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) __dead2; 63 static int may_have_nfs4acl(const FTSENT *ent, int hflag); 64 65 static void 66 siginfo_handler(int sig __unused) 67 { 68 69 siginfo = 1; 70 } 71 72 int 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 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 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