file_cmds/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 #include <sys/cdefs.h>
  35 #ifndef lint
  36 __used static char const copyright[] =
  37 "@(#) Copyright (c) 1989, 1993, 1994\n\
  38         The Regents of the University of California.  All rights reserved.\n";
  39 #endif /* not lint */
  40
  41 #ifndef lint
  42 #if 0
  43 static char sccsid[] = "@(#)chmod.c     8.8 (Berkeley) 4/1/94";
  44 #endif
  45 #endif /* not lint */
  46 #include <sys/cdefs.h>
  47 __RCSID("$FreeBSD: src/bin/chmod/chmod.c,v 1.27 2002/08/04 05:29:13 obrien Exp $");
  48
  49 #include <sys/types.h>
  50 #include <sys/stat.h>
  51
  52 #include <err.h>
  53 #include <errno.h>
  54 #include <fts.h>
  55 #include <limits.h>
  56 #include <stdio.h>
  57 #include <stdlib.h>
  58 #include <string.h>
  59 #include <unistd.h>
  60
  61 #ifdef __APPLE__
  62 #include "chmod_acl.h"
  63
  64 #endif /*__APPLE__*/
  65
  66 int fflag = 0;
  67
  68 int main(int, char *[]);
  69 void usage(void);
  70
  71 int
  72 main(int argc, char *argv[])
  73 {
  74         FTS *ftsp = NULL;
  75         FTSENT *p = NULL;
  76         mode_t *set = NULL;
  77         long val = 0;
  78         int oct = 0;
  79         int Hflag, Lflag, Pflag, Rflag, ch, fts_options, hflag, rval;
  80         int vflag;
  81         char *ep, *mode;
  82         mode_t newmode, omode;
  83 #ifdef __APPLE__
  84         unsigned int acloptflags = 0;
  85         long aclpos = -1;
  86         int inheritance_level = 0;
  87         int index = 0;
  88         size_t acloptlen = 0;
  89         int ace_arg_not_required = 0;
  90         acl_t acl_input = NULL;
  91 #endif /* __APPLE__*/
  92         int (*change_mode)(const char *, mode_t);
  93
  94         set = NULL;
  95         omode = 0;
  96         Hflag = Lflag = Pflag = Rflag = fflag = hflag = vflag = 0;
  97 #ifndef __APPLE__
  98         while ((ch = getopt(argc, argv, "HLPRXfghorstuvwx")) != -1)
  99 #else
 100         while ((ch = getopt(argc, argv, "ACEHILNPRVXafghinorstuvwx")) != -1)
 101 #endif
 102                 switch (ch) {
 103                 case 'H':
 104                         Hflag = 1;
 105                         Lflag = 0;
 106                         Pflag = 0;
 107                         break;
 108                 case 'L':
 109                         Lflag = 1;
 110                         Hflag = 0;
 111                         Pflag = 0;
 112                         break;
 113                 case 'P':
 114                         Hflag = Lflag = 0;
 115                         Pflag = 1;
 116                         break;
 117                 case 'R':
 118                         Rflag = 1;
 119                         break;
 120                 case 'f':
 121                         fflag = 1;
 122                         break;
 123                 case 'h':
 124                         /*
 125                          * In System V (and probably POSIX.2) the -h option
 126                          * causes chmod to change the mode of the symbolic
 127                          * link.  4.4BSD's symbolic links didn't have modes,
 128                          * so it was an undocumented noop.  In FreeBSD 3.0,
 129                          * lchmod(2) is introduced and this option does real
 130                          * work.
 131                          */
 132                         hflag = 1;
 133                         break;
 134 #ifdef __APPLE__
 135                 case 'a':
 136                         if (argv[optind - 1][0] == '-' &&
 137                             argv[optind - 1][1] == ch)
 138                                 --optind;
 139                         goto done;
 140                 case 'A':
 141 //                      acloptflags |= ACL_FLAG | ACL_TO_STDOUT;
 142 //                      ace_arg_not_required = 1;
 143                         errx(1, "-A not implemented");
 144                         goto done;
 145                 case 'E':
 146                         acloptflags |= ACL_FLAG | ACL_FROM_STDIN;
 147                         goto done;
 148                 case 'C':
 149                         acloptflags |= ACL_FLAG | ACL_CHECK_CANONICITY;
 150                         ace_arg_not_required = 1;
 151                         goto done;
 152                 case 'i':
 153                         acloptflags |= ACL_FLAG | ACL_REMOVE_INHERIT_FLAG;
 154                         ace_arg_not_required = 1;
 155                         goto done;
 156                 case 'I':
 157                         acloptflags |= ACL_FLAG | ACL_REMOVE_INHERITED_ENTRIES;
 158                         ace_arg_not_required = 1;
 159                         goto done;
 160                 case 'n':
 161                         acloptflags |= ACL_FLAG | ACL_NO_TRANSLATE;
 162                         break;
 163                 case 'N':
 164                         acloptflags |= ACL_FLAG | ACL_CLEAR_FLAG;
 165                         ace_arg_not_required = 1;
 166                         goto done;
 167                 case 'V':
 168 //                      acloptflags |= ACL_FLAG | ACL_INVOKE_EDITOR;
 169 //                      ace_arg_not_required = 1;
 170                         errx(1, "-V not implemented");
 171                         goto done;
 172 #endif /* __APPLE__ */
 173                 /*
 174                  * XXX
 175                  * "-[rwx]" are valid mode commands.  If they are the entire
 176                  * argument, getopt has moved past them, so decrement optind.
 177                  * Regardless, we're done argument processing.
 178                  */
 179                 case 'g': case 'o': case 'r': case 's':
 180                 case 't': case 'u': case 'w': case 'X': case 'x':
 181                         if (argv[optind - 1][0] == '-' &&
 182                             argv[optind - 1][1] == ch &&
 183                             argv[optind - 1][2] == '\0')
 184                                 --optind;
 185                         goto done;
 186                 case 'v':
 187                         vflag++;
 188                         break;
 189                 case '?':
 190                 default:
 191                         usage();
 192                 }
 193 done:   argv += optind;
 194         argc -= optind;
 195
 196 #ifdef __APPLE__
 197         if (argc < ((acloptflags & ACL_FLAG) ? 1 : 2))
 198                 usage();
 199         if (!Rflag && (Hflag || Lflag || Pflag))
 200                 warnx("options -H, -L, -P only useful with -R");
 201 #else  /* !__APPLE__ */
 202         if (argc < 2)
 203                 usage();
 204 #endif  /* __APPLE__ */
 205
 206 #ifdef __APPLE__
 207         if (!(acloptflags & ACL_FLAG) && ((acloptlen = strlen(argv[0])) > 1) && (argv[0][1] == 'a')) {
 208                 acloptflags |= ACL_FLAG;
 209                 switch (argv[0][0]) {
 210                 case '+':
 211                         acloptflags |= ACL_SET_FLAG;
 212                         break;
 213                 case '-':
 214                         acloptflags |= ACL_DELETE_FLAG;
 215                         break;
 216                 case '=':
 217                         acloptflags |= ACL_REWRITE_FLAG;
 218                         break;
 219                 default:
 220                         acloptflags &= ~ACL_FLAG;
 221                         goto apnoacl;
 222                 }
 223
 224                 if (argc < 3)
 225                         usage();
 226
 227                 if (acloptlen > 2) {
 228                         for (index = 2; index < acloptlen; index++) {
 229                                 switch (argv[0][index]) {
 230                                 case '#':
 231                                         acloptflags |= ACL_ORDER_FLAG;
 232
 233                                         if (argc < ((acloptflags & ACL_DELETE_FLAG)
 234                                                     ? 3 : 4))
 235                                                 usage();
 236                                         argv++;
 237                                         argc--;
 238                                         errno = 0;
 239                                         aclpos = strtol(argv[0], &ep, 0);
 240
 241                                         if (aclpos > ACL_MAX_ENTRIES
 242                                             || aclpos < 0)
 243                                                 errno = ERANGE;
 244                                         if (errno || *ep)
 245                                                 errx(1, "Invalid ACL entry number: %ld", aclpos);
 246                                         if (acloptflags & ACL_DELETE_FLAG)
 247                                                 ace_arg_not_required = 1;
 248
 249                                         goto apdone;
 250                                 case 'i':
 251                                         acloptflags |= ACL_INHERIT_FLAG;
 252                                         /* The +aii.. syntax to specify
 253                                          * inheritance level is rather unwieldy,
 254                                          * find an alternative.
 255                                          */
 256                                         inheritance_level++;
 257                                         if (inheritance_level > 1)
 258                                                 warnx("Inheritance across more than one generation is not currently supported");
 259                                         if (inheritance_level >= MAX_INHERITANCE_LEVEL)
 260                                                 goto apdone;
 261                                         break;
 262                                 default:
 263                                         errno = EINVAL;
 264                                         usage();
 265                                 }
 266                         }
 267                 }
 268 apdone:
 269                 argv++;
 270                 argc--;
 271         }
 272 apnoacl:
 273 #endif /*__APPLE__*/
 274
 275         if (Rflag) {
 276                 fts_options = FTS_PHYSICAL;
 277                 if (hflag)
 278                         errx(1,
 279                 "the -R and -h options may not be specified together.");
 280                 if (Hflag)
 281                         fts_options |= FTS_COMFOLLOW;
 282                 if (Lflag) {
 283                         fts_options &= ~FTS_PHYSICAL;
 284                         fts_options |= FTS_LOGICAL;
 285                 }
 286         } else
 287                 fts_options = hflag ? FTS_PHYSICAL : FTS_LOGICAL;
 288
 289         if (hflag)
 290                 change_mode = lchmod;
 291         else
 292                 change_mode = chmod;
 293 #ifdef __APPLE__
 294         if (acloptflags & ACL_FROM_STDIN) {
 295                 ssize_t readval = 0;
 296                 size_t readtotal = 0;
 297
 298                 mode = (char *) malloc(MAX_ACL_TEXT_SIZE);
 299
 300                 if (mode == NULL)
 301                         err(1, "Unable to allocate mode string");
 302                 /* Read the ACEs from STDIN */
 303                 do {
 304                         readtotal += readval;
 305                         readval = read(STDIN_FILENO, mode + readtotal,
 306                                        MAX_ACL_TEXT_SIZE);
 307                 } while ((readval > 0) && (readtotal <= MAX_ACL_TEXT_SIZE));
 308
 309                 if (0 == readtotal)
 310                         errx(1, "-E specified, but read from STDIN failed");
 311                 else
 312                         mode[readtotal - 1] = '\0';
 313                 --argv;
 314         }
 315         else
 316 #endif /* __APPLE */
 317                 mode = *argv;
 318
 319 #ifdef __APPLE__
 320         if ((acloptflags & ACL_FLAG)) {
 321
 322                 /* Are we deleting by entry number, verifying
 323                  * canonicity or performing some other operation that
 324                  * does not require an input entry? If so, there's no
 325                  * entry to convert.
 326                  */
 327                 if (ace_arg_not_required) {
 328                         --argv;
 329                 }
 330                 else {
 331                         /* Parse the text into an ACL*/
 332                         acl_input = parse_acl_entries(mode);
 333                         if (acl_input == NULL) {
 334                                 errx(1, "Invalid ACL specification: %s", mode);
 335                         }
 336                 }
 337         }
 338         else {
 339 #endif /* __APPLE__*/
 340                 if (*mode >= '0' && *mode <= '7') {
 341                         errno = 0;
 342                         val = strtol(mode, &ep, 8);
 343                         if (val > USHRT_MAX || val < 0)
 344                                 errno = ERANGE;
 345                         if (errno)
 346                                 err(1, "Invalid file mode: %s", mode);
 347                         if (*ep)
 348                                 errx(1, "Invalid file mode: %s", mode);
 349                         omode = (mode_t)val;
 350                         oct = 1;
 351                 } else {
 352                         if ((set = setmode(mode)) == NULL)
 353                                 errx(1, "Invalid file mode: %s", mode);
 354                         oct = 0;
 355                 }
 356 #ifdef __APPLE__
 357         }
 358 #endif /* __APPLE__*/
 359         if ((ftsp = fts_open(++argv, fts_options, 0)) == NULL)
 360                 err(1, "fts_open");
 361         for (rval = 0; (p = fts_read(ftsp)) != NULL;) {
 362                 switch (p->fts_info) {
 363                 case FTS_D:
 364                         if (!Rflag)
 365                                 (void)fts_set(ftsp, p, FTS_SKIP);
 366                         break;
 367                 case FTS_DNR:                   /* Warn, chmod, continue. */
 368                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 369                         rval = 1;
 370                         break;
 371                 case FTS_DP:                    /* Already changed at FTS_D. */
 372                         continue;
 373                 case FTS_NS:
 374                         if (acloptflags & ACL_FLAG) /* don't need stat for -N */
 375                                 break;
 376                 case FTS_ERR:                   /* Warn, continue. */
 377                         warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 378                         rval = 1;
 379                         continue;
 380                 case FTS_SL:                    /* Ignore. */
 381                 case FTS_SLNONE:
 382                         /*
 383                          * The only symlinks that end up here are ones that
 384                          * don't point to anything and ones that we found
 385                          * doing a physical walk.
 386                          */
 387                         if (!hflag)
 388                                 continue;
 389                         /* else */
 390                         /* FALLTHROUGH */
 391                 default:
 392                         break;
 393                 }
 394 #ifdef __APPLE__
 395 /* If an ACL manipulation option was specified, manipulate */
 396                 if (acloptflags & ACL_FLAG)     {
 397                         if (0 != modify_file_acl(acloptflags, p->fts_accpath, acl_input, (int)aclpos, inheritance_level, !hflag))
 398                                 rval = 1;
 399                 }
 400                 else {
 401 #endif /* __APPLE__ */
 402                         newmode = oct ? omode : getmode(set, p->fts_statp->st_mode);
 403                         if ((newmode & ALLPERMS) == (p->fts_statp->st_mode & ALLPERMS))
 404                                 continue;
 405                         if ((*change_mode)(p->fts_accpath, newmode) && !fflag) {
 406                                 warn("Unable to change file mode on %s", p->fts_path);
 407                                 rval = 1;
 408                         } else {
 409                                 if (vflag) {
 410                                         (void)printf("%s", p->fts_accpath);
 411
 412                                         if (vflag > 1) {
 413                                                 char m1[12], m2[12];
 414
 415                                                 strmode(p->fts_statp->st_mode, m1);
 416                                                 strmode((p->fts_statp->st_mode &
 417                                                          S_IFMT) | newmode, m2);
 418
 419                                                 (void)printf(": 0%o [%s] -> 0%o [%s]",
 420                                                              p->fts_statp->st_mode, m1,
 421                                             (p->fts_statp->st_mode & S_IFMT) |
 422                                                              newmode, m2);
 423                                         }
 424                                         (void)printf("\n");
 425                                 }
 426
 427                         }
 428 #ifdef __APPLE__
 429                 }
 430 #endif /* __APPLE__*/
 431         }
 432         if (errno)
 433                 err(1, "fts_read");
 434 #ifdef __APPLE__
 435         if (acl_input)
 436                 acl_free(acl_input);
 437         if (mode && (acloptflags & ACL_FROM_STDIN))
 438                 free(mode);
 439
 440 #endif /* __APPLE__ */
 441         if (set)
 442                 free(set);
 443         exit(rval);
 444 }
 445
 446 void
 447 usage(void)
 448 {
 449 #ifdef __APPLE__
 450         (void)fprintf(stderr,
 451                       "usage:\tchmod [-fhv] [-R [-H | -L | -P]] [-a | +a | =a  [i][# [ n]]] mode|entry file ...\n"
 452                       "\tchmod [-fhv] [-R [-H | -L | -P]] [-E | -C | -N | -i | -I] file ...\n"); /* add -A and -V when implemented */
 453 #else
 454         (void)fprintf(stderr,
 455             "usage: chmod [-fhv] [-R [-H | -L | -P]] mode file ...\n");
 456 #endif /* __APPLE__ */
 457         exit(1);
 458 }