source3/modules/vfs_shadow_copy2.c

   1 /*
   2  * shadow_copy2: a shadow copy module (second implementation)
   3  *
   4  * Copyright (C) Andrew Tridgell   2007 (portions taken from shadow_copy2)
   5  * Copyright (C) Ed Plese          2009
   6  * Copyright (C) Volker Lendecke   2011
   7  * Copyright (C) Christian Ambach  2011
   8  * Copyright (C) Michael Adam      2013
   9  * Copyright (C) Rajesh Joseph     2016
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24  */
  25
  26 /*
  27  * This is a second implemetation of a shadow copy module for exposing
  28  * file system snapshots to windows clients as shadow copies.
  29  *
  30  * See the manual page for documentation.
  31  */
  32
  33 #include "includes.h"
  34 #include "smbd/smbd.h"
  35 #include "system/filesys.h"
  36 #include "include/ntioctl.h"
  37 #include "util_tdb.h"
  38 #include "lib/util_path.h"
  39 #include "libcli/security/security.h"
  40 #include "lib/util/tevent_unix.h"
  41
  42 struct shadow_copy2_config {
  43         char *gmt_format;
  44         bool use_sscanf;
  45         bool use_localtime;
  46         char *snapdir;
  47         char *delimiter;
  48         bool snapdirseverywhere;
  49         bool crossmountpoints;
  50         bool fixinodes;
  51         char *sort_order;
  52         bool snapdir_absolute;
  53         char *mount_point;
  54         char *rel_connectpath; /* share root, relative to a snapshot root */
  55         char *snapshot_basepath; /* the absolute version of snapdir */
  56 };
  57
  58 /* Data-structure to hold the list of snap entries */
  59 struct shadow_copy2_snapentry {
  60         char *snapname;
  61         char *time_fmt;
  62         struct shadow_copy2_snapentry *next;
  63         struct shadow_copy2_snapentry *prev;
  64 };
  65
  66 struct shadow_copy2_snaplist_info {
  67         struct shadow_copy2_snapentry *snaplist; /* snapshot list */
  68         regex_t *regex; /* Regex to filter snaps */
  69         time_t fetch_time; /* snaplist update time */
  70 };
  71
  72
  73 /*
  74  * shadow_copy2 private structure. This structure will be
  75  * used to keep module specific information
  76  */
  77 struct shadow_copy2_private {
  78         struct shadow_copy2_config *config;
  79         struct shadow_copy2_snaplist_info *snaps;
  80         char *shadow_cwd; /* Absolute $cwd path. */
  81         /* Absolute connectpath - can vary depending on $cwd. */
  82         char *shadow_connectpath;
  83         /* talloc'ed realpath return. */
  84         struct smb_filename *shadow_realpath;
  85 };
  86
  87 static int shadow_copy2_get_shadow_copy_data(
  88         vfs_handle_struct *handle, files_struct *fsp,
  89         struct shadow_copy_data *shadow_copy2_data,
  90         bool labels);
  91
  92 /**
  93  *This function will create a new snapshot list entry and
  94  * return to the caller. This entry will also be added to
  95  * the global snapshot list.
  96  *
  97  * @param[in]   priv    shadow_copy2 specific data structure
  98  * @return      Newly   created snapshot entry or NULL on failure
  99  */
 100 static struct shadow_copy2_snapentry *shadow_copy2_create_snapentry(
 101                                         struct shadow_copy2_private *priv)
 102 {
 103         struct shadow_copy2_snapentry *tmpentry = NULL;
 104
 105         tmpentry = talloc_zero(priv->snaps, struct shadow_copy2_snapentry);
 106         if (tmpentry == NULL) {
 107                 DBG_ERR("talloc_zero() failed\n");
 108                 errno = ENOMEM;
 109                 return NULL;
 110         }
 111
 112         DLIST_ADD(priv->snaps->snaplist, tmpentry);
 113
 114         return tmpentry;
 115 }
 116
 117 /**
 118  *This function will delete the entire snaplist and reset
 119  * priv->snaps->snaplist to NULL.
 120  *
 121  * @param[in] priv shadow_copye specific data structure
 122  */
 123 static void shadow_copy2_delete_snaplist(struct shadow_copy2_private *priv)
 124 {
 125         struct shadow_copy2_snapentry *tmp = NULL;
 126
 127         while ((tmp = priv->snaps->snaplist) != NULL) {
 128                 DLIST_REMOVE(priv->snaps->snaplist, tmp);
 129                 talloc_free(tmp);
 130         }
 131 }
 132
 133 /**
 134  * Given a timestamp this function searches the global snapshot list
 135  * and returns the complete snapshot directory name saved in the entry.
 136  *
 137  * @param[in]   priv            shadow_copy2 specific structure
 138  * @param[in]   timestamp       timestamp corresponding to one of the snapshot
 139  * @param[out]  snap_str        buffer to copy the actual snapshot name
 140  * @param[in]   len             length of snap_str buffer
 141  *
 142  * @return      Length of actual snapshot name, and -1 on failure
 143  */
 144 static ssize_t shadow_copy2_saved_snapname(struct shadow_copy2_private *priv,
 145                                           struct tm *timestamp,
 146                                           char *snap_str, size_t len)
 147 {
 148         ssize_t snaptime_len = -1;
 149         struct shadow_copy2_snapentry *entry = NULL;
 150
 151         snaptime_len = strftime(snap_str, len, GMT_FORMAT, timestamp);
 152         if (snaptime_len == 0) {
 153                 DBG_ERR("strftime failed\n");
 154                 return -1;
 155         }
 156
 157         snaptime_len = -1;
 158
 159         for (entry = priv->snaps->snaplist; entry; entry = entry->next) {
 160                 if (strcmp(entry->time_fmt, snap_str) == 0) {
 161                         snaptime_len = snprintf(snap_str, len, "%s",
 162                                                 entry->snapname);
 163                         return snaptime_len;
 164                 }
 165         }
 166
 167         snap_str[0] = 0;
 168         return snaptime_len;
 169 }
 170
 171
 172 /**
 173  * This function will check if snaplist is updated or not. If snaplist
 174  * is empty then it will create a new list. Each time snaplist is updated
 175  * the time is recorded. If the snapshot time is greater than the snaplist
 176  * update time then chances are we are working on an older list. Then discard
 177  * the old list and fetch a new snaplist.
 178  *
 179  * @param[in]   handle          VFS handle struct
 180  * @param[in]   snap_time       time of snapshot
 181  *
 182  * @return      true if the list is updated else false
 183  */
 184 static bool shadow_copy2_update_snaplist(struct vfs_handle_struct *handle,
 185                 time_t snap_time)
 186 {
 187         int ret = -1;
 188         bool snaplist_updated = false;
 189         struct files_struct fsp = {0};
 190         struct smb_filename smb_fname = {0};
 191         double seconds = 0.0;
 192         struct shadow_copy2_private *priv = NULL;
 193
 194         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
 195                                 return false);
 196
 197         seconds = difftime(snap_time, priv->snaps->fetch_time);
 198
 199         /*
 200          * Fetch the snapshot list if either the snaplist is empty or the
 201          * required snapshot time is greater than the last fetched snaplist
 202          * time.
 203          */
 204         if (seconds > 0 || (priv->snaps->snaplist == NULL)) {
 205                 smb_fname.base_name = discard_const_p(char, ".");
 206                 fsp.fsp_name = &smb_fname;
 207
 208                 ret = shadow_copy2_get_shadow_copy_data(handle, &fsp,
 209                                                         NULL, false);
 210                 if (ret == 0) {
 211                         snaplist_updated = true;
 212                 } else {
 213                         DBG_ERR("Failed to get shadow copy data\n");
 214                 }
 215
 216         }
 217
 218         return snaplist_updated;
 219 }
 220
 221 static bool shadow_copy2_find_slashes(TALLOC_CTX *mem_ctx, const char *str,
 222                                       size_t **poffsets,
 223                                       unsigned *pnum_offsets)
 224 {
 225         unsigned num_offsets;
 226         size_t *offsets;
 227         const char *p;
 228
 229         num_offsets = 0;
 230
 231         p = str;
 232         while ((p = strchr(p, '/')) != NULL) {
 233                 num_offsets += 1;
 234                 p += 1;
 235         }
 236
 237         offsets = talloc_array(mem_ctx, size_t, num_offsets);
 238         if (offsets == NULL) {
 239                 return false;
 240         }
 241
 242         p = str;
 243         num_offsets = 0;
 244         while ((p = strchr(p, '/')) != NULL) {
 245                 offsets[num_offsets] = p-str;
 246                 num_offsets += 1;
 247                 p += 1;
 248         }
 249
 250         *poffsets = offsets;
 251         *pnum_offsets = num_offsets;
 252         return true;
 253 }
 254
 255 /**
 256  * Given a timestamp, build the posix level GMT-tag string
 257  * based on the configurable format.
 258  */
 259 static ssize_t shadow_copy2_posix_gmt_string(struct vfs_handle_struct *handle,
 260                                             time_t snapshot,
 261                                             char *snaptime_string,
 262                                             size_t len)
 263 {
 264         struct tm snap_tm;
 265         ssize_t snaptime_len;
 266         struct shadow_copy2_config *config;
 267         struct shadow_copy2_private *priv;
 268
 269         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
 270                                 return 0);
 271
 272         config = priv->config;
 273
 274         if (config->use_sscanf) {
 275                 snaptime_len = snprintf(snaptime_string,
 276                                         len,
 277                                         config->gmt_format,
 278                                         (unsigned long)snapshot);
 279                 if (snaptime_len <= 0) {
 280                         DEBUG(10, ("snprintf failed\n"));
 281                         return -1;
 282                 }
 283         } else {
 284                 if (config->use_localtime) {
 285                         if (localtime_r(&snapshot, &snap_tm) == 0) {
 286                                 DEBUG(10, ("gmtime_r failed\n"));
 287                                 return -1;
 288                         }
 289                 } else {
 290                         if (gmtime_r(&snapshot, &snap_tm) == 0) {
 291                                 DEBUG(10, ("gmtime_r failed\n"));
 292                                 return -1;
 293                         }
 294                 }
 295
 296                 if (priv->snaps->regex != NULL) {
 297                         snaptime_len = shadow_copy2_saved_snapname(priv,
 298                                                 &snap_tm, snaptime_string, len);
 299                         if (snaptime_len >= 0)
 300                                 return snaptime_len;
 301
 302                         /*
 303                          * If we fail to find the snapshot name, chances are
 304                          * that we have not updated our snaplist. Make sure the
 305                          * snaplist is updated.
 306                          */
 307                         if (!shadow_copy2_update_snaplist(handle, snapshot)) {
 308                                 DBG_DEBUG("shadow_copy2_update_snaplist "
 309                                           "failed\n");
 310                                 return -1;
 311                         }
 312
 313                         return shadow_copy2_saved_snapname(priv,
 314                                                 &snap_tm, snaptime_string, len);
 315                 }
 316
 317                 snaptime_len = strftime(snaptime_string,
 318                                         len,
 319                                         config->gmt_format,
 320                                         &snap_tm);
 321                 if (snaptime_len == 0) {
 322                         DEBUG(10, ("strftime failed\n"));
 323                         return -1;
 324                 }
 325         }
 326
 327         return snaptime_len;
 328 }
 329
 330 /**
 331  * Given a timestamp, build the string to insert into a path
 332  * as a path component for creating the local path to the
 333  * snapshot at the given timestamp of the input path.
 334  *
 335  * In the case of a parallel snapdir (specified with an
 336  * absolute path), this is the initial portion of the
 337  * local path of any snapshot file. The complete path is
 338  * obtained by appending the portion of the file's path
 339  * below the share root's mountpoint.
 340  */
 341 static char *shadow_copy2_insert_string(TALLOC_CTX *mem_ctx,
 342                                         struct vfs_handle_struct *handle,
 343                                         time_t snapshot)
 344 {
 345         fstring snaptime_string;
 346         ssize_t snaptime_len = 0;
 347         char *result = NULL;
 348         struct shadow_copy2_config *config;
 349         struct shadow_copy2_private *priv;
 350
 351         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
 352                                 return NULL);
 353
 354         config = priv->config;
 355
 356         snaptime_len = shadow_copy2_posix_gmt_string(handle,
 357                                                      snapshot,
 358                                                      snaptime_string,
 359                                                      sizeof(snaptime_string));
 360         if (snaptime_len <= 0) {
 361                 return NULL;
 362         }
 363
 364         if (config->snapdir_absolute) {
 365                 result = talloc_asprintf(mem_ctx, "%s/%s",
 366                                          config->snapdir, snaptime_string);
 367         } else {
 368                 result = talloc_asprintf(mem_ctx, "/%s/%s",
 369                                          config->snapdir, snaptime_string);
 370         }
 371         if (result == NULL) {
 372                 DEBUG(1, (__location__ " talloc_asprintf failed\n"));
 373         }
 374
 375         return result;
 376 }
 377
 378 /**
 379  * Build the posix snapshot path for the connection
 380  * at the given timestamp, i.e. the absolute posix path
 381  * that contains the snapshot for this file system.
 382  *
 383  * This only applies to classical case, i.e. not
 384  * to the "snapdirseverywhere" mode.
 385  */
 386 static char *shadow_copy2_snapshot_path(TALLOC_CTX *mem_ctx,
 387                                         struct vfs_handle_struct *handle,
 388                                         time_t snapshot)
 389 {
 390         fstring snaptime_string;
 391         ssize_t snaptime_len = 0;
 392         char *result = NULL;
 393         struct shadow_copy2_private *priv;
 394
 395         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
 396                                 return NULL);
 397
 398         snaptime_len = shadow_copy2_posix_gmt_string(handle,
 399                                                      snapshot,
 400                                                      snaptime_string,
 401                                                      sizeof(snaptime_string));
 402         if (snaptime_len <= 0) {
 403                 return NULL;
 404         }
 405
 406         result = talloc_asprintf(mem_ctx, "%s/%s",
 407                                  priv->config->snapshot_basepath, snaptime_string);
 408         if (result == NULL) {
 409                 DEBUG(1, (__location__ " talloc_asprintf failed\n"));
 410         }
 411
 412         return result;
 413 }
 414
 415 static char *make_path_absolute(TALLOC_CTX *mem_ctx,
 416                                 struct shadow_copy2_private *priv,
 417                                 const char *name)
 418 {
 419         char *newpath = NULL;
 420         char *abs_path = NULL;
 421
 422         if (name[0] != '/') {
 423                 newpath = talloc_asprintf(mem_ctx,
 424                                         "%s/%s",
 425                                         priv->shadow_cwd,
 426                                         name);
 427                 if (newpath == NULL) {
 428                         return NULL;
 429                 }
 430                 name = newpath;
 431         }
 432         abs_path = canonicalize_absolute_path(mem_ctx, name);
 433         TALLOC_FREE(newpath);
 434         return abs_path;
 435 }
 436
 437 /* Return a $cwd-relative path. */
 438 static bool make_relative_path(const char *cwd, char *abs_path)
 439 {
 440         size_t cwd_len = strlen(cwd);
 441         size_t abs_len = strlen(abs_path);
 442
 443         if (abs_len < cwd_len) {
 444                 return false;
 445         }
 446         if (memcmp(abs_path, cwd, cwd_len) != 0) {
 447                 return false;
 448         }
 449         /* The cwd_len != 1 case is for $cwd == '/' */
 450         if (cwd_len != 1 &&
 451             abs_path[cwd_len] != '/' &&
 452             abs_path[cwd_len] != '\0')
 453         {
 454                 return false;
 455         }
 456         if (abs_path[cwd_len] == '/') {
 457                 cwd_len++;
 458         }
 459         memmove(abs_path, &abs_path[cwd_len], abs_len + 1 - cwd_len);
 460         return true;
 461 }
 462
 463 static bool shadow_copy2_snapshot_to_gmt(vfs_handle_struct *handle,
 464                                         const char *name,
 465                                         char *gmt, size_t gmt_len);
 466
 467 /*
 468  * Check if an incoming filename is already a snapshot converted pathname.
 469  *
 470  * If so, it returns the pathname truncated at the snapshot point which
 471  * will be used as the connectpath.
 472  */
 473
 474 static int check_for_converted_path(TALLOC_CTX *mem_ctx,
 475                                 struct vfs_handle_struct *handle,
 476                                 struct shadow_copy2_private *priv,
 477                                 char *abs_path,
 478                                 bool *ppath_already_converted,
 479                                 char **pconnectpath)
 480 {
 481         size_t snapdirlen = 0;
 482         char *p = strstr_m(abs_path, priv->config->snapdir);
 483         char *q = NULL;
 484         char *connect_path = NULL;
 485         char snapshot[GMT_NAME_LEN+1];
 486
 487         *ppath_already_converted = false;
 488
 489         if (p == NULL) {
 490                 /* Must at least contain shadow:snapdir. */
 491                 return 0;
 492         }
 493
 494         if (priv->config->snapdir[0] == '/' &&
 495                         p != abs_path) {
 496                 /* Absolute shadow:snapdir must be at the start. */
 497                 return 0;
 498         }
 499
 500         snapdirlen = strlen(priv->config->snapdir);
 501         if (p[snapdirlen] != '/') {
 502                 /* shadow:snapdir must end as a separate component. */
 503                 return 0;
 504         }
 505
 506         if (p > abs_path && p[-1] != '/') {
 507                 /* shadow:snapdir must start as a separate component. */
 508                 return 0;
 509         }
 510
 511         p += snapdirlen;
 512         p++; /* Move past the / */
 513
 514         /*
 515          * Need to return up to the next path
 516          * component after the time.
 517          * This will be used as the connectpath.
 518          */
 519         q = strchr(p, '/');
 520         if (q == NULL) {
 521                 /*
 522                  * No next path component.
 523                  * Use entire string.
 524                  */
 525                 connect_path = talloc_strdup(mem_ctx,
 526                                         abs_path);
 527         } else {
 528                 connect_path = talloc_strndup(mem_ctx,
 529                                         abs_path,
 530                                         q - abs_path);
 531         }
 532         if (connect_path == NULL) {
 533                 return ENOMEM;
 534         }
 535
 536         /*
 537          * Point p at the same offset in connect_path as
 538          * it is in abs_path.
 539          */
 540
 541         p = &connect_path[p - abs_path];
 542
 543         /*
 544          * Now ensure there is a time string at p.
 545          * The SMB-format @GMT-token string is returned
 546          * in snapshot.
 547          */
 548
 549         if (!shadow_copy2_snapshot_to_gmt(handle,
 550                                 p,
 551                                 snapshot,
 552                                 sizeof(snapshot))) {
 553                 TALLOC_FREE(connect_path);
 554                 return 0;
 555         }
 556
 557         if (pconnectpath != NULL) {
 558                 *pconnectpath = connect_path;
 559         }
 560
 561         *ppath_already_converted = true;
 562
 563         DBG_DEBUG("path |%s| is already converted. "
 564                 "connect path = |%s|\n",
 565                 abs_path,
 566                 connect_path);
 567
 568         return 0;
 569 }
 570
 571 /**
 572  * This function does two things.
 573  *
 574  * 1). Checks if an incoming filename is already a
 575  * snapshot converted pathname.
 576  *     If so, it returns the pathname truncated
 577  *     at the snapshot point which will be used
 578  *     as the connectpath, and then does an early return.
 579  *
 580  * 2). Checks if an incoming filename contains an
 581  * SMB-layer @GMT- style timestamp.
 582  *     If so, it strips the timestamp, and returns
 583  *     both the timestamp and the stripped path
 584  *     (making it cwd-relative).
 585  */
 586
 587 static bool shadow_copy2_strip_snapshot_internal(TALLOC_CTX *mem_ctx,
 588                                         struct vfs_handle_struct *handle,
 589                                         const char *orig_name,
 590                                         time_t *ptimestamp,
 591                                         char **pstripped,
 592                                         char **psnappath,
 593                                         bool *_already_converted)
 594 {
 595         struct tm tm;
 596         time_t timestamp = 0;
 597         const char *p;
 598         char *q;
 599         char *stripped = NULL;
 600         size_t rest_len, dst_len;
 601         struct shadow_copy2_private *priv;
 602         ptrdiff_t len_before_gmt;
 603         const char *name = orig_name;
 604         char *abs_path = NULL;
 605         bool ret = true;
 606         bool already_converted = false;
 607         int err = 0;
 608
 609         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
 610                                 return false);
 611
 612         DEBUG(10, (__location__ ": enter path '%s'\n", name));
 613
 614         if (_already_converted != NULL) {
 615                 *_already_converted = false;
 616         }
 617
 618         abs_path = make_path_absolute(mem_ctx, priv, name);
 619         if (abs_path == NULL) {
 620                 ret = false;
 621                 goto out;
 622         }
 623         name = abs_path;
 624
 625         DEBUG(10, (__location__ ": abs path '%s'\n", name));
 626
 627         err = check_for_converted_path(mem_ctx,
 628                                         handle,
 629                                         priv,
 630                                         abs_path,
 631                                         &already_converted,
 632                                         psnappath);
 633         if (err != 0) {
 634                 /* error in conversion. */
 635                 ret = false;
 636                 goto out;
 637         }
 638
 639         if (already_converted) {
 640                 if (_already_converted != NULL) {
 641                         *_already_converted = true;
 642                 }
 643                 goto out;
 644         }
 645
 646         /*
 647          * From here we're only looking to strip an
 648          * SMB-layer @GMT- token.
 649          */
 650
 651         p = strstr_m(name, "@GMT-");
 652         if (p == NULL) {
 653                 DEBUG(11, ("@GMT not found\n"));
 654                 goto out;
 655         }
 656         if ((p > name) && (p[-1] != '/')) {
 657                 /* the GMT-token does not start a path-component */
 658                 DEBUG(10, ("not at start, p=%p, name=%p, p[-1]=%d\n",
 659                            p, name, (int)p[-1]));
 660                 goto out;
 661         }
 662
 663         len_before_gmt = p - name;
 664
 665         q = strptime(p, GMT_FORMAT, &tm);
 666         if (q == NULL) {
 667                 DEBUG(10, ("strptime failed\n"));
 668                 goto out;
 669         }
 670         tm.tm_isdst = -1;
 671         timestamp = timegm(&tm);
 672         if (timestamp == (time_t)-1) {
 673                 DEBUG(10, ("timestamp==-1\n"));
 674                 goto out;
 675         }
 676         if (q[0] == '\0') {
 677                 /*
 678                  * The name consists of only the GMT token or the GMT
 679                  * token is at the end of the path. XP seems to send
 680                  * @GMT- at the end under certain circumstances even
 681                  * with a path prefix.
 682                  */
 683                 if (pstripped != NULL) {
 684                         if (len_before_gmt > 1) {
 685                                 /*
 686                                  * There is a path (and not only a slash)
 687                                  * before the @GMT-. Remove the trailing
 688                                  * slash character.
 689                                  */
 690                                 len_before_gmt -= 1;
 691                         }
 692                         stripped = talloc_strndup(mem_ctx, name,
 693                                         len_before_gmt);
 694                         if (stripped == NULL) {
 695                                 ret = false;
 696                                 goto out;
 697                         }
 698                         if (orig_name[0] != '/') {
 699                                 if (make_relative_path(priv->shadow_cwd,
 700                                                 stripped) == false) {
 701                                         DEBUG(10, (__location__ ": path '%s' "
 702                                                 "doesn't start with cwd '%s'\n",
 703                                                 stripped, priv->shadow_cwd));
 704                                                 ret = false;
 705                                         errno = ENOENT;
 706                                         goto out;
 707                                 }
 708                         }
 709                         *pstripped = stripped;
 710                 }
 711                 *ptimestamp = timestamp;
 712                 goto out;
 713         }
 714         if (q[0] != '/') {
 715                 /*
 716                  * It is not a complete path component, i.e. the path
 717                  * component continues after the gmt-token.
 718                  */
 719                 DEBUG(10, ("q[0] = %d\n", (int)q[0]));
 720                 goto out;
 721         }
 722         q += 1;
 723
 724         rest_len = strlen(q);
 725         dst_len = len_before_gmt + rest_len;
 726
 727         if (pstripped != NULL) {
 728                 stripped = talloc_array(mem_ctx, char, dst_len+1);
 729                 if (stripped == NULL) {
 730                         ret = false;
 731                         goto out;
 732                 }
 733                 if (p > name) {
 734                         memcpy(stripped, name, len_before_gmt);
 735                 }
 736                 if (rest_len > 0) {
 737                         memcpy(stripped + len_before_gmt, q, rest_len);
 738                 }
 739                 stripped[dst_len] = '\0';
 740                 if (orig_name[0] != '/') {
 741                         if (make_relative_path(priv->shadow_cwd,
 742                                         stripped) == false) {
 743                                 DEBUG(10, (__location__ ": path '%s' "
 744                                         "doesn't start with cwd '%s'\n",
 745                                         stripped, priv->shadow_cwd));
 746                                 ret = false;
 747                                 errno = ENOENT;
 748                                 goto out;
 749                         }
 750                 }
 751                 *pstripped = stripped;
 752         }
 753         *ptimestamp = timestamp;
 754         ret = true;
 755
 756   out:
 757         TALLOC_FREE(abs_path);
 758         return ret;
 759 }
 760
 761 static bool shadow_copy2_strip_snapshot(TALLOC_CTX *mem_ctx,
 762                                         struct vfs_handle_struct *handle,
 763                                         const char *orig_name,
 764                                         time_t *ptimestamp,
 765                                         char **pstripped)
 766 {
 767         return shadow_copy2_strip_snapshot_internal(mem_ctx,
 768                                         handle,
 769                                         orig_name,
 770                                         ptimestamp,
 771                                         pstripped,
 772                                         NULL,
 773                                         NULL);
 774 }
 775
 776 static bool shadow_copy2_strip_snapshot_converted(TALLOC_CTX *mem_ctx,
 777                                         struct vfs_handle_struct *handle,
 778                                         const char *orig_name,
 779                                         time_t *ptimestamp,
 780                                         char **pstripped,
 781                                         bool *is_converted)
 782 {
 783         return shadow_copy2_strip_snapshot_internal(mem_ctx,
 784                                         handle,
 785                                         orig_name,
 786                                         ptimestamp,
 787                                         pstripped,
 788                                         NULL,
 789                                         is_converted);
 790 }
 791
 792 static char *shadow_copy2_find_mount_point(TALLOC_CTX *mem_ctx,
 793                                            vfs_handle_struct *handle)
 794 {
 795         char *path = talloc_strdup(mem_ctx, handle->conn->connectpath);
 796         dev_t dev;
 797         struct stat st;
 798         char *p;
 799
 800         if (stat(path, &st) != 0) {
 801                 talloc_free(path);
 802                 return NULL;
 803         }
 804
 805         dev = st.st_dev;
 806
 807         while ((p = strrchr(path, '/')) && p > path) {
 808                 *p = 0;
 809                 if (stat(path, &st) != 0) {
 810                         talloc_free(path);
 811                         return NULL;
 812                 }
 813                 if (st.st_dev != dev) {
 814                         *p = '/';
 815                         break;
 816                 }
 817         }
 818
 819         return path;
 820 }
 821
 822 /**
 823  * Convert from a name as handed in via the SMB layer
 824  * and a timestamp into the local path of the snapshot
 825  * of the provided file at the provided time.
 826  * Also return the path in the snapshot corresponding
 827  * to the file's share root.
 828  */
 829 static char *shadow_copy2_do_convert(TALLOC_CTX *mem_ctx,
 830                                      struct vfs_handle_struct *handle,
 831                                      const char *name, time_t timestamp,
 832                                      size_t *snaproot_len)
 833 {
 834         struct smb_filename converted_fname;
 835         char *result = NULL;
 836         size_t *slashes = NULL;
 837         unsigned num_slashes;
 838         char *path = NULL;
 839         size_t pathlen;
 840         char *insert = NULL;
 841         char *converted = NULL;
 842         size_t insertlen, connectlen = 0;
 843         int saved_errno = 0;
 844         int i;
 845         size_t min_offset;
 846         struct shadow_copy2_config *config;
 847         struct shadow_copy2_private *priv;
 848         size_t in_share_offset = 0;
 849
 850         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
 851                                 return NULL);
 852
 853         config = priv->config;
 854
 855         DEBUG(10, ("converting '%s'\n", name));
 856
 857         if (!config->snapdirseverywhere) {
 858                 int ret;
 859                 char *snapshot_path;
 860
 861                 snapshot_path = shadow_copy2_snapshot_path(talloc_tos(),
 862                                                            handle,
 863                                                            timestamp);
 864                 if (snapshot_path == NULL) {
 865                         goto fail;
 866                 }
 867
 868                 if (config->rel_connectpath == NULL) {
 869                         converted = talloc_asprintf(mem_ctx, "%s/%s",
 870                                                     snapshot_path, name);
 871                 } else {
 872                         converted = talloc_asprintf(mem_ctx, "%s/%s/%s",
 873                                                     snapshot_path,
 874                                                     config->rel_connectpath,
 875                                                     name);
 876                 }
 877                 if (converted == NULL) {
 878                         goto fail;
 879                 }
 880
 881                 ZERO_STRUCT(converted_fname);
 882                 converted_fname.base_name = converted;
 883
 884                 ret = SMB_VFS_NEXT_LSTAT(handle, &converted_fname);
 885                 DEBUG(10, ("Trying[not snapdirseverywhere] %s: %d (%s)\n",
 886                            converted,
 887                            ret, ret == 0 ? "ok" : strerror(errno)));
 888                 if (ret == 0) {
 889                         DEBUG(10, ("Found %s\n", converted));
 890                         result = converted;
 891                         converted = NULL;
 892                         if (snaproot_len != NULL) {
 893                                 *snaproot_len = strlen(snapshot_path);
 894                                 if (config->rel_connectpath != NULL) {
 895                                         *snaproot_len +=
 896                                             strlen(config->rel_connectpath) + 1;
 897                                 }
 898                         }
 899                         goto fail;
 900                 } else {
 901                         errno = ENOENT;
 902                         goto fail;
 903                 }
 904                 /* never reached ... */
 905         }
 906
 907         connectlen = strlen(handle->conn->connectpath);
 908         if (name[0] == 0) {
 909                 path = talloc_strdup(mem_ctx, handle->conn->connectpath);
 910         } else {
 911                 path = talloc_asprintf(
 912                         mem_ctx, "%s/%s", handle->conn->connectpath, name);
 913         }
 914         if (path == NULL) {
 915                 errno = ENOMEM;
 916                 goto fail;
 917         }
 918         pathlen = talloc_get_size(path)-1;
 919
 920         if (!shadow_copy2_find_slashes(talloc_tos(), path,
 921                                        &slashes, &num_slashes)) {
 922                 goto fail;
 923         }
 924
 925         insert = shadow_copy2_insert_string(talloc_tos(), handle, timestamp);
 926         if (insert == NULL) {
 927                 goto fail;
 928         }
 929         insertlen = talloc_get_size(insert)-1;
 930
 931         /*
 932          * Note: We deliberatly don't expensively initialize the
 933          * array with talloc_zero here: Putting zero into
 934          * converted[pathlen+insertlen] below is sufficient, because
 935          * in the following for loop, the insert string is inserted
 936          * at various slash places. So the memory up to position
 937          * pathlen+insertlen will always be initialized when the
 938          * converted string is used.
 939          */
 940         converted = talloc_array(mem_ctx, char, pathlen + insertlen + 1);
 941         if (converted == NULL) {
 942                 goto fail;
 943         }
 944
 945         if (path[pathlen-1] != '/') {
 946                 /*
 947                  * Append a fake slash to find the snapshot root
 948                  */
 949                 size_t *tmp;
 950                 tmp = talloc_realloc(talloc_tos(), slashes,
 951                                      size_t, num_slashes+1);
 952                 if (tmp == NULL) {
 953                         goto fail;
 954                 }
 955                 slashes = tmp;
 956                 slashes[num_slashes] = pathlen;
 957                 num_slashes += 1;
 958         }
 959
 960         min_offset = 0;
 961
 962         if (!config->crossmountpoints) {
 963                 min_offset = strlen(config->mount_point);
 964         }
 965
 966         memcpy(converted, path, pathlen+1);
 967         converted[pathlen+insertlen] = '\0';
 968
 969         ZERO_STRUCT(converted_fname);
 970         converted_fname.base_name = converted;
 971
 972         for (i = num_slashes-1; i>=0; i--) {
 973                 int ret;
 974                 size_t offset;
 975
 976                 offset = slashes[i];
 977
 978                 if (offset < min_offset) {
 979                         errno = ENOENT;
 980                         goto fail;
 981                 }
 982
 983                 if (offset >= connectlen) {
 984                         in_share_offset = offset;
 985                 }
 986
 987                 memcpy(converted+offset, insert, insertlen);
 988
 989                 offset += insertlen;
 990                 memcpy(converted+offset, path + slashes[i],
 991                        pathlen - slashes[i]);
 992
 993                 ret = SMB_VFS_NEXT_LSTAT(handle, &converted_fname);
 994
 995                 DEBUG(10, ("Trying[snapdirseverywhere] %s: %d (%s)\n",
 996                            converted,
 997                            ret, ret == 0 ? "ok" : strerror(errno)));
 998                 if (ret == 0) {
 999                         /* success */
1000                         if (snaproot_len != NULL) {
1001                                 *snaproot_len = in_share_offset + insertlen;
1002                         }
1003                         break;
1004                 }
1005                 if (errno == ENOTDIR) {
1006                         /*
1007                          * This is a valid condition: We appended the
1008                          * .snapshots/@GMT.. to a file name. Just try
1009                          * with the upper levels.
1010                          */
1011                         continue;
1012                 }
1013                 if (errno != ENOENT) {
1014                         /* Other problem than "not found" */
1015                         goto fail;
1016                 }
1017         }
1018
1019         if (i >= 0) {
1020                 /*
1021                  * Found something
1022                  */
1023                 DEBUG(10, ("Found %s\n", converted));
1024                 result = converted;
1025                 converted = NULL;
1026         } else {
1027                 errno = ENOENT;
1028         }
1029 fail:
1030         if (result == NULL) {
1031                 saved_errno = errno;
1032         }
1033         TALLOC_FREE(converted);
1034         TALLOC_FREE(insert);
1035         TALLOC_FREE(slashes);
1036         TALLOC_FREE(path);
1037         if (saved_errno != 0) {
1038                 errno = saved_errno;
1039         }
1040         return result;
1041 }
1042
1043 /**
1044  * Convert from a name as handed in via the SMB layer
1045  * and a timestamp into the local path of the snapshot
1046  * of the provided file at the provided time.
1047  */
1048 static char *shadow_copy2_convert(TALLOC_CTX *mem_ctx,
1049                                   struct vfs_handle_struct *handle,
1050                                   const char *name, time_t timestamp)
1051 {
1052         return shadow_copy2_do_convert(mem_ctx, handle, name, timestamp, NULL);
1053 }
1054
1055 /*
1056   modify a sbuf return to ensure that inodes in the shadow directory
1057   are different from those in the main directory
1058  */
1059 static void convert_sbuf(vfs_handle_struct *handle, const char *fname,
1060                          SMB_STRUCT_STAT *sbuf)
1061 {
1062         struct shadow_copy2_private *priv;
1063
1064         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1065                                 return);
1066
1067         if (priv->config->fixinodes) {
1068                 /* some snapshot systems, like GPFS, return the name
1069                    device:inode for the snapshot files as the current
1070                    files. That breaks the 'restore' button in the shadow copy
1071                    GUI, as the client gets a sharing violation.
1072
1073                    This is a crude way of allowing both files to be
1074                    open at once. It has a slight chance of inode
1075                    number collision, but I can't see a better approach
1076                    without significant VFS changes
1077                 */
1078                 TDB_DATA key = { .dptr = discard_const_p(uint8_t, fname),
1079                                  .dsize = strlen(fname) };
1080                 uint32_t shash;
1081
1082                 shash = tdb_jenkins_hash(&key) & 0xFF000000;
1083                 if (shash == 0) {
1084                         shash = 1;
1085                 }
1086                 sbuf->st_ex_ino ^= shash;
1087         }
1088 }
1089
1090 static DIR *shadow_copy2_opendir(vfs_handle_struct *handle,
1091                         const struct smb_filename *smb_fname,
1092                         const char *mask,
1093                         uint32_t attr)
1094 {
1095         time_t timestamp = 0;
1096         char *stripped = NULL;
1097         DIR *ret;
1098         int saved_errno = 0;
1099         char *conv;
1100         struct smb_filename *conv_smb_fname = NULL;
1101
1102         if (!shadow_copy2_strip_snapshot(talloc_tos(),
1103                                 handle,
1104                                 smb_fname->base_name,
1105                                 &timestamp,
1106                                 &stripped)) {
1107                 return NULL;
1108         }
1109         if (timestamp == 0) {
1110                 return SMB_VFS_NEXT_OPENDIR(handle, smb_fname, mask, attr);
1111         }
1112         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
1113         TALLOC_FREE(stripped);
1114         if (conv == NULL) {
1115                 return NULL;
1116         }
1117         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
1118                                         conv,
1119                                         NULL,
1120                                         NULL,
1121                                         smb_fname->flags);
1122         if (conv_smb_fname == NULL) {
1123                 TALLOC_FREE(conv);
1124                 return NULL;
1125         }
1126         ret = SMB_VFS_NEXT_OPENDIR(handle, conv_smb_fname, mask, attr);
1127         if (ret == NULL) {
1128                 saved_errno = errno;
1129         }
1130         TALLOC_FREE(conv);
1131         TALLOC_FREE(conv_smb_fname);
1132         if (saved_errno != 0) {
1133                 errno = saved_errno;
1134         }
1135         return ret;
1136 }
1137
1138 static int shadow_copy2_renameat(vfs_handle_struct *handle,
1139                                 files_struct *srcfsp,
1140                                 const struct smb_filename *smb_fname_src,
1141                                 files_struct *dstfsp,
1142                                 const struct smb_filename *smb_fname_dst)
1143 {
1144         time_t timestamp_src = 0;
1145         time_t timestamp_dst = 0;
1146         char *snappath_src = NULL;
1147         char *snappath_dst = NULL;
1148
1149         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(), handle,
1150                                          smb_fname_src->base_name,
1151                                          &timestamp_src, NULL, &snappath_src,
1152                                          NULL)) {
1153                 return -1;
1154         }
1155         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(), handle,
1156                                          smb_fname_dst->base_name,
1157                                          &timestamp_dst, NULL, &snappath_dst,
1158                                          NULL)) {
1159                 return -1;
1160         }
1161         if (timestamp_src != 0) {
1162                 errno = EXDEV;
1163                 return -1;
1164         }
1165         if (timestamp_dst != 0) {
1166                 errno = EROFS;
1167                 return -1;
1168         }
1169         /*
1170          * Don't allow rename on already converted paths.
1171          */
1172         if (snappath_src != NULL) {
1173                 errno = EXDEV;
1174                 return -1;
1175         }
1176         if (snappath_dst != NULL) {
1177                 errno = EROFS;
1178                 return -1;
1179         }
1180         return SMB_VFS_NEXT_RENAMEAT(handle,
1181                         srcfsp,
1182                         smb_fname_src,
1183                         dstfsp,
1184                         smb_fname_dst);
1185 }
1186
1187 static int shadow_copy2_symlinkat(vfs_handle_struct *handle,
1188                         const char *link_contents,
1189                         struct files_struct *dirfsp,
1190                         const struct smb_filename *new_smb_fname)
1191 {
1192         time_t timestamp_old = 0;
1193         time_t timestamp_new = 0;
1194         char *snappath_old = NULL;
1195         char *snappath_new = NULL;
1196
1197         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
1198                                 handle,
1199                                 link_contents,
1200                                 &timestamp_old,
1201                                 NULL,
1202                                 &snappath_old,
1203                                 NULL)) {
1204                 return -1;
1205         }
1206         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
1207                                 handle,
1208                                 new_smb_fname->base_name,
1209                                 &timestamp_new,
1210                                 NULL,
1211                                 &snappath_new,
1212                                 NULL)) {
1213                 return -1;
1214         }
1215         if ((timestamp_old != 0) || (timestamp_new != 0)) {
1216                 errno = EROFS;
1217                 return -1;
1218         }
1219         /*
1220          * Don't allow symlinks on already converted paths.
1221          */
1222         if ((snappath_old != NULL) || (snappath_new != NULL)) {
1223                 errno = EROFS;
1224                 return -1;
1225         }
1226         return SMB_VFS_NEXT_SYMLINKAT(handle,
1227                                 link_contents,
1228                                 dirfsp,
1229                                 new_smb_fname);
1230 }
1231
1232 static int shadow_copy2_linkat(vfs_handle_struct *handle,
1233                         files_struct *srcfsp,
1234                         const struct smb_filename *old_smb_fname,
1235                         files_struct *dstfsp,
1236                         const struct smb_filename *new_smb_fname,
1237                         int flags)
1238 {
1239         time_t timestamp_old = 0;
1240         time_t timestamp_new = 0;
1241         char *snappath_old = NULL;
1242         char *snappath_new = NULL;
1243
1244         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
1245                                 handle,
1246                                 old_smb_fname->base_name,
1247                                 &timestamp_old,
1248                                 NULL,
1249                                 &snappath_old,
1250                                 NULL)) {
1251                 return -1;
1252         }
1253         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
1254                                 handle,
1255                                 new_smb_fname->base_name,
1256                                 &timestamp_new,
1257                                 NULL,
1258                                 &snappath_new,
1259                                 NULL)) {
1260                 return -1;
1261         }
1262         if ((timestamp_old != 0) || (timestamp_new != 0)) {
1263                 errno = EROFS;
1264                 return -1;
1265         }
1266         /*
1267          * Don't allow links on already converted paths.
1268          */
1269         if ((snappath_old != NULL) || (snappath_new != NULL)) {
1270                 errno = EROFS;
1271                 return -1;
1272         }
1273         return SMB_VFS_NEXT_LINKAT(handle,
1274                         srcfsp,
1275                         old_smb_fname,
1276                         dstfsp,
1277                         new_smb_fname,
1278                         flags);
1279 }
1280
1281 static int shadow_copy2_stat(vfs_handle_struct *handle,
1282                              struct smb_filename *smb_fname)
1283 {
1284         time_t timestamp = 0;
1285         char *stripped = NULL;
1286         char *tmp;
1287         int saved_errno = 0;
1288         int ret;
1289
1290         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1291                                          smb_fname->base_name,
1292                                          &timestamp, &stripped)) {
1293                 return -1;
1294         }
1295         if (timestamp == 0) {
1296                 return SMB_VFS_NEXT_STAT(handle, smb_fname);
1297         }
1298
1299         tmp = smb_fname->base_name;
1300         smb_fname->base_name = shadow_copy2_convert(
1301                 talloc_tos(), handle, stripped, timestamp);
1302         TALLOC_FREE(stripped);
1303
1304         if (smb_fname->base_name == NULL) {
1305                 smb_fname->base_name = tmp;
1306                 return -1;
1307         }
1308
1309         ret = SMB_VFS_NEXT_STAT(handle, smb_fname);
1310         if (ret == -1) {
1311                 saved_errno = errno;
1312         }
1313
1314         TALLOC_FREE(smb_fname->base_name);
1315         smb_fname->base_name = tmp;
1316
1317         if (ret == 0) {
1318                 convert_sbuf(handle, smb_fname->base_name, &smb_fname->st);
1319         }
1320         if (saved_errno != 0) {
1321                 errno = saved_errno;
1322         }
1323         return ret;
1324 }
1325
1326 static int shadow_copy2_lstat(vfs_handle_struct *handle,
1327                               struct smb_filename *smb_fname)
1328 {
1329         time_t timestamp = 0;
1330         char *stripped = NULL;
1331         char *tmp;
1332         int saved_errno = 0;
1333         int ret;
1334
1335         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1336                                          smb_fname->base_name,
1337                                          &timestamp, &stripped)) {
1338                 return -1;
1339         }
1340         if (timestamp == 0) {
1341                 return SMB_VFS_NEXT_LSTAT(handle, smb_fname);
1342         }
1343
1344         tmp = smb_fname->base_name;
1345         smb_fname->base_name = shadow_copy2_convert(
1346                 talloc_tos(), handle, stripped, timestamp);
1347         TALLOC_FREE(stripped);
1348
1349         if (smb_fname->base_name == NULL) {
1350                 smb_fname->base_name = tmp;
1351                 return -1;
1352         }
1353
1354         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
1355         if (ret == -1) {
1356                 saved_errno = errno;
1357         }
1358
1359         TALLOC_FREE(smb_fname->base_name);
1360         smb_fname->base_name = tmp;
1361
1362         if (ret == 0) {
1363                 convert_sbuf(handle, smb_fname->base_name, &smb_fname->st);
1364         }
1365         if (saved_errno != 0) {
1366                 errno = saved_errno;
1367         }
1368         return ret;
1369 }
1370
1371 static int shadow_copy2_fstat(vfs_handle_struct *handle, files_struct *fsp,
1372                               SMB_STRUCT_STAT *sbuf)
1373 {
1374         time_t timestamp = 0;
1375         struct smb_filename *orig_smb_fname = NULL;
1376         struct smb_filename vss_smb_fname;
1377         struct smb_filename *orig_base_smb_fname = NULL;
1378         struct smb_filename vss_base_smb_fname;
1379         char *stripped = NULL;
1380         int saved_errno = 0;
1381         bool ok;
1382         int ret;
1383
1384         ok = shadow_copy2_strip_snapshot(talloc_tos(), handle,
1385                                          fsp->fsp_name->base_name,
1386                                          &timestamp, &stripped);
1387         if (!ok) {
1388                 return -1;
1389         }
1390
1391         if (timestamp == 0) {
1392                 TALLOC_FREE(stripped);
1393                 return SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
1394         }
1395
1396         vss_smb_fname = *fsp->fsp_name;
1397         vss_smb_fname.base_name = shadow_copy2_convert(talloc_tos(),
1398                                                        handle,
1399                                                        stripped,
1400                                                        timestamp);
1401         TALLOC_FREE(stripped);
1402         if (vss_smb_fname.base_name == NULL) {
1403                 return -1;
1404         }
1405
1406         orig_smb_fname = fsp->fsp_name;
1407         fsp->fsp_name = &vss_smb_fname;
1408
1409         if (fsp->base_fsp != NULL) {
1410                 vss_base_smb_fname = *fsp->base_fsp->fsp_name;
1411                 vss_base_smb_fname.base_name = vss_smb_fname.base_name;
1412                 orig_base_smb_fname = fsp->base_fsp->fsp_name;
1413                 fsp->base_fsp->fsp_name = &vss_base_smb_fname;
1414         }
1415
1416         ret = SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
1417         fsp->fsp_name = orig_smb_fname;
1418         if (fsp->base_fsp != NULL) {
1419                 fsp->base_fsp->fsp_name = orig_base_smb_fname;
1420         }
1421         if (ret == -1) {
1422                 saved_errno = errno;
1423         }
1424
1425         if (ret == 0) {
1426                 convert_sbuf(handle, fsp->fsp_name->base_name, sbuf);
1427         }
1428         if (saved_errno != 0) {
1429                 errno = saved_errno;
1430         }
1431         return ret;
1432 }
1433
1434 static int shadow_copy2_open(vfs_handle_struct *handle,
1435                              struct smb_filename *smb_fname, files_struct *fsp,
1436                              int flags, mode_t mode)
1437 {
1438         time_t timestamp = 0;
1439         char *stripped = NULL;
1440         char *tmp;
1441         bool is_converted = false;
1442         int saved_errno = 0;
1443         int ret;
1444
1445         if (!shadow_copy2_strip_snapshot_converted(talloc_tos(), handle,
1446                                          smb_fname->base_name,
1447                                          &timestamp, &stripped,
1448                                          &is_converted)) {
1449                 return -1;
1450         }
1451         if (timestamp == 0) {
1452                 if (is_converted) {
1453                         /*
1454                          * Just pave over the user requested mode and use
1455                          * O_RDONLY. Later attempts by the client to write on
1456                          * the handle will fail in the pwrite() syscall with
1457                          * EINVAL which we carefully map to EROFS. In sum, this
1458                          * matches Windows behaviour.
1459                          */
1460                         flags = O_RDONLY;
1461                 }
1462                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
1463         }
1464
1465         tmp = smb_fname->base_name;
1466         smb_fname->base_name = shadow_copy2_convert(
1467                 talloc_tos(), handle, stripped, timestamp);
1468         TALLOC_FREE(stripped);
1469
1470         if (smb_fname->base_name == NULL) {
1471                 smb_fname->base_name = tmp;
1472                 return -1;
1473         }
1474
1475         /*
1476          * Just pave over the user requested mode and use O_RDONLY. Later
1477          * attempts by the client to write on the handle will fail in the
1478          * pwrite() syscall with EINVAL which we carefully map to EROFS. In sum,
1479          * this matches Windows behaviour.
1480          */
1481         flags = O_RDONLY;
1482
1483         ret = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
1484         if (ret == -1) {
1485                 saved_errno = errno;
1486         }
1487
1488         TALLOC_FREE(smb_fname->base_name);
1489         smb_fname->base_name = tmp;
1490
1491         if (saved_errno != 0) {
1492                 errno = saved_errno;
1493         }
1494         return ret;
1495 }
1496
1497 static int shadow_copy2_unlink(vfs_handle_struct *handle,
1498                                const struct smb_filename *smb_fname)
1499 {
1500         time_t timestamp = 0;
1501
1502         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1503                                          smb_fname->base_name,
1504                                          &timestamp, NULL)) {
1505                 return -1;
1506         }
1507         if (timestamp != 0) {
1508                 errno = EROFS;
1509                 return -1;
1510         }
1511         return SMB_VFS_NEXT_UNLINK(handle, smb_fname);
1512 }
1513
1514 static int shadow_copy2_unlinkat(vfs_handle_struct *handle,
1515                         struct files_struct *dirfsp,
1516                         const struct smb_filename *smb_fname,
1517                         int flags)
1518 {
1519         time_t timestamp = 0;
1520
1521         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1522                                          smb_fname->base_name,
1523                                          &timestamp, NULL)) {
1524                 return -1;
1525         }
1526         if (timestamp != 0) {
1527                 errno = EROFS;
1528                 return -1;
1529         }
1530         return SMB_VFS_NEXT_UNLINKAT(handle,
1531                         dirfsp,
1532                         smb_fname,
1533                         flags);
1534 }
1535
1536 static int shadow_copy2_chmod(vfs_handle_struct *handle,
1537                         const struct smb_filename *smb_fname,
1538                         mode_t mode)
1539 {
1540         time_t timestamp = 0;
1541
1542         if (!shadow_copy2_strip_snapshot(talloc_tos(),
1543                                 handle,
1544                                 smb_fname->base_name,
1545                                 &timestamp,
1546                                 NULL)) {
1547                 return -1;
1548         }
1549         if (timestamp != 0) {
1550                 errno = EROFS;
1551                 return -1;
1552         }
1553         return SMB_VFS_NEXT_CHMOD(handle, smb_fname, mode);
1554 }
1555
1556 static int shadow_copy2_chown(vfs_handle_struct *handle,
1557                         const struct smb_filename *smb_fname,
1558                         uid_t uid,
1559                         gid_t gid)
1560 {
1561         time_t timestamp = 0;
1562
1563         if (!shadow_copy2_strip_snapshot(talloc_tos(),
1564                                 handle,
1565                                 smb_fname->base_name,
1566                                 &timestamp,
1567                                 NULL)) {
1568                 return -1;
1569         }
1570         if (timestamp != 0) {
1571                 errno = EROFS;
1572                 return -1;
1573         }
1574         return SMB_VFS_NEXT_CHOWN(handle, smb_fname, uid, gid);
1575 }
1576
1577 static void store_cwd_data(vfs_handle_struct *handle,
1578                                 const char *connectpath)
1579 {
1580         struct shadow_copy2_private *priv = NULL;
1581         struct smb_filename *cwd_fname = NULL;
1582
1583         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1584                                 return);
1585
1586         TALLOC_FREE(priv->shadow_cwd);
1587         cwd_fname = SMB_VFS_NEXT_GETWD(handle, talloc_tos());
1588         if (cwd_fname == NULL) {
1589                 smb_panic("getwd failed\n");
1590         }
1591         DBG_DEBUG("shadow cwd = %s\n", cwd_fname->base_name);
1592         priv->shadow_cwd = talloc_strdup(priv, cwd_fname->base_name);
1593         TALLOC_FREE(cwd_fname);
1594         if (priv->shadow_cwd == NULL) {
1595                 smb_panic("talloc failed\n");
1596         }
1597         TALLOC_FREE(priv->shadow_connectpath);
1598         if (connectpath) {
1599                 DBG_DEBUG("shadow conectpath = %s\n", connectpath);
1600                 priv->shadow_connectpath = talloc_strdup(priv, connectpath);
1601                 if (priv->shadow_connectpath == NULL) {
1602                         smb_panic("talloc failed\n");
1603                 }
1604         }
1605 }
1606
1607 static int shadow_copy2_chdir(vfs_handle_struct *handle,
1608                                const struct smb_filename *smb_fname)
1609 {
1610         time_t timestamp = 0;
1611         char *stripped = NULL;
1612         char *snappath = NULL;
1613         int ret = -1;
1614         int saved_errno = 0;
1615         char *conv = NULL;
1616         size_t rootpath_len = 0;
1617         struct smb_filename *conv_smb_fname = NULL;
1618
1619         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
1620                                         handle,
1621                                         smb_fname->base_name,
1622                                         &timestamp,
1623                                         &stripped,
1624                                         &snappath,
1625                                         NULL)) {
1626                 return -1;
1627         }
1628         if (stripped != NULL) {
1629                 conv = shadow_copy2_do_convert(talloc_tos(),
1630                                                 handle,
1631                                                 stripped,
1632                                                 timestamp,
1633                                                 &rootpath_len);
1634                 TALLOC_FREE(stripped);
1635                 if (conv == NULL) {
1636                         return -1;
1637                 }
1638                 conv_smb_fname = synthetic_smb_fname(talloc_tos(),
1639                                         conv,
1640                                         NULL,
1641                                         NULL,
1642                                         smb_fname->flags);
1643         } else {
1644                 conv_smb_fname = cp_smb_filename(talloc_tos(), smb_fname);
1645         }
1646
1647         if (conv_smb_fname == NULL) {
1648                 TALLOC_FREE(conv);
1649                 errno = ENOMEM;
1650                 return -1;
1651         }
1652
1653         ret = SMB_VFS_NEXT_CHDIR(handle, conv_smb_fname);
1654         if (ret == -1) {
1655                 saved_errno = errno;
1656         }
1657
1658         if (ret == 0) {
1659                 if (conv != NULL && rootpath_len != 0) {
1660                         conv[rootpath_len] = '\0';
1661                 } else if (snappath != 0) {
1662                         TALLOC_FREE(conv);
1663                         conv = snappath;
1664                 }
1665                 store_cwd_data(handle, conv);
1666         }
1667
1668         TALLOC_FREE(stripped);
1669         TALLOC_FREE(conv);
1670         TALLOC_FREE(conv_smb_fname);
1671
1672         if (saved_errno != 0) {
1673                 errno = saved_errno;
1674         }
1675         return ret;
1676 }
1677
1678 static int shadow_copy2_ntimes(vfs_handle_struct *handle,
1679                                const struct smb_filename *smb_fname,
1680                                struct smb_file_time *ft)
1681 {
1682         time_t timestamp = 0;
1683
1684         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1685                                          smb_fname->base_name,
1686                                          &timestamp, NULL)) {
1687                 return -1;
1688         }
1689         if (timestamp != 0) {
1690                 errno = EROFS;
1691                 return -1;
1692         }
1693         return SMB_VFS_NEXT_NTIMES(handle, smb_fname, ft);
1694 }
1695
1696 static int shadow_copy2_readlinkat(vfs_handle_struct *handle,
1697                                 files_struct *dirfsp,
1698                                 const struct smb_filename *smb_fname,
1699                                 char *buf,
1700                                 size_t bufsiz)
1701 {
1702         time_t timestamp = 0;
1703         char *stripped = NULL;
1704         int saved_errno = 0;
1705         int ret;
1706         struct smb_filename *conv = NULL;
1707
1708         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1709                                          smb_fname->base_name,
1710                                          &timestamp, &stripped)) {
1711                 return -1;
1712         }
1713         if (timestamp == 0) {
1714                 return SMB_VFS_NEXT_READLINKAT(handle,
1715                                 dirfsp,
1716                                 smb_fname,
1717                                 buf,
1718                                 bufsiz);
1719         }
1720         conv = cp_smb_filename(talloc_tos(), smb_fname);
1721         if (conv == NULL) {
1722                 TALLOC_FREE(stripped);
1723                 errno = ENOMEM;
1724                 return -1;
1725         }
1726         conv->base_name = shadow_copy2_convert(
1727                 conv, handle, stripped, timestamp);
1728         TALLOC_FREE(stripped);
1729         if (conv->base_name == NULL) {
1730                 return -1;
1731         }
1732         ret = SMB_VFS_NEXT_READLINKAT(handle,
1733                                 dirfsp,
1734                                 conv,
1735                                 buf,
1736                                 bufsiz);
1737         if (ret == -1) {
1738                 saved_errno = errno;
1739         }
1740         TALLOC_FREE(conv);
1741         if (saved_errno != 0) {
1742                 errno = saved_errno;
1743         }
1744         return ret;
1745 }
1746
1747 static int shadow_copy2_mknodat(vfs_handle_struct *handle,
1748                         files_struct *dirfsp,
1749                         const struct smb_filename *smb_fname,
1750                         mode_t mode,
1751                         SMB_DEV_T dev)
1752 {
1753         time_t timestamp = 0;
1754
1755         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1756                                          smb_fname->base_name,
1757                                          &timestamp, NULL)) {
1758                 return -1;
1759         }
1760         if (timestamp != 0) {
1761                 errno = EROFS;
1762                 return -1;
1763         }
1764         return SMB_VFS_NEXT_MKNODAT(handle,
1765                         dirfsp,
1766                         smb_fname,
1767                         mode,
1768                         dev);
1769 }
1770
1771 static struct smb_filename *shadow_copy2_realpath(vfs_handle_struct *handle,
1772                                 TALLOC_CTX *ctx,
1773                                 const struct smb_filename *smb_fname)
1774 {
1775         time_t timestamp = 0;
1776         char *stripped = NULL;
1777         struct smb_filename *result_fname = NULL;
1778         struct smb_filename *conv_fname = NULL;
1779         int saved_errno = 0;
1780
1781         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1782                                 smb_fname->base_name,
1783                                 &timestamp, &stripped)) {
1784                 goto done;
1785         }
1786         if (timestamp == 0) {
1787                 return SMB_VFS_NEXT_REALPATH(handle, ctx, smb_fname);
1788         }
1789
1790         conv_fname = cp_smb_filename(talloc_tos(), smb_fname);
1791         if (conv_fname == NULL) {
1792                 goto done;
1793         }
1794         conv_fname->base_name = shadow_copy2_convert(
1795                 conv_fname, handle, stripped, timestamp);
1796         if (conv_fname->base_name == NULL) {
1797                 goto done;
1798         }
1799
1800         result_fname = SMB_VFS_NEXT_REALPATH(handle, ctx, conv_fname);
1801
1802 done:
1803         if (result_fname == NULL) {
1804                 saved_errno = errno;
1805         }
1806         TALLOC_FREE(conv_fname);
1807         TALLOC_FREE(stripped);
1808         if (saved_errno != 0) {
1809                 errno = saved_errno;
1810         }
1811         return result_fname;
1812 }
1813
1814 /**
1815  * Check whether a given directory contains a
1816  * snapshot directory as direct subdirectory.
1817  * If yes, return the path of the snapshot-subdir,
1818  * otherwise return NULL.
1819  */
1820 static char *have_snapdir(struct vfs_handle_struct *handle,
1821                           const char *path)
1822 {
1823         struct smb_filename smb_fname;
1824         int ret;
1825         struct shadow_copy2_private *priv;
1826
1827         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1828                                 return NULL);
1829
1830         ZERO_STRUCT(smb_fname);
1831         smb_fname.base_name = talloc_asprintf(talloc_tos(), "%s/%s",
1832                                               path, priv->config->snapdir);
1833         if (smb_fname.base_name == NULL) {
1834                 return NULL;
1835         }
1836
1837         ret = SMB_VFS_NEXT_STAT(handle, &smb_fname);
1838         if ((ret == 0) && (S_ISDIR(smb_fname.st.st_ex_mode))) {
1839                 return smb_fname.base_name;
1840         }
1841         TALLOC_FREE(smb_fname.base_name);
1842         return NULL;
1843 }
1844
1845 static bool check_access_snapdir(struct vfs_handle_struct *handle,
1846                                 const char *path)
1847 {
1848         struct smb_filename smb_fname;
1849         int ret;
1850         NTSTATUS status;
1851
1852         ZERO_STRUCT(smb_fname);
1853         smb_fname.base_name = talloc_asprintf(talloc_tos(),
1854                                                 "%s",
1855                                                 path);
1856         if (smb_fname.base_name == NULL) {
1857                 return false;
1858         }
1859
1860         ret = SMB_VFS_NEXT_STAT(handle, &smb_fname);
1861         if (ret != 0 || !S_ISDIR(smb_fname.st.st_ex_mode)) {
1862                 TALLOC_FREE(smb_fname.base_name);
1863                 return false;
1864         }
1865
1866         status = smbd_check_access_rights(handle->conn,
1867                                         &smb_fname,
1868                                         false,
1869                                         SEC_DIR_LIST);
1870         if (!NT_STATUS_IS_OK(status)) {
1871                 DEBUG(0,("user does not have list permission "
1872                         "on snapdir %s\n",
1873                         smb_fname.base_name));
1874                 TALLOC_FREE(smb_fname.base_name);
1875                 return false;
1876         }
1877         TALLOC_FREE(smb_fname.base_name);
1878         return true;
1879 }
1880
1881 /**
1882  * Find the snapshot directory (if any) for the given
1883  * filename (which is relative to the share).
1884  */
1885 static const char *shadow_copy2_find_snapdir(TALLOC_CTX *mem_ctx,
1886                                              struct vfs_handle_struct *handle,
1887                                              struct smb_filename *smb_fname)
1888 {
1889         char *path, *p;
1890         const char *snapdir;
1891         struct shadow_copy2_config *config;
1892         struct shadow_copy2_private *priv;
1893
1894         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1895                                 return NULL);
1896
1897         config = priv->config;
1898
1899         /*
1900          * If the non-snapdisrseverywhere mode, we should not search!
1901          */
1902         if (!config->snapdirseverywhere) {
1903                 return config->snapshot_basepath;
1904         }
1905
1906         path = talloc_asprintf(mem_ctx, "%s/%s",
1907                                handle->conn->connectpath,
1908                                smb_fname->base_name);
1909         if (path == NULL) {
1910                 return NULL;
1911         }
1912
1913         snapdir = have_snapdir(handle, path);
1914         if (snapdir != NULL) {
1915                 TALLOC_FREE(path);
1916                 return snapdir;
1917         }
1918
1919         while ((p = strrchr(path, '/')) && (p > path)) {
1920
1921                 p[0] = '\0';
1922
1923                 snapdir = have_snapdir(handle, path);
1924                 if (snapdir != NULL) {
1925                         TALLOC_FREE(path);
1926                         return snapdir;
1927                 }
1928         }
1929         TALLOC_FREE(path);
1930         return NULL;
1931 }
1932
1933 static bool shadow_copy2_snapshot_to_gmt(vfs_handle_struct *handle,
1934                                          const char *name,
1935                                          char *gmt, size_t gmt_len)
1936 {
1937         struct tm timestamp;
1938         time_t timestamp_t;
1939         unsigned long int timestamp_long;
1940         const char *fmt;
1941         struct shadow_copy2_config *config;
1942         struct shadow_copy2_private *priv;
1943         char *tmpstr = NULL;
1944         char *tmp = NULL;
1945         bool converted = false;
1946         int ret = -1;
1947
1948         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1949                                 return NULL);
1950
1951         config = priv->config;
1952
1953         fmt = config->gmt_format;
1954
1955         /*
1956          * If regex is provided, then we will have to parse the
1957          * filename which will contain both the prefix and the time format.
1958          * e.g. <prefix><delimiter><time_format>
1959          */
1960         if (priv->snaps->regex != NULL) {
1961                 tmpstr = talloc_strdup(talloc_tos(), name);
1962                 /* point "name" to the time format */
1963                 name = strstr(name, priv->config->delimiter);
1964                 if (name == NULL) {
1965                         goto done;
1966                 }
1967                 /* Extract the prefix */
1968                 tmp = strstr(tmpstr, priv->config->delimiter);
1969                 if (tmp == NULL) {
1970                         goto done;
1971                 }
1972                 *tmp = '\0';
1973
1974                 /* Parse regex */
1975                 ret = regexec(priv->snaps->regex, tmpstr, 0, NULL, 0);
1976                 if (ret) {
1977                         DBG_DEBUG("shadow_copy2_snapshot_to_gmt: "
1978                                   "no regex match for %s\n", tmpstr);
1979                         goto done;
1980                 }
1981         }
1982
1983         ZERO_STRUCT(timestamp);
1984         if (config->use_sscanf) {
1985                 if (sscanf(name, fmt, &timestamp_long) != 1) {
1986                         DEBUG(10, ("shadow_copy2_snapshot_to_gmt: "
1987                                    "no sscanf match %s: %s\n",
1988                                    fmt, name));
1989                         goto done;
1990                 }
1991                 timestamp_t = timestamp_long;
1992                 gmtime_r(&timestamp_t, &timestamp);
1993         } else {
1994                 if (strptime(name, fmt, &timestamp) == NULL) {
1995                         DEBUG(10, ("shadow_copy2_snapshot_to_gmt: "
1996                                    "no match %s: %s\n",
1997                                    fmt, name));
1998                         goto done;
1999                 }
2000                 DEBUG(10, ("shadow_copy2_snapshot_to_gmt: match %s: %s\n",
2001                            fmt, name));
2002
2003                 if (config->use_localtime) {
2004                         timestamp.tm_isdst = -1;
2005                         timestamp_t = mktime(&timestamp);
2006                         gmtime_r(&timestamp_t, &timestamp);
2007                 }
2008         }
2009
2010         strftime(gmt, gmt_len, GMT_FORMAT, &timestamp);
2011         converted = true;
2012
2013 done:
2014         TALLOC_FREE(tmpstr);
2015         return converted;
2016 }
2017
2018 static int shadow_copy2_label_cmp_asc(const void *x, const void *y)
2019 {
2020         return strncmp((const char *)x, (const char *)y, sizeof(SHADOW_COPY_LABEL));
2021 }
2022
2023 static int shadow_copy2_label_cmp_desc(const void *x, const void *y)
2024 {
2025         return -strncmp((const char *)x, (const char *)y, sizeof(SHADOW_COPY_LABEL));
2026 }
2027
2028 /*
2029   sort the shadow copy data in ascending or descending order
2030  */
2031 static void shadow_copy2_sort_data(vfs_handle_struct *handle,
2032                                    struct shadow_copy_data *shadow_copy2_data)
2033 {
2034         int (*cmpfunc)(const void *, const void *);
2035         const char *sort;
2036         struct shadow_copy2_private *priv;
2037
2038         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
2039                                 return);
2040
2041         sort = priv->config->sort_order;
2042         if (sort == NULL) {
2043                 return;
2044         }
2045
2046         if (strcmp(sort, "asc") == 0) {
2047                 cmpfunc = shadow_copy2_label_cmp_asc;
2048         } else if (strcmp(sort, "desc") == 0) {
2049                 cmpfunc = shadow_copy2_label_cmp_desc;
2050         } else {
2051                 return;
2052         }
2053
2054         if (shadow_copy2_data && shadow_copy2_data->num_volumes > 0 &&
2055             shadow_copy2_data->labels)
2056         {
2057                 TYPESAFE_QSORT(shadow_copy2_data->labels,
2058                                shadow_copy2_data->num_volumes,
2059                                cmpfunc);
2060         }
2061 }
2062
2063 static int shadow_copy2_get_shadow_copy_data(
2064         vfs_handle_struct *handle, files_struct *fsp,
2065         struct shadow_copy_data *shadow_copy2_data,
2066         bool labels)
2067 {
2068         DIR *p;
2069         const char *snapdir;
2070         struct smb_filename *snapdir_smb_fname = NULL;
2071         struct dirent *d;
2072         TALLOC_CTX *tmp_ctx = talloc_stackframe();
2073         struct shadow_copy2_private *priv = NULL;
2074         struct shadow_copy2_snapentry *tmpentry = NULL;
2075         bool get_snaplist = false;
2076         bool access_granted = false;
2077         int ret = -1;
2078
2079         snapdir = shadow_copy2_find_snapdir(tmp_ctx, handle, fsp->fsp_name);
2080         if (snapdir == NULL) {
2081                 DEBUG(0,("shadow:snapdir not found for %s in get_shadow_copy_data\n",
2082                          handle->conn->connectpath));
2083                 errno = EINVAL;
2084                 goto done;
2085         }
2086
2087         access_granted = check_access_snapdir(handle, snapdir);
2088         if (!access_granted) {
2089                 DEBUG(0,("access denied on listing snapdir %s\n", snapdir));
2090                 errno = EACCES;
2091                 goto done;
2092         }
2093
2094         snapdir_smb_fname = synthetic_smb_fname(talloc_tos(),
2095                                         snapdir,
2096                                         NULL,
2097                                         NULL,
2098                                         fsp->fsp_name->flags);
2099         if (snapdir_smb_fname == NULL) {
2100                 errno = ENOMEM;
2101                 goto done;
2102         }
2103
2104         p = SMB_VFS_NEXT_OPENDIR(handle, snapdir_smb_fname, NULL, 0);
2105
2106         if (!p) {
2107                 DEBUG(2,("shadow_copy2: SMB_VFS_NEXT_OPENDIR() failed for '%s'"
2108                          " - %s\n", snapdir, strerror(errno)));
2109                 errno = ENOSYS;
2110                 goto done;
2111         }
2112
2113         if (shadow_copy2_data != NULL) {
2114                 shadow_copy2_data->num_volumes = 0;
2115                 shadow_copy2_data->labels      = NULL;
2116         }
2117
2118         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
2119                                 goto done);
2120
2121         /*
2122          * Normally this function is called twice once with labels = false and
2123          * then with labels = true. When labels is false it will return the
2124          * number of volumes so that the caller can allocate memory for that
2125          * many labels. Therefore to eliminate snaplist both the times it is
2126          * good to check if labels is set or not.
2127          *
2128          * shadow_copy2_data is NULL when we only want to update the list and
2129          * don't want any labels.
2130          */
2131         if ((priv->snaps->regex != NULL) && (labels || shadow_copy2_data == NULL)) {
2132                 get_snaplist = true;
2133                 /* Reset the global snaplist */
2134                 shadow_copy2_delete_snaplist(priv);
2135
2136                 /* Set the current time as snaplist update time */
2137                 time(&(priv->snaps->fetch_time));
2138         }
2139
2140         while ((d = SMB_VFS_NEXT_READDIR(handle, p, NULL))) {
2141                 char snapshot[GMT_NAME_LEN+1];
2142                 SHADOW_COPY_LABEL *tlabels;
2143
2144                 /*
2145                  * ignore names not of the right form in the snapshot
2146                  * directory
2147                  */
2148                 if (!shadow_copy2_snapshot_to_gmt(
2149                             handle, d->d_name,
2150                             snapshot, sizeof(snapshot))) {
2151
2152                         DEBUG(6, ("shadow_copy2_get_shadow_copy_data: "
2153                                   "ignoring %s\n", d->d_name));
2154                         continue;
2155                 }
2156                 DEBUG(6,("shadow_copy2_get_shadow_copy_data: %s -> %s\n",
2157                          d->d_name, snapshot));
2158
2159                 if (get_snaplist) {
2160                         /*
2161                          * Create a snap entry for each successful
2162                          * pattern match.
2163                          */
2164                         tmpentry = shadow_copy2_create_snapentry(priv);
2165                         if (tmpentry == NULL) {
2166                                 DBG_ERR("talloc_zero() failed\n");
2167                                 goto done;
2168                         }
2169                         tmpentry->snapname = talloc_strdup(tmpentry, d->d_name);
2170                         tmpentry->time_fmt = talloc_strdup(tmpentry, snapshot);
2171                 }
2172
2173                 if (shadow_copy2_data == NULL) {
2174                         continue;
2175                 }
2176
2177                 if (!labels) {
2178                         /* the caller doesn't want the labels */
2179                         shadow_copy2_data->num_volumes++;
2180                         continue;
2181                 }
2182
2183                 tlabels = talloc_realloc(shadow_copy2_data,
2184                                          shadow_copy2_data->labels,
2185                                          SHADOW_COPY_LABEL,
2186                                          shadow_copy2_data->num_volumes+1);
2187                 if (tlabels == NULL) {
2188                         DEBUG(0,("shadow_copy2: out of memory\n"));
2189                         SMB_VFS_NEXT_CLOSEDIR(handle, p);
2190                         goto done;
2191                 }
2192
2193                 strlcpy(tlabels[shadow_copy2_data->num_volumes], snapshot,
2194                         sizeof(*tlabels));
2195
2196                 shadow_copy2_data->num_volumes++;
2197                 shadow_copy2_data->labels = tlabels;
2198         }
2199
2200         SMB_VFS_NEXT_CLOSEDIR(handle,p);
2201
2202         shadow_copy2_sort_data(handle, shadow_copy2_data);
2203         ret = 0;
2204
2205 done:
2206         TALLOC_FREE(tmp_ctx);
2207         return ret;
2208 }
2209
2210 static NTSTATUS shadow_copy2_fget_nt_acl(vfs_handle_struct *handle,
2211                                         struct files_struct *fsp,
2212                                         uint32_t security_info,
2213                                          TALLOC_CTX *mem_ctx,
2214                                         struct security_descriptor **ppdesc)
2215 {
2216         time_t timestamp = 0;
2217         char *stripped = NULL;
2218         NTSTATUS status;
2219         char *conv;
2220         struct smb_filename *smb_fname = NULL;
2221
2222         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
2223                                          fsp->fsp_name->base_name,
2224                                          &timestamp, &stripped)) {
2225                 return map_nt_error_from_unix(errno);
2226         }
2227         if (timestamp == 0) {
2228                 return SMB_VFS_NEXT_FGET_NT_ACL(handle, fsp, security_info,
2229                                                 mem_ctx,
2230                                                 ppdesc);
2231         }
2232         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2233         TALLOC_FREE(stripped);
2234         if (conv == NULL) {
2235                 return map_nt_error_from_unix(errno);
2236         }
2237         smb_fname = synthetic_smb_fname(talloc_tos(),
2238                                         conv,
2239                                         NULL,
2240                                         NULL,
2241                                         fsp->fsp_name->flags);
2242         if (smb_fname == NULL) {
2243                 TALLOC_FREE(conv);
2244                 return NT_STATUS_NO_MEMORY;
2245         }
2246
2247         status = SMB_VFS_NEXT_GET_NT_ACL(handle, smb_fname, security_info,
2248                                          mem_ctx, ppdesc);
2249         TALLOC_FREE(conv);
2250         TALLOC_FREE(smb_fname);
2251         return status;
2252 }
2253
2254 static NTSTATUS shadow_copy2_get_nt_acl(vfs_handle_struct *handle,
2255                                         const struct smb_filename *smb_fname,
2256                                         uint32_t security_info,
2257                                         TALLOC_CTX *mem_ctx,
2258                                         struct security_descriptor **ppdesc)
2259 {
2260         time_t timestamp = 0;
2261         char *stripped = NULL;
2262         NTSTATUS status;
2263         char *conv;
2264         struct smb_filename *conv_smb_fname = NULL;
2265
2266         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2267                                         handle,
2268                                         smb_fname->base_name,
2269                                         &timestamp,
2270                                         &stripped)) {
2271                 return map_nt_error_from_unix(errno);
2272         }
2273         if (timestamp == 0) {
2274                 return SMB_VFS_NEXT_GET_NT_ACL(handle, smb_fname, security_info,
2275                                                mem_ctx, ppdesc);
2276         }
2277         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2278         TALLOC_FREE(stripped);
2279         if (conv == NULL) {
2280                 return map_nt_error_from_unix(errno);
2281         }
2282         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2283                                         conv,
2284                                         NULL,
2285                                         NULL,
2286                                         smb_fname->flags);
2287         if (conv_smb_fname == NULL) {
2288                 TALLOC_FREE(conv);
2289                 return NT_STATUS_NO_MEMORY;
2290         }
2291         status = SMB_VFS_NEXT_GET_NT_ACL(handle, conv_smb_fname, security_info,
2292                                          mem_ctx, ppdesc);
2293         TALLOC_FREE(conv);
2294         TALLOC_FREE(conv_smb_fname);
2295         return status;
2296 }
2297
2298 static int shadow_copy2_mkdirat(vfs_handle_struct *handle,
2299                                 struct files_struct *dirfsp,
2300                                 const struct smb_filename *smb_fname,
2301                                 mode_t mode)
2302 {
2303         time_t timestamp = 0;
2304
2305         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2306                                         handle,
2307                                         smb_fname->base_name,
2308                                         &timestamp,
2309                                         NULL)) {
2310                 return -1;
2311         }
2312         if (timestamp != 0) {
2313                 errno = EROFS;
2314                 return -1;
2315         }
2316         return SMB_VFS_NEXT_MKDIRAT(handle,
2317                         dirfsp,
2318                         smb_fname,
2319                         mode);
2320 }
2321
2322 static int shadow_copy2_rmdir(vfs_handle_struct *handle,
2323                                 const struct smb_filename *smb_fname)
2324 {
2325         time_t timestamp = 0;
2326
2327         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2328                                         handle,
2329                                         smb_fname->base_name,
2330                                         &timestamp,
2331                                         NULL)) {
2332                 return -1;
2333         }
2334         if (timestamp != 0) {
2335                 errno = EROFS;
2336                 return -1;
2337         }
2338         return SMB_VFS_NEXT_RMDIR(handle, smb_fname);
2339 }
2340
2341 static int shadow_copy2_chflags(vfs_handle_struct *handle,
2342                                 const struct smb_filename *smb_fname,
2343                                 unsigned int flags)
2344 {
2345         time_t timestamp = 0;
2346
2347         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2348                                         handle,
2349                                         smb_fname->base_name,
2350                                         &timestamp,
2351                                         NULL)) {
2352                 return -1;
2353         }
2354         if (timestamp != 0) {
2355                 errno = EROFS;
2356                 return -1;
2357         }
2358         return SMB_VFS_NEXT_CHFLAGS(handle, smb_fname, flags);
2359 }
2360
2361 static ssize_t shadow_copy2_getxattr(vfs_handle_struct *handle,
2362                                 const struct smb_filename *smb_fname,
2363                                 const char *aname,
2364                                 void *value,
2365                                 size_t size)
2366 {
2367         time_t timestamp = 0;
2368         char *stripped = NULL;
2369         ssize_t ret;
2370         int saved_errno = 0;
2371         char *conv;
2372         struct smb_filename *conv_smb_fname = NULL;
2373
2374         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2375                                 handle,
2376                                 smb_fname->base_name,
2377                                 &timestamp,
2378                                 &stripped)) {
2379                 return -1;
2380         }
2381         if (timestamp == 0) {
2382                 return SMB_VFS_NEXT_GETXATTR(handle, smb_fname, aname, value,
2383                                              size);
2384         }
2385         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2386         TALLOC_FREE(stripped);
2387         if (conv == NULL) {
2388                 return -1;
2389         }
2390
2391         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2392                                         conv,
2393                                         NULL,
2394                                         NULL,
2395                                         smb_fname->flags);
2396         if (conv_smb_fname == NULL) {
2397                 TALLOC_FREE(conv);
2398                 return -1;
2399         }
2400
2401         ret = SMB_VFS_NEXT_GETXATTR(handle, conv_smb_fname, aname, value, size);
2402         if (ret == -1) {
2403                 saved_errno = errno;
2404         }
2405         TALLOC_FREE(conv_smb_fname);
2406         TALLOC_FREE(conv);
2407         if (saved_errno != 0) {
2408                 errno = saved_errno;
2409         }
2410         return ret;
2411 }
2412
2413 static ssize_t shadow_copy2_listxattr(struct vfs_handle_struct *handle,
2414                                       const struct smb_filename *smb_fname,
2415                                       char *list, size_t size)
2416 {
2417         time_t timestamp = 0;
2418         char *stripped = NULL;
2419         ssize_t ret;
2420         int saved_errno = 0;
2421         char *conv;
2422         struct smb_filename *conv_smb_fname = NULL;
2423
2424         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2425                                 handle,
2426                                 smb_fname->base_name,
2427                                 &timestamp,
2428                                 &stripped)) {
2429                 return -1;
2430         }
2431         if (timestamp == 0) {
2432                 return SMB_VFS_NEXT_LISTXATTR(handle, smb_fname, list, size);
2433         }
2434         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2435         TALLOC_FREE(stripped);
2436         if (conv == NULL) {
2437                 return -1;
2438         }
2439         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2440                                         conv,
2441                                         NULL,
2442                                         NULL,
2443                                         smb_fname->flags);
2444         if (conv_smb_fname == NULL) {
2445                 TALLOC_FREE(conv);
2446                 return -1;
2447         }
2448         ret = SMB_VFS_NEXT_LISTXATTR(handle, conv_smb_fname, list, size);
2449         if (ret == -1) {
2450                 saved_errno = errno;
2451         }
2452         TALLOC_FREE(conv_smb_fname);
2453         TALLOC_FREE(conv);
2454         if (saved_errno != 0) {
2455                 errno = saved_errno;
2456         }
2457         return ret;
2458 }
2459
2460 static int shadow_copy2_removexattr(vfs_handle_struct *handle,
2461                                 const struct smb_filename *smb_fname,
2462                                 const char *aname)
2463 {
2464         time_t timestamp = 0;
2465
2466         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2467                                 handle,
2468                                 smb_fname->base_name,
2469                                 &timestamp,
2470                                 NULL)) {
2471                 return -1;
2472         }
2473         if (timestamp != 0) {
2474                 errno = EROFS;
2475                 return -1;
2476         }
2477         return SMB_VFS_NEXT_REMOVEXATTR(handle, smb_fname, aname);
2478 }
2479
2480 static int shadow_copy2_setxattr(struct vfs_handle_struct *handle,
2481                                  const struct smb_filename *smb_fname,
2482                                  const char *aname, const void *value,
2483                                  size_t size, int flags)
2484 {
2485         time_t timestamp = 0;
2486
2487         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2488                                 handle,
2489                                 smb_fname->base_name,
2490                                 &timestamp,
2491                                 NULL)) {
2492                 return -1;
2493         }
2494         if (timestamp != 0) {
2495                 errno = EROFS;
2496                 return -1;
2497         }
2498         return SMB_VFS_NEXT_SETXATTR(handle, smb_fname,
2499                                 aname, value, size, flags);
2500 }
2501
2502 static int shadow_copy2_get_real_filename(struct vfs_handle_struct *handle,
2503                                           const char *path,
2504                                           const char *name,
2505                                           TALLOC_CTX *mem_ctx,
2506                                           char **found_name)
2507 {
2508         time_t timestamp = 0;
2509         char *stripped = NULL;
2510         ssize_t ret;
2511         int saved_errno = 0;
2512         char *conv;
2513
2514         DEBUG(10, ("shadow_copy2_get_real_filename called for path=[%s], "
2515                    "name=[%s]\n", path, name));
2516
2517         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, path,
2518                                          &timestamp, &stripped)) {
2519                 DEBUG(10, ("shadow_copy2_strip_snapshot failed\n"));
2520                 return -1;
2521         }
2522         if (timestamp == 0) {
2523                 DEBUG(10, ("timestamp == 0\n"));
2524                 return SMB_VFS_NEXT_GET_REAL_FILENAME(handle, path, name,
2525                                                       mem_ctx, found_name);
2526         }
2527         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2528         TALLOC_FREE(stripped);
2529         if (conv == NULL) {
2530                 DEBUG(10, ("shadow_copy2_convert failed\n"));
2531                 return -1;
2532         }
2533         DEBUG(10, ("Calling NEXT_GET_REAL_FILE_NAME for conv=[%s], "
2534                    "name=[%s]\n", conv, name));
2535         ret = SMB_VFS_NEXT_GET_REAL_FILENAME(handle, conv, name,
2536                                              mem_ctx, found_name);
2537         DEBUG(10, ("NEXT_REAL_FILE_NAME returned %d\n", (int)ret));
2538         if (ret == -1) {
2539                 saved_errno = errno;
2540         }
2541         TALLOC_FREE(conv);
2542         if (saved_errno != 0) {
2543                 errno = saved_errno;
2544         }
2545         return ret;
2546 }
2547
2548 static const char *shadow_copy2_connectpath(struct vfs_handle_struct *handle,
2549                                         const struct smb_filename *smb_fname_in)
2550 {
2551         time_t timestamp = 0;
2552         char *stripped = NULL;
2553         char *tmp = NULL;
2554         const char *fname = smb_fname_in->base_name;
2555         struct smb_filename smb_fname = {0};
2556         struct smb_filename *result_fname = NULL;
2557         char *result = NULL;
2558         char *parent_dir = NULL;
2559         int saved_errno = 0;
2560         size_t rootpath_len = 0;
2561         struct shadow_copy2_private *priv = NULL;
2562
2563         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
2564                                 return NULL);
2565
2566         DBG_DEBUG("Calc connect path for [%s]\n", fname);
2567
2568         if (priv->shadow_connectpath != NULL) {
2569                 DBG_DEBUG("cached connect path is [%s]\n",
2570                         priv->shadow_connectpath);
2571                 return priv->shadow_connectpath;
2572         }
2573
2574         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
2575                                          &timestamp, &stripped)) {
2576                 goto done;
2577         }
2578         if (timestamp == 0) {
2579                 return SMB_VFS_NEXT_CONNECTPATH(handle, smb_fname_in);
2580         }
2581
2582         tmp = shadow_copy2_do_convert(talloc_tos(), handle, stripped, timestamp,
2583                                       &rootpath_len);
2584         if (tmp == NULL) {
2585                 if (errno != ENOENT) {
2586                         goto done;
2587                 }
2588
2589                 /*
2590                  * If the converted path does not exist, and converting
2591                  * the parent yields something that does exist, then
2592                  * this path refers to something that has not been
2593                  * created yet, relative to the parent path.
2594                  * The snapshot finding is relative to the parent.
2595                  * (usually snapshots are read/only but this is not
2596                  * necessarily true).
2597                  * This code also covers getting a wildcard in the
2598                  * last component, because this function is called
2599                  * prior to sanitizing the path, and in SMB1 we may
2600                  * get wildcards in path names.
2601                  */
2602                 if (!parent_dirname(talloc_tos(), stripped, &parent_dir,
2603                                     NULL)) {
2604                         errno = ENOMEM;
2605                         goto done;
2606                 }
2607
2608                 tmp = shadow_copy2_do_convert(talloc_tos(), handle, parent_dir,
2609                                               timestamp, &rootpath_len);
2610                 if (tmp == NULL) {
2611                         goto done;
2612                 }
2613         }
2614
2615         DBG_DEBUG("converted path is [%s] root path is [%.*s]\n", tmp,
2616                   (int)rootpath_len, tmp);
2617
2618         tmp[rootpath_len] = '\0';
2619         smb_fname = (struct smb_filename) { .base_name = tmp };
2620
2621         result_fname = SMB_VFS_NEXT_REALPATH(handle, priv, &smb_fname);
2622         if (result_fname == NULL) {
2623                 goto done;
2624         }
2625
2626         /*
2627          * SMB_VFS_NEXT_REALPATH returns a talloc'ed string.
2628          * Don't leak memory.
2629          */
2630         TALLOC_FREE(priv->shadow_realpath);
2631         priv->shadow_realpath = result_fname;
2632         result = priv->shadow_realpath->base_name;
2633
2634         DBG_DEBUG("connect path is [%s]\n", result);
2635
2636 done:
2637         if (result == NULL) {
2638                 saved_errno = errno;
2639         }
2640         TALLOC_FREE(tmp);
2641         TALLOC_FREE(stripped);
2642         TALLOC_FREE(parent_dir);
2643         if (saved_errno != 0) {
2644                 errno = saved_errno;
2645         }
2646         return result;
2647 }
2648
2649 static uint64_t shadow_copy2_disk_free(vfs_handle_struct *handle,
2650                                 const struct smb_filename *smb_fname,
2651                                 uint64_t *bsize,
2652                                 uint64_t *dfree,
2653                                 uint64_t *dsize)
2654 {
2655         time_t timestamp = 0;
2656         char *stripped = NULL;
2657         int saved_errno = 0;
2658         char *conv = NULL;
2659         struct smb_filename *conv_smb_fname = NULL;
2660         uint64_t ret = (uint64_t)-1;
2661
2662         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2663                                 handle,
2664                                 smb_fname->base_name,
2665                                 &timestamp,
2666                                 &stripped)) {
2667                 return (uint64_t)-1;
2668         }
2669         if (timestamp == 0) {
2670                 return SMB_VFS_NEXT_DISK_FREE(handle, smb_fname,
2671                                               bsize, dfree, dsize);
2672         }
2673         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2674         TALLOC_FREE(stripped);
2675         if (conv == NULL) {
2676                 return (uint64_t)-1;
2677         }
2678         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2679                                         conv,
2680                                         NULL,
2681                                         NULL,
2682                                         smb_fname->flags);
2683         if (conv_smb_fname == NULL) {
2684                 TALLOC_FREE(conv);
2685                 return (uint64_t)-1;
2686         }
2687         ret = SMB_VFS_NEXT_DISK_FREE(handle, conv_smb_fname,
2688                                 bsize, dfree, dsize);
2689         if (ret == (uint64_t)-1) {
2690                 saved_errno = errno;
2691         }
2692         TALLOC_FREE(conv);
2693         TALLOC_FREE(conv_smb_fname);
2694         if (saved_errno != 0) {
2695                 errno = saved_errno;
2696         }
2697         return ret;
2698 }
2699
2700 static int shadow_copy2_get_quota(vfs_handle_struct *handle,
2701                                 const struct smb_filename *smb_fname,
2702                                 enum SMB_QUOTA_TYPE qtype,
2703                                 unid_t id,
2704                                 SMB_DISK_QUOTA *dq)
2705 {
2706         time_t timestamp = 0;
2707         char *stripped = NULL;
2708         int ret;
2709         int saved_errno = 0;
2710         char *conv;
2711         struct smb_filename *conv_smb_fname = NULL;
2712
2713         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2714                                 handle,
2715                                 smb_fname->base_name,
2716                                 &timestamp,
2717                                 &stripped)) {
2718                 return -1;
2719         }
2720         if (timestamp == 0) {
2721                 return SMB_VFS_NEXT_GET_QUOTA(handle, smb_fname, qtype, id, dq);
2722         }
2723
2724         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2725         TALLOC_FREE(stripped);
2726         if (conv == NULL) {
2727                 return -1;
2728         }
2729         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2730                                         conv,
2731                                         NULL,
2732                                         NULL,
2733                                         smb_fname->flags);
2734         if (conv_smb_fname == NULL) {
2735                 TALLOC_FREE(conv);
2736                 return -1;
2737         }
2738         ret = SMB_VFS_NEXT_GET_QUOTA(handle, conv_smb_fname, qtype, id, dq);
2739
2740         if (ret == -1) {
2741                 saved_errno = errno;
2742         }
2743         TALLOC_FREE(conv);
2744         TALLOC_FREE(conv_smb_fname);
2745         if (saved_errno != 0) {
2746                 errno = saved_errno;
2747         }
2748
2749         return ret;
2750 }
2751
2752 static ssize_t shadow_copy2_pwrite(vfs_handle_struct *handle,
2753                                    files_struct *fsp,
2754                                    const void *data,
2755                                    size_t n,
2756                                    off_t offset)
2757 {
2758         ssize_t nwritten;
2759
2760         nwritten = SMB_VFS_NEXT_PWRITE(handle, fsp, data, n, offset);
2761         if (nwritten == -1) {
2762                 if (errno == EBADF && fsp->can_write) {
2763                         errno = EROFS;
2764                 }
2765         }
2766
2767         return nwritten;
2768 }
2769
2770 struct shadow_copy2_pwrite_state {
2771         vfs_handle_struct *handle;
2772         files_struct *fsp;
2773         ssize_t ret;
2774         struct vfs_aio_state vfs_aio_state;
2775 };
2776
2777 static void shadow_copy2_pwrite_done(struct tevent_req *subreq);
2778
2779 static struct tevent_req *shadow_copy2_pwrite_send(
2780         struct vfs_handle_struct *handle, TALLOC_CTX *mem_ctx,
2781         struct tevent_context *ev, struct files_struct *fsp,
2782         const void *data, size_t n, off_t offset)
2783 {
2784         struct tevent_req *req = NULL, *subreq = NULL;
2785         struct shadow_copy2_pwrite_state *state = NULL;
2786
2787         req = tevent_req_create(mem_ctx, &state,
2788                                 struct shadow_copy2_pwrite_state);
2789         if (req == NULL) {
2790                 return NULL;
2791         }
2792         state->handle = handle;
2793         state->fsp = fsp;
2794
2795         subreq = SMB_VFS_NEXT_PWRITE_SEND(state,
2796                                           ev,
2797                                           handle,
2798                                           fsp,
2799                                           data,
2800                                           n,
2801                                           offset);
2802         if (tevent_req_nomem(subreq, req)) {
2803                 return tevent_req_post(req, ev);
2804         }
2805         tevent_req_set_callback(subreq, shadow_copy2_pwrite_done, req);
2806
2807         return req;
2808 }
2809
2810 static void shadow_copy2_pwrite_done(struct tevent_req *subreq)
2811 {
2812         struct tevent_req *req = tevent_req_callback_data(
2813                 subreq, struct tevent_req);
2814         struct shadow_copy2_pwrite_state *state = tevent_req_data(
2815                 req, struct shadow_copy2_pwrite_state);
2816
2817         state->ret = SMB_VFS_PWRITE_RECV(subreq, &state->vfs_aio_state);
2818         TALLOC_FREE(subreq);
2819         if (state->ret == -1) {
2820                 tevent_req_error(req, state->vfs_aio_state.error);
2821                 return;
2822         }
2823
2824         tevent_req_done(req);
2825 }
2826
2827 static ssize_t shadow_copy2_pwrite_recv(struct tevent_req *req,
2828                                           struct vfs_aio_state *vfs_aio_state)
2829 {
2830         struct shadow_copy2_pwrite_state *state = tevent_req_data(
2831                 req, struct shadow_copy2_pwrite_state);
2832
2833         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
2834                 if ((vfs_aio_state->error == EBADF) &&
2835                     state->fsp->can_write)
2836                 {
2837                         vfs_aio_state->error = EROFS;
2838                         errno = EROFS;
2839                 }
2840                 return -1;
2841         }
2842
2843         *vfs_aio_state = state->vfs_aio_state;
2844         return state->ret;
2845 }
2846
2847 static int shadow_copy2_connect(struct vfs_handle_struct *handle,
2848                                 const char *service, const char *user)
2849 {
2850         struct shadow_copy2_config *config;
2851         struct shadow_copy2_private *priv;
2852         int ret;
2853         const char *snapdir;
2854         const char *snapprefix = NULL;
2855         const char *delimiter;
2856         const char *gmt_format;
2857         const char *sort_order;
2858         const char *basedir = NULL;
2859         const char *snapsharepath = NULL;
2860         const char *mount_point;
2861
2862         DEBUG(10, (__location__ ": cnum[%u], connectpath[%s]\n",
2863                    (unsigned)handle->conn->cnum,
2864                    handle->conn->connectpath));
2865
2866         ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
2867         if (ret < 0) {
2868                 return ret;
2869         }
2870
2871         priv = talloc_zero(handle->conn, struct shadow_copy2_private);
2872         if (priv == NULL) {
2873                 DBG_ERR("talloc_zero() failed\n");
2874                 errno = ENOMEM;
2875                 return -1;
2876         }
2877
2878         priv->snaps = talloc_zero(priv, struct shadow_copy2_snaplist_info);
2879         if (priv->snaps == NULL) {
2880                 DBG_ERR("talloc_zero() failed\n");
2881                 errno = ENOMEM;
2882                 return -1;
2883         }
2884
2885         config = talloc_zero(priv, struct shadow_copy2_config);
2886         if (config == NULL) {
2887                 DEBUG(0, ("talloc_zero() failed\n"));
2888                 errno = ENOMEM;
2889                 return -1;
2890         }
2891
2892         priv->config = config;
2893
2894         gmt_format = lp_parm_const_string(SNUM(handle->conn),
2895                                           "shadow", "format",
2896                                           GMT_FORMAT);
2897         config->gmt_format = talloc_strdup(config, gmt_format);
2898         if (config->gmt_format == NULL) {
2899                 DEBUG(0, ("talloc_strdup() failed\n"));
2900                 errno = ENOMEM;
2901                 return -1;
2902         }
2903
2904         /* config->gmt_format must not contain a path separator. */
2905         if (strchr(config->gmt_format, '/') != NULL) {
2906                 DEBUG(0, ("shadow:format %s must not contain a /"
2907                         "character. Unable to initialize module.\n",
2908                         config->gmt_format));
2909                 errno = EINVAL;
2910                 return -1;
2911         }
2912
2913         config->use_sscanf = lp_parm_bool(SNUM(handle->conn),
2914                                           "shadow", "sscanf", false);
2915
2916         config->use_localtime = lp_parm_bool(SNUM(handle->conn),
2917                                              "shadow", "localtime",
2918                                              false);
2919
2920         snapdir = lp_parm_const_string(SNUM(handle->conn),
2921                                        "shadow", "snapdir",
2922                                        ".snapshots");
2923         config->snapdir = talloc_strdup(config, snapdir);
2924         if (config->snapdir == NULL) {
2925                 DEBUG(0, ("talloc_strdup() failed\n"));
2926                 errno = ENOMEM;
2927                 return -1;
2928         }
2929
2930         snapprefix = lp_parm_const_string(SNUM(handle->conn),
2931                                        "shadow", "snapprefix",
2932                                        NULL);
2933         if (snapprefix != NULL) {
2934                 priv->snaps->regex = talloc_zero(priv->snaps, regex_t);
2935                 if (priv->snaps->regex == NULL) {
2936                         DBG_ERR("talloc_zero() failed\n");
2937                         errno = ENOMEM;
2938                         return -1;
2939                 }
2940
2941                 /* pre-compute regex rule for matching pattern later */
2942                 ret = regcomp(priv->snaps->regex, snapprefix, 0);
2943                 if (ret) {
2944                         DBG_ERR("Failed to create regex object\n");
2945                         return -1;
2946                 }
2947         }
2948
2949         delimiter = lp_parm_const_string(SNUM(handle->conn),
2950                                        "shadow", "delimiter",
2951                                        "_GMT");
2952         if (delimiter != NULL) {
2953                 priv->config->delimiter = talloc_strdup(priv->config, delimiter);
2954                 if (priv->config->delimiter == NULL) {
2955                         DBG_ERR("talloc_strdup() failed\n");
2956                         errno = ENOMEM;
2957                         return -1;
2958                 }
2959         }
2960
2961         config->snapdirseverywhere = lp_parm_bool(SNUM(handle->conn),
2962                                                   "shadow",
2963                                                   "snapdirseverywhere",
2964                                                   false);
2965
2966         config->crossmountpoints = lp_parm_bool(SNUM(handle->conn),
2967                                                 "shadow", "crossmountpoints",
2968                                                 false);
2969
2970         if (config->crossmountpoints && !config->snapdirseverywhere) {
2971                 DBG_WARNING("Warning: 'crossmountpoints' depends on "
2972                             "'snapdirseverywhere'. Disabling crossmountpoints.\n");
2973         }
2974
2975         config->fixinodes = lp_parm_bool(SNUM(handle->conn),
2976                                          "shadow", "fixinodes",
2977                                          false);
2978
2979         sort_order = lp_parm_const_string(SNUM(handle->conn),
2980                                           "shadow", "sort", "desc");
2981         config->sort_order = talloc_strdup(config, sort_order);
2982         if (config->sort_order == NULL) {
2983                 DEBUG(0, ("talloc_strdup() failed\n"));
2984                 errno = ENOMEM;
2985                 return -1;
2986         }
2987
2988         mount_point = lp_parm_const_string(SNUM(handle->conn),
2989                                            "shadow", "mountpoint", NULL);
2990         if (mount_point != NULL) {
2991                 if (mount_point[0] != '/') {
2992                         DEBUG(1, (__location__ " Warning: 'mountpoint' is "
2993                                   "relative ('%s'), but it has to be an "
2994                                   "absolute path. Ignoring provided value.\n",
2995                                   mount_point));
2996                         mount_point = NULL;
2997                 } else {
2998                         char *p;
2999                         p = strstr(handle->conn->connectpath, mount_point);
3000                         if (p != handle->conn->connectpath) {
3001                                 DBG_WARNING("Warning: the share root (%s) is "
3002                                             "not a subdirectory of the "
3003                                             "specified mountpoint (%s). "
3004                                             "Ignoring provided value.\n",
3005                                             handle->conn->connectpath,
3006                                             mount_point);
3007                                 mount_point = NULL;
3008                         }
3009                 }
3010         }
3011
3012         if (mount_point != NULL) {
3013                 config->mount_point = talloc_strdup(config, mount_point);
3014                 if (config->mount_point == NULL) {
3015                         DEBUG(0, (__location__ " talloc_strdup() failed\n"));
3016                         return -1;
3017                 }
3018         } else {
3019                 config->mount_point = shadow_copy2_find_mount_point(config,
3020                                                                     handle);
3021                 if (config->mount_point == NULL) {
3022                         DBG_WARNING("shadow_copy2_find_mount_point "
3023                                     "of the share root '%s' failed: %s\n",
3024                                     handle->conn->connectpath, strerror(errno));
3025                         return -1;
3026                 }
3027         }
3028
3029         basedir = lp_parm_const_string(SNUM(handle->conn),
3030                                        "shadow", "basedir", NULL);
3031
3032         if (basedir != NULL) {
3033                 if (basedir[0] != '/') {
3034                         DEBUG(1, (__location__ " Warning: 'basedir' is "
3035                                   "relative ('%s'), but it has to be an "
3036                                   "absolute path. Disabling basedir.\n",
3037                                   basedir));
3038                         basedir = NULL;
3039                 } else {
3040                         char *p;
3041                         p = strstr(basedir, config->mount_point);
3042                         if (p != basedir) {
3043                                 DEBUG(1, ("Warning: basedir (%s) is not a "
3044                                           "subdirectory of the share root's "
3045                                           "mount point (%s). "
3046                                           "Disabling basedir\n",
3047                                           basedir, config->mount_point));
3048                                 basedir = NULL;
3049                         }
3050                 }
3051         }
3052
3053         if (config->snapdirseverywhere && basedir != NULL) {
3054                 DEBUG(1, (__location__ " Warning: 'basedir' is incompatible "
3055                           "with 'snapdirseverywhere'. Disabling basedir.\n"));
3056                 basedir = NULL;
3057         }
3058
3059         snapsharepath = lp_parm_const_string(SNUM(handle->conn), "shadow",
3060                                              "snapsharepath", NULL);
3061         if (snapsharepath != NULL) {
3062                 if (snapsharepath[0] == '/') {
3063                         DBG_WARNING("Warning: 'snapsharepath' is "
3064                                     "absolute ('%s'), but it has to be a "
3065                                     "relative path. Disabling snapsharepath.\n",
3066                                     snapsharepath);
3067                         snapsharepath = NULL;
3068                 }
3069                 if (config->snapdirseverywhere && snapsharepath != NULL) {
3070                         DBG_WARNING("Warning: 'snapsharepath' is incompatible "
3071                                     "with 'snapdirseverywhere'. Disabling "
3072                                     "snapsharepath.\n");
3073                         snapsharepath = NULL;
3074                 }
3075         }
3076
3077         if (basedir != NULL && snapsharepath != NULL) {
3078                 DBG_WARNING("Warning: 'snapsharepath' is incompatible with "
3079                             "'basedir'. Disabling snapsharepath\n");
3080                 snapsharepath = NULL;
3081         }
3082
3083         if (snapsharepath != NULL) {
3084                 config->rel_connectpath = talloc_strdup(config, snapsharepath);
3085                 if (config->rel_connectpath == NULL) {
3086                         DBG_ERR("talloc_strdup() failed\n");
3087                         errno = ENOMEM;
3088                         return -1;
3089                 }
3090         }
3091
3092         if (basedir == NULL) {
3093                 basedir = config->mount_point;
3094         }
3095
3096         if (config->rel_connectpath == NULL &&
3097             strlen(basedir) < strlen(handle->conn->connectpath)) {
3098                 config->rel_connectpath = talloc_strdup(config,
3099                         handle->conn->connectpath + strlen(basedir));
3100                 if (config->rel_connectpath == NULL) {
3101                         DEBUG(0, ("talloc_strdup() failed\n"));
3102                         errno = ENOMEM;
3103                         return -1;
3104                 }
3105         }
3106
3107         if (config->snapdir[0] == '/') {
3108                 config->snapdir_absolute = true;
3109
3110                 if (config->snapdirseverywhere == true) {
3111                         DEBUG(1, (__location__ " Warning: An absolute snapdir "
3112                                   "is incompatible with 'snapdirseverywhere', "
3113                                   "setting 'snapdirseverywhere' to false.\n"));
3114                         config->snapdirseverywhere = false;
3115                 }
3116
3117                 if (config->crossmountpoints == true) {
3118                         DEBUG(1, (__location__ " Warning: 'crossmountpoints' "
3119                                   "is not supported with an absolute snapdir. "
3120                                   "Disabling it.\n"));
3121                         config->crossmountpoints = false;
3122                 }
3123
3124                 config->snapshot_basepath = config->snapdir;
3125         } else {
3126                 config->snapshot_basepath = talloc_asprintf(config, "%s/%s",
3127                                 config->mount_point, config->snapdir);
3128                 if (config->snapshot_basepath == NULL) {
3129                         DEBUG(0, ("talloc_asprintf() failed\n"));
3130                         errno = ENOMEM;
3131                         return -1;
3132                 }
3133         }
3134
3135         trim_string(config->mount_point, NULL, "/");
3136         trim_string(config->rel_connectpath, "/", "/");
3137         trim_string(config->snapdir, NULL, "/");
3138         trim_string(config->snapshot_basepath, NULL, "/");
3139
3140         DEBUG(10, ("shadow_copy2_connect: configuration:\n"
3141                    "  share root: '%s'\n"
3142                    "  mountpoint: '%s'\n"
3143                    "  rel share root: '%s'\n"
3144                    "  snapdir: '%s'\n"
3145                    "  snapprefix: '%s'\n"
3146                    "  delimiter: '%s'\n"
3147                    "  snapshot base path: '%s'\n"
3148                    "  format: '%s'\n"
3149                    "  use sscanf: %s\n"
3150                    "  snapdirs everywhere: %s\n"
3151                    "  cross mountpoints: %s\n"
3152                    "  fix inodes: %s\n"
3153                    "  sort order: %s\n"
3154                    "",
3155                    handle->conn->connectpath,
3156                    config->mount_point,
3157                    config->rel_connectpath,
3158                    config->snapdir,
3159                    snapprefix,
3160                    config->delimiter,
3161                    config->snapshot_basepath,
3162                    config->gmt_format,
3163                    config->use_sscanf ? "yes" : "no",
3164                    config->snapdirseverywhere ? "yes" : "no",
3165                    config->crossmountpoints ? "yes" : "no",
3166                    config->fixinodes ? "yes" : "no",
3167                    config->sort_order
3168                    ));
3169
3170
3171         SMB_VFS_HANDLE_SET_DATA(handle, priv,
3172                                 NULL, struct shadow_copy2_private,
3173                                 return -1);
3174
3175         return 0;
3176 }
3177
3178 static struct vfs_fn_pointers vfs_shadow_copy2_fns = {
3179         .connect_fn = shadow_copy2_connect,
3180         .opendir_fn = shadow_copy2_opendir,
3181         .disk_free_fn = shadow_copy2_disk_free,
3182         .get_quota_fn = shadow_copy2_get_quota,
3183         .renameat_fn = shadow_copy2_renameat,
3184         .linkat_fn = shadow_copy2_linkat,
3185         .symlinkat_fn = shadow_copy2_symlinkat,
3186         .stat_fn = shadow_copy2_stat,
3187         .lstat_fn = shadow_copy2_lstat,
3188         .fstat_fn = shadow_copy2_fstat,
3189         .open_fn = shadow_copy2_open,
3190         .unlink_fn = shadow_copy2_unlink,
3191         .unlinkat_fn = shadow_copy2_unlinkat,
3192         .chmod_fn = shadow_copy2_chmod,
3193         .chown_fn = shadow_copy2_chown,
3194         .chdir_fn = shadow_copy2_chdir,
3195         .ntimes_fn = shadow_copy2_ntimes,
3196         .readlinkat_fn = shadow_copy2_readlinkat,
3197         .mknodat_fn = shadow_copy2_mknodat,
3198         .realpath_fn = shadow_copy2_realpath,
3199         .get_nt_acl_fn = shadow_copy2_get_nt_acl,
3200         .fget_nt_acl_fn = shadow_copy2_fget_nt_acl,
3201         .get_shadow_copy_data_fn = shadow_copy2_get_shadow_copy_data,
3202         .mkdirat_fn = shadow_copy2_mkdirat,
3203         .rmdir_fn = shadow_copy2_rmdir,
3204         .getxattr_fn = shadow_copy2_getxattr,
3205         .getxattrat_send_fn = vfs_not_implemented_getxattrat_send,
3206         .getxattrat_recv_fn = vfs_not_implemented_getxattrat_recv,
3207         .listxattr_fn = shadow_copy2_listxattr,
3208         .removexattr_fn = shadow_copy2_removexattr,
3209         .setxattr_fn = shadow_copy2_setxattr,
3210         .chflags_fn = shadow_copy2_chflags,
3211         .get_real_filename_fn = shadow_copy2_get_real_filename,
3212         .pwrite_fn = shadow_copy2_pwrite,
3213         .pwrite_send_fn = shadow_copy2_pwrite_send,
3214         .pwrite_recv_fn = shadow_copy2_pwrite_recv,
3215         .connectpath_fn = shadow_copy2_connectpath,
3216 };
3217
3218 static_decl_vfs;
3219 NTSTATUS vfs_shadow_copy2_init(TALLOC_CTX *ctx)
3220 {
3221         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION,
3222                                 "shadow_copy2", &vfs_shadow_copy2_fns);
3223 }