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 #include <sys/param.h>
33 #include <sys/stat.h>
34
35 #include <err.h>
36 #include <errno.h>
37 #include <fcntl.h>
38 #include <fts.h>
39 #include <limits.h>
40 #include <signal.h>
41 #include <stdio.h>
42 #include <stdlib.h>
43 #include <string.h>
44 #include <unistd.h>
45
46 static volatile sig_atomic_t siginfo;
47
48 static void usage(void) __dead2;
49 static int may_have_nfs4acl(const FTSENT *ent, int hflag);
50
51 static void
siginfo_handler(int sig __unused)52 siginfo_handler(int sig __unused)
53 {
54
55 siginfo = 1;
56 }
57
58 int
main(int argc,char * argv[])59 main(int argc, char *argv[])
60 {
61 FTS *ftsp;
62 FTSENT *p;
63 mode_t *set;
64 int Hflag, Lflag, Rflag, ch, fflag, fts_options, hflag, rval;
65 int vflag;
66 char *mode;
67 mode_t newmode;
68
69 set = NULL;
70 Hflag = Lflag = Rflag = fflag = hflag = vflag = 0;
71 while ((ch = getopt(argc, argv, "HLPRXfghorstuvwx")) != -1)
72 switch (ch) {
73 case 'H':
74 Hflag = 1;
75 Lflag = 0;
76 break;
77 case 'L':
78 Lflag = 1;
79 Hflag = 0;
80 break;
81 case 'P':
82 Hflag = Lflag = 0;
83 break;
84 case 'R':
85 Rflag = 1;
86 break;
87 case 'f':
88 fflag = 1;
89 break;
90 case 'h':
91 /*
92 * In System V the -h option causes chmod to change
93 * the mode of the symbolic link. 4.4BSD's symbolic
94 * links didn't have modes, so it was an undocumented
95 * noop. In FreeBSD 3.0, lchmod(2) is introduced and
96 * this option does real work.
97 */
98 hflag = 1;
99 break;
100 /*
101 * XXX
102 * "-[rwx]" are valid mode commands. If they are the entire
103 * argument, getopt has moved past them, so decrement optind.
104 * Regardless, we're done argument processing.
105 */
106 case 'g': case 'o': case 'r': case 's':
107 case 't': case 'u': case 'w': case 'X': case 'x':
108 if (argv[optind - 1][0] == '-' &&
109 argv[optind - 1][1] == ch &&
110 argv[optind - 1][2] == '\0')
111 --optind;
112 goto done;
113 case 'v':
114 vflag++;
115 break;
116 case '?':
117 default:
118 usage();
119 }
120 done: argv += optind;
121 argc -= optind;
122
123 if (argc < 2)
124 usage();
125
126 (void)signal(SIGINFO, siginfo_handler);
127
128 if (Rflag) {
129 if (hflag)
130 errx(1, "the -R and -h options may not be "
131 "specified together.");
132 if (Lflag) {
133 fts_options = FTS_LOGICAL;
134 } else {
135 fts_options = FTS_PHYSICAL;
136
137 if (Hflag) {
138 fts_options |= FTS_COMFOLLOW;
139 }
140 }
141 } else if (hflag) {
142 fts_options = FTS_PHYSICAL;
143 } else {
144 fts_options = FTS_LOGICAL;
145 }
146
147 mode = *argv;
148 if ((set = setmode(mode)) == NULL)
149 errx(1, "invalid file mode: %s", mode);
150
151 if ((ftsp = fts_open(++argv, fts_options, 0)) == NULL)
152 err(1, "fts_open");
153 for (rval = 0; errno = 0, (p = fts_read(ftsp)) != NULL;) {
154 int atflag;
155
156 if ((fts_options & FTS_LOGICAL) ||
157 ((fts_options & FTS_COMFOLLOW) &&
158 p->fts_level == FTS_ROOTLEVEL))
159 atflag = 0;
160 else
161 atflag = AT_SYMLINK_NOFOLLOW;
162
163 switch (p->fts_info) {
164 case FTS_D:
165 if (!Rflag)
166 fts_set(ftsp, p, FTS_SKIP);
167 break;
168 case FTS_DNR: /* Warn, chmod. */
169 warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
170 rval = 1;
171 break;
172 case FTS_DP: /* Already changed at FTS_D. */
173 continue;
174 case FTS_ERR: /* Warn, continue. */
175 case FTS_NS:
176 warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
177 rval = 1;
178 continue;
179 default:
180 break;
181 }
182 newmode = getmode(set, p->fts_statp->st_mode);
183 /*
184 * With NFSv4 ACLs, it is possible that applying a mode
185 * identical to the one computed from an ACL will change
186 * that ACL.
187 */
188 if (may_have_nfs4acl(p, hflag) == 0 &&
189 (newmode & ALLPERMS) == (p->fts_statp->st_mode & ALLPERMS))
190 continue;
191 if (fchmodat(AT_FDCWD, p->fts_accpath, newmode, atflag) == -1
192 && !fflag) {
193 warn("%s", p->fts_path);
194 rval = 1;
195 } else if (vflag || siginfo) {
196 (void)printf("%s", p->fts_path);
197
198 if (vflag > 1 || siginfo) {
199 char m1[12], m2[12];
200
201 strmode(p->fts_statp->st_mode, m1);
202 strmode((p->fts_statp->st_mode &
203 S_IFMT) | newmode, m2);
204 (void)printf(": 0%o [%s] -> 0%o [%s]",
205 p->fts_statp->st_mode, m1,
206 (p->fts_statp->st_mode & S_IFMT) |
207 newmode, m2);
208 }
209 (void)printf("\n");
210 siginfo = 0;
211 }
212 }
213 if (errno)
214 err(1, "fts_read");
215 exit(rval);
216 }
217
218 static void
usage(void)219 usage(void)
220 {
221 (void)fprintf(stderr,
222 "usage: chmod [-fhv] [-R [-H | -L | -P]] mode file ...\n");
223 exit(1);
224 }
225
226 static int
may_have_nfs4acl(const FTSENT * ent,int hflag)227 may_have_nfs4acl(const FTSENT *ent, int hflag)
228 {
229 int ret;
230 static dev_t previous_dev = NODEV;
231 static int supports_acls = -1;
232
233 if (previous_dev != ent->fts_statp->st_dev) {
234 previous_dev = ent->fts_statp->st_dev;
235 supports_acls = 0;
236
237 if (hflag)
238 ret = lpathconf(ent->fts_accpath, _PC_ACL_NFS4);
239 else
240 ret = pathconf(ent->fts_accpath, _PC_ACL_NFS4);
241 if (ret > 0)
242 supports_acls = 1;
243 else if (ret < 0 && errno != EINVAL)
244 warn("%s", ent->fts_path);
245 }
246
247 return (supports_acls);
248 }
249