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[] =
45 "$Id: rm.c,v 1.19 1999/02/25 22:18:08 jkh Exp $";
46#endif
47#endif /* not lint */
48
49#include <sys/types.h>
50#include <sys/stat.h>
51#include <sys/param.h>
52#include <sys/mount.h>
53
54#include <err.h>
55#include <errno.h>
56#include <fcntl.h>
57#include <fts.h>
58#include <stdio.h>
59#include <stdlib.h>
60#include <string.h>
61#include <unistd.h>
62
63extern char *flags_to_string __P((u_long, char *));
64
65int dflag, eval, fflag, iflag, Pflag, Wflag, stdin_ok;
66uid_t uid;
67
68int check __P((char *, char *, struct stat *));
69void checkdot __P((char **));
70void rm_file __P((char **));
71void rm_overwrite __P((char *, struct stat *));
72void rm_tree __P((char **));
73void usage __P((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(argc, argv)
84 int argc;
85 char *argv[];
86{
87 int ch, rflag;
88
89 Pflag = rflag = 0;
90 while ((ch = getopt(argc, argv, "dfiPRrW")) != -1)
91 switch(ch) {
92 case 'd':
93 dflag = 1;
94 break;
95 case 'f':
96 fflag = 1;
97 iflag = 0;
98 break;
99 case 'i':
100 fflag = 0;
101 iflag = 1;
102 break;
103 case 'P':
104 Pflag = 1;
105 break;
106 case 'R':
107 case 'r': /* Compatibility. */
108 rflag = 1;
109 break;
110 case 'W':
111 Wflag = 1;
112 break;
113 default:
114 usage();
115 }
116 argc -= optind;
117 argv += optind;
118
119 if (argc < 1) {
120 if (fflag)
121 return 0;
122 usage();
123 }
124
125 checkdot(argv);
126 uid = geteuid();
127
128 if (*argv) {
129 stdin_ok = isatty(STDIN_FILENO);
130
131 if (rflag)
132 rm_tree(argv);
133 else
134 rm_file(argv);
135 }
136
137 exit (eval);
138}
139
140void
141rm_tree(argv)
142 char **argv;
143{
144 FTS *fts;
145 FTSENT *p;
146 int needstat;
147 int flags;
148 int rval;
149
150 /*
151 * Remove a file hierarchy. If forcing removal (-f), or interactive
152 * (-i) or can't ask anyway (stdin_ok), don't stat the file.
153 */
154 needstat = !uid || (!fflag && !iflag && stdin_ok);
155
156 /*
157 * If the -i option is specified, the user can skip on the pre-order
158 * visit. The fts_number field flags skipped directories.
159 */
160#define SKIPPED 1
161
162 flags = FTS_PHYSICAL | FTS_NOCHDIR;
163 if (!needstat)
164 flags |= FTS_NOSTAT;
165 if (Wflag)
166 flags |= FTS_WHITEOUT;
167 if (!(fts = fts_open(argv, flags, (int (*)())NULL)))
168 err(1, NULL);
169 while ((p = fts_read(fts)) != NULL) {
170 switch (p->fts_info) {
171 case FTS_DNR:
172 if (!fflag || p->fts_errno != ENOENT) {
173 warnx("%s: %s",
174 p->fts_path, strerror(p->fts_errno));
175 eval = 1;
176 }
177 continue;
178 case FTS_ERR:
179 errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno));
180 case FTS_NS:
181 /*
182 * FTS_NS: assume that if can't stat the file, it
183 * can't be unlinked.
184 */
185 if (!needstat)
186 break;
187 if (!fflag || p->fts_errno != ENOENT) {
188 warnx("%s: %s",
189 p->fts_path, strerror(p->fts_errno));
190 eval = 1;
191 }
192 continue;
193 case FTS_D:
194 /* Pre-order: give user chance to skip. */
195 if (!fflag && !check(p->fts_path, p->fts_accpath,
196 p->fts_statp)) {
197 (void)fts_set(fts, p, FTS_SKIP);
198 p->fts_number = SKIPPED;
199 }
200 else if (!uid &&
201 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
202 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
203 chflags(p->fts_accpath,
204 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)) < 0)
205 goto err;
206 continue;
207 case FTS_DP:
208 /* Post-order: see if user skipped. */
209 if (p->fts_number == SKIPPED)
210 continue;
211 break;
212 default:
213 if (!fflag &&
214 !check(p->fts_path, p->fts_accpath, p->fts_statp))
215 continue;
216 }
217
218 rval = 0;
219 if (!uid &&
220 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
221 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)))
222 rval = chflags(p->fts_accpath,
223 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE));
224 if (!rval) {
225 /*
226 * If we can't read or search the directory, may still be
227 * able to remove it. Don't print out the un{read,search}able
228 * message unless the remove fails.
229 */
230 switch (p->fts_info) {
231 case FTS_DP:
232 case FTS_DNR:
233 if (!rmdir(p->fts_accpath) || (fflag && errno == ENOENT))
234 continue;
235 break;
236
237 case FTS_W:
238 if (!undelete(p->fts_accpath) ||
239 (fflag && errno == ENOENT))
240 continue;
241 break;
242
243 default:
244 if (Pflag)
245 rm_overwrite(p->fts_accpath, NULL);
246 if (!unlink(p->fts_accpath) || (fflag && errno == ENOENT))
247 continue;
248 }
249 }
250err:
251 warn("%s", p->fts_path);
252 eval = 1;
253 }
254 if (errno)
255 err(1, "fts_read");
256}
257
258void
259rm_file(argv)
260 char **argv;
261{
262 struct stat sb;
263 int rval;
264 char *f;
265
266 /*
267 * Remove a file. POSIX 1003.2 states that, by default, attempting
268 * to remove a directory is an error, so must always stat the file.
269 */
270 while ((f = *argv++) != NULL) {
271 /* Assume if can't stat the file, can't unlink it. */
272 if (lstat(f, &sb)) {
273 if (Wflag) {
274 sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR;
275 } else {
276 if (!fflag || errno != ENOENT) {
277 warn("%s", f);
278 eval = 1;
279 }
280 continue;
281 }
282 } else if (Wflag) {
283 warnx("%s: %s", f, strerror(EEXIST));
284 eval = 1;
285 continue;
286 }
287
288 if (S_ISDIR(sb.st_mode) && !dflag) {
289 warnx("%s: is a directory", f);
290 eval = 1;
291 continue;
292 }
293 if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb))
294 continue;
295 rval = 0;
296 if (!uid &&
297 (sb.st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
298 !(sb.st_flags & (SF_APPEND|SF_IMMUTABLE)))
299 rval = chflags(f, sb.st_flags & ~(UF_APPEND|UF_IMMUTABLE));
300 if (!rval) {
301 if (S_ISWHT(sb.st_mode))
302 rval = undelete(f);
303 else if (S_ISDIR(sb.st_mode))
304 rval = rmdir(f);
305 else {
306 if (Pflag)
307 rm_overwrite(f, &sb);
308 rval = unlink(f);
309 }
310 }
311 if (rval && (!fflag || errno != ENOENT)) {
312 warn("%s", f);
313 eval = 1;
314 }
315 }
316}
317
318/*
319 * rm_overwrite --
320 * Overwrite the file 3 times with varying bit patterns.
321 *
322 * XXX
323 * This is a cheap way to *really* delete files. Note that only regular
324 * files are deleted, directories (and therefore names) will remain.
325 * Also, this assumes a fixed-block file system (like FFS, or a V7 or a
326 * System V file system). In a logging file system, you'll have to have
327 * kernel support.
328 */
329void
330rm_overwrite(file, sbp)
331 char *file;
332 struct stat *sbp;
333{
334 struct stat sb;
335 struct statfs fsb;
336 off_t len;
337 int bsize, fd, wlen;
338 char *buf = NULL;
339
340 fd = -1;
341 if (sbp == NULL) {
342 if (lstat(file, &sb))
343 goto err;
344 sbp = &sb;
345 }
346 if (!S_ISREG(sbp->st_mode))
347 return;
348 if ((fd = open(file, O_WRONLY, 0)) == -1)
349 goto err;
350 if (fstatfs(fd, &fsb) == -1)
351 goto err;
352 bsize = MAX(fsb.f_iosize, 1024);
353 if ((buf = malloc(bsize)) == NULL)
354 err(1, "malloc");
355
356#define PASS(byte) { \
357 memset(buf, byte, bsize); \
358 for (len = sbp->st_size; len > 0; len -= wlen) { \
359 wlen = len < bsize ? len : bsize; \
360 if (write(fd, buf, wlen) != wlen) \
361 goto err; \
362 } \
363}
364 PASS(0xff);
365 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
366 goto err;
367 PASS(0x00);
368 if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
369 goto err;
370 PASS(0xff);
371 if (!fsync(fd) && !close(fd)) {
372 free(buf);
373 return;
374 }
375
376err: eval = 1;
377 if (buf)
378 free(buf);
379 warn("%s", file);
380}
381
382
383int
384check(path, name, sp)
385 char *path, *name;
386 struct stat *sp;
387{
388 int ch, first;
389 char modep[15], flagsp[128];
390
391 /* Check -i first. */
392 if (iflag)
393 (void)fprintf(stderr, "remove %s? ", path);
394 else {
395 /*
396 * If it's not a symbolic link and it's unwritable and we're
397 * talking to a terminal, ask. Symbolic links are excluded
398 * because their permissions are meaningless. Check stdin_ok
399 * first because we may not have stat'ed the file.
400 */
401 if (!stdin_ok || S_ISLNK(sp->st_mode) ||
402 (!access(name, W_OK) &&
403 !(sp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
404 (!(sp->st_flags & (UF_APPEND|UF_IMMUTABLE)) || !uid)))
405 return (1);
406 strmode(sp->st_mode, modep);
407 strcpy(flagsp, flags_to_string(sp->st_flags, NULL));
408 if (*flagsp)
409 strcat(flagsp, " ");
410 (void)fprintf(stderr, "override %s%s%s/%s %sfor %s? ",
411 modep + 1, modep[9] == ' ' ? "" : " ",
412 user_from_uid(sp->st_uid, 0),
413 group_from_gid(sp->st_gid, 0),
414 *flagsp ? flagsp : "",
415 path);
416 }
417 (void)fflush(stderr);
418
419 first = ch = getchar();
420 while (ch != '\n' && ch != EOF)
421 ch = getchar();
422 return (first == 'y' || first == 'Y');
423}
424
425#define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2])))
426void
427checkdot(argv)
428 char **argv;
429{
430 char *p, **save, **t;
431 int complained;
432
433 complained = 0;
434 for (t = argv; *t;) {
435 if ((p = strrchr(*t, '/')) != NULL)
436 ++p;
437 else
438 p = *t;
439 if (ISDOT(p)) {
440 if (!complained++)
441 warnx("\".\" and \"..\" may not be removed");
442 eval = 1;
443 for (save = t; (t[0] = t[1]) != NULL; ++t)
444 continue;
445 t = save;
446 } else
447 ++t;
448 }
449}
450
451void
452usage()
453{
454
455 (void)fprintf(stderr, "usage: rm [-f | -i] [-dPRrW] file ...\n");
456 exit(1);
457}