1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1989, 1993, 1994
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#if 0
33#ifndef lint
34static char const copyright[] =
35"@(#) Copyright (c) 1989, 1993, 1994\n\
36	The Regents of the University of California.  All rights reserved.\n";
37#endif /* not lint */
38
39#ifndef lint
40static char sccsid[] = "@(#)chmod.c	8.8 (Berkeley) 4/1/94";
41#endif /* not lint */
42#endif
43#include <sys/cdefs.h>
44__FBSDID("$FreeBSD$");
45
46#include <sys/param.h>
47#include <sys/stat.h>
48
49#include <err.h>
50#include <errno.h>
51#include <fcntl.h>
52#include <fts.h>
53#include <limits.h>
54#include <signal.h>
55#include <stdio.h>
56#include <stdlib.h>
57#include <string.h>
58#include <unistd.h>
59
60static volatile sig_atomic_t siginfo;
61
62static void usage(void);
63static int may_have_nfs4acl(const FTSENT *ent, int hflag);
64
65static void
66siginfo_handler(int sig __unused)
67{
68
69	siginfo = 1;
70}
71
72int
73main(int argc, char *argv[])
74{
75	FTS *ftsp;
76	FTSENT *p;
77	mode_t *set;
78	int Hflag, Lflag, Rflag, ch, fflag, fts_options, hflag, rval;
79	int vflag;
80	char *mode;
81	mode_t newmode;
82
83	set = NULL;
84	Hflag = Lflag = Rflag = fflag = hflag = vflag = 0;
85	while ((ch = getopt(argc, argv, "HLPRXfghorstuvwx")) != -1)
86		switch (ch) {
87		case 'H':
88			Hflag = 1;
89			Lflag = 0;
90			break;
91		case 'L':
92			Lflag = 1;
93			Hflag = 0;
94			break;
95		case 'P':
96			Hflag = Lflag = 0;
97			break;
98		case 'R':
99			Rflag = 1;
100			break;
101		case 'f':
102			fflag = 1;
103			break;
104		case 'h':
105			/*
106			 * In System V the -h option causes chmod to change
107			 * the mode of the symbolic link. 4.4BSD's symbolic
108			 * links didn't have modes, so it was an undocumented
109			 * noop.  In FreeBSD 3.0, lchmod(2) is introduced and
110			 * this option does real work.
111			 */
112			hflag = 1;
113			break;
114		/*
115		 * XXX
116		 * "-[rwx]" are valid mode commands.  If they are the entire
117		 * argument, getopt has moved past them, so decrement optind.
118		 * Regardless, we're done argument processing.
119		 */
120		case 'g': case 'o': case 'r': case 's':
121		case 't': case 'u': case 'w': case 'X': case 'x':
122			if (argv[optind - 1][0] == '-' &&
123			    argv[optind - 1][1] == ch &&
124			    argv[optind - 1][2] == '\0')
125				--optind;
126			goto done;
127		case 'v':
128			vflag++;
129			break;
130		case '?':
131		default:
132			usage();
133		}
134done:	argv += optind;
135	argc -= optind;
136
137	if (argc < 2)
138		usage();
139
140	(void)signal(SIGINFO, siginfo_handler);
141
142	if (Rflag) {
143		if (hflag)
144			errx(1, "the -R and -h options may not be "
145			    "specified together.");
146		if (Lflag) {
147			fts_options = FTS_LOGICAL;
148		} else {
149			fts_options = FTS_PHYSICAL;
150
151			if (Hflag) {
152				fts_options |= FTS_COMFOLLOW;
153			}
154		}
155	} else if (hflag) {
156		fts_options = FTS_PHYSICAL;
157	} else {
158		fts_options = FTS_LOGICAL;
159	}
160
161	mode = *argv;
162	if ((set = setmode(mode)) == NULL)
163		errx(1, "invalid file mode: %s", mode);
164
165	if ((ftsp = fts_open(++argv, fts_options, 0)) == NULL)
166		err(1, "fts_open");
167	for (rval = 0; errno = 0, (p = fts_read(ftsp)) != NULL;) {
168		int atflag;
169
170		if ((fts_options & FTS_LOGICAL) ||
171		    ((fts_options & FTS_COMFOLLOW) &&
172		    p->fts_level == FTS_ROOTLEVEL))
173			atflag = 0;
174		else
175			atflag = AT_SYMLINK_NOFOLLOW;
176
177		switch (p->fts_info) {
178		case FTS_D:
179			if (!Rflag)
180				fts_set(ftsp, p, FTS_SKIP);
181			break;
182		case FTS_DNR:			/* Warn, chmod. */
183			warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
184			rval = 1;
185			break;
186		case FTS_DP:			/* Already changed at FTS_D. */
187			continue;
188		case FTS_ERR:			/* Warn, continue. */
189		case FTS_NS:
190			warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
191			rval = 1;
192			continue;
193		default:
194			break;
195		}
196		newmode = getmode(set, p->fts_statp->st_mode);
197		/*
198		 * With NFSv4 ACLs, it is possible that applying a mode
199		 * identical to the one computed from an ACL will change
200		 * that ACL.
201		 */
202		if (may_have_nfs4acl(p, hflag) == 0 &&
203		    (newmode & ALLPERMS) == (p->fts_statp->st_mode & ALLPERMS))
204				continue;
205		if (fchmodat(AT_FDCWD, p->fts_accpath, newmode, atflag) == -1
206		    && !fflag) {
207			warn("%s", p->fts_path);
208			rval = 1;
209		} else if (vflag || siginfo) {
210			(void)printf("%s", p->fts_path);
211
212			if (vflag > 1 || siginfo) {
213				char m1[12], m2[12];
214
215				strmode(p->fts_statp->st_mode, m1);
216				strmode((p->fts_statp->st_mode &
217				    S_IFMT) | newmode, m2);
218				(void)printf(": 0%o [%s] -> 0%o [%s]",
219				    p->fts_statp->st_mode, m1,
220				    (p->fts_statp->st_mode & S_IFMT) |
221				    newmode, m2);
222			}
223			(void)printf("\n");
224			siginfo = 0;
225		}
226	}
227	if (errno)
228		err(1, "fts_read");
229	exit(rval);
230}
231
232static void
233usage(void)
234{
235	(void)fprintf(stderr,
236	    "usage: chmod [-fhv] [-R [-H | -L | -P]] mode file ...\n");
237	exit(1);
238}
239
240static int
241may_have_nfs4acl(const FTSENT *ent, int hflag)
242{
243	int ret;
244	static dev_t previous_dev = NODEV;
245	static int supports_acls = -1;
246
247	if (previous_dev != ent->fts_statp->st_dev) {
248		previous_dev = ent->fts_statp->st_dev;
249		supports_acls = 0;
250
251		if (hflag)
252			ret = lpathconf(ent->fts_accpath, _PC_ACL_NFS4);
253		else
254			ret = pathconf(ent->fts_accpath, _PC_ACL_NFS4);
255		if (ret > 0)
256			supports_acls = 1;
257		else if (ret < 0 && errno != EINVAL)
258			warn("%s", ent->fts_path);
259	}
260
261	return (supports_acls);
262}
263