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. 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 char const copyright[] =
  36 "@(#) Copyright (c) 1989, 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[] = "@(#)chmod.c     8.8 (Berkeley) 4/1/94";
  43 #endif
  44 #endif /* not lint */
  45 #include <sys/cdefs.h>
  46 __RCSID("$FreeBSD: src/bin/chmod/chmod.c,v 1.27 2002/08/04 05:29:13 obrien Exp $");
  47
  48 #include <sys/types.h>
  49 #include <sys/stat.h>
  50
  51 #include <err.h>
  52 #include <errno.h>
  53 #include <fts.h>
  54 #include <limits.h>
  55 #include <stdio.h>
  56 #include <stdlib.h>
  57 #include <string.h>
  58 #include <unistd.h>
  59
  60 #ifdef __APPLE__
  61 #include "chmod_acl.h"
  62
  63 #endif /*__APPLE__*/
  64
  65 int fflag = 0;
  66
  67 int main(int, char *[]);
  68 void usage(void);
  69
  70 int
  71 main(int argc, char *argv[])
  72 {
  73         FTS *ftsp = NULL;
  74         FTSENT *p = NULL;
  75         mode_t *set = NULL;
  76         long val = 0;
  77         int oct = 0;
  78         int Hflag, Lflag, Pflag, Rflag, ch, fts_options, hflag, rval;
  79         int vflag;
  80         char *ep, *mode;
  81         mode_t newmode, omode;
  82 #ifdef __APPLE__
  83         unsigned int acloptflags = 0;
  84         long aclpos = -1;
  85         int inheritance_level = 0;
  86         int index = 0;
  87         size_t acloptlen = 0;
  88         int ace_arg_not_required = 0;
  89         acl_t acl_input = NULL;
  90 #endif /* __APPLE__*/
  91         int (*change_mode)(const char *, mode_t);
  92
  93         set = NULL;
  94         omode = 0;
  95         Hflag = Lflag = Pflag = Rflag = fflag = hflag = vflag = 0;
  96 #ifndef __APPLE__
  97         while ((ch = getopt(argc, argv, "HLPRXfghorstuvwx")) != -1)
  98 #else
  99         while ((ch = getopt(argc, argv, "ACEHILNPRVXafghinorstuvwx")) != -1)
 100 #endif
 101                 switch (ch) {
 102                 case 'H':
 103                         Hflag = 1;
 104                         Lflag = 0;
 105                         Pflag = 0;
 106                         break;
 107                 case 'L':
 108                         Lflag = 1;
 109                         Hflag = 0;
 110                         Pflag = 0;
 111                         break;
 112                 case 'P':
 113                         Hflag = Lflag = 0;
 114                         Pflag = 1;
 115                         break;
 116                 case 'R':
 117                         Rflag = 1;
 118                         break;
 119                 case 'f':
 120                         fflag = 1;
 121                         break;
 122                 case 'h':
 123                         /*
 124                          * In System V (and probably POSIX.2) the -h option
 125                          * causes chmod to change the mode of the symbolic
 126                          * link.  4.4BSD's symbolic links didn't have modes,
 127                          * so it was an undocumented noop.  In FreeBSD 3.0,
 128                          * lchmod(2) is introduced and this option does real
 129                          * work.
 130                          */
 131                         hflag = 1;
 132                         break;
 133 #ifdef __APPLE__
 134                 case 'a':
 135                         if (argv[optind - 1][0] == '-' &&
 136                             argv[optind - 1][1] == ch)
 137                                 --optind;
 138                         goto done;
 139                 case 'A':
 140 //                      acloptflags |= ACL_FLAG | ACL_TO_STDOUT;
 141 //                      ace_arg_not_required = 1;
 142                         errx(1, "-A not implemented");
 143                         goto done;
 144                 case 'E':
 145                         acloptflags |= ACL_FLAG | ACL_FROM_STDIN;
 146                         goto done;
 147                 case 'C':
 148                         acloptflags |= ACL_FLAG | ACL_CHECK_CANONICITY;
 149                         ace_arg_not_required = 1;
 150                         goto done;
 151                 case 'i':
 152                         acloptflags |= ACL_FLAG | ACL_REMOVE_INHERIT_FLAG;
 153                         ace_arg_not_required = 1;
 154                         goto done;
 155                 case 'I':
 156                         acloptflags |= ACL_FLAG | ACL_REMOVE_INHERITED_ENTRIES;
 157                         ace_arg_not_required = 1;
 158                         goto done;
 159                 case 'n':
 160                         acloptflags |= ACL_FLAG | ACL_NO_TRANSLATE;
 161                         break;
 162                 case 'N':
 163                         acloptflags |= ACL_FLAG | ACL_CLEAR_FLAG;
 164                         ace_arg_not_required = 1;
 165                         goto done;
 166                 case 'V':
 167 //                      acloptflags |= ACL_FLAG | ACL_INVOKE_EDITOR;
 168 //                      ace_arg_not_required = 1;
 169                         errx(1, "-V not implemented");
 170                         goto done;
 171 #endif /* __APPLE__ */
 172                 /*
 173                  * XXX
 174                  * "-[rwx]" are valid mode commands.  If they are the entire
 175                  * argument, getopt has moved past them, so decrement optind.
 176                  * Regardless, we're done argument processing.
 177                  */
 178                 case 'g': case 'o': case 'r': case 's':
 179                 case 't': case 'u': case 'w': case 'X': case 'x':
 180                         if (argv[optind - 1][0] == '-' &&
 181                             argv[optind - 1][1] == ch &&
 182                             argv[optind - 1][2] == '\0')
 183                                 --optind;
 184                         goto done;
 185                 case 'v':
 186                         vflag++;
 187                         break;
 188                 case '?':
 189                 default:
 190                         usage();
 191                 }
 192 done:   argv += optind;
 193         argc -= optind;
 194
 195 #ifdef __APPLE__
 196         if (argc < ((acloptflags & ACL_FLAG) ? 1 : 2))
 197                 usage();
 198         if (!Rflag && (Hflag || Lflag || Pflag))
 199                 warnx("options -H, -L, -P only useful with -R");
 200 #else  /* !__APPLE__ */
 201         if (argc < 2)
 202                 usage();
 203 #endif  /* __APPLE__ */
 204
 205 #ifdef __APPLE__
 206         if (!(acloptflags & ACL_FLAG) && ((acloptlen = strlen(argv[0])) > 1) && (argv[0][1] == 'a')) {
 207                 acloptflags |= ACL_FLAG;
 208                 switch (argv[0][0]) {
 209                 case '+':
 210                         acloptflags |= ACL_SET_FLAG;
 211                         break;
 212                 case '-':
 213                         acloptflags |= ACL_DELETE_FLAG;
 214                         break;
 215                 case '=':
 216                         acloptflags |= ACL_REWRITE_FLAG;
 217                         break;
 218                 default:
 219                         acloptflags &= ~ACL_FLAG;
 220                         goto apnoacl;
 221                 }
 222
 223                 if (argc < 3)
 224                         usage();
 225
 226                 if (acloptlen > 2) {
 227                         for (index = 2; index < acloptlen; index++) {
 228                                 switch (argv[0][index]) {
 229                                 case '#':
 230                                         acloptflags |= ACL_ORDER_FLAG;
 231
 232                                         if (argc < ((acloptflags & ACL_DELETE_FLAG)
 233                                                     ? 3 : 4))
 234                                                 usage();
 235                                         argv++;
 236                                         argc--;
 237                                         errno = 0;
 238                                         aclpos = strtol(argv[0], &ep, 0);
 239
 240                                         if (aclpos > ACL_MAX_ENTRIES
 241                                             || aclpos < 0)
 242                                                 errno = ERANGE;
 243                                         if (errno || *ep)
 244                                                 errx(1, "Invalid ACL entry number: %ld", aclpos);
 245                                         if (acloptflags & ACL_DELETE_FLAG)
 246                                                 ace_arg_not_required = 1;
 247
 248                                         goto apdone;
 249                                 case 'i':
 250                                         acloptflags |= ACL_INHERIT_FLAG;
 251                                         /* The +aii.. syntax to specify
 252                                          * inheritance level is rather unwieldy,
 253                                          * find an alternative.
 254                                          */
 255                                         inheritance_level++;
 256                                         if (inheritance_level > 1)
 257                                                 warnx("Inheritance across more than one generation is not currently supported");
 258                                         if (inheritance_level >= MAX_INHERITANCE_LEVEL)
 259                                                 goto apdone;
 260                                         break;
 261                                 default:
 262                                         errno = EINVAL;
 263                                         usage();
 264                                 }
 265                         }
 266                 }
 267 apdone:
 268                 argv++;
 269                 argc--;
 270         }
 271 apnoacl:
 272 #endif /*__APPLE__*/
 273
 274         if (Rflag) {
 275                 fts_options = FTS_PHYSICAL;
 276                 if (hflag)
 277                         errx(1,
 278                 "the -R and -h options may not be specified together.");
 279                 if (Hflag)
 280                         fts_options |= FTS_COMFOLLOW;
 281                 if (Lflag) {
 282                         fts_options &= ~FTS_PHYSICAL;
 283                         fts_options |= FTS_LOGICAL;
 284                 }
 285         } else
 286                 fts_options = hflag ? FTS_PHYSICAL : FTS_LOGICAL;
 287
 288         if (hflag)
 289                 change_mode = lchmod;
 290         else
 291                 change_mode = chmod;
 292 #ifdef __APPLE__
 293         if (acloptflags & ACL_FROM_STDIN) {
 294                 ssize_t readval = 0;
 295                 size_t readtotal = 0;
 296
 297                 mode = (char *) malloc(MAX_ACL_TEXT_SIZE);
 298
 299                 if (mode == NULL)
 300                         err(1, "Unable to allocate mode string");
 301                 /* Read the ACEs from STDIN */
 302                 do {
 303                         readtotal += readval;
 304                         readval = read(STDIN_FILENO, mode + readtotal,
 305                                        MAX_ACL_TEXT_SIZE);
 306                 } while ((readval > 0) && (readtotal <= MAX_ACL_TEXT_SIZE));
 307
 308                 if (0 == readtotal)
 309                         errx(1, "-E specified, but read from STDIN failed");
 310                 else
 311                         mode[readtotal - 1] = '\0';
 312                 --argv;
 313         }
 314         else
 315 #endif /* __APPLE */
 316                 mode = *argv;
 317
 318 #ifdef __APPLE__
 319         if ((acloptflags & ACL_FLAG)) {
 320
 321                 /* Are we deleting by entry number, verifying
 322                  * canonicity or performing some other operation that
 323                  * does not require an input entry? If so, there's no
 324                  * entry to convert.
 325                  */
 326                 if (ace_arg_not_required) {
 327                         --argv;
 328                 }
 329                 else {
 330                         /* Parse the text into an ACL*/
 331                         acl_input = parse_acl_entries(mode);
 332                         if (acl_input == NULL) {
 333                                 errx(1, "Invalid ACL specification: %s", mode);
 334                         }
 335                 }
 336         }
 337         else {
 338 #endif /* __APPLE__*/
 339                 if (*mode >= '0' && *mode <= '7') {
 340                         errno = 0;
 341                         val = strtol(mode, &ep, 8);
 342                         if (val > USHRT_MAX || val < 0)
 343                                 errno = ERANGE;
 344                         if (errno)
 345                                 err(1, "Invalid file mode: %s", mode);
 346                         if (*ep)
 347                                 errx(1, "Invalid file mode: %s", mode);
 348                         omode = (mode_t)val;
 349                         oct = 1;
 350                 } else {
 351                         if ((set = setmode(mode)) == NULL)
 352                                 errx(1, "Invalid file mode: %s", mode);
 353                         oct = 0;
 354                 }
 355 #ifdef __APPLE__
 356         }
 357 #endif /* __APPLE__*/
 358         if ((ftsp = fts_open(++argv, fts_options, 0)) == NULL)
 359                 err(1, "fts_open");
 360         for (rval = 0; (p = fts_read(ftsp)) != NULL;) {
 361                 switch (p->fts_info) {
 362                 case FTS_D:
 363                         if (!Rflag)
 364                                 (void)fts_set(ftsp, p, FTS_SKIP);
 365                         break;
 366                 case FTS_DNR:                   /* Warn, chmod, continue. */
 367                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 368                         rval = 1;
 369                         break;
 370                 case FTS_DP:                    /* Already changed at FTS_D. */
 371                         continue;
 372                 case FTS_NS:
 373                         if (acloptflags & ACL_FLAG) /* don't need stat for -N */
 374                                 break;
 375                 case FTS_ERR:                   /* Warn, continue. */
 376                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 377                         rval = 1;
 378                         continue;
 379                 case FTS_SL:                    /* Ignore. */
 380                 case FTS_SLNONE:
 381                         /*
 382                          * The only symlinks that end up here are ones that
 383                          * don't point to anything and ones that we found
 384                          * doing a physical walk.
 385                          */
 386                         if (!hflag)
 387                                 continue;
 388                         /* else */
 389                         /* FALLTHROUGH */
 390                 default:
 391                         break;
 392                 }
 393 #ifdef __APPLE__
 394 /* If an ACL manipulation option was specified, manipulate */
 395                 if (acloptflags & ACL_FLAG)     {
 396                         if (0 != modify_file_acl(acloptflags, p->fts_accpath, acl_input, (int)aclpos, inheritance_level, !hflag))
 397                                 rval = 1;
 398                 }
 399                 else {
 400 #endif /* __APPLE__ */
 401                         newmode = oct ? omode : getmode(set, p->fts_statp->st_mode);
 402                         if ((newmode & ALLPERMS) == (p->fts_statp->st_mode & ALLPERMS))
 403                                 continue;
 404                         if ((*change_mode)(p->fts_accpath, newmode) && !fflag) {
 405                                 warn("Unable to change file mode on %s", p->fts_path);
 406                                 rval = 1;
 407                         } else {
 408                                 if (vflag) {
 409                                         (void)printf("%s", p->fts_accpath);
 410
 411                                         if (vflag > 1) {
 412                                                 char m1[12], m2[12];
 413
 414                                                 strmode(p->fts_statp->st_mode, m1);
 415                                                 strmode((p->fts_statp->st_mode &
 416                                                          S_IFMT) | newmode, m2);
 417
 418                                                 (void)printf(": 0%o [%s] -> 0%o [%s]",
 419                                                              p->fts_statp->st_mode, m1,
 420                                             (p->fts_statp->st_mode & S_IFMT) |
 421                                                              newmode, m2);
 422                                         }
 423                                         (void)printf("\n");
 424                                 }
 425
 426                         }
 427 #ifdef __APPLE__
 428                 }
 429 #endif /* __APPLE__*/
 430         }
 431         if (errno)
 432                 err(1, "fts_read");
 433 #ifdef __APPLE__
 434         if (acl_input)
 435                 acl_free(acl_input);
 436         if (mode && (acloptflags & ACL_FROM_STDIN))
 437                 free(mode);
 438
 439 #endif /* __APPLE__ */
 440         if (set)
 441                 free(set);
 442         exit(rval);
 443 }
 444
 445 void
 446 usage(void)
 447 {
 448 #ifdef __APPLE__
 449         (void)fprintf(stderr,
 450                       "usage:\tchmod [-fhv] [-R [-H | -L | -P]] [-a | +a | =a  [i][# [ n]]] mode|entry file ...\n"
 451                       "\tchmod [-fhv] [-R [-H | -L | -P]] [-E | -C | -N | -i | -I] file ...\n"); /* add -A and -V when implemented */
 452 #else
 453         (void)fprintf(stderr,
 454             "usage: chmod [-fhv] [-R [-H | -L | -P]] mode file ...\n");
 455 #endif /* __APPLE__ */
 456         exit(1);
 457 }