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
34#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1990, 1993, 1994\n\
37 The Regents of the University of California. All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41#if 0
42static char sccsid[] = "@(#)rm.c 8.5 (Berkeley) 4/18/94";
43#else
44static const char rcsid[] =
| 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
34#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1990, 1993, 1994\n\
37 The Regents of the University of California. All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41#if 0
42static char sccsid[] = "@(#)rm.c 8.5 (Berkeley) 4/18/94";
43#else
44static const char rcsid[] =
|
57#include <stdio.h>
58#include <stdlib.h>
59#include <string.h>
60#include <sysexits.h>
61#include <unistd.h>
62
63int dflag, eval, fflag, iflag, Pflag, vflag, Wflag, stdin_ok;
64uid_t uid;
65
66int check(char *, char *, struct stat *);
67void checkdot(char **);
68void rm_file(char **);
69void rm_overwrite(char *, struct stat *);
70void rm_tree(char **);
71void usage(void);
72
73/*
74 * rm --
75 * This rm is different from historic rm's, but is expected to match
76 * POSIX 1003.2 behavior. The most visible difference is that -f
77 * has two specific effects now, ignore non-existent files and force
78 * file removal.
79 */
80int
81main(int argc, char *argv[])
82{
83 int ch, rflag;
84 char *p;
85
86 /*
87 * Test for the special case where the utility is called as
88 * "unlink", for which the functionality provided is greatly
89 * simplified.
90 */
91 if ((p = rindex(argv[0], '/')) == NULL)
92 p = argv[0];
93 else
94 ++p;
95 if (strcmp(p, "unlink") == 0) {
96 if (argc == 2) {
97 rm_file(&argv[1]);
98 exit(eval);
99 } else
100 usage();
101 }
102
103 Pflag = rflag = 0;
104 while ((ch = getopt(argc, argv, "dfiPRrvW")) != -1)
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;
117 case 'P':
118 Pflag = 1;
119 break;
120 case 'R':
121 case 'r': /* Compatibility. */
122 rflag = 1;
123 break;
124 case 'v':
125 vflag = 1;
126 break;
127 case 'W':
128 Wflag = 1;
129 break;
130 default:
131 usage();
132 }
133 argc -= optind;
134 argv += optind;
135
136 if (argc < 1) {
137 if (fflag)
138 return 0;
139 usage();
140 }
141
142 checkdot(argv);
143 uid = geteuid();
144
145 if (*argv) {
146 stdin_ok = isatty(STDIN_FILENO);
147
148 if (rflag)
149 rm_tree(argv);
150 else
151 rm_file(argv);
152 }
153
154 exit (eval);
155}
156
157void
158rm_tree(char **argv)
159{
160 FTS *fts;
161 FTSENT *p;
162 int needstat;
163 int flags;
164 int rval;
165
166 /*
167 * Remove a file hierarchy. If forcing removal (-f), or interactive
168 * (-i) or can't ask anyway (stdin_ok), don't stat the file.
169 */
170 needstat = !uid || (!fflag && !iflag && stdin_ok);
171
172 /*
173 * If the -i option is specified, the user can skip on the pre-order
174 * visit. The fts_number field flags skipped directories.
175 */
176#define SKIPPED 1
177
178 flags = FTS_PHYSICAL;
179 if (!needstat)
180 flags |= FTS_NOSTAT;
181 if (Wflag)
182 flags |= FTS_WHITEOUT;
183 if (!(fts = fts_open(argv, flags, NULL)))
184 err(1, NULL);
185 while ((p = fts_read(fts)) != NULL) {
186 switch (p->fts_info) {
187 case FTS_DNR:
188 if (!fflag || p->fts_errno != ENOENT) {
189 warnx("%s: %s",
190 p->fts_path, strerror(p->fts_errno));
191 eval = 1;
192 }
193 continue;
194 case FTS_ERR:
195 errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno));
196 case FTS_NS:
197 /*
198 * FTS_NS: assume that if can't stat the file, it
199 * can't be unlinked.
200 */
201 if (!needstat)
202 break;
203 if (!fflag || p->fts_errno != ENOENT) {
204 warnx("%s: %s",
205 p->fts_path, strerror(p->fts_errno));
206 eval = 1;
207 }
208 continue;
209 case FTS_D:
210 /* Pre-order: give user chance to skip. */
211 if (!fflag && !check(p->fts_path, p->fts_accpath,
212 p->fts_statp)) {
213 (void)fts_set(fts, p, FTS_SKIP);
214 p->fts_number = SKIPPED;
215 }
216 else if (!uid &&
217 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
218 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
219 chflags(p->fts_accpath,
220 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)) < 0)
221 goto err;
222 continue;
223 case FTS_DP:
224 /* Post-order: see if user skipped. */
225 if (p->fts_number == SKIPPED)
226 continue;
227 break;
228 default:
229 if (!fflag &&
230 !check(p->fts_path, p->fts_accpath, p->fts_statp))
231 continue;
232 }
233
234 rval = 0;
235 if (!uid &&
236 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
237 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)))
238 rval = chflags(p->fts_accpath,
239 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE));
240 if (rval == 0) {
241 /*
242 * If we can't read or search the directory, may still be
243 * able to remove it. Don't print out the un{read,search}able
244 * message unless the remove fails.
245 */
246 switch (p->fts_info) {
247 case FTS_DP:
248 case FTS_DNR:
249 rval = rmdir(p->fts_accpath);
250 if (rval == 0 || (fflag && errno == ENOENT)) {
251 if (rval == 0 && vflag)
252 (void)printf("%s\n",
253 p->fts_path);
254 continue;
255 }
256 break;
257
258 case FTS_W:
259 rval = undelete(p->fts_accpath);
260 if (rval == 0 && (fflag && errno == ENOENT)) {
261 if (vflag)
262 (void)printf("%s\n",
263 p->fts_path);
264 continue;
265 }
266 break;
267
268 default:
269 if (Pflag)
270 rm_overwrite(p->fts_accpath, NULL);
271 rval = unlink(p->fts_accpath);
272 if (rval == 0 || (fflag && errno == ENOENT)) {
273 if (rval == 0 && vflag)
274 (void)printf("%s\n",
275 p->fts_path);
276 continue;
277 }
278 }
279 }
280err:
281 warn("%s", p->fts_path);
282 eval = 1;
283 }
284 if (errno)
285 err(1, "fts_read");
286}
287
288void
289rm_file(char **argv)
290{
291 struct stat sb;
292 int rval;
293 char *f;
294
295 /*
296 * Remove a file. POSIX 1003.2 states that, by default, attempting
297 * to remove a directory is an error, so must always stat the file.
298 */
299 while ((f = *argv++) != NULL) {
300 /* Assume if can't stat the file, can't unlink it. */
301 if (lstat(f, &sb)) {
302 if (Wflag) {
303 sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR;
304 } else {
305 if (!fflag || errno != ENOENT) {
306 warn("%s", f);
307 eval = 1;
308 }
309 continue;
310 }
311 } else if (Wflag) {
312 warnx("%s: %s", f, strerror(EEXIST));
313 eval = 1;
314 continue;
315 }
316
317 if (S_ISDIR(sb.st_mode) && !dflag) {
318 warnx("%s: is a directory", f);
319 eval = 1;
320 continue;
321 }
322 if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb))
323 continue;
324 rval = 0;
325 if (!uid &&
326 (sb.st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
327 !(sb.st_flags & (SF_APPEND|SF_IMMUTABLE)))
328 rval = chflags(f, sb.st_flags & ~(UF_APPEND|UF_IMMUTABLE));
329 if (rval == 0) {
330 if (S_ISWHT(sb.st_mode))
331 rval = undelete(f);
332 else if (S_ISDIR(sb.st_mode))
333 rval = rmdir(f);
334 else {
335 if (Pflag)
336 rm_overwrite(f, &sb);
337 rval = unlink(f);
338 }
339 }
340 if (rval && (!fflag || errno != ENOENT)) {
341 warn("%s", f);
342 eval = 1;
343 }
344 if (vflag && rval == 0)
345 (void)printf("%s\n", f);
346 }
347}
348
349/*
350 * rm_overwrite --
351 * Overwrite the file 3 times with varying bit patterns.
352 *
353 * XXX
354 * This is a cheap way to *really* delete files. Note that only regular
355 * files are deleted, directories (and therefore names) will remain.
356 * Also, this assumes a fixed-block file system (like FFS, or a V7 or a
357 * System V file system). In a logging file system, you'll have to have
358 * kernel support.
359 */
360void
361rm_overwrite(char *file, struct stat *sbp)
362{
363 struct stat sb;
364 struct statfs fsb;
365 off_t len;
366 int bsize, fd, wlen;
367 char *buf = NULL;
368
369 fd = -1;
370 if (sbp == NULL) {
371 if (lstat(file, &sb))
372 goto err;
373 sbp = &sb;
374 }
375 if (!S_ISREG(sbp->st_mode))
376 return;
377 if ((fd = open(file, O_WRONLY, 0)) == -1)
378 goto err;
379 if (fstatfs(fd, &fsb) == -1)
380 goto err;
381 bsize = MAX(fsb.f_iosize, 1024);
382 if ((buf = malloc(bsize)) == NULL)
383 err(1, "malloc");
384
385#define PASS(byte) { \
386 memset(buf, byte, bsize); \
387 for (len = sbp->st_size; len > 0; len -= wlen) { \
388 wlen = len < bsize ? len : bsize; \
389 if (write(fd, buf, wlen) != wlen) \
390 goto err; \
391 } \
392}
393 PASS(0xff);
394 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
395 goto err;
396 PASS(0x00);
397 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
398 goto err;
399 PASS(0xff);
400 if (!fsync(fd) && !close(fd)) {
401 free(buf);
402 return;
403 }
404
405err: eval = 1;
406 if (buf)
407 free(buf);
408 warn("%s", file);
409}
410
411
412int
413check(char *path, char *name, struct stat *sp)
414{
415 int ch, first;
416 char modep[15], *flagsp;
417
418 /* Check -i first. */
419 if (iflag)
420 (void)fprintf(stderr, "remove %s? ", path);
421 else {
422 /*
423 * If it's not a symbolic link and it's unwritable and we're
424 * talking to a terminal, ask. Symbolic links are excluded
425 * because their permissions are meaningless. Check stdin_ok
426 * first because we may not have stat'ed the file.
427 */
428 if (!stdin_ok || S_ISLNK(sp->st_mode) ||
429 (!access(name, W_OK) &&
430 !(sp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
431 (!(sp->st_flags & (UF_APPEND|UF_IMMUTABLE)) || !uid)))
432 return (1);
433 strmode(sp->st_mode, modep);
434 if ((flagsp = fflagstostr(sp->st_flags)) == NULL)
435 err(1, NULL);
436 (void)fprintf(stderr, "override %s%s%s/%s %s%sfor %s? ",
437 modep + 1, modep[9] == ' ' ? "" : " ",
438 user_from_uid(sp->st_uid, 0),
439 group_from_gid(sp->st_gid, 0),
440 *flagsp ? flagsp : "", *flagsp ? " " : "",
441 path);
442 free(flagsp);
443 }
444 (void)fflush(stderr);
445
446 first = ch = getchar();
447 while (ch != '\n' && ch != EOF)
448 ch = getchar();
449 return (first == 'y' || first == 'Y');
450}
451
452#define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2])))
453void
454checkdot(char **argv)
455{
456 char *p, **save, **t;
457 int complained;
458
459 complained = 0;
460 for (t = argv; *t;) {
461 if ((p = strrchr(*t, '/')) != NULL)
462 ++p;
463 else
464 p = *t;
465 if (ISDOT(p)) {
466 if (!complained++)
467 warnx("\".\" and \"..\" may not be removed");
468 eval = 1;
469 for (save = t; (t[0] = t[1]) != NULL; ++t)
470 continue;
471 t = save;
472 } else
473 ++t;
474 }
475}
476
477void
478usage(void)
479{
480
481 (void)fprintf(stderr, "%s\n%s\n",
482 "usage: rm [-f | -i] [-dPRrvW] file ...",
483 " unlink file");
484 exit(EX_USAGE);
485}
| 59#include <stdio.h>
60#include <stdlib.h>
61#include <string.h>
62#include <sysexits.h>
63#include <unistd.h>
64
65int dflag, eval, fflag, iflag, Pflag, vflag, Wflag, stdin_ok;
66uid_t uid;
67
68int check(char *, char *, struct stat *);
69void checkdot(char **);
70void rm_file(char **);
71void rm_overwrite(char *, struct stat *);
72void rm_tree(char **);
73void usage(void);
74
75/*
76 * rm --
77 * This rm is different from historic rm's, but is expected to match
78 * POSIX 1003.2 behavior. The most visible difference is that -f
79 * has two specific effects now, ignore non-existent files and force
80 * file removal.
81 */
82int
83main(int argc, char *argv[])
84{
85 int ch, rflag;
86 char *p;
87
88 /*
89 * Test for the special case where the utility is called as
90 * "unlink", for which the functionality provided is greatly
91 * simplified.
92 */
93 if ((p = rindex(argv[0], '/')) == NULL)
94 p = argv[0];
95 else
96 ++p;
97 if (strcmp(p, "unlink") == 0) {
98 if (argc == 2) {
99 rm_file(&argv[1]);
100 exit(eval);
101 } else
102 usage();
103 }
104
105 Pflag = rflag = 0;
106 while ((ch = getopt(argc, argv, "dfiPRrvW")) != -1)
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;
119 case 'P':
120 Pflag = 1;
121 break;
122 case 'R':
123 case 'r': /* Compatibility. */
124 rflag = 1;
125 break;
126 case 'v':
127 vflag = 1;
128 break;
129 case 'W':
130 Wflag = 1;
131 break;
132 default:
133 usage();
134 }
135 argc -= optind;
136 argv += optind;
137
138 if (argc < 1) {
139 if (fflag)
140 return 0;
141 usage();
142 }
143
144 checkdot(argv);
145 uid = geteuid();
146
147 if (*argv) {
148 stdin_ok = isatty(STDIN_FILENO);
149
150 if (rflag)
151 rm_tree(argv);
152 else
153 rm_file(argv);
154 }
155
156 exit (eval);
157}
158
159void
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:
199 /*
200 * FTS_NS: assume that if can't stat the file, it
201 * can't be unlinked.
202 */
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)) {
215 (void)fts_set(fts, p, FTS_SKIP);
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)
254 (void)printf("%s\n",
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)
264 (void)printf("%s\n",
265 p->fts_path);
266 continue;
267 }
268 break;
269
270 default:
271 if (Pflag)
272 rm_overwrite(p->fts_accpath, NULL);
273 rval = unlink(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 continue;
279 }
280 }
281 }
282err:
283 warn("%s", p->fts_path);
284 eval = 1;
285 }
286 if (errno)
287 err(1, "fts_read");
288}
289
290void
291rm_file(char **argv)
292{
293 struct stat sb;
294 int rval;
295 char *f;
296
297 /*
298 * Remove a file. POSIX 1003.2 states that, by default, attempting
299 * to remove a directory is an error, so must always stat the file.
300 */
301 while ((f = *argv++) != NULL) {
302 /* Assume if can't stat the file, can't unlink it. */
303 if (lstat(f, &sb)) {
304 if (Wflag) {
305 sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR;
306 } else {
307 if (!fflag || errno != ENOENT) {
308 warn("%s", f);
309 eval = 1;
310 }
311 continue;
312 }
313 } else if (Wflag) {
314 warnx("%s: %s", f, strerror(EEXIST));
315 eval = 1;
316 continue;
317 }
318
319 if (S_ISDIR(sb.st_mode) && !dflag) {
320 warnx("%s: is a directory", f);
321 eval = 1;
322 continue;
323 }
324 if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb))
325 continue;
326 rval = 0;
327 if (!uid &&
328 (sb.st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
329 !(sb.st_flags & (SF_APPEND|SF_IMMUTABLE)))
330 rval = chflags(f, sb.st_flags & ~(UF_APPEND|UF_IMMUTABLE));
331 if (rval == 0) {
332 if (S_ISWHT(sb.st_mode))
333 rval = undelete(f);
334 else if (S_ISDIR(sb.st_mode))
335 rval = rmdir(f);
336 else {
337 if (Pflag)
338 rm_overwrite(f, &sb);
339 rval = unlink(f);
340 }
341 }
342 if (rval && (!fflag || errno != ENOENT)) {
343 warn("%s", f);
344 eval = 1;
345 }
346 if (vflag && rval == 0)
347 (void)printf("%s\n", f);
348 }
349}
350
351/*
352 * rm_overwrite --
353 * Overwrite the file 3 times with varying bit patterns.
354 *
355 * XXX
356 * This is a cheap way to *really* delete files. Note that only regular
357 * files are deleted, directories (and therefore names) will remain.
358 * Also, this assumes a fixed-block file system (like FFS, or a V7 or a
359 * System V file system). In a logging file system, you'll have to have
360 * kernel support.
361 */
362void
363rm_overwrite(char *file, struct stat *sbp)
364{
365 struct stat sb;
366 struct statfs fsb;
367 off_t len;
368 int bsize, fd, wlen;
369 char *buf = NULL;
370
371 fd = -1;
372 if (sbp == NULL) {
373 if (lstat(file, &sb))
374 goto err;
375 sbp = &sb;
376 }
377 if (!S_ISREG(sbp->st_mode))
378 return;
379 if ((fd = open(file, O_WRONLY, 0)) == -1)
380 goto err;
381 if (fstatfs(fd, &fsb) == -1)
382 goto err;
383 bsize = MAX(fsb.f_iosize, 1024);
384 if ((buf = malloc(bsize)) == NULL)
385 err(1, "malloc");
386
387#define PASS(byte) { \
388 memset(buf, byte, bsize); \
389 for (len = sbp->st_size; len > 0; len -= wlen) { \
390 wlen = len < bsize ? len : bsize; \
391 if (write(fd, buf, wlen) != wlen) \
392 goto err; \
393 } \
394}
395 PASS(0xff);
396 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
397 goto err;
398 PASS(0x00);
399 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
400 goto err;
401 PASS(0xff);
402 if (!fsync(fd) && !close(fd)) {
403 free(buf);
404 return;
405 }
406
407err: eval = 1;
408 if (buf)
409 free(buf);
410 warn("%s", file);
411}
412
413
414int
415check(char *path, char *name, struct stat *sp)
416{
417 int ch, first;
418 char modep[15], *flagsp;
419
420 /* Check -i first. */
421 if (iflag)
422 (void)fprintf(stderr, "remove %s? ", path);
423 else {
424 /*
425 * If it's not a symbolic link and it's unwritable and we're
426 * talking to a terminal, ask. Symbolic links are excluded
427 * because their permissions are meaningless. Check stdin_ok
428 * first because we may not have stat'ed the file.
429 */
430 if (!stdin_ok || S_ISLNK(sp->st_mode) ||
431 (!access(name, W_OK) &&
432 !(sp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
433 (!(sp->st_flags & (UF_APPEND|UF_IMMUTABLE)) || !uid)))
434 return (1);
435 strmode(sp->st_mode, modep);
436 if ((flagsp = fflagstostr(sp->st_flags)) == NULL)
437 err(1, NULL);
438 (void)fprintf(stderr, "override %s%s%s/%s %s%sfor %s? ",
439 modep + 1, modep[9] == ' ' ? "" : " ",
440 user_from_uid(sp->st_uid, 0),
441 group_from_gid(sp->st_gid, 0),
442 *flagsp ? flagsp : "", *flagsp ? " " : "",
443 path);
444 free(flagsp);
445 }
446 (void)fflush(stderr);
447
448 first = ch = getchar();
449 while (ch != '\n' && ch != EOF)
450 ch = getchar();
451 return (first == 'y' || first == 'Y');
452}
453
454#define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2])))
455void
456checkdot(char **argv)
457{
458 char *p, **save, **t;
459 int complained;
460
461 complained = 0;
462 for (t = argv; *t;) {
463 if ((p = strrchr(*t, '/')) != NULL)
464 ++p;
465 else
466 p = *t;
467 if (ISDOT(p)) {
468 if (!complained++)
469 warnx("\".\" and \"..\" may not be removed");
470 eval = 1;
471 for (save = t; (t[0] = t[1]) != NULL; ++t)
472 continue;
473 t = save;
474 } else
475 ++t;
476 }
477}
478
479void
480usage(void)
481{
482
483 (void)fprintf(stderr, "%s\n%s\n",
484 "usage: rm [-f | -i] [-dPRrvW] file ...",
485 " unlink file");
486 exit(EX_USAGE);
487}
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