | |
0bb44be3 KZ |
903 | { "--mountpoint", test_mountpoint, "<path>" }, |
904 | { "--fs-root", test_fsroot, "<path>" }, | |
66bb8267 | 905 | { "--cd-parent", test_chdir, "<path>" }, |
abc9c0f7 KZ |
906 | { NULL } |
907 | }; | |
908 | ||
909 | return mnt_run_test(tss, argc, argv); | |
910 | } | |
911 | ||
912 | #endif /* TEST_PROGRAM */ |