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sdiff udiff text old ( 241014 ) new ( 249948 )
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rm.c (241014) rm.c (249948)
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
32static 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
38static char sccsid[] = "@(#)rm.c 8.5 (Berkeley) 4/18/94";
39#endif /* not lint */
40#endif
41#include <sys/cdefs.h>
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
32static 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
38static char sccsid[] = "@(#)rm.c 8.5 (Berkeley) 4/18/94";
39#endif /* not lint */
40#endif
41#include <sys/cdefs.h>
42__FBSDID("$FreeBSD: head/bin/rm/rm.c 241014 2012-09-27 23:31:12Z mdf $");
42__FBSDID("$FreeBSD: head/bin/rm/rm.c 249948 2013-04-26 17:45:37Z eadler $");
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 <pwd.h>
54#include <stdint.h>
55#include <stdio.h>
56#include <stdlib.h>
57#include <string.h>
58#include <sysexits.h>
59#include <unistd.h>
60
61static int dflag, eval, fflag, iflag, Pflag, vflag, Wflag, stdin_ok;
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 <pwd.h>
54#include <stdint.h>
55#include <stdio.h>
56#include <stdlib.h>
57#include <string.h>
58#include <sysexits.h>
59#include <unistd.h>
60
61static int dflag, eval, fflag, iflag, Pflag, vflag, Wflag, stdin_ok;
62static int rflag, Iflag;
62static int rflag, Iflag, xflag;
63static uid_t uid;
64static volatile sig_atomic_t info;
65
66int check(char *, char *, struct stat *);
67int check2(char **);
68void checkdot(char **);
69void checkslash(char **);
70void rm_file(char **);
71int rm_overwrite(char *, struct stat *);
72void rm_tree(char **);
73static void siginfo(int __unused);
74void usage(void);
75
76/*
77 * rm --
78 * This rm is different from historic rm's, but is expected to match
79 * POSIX 1003.2 behavior. The most visible difference is that -f
80 * has two specific effects now, ignore non-existent files and force
81 * file removal.
82 */
83int
84main(int argc, char *argv[])
85{
86 int ch;
87 char *p;
88
89 /*
90 * Test for the special case where the utility is called as
91 * "unlink", for which the functionality provided is greatly
92 * simplified.
93 */
94 if ((p = strrchr(argv[0], '/')) == NULL)
95 p = argv[0];
96 else
97 ++p;
98 if (strcmp(p, "unlink") == 0) {
99 while (getopt(argc, argv, "") != -1)
100 usage();
101 argc -= optind;
102 argv += optind;
103 if (argc != 1)
104 usage();
105 rm_file(&argv[0]);
106 exit(eval);
107 }
108
63static uid_t uid;
64static volatile sig_atomic_t info;
65
66int check(char *, char *, struct stat *);
67int check2(char **);
68void checkdot(char **);
69void checkslash(char **);
70void rm_file(char **);
71int rm_overwrite(char *, struct stat *);
72void rm_tree(char **);
73static void siginfo(int __unused);
74void usage(void);
75
76/*
77 * rm --
78 * This rm is different from historic rm's, but is expected to match
79 * POSIX 1003.2 behavior. The most visible difference is that -f
80 * has two specific effects now, ignore non-existent files and force
81 * file removal.
82 */
83int
84main(int argc, char *argv[])
85{
86 int ch;
87 char *p;
88
89 /*
90 * Test for the special case where the utility is called as
91 * "unlink", for which the functionality provided is greatly
92 * simplified.
93 */
94 if ((p = strrchr(argv[0], '/')) == NULL)
95 p = argv[0];
96 else
97 ++p;
98 if (strcmp(p, "unlink") == 0) {
99 while (getopt(argc, argv, "") != -1)
100 usage();
101 argc -= optind;
102 argv += optind;
103 if (argc != 1)
104 usage();
105 rm_file(&argv[0]);
106 exit(eval);
107 }
108
109 Pflag = rflag = 0;
110 while ((ch = getopt(argc, argv, "dfiIPRrvW")) != -1)
109 Pflag = 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 Pflag = 1;
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;
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 Pflag = 1;
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;
139 default:
140 usage();
141 }
142 argc -= optind;
143 argv += optind;
144
145 if (argc < 1) {
146 if (fflag)
147 return (0);
148 usage();
149 }
150
151 checkdot(argv);
152 if (getenv("POSIXLY_CORRECT") == NULL)
153 checkslash(argv);
154 uid = geteuid();
155
156 (void)signal(SIGINFO, siginfo);
157 if (*argv) {
158 stdin_ok = isatty(STDIN_FILENO);
159
160 if (Iflag) {
161 if (check2(argv) == 0)
162 exit (1);
163 }
164 if (rflag)
165 rm_tree(argv);
166 else
167 rm_file(argv);
168 }
169
170 exit (eval);
171}
172
173void
174rm_tree(char **argv)
175{
176 FTS *fts;
177 FTSENT *p;
178 int needstat;
179 int flags;
180 int rval;
181
182 /*
183 * Remove a file hierarchy. If forcing removal (-f), or interactive
184 * (-i) or can't ask anyway (stdin_ok), don't stat the file.
185 */
186 needstat = !uid || (!fflag && !iflag && stdin_ok);
187
188 /*
189 * If the -i option is specified, the user can skip on the pre-order
190 * visit. The fts_number field flags skipped directories.
191 */
192#define SKIPPED 1
193
194 flags = FTS_PHYSICAL;
195 if (!needstat)
196 flags |= FTS_NOSTAT;
197 if (Wflag)
198 flags |= FTS_WHITEOUT;
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 if (getenv("POSIXLY_CORRECT") == NULL)
156 checkslash(argv);
157 uid = geteuid();
158
159 (void)signal(SIGINFO, siginfo);
160 if (*argv) {
161 stdin_ok = isatty(STDIN_FILENO);
162
163 if (Iflag) {
164 if (check2(argv) == 0)
165 exit (1);
166 }
167 if (rflag)
168 rm_tree(argv);
169 else
170 rm_file(argv);
171 }
172
173 exit (eval);
174}
175
176void
177rm_tree(char **argv)
178{
179 FTS *fts;
180 FTSENT *p;
181 int needstat;
182 int flags;
183 int rval;
184
185 /*
186 * Remove a file hierarchy. If forcing removal (-f), or interactive
187 * (-i) or can't ask anyway (stdin_ok), don't stat the file.
188 */
189 needstat = !uid || (!fflag && !iflag && stdin_ok);
190
191 /*
192 * If the -i option is specified, the user can skip on the pre-order
193 * visit. The fts_number field flags skipped directories.
194 */
195#define SKIPPED 1
196
197 flags = FTS_PHYSICAL;
198 if (!needstat)
199 flags |= FTS_NOSTAT;
200 if (Wflag)
201 flags |= FTS_WHITEOUT;
202 if (xflag)
203 flags |= FTS_XDEV;
199 if (!(fts = fts_open(argv, flags, NULL))) {
200 if (fflag && errno == ENOENT)
201 return;
202 err(1, "fts_open");
203 }
204 while ((p = fts_read(fts)) != NULL) {
205 switch (p->fts_info) {
206 case FTS_DNR:
207 if (!fflag || p->fts_errno != ENOENT) {
208 warnx("%s: %s",
209 p->fts_path, strerror(p->fts_errno));
210 eval = 1;
211 }
212 continue;
213 case FTS_ERR:
214 errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno));
215 case FTS_NS:
216 /*
217 * Assume that since fts_read() couldn't stat the
218 * file, it can't be unlinked.
219 */
220 if (!needstat)
221 break;
222 if (!fflag || p->fts_errno != ENOENT) {
223 warnx("%s: %s",
224 p->fts_path, strerror(p->fts_errno));
225 eval = 1;
226 }
227 continue;
228 case FTS_D:
229 /* Pre-order: give user chance to skip. */
230 if (!fflag && !check(p->fts_path, p->fts_accpath,
231 p->fts_statp)) {
232 (void)fts_set(fts, p, FTS_SKIP);
233 p->fts_number = SKIPPED;
234 }
235 else if (!uid &&
236 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
237 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
238 lchflags(p->fts_accpath,
239 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)) < 0)
240 goto err;
241 continue;
242 case FTS_DP:
243 /* Post-order: see if user skipped. */
244 if (p->fts_number == SKIPPED)
245 continue;
246 break;
247 default:
248 if (!fflag &&
249 !check(p->fts_path, p->fts_accpath, p->fts_statp))
250 continue;
251 }
252
253 rval = 0;
254 if (!uid &&
255 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
256 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)))
257 rval = lchflags(p->fts_accpath,
258 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE));
259 if (rval == 0) {
260 /*
261 * If we can't read or search the directory, may still be
262 * able to remove it. Don't print out the un{read,search}able
263 * message unless the remove fails.
264 */
265 switch (p->fts_info) {
266 case FTS_DP:
267 case FTS_DNR:
268 rval = rmdir(p->fts_accpath);
269 if (rval == 0 || (fflag && errno == ENOENT)) {
270 if (rval == 0 && vflag)
271 (void)printf("%s\n",
272 p->fts_path);
273 if (rval == 0 && info) {
274 info = 0;
275 (void)printf("%s\n",
276 p->fts_path);
277 }
278 continue;
279 }
280 break;
281
282 case FTS_W:
283 rval = undelete(p->fts_accpath);
284 if (rval == 0 && (fflag && errno == ENOENT)) {
285 if (vflag)
286 (void)printf("%s\n",
287 p->fts_path);
288 if (info) {
289 info = 0;
290 (void)printf("%s\n",
291 p->fts_path);
292 }
293 continue;
294 }
295 break;
296
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 */
305
306 case FTS_F:
307 case FTS_NSOK:
308 if (Pflag)
309 if (!rm_overwrite(p->fts_accpath, p->fts_info ==
310 FTS_NSOK ? NULL : p->fts_statp))
311 continue;
312 /* FALLTHROUGH */
313
314 default:
315 rval = unlink(p->fts_accpath);
316 if (rval == 0 || (fflag && errno == ENOENT)) {
317 if (rval == 0 && vflag)
318 (void)printf("%s\n",
319 p->fts_path);
320 if (rval == 0 && info) {
321 info = 0;
322 (void)printf("%s\n",
323 p->fts_path);
324 }
325 continue;
326 }
327 }
328 }
329err:
330 warn("%s", p->fts_path);
331 eval = 1;
332 }
333 if (errno)
334 err(1, "fts_read");
335 fts_close(fts);
336}
337
338void
339rm_file(char **argv)
340{
341 struct stat sb;
342 int rval;
343 char *f;
344
345 /*
346 * Remove a file. POSIX 1003.2 states that, by default, attempting
347 * to remove a directory is an error, so must always stat the file.
348 */
349 while ((f = *argv++) != NULL) {
350 /* Assume if can't stat the file, can't unlink it. */
351 if (lstat(f, &sb)) {
352 if (Wflag) {
353 sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR;
354 } else {
355 if (!fflag || errno != ENOENT) {
356 warn("%s", f);
357 eval = 1;
358 }
359 continue;
360 }
361 } else if (Wflag) {
362 warnx("%s: %s", f, strerror(EEXIST));
363 eval = 1;
364 continue;
365 }
366
367 if (S_ISDIR(sb.st_mode) && !dflag) {
368 warnx("%s: is a directory", f);
369 eval = 1;
370 continue;
371 }
372 if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb))
373 continue;
374 rval = 0;
375 if (!uid && !S_ISWHT(sb.st_mode) &&
376 (sb.st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
377 !(sb.st_flags & (SF_APPEND|SF_IMMUTABLE)))
378 rval = lchflags(f, sb.st_flags & ~(UF_APPEND|UF_IMMUTABLE));
379 if (rval == 0) {
380 if (S_ISWHT(sb.st_mode))
381 rval = undelete(f);
382 else if (S_ISDIR(sb.st_mode))
383 rval = rmdir(f);
384 else {
385 if (Pflag)
386 if (!rm_overwrite(f, &sb))
387 continue;
388 rval = unlink(f);
389 }
390 }
391 if (rval && (!fflag || errno != ENOENT)) {
392 warn("%s", f);
393 eval = 1;
394 }
395 if (vflag && rval == 0)
396 (void)printf("%s\n", f);
397 if (info && rval == 0) {
398 info = 0;
399 (void)printf("%s\n", f);
400 }
401 }
402}
403
404/*
405 * rm_overwrite --
406 * Overwrite the file 3 times with varying bit patterns.
407 *
408 * XXX
409 * This is a cheap way to *really* delete files. Note that only regular
410 * files are deleted, directories (and therefore names) will remain.
411 * Also, this assumes a fixed-block file system (like FFS, or a V7 or a
412 * System V file system). In a logging or COW file system, you'll have to
413 * have kernel support.
414 */
415int
416rm_overwrite(char *file, struct stat *sbp)
417{
418 struct stat sb, sb2;
419 struct statfs fsb;
420 off_t len;
421 int bsize, fd, wlen;
422 char *buf = NULL;
423
424 fd = -1;
425 if (sbp == NULL) {
426 if (lstat(file, &sb))
427 goto err;
428 sbp = &sb;
429 }
430 if (!S_ISREG(sbp->st_mode))
431 return (1);
432 if (sbp->st_nlink > 1 && !fflag) {
433 warnx("%s (inode %ju): not overwritten due to multiple links",
434 file, (uintmax_t)sbp->st_ino);
435 return (0);
436 }
437 if ((fd = open(file, O_WRONLY|O_NONBLOCK|O_NOFOLLOW, 0)) == -1)
438 goto err;
439 if (fstat(fd, &sb2))
440 goto err;
441 if (sb2.st_dev != sbp->st_dev || sb2.st_ino != sbp->st_ino ||
442 !S_ISREG(sb2.st_mode)) {
443 errno = EPERM;
444 goto err;
445 }
446 if (fstatfs(fd, &fsb) == -1)
447 goto err;
448 bsize = MAX(fsb.f_iosize, 1024);
449 if ((buf = malloc(bsize)) == NULL)
450 err(1, "%s: malloc", file);
451
452#define PASS(byte) { \
453 memset(buf, byte, bsize); \
454 for (len = sbp->st_size; len > 0; len -= wlen) { \
455 wlen = len < bsize ? len : bsize; \
456 if (write(fd, buf, wlen) != wlen) \
457 goto err; \
458 } \
459}
460 PASS(0xff);
461 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
462 goto err;
463 PASS(0x00);
464 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
465 goto err;
466 PASS(0xff);
467 if (!fsync(fd) && !close(fd)) {
468 free(buf);
469 return (1);
470 }
471
472err: eval = 1;
473 if (buf)
474 free(buf);
475 if (fd != -1)
476 close(fd);
477 warn("%s", file);
478 return (0);
479}
480
481
482int
483check(char *path, char *name, struct stat *sp)
484{
485 int ch, first;
486 char modep[15], *flagsp;
487
488 /* Check -i first. */
489 if (iflag)
490 (void)fprintf(stderr, "remove %s? ", path);
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.
497 */
498 if (!stdin_ok || S_ISLNK(sp->st_mode) ||
499 (!access(name, W_OK) &&
500 !(sp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
501 (!(sp->st_flags & (UF_APPEND|UF_IMMUTABLE)) || !uid)))
502 return (1);
503 strmode(sp->st_mode, modep);
504 if ((flagsp = fflagstostr(sp->st_flags)) == NULL)
505 err(1, "fflagstostr");
506 if (Pflag)
507 errx(1,
508 "%s: -P was specified, but file is not writable",
509 path);
510 (void)fprintf(stderr, "override %s%s%s/%s %s%sfor %s? ",
511 modep + 1, modep[9] == ' ' ? "" : " ",
512 user_from_uid(sp->st_uid, 0),
513 group_from_gid(sp->st_gid, 0),
514 *flagsp ? flagsp : "", *flagsp ? " " : "",
515 path);
516 free(flagsp);
517 }
518 (void)fflush(stderr);
519
520 first = ch = getchar();
521 while (ch != '\n' && ch != EOF)
522 ch = getchar();
523 return (first == 'y' || first == 'Y');
524}
525
526#define ISSLASH(a) ((a)[0] == '/' && (a)[1] == '\0')
527void
528checkslash(char **argv)
529{
530 char **t, **u;
531 int complained;
532
533 complained = 0;
534 for (t = argv; *t;) {
535 if (ISSLASH(*t)) {
536 if (!complained++)
537 warnx("\"/\" may not be removed");
538 eval = 1;
539 for (u = t; u[0] != NULL; ++u)
540 u[0] = u[1];
541 } else {
542 ++t;
543 }
544 }
545}
546
547int
548check2(char **argv)
549{
550 struct stat st;
551 int first;
552 int ch;
553 int fcount = 0;
554 int dcount = 0;
555 int i;
556 const char *dname = NULL;
557
558 for (i = 0; argv[i]; ++i) {
559 if (lstat(argv[i], &st) == 0) {
560 if (S_ISDIR(st.st_mode)) {
561 ++dcount;
562 dname = argv[i]; /* only used if 1 dir */
563 } else {
564 ++fcount;
565 }
566 }
567 }
568 first = 0;
569 while (first != 'n' && first != 'N' && first != 'y' && first != 'Y') {
570 if (dcount && rflag) {
571 fprintf(stderr, "recursively remove");
572 if (dcount == 1)
573 fprintf(stderr, " %s", dname);
574 else
575 fprintf(stderr, " %d dirs", dcount);
576 if (fcount == 1)
577 fprintf(stderr, " and 1 file");
578 else if (fcount > 1)
579 fprintf(stderr, " and %d files", fcount);
580 } else if (dcount + fcount > 3) {
581 fprintf(stderr, "remove %d files", dcount + fcount);
582 } else {
583 return(1);
584 }
585 fprintf(stderr, "? ");
586 fflush(stderr);
587
588 first = ch = getchar();
589 while (ch != '\n' && ch != EOF)
590 ch = getchar();
591 if (ch == EOF)
592 break;
593 }
594 return (first == 'y' || first == 'Y');
595}
596
597#define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2])))
598void
599checkdot(char **argv)
600{
601 char *p, **save, **t;
602 int complained;
603
604 complained = 0;
605 for (t = argv; *t;) {
606 if ((p = strrchr(*t, '/')) != NULL)
607 ++p;
608 else
609 p = *t;
610 if (ISDOT(p)) {
611 if (!complained++)
612 warnx("\".\" and \"..\" may not be removed");
613 eval = 1;
614 for (save = t; (t[0] = t[1]) != NULL; ++t)
615 continue;
616 t = save;
617 } else
618 ++t;
619 }
620}
621
622void
623usage(void)
624{
625
626 (void)fprintf(stderr, "%s\n%s\n",
204 if (!(fts = fts_open(argv, flags, NULL))) {
205 if (fflag && errno == ENOENT)
206 return;
207 err(1, "fts_open");
208 }
209 while ((p = fts_read(fts)) != NULL) {
210 switch (p->fts_info) {
211 case FTS_DNR:
212 if (!fflag || p->fts_errno != ENOENT) {
213 warnx("%s: %s",
214 p->fts_path, strerror(p->fts_errno));
215 eval = 1;
216 }
217 continue;
218 case FTS_ERR:
219 errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno));
220 case FTS_NS:
221 /*
222 * Assume that since fts_read() couldn't stat the
223 * file, it can't be unlinked.
224 */
225 if (!needstat)
226 break;
227 if (!fflag || p->fts_errno != ENOENT) {
228 warnx("%s: %s",
229 p->fts_path, strerror(p->fts_errno));
230 eval = 1;
231 }
232 continue;
233 case FTS_D:
234 /* Pre-order: give user chance to skip. */
235 if (!fflag && !check(p->fts_path, p->fts_accpath,
236 p->fts_statp)) {
237 (void)fts_set(fts, p, FTS_SKIP);
238 p->fts_number = SKIPPED;
239 }
240 else if (!uid &&
241 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
242 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
243 lchflags(p->fts_accpath,
244 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)) < 0)
245 goto err;
246 continue;
247 case FTS_DP:
248 /* Post-order: see if user skipped. */
249 if (p->fts_number == SKIPPED)
250 continue;
251 break;
252 default:
253 if (!fflag &&
254 !check(p->fts_path, p->fts_accpath, p->fts_statp))
255 continue;
256 }
257
258 rval = 0;
259 if (!uid &&
260 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
261 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)))
262 rval = lchflags(p->fts_accpath,
263 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE));
264 if (rval == 0) {
265 /*
266 * If we can't read or search the directory, may still be
267 * able to remove it. Don't print out the un{read,search}able
268 * message unless the remove fails.
269 */
270 switch (p->fts_info) {
271 case FTS_DP:
272 case FTS_DNR:
273 rval = rmdir(p->fts_accpath);
274 if (rval == 0 || (fflag && errno == ENOENT)) {
275 if (rval == 0 && vflag)
276 (void)printf("%s\n",
277 p->fts_path);
278 if (rval == 0 && info) {
279 info = 0;
280 (void)printf("%s\n",
281 p->fts_path);
282 }
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)
291 (void)printf("%s\n",
292 p->fts_path);
293 if (info) {
294 info = 0;
295 (void)printf("%s\n",
296 p->fts_path);
297 }
298 continue;
299 }
300 break;
301
302 case FTS_NS:
303 /*
304 * Assume that since fts_read() couldn't stat
305 * the file, it can't be unlinked.
306 */
307 if (fflag)
308 continue;
309 /* FALLTHROUGH */
310
311 case FTS_F:
312 case FTS_NSOK:
313 if (Pflag)
314 if (!rm_overwrite(p->fts_accpath, p->fts_info ==
315 FTS_NSOK ? NULL : p->fts_statp))
316 continue;
317 /* FALLTHROUGH */
318
319 default:
320 rval = unlink(p->fts_accpath);
321 if (rval == 0 || (fflag && errno == ENOENT)) {
322 if (rval == 0 && vflag)
323 (void)printf("%s\n",
324 p->fts_path);
325 if (rval == 0 && info) {
326 info = 0;
327 (void)printf("%s\n",
328 p->fts_path);
329 }
330 continue;
331 }
332 }
333 }
334err:
335 warn("%s", p->fts_path);
336 eval = 1;
337 }
338 if (errno)
339 err(1, "fts_read");
340 fts_close(fts);
341}
342
343void
344rm_file(char **argv)
345{
346 struct stat sb;
347 int rval;
348 char *f;
349
350 /*
351 * Remove a file. POSIX 1003.2 states that, by default, attempting
352 * to remove a directory is an error, so must always stat the file.
353 */
354 while ((f = *argv++) != NULL) {
355 /* Assume if can't stat the file, can't unlink it. */
356 if (lstat(f, &sb)) {
357 if (Wflag) {
358 sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR;
359 } else {
360 if (!fflag || errno != ENOENT) {
361 warn("%s", f);
362 eval = 1;
363 }
364 continue;
365 }
366 } else if (Wflag) {
367 warnx("%s: %s", f, strerror(EEXIST));
368 eval = 1;
369 continue;
370 }
371
372 if (S_ISDIR(sb.st_mode) && !dflag) {
373 warnx("%s: is a directory", f);
374 eval = 1;
375 continue;
376 }
377 if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb))
378 continue;
379 rval = 0;
380 if (!uid && !S_ISWHT(sb.st_mode) &&
381 (sb.st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
382 !(sb.st_flags & (SF_APPEND|SF_IMMUTABLE)))
383 rval = lchflags(f, sb.st_flags & ~(UF_APPEND|UF_IMMUTABLE));
384 if (rval == 0) {
385 if (S_ISWHT(sb.st_mode))
386 rval = undelete(f);
387 else if (S_ISDIR(sb.st_mode))
388 rval = rmdir(f);
389 else {
390 if (Pflag)
391 if (!rm_overwrite(f, &sb))
392 continue;
393 rval = unlink(f);
394 }
395 }
396 if (rval && (!fflag || errno != ENOENT)) {
397 warn("%s", f);
398 eval = 1;
399 }
400 if (vflag && rval == 0)
401 (void)printf("%s\n", f);
402 if (info && rval == 0) {
403 info = 0;
404 (void)printf("%s\n", f);
405 }
406 }
407}
408
409/*
410 * rm_overwrite --
411 * Overwrite the file 3 times with varying bit patterns.
412 *
413 * XXX
414 * This is a cheap way to *really* delete files. Note that only regular
415 * files are deleted, directories (and therefore names) will remain.
416 * Also, this assumes a fixed-block file system (like FFS, or a V7 or a
417 * System V file system). In a logging or COW file system, you'll have to
418 * have kernel support.
419 */
420int
421rm_overwrite(char *file, struct stat *sbp)
422{
423 struct stat sb, sb2;
424 struct statfs fsb;
425 off_t len;
426 int bsize, fd, wlen;
427 char *buf = NULL;
428
429 fd = -1;
430 if (sbp == NULL) {
431 if (lstat(file, &sb))
432 goto err;
433 sbp = &sb;
434 }
435 if (!S_ISREG(sbp->st_mode))
436 return (1);
437 if (sbp->st_nlink > 1 && !fflag) {
438 warnx("%s (inode %ju): not overwritten due to multiple links",
439 file, (uintmax_t)sbp->st_ino);
440 return (0);
441 }
442 if ((fd = open(file, O_WRONLY|O_NONBLOCK|O_NOFOLLOW, 0)) == -1)
443 goto err;
444 if (fstat(fd, &sb2))
445 goto err;
446 if (sb2.st_dev != sbp->st_dev || sb2.st_ino != sbp->st_ino ||
447 !S_ISREG(sb2.st_mode)) {
448 errno = EPERM;
449 goto err;
450 }
451 if (fstatfs(fd, &fsb) == -1)
452 goto err;
453 bsize = MAX(fsb.f_iosize, 1024);
454 if ((buf = malloc(bsize)) == NULL)
455 err(1, "%s: malloc", file);
456
457#define PASS(byte) { \
458 memset(buf, byte, bsize); \
459 for (len = sbp->st_size; len > 0; len -= wlen) { \
460 wlen = len < bsize ? len : bsize; \
461 if (write(fd, buf, wlen) != wlen) \
462 goto err; \
463 } \
464}
465 PASS(0xff);
466 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
467 goto err;
468 PASS(0x00);
469 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
470 goto err;
471 PASS(0xff);
472 if (!fsync(fd) && !close(fd)) {
473 free(buf);
474 return (1);
475 }
476
477err: eval = 1;
478 if (buf)
479 free(buf);
480 if (fd != -1)
481 close(fd);
482 warn("%s", file);
483 return (0);
484}
485
486
487int
488check(char *path, char *name, struct stat *sp)
489{
490 int ch, first;
491 char modep[15], *flagsp;
492
493 /* Check -i first. */
494 if (iflag)
495 (void)fprintf(stderr, "remove %s? ", path);
496 else {
497 /*
498 * If it's not a symbolic link and it's unwritable and we're
499 * talking to a terminal, ask. Symbolic links are excluded
500 * because their permissions are meaningless. Check stdin_ok
501 * first because we may not have stat'ed the file.
502 */
503 if (!stdin_ok || S_ISLNK(sp->st_mode) ||
504 (!access(name, W_OK) &&
505 !(sp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
506 (!(sp->st_flags & (UF_APPEND|UF_IMMUTABLE)) || !uid)))
507 return (1);
508 strmode(sp->st_mode, modep);
509 if ((flagsp = fflagstostr(sp->st_flags)) == NULL)
510 err(1, "fflagstostr");
511 if (Pflag)
512 errx(1,
513 "%s: -P was specified, but file is not writable",
514 path);
515 (void)fprintf(stderr, "override %s%s%s/%s %s%sfor %s? ",
516 modep + 1, modep[9] == ' ' ? "" : " ",
517 user_from_uid(sp->st_uid, 0),
518 group_from_gid(sp->st_gid, 0),
519 *flagsp ? flagsp : "", *flagsp ? " " : "",
520 path);
521 free(flagsp);
522 }
523 (void)fflush(stderr);
524
525 first = ch = getchar();
526 while (ch != '\n' && ch != EOF)
527 ch = getchar();
528 return (first == 'y' || first == 'Y');
529}
530
531#define ISSLASH(a) ((a)[0] == '/' && (a)[1] == '\0')
532void
533checkslash(char **argv)
534{
535 char **t, **u;
536 int complained;
537
538 complained = 0;
539 for (t = argv; *t;) {
540 if (ISSLASH(*t)) {
541 if (!complained++)
542 warnx("\"/\" may not be removed");
543 eval = 1;
544 for (u = t; u[0] != NULL; ++u)
545 u[0] = u[1];
546 } else {
547 ++t;
548 }
549 }
550}
551
552int
553check2(char **argv)
554{
555 struct stat st;
556 int first;
557 int ch;
558 int fcount = 0;
559 int dcount = 0;
560 int i;
561 const char *dname = NULL;
562
563 for (i = 0; argv[i]; ++i) {
564 if (lstat(argv[i], &st) == 0) {
565 if (S_ISDIR(st.st_mode)) {
566 ++dcount;
567 dname = argv[i]; /* only used if 1 dir */
568 } else {
569 ++fcount;
570 }
571 }
572 }
573 first = 0;
574 while (first != 'n' && first != 'N' && first != 'y' && first != 'Y') {
575 if (dcount && rflag) {
576 fprintf(stderr, "recursively remove");
577 if (dcount == 1)
578 fprintf(stderr, " %s", dname);
579 else
580 fprintf(stderr, " %d dirs", dcount);
581 if (fcount == 1)
582 fprintf(stderr, " and 1 file");
583 else if (fcount > 1)
584 fprintf(stderr, " and %d files", fcount);
585 } else if (dcount + fcount > 3) {
586 fprintf(stderr, "remove %d files", dcount + fcount);
587 } else {
588 return(1);
589 }
590 fprintf(stderr, "? ");
591 fflush(stderr);
592
593 first = ch = getchar();
594 while (ch != '\n' && ch != EOF)
595 ch = getchar();
596 if (ch == EOF)
597 break;
598 }
599 return (first == 'y' || first == 'Y');
600}
601
602#define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2])))
603void
604checkdot(char **argv)
605{
606 char *p, **save, **t;
607 int complained;
608
609 complained = 0;
610 for (t = argv; *t;) {
611 if ((p = strrchr(*t, '/')) != NULL)
612 ++p;
613 else
614 p = *t;
615 if (ISDOT(p)) {
616 if (!complained++)
617 warnx("\".\" and \"..\" may not be removed");
618 eval = 1;
619 for (save = t; (t[0] = t[1]) != NULL; ++t)
620 continue;
621 t = save;
622 } else
623 ++t;
624 }
625}
626
627void
628usage(void)
629{
630
631 (void)fprintf(stderr, "%s\n%s\n",
627 "usage: rm [-f | -i] [-dIPRrvW] file ...",
632 "usage: rm [-f | -i] [-dIPRrvWx] file ...",
628 " unlink file");
629 exit(EX_USAGE);
630}
631
632static void
633siginfo(int sig __unused)
634{
635
636 info = 1;
637}
633 " unlink file");
634 exit(EX_USAGE);
635}
636
637static void
638siginfo(int sig __unused)
639{
640
641 info = 1;
642}