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c84a633a KZ |
1 | /* |
2 | * Copyright (C) 2008 Karel Zak <kzak@redhat.com> | |
3 | * | |
4 | * This file is part of util-linux-ng. | |
5 | * | |
6 | * This file is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This file is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * The original namei(1) was writtent by: | |
17 | * Roger S. Southwick (May 2, 1990) | |
18 | * Steve Tell (March 28, 1991) | |
19 | * Arkadiusz Mikiewicz (1999-02-22) | |
20 | * Li Zefan (2007-09-10). | |
21 | */ | |
6dbe3af9 | 22 | #include <stdio.h> |
fd6b7a7f | 23 | #include <unistd.h> |
c84a633a | 24 | #include <getopt.h> |
fd6b7a7f | 25 | #include <string.h> |
2cccd0ff | 26 | #include <strings.h> |
66ee8158 | 27 | #include <stdlib.h> |
22853e4a | 28 | #include <errno.h> |
6dbe3af9 KZ |
29 | #include <sys/types.h> |
30 | #include <sys/stat.h> | |
31 | #include <sys/param.h> | |
c84a633a | 32 | #include <err.h> |
4cfcf09b KZ |
33 | #include <pwd.h> |
34 | #include <grp.h> | |
7eda085c | 35 | #include "nls.h" |
4cfcf09b | 36 | #include "widechar.h" |
6dbe3af9 | 37 | |
6dbe3af9 KZ |
38 | #ifndef MAXSYMLINKS |
39 | #define MAXSYMLINKS 256 | |
40 | #endif | |
41 | ||
e27a08ab KZ |
42 | #ifndef PATH_MAX |
43 | #define PATH_MAX 4096 | |
44 | #endif | |
45 | ||
4cfcf09b KZ |
46 | #ifndef LOGIN_NAME_MAX |
47 | #define LOGIN_NAME_MAX 256 | |
48 | #endif | |
49 | ||
c84a633a KZ |
50 | #define NAMEI_NOLINKS (1 << 1) |
51 | #define NAMEI_MODES (1 << 2) | |
52 | #define NAMEI_MNTS (1 << 3) | |
4cfcf09b | 53 | #define NAMEI_OWNERS (1 << 4) |
6dbe3af9 | 54 | |
db8a3e23 | 55 | |
c84a633a KZ |
56 | struct namei { |
57 | struct stat st; /* item lstat() */ | |
58 | char *name; /* item name */ | |
59 | char *abslink; /* absolute symlink path */ | |
60 | int relstart; /* offset of relative path in 'abslink' */ | |
61 | struct namei *next; /* next item */ | |
62 | int level; | |
63 | }; | |
6dbe3af9 | 64 | |
4cfcf09b KZ |
65 | struct idcache { |
66 | unsigned long int id; | |
67 | char *name; | |
68 | struct idcache *next; | |
69 | }; | |
70 | ||
71 | static int flags; | |
72 | static int uwidth; /* maximal width of username */ | |
73 | static int gwidth; /* maximal width of groupname */ | |
74 | static struct idcache *gcache; /* groupnames */ | |
75 | static struct idcache *ucache; /* usernames */ | |
76 | ||
77 | static struct idcache * | |
78 | get_id(struct idcache *ic, unsigned long int id) | |
79 | { | |
80 | while(ic) { | |
81 | if (ic->id == id) | |
82 | return ic; | |
83 | ic = ic->next; | |
84 | } | |
85 | return NULL; | |
86 | } | |
87 | ||
88 | static void | |
89 | free_idcache(struct idcache *ic) | |
90 | { | |
91 | while(ic) { | |
92 | struct idcache *next = ic->next; | |
93 | free(ic->name); | |
94 | free(ic); | |
95 | ic = next; | |
96 | } | |
97 | } | |
98 | ||
99 | static void | |
100 | add_id(struct idcache **ic, char *name, unsigned long int id, int *width) | |
101 | { | |
102 | struct idcache *nc, *x; | |
103 | int w = 0; | |
104 | ||
105 | nc = calloc(1, sizeof(*nc)); | |
106 | if (!nc) | |
107 | goto alloc_err; | |
108 | nc->id = id; | |
109 | ||
110 | if (name) { | |
111 | #ifdef HAVE_WIDECHAR | |
112 | wchar_t wc[LOGIN_NAME_MAX + 1]; | |
113 | ||
114 | if (mbstowcs(wc, name, LOGIN_NAME_MAX) > 0) { | |
115 | wc[LOGIN_NAME_MAX] = '\0'; | |
116 | w = wcswidth(wc, LOGIN_NAME_MAX); | |
117 | } | |
118 | else | |
119 | #endif | |
120 | w = strlen(name); | |
121 | } | |
122 | /* note, we ignore names with non-printable widechars */ | |
123 | if (w > 0) | |
124 | nc->name = strdup(name); | |
125 | else if (asprintf(&nc->name, "%lu", id) == -1) | |
126 | nc->name = NULL; | |
127 | if (!nc->name) | |
128 | goto alloc_err; | |
129 | ||
130 | for (x = *ic; x && x->next; x = x->next); | |
131 | ||
132 | /* add 'nc' at end of the 'ic' list */ | |
133 | if (x) | |
134 | x->next = nc; | |
135 | else | |
136 | *ic = nc; | |
137 | if (w <= 0) | |
138 | w = strlen(nc->name); | |
139 | *width = *width < w ? w : *width; | |
140 | ||
141 | return; | |
142 | alloc_err: | |
143 | err(EXIT_FAILURE, _("out of memory?")); | |
144 | } | |
145 | ||
146 | static void | |
147 | add_uid(unsigned long int id) | |
148 | { | |
149 | struct idcache *ic = get_id(ucache, id); | |
150 | ||
151 | if (!ic) { | |
152 | struct passwd *pw = getpwuid((uid_t) id); | |
153 | add_id(&ucache, pw ? pw->pw_name : NULL, id, &uwidth); | |
154 | } | |
155 | } | |
156 | ||
157 | static void | |
158 | add_gid(unsigned long int id) | |
159 | { | |
160 | struct idcache *ic = get_id(gcache, id); | |
161 | ||
162 | if (!ic) { | |
163 | struct group *gr = getgrgid((gid_t) id); | |
164 | add_id(&gcache, gr ? gr->gr_name : NULL, id, &gwidth); | |
165 | } | |
166 | } | |
167 | ||
c84a633a KZ |
168 | static void |
169 | free_namei(struct namei *nm) | |
170 | { | |
171 | while (nm) { | |
172 | struct namei *next = nm->next; | |
173 | free(nm->name); | |
174 | free(nm->abslink); | |
175 | free(nm); | |
176 | nm = next; | |
6dbe3af9 | 177 | } |
6dbe3af9 KZ |
178 | } |
179 | ||
22853e4a | 180 | static void |
c84a633a KZ |
181 | readlink_to_namei(struct namei *nm, const char *path) |
182 | { | |
183 | char sym[PATH_MAX]; | |
184 | size_t sz; | |
185 | ||
186 | sz = readlink(path, sym, sizeof(sym)); | |
187 | if (sz < 1) | |
188 | err(EXIT_FAILURE, _("failed to read symlink: %s"), path); | |
189 | if (*sym != '/') { | |
190 | char *p = strrchr(path, '/'); | |
191 | ||
192 | nm->relstart = p ? p - path : strlen(path); | |
193 | sz += nm->relstart + 1; | |
194 | } | |
195 | nm->abslink = malloc(sz + 1); | |
196 | if (!nm->abslink) | |
197 | err(EXIT_FAILURE, _("out of memory?")); | |
198 | ||
199 | if (*sym != '/') { | |
200 | memcpy(nm->abslink, path, nm->relstart); | |
201 | *(nm->abslink + nm->relstart) = '/'; | |
202 | nm->relstart++; | |
203 | memcpy(nm->abslink + nm->relstart, sym, sz); | |
204 | } else | |
205 | memcpy(nm->abslink, sym, sz); | |
206 | nm->abslink[sz] = '\0'; | |
6dbe3af9 KZ |
207 | } |
208 | ||
c84a633a KZ |
209 | static struct namei * |
210 | new_namei(struct namei *parent, const char *path, const char *fname, int lev) | |
211 | { | |
212 | struct namei *nm; | |
213 | ||
214 | if (!fname) | |
215 | return NULL; | |
216 | nm = calloc(1, sizeof(*nm)); | |
217 | if (!nm) | |
218 | err(EXIT_FAILURE, _("out of memory?")); | |
219 | if (parent) | |
220 | parent->next = nm; | |
221 | ||
222 | nm->level = lev; | |
223 | nm->name = strdup(fname); | |
224 | if (!nm->name) | |
225 | err(EXIT_FAILURE, _("out of memory?")); | |
226 | if (lstat(path, &nm->st) == -1) | |
227 | err(EXIT_FAILURE, _("could not stat '%s'"), path); | |
228 | return nm; | |
229 | } | |
6dbe3af9 | 230 | |
c84a633a KZ |
231 | static struct namei * |
232 | add_namei(struct namei *parent, const char *orgpath, int start, struct namei **last) | |
233 | { | |
234 | struct namei *nm = NULL, *first = NULL; | |
235 | char *fname, *end, *path; | |
236 | int level = 0; | |
237 | ||
238 | if (!orgpath) | |
239 | return NULL; | |
240 | if (parent) { | |
241 | nm = parent; | |
242 | level = parent->level + 1; | |
6dbe3af9 | 243 | } |
c84a633a KZ |
244 | path = strdup(orgpath); |
245 | if (!path) | |
246 | err(EXIT_FAILURE, _("out of memory?")); | |
247 | fname = path + start; | |
248 | ||
249 | /* root directory */ | |
250 | if (*fname == '/') { | |
251 | while (*fname == '/') | |
252 | fname++; /* eat extra '/' */ | |
253 | first = nm = new_namei(nm, "/", "/", level); | |
6dbe3af9 | 254 | } |
6dbe3af9 | 255 | |
c84a633a KZ |
256 | for (end = fname; fname && end; ) { |
257 | /* set end of filename */ | |
258 | end = strchr(fname, '/'); | |
259 | if (end) | |
260 | *end = '\0'; | |
261 | ||
262 | /* create a new entry */ | |
263 | nm = new_namei(nm, path, fname, level); | |
264 | if (!first) | |
265 | first = nm; | |
266 | if (S_ISLNK(nm->st.st_mode)) | |
267 | readlink_to_namei(nm, path); | |
4cfcf09b KZ |
268 | if (flags & NAMEI_OWNERS) { |
269 | add_uid(nm->st.st_uid); | |
270 | add_gid(nm->st.st_gid); | |
271 | } | |
c84a633a KZ |
272 | /* set begin of the next filename */ |
273 | if (end) { | |
274 | *end++ = '/'; | |
275 | while (*end == '/') | |
276 | end++; /* eat extra '/' */ | |
277 | } | |
278 | fname = end; | |
e8f26419 KZ |
279 | } |
280 | ||
c84a633a KZ |
281 | if (last) |
282 | *last = nm; | |
283 | return first; | |
284 | } | |
6dbe3af9 | 285 | |
6dbe3af9 | 286 | |
c84a633a KZ |
287 | static int |
288 | follow_symlinks(struct namei *nm) | |
289 | { | |
290 | int symcount = 0; | |
6dbe3af9 | 291 | |
c84a633a KZ |
292 | for (; nm; nm = nm->next) { |
293 | struct namei *next, *last; | |
6dbe3af9 | 294 | |
c84a633a KZ |
295 | if (!S_ISLNK(nm->st.st_mode)) |
296 | continue; | |
297 | if (++symcount > MAXSYMLINKS) { | |
298 | /* drop the rest of the list */ | |
299 | free_namei(nm->next); | |
300 | nm->next = NULL; | |
301 | return -1; | |
302 | } | |
303 | next = nm->next; | |
304 | nm->next = add_namei(nm, nm->abslink, nm->relstart, &last); | |
305 | if (last) | |
306 | last->next = next; | |
307 | else | |
308 | nm->next = next; | |
d8ef4c19 | 309 | } |
c84a633a KZ |
310 | return 0; |
311 | } | |
d8ef4c19 | 312 | |
c84a633a KZ |
313 | static void |
314 | strmode(mode_t mode, char *str) | |
315 | { | |
316 | if (S_ISDIR(mode)) | |
317 | str[0] = 'd'; | |
318 | else if (S_ISLNK(mode)) | |
319 | str[0] = 'l'; | |
320 | else if (S_ISCHR(mode)) | |
321 | str[0] = 'c'; | |
322 | else if (S_ISBLK(mode)) | |
323 | str[0] = 'b'; | |
324 | else if (S_ISSOCK(mode)) | |
325 | str[0] = 's'; | |
326 | else if (S_ISFIFO(mode)) | |
327 | str[0] = 'p'; | |
328 | else if (S_ISREG(mode)) | |
329 | str[0] = '-'; | |
330 | ||
331 | str[1] = mode & S_IRUSR ? 'r' : '-'; | |
332 | str[2] = mode & S_IWUSR ? 'w' : '-'; | |
333 | str[3] = (mode & S_ISUID | |
334 | ? (mode & S_IXUSR ? 's' : 'S') | |
335 | : (mode & S_IXUSR ? 'x' : '-')); | |
336 | str[4] = mode & S_IRGRP ? 'r' : '-'; | |
337 | str[5] = mode & S_IWGRP ? 'w' : '-'; | |
338 | str[6] = (mode & S_ISGID | |
339 | ? (mode & S_IXGRP ? 's' : 'S') | |
340 | : (mode & S_IXGRP ? 'x' : '-')); | |
341 | str[7] = mode & S_IROTH ? 'r' : '-'; | |
342 | str[8] = mode & S_IWOTH ? 'w' : '-'; | |
343 | str[9] = (mode & S_ISVTX | |
344 | ? (mode & S_IXOTH ? 't' : 'T') | |
345 | : (mode & S_IXOTH ? 'x' : '-')); | |
346 | str[10] = '\0'; | |
347 | } | |
6dbe3af9 | 348 | |
c84a633a KZ |
349 | static void |
350 | print_namei(struct namei *nm, char *path) | |
351 | { | |
352 | struct namei *prev = NULL; | |
353 | int i; | |
d8ef4c19 | 354 | |
c84a633a KZ |
355 | if (path) |
356 | printf("f: %s\n", path); | |
6dbe3af9 | 357 | |
c84a633a KZ |
358 | for (; nm; prev = nm, nm = nm->next) { |
359 | char md[11]; | |
db8a3e23 | 360 | |
c84a633a | 361 | strmode(nm->st.st_mode, md); |
6dbe3af9 | 362 | |
c84a633a KZ |
363 | if ((flags & NAMEI_MNTS) && prev && |
364 | S_ISDIR(nm->st.st_mode) && S_ISDIR(prev->st.st_mode) && | |
365 | prev->st.st_dev != nm->st.st_dev) | |
366 | md[0] = 'D'; | |
6dbe3af9 | 367 | |
c84a633a KZ |
368 | for (i = 0; i < nm->level; i++) |
369 | fputs(" ", stdout); | |
6dbe3af9 | 370 | |
c84a633a KZ |
371 | if (flags & NAMEI_MODES) |
372 | printf(" %s", md); | |
6dbe3af9 | 373 | else |
c84a633a | 374 | printf(" %c", md[0]); |
db8a3e23 | 375 | |
4cfcf09b KZ |
376 | if (flags & NAMEI_OWNERS) { |
377 | printf(" %-*s", uwidth, | |
378 | get_id(ucache, nm->st.st_uid)->name); | |
379 | printf(" %-*s", gwidth, | |
380 | get_id(gcache, nm->st.st_gid)->name); | |
381 | } | |
c84a633a KZ |
382 | if (S_ISLNK(nm->st.st_mode)) |
383 | printf(" %s -> %s\n", nm->name, | |
384 | nm->abslink + nm->relstart); | |
6dbe3af9 | 385 | else |
c84a633a KZ |
386 | printf(" %s\n", nm->name); |
387 | } | |
388 | } | |
db8a3e23 | 389 | |
c84a633a KZ |
390 | static void |
391 | usage(int rc) | |
392 | { | |
393 | const char *p = program_invocation_short_name; | |
6dbe3af9 | 394 | |
c84a633a KZ |
395 | if (!*p) |
396 | p = "namei"; | |
f062c8a6 | 397 | |
c84a633a KZ |
398 | printf(_("\nUsage: %s [options] pathname [pathname ...]\n"), p); |
399 | printf(_("\nOptions:\n")); | |
db8a3e23 | 400 | |
c84a633a KZ |
401 | printf(_( |
402 | " -h, --help displays this help text\n" | |
403 | " -x, --mountpoints show mount point directories with a 'D'\n" | |
404 | " -m, --modes show the mode bits of each file\n" | |
4cfcf09b KZ |
405 | " -o, --owners show owner and group name of each file\n" |
406 | " -l, --long use a long listing format (-m -o)\n" | |
c84a633a | 407 | " -n, --nosymlinks don't follow symlinks\n")); |
db8a3e23 | 408 | |
c84a633a KZ |
409 | printf(_("\nFor more information see namei(1).\n")); |
410 | exit(rc); | |
6dbe3af9 KZ |
411 | } |
412 | ||
c84a633a KZ |
413 | struct option longopts[] = |
414 | { | |
415 | { "help", 0, 0, 'h' }, | |
416 | { "mountpoints",0, 0, 'x' }, | |
417 | { "modes", 0, 0, 'm' }, | |
4cfcf09b KZ |
418 | { "owners", 0, 0, 'o' }, |
419 | { "long", 0, 0, 'l' }, | |
c84a633a KZ |
420 | { "nolinks", 0, 0, 'n' }, |
421 | { NULL, 0, 0, 0 }, | |
422 | }; | |
6dbe3af9 | 423 | |
c84a633a KZ |
424 | int |
425 | main(int argc, char **argv) | |
426 | { | |
427 | extern int optind; | |
428 | int c; | |
429 | ||
430 | setlocale(LC_ALL, ""); | |
431 | bindtextdomain(PACKAGE, LOCALEDIR); | |
432 | textdomain(PACKAGE); | |
433 | ||
434 | if (argc < 2) | |
435 | usage(EXIT_FAILURE); | |
436 | ||
4cfcf09b | 437 | while ((c = getopt_long(argc, argv, "+h?lmnox", longopts, NULL)) != -1) { |
c84a633a KZ |
438 | switch(c) { |
439 | case 'h': | |
440 | case '?': | |
441 | usage(EXIT_SUCCESS); | |
442 | break; | |
4cfcf09b KZ |
443 | case 'l': |
444 | flags |= (NAMEI_OWNERS | NAMEI_MODES); | |
445 | break; | |
c84a633a KZ |
446 | case 'm': |
447 | flags |= NAMEI_MODES; | |
448 | break; | |
c84a633a KZ |
449 | case 'n': |
450 | flags |= NAMEI_NOLINKS; | |
451 | break; | |
4cfcf09b KZ |
452 | case 'o': |
453 | flags |= NAMEI_OWNERS; | |
454 | break; | |
455 | case 'x': | |
456 | flags |= NAMEI_MNTS; | |
457 | break; | |
c84a633a | 458 | } |
6dbe3af9 | 459 | } |
c84a633a KZ |
460 | |
461 | for(; optind < argc; optind++) { | |
462 | char *path = argv[optind]; | |
463 | struct namei *nm = NULL; | |
464 | struct stat st; | |
465 | ||
466 | if (stat(path, &st) != 0) | |
467 | err(EXIT_FAILURE, _("failed to stat: %s"), path); | |
468 | ||
469 | nm = add_namei(NULL, path, 0, NULL); | |
470 | if (nm) { | |
471 | int sml = 0; | |
c84a633a KZ |
472 | if (!(flags & NAMEI_NOLINKS)) |
473 | sml = follow_symlinks(nm); | |
474 | print_namei(nm, path); | |
475 | free_namei(nm); | |
476 | if (sml == -1) | |
477 | errx(EXIT_FAILURE, | |
478 | _("%s: exceeded limit of symlinks"), | |
479 | path); | |
480 | } | |
6dbe3af9 KZ |
481 | } |
482 | ||
4cfcf09b KZ |
483 | free_idcache(ucache); |
484 | free_idcache(gcache); | |
485 | ||
c84a633a | 486 | return EXIT_SUCCESS; |
6dbe3af9 KZ |
487 | } |
488 |