chmod/chmod.c

   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  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifndef lint
  35 static char const copyright[] =
  36 "@(#) Copyright (c) 1989, 1993, 1994\n\
  37         The Regents of the University of California.  All rights reserved.\n";
  38 #endif /* not lint */
  39
  40 #ifndef lint
  41 #if 0
  42 static char sccsid[] = "@(#)chmod.c     8.8 (Berkeley) 4/1/94";
  43 #endif
  44 #endif /* not lint */
  45 #include <sys/cdefs.h>
  46 __RCSID("$FreeBSD: src/bin/chmod/chmod.c,v 1.27 2002/08/04 05:29:13 obrien Exp $");
  47
  48 #include <sys/types.h>
  49 #include <sys/stat.h>
  50
  51 #include <err.h>
  52 #include <errno.h>
  53 #include <fts.h>
  54 #include <limits.h>
  55 #include <stdio.h>
  56 #include <stdlib.h>
  57 #include <string.h>
  58 #include <unistd.h>
  59
  60 int main(int, char *[]);
  61 void usage(void);
  62
  63 int
  64 main(int argc, char *argv[])
  65 {
  66         FTS *ftsp;
  67         FTSENT *p;
  68         mode_t *set;
  69         long val;
  70         int oct;
  71         int Hflag, Lflag, Rflag, ch, fflag, fts_options, hflag, rval;
  72         int vflag;
  73         char *ep, *mode;
  74         mode_t newmode, omode;
  75         int (*change_mode)(const char *, mode_t);
  76
  77         set = NULL;
  78         omode = 0;
  79         Hflag = Lflag = Rflag = fflag = hflag = vflag = 0;
  80         while ((ch = getopt(argc, argv, "HLPRXfghorstuvwx")) != -1)
  81                 switch (ch) {
  82                 case 'H':
  83                         Hflag = 1;
  84                         Lflag = 0;
  85                         break;
  86                 case 'L':
  87                         Lflag = 1;
  88                         Hflag = 0;
  89                         break;
  90                 case 'P':
  91                         Hflag = Lflag = 0;
  92                         break;
  93                 case 'R':
  94                         Rflag = 1;
  95                         break;
  96                 case 'f':
  97                         fflag = 1;
  98                         break;
  99 #ifndef __APPLE__
 100                 case 'h':
 101                         /*
 102                          * In System V (and probably POSIX.2) the -h option
 103                          * causes chmod to change the mode of the symbolic
 104                          * link.  4.4BSD's symbolic links didn't have modes,
 105                          * so it was an undocumented noop.  In FreeBSD 3.0,
 106                          * lchmod(2) is introduced and this option does real
 107                          * work.
 108                          */
 109                         hflag = 1;
 110                         break;
 111 #endif /* __APPLE__ */
 112                 /*
 113                  * XXX
 114                  * "-[rwx]" are valid mode commands.  If they are the entire
 115                  * argument, getopt has moved past them, so decrement optind.
 116                  * Regardless, we're done argument processing.
 117                  */
 118                 case 'g': case 'o': case 'r': case 's':
 119                 case 't': case 'u': case 'w': case 'X': case 'x':
 120                         if (argv[optind - 1][0] == '-' &&
 121                             argv[optind - 1][1] == ch &&
 122                             argv[optind - 1][2] == '\0')
 123                                 --optind;
 124                         goto done;
 125                 case 'v':
 126                         vflag++;
 127                         break;
 128                 case '?':
 129                 default:
 130                         usage();
 131                 }
 132 done:   argv += optind;
 133         argc -= optind;
 134
 135         if (argc < 2)
 136                 usage();
 137
 138         if (Rflag) {
 139                 fts_options = FTS_PHYSICAL;
 140                 if (hflag)
 141                         errx(1,
 142                 "the -R and -h options may not be specified together.");
 143                 if (Hflag)
 144                         fts_options |= FTS_COMFOLLOW;
 145                 if (Lflag) {
 146                         fts_options &= ~FTS_PHYSICAL;
 147                         fts_options |= FTS_LOGICAL;
 148                 }
 149         } else
 150                 fts_options = hflag ? FTS_PHYSICAL : FTS_LOGICAL;
 151
 152 #ifndef __APPLE__
 153         if (hflag)
 154                 change_mode = lchmod;
 155         else
 156                 change_mode = chmod;
 157 #else
 158         change_mode = chmod;
 159 #endif /* __APPLE__ */
 160
 161         mode = *argv;
 162         if (*mode >= '0' && *mode <= '7') {
 163                 errno = 0;
 164                 val = strtol(mode, &ep, 8);
 165                 if (val > USHRT_MAX || val < 0)
 166                         errno = ERANGE;
 167                 if (errno)
 168                         err(1, "invalid file mode: %s", mode);
 169                 if (*ep)
 170                         errx(1, "invalid file mode: %s", mode);
 171                 omode = (mode_t)val;
 172                 oct = 1;
 173         } else {
 174                 if ((set = setmode(mode)) == NULL)
 175                         errx(1, "invalid file mode: %s", mode);
 176                 oct = 0;
 177         }
 178
 179         if ((ftsp = fts_open(++argv, fts_options, 0)) == NULL)
 180                 err(1, "fts_open");
 181         for (rval = 0; (p = fts_read(ftsp)) != NULL;) {
 182                 switch (p->fts_info) {
 183                 case FTS_D:                     /* Change it at FTS_DP. */
 184                         if (!Rflag)
 185                                 fts_set(ftsp, p, FTS_SKIP);
 186                         continue;
 187                 case FTS_DNR:                   /* Warn, chmod, continue. */
 188                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 189                         rval = 1;
 190                         break;
 191                 case FTS_ERR:                   /* Warn, continue. */
 192                 case FTS_NS:
 193                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 194                         rval = 1;
 195                         continue;
 196                 case FTS_SL:                    /* Ignore. */
 197                 case FTS_SLNONE:
 198                         /*
 199                          * The only symlinks that end up here are ones that
 200                          * don't point to anything and ones that we found
 201                          * doing a physical walk.
 202                          */
 203                         if (!hflag)
 204                                 continue;
 205                         /* else */
 206                         /* FALLTHROUGH */
 207                 default:
 208                         break;
 209                 }
 210                 newmode = oct ? omode : getmode(set, p->fts_statp->st_mode);
 211                 if ((newmode & ALLPERMS) == (p->fts_statp->st_mode & ALLPERMS))
 212                         continue;
 213                 if ((*change_mode)(p->fts_accpath, newmode) && !fflag) {
 214                         warn("%s", p->fts_path);
 215                         rval = 1;
 216                 } else {
 217                         if (vflag) {
 218                                 (void)printf("%s", p->fts_accpath);
 219
 220                                 if (vflag > 1) {
 221                                         char m1[12], m2[12];
 222
 223                                         strmode(p->fts_statp->st_mode, m1);
 224                                         strmode((p->fts_statp->st_mode &
 225                                             S_IFMT) | newmode, m2);
 226
 227                                         (void)printf(": 0%o [%s] -> 0%o [%s]",
 228                                             p->fts_statp->st_mode, m1,
 229                                             (p->fts_statp->st_mode & S_IFMT) |
 230                                             newmode, m2);
 231                                 }
 232                                 (void)printf("\n");
 233                         }
 234
 235                 }
 236         }
 237         if (errno)
 238                 err(1, "fts_read");
 239         free(set);
 240         exit(rval);
 241 }
 242
 243 void
 244 usage(void)
 245 {
 246 #ifdef __APPLE__
 247         (void)fprintf(stderr,
 248             "usage: chmod [-fv] [-R [-H | -L | -P]] mode file ...\n");
 249 #else
 250         (void)fprintf(stderr,
 251             "usage: chmod [-fhv] [-R [-H | -L | -P]] mode file ...\n");
 252 #endif /* __APPLE__ */
 253         exit(1);
 254 }