source3/modules/vfs_shadow_copy2.c

   1 /*
   2  * shadow_copy2: a shadow copy module (second implementation)
   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  * Copyright (C) Michael Adam      2013
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23  */
  24
  25 /*
  26  * This is a second implemetation of a shadow copy module for exposing
  27  * file system snapshots to windows clients as shadow copies.
  28  *
  29  * See the manual page for documentation.
  30  */
  31
  32 #include "includes.h"
  33 #include "smbd/smbd.h"
  34 #include "system/filesys.h"
  35 #include "include/ntioctl.h"
  36 #include "util_tdb.h"
  37
  38 struct shadow_copy2_config {
  39         char *gmt_format;
  40         bool use_sscanf;
  41         bool use_localtime;
  42         char *snapdir;
  43         bool snapdirseverywhere;
  44         bool crossmountpoints;
  45         bool fixinodes;
  46         char *sort_order;
  47         bool snapdir_absolute;
  48         char *mount_point;
  49         char *rel_connectpath; /* share root, relative to a snapshot root */
  50         char *snapshot_basepath; /* the absolute version of snapdir */
  51 };
  52
  53 static bool shadow_copy2_find_slashes(TALLOC_CTX *mem_ctx, const char *str,
  54                                       size_t **poffsets,
  55                                       unsigned *pnum_offsets)
  56 {
  57         unsigned num_offsets;
  58         size_t *offsets;
  59         const char *p;
  60
  61         num_offsets = 0;
  62
  63         p = str;
  64         while ((p = strchr(p, '/')) != NULL) {
  65                 num_offsets += 1;
  66                 p += 1;
  67         }
  68
  69         offsets = talloc_array(mem_ctx, size_t, num_offsets);
  70         if (offsets == NULL) {
  71                 return false;
  72         }
  73
  74         p = str;
  75         num_offsets = 0;
  76         while ((p = strchr(p, '/')) != NULL) {
  77                 offsets[num_offsets] = p-str;
  78                 num_offsets += 1;
  79                 p += 1;
  80         }
  81
  82         *poffsets = offsets;
  83         *pnum_offsets = num_offsets;
  84         return true;
  85 }
  86
  87 /**
  88  * Given a timestamp, build the posix level GMT-tag string
  89  * based on the configurable format.
  90  */
  91 static size_t shadow_copy2_posix_gmt_string(struct vfs_handle_struct *handle,
  92                                             time_t snapshot,
  93                                             char *snaptime_string,
  94                                             size_t len)
  95 {
  96         struct tm snap_tm;
  97         size_t snaptime_len;
  98         struct shadow_copy2_config *config;
  99
 100         SMB_VFS_HANDLE_GET_DATA(handle, config, struct shadow_copy2_config,
 101                                 return 0);
 102
 103         if (config->use_sscanf) {
 104                 snaptime_len = snprintf(snaptime_string,
 105                                         len,
 106                                         config->gmt_format,
 107                                         (unsigned long)snapshot);
 108                 if (snaptime_len <= 0) {
 109                         DEBUG(10, ("snprintf failed\n"));
 110                         return snaptime_len;
 111                 }
 112         } else {
 113                 if (config->use_localtime) {
 114                         if (localtime_r(&snapshot, &snap_tm) == 0) {
 115                                 DEBUG(10, ("gmtime_r failed\n"));
 116                                 return -1;
 117                         }
 118                 } else {
 119                         if (gmtime_r(&snapshot, &snap_tm) == 0) {
 120                                 DEBUG(10, ("gmtime_r failed\n"));
 121                                 return -1;
 122                         }
 123                 }
 124                 snaptime_len = strftime(snaptime_string,
 125                                         len,
 126                                         config->gmt_format,
 127                                         &snap_tm);
 128                 if (snaptime_len == 0) {
 129                         DEBUG(10, ("strftime failed\n"));
 130                         return 0;
 131                 }
 132         }
 133
 134         return snaptime_len;
 135 }
 136
 137 /**
 138  * Given a timestamp, build the string to insert into a path
 139  * as a path component for creating the local path to the
 140  * snapshot at the given timestamp of the input path.
 141  *
 142  * In the case of a parallel snapdir (specified with an
 143  * absolute path), this is the inital portion of the
 144  * local path of any snapshot file. The complete path is
 145  * obtained by appending the portion of the file's path
 146  * below the share root's mountpoint.
 147  */
 148 static char *shadow_copy2_insert_string(TALLOC_CTX *mem_ctx,
 149                                         struct vfs_handle_struct *handle,
 150                                         time_t snapshot)
 151 {
 152         fstring snaptime_string;
 153         size_t snaptime_len = 0;
 154         char *result = NULL;
 155         struct shadow_copy2_config *config;
 156
 157         SMB_VFS_HANDLE_GET_DATA(handle, config, struct shadow_copy2_config,
 158                                 return NULL);
 159
 160         snaptime_len = shadow_copy2_posix_gmt_string(handle,
 161                                                      snapshot,
 162                                                      snaptime_string,
 163                                                      sizeof(snaptime_string));
 164         if (snaptime_len <= 0) {
 165                 return NULL;
 166         }
 167
 168         if (config->snapdir_absolute) {
 169                 result = talloc_asprintf(mem_ctx, "%s/%s",
 170                                          config->snapdir, snaptime_string);
 171         } else {
 172                 result = talloc_asprintf(mem_ctx, "/%s/%s",
 173                                          config->snapdir, snaptime_string);
 174         }
 175         if (result == NULL) {
 176                 DEBUG(1, (__location__ " talloc_asprintf failed\n"));
 177         }
 178
 179         return result;
 180 }
 181
 182 /**
 183  * Build the posix snapshot path for the connection
 184  * at the given timestamp, i.e. the absolute posix path
 185  * that contains the snapshot for this file system.
 186  *
 187  * This only applies to classical case, i.e. not
 188  * to the "snapdirseverywhere" mode.
 189  */
 190 static char *shadow_copy2_snapshot_path(TALLOC_CTX *mem_ctx,
 191                                         struct vfs_handle_struct *handle,
 192                                         time_t snapshot)
 193 {
 194         fstring snaptime_string;
 195         size_t snaptime_len = 0;
 196         char *result = NULL;
 197         struct shadow_copy2_config *config;
 198
 199         SMB_VFS_HANDLE_GET_DATA(handle, config, struct shadow_copy2_config,
 200                                 return NULL);
 201
 202         snaptime_len = shadow_copy2_posix_gmt_string(handle,
 203                                                      snapshot,
 204                                                      snaptime_string,
 205                                                      sizeof(snaptime_string));
 206         if (snaptime_len <= 0) {
 207                 return NULL;
 208         }
 209
 210         result = talloc_asprintf(mem_ctx, "%s/%s",
 211                                  config->snapshot_basepath, snaptime_string);
 212         if (result == NULL) {
 213                 DEBUG(1, (__location__ " talloc_asprintf failed\n"));
 214         }
 215
 216         return result;
 217 }
 218
 219 /**
 220  * Strip a snapshot component from a filename as
 221  * handed in via the smb layer.
 222  * Returns the parsed timestamp and the stripped filename.
 223  */
 224 static bool shadow_copy2_strip_snapshot(TALLOC_CTX *mem_ctx,
 225                                         struct vfs_handle_struct *handle,
 226                                         const char *name,
 227                                         time_t *ptimestamp,
 228                                         char **pstripped)
 229 {
 230         struct tm tm;
 231         time_t timestamp;
 232         const char *p;
 233         char *q;
 234         char *stripped;
 235         size_t rest_len, dst_len;
 236         struct shadow_copy2_config *config;
 237         const char *snapdir;
 238         ssize_t snapdirlen;
 239         ptrdiff_t len_before_gmt;
 240
 241         SMB_VFS_HANDLE_GET_DATA(handle, config, struct shadow_copy2_config,
 242                                 return false);
 243
 244         DEBUG(10, (__location__ ": enter path '%s'\n", name));
 245
 246         p = strstr_m(name, "@GMT-");
 247         if (p == NULL) {
 248                 DEBUG(11, ("@GMT not found\n"));
 249                 goto no_snapshot;
 250         }
 251         if ((p > name) && (p[-1] != '/')) {
 252                 /* the GMT-token does not start a path-component */
 253                 DEBUG(10, ("not at start, p=%p, name=%p, p[-1]=%d\n",
 254                            p, name, (int)p[-1]));
 255                 goto no_snapshot;
 256         }
 257
 258         /*
 259          * Figure out whether we got an already converted string. One
 260          * case where this happens is in a smb2 create call with the
 261          * mxac create blob set. We do the get_acl call on
 262          * fsp->fsp_name, which is already converted. We are converted
 263          * if we got a file name of the form ".snapshots/@GMT-",
 264          * i.e. ".snapshots/" precedes "p".
 265          */
 266
 267         snapdir = lp_parm_const_string(SNUM(handle->conn), "shadow", "snapdir",
 268                                        ".snapshots");
 269         snapdirlen = strlen(snapdir);
 270         len_before_gmt = p - name;
 271
 272         if ((len_before_gmt >= (snapdirlen + 1)) && (p[-1] == '/')) {
 273                 const char *parent_snapdir = p - (snapdirlen+1);
 274
 275                 DEBUG(10, ("parent_snapdir = %s\n", parent_snapdir));
 276
 277                 if (strncmp(parent_snapdir, snapdir, snapdirlen) == 0) {
 278                         DEBUG(10, ("name=%s is already converted\n", name));
 279                         goto no_snapshot;
 280                 }
 281         }
 282         q = strptime(p, GMT_FORMAT, &tm);
 283         if (q == NULL) {
 284                 DEBUG(10, ("strptime failed\n"));
 285                 goto no_snapshot;
 286         }
 287         tm.tm_isdst = -1;
 288         timestamp = timegm(&tm);
 289         if (timestamp == (time_t)-1) {
 290                 DEBUG(10, ("timestamp==-1\n"));
 291                 goto no_snapshot;
 292         }
 293         if (q[0] == '\0') {
 294                 /*
 295                  * The name consists of only the GMT token or the GMT
 296                  * token is at the end of the path. XP seems to send
 297                  * @GMT- at the end under certain circumstances even
 298                  * with a path prefix.
 299                  */
 300                 if (pstripped != NULL) {
 301                         stripped = talloc_strndup(mem_ctx, name, p - name);
 302                         if (stripped == NULL) {
 303                                 return false;
 304                         }
 305                         *pstripped = stripped;
 306                 }
 307                 *ptimestamp = timestamp;
 308                 return true;
 309         }
 310         if (q[0] != '/') {
 311                 /*
 312                  * It is not a complete path component, i.e. the path
 313                  * component continues after the gmt-token.
 314                  */
 315                 DEBUG(10, ("q[0] = %d\n", (int)q[0]));
 316                 goto no_snapshot;
 317         }
 318         q += 1;
 319
 320         rest_len = strlen(q);
 321         dst_len = (p-name) + rest_len;
 322
 323         if (config->snapdirseverywhere) {
 324                 char *insert;
 325                 bool have_insert;
 326                 insert = shadow_copy2_insert_string(talloc_tos(), handle,
 327                                                     timestamp);
 328                 if (insert == NULL) {
 329                         errno = ENOMEM;
 330                         return false;
 331                 }
 332
 333                 DEBUG(10, (__location__ ": snapdirseverywhere mode.\n"
 334                            "path '%s'.\n"
 335                            "insert string '%s'\n", name, insert));
 336
 337                 have_insert = (strstr(name, insert+1) != NULL);
 338                 DEBUG(10, ("have_insert=%d, name=%s, insert+1=%s\n",
 339                            (int)have_insert, name, insert+1));
 340                 if (have_insert) {
 341                         DEBUG(10, (__location__ ": insert string '%s' found in "
 342                                    "path '%s' found in snapdirseverywhere mode "
 343                                    "==> already converted\n", insert, name));
 344                         TALLOC_FREE(insert);
 345                         goto no_snapshot;
 346                 }
 347                 TALLOC_FREE(insert);
 348         } else {
 349                 char *snapshot_path;
 350                 char *s;
 351
 352                 snapshot_path = shadow_copy2_snapshot_path(talloc_tos(),
 353                                                            handle,
 354                                                            timestamp);
 355                 if (snapshot_path == NULL) {
 356                         errno = ENOMEM;
 357                         return false;
 358                 }
 359
 360                 DEBUG(10, (__location__ " path: '%s'.\n"
 361                            "snapshot path: '%s'\n", name, snapshot_path));
 362
 363                 s = strstr(name, snapshot_path);
 364                 if (s == name) {
 365                         /*
 366                          * this starts with "snapshot_basepath/GMT-Token"
 367                          * so it is already a converted absolute
 368                          * path. Don't process further.
 369                          */
 370                         DEBUG(10, (__location__ ": path '%s' starts with "
 371                                    "snapshot path '%s' (not in "
 372                                    "snapdirseverywhere mode) ==> "
 373                                    "already converted\n", name, snapshot_path));
 374                         talloc_free(snapshot_path);
 375                         goto no_snapshot;
 376                 }
 377                 talloc_free(snapshot_path);
 378         }
 379
 380         if (pstripped != NULL) {
 381                 stripped = talloc_array(mem_ctx, char, dst_len+1);
 382                 if (stripped == NULL) {
 383                         errno = ENOMEM;
 384                         return false;
 385                 }
 386                 if (p > name) {
 387                         memcpy(stripped, name, p-name);
 388                 }
 389                 if (rest_len > 0) {
 390                         memcpy(stripped + (p-name), q, rest_len);
 391                 }
 392                 stripped[dst_len] = '\0';
 393                 *pstripped = stripped;
 394         }
 395         *ptimestamp = timestamp;
 396         return true;
 397 no_snapshot:
 398         *ptimestamp = 0;
 399         return true;
 400 }
 401
 402 static char *shadow_copy2_find_mount_point(TALLOC_CTX *mem_ctx,
 403                                            vfs_handle_struct *handle)
 404 {
 405         char *path = talloc_strdup(mem_ctx, handle->conn->connectpath);
 406         dev_t dev;
 407         struct stat st;
 408         char *p;
 409
 410         if (stat(path, &st) != 0) {
 411                 talloc_free(path);
 412                 return NULL;
 413         }
 414
 415         dev = st.st_dev;
 416
 417         while ((p = strrchr(path, '/')) && p > path) {
 418                 *p = 0;
 419                 if (stat(path, &st) != 0) {
 420                         talloc_free(path);
 421                         return NULL;
 422                 }
 423                 if (st.st_dev != dev) {
 424                         *p = '/';
 425                         break;
 426                 }
 427         }
 428
 429         return path;
 430 }
 431
 432 /**
 433  * Convert from a name as handed in via the SMB layer
 434  * and a timestamp into the local path of the snapshot
 435  * of the provided file at the provided time.
 436  * Also return the path in the snapshot corresponding
 437  * to the file's share root.
 438  */
 439 static char *shadow_copy2_do_convert(TALLOC_CTX *mem_ctx,
 440                                      struct vfs_handle_struct *handle,
 441                                      const char *name, time_t timestamp,
 442                                      size_t *snaproot_len)
 443 {
 444         struct smb_filename converted_fname;
 445         char *result = NULL;
 446         size_t *slashes = NULL;
 447         unsigned num_slashes;
 448         char *path = NULL;
 449         size_t pathlen;
 450         char *insert = NULL;
 451         char *converted = NULL;
 452         size_t insertlen, connectlen = 0;
 453         int i, saved_errno;
 454         size_t min_offset;
 455         struct shadow_copy2_config *config;
 456         size_t in_share_offset = 0;
 457
 458         SMB_VFS_HANDLE_GET_DATA(handle, config, struct shadow_copy2_config,
 459                                 return NULL);
 460
 461         DEBUG(10, ("converting '%s'\n", name));
 462
 463         if (!config->snapdirseverywhere) {
 464                 int ret;
 465                 char *snapshot_path;
 466
 467                 snapshot_path = shadow_copy2_snapshot_path(talloc_tos(),
 468                                                            handle,
 469                                                            timestamp);
 470                 if (snapshot_path == NULL) {
 471                         goto fail;
 472                 }
 473
 474                 if (config->rel_connectpath == NULL) {
 475                         converted = talloc_asprintf(mem_ctx, "%s/%s",
 476                                                     snapshot_path, name);
 477                 } else {
 478                         converted = talloc_asprintf(mem_ctx, "%s/%s/%s",
 479                                                     snapshot_path,
 480                                                     config->rel_connectpath,
 481                                                     name);
 482                 }
 483                 if (converted == NULL) {
 484                         goto fail;
 485                 }
 486
 487                 ZERO_STRUCT(converted_fname);
 488                 converted_fname.base_name = converted;
 489
 490                 ret = SMB_VFS_NEXT_LSTAT(handle, &converted_fname);
 491                 DEBUG(10, ("Trying[not snapdirseverywhere] %s: %d (%s)\n",
 492                            converted,
 493                            ret, ret == 0 ? "ok" : strerror(errno)));
 494                 if (ret == 0) {
 495                         DEBUG(10, ("Found %s\n", converted));
 496                         result = converted;
 497                         converted = NULL;
 498                         if (snaproot_len != NULL) {
 499                                 *snaproot_len = strlen(snapshot_path);
 500                                 if (config->rel_connectpath != NULL) {
 501                                         *snaproot_len +=
 502                                             strlen(config->rel_connectpath) + 1;
 503                                 }
 504                         }
 505                         goto fail;
 506                 } else {
 507                         errno = ENOENT;
 508                         goto fail;
 509                 }
 510                 /* never reached ... */
 511         }
 512
 513         connectlen = strlen(handle->conn->connectpath);
 514         if (name[0] == 0) {
 515                 path = talloc_strdup(mem_ctx, handle->conn->connectpath);
 516         } else {
 517                 path = talloc_asprintf(
 518                         mem_ctx, "%s/%s", handle->conn->connectpath, name);
 519         }
 520         if (path == NULL) {
 521                 errno = ENOMEM;
 522                 goto fail;
 523         }
 524         pathlen = talloc_get_size(path)-1;
 525
 526         if (!shadow_copy2_find_slashes(talloc_tos(), path,
 527                                        &slashes, &num_slashes)) {
 528                 goto fail;
 529         }
 530
 531         insert = shadow_copy2_insert_string(talloc_tos(), handle, timestamp);
 532         if (insert == NULL) {
 533                 goto fail;
 534         }
 535         insertlen = talloc_get_size(insert)-1;
 536
 537         /*
 538          * Note: We deliberatly don't expensively initialize the
 539          * array with talloc_zero here: Putting zero into
 540          * converted[pathlen+insertlen] below is sufficient, because
 541          * in the following for loop, the insert string is inserted
 542          * at various slash places. So the memory up to position
 543          * pathlen+insertlen will always be initialized when the
 544          * converted string is used.
 545          */
 546         converted = talloc_array(mem_ctx, char, pathlen + insertlen + 1);
 547         if (converted == NULL) {
 548                 goto fail;
 549         }
 550
 551         if (path[pathlen-1] != '/') {
 552                 /*
 553                  * Append a fake slash to find the snapshot root
 554                  */
 555                 size_t *tmp;
 556                 tmp = talloc_realloc(talloc_tos(), slashes,
 557                                      size_t, num_slashes+1);
 558                 if (tmp == NULL) {
 559                         goto fail;
 560                 }
 561                 slashes = tmp;
 562                 slashes[num_slashes] = pathlen;
 563                 num_slashes += 1;
 564         }
 565
 566         min_offset = 0;
 567
 568         if (!config->crossmountpoints) {
 569                 min_offset = strlen(config->mount_point);
 570         }
 571
 572         memcpy(converted, path, pathlen+1);
 573         converted[pathlen+insertlen] = '\0';
 574
 575         ZERO_STRUCT(converted_fname);
 576         converted_fname.base_name = converted;
 577
 578         for (i = num_slashes-1; i>=0; i--) {
 579                 int ret;
 580                 size_t offset;
 581
 582                 offset = slashes[i];
 583
 584                 if (offset < min_offset) {
 585                         errno = ENOENT;
 586                         goto fail;
 587                 }
 588
 589                 if (offset >= connectlen) {
 590                         in_share_offset = offset;
 591                 }
 592
 593                 memcpy(converted+offset, insert, insertlen);
 594
 595                 offset += insertlen;
 596                 memcpy(converted+offset, path + slashes[i],
 597                        pathlen - slashes[i]);
 598
 599                 ret = SMB_VFS_NEXT_LSTAT(handle, &converted_fname);
 600
 601                 DEBUG(10, ("Trying[snapdirseverywhere] %s: %d (%s)\n",
 602                            converted,
 603                            ret, ret == 0 ? "ok" : strerror(errno)));
 604                 if (ret == 0) {
 605                         /* success */
 606                         if (snaproot_len != NULL) {
 607                                 *snaproot_len = in_share_offset + insertlen;
 608                         }
 609                         break;
 610                 }
 611                 if (errno == ENOTDIR) {
 612                         /*
 613                          * This is a valid condition: We appended the
 614                          * .snaphots/@GMT.. to a file name. Just try
 615                          * with the upper levels.
 616                          */
 617                         continue;
 618                 }
 619                 if (errno != ENOENT) {
 620                         /* Other problem than "not found" */
 621                         goto fail;
 622                 }
 623         }
 624
 625         if (i >= 0) {
 626                 /*
 627                  * Found something
 628                  */
 629                 DEBUG(10, ("Found %s\n", converted));
 630                 result = converted;
 631                 converted = NULL;
 632         } else {
 633                 errno = ENOENT;
 634         }
 635 fail:
 636         saved_errno = errno;
 637         TALLOC_FREE(converted);
 638         TALLOC_FREE(insert);
 639         TALLOC_FREE(slashes);
 640         TALLOC_FREE(path);
 641         errno = saved_errno;
 642         return result;
 643 }
 644
 645 /**
 646  * Convert from a name as handed in via the SMB layer
 647  * and a timestamp into the local path of the snapshot
 648  * of the provided file at the provided time.
 649  */
 650 static char *shadow_copy2_convert(TALLOC_CTX *mem_ctx,
 651                                   struct vfs_handle_struct *handle,
 652                                   const char *name, time_t timestamp)
 653 {
 654         return shadow_copy2_do_convert(mem_ctx, handle, name, timestamp, NULL);
 655 }
 656
 657 /*
 658   modify a sbuf return to ensure that inodes in the shadow directory
 659   are different from those in the main directory
 660  */
 661 static void convert_sbuf(vfs_handle_struct *handle, const char *fname,
 662                          SMB_STRUCT_STAT *sbuf)
 663 {
 664         struct shadow_copy2_config *config;
 665
 666         SMB_VFS_HANDLE_GET_DATA(handle, config, struct shadow_copy2_config,
 667                                 return);
 668
 669         if (config->fixinodes) {
 670                 /* some snapshot systems, like GPFS, return the name
 671                    device:inode for the snapshot files as the current
 672                    files. That breaks the 'restore' button in the shadow copy
 673                    GUI, as the client gets a sharing violation.
 674
 675                    This is a crude way of allowing both files to be
 676                    open at once. It has a slight chance of inode
 677                    number collision, but I can't see a better approach
 678                    without significant VFS changes
 679                 */
 680                 TDB_DATA key = { .dptr = discard_const_p(uint8_t, fname),
 681                                  .dsize = strlen(fname) };
 682                 uint32_t shash;
 683
 684                 shash = tdb_jenkins_hash(&key) & 0xFF000000;
 685                 if (shash == 0) {
 686                         shash = 1;
 687                 }
 688                 sbuf->st_ex_ino ^= shash;
 689         }
 690 }
 691
 692 static DIR *shadow_copy2_opendir(vfs_handle_struct *handle,
 693                         const struct smb_filename *smb_fname,
 694                         const char *mask,
 695                         uint32_t attr)
 696 {
 697         time_t timestamp;
 698         char *stripped;
 699         DIR *ret;
 700         int saved_errno;
 701         char *conv;
 702         struct smb_filename *conv_smb_fname = NULL;
 703
 704         if (!shadow_copy2_strip_snapshot(talloc_tos(),
 705                                 handle,
 706                                 smb_fname->base_name,
 707                                 &timestamp,
 708                                 &stripped)) {
 709                 return NULL;
 710         }
 711         if (timestamp == 0) {
 712                 return SMB_VFS_NEXT_OPENDIR(handle, smb_fname, mask, attr);
 713         }
 714         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
 715         TALLOC_FREE(stripped);
 716         if (conv == NULL) {
 717                 return NULL;
 718         }
 719         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
 720                                         conv,
 721                                         NULL,
 722                                         NULL,
 723                                         smb_fname->flags);
 724         if (conv_smb_fname == NULL) {
 725                 TALLOC_FREE(conv);
 726                 return NULL;
 727         }
 728         ret = SMB_VFS_NEXT_OPENDIR(handle, conv_smb_fname, mask, attr);
 729         saved_errno = errno;
 730         TALLOC_FREE(conv);
 731         TALLOC_FREE(conv_smb_fname);
 732         errno = saved_errno;
 733         return ret;
 734 }
 735
 736 static int shadow_copy2_rename(vfs_handle_struct *handle,
 737                                const struct smb_filename *smb_fname_src,
 738                                const struct smb_filename *smb_fname_dst)
 739 {
 740         time_t timestamp_src, timestamp_dst;
 741
 742         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
 743                                          smb_fname_src->base_name,
 744                                          &timestamp_src, NULL)) {
 745                 return -1;
 746         }
 747         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
 748                                          smb_fname_dst->base_name,
 749                                          &timestamp_dst, NULL)) {
 750                 return -1;
 751         }
 752         if (timestamp_src != 0) {
 753                 errno = EXDEV;
 754                 return -1;
 755         }
 756         if (timestamp_dst != 0) {
 757                 errno = EROFS;
 758                 return -1;
 759         }
 760         return SMB_VFS_NEXT_RENAME(handle, smb_fname_src, smb_fname_dst);
 761 }
 762
 763 static int shadow_copy2_symlink(vfs_handle_struct *handle,
 764                                 const char *oldname, const char *newname)
 765 {
 766         time_t timestamp_old, timestamp_new;
 767
 768         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, oldname,
 769                                          &timestamp_old, NULL)) {
 770                 return -1;
 771         }
 772         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, newname,
 773                                          &timestamp_new, NULL)) {
 774                 return -1;
 775         }
 776         if ((timestamp_old != 0) || (timestamp_new != 0)) {
 777                 errno = EROFS;
 778                 return -1;
 779         }
 780         return SMB_VFS_NEXT_SYMLINK(handle, oldname, newname);
 781 }
 782
 783 static int shadow_copy2_link(vfs_handle_struct *handle,
 784                              const char *oldname, const char *newname)
 785 {
 786         time_t timestamp_old, timestamp_new;
 787
 788         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, oldname,
 789                                          &timestamp_old, NULL)) {
 790                 return -1;
 791         }
 792         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, newname,
 793                                          &timestamp_new, NULL)) {
 794                 return -1;
 795         }
 796         if ((timestamp_old != 0) || (timestamp_new != 0)) {
 797                 errno = EROFS;
 798                 return -1;
 799         }
 800         return SMB_VFS_NEXT_LINK(handle, oldname, newname);
 801 }
 802
 803 static int shadow_copy2_stat(vfs_handle_struct *handle,
 804                              struct smb_filename *smb_fname)
 805 {
 806         time_t timestamp;
 807         char *stripped, *tmp;
 808         int ret, saved_errno;
 809
 810         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
 811                                          smb_fname->base_name,
 812                                          &timestamp, &stripped)) {
 813                 return -1;
 814         }
 815         if (timestamp == 0) {
 816                 return SMB_VFS_NEXT_STAT(handle, smb_fname);
 817         }
 818
 819         tmp = smb_fname->base_name;
 820         smb_fname->base_name = shadow_copy2_convert(
 821                 talloc_tos(), handle, stripped, timestamp);
 822         TALLOC_FREE(stripped);
 823
 824         if (smb_fname->base_name == NULL) {
 825                 smb_fname->base_name = tmp;
 826                 return -1;
 827         }
 828
 829         ret = SMB_VFS_NEXT_STAT(handle, smb_fname);
 830         saved_errno = errno;
 831
 832         TALLOC_FREE(smb_fname->base_name);
 833         smb_fname->base_name = tmp;
 834
 835         if (ret == 0) {
 836                 convert_sbuf(handle, smb_fname->base_name, &smb_fname->st);
 837         }
 838         errno = saved_errno;
 839         return ret;
 840 }
 841
 842 static int shadow_copy2_lstat(vfs_handle_struct *handle,
 843                               struct smb_filename *smb_fname)
 844 {
 845         time_t timestamp;
 846         char *stripped, *tmp;
 847         int ret, saved_errno;
 848
 849         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
 850                                          smb_fname->base_name,
 851                                          &timestamp, &stripped)) {
 852                 return -1;
 853         }
 854         if (timestamp == 0) {
 855                 return SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 856         }
 857
 858         tmp = smb_fname->base_name;
 859         smb_fname->base_name = shadow_copy2_convert(
 860                 talloc_tos(), handle, stripped, timestamp);
 861         TALLOC_FREE(stripped);
 862
 863         if (smb_fname->base_name == NULL) {
 864                 smb_fname->base_name = tmp;
 865                 return -1;
 866         }
 867
 868         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 869         saved_errno = errno;
 870
 871         TALLOC_FREE(smb_fname->base_name);
 872         smb_fname->base_name = tmp;
 873
 874         if (ret == 0) {
 875                 convert_sbuf(handle, smb_fname->base_name, &smb_fname->st);
 876         }
 877         errno = saved_errno;
 878         return ret;
 879 }
 880
 881 static int shadow_copy2_fstat(vfs_handle_struct *handle, files_struct *fsp,
 882                               SMB_STRUCT_STAT *sbuf)
 883 {
 884         time_t timestamp;
 885         int ret;
 886
 887         ret = SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
 888         if (ret == -1) {
 889                 return ret;
 890         }
 891         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
 892                                          fsp->fsp_name->base_name,
 893                                          &timestamp, NULL)) {
 894                 return 0;
 895         }
 896         if (timestamp != 0) {
 897                 convert_sbuf(handle, fsp->fsp_name->base_name, sbuf);
 898         }
 899         return 0;
 900 }
 901
 902 static int shadow_copy2_open(vfs_handle_struct *handle,
 903                              struct smb_filename *smb_fname, files_struct *fsp,
 904                              int flags, mode_t mode)
 905 {
 906         time_t timestamp;
 907         char *stripped, *tmp;
 908         int ret, saved_errno;
 909
 910         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
 911                                          smb_fname->base_name,
 912                                          &timestamp, &stripped)) {
 913                 return -1;
 914         }
 915         if (timestamp == 0) {
 916                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 917         }
 918
 919         tmp = smb_fname->base_name;
 920         smb_fname->base_name = shadow_copy2_convert(
 921                 talloc_tos(), handle, stripped, timestamp);
 922         TALLOC_FREE(stripped);
 923
 924         if (smb_fname->base_name == NULL) {
 925                 smb_fname->base_name = tmp;
 926                 return -1;
 927         }
 928
 929         ret = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 930         saved_errno = errno;
 931
 932         TALLOC_FREE(smb_fname->base_name);
 933         smb_fname->base_name = tmp;
 934
 935         errno = saved_errno;
 936         return ret;
 937 }
 938
 939 static int shadow_copy2_unlink(vfs_handle_struct *handle,
 940                                const struct smb_filename *smb_fname)
 941 {
 942         time_t timestamp;
 943         char *stripped;
 944         int ret, saved_errno;
 945         struct smb_filename *conv;
 946
 947         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
 948                                          smb_fname->base_name,
 949                                          &timestamp, &stripped)) {
 950                 return -1;
 951         }
 952         if (timestamp == 0) {
 953                 return SMB_VFS_NEXT_UNLINK(handle, smb_fname);
 954         }
 955         conv = cp_smb_filename(talloc_tos(), smb_fname);
 956         if (conv == NULL) {
 957                 errno = ENOMEM;
 958                 return -1;
 959         }
 960         conv->base_name = shadow_copy2_convert(
 961                 conv, handle, stripped, timestamp);
 962         TALLOC_FREE(stripped);
 963         if (conv->base_name == NULL) {
 964                 return -1;
 965         }
 966         ret = SMB_VFS_NEXT_UNLINK(handle, conv);
 967         saved_errno = errno;
 968         TALLOC_FREE(conv);
 969         errno = saved_errno;
 970         return ret;
 971 }
 972
 973 static int shadow_copy2_chmod(vfs_handle_struct *handle,
 974                         const struct smb_filename *smb_fname,
 975                         mode_t mode)
 976 {
 977         time_t timestamp;
 978         char *stripped = NULL;
 979         int ret, saved_errno;
 980         char *conv = NULL;
 981         struct smb_filename *conv_smb_fname;
 982
 983         if (!shadow_copy2_strip_snapshot(talloc_tos(),
 984                                 handle,
 985                                 smb_fname->base_name,
 986                                 &timestamp,
 987                                 &stripped)) {
 988                 return -1;
 989         }
 990         if (timestamp == 0) {
 991                 TALLOC_FREE(stripped);
 992                 return SMB_VFS_NEXT_CHMOD(handle, smb_fname, mode);
 993         }
 994         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
 995         TALLOC_FREE(stripped);
 996         if (conv == NULL) {
 997                 return -1;
 998         }
 999         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
1000                                         conv,
1001                                         NULL,
1002                                         NULL,
1003                                         smb_fname->flags);
1004         if (conv_smb_fname == NULL) {
1005                 TALLOC_FREE(conv);
1006                 errno = ENOMEM;
1007                 return -1;
1008         }
1009
1010         ret = SMB_VFS_NEXT_CHMOD(handle, conv_smb_fname, mode);
1011         saved_errno = errno;
1012         TALLOC_FREE(conv);
1013         TALLOC_FREE(conv_smb_fname);
1014         errno = saved_errno;
1015         return ret;
1016 }
1017
1018 static int shadow_copy2_chown(vfs_handle_struct *handle,
1019                         const struct smb_filename *smb_fname,
1020                         uid_t uid,
1021                         gid_t gid)
1022 {
1023         time_t timestamp;
1024         char *stripped;
1025         int ret, saved_errno;
1026         char *conv = NULL;
1027         struct smb_filename *conv_smb_fname = NULL;
1028
1029         if (!shadow_copy2_strip_snapshot(talloc_tos(),
1030                                 handle,
1031                                 smb_fname->base_name,
1032                                 &timestamp,
1033                                 &stripped)) {
1034                 return -1;
1035         }
1036         if (timestamp == 0) {
1037                 return SMB_VFS_NEXT_CHOWN(handle, smb_fname, uid, gid);
1038         }
1039         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1040         TALLOC_FREE(stripped);
1041         if (conv == NULL) {
1042                 return -1;
1043         }
1044         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
1045                                         conv,
1046                                         NULL,
1047                                         NULL,
1048                                         smb_fname->flags);
1049         if (conv_smb_fname == NULL) {
1050                 TALLOC_FREE(conv);
1051                 errno = ENOMEM;
1052                 return -1;
1053         }
1054         ret = SMB_VFS_NEXT_CHOWN(handle, conv_smb_fname, uid, gid);
1055         saved_errno = errno;
1056         TALLOC_FREE(conv);
1057         TALLOC_FREE(conv_smb_fname);
1058         errno = saved_errno;
1059         return ret;
1060 }
1061
1062 static int shadow_copy2_chdir(vfs_handle_struct *handle,
1063                               const char *fname)
1064 {
1065         time_t timestamp;
1066         char *stripped;
1067         int ret, saved_errno;
1068         char *conv;
1069
1070         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1071                                          &timestamp, &stripped)) {
1072                 return -1;
1073         }
1074         if (timestamp == 0) {
1075                 return SMB_VFS_NEXT_CHDIR(handle, fname);
1076         }
1077         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1078         TALLOC_FREE(stripped);
1079         if (conv == NULL) {
1080                 return -1;
1081         }
1082         ret = SMB_VFS_NEXT_CHDIR(handle, conv);
1083         saved_errno = errno;
1084         TALLOC_FREE(conv);
1085         errno = saved_errno;
1086         return ret;
1087 }
1088
1089 static int shadow_copy2_ntimes(vfs_handle_struct *handle,
1090                                const struct smb_filename *smb_fname,
1091                                struct smb_file_time *ft)
1092 {
1093         time_t timestamp;
1094         char *stripped;
1095         int ret, saved_errno;
1096         struct smb_filename *conv;
1097
1098         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1099                                          smb_fname->base_name,
1100                                          &timestamp, &stripped)) {
1101                 return -1;
1102         }
1103         if (timestamp == 0) {
1104                 return SMB_VFS_NEXT_NTIMES(handle, smb_fname, ft);
1105         }
1106         conv = cp_smb_filename(talloc_tos(), smb_fname);
1107         if (conv == NULL) {
1108                 errno = ENOMEM;
1109                 return -1;
1110         }
1111         conv->base_name = shadow_copy2_convert(
1112                 conv, handle, stripped, timestamp);
1113         TALLOC_FREE(stripped);
1114         if (conv->base_name == NULL) {
1115                 return -1;
1116         }
1117         ret = SMB_VFS_NEXT_NTIMES(handle, conv, ft);
1118         saved_errno = errno;
1119         TALLOC_FREE(conv);
1120         errno = saved_errno;
1121         return ret;
1122 }
1123
1124 static int shadow_copy2_readlink(vfs_handle_struct *handle,
1125                                  const char *fname, char *buf, size_t bufsiz)
1126 {
1127         time_t timestamp;
1128         char *stripped;
1129         int ret, saved_errno;
1130         char *conv;
1131
1132         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1133                                          &timestamp, &stripped)) {
1134                 return -1;
1135         }
1136         if (timestamp == 0) {
1137                 return SMB_VFS_NEXT_READLINK(handle, fname, buf, bufsiz);
1138         }
1139         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1140         TALLOC_FREE(stripped);
1141         if (conv == NULL) {
1142                 return -1;
1143         }
1144         ret = SMB_VFS_NEXT_READLINK(handle, conv, buf, bufsiz);
1145         saved_errno = errno;
1146         TALLOC_FREE(conv);
1147         errno = saved_errno;
1148         return ret;
1149 }
1150
1151 static int shadow_copy2_mknod(vfs_handle_struct *handle,
1152                               const char *fname, mode_t mode, SMB_DEV_T dev)
1153 {
1154         time_t timestamp;
1155         char *stripped;
1156         int ret, saved_errno;
1157         char *conv;
1158
1159         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1160                                          &timestamp, &stripped)) {
1161                 return -1;
1162         }
1163         if (timestamp == 0) {
1164                 return SMB_VFS_NEXT_MKNOD(handle, fname, mode, dev);
1165         }
1166         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1167         TALLOC_FREE(stripped);
1168         if (conv == NULL) {
1169                 return -1;
1170         }
1171         ret = SMB_VFS_NEXT_MKNOD(handle, conv, mode, dev);
1172         saved_errno = errno;
1173         TALLOC_FREE(conv);
1174         errno = saved_errno;
1175         return ret;
1176 }
1177
1178 static char *shadow_copy2_realpath(vfs_handle_struct *handle,
1179                                    const char *fname)
1180 {
1181         time_t timestamp;
1182         char *stripped = NULL;
1183         char *tmp = NULL;
1184         char *result = NULL;
1185         int saved_errno;
1186
1187         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1188                                          &timestamp, &stripped)) {
1189                 goto done;
1190         }
1191         if (timestamp == 0) {
1192                 return SMB_VFS_NEXT_REALPATH(handle, fname);
1193         }
1194
1195         tmp = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1196         if (tmp == NULL) {
1197                 goto done;
1198         }
1199
1200         result = SMB_VFS_NEXT_REALPATH(handle, tmp);
1201
1202 done:
1203         saved_errno = errno;
1204         TALLOC_FREE(tmp);
1205         TALLOC_FREE(stripped);
1206         errno = saved_errno;
1207         return result;
1208 }
1209
1210 /**
1211  * Check whether a given directory contains a
1212  * snapshot directory as direct subdirectory.
1213  * If yes, return the path of the snapshot-subdir,
1214  * otherwise return NULL.
1215  */
1216 static char *have_snapdir(struct vfs_handle_struct *handle,
1217                           const char *path)
1218 {
1219         struct smb_filename smb_fname;
1220         int ret;
1221         struct shadow_copy2_config *config;
1222
1223         SMB_VFS_HANDLE_GET_DATA(handle, config, struct shadow_copy2_config,
1224                                 return NULL);
1225
1226         ZERO_STRUCT(smb_fname);
1227         smb_fname.base_name = talloc_asprintf(talloc_tos(), "%s/%s",
1228                                               path, config->snapdir);
1229         if (smb_fname.base_name == NULL) {
1230                 return NULL;
1231         }
1232
1233         ret = SMB_VFS_NEXT_STAT(handle, &smb_fname);
1234         if ((ret == 0) && (S_ISDIR(smb_fname.st.st_ex_mode))) {
1235                 return smb_fname.base_name;
1236         }
1237         TALLOC_FREE(smb_fname.base_name);
1238         return NULL;
1239 }
1240
1241 static bool check_access_snapdir(struct vfs_handle_struct *handle,
1242                                 const char *path)
1243 {
1244         struct smb_filename smb_fname;
1245         int ret;
1246         NTSTATUS status;
1247
1248         ZERO_STRUCT(smb_fname);
1249         smb_fname.base_name = talloc_asprintf(talloc_tos(),
1250                                                 "%s",
1251                                                 path);
1252         if (smb_fname.base_name == NULL) {
1253                 return false;
1254         }
1255
1256         ret = SMB_VFS_NEXT_STAT(handle, &smb_fname);
1257         if (ret != 0 || !S_ISDIR(smb_fname.st.st_ex_mode)) {
1258                 TALLOC_FREE(smb_fname.base_name);
1259                 return false;
1260         }
1261
1262         status = smbd_check_access_rights(handle->conn,
1263                                         &smb_fname,
1264                                         false,
1265                                         SEC_DIR_LIST);
1266         if (!NT_STATUS_IS_OK(status)) {
1267                 DEBUG(0,("user does not have list permission "
1268                         "on snapdir %s\n",
1269                         smb_fname.base_name));
1270                 TALLOC_FREE(smb_fname.base_name);
1271                 return false;
1272         }
1273         TALLOC_FREE(smb_fname.base_name);
1274         return true;
1275 }
1276
1277 /**
1278  * Find the snapshot directory (if any) for the given
1279  * filename (which is relative to the share).
1280  */
1281 static const char *shadow_copy2_find_snapdir(TALLOC_CTX *mem_ctx,
1282                                              struct vfs_handle_struct *handle,
1283                                              struct smb_filename *smb_fname)
1284 {
1285         char *path, *p;
1286         const char *snapdir;
1287         struct shadow_copy2_config *config;
1288
1289         SMB_VFS_HANDLE_GET_DATA(handle, config, struct shadow_copy2_config,
1290                                 return NULL);
1291
1292         /*
1293          * If the non-snapdisrseverywhere mode, we should not search!
1294          */
1295         if (!config->snapdirseverywhere) {
1296                 return config->snapshot_basepath;
1297         }
1298
1299         path = talloc_asprintf(mem_ctx, "%s/%s",
1300                                handle->conn->connectpath,
1301                                smb_fname->base_name);
1302         if (path == NULL) {
1303                 return NULL;
1304         }
1305
1306         snapdir = have_snapdir(handle, path);
1307         if (snapdir != NULL) {
1308                 TALLOC_FREE(path);
1309                 return snapdir;
1310         }
1311
1312         while ((p = strrchr(path, '/')) && (p > path)) {
1313
1314                 p[0] = '\0';
1315
1316                 snapdir = have_snapdir(handle, path);
1317                 if (snapdir != NULL) {
1318                         TALLOC_FREE(path);
1319                         return snapdir;
1320                 }
1321         }
1322         TALLOC_FREE(path);
1323         return NULL;
1324 }
1325
1326 static bool shadow_copy2_snapshot_to_gmt(vfs_handle_struct *handle,
1327                                          const char *name,
1328                                          char *gmt, size_t gmt_len)
1329 {
1330         struct tm timestamp;
1331         time_t timestamp_t;
1332         unsigned long int timestamp_long;
1333         const char *fmt;
1334         struct shadow_copy2_config *config;
1335
1336         SMB_VFS_HANDLE_GET_DATA(handle, config, struct shadow_copy2_config,
1337                                 return NULL);
1338
1339         fmt = config->gmt_format;
1340
1341         ZERO_STRUCT(timestamp);
1342         if (config->use_sscanf) {
1343                 if (sscanf(name, fmt, &timestamp_long) != 1) {
1344                         DEBUG(10, ("shadow_copy2_snapshot_to_gmt: "
1345                                    "no sscanf match %s: %s\n",
1346                                    fmt, name));
1347                         return false;
1348                 }
1349                 timestamp_t = timestamp_long;
1350                 gmtime_r(&timestamp_t, &timestamp);
1351         } else {
1352                 if (strptime(name, fmt, &timestamp) == NULL) {
1353                         DEBUG(10, ("shadow_copy2_snapshot_to_gmt: "
1354                                    "no match %s: %s\n",
1355                                    fmt, name));
1356                         return false;
1357                 }
1358                 DEBUG(10, ("shadow_copy2_snapshot_to_gmt: match %s: %s\n",
1359                            fmt, name));
1360
1361                 if (config->use_localtime) {
1362                         timestamp.tm_isdst = -1;
1363                         timestamp_t = mktime(&timestamp);
1364                         gmtime_r(&timestamp_t, &timestamp);
1365                 }
1366         }
1367
1368         strftime(gmt, gmt_len, GMT_FORMAT, &timestamp);
1369         return true;
1370 }
1371
1372 static int shadow_copy2_label_cmp_asc(const void *x, const void *y)
1373 {
1374         return strncmp((const char *)x, (const char *)y, sizeof(SHADOW_COPY_LABEL));
1375 }
1376
1377 static int shadow_copy2_label_cmp_desc(const void *x, const void *y)
1378 {
1379         return -strncmp((const char *)x, (const char *)y, sizeof(SHADOW_COPY_LABEL));
1380 }
1381
1382 /*
1383   sort the shadow copy data in ascending or descending order
1384  */
1385 static void shadow_copy2_sort_data(vfs_handle_struct *handle,
1386                                    struct shadow_copy_data *shadow_copy2_data)
1387 {
1388         int (*cmpfunc)(const void *, const void *);
1389         const char *sort;
1390         struct shadow_copy2_config *config;
1391
1392         SMB_VFS_HANDLE_GET_DATA(handle, config, struct shadow_copy2_config,
1393                                 return);
1394
1395         sort = config->sort_order;
1396         if (sort == NULL) {
1397                 return;
1398         }
1399
1400         if (strcmp(sort, "asc") == 0) {
1401                 cmpfunc = shadow_copy2_label_cmp_asc;
1402         } else if (strcmp(sort, "desc") == 0) {
1403                 cmpfunc = shadow_copy2_label_cmp_desc;
1404         } else {
1405                 return;
1406         }
1407
1408         if (shadow_copy2_data && shadow_copy2_data->num_volumes > 0 &&
1409             shadow_copy2_data->labels)
1410         {
1411                 TYPESAFE_QSORT(shadow_copy2_data->labels,
1412                                shadow_copy2_data->num_volumes,
1413                                cmpfunc);
1414         }
1415 }
1416
1417 static int shadow_copy2_get_shadow_copy_data(
1418         vfs_handle_struct *handle, files_struct *fsp,
1419         struct shadow_copy_data *shadow_copy2_data,
1420         bool labels)
1421 {
1422         DIR *p;
1423         const char *snapdir;
1424         struct smb_filename *snapdir_smb_fname = NULL;
1425         struct dirent *d;
1426         TALLOC_CTX *tmp_ctx = talloc_stackframe();
1427         bool ret;
1428
1429         snapdir = shadow_copy2_find_snapdir(tmp_ctx, handle, fsp->fsp_name);
1430         if (snapdir == NULL) {
1431                 DEBUG(0,("shadow:snapdir not found for %s in get_shadow_copy_data\n",
1432                          handle->conn->connectpath));
1433                 errno = EINVAL;
1434                 talloc_free(tmp_ctx);
1435                 return -1;
1436         }
1437         ret = check_access_snapdir(handle, snapdir);
1438         if (!ret) {
1439                 DEBUG(0,("access denied on listing snapdir %s\n", snapdir));
1440                 errno = EACCES;
1441                 talloc_free(tmp_ctx);
1442                 return -1;
1443         }
1444
1445         snapdir_smb_fname = synthetic_smb_fname(talloc_tos(),
1446                                         snapdir,
1447                                         NULL,
1448                                         NULL,
1449                                         fsp->fsp_name->flags);
1450         if (snapdir_smb_fname == NULL) {
1451                 errno = ENOMEM;
1452                 talloc_free(tmp_ctx);
1453                 return -1;
1454         }
1455
1456         p = SMB_VFS_NEXT_OPENDIR(handle, snapdir_smb_fname, NULL, 0);
1457
1458         if (!p) {
1459                 DEBUG(2,("shadow_copy2: SMB_VFS_NEXT_OPENDIR() failed for '%s'"
1460                          " - %s\n", snapdir, strerror(errno)));
1461                 talloc_free(tmp_ctx);
1462                 errno = ENOSYS;
1463                 return -1;
1464         }
1465
1466         shadow_copy2_data->num_volumes = 0;
1467         shadow_copy2_data->labels      = NULL;
1468
1469         while ((d = SMB_VFS_NEXT_READDIR(handle, p, NULL))) {
1470                 char snapshot[GMT_NAME_LEN+1];
1471                 SHADOW_COPY_LABEL *tlabels;
1472
1473                 /*
1474                  * ignore names not of the right form in the snapshot
1475                  * directory
1476                  */
1477                 if (!shadow_copy2_snapshot_to_gmt(
1478                             handle, d->d_name,
1479                             snapshot, sizeof(snapshot))) {
1480
1481                         DEBUG(6, ("shadow_copy2_get_shadow_copy_data: "
1482                                   "ignoring %s\n", d->d_name));
1483                         continue;
1484                 }
1485                 DEBUG(6,("shadow_copy2_get_shadow_copy_data: %s -> %s\n",
1486                          d->d_name, snapshot));
1487
1488                 if (!labels) {
1489                         /* the caller doesn't want the labels */
1490                         shadow_copy2_data->num_volumes++;
1491                         continue;
1492                 }
1493
1494                 tlabels = talloc_realloc(shadow_copy2_data,
1495                                          shadow_copy2_data->labels,
1496                                          SHADOW_COPY_LABEL,
1497                                          shadow_copy2_data->num_volumes+1);
1498                 if (tlabels == NULL) {
1499                         DEBUG(0,("shadow_copy2: out of memory\n"));
1500                         SMB_VFS_NEXT_CLOSEDIR(handle, p);
1501                         talloc_free(tmp_ctx);
1502                         return -1;
1503                 }
1504
1505                 strlcpy(tlabels[shadow_copy2_data->num_volumes], snapshot,
1506                         sizeof(*tlabels));
1507
1508                 shadow_copy2_data->num_volumes++;
1509                 shadow_copy2_data->labels = tlabels;
1510         }
1511
1512         SMB_VFS_NEXT_CLOSEDIR(handle,p);
1513
1514         shadow_copy2_sort_data(handle, shadow_copy2_data);
1515
1516         talloc_free(tmp_ctx);
1517         return 0;
1518 }
1519
1520 static NTSTATUS shadow_copy2_fget_nt_acl(vfs_handle_struct *handle,
1521                                         struct files_struct *fsp,
1522                                         uint32_t security_info,
1523                                          TALLOC_CTX *mem_ctx,
1524                                         struct security_descriptor **ppdesc)
1525 {
1526         time_t timestamp;
1527         char *stripped;
1528         NTSTATUS status;
1529         char *conv;
1530         struct smb_filename *smb_fname = NULL;
1531
1532         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1533                                          fsp->fsp_name->base_name,
1534                                          &timestamp, &stripped)) {
1535                 return map_nt_error_from_unix(errno);
1536         }
1537         if (timestamp == 0) {
1538                 return SMB_VFS_NEXT_FGET_NT_ACL(handle, fsp, security_info,
1539                                                 mem_ctx,
1540                                                 ppdesc);
1541         }
1542         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1543         TALLOC_FREE(stripped);
1544         if (conv == NULL) {
1545                 return map_nt_error_from_unix(errno);
1546         }
1547         smb_fname = synthetic_smb_fname(talloc_tos(),
1548                                         conv,
1549                                         NULL,
1550                                         NULL,
1551                                         fsp->fsp_name->flags);
1552         if (smb_fname == NULL) {
1553                 TALLOC_FREE(conv);
1554                 return NT_STATUS_NO_MEMORY;
1555         }
1556
1557         status = SMB_VFS_NEXT_GET_NT_ACL(handle, smb_fname, security_info,
1558                                          mem_ctx, ppdesc);
1559         TALLOC_FREE(conv);
1560         TALLOC_FREE(smb_fname);
1561         return status;
1562 }
1563
1564 static NTSTATUS shadow_copy2_get_nt_acl(vfs_handle_struct *handle,
1565                                         const struct smb_filename *smb_fname,
1566                                         uint32_t security_info,
1567                                         TALLOC_CTX *mem_ctx,
1568                                         struct security_descriptor **ppdesc)
1569 {
1570         time_t timestamp;
1571         char *stripped;
1572         NTSTATUS status;
1573         char *conv;
1574         struct smb_filename *conv_smb_fname = NULL;
1575
1576         if (!shadow_copy2_strip_snapshot(talloc_tos(),
1577                                         handle,
1578                                         smb_fname->base_name,
1579                                         &timestamp,
1580                                         &stripped)) {
1581                 return map_nt_error_from_unix(errno);
1582         }
1583         if (timestamp == 0) {
1584                 return SMB_VFS_NEXT_GET_NT_ACL(handle, smb_fname, security_info,
1585                                                mem_ctx, ppdesc);
1586         }
1587         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1588         TALLOC_FREE(stripped);
1589         if (conv == NULL) {
1590                 return map_nt_error_from_unix(errno);
1591         }
1592         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
1593                                         conv,
1594                                         NULL,
1595                                         NULL,
1596                                         smb_fname->flags);
1597         if (conv_smb_fname == NULL) {
1598                 TALLOC_FREE(conv);
1599                 return NT_STATUS_NO_MEMORY;
1600         }
1601         status = SMB_VFS_NEXT_GET_NT_ACL(handle, conv_smb_fname, security_info,
1602                                          mem_ctx, ppdesc);
1603         TALLOC_FREE(conv);
1604         TALLOC_FREE(conv_smb_fname);
1605         return status;
1606 }
1607
1608 static int shadow_copy2_mkdir(vfs_handle_struct *handle,
1609                                 const struct smb_filename *smb_fname,
1610                                 mode_t mode)
1611 {
1612         time_t timestamp;
1613         char *stripped;
1614         int ret, saved_errno;
1615         char *conv;
1616         struct smb_filename *conv_smb_fname = NULL;
1617
1618         if (!shadow_copy2_strip_snapshot(talloc_tos(),
1619                                         handle,
1620                                         smb_fname->base_name,
1621                                         &timestamp,
1622                                         &stripped)) {
1623                 return -1;
1624         }
1625         if (timestamp == 0) {
1626                 return SMB_VFS_NEXT_MKDIR(handle, smb_fname, mode);
1627         }
1628         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1629         TALLOC_FREE(stripped);
1630         if (conv == NULL) {
1631                 return -1;
1632         }
1633         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
1634                                         conv,
1635                                         NULL,
1636                                         NULL,
1637                                         smb_fname->flags);
1638         if (conv_smb_fname == NULL) {
1639                 TALLOC_FREE(conv);
1640                 return -1;
1641         }
1642         ret = SMB_VFS_NEXT_MKDIR(handle, conv_smb_fname, mode);
1643         saved_errno = errno;
1644         TALLOC_FREE(conv);
1645         TALLOC_FREE(conv_smb_fname);
1646         errno = saved_errno;
1647         return ret;
1648 }
1649
1650 static int shadow_copy2_rmdir(vfs_handle_struct *handle,
1651                                 const struct smb_filename *smb_fname)
1652 {
1653         time_t timestamp;
1654         char *stripped;
1655         int ret, saved_errno;
1656         char *conv;
1657         struct smb_filename *conv_smb_fname = NULL;
1658
1659         if (!shadow_copy2_strip_snapshot(talloc_tos(),
1660                                         handle,
1661                                         smb_fname->base_name,
1662                                         &timestamp,
1663                                         &stripped)) {
1664                 return -1;
1665         }
1666         if (timestamp == 0) {
1667                 return SMB_VFS_NEXT_RMDIR(handle, smb_fname);
1668         }
1669         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1670         TALLOC_FREE(stripped);
1671         if (conv == NULL) {
1672                 return -1;
1673         }
1674         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
1675                                         conv,
1676                                         NULL,
1677                                         NULL,
1678                                         smb_fname->flags);
1679         if (conv_smb_fname == NULL) {
1680                 TALLOC_FREE(conv);
1681                 return -1;
1682         }
1683         ret = SMB_VFS_NEXT_RMDIR(handle, conv_smb_fname);
1684         saved_errno = errno;
1685         TALLOC_FREE(conv_smb_fname);
1686         TALLOC_FREE(conv);
1687         errno = saved_errno;
1688         return ret;
1689 }
1690
1691 static int shadow_copy2_chflags(vfs_handle_struct *handle, const char *fname,
1692                                 unsigned int flags)
1693 {
1694         time_t timestamp;
1695         char *stripped;
1696         int ret, saved_errno;
1697         char *conv;
1698
1699         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1700                                          &timestamp, &stripped)) {
1701                 return -1;
1702         }
1703         if (timestamp == 0) {
1704                 return SMB_VFS_NEXT_CHFLAGS(handle, fname, flags);
1705         }
1706         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1707         TALLOC_FREE(stripped);
1708         if (conv == NULL) {
1709                 return -1;
1710         }
1711         ret = SMB_VFS_NEXT_CHFLAGS(handle, conv, flags);
1712         saved_errno = errno;
1713         TALLOC_FREE(conv);
1714         errno = saved_errno;
1715         return ret;
1716 }
1717
1718 static ssize_t shadow_copy2_getxattr(vfs_handle_struct *handle,
1719                                      const char *fname, const char *aname,
1720                                      void *value, size_t size)
1721 {
1722         time_t timestamp;
1723         char *stripped;
1724         ssize_t ret;
1725         int saved_errno;
1726         char *conv;
1727
1728         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1729                                          &timestamp, &stripped)) {
1730                 return -1;
1731         }
1732         if (timestamp == 0) {
1733                 return SMB_VFS_NEXT_GETXATTR(handle, fname, aname, value,
1734                                              size);
1735         }
1736         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1737         TALLOC_FREE(stripped);
1738         if (conv == NULL) {
1739                 return -1;
1740         }
1741         ret = SMB_VFS_NEXT_GETXATTR(handle, conv, aname, value, size);
1742         saved_errno = errno;
1743         TALLOC_FREE(conv);
1744         errno = saved_errno;
1745         return ret;
1746 }
1747
1748 static ssize_t shadow_copy2_listxattr(struct vfs_handle_struct *handle,
1749                                       const char *fname,
1750                                       char *list, size_t size)
1751 {
1752         time_t timestamp;
1753         char *stripped;
1754         ssize_t ret;
1755         int saved_errno;
1756         char *conv;
1757
1758         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1759                                          &timestamp, &stripped)) {
1760                 return -1;
1761         }
1762         if (timestamp == 0) {
1763                 return SMB_VFS_NEXT_LISTXATTR(handle, fname, list, size);
1764         }
1765         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1766         TALLOC_FREE(stripped);
1767         if (conv == NULL) {
1768                 return -1;
1769         }
1770         ret = SMB_VFS_NEXT_LISTXATTR(handle, conv, list, size);
1771         saved_errno = errno;
1772         TALLOC_FREE(conv);
1773         errno = saved_errno;
1774         return ret;
1775 }
1776
1777 static int shadow_copy2_removexattr(vfs_handle_struct *handle,
1778                                     const char *fname, const char *aname)
1779 {
1780         time_t timestamp;
1781         char *stripped;
1782         int ret, saved_errno;
1783         char *conv;
1784
1785         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1786                                          &timestamp, &stripped)) {
1787                 return -1;
1788         }
1789         if (timestamp == 0) {
1790                 return SMB_VFS_NEXT_REMOVEXATTR(handle, fname, aname);
1791         }
1792         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1793         TALLOC_FREE(stripped);
1794         if (conv == NULL) {
1795                 return -1;
1796         }
1797         ret = SMB_VFS_NEXT_REMOVEXATTR(handle, conv, aname);
1798         saved_errno = errno;
1799         TALLOC_FREE(conv);
1800         errno = saved_errno;
1801         return ret;
1802 }
1803
1804 static int shadow_copy2_setxattr(struct vfs_handle_struct *handle,
1805                                  const char *fname,
1806                                  const char *aname, const void *value,
1807                                  size_t size, int flags)
1808 {
1809         time_t timestamp;
1810         char *stripped;
1811         ssize_t ret;
1812         int saved_errno;
1813         char *conv;
1814
1815         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1816                                          &timestamp, &stripped)) {
1817                 return -1;
1818         }
1819         if (timestamp == 0) {
1820                 return SMB_VFS_NEXT_SETXATTR(handle, fname, aname, value, size,
1821                                              flags);
1822         }
1823         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1824         TALLOC_FREE(stripped);
1825         if (conv == NULL) {
1826                 return -1;
1827         }
1828         ret = SMB_VFS_NEXT_SETXATTR(handle, conv, aname, value, size, flags);
1829         saved_errno = errno;
1830         TALLOC_FREE(conv);
1831         errno = saved_errno;
1832         return ret;
1833 }
1834
1835 static int shadow_copy2_chmod_acl(vfs_handle_struct *handle,
1836                         const struct smb_filename *smb_fname,
1837                         mode_t mode)
1838 {
1839         time_t timestamp;
1840         char *stripped;
1841         ssize_t ret;
1842         int saved_errno;
1843         char *conv = NULL;
1844         struct smb_filename *conv_smb_fname = NULL;
1845
1846         if (!shadow_copy2_strip_snapshot(talloc_tos(),
1847                                 handle,
1848                                 smb_fname->base_name,
1849                                 &timestamp,
1850                                 &stripped)) {
1851                 return -1;
1852         }
1853         if (timestamp == 0) {
1854                 return SMB_VFS_NEXT_CHMOD_ACL(handle, smb_fname, mode);
1855         }
1856         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1857         TALLOC_FREE(stripped);
1858         if (conv == NULL) {
1859                 return -1;
1860         }
1861         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
1862                                         conv,
1863                                         NULL,
1864                                         NULL,
1865                                         smb_fname->flags);
1866         if (conv_smb_fname == NULL) {
1867                 TALLOC_FREE(conv);
1868                 errno = ENOMEM;
1869                 return -1;
1870         }
1871         ret = SMB_VFS_NEXT_CHMOD_ACL(handle, conv_smb_fname, mode);
1872         saved_errno = errno;
1873         TALLOC_FREE(conv);
1874         TALLOC_FREE(conv_smb_fname);
1875         errno = saved_errno;
1876         return ret;
1877 }
1878
1879 static int shadow_copy2_get_real_filename(struct vfs_handle_struct *handle,
1880                                           const char *path,
1881                                           const char *name,
1882                                           TALLOC_CTX *mem_ctx,
1883                                           char **found_name)
1884 {
1885         time_t timestamp;
1886         char *stripped;
1887         ssize_t ret;
1888         int saved_errno;
1889         char *conv;
1890
1891         DEBUG(10, ("shadow_copy2_get_real_filename called for path=[%s], "
1892                    "name=[%s]\n", path, name));
1893
1894         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, path,
1895                                          &timestamp, &stripped)) {
1896                 DEBUG(10, ("shadow_copy2_strip_snapshot failed\n"));
1897                 return -1;
1898         }
1899         if (timestamp == 0) {
1900                 DEBUG(10, ("timestamp == 0\n"));
1901                 return SMB_VFS_NEXT_GET_REAL_FILENAME(handle, path, name,
1902                                                       mem_ctx, found_name);
1903         }
1904         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1905         TALLOC_FREE(stripped);
1906         if (conv == NULL) {
1907                 DEBUG(10, ("shadow_copy2_convert failed\n"));
1908                 return -1;
1909         }
1910         DEBUG(10, ("Calling NEXT_GET_REAL_FILE_NAME for conv=[%s], "
1911                    "name=[%s]\n", conv, name));
1912         ret = SMB_VFS_NEXT_GET_REAL_FILENAME(handle, conv, name,
1913                                              mem_ctx, found_name);
1914         DEBUG(10, ("NEXT_REAL_FILE_NAME returned %d\n", (int)ret));
1915         saved_errno = errno;
1916         TALLOC_FREE(conv);
1917         errno = saved_errno;
1918         return ret;
1919 }
1920
1921 static const char *shadow_copy2_connectpath(struct vfs_handle_struct *handle,
1922                                             const char *fname)
1923 {
1924         time_t timestamp;
1925         char *stripped = NULL;
1926         char *tmp = NULL;
1927         char *result = NULL;
1928         int saved_errno;
1929         size_t rootpath_len = 0;
1930
1931         DBG_DEBUG("Calc connect path for [%s]\n", fname);
1932
1933         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1934                                          &timestamp, &stripped)) {
1935                 goto done;
1936         }
1937         if (timestamp == 0) {
1938                 return SMB_VFS_NEXT_CONNECTPATH(handle, fname);
1939         }
1940
1941         tmp = shadow_copy2_do_convert(talloc_tos(), handle, stripped, timestamp,
1942                                       &rootpath_len);
1943         if (tmp == NULL) {
1944                 goto done;
1945         }
1946
1947         DBG_DEBUG("converted path is [%s] root path is [%.*s]\n", tmp,
1948                   (int)rootpath_len, tmp);
1949
1950         tmp[rootpath_len] = '\0';
1951         result = SMB_VFS_NEXT_REALPATH(handle, tmp);
1952         if (result == NULL) {
1953                 goto done;
1954         }
1955
1956         DBG_DEBUG("connect path is [%s]\n", result);
1957
1958 done:
1959         saved_errno = errno;
1960         TALLOC_FREE(tmp);
1961         TALLOC_FREE(stripped);
1962         errno = saved_errno;
1963         return result;
1964 }
1965
1966 static uint64_t shadow_copy2_disk_free(vfs_handle_struct *handle,
1967                                        const char *path, uint64_t *bsize,
1968                                        uint64_t *dfree, uint64_t *dsize)
1969 {
1970         time_t timestamp;
1971         char *stripped;
1972         ssize_t ret;
1973         int saved_errno;
1974         char *conv;
1975
1976         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, path,
1977                                          &timestamp, &stripped)) {
1978                 return -1;
1979         }
1980         if (timestamp == 0) {
1981                 return SMB_VFS_NEXT_DISK_FREE(handle, path,
1982                                               bsize, dfree, dsize);
1983         }
1984
1985         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1986         TALLOC_FREE(stripped);
1987         if (conv == NULL) {
1988                 return -1;
1989         }
1990
1991         ret = SMB_VFS_NEXT_DISK_FREE(handle, conv, bsize, dfree, dsize);
1992
1993         saved_errno = errno;
1994         TALLOC_FREE(conv);
1995         errno = saved_errno;
1996
1997         return ret;
1998 }
1999
2000 static int shadow_copy2_get_quota(vfs_handle_struct *handle, const char *path,
2001                                   enum SMB_QUOTA_TYPE qtype, unid_t id,
2002                                   SMB_DISK_QUOTA *dq)
2003 {
2004         time_t timestamp;
2005         char *stripped;
2006         int ret;
2007         int saved_errno;
2008         char *conv;
2009
2010         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, path, &timestamp,
2011                                          &stripped)) {
2012                 return -1;
2013         }
2014         if (timestamp == 0) {
2015                 return SMB_VFS_NEXT_GET_QUOTA(handle, path, qtype, id, dq);
2016         }
2017
2018         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2019         TALLOC_FREE(stripped);
2020         if (conv == NULL) {
2021                 return -1;
2022         }
2023
2024         ret = SMB_VFS_NEXT_GET_QUOTA(handle, conv, qtype, id, dq);
2025
2026         saved_errno = errno;
2027         TALLOC_FREE(conv);
2028         errno = saved_errno;
2029
2030         return ret;
2031 }
2032
2033 static int shadow_copy2_connect(struct vfs_handle_struct *handle,
2034                                 const char *service, const char *user)
2035 {
2036         struct shadow_copy2_config *config;
2037         int ret;
2038         const char *snapdir;
2039         const char *gmt_format;
2040         const char *sort_order;
2041         const char *basedir = NULL;
2042         const char *snapsharepath = NULL;
2043         const char *mount_point;
2044
2045         DEBUG(10, (__location__ ": cnum[%u], connectpath[%s]\n",
2046                    (unsigned)handle->conn->cnum,
2047                    handle->conn->connectpath));
2048
2049         ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
2050         if (ret < 0) {
2051                 return ret;
2052         }
2053
2054         config = talloc_zero(handle->conn, struct shadow_copy2_config);
2055         if (config == NULL) {
2056                 DEBUG(0, ("talloc_zero() failed\n"));
2057                 errno = ENOMEM;
2058                 return -1;
2059         }
2060
2061         gmt_format = lp_parm_const_string(SNUM(handle->conn),
2062                                           "shadow", "format",
2063                                           GMT_FORMAT);
2064         config->gmt_format = talloc_strdup(config, gmt_format);
2065         if (config->gmt_format == NULL) {
2066                 DEBUG(0, ("talloc_strdup() failed\n"));
2067                 errno = ENOMEM;
2068                 return -1;
2069         }
2070
2071         config->use_sscanf = lp_parm_bool(SNUM(handle->conn),
2072                                           "shadow", "sscanf", false);
2073
2074         config->use_localtime = lp_parm_bool(SNUM(handle->conn),
2075                                              "shadow", "localtime",
2076                                              false);
2077
2078         snapdir = lp_parm_const_string(SNUM(handle->conn),
2079                                        "shadow", "snapdir",
2080                                        ".snapshots");
2081         config->snapdir = talloc_strdup(config, snapdir);
2082         if (config->snapdir == NULL) {
2083                 DEBUG(0, ("talloc_strdup() failed\n"));
2084                 errno = ENOMEM;
2085                 return -1;
2086         }
2087
2088         config->snapdirseverywhere = lp_parm_bool(SNUM(handle->conn),
2089                                                   "shadow",
2090                                                   "snapdirseverywhere",
2091                                                   false);
2092
2093         config->crossmountpoints = lp_parm_bool(SNUM(handle->conn),
2094                                                 "shadow", "crossmountpoints",
2095                                                 false);
2096
2097         if (config->crossmountpoints && !config->snapdirseverywhere) {
2098                 DBG_WARNING("Warning: 'crossmountpoints' depends on "
2099                             "'snapdirseverywhere'. Disabling crossmountpoints.\n");
2100         }
2101
2102         config->fixinodes = lp_parm_bool(SNUM(handle->conn),
2103                                          "shadow", "fixinodes",
2104                                          false);
2105
2106         sort_order = lp_parm_const_string(SNUM(handle->conn),
2107                                           "shadow", "sort", "desc");
2108         config->sort_order = talloc_strdup(config, sort_order);
2109         if (config->sort_order == NULL) {
2110                 DEBUG(0, ("talloc_strdup() failed\n"));
2111                 errno = ENOMEM;
2112                 return -1;
2113         }
2114
2115         mount_point = lp_parm_const_string(SNUM(handle->conn),
2116                                            "shadow", "mountpoint", NULL);
2117         if (mount_point != NULL) {
2118                 if (mount_point[0] != '/') {
2119                         DEBUG(1, (__location__ " Warning: 'mountpoint' is "
2120                                   "relative ('%s'), but it has to be an "
2121                                   "absolute path. Ignoring provided value.\n",
2122                                   mount_point));
2123                         mount_point = NULL;
2124                 } else {
2125                         char *p;
2126                         p = strstr(handle->conn->connectpath, mount_point);
2127                         if (p != handle->conn->connectpath) {
2128                                 DBG_WARNING("Warning: the share root (%s) is "
2129                                             "not a subdirectory of the "
2130                                             "specified mountpoint (%s). "
2131                                             "Ignoring provided value.\n",
2132                                             handle->conn->connectpath,
2133                                             mount_point);
2134                                 mount_point = NULL;
2135                         }
2136                 }
2137         }
2138
2139         if (mount_point != NULL) {
2140                 config->mount_point = talloc_strdup(config, mount_point);
2141                 if (config->mount_point == NULL) {
2142                         DEBUG(0, (__location__ " talloc_strdup() failed\n"));
2143                         return -1;
2144                 }
2145         } else {
2146                 config->mount_point = shadow_copy2_find_mount_point(config,
2147                                                                     handle);
2148                 if (config->mount_point == NULL) {
2149                         DBG_WARNING("shadow_copy2_find_mount_point "
2150                                     "of the share root '%s' failed: %s\n",
2151                                     handle->conn->connectpath, strerror(errno));
2152                         return -1;
2153                 }
2154         }
2155
2156         basedir = lp_parm_const_string(SNUM(handle->conn),
2157                                        "shadow", "basedir", NULL);
2158
2159         if (basedir != NULL) {
2160                 if (basedir[0] != '/') {
2161                         DEBUG(1, (__location__ " Warning: 'basedir' is "
2162                                   "relative ('%s'), but it has to be an "
2163                                   "absolute path. Disabling basedir.\n",
2164                                   basedir));
2165                         basedir = NULL;
2166                 } else {
2167                         char *p;
2168                         p = strstr(basedir, config->mount_point);
2169                         if (p != basedir) {
2170                                 DEBUG(1, ("Warning: basedir (%s) is not a "
2171                                           "subdirectory of the share root's "
2172                                           "mount point (%s). "
2173                                           "Disabling basedir\n",
2174                                           basedir, config->mount_point));
2175                                 basedir = NULL;
2176                         }
2177                 }
2178         }
2179
2180         if (config->snapdirseverywhere && basedir != NULL) {
2181                 DEBUG(1, (__location__ " Warning: 'basedir' is incompatible "
2182                           "with 'snapdirseverywhere'. Disabling basedir.\n"));
2183                 basedir = NULL;
2184         }
2185
2186         snapsharepath = lp_parm_const_string(SNUM(handle->conn), "shadow",
2187                                              "snapsharepath", NULL);
2188         if (snapsharepath != NULL) {
2189                 if (snapsharepath[0] == '/') {
2190                         DBG_WARNING("Warning: 'snapsharepath' is "
2191                                     "absolute ('%s'), but it has to be a "
2192                                     "relative path. Disabling snapsharepath.\n",
2193                                     snapsharepath);
2194                         snapsharepath = NULL;
2195                 }
2196                 if (config->snapdirseverywhere && snapsharepath != NULL) {
2197                         DBG_WARNING("Warning: 'snapsharepath' is incompatible "
2198                                     "with 'snapdirseverywhere'. Disabling "
2199                                     "snapsharepath.\n");
2200                         snapsharepath = NULL;
2201                 }
2202         }
2203
2204         if (basedir != NULL && snapsharepath != NULL) {
2205                 DBG_WARNING("Warning: 'snapsharepath' is incompatible with "
2206                             "'basedir'. Disabling snapsharepath\n");
2207                 snapsharepath = NULL;
2208         }
2209
2210         if (snapsharepath != NULL) {
2211                 config->rel_connectpath = talloc_strdup(config, snapsharepath);
2212                 if (config->rel_connectpath == NULL) {
2213                         DBG_ERR("talloc_strdup() failed\n");
2214                         errno = ENOMEM;
2215                         return -1;
2216                 }
2217         }
2218
2219         if (basedir == NULL) {
2220                 basedir = config->mount_point;
2221         }
2222
2223         if (config->rel_connectpath == NULL &&
2224             strlen(basedir) != strlen(handle->conn->connectpath)) {
2225                 config->rel_connectpath = talloc_strdup(config,
2226                         handle->conn->connectpath + strlen(basedir));
2227                 if (config->rel_connectpath == NULL) {
2228                         DEBUG(0, ("talloc_strdup() failed\n"));
2229                         errno = ENOMEM;
2230                         return -1;
2231                 }
2232         }
2233
2234         if (config->snapdir[0] == '/') {
2235                 config->snapdir_absolute = true;
2236
2237                 if (config->snapdirseverywhere == true) {
2238                         DEBUG(1, (__location__ " Warning: An absolute snapdir "
2239                                   "is incompatible with 'snapdirseverywhere', "
2240                                   "setting 'snapdirseverywhere' to false.\n"));
2241                         config->snapdirseverywhere = false;
2242                 }
2243
2244                 if (config->crossmountpoints == true) {
2245                         DEBUG(1, (__location__ " Warning: 'crossmountpoints' "
2246                                   "is not supported with an absolute snapdir. "
2247                                   "Disabling it.\n"));
2248                         config->crossmountpoints = false;
2249                 }
2250
2251                 config->snapshot_basepath = config->snapdir;
2252         } else {
2253                 config->snapshot_basepath = talloc_asprintf(config, "%s/%s",
2254                                 config->mount_point, config->snapdir);
2255                 if (config->snapshot_basepath == NULL) {
2256                         DEBUG(0, ("talloc_asprintf() failed\n"));
2257                         errno = ENOMEM;
2258                         return -1;
2259                 }
2260         }
2261
2262         DEBUG(10, ("shadow_copy2_connect: configuration:\n"
2263                    "  share root: '%s'\n"
2264                    "  mountpoint: '%s'\n"
2265                    "  rel share root: '%s'\n"
2266                    "  snapdir: '%s'\n"
2267                    "  snapshot base path: '%s'\n"
2268                    "  format: '%s'\n"
2269                    "  use sscanf: %s\n"
2270                    "  snapdirs everywhere: %s\n"
2271                    "  cross mountpoints: %s\n"
2272                    "  fix inodes: %s\n"
2273                    "  sort order: %s\n"
2274                    "",
2275                    handle->conn->connectpath,
2276                    config->mount_point,
2277                    config->rel_connectpath,
2278                    config->snapdir,
2279                    config->snapshot_basepath,
2280                    config->gmt_format,
2281                    config->use_sscanf ? "yes" : "no",
2282                    config->snapdirseverywhere ? "yes" : "no",
2283                    config->crossmountpoints ? "yes" : "no",
2284                    config->fixinodes ? "yes" : "no",
2285                    config->sort_order
2286                    ));
2287
2288
2289         SMB_VFS_HANDLE_SET_DATA(handle, config,
2290                                 NULL, struct shadow_copy2_config,
2291                                 return -1);
2292
2293         return 0;
2294 }
2295
2296 static struct vfs_fn_pointers vfs_shadow_copy2_fns = {
2297         .connect_fn = shadow_copy2_connect,
2298         .opendir_fn = shadow_copy2_opendir,
2299         .disk_free_fn = shadow_copy2_disk_free,
2300         .get_quota_fn = shadow_copy2_get_quota,
2301         .rename_fn = shadow_copy2_rename,
2302         .link_fn = shadow_copy2_link,
2303         .symlink_fn = shadow_copy2_symlink,
2304         .stat_fn = shadow_copy2_stat,
2305         .lstat_fn = shadow_copy2_lstat,
2306         .fstat_fn = shadow_copy2_fstat,
2307         .open_fn = shadow_copy2_open,
2308         .unlink_fn = shadow_copy2_unlink,
2309         .chmod_fn = shadow_copy2_chmod,
2310         .chown_fn = shadow_copy2_chown,
2311         .chdir_fn = shadow_copy2_chdir,
2312         .ntimes_fn = shadow_copy2_ntimes,
2313         .readlink_fn = shadow_copy2_readlink,
2314         .mknod_fn = shadow_copy2_mknod,
2315         .realpath_fn = shadow_copy2_realpath,
2316         .get_nt_acl_fn = shadow_copy2_get_nt_acl,
2317         .fget_nt_acl_fn = shadow_copy2_fget_nt_acl,
2318         .get_shadow_copy_data_fn = shadow_copy2_get_shadow_copy_data,
2319         .mkdir_fn = shadow_copy2_mkdir,
2320         .rmdir_fn = shadow_copy2_rmdir,
2321         .getxattr_fn = shadow_copy2_getxattr,
2322         .listxattr_fn = shadow_copy2_listxattr,
2323         .removexattr_fn = shadow_copy2_removexattr,
2324         .setxattr_fn = shadow_copy2_setxattr,
2325         .chmod_acl_fn = shadow_copy2_chmod_acl,
2326         .chflags_fn = shadow_copy2_chflags,
2327         .get_real_filename_fn = shadow_copy2_get_real_filename,
2328         .connectpath_fn = shadow_copy2_connectpath,
2329 };
2330
2331 NTSTATUS vfs_shadow_copy2_init(void);
2332 NTSTATUS vfs_shadow_copy2_init(void)
2333 {
2334         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION,
2335                                 "shadow_copy2", &vfs_shadow_copy2_fns);
2336 }