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: src/bin/chmod/chmod.c,v 1.16.2.6 2002/10/18 01:36:38 trhodes Exp $
  32  * $DragonFly: src/bin/chmod/chmod.c,v 1.9 2008/09/02 22:13:11 swildner Exp $
  33  */
  34
  35 #include <sys/types.h>
  36 #include <sys/stat.h>
  37
  38 #include <err.h>
  39 #include <errno.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         mode_t newmode;
  55         void *set;
  56         int Hflag, Lflag, Rflag, ch, fflag;
  57         int fts_options, hflag, rval, vflag;
  58         char *mode;
  59         int (*change_mode) (const char *, mode_t);
  60
  61         Hflag = Lflag = Rflag = fflag = hflag = vflag = 0;
  62         while ((ch = getopt(argc, argv, "HLPRXfghorstuvwx")) != -1)
  63                 switch (ch) {
  64                 case 'H':
  65                         Hflag = 1;
  66                         Lflag = 0;
  67                         break;
  68                 case 'L':
  69                         Lflag = 1;
  70                         Hflag = 0;
  71                         break;
  72                 case 'P':
  73                         Hflag = Lflag = 0;
  74                         break;
  75                 case 'R':
  76                         Rflag = 1;
  77                         break;
  78                 case 'f':
  79                         fflag = 1;
  80                         break;
  81                 case 'h':
  82                         /*
  83                          * In System V (and probably POSIX.2) the -h option
  84                          * causes chmod to change the mode of the symbolic
  85                          * link.  4.4BSD's symbolic links didn't have modes,
  86                          * so it was an undocumented noop.  In FreeBSD 3.0,
  87                          * lchmod(2) is introduced and this option does real
  88                          * work.
  89                          */
  90                         hflag = 1;
  91                         break;
  92                 /*
  93                  * XXX
  94                  * "-[rwx]" are valid mode commands.  If they are the entire
  95                  * argument, getopt has moved past them, so decrement optind.
  96                  * Regardless, we're done argument processing.
  97                  */
  98                 case 'g': case 'o': case 'r': case 's':
  99                 case 't': case 'u': case 'w': case 'X': case 'x':
 100                         if (argv[optind - 1][0] == '-' &&
 101                             argv[optind - 1][1] == ch &&
 102                             argv[optind - 1][2] == '\0')
 103                                 --optind;
 104                         goto done;
 105                 case 'v':
 106                         vflag = 1;
 107                         break;
 108                 default:
 109                         usage();
 110                 }
 111 done:   argv += optind;
 112         argc -= optind;
 113
 114         if (argc < 2)
 115                 usage();
 116
 117         fts_options = FTS_PHYSICAL;
 118         if (Rflag) {
 119                 if (hflag)
 120                         errx(1,
 121                 "the -R and -h options may not be specified together.");
 122                 if (Hflag)
 123                         fts_options |= FTS_COMFOLLOW;
 124                 if (Lflag) {
 125                         fts_options &= ~FTS_PHYSICAL;
 126                         fts_options |= FTS_LOGICAL;
 127                 }
 128         }
 129
 130         if (hflag)
 131                 change_mode = lchmod;
 132         else
 133                 change_mode = chmod;
 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, 0)) == NULL)
 146                 err(1, NULL);
 147         for (rval = 0; (p = fts_read(ftsp)) != NULL;) {
 148                 switch (p->fts_info) {
 149                 case FTS_D:                     /* Change it at FTS_DP. */
 150                         if (!Rflag)
 151                                 fts_set(ftsp, p, FTS_SKIP);
 152                         continue;
 153                 case FTS_DNR:                   /* Warn, chmod, continue. */
 154                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 155                         rval = 1;
 156                         break;
 157                 case FTS_ERR:                   /* Warn, continue. */
 158                 case FTS_NS:
 159                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 160                         rval = 1;
 161                         continue;
 162                 case FTS_SL:                    /* Ignore. */
 163                 case FTS_SLNONE:
 164                         /*
 165                          * The only symlinks that end up here are ones that
 166                          * don't point to anything and ones that we found
 167                          * doing a physical walk.
 168                          */
 169                         if (!hflag)
 170                                 continue;
 171                         /* else */
 172                         /* FALLTHROUGH */
 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 ((*change_mode)(p->fts_accpath, newmode) && !fflag) {
 180                         warn("%s", p->fts_path);
 181                         rval = 1;
 182                 } else {
 183                         if (vflag)
 184                                 printf("%s\n", p->fts_accpath);
 185                 }
 186         }
 187         if (errno)
 188                 err(1, "fts_read");
 189         free(set);
 190         exit(rval);
 191 }
 192
 193 static void
 194 usage(void)
 195 {
 196         fprintf(stderr,
 197             "usage: chmod [-fhv] [-R [-H | -L | -P]] mode file ...\n");
 198         exit(1);
 199 }