sbin/chown/chown.c

   1 /*      $NetBSD: chown.c,v 1.8 2012/10/24 01:12:51 enami Exp $  */
   2
   3 /*
   4  * Copyright (c) 1988, 1993, 1994, 2003
   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("@(#) Copyright (c) 1988, 1993, 1994, 2003\
  35  The Regents of the University of California.  All rights reserved.");
  36 #endif /* not lint */
  37
  38 #ifndef lint
  39 #if 0
  40 static char sccsid[] = "@(#)chown.c     8.8 (Berkeley) 4/4/94";
  41 #else
  42 __RCSID("$NetBSD: chown.c,v 1.8 2012/10/24 01:12:51 enami Exp $");
  43 #endif
  44 #endif /* not lint */
  45
  46 #include <sys/types.h>
  47 #include <sys/stat.h>
  48
  49 #include <ctype.h>
  50 #include <dirent.h>
  51 #include <err.h>
  52 #include <errno.h>
  53 #include <locale.h>
  54 #include <fts.h>
  55 #include <grp.h>
  56 #include <pwd.h>
  57 #include <stdio.h>
  58 #include <stdlib.h>
  59 #include <string.h>
  60 #include <unistd.h>
  61 #include <getopt.h>
  62
  63 static void     a_gid(const char *);
  64 static void     a_uid(const char *);
  65 static id_t     id(const char *, const char *);
  66 __dead static void      usage(void);
  67
  68 static uid_t uid;
  69 static gid_t gid;
  70 static int ischown;
  71 static const char *myname;
  72
  73 struct option chown_longopts[] = {
  74         { "reference",          required_argument,      0,
  75                                                 1 },
  76         { NULL,                 0,                      0,
  77                                                 0 },
  78 };
  79
  80 int
  81 main(int argc, char **argv)
  82 {
  83         FTS *ftsp;
  84         FTSENT *p;
  85         int Hflag, Lflag, Rflag, ch, fflag, fts_options, hflag, rval, vflag;
  86         char *cp, *reference;
  87         int (*change_owner)(const char *, uid_t, gid_t);
  88
  89         setprogname(*argv);
  90
  91         (void)setlocale(LC_ALL, "");
  92
  93         myname = getprogname();
  94         ischown = (myname[2] == 'o');
  95         reference = NULL;
  96
  97         Hflag = Lflag = Rflag = fflag = hflag = vflag = 0;
  98         while ((ch = getopt_long(argc, argv, "HLPRfhv",
  99             chown_longopts, NULL)) != -1)
 100                 switch (ch) {
 101                 case 1:
 102                         reference = optarg;
 103                         break;
 104                 case 'H':
 105                         Hflag = 1;
 106                         Lflag = 0;
 107                         break;
 108                 case 'L':
 109                         Lflag = 1;
 110                         Hflag = 0;
 111                         break;
 112                 case 'P':
 113                         Hflag = Lflag = 0;
 114                         break;
 115                 case 'R':
 116                         Rflag = 1;
 117                         break;
 118                 case 'f':
 119                         fflag = 1;
 120                         break;
 121                 case 'h':
 122                         /*
 123                          * In System V the -h option causes chown/chgrp to
 124                          * change the owner/group of the symbolic link.
 125                          * 4.4BSD's symbolic links didn't have owners/groups,
 126                          * so it was an undocumented noop.
 127                          * In NetBSD 1.3, lchown(2) is introduced.
 128                          */
 129                         hflag = 1;
 130                         break;
 131                 case 'v':
 132                         vflag = 1;
 133                         break;
 134                 case '?':
 135                 default:
 136                         usage();
 137                 }
 138         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                         fts_options |= FTS_COMFOLLOW;
 148                 if (Lflag) {
 149                         if (hflag)
 150                                 errx(EXIT_FAILURE,
 151                                     "the -L and -h options "
 152                                     "may not be specified together.");
 153                         fts_options &= ~FTS_PHYSICAL;
 154                         fts_options |= FTS_LOGICAL;
 155                 }
 156         } else if (!hflag)
 157                 fts_options |= FTS_COMFOLLOW;
 158
 159         uid = (uid_t)-1;
 160         gid = (gid_t)-1;
 161         if (reference == NULL) {
 162                 if (ischown) {
 163                         if ((cp = strchr(*argv, ':')) != NULL) {
 164                                 *cp++ = '\0';
 165                                 a_gid(cp);
 166                         }
 167 #ifdef SUPPORT_DOT
 168                         else if ((cp = strrchr(*argv, '.')) != NULL) {
 169                                 if (uid_from_user(*argv, &uid) == -1) {
 170                                         *cp++ = '\0';
 171                                         a_gid(cp);
 172                                 }
 173                         }
 174 #endif
 175                         a_uid(*argv);
 176                 } else
 177                         a_gid(*argv);
 178                 argv++;
 179         } else {
 180                 struct stat st;
 181
 182                 if (stat(reference, &st) == -1)
 183                         err(EXIT_FAILURE, "Cannot stat `%s'", reference);
 184                 if (ischown)
 185                         uid = st.st_uid;
 186                 gid = st.st_gid;
 187         }
 188
 189         if ((ftsp = fts_open(argv, fts_options, NULL)) == NULL)
 190                 err(EXIT_FAILURE, "fts_open");
 191
 192         for (rval = EXIT_SUCCESS; (p = fts_read(ftsp)) != NULL;) {
 193                 change_owner = chown;
 194                 switch (p->fts_info) {
 195                 case FTS_D:
 196                         if (!Rflag)             /* Change it at FTS_DP. */
 197                                 fts_set(ftsp, p, FTS_SKIP);
 198                         continue;
 199                 case FTS_DNR:                   /* Warn, chown, continue. */
 200                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 201                         rval = EXIT_FAILURE;
 202                         break;
 203                 case FTS_ERR:                   /* Warn, continue. */
 204                 case FTS_NS:
 205                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 206                         rval = EXIT_FAILURE;
 207                         continue;
 208                 case FTS_SL:                    /* Ignore unless -h. */
 209                         /*
 210                          * All symlinks we found while doing a physical
 211                          * walk end up here.
 212                          */
 213                         if (!hflag)
 214                                 continue;
 215                         /*
 216                          * Note that if we follow a symlink, fts_info is
 217                          * not FTS_SL but FTS_F or whatever.  And we should
 218                          * use lchown only for FTS_SL and should use chown
 219                          * for others.
 220                          */
 221                         change_owner = lchown;
 222                         break;
 223                 case FTS_SLNONE:                /* Ignore. */
 224                         /*
 225                          * The only symlinks that end up here are ones that
 226                          * don't point to anything.  Note that if we are
 227                          * doing a phisycal walk, we never reach here unless
 228                          * we asked to follow explicitly.
 229                          */
 230                         continue;
 231                 default:
 232                         break;
 233                 }
 234
 235                 if ((*change_owner)(p->fts_accpath, uid, gid) && !fflag) {
 236                         warn("%s", p->fts_path);
 237                         rval = EXIT_FAILURE;
 238                 } else {
 239                         if (vflag)
 240                                 printf("%s\n", p->fts_path);
 241                 }
 242         }
 243         if (errno)
 244                 err(EXIT_FAILURE, "fts_read");
 245         exit(rval);
 246         /* NOTREACHED */
 247 }
 248
 249 static void
 250 a_gid(const char *s)
 251 {
 252         struct group *gr;
 253
 254         if (*s == '\0')                 /* Argument was "uid[:.]". */
 255                 return;
 256         gr = *s == '#' ? NULL : getgrnam(s);
 257         if (gr == NULL)
 258                 gid = id(s, "group");
 259         else
 260                 gid = gr->gr_gid;
 261         return;
 262 }
 263
 264 static void
 265 a_uid(const char *s)
 266 {
 267         if (*s == '\0')                 /* Argument was "[:.]gid". */
 268                 return;
 269         if (*s == '#' || uid_from_user(s, &uid) == -1) {
 270                 uid = id(s, "user");
 271         }
 272         return;
 273 }
 274
 275 static id_t
 276 id(const char *name, const char *type)
 277 {
 278         id_t val;
 279         char *ep;
 280
 281         errno = 0;
 282         if (*name == '#')
 283                 name++;
 284         val = (id_t)strtoul(name, &ep, 10);
 285         if (errno)
 286                 err(EXIT_FAILURE, "%s", name);
 287         if (*ep != '\0')
 288                 errx(EXIT_FAILURE, "%s: invalid %s name", name, type);
 289         return (val);
 290 }
 291
 292 static void
 293 usage(void)
 294 {
 295
 296         (void)fprintf(stderr,
 297             "Usage: %s [-R [-H | -L | -P]] [-fhv] %s file ...\n"
 298             "\t%s [-R [-H | -L | -P]] [-fhv] --reference=rfile file ...\n",
 299             myname, ischown ? "owner:group|owner|:group" : "group",
 300             myname);
 301         exit(EXIT_FAILURE);
 302 }