source: trunk/src/gmake/kmkbuiltin/rm.c@ 348

Last change on this file since 348 was 341, checked in by bird, 20 years ago

libc warning.
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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: src/bin/rm/rm.c,v 1.47 2004/04/06 20:06:50 markm Exp $");
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 <stdio.h>
55#include <stdlib.h>
56#include <string.h>
57#include <sysexits.h>
58#include <unistd.h>
59
60#ifdef __EMX__
61#undef S_IFWHT
62#undef S_ISWHT
63#endif
64#ifndef S_IFWHT
65#define S_IFWHT 0
66#define S_ISWHT(s) 0
67#define undelete(s) (-1)
68#endif
69
70#ifndef __FreeBSD__
71extern void strmode(mode_t mode, char *p);
72#endif
73
74static int dflag, eval, fflag, iflag, Pflag, vflag, Wflag, stdin_ok;
75static uid_t uid;
76
77static char *argv0;
78
79static int check(char *, char *, struct stat *);
80static void checkdot(char **);
81static void rm_file(char **);
82static int rm_overwrite(char *, struct stat *);
83static void rm_tree(char **);
84static int usage(void);
85
86/*
87 * rm --
88 * This rm is different from historic rm's, but is expected to match
89 * POSIX 1003.2 behavior. The most visible difference is that -f
90 * has two specific effects now, ignore non-existent files and force
91 * file removal.
92 */
93int
94kmk_builtin_rm(int argc, char *argv[])
95{
96 int ch, rflag;
97 char *p;
98
99 argv0 = argv[0];
100 dflag = eval = fflag = iflag = Pflag = vflag = Wflag = stdin_ok = 0;
101 uid = 0;
102 opterr = 1;
103 optarg = NULL;
104 optopt = 0;
105#if defined(__FreeBSD__) || defined(__EMX__)
106 optreset = 1;
107 optind = 1;
108#else
109 optind = 0; /* init */
110#endif
111
112 /*
113 * Test for the special case where the utility is called as
114 * "unlink", for which the functionality provided is greatly
115 * simplified.
116 */
117 if ((p = rindex(argv[0], '/')) == NULL)
118 p = argv[0];
119 else
120 ++p;
121 if (strcmp(p, "unlink") == 0) {
122 while (getopt(argc, argv, "") != -1)
123 return usage();
124 argc -= optind;
125 argv += optind;
126 if (argc != 1)
127 return usage();
128 rm_file(&argv[0]);
129 return eval;
130 }
131
132 Pflag = rflag = 0;
133 while ((ch = getopt(argc, argv, "dfiPRrvW")) != -1)
134 switch(ch) {
135 case 'd':
136 dflag = 1;
137 break;
138 case 'f':
139 fflag = 1;
140 iflag = 0;
141 break;
142 case 'i':
143 fflag = 0;
144 iflag = 1;
145 break;
146 case 'P':
147 Pflag = 1;
148 break;
149 case 'R':
150 case 'r': /* Compatibility. */
151 rflag = 1;
152 break;
153 case 'v':
154 vflag = 1;
155 break;
156#ifdef FTS_WHITEOUT
157 case 'W':
158 Wflag = 1;
159 break;
160#endif
161 default:
162 return usage();
163 }
164 argc -= optind;
165 argv += optind;
166
167 if (argc < 1) {
168 if (fflag)
169 return (0);
170 return usage();
171 }
172
173 checkdot(argv);
174 uid = geteuid();
175
176 if (*argv) {
177 stdin_ok = isatty(STDIN_FILENO);
178
179 if (rflag)
180 rm_tree(argv);
181 else
182 rm_file(argv);
183 }
184
185 return eval;
186}
187
188static void
189rm_tree(char **argv)
190{
191 FTS *fts;
192 FTSENT *p;
193 int needstat;
194 int flags;
195 int rval;
196
197 /*
198 * Remove a file hierarchy. If forcing removal (-f), or interactive
199 * (-i) or can't ask anyway (stdin_ok), don't stat the file.
200 */
201 needstat = !uid || (!fflag && !iflag && stdin_ok);
202
203 /*
204 * If the -i option is specified, the user can skip on the pre-order
205 * visit. The fts_number field flags skipped directories.
206 */
207#define SKIPPED 1
208
209 flags = FTS_PHYSICAL;
210 if (!needstat)
211 flags |= FTS_NOSTAT;
212#ifdef FTS_WHITEOUT
213 if (Wflag)
214 flags |= FTS_WHITEOUT;
215#endif
216 if (!(fts = fts_open(argv, flags, NULL)))
217 err(1, "fts_open");
218 while ((p = fts_read(fts)) != NULL) {
219 switch (p->fts_info) {
220 case FTS_DNR:
221 if (!fflag || p->fts_errno != ENOENT) {
222 fprintf(stderr, "%s: %s: %s\n",
223 argv0, p->fts_path, strerror(p->fts_errno));
224 eval = 1;
225 }
226 continue;
227 case FTS_ERR:
228 errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno));
229 case FTS_NS:
230 /*
231 * Assume that since fts_read() couldn't stat the
232 * file, it can't be unlinked.
233 */
234 if (!needstat)
235 break;
236 if (!fflag || p->fts_errno != ENOENT) {
237 fprintf(stderr, "%s: %s: %s\n",
238 argv0, p->fts_path, strerror(p->fts_errno));
239 eval = 1;
240 }
241 continue;
242 case FTS_D:
243 /* Pre-order: give user chance to skip. */
244 if (!fflag && !check(p->fts_path, p->fts_accpath,
245 p->fts_statp)) {
246 (void)fts_set(fts, p, FTS_SKIP);
247 p->fts_number = SKIPPED;
248 }
249#ifdef UF_APPEND
250 else if (!uid &&
251 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
252 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
253 chflags(p->fts_accpath,
254 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)) < 0)
255 goto err;
256#endif
257 continue;
258 case FTS_DP:
259 /* Post-order: see if user skipped. */
260 if (p->fts_number == SKIPPED)
261 continue;
262 break;
263 default:
264 if (!fflag &&
265 !check(p->fts_path, p->fts_accpath, p->fts_statp))
266 continue;
267 }
268
269 rval = 0;
270#ifdef UF_APPEND
271 if (!uid &&
272 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
273 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)))
274 rval = chflags(p->fts_accpath,
275 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE));
276#endif
277 if (rval == 0) {
278 /*
279 * If we can't read or search the directory, may still be
280 * able to remove it. Don't print out the un{read,search}able
281 * message unless the remove fails.
282 */
283 switch (p->fts_info) {
284 case FTS_DP:
285 case FTS_DNR:
286 rval = rmdir(p->fts_accpath);
287 if (rval == 0 || (fflag && errno == ENOENT)) {
288 if (rval == 0 && vflag)
289 (void)printf("%s\n",
290 p->fts_path);
291 continue;
292 }
293 break;
294
295#ifdef FTS_W
296 case FTS_W:
297 rval = undelete(p->fts_accpath);
298 if (rval == 0 && (fflag && errno == ENOENT)) {
299 if (vflag)
300 (void)printf("%s\n",
301 p->fts_path);
302 continue;
303 }
304 break;
305#endif
306
307 case FTS_NS:
308 /*
309 * Assume that since fts_read() couldn't stat
310 * the file, it can't be unlinked.
311 */
312 if (fflag)
313 continue;
314 /* FALLTHROUGH */
315 default:
316 if (Pflag)
317 if (!rm_overwrite(p->fts_accpath, NULL))
318 continue;
319 rval = unlink(p->fts_accpath);
320 if (rval == 0 || (fflag && errno == ENOENT)) {
321 if (rval == 0 && vflag)
322 (void)printf("%s\n",
323 p->fts_path);
324 continue;
325 }
326 }
327 }
328err:
329 fprintf(stderr, "%s: %s: %s\n", argv0, p->fts_path, strerror(errno));
330 eval = 1;
331 }
332 if (errno) {
333 fprintf(stderr, "%s: fts_read: %s\n", argv0, strerror(errno));
334 eval = 1;
335 }
336}
337
338static void
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#ifdef FTS_WHITEOUT
353 if (Wflag) {
354 sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR;
355 } else {
356#else
357 {
358#endif
359 if (!fflag || errno != ENOENT) {
360 fprintf(stderr, "%s: %s: %s\n", argv0, f, strerror(errno));
361 eval = 1;
362 }
363 continue;
364 }
365#ifdef FTS_WHITEOUT
366 } else if (Wflag) {
367 fprintf(stderr, "%s: %s: %s\n", argv0, f, strerror(EEXIST));
368 eval = 1;
369 continue;
370#endif
371 }
372
373 if (S_ISDIR(sb.st_mode) && !dflag) {
374 fprintf(stderr, "%s: %s: is a directory\n", argv0, f);
375 eval = 1;
376 continue;
377 }
378 if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb))
379 continue;
380 rval = 0;
381#ifdef UF_APPEND
382 if (!uid &&
383 (sb.st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
384 !(sb.st_flags & (SF_APPEND|SF_IMMUTABLE)))
385 rval = chflags(f, sb.st_flags & ~(UF_APPEND|UF_IMMUTABLE));
386#endif
387 if (rval == 0) {
388 if (S_ISWHT(sb.st_mode))
389 rval = undelete(f);
390 else if (S_ISDIR(sb.st_mode))
391 rval = rmdir(f);
392 else {
393 if (Pflag)
394 if (!rm_overwrite(f, &sb))
395 continue;
396 rval = unlink(f);
397 }
398 }
399 if (rval && (!fflag || errno != ENOENT)) {
400 fprintf(stderr, "%s: %s: %s\n", argv0, f, strerror(errno));
401 eval = 1;
402 }
403 if (vflag && rval == 0)
404 (void)printf("%s\n", f);
405 }
406}
407
408/*
409 * rm_overwrite --
410 * Overwrite the file 3 times with varying bit patterns.
411 *
412 * XXX
413 * This is a cheap way to *really* delete files. Note that only regular
414 * files are deleted, directories (and therefore names) will remain.
415 * Also, this assumes a fixed-block file system (like FFS, or a V7 or a
416 * System V file system). In a logging file system, you'll have to have
417 * kernel support.
418 */
419static int
420rm_overwrite(char *file, struct stat *sbp)
421{
422 struct stat sb;
423#ifdef HAVE_FSTATFS
424 struct statfs fsb;
425#endif
426 off_t len;
427 int bsize, fd, wlen;
428 char *buf = NULL;
429
430 fd = -1;
431 if (sbp == NULL) {
432 if (lstat(file, &sb))
433 goto err;
434 sbp = &sb;
435 }
436 if (!S_ISREG(sbp->st_mode))
437 return (1);
438 if ((fd = open(file, O_WRONLY, 0)) == -1)
439 goto err;
440#ifdef HAVE_FSTATFS
441 if (fstatfs(fd, &fsb) == -1)
442 goto err;
443 bsize = MAX(fsb.f_iosize, 1024);
444#elif defined(HAVE_ST_BLKSIZE)
445 bsize = MAX(sb.st_blksize, 1024);
446#else
447 bsize = 1024;
448#endif
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 fprintf(stderr, "%s: %s: %s\n", argv0, file, strerror(errno));
478 return (0);
479}
480
481
482static int
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 * Also skip this check if the -P option was specified because
498 * we will not be able to overwrite file contents and will
499 * barf later.
500 */
501 if (!stdin_ok || S_ISLNK(sp->st_mode) || Pflag ||
502 (!access(name, W_OK) &&
503#ifdef SF_APPEND
504 !(sp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
505 (!(sp->st_flags & (UF_APPEND|UF_IMMUTABLE)) || !uid))
506#else
507 1)
508#endif
509 )
510 return (1);
511 strmode(sp->st_mode, modep);
512#ifdef SF_APPEND
513 if ((flagsp = fflagstostr(sp->st_flags)) == NULL)
514 err(1, "fflagstostr");
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#else
523 (void)fprintf(stderr, "override %s%s %d/%d for %s? ",
524 modep + 1, modep[9] == ' ' ? "" : " ",
525 sp->st_uid, sp->st_gid, path);
526#endif
527 }
528 (void)fflush(stderr);
529
530 first = ch = getchar();
531 while (ch != '\n' && ch != EOF)
532 ch = getchar();
533 return (first == 'y' || first == 'Y');
534}
535
536#define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2])))
537static void
538checkdot(char **argv)
539{
540 char *p, **save, **t;
541 int complained;
542
543 complained = 0;
544 for (t = argv; *t;) {
545 if ((p = strrchr(*t, '/')) != NULL)
546 ++p;
547 else
548 p = *t;
549 if (ISDOT(p)) {
550 if (!complained++)
551 fprintf(stderr, "%s: \".\" and \"..\" may not be removed\n", argv0);
552 eval = 1;
553 for (save = t; (t[0] = t[1]) != NULL; ++t)
554 continue;
555 t = save;
556 } else
557 ++t;
558 }
559}
560
561static int
562usage(void)
563{
564
565 (void)fprintf(stderr, "%s\n%s\n",
566 "usage: rm [-f | -i] [-dPRrvW] file ...\n",
567 " unlink file");
568 return EX_USAGE;
569}
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