usr.sbin/chown/chown.c

   1 /*      $NetBSD: chown.c,v 1.31 2005/03/16 02:55:10 xtraeme 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 1.31 2005/03/16 02:55:10 xtraeme 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
  62 static void     a_gid(const char *);
  63 static void     a_uid(const char *);
  64 static id_t     id(const char *, const char *);
  65 static void     usage(void);
  66
  67 static uid_t uid;
  68 static gid_t gid;
  69 static int ischown;
  70 static char *myname;
  71
  72 int
  73 main(int argc, char **argv)
  74 {
  75         FTS *ftsp;
  76         FTSENT *p;
  77         int Hflag, Lflag, Rflag, ch, fflag, fts_options, hflag, rval, vflag;
  78         char *cp;
  79         int (*change_owner)(const char *, uid_t, gid_t);
  80
  81         (void)setlocale(LC_ALL, "");
  82
  83         myname = (cp = strrchr(*argv, '/')) ? cp + 1 : *argv;
  84         ischown = (myname[2] == 'o');
  85
  86         Hflag = Lflag = Rflag = fflag = hflag = vflag = 0;
  87         while ((ch = getopt(argc, argv, "HLPRfhv")) != -1)
  88                 switch (ch) {
  89                 case 'H':
  90                         Hflag = 1;
  91                         Lflag = 0;
  92                         break;
  93                 case 'L':
  94                         Lflag = 1;
  95                         Hflag = 0;
  96                         break;
  97                 case 'P':
  98                         Hflag = Lflag = 0;
  99                         break;
 100                 case 'R':
 101                         Rflag = 1;
 102                         break;
 103                 case 'f':
 104                         fflag = 1;
 105                         break;
 106                 case 'h':
 107                         /*
 108                          * In System V the -h option causes chown/chgrp to
 109                          * change the owner/group of the symbolic link.
 110                          * 4.4BSD's symbolic links didn't have owners/groups,
 111                          * so it was an undocumented noop.
 112                          * In NetBSD 1.3, lchown(2) is introduced.
 113                          */
 114                         hflag = 1;
 115                         break;
 116                 case 'v':
 117                         vflag = 1;
 118                         break;
 119                 case '?':
 120                 default:
 121                         usage();
 122                 }
 123         argv += optind;
 124         argc -= optind;
 125
 126         if (argc < 2)
 127                 usage();
 128
 129         fts_options = FTS_PHYSICAL;
 130         if (Rflag) {
 131                 if (Hflag)
 132                         fts_options |= FTS_COMFOLLOW;
 133                 if (Lflag) {
 134                         if (hflag)
 135                                 errx(EXIT_FAILURE,
 136                                     "the -L and -h options "
 137                                     "may not be specified together.");
 138                         fts_options &= ~FTS_PHYSICAL;
 139                         fts_options |= FTS_LOGICAL;
 140                 }
 141         } else if (!hflag)
 142                 fts_options |= FTS_COMFOLLOW;
 143
 144         uid = (uid_t)-1;
 145         gid = (gid_t)-1;
 146         if (ischown) {
 147                 if ((cp = strchr(*argv, ':')) != NULL) {
 148                         *cp++ = '\0';
 149                         a_gid(cp);
 150                 }
 151 #ifdef SUPPORT_DOT
 152                 else if ((cp = strrchr(*argv, '.')) != NULL) {
 153                         if (uid_from_user(*argv, &uid) == -1) {
 154                                 *cp++ = '\0';
 155                                 a_gid(cp);
 156                         }
 157                 }
 158 #endif
 159                 a_uid(*argv);
 160         } else
 161                 a_gid(*argv);
 162
 163         if ((ftsp = fts_open(++argv, fts_options, NULL)) == NULL)
 164                 err(EXIT_FAILURE, "fts_open");
 165
 166         for (rval = EXIT_SUCCESS; (p = fts_read(ftsp)) != NULL;) {
 167                 change_owner = chown;
 168                 switch (p->fts_info) {
 169                 case FTS_D:
 170                         if (!Rflag)             /* Change it at FTS_DP. */
 171                                 fts_set(ftsp, p, FTS_SKIP);
 172                         continue;
 173                 case FTS_DNR:                   /* Warn, chown, continue. */
 174                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 175                         rval = EXIT_FAILURE;
 176                         break;
 177                 case FTS_ERR:                   /* Warn, continue. */
 178                 case FTS_NS:
 179                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 180                         rval = EXIT_FAILURE;
 181                         continue;
 182                 case FTS_SL:                    /* Ignore unless -h. */
 183                         /*
 184                          * All symlinks we found while doing a physical
 185                          * walk end up here.
 186                          */
 187                         if (!hflag)
 188                                 continue;
 189                         /*
 190                          * Note that if we follow a symlink, fts_info is
 191                          * not FTS_SL but FTS_F or whatever.  And we should
 192                          * use lchown only for FTS_SL and should use chown
 193                          * for others.
 194                          */
 195                         change_owner = lchown;
 196                         break;
 197                 case FTS_SLNONE:                /* Ignore. */
 198                         /*
 199                          * The only symlinks that end up here are ones that
 200                          * don't point to anything.  Note that if we are
 201                          * doing a phisycal walk, we never reach here unless
 202                          * we asked to follow explicitly.
 203                          */
 204                         continue;
 205                 default:
 206                         break;
 207                 }
 208
 209                 if ((*change_owner)(p->fts_accpath, uid, gid) && !fflag) {
 210                         warn("%s", p->fts_path);
 211                         rval = EXIT_FAILURE;
 212                 } else {
 213                         if (vflag)
 214                                 printf("%s\n", p->fts_path);
 215                 }
 216         }
 217         if (errno)
 218                 err(EXIT_FAILURE, "fts_read");
 219         exit(rval);
 220         /* NOTREACHED */
 221 }
 222
 223 static void
 224 a_gid(const char *s)
 225 {
 226         struct group *gr;
 227
 228         if (*s == '\0')                 /* Argument was "uid[:.]". */
 229                 return;
 230         gr = *s == '#' ? NULL : getgrnam(s);
 231         if (gr == NULL)
 232                 gid = id(s, "group");
 233         else
 234                 gid = gr->gr_gid;
 235         return;
 236 }
 237
 238 static void
 239 a_uid(const char *s)
 240 {
 241         if (*s == '\0')                 /* Argument was "[:.]gid". */
 242                 return;
 243         if (*s == '#' || uid_from_user(s, &uid) == -1) {
 244                 uid = id(s, "user");
 245         }
 246         return;
 247 }
 248
 249 static id_t
 250 id(const char *name, const char *type)
 251 {
 252         id_t val;
 253         char *ep;
 254
 255         errno = 0;
 256         if (*name == '#')
 257                 name++;
 258         val = (id_t)strtoul(name, &ep, 10);
 259         if (errno)
 260                 err(EXIT_FAILURE, "%s", name);
 261         if (*ep != '\0')
 262                 errx(EXIT_FAILURE, "%s: invalid %s name", name, type);
 263         return (val);
 264 }
 265
 266 static void
 267 usage(void)
 268 {
 269
 270         (void)fprintf(stderr,
 271             "usage: %s [-R [-H | -L | -P]] [-fhv] %s file ...\n",
 272             myname, ischown ? "[owner][:group]" : "group");
 273         exit(EXIT_FAILURE);
 274 }