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 name
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_open(vfs_handle_struct *handle,
1322                              struct smb_filename *smb_fname, files_struct *fsp,
1323                              int flags, mode_t mode)
1324 {
1325         time_t timestamp = 0;
1326         char *stripped = NULL;
1327         char *tmp;
1328         bool is_converted = false;
1329         int saved_errno = 0;
1330         int ret;
1331
1332         if (!shadow_copy2_strip_snapshot_converted(talloc_tos(), handle,
1333                                          smb_fname,
1334                                          &timestamp, &stripped,
1335                                          &is_converted)) {
1336                 return -1;
1337         }
1338         if (timestamp == 0) {
1339                 if (is_converted) {
1340                         /*
1341                          * Just pave over the user requested mode and use
1342                          * O_RDONLY. Later attempts by the client to write on
1343                          * the handle will fail in the pwrite() syscall with
1344                          * EINVAL which we carefully map to EROFS. In sum, this
1345                          * matches Windows behaviour.
1346                          */
1347                         flags = O_RDONLY;
1348                 }
1349                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
1350         }
1351
1352         tmp = smb_fname->base_name;
1353         smb_fname->base_name = shadow_copy2_convert(
1354                 talloc_tos(), handle, stripped, timestamp);
1355         TALLOC_FREE(stripped);
1356
1357         if (smb_fname->base_name == NULL) {
1358                 smb_fname->base_name = tmp;
1359                 return -1;
1360         }
1361
1362         /*
1363          * Just pave over the user requested mode and use O_RDONLY. Later
1364          * attempts by the client to write on the handle will fail in the
1365          * pwrite() syscall with EINVAL which we carefully map to EROFS. In sum,
1366          * this matches Windows behaviour.
1367          */
1368         flags = O_RDONLY;
1369
1370         ret = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
1371         if (ret == -1) {
1372                 saved_errno = errno;
1373         }
1374
1375         TALLOC_FREE(smb_fname->base_name);
1376         smb_fname->base_name = tmp;
1377
1378         if (saved_errno != 0) {
1379                 errno = saved_errno;
1380         }
1381         return ret;
1382 }
1383
1384 static int shadow_copy2_unlinkat(vfs_handle_struct *handle,
1385                         struct files_struct *dirfsp,
1386                         const struct smb_filename *smb_fname,
1387                         int flags)
1388 {
1389         time_t timestamp = 0;
1390
1391         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1392                                          smb_fname,
1393                                          &timestamp, NULL)) {
1394                 return -1;
1395         }
1396         if (timestamp != 0) {
1397                 errno = EROFS;
1398                 return -1;
1399         }
1400         return SMB_VFS_NEXT_UNLINKAT(handle,
1401                         dirfsp,
1402                         smb_fname,
1403                         flags);
1404 }
1405
1406 static int shadow_copy2_chmod(vfs_handle_struct *handle,
1407                         const struct smb_filename *smb_fname,
1408                         mode_t mode)
1409 {
1410         time_t timestamp = 0;
1411
1412         if (!shadow_copy2_strip_snapshot(talloc_tos(),
1413                                 handle,
1414                                 smb_fname,
1415                                 &timestamp,
1416                                 NULL)) {
1417                 return -1;
1418         }
1419         if (timestamp != 0) {
1420                 errno = EROFS;
1421                 return -1;
1422         }
1423         return SMB_VFS_NEXT_CHMOD(handle, smb_fname, mode);
1424 }
1425
1426 static void store_cwd_data(vfs_handle_struct *handle,
1427                                 const char *connectpath)
1428 {
1429         struct shadow_copy2_private *priv = NULL;
1430         struct smb_filename *cwd_fname = NULL;
1431
1432         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1433                                 return);
1434
1435         TALLOC_FREE(priv->shadow_cwd);
1436         cwd_fname = SMB_VFS_NEXT_GETWD(handle, talloc_tos());
1437         if (cwd_fname == NULL) {
1438                 smb_panic("getwd failed\n");
1439         }
1440         DBG_DEBUG("shadow cwd = %s\n", cwd_fname->base_name);
1441         priv->shadow_cwd = talloc_strdup(priv, cwd_fname->base_name);
1442         TALLOC_FREE(cwd_fname);
1443         if (priv->shadow_cwd == NULL) {
1444                 smb_panic("talloc failed\n");
1445         }
1446         TALLOC_FREE(priv->shadow_connectpath);
1447         if (connectpath) {
1448                 DBG_DEBUG("shadow connectpath = %s\n", connectpath);
1449                 priv->shadow_connectpath = talloc_strdup(priv, connectpath);
1450                 if (priv->shadow_connectpath == NULL) {
1451                         smb_panic("talloc failed\n");
1452                 }
1453         }
1454 }
1455
1456 static int shadow_copy2_chdir(vfs_handle_struct *handle,
1457                                const struct smb_filename *smb_fname)
1458 {
1459         time_t timestamp = 0;
1460         char *stripped = NULL;
1461         char *snappath = NULL;
1462         int ret = -1;
1463         int saved_errno = 0;
1464         char *conv = NULL;
1465         size_t rootpath_len = 0;
1466         struct smb_filename *conv_smb_fname = NULL;
1467
1468         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
1469                                         handle,
1470                                         smb_fname,
1471                                         &timestamp,
1472                                         &stripped,
1473                                         &snappath,
1474                                         NULL)) {
1475                 return -1;
1476         }
1477         if (stripped != NULL) {
1478                 conv = shadow_copy2_do_convert(talloc_tos(),
1479                                                 handle,
1480                                                 stripped,
1481                                                 timestamp,
1482                                                 &rootpath_len);
1483                 TALLOC_FREE(stripped);
1484                 if (conv == NULL) {
1485                         return -1;
1486                 }
1487                 conv_smb_fname = synthetic_smb_fname(talloc_tos(),
1488                                         conv,
1489                                         NULL,
1490                                         NULL,
1491                                         0,
1492                                         smb_fname->flags);
1493         } else {
1494                 conv_smb_fname = cp_smb_filename(talloc_tos(), smb_fname);
1495         }
1496
1497         if (conv_smb_fname == NULL) {
1498                 TALLOC_FREE(conv);
1499                 errno = ENOMEM;
1500                 return -1;
1501         }
1502
1503         ret = SMB_VFS_NEXT_CHDIR(handle, conv_smb_fname);
1504         if (ret == -1) {
1505                 saved_errno = errno;
1506         }
1507
1508         if (ret == 0) {
1509                 if (conv != NULL && rootpath_len != 0) {
1510                         conv[rootpath_len] = '\0';
1511                 } else if (snappath != 0) {
1512                         TALLOC_FREE(conv);
1513                         conv = snappath;
1514                 }
1515                 store_cwd_data(handle, conv);
1516         }
1517
1518         TALLOC_FREE(stripped);
1519         TALLOC_FREE(conv);
1520         TALLOC_FREE(conv_smb_fname);
1521
1522         if (saved_errno != 0) {
1523                 errno = saved_errno;
1524         }
1525         return ret;
1526 }
1527
1528 static int shadow_copy2_ntimes(vfs_handle_struct *handle,
1529                                const struct smb_filename *smb_fname,
1530                                struct smb_file_time *ft)
1531 {
1532         time_t timestamp = 0;
1533
1534         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1535                                          smb_fname,
1536                                          &timestamp, NULL)) {
1537                 return -1;
1538         }
1539         if (timestamp != 0) {
1540                 errno = EROFS;
1541                 return -1;
1542         }
1543         return SMB_VFS_NEXT_NTIMES(handle, smb_fname, ft);
1544 }
1545
1546 static int shadow_copy2_readlinkat(vfs_handle_struct *handle,
1547                                 files_struct *dirfsp,
1548                                 const struct smb_filename *smb_fname,
1549                                 char *buf,
1550                                 size_t bufsiz)
1551 {
1552         time_t timestamp = 0;
1553         char *stripped = NULL;
1554         int saved_errno = 0;
1555         int ret;
1556         struct smb_filename *conv = NULL;
1557
1558         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1559                                          smb_fname,
1560                                          &timestamp, &stripped)) {
1561                 return -1;
1562         }
1563         if (timestamp == 0) {
1564                 return SMB_VFS_NEXT_READLINKAT(handle,
1565                                 dirfsp,
1566                                 smb_fname,
1567                                 buf,
1568                                 bufsiz);
1569         }
1570         conv = cp_smb_filename(talloc_tos(), smb_fname);
1571         if (conv == NULL) {
1572                 TALLOC_FREE(stripped);
1573                 errno = ENOMEM;
1574                 return -1;
1575         }
1576         conv->base_name = shadow_copy2_convert(
1577                 conv, handle, stripped, timestamp);
1578         TALLOC_FREE(stripped);
1579         if (conv->base_name == NULL) {
1580                 return -1;
1581         }
1582         ret = SMB_VFS_NEXT_READLINKAT(handle,
1583                                 dirfsp,
1584                                 conv,
1585                                 buf,
1586                                 bufsiz);
1587         if (ret == -1) {
1588                 saved_errno = errno;
1589         }
1590         TALLOC_FREE(conv);
1591         if (saved_errno != 0) {
1592                 errno = saved_errno;
1593         }
1594         return ret;
1595 }
1596
1597 static int shadow_copy2_mknodat(vfs_handle_struct *handle,
1598                         files_struct *dirfsp,
1599                         const struct smb_filename *smb_fname,
1600                         mode_t mode,
1601                         SMB_DEV_T dev)
1602 {
1603         time_t timestamp = 0;
1604
1605         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1606                                          smb_fname,
1607                                          &timestamp, NULL)) {
1608                 return -1;
1609         }
1610         if (timestamp != 0) {
1611                 errno = EROFS;
1612                 return -1;
1613         }
1614         return SMB_VFS_NEXT_MKNODAT(handle,
1615                         dirfsp,
1616                         smb_fname,
1617                         mode,
1618                         dev);
1619 }
1620
1621 static struct smb_filename *shadow_copy2_realpath(vfs_handle_struct *handle,
1622                                 TALLOC_CTX *ctx,
1623                                 const struct smb_filename *smb_fname)
1624 {
1625         time_t timestamp = 0;
1626         char *stripped = NULL;
1627         struct smb_filename *result_fname = NULL;
1628         struct smb_filename *conv_fname = NULL;
1629         int saved_errno = 0;
1630
1631         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1632                                 smb_fname,
1633                                 &timestamp, &stripped)) {
1634                 goto done;
1635         }
1636         if (timestamp == 0) {
1637                 return SMB_VFS_NEXT_REALPATH(handle, ctx, smb_fname);
1638         }
1639
1640         conv_fname = cp_smb_filename(talloc_tos(), smb_fname);
1641         if (conv_fname == NULL) {
1642                 goto done;
1643         }
1644         conv_fname->base_name = shadow_copy2_convert(
1645                 conv_fname, handle, stripped, timestamp);
1646         if (conv_fname->base_name == NULL) {
1647                 goto done;
1648         }
1649
1650         result_fname = SMB_VFS_NEXT_REALPATH(handle, ctx, conv_fname);
1651
1652 done:
1653         if (result_fname == NULL) {
1654                 saved_errno = errno;
1655         }
1656         TALLOC_FREE(conv_fname);
1657         TALLOC_FREE(stripped);
1658         if (saved_errno != 0) {
1659                 errno = saved_errno;
1660         }
1661         return result_fname;
1662 }
1663
1664 /**
1665  * Check whether a given directory contains a
1666  * snapshot directory as direct subdirectory.
1667  * If yes, return the path of the snapshot-subdir,
1668  * otherwise return NULL.
1669  */
1670 static char *have_snapdir(struct vfs_handle_struct *handle,
1671                           const char *path)
1672 {
1673         struct smb_filename smb_fname;
1674         int ret;
1675         struct shadow_copy2_private *priv;
1676
1677         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1678                                 return NULL);
1679
1680         ZERO_STRUCT(smb_fname);
1681         smb_fname.base_name = talloc_asprintf(talloc_tos(), "%s/%s",
1682                                               path, priv->config->snapdir);
1683         if (smb_fname.base_name == NULL) {
1684                 return NULL;
1685         }
1686
1687         ret = SMB_VFS_NEXT_STAT(handle, &smb_fname);
1688         if ((ret == 0) && (S_ISDIR(smb_fname.st.st_ex_mode))) {
1689                 return smb_fname.base_name;
1690         }
1691         TALLOC_FREE(smb_fname.base_name);
1692         return NULL;
1693 }
1694
1695 static bool check_access_snapdir(struct vfs_handle_struct *handle,
1696                                 const char *path)
1697 {
1698         struct smb_filename smb_fname;
1699         int ret;
1700         NTSTATUS status;
1701
1702         ZERO_STRUCT(smb_fname);
1703         smb_fname.base_name = talloc_asprintf(talloc_tos(),
1704                                                 "%s",
1705                                                 path);
1706         if (smb_fname.base_name == NULL) {
1707                 return false;
1708         }
1709
1710         ret = SMB_VFS_NEXT_STAT(handle, &smb_fname);
1711         if (ret != 0 || !S_ISDIR(smb_fname.st.st_ex_mode)) {
1712                 TALLOC_FREE(smb_fname.base_name);
1713                 return false;
1714         }
1715
1716         status = smbd_check_access_rights(handle->conn,
1717                                         handle->conn->cwd_fsp,
1718                                         &smb_fname,
1719                                         false,
1720                                         SEC_DIR_LIST);
1721         if (!NT_STATUS_IS_OK(status)) {
1722                 DEBUG(0,("user does not have list permission "
1723                         "on snapdir %s\n",
1724                         smb_fname.base_name));
1725                 TALLOC_FREE(smb_fname.base_name);
1726                 return false;
1727         }
1728         TALLOC_FREE(smb_fname.base_name);
1729         return true;
1730 }
1731
1732 /**
1733  * Find the snapshot directory (if any) for the given
1734  * filename (which is relative to the share).
1735  */
1736 static const char *shadow_copy2_find_snapdir(TALLOC_CTX *mem_ctx,
1737                                              struct vfs_handle_struct *handle,
1738                                              struct smb_filename *smb_fname)
1739 {
1740         char *path, *p;
1741         const char *snapdir;
1742         struct shadow_copy2_config *config;
1743         struct shadow_copy2_private *priv;
1744
1745         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1746                                 return NULL);
1747
1748         config = priv->config;
1749
1750         /*
1751          * If the non-snapdisrseverywhere mode, we should not search!
1752          */
1753         if (!config->snapdirseverywhere) {
1754                 return config->snapshot_basepath;
1755         }
1756
1757         path = talloc_asprintf(mem_ctx, "%s/%s",
1758                                handle->conn->connectpath,
1759                                smb_fname->base_name);
1760         if (path == NULL) {
1761                 return NULL;
1762         }
1763
1764         snapdir = have_snapdir(handle, path);
1765         if (snapdir != NULL) {
1766                 TALLOC_FREE(path);
1767                 return snapdir;
1768         }
1769
1770         while ((p = strrchr(path, '/')) && (p > path)) {
1771
1772                 p[0] = '\0';
1773
1774                 snapdir = have_snapdir(handle, path);
1775                 if (snapdir != NULL) {
1776                         TALLOC_FREE(path);
1777                         return snapdir;
1778                 }
1779         }
1780         TALLOC_FREE(path);
1781         return NULL;
1782 }
1783
1784 static bool shadow_copy2_snapshot_to_gmt(vfs_handle_struct *handle,
1785                                          const char *name,
1786                                          char *gmt, size_t gmt_len)
1787 {
1788         struct tm timestamp;
1789         time_t timestamp_t;
1790         unsigned long int timestamp_long;
1791         const char *fmt;
1792         struct shadow_copy2_config *config;
1793         struct shadow_copy2_private *priv;
1794         char *tmpstr = NULL;
1795         char *tmp = NULL;
1796         bool converted = false;
1797         int ret = -1;
1798
1799         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1800                                 return NULL);
1801
1802         config = priv->config;
1803
1804         fmt = config->gmt_format;
1805
1806         /*
1807          * If regex is provided, then we will have to parse the
1808          * filename which will contain both the prefix and the time format.
1809          * e.g. <prefix><delimiter><time_format>
1810          */
1811         if (priv->snaps->regex != NULL) {
1812                 tmpstr = talloc_strdup(talloc_tos(), name);
1813                 /* point "name" to the time format */
1814                 name = strstr(name, priv->config->delimiter);
1815                 if (name == NULL) {
1816                         goto done;
1817                 }
1818                 /* Extract the prefix */
1819                 tmp = strstr(tmpstr, priv->config->delimiter);
1820                 if (tmp == NULL) {
1821                         goto done;
1822                 }
1823                 *tmp = '\0';
1824
1825                 /* Parse regex */
1826                 ret = regexec(priv->snaps->regex, tmpstr, 0, NULL, 0);
1827                 if (ret) {
1828                         DBG_DEBUG("shadow_copy2_snapshot_to_gmt: "
1829                                   "no regex match for %s\n", tmpstr);
1830                         goto done;
1831                 }
1832         }
1833
1834         ZERO_STRUCT(timestamp);
1835         if (config->use_sscanf) {
1836                 if (sscanf(name, fmt, &timestamp_long) != 1) {
1837                         DEBUG(10, ("shadow_copy2_snapshot_to_gmt: "
1838                                    "no sscanf match %s: %s\n",
1839                                    fmt, name));
1840                         goto done;
1841                 }
1842                 timestamp_t = timestamp_long;
1843                 gmtime_r(&timestamp_t, &timestamp);
1844         } else {
1845                 if (strptime(name, fmt, &timestamp) == NULL) {
1846                         DEBUG(10, ("shadow_copy2_snapshot_to_gmt: "
1847                                    "no match %s: %s\n",
1848                                    fmt, name));
1849                         goto done;
1850                 }
1851                 DEBUG(10, ("shadow_copy2_snapshot_to_gmt: match %s: %s\n",
1852                            fmt, name));
1853
1854                 if (config->use_localtime) {
1855                         timestamp.tm_isdst = -1;
1856                         timestamp_t = mktime(&timestamp);
1857                         gmtime_r(&timestamp_t, &timestamp);
1858                 }
1859         }
1860
1861         strftime(gmt, gmt_len, GMT_FORMAT, &timestamp);
1862         converted = true;
1863
1864 done:
1865         TALLOC_FREE(tmpstr);
1866         return converted;
1867 }
1868
1869 static int shadow_copy2_label_cmp_asc(const void *x, const void *y)
1870 {
1871         return strncmp((const char *)x, (const char *)y, sizeof(SHADOW_COPY_LABEL));
1872 }
1873
1874 static int shadow_copy2_label_cmp_desc(const void *x, const void *y)
1875 {
1876         return -strncmp((const char *)x, (const char *)y, sizeof(SHADOW_COPY_LABEL));
1877 }
1878
1879 /*
1880   sort the shadow copy data in ascending or descending order
1881  */
1882 static void shadow_copy2_sort_data(vfs_handle_struct *handle,
1883                                    struct shadow_copy_data *shadow_copy2_data)
1884 {
1885         int (*cmpfunc)(const void *, const void *);
1886         const char *sort;
1887         struct shadow_copy2_private *priv;
1888
1889         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1890                                 return);
1891
1892         sort = priv->config->sort_order;
1893         if (sort == NULL) {
1894                 return;
1895         }
1896
1897         if (strcmp(sort, "asc") == 0) {
1898                 cmpfunc = shadow_copy2_label_cmp_asc;
1899         } else if (strcmp(sort, "desc") == 0) {
1900                 cmpfunc = shadow_copy2_label_cmp_desc;
1901         } else {
1902                 return;
1903         }
1904
1905         if (shadow_copy2_data && shadow_copy2_data->num_volumes > 0 &&
1906             shadow_copy2_data->labels)
1907         {
1908                 TYPESAFE_QSORT(shadow_copy2_data->labels,
1909                                shadow_copy2_data->num_volumes,
1910                                cmpfunc);
1911         }
1912 }
1913
1914 static int shadow_copy2_get_shadow_copy_data(
1915         vfs_handle_struct *handle, files_struct *fsp,
1916         struct shadow_copy_data *shadow_copy2_data,
1917         bool labels)
1918 {
1919         DIR *p = NULL;
1920         const char *snapdir;
1921         struct smb_filename *snapdir_smb_fname = NULL;
1922         struct files_struct *dirfsp = NULL;
1923         struct dirent *d;
1924         TALLOC_CTX *tmp_ctx = talloc_stackframe();
1925         struct shadow_copy2_private *priv = NULL;
1926         struct shadow_copy2_snapentry *tmpentry = NULL;
1927         bool get_snaplist = false;
1928         bool access_granted = false;
1929         int open_flags = O_RDONLY;
1930         int ret = -1;
1931         NTSTATUS status;
1932
1933         snapdir = shadow_copy2_find_snapdir(tmp_ctx, handle, fsp->fsp_name);
1934         if (snapdir == NULL) {
1935                 DEBUG(0,("shadow:snapdir not found for %s in get_shadow_copy_data\n",
1936                          handle->conn->connectpath));
1937                 errno = EINVAL;
1938                 goto done;
1939         }
1940
1941         access_granted = check_access_snapdir(handle, snapdir);
1942         if (!access_granted) {
1943                 DEBUG(0,("access denied on listing snapdir %s\n", snapdir));
1944                 errno = EACCES;
1945                 goto done;
1946         }
1947
1948         snapdir_smb_fname = synthetic_smb_fname(talloc_tos(),
1949                                         snapdir,
1950                                         NULL,
1951                                         NULL,
1952                                         0,
1953                                         fsp->fsp_name->flags);
1954         if (snapdir_smb_fname == NULL) {
1955                 errno = ENOMEM;
1956                 goto done;
1957         }
1958
1959         status = create_internal_dirfsp_at(handle->conn,
1960                                            handle->conn->cwd_fsp,
1961                                            snapdir_smb_fname,
1962                                            &dirfsp);
1963         if (!NT_STATUS_IS_OK(status)) {
1964                 DBG_WARNING("create_internal_dir_fsp() failed for '%s'"
1965                             " - %s\n", snapdir, nt_errstr(status));
1966                 errno = ENOSYS;
1967                 goto done;
1968         }
1969
1970 #ifdef O_DIRECTORY
1971         open_flags |= O_DIRECTORY;
1972 #endif
1973
1974         dirfsp->fh->fd = SMB_VFS_NEXT_OPEN(handle,
1975                                            snapdir_smb_fname,
1976                                            dirfsp,
1977                                            open_flags,
1978                                            0);
1979         if (dirfsp->fh->fd == -1) {
1980                 DBG_WARNING("SMB_VFS_NEXT_OPEN failed for '%s'"
1981                             " - %s\n", snapdir, strerror(errno));
1982                 errno = ENOSYS;
1983                 goto done;
1984         }
1985
1986         p = SMB_VFS_NEXT_FDOPENDIR(handle, dirfsp, NULL, 0);
1987         if (!p) {
1988                 DEBUG(2,("shadow_copy2: SMB_VFS_NEXT_OPENDIR() failed for '%s'"
1989                          " - %s\n", snapdir, strerror(errno)));
1990                 errno = ENOSYS;
1991                 goto done;
1992         }
1993
1994         if (shadow_copy2_data != NULL) {
1995                 shadow_copy2_data->num_volumes = 0;
1996                 shadow_copy2_data->labels      = NULL;
1997         }
1998
1999         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
2000                                 goto done);
2001
2002         /*
2003          * Normally this function is called twice once with labels = false and
2004          * then with labels = true. When labels is false it will return the
2005          * number of volumes so that the caller can allocate memory for that
2006          * many labels. Therefore to eliminate snaplist both the times it is
2007          * good to check if labels is set or not.
2008          *
2009          * shadow_copy2_data is NULL when we only want to update the list and
2010          * don't want any labels.
2011          */
2012         if ((priv->snaps->regex != NULL) && (labels || shadow_copy2_data == NULL)) {
2013                 get_snaplist = true;
2014                 /* Reset the global snaplist */
2015                 shadow_copy2_delete_snaplist(priv);
2016
2017                 /* Set the current time as snaplist update time */
2018                 time(&(priv->snaps->fetch_time));
2019         }
2020
2021         while ((d = SMB_VFS_NEXT_READDIR(handle, p, NULL))) {
2022                 char snapshot[GMT_NAME_LEN+1];
2023                 SHADOW_COPY_LABEL *tlabels;
2024
2025                 /*
2026                  * ignore names not of the right form in the snapshot
2027                  * directory
2028                  */
2029                 if (!shadow_copy2_snapshot_to_gmt(
2030                             handle, d->d_name,
2031                             snapshot, sizeof(snapshot))) {
2032
2033                         DEBUG(6, ("shadow_copy2_get_shadow_copy_data: "
2034                                   "ignoring %s\n", d->d_name));
2035                         continue;
2036                 }
2037                 DEBUG(6,("shadow_copy2_get_shadow_copy_data: %s -> %s\n",
2038                          d->d_name, snapshot));
2039
2040                 if (get_snaplist) {
2041                         /*
2042                          * Create a snap entry for each successful
2043                          * pattern match.
2044                          */
2045                         tmpentry = shadow_copy2_create_snapentry(priv);
2046                         if (tmpentry == NULL) {
2047                                 DBG_ERR("talloc_zero() failed\n");
2048                                 goto done;
2049                         }
2050                         tmpentry->snapname = talloc_strdup(tmpentry, d->d_name);
2051                         tmpentry->time_fmt = talloc_strdup(tmpentry, snapshot);
2052                 }
2053
2054                 if (shadow_copy2_data == NULL) {
2055                         continue;
2056                 }
2057
2058                 if (!labels) {
2059                         /* the caller doesn't want the labels */
2060                         shadow_copy2_data->num_volumes++;
2061                         continue;
2062                 }
2063
2064                 tlabels = talloc_realloc(shadow_copy2_data,
2065                                          shadow_copy2_data->labels,
2066                                          SHADOW_COPY_LABEL,
2067                                          shadow_copy2_data->num_volumes+1);
2068                 if (tlabels == NULL) {
2069                         DEBUG(0,("shadow_copy2: out of memory\n"));
2070                         goto done;
2071                 }
2072
2073                 strlcpy(tlabels[shadow_copy2_data->num_volumes], snapshot,
2074                         sizeof(*tlabels));
2075
2076                 shadow_copy2_data->num_volumes++;
2077                 shadow_copy2_data->labels = tlabels;
2078         }
2079
2080         shadow_copy2_sort_data(handle, shadow_copy2_data);
2081         ret = 0;
2082
2083 done:
2084         if (p != NULL) {
2085                 SMB_VFS_NEXT_CLOSEDIR(handle, p);
2086                 p = NULL;
2087         }
2088         if (dirfsp != NULL) {
2089                 fd_close(dirfsp);
2090                 file_free(NULL, dirfsp);
2091         }
2092         TALLOC_FREE(tmp_ctx);
2093         return ret;
2094 }
2095
2096 static NTSTATUS shadow_copy2_get_nt_acl_at(vfs_handle_struct *handle,
2097                                         struct files_struct *dirfsp,
2098                                         const struct smb_filename *smb_fname,
2099                                         uint32_t security_info,
2100                                         TALLOC_CTX *mem_ctx,
2101                                         struct security_descriptor **ppdesc)
2102 {
2103         time_t timestamp = 0;
2104         char *stripped = NULL;
2105         NTSTATUS status;
2106         char *conv;
2107         struct smb_filename *conv_smb_fname = NULL;
2108
2109         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2110                                         handle,
2111                                         smb_fname,
2112                                         &timestamp,
2113                                         &stripped)) {
2114                 return map_nt_error_from_unix(errno);
2115         }
2116         if (timestamp == 0) {
2117                 return SMB_VFS_NEXT_GET_NT_ACL_AT(handle,
2118                                         dirfsp,
2119                                         smb_fname,
2120                                         security_info,
2121                                         mem_ctx,
2122                                         ppdesc);
2123         }
2124         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2125         TALLOC_FREE(stripped);
2126         if (conv == NULL) {
2127                 return map_nt_error_from_unix(errno);
2128         }
2129         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2130                                         conv,
2131                                         NULL,
2132                                         NULL,
2133                                         0,
2134                                         smb_fname->flags);
2135         if (conv_smb_fname == NULL) {
2136                 TALLOC_FREE(conv);
2137                 return NT_STATUS_NO_MEMORY;
2138         }
2139         status = SMB_VFS_NEXT_GET_NT_ACL_AT(handle,
2140                                         dirfsp,
2141                                         conv_smb_fname,
2142                                         security_info,
2143                                         mem_ctx,
2144                                         ppdesc);
2145         TALLOC_FREE(conv);
2146         TALLOC_FREE(conv_smb_fname);
2147         return status;
2148 }
2149
2150 static int shadow_copy2_mkdirat(vfs_handle_struct *handle,
2151                                 struct files_struct *dirfsp,
2152                                 const struct smb_filename *smb_fname,
2153                                 mode_t mode)
2154 {
2155         time_t timestamp = 0;
2156
2157         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2158                                         handle,
2159                                         smb_fname,
2160                                         &timestamp,
2161                                         NULL)) {
2162                 return -1;
2163         }
2164         if (timestamp != 0) {
2165                 errno = EROFS;
2166                 return -1;
2167         }
2168         return SMB_VFS_NEXT_MKDIRAT(handle,
2169                         dirfsp,
2170                         smb_fname,
2171                         mode);
2172 }
2173
2174 static int shadow_copy2_chflags(vfs_handle_struct *handle,
2175                                 const struct smb_filename *smb_fname,
2176                                 unsigned int flags)
2177 {
2178         time_t timestamp = 0;
2179
2180         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2181                                         handle,
2182                                         smb_fname,
2183                                         &timestamp,
2184                                         NULL)) {
2185                 return -1;
2186         }
2187         if (timestamp != 0) {
2188                 errno = EROFS;
2189                 return -1;
2190         }
2191         return SMB_VFS_NEXT_CHFLAGS(handle, smb_fname, flags);
2192 }
2193
2194 static ssize_t shadow_copy2_getxattr(vfs_handle_struct *handle,
2195                                 const struct smb_filename *smb_fname,
2196                                 const char *aname,
2197                                 void *value,
2198                                 size_t size)
2199 {
2200         time_t timestamp = 0;
2201         char *stripped = NULL;
2202         ssize_t ret;
2203         int saved_errno = 0;
2204         char *conv;
2205         struct smb_filename *conv_smb_fname = NULL;
2206
2207         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2208                                 handle,
2209                                 smb_fname,
2210                                 &timestamp,
2211                                 &stripped)) {
2212                 return -1;
2213         }
2214         if (timestamp == 0) {
2215                 return SMB_VFS_NEXT_GETXATTR(handle, smb_fname, aname, value,
2216                                              size);
2217         }
2218         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2219         TALLOC_FREE(stripped);
2220         if (conv == NULL) {
2221                 return -1;
2222         }
2223
2224         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2225                                         conv,
2226                                         NULL,
2227                                         NULL,
2228                                         0,
2229                                         smb_fname->flags);
2230         if (conv_smb_fname == NULL) {
2231                 TALLOC_FREE(conv);
2232                 return -1;
2233         }
2234
2235         ret = SMB_VFS_NEXT_GETXATTR(handle, conv_smb_fname, aname, value, size);
2236         if (ret == -1) {
2237                 saved_errno = errno;
2238         }
2239         TALLOC_FREE(conv_smb_fname);
2240         TALLOC_FREE(conv);
2241         if (saved_errno != 0) {
2242                 errno = saved_errno;
2243         }
2244         return ret;
2245 }
2246
2247 static ssize_t shadow_copy2_listxattr(struct vfs_handle_struct *handle,
2248                                       const struct smb_filename *smb_fname,
2249                                       char *list, size_t size)
2250 {
2251         time_t timestamp = 0;
2252         char *stripped = NULL;
2253         ssize_t ret;
2254         int saved_errno = 0;
2255         char *conv;
2256         struct smb_filename *conv_smb_fname = NULL;
2257
2258         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2259                                 handle,
2260                                 smb_fname,
2261                                 &timestamp,
2262                                 &stripped)) {
2263                 return -1;
2264         }
2265         if (timestamp == 0) {
2266                 return SMB_VFS_NEXT_LISTXATTR(handle, smb_fname, list, size);
2267         }
2268         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2269         TALLOC_FREE(stripped);
2270         if (conv == NULL) {
2271                 return -1;
2272         }
2273         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2274                                         conv,
2275                                         NULL,
2276                                         NULL,
2277                                         0,
2278                                         smb_fname->flags);
2279         if (conv_smb_fname == NULL) {
2280                 TALLOC_FREE(conv);
2281                 return -1;
2282         }
2283         ret = SMB_VFS_NEXT_LISTXATTR(handle, conv_smb_fname, list, size);
2284         if (ret == -1) {
2285                 saved_errno = errno;
2286         }
2287         TALLOC_FREE(conv_smb_fname);
2288         TALLOC_FREE(conv);
2289         if (saved_errno != 0) {
2290                 errno = saved_errno;
2291         }
2292         return ret;
2293 }
2294
2295 static int shadow_copy2_removexattr(vfs_handle_struct *handle,
2296                                 const struct smb_filename *smb_fname,
2297                                 const char *aname)
2298 {
2299         time_t timestamp = 0;
2300
2301         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2302                                 handle,
2303                                 smb_fname,
2304                                 &timestamp,
2305                                 NULL)) {
2306                 return -1;
2307         }
2308         if (timestamp != 0) {
2309                 errno = EROFS;
2310                 return -1;
2311         }
2312         return SMB_VFS_NEXT_REMOVEXATTR(handle, smb_fname, aname);
2313 }
2314
2315 static int shadow_copy2_setxattr(struct vfs_handle_struct *handle,
2316                                  const struct smb_filename *smb_fname,
2317                                  const char *aname, const void *value,
2318                                  size_t size, int flags)
2319 {
2320         time_t timestamp = 0;
2321
2322         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2323                                 handle,
2324                                 smb_fname,
2325                                 &timestamp,
2326                                 NULL)) {
2327                 return -1;
2328         }
2329         if (timestamp != 0) {
2330                 errno = EROFS;
2331                 return -1;
2332         }
2333         return SMB_VFS_NEXT_SETXATTR(handle, smb_fname,
2334                                 aname, value, size, flags);
2335 }
2336
2337 static NTSTATUS shadow_copy2_create_dfs_pathat(struct vfs_handle_struct *handle,
2338                                 struct files_struct *dirfsp,
2339                                 const struct smb_filename *smb_fname,
2340                                 const struct referral *reflist,
2341                                 size_t referral_count)
2342 {
2343         time_t timestamp = 0;
2344
2345         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2346                                         handle,
2347                                         smb_fname,
2348                                         &timestamp,
2349                                         NULL)) {
2350                 return NT_STATUS_NO_MEMORY;
2351         }
2352         if (timestamp != 0) {
2353                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
2354         }
2355         return SMB_VFS_NEXT_CREATE_DFS_PATHAT(handle,
2356                         dirfsp,
2357                         smb_fname,
2358                         reflist,
2359                         referral_count);
2360 }
2361
2362 static NTSTATUS shadow_copy2_read_dfs_pathat(struct vfs_handle_struct *handle,
2363                                 TALLOC_CTX *mem_ctx,
2364                                 struct files_struct *dirfsp,
2365                                 const struct smb_filename *smb_fname,
2366                                 struct referral **ppreflist,
2367                                 size_t *preferral_count)
2368 {
2369         time_t timestamp = 0;
2370         char *stripped = NULL;
2371         struct smb_filename *conv = NULL;
2372         NTSTATUS status;
2373
2374         if (!shadow_copy2_strip_snapshot(mem_ctx,
2375                                         handle,
2376                                         smb_fname,
2377                                         &timestamp,
2378                                         &stripped)) {
2379                 return NT_STATUS_NO_MEMORY;
2380         }
2381         if (timestamp == 0) {
2382                 return SMB_VFS_NEXT_READ_DFS_PATHAT(handle,
2383                                         mem_ctx,
2384                                         dirfsp,
2385                                         smb_fname,
2386                                         ppreflist,
2387                                         preferral_count);
2388         }
2389
2390         conv = cp_smb_filename(mem_ctx, smb_fname);
2391         if (conv == NULL) {
2392                 TALLOC_FREE(stripped);
2393                 return NT_STATUS_NO_MEMORY;
2394         }
2395         conv->base_name = shadow_copy2_convert(conv,
2396                                         handle,
2397                                         stripped,
2398                                         timestamp);
2399         TALLOC_FREE(stripped);
2400         if (conv->base_name == NULL) {
2401                 TALLOC_FREE(conv);
2402                 return NT_STATUS_NO_MEMORY;
2403         }
2404
2405         status = SMB_VFS_NEXT_READ_DFS_PATHAT(handle,
2406                                 mem_ctx,
2407                                 dirfsp,
2408                                 conv,
2409                                 ppreflist,
2410                                 preferral_count);
2411
2412         TALLOC_FREE(conv);
2413         return status;
2414 }
2415
2416 static int shadow_copy2_get_real_filename(struct vfs_handle_struct *handle,
2417                                           const struct smb_filename *fname,
2418                                           const char *name,
2419                                           TALLOC_CTX *mem_ctx,
2420                                           char **found_name)
2421 {
2422         struct shadow_copy2_private *priv = NULL;
2423         struct shadow_copy2_config *config = NULL;
2424         time_t timestamp = 0;
2425         char *stripped = NULL;
2426         ssize_t ret;
2427         int saved_errno = 0;
2428         char *conv;
2429         struct smb_filename conv_fname;
2430
2431         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
2432                                 return -1);
2433         config = priv->config;
2434
2435         DBG_DEBUG("Path=[%s] name=[%s]\n", smb_fname_str_dbg(fname), name);
2436
2437         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
2438                                          &timestamp, &stripped)) {
2439                 DEBUG(10, ("shadow_copy2_strip_snapshot failed\n"));
2440                 return -1;
2441         }
2442         if (timestamp == 0) {
2443                 DEBUG(10, ("timestamp == 0\n"));
2444                 return SMB_VFS_NEXT_GET_REAL_FILENAME(handle, fname, name,
2445                                                       mem_ctx, found_name);
2446         }
2447
2448         /*
2449          * Note that stripped may be an empty string "" if path was ".". As
2450          * shadow_copy2_convert() combines "" with the shadow-copy tree connect
2451          * root fullpath and get_real_filename_full_scan() has an explicit check
2452          * for "" this works.
2453          */
2454         DBG_DEBUG("stripped [%s]\n", stripped);
2455
2456         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2457         if (conv == NULL) {
2458                 if (!config->snapdirseverywhere) {
2459                         DBG_DEBUG("shadow_copy2_convert [%s] failed\n", stripped);
2460                         return -1;
2461                 }
2462
2463                 /*
2464                  * We're called in the path traversal loop in unix_convert()
2465                  * walking down the directory hierarchy. shadow_copy2_convert()
2466                  * will fail if the snapshot directory is futher down in the
2467                  * hierachy. Set conv to the original stripped path and try to
2468                  * look it up in the filesystem with
2469                  * SMB_VFS_NEXT_GET_REAL_FILENAME() or
2470                  * get_real_filename_full_scan().
2471                  */
2472                 DBG_DEBUG("Use stripped [%s] as conv\n", stripped);
2473                 conv = talloc_strdup(talloc_tos(), stripped);
2474                 if (conv == NULL) {
2475                         TALLOC_FREE(stripped);
2476                         return -1;
2477                 }
2478         }
2479
2480         conv_fname = (struct smb_filename) {
2481                 .base_name = conv,
2482         };
2483
2484         DEBUG(10, ("Calling NEXT_GET_REAL_FILE_NAME for conv=[%s], "
2485                    "name=[%s]\n", conv, name));
2486         ret = SMB_VFS_NEXT_GET_REAL_FILENAME(handle, &conv_fname, name,
2487                                              mem_ctx, found_name);
2488         DEBUG(10, ("NEXT_REAL_FILE_NAME returned %d\n", (int)ret));
2489         if (ret == 0) {
2490                 return 0;
2491         }
2492         if (errno != EOPNOTSUPP) {
2493                 TALLOC_FREE(conv);
2494                 errno = EOPNOTSUPP;
2495                 return -1;
2496         }
2497
2498         ret = get_real_filename_full_scan(handle->conn,
2499                                           conv,
2500                                           name,
2501                                           false,
2502                                           mem_ctx,
2503                                           found_name);
2504         if (ret != 0) {
2505                 saved_errno = errno;
2506                 DBG_DEBUG("Scan [%s] for [%s] failed\n",
2507                           conv, name);
2508                 errno = saved_errno;
2509                 return -1;
2510         }
2511
2512         DBG_DEBUG("Scan [%s] for [%s] returned [%s]\n",
2513                   conv, name, *found_name);
2514
2515         TALLOC_FREE(conv);
2516         return 0;
2517 }
2518
2519 static const char *shadow_copy2_connectpath(struct vfs_handle_struct *handle,
2520                                         const struct smb_filename *smb_fname_in)
2521 {
2522         time_t timestamp = 0;
2523         char *stripped = NULL;
2524         char *tmp = NULL;
2525         const char *fname = smb_fname_in->base_name;
2526         struct smb_filename smb_fname = {0};
2527         struct smb_filename *result_fname = NULL;
2528         char *result = NULL;
2529         char *parent_dir = NULL;
2530         int saved_errno = 0;
2531         size_t rootpath_len = 0;
2532         struct shadow_copy2_private *priv = NULL;
2533
2534         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
2535                                 return NULL);
2536
2537         DBG_DEBUG("Calc connect path for [%s]\n", fname);
2538
2539         if (priv->shadow_connectpath != NULL) {
2540                 DBG_DEBUG("cached connect path is [%s]\n",
2541                         priv->shadow_connectpath);
2542                 return priv->shadow_connectpath;
2543         }
2544
2545         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, smb_fname_in,
2546                                          &timestamp, &stripped)) {
2547                 goto done;
2548         }
2549         if (timestamp == 0) {
2550                 return SMB_VFS_NEXT_CONNECTPATH(handle, smb_fname_in);
2551         }
2552
2553         tmp = shadow_copy2_do_convert(talloc_tos(), handle, stripped, timestamp,
2554                                       &rootpath_len);
2555         if (tmp == NULL) {
2556                 if (errno != ENOENT) {
2557                         goto done;
2558                 }
2559
2560                 /*
2561                  * If the converted path does not exist, and converting
2562                  * the parent yields something that does exist, then
2563                  * this path refers to something that has not been
2564                  * created yet, relative to the parent path.
2565                  * The snapshot finding is relative to the parent.
2566                  * (usually snapshots are read/only but this is not
2567                  * necessarily true).
2568                  * This code also covers getting a wildcard in the
2569                  * last component, because this function is called
2570                  * prior to sanitizing the path, and in SMB1 we may
2571                  * get wildcards in path names.
2572                  */
2573                 if (!parent_dirname(talloc_tos(), stripped, &parent_dir,
2574                                     NULL)) {
2575                         errno = ENOMEM;
2576                         goto done;
2577                 }
2578
2579                 tmp = shadow_copy2_do_convert(talloc_tos(), handle, parent_dir,
2580                                               timestamp, &rootpath_len);
2581                 if (tmp == NULL) {
2582                         goto done;
2583                 }
2584         }
2585
2586         DBG_DEBUG("converted path is [%s] root path is [%.*s]\n", tmp,
2587                   (int)rootpath_len, tmp);
2588
2589         tmp[rootpath_len] = '\0';
2590         smb_fname = (struct smb_filename) { .base_name = tmp };
2591
2592         result_fname = SMB_VFS_NEXT_REALPATH(handle, priv, &smb_fname);
2593         if (result_fname == NULL) {
2594                 goto done;
2595         }
2596
2597         /*
2598          * SMB_VFS_NEXT_REALPATH returns a talloc'ed string.
2599          * Don't leak memory.
2600          */
2601         TALLOC_FREE(priv->shadow_realpath);
2602         priv->shadow_realpath = result_fname;
2603         result = priv->shadow_realpath->base_name;
2604
2605         DBG_DEBUG("connect path is [%s]\n", result);
2606
2607 done:
2608         if (result == NULL) {
2609                 saved_errno = errno;
2610         }
2611         TALLOC_FREE(tmp);
2612         TALLOC_FREE(stripped);
2613         TALLOC_FREE(parent_dir);
2614         if (saved_errno != 0) {
2615                 errno = saved_errno;
2616         }
2617         return result;
2618 }
2619
2620 static uint64_t shadow_copy2_disk_free(vfs_handle_struct *handle,
2621                                 const struct smb_filename *smb_fname,
2622                                 uint64_t *bsize,
2623                                 uint64_t *dfree,
2624                                 uint64_t *dsize)
2625 {
2626         time_t timestamp = 0;
2627         char *stripped = NULL;
2628         int saved_errno = 0;
2629         char *conv = NULL;
2630         struct smb_filename *conv_smb_fname = NULL;
2631         uint64_t ret = (uint64_t)-1;
2632
2633         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2634                                 handle,
2635                                 smb_fname,
2636                                 &timestamp,
2637                                 &stripped)) {
2638                 return (uint64_t)-1;
2639         }
2640         if (timestamp == 0) {
2641                 return SMB_VFS_NEXT_DISK_FREE(handle, smb_fname,
2642                                               bsize, dfree, dsize);
2643         }
2644         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2645         TALLOC_FREE(stripped);
2646         if (conv == NULL) {
2647                 return (uint64_t)-1;
2648         }
2649         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2650                                         conv,
2651                                         NULL,
2652                                         NULL,
2653                                         0,
2654                                         smb_fname->flags);
2655         if (conv_smb_fname == NULL) {
2656                 TALLOC_FREE(conv);
2657                 return (uint64_t)-1;
2658         }
2659         ret = SMB_VFS_NEXT_DISK_FREE(handle, conv_smb_fname,
2660                                 bsize, dfree, dsize);
2661         if (ret == (uint64_t)-1) {
2662                 saved_errno = errno;
2663         }
2664         TALLOC_FREE(conv);
2665         TALLOC_FREE(conv_smb_fname);
2666         if (saved_errno != 0) {
2667                 errno = saved_errno;
2668         }
2669         return ret;
2670 }
2671
2672 static int shadow_copy2_get_quota(vfs_handle_struct *handle,
2673                                 const struct smb_filename *smb_fname,
2674                                 enum SMB_QUOTA_TYPE qtype,
2675                                 unid_t id,
2676                                 SMB_DISK_QUOTA *dq)
2677 {
2678         time_t timestamp = 0;
2679         char *stripped = NULL;
2680         int ret;
2681         int saved_errno = 0;
2682         char *conv;
2683         struct smb_filename *conv_smb_fname = NULL;
2684
2685         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2686                                 handle,
2687                                 smb_fname,
2688                                 &timestamp,
2689                                 &stripped)) {
2690                 return -1;
2691         }
2692         if (timestamp == 0) {
2693                 return SMB_VFS_NEXT_GET_QUOTA(handle, smb_fname, qtype, id, dq);
2694         }
2695
2696         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2697         TALLOC_FREE(stripped);
2698         if (conv == NULL) {
2699                 return -1;
2700         }
2701         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2702                                         conv,
2703                                         NULL,
2704                                         NULL,
2705                                         0,
2706                                         smb_fname->flags);
2707         if (conv_smb_fname == NULL) {
2708                 TALLOC_FREE(conv);
2709                 return -1;
2710         }
2711         ret = SMB_VFS_NEXT_GET_QUOTA(handle, conv_smb_fname, qtype, id, dq);
2712
2713         if (ret == -1) {
2714                 saved_errno = errno;
2715         }
2716         TALLOC_FREE(conv);
2717         TALLOC_FREE(conv_smb_fname);
2718         if (saved_errno != 0) {
2719                 errno = saved_errno;
2720         }
2721
2722         return ret;
2723 }
2724
2725 static ssize_t shadow_copy2_pwrite(vfs_handle_struct *handle,
2726                                    files_struct *fsp,
2727                                    const void *data,
2728                                    size_t n,
2729                                    off_t offset)
2730 {
2731         ssize_t nwritten;
2732
2733         nwritten = SMB_VFS_NEXT_PWRITE(handle, fsp, data, n, offset);
2734         if (nwritten == -1) {
2735                 if (errno == EBADF && fsp->fsp_flags.can_write) {
2736                         errno = EROFS;
2737                 }
2738         }
2739
2740         return nwritten;
2741 }
2742
2743 struct shadow_copy2_pwrite_state {
2744         vfs_handle_struct *handle;
2745         files_struct *fsp;
2746         ssize_t ret;
2747         struct vfs_aio_state vfs_aio_state;
2748 };
2749
2750 static void shadow_copy2_pwrite_done(struct tevent_req *subreq);
2751
2752 static struct tevent_req *shadow_copy2_pwrite_send(
2753         struct vfs_handle_struct *handle, TALLOC_CTX *mem_ctx,
2754         struct tevent_context *ev, struct files_struct *fsp,
2755         const void *data, size_t n, off_t offset)
2756 {
2757         struct tevent_req *req = NULL, *subreq = NULL;
2758         struct shadow_copy2_pwrite_state *state = NULL;
2759
2760         req = tevent_req_create(mem_ctx, &state,
2761                                 struct shadow_copy2_pwrite_state);
2762         if (req == NULL) {
2763                 return NULL;
2764         }
2765         state->handle = handle;
2766         state->fsp = fsp;
2767
2768         subreq = SMB_VFS_NEXT_PWRITE_SEND(state,
2769                                           ev,
2770                                           handle,
2771                                           fsp,
2772                                           data,
2773                                           n,
2774                                           offset);
2775         if (tevent_req_nomem(subreq, req)) {
2776                 return tevent_req_post(req, ev);
2777         }
2778         tevent_req_set_callback(subreq, shadow_copy2_pwrite_done, req);
2779
2780         return req;
2781 }
2782
2783 static void shadow_copy2_pwrite_done(struct tevent_req *subreq)
2784 {
2785         struct tevent_req *req = tevent_req_callback_data(
2786                 subreq, struct tevent_req);
2787         struct shadow_copy2_pwrite_state *state = tevent_req_data(
2788                 req, struct shadow_copy2_pwrite_state);
2789
2790         state->ret = SMB_VFS_PWRITE_RECV(subreq, &state->vfs_aio_state);
2791         TALLOC_FREE(subreq);
2792         if (state->ret == -1) {
2793                 tevent_req_error(req, state->vfs_aio_state.error);
2794                 return;
2795         }
2796
2797         tevent_req_done(req);
2798 }
2799
2800 static ssize_t shadow_copy2_pwrite_recv(struct tevent_req *req,
2801                                           struct vfs_aio_state *vfs_aio_state)
2802 {
2803         struct shadow_copy2_pwrite_state *state = tevent_req_data(
2804                 req, struct shadow_copy2_pwrite_state);
2805
2806         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
2807                 if ((vfs_aio_state->error == EBADF) &&
2808                     state->fsp->fsp_flags.can_write)
2809                 {
2810                         vfs_aio_state->error = EROFS;
2811                         errno = EROFS;
2812                 }
2813                 return -1;
2814         }
2815
2816         *vfs_aio_state = state->vfs_aio_state;
2817         return state->ret;
2818 }
2819
2820 static int shadow_copy2_connect(struct vfs_handle_struct *handle,
2821                                 const char *service, const char *user)
2822 {
2823         struct shadow_copy2_config *config;
2824         struct shadow_copy2_private *priv;
2825         int ret;
2826         const char *snapdir;
2827         const char *snapprefix = NULL;
2828         const char *delimiter;
2829         const char *gmt_format;
2830         const char *sort_order;
2831         const char *basedir = NULL;
2832         const char *snapsharepath = NULL;
2833         const char *mount_point;
2834
2835         DEBUG(10, (__location__ ": cnum[%u], connectpath[%s]\n",
2836                    (unsigned)handle->conn->cnum,
2837                    handle->conn->connectpath));
2838
2839         ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
2840         if (ret < 0) {
2841                 return ret;
2842         }
2843
2844         priv = talloc_zero(handle->conn, struct shadow_copy2_private);
2845         if (priv == NULL) {
2846                 DBG_ERR("talloc_zero() failed\n");
2847                 errno = ENOMEM;
2848                 return -1;
2849         }
2850
2851         priv->snaps = talloc_zero(priv, struct shadow_copy2_snaplist_info);
2852         if (priv->snaps == NULL) {
2853                 DBG_ERR("talloc_zero() failed\n");
2854                 errno = ENOMEM;
2855                 return -1;
2856         }
2857
2858         config = talloc_zero(priv, struct shadow_copy2_config);
2859         if (config == NULL) {
2860                 DEBUG(0, ("talloc_zero() failed\n"));
2861                 errno = ENOMEM;
2862                 return -1;
2863         }
2864
2865         priv->config = config;
2866
2867         gmt_format = lp_parm_const_string(SNUM(handle->conn),
2868                                           "shadow", "format",
2869                                           GMT_FORMAT);
2870         config->gmt_format = talloc_strdup(config, gmt_format);
2871         if (config->gmt_format == NULL) {
2872                 DEBUG(0, ("talloc_strdup() failed\n"));
2873                 errno = ENOMEM;
2874                 return -1;
2875         }
2876
2877         /* config->gmt_format must not contain a path separator. */
2878         if (strchr(config->gmt_format, '/') != NULL) {
2879                 DEBUG(0, ("shadow:format %s must not contain a /"
2880                         "character. Unable to initialize module.\n",
2881                         config->gmt_format));
2882                 errno = EINVAL;
2883                 return -1;
2884         }
2885
2886         config->use_sscanf = lp_parm_bool(SNUM(handle->conn),
2887                                           "shadow", "sscanf", false);
2888
2889         config->use_localtime = lp_parm_bool(SNUM(handle->conn),
2890                                              "shadow", "localtime",
2891                                              false);
2892
2893         snapdir = lp_parm_const_string(SNUM(handle->conn),
2894                                        "shadow", "snapdir",
2895                                        ".snapshots");
2896         config->snapdir = talloc_strdup(config, snapdir);
2897         if (config->snapdir == NULL) {
2898                 DEBUG(0, ("talloc_strdup() failed\n"));
2899                 errno = ENOMEM;
2900                 return -1;
2901         }
2902
2903         snapprefix = lp_parm_const_string(SNUM(handle->conn),
2904                                        "shadow", "snapprefix",
2905                                        NULL);
2906         if (snapprefix != NULL) {
2907                 priv->snaps->regex = talloc_zero(priv->snaps, regex_t);
2908                 if (priv->snaps->regex == NULL) {
2909                         DBG_ERR("talloc_zero() failed\n");
2910                         errno = ENOMEM;
2911                         return -1;
2912                 }
2913
2914                 /* pre-compute regex rule for matching pattern later */
2915                 ret = regcomp(priv->snaps->regex, snapprefix, 0);
2916                 if (ret) {
2917                         DBG_ERR("Failed to create regex object\n");
2918                         return -1;
2919                 }
2920         }
2921
2922         delimiter = lp_parm_const_string(SNUM(handle->conn),
2923                                        "shadow", "delimiter",
2924                                        "_GMT");
2925         if (delimiter != NULL) {
2926                 priv->config->delimiter = talloc_strdup(priv->config, delimiter);
2927                 if (priv->config->delimiter == NULL) {
2928                         DBG_ERR("talloc_strdup() failed\n");
2929                         errno = ENOMEM;
2930                         return -1;
2931                 }
2932         }
2933
2934         config->snapdirseverywhere = lp_parm_bool(SNUM(handle->conn),
2935                                                   "shadow",
2936                                                   "snapdirseverywhere",
2937                                                   false);
2938
2939         config->crossmountpoints = lp_parm_bool(SNUM(handle->conn),
2940                                                 "shadow", "crossmountpoints",
2941                                                 false);
2942
2943         if (config->crossmountpoints && !config->snapdirseverywhere) {
2944                 DBG_WARNING("Warning: 'crossmountpoints' depends on "
2945                             "'snapdirseverywhere'. Disabling crossmountpoints.\n");
2946         }
2947
2948         config->fixinodes = lp_parm_bool(SNUM(handle->conn),
2949                                          "shadow", "fixinodes",
2950                                          false);
2951
2952         sort_order = lp_parm_const_string(SNUM(handle->conn),
2953                                           "shadow", "sort", "desc");
2954         config->sort_order = talloc_strdup(config, sort_order);
2955         if (config->sort_order == NULL) {
2956                 DEBUG(0, ("talloc_strdup() failed\n"));
2957                 errno = ENOMEM;
2958                 return -1;
2959         }
2960
2961         mount_point = lp_parm_const_string(SNUM(handle->conn),
2962                                            "shadow", "mountpoint", NULL);
2963         if (mount_point != NULL) {
2964                 if (mount_point[0] != '/') {
2965                         DEBUG(1, (__location__ " Warning: 'mountpoint' is "
2966                                   "relative ('%s'), but it has to be an "
2967                                   "absolute path. Ignoring provided value.\n",
2968                                   mount_point));
2969                         mount_point = NULL;
2970                 } else {
2971                         char *p;
2972                         p = strstr(handle->conn->connectpath, mount_point);
2973                         if (p != handle->conn->connectpath) {
2974                                 DBG_WARNING("Warning: the share root (%s) is "
2975                                             "not a subdirectory of the "
2976                                             "specified mountpoint (%s). "
2977                                             "Ignoring provided value.\n",
2978                                             handle->conn->connectpath,
2979                                             mount_point);
2980                                 mount_point = NULL;
2981                         }
2982                 }
2983         }
2984
2985         if (mount_point != NULL) {
2986                 config->mount_point = talloc_strdup(config, mount_point);
2987                 if (config->mount_point == NULL) {
2988                         DEBUG(0, (__location__ " talloc_strdup() failed\n"));
2989                         return -1;
2990                 }
2991         } else {
2992                 config->mount_point = shadow_copy2_find_mount_point(config,
2993                                                                     handle);
2994                 if (config->mount_point == NULL) {
2995                         DBG_WARNING("shadow_copy2_find_mount_point "
2996                                     "of the share root '%s' failed: %s\n",
2997                                     handle->conn->connectpath, strerror(errno));
2998                         return -1;
2999                 }
3000         }
3001
3002         basedir = lp_parm_const_string(SNUM(handle->conn),
3003                                        "shadow", "basedir", NULL);
3004
3005         if (basedir != NULL) {
3006                 if (basedir[0] != '/') {
3007                         DEBUG(1, (__location__ " Warning: 'basedir' is "
3008                                   "relative ('%s'), but it has to be an "
3009                                   "absolute path. Disabling basedir.\n",
3010                                   basedir));
3011                         basedir = NULL;
3012                 } else {
3013                         char *p;
3014                         p = strstr(basedir, config->mount_point);
3015                         if (p != basedir) {
3016                                 DEBUG(1, ("Warning: basedir (%s) is not a "
3017                                           "subdirectory of the share root's "
3018                                           "mount point (%s). "
3019                                           "Disabling basedir\n",
3020                                           basedir, config->mount_point));
3021                                 basedir = NULL;
3022                         }
3023                 }
3024         }
3025
3026         if (config->snapdirseverywhere && basedir != NULL) {
3027                 DEBUG(1, (__location__ " Warning: 'basedir' is incompatible "
3028                           "with 'snapdirseverywhere'. Disabling basedir.\n"));
3029                 basedir = NULL;
3030         }
3031
3032         snapsharepath = lp_parm_const_string(SNUM(handle->conn), "shadow",
3033                                              "snapsharepath", NULL);
3034         if (snapsharepath != NULL) {
3035                 if (snapsharepath[0] == '/') {
3036                         DBG_WARNING("Warning: 'snapsharepath' is "
3037                                     "absolute ('%s'), but it has to be a "
3038                                     "relative path. Disabling snapsharepath.\n",
3039                                     snapsharepath);
3040                         snapsharepath = NULL;
3041                 }
3042                 if (config->snapdirseverywhere && snapsharepath != NULL) {
3043                         DBG_WARNING("Warning: 'snapsharepath' is incompatible "
3044                                     "with 'snapdirseverywhere'. Disabling "
3045                                     "snapsharepath.\n");
3046                         snapsharepath = NULL;
3047                 }
3048         }
3049
3050         if (basedir != NULL && snapsharepath != NULL) {
3051                 DBG_WARNING("Warning: 'snapsharepath' is incompatible with "
3052                             "'basedir'. Disabling snapsharepath\n");
3053                 snapsharepath = NULL;
3054         }
3055
3056         if (snapsharepath != NULL) {
3057                 config->rel_connectpath = talloc_strdup(config, snapsharepath);
3058                 if (config->rel_connectpath == NULL) {
3059                         DBG_ERR("talloc_strdup() failed\n");
3060                         errno = ENOMEM;
3061                         return -1;
3062                 }
3063         }
3064
3065         if (basedir == NULL) {
3066                 basedir = config->mount_point;
3067         }
3068
3069         if (config->rel_connectpath == NULL &&
3070             strlen(basedir) < strlen(handle->conn->connectpath)) {
3071                 config->rel_connectpath = talloc_strdup(config,
3072                         handle->conn->connectpath + strlen(basedir));
3073                 if (config->rel_connectpath == NULL) {
3074                         DEBUG(0, ("talloc_strdup() failed\n"));
3075                         errno = ENOMEM;
3076                         return -1;
3077                 }
3078         }
3079
3080         if (config->snapdir[0] == '/') {
3081                 config->snapdir_absolute = true;
3082
3083                 if (config->snapdirseverywhere == true) {
3084                         DEBUG(1, (__location__ " Warning: An absolute snapdir "
3085                                   "is incompatible with 'snapdirseverywhere', "
3086                                   "setting 'snapdirseverywhere' to false.\n"));
3087                         config->snapdirseverywhere = false;
3088                 }
3089
3090                 if (config->crossmountpoints == true) {
3091                         DEBUG(1, (__location__ " Warning: 'crossmountpoints' "
3092                                   "is not supported with an absolute snapdir. "
3093                                   "Disabling it.\n"));
3094                         config->crossmountpoints = false;
3095                 }
3096
3097                 config->snapshot_basepath = config->snapdir;
3098         } else {
3099                 config->snapshot_basepath = talloc_asprintf(config, "%s/%s",
3100                                 config->mount_point, config->snapdir);
3101                 if (config->snapshot_basepath == NULL) {
3102                         DEBUG(0, ("talloc_asprintf() failed\n"));
3103                         errno = ENOMEM;
3104                         return -1;
3105                 }
3106         }
3107
3108         trim_string(config->mount_point, NULL, "/");
3109         trim_string(config->rel_connectpath, "/", "/");
3110         trim_string(config->snapdir, NULL, "/");
3111         trim_string(config->snapshot_basepath, NULL, "/");
3112
3113         DEBUG(10, ("shadow_copy2_connect: configuration:\n"
3114                    "  share root: '%s'\n"
3115                    "  mountpoint: '%s'\n"
3116                    "  rel share root: '%s'\n"
3117                    "  snapdir: '%s'\n"
3118                    "  snapprefix: '%s'\n"
3119                    "  delimiter: '%s'\n"
3120                    "  snapshot base path: '%s'\n"
3121                    "  format: '%s'\n"
3122                    "  use sscanf: %s\n"
3123                    "  snapdirs everywhere: %s\n"
3124                    "  cross mountpoints: %s\n"
3125                    "  fix inodes: %s\n"
3126                    "  sort order: %s\n"
3127                    "",
3128                    handle->conn->connectpath,
3129                    config->mount_point,
3130                    config->rel_connectpath,
3131                    config->snapdir,
3132                    snapprefix,
3133                    config->delimiter,
3134                    config->snapshot_basepath,
3135                    config->gmt_format,
3136                    config->use_sscanf ? "yes" : "no",
3137                    config->snapdirseverywhere ? "yes" : "no",
3138                    config->crossmountpoints ? "yes" : "no",
3139                    config->fixinodes ? "yes" : "no",
3140                    config->sort_order
3141                    ));
3142
3143
3144         SMB_VFS_HANDLE_SET_DATA(handle, priv,
3145                                 NULL, struct shadow_copy2_private,
3146                                 return -1);
3147
3148         return 0;
3149 }
3150
3151 static struct vfs_fn_pointers vfs_shadow_copy2_fns = {
3152         .connect_fn = shadow_copy2_connect,
3153         .disk_free_fn = shadow_copy2_disk_free,
3154         .get_quota_fn = shadow_copy2_get_quota,
3155         .create_dfs_pathat_fn = shadow_copy2_create_dfs_pathat,
3156         .read_dfs_pathat_fn = shadow_copy2_read_dfs_pathat,
3157         .renameat_fn = shadow_copy2_renameat,
3158         .linkat_fn = shadow_copy2_linkat,
3159         .symlinkat_fn = shadow_copy2_symlinkat,
3160         .stat_fn = shadow_copy2_stat,
3161         .lstat_fn = shadow_copy2_lstat,
3162         .fstat_fn = shadow_copy2_fstat,
3163         .open_fn = shadow_copy2_open,
3164         .unlinkat_fn = shadow_copy2_unlinkat,
3165         .chmod_fn = shadow_copy2_chmod,
3166         .chdir_fn = shadow_copy2_chdir,
3167         .ntimes_fn = shadow_copy2_ntimes,
3168         .readlinkat_fn = shadow_copy2_readlinkat,
3169         .mknodat_fn = shadow_copy2_mknodat,
3170         .realpath_fn = shadow_copy2_realpath,
3171         .get_nt_acl_at_fn = shadow_copy2_get_nt_acl_at,
3172         .get_shadow_copy_data_fn = shadow_copy2_get_shadow_copy_data,
3173         .mkdirat_fn = shadow_copy2_mkdirat,
3174         .getxattr_fn = shadow_copy2_getxattr,
3175         .getxattrat_send_fn = vfs_not_implemented_getxattrat_send,
3176         .getxattrat_recv_fn = vfs_not_implemented_getxattrat_recv,
3177         .listxattr_fn = shadow_copy2_listxattr,
3178         .removexattr_fn = shadow_copy2_removexattr,
3179         .setxattr_fn = shadow_copy2_setxattr,
3180         .chflags_fn = shadow_copy2_chflags,
3181         .get_real_filename_fn = shadow_copy2_get_real_filename,
3182         .pwrite_fn = shadow_copy2_pwrite,
3183         .pwrite_send_fn = shadow_copy2_pwrite_send,
3184         .pwrite_recv_fn = shadow_copy2_pwrite_recv,
3185         .connectpath_fn = shadow_copy2_connectpath,
3186 };
3187
3188 static_decl_vfs;
3189 NTSTATUS vfs_shadow_copy2_init(TALLOC_CTX *ctx)
3190 {
3191         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION,
3192                                 "shadow_copy2", &vfs_shadow_copy2_fns);
3193 }