1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1990, 1993, 1994
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/stat.h>
33 #include <sys/param.h>
34 #include <sys/mount.h>
35
36 #include <err.h>
37 #include <errno.h>
38 #include <fcntl.h>
39 #include <fts.h>
40 #include <grp.h>
41 #include <locale.h>
42 #include <pwd.h>
43 #include <stdio.h>
44 #include <stdlib.h>
45 #include <string.h>
46 #include <sysexits.h>
47 #include <unistd.h>
48
49 static int dflag, eval, fflag, iflag, vflag, Wflag, stdin_ok;
50 static int rflag, Iflag, xflag;
51 static uid_t uid;
52 static volatile sig_atomic_t info;
53
54 static int check(const char *, const char *, struct stat *);
55 static int check2(char **);
56 static void checkdot(char **);
57 static void checkslash(char **);
58 static void rm_file(char **);
59 static void rm_tree(char **);
60 static void siginfo(int __unused);
61 static void usage(void);
62
63 /*
64 * rm --
65 * This rm is different from historic rm's, but is expected to match
66 * POSIX 1003.2 behavior. The most visible difference is that -f
67 * has two specific effects now, ignore non-existent files and force
68 * file removal.
69 */
70 int
main(int argc,char * argv[])71 main(int argc, char *argv[])
72 {
73 int ch;
74 char *p;
75
76 (void)setlocale(LC_ALL, "");
77
78 /*
79 * Test for the special case where the utility is called as
80 * "unlink", for which the functionality provided is greatly
81 * simplified.
82 */
83 if ((p = strrchr(argv[0], '/')) == NULL)
84 p = argv[0];
85 else
86 ++p;
87 if (strcmp(p, "unlink") == 0) {
88 if (argc == 2)
89 rm_file(&argv[1]);
90 else if (argc == 3 && strcmp(argv[1], "--") == 0)
91 rm_file(&argv[2]);
92 else
93 usage();
94 exit(eval);
95 }
96
97 rflag = xflag = 0;
98 while ((ch = getopt(argc, argv, "dfiIPRrvWx")) != -1)
99 switch(ch) {
100 case 'd':
101 dflag = 1;
102 break;
103 case 'f':
104 fflag = 1;
105 iflag = 0;
106 break;
107 case 'i':
108 fflag = 0;
109 iflag = 1;
110 break;
111 case 'I':
112 Iflag = 1;
113 break;
114 case 'P':
115 /* Compatibility no-op. */
116 break;
117 case 'R':
118 case 'r': /* Compatibility. */
119 rflag = 1;
120 break;
121 case 'v':
122 vflag = 1;
123 break;
124 case 'W':
125 Wflag = 1;
126 break;
127 case 'x':
128 xflag = 1;
129 break;
130 default:
131 usage();
132 }
133 argc -= optind;
134 argv += optind;
135
136 if (argc < 1) {
137 if (fflag)
138 return (0);
139 usage();
140 }
141
142 checkdot(argv);
143 checkslash(argv);
144 uid = geteuid();
145
146 (void)signal(SIGINFO, siginfo);
147 if (*argv) {
148 stdin_ok = isatty(STDIN_FILENO);
149
150 if (Iflag) {
151 if (check2(argv) == 0)
152 exit (1);
153 }
154 if (rflag)
155 rm_tree(argv);
156 else
157 rm_file(argv);
158 }
159
160 exit (eval);
161 }
162
163 static void
rm_tree(char ** argv)164 rm_tree(char **argv)
165 {
166 FTS *fts;
167 FTSENT *p;
168 int needstat;
169 int flags;
170 int rval;
171
172 /*
173 * Remove a file hierarchy. If forcing removal (-f), or interactive
174 * (-i) or can't ask anyway (stdin_ok), don't stat the file.
175 */
176 needstat = !uid || (!fflag && !iflag && stdin_ok);
177
178 /*
179 * If the -i option is specified, the user can skip on the pre-order
180 * visit. The fts_number field flags skipped directories.
181 */
182 #define SKIPPED 1
183
184 flags = FTS_PHYSICAL;
185 if (!needstat)
186 flags |= FTS_NOSTAT;
187 if (Wflag)
188 flags |= FTS_WHITEOUT;
189 if (xflag)
190 flags |= FTS_XDEV;
191 if (!(fts = fts_open(argv, flags, NULL))) {
192 if (fflag && errno == ENOENT)
193 return;
194 err(1, "fts_open");
195 }
196 while (errno = 0, (p = fts_read(fts)) != NULL) {
197 switch (p->fts_info) {
198 case FTS_DNR:
199 if (!fflag || p->fts_errno != ENOENT) {
200 warnx("%s: %s",
201 p->fts_path, strerror(p->fts_errno));
202 eval = 1;
203 }
204 continue;
205 case FTS_ERR:
206 errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno));
207 case FTS_NS:
208 /*
209 * Assume that since fts_read() couldn't stat the
210 * file, it can't be unlinked.
211 */
212 if (!needstat)
213 break;
214 if (!fflag || p->fts_errno != ENOENT) {
215 warnx("%s: %s",
216 p->fts_path, strerror(p->fts_errno));
217 eval = 1;
218 }
219 continue;
220 case FTS_D:
221 /* Pre-order: give user chance to skip. */
222 if (!fflag && !check(p->fts_path, p->fts_accpath,
223 p->fts_statp)) {
224 (void)fts_set(fts, p, FTS_SKIP);
225 p->fts_number = SKIPPED;
226 }
227 else if (!uid &&
228 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
229 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
230 lchflags(p->fts_accpath,
231 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)) < 0)
232 goto err;
233 continue;
234 case FTS_DP:
235 /* Post-order: see if user skipped. */
236 if (p->fts_number == SKIPPED)
237 continue;
238 break;
239 default:
240 if (!fflag &&
241 !check(p->fts_path, p->fts_accpath, p->fts_statp))
242 continue;
243 }
244
245 rval = 0;
246 if (!uid &&
247 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
248 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)))
249 rval = lchflags(p->fts_accpath,
250 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE));
251 if (rval == 0) {
252 /*
253 * If we can't read or search the directory, may still be
254 * able to remove it. Don't print out the un{read,search}able
255 * message unless the remove fails.
256 */
257 switch (p->fts_info) {
258 case FTS_DP:
259 case FTS_DNR:
260 rval = rmdir(p->fts_accpath);
261 if (rval == 0 || (fflag && errno == ENOENT)) {
262 if (rval == 0 && vflag)
263 (void)printf("%s\n",
264 p->fts_path);
265 if (rval == 0 && info) {
266 info = 0;
267 (void)printf("%s\n",
268 p->fts_path);
269 }
270 continue;
271 }
272 break;
273
274 case FTS_W:
275 rval = undelete(p->fts_accpath);
276 if (rval == 0 && (fflag && errno == ENOENT)) {
277 if (vflag)
278 (void)printf("%s\n",
279 p->fts_path);
280 if (info) {
281 info = 0;
282 (void)printf("%s\n",
283 p->fts_path);
284 }
285 continue;
286 }
287 break;
288
289 case FTS_NS:
290 /*
291 * Assume that since fts_read() couldn't stat
292 * the file, it can't be unlinked.
293 */
294 if (fflag)
295 continue;
296 /* FALLTHROUGH */
297
298 case FTS_F:
299 case FTS_NSOK:
300 default:
301 rval = unlink(p->fts_accpath);
302 if (rval == 0 || (fflag && errno == ENOENT)) {
303 if (rval == 0 && vflag)
304 (void)printf("%s\n",
305 p->fts_path);
306 if (rval == 0 && info) {
307 info = 0;
308 (void)printf("%s\n",
309 p->fts_path);
310 }
311 continue;
312 }
313 }
314 }
315 err:
316 warn("%s", p->fts_path);
317 eval = 1;
318 }
319 if (!fflag && errno)
320 err(1, "fts_read");
321 fts_close(fts);
322 }
323
324 static void
rm_file(char ** argv)325 rm_file(char **argv)
326 {
327 struct stat sb;
328 int rval;
329 char *f;
330
331 /*
332 * Remove a file. POSIX 1003.2 states that, by default, attempting
333 * to remove a directory is an error, so must always stat the file.
334 */
335 while ((f = *argv++) != NULL) {
336 /* Assume if can't stat the file, can't unlink it. */
337 if (lstat(f, &sb)) {
338 if (Wflag) {
339 sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR;
340 } else {
341 if (!fflag || errno != ENOENT) {
342 warn("%s", f);
343 eval = 1;
344 }
345 continue;
346 }
347 } else if (Wflag) {
348 warnx("%s: %s", f, strerror(EEXIST));
349 eval = 1;
350 continue;
351 }
352
353 if (S_ISDIR(sb.st_mode) && !dflag) {
354 warnx("%s: is a directory", f);
355 eval = 1;
356 continue;
357 }
358 if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb))
359 continue;
360 rval = 0;
361 if (!uid && !S_ISWHT(sb.st_mode) &&
362 (sb.st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
363 !(sb.st_flags & (SF_APPEND|SF_IMMUTABLE)))
364 rval = lchflags(f, sb.st_flags & ~(UF_APPEND|UF_IMMUTABLE));
365 if (rval == 0) {
366 if (S_ISWHT(sb.st_mode))
367 rval = undelete(f);
368 else if (S_ISDIR(sb.st_mode))
369 rval = rmdir(f);
370 else
371 rval = unlink(f);
372 }
373 if (rval && (!fflag || errno != ENOENT)) {
374 warn("%s", f);
375 eval = 1;
376 }
377 if (vflag && rval == 0)
378 (void)printf("%s\n", f);
379 if (info && rval == 0) {
380 info = 0;
381 (void)printf("%s\n", f);
382 }
383 }
384 }
385
386 static int
check(const char * path,const char * name,struct stat * sp)387 check(const char *path, const char *name, struct stat *sp)
388 {
389 int ch, first;
390 char modep[15], *flagsp;
391
392 /* Check -i first. */
393 if (iflag)
394 (void)fprintf(stderr, "remove %s? ", path);
395 else {
396 /*
397 * If it's not a symbolic link and it's unwritable and we're
398 * talking to a terminal, ask. Symbolic links are excluded
399 * because their permissions are meaningless. Check stdin_ok
400 * first because we may not have stat'ed the file.
401 */
402 if (!stdin_ok || S_ISLNK(sp->st_mode) ||
403 (!access(name, W_OK) &&
404 !(sp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
405 (!(sp->st_flags & (UF_APPEND|UF_IMMUTABLE)) || !uid)))
406 return (1);
407 strmode(sp->st_mode, modep);
408 if ((flagsp = fflagstostr(sp->st_flags)) == NULL)
409 err(1, "fflagstostr");
410 (void)fprintf(stderr, "override %s%s%s/%s %s%sfor %s? ",
411 modep + 1, modep[10] == ' ' ? "" : " ",
412 user_from_uid(sp->st_uid, 0),
413 group_from_gid(sp->st_gid, 0),
414 *flagsp ? flagsp : "", *flagsp ? " " : "",
415 path);
416 free(flagsp);
417 }
418 (void)fflush(stderr);
419
420 first = ch = getchar();
421 while (ch != '\n' && ch != EOF)
422 ch = getchar();
423 return (first == 'y' || first == 'Y');
424 }
425
426 #define ISSLASH(a) ((a)[0] == '/' && (a)[1] == '\0')
427 static void
checkslash(char ** argv)428 checkslash(char **argv)
429 {
430 char **t, **u;
431 int complained;
432
433 complained = 0;
434 for (t = argv; *t;) {
435 if (ISSLASH(*t)) {
436 if (!complained++)
437 warnx("\"/\" may not be removed");
438 eval = 1;
439 for (u = t; u[0] != NULL; ++u)
440 u[0] = u[1];
441 } else {
442 ++t;
443 }
444 }
445 }
446
447 static int
check2(char ** argv)448 check2(char **argv)
449 {
450 struct stat st;
451 int first;
452 int ch;
453 int fcount = 0;
454 int dcount = 0;
455 int i;
456 const char *dname = NULL;
457
458 for (i = 0; argv[i]; ++i) {
459 if (lstat(argv[i], &st) == 0) {
460 if (S_ISDIR(st.st_mode)) {
461 ++dcount;
462 dname = argv[i]; /* only used if 1 dir */
463 } else {
464 ++fcount;
465 }
466 }
467 }
468 first = 0;
469 while (first != 'n' && first != 'N' && first != 'y' && first != 'Y') {
470 if (dcount && rflag) {
471 fprintf(stderr, "recursively remove");
472 if (dcount == 1)
473 fprintf(stderr, " %s", dname);
474 else
475 fprintf(stderr, " %d dirs", dcount);
476 if (fcount == 1)
477 fprintf(stderr, " and 1 file");
478 else if (fcount > 1)
479 fprintf(stderr, " and %d files", fcount);
480 } else if (dcount + fcount > 3) {
481 fprintf(stderr, "remove %d files", dcount + fcount);
482 } else {
483 return(1);
484 }
485 fprintf(stderr, "? ");
486 fflush(stderr);
487
488 first = ch = getchar();
489 while (ch != '\n' && ch != EOF)
490 ch = getchar();
491 if (ch == EOF)
492 break;
493 }
494 return (first == 'y' || first == 'Y');
495 }
496
497 #define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2])))
498 static void
checkdot(char ** argv)499 checkdot(char **argv)
500 {
501 char *p, **save, **t;
502 int complained;
503
504 complained = 0;
505 for (t = argv; *t;) {
506 if ((p = strrchr(*t, '/')) != NULL)
507 ++p;
508 else
509 p = *t;
510 if (ISDOT(p)) {
511 if (!complained++)
512 warnx("\".\" and \"..\" may not be removed");
513 eval = 1;
514 for (save = t; (t[0] = t[1]) != NULL; ++t)
515 continue;
516 t = save;
517 } else
518 ++t;
519 }
520 }
521
522 static void
usage(void)523 usage(void)
524 {
525
526 (void)fprintf(stderr, "%s\n%s\n",
527 "usage: rm [-f | -i] [-dIPRrvWx] file ...",
528 " unlink [--] file");
529 exit(EX_USAGE);
530 }
531
532 static void
siginfo(int sig __unused)533 siginfo(int sig __unused)
534 {
535
536 info = 1;
537 }
538