chmod.c revision 195243
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: head/bin/chmod/chmod.c 195243 2009-07-01 15:52:19Z trasz $"); 43 44#include <sys/types.h> 45#include <sys/stat.h> 46 47#include <err.h> 48#include <errno.h> 49#include <fts.h> 50#include <limits.h> 51#include <stdio.h> 52#include <stdlib.h> 53#include <string.h> 54#include <unistd.h> 55 56static void usage(void); 57static int may_have_nfs4acl(const FTSENT *ent); 58 59int 60main(int argc, char *argv[]) 61{ 62 FTS *ftsp; 63 FTSENT *p; 64 mode_t *set; 65 int Hflag, Lflag, Rflag, ch, fflag, fts_options, hflag, rval; 66 int vflag; 67 char *mode; 68 mode_t newmode; 69 int (*change_mode)(const char *, mode_t); 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 fts_options = FTS_PHYSICAL; 131 if (hflag) 132 errx(1, 133 "the -R and -h options may not be specified together."); 134 if (Hflag) 135 fts_options |= FTS_COMFOLLOW; 136 if (Lflag) { 137 fts_options &= ~FTS_PHYSICAL; 138 fts_options |= FTS_LOGICAL; 139 } 140 } else 141 fts_options = hflag ? FTS_PHYSICAL : FTS_LOGICAL; 142 143 if (hflag) 144 change_mode = lchmod; 145 else 146 change_mode = chmod; 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 switch (p->fts_info) { 156 case FTS_D: /* Change it at FTS_DP. */ 157 if (!Rflag) 158 fts_set(ftsp, p, FTS_SKIP); 159 continue; 160 case FTS_DNR: /* Warn, chmod, continue. */ 161 warnx("%s: %s", p->fts_path, strerror(p->fts_errno)); 162 rval = 1; 163 break; 164 case FTS_ERR: /* Warn, continue. */ 165 case FTS_NS: 166 warnx("%s: %s", p->fts_path, strerror(p->fts_errno)); 167 rval = 1; 168 continue; 169 case FTS_SL: /* Ignore. */ 170 case FTS_SLNONE: 171 /* 172 * The only symlinks that end up here are ones that 173 * don't point to anything and ones that we found 174 * doing a physical walk. 175 */ 176 if (!hflag) 177 continue; 178 /* else */ 179 /* FALLTHROUGH */ 180 default: 181 break; 182 } 183 newmode = getmode(set, p->fts_statp->st_mode); 184 /* 185 * With NFSv4 ACLs, it is possible that applying a mode 186 * identical to the one computed from an ACL will change 187 * that ACL. 188 */ 189 if (may_have_nfs4acl(p) == 0 && 190 (newmode & ALLPERMS) == (p->fts_statp->st_mode & ALLPERMS)) 191 continue; 192 if ((*change_mode)(p->fts_accpath, newmode) && !fflag) { 193 warn("%s", p->fts_path); 194 rval = 1; 195 } else { 196 if (vflag) { 197 (void)printf("%s", p->fts_path); 198 199 if (vflag > 1) { 200 char m1[12], m2[12]; 201 202 strmode(p->fts_statp->st_mode, m1); 203 strmode((p->fts_statp->st_mode & 204 S_IFMT) | newmode, m2); 205 206 (void)printf(": 0%o [%s] -> 0%o [%s]", 207 p->fts_statp->st_mode, m1, 208 (p->fts_statp->st_mode & S_IFMT) | 209 newmode, m2); 210 } 211 (void)printf("\n"); 212 } 213 214 } 215 } 216 if (errno) 217 err(1, "fts_read"); 218 free(set); 219 exit(rval); 220} 221 222static void 223usage(void) 224{ 225 (void)fprintf(stderr, 226 "usage: chmod [-fhv] [-R [-H | -L | -P]] mode file ...\n"); 227 exit(1); 228} 229 230static int 231may_have_nfs4acl(const FTSENT *ent) 232{ 233 int ret; 234 static dev_t previous_dev = (dev_t)-1; 235 static int supports_acls = -1; 236 237 if (previous_dev != ent->fts_statp->st_dev) { 238 previous_dev = ent->fts_statp->st_dev; 239 supports_acls = 0; 240 241 ret = pathconf(ent->fts_accpath, _PC_ACL_NFS4); 242 if (ret > 0) 243 supports_acls = 1; 244 else if (ret < 0 && errno != EINVAL) 245 warn("%s", ent->fts_path); 246 } 247 248 return (supports_acls); 249} 250