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
 716         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
 717                                          smb_fname->base_name,
 718                                          &timestamp, &stripped)) {
 719                 return -1;
 720         }
 721         if (timestamp == 0) {
 722                 return SMB_VFS_NEXT_UNLINK(handle, smb_fname);
 723         }
 724         conv = cp_smb_filename(talloc_tos(), smb_fname);
 725         if (conv == NULL) {
 726                 errno = ENOMEM;
 727                 return -1;
 728         }
 729         conv->base_name = shadow_copy2_convert(
 730                 conv, handle, stripped, timestamp);
 731         TALLOC_FREE(stripped);
 732         if (conv->base_name == NULL) {
 733                 return -1;
 734         }
 735         ret = SMB_VFS_NEXT_UNLINK(handle, conv);
 736         saved_errno = errno;
 737         TALLOC_FREE(conv);
 738         errno = saved_errno;
 739         return ret;
 740 }
 741
 742 static int shadow_copy2_chmod(vfs_handle_struct *handle, const char *fname,
 743                               mode_t mode)
 744 {
 745         time_t timestamp;
 746         char *stripped;
 747         int ret, saved_errno;
 748         char *conv;
 749
 750         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
 751                                          &timestamp, &stripped)) {
 752                 return -1;
 753         }
 754         if (timestamp == 0) {
 755                 return SMB_VFS_NEXT_CHMOD(handle, fname, mode);
 756         }
 757         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
 758         TALLOC_FREE(stripped);
 759         if (conv == NULL) {
 760                 return -1;
 761         }
 762         ret = SMB_VFS_NEXT_CHMOD(handle, conv, mode);
 763         saved_errno = errno;
 764         TALLOC_FREE(conv);
 765         errno = saved_errno;
 766         return ret;
 767 }
 768
 769 static int shadow_copy2_chown(vfs_handle_struct *handle, const char *fname,
 770                               uid_t uid, gid_t gid)
 771 {
 772         time_t timestamp;
 773         char *stripped;
 774         int ret, saved_errno;
 775         char *conv;
 776
 777         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
 778                                          &timestamp, &stripped)) {
 779                 return -1;
 780         }
 781         if (timestamp == 0) {
 782                 return SMB_VFS_NEXT_CHOWN(handle, fname, uid, gid);
 783         }
 784         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
 785         TALLOC_FREE(stripped);
 786         if (conv == NULL) {
 787                 return -1;
 788         }
 789         ret = SMB_VFS_NEXT_CHOWN(handle, conv, uid, gid);
 790         saved_errno = errno;
 791         TALLOC_FREE(conv);
 792         errno = saved_errno;
 793         return ret;
 794 }
 795
 796 static int shadow_copy2_chdir(vfs_handle_struct *handle,
 797                               const char *fname)
 798 {
 799         time_t timestamp;
 800         char *stripped;
 801         int ret, saved_errno;
 802         char *conv;
 803
 804         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
 805                                          &timestamp, &stripped)) {
 806                 return -1;
 807         }
 808         if (timestamp == 0) {
 809                 return SMB_VFS_NEXT_CHDIR(handle, fname);
 810         }
 811         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
 812         TALLOC_FREE(stripped);
 813         if (conv == NULL) {
 814                 return -1;
 815         }
 816         ret = SMB_VFS_NEXT_CHDIR(handle, conv);
 817         saved_errno = errno;
 818         TALLOC_FREE(conv);
 819         errno = saved_errno;
 820         return ret;
 821 }
 822
 823 static int shadow_copy2_ntimes(vfs_handle_struct *handle,
 824                                const struct smb_filename *smb_fname,
 825                                struct smb_file_time *ft)
 826 {
 827         time_t timestamp;
 828         char *stripped;
 829         int ret, saved_errno;
 830         struct smb_filename *conv;
 831
 832         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
 833                                          smb_fname->base_name,
 834                                          &timestamp, &stripped)) {
 835                 return -1;
 836         }
 837         if (timestamp == 0) {
 838                 return SMB_VFS_NEXT_NTIMES(handle, smb_fname, ft);
 839         }
 840         conv = cp_smb_filename(talloc_tos(), smb_fname);
 841         if (conv == NULL) {
 842                 errno = ENOMEM;
 843                 return -1;
 844         }
 845         conv->base_name = shadow_copy2_convert(
 846                 conv, handle, stripped, timestamp);
 847         TALLOC_FREE(stripped);
 848         if (conv->base_name == NULL) {
 849                 return -1;
 850         }
 851         ret = SMB_VFS_NEXT_NTIMES(handle, conv, ft);
 852         saved_errno = errno;
 853         TALLOC_FREE(conv);
 854         errno = saved_errno;
 855         return ret;
 856 }
 857
 858 static int shadow_copy2_readlink(vfs_handle_struct *handle,
 859                                  const char *fname, char *buf, size_t bufsiz)
 860 {
 861         time_t timestamp;
 862         char *stripped;
 863         int ret, saved_errno;
 864         char *conv;
 865
 866         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
 867                                          &timestamp, &stripped)) {
 868                 return -1;
 869         }
 870         if (timestamp == 0) {
 871                 return SMB_VFS_NEXT_READLINK(handle, fname, buf, bufsiz);
 872         }
 873         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
 874         TALLOC_FREE(stripped);
 875         if (conv == NULL) {
 876                 return -1;
 877         }
 878         ret = SMB_VFS_NEXT_READLINK(handle, conv, buf, bufsiz);
 879         saved_errno = errno;
 880         TALLOC_FREE(conv);
 881         errno = saved_errno;
 882         return ret;
 883 }
 884
 885 static int shadow_copy2_mknod(vfs_handle_struct *handle,
 886                               const char *fname, mode_t mode, SMB_DEV_T dev)
 887 {
 888         time_t timestamp;
 889         char *stripped;
 890         int ret, saved_errno;
 891         char *conv;
 892
 893         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
 894                                          &timestamp, &stripped)) {
 895                 return -1;
 896         }
 897         if (timestamp == 0) {
 898                 return SMB_VFS_NEXT_MKNOD(handle, fname, mode, dev);
 899         }
 900         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
 901         TALLOC_FREE(stripped);
 902         if (conv == NULL) {
 903                 return -1;
 904         }
 905         ret = SMB_VFS_NEXT_MKNOD(handle, conv, mode, dev);
 906         saved_errno = errno;
 907         TALLOC_FREE(conv);
 908         errno = saved_errno;
 909         return ret;
 910 }
 911
 912 static char *shadow_copy2_realpath(vfs_handle_struct *handle,
 913                                    const char *fname)
 914 {
 915         time_t timestamp;
 916         char *stripped = NULL;
 917         char *tmp = NULL;
 918         char *result = NULL;
 919         char *inserted = NULL;
 920         char *inserted_to, *inserted_end;
 921         int saved_errno;
 922
 923         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
 924                                          &timestamp, &stripped)) {
 925                 goto done;
 926         }
 927         if (timestamp == 0) {
 928                 return SMB_VFS_NEXT_REALPATH(handle, fname);
 929         }
 930
 931         tmp = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
 932         if (tmp == NULL) {
 933                 goto done;
 934         }
 935
 936         result = SMB_VFS_NEXT_REALPATH(handle, tmp);
 937         if (result == NULL) {
 938                 goto done;
 939         }
 940
 941         /*
 942          * Take away what we've inserted. This removes the @GMT-thingy
 943          * completely, but will give a path under the share root.
 944          */
 945         inserted = shadow_copy2_insert_string(talloc_tos(), handle, timestamp);
 946         if (inserted == NULL) {
 947                 goto done;
 948         }
 949         inserted_to = strstr_m(result, inserted);
 950         if (inserted_to == NULL) {
 951                 DEBUG(2, ("SMB_VFS_NEXT_REALPATH removed %s\n", inserted));
 952                 goto done;
 953         }
 954         inserted_end = inserted_to + talloc_get_size(inserted) - 1;
 955         memmove(inserted_to, inserted_end, strlen(inserted_end)+1);
 956
 957 done:
 958         saved_errno = errno;
 959         TALLOC_FREE(inserted);
 960         TALLOC_FREE(tmp);
 961         TALLOC_FREE(stripped);
 962         errno = saved_errno;
 963         return result;
 964 }
 965
 966 static char *have_snapdir(struct vfs_handle_struct *handle,
 967                           const char *path)
 968 {
 969         struct smb_filename smb_fname;
 970         int ret;
 971
 972         ZERO_STRUCT(smb_fname);
 973         smb_fname.base_name = talloc_asprintf(
 974                 talloc_tos(), "%s/%s", path,
 975                 lp_parm_const_string(SNUM(handle->conn), "shadow", "snapdir",
 976                                      ".snapshots"));
 977         if (smb_fname.base_name == NULL) {
 978                 return NULL;
 979         }
 980
 981         ret = SMB_VFS_NEXT_STAT(handle, &smb_fname);
 982         if ((ret == 0) && (S_ISDIR(smb_fname.st.st_ex_mode))) {
 983                 return smb_fname.base_name;
 984         }
 985         TALLOC_FREE(smb_fname.base_name);
 986         return NULL;
 987 }
 988
 989 static char *shadow_copy2_find_snapdir(TALLOC_CTX *mem_ctx,
 990                                        struct vfs_handle_struct *handle,
 991                                        struct smb_filename *smb_fname)
 992 {
 993         char *path, *p;
 994         char *snapdir;
 995
 996         path = talloc_asprintf(mem_ctx, "%s/%s",
 997                                handle->conn->connectpath,
 998                                smb_fname->base_name);
 999         if (path == NULL) {
1000                 return NULL;
1001         }
1002
1003         snapdir = have_snapdir(handle, path);
1004         if (snapdir != NULL) {
1005                 TALLOC_FREE(path);
1006                 return snapdir;
1007         }
1008
1009         while ((p = strrchr(path, '/')) && (p > path)) {
1010
1011                 p[0] = '\0';
1012
1013                 snapdir = have_snapdir(handle, path);
1014                 if (snapdir != NULL) {
1015                         TALLOC_FREE(path);
1016                         return snapdir;
1017                 }
1018         }
1019         TALLOC_FREE(path);
1020         return NULL;
1021 }
1022
1023 static bool shadow_copy2_snapshot_to_gmt(vfs_handle_struct *handle,
1024                                          const char *name,
1025                                          char *gmt, size_t gmt_len)
1026 {
1027         struct tm timestamp;
1028         time_t timestamp_t;
1029         unsigned long int timestamp_long;
1030         const char *fmt;
1031
1032         fmt = lp_parm_const_string(SNUM(handle->conn), "shadow",
1033                                    "format", GMT_FORMAT);
1034
1035         ZERO_STRUCT(timestamp);
1036         if (lp_parm_bool(SNUM(handle->conn), "shadow", "sscanf", false)) {
1037                 if (sscanf(name, fmt, &timestamp_long) != 1) {
1038                         DEBUG(10, ("shadow_copy2_snapshot_to_gmt: "
1039                                    "no sscanf match %s: %s\n",
1040                                    fmt, name));
1041                         return false;
1042                 }
1043                 timestamp_t = timestamp_long;
1044                 gmtime_r(&timestamp_t, &timestamp);
1045         } else {
1046                 if (strptime(name, fmt, &timestamp) == NULL) {
1047                         DEBUG(10, ("shadow_copy2_snapshot_to_gmt: "
1048                                    "no match %s: %s\n",
1049                                    fmt, name));
1050                         return false;
1051                 }
1052                 DEBUG(10, ("shadow_copy2_snapshot_to_gmt: match %s: %s\n",
1053                            fmt, name));
1054
1055                 if (lp_parm_bool(SNUM(handle->conn), "shadow", "localtime", false)) {
1056                         timestamp.tm_isdst = -1;
1057                         timestamp_t = mktime(&timestamp);
1058                         gmtime_r(&timestamp_t, &timestamp);
1059                 }
1060         }
1061
1062         strftime(gmt, gmt_len, GMT_FORMAT, &timestamp);
1063         return true;
1064 }
1065
1066 static int shadow_copy2_label_cmp_asc(const void *x, const void *y)
1067 {
1068         return strncmp((const char *)x, (const char *)y, sizeof(SHADOW_COPY_LABEL));
1069 }
1070
1071 static int shadow_copy2_label_cmp_desc(const void *x, const void *y)
1072 {
1073         return -strncmp((const char *)x, (const char *)y, sizeof(SHADOW_COPY_LABEL));
1074 }
1075
1076 /*
1077   sort the shadow copy data in ascending or descending order
1078  */
1079 static void shadow_copy2_sort_data(vfs_handle_struct *handle,
1080                                    struct shadow_copy_data *shadow_copy2_data)
1081 {
1082         int (*cmpfunc)(const void *, const void *);
1083         const char *sort;
1084
1085         sort = lp_parm_const_string(SNUM(handle->conn), "shadow",
1086                                     "sort", "desc");
1087         if (sort == NULL) {
1088                 return;
1089         }
1090
1091         if (strcmp(sort, "asc") == 0) {
1092                 cmpfunc = shadow_copy2_label_cmp_asc;
1093         } else if (strcmp(sort, "desc") == 0) {
1094                 cmpfunc = shadow_copy2_label_cmp_desc;
1095         } else {
1096                 return;
1097         }
1098
1099         if (shadow_copy2_data && shadow_copy2_data->num_volumes > 0 &&
1100             shadow_copy2_data->labels)
1101         {
1102                 TYPESAFE_QSORT(shadow_copy2_data->labels,
1103                                shadow_copy2_data->num_volumes,
1104                                cmpfunc);
1105         }
1106 }
1107
1108 static int shadow_copy2_get_shadow_copy_data(
1109         vfs_handle_struct *handle, files_struct *fsp,
1110         struct shadow_copy_data *shadow_copy2_data,
1111         bool labels)
1112 {
1113         DIR *p;
1114         const char *snapdir;
1115         struct dirent *d;
1116         TALLOC_CTX *tmp_ctx = talloc_stackframe();
1117
1118         snapdir = shadow_copy2_find_snapdir(tmp_ctx, handle, fsp->fsp_name);
1119         if (snapdir == NULL) {
1120                 DEBUG(0,("shadow:snapdir not found for %s in get_shadow_copy_data\n",
1121                          handle->conn->connectpath));
1122                 errno = EINVAL;
1123                 talloc_free(tmp_ctx);
1124                 return -1;
1125         }
1126
1127         p = SMB_VFS_NEXT_OPENDIR(handle, snapdir, NULL, 0);
1128
1129         if (!p) {
1130                 DEBUG(2,("shadow_copy2: SMB_VFS_NEXT_OPENDIR() failed for '%s'"
1131                          " - %s\n", snapdir, strerror(errno)));
1132                 talloc_free(tmp_ctx);
1133                 errno = ENOSYS;
1134                 return -1;
1135         }
1136
1137         shadow_copy2_data->num_volumes = 0;
1138         shadow_copy2_data->labels      = NULL;
1139
1140         while ((d = SMB_VFS_NEXT_READDIR(handle, p, NULL))) {
1141                 char snapshot[GMT_NAME_LEN+1];
1142                 SHADOW_COPY_LABEL *tlabels;
1143
1144                 /*
1145                  * ignore names not of the right form in the snapshot
1146                  * directory
1147                  */
1148                 if (!shadow_copy2_snapshot_to_gmt(
1149                             handle, d->d_name,
1150                             snapshot, sizeof(snapshot))) {
1151
1152                         DEBUG(6, ("shadow_copy2_get_shadow_copy_data: "
1153                                   "ignoring %s\n", d->d_name));
1154                         continue;
1155                 }
1156                 DEBUG(6,("shadow_copy2_get_shadow_copy_data: %s -> %s\n",
1157                          d->d_name, snapshot));
1158
1159                 if (!labels) {
1160                         /* the caller doesn't want the labels */
1161                         shadow_copy2_data->num_volumes++;
1162                         continue;
1163                 }
1164
1165                 tlabels = talloc_realloc(shadow_copy2_data,
1166                                          shadow_copy2_data->labels,
1167                                          SHADOW_COPY_LABEL,
1168                                          shadow_copy2_data->num_volumes+1);
1169                 if (tlabels == NULL) {
1170                         DEBUG(0,("shadow_copy2: out of memory\n"));
1171                         SMB_VFS_NEXT_CLOSEDIR(handle, p);
1172                         talloc_free(tmp_ctx);
1173                         return -1;
1174                 }
1175
1176                 strlcpy(tlabels[shadow_copy2_data->num_volumes], snapshot,
1177                         sizeof(*tlabels));
1178
1179                 shadow_copy2_data->num_volumes++;
1180                 shadow_copy2_data->labels = tlabels;
1181         }
1182
1183         SMB_VFS_NEXT_CLOSEDIR(handle,p);
1184
1185         shadow_copy2_sort_data(handle, shadow_copy2_data);
1186
1187         talloc_free(tmp_ctx);
1188         return 0;
1189 }
1190
1191 static NTSTATUS shadow_copy2_fget_nt_acl(vfs_handle_struct *handle,
1192                                         struct files_struct *fsp,
1193                                         uint32 security_info,
1194                                          TALLOC_CTX *mem_ctx,
1195                                         struct security_descriptor **ppdesc)
1196 {
1197         time_t timestamp;
1198         char *stripped;
1199         NTSTATUS status;
1200         char *conv;
1201
1202         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1203                                          fsp->fsp_name->base_name,
1204                                          &timestamp, &stripped)) {
1205                 return map_nt_error_from_unix(errno);
1206         }
1207         if (timestamp == 0) {
1208                 return SMB_VFS_NEXT_FGET_NT_ACL(handle, fsp, security_info,
1209                                                 mem_ctx,
1210                                                 ppdesc);
1211         }
1212         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1213         TALLOC_FREE(stripped);
1214         if (conv == NULL) {
1215                 return map_nt_error_from_unix(errno);
1216         }
1217         status = SMB_VFS_NEXT_GET_NT_ACL(handle, conv, security_info,
1218                                          mem_ctx, ppdesc);
1219         TALLOC_FREE(conv);
1220         return status;
1221 }
1222
1223 static NTSTATUS shadow_copy2_get_nt_acl(vfs_handle_struct *handle,
1224                                         const char *fname,
1225                                         uint32 security_info,
1226                                         TALLOC_CTX *mem_ctx,
1227                                         struct security_descriptor **ppdesc)
1228 {
1229         time_t timestamp;
1230         char *stripped;
1231         NTSTATUS status;
1232         char *conv;
1233
1234         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1235                                          &timestamp, &stripped)) {
1236                 return map_nt_error_from_unix(errno);
1237         }
1238         if (timestamp == 0) {
1239                 return SMB_VFS_NEXT_GET_NT_ACL(handle, fname, security_info,
1240                                                mem_ctx, ppdesc);
1241         }
1242         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1243         TALLOC_FREE(stripped);
1244         if (conv == NULL) {
1245                 return map_nt_error_from_unix(errno);
1246         }
1247         status = SMB_VFS_NEXT_GET_NT_ACL(handle, conv, security_info,
1248                                          mem_ctx, ppdesc);
1249         TALLOC_FREE(conv);
1250         return status;
1251 }
1252
1253 static int shadow_copy2_mkdir(vfs_handle_struct *handle,
1254                               const char *fname, mode_t mode)
1255 {
1256         time_t timestamp;
1257         char *stripped;
1258         int ret, saved_errno;
1259         char *conv;
1260
1261         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1262                                          &timestamp, &stripped)) {
1263                 return -1;
1264         }
1265         if (timestamp == 0) {
1266                 return SMB_VFS_NEXT_MKDIR(handle, fname, mode);
1267         }
1268         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1269         TALLOC_FREE(stripped);
1270         if (conv == NULL) {
1271                 return -1;
1272         }
1273         ret = SMB_VFS_NEXT_MKDIR(handle, conv, mode);
1274         saved_errno = errno;
1275         TALLOC_FREE(conv);
1276         errno = saved_errno;
1277         return ret;
1278 }
1279
1280 static int shadow_copy2_rmdir(vfs_handle_struct *handle, const char *fname)
1281 {
1282         time_t timestamp;
1283         char *stripped;
1284         int ret, saved_errno;
1285         char *conv;
1286
1287         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1288                                          &timestamp, &stripped)) {
1289                 return -1;
1290         }
1291         if (timestamp == 0) {
1292                 return SMB_VFS_NEXT_RMDIR(handle, fname);
1293         }
1294         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1295         TALLOC_FREE(stripped);
1296         if (conv == NULL) {
1297                 return -1;
1298         }
1299         ret = SMB_VFS_NEXT_RMDIR(handle, conv);
1300         saved_errno = errno;
1301         TALLOC_FREE(conv);
1302         errno = saved_errno;
1303         return ret;
1304 }
1305
1306 static int shadow_copy2_chflags(vfs_handle_struct *handle, const char *fname,
1307                                 unsigned int flags)
1308 {
1309         time_t timestamp;
1310         char *stripped;
1311         int ret, saved_errno;
1312         char *conv;
1313
1314         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1315                                          &timestamp, &stripped)) {
1316                 return -1;
1317         }
1318         if (timestamp == 0) {
1319                 return SMB_VFS_NEXT_CHFLAGS(handle, fname, flags);
1320         }
1321         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1322         TALLOC_FREE(stripped);
1323         if (conv == NULL) {
1324                 return -1;
1325         }
1326         ret = SMB_VFS_NEXT_CHFLAGS(handle, conv, flags);
1327         saved_errno = errno;
1328         TALLOC_FREE(conv);
1329         errno = saved_errno;
1330         return ret;
1331 }
1332
1333 static ssize_t shadow_copy2_getxattr(vfs_handle_struct *handle,
1334                                      const char *fname, const char *aname,
1335                                      void *value, size_t size)
1336 {
1337         time_t timestamp;
1338         char *stripped;
1339         ssize_t ret;
1340         int saved_errno;
1341         char *conv;
1342
1343         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1344                                          &timestamp, &stripped)) {
1345                 return -1;
1346         }
1347         if (timestamp == 0) {
1348                 return SMB_VFS_NEXT_GETXATTR(handle, fname, aname, value,
1349                                              size);
1350         }
1351         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1352         TALLOC_FREE(stripped);
1353         if (conv == NULL) {
1354                 return -1;
1355         }
1356         ret = SMB_VFS_NEXT_GETXATTR(handle, conv, aname, value, size);
1357         saved_errno = errno;
1358         TALLOC_FREE(conv);
1359         errno = saved_errno;
1360         return ret;
1361 }
1362
1363 static ssize_t shadow_copy2_listxattr(struct vfs_handle_struct *handle,
1364                                       const char *fname,
1365                                       char *list, size_t size)
1366 {
1367         time_t timestamp;
1368         char *stripped;
1369         ssize_t ret;
1370         int saved_errno;
1371         char *conv;
1372
1373         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1374                                          &timestamp, &stripped)) {
1375                 return -1;
1376         }
1377         if (timestamp == 0) {
1378                 return SMB_VFS_NEXT_LISTXATTR(handle, fname, list, size);
1379         }
1380         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1381         TALLOC_FREE(stripped);
1382         if (conv == NULL) {
1383                 return -1;
1384         }
1385         ret = SMB_VFS_NEXT_LISTXATTR(handle, conv, list, size);
1386         saved_errno = errno;
1387         TALLOC_FREE(conv);
1388         errno = saved_errno;
1389         return ret;
1390 }
1391
1392 static int shadow_copy2_removexattr(vfs_handle_struct *handle,
1393                                     const char *fname, const char *aname)
1394 {
1395         time_t timestamp;
1396         char *stripped;
1397         int ret, saved_errno;
1398         char *conv;
1399
1400         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1401                                          &timestamp, &stripped)) {
1402                 return -1;
1403         }
1404         if (timestamp == 0) {
1405                 return SMB_VFS_NEXT_REMOVEXATTR(handle, fname, aname);
1406         }
1407         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1408         TALLOC_FREE(stripped);
1409         if (conv == NULL) {
1410                 return -1;
1411         }
1412         ret = SMB_VFS_NEXT_REMOVEXATTR(handle, conv, aname);
1413         saved_errno = errno;
1414         TALLOC_FREE(conv);
1415         errno = saved_errno;
1416         return ret;
1417 }
1418
1419 static int shadow_copy2_setxattr(struct vfs_handle_struct *handle,
1420                                  const char *fname,
1421                                  const char *aname, const void *value,
1422                                  size_t size, int flags)
1423 {
1424         time_t timestamp;
1425         char *stripped;
1426         ssize_t ret;
1427         int saved_errno;
1428         char *conv;
1429
1430         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1431                                          &timestamp, &stripped)) {
1432                 return -1;
1433         }
1434         if (timestamp == 0) {
1435                 return SMB_VFS_NEXT_SETXATTR(handle, fname, aname, value, size,
1436                                              flags);
1437         }
1438         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1439         TALLOC_FREE(stripped);
1440         if (conv == NULL) {
1441                 return -1;
1442         }
1443         ret = SMB_VFS_NEXT_SETXATTR(handle, conv, aname, value, size, flags);
1444         saved_errno = errno;
1445         TALLOC_FREE(conv);
1446         errno = saved_errno;
1447         return ret;
1448 }
1449
1450 static int shadow_copy2_chmod_acl(vfs_handle_struct *handle,
1451                                   const char *fname, mode_t mode)
1452 {
1453         time_t timestamp;
1454         char *stripped;
1455         ssize_t ret;
1456         int saved_errno;
1457         char *conv;
1458
1459         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1460                                          &timestamp, &stripped)) {
1461                 return -1;
1462         }
1463         if (timestamp == 0) {
1464                 return SMB_VFS_NEXT_CHMOD_ACL(handle, fname, mode);
1465         }
1466         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1467         TALLOC_FREE(stripped);
1468         if (conv == NULL) {
1469                 return -1;
1470         }
1471         ret = SMB_VFS_NEXT_CHMOD_ACL(handle, conv, mode);
1472         saved_errno = errno;
1473         TALLOC_FREE(conv);
1474         errno = saved_errno;
1475         return ret;
1476 }
1477
1478 static int shadow_copy2_get_real_filename(struct vfs_handle_struct *handle,
1479                                           const char *path,
1480                                           const char *name,
1481                                           TALLOC_CTX *mem_ctx,
1482                                           char **found_name)
1483 {
1484         time_t timestamp;
1485         char *stripped;
1486         ssize_t ret;
1487         int saved_errno;
1488         char *conv;
1489
1490         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, path,
1491                                          &timestamp, &stripped)) {
1492                 return -1;
1493         }
1494         if (timestamp == 0) {
1495                 return SMB_VFS_NEXT_GET_REAL_FILENAME(handle, path, name,
1496                                                       mem_ctx, found_name);
1497         }
1498         if (stripped[0] == '\0') {
1499                 *found_name = talloc_strdup(mem_ctx, name);
1500                 if (*found_name == NULL) {
1501                         errno = ENOMEM;
1502                         return -1;
1503                 }
1504                 return 0;
1505         }
1506         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1507         TALLOC_FREE(stripped);
1508         if (conv == NULL) {
1509                 return -1;
1510         }
1511         ret = SMB_VFS_NEXT_GET_REAL_FILENAME(handle, conv, name,
1512                                              mem_ctx, found_name);
1513         saved_errno = errno;
1514         TALLOC_FREE(conv);
1515         errno = saved_errno;
1516         return ret;
1517 }
1518
1519
1520 static struct vfs_fn_pointers vfs_shadow_copy2_fns = {
1521         .opendir_fn = shadow_copy2_opendir,
1522         .rename_fn = shadow_copy2_rename,
1523         .link_fn = shadow_copy2_link,
1524         .symlink_fn = shadow_copy2_symlink,
1525         .stat_fn = shadow_copy2_stat,
1526         .lstat_fn = shadow_copy2_lstat,
1527         .fstat_fn = shadow_copy2_fstat,
1528         .open_fn = shadow_copy2_open,
1529         .unlink_fn = shadow_copy2_unlink,
1530         .chmod_fn = shadow_copy2_chmod,
1531         .chown_fn = shadow_copy2_chown,
1532         .chdir_fn = shadow_copy2_chdir,
1533         .ntimes_fn = shadow_copy2_ntimes,
1534         .readlink_fn = shadow_copy2_readlink,
1535         .mknod_fn = shadow_copy2_mknod,
1536         .realpath_fn = shadow_copy2_realpath,
1537         .get_nt_acl_fn = shadow_copy2_get_nt_acl,
1538         .fget_nt_acl_fn = shadow_copy2_fget_nt_acl,
1539         .get_shadow_copy_data_fn = shadow_copy2_get_shadow_copy_data,
1540         .mkdir_fn = shadow_copy2_mkdir,
1541         .rmdir_fn = shadow_copy2_rmdir,
1542         .getxattr_fn = shadow_copy2_getxattr,
1543         .listxattr_fn = shadow_copy2_listxattr,
1544         .removexattr_fn = shadow_copy2_removexattr,
1545         .setxattr_fn = shadow_copy2_setxattr,
1546         .chmod_acl_fn = shadow_copy2_chmod_acl,
1547         .chflags_fn = shadow_copy2_chflags,
1548         .get_real_filename_fn = shadow_copy2_get_real_filename,
1549 };
1550
1551 NTSTATUS vfs_shadow_copy2_init(void);
1552 NTSTATUS vfs_shadow_copy2_init(void)
1553 {
1554         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION,
1555                                 "shadow_copy2", &vfs_shadow_copy2_fns);
1556 }