[dragonfly.git] / bin / rm / rm.c

/*-
 * Copyright (c) 1990, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * @(#) Copyright (c) 1990, 1993, 1994 The Regents of the University of California.  All rights reserved.
 * @(#)rm.c	8.5 (Berkeley) 4/18/94
 * $FreeBSD: src/bin/rm/rm.c,v 1.29.2.5 2002/07/12 07:25:48 tjr Exp $
 * $DragonFly: src/bin/rm/rm.c,v 1.10 2004/11/07 20:54:51 eirikn Exp $
 */

#include <sys/stat.h>
#include <sys/param.h>
#include <sys/mount.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <fts.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>

int dflag, eval, fflag, iflag, Pflag, vflag, Wflag, stdin_ok;
int rflag, Iflag;
uid_t uid;

static int	check(const char *, const char *, struct stat *);
static int	check2(char **);
static void	checkdot(char **);
static void	rm_file(char **);
static int	rm_overwrite(const char *, struct stat *);
static void	rm_tree(char **);
static void	usage(void);

/*
 * rm --
 *	This rm is different from historic rm's, but is expected to match
 *	POSIX 1003.2 behavior.  The most visible difference is that -f
 *	has two specific effects now, ignore non-existent files and force
 * 	file removal.
 */
int
main(int argc, char *argv[])
{
	int ch;
	char *p;

	/*
	 * Test for the special case where the utility is called as
	 * "unlink", for which the functionality provided is greatly
	 * simplified.
	 */
	if ((p = strrchr(argv[0], '/')) == NULL)
		p = argv[0];
	else
		++p;
	if (strcmp(p, "unlink") == 0) {
		while (getopt(argc, argv, "") != -1)
			usage();
		argc -= optind;
		argv += optind;
		if (argc != 1)
			usage();
		rm_file(&argv[0]);
		exit(eval);
	}

	Pflag = rflag = 0;
	while ((ch = getopt(argc, argv, "dfiIPRrvW")) != -1)
		switch(ch) {
		case 'd':
			dflag = 1;
			break;
		case 'f':
			fflag = 1;
			iflag = 0;
			break;
		case 'i':
			fflag = 0;
			iflag = 1;
			break;
		case 'I':
			Iflag = 1;
			break;
		case 'P':
			Pflag = 1;
			break;
		case 'R':
		case 'r':			/* Compatibility. */
			rflag = 1;
			break;
		case 'v':
			vflag = 1;
			break;
		case 'W':
			Wflag = 1;
			break;
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

	if (argc < 1) {
		if (fflag)
			return 0;
		usage();
	}

	checkdot(argv);
	uid = geteuid();

	if (*argv) {
		stdin_ok = isatty(STDIN_FILENO);

		if (Iflag) {
			if (check2(argv) == 0)
				exit (1);
		}
		if (rflag)
			rm_tree(argv);
		else
			rm_file(argv);
	}

	exit (eval);
}

static void
rm_tree(char **argv)
{
	FTS *fts;
	FTSENT *p;
	int needstat;
	int flags;
	int rval;

	/*
	 * Remove a file hierarchy.  If forcing removal (-f), or interactive
	 * (-i) or can't ask anyway (stdin_ok), don't stat the file.
	 */
	needstat = !uid || (!fflag && !iflag && stdin_ok);

	/*
	 * If the -i option is specified, the user can skip on the pre-order
	 * visit.  The fts_number field flags skipped directories.
	 */
#define	SKIPPED	1

	flags = FTS_PHYSICAL;
	if (!needstat)
		flags |= FTS_NOSTAT;
	if (Wflag)
		flags |= FTS_WHITEOUT;
	if (!(fts = fts_open(argv, flags, NULL)))
		err(1, NULL);
	while ((p = fts_read(fts)) != NULL) {
		switch (p->fts_info) {
		case FTS_DNR:
			if (!fflag || p->fts_errno != ENOENT) {
				warnx("%s: %s",
				    p->fts_path, strerror(p->fts_errno));
				eval = 1;
			}
			continue;
		case FTS_ERR:
			errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno));
		case FTS_NS:
		       /*
			* Assume that since fts_read() couldn't stat
			* the file, it can't be unlinked.
			*/
			if (!needstat)
				break;
			if (!fflag || p->fts_errno != ENOENT) {
				warnx("%s: %s",
				    p->fts_path, strerror(p->fts_errno));
				eval = 1;
			}
			continue;
		case FTS_D:
			/* Pre-order: give user chance to skip. */
			if (!fflag && !check(p->fts_path, p->fts_accpath,
			    p->fts_statp)) {
				fts_set(fts, p, FTS_SKIP);
				p->fts_number = SKIPPED;
			}
			else if (!uid &&
				 (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
				 !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
				 chflags(p->fts_accpath,
					 p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE)) < 0)
				goto err;
			continue;
		case FTS_DP:
			/* Post-order: see if user skipped. */
			if (p->fts_number == SKIPPED)
				continue;
			break;
		default:
			if (!fflag &&
			    !check(p->fts_path, p->fts_accpath, p->fts_statp))
				continue;
		}

		rval = 0;
		if (!uid &&
		    (p->fts_statp->st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
		    !(p->fts_statp->st_flags & (SF_APPEND|SF_IMMUTABLE)))
			rval = chflags(p->fts_accpath,
				       p->fts_statp->st_flags &= ~(UF_APPEND|UF_IMMUTABLE));
		if (rval == 0) {
			/*
			 * If we can't read or search the directory, may still be
			 * able to remove it.  Don't print out the un{read,search}able
			 * message unless the remove fails.
			 */
			switch (p->fts_info) {
			case FTS_DP:
			case FTS_DNR:
				rval = rmdir(p->fts_accpath);
				if (rval == 0 || (fflag && errno == ENOENT)) {
					if (rval == 0 && vflag)
						printf("%s\n",
						    p->fts_path);
					continue;
				}
				break;

			case FTS_W:
				rval = undelete(p->fts_accpath);
				if (rval == 0 && (fflag && errno == ENOENT)) {
					if (vflag)
						printf("%s\n",
						    p->fts_path);
					continue;
				}
				break;

			case FTS_NS:
			/*
			 * Assume that since fts_read() couldn't stat
			 * the file, it can't be unlinked.
			 */
				if (fflag)
					continue;
				/* FALLTHROUGH */
			default:
				if (Pflag)
					if (!rm_overwrite(p->fts_accpath, NULL))
						continue;
				rval = unlink(p->fts_accpath);
				if (rval == 0 || (fflag && errno == ENOENT)) {
					if (rval == 0 && vflag)
						printf("%s\n",
						    p->fts_path);
					continue;
				}
			}
		}
err:
		warn("%s", p->fts_path);
		eval = 1;
	}
	if (errno)
		err(1, "fts_read");
}

static void
rm_file(char **argv)
{
	struct stat sb;
	int rval;
	char *f;

	/*
	 * Remove a file.  POSIX 1003.2 states that, by default, attempting
	 * to remove a directory is an error, so must always stat the file.
	 */
	while ((f = *argv++) != NULL) {
		/* Assume if can't stat the file, can't unlink it. */
		if (lstat(f, &sb)) {
			if (Wflag) {
				sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR;
			} else {
				if (!fflag || errno != ENOENT) {
					warn("%s", f);
					eval = 1;
				}
				continue;
			}
		} else if (Wflag) {
			warnx("%s: %s", f, strerror(EEXIST));
			eval = 1;
			continue;
		}

		if (S_ISDIR(sb.st_mode) && !dflag) {
			warnx("%s: is a directory", f);
			eval = 1;
			continue;
		}
		if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb))
			continue;
		rval = 0;
		if (!uid &&
		    (sb.st_flags & (UF_APPEND|UF_IMMUTABLE)) &&
		    !(sb.st_flags & (SF_APPEND|SF_IMMUTABLE)))
			rval = chflags(f, sb.st_flags & ~(UF_APPEND|UF_IMMUTABLE));
		if (rval == 0) {
			if (S_ISWHT(sb.st_mode))
				rval = undelete(f);
			else if (S_ISDIR(sb.st_mode))
				rval = rmdir(f);
			else {
				if (Pflag)
					if (!rm_overwrite(f, &sb))
						continue;
				rval = unlink(f);
			}
		}
		if (rval && (!fflag || errno != ENOENT)) {
			warn("%s", f);
			eval = 1;
		}
		if (vflag && rval == 0)
			printf("%s\n", f);
	}
}

/*
 * rm_overwrite --
 *	Overwrite the file 3 times with varying bit patterns.
 *
 * XXX
 * This is a cheap way to *really* delete files.  Note that only regular
 * files are deleted, directories (and therefore names) will remain.
 * Also, this assumes a fixed-block filesystem (like FFS, or a V7 or a
 * System V filesystem).  In a logging filesystem, you'll have to have
 * kernel support.
 */
static int 
rm_overwrite(const char *file, struct stat *sbp)
{
	struct stat sb;
	struct statfs fsb;
	off_t len;
	int bsize, fd, wlen;
	char *buf = NULL;

	fd = -1;
	if (sbp == NULL) {
		if (lstat(file, &sb))
			goto err;
		sbp = &sb;
	}
	if (!S_ISREG(sbp->st_mode)) {
		warnx("%s: cannot overwrite a non-regular file", file);
		return (1);
	}
	if ((fd = open(file, O_WRONLY, 0)) == -1)
		goto err;
	if (fstatfs(fd, &fsb) == -1)
		goto err;
	bsize = MAX(fsb.f_iosize, 1024);
	if ((buf = malloc(bsize)) == NULL)
		err(1, "%s malloc failed", file);

#define	PASS(byte) {							\
	memset(buf, byte, bsize);					\
	for (len = sbp->st_size; len > 0; len -= wlen) {		\
		wlen = len < bsize ? len : bsize;			\
		if (write(fd, buf, wlen) != wlen)			\
			goto err;					\
	}								\
}
	PASS(0xff);
	if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
		goto err;
	PASS(0x00);
	if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
		goto err;
	PASS(0xff);
	if (!fsync(fd) && !close(fd)) {
		free(buf);
		return (1);
	}

err:	eval = 1;
	if (buf)
		free(buf);
	if (fd != -1)
		close(fd);
	warn("%s", file);
	return (0);
}


static int
check(const char *path, const char *name, struct stat *sp)
{
	int ch, first;
	char modep[15], *flagsp;

	/* Check -i first. */
	if (iflag)
		fprintf(stderr, "remove %s? ", path);
	else {
		/*
		 * If it's not a symbolic link and it's unwritable and we're
		 * talking to a terminal, ask.  Symbolic links are excluded
		 * because their permissions are meaningless.  Check stdin_ok
		 * first because we may not have stat'ed the file.
		 * Also skip this check if the -P option was specified because
  	         * we will not be able to overwrite file contents and will
  	         * barf later.
		 */
		if (!stdin_ok || S_ISLNK(sp->st_mode) || Pflag ||
		    (!access(name, W_OK) &&
		    !(sp->st_flags & (SF_APPEND|SF_IMMUTABLE)) &&
		    (!(sp->st_flags & (UF_APPEND|UF_IMMUTABLE)) || !uid)))
			return (1);
		strmode(sp->st_mode, modep);
		if ((flagsp = fflagstostr(sp->st_flags)) == NULL)
			err(1, NULL);
		fprintf(stderr, "override %s%s%s/%s %s%sfor %s? ",
		    modep + 1, modep[9] == ' ' ? "" : " ",
		    user_from_uid(sp->st_uid, 0),
		    group_from_gid(sp->st_gid, 0),
		    *flagsp ? flagsp : "", *flagsp ? " " : "", 
		    path);
		free(flagsp);
	}
	fflush(stderr);

	first = ch = getchar();
	while (ch != '\n' && ch != EOF)
		ch = getchar();
	return (first == 'y' || first == 'Y');
}

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)
{

	fprintf(stderr, "%s\n%s\n",
	    "usage: rm [-f | -i] [-dIPRrvW] file ...",
	    "       unlink file");
	exit(EX_USAGE);
}
Commit	Line	Data
984263bc MD	1	/*-
	2	* Copyright (c) 1990, 1993, 1994
	3	* The Regents of the University of California. All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
1de703da MD	32	*
	33	* @(#) Copyright (c) 1990, 1993, 1994 The Regents of the University of California. All rights reserved.
	34	* @(#)rm.c 8.5 (Berkeley) 4/18/94
	35	* $FreeBSD: src/bin/rm/rm.c,v 1.29.2.5 2002/07/12 07:25:48 tjr Exp $
57fed2af	36	* $DragonFly: src/bin/rm/rm.c,v 1.10 2004/11/07 20:54:51 eirikn Exp $
984263bc MD	37	*/
984263bc MD	38
984263bc MD	39	#include <sys/stat.h>
	40	#include <sys/param.h>
	41	#include <sys/mount.h>
	42
	43	#include <err.h>
	44	#include <errno.h>
	45	#include <fcntl.h>
	46	#include <fts.h>
	47	#include <stdio.h>
	48	#include <stdlib.h>
	49	#include <string.h>
	50	#include <sysexits.h>
	51	#include <unistd.h>
	52
	53	int dflag, eval, fflag, iflag, Pflag, vflag, Wflag, stdin_ok;
28242317	54	int rflag, Iflag;
984263bc MD	55	uid_t uid;
984263bc MD	56
e13bfb74 LF	57	static int check(const char , const char , struct stat *);
	58	static int check2(char **);
	59	static void checkdot(char **);
	60	static void rm_file(char **);
	61	static int rm_overwrite(const char , struct stat );
	62	static void rm_tree(char **);
	63	static void usage(void);
984263bc MD	64
	65	/*
	66	* rm --
	67	* This rm is different from historic rm's, but is expected to match
	68	* POSIX 1003.2 behavior. The most visible difference is that -f
	69	* has two specific effects now, ignore non-existent files and force
	70	* file removal.
	71	*/
	72	int
	73	main(int argc, char *argv[])
	74	{
28242317	75	int ch;
984263bc MD	76	char *p;
	77
	78	/*
	79	* Test for the special case where the utility is called as
	80	* "unlink", for which the functionality provided is greatly
	81	* simplified.
	82	*/
17b61719	83	if ((p = strrchr(argv[0], '/')) == NULL)
984263bc MD	84	p = argv[0];
	85	else
	86	++p;
	87	if (strcmp(p, "unlink") == 0) {
	88	while (getopt(argc, argv, "") != -1)
	89	usage();
	90	argc -= optind;
	91	argv += optind;
	92	if (argc != 1)
	93	usage();
	94	rm_file(&argv[0]);
	95	exit(eval);
	96	}
	97
	98	Pflag = rflag = 0;
28242317	99	while ((ch = getopt(argc, argv, "dfiIPRrvW")) != -1)
984263bc MD	100	switch(ch) {
	101	case 'd':
	102	dflag = 1;
	103	break;
	104	case 'f':
	105	fflag = 1;
	106	iflag = 0;
	107	break;
	108	case 'i':
	109	fflag = 0;
	110	iflag = 1;
	111	break;
28242317 MD	112	case 'I':
	113	Iflag = 1;
	114	break;
984263bc MD	115	case 'P':
	116	Pflag = 1;
	117	break;
	118	case 'R':
	119	case 'r': /* Compatibility. */
	120	rflag = 1;
	121	break;
	122	case 'v':
	123	vflag = 1;
	124	break;
	125	case 'W':
	126	Wflag = 1;
	127	break;
	128	default:
	129	usage();
	130	}
	131	argc -= optind;
	132	argv += optind;
	133
	134	if (argc < 1) {
	135	if (fflag)
	136	return 0;
	137	usage();
	138	}
	139
	140	checkdot(argv);
	141	uid = geteuid();
	142
	143	if (*argv) {
	144	stdin_ok = isatty(STDIN_FILENO);
	145
28242317 MD	146	if (Iflag) {
	147	if (check2(argv) == 0)
	148	exit (1);
	149	}
984263bc MD	150	if (rflag)
	151	rm_tree(argv);
	152	else
	153	rm_file(argv);
	154	}
	155
	156	exit (eval);
	157	}
	158
e13bfb74	159	static void
984263bc MD	160	rm_tree(char **argv)
	161	{
	162	FTS *fts;
	163	FTSENT *p;
	164	int needstat;
	165	int flags;
	166	int rval;
	167
	168	/*
	169	* Remove a file hierarchy. If forcing removal (-f), or interactive
	170	* (-i) or can't ask anyway (stdin_ok), don't stat the file.
	171	*/
	172	needstat = !uid \|\| (!fflag && !iflag && stdin_ok);
	173
	174	/*
	175	* If the -i option is specified, the user can skip on the pre-order
	176	* visit. The fts_number field flags skipped directories.
	177	*/
	178	#define SKIPPED 1
	179
	180	flags = FTS_PHYSICAL;
	181	if (!needstat)
	182	flags \|= FTS_NOSTAT;
	183	if (Wflag)
	184	flags \|= FTS_WHITEOUT;
	185	if (!(fts = fts_open(argv, flags, NULL)))
	186	err(1, NULL);
	187	while ((p = fts_read(fts)) != NULL) {
	188	switch (p->fts_info) {
	189	case FTS_DNR:
	190	if (!fflag \|\| p->fts_errno != ENOENT) {
	191	warnx("%s: %s",
	192	p->fts_path, strerror(p->fts_errno));
	193	eval = 1;
	194	}
	195	continue;
	196	case FTS_ERR:
	197	errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno));
	198	case FTS_NS:
e13bfb74 LF	199	/*
	200	* Assume that since fts_read() couldn't stat
	201	* the file, it can't be unlinked.
	202	*/
984263bc MD	203	if (!needstat)
	204	break;
	205	if (!fflag \|\| p->fts_errno != ENOENT) {
	206	warnx("%s: %s",
	207	p->fts_path, strerror(p->fts_errno));
	208	eval = 1;
	209	}
	210	continue;
	211	case FTS_D:
	212	/* Pre-order: give user chance to skip. */
	213	if (!fflag && !check(p->fts_path, p->fts_accpath,
	214	p->fts_statp)) {
57fed2af	215	fts_set(fts, p, FTS_SKIP);
984263bc MD	216	p->fts_number = SKIPPED;
	217	}
	218	else if (!uid &&
	219	(p->fts_statp->st_flags & (UF_APPEND\|UF_IMMUTABLE)) &&
	220	!(p->fts_statp->st_flags & (SF_APPEND\|SF_IMMUTABLE)) &&
	221	chflags(p->fts_accpath,
	222	p->fts_statp->st_flags &= ~(UF_APPEND\|UF_IMMUTABLE)) < 0)
	223	goto err;
	224	continue;
	225	case FTS_DP:
	226	/* Post-order: see if user skipped. */
	227	if (p->fts_number == SKIPPED)
	228	continue;
	229	break;
	230	default:
	231	if (!fflag &&
	232	!check(p->fts_path, p->fts_accpath, p->fts_statp))
	233	continue;
	234	}
	235
	236	rval = 0;
	237	if (!uid &&
	238	(p->fts_statp->st_flags & (UF_APPEND\|UF_IMMUTABLE)) &&
	239	!(p->fts_statp->st_flags & (SF_APPEND\|SF_IMMUTABLE)))
	240	rval = chflags(p->fts_accpath,
	241	p->fts_statp->st_flags &= ~(UF_APPEND\|UF_IMMUTABLE));
	242	if (rval == 0) {
	243	/*
	244	* If we can't read or search the directory, may still be
	245	* able to remove it. Don't print out the un{read,search}able
	246	* message unless the remove fails.
	247	*/
	248	switch (p->fts_info) {
	249	case FTS_DP:
	250	case FTS_DNR:
	251	rval = rmdir(p->fts_accpath);
	252	if (rval == 0 \|\| (fflag && errno == ENOENT)) {
	253	if (rval == 0 && vflag)
57fed2af	254	printf("%s\n",
984263bc MD	255	p->fts_path);
	256	continue;
	257	}
	258	break;
	259
	260	case FTS_W:
	261	rval = undelete(p->fts_accpath);
	262	if (rval == 0 && (fflag && errno == ENOENT)) {
	263	if (vflag)
57fed2af	264	printf("%s\n",
984263bc MD	265	p->fts_path);
	266	continue;
	267	}
	268	break;
	269
e13bfb74 LF	270	case FTS_NS:
	271	/*
	272	* Assume that since fts_read() couldn't stat
	273	* the file, it can't be unlinked.
	274	*/
	275	if (fflag)
	276	continue;
	277	/* FALLTHROUGH */
984263bc MD	278	default:
984263bc MD	279	if (Pflag)
e13bfb74 LF	280	if (!rm_overwrite(p->fts_accpath, NULL))
e13bfb74 LF	281	continue;
984263bc MD	282	rval = unlink(p->fts_accpath);
	283	if (rval == 0 \|\| (fflag && errno == ENOENT)) {
	284	if (rval == 0 && vflag)
57fed2af	285	printf("%s\n",
984263bc MD	286	p->fts_path);
	287	continue;
	288	}
	289	}
	290	}
	291	err:
	292	warn("%s", p->fts_path);
	293	eval = 1;
	294	}
	295	if (errno)
	296	err(1, "fts_read");
	297	}
	298
e13bfb74	299	static void
984263bc MD	300	rm_file(char **argv)
	301	{
	302	struct stat sb;
	303	int rval;
	304	char *f;
	305
	306	/*
	307	* Remove a file. POSIX 1003.2 states that, by default, attempting
	308	* to remove a directory is an error, so must always stat the file.
	309	*/
	310	while ((f = *argv++) != NULL) {
	311	/* Assume if can't stat the file, can't unlink it. */
	312	if (lstat(f, &sb)) {
	313	if (Wflag) {
	314	sb.st_mode = S_IFWHT\|S_IWUSR\|S_IRUSR;
	315	} else {
	316	if (!fflag \|\| errno != ENOENT) {
	317	warn("%s", f);
	318	eval = 1;
	319	}
	320	continue;
	321	}
	322	} else if (Wflag) {
	323	warnx("%s: %s", f, strerror(EEXIST));
	324	eval = 1;
	325	continue;
	326	}
	327
	328	if (S_ISDIR(sb.st_mode) && !dflag) {
	329	warnx("%s: is a directory", f);
	330	eval = 1;
	331	continue;
	332	}
	333	if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb))
	334	continue;
	335	rval = 0;
	336	if (!uid &&
	337	(sb.st_flags & (UF_APPEND\|UF_IMMUTABLE)) &&
	338	!(sb.st_flags & (SF_APPEND\|SF_IMMUTABLE)))
	339	rval = chflags(f, sb.st_flags & ~(UF_APPEND\|UF_IMMUTABLE));
	340	if (rval == 0) {
	341	if (S_ISWHT(sb.st_mode))
	342	rval = undelete(f);
	343	else if (S_ISDIR(sb.st_mode))
	344	rval = rmdir(f);
	345	else {
	346	if (Pflag)
e13bfb74 LF	347	if (!rm_overwrite(f, &sb))
e13bfb74 LF	348	continue;
984263bc MD	349	rval = unlink(f);
	350	}
	351	}
	352	if (rval && (!fflag \|\| errno != ENOENT)) {
	353	warn("%s", f);
	354	eval = 1;
	355	}
	356	if (vflag && rval == 0)
57fed2af	357	printf("%s\n", f);
984263bc MD	358	}
	359	}
	360
	361	/*
	362	* rm_overwrite --
	363	* Overwrite the file 3 times with varying bit patterns.
	364	*
	365	* XXX
	366	* This is a cheap way to really delete files. Note that only regular
	367	* files are deleted, directories (and therefore names) will remain.
	368	* Also, this assumes a fixed-block filesystem (like FFS, or a V7 or a
	369	* System V filesystem). In a logging filesystem, you'll have to have
	370	* kernel support.
	371	*/
e13bfb74 LF	372	static int
e13bfb74 LF	373	rm_overwrite(const char file, struct stat sbp)
984263bc MD	374	{
	375	struct stat sb;
	376	struct statfs fsb;
	377	off_t len;
	378	int bsize, fd, wlen;
	379	char *buf = NULL;
	380
	381	fd = -1;
	382	if (sbp == NULL) {
	383	if (lstat(file, &sb))
	384	goto err;
	385	sbp = &sb;
	386	}
e13bfb74 LF	387	if (!S_ISREG(sbp->st_mode)) {
	388	warnx("%s: cannot overwrite a non-regular file", file);
	389	return (1);
	390	}
984263bc MD	391	if ((fd = open(file, O_WRONLY, 0)) == -1)
	392	goto err;
	393	if (fstatfs(fd, &fsb) == -1)
	394	goto err;
	395	bsize = MAX(fsb.f_iosize, 1024);
	396	if ((buf = malloc(bsize)) == NULL)
e13bfb74	397	err(1, "%s malloc failed", file);
984263bc MD	398
	399	#define PASS(byte) { \
	400	memset(buf, byte, bsize); \
	401	for (len = sbp->st_size; len > 0; len -= wlen) { \
	402	wlen = len < bsize ? len : bsize; \
	403	if (write(fd, buf, wlen) != wlen) \
	404	goto err; \
	405	} \
	406	}
	407	PASS(0xff);
	408	if (fsync(fd) \|\| lseek(fd, (off_t)0, SEEK_SET))
	409	goto err;
	410	PASS(0x00);
	411	if (fsync(fd) \|\| lseek(fd, (off_t)0, SEEK_SET))
	412	goto err;
	413	PASS(0xff);
	414	if (!fsync(fd) && !close(fd)) {
	415	free(buf);
e13bfb74	416	return (1);
984263bc MD	417	}
	418
	419	err: eval = 1;
	420	if (buf)
	421	free(buf);
e13bfb74 LF	422	if (fd != -1)
e13bfb74 LF	423	close(fd);
984263bc	424	warn("%s", file);
e13bfb74	425	return (0);
984263bc MD	426	}
	427
	428
e13bfb74 LF	429	static int
e13bfb74 LF	430	check(const char path, const char name, struct stat *sp)
984263bc MD	431	{
	432	int ch, first;
	433	char modep[15], *flagsp;
	434
	435	/* Check -i first. */
	436	if (iflag)
57fed2af	437	fprintf(stderr, "remove %s? ", path);
984263bc MD	438	else {
	439	/*
	440	* If it's not a symbolic link and it's unwritable and we're
	441	* talking to a terminal, ask. Symbolic links are excluded
	442	* because their permissions are meaningless. Check stdin_ok
	443	* first because we may not have stat'ed the file.
e13bfb74 LF	444	* Also skip this check if the -P option was specified because
	445	* we will not be able to overwrite file contents and will
	446	* barf later.
984263bc	447	*/
e13bfb74	448	if (!stdin_ok \|\| S_ISLNK(sp->st_mode) \|\| Pflag \|\|
984263bc MD	449	(!access(name, W_OK) &&
	450	!(sp->st_flags & (SF_APPEND\|SF_IMMUTABLE)) &&
	451	(!(sp->st_flags & (UF_APPEND\|UF_IMMUTABLE)) \|\| !uid)))
	452	return (1);
	453	strmode(sp->st_mode, modep);
	454	if ((flagsp = fflagstostr(sp->st_flags)) == NULL)
	455	err(1, NULL);
57fed2af	456	fprintf(stderr, "override %s%s%s/%s %s%sfor %s? ",
984263bc MD	457	modep + 1, modep[9] == ' ' ? "" : " ",
	458	user_from_uid(sp->st_uid, 0),
	459	group_from_gid(sp->st_gid, 0),
	460	flagsp ? flagsp : "", flagsp ? " " : "",
	461	path);
	462	free(flagsp);
	463	}
57fed2af	464	fflush(stderr);
984263bc MD	465
	466	first = ch = getchar();
	467	while (ch != '\n' && ch != EOF)
	468	ch = getchar();
	469	return (first == 'y' \|\| first == 'Y');
	470	}
	471
e13bfb74	472	static int
28242317 MD	473	check2(char **argv)
	474	{
	475	struct stat st;
	476	int first;
	477	int ch;
	478	int fcount = 0;
	479	int dcount = 0;
	480	int i;
	481	const char *dname = NULL;
	482
	483	for (i = 0; argv[i]; ++i) {
	484	if (lstat(argv[i], &st) == 0) {
	485	if (S_ISDIR(st.st_mode)) {
	486	++dcount;
	487	dname = argv[i]; /* only used if 1 dir */
	488	} else {
	489	++fcount;
	490	}
	491	}
	492	}
	493	first = 0;
	494	while (first != 'n' && first != 'N' && first != 'y' && first != 'Y') {
	495	if (dcount && rflag) {
	496	fprintf(stderr, "recursively remove");
	497	if (dcount == 1)
	498	fprintf(stderr, " %s", dname);
	499	else
	500	fprintf(stderr, " %d dirs", dcount);
	501	if (fcount == 1)
	502	fprintf(stderr, " and 1 file");
	503	else if (fcount > 1)
	504	fprintf(stderr, " and %d files", fcount);
	505	} else if (dcount + fcount > 3) {
	506	fprintf(stderr, "remove %d files", dcount + fcount);
	507	} else {
	508	return(1);
	509	}
	510	fprintf(stderr, "? ");
	511	fflush(stderr);
	512
	513	first = ch = getchar();
	514	while (ch != '\n' && ch != EOF)
	515	ch = getchar();
982099ef MD	516	if (ch == EOF)
982099ef MD	517	break;
28242317 MD	518	}
	519	return (first == 'y' \|\| first == 'Y');
	520	}
	521
984263bc	522	#define ISDOT(a) ((a)[0] == '.' && (!(a)[1] \|\| ((a)[1] == '.' && !(a)[2])))
e13bfb74	523	static void
984263bc MD	524	checkdot(char **argv)
	525	{
	526	char p, save, *t;
	527	int complained;
	528
	529	complained = 0;
	530	for (t = argv; *t;) {
	531	if ((p = strrchr(*t, '/')) != NULL)
	532	++p;
	533	else
	534	p = *t;
	535	if (ISDOT(p)) {
	536	if (!complained++)
	537	warnx("\".\" and \"..\" may not be removed");
	538	eval = 1;
	539	for (save = t; (t[0] = t[1]) != NULL; ++t)
	540	continue;
	541	t = save;
	542	} else
	543	++t;
	544	}
	545	}
	546
e13bfb74	547	static void
984263bc MD	548	usage(void)
	549	{
	550
57fed2af	551	fprintf(stderr, "%s\n%s\n",
4d996822	552	"usage: rm [-f \| -i] [-dIPRrvW] file ...",
984263bc MD	553	" unlink file");
	554	exit(EX_USAGE);
	555	}