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 52 siginfo_handler(int sig __unused) 53 { 54 55 siginfo = 1; 56 } 57 58 int 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 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 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