Initial import from FreeBSD RELENG_4:
[dragonfly.git] / bin / rm / rm.c
CommitLineData
984263bc
MD
1/*-
2 * Copyright (c) 1990, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
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#endif
44#endif /* not lint */
45#include <sys/cdefs.h>
46__FBSDID("$FreeBSD: src/bin/rm/rm.c,v 1.29.2.5 2002/07/12 07:25:48 tjr Exp $");
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 <stdio.h>
57#include <stdlib.h>
58#include <string.h>
59#include <sysexits.h>
60#include <unistd.h>
61
62int dflag, eval, fflag, iflag, Pflag, vflag, Wflag, stdin_ok;
63uid_t uid;
64
65int check(char *, char *, struct stat *);
66void checkdot(char **);
67void rm_file(char **);
68void rm_overwrite(char *, struct stat *);
69void rm_tree(char **);
70void usage(void);
71
72/*
73 * rm --
74 * This rm is different from historic rm's, but is expected to match
75 * POSIX 1003.2 behavior. The most visible difference is that -f
76 * has two specific effects now, ignore non-existent files and force
77 * file removal.
78 */
79int
80main(int argc, char *argv[])
81{
82 int ch, rflag;
83 char *p;
84
85 /*
86 * Test for the special case where the utility is called as
87 * "unlink", for which the functionality provided is greatly
88 * simplified.
89 */
90 if ((p = rindex(argv[0], '/')) == NULL)
91 p = argv[0];
92 else
93 ++p;
94 if (strcmp(p, "unlink") == 0) {
95 while (getopt(argc, argv, "") != -1)
96 usage();
97 argc -= optind;
98 argv += optind;
99 if (argc != 1)
100 usage();
101 rm_file(&argv[0]);
102 exit(eval);
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 filesystem (like FFS, or a V7 or a
359 * System V filesystem). In a logging filesystem, 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}