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
  40 struct shadow_copy2_config {
  41         char *gmt_format;
  42         bool use_sscanf;
  43         bool use_localtime;
  44         char *snapdir;
  45         char *delimiter;
  46         bool snapdirseverywhere;
  47         bool crossmountpoints;
  48         bool fixinodes;
  49         char *sort_order;
  50         bool snapdir_absolute;
  51         char *mount_point;
  52         char *rel_connectpath; /* share root, relative to a snapshot root */
  53         char *snapshot_basepath; /* the absolute version of snapdir */
  54 };
  55
  56 /* Data-structure to hold the list of snap entries */
  57 struct shadow_copy2_snapentry {
  58         char *snapname;
  59         char *time_fmt;
  60         struct shadow_copy2_snapentry *next;
  61         struct shadow_copy2_snapentry *prev;
  62 };
  63
  64 struct shadow_copy2_snaplist_info {
  65         struct shadow_copy2_snapentry *snaplist; /* snapshot list */
  66         regex_t *regex; /* Regex to filter snaps */
  67         time_t fetch_time; /* snaplist update time */
  68 };
  69
  70
  71 /*
  72  * shadow_copy2 private structure. This structure will be
  73  * used to keep module specific information
  74  */
  75 struct shadow_copy2_private {
  76         struct shadow_copy2_config *config;
  77         struct shadow_copy2_snaplist_info *snaps;
  78         char *shadow_cwd; /* Absolute $cwd path. */
  79         /* Absolute connectpath - can vary depending on $cwd. */
  80         char *shadow_connectpath;
  81         /* malloc'ed realpath return. */
  82         char *shadow_realpath;
  83 };
  84
  85 static int shadow_copy2_get_shadow_copy_data(
  86         vfs_handle_struct *handle, files_struct *fsp,
  87         struct shadow_copy_data *shadow_copy2_data,
  88         bool labels);
  89
  90 /**
  91  *This function will create a new snapshot list entry and
  92  * return to the caller. This entry will also be added to
  93  * the global snapshot list.
  94  *
  95  * @param[in]   priv    shadow_copy2 specific data structure
  96  * @return      Newly   created snapshot entry or NULL on failure
  97  */
  98 static struct shadow_copy2_snapentry *shadow_copy2_create_snapentry(
  99                                         struct shadow_copy2_private *priv)
 100 {
 101         struct shadow_copy2_snapentry *tmpentry = NULL;
 102
 103         tmpentry = talloc_zero(priv->snaps, struct shadow_copy2_snapentry);
 104         if (tmpentry == NULL) {
 105                 DBG_ERR("talloc_zero() failed\n");
 106                 errno = ENOMEM;
 107                 return NULL;
 108         }
 109
 110         DLIST_ADD(priv->snaps->snaplist, tmpentry);
 111
 112         return tmpentry;
 113 }
 114
 115 /**
 116  *This function will delete the entire snaplist and reset
 117  * priv->snaps->snaplist to NULL.
 118  *
 119  * @param[in] priv shadow_copye specific data structure
 120  */
 121 static void shadow_copy2_delete_snaplist(struct shadow_copy2_private *priv)
 122 {
 123         struct shadow_copy2_snapentry *tmp = NULL;
 124
 125         while ((tmp = priv->snaps->snaplist) != NULL) {
 126                 DLIST_REMOVE(priv->snaps->snaplist, tmp);
 127                 talloc_free(tmp);
 128         }
 129 }
 130
 131 /**
 132  * Given a timestamp this function searches the global snapshot list
 133  * and returns the complete snapshot directory name saved in the entry.
 134  *
 135  * @param[in]   priv            shadow_copy2 specific structure
 136  * @param[in]   timestamp       timestamp corresponding to one of the snapshot
 137  * @param[out]  snap_str        buffer to copy the actual snapshot name
 138  * @param[in]   len             length of snap_str buffer
 139  *
 140  * @return      Length of actual snapshot name, and -1 on failure
 141  */
 142 static ssize_t shadow_copy2_saved_snapname(struct shadow_copy2_private *priv,
 143                                           struct tm *timestamp,
 144                                           char *snap_str, size_t len)
 145 {
 146         ssize_t snaptime_len = -1;
 147         struct shadow_copy2_snapentry *entry = NULL;
 148
 149         snaptime_len = strftime(snap_str, len, GMT_FORMAT, timestamp);
 150         if (snaptime_len == 0) {
 151                 DBG_ERR("strftime failed\n");
 152                 return -1;
 153         }
 154
 155         snaptime_len = -1;
 156
 157         for (entry = priv->snaps->snaplist; entry; entry = entry->next) {
 158                 if (strcmp(entry->time_fmt, snap_str) == 0) {
 159                         snaptime_len = snprintf(snap_str, len, "%s",
 160                                                 entry->snapname);
 161                         return snaptime_len;
 162                 }
 163         }
 164
 165         snap_str[0] = 0;
 166         return snaptime_len;
 167 }
 168
 169
 170 /**
 171  * This function will check if snaplist is updated or not. If snaplist
 172  * is empty then it will create a new list. Each time snaplist is updated
 173  * the time is recorded. If the snapshot time is greater than the snaplist
 174  * update time then chances are we are working on an older list. Then discard
 175  * the old list and fetch a new snaplist.
 176  *
 177  * @param[in]   handle          VFS handle struct
 178  * @param[in]   snap_time       time of snapshot
 179  *
 180  * @return      true if the list is updated else false
 181  */
 182 static bool shadow_copy2_update_snaplist(struct vfs_handle_struct *handle,
 183                 time_t snap_time)
 184 {
 185         int ret = -1;
 186         bool snaplist_updated = false;
 187         struct files_struct fsp = {0};
 188         struct smb_filename smb_fname = {0};
 189         double seconds = 0.0;
 190         struct shadow_copy2_private *priv = NULL;
 191
 192         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
 193                                 return false);
 194
 195         seconds = difftime(snap_time, priv->snaps->fetch_time);
 196
 197         /*
 198          * Fetch the snapshot list if either the snaplist is empty or the
 199          * required snapshot time is greater than the last fetched snaplist
 200          * time.
 201          */
 202         if (seconds > 0 || (priv->snaps->snaplist == NULL)) {
 203                 smb_fname.base_name = discard_const_p(char, ".");
 204                 fsp.fsp_name = &smb_fname;
 205
 206                 ret = shadow_copy2_get_shadow_copy_data(handle, &fsp,
 207                                                         NULL, false);
 208                 if (ret == 0) {
 209                         snaplist_updated = true;
 210                 } else {
 211                         DBG_ERR("Failed to get shadow copy data\n");
 212                 }
 213
 214         }
 215
 216         return snaplist_updated;
 217 }
 218
 219 static bool shadow_copy2_find_slashes(TALLOC_CTX *mem_ctx, const char *str,
 220                                       size_t **poffsets,
 221                                       unsigned *pnum_offsets)
 222 {
 223         unsigned num_offsets;
 224         size_t *offsets;
 225         const char *p;
 226
 227         num_offsets = 0;
 228
 229         p = str;
 230         while ((p = strchr(p, '/')) != NULL) {
 231                 num_offsets += 1;
 232                 p += 1;
 233         }
 234
 235         offsets = talloc_array(mem_ctx, size_t, num_offsets);
 236         if (offsets == NULL) {
 237                 return false;
 238         }
 239
 240         p = str;
 241         num_offsets = 0;
 242         while ((p = strchr(p, '/')) != NULL) {
 243                 offsets[num_offsets] = p-str;
 244                 num_offsets += 1;
 245                 p += 1;
 246         }
 247
 248         *poffsets = offsets;
 249         *pnum_offsets = num_offsets;
 250         return true;
 251 }
 252
 253 /**
 254  * Given a timestamp, build the posix level GMT-tag string
 255  * based on the configurable format.
 256  */
 257 static ssize_t shadow_copy2_posix_gmt_string(struct vfs_handle_struct *handle,
 258                                             time_t snapshot,
 259                                             char *snaptime_string,
 260                                             size_t len)
 261 {
 262         struct tm snap_tm;
 263         ssize_t snaptime_len;
 264         struct shadow_copy2_config *config;
 265         struct shadow_copy2_private *priv;
 266
 267         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
 268                                 return 0);
 269
 270         config = priv->config;
 271
 272         if (config->use_sscanf) {
 273                 snaptime_len = snprintf(snaptime_string,
 274                                         len,
 275                                         config->gmt_format,
 276                                         (unsigned long)snapshot);
 277                 if (snaptime_len <= 0) {
 278                         DEBUG(10, ("snprintf failed\n"));
 279                         return -1;
 280                 }
 281         } else {
 282                 if (config->use_localtime) {
 283                         if (localtime_r(&snapshot, &snap_tm) == 0) {
 284                                 DEBUG(10, ("gmtime_r failed\n"));
 285                                 return -1;
 286                         }
 287                 } else {
 288                         if (gmtime_r(&snapshot, &snap_tm) == 0) {
 289                                 DEBUG(10, ("gmtime_r failed\n"));
 290                                 return -1;
 291                         }
 292                 }
 293
 294                 if (priv->snaps->regex != NULL) {
 295                         snaptime_len = shadow_copy2_saved_snapname(priv,
 296                                                 &snap_tm, snaptime_string, len);
 297                         if (snaptime_len >= 0)
 298                                 return snaptime_len;
 299
 300                         /*
 301                          * If we fail to find the snapshot name, chances are
 302                          * that we have not updated our snaplist. Make sure the
 303                          * snaplist is updated.
 304                          */
 305                         if (!shadow_copy2_update_snaplist(handle, snapshot)) {
 306                                 DBG_DEBUG("shadow_copy2_update_snaplist "
 307                                           "failed\n");
 308                                 return -1;
 309                         }
 310
 311                         return shadow_copy2_saved_snapname(priv,
 312                                                 &snap_tm, snaptime_string, len);
 313                 }
 314
 315                 snaptime_len = strftime(snaptime_string,
 316                                         len,
 317                                         config->gmt_format,
 318                                         &snap_tm);
 319                 if (snaptime_len == 0) {
 320                         DEBUG(10, ("strftime failed\n"));
 321                         return -1;
 322                 }
 323         }
 324
 325         return snaptime_len;
 326 }
 327
 328 /**
 329  * Given a timestamp, build the string to insert into a path
 330  * as a path component for creating the local path to the
 331  * snapshot at the given timestamp of the input path.
 332  *
 333  * In the case of a parallel snapdir (specified with an
 334  * absolute path), this is the inital portion of the
 335  * local path of any snapshot file. The complete path is
 336  * obtained by appending the portion of the file's path
 337  * below the share root's mountpoint.
 338  */
 339 static char *shadow_copy2_insert_string(TALLOC_CTX *mem_ctx,
 340                                         struct vfs_handle_struct *handle,
 341                                         time_t snapshot)
 342 {
 343         fstring snaptime_string;
 344         ssize_t snaptime_len = 0;
 345         char *result = NULL;
 346         struct shadow_copy2_config *config;
 347         struct shadow_copy2_private *priv;
 348
 349         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
 350                                 return NULL);
 351
 352         config = priv->config;
 353
 354         snaptime_len = shadow_copy2_posix_gmt_string(handle,
 355                                                      snapshot,
 356                                                      snaptime_string,
 357                                                      sizeof(snaptime_string));
 358         if (snaptime_len <= 0) {
 359                 return NULL;
 360         }
 361
 362         if (config->snapdir_absolute) {
 363                 result = talloc_asprintf(mem_ctx, "%s/%s",
 364                                          config->snapdir, snaptime_string);
 365         } else {
 366                 result = talloc_asprintf(mem_ctx, "/%s/%s",
 367                                          config->snapdir, snaptime_string);
 368         }
 369         if (result == NULL) {
 370                 DEBUG(1, (__location__ " talloc_asprintf failed\n"));
 371         }
 372
 373         return result;
 374 }
 375
 376 /**
 377  * Build the posix snapshot path for the connection
 378  * at the given timestamp, i.e. the absolute posix path
 379  * that contains the snapshot for this file system.
 380  *
 381  * This only applies to classical case, i.e. not
 382  * to the "snapdirseverywhere" mode.
 383  */
 384 static char *shadow_copy2_snapshot_path(TALLOC_CTX *mem_ctx,
 385                                         struct vfs_handle_struct *handle,
 386                                         time_t snapshot)
 387 {
 388         fstring snaptime_string;
 389         ssize_t snaptime_len = 0;
 390         char *result = NULL;
 391         struct shadow_copy2_private *priv;
 392
 393         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
 394                                 return NULL);
 395
 396         snaptime_len = shadow_copy2_posix_gmt_string(handle,
 397                                                      snapshot,
 398                                                      snaptime_string,
 399                                                      sizeof(snaptime_string));
 400         if (snaptime_len <= 0) {
 401                 return NULL;
 402         }
 403
 404         result = talloc_asprintf(mem_ctx, "%s/%s",
 405                                  priv->config->snapshot_basepath, snaptime_string);
 406         if (result == NULL) {
 407                 DEBUG(1, (__location__ " talloc_asprintf failed\n"));
 408         }
 409
 410         return result;
 411 }
 412
 413 static char *make_path_absolute(TALLOC_CTX *mem_ctx,
 414                                 struct shadow_copy2_private *priv,
 415                                 const char *name)
 416 {
 417         char *newpath = NULL;
 418         char *abs_path = NULL;
 419
 420         if (name[0] != '/') {
 421                 newpath = talloc_asprintf(mem_ctx,
 422                                         "%s/%s",
 423                                         priv->shadow_cwd,
 424                                         name);
 425                 if (newpath == NULL) {
 426                         return NULL;
 427                 }
 428                 name = newpath;
 429         }
 430         abs_path = canonicalize_absolute_path(mem_ctx, name);
 431         TALLOC_FREE(newpath);
 432         return abs_path;
 433 }
 434
 435 /* Return a $cwd-relative path. */
 436 static bool make_relative_path(const char *cwd, char *abs_path)
 437 {
 438         size_t cwd_len = strlen(cwd);
 439         size_t abs_len = strlen(abs_path);
 440
 441         if (abs_len < cwd_len) {
 442                 return false;
 443         }
 444         if (memcmp(abs_path, cwd, cwd_len) != 0) {
 445                 return false;
 446         }
 447         /* The cwd_len != 1 case is for $cwd == '/' */
 448         if (cwd_len != 1 &&
 449             abs_path[cwd_len] != '/' &&
 450             abs_path[cwd_len] != '\0')
 451         {
 452                 return false;
 453         }
 454         if (abs_path[cwd_len] == '/') {
 455                 cwd_len++;
 456         }
 457         memmove(abs_path, &abs_path[cwd_len], abs_len + 1 - cwd_len);
 458         return true;
 459 }
 460
 461 static bool shadow_copy2_snapshot_to_gmt(vfs_handle_struct *handle,
 462                                         const char *name,
 463                                         char *gmt, size_t gmt_len);
 464
 465 /*
 466  * Check if an incoming filename is already a snapshot converted pathname.
 467  *
 468  * If so, it returns the pathname truncated at the snapshot point which
 469  * will be used as the connectpath.
 470  */
 471
 472 static int check_for_converted_path(TALLOC_CTX *mem_ctx,
 473                                 struct vfs_handle_struct *handle,
 474                                 struct shadow_copy2_private *priv,
 475                                 char *abs_path,
 476                                 bool *ppath_already_converted,
 477                                 char **pconnectpath)
 478 {
 479         size_t snapdirlen = 0;
 480         char *p = strstr_m(abs_path, priv->config->snapdir);
 481         char *q = NULL;
 482         char *connect_path = NULL;
 483         char snapshot[GMT_NAME_LEN+1];
 484
 485         *ppath_already_converted = false;
 486
 487         if (p == NULL) {
 488                 /* Must at least contain shadow:snapdir. */
 489                 return 0;
 490         }
 491
 492         if (priv->config->snapdir[0] == '/' &&
 493                         p != abs_path) {
 494                 /* Absolute shadow:snapdir must be at the start. */
 495                 return 0;
 496         }
 497
 498         snapdirlen = strlen(priv->config->snapdir);
 499         if (p[snapdirlen] != '/') {
 500                 /* shadow:snapdir must end as a separate component. */
 501                 return 0;
 502         }
 503
 504         if (p > abs_path && p[-1] != '/') {
 505                 /* shadow:snapdir must start as a separate component. */
 506                 return 0;
 507         }
 508
 509         p += snapdirlen;
 510         p++; /* Move past the / */
 511
 512         /*
 513          * Need to return up to the next path
 514          * component after the time.
 515          * This will be used as the connectpath.
 516          */
 517         q = strchr(p, '/');
 518         if (q == NULL) {
 519                 /*
 520                  * No next path component.
 521                  * Use entire string.
 522                  */
 523                 connect_path = talloc_strdup(mem_ctx,
 524                                         abs_path);
 525         } else {
 526                 connect_path = talloc_strndup(mem_ctx,
 527                                         abs_path,
 528                                         q - abs_path);
 529         }
 530         if (connect_path == NULL) {
 531                 return ENOMEM;
 532         }
 533
 534         /*
 535          * Point p at the same offset in connect_path as
 536          * it is in abs_path.
 537          */
 538
 539         p = &connect_path[p - abs_path];
 540
 541         /*
 542          * Now ensure there is a time string at p.
 543          * The SMB-format @GMT-token string is returned
 544          * in snapshot.
 545          */
 546
 547         if (!shadow_copy2_snapshot_to_gmt(handle,
 548                                 p,
 549                                 snapshot,
 550                                 sizeof(snapshot))) {
 551                 TALLOC_FREE(connect_path);
 552                 return 0;
 553         }
 554
 555         if (pconnectpath != NULL) {
 556                 *pconnectpath = connect_path;
 557         }
 558
 559         *ppath_already_converted = true;
 560
 561         DBG_DEBUG("path |%s| is already converted. "
 562                 "connect path = |%s|\n",
 563                 abs_path,
 564                 connect_path);
 565
 566         return 0;
 567 }
 568
 569 /**
 570  * This function does two things.
 571  *
 572  * 1). Checks if an incoming filename is already a
 573  * snapshot converted pathname.
 574  *     If so, it returns the pathname truncated
 575  *     at the snapshot point which will be used
 576  *     as the connectpath, and then does an early return.
 577  *
 578  * 2). Checks if an incoming filename contains an
 579  * SMB-layer @GMT- style timestamp.
 580  *     If so, it strips the timestamp, and returns
 581  *     both the timestamp and the stripped path
 582  *     (making it cwd-relative).
 583  */
 584
 585 static bool shadow_copy2_strip_snapshot_internal(TALLOC_CTX *mem_ctx,
 586                                         struct vfs_handle_struct *handle,
 587                                         const char *orig_name,
 588                                         time_t *ptimestamp,
 589                                         char **pstripped,
 590                                         char **psnappath)
 591 {
 592         struct tm tm;
 593         time_t timestamp = 0;
 594         const char *p;
 595         char *q;
 596         char *stripped = NULL;
 597         size_t rest_len, dst_len;
 598         struct shadow_copy2_private *priv;
 599         ptrdiff_t len_before_gmt;
 600         const char *name = orig_name;
 601         char *abs_path = NULL;
 602         bool ret = true;
 603         bool already_converted = false;
 604         int err = 0;
 605
 606         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
 607                                 return false);
 608
 609         DEBUG(10, (__location__ ": enter path '%s'\n", name));
 610
 611         abs_path = make_path_absolute(mem_ctx, priv, name);
 612         if (abs_path == NULL) {
 613                 ret = false;
 614                 goto out;
 615         }
 616         name = abs_path;
 617
 618         DEBUG(10, (__location__ ": abs path '%s'\n", name));
 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                 goto out;
 634         }
 635
 636         /*
 637          * From here we're only looking to strip an
 638          * SMB-layer @GMT- token.
 639          */
 640
 641         p = strstr_m(name, "@GMT-");
 642         if (p == NULL) {
 643                 DEBUG(11, ("@GMT not found\n"));
 644                 goto out;
 645         }
 646         if ((p > name) && (p[-1] != '/')) {
 647                 /* the GMT-token does not start a path-component */
 648                 DEBUG(10, ("not at start, p=%p, name=%p, p[-1]=%d\n",
 649                            p, name, (int)p[-1]));
 650                 goto out;
 651         }
 652
 653         len_before_gmt = p - name;
 654
 655         q = strptime(p, GMT_FORMAT, &tm);
 656         if (q == NULL) {
 657                 DEBUG(10, ("strptime failed\n"));
 658                 goto out;
 659         }
 660         tm.tm_isdst = -1;
 661         timestamp = timegm(&tm);
 662         if (timestamp == (time_t)-1) {
 663                 DEBUG(10, ("timestamp==-1\n"));
 664                 goto out;
 665         }
 666         if (q[0] == '\0') {
 667                 /*
 668                  * The name consists of only the GMT token or the GMT
 669                  * token is at the end of the path. XP seems to send
 670                  * @GMT- at the end under certain circumstances even
 671                  * with a path prefix.
 672                  */
 673                 if (pstripped != NULL) {
 674                         if (len_before_gmt > 1) {
 675                                 /*
 676                                  * There is a path (and not only a slash)
 677                                  * before the @GMT-. Remove the trailing
 678                                  * slash character.
 679                                  */
 680                                 len_before_gmt -= 1;
 681                         }
 682                         stripped = talloc_strndup(mem_ctx, name,
 683                                         len_before_gmt);
 684                         if (stripped == NULL) {
 685                                 ret = false;
 686                                 goto out;
 687                         }
 688                         if (orig_name[0] != '/') {
 689                                 if (make_relative_path(priv->shadow_cwd,
 690                                                 stripped) == false) {
 691                                         DEBUG(10, (__location__ ": path '%s' "
 692                                                 "doesn't start with cwd '%s'\n",
 693                                                 stripped, priv->shadow_cwd));
 694                                                 ret = false;
 695                                         errno = ENOENT;
 696                                         goto out;
 697                                 }
 698                         }
 699                         *pstripped = stripped;
 700                 }
 701                 *ptimestamp = timestamp;
 702                 goto out;
 703         }
 704         if (q[0] != '/') {
 705                 /*
 706                  * It is not a complete path component, i.e. the path
 707                  * component continues after the gmt-token.
 708                  */
 709                 DEBUG(10, ("q[0] = %d\n", (int)q[0]));
 710                 goto out;
 711         }
 712         q += 1;
 713
 714         rest_len = strlen(q);
 715         dst_len = len_before_gmt + rest_len;
 716
 717         if (pstripped != NULL) {
 718                 stripped = talloc_array(mem_ctx, char, dst_len+1);
 719                 if (stripped == NULL) {
 720                         ret = false;
 721                         goto out;
 722                 }
 723                 if (p > name) {
 724                         memcpy(stripped, name, len_before_gmt);
 725                 }
 726                 if (rest_len > 0) {
 727                         memcpy(stripped + len_before_gmt, q, rest_len);
 728                 }
 729                 stripped[dst_len] = '\0';
 730                 if (orig_name[0] != '/') {
 731                         if (make_relative_path(priv->shadow_cwd,
 732                                         stripped) == false) {
 733                                 DEBUG(10, (__location__ ": path '%s' "
 734                                         "doesn't start with cwd '%s'\n",
 735                                         stripped, priv->shadow_cwd));
 736                                 ret = false;
 737                                 errno = ENOENT;
 738                                 goto out;
 739                         }
 740                 }
 741                 *pstripped = stripped;
 742         }
 743         *ptimestamp = timestamp;
 744         ret = true;
 745
 746   out:
 747         TALLOC_FREE(abs_path);
 748         return ret;
 749 }
 750
 751 static bool shadow_copy2_strip_snapshot(TALLOC_CTX *mem_ctx,
 752                                         struct vfs_handle_struct *handle,
 753                                         const char *orig_name,
 754                                         time_t *ptimestamp,
 755                                         char **pstripped)
 756 {
 757         return shadow_copy2_strip_snapshot_internal(mem_ctx,
 758                                         handle,
 759                                         orig_name,
 760                                         ptimestamp,
 761                                         pstripped,
 762                                         NULL);
 763 }
 764
 765 static char *shadow_copy2_find_mount_point(TALLOC_CTX *mem_ctx,
 766                                            vfs_handle_struct *handle)
 767 {
 768         char *path = talloc_strdup(mem_ctx, handle->conn->connectpath);
 769         dev_t dev;
 770         struct stat st;
 771         char *p;
 772
 773         if (stat(path, &st) != 0) {
 774                 talloc_free(path);
 775                 return NULL;
 776         }
 777
 778         dev = st.st_dev;
 779
 780         while ((p = strrchr(path, '/')) && p > path) {
 781                 *p = 0;
 782                 if (stat(path, &st) != 0) {
 783                         talloc_free(path);
 784                         return NULL;
 785                 }
 786                 if (st.st_dev != dev) {
 787                         *p = '/';
 788                         break;
 789                 }
 790         }
 791
 792         return path;
 793 }
 794
 795 /**
 796  * Convert from a name as handed in via the SMB layer
 797  * and a timestamp into the local path of the snapshot
 798  * of the provided file at the provided time.
 799  * Also return the path in the snapshot corresponding
 800  * to the file's share root.
 801  */
 802 static char *shadow_copy2_do_convert(TALLOC_CTX *mem_ctx,
 803                                      struct vfs_handle_struct *handle,
 804                                      const char *name, time_t timestamp,
 805                                      size_t *snaproot_len)
 806 {
 807         struct smb_filename converted_fname;
 808         char *result = NULL;
 809         size_t *slashes = NULL;
 810         unsigned num_slashes;
 811         char *path = NULL;
 812         size_t pathlen;
 813         char *insert = NULL;
 814         char *converted = NULL;
 815         size_t insertlen, connectlen = 0;
 816         int saved_errno = 0;
 817         int i;
 818         size_t min_offset;
 819         struct shadow_copy2_config *config;
 820         struct shadow_copy2_private *priv;
 821         size_t in_share_offset = 0;
 822
 823         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
 824                                 return NULL);
 825
 826         config = priv->config;
 827
 828         DEBUG(10, ("converting '%s'\n", name));
 829
 830         if (!config->snapdirseverywhere) {
 831                 int ret;
 832                 char *snapshot_path;
 833
 834                 snapshot_path = shadow_copy2_snapshot_path(talloc_tos(),
 835                                                            handle,
 836                                                            timestamp);
 837                 if (snapshot_path == NULL) {
 838                         goto fail;
 839                 }
 840
 841                 if (config->rel_connectpath == NULL) {
 842                         converted = talloc_asprintf(mem_ctx, "%s/%s",
 843                                                     snapshot_path, name);
 844                 } else {
 845                         converted = talloc_asprintf(mem_ctx, "%s/%s/%s",
 846                                                     snapshot_path,
 847                                                     config->rel_connectpath,
 848                                                     name);
 849                 }
 850                 if (converted == NULL) {
 851                         goto fail;
 852                 }
 853
 854                 ZERO_STRUCT(converted_fname);
 855                 converted_fname.base_name = converted;
 856
 857                 ret = SMB_VFS_NEXT_LSTAT(handle, &converted_fname);
 858                 DEBUG(10, ("Trying[not snapdirseverywhere] %s: %d (%s)\n",
 859                            converted,
 860                            ret, ret == 0 ? "ok" : strerror(errno)));
 861                 if (ret == 0) {
 862                         DEBUG(10, ("Found %s\n", converted));
 863                         result = converted;
 864                         converted = NULL;
 865                         if (snaproot_len != NULL) {
 866                                 *snaproot_len = strlen(snapshot_path);
 867                                 if (config->rel_connectpath != NULL) {
 868                                         *snaproot_len +=
 869                                             strlen(config->rel_connectpath) + 1;
 870                                 }
 871                         }
 872                         goto fail;
 873                 } else {
 874                         errno = ENOENT;
 875                         goto fail;
 876                 }
 877                 /* never reached ... */
 878         }
 879
 880         connectlen = strlen(handle->conn->connectpath);
 881         if (name[0] == 0) {
 882                 path = talloc_strdup(mem_ctx, handle->conn->connectpath);
 883         } else {
 884                 path = talloc_asprintf(
 885                         mem_ctx, "%s/%s", handle->conn->connectpath, name);
 886         }
 887         if (path == NULL) {
 888                 errno = ENOMEM;
 889                 goto fail;
 890         }
 891         pathlen = talloc_get_size(path)-1;
 892
 893         if (!shadow_copy2_find_slashes(talloc_tos(), path,
 894                                        &slashes, &num_slashes)) {
 895                 goto fail;
 896         }
 897
 898         insert = shadow_copy2_insert_string(talloc_tos(), handle, timestamp);
 899         if (insert == NULL) {
 900                 goto fail;
 901         }
 902         insertlen = talloc_get_size(insert)-1;
 903
 904         /*
 905          * Note: We deliberatly don't expensively initialize the
 906          * array with talloc_zero here: Putting zero into
 907          * converted[pathlen+insertlen] below is sufficient, because
 908          * in the following for loop, the insert string is inserted
 909          * at various slash places. So the memory up to position
 910          * pathlen+insertlen will always be initialized when the
 911          * converted string is used.
 912          */
 913         converted = talloc_array(mem_ctx, char, pathlen + insertlen + 1);
 914         if (converted == NULL) {
 915                 goto fail;
 916         }
 917
 918         if (path[pathlen-1] != '/') {
 919                 /*
 920                  * Append a fake slash to find the snapshot root
 921                  */
 922                 size_t *tmp;
 923                 tmp = talloc_realloc(talloc_tos(), slashes,
 924                                      size_t, num_slashes+1);
 925                 if (tmp == NULL) {
 926                         goto fail;
 927                 }
 928                 slashes = tmp;
 929                 slashes[num_slashes] = pathlen;
 930                 num_slashes += 1;
 931         }
 932
 933         min_offset = 0;
 934
 935         if (!config->crossmountpoints) {
 936                 min_offset = strlen(config->mount_point);
 937         }
 938
 939         memcpy(converted, path, pathlen+1);
 940         converted[pathlen+insertlen] = '\0';
 941
 942         ZERO_STRUCT(converted_fname);
 943         converted_fname.base_name = converted;
 944
 945         for (i = num_slashes-1; i>=0; i--) {
 946                 int ret;
 947                 size_t offset;
 948
 949                 offset = slashes[i];
 950
 951                 if (offset < min_offset) {
 952                         errno = ENOENT;
 953                         goto fail;
 954                 }
 955
 956                 if (offset >= connectlen) {
 957                         in_share_offset = offset;
 958                 }
 959
 960                 memcpy(converted+offset, insert, insertlen);
 961
 962                 offset += insertlen;
 963                 memcpy(converted+offset, path + slashes[i],
 964                        pathlen - slashes[i]);
 965
 966                 ret = SMB_VFS_NEXT_LSTAT(handle, &converted_fname);
 967
 968                 DEBUG(10, ("Trying[snapdirseverywhere] %s: %d (%s)\n",
 969                            converted,
 970                            ret, ret == 0 ? "ok" : strerror(errno)));
 971                 if (ret == 0) {
 972                         /* success */
 973                         if (snaproot_len != NULL) {
 974                                 *snaproot_len = in_share_offset + insertlen;
 975                         }
 976                         break;
 977                 }
 978                 if (errno == ENOTDIR) {
 979                         /*
 980                          * This is a valid condition: We appended the
 981                          * .snaphots/@GMT.. to a file name. Just try
 982                          * with the upper levels.
 983                          */
 984                         continue;
 985                 }
 986                 if (errno != ENOENT) {
 987                         /* Other problem than "not found" */
 988                         goto fail;
 989                 }
 990         }
 991
 992         if (i >= 0) {
 993                 /*
 994                  * Found something
 995                  */
 996                 DEBUG(10, ("Found %s\n", converted));
 997                 result = converted;
 998                 converted = NULL;
 999         } else {
1000                 errno = ENOENT;
1001         }
1002 fail:
1003         if (result == NULL) {
1004                 saved_errno = errno;
1005         }
1006         TALLOC_FREE(converted);
1007         TALLOC_FREE(insert);
1008         TALLOC_FREE(slashes);
1009         TALLOC_FREE(path);
1010         if (saved_errno != 0) {
1011                 errno = saved_errno;
1012         }
1013         return result;
1014 }
1015
1016 /**
1017  * Convert from a name as handed in via the SMB layer
1018  * and a timestamp into the local path of the snapshot
1019  * of the provided file at the provided time.
1020  */
1021 static char *shadow_copy2_convert(TALLOC_CTX *mem_ctx,
1022                                   struct vfs_handle_struct *handle,
1023                                   const char *name, time_t timestamp)
1024 {
1025         return shadow_copy2_do_convert(mem_ctx, handle, name, timestamp, NULL);
1026 }
1027
1028 /*
1029   modify a sbuf return to ensure that inodes in the shadow directory
1030   are different from those in the main directory
1031  */
1032 static void convert_sbuf(vfs_handle_struct *handle, const char *fname,
1033                          SMB_STRUCT_STAT *sbuf)
1034 {
1035         struct shadow_copy2_private *priv;
1036
1037         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1038                                 return);
1039
1040         if (priv->config->fixinodes) {
1041                 /* some snapshot systems, like GPFS, return the name
1042                    device:inode for the snapshot files as the current
1043                    files. That breaks the 'restore' button in the shadow copy
1044                    GUI, as the client gets a sharing violation.
1045
1046                    This is a crude way of allowing both files to be
1047                    open at once. It has a slight chance of inode
1048                    number collision, but I can't see a better approach
1049                    without significant VFS changes
1050                 */
1051                 TDB_DATA key = { .dptr = discard_const_p(uint8_t, fname),
1052                                  .dsize = strlen(fname) };
1053                 uint32_t shash;
1054
1055                 shash = tdb_jenkins_hash(&key) & 0xFF000000;
1056                 if (shash == 0) {
1057                         shash = 1;
1058                 }
1059                 sbuf->st_ex_ino ^= shash;
1060         }
1061 }
1062
1063 static DIR *shadow_copy2_opendir(vfs_handle_struct *handle,
1064                         const struct smb_filename *smb_fname,
1065                         const char *mask,
1066                         uint32_t attr)
1067 {
1068         time_t timestamp = 0;
1069         char *stripped = NULL;
1070         DIR *ret;
1071         int saved_errno = 0;
1072         char *conv;
1073         struct smb_filename *conv_smb_fname = NULL;
1074
1075         if (!shadow_copy2_strip_snapshot(talloc_tos(),
1076                                 handle,
1077                                 smb_fname->base_name,
1078                                 &timestamp,
1079                                 &stripped)) {
1080                 return NULL;
1081         }
1082         if (timestamp == 0) {
1083                 return SMB_VFS_NEXT_OPENDIR(handle, smb_fname, mask, attr);
1084         }
1085         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1086         TALLOC_FREE(stripped);
1087         if (conv == NULL) {
1088                 return NULL;
1089         }
1090         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
1091                                         conv,
1092                                         NULL,
1093                                         NULL,
1094                                         smb_fname->flags);
1095         if (conv_smb_fname == NULL) {
1096                 TALLOC_FREE(conv);
1097                 return NULL;
1098         }
1099         ret = SMB_VFS_NEXT_OPENDIR(handle, conv_smb_fname, mask, attr);
1100         if (ret == NULL) {
1101                 saved_errno = errno;
1102         }
1103         TALLOC_FREE(conv);
1104         TALLOC_FREE(conv_smb_fname);
1105         if (saved_errno != 0) {
1106                 errno = saved_errno;
1107         }
1108         return ret;
1109 }
1110
1111 static int shadow_copy2_rename(vfs_handle_struct *handle,
1112                                const struct smb_filename *smb_fname_src,
1113                                const struct smb_filename *smb_fname_dst)
1114 {
1115         time_t timestamp_src = 0;
1116         time_t timestamp_dst = 0;
1117         char *snappath_src = NULL;
1118         char *snappath_dst = NULL;
1119
1120         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(), handle,
1121                                          smb_fname_src->base_name,
1122                                          &timestamp_src, NULL, &snappath_src)) {
1123                 return -1;
1124         }
1125         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(), handle,
1126                                          smb_fname_dst->base_name,
1127                                          &timestamp_dst, NULL, &snappath_dst)) {
1128                 return -1;
1129         }
1130         if (timestamp_src != 0) {
1131                 errno = EXDEV;
1132                 return -1;
1133         }
1134         if (timestamp_dst != 0) {
1135                 errno = EROFS;
1136                 return -1;
1137         }
1138         /*
1139          * Don't allow rename on already converted paths.
1140          */
1141         if (snappath_src != NULL) {
1142                 errno = EXDEV;
1143                 return -1;
1144         }
1145         if (snappath_dst != NULL) {
1146                 errno = EROFS;
1147                 return -1;
1148         }
1149         return SMB_VFS_NEXT_RENAME(handle, smb_fname_src, smb_fname_dst);
1150 }
1151
1152 static int shadow_copy2_symlink(vfs_handle_struct *handle,
1153                         const char *link_contents,
1154                         const struct smb_filename *new_smb_fname)
1155 {
1156         time_t timestamp_old = 0;
1157         time_t timestamp_new = 0;
1158         char *snappath_old = NULL;
1159         char *snappath_new = NULL;
1160
1161         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
1162                                 handle,
1163                                 link_contents,
1164                                 &timestamp_old,
1165                                 NULL,
1166                                 &snappath_old)) {
1167                 return -1;
1168         }
1169         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
1170                                 handle,
1171                                 new_smb_fname->base_name,
1172                                 &timestamp_new,
1173                                 NULL,
1174                                 &snappath_new)) {
1175                 return -1;
1176         }
1177         if ((timestamp_old != 0) || (timestamp_new != 0)) {
1178                 errno = EROFS;
1179                 return -1;
1180         }
1181         /*
1182          * Don't allow symlinks on already converted paths.
1183          */
1184         if ((snappath_old != NULL) || (snappath_new != NULL)) {
1185                 errno = EROFS;
1186                 return -1;
1187         }
1188         return SMB_VFS_NEXT_SYMLINK(handle, link_contents, new_smb_fname);
1189 }
1190
1191 static int shadow_copy2_link(vfs_handle_struct *handle,
1192                         const struct smb_filename *old_smb_fname,
1193                         const struct smb_filename *new_smb_fname)
1194 {
1195         time_t timestamp_old = 0;
1196         time_t timestamp_new = 0;
1197         char *snappath_old = NULL;
1198         char *snappath_new = NULL;
1199
1200         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
1201                                 handle,
1202                                 old_smb_fname->base_name,
1203                                 &timestamp_old,
1204                                 NULL,
1205                                 &snappath_old)) {
1206                 return -1;
1207         }
1208         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
1209                                 handle,
1210                                 new_smb_fname->base_name,
1211                                 &timestamp_new,
1212                                 NULL,
1213                                 &snappath_new)) {
1214                 return -1;
1215         }
1216         if ((timestamp_old != 0) || (timestamp_new != 0)) {
1217                 errno = EROFS;
1218                 return -1;
1219         }
1220         /*
1221          * Don't allow links on already converted paths.
1222          */
1223         if ((snappath_old != NULL) || (snappath_new != NULL)) {
1224                 errno = EROFS;
1225                 return -1;
1226         }
1227         return SMB_VFS_NEXT_LINK(handle, old_smb_fname, new_smb_fname);
1228 }
1229
1230 static int shadow_copy2_stat(vfs_handle_struct *handle,
1231                              struct smb_filename *smb_fname)
1232 {
1233         time_t timestamp = 0;
1234         char *stripped = NULL;
1235         char *tmp;
1236         int saved_errno = 0;
1237         int ret;
1238
1239         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1240                                          smb_fname->base_name,
1241                                          &timestamp, &stripped)) {
1242                 return -1;
1243         }
1244         if (timestamp == 0) {
1245                 return SMB_VFS_NEXT_STAT(handle, smb_fname);
1246         }
1247
1248         tmp = smb_fname->base_name;
1249         smb_fname->base_name = shadow_copy2_convert(
1250                 talloc_tos(), handle, stripped, timestamp);
1251         TALLOC_FREE(stripped);
1252
1253         if (smb_fname->base_name == NULL) {
1254                 smb_fname->base_name = tmp;
1255                 return -1;
1256         }
1257
1258         ret = SMB_VFS_NEXT_STAT(handle, smb_fname);
1259         if (ret == -1) {
1260                 saved_errno = errno;
1261         }
1262
1263         TALLOC_FREE(smb_fname->base_name);
1264         smb_fname->base_name = tmp;
1265
1266         if (ret == 0) {
1267                 convert_sbuf(handle, smb_fname->base_name, &smb_fname->st);
1268         }
1269         if (saved_errno != 0) {
1270                 errno = saved_errno;
1271         }
1272         return ret;
1273 }
1274
1275 static int shadow_copy2_lstat(vfs_handle_struct *handle,
1276                               struct smb_filename *smb_fname)
1277 {
1278         time_t timestamp = 0;
1279         char *stripped = NULL;
1280         char *tmp;
1281         int saved_errno = 0;
1282         int ret;
1283
1284         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1285                                          smb_fname->base_name,
1286                                          &timestamp, &stripped)) {
1287                 return -1;
1288         }
1289         if (timestamp == 0) {
1290                 return SMB_VFS_NEXT_LSTAT(handle, smb_fname);
1291         }
1292
1293         tmp = smb_fname->base_name;
1294         smb_fname->base_name = shadow_copy2_convert(
1295                 talloc_tos(), handle, stripped, timestamp);
1296         TALLOC_FREE(stripped);
1297
1298         if (smb_fname->base_name == NULL) {
1299                 smb_fname->base_name = tmp;
1300                 return -1;
1301         }
1302
1303         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
1304         if (ret == -1) {
1305                 saved_errno = errno;
1306         }
1307
1308         TALLOC_FREE(smb_fname->base_name);
1309         smb_fname->base_name = tmp;
1310
1311         if (ret == 0) {
1312                 convert_sbuf(handle, smb_fname->base_name, &smb_fname->st);
1313         }
1314         if (saved_errno != 0) {
1315                 errno = saved_errno;
1316         }
1317         return ret;
1318 }
1319
1320 static int shadow_copy2_fstat(vfs_handle_struct *handle, files_struct *fsp,
1321                               SMB_STRUCT_STAT *sbuf)
1322 {
1323         time_t timestamp = 0;
1324         int ret;
1325
1326         ret = SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
1327         if (ret == -1) {
1328                 return ret;
1329         }
1330         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1331                                          fsp->fsp_name->base_name,
1332                                          &timestamp, NULL)) {
1333                 return 0;
1334         }
1335         if (timestamp != 0) {
1336                 convert_sbuf(handle, fsp->fsp_name->base_name, sbuf);
1337         }
1338         return 0;
1339 }
1340
1341 static int shadow_copy2_open(vfs_handle_struct *handle,
1342                              struct smb_filename *smb_fname, files_struct *fsp,
1343                              int flags, mode_t mode)
1344 {
1345         time_t timestamp = 0;
1346         char *stripped = NULL;
1347         char *tmp;
1348         int saved_errno = 0;
1349         int ret;
1350
1351         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1352                                          smb_fname->base_name,
1353                                          &timestamp, &stripped)) {
1354                 return -1;
1355         }
1356         if (timestamp == 0) {
1357                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
1358         }
1359
1360         tmp = smb_fname->base_name;
1361         smb_fname->base_name = shadow_copy2_convert(
1362                 talloc_tos(), handle, stripped, timestamp);
1363         TALLOC_FREE(stripped);
1364
1365         if (smb_fname->base_name == NULL) {
1366                 smb_fname->base_name = tmp;
1367                 return -1;
1368         }
1369
1370         ret = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
1371         if (ret == -1) {
1372                 saved_errno = errno;
1373         }
1374
1375         TALLOC_FREE(smb_fname->base_name);
1376         smb_fname->base_name = tmp;
1377
1378         if (saved_errno != 0) {
1379                 errno = saved_errno;
1380         }
1381         return ret;
1382 }
1383
1384 static int shadow_copy2_unlink(vfs_handle_struct *handle,
1385                                const struct smb_filename *smb_fname)
1386 {
1387         time_t timestamp = 0;
1388         char *stripped = NULL;
1389         int saved_errno = 0;
1390         int ret;
1391         struct smb_filename *conv;
1392
1393         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1394                                          smb_fname->base_name,
1395                                          &timestamp, &stripped)) {
1396                 return -1;
1397         }
1398         if (timestamp == 0) {
1399                 return SMB_VFS_NEXT_UNLINK(handle, smb_fname);
1400         }
1401         conv = cp_smb_filename(talloc_tos(), smb_fname);
1402         if (conv == NULL) {
1403                 errno = ENOMEM;
1404                 return -1;
1405         }
1406         conv->base_name = shadow_copy2_convert(
1407                 conv, handle, stripped, timestamp);
1408         TALLOC_FREE(stripped);
1409         if (conv->base_name == NULL) {
1410                 return -1;
1411         }
1412         ret = SMB_VFS_NEXT_UNLINK(handle, conv);
1413         if (ret == -1) {
1414                 saved_errno = errno;
1415         }
1416         TALLOC_FREE(conv);
1417         if (saved_errno != 0) {
1418                 errno = saved_errno;
1419         }
1420         return ret;
1421 }
1422
1423 static int shadow_copy2_chmod(vfs_handle_struct *handle,
1424                         const struct smb_filename *smb_fname,
1425                         mode_t mode)
1426 {
1427         time_t timestamp = 0;
1428         char *stripped = NULL;
1429         int saved_errno = 0;
1430         int ret;
1431         char *conv = NULL;
1432         struct smb_filename *conv_smb_fname;
1433
1434         if (!shadow_copy2_strip_snapshot(talloc_tos(),
1435                                 handle,
1436                                 smb_fname->base_name,
1437                                 &timestamp,
1438                                 &stripped)) {
1439                 return -1;
1440         }
1441         if (timestamp == 0) {
1442                 TALLOC_FREE(stripped);
1443                 return SMB_VFS_NEXT_CHMOD(handle, smb_fname, mode);
1444         }
1445         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1446         TALLOC_FREE(stripped);
1447         if (conv == NULL) {
1448                 return -1;
1449         }
1450         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
1451                                         conv,
1452                                         NULL,
1453                                         NULL,
1454                                         smb_fname->flags);
1455         if (conv_smb_fname == NULL) {
1456                 TALLOC_FREE(conv);
1457                 errno = ENOMEM;
1458                 return -1;
1459         }
1460
1461         ret = SMB_VFS_NEXT_CHMOD(handle, conv_smb_fname, mode);
1462         if (ret == -1) {
1463                 saved_errno = errno;
1464         }
1465         TALLOC_FREE(conv);
1466         TALLOC_FREE(conv_smb_fname);
1467         if (saved_errno != 0) {
1468                 errno = saved_errno;
1469         }
1470         return ret;
1471 }
1472
1473 static int shadow_copy2_chown(vfs_handle_struct *handle,
1474                         const struct smb_filename *smb_fname,
1475                         uid_t uid,
1476                         gid_t gid)
1477 {
1478         time_t timestamp = 0;
1479         char *stripped = NULL;
1480         int saved_errno = 0;
1481         int ret;
1482         char *conv = NULL;
1483         struct smb_filename *conv_smb_fname = NULL;
1484
1485         if (!shadow_copy2_strip_snapshot(talloc_tos(),
1486                                 handle,
1487                                 smb_fname->base_name,
1488                                 &timestamp,
1489                                 &stripped)) {
1490                 return -1;
1491         }
1492         if (timestamp == 0) {
1493                 return SMB_VFS_NEXT_CHOWN(handle, smb_fname, uid, gid);
1494         }
1495         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1496         TALLOC_FREE(stripped);
1497         if (conv == NULL) {
1498                 return -1;
1499         }
1500         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
1501                                         conv,
1502                                         NULL,
1503                                         NULL,
1504                                         smb_fname->flags);
1505         if (conv_smb_fname == NULL) {
1506                 TALLOC_FREE(conv);
1507                 errno = ENOMEM;
1508                 return -1;
1509         }
1510         ret = SMB_VFS_NEXT_CHOWN(handle, conv_smb_fname, uid, gid);
1511         if (ret == -1) {
1512                 saved_errno = errno;
1513         }
1514         TALLOC_FREE(conv);
1515         TALLOC_FREE(conv_smb_fname);
1516         if (saved_errno != 0) {
1517                 errno = saved_errno;
1518         }
1519         return ret;
1520 }
1521
1522 static void store_cwd_data(vfs_handle_struct *handle,
1523                                 const char *connectpath)
1524 {
1525         struct shadow_copy2_private *priv = NULL;
1526         char *cwd = NULL;
1527
1528         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1529                                 return);
1530
1531         TALLOC_FREE(priv->shadow_cwd);
1532         cwd = SMB_VFS_NEXT_GETWD(handle);
1533         if (cwd == NULL) {
1534                 smb_panic("getwd failed\n");
1535         }
1536         DBG_DEBUG("shadow cwd = %s\n", cwd);
1537         priv->shadow_cwd = talloc_strdup(priv, cwd);
1538         SAFE_FREE(cwd);
1539         if (priv->shadow_cwd == NULL) {
1540                 smb_panic("talloc failed\n");
1541         }
1542         TALLOC_FREE(priv->shadow_connectpath);
1543         if (connectpath) {
1544                 DBG_DEBUG("shadow conectpath = %s\n", connectpath);
1545                 priv->shadow_connectpath = talloc_strdup(priv, connectpath);
1546                 if (priv->shadow_connectpath == NULL) {
1547                         smb_panic("talloc failed\n");
1548                 }
1549         }
1550 }
1551
1552 static int shadow_copy2_chdir(vfs_handle_struct *handle,
1553                               const char *fname)
1554 {
1555         time_t timestamp = 0;
1556         char *stripped = NULL;
1557         char *snappath = NULL;
1558         int ret = -1;
1559         int saved_errno = 0;
1560         char *conv = NULL;
1561         size_t rootpath_len = 0;
1562
1563         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(), handle, fname,
1564                                         &timestamp, &stripped, &snappath)) {
1565                 return -1;
1566         }
1567         if (stripped != NULL) {
1568                 conv = shadow_copy2_do_convert(talloc_tos(),
1569                                                 handle,
1570                                                 stripped,
1571                                                 timestamp,
1572                                                 &rootpath_len);
1573                 TALLOC_FREE(stripped);
1574                 if (conv == NULL) {
1575                         return -1;
1576                 }
1577                 fname = conv;
1578         }
1579
1580         ret = SMB_VFS_NEXT_CHDIR(handle, fname);
1581         if (ret == -1) {
1582                 saved_errno = errno;
1583         }
1584
1585         if (ret == 0) {
1586                 if (conv != NULL && rootpath_len != 0) {
1587                         conv[rootpath_len] = '\0';
1588                 } else if (snappath != 0) {
1589                         TALLOC_FREE(conv);
1590                         conv = snappath;
1591                 }
1592                 store_cwd_data(handle, conv);
1593         }
1594
1595         TALLOC_FREE(stripped);
1596         TALLOC_FREE(conv);
1597
1598         if (saved_errno != 0) {
1599                 errno = saved_errno;
1600         }
1601         return ret;
1602 }
1603
1604 static int shadow_copy2_ntimes(vfs_handle_struct *handle,
1605                                const struct smb_filename *smb_fname,
1606                                struct smb_file_time *ft)
1607 {
1608         time_t timestamp = 0;
1609         char *stripped = NULL;
1610         int saved_errno = 0;
1611         int ret;
1612         struct smb_filename *conv;
1613
1614         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1615                                          smb_fname->base_name,
1616                                          &timestamp, &stripped)) {
1617                 return -1;
1618         }
1619         if (timestamp == 0) {
1620                 return SMB_VFS_NEXT_NTIMES(handle, smb_fname, ft);
1621         }
1622         conv = cp_smb_filename(talloc_tos(), smb_fname);
1623         if (conv == NULL) {
1624                 errno = ENOMEM;
1625                 return -1;
1626         }
1627         conv->base_name = shadow_copy2_convert(
1628                 conv, handle, stripped, timestamp);
1629         TALLOC_FREE(stripped);
1630         if (conv->base_name == NULL) {
1631                 return -1;
1632         }
1633         ret = SMB_VFS_NEXT_NTIMES(handle, conv, ft);
1634         if (ret == -1) {
1635                 saved_errno = errno;
1636         }
1637         TALLOC_FREE(conv);
1638         if (saved_errno != 0) {
1639                 errno = saved_errno;
1640         }
1641         return ret;
1642 }
1643
1644 static int shadow_copy2_readlink(vfs_handle_struct *handle,
1645                                 const struct smb_filename *smb_fname,
1646                                 char *buf,
1647                                 size_t bufsiz)
1648 {
1649         time_t timestamp = 0;
1650         char *stripped = NULL;
1651         int saved_errno = 0;
1652         int ret;
1653         struct smb_filename *conv = NULL;
1654
1655         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1656                                          smb_fname->base_name,
1657                                          &timestamp, &stripped)) {
1658                 return -1;
1659         }
1660         if (timestamp == 0) {
1661                 return SMB_VFS_NEXT_READLINK(handle, smb_fname, buf, bufsiz);
1662         }
1663         conv = cp_smb_filename(talloc_tos(), smb_fname);
1664         if (conv == NULL) {
1665                 TALLOC_FREE(stripped);
1666                 errno = ENOMEM;
1667                 return -1;
1668         }
1669         conv->base_name = shadow_copy2_convert(
1670                 conv, handle, stripped, timestamp);
1671         TALLOC_FREE(stripped);
1672         if (conv->base_name == NULL) {
1673                 return -1;
1674         }
1675         ret = SMB_VFS_NEXT_READLINK(handle, conv, buf, bufsiz);
1676         if (ret == -1) {
1677                 saved_errno = errno;
1678         }
1679         TALLOC_FREE(conv);
1680         if (saved_errno != 0) {
1681                 errno = saved_errno;
1682         }
1683         return ret;
1684 }
1685
1686 static int shadow_copy2_mknod(vfs_handle_struct *handle,
1687                                 const struct smb_filename *smb_fname,
1688                                 mode_t mode,
1689                                 SMB_DEV_T dev)
1690 {
1691         time_t timestamp = 0;
1692         char *stripped = NULL;
1693         int saved_errno = 0;
1694         int ret;
1695         struct smb_filename *conv = NULL;
1696
1697         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1698                                          smb_fname->base_name,
1699                                          &timestamp, &stripped)) {
1700                 return -1;
1701         }
1702         if (timestamp == 0) {
1703                 return SMB_VFS_NEXT_MKNOD(handle, smb_fname, mode, dev);
1704         }
1705         conv = cp_smb_filename(talloc_tos(), smb_fname);
1706         if (conv == NULL) {
1707                 errno = ENOMEM;
1708                 return -1;
1709         }
1710         conv->base_name = shadow_copy2_convert(
1711                 conv, handle, stripped, timestamp);
1712         TALLOC_FREE(stripped);
1713         if (conv->base_name == NULL) {
1714                 return -1;
1715         }
1716         ret = SMB_VFS_NEXT_MKNOD(handle, conv, mode, dev);
1717         if (ret == -1) {
1718                 saved_errno = errno;
1719         }
1720         TALLOC_FREE(conv);
1721         if (saved_errno != 0) {
1722                 errno = saved_errno;
1723         }
1724         return ret;
1725 }
1726
1727 static char *shadow_copy2_realpath(vfs_handle_struct *handle,
1728                                    const char *fname)
1729 {
1730         time_t timestamp = 0;
1731         char *stripped = NULL;
1732         char *tmp = NULL;
1733         char *result = NULL;
1734         int saved_errno = 0;
1735
1736         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
1737                                          &timestamp, &stripped)) {
1738                 goto done;
1739         }
1740         if (timestamp == 0) {
1741                 return SMB_VFS_NEXT_REALPATH(handle, fname);
1742         }
1743
1744         tmp = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1745         if (tmp == NULL) {
1746                 goto done;
1747         }
1748
1749         result = SMB_VFS_NEXT_REALPATH(handle, tmp);
1750
1751 done:
1752         if (result == NULL) {
1753                 saved_errno = errno;
1754         }
1755         TALLOC_FREE(tmp);
1756         TALLOC_FREE(stripped);
1757         if (saved_errno != 0) {
1758                 errno = saved_errno;
1759         }
1760         return result;
1761 }
1762
1763 /**
1764  * Check whether a given directory contains a
1765  * snapshot directory as direct subdirectory.
1766  * If yes, return the path of the snapshot-subdir,
1767  * otherwise return NULL.
1768  */
1769 static char *have_snapdir(struct vfs_handle_struct *handle,
1770                           const char *path)
1771 {
1772         struct smb_filename smb_fname;
1773         int ret;
1774         struct shadow_copy2_private *priv;
1775
1776         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1777                                 return NULL);
1778
1779         ZERO_STRUCT(smb_fname);
1780         smb_fname.base_name = talloc_asprintf(talloc_tos(), "%s/%s",
1781                                               path, priv->config->snapdir);
1782         if (smb_fname.base_name == NULL) {
1783                 return NULL;
1784         }
1785
1786         ret = SMB_VFS_NEXT_STAT(handle, &smb_fname);
1787         if ((ret == 0) && (S_ISDIR(smb_fname.st.st_ex_mode))) {
1788                 return smb_fname.base_name;
1789         }
1790         TALLOC_FREE(smb_fname.base_name);
1791         return NULL;
1792 }
1793
1794 static bool check_access_snapdir(struct vfs_handle_struct *handle,
1795                                 const char *path)
1796 {
1797         struct smb_filename smb_fname;
1798         int ret;
1799         NTSTATUS status;
1800
1801         ZERO_STRUCT(smb_fname);
1802         smb_fname.base_name = talloc_asprintf(talloc_tos(),
1803                                                 "%s",
1804                                                 path);
1805         if (smb_fname.base_name == NULL) {
1806                 return false;
1807         }
1808
1809         ret = SMB_VFS_NEXT_STAT(handle, &smb_fname);
1810         if (ret != 0 || !S_ISDIR(smb_fname.st.st_ex_mode)) {
1811                 TALLOC_FREE(smb_fname.base_name);
1812                 return false;
1813         }
1814
1815         status = smbd_check_access_rights(handle->conn,
1816                                         &smb_fname,
1817                                         false,
1818                                         SEC_DIR_LIST);
1819         if (!NT_STATUS_IS_OK(status)) {
1820                 DEBUG(0,("user does not have list permission "
1821                         "on snapdir %s\n",
1822                         smb_fname.base_name));
1823                 TALLOC_FREE(smb_fname.base_name);
1824                 return false;
1825         }
1826         TALLOC_FREE(smb_fname.base_name);
1827         return true;
1828 }
1829
1830 /**
1831  * Find the snapshot directory (if any) for the given
1832  * filename (which is relative to the share).
1833  */
1834 static const char *shadow_copy2_find_snapdir(TALLOC_CTX *mem_ctx,
1835                                              struct vfs_handle_struct *handle,
1836                                              struct smb_filename *smb_fname)
1837 {
1838         char *path, *p;
1839         const char *snapdir;
1840         struct shadow_copy2_config *config;
1841         struct shadow_copy2_private *priv;
1842
1843         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1844                                 return NULL);
1845
1846         config = priv->config;
1847
1848         /*
1849          * If the non-snapdisrseverywhere mode, we should not search!
1850          */
1851         if (!config->snapdirseverywhere) {
1852                 return config->snapshot_basepath;
1853         }
1854
1855         path = talloc_asprintf(mem_ctx, "%s/%s",
1856                                handle->conn->connectpath,
1857                                smb_fname->base_name);
1858         if (path == NULL) {
1859                 return NULL;
1860         }
1861
1862         snapdir = have_snapdir(handle, path);
1863         if (snapdir != NULL) {
1864                 TALLOC_FREE(path);
1865                 return snapdir;
1866         }
1867
1868         while ((p = strrchr(path, '/')) && (p > path)) {
1869
1870                 p[0] = '\0';
1871
1872                 snapdir = have_snapdir(handle, path);
1873                 if (snapdir != NULL) {
1874                         TALLOC_FREE(path);
1875                         return snapdir;
1876                 }
1877         }
1878         TALLOC_FREE(path);
1879         return NULL;
1880 }
1881
1882 static bool shadow_copy2_snapshot_to_gmt(vfs_handle_struct *handle,
1883                                          const char *name,
1884                                          char *gmt, size_t gmt_len)
1885 {
1886         struct tm timestamp;
1887         time_t timestamp_t;
1888         unsigned long int timestamp_long;
1889         const char *fmt;
1890         struct shadow_copy2_config *config;
1891         struct shadow_copy2_private *priv;
1892         char *tmpstr = NULL;
1893         char *tmp = NULL;
1894         bool converted = false;
1895         int ret = -1;
1896
1897         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1898                                 return NULL);
1899
1900         config = priv->config;
1901
1902         fmt = config->gmt_format;
1903
1904         /*
1905          * If regex is provided, then we will have to parse the
1906          * filename which will contain both the prefix and the time format.
1907          * e.g. <prefix><delimiter><time_format>
1908          */
1909         if (priv->snaps->regex != NULL) {
1910                 tmpstr = talloc_strdup(talloc_tos(), name);
1911                 /* point "name" to the time format */
1912                 name = strstr(name, priv->config->delimiter);
1913                 if (name == NULL) {
1914                         goto done;
1915                 }
1916                 /* Extract the prefix */
1917                 tmp = strstr(tmpstr, priv->config->delimiter);
1918                 if (tmp == NULL) {
1919                         goto done;
1920                 }
1921                 *tmp = '\0';
1922
1923                 /* Parse regex */
1924                 ret = regexec(priv->snaps->regex, tmpstr, 0, NULL, 0);
1925                 if (ret) {
1926                         DBG_DEBUG("shadow_copy2_snapshot_to_gmt: "
1927                                   "no regex match for %s\n", tmpstr);
1928                         goto done;
1929                 }
1930         }
1931
1932         ZERO_STRUCT(timestamp);
1933         if (config->use_sscanf) {
1934                 if (sscanf(name, fmt, &timestamp_long) != 1) {
1935                         DEBUG(10, ("shadow_copy2_snapshot_to_gmt: "
1936                                    "no sscanf match %s: %s\n",
1937                                    fmt, name));
1938                         goto done;
1939                 }
1940                 timestamp_t = timestamp_long;
1941                 gmtime_r(&timestamp_t, &timestamp);
1942         } else {
1943                 if (strptime(name, fmt, &timestamp) == NULL) {
1944                         DEBUG(10, ("shadow_copy2_snapshot_to_gmt: "
1945                                    "no match %s: %s\n",
1946                                    fmt, name));
1947                         goto done;
1948                 }
1949                 DEBUG(10, ("shadow_copy2_snapshot_to_gmt: match %s: %s\n",
1950                            fmt, name));
1951
1952                 if (config->use_localtime) {
1953                         timestamp.tm_isdst = -1;
1954                         timestamp_t = mktime(&timestamp);
1955                         gmtime_r(&timestamp_t, &timestamp);
1956                 }
1957         }
1958
1959         strftime(gmt, gmt_len, GMT_FORMAT, &timestamp);
1960         converted = true;
1961
1962 done:
1963         TALLOC_FREE(tmpstr);
1964         return converted;
1965 }
1966
1967 static int shadow_copy2_label_cmp_asc(const void *x, const void *y)
1968 {
1969         return strncmp((const char *)x, (const char *)y, sizeof(SHADOW_COPY_LABEL));
1970 }
1971
1972 static int shadow_copy2_label_cmp_desc(const void *x, const void *y)
1973 {
1974         return -strncmp((const char *)x, (const char *)y, sizeof(SHADOW_COPY_LABEL));
1975 }
1976
1977 /*
1978   sort the shadow copy data in ascending or descending order
1979  */
1980 static void shadow_copy2_sort_data(vfs_handle_struct *handle,
1981                                    struct shadow_copy_data *shadow_copy2_data)
1982 {
1983         int (*cmpfunc)(const void *, const void *);
1984         const char *sort;
1985         struct shadow_copy2_private *priv;
1986
1987         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1988                                 return);
1989
1990         sort = priv->config->sort_order;
1991         if (sort == NULL) {
1992                 return;
1993         }
1994
1995         if (strcmp(sort, "asc") == 0) {
1996                 cmpfunc = shadow_copy2_label_cmp_asc;
1997         } else if (strcmp(sort, "desc") == 0) {
1998                 cmpfunc = shadow_copy2_label_cmp_desc;
1999         } else {
2000                 return;
2001         }
2002
2003         if (shadow_copy2_data && shadow_copy2_data->num_volumes > 0 &&
2004             shadow_copy2_data->labels)
2005         {
2006                 TYPESAFE_QSORT(shadow_copy2_data->labels,
2007                                shadow_copy2_data->num_volumes,
2008                                cmpfunc);
2009         }
2010 }
2011
2012 static int shadow_copy2_get_shadow_copy_data(
2013         vfs_handle_struct *handle, files_struct *fsp,
2014         struct shadow_copy_data *shadow_copy2_data,
2015         bool labels)
2016 {
2017         DIR *p;
2018         const char *snapdir;
2019         struct smb_filename *snapdir_smb_fname = NULL;
2020         struct dirent *d;
2021         TALLOC_CTX *tmp_ctx = talloc_stackframe();
2022         struct shadow_copy2_private *priv = NULL;
2023         struct shadow_copy2_snapentry *tmpentry = NULL;
2024         bool get_snaplist = false;
2025         bool access_granted = false;
2026         int ret = -1;
2027
2028         snapdir = shadow_copy2_find_snapdir(tmp_ctx, handle, fsp->fsp_name);
2029         if (snapdir == NULL) {
2030                 DEBUG(0,("shadow:snapdir not found for %s in get_shadow_copy_data\n",
2031                          handle->conn->connectpath));
2032                 errno = EINVAL;
2033                 goto done;
2034         }
2035
2036         access_granted = check_access_snapdir(handle, snapdir);
2037         if (!access_granted) {
2038                 DEBUG(0,("access denied on listing snapdir %s\n", snapdir));
2039                 errno = EACCES;
2040                 goto done;
2041         }
2042
2043         snapdir_smb_fname = synthetic_smb_fname(talloc_tos(),
2044                                         snapdir,
2045                                         NULL,
2046                                         NULL,
2047                                         fsp->fsp_name->flags);
2048         if (snapdir_smb_fname == NULL) {
2049                 errno = ENOMEM;
2050                 goto done;
2051         }
2052
2053         p = SMB_VFS_NEXT_OPENDIR(handle, snapdir_smb_fname, NULL, 0);
2054
2055         if (!p) {
2056                 DEBUG(2,("shadow_copy2: SMB_VFS_NEXT_OPENDIR() failed for '%s'"
2057                          " - %s\n", snapdir, strerror(errno)));
2058                 errno = ENOSYS;
2059                 goto done;
2060         }
2061
2062         if (shadow_copy2_data != NULL) {
2063                 shadow_copy2_data->num_volumes = 0;
2064                 shadow_copy2_data->labels      = NULL;
2065         }
2066
2067         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
2068                                 goto done);
2069
2070         /*
2071          * Normally this function is called twice once with labels = false and
2072          * then with labels = true. When labels is false it will return the
2073          * number of volumes so that the caller can allocate memory for that
2074          * many labels. Therefore to eliminate snaplist both the times it is
2075          * good to check if labels is set or not.
2076          *
2077          * shadow_copy2_data is NULL when we only want to update the list and
2078          * don't want any labels.
2079          */
2080         if ((priv->snaps->regex != NULL) && (labels || shadow_copy2_data == NULL)) {
2081                 get_snaplist = true;
2082                 /* Reset the global snaplist */
2083                 shadow_copy2_delete_snaplist(priv);
2084
2085                 /* Set the current time as snaplist update time */
2086                 time(&(priv->snaps->fetch_time));
2087         }
2088
2089         while ((d = SMB_VFS_NEXT_READDIR(handle, p, NULL))) {
2090                 char snapshot[GMT_NAME_LEN+1];
2091                 SHADOW_COPY_LABEL *tlabels;
2092
2093                 /*
2094                  * ignore names not of the right form in the snapshot
2095                  * directory
2096                  */
2097                 if (!shadow_copy2_snapshot_to_gmt(
2098                             handle, d->d_name,
2099                             snapshot, sizeof(snapshot))) {
2100
2101                         DEBUG(6, ("shadow_copy2_get_shadow_copy_data: "
2102                                   "ignoring %s\n", d->d_name));
2103                         continue;
2104                 }
2105                 DEBUG(6,("shadow_copy2_get_shadow_copy_data: %s -> %s\n",
2106                          d->d_name, snapshot));
2107
2108                 if (get_snaplist) {
2109                         /*
2110                          * Create a snap entry for each successful
2111                          * pattern match.
2112                          */
2113                         tmpentry = shadow_copy2_create_snapentry(priv);
2114                         if (tmpentry == NULL) {
2115                                 DBG_ERR("talloc_zero() failed\n");
2116                                 goto done;
2117                         }
2118                         tmpentry->snapname = talloc_strdup(tmpentry, d->d_name);
2119                         tmpentry->time_fmt = talloc_strdup(tmpentry, snapshot);
2120                 }
2121
2122                 if (shadow_copy2_data == NULL) {
2123                         continue;
2124                 }
2125
2126                 if (!labels) {
2127                         /* the caller doesn't want the labels */
2128                         shadow_copy2_data->num_volumes++;
2129                         continue;
2130                 }
2131
2132                 tlabels = talloc_realloc(shadow_copy2_data,
2133                                          shadow_copy2_data->labels,
2134                                          SHADOW_COPY_LABEL,
2135                                          shadow_copy2_data->num_volumes+1);
2136                 if (tlabels == NULL) {
2137                         DEBUG(0,("shadow_copy2: out of memory\n"));
2138                         SMB_VFS_NEXT_CLOSEDIR(handle, p);
2139                         goto done;
2140                 }
2141
2142                 strlcpy(tlabels[shadow_copy2_data->num_volumes], snapshot,
2143                         sizeof(*tlabels));
2144
2145                 shadow_copy2_data->num_volumes++;
2146                 shadow_copy2_data->labels = tlabels;
2147         }
2148
2149         SMB_VFS_NEXT_CLOSEDIR(handle,p);
2150
2151         shadow_copy2_sort_data(handle, shadow_copy2_data);
2152         ret = 0;
2153
2154 done:
2155         TALLOC_FREE(tmp_ctx);
2156         return ret;
2157 }
2158
2159 static NTSTATUS shadow_copy2_fget_nt_acl(vfs_handle_struct *handle,
2160                                         struct files_struct *fsp,
2161                                         uint32_t security_info,
2162                                          TALLOC_CTX *mem_ctx,
2163                                         struct security_descriptor **ppdesc)
2164 {
2165         time_t timestamp = 0;
2166         char *stripped = NULL;
2167         NTSTATUS status;
2168         char *conv;
2169         struct smb_filename *smb_fname = NULL;
2170
2171         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
2172                                          fsp->fsp_name->base_name,
2173                                          &timestamp, &stripped)) {
2174                 return map_nt_error_from_unix(errno);
2175         }
2176         if (timestamp == 0) {
2177                 return SMB_VFS_NEXT_FGET_NT_ACL(handle, fsp, security_info,
2178                                                 mem_ctx,
2179                                                 ppdesc);
2180         }
2181         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2182         TALLOC_FREE(stripped);
2183         if (conv == NULL) {
2184                 return map_nt_error_from_unix(errno);
2185         }
2186         smb_fname = synthetic_smb_fname(talloc_tos(),
2187                                         conv,
2188                                         NULL,
2189                                         NULL,
2190                                         fsp->fsp_name->flags);
2191         if (smb_fname == NULL) {
2192                 TALLOC_FREE(conv);
2193                 return NT_STATUS_NO_MEMORY;
2194         }
2195
2196         status = SMB_VFS_NEXT_GET_NT_ACL(handle, smb_fname, security_info,
2197                                          mem_ctx, ppdesc);
2198         TALLOC_FREE(conv);
2199         TALLOC_FREE(smb_fname);
2200         return status;
2201 }
2202
2203 static NTSTATUS shadow_copy2_get_nt_acl(vfs_handle_struct *handle,
2204                                         const struct smb_filename *smb_fname,
2205                                         uint32_t security_info,
2206                                         TALLOC_CTX *mem_ctx,
2207                                         struct security_descriptor **ppdesc)
2208 {
2209         time_t timestamp = 0;
2210         char *stripped = NULL;
2211         NTSTATUS status;
2212         char *conv;
2213         struct smb_filename *conv_smb_fname = NULL;
2214
2215         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2216                                         handle,
2217                                         smb_fname->base_name,
2218                                         &timestamp,
2219                                         &stripped)) {
2220                 return map_nt_error_from_unix(errno);
2221         }
2222         if (timestamp == 0) {
2223                 return SMB_VFS_NEXT_GET_NT_ACL(handle, smb_fname, security_info,
2224                                                mem_ctx, ppdesc);
2225         }
2226         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2227         TALLOC_FREE(stripped);
2228         if (conv == NULL) {
2229                 return map_nt_error_from_unix(errno);
2230         }
2231         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2232                                         conv,
2233                                         NULL,
2234                                         NULL,
2235                                         smb_fname->flags);
2236         if (conv_smb_fname == NULL) {
2237                 TALLOC_FREE(conv);
2238                 return NT_STATUS_NO_MEMORY;
2239         }
2240         status = SMB_VFS_NEXT_GET_NT_ACL(handle, conv_smb_fname, security_info,
2241                                          mem_ctx, ppdesc);
2242         TALLOC_FREE(conv);
2243         TALLOC_FREE(conv_smb_fname);
2244         return status;
2245 }
2246
2247 static int shadow_copy2_mkdir(vfs_handle_struct *handle,
2248                                 const struct smb_filename *smb_fname,
2249                                 mode_t mode)
2250 {
2251         time_t timestamp = 0;
2252         char *stripped = NULL;
2253         int saved_errno = 0;
2254         int ret;
2255         char *conv;
2256         struct smb_filename *conv_smb_fname = NULL;
2257
2258         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2259                                         handle,
2260                                         smb_fname->base_name,
2261                                         &timestamp,
2262                                         &stripped)) {
2263                 return -1;
2264         }
2265         if (timestamp == 0) {
2266                 return SMB_VFS_NEXT_MKDIR(handle, smb_fname, mode);
2267         }
2268         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2269         TALLOC_FREE(stripped);
2270         if (conv == NULL) {
2271                 return -1;
2272         }
2273         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2274                                         conv,
2275                                         NULL,
2276                                         NULL,
2277                                         smb_fname->flags);
2278         if (conv_smb_fname == NULL) {
2279                 TALLOC_FREE(conv);
2280                 return -1;
2281         }
2282         ret = SMB_VFS_NEXT_MKDIR(handle, conv_smb_fname, mode);
2283         if (ret == -1) {
2284                 saved_errno = errno;
2285         }
2286         TALLOC_FREE(conv);
2287         TALLOC_FREE(conv_smb_fname);
2288         if (saved_errno != 0) {
2289                 errno = saved_errno;
2290         }
2291         return ret;
2292 }
2293
2294 static int shadow_copy2_rmdir(vfs_handle_struct *handle,
2295                                 const struct smb_filename *smb_fname)
2296 {
2297         time_t timestamp = 0;
2298         char *stripped = NULL;
2299         int saved_errno = 0;
2300         int ret;
2301         char *conv;
2302         struct smb_filename *conv_smb_fname = NULL;
2303
2304         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2305                                         handle,
2306                                         smb_fname->base_name,
2307                                         &timestamp,
2308                                         &stripped)) {
2309                 return -1;
2310         }
2311         if (timestamp == 0) {
2312                 return SMB_VFS_NEXT_RMDIR(handle, smb_fname);
2313         }
2314         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2315         TALLOC_FREE(stripped);
2316         if (conv == NULL) {
2317                 return -1;
2318         }
2319         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2320                                         conv,
2321                                         NULL,
2322                                         NULL,
2323                                         smb_fname->flags);
2324         if (conv_smb_fname == NULL) {
2325                 TALLOC_FREE(conv);
2326                 return -1;
2327         }
2328         ret = SMB_VFS_NEXT_RMDIR(handle, conv_smb_fname);
2329         if (ret == -1) {
2330                 saved_errno = errno;
2331         }
2332         TALLOC_FREE(conv_smb_fname);
2333         TALLOC_FREE(conv);
2334         if (saved_errno != 0) {
2335                 errno = saved_errno;
2336         }
2337         return ret;
2338 }
2339
2340 static int shadow_copy2_chflags(vfs_handle_struct *handle,
2341                                 const struct smb_filename *smb_fname,
2342                                 unsigned int flags)
2343 {
2344         time_t timestamp = 0;
2345         char *stripped = NULL;
2346         int saved_errno = 0;
2347         int ret;
2348         char *conv;
2349         struct smb_filename *conv_smb_fname = NULL;
2350
2351         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2352                                         handle,
2353                                         smb_fname->base_name,
2354                                         &timestamp,
2355                                         &stripped)) {
2356                 return -1;
2357         }
2358         if (timestamp == 0) {
2359                 return SMB_VFS_NEXT_CHFLAGS(handle, smb_fname, flags);
2360         }
2361         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2362         TALLOC_FREE(stripped);
2363         if (conv == NULL) {
2364                 return -1;
2365         }
2366         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2367                                         conv,
2368                                         NULL,
2369                                         NULL,
2370                                         smb_fname->flags);
2371         if (conv_smb_fname == NULL) {
2372                 TALLOC_FREE(conv);
2373                 return -1;
2374         }
2375         ret = SMB_VFS_NEXT_CHFLAGS(handle, smb_fname, flags);
2376         if (ret == -1) {
2377                 saved_errno = errno;
2378         }
2379         TALLOC_FREE(conv_smb_fname);
2380         TALLOC_FREE(conv);
2381         if (saved_errno != 0) {
2382                 errno = saved_errno;
2383         }
2384         return ret;
2385 }
2386
2387 static ssize_t shadow_copy2_getxattr(vfs_handle_struct *handle,
2388                                 const struct smb_filename *smb_fname,
2389                                 const char *aname,
2390                                 void *value,
2391                                 size_t size)
2392 {
2393         time_t timestamp = 0;
2394         char *stripped = NULL;
2395         ssize_t ret;
2396         int saved_errno = 0;
2397         char *conv;
2398         struct smb_filename *conv_smb_fname = NULL;
2399
2400         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2401                                 handle,
2402                                 smb_fname->base_name,
2403                                 &timestamp,
2404                                 &stripped)) {
2405                 return -1;
2406         }
2407         if (timestamp == 0) {
2408                 return SMB_VFS_NEXT_GETXATTR(handle, smb_fname, aname, value,
2409                                              size);
2410         }
2411         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2412         TALLOC_FREE(stripped);
2413         if (conv == NULL) {
2414                 return -1;
2415         }
2416
2417         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2418                                         conv,
2419                                         NULL,
2420                                         NULL,
2421                                         smb_fname->flags);
2422         if (conv_smb_fname == NULL) {
2423                 TALLOC_FREE(conv);
2424                 return -1;
2425         }
2426
2427         ret = SMB_VFS_NEXT_GETXATTR(handle, conv_smb_fname, aname, value, size);
2428         if (ret == -1) {
2429                 saved_errno = errno;
2430         }
2431         TALLOC_FREE(conv_smb_fname);
2432         TALLOC_FREE(conv);
2433         if (saved_errno != 0) {
2434                 errno = saved_errno;
2435         }
2436         return ret;
2437 }
2438
2439 static ssize_t shadow_copy2_listxattr(struct vfs_handle_struct *handle,
2440                                       const struct smb_filename *smb_fname,
2441                                       char *list, size_t size)
2442 {
2443         time_t timestamp = 0;
2444         char *stripped = NULL;
2445         ssize_t ret;
2446         int saved_errno = 0;
2447         char *conv;
2448         struct smb_filename *conv_smb_fname = NULL;
2449
2450         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2451                                 handle,
2452                                 smb_fname->base_name,
2453                                 &timestamp,
2454                                 &stripped)) {
2455                 return -1;
2456         }
2457         if (timestamp == 0) {
2458                 return SMB_VFS_NEXT_LISTXATTR(handle, smb_fname, list, size);
2459         }
2460         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2461         TALLOC_FREE(stripped);
2462         if (conv == NULL) {
2463                 return -1;
2464         }
2465         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2466                                         conv,
2467                                         NULL,
2468                                         NULL,
2469                                         smb_fname->flags);
2470         if (conv_smb_fname == NULL) {
2471                 TALLOC_FREE(conv);
2472                 return -1;
2473         }
2474         ret = SMB_VFS_NEXT_LISTXATTR(handle, conv_smb_fname, list, size);
2475         if (ret == -1) {
2476                 saved_errno = errno;
2477         }
2478         TALLOC_FREE(conv_smb_fname);
2479         TALLOC_FREE(conv);
2480         if (saved_errno != 0) {
2481                 errno = saved_errno;
2482         }
2483         return ret;
2484 }
2485
2486 static int shadow_copy2_removexattr(vfs_handle_struct *handle,
2487                                 const struct smb_filename *smb_fname,
2488                                 const char *aname)
2489 {
2490         time_t timestamp = 0;
2491         char *stripped = NULL;
2492         int saved_errno = 0;
2493         int ret;
2494         char *conv;
2495         struct smb_filename *conv_smb_fname = NULL;
2496
2497         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2498                                 handle,
2499                                 smb_fname->base_name,
2500                                 &timestamp,
2501                                 &stripped)) {
2502                 return -1;
2503         }
2504         if (timestamp == 0) {
2505                 return SMB_VFS_NEXT_REMOVEXATTR(handle, smb_fname, aname);
2506         }
2507         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2508         TALLOC_FREE(stripped);
2509         if (conv == NULL) {
2510                 return -1;
2511         }
2512         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2513                                         conv,
2514                                         NULL,
2515                                         NULL,
2516                                         smb_fname->flags);
2517         if (conv_smb_fname == NULL) {
2518                 TALLOC_FREE(conv);
2519                 return -1;
2520         }
2521         ret = SMB_VFS_NEXT_REMOVEXATTR(handle, conv_smb_fname, aname);
2522         if (ret == -1) {
2523                 saved_errno = errno;
2524         }
2525         TALLOC_FREE(conv_smb_fname);
2526         TALLOC_FREE(conv);
2527         if (saved_errno != 0) {
2528                 errno = saved_errno;
2529         }
2530         return ret;
2531 }
2532
2533 static int shadow_copy2_setxattr(struct vfs_handle_struct *handle,
2534                                  const struct smb_filename *smb_fname,
2535                                  const char *aname, const void *value,
2536                                  size_t size, int flags)
2537 {
2538         time_t timestamp = 0;
2539         char *stripped = NULL;
2540         ssize_t ret;
2541         int saved_errno = 0;
2542         char *conv;
2543         struct smb_filename *conv_smb_fname = NULL;
2544
2545         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2546                                 handle,
2547                                 smb_fname->base_name,
2548                                 &timestamp,
2549                                 &stripped)) {
2550                 return -1;
2551         }
2552         if (timestamp == 0) {
2553                 return SMB_VFS_NEXT_SETXATTR(handle, smb_fname,
2554                                         aname, value, size, flags);
2555         }
2556         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2557         TALLOC_FREE(stripped);
2558         if (conv == NULL) {
2559                 return -1;
2560         }
2561         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2562                                         conv,
2563                                         NULL,
2564                                         NULL,
2565                                         smb_fname->flags);
2566         if (conv_smb_fname == NULL) {
2567                 TALLOC_FREE(conv);
2568                 return -1;
2569         }
2570         ret = SMB_VFS_NEXT_SETXATTR(handle, conv_smb_fname,
2571                                 aname, value, size, flags);
2572         if (ret == -1) {
2573                 saved_errno = errno;
2574         }
2575         TALLOC_FREE(conv_smb_fname);
2576         TALLOC_FREE(conv);
2577         if (saved_errno != 0) {
2578                 errno = saved_errno;
2579         }
2580         return ret;
2581 }
2582
2583 static int shadow_copy2_chmod_acl(vfs_handle_struct *handle,
2584                         const struct smb_filename *smb_fname,
2585                         mode_t mode)
2586 {
2587         time_t timestamp = 0;
2588         char *stripped = NULL;
2589         ssize_t ret;
2590         int saved_errno = 0;
2591         char *conv = NULL;
2592         struct smb_filename *conv_smb_fname = NULL;
2593
2594         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2595                                 handle,
2596                                 smb_fname->base_name,
2597                                 &timestamp,
2598                                 &stripped)) {
2599                 return -1;
2600         }
2601         if (timestamp == 0) {
2602                 return SMB_VFS_NEXT_CHMOD_ACL(handle, smb_fname, mode);
2603         }
2604         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2605         TALLOC_FREE(stripped);
2606         if (conv == NULL) {
2607                 return -1;
2608         }
2609         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2610                                         conv,
2611                                         NULL,
2612                                         NULL,
2613                                         smb_fname->flags);
2614         if (conv_smb_fname == NULL) {
2615                 TALLOC_FREE(conv);
2616                 errno = ENOMEM;
2617                 return -1;
2618         }
2619         ret = SMB_VFS_NEXT_CHMOD_ACL(handle, conv_smb_fname, mode);
2620         if (ret == -1) {
2621                 saved_errno = errno;
2622         }
2623         TALLOC_FREE(conv);
2624         TALLOC_FREE(conv_smb_fname);
2625         if (saved_errno != 0) {
2626                 errno = saved_errno;
2627         }
2628         return ret;
2629 }
2630
2631 static int shadow_copy2_get_real_filename(struct vfs_handle_struct *handle,
2632                                           const char *path,
2633                                           const char *name,
2634                                           TALLOC_CTX *mem_ctx,
2635                                           char **found_name)
2636 {
2637         time_t timestamp = 0;
2638         char *stripped = NULL;
2639         ssize_t ret;
2640         int saved_errno = 0;
2641         char *conv;
2642
2643         DEBUG(10, ("shadow_copy2_get_real_filename called for path=[%s], "
2644                    "name=[%s]\n", path, name));
2645
2646         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, path,
2647                                          &timestamp, &stripped)) {
2648                 DEBUG(10, ("shadow_copy2_strip_snapshot failed\n"));
2649                 return -1;
2650         }
2651         if (timestamp == 0) {
2652                 DEBUG(10, ("timestamp == 0\n"));
2653                 return SMB_VFS_NEXT_GET_REAL_FILENAME(handle, path, name,
2654                                                       mem_ctx, found_name);
2655         }
2656         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2657         TALLOC_FREE(stripped);
2658         if (conv == NULL) {
2659                 DEBUG(10, ("shadow_copy2_convert failed\n"));
2660                 return -1;
2661         }
2662         DEBUG(10, ("Calling NEXT_GET_REAL_FILE_NAME for conv=[%s], "
2663                    "name=[%s]\n", conv, name));
2664         ret = SMB_VFS_NEXT_GET_REAL_FILENAME(handle, conv, name,
2665                                              mem_ctx, found_name);
2666         DEBUG(10, ("NEXT_REAL_FILE_NAME returned %d\n", (int)ret));
2667         if (ret == -1) {
2668                 saved_errno = errno;
2669         }
2670         TALLOC_FREE(conv);
2671         if (saved_errno != 0) {
2672                 errno = saved_errno;
2673         }
2674         return ret;
2675 }
2676
2677 static const char *shadow_copy2_connectpath(struct vfs_handle_struct *handle,
2678                                             const char *fname)
2679 {
2680         time_t timestamp = 0;
2681         char *stripped = NULL;
2682         char *tmp = NULL;
2683         char *result = NULL;
2684         char *parent_dir = NULL;
2685         int saved_errno = 0;
2686         size_t rootpath_len = 0;
2687         struct shadow_copy2_private *priv = NULL;
2688
2689         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
2690                                 return NULL);
2691
2692         DBG_DEBUG("Calc connect path for [%s]\n", fname);
2693
2694         if (priv->shadow_connectpath != NULL) {
2695                 DBG_DEBUG("cached connect path is [%s]\n",
2696                         priv->shadow_connectpath);
2697                 return priv->shadow_connectpath;
2698         }
2699
2700         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
2701                                          &timestamp, &stripped)) {
2702                 goto done;
2703         }
2704         if (timestamp == 0) {
2705                 return SMB_VFS_NEXT_CONNECTPATH(handle, fname);
2706         }
2707
2708         tmp = shadow_copy2_do_convert(talloc_tos(), handle, stripped, timestamp,
2709                                       &rootpath_len);
2710         if (tmp == NULL) {
2711                 if (errno != ENOENT) {
2712                         goto done;
2713                 }
2714
2715                 /*
2716                  * If the converted path does not exist, and converting
2717                  * the parent yields something that does exist, then
2718                  * this path refers to something that has not been
2719                  * created yet, relative to the parent path.
2720                  * The snapshot finding is relative to the parent.
2721                  * (usually snapshots are read/only but this is not
2722                  * necessarily true).
2723                  * This code also covers getting a wildcard in the
2724                  * last component, because this function is called
2725                  * prior to sanitizing the path, and in SMB1 we may
2726                  * get wildcards in path names.
2727                  */
2728                 if (!parent_dirname(talloc_tos(), stripped, &parent_dir,
2729                                     NULL)) {
2730                         errno = ENOMEM;
2731                         goto done;
2732                 }
2733
2734                 tmp = shadow_copy2_do_convert(talloc_tos(), handle, parent_dir,
2735                                               timestamp, &rootpath_len);
2736                 if (tmp == NULL) {
2737                         goto done;
2738                 }
2739         }
2740
2741         DBG_DEBUG("converted path is [%s] root path is [%.*s]\n", tmp,
2742                   (int)rootpath_len, tmp);
2743
2744         tmp[rootpath_len] = '\0';
2745         result = SMB_VFS_NEXT_REALPATH(handle, tmp);
2746         if (result == NULL) {
2747                 goto done;
2748         }
2749
2750         /*
2751          * SMB_VFS_NEXT_REALPATH returns a malloc'ed string.
2752          * Don't leak memory.
2753          */
2754         SAFE_FREE(priv->shadow_realpath);
2755         priv->shadow_realpath = result;
2756
2757         DBG_DEBUG("connect path is [%s]\n", result);
2758
2759 done:
2760         if (result == NULL) {
2761                 saved_errno = errno;
2762         }
2763         TALLOC_FREE(tmp);
2764         TALLOC_FREE(stripped);
2765         TALLOC_FREE(parent_dir);
2766         if (saved_errno != 0) {
2767                 errno = saved_errno;
2768         }
2769         return result;
2770 }
2771
2772 static uint64_t shadow_copy2_disk_free(vfs_handle_struct *handle,
2773                                 const struct smb_filename *smb_fname,
2774                                 uint64_t *bsize,
2775                                 uint64_t *dfree,
2776                                 uint64_t *dsize)
2777 {
2778         time_t timestamp = 0;
2779         char *stripped = NULL;
2780         int saved_errno = 0;
2781         char *conv = NULL;
2782         struct smb_filename *conv_smb_fname = NULL;
2783         uint64_t ret = (uint64_t)-1;
2784
2785         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2786                                 handle,
2787                                 smb_fname->base_name,
2788                                 &timestamp,
2789                                 &stripped)) {
2790                 return (uint64_t)-1;
2791         }
2792         if (timestamp == 0) {
2793                 return SMB_VFS_NEXT_DISK_FREE(handle, smb_fname,
2794                                               bsize, dfree, dsize);
2795         }
2796         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2797         TALLOC_FREE(stripped);
2798         if (conv == NULL) {
2799                 return (uint64_t)-1;
2800         }
2801         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2802                                         conv,
2803                                         NULL,
2804                                         NULL,
2805                                         smb_fname->flags);
2806         if (conv_smb_fname == NULL) {
2807                 TALLOC_FREE(conv);
2808                 return (uint64_t)-1;
2809         }
2810         ret = SMB_VFS_NEXT_DISK_FREE(handle, conv_smb_fname,
2811                                 bsize, dfree, dsize);
2812         if (ret == (uint64_t)-1) {
2813                 saved_errno = errno;
2814         }
2815         TALLOC_FREE(conv);
2816         TALLOC_FREE(conv_smb_fname);
2817         if (saved_errno != 0) {
2818                 errno = saved_errno;
2819         }
2820         return ret;
2821 }
2822
2823 static int shadow_copy2_get_quota(vfs_handle_struct *handle,
2824                                 const struct smb_filename *smb_fname,
2825                                 enum SMB_QUOTA_TYPE qtype,
2826                                 unid_t id,
2827                                 SMB_DISK_QUOTA *dq)
2828 {
2829         time_t timestamp = 0;
2830         char *stripped = NULL;
2831         int ret;
2832         int saved_errno = 0;
2833         char *conv;
2834         struct smb_filename *conv_smb_fname = NULL;
2835
2836         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2837                                 handle,
2838                                 smb_fname->base_name,
2839                                 &timestamp,
2840                                 &stripped)) {
2841                 return -1;
2842         }
2843         if (timestamp == 0) {
2844                 return SMB_VFS_NEXT_GET_QUOTA(handle, smb_fname, qtype, id, dq);
2845         }
2846
2847         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2848         TALLOC_FREE(stripped);
2849         if (conv == NULL) {
2850                 return -1;
2851         }
2852         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2853                                         conv,
2854                                         NULL,
2855                                         NULL,
2856                                         smb_fname->flags);
2857         if (conv_smb_fname == NULL) {
2858                 TALLOC_FREE(conv);
2859                 return -1;
2860         }
2861         ret = SMB_VFS_NEXT_GET_QUOTA(handle, conv_smb_fname, qtype, id, dq);
2862
2863         if (ret == -1) {
2864                 saved_errno = errno;
2865         }
2866         TALLOC_FREE(conv);
2867         TALLOC_FREE(conv_smb_fname);
2868         if (saved_errno != 0) {
2869                 errno = saved_errno;
2870         }
2871
2872         return ret;
2873 }
2874
2875 static int shadow_copy2_private_destructor(struct shadow_copy2_private *priv)
2876 {
2877         SAFE_FREE(priv->shadow_realpath);
2878         return 0;
2879 }
2880
2881 static int shadow_copy2_connect(struct vfs_handle_struct *handle,
2882                                 const char *service, const char *user)
2883 {
2884         struct shadow_copy2_config *config;
2885         struct shadow_copy2_private *priv;
2886         int ret;
2887         const char *snapdir;
2888         const char *snapprefix = NULL;
2889         const char *delimiter;
2890         const char *gmt_format;
2891         const char *sort_order;
2892         const char *basedir = NULL;
2893         const char *snapsharepath = NULL;
2894         const char *mount_point;
2895
2896         DEBUG(10, (__location__ ": cnum[%u], connectpath[%s]\n",
2897                    (unsigned)handle->conn->cnum,
2898                    handle->conn->connectpath));
2899
2900         ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
2901         if (ret < 0) {
2902                 return ret;
2903         }
2904
2905         priv = talloc_zero(handle->conn, struct shadow_copy2_private);
2906         if (priv == NULL) {
2907                 DBG_ERR("talloc_zero() failed\n");
2908                 errno = ENOMEM;
2909                 return -1;
2910         }
2911
2912         talloc_set_destructor(priv, shadow_copy2_private_destructor);
2913
2914         priv->snaps = talloc_zero(priv, struct shadow_copy2_snaplist_info);
2915         if (priv->snaps == NULL) {
2916                 DBG_ERR("talloc_zero() failed\n");
2917                 errno = ENOMEM;
2918                 return -1;
2919         }
2920
2921         config = talloc_zero(priv, struct shadow_copy2_config);
2922         if (config == NULL) {
2923                 DEBUG(0, ("talloc_zero() failed\n"));
2924                 errno = ENOMEM;
2925                 return -1;
2926         }
2927
2928         priv->config = config;
2929
2930         gmt_format = lp_parm_const_string(SNUM(handle->conn),
2931                                           "shadow", "format",
2932                                           GMT_FORMAT);
2933         config->gmt_format = talloc_strdup(config, gmt_format);
2934         if (config->gmt_format == NULL) {
2935                 DEBUG(0, ("talloc_strdup() failed\n"));
2936                 errno = ENOMEM;
2937                 return -1;
2938         }
2939
2940         /* config->gmt_format must not contain a path separator. */
2941         if (strchr(config->gmt_format, '/') != NULL) {
2942                 DEBUG(0, ("shadow:format %s must not contain a /"
2943                         "character. Unable to initialize module.\n",
2944                         config->gmt_format));
2945                 errno = EINVAL;
2946                 return -1;
2947         }
2948
2949         config->use_sscanf = lp_parm_bool(SNUM(handle->conn),
2950                                           "shadow", "sscanf", false);
2951
2952         config->use_localtime = lp_parm_bool(SNUM(handle->conn),
2953                                              "shadow", "localtime",
2954                                              false);
2955
2956         snapdir = lp_parm_const_string(SNUM(handle->conn),
2957                                        "shadow", "snapdir",
2958                                        ".snapshots");
2959         config->snapdir = talloc_strdup(config, snapdir);
2960         if (config->snapdir == NULL) {
2961                 DEBUG(0, ("talloc_strdup() failed\n"));
2962                 errno = ENOMEM;
2963                 return -1;
2964         }
2965
2966         snapprefix = lp_parm_const_string(SNUM(handle->conn),
2967                                        "shadow", "snapprefix",
2968                                        NULL);
2969         if (snapprefix != NULL) {
2970                 priv->snaps->regex = talloc_zero(priv->snaps, regex_t);
2971                 if (priv->snaps->regex == NULL) {
2972                         DBG_ERR("talloc_zero() failed\n");
2973                         errno = ENOMEM;
2974                         return -1;
2975                 }
2976
2977                 /* pre-compute regex rule for matching pattern later */
2978                 ret = regcomp(priv->snaps->regex, snapprefix, 0);
2979                 if (ret) {
2980                         DBG_ERR("Failed to create regex object\n");
2981                         return -1;
2982                 }
2983         }
2984
2985         delimiter = lp_parm_const_string(SNUM(handle->conn),
2986                                        "shadow", "delimiter",
2987                                        "_GMT");
2988         if (delimiter != NULL) {
2989                 priv->config->delimiter = talloc_strdup(priv->config, delimiter);
2990                 if (priv->config->delimiter == NULL) {
2991                         DBG_ERR("talloc_strdup() failed\n");
2992                         errno = ENOMEM;
2993                         return -1;
2994                 }
2995         }
2996
2997         config->snapdirseverywhere = lp_parm_bool(SNUM(handle->conn),
2998                                                   "shadow",
2999                                                   "snapdirseverywhere",
3000                                                   false);
3001
3002         config->crossmountpoints = lp_parm_bool(SNUM(handle->conn),
3003                                                 "shadow", "crossmountpoints",
3004                                                 false);
3005
3006         if (config->crossmountpoints && !config->snapdirseverywhere) {
3007                 DBG_WARNING("Warning: 'crossmountpoints' depends on "
3008                             "'snapdirseverywhere'. Disabling crossmountpoints.\n");
3009         }
3010
3011         config->fixinodes = lp_parm_bool(SNUM(handle->conn),
3012                                          "shadow", "fixinodes",
3013                                          false);
3014
3015         sort_order = lp_parm_const_string(SNUM(handle->conn),
3016                                           "shadow", "sort", "desc");
3017         config->sort_order = talloc_strdup(config, sort_order);
3018         if (config->sort_order == NULL) {
3019                 DEBUG(0, ("talloc_strdup() failed\n"));
3020                 errno = ENOMEM;
3021                 return -1;
3022         }
3023
3024         mount_point = lp_parm_const_string(SNUM(handle->conn),
3025                                            "shadow", "mountpoint", NULL);
3026         if (mount_point != NULL) {
3027                 if (mount_point[0] != '/') {
3028                         DEBUG(1, (__location__ " Warning: 'mountpoint' is "
3029                                   "relative ('%s'), but it has to be an "
3030                                   "absolute path. Ignoring provided value.\n",
3031                                   mount_point));
3032                         mount_point = NULL;
3033                 } else {
3034                         char *p;
3035                         p = strstr(handle->conn->connectpath, mount_point);
3036                         if (p != handle->conn->connectpath) {
3037                                 DBG_WARNING("Warning: the share root (%s) is "
3038                                             "not a subdirectory of the "
3039                                             "specified mountpoint (%s). "
3040                                             "Ignoring provided value.\n",
3041                                             handle->conn->connectpath,
3042                                             mount_point);
3043                                 mount_point = NULL;
3044                         }
3045                 }
3046         }
3047
3048         if (mount_point != NULL) {
3049                 config->mount_point = talloc_strdup(config, mount_point);
3050                 if (config->mount_point == NULL) {
3051                         DEBUG(0, (__location__ " talloc_strdup() failed\n"));
3052                         return -1;
3053                 }
3054         } else {
3055                 config->mount_point = shadow_copy2_find_mount_point(config,
3056                                                                     handle);
3057                 if (config->mount_point == NULL) {
3058                         DBG_WARNING("shadow_copy2_find_mount_point "
3059                                     "of the share root '%s' failed: %s\n",
3060                                     handle->conn->connectpath, strerror(errno));
3061                         return -1;
3062                 }
3063         }
3064
3065         basedir = lp_parm_const_string(SNUM(handle->conn),
3066                                        "shadow", "basedir", NULL);
3067
3068         if (basedir != NULL) {
3069                 if (basedir[0] != '/') {
3070                         DEBUG(1, (__location__ " Warning: 'basedir' is "
3071                                   "relative ('%s'), but it has to be an "
3072                                   "absolute path. Disabling basedir.\n",
3073                                   basedir));
3074                         basedir = NULL;
3075                 } else {
3076                         char *p;
3077                         p = strstr(basedir, config->mount_point);
3078                         if (p != basedir) {
3079                                 DEBUG(1, ("Warning: basedir (%s) is not a "
3080                                           "subdirectory of the share root's "
3081                                           "mount point (%s). "
3082                                           "Disabling basedir\n",
3083                                           basedir, config->mount_point));
3084                                 basedir = NULL;
3085                         }
3086                 }
3087         }
3088
3089         if (config->snapdirseverywhere && basedir != NULL) {
3090                 DEBUG(1, (__location__ " Warning: 'basedir' is incompatible "
3091                           "with 'snapdirseverywhere'. Disabling basedir.\n"));
3092                 basedir = NULL;
3093         }
3094
3095         snapsharepath = lp_parm_const_string(SNUM(handle->conn), "shadow",
3096                                              "snapsharepath", NULL);
3097         if (snapsharepath != NULL) {
3098                 if (snapsharepath[0] == '/') {
3099                         DBG_WARNING("Warning: 'snapsharepath' is "
3100                                     "absolute ('%s'), but it has to be a "
3101                                     "relative path. Disabling snapsharepath.\n",
3102                                     snapsharepath);
3103                         snapsharepath = NULL;
3104                 }
3105                 if (config->snapdirseverywhere && snapsharepath != NULL) {
3106                         DBG_WARNING("Warning: 'snapsharepath' is incompatible "
3107                                     "with 'snapdirseverywhere'. Disabling "
3108                                     "snapsharepath.\n");
3109                         snapsharepath = NULL;
3110                 }
3111         }
3112
3113         if (basedir != NULL && snapsharepath != NULL) {
3114                 DBG_WARNING("Warning: 'snapsharepath' is incompatible with "
3115                             "'basedir'. Disabling snapsharepath\n");
3116                 snapsharepath = NULL;
3117         }
3118
3119         if (snapsharepath != NULL) {
3120                 config->rel_connectpath = talloc_strdup(config, snapsharepath);
3121                 if (config->rel_connectpath == NULL) {
3122                         DBG_ERR("talloc_strdup() failed\n");
3123                         errno = ENOMEM;
3124                         return -1;
3125                 }
3126         }
3127
3128         if (basedir == NULL) {
3129                 basedir = config->mount_point;
3130         }
3131
3132         if (config->rel_connectpath == NULL &&
3133             strlen(basedir) < strlen(handle->conn->connectpath)) {
3134                 config->rel_connectpath = talloc_strdup(config,
3135                         handle->conn->connectpath + strlen(basedir));
3136                 if (config->rel_connectpath == NULL) {
3137                         DEBUG(0, ("talloc_strdup() failed\n"));
3138                         errno = ENOMEM;
3139                         return -1;
3140                 }
3141         }
3142
3143         if (config->snapdir[0] == '/') {
3144                 config->snapdir_absolute = true;
3145
3146                 if (config->snapdirseverywhere == true) {
3147                         DEBUG(1, (__location__ " Warning: An absolute snapdir "
3148                                   "is incompatible with 'snapdirseverywhere', "
3149                                   "setting 'snapdirseverywhere' to false.\n"));
3150                         config->snapdirseverywhere = false;
3151                 }
3152
3153                 if (config->crossmountpoints == true) {
3154                         DEBUG(1, (__location__ " Warning: 'crossmountpoints' "
3155                                   "is not supported with an absolute snapdir. "
3156                                   "Disabling it.\n"));
3157                         config->crossmountpoints = false;
3158                 }
3159
3160                 config->snapshot_basepath = config->snapdir;
3161         } else {
3162                 config->snapshot_basepath = talloc_asprintf(config, "%s/%s",
3163                                 config->mount_point, config->snapdir);
3164                 if (config->snapshot_basepath == NULL) {
3165                         DEBUG(0, ("talloc_asprintf() failed\n"));
3166                         errno = ENOMEM;
3167                         return -1;
3168                 }
3169         }
3170
3171         trim_string(config->mount_point, NULL, "/");
3172         trim_string(config->rel_connectpath, "/", "/");
3173         trim_string(config->snapdir, NULL, "/");
3174         trim_string(config->snapshot_basepath, NULL, "/");
3175
3176         DEBUG(10, ("shadow_copy2_connect: configuration:\n"
3177                    "  share root: '%s'\n"
3178                    "  mountpoint: '%s'\n"
3179                    "  rel share root: '%s'\n"
3180                    "  snapdir: '%s'\n"
3181                    "  snapprefix: '%s'\n"
3182                    "  delimiter: '%s'\n"
3183                    "  snapshot base path: '%s'\n"
3184                    "  format: '%s'\n"
3185                    "  use sscanf: %s\n"
3186                    "  snapdirs everywhere: %s\n"
3187                    "  cross mountpoints: %s\n"
3188                    "  fix inodes: %s\n"
3189                    "  sort order: %s\n"
3190                    "",
3191                    handle->conn->connectpath,
3192                    config->mount_point,
3193                    config->rel_connectpath,
3194                    config->snapdir,
3195                    snapprefix,
3196                    config->delimiter,
3197                    config->snapshot_basepath,
3198                    config->gmt_format,
3199                    config->use_sscanf ? "yes" : "no",
3200                    config->snapdirseverywhere ? "yes" : "no",
3201                    config->crossmountpoints ? "yes" : "no",
3202                    config->fixinodes ? "yes" : "no",
3203                    config->sort_order
3204                    ));
3205
3206
3207         SMB_VFS_HANDLE_SET_DATA(handle, priv,
3208                                 NULL, struct shadow_copy2_private,
3209                                 return -1);
3210
3211         return 0;
3212 }
3213
3214 static struct vfs_fn_pointers vfs_shadow_copy2_fns = {
3215         .connect_fn = shadow_copy2_connect,
3216         .opendir_fn = shadow_copy2_opendir,
3217         .disk_free_fn = shadow_copy2_disk_free,
3218         .get_quota_fn = shadow_copy2_get_quota,
3219         .rename_fn = shadow_copy2_rename,
3220         .link_fn = shadow_copy2_link,
3221         .symlink_fn = shadow_copy2_symlink,
3222         .stat_fn = shadow_copy2_stat,
3223         .lstat_fn = shadow_copy2_lstat,
3224         .fstat_fn = shadow_copy2_fstat,
3225         .open_fn = shadow_copy2_open,
3226         .unlink_fn = shadow_copy2_unlink,
3227         .chmod_fn = shadow_copy2_chmod,
3228         .chown_fn = shadow_copy2_chown,
3229         .chdir_fn = shadow_copy2_chdir,
3230         .ntimes_fn = shadow_copy2_ntimes,
3231         .readlink_fn = shadow_copy2_readlink,
3232         .mknod_fn = shadow_copy2_mknod,
3233         .realpath_fn = shadow_copy2_realpath,
3234         .get_nt_acl_fn = shadow_copy2_get_nt_acl,
3235         .fget_nt_acl_fn = shadow_copy2_fget_nt_acl,
3236         .get_shadow_copy_data_fn = shadow_copy2_get_shadow_copy_data,
3237         .mkdir_fn = shadow_copy2_mkdir,
3238         .rmdir_fn = shadow_copy2_rmdir,
3239         .getxattr_fn = shadow_copy2_getxattr,
3240         .listxattr_fn = shadow_copy2_listxattr,
3241         .removexattr_fn = shadow_copy2_removexattr,
3242         .setxattr_fn = shadow_copy2_setxattr,
3243         .chmod_acl_fn = shadow_copy2_chmod_acl,
3244         .chflags_fn = shadow_copy2_chflags,
3245         .get_real_filename_fn = shadow_copy2_get_real_filename,
3246         .connectpath_fn = shadow_copy2_connectpath,
3247 };
3248
3249 NTSTATUS vfs_shadow_copy2_init(TALLOC_CTX *);
3250 NTSTATUS vfs_shadow_copy2_init(TALLOC_CTX *ctx)
3251 {
3252         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION,
3253                                 "shadow_copy2", &vfs_shadow_copy2_fns);
3254 }