src/metaentry.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Various functions to work with meta entries.
   4  *
   5  * Copyright (C) 2007-2008 David Härdeman <david@hardeman.nu>
   6  * Copyright (C) 2012-2018 Przemyslaw Pawelczyk <przemoc@gmail.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License as published by the
  10  * Free Software Foundation; only version 2 of the License is applicable.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  15  * See the GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #define _GNU_SOURCE
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <sys/types.h>
  26 #include <sys/stat.h>
  27 #include <unistd.h>
  28
  29 #if !defined(NO_XATTR) || !NO_XATTR
  30 # include <sys/xattr.h>
  31 #endif /* !NO_XATTR */
  32
  33 #include <limits.h>
  34 #include <dirent.h>
  35 #include <sys/mman.h>
  36 #include <utime.h>
  37 #include <fcntl.h>
  38 #include <stdint.h>
  39 #include <errno.h>
  40 #include <time.h>
  41
  42 #include <sys/param.h>
  43 #ifndef BSD
  44 # include <bsd/string.h>
  45 #endif
  46
  47 #include "metastore.h"
  48 #include "metaentry.h"
  49 #include "utils.h"
  50
  51 #ifndef PATH_MAX
  52 # define PATH_MAX 4096
  53 #endif
  54
  55 #if !defined(NO_XATTR) || !NO_XATTR
  56 /* Free's a metaentry and all its parameters */
  57 static void
  58 mentry_free(struct metaentry *m)
  59 {
  60         unsigned i;
  61
  62         if (!m)
  63                 return;
  64
  65         free(m->path);
  66         free(m->owner);
  67         free(m->group);
  68
  69         for (i = 0; i < m->xattrs; i++) {
  70                 free(m->xattr_names[i]);
  71                 free(m->xattr_values[i]);
  72         }
  73
  74         free(m->xattr_names);
  75         free(m->xattr_values);
  76         free(m->xattr_lvalues);
  77
  78         free(m);
  79 }
  80 #endif /* !NO_XATTR */
  81
  82 /* Allocates an empty metahash table */
  83 static struct metahash *
  84 mhash_alloc(void)
  85 {
  86         struct metahash *mhash;
  87         mhash = xmalloc(sizeof(struct metahash));
  88         memset(mhash, 0, sizeof(struct metahash));
  89         return mhash;
  90 }
  91
  92 /* Generates a hash key (using djb2) */
  93 static unsigned
  94 hash(const char *str)
  95 {
  96         unsigned hash = 5381;
  97         int c;
  98
  99         while ((c = *str++))
 100                 hash = ((hash << 5) + hash) + c;
 101
 102         return hash % HASH_INDEXES;
 103 }
 104
 105 /* Allocates an empty metaentry */
 106 static struct metaentry *
 107 mentry_alloc(void)
 108 {
 109         struct metaentry *mentry;
 110         mentry = xmalloc(sizeof(struct metaentry));
 111         memset(mentry, 0, sizeof(struct metaentry));
 112         return mentry;
 113 }
 114
 115 /* Does a bisect search for the closest match in a metaentry list */
 116 static struct metaentry *
 117 mentry_find(const char *path, struct metahash *mhash)
 118 {
 119         struct metaentry *base;
 120         unsigned key;
 121
 122         if (!mhash) {
 123                 msg(MSG_ERROR, "%s called with empty hash table\n", __func__);
 124                 return NULL;
 125         }
 126
 127         key = hash(path);
 128         for (base = mhash->bucket[key]; base; base = base->next) {
 129                 if (!strcmp(base->path, path))
 130                         return base;
 131         }
 132
 133         return NULL;
 134 }
 135
 136 /* Inserts a metaentry into a metaentry list */
 137 static void
 138 mentry_insert(struct metaentry *mentry, struct metahash *mhash)
 139 {
 140         unsigned key;
 141
 142         key = hash(mentry->path);
 143         mentry->next = mhash->bucket[key];
 144         mhash->bucket[key] = mentry;
 145 }
 146
 147 #ifdef DEBUG
 148 /* Prints a metaentry */
 149 static void
 150 mentry_print(const struct metaentry *mentry)
 151 {
 152         int i;
 153
 154         if (!mentry || !mentry->path) {
 155                 msg(MSG_DEBUG,
 156                     "Incorrect meta entry passed to printmetaentry\n");
 157                 return;
 158         }
 159
 160         msg(MSG_DEBUG, "===========================\n");
 161         msg(MSG_DEBUG, "Dump of metaentry %p\n", mentry);
 162         msg(MSG_DEBUG, "===========================\n");
 163
 164         msg(MSG_DEBUG, "path\t\t: %s\n", mentry->path);
 165         msg(MSG_DEBUG, "owner\t\t: %s\n", mentry->owner);
 166         msg(MSG_DEBUG, "group\t\t: %s\n", mentry->group);
 167         msg(MSG_DEBUG, "mtime\t\t: %ld\n", (unsigned long)mentry->mtime);
 168         msg(MSG_DEBUG, "mtimensec\t: %ld\n", (unsigned long)mentry->mtimensec);
 169         msg(MSG_DEBUG, "mode\t\t: %ld\n", (unsigned long)mentry->mode);
 170         for (i = 0; i < mentry->xattrs; i++) {
 171                 msg(MSG_DEBUG, "xattr[%i]\t: %s=\"", i, mentry->xattr_names[i]);
 172                 binary_print(mentry->xattr_values[i], mentry->xattr_lvalues[i]);
 173                 msg(MSG_DEBUG, "\"\n");
 174         }
 175
 176         msg(MSG_DEBUG, "===========================\n\n");
 177 }
 178
 179 /* Prints all metaentries in a metaentry list */
 180 static void
 181 mentries_print(const struct metahash *mhash)
 182 {
 183         const struct metaentry *mentry;
 184         int index;
 185
 186         for (index = 0; index < HASH_INDEXES; index++)
 187                 for (mentry = mhash->bucket[index]; mentry; mentry = mentry->next)
 188                         mentry_print(mentry);
 189
 190         msg(MSG_DEBUG, "%i entries in total\n", mhash->count);
 191 }
 192 #endif
 193
 194 /* Creates a metaentry for the file/dir/etc at path */
 195 struct metaentry *
 196 mentry_create(const char *path)
 197 {
 198 #if !defined(NO_XATTR) || !NO_XATTR
 199         ssize_t lsize, vsize;
 200         char *list, *attr;
 201 #endif /* !NO_XATTR */
 202         struct stat sbuf;
 203         struct passwd *pbuf;
 204         struct group *gbuf;
 205 #if !defined(NO_XATTR) || !NO_XATTR
 206         int i;
 207 #endif /* !NO_XATTR */
 208         struct metaentry *mentry;
 209
 210         if (lstat(path, &sbuf)) {
 211                 msg(MSG_ERROR, "lstat failed for %s: %s\n",
 212                     path, strerror(errno));
 213                 return NULL;
 214         }
 215
 216         pbuf = xgetpwuid(sbuf.st_uid);
 217         if (!pbuf) {
 218                 msg(MSG_ERROR, "getpwuid failed for %s: uid %i not found\n",
 219                     path, (int)sbuf.st_uid);
 220                 return NULL;
 221         }
 222
 223         gbuf = xgetgrgid(sbuf.st_gid);
 224         if (!gbuf) {
 225                 msg(MSG_ERROR, "getgrgid failed for %s: gid %i not found\n",
 226                     path, (int)sbuf.st_gid);
 227                 return NULL;
 228         }
 229
 230         mentry = mentry_alloc();
 231         mentry->path = xstrdup(path);
 232         mentry->pathlen = strlen(mentry->path);
 233         mentry->owner = xstrdup(pbuf->pw_name);
 234         mentry->group = xstrdup(gbuf->gr_name);
 235         mentry->mode = sbuf.st_mode & 0177777;
 236         mentry->mtime = sbuf.st_mtim.tv_sec;
 237         mentry->mtimensec = sbuf.st_mtim.tv_nsec;
 238
 239         /* symlinks have no xattrs */
 240         if (S_ISLNK(mentry->mode))
 241                 return mentry;
 242
 243 #if !defined(NO_XATTR) || !NO_XATTR
 244         lsize = listxattr(path, NULL, 0);
 245         if (lsize < 0) {
 246                 /* Perhaps the FS doesn't support xattrs? */
 247                 if (errno == ENOTSUP)
 248                         return mentry;
 249
 250                 msg(MSG_ERROR, "listxattr failed for %s: %s\n",
 251                     path, strerror(errno));
 252                 return NULL;
 253         }
 254
 255         list = xmalloc(lsize);
 256         lsize = listxattr(path, list, lsize);
 257         if (lsize < 0) {
 258                 msg(MSG_ERROR, "listxattr failed for %s: %s\n",
 259                     path, strerror(errno));
 260                 free(list);
 261                 return NULL;
 262         }
 263
 264         i = 0;
 265         for (attr = list; attr < list + lsize; attr = strchr(attr, '\0') + 1) {
 266                 if (*attr == '\0')
 267                         continue;
 268                 i++;
 269         }
 270
 271         if (i == 0)
 272                 return mentry;
 273
 274         mentry->xattrs = i;
 275         mentry->xattr_names = xmalloc(i * sizeof(char *));
 276         mentry->xattr_values = xmalloc(i * sizeof(char *));
 277         mentry->xattr_lvalues = xmalloc(i * sizeof(ssize_t));
 278
 279         i = 0;
 280         for (attr = list; attr < list + lsize; attr = strchr(attr, '\0') + 1) {
 281                 if (*attr == '\0')
 282                         continue;
 283
 284                 mentry->xattr_names[i] = xstrdup(attr);
 285                 mentry->xattr_values[i] = NULL;
 286
 287                 vsize = getxattr(path, attr, NULL, 0);
 288                 if (vsize < 0) {
 289                         msg(MSG_ERROR, "getxattr failed for %s: %s\n",
 290                             path, strerror(errno));
 291                         free(list);
 292                         mentry->xattrs = i + 1;
 293                         mentry_free(mentry);
 294                         return NULL;
 295                 }
 296
 297                 mentry->xattr_lvalues[i] = vsize;
 298                 mentry->xattr_values[i] = xmalloc(vsize);
 299
 300                 vsize = getxattr(path, attr, mentry->xattr_values[i], vsize);
 301                 if (vsize < 0) {
 302                         msg(MSG_ERROR, "getxattr failed for %s: %s\n",
 303                             path, strerror(errno));
 304                         free(list);
 305                         mentry->xattrs = i + 1;
 306                         mentry_free(mentry);
 307                         return NULL;
 308                 }
 309                 i++;
 310         }
 311
 312         free(list);
 313 #endif /* !NO_XATTR */
 314
 315         return mentry;
 316 }
 317
 318 /* Cleans up a path and makes it relative to cwd unless it is absolute */
 319 static char *
 320 normalize_path(const char *orig)
 321 {
 322         char *real = realpath(orig, NULL);
 323         char cwd[PATH_MAX];
 324         char *result;
 325
 326         getcwd(cwd, PATH_MAX);
 327         if (!real)
 328                 return NULL;
 329
 330         if (!strncmp(real, cwd, strlen(cwd))) {
 331                 result = xmalloc(strlen(real) - strlen(cwd) + 1 + 1);
 332                 result[0] = '\0';
 333                 strcat(result, ".");
 334                 strcat(result, real + strlen(cwd));
 335         } else {
 336                 result = xstrdup(real);
 337         }
 338
 339         free(real);
 340         return result;
 341 }
 342
 343 /* Internal function for the recursive path walk */
 344 static void
 345 mentries_recurse(const char *path, struct metahash *mhash, msettings *st)
 346 {
 347         struct stat sbuf;
 348         struct metaentry *mentry;
 349         char tpath[PATH_MAX];
 350         DIR *dir;
 351         struct dirent *dent;
 352
 353         if (!path)
 354                 return;
 355
 356         if (lstat(path, &sbuf)) {
 357                 msg(MSG_ERROR, "lstat failed for %s: %s\n",
 358                     path, strerror(errno));
 359                 return;
 360         }
 361
 362         mentry = mentry_create(path);
 363         if (!mentry)
 364                 return;
 365
 366         mentry_insert(mentry, mhash);
 367
 368         if (S_ISDIR(sbuf.st_mode)) {
 369                 dir = opendir(path);
 370                 if (!dir) {
 371                         msg(MSG_ERROR, "opendir failed for %s: %s\n",
 372                             path, strerror(errno));
 373                         return;
 374                 }
 375
 376                 while ((dent = readdir(dir))) {
 377                         if (!strcmp(dent->d_name, ".") ||
 378                             !strcmp(dent->d_name, "..") ||
 379                             (!st->do_git && !strcmp(dent->d_name, ".git"))
 380                            )
 381                                 continue;
 382                         snprintf(tpath, PATH_MAX, "%s/%s", path, dent->d_name);
 383                         tpath[PATH_MAX - 1] = '\0';
 384                         mentries_recurse(tpath, mhash, st);
 385                 }
 386
 387                 closedir(dir);
 388         }
 389 }
 390
 391 /* Recurses opath and adds metadata entries to the metaentry list */
 392 void
 393 mentries_recurse_path(const char *opath, struct metahash **mhash, msettings *st)
 394 {
 395         char *path = normalize_path(opath);
 396
 397         if (!(*mhash))
 398                 *mhash = mhash_alloc();
 399         mentries_recurse(path, *mhash, st);
 400         free(path);
 401 }
 402
 403 /* Stores metaentries to a file */
 404 void
 405 mentries_tofile(const struct metahash *mhash, const char *path)
 406 {
 407         FILE *to;
 408         const struct metaentry *mentry;
 409         int key;
 410         unsigned i;
 411
 412         to = fopen(path, "w");
 413         if (!to) {
 414                 msg(MSG_CRITICAL, "Failed to open %s: %s\n",
 415                     path, strerror(errno));
 416                 exit(EXIT_FAILURE);
 417         }
 418
 419         write_binary_string(SIGNATURE, SIGNATURELEN, to);
 420         write_binary_string(VERSION, VERSIONLEN, to);
 421
 422         for (key = 0; key < HASH_INDEXES; key++) {
 423                 for (mentry = mhash->bucket[key]; mentry; mentry = mentry->next) {
 424                         write_string(mentry->path, to);
 425                         write_string(mentry->owner, to);
 426                         write_string(mentry->group, to);
 427                         write_int((uint64_t)mentry->mtime, 8, to);
 428                         write_int((uint64_t)mentry->mtimensec, 8, to);
 429                         write_int((uint64_t)mentry->mode, 2, to);
 430                         write_int(mentry->xattrs, 4, to);
 431                         for (i = 0; i < mentry->xattrs; i++) {
 432                                 write_string(mentry->xattr_names[i], to);
 433                                 write_int(mentry->xattr_lvalues[i], 4, to);
 434                                 write_binary_string(mentry->xattr_values[i],
 435                                                     mentry->xattr_lvalues[i], to);
 436                         }
 437                 }
 438         }
 439
 440         fclose(to);
 441 }
 442
 443 /* Creates a metaentry list from a file */
 444 void
 445 mentries_fromfile(struct metahash **mhash, const char *path)
 446 {
 447         struct metaentry *mentry;
 448         char *mmapstart;
 449         char *ptr;
 450         char *max;
 451         int fd;
 452         struct stat sbuf;
 453         unsigned i;
 454
 455         if (!(*mhash))
 456                 *mhash = mhash_alloc();
 457
 458         fd = open(path, O_RDONLY);
 459         if (fd < 0) {
 460                 msg(MSG_CRITICAL, "Failed to open %s: %s\n",
 461                     path, strerror(errno));
 462                 exit(EXIT_FAILURE);
 463         }
 464
 465         if (fstat(fd, &sbuf)) {
 466                 msg(MSG_CRITICAL, "Failed to stat %s: %s\n",
 467                     path, strerror(errno));
 468                 exit(EXIT_FAILURE);
 469         }
 470
 471         if (sbuf.st_size < (SIGNATURELEN + VERSIONLEN)) {
 472                 msg(MSG_CRITICAL, "File %s has an invalid size\n", path);
 473                 exit(EXIT_FAILURE);
 474         }
 475
 476         mmapstart = mmap(NULL, (size_t)sbuf.st_size, PROT_READ,
 477                          MAP_SHARED, fd, 0);
 478         if (mmapstart == MAP_FAILED) {
 479                 msg(MSG_CRITICAL, "Unable to mmap %s: %s\n",
 480                     path, strerror(errno));
 481                 exit(EXIT_FAILURE);
 482         }
 483         ptr = mmapstart;
 484         max = mmapstart + sbuf.st_size;
 485
 486         if (strncmp(ptr, SIGNATURE, SIGNATURELEN)) {
 487                 msg(MSG_CRITICAL, "Invalid signature for file %s\n", path);
 488                 goto out;
 489         }
 490         ptr += SIGNATURELEN;
 491
 492         if (strncmp(ptr, VERSION, VERSIONLEN)) {
 493                 msg(MSG_CRITICAL, "Invalid version of file %s\n", path);
 494                 goto out;
 495         }
 496         ptr += VERSIONLEN;
 497
 498         while (ptr < mmapstart + sbuf.st_size) {
 499                 if (*ptr == '\0') {
 500                         msg(MSG_CRITICAL, "Invalid characters in file %s\n",
 501                             path);
 502                         goto out;
 503                 }
 504
 505                 mentry = mentry_alloc();
 506                 mentry->path = read_string(&ptr, max);
 507                 mentry->pathlen = strlen(mentry->path);
 508                 mentry->owner = read_string(&ptr, max);
 509                 mentry->group = read_string(&ptr, max);
 510                 mentry->mtime = (time_t)read_int(&ptr, 8, max);
 511                 mentry->mtimensec = (time_t)read_int(&ptr, 8, max);
 512                 mentry->mode = (mode_t)read_int(&ptr, 2, max);
 513                 mentry->xattrs = (unsigned)read_int(&ptr, 4, max);
 514
 515                 if (!mentry->xattrs) {
 516                         mentry_insert(mentry, *mhash);
 517                         continue;
 518                 }
 519
 520                 mentry->xattr_names   = xmalloc(mentry->xattrs * sizeof(char *));
 521                 mentry->xattr_lvalues = xmalloc(mentry->xattrs * sizeof(ssize_t));
 522                 mentry->xattr_values  = xmalloc(mentry->xattrs * sizeof(char *));
 523
 524                 for (i = 0; i < mentry->xattrs; i++) {
 525                         mentry->xattr_names[i] = read_string(&ptr, max);
 526                         mentry->xattr_lvalues[i] = (int)read_int(&ptr, 4, max);
 527                         mentry->xattr_values[i] = read_binary_string(
 528                                                    &ptr,
 529                                                    mentry->xattr_lvalues[i],
 530                                                    max
 531                                                   );
 532                 }
 533                 mentry_insert(mentry, *mhash);
 534         }
 535
 536 out:
 537         munmap(mmapstart, sbuf.st_size);
 538         close(fd);
 539 }
 540
 541 /* Searches haystack for an xattr matching xattr number n in needle */
 542 int
 543 mentry_find_xattr(struct metaentry *haystack, struct metaentry *needle,
 544                   unsigned n)
 545 {
 546         unsigned i;
 547
 548         for (i = 0; i < haystack->xattrs; i++) {
 549                 if (strcmp(haystack->xattr_names[i], needle->xattr_names[n]))
 550                         continue;
 551                 if (haystack->xattr_lvalues[i] != needle->xattr_lvalues[n])
 552                         return -1;
 553                 if (bcmp(haystack->xattr_values[i], needle->xattr_values[n],
 554                          needle->xattr_lvalues[n])
 555                    )
 556                         return -1;
 557                 return i;
 558         }
 559         return -1;
 560 }
 561
 562 /* Returns zero if all xattrs in left and right match */
 563 static int
 564 mentry_compare_xattr(struct metaentry *left, struct metaentry *right)
 565 {
 566         unsigned i;
 567
 568         if (left->xattrs != right->xattrs)
 569                 return 1;
 570
 571         /* Make sure all xattrs in left are found in right and vice versa */
 572         for (i = 0; i < left->xattrs; i++) {
 573                 if (   mentry_find_xattr(right, left, i) < 0
 574                     || mentry_find_xattr(left, right, i) < 0
 575                    ) {
 576                         return 1;
 577                 }
 578         }
 579
 580         return 0;
 581 }
 582
 583 /* Compares two metaentries and returns an int with a bitmask of differences */
 584 int
 585 mentry_compare(struct metaentry *left, struct metaentry *right, msettings *st)
 586 {
 587         int retval = DIFF_NONE;
 588
 589         if (!left || !right) {
 590                 msg(MSG_ERROR, "%s called with empty list\n", __func__);
 591                 return -1;
 592         }
 593
 594         if (strcmp(left->path, right->path))
 595                 return -1;
 596
 597         if (strcmp(left->owner, right->owner))
 598                 retval |= DIFF_OWNER;
 599
 600         if (strcmp(left->group, right->group))
 601                 retval |= DIFF_GROUP;
 602
 603         if ((left->mode & 07777) != (right->mode & 07777))
 604                 retval |= DIFF_MODE;
 605
 606         if ((left->mode & S_IFMT) != (right->mode & S_IFMT))
 607                 retval |= DIFF_TYPE;
 608
 609         if (st->do_mtime && strcmp(left->path, st->metafile) &&
 610             (   left->mtime     != right->mtime
 611              || left->mtimensec != right->mtimensec)
 612            )
 613                 retval |= DIFF_MTIME;
 614
 615         if (mentry_compare_xattr(left, right)) {
 616                 retval |= DIFF_XATTR;
 617                 return retval;
 618         }
 619
 620         return retval;
 621 }
 622
 623 /* Compares lists of real and stored metadata and calls pfunc for each */
 624 void
 625 mentries_compare(struct metahash *mhashreal,
 626                  struct metahash *mhashstored,
 627                  void (*pfunc)
 628                  (struct metaentry *real, struct metaentry *stored, int cmp),
 629                  msettings *st)
 630 {
 631         struct metaentry *real, *stored;
 632         int key;
 633
 634         if (!mhashreal || !mhashstored) {
 635                 msg(MSG_ERROR, "%s called with empty list\n", __func__);
 636                 return;
 637         }
 638
 639         for (key = 0; key < HASH_INDEXES; key++) {
 640                 for (real = mhashreal->bucket[key]; real; real = real->next) {
 641                         stored = mentry_find(real->path, mhashstored);
 642
 643                         if (!stored)
 644                                 pfunc(real, NULL, DIFF_ADDED);
 645                         else
 646                                 pfunc(real, stored, mentry_compare(real, stored, st));
 647                 }
 648
 649                 for (stored = mhashstored->bucket[key]; stored; stored = stored->next) {
 650                         real = mentry_find(stored->path, mhashreal);
 651
 652                         if (!real)
 653                                 pfunc(NULL, stored, DIFF_DELE);
 654                 }
 655         }
 656 }
 657
 658 /* Dumps given metadata */
 659 void
 660 mentries_dump(struct metahash *mhash)
 661 {
 662         const struct metaentry *mentry;
 663         char mode[11 + 1] = "";
 664         char date[12 + 2 + 2 + 2*1 + 1 + 2 + 2 + 2 + 2*1 + 1] = "";
 665         char zone[5 + 1] = "";
 666         struct tm cal;
 667
 668         for (int key = 0; key < HASH_INDEXES; key++) {
 669                 for (mentry = mhash->bucket[key]; mentry; mentry = mentry->next) {
 670                         strmode(mentry->mode, mode);
 671                         localtime_r(&mentry->mtime, &cal);
 672                         strftime(date, sizeof(date), "%F %T", &cal);
 673                         strftime(zone, sizeof(zone), "%z", &cal);
 674                         printf("%s\t%s\t%s\t%s.%09ld %s\t%s%s\n",
 675                                mode,
 676                                mentry->owner, mentry->group,
 677                                date, mentry->mtimensec, zone,
 678                                mentry->path, S_ISDIR(mentry->mode) ? "/" : "");
 679                         for (unsigned i = 0; i < mentry->xattrs; i++) {
 680                                 printf("\t\t\t\t%s%s\t%s=",
 681                                        mentry->path, S_ISDIR(mentry->mode) ? "/" : "",
 682                                        mentry->xattr_names[i]);
 683                                 ssize_t p = 0;
 684                                 for (; p < mentry->xattr_lvalues[i]; p++) {
 685                                         const char ch = mentry->xattr_values[i][p];
 686                                         if ((unsigned)(ch - 32) > 126 - 32) {
 687                                                 p = -1;
 688                                                 break;
 689                                         }
 690                                 }
 691                                 if (p >= 0)
 692                                         printf("\"%.*s\"\n",
 693                                                (int)mentry->xattr_lvalues[i],
 694                                                mentry->xattr_values[i]);
 695                                 else {
 696                                         printf("0x");
 697                                         for (p = 0; p < mentry->xattr_lvalues[i]; p++)
 698                                                 printf("%02hhx", (char)mentry->xattr_values[i][p]);
 699                                         printf("\n");
 700                                 }
 701                         }
 702                 }
 703         }
 704 }