source3/modules/vfs_shadow_copy2.c

   1 /*
   2  * Third attempt at a shadow copy module
   3  *
   4  * Copyright (C) Andrew Tridgell   2007 (portions taken from shadow_copy2)
   5  * Copyright (C) Ed Plese          2009
   6  * Copyright (C) Volker Lendecke   2011
   7  * Copyright (C) Christian Ambach  2011
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 /*
  25
  26   This is a 3rd implemetation of a shadow copy module for exposing
  27   snapshots to windows clients as shadow copies. This version has the
  28   following features:
  29
  30      1) you don't need to populate your shares with symlinks to the
  31      snapshots. This can be very important when you have thousands of
  32      shares, or use [homes]
  33
  34      2) the inode number of the files is altered so it is different
  35      from the original. This allows the 'restore' button to work
  36      without a sharing violation
  37
  38      3) shadow copy results can be sorted before being sent to the
  39      client.  This is beneficial for filesystems that don't read
  40      directories alphabetically (the default unix).
  41
  42      4) vanity naming for snapshots. Snapshots can be named in any
  43      format compatible with str[fp]time conversions.
  44
  45      5) time stamps in snapshot names can be represented in localtime
  46      rather than UTC.
  47
  48   Module options:
  49
  50       shadow:snapdir = <directory where snapshots are kept>
  51
  52       This is the directory containing the @GMT-* snapshot directories. If it is an absolute
  53       path it is used as-is. If it is a relative path, then it is taken relative to the mount
  54       point of the filesystem that the root of this share is on
  55
  56       shadow:basedir = <base directory that snapshots are from>
  57
  58       This is an optional parameter that specifies the directory that
  59       the snapshots are relative to. It defaults to the filesystem
  60       mount point
  61
  62       shadow:fixinodes = yes/no
  63
  64       If you enable shadow:fixinodes then this module will modify the
  65       apparent inode number of files in the snapshot directories using
  66       a hash of the files path. This is needed for snapshot systems
  67       where the snapshots have the same device:inode number as the
  68       original files (such as happens with GPFS snapshots). If you
  69       don't set this option then the 'restore' button in the shadow
  70       copy UI will fail with a sharing violation.
  71
  72       shadow:sort = asc/desc, or not specified for unsorted (default)
  73
  74       This is an optional parameter that specifies that the shadow
  75       copy directories should be sorted before sending them to the
  76       client.  This can be beneficial as unix filesystems are usually
  77       not listed alphabetically sorted.  If enabled, you typically
  78       want to specify descending order.
  79
  80       shadow:format = <format specification for snapshot names>
  81
  82       This is an optional parameter that specifies the format
  83       specification for the naming of snapshots.  The format must
  84       be compatible with the conversion specifications recognized
  85       by str[fp]time.  The default value is "@GMT-%Y.%m.%d-%H.%M.%S".
  86
  87       shadow:sscanf = yes/no (default is no)
  88
  89       The time is the unsigned long integer (%lu) in the format string
  90       rather than a time strptime() can parse.  The result must be a unix time_t
  91       time.
  92
  93       shadow:localtime = yes/no (default is no)
  94
  95       This is an optional parameter that indicates whether the
  96       snapshot names are in UTC/GMT or the local time.
  97
  98
  99   The following command would generate a correctly formatted directory name
 100   for use with the default parameters:
 101      date -u +@GMT-%Y.%m.%d-%H.%M.%S
 102  */
 103
 104 #include "includes.h"
 105 #include "system/filesys.h"
 106 #include "include/ntioctl.h"
 107 #include <ccan/hash/hash.h>
 108 #include "util_tdb.h"
 109
 110 static bool shadow_copy2_find_slashes(TALLOC_CTX *mem_ctx, const char *str,
 111                                       size_t **poffsets,
 112                                       unsigned *pnum_offsets)
 113 {
 114         unsigned num_offsets;
 115         size_t *offsets;
 116         const char *p;
 117
 118         num_offsets = 0;
 119
 120         p = str;
 121         while ((p = strchr(p, '/')) != NULL) {
 122                 num_offsets += 1;
 123                 p += 1;
 124         }
 125
 126         offsets = talloc_array(mem_ctx, size_t, num_offsets);
 127         if (offsets == NULL) {
 128                 return false;
 129         }
 130
 131         p = str;
 132         num_offsets = 0;
 133         while ((p = strchr(p, '/')) != NULL) {
 134                 offsets[num_offsets] = p-str;
 135                 num_offsets += 1;
 136                 p += 1;
 137         }
 138
 139         *poffsets = offsets;
 140         *pnum_offsets = num_offsets;
 141         return true;
 142 }
 143
 144 static char *shadow_copy2_insert_string(TALLOC_CTX *mem_ctx,
 145                                         struct vfs_handle_struct *handle,
 146                                         time_t snapshot)
 147 {
 148         const char *fmt;
 149         struct tm snap_tm;
 150         fstring snaptime_string;
 151         size_t snaptime_len;
 152
 153         fmt = lp_parm_const_string(SNUM(handle->conn), "shadow",
 154                                    "format", GMT_FORMAT);
 155
 156         if (lp_parm_bool(SNUM(handle->conn), "shadow", "sscanf", false)) {
 157                 snaptime_len = snprintf(snaptime_string, sizeof(snaptime_string), fmt,
 158                                    (unsigned long)snapshot);
 159                 if (snaptime_len <= 0) {
 160                         DEBUG(10, ("snprintf failed\n"));
 161                         return NULL;
 162                 }
 163         } else {
 164                 if (lp_parm_bool(SNUM(handle->conn), "shadow", "localtime", false)) {
 165                         if (localtime_r(&snapshot, &snap_tm) == 0) {
 166                                 DEBUG(10, ("gmtime_r failed\n"));
 167                                 return NULL;
 168                         }
 169                 } else {
 170                         if (gmtime_r(&snapshot, &snap_tm) == 0) {
 171                                 DEBUG(10, ("gmtime_r failed\n"));
 172                                 return NULL;
 173                         }
 174                 }
 175                 snaptime_len = strftime(snaptime_string, sizeof(snaptime_string), fmt,
 176                                    &snap_tm);
 177                 if (snaptime_len == 0) {
 178                         DEBUG(10, ("strftime failed\n"));
 179                         return NULL;
 180                 }
 181         }
 182         return talloc_asprintf(mem_ctx, "/%s/%s",
 183                                lp_parm_const_string(
 184                                        SNUM(handle->conn), "shadow", "snapdir",
 185                                        ".snapshots"),
 186                                snaptime_string);
 187 }
 188
 189 /**
 190  * Strip a snapshot component from an filename as
 191  * handed in via the smb layer.
 192  * Returns the parsed timestamp and the stripped filename.
 193  */
 194 static bool shadow_copy2_strip_snapshot(TALLOC_CTX *mem_ctx,
 195                                         struct vfs_handle_struct *handle,
 196                                         const char *name,
 197                                         time_t *ptimestamp,
 198                                         char **pstripped)
 199 {
 200         struct tm tm;
 201         time_t timestamp;
 202         const char *p;
 203         char *q;
 204         char *stripped;
 205         size_t rest_len, dst_len;
 206
 207         p = strstr_m(name, "@GMT-");
 208         if (p == NULL) {
 209                 goto no_snapshot;
 210         }
 211         if ((p > name) && (p[-1] != '/')) {
 212                 goto no_snapshot;
 213         }
 214         q = strptime(p, GMT_FORMAT, &tm);
 215         if (q == NULL) {
 216                 goto no_snapshot;
 217         }
 218         tm.tm_isdst = -1;
 219         timestamp = timegm(&tm);
 220         if (timestamp == (time_t)-1) {
 221                 goto no_snapshot;
 222         }
 223         if ((p == name) && (q[0] == '\0')) {
 224                 if (pstripped != NULL) {
 225                         stripped = talloc_strdup(mem_ctx, "");
 226                         if (stripped == NULL) {
 227                                 return false;
 228                         }
 229                         *pstripped = stripped;
 230                 }
 231                 *ptimestamp = timestamp;
 232                 return true;
 233         }
 234         if (q[0] != '/') {
 235                 goto no_snapshot;
 236         }
 237         q += 1;
 238
 239         rest_len = strlen(q);
 240         dst_len = (p-name) + rest_len;
 241
 242         if (lp_parm_bool(SNUM(handle->conn), "shadow", "snapdirseverywhere",
 243                          false)) {
 244                 char *insert;
 245                 bool have_insert;
 246                 insert = shadow_copy2_insert_string(talloc_tos(), handle,
 247                                                     timestamp);
 248                 if (insert == NULL) {
 249                         errno = ENOMEM;
 250                         return false;
 251                 }
 252
 253                 have_insert = (strstr(name, insert+1) != NULL);
 254                 TALLOC_FREE(insert);
 255                 if (have_insert) {
 256                         goto no_snapshot;
 257                 }
 258         }
 259
 260         if (pstripped != NULL) {
 261                 stripped = talloc_array(mem_ctx, char, dst_len+1);
 262                 if (stripped == NULL) {
 263                         errno = ENOMEM;
 264                         return false;
 265                 }
 266                 if (p > name) {
 267                         memcpy(stripped, name, p-name);
 268                 }
 269                 if (rest_len > 0) {
 270                         memcpy(stripped + (p-name), q, rest_len);
 271                 }
 272                 stripped[dst_len] = '\0';
 273                 *pstripped = stripped;
 274         }
 275         *ptimestamp = timestamp;
 276         return true;
 277 no_snapshot:
 278         *ptimestamp = 0;
 279         return true;
 280 }
 281
 282 static char *shadow_copy2_find_mount_point(TALLOC_CTX *mem_ctx,
 283                                            vfs_handle_struct *handle)
 284 {
 285         char *path = talloc_strdup(mem_ctx, handle->conn->connectpath);
 286         dev_t dev;
 287         struct stat st;
 288         char *p;
 289
 290         if (stat(path, &st) != 0) {
 291                 talloc_free(path);
 292                 return NULL;
 293         }
 294
 295         dev = st.st_dev;
 296
 297         while ((p = strrchr(path, '/')) && p > path) {
 298                 *p = 0;
 299                 if (stat(path, &st) != 0) {
 300                         talloc_free(path);
 301                         return NULL;
 302                 }
 303                 if (st.st_dev != dev) {
 304                         *p = '/';
 305                         break;
 306                 }
 307         }
 308
 309         return path;
 310 }
 311
 312 static char *shadow_copy2_convert(TALLOC_CTX *mem_ctx,
 313                                   struct vfs_handle_struct *handle,
 314                                   const char *name, time_t timestamp)
 315 {
 316         struct smb_filename converted_fname;
 317         char *result = NULL;
 318         size_t *slashes = NULL;
 319         unsigned num_slashes;
 320         char *path = NULL;
 321         size_t pathlen;
 322         char *insert = NULL;
 323         char *converted = NULL;
 324         size_t insertlen;
 325         int i, saved_errno;
 326         size_t min_offset;
 327
 328         path = talloc_asprintf(mem_ctx, "%s/%s", handle->conn->connectpath,
 329                                name);
 330         if (path == NULL) {
 331                 errno = ENOMEM;
 332                 goto fail;
 333         }
 334         pathlen = talloc_get_size(path)-1;
 335
 336         DEBUG(10, ("converting %s\n", path));
 337
 338         if (!shadow_copy2_find_slashes(talloc_tos(), path,
 339                                        &slashes, &num_slashes)) {
 340                 goto fail;
 341         }
 342         insert = shadow_copy2_insert_string(talloc_tos(), handle, timestamp);
 343         if (insert == NULL) {
 344                 goto fail;
 345         }
 346         insertlen = talloc_get_size(insert)-1;
 347         converted = talloc_array(mem_ctx, char, pathlen + insertlen + 1);
 348         if (converted == NULL) {
 349                 goto fail;
 350         }
 351
 352         if (path[pathlen-1] != '/') {
 353                 /*
 354                  * Append a fake slash to find the snapshot root
 355                  */
 356                 size_t *tmp;
 357                 tmp = talloc_realloc(talloc_tos(), slashes,
 358                                      size_t, num_slashes+1);
 359                 if (tmp == NULL) {
 360                         goto fail;
 361                 }
 362                 slashes = tmp;
 363                 slashes[num_slashes] = pathlen;
 364                 num_slashes += 1;
 365         }
 366
 367         min_offset = 0;
 368
 369         if (!lp_parm_bool(SNUM(handle->conn), "shadow", "crossmountpoints",
 370                           false)) {
 371                 char *mount_point;
 372
 373                 mount_point = shadow_copy2_find_mount_point(talloc_tos(),
 374                                                             handle);
 375                 if (mount_point == NULL) {
 376                         goto fail;
 377                 }
 378                 min_offset = strlen(mount_point);
 379                 TALLOC_FREE(mount_point);
 380         }
 381
 382         memcpy(converted, path, pathlen+1);
 383         converted[pathlen+insertlen] = '\0';
 384
 385         ZERO_STRUCT(converted_fname);
 386         converted_fname.base_name = converted;
 387
 388         for (i = num_slashes-1; i>=0; i--) {
 389                 int ret;
 390                 size_t offset;
 391
 392                 offset = slashes[i];
 393
 394                 if (offset < min_offset) {
 395                         errno = ENOENT;
 396                         goto fail;
 397                 }
 398
 399                 memcpy(converted+offset, insert, insertlen);
 400
 401                 offset += insertlen;
 402                 memcpy(converted+offset, path + slashes[i],
 403                        pathlen - slashes[i]);
 404
 405                 ret = SMB_VFS_NEXT_LSTAT(handle, &converted_fname);
 406
 407                 DEBUG(10, ("Trying %s: %d (%s)\n", converted,
 408                            ret, ret == 0 ? "ok" : strerror(errno)));
 409                 if (ret == 0) {
 410                         /* success */
 411                         break;
 412                 }
 413                 if (errno == ENOTDIR) {
 414                         /*
 415                          * This is a valid condition: We appended the
 416                          * .snaphots/@GMT.. to a file name. Just try
 417                          * with the upper levels.
 418                          */
 419                         continue;
 420                 }
 421                 if (errno != ENOENT) {
 422                         /* Other problem than "not found" */
 423                         goto fail;
 424                 }
 425         }
 426
 427         if (i >= 0) {
 428                 /*
 429                  * Found something
 430                  */
 431                 DEBUG(10, ("Found %s\n", converted));
 432                 result = converted;
 433                 converted = NULL;
 434         } else {
 435                 errno = ENOENT;
 436         }
 437 fail:
 438         saved_errno = errno;
 439         TALLOC_FREE(converted);
 440         TALLOC_FREE(insert);
 441         TALLOC_FREE(slashes);
 442         TALLOC_FREE(path);
 443         errno = saved_errno;
 444         return result;
 445 }
 446
 447 /*
 448   modify a sbuf return to ensure that inodes in the shadow directory
 449   are different from those in the main directory
 450  */
 451 static void convert_sbuf(vfs_handle_struct *handle, const char *fname,
 452                          SMB_STRUCT_STAT *sbuf)
 453 {
 454         if (lp_parm_bool(SNUM(handle->conn), "shadow", "fixinodes", False)) {
 455                 /* some snapshot systems, like GPFS, return the name
 456                    device:inode for the snapshot files as the current
 457                    files. That breaks the 'restore' button in the shadow copy
 458                    GUI, as the client gets a sharing violation.
 459
 460                    This is a crude way of allowing both files to be
 461                    open at once. It has a slight chance of inode
 462                    number collision, but I can't see a better approach
 463                    without significant VFS changes
 464                 */
 465                 uint32_t shash;
 466
 467                 shash = hash(fname, strlen(fname), 0) & 0xFF000000;
 468                 if (shash == 0) {
 469                         shash = 1;
 470                 }
 471                 sbuf->st_ex_ino ^= shash;
 472         }
 473 }
 474
 475 static DIR *shadow_copy2_opendir(vfs_handle_struct *handle,
 476                                             const char *fname,
 477                                             const char *mask,
 478                                             uint32 attr)
 479 {
 480         time_t timestamp;
 481         char *stripped;
 482         DIR *ret;
 483         int saved_errno;
 484         char *conv;
 485
 486         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
 487                                          &timestamp, &stripped)) {
 488                 return NULL;
 489         }
 490         if (timestamp == 0) {
 491                 return SMB_VFS_NEXT_OPENDIR(handle, fname, mask, attr);
 492         }
 493         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
 494         TALLOC_FREE(stripped);
 495         if (conv == NULL) {
 496                 return NULL;
 497         }
 498         ret = SMB_VFS_NEXT_OPENDIR(handle, conv, mask, attr);
 499         saved_errno = errno;
 500         TALLOC_FREE(conv);
 501         errno = saved_errno;
 502         return ret;
 503 }
 504
 505 static int shadow_copy2_rename(vfs_handle_struct *handle,
 506                                const struct smb_filename *smb_fname_src,
 507                                const struct smb_filename *smb_fname_dst)
 508 {
 509         time_t timestamp_src, timestamp_dst;
 510
 511         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
 512                                          smb_fname_src->base_name,
 513                                          &timestamp_src, NULL)) {
 514                 return -1;
 515         }
 516         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
 517                                          smb_fname_dst->base_name,
 518                                          &timestamp_dst, NULL)) {
 519                 return -1;
 520         }
 521         if (timestamp_src != 0) {
 522                 errno = EXDEV;
 523                 return -1;
 524         }
 525         if (timestamp_dst != 0) {
 526                 errno = EROFS;
 527                 return -1;
 528         }
 529         return SMB_VFS_NEXT_RENAME(handle, smb_fname_src, smb_fname_dst);
 530 }
 531
 532 static int shadow_copy2_symlink(vfs_handle_struct *handle,
 533                                 const char *oldname, const char *newname)
 534 {
 535         time_t timestamp_old, timestamp_new;
 536
 537         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, oldname,
 538                                          &timestamp_old, NULL)) {
 539                 return -1;
 540         }
 541         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, newname,
 542                                          &timestamp_new, NULL)) {
 543                 return -1;
 544         }
 545         if ((timestamp_old != 0) || (timestamp_new != 0)) {
 546                 errno = EROFS;
 547                 return -1;
 548         }
 549         return SMB_VFS_NEXT_SYMLINK(handle, oldname, newname);
 550 }
 551
 552 static int shadow_copy2_link(vfs_handle_struct *handle,
 553                              const char *oldname, const char *newname)
 554 {
 555         time_t timestamp_old, timestamp_new;
 556
 557         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, oldname,
 558                                          &timestamp_old, NULL)) {
 559                 return -1;
 560         }
 561         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, newname,
 562                                          &timestamp_new, NULL)) {
 563                 return -1;
 564         }
 565         if ((timestamp_old != 0) || (timestamp_new != 0)) {
 566                 errno = EROFS;
 567                 return -1;
 568         }
 569         return SMB_VFS_NEXT_LINK(handle, oldname, newname);
 570 }
 571
 572 static int shadow_copy2_stat(vfs_handle_struct *handle,
 573                              struct smb_filename *smb_fname)
 574 {
 575         time_t timestamp;
 576         char *stripped, *tmp;
 577         int ret, saved_errno;
 578
 579         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
 580                                          smb_fname->base_name,
 581                                          &timestamp, &stripped)) {
 582                 return -1;
 583         }
 584         if (timestamp == 0) {
 585                 return SMB_VFS_NEXT_STAT(handle, smb_fname);
 586         }
 587
 588         tmp = smb_fname->base_name;
 589         smb_fname->base_name = shadow_copy2_convert(
 590                 talloc_tos(), handle, stripped, timestamp);
 591         TALLOC_FREE(stripped);
 592
 593         if (smb_fname->base_name == NULL) {
 594                 smb_fname->base_name = tmp;
 595                 return -1;
 596         }
 597
 598         ret = SMB_VFS_NEXT_STAT(handle, smb_fname);
 599         saved_errno = errno;
 600
 601         TALLOC_FREE(smb_fname->base_name);
 602         smb_fname->base_name = tmp;
 603
 604         if (ret == 0) {
 605                 convert_sbuf(handle, smb_fname->base_name, &smb_fname->st);
 606         }
 607         errno = saved_errno;
 608         return ret;
 609 }
 610
 611 static int shadow_copy2_lstat(vfs_handle_struct *handle,
 612                               struct smb_filename *smb_fname)
 613 {
 614         time_t timestamp;
 615         char *stripped, *tmp;
 616         int ret, saved_errno;
 617
 618         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
 619                                          smb_fname->base_name,
 620                                          &timestamp, &stripped)) {
 621                 return -1;
 622         }
 623         if (timestamp == 0) {
 624                 return SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 625         }
 626
 627         tmp = smb_fname->base_name;
 628         smb_fname->base_name = shadow_copy2_convert(
 629                 talloc_tos(), handle, stripped, timestamp);
 630         TALLOC_FREE(stripped);
 631
 632         if (smb_fname->base_name == NULL) {
 633                 smb_fname->base_name = tmp;
 634                 return -1;
 635         }
 636
 637         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 638         saved_errno = errno;
 639
 640         TALLOC_FREE(smb_fname->base_name);
 641         smb_fname->base_name = tmp;
 642
 643         if (ret == 0) {
 644                 convert_sbuf(handle, smb_fname->base_name, &smb_fname->st);
 645         }
 646         errno = saved_errno;
 647         return ret;
 648 }
 649
 650 static int shadow_copy2_fstat(vfs_handle_struct *handle, files_struct *fsp,
 651                               SMB_STRUCT_STAT *sbuf)
 652 {
 653         time_t timestamp;
 654         int ret;
 655
 656         ret = SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
 657         if (ret == -1) {
 658                 return ret;
 659         }
 660         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
 661                                          fsp->fsp_name->base_name,
 662                                          &timestamp, NULL)) {
 663                 return 0;
 664         }
 665         if (timestamp != 0) {
 666                 convert_sbuf(handle, fsp->fsp_name->base_name, sbuf);
 667         }
 668         return 0;
 669 }
 670
 671 static int shadow_copy2_open(vfs_handle_struct *handle,
 672                              struct smb_filename *smb_fname, files_struct *fsp,
 673                              int flags, mode_t mode)
 674 {
 675         time_t timestamp;
 676         char *stripped, *tmp;
 677         int ret, saved_errno;
 678
 679         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
 680                                          smb_fname->base_name,
 681                                          &timestamp, &stripped)) {
 682                 return -1;
 683         }
 684         if (timestamp == 0) {
 685                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 686         }
 687
 688         tmp = smb_fname->base_name;
 689         smb_fname->base_name = shadow_copy2_convert(
 690                 talloc_tos(), handle, stripped, timestamp);
 691         TALLOC_FREE(stripped);
 692
 693         if (smb_fname->base_name == NULL) {
 694                 smb_fname->base_name = tmp;
 695                 return -1;
 696         }
 697
 698         ret = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 699         saved_errno = errno;
 700
 701         TALLOC_FREE(smb_fname->base_name);
 702         smb_fname->base_name = tmp;
 703
 704         errno = saved_errno;
 705         return ret;
 706 }
 707
 708 static int shadow_copy2_unlink(vfs_handle_struct *handle,
 709                                const struct smb_filename *smb_fname)
 710 {
 711         time_t timestamp;
 712         char *stripped;
 713         int ret, saved_errno;
 714         struct smb_filename *conv;
 715         NTSTATUS status;
 716
 717         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
 718                                          smb_fname->base_name,
 719                                          &timestamp, &stripped)) {
 720                 return -1;
 721         }
 722         if (timestamp == 0) {
 723                 return SMB_VFS_NEXT_UNLINK(handle, smb_fname);
 724         }
 725         status = copy_smb_filename(talloc_tos(), smb_fname, &conv);
 726         if (!NT_STATUS_IS_OK(status)) {
 727                 errno = ENOMEM;
 728                 return -1;
 729         }
 730         conv->base_name = shadow_copy2_convert(
 731                 conv, handle, stripped, timestamp);
 732         TALLOC_FREE(stripped);
 733         if (conv->base_name == NULL) {
 734                 return -1;
 735         }
 736         ret = SMB_VFS_NEXT_UNLINK(handle, conv);
 737         saved_errno = errno;
 738         TALLOC_FREE(conv);
 739         errno = saved_errno;
 740         return ret;
 741 }
 742
 743 static int shadow_copy2_chmod(vfs_handle_struct *handle, const char *fname,
 744                               mode_t mode)
 745 {
 746         time_t timestamp;
 747         char *stripped;
 748         int ret, saved_errno;
 749         char *conv;
 750
 751         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
 752                                          &timestamp, &stripped)) {
 753                 return -1;
 754         }
 755         if (timestamp == 0) {
 756                 return SMB_VFS_NEXT_CHMOD(handle, fname, mode);
 757         }
 758         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
 759         TALLOC_FREE(stripped);
 760         if (conv == NULL) {
 761                 return -1;
 762         }
 763         ret = SMB_VFS_NEXT_CHMOD(handle, conv, mode);
 764         saved_errno = errno;
 765         TALLOC_FREE(conv);
 766         errno = saved_errno;
 767         return ret;
 768 }
 769
 770 static int shadow_copy2_chown(vfs_handle_struct *handle, const char *fname,
 771                               uid_t uid, gid_t gid)
 772 {
 773         time_t timestamp;
 774         char *stripped;
 775         int ret, saved_errno;
 776         char *conv;
 777
 778         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
 779                                          &timestamp, &stripped)) {
 780                 return -1;
 781         }
 782         if (timestamp == 0) {
 783                 return SMB_VFS_NEXT_CHOWN(handle, fname, uid, gid);
 784         }
 785         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
 786         TALLOC_FREE(stripped);
 787         if (conv == NULL) {
 788                 return -1;
 789         }
 790         ret = SMB_VFS_NEXT_CHOWN(handle, conv, uid, gid);
 791         saved_errno = errno;
 792         TALLOC_FREE(conv);
 793         errno = saved_errno;
 794         return ret;
 795 }
 796
 797 static int shadow_copy2_chdir(vfs_handle_struct *handle,
 798                               const char *fname)
 799 {
 800         time_t timestamp;
 801         char *stripped;
 802         int ret, saved_errno;
 803         char *conv;
 804
 805         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
 806                                          &timestamp, &stripped)) {
 807                 return -1;
 808         }
 809         if (timestamp == 0) {
 810                 return SMB_VFS_NEXT_CHDIR(handle, fname);
 811         }
 812         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
 813         TALLOC_FREE(stripped);
 814         if (conv == NULL) {
 815                 return -1;
 816         }
 817         ret = SMB_VFS_NEXT_CHDIR(handle, conv);
 818         saved_errno = errno;
 819         TALLOC_FREE(conv);
 820         errno = saved_errno;
 821         return ret;
 822 }
 823
 824 static int shadow_copy2_ntimes(vfs_handle_struct *handle,
 825                                const struct smb_filename *smb_fname,
 826                                struct smb_file_time *ft)
 827 {
 828         time_t timestamp;
 829         char *stripped;
 830         int ret, saved_errno;
 831         struct smb_filename *conv;
 832         NTSTATUS status;
 833
 834         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
 835                                          smb_fname->base_name,
 836                                          &timestamp, &stripped)) {
 837                 return -1;
 838         }
 839         if (timestamp == 0) {
 840                 return SMB_VFS_NEXT_NTIMES(handle, smb_fname, ft);
 841         }
 842         status = copy_smb_filename(talloc_tos(), smb_fname, &conv);
 843         if (!NT_STATUS_IS_OK(status)) {
 844                 errno = ENOMEM;
 845                 return -1;
 846         }
 847         conv->base_name = shadow_copy2_convert(
 848                 conv, handle, stripped, timestamp);
 849         TALLOC_FREE(stripped);
 850         if (conv->base_name == NULL) {
 851                 return -1;
 852         }
 853         ret = SMB_VFS_NEXT_NTIMES(handle, conv, ft);
 854         saved_errno = errno;
 855         TALLOC_FREE(conv);
 856         errno = saved_errno;
 857         return ret;
 858 }
 859
 860 static int shadow_copy2_readlink(vfs_handle_struct *handle,
 861                                  const char *fname, char *buf, size_t bufsiz)
 862 {
 863         time_t timestamp;
 864         char *stripped;
 865         int ret, saved_errno;
 866         char *conv;
 867
 868         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
 869                                          &timestamp, &stripped)) {
 870                 return -1;
 871         }
 872         if (timestamp == 0) {
 873                 return SMB_VFS_NEXT_READLINK(handle, fname, buf, bufsiz);
 874         }
 875         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
 876         TALLOC_FREE(stripped);
 877         if (conv == NULL) {
 878                 return -1;
 879         }
 880         ret = SMB_VFS_NEXT_READLINK(handle, conv, buf, bufsiz);
 881         saved_errno = errno;
 882         TALLOC_FREE(conv);
 883         errno = saved_errno;
 884         return ret;
 885 }
 886
 887 static int shadow_copy2_mknod(vfs_handle_struct *handle,
 888                               const char *fname, mode_t mode, SMB_DEV_T dev)
 889 {
 890         time_t timestamp;
 891         char *stripped;
 892         int ret, saved_errno;
 893         char *conv;
 894
 895         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
 896                                          &timestamp, &stripped)) {
 897                 return -1;
 898         }
 899         if (timestamp == 0) {
 900                 return SMB_VFS_NEXT_MKNOD(handle, fname, mode, dev);
 901         }
 902         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
 903         TALLOC_FREE(stripped);
 904         if (conv == NULL) {
 905                 return -1;
 906         }
 907         ret = SMB_VFS_NEXT_MKNOD(handle, conv, mode, dev);
 908         saved_errno = errno;
 909         TALLOC_FREE(conv);
 910         errno = saved_errno;
 911         return ret;
 912 }
 913
 914 static char *shadow_copy2_realpath(vfs_handle_struct *handle,
 915                                    const char *fname)
 916 {
 917         time_t timestamp;
 918         char *stripped = NULL;
 919         char *tmp = NULL;
 920         char *result = NULL;
 921         char *inserted = NULL;
 922         char *inserted_to, *inserted_end;
 923         int saved_errno;
 924
 925         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
 926                                          &timestamp, &stripped)) {
 927                 goto done;
 928         }
 929         if (timestamp == 0) {
 930                 return SMB_VFS_NEXT_REALPATH(handle, fname);
 931         }
 932
 933         tmp = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
 934         if (tmp == NULL) {
 935                 goto done;
 936         }
 937
 938         result = SMB_VFS_NEXT_REALPATH(handle, tmp);
 939         if (result == NULL) {
 940                 goto done;
 941         }
 942
 943         /*
 944          * Take away what we've inserted. This removes the @GMT-thingy
 945          * completely, but will give a path under the share root.
 946          */
 947         inserted = shadow_copy2_insert_string(talloc_tos(), handle, timestamp);
 948         if (inserted == NULL) {
 949                 goto done;
 950         }
 951         inserted_to = strstr_m(result, inserted);
 952         if (inserted_to == NULL) {
 953                 DEBUG(2, ("SMB_VFS_NEXT_REALPATH removed %s\n", inserted));
 954                 goto done;
 955         }
 956         inserted_end = inserted_to + talloc_get_size(inserted) - 1;
 957         memmove(inserted_to, inserted_end, strlen(inserted_end)+1);
 958
 959 done:
 960         saved_errno = errno;
 961         TALLOC_FREE(inserted);
 962         TALLOC_FREE(tmp);
 963         TALLOC_FREE(stripped);
 964         errno = saved_errno;
 965         return result;
 966 }
 967
 968 /**
 969  * Check whether a given directory contains a
 970  * snapshot directory as direct subdirectory.
 971  * If yes, return the path of the snapshot-subdir,
 972  * otherwise return NULL.
 973  */
 974 static char *have_snapdir(struct vfs_handle_struct *handle,
 975                           const char *path)
 976 {
 977         struct smb_filename smb_fname;
 978         int ret;
 979
 980         ZERO_STRUCT(smb_fname);
 981         smb_fname.base_name = talloc_asprintf(
 982                 talloc_tos(), "%s/%s", path,
 983                 lp_parm_const_string(SNUM(handle->conn), "shadow", "snapdir",
 984                                      ".snapshots"));
 985         if (smb_fname.base_name == NULL) {
 986                 return NULL;
 987         }
 988
 989         ret = SMB_VFS_NEXT_STAT(handle, &smb_fname);
 990         if ((ret == 0) && (S_ISDIR(smb_fname.st.st_ex_mode))) {
 991                 return smb_fname.base_name;
 992         }
 993         TALLOC_FREE(smb_fname.base_name);
 994         return NULL;
 995 }
 996
 997 static char *shadow_copy2_find_snapdir(TALLOC_CTX *mem_ctx,
 998                                        struct vfs_handle_struct *handle,
 999                                        struct smb_filename *smb_fname)
1000 {
1001         char *path, *p;
1002         char *snapdir;
1003
1004         path = talloc_asprintf(mem_ctx, "%s/%s",
1005                                handle->conn->connectpath,
1006                                smb_fname->base_name);
1007         if (path == NULL) {
1008                 return NULL;
1009         }
1010
1011         snapdir = have_snapdir(handle, path);
1012         if (snapdir != NULL) {
1013                 TALLOC_FREE(path);
1014                 return snapdir;
1015         }
1016
1017         while ((p = strrchr(path, '/')) && (p > path)) {
1018
1019                 p[0] = '\0';
1020
1021                 snapdir = have_snapdir(handle, path);
1022                 if (snapdir != NULL) {
1023                         TALLOC_FREE(path);
1024                         return snapdir;
1025                 }
1026         }
1027         TALLOC_FREE(path);
1028         return NULL;
1029 }
1030
1031 static bool shadow_copy2_snapshot_to_gmt(vfs_handle_struct *handle,
1032                                          const char *name,
1033                                          char *gmt, size_t gmt_len)
1034 {
1035         struct tm timestamp;
1036         time_t timestamp_t;
1037         unsigned long int timestamp_long;
1038         const char *fmt;
1039
1040         fmt = lp_parm_const_string(SNUM(handle->conn), "shadow",
1041                                    "format", GMT_FORMAT);
1042
1043         ZERO_STRUCT(timestamp);
1044         if (lp_parm_bool(SNUM(handle->conn), "shadow", "sscanf", false)) {
1045                 if (sscanf(name, fmt, &timestamp_long) != 1) {
1046                         DEBUG(10, ("shadow_copy2_snapshot_to_gmt: "
1047                                    "no sscanf match %s: %s\n",
1048                                    fmt, name));
1049                         return false;
1050                 }
1051                 timestamp_t = timestamp_long;
1052                 gmtime_r(&timestamp_t, &timestamp);
1053         } else {
1054                 if (strptime(name, fmt, &timestamp) == NULL) {
1055                         DEBUG(10, ("shadow_copy2_snapshot_to_gmt: "
1056                                    "no match %s: %s\n",
1057                                    fmt, name));
1058                         return false;
1059                 }
1060                 DEBUG(10, ("shadow_copy2_snapshot_to_gmt: match %s: %s\n",
1061                            fmt, name));
1062
1063                 if (lp_parm_bool(SNUM(handle->conn), "shadow", "localtime", false)) {
1064                         timestamp.tm_isdst = -1;
1065                         timestamp_t = mktime(&timestamp);
1066                         gmtime_r(&timestamp_t, &timestamp);
1067                 }
1068         }
1069
1070         strftime(gmt, gmt_len, GMT_FORMAT, &timestamp);
1071         return true;
1072 }
1073
1074 static int shadow_copy2_label_cmp_asc(const void *x, const void *y)
1075 {
1076         return strncmp((const char *)x, (const char *)y, sizeof(SHADOW_COPY_LABEL));
1077 }
1078
1079 static int shadow_copy2_label_cmp_desc(const void *x, const void *y)
1080 {
1081         return -strncmp((const char *)x, (const char *)y, sizeof(SHADOW_COPY_LABEL));
1082 }
1083
1084 /*
1085   sort the shadow copy data in ascending or descending order
1086  */
1087 static void shadow_copy2_sort_data(vfs_handle_struct *handle,
1088                                    struct shadow_copy_data *shadow_copy2_data)
1089 {
1090         int (*cmpfunc)(const void *, const void *);
1091         const char *sort;
1092
1093         sort = lp_parm_const_string(SNUM(handle->conn), "shadow",
1094                                     "sort", "desc");
1095         if (sort == NULL) {
1096                 return;
1097         }
1098
1099         if (strcmp(sort, "asc") == 0) {
1100                 cmpfunc = shadow_copy2_label_cmp_asc;
1101         } else if (strcmp(sort, "desc") == 0) {
1102                 cmpfunc = shadow_copy2_label_cmp_desc;
1103         } else {
1104                 return;
1105         }
1106
1107         if (shadow_copy2_data && shadow_copy2_data->num_volumes > 0 &&
1108             shadow_copy2_data->labels)
1109         {
1110                 TYPESAFE_QSORT(shadow_copy2_data->labels,
1111                                shadow_copy2_data->num_volumes,
1112                                cmpfunc);
1113         }
1114 }
1115
1116 static int shadow_copy2_get_shadow_copy_data(
1117         vfs_handle_struct *handle, files_struct *fsp,
1118         struct shadow_copy_data *shadow_copy2_data,
1119         bool labels)
1120 {
1121         DIR *p;
1122         const char *snapdir;
1123         struct dirent *d;
1124         TALLOC_CTX *tmp_ctx = talloc_stackframe();
1125
1126         snapdir = shadow_copy2_find_snapdir(tmp_ctx, handle, fsp->fsp_name);
1127         if (snapdir == NULL) {
1128                 DEBUG(0,("shadow:snapdir not found for %s in get_shadow_copy_data\n",
1129                          handle->conn->connectpath));
1130                 errno = EINVAL;
1131                 talloc_free(tmp_ctx);
1132                 return -1;
1133         }
1134
1135         p = SMB_VFS_NEXT_OPENDIR(handle, snapdir, NULL, 0);
1136
1137         if (!p) {
1138                 DEBUG(2,("shadow_copy2: SMB_VFS_NEXT_OPENDIR() failed for '%s'"
1139                          " - %s\n", snapdir, strerror(errno)));
1140                 talloc_free(tmp_ctx);
1141                 errno = ENOSYS;
1142                 return -1;
1143         }
1144
1145         shadow_copy2_data->num_volumes = 0;
1146         shadow_copy2_data->labels      = NULL;
1147
1148         while ((d = SMB_VFS_NEXT_READDIR(handle, p, NULL))) {
1149                 char snapshot[GMT_NAME_LEN+1];
1150                 SHADOW_COPY_LABEL *tlabels;
1151
1152                 /*
1153                  * ignore names not of the right form in the snapshot
1154                  * directory
1155                  */
1156                 if (!shadow_copy2_snapshot_to_gmt(
1157                             handle, d->d_name,
1158                             snapshot, sizeof(snapshot))) {
1159
1160                         DEBUG(6, ("shadow_copy2_get_shadow_copy_data: "
1161                                   "ignoring %s\n", d->d_name));
1162                         continue;
1163                 }
1164                 DEBUG(6,("shadow_copy2_get_shadow_copy_data: %s -> %s\n",
1165                          d->d_name, snapshot));
1166
1167                 if (!labels) {
1168                         /* the caller doesn't want the labels */
1169                         shadow_copy2_data->num_volumes++;
1170                         continue;
1171                 }
1172
1173                 tlabels = talloc_realloc(shadow_copy2_data,
1174                                          shadow_copy2_data->labels,
1175                                          SHADOW_COPY_LABEL,
1176                                          shadow_copy2_data->num_volumes+1);
1177                 if (tlabels == NULL) {
1178                         DEBUG(0,("shadow_copy2: out of memory\n"));
1179                         SMB_VFS_NEXT_CLOSEDIR(handle, p);
1180                         talloc_free(tmp_ctx);
1181                         return -1;
1182                 }
1183
1184                 strlcpy(tlabels[shadow_copy2_data->num_volumes], snapshot,
1185                         sizeof(*tlabels));
1186
1187                 shadow_copy2_data->num_volumes++;
1188                 shadow_copy2_data->labels = tlabels;
1189         }
1190
1191         SMB_VFS_NEXT_CLOSEDIR(handle,p);
1192
1193         shadow_copy2_sort_data(handle, shadow_copy2_data);
1194
1195         talloc_free(tmp_ctx);
1196         return 0;
1197 }
1198
1199 static NTSTATUS shadow_copy2_fget_nt_acl(vfs_handle_struct *handle,
1200                                         struct files_struct *fsp,
1201                                         uint32 security_info,
1202                                          TALLOC_CTX *mem_ctx,
1203                                         struct security_descriptor **ppdesc)
1204 {
1205         time_t timestamp;
1206         char *stripped;
1207         NTSTATUS status;
1208         char *conv;
1209
1210         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1211                                          fsp->fsp_name->base_name,
1212                                          &timestamp, &stripped)) {
1213                 return map_nt_error_from_unix(errno);
1214         }
1215         if (timestamp == 0) {
1216                 return SMB_VFS_NEXT_FGET_NT_ACL(handle, fsp, security_info,
1217                                                 mem_ctx,
1218                                                 ppdesc);
1219         }
1220         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1221         TALLOC_FREE(stripped);
1222         if (conv == NULL) {
1223                 return map_nt_error_from_unix(errno);
1224         }
1225         status = SMB_VFS_NEXT_GET_NT_ACL(handle, conv, security_info,
1226                                          mem_ctx, ppdesc);
1227         TALLOC_FREE(conv);
1228         return status;
1229 }
1230
1231 static NTSTATUS shadow_copy2_get_nt_acl(vfs_handle_struct *handle,
1232                                         const char *fname,
1233                                         uint32 security_info,
1234                                         TALLOC_CTX *mem_ctx,
1235                                         struct security_descriptor **ppdesc)
1236 {
1237         time_t timestamp;
1238         char *stripped;
1239         NTSTATUS status;
1240         char *conv;
1241
1242         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1243                                          &timestamp, &stripped)) {
1244                 return map_nt_error_from_unix(errno);
1245         }
1246         if (timestamp == 0) {
1247                 return SMB_VFS_NEXT_GET_NT_ACL(handle, fname, security_info,
1248                                                mem_ctx, ppdesc);
1249         }
1250         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1251         TALLOC_FREE(stripped);
1252         if (conv == NULL) {
1253                 return map_nt_error_from_unix(errno);
1254         }
1255         status = SMB_VFS_NEXT_GET_NT_ACL(handle, conv, security_info,
1256                                          mem_ctx, ppdesc);
1257         TALLOC_FREE(conv);
1258         return status;
1259 }
1260
1261 static int shadow_copy2_mkdir(vfs_handle_struct *handle,
1262                               const char *fname, mode_t mode)
1263 {
1264         time_t timestamp;
1265         char *stripped;
1266         int ret, saved_errno;
1267         char *conv;
1268
1269         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1270                                          &timestamp, &stripped)) {
1271                 return -1;
1272         }
1273         if (timestamp == 0) {
1274                 return SMB_VFS_NEXT_MKDIR(handle, fname, mode);
1275         }
1276         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1277         TALLOC_FREE(stripped);
1278         if (conv == NULL) {
1279                 return -1;
1280         }
1281         ret = SMB_VFS_NEXT_MKDIR(handle, conv, mode);
1282         saved_errno = errno;
1283         TALLOC_FREE(conv);
1284         errno = saved_errno;
1285         return ret;
1286 }
1287
1288 static int shadow_copy2_rmdir(vfs_handle_struct *handle, const char *fname)
1289 {
1290         time_t timestamp;
1291         char *stripped;
1292         int ret, saved_errno;
1293         char *conv;
1294
1295         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1296                                          &timestamp, &stripped)) {
1297                 return -1;
1298         }
1299         if (timestamp == 0) {
1300                 return SMB_VFS_NEXT_RMDIR(handle, fname);
1301         }
1302         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1303         TALLOC_FREE(stripped);
1304         if (conv == NULL) {
1305                 return -1;
1306         }
1307         ret = SMB_VFS_NEXT_RMDIR(handle, conv);
1308         saved_errno = errno;
1309         TALLOC_FREE(conv);
1310         errno = saved_errno;
1311         return ret;
1312 }
1313
1314 static int shadow_copy2_chflags(vfs_handle_struct *handle, const char *fname,
1315                                 unsigned int flags)
1316 {
1317         time_t timestamp;
1318         char *stripped;
1319         int ret, saved_errno;
1320         char *conv;
1321
1322         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1323                                          &timestamp, &stripped)) {
1324                 return -1;
1325         }
1326         if (timestamp == 0) {
1327                 return SMB_VFS_NEXT_CHFLAGS(handle, fname, flags);
1328         }
1329         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1330         TALLOC_FREE(stripped);
1331         if (conv == NULL) {
1332                 return -1;
1333         }
1334         ret = SMB_VFS_NEXT_CHFLAGS(handle, conv, flags);
1335         saved_errno = errno;
1336         TALLOC_FREE(conv);
1337         errno = saved_errno;
1338         return ret;
1339 }
1340
1341 static ssize_t shadow_copy2_getxattr(vfs_handle_struct *handle,
1342                                      const char *fname, const char *aname,
1343                                      void *value, size_t size)
1344 {
1345         time_t timestamp;
1346         char *stripped;
1347         ssize_t ret;
1348         int saved_errno;
1349         char *conv;
1350
1351         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1352                                          &timestamp, &stripped)) {
1353                 return -1;
1354         }
1355         if (timestamp == 0) {
1356                 return SMB_VFS_NEXT_GETXATTR(handle, fname, aname, value,
1357                                              size);
1358         }
1359         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1360         TALLOC_FREE(stripped);
1361         if (conv == NULL) {
1362                 return -1;
1363         }
1364         ret = SMB_VFS_NEXT_GETXATTR(handle, conv, aname, value, size);
1365         saved_errno = errno;
1366         TALLOC_FREE(conv);
1367         errno = saved_errno;
1368         return ret;
1369 }
1370
1371 static ssize_t shadow_copy2_listxattr(struct vfs_handle_struct *handle,
1372                                       const char *fname,
1373                                       char *list, size_t size)
1374 {
1375         time_t timestamp;
1376         char *stripped;
1377         ssize_t ret;
1378         int saved_errno;
1379         char *conv;
1380
1381         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1382                                          &timestamp, &stripped)) {
1383                 return -1;
1384         }
1385         if (timestamp == 0) {
1386                 return SMB_VFS_NEXT_LISTXATTR(handle, fname, list, size);
1387         }
1388         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1389         TALLOC_FREE(stripped);
1390         if (conv == NULL) {
1391                 return -1;
1392         }
1393         ret = SMB_VFS_NEXT_LISTXATTR(handle, conv, list, size);
1394         saved_errno = errno;
1395         TALLOC_FREE(conv);
1396         errno = saved_errno;
1397         return ret;
1398 }
1399
1400 static int shadow_copy2_removexattr(vfs_handle_struct *handle,
1401                                     const char *fname, const char *aname)
1402 {
1403         time_t timestamp;
1404         char *stripped;
1405         int ret, saved_errno;
1406         char *conv;
1407
1408         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1409                                          &timestamp, &stripped)) {
1410                 return -1;
1411         }
1412         if (timestamp == 0) {
1413                 return SMB_VFS_NEXT_REMOVEXATTR(handle, fname, aname);
1414         }
1415         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1416         TALLOC_FREE(stripped);
1417         if (conv == NULL) {
1418                 return -1;
1419         }
1420         ret = SMB_VFS_NEXT_REMOVEXATTR(handle, conv, aname);
1421         saved_errno = errno;
1422         TALLOC_FREE(conv);
1423         errno = saved_errno;
1424         return ret;
1425 }
1426
1427 static int shadow_copy2_setxattr(struct vfs_handle_struct *handle,
1428                                  const char *fname,
1429                                  const char *aname, const void *value,
1430                                  size_t size, int flags)
1431 {
1432         time_t timestamp;
1433         char *stripped;
1434         ssize_t ret;
1435         int saved_errno;
1436         char *conv;
1437
1438         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1439                                          &timestamp, &stripped)) {
1440                 return -1;
1441         }
1442         if (timestamp == 0) {
1443                 return SMB_VFS_NEXT_SETXATTR(handle, fname, aname, value, size,
1444                                              flags);
1445         }
1446         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1447         TALLOC_FREE(stripped);
1448         if (conv == NULL) {
1449                 return -1;
1450         }
1451         ret = SMB_VFS_NEXT_SETXATTR(handle, conv, aname, value, size, flags);
1452         saved_errno = errno;
1453         TALLOC_FREE(conv);
1454         errno = saved_errno;
1455         return ret;
1456 }
1457
1458 static int shadow_copy2_chmod_acl(vfs_handle_struct *handle,
1459                                   const char *fname, mode_t mode)
1460 {
1461         time_t timestamp;
1462         char *stripped;
1463         ssize_t ret;
1464         int saved_errno;
1465         char *conv;
1466
1467         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1468                                          &timestamp, &stripped)) {
1469                 return -1;
1470         }
1471         if (timestamp == 0) {
1472                 return SMB_VFS_NEXT_CHMOD_ACL(handle, fname, mode);
1473         }
1474         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1475         TALLOC_FREE(stripped);
1476         if (conv == NULL) {
1477                 return -1;
1478         }
1479         ret = SMB_VFS_NEXT_CHMOD_ACL(handle, conv, mode);
1480         saved_errno = errno;
1481         TALLOC_FREE(conv);
1482         errno = saved_errno;
1483         return ret;
1484 }
1485
1486 static int shadow_copy2_get_real_filename(struct vfs_handle_struct *handle,
1487                                           const char *path,
1488                                           const char *name,
1489                                           TALLOC_CTX *mem_ctx,
1490                                           char **found_name)
1491 {
1492         time_t timestamp;
1493         char *stripped;
1494         ssize_t ret;
1495         int saved_errno;
1496         char *conv;
1497
1498         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, path,
1499                                          &timestamp, &stripped)) {
1500                 return -1;
1501         }
1502         if (timestamp == 0) {
1503                 return SMB_VFS_NEXT_GET_REAL_FILENAME(handle, path, name,
1504                                                       mem_ctx, found_name);
1505         }
1506         if (stripped[0] == '\0') {
1507                 *found_name = talloc_strdup(mem_ctx, name);
1508                 if (*found_name == NULL) {
1509                         errno = ENOMEM;
1510                         return -1;
1511                 }
1512                 return 0;
1513         }
1514         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1515         TALLOC_FREE(stripped);
1516         if (conv == NULL) {
1517                 return -1;
1518         }
1519         ret = SMB_VFS_NEXT_GET_REAL_FILENAME(handle, conv, name,
1520                                              mem_ctx, found_name);
1521         saved_errno = errno;
1522         TALLOC_FREE(conv);
1523         errno = saved_errno;
1524         return ret;
1525 }
1526
1527
1528 static struct vfs_fn_pointers vfs_shadow_copy2_fns = {
1529         .opendir_fn = shadow_copy2_opendir,
1530         .rename_fn = shadow_copy2_rename,
1531         .link_fn = shadow_copy2_link,
1532         .symlink_fn = shadow_copy2_symlink,
1533         .stat_fn = shadow_copy2_stat,
1534         .lstat_fn = shadow_copy2_lstat,
1535         .fstat_fn = shadow_copy2_fstat,
1536         .open_fn = shadow_copy2_open,
1537         .unlink_fn = shadow_copy2_unlink,
1538         .chmod_fn = shadow_copy2_chmod,
1539         .chown_fn = shadow_copy2_chown,
1540         .chdir_fn = shadow_copy2_chdir,
1541         .ntimes_fn = shadow_copy2_ntimes,
1542         .readlink_fn = shadow_copy2_readlink,
1543         .mknod_fn = shadow_copy2_mknod,
1544         .realpath_fn = shadow_copy2_realpath,
1545         .get_nt_acl_fn = shadow_copy2_get_nt_acl,
1546         .fget_nt_acl_fn = shadow_copy2_fget_nt_acl,
1547         .get_shadow_copy_data_fn = shadow_copy2_get_shadow_copy_data,
1548         .mkdir_fn = shadow_copy2_mkdir,
1549         .rmdir_fn = shadow_copy2_rmdir,
1550         .getxattr_fn = shadow_copy2_getxattr,
1551         .listxattr_fn = shadow_copy2_listxattr,
1552         .removexattr_fn = shadow_copy2_removexattr,
1553         .setxattr_fn = shadow_copy2_setxattr,
1554         .chmod_acl_fn = shadow_copy2_chmod_acl,
1555         .chflags_fn = shadow_copy2_chflags,
1556         .get_real_filename_fn = shadow_copy2_get_real_filename,
1557 };
1558
1559 NTSTATUS vfs_shadow_copy2_init(void);
1560 NTSTATUS vfs_shadow_copy2_init(void)
1561 {
1562         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION,
1563                                 "shadow_copy2", &vfs_shadow_copy2_fns);
1564 }