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 /**
 967  * Check whether a given directory contains a
 968  * snapshot directory as direct subdirectory.
 969  * If yes, return the path of the snapshot-subdir,
 970  * otherwise return NULL.
 971  */
 972 static char *have_snapdir(struct vfs_handle_struct *handle,
 973                           const char *path)
 974 {
 975         struct smb_filename smb_fname;
 976         int ret;
 977
 978         ZERO_STRUCT(smb_fname);
 979         smb_fname.base_name = talloc_asprintf(
 980                 talloc_tos(), "%s/%s", path,
 981                 lp_parm_const_string(SNUM(handle->conn), "shadow", "snapdir",
 982                                      ".snapshots"));
 983         if (smb_fname.base_name == NULL) {
 984                 return NULL;
 985         }
 986
 987         ret = SMB_VFS_NEXT_STAT(handle, &smb_fname);
 988         if ((ret == 0) && (S_ISDIR(smb_fname.st.st_ex_mode))) {
 989                 return smb_fname.base_name;
 990         }
 991         TALLOC_FREE(smb_fname.base_name);
 992         return NULL;
 993 }
 994
 995 static char *shadow_copy2_find_snapdir(TALLOC_CTX *mem_ctx,
 996                                        struct vfs_handle_struct *handle,
 997                                        struct smb_filename *smb_fname)
 998 {
 999         char *path, *p;
1000         char *snapdir;
1001
1002         path = talloc_asprintf(mem_ctx, "%s/%s",
1003                                handle->conn->connectpath,
1004                                smb_fname->base_name);
1005         if (path == NULL) {
1006                 return NULL;
1007         }
1008
1009         snapdir = have_snapdir(handle, path);
1010         if (snapdir != NULL) {
1011                 TALLOC_FREE(path);
1012                 return snapdir;
1013         }
1014
1015         while ((p = strrchr(path, '/')) && (p > path)) {
1016
1017                 p[0] = '\0';
1018
1019                 snapdir = have_snapdir(handle, path);
1020                 if (snapdir != NULL) {
1021                         TALLOC_FREE(path);
1022                         return snapdir;
1023                 }
1024         }
1025         TALLOC_FREE(path);
1026         return NULL;
1027 }
1028
1029 static bool shadow_copy2_snapshot_to_gmt(vfs_handle_struct *handle,
1030                                          const char *name,
1031                                          char *gmt, size_t gmt_len)
1032 {
1033         struct tm timestamp;
1034         time_t timestamp_t;
1035         unsigned long int timestamp_long;
1036         const char *fmt;
1037
1038         fmt = lp_parm_const_string(SNUM(handle->conn), "shadow",
1039                                    "format", GMT_FORMAT);
1040
1041         ZERO_STRUCT(timestamp);
1042         if (lp_parm_bool(SNUM(handle->conn), "shadow", "sscanf", false)) {
1043                 if (sscanf(name, fmt, &timestamp_long) != 1) {
1044                         DEBUG(10, ("shadow_copy2_snapshot_to_gmt: "
1045                                    "no sscanf match %s: %s\n",
1046                                    fmt, name));
1047                         return false;
1048                 }
1049                 timestamp_t = timestamp_long;
1050                 gmtime_r(&timestamp_t, &timestamp);
1051         } else {
1052                 if (strptime(name, fmt, &timestamp) == NULL) {
1053                         DEBUG(10, ("shadow_copy2_snapshot_to_gmt: "
1054                                    "no match %s: %s\n",
1055                                    fmt, name));
1056                         return false;
1057                 }
1058                 DEBUG(10, ("shadow_copy2_snapshot_to_gmt: match %s: %s\n",
1059                            fmt, name));
1060
1061                 if (lp_parm_bool(SNUM(handle->conn), "shadow", "localtime", false)) {
1062                         timestamp.tm_isdst = -1;
1063                         timestamp_t = mktime(&timestamp);
1064                         gmtime_r(&timestamp_t, &timestamp);
1065                 }
1066         }
1067
1068         strftime(gmt, gmt_len, GMT_FORMAT, &timestamp);
1069         return true;
1070 }
1071
1072 static int shadow_copy2_label_cmp_asc(const void *x, const void *y)
1073 {
1074         return strncmp((const char *)x, (const char *)y, sizeof(SHADOW_COPY_LABEL));
1075 }
1076
1077 static int shadow_copy2_label_cmp_desc(const void *x, const void *y)
1078 {
1079         return -strncmp((const char *)x, (const char *)y, sizeof(SHADOW_COPY_LABEL));
1080 }
1081
1082 /*
1083   sort the shadow copy data in ascending or descending order
1084  */
1085 static void shadow_copy2_sort_data(vfs_handle_struct *handle,
1086                                    struct shadow_copy_data *shadow_copy2_data)
1087 {
1088         int (*cmpfunc)(const void *, const void *);
1089         const char *sort;
1090
1091         sort = lp_parm_const_string(SNUM(handle->conn), "shadow",
1092                                     "sort", "desc");
1093         if (sort == NULL) {
1094                 return;
1095         }
1096
1097         if (strcmp(sort, "asc") == 0) {
1098                 cmpfunc = shadow_copy2_label_cmp_asc;
1099         } else if (strcmp(sort, "desc") == 0) {
1100                 cmpfunc = shadow_copy2_label_cmp_desc;
1101         } else {
1102                 return;
1103         }
1104
1105         if (shadow_copy2_data && shadow_copy2_data->num_volumes > 0 &&
1106             shadow_copy2_data->labels)
1107         {
1108                 TYPESAFE_QSORT(shadow_copy2_data->labels,
1109                                shadow_copy2_data->num_volumes,
1110                                cmpfunc);
1111         }
1112 }
1113
1114 static int shadow_copy2_get_shadow_copy_data(
1115         vfs_handle_struct *handle, files_struct *fsp,
1116         struct shadow_copy_data *shadow_copy2_data,
1117         bool labels)
1118 {
1119         DIR *p;
1120         const char *snapdir;
1121         struct dirent *d;
1122         TALLOC_CTX *tmp_ctx = talloc_stackframe();
1123
1124         snapdir = shadow_copy2_find_snapdir(tmp_ctx, handle, fsp->fsp_name);
1125         if (snapdir == NULL) {
1126                 DEBUG(0,("shadow:snapdir not found for %s in get_shadow_copy_data\n",
1127                          handle->conn->connectpath));
1128                 errno = EINVAL;
1129                 talloc_free(tmp_ctx);
1130                 return -1;
1131         }
1132
1133         p = SMB_VFS_NEXT_OPENDIR(handle, snapdir, NULL, 0);
1134
1135         if (!p) {
1136                 DEBUG(2,("shadow_copy2: SMB_VFS_NEXT_OPENDIR() failed for '%s'"
1137                          " - %s\n", snapdir, strerror(errno)));
1138                 talloc_free(tmp_ctx);
1139                 errno = ENOSYS;
1140                 return -1;
1141         }
1142
1143         shadow_copy2_data->num_volumes = 0;
1144         shadow_copy2_data->labels      = NULL;
1145
1146         while ((d = SMB_VFS_NEXT_READDIR(handle, p, NULL))) {
1147                 char snapshot[GMT_NAME_LEN+1];
1148                 SHADOW_COPY_LABEL *tlabels;
1149
1150                 /*
1151                  * ignore names not of the right form in the snapshot
1152                  * directory
1153                  */
1154                 if (!shadow_copy2_snapshot_to_gmt(
1155                             handle, d->d_name,
1156                             snapshot, sizeof(snapshot))) {
1157
1158                         DEBUG(6, ("shadow_copy2_get_shadow_copy_data: "
1159                                   "ignoring %s\n", d->d_name));
1160                         continue;
1161                 }
1162                 DEBUG(6,("shadow_copy2_get_shadow_copy_data: %s -> %s\n",
1163                          d->d_name, snapshot));
1164
1165                 if (!labels) {
1166                         /* the caller doesn't want the labels */
1167                         shadow_copy2_data->num_volumes++;
1168                         continue;
1169                 }
1170
1171                 tlabels = talloc_realloc(shadow_copy2_data,
1172                                          shadow_copy2_data->labels,
1173                                          SHADOW_COPY_LABEL,
1174                                          shadow_copy2_data->num_volumes+1);
1175                 if (tlabels == NULL) {
1176                         DEBUG(0,("shadow_copy2: out of memory\n"));
1177                         SMB_VFS_NEXT_CLOSEDIR(handle, p);
1178                         talloc_free(tmp_ctx);
1179                         return -1;
1180                 }
1181
1182                 strlcpy(tlabels[shadow_copy2_data->num_volumes], snapshot,
1183                         sizeof(*tlabels));
1184
1185                 shadow_copy2_data->num_volumes++;
1186                 shadow_copy2_data->labels = tlabels;
1187         }
1188
1189         SMB_VFS_NEXT_CLOSEDIR(handle,p);
1190
1191         shadow_copy2_sort_data(handle, shadow_copy2_data);
1192
1193         talloc_free(tmp_ctx);
1194         return 0;
1195 }
1196
1197 static NTSTATUS shadow_copy2_fget_nt_acl(vfs_handle_struct *handle,
1198                                         struct files_struct *fsp,
1199                                         uint32 security_info,
1200                                          TALLOC_CTX *mem_ctx,
1201                                         struct security_descriptor **ppdesc)
1202 {
1203         time_t timestamp;
1204         char *stripped;
1205         NTSTATUS status;
1206         char *conv;
1207
1208         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1209                                          fsp->fsp_name->base_name,
1210                                          &timestamp, &stripped)) {
1211                 return map_nt_error_from_unix(errno);
1212         }
1213         if (timestamp == 0) {
1214                 return SMB_VFS_NEXT_FGET_NT_ACL(handle, fsp, security_info,
1215                                                 mem_ctx,
1216                                                 ppdesc);
1217         }
1218         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1219         TALLOC_FREE(stripped);
1220         if (conv == NULL) {
1221                 return map_nt_error_from_unix(errno);
1222         }
1223         status = SMB_VFS_NEXT_GET_NT_ACL(handle, conv, security_info,
1224                                          mem_ctx, ppdesc);
1225         TALLOC_FREE(conv);
1226         return status;
1227 }
1228
1229 static NTSTATUS shadow_copy2_get_nt_acl(vfs_handle_struct *handle,
1230                                         const char *fname,
1231                                         uint32 security_info,
1232                                         TALLOC_CTX *mem_ctx,
1233                                         struct security_descriptor **ppdesc)
1234 {
1235         time_t timestamp;
1236         char *stripped;
1237         NTSTATUS status;
1238         char *conv;
1239
1240         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1241                                          &timestamp, &stripped)) {
1242                 return map_nt_error_from_unix(errno);
1243         }
1244         if (timestamp == 0) {
1245                 return SMB_VFS_NEXT_GET_NT_ACL(handle, fname, security_info,
1246                                                mem_ctx, ppdesc);
1247         }
1248         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1249         TALLOC_FREE(stripped);
1250         if (conv == NULL) {
1251                 return map_nt_error_from_unix(errno);
1252         }
1253         status = SMB_VFS_NEXT_GET_NT_ACL(handle, conv, security_info,
1254                                          mem_ctx, ppdesc);
1255         TALLOC_FREE(conv);
1256         return status;
1257 }
1258
1259 static int shadow_copy2_mkdir(vfs_handle_struct *handle,
1260                               const char *fname, mode_t mode)
1261 {
1262         time_t timestamp;
1263         char *stripped;
1264         int ret, saved_errno;
1265         char *conv;
1266
1267         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1268                                          &timestamp, &stripped)) {
1269                 return -1;
1270         }
1271         if (timestamp == 0) {
1272                 return SMB_VFS_NEXT_MKDIR(handle, fname, mode);
1273         }
1274         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1275         TALLOC_FREE(stripped);
1276         if (conv == NULL) {
1277                 return -1;
1278         }
1279         ret = SMB_VFS_NEXT_MKDIR(handle, conv, mode);
1280         saved_errno = errno;
1281         TALLOC_FREE(conv);
1282         errno = saved_errno;
1283         return ret;
1284 }
1285
1286 static int shadow_copy2_rmdir(vfs_handle_struct *handle, const char *fname)
1287 {
1288         time_t timestamp;
1289         char *stripped;
1290         int ret, saved_errno;
1291         char *conv;
1292
1293         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1294                                          &timestamp, &stripped)) {
1295                 return -1;
1296         }
1297         if (timestamp == 0) {
1298                 return SMB_VFS_NEXT_RMDIR(handle, fname);
1299         }
1300         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1301         TALLOC_FREE(stripped);
1302         if (conv == NULL) {
1303                 return -1;
1304         }
1305         ret = SMB_VFS_NEXT_RMDIR(handle, conv);
1306         saved_errno = errno;
1307         TALLOC_FREE(conv);
1308         errno = saved_errno;
1309         return ret;
1310 }
1311
1312 static int shadow_copy2_chflags(vfs_handle_struct *handle, const char *fname,
1313                                 unsigned int flags)
1314 {
1315         time_t timestamp;
1316         char *stripped;
1317         int ret, saved_errno;
1318         char *conv;
1319
1320         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1321                                          &timestamp, &stripped)) {
1322                 return -1;
1323         }
1324         if (timestamp == 0) {
1325                 return SMB_VFS_NEXT_CHFLAGS(handle, fname, flags);
1326         }
1327         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1328         TALLOC_FREE(stripped);
1329         if (conv == NULL) {
1330                 return -1;
1331         }
1332         ret = SMB_VFS_NEXT_CHFLAGS(handle, conv, flags);
1333         saved_errno = errno;
1334         TALLOC_FREE(conv);
1335         errno = saved_errno;
1336         return ret;
1337 }
1338
1339 static ssize_t shadow_copy2_getxattr(vfs_handle_struct *handle,
1340                                      const char *fname, const char *aname,
1341                                      void *value, size_t size)
1342 {
1343         time_t timestamp;
1344         char *stripped;
1345         ssize_t ret;
1346         int saved_errno;
1347         char *conv;
1348
1349         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1350                                          &timestamp, &stripped)) {
1351                 return -1;
1352         }
1353         if (timestamp == 0) {
1354                 return SMB_VFS_NEXT_GETXATTR(handle, fname, aname, value,
1355                                              size);
1356         }
1357         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1358         TALLOC_FREE(stripped);
1359         if (conv == NULL) {
1360                 return -1;
1361         }
1362         ret = SMB_VFS_NEXT_GETXATTR(handle, conv, aname, value, size);
1363         saved_errno = errno;
1364         TALLOC_FREE(conv);
1365         errno = saved_errno;
1366         return ret;
1367 }
1368
1369 static ssize_t shadow_copy2_listxattr(struct vfs_handle_struct *handle,
1370                                       const char *fname,
1371                                       char *list, size_t size)
1372 {
1373         time_t timestamp;
1374         char *stripped;
1375         ssize_t ret;
1376         int saved_errno;
1377         char *conv;
1378
1379         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1380                                          &timestamp, &stripped)) {
1381                 return -1;
1382         }
1383         if (timestamp == 0) {
1384                 return SMB_VFS_NEXT_LISTXATTR(handle, fname, list, size);
1385         }
1386         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1387         TALLOC_FREE(stripped);
1388         if (conv == NULL) {
1389                 return -1;
1390         }
1391         ret = SMB_VFS_NEXT_LISTXATTR(handle, conv, list, size);
1392         saved_errno = errno;
1393         TALLOC_FREE(conv);
1394         errno = saved_errno;
1395         return ret;
1396 }
1397
1398 static int shadow_copy2_removexattr(vfs_handle_struct *handle,
1399                                     const char *fname, const char *aname)
1400 {
1401         time_t timestamp;
1402         char *stripped;
1403         int ret, saved_errno;
1404         char *conv;
1405
1406         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1407                                          &timestamp, &stripped)) {
1408                 return -1;
1409         }
1410         if (timestamp == 0) {
1411                 return SMB_VFS_NEXT_REMOVEXATTR(handle, fname, aname);
1412         }
1413         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1414         TALLOC_FREE(stripped);
1415         if (conv == NULL) {
1416                 return -1;
1417         }
1418         ret = SMB_VFS_NEXT_REMOVEXATTR(handle, conv, aname);
1419         saved_errno = errno;
1420         TALLOC_FREE(conv);
1421         errno = saved_errno;
1422         return ret;
1423 }
1424
1425 static int shadow_copy2_setxattr(struct vfs_handle_struct *handle,
1426                                  const char *fname,
1427                                  const char *aname, const void *value,
1428                                  size_t size, int flags)
1429 {
1430         time_t timestamp;
1431         char *stripped;
1432         ssize_t ret;
1433         int saved_errno;
1434         char *conv;
1435
1436         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1437                                          &timestamp, &stripped)) {
1438                 return -1;
1439         }
1440         if (timestamp == 0) {
1441                 return SMB_VFS_NEXT_SETXATTR(handle, fname, aname, value, size,
1442                                              flags);
1443         }
1444         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1445         TALLOC_FREE(stripped);
1446         if (conv == NULL) {
1447                 return -1;
1448         }
1449         ret = SMB_VFS_NEXT_SETXATTR(handle, conv, aname, value, size, flags);
1450         saved_errno = errno;
1451         TALLOC_FREE(conv);
1452         errno = saved_errno;
1453         return ret;
1454 }
1455
1456 static int shadow_copy2_chmod_acl(vfs_handle_struct *handle,
1457                                   const char *fname, mode_t mode)
1458 {
1459         time_t timestamp;
1460         char *stripped;
1461         ssize_t ret;
1462         int saved_errno;
1463         char *conv;
1464
1465         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1466                                          &timestamp, &stripped)) {
1467                 return -1;
1468         }
1469         if (timestamp == 0) {
1470                 return SMB_VFS_NEXT_CHMOD_ACL(handle, fname, mode);
1471         }
1472         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1473         TALLOC_FREE(stripped);
1474         if (conv == NULL) {
1475                 return -1;
1476         }
1477         ret = SMB_VFS_NEXT_CHMOD_ACL(handle, conv, mode);
1478         saved_errno = errno;
1479         TALLOC_FREE(conv);
1480         errno = saved_errno;
1481         return ret;
1482 }
1483
1484 static int shadow_copy2_get_real_filename(struct vfs_handle_struct *handle,
1485                                           const char *path,
1486                                           const char *name,
1487                                           TALLOC_CTX *mem_ctx,
1488                                           char **found_name)
1489 {
1490         time_t timestamp;
1491         char *stripped;
1492         ssize_t ret;
1493         int saved_errno;
1494         char *conv;
1495
1496         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, path,
1497                                          &timestamp, &stripped)) {
1498                 return -1;
1499         }
1500         if (timestamp == 0) {
1501                 return SMB_VFS_NEXT_GET_REAL_FILENAME(handle, path, name,
1502                                                       mem_ctx, found_name);
1503         }
1504         if (stripped[0] == '\0') {
1505                 *found_name = talloc_strdup(mem_ctx, name);
1506                 if (*found_name == NULL) {
1507                         errno = ENOMEM;
1508                         return -1;
1509                 }
1510                 return 0;
1511         }
1512         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1513         TALLOC_FREE(stripped);
1514         if (conv == NULL) {
1515                 return -1;
1516         }
1517         ret = SMB_VFS_NEXT_GET_REAL_FILENAME(handle, conv, name,
1518                                              mem_ctx, found_name);
1519         saved_errno = errno;
1520         TALLOC_FREE(conv);
1521         errno = saved_errno;
1522         return ret;
1523 }
1524
1525
1526 static struct vfs_fn_pointers vfs_shadow_copy2_fns = {
1527         .opendir_fn = shadow_copy2_opendir,
1528         .rename_fn = shadow_copy2_rename,
1529         .link_fn = shadow_copy2_link,
1530         .symlink_fn = shadow_copy2_symlink,
1531         .stat_fn = shadow_copy2_stat,
1532         .lstat_fn = shadow_copy2_lstat,
1533         .fstat_fn = shadow_copy2_fstat,
1534         .open_fn = shadow_copy2_open,
1535         .unlink_fn = shadow_copy2_unlink,
1536         .chmod_fn = shadow_copy2_chmod,
1537         .chown_fn = shadow_copy2_chown,
1538         .chdir_fn = shadow_copy2_chdir,
1539         .ntimes_fn = shadow_copy2_ntimes,
1540         .readlink_fn = shadow_copy2_readlink,
1541         .mknod_fn = shadow_copy2_mknod,
1542         .realpath_fn = shadow_copy2_realpath,
1543         .get_nt_acl_fn = shadow_copy2_get_nt_acl,
1544         .fget_nt_acl_fn = shadow_copy2_fget_nt_acl,
1545         .get_shadow_copy_data_fn = shadow_copy2_get_shadow_copy_data,
1546         .mkdir_fn = shadow_copy2_mkdir,
1547         .rmdir_fn = shadow_copy2_rmdir,
1548         .getxattr_fn = shadow_copy2_getxattr,
1549         .listxattr_fn = shadow_copy2_listxattr,
1550         .removexattr_fn = shadow_copy2_removexattr,
1551         .setxattr_fn = shadow_copy2_setxattr,
1552         .chmod_acl_fn = shadow_copy2_chmod_acl,
1553         .chflags_fn = shadow_copy2_chflags,
1554         .get_real_filename_fn = shadow_copy2_get_real_filename,
1555 };
1556
1557 NTSTATUS vfs_shadow_copy2_init(void);
1558 NTSTATUS vfs_shadow_copy2_init(void)
1559 {
1560         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION,
1561                                 "shadow_copy2", &vfs_shadow_copy2_fns);
1562 }