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