Remove not needed void casts.
[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.
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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 $
57fed2af 36 * $DragonFly: src/bin/rm/rm.c,v 1.10 2004/11/07 20:54:51 eirikn 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>
42
43#include <err.h>
44#include <errno.h>
45#include <fcntl.h>
46#include <fts.h>
47#include <stdio.h>
48#include <stdlib.h>
49#include <string.h>
50#include <sysexits.h>
51#include <unistd.h>
52
53int dflag, eval, fflag, iflag, Pflag, vflag, Wflag, stdin_ok;
28242317 54int rflag, Iflag;
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55uid_t uid;
56
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57static int check(const char *, const char *, struct stat *);
58static int check2(char **);
59static void checkdot(char **);
60static void rm_file(char **);
61static int rm_overwrite(const char *, struct stat *);
62static void rm_tree(char **);
63static void usage(void);
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64
65/*
66 * rm --
67 * This rm is different from historic rm's, but is expected to match
68 * POSIX 1003.2 behavior. The most visible difference is that -f
69 * has two specific effects now, ignore non-existent files and force
70 * file removal.
71 */
72int
73main(int argc, char *argv[])
74{
28242317 75 int ch;
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76 char *p;
77
78 /*
79 * Test for the special case where the utility is called as
80 * "unlink", for which the functionality provided is greatly
81 * simplified.
82 */
17b61719 83 if ((p = strrchr(argv[0], '/')) == NULL)
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84 p = argv[0];
85 else
86 ++p;
87 if (strcmp(p, "unlink") == 0) {
88 while (getopt(argc, argv, "") != -1)
89 usage();
90 argc -= optind;
91 argv += optind;
92 if (argc != 1)
93 usage();
94 rm_file(&argv[0]);
95 exit(eval);
96 }
97
98 Pflag = rflag = 0;
28242317 99 while ((ch = getopt(argc, argv, "dfiIPRrvW")) != -1)
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100 switch(ch) {
101 case 'd':
102 dflag = 1;
103 break;
104 case 'f':
105 fflag = 1;
106 iflag = 0;
107 break;
108 case 'i':
109 fflag = 0;
110 iflag = 1;
111 break;
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112 case 'I':
113 Iflag = 1;
114 break;
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115 case 'P':
116 Pflag = 1;
117 break;
118 case 'R':
119 case 'r': /* Compatibility. */
120 rflag = 1;
121 break;
122 case 'v':
123 vflag = 1;
124 break;
125 case 'W':
126 Wflag = 1;
127 break;
128 default:
129 usage();
130 }
131 argc -= optind;
132 argv += optind;
133
134 if (argc < 1) {
135 if (fflag)
136 return 0;
137 usage();
138 }
139
140 checkdot(argv);
141 uid = geteuid();
142
143 if (*argv) {
144 stdin_ok = isatty(STDIN_FILENO);
145
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146 if (Iflag) {
147 if (check2(argv) == 0)
148 exit (1);
149 }
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150 if (rflag)
151 rm_tree(argv);
152 else
153 rm_file(argv);
154 }
155
156 exit (eval);
157}
158
e13bfb74 159static void
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160rm_tree(char **argv)
161{
162 FTS *fts;
163 FTSENT *p;
164 int needstat;
165 int flags;
166 int rval;
167
168 /*
169 * Remove a file hierarchy. If forcing removal (-f), or interactive
170 * (-i) or can't ask anyway (stdin_ok), don't stat the file.
171 */
172 needstat = !uid || (!fflag && !iflag && stdin_ok);
173
174 /*
175 * If the -i option is specified, the user can skip on the pre-order
176 * visit. The fts_number field flags skipped directories.
177 */
178#define SKIPPED 1
179
180 flags = FTS_PHYSICAL;
181 if (!needstat)
182 flags |= FTS_NOSTAT;
183 if (Wflag)
184 flags |= FTS_WHITEOUT;
185 if (!(fts = fts_open(argv, flags, NULL)))
186 err(1, NULL);
187 while ((p = fts_read(fts)) != NULL) {
188 switch (p->fts_info) {
189 case FTS_DNR:
190 if (!fflag || p->fts_errno != ENOENT) {
191 warnx("%s: %s",
192 p->fts_path, strerror(p->fts_errno));
193 eval = 1;
194 }
195 continue;
196 case FTS_ERR:
197 errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno));
198 case FTS_NS:
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199 /*
200 * Assume that since fts_read() couldn't stat
201 * the file, it can't be unlinked.
202 */
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203 if (!needstat)
204 break;
205 if (!fflag || p->fts_errno != ENOENT) {
206 warnx("%s: %s",
207 p->fts_path, strerror(p->fts_errno));
208 eval = 1;
209 }
210 continue;
211 case FTS_D:
212 /* Pre-order: give user chance to skip. */
213 if (!fflag && !check(p->fts_path, p->fts_accpath,
214 p->fts_statp)) {
57fed2af 215 fts_set(fts, p, FTS_SKIP);
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216 p->fts_number = SKIPPED;
217 }
218 else if (!uid &&
219 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
220 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
221 chflags(p->fts_accpath,
222 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)) < 0)
223 goto err;
224 continue;
225 case FTS_DP:
226 /* Post-order: see if user skipped. */
227 if (p->fts_number == SKIPPED)
228 continue;
229 break;
230 default:
231 if (!fflag &&
232 !check(p->fts_path, p->fts_accpath, p->fts_statp))
233 continue;
234 }
235
236 rval = 0;
237 if (!uid &&
238 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
239 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)))
240 rval = chflags(p->fts_accpath,
241 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE));
242 if (rval == 0) {
243 /*
244 * If we can't read or search the directory, may still be
245 * able to remove it. Don't print out the un{read,search}able
246 * message unless the remove fails.
247 */
248 switch (p->fts_info) {
249 case FTS_DP:
250 case FTS_DNR:
251 rval = rmdir(p->fts_accpath);
252 if (rval == 0 || (fflag && errno == ENOENT)) {
253 if (rval == 0 && vflag)
57fed2af 254 printf("%s\n",
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255 p->fts_path);
256 continue;
257 }
258 break;
259
260 case FTS_W:
261 rval = undelete(p->fts_accpath);
262 if (rval == 0 && (fflag && errno == ENOENT)) {
263 if (vflag)
57fed2af 264 printf("%s\n",
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265 p->fts_path);
266 continue;
267 }
268 break;
269
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270 case FTS_NS:
271 /*
272 * Assume that since fts_read() couldn't stat
273 * the file, it can't be unlinked.
274 */
275 if (fflag)
276 continue;
277 /* FALLTHROUGH */
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278 default:
279 if (Pflag)
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280 if (!rm_overwrite(p->fts_accpath, NULL))
281 continue;
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282 rval = unlink(p->fts_accpath);
283 if (rval == 0 || (fflag && errno == ENOENT)) {
284 if (rval == 0 && vflag)
57fed2af 285 printf("%s\n",
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286 p->fts_path);
287 continue;
288 }
289 }
290 }
291err:
292 warn("%s", p->fts_path);
293 eval = 1;
294 }
295 if (errno)
296 err(1, "fts_read");
297}
298
e13bfb74 299static void
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300rm_file(char **argv)
301{
302 struct stat sb;
303 int rval;
304 char *f;
305
306 /*
307 * Remove a file. POSIX 1003.2 states that, by default, attempting
308 * to remove a directory is an error, so must always stat the file.
309 */
310 while ((f = *argv++) != NULL) {
311 /* Assume if can't stat the file, can't unlink it. */
312 if (lstat(f, &sb)) {
313 if (Wflag) {
314 sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR;
315 } else {
316 if (!fflag || errno != ENOENT) {
317 warn("%s", f);
318 eval = 1;
319 }
320 continue;
321 }
322 } else if (Wflag) {
323 warnx("%s: %s", f, strerror(EEXIST));
324 eval = 1;
325 continue;
326 }
327
328 if (S_ISDIR(sb.st_mode) && !dflag) {
329 warnx("%s: is a directory", f);
330 eval = 1;
331 continue;
332 }
333 if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb))
334 continue;
335 rval = 0;
336 if (!uid &&
337 (sb.st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
338 !(sb.st_flags & (SF_APPEND|SF_IMMUTABLE)))
339 rval = chflags(f, sb.st_flags & ~(UF_APPEND|UF_IMMUTABLE));
340 if (rval == 0) {
341 if (S_ISWHT(sb.st_mode))
342 rval = undelete(f);
343 else if (S_ISDIR(sb.st_mode))
344 rval = rmdir(f);
345 else {
346 if (Pflag)
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347 if (!rm_overwrite(f, &sb))
348 continue;
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349 rval = unlink(f);
350 }
351 }
352 if (rval && (!fflag || errno != ENOENT)) {
353 warn("%s", f);
354 eval = 1;
355 }
356 if (vflag && rval == 0)
57fed2af 357 printf("%s\n", f);
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358 }
359}
360
361/*
362 * rm_overwrite --
363 * Overwrite the file 3 times with varying bit patterns.
364 *
365 * XXX
366 * This is a cheap way to *really* delete files. Note that only regular
367 * files are deleted, directories (and therefore names) will remain.
368 * Also, this assumes a fixed-block filesystem (like FFS, or a V7 or a
369 * System V filesystem). In a logging filesystem, you'll have to have
370 * kernel support.
371 */
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372static int
373rm_overwrite(const char *file, struct stat *sbp)
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374{
375 struct stat sb;
376 struct statfs fsb;
377 off_t len;
378 int bsize, fd, wlen;
379 char *buf = NULL;
380
381 fd = -1;
382 if (sbp == NULL) {
383 if (lstat(file, &sb))
384 goto err;
385 sbp = &sb;
386 }
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387 if (!S_ISREG(sbp->st_mode)) {
388 warnx("%s: cannot overwrite a non-regular file", file);
389 return (1);
390 }
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391 if ((fd = open(file, O_WRONLY, 0)) == -1)
392 goto err;
393 if (fstatfs(fd, &fsb) == -1)
394 goto err;
395 bsize = MAX(fsb.f_iosize, 1024);
396 if ((buf = malloc(bsize)) == NULL)
e13bfb74 397 err(1, "%s malloc failed", file);
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398
399#define PASS(byte) { \
400 memset(buf, byte, bsize); \
401 for (len = sbp->st_size; len > 0; len -= wlen) { \
402 wlen = len < bsize ? len : bsize; \
403 if (write(fd, buf, wlen) != wlen) \
404 goto err; \
405 } \
406}
407 PASS(0xff);
408 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
409 goto err;
410 PASS(0x00);
411 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
412 goto err;
413 PASS(0xff);
414 if (!fsync(fd) && !close(fd)) {
415 free(buf);
e13bfb74 416 return (1);
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417 }
418
419err: eval = 1;
420 if (buf)
421 free(buf);
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422 if (fd != -1)
423 close(fd);
984263bc 424 warn("%s", file);
e13bfb74 425 return (0);
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426}
427
428
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429static int
430check(const char *path, const char *name, struct stat *sp)
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431{
432 int ch, first;
433 char modep[15], *flagsp;
434
435 /* Check -i first. */
436 if (iflag)
57fed2af 437 fprintf(stderr, "remove %s? ", path);
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438 else {
439 /*
440 * If it's not a symbolic link and it's unwritable and we're
441 * talking to a terminal, ask. Symbolic links are excluded
442 * because their permissions are meaningless. Check stdin_ok
443 * first because we may not have stat'ed the file.
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444 * Also skip this check if the -P option was specified because
445 * we will not be able to overwrite file contents and will
446 * barf later.
984263bc 447 */
e13bfb74 448 if (!stdin_ok || S_ISLNK(sp->st_mode) || Pflag ||
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449 (!access(name, W_OK) &&
450 !(sp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
451 (!(sp->st_flags & (UF_APPEND|UF_IMMUTABLE)) || !uid)))
452 return (1);
453 strmode(sp->st_mode, modep);
454 if ((flagsp = fflagstostr(sp->st_flags)) == NULL)
455 err(1, NULL);
57fed2af 456 fprintf(stderr, "override %s%s%s/%s %s%sfor %s? ",
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457 modep + 1, modep[9] == ' ' ? "" : " ",
458 user_from_uid(sp->st_uid, 0),
459 group_from_gid(sp->st_gid, 0),
460 *flagsp ? flagsp : "", *flagsp ? " " : "",
461 path);
462 free(flagsp);
463 }
57fed2af 464 fflush(stderr);
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465
466 first = ch = getchar();
467 while (ch != '\n' && ch != EOF)
468 ch = getchar();
469 return (first == 'y' || first == 'Y');
470}
471
e13bfb74 472static int
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473check2(char **argv)
474{
475 struct stat st;
476 int first;
477 int ch;
478 int fcount = 0;
479 int dcount = 0;
480 int i;
481 const char *dname = NULL;
482
483 for (i = 0; argv[i]; ++i) {
484 if (lstat(argv[i], &st) == 0) {
485 if (S_ISDIR(st.st_mode)) {
486 ++dcount;
487 dname = argv[i]; /* only used if 1 dir */
488 } else {
489 ++fcount;
490 }
491 }
492 }
493 first = 0;
494 while (first != 'n' && first != 'N' && first != 'y' && first != 'Y') {
495 if (dcount && rflag) {
496 fprintf(stderr, "recursively remove");
497 if (dcount == 1)
498 fprintf(stderr, " %s", dname);
499 else
500 fprintf(stderr, " %d dirs", dcount);
501 if (fcount == 1)
502 fprintf(stderr, " and 1 file");
503 else if (fcount > 1)
504 fprintf(stderr, " and %d files", fcount);
505 } else if (dcount + fcount > 3) {
506 fprintf(stderr, "remove %d files", dcount + fcount);
507 } else {
508 return(1);
509 }
510 fprintf(stderr, "? ");
511 fflush(stderr);
512
513 first = ch = getchar();
514 while (ch != '\n' && ch != EOF)
515 ch = getchar();
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516 if (ch == EOF)
517 break;
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518 }
519 return (first == 'y' || first == 'Y');
520}
521
984263bc 522#define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2])))
e13bfb74 523static void
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524checkdot(char **argv)
525{
526 char *p, **save, **t;
527 int complained;
528
529 complained = 0;
530 for (t = argv; *t;) {
531 if ((p = strrchr(*t, '/')) != NULL)
532 ++p;
533 else
534 p = *t;
535 if (ISDOT(p)) {
536 if (!complained++)
537 warnx("\".\" and \"..\" may not be removed");
538 eval = 1;
539 for (save = t; (t[0] = t[1]) != NULL; ++t)
540 continue;
541 t = save;
542 } else
543 ++t;
544 }
545}
546
e13bfb74 547static void
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548usage(void)
549{
550
57fed2af 551 fprintf(stderr, "%s\n%s\n",
4d996822 552 "usage: rm [-f | -i] [-dIPRrvW] file ...",
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553 " unlink file");
554 exit(EX_USAGE);
555}