chmod.c revision 283875
1/*- 2 * Copyright (c) 1989, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30#if 0 31#ifndef lint 32static char const copyright[] = 33"@(#) Copyright (c) 1989, 1993, 1994\n\ 34 The Regents of the University of California. All rights reserved.\n"; 35#endif /* not lint */ 36 37#ifndef lint 38static char sccsid[] = "@(#)chmod.c 8.8 (Berkeley) 4/1/94"; 39#endif /* not lint */ 40#endif 41#include <sys/cdefs.h> 42__FBSDID("$FreeBSD: stable/10/bin/chmod/chmod.c 283875 2015-06-01 09:04:57Z smh $"); 43 44#include <sys/param.h> 45#include <sys/stat.h> 46 47#include <err.h> 48#include <errno.h> 49#include <fcntl.h> 50#include <fts.h> 51#include <limits.h> 52#include <stdio.h> 53#include <stdlib.h> 54#include <string.h> 55#include <unistd.h> 56 57static void usage(void); 58static int may_have_nfs4acl(const FTSENT *ent, int hflag); 59 60int 61main(int argc, char *argv[]) 62{ 63 FTS *ftsp; 64 FTSENT *p; 65 mode_t *set; 66 int Hflag, Lflag, Rflag, ch, fflag, fts_options, hflag, rval; 67 int vflag; 68 char *mode; 69 mode_t newmode; 70 71 set = NULL; 72 Hflag = Lflag = Rflag = fflag = hflag = vflag = 0; 73 while ((ch = getopt(argc, argv, "HLPRXfghorstuvwx")) != -1) 74 switch (ch) { 75 case 'H': 76 Hflag = 1; 77 Lflag = 0; 78 break; 79 case 'L': 80 Lflag = 1; 81 Hflag = 0; 82 break; 83 case 'P': 84 Hflag = Lflag = 0; 85 break; 86 case 'R': 87 Rflag = 1; 88 break; 89 case 'f': 90 fflag = 1; 91 break; 92 case 'h': 93 /* 94 * In System V (and probably POSIX.2) the -h option 95 * causes chmod to change the mode of the symbolic 96 * link. 4.4BSD's symbolic links didn't have modes, 97 * so it was an undocumented noop. In FreeBSD 3.0, 98 * lchmod(2) is introduced and this option does real 99 * work. 100 */ 101 hflag = 1; 102 break; 103 /* 104 * XXX 105 * "-[rwx]" are valid mode commands. If they are the entire 106 * argument, getopt has moved past them, so decrement optind. 107 * Regardless, we're done argument processing. 108 */ 109 case 'g': case 'o': case 'r': case 's': 110 case 't': case 'u': case 'w': case 'X': case 'x': 111 if (argv[optind - 1][0] == '-' && 112 argv[optind - 1][1] == ch && 113 argv[optind - 1][2] == '\0') 114 --optind; 115 goto done; 116 case 'v': 117 vflag++; 118 break; 119 case '?': 120 default: 121 usage(); 122 } 123done: argv += optind; 124 argc -= optind; 125 126 if (argc < 2) 127 usage(); 128 129 if (Rflag) { 130 if (hflag) 131 errx(1, "the -R and -h options may not be " 132 "specified together."); 133 if (Lflag) { 134 fts_options = FTS_LOGICAL; 135 } else { 136 fts_options = FTS_PHYSICAL; 137 138 if (Hflag) { 139 fts_options |= FTS_COMFOLLOW; 140 } 141 } 142 } else if (hflag) { 143 fts_options = FTS_PHYSICAL; 144 } else { 145 fts_options = FTS_LOGICAL; 146 } 147 148 mode = *argv; 149 if ((set = setmode(mode)) == NULL) 150 errx(1, "invalid file mode: %s", mode); 151 152 if ((ftsp = fts_open(++argv, fts_options, 0)) == NULL) 153 err(1, "fts_open"); 154 for (rval = 0; (p = fts_read(ftsp)) != NULL;) { 155 int atflag; 156 157 if ((fts_options & FTS_LOGICAL) || 158 ((fts_options & FTS_COMFOLLOW) && 159 p->fts_level == FTS_ROOTLEVEL)) 160 atflag = 0; 161 else 162 atflag = AT_SYMLINK_NOFOLLOW; 163 164 switch (p->fts_info) { 165 case FTS_D: /* Change it at FTS_DP. */ 166 if (!Rflag) 167 fts_set(ftsp, p, FTS_SKIP); 168 continue; 169 case FTS_DNR: /* Warn, chmod. */ 170 warnx("%s: %s", p->fts_path, strerror(p->fts_errno)); 171 rval = 1; 172 break; 173 case FTS_ERR: /* Warn, continue. */ 174 case FTS_NS: 175 warnx("%s: %s", p->fts_path, strerror(p->fts_errno)); 176 rval = 1; 177 continue; 178 default: 179 break; 180 } 181 newmode = getmode(set, p->fts_statp->st_mode); 182 /* 183 * With NFSv4 ACLs, it is possible that applying a mode 184 * identical to the one computed from an ACL will change 185 * that ACL. 186 */ 187 if (may_have_nfs4acl(p, hflag) == 0 && 188 (newmode & ALLPERMS) == (p->fts_statp->st_mode & ALLPERMS)) 189 continue; 190 if (fchmodat(AT_FDCWD, p->fts_accpath, newmode, atflag) == -1 191 && !fflag) { 192 warn("%s", p->fts_path); 193 rval = 1; 194 } else if (vflag) { 195 (void)printf("%s", p->fts_path); 196 197 if (vflag > 1) { 198 char m1[12], m2[12]; 199 200 strmode(p->fts_statp->st_mode, m1); 201 strmode((p->fts_statp->st_mode & 202 S_IFMT) | newmode, m2); 203 (void)printf(": 0%o [%s] -> 0%o [%s]", 204 p->fts_statp->st_mode, m1, 205 (p->fts_statp->st_mode & S_IFMT) | 206 newmode, m2); 207 } 208 (void)printf("\n"); 209 } 210 } 211 if (errno) 212 err(1, "fts_read"); 213 exit(rval); 214} 215 216static void 217usage(void) 218{ 219 (void)fprintf(stderr, 220 "usage: chmod [-fhv] [-R [-H | -L | -P]] mode file ...\n"); 221 exit(1); 222} 223 224static int 225may_have_nfs4acl(const FTSENT *ent, int hflag) 226{ 227 int ret; 228 static dev_t previous_dev = NODEV; 229 static int supports_acls = -1; 230 231 if (previous_dev != ent->fts_statp->st_dev) { 232 previous_dev = ent->fts_statp->st_dev; 233 supports_acls = 0; 234 235 if (hflag) 236 ret = lpathconf(ent->fts_accpath, _PC_ACL_NFS4); 237 else 238 ret = pathconf(ent->fts_accpath, _PC_ACL_NFS4); 239 if (ret > 0) 240 supports_acls = 1; 241 else if (ret < 0 && errno != EINVAL) 242 warn("%s", ent->fts_path); 243 } 244 245 return (supports_acls); 246} 247