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