Fix some WARNS6 regression that crept up in the last days.
[dragonfly.git] / bin / rm / rm.c
CommitLineData
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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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
1de703da
MD
32 *
33 * @(#) Copyright (c) 1990, 1993, 1994 The Regents of the University of California. All rights reserved.
34 * @(#)rm.c 8.5 (Berkeley) 4/18/94
35 * $FreeBSD: src/bin/rm/rm.c,v 1.29.2.5 2002/07/12 07:25:48 tjr Exp $
eccf6cca 36 * $DragonFly: src/bin/rm/rm.c,v 1.19 2006/11/12 00:51:47 swildner Exp $
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37 */
38
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39#include <sys/stat.h>
40#include <sys/param.h>
41#include <sys/mount.h>
68c91344 42#include <sys/ioctl.h>
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43
44#include <err.h>
45#include <errno.h>
46#include <fcntl.h>
47#include <fts.h>
5b0d3e5e
SW
48#include <grp.h>
49#include <pwd.h>
1d2358df 50#include <signal.h>
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51#include <stdio.h>
52#include <stdlib.h>
53#include <string.h>
54#include <sysexits.h>
55#include <unistd.h>
56
1d2358df
VBD
57static int dflag, eval, fflag, iflag, Pflag, vflag, Wflag, stdin_ok;
58static int rflag, Iflag;
59static uid_t uid;
60volatile sig_atomic_t info;
984263bc 61
e13bfb74
LF
62static int check(const char *, const char *, struct stat *);
63static int check2(char **);
64static void checkdot(char **);
65static void rm_file(char **);
66static int rm_overwrite(const char *, struct stat *);
67static void rm_tree(char **);
1d2358df 68static void siginfo(int);
e13bfb74 69static void usage(void);
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70
71/*
72 * rm --
73 * This rm is different from historic rm's, but is expected to match
74 * POSIX 1003.2 behavior. The most visible difference is that -f
75 * has two specific effects now, ignore non-existent files and force
76 * file removal.
77 */
78int
79main(int argc, char *argv[])
80{
28242317 81 int ch;
620ab84e 82 const char *p;
68c91344 83 pid_t tty_pgrp;
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84
85 /*
86 * Test for the special case where the utility is called as
87 * "unlink", for which the functionality provided is greatly
88 * simplified.
89 */
17b61719 90 if ((p = strrchr(argv[0], '/')) == NULL)
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MD
91 p = argv[0];
92 else
93 ++p;
94 if (strcmp(p, "unlink") == 0) {
95 while (getopt(argc, argv, "") != -1)
96 usage();
97 argc -= optind;
98 argv += optind;
99 if (argc != 1)
100 usage();
101 rm_file(&argv[0]);
102 exit(eval);
103 }
104
105 Pflag = rflag = 0;
64a3a712 106 while ((ch = getopt(argc, argv, "dfiIPRrvW")) != -1) {
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107 switch(ch) {
108 case 'd':
109 dflag = 1;
110 break;
111 case 'f':
112 fflag = 1;
113 iflag = 0;
114 break;
115 case 'i':
116 fflag = 0;
117 iflag = 1;
118 break;
28242317 119 case 'I':
68c91344
MD
120 /*
121 * The -I flag is intended to be generally aliasable
122 * in /etc/csh.cshrc. We apply it only to foreground
123 * processes.
124 */
125 if (ioctl(0, TIOCGPGRP, &tty_pgrp) == 0) {
126 if (tty_pgrp == getpgrp())
127 Iflag = 1;
128 }
28242317 129 break;
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130 case 'P':
131 Pflag = 1;
132 break;
133 case 'R':
134 case 'r': /* Compatibility. */
135 rflag = 1;
136 break;
137 case 'v':
138 vflag = 1;
139 break;
140 case 'W':
141 Wflag = 1;
142 break;
143 default:
144 usage();
145 }
64a3a712 146 }
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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 uid = geteuid();
1d2358df
VBD
158
159 signal(SIGINFO, siginfo);
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160
161 if (*argv) {
162 stdin_ok = isatty(STDIN_FILENO);
163
64a3a712 164 if (Iflag && !iflag) {
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MD
165 if (check2(argv) == 0)
166 exit (1);
167 }
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168 if (rflag)
169 rm_tree(argv);
170 else
171 rm_file(argv);
172 }
173
174 exit (eval);
175}
176
e13bfb74 177static void
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178rm_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;
620ab84e
LF
203 if ((fts = fts_open(argv, flags, NULL)) == NULL) {
204 if (fflag && errno == ENOENT)
205 return;
984263bc 206 err(1, NULL);
620ab84e 207 }
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MD
208 while ((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:
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LF
220 /*
221 * Assume that since fts_read() couldn't stat
222 * the file, it can't be unlinked.
223 */
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MD
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)) {
57fed2af 236 fts_set(fts, p, FTS_SKIP);
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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 chflags(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
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VBD
257 if (info) {
258 info = 0;
259 fprintf(stderr, "Currently removing: %s\n", p->fts_path);
260 }
261
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262 rval = 0;
263 if (!uid &&
264 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
265 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)))
266 rval = chflags(p->fts_accpath,
267 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE));
1d2358df 268
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269 if (rval == 0) {
270 /*
271 * If we can't read or search the directory, may still be
272 * able to remove it. Don't print out the un{read,search}able
273 * message unless the remove fails.
274 */
275 switch (p->fts_info) {
276 case FTS_DP:
277 case FTS_DNR:
278 rval = rmdir(p->fts_accpath);
279 if (rval == 0 || (fflag && errno == ENOENT)) {
280 if (rval == 0 && vflag)
57fed2af 281 printf("%s\n",
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MD
282 p->fts_path);
283 continue;
284 }
285 break;
286
287 case FTS_W:
288 rval = undelete(p->fts_accpath);
289 if (rval == 0 && (fflag && errno == ENOENT)) {
290 if (vflag)
57fed2af 291 printf("%s\n",
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292 p->fts_path);
293 continue;
294 }
295 break;
296
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297 case FTS_NS:
298 /*
299 * Assume that since fts_read() couldn't stat
300 * the file, it can't be unlinked.
301 */
302 if (fflag)
303 continue;
304 /* FALLTHROUGH */
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305 default:
306 if (Pflag)
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LF
307 if (!rm_overwrite(p->fts_accpath, NULL))
308 continue;
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MD
309 rval = unlink(p->fts_accpath);
310 if (rval == 0 || (fflag && errno == ENOENT)) {
311 if (rval == 0 && vflag)
57fed2af 312 printf("%s\n",
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313 p->fts_path);
314 continue;
315 }
316 }
317 }
318err:
319 warn("%s", p->fts_path);
320 eval = 1;
321 }
322 if (errno)
323 err(1, "fts_read");
356438f3 324 fts_close(fts);
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MD
325}
326
e13bfb74 327static void
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328rm_file(char **argv)
329{
330 struct stat sb;
331 int rval;
620ab84e 332 const char *f;
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MD
333
334 /*
335 * Remove a file. POSIX 1003.2 states that, by default, attempting
336 * to remove a directory is an error, so must always stat the file.
337 */
338 while ((f = *argv++) != NULL) {
1d2358df
VBD
339 if (info) {
340 info = 0;
341 fprintf(stderr, "Currently removing: %s\n", f);
342 }
343
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MD
344 /* Assume if can't stat the file, can't unlink it. */
345 if (lstat(f, &sb)) {
346 if (Wflag) {
347 sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR;
348 } else {
349 if (!fflag || errno != ENOENT) {
350 warn("%s", f);
351 eval = 1;
352 }
353 continue;
354 }
355 } else if (Wflag) {
356 warnx("%s: %s", f, strerror(EEXIST));
357 eval = 1;
358 continue;
359 }
360
361 if (S_ISDIR(sb.st_mode) && !dflag) {
362 warnx("%s: is a directory", f);
363 eval = 1;
364 continue;
365 }
366 if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb))
367 continue;
368 rval = 0;
369 if (!uid &&
370 (sb.st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
371 !(sb.st_flags & (SF_APPEND|SF_IMMUTABLE)))
372 rval = chflags(f, sb.st_flags & ~(UF_APPEND|UF_IMMUTABLE));
373 if (rval == 0) {
374 if (S_ISWHT(sb.st_mode))
375 rval = undelete(f);
376 else if (S_ISDIR(sb.st_mode))
377 rval = rmdir(f);
378 else {
379 if (Pflag)
e13bfb74
LF
380 if (!rm_overwrite(f, &sb))
381 continue;
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MD
382 rval = unlink(f);
383 }
384 }
385 if (rval && (!fflag || errno != ENOENT)) {
386 warn("%s", f);
387 eval = 1;
388 }
389 if (vflag && rval == 0)
57fed2af 390 printf("%s\n", f);
984263bc
MD
391 }
392}
393
394/*
395 * rm_overwrite --
396 * Overwrite the file 3 times with varying bit patterns.
397 *
398 * XXX
399 * This is a cheap way to *really* delete files. Note that only regular
400 * files are deleted, directories (and therefore names) will remain.
401 * Also, this assumes a fixed-block filesystem (like FFS, or a V7 or a
402 * System V filesystem). In a logging filesystem, you'll have to have
403 * kernel support.
404 */
e13bfb74
LF
405static int
406rm_overwrite(const char *file, struct stat *sbp)
984263bc
MD
407{
408 struct stat sb;
409 struct statfs fsb;
410 off_t len;
411 int bsize, fd, wlen;
412 char *buf = NULL;
413
414 fd = -1;
415 if (sbp == NULL) {
416 if (lstat(file, &sb))
417 goto err;
418 sbp = &sb;
419 }
e13bfb74
LF
420 if (!S_ISREG(sbp->st_mode)) {
421 warnx("%s: cannot overwrite a non-regular file", file);
422 return (1);
423 }
336688f5 424 if (sbp->st_nlink > 1) {
eccf6cca
SW
425 warnx("%s (inode %ju): not overwritten due to multiple links",
426 file, (uintmax_t)sbp->st_ino);
336688f5
MD
427 return (0);
428 }
984263bc
MD
429 if ((fd = open(file, O_WRONLY, 0)) == -1)
430 goto err;
431 if (fstatfs(fd, &fsb) == -1)
432 goto err;
433 bsize = MAX(fsb.f_iosize, 1024);
434 if ((buf = malloc(bsize)) == NULL)
e13bfb74 435 err(1, "%s malloc failed", file);
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MD
436
437#define PASS(byte) { \
438 memset(buf, byte, bsize); \
439 for (len = sbp->st_size; len > 0; len -= wlen) { \
440 wlen = len < bsize ? len : bsize; \
441 if (write(fd, buf, wlen) != wlen) \
442 goto err; \
443 } \
444}
445 PASS(0xff);
446 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
447 goto err;
448 PASS(0x00);
449 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
450 goto err;
451 PASS(0xff);
452 if (!fsync(fd) && !close(fd)) {
453 free(buf);
e13bfb74 454 return (1);
984263bc
MD
455 }
456
457err: eval = 1;
458 if (buf)
459 free(buf);
e13bfb74
LF
460 if (fd != -1)
461 close(fd);
984263bc 462 warn("%s", file);
e13bfb74 463 return (0);
984263bc
MD
464}
465
466
e13bfb74
LF
467static int
468check(const char *path, const char *name, struct stat *sp)
984263bc 469{
799b8cd3
SS
470 static int perm_answer = -1;
471 struct choice {
472 int ch;
473 const char *str;
474 int res;
475 int perm;
476 } *choice, choices[] = {
477 { 'y', "yes" , 1, 0 },
478 { 'n', "no" , 0, 0 },
479 { 'a', "always", 1, 1 },
480 { 'v', "never" , 0, 1 },
481 { 0, NULL, 0, 0 }
482 };
984263bc
MD
483 char modep[15], *flagsp;
484
799b8cd3
SS
485 if (perm_answer != -1)
486 return (perm_answer);
487
984263bc
MD
488 /* Check -i first. */
489 if (iflag)
57fed2af 490 fprintf(stderr, "remove %s? ", path);
984263bc
MD
491 else {
492 /*
493 * If it's not a symbolic link and it's unwritable and we're
494 * talking to a terminal, ask. Symbolic links are excluded
495 * because their permissions are meaningless. Check stdin_ok
496 * first because we may not have stat'ed the file.
e13bfb74 497 * Also skip this check if the -P option was specified because
860c2e6b
SS
498 * we will not be able to overwrite file contents and will
499 * barf later.
984263bc 500 */
e13bfb74 501 if (!stdin_ok || S_ISLNK(sp->st_mode) || Pflag ||
984263bc
MD
502 (!access(name, W_OK) &&
503 !(sp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
504 (!(sp->st_flags & (UF_APPEND|UF_IMMUTABLE)) || !uid)))
505 return (1);
506 strmode(sp->st_mode, modep);
507 if ((flagsp = fflagstostr(sp->st_flags)) == NULL)
508 err(1, NULL);
57fed2af 509 fprintf(stderr, "override %s%s%s/%s %s%sfor %s? ",
984263bc
MD
510 modep + 1, modep[9] == ' ' ? "" : " ",
511 user_from_uid(sp->st_uid, 0),
512 group_from_gid(sp->st_gid, 0),
860c2e6b 513 *flagsp ? flagsp : "", *flagsp ? " " : "",
984263bc
MD
514 path);
515 free(flagsp);
516 }
57fed2af 517 fflush(stderr);
984263bc 518
799b8cd3
SS
519 for (;;) {
520 size_t len;
521 char *answer;
522
523 answer = fgetln(stdin, &len);
524 /* clearerr(stdin); */
525 if (answer == NULL)
526 return (0);
527 if (answer[len - 1] == '\n')
528 len--;
529 if (len == 0)
530 continue;
531
532 for (choice = choices; choice->str != NULL; choice++) {
533 if (len == 1 && choice->ch == answer[0])
534 goto valid_choice;
535 if (strncasecmp(answer, choice->str, len) == 0)
536 goto valid_choice;
537 }
538
539 fprintf(stderr, "invalid answer, try again (y/n/a/v): ");
540 }
541
542valid_choice:
543 if (choice->perm)
544 perm_answer = choice->res;
545 return (choice->res);
984263bc
MD
546}
547
e13bfb74 548static int
28242317
MD
549check2(char **argv)
550{
551 struct stat st;
552 int first;
553 int ch;
554 int fcount = 0;
555 int dcount = 0;
556 int i;
557 const char *dname = NULL;
558
559 for (i = 0; argv[i]; ++i) {
560 if (lstat(argv[i], &st) == 0) {
561 if (S_ISDIR(st.st_mode)) {
562 ++dcount;
563 dname = argv[i]; /* only used if 1 dir */
564 } else {
565 ++fcount;
566 }
567 }
568 }
569 first = 0;
570 while (first != 'n' && first != 'N' && first != 'y' && first != 'Y') {
571 if (dcount && rflag) {
572 fprintf(stderr, "recursively remove");
573 if (dcount == 1)
574 fprintf(stderr, " %s", dname);
575 else
576 fprintf(stderr, " %d dirs", dcount);
577 if (fcount == 1)
578 fprintf(stderr, " and 1 file");
579 else if (fcount > 1)
580 fprintf(stderr, " and %d files", fcount);
581 } else if (dcount + fcount > 3) {
582 fprintf(stderr, "remove %d files", dcount + fcount);
583 } else {
584 return(1);
585 }
586 fprintf(stderr, "? ");
587 fflush(stderr);
588
589 first = ch = getchar();
590 while (ch != '\n' && ch != EOF)
591 ch = getchar();
982099ef
MD
592 if (ch == EOF)
593 break;
28242317
MD
594 }
595 return (first == 'y' || first == 'Y');
596}
597
984263bc 598#define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2])))
e13bfb74 599static void
984263bc
MD
600checkdot(char **argv)
601{
602 char *p, **save, **t;
603 int complained;
604
605 complained = 0;
606 for (t = argv; *t;) {
607 if ((p = strrchr(*t, '/')) != NULL)
608 ++p;
609 else
610 p = *t;
611 if (ISDOT(p)) {
612 if (!complained++)
613 warnx("\".\" and \"..\" may not be removed");
614 eval = 1;
615 for (save = t; (t[0] = t[1]) != NULL; ++t)
616 continue;
617 t = save;
618 } else
619 ++t;
620 }
621}
622
e13bfb74 623static void
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MD
624usage(void)
625{
626
57fed2af 627 fprintf(stderr, "%s\n%s\n",
4d996822 628 "usage: rm [-f | -i] [-dIPRrvW] file ...",
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MD
629 " unlink file");
630 exit(EX_USAGE);
631}
1d2358df
VBD
632
633static void
634siginfo(int notused __unused)
635{
636 info = 1;
637}