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 struct smb_filename *smb_fname,
 590                                         time_t *ptimestamp,
 591                                         char **pstripped,
 592                                         char **psnappath,
 593                                         bool *_already_converted,
 594                                         const char *function)
 595 {
 596         char *stripped = NULL;
 597         struct shadow_copy2_private *priv;
 598         char *abs_path = NULL;
 599         bool ret = true;
 600         bool already_converted = false;
 601         int err = 0;
 602
 603         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
 604                                 return false);
 605
 606         DBG_DEBUG("[from %s()] Path '%s'\n",
 607                   function, smb_fname_str_dbg(smb_fname));
 608
 609         if (_already_converted != NULL) {
 610                 *_already_converted = false;
 611         }
 612
 613         abs_path = make_path_absolute(mem_ctx, priv, smb_fname->base_name);
 614         if (abs_path == NULL) {
 615                 ret = false;
 616                 goto out;
 617         }
 618
 619         DBG_DEBUG("abs path '%s'\n", abs_path);
 620
 621         err = check_for_converted_path(mem_ctx,
 622                                         handle,
 623                                         priv,
 624                                         abs_path,
 625                                         &already_converted,
 626                                         psnappath);
 627         if (err != 0) {
 628                 /* error in conversion. */
 629                 ret = false;
 630                 goto out;
 631         }
 632
 633         if (already_converted) {
 634                 if (_already_converted != NULL) {
 635                         *_already_converted = true;
 636                 }
 637                 goto out;
 638         }
 639
 640         if (smb_fname->twrp == 0) {
 641                 goto out;
 642         }
 643
 644         if (ptimestamp != NULL) {
 645                 *ptimestamp = nt_time_to_unix(smb_fname->twrp);
 646         }
 647
 648         if (pstripped != NULL) {
 649                 stripped = talloc_strdup(mem_ctx, abs_path);
 650                 if (stripped == NULL) {
 651                         ret = false;
 652                         goto out;
 653                 }
 654
 655                 if (smb_fname->base_name[0] != '/') {
 656                         ret = make_relative_path(priv->shadow_cwd, stripped);
 657                         if (!ret) {
 658                                 DBG_DEBUG("Path '%s' "
 659                                         "doesn't start with cwd '%s'\n",
 660                                         stripped, priv->shadow_cwd);
 661                                 ret = false;
 662                                 errno = ENOENT;
 663                                 goto out;
 664                         }
 665                 }
 666                 *pstripped = stripped;
 667         }
 668
 669         ret = true;
 670
 671   out:
 672         TALLOC_FREE(abs_path);
 673         return ret;
 674 }
 675
 676 #define shadow_copy2_strip_snapshot_internal(mem_ctx, handle, orig_name, \
 677                 ptimestamp, pstripped, psnappath, _already_converted) \
 678         _shadow_copy2_strip_snapshot_internal((mem_ctx), (handle), (orig_name), \
 679                 (ptimestamp), (pstripped), (psnappath), (_already_converted), \
 680                                               __FUNCTION__)
 681
 682 static bool _shadow_copy2_strip_snapshot(TALLOC_CTX *mem_ctx,
 683                                          struct vfs_handle_struct *handle,
 684                                          const struct smb_filename *orig_name,
 685                                          time_t *ptimestamp,
 686                                          char **pstripped,
 687                                          const char *function)
 688 {
 689         return _shadow_copy2_strip_snapshot_internal(mem_ctx,
 690                                         handle,
 691                                         orig_name,
 692                                         ptimestamp,
 693                                         pstripped,
 694                                         NULL,
 695                                         NULL,
 696                                         function);
 697 }
 698
 699 #define shadow_copy2_strip_snapshot(mem_ctx, handle, orig_name, \
 700                 ptimestamp, pstripped) \
 701         _shadow_copy2_strip_snapshot((mem_ctx), (handle), (orig_name), \
 702                 (ptimestamp), (pstripped), __FUNCTION__)
 703
 704 static bool _shadow_copy2_strip_snapshot_converted(TALLOC_CTX *mem_ctx,
 705                                         struct vfs_handle_struct *handle,
 706                                         const struct smb_filename *orig_name,
 707                                         time_t *ptimestamp,
 708                                         char **pstripped,
 709                                         bool *is_converted,
 710                                         const char *function)
 711 {
 712         return _shadow_copy2_strip_snapshot_internal(mem_ctx,
 713                                         handle,
 714                                         orig_name,
 715                                         ptimestamp,
 716                                         pstripped,
 717                                         NULL,
 718                                         is_converted,
 719                                         function);
 720 }
 721
 722 #define shadow_copy2_strip_snapshot_converted(mem_ctx, handle, orig_name, \
 723                 ptimestamp, pstripped, is_converted) \
 724         _shadow_copy2_strip_snapshot_converted((mem_ctx), (handle), (orig_name), \
 725                 (ptimestamp), (pstripped), (is_converted), __FUNCTION__)
 726
 727 static char *shadow_copy2_find_mount_point(TALLOC_CTX *mem_ctx,
 728                                            vfs_handle_struct *handle)
 729 {
 730         char *path = talloc_strdup(mem_ctx, handle->conn->connectpath);
 731         dev_t dev;
 732         struct stat st;
 733         char *p;
 734
 735         if (stat(path, &st) != 0) {
 736                 talloc_free(path);
 737                 return NULL;
 738         }
 739
 740         dev = st.st_dev;
 741
 742         while ((p = strrchr(path, '/')) && p > path) {
 743                 *p = 0;
 744                 if (stat(path, &st) != 0) {
 745                         talloc_free(path);
 746                         return NULL;
 747                 }
 748                 if (st.st_dev != dev) {
 749                         *p = '/';
 750                         break;
 751                 }
 752         }
 753
 754         return path;
 755 }
 756
 757 /**
 758  * Convert from a name as handed in via the SMB layer
 759  * and a timestamp into the local path of the snapshot
 760  * of the provided file at the provided time.
 761  * Also return the path in the snapshot corresponding
 762  * to the file's share root.
 763  */
 764 static char *shadow_copy2_do_convert(TALLOC_CTX *mem_ctx,
 765                                      struct vfs_handle_struct *handle,
 766                                      const char *name, time_t timestamp,
 767                                      size_t *snaproot_len)
 768 {
 769         struct smb_filename converted_fname;
 770         char *result = NULL;
 771         size_t *slashes = NULL;
 772         unsigned num_slashes;
 773         char *path = NULL;
 774         size_t pathlen;
 775         char *insert = NULL;
 776         char *converted = NULL;
 777         size_t insertlen, connectlen = 0;
 778         int saved_errno = 0;
 779         int i;
 780         size_t min_offset;
 781         struct shadow_copy2_config *config;
 782         struct shadow_copy2_private *priv;
 783         size_t in_share_offset = 0;
 784
 785         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
 786                                 return NULL);
 787
 788         config = priv->config;
 789
 790         DEBUG(10, ("converting '%s'\n", name));
 791
 792         if (!config->snapdirseverywhere) {
 793                 int ret;
 794                 char *snapshot_path;
 795
 796                 snapshot_path = shadow_copy2_snapshot_path(talloc_tos(),
 797                                                            handle,
 798                                                            timestamp);
 799                 if (snapshot_path == NULL) {
 800                         goto fail;
 801                 }
 802
 803                 if (config->rel_connectpath == NULL) {
 804                         converted = talloc_asprintf(mem_ctx, "%s/%s",
 805                                                     snapshot_path, name);
 806                 } else {
 807                         converted = talloc_asprintf(mem_ctx, "%s/%s/%s",
 808                                                     snapshot_path,
 809                                                     config->rel_connectpath,
 810                                                     name);
 811                 }
 812                 if (converted == NULL) {
 813                         goto fail;
 814                 }
 815
 816                 ZERO_STRUCT(converted_fname);
 817                 converted_fname.base_name = converted;
 818
 819                 ret = SMB_VFS_NEXT_LSTAT(handle, &converted_fname);
 820                 DEBUG(10, ("Trying[not snapdirseverywhere] %s: %d (%s)\n",
 821                            converted,
 822                            ret, ret == 0 ? "ok" : strerror(errno)));
 823                 if (ret == 0) {
 824                         DEBUG(10, ("Found %s\n", converted));
 825                         result = converted;
 826                         converted = NULL;
 827                         if (snaproot_len != NULL) {
 828                                 *snaproot_len = strlen(snapshot_path);
 829                                 if (config->rel_connectpath != NULL) {
 830                                         *snaproot_len +=
 831                                             strlen(config->rel_connectpath) + 1;
 832                                 }
 833                         }
 834                         goto fail;
 835                 } else {
 836                         errno = ENOENT;
 837                         goto fail;
 838                 }
 839                 /* never reached ... */
 840         }
 841
 842         connectlen = strlen(handle->conn->connectpath);
 843         if (name[0] == 0) {
 844                 path = talloc_strdup(mem_ctx, handle->conn->connectpath);
 845         } else {
 846                 path = talloc_asprintf(
 847                         mem_ctx, "%s/%s", handle->conn->connectpath, name);
 848         }
 849         if (path == NULL) {
 850                 errno = ENOMEM;
 851                 goto fail;
 852         }
 853         pathlen = talloc_get_size(path)-1;
 854
 855         if (!shadow_copy2_find_slashes(talloc_tos(), path,
 856                                        &slashes, &num_slashes)) {
 857                 goto fail;
 858         }
 859
 860         insert = shadow_copy2_insert_string(talloc_tos(), handle, timestamp);
 861         if (insert == NULL) {
 862                 goto fail;
 863         }
 864         insertlen = talloc_get_size(insert)-1;
 865
 866         /*
 867          * Note: We deliberatly don't expensively initialize the
 868          * array with talloc_zero here: Putting zero into
 869          * converted[pathlen+insertlen] below is sufficient, because
 870          * in the following for loop, the insert string is inserted
 871          * at various slash places. So the memory up to position
 872          * pathlen+insertlen will always be initialized when the
 873          * converted string is used.
 874          */
 875         converted = talloc_array(mem_ctx, char, pathlen + insertlen + 1);
 876         if (converted == NULL) {
 877                 goto fail;
 878         }
 879
 880         if (path[pathlen-1] != '/') {
 881                 /*
 882                  * Append a fake slash to find the snapshot root
 883                  */
 884                 size_t *tmp;
 885                 tmp = talloc_realloc(talloc_tos(), slashes,
 886                                      size_t, num_slashes+1);
 887                 if (tmp == NULL) {
 888                         goto fail;
 889                 }
 890                 slashes = tmp;
 891                 slashes[num_slashes] = pathlen;
 892                 num_slashes += 1;
 893         }
 894
 895         min_offset = 0;
 896
 897         if (!config->crossmountpoints) {
 898                 min_offset = strlen(config->mount_point);
 899         }
 900
 901         memcpy(converted, path, pathlen+1);
 902         converted[pathlen+insertlen] = '\0';
 903
 904         ZERO_STRUCT(converted_fname);
 905         converted_fname.base_name = converted;
 906
 907         for (i = num_slashes-1; i>=0; i--) {
 908                 int ret;
 909                 size_t offset;
 910
 911                 offset = slashes[i];
 912
 913                 if (offset < min_offset) {
 914                         errno = ENOENT;
 915                         goto fail;
 916                 }
 917
 918                 if (offset >= connectlen) {
 919                         in_share_offset = offset;
 920                 }
 921
 922                 memcpy(converted+offset, insert, insertlen);
 923
 924                 offset += insertlen;
 925                 memcpy(converted+offset, path + slashes[i],
 926                        pathlen - slashes[i]);
 927
 928                 ret = SMB_VFS_NEXT_LSTAT(handle, &converted_fname);
 929
 930                 DEBUG(10, ("Trying[snapdirseverywhere] %s: %d (%s)\n",
 931                            converted,
 932                            ret, ret == 0 ? "ok" : strerror(errno)));
 933                 if (ret == 0) {
 934                         /* success */
 935                         if (snaproot_len != NULL) {
 936                                 *snaproot_len = in_share_offset + insertlen;
 937                         }
 938                         break;
 939                 }
 940                 if (errno == ENOTDIR) {
 941                         /*
 942                          * This is a valid condition: We appended the
 943                          * .snapshots/@GMT.. to a file name. Just try
 944                          * with the upper levels.
 945                          */
 946                         continue;
 947                 }
 948                 if (errno != ENOENT) {
 949                         /* Other problem than "not found" */
 950                         goto fail;
 951                 }
 952         }
 953
 954         if (i >= 0) {
 955                 /*
 956                  * Found something
 957                  */
 958                 DEBUG(10, ("Found %s\n", converted));
 959                 result = converted;
 960                 converted = NULL;
 961         } else {
 962                 errno = ENOENT;
 963         }
 964 fail:
 965         if (result == NULL) {
 966                 saved_errno = errno;
 967         }
 968         TALLOC_FREE(converted);
 969         TALLOC_FREE(insert);
 970         TALLOC_FREE(slashes);
 971         TALLOC_FREE(path);
 972         if (saved_errno != 0) {
 973                 errno = saved_errno;
 974         }
 975         return result;
 976 }
 977
 978 /**
 979  * Convert from a name as handed in via the SMB layer
 980  * and a timestamp into the local path of the snapshot
 981  * of the provided file at the provided time.
 982  */
 983 static char *shadow_copy2_convert(TALLOC_CTX *mem_ctx,
 984                                   struct vfs_handle_struct *handle,
 985                                   const char *name, time_t timestamp)
 986 {
 987         return shadow_copy2_do_convert(mem_ctx, handle, name, timestamp, NULL);
 988 }
 989
 990 /*
 991   modify a sbuf return to ensure that inodes in the shadow directory
 992   are different from those in the main directory
 993  */
 994 static void convert_sbuf(vfs_handle_struct *handle, const char *fname,
 995                          SMB_STRUCT_STAT *sbuf)
 996 {
 997         struct shadow_copy2_private *priv;
 998
 999         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1000                                 return);
1001
1002         if (priv->config->fixinodes) {
1003                 /* some snapshot systems, like GPFS, return the same
1004                    device:inode for the snapshot files as the current
1005                    files. That breaks the 'restore' button in the shadow copy
1006                    GUI, as the client gets a sharing violation.
1007
1008                    This is a crude way of allowing both files to be
1009                    open at once. It has a slight chance of inode
1010                    number collision, but I can't see a better approach
1011                    without significant VFS changes
1012                 */
1013                 TDB_DATA key = { .dptr = discard_const_p(uint8_t, fname),
1014                                  .dsize = strlen(fname) };
1015                 uint32_t shash;
1016
1017                 shash = tdb_jenkins_hash(&key) & 0xFF000000;
1018                 if (shash == 0) {
1019                         shash = 1;
1020                 }
1021                 sbuf->st_ex_ino ^= shash;
1022         }
1023 }
1024
1025 static int shadow_copy2_renameat(vfs_handle_struct *handle,
1026                                 files_struct *srcfsp,
1027                                 const struct smb_filename *smb_fname_src,
1028                                 files_struct *dstfsp,
1029                                 const struct smb_filename *smb_fname_dst)
1030 {
1031         time_t timestamp_src = 0;
1032         time_t timestamp_dst = 0;
1033         char *snappath_src = NULL;
1034         char *snappath_dst = NULL;
1035
1036         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(), handle,
1037                                          smb_fname_src,
1038                                          &timestamp_src, NULL, &snappath_src,
1039                                          NULL)) {
1040                 return -1;
1041         }
1042         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(), handle,
1043                                          smb_fname_dst,
1044                                          &timestamp_dst, NULL, &snappath_dst,
1045                                          NULL)) {
1046                 return -1;
1047         }
1048         if (timestamp_src != 0) {
1049                 errno = EXDEV;
1050                 return -1;
1051         }
1052         if (timestamp_dst != 0) {
1053                 errno = EROFS;
1054                 return -1;
1055         }
1056         /*
1057          * Don't allow rename on already converted paths.
1058          */
1059         if (snappath_src != NULL) {
1060                 errno = EXDEV;
1061                 return -1;
1062         }
1063         if (snappath_dst != NULL) {
1064                 errno = EROFS;
1065                 return -1;
1066         }
1067         return SMB_VFS_NEXT_RENAMEAT(handle,
1068                         srcfsp,
1069                         smb_fname_src,
1070                         dstfsp,
1071                         smb_fname_dst);
1072 }
1073
1074 static int shadow_copy2_symlinkat(vfs_handle_struct *handle,
1075                         const struct smb_filename *link_contents,
1076                         struct files_struct *dirfsp,
1077                         const struct smb_filename *new_smb_fname)
1078 {
1079         time_t timestamp_old = 0;
1080         time_t timestamp_new = 0;
1081         char *snappath_old = NULL;
1082         char *snappath_new = NULL;
1083
1084         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
1085                                 handle,
1086                                 link_contents,
1087                                 &timestamp_old,
1088                                 NULL,
1089                                 &snappath_old,
1090                                 NULL)) {
1091                 return -1;
1092         }
1093         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
1094                                 handle,
1095                                 new_smb_fname,
1096                                 &timestamp_new,
1097                                 NULL,
1098                                 &snappath_new,
1099                                 NULL)) {
1100                 return -1;
1101         }
1102         if ((timestamp_old != 0) || (timestamp_new != 0)) {
1103                 errno = EROFS;
1104                 return -1;
1105         }
1106         /*
1107          * Don't allow symlinks on already converted paths.
1108          */
1109         if ((snappath_old != NULL) || (snappath_new != NULL)) {
1110                 errno = EROFS;
1111                 return -1;
1112         }
1113         return SMB_VFS_NEXT_SYMLINKAT(handle,
1114                                 link_contents,
1115                                 dirfsp,
1116                                 new_smb_fname);
1117 }
1118
1119 static int shadow_copy2_linkat(vfs_handle_struct *handle,
1120                         files_struct *srcfsp,
1121                         const struct smb_filename *old_smb_fname,
1122                         files_struct *dstfsp,
1123                         const struct smb_filename *new_smb_fname,
1124                         int flags)
1125 {
1126         time_t timestamp_old = 0;
1127         time_t timestamp_new = 0;
1128         char *snappath_old = NULL;
1129         char *snappath_new = NULL;
1130
1131         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
1132                                 handle,
1133                                 old_smb_fname,
1134                                 &timestamp_old,
1135                                 NULL,
1136                                 &snappath_old,
1137                                 NULL)) {
1138                 return -1;
1139         }
1140         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
1141                                 handle,
1142                                 new_smb_fname,
1143                                 &timestamp_new,
1144                                 NULL,
1145                                 &snappath_new,
1146                                 NULL)) {
1147                 return -1;
1148         }
1149         if ((timestamp_old != 0) || (timestamp_new != 0)) {
1150                 errno = EROFS;
1151                 return -1;
1152         }
1153         /*
1154          * Don't allow links on already converted paths.
1155          */
1156         if ((snappath_old != NULL) || (snappath_new != NULL)) {
1157                 errno = EROFS;
1158                 return -1;
1159         }
1160         return SMB_VFS_NEXT_LINKAT(handle,
1161                         srcfsp,
1162                         old_smb_fname,
1163                         dstfsp,
1164                         new_smb_fname,
1165                         flags);
1166 }
1167
1168 static int shadow_copy2_stat(vfs_handle_struct *handle,
1169                              struct smb_filename *smb_fname)
1170 {
1171         time_t timestamp = 0;
1172         char *stripped = NULL;
1173         char *tmp;
1174         int saved_errno = 0;
1175         int ret;
1176
1177         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1178                                          smb_fname,
1179                                          &timestamp, &stripped)) {
1180                 return -1;
1181         }
1182         if (timestamp == 0) {
1183                 return SMB_VFS_NEXT_STAT(handle, smb_fname);
1184         }
1185
1186         tmp = smb_fname->base_name;
1187         smb_fname->base_name = shadow_copy2_convert(
1188                 talloc_tos(), handle, stripped, timestamp);
1189         TALLOC_FREE(stripped);
1190
1191         if (smb_fname->base_name == NULL) {
1192                 smb_fname->base_name = tmp;
1193                 return -1;
1194         }
1195
1196         ret = SMB_VFS_NEXT_STAT(handle, smb_fname);
1197         if (ret == -1) {
1198                 saved_errno = errno;
1199         }
1200
1201         TALLOC_FREE(smb_fname->base_name);
1202         smb_fname->base_name = tmp;
1203
1204         if (ret == 0) {
1205                 convert_sbuf(handle, smb_fname->base_name, &smb_fname->st);
1206         }
1207         if (saved_errno != 0) {
1208                 errno = saved_errno;
1209         }
1210         return ret;
1211 }
1212
1213 static int shadow_copy2_lstat(vfs_handle_struct *handle,
1214                               struct smb_filename *smb_fname)
1215 {
1216         time_t timestamp = 0;
1217         char *stripped = NULL;
1218         char *tmp;
1219         int saved_errno = 0;
1220         int ret;
1221
1222         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1223                                          smb_fname,
1224                                          &timestamp, &stripped)) {
1225                 return -1;
1226         }
1227         if (timestamp == 0) {
1228                 return SMB_VFS_NEXT_LSTAT(handle, smb_fname);
1229         }
1230
1231         tmp = smb_fname->base_name;
1232         smb_fname->base_name = shadow_copy2_convert(
1233                 talloc_tos(), handle, stripped, timestamp);
1234         TALLOC_FREE(stripped);
1235
1236         if (smb_fname->base_name == NULL) {
1237                 smb_fname->base_name = tmp;
1238                 return -1;
1239         }
1240
1241         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
1242         if (ret == -1) {
1243                 saved_errno = errno;
1244         }
1245
1246         TALLOC_FREE(smb_fname->base_name);
1247         smb_fname->base_name = tmp;
1248
1249         if (ret == 0) {
1250                 convert_sbuf(handle, smb_fname->base_name, &smb_fname->st);
1251         }
1252         if (saved_errno != 0) {
1253                 errno = saved_errno;
1254         }
1255         return ret;
1256 }
1257
1258 static int shadow_copy2_fstat(vfs_handle_struct *handle, files_struct *fsp,
1259                               SMB_STRUCT_STAT *sbuf)
1260 {
1261         time_t timestamp = 0;
1262         struct smb_filename *orig_smb_fname = NULL;
1263         struct smb_filename vss_smb_fname;
1264         struct smb_filename *orig_base_smb_fname = NULL;
1265         struct smb_filename vss_base_smb_fname;
1266         char *stripped = NULL;
1267         int saved_errno = 0;
1268         bool ok;
1269         int ret;
1270
1271         ok = shadow_copy2_strip_snapshot(talloc_tos(), handle,
1272                                          fsp->fsp_name,
1273                                          &timestamp, &stripped);
1274         if (!ok) {
1275                 return -1;
1276         }
1277
1278         if (timestamp == 0) {
1279                 TALLOC_FREE(stripped);
1280                 return SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
1281         }
1282
1283         vss_smb_fname = *fsp->fsp_name;
1284         vss_smb_fname.base_name = shadow_copy2_convert(talloc_tos(),
1285                                                        handle,
1286                                                        stripped,
1287                                                        timestamp);
1288         TALLOC_FREE(stripped);
1289         if (vss_smb_fname.base_name == NULL) {
1290                 return -1;
1291         }
1292
1293         orig_smb_fname = fsp->fsp_name;
1294         fsp->fsp_name = &vss_smb_fname;
1295
1296         if (fsp->base_fsp != NULL) {
1297                 vss_base_smb_fname = *fsp->base_fsp->fsp_name;
1298                 vss_base_smb_fname.base_name = vss_smb_fname.base_name;
1299                 orig_base_smb_fname = fsp->base_fsp->fsp_name;
1300                 fsp->base_fsp->fsp_name = &vss_base_smb_fname;
1301         }
1302
1303         ret = SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
1304         fsp->fsp_name = orig_smb_fname;
1305         if (fsp->base_fsp != NULL) {
1306                 fsp->base_fsp->fsp_name = orig_base_smb_fname;
1307         }
1308         if (ret == -1) {
1309                 saved_errno = errno;
1310         }
1311
1312         if (ret == 0) {
1313                 convert_sbuf(handle, fsp->fsp_name->base_name, sbuf);
1314         }
1315         if (saved_errno != 0) {
1316                 errno = saved_errno;
1317         }
1318         return ret;
1319 }
1320
1321 static int shadow_copy2_openat(vfs_handle_struct *handle,
1322                                const struct files_struct *dirfsp,
1323                                const struct smb_filename *smb_fname_in,
1324                                struct files_struct *fsp,
1325                                int flags,
1326                                mode_t mode)
1327 {
1328         struct smb_filename *smb_fname = NULL;
1329         time_t timestamp = 0;
1330         char *stripped = NULL;
1331         bool is_converted = false;
1332         int saved_errno = 0;
1333         int ret;
1334         bool ok;
1335
1336         smb_fname = full_path_from_dirfsp_atname(talloc_tos(),
1337                                                  dirfsp,
1338                                                  smb_fname_in);
1339         if (smb_fname == NULL) {
1340                 errno = ENOMEM;
1341                 return -1;
1342         }
1343
1344         ok = shadow_copy2_strip_snapshot_converted(talloc_tos(),
1345                                                    handle,
1346                                                    smb_fname,
1347                                                    &timestamp,
1348                                                    &stripped,
1349                                                    &is_converted);
1350         if (!ok) {
1351                 return -1;
1352         }
1353         if (timestamp == 0) {
1354                 if (is_converted) {
1355                         /*
1356                          * Just pave over the user requested mode and use
1357                          * O_RDONLY. Later attempts by the client to write on
1358                          * the handle will fail in the pwrite() syscall with
1359                          * EINVAL which we carefully map to EROFS. In sum, this
1360                          * matches Windows behaviour.
1361                          */
1362                         flags &= ~(O_WRONLY | O_RDWR | O_CREAT);
1363                 }
1364                 return SMB_VFS_NEXT_OPENAT(handle,
1365                                            dirfsp,
1366                                            smb_fname_in,
1367                                            fsp,
1368                                            flags,
1369                                            mode);
1370         }
1371
1372         smb_fname->base_name = shadow_copy2_convert(smb_fname,
1373                                                handle,
1374                                                stripped,
1375                                                timestamp);
1376         TALLOC_FREE(stripped);
1377         if (smb_fname->base_name == NULL) {
1378                 TALLOC_FREE(smb_fname);
1379                 errno = ENOMEM;
1380                 return -1;
1381         }
1382
1383         /*
1384          * Just pave over the user requested mode and use O_RDONLY. Later
1385          * attempts by the client to write on the handle will fail in the
1386          * pwrite() syscall with EINVAL which we carefully map to EROFS. In sum,
1387          * this matches Windows behaviour.
1388          */
1389         flags &= ~(O_WRONLY | O_RDWR | O_CREAT);
1390
1391         ret = SMB_VFS_NEXT_OPENAT(handle,
1392                                   dirfsp,
1393                                   smb_fname,
1394                                   fsp,
1395                                   flags,
1396                                   mode);
1397         if (ret == -1) {
1398                 saved_errno = errno;
1399         }
1400
1401         TALLOC_FREE(smb_fname);
1402
1403         if (saved_errno != 0) {
1404                 errno = saved_errno;
1405         }
1406         return ret;
1407 }
1408
1409 static int shadow_copy2_unlinkat(vfs_handle_struct *handle,
1410                         struct files_struct *dirfsp,
1411                         const struct smb_filename *smb_fname,
1412                         int flags)
1413 {
1414         time_t timestamp = 0;
1415
1416         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1417                                          smb_fname,
1418                                          &timestamp, NULL)) {
1419                 return -1;
1420         }
1421         if (timestamp != 0) {
1422                 errno = EROFS;
1423                 return -1;
1424         }
1425         return SMB_VFS_NEXT_UNLINKAT(handle,
1426                         dirfsp,
1427                         smb_fname,
1428                         flags);
1429 }
1430
1431 static int shadow_copy2_chmod(vfs_handle_struct *handle,
1432                         const struct smb_filename *smb_fname,
1433                         mode_t mode)
1434 {
1435         time_t timestamp = 0;
1436
1437         if (!shadow_copy2_strip_snapshot(talloc_tos(),
1438                                 handle,
1439                                 smb_fname,
1440                                 &timestamp,
1441                                 NULL)) {
1442                 return -1;
1443         }
1444         if (timestamp != 0) {
1445                 errno = EROFS;
1446                 return -1;
1447         }
1448         return SMB_VFS_NEXT_CHMOD(handle, smb_fname, mode);
1449 }
1450
1451 static int shadow_copy2_fchmod(vfs_handle_struct *handle,
1452                        struct files_struct *fsp,
1453                        mode_t mode)
1454 {
1455         time_t timestamp = 0;
1456         const struct smb_filename *smb_fname = NULL;
1457
1458         smb_fname = fsp->fsp_name;
1459         if (!shadow_copy2_strip_snapshot(talloc_tos(),
1460                                         handle,
1461                                         smb_fname,
1462                                         &timestamp,
1463                                         NULL)) {
1464                 return -1;
1465         }
1466         if (timestamp != 0) {
1467                 errno = EROFS;
1468                 return -1;
1469         }
1470         return SMB_VFS_NEXT_FCHMOD(handle, fsp, mode);
1471 }
1472
1473 static void store_cwd_data(vfs_handle_struct *handle,
1474                                 const char *connectpath)
1475 {
1476         struct shadow_copy2_private *priv = NULL;
1477         struct smb_filename *cwd_fname = NULL;
1478
1479         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1480                                 return);
1481
1482         TALLOC_FREE(priv->shadow_cwd);
1483         cwd_fname = SMB_VFS_NEXT_GETWD(handle, talloc_tos());
1484         if (cwd_fname == NULL) {
1485                 smb_panic("getwd failed\n");
1486         }
1487         DBG_DEBUG("shadow cwd = %s\n", cwd_fname->base_name);
1488         priv->shadow_cwd = talloc_strdup(priv, cwd_fname->base_name);
1489         TALLOC_FREE(cwd_fname);
1490         if (priv->shadow_cwd == NULL) {
1491                 smb_panic("talloc failed\n");
1492         }
1493         TALLOC_FREE(priv->shadow_connectpath);
1494         if (connectpath) {
1495                 DBG_DEBUG("shadow connectpath = %s\n", connectpath);
1496                 priv->shadow_connectpath = talloc_strdup(priv, connectpath);
1497                 if (priv->shadow_connectpath == NULL) {
1498                         smb_panic("talloc failed\n");
1499                 }
1500         }
1501 }
1502
1503 static int shadow_copy2_chdir(vfs_handle_struct *handle,
1504                                const struct smb_filename *smb_fname)
1505 {
1506         time_t timestamp = 0;
1507         char *stripped = NULL;
1508         char *snappath = NULL;
1509         int ret = -1;
1510         int saved_errno = 0;
1511         char *conv = NULL;
1512         size_t rootpath_len = 0;
1513         struct smb_filename *conv_smb_fname = NULL;
1514
1515         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
1516                                         handle,
1517                                         smb_fname,
1518                                         &timestamp,
1519                                         &stripped,
1520                                         &snappath,
1521                                         NULL)) {
1522                 return -1;
1523         }
1524         if (stripped != NULL) {
1525                 conv = shadow_copy2_do_convert(talloc_tos(),
1526                                                 handle,
1527                                                 stripped,
1528                                                 timestamp,
1529                                                 &rootpath_len);
1530                 TALLOC_FREE(stripped);
1531                 if (conv == NULL) {
1532                         return -1;
1533                 }
1534                 conv_smb_fname = synthetic_smb_fname(talloc_tos(),
1535                                         conv,
1536                                         NULL,
1537                                         NULL,
1538                                         0,
1539                                         smb_fname->flags);
1540         } else {
1541                 conv_smb_fname = cp_smb_filename(talloc_tos(), smb_fname);
1542         }
1543
1544         if (conv_smb_fname == NULL) {
1545                 TALLOC_FREE(conv);
1546                 errno = ENOMEM;
1547                 return -1;
1548         }
1549
1550         ret = SMB_VFS_NEXT_CHDIR(handle, conv_smb_fname);
1551         if (ret == -1) {
1552                 saved_errno = errno;
1553         }
1554
1555         if (ret == 0) {
1556                 if (conv != NULL && rootpath_len != 0) {
1557                         conv[rootpath_len] = '\0';
1558                 } else if (snappath != 0) {
1559                         TALLOC_FREE(conv);
1560                         conv = snappath;
1561                 }
1562                 store_cwd_data(handle, conv);
1563         }
1564
1565         TALLOC_FREE(stripped);
1566         TALLOC_FREE(conv);
1567         TALLOC_FREE(conv_smb_fname);
1568
1569         if (saved_errno != 0) {
1570                 errno = saved_errno;
1571         }
1572         return ret;
1573 }
1574
1575 static int shadow_copy2_ntimes(vfs_handle_struct *handle,
1576                                const struct smb_filename *smb_fname,
1577                                struct smb_file_time *ft)
1578 {
1579         time_t timestamp = 0;
1580
1581         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1582                                          smb_fname,
1583                                          &timestamp, NULL)) {
1584                 return -1;
1585         }
1586         if (timestamp != 0) {
1587                 errno = EROFS;
1588                 return -1;
1589         }
1590         return SMB_VFS_NEXT_NTIMES(handle, smb_fname, ft);
1591 }
1592
1593 static int shadow_copy2_readlinkat(vfs_handle_struct *handle,
1594                                 const struct files_struct *dirfsp,
1595                                 const struct smb_filename *smb_fname,
1596                                 char *buf,
1597                                 size_t bufsiz)
1598 {
1599         time_t timestamp = 0;
1600         char *stripped = NULL;
1601         int saved_errno = 0;
1602         int ret;
1603         struct smb_filename *full_fname = NULL;
1604         struct smb_filename *conv = NULL;
1605
1606         full_fname = full_path_from_dirfsp_atname(talloc_tos(),
1607                                                   dirfsp,
1608                                                   smb_fname);
1609         if (full_fname == NULL) {
1610                 errno = ENOMEM;
1611                 return -1;
1612         }
1613
1614         if (!shadow_copy2_strip_snapshot(talloc_tos(),
1615                                         handle,
1616                                         full_fname,
1617                                         &timestamp,
1618                                         &stripped)) {
1619                 TALLOC_FREE(full_fname);
1620                 return -1;
1621         }
1622
1623         if (timestamp == 0) {
1624                 TALLOC_FREE(full_fname);
1625                 TALLOC_FREE(stripped);
1626                 return SMB_VFS_NEXT_READLINKAT(handle,
1627                                 dirfsp,
1628                                 smb_fname,
1629                                 buf,
1630                                 bufsiz);
1631         }
1632         conv = cp_smb_filename(talloc_tos(), full_fname);
1633         if (conv == NULL) {
1634                 TALLOC_FREE(full_fname);
1635                 TALLOC_FREE(stripped);
1636                 errno = ENOMEM;
1637                 return -1;
1638         }
1639         TALLOC_FREE(full_fname);
1640         conv->base_name = shadow_copy2_convert(
1641                 conv, handle, stripped, timestamp);
1642         TALLOC_FREE(stripped);
1643         if (conv->base_name == NULL) {
1644                 return -1;
1645         }
1646         ret = SMB_VFS_NEXT_READLINKAT(handle,
1647                                 handle->conn->cwd_fsp,
1648                                 conv,
1649                                 buf,
1650                                 bufsiz);
1651         if (ret == -1) {
1652                 saved_errno = errno;
1653         }
1654         TALLOC_FREE(conv);
1655         if (saved_errno != 0) {
1656                 errno = saved_errno;
1657         }
1658         return ret;
1659 }
1660
1661 static int shadow_copy2_mknodat(vfs_handle_struct *handle,
1662                         files_struct *dirfsp,
1663                         const struct smb_filename *smb_fname,
1664                         mode_t mode,
1665                         SMB_DEV_T dev)
1666 {
1667         time_t timestamp = 0;
1668
1669         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1670                                          smb_fname,
1671                                          &timestamp, NULL)) {
1672                 return -1;
1673         }
1674         if (timestamp != 0) {
1675                 errno = EROFS;
1676                 return -1;
1677         }
1678         return SMB_VFS_NEXT_MKNODAT(handle,
1679                         dirfsp,
1680                         smb_fname,
1681                         mode,
1682                         dev);
1683 }
1684
1685 static struct smb_filename *shadow_copy2_realpath(vfs_handle_struct *handle,
1686                                 TALLOC_CTX *ctx,
1687                                 const struct smb_filename *smb_fname)
1688 {
1689         time_t timestamp = 0;
1690         char *stripped = NULL;
1691         struct smb_filename *result_fname = NULL;
1692         struct smb_filename *conv_fname = NULL;
1693         int saved_errno = 0;
1694
1695         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1696                                 smb_fname,
1697                                 &timestamp, &stripped)) {
1698                 goto done;
1699         }
1700         if (timestamp == 0) {
1701                 return SMB_VFS_NEXT_REALPATH(handle, ctx, smb_fname);
1702         }
1703
1704         conv_fname = cp_smb_filename(talloc_tos(), smb_fname);
1705         if (conv_fname == NULL) {
1706                 goto done;
1707         }
1708         conv_fname->base_name = shadow_copy2_convert(
1709                 conv_fname, handle, stripped, timestamp);
1710         if (conv_fname->base_name == NULL) {
1711                 goto done;
1712         }
1713
1714         result_fname = SMB_VFS_NEXT_REALPATH(handle, ctx, conv_fname);
1715
1716 done:
1717         if (result_fname == NULL) {
1718                 saved_errno = errno;
1719         }
1720         TALLOC_FREE(conv_fname);
1721         TALLOC_FREE(stripped);
1722         if (saved_errno != 0) {
1723                 errno = saved_errno;
1724         }
1725         return result_fname;
1726 }
1727
1728 /**
1729  * Check whether a given directory contains a
1730  * snapshot directory as direct subdirectory.
1731  * If yes, return the path of the snapshot-subdir,
1732  * otherwise return NULL.
1733  */
1734 static char *have_snapdir(struct vfs_handle_struct *handle,
1735                           const char *path)
1736 {
1737         struct smb_filename smb_fname;
1738         int ret;
1739         struct shadow_copy2_private *priv;
1740
1741         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1742                                 return NULL);
1743
1744         ZERO_STRUCT(smb_fname);
1745         smb_fname.base_name = talloc_asprintf(talloc_tos(), "%s/%s",
1746                                               path, priv->config->snapdir);
1747         if (smb_fname.base_name == NULL) {
1748                 return NULL;
1749         }
1750
1751         ret = SMB_VFS_NEXT_STAT(handle, &smb_fname);
1752         if ((ret == 0) && (S_ISDIR(smb_fname.st.st_ex_mode))) {
1753                 return smb_fname.base_name;
1754         }
1755         TALLOC_FREE(smb_fname.base_name);
1756         return NULL;
1757 }
1758
1759 static bool check_access_snapdir(struct vfs_handle_struct *handle,
1760                                 const char *path)
1761 {
1762         struct smb_filename smb_fname;
1763         int ret;
1764         NTSTATUS status;
1765
1766         ZERO_STRUCT(smb_fname);
1767         smb_fname.base_name = talloc_asprintf(talloc_tos(),
1768                                                 "%s",
1769                                                 path);
1770         if (smb_fname.base_name == NULL) {
1771                 return false;
1772         }
1773
1774         ret = SMB_VFS_NEXT_STAT(handle, &smb_fname);
1775         if (ret != 0 || !S_ISDIR(smb_fname.st.st_ex_mode)) {
1776                 TALLOC_FREE(smb_fname.base_name);
1777                 return false;
1778         }
1779
1780         status = smbd_check_access_rights(handle->conn,
1781                                         handle->conn->cwd_fsp,
1782                                         &smb_fname,
1783                                         false,
1784                                         SEC_DIR_LIST);
1785         if (!NT_STATUS_IS_OK(status)) {
1786                 DEBUG(0,("user does not have list permission "
1787                         "on snapdir %s\n",
1788                         smb_fname.base_name));
1789                 TALLOC_FREE(smb_fname.base_name);
1790                 return false;
1791         }
1792         TALLOC_FREE(smb_fname.base_name);
1793         return true;
1794 }
1795
1796 /**
1797  * Find the snapshot directory (if any) for the given
1798  * filename (which is relative to the share).
1799  */
1800 static const char *shadow_copy2_find_snapdir(TALLOC_CTX *mem_ctx,
1801                                              struct vfs_handle_struct *handle,
1802                                              struct smb_filename *smb_fname)
1803 {
1804         char *path, *p;
1805         const char *snapdir;
1806         struct shadow_copy2_config *config;
1807         struct shadow_copy2_private *priv;
1808
1809         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1810                                 return NULL);
1811
1812         config = priv->config;
1813
1814         /*
1815          * If the non-snapdisrseverywhere mode, we should not search!
1816          */
1817         if (!config->snapdirseverywhere) {
1818                 return config->snapshot_basepath;
1819         }
1820
1821         path = talloc_asprintf(mem_ctx, "%s/%s",
1822                                handle->conn->connectpath,
1823                                smb_fname->base_name);
1824         if (path == NULL) {
1825                 return NULL;
1826         }
1827
1828         snapdir = have_snapdir(handle, path);
1829         if (snapdir != NULL) {
1830                 TALLOC_FREE(path);
1831                 return snapdir;
1832         }
1833
1834         while ((p = strrchr(path, '/')) && (p > path)) {
1835
1836                 p[0] = '\0';
1837
1838                 snapdir = have_snapdir(handle, path);
1839                 if (snapdir != NULL) {
1840                         TALLOC_FREE(path);
1841                         return snapdir;
1842                 }
1843         }
1844         TALLOC_FREE(path);
1845         return NULL;
1846 }
1847
1848 static bool shadow_copy2_snapshot_to_gmt(vfs_handle_struct *handle,
1849                                          const char *name,
1850                                          char *gmt, size_t gmt_len)
1851 {
1852         struct tm timestamp;
1853         time_t timestamp_t;
1854         unsigned long int timestamp_long;
1855         const char *fmt;
1856         struct shadow_copy2_config *config;
1857         struct shadow_copy2_private *priv;
1858         char *tmpstr = NULL;
1859         char *tmp = NULL;
1860         bool converted = false;
1861         int ret = -1;
1862
1863         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1864                                 return NULL);
1865
1866         config = priv->config;
1867
1868         fmt = config->gmt_format;
1869
1870         /*
1871          * If regex is provided, then we will have to parse the
1872          * filename which will contain both the prefix and the time format.
1873          * e.g. <prefix><delimiter><time_format>
1874          */
1875         if (priv->snaps->regex != NULL) {
1876                 tmpstr = talloc_strdup(talloc_tos(), name);
1877                 /* point "name" to the time format */
1878                 name = strstr(name, priv->config->delimiter);
1879                 if (name == NULL) {
1880                         goto done;
1881                 }
1882                 /* Extract the prefix */
1883                 tmp = strstr(tmpstr, priv->config->delimiter);
1884                 if (tmp == NULL) {
1885                         goto done;
1886                 }
1887                 *tmp = '\0';
1888
1889                 /* Parse regex */
1890                 ret = regexec(priv->snaps->regex, tmpstr, 0, NULL, 0);
1891                 if (ret) {
1892                         DBG_DEBUG("shadow_copy2_snapshot_to_gmt: "
1893                                   "no regex match for %s\n", tmpstr);
1894                         goto done;
1895                 }
1896         }
1897
1898         ZERO_STRUCT(timestamp);
1899         if (config->use_sscanf) {
1900                 if (sscanf(name, fmt, &timestamp_long) != 1) {
1901                         DEBUG(10, ("shadow_copy2_snapshot_to_gmt: "
1902                                    "no sscanf match %s: %s\n",
1903                                    fmt, name));
1904                         goto done;
1905                 }
1906                 timestamp_t = timestamp_long;
1907                 gmtime_r(&timestamp_t, &timestamp);
1908         } else {
1909                 if (strptime(name, fmt, &timestamp) == NULL) {
1910                         DEBUG(10, ("shadow_copy2_snapshot_to_gmt: "
1911                                    "no match %s: %s\n",
1912                                    fmt, name));
1913                         goto done;
1914                 }
1915                 DEBUG(10, ("shadow_copy2_snapshot_to_gmt: match %s: %s\n",
1916                            fmt, name));
1917
1918                 if (config->use_localtime) {
1919                         timestamp.tm_isdst = -1;
1920                         timestamp_t = mktime(&timestamp);
1921                         gmtime_r(&timestamp_t, &timestamp);
1922                 }
1923         }
1924
1925         strftime(gmt, gmt_len, GMT_FORMAT, &timestamp);
1926         converted = true;
1927
1928 done:
1929         TALLOC_FREE(tmpstr);
1930         return converted;
1931 }
1932
1933 static int shadow_copy2_label_cmp_asc(const void *x, const void *y)
1934 {
1935         return strncmp((const char *)x, (const char *)y, sizeof(SHADOW_COPY_LABEL));
1936 }
1937
1938 static int shadow_copy2_label_cmp_desc(const void *x, const void *y)
1939 {
1940         return -strncmp((const char *)x, (const char *)y, sizeof(SHADOW_COPY_LABEL));
1941 }
1942
1943 /*
1944   sort the shadow copy data in ascending or descending order
1945  */
1946 static void shadow_copy2_sort_data(vfs_handle_struct *handle,
1947                                    struct shadow_copy_data *shadow_copy2_data)
1948 {
1949         int (*cmpfunc)(const void *, const void *);
1950         const char *sort;
1951         struct shadow_copy2_private *priv;
1952
1953         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1954                                 return);
1955
1956         sort = priv->config->sort_order;
1957         if (sort == NULL) {
1958                 return;
1959         }
1960
1961         if (strcmp(sort, "asc") == 0) {
1962                 cmpfunc = shadow_copy2_label_cmp_asc;
1963         } else if (strcmp(sort, "desc") == 0) {
1964                 cmpfunc = shadow_copy2_label_cmp_desc;
1965         } else {
1966                 return;
1967         }
1968
1969         if (shadow_copy2_data && shadow_copy2_data->num_volumes > 0 &&
1970             shadow_copy2_data->labels)
1971         {
1972                 TYPESAFE_QSORT(shadow_copy2_data->labels,
1973                                shadow_copy2_data->num_volumes,
1974                                cmpfunc);
1975         }
1976 }
1977
1978 static int shadow_copy2_get_shadow_copy_data(
1979         vfs_handle_struct *handle, files_struct *fsp,
1980         struct shadow_copy_data *shadow_copy2_data,
1981         bool labels)
1982 {
1983         DIR *p = NULL;
1984         const char *snapdir;
1985         struct smb_filename *snapdir_smb_fname = NULL;
1986         struct files_struct *dirfsp = NULL;
1987         struct files_struct *fspcwd = NULL;
1988         struct dirent *d;
1989         TALLOC_CTX *tmp_ctx = talloc_stackframe();
1990         struct shadow_copy2_private *priv = NULL;
1991         struct shadow_copy2_snapentry *tmpentry = NULL;
1992         bool get_snaplist = false;
1993         bool access_granted = false;
1994         int open_flags = O_RDONLY;
1995         int fd;
1996         int ret = -1;
1997         NTSTATUS status;
1998
1999         snapdir = shadow_copy2_find_snapdir(tmp_ctx, handle, fsp->fsp_name);
2000         if (snapdir == NULL) {
2001                 DEBUG(0,("shadow:snapdir not found for %s in get_shadow_copy_data\n",
2002                          handle->conn->connectpath));
2003                 errno = EINVAL;
2004                 goto done;
2005         }
2006
2007         access_granted = check_access_snapdir(handle, snapdir);
2008         if (!access_granted) {
2009                 DEBUG(0,("access denied on listing snapdir %s\n", snapdir));
2010                 errno = EACCES;
2011                 goto done;
2012         }
2013
2014         snapdir_smb_fname = synthetic_smb_fname(talloc_tos(),
2015                                         snapdir,
2016                                         NULL,
2017                                         NULL,
2018                                         0,
2019                                         fsp->fsp_name->flags);
2020         if (snapdir_smb_fname == NULL) {
2021                 errno = ENOMEM;
2022                 goto done;
2023         }
2024
2025         status = create_internal_dirfsp(handle->conn,
2026                                         snapdir_smb_fname,
2027                                         &dirfsp);
2028         if (!NT_STATUS_IS_OK(status)) {
2029                 DBG_WARNING("create_internal_dir_fsp() failed for '%s'"
2030                             " - %s\n", snapdir, nt_errstr(status));
2031                 errno = ENOSYS;
2032                 goto done;
2033         }
2034
2035         status = vfs_at_fspcwd(talloc_tos(), handle->conn, &fspcwd);
2036         if (!NT_STATUS_IS_OK(status)) {
2037                 errno = ENOMEM;
2038                 goto done;
2039         }
2040
2041 #ifdef O_DIRECTORY
2042         open_flags |= O_DIRECTORY;
2043 #endif
2044
2045         fd = SMB_VFS_NEXT_OPENAT(handle,
2046                                  fspcwd,
2047                                  snapdir_smb_fname,
2048                                  dirfsp,
2049                                  open_flags,
2050                                  0);
2051         if (fd == -1) {
2052                 DBG_WARNING("SMB_VFS_NEXT_OPEN failed for '%s'"
2053                             " - %s\n", snapdir, strerror(errno));
2054                 errno = ENOSYS;
2055                 goto done;
2056         }
2057         fsp_set_fd(dirfsp, fd);
2058
2059         p = SMB_VFS_NEXT_FDOPENDIR(handle, dirfsp, NULL, 0);
2060         if (!p) {
2061                 DBG_NOTICE("shadow_copy2: SMB_VFS_NEXT_FDOPENDIR() failed for '%s'"
2062                            " - %s\n", snapdir, strerror(errno));
2063                 errno = ENOSYS;
2064                 goto done;
2065         }
2066
2067         if (shadow_copy2_data != NULL) {
2068                 shadow_copy2_data->num_volumes = 0;
2069                 shadow_copy2_data->labels      = NULL;
2070         }
2071
2072         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
2073                                 goto done);
2074
2075         /*
2076          * Normally this function is called twice once with labels = false and
2077          * then with labels = true. When labels is false it will return the
2078          * number of volumes so that the caller can allocate memory for that
2079          * many labels. Therefore to eliminate snaplist both the times it is
2080          * good to check if labels is set or not.
2081          *
2082          * shadow_copy2_data is NULL when we only want to update the list and
2083          * don't want any labels.
2084          */
2085         if ((priv->snaps->regex != NULL) && (labels || shadow_copy2_data == NULL)) {
2086                 get_snaplist = true;
2087                 /* Reset the global snaplist */
2088                 shadow_copy2_delete_snaplist(priv);
2089
2090                 /* Set the current time as snaplist update time */
2091                 time(&(priv->snaps->fetch_time));
2092         }
2093
2094         while ((d = SMB_VFS_NEXT_READDIR(handle, dirfsp, p, NULL))) {
2095                 char snapshot[GMT_NAME_LEN+1];
2096                 SHADOW_COPY_LABEL *tlabels;
2097
2098                 /*
2099                  * ignore names not of the right form in the snapshot
2100                  * directory
2101                  */
2102                 if (!shadow_copy2_snapshot_to_gmt(
2103                             handle, d->d_name,
2104                             snapshot, sizeof(snapshot))) {
2105
2106                         DEBUG(6, ("shadow_copy2_get_shadow_copy_data: "
2107                                   "ignoring %s\n", d->d_name));
2108                         continue;
2109                 }
2110                 DEBUG(6,("shadow_copy2_get_shadow_copy_data: %s -> %s\n",
2111                          d->d_name, snapshot));
2112
2113                 if (get_snaplist) {
2114                         /*
2115                          * Create a snap entry for each successful
2116                          * pattern match.
2117                          */
2118                         tmpentry = shadow_copy2_create_snapentry(priv);
2119                         if (tmpentry == NULL) {
2120                                 DBG_ERR("talloc_zero() failed\n");
2121                                 goto done;
2122                         }
2123                         tmpentry->snapname = talloc_strdup(tmpentry, d->d_name);
2124                         tmpentry->time_fmt = talloc_strdup(tmpentry, snapshot);
2125                 }
2126
2127                 if (shadow_copy2_data == NULL) {
2128                         continue;
2129                 }
2130
2131                 if (!labels) {
2132                         /* the caller doesn't want the labels */
2133                         shadow_copy2_data->num_volumes++;
2134                         continue;
2135                 }
2136
2137                 tlabels = talloc_realloc(shadow_copy2_data,
2138                                          shadow_copy2_data->labels,
2139                                          SHADOW_COPY_LABEL,
2140                                          shadow_copy2_data->num_volumes+1);
2141                 if (tlabels == NULL) {
2142                         DEBUG(0,("shadow_copy2: out of memory\n"));
2143                         goto done;
2144                 }
2145
2146                 strlcpy(tlabels[shadow_copy2_data->num_volumes], snapshot,
2147                         sizeof(*tlabels));
2148
2149                 shadow_copy2_data->num_volumes++;
2150                 shadow_copy2_data->labels = tlabels;
2151         }
2152
2153         shadow_copy2_sort_data(handle, shadow_copy2_data);
2154         ret = 0;
2155
2156 done:
2157         TALLOC_FREE(fspcwd );
2158         if (p != NULL) {
2159                 SMB_VFS_NEXT_CLOSEDIR(handle, p);
2160                 p = NULL;
2161                 if (dirfsp != NULL) {
2162                         /*
2163                          * VFS_CLOSEDIR implicitly
2164                          * closed the associated fd.
2165                          */
2166                         fsp_set_fd(dirfsp, -1);
2167                 }
2168         }
2169         if (dirfsp != NULL) {
2170                 fd_close(dirfsp);
2171                 file_free(NULL, dirfsp);
2172         }
2173         TALLOC_FREE(tmp_ctx);
2174         return ret;
2175 }
2176
2177 static NTSTATUS shadow_copy2_get_nt_acl_at(vfs_handle_struct *handle,
2178                                         struct files_struct *dirfsp,
2179                                         const struct smb_filename *smb_fname,
2180                                         uint32_t security_info,
2181                                         TALLOC_CTX *mem_ctx,
2182                                         struct security_descriptor **ppdesc)
2183 {
2184         time_t timestamp = 0;
2185         char *stripped = NULL;
2186         NTSTATUS status;
2187         char *conv;
2188         struct smb_filename *conv_smb_fname = NULL;
2189
2190         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2191                                         handle,
2192                                         smb_fname,
2193                                         &timestamp,
2194                                         &stripped)) {
2195                 return map_nt_error_from_unix(errno);
2196         }
2197         if (timestamp == 0) {
2198                 return SMB_VFS_NEXT_GET_NT_ACL_AT(handle,
2199                                         dirfsp,
2200                                         smb_fname,
2201                                         security_info,
2202                                         mem_ctx,
2203                                         ppdesc);
2204         }
2205         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2206         TALLOC_FREE(stripped);
2207         if (conv == NULL) {
2208                 return map_nt_error_from_unix(errno);
2209         }
2210         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2211                                         conv,
2212                                         NULL,
2213                                         NULL,
2214                                         0,
2215                                         smb_fname->flags);
2216         if (conv_smb_fname == NULL) {
2217                 TALLOC_FREE(conv);
2218                 return NT_STATUS_NO_MEMORY;
2219         }
2220         status = SMB_VFS_NEXT_GET_NT_ACL_AT(handle,
2221                                         dirfsp,
2222                                         conv_smb_fname,
2223                                         security_info,
2224                                         mem_ctx,
2225                                         ppdesc);
2226         TALLOC_FREE(conv);
2227         TALLOC_FREE(conv_smb_fname);
2228         return status;
2229 }
2230
2231 static int shadow_copy2_mkdirat(vfs_handle_struct *handle,
2232                                 struct files_struct *dirfsp,
2233                                 const struct smb_filename *smb_fname,
2234                                 mode_t mode)
2235 {
2236         struct smb_filename *full_fname = NULL;
2237         time_t timestamp = 0;
2238
2239         full_fname = full_path_from_dirfsp_atname(talloc_tos(),
2240                                                   dirfsp,
2241                                                   smb_fname);
2242         if (full_fname == NULL) {
2243                 errno = ENOMEM;
2244                 return -1;
2245         }
2246
2247         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2248                                         handle,
2249                                         full_fname,
2250                                         &timestamp,
2251                                         NULL)) {
2252                 return -1;
2253         }
2254         TALLOC_FREE(full_fname);
2255         if (timestamp != 0) {
2256                 errno = EROFS;
2257                 return -1;
2258         }
2259         return SMB_VFS_NEXT_MKDIRAT(handle,
2260                         dirfsp,
2261                         smb_fname,
2262                         mode);
2263 }
2264
2265 static int shadow_copy2_chflags(vfs_handle_struct *handle,
2266                                 const struct smb_filename *smb_fname,
2267                                 unsigned int flags)
2268 {
2269         time_t timestamp = 0;
2270
2271         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2272                                         handle,
2273                                         smb_fname,
2274                                         &timestamp,
2275                                         NULL)) {
2276                 return -1;
2277         }
2278         if (timestamp != 0) {
2279                 errno = EROFS;
2280                 return -1;
2281         }
2282         return SMB_VFS_NEXT_CHFLAGS(handle, smb_fname, flags);
2283 }
2284
2285 static ssize_t shadow_copy2_getxattr(vfs_handle_struct *handle,
2286                                 const struct smb_filename *smb_fname,
2287                                 const char *aname,
2288                                 void *value,
2289                                 size_t size)
2290 {
2291         time_t timestamp = 0;
2292         char *stripped = NULL;
2293         ssize_t ret;
2294         int saved_errno = 0;
2295         char *conv;
2296         struct smb_filename *conv_smb_fname = NULL;
2297
2298         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2299                                 handle,
2300                                 smb_fname,
2301                                 &timestamp,
2302                                 &stripped)) {
2303                 return -1;
2304         }
2305         if (timestamp == 0) {
2306                 return SMB_VFS_NEXT_GETXATTR(handle, smb_fname, aname, value,
2307                                              size);
2308         }
2309         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2310         TALLOC_FREE(stripped);
2311         if (conv == NULL) {
2312                 return -1;
2313         }
2314
2315         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2316                                         conv,
2317                                         NULL,
2318                                         NULL,
2319                                         0,
2320                                         smb_fname->flags);
2321         if (conv_smb_fname == NULL) {
2322                 TALLOC_FREE(conv);
2323                 return -1;
2324         }
2325
2326         ret = SMB_VFS_NEXT_GETXATTR(handle, conv_smb_fname, aname, value, size);
2327         if (ret == -1) {
2328                 saved_errno = errno;
2329         }
2330         TALLOC_FREE(conv_smb_fname);
2331         TALLOC_FREE(conv);
2332         if (saved_errno != 0) {
2333                 errno = saved_errno;
2334         }
2335         return ret;
2336 }
2337
2338 static int shadow_copy2_fsetxattr(struct vfs_handle_struct *handle,
2339                                  struct files_struct *fsp,
2340                                  const char *aname, const void *value,
2341                                  size_t size, int flags)
2342 {
2343         time_t timestamp = 0;
2344         const struct smb_filename *smb_fname = NULL;
2345
2346         smb_fname = fsp->fsp_name;
2347         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2348                                 handle,
2349                                 smb_fname,
2350                                 &timestamp,
2351                                 NULL)) {
2352                 return -1;
2353         }
2354         if (timestamp != 0) {
2355                 errno = EROFS;
2356                 return -1;
2357         }
2358         return SMB_VFS_NEXT_FSETXATTR(handle, fsp,
2359                                 aname, value, size, flags);
2360 }
2361
2362 static NTSTATUS shadow_copy2_create_dfs_pathat(struct vfs_handle_struct *handle,
2363                                 struct files_struct *dirfsp,
2364                                 const struct smb_filename *smb_fname,
2365                                 const struct referral *reflist,
2366                                 size_t referral_count)
2367 {
2368         time_t timestamp = 0;
2369
2370         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2371                                         handle,
2372                                         smb_fname,
2373                                         &timestamp,
2374                                         NULL)) {
2375                 return NT_STATUS_NO_MEMORY;
2376         }
2377         if (timestamp != 0) {
2378                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
2379         }
2380         return SMB_VFS_NEXT_CREATE_DFS_PATHAT(handle,
2381                         dirfsp,
2382                         smb_fname,
2383                         reflist,
2384                         referral_count);
2385 }
2386
2387 static NTSTATUS shadow_copy2_read_dfs_pathat(struct vfs_handle_struct *handle,
2388                                 TALLOC_CTX *mem_ctx,
2389                                 struct files_struct *dirfsp,
2390                                 struct smb_filename *smb_fname,
2391                                 struct referral **ppreflist,
2392                                 size_t *preferral_count)
2393 {
2394         time_t timestamp = 0;
2395         char *stripped = NULL;
2396         struct smb_filename *conv = NULL;
2397         NTSTATUS status;
2398
2399         if (!shadow_copy2_strip_snapshot(mem_ctx,
2400                                         handle,
2401                                         smb_fname,
2402                                         &timestamp,
2403                                         &stripped)) {
2404                 return NT_STATUS_NO_MEMORY;
2405         }
2406         if (timestamp == 0) {
2407                 return SMB_VFS_NEXT_READ_DFS_PATHAT(handle,
2408                                         mem_ctx,
2409                                         dirfsp,
2410                                         smb_fname,
2411                                         ppreflist,
2412                                         preferral_count);
2413         }
2414
2415         conv = cp_smb_filename(mem_ctx, smb_fname);
2416         if (conv == NULL) {
2417                 TALLOC_FREE(stripped);
2418                 return NT_STATUS_NO_MEMORY;
2419         }
2420         conv->base_name = shadow_copy2_convert(conv,
2421                                         handle,
2422                                         stripped,
2423                                         timestamp);
2424         TALLOC_FREE(stripped);
2425         if (conv->base_name == NULL) {
2426                 TALLOC_FREE(conv);
2427                 return NT_STATUS_NO_MEMORY;
2428         }
2429
2430         status = SMB_VFS_NEXT_READ_DFS_PATHAT(handle,
2431                                 mem_ctx,
2432                                 dirfsp,
2433                                 conv,
2434                                 ppreflist,
2435                                 preferral_count);
2436
2437         if (NT_STATUS_IS_OK(status)) {
2438                 /* Return any stat(2) info. */
2439                 smb_fname->st = conv->st;
2440         }
2441
2442         TALLOC_FREE(conv);
2443         return status;
2444 }
2445
2446 static int shadow_copy2_get_real_filename(struct vfs_handle_struct *handle,
2447                                           const struct smb_filename *fname,
2448                                           const char *name,
2449                                           TALLOC_CTX *mem_ctx,
2450                                           char **found_name)
2451 {
2452         struct shadow_copy2_private *priv = NULL;
2453         struct shadow_copy2_config *config = NULL;
2454         time_t timestamp = 0;
2455         char *stripped = NULL;
2456         ssize_t ret;
2457         int saved_errno = 0;
2458         char *conv;
2459         struct smb_filename conv_fname;
2460
2461         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
2462                                 return -1);
2463         config = priv->config;
2464
2465         DBG_DEBUG("Path=[%s] name=[%s]\n", smb_fname_str_dbg(fname), name);
2466
2467         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
2468                                          &timestamp, &stripped)) {
2469                 DEBUG(10, ("shadow_copy2_strip_snapshot failed\n"));
2470                 return -1;
2471         }
2472         if (timestamp == 0) {
2473                 DEBUG(10, ("timestamp == 0\n"));
2474                 return SMB_VFS_NEXT_GET_REAL_FILENAME(handle, fname, name,
2475                                                       mem_ctx, found_name);
2476         }
2477
2478         /*
2479          * Note that stripped may be an empty string "" if path was ".". As
2480          * shadow_copy2_convert() combines "" with the shadow-copy tree connect
2481          * root fullpath and get_real_filename_full_scan() has an explicit check
2482          * for "" this works.
2483          */
2484         DBG_DEBUG("stripped [%s]\n", stripped);
2485
2486         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2487         if (conv == NULL) {
2488                 if (!config->snapdirseverywhere) {
2489                         DBG_DEBUG("shadow_copy2_convert [%s] failed\n", stripped);
2490                         return -1;
2491                 }
2492
2493                 /*
2494                  * We're called in the path traversal loop in unix_convert()
2495                  * walking down the directory hierarchy. shadow_copy2_convert()
2496                  * will fail if the snapshot directory is futher down in the
2497                  * hierachy. Set conv to the original stripped path and try to
2498                  * look it up in the filesystem with
2499                  * SMB_VFS_NEXT_GET_REAL_FILENAME() or
2500                  * get_real_filename_full_scan().
2501                  */
2502                 DBG_DEBUG("Use stripped [%s] as conv\n", stripped);
2503                 conv = talloc_strdup(talloc_tos(), stripped);
2504                 if (conv == NULL) {
2505                         TALLOC_FREE(stripped);
2506                         return -1;
2507                 }
2508         }
2509
2510         conv_fname = (struct smb_filename) {
2511                 .base_name = conv,
2512         };
2513
2514         DEBUG(10, ("Calling NEXT_GET_REAL_FILE_NAME for conv=[%s], "
2515                    "name=[%s]\n", conv, name));
2516         ret = SMB_VFS_NEXT_GET_REAL_FILENAME(handle, &conv_fname, name,
2517                                              mem_ctx, found_name);
2518         DEBUG(10, ("NEXT_REAL_FILE_NAME returned %d\n", (int)ret));
2519         if (ret == 0) {
2520                 return 0;
2521         }
2522         if (errno != EOPNOTSUPP) {
2523                 TALLOC_FREE(conv);
2524                 errno = EOPNOTSUPP;
2525                 return -1;
2526         }
2527
2528         ret = get_real_filename_full_scan(handle->conn,
2529                                           conv,
2530                                           name,
2531                                           false,
2532                                           mem_ctx,
2533                                           found_name);
2534         if (ret != 0) {
2535                 saved_errno = errno;
2536                 DBG_DEBUG("Scan [%s] for [%s] failed\n",
2537                           conv, name);
2538                 errno = saved_errno;
2539                 return -1;
2540         }
2541
2542         DBG_DEBUG("Scan [%s] for [%s] returned [%s]\n",
2543                   conv, name, *found_name);
2544
2545         TALLOC_FREE(conv);
2546         return 0;
2547 }
2548
2549 static const char *shadow_copy2_connectpath(struct vfs_handle_struct *handle,
2550                                         const struct smb_filename *smb_fname_in)
2551 {
2552         time_t timestamp = 0;
2553         char *stripped = NULL;
2554         char *tmp = NULL;
2555         const char *fname = smb_fname_in->base_name;
2556         struct smb_filename smb_fname = {0};
2557         struct smb_filename *result_fname = NULL;
2558         char *result = NULL;
2559         char *parent_dir = NULL;
2560         int saved_errno = 0;
2561         size_t rootpath_len = 0;
2562         struct shadow_copy2_private *priv = NULL;
2563
2564         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
2565                                 return NULL);
2566
2567         DBG_DEBUG("Calc connect path for [%s]\n", fname);
2568
2569         if (priv->shadow_connectpath != NULL) {
2570                 DBG_DEBUG("cached connect path is [%s]\n",
2571                         priv->shadow_connectpath);
2572                 return priv->shadow_connectpath;
2573         }
2574
2575         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, smb_fname_in,
2576                                          &timestamp, &stripped)) {
2577                 goto done;
2578         }
2579         if (timestamp == 0) {
2580                 return SMB_VFS_NEXT_CONNECTPATH(handle, smb_fname_in);
2581         }
2582
2583         tmp = shadow_copy2_do_convert(talloc_tos(), handle, stripped, timestamp,
2584                                       &rootpath_len);
2585         if (tmp == NULL) {
2586                 if (errno != ENOENT) {
2587                         goto done;
2588                 }
2589
2590                 /*
2591                  * If the converted path does not exist, and converting
2592                  * the parent yields something that does exist, then
2593                  * this path refers to something that has not been
2594                  * created yet, relative to the parent path.
2595                  * The snapshot finding is relative to the parent.
2596                  * (usually snapshots are read/only but this is not
2597                  * necessarily true).
2598                  * This code also covers getting a wildcard in the
2599                  * last component, because this function is called
2600                  * prior to sanitizing the path, and in SMB1 we may
2601                  * get wildcards in path names.
2602                  */
2603                 if (!parent_dirname(talloc_tos(), stripped, &parent_dir,
2604                                     NULL)) {
2605                         errno = ENOMEM;
2606                         goto done;
2607                 }
2608
2609                 tmp = shadow_copy2_do_convert(talloc_tos(), handle, parent_dir,
2610                                               timestamp, &rootpath_len);
2611                 if (tmp == NULL) {
2612                         goto done;
2613                 }
2614         }
2615
2616         DBG_DEBUG("converted path is [%s] root path is [%.*s]\n", tmp,
2617                   (int)rootpath_len, tmp);
2618
2619         tmp[rootpath_len] = '\0';
2620         smb_fname = (struct smb_filename) { .base_name = tmp };
2621
2622         result_fname = SMB_VFS_NEXT_REALPATH(handle, priv, &smb_fname);
2623         if (result_fname == NULL) {
2624                 goto done;
2625         }
2626
2627         /*
2628          * SMB_VFS_NEXT_REALPATH returns a talloc'ed string.
2629          * Don't leak memory.
2630          */
2631         TALLOC_FREE(priv->shadow_realpath);
2632         priv->shadow_realpath = result_fname;
2633         result = priv->shadow_realpath->base_name;
2634
2635         DBG_DEBUG("connect path is [%s]\n", result);
2636
2637 done:
2638         if (result == NULL) {
2639                 saved_errno = errno;
2640         }
2641         TALLOC_FREE(tmp);
2642         TALLOC_FREE(stripped);
2643         TALLOC_FREE(parent_dir);
2644         if (saved_errno != 0) {
2645                 errno = saved_errno;
2646         }
2647         return result;
2648 }
2649
2650 static uint64_t shadow_copy2_disk_free(vfs_handle_struct *handle,
2651                                 const struct smb_filename *smb_fname,
2652                                 uint64_t *bsize,
2653                                 uint64_t *dfree,
2654                                 uint64_t *dsize)
2655 {
2656         time_t timestamp = 0;
2657         char *stripped = NULL;
2658         int saved_errno = 0;
2659         char *conv = NULL;
2660         struct smb_filename *conv_smb_fname = NULL;
2661         uint64_t ret = (uint64_t)-1;
2662
2663         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2664                                 handle,
2665                                 smb_fname,
2666                                 &timestamp,
2667                                 &stripped)) {
2668                 return (uint64_t)-1;
2669         }
2670         if (timestamp == 0) {
2671                 return SMB_VFS_NEXT_DISK_FREE(handle, smb_fname,
2672                                               bsize, dfree, dsize);
2673         }
2674         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2675         TALLOC_FREE(stripped);
2676         if (conv == NULL) {
2677                 return (uint64_t)-1;
2678         }
2679         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2680                                         conv,
2681                                         NULL,
2682                                         NULL,
2683                                         0,
2684                                         smb_fname->flags);
2685         if (conv_smb_fname == NULL) {
2686                 TALLOC_FREE(conv);
2687                 return (uint64_t)-1;
2688         }
2689         ret = SMB_VFS_NEXT_DISK_FREE(handle, conv_smb_fname,
2690                                 bsize, dfree, dsize);
2691         if (ret == (uint64_t)-1) {
2692                 saved_errno = errno;
2693         }
2694         TALLOC_FREE(conv);
2695         TALLOC_FREE(conv_smb_fname);
2696         if (saved_errno != 0) {
2697                 errno = saved_errno;
2698         }
2699         return ret;
2700 }
2701
2702 static int shadow_copy2_get_quota(vfs_handle_struct *handle,
2703                                 const struct smb_filename *smb_fname,
2704                                 enum SMB_QUOTA_TYPE qtype,
2705                                 unid_t id,
2706                                 SMB_DISK_QUOTA *dq)
2707 {
2708         time_t timestamp = 0;
2709         char *stripped = NULL;
2710         int ret;
2711         int saved_errno = 0;
2712         char *conv;
2713         struct smb_filename *conv_smb_fname = NULL;
2714
2715         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2716                                 handle,
2717                                 smb_fname,
2718                                 &timestamp,
2719                                 &stripped)) {
2720                 return -1;
2721         }
2722         if (timestamp == 0) {
2723                 return SMB_VFS_NEXT_GET_QUOTA(handle, smb_fname, qtype, id, dq);
2724         }
2725
2726         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2727         TALLOC_FREE(stripped);
2728         if (conv == NULL) {
2729                 return -1;
2730         }
2731         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2732                                         conv,
2733                                         NULL,
2734                                         NULL,
2735                                         0,
2736                                         smb_fname->flags);
2737         if (conv_smb_fname == NULL) {
2738                 TALLOC_FREE(conv);
2739                 return -1;
2740         }
2741         ret = SMB_VFS_NEXT_GET_QUOTA(handle, conv_smb_fname, qtype, id, dq);
2742
2743         if (ret == -1) {
2744                 saved_errno = errno;
2745         }
2746         TALLOC_FREE(conv);
2747         TALLOC_FREE(conv_smb_fname);
2748         if (saved_errno != 0) {
2749                 errno = saved_errno;
2750         }
2751
2752         return ret;
2753 }
2754
2755 static ssize_t shadow_copy2_pwrite(vfs_handle_struct *handle,
2756                                    files_struct *fsp,
2757                                    const void *data,
2758                                    size_t n,
2759                                    off_t offset)
2760 {
2761         ssize_t nwritten;
2762
2763         nwritten = SMB_VFS_NEXT_PWRITE(handle, fsp, data, n, offset);
2764         if (nwritten == -1) {
2765                 if (errno == EBADF && fsp->fsp_flags.can_write) {
2766                         errno = EROFS;
2767                 }
2768         }
2769
2770         return nwritten;
2771 }
2772
2773 struct shadow_copy2_pwrite_state {
2774         vfs_handle_struct *handle;
2775         files_struct *fsp;
2776         ssize_t ret;
2777         struct vfs_aio_state vfs_aio_state;
2778 };
2779
2780 static void shadow_copy2_pwrite_done(struct tevent_req *subreq);
2781
2782 static struct tevent_req *shadow_copy2_pwrite_send(
2783         struct vfs_handle_struct *handle, TALLOC_CTX *mem_ctx,
2784         struct tevent_context *ev, struct files_struct *fsp,
2785         const void *data, size_t n, off_t offset)
2786 {
2787         struct tevent_req *req = NULL, *subreq = NULL;
2788         struct shadow_copy2_pwrite_state *state = NULL;
2789
2790         req = tevent_req_create(mem_ctx, &state,
2791                                 struct shadow_copy2_pwrite_state);
2792         if (req == NULL) {
2793                 return NULL;
2794         }
2795         state->handle = handle;
2796         state->fsp = fsp;
2797
2798         subreq = SMB_VFS_NEXT_PWRITE_SEND(state,
2799                                           ev,
2800                                           handle,
2801                                           fsp,
2802                                           data,
2803                                           n,
2804                                           offset);
2805         if (tevent_req_nomem(subreq, req)) {
2806                 return tevent_req_post(req, ev);
2807         }
2808         tevent_req_set_callback(subreq, shadow_copy2_pwrite_done, req);
2809
2810         return req;
2811 }
2812
2813 static void shadow_copy2_pwrite_done(struct tevent_req *subreq)
2814 {
2815         struct tevent_req *req = tevent_req_callback_data(
2816                 subreq, struct tevent_req);
2817         struct shadow_copy2_pwrite_state *state = tevent_req_data(
2818                 req, struct shadow_copy2_pwrite_state);
2819
2820         state->ret = SMB_VFS_PWRITE_RECV(subreq, &state->vfs_aio_state);
2821         TALLOC_FREE(subreq);
2822         if (state->ret == -1) {
2823                 tevent_req_error(req, state->vfs_aio_state.error);
2824                 return;
2825         }
2826
2827         tevent_req_done(req);
2828 }
2829
2830 static ssize_t shadow_copy2_pwrite_recv(struct tevent_req *req,
2831                                           struct vfs_aio_state *vfs_aio_state)
2832 {
2833         struct shadow_copy2_pwrite_state *state = tevent_req_data(
2834                 req, struct shadow_copy2_pwrite_state);
2835
2836         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
2837                 if ((vfs_aio_state->error == EBADF) &&
2838                     state->fsp->fsp_flags.can_write)
2839                 {
2840                         vfs_aio_state->error = EROFS;
2841                         errno = EROFS;
2842                 }
2843                 return -1;
2844         }
2845
2846         *vfs_aio_state = state->vfs_aio_state;
2847         return state->ret;
2848 }
2849
2850 static int shadow_copy2_connect(struct vfs_handle_struct *handle,
2851                                 const char *service, const char *user)
2852 {
2853         struct shadow_copy2_config *config;
2854         struct shadow_copy2_private *priv;
2855         int ret;
2856         const char *snapdir;
2857         const char *snapprefix = NULL;
2858         const char *delimiter;
2859         const char *gmt_format;
2860         const char *sort_order;
2861         const char *basedir = NULL;
2862         const char *snapsharepath = NULL;
2863         const char *mount_point;
2864
2865         DEBUG(10, (__location__ ": cnum[%u], connectpath[%s]\n",
2866                    (unsigned)handle->conn->cnum,
2867                    handle->conn->connectpath));
2868
2869         ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
2870         if (ret < 0) {
2871                 return ret;
2872         }
2873
2874         priv = talloc_zero(handle->conn, struct shadow_copy2_private);
2875         if (priv == NULL) {
2876                 DBG_ERR("talloc_zero() failed\n");
2877                 errno = ENOMEM;
2878                 return -1;
2879         }
2880
2881         priv->snaps = talloc_zero(priv, struct shadow_copy2_snaplist_info);
2882         if (priv->snaps == NULL) {
2883                 DBG_ERR("talloc_zero() failed\n");
2884                 errno = ENOMEM;
2885                 return -1;
2886         }
2887
2888         config = talloc_zero(priv, struct shadow_copy2_config);
2889         if (config == NULL) {
2890                 DEBUG(0, ("talloc_zero() failed\n"));
2891                 errno = ENOMEM;
2892                 return -1;
2893         }
2894
2895         priv->config = config;
2896
2897         gmt_format = lp_parm_const_string(SNUM(handle->conn),
2898                                           "shadow", "format",
2899                                           GMT_FORMAT);
2900         config->gmt_format = talloc_strdup(config, gmt_format);
2901         if (config->gmt_format == NULL) {
2902                 DEBUG(0, ("talloc_strdup() failed\n"));
2903                 errno = ENOMEM;
2904                 return -1;
2905         }
2906
2907         /* config->gmt_format must not contain a path separator. */
2908         if (strchr(config->gmt_format, '/') != NULL) {
2909                 DEBUG(0, ("shadow:format %s must not contain a /"
2910                         "character. Unable to initialize module.\n",
2911                         config->gmt_format));
2912                 errno = EINVAL;
2913                 return -1;
2914         }
2915
2916         config->use_sscanf = lp_parm_bool(SNUM(handle->conn),
2917                                           "shadow", "sscanf", false);
2918
2919         config->use_localtime = lp_parm_bool(SNUM(handle->conn),
2920                                              "shadow", "localtime",
2921                                              false);
2922
2923         snapdir = lp_parm_const_string(SNUM(handle->conn),
2924                                        "shadow", "snapdir",
2925                                        ".snapshots");
2926         config->snapdir = talloc_strdup(config, snapdir);
2927         if (config->snapdir == NULL) {
2928                 DEBUG(0, ("talloc_strdup() failed\n"));
2929                 errno = ENOMEM;
2930                 return -1;
2931         }
2932
2933         snapprefix = lp_parm_const_string(SNUM(handle->conn),
2934                                        "shadow", "snapprefix",
2935                                        NULL);
2936         if (snapprefix != NULL) {
2937                 priv->snaps->regex = talloc_zero(priv->snaps, regex_t);
2938                 if (priv->snaps->regex == NULL) {
2939                         DBG_ERR("talloc_zero() failed\n");
2940                         errno = ENOMEM;
2941                         return -1;
2942                 }
2943
2944                 /* pre-compute regex rule for matching pattern later */
2945                 ret = regcomp(priv->snaps->regex, snapprefix, 0);
2946                 if (ret) {
2947                         DBG_ERR("Failed to create regex object\n");
2948                         return -1;
2949                 }
2950         }
2951
2952         delimiter = lp_parm_const_string(SNUM(handle->conn),
2953                                        "shadow", "delimiter",
2954                                        "_GMT");
2955         if (delimiter != NULL) {
2956                 priv->config->delimiter = talloc_strdup(priv->config, delimiter);
2957                 if (priv->config->delimiter == NULL) {
2958                         DBG_ERR("talloc_strdup() failed\n");
2959                         errno = ENOMEM;
2960                         return -1;
2961                 }
2962         }
2963
2964         config->snapdirseverywhere = lp_parm_bool(SNUM(handle->conn),
2965                                                   "shadow",
2966                                                   "snapdirseverywhere",
2967                                                   false);
2968
2969         config->crossmountpoints = lp_parm_bool(SNUM(handle->conn),
2970                                                 "shadow", "crossmountpoints",
2971                                                 false);
2972
2973         if (config->crossmountpoints && !config->snapdirseverywhere) {
2974                 DBG_WARNING("Warning: 'crossmountpoints' depends on "
2975                             "'snapdirseverywhere'. Disabling crossmountpoints.\n");
2976         }
2977
2978         config->fixinodes = lp_parm_bool(SNUM(handle->conn),
2979                                          "shadow", "fixinodes",
2980                                          false);
2981
2982         sort_order = lp_parm_const_string(SNUM(handle->conn),
2983                                           "shadow", "sort", "desc");
2984         config->sort_order = talloc_strdup(config, sort_order);
2985         if (config->sort_order == NULL) {
2986                 DEBUG(0, ("talloc_strdup() failed\n"));
2987                 errno = ENOMEM;
2988                 return -1;
2989         }
2990
2991         mount_point = lp_parm_const_string(SNUM(handle->conn),
2992                                            "shadow", "mountpoint", NULL);
2993         if (mount_point != NULL) {
2994                 if (mount_point[0] != '/') {
2995                         DEBUG(1, (__location__ " Warning: 'mountpoint' is "
2996                                   "relative ('%s'), but it has to be an "
2997                                   "absolute path. Ignoring provided value.\n",
2998                                   mount_point));
2999                         mount_point = NULL;
3000                 } else {
3001                         char *p;
3002                         p = strstr(handle->conn->connectpath, mount_point);
3003                         if (p != handle->conn->connectpath) {
3004                                 DBG_WARNING("Warning: the share root (%s) is "
3005                                             "not a subdirectory of the "
3006                                             "specified mountpoint (%s). "
3007                                             "Ignoring provided value.\n",
3008                                             handle->conn->connectpath,
3009                                             mount_point);
3010                                 mount_point = NULL;
3011                         }
3012                 }
3013         }
3014
3015         if (mount_point != NULL) {
3016                 config->mount_point = talloc_strdup(config, mount_point);
3017                 if (config->mount_point == NULL) {
3018                         DEBUG(0, (__location__ " talloc_strdup() failed\n"));
3019                         return -1;
3020                 }
3021         } else {
3022                 config->mount_point = shadow_copy2_find_mount_point(config,
3023                                                                     handle);
3024                 if (config->mount_point == NULL) {
3025                         DBG_WARNING("shadow_copy2_find_mount_point "
3026                                     "of the share root '%s' failed: %s\n",
3027                                     handle->conn->connectpath, strerror(errno));
3028                         return -1;
3029                 }
3030         }
3031
3032         basedir = lp_parm_const_string(SNUM(handle->conn),
3033                                        "shadow", "basedir", NULL);
3034
3035         if (basedir != NULL) {
3036                 if (basedir[0] != '/') {
3037                         DEBUG(1, (__location__ " Warning: 'basedir' is "
3038                                   "relative ('%s'), but it has to be an "
3039                                   "absolute path. Disabling basedir.\n",
3040                                   basedir));
3041                         basedir = NULL;
3042                 } else {
3043                         char *p;
3044                         p = strstr(basedir, config->mount_point);
3045                         if (p != basedir) {
3046                                 DEBUG(1, ("Warning: basedir (%s) is not a "
3047                                           "subdirectory of the share root's "
3048                                           "mount point (%s). "
3049                                           "Disabling basedir\n",
3050                                           basedir, config->mount_point));
3051                                 basedir = NULL;
3052                         }
3053                 }
3054         }
3055
3056         if (config->snapdirseverywhere && basedir != NULL) {
3057                 DEBUG(1, (__location__ " Warning: 'basedir' is incompatible "
3058                           "with 'snapdirseverywhere'. Disabling basedir.\n"));
3059                 basedir = NULL;
3060         }
3061
3062         snapsharepath = lp_parm_const_string(SNUM(handle->conn), "shadow",
3063                                              "snapsharepath", NULL);
3064         if (snapsharepath != NULL) {
3065                 if (snapsharepath[0] == '/') {
3066                         DBG_WARNING("Warning: 'snapsharepath' is "
3067                                     "absolute ('%s'), but it has to be a "
3068                                     "relative path. Disabling snapsharepath.\n",
3069                                     snapsharepath);
3070                         snapsharepath = NULL;
3071                 }
3072                 if (config->snapdirseverywhere && snapsharepath != NULL) {
3073                         DBG_WARNING("Warning: 'snapsharepath' is incompatible "
3074                                     "with 'snapdirseverywhere'. Disabling "
3075                                     "snapsharepath.\n");
3076                         snapsharepath = NULL;
3077                 }
3078         }
3079
3080         if (basedir != NULL && snapsharepath != NULL) {
3081                 DBG_WARNING("Warning: 'snapsharepath' is incompatible with "
3082                             "'basedir'. Disabling snapsharepath\n");
3083                 snapsharepath = NULL;
3084         }
3085
3086         if (snapsharepath != NULL) {
3087                 config->rel_connectpath = talloc_strdup(config, snapsharepath);
3088                 if (config->rel_connectpath == NULL) {
3089                         DBG_ERR("talloc_strdup() failed\n");
3090                         errno = ENOMEM;
3091                         return -1;
3092                 }
3093         }
3094
3095         if (basedir == NULL) {
3096                 basedir = config->mount_point;
3097         }
3098
3099         if (config->rel_connectpath == NULL &&
3100             strlen(basedir) < strlen(handle->conn->connectpath)) {
3101                 config->rel_connectpath = talloc_strdup(config,
3102                         handle->conn->connectpath + strlen(basedir));
3103                 if (config->rel_connectpath == NULL) {
3104                         DEBUG(0, ("talloc_strdup() failed\n"));
3105                         errno = ENOMEM;
3106                         return -1;
3107                 }
3108         }
3109
3110         if (config->snapdir[0] == '/') {
3111                 config->snapdir_absolute = true;
3112
3113                 if (config->snapdirseverywhere == true) {
3114                         DEBUG(1, (__location__ " Warning: An absolute snapdir "
3115                                   "is incompatible with 'snapdirseverywhere', "
3116                                   "setting 'snapdirseverywhere' to false.\n"));
3117                         config->snapdirseverywhere = false;
3118                 }
3119
3120                 if (config->crossmountpoints == true) {
3121                         DEBUG(1, (__location__ " Warning: 'crossmountpoints' "
3122                                   "is not supported with an absolute snapdir. "
3123                                   "Disabling it.\n"));
3124                         config->crossmountpoints = false;
3125                 }
3126
3127                 config->snapshot_basepath = config->snapdir;
3128         } else {
3129                 config->snapshot_basepath = talloc_asprintf(config, "%s/%s",
3130                                 config->mount_point, config->snapdir);
3131                 if (config->snapshot_basepath == NULL) {
3132                         DEBUG(0, ("talloc_asprintf() failed\n"));
3133                         errno = ENOMEM;
3134                         return -1;
3135                 }
3136         }
3137
3138         trim_string(config->mount_point, NULL, "/");
3139         trim_string(config->rel_connectpath, "/", "/");
3140         trim_string(config->snapdir, NULL, "/");
3141         trim_string(config->snapshot_basepath, NULL, "/");
3142
3143         DEBUG(10, ("shadow_copy2_connect: configuration:\n"
3144                    "  share root: '%s'\n"
3145                    "  mountpoint: '%s'\n"
3146                    "  rel share root: '%s'\n"
3147                    "  snapdir: '%s'\n"
3148                    "  snapprefix: '%s'\n"
3149                    "  delimiter: '%s'\n"
3150                    "  snapshot base path: '%s'\n"
3151                    "  format: '%s'\n"
3152                    "  use sscanf: %s\n"
3153                    "  snapdirs everywhere: %s\n"
3154                    "  cross mountpoints: %s\n"
3155                    "  fix inodes: %s\n"
3156                    "  sort order: %s\n"
3157                    "",
3158                    handle->conn->connectpath,
3159                    config->mount_point,
3160                    config->rel_connectpath,
3161                    config->snapdir,
3162                    snapprefix,
3163                    config->delimiter,
3164                    config->snapshot_basepath,
3165                    config->gmt_format,
3166                    config->use_sscanf ? "yes" : "no",
3167                    config->snapdirseverywhere ? "yes" : "no",
3168                    config->crossmountpoints ? "yes" : "no",
3169                    config->fixinodes ? "yes" : "no",
3170                    config->sort_order
3171                    ));
3172
3173
3174         SMB_VFS_HANDLE_SET_DATA(handle, priv,
3175                                 NULL, struct shadow_copy2_private,
3176                                 return -1);
3177
3178         return 0;
3179 }
3180
3181 static struct vfs_fn_pointers vfs_shadow_copy2_fns = {
3182         .connect_fn = shadow_copy2_connect,
3183         .disk_free_fn = shadow_copy2_disk_free,
3184         .get_quota_fn = shadow_copy2_get_quota,
3185         .create_dfs_pathat_fn = shadow_copy2_create_dfs_pathat,
3186         .read_dfs_pathat_fn = shadow_copy2_read_dfs_pathat,
3187         .renameat_fn = shadow_copy2_renameat,
3188         .linkat_fn = shadow_copy2_linkat,
3189         .symlinkat_fn = shadow_copy2_symlinkat,
3190         .stat_fn = shadow_copy2_stat,
3191         .lstat_fn = shadow_copy2_lstat,
3192         .fstat_fn = shadow_copy2_fstat,
3193         .openat_fn = shadow_copy2_openat,
3194         .unlinkat_fn = shadow_copy2_unlinkat,
3195         .chmod_fn = shadow_copy2_chmod,
3196         .fchmod_fn = shadow_copy2_fchmod,
3197         .chdir_fn = shadow_copy2_chdir,
3198         .ntimes_fn = shadow_copy2_ntimes,
3199         .readlinkat_fn = shadow_copy2_readlinkat,
3200         .mknodat_fn = shadow_copy2_mknodat,
3201         .realpath_fn = shadow_copy2_realpath,
3202         .get_nt_acl_at_fn = shadow_copy2_get_nt_acl_at,
3203         .get_shadow_copy_data_fn = shadow_copy2_get_shadow_copy_data,
3204         .mkdirat_fn = shadow_copy2_mkdirat,
3205         .getxattr_fn = shadow_copy2_getxattr,
3206         .getxattrat_send_fn = vfs_not_implemented_getxattrat_send,
3207         .getxattrat_recv_fn = vfs_not_implemented_getxattrat_recv,
3208         .fsetxattr_fn = shadow_copy2_fsetxattr,
3209         .chflags_fn = shadow_copy2_chflags,
3210         .get_real_filename_fn = shadow_copy2_get_real_filename,
3211         .pwrite_fn = shadow_copy2_pwrite,
3212         .pwrite_send_fn = shadow_copy2_pwrite_send,
3213         .pwrite_recv_fn = shadow_copy2_pwrite_recv,
3214         .connectpath_fn = shadow_copy2_connectpath,
3215 };
3216
3217 static_decl_vfs;
3218 NTSTATUS vfs_shadow_copy2_init(TALLOC_CTX *ctx)
3219 {
3220         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION,
3221                                 "shadow_copy2", &vfs_shadow_copy2_fns);
3222 }