438 lines
10 KiB
C
438 lines
10 KiB
C
/* $NetBSD: rm.c,v 1.29 2001/12/20 20:10:34 soren Exp $ */
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/*-
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* Copyright (c) 1990, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1990, 1993, 1994\n\
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The Regents of the University of California. All rights reserved.\n");
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#endif /* not lint */
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#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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__RCSID("$NetBSD: rm.c,v 1.29 2001/12/20 20:10:34 soren Exp $");
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#endif
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <locale.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <fts.h>
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#include <grp.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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int dflag, eval, fflag, iflag, Pflag ,stdin_ok, Wflag;
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int check(char *, char *, struct stat *);
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void checkdot(char **);
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void rm_file(char **);
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void rm_overwrite(char *, struct stat *);
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void rm_tree(char **);
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void usage(void);
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int main(int, char *[]);
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/*
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* For the sake of the `-f' flag, check whether an error number indicates the
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* failure of an operation due to an non-existent file, either per se (ENOENT)
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* or because its filename argument was illegal (ENAMETOOLONG, ENOTDIR).
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*/
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#define NONEXISTENT(x) \
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((x) == ENOENT || (x) == ENAMETOOLONG || (x) == ENOTDIR)
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/*
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* rm --
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* This rm is different from historic rm's, but is expected to match
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* POSIX 1003.2 behavior. The most visible difference is that -f
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* has two specific effects now, ignore non-existent files and force
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* file removal.
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*/
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int
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main(int argc, char *argv[])
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{
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int ch, rflag;
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setprogname(argv[0]);
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(void)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) {
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case 'd':
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dflag = 1;
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break;
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case 'f':
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fflag = 1;
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iflag = 0;
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break;
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case 'i':
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fflag = 0;
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iflag = 1;
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break;
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case 'P':
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Pflag = 1;
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break;
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case 'R':
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case 'r': /* Compatibility. */
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rflag = 1;
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break;
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case 'W':
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Wflag = 1;
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (argc < 1)
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usage();
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checkdot(argv);
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if (*argv) {
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stdin_ok = isatty(STDIN_FILENO);
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if (rflag)
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rm_tree(argv);
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else
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rm_file(argv);
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}
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exit(eval);
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/* NOTREACHED */
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}
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void
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rm_tree(char **argv)
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{
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FTS *fts;
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FTSENT *p;
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int flags, needstat;
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/*
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* Remove a file hierarchy. If forcing removal (-f), or interactive
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* (-i) or can't ask anyway (stdin_ok), don't stat the file.
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*/
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needstat = !fflag && !iflag && stdin_ok;
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/*
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* If the -i option is specified, the user can skip on the pre-order
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* visit. The fts_number field flags skipped directories.
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*/
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#define SKIPPED 1
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flags = FTS_PHYSICAL;
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if (!needstat)
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flags |= FTS_NOSTAT;
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if (Wflag)
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flags |= FTS_WHITEOUT;
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if (!(fts = fts_open(argv, flags,
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(int (*) __P((const FTSENT **, const FTSENT **)))NULL)))
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err(1, NULL);
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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) {
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warnx("%s: %s",
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p->fts_path, strerror(p->fts_errno));
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eval = 1;
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}
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continue;
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case FTS_ERR:
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errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno));
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/* NOTREACHED */
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case FTS_NS:
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/*
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* FTS_NS: assume that if can't stat the file, it
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* can't be unlinked.
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*/
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if (fflag && NONEXISTENT(p->fts_errno))
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continue;
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if (needstat) {
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warnx("%s: %s",
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p->fts_path, strerror(p->fts_errno));
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eval = 1;
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continue;
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}
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break;
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case FTS_D:
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/* Pre-order: give user chance to skip. */
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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);
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p->fts_number = SKIPPED;
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}
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continue;
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case FTS_DP:
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/* Post-order: see if user skipped. */
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if (p->fts_number == SKIPPED)
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continue;
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break;
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default:
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if (!fflag &&
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!check(p->fts_path, p->fts_accpath, p->fts_statp))
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continue;
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}
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/*
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* If we can't read or search the directory, may still be
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* able to remove it. Don't print out the un{read,search}able
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* message unless the remove fails.
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*/
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switch (p->fts_info) {
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case FTS_DP:
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case FTS_DNR:
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if (!rmdir(p->fts_accpath) ||
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(fflag && errno == ENOENT))
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continue;
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break;
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case FTS_W:
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if (!undelete(p->fts_accpath) ||
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(fflag && errno == ENOENT))
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continue;
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break;
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default:
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if (Pflag)
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rm_overwrite(p->fts_accpath, NULL);
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if (!unlink(p->fts_accpath) ||
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(fflag && NONEXISTENT(errno)))
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continue;
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}
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warn("%s", p->fts_path);
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eval = 1;
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}
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if (errno)
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err(1, "fts_read");
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}
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void
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rm_file(char **argv)
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{
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struct stat sb;
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int rval;
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char *f;
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/*
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* Remove a file. POSIX 1003.2 states that, by default, attempting
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* to remove a directory is an error, so must always stat the file.
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*/
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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) {
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sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR;
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} else {
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if (!fflag || !NONEXISTENT(errno)) {
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warn("%s", f);
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eval = 1;
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}
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continue;
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}
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} else if (Wflag) {
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warnx("%s: %s", f, strerror(EEXIST));
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eval = 1;
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continue;
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}
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if (S_ISDIR(sb.st_mode) && !dflag) {
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warnx("%s: is a directory", f);
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eval = 1;
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continue;
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}
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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))
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rval = undelete(f);
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else if (S_ISDIR(sb.st_mode))
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rval = rmdir(f);
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else {
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if (Pflag)
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rm_overwrite(f, &sb);
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rval = unlink(f);
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}
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if (rval && (!fflag || !NONEXISTENT(errno))) {
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warn("%s", f);
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eval = 1;
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}
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}
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}
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/*
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* rm_overwrite --
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* Overwrite the file 3 times with varying bit patterns.
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*
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* XXX
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* This is a cheap way to *really* delete files. Note that only regular
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* files are deleted, directories (and therefore names) will remain.
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* Also, this assumes a fixed-block file system (like FFS, or a V7 or a
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* System V file system). In a logging file system, you'll have to have
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* kernel support.
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*/
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void
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rm_overwrite(char *file, struct stat *sbp)
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{
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struct stat sb;
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off_t len;
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int fd, wlen;
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char buf[8 * 1024];
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fd = -1;
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if (sbp == NULL) {
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if (lstat(file, &sb))
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goto err;
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sbp = &sb;
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}
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if (!S_ISREG(sbp->st_mode))
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return;
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if ((fd = open(file, O_WRONLY, 0)) == -1)
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goto err;
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#define PASS(byte) { \
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memset(buf, byte, sizeof(buf)); \
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for (len = sbp->st_size; len > 0; len -= wlen) { \
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wlen = len < sizeof(buf) ? len : sizeof(buf); \
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if (write(fd, buf, wlen) != wlen) \
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goto err; \
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} \
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}
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PASS(0xff);
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if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
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goto err;
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PASS(0x00);
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if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
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goto err;
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PASS(0xff);
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if (!fsync(fd) && !close(fd))
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return;
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err: eval = 1;
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warn("%s", file);
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}
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int
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check(char *path, char *name, struct stat *sp)
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{
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int ch, first;
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char modep[15];
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/* Check -i first. */
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if (iflag)
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(void)fprintf(stderr, "remove %s? ", path);
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else {
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/*
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* If it's not a symbolic link and it's unwritable and we're
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* talking to a terminal, ask. Symbolic links are excluded
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* because their permissions are meaningless. Check stdin_ok
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* first because we may not have stat'ed the file.
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*/
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if (!stdin_ok || S_ISLNK(sp->st_mode) ||
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!(access(name, W_OK) && (errno != ETXTBSY)))
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return (1);
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strmode(sp->st_mode, modep);
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(void)fprintf(stderr, "override %s%s%s/%s for %s? ",
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modep + 1, modep[9] == ' ' ? "" : " ",
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user_from_uid(sp->st_uid, 0),
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group_from_gid(sp->st_gid, 0), path);
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}
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(void)fflush(stderr);
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first = ch = getchar();
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while (ch != '\n' && ch != EOF)
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ch = getchar();
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return (first == 'y' || first == 'Y');
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}
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/*
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* POSIX.2 requires that if "." or ".." are specified as the basename
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* portion of an operand, a diagnostic message be written to standard
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* error and nothing more be done with such operands.
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*
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* Since POSIX.2 defines basename as the final portion of a path after
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* trailing slashes have been removed, we'll remove them here.
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*/
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#define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2])))
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void
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checkdot(char **argv)
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{
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char *p, **save, **t;
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int complained;
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complained = 0;
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for (t = argv; *t;) {
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/* strip trailing slashes */
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p = strrchr (*t, '\0');
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while (--p > *t && *p == '/')
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*p = '\0';
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/* extract basename */
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if ((p = strrchr(*t, '/')) != NULL)
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++p;
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else
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p = *t;
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if (ISDOT(p)) {
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if (!complained++)
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warnx("\".\" and \"..\" may not be removed");
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eval = 1;
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for (save = t; (t[0] = t[1]) != NULL; ++t)
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continue;
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t = save;
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} else
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++t;
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}
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}
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void
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usage(void)
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{
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(void)fprintf(stderr, "usage: %s [-f|-i] [-dPRrW] file ...\n",
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getprogname());
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exit(1);
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/* NOTREACHED */
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}
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