NetBSD/bin/rm/rm.c

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/* $NetBSD: rm.c,v 1.19 1995/09/07 06:48:50 jtc Exp $ */
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/*-
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* Copyright (c) 1990, 1993, 1994
* The Regents of the University of California. All rights reserved.
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*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
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static char copyright[] =
"@(#) Copyright (c) 1990, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
#ifndef lint
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#if 0
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static char sccsid[] = "@(#)rm.c 8.8 (Berkeley) 4/27/95";
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#else
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static char rcsid[] = "$NetBSD: rm.c,v 1.19 1995/09/07 06:48:50 jtc Exp $";
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#endif
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#endif /* not lint */
#include <sys/types.h>
#include <sys/stat.h>
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#include <locale.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <fts.h>
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
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int dflag, eval, fflag, iflag, Pflag, Wflag, stdin_ok;
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int check __P((char *, char *, struct stat *));
void checkdot __P((char **));
void rm_file __P((char **));
void rm_overwrite __P((char *, struct stat *));
void rm_tree __P((char **));
void usage __P((void));
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/*
* rm --
* This rm is different from historic rm's, but is expected to match
* POSIX 1003.2 behavior. The most visible difference is that -f
* has two specific effects now, ignore non-existent files and force
* file removal.
*/
int
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main(argc, argv)
int argc;
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char *argv[];
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{
int ch, rflag;
setlocale(LC_ALL, "");
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Pflag = rflag = 0;
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while ((ch = getopt(argc, argv, "dfiPRrW")) != -1)
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switch(ch) {
case 'd':
dflag = 1;
break;
case 'f':
fflag = 1;
iflag = 0;
break;
case 'i':
fflag = 0;
iflag = 1;
break;
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case 'P':
Pflag = 1;
break;
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case 'R':
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case 'r': /* Compatibility. */
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rflag = 1;
break;
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case 'W':
Wflag = 1;
break;
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case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if (argc < 1)
usage();
checkdot(argv);
if (*argv) {
stdin_ok = isatty(STDIN_FILENO);
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if (rflag)
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rm_tree(argv);
else
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rm_file(argv);
}
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exit (eval);
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}
void
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rm_tree(argv)
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char **argv;
{
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FTS *fts;
FTSENT *p;
int needstat;
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int flags;
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/*
* Remove a file hierarchy. If forcing removal (-f), or interactive
* (-i) or can't ask anyway (stdin_ok), don't stat the file.
*/
needstat = !fflag && !iflag && stdin_ok;
/*
* If the -i option is specified, the user can skip on the pre-order
* visit. The fts_number field flags skipped directories.
*/
#define SKIPPED 1
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flags = FTS_PHYSICAL;
if (!needstat)
flags |= FTS_NOSTAT;
if (Wflag)
flags |= FTS_WHITEOUT;
if (!(fts = fts_open(argv, flags, (int (*)())NULL)))
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err(1, NULL);
while ((p = fts_read(fts)) != NULL) {
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switch (p->fts_info) {
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case FTS_DNR:
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if (!fflag || p->fts_errno != ENOENT) {
warnx("%s: %s",
p->fts_path, strerror(p->fts_errno));
eval = 1;
}
continue;
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case FTS_ERR:
errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno));
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case FTS_NS:
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/*
* FTS_NS: assume that if can't stat the file, it
* can't be unlinked.
*/
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if (!needstat)
break;
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if (!fflag || p->fts_errno != ENOENT) {
warnx("%s: %s",
p->fts_path, strerror(p->fts_errno));
eval = 1;
}
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continue;
case FTS_D:
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/* Pre-order: give user chance to skip. */
if (!fflag && !check(p->fts_path, p->fts_accpath,
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p->fts_statp)) {
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(void)fts_set(fts, p, FTS_SKIP);
p->fts_number = SKIPPED;
}
continue;
case FTS_DP:
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/* Post-order: see if user skipped. */
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if (p->fts_number == SKIPPED)
continue;
break;
default:
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if (!fflag &&
!check(p->fts_path, p->fts_accpath, p->fts_statp))
continue;
}
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/*
* If we can't read or search the directory, may still be
* able to remove it. Don't print out the un{read,search}able
* message unless the remove fails.
*/
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switch (p->fts_info) {
case FTS_DP:
case FTS_DNR:
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if (!rmdir(p->fts_accpath) || fflag && errno == ENOENT)
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continue;
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break;
case FTS_W:
if (!undelete(p->fts_accpath) ||
fflag && errno == ENOENT)
continue;
break;
default:
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if (Pflag)
rm_overwrite(p->fts_accpath, NULL);
if (!unlink(p->fts_accpath) || fflag && errno == ENOENT)
continue;
}
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warn("%s", p->fts_path);
eval = 1;
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}
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if (errno)
err(1, "fts_read");
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}
void
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rm_file(argv)
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char **argv;
{
struct stat sb;
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int rval;
char *f;
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/*
* Remove a file. POSIX 1003.2 states that, by default, attempting
* to remove a directory is an error, so must always stat the file.
*/
while ((f = *argv++) != NULL) {
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/* Assume if can't stat the file, can't unlink it. */
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if (lstat(f, &sb)) {
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if (Wflag) {
sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR;
} else {
if (!fflag || errno != ENOENT) {
warn("%s", f);
eval = 1;
}
continue;
}
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} else if (Wflag) {
warnx("%s: %s", f, strerror(EEXIST));
eval = 1;
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continue;
}
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if (S_ISDIR(sb.st_mode) && !dflag) {
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warnx("%s: is a directory", f);
eval = 1;
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continue;
}
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if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb))
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continue;
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if (S_ISWHT(sb.st_mode))
rval = undelete(f);
else if (S_ISDIR(sb.st_mode))
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rval = rmdir(f);
else {
if (Pflag)
rm_overwrite(f, &sb);
rval = unlink(f);
}
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if (rval && (!fflag || errno != ENOENT)) {
warn("%s", f);
eval = 1;
}
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}
}
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/*
* rm_overwrite --
* Overwrite the file 3 times with varying bit patterns.
*
* XXX
* This is a cheap way to *really* delete files. Note that only regular
* files are deleted, directories (and therefore names) will remain.
* Also, this assumes a fixed-block file system (like FFS, or a V7 or a
* System V file system). In a logging file system, you'll have to have
* kernel support.
*/
void
rm_overwrite(file, sbp)
char *file;
struct stat *sbp;
{
struct stat sb;
off_t len;
int fd, wlen;
char buf[8 * 1024];
fd = -1;
if (sbp == NULL) {
if (lstat(file, &sb))
goto err;
sbp = &sb;
}
if (!S_ISREG(sbp->st_mode))
return;
if ((fd = open(file, O_WRONLY, 0)) == -1)
goto err;
#define PASS(byte) { \
memset(buf, byte, sizeof(buf)); \
for (len = sbp->st_size; len > 0; len -= wlen) { \
wlen = len < sizeof(buf) ? len : sizeof(buf); \
if (write(fd, buf, wlen) != wlen) \
goto err; \
} \
}
PASS(0xff);
if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
goto err;
PASS(0x00);
if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
goto err;
PASS(0xff);
if (!fsync(fd) && !close(fd))
return;
err: eval = 1;
warn("%s", file);
}
int
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check(path, name, sp)
char *path, *name;
struct stat *sp;
{
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int ch, first;
char modep[15];
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/* Check -i first. */
if (iflag)
(void)fprintf(stderr, "remove %s? ", path);
else {
/*
* If it's not a symbolic link and it's unwritable and we're
* talking to a terminal, ask. Symbolic links are excluded
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* because their permissions are meaningless. Check stdin_ok
* first because we may not have stat'ed the file.
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*/
if (!stdin_ok || S_ISLNK(sp->st_mode) || !access(name, W_OK))
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return (1);
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strmode(sp->st_mode, modep);
(void)fprintf(stderr, "override %s%s%s/%s for %s? ",
modep + 1, modep[9] == ' ' ? "" : " ",
user_from_uid(sp->st_uid, 0),
group_from_gid(sp->st_gid, 0), path);
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}
(void)fflush(stderr);
first = ch = getchar();
while (ch != '\n' && ch != EOF)
ch = getchar();
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return (first == 'y' || first == 'Y');
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}
/*
* POSIX.2 requires that if "." or ".." are specified as the basename
* portion of an operand, a diagnostic message be written to standard
* error and nothing more be done with such operands.
*
* Since POSIX.2 defines basename as the final portion of a path after
* trailing slashes have been removed, we'll remove them here.
*/
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#define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || (a)[1] == '.' && !(a)[2]))
void
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checkdot(argv)
char **argv;
{
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char *p, **save, **t;
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int complained;
complained = 0;
for (t = argv; *t;) {
/* strip trailing slashes */
p = strrchr (*t, '\0');
while (--p > *t && *p == '/')
*p = '\0';
/* extract basename */
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if ((p = strrchr(*t, '/')) != NULL)
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++p;
else
p = *t;
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if (ISDOT(p)) {
if (!complained++)
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warnx("\".\" and \"..\" may not be removed");
eval = 1;
for (save = t; (t[0] = t[1]) != NULL; ++t)
continue;
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t = save;
} else
++t;
}
}
void
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usage()
{
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(void)fprintf(stderr, "usage: rm [-dfiPRrW] file ...\n");
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exit(1);
}