643 lines
14 KiB
C
643 lines
14 KiB
C
/*-
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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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* 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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#if 0
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#ifndef lint
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static const char copyright[] =
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"@(#) 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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static char sccsid[] = "@(#)rm.c 8.5 (Berkeley) 4/18/94";
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#endif /* not lint */
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/stat.h>
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#include <sys/param.h>
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#include <sys/mount.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 <stdint.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 <sysexits.h>
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#include <unistd.h>
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static int dflag, eval, fflag, iflag, Pflag, vflag, Wflag, stdin_ok;
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static int rflag, Iflag, xflag;
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static uid_t uid;
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static volatile sig_atomic_t info;
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static int check(const char *, const char *, struct stat *);
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static int check2(char **);
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static void checkdot(char **);
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static void checkslash(char **);
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static void rm_file(char **);
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static int rm_overwrite(const char *, struct stat *);
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static void rm_tree(char **);
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static void siginfo(int __unused);
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static void usage(void);
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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;
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char *p;
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/*
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* Test for the special case where the utility is called as
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* "unlink", for which the functionality provided is greatly
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* simplified.
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*/
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if ((p = strrchr(argv[0], '/')) == NULL)
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p = argv[0];
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else
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++p;
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if (strcmp(p, "unlink") == 0) {
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while (getopt(argc, argv, "") != -1)
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usage();
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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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rm_file(&argv[0]);
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exit(eval);
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}
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Pflag = rflag = xflag = 0;
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while ((ch = getopt(argc, argv, "dfiIPRrvWx")) != -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 'I':
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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 'v':
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vflag = 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 'x':
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xflag = 1;
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break;
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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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if (fflag)
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return (0);
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usage();
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}
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checkdot(argv);
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if (getenv("POSIXLY_CORRECT") == NULL)
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checkslash(argv);
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uid = geteuid();
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(void)signal(SIGINFO, siginfo);
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if (*argv) {
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stdin_ok = isatty(STDIN_FILENO);
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if (Iflag) {
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if (check2(argv) == 0)
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exit (1);
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}
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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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}
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static 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 needstat;
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int flags;
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int rval;
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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 = !uid || (!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 (xflag)
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flags |= FTS_XDEV;
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if (!(fts = fts_open(argv, flags, NULL))) {
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if (fflag && errno == ENOENT)
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return;
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err(1, "fts_open");
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}
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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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case FTS_NS:
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/*
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* Assume that since fts_read() couldn't stat the
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* file, it can't be unlinked.
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*/
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if (!needstat)
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break;
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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_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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else if (!uid &&
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(p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
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!(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
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lchflags(p->fts_accpath,
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p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)) < 0)
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goto err;
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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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rval = 0;
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if (!uid &&
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(p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
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!(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)))
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rval = lchflags(p->fts_accpath,
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p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE));
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if (rval == 0) {
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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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rval = rmdir(p->fts_accpath);
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if (rval == 0 || (fflag && errno == ENOENT)) {
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if (rval == 0 && vflag)
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(void)printf("%s\n",
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p->fts_path);
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if (rval == 0 && info) {
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info = 0;
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(void)printf("%s\n",
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p->fts_path);
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}
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continue;
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}
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break;
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case FTS_W:
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rval = undelete(p->fts_accpath);
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if (rval == 0 && (fflag && errno == ENOENT)) {
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if (vflag)
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(void)printf("%s\n",
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p->fts_path);
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if (info) {
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info = 0;
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(void)printf("%s\n",
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p->fts_path);
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}
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continue;
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}
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break;
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case FTS_NS:
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/*
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* Assume that since fts_read() couldn't stat
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* the file, it can't be unlinked.
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*/
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if (fflag)
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continue;
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/* FALLTHROUGH */
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case FTS_F:
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case FTS_NSOK:
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if (Pflag)
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if (!rm_overwrite(p->fts_accpath, p->fts_info ==
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FTS_NSOK ? NULL : p->fts_statp))
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continue;
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/* FALLTHROUGH */
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default:
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rval = unlink(p->fts_accpath);
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if (rval == 0 || (fflag && errno == ENOENT)) {
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if (rval == 0 && vflag)
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(void)printf("%s\n",
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p->fts_path);
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if (rval == 0 && info) {
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info = 0;
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(void)printf("%s\n",
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p->fts_path);
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}
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continue;
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}
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}
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}
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err:
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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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fts_close(fts);
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}
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static 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 || errno != ENOENT) {
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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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rval = 0;
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if (!uid && !S_ISWHT(sb.st_mode) &&
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(sb.st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
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!(sb.st_flags & (SF_APPEND|SF_IMMUTABLE)))
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rval = lchflags(f, sb.st_flags & ~(UF_APPEND|UF_IMMUTABLE));
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if (rval == 0) {
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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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if (!rm_overwrite(f, &sb))
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continue;
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rval = unlink(f);
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}
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}
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if (rval && (!fflag || errno != ENOENT)) {
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warn("%s", f);
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eval = 1;
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}
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if (vflag && rval == 0)
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(void)printf("%s\n", f);
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if (info && rval == 0) {
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info = 0;
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(void)printf("%s\n", f);
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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 or COW file system, you'll have to
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* have kernel support.
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*/
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static int
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rm_overwrite(const char *file, struct stat *sbp)
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{
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struct stat sb, sb2;
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struct statfs fsb;
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off_t len;
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int bsize, fd, wlen;
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char *buf = NULL;
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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 (1);
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if (sbp->st_nlink > 1 && !fflag) {
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warnx("%s (inode %ju): not overwritten due to multiple links",
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file, (uintmax_t)sbp->st_ino);
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return (0);
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}
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if ((fd = open(file, O_WRONLY|O_NONBLOCK|O_NOFOLLOW, 0)) == -1)
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goto err;
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if (fstat(fd, &sb2))
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goto err;
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if (sb2.st_dev != sbp->st_dev || sb2.st_ino != sbp->st_ino ||
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!S_ISREG(sb2.st_mode)) {
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errno = EPERM;
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goto err;
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}
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if (fstatfs(fd, &fsb) == -1)
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goto err;
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bsize = MAX(fsb.f_iosize, 1024);
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if ((buf = malloc(bsize)) == NULL)
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err(1, "%s: malloc", file);
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#define PASS(byte) { \
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memset(buf, byte, bsize); \
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for (len = sbp->st_size; len > 0; len -= wlen) { \
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wlen = len < bsize ? len : bsize; \
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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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free(buf);
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return (1);
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}
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err: eval = 1;
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if (buf)
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free(buf);
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if (fd != -1)
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close(fd);
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warn("%s", file);
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return (0);
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}
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static int
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check(const char *path, const char *name, struct stat *sp)
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{
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int ch, first;
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char modep[15], *flagsp;
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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) &&
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!(sp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
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(!(sp->st_flags & (UF_APPEND|UF_IMMUTABLE)) || !uid)))
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return (1);
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strmode(sp->st_mode, modep);
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if ((flagsp = fflagstostr(sp->st_flags)) == NULL)
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err(1, "fflagstostr");
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if (Pflag)
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errx(1,
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"%s: -P was specified, but file is not writable",
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path);
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(void)fprintf(stderr, "override %s%s%s/%s %s%sfor %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),
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*flagsp ? flagsp : "", *flagsp ? " " : "",
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path);
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free(flagsp);
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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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#define ISSLASH(a) ((a)[0] == '/' && (a)[1] == '\0')
|
|
static void
|
|
checkslash(char **argv)
|
|
{
|
|
char **t, **u;
|
|
int complained;
|
|
|
|
complained = 0;
|
|
for (t = argv; *t;) {
|
|
if (ISSLASH(*t)) {
|
|
if (!complained++)
|
|
warnx("\"/\" may not be removed");
|
|
eval = 1;
|
|
for (u = t; u[0] != NULL; ++u)
|
|
u[0] = u[1];
|
|
} else {
|
|
++t;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int
|
|
check2(char **argv)
|
|
{
|
|
struct stat st;
|
|
int first;
|
|
int ch;
|
|
int fcount = 0;
|
|
int dcount = 0;
|
|
int i;
|
|
const char *dname = NULL;
|
|
|
|
for (i = 0; argv[i]; ++i) {
|
|
if (lstat(argv[i], &st) == 0) {
|
|
if (S_ISDIR(st.st_mode)) {
|
|
++dcount;
|
|
dname = argv[i]; /* only used if 1 dir */
|
|
} else {
|
|
++fcount;
|
|
}
|
|
}
|
|
}
|
|
first = 0;
|
|
while (first != 'n' && first != 'N' && first != 'y' && first != 'Y') {
|
|
if (dcount && rflag) {
|
|
fprintf(stderr, "recursively remove");
|
|
if (dcount == 1)
|
|
fprintf(stderr, " %s", dname);
|
|
else
|
|
fprintf(stderr, " %d dirs", dcount);
|
|
if (fcount == 1)
|
|
fprintf(stderr, " and 1 file");
|
|
else if (fcount > 1)
|
|
fprintf(stderr, " and %d files", fcount);
|
|
} else if (dcount + fcount > 3) {
|
|
fprintf(stderr, "remove %d files", dcount + fcount);
|
|
} else {
|
|
return(1);
|
|
}
|
|
fprintf(stderr, "? ");
|
|
fflush(stderr);
|
|
|
|
first = ch = getchar();
|
|
while (ch != '\n' && ch != EOF)
|
|
ch = getchar();
|
|
if (ch == EOF)
|
|
break;
|
|
}
|
|
return (first == 'y' || first == 'Y');
|
|
}
|
|
|
|
#define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2])))
|
|
static void
|
|
checkdot(char **argv)
|
|
{
|
|
char *p, **save, **t;
|
|
int complained;
|
|
|
|
complained = 0;
|
|
for (t = argv; *t;) {
|
|
if ((p = strrchr(*t, '/')) != NULL)
|
|
++p;
|
|
else
|
|
p = *t;
|
|
if (ISDOT(p)) {
|
|
if (!complained++)
|
|
warnx("\".\" and \"..\" may not be removed");
|
|
eval = 1;
|
|
for (save = t; (t[0] = t[1]) != NULL; ++t)
|
|
continue;
|
|
t = save;
|
|
} else
|
|
++t;
|
|
}
|
|
}
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
|
|
(void)fprintf(stderr, "%s\n%s\n",
|
|
"usage: rm [-f | -i] [-dIPRrvWx] file ...",
|
|
" unlink file");
|
|
exit(EX_USAGE);
|
|
}
|
|
|
|
static void
|
|
siginfo(int sig __unused)
|
|
{
|
|
|
|
info = 1;
|
|
}
|