1 /*-
2 * Copyright (c) 1990, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #if 0
31 #ifndef lint
32 static const char copyright[] =
33 "@(#) Copyright (c) 1990, 1993, 1994\n\
34 The Regents of the University of California. All rights reserved.\n";
35 #endif /* not lint */
36
37 #ifndef lint
38 static char sccsid[] = "@(#)rm.c 8.5 (Berkeley) 4/18/94";
39 #endif /* not lint */
40 #endif
41 #include <sys/cdefs.h>
42 __FBSDID("$FreeBSD$");
43
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 <stdint.h>
56 #include <stdio.h>
57 #include <stdlib.h>
58 #include <string.h>
59 #include <sysexits.h>
60 #include <unistd.h>
61
62 static int dflag, eval, fflag, iflag, Pflag, vflag, Wflag, stdin_ok;
63 static int rflag, Iflag, xflag;
64 static uid_t uid;
65 static volatile sig_atomic_t info;
66
67 static int check(const char *, const char *, struct stat *);
68 static int check2(char **);
69 static void checkdot(char **);
70 static void checkslash(char **);
71 static void rm_file(char **);
72 static int rm_overwrite(const char *, struct stat *);
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 while (getopt(argc, argv, "") != -1)
103 usage();
104 argc -= optind;
105 argv += optind;
106 if (argc != 1)
107 usage();
108 rm_file(&argv[0]);
109 exit(eval);
110 }
111
112 Pflag = rflag = xflag = 0;
113 while ((ch = getopt(argc, argv, "dfiIPRrvWx")) != -1)
114 switch(ch) {
115 case 'd':
116 dflag = 1;
117 break;
118 case 'f':
119 fflag = 1;
120 iflag = 0;
121 break;
122 case 'i':
123 fflag = 0;
124 iflag = 1;
125 break;
126 case 'I':
127 Iflag = 1;
128 break;
129 case 'P':
130 Pflag = 1;
131 break;
132 case 'R':
133 case 'r': /* Compatibility. */
134 rflag = 1;
135 break;
136 case 'v':
137 vflag = 1;
138 break;
139 case 'W':
140 Wflag = 1;
141 break;
142 case 'x':
143 xflag = 1;
144 break;
145 default:
146 usage();
147 }
148 argc -= optind;
149 argv += optind;
150
151 if (argc < 1) {
152 if (fflag)
153 return (0);
154 usage();
155 }
156
157 checkdot(argv);
158 checkslash(argv);
159 uid = geteuid();
160
161 (void)signal(SIGINFO, siginfo);
162 if (*argv) {
163 stdin_ok = isatty(STDIN_FILENO);
164
165 if (Iflag) {
166 if (check2(argv) == 0)
167 exit (1);
168 }
169 if (rflag)
170 rm_tree(argv);
171 else
172 rm_file(argv);
173 }
174
175 exit (eval);
176 }
177
178 static void
rm_tree(char ** argv)179 rm_tree(char **argv)
180 {
181 FTS *fts;
182 FTSENT *p;
183 int needstat;
184 int flags;
185 int rval;
186
187 /*
188 * Remove a file hierarchy. If forcing removal (-f), or interactive
189 * (-i) or can't ask anyway (stdin_ok), don't stat the file.
190 */
191 needstat = !uid || (!fflag && !iflag && stdin_ok);
192
193 /*
194 * If the -i option is specified, the user can skip on the pre-order
195 * visit. The fts_number field flags skipped directories.
196 */
197 #define SKIPPED 1
198
199 flags = FTS_PHYSICAL;
200 if (!needstat)
201 flags |= FTS_NOSTAT;
202 if (Wflag)
203 flags |= FTS_WHITEOUT;
204 if (xflag)
205 flags |= FTS_XDEV;
206 if (!(fts = fts_open(argv, flags, NULL))) {
207 if (fflag && errno == ENOENT)
208 return;
209 err(1, "fts_open");
210 }
211 while ((p = fts_read(fts)) != NULL) {
212 switch (p->fts_info) {
213 case FTS_DNR:
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_ERR:
221 errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno));
222 case FTS_NS:
223 /*
224 * Assume that since fts_read() couldn't stat the
225 * file, it can't be unlinked.
226 */
227 if (!needstat)
228 break;
229 if (!fflag || p->fts_errno != ENOENT) {
230 warnx("%s: %s",
231 p->fts_path, strerror(p->fts_errno));
232 eval = 1;
233 }
234 continue;
235 case FTS_D:
236 /* Pre-order: give user chance to skip. */
237 if (!fflag && !check(p->fts_path, p->fts_accpath,
238 p->fts_statp)) {
239 (void)fts_set(fts, p, FTS_SKIP);
240 p->fts_number = SKIPPED;
241 }
242 else if (!uid &&
243 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
244 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
245 lchflags(p->fts_accpath,
246 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)) < 0)
247 goto err;
248 continue;
249 case FTS_DP:
250 /* Post-order: see if user skipped. */
251 if (p->fts_number == SKIPPED)
252 continue;
253 break;
254 default:
255 if (!fflag &&
256 !check(p->fts_path, p->fts_accpath, p->fts_statp))
257 continue;
258 }
259
260 rval = 0;
261 if (!uid &&
262 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
263 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)))
264 rval = lchflags(p->fts_accpath,
265 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE));
266 if (rval == 0) {
267 /*
268 * If we can't read or search the directory, may still be
269 * able to remove it. Don't print out the un{read,search}able
270 * message unless the remove fails.
271 */
272 switch (p->fts_info) {
273 case FTS_DP:
274 case FTS_DNR:
275 rval = rmdir(p->fts_accpath);
276 if (rval == 0 || (fflag && errno == ENOENT)) {
277 if (rval == 0 && vflag)
278 (void)printf("%s\n",
279 p->fts_path);
280 if (rval == 0 && info) {
281 info = 0;
282 (void)printf("%s\n",
283 p->fts_path);
284 }
285 continue;
286 }
287 break;
288
289 case FTS_W:
290 rval = undelete(p->fts_accpath);
291 if (rval == 0 && (fflag && errno == ENOENT)) {
292 if (vflag)
293 (void)printf("%s\n",
294 p->fts_path);
295 if (info) {
296 info = 0;
297 (void)printf("%s\n",
298 p->fts_path);
299 }
300 continue;
301 }
302 break;
303
304 case FTS_NS:
305 /*
306 * Assume that since fts_read() couldn't stat
307 * the file, it can't be unlinked.
308 */
309 if (fflag)
310 continue;
311 /* FALLTHROUGH */
312
313 case FTS_F:
314 case FTS_NSOK:
315 if (Pflag)
316 if (!rm_overwrite(p->fts_accpath, p->fts_info ==
317 FTS_NSOK ? NULL : p->fts_statp))
318 continue;
319 /* FALLTHROUGH */
320
321 default:
322 rval = unlink(p->fts_accpath);
323 if (rval == 0 || (fflag && errno == ENOENT)) {
324 if (rval == 0 && vflag)
325 (void)printf("%s\n",
326 p->fts_path);
327 if (rval == 0 && info) {
328 info = 0;
329 (void)printf("%s\n",
330 p->fts_path);
331 }
332 continue;
333 }
334 }
335 }
336 err:
337 warn("%s", p->fts_path);
338 eval = 1;
339 }
340 if (!fflag && errno)
341 err(1, "fts_read");
342 fts_close(fts);
343 }
344
345 static void
rm_file(char ** argv)346 rm_file(char **argv)
347 {
348 struct stat sb;
349 int rval;
350 char *f;
351
352 /*
353 * Remove a file. POSIX 1003.2 states that, by default, attempting
354 * to remove a directory is an error, so must always stat the file.
355 */
356 while ((f = *argv++) != NULL) {
357 /* Assume if can't stat the file, can't unlink it. */
358 if (lstat(f, &sb)) {
359 if (Wflag) {
360 sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR;
361 } else {
362 if (!fflag || errno != ENOENT) {
363 warn("%s", f);
364 eval = 1;
365 }
366 continue;
367 }
368 } else if (Wflag) {
369 warnx("%s: %s", f, strerror(EEXIST));
370 eval = 1;
371 continue;
372 }
373
374 if (S_ISDIR(sb.st_mode) && !dflag) {
375 warnx("%s: is a directory", f);
376 eval = 1;
377 continue;
378 }
379 if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb))
380 continue;
381 rval = 0;
382 if (!uid && !S_ISWHT(sb.st_mode) &&
383 (sb.st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
384 !(sb.st_flags & (SF_APPEND|SF_IMMUTABLE)))
385 rval = lchflags(f, sb.st_flags & ~(UF_APPEND|UF_IMMUTABLE));
386 if (rval == 0) {
387 if (S_ISWHT(sb.st_mode))
388 rval = undelete(f);
389 else if (S_ISDIR(sb.st_mode))
390 rval = rmdir(f);
391 else {
392 if (Pflag)
393 if (!rm_overwrite(f, &sb))
394 continue;
395 rval = unlink(f);
396 }
397 }
398 if (rval && (!fflag || errno != ENOENT)) {
399 warn("%s", f);
400 eval = 1;
401 }
402 if (vflag && rval == 0)
403 (void)printf("%s\n", f);
404 if (info && rval == 0) {
405 info = 0;
406 (void)printf("%s\n", f);
407 }
408 }
409 }
410
411 /*
412 * rm_overwrite --
413 * Overwrite the file 3 times with varying bit patterns.
414 *
415 * XXX
416 * This is a cheap way to *really* delete files. Note that only regular
417 * files are deleted, directories (and therefore names) will remain.
418 * Also, this assumes a fixed-block file system (like FFS, or a V7 or a
419 * System V file system). In a logging or COW file system, you'll have to
420 * have kernel support.
421 */
422 static int
rm_overwrite(const char * file,struct stat * sbp)423 rm_overwrite(const char *file, struct stat *sbp)
424 {
425 struct stat sb, sb2;
426 struct statfs fsb;
427 off_t len;
428 int bsize, fd, wlen;
429 char *buf = NULL;
430
431 fd = -1;
432 if (sbp == NULL) {
433 if (lstat(file, &sb))
434 goto err;
435 sbp = &sb;
436 }
437 if (!S_ISREG(sbp->st_mode))
438 return (1);
439 if (sbp->st_nlink > 1 && !fflag) {
440 warnx("%s (inode %ju): not overwritten due to multiple links",
441 file, (uintmax_t)sbp->st_ino);
442 return (0);
443 }
444 if ((fd = open(file, O_WRONLY|O_NONBLOCK|O_NOFOLLOW, 0)) == -1)
445 goto err;
446 if (fstat(fd, &sb2))
447 goto err;
448 if (sb2.st_dev != sbp->st_dev || sb2.st_ino != sbp->st_ino ||
449 !S_ISREG(sb2.st_mode)) {
450 errno = EPERM;
451 goto err;
452 }
453 if (fstatfs(fd, &fsb) == -1)
454 goto err;
455 bsize = MAX(fsb.f_iosize, 1024);
456 if ((buf = malloc(bsize)) == NULL)
457 err(1, "%s: malloc", file);
458
459 #define PASS(byte) { \
460 memset(buf, byte, bsize); \
461 for (len = sbp->st_size; len > 0; len -= wlen) { \
462 wlen = len < bsize ? len : bsize; \
463 if (write(fd, buf, wlen) != wlen) \
464 goto err; \
465 } \
466 }
467 PASS(0xff);
468 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
469 goto err;
470 PASS(0x00);
471 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
472 goto err;
473 PASS(0xff);
474 if (!fsync(fd) && !close(fd)) {
475 free(buf);
476 return (1);
477 }
478
479 err: eval = 1;
480 if (buf)
481 free(buf);
482 if (fd != -1)
483 close(fd);
484 warn("%s", file);
485 return (0);
486 }
487
488
489 static int
check(const char * path,const char * name,struct stat * sp)490 check(const char *path, const char *name, struct stat *sp)
491 {
492 int ch, first;
493 char modep[15], *flagsp;
494
495 /* Check -i first. */
496 if (iflag)
497 (void)fprintf(stderr, "remove %s? ", path);
498 else {
499 /*
500 * If it's not a symbolic link and it's unwritable and we're
501 * talking to a terminal, ask. Symbolic links are excluded
502 * because their permissions are meaningless. Check stdin_ok
503 * first because we may not have stat'ed the file.
504 */
505 if (!stdin_ok || S_ISLNK(sp->st_mode) ||
506 (!access(name, W_OK) &&
507 !(sp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
508 (!(sp->st_flags & (UF_APPEND|UF_IMMUTABLE)) || !uid)))
509 return (1);
510 strmode(sp->st_mode, modep);
511 if ((flagsp = fflagstostr(sp->st_flags)) == NULL)
512 err(1, "fflagstostr");
513 if (Pflag)
514 errx(1,
515 "%s: -P was specified, but file is not writable",
516 path);
517 (void)fprintf(stderr, "override %s%s%s/%s %s%sfor %s? ",
518 modep + 1, modep[9] == ' ' ? "" : " ",
519 user_from_uid(sp->st_uid, 0),
520 group_from_gid(sp->st_gid, 0),
521 *flagsp ? flagsp : "", *flagsp ? " " : "",
522 path);
523 free(flagsp);
524 }
525 (void)fflush(stderr);
526
527 first = ch = getchar();
528 while (ch != '\n' && ch != EOF)
529 ch = getchar();
530 return (first == 'y' || first == 'Y');
531 }
532
533 #define ISSLASH(a) ((a)[0] == '/' && (a)[1] == '\0')
534 static void
checkslash(char ** argv)535 checkslash(char **argv)
536 {
537 char **t, **u;
538 int complained;
539
540 complained = 0;
541 for (t = argv; *t;) {
542 if (ISSLASH(*t)) {
543 if (!complained++)
544 warnx("\"/\" may not be removed");
545 eval = 1;
546 for (u = t; u[0] != NULL; ++u)
547 u[0] = u[1];
548 } else {
549 ++t;
550 }
551 }
552 }
553
554 static int
check2(char ** argv)555 check2(char **argv)
556 {
557 struct stat st;
558 int first;
559 int ch;
560 int fcount = 0;
561 int dcount = 0;
562 int i;
563 const char *dname = NULL;
564
565 for (i = 0; argv[i]; ++i) {
566 if (lstat(argv[i], &st) == 0) {
567 if (S_ISDIR(st.st_mode)) {
568 ++dcount;
569 dname = argv[i]; /* only used if 1 dir */
570 } else {
571 ++fcount;
572 }
573 }
574 }
575 first = 0;
576 while (first != 'n' && first != 'N' && first != 'y' && first != 'Y') {
577 if (dcount && rflag) {
578 fprintf(stderr, "recursively remove");
579 if (dcount == 1)
580 fprintf(stderr, " %s", dname);
581 else
582 fprintf(stderr, " %d dirs", dcount);
583 if (fcount == 1)
584 fprintf(stderr, " and 1 file");
585 else if (fcount > 1)
586 fprintf(stderr, " and %d files", fcount);
587 } else if (dcount + fcount > 3) {
588 fprintf(stderr, "remove %d files", dcount + fcount);
589 } else {
590 return(1);
591 }
592 fprintf(stderr, "? ");
593 fflush(stderr);
594
595 first = ch = getchar();
596 while (ch != '\n' && ch != EOF)
597 ch = getchar();
598 if (ch == EOF)
599 break;
600 }
601 return (first == 'y' || first == 'Y');
602 }
603
604 #define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2])))
605 static void
checkdot(char ** argv)606 checkdot(char **argv)
607 {
608 char *p, **save, **t;
609 int complained;
610
611 complained = 0;
612 for (t = argv; *t;) {
613 if ((p = strrchr(*t, '/')) != NULL)
614 ++p;
615 else
616 p = *t;
617 if (ISDOT(p)) {
618 if (!complained++)
619 warnx("\".\" and \"..\" may not be removed");
620 eval = 1;
621 for (save = t; (t[0] = t[1]) != NULL; ++t)
622 continue;
623 t = save;
624 } else
625 ++t;
626 }
627 }
628
629 static void
usage(void)630 usage(void)
631 {
632
633 (void)fprintf(stderr, "%s\n%s\n",
634 "usage: rm [-f | -i] [-dIPRrvWx] file ...",
635 " unlink file");
636 exit(EX_USAGE);
637 }
638
639 static void
siginfo(int sig __unused)640 siginfo(int sig __unused)
641 {
642
643 info = 1;
644 }
645