usr.sbin/mtree/compare.c

   1 /*      $NetBSD: compare.c,v 1.58 2013/11/21 18:39:50 christos Exp $    */
   2
   3 /*-
   4  * Copyright (c) 1989, 1993
   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 #if HAVE_NBTOOL_CONFIG_H
  33 #include "nbtool_config.h"
  34 #endif
  35
  36 #include <sys/cdefs.h>
  37 #if defined(__RCSID) && !defined(lint)
  38 #if 0
  39 static char sccsid[] = "@(#)compare.c   8.1 (Berkeley) 6/6/93";
  40 #else
  41 __RCSID("$NetBSD: compare.c,v 1.58 2013/11/21 18:39:50 christos Exp $");
  42 #endif
  43 #endif /* not lint */
  44
  45 #include <sys/param.h>
  46 #include <sys/stat.h>
  47
  48 #include <errno.h>
  49 #include <fcntl.h>
  50 #include <stdio.h>
  51 #include <stdint.h>
  52 #include <stdlib.h>
  53 #include <string.h>
  54 #include <time.h>
  55 #include <unistd.h>
  56
  57 #ifndef NO_MD5
  58 #include <md5.h>
  59 #endif
  60 #ifndef NO_RMD160
  61 #include <rmd160.h>
  62 #endif
  63 #ifndef NO_SHA1
  64 #include <sha1.h>
  65 #endif
  66 #ifndef NO_SHA2
  67 #include <sha2.h>
  68 #endif
  69
  70 #include "extern.h"
  71
  72 #define INDENTNAMELEN   8
  73 #define MARK                                                            \
  74 do {                                                                    \
  75         if (flavor == F_FREEBSD9) {                                     \
  76                 len = printf("%s changed\n", RP(p));                    \
  77                 tab = "\t";                                             \
  78         } else {                                                        \
  79                 len = printf("%s: ", RP(p));                            \
  80                 if (len > INDENTNAMELEN) {                              \
  81                         tab = "\t";                                     \
  82                         printf("\n");                                   \
  83                 } else {                                                \
  84                         tab = "";                                       \
  85                         printf("%*s", INDENTNAMELEN - (int)len, "");    \
  86                 }                                                       \
  87         }                                                               \
  88 } while (0)
  89 #define LABEL if (!label++) MARK
  90
  91 #if HAVE_STRUCT_STAT_ST_FLAGS
  92
  93
  94 #define CHANGEFLAGS                                                     \
  95         if (flags != p->fts_statp->st_flags) {                          \
  96                 char *sf;                                               \
  97                 if (!label) {                                           \
  98                         MARK;                                           \
  99                         sf = flags_to_string(p->fts_statp->st_flags, "none"); \
 100                         printf("%sflags (\"%s\"", tab, sf);             \
 101                         free(sf);                                       \
 102                 }                                                       \
 103                 if (lchflags(p->fts_accpath, flags)) {                  \
 104                         label++;                                        \
 105                         printf(", not modified: %s)\n",                 \
 106                             strerror(errno));                           \
 107                 } else {                                                \
 108                         sf = flags_to_string(flags, "none");            \
 109                         printf(", modified to \"%s\")\n", sf);          \
 110                         free(sf);                                       \
 111                 }                                                       \
 112         }
 113
 114 /* SETFLAGS:
 115  * given pflags, additionally set those flags specified in s->st_flags and
 116  * selected by mask (the other flags are left unchanged).
 117  */
 118 #define SETFLAGS(pflags, mask)                                          \
 119 do {                                                                    \
 120         flags = (s->st_flags & (mask)) | (pflags);                      \
 121         CHANGEFLAGS;                                                    \
 122 } while (0)
 123
 124 /* CLEARFLAGS:
 125  * given pflags, reset the flags specified in s->st_flags and selected by mask
 126  * (the other flags are left unchanged).
 127  */
 128 #define CLEARFLAGS(pflags, mask)                                        \
 129 do {                                                                    \
 130         flags = (~(s->st_flags & (mask)) & CH_MASK) & (pflags);         \
 131         CHANGEFLAGS;                                                    \
 132 } while (0)
 133 #endif  /* HAVE_STRUCT_STAT_ST_FLAGS */
 134
 135 int
 136 compare(NODE *s, FTSENT *p)
 137 {
 138         u_int32_t len, val;
 139 #if HAVE_STRUCT_STAT_ST_FLAGS
 140         u_int32_t flags;
 141 #endif
 142         int fd, label;
 143         const char *cp, *tab;
 144 #if !defined(NO_MD5) || !defined(NO_RMD160) || !defined(NO_SHA1) || !defined(NO_SHA2)
 145         char *digestbuf;
 146 #endif
 147
 148         tab = NULL;
 149         label = 0;
 150         switch(s->type) {
 151         case F_BLOCK:
 152                 if (!S_ISBLK(p->fts_statp->st_mode))
 153                         goto typeerr;
 154                 break;
 155         case F_CHAR:
 156                 if (!S_ISCHR(p->fts_statp->st_mode))
 157                         goto typeerr;
 158                 break;
 159         case F_DIR:
 160                 if (!S_ISDIR(p->fts_statp->st_mode))
 161                         goto typeerr;
 162                 break;
 163         case F_FIFO:
 164                 if (!S_ISFIFO(p->fts_statp->st_mode))
 165                         goto typeerr;
 166                 break;
 167         case F_FILE:
 168                 if (!S_ISREG(p->fts_statp->st_mode))
 169                         goto typeerr;
 170                 break;
 171         case F_LINK:
 172                 if (!S_ISLNK(p->fts_statp->st_mode))
 173                         goto typeerr;
 174                 break;
 175 #ifdef S_ISSOCK
 176         case F_SOCK:
 177                 if (!S_ISSOCK(p->fts_statp->st_mode))
 178                         goto typeerr;
 179                 break;
 180 #endif
 181 typeerr:                LABEL;
 182                 printf(flavor == F_FREEBSD9 ?
 183                     "\ttype expected %s found %s\n" : "\ttype (%s, %s)\n",
 184                     nodetype(s->type), inotype(p->fts_statp->st_mode));
 185                 return (label);
 186         }
 187         if (mtree_Wflag)
 188                 goto afterpermwhack;
 189 #if HAVE_STRUCT_STAT_ST_FLAGS
 190         if (iflag && !uflag) {
 191                 if (s->flags & F_FLAGS)
 192                     SETFLAGS(p->fts_statp->st_flags, SP_FLGS);
 193                 return (label);
 194         }
 195         if (mflag && !uflag) {
 196                 if (s->flags & F_FLAGS)
 197                     CLEARFLAGS(p->fts_statp->st_flags, SP_FLGS);
 198                 return (label);
 199         }
 200 #endif
 201         if (s->flags & F_DEV &&
 202             (s->type == F_BLOCK || s->type == F_CHAR) &&
 203             s->st_rdev != p->fts_statp->st_rdev) {
 204                 LABEL;
 205                 printf(flavor == F_FREEBSD9 ?
 206                     "%sdevice expected %#jx found %#jx" :
 207                     "%sdevice (%#jx, %#jx",
 208                     tab, (uintmax_t)s->st_rdev,
 209                     (uintmax_t)p->fts_statp->st_rdev);
 210                 if (uflag) {
 211                         if ((unlink(p->fts_accpath) == -1) ||
 212                             (mknod(p->fts_accpath,
 213                               s->st_mode | nodetoino(s->type),
 214                               s->st_rdev) == -1) ||
 215                             (lchown(p->fts_accpath, p->fts_statp->st_uid,
 216                               p->fts_statp->st_gid) == -1) )
 217                                 printf(", not modified: %s%s\n",
 218                                     strerror(errno),
 219                                     flavor == F_FREEBSD9 ? "" : ")");
 220                          else
 221                                 printf(", modified%s\n",
 222                                     flavor == F_FREEBSD9 ? "" : ")");
 223                 } else
 224                         printf(")\n");
 225                 tab = "\t";
 226         }
 227         /* Set the uid/gid first, then set the mode. */
 228         if (s->flags & (F_UID | F_UNAME) && s->st_uid != p->fts_statp->st_uid) {
 229                 LABEL;
 230                 printf(flavor == F_FREEBSD9 ?
 231                     "%suser expected %lu found %lu" : "%suser (%lu, %lu",
 232                     tab, (u_long)s->st_uid, (u_long)p->fts_statp->st_uid);
 233                 if (uflag) {
 234                         if (lchown(p->fts_accpath, s->st_uid, -1))
 235                                 printf(", not modified: %s%s\n",
 236                                     strerror(errno),
 237                                     flavor == F_FREEBSD9 ? "" : ")");
 238                         else
 239                                 printf(", modified%s\n",
 240                                     flavor == F_FREEBSD9 ? "" : ")");
 241                 } else
 242                         printf(")\n");
 243                 tab = "\t";
 244         }
 245         if (s->flags & (F_GID | F_GNAME) && s->st_gid != p->fts_statp->st_gid) {
 246                 LABEL;
 247                 printf(flavor == F_FREEBSD9 ?
 248                     "%sgid expected %lu found %lu" : "%sgid (%lu, %lu",
 249                     tab, (u_long)s->st_gid, (u_long)p->fts_statp->st_gid);
 250                 if (uflag) {
 251                         if (lchown(p->fts_accpath, -1, s->st_gid))
 252                                 printf(", not modified: %s%s\n",
 253                                     strerror(errno),
 254                                     flavor == F_FREEBSD9 ? "" : ")");
 255                         else
 256                                 printf(", modified%s\n",
 257                                     flavor == F_FREEBSD9 ? "" : ")");
 258                 }
 259                 else
 260                         printf(")\n");
 261                 tab = "\t";
 262         }
 263         if (s->flags & F_MODE &&
 264             s->st_mode != (p->fts_statp->st_mode & MBITS)) {
 265                 if (lflag) {
 266                         mode_t tmode, mode;
 267
 268                         tmode = s->st_mode;
 269                         mode = p->fts_statp->st_mode & MBITS;
 270                         /*
 271                          * if none of the suid/sgid/etc bits are set,
 272                          * then if the mode is a subset of the target,
 273                          * skip.
 274                          */
 275                         if (!((tmode & ~(S_IRWXU|S_IRWXG|S_IRWXO)) ||
 276                             (mode & ~(S_IRWXU|S_IRWXG|S_IRWXO))))
 277                                 if ((mode | tmode) == tmode)
 278                                         goto skip;
 279                 }
 280
 281                 LABEL;
 282                 printf(flavor == F_FREEBSD9 ?
 283                     "%spermissions expcted %#lo found %#lo" :
 284                     "%spermissions (%#lo, %#lo",
 285                     tab, (u_long)s->st_mode,
 286                     (u_long)p->fts_statp->st_mode & MBITS);
 287                 if (uflag) {
 288                         if (lchmod(p->fts_accpath, s->st_mode))
 289                                 printf(", not modified: %s%s\n",
 290                                     strerror(errno),
 291                                     flavor == F_FREEBSD9 ? "" : ")");
 292                         else
 293                                 printf(", modified%s\n",
 294                                     flavor == F_FREEBSD9 ? "" : ")");
 295                 }
 296                 else
 297                         printf(")\n");
 298                 tab = "\t";
 299         skip:   ;
 300         }
 301         if (s->flags & F_NLINK && s->type != F_DIR &&
 302             s->st_nlink != p->fts_statp->st_nlink) {
 303                 LABEL;
 304                 printf(flavor == F_FREEBSD9 ?
 305                     "%slink count expected %lu found %lu\n" :
 306                     "%slink count (%lu, %lu)\n",
 307                     tab, (u_long)s->st_nlink, (u_long)p->fts_statp->st_nlink);
 308                 tab = "\t";
 309         }
 310         if (s->flags & F_SIZE && s->st_size != p->fts_statp->st_size) {
 311                 LABEL;
 312                 printf(flavor == F_FREEBSD9 ?
 313                     "%ssize expected %ju found %ju\n" : "%ssize (%ju, %ju)\n",
 314                     tab, (uintmax_t)s->st_size,
 315                     (uintmax_t)p->fts_statp->st_size);
 316                 tab = "\t";
 317         }
 318         /*
 319          * XXX
 320          * Since utimes(2) only takes a timeval, there's no point in
 321          * comparing the low bits of the timespec nanosecond field.  This
 322          * will only result in mismatches that we can never fix.
 323          *
 324          * Doesn't display microsecond differences.
 325          */
 326         if (s->flags & F_TIME) {
 327                 struct timeval tv[2];
 328                 struct stat *ps = p->fts_statp;
 329                 time_t smtime = s->st_mtimespec.tv_sec;
 330
 331 #if defined(BSD4_4) && !defined(HAVE_NBTOOL_CONFIG_H)
 332                 time_t pmtime = ps->st_mtimespec.tv_sec;
 333
 334                 TIMESPEC_TO_TIMEVAL(&tv[0], &s->st_mtimespec);
 335                 TIMESPEC_TO_TIMEVAL(&tv[1], &ps->st_mtimespec);
 336 #else
 337                 time_t pmtime = (time_t)ps->st_mtime;
 338
 339                 tv[0].tv_sec = smtime;
 340                 tv[0].tv_usec = 0;
 341                 tv[1].tv_sec = pmtime;
 342                 tv[1].tv_usec = 0;
 343 #endif
 344
 345                 if (tv[0].tv_sec != tv[1].tv_sec ||
 346                     tv[0].tv_usec != tv[1].tv_usec) {
 347                         LABEL;
 348                         printf(flavor == F_FREEBSD9 ?
 349                             "%smodification time expected %.24s found " :
 350                             "%smodification time (%.24s, ",
 351                             tab, ctime(&smtime));
 352                         printf("%.24s", ctime(&pmtime));
 353                         if (tflag) {
 354                                 tv[1] = tv[0];
 355                                 if (utimes(p->fts_accpath, tv))
 356                                         printf(", not modified: %s%s\n",
 357                                             strerror(errno),
 358                                             flavor == F_FREEBSD9 ? "" : ")");
 359                                 else
 360                                         printf(", modified%s\n",
 361                                             flavor == F_FREEBSD9 ? "" : ")");
 362                         } else
 363                                 printf("%s\n", flavor == F_FREEBSD9 ? "" : ")");
 364                         tab = "\t";
 365                 }
 366         }
 367 #if HAVE_STRUCT_STAT_ST_FLAGS
 368         /*
 369          * XXX
 370          * since lchflags(2) will reset file times, the utimes() above
 371          * may have been useless!  oh well, we'd rather have correct
 372          * flags, rather than times?
 373          */
 374         if ((s->flags & F_FLAGS) && ((s->st_flags != p->fts_statp->st_flags)
 375             || mflag || iflag)) {
 376                 if (s->st_flags != p->fts_statp->st_flags) {
 377                         char *f_s;
 378                         LABEL;
 379                         f_s = flags_to_string(s->st_flags, "none");
 380                         printf(flavor == F_FREEBSD9 ?
 381                             "%sflags expected \"%s\" found " :
 382                             "%sflags (\"%s\" is not ", tab, f_s);
 383                         free(f_s);
 384                         f_s = flags_to_string(p->fts_statp->st_flags, "none");
 385                         printf("\"%s\"", f_s);
 386                         free(f_s);
 387                 }
 388                 if (uflag) {
 389                         if (iflag)
 390                                 SETFLAGS(0, CH_MASK);
 391                         else if (mflag)
 392                                 CLEARFLAGS(0, SP_FLGS);
 393                         else
 394                                 SETFLAGS(0, (~SP_FLGS & CH_MASK));
 395                 } else
 396                         printf("%s\n", flavor == F_FREEBSD9 ? "" : ")");
 397                 tab = "\t";
 398         }
 399 #endif  /* HAVE_STRUCT_STAT_ST_FLAGS */
 400
 401         /*
 402          * from this point, no more permission checking or whacking
 403          * occurs, only checking of stuff like checksums and symlinks.
 404          */
 405  afterpermwhack:
 406         if (s->flags & F_CKSUM) {
 407                 if ((fd = open(p->fts_accpath, O_RDONLY, 0)) < 0) {
 408                         LABEL;
 409                         printf("%scksum: %s: %s\n",
 410                             tab, p->fts_accpath, strerror(errno));
 411                         tab = "\t";
 412                 } else if (crc(fd, &val, &len)) {
 413                         close(fd);
 414                         LABEL;
 415                         printf("%scksum: %s: %s\n",
 416                             tab, p->fts_accpath, strerror(errno));
 417                         tab = "\t";
 418                 } else {
 419                         close(fd);
 420                         if (s->cksum != val) {
 421                                 LABEL;
 422                                 printf(flavor == F_FREEBSD9 ?
 423                                     "%scksum expected %lu found %lu\n" :
 424                                     "%scksum (%lu, %lu)\n",
 425                                     tab, s->cksum, (unsigned long)val);
 426                         }
 427                         tab = "\t";
 428                 }
 429         }
 430 #ifndef NO_MD5
 431         if (s->flags & F_MD5) {
 432                 if ((digestbuf = MD5File(p->fts_accpath, NULL)) == NULL) {
 433                         LABEL;
 434                         printf("%s%s: %s: %s\n",
 435                             tab, MD5KEY, p->fts_accpath, strerror(errno));
 436                         tab = "\t";
 437                 } else {
 438                         if (strcmp(s->md5digest, digestbuf)) {
 439                                 LABEL;
 440                                 printf(flavor == F_FREEBSD9 ?
 441                                     "%s%s expected %s found %s\n" :
 442                                     "%s%s (0x%s, 0x%s)\n",
 443                                     tab, MD5KEY, s->md5digest, digestbuf);
 444                         }
 445                         tab = "\t";
 446                         free(digestbuf);
 447                 }
 448         }
 449 #endif  /* ! NO_MD5 */
 450 #ifndef NO_RMD160
 451         if (s->flags & F_RMD160) {
 452                 if ((digestbuf = RMD160File(p->fts_accpath, NULL)) == NULL) {
 453                         LABEL;
 454                         printf("%s%s: %s: %s\n",
 455                             tab, RMD160KEY, p->fts_accpath, strerror(errno));
 456                         tab = "\t";
 457                 } else {
 458                         if (strcmp(s->rmd160digest, digestbuf)) {
 459                                 LABEL;
 460                                 printf(flavor == F_FREEBSD9 ?
 461                                     "%s%s expected %s found %s\n" :
 462                                     "%s%s (0x%s, 0x%s)\n",
 463                                     tab, RMD160KEY, s->rmd160digest, digestbuf);
 464                         }
 465                         tab = "\t";
 466                         free(digestbuf);
 467                 }
 468         }
 469 #endif  /* ! NO_RMD160 */
 470 #ifndef NO_SHA1
 471         if (s->flags & F_SHA1) {
 472                 if ((digestbuf = SHA1File(p->fts_accpath, NULL)) == NULL) {
 473                         LABEL;
 474                         printf("%s%s: %s: %s\n",
 475                             tab, SHA1KEY, p->fts_accpath, strerror(errno));
 476                         tab = "\t";
 477                 } else {
 478                         if (strcmp(s->sha1digest, digestbuf)) {
 479                                 LABEL;
 480                                 printf(flavor == F_FREEBSD9 ?
 481                                     "%s%s expected %s found %s\n" :
 482                                     "%s%s (0x%s, 0x%s)\n",
 483                                     tab, SHA1KEY, s->sha1digest, digestbuf);
 484                         }
 485                         tab = "\t";
 486                         free(digestbuf);
 487                 }
 488         }
 489 #endif  /* ! NO_SHA1 */
 490 #ifndef NO_SHA2
 491         if (s->flags & F_SHA256) {
 492                 if ((digestbuf = SHA256_File(p->fts_accpath, NULL)) == NULL) {
 493                         LABEL;
 494                         printf("%s%s: %s: %s\n",
 495                             tab, SHA256KEY, p->fts_accpath, strerror(errno));
 496                         tab = "\t";
 497                 } else {
 498                         if (strcmp(s->sha256digest, digestbuf)) {
 499                                 LABEL;
 500                                 printf(flavor == F_FREEBSD9 ?
 501                                     "%s%s expected %s found %s\n" :
 502                                     "%s%s (0x%s, 0x%s)\n",
 503                                     tab, SHA256KEY, s->sha256digest, digestbuf);
 504                         }
 505                         tab = "\t";
 506                         free(digestbuf);
 507                 }
 508         }
 509 #ifdef SHA384_BLOCK_LENGTH
 510         if (s->flags & F_SHA384) {
 511                 if ((digestbuf = SHA384_File(p->fts_accpath, NULL)) == NULL) {
 512                         LABEL;
 513                         printf("%s%s: %s: %s\n",
 514                             tab, SHA384KEY, p->fts_accpath, strerror(errno));
 515                         tab = "\t";
 516                 } else {
 517                         if (strcmp(s->sha384digest, digestbuf)) {
 518                                 LABEL;
 519                                 printf(flavor == F_FREEBSD9 ?
 520                                     "%s%s expected %s found %s\n" :
 521                                     "%s%s (0x%s, 0x%s)\n",
 522                                     tab, SHA384KEY, s->sha384digest, digestbuf);
 523                         }
 524                         tab = "\t";
 525                         free(digestbuf);
 526                 }
 527         }
 528 #endif
 529         if (s->flags & F_SHA512) {
 530                 if ((digestbuf = SHA512_File(p->fts_accpath, NULL)) == NULL) {
 531                         LABEL;
 532                         printf("%s%s: %s: %s\n",
 533                             tab, SHA512KEY, p->fts_accpath, strerror(errno));
 534                         tab = "\t";
 535                 } else {
 536                         if (strcmp(s->sha512digest, digestbuf)) {
 537                                 LABEL;
 538                                 printf(flavor == F_FREEBSD9 ?
 539                                     "%s%s expected %s found %s\n" :
 540                                     "%s%s (0x%s, 0x%s)\n",
 541                                     tab, SHA512KEY, s->sha512digest, digestbuf);
 542                         }
 543                         tab = "\t";
 544                         free(digestbuf);
 545                 }
 546         }
 547 #endif  /* ! NO_SHA2 */
 548         if (s->flags & F_SLINK &&
 549             strcmp(cp = rlink(p->fts_accpath), s->slink)) {
 550                 LABEL;
 551                 printf(flavor == F_FREEBSD9 ?
 552                     "%slink ref expected %s found %s" :
 553                     "%slink ref (%s, %s", tab, cp, s->slink);
 554                 if (uflag) {
 555                         if ((unlink(p->fts_accpath) == -1) ||
 556                             (symlink(s->slink, p->fts_accpath) == -1) )
 557                                 printf(", not modified: %s%s\n",
 558                                     strerror(errno),
 559                                     flavor == F_FREEBSD9 ? "" : ")");
 560                         else
 561                                 printf(", modified%s\n",
 562                                     flavor == F_FREEBSD9 ? "" : ")");
 563                 } else
 564                         printf("%s\n", flavor == F_FREEBSD9 ? "" : ")");
 565         }
 566         return (label);
 567 }
 568
 569 const char *
 570 rlink(const char *name)
 571 {
 572         static char lbuf[MAXPATHLEN];
 573         int len;
 574
 575         if ((len = readlink(name, lbuf, sizeof(lbuf) - 1)) == -1)
 576                 mtree_err("%s: %s", name, strerror(errno));
 577         lbuf[len] = '\0';
 578         return (lbuf);
 579 }