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.
32 */
33
| 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.
32 */
33
|
47
48#include <sys/stat.h>
49#include <sys/param.h>
50#include <sys/mount.h>
51
52#include <err.h>
53#include <errno.h>
54#include <fcntl.h>
55#include <fts.h>
56#include <grp.h>
57#include <pwd.h>
58#include <stdio.h>
59#include <stdlib.h>
60#include <string.h>
61#include <sysexits.h>
62#include <unistd.h>
63
64int dflag, eval, fflag, iflag, Pflag, vflag, Wflag, stdin_ok;
65uid_t uid;
66
67int check(char *, char *, struct stat *);
68void checkdot(char **);
69void rm_file(char **);
70void rm_overwrite(char *, struct stat *);
71void rm_tree(char **);
72void usage(void);
73
74/*
75 * rm --
76 * This rm is different from historic rm's, but is expected to match
77 * POSIX 1003.2 behavior. The most visible difference is that -f
78 * has two specific effects now, ignore non-existent files and force
79 * file removal.
80 */
81int
82main(int argc, char *argv[])
83{
84 int ch, rflag;
85 char *p;
86
87 /*
88 * Test for the special case where the utility is called as
89 * "unlink", for which the functionality provided is greatly
90 * simplified.
91 */
92 if ((p = rindex(argv[0], '/')) == NULL)
93 p = argv[0];
94 else
95 ++p;
96 if (strcmp(p, "unlink") == 0) {
97 while (getopt(argc, argv, "") != -1)
98 usage();
99 argc -= optind;
100 argv += optind;
101 if (argc != 1)
102 usage();
103 rm_file(&argv[0]);
104 exit(eval);
105 }
106
107 Pflag = rflag = 0;
108 while ((ch = getopt(argc, argv, "dfiPRrvW")) != -1)
109 switch(ch) {
110 case 'd':
111 dflag = 1;
112 break;
113 case 'f':
114 fflag = 1;
115 iflag = 0;
116 break;
117 case 'i':
118 fflag = 0;
119 iflag = 1;
120 break;
121 case 'P':
122 Pflag = 1;
123 break;
124 case 'R':
125 case 'r': /* Compatibility. */
126 rflag = 1;
127 break;
128 case 'v':
129 vflag = 1;
130 break;
131 case 'W':
132 Wflag = 1;
133 break;
134 default:
135 usage();
136 }
137 argc -= optind;
138 argv += optind;
139
140 if (argc < 1) {
141 if (fflag)
142 return 0;
143 usage();
144 }
145
146 checkdot(argv);
147 uid = geteuid();
148
149 if (*argv) {
150 stdin_ok = isatty(STDIN_FILENO);
151
152 if (rflag)
153 rm_tree(argv);
154 else
155 rm_file(argv);
156 }
157
158 exit (eval);
159}
160
161void
162rm_tree(char **argv)
163{
164 FTS *fts;
165 FTSENT *p;
166 int needstat;
167 int flags;
168 int rval;
169
170 /*
171 * Remove a file hierarchy. If forcing removal (-f), or interactive
172 * (-i) or can't ask anyway (stdin_ok), don't stat the file.
173 */
174 needstat = !uid || (!fflag && !iflag && stdin_ok);
175
176 /*
177 * If the -i option is specified, the user can skip on the pre-order
178 * visit. The fts_number field flags skipped directories.
179 */
180#define SKIPPED 1
181
182 flags = FTS_PHYSICAL;
183 if (!needstat)
184 flags |= FTS_NOSTAT;
185 if (Wflag)
186 flags |= FTS_WHITEOUT;
187 if (!(fts = fts_open(argv, flags, NULL)))
188 err(1, "fts_open");
189 while ((p = fts_read(fts)) != NULL) {
190 switch (p->fts_info) {
191 case FTS_DNR:
192 if (!fflag || p->fts_errno != ENOENT) {
193 warnx("%s: %s",
194 p->fts_path, strerror(p->fts_errno));
195 eval = 1;
196 }
197 continue;
198 case FTS_ERR:
199 errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno));
200 case FTS_NS:
201 /*
202 * FTS_NS: assume that if can't stat the file, it
203 * can't be unlinked.
204 */
205 if (!needstat)
206 break;
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_D:
214 /* Pre-order: give user chance to skip. */
215 if (!fflag && !check(p->fts_path, p->fts_accpath,
216 p->fts_statp)) {
217 (void)fts_set(fts, p, FTS_SKIP);
218 p->fts_number = SKIPPED;
219 }
220 else if (!uid &&
221 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
222 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
223 chflags(p->fts_accpath,
224 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)) < 0)
225 goto err;
226 continue;
227 case FTS_DP:
228 /* Post-order: see if user skipped. */
229 if (p->fts_number == SKIPPED)
230 continue;
231 break;
232 default:
233 if (!fflag &&
234 !check(p->fts_path, p->fts_accpath, p->fts_statp))
235 continue;
236 }
237
238 rval = 0;
239 if (!uid &&
240 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
241 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)))
242 rval = chflags(p->fts_accpath,
243 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE));
244 if (rval == 0) {
245 /*
246 * If we can't read or search the directory, may still be
247 * able to remove it. Don't print out the un{read,search}able
248 * message unless the remove fails.
249 */
250 switch (p->fts_info) {
251 case FTS_DP:
252 case FTS_DNR:
253 rval = rmdir(p->fts_accpath);
254 if (rval == 0 || (fflag && errno == ENOENT)) {
255 if (rval == 0 && vflag)
256 (void)printf("%s\n",
257 p->fts_path);
258 continue;
259 }
260 break;
261
262 case FTS_W:
263 rval = undelete(p->fts_accpath);
264 if (rval == 0 && (fflag && errno == ENOENT)) {
265 if (vflag)
266 (void)printf("%s\n",
267 p->fts_path);
268 continue;
269 }
270 break;
271
272 default:
273 if (Pflag)
274 rm_overwrite(p->fts_accpath, NULL);
275 rval = unlink(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 continue;
281 }
282 }
283 }
284err:
285 warn("%s", p->fts_path);
286 eval = 1;
287 }
288 if (errno)
289 err(1, "fts_read");
290}
291
292void
293rm_file(char **argv)
294{
295 struct stat sb;
296 int rval;
297 char *f;
298
299 /*
300 * Remove a file. POSIX 1003.2 states that, by default, attempting
301 * to remove a directory is an error, so must always stat the file.
302 */
303 while ((f = *argv++) != NULL) {
304 /* Assume if can't stat the file, can't unlink it. */
305 if (lstat(f, &sb)) {
306 if (Wflag) {
307 sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR;
308 } else {
309 if (!fflag || errno != ENOENT) {
310 warn("%s", f);
311 eval = 1;
312 }
313 continue;
314 }
315 } else if (Wflag) {
316 warnx("%s: %s", f, strerror(EEXIST));
317 eval = 1;
318 continue;
319 }
320
321 if (S_ISDIR(sb.st_mode) && !dflag) {
322 warnx("%s: is a directory", f);
323 eval = 1;
324 continue;
325 }
326 if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb))
327 continue;
328 rval = 0;
329 if (!uid &&
330 (sb.st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
331 !(sb.st_flags & (SF_APPEND|SF_IMMUTABLE)))
332 rval = chflags(f, sb.st_flags & ~(UF_APPEND|UF_IMMUTABLE));
333 if (rval == 0) {
334 if (S_ISWHT(sb.st_mode))
335 rval = undelete(f);
336 else if (S_ISDIR(sb.st_mode))
337 rval = rmdir(f);
338 else {
339 if (Pflag)
340 rm_overwrite(f, &sb);
341 rval = unlink(f);
342 }
343 }
344 if (rval && (!fflag || errno != ENOENT)) {
345 warn("%s", f);
346 eval = 1;
347 }
348 if (vflag && rval == 0)
349 (void)printf("%s\n", f);
350 }
351}
352
353/*
354 * rm_overwrite --
355 * Overwrite the file 3 times with varying bit patterns.
356 *
357 * XXX
358 * This is a cheap way to *really* delete files. Note that only regular
359 * files are deleted, directories (and therefore names) will remain.
360 * Also, this assumes a fixed-block file system (like FFS, or a V7 or a
361 * System V file system). In a logging file system, you'll have to have
362 * kernel support.
363 */
364void
365rm_overwrite(char *file, struct stat *sbp)
366{
367 struct stat sb;
368 struct statfs fsb;
369 off_t len;
370 int bsize, fd, wlen;
371 char *buf = NULL;
372
373 fd = -1;
374 if (sbp == NULL) {
375 if (lstat(file, &sb))
376 goto err;
377 sbp = &sb;
378 }
379 if (!S_ISREG(sbp->st_mode))
380 return;
381 if ((fd = open(file, O_WRONLY, 0)) == -1)
382 goto err;
383 if (fstatfs(fd, &fsb) == -1)
384 goto err;
385 bsize = MAX(fsb.f_iosize, 1024);
386 if ((buf = malloc(bsize)) == NULL)
387 err(1, "malloc");
388
389#define PASS(byte) { \
390 memset(buf, byte, bsize); \
391 for (len = sbp->st_size; len > 0; len -= wlen) { \
392 wlen = len < bsize ? len : bsize; \
393 if (write(fd, buf, wlen) != wlen) \
394 goto err; \
395 } \
396}
397 PASS(0xff);
398 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
399 goto err;
400 PASS(0x00);
401 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
402 goto err;
403 PASS(0xff);
404 if (!fsync(fd) && !close(fd)) {
405 free(buf);
406 return;
407 }
408
409err: eval = 1;
410 if (buf)
411 free(buf);
412 warn("%s", file);
413}
414
415
416int
417check(char *path, char *name, struct stat *sp)
418{
419 int ch, first;
420 char modep[15], *flagsp;
421
422 /* Check -i first. */
423 if (iflag)
424 (void)fprintf(stderr, "remove %s? ", path);
425 else {
426 /*
427 * If it's not a symbolic link and it's unwritable and we're
428 * talking to a terminal, ask. Symbolic links are excluded
429 * because their permissions are meaningless. Check stdin_ok
430 * first because we may not have stat'ed the file.
431 */
432 if (!stdin_ok || S_ISLNK(sp->st_mode) ||
433 (!access(name, W_OK) &&
434 !(sp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
435 (!(sp->st_flags & (UF_APPEND|UF_IMMUTABLE)) || !uid)))
436 return (1);
437 strmode(sp->st_mode, modep);
438 if ((flagsp = fflagstostr(sp->st_flags)) == NULL)
439 err(1, "fflagstostr");
440 (void)fprintf(stderr, "override %s%s%s/%s %s%sfor %s? ",
441 modep + 1, modep[9] == ' ' ? "" : " ",
442 user_from_uid(sp->st_uid, 0),
443 group_from_gid(sp->st_gid, 0),
444 *flagsp ? flagsp : "", *flagsp ? " " : "",
445 path);
446 free(flagsp);
447 }
448 (void)fflush(stderr);
449
450 first = ch = getchar();
451 while (ch != '\n' && ch != EOF)
452 ch = getchar();
453 return (first == 'y' || first == 'Y');
454}
455
456#define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2])))
457void
458checkdot(char **argv)
459{
460 char *p, **save, **t;
461 int complained;
462
463 complained = 0;
464 for (t = argv; *t;) {
465 if ((p = strrchr(*t, '/')) != NULL)
466 ++p;
467 else
468 p = *t;
469 if (ISDOT(p)) {
470 if (!complained++)
471 warnx("\".\" and \"..\" may not be removed");
472 eval = 1;
473 for (save = t; (t[0] = t[1]) != NULL; ++t)
474 continue;
475 t = save;
476 } else
477 ++t;
478 }
479}
480
481void
482usage(void)
483{
484
485 (void)fprintf(stderr, "%s\n%s\n",
486 "usage: rm [-f | -i] [-dPRrvW] file ...",
487 " unlink file");
488 exit(EX_USAGE);
489}
| 47
48#include <sys/stat.h>
49#include <sys/param.h>
50#include <sys/mount.h>
51
52#include <err.h>
53#include <errno.h>
54#include <fcntl.h>
55#include <fts.h>
56#include <grp.h>
57#include <pwd.h>
58#include <stdio.h>
59#include <stdlib.h>
60#include <string.h>
61#include <sysexits.h>
62#include <unistd.h>
63
64int dflag, eval, fflag, iflag, Pflag, vflag, Wflag, stdin_ok;
65uid_t uid;
66
67int check(char *, char *, struct stat *);
68void checkdot(char **);
69void rm_file(char **);
70void rm_overwrite(char *, struct stat *);
71void rm_tree(char **);
72void usage(void);
73
74/*
75 * rm --
76 * This rm is different from historic rm's, but is expected to match
77 * POSIX 1003.2 behavior. The most visible difference is that -f
78 * has two specific effects now, ignore non-existent files and force
79 * file removal.
80 */
81int
82main(int argc, char *argv[])
83{
84 int ch, rflag;
85 char *p;
86
87 /*
88 * Test for the special case where the utility is called as
89 * "unlink", for which the functionality provided is greatly
90 * simplified.
91 */
92 if ((p = rindex(argv[0], '/')) == NULL)
93 p = argv[0];
94 else
95 ++p;
96 if (strcmp(p, "unlink") == 0) {
97 while (getopt(argc, argv, "") != -1)
98 usage();
99 argc -= optind;
100 argv += optind;
101 if (argc != 1)
102 usage();
103 rm_file(&argv[0]);
104 exit(eval);
105 }
106
107 Pflag = rflag = 0;
108 while ((ch = getopt(argc, argv, "dfiPRrvW")) != -1)
109 switch(ch) {
110 case 'd':
111 dflag = 1;
112 break;
113 case 'f':
114 fflag = 1;
115 iflag = 0;
116 break;
117 case 'i':
118 fflag = 0;
119 iflag = 1;
120 break;
121 case 'P':
122 Pflag = 1;
123 break;
124 case 'R':
125 case 'r': /* Compatibility. */
126 rflag = 1;
127 break;
128 case 'v':
129 vflag = 1;
130 break;
131 case 'W':
132 Wflag = 1;
133 break;
134 default:
135 usage();
136 }
137 argc -= optind;
138 argv += optind;
139
140 if (argc < 1) {
141 if (fflag)
142 return 0;
143 usage();
144 }
145
146 checkdot(argv);
147 uid = geteuid();
148
149 if (*argv) {
150 stdin_ok = isatty(STDIN_FILENO);
151
152 if (rflag)
153 rm_tree(argv);
154 else
155 rm_file(argv);
156 }
157
158 exit (eval);
159}
160
161void
162rm_tree(char **argv)
163{
164 FTS *fts;
165 FTSENT *p;
166 int needstat;
167 int flags;
168 int rval;
169
170 /*
171 * Remove a file hierarchy. If forcing removal (-f), or interactive
172 * (-i) or can't ask anyway (stdin_ok), don't stat the file.
173 */
174 needstat = !uid || (!fflag && !iflag && stdin_ok);
175
176 /*
177 * If the -i option is specified, the user can skip on the pre-order
178 * visit. The fts_number field flags skipped directories.
179 */
180#define SKIPPED 1
181
182 flags = FTS_PHYSICAL;
183 if (!needstat)
184 flags |= FTS_NOSTAT;
185 if (Wflag)
186 flags |= FTS_WHITEOUT;
187 if (!(fts = fts_open(argv, flags, NULL)))
188 err(1, "fts_open");
189 while ((p = fts_read(fts)) != NULL) {
190 switch (p->fts_info) {
191 case FTS_DNR:
192 if (!fflag || p->fts_errno != ENOENT) {
193 warnx("%s: %s",
194 p->fts_path, strerror(p->fts_errno));
195 eval = 1;
196 }
197 continue;
198 case FTS_ERR:
199 errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno));
200 case FTS_NS:
201 /*
202 * FTS_NS: assume that if can't stat the file, it
203 * can't be unlinked.
204 */
205 if (!needstat)
206 break;
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_D:
214 /* Pre-order: give user chance to skip. */
215 if (!fflag && !check(p->fts_path, p->fts_accpath,
216 p->fts_statp)) {
217 (void)fts_set(fts, p, FTS_SKIP);
218 p->fts_number = SKIPPED;
219 }
220 else if (!uid &&
221 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
222 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
223 chflags(p->fts_accpath,
224 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)) < 0)
225 goto err;
226 continue;
227 case FTS_DP:
228 /* Post-order: see if user skipped. */
229 if (p->fts_number == SKIPPED)
230 continue;
231 break;
232 default:
233 if (!fflag &&
234 !check(p->fts_path, p->fts_accpath, p->fts_statp))
235 continue;
236 }
237
238 rval = 0;
239 if (!uid &&
240 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
241 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)))
242 rval = chflags(p->fts_accpath,
243 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE));
244 if (rval == 0) {
245 /*
246 * If we can't read or search the directory, may still be
247 * able to remove it. Don't print out the un{read,search}able
248 * message unless the remove fails.
249 */
250 switch (p->fts_info) {
251 case FTS_DP:
252 case FTS_DNR:
253 rval = rmdir(p->fts_accpath);
254 if (rval == 0 || (fflag && errno == ENOENT)) {
255 if (rval == 0 && vflag)
256 (void)printf("%s\n",
257 p->fts_path);
258 continue;
259 }
260 break;
261
262 case FTS_W:
263 rval = undelete(p->fts_accpath);
264 if (rval == 0 && (fflag && errno == ENOENT)) {
265 if (vflag)
266 (void)printf("%s\n",
267 p->fts_path);
268 continue;
269 }
270 break;
271
272 default:
273 if (Pflag)
274 rm_overwrite(p->fts_accpath, NULL);
275 rval = unlink(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 continue;
281 }
282 }
283 }
284err:
285 warn("%s", p->fts_path);
286 eval = 1;
287 }
288 if (errno)
289 err(1, "fts_read");
290}
291
292void
293rm_file(char **argv)
294{
295 struct stat sb;
296 int rval;
297 char *f;
298
299 /*
300 * Remove a file. POSIX 1003.2 states that, by default, attempting
301 * to remove a directory is an error, so must always stat the file.
302 */
303 while ((f = *argv++) != NULL) {
304 /* Assume if can't stat the file, can't unlink it. */
305 if (lstat(f, &sb)) {
306 if (Wflag) {
307 sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR;
308 } else {
309 if (!fflag || errno != ENOENT) {
310 warn("%s", f);
311 eval = 1;
312 }
313 continue;
314 }
315 } else if (Wflag) {
316 warnx("%s: %s", f, strerror(EEXIST));
317 eval = 1;
318 continue;
319 }
320
321 if (S_ISDIR(sb.st_mode) && !dflag) {
322 warnx("%s: is a directory", f);
323 eval = 1;
324 continue;
325 }
326 if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb))
327 continue;
328 rval = 0;
329 if (!uid &&
330 (sb.st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
331 !(sb.st_flags & (SF_APPEND|SF_IMMUTABLE)))
332 rval = chflags(f, sb.st_flags & ~(UF_APPEND|UF_IMMUTABLE));
333 if (rval == 0) {
334 if (S_ISWHT(sb.st_mode))
335 rval = undelete(f);
336 else if (S_ISDIR(sb.st_mode))
337 rval = rmdir(f);
338 else {
339 if (Pflag)
340 rm_overwrite(f, &sb);
341 rval = unlink(f);
342 }
343 }
344 if (rval && (!fflag || errno != ENOENT)) {
345 warn("%s", f);
346 eval = 1;
347 }
348 if (vflag && rval == 0)
349 (void)printf("%s\n", f);
350 }
351}
352
353/*
354 * rm_overwrite --
355 * Overwrite the file 3 times with varying bit patterns.
356 *
357 * XXX
358 * This is a cheap way to *really* delete files. Note that only regular
359 * files are deleted, directories (and therefore names) will remain.
360 * Also, this assumes a fixed-block file system (like FFS, or a V7 or a
361 * System V file system). In a logging file system, you'll have to have
362 * kernel support.
363 */
364void
365rm_overwrite(char *file, struct stat *sbp)
366{
367 struct stat sb;
368 struct statfs fsb;
369 off_t len;
370 int bsize, fd, wlen;
371 char *buf = NULL;
372
373 fd = -1;
374 if (sbp == NULL) {
375 if (lstat(file, &sb))
376 goto err;
377 sbp = &sb;
378 }
379 if (!S_ISREG(sbp->st_mode))
380 return;
381 if ((fd = open(file, O_WRONLY, 0)) == -1)
382 goto err;
383 if (fstatfs(fd, &fsb) == -1)
384 goto err;
385 bsize = MAX(fsb.f_iosize, 1024);
386 if ((buf = malloc(bsize)) == NULL)
387 err(1, "malloc");
388
389#define PASS(byte) { \
390 memset(buf, byte, bsize); \
391 for (len = sbp->st_size; len > 0; len -= wlen) { \
392 wlen = len < bsize ? len : bsize; \
393 if (write(fd, buf, wlen) != wlen) \
394 goto err; \
395 } \
396}
397 PASS(0xff);
398 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
399 goto err;
400 PASS(0x00);
401 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
402 goto err;
403 PASS(0xff);
404 if (!fsync(fd) && !close(fd)) {
405 free(buf);
406 return;
407 }
408
409err: eval = 1;
410 if (buf)
411 free(buf);
412 warn("%s", file);
413}
414
415
416int
417check(char *path, char *name, struct stat *sp)
418{
419 int ch, first;
420 char modep[15], *flagsp;
421
422 /* Check -i first. */
423 if (iflag)
424 (void)fprintf(stderr, "remove %s? ", path);
425 else {
426 /*
427 * If it's not a symbolic link and it's unwritable and we're
428 * talking to a terminal, ask. Symbolic links are excluded
429 * because their permissions are meaningless. Check stdin_ok
430 * first because we may not have stat'ed the file.
431 */
432 if (!stdin_ok || S_ISLNK(sp->st_mode) ||
433 (!access(name, W_OK) &&
434 !(sp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
435 (!(sp->st_flags & (UF_APPEND|UF_IMMUTABLE)) || !uid)))
436 return (1);
437 strmode(sp->st_mode, modep);
438 if ((flagsp = fflagstostr(sp->st_flags)) == NULL)
439 err(1, "fflagstostr");
440 (void)fprintf(stderr, "override %s%s%s/%s %s%sfor %s? ",
441 modep + 1, modep[9] == ' ' ? "" : " ",
442 user_from_uid(sp->st_uid, 0),
443 group_from_gid(sp->st_gid, 0),
444 *flagsp ? flagsp : "", *flagsp ? " " : "",
445 path);
446 free(flagsp);
447 }
448 (void)fflush(stderr);
449
450 first = ch = getchar();
451 while (ch != '\n' && ch != EOF)
452 ch = getchar();
453 return (first == 'y' || first == 'Y');
454}
455
456#define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2])))
457void
458checkdot(char **argv)
459{
460 char *p, **save, **t;
461 int complained;
462
463 complained = 0;
464 for (t = argv; *t;) {
465 if ((p = strrchr(*t, '/')) != NULL)
466 ++p;
467 else
468 p = *t;
469 if (ISDOT(p)) {
470 if (!complained++)
471 warnx("\".\" and \"..\" may not be removed");
472 eval = 1;
473 for (save = t; (t[0] = t[1]) != NULL; ++t)
474 continue;
475 t = save;
476 } else
477 ++t;
478 }
479}
480
481void
482usage(void)
483{
484
485 (void)fprintf(stderr, "%s\n%s\n",
486 "usage: rm [-f | -i] [-dPRrvW] file ...",
487 " unlink file");
488 exit(EX_USAGE);
489}
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