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
34 static 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
40 static 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
60 static volatile sig_atomic_t siginfo;
61
62 static void usage(void);
63 static int may_have_nfs4acl(const FTSENT *ent, int hflag);
64
65 static void
siginfo_handler(int sig __unused)66 siginfo_handler(int sig __unused)
67 {
68
69 siginfo = 1;
70 }
71
72 int
main(int argc,char * argv[])73 main(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 }
134 done: 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
232 static void
usage(void)233 usage(void)
234 {
235 (void)fprintf(stderr,
236 "usage: chmod [-fhv] [-R [-H | -L | -P]] mode file ...\n");
237 exit(1);
238 }
239
240 static int
may_have_nfs4acl(const FTSENT * ent,int hflag)241 may_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