3f91ab9262
occurrences of "/" in the argument list. This corresponds to Enhancement Request Number 5 in the Austin Group TC2 Aardvark's XCU Defects Report (<URL:http://www.opengroup.org/austin/aardvark/finaltext/xcubug.txt>). Further discussion is available in the Austin Group mailing list archives (<URL:http://www.opengroup.org/austin/mailarchives/>, "Defect in XCU rm") and for Austin Group members, in the Austin Group Interpretations archive (<URL:http://www.opengroup.org/austin/interps/>, AI-019) This commit makes that check conditional on !POSIXLY_CORRECT, since it is not strictly correct according to the current version of the standard (but is expected to be correct according to the next version, and has already been adopted by Solaris).
526 lines
12 KiB
C
526 lines
12 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 <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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int dflag, eval, fflag, iflag, Pflag, vflag, Wflag, stdin_ok;
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uid_t uid;
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int check(char *, char *, struct stat *);
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void checkdot(char **);
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void checkslash(char **);
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void rm_file(char **);
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int rm_overwrite(char *, struct stat *);
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void rm_tree(char **);
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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, rflag;
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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 = rindex(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 = 0;
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while ((ch = getopt(argc, argv, "dfiPRrvW")) != -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 '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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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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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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}
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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 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 (!(fts = fts_open(argv, flags, NULL)))
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err(1, "fts_open");
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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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chflags(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 = chflags(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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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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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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default:
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if (Pflag)
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if (!rm_overwrite(p->fts_accpath, NULL))
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continue;
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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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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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}
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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 || 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 &&
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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 = chflags(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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}
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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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int
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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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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 ((fd = open(file, O_WRONLY, 0)) == -1)
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goto err;
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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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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], *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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* Also skip this check if the -P option was specified because
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* we will not be able to overwrite file contents and will
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* barf later.
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*/
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if (!stdin_ok || S_ISLNK(sp->st_mode) || Pflag ||
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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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|
(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')
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|
void
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checkslash(char **argv)
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|
{
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|
char **t, **u;
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|
int complained;
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|
complained = 0;
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|
for (t = argv; *t;) {
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|
if (ISSLASH(*t)) {
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|
if (!complained++)
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|
warnx("\"/\" may not be removed");
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|
eval = 1;
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|
for (u = t; u[0] != NULL; ++u)
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|
u[0] = u[1];
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|
} else {
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|
++t;
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|
}
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|
}
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|
}
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|
#define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2])))
|
|
void
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|
checkdot(char **argv)
|
|
{
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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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|
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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|
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|
(void)fprintf(stderr, "%s\n%s\n",
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|
"usage: rm [-f | -i] [-dPRrvW] file ...",
|
|
" unlink file");
|
|
exit(EX_USAGE);
|
|
}
|