restore/xattr.c

   1 /*
   2  * Copyright (c) 1999-2004
   3  *      Stelian Pop <stelian@popies.net>, 1999-2004
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #ifndef lint
  31 static const char rcsid[] =
  32         "$Id: xattr.c,v 1.2 2005/06/08 09:34:40 stelian Exp $";
  33 #endif /* not lint */
  34
  35 #include <config.h>
  36 #include <compatlfs.h>
  37 #include <compaterr.h>
  38 #include <sys/types.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <unistd.h>
  43 #include <errno.h>
  44 #include <bsdcompat.h>
  45 #include <protocols/dumprestore.h>
  46 #include "restore.h"
  47 #include "extern.h"
  48 #include "pathnames.h"
  49
  50 /*
  51  * Data structures below taken from the kernel
  52  */
  53
  54 /* Maximum number of references to one attribute block */
  55 #define EXT2_XATTR_REFCOUNT_MAX         1024
  56
  57 /* Name indexes */
  58 #define EXT2_XATTR_INDEX_MAX                    10
  59 #define EXT2_XATTR_INDEX_USER                   1
  60 #define EXT2_XATTR_INDEX_POSIX_ACL_ACCESS       2
  61 #define EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT      3
  62 #define EXT2_XATTR_INDEX_TRUSTED                4
  63 #define EXT2_XATTR_INDEX_LUSTRE                 5
  64 #define EXT2_XATTR_INDEX_SECURITY               6
  65
  66 struct ext2_xattr_header {
  67         u_int32_t       h_magic;        /* magic number for identification */
  68         u_int32_t       h_refcount;     /* reference count */
  69         u_int32_t       h_blocks;       /* number of disk blocks used */
  70         u_int32_t       h_hash;         /* hash value of all attributes */
  71         u_int32_t       h_reserved[4];  /* zero right now */
  72 };
  73
  74 struct ext3_xattr_ibody_header {
  75         u_int32_t       h_magic;        /* magic number for identification */
  76 };
  77
  78 struct ext2_xattr_entry {
  79         u_char          e_name_len;     /* length of name */
  80         u_char          e_name_index;   /* attribute name index */
  81         u_int16_t       e_value_offs;   /* offset in disk block of value */
  82         u_int32_t       e_value_block;  /* disk block attribute is stored on (n/i) */
  83         u_int32_t       e_value_size;   /* size of attribute value */
  84         u_int32_t       e_hash;         /* hash value of name and value */
  85         char            e_name[0];      /* attribute name */
  86 };
  87
  88 #define EXT2_XATTR_PAD_BITS             2
  89 #define EXT2_XATTR_PAD          (1<<EXT2_XATTR_PAD_BITS)
  90 #define EXT2_XATTR_ROUND                (EXT2_XATTR_PAD-1)
  91 #define EXT2_XATTR_LEN(name_len) \
  92         (((name_len) + EXT2_XATTR_ROUND + \
  93         sizeof(struct ext2_xattr_entry)) & ~EXT2_XATTR_ROUND)
  94 #define EXT2_XATTR_NEXT(entry) \
  95         ( (struct ext2_xattr_entry *)( \
  96           (char *)(entry) + EXT2_XATTR_LEN((entry)->e_name_len)) )
  97 #define EXT3_XATTR_SIZE(size) \
  98         (((size) + EXT2_XATTR_ROUND) & ~EXT2_XATTR_ROUND)
  99
 100 #define HDR(buffer) ((struct ext2_xattr_header *)(buffer))
 101 #define ENTRY(ptr) ((struct ext2_xattr_entry *)(ptr))
 102 #define IS_LAST_ENTRY(entry) (*(__u32 *)(entry) == 0)
 103
 104 #define BFIRST(buffer) ENTRY(HDR(buffer)+1)
 105 #define IFIRST(buffer) ENTRY(((struct ext3_xattr_ibody_header *)(buffer))+1)
 106
 107 #define FIRST_ENTRY(buffer) \
 108         ((HDR(buffer)->h_magic == EXT2_XATTR_MAGIC2) ? \
 109                 IFIRST(buffer) : \
 110                 BFIRST(buffer))
 111
 112 /*
 113  * On-block xattr value offsets start at the beginning of the block, but
 114  * on-inode xattr value offsets start after the initial header
 115  * (ext3_xattr_ibody_header).
 116  */
 117 #define VALUE_OFFSET(buffer, entry) \
 118         (((HDR(buffer)->h_magic == EXT2_XATTR_MAGIC2) ? \
 119                 (entry)->e_value_offs + sizeof(struct ext3_xattr_ibody_header) : \
 120                 (entry)->e_value_offs))
 121
 122 /*
 123  * xattr syscalls do not exist yet in libc, get our own copy here,
 124  * taken from libattr.
 125  */
 126 #if defined (__i386__)
 127 # define HAVE_XATTR_SYSCALLS 1
 128 # define __NR_lsetxattr         227
 129 # define __NR_lgetxattr         230
 130 # define __NR_llistxattr        233
 131 #elif defined (__sparc__)
 132 # define HAVE_XATTR_SYSCALLS 1
 133 # define __NR_lsetxattr         170
 134 # define __NR_lgetxattr         173
 135 # define __NR_llistxattr        179
 136 #elif defined (__ia64__)
 137 # define HAVE_XATTR_SYSCALLS 1
 138 # define __NR_lsetxattr         1218
 139 # define __NR_lgetxattr         1221
 140 # define __NR_llistxattr        1224
 141 #elif defined (__powerpc__)
 142 # define HAVE_XATTR_SYSCALLS 1
 143 # define __NR_lsetxattr         210
 144 # define __NR_lgetxattr         213
 145 # define __NR_llistxattr        216
 146 #elif defined (__x86_64__)
 147 # define HAVE_XATTR_SYSCALLS 1
 148 # define __NR_lsetxattr         189
 149 # define __NR_lgetxattr         192
 150 # define __NR_llistxattr        195
 151 #elif defined (__s390__)
 152 # define HAVE_XATTR_SYSCALLS 1
 153 # define __NR_lsetxattr         225
 154 # define __NR_lgetxattr         228
 155 # define __NR_llistxattr        231
 156 #elif defined (__arm__)
 157 # define HAVE_XATTR_SYSCALLS 1
 158 # define __NR_SYSCALL_BASE 0x900000
 159 # define __NR_lsetxattr         (__NR_SYSCALL_BASE+227)
 160 # define __NR_lgetxattr         (__NR_SYSCALL_BASE+230)
 161 # define __NR_llistxattr        (__NR_SYSCALL_BASE+233)
 162 #elif defined (__mips64__)
 163 # define HAVE_XATTR_SYSCALLS 1
 164 # define __NR_Linux 5000
 165 # define __NR_lsetxattr         (__NR_Linux + 218)
 166 # define __NR_lgetxattr         (__NR_Linux + 221)
 167 # define __NR_llistxattr        (__NR_Linux + 224)
 168 #elif defined (__mips__)
 169 # define HAVE_XATTR_SYSCALLS 1
 170 # define __NR_Linux 4000
 171 # define __NR_lsetxattr         (__NR_Linux + 225)
 172 # define __NR_lgetxattr         (__NR_Linux + 228)
 173 # define __NR_llistxattr        (__NR_Linux + 231)
 174 #elif defined (__alpha__)
 175 # define HAVE_XATTR_SYSCALLS 1
 176 # define __NR_lsetxattr         383
 177 # define __NR_lgetxattr         386
 178 # define __NR_llistxattr        389
 179 #elif defined (__mc68000__)
 180 # define HAVE_XATTR_SYSCALLS 1
 181 # define __NR_lsetxattr         224
 182 # define __NR_lgetxattr         227
 183 # define __NR_llistxattr        230
 184 #else
 185 # warning "Extended attribute syscalls undefined for this architecture"
 186 # define HAVE_XATTR_SYSCALLS 0
 187 #endif
 188
 189 #if HAVE_XATTR_SYSCALLS
 190 # define SYSCALL(args...)       syscall(args)
 191 #else
 192 # define SYSCALL(args...)       ( errno = ENOSYS, -1 )
 193 #endif
 194
 195 static int lsetxattr __P((const char *, const char *, void *, size_t, int));
 196 static ssize_t lgetxattr __P((const char *, const char *, void *, size_t));
 197 static ssize_t llistxattr __P((const char *, char *, size_t));
 198 static int xattr_cb_list __P((char *, char *, int, void *));
 199 static int xattr_cb_set __P((char *, char *, int, void *));
 200 static int xattr_cb_compare __P((char *, char *, int, void *));
 201 static int xattr_verify __P((char *));
 202 static int xattr_count __P((char *, int *));
 203 static int xattr_walk __P((char *, int (*)(char *, char *, int, void *), void *));
 204
 205 static int
 206 lsetxattr(const char *path, const char *name, void *value, size_t size, int flags)
 207 {
 208         return SYSCALL(__NR_lsetxattr, path, name, value, size, flags);
 209 }
 210
 211 static ssize_t
 212 lgetxattr(const char *path, const char *name, void *value, size_t size)
 213 {
 214         return SYSCALL(__NR_lgetxattr, path, name, value, size);
 215 }
 216
 217 static ssize_t
 218 llistxattr(const char *path, char *list, size_t size)
 219 {
 220         return SYSCALL(__NR_llistxattr, path, list, size);
 221 }
 222
 223 #define POSIX_ACL_XATTR_VERSION 0x0002
 224
 225 #define ACL_UNDEFINED_ID        (-1)
 226
 227 #define ACL_USER_OBJ            (0x01)
 228 #define ACL_USER                (0x02)
 229 #define ACL_GROUP_OBJ           (0x04)
 230 #define ACL_GROUP               (0x08)
 231 #define ACL_MASK                (0x10)
 232 #define ACL_OTHER               (0x20)
 233
 234 typedef struct {
 235         u_int16_t       e_tag;
 236         u_int16_t       e_perm;
 237         u_int32_t       e_id;
 238 } posix_acl_xattr_entry;
 239
 240 typedef struct {
 241         u_int32_t               a_version;
 242         posix_acl_xattr_entry   a_entries[0];
 243 } posix_acl_xattr_header;
 244
 245 static inline size_t
 246 posix_acl_xattr_size(int count)
 247 {
 248         return (sizeof(posix_acl_xattr_header) +
 249                 (count * sizeof(posix_acl_xattr_entry)));
 250 }
 251
 252 struct posix_acl_entry {
 253         short           e_tag;
 254         unsigned short  e_perm;
 255         unsigned int    e_id;
 256 };
 257
 258 struct posix_acl {
 259         unsigned int            a_count;
 260         struct posix_acl_entry  a_entries[0];
 261 };
 262
 263 #define EXT3_ACL_VERSION        0x0001
 264
 265 typedef struct {
 266         u_int16_t       e_tag;
 267         u_int16_t       e_perm;
 268         u_int32_t       e_id;
 269 } ext3_acl_entry;
 270
 271 typedef struct {
 272         u_int16_t       e_tag;
 273         u_int16_t       e_perm;
 274 } ext3_acl_entry_short;
 275
 276 typedef struct {
 277         u_int32_t       a_version;
 278 } ext3_acl_header;
 279
 280 static inline int ext3_acl_count(size_t size)
 281 {
 282         ssize_t s;
 283         size -= sizeof(ext3_acl_header);
 284         s = size - 4 * sizeof(ext3_acl_entry_short);
 285         if (s < 0) {
 286                 if (size % sizeof(ext3_acl_entry_short))
 287                         return -1;
 288                 return size / sizeof(ext3_acl_entry_short);
 289         } else {
 290                 if (s % sizeof(ext3_acl_entry))
 291                         return -1;
 292                 return s / sizeof(ext3_acl_entry) + 4;
 293         }
 294 }
 295
 296 int
 297 posix_acl_to_xattr(const struct posix_acl *acl, void *buffer, size_t size) {
 298         posix_acl_xattr_header *ext_acl = (posix_acl_xattr_header *)buffer;
 299         posix_acl_xattr_entry *ext_entry = ext_acl->a_entries;
 300         int real_size, n;
 301
 302         real_size = posix_acl_xattr_size(acl->a_count);
 303         if (!buffer)
 304                 return real_size;
 305         if (real_size > size) {
 306                 fprintf(stderr, "ACL: not enough space to convert (%d %d)\n", real_size, size);
 307                 return -1;
 308         }
 309
 310         ext_acl->a_version = POSIX_ACL_XATTR_VERSION;
 311         if (Bcvt)
 312                 swabst("1i", (u_char *)ext_acl);
 313
 314         for (n=0; n < acl->a_count; n++, ext_entry++) {
 315                 ext_entry->e_tag  = acl->a_entries[n].e_tag;
 316                 ext_entry->e_perm = acl->a_entries[n].e_perm;
 317                 ext_entry->e_id   = acl->a_entries[n].e_id;
 318                 if (Bcvt)
 319                         swabst("2s1i", (u_char *)ext_entry);
 320         }
 321         return real_size;
 322 }
 323
 324 static struct posix_acl *
 325 ext3_acl_from_disk(const void *value, size_t size)
 326 {
 327         const char *end = (char *)value + size;
 328         int n, count;
 329         struct posix_acl *acl;
 330
 331         if (!value)
 332                 return NULL;
 333         if (size < sizeof(ext3_acl_header)) {
 334                 fprintf(stderr, "ACL size too little\n");
 335                 return NULL;
 336         }
 337         if (Bcvt)
 338                 swabst("1i", (u_char *)value);
 339         if (((ext3_acl_header *)value)->a_version != EXT3_ACL_VERSION) {
 340                 fprintf(stderr, "ACL version unknown\n");
 341                 return NULL;
 342         }
 343         value = (char *)value + sizeof(ext3_acl_header);
 344         count = ext3_acl_count(size);
 345         if (count < 0) {
 346                 fprintf(stderr, "ACL bad count\n");
 347                 return NULL;
 348         }
 349         if (count == 0)
 350                 return NULL;
 351         acl = malloc(sizeof(struct posix_acl) + count * sizeof(struct posix_acl_entry));
 352         if (!acl) {
 353                 fprintf(stderr, "ACL malloc failed\n");
 354                 return NULL;
 355         }
 356         acl->a_count = count;
 357
 358         for (n=0; n < count; n++) {
 359                 if (Bcvt)
 360                         swabst("2s1i", (u_char *)value);
 361                 ext3_acl_entry *entry = (ext3_acl_entry *)value;
 362                 if ((char *)value + sizeof(ext3_acl_entry_short) > end)
 363                         goto fail;
 364                 acl->a_entries[n].e_tag  = entry->e_tag;
 365                 acl->a_entries[n].e_perm = entry->e_perm;
 366                 switch(acl->a_entries[n].e_tag) {
 367                 case ACL_USER_OBJ:
 368                 case ACL_GROUP_OBJ:
 369                 case ACL_MASK:
 370                 case ACL_OTHER:
 371                         value = (char *)value + sizeof(ext3_acl_entry_short);
 372                         acl->a_entries[n].e_id = ACL_UNDEFINED_ID;
 373                         break;
 374
 375                 case ACL_USER:
 376                 case ACL_GROUP:
 377                         value = (char *)value + sizeof(ext3_acl_entry);
 378                         if ((char *)value > end)
 379                                 goto fail;
 380                         acl->a_entries[n].e_id = entry->e_id;
 381                         break;
 382
 383                 default:
 384                         goto fail;
 385                 }
 386         }
 387         if (value != end)
 388                 goto fail;
 389         return acl;
 390
 391 fail:
 392         fprintf(stderr, "ACL bad entry\n");
 393         free(acl);
 394         return NULL;
 395 }
 396
 397 /*
 398  * Dump code starts here :)
 399  */
 400
 401 static int
 402 xattr_cb_list(char *name, char *value, int valuelen, void *private)
 403 {
 404         value[valuelen] = '\0';
 405         printf("EA: %s:%s\n", name, value);
 406
 407         return GOOD;
 408 }
 409
 410 static int
 411 xattr_cb_set(char *name, char *value, int valuelen, void *private)
 412 {
 413         char *path = (char *)private;
 414
 415         if (lsetxattr(path, name, value, valuelen, 0) < 0) {
 416                 warn("lsetxattr %s failed", path);
 417                 return FAIL;
 418         }
 419         return GOOD;
 420 }
 421
 422 static int
 423 xattr_cb_compare(char *name, char *value, int valuelen, void *private)
 424 {
 425         char *path = (char *)private;
 426         char valuef[XATTR_MAXSIZE];
 427         int valuesz;
 428
 429         valuesz = lgetxattr(path, name, valuef, XATTR_MAXSIZE);
 430         if (valuesz < 0) {
 431                 warn("%s: lgetxattr failed\n", path);
 432                 return FAIL;
 433         }
 434
 435         if (valuesz != valuelen) {
 436                 fprintf(stderr, "%s: EA %s value changed\n", path, value);
 437                 return FAIL;
 438         }
 439
 440         if (memcmp(value, valuef, valuelen)) {
 441                 fprintf(stderr, "%s: EA %s value changed\n", path, value);
 442                 return FAIL;
 443         }
 444
 445         return GOOD;
 446 }
 447
 448 static int
 449 xattr_verify(char *buffer)
 450 {
 451         struct ext2_xattr_entry *entry;
 452         char *end;
 453
 454         end = buffer + XATTR_MAXSIZE;
 455
 456         if (Bcvt)
 457                 swabst("4i", (u_char *)buffer);
 458
 459         if (HDR(buffer)->h_magic != EXT2_XATTR_MAGIC &&
 460             HDR(buffer)->h_magic != EXT2_XATTR_MAGIC2) {
 461                 fprintf(stderr, "error in EA block 1\n");
 462                 fprintf(stderr, "magic = %x\n", HDR(buffer)->h_magic);
 463
 464                 return FAIL;
 465         }
 466
 467         /* check the on-disk data structure */
 468         entry = FIRST_ENTRY(buffer);
 469         if (Bcvt)
 470                 swabst("2b1s3i", (u_char *)entry);
 471         while (!IS_LAST_ENTRY(entry)) {
 472                 struct ext2_xattr_entry *next = EXT2_XATTR_NEXT(entry);
 473
 474                 if ((char *)next >= end) {
 475                         fprintf(stderr, "error in EA block\n");
 476                         return FAIL;
 477                 }
 478                 entry = next;
 479                 if (Bcvt)
 480                         swabst("2b1s3i", (u_char *)entry);
 481         }
 482         return GOOD;
 483 }
 484
 485 static int
 486 xattr_count(char *buffer, int *count)
 487 {
 488         struct ext2_xattr_entry *entry;
 489         int result = 0;
 490
 491         /* list the attribute names */
 492         for (entry = FIRST_ENTRY(buffer); !IS_LAST_ENTRY(entry);
 493              entry = EXT2_XATTR_NEXT(entry))
 494                 result++;
 495
 496         *count = result;
 497         return GOOD;
 498 }
 499
 500 static int
 501 xattr_walk(char *buffer, int (*xattr_cb)(char *, char *, int, void *), void *private)
 502 {
 503         struct ext2_xattr_entry *entry;
 504
 505         /* list the attribute names */
 506         for (entry = FIRST_ENTRY(buffer); !IS_LAST_ENTRY(entry);
 507              entry = EXT2_XATTR_NEXT(entry)) {
 508                 char name[XATTR_MAXSIZE], value[XATTR_MAXSIZE];
 509                 int off;
 510                 int convertacl = 0;
 511
 512                 switch (entry->e_name_index) {
 513                 case EXT2_XATTR_INDEX_USER:
 514                         strcpy(name, "user.");
 515                         break;
 516                 case EXT2_XATTR_INDEX_POSIX_ACL_ACCESS:
 517                         strcpy(name, "system.posix_acl_access");
 518                         convertacl = 1;
 519                         break;
 520                 case EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT:
 521                         strcpy(name, "system.posix_acl_default");
 522                         convertacl = 1;
 523                         break;
 524                 case EXT2_XATTR_INDEX_TRUSTED:
 525                         strcpy(name, "trusted.");
 526                         break;
 527                 case EXT2_XATTR_INDEX_LUSTRE:
 528                         strcpy(name, "lustre.");
 529                         break;
 530                 case EXT2_XATTR_INDEX_SECURITY:
 531                         strcpy(name, "security.");
 532                         break;
 533                 default:
 534                         fprintf(stderr, "Unknown EA index\n");
 535                         return FAIL;
 536                 }
 537
 538                 off = strlen(name);
 539                 memcpy(name + off, entry->e_name, entry->e_name_len);
 540                 name[off + entry->e_name_len] = '\0';
 541
 542                 memcpy(value, buffer + VALUE_OFFSET(buffer, entry), entry->e_value_size);
 543
 544                 if (convertacl) {
 545                         struct posix_acl *acl;
 546                         int size;
 547
 548                         acl = ext3_acl_from_disk(value, entry->e_value_size);
 549                         if (!acl)
 550                                 return FAIL;
 551                         size = posix_acl_to_xattr(acl, value, XATTR_MAXSIZE);
 552                         if (size < 0)
 553                                 return FAIL;
 554                         entry->e_value_size = size;
 555                         free(acl);
 556                 }
 557
 558                 if (xattr_cb(name, value, entry->e_value_size, private) != GOOD)
 559                         return FAIL;
 560         }
 561
 562         return GOOD;
 563 }
 564
 565 int
 566 xattr_compare(char *path, char *buffer)
 567 {
 568         int countf, countt;
 569         char *names = NULL, *end_names, *name;
 570
 571         countf = llistxattr(path, NULL, 0);
 572         if (countf < 0) {
 573                 warn("%s: llistxattr failed", path);
 574                 return FAIL;
 575         }
 576
 577         names = malloc(countf + 1);
 578         if (!names) {
 579                 warn("%s: llistxattr failed", path);
 580                 return FAIL;
 581         }
 582
 583         countf = llistxattr(path, names, countf);
 584         if (countf < 0) {
 585                 warn("%s: llistxattr failed", path);
 586                 free(names);
 587                 return FAIL;
 588         }
 589
 590         names[countf] = '\0';
 591         end_names = names + countf;
 592
 593         countf = 0;
 594         for (name = names; name != end_names; name = strchr(name, '\0') + 1) {
 595                 if (!*name)
 596                         continue;
 597                 countf++;
 598         }
 599
 600         free(names);
 601
 602         if (buffer) {
 603                 if (xattr_verify(buffer) == FAIL)
 604                         return FAIL;
 605
 606                 if (xattr_count(buffer, &countt) == FAIL)
 607                         return FAIL;
 608         }
 609         else
 610                 countt = 0;
 611
 612         if (countf != countt) {
 613                 fprintf(stderr, "%s: EA count changed from %d to %d\n", path, countt, countf);
 614                 return FAIL;
 615         }
 616
 617         if (!buffer)
 618                 return GOOD;
 619
 620         return xattr_walk(buffer, xattr_cb_compare, path);
 621 }
 622
 623 int
 624 xattr_extract(char *path, char *buffer)
 625 {
 626         if (dflag) {
 627                 fprintf(stderr, "xattr_extract(%s)\n", path);
 628                 xattr_walk(buffer, xattr_cb_list, NULL);
 629         }
 630
 631         if (xattr_verify(buffer) == FAIL)
 632                 return FAIL;
 633
 634         return xattr_walk(buffer, xattr_cb_set, path);
 635 }
 636