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 (and probably POSIX.2) the -h option
  83                          * causes chmod to change the mode of the symbolic
  84                          * link.  4.4BSD's symbolic links didn't have modes,
  85                          * so it was an undocumented noop.  In FreeBSD 3.0,
  86                          * lchmod(2) is introduced and this option does real
  87                          * work.
  88                          */
  89                         hflag = 1;
  90                         break;
  91                 /*
  92                  * XXX
  93                  * "-[rwx]" are valid mode commands.  If they are the entire
  94                  * argument, getopt has moved past them, so decrement optind.
  95                  * Regardless, we're done argument processing.
  96                  */
  97                 case 'g': case 'o': case 'r': case 's':
  98                 case 't': case 'u': case 'w': case 'X': case 'x':
  99                         if (argv[optind - 1][0] == '-' &&
 100                             argv[optind - 1][1] == ch &&
 101                             argv[optind - 1][2] == '\0')
 102                                 --optind;
 103                         goto done;
 104                 case 'v':
 105                         vflag++;
 106                         break;
 107                 case '?':
 108                 default:
 109                         usage();
 110                 }
 111 done:   argv += optind;
 112         argc -= optind;
 113
 114         if (argc < 2)
 115                 usage();
 116
 117         if (Rflag) {
 118                 if (hflag)
 119                         errx(1, "the -R and -h options may not be "
 120                             "specified together.");
 121                 if (Lflag) {
 122                         fts_options = FTS_LOGICAL;
 123                 } else {
 124                         fts_options = FTS_PHYSICAL;
 125
 126                         if (Hflag) {
 127                                 fts_options |= FTS_COMFOLLOW;
 128                         }
 129                 }
 130         } else if (hflag) {
 131                 fts_options = FTS_PHYSICAL;
 132         } else {
 133                 fts_options = FTS_LOGICAL;
 134         }
 135
 136         mode = *argv;
 137         errno = 0;
 138         if ((set = setmode(mode)) == NULL) {
 139                 if (!errno)
 140                         errx(1, "invalid file mode: %s", mode);
 141                 else
 142                         /* malloc for setmode() failed */
 143                         err(1, "setmode failed");
 144         }
 145
 146         if ((ftsp = fts_open(++argv, fts_options, 0)) == NULL)
 147                 err(1, "fts_open");
 148         for (rval = 0; (p = fts_read(ftsp)) != NULL;) {
 149                 int atflag;
 150
 151                 if ((fts_options & FTS_LOGICAL) ||
 152                     ((fts_options & FTS_COMFOLLOW) &&
 153                     p->fts_level == FTS_ROOTLEVEL))
 154                         atflag = 0;
 155                 else
 156                         atflag = AT_SYMLINK_NOFOLLOW;
 157
 158                 switch (p->fts_info) {
 159                 case FTS_D:
 160                         if (!Rflag)
 161                                 fts_set(ftsp, p, FTS_SKIP);
 162                         break;
 163                 case FTS_DNR:                   /* Warn, chmod. */
 164                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 165                         rval = 1;
 166                         break;
 167                 case FTS_DP:                    /* Already changed at FTS_D. */
 168                         continue;
 169                 case FTS_ERR:                   /* Warn, continue. */
 170                 case FTS_NS:
 171                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 172                         rval = 1;
 173                         continue;
 174                 default:
 175                         break;
 176                 }
 177                 newmode = getmode(set, p->fts_statp->st_mode);
 178                 if ((newmode & ALLPERMS) == (p->fts_statp->st_mode & ALLPERMS))
 179                         continue;
 180                 if (fchmodat(AT_FDCWD, p->fts_accpath, newmode, atflag) == -1
 181                     && !fflag) {
 182                         warn("%s", p->fts_path);
 183                         rval = 1;
 184                 } else if (vflag) {
 185                         printf("%s", p->fts_path);
 186
 187                         if (vflag > 1) {
 188                                 char m1[12], m2[12];
 189
 190                                 strmode(p->fts_statp->st_mode, m1);
 191                                 strmode((p->fts_statp->st_mode &
 192                                     S_IFMT) | newmode, m2);
 193                                 printf(": 0%o [%s] -> 0%o [%s]",
 194                                     p->fts_statp->st_mode, m1,
 195                                     (p->fts_statp->st_mode & S_IFMT) |
 196                                     newmode, m2);
 197                         }
 198                         printf("\n");
 199                 }
 200         }
 201         if (errno)
 202                 err(1, "fts_read");
 203         exit(rval);
 204 }
 205
 206 static void
 207 usage(void)
 208 {
 209         fprintf(stderr,
 210             "usage: chmod [-fhv] [-R [-H | -L | -P]] mode file ...\n");
 211         exit(1);
 212 }