Add support for SIGINFO.
[dragonfly.git] / bin / rm / rm.c
CommitLineData
984263bc
MD
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 $
1d2358df 36 * $DragonFly: src/bin/rm/rm.c,v 1.18 2006/11/11 12:11:25 victor Exp $
984263bc
MD
37 */
38
984263bc
MD
39#include <sys/stat.h>
40#include <sys/param.h>
41#include <sys/mount.h>
68c91344 42#include <sys/ioctl.h>
984263bc
MD
43
44#include <err.h>
45#include <errno.h>
46#include <fcntl.h>
47#include <fts.h>
1d2358df 48#include <signal.h>
984263bc
MD
49#include <stdio.h>
50#include <stdlib.h>
51#include <string.h>
52#include <sysexits.h>
53#include <unistd.h>
54
1d2358df
VBD
55static int dflag, eval, fflag, iflag, Pflag, vflag, Wflag, stdin_ok;
56static int rflag, Iflag;
57static uid_t uid;
58volatile sig_atomic_t info;
984263bc 59
e13bfb74
LF
60static int check(const char *, const char *, struct stat *);
61static int check2(char **);
62static void checkdot(char **);
63static void rm_file(char **);
64static int rm_overwrite(const char *, struct stat *);
65static void rm_tree(char **);
1d2358df 66static void siginfo(int);
e13bfb74 67static void usage(void);
984263bc
MD
68
69/*
70 * rm --
71 * This rm is different from historic rm's, but is expected to match
72 * POSIX 1003.2 behavior. The most visible difference is that -f
73 * has two specific effects now, ignore non-existent files and force
74 * file removal.
75 */
76int
77main(int argc, char *argv[])
78{
28242317 79 int ch;
620ab84e 80 const char *p;
68c91344 81 pid_t tty_pgrp;
984263bc
MD
82
83 /*
84 * Test for the special case where the utility is called as
85 * "unlink", for which the functionality provided is greatly
86 * simplified.
87 */
17b61719 88 if ((p = strrchr(argv[0], '/')) == NULL)
984263bc
MD
89 p = argv[0];
90 else
91 ++p;
92 if (strcmp(p, "unlink") == 0) {
93 while (getopt(argc, argv, "") != -1)
94 usage();
95 argc -= optind;
96 argv += optind;
97 if (argc != 1)
98 usage();
99 rm_file(&argv[0]);
100 exit(eval);
101 }
102
103 Pflag = rflag = 0;
64a3a712 104 while ((ch = getopt(argc, argv, "dfiIPRrvW")) != -1) {
984263bc
MD
105 switch(ch) {
106 case 'd':
107 dflag = 1;
108 break;
109 case 'f':
110 fflag = 1;
111 iflag = 0;
112 break;
113 case 'i':
114 fflag = 0;
115 iflag = 1;
116 break;
28242317 117 case 'I':
68c91344
MD
118 /*
119 * The -I flag is intended to be generally aliasable
120 * in /etc/csh.cshrc. We apply it only to foreground
121 * processes.
122 */
123 if (ioctl(0, TIOCGPGRP, &tty_pgrp) == 0) {
124 if (tty_pgrp == getpgrp())
125 Iflag = 1;
126 }
28242317 127 break;
984263bc
MD
128 case 'P':
129 Pflag = 1;
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 default:
142 usage();
143 }
64a3a712 144 }
984263bc
MD
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 uid = geteuid();
1d2358df
VBD
156
157 signal(SIGINFO, siginfo);
984263bc
MD
158
159 if (*argv) {
160 stdin_ok = isatty(STDIN_FILENO);
161
64a3a712 162 if (Iflag && !iflag) {
28242317
MD
163 if (check2(argv) == 0)
164 exit (1);
165 }
984263bc
MD
166 if (rflag)
167 rm_tree(argv);
168 else
169 rm_file(argv);
170 }
171
172 exit (eval);
173}
174
e13bfb74 175static void
984263bc
MD
176rm_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;
620ab84e
LF
201 if ((fts = fts_open(argv, flags, NULL)) == NULL) {
202 if (fflag && errno == ENOENT)
203 return;
984263bc 204 err(1, NULL);
620ab84e 205 }
984263bc
MD
206 while ((p = fts_read(fts)) != NULL) {
207 switch (p->fts_info) {
208 case FTS_DNR:
209 if (!fflag || p->fts_errno != ENOENT) {
210 warnx("%s: %s",
211 p->fts_path, strerror(p->fts_errno));
212 eval = 1;
213 }
214 continue;
215 case FTS_ERR:
216 errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno));
217 case FTS_NS:
e13bfb74
LF
218 /*
219 * Assume that since fts_read() couldn't stat
220 * the file, it can't be unlinked.
221 */
984263bc
MD
222 if (!needstat)
223 break;
224 if (!fflag || p->fts_errno != ENOENT) {
225 warnx("%s: %s",
226 p->fts_path, strerror(p->fts_errno));
227 eval = 1;
228 }
229 continue;
230 case FTS_D:
231 /* Pre-order: give user chance to skip. */
232 if (!fflag && !check(p->fts_path, p->fts_accpath,
233 p->fts_statp)) {
57fed2af 234 fts_set(fts, p, FTS_SKIP);
984263bc
MD
235 p->fts_number = SKIPPED;
236 }
237 else if (!uid &&
238 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
239 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
240 chflags(p->fts_accpath,
241 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)) < 0)
242 goto err;
243 continue;
244 case FTS_DP:
245 /* Post-order: see if user skipped. */
246 if (p->fts_number == SKIPPED)
247 continue;
248 break;
249 default:
250 if (!fflag &&
251 !check(p->fts_path, p->fts_accpath, p->fts_statp))
252 continue;
253 }
254
1d2358df
VBD
255 if (info) {
256 info = 0;
257 fprintf(stderr, "Currently removing: %s\n", p->fts_path);
258 }
259
984263bc
MD
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 = chflags(p->fts_accpath,
265 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE));
1d2358df 266
984263bc
MD
267 if (rval == 0) {
268 /*
269 * If we can't read or search the directory, may still be
270 * able to remove it. Don't print out the un{read,search}able
271 * message unless the remove fails.
272 */
273 switch (p->fts_info) {
274 case FTS_DP:
275 case FTS_DNR:
276 rval = rmdir(p->fts_accpath);
277 if (rval == 0 || (fflag && errno == ENOENT)) {
278 if (rval == 0 && vflag)
57fed2af 279 printf("%s\n",
984263bc
MD
280 p->fts_path);
281 continue;
282 }
283 break;
284
285 case FTS_W:
286 rval = undelete(p->fts_accpath);
287 if (rval == 0 && (fflag && errno == ENOENT)) {
288 if (vflag)
57fed2af 289 printf("%s\n",
984263bc
MD
290 p->fts_path);
291 continue;
292 }
293 break;
294
e13bfb74
LF
295 case FTS_NS:
296 /*
297 * Assume that since fts_read() couldn't stat
298 * the file, it can't be unlinked.
299 */
300 if (fflag)
301 continue;
302 /* FALLTHROUGH */
984263bc
MD
303 default:
304 if (Pflag)
e13bfb74
LF
305 if (!rm_overwrite(p->fts_accpath, NULL))
306 continue;
984263bc
MD
307 rval = unlink(p->fts_accpath);
308 if (rval == 0 || (fflag && errno == ENOENT)) {
309 if (rval == 0 && vflag)
57fed2af 310 printf("%s\n",
984263bc
MD
311 p->fts_path);
312 continue;
313 }
314 }
315 }
316err:
317 warn("%s", p->fts_path);
318 eval = 1;
319 }
320 if (errno)
321 err(1, "fts_read");
356438f3 322 fts_close(fts);
984263bc
MD
323}
324
e13bfb74 325static void
984263bc
MD
326rm_file(char **argv)
327{
328 struct stat sb;
329 int rval;
620ab84e 330 const char *f;
984263bc
MD
331
332 /*
333 * Remove a file. POSIX 1003.2 states that, by default, attempting
334 * to remove a directory is an error, so must always stat the file.
335 */
336 while ((f = *argv++) != NULL) {
1d2358df
VBD
337 if (info) {
338 info = 0;
339 fprintf(stderr, "Currently removing: %s\n", f);
340 }
341
984263bc
MD
342 /* Assume if can't stat the file, can't unlink it. */
343 if (lstat(f, &sb)) {
344 if (Wflag) {
345 sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR;
346 } else {
347 if (!fflag || errno != ENOENT) {
348 warn("%s", f);
349 eval = 1;
350 }
351 continue;
352 }
353 } else if (Wflag) {
354 warnx("%s: %s", f, strerror(EEXIST));
355 eval = 1;
356 continue;
357 }
358
359 if (S_ISDIR(sb.st_mode) && !dflag) {
360 warnx("%s: is a directory", f);
361 eval = 1;
362 continue;
363 }
364 if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb))
365 continue;
366 rval = 0;
367 if (!uid &&
368 (sb.st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
369 !(sb.st_flags & (SF_APPEND|SF_IMMUTABLE)))
370 rval = chflags(f, sb.st_flags & ~(UF_APPEND|UF_IMMUTABLE));
371 if (rval == 0) {
372 if (S_ISWHT(sb.st_mode))
373 rval = undelete(f);
374 else if (S_ISDIR(sb.st_mode))
375 rval = rmdir(f);
376 else {
377 if (Pflag)
e13bfb74
LF
378 if (!rm_overwrite(f, &sb))
379 continue;
984263bc
MD
380 rval = unlink(f);
381 }
382 }
383 if (rval && (!fflag || errno != ENOENT)) {
384 warn("%s", f);
385 eval = 1;
386 }
387 if (vflag && rval == 0)
57fed2af 388 printf("%s\n", f);
984263bc
MD
389 }
390}
391
392/*
393 * rm_overwrite --
394 * Overwrite the file 3 times with varying bit patterns.
395 *
396 * XXX
397 * This is a cheap way to *really* delete files. Note that only regular
398 * files are deleted, directories (and therefore names) will remain.
399 * Also, this assumes a fixed-block filesystem (like FFS, or a V7 or a
400 * System V filesystem). In a logging filesystem, you'll have to have
401 * kernel support.
402 */
e13bfb74
LF
403static int
404rm_overwrite(const char *file, struct stat *sbp)
984263bc
MD
405{
406 struct stat sb;
407 struct statfs fsb;
408 off_t len;
409 int bsize, fd, wlen;
410 char *buf = NULL;
411
412 fd = -1;
413 if (sbp == NULL) {
414 if (lstat(file, &sb))
415 goto err;
416 sbp = &sb;
417 }
e13bfb74
LF
418 if (!S_ISREG(sbp->st_mode)) {
419 warnx("%s: cannot overwrite a non-regular file", file);
420 return (1);
421 }
336688f5
MD
422 if (sbp->st_nlink > 1) {
423 warnx("%s (inode %u): not overwritten due to multiple links",
424 file, sbp->st_ino);
425 return (0);
426 }
984263bc
MD
427 if ((fd = open(file, O_WRONLY, 0)) == -1)
428 goto err;
429 if (fstatfs(fd, &fsb) == -1)
430 goto err;
431 bsize = MAX(fsb.f_iosize, 1024);
432 if ((buf = malloc(bsize)) == NULL)
e13bfb74 433 err(1, "%s malloc failed", file);
984263bc
MD
434
435#define PASS(byte) { \
436 memset(buf, byte, bsize); \
437 for (len = sbp->st_size; len > 0; len -= wlen) { \
438 wlen = len < bsize ? len : bsize; \
439 if (write(fd, buf, wlen) != wlen) \
440 goto err; \
441 } \
442}
443 PASS(0xff);
444 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
445 goto err;
446 PASS(0x00);
447 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
448 goto err;
449 PASS(0xff);
450 if (!fsync(fd) && !close(fd)) {
451 free(buf);
e13bfb74 452 return (1);
984263bc
MD
453 }
454
455err: eval = 1;
456 if (buf)
457 free(buf);
e13bfb74
LF
458 if (fd != -1)
459 close(fd);
984263bc 460 warn("%s", file);
e13bfb74 461 return (0);
984263bc
MD
462}
463
464
e13bfb74
LF
465static int
466check(const char *path, const char *name, struct stat *sp)
984263bc 467{
799b8cd3
SS
468 static int perm_answer = -1;
469 struct choice {
470 int ch;
471 const char *str;
472 int res;
473 int perm;
474 } *choice, choices[] = {
475 { 'y', "yes" , 1, 0 },
476 { 'n', "no" , 0, 0 },
477 { 'a', "always", 1, 1 },
478 { 'v', "never" , 0, 1 },
479 { 0, NULL, 0, 0 }
480 };
984263bc
MD
481 char modep[15], *flagsp;
482
799b8cd3
SS
483 if (perm_answer != -1)
484 return (perm_answer);
485
984263bc
MD
486 /* Check -i first. */
487 if (iflag)
57fed2af 488 fprintf(stderr, "remove %s? ", path);
984263bc
MD
489 else {
490 /*
491 * If it's not a symbolic link and it's unwritable and we're
492 * talking to a terminal, ask. Symbolic links are excluded
493 * because their permissions are meaningless. Check stdin_ok
494 * first because we may not have stat'ed the file.
e13bfb74 495 * Also skip this check if the -P option was specified because
860c2e6b
SS
496 * we will not be able to overwrite file contents and will
497 * barf later.
984263bc 498 */
e13bfb74 499 if (!stdin_ok || S_ISLNK(sp->st_mode) || Pflag ||
984263bc
MD
500 (!access(name, W_OK) &&
501 !(sp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
502 (!(sp->st_flags & (UF_APPEND|UF_IMMUTABLE)) || !uid)))
503 return (1);
504 strmode(sp->st_mode, modep);
505 if ((flagsp = fflagstostr(sp->st_flags)) == NULL)
506 err(1, NULL);
57fed2af 507 fprintf(stderr, "override %s%s%s/%s %s%sfor %s? ",
984263bc
MD
508 modep + 1, modep[9] == ' ' ? "" : " ",
509 user_from_uid(sp->st_uid, 0),
510 group_from_gid(sp->st_gid, 0),
860c2e6b 511 *flagsp ? flagsp : "", *flagsp ? " " : "",
984263bc
MD
512 path);
513 free(flagsp);
514 }
57fed2af 515 fflush(stderr);
984263bc 516
799b8cd3
SS
517 for (;;) {
518 size_t len;
519 char *answer;
520
521 answer = fgetln(stdin, &len);
522 /* clearerr(stdin); */
523 if (answer == NULL)
524 return (0);
525 if (answer[len - 1] == '\n')
526 len--;
527 if (len == 0)
528 continue;
529
530 for (choice = choices; choice->str != NULL; choice++) {
531 if (len == 1 && choice->ch == answer[0])
532 goto valid_choice;
533 if (strncasecmp(answer, choice->str, len) == 0)
534 goto valid_choice;
535 }
536
537 fprintf(stderr, "invalid answer, try again (y/n/a/v): ");
538 }
539
540valid_choice:
541 if (choice->perm)
542 perm_answer = choice->res;
543 return (choice->res);
984263bc
MD
544}
545
e13bfb74 546static int
28242317
MD
547check2(char **argv)
548{
549 struct stat st;
550 int first;
551 int ch;
552 int fcount = 0;
553 int dcount = 0;
554 int i;
555 const char *dname = NULL;
556
557 for (i = 0; argv[i]; ++i) {
558 if (lstat(argv[i], &st) == 0) {
559 if (S_ISDIR(st.st_mode)) {
560 ++dcount;
561 dname = argv[i]; /* only used if 1 dir */
562 } else {
563 ++fcount;
564 }
565 }
566 }
567 first = 0;
568 while (first != 'n' && first != 'N' && first != 'y' && first != 'Y') {
569 if (dcount && rflag) {
570 fprintf(stderr, "recursively remove");
571 if (dcount == 1)
572 fprintf(stderr, " %s", dname);
573 else
574 fprintf(stderr, " %d dirs", dcount);
575 if (fcount == 1)
576 fprintf(stderr, " and 1 file");
577 else if (fcount > 1)
578 fprintf(stderr, " and %d files", fcount);
579 } else if (dcount + fcount > 3) {
580 fprintf(stderr, "remove %d files", dcount + fcount);
581 } else {
582 return(1);
583 }
584 fprintf(stderr, "? ");
585 fflush(stderr);
586
587 first = ch = getchar();
588 while (ch != '\n' && ch != EOF)
589 ch = getchar();
982099ef
MD
590 if (ch == EOF)
591 break;
28242317
MD
592 }
593 return (first == 'y' || first == 'Y');
594}
595
984263bc 596#define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2])))
e13bfb74 597static void
984263bc
MD
598checkdot(char **argv)
599{
600 char *p, **save, **t;
601 int complained;
602
603 complained = 0;
604 for (t = argv; *t;) {
605 if ((p = strrchr(*t, '/')) != NULL)
606 ++p;
607 else
608 p = *t;
609 if (ISDOT(p)) {
610 if (!complained++)
611 warnx("\".\" and \"..\" may not be removed");
612 eval = 1;
613 for (save = t; (t[0] = t[1]) != NULL; ++t)
614 continue;
615 t = save;
616 } else
617 ++t;
618 }
619}
620
e13bfb74 621static void
984263bc
MD
622usage(void)
623{
624
57fed2af 625 fprintf(stderr, "%s\n%s\n",
4d996822 626 "usage: rm [-f | -i] [-dIPRrvW] file ...",
984263bc
MD
627 " unlink file");
628 exit(EX_USAGE);
629}
1d2358df
VBD
630
631static void
632siginfo(int notused __unused)
633{
634 info = 1;
635}