xattrs.c

   1 /*
   2  * Extended Attribute support for rsync.
   3  * Written by Jay Fenlason, vaguely based on the ACLs patch.
   4  *
   5  * Copyright (C) 2004 Red Hat, Inc.
   6  * Copyright (C) 2006-2015 Wayne Davison
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 3 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, visit the http://fsf.org website.
  20  */
  21
  22 #include "rsync.h"
  23 #include "ifuncs.h"
  24 #include "inums.h"
  25 #include "lib/sysxattrs.h"
  26
  27 #ifdef SUPPORT_XATTRS
  28
  29 extern int dry_run;
  30 extern int am_root;
  31 extern int am_sender;
  32 extern int am_generator;
  33 extern int read_only;
  34 extern int list_only;
  35 extern int preserve_xattrs;
  36 extern int preserve_links;
  37 extern int preserve_devices;
  38 extern int preserve_specials;
  39 extern int checksum_seed;
  40
  41 #define RSYNC_XAL_INITIAL 5
  42 #define RSYNC_XAL_LIST_INITIAL 100
  43
  44 #define MAX_FULL_DATUM 32
  45
  46 #define HAS_PREFIX(str, prfx) (*(str) == *(prfx) \
  47                             && strncmp(str, prfx, sizeof (prfx) - 1) == 0)
  48
  49 #define XATTR_ABBREV(x) ((size_t)((x).name - (x).datum) < (x).datum_len)
  50
  51 #define XSTATE_ABBREV   1
  52 #define XSTATE_DONE     2
  53 #define XSTATE_TODO     3
  54
  55 #define USER_PREFIX "user."
  56 #define UPRE_LEN ((int)sizeof USER_PREFIX - 1)
  57 #define SYSTEM_PREFIX "system."
  58 #define SPRE_LEN ((int)sizeof SYSTEM_PREFIX - 1)
  59
  60 #ifdef HAVE_LINUX_XATTRS
  61 #define MIGHT_NEED_RPRE (am_root < 0)
  62 #define RSYNC_PREFIX USER_PREFIX "rsync."
  63 #else
  64 #define MIGHT_NEED_RPRE am_root
  65 #define RSYNC_PREFIX "rsync."
  66 #endif
  67 #define RPRE_LEN ((int)sizeof RSYNC_PREFIX - 1)
  68
  69 #define XSTAT_SUFFIX "stat"
  70 #define XSTAT_ATTR RSYNC_PREFIX "%" XSTAT_SUFFIX
  71 #define XACC_ACL_SUFFIX "aacl"
  72 #define XACC_ACL_ATTR RSYNC_PREFIX "%" XACC_ACL_SUFFIX
  73 #define XDEF_ACL_SUFFIX "dacl"
  74 #define XDEF_ACL_ATTR RSYNC_PREFIX "%" XDEF_ACL_SUFFIX
  75
  76 typedef struct {
  77         char *datum, *name;
  78         size_t datum_len, name_len;
  79         int num;
  80 } rsync_xa;
  81
  82 struct _rsync_xa_list;
  83
  84 typedef struct _rsync_xa_list_ref {
  85         struct _rsync_xa_list_ref *next;
  86         int ndx;
  87 } rsync_xa_list_ref;
  88
  89 typedef struct _rsync_xa_list {
  90         int ndx;
  91         int64 key;
  92         item_list xa_items;
  93 } rsync_xa_list;
  94
  95 static size_t namebuf_len = 0;
  96 static char *namebuf = NULL;
  97
  98 static const rsync_xa_list empty_xa_list = {
  99         .xa_items = EMPTY_ITEM_LIST,
 100 };
 101 static const item_list empty_xattr = EMPTY_ITEM_LIST;
 102 static item_list rsync_xal_l = EMPTY_ITEM_LIST;
 103 static struct hashtable *rsync_xal_h = NULL;
 104
 105 static size_t prior_xattr_count = (size_t)-1;
 106
 107 /* ------------------------------------------------------------------------- */
 108
 109 static void rsync_xal_free(item_list *xalp)
 110 {
 111         size_t i;
 112         rsync_xa *rxas = xalp->items;
 113
 114         if (!xalp->malloced)
 115                 return;
 116
 117         for (i = 0; i < xalp->count; i++) {
 118                 free(rxas[i].datum);
 119                 /*free(rxas[i].name);*/
 120         }
 121         free(xalp->items);
 122 }
 123
 124 void free_xattr(stat_x *sxp)
 125 {
 126         if (!sxp->xattr)
 127                 return;
 128         rsync_xal_free(sxp->xattr);
 129         free(sxp->xattr);
 130         sxp->xattr = NULL;
 131 }
 132
 133 static int rsync_xal_compare_names(const void *x1, const void *x2)
 134 {
 135         const rsync_xa *xa1 = x1;
 136         const rsync_xa *xa2 = x2;
 137         return strcmp(xa1->name, xa2->name);
 138 }
 139
 140 static ssize_t get_xattr_names(const char *fname)
 141 {
 142         ssize_t list_len;
 143         int64 arg;
 144
 145         if (!namebuf) {
 146                 namebuf_len = 1024;
 147                 namebuf = new_array(char, namebuf_len);
 148                 if (!namebuf)
 149                         out_of_memory("get_xattr_names");
 150         }
 151
 152         while (1) {
 153                 /* The length returned includes all the '\0' terminators. */
 154                 list_len = sys_llistxattr(fname, namebuf, namebuf_len);
 155                 if (list_len >= 0) {
 156                         if ((size_t)list_len <= namebuf_len)
 157                                 break;
 158                 } else if (errno == ENOTSUP)
 159                         return 0;
 160                 else if (errno != ERANGE) {
 161                         arg = namebuf_len;
 162                   got_error:
 163                         rsyserr(FERROR_XFER, errno,
 164                                 "get_xattr_names: llistxattr(%s,%s) failed",
 165                                 full_fname(fname), big_num(arg));
 166                         return -1;
 167                 }
 168                 list_len = sys_llistxattr(fname, NULL, 0);
 169                 if (list_len < 0) {
 170                         arg = 0;
 171                         goto got_error;
 172                 }
 173                 if (namebuf_len)
 174                         free(namebuf);
 175                 namebuf_len = list_len + 1024;
 176                 namebuf = new_array(char, namebuf_len);
 177                 if (!namebuf)
 178                         out_of_memory("get_xattr_names");
 179         }
 180
 181         return list_len;
 182 }
 183
 184 /* On entry, the *len_ptr parameter contains the size of the extra space we
 185  * should allocate when we create a buffer for the data.  On exit, it contains
 186  * the length of the datum. */
 187 static char *get_xattr_data(const char *fname, const char *name, size_t *len_ptr,
 188                             int no_missing_error)
 189 {
 190         size_t datum_len = sys_lgetxattr(fname, name, NULL, 0);
 191         size_t extra_len = *len_ptr;
 192         char *ptr;
 193
 194         *len_ptr = datum_len;
 195
 196         if (datum_len == (size_t)-1) {
 197                 if (errno == ENOTSUP || no_missing_error)
 198                         return NULL;
 199                 rsyserr(FERROR_XFER, errno,
 200                         "get_xattr_data: lgetxattr(%s,\"%s\",0) failed",
 201                         full_fname(fname), name);
 202                 return NULL;
 203         }
 204
 205         if (!datum_len && !extra_len)
 206                 extra_len = 1; /* request non-zero amount of memory */
 207         if (datum_len + extra_len < datum_len)
 208                 overflow_exit("get_xattr_data");
 209         if (!(ptr = new_array(char, datum_len + extra_len)))
 210                 out_of_memory("get_xattr_data");
 211
 212         if (datum_len) {
 213                 size_t len = sys_lgetxattr(fname, name, ptr, datum_len);
 214                 if (len != datum_len) {
 215                         if (len == (size_t)-1) {
 216                                 rsyserr(FERROR_XFER, errno,
 217                                     "get_xattr_data: lgetxattr(%s,\"%s\",%ld) failed",
 218                                     full_fname(fname), name, (long)datum_len);
 219                         } else {
 220                                 rprintf(FERROR_XFER,
 221                                     "get_xattr_data: lgetxattr(%s,\"%s\",%ld) returned %ld\n",
 222                                     full_fname(fname), name,
 223                                     (long)datum_len, (long)len);
 224                         }
 225                         free(ptr);
 226                         return NULL;
 227                 }
 228         }
 229
 230         return ptr;
 231 }
 232
 233 static int rsync_xal_get(const char *fname, item_list *xalp)
 234 {
 235         ssize_t list_len, name_len;
 236         size_t datum_len, name_offset;
 237         char *name, *ptr;
 238 #ifdef HAVE_LINUX_XATTRS
 239         int user_only = am_sender ? 0 : !am_root;
 240 #endif
 241         rsync_xa *rxa;
 242         int count;
 243
 244         /* This puts the name list into the "namebuf" buffer. */
 245         if ((list_len = get_xattr_names(fname)) < 0)
 246                 return -1;
 247
 248         for (name = namebuf; list_len > 0; name += name_len) {
 249                 name_len = strlen(name) + 1;
 250                 list_len -= name_len;
 251
 252 #ifdef HAVE_LINUX_XATTRS
 253                 /* Choose between ignoring the system namespace or (non-root) ignoring any non-user namespace. */
 254                 if (user_only ? !HAS_PREFIX(name, USER_PREFIX) : HAS_PREFIX(name, SYSTEM_PREFIX))
 255                         continue;
 256 #endif
 257
 258                 /* No rsync.%FOO attributes are copied w/o 2 -X options. */
 259                 if (name_len > RPRE_LEN && name[RPRE_LEN] == '%' && HAS_PREFIX(name, RSYNC_PREFIX)) {
 260                         if ((am_sender && preserve_xattrs < 2)
 261                          || (am_root < 0
 262                           && (strcmp(name+RPRE_LEN+1, XSTAT_SUFFIX) == 0
 263                            || strcmp(name+RPRE_LEN+1, XACC_ACL_SUFFIX) == 0
 264                            || strcmp(name+RPRE_LEN+1, XDEF_ACL_SUFFIX) == 0)))
 265                                 continue;
 266                 }
 267
 268                 datum_len = name_len; /* Pass extra size to get_xattr_data() */
 269                 if (!(ptr = get_xattr_data(fname, name, &datum_len, 0)))
 270                         return -1;
 271
 272                 if (datum_len > MAX_FULL_DATUM) {
 273                         /* For large datums, we store a flag and a checksum. */
 274                         name_offset = 1 + MAX_DIGEST_LEN;
 275                         sum_init(-1, checksum_seed);
 276                         sum_update(ptr, datum_len);
 277                         free(ptr);
 278
 279                         if (!(ptr = new_array(char, name_offset + name_len)))
 280                                 out_of_memory("rsync_xal_get");
 281                         *ptr = XSTATE_ABBREV;
 282                         sum_end(ptr + 1);
 283                 } else
 284                         name_offset = datum_len;
 285
 286                 rxa = EXPAND_ITEM_LIST(xalp, rsync_xa, RSYNC_XAL_INITIAL);
 287                 rxa->name = ptr + name_offset;
 288                 memcpy(rxa->name, name, name_len);
 289                 rxa->datum = ptr;
 290                 rxa->name_len = name_len;
 291                 rxa->datum_len = datum_len;
 292         }
 293         count = xalp->count;
 294         rxa = xalp->items;
 295         if (count > 1)
 296                 qsort(rxa, count, sizeof (rsync_xa), rsync_xal_compare_names);
 297         for (rxa += count-1; count; count--, rxa--)
 298                 rxa->num = count;
 299         return 0;
 300 }
 301
 302 /* Read the xattr(s) for this filename. */
 303 int get_xattr(const char *fname, stat_x *sxp)
 304 {
 305         sxp->xattr = new(item_list);
 306         *sxp->xattr = empty_xattr;
 307
 308         if (S_ISREG(sxp->st.st_mode) || S_ISDIR(sxp->st.st_mode)) {
 309                 /* Everyone supports this. */
 310         } else if (S_ISLNK(sxp->st.st_mode)) {
 311 #ifndef NO_SYMLINK_XATTRS
 312                 if (!preserve_links)
 313 #endif
 314                         return 0;
 315         } else if (IS_SPECIAL(sxp->st.st_mode)) {
 316 #ifndef NO_SPECIAL_XATTRS
 317                 if (!preserve_specials)
 318 #endif
 319                         return 0;
 320         } else if (IS_DEVICE(sxp->st.st_mode)) {
 321 #ifndef NO_DEVICE_XATTRS
 322                 if (!preserve_devices)
 323 #endif
 324                         return 0;
 325         } else if (IS_MISSING_FILE(sxp->st))
 326                 return 0;
 327
 328         if (rsync_xal_get(fname, sxp->xattr) < 0) {
 329                 free_xattr(sxp);
 330                 return -1;
 331         }
 332         return 0;
 333 }
 334
 335 int copy_xattrs(const char *source, const char *dest)
 336 {
 337         ssize_t list_len, name_len;
 338         size_t datum_len;
 339         char *name, *ptr;
 340 #ifdef HAVE_LINUX_XATTRS
 341         int user_only = am_sender ? 0 : am_root <= 0;
 342 #endif
 343
 344         /* This puts the name list into the "namebuf" buffer. */
 345         if ((list_len = get_xattr_names(source)) < 0)
 346                 return -1;
 347
 348         for (name = namebuf; list_len > 0; name += name_len) {
 349                 name_len = strlen(name) + 1;
 350                 list_len -= name_len;
 351
 352 #ifdef HAVE_LINUX_XATTRS
 353                 /* Choose between ignoring the system namespace or (non-root) ignoring any non-user namespace. */
 354                 if (user_only ? !HAS_PREFIX(name, USER_PREFIX) : HAS_PREFIX(name, SYSTEM_PREFIX))
 355                         continue;
 356 #endif
 357
 358                 datum_len = 0;
 359                 if (!(ptr = get_xattr_data(source, name, &datum_len, 0)))
 360                         return -1;
 361                 if (sys_lsetxattr(dest, name, ptr, datum_len) < 0) {
 362                         int save_errno = errno ? errno : EINVAL;
 363                         rsyserr(FERROR_XFER, errno,
 364                                 "copy_xattrs: lsetxattr(%s,\"%s\") failed",
 365                                 full_fname(dest), name);
 366                         errno = save_errno;
 367                         return -1;
 368                 }
 369                 free(ptr);
 370         }
 371
 372         return 0;
 373 }
 374
 375 static int64 xattr_lookup_hash(const item_list *xalp)
 376 {
 377         const rsync_xa *rxas = xalp->items;
 378         size_t i;
 379         int64 key = hashlittle(&xalp->count, sizeof xalp->count);
 380
 381         for (i = 0; i < xalp->count; i++) {
 382                 key += hashlittle(rxas[i].name, rxas[i].name_len);
 383                 if (rxas[i].datum_len > MAX_FULL_DATUM)
 384                         key += hashlittle(rxas[i].datum, MAX_DIGEST_LEN);
 385                 else
 386                         key += hashlittle(rxas[i].datum, rxas[i].datum_len);
 387         }
 388
 389         if (key == 0) {
 390                 /* This is very unlikely, but we should never
 391                  * return 0 as hashtable_find() doesn't like it. */
 392                 return 1;
 393         }
 394
 395         return key;
 396 }
 397
 398 static int find_matching_xattr(const item_list *xalp)
 399 {
 400         const struct ht_int64_node *node;
 401         const rsync_xa_list_ref *ref;
 402         int64 key;
 403
 404         if (rsync_xal_h == NULL)
 405                 return -1;
 406
 407         key = xattr_lookup_hash(xalp);
 408
 409         node = hashtable_find(rsync_xal_h, key, 0);
 410         if (node == NULL)
 411                 return -1;
 412
 413         if (node->data == NULL)
 414                 return -1;
 415
 416         for (ref = node->data; ref != NULL; ref = ref->next) {
 417                 const rsync_xa_list *ptr = rsync_xal_l.items;
 418                 const rsync_xa *rxas1;
 419                 const rsync_xa *rxas2 = xalp->items;
 420                 size_t j;
 421
 422                 ptr += ref->ndx;
 423                 rxas1 = ptr->xa_items.items;
 424
 425                 /* Wrong number of elements? */
 426                 if (ptr->xa_items.count != xalp->count)
 427                         continue;
 428                 /* any elements different? */
 429                 for (j = 0; j < xalp->count; j++) {
 430                         if (rxas1[j].name_len != rxas2[j].name_len
 431                          || rxas1[j].datum_len != rxas2[j].datum_len
 432                          || strcmp(rxas1[j].name, rxas2[j].name))
 433                                 break;
 434                         if (rxas1[j].datum_len > MAX_FULL_DATUM) {
 435                                 if (memcmp(rxas1[j].datum + 1,
 436                                            rxas2[j].datum + 1,
 437                                            MAX_DIGEST_LEN) != 0)
 438                                         break;
 439                         } else {
 440                                 if (memcmp(rxas1[j].datum, rxas2[j].datum,
 441                                            rxas2[j].datum_len))
 442                                         break;
 443                         }
 444                 }
 445                 /* no differences found.  This is The One! */
 446                 if (j == xalp->count)
 447                         return ref->ndx;
 448         }
 449
 450         return -1;
 451 }
 452
 453 /* Store *xalp on the end of rsync_xal_l */
 454 static int rsync_xal_store(item_list *xalp)
 455 {
 456         struct ht_int64_node *node;
 457         int ndx = rsync_xal_l.count; /* pre-incremented count */
 458         rsync_xa_list *new_list = EXPAND_ITEM_LIST(&rsync_xal_l, rsync_xa_list, RSYNC_XAL_LIST_INITIAL);
 459         rsync_xa_list_ref *new_ref;
 460         /* Since the following call starts a new list, we know it will hold the
 461          * entire initial-count, not just enough space for one new item. */
 462         *new_list = empty_xa_list;
 463         (void)EXPAND_ITEM_LIST(&new_list->xa_items, rsync_xa, xalp->count);
 464         memcpy(new_list->xa_items.items, xalp->items, xalp->count * sizeof (rsync_xa));
 465         new_list->xa_items.count = xalp->count;
 466         xalp->count = 0;
 467
 468         new_list->ndx = ndx;
 469         new_list->key = xattr_lookup_hash(&new_list->xa_items);
 470
 471         if (rsync_xal_h == NULL)
 472                 rsync_xal_h = hashtable_create(512, 1);
 473         if (rsync_xal_h == NULL)
 474                 out_of_memory("rsync_xal_h hashtable_create()");
 475
 476         node = hashtable_find(rsync_xal_h, new_list->key, 1);
 477         if (node == NULL)
 478                 out_of_memory("rsync_xal_h hashtable_find()");
 479
 480         new_ref = new0(rsync_xa_list_ref);
 481         if (new_ref == NULL)
 482                 out_of_memory("new0(rsync_xa_list_ref)");
 483
 484         new_ref->ndx = ndx;
 485
 486         if (node->data != NULL) {
 487                 rsync_xa_list_ref *ref = node->data;
 488
 489                 while (ref != NULL) {
 490                         if (ref->next != NULL) {
 491                                 ref = ref->next;
 492                                 continue;
 493                         }
 494
 495                         ref->next = new_ref;
 496                         break;
 497                 }
 498         } else
 499                 node->data = new_ref;
 500
 501         return ndx;
 502 }
 503
 504 /* Send the make_xattr()-generated xattr list for this flist entry. */
 505 int send_xattr(int f, stat_x *sxp)
 506 {
 507         int ndx = find_matching_xattr(sxp->xattr);
 508
 509         /* Send 0 (-1 + 1) to indicate that literal xattr data follows. */
 510         write_varint(f, ndx + 1);
 511
 512         if (ndx < 0) {
 513                 rsync_xa *rxa;
 514                 int count = sxp->xattr->count;
 515                 write_varint(f, count);
 516                 for (rxa = sxp->xattr->items; count--; rxa++) {
 517                         size_t name_len = rxa->name_len;
 518                         const char *name = rxa->name;
 519                         /* Strip the rsync prefix from disguised namespaces. */
 520                         if (name_len > RPRE_LEN
 521 #ifdef HAVE_LINUX_XATTRS
 522                          && am_root < 0
 523 #endif
 524                          && name[RPRE_LEN] != '%' && HAS_PREFIX(name, RSYNC_PREFIX)) {
 525                                 name += RPRE_LEN;
 526                                 name_len -= RPRE_LEN;
 527                         }
 528 #ifndef HAVE_LINUX_XATTRS
 529                         else {
 530                                 /* Put everything else in the user namespace. */
 531                                 name_len += UPRE_LEN;
 532                         }
 533 #endif
 534                         write_varint(f, name_len);
 535                         write_varint(f, rxa->datum_len);
 536 #ifndef HAVE_LINUX_XATTRS
 537                         if (name_len > rxa->name_len) {
 538                                 write_buf(f, USER_PREFIX, UPRE_LEN);
 539                                 name_len -= UPRE_LEN;
 540                         }
 541 #endif
 542                         write_buf(f, name, name_len);
 543                         if (rxa->datum_len > MAX_FULL_DATUM)
 544                                 write_buf(f, rxa->datum + 1, MAX_DIGEST_LEN);
 545                         else
 546                                 write_bigbuf(f, rxa->datum, rxa->datum_len);
 547                 }
 548                 ndx = rsync_xal_store(sxp->xattr); /* adds item to rsync_xal_l */
 549         }
 550
 551         return ndx;
 552 }
 553
 554 /* Return a flag indicating if we need to change a file's xattrs.  If
 555  * "find_all" is specified, also mark any abbreviated xattrs that we
 556  * need so that send_xattr_request() can tell the sender about them. */
 557 int xattr_diff(struct file_struct *file, stat_x *sxp, int find_all)
 558 {
 559         const rsync_xa_list *glst = rsync_xal_l.items;
 560         const item_list *lst;
 561         rsync_xa *snd_rxa, *rec_rxa;
 562         int snd_cnt, rec_cnt;
 563         int cmp, same, xattrs_equal = 1;
 564
 565         if (sxp && XATTR_READY(*sxp)) {
 566                 rec_rxa = sxp->xattr->items;
 567                 rec_cnt = sxp->xattr->count;
 568         } else {
 569                 rec_rxa = NULL;
 570                 rec_cnt = 0;
 571         }
 572
 573         if (F_XATTR(file) >= 0) {
 574                 glst += F_XATTR(file);
 575                 lst = &glst->xa_items;
 576         } else
 577                 lst = &empty_xattr;
 578
 579         snd_rxa = lst->items;
 580         snd_cnt = lst->count;
 581
 582         /* If the count of the sender's xattrs is different from our
 583          * (receiver's) xattrs, the lists are not the same. */
 584         if (snd_cnt != rec_cnt) {
 585                 if (!find_all)
 586                         return 1;
 587                 xattrs_equal = 0;
 588         }
 589
 590         while (snd_cnt) {
 591                 cmp = rec_cnt ? strcmp(snd_rxa->name, rec_rxa->name) : -1;
 592                 if (cmp > 0)
 593                         same = 0;
 594                 else if (snd_rxa->datum_len > MAX_FULL_DATUM) {
 595                         same = cmp == 0 && snd_rxa->datum_len == rec_rxa->datum_len
 596                             && memcmp(snd_rxa->datum + 1, rec_rxa->datum + 1,
 597                                       MAX_DIGEST_LEN) == 0;
 598                         /* Flag unrequested items that we need. */
 599                         if (!same && find_all && snd_rxa->datum[0] == XSTATE_ABBREV)
 600                                 snd_rxa->datum[0] = XSTATE_TODO;
 601                 } else {
 602                         same = cmp == 0 && snd_rxa->datum_len == rec_rxa->datum_len
 603                             && memcmp(snd_rxa->datum, rec_rxa->datum,
 604                                       snd_rxa->datum_len) == 0;
 605                 }
 606                 if (!same) {
 607                         if (!find_all)
 608                                 return 1;
 609                         xattrs_equal = 0;
 610                 }
 611
 612                 if (cmp <= 0) {
 613                         snd_rxa++;
 614                         snd_cnt--;
 615                 }
 616                 if (cmp >= 0) {
 617                         rec_rxa++;
 618                         rec_cnt--;
 619                 }
 620         }
 621
 622         if (rec_cnt)
 623                 xattrs_equal = 0;
 624
 625         return !xattrs_equal;
 626 }
 627
 628 /* When called by the generator (with a NULL fname), this tells the sender
 629  * all the abbreviated xattr values we need.  When called by the sender
 630  * (with a non-NULL fname), we send all the extra xattr data it needs.
 631  * The generator may also call with f_out < 0 to just change all the
 632  * XSTATE_ABBREV states into XSTATE_DONE. */
 633 void send_xattr_request(const char *fname, struct file_struct *file, int f_out)
 634 {
 635         const rsync_xa_list *glst = rsync_xal_l.items;
 636         const item_list *lst;
 637         int cnt, prior_req = 0;
 638         rsync_xa *rxa;
 639
 640         glst += F_XATTR(file);
 641         lst = &glst->xa_items;
 642
 643         for (rxa = lst->items, cnt = lst->count; cnt--; rxa++) {
 644                 if (rxa->datum_len <= MAX_FULL_DATUM)
 645                         continue;
 646                 switch (rxa->datum[0]) {
 647                 case XSTATE_ABBREV:
 648                         /* Items left abbreviated matched the sender's checksum, so
 649                          * the receiver will cache the local data for future use. */
 650                         if (am_generator)
 651                                 rxa->datum[0] = XSTATE_DONE;
 652                         continue;
 653                 case XSTATE_TODO:
 654                         assert(f_out >= 0);
 655                         break;
 656                 default:
 657                         continue;
 658                 }
 659
 660                 /* Flag that we handled this abbreviated item. */
 661                 rxa->datum[0] = XSTATE_DONE;
 662
 663                 write_varint(f_out, rxa->num - prior_req);
 664                 prior_req = rxa->num;
 665
 666                 if (fname) {
 667                         size_t len = 0;
 668                         char *ptr;
 669
 670                         /* Re-read the long datum. */
 671                         if (!(ptr = get_xattr_data(fname, rxa->name, &len, 0))) {
 672                                 rprintf(FERROR_XFER, "failed to re-read xattr %s for %s\n", rxa->name, fname);
 673                                 write_varint(f_out, 0);
 674                                 continue;
 675                         }
 676
 677                         write_varint(f_out, len); /* length might have changed! */
 678                         write_bigbuf(f_out, ptr, len);
 679                         free(ptr);
 680                 }
 681         }
 682
 683         if (f_out >= 0)
 684                 write_byte(f_out, 0); /* end the list */
 685 }
 686
 687 /* When called by the sender, read the request from the generator and mark
 688  * any needed xattrs with a flag that lets us know they need to be sent to
 689  * the receiver.  When called by the receiver, reads the sent data and
 690  * stores it in place of its checksum. */
 691 int recv_xattr_request(struct file_struct *file, int f_in)
 692 {
 693         const rsync_xa_list *glst = rsync_xal_l.items;
 694         const item_list *lst;
 695         char *old_datum, *name;
 696         rsync_xa *rxa;
 697         int rel_pos, cnt, num, got_xattr_data = 0;
 698
 699         if (F_XATTR(file) < 0) {
 700                 rprintf(FERROR, "recv_xattr_request: internal data error!\n");
 701                 exit_cleanup(RERR_PROTOCOL);
 702         }
 703         glst += F_XATTR(file);
 704         lst = &glst->xa_items;
 705
 706         cnt = lst->count;
 707         rxa = lst->items;
 708         num = 0;
 709         while ((rel_pos = read_varint(f_in)) != 0) {
 710                 num += rel_pos;
 711                 if (am_sender) {
 712                         /* The sender-related num values are only in order on the sender.
 713                          * We use that order here to scan foward or backward as needed. */
 714                         if (rel_pos < 0) {
 715                                 while (cnt < (int)lst->count && rxa->num > num) {
 716                                         rxa--;
 717                                         cnt++;
 718                                 }
 719                         } else {
 720                                 while (cnt > 1 && rxa->num < num) {
 721                                         rxa++;
 722                                         cnt--;
 723                                 }
 724                         }
 725                 } else {
 726                         int j;
 727                         /* The receiving side has no known num order, so we just scan
 728                          * forward (w/wrap) and hope that the next value is near by. */
 729                         for (j = lst->count; j > 1 && rxa->num != num; j--) {
 730                                 if (--cnt)
 731                                         rxa++;
 732                                 else {
 733                                         cnt = lst->count;
 734                                         rxa = lst->items;
 735                                 }
 736                         }
 737                 }
 738                 if (!cnt || rxa->num != num) {
 739                         rprintf(FERROR, "[%s] could not find xattr #%d for %s\n",
 740                                 who_am_i(), num, f_name(file, NULL));
 741                         exit_cleanup(RERR_PROTOCOL);
 742                 }
 743                 if (!XATTR_ABBREV(*rxa) || rxa->datum[0] != XSTATE_ABBREV) {
 744                         rprintf(FERROR, "[%s] internal abbrev error on %s (%s, len=%ld)!\n",
 745                                 who_am_i(), f_name(file, NULL), rxa->name, (long)rxa->datum_len);
 746                         exit_cleanup(RERR_PROTOCOL);
 747                 }
 748
 749                 if (am_sender) {
 750                         rxa->datum[0] = XSTATE_TODO;
 751                         continue;
 752                 }
 753
 754                 old_datum = rxa->datum;
 755                 rxa->datum_len = read_varint(f_in);
 756
 757                 if (rxa->name_len + rxa->datum_len < rxa->name_len)
 758                         overflow_exit("recv_xattr_request");
 759                 rxa->datum = new_array(char, rxa->datum_len + rxa->name_len);
 760                 if (!rxa->datum)
 761                         out_of_memory("recv_xattr_request");
 762                 name = rxa->datum + rxa->datum_len;
 763                 memcpy(name, rxa->name, rxa->name_len);
 764                 rxa->name = name;
 765                 free(old_datum);
 766                 read_buf(f_in, rxa->datum, rxa->datum_len);
 767                 got_xattr_data = 1;
 768         }
 769
 770         return got_xattr_data;
 771 }
 772
 773 /* ------------------------------------------------------------------------- */
 774
 775 /* receive and build the rsync_xattr_lists */
 776 void receive_xattr(int f, struct file_struct *file)
 777 {
 778         static item_list temp_xattr = EMPTY_ITEM_LIST;
 779         int count, num;
 780 #ifdef HAVE_LINUX_XATTRS
 781         int need_sort = 0;
 782 #else
 783         int need_sort = 1;
 784 #endif
 785         int ndx = read_varint(f);
 786
 787         if (ndx < 0 || (size_t)ndx > rsync_xal_l.count) {
 788                 rprintf(FERROR, "receive_xattr: xa index %d out of"
 789                         " range for %s\n", ndx, f_name(file, NULL));
 790                 exit_cleanup(RERR_STREAMIO);
 791         }
 792
 793         if (ndx != 0) {
 794                 F_XATTR(file) = ndx - 1;
 795                 return;
 796         }
 797
 798         if ((count = read_varint(f)) != 0) {
 799                 (void)EXPAND_ITEM_LIST(&temp_xattr, rsync_xa, count);
 800                 temp_xattr.count = 0;
 801         }
 802
 803         for (num = 1; num <= count; num++) {
 804                 char *ptr, *name;
 805                 rsync_xa *rxa;
 806                 size_t name_len = read_varint(f);
 807                 size_t datum_len = read_varint(f);
 808                 size_t dget_len = datum_len > MAX_FULL_DATUM ? 1 + MAX_DIGEST_LEN : datum_len;
 809                 size_t extra_len = MIGHT_NEED_RPRE ? RPRE_LEN : 0;
 810                 if ((dget_len + extra_len < dget_len)
 811                  || (dget_len + extra_len + name_len < dget_len))
 812                         overflow_exit("receive_xattr");
 813                 ptr = new_array(char, dget_len + extra_len + name_len);
 814                 if (!ptr)
 815                         out_of_memory("receive_xattr");
 816                 name = ptr + dget_len + extra_len;
 817                 read_buf(f, name, name_len);
 818                 if (dget_len == datum_len)
 819                         read_buf(f, ptr, dget_len);
 820                 else {
 821                         *ptr = XSTATE_ABBREV;
 822                         read_buf(f, ptr + 1, MAX_DIGEST_LEN);
 823                 }
 824 #ifdef HAVE_LINUX_XATTRS
 825                 /* Non-root can only save the user namespace. */
 826                 if (am_root <= 0 && !HAS_PREFIX(name, USER_PREFIX)) {
 827                         if (!am_root) {
 828                                 free(ptr);
 829                                 continue;
 830                         }
 831                         name -= RPRE_LEN;
 832                         name_len += RPRE_LEN;
 833                         memcpy(name, RSYNC_PREFIX, RPRE_LEN);
 834                         need_sort = 1;
 835                 }
 836 #else
 837                 /* This OS only has a user namespace, so we either
 838                  * strip the user prefix, or we put a non-user
 839                  * namespace inside our rsync hierarchy. */
 840                 if (HAS_PREFIX(name, USER_PREFIX)) {
 841                         name += UPRE_LEN;
 842                         name_len -= UPRE_LEN;
 843                 } else if (am_root) {
 844                         name -= RPRE_LEN;
 845                         name_len += RPRE_LEN;
 846                         memcpy(name, RSYNC_PREFIX, RPRE_LEN);
 847                 } else {
 848                         free(ptr);
 849                         continue;
 850                 }
 851 #endif
 852                 /* No rsync.%FOO attributes are copied w/o 2 -X options. */
 853                 if (preserve_xattrs < 2 && name_len > RPRE_LEN
 854                  && name[RPRE_LEN] == '%' && HAS_PREFIX(name, RSYNC_PREFIX)) {
 855                         free(ptr);
 856                         continue;
 857                 }
 858
 859                 rxa = EXPAND_ITEM_LIST(&temp_xattr, rsync_xa, 1);
 860                 rxa->name = name;
 861                 rxa->datum = ptr;
 862                 rxa->name_len = name_len;
 863                 rxa->datum_len = datum_len;
 864                 rxa->num = num;
 865         }
 866
 867         if (need_sort && count > 1)
 868                 qsort(temp_xattr.items, count, sizeof (rsync_xa), rsync_xal_compare_names);
 869
 870         ndx = rsync_xal_store(&temp_xattr); /* adds item to rsync_xal_l */
 871
 872         F_XATTR(file) = ndx;
 873 }
 874
 875 /* Turn the xattr data in stat_x into cached xattr data, setting the index
 876  * values in the file struct. */
 877 void cache_tmp_xattr(struct file_struct *file, stat_x *sxp)
 878 {
 879         int ndx;
 880
 881         if (!sxp->xattr)
 882                 return;
 883
 884         if (prior_xattr_count == (size_t)-1)
 885                 prior_xattr_count = rsync_xal_l.count;
 886         ndx = find_matching_xattr(sxp->xattr);
 887         if (ndx < 0)
 888                 rsync_xal_store(sxp->xattr); /* adds item to rsync_xal_l */
 889
 890         F_XATTR(file) = ndx;
 891 }
 892
 893 void uncache_tmp_xattrs(void)
 894 {
 895         if (prior_xattr_count != (size_t)-1) {
 896                 rsync_xa_list *xa_list_item = rsync_xal_l.items;
 897                 rsync_xa_list *xa_list_start = xa_list_item + prior_xattr_count;
 898                 xa_list_item += rsync_xal_l.count;
 899                 rsync_xal_l.count = prior_xattr_count;
 900                 while (xa_list_item-- > xa_list_start) {
 901                         struct ht_int64_node *node;
 902                         rsync_xa_list_ref *ref;
 903
 904                         rsync_xal_free(&xa_list_item->xa_items);
 905
 906                         if (rsync_xal_h == NULL)
 907                                 continue;
 908
 909                         node = hashtable_find(rsync_xal_h, xa_list_item->key, 0);
 910                         if (node == NULL)
 911                                 continue;
 912
 913                         if (node->data == NULL)
 914                                 continue;
 915
 916                         ref = node->data;
 917                         if (xa_list_item->ndx == ref->ndx) {
 918                                 /* xa_list_item is the first in the list. */
 919                                 node->data = ref->next;
 920                                 free(ref);
 921                                 continue;
 922                         }
 923
 924                         while (ref != NULL) {
 925                                 if (ref->next == NULL) {
 926                                         ref = NULL;
 927                                         break;
 928                                 }
 929                                 if (xa_list_item->ndx == ref->next->ndx) {
 930                                         ref->next = ref->next->next;
 931                                         free(ref);
 932                                         break;
 933                                 }
 934                                 ref = ref->next;
 935                         }
 936                 }
 937                 prior_xattr_count = (size_t)-1;
 938         }
 939 }
 940
 941 static int rsync_xal_set(const char *fname, item_list *xalp,
 942                          const char *fnamecmp, stat_x *sxp)
 943 {
 944         rsync_xa *rxas = xalp->items;
 945         ssize_t list_len;
 946         size_t i, len;
 947         char *name, *ptr, sum[MAX_DIGEST_LEN];
 948 #ifdef HAVE_LINUX_XATTRS
 949         int user_only = am_root <= 0;
 950 #endif
 951         size_t name_len;
 952         int ret = 0;
 953
 954         /* This puts the current name list into the "namebuf" buffer. */
 955         if ((list_len = get_xattr_names(fname)) < 0)
 956                 return -1;
 957
 958         for (i = 0; i < xalp->count; i++) {
 959                 name = rxas[i].name;
 960
 961                 if (XATTR_ABBREV(rxas[i])) {
 962                         /* See if the fnamecmp version is identical. */
 963                         len = name_len = rxas[i].name_len;
 964                         if ((ptr = get_xattr_data(fnamecmp, name, &len, 1)) == NULL) {
 965                           still_abbrev:
 966                                 if (am_generator)
 967                                         continue;
 968                                 rprintf(FERROR, "Missing abbreviated xattr value, %s, for %s\n",
 969                                         rxas[i].name, full_fname(fname));
 970                                 ret = -1;
 971                                 continue;
 972                         }
 973                         if (len != rxas[i].datum_len) {
 974                                 free(ptr);
 975                                 goto still_abbrev;
 976                         }
 977
 978                         sum_init(-1, checksum_seed);
 979                         sum_update(ptr, len);
 980                         sum_end(sum);
 981                         if (memcmp(sum, rxas[i].datum + 1, MAX_DIGEST_LEN) != 0) {
 982                                 free(ptr);
 983                                 goto still_abbrev;
 984                         }
 985
 986                         if (fname == fnamecmp)
 987                                 ; /* Value is already set when identical */
 988                         else if (sys_lsetxattr(fname, name, ptr, len) < 0) {
 989                                 rsyserr(FERROR_XFER, errno,
 990                                         "rsync_xal_set: lsetxattr(%s,\"%s\") failed",
 991                                         full_fname(fname), name);
 992                                 ret = -1;
 993                         } else /* make sure caller sets mtime */
 994                                 sxp->st.st_mtime = (time_t)-1;
 995
 996                         if (am_generator) { /* generator items stay abbreviated */
 997                                 free(ptr);
 998                                 continue;
 999                         }
1000
1001                         memcpy(ptr + len, name, name_len);
1002                         free(rxas[i].datum);
1003
1004                         rxas[i].name = name = ptr + len;
1005                         rxas[i].datum = ptr;
1006                         continue;
1007                 }
1008
1009                 if (sys_lsetxattr(fname, name, rxas[i].datum, rxas[i].datum_len) < 0) {
1010                         rsyserr(FERROR_XFER, errno,
1011                                 "rsync_xal_set: lsetxattr(%s,\"%s\") failed",
1012                                 full_fname(fname), name);
1013                         ret = -1;
1014                 } else /* make sure caller sets mtime */
1015                         sxp->st.st_mtime = (time_t)-1;
1016         }
1017
1018         /* Remove any extraneous names. */
1019         for (name = namebuf; list_len > 0; name += name_len) {
1020                 name_len = strlen(name) + 1;
1021                 list_len -= name_len;
1022
1023 #ifdef HAVE_LINUX_XATTRS
1024                 /* Choose between ignoring the system namespace or (non-root) ignoring any non-user namespace. */
1025                 if (user_only ? !HAS_PREFIX(name, USER_PREFIX) : HAS_PREFIX(name, SYSTEM_PREFIX))
1026                         continue;
1027 #endif
1028                 if (am_root < 0 && name_len > RPRE_LEN && name[RPRE_LEN] == '%' && strcmp(name, XSTAT_ATTR) == 0)
1029                         continue;
1030
1031                 for (i = 0; i < xalp->count; i++) {
1032                         if (strcmp(name, rxas[i].name) == 0)
1033                                 break;
1034                 }
1035                 if (i == xalp->count) {
1036                         if (sys_lremovexattr(fname, name) < 0) {
1037                                 rsyserr(FERROR_XFER, errno,
1038                                         "rsync_xal_set: lremovexattr(%s,\"%s\") failed",
1039                                         full_fname(fname), name);
1040                                 ret = -1;
1041                         } else /* make sure caller sets mtime */
1042                                 sxp->st.st_mtime = (time_t)-1;
1043                 }
1044         }
1045
1046         return ret;
1047 }
1048
1049 /* Set extended attributes on indicated filename. */
1050 int set_xattr(const char *fname, const struct file_struct *file,
1051               const char *fnamecmp, stat_x *sxp)
1052 {
1053         rsync_xa_list *glst = rsync_xal_l.items;
1054         item_list *lst;
1055         int ndx;
1056
1057         if (dry_run)
1058                 return 1; /* FIXME: --dry-run needs to compute this value */
1059
1060         if (read_only || list_only) {
1061                 errno = EROFS;
1062                 return -1;
1063         }
1064
1065 #ifdef NO_SPECIAL_XATTRS
1066         if (IS_SPECIAL(sxp->st.st_mode)) {
1067                 errno = ENOTSUP;
1068                 return -1;
1069         }
1070 #endif
1071 #ifdef NO_DEVICE_XATTRS
1072         if (IS_DEVICE(sxp->st.st_mode)) {
1073                 errno = ENOTSUP;
1074                 return -1;
1075         }
1076 #endif
1077 #ifdef NO_SYMLINK_XATTRS
1078         if (S_ISLNK(sxp->st.st_mode)) {
1079                 errno = ENOTSUP;
1080                 return -1;
1081         }
1082 #endif
1083
1084         ndx = F_XATTR(file);
1085         glst += ndx;
1086         lst = &glst->xa_items;
1087         return rsync_xal_set(fname, lst, fnamecmp, sxp);
1088 }
1089
1090 #ifdef SUPPORT_ACLS
1091 char *get_xattr_acl(const char *fname, int is_access_acl, size_t *len_p)
1092 {
1093         const char *name = is_access_acl ? XACC_ACL_ATTR : XDEF_ACL_ATTR;
1094         *len_p = 0; /* no extra data alloc needed from get_xattr_data() */
1095         return get_xattr_data(fname, name, len_p, 1);
1096 }
1097
1098 int set_xattr_acl(const char *fname, int is_access_acl, const char *buf, size_t buf_len)
1099 {
1100         const char *name = is_access_acl ? XACC_ACL_ATTR : XDEF_ACL_ATTR;
1101         if (sys_lsetxattr(fname, name, buf, buf_len) < 0) {
1102                 rsyserr(FERROR_XFER, errno,
1103                         "set_xattr_acl: lsetxattr(%s,\"%s\") failed",
1104                         full_fname(fname), name);
1105                 return -1;
1106         }
1107         return 0;
1108 }
1109
1110 int del_def_xattr_acl(const char *fname)
1111 {
1112         return sys_lremovexattr(fname, XDEF_ACL_ATTR);
1113 }
1114 #endif
1115
1116 int get_stat_xattr(const char *fname, int fd, STRUCT_STAT *fst, STRUCT_STAT *xst)
1117 {
1118         int mode, rdev_major, rdev_minor, uid, gid, len;
1119         char buf[256];
1120
1121         if (am_root >= 0 || IS_DEVICE(fst->st_mode) || IS_SPECIAL(fst->st_mode))
1122                 return -1;
1123
1124         if (xst)
1125                 *xst = *fst;
1126         else
1127                 xst = fst;
1128         if (fname) {
1129                 fd = -1;
1130                 len = sys_lgetxattr(fname, XSTAT_ATTR, buf, sizeof buf - 1);
1131         } else {
1132                 fname = "fd";
1133                 len = sys_fgetxattr(fd, XSTAT_ATTR, buf, sizeof buf - 1);
1134         }
1135         if (len >= (int)sizeof buf) {
1136                 len = -1;
1137                 errno = ERANGE;
1138         }
1139         if (len < 0) {
1140                 if (errno == ENOTSUP || errno == ENOATTR)
1141                         return -1;
1142                 if (errno == EPERM && S_ISLNK(fst->st_mode)) {
1143                         xst->st_uid = 0;
1144                         xst->st_gid = 0;
1145                         return 0;
1146                 }
1147                 rsyserr(FERROR_XFER, errno, "failed to read xattr %s for %s",
1148                         XSTAT_ATTR, full_fname(fname));
1149                 return -1;
1150         }
1151         buf[len] = '\0';
1152
1153         if (sscanf(buf, "%o %d,%d %d:%d",
1154                    &mode, &rdev_major, &rdev_minor, &uid, &gid) != 5) {
1155                 rprintf(FERROR, "Corrupt %s xattr attached to %s: \"%s\"\n",
1156                         XSTAT_ATTR, full_fname(fname), buf);
1157                 exit_cleanup(RERR_FILEIO);
1158         }
1159
1160         xst->st_mode = from_wire_mode(mode);
1161         xst->st_rdev = MAKEDEV(rdev_major, rdev_minor);
1162         xst->st_uid = uid;
1163         xst->st_gid = gid;
1164
1165         return 0;
1166 }
1167
1168 int set_stat_xattr(const char *fname, struct file_struct *file, mode_t new_mode)
1169 {
1170         STRUCT_STAT fst, xst;
1171         dev_t rdev;
1172         mode_t mode, fmode;
1173
1174         if (dry_run)
1175                 return 0;
1176
1177         if (read_only || list_only) {
1178                 rsyserr(FERROR_XFER, EROFS, "failed to write xattr %s for %s",
1179                         XSTAT_ATTR, full_fname(fname));
1180                 return -1;
1181         }
1182
1183         if (x_lstat(fname, &fst, &xst) < 0) {
1184                 rsyserr(FERROR_XFER, errno, "failed to re-stat %s",
1185                         full_fname(fname));
1186                 return -1;
1187         }
1188
1189         fst.st_mode &= (_S_IFMT | CHMOD_BITS);
1190         fmode = new_mode & (_S_IFMT | CHMOD_BITS);
1191
1192         if (IS_DEVICE(fmode)) {
1193                 uint32 *devp = F_RDEV_P(file);
1194                 rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
1195         } else
1196                 rdev = 0;
1197
1198         /* Dump the special permissions and enable full owner access. */
1199         mode = (fst.st_mode & _S_IFMT) | (fmode & ACCESSPERMS)
1200              | (S_ISDIR(fst.st_mode) ? 0700 : 0600);
1201         if (fst.st_mode != mode)
1202                 do_chmod(fname, mode);
1203         if (!IS_DEVICE(fst.st_mode))
1204                 fst.st_rdev = 0; /* just in case */
1205
1206         if (mode == fmode && fst.st_rdev == rdev
1207          && fst.st_uid == F_OWNER(file) && fst.st_gid == F_GROUP(file)) {
1208                 /* xst.st_mode will be 0 if there's no current stat xattr */
1209                 if (xst.st_mode && sys_lremovexattr(fname, XSTAT_ATTR) < 0) {
1210                         rsyserr(FERROR_XFER, errno,
1211                                 "delete of stat xattr failed for %s",
1212                                 full_fname(fname));
1213                         return -1;
1214                 }
1215                 return 0;
1216         }
1217
1218         if (xst.st_mode != fmode || xst.st_rdev != rdev
1219          || xst.st_uid != F_OWNER(file) || xst.st_gid != F_GROUP(file)) {
1220                 char buf[256];
1221                 int len = snprintf(buf, sizeof buf, "%o %u,%u %u:%u",
1222                         to_wire_mode(fmode),
1223                         (int)major(rdev), (int)minor(rdev),
1224                         F_OWNER(file), F_GROUP(file));
1225                 if (sys_lsetxattr(fname, XSTAT_ATTR, buf, len) < 0) {
1226                         if (errno == EPERM && S_ISLNK(fst.st_mode))
1227                                 return 0;
1228                         rsyserr(FERROR_XFER, errno,
1229                                 "failed to write xattr %s for %s",
1230                                 XSTAT_ATTR, full_fname(fname));
1231                         return -1;
1232                 }
1233         }
1234
1235         return 0;
1236 }
1237
1238 int x_stat(const char *fname, STRUCT_STAT *fst, STRUCT_STAT *xst)
1239 {
1240         int ret = do_stat(fname, fst);
1241         if ((ret < 0 || get_stat_xattr(fname, -1, fst, xst) < 0) && xst)
1242                 xst->st_mode = 0;
1243         return ret;
1244 }
1245
1246 int x_lstat(const char *fname, STRUCT_STAT *fst, STRUCT_STAT *xst)
1247 {
1248         int ret = do_lstat(fname, fst);
1249         if ((ret < 0 || get_stat_xattr(fname, -1, fst, xst) < 0) && xst)
1250                 xst->st_mode = 0;
1251         return ret;
1252 }
1253
1254 int x_fstat(int fd, STRUCT_STAT *fst, STRUCT_STAT *xst)
1255 {
1256         int ret = do_fstat(fd, fst);
1257         if ((ret < 0 || get_stat_xattr(NULL, fd, fst, xst) < 0) && xst)
1258                 xst->st_mode = 0;
1259         return ret;
1260 }
1261
1262 #endif /* SUPPORT_XATTRS */