bin/chmod/chmod.c

   1 /* $NetBSD: chmod.c,v 1.38 2012/10/22 18:00:46 christos Exp $ */
   2
   3 /*
   4  * Copyright (c) 1989, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 __COPYRIGHT(
  35 "@(#) Copyright (c) 1989, 1993, 1994\
  36  The Regents of the University of California.  All rights reserved.");
  37 #endif /* not lint */
  38
  39 #ifndef lint
  40 #if 0
  41 static char sccsid[] = "@(#)chmod.c     8.8 (Berkeley) 4/1/94";
  42 #else
  43 __RCSID("$NetBSD: chmod.c,v 1.38 2012/10/22 18:00:46 christos Exp $");
  44 #endif
  45 #endif /* not lint */
  46
  47 #include <sys/param.h>
  48 #include <sys/stat.h>
  49 #include <sys/types.h>
  50
  51 #include <err.h>
  52 #include <errno.h>
  53 #include <fts.h>
  54 #include <limits.h>
  55 #include <locale.h>
  56 #include <stdio.h>
  57 #include <stdlib.h>
  58 #include <string.h>
  59 #include <unistd.h>
  60 #include <getopt.h>
  61
  62 __dead static void      usage(void);
  63
  64 struct option chmod_longopts[] = {
  65         { "reference",          required_argument,      0,
  66                                                 1 },
  67         { NULL,                 0,                      0,
  68                                                 0 },
  69 };
  70
  71 int
  72 main(int argc, char *argv[])
  73 {
  74         FTS *ftsp;
  75         FTSENT *p;
  76         void *set;
  77         mode_t mval;
  78         int Hflag, Lflag, Rflag, ch, fflag, fts_options, hflag, rval;
  79         char *mode, *reference;
  80         int (*change_mode)(const char *, mode_t);
  81
  82         setprogname(argv[0]);
  83         (void)setlocale(LC_ALL, "");
  84
  85         Hflag = Lflag = Rflag = fflag = hflag = 0;
  86         reference = NULL;
  87         while ((ch = getopt_long(argc, argv, "HLPRXfghorstuwx",
  88             chmod_longopts, NULL)) != -1)
  89                 switch (ch) {
  90                 case 1:
  91                         reference = optarg;
  92                         break;
  93                 case 'H':
  94                         Hflag = 1;
  95                         Lflag = 0;
  96                         break;
  97                 case 'L':
  98                         Lflag = 1;
  99                         Hflag = 0;
 100                         break;
 101                 case 'P':
 102                         Hflag = Lflag = 0;
 103                         break;
 104                 case 'R':
 105                         Rflag = 1;
 106                         break;
 107                 case 'f':
 108                         fflag = 1;
 109                         break;
 110                 case 'h':
 111                         /*
 112                          * In System V the -h option causes chmod to
 113                          * change the mode of the symbolic link.
 114                          * 4.4BSD's symbolic links didn't have modes,
 115                          * so it was an undocumented noop.  In NetBSD
 116                          * 1.3, lchmod(2) is introduced and this
 117                          * option does real work.
 118                          */
 119                         hflag = 1;
 120                         break;
 121                 /*
 122                  * XXX
 123                  * "-[rwx]" are valid mode commands.  If they are the entire
 124                  * argument, getopt has moved past them, so decrement optind.
 125                  * Regardless, we're done argument processing.
 126                  */
 127                 case 'g': case 'o': case 'r': case 's':
 128                 case 't': case 'u': case 'w': case 'X': case 'x':
 129                         if (argv[optind - 1][0] == '-' &&
 130                             argv[optind - 1][1] == ch &&
 131                             argv[optind - 1][2] == '\0')
 132                                 --optind;
 133                         goto done;
 134                 case '?':
 135                 default:
 136                         usage();
 137                 }
 138 done:   argv += optind;
 139         argc -= optind;
 140
 141         if (argc == 0 || (argc == 1 && reference == NULL))
 142                 usage();
 143
 144         fts_options = FTS_PHYSICAL;
 145         if (Rflag) {
 146                 if (hflag) {
 147                         errx(EXIT_FAILURE,
 148                 "the -R and -h options may not be specified together.");
 149                         /* NOTREACHED */
 150                 }
 151                 if (Hflag)
 152                         fts_options |= FTS_COMFOLLOW;
 153                 if (Lflag) {
 154                         fts_options &= ~FTS_PHYSICAL;
 155                         fts_options |= FTS_LOGICAL;
 156                 }
 157         } else if (!hflag)
 158                 fts_options |= FTS_COMFOLLOW;
 159         if (hflag)
 160                 change_mode = lchmod;
 161         else
 162                 change_mode = chmod;
 163
 164         if (reference == NULL) {
 165                 mode = *argv++;
 166                 if ((set = setmode(mode)) == NULL) {
 167                         err(EXIT_FAILURE, "Cannot set file mode `%s'", mode);
 168                         /* NOTREACHED */
 169                 }
 170                 mval = 0;
 171         } else {
 172                 struct stat st;
 173
 174                 if (stat(reference, &st) == -1)
 175                         err(EXIT_FAILURE, "Cannot stat `%s'", reference);
 176                 mval = st.st_mode;
 177                 set = NULL;
 178         }
 179
 180         if ((ftsp = fts_open(argv, fts_options, 0)) == NULL) {
 181                 err(EXIT_FAILURE, "fts_open");
 182                 /* NOTREACHED */
 183         }
 184         for (rval = 0; (p = fts_read(ftsp)) != NULL;) {
 185                 switch (p->fts_info) {
 186                 case FTS_D:
 187                         if (!Rflag)
 188                                 (void)fts_set(ftsp, p, FTS_SKIP);
 189                         break;
 190                 case FTS_DNR:                   /* Warn, chmod, continue. */
 191                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 192                         rval = 1;
 193                         break;
 194                 case FTS_DP:                    /* Already changed at FTS_D. */
 195                         continue;
 196                 case FTS_ERR:                   /* Warn, continue. */
 197                 case FTS_NS:
 198                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 199                         rval = 1;
 200                         continue;
 201                 case FTS_SL:                    /* Ignore. */
 202                 case FTS_SLNONE:
 203                         /*
 204                          * The only symlinks that end up here are ones that
 205                          * don't point to anything and ones that we found
 206                          * doing a physical walk.
 207                          */
 208                         if (!hflag)
 209                                 continue;
 210                         /* else */
 211                         /* FALLTHROUGH */
 212                 default:
 213                         break;
 214                 }
 215                 if ((*change_mode)(p->fts_accpath,
 216                     set ? getmode(set, p->fts_statp->st_mode) : mval)
 217                     && !fflag) {
 218                         warn("%s", p->fts_path);
 219                         rval = 1;
 220                 }
 221         }
 222         if (errno) {
 223                 err(EXIT_FAILURE, "fts_read");
 224                 /* NOTREACHED */
 225         }
 226         exit(rval);
 227         /* NOTREACHED */
 228 }
 229
 230 static void
 231 usage(void)
 232 {
 233         (void)fprintf(stderr,
 234             "Usage: %s [-R [-H | -L | -P]] [-fh] mode file ...\n"
 235             "\t%s [-R [-H | -L | -P]] [-fh] --reference=rfile file ...\n",
 236             getprogname(), getprogname());
 237         exit(1);
 238         /* NOTREACHED */
 239 }