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. 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  * @(#) Copyright (c) 1989, 1993, 1994 The Regents of the University of California.  All rights reserved.
  30  * @(#)chmod.c  8.8 (Berkeley) 4/1/94
  31  * $FreeBSD: head/bin/chmod/chmod.c 283997 2015-06-04 19:18:58Z pluknet $
  32  */
  33
  34 #include <sys/param.h>
  35 #include <sys/stat.h>
  36
  37 #include <err.h>
  38 #include <errno.h>
  39 #include <fcntl.h>
  40 #include <fts.h>
  41 #include <limits.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include <unistd.h>
  46
  47 static void usage(void);
  48
  49 int
  50 main(int argc, char *argv[])
  51 {
  52         FTS *ftsp;
  53         FTSENT *p;
  54         void *set;
  55         int Hflag, Lflag, Rflag, ch, fflag;
  56         int fts_options, hflag, rval, vflag;
  57         char *mode;
  58         mode_t newmode;
  59
  60         Hflag = Lflag = Rflag = fflag = hflag = vflag = 0;
  61         while ((ch = getopt(argc, argv, "HLPRXfghorstuvwx")) != -1)
  62                 switch (ch) {
  63                 case 'H':
  64                         Hflag = 1;
  65                         Lflag = 0;
  66                         break;
  67                 case 'L':
  68                         Lflag = 1;
  69                         Hflag = 0;
  70                         break;
  71                 case 'P':
  72                         Hflag = Lflag = 0;
  73                         break;
  74                 case 'R':
  75                         Rflag = 1;
  76                         break;
  77                 case 'f':
  78                         fflag = 1;
  79                         break;
  80                 case 'h':
  81                         /*
  82                          * In System V the -h option causes chmod to change the
  83                          * mode of the symbolic link. 4.4BSD's symbolic links
  84                          * didn't have modes, so it was an undocumented noop.
  85                          * In FreeBSD 3.0, lchmod(2) is introduced and this
  86                          * option does real work.
  87                          */
  88                         hflag = 1;
  89                         break;
  90                 /*
  91                  * XXX
  92                  * "-[rwx]" are valid mode commands.  If they are the entire
  93                  * argument, getopt has moved past them, so decrement optind.
  94                  * Regardless, we're done argument processing.
  95                  */
  96                 case 'g': case 'o': case 'r': case 's':
  97                 case 't': case 'u': case 'w': case 'X': case 'x':
  98                         if (argv[optind - 1][0] == '-' &&
  99                             argv[optind - 1][1] == ch &&
 100                             argv[optind - 1][2] == '\0')
 101                                 --optind;
 102                         goto done;
 103                 case 'v':
 104                         vflag++;
 105                         break;
 106                 case '?':
 107                 default:
 108                         usage();
 109                 }
 110 done:   argv += optind;
 111         argc -= optind;
 112
 113         if (argc < 2)
 114                 usage();
 115
 116         if (Rflag) {
 117                 if (hflag)
 118                         errx(1, "the -R and -h options may not be "
 119                             "specified together.");
 120                 if (Lflag) {
 121                         fts_options = FTS_LOGICAL;
 122                 } else {
 123                         fts_options = FTS_PHYSICAL;
 124
 125                         if (Hflag) {
 126                                 fts_options |= FTS_COMFOLLOW;
 127                         }
 128                 }
 129         } else if (hflag) {
 130                 fts_options = FTS_PHYSICAL;
 131         } else {
 132                 fts_options = FTS_LOGICAL;
 133         }
 134
 135         mode = *argv;
 136         errno = 0;
 137         if ((set = setmode(mode)) == NULL) {
 138                 if (!errno)
 139                         errx(1, "invalid file mode: %s", mode);
 140                 else
 141                         /* malloc for setmode() failed */
 142                         err(1, "setmode failed");
 143         }
 144
 145         if ((ftsp = fts_open(++argv, fts_options, NULL)) == NULL)
 146                 err(1, "fts_open");
 147         for (rval = 0; (p = fts_read(ftsp)) != NULL;) {
 148                 int atflag;
 149
 150                 if ((fts_options & FTS_LOGICAL) ||
 151                     ((fts_options & FTS_COMFOLLOW) &&
 152                     p->fts_level == FTS_ROOTLEVEL))
 153                         atflag = 0;
 154                 else
 155                         atflag = AT_SYMLINK_NOFOLLOW;
 156
 157                 switch (p->fts_info) {
 158                 case FTS_D:
 159                         if (!Rflag)
 160                                 fts_set(ftsp, p, FTS_SKIP);
 161                         break;
 162                 case FTS_DNR:                   /* Warn, chmod. */
 163                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 164                         rval = 1;
 165                         break;
 166                 case FTS_DP:                    /* Already changed at FTS_D. */
 167                         continue;
 168                 case FTS_ERR:                   /* Warn, continue. */
 169                 case FTS_NS:
 170                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 171                         rval = 1;
 172                         continue;
 173                 default:
 174                         break;
 175                 }
 176                 newmode = getmode(set, p->fts_statp->st_mode);
 177                 if ((newmode & ALLPERMS) == (p->fts_statp->st_mode & ALLPERMS))
 178                         continue;
 179                 if (fchmodat(AT_FDCWD, p->fts_accpath, newmode, atflag) == -1
 180                     && !fflag) {
 181                         warn("%s", p->fts_path);
 182                         rval = 1;
 183                 } else if (vflag) {
 184                         printf("%s", p->fts_path);
 185
 186                         if (vflag > 1) {
 187                                 char m1[12], m2[12];
 188
 189                                 strmode(p->fts_statp->st_mode, m1);
 190                                 strmode((p->fts_statp->st_mode &
 191                                     S_IFMT) | newmode, m2);
 192                                 printf(": 0%o [%s] -> 0%o [%s]",
 193                                     p->fts_statp->st_mode, m1,
 194                                     (p->fts_statp->st_mode & S_IFMT) |
 195                                     newmode, m2);
 196                         }
 197                         printf("\n");
 198                 }
 199         }
 200         if (errno)
 201                 err(1, "fts_read");
 202         exit(rval);
 203 }
 204
 205 static void
 206 usage(void)
 207 {
 208         fprintf(stderr,
 209             "usage: chmod [-fhv] [-R [-H | -L | -P]] mode file ...\n");
 210         exit(1);
 211 }