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