chown/chown.c

   1 /*
   2  * Copyright (c) 1988, 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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifndef lint
  35 static const char copyright[] =
  36 "@(#) Copyright (c) 1988, 1993, 1994\n\
  37         The Regents of the University of California.  All rights reserved.\n";
  38 #endif /* not lint */
  39
  40 #ifndef lint
  41 #if 0
  42 static char sccsid[] = "@(#)chown.c     8.8 (Berkeley) 4/4/94";
  43 #endif
  44 #endif /* not lint */
  45
  46 #include <sys/cdefs.h>
  47 __RCSID("$FreeBSD: src/usr.sbin/chown/chown.c,v 1.24 2002/07/17 16:22:24 dwmalone Exp $");
  48
  49 #include <sys/param.h>
  50 #include <sys/stat.h>
  51
  52 #include <err.h>
  53 #include <errno.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 void    a_gid(const char *);
  63 void    a_uid(const char *);
  64 void    chownerr(const char *);
  65 u_long  id(const char *, const char *);
  66 void    usage(void);
  67
  68 uid_t uid;
  69 gid_t gid;
  70 int ischown;
  71 const char *gname;
  72
  73 int
  74 main(int argc, char **argv)
  75 {
  76         FTS *ftsp;
  77         FTSENT *p;
  78         int Hflag, Lflag, Rflag, fflag, hflag, vflag;
  79         int ch, fts_options, rval;
  80         char *cp;
  81
  82         cp = strrchr(argv[0], '/');
  83         cp = (cp != NULL) ? cp + 1 : argv[0];
  84         ischown = (strcmp(cp, "chown") == 0);
  85
  86         Hflag = Lflag = Rflag = fflag = hflag = vflag = 0;
  87 #ifndef __APPLE__
  88         while ((ch = getopt(argc, argv, "HLPRfhv")) != -1)
  89 #else
  90         while ((ch = getopt(argc, argv, "HLPRfv")) != -1)
  91 #endif
  92                 switch (ch) {
  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 #ifndef __APPLE__
 111                 case 'h':
 112                         hflag = 1;
 113                         break;
 114 #endif
 115                 case 'v':
 116                         vflag = 1;
 117                         break;
 118                 case '?':
 119                 default:
 120                         usage();
 121                 }
 122         argv += optind;
 123         argc -= optind;
 124
 125         if (argc < 2)
 126                 usage();
 127
 128         if (Rflag) {
 129                 fts_options = FTS_PHYSICAL;
 130                 if (hflag && (Hflag || Lflag))
 131                         errx(1, "the -R%c and -h options may not be "
 132                             "specified together", Hflag ? 'H' : 'L');
 133                 if (Hflag)
 134                         fts_options |= FTS_COMFOLLOW;
 135                 else if (Lflag) {
 136                         fts_options &= ~FTS_PHYSICAL;
 137                         fts_options |= FTS_LOGICAL;
 138                 }
 139         } else
 140                 fts_options = hflag ? FTS_PHYSICAL : FTS_LOGICAL;
 141
 142         uid = (uid_t)-1;
 143         gid = (gid_t)-1;
 144         if (ischown) {
 145                 if ((cp = strchr(*argv, ':')) != NULL) {
 146                         *cp++ = '\0';
 147                         a_gid(cp);
 148                 }
 149 #ifdef SUPPORT_DOT
 150                 else if ((cp = strchr(*argv, '.')) != NULL) {
 151                         warnx("separation of user and group with a period is deprecated");
 152                         *cp++ = '\0';
 153                         a_gid(cp);
 154                 }
 155 #endif
 156                 a_uid(*argv);
 157         } else
 158                 a_gid(*argv);
 159
 160         if ((ftsp = fts_open(++argv, fts_options, 0)) == NULL)
 161                 err(1, NULL);
 162
 163         for (rval = 0; (p = fts_read(ftsp)) != NULL;) {
 164                 switch (p->fts_info) {
 165                 case FTS_D:                     /* Change it at FTS_DP. */
 166                         if (!Rflag)
 167                                 fts_set(ftsp, p, FTS_SKIP);
 168                         continue;
 169                 case FTS_DNR:                   /* Warn, chown. */
 170                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 171                         rval = 1;
 172                         break;
 173                 case FTS_ERR:                   /* Warn, continue. */
 174                 case FTS_NS:
 175                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 176                         rval = 1;
 177                         continue;
 178                 case FTS_SL:
 179                 case FTS_SLNONE:
 180                         /*
 181                          * The only symlinks that end up here are ones that
 182                          * don't point to anything and ones that we found
 183                          * doing a physical walk.
 184                          */
 185                         if (hflag)
 186                                 break;
 187                         else
 188                                 continue;
 189                 default:
 190                         break;
 191                 }
 192                 if ((uid == (uid_t)-1 || uid == p->fts_statp->st_uid) &&
 193                     (gid == (gid_t)-1 || gid == p->fts_statp->st_gid))
 194                         continue;
 195 #ifndef __APPLE__
 196                 if ((hflag ? lchown : chown)(p->fts_accpath, uid, gid) == -1) {
 197 #else
 198                 if (chown(p->fts_accpath, uid, gid) == -1) {
 199 #endif /* __APPLE__ */
 200                         if (!fflag) {
 201                                 chownerr(p->fts_path);
 202                                 rval = 1;
 203                         }
 204                 } else {
 205                         if (vflag)
 206                                 printf("%s\n", p->fts_path);
 207                 }
 208         }
 209         if (errno)
 210                 err(1, "fts_read");
 211         exit(rval);
 212 }
 213
 214 void
 215 a_gid(const char *s)
 216 {
 217         struct group *gr;
 218
 219         if (*s == '\0')                 /* Argument was "uid[:.]". */
 220                 return;
 221         gname = s;
 222         gid = ((gr = getgrnam(s)) != NULL) ? gr->gr_gid : id(s, "group");
 223 }
 224
 225 void
 226 a_uid(const char *s)
 227 {
 228         struct passwd *pw;
 229
 230         if (*s == '\0')                 /* Argument was "[:.]gid". */
 231                 return;
 232         uid = ((pw = getpwnam(s)) != NULL) ? pw->pw_uid : id(s, "user");
 233 }
 234
 235 u_long
 236 id(const char *name, const char *type)
 237 {
 238         u_long val;
 239         char *ep;
 240
 241         /*
 242          * XXX
 243          * We know that uid_t's and gid_t's are unsigned longs.
 244          */
 245         errno = 0;
 246         val = strtoul(name, &ep, 10);
 247         if (errno)
 248                 err(1, "%s", name);
 249         if (*ep != '\0')
 250                 errx(1, "%s: illegal %s name", name, type);
 251         return (val);
 252 }
 253
 254 void
 255 chownerr(const char *file)
 256 {
 257         static uid_t euid = -1;
 258         static int ngroups = -1;
 259         gid_t groups[NGROUPS_MAX];
 260
 261         /* Check for chown without being root. */
 262         if (errno != EPERM || (uid != (uid_t)-1 &&
 263             euid == (uid_t)-1 && (euid = geteuid()) != 0)) {
 264                 warn("%s", file);
 265                 return;
 266         }
 267
 268         /* Check group membership; kernel just returns EPERM. */
 269         if (gid != (gid_t)-1 && ngroups == -1 &&
 270             euid == (uid_t)-1 && (euid = geteuid()) != 0) {
 271                 ngroups = getgroups(NGROUPS_MAX, groups);
 272                 while (--ngroups >= 0 && gid != groups[ngroups]);
 273                 if (ngroups < 0) {
 274                         warnx("you are not a member of group %s", gname);
 275                         return;
 276                 }
 277         }
 278         warn("%s", file);
 279 }
 280
 281 void
 282 usage(void)
 283 {
 284
 285         if (ischown)
 286                 (void)fprintf(stderr, "%s\n%s\n",
 287                     "usage: chown [-fhv] [-R [-H | -L | -P]] owner[:group]"
 288                     " file ...",
 289                     "       chown [-fhv] [-R [-H | -L | -P]] :group file ...");
 290         else
 291                 (void)fprintf(stderr, "%s\n",
 292 #ifndef __APPLE__
 293                     "usage: chgrp [-fhv] [-R [-H | -L | -P]] group file ...");
 294 #else
 295                     "usage: chgrp [-fv] [-R [-H | -L | -P]] group file ...");
 296 #endif
 297         exit(1);
 298 }