rm.c revision 1.9 
1/*	$OpenBSD: rm.c,v 1.9 2016/10/10 18:09:40 tedu Exp $	*/
2/*	$NetBSD: rm.c,v 1.19 1995/09/07 06:48:50 jtc Exp $	*/
3
4/*-
5 * Copyright (c) 1990, 1993, 1994
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#include <sys/types.h>
34#include <sys/stat.h>
35#include <sys/mount.h>
36
37#include <err.h>
38#include <errno.h>
39#include <fcntl.h>
40#include <fts.h>
41#include <stdio.h>
42#include <stdlib.h>
43#include <string.h>
44#include <unistd.h>
45#include <limits.h>
46#include <pwd.h>
47#include <grp.h>
48
49static int eval;
50
51static void	checkdot(char **);
52static void	rm_tree(char **);
53
54int
55rmmain(int argc, char *argv[])
56{
57
58	checkdot(argv);
59
60	if (*argv)
61		rm_tree(argv);
62
63	return (eval);
64}
65
66static void
67rm_tree(char **argv)
68{
69	FTS *fts;
70	FTSENT *p;
71	int flags;
72
73	/*
74	 * If the -i option is specified, the user can skip on the pre-order
75	 * visit.  The fts_number field flags skipped directories.
76	 */
77#define	SKIPPED	1
78
79	flags = FTS_PHYSICAL;
80	flags |= FTS_NOSTAT;
81	if (!(fts = fts_open(argv, flags, NULL)))
82		err(1, NULL);
83	while ((p = fts_read(fts)) != NULL) {
84		switch (p->fts_info) {
85		case FTS_DNR:
86			if (p->fts_errno != ENOENT) {
87				warnx("%s: %s",
88				    p->fts_path, strerror(p->fts_errno));
89				eval = 1;
90			}
91			continue;
92		case FTS_ERR:
93			errc(1, p->fts_errno, "%s", p->fts_path);
94		case FTS_NS:
95			/*
96			 * FTS_NS: assume that if can't stat the file, it
97			 * can't be unlinked.
98			 */
99			break;
100		case FTS_D:
101			/* Pre-order: give user chance to skip. */
102			continue;
103		case FTS_DP:
104			/* Post-order: see if user skipped. */
105			if (p->fts_number == SKIPPED)
106				continue;
107			break;
108		default:
109			break;
110		}
111
112		/*
113		 * If we can't read or search the directory, may still be
114		 * able to remove it.  Don't print out the un{read,search}able
115		 * message unless the remove fails.
116		 */
117		switch (p->fts_info) {
118		case FTS_DP:
119		case FTS_DNR:
120			if (!rmdir(p->fts_accpath) ||
121			    (errno == ENOENT))
122				continue;
123			break;
124
125		case FTS_F:
126		case FTS_NSOK:
127		default:
128			if (!unlink(p->fts_accpath) ||
129			    (errno == ENOENT))
130				continue;
131		}
132		warn("%s", p->fts_path);
133		eval = 1;
134	}
135	if (errno)
136		err(1, "fts_read");
137	fts_close(fts);
138}
139
140/*
141 * POSIX.2 requires that if "." or ".." are specified as the basename
142 * portion of an operand, a diagnostic message be written to standard
143 * error and nothing more be done with such operands.
144 *
145 * Since POSIX.2 defines basename as the final portion of a path after
146 * trailing slashes have been removed, we'll remove them here.
147 */
148#define ISDOT(a)	((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2])))
149static void
150checkdot(char **argv)
151{
152	char *p, **save, **t;
153	int complained;
154
155	complained = 0;
156	for (t = argv; *t;) {
157		/* strip trailing slashes */
158		p = strrchr (*t, '\0');
159		while (--p > *t && *p == '/')
160			*p = '\0';
161
162		/* extract basename */
163		if ((p = strrchr(*t, '/')) != NULL)
164			++p;
165		else
166			p = *t;
167
168		if (ISDOT(p)) {
169			if (!complained++)
170				warnx("\".\" and \"..\" may not be removed");
171			eval = 1;
172			for (save = t; (t[0] = t[1]) != NULL; ++t)
173				continue;
174			t = save;
175		} else
176			++t;
177	}
178}
179