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 1.6 2010/03/08 10:40:52 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 #ifdef TRANSSELINUX                     /*GAN6May06 SELinux MLS */
  47 # include <selinux/selinux.h>
  48 #endif
  49 #include "restore.h"
  50 #include "extern.h"
  51 #include "pathnames.h"
  52
  53 /*
  54  * Data structures below taken from the kernel
  55  */
  56
  57 /* Maximum number of references to one attribute block */
  58 #define EXT2_XATTR_REFCOUNT_MAX         1024
  59
  60 /* Name indexes */
  61 #define EXT2_XATTR_INDEX_MAX                    10
  62 #define EXT2_XATTR_INDEX_USER                   1
  63 #define EXT2_XATTR_INDEX_POSIX_ACL_ACCESS       2
  64 #define EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT      3
  65 #define EXT2_XATTR_INDEX_TRUSTED                4
  66 #define EXT2_XATTR_INDEX_LUSTRE                 5
  67 #define EXT2_XATTR_INDEX_SECURITY               6
  68
  69 struct ext2_xattr_header {
  70         u_int32_t       h_magic;        /* magic number for identification */
  71         u_int32_t       h_refcount;     /* reference count */
  72         u_int32_t       h_blocks;       /* number of disk blocks used */
  73         u_int32_t       h_hash;         /* hash value of all attributes */
  74         u_int32_t       h_reserved[4];  /* zero right now */
  75 };
  76
  77 struct ext3_xattr_ibody_header {
  78         u_int32_t       h_magic;        /* magic number for identification */
  79 };
  80
  81 struct ext2_xattr_entry {
  82         u_char          e_name_len;     /* length of name */
  83         u_char          e_name_index;   /* attribute name index */
  84         u_int16_t       e_value_offs;   /* offset in disk block of value */
  85         u_int32_t       e_value_block;  /* disk block attribute is stored on (n/i) */
  86         u_int32_t       e_value_size;   /* size of attribute value */
  87         u_int32_t       e_hash;         /* hash value of name and value */
  88         char            e_name[0];      /* attribute name */
  89 };
  90
  91 #define EXT2_XATTR_PAD_BITS             2
  92 #define EXT2_XATTR_PAD          (1<<EXT2_XATTR_PAD_BITS)
  93 #define EXT2_XATTR_ROUND                (EXT2_XATTR_PAD-1)
  94 #define EXT2_XATTR_LEN(name_len) \
  95         (((name_len) + EXT2_XATTR_ROUND + \
  96         sizeof(struct ext2_xattr_entry)) & ~EXT2_XATTR_ROUND)
  97 #define EXT2_XATTR_NEXT(entry) \
  98         ( (struct ext2_xattr_entry *)( \
  99           (char *)(entry) + EXT2_XATTR_LEN((entry)->e_name_len)) )
 100 #define EXT3_XATTR_SIZE(size) \
 101         (((size) + EXT2_XATTR_ROUND) & ~EXT2_XATTR_ROUND)
 102
 103 #define HDR(buffer) ((struct ext2_xattr_header *)(buffer))
 104 #define ENTRY(ptr) ((struct ext2_xattr_entry *)(ptr))
 105 #define IS_LAST_ENTRY(entry) (*(__u32 *)(entry) == 0)
 106
 107 #define BFIRST(buffer) ENTRY(HDR(buffer)+1)
 108 #define IFIRST(buffer) ENTRY(((struct ext3_xattr_ibody_header *)(buffer))+1)
 109
 110 #define FIRST_ENTRY(buffer) \
 111         ((HDR(buffer)->h_magic == EXT2_XATTR_MAGIC2) ? \
 112                 IFIRST(buffer) : \
 113                 BFIRST(buffer))
 114
 115 /*
 116  * On-block xattr value offsets start at the beginning of the block, but
 117  * on-inode xattr value offsets start after the initial header
 118  * (ext3_xattr_ibody_header).
 119  */
 120 #define VALUE_OFFSET(buffer, entry) \
 121         (((HDR(buffer)->h_magic == EXT2_XATTR_MAGIC2) ? \
 122                 (entry)->e_value_offs + sizeof(struct ext3_xattr_ibody_header) : \
 123                 (entry)->e_value_offs))
 124
 125 /*
 126  * xattr syscalls do not exist yet in libc, get our own copy here,
 127  * taken from libattr.
 128  */
 129 #if defined (__i386__)
 130 # define HAVE_XATTR_SYSCALLS 1
 131 # define __NR_lsetxattr         227
 132 # define __NR_lgetxattr         230
 133 # define __NR_llistxattr        233
 134 #elif defined (__sparc__)
 135 # define HAVE_XATTR_SYSCALLS 1
 136 # define __NR_lsetxattr         170
 137 # define __NR_lgetxattr         173
 138 # define __NR_llistxattr        179
 139 #elif defined (__ia64__)
 140 # define HAVE_XATTR_SYSCALLS 1
 141 # define __NR_lsetxattr         1218
 142 # define __NR_lgetxattr         1221
 143 # define __NR_llistxattr        1224
 144 #elif defined (__powerpc__)
 145 # define HAVE_XATTR_SYSCALLS 1
 146 # define __NR_lsetxattr         210
 147 # define __NR_lgetxattr         213
 148 # define __NR_llistxattr        216
 149 #elif defined (__x86_64__)
 150 # define HAVE_XATTR_SYSCALLS 1
 151 # define __NR_lsetxattr         189
 152 # define __NR_lgetxattr         192
 153 # define __NR_llistxattr        195
 154 #elif defined (__s390__)
 155 # define HAVE_XATTR_SYSCALLS 1
 156 # define __NR_lsetxattr         225
 157 # define __NR_lgetxattr         228
 158 # define __NR_llistxattr        231
 159 #elif defined (__arm__)
 160 # define HAVE_XATTR_SYSCALLS 1
 161 # define __NR_SYSCALL_BASE 0x900000
 162 # define __NR_lsetxattr         (__NR_SYSCALL_BASE+227)
 163 # define __NR_lgetxattr         (__NR_SYSCALL_BASE+230)
 164 # define __NR_llistxattr        (__NR_SYSCALL_BASE+233)
 165 #elif defined (__mips64__)
 166 # define HAVE_XATTR_SYSCALLS 1
 167 # define __NR_Linux 5000
 168 # define __NR_lsetxattr         (__NR_Linux + 218)
 169 # define __NR_lgetxattr         (__NR_Linux + 221)
 170 # define __NR_llistxattr        (__NR_Linux + 224)
 171 #elif defined (__mips__)
 172 # define HAVE_XATTR_SYSCALLS 1
 173 # define __NR_Linux 4000
 174 # define __NR_lsetxattr         (__NR_Linux + 225)
 175 # define __NR_lgetxattr         (__NR_Linux + 228)
 176 # define __NR_llistxattr        (__NR_Linux + 231)
 177 #elif defined (__alpha__)
 178 # define HAVE_XATTR_SYSCALLS 1
 179 # define __NR_lsetxattr         383
 180 # define __NR_lgetxattr         386
 181 # define __NR_llistxattr        389
 182 #elif defined (__mc68000__)
 183 # define HAVE_XATTR_SYSCALLS 1
 184 # define __NR_lsetxattr         224
 185 # define __NR_lgetxattr         227
 186 # define __NR_llistxattr        230
 187 #else
 188 # warning "Extended attribute syscalls undefined for this architecture"
 189 # define HAVE_XATTR_SYSCALLS 0
 190 #endif
 191
 192 #if HAVE_XATTR_SYSCALLS
 193 # define SYSCALL(args...)       syscall(args)
 194 #else
 195 # define SYSCALL(args...)       ( errno = ENOSYS, -1 )
 196 #endif
 197
 198 static int lsetxattr __P((const char *, const char *, void *, size_t, int));
 199 static ssize_t lgetxattr __P((const char *, const char *, void *, size_t));
 200 static ssize_t llistxattr __P((const char *, char *, size_t));
 201 static int xattr_cb_list __P((char *, char *, int, int, void *));
 202 static int xattr_cb_set __P((char *, char *, int, int, void *));
 203 static int xattr_cb_compare __P((char *, char *, int, int, void *));
 204 static int xattr_verify __P((char *));
 205 static int xattr_count __P((char *, int *));
 206 static int xattr_walk __P((char *, int (*)(char *, char *, int, int, void *), void *));
 207
 208 static int
 209 lsetxattr(const char *path, const char *name, void *value, size_t size, int flags)
 210 {
 211         return SYSCALL(__NR_lsetxattr, path, name, value, size, flags);
 212 }
 213
 214 static ssize_t
 215 lgetxattr(const char *path, const char *name, void *value, size_t size)
 216 {
 217         return SYSCALL(__NR_lgetxattr, path, name, value, size);
 218 }
 219
 220 static ssize_t
 221 llistxattr(const char *path, char *list, size_t size)
 222 {
 223         return SYSCALL(__NR_llistxattr, path, list, size);
 224 }
 225
 226 #define POSIX_ACL_XATTR_VERSION 0x0002
 227
 228 #define ACL_UNDEFINED_ID        (-1)
 229
 230 #define ACL_USER_OBJ            (0x01)
 231 #define ACL_USER                (0x02)
 232 #define ACL_GROUP_OBJ           (0x04)
 233 #define ACL_GROUP               (0x08)
 234 #define ACL_MASK                (0x10)
 235 #define ACL_OTHER               (0x20)
 236
 237 typedef struct {
 238         u_int16_t       e_tag;
 239         u_int16_t       e_perm;
 240         u_int32_t       e_id;
 241 } posix_acl_xattr_entry;
 242
 243 typedef struct {
 244         u_int32_t               a_version;
 245         posix_acl_xattr_entry   a_entries[0];
 246 } posix_acl_xattr_header;
 247
 248 static inline size_t
 249 posix_acl_xattr_size(int count)
 250 {
 251         return (sizeof(posix_acl_xattr_header) +
 252                 (count * sizeof(posix_acl_xattr_entry)));
 253 }
 254
 255 struct posix_acl_entry {
 256         short           e_tag;
 257         unsigned short  e_perm;
 258         unsigned int    e_id;
 259 };
 260
 261 struct posix_acl {
 262         unsigned int            a_count;
 263         struct posix_acl_entry  a_entries[0];
 264 };
 265
 266 #define EXT3_ACL_VERSION        0x0001
 267
 268 typedef struct {
 269         u_int16_t       e_tag;
 270         u_int16_t       e_perm;
 271         u_int32_t       e_id;
 272 } ext3_acl_entry;
 273
 274 typedef struct {
 275         u_int16_t       e_tag;
 276         u_int16_t       e_perm;
 277 } ext3_acl_entry_short;
 278
 279 typedef struct {
 280         u_int32_t       a_version;
 281 } ext3_acl_header;
 282
 283 static inline int ext3_acl_count(size_t size)
 284 {
 285         ssize_t s;
 286         size -= sizeof(ext3_acl_header);
 287         s = size - 4 * sizeof(ext3_acl_entry_short);
 288         if (s < 0) {
 289                 if (size % sizeof(ext3_acl_entry_short))
 290                         return -1;
 291                 return size / sizeof(ext3_acl_entry_short);
 292         } else {
 293                 if (s % sizeof(ext3_acl_entry))
 294                         return -1;
 295                 return s / sizeof(ext3_acl_entry) + 4;
 296         }
 297 }
 298
 299 int
 300 posix_acl_to_xattr(const struct posix_acl *acl, void *buffer, size_t size) {
 301         posix_acl_xattr_header *ext_acl = (posix_acl_xattr_header *)buffer;
 302         posix_acl_xattr_entry *ext_entry = ext_acl->a_entries;
 303         int real_size, n;
 304
 305         real_size = posix_acl_xattr_size(acl->a_count);
 306         if (!buffer)
 307                 return real_size;
 308         if (real_size > size) {
 309                 fprintf(stderr, "ACL: not enough space to convert (%d %d)\n", real_size, size);
 310                 return -1;
 311         }
 312
 313         ext_acl->a_version = POSIX_ACL_XATTR_VERSION;
 314 #if BYTE_ORDER == BIG_ENDIAN
 315         swabst("1i", (u_char *)ext_acl);
 316 #endif
 317
 318         for (n=0; n < acl->a_count; n++, ext_entry++) {
 319                 ext_entry->e_tag  = acl->a_entries[n].e_tag;
 320                 ext_entry->e_perm = acl->a_entries[n].e_perm;
 321                 ext_entry->e_id   = acl->a_entries[n].e_id;
 322 #if BYTE_ORDER == BIG_ENDIAN
 323                 swabst("2s1i", (u_char *)ext_entry);
 324 #endif
 325         }
 326         return real_size;
 327 }
 328
 329 static struct posix_acl *
 330 ext3_acl_from_disk(const void *value, size_t size)
 331 {
 332         const char *end = (char *)value + size;
 333         int n, count;
 334         struct posix_acl *acl;
 335
 336         if (!value)
 337                 return NULL;
 338         if (size < sizeof(ext3_acl_header)) {
 339                 fprintf(stderr, "ACL size too little\n");
 340                 return NULL;
 341         }
 342 #if BYTE_ORDER == BIG_ENDIAN
 343         swabst("1i", (u_char *)value);
 344 #endif
 345         if (((ext3_acl_header *)value)->a_version != EXT3_ACL_VERSION) {
 346                 fprintf(stderr, "ACL version unknown\n");
 347                 return NULL;
 348         }
 349         value = (char *)value + sizeof(ext3_acl_header);
 350         count = ext3_acl_count(size);
 351         if (count < 0) {
 352                 fprintf(stderr, "ACL bad count\n");
 353                 return NULL;
 354         }
 355         if (count == 0)
 356                 return NULL;
 357         acl = malloc(sizeof(struct posix_acl) + count * sizeof(struct posix_acl_entry));
 358         if (!acl) {
 359                 fprintf(stderr, "ACL malloc failed\n");
 360                 return NULL;
 361         }
 362         acl->a_count = count;
 363
 364         for (n=0; n < count; n++) {
 365                 ext3_acl_entry *entry = (ext3_acl_entry *)value;
 366 #if BYTE_ORDER == BIG_ENDIAN
 367                 swabst("2s", (u_char *)entry);
 368 #endif
 369                 if ((char *)value + sizeof(ext3_acl_entry_short) > end)
 370                         goto fail;
 371                 acl->a_entries[n].e_tag  = entry->e_tag;
 372                 acl->a_entries[n].e_perm = entry->e_perm;
 373                 switch(acl->a_entries[n].e_tag) {
 374                 case ACL_USER_OBJ:
 375                 case ACL_GROUP_OBJ:
 376                 case ACL_MASK:
 377                 case ACL_OTHER:
 378                         value = (char *)value + sizeof(ext3_acl_entry_short);
 379                         acl->a_entries[n].e_id = ACL_UNDEFINED_ID;
 380                         break;
 381
 382                 case ACL_USER:
 383                 case ACL_GROUP:
 384 #if BYTE_ORDER == BIG_ENDIAN
 385                         swabst("4b1i", (u_char *)entry);
 386 #endif
 387                         value = (char *)value + sizeof(ext3_acl_entry);
 388                         if ((char *)value > end)
 389                                 goto fail;
 390                         acl->a_entries[n].e_id = entry->e_id;
 391                         break;
 392
 393                 default:
 394                         goto fail;
 395                 }
 396         }
 397         if (value != end)
 398                 goto fail;
 399         return acl;
 400
 401 fail:
 402         fprintf(stderr, "ACL bad entry\n");
 403         free(acl);
 404         return NULL;
 405 }
 406
 407 /*
 408  * Dump code starts here :)
 409  */
 410
 411 static int
 412 xattr_cb_list(char *name, char *value, int valuelen, int isSELinux, void *private)
 413 {
 414         isSELinux;
 415         value[valuelen] = '\0';
 416         printf("EA: %s:%s\n", name, value);
 417
 418         return GOOD;
 419 }
 420
 421 static int
 422 xattr_cb_set(char *name, char *value, int valuelen, int isSELinux, void *private)
 423 {
 424         char *path = (char *)private;
 425         int err;
 426
 427         if (Nflag)
 428                 return GOOD;
 429
 430         isSELinux;
 431 #ifdef TRANSSELINUX                     /*GAN6May06 SELinux MLS */
 432         if (isSELinux)
 433                 err = lsetfilecon(path, value);
 434         else
 435 #endif
 436                 err = lsetxattr(path, name, value, valuelen, 0);
 437
 438         if (err) {
 439                 warn("%s: EA set %s:%s failed", path, name, value);
 440                 return FAIL;
 441         }
 442
 443         return GOOD;
 444 }
 445
 446 static int
 447 xattr_cb_compare(char *name, char *value, int valuelen, int isSELinux, void *private)
 448 {
 449         char *path = (char *)private;
 450         char valuef[XATTR_MAXSIZE];
 451         int valuesz;
 452
 453         isSELinux;
 454 #ifdef TRANSSELINUX                     /*GAN6May06 SELinux MLS */
 455         if (isSELinux)
 456         {
 457                 security_context_t con = NULL;
 458
 459                 if (lgetfilecon(path, &con) < 0) {
 460                         warn("%s: EA compare lgetfilecon failed\n", path);
 461                         return FAIL;
 462                 }
 463
 464                 valuesz = strlen(con) + 1;
 465                 valuef[0] = 0;
 466                 strncat(valuef, con, sizeof valuef);
 467                 freecon(con);
 468         }
 469         else {
 470 #endif
 471                 valuesz = lgetxattr(path, name, valuef, XATTR_MAXSIZE);
 472                 if (valuesz < 0) {
 473                         warn("%s: EA compare lgetxattr failed\n", path);
 474                         return FAIL;
 475                 }
 476 #ifdef TRANSSELINUX                     /*GAN6May06 SELinux MLS */
 477         }
 478 #endif
 479
 480         if (valuesz != valuelen || memcmp(value, valuef, valuelen)) {
 481                 /* GAN24May06: show name and new value for user to compare */
 482                 fprintf(stderr, "%s: EA %s:%s value changed to %s\n", path, name, value, valuef);
 483                 return FAIL;
 484         }
 485
 486         return GOOD;
 487 }
 488
 489 static int
 490 xattr_verify(char *buffer)
 491 {
 492         struct ext2_xattr_entry *entry;
 493         char *end;
 494
 495         end = buffer + XATTR_MAXSIZE;
 496
 497 #if BYTE_ORDER == BIG_ENDIAN
 498         swabst("4i", (u_char *)buffer);
 499 #endif
 500
 501         if (HDR(buffer)->h_magic != EXT2_XATTR_MAGIC &&
 502             HDR(buffer)->h_magic != EXT2_XATTR_MAGIC2) {
 503                 fprintf(stderr, "error in EA block 1\n");
 504                 fprintf(stderr, "magic = %x\n", HDR(buffer)->h_magic);
 505
 506                 return FAIL;
 507         }
 508
 509         /* check the on-disk data structure */
 510         entry = FIRST_ENTRY(buffer);
 511 #if BYTE_ORDER == BIG_ENDIAN
 512         swabst("2b1s3i", (u_char *)entry);
 513 #endif
 514         while (!IS_LAST_ENTRY(entry)) {
 515                 struct ext2_xattr_entry *next = EXT2_XATTR_NEXT(entry);
 516
 517                 if ((char *)next >= end) {
 518                         fprintf(stderr, "error in EA block\n");
 519                         return FAIL;
 520                 }
 521                 entry = next;
 522 #if BYTE_ORDER == BIG_ENDIAN
 523                 swabst("2b1s3i", (u_char *)entry);
 524 #endif
 525         }
 526         return GOOD;
 527 }
 528
 529 static int
 530 xattr_count(char *buffer, int *count)
 531 {
 532         struct ext2_xattr_entry *entry;
 533         int result = 0;
 534
 535         /* list the attribute names */
 536         for (entry = FIRST_ENTRY(buffer); !IS_LAST_ENTRY(entry);
 537              entry = EXT2_XATTR_NEXT(entry))
 538                 result++;
 539
 540         *count = result;
 541         return GOOD;
 542 }
 543
 544 static int
 545 xattr_walk(char *buffer, int (*xattr_cb)(char *, char *, int, int, void *), void *private)
 546 {
 547         struct ext2_xattr_entry *entry;
 548
 549         /* list the attribute names */
 550         for (entry = FIRST_ENTRY(buffer); !IS_LAST_ENTRY(entry);
 551              entry = EXT2_XATTR_NEXT(entry)) {
 552                 char name[XATTR_MAXSIZE], value[XATTR_MAXSIZE];
 553                 int size;
 554                 int off;
 555                 int convertacl = 0;
 556                 int convertcon = 0;
 557
 558                 switch (entry->e_name_index) {
 559                 case EXT2_XATTR_INDEX_USER:
 560                         strcpy(name, "user.");
 561                         break;
 562                 case EXT2_XATTR_INDEX_POSIX_ACL_ACCESS:
 563                         strcpy(name, "system.posix_acl_access");
 564                         convertacl = 1;
 565                         break;
 566                 case EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT:
 567                         strcpy(name, "system.posix_acl_default");
 568                         convertacl = 1;
 569                         break;
 570                 case EXT2_XATTR_INDEX_TRUSTED:
 571                         strcpy(name, "trusted.");
 572                         break;
 573                 case EXT2_XATTR_INDEX_LUSTRE:
 574                         strcpy(name, "lustre.");
 575                         break;
 576                 case EXT2_XATTR_INDEX_SECURITY:
 577                         strcpy(name, "security.");
 578 #ifdef TRANSSELINUX                     /*GAN6May06 SELinux MLS */
 579                         convertcon = transselinuxflag;
 580 #endif
 581                         break;
 582                 default:
 583                         fprintf(stderr, "Unknown EA index\n");
 584                         return FAIL;
 585                 }
 586
 587                 off = strlen(name);
 588                 memcpy(name + off, entry->e_name, entry->e_name_len);
 589                 name[off + entry->e_name_len] = '\0';
 590                 size = entry->e_value_size;
 591
 592                 memcpy(value, buffer + VALUE_OFFSET(buffer, entry), size);
 593
 594                 if (convertacl) {
 595                         struct posix_acl *acl;
 596
 597                         acl = ext3_acl_from_disk(value, size);
 598                         if (!acl)
 599                                 return FAIL;
 600                         size = posix_acl_to_xattr(acl, value, XATTR_MAXSIZE);
 601                         if (size < 0)
 602                                 return FAIL;
 603                         free(acl);
 604                 }
 605
 606 #ifdef TRANSSELINUX                     /*GAN6May06 SELinux MLS */
 607                 if (convertcon  &&  strcmp(name, "security.selinux"))
 608                         convertcon = 0; /*GAN24May06 only for selinux */
 609
 610                 if (convertcon)
 611                 {
 612                         security_context_t con = NULL;
 613                         int err;
 614
 615                         if (!transselinuxarg)
 616                                 err = security_canonicalize_context(value, &con);
 617                         else {
 618                                 strncat(value, transselinuxarg, sizeof value);
 619                                 err = security_canonicalize_context_raw(value, &con);
 620                         }
 621
 622                         if (err < 0) {
 623                                 warn("%s: EA canonicalize failed\n", value);
 624                                 return FAIL;
 625                         }
 626
 627                         size = strlen(con) + 1;
 628                         value[0] = 0;
 629                         strncat(value, con, sizeof value);
 630                         freecon(con);
 631                 }
 632 #endif
 633
 634                 if (xattr_cb(name, value, size, convertcon, private) != GOOD)
 635                         return FAIL;
 636         }
 637
 638         return GOOD;
 639 }
 640
 641 int
 642 xattr_compare(char *path, char *buffer)
 643 {
 644         int countf, countt;
 645         char *names = NULL, *end_names, *name;
 646
 647         countf = llistxattr(path, NULL, 0);
 648         if (countf < 0) {
 649                 warn("%s: llistxattr failed", path);
 650                 return FAIL;
 651         }
 652
 653         names = malloc(countf + 1);
 654         if (!names) {
 655                 warn("%s: llistxattr failed", path);
 656                 return FAIL;
 657         }
 658
 659         countf = llistxattr(path, names, countf);
 660         if (countf < 0) {
 661                 warn("%s: llistxattr failed", path);
 662                 free(names);
 663                 return FAIL;
 664         }
 665
 666         names[countf] = '\0';
 667         end_names = names + countf;
 668
 669         countf = 0;
 670         for (name = names; name != end_names; name = strchr(name, '\0') + 1) {
 671                 if (!*name)
 672                         continue;
 673                 countf++;
 674         }
 675
 676         free(names);
 677
 678         if (buffer) {
 679                 if (xattr_verify(buffer) == FAIL)
 680                         return FAIL;
 681
 682                 if (xattr_count(buffer, &countt) == FAIL)
 683                         return FAIL;
 684         }
 685         else
 686                 countt = 0;
 687
 688         if (countf != countt) {
 689                 fprintf(stderr, "%s: EA count changed from %d to %d\n", path, countt, countf);
 690                 return FAIL;
 691         }
 692
 693         if (!buffer)
 694                 return GOOD;
 695
 696         return xattr_walk(buffer, xattr_cb_compare, path);
 697 }
 698
 699 int
 700 xattr_extract(char *path, char *buffer)
 701 {
 702         if (dflag) {
 703                 fprintf(stderr, "xattr_extract(%s)\n", path);
 704                 xattr_walk(buffer, xattr_cb_list, NULL);
 705         }
 706
 707         if (xattr_verify(buffer) == FAIL)
 708                 return FAIL;
 709
 710         return xattr_walk(buffer, xattr_cb_set, path);
 711 }
 712