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 #if 0
33 #ifndef lint
34 static const char copyright[] =
35 "@(#) Copyright (c) 1990, 1993, 1994\n\
36 The Regents of the University of California. All rights reserved.\n";
37 #endif /* not lint */
38
39 #ifndef lint
40 static char sccsid[] = "@(#)rm.c 8.5 (Berkeley) 4/18/94";
41 #endif /* not lint */
42 #endif
43 #include <sys/cdefs.h>
44 __FBSDID("$FreeBSD$");
45
46 #include <sys/stat.h>
47 #include <sys/param.h>
48 #include <sys/mount.h>
49
50 #include <err.h>
51 #include <errno.h>
52 #include <fcntl.h>
53 #include <fts.h>
54 #include <grp.h>
55 #include <locale.h>
56 #include <pwd.h>
57 #include <stdio.h>
58 #include <stdlib.h>
59 #include <string.h>
60 #include <sysexits.h>
61 #include <unistd.h>
62
63 static int dflag, eval, fflag, iflag, vflag, Wflag, stdin_ok;
64 static int rflag, Iflag, xflag;
65 static uid_t uid;
66 static volatile sig_atomic_t info;
67
68 static int check(const char *, const char *, struct stat *);
69 static int check2(char **);
70 static void checkdot(char **);
71 static void checkslash(char **);
72 static void rm_file(char **);
73 static void rm_tree(char **);
74 static void siginfo(int __unused);
75 static void usage(void);
76
77 /*
78 * rm --
79 * This rm is different from historic rm's, but is expected to match
80 * POSIX 1003.2 behavior. The most visible difference is that -f
81 * has two specific effects now, ignore non-existent files and force
82 * file removal.
83 */
84 int
main(int argc,char * argv[])85 main(int argc, char *argv[])
86 {
87 int ch;
88 char *p;
89
90 (void)setlocale(LC_ALL, "");
91
92 /*
93 * Test for the special case where the utility is called as
94 * "unlink", for which the functionality provided is greatly
95 * simplified.
96 */
97 if ((p = strrchr(argv[0], '/')) == NULL)
98 p = argv[0];
99 else
100 ++p;
101 if (strcmp(p, "unlink") == 0) {
102 if (argc == 2)
103 rm_file(&argv[1]);
104 else if (argc == 3 && strcmp(argv[1], "--") == 0)
105 rm_file(&argv[2]);
106 else
107 usage();
108 exit(eval);
109 }
110
111 rflag = xflag = 0;
112 while ((ch = getopt(argc, argv, "dfiIPRrvWx")) != -1)
113 switch(ch) {
114 case 'd':
115 dflag = 1;
116 break;
117 case 'f':
118 fflag = 1;
119 iflag = 0;
120 break;
121 case 'i':
122 fflag = 0;
123 iflag = 1;
124 break;
125 case 'I':
126 Iflag = 1;
127 break;
128 case 'P':
129 /* Compatibility no-op. */
130 break;
131 case 'R':
132 case 'r': /* Compatibility. */
133 rflag = 1;
134 break;
135 case 'v':
136 vflag = 1;
137 break;
138 case 'W':
139 Wflag = 1;
140 break;
141 case 'x':
142 xflag = 1;
143 break;
144 default:
145 usage();
146 }
147 argc -= optind;
148 argv += optind;
149
150 if (argc < 1) {
151 if (fflag)
152 return (0);
153 usage();
154 }
155
156 checkdot(argv);
157 checkslash(argv);
158 uid = geteuid();
159
160 (void)signal(SIGINFO, siginfo);
161 if (*argv) {
162 stdin_ok = isatty(STDIN_FILENO);
163
164 if (Iflag) {
165 if (check2(argv) == 0)
166 exit (1);
167 }
168 if (rflag)
169 rm_tree(argv);
170 else
171 rm_file(argv);
172 }
173
174 exit (eval);
175 }
176
177 static void
rm_tree(char ** argv)178 rm_tree(char **argv)
179 {
180 FTS *fts;
181 FTSENT *p;
182 int needstat;
183 int flags;
184 int rval;
185
186 /*
187 * Remove a file hierarchy. If forcing removal (-f), or interactive
188 * (-i) or can't ask anyway (stdin_ok), don't stat the file.
189 */
190 needstat = !uid || (!fflag && !iflag && stdin_ok);
191
192 /*
193 * If the -i option is specified, the user can skip on the pre-order
194 * visit. The fts_number field flags skipped directories.
195 */
196 #define SKIPPED 1
197
198 flags = FTS_PHYSICAL;
199 if (!needstat)
200 flags |= FTS_NOSTAT;
201 if (Wflag)
202 flags |= FTS_WHITEOUT;
203 if (xflag)
204 flags |= FTS_XDEV;
205 if (!(fts = fts_open(argv, flags, NULL))) {
206 if (fflag && errno == ENOENT)
207 return;
208 err(1, "fts_open");
209 }
210 while (errno = 0, (p = fts_read(fts)) != NULL) {
211 switch (p->fts_info) {
212 case FTS_DNR:
213 if (!fflag || p->fts_errno != ENOENT) {
214 warnx("%s: %s",
215 p->fts_path, strerror(p->fts_errno));
216 eval = 1;
217 }
218 continue;
219 case FTS_ERR:
220 errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno));
221 case FTS_NS:
222 /*
223 * Assume that since fts_read() couldn't stat the
224 * file, it can't be unlinked.
225 */
226 if (!needstat)
227 break;
228 if (!fflag || p->fts_errno != ENOENT) {
229 warnx("%s: %s",
230 p->fts_path, strerror(p->fts_errno));
231 eval = 1;
232 }
233 continue;
234 case FTS_D:
235 /* Pre-order: give user chance to skip. */
236 if (!fflag && !check(p->fts_path, p->fts_accpath,
237 p->fts_statp)) {
238 (void)fts_set(fts, p, FTS_SKIP);
239 p->fts_number = SKIPPED;
240 }
241 else if (!uid &&
242 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
243 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
244 lchflags(p->fts_accpath,
245 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)) < 0)
246 goto err;
247 continue;
248 case FTS_DP:
249 /* Post-order: see if user skipped. */
250 if (p->fts_number == SKIPPED)
251 continue;
252 break;
253 default:
254 if (!fflag &&
255 !check(p->fts_path, p->fts_accpath, p->fts_statp))
256 continue;
257 }
258
259 rval = 0;
260 if (!uid &&
261 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
262 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)))
263 rval = lchflags(p->fts_accpath,
264 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE));
265 if (rval == 0) {
266 /*
267 * If we can't read or search the directory, may still be
268 * able to remove it. Don't print out the un{read,search}able
269 * message unless the remove fails.
270 */
271 switch (p->fts_info) {
272 case FTS_DP:
273 case FTS_DNR:
274 rval = rmdir(p->fts_accpath);
275 if (rval == 0 || (fflag && errno == ENOENT)) {
276 if (rval == 0 && vflag)
277 (void)printf("%s\n",
278 p->fts_path);
279 if (rval == 0 && info) {
280 info = 0;
281 (void)printf("%s\n",
282 p->fts_path);
283 }
284 continue;
285 }
286 break;
287
288 case FTS_W:
289 rval = undelete(p->fts_accpath);
290 if (rval == 0 && (fflag && errno == ENOENT)) {
291 if (vflag)
292 (void)printf("%s\n",
293 p->fts_path);
294 if (info) {
295 info = 0;
296 (void)printf("%s\n",
297 p->fts_path);
298 }
299 continue;
300 }
301 break;
302
303 case FTS_NS:
304 /*
305 * Assume that since fts_read() couldn't stat
306 * the file, it can't be unlinked.
307 */
308 if (fflag)
309 continue;
310 /* FALLTHROUGH */
311
312 case FTS_F:
313 case FTS_NSOK:
314 default:
315 rval = unlink(p->fts_accpath);
316 if (rval == 0 || (fflag && errno == ENOENT)) {
317 if (rval == 0 && vflag)
318 (void)printf("%s\n",
319 p->fts_path);
320 if (rval == 0 && info) {
321 info = 0;
322 (void)printf("%s\n",
323 p->fts_path);
324 }
325 continue;
326 }
327 }
328 }
329 err:
330 warn("%s", p->fts_path);
331 eval = 1;
332 }
333 if (!fflag && errno)
334 err(1, "fts_read");
335 fts_close(fts);
336 }
337
338 static void
rm_file(char ** argv)339 rm_file(char **argv)
340 {
341 struct stat sb;
342 int rval;
343 char *f;
344
345 /*
346 * Remove a file. POSIX 1003.2 states that, by default, attempting
347 * to remove a directory is an error, so must always stat the file.
348 */
349 while ((f = *argv++) != NULL) {
350 /* Assume if can't stat the file, can't unlink it. */
351 if (lstat(f, &sb)) {
352 if (Wflag) {
353 sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR;
354 } else {
355 if (!fflag || errno != ENOENT) {
356 warn("%s", f);
357 eval = 1;
358 }
359 continue;
360 }
361 } else if (Wflag) {
362 warnx("%s: %s", f, strerror(EEXIST));
363 eval = 1;
364 continue;
365 }
366
367 if (S_ISDIR(sb.st_mode) && !dflag) {
368 warnx("%s: is a directory", f);
369 eval = 1;
370 continue;
371 }
372 if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb))
373 continue;
374 rval = 0;
375 if (!uid && !S_ISWHT(sb.st_mode) &&
376 (sb.st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
377 !(sb.st_flags & (SF_APPEND|SF_IMMUTABLE)))
378 rval = lchflags(f, sb.st_flags & ~(UF_APPEND|UF_IMMUTABLE));
379 if (rval == 0) {
380 if (S_ISWHT(sb.st_mode))
381 rval = undelete(f);
382 else if (S_ISDIR(sb.st_mode))
383 rval = rmdir(f);
384 else
385 rval = unlink(f);
386 }
387 if (rval && (!fflag || errno != ENOENT)) {
388 warn("%s", f);
389 eval = 1;
390 }
391 if (vflag && rval == 0)
392 (void)printf("%s\n", f);
393 if (info && rval == 0) {
394 info = 0;
395 (void)printf("%s\n", f);
396 }
397 }
398 }
399
400 static int
check(const char * path,const char * name,struct stat * sp)401 check(const char *path, const char *name, struct stat *sp)
402 {
403 int ch, first;
404 char modep[15], *flagsp;
405
406 /* Check -i first. */
407 if (iflag)
408 (void)fprintf(stderr, "remove %s? ", path);
409 else {
410 /*
411 * If it's not a symbolic link and it's unwritable and we're
412 * talking to a terminal, ask. Symbolic links are excluded
413 * because their permissions are meaningless. Check stdin_ok
414 * first because we may not have stat'ed the file.
415 */
416 if (!stdin_ok || S_ISLNK(sp->st_mode) ||
417 (!access(name, W_OK) &&
418 !(sp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
419 (!(sp->st_flags & (UF_APPEND|UF_IMMUTABLE)) || !uid)))
420 return (1);
421 strmode(sp->st_mode, modep);
422 if ((flagsp = fflagstostr(sp->st_flags)) == NULL)
423 err(1, "fflagstostr");
424 (void)fprintf(stderr, "override %s%s%s/%s %s%sfor %s? ",
425 modep + 1, modep[10] == ' ' ? "" : " ",
426 user_from_uid(sp->st_uid, 0),
427 group_from_gid(sp->st_gid, 0),
428 *flagsp ? flagsp : "", *flagsp ? " " : "",
429 path);
430 free(flagsp);
431 }
432 (void)fflush(stderr);
433
434 first = ch = getchar();
435 while (ch != '\n' && ch != EOF)
436 ch = getchar();
437 return (first == 'y' || first == 'Y');
438 }
439
440 #define ISSLASH(a) ((a)[0] == '/' && (a)[1] == '\0')
441 static void
checkslash(char ** argv)442 checkslash(char **argv)
443 {
444 char **t, **u;
445 int complained;
446
447 complained = 0;
448 for (t = argv; *t;) {
449 if (ISSLASH(*t)) {
450 if (!complained++)
451 warnx("\"/\" may not be removed");
452 eval = 1;
453 for (u = t; u[0] != NULL; ++u)
454 u[0] = u[1];
455 } else {
456 ++t;
457 }
458 }
459 }
460
461 static int
check2(char ** argv)462 check2(char **argv)
463 {
464 struct stat st;
465 int first;
466 int ch;
467 int fcount = 0;
468 int dcount = 0;
469 int i;
470 const char *dname = NULL;
471
472 for (i = 0; argv[i]; ++i) {
473 if (lstat(argv[i], &st) == 0) {
474 if (S_ISDIR(st.st_mode)) {
475 ++dcount;
476 dname = argv[i]; /* only used if 1 dir */
477 } else {
478 ++fcount;
479 }
480 }
481 }
482 first = 0;
483 while (first != 'n' && first != 'N' && first != 'y' && first != 'Y') {
484 if (dcount && rflag) {
485 fprintf(stderr, "recursively remove");
486 if (dcount == 1)
487 fprintf(stderr, " %s", dname);
488 else
489 fprintf(stderr, " %d dirs", dcount);
490 if (fcount == 1)
491 fprintf(stderr, " and 1 file");
492 else if (fcount > 1)
493 fprintf(stderr, " and %d files", fcount);
494 } else if (dcount + fcount > 3) {
495 fprintf(stderr, "remove %d files", dcount + fcount);
496 } else {
497 return(1);
498 }
499 fprintf(stderr, "? ");
500 fflush(stderr);
501
502 first = ch = getchar();
503 while (ch != '\n' && ch != EOF)
504 ch = getchar();
505 if (ch == EOF)
506 break;
507 }
508 return (first == 'y' || first == 'Y');
509 }
510
511 #define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2])))
512 static void
checkdot(char ** argv)513 checkdot(char **argv)
514 {
515 char *p, **save, **t;
516 int complained;
517
518 complained = 0;
519 for (t = argv; *t;) {
520 if ((p = strrchr(*t, '/')) != NULL)
521 ++p;
522 else
523 p = *t;
524 if (ISDOT(p)) {
525 if (!complained++)
526 warnx("\".\" and \"..\" may not be removed");
527 eval = 1;
528 for (save = t; (t[0] = t[1]) != NULL; ++t)
529 continue;
530 t = save;
531 } else
532 ++t;
533 }
534 }
535
536 static void
usage(void)537 usage(void)
538 {
539
540 (void)fprintf(stderr, "%s\n%s\n",
541 "usage: rm [-f | -i] [-dIPRrvWx] file ...",
542 " unlink [--] file");
543 exit(EX_USAGE);
544 }
545
546 static void
siginfo(int sig __unused)547 siginfo(int sig __unused)
548 {
549
550 info = 1;
551 }
552