bin/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  * @(#) Copyright (c) 1989, 1993, 1994 The Regents of the University of California.  All rights reserved.
  34  * @(#)chmod.c  8.8 (Berkeley) 4/1/94
  35  * $FreeBSD: src/bin/chmod/chmod.c,v 1.16.2.6 2002/10/18 01:36:38 trhodes Exp $
  36  * $DragonFly: src/bin/chmod/chmod.c,v 1.8 2004/10/31 16:18:37 liamfoy Exp $
  37  */
  38
  39 #include <sys/types.h>
  40 #include <sys/stat.h>
  41
  42 #include <err.h>
  43 #include <errno.h>
  44 #include <fts.h>
  45 #include <limits.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <string.h>
  49 #include <unistd.h>
  50
  51 static void usage (void);
  52
  53 int
  54 main(int argc, char **argv)
  55 {
  56         FTS *ftsp;
  57         FTSENT *p;
  58         mode_t newmode;
  59         void *set;
  60         int Hflag, Lflag, Pflag, Rflag, ch, fflag;
  61         int fts_options, hflag, rval, vflag;
  62         char *mode;
  63         int (*change_mode) (const char *, mode_t);
  64
  65         Hflag = Lflag = Pflag = Rflag = fflag = hflag = vflag = 0;
  66         while ((ch = getopt(argc, argv, "HLPRXfghorstuvwx")) != -1)
  67                 switch (ch) {
  68                 case 'H':
  69                         Hflag = 1;
  70                         Lflag = Pflag = 0;
  71                         break;
  72                 case 'L':
  73                         Lflag = 1;
  74                         Hflag = Pflag = 0;
  75                         break;
  76                 case 'P':
  77                         Pflag = 1;
  78                         Hflag = Lflag = 0;
  79                         break;
  80                 case 'R':
  81                         Rflag = 1;
  82                         break;
  83                 case 'f':
  84                         fflag = 1;
  85                         break;
  86                 case 'h':
  87                         /*
  88                          * In System V (and probably POSIX.2) the -h option
  89                          * causes chmod to change the mode of the symbolic
  90                          * link.  4.4BSD's symbolic links didn't have modes,
  91                          * so it was an undocumented noop.  In FreeBSD 3.0,
  92                          * lchmod(2) is introduced and this option does real
  93                          * work.
  94                          */
  95                         hflag = 1;
  96                         break;
  97                 /*
  98                  * XXX
  99                  * "-[rwx]" are valid mode commands.  If they are the entire
 100                  * argument, getopt has moved past them, so decrement optind.
 101                  * Regardless, we're done argument processing.
 102                  */
 103                 case 'g': case 'o': case 'r': case 's':
 104                 case 't': case 'u': case 'w': case 'X': case 'x':
 105                         if (argv[optind - 1][0] == '-' &&
 106                             argv[optind - 1][1] == ch &&
 107                             argv[optind - 1][2] == '\0')
 108                                 --optind;
 109                         goto done;
 110                 case 'v':
 111                         vflag = 1;
 112                         break;
 113                 default:
 114                         usage();
 115                 }
 116 done:   argv += optind;
 117         argc -= optind;
 118
 119         if (argc < 2)
 120                 usage();
 121
 122         fts_options = FTS_PHYSICAL;
 123         if (Rflag) {
 124                 if (hflag)
 125                         errx(1,
 126                 "the -R and -h options may not be specified together.");
 127                 if (Hflag)
 128                         fts_options |= FTS_COMFOLLOW;
 129                 if (Lflag) {
 130                         fts_options &= ~FTS_PHYSICAL;
 131                         fts_options |= FTS_LOGICAL;
 132                 }
 133         }
 134
 135         if (hflag)
 136                 change_mode = lchmod;
 137         else
 138                 change_mode = chmod;
 139
 140         mode = *argv;
 141         errno = 0;
 142         if ((set = setmode(mode)) == NULL) {
 143                 if (!errno)
 144                         errx(1, "invalid file mode: %s", mode);
 145                 else
 146                         /* malloc for setmode() failed */
 147                         err(1, "setmode failed");
 148         }
 149
 150         if ((ftsp = fts_open(++argv, fts_options, 0)) == NULL)
 151                 err(1, NULL);
 152         for (rval = 0; (p = fts_read(ftsp)) != NULL;) {
 153                 switch (p->fts_info) {
 154                 case FTS_D:                     /* Change it at FTS_DP. */
 155                         if (!Rflag)
 156                                 fts_set(ftsp, p, FTS_SKIP);
 157                         continue;
 158                 case FTS_DNR:                   /* Warn, chmod, continue. */
 159                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 160                         rval = 1;
 161                         break;
 162                 case FTS_ERR:                   /* Warn, continue. */
 163                 case FTS_NS:
 164                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 165                         rval = 1;
 166                         continue;
 167                 case FTS_SL:                    /* Ignore. */
 168                 case FTS_SLNONE:
 169                         /*
 170                          * The only symlinks that end up here are ones that
 171                          * don't point to anything and ones that we found
 172                          * doing a physical walk.
 173                          */
 174                         if (!hflag)
 175                                 continue;
 176                         /* else */
 177                         /* FALLTHROUGH */
 178                 default:
 179                         break;
 180                 }
 181                 newmode = getmode(set, p->fts_statp->st_mode);
 182                 if ((newmode & ALLPERMS) == (p->fts_statp->st_mode & ALLPERMS))
 183                         continue;
 184                 if ((*change_mode)(p->fts_accpath, newmode) && !fflag) {
 185                         warn("%s", p->fts_path);
 186                         rval = 1;
 187                 } else {
 188                         if (vflag)
 189                                 printf("%s\n", p->fts_accpath);
 190                 }
 191         }
 192         if (errno)
 193                 err(1, "fts_read");
 194         free(set);
 195         exit(rval);
 196 }
 197
 198 static void
 199 usage(void)
 200 {
 201         fprintf(stderr,
 202             "usage: chmod [-fhv] [-R [-H | -L | -P]] mode file ...\n");
 203         exit(1);
 204 }