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1 | /* | |
2 | * Copyright (C) 2008 Karel Zak <kzak@redhat.com> | |
3 | * | |
4 | * This file is part of util-linux. | |
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 written by: | |
17 | * Roger S. Southwick (May 2, 1990) | |
18 | * Steve Tell (March 28, 1991) | |
19 | * Arkadiusz MiĆkiewicz (1999-02-22) | |
20 | * Li Zefan (2007-09-10). | |
21 | */ | |
22 | ||
23 | #include <stdio.h> | |
24 | #include <unistd.h> | |
25 | #include <getopt.h> | |
26 | #include <string.h> | |
27 | #include <stdlib.h> | |
28 | #include <errno.h> | |
29 | #include <sys/types.h> | |
30 | #include <sys/stat.h> | |
31 | #include <sys/param.h> | |
32 | #include <pwd.h> | |
33 | #include <grp.h> | |
34 | ||
35 | #include "c.h" | |
36 | #include "xalloc.h" | |
37 | #include "nls.h" | |
38 | #include "widechar.h" | |
39 | #include "strutils.h" | |
40 | #include "closestream.h" | |
41 | #include "idcache.h" | |
42 | ||
43 | #ifndef MAXSYMLINKS | |
44 | #define MAXSYMLINKS 256 | |
45 | #endif | |
46 | ||
47 | #define NAMEI_NOLINKS (1 << 1) | |
48 | #define NAMEI_MODES (1 << 2) | |
49 | #define NAMEI_MNTS (1 << 3) | |
50 | #define NAMEI_OWNERS (1 << 4) | |
51 | #define NAMEI_VERTICAL (1 << 5) | |
52 | ||
53 | ||
54 | struct namei { | |
55 | struct stat st; /* item lstat() */ | |
56 | char *name; /* item name */ | |
57 | char *abslink; /* absolute symlink path */ | |
58 | int relstart; /* offset of relative path in 'abslink' */ | |
59 | struct namei *next; /* next item */ | |
60 | int level; | |
61 | int mountpoint; /* is mount point */ | |
62 | int noent; /* is this item not existing */ | |
63 | }; | |
64 | ||
65 | static int flags; | |
66 | static struct idcache *gcache; /* groupnames */ | |
67 | static struct idcache *ucache; /* usernames */ | |
68 | ||
69 | static void | |
70 | free_namei(struct namei *nm) | |
71 | { | |
72 | while (nm) { | |
73 | struct namei *next = nm->next; | |
74 | free(nm->name); | |
75 | free(nm->abslink); | |
76 | free(nm); | |
77 | nm = next; | |
78 | } | |
79 | } | |
80 | ||
81 | static void | |
82 | readlink_to_namei(struct namei *nm, const char *path) | |
83 | { | |
84 | char sym[PATH_MAX]; | |
85 | ssize_t sz; | |
86 | int isrel = 0; | |
87 | ||
88 | sz = readlink(path, sym, sizeof(sym)); | |
89 | if (sz < 1) | |
90 | err(EXIT_FAILURE, _("failed to read symlink: %s"), path); | |
91 | if (*sym != '/') { | |
92 | char *p = strrchr(path, '/'); | |
93 | ||
94 | if (p) { | |
95 | isrel = 1; | |
96 | nm->relstart = p - path; | |
97 | sz += nm->relstart + 1; | |
98 | } | |
99 | } | |
100 | nm->abslink = xmalloc(sz + 1); | |
101 | ||
102 | if (*sym != '/' && isrel) { | |
103 | /* create the absolute path from the relative symlink */ | |
104 | memcpy(nm->abslink, path, nm->relstart); | |
105 | *(nm->abslink + nm->relstart) = '/'; | |
106 | nm->relstart++; | |
107 | memcpy(nm->abslink + nm->relstart, sym, sz - nm->relstart); | |
108 | } else | |
109 | /* - absolute link (foo -> /path/bar) | |
110 | * - or link without any subdir (foo -> bar) | |
111 | */ | |
112 | memcpy(nm->abslink, sym, sz); | |
113 | ||
114 | nm->abslink[sz] = '\0'; | |
115 | } | |
116 | ||
117 | static struct stat * | |
118 | dotdot_stat(const char *dirname, struct stat *st) | |
119 | { | |
120 | char *path; | |
121 | size_t len; | |
122 | ||
123 | #define DOTDOTDIR "/.." | |
124 | ||
125 | if (!dirname) | |
126 | return NULL; | |
127 | ||
128 | len = strlen(dirname); | |
129 | path = xmalloc(len + sizeof(DOTDOTDIR)); | |
130 | ||
131 | memcpy(path, dirname, len); | |
132 | memcpy(path + len, DOTDOTDIR, sizeof(DOTDOTDIR)); | |
133 | ||
134 | if (stat(path, st)) | |
135 | err(EXIT_FAILURE, _("stat of %s failed"), path); | |
136 | free(path); | |
137 | return st; | |
138 | } | |
139 | ||
140 | static struct namei * | |
141 | new_namei(struct namei *parent, const char *path, const char *fname, int lev) | |
142 | { | |
143 | struct namei *nm; | |
144 | ||
145 | if (!fname) | |
146 | return NULL; | |
147 | nm = xcalloc(1, sizeof(*nm)); | |
148 | if (parent) | |
149 | parent->next = nm; | |
150 | ||
151 | nm->level = lev; | |
152 | nm->name = xstrdup(fname); | |
153 | ||
154 | nm->noent = (lstat(path, &nm->st) == -1); | |
155 | if (nm->noent) | |
156 | return nm; | |
157 | ||
158 | if (S_ISLNK(nm->st.st_mode)) | |
159 | readlink_to_namei(nm, path); | |
160 | if (flags & NAMEI_OWNERS) { | |
161 | add_uid(ucache, nm->st.st_uid); | |
162 | add_gid(gcache, nm->st.st_gid); | |
163 | } | |
164 | ||
165 | if ((flags & NAMEI_MNTS) && S_ISDIR(nm->st.st_mode)) { | |
166 | struct stat stbuf, *sb = NULL; | |
167 | ||
168 | if (parent && S_ISDIR(parent->st.st_mode)) | |
169 | sb = &parent->st; | |
170 | else if (!parent || S_ISLNK(parent->st.st_mode)) | |
171 | sb = dotdot_stat(path, &stbuf); | |
172 | ||
173 | if (sb && (sb->st_dev != nm->st.st_dev || /* different device */ | |
174 | sb->st_ino == nm->st.st_ino)) /* root directory */ | |
175 | nm->mountpoint = 1; | |
176 | } | |
177 | ||
178 | return nm; | |
179 | } | |
180 | ||
181 | static struct namei * | |
182 | add_namei(struct namei *parent, const char *orgpath, int start, struct namei **last) | |
183 | { | |
184 | struct namei *nm = NULL, *first = NULL; | |
185 | char *fname, *end, *path; | |
186 | int level = 0; | |
187 | ||
188 | if (!orgpath) | |
189 | return NULL; | |
190 | if (parent) { | |
191 | nm = parent; | |
192 | level = parent->level + 1; | |
193 | } | |
194 | path = xstrdup(orgpath); | |
195 | fname = path + start; | |
196 | ||
197 | /* root directory */ | |
198 | if (*fname == '/') { | |
199 | while (*fname == '/') | |
200 | fname++; /* eat extra '/' */ | |
201 | first = nm = new_namei(nm, "/", "/", level); | |
202 | } | |
203 | ||
204 | for (end = fname; fname && end; ) { | |
205 | /* set end of filename */ | |
206 | if (*fname) { | |
207 | end = strchr(fname, '/'); | |
208 | if (end) | |
209 | *end = '\0'; | |
210 | ||
211 | /* create a new entry */ | |
212 | nm = new_namei(nm, path, fname, level); | |
213 | } else | |
214 | end = NULL; | |
215 | if (!first) | |
216 | first = nm; | |
217 | /* set begin of the next filename */ | |
218 | if (end) { | |
219 | *end++ = '/'; | |
220 | while (*end == '/') | |
221 | end++; /* eat extra '/' */ | |
222 | } | |
223 | fname = end; | |
224 | } | |
225 | ||
226 | if (last) | |
227 | *last = nm; | |
228 | ||
229 | free(path); | |
230 | ||
231 | return first; | |
232 | } | |
233 | ||
234 | static int | |
235 | follow_symlinks(struct namei *nm) | |
236 | { | |
237 | int symcount = 0; | |
238 | ||
239 | for (; nm; nm = nm->next) { | |
240 | struct namei *next, *last; | |
241 | ||
242 | if (nm->noent) | |
243 | continue; | |
244 | if (!S_ISLNK(nm->st.st_mode)) | |
245 | continue; | |
246 | if (++symcount > MAXSYMLINKS) { | |
247 | /* drop the rest of the list */ | |
248 | free_namei(nm->next); | |
249 | nm->next = NULL; | |
250 | return -1; | |
251 | } | |
252 | next = nm->next; | |
253 | nm->next = add_namei(nm, nm->abslink, nm->relstart, &last); | |
254 | if (last) | |
255 | last->next = next; | |
256 | else | |
257 | nm->next = next; | |
258 | } | |
259 | return 0; | |
260 | } | |
261 | ||
262 | static int | |
263 | print_namei(struct namei *nm, char *path) | |
264 | { | |
265 | int i; | |
266 | ||
267 | if (path) | |
268 | printf("f: %s\n", path); | |
269 | ||
270 | for (; nm; nm = nm->next) { | |
271 | char md[11]; | |
272 | ||
273 | if (nm->noent) { | |
274 | int blanks = 1; | |
275 | if (flags & NAMEI_MODES) | |
276 | blanks += 9; | |
277 | if (flags & NAMEI_OWNERS) | |
278 | blanks += ucache->width + gcache->width + 2; | |
279 | if (!(flags & NAMEI_VERTICAL)) | |
280 | blanks += 1; | |
281 | blanks += nm->level * 2; | |
282 | printf("%*s ", blanks, ""); | |
283 | printf(_("%s - No such file or directory\n"), nm->name); | |
284 | return -1; | |
285 | } | |
286 | ||
287 | xstrmode(nm->st.st_mode, md); | |
288 | ||
289 | if (nm->mountpoint) | |
290 | md[0] = 'D'; | |
291 | ||
292 | if (!(flags & NAMEI_VERTICAL)) { | |
293 | for (i = 0; i < nm->level; i++) | |
294 | fputs(" ", stdout); | |
295 | fputc(' ', stdout); | |
296 | } | |
297 | ||
298 | if (flags & NAMEI_MODES) | |
299 | printf("%s", md); | |
300 | else | |
301 | printf("%c", md[0]); | |
302 | ||
303 | if (flags & NAMEI_OWNERS) { | |
304 | printf(" %-*s", ucache->width, | |
305 | get_id(ucache, nm->st.st_uid)->name); | |
306 | printf(" %-*s", gcache->width, | |
307 | get_id(gcache, nm->st.st_gid)->name); | |
308 | } | |
309 | ||
310 | if (flags & NAMEI_VERTICAL) | |
311 | for (i = 0; i < nm->level; i++) | |
312 | fputs(" ", stdout); | |
313 | ||
314 | if (S_ISLNK(nm->st.st_mode)) | |
315 | printf(" %s -> %s\n", nm->name, | |
316 | nm->abslink + nm->relstart); | |
317 | else | |
318 | printf(" %s\n", nm->name); | |
319 | } | |
320 | return 0; | |
321 | } | |
322 | ||
323 | static void usage(int rc) | |
324 | { | |
325 | const char *p = program_invocation_short_name; | |
326 | FILE *out = rc == EXIT_FAILURE ? stderr : stdout; | |
327 | ||
328 | if (!*p) | |
329 | p = "namei"; | |
330 | ||
331 | fputs(USAGE_HEADER, out); | |
332 | fprintf(out, | |
333 | _(" %s [options] <pathname>...\n"), p); | |
334 | ||
335 | fputs(USAGE_SEPARATOR, out); | |
336 | fputs(_("Follow a pathname until a terminal point is found.\n"), out); | |
337 | ||
338 | fputs(USAGE_OPTIONS, out); | |
339 | fputs(_(" -h, --help displays this help text\n" | |
340 | " -V, --version output version information and exit\n" | |
341 | " -x, --mountpoints show mount point directories with a 'D'\n" | |
342 | " -m, --modes show the mode bits of each file\n" | |
343 | " -o, --owners show owner and group name of each file\n" | |
344 | " -l, --long use a long listing format (-m -o -v) \n" | |
345 | " -n, --nosymlinks don't follow symlinks\n" | |
346 | " -v, --vertical vertical align of modes and owners\n"), out); | |
347 | ||
348 | fprintf(out, USAGE_MAN_TAIL("namei(1)")); | |
349 | exit(rc); | |
350 | } | |
351 | ||
352 | static const struct option longopts[] = | |
353 | { | |
354 | { "help", 0, 0, 'h' }, | |
355 | { "version", 0, 0, 'V' }, | |
356 | { "mountpoints",0, 0, 'x' }, | |
357 | { "modes", 0, 0, 'm' }, | |
358 | { "owners", 0, 0, 'o' }, | |
359 | { "long", 0, 0, 'l' }, | |
360 | { "nolinks", 0, 0, 'n' }, | |
361 | { "vertical", 0, 0, 'v' }, | |
362 | { NULL, 0, 0, 0 }, | |
363 | }; | |
364 | ||
365 | int | |
366 | main(int argc, char **argv) | |
367 | { | |
368 | int c; | |
369 | int rc = EXIT_SUCCESS; | |
370 | ||
371 | setlocale(LC_ALL, ""); | |
372 | bindtextdomain(PACKAGE, LOCALEDIR); | |
373 | textdomain(PACKAGE); | |
374 | atexit(close_stdout); | |
375 | ||
376 | while ((c = getopt_long(argc, argv, "hVlmnovx", longopts, NULL)) != -1) { | |
377 | switch(c) { | |
378 | case 'h': | |
379 | usage(EXIT_SUCCESS); | |
380 | break; | |
381 | case 'V': | |
382 | printf(UTIL_LINUX_VERSION); | |
383 | return EXIT_SUCCESS; | |
384 | case 'l': | |
385 | flags |= (NAMEI_OWNERS | NAMEI_MODES | NAMEI_VERTICAL); | |
386 | break; | |
387 | case 'm': | |
388 | flags |= NAMEI_MODES; | |
389 | break; | |
390 | case 'n': | |
391 | flags |= NAMEI_NOLINKS; | |
392 | break; | |
393 | case 'o': | |
394 | flags |= NAMEI_OWNERS; | |
395 | break; | |
396 | case 'x': | |
397 | flags |= NAMEI_MNTS; | |
398 | break; | |
399 | case 'v': | |
400 | flags |= NAMEI_VERTICAL; | |
401 | break; | |
402 | default: | |
403 | usage(EXIT_FAILURE); | |
404 | } | |
405 | } | |
406 | ||
407 | if (optind == argc) { | |
408 | warnx(_("pathname argument is missing")); | |
409 | usage(EXIT_FAILURE); | |
410 | } | |
411 | ||
412 | ucache = new_idcache(); | |
413 | if (!ucache) | |
414 | err(EXIT_FAILURE, _("failed to allocate UID cache")); | |
415 | gcache = new_idcache(); | |
416 | if (!gcache) | |
417 | err(EXIT_FAILURE, _("failed to allocate GID cache")); | |
418 | ||
419 | for(; optind < argc; optind++) { | |
420 | char *path = argv[optind]; | |
421 | struct namei *nm = NULL; | |
422 | struct stat st; | |
423 | ||
424 | if (stat(path, &st) != 0) | |
425 | rc = EXIT_FAILURE; | |
426 | ||
427 | nm = add_namei(NULL, path, 0, NULL); | |
428 | if (nm) { | |
429 | int sml = 0; | |
430 | if (!(flags & NAMEI_NOLINKS)) | |
431 | sml = follow_symlinks(nm); | |
432 | if (print_namei(nm, path)) { | |
433 | rc = EXIT_FAILURE; | |
434 | continue; | |
435 | } | |
436 | free_namei(nm); | |
437 | if (sml == -1) { | |
438 | rc = EXIT_FAILURE; | |
439 | warnx(_("%s: exceeded limit of symlinks"), path); | |
440 | continue; | |
441 | } | |
442 | } | |
443 | } | |
444 | ||
445 | free_idcache(ucache); | |
446 | free_idcache(gcache); | |
447 | ||
448 | return rc; | |
449 | } | |
450 |