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 1.9 2008/09/02 22:13:11 swildner 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, 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 = Rflag = fflag = hflag = vflag = 0;
  66         while ((ch = getopt(argc, argv, "HLPRXfghorstuvwx")) != -1)
  67                 switch (ch) {
  68                 case 'H':
  69                         Hflag = 1;
  70                         Lflag = 0;
  71                         break;
  72                 case 'L':
  73                         Lflag = 1;
  74                         Hflag = 0;
  75                         break;
  76                 case 'P':
  77                         Hflag = Lflag = 0;
  78                         break;
  79                 case 'R':
  80                         Rflag = 1;
  81                         break;
  82                 case 'f':
  83                         fflag = 1;
  84                         break;
  85                 case 'h':
  86                         /*
  87                          * In System V (and probably POSIX.2) the -h option
  88                          * causes chmod to change the mode of the symbolic
  89                          * link.  4.4BSD's symbolic links didn't have modes,
  90                          * so it was an undocumented noop.  In FreeBSD 3.0,
  91                          * lchmod(2) is introduced and this option does real
  92                          * work.
  93                          */
  94                         hflag = 1;
  95                         break;
  96                 /*
  97                  * XXX
  98                  * "-[rwx]" are valid mode commands.  If they are the entire
  99                  * argument, getopt has moved past them, so decrement optind.
 100                  * Regardless, we're done argument processing.
 101                  */
 102                 case 'g': case 'o': case 'r': case 's':
 103                 case 't': case 'u': case 'w': case 'X': case 'x':
 104                         if (argv[optind - 1][0] == '-' &&
 105                             argv[optind - 1][1] == ch &&
 106                             argv[optind - 1][2] == '\0')
 107                                 --optind;
 108                         goto done;
 109                 case 'v':
 110                         vflag = 1;
 111                         break;
 112                 default:
 113                         usage();
 114                 }
 115 done:   argv += optind;
 116         argc -= optind;
 117
 118         if (argc < 2)
 119                 usage();
 120
 121         fts_options = FTS_PHYSICAL;
 122         if (Rflag) {
 123                 if (hflag)
 124                         errx(1,
 125                 "the -R and -h options may not be specified together.");
 126                 if (Hflag)
 127                         fts_options |= FTS_COMFOLLOW;
 128                 if (Lflag) {
 129                         fts_options &= ~FTS_PHYSICAL;
 130                         fts_options |= FTS_LOGICAL;
 131                 }
 132         }
 133
 134         if (hflag)
 135                 change_mode = lchmod;
 136         else
 137                 change_mode = chmod;
 138
 139         mode = *argv;
 140         errno = 0;
 141         if ((set = setmode(mode)) == NULL) {
 142                 if (!errno)
 143                         errx(1, "invalid file mode: %s", mode);
 144                 else
 145                         /* malloc for setmode() failed */
 146                         err(1, "setmode failed");
 147         }
 148
 149         if ((ftsp = fts_open(++argv, fts_options, 0)) == NULL)
 150                 err(1, NULL);
 151         for (rval = 0; (p = fts_read(ftsp)) != NULL;) {
 152                 switch (p->fts_info) {
 153                 case FTS_D:                     /* Change it at FTS_DP. */
 154                         if (!Rflag)
 155                                 fts_set(ftsp, p, FTS_SKIP);
 156                         continue;
 157                 case FTS_DNR:                   /* Warn, chmod, continue. */
 158                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 159                         rval = 1;
 160                         break;
 161                 case FTS_ERR:                   /* Warn, continue. */
 162                 case FTS_NS:
 163                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 164                         rval = 1;
 165                         continue;
 166                 case FTS_SL:                    /* Ignore. */
 167                 case FTS_SLNONE:
 168                         /*
 169                          * The only symlinks that end up here are ones that
 170                          * don't point to anything and ones that we found
 171                          * doing a physical walk.
 172                          */
 173                         if (!hflag)
 174                                 continue;
 175                         /* else */
 176                         /* FALLTHROUGH */
 177                 default:
 178                         break;
 179                 }
 180                 newmode = getmode(set, p->fts_statp->st_mode);
 181                 if ((newmode & ALLPERMS) == (p->fts_statp->st_mode & ALLPERMS))
 182                         continue;
 183                 if ((*change_mode)(p->fts_accpath, newmode) && !fflag) {
 184                         warn("%s", p->fts_path);
 185                         rval = 1;
 186                 } else {
 187                         if (vflag)
 188                                 printf("%s\n", p->fts_accpath);
 189                 }
 190         }
 191         if (errno)
 192                 err(1, "fts_read");
 193         free(set);
 194         exit(rval);
 195 }
 196
 197 static void
 198 usage(void)
 199 {
 200         fprintf(stderr,
 201             "usage: chmod [-fhv] [-R [-H | -L | -P]] mode file ...\n");
 202         exit(1);
 203 }