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  * Copyright (C) Rajesh Joseph     2016
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24  */
  25
  26 /*
  27  * This is a second implemetation of a shadow copy module for exposing
  28  * file system snapshots to windows clients as shadow copies.
  29  *
  30  * See the manual page for documentation.
  31  */
  32
  33 #include "includes.h"
  34 #include "smbd/smbd.h"
  35 #include "system/filesys.h"
  36 #include "include/ntioctl.h"
  37 #include "util_tdb.h"
  38 #include "lib/util_path.h"
  39 #include "libcli/security/security.h"
  40 #include "lib/util/tevent_unix.h"
  41
  42 struct shadow_copy2_config {
  43         char *gmt_format;
  44         bool use_sscanf;
  45         bool use_localtime;
  46         char *snapdir;
  47         char *delimiter;
  48         bool snapdirseverywhere;
  49         bool crossmountpoints;
  50         bool fixinodes;
  51         char *sort_order;
  52         bool snapdir_absolute;
  53         char *mount_point;
  54         char *rel_connectpath; /* share root, relative to a snapshot root */
  55         char *snapshot_basepath; /* the absolute version of snapdir */
  56 };
  57
  58 /* Data-structure to hold the list of snap entries */
  59 struct shadow_copy2_snapentry {
  60         char *snapname;
  61         char *time_fmt;
  62         struct shadow_copy2_snapentry *next;
  63         struct shadow_copy2_snapentry *prev;
  64 };
  65
  66 struct shadow_copy2_snaplist_info {
  67         struct shadow_copy2_snapentry *snaplist; /* snapshot list */
  68         regex_t *regex; /* Regex to filter snaps */
  69         time_t fetch_time; /* snaplist update time */
  70 };
  71
  72 /*
  73  * shadow_copy2 private structure. This structure will be
  74  * used to keep module specific information
  75  */
  76 struct shadow_copy2_private {
  77         struct shadow_copy2_config *config;
  78         struct shadow_copy2_snaplist_info *snaps;
  79         char *shadow_cwd; /* Absolute $cwd path. */
  80         /* Absolute connectpath - can vary depending on $cwd. */
  81         char *shadow_connectpath;
  82         /* talloc'ed realpath return. */
  83         struct smb_filename *shadow_realpath;
  84 };
  85
  86 static int shadow_copy2_get_shadow_copy_data(
  87         vfs_handle_struct *handle, files_struct *fsp,
  88         struct shadow_copy_data *shadow_copy2_data,
  89         bool labels);
  90
  91 /**
  92  * This function will create a new snapshot list entry and
  93  * return to the caller. This entry will also be added to
  94  * the global snapshot list.
  95  *
  96  * @param[in]   priv    shadow_copy2 specific data structure
  97  * @return      Newly   created snapshot entry or NULL on failure
  98  */
  99 static struct shadow_copy2_snapentry *shadow_copy2_create_snapentry(
 100                                         struct shadow_copy2_private *priv)
 101 {
 102         struct shadow_copy2_snapentry *tmpentry = NULL;
 103
 104         tmpentry = talloc_zero(priv->snaps, struct shadow_copy2_snapentry);
 105         if (tmpentry == NULL) {
 106                 DBG_ERR("talloc_zero() failed\n");
 107                 errno = ENOMEM;
 108                 return NULL;
 109         }
 110
 111         DLIST_ADD(priv->snaps->snaplist, tmpentry);
 112
 113         return tmpentry;
 114 }
 115
 116 /**
 117  * This function will delete the entire snaplist and reset
 118  * priv->snaps->snaplist to NULL.
 119  *
 120  * @param[in] priv shadow_copye specific data structure
 121  */
 122 static void shadow_copy2_delete_snaplist(struct shadow_copy2_private *priv)
 123 {
 124         struct shadow_copy2_snapentry *tmp = NULL;
 125
 126         while ((tmp = priv->snaps->snaplist) != NULL) {
 127                 DLIST_REMOVE(priv->snaps->snaplist, tmp);
 128                 talloc_free(tmp);
 129         }
 130 }
 131
 132 /**
 133  * Given a timestamp this function searches the global snapshot list
 134  * and returns the complete snapshot directory name saved in the entry.
 135  *
 136  * @param[in]   priv            shadow_copy2 specific structure
 137  * @param[in]   timestamp       timestamp corresponding to one of the snapshot
 138  * @param[out]  snap_str        buffer to copy the actual snapshot name
 139  * @param[in]   len             length of snap_str buffer
 140  *
 141  * @return      Length of actual snapshot name, and -1 on failure
 142  */
 143 static ssize_t shadow_copy2_saved_snapname(struct shadow_copy2_private *priv,
 144                                           struct tm *timestamp,
 145                                           char *snap_str, size_t len)
 146 {
 147         ssize_t snaptime_len = -1;
 148         struct shadow_copy2_snapentry *entry = NULL;
 149
 150         snaptime_len = strftime(snap_str, len, GMT_FORMAT, timestamp);
 151         if (snaptime_len == 0) {
 152                 DBG_ERR("strftime failed\n");
 153                 return -1;
 154         }
 155
 156         snaptime_len = -1;
 157
 158         for (entry = priv->snaps->snaplist; entry; entry = entry->next) {
 159                 if (strcmp(entry->time_fmt, snap_str) == 0) {
 160                         snaptime_len = snprintf(snap_str, len, "%s",
 161                                                 entry->snapname);
 162                         return snaptime_len;
 163                 }
 164         }
 165
 166         snap_str[0] = 0;
 167         return snaptime_len;
 168 }
 169
 170
 171 /**
 172  * This function will check if snaplist is updated or not. If snaplist
 173  * is empty then it will create a new list. Each time snaplist is updated
 174  * the time is recorded. If the snapshot time is greater than the snaplist
 175  * update time then chances are we are working on an older list. Then discard
 176  * the old list and fetch a new snaplist.
 177  *
 178  * @param[in]   handle          VFS handle struct
 179  * @param[in]   snap_time       time of snapshot
 180  *
 181  * @return      true if the list is updated else false
 182  */
 183 static bool shadow_copy2_update_snaplist(struct vfs_handle_struct *handle,
 184                 time_t snap_time)
 185 {
 186         int ret = -1;
 187         bool snaplist_updated = false;
 188         struct files_struct fsp = {0};
 189         struct smb_filename smb_fname = {0};
 190         double seconds = 0.0;
 191         struct shadow_copy2_private *priv = NULL;
 192
 193         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
 194                                 return false);
 195
 196         seconds = difftime(snap_time, priv->snaps->fetch_time);
 197
 198         /*
 199          * Fetch the snapshot list if either the snaplist is empty or the
 200          * required snapshot time is greater than the last fetched snaplist
 201          * time.
 202          */
 203         if (seconds > 0 || (priv->snaps->snaplist == NULL)) {
 204                 smb_fname.base_name = discard_const_p(char, ".");
 205                 fsp.fsp_name = &smb_fname;
 206
 207                 ret = shadow_copy2_get_shadow_copy_data(handle, &fsp,
 208                                                         NULL, false);
 209                 if (ret == 0) {
 210                         snaplist_updated = true;
 211                 } else {
 212                         DBG_ERR("Failed to get shadow copy data\n");
 213                 }
 214
 215         }
 216
 217         return snaplist_updated;
 218 }
 219
 220 static bool shadow_copy2_find_slashes(TALLOC_CTX *mem_ctx, const char *str,
 221                                       size_t **poffsets,
 222                                       unsigned *pnum_offsets)
 223 {
 224         unsigned num_offsets;
 225         size_t *offsets;
 226         const char *p;
 227
 228         num_offsets = 0;
 229
 230         p = str;
 231         while ((p = strchr(p, '/')) != NULL) {
 232                 num_offsets += 1;
 233                 p += 1;
 234         }
 235
 236         offsets = talloc_array(mem_ctx, size_t, num_offsets);
 237         if (offsets == NULL) {
 238                 return false;
 239         }
 240
 241         p = str;
 242         num_offsets = 0;
 243         while ((p = strchr(p, '/')) != NULL) {
 244                 offsets[num_offsets] = p-str;
 245                 num_offsets += 1;
 246                 p += 1;
 247         }
 248
 249         *poffsets = offsets;
 250         *pnum_offsets = num_offsets;
 251         return true;
 252 }
 253
 254 /**
 255  * Given a timestamp, build the posix level GMT-tag string
 256  * based on the configurable format.
 257  */
 258 static ssize_t shadow_copy2_posix_gmt_string(struct vfs_handle_struct *handle,
 259                                             time_t snapshot,
 260                                             char *snaptime_string,
 261                                             size_t len)
 262 {
 263         struct tm snap_tm;
 264         ssize_t snaptime_len;
 265         struct shadow_copy2_config *config;
 266         struct shadow_copy2_private *priv;
 267
 268         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
 269                                 return 0);
 270
 271         config = priv->config;
 272
 273         if (config->use_sscanf) {
 274                 snaptime_len = snprintf(snaptime_string,
 275                                         len,
 276                                         config->gmt_format,
 277                                         (unsigned long)snapshot);
 278                 if (snaptime_len <= 0) {
 279                         DEBUG(10, ("snprintf failed\n"));
 280                         return -1;
 281                 }
 282         } else {
 283                 if (config->use_localtime) {
 284                         if (localtime_r(&snapshot, &snap_tm) == 0) {
 285                                 DEBUG(10, ("gmtime_r failed\n"));
 286                                 return -1;
 287                         }
 288                 } else {
 289                         if (gmtime_r(&snapshot, &snap_tm) == 0) {
 290                                 DEBUG(10, ("gmtime_r failed\n"));
 291                                 return -1;
 292                         }
 293                 }
 294
 295                 if (priv->snaps->regex != NULL) {
 296                         snaptime_len = shadow_copy2_saved_snapname(priv,
 297                                                 &snap_tm, snaptime_string, len);
 298                         if (snaptime_len >= 0)
 299                                 return snaptime_len;
 300
 301                         /*
 302                          * If we fail to find the snapshot name, chances are
 303                          * that we have not updated our snaplist. Make sure the
 304                          * snaplist is updated.
 305                          */
 306                         if (!shadow_copy2_update_snaplist(handle, snapshot)) {
 307                                 DBG_DEBUG("shadow_copy2_update_snaplist "
 308                                           "failed\n");
 309                                 return -1;
 310                         }
 311
 312                         return shadow_copy2_saved_snapname(priv,
 313                                                 &snap_tm, snaptime_string, len);
 314                 }
 315
 316                 snaptime_len = strftime(snaptime_string,
 317                                         len,
 318                                         config->gmt_format,
 319                                         &snap_tm);
 320                 if (snaptime_len == 0) {
 321                         DEBUG(10, ("strftime failed\n"));
 322                         return -1;
 323                 }
 324         }
 325
 326         return snaptime_len;
 327 }
 328
 329 /**
 330  * Given a timestamp, build the string to insert into a path
 331  * as a path component for creating the local path to the
 332  * snapshot at the given timestamp of the input path.
 333  *
 334  * In the case of a parallel snapdir (specified with an
 335  * absolute path), this is the initial portion of the
 336  * local path of any snapshot file. The complete path is
 337  * obtained by appending the portion of the file's path
 338  * below the share root's mountpoint.
 339  */
 340 static char *shadow_copy2_insert_string(TALLOC_CTX *mem_ctx,
 341                                         struct vfs_handle_struct *handle,
 342                                         time_t snapshot)
 343 {
 344         fstring snaptime_string;
 345         ssize_t snaptime_len = 0;
 346         char *result = NULL;
 347         struct shadow_copy2_config *config;
 348         struct shadow_copy2_private *priv;
 349
 350         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
 351                                 return NULL);
 352
 353         config = priv->config;
 354
 355         snaptime_len = shadow_copy2_posix_gmt_string(handle,
 356                                                      snapshot,
 357                                                      snaptime_string,
 358                                                      sizeof(snaptime_string));
 359         if (snaptime_len <= 0) {
 360                 return NULL;
 361         }
 362
 363         if (config->snapdir_absolute) {
 364                 result = talloc_asprintf(mem_ctx, "%s/%s",
 365                                          config->snapdir, snaptime_string);
 366         } else {
 367                 result = talloc_asprintf(mem_ctx, "/%s/%s",
 368                                          config->snapdir, snaptime_string);
 369         }
 370         if (result == NULL) {
 371                 DEBUG(1, (__location__ " talloc_asprintf failed\n"));
 372         }
 373
 374         return result;
 375 }
 376
 377 /**
 378  * Build the posix snapshot path for the connection
 379  * at the given timestamp, i.e. the absolute posix path
 380  * that contains the snapshot for this file system.
 381  *
 382  * This only applies to classical case, i.e. not
 383  * to the "snapdirseverywhere" mode.
 384  */
 385 static char *shadow_copy2_snapshot_path(TALLOC_CTX *mem_ctx,
 386                                         struct vfs_handle_struct *handle,
 387                                         time_t snapshot)
 388 {
 389         fstring snaptime_string;
 390         ssize_t snaptime_len = 0;
 391         char *result = NULL;
 392         struct shadow_copy2_private *priv;
 393
 394         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
 395                                 return NULL);
 396
 397         snaptime_len = shadow_copy2_posix_gmt_string(handle,
 398                                                      snapshot,
 399                                                      snaptime_string,
 400                                                      sizeof(snaptime_string));
 401         if (snaptime_len <= 0) {
 402                 return NULL;
 403         }
 404
 405         result = talloc_asprintf(mem_ctx, "%s/%s",
 406                                  priv->config->snapshot_basepath, snaptime_string);
 407         if (result == NULL) {
 408                 DEBUG(1, (__location__ " talloc_asprintf failed\n"));
 409         }
 410
 411         return result;
 412 }
 413
 414 static char *make_path_absolute(TALLOC_CTX *mem_ctx,
 415                                 struct shadow_copy2_private *priv,
 416                                 const char *name)
 417 {
 418         char *newpath = NULL;
 419         char *abs_path = NULL;
 420
 421         if (name[0] != '/') {
 422                 newpath = talloc_asprintf(mem_ctx,
 423                                         "%s/%s",
 424                                         priv->shadow_cwd,
 425                                         name);
 426                 if (newpath == NULL) {
 427                         return NULL;
 428                 }
 429                 name = newpath;
 430         }
 431         abs_path = canonicalize_absolute_path(mem_ctx, name);
 432         TALLOC_FREE(newpath);
 433         return abs_path;
 434 }
 435
 436 /* Return a $cwd-relative path. */
 437 static bool make_relative_path(const char *cwd, char *abs_path)
 438 {
 439         size_t cwd_len = strlen(cwd);
 440         size_t abs_len = strlen(abs_path);
 441
 442         if (abs_len < cwd_len) {
 443                 return false;
 444         }
 445         if (memcmp(abs_path, cwd, cwd_len) != 0) {
 446                 return false;
 447         }
 448         /* The cwd_len != 1 case is for $cwd == '/' */
 449         if (cwd_len != 1 &&
 450             abs_path[cwd_len] != '/' &&
 451             abs_path[cwd_len] != '\0')
 452         {
 453                 return false;
 454         }
 455         if (abs_path[cwd_len] == '/') {
 456                 cwd_len++;
 457         }
 458         memmove(abs_path, &abs_path[cwd_len], abs_len + 1 - cwd_len);
 459         return true;
 460 }
 461
 462 static bool shadow_copy2_snapshot_to_gmt(vfs_handle_struct *handle,
 463                                         const char *name,
 464                                         char *gmt, size_t gmt_len);
 465
 466 /*
 467  * Check if an incoming filename is already a snapshot converted pathname.
 468  *
 469  * If so, it returns the pathname truncated at the snapshot point which
 470  * will be used as the connectpath.
 471  */
 472
 473 static int check_for_converted_path(TALLOC_CTX *mem_ctx,
 474                                 struct vfs_handle_struct *handle,
 475                                 struct shadow_copy2_private *priv,
 476                                 char *abs_path,
 477                                 bool *ppath_already_converted,
 478                                 char **pconnectpath)
 479 {
 480         size_t snapdirlen = 0;
 481         char *p = strstr_m(abs_path, priv->config->snapdir);
 482         char *q = NULL;
 483         char *connect_path = NULL;
 484         char snapshot[GMT_NAME_LEN+1];
 485
 486         *ppath_already_converted = false;
 487
 488         if (p == NULL) {
 489                 /* Must at least contain shadow:snapdir. */
 490                 return 0;
 491         }
 492
 493         if (priv->config->snapdir[0] == '/' &&
 494                         p != abs_path) {
 495                 /* Absolute shadow:snapdir must be at the start. */
 496                 return 0;
 497         }
 498
 499         snapdirlen = strlen(priv->config->snapdir);
 500         if (p[snapdirlen] != '/') {
 501                 /* shadow:snapdir must end as a separate component. */
 502                 return 0;
 503         }
 504
 505         if (p > abs_path && p[-1] != '/') {
 506                 /* shadow:snapdir must start as a separate component. */
 507                 return 0;
 508         }
 509
 510         p += snapdirlen;
 511         p++; /* Move past the / */
 512
 513         /*
 514          * Need to return up to the next path
 515          * component after the time.
 516          * This will be used as the connectpath.
 517          */
 518         q = strchr(p, '/');
 519         if (q == NULL) {
 520                 /*
 521                  * No next path component.
 522                  * Use entire string.
 523                  */
 524                 connect_path = talloc_strdup(mem_ctx,
 525                                         abs_path);
 526         } else {
 527                 connect_path = talloc_strndup(mem_ctx,
 528                                         abs_path,
 529                                         q - abs_path);
 530         }
 531         if (connect_path == NULL) {
 532                 return ENOMEM;
 533         }
 534
 535         /*
 536          * Point p at the same offset in connect_path as
 537          * it is in abs_path.
 538          */
 539
 540         p = &connect_path[p - abs_path];
 541
 542         /*
 543          * Now ensure there is a time string at p.
 544          * The SMB-format @GMT-token string is returned
 545          * in snapshot.
 546          */
 547
 548         if (!shadow_copy2_snapshot_to_gmt(handle,
 549                                 p,
 550                                 snapshot,
 551                                 sizeof(snapshot))) {
 552                 TALLOC_FREE(connect_path);
 553                 return 0;
 554         }
 555
 556         if (pconnectpath != NULL) {
 557                 *pconnectpath = connect_path;
 558         }
 559
 560         *ppath_already_converted = true;
 561
 562         DBG_DEBUG("path |%s| is already converted. "
 563                 "connect path = |%s|\n",
 564                 abs_path,
 565                 connect_path);
 566
 567         return 0;
 568 }
 569
 570 /**
 571  * This function does two things.
 572  *
 573  * 1). Checks if an incoming filename is already a
 574  *     snapshot converted pathname.
 575  *     If so, it returns the pathname truncated
 576  *     at the snapshot point which will be used
 577  *     as the connectpath, and then does an early return.
 578  *
 579  * 2). Checks if an incoming filename contains an
 580  *     SMB-layer @GMT- style timestamp.
 581  *     If so, it strips the timestamp, and returns
 582  *     both the timestamp and the stripped path
 583  *     (making it cwd-relative).
 584  */
 585
 586 static bool _shadow_copy2_strip_snapshot_internal(TALLOC_CTX *mem_ctx,
 587                                         struct vfs_handle_struct *handle,
 588                                         const struct smb_filename *smb_fname,
 589                                         time_t *ptimestamp,
 590                                         char **pstripped,
 591                                         char **psnappath,
 592                                         bool *_already_converted,
 593                                         const char *function)
 594 {
 595         char *stripped = NULL;
 596         struct shadow_copy2_private *priv;
 597         char *abs_path = NULL;
 598         bool ret = true;
 599         bool already_converted = false;
 600         int err = 0;
 601
 602         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
 603                                 return false);
 604
 605         DBG_DEBUG("[from %s()] Path '%s'\n",
 606                   function, smb_fname_str_dbg(smb_fname));
 607
 608         if (_already_converted != NULL) {
 609                 *_already_converted = false;
 610         }
 611
 612         abs_path = make_path_absolute(mem_ctx, priv, smb_fname->base_name);
 613         if (abs_path == NULL) {
 614                 ret = false;
 615                 goto out;
 616         }
 617
 618         DBG_DEBUG("abs path '%s'\n", abs_path);
 619
 620         err = check_for_converted_path(mem_ctx,
 621                                         handle,
 622                                         priv,
 623                                         abs_path,
 624                                         &already_converted,
 625                                         psnappath);
 626         if (err != 0) {
 627                 /* error in conversion. */
 628                 ret = false;
 629                 goto out;
 630         }
 631
 632         if (already_converted) {
 633                 if (_already_converted != NULL) {
 634                         *_already_converted = true;
 635                 }
 636                 goto out;
 637         }
 638
 639         if (smb_fname->twrp == 0) {
 640                 goto out;
 641         }
 642
 643         if (ptimestamp != NULL) {
 644                 *ptimestamp = nt_time_to_unix(smb_fname->twrp);
 645         }
 646
 647         if (pstripped != NULL) {
 648                 stripped = talloc_strdup(mem_ctx, abs_path);
 649                 if (stripped == NULL) {
 650                         ret = false;
 651                         goto out;
 652                 }
 653
 654                 if (smb_fname->base_name[0] != '/') {
 655                         ret = make_relative_path(priv->shadow_cwd, stripped);
 656                         if (!ret) {
 657                                 DBG_DEBUG("Path '%s' "
 658                                         "doesn't start with cwd '%s'\n",
 659                                         stripped, priv->shadow_cwd);
 660                                 ret = false;
 661                                 errno = ENOENT;
 662                                 goto out;
 663                         }
 664                 }
 665                 *pstripped = stripped;
 666         }
 667
 668         ret = true;
 669
 670   out:
 671         TALLOC_FREE(abs_path);
 672         return ret;
 673 }
 674
 675 #define shadow_copy2_strip_snapshot_internal(mem_ctx, handle, orig_name, \
 676                 ptimestamp, pstripped, psnappath, _already_converted) \
 677         _shadow_copy2_strip_snapshot_internal((mem_ctx), (handle), (orig_name), \
 678                 (ptimestamp), (pstripped), (psnappath), (_already_converted), \
 679                                               __FUNCTION__)
 680
 681 static bool _shadow_copy2_strip_snapshot(TALLOC_CTX *mem_ctx,
 682                                          struct vfs_handle_struct *handle,
 683                                          const struct smb_filename *orig_name,
 684                                          time_t *ptimestamp,
 685                                          char **pstripped,
 686                                          const char *function)
 687 {
 688         return _shadow_copy2_strip_snapshot_internal(mem_ctx,
 689                                         handle,
 690                                         orig_name,
 691                                         ptimestamp,
 692                                         pstripped,
 693                                         NULL,
 694                                         NULL,
 695                                         function);
 696 }
 697
 698 #define shadow_copy2_strip_snapshot(mem_ctx, handle, orig_name, \
 699                 ptimestamp, pstripped) \
 700         _shadow_copy2_strip_snapshot((mem_ctx), (handle), (orig_name), \
 701                 (ptimestamp), (pstripped), __FUNCTION__)
 702
 703 static bool _shadow_copy2_strip_snapshot_converted(TALLOC_CTX *mem_ctx,
 704                                         struct vfs_handle_struct *handle,
 705                                         const struct smb_filename *orig_name,
 706                                         time_t *ptimestamp,
 707                                         char **pstripped,
 708                                         bool *is_converted,
 709                                         const char *function)
 710 {
 711         return _shadow_copy2_strip_snapshot_internal(mem_ctx,
 712                                         handle,
 713                                         orig_name,
 714                                         ptimestamp,
 715                                         pstripped,
 716                                         NULL,
 717                                         is_converted,
 718                                         function);
 719 }
 720
 721 #define shadow_copy2_strip_snapshot_converted(mem_ctx, handle, orig_name, \
 722                 ptimestamp, pstripped, is_converted) \
 723         _shadow_copy2_strip_snapshot_converted((mem_ctx), (handle), (orig_name), \
 724                 (ptimestamp), (pstripped), (is_converted), __FUNCTION__)
 725
 726 static char *shadow_copy2_find_mount_point(TALLOC_CTX *mem_ctx,
 727                                            vfs_handle_struct *handle)
 728 {
 729         char *path = talloc_strdup(mem_ctx, handle->conn->connectpath);
 730         dev_t dev;
 731         struct stat st;
 732         char *p;
 733
 734         if (stat(path, &st) != 0) {
 735                 talloc_free(path);
 736                 return NULL;
 737         }
 738
 739         dev = st.st_dev;
 740
 741         while ((p = strrchr(path, '/')) && p > path) {
 742                 *p = 0;
 743                 if (stat(path, &st) != 0) {
 744                         talloc_free(path);
 745                         return NULL;
 746                 }
 747                 if (st.st_dev != dev) {
 748                         *p = '/';
 749                         break;
 750                 }
 751         }
 752
 753         return path;
 754 }
 755
 756 /**
 757  * Convert from a name as handed in via the SMB layer
 758  * and a timestamp into the local path of the snapshot
 759  * of the provided file at the provided time.
 760  * Also return the path in the snapshot corresponding
 761  * to the file's share root.
 762  */
 763 static char *shadow_copy2_do_convert(TALLOC_CTX *mem_ctx,
 764                                      struct vfs_handle_struct *handle,
 765                                      const char *name, time_t timestamp,
 766                                      size_t *snaproot_len)
 767 {
 768         struct smb_filename converted_fname;
 769         char *result = NULL;
 770         size_t *slashes = NULL;
 771         unsigned num_slashes;
 772         char *path = NULL;
 773         size_t pathlen;
 774         char *insert = NULL;
 775         char *converted = NULL;
 776         size_t insertlen, connectlen = 0;
 777         int saved_errno = 0;
 778         int i;
 779         size_t min_offset;
 780         struct shadow_copy2_config *config;
 781         struct shadow_copy2_private *priv;
 782         size_t in_share_offset = 0;
 783
 784         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
 785                                 return NULL);
 786
 787         config = priv->config;
 788
 789         DEBUG(10, ("converting '%s'\n", name));
 790
 791         if (!config->snapdirseverywhere) {
 792                 int ret;
 793                 char *snapshot_path;
 794
 795                 snapshot_path = shadow_copy2_snapshot_path(talloc_tos(),
 796                                                            handle,
 797                                                            timestamp);
 798                 if (snapshot_path == NULL) {
 799                         goto fail;
 800                 }
 801
 802                 if (config->rel_connectpath == NULL) {
 803                         converted = talloc_asprintf(mem_ctx, "%s/%s",
 804                                                     snapshot_path, name);
 805                 } else {
 806                         converted = talloc_asprintf(mem_ctx, "%s/%s/%s",
 807                                                     snapshot_path,
 808                                                     config->rel_connectpath,
 809                                                     name);
 810                 }
 811                 if (converted == NULL) {
 812                         goto fail;
 813                 }
 814
 815                 converted_fname = (struct smb_filename) {
 816                         .base_name = converted,
 817                 };
 818
 819                 ret = SMB_VFS_NEXT_LSTAT(handle, &converted_fname);
 820                 DEBUG(10, ("Trying[not snapdirseverywhere] %s: %d (%s)\n",
 821                            converted,
 822                            ret, ret == 0 ? "ok" : strerror(errno)));
 823                 if (ret == 0) {
 824                         DEBUG(10, ("Found %s\n", converted));
 825                         result = converted;
 826                         converted = NULL;
 827                         if (snaproot_len != NULL) {
 828                                 *snaproot_len = strlen(snapshot_path);
 829                                 if (config->rel_connectpath != NULL) {
 830                                         *snaproot_len +=
 831                                             strlen(config->rel_connectpath) + 1;
 832                                 }
 833                         }
 834                         goto fail;
 835                 } else {
 836                         errno = ENOENT;
 837                         goto fail;
 838                 }
 839                 /* never reached ... */
 840         }
 841
 842         connectlen = strlen(handle->conn->connectpath);
 843         if (name[0] == 0) {
 844                 path = talloc_strdup(mem_ctx, handle->conn->connectpath);
 845         } else {
 846                 path = talloc_asprintf(
 847                         mem_ctx, "%s/%s", handle->conn->connectpath, name);
 848         }
 849         if (path == NULL) {
 850                 errno = ENOMEM;
 851                 goto fail;
 852         }
 853         pathlen = talloc_get_size(path)-1;
 854
 855         if (!shadow_copy2_find_slashes(talloc_tos(), path,
 856                                        &slashes, &num_slashes)) {
 857                 goto fail;
 858         }
 859
 860         insert = shadow_copy2_insert_string(talloc_tos(), handle, timestamp);
 861         if (insert == NULL) {
 862                 goto fail;
 863         }
 864         insertlen = talloc_get_size(insert)-1;
 865
 866         /*
 867          * Note: We deliberatly don't expensively initialize the
 868          * array with talloc_zero here: Putting zero into
 869          * converted[pathlen+insertlen] below is sufficient, because
 870          * in the following for loop, the insert string is inserted
 871          * at various slash places. So the memory up to position
 872          * pathlen+insertlen will always be initialized when the
 873          * converted string is used.
 874          */
 875         converted = talloc_array(mem_ctx, char, pathlen + insertlen + 1);
 876         if (converted == NULL) {
 877                 goto fail;
 878         }
 879
 880         if (path[pathlen-1] != '/') {
 881                 /*
 882                  * Append a fake slash to find the snapshot root
 883                  */
 884                 size_t *tmp;
 885                 tmp = talloc_realloc(talloc_tos(), slashes,
 886                                      size_t, num_slashes+1);
 887                 if (tmp == NULL) {
 888                         goto fail;
 889                 }
 890                 slashes = tmp;
 891                 slashes[num_slashes] = pathlen;
 892                 num_slashes += 1;
 893         }
 894
 895         min_offset = 0;
 896
 897         if (!config->crossmountpoints) {
 898                 min_offset = strlen(config->mount_point);
 899         }
 900
 901         memcpy(converted, path, pathlen+1);
 902         converted[pathlen+insertlen] = '\0';
 903
 904         converted_fname = (struct smb_filename) {
 905                 .base_name = converted,
 906         };
 907
 908         for (i = num_slashes-1; i>=0; i--) {
 909                 int ret;
 910                 size_t offset;
 911
 912                 offset = slashes[i];
 913
 914                 if (offset < min_offset) {
 915                         errno = ENOENT;
 916                         goto fail;
 917                 }
 918
 919                 if (offset >= connectlen) {
 920                         in_share_offset = offset;
 921                 }
 922
 923                 memcpy(converted+offset, insert, insertlen);
 924
 925                 offset += insertlen;
 926                 memcpy(converted+offset, path + slashes[i],
 927                        pathlen - slashes[i]);
 928
 929                 ret = SMB_VFS_NEXT_LSTAT(handle, &converted_fname);
 930
 931                 DEBUG(10, ("Trying[snapdirseverywhere] %s: %d (%s)\n",
 932                            converted,
 933                            ret, ret == 0 ? "ok" : strerror(errno)));
 934                 if (ret == 0) {
 935                         /* success */
 936                         if (snaproot_len != NULL) {
 937                                 *snaproot_len = in_share_offset + insertlen;
 938                         }
 939                         break;
 940                 }
 941                 if (errno == ENOTDIR) {
 942                         /*
 943                          * This is a valid condition: We appended the
 944                          * .snapshots/@GMT.. to a file name. Just try
 945                          * with the upper levels.
 946                          */
 947                         continue;
 948                 }
 949                 if (errno != ENOENT) {
 950                         /* Other problem than "not found" */
 951                         goto fail;
 952                 }
 953         }
 954
 955         if (i >= 0) {
 956                 /*
 957                  * Found something
 958                  */
 959                 DEBUG(10, ("Found %s\n", converted));
 960                 result = converted;
 961                 converted = NULL;
 962         } else {
 963                 errno = ENOENT;
 964         }
 965 fail:
 966         if (result == NULL) {
 967                 saved_errno = errno;
 968         }
 969         TALLOC_FREE(converted);
 970         TALLOC_FREE(insert);
 971         TALLOC_FREE(slashes);
 972         TALLOC_FREE(path);
 973         if (saved_errno != 0) {
 974                 errno = saved_errno;
 975         }
 976         return result;
 977 }
 978
 979 /**
 980  * Convert from a name as handed in via the SMB layer
 981  * and a timestamp into the local path of the snapshot
 982  * of the provided file at the provided time.
 983  */
 984 static char *shadow_copy2_convert(TALLOC_CTX *mem_ctx,
 985                                   struct vfs_handle_struct *handle,
 986                                   const char *name, time_t timestamp)
 987 {
 988         return shadow_copy2_do_convert(mem_ctx, handle, name, timestamp, NULL);
 989 }
 990
 991 /*
 992   modify a sbuf return to ensure that inodes in the shadow directory
 993   are different from those in the main directory
 994  */
 995 static void convert_sbuf(vfs_handle_struct *handle, const char *fname,
 996                          SMB_STRUCT_STAT *sbuf)
 997 {
 998         struct shadow_copy2_private *priv;
 999
1000         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1001                                 return);
1002
1003         if (priv->config->fixinodes) {
1004                 /* some snapshot systems, like GPFS, return the same
1005                    device:inode for the snapshot files as the current
1006                    files. That breaks the 'restore' button in the shadow copy
1007                    GUI, as the client gets a sharing violation.
1008
1009                    This is a crude way of allowing both files to be
1010                    open at once. It has a slight chance of inode
1011                    number collision, but I can't see a better approach
1012                    without significant VFS changes
1013                 */
1014                 TDB_DATA key = { .dptr = discard_const_p(uint8_t, fname),
1015                                  .dsize = strlen(fname) };
1016                 uint32_t shash;
1017
1018                 shash = tdb_jenkins_hash(&key) & 0xFF000000;
1019                 if (shash == 0) {
1020                         shash = 1;
1021                 }
1022                 sbuf->st_ex_ino ^= shash;
1023         }
1024 }
1025
1026 static int shadow_copy2_renameat(vfs_handle_struct *handle,
1027                                 files_struct *srcfsp,
1028                                 const struct smb_filename *smb_fname_src,
1029                                 files_struct *dstfsp,
1030                                 const struct smb_filename *smb_fname_dst)
1031 {
1032         time_t timestamp_src = 0;
1033         time_t timestamp_dst = 0;
1034         char *snappath_src = NULL;
1035         char *snappath_dst = NULL;
1036
1037         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(), handle,
1038                                          smb_fname_src,
1039                                          &timestamp_src, NULL, &snappath_src,
1040                                          NULL)) {
1041                 return -1;
1042         }
1043         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(), handle,
1044                                          smb_fname_dst,
1045                                          &timestamp_dst, NULL, &snappath_dst,
1046                                          NULL)) {
1047                 return -1;
1048         }
1049         if (timestamp_src != 0) {
1050                 errno = EXDEV;
1051                 return -1;
1052         }
1053         if (timestamp_dst != 0) {
1054                 errno = EROFS;
1055                 return -1;
1056         }
1057         /*
1058          * Don't allow rename on already converted paths.
1059          */
1060         if (snappath_src != NULL) {
1061                 errno = EXDEV;
1062                 return -1;
1063         }
1064         if (snappath_dst != NULL) {
1065                 errno = EROFS;
1066                 return -1;
1067         }
1068         return SMB_VFS_NEXT_RENAMEAT(handle,
1069                         srcfsp,
1070                         smb_fname_src,
1071                         dstfsp,
1072                         smb_fname_dst);
1073 }
1074
1075 static int shadow_copy2_symlinkat(vfs_handle_struct *handle,
1076                         const struct smb_filename *link_contents,
1077                         struct files_struct *dirfsp,
1078                         const struct smb_filename *new_smb_fname)
1079 {
1080         time_t timestamp_old = 0;
1081         time_t timestamp_new = 0;
1082         char *snappath_old = NULL;
1083         char *snappath_new = NULL;
1084
1085         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
1086                                 handle,
1087                                 link_contents,
1088                                 &timestamp_old,
1089                                 NULL,
1090                                 &snappath_old,
1091                                 NULL)) {
1092                 return -1;
1093         }
1094         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
1095                                 handle,
1096                                 new_smb_fname,
1097                                 &timestamp_new,
1098                                 NULL,
1099                                 &snappath_new,
1100                                 NULL)) {
1101                 return -1;
1102         }
1103         if ((timestamp_old != 0) || (timestamp_new != 0)) {
1104                 errno = EROFS;
1105                 return -1;
1106         }
1107         /*
1108          * Don't allow symlinks on already converted paths.
1109          */
1110         if ((snappath_old != NULL) || (snappath_new != NULL)) {
1111                 errno = EROFS;
1112                 return -1;
1113         }
1114         return SMB_VFS_NEXT_SYMLINKAT(handle,
1115                                 link_contents,
1116                                 dirfsp,
1117                                 new_smb_fname);
1118 }
1119
1120 static int shadow_copy2_linkat(vfs_handle_struct *handle,
1121                         files_struct *srcfsp,
1122                         const struct smb_filename *old_smb_fname,
1123                         files_struct *dstfsp,
1124                         const struct smb_filename *new_smb_fname,
1125                         int flags)
1126 {
1127         time_t timestamp_old = 0;
1128         time_t timestamp_new = 0;
1129         char *snappath_old = NULL;
1130         char *snappath_new = NULL;
1131
1132         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
1133                                 handle,
1134                                 old_smb_fname,
1135                                 &timestamp_old,
1136                                 NULL,
1137                                 &snappath_old,
1138                                 NULL)) {
1139                 return -1;
1140         }
1141         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
1142                                 handle,
1143                                 new_smb_fname,
1144                                 &timestamp_new,
1145                                 NULL,
1146                                 &snappath_new,
1147                                 NULL)) {
1148                 return -1;
1149         }
1150         if ((timestamp_old != 0) || (timestamp_new != 0)) {
1151                 errno = EROFS;
1152                 return -1;
1153         }
1154         /*
1155          * Don't allow links on already converted paths.
1156          */
1157         if ((snappath_old != NULL) || (snappath_new != NULL)) {
1158                 errno = EROFS;
1159                 return -1;
1160         }
1161         return SMB_VFS_NEXT_LINKAT(handle,
1162                         srcfsp,
1163                         old_smb_fname,
1164                         dstfsp,
1165                         new_smb_fname,
1166                         flags);
1167 }
1168
1169 static int shadow_copy2_stat(vfs_handle_struct *handle,
1170                              struct smb_filename *smb_fname)
1171 {
1172         struct shadow_copy2_private *priv = NULL;
1173         time_t timestamp = 0;
1174         char *stripped = NULL;
1175         bool converted = false;
1176         char *abspath = NULL;
1177         char *tmp;
1178         int ret = 0;
1179
1180         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1181                                 return -1);
1182
1183         if (!shadow_copy2_strip_snapshot_converted(talloc_tos(),
1184                                                    handle,
1185                                                    smb_fname,
1186                                                    &timestamp,
1187                                                    &stripped,
1188                                                    &converted)) {
1189                 return -1;
1190         }
1191         if (timestamp == 0) {
1192                 TALLOC_FREE(stripped);
1193                 ret = SMB_VFS_NEXT_STAT(handle, smb_fname);
1194                 if (ret != 0) {
1195                         return ret;
1196                 }
1197                 if (!converted) {
1198                         return 0;
1199                 }
1200
1201                 abspath = make_path_absolute(talloc_tos(),
1202                                              priv,
1203                                              smb_fname->base_name);
1204                 if (abspath == NULL) {
1205                         return -1;
1206                 }
1207
1208                 convert_sbuf(handle, abspath, &smb_fname->st);
1209                 TALLOC_FREE(abspath);
1210                 return 0;
1211         }
1212
1213         tmp = smb_fname->base_name;
1214         smb_fname->base_name = shadow_copy2_convert(
1215                 talloc_tos(), handle, stripped, timestamp);
1216         TALLOC_FREE(stripped);
1217
1218         if (smb_fname->base_name == NULL) {
1219                 smb_fname->base_name = tmp;
1220                 return -1;
1221         }
1222
1223         ret = SMB_VFS_NEXT_STAT(handle, smb_fname);
1224         if (ret != 0) {
1225                 goto out;
1226         }
1227
1228         abspath = make_path_absolute(talloc_tos(),
1229                                      priv,
1230                                      smb_fname->base_name);
1231         if (abspath == NULL) {
1232                 ret = -1;
1233                 goto out;
1234         }
1235
1236         convert_sbuf(handle, abspath, &smb_fname->st);
1237         TALLOC_FREE(abspath);
1238
1239 out:
1240         TALLOC_FREE(smb_fname->base_name);
1241         smb_fname->base_name = tmp;
1242
1243         return ret;
1244 }
1245
1246 static int shadow_copy2_lstat(vfs_handle_struct *handle,
1247                               struct smb_filename *smb_fname)
1248 {
1249         struct shadow_copy2_private *priv = NULL;
1250         time_t timestamp = 0;
1251         char *stripped = NULL;
1252         bool converted = false;
1253         char *abspath = NULL;
1254         char *tmp;
1255         int ret = 0;
1256
1257         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1258                                 return -1);
1259
1260         if (!shadow_copy2_strip_snapshot_converted(talloc_tos(),
1261                                                    handle,
1262                                                    smb_fname,
1263                                                    &timestamp,
1264                                                    &stripped,
1265                                                    &converted)) {
1266                 return -1;
1267         }
1268         if (timestamp == 0) {
1269                 TALLOC_FREE(stripped);
1270                 ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
1271                 if (ret != 0) {
1272                         return ret;
1273                 }
1274                 if (!converted) {
1275                         return 0;
1276                 }
1277
1278                 abspath = make_path_absolute(talloc_tos(),
1279                                              priv,
1280                                              smb_fname->base_name);
1281                 if (abspath == NULL) {
1282                         return -1;
1283                 }
1284
1285                 convert_sbuf(handle, abspath, &smb_fname->st);
1286                 TALLOC_FREE(abspath);
1287                 return 0;
1288         }
1289
1290         tmp = smb_fname->base_name;
1291         smb_fname->base_name = shadow_copy2_convert(
1292                 talloc_tos(), handle, stripped, timestamp);
1293         TALLOC_FREE(stripped);
1294
1295         if (smb_fname->base_name == NULL) {
1296                 smb_fname->base_name = tmp;
1297                 return -1;
1298         }
1299
1300         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
1301         if (ret != 0) {
1302                 goto out;
1303         }
1304
1305         abspath = make_path_absolute(talloc_tos(),
1306                                      priv,
1307                                      smb_fname->base_name);
1308         if (abspath == NULL) {
1309                 ret = -1;
1310                 goto out;
1311         }
1312
1313         convert_sbuf(handle, abspath, &smb_fname->st);
1314         TALLOC_FREE(abspath);
1315
1316 out:
1317         TALLOC_FREE(smb_fname->base_name);
1318         smb_fname->base_name = tmp;
1319
1320         return ret;
1321 }
1322
1323 static int shadow_copy2_fstat(vfs_handle_struct *handle, files_struct *fsp,
1324                               SMB_STRUCT_STAT *sbuf)
1325 {
1326         struct shadow_copy2_private *priv = NULL;
1327         time_t timestamp = 0;
1328         struct smb_filename *orig_smb_fname = NULL;
1329         struct smb_filename vss_smb_fname;
1330         struct smb_filename *orig_base_smb_fname = NULL;
1331         struct smb_filename vss_base_smb_fname;
1332         char *stripped = NULL;
1333         char *abspath = NULL;
1334         bool converted = false;
1335         bool ok;
1336         int ret;
1337
1338         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1339                                 return -1);
1340
1341         ok = shadow_copy2_strip_snapshot_converted(talloc_tos(),
1342                                                    handle,
1343                                                    fsp->fsp_name,
1344                                                    &timestamp,
1345                                                    &stripped,
1346                                                    &converted);
1347         if (!ok) {
1348                 return -1;
1349         }
1350
1351         if (timestamp == 0) {
1352                 TALLOC_FREE(stripped);
1353                 ret = SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
1354                 if (ret != 0) {
1355                         return ret;
1356                 }
1357                 if (!converted) {
1358                         return 0;
1359                 }
1360
1361                 abspath = make_path_absolute(talloc_tos(),
1362                                              priv,
1363                                              fsp->fsp_name->base_name);
1364                 if (abspath == NULL) {
1365                         return -1;
1366                 }
1367
1368                 convert_sbuf(handle, abspath, sbuf);
1369                 TALLOC_FREE(abspath);
1370                 return 0;
1371         }
1372
1373         vss_smb_fname = *fsp->fsp_name;
1374         vss_smb_fname.base_name = shadow_copy2_convert(talloc_tos(),
1375                                                        handle,
1376                                                        stripped,
1377                                                        timestamp);
1378         TALLOC_FREE(stripped);
1379         if (vss_smb_fname.base_name == NULL) {
1380                 return -1;
1381         }
1382
1383         orig_smb_fname = fsp->fsp_name;
1384         fsp->fsp_name = &vss_smb_fname;
1385
1386         if (fsp_is_alternate_stream(fsp)) {
1387                 vss_base_smb_fname = *fsp->base_fsp->fsp_name;
1388                 vss_base_smb_fname.base_name = vss_smb_fname.base_name;
1389                 orig_base_smb_fname = fsp->base_fsp->fsp_name;
1390                 fsp->base_fsp->fsp_name = &vss_base_smb_fname;
1391         }
1392
1393         ret = SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
1394         if (ret != 0) {
1395                 goto out;
1396         }
1397
1398         abspath = make_path_absolute(talloc_tos(),
1399                                      priv,
1400                                      fsp->fsp_name->base_name);
1401         if (abspath == NULL) {
1402                 ret = -1;
1403                 goto out;
1404         }
1405
1406         convert_sbuf(handle, abspath, sbuf);
1407         TALLOC_FREE(abspath);
1408
1409 out:
1410         fsp->fsp_name = orig_smb_fname;
1411         if (fsp_is_alternate_stream(fsp)) {
1412                 fsp->base_fsp->fsp_name = orig_base_smb_fname;
1413         }
1414
1415         return ret;
1416 }
1417
1418 static int shadow_copy2_fstatat(
1419         struct vfs_handle_struct *handle,
1420         const struct files_struct *dirfsp,
1421         const struct smb_filename *smb_fname_in,
1422         SMB_STRUCT_STAT *sbuf,
1423         int flags)
1424 {
1425         struct shadow_copy2_private *priv = NULL;
1426         struct smb_filename *smb_fname = NULL;
1427         time_t timestamp = 0;
1428         char *stripped = NULL;
1429         char *abspath = NULL;
1430         bool converted = false;
1431         int ret;
1432         bool ok;
1433
1434         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1435                                 return -1);
1436
1437         smb_fname = full_path_from_dirfsp_atname(talloc_tos(),
1438                                                  dirfsp,
1439                                                  smb_fname_in);
1440         if (smb_fname == NULL) {
1441                 errno = ENOMEM;
1442                 return -1;
1443         }
1444
1445         ok = shadow_copy2_strip_snapshot_converted(talloc_tos(),
1446                                                    handle,
1447                                                    smb_fname,
1448                                                    &timestamp,
1449                                                    &stripped,
1450                                                    &converted);
1451         if (!ok) {
1452                 return -1;
1453         }
1454         if (timestamp == 0) {
1455                 TALLOC_FREE(stripped);
1456                 ret = SMB_VFS_NEXT_FSTATAT(
1457                         handle, dirfsp, smb_fname_in, sbuf, flags);
1458                 if (ret != 0) {
1459                         return ret;
1460                 }
1461                 if (!converted) {
1462                         return 0;
1463                 }
1464
1465                 abspath = make_path_absolute(
1466                         talloc_tos(), priv, smb_fname->base_name);
1467                 if (abspath == NULL) {
1468                         errno = ENOMEM;
1469                         return -1;
1470                 }
1471
1472                 convert_sbuf(handle, abspath, sbuf);
1473                 TALLOC_FREE(abspath);
1474                 return 0;
1475         }
1476
1477         smb_fname->base_name = shadow_copy2_convert(
1478                 smb_fname, handle, stripped, timestamp);
1479         TALLOC_FREE(stripped);
1480         if (smb_fname->base_name == NULL) {
1481                 TALLOC_FREE(smb_fname);
1482                 errno = ENOMEM;
1483                 return -1;
1484         }
1485
1486         ret = SMB_VFS_NEXT_FSTATAT(handle,
1487                                    dirfsp,
1488                                    smb_fname,
1489                                    sbuf,
1490                                    flags);
1491         if (ret != 0) {
1492                 int saved_errno = errno;
1493                 TALLOC_FREE(smb_fname);
1494                 errno = saved_errno;
1495                 return -1;
1496         }
1497
1498         abspath = make_path_absolute(
1499                 talloc_tos(), priv, smb_fname->base_name);
1500         if (abspath == NULL) {
1501                 TALLOC_FREE(smb_fname);
1502                 errno = ENOMEM;
1503                 return -1;
1504         }
1505
1506         convert_sbuf(handle, abspath, sbuf);
1507         TALLOC_FREE(abspath);
1508
1509         TALLOC_FREE(smb_fname);
1510
1511         return 0;
1512 }
1513
1514 static struct smb_filename *shadow_copy2_openat_name(
1515         TALLOC_CTX *mem_ctx,
1516         const struct files_struct *dirfsp,
1517         const struct files_struct *fsp,
1518         const struct smb_filename *smb_fname_in)
1519 {
1520         struct smb_filename *result = NULL;
1521
1522         if (fsp->base_fsp != NULL) {
1523                 struct smb_filename *base_fname = fsp->base_fsp->fsp_name;
1524
1525                 SMB_ASSERT(is_named_stream(smb_fname_in));
1526
1527                 result = synthetic_smb_fname(
1528                         mem_ctx,
1529                         base_fname->base_name,
1530                         smb_fname_in->stream_name,
1531                         &smb_fname_in->st,
1532                         smb_fname_in->twrp,
1533                         smb_fname_in->flags);
1534         } else {
1535                 result = full_path_from_dirfsp_atname(
1536                         mem_ctx, dirfsp, smb_fname_in);
1537         }
1538
1539         return result;
1540 }
1541
1542 static int shadow_copy2_openat(vfs_handle_struct *handle,
1543                                const struct files_struct *dirfsp,
1544                                const struct smb_filename *smb_fname_in,
1545                                struct files_struct *fsp,
1546                                const struct vfs_open_how *_how)
1547 {
1548         struct vfs_open_how how = *_how;
1549         struct smb_filename *smb_fname = NULL;
1550         time_t timestamp = 0;
1551         char *stripped = NULL;
1552         bool is_converted = false;
1553         int saved_errno = 0;
1554         int ret;
1555         bool ok;
1556
1557         if (how.resolve != 0) {
1558                 errno = ENOSYS;
1559                 return -1;
1560         }
1561
1562         smb_fname = shadow_copy2_openat_name(
1563                 talloc_tos(), dirfsp, fsp, smb_fname_in);
1564         if (smb_fname == NULL) {
1565                 errno = ENOMEM;
1566                 return -1;
1567         }
1568
1569         ok = shadow_copy2_strip_snapshot_converted(talloc_tos(),
1570                                                    handle,
1571                                                    smb_fname,
1572                                                    &timestamp,
1573                                                    &stripped,
1574                                                    &is_converted);
1575         if (!ok) {
1576                 return -1;
1577         }
1578         if (timestamp == 0) {
1579                 if (is_converted) {
1580                         /*
1581                          * Just pave over the user requested mode and use
1582                          * O_RDONLY. Later attempts by the client to write on
1583                          * the handle will fail in the pwrite() syscall with
1584                          * EINVAL which we carefully map to EROFS. In sum, this
1585                          * matches Windows behaviour.
1586                          */
1587                         how.flags &= ~(O_WRONLY | O_RDWR | O_CREAT);
1588                 }
1589                 return SMB_VFS_NEXT_OPENAT(handle,
1590                                            dirfsp,
1591                                            smb_fname_in,
1592                                            fsp,
1593                                            &how);
1594         }
1595
1596         smb_fname->base_name = shadow_copy2_convert(smb_fname,
1597                                                handle,
1598                                                stripped,
1599                                                timestamp);
1600         if (smb_fname->base_name == NULL) {
1601                 int err = errno;
1602                 TALLOC_FREE(stripped);
1603                 TALLOC_FREE(smb_fname);
1604                 errno = err;
1605                 return -1;
1606         }
1607         TALLOC_FREE(stripped);
1608
1609         /*
1610          * Just pave over the user requested mode and use O_RDONLY. Later
1611          * attempts by the client to write on the handle will fail in the
1612          * pwrite() syscall with EINVAL which we carefully map to EROFS. In sum,
1613          * this matches Windows behaviour.
1614          */
1615         how.flags &= ~(O_WRONLY | O_RDWR | O_CREAT);
1616
1617         ret = SMB_VFS_NEXT_OPENAT(handle,
1618                                   dirfsp,
1619                                   smb_fname,
1620                                   fsp,
1621                                   &how);
1622         if (ret == -1) {
1623                 saved_errno = errno;
1624         }
1625
1626         TALLOC_FREE(smb_fname);
1627
1628         if (saved_errno != 0) {
1629                 errno = saved_errno;
1630         }
1631         return ret;
1632 }
1633
1634 static int shadow_copy2_unlinkat(vfs_handle_struct *handle,
1635                         struct files_struct *dirfsp,
1636                         const struct smb_filename *smb_fname,
1637                         int flags)
1638 {
1639         time_t timestamp = 0;
1640
1641         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1642                                          smb_fname,
1643                                          &timestamp, NULL)) {
1644                 return -1;
1645         }
1646         if (timestamp != 0) {
1647                 errno = EROFS;
1648                 return -1;
1649         }
1650         return SMB_VFS_NEXT_UNLINKAT(handle,
1651                         dirfsp,
1652                         smb_fname,
1653                         flags);
1654 }
1655
1656 static int shadow_copy2_fchmod(vfs_handle_struct *handle,
1657                        struct files_struct *fsp,
1658                        mode_t mode)
1659 {
1660         time_t timestamp = 0;
1661         const struct smb_filename *smb_fname = NULL;
1662
1663         smb_fname = fsp->fsp_name;
1664         if (!shadow_copy2_strip_snapshot(talloc_tos(),
1665                                         handle,
1666                                         smb_fname,
1667                                         &timestamp,
1668                                         NULL)) {
1669                 return -1;
1670         }
1671         if (timestamp != 0) {
1672                 errno = EROFS;
1673                 return -1;
1674         }
1675         return SMB_VFS_NEXT_FCHMOD(handle, fsp, mode);
1676 }
1677
1678 static void store_cwd_data(vfs_handle_struct *handle,
1679                                 const char *connectpath)
1680 {
1681         struct shadow_copy2_private *priv = NULL;
1682         struct smb_filename *cwd_fname = NULL;
1683
1684         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1685                                 return);
1686
1687         TALLOC_FREE(priv->shadow_cwd);
1688         cwd_fname = SMB_VFS_NEXT_GETWD(handle, talloc_tos());
1689         if (cwd_fname == NULL) {
1690                 smb_panic("getwd failed\n");
1691         }
1692         DBG_DEBUG("shadow cwd = %s\n", cwd_fname->base_name);
1693         priv->shadow_cwd = talloc_strdup(priv, cwd_fname->base_name);
1694         TALLOC_FREE(cwd_fname);
1695         if (priv->shadow_cwd == NULL) {
1696                 smb_panic("talloc failed\n");
1697         }
1698         TALLOC_FREE(priv->shadow_connectpath);
1699         if (connectpath) {
1700                 DBG_DEBUG("shadow connectpath = %s\n", connectpath);
1701                 priv->shadow_connectpath = talloc_strdup(priv, connectpath);
1702                 if (priv->shadow_connectpath == NULL) {
1703                         smb_panic("talloc failed\n");
1704                 }
1705         }
1706 }
1707
1708 static int shadow_copy2_chdir(vfs_handle_struct *handle,
1709                                const struct smb_filename *smb_fname)
1710 {
1711         time_t timestamp = 0;
1712         char *stripped = NULL;
1713         char *snappath = NULL;
1714         int ret = -1;
1715         int saved_errno = 0;
1716         char *conv = NULL;
1717         size_t rootpath_len = 0;
1718         struct smb_filename *conv_smb_fname = NULL;
1719
1720         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
1721                                         handle,
1722                                         smb_fname,
1723                                         &timestamp,
1724                                         &stripped,
1725                                         &snappath,
1726                                         NULL)) {
1727                 return -1;
1728         }
1729         if (stripped != NULL) {
1730                 conv = shadow_copy2_do_convert(talloc_tos(),
1731                                                 handle,
1732                                                 stripped,
1733                                                 timestamp,
1734                                                 &rootpath_len);
1735                 TALLOC_FREE(stripped);
1736                 if (conv == NULL) {
1737                         return -1;
1738                 }
1739                 conv_smb_fname = synthetic_smb_fname(talloc_tos(),
1740                                         conv,
1741                                         NULL,
1742                                         NULL,
1743                                         0,
1744                                         smb_fname->flags);
1745         } else {
1746                 conv_smb_fname = cp_smb_filename(talloc_tos(), smb_fname);
1747         }
1748
1749         if (conv_smb_fname == NULL) {
1750                 TALLOC_FREE(conv);
1751                 errno = ENOMEM;
1752                 return -1;
1753         }
1754
1755         ret = SMB_VFS_NEXT_CHDIR(handle, conv_smb_fname);
1756         if (ret == -1) {
1757                 saved_errno = errno;
1758         }
1759
1760         if (ret == 0) {
1761                 if (conv != NULL && rootpath_len != 0) {
1762                         conv[rootpath_len] = '\0';
1763                 } else if (snappath != 0) {
1764                         TALLOC_FREE(conv);
1765                         conv = snappath;
1766                 }
1767                 store_cwd_data(handle, conv);
1768         }
1769
1770         TALLOC_FREE(stripped);
1771         TALLOC_FREE(conv);
1772         TALLOC_FREE(conv_smb_fname);
1773
1774         if (saved_errno != 0) {
1775                 errno = saved_errno;
1776         }
1777         return ret;
1778 }
1779
1780 static int shadow_copy2_fntimes(vfs_handle_struct *handle,
1781                                 files_struct *fsp,
1782                                 struct smb_file_time *ft)
1783 {
1784         time_t timestamp = 0;
1785
1786         if (!shadow_copy2_strip_snapshot(talloc_tos(),
1787                                          handle,
1788                                          fsp->fsp_name,
1789                                          &timestamp,
1790                                          NULL)) {
1791                 return -1;
1792         }
1793         if (timestamp != 0) {
1794                 errno = EROFS;
1795                 return -1;
1796         }
1797         return SMB_VFS_NEXT_FNTIMES(handle, fsp, ft);
1798 }
1799
1800 static int shadow_copy2_readlinkat(vfs_handle_struct *handle,
1801                                 const struct files_struct *dirfsp,
1802                                 const struct smb_filename *smb_fname,
1803                                 char *buf,
1804                                 size_t bufsiz)
1805 {
1806         time_t timestamp = 0;
1807         char *stripped = NULL;
1808         int saved_errno = 0;
1809         int ret;
1810         struct smb_filename *full_fname = NULL;
1811         struct smb_filename *conv = NULL;
1812
1813         full_fname = full_path_from_dirfsp_atname(talloc_tos(),
1814                                                   dirfsp,
1815                                                   smb_fname);
1816         if (full_fname == NULL) {
1817                 errno = ENOMEM;
1818                 return -1;
1819         }
1820
1821         if (!shadow_copy2_strip_snapshot(talloc_tos(),
1822                                         handle,
1823                                         full_fname,
1824                                         &timestamp,
1825                                         &stripped)) {
1826                 TALLOC_FREE(full_fname);
1827                 return -1;
1828         }
1829
1830         if (timestamp == 0) {
1831                 TALLOC_FREE(full_fname);
1832                 TALLOC_FREE(stripped);
1833                 return SMB_VFS_NEXT_READLINKAT(handle,
1834                                 dirfsp,
1835                                 smb_fname,
1836                                 buf,
1837                                 bufsiz);
1838         }
1839         conv = cp_smb_filename(talloc_tos(), full_fname);
1840         if (conv == NULL) {
1841                 TALLOC_FREE(full_fname);
1842                 TALLOC_FREE(stripped);
1843                 errno = ENOMEM;
1844                 return -1;
1845         }
1846         TALLOC_FREE(full_fname);
1847         conv->base_name = shadow_copy2_convert(
1848                 conv, handle, stripped, timestamp);
1849         TALLOC_FREE(stripped);
1850         if (conv->base_name == NULL) {
1851                 return -1;
1852         }
1853         ret = SMB_VFS_NEXT_READLINKAT(handle,
1854                                 handle->conn->cwd_fsp,
1855                                 conv,
1856                                 buf,
1857                                 bufsiz);
1858         if (ret == -1) {
1859                 saved_errno = errno;
1860         }
1861         TALLOC_FREE(conv);
1862         if (saved_errno != 0) {
1863                 errno = saved_errno;
1864         }
1865         return ret;
1866 }
1867
1868 static int shadow_copy2_mknodat(vfs_handle_struct *handle,
1869                         files_struct *dirfsp,
1870                         const struct smb_filename *smb_fname,
1871                         mode_t mode,
1872                         SMB_DEV_T dev)
1873 {
1874         time_t timestamp = 0;
1875
1876         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1877                                          smb_fname,
1878                                          &timestamp, NULL)) {
1879                 return -1;
1880         }
1881         if (timestamp != 0) {
1882                 errno = EROFS;
1883                 return -1;
1884         }
1885         return SMB_VFS_NEXT_MKNODAT(handle,
1886                         dirfsp,
1887                         smb_fname,
1888                         mode,
1889                         dev);
1890 }
1891
1892 static struct smb_filename *shadow_copy2_realpath(vfs_handle_struct *handle,
1893                                 TALLOC_CTX *ctx,
1894                                 const struct smb_filename *smb_fname)
1895 {
1896         time_t timestamp = 0;
1897         char *stripped = NULL;
1898         struct smb_filename *result_fname = NULL;
1899         struct smb_filename *conv_fname = NULL;
1900         int saved_errno = 0;
1901
1902         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1903                                 smb_fname,
1904                                 &timestamp, &stripped)) {
1905                 goto done;
1906         }
1907         if (timestamp == 0) {
1908                 return SMB_VFS_NEXT_REALPATH(handle, ctx, smb_fname);
1909         }
1910
1911         conv_fname = cp_smb_filename(talloc_tos(), smb_fname);
1912         if (conv_fname == NULL) {
1913                 goto done;
1914         }
1915         conv_fname->base_name = shadow_copy2_convert(
1916                 conv_fname, handle, stripped, timestamp);
1917         if (conv_fname->base_name == NULL) {
1918                 goto done;
1919         }
1920
1921         result_fname = SMB_VFS_NEXT_REALPATH(handle, ctx, conv_fname);
1922
1923 done:
1924         if (result_fname == NULL) {
1925                 saved_errno = errno;
1926         }
1927         TALLOC_FREE(conv_fname);
1928         TALLOC_FREE(stripped);
1929         if (saved_errno != 0) {
1930                 errno = saved_errno;
1931         }
1932         return result_fname;
1933 }
1934
1935 /**
1936  * Check whether a given directory contains a
1937  * snapshot directory as direct subdirectory.
1938  * If yes, return the path of the snapshot-subdir,
1939  * otherwise return NULL.
1940  */
1941 static char *have_snapdir(struct vfs_handle_struct *handle,
1942                           TALLOC_CTX *mem_ctx,
1943                           const char *path)
1944 {
1945         struct smb_filename smb_fname;
1946         int ret;
1947         struct shadow_copy2_private *priv;
1948
1949         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1950                                 return NULL);
1951
1952         smb_fname = (struct smb_filename) {
1953                 .base_name = talloc_asprintf(
1954                         mem_ctx, "%s/%s", path, priv->config->snapdir),
1955         };
1956         if (smb_fname.base_name == NULL) {
1957                 return NULL;
1958         }
1959
1960         ret = SMB_VFS_NEXT_STAT(handle, &smb_fname);
1961         if ((ret == 0) && (S_ISDIR(smb_fname.st.st_ex_mode))) {
1962                 return smb_fname.base_name;
1963         }
1964         TALLOC_FREE(smb_fname.base_name);
1965         return NULL;
1966 }
1967
1968 /**
1969  * Find the snapshot directory (if any) for the given
1970  * filename (which is relative to the share).
1971  */
1972 static const char *shadow_copy2_find_snapdir(TALLOC_CTX *mem_ctx,
1973                                              struct vfs_handle_struct *handle,
1974                                              struct smb_filename *smb_fname)
1975 {
1976         char *path, *p;
1977         const char *snapdir;
1978         struct shadow_copy2_config *config;
1979         struct shadow_copy2_private *priv;
1980
1981         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1982                                 return NULL);
1983
1984         config = priv->config;
1985
1986         /*
1987          * If the non-snapdisrseverywhere mode, we should not search!
1988          */
1989         if (!config->snapdirseverywhere) {
1990                 return config->snapshot_basepath;
1991         }
1992
1993         path = talloc_asprintf(mem_ctx, "%s/%s",
1994                                handle->conn->connectpath,
1995                                smb_fname->base_name);
1996         if (path == NULL) {
1997                 return NULL;
1998         }
1999
2000         snapdir = have_snapdir(handle, talloc_tos(), path);
2001         if (snapdir != NULL) {
2002                 TALLOC_FREE(path);
2003                 return snapdir;
2004         }
2005
2006         while ((p = strrchr(path, '/')) && (p > path)) {
2007
2008                 p[0] = '\0';
2009
2010                 snapdir = have_snapdir(handle, talloc_tos(), path);
2011                 if (snapdir != NULL) {
2012                         TALLOC_FREE(path);
2013                         return snapdir;
2014                 }
2015         }
2016         TALLOC_FREE(path);
2017         return NULL;
2018 }
2019
2020 static bool shadow_copy2_snapshot_to_gmt(vfs_handle_struct *handle,
2021                                          const char *name,
2022                                          char *gmt, size_t gmt_len)
2023 {
2024         struct tm timestamp = { .tm_sec = 0, };
2025         time_t timestamp_t;
2026         unsigned long int timestamp_long;
2027         const char *fmt;
2028         struct shadow_copy2_config *config;
2029         struct shadow_copy2_private *priv;
2030         char *tmpstr = NULL;
2031         char *tmp = NULL;
2032         bool converted = false;
2033         int ret = -1;
2034
2035         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
2036                                 return NULL);
2037
2038         config = priv->config;
2039
2040         fmt = config->gmt_format;
2041
2042         /*
2043          * If regex is provided, then we will have to parse the
2044          * filename which will contain both the prefix and the time format.
2045          * e.g. <prefix><delimiter><time_format>
2046          */
2047         if (priv->snaps->regex != NULL) {
2048                 tmpstr = talloc_strdup(talloc_tos(), name);
2049                 /* point "name" to the time format */
2050                 name = strstr(name, priv->config->delimiter);
2051                 if (name == NULL) {
2052                         goto done;
2053                 }
2054                 /* Extract the prefix */
2055                 tmp = strstr(tmpstr, priv->config->delimiter);
2056                 if (tmp == NULL) {
2057                         goto done;
2058                 }
2059                 *tmp = '\0';
2060
2061                 /* Parse regex */
2062                 ret = regexec(priv->snaps->regex, tmpstr, 0, NULL, 0);
2063                 if (ret) {
2064                         DBG_DEBUG("shadow_copy2_snapshot_to_gmt: "
2065                                   "no regex match for %s\n", tmpstr);
2066                         goto done;
2067                 }
2068         }
2069
2070         if (config->use_sscanf) {
2071                 if (sscanf(name, fmt, &timestamp_long) != 1) {
2072                         DEBUG(10, ("shadow_copy2_snapshot_to_gmt: "
2073                                    "no sscanf match %s: %s\n",
2074                                    fmt, name));
2075                         goto done;
2076                 }
2077                 timestamp_t = timestamp_long;
2078                 gmtime_r(&timestamp_t, &timestamp);
2079         } else {
2080                 if (strptime(name, fmt, &timestamp) == NULL) {
2081                         DEBUG(10, ("shadow_copy2_snapshot_to_gmt: "
2082                                    "no match %s: %s\n",
2083                                    fmt, name));
2084                         goto done;
2085                 }
2086                 DEBUG(10, ("shadow_copy2_snapshot_to_gmt: match %s: %s\n",
2087                            fmt, name));
2088
2089                 if (config->use_localtime) {
2090                         timestamp.tm_isdst = -1;
2091                         timestamp_t = mktime(&timestamp);
2092                         gmtime_r(&timestamp_t, &timestamp);
2093                 }
2094         }
2095
2096         strftime(gmt, gmt_len, GMT_FORMAT, &timestamp);
2097         converted = true;
2098
2099 done:
2100         TALLOC_FREE(tmpstr);
2101         return converted;
2102 }
2103
2104 static int shadow_copy2_label_cmp_asc(const void *x, const void *y)
2105 {
2106         return strncmp((const char *)x, (const char *)y, sizeof(SHADOW_COPY_LABEL));
2107 }
2108
2109 static int shadow_copy2_label_cmp_desc(const void *x, const void *y)
2110 {
2111         return -strncmp((const char *)x, (const char *)y, sizeof(SHADOW_COPY_LABEL));
2112 }
2113
2114 /*
2115   sort the shadow copy data in ascending or descending order
2116  */
2117 static void shadow_copy2_sort_data(vfs_handle_struct *handle,
2118                                    struct shadow_copy_data *shadow_copy2_data)
2119 {
2120         int (*cmpfunc)(const void *, const void *);
2121         const char *sort;
2122         struct shadow_copy2_private *priv;
2123
2124         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
2125                                 return);
2126
2127         sort = priv->config->sort_order;
2128         if (sort == NULL) {
2129                 return;
2130         }
2131
2132         if (strcmp(sort, "asc") == 0) {
2133                 cmpfunc = shadow_copy2_label_cmp_asc;
2134         } else if (strcmp(sort, "desc") == 0) {
2135                 cmpfunc = shadow_copy2_label_cmp_desc;
2136         } else {
2137                 return;
2138         }
2139
2140         if (shadow_copy2_data && shadow_copy2_data->num_volumes > 0 &&
2141             shadow_copy2_data->labels)
2142         {
2143                 TYPESAFE_QSORT(shadow_copy2_data->labels,
2144                                shadow_copy2_data->num_volumes,
2145                                cmpfunc);
2146         }
2147 }
2148
2149 static int shadow_copy2_get_shadow_copy_data(
2150         vfs_handle_struct *handle, files_struct *fsp,
2151         struct shadow_copy_data *shadow_copy2_data,
2152         bool labels)
2153 {
2154         DIR *p = NULL;
2155         const char *snapdir;
2156         struct smb_filename *snapdir_smb_fname = NULL;
2157         struct files_struct *dirfsp = NULL;
2158         struct files_struct *fspcwd = NULL;
2159         struct dirent *d;
2160         TALLOC_CTX *tmp_ctx = talloc_stackframe();
2161         struct shadow_copy2_private *priv = NULL;
2162         struct shadow_copy2_snapentry *tmpentry = NULL;
2163         bool get_snaplist = false;
2164         struct vfs_open_how how = {
2165                 .flags = O_RDONLY, .mode = 0,
2166         };
2167         int fd;
2168         int ret = -1;
2169         NTSTATUS status;
2170         int saved_errno = 0;
2171
2172         snapdir = shadow_copy2_find_snapdir(tmp_ctx, handle, fsp->fsp_name);
2173         if (snapdir == NULL) {
2174                 DEBUG(0,("shadow:snapdir not found for %s in get_shadow_copy_data\n",
2175                          handle->conn->connectpath));
2176                 errno = EINVAL;
2177                 goto done;
2178         }
2179
2180         snapdir_smb_fname = synthetic_smb_fname(talloc_tos(),
2181                                         snapdir,
2182                                         NULL,
2183                                         NULL,
2184                                         0,
2185                                         fsp->fsp_name->flags);
2186         if (snapdir_smb_fname == NULL) {
2187                 errno = ENOMEM;
2188                 goto done;
2189         }
2190
2191         status = create_internal_dirfsp(handle->conn,
2192                                         snapdir_smb_fname,
2193                                         &dirfsp);
2194         if (!NT_STATUS_IS_OK(status)) {
2195                 DBG_WARNING("create_internal_dir_fsp() failed for '%s'"
2196                             " - %s\n", snapdir, nt_errstr(status));
2197                 errno = ENOSYS;
2198                 goto done;
2199         }
2200
2201         status = vfs_at_fspcwd(talloc_tos(), handle->conn, &fspcwd);
2202         if (!NT_STATUS_IS_OK(status)) {
2203                 errno = ENOMEM;
2204                 goto done;
2205         }
2206
2207 #ifdef O_DIRECTORY
2208         how.flags |= O_DIRECTORY;
2209 #endif
2210
2211         fd = SMB_VFS_NEXT_OPENAT(handle,
2212                                  fspcwd,
2213                                  snapdir_smb_fname,
2214                                  dirfsp,
2215                                  &how);
2216         if (fd == -1) {
2217                 DBG_WARNING("SMB_VFS_NEXT_OPEN failed for '%s'"
2218                             " - %s\n", snapdir, strerror(errno));
2219                 errno = ENOSYS;
2220                 goto done;
2221         }
2222         fsp_set_fd(dirfsp, fd);
2223
2224         /* Now we have the handle, check access here. */
2225         status = smbd_check_access_rights_fsp(fspcwd,
2226                                         dirfsp,
2227                                         false,
2228                                         SEC_DIR_LIST);
2229         if (!NT_STATUS_IS_OK(status)) {
2230                 DBG_ERR("user does not have list permission "
2231                         "on snapdir %s\n",
2232                         fsp_str_dbg(dirfsp));
2233                 errno = EACCES;
2234                 goto done;
2235         }
2236
2237         p = SMB_VFS_NEXT_FDOPENDIR(handle, dirfsp, NULL, 0);
2238         if (!p) {
2239                 DBG_NOTICE("shadow_copy2: SMB_VFS_NEXT_FDOPENDIR() failed for '%s'"
2240                            " - %s\n", snapdir, strerror(errno));
2241                 errno = ENOSYS;
2242                 goto done;
2243         }
2244
2245         if (shadow_copy2_data != NULL) {
2246                 shadow_copy2_data->num_volumes = 0;
2247                 shadow_copy2_data->labels      = NULL;
2248         }
2249
2250         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
2251                                 goto done);
2252
2253         /*
2254          * Normally this function is called twice once with labels = false and
2255          * then with labels = true. When labels is false it will return the
2256          * number of volumes so that the caller can allocate memory for that
2257          * many labels. Therefore to eliminate snaplist both the times it is
2258          * good to check if labels is set or not.
2259          *
2260          * shadow_copy2_data is NULL when we only want to update the list and
2261          * don't want any labels.
2262          */
2263         if ((priv->snaps->regex != NULL) && (labels || shadow_copy2_data == NULL)) {
2264                 get_snaplist = true;
2265                 /* Reset the global snaplist */
2266                 shadow_copy2_delete_snaplist(priv);
2267
2268                 /* Set the current time as snaplist update time */
2269                 time(&(priv->snaps->fetch_time));
2270         }
2271
2272         while ((d = SMB_VFS_NEXT_READDIR(handle, dirfsp, p, NULL))) {
2273                 char snapshot[GMT_NAME_LEN+1];
2274                 SHADOW_COPY_LABEL *tlabels;
2275
2276                 /*
2277                  * ignore names not of the right form in the snapshot
2278                  * directory
2279                  */
2280                 if (!shadow_copy2_snapshot_to_gmt(
2281                             handle, d->d_name,
2282                             snapshot, sizeof(snapshot))) {
2283
2284                         DEBUG(6, ("shadow_copy2_get_shadow_copy_data: "
2285                                   "ignoring %s\n", d->d_name));
2286                         continue;
2287                 }
2288                 DEBUG(6,("shadow_copy2_get_shadow_copy_data: %s -> %s\n",
2289                          d->d_name, snapshot));
2290
2291                 if (get_snaplist) {
2292                         /*
2293                          * Create a snap entry for each successful
2294                          * pattern match.
2295                          */
2296                         tmpentry = shadow_copy2_create_snapentry(priv);
2297                         if (tmpentry == NULL) {
2298                                 DBG_ERR("talloc_zero() failed\n");
2299                                 goto done;
2300                         }
2301                         tmpentry->snapname = talloc_strdup(tmpentry, d->d_name);
2302                         tmpentry->time_fmt = talloc_strdup(tmpentry, snapshot);
2303                 }
2304
2305                 if (shadow_copy2_data == NULL) {
2306                         continue;
2307                 }
2308
2309                 if (!labels) {
2310                         /* the caller doesn't want the labels */
2311                         shadow_copy2_data->num_volumes++;
2312                         continue;
2313                 }
2314
2315                 tlabels = talloc_realloc(shadow_copy2_data,
2316                                          shadow_copy2_data->labels,
2317                                          SHADOW_COPY_LABEL,
2318                                          shadow_copy2_data->num_volumes+1);
2319                 if (tlabels == NULL) {
2320                         DEBUG(0,("shadow_copy2: out of memory\n"));
2321                         goto done;
2322                 }
2323
2324                 strlcpy(tlabels[shadow_copy2_data->num_volumes], snapshot,
2325                         sizeof(*tlabels));
2326
2327                 shadow_copy2_data->num_volumes++;
2328                 shadow_copy2_data->labels = tlabels;
2329         }
2330
2331         shadow_copy2_sort_data(handle, shadow_copy2_data);
2332         ret = 0;
2333
2334 done:
2335         if (ret != 0) {
2336                 saved_errno = errno;
2337         }
2338         TALLOC_FREE(fspcwd );
2339         if (p != NULL) {
2340                 SMB_VFS_NEXT_CLOSEDIR(handle, p);
2341                 p = NULL;
2342                 if (dirfsp != NULL) {
2343                         /*
2344                          * VFS_CLOSEDIR implicitly
2345                          * closed the associated fd.
2346                          */
2347                         fsp_set_fd(dirfsp, -1);
2348                 }
2349         }
2350         if (dirfsp != NULL) {
2351                 fd_close(dirfsp);
2352                 file_free(NULL, dirfsp);
2353         }
2354         TALLOC_FREE(tmp_ctx);
2355         if (saved_errno != 0) {
2356                 errno = saved_errno;
2357         }
2358         return ret;
2359 }
2360
2361 static int shadow_copy2_mkdirat(vfs_handle_struct *handle,
2362                                 struct files_struct *dirfsp,
2363                                 const struct smb_filename *smb_fname,
2364                                 mode_t mode)
2365 {
2366         struct smb_filename *full_fname = NULL;
2367         time_t timestamp = 0;
2368
2369         full_fname = full_path_from_dirfsp_atname(talloc_tos(),
2370                                                   dirfsp,
2371                                                   smb_fname);
2372         if (full_fname == NULL) {
2373                 errno = ENOMEM;
2374                 return -1;
2375         }
2376
2377         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2378                                         handle,
2379                                         full_fname,
2380                                         &timestamp,
2381                                         NULL)) {
2382                 return -1;
2383         }
2384         TALLOC_FREE(full_fname);
2385         if (timestamp != 0) {
2386                 errno = EROFS;
2387                 return -1;
2388         }
2389         return SMB_VFS_NEXT_MKDIRAT(handle,
2390                         dirfsp,
2391                         smb_fname,
2392                         mode);
2393 }
2394
2395 static int shadow_copy2_fchflags(vfs_handle_struct *handle,
2396                                 struct files_struct *fsp,
2397                                 unsigned int flags)
2398 {
2399         time_t timestamp = 0;
2400
2401         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2402                                         handle,
2403                                         fsp->fsp_name,
2404                                         &timestamp,
2405                                         NULL)) {
2406                 return -1;
2407         }
2408         if (timestamp != 0) {
2409                 errno = EROFS;
2410                 return -1;
2411         }
2412         return SMB_VFS_NEXT_FCHFLAGS(handle, fsp, flags);
2413 }
2414
2415 static int shadow_copy2_fsetxattr(struct vfs_handle_struct *handle,
2416                                  struct files_struct *fsp,
2417                                  const char *aname, const void *value,
2418                                  size_t size, int flags)
2419 {
2420         time_t timestamp = 0;
2421         const struct smb_filename *smb_fname = NULL;
2422
2423         smb_fname = fsp->fsp_name;
2424         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2425                                 handle,
2426                                 smb_fname,
2427                                 &timestamp,
2428                                 NULL)) {
2429                 return -1;
2430         }
2431         if (timestamp != 0) {
2432                 errno = EROFS;
2433                 return -1;
2434         }
2435         return SMB_VFS_NEXT_FSETXATTR(handle, fsp,
2436                                 aname, value, size, flags);
2437 }
2438
2439 static NTSTATUS shadow_copy2_create_dfs_pathat(struct vfs_handle_struct *handle,
2440                                 struct files_struct *dirfsp,
2441                                 const struct smb_filename *smb_fname,
2442                                 const struct referral *reflist,
2443                                 size_t referral_count)
2444 {
2445         time_t timestamp = 0;
2446
2447         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2448                                         handle,
2449                                         smb_fname,
2450                                         &timestamp,
2451                                         NULL)) {
2452                 return NT_STATUS_NO_MEMORY;
2453         }
2454         if (timestamp != 0) {
2455                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
2456         }
2457         return SMB_VFS_NEXT_CREATE_DFS_PATHAT(handle,
2458                         dirfsp,
2459                         smb_fname,
2460                         reflist,
2461                         referral_count);
2462 }
2463
2464 static NTSTATUS shadow_copy2_read_dfs_pathat(struct vfs_handle_struct *handle,
2465                                 TALLOC_CTX *mem_ctx,
2466                                 struct files_struct *dirfsp,
2467                                 struct smb_filename *smb_fname,
2468                                 struct referral **ppreflist,
2469                                 size_t *preferral_count)
2470 {
2471         time_t timestamp = 0;
2472         char *stripped = NULL;
2473         struct smb_filename *full_fname = NULL;
2474         struct smb_filename *conv = NULL;
2475         NTSTATUS status;
2476
2477         full_fname = full_path_from_dirfsp_atname(talloc_tos(),
2478                                                   dirfsp,
2479                                                   smb_fname);
2480         if (full_fname == NULL) {
2481                 return NT_STATUS_NO_MEMORY;
2482         }
2483
2484         if (!shadow_copy2_strip_snapshot(mem_ctx,
2485                                         handle,
2486                                         full_fname,
2487                                         &timestamp,
2488                                         &stripped)) {
2489                 TALLOC_FREE(full_fname);
2490                 return NT_STATUS_NO_MEMORY;
2491         }
2492         if (timestamp == 0) {
2493                 TALLOC_FREE(full_fname);
2494                 TALLOC_FREE(stripped);
2495                 return SMB_VFS_NEXT_READ_DFS_PATHAT(handle,
2496                                         mem_ctx,
2497                                         dirfsp,
2498                                         smb_fname,
2499                                         ppreflist,
2500                                         preferral_count);
2501         }
2502
2503         conv = cp_smb_filename(mem_ctx, full_fname);
2504         if (conv == NULL) {
2505                 TALLOC_FREE(full_fname);
2506                 TALLOC_FREE(stripped);
2507                 return NT_STATUS_NO_MEMORY;
2508         }
2509         TALLOC_FREE(full_fname);
2510         conv->base_name = shadow_copy2_convert(conv,
2511                                         handle,
2512                                         stripped,
2513                                         timestamp);
2514         TALLOC_FREE(stripped);
2515         if (conv->base_name == NULL) {
2516                 TALLOC_FREE(conv);
2517                 return NT_STATUS_NO_MEMORY;
2518         }
2519
2520         status = SMB_VFS_NEXT_READ_DFS_PATHAT(handle,
2521                                 mem_ctx,
2522                                 handle->conn->cwd_fsp,
2523                                 conv,
2524                                 ppreflist,
2525                                 preferral_count);
2526
2527         if (NT_STATUS_IS_OK(status)) {
2528                 /* Return any stat(2) info. */
2529                 smb_fname->st = conv->st;
2530         }
2531
2532         TALLOC_FREE(conv);
2533         return status;
2534 }
2535
2536 static NTSTATUS shadow_copy2_get_real_filename_at(
2537         struct vfs_handle_struct *handle,
2538         struct files_struct *dirfsp,
2539         const char *name,
2540         TALLOC_CTX *mem_ctx,
2541         char **found_name)
2542 {
2543         struct shadow_copy2_private *priv = NULL;
2544         time_t timestamp = 0;
2545         char *stripped = NULL;
2546         char *conv;
2547         struct smb_filename *conv_fname = NULL;
2548         NTSTATUS status;
2549         bool ok;
2550
2551         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
2552                                 return NT_STATUS_INTERNAL_ERROR);
2553
2554         DBG_DEBUG("Path=[%s] name=[%s]\n", fsp_str_dbg(dirfsp), name);
2555
2556         ok = shadow_copy2_strip_snapshot(
2557                 talloc_tos(), handle, dirfsp->fsp_name, &timestamp, &stripped);
2558         if (!ok) {
2559                 status = map_nt_error_from_unix(errno);
2560                 DEBUG(10, ("shadow_copy2_strip_snapshot failed\n"));
2561                 return status;
2562         }
2563         if (timestamp == 0) {
2564                 DEBUG(10, ("timestamp == 0\n"));
2565                 return SMB_VFS_NEXT_GET_REAL_FILENAME_AT(
2566                         handle, dirfsp, name, mem_ctx, found_name);
2567         }
2568
2569         /*
2570          * Note that stripped may be an empty string "" if path was ".". As
2571          * shadow_copy2_convert() combines "" with the shadow-copy tree connect
2572          * root fullpath and get_real_filename_full_scan() has an explicit check
2573          * for "" this works.
2574          */
2575         DBG_DEBUG("stripped [%s]\n", stripped);
2576
2577         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2578         if (conv == NULL) {
2579                 status = map_nt_error_from_unix(errno);
2580                 DBG_DEBUG("shadow_copy2_convert [%s] failed: %s\n",
2581                           stripped,
2582                           strerror(errno));
2583                 return status;
2584         }
2585
2586         status = synthetic_pathref(
2587                 talloc_tos(),
2588                 dirfsp->conn->cwd_fsp,
2589                 conv,
2590                 NULL,
2591                 NULL,
2592                 0,
2593                 0,
2594                 &conv_fname);
2595         if (!NT_STATUS_IS_OK(status)) {
2596                 return status;
2597         }
2598
2599         DEBUG(10, ("Calling NEXT_GET_REAL_FILE_NAME for conv=[%s], "
2600                    "name=[%s]\n", conv, name));
2601         status = SMB_VFS_NEXT_GET_REAL_FILENAME_AT(
2602                 handle, conv_fname->fsp, name, mem_ctx, found_name);
2603         DEBUG(10, ("NEXT_REAL_FILE_NAME returned %s\n", nt_errstr(status)));
2604         if (NT_STATUS_IS_OK(status)) {
2605                 TALLOC_FREE(conv_fname);
2606                 return NT_STATUS_OK;
2607         }
2608         if (!NT_STATUS_EQUAL(status, NT_STATUS_NOT_SUPPORTED)) {
2609                 TALLOC_FREE(conv_fname);
2610                 TALLOC_FREE(conv);
2611                 return NT_STATUS_NOT_SUPPORTED;
2612         }
2613
2614         status = get_real_filename_full_scan_at(
2615                 conv_fname->fsp, name, false, mem_ctx, found_name);
2616         TALLOC_FREE(conv_fname);
2617         if (!NT_STATUS_IS_OK(status)) {
2618                 DBG_DEBUG("Scan [%s] for [%s] failed\n",
2619                           conv, name);
2620                 return status;
2621         }
2622
2623         DBG_DEBUG("Scan [%s] for [%s] returned [%s]\n",
2624                   conv, name, *found_name);
2625
2626         TALLOC_FREE(conv);
2627         return NT_STATUS_OK;
2628 }
2629
2630 static const char *shadow_copy2_connectpath(
2631         struct vfs_handle_struct *handle,
2632         const struct files_struct *dirfsp,
2633         const struct smb_filename *smb_fname_in)
2634 {
2635         time_t timestamp = 0;
2636         char *stripped = NULL;
2637         char *tmp = NULL;
2638         const char *fname = smb_fname_in->base_name;
2639         const struct smb_filename *full = NULL;
2640         struct smb_filename smb_fname = {0};
2641         struct smb_filename *result_fname = NULL;
2642         char *result = NULL;
2643         char *parent_dir = NULL;
2644         int saved_errno = 0;
2645         size_t rootpath_len = 0;
2646         struct shadow_copy2_private *priv = NULL;
2647
2648         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
2649                                 return NULL);
2650
2651         DBG_DEBUG("Calc connect path for [%s]\n", fname);
2652
2653         if (priv->shadow_connectpath != NULL) {
2654                 DBG_DEBUG("cached connect path is [%s]\n",
2655                         priv->shadow_connectpath);
2656                 return priv->shadow_connectpath;
2657         }
2658
2659         full = full_path_from_dirfsp_atname(
2660                 talloc_tos(), dirfsp, smb_fname_in);
2661         if (full == NULL) {
2662                 return NULL;
2663         }
2664
2665         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, full,
2666                                          &timestamp, &stripped)) {
2667                 goto done;
2668         }
2669         if (timestamp == 0) {
2670                 return SMB_VFS_NEXT_CONNECTPATH(handle, dirfsp, smb_fname_in);
2671         }
2672
2673         tmp = shadow_copy2_do_convert(talloc_tos(), handle, stripped, timestamp,
2674                                       &rootpath_len);
2675         if (tmp == NULL) {
2676                 if (errno != ENOENT) {
2677                         goto done;
2678                 }
2679
2680                 /*
2681                  * If the converted path does not exist, and converting
2682                  * the parent yields something that does exist, then
2683                  * this path refers to something that has not been
2684                  * created yet, relative to the parent path.
2685                  * The snapshot finding is relative to the parent.
2686                  * (usually snapshots are read/only but this is not
2687                  * necessarily true).
2688                  * This code also covers getting a wildcard in the
2689                  * last component, because this function is called
2690                  * prior to sanitizing the path, and in SMB1 we may
2691                  * get wildcards in path names.
2692                  */
2693                 if (!parent_dirname(talloc_tos(), stripped, &parent_dir,
2694                                     NULL)) {
2695                         errno = ENOMEM;
2696                         goto done;
2697                 }
2698
2699                 tmp = shadow_copy2_do_convert(talloc_tos(), handle, parent_dir,
2700                                               timestamp, &rootpath_len);
2701                 if (tmp == NULL) {
2702                         goto done;
2703                 }
2704         }
2705
2706         DBG_DEBUG("converted path is [%s] root path is [%.*s]\n", tmp,
2707                   (int)rootpath_len, tmp);
2708
2709         tmp[rootpath_len] = '\0';
2710         smb_fname = (struct smb_filename) { .base_name = tmp };
2711
2712         result_fname = SMB_VFS_NEXT_REALPATH(handle, priv, &smb_fname);
2713         if (result_fname == NULL) {
2714                 goto done;
2715         }
2716
2717         /*
2718          * SMB_VFS_NEXT_REALPATH returns a talloc'ed string.
2719          * Don't leak memory.
2720          */
2721         TALLOC_FREE(priv->shadow_realpath);
2722         priv->shadow_realpath = result_fname;
2723         result = priv->shadow_realpath->base_name;
2724
2725         DBG_DEBUG("connect path is [%s]\n", result);
2726
2727 done:
2728         if (result == NULL) {
2729                 saved_errno = errno;
2730         }
2731         TALLOC_FREE(tmp);
2732         TALLOC_FREE(stripped);
2733         TALLOC_FREE(parent_dir);
2734         if (saved_errno != 0) {
2735                 errno = saved_errno;
2736         }
2737         return result;
2738 }
2739
2740 static NTSTATUS shadow_copy2_parent_pathname(vfs_handle_struct *handle,
2741                                              TALLOC_CTX *ctx,
2742                                              const struct smb_filename *smb_fname_in,
2743                                              struct smb_filename **parent_dir_out,
2744                                              struct smb_filename **atname_out)
2745 {
2746         time_t timestamp = 0;
2747         char *stripped = NULL;
2748         char *converted_name = NULL;
2749         struct smb_filename *smb_fname = NULL;
2750         struct smb_filename *parent = NULL;
2751         struct smb_filename *atname = NULL;
2752         struct shadow_copy2_private *priv = NULL;
2753         bool ok = false;
2754         bool is_converted = false;
2755         NTSTATUS status = NT_STATUS_OK;
2756         TALLOC_CTX *frame = NULL;
2757
2758         SMB_VFS_HANDLE_GET_DATA(handle,
2759                                 priv,
2760                                 struct shadow_copy2_private,
2761                                 return NT_STATUS_INTERNAL_ERROR);
2762
2763         frame = talloc_stackframe();
2764
2765         smb_fname = cp_smb_filename(frame, smb_fname_in);
2766         if (smb_fname == NULL) {
2767                 status = NT_STATUS_NO_MEMORY;
2768                 goto fail;
2769         }
2770
2771         /* First, call the default PARENT_PATHNAME. */
2772         status = SMB_VFS_NEXT_PARENT_PATHNAME(handle,
2773                                               frame,
2774                                               smb_fname,
2775                                               &parent,
2776                                               &atname);
2777         if (!NT_STATUS_IS_OK(status)) {
2778                 goto fail;
2779         }
2780
2781         if (parent->twrp == 0) {
2782                 /*
2783                  * Parent is not a snapshot path, return
2784                  * the regular result.
2785                  */
2786                 status = NT_STATUS_OK;
2787                 goto out;
2788         }
2789
2790         /* See if we can find a snapshot for the parent. */
2791         ok = shadow_copy2_strip_snapshot_converted(frame,
2792                                                    handle,
2793                                                    parent,
2794                                                    &timestamp,
2795                                                    &stripped,
2796                                                    &is_converted);
2797         if (!ok) {
2798                 status = map_nt_error_from_unix(errno);
2799                 goto fail;
2800         }
2801
2802         if (is_converted) {
2803                 /*
2804                  * Already found snapshot for parent so wipe
2805                  * out the twrp.
2806                  */
2807                 parent->twrp = 0;
2808                 goto out;
2809         }
2810
2811         converted_name = shadow_copy2_convert(frame,
2812                                               handle,
2813                                               stripped,
2814                                               timestamp);
2815
2816         if (converted_name == NULL) {
2817                 /*
2818                  * Can't find snapshot for parent so wipe
2819                  * out the twrp.
2820                  */
2821                 parent->twrp = 0;
2822         }
2823
2824   out:
2825
2826         *parent_dir_out = talloc_move(ctx, &parent);
2827         if (atname_out != NULL) {
2828                 *atname_out = talloc_move(*parent_dir_out, &atname);
2829         }
2830
2831   fail:
2832
2833         TALLOC_FREE(frame);
2834         return status;
2835 }
2836
2837 static uint64_t shadow_copy2_disk_free(vfs_handle_struct *handle,
2838                                 const struct smb_filename *smb_fname,
2839                                 uint64_t *bsize,
2840                                 uint64_t *dfree,
2841                                 uint64_t *dsize)
2842 {
2843         time_t timestamp = 0;
2844         char *stripped = NULL;
2845         int saved_errno = 0;
2846         char *conv = NULL;
2847         struct smb_filename *conv_smb_fname = NULL;
2848         uint64_t ret = (uint64_t)-1;
2849
2850         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2851                                 handle,
2852                                 smb_fname,
2853                                 &timestamp,
2854                                 &stripped)) {
2855                 return (uint64_t)-1;
2856         }
2857         if (timestamp == 0) {
2858                 return SMB_VFS_NEXT_DISK_FREE(handle, smb_fname,
2859                                               bsize, dfree, dsize);
2860         }
2861         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2862         TALLOC_FREE(stripped);
2863         if (conv == NULL) {
2864                 return (uint64_t)-1;
2865         }
2866         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2867                                         conv,
2868                                         NULL,
2869                                         NULL,
2870                                         0,
2871                                         smb_fname->flags);
2872         if (conv_smb_fname == NULL) {
2873                 TALLOC_FREE(conv);
2874                 return (uint64_t)-1;
2875         }
2876         ret = SMB_VFS_NEXT_DISK_FREE(handle, conv_smb_fname,
2877                                 bsize, dfree, dsize);
2878         if (ret == (uint64_t)-1) {
2879                 saved_errno = errno;
2880         }
2881         TALLOC_FREE(conv);
2882         TALLOC_FREE(conv_smb_fname);
2883         if (saved_errno != 0) {
2884                 errno = saved_errno;
2885         }
2886         return ret;
2887 }
2888
2889 static int shadow_copy2_get_quota(vfs_handle_struct *handle,
2890                                 const struct smb_filename *smb_fname,
2891                                 enum SMB_QUOTA_TYPE qtype,
2892                                 unid_t id,
2893                                 SMB_DISK_QUOTA *dq)
2894 {
2895         time_t timestamp = 0;
2896         char *stripped = NULL;
2897         int ret;
2898         int saved_errno = 0;
2899         char *conv;
2900         struct smb_filename *conv_smb_fname = NULL;
2901
2902         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2903                                 handle,
2904                                 smb_fname,
2905                                 &timestamp,
2906                                 &stripped)) {
2907                 return -1;
2908         }
2909         if (timestamp == 0) {
2910                 return SMB_VFS_NEXT_GET_QUOTA(handle, smb_fname, qtype, id, dq);
2911         }
2912
2913         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2914         TALLOC_FREE(stripped);
2915         if (conv == NULL) {
2916                 return -1;
2917         }
2918         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2919                                         conv,
2920                                         NULL,
2921                                         NULL,
2922                                         0,
2923                                         smb_fname->flags);
2924         if (conv_smb_fname == NULL) {
2925                 TALLOC_FREE(conv);
2926                 return -1;
2927         }
2928         ret = SMB_VFS_NEXT_GET_QUOTA(handle, conv_smb_fname, qtype, id, dq);
2929
2930         if (ret == -1) {
2931                 saved_errno = errno;
2932         }
2933         TALLOC_FREE(conv);
2934         TALLOC_FREE(conv_smb_fname);
2935         if (saved_errno != 0) {
2936                 errno = saved_errno;
2937         }
2938
2939         return ret;
2940 }
2941
2942 static ssize_t shadow_copy2_pwrite(vfs_handle_struct *handle,
2943                                    files_struct *fsp,
2944                                    const void *data,
2945                                    size_t n,
2946                                    off_t offset)
2947 {
2948         ssize_t nwritten;
2949
2950         nwritten = SMB_VFS_NEXT_PWRITE(handle, fsp, data, n, offset);
2951         if (nwritten == -1) {
2952                 if (errno == EBADF && fsp->fsp_flags.can_write) {
2953                         errno = EROFS;
2954                 }
2955         }
2956
2957         return nwritten;
2958 }
2959
2960 struct shadow_copy2_pwrite_state {
2961         vfs_handle_struct *handle;
2962         files_struct *fsp;
2963         ssize_t ret;
2964         struct vfs_aio_state vfs_aio_state;
2965 };
2966
2967 static void shadow_copy2_pwrite_done(struct tevent_req *subreq);
2968
2969 static struct tevent_req *shadow_copy2_pwrite_send(
2970         struct vfs_handle_struct *handle, TALLOC_CTX *mem_ctx,
2971         struct tevent_context *ev, struct files_struct *fsp,
2972         const void *data, size_t n, off_t offset)
2973 {
2974         struct tevent_req *req = NULL, *subreq = NULL;
2975         struct shadow_copy2_pwrite_state *state = NULL;
2976
2977         req = tevent_req_create(mem_ctx, &state,
2978                                 struct shadow_copy2_pwrite_state);
2979         if (req == NULL) {
2980                 return NULL;
2981         }
2982         state->handle = handle;
2983         state->fsp = fsp;
2984
2985         subreq = SMB_VFS_NEXT_PWRITE_SEND(state,
2986                                           ev,
2987                                           handle,
2988                                           fsp,
2989                                           data,
2990                                           n,
2991                                           offset);
2992         if (tevent_req_nomem(subreq, req)) {
2993                 return tevent_req_post(req, ev);
2994         }
2995         tevent_req_set_callback(subreq, shadow_copy2_pwrite_done, req);
2996
2997         return req;
2998 }
2999
3000 static void shadow_copy2_pwrite_done(struct tevent_req *subreq)
3001 {
3002         struct tevent_req *req = tevent_req_callback_data(
3003                 subreq, struct tevent_req);
3004         struct shadow_copy2_pwrite_state *state = tevent_req_data(
3005                 req, struct shadow_copy2_pwrite_state);
3006
3007         state->ret = SMB_VFS_PWRITE_RECV(subreq, &state->vfs_aio_state);
3008         TALLOC_FREE(subreq);
3009         if (state->ret == -1) {
3010                 tevent_req_error(req, state->vfs_aio_state.error);
3011                 return;
3012         }
3013
3014         tevent_req_done(req);
3015 }
3016
3017 static ssize_t shadow_copy2_pwrite_recv(struct tevent_req *req,
3018                                           struct vfs_aio_state *vfs_aio_state)
3019 {
3020         struct shadow_copy2_pwrite_state *state = tevent_req_data(
3021                 req, struct shadow_copy2_pwrite_state);
3022
3023         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
3024                 if ((vfs_aio_state->error == EBADF) &&
3025                     state->fsp->fsp_flags.can_write)
3026                 {
3027                         vfs_aio_state->error = EROFS;
3028                         errno = EROFS;
3029                 }
3030                 return -1;
3031         }
3032
3033         *vfs_aio_state = state->vfs_aio_state;
3034         return state->ret;
3035 }
3036
3037 static int shadow_copy2_connect(struct vfs_handle_struct *handle,
3038                                 const char *service, const char *user)
3039 {
3040         struct shadow_copy2_config *config;
3041         struct shadow_copy2_private *priv;
3042         int ret;
3043         const char *snapdir;
3044         const char *snapprefix = NULL;
3045         const char *delimiter;
3046         const char *gmt_format;
3047         const char *sort_order;
3048         const char *basedir = NULL;
3049         const char *snapsharepath = NULL;
3050         const char *mount_point;
3051
3052         DEBUG(10, (__location__ ": cnum[%u], connectpath[%s]\n",
3053                    (unsigned)handle->conn->cnum,
3054                    handle->conn->connectpath));
3055
3056         ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
3057         if (ret < 0) {
3058                 return ret;
3059         }
3060
3061         priv = talloc_zero(handle->conn, struct shadow_copy2_private);
3062         if (priv == NULL) {
3063                 DBG_ERR("talloc_zero() failed\n");
3064                 errno = ENOMEM;
3065                 return -1;
3066         }
3067
3068         priv->snaps = talloc_zero(priv, struct shadow_copy2_snaplist_info);
3069         if (priv->snaps == NULL) {
3070                 DBG_ERR("talloc_zero() failed\n");
3071                 errno = ENOMEM;
3072                 return -1;
3073         }
3074
3075         config = talloc_zero(priv, struct shadow_copy2_config);
3076         if (config == NULL) {
3077                 DEBUG(0, ("talloc_zero() failed\n"));
3078                 errno = ENOMEM;
3079                 return -1;
3080         }
3081
3082         priv->config = config;
3083
3084         gmt_format = lp_parm_const_string(SNUM(handle->conn),
3085                                           "shadow", "format",
3086                                           GMT_FORMAT);
3087         config->gmt_format = talloc_strdup(config, gmt_format);
3088         if (config->gmt_format == NULL) {
3089                 DEBUG(0, ("talloc_strdup() failed\n"));
3090                 errno = ENOMEM;
3091                 return -1;
3092         }
3093
3094         /* config->gmt_format must not contain a path separator. */
3095         if (strchr(config->gmt_format, '/') != NULL) {
3096                 DEBUG(0, ("shadow:format %s must not contain a /"
3097                         "character. Unable to initialize module.\n",
3098                         config->gmt_format));
3099                 errno = EINVAL;
3100                 return -1;
3101         }
3102
3103         config->use_sscanf = lp_parm_bool(SNUM(handle->conn),
3104                                           "shadow", "sscanf", false);
3105
3106         config->use_localtime = lp_parm_bool(SNUM(handle->conn),
3107                                              "shadow", "localtime",
3108                                              false);
3109
3110         snapdir = lp_parm_const_string(SNUM(handle->conn),
3111                                        "shadow", "snapdir",
3112                                        ".snapshots");
3113         config->snapdir = talloc_strdup(config, snapdir);
3114         if (config->snapdir == NULL) {
3115                 DEBUG(0, ("talloc_strdup() failed\n"));
3116                 errno = ENOMEM;
3117                 return -1;
3118         }
3119
3120         snapprefix = lp_parm_const_string(SNUM(handle->conn),
3121                                        "shadow", "snapprefix",
3122                                        NULL);
3123         if (snapprefix != NULL) {
3124                 priv->snaps->regex = talloc_zero(priv->snaps, regex_t);
3125                 if (priv->snaps->regex == NULL) {
3126                         DBG_ERR("talloc_zero() failed\n");
3127                         errno = ENOMEM;
3128                         return -1;
3129                 }
3130
3131                 /* pre-compute regex rule for matching pattern later */
3132                 ret = regcomp(priv->snaps->regex, snapprefix, 0);
3133                 if (ret) {
3134                         DBG_ERR("Failed to create regex object\n");
3135                         return -1;
3136                 }
3137         }
3138
3139         delimiter = lp_parm_const_string(SNUM(handle->conn),
3140                                        "shadow", "delimiter",
3141                                        "_GMT");
3142         if (delimiter != NULL) {
3143                 priv->config->delimiter = talloc_strdup(priv->config, delimiter);
3144                 if (priv->config->delimiter == NULL) {
3145                         DBG_ERR("talloc_strdup() failed\n");
3146                         errno = ENOMEM;
3147                         return -1;
3148                 }
3149         }
3150
3151         config->snapdirseverywhere = lp_parm_bool(SNUM(handle->conn),
3152                                                   "shadow",
3153                                                   "snapdirseverywhere",
3154                                                   false);
3155
3156         config->crossmountpoints = lp_parm_bool(SNUM(handle->conn),
3157                                                 "shadow", "crossmountpoints",
3158                                                 false);
3159
3160         if (config->crossmountpoints && !config->snapdirseverywhere) {
3161                 DBG_WARNING("Warning: 'crossmountpoints' depends on "
3162                             "'snapdirseverywhere'. Disabling crossmountpoints.\n");
3163         }
3164
3165         config->fixinodes = lp_parm_bool(SNUM(handle->conn),
3166                                          "shadow", "fixinodes",
3167                                          false);
3168
3169         sort_order = lp_parm_const_string(SNUM(handle->conn),
3170                                           "shadow", "sort", "desc");
3171         config->sort_order = talloc_strdup(config, sort_order);
3172         if (config->sort_order == NULL) {
3173                 DEBUG(0, ("talloc_strdup() failed\n"));
3174                 errno = ENOMEM;
3175                 return -1;
3176         }
3177
3178         mount_point = lp_parm_const_string(SNUM(handle->conn),
3179                                            "shadow", "mountpoint", NULL);
3180         if (mount_point != NULL) {
3181                 if (mount_point[0] != '/') {
3182                         DEBUG(1, (__location__ " Warning: 'mountpoint' is "
3183                                   "relative ('%s'), but it has to be an "
3184                                   "absolute path. Ignoring provided value.\n",
3185                                   mount_point));
3186                         mount_point = NULL;
3187                 } else {
3188                         char *p;
3189                         p = strstr(handle->conn->connectpath, mount_point);
3190                         if (p != handle->conn->connectpath) {
3191                                 DBG_WARNING("Warning: the share root (%s) is "
3192                                             "not a subdirectory of the "
3193                                             "specified mountpoint (%s). "
3194                                             "Ignoring provided value.\n",
3195                                             handle->conn->connectpath,
3196                                             mount_point);
3197                                 mount_point = NULL;
3198                         }
3199                 }
3200         }
3201
3202         if (mount_point != NULL) {
3203                 config->mount_point = talloc_strdup(config, mount_point);
3204                 if (config->mount_point == NULL) {
3205                         DEBUG(0, (__location__ " talloc_strdup() failed\n"));
3206                         return -1;
3207                 }
3208         } else {
3209                 config->mount_point = shadow_copy2_find_mount_point(config,
3210                                                                     handle);
3211                 if (config->mount_point == NULL) {
3212                         DBG_WARNING("shadow_copy2_find_mount_point "
3213                                     "of the share root '%s' failed: %s\n",
3214                                     handle->conn->connectpath, strerror(errno));
3215                         return -1;
3216                 }
3217         }
3218
3219         basedir = lp_parm_const_string(SNUM(handle->conn),
3220                                        "shadow", "basedir", NULL);
3221
3222         if (basedir != NULL) {
3223                 if (basedir[0] != '/') {
3224                         DEBUG(1, (__location__ " Warning: 'basedir' is "
3225                                   "relative ('%s'), but it has to be an "
3226                                   "absolute path. Disabling basedir.\n",
3227                                   basedir));
3228                         basedir = NULL;
3229                 } else {
3230                         char *p;
3231                         p = strstr(basedir, config->mount_point);
3232                         if (p != basedir) {
3233                                 DEBUG(1, ("Warning: basedir (%s) is not a "
3234                                           "subdirectory of the share root's "
3235                                           "mount point (%s). "
3236                                           "Disabling basedir\n",
3237                                           basedir, config->mount_point));
3238                                 basedir = NULL;
3239                         }
3240                 }
3241         }
3242
3243         if (config->snapdirseverywhere && basedir != NULL) {
3244                 DEBUG(1, (__location__ " Warning: 'basedir' is incompatible "
3245                           "with 'snapdirseverywhere'. Disabling basedir.\n"));
3246                 basedir = NULL;
3247         }
3248
3249         snapsharepath = lp_parm_const_string(SNUM(handle->conn), "shadow",
3250                                              "snapsharepath", NULL);
3251         if (snapsharepath != NULL) {
3252                 if (snapsharepath[0] == '/') {
3253                         DBG_WARNING("Warning: 'snapsharepath' is "
3254                                     "absolute ('%s'), but it has to be a "
3255                                     "relative path. Disabling snapsharepath.\n",
3256                                     snapsharepath);
3257                         snapsharepath = NULL;
3258                 }
3259                 if (config->snapdirseverywhere && snapsharepath != NULL) {
3260                         DBG_WARNING("Warning: 'snapsharepath' is incompatible "
3261                                     "with 'snapdirseverywhere'. Disabling "
3262                                     "snapsharepath.\n");
3263                         snapsharepath = NULL;
3264                 }
3265         }
3266
3267         if (basedir != NULL && snapsharepath != NULL) {
3268                 DBG_WARNING("Warning: 'snapsharepath' is incompatible with "
3269                             "'basedir'. Disabling snapsharepath\n");
3270                 snapsharepath = NULL;
3271         }
3272
3273         if (snapsharepath != NULL) {
3274                 config->rel_connectpath = talloc_strdup(config, snapsharepath);
3275                 if (config->rel_connectpath == NULL) {
3276                         DBG_ERR("talloc_strdup() failed\n");
3277                         errno = ENOMEM;
3278                         return -1;
3279                 }
3280         }
3281
3282         if (basedir == NULL) {
3283                 basedir = config->mount_point;
3284         }
3285
3286         if (config->rel_connectpath == NULL &&
3287             strlen(basedir) < strlen(handle->conn->connectpath)) {
3288                 config->rel_connectpath = talloc_strdup(config,
3289                         handle->conn->connectpath + strlen(basedir));
3290                 if (config->rel_connectpath == NULL) {
3291                         DEBUG(0, ("talloc_strdup() failed\n"));
3292                         errno = ENOMEM;
3293                         return -1;
3294                 }
3295         }
3296
3297         if (config->snapdir[0] == '/') {
3298                 config->snapdir_absolute = true;
3299
3300                 if (config->snapdirseverywhere == true) {
3301                         DEBUG(1, (__location__ " Warning: An absolute snapdir "
3302                                   "is incompatible with 'snapdirseverywhere', "
3303                                   "setting 'snapdirseverywhere' to false.\n"));
3304                         config->snapdirseverywhere = false;
3305                 }
3306
3307                 if (config->crossmountpoints == true) {
3308                         DEBUG(1, (__location__ " Warning: 'crossmountpoints' "
3309                                   "is not supported with an absolute snapdir. "
3310                                   "Disabling it.\n"));
3311                         config->crossmountpoints = false;
3312                 }
3313
3314                 config->snapshot_basepath = config->snapdir;
3315         } else {
3316                 config->snapshot_basepath = talloc_asprintf(config, "%s/%s",
3317                                 config->mount_point, config->snapdir);
3318                 if (config->snapshot_basepath == NULL) {
3319                         DEBUG(0, ("talloc_asprintf() failed\n"));
3320                         errno = ENOMEM;
3321                         return -1;
3322                 }
3323         }
3324
3325         trim_string(config->mount_point, NULL, "/");
3326         trim_string(config->rel_connectpath, "/", "/");
3327         trim_string(config->snapdir, NULL, "/");
3328         trim_string(config->snapshot_basepath, NULL, "/");
3329
3330         DEBUG(10, ("shadow_copy2_connect: configuration:\n"
3331                    "  share root: '%s'\n"
3332                    "  mountpoint: '%s'\n"
3333                    "  rel share root: '%s'\n"
3334                    "  snapdir: '%s'\n"
3335                    "  snapprefix: '%s'\n"
3336                    "  delimiter: '%s'\n"
3337                    "  snapshot base path: '%s'\n"
3338                    "  format: '%s'\n"
3339                    "  use sscanf: %s\n"
3340                    "  snapdirs everywhere: %s\n"
3341                    "  cross mountpoints: %s\n"
3342                    "  fix inodes: %s\n"
3343                    "  sort order: %s\n"
3344                    "",
3345                    handle->conn->connectpath,
3346                    config->mount_point,
3347                    config->rel_connectpath,
3348                    config->snapdir,
3349                    snapprefix,
3350                    config->delimiter,
3351                    config->snapshot_basepath,
3352                    config->gmt_format,
3353                    config->use_sscanf ? "yes" : "no",
3354                    config->snapdirseverywhere ? "yes" : "no",
3355                    config->crossmountpoints ? "yes" : "no",
3356                    config->fixinodes ? "yes" : "no",
3357                    config->sort_order
3358                    ));
3359
3360
3361         SMB_VFS_HANDLE_SET_DATA(handle, priv,
3362                                 NULL, struct shadow_copy2_private,
3363                                 return -1);
3364
3365         return 0;
3366 }
3367
3368 static struct dirent *shadow_copy2_readdir(vfs_handle_struct *handle,
3369                                            struct files_struct *dirfsp,
3370                                            DIR *dirp,
3371                                            SMB_STRUCT_STAT *sbuf)
3372 {
3373         struct shadow_copy2_private *priv = NULL;
3374         struct dirent *ent = NULL;
3375         struct smb_filename atname;
3376         struct smb_filename *full_fname = NULL;
3377         time_t timestamp = 0;
3378         char *stripped = NULL;
3379         char *conv = NULL;
3380         char *abspath = NULL;
3381         bool converted = false;
3382
3383         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
3384                                 return NULL);
3385
3386         ent = SMB_VFS_NEXT_READDIR(handle, dirfsp, dirp, sbuf);
3387         if (ent == NULL) {
3388                 return NULL;
3389         }
3390         if (sbuf == NULL) {
3391                 return ent;
3392         }
3393         if (ISDOT(dirfsp->fsp_name->base_name) && ISDOTDOT(ent->d_name)) {
3394                 return ent;
3395         }
3396
3397         atname = (struct smb_filename) {
3398                 .base_name = ent->d_name,
3399                 .twrp = dirfsp->fsp_name->twrp,
3400                 .flags = dirfsp->fsp_name->flags,
3401         };
3402
3403         full_fname = full_path_from_dirfsp_atname(talloc_tos(),
3404                                                   dirfsp,
3405                                                   &atname);
3406         if (full_fname == NULL) {
3407                 return NULL;
3408         }
3409
3410         if (!shadow_copy2_strip_snapshot_converted(talloc_tos(),
3411                                                    handle,
3412                                                    full_fname,
3413                                                    &timestamp,
3414                                                    &stripped,
3415                                                    &converted)) {
3416                 TALLOC_FREE(full_fname);
3417                 return NULL;
3418         }
3419
3420         if (timestamp == 0 && !converted) {
3421                 /* Not a snapshot path, no need for convert_sbuf() */
3422                 TALLOC_FREE(stripped);
3423                 TALLOC_FREE(full_fname);
3424                 return ent;
3425         }
3426
3427         if (timestamp == 0) {
3428                 abspath = make_path_absolute(talloc_tos(),
3429                                              priv,
3430                                              full_fname->base_name);
3431                 TALLOC_FREE(full_fname);
3432                 if (abspath == NULL) {
3433                         return NULL;
3434                 }
3435         } else {
3436                 conv = shadow_copy2_convert(talloc_tos(),
3437                                             handle,
3438                                             stripped,
3439                                             timestamp);
3440                 TALLOC_FREE(stripped);
3441                 if (conv == NULL) {
3442                         return NULL;
3443                 }
3444
3445                 abspath = make_path_absolute(talloc_tos(), priv, conv);
3446                 TALLOC_FREE(conv);
3447                 if (abspath == NULL) {
3448                         return NULL;
3449                 }
3450         }
3451
3452         convert_sbuf(handle, abspath, sbuf);
3453
3454         TALLOC_FREE(abspath);
3455         return ent;
3456 }
3457
3458 static struct vfs_fn_pointers vfs_shadow_copy2_fns = {
3459         .connect_fn = shadow_copy2_connect,
3460         .disk_free_fn = shadow_copy2_disk_free,
3461         .get_quota_fn = shadow_copy2_get_quota,
3462         .create_dfs_pathat_fn = shadow_copy2_create_dfs_pathat,
3463         .read_dfs_pathat_fn = shadow_copy2_read_dfs_pathat,
3464         .renameat_fn = shadow_copy2_renameat,
3465         .linkat_fn = shadow_copy2_linkat,
3466         .symlinkat_fn = shadow_copy2_symlinkat,
3467         .stat_fn = shadow_copy2_stat,
3468         .lstat_fn = shadow_copy2_lstat,
3469         .fstat_fn = shadow_copy2_fstat,
3470         .fstatat_fn = shadow_copy2_fstatat,
3471         .openat_fn = shadow_copy2_openat,
3472         .unlinkat_fn = shadow_copy2_unlinkat,
3473         .fchmod_fn = shadow_copy2_fchmod,
3474         .chdir_fn = shadow_copy2_chdir,
3475         .fntimes_fn = shadow_copy2_fntimes,
3476         .readlinkat_fn = shadow_copy2_readlinkat,
3477         .mknodat_fn = shadow_copy2_mknodat,
3478         .realpath_fn = shadow_copy2_realpath,
3479         .get_shadow_copy_data_fn = shadow_copy2_get_shadow_copy_data,
3480         .mkdirat_fn = shadow_copy2_mkdirat,
3481         .fsetxattr_fn = shadow_copy2_fsetxattr,
3482         .fchflags_fn = shadow_copy2_fchflags,
3483         .get_real_filename_at_fn = shadow_copy2_get_real_filename_at,
3484         .pwrite_fn = shadow_copy2_pwrite,
3485         .pwrite_send_fn = shadow_copy2_pwrite_send,
3486         .pwrite_recv_fn = shadow_copy2_pwrite_recv,
3487         .connectpath_fn = shadow_copy2_connectpath,
3488         .parent_pathname_fn = shadow_copy2_parent_pathname,
3489         .readdir_fn = shadow_copy2_readdir,
3490 };
3491
3492 static_decl_vfs;
3493 NTSTATUS vfs_shadow_copy2_init(TALLOC_CTX *ctx)
3494 {
3495         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION,
3496                                 "shadow_copy2", &vfs_shadow_copy2_fns);
3497 }