source3/modules/vfs_shadow_copy2.c

   1 /*
   2  * shadow_copy2: a shadow copy module (second implementation)
   3  *
   4  * Copyright (C) Andrew Tridgell   2007 (portions taken from shadow_copy2)
   5  * Copyright (C) Ed Plese          2009
   6  * Copyright (C) Volker Lendecke   2011
   7  * Copyright (C) Christian Ambach  2011
   8  * Copyright (C) Michael Adam      2013
   9  * Copyright (C) Rajesh Joseph     2016
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24  */
  25
  26 /*
  27  * This is a second implemetation of a shadow copy module for exposing
  28  * file system snapshots to windows clients as shadow copies.
  29  *
  30  * See the manual page for documentation.
  31  */
  32
  33 #include "includes.h"
  34 #include "smbd/smbd.h"
  35 #include "system/filesys.h"
  36 #include "include/ntioctl.h"
  37 #include "util_tdb.h"
  38 #include "lib/util_path.h"
  39 #include "libcli/security/security.h"
  40 #include "lib/util/tevent_unix.h"
  41
  42 struct shadow_copy2_config {
  43         char *gmt_format;
  44         bool use_sscanf;
  45         bool use_localtime;
  46         char *snapdir;
  47         char *delimiter;
  48         bool snapdirseverywhere;
  49         bool crossmountpoints;
  50         bool fixinodes;
  51         char *sort_order;
  52         bool snapdir_absolute;
  53         char *mount_point;
  54         char *rel_connectpath; /* share root, relative to a snapshot root */
  55         char *snapshot_basepath; /* the absolute version of snapdir */
  56 };
  57
  58 /* Data-structure to hold the list of snap entries */
  59 struct shadow_copy2_snapentry {
  60         char *snapname;
  61         char *time_fmt;
  62         struct shadow_copy2_snapentry *next;
  63         struct shadow_copy2_snapentry *prev;
  64 };
  65
  66 struct shadow_copy2_snaplist_info {
  67         struct shadow_copy2_snapentry *snaplist; /* snapshot list */
  68         regex_t *regex; /* Regex to filter snaps */
  69         time_t fetch_time; /* snaplist update time */
  70 };
  71
  72
  73 /*
  74  * shadow_copy2 private structure. This structure will be
  75  * used to keep module specific information
  76  */
  77 struct shadow_copy2_private {
  78         struct shadow_copy2_config *config;
  79         struct shadow_copy2_snaplist_info *snaps;
  80         char *shadow_cwd; /* Absolute $cwd path. */
  81         /* Absolute connectpath - can vary depending on $cwd. */
  82         char *shadow_connectpath;
  83         /* talloc'ed realpath return. */
  84         struct smb_filename *shadow_realpath;
  85 };
  86
  87 static int shadow_copy2_get_shadow_copy_data(
  88         vfs_handle_struct *handle, files_struct *fsp,
  89         struct shadow_copy_data *shadow_copy2_data,
  90         bool labels);
  91
  92 /**
  93  *This function will create a new snapshot list entry and
  94  * return to the caller. This entry will also be added to
  95  * the global snapshot list.
  96  *
  97  * @param[in]   priv    shadow_copy2 specific data structure
  98  * @return      Newly   created snapshot entry or NULL on failure
  99  */
 100 static struct shadow_copy2_snapentry *shadow_copy2_create_snapentry(
 101                                         struct shadow_copy2_private *priv)
 102 {
 103         struct shadow_copy2_snapentry *tmpentry = NULL;
 104
 105         tmpentry = talloc_zero(priv->snaps, struct shadow_copy2_snapentry);
 106         if (tmpentry == NULL) {
 107                 DBG_ERR("talloc_zero() failed\n");
 108                 errno = ENOMEM;
 109                 return NULL;
 110         }
 111
 112         DLIST_ADD(priv->snaps->snaplist, tmpentry);
 113
 114         return tmpentry;
 115 }
 116
 117 /**
 118  *This function will delete the entire snaplist and reset
 119  * priv->snaps->snaplist to NULL.
 120  *
 121  * @param[in] priv shadow_copye specific data structure
 122  */
 123 static void shadow_copy2_delete_snaplist(struct shadow_copy2_private *priv)
 124 {
 125         struct shadow_copy2_snapentry *tmp = NULL;
 126
 127         while ((tmp = priv->snaps->snaplist) != NULL) {
 128                 DLIST_REMOVE(priv->snaps->snaplist, tmp);
 129                 talloc_free(tmp);
 130         }
 131 }
 132
 133 /**
 134  * Given a timestamp this function searches the global snapshot list
 135  * and returns the complete snapshot directory name saved in the entry.
 136  *
 137  * @param[in]   priv            shadow_copy2 specific structure
 138  * @param[in]   timestamp       timestamp corresponding to one of the snapshot
 139  * @param[out]  snap_str        buffer to copy the actual snapshot name
 140  * @param[in]   len             length of snap_str buffer
 141  *
 142  * @return      Length of actual snapshot name, and -1 on failure
 143  */
 144 static ssize_t shadow_copy2_saved_snapname(struct shadow_copy2_private *priv,
 145                                           struct tm *timestamp,
 146                                           char *snap_str, size_t len)
 147 {
 148         ssize_t snaptime_len = -1;
 149         struct shadow_copy2_snapentry *entry = NULL;
 150
 151         snaptime_len = strftime(snap_str, len, GMT_FORMAT, timestamp);
 152         if (snaptime_len == 0) {
 153                 DBG_ERR("strftime failed\n");
 154                 return -1;
 155         }
 156
 157         snaptime_len = -1;
 158
 159         for (entry = priv->snaps->snaplist; entry; entry = entry->next) {
 160                 if (strcmp(entry->time_fmt, snap_str) == 0) {
 161                         snaptime_len = snprintf(snap_str, len, "%s",
 162                                                 entry->snapname);
 163                         return snaptime_len;
 164                 }
 165         }
 166
 167         snap_str[0] = 0;
 168         return snaptime_len;
 169 }
 170
 171
 172 /**
 173  * This function will check if snaplist is updated or not. If snaplist
 174  * is empty then it will create a new list. Each time snaplist is updated
 175  * the time is recorded. If the snapshot time is greater than the snaplist
 176  * update time then chances are we are working on an older list. Then discard
 177  * the old list and fetch a new snaplist.
 178  *
 179  * @param[in]   handle          VFS handle struct
 180  * @param[in]   snap_time       time of snapshot
 181  *
 182  * @return      true if the list is updated else false
 183  */
 184 static bool shadow_copy2_update_snaplist(struct vfs_handle_struct *handle,
 185                 time_t snap_time)
 186 {
 187         int ret = -1;
 188         bool snaplist_updated = false;
 189         struct files_struct fsp = {0};
 190         struct smb_filename smb_fname = {0};
 191         double seconds = 0.0;
 192         struct shadow_copy2_private *priv = NULL;
 193
 194         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
 195                                 return false);
 196
 197         seconds = difftime(snap_time, priv->snaps->fetch_time);
 198
 199         /*
 200          * Fetch the snapshot list if either the snaplist is empty or the
 201          * required snapshot time is greater than the last fetched snaplist
 202          * time.
 203          */
 204         if (seconds > 0 || (priv->snaps->snaplist == NULL)) {
 205                 smb_fname.base_name = discard_const_p(char, ".");
 206                 fsp.fsp_name = &smb_fname;
 207
 208                 ret = shadow_copy2_get_shadow_copy_data(handle, &fsp,
 209                                                         NULL, false);
 210                 if (ret == 0) {
 211                         snaplist_updated = true;
 212                 } else {
 213                         DBG_ERR("Failed to get shadow copy data\n");
 214                 }
 215
 216         }
 217
 218         return snaplist_updated;
 219 }
 220
 221 static bool shadow_copy2_find_slashes(TALLOC_CTX *mem_ctx, const char *str,
 222                                       size_t **poffsets,
 223                                       unsigned *pnum_offsets)
 224 {
 225         unsigned num_offsets;
 226         size_t *offsets;
 227         const char *p;
 228
 229         num_offsets = 0;
 230
 231         p = str;
 232         while ((p = strchr(p, '/')) != NULL) {
 233                 num_offsets += 1;
 234                 p += 1;
 235         }
 236
 237         offsets = talloc_array(mem_ctx, size_t, num_offsets);
 238         if (offsets == NULL) {
 239                 return false;
 240         }
 241
 242         p = str;
 243         num_offsets = 0;
 244         while ((p = strchr(p, '/')) != NULL) {
 245                 offsets[num_offsets] = p-str;
 246                 num_offsets += 1;
 247                 p += 1;
 248         }
 249
 250         *poffsets = offsets;
 251         *pnum_offsets = num_offsets;
 252         return true;
 253 }
 254
 255 /**
 256  * Given a timestamp, build the posix level GMT-tag string
 257  * based on the configurable format.
 258  */
 259 static ssize_t shadow_copy2_posix_gmt_string(struct vfs_handle_struct *handle,
 260                                             time_t snapshot,
 261                                             char *snaptime_string,
 262                                             size_t len)
 263 {
 264         struct tm snap_tm;
 265         ssize_t snaptime_len;
 266         struct shadow_copy2_config *config;
 267         struct shadow_copy2_private *priv;
 268
 269         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
 270                                 return 0);
 271
 272         config = priv->config;
 273
 274         if (config->use_sscanf) {
 275                 snaptime_len = snprintf(snaptime_string,
 276                                         len,
 277                                         config->gmt_format,
 278                                         (unsigned long)snapshot);
 279                 if (snaptime_len <= 0) {
 280                         DEBUG(10, ("snprintf failed\n"));
 281                         return -1;
 282                 }
 283         } else {
 284                 if (config->use_localtime) {
 285                         if (localtime_r(&snapshot, &snap_tm) == 0) {
 286                                 DEBUG(10, ("gmtime_r failed\n"));
 287                                 return -1;
 288                         }
 289                 } else {
 290                         if (gmtime_r(&snapshot, &snap_tm) == 0) {
 291                                 DEBUG(10, ("gmtime_r failed\n"));
 292                                 return -1;
 293                         }
 294                 }
 295
 296                 if (priv->snaps->regex != NULL) {
 297                         snaptime_len = shadow_copy2_saved_snapname(priv,
 298                                                 &snap_tm, snaptime_string, len);
 299                         if (snaptime_len >= 0)
 300                                 return snaptime_len;
 301
 302                         /*
 303                          * If we fail to find the snapshot name, chances are
 304                          * that we have not updated our snaplist. Make sure the
 305                          * snaplist is updated.
 306                          */
 307                         if (!shadow_copy2_update_snaplist(handle, snapshot)) {
 308                                 DBG_DEBUG("shadow_copy2_update_snaplist "
 309                                           "failed\n");
 310                                 return -1;
 311                         }
 312
 313                         return shadow_copy2_saved_snapname(priv,
 314                                                 &snap_tm, snaptime_string, len);
 315                 }
 316
 317                 snaptime_len = strftime(snaptime_string,
 318                                         len,
 319                                         config->gmt_format,
 320                                         &snap_tm);
 321                 if (snaptime_len == 0) {
 322                         DEBUG(10, ("strftime failed\n"));
 323                         return -1;
 324                 }
 325         }
 326
 327         return snaptime_len;
 328 }
 329
 330 /**
 331  * Given a timestamp, build the string to insert into a path
 332  * as a path component for creating the local path to the
 333  * snapshot at the given timestamp of the input path.
 334  *
 335  * In the case of a parallel snapdir (specified with an
 336  * absolute path), this is the initial portion of the
 337  * local path of any snapshot file. The complete path is
 338  * obtained by appending the portion of the file's path
 339  * below the share root's mountpoint.
 340  */
 341 static char *shadow_copy2_insert_string(TALLOC_CTX *mem_ctx,
 342                                         struct vfs_handle_struct *handle,
 343                                         time_t snapshot)
 344 {
 345         fstring snaptime_string;
 346         ssize_t snaptime_len = 0;
 347         char *result = NULL;
 348         struct shadow_copy2_config *config;
 349         struct shadow_copy2_private *priv;
 350
 351         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
 352                                 return NULL);
 353
 354         config = priv->config;
 355
 356         snaptime_len = shadow_copy2_posix_gmt_string(handle,
 357                                                      snapshot,
 358                                                      snaptime_string,
 359                                                      sizeof(snaptime_string));
 360         if (snaptime_len <= 0) {
 361                 return NULL;
 362         }
 363
 364         if (config->snapdir_absolute) {
 365                 result = talloc_asprintf(mem_ctx, "%s/%s",
 366                                          config->snapdir, snaptime_string);
 367         } else {
 368                 result = talloc_asprintf(mem_ctx, "/%s/%s",
 369                                          config->snapdir, snaptime_string);
 370         }
 371         if (result == NULL) {
 372                 DEBUG(1, (__location__ " talloc_asprintf failed\n"));
 373         }
 374
 375         return result;
 376 }
 377
 378 /**
 379  * Build the posix snapshot path for the connection
 380  * at the given timestamp, i.e. the absolute posix path
 381  * that contains the snapshot for this file system.
 382  *
 383  * This only applies to classical case, i.e. not
 384  * to the "snapdirseverywhere" mode.
 385  */
 386 static char *shadow_copy2_snapshot_path(TALLOC_CTX *mem_ctx,
 387                                         struct vfs_handle_struct *handle,
 388                                         time_t snapshot)
 389 {
 390         fstring snaptime_string;
 391         ssize_t snaptime_len = 0;
 392         char *result = NULL;
 393         struct shadow_copy2_private *priv;
 394
 395         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
 396                                 return NULL);
 397
 398         snaptime_len = shadow_copy2_posix_gmt_string(handle,
 399                                                      snapshot,
 400                                                      snaptime_string,
 401                                                      sizeof(snaptime_string));
 402         if (snaptime_len <= 0) {
 403                 return NULL;
 404         }
 405
 406         result = talloc_asprintf(mem_ctx, "%s/%s",
 407                                  priv->config->snapshot_basepath, snaptime_string);
 408         if (result == NULL) {
 409                 DEBUG(1, (__location__ " talloc_asprintf failed\n"));
 410         }
 411
 412         return result;
 413 }
 414
 415 static char *make_path_absolute(TALLOC_CTX *mem_ctx,
 416                                 struct shadow_copy2_private *priv,
 417                                 const char *name)
 418 {
 419         char *newpath = NULL;
 420         char *abs_path = NULL;
 421
 422         if (name[0] != '/') {
 423                 newpath = talloc_asprintf(mem_ctx,
 424                                         "%s/%s",
 425                                         priv->shadow_cwd,
 426                                         name);
 427                 if (newpath == NULL) {
 428                         return NULL;
 429                 }
 430                 name = newpath;
 431         }
 432         abs_path = canonicalize_absolute_path(mem_ctx, name);
 433         TALLOC_FREE(newpath);
 434         return abs_path;
 435 }
 436
 437 /* Return a $cwd-relative path. */
 438 static bool make_relative_path(const char *cwd, char *abs_path)
 439 {
 440         size_t cwd_len = strlen(cwd);
 441         size_t abs_len = strlen(abs_path);
 442
 443         if (abs_len < cwd_len) {
 444                 return false;
 445         }
 446         if (memcmp(abs_path, cwd, cwd_len) != 0) {
 447                 return false;
 448         }
 449         /* The cwd_len != 1 case is for $cwd == '/' */
 450         if (cwd_len != 1 &&
 451             abs_path[cwd_len] != '/' &&
 452             abs_path[cwd_len] != '\0')
 453         {
 454                 return false;
 455         }
 456         if (abs_path[cwd_len] == '/') {
 457                 cwd_len++;
 458         }
 459         memmove(abs_path, &abs_path[cwd_len], abs_len + 1 - cwd_len);
 460         return true;
 461 }
 462
 463 static bool shadow_copy2_snapshot_to_gmt(vfs_handle_struct *handle,
 464                                         const char *name,
 465                                         char *gmt, size_t gmt_len);
 466
 467 /*
 468  * Check if an incoming filename is already a snapshot converted pathname.
 469  *
 470  * If so, it returns the pathname truncated at the snapshot point which
 471  * will be used as the connectpath.
 472  */
 473
 474 static int check_for_converted_path(TALLOC_CTX *mem_ctx,
 475                                 struct vfs_handle_struct *handle,
 476                                 struct shadow_copy2_private *priv,
 477                                 char *abs_path,
 478                                 bool *ppath_already_converted,
 479                                 char **pconnectpath)
 480 {
 481         size_t snapdirlen = 0;
 482         char *p = strstr_m(abs_path, priv->config->snapdir);
 483         char *q = NULL;
 484         char *connect_path = NULL;
 485         char snapshot[GMT_NAME_LEN+1];
 486
 487         *ppath_already_converted = false;
 488
 489         if (p == NULL) {
 490                 /* Must at least contain shadow:snapdir. */
 491                 return 0;
 492         }
 493
 494         if (priv->config->snapdir[0] == '/' &&
 495                         p != abs_path) {
 496                 /* Absolute shadow:snapdir must be at the start. */
 497                 return 0;
 498         }
 499
 500         snapdirlen = strlen(priv->config->snapdir);
 501         if (p[snapdirlen] != '/') {
 502                 /* shadow:snapdir must end as a separate component. */
 503                 return 0;
 504         }
 505
 506         if (p > abs_path && p[-1] != '/') {
 507                 /* shadow:snapdir must start as a separate component. */
 508                 return 0;
 509         }
 510
 511         p += snapdirlen;
 512         p++; /* Move past the / */
 513
 514         /*
 515          * Need to return up to the next path
 516          * component after the time.
 517          * This will be used as the connectpath.
 518          */
 519         q = strchr(p, '/');
 520         if (q == NULL) {
 521                 /*
 522                  * No next path component.
 523                  * Use entire string.
 524                  */
 525                 connect_path = talloc_strdup(mem_ctx,
 526                                         abs_path);
 527         } else {
 528                 connect_path = talloc_strndup(mem_ctx,
 529                                         abs_path,
 530                                         q - abs_path);
 531         }
 532         if (connect_path == NULL) {
 533                 return ENOMEM;
 534         }
 535
 536         /*
 537          * Point p at the same offset in connect_path as
 538          * it is in abs_path.
 539          */
 540
 541         p = &connect_path[p - abs_path];
 542
 543         /*
 544          * Now ensure there is a time string at p.
 545          * The SMB-format @GMT-token string is returned
 546          * in snapshot.
 547          */
 548
 549         if (!shadow_copy2_snapshot_to_gmt(handle,
 550                                 p,
 551                                 snapshot,
 552                                 sizeof(snapshot))) {
 553                 TALLOC_FREE(connect_path);
 554                 return 0;
 555         }
 556
 557         if (pconnectpath != NULL) {
 558                 *pconnectpath = connect_path;
 559         }
 560
 561         *ppath_already_converted = true;
 562
 563         DBG_DEBUG("path |%s| is already converted. "
 564                 "connect path = |%s|\n",
 565                 abs_path,
 566                 connect_path);
 567
 568         return 0;
 569 }
 570
 571 /**
 572  * This function does two things.
 573  *
 574  * 1). Checks if an incoming filename is already a
 575  * snapshot converted pathname.
 576  *     If so, it returns the pathname truncated
 577  *     at the snapshot point which will be used
 578  *     as the connectpath, and then does an early return.
 579  *
 580  * 2). Checks if an incoming filename contains an
 581  * SMB-layer @GMT- style timestamp.
 582  *     If so, it strips the timestamp, and returns
 583  *     both the timestamp and the stripped path
 584  *     (making it cwd-relative).
 585  */
 586
 587 static bool _shadow_copy2_strip_snapshot_internal(TALLOC_CTX *mem_ctx,
 588                                         struct vfs_handle_struct *handle,
 589                                         const struct smb_filename *smb_fname,
 590                                         time_t *ptimestamp,
 591                                         char **pstripped,
 592                                         char **psnappath,
 593                                         bool *_already_converted,
 594                                         const char *function)
 595 {
 596         char *stripped = NULL;
 597         struct shadow_copy2_private *priv;
 598         char *abs_path = NULL;
 599         bool ret = true;
 600         bool already_converted = false;
 601         int err = 0;
 602
 603         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
 604                                 return false);
 605
 606         DBG_DEBUG("[from %s()] Path '%s'\n",
 607                   function, smb_fname_str_dbg(smb_fname));
 608
 609         if (_already_converted != NULL) {
 610                 *_already_converted = false;
 611         }
 612
 613         abs_path = make_path_absolute(mem_ctx, priv, smb_fname->base_name);
 614         if (abs_path == NULL) {
 615                 ret = false;
 616                 goto out;
 617         }
 618
 619         DBG_DEBUG("abs path '%s'\n", abs_path);
 620
 621         err = check_for_converted_path(mem_ctx,
 622                                         handle,
 623                                         priv,
 624                                         abs_path,
 625                                         &already_converted,
 626                                         psnappath);
 627         if (err != 0) {
 628                 /* error in conversion. */
 629                 ret = false;
 630                 goto out;
 631         }
 632
 633         if (already_converted) {
 634                 if (_already_converted != NULL) {
 635                         *_already_converted = true;
 636                 }
 637                 goto out;
 638         }
 639
 640         if (smb_fname->twrp == 0) {
 641                 goto out;
 642         }
 643
 644         if (ptimestamp != NULL) {
 645                 *ptimestamp = nt_time_to_unix(smb_fname->twrp);
 646         }
 647
 648         if (pstripped != NULL) {
 649                 stripped = talloc_strdup(mem_ctx, abs_path);
 650                 if (stripped == NULL) {
 651                         ret = false;
 652                         goto out;
 653                 }
 654
 655                 if (smb_fname->base_name[0] != '/') {
 656                         ret = make_relative_path(priv->shadow_cwd, stripped);
 657                         if (!ret) {
 658                                 DBG_DEBUG("Path '%s' "
 659                                         "doesn't start with cwd '%s'\n",
 660                                         stripped, priv->shadow_cwd);
 661                                 ret = false;
 662                                 errno = ENOENT;
 663                                 goto out;
 664                         }
 665                 }
 666                 *pstripped = stripped;
 667         }
 668
 669         ret = true;
 670
 671   out:
 672         TALLOC_FREE(abs_path);
 673         return ret;
 674 }
 675
 676 #define shadow_copy2_strip_snapshot_internal(mem_ctx, handle, orig_name, \
 677                 ptimestamp, pstripped, psnappath, _already_converted) \
 678         _shadow_copy2_strip_snapshot_internal((mem_ctx), (handle), (orig_name), \
 679                 (ptimestamp), (pstripped), (psnappath), (_already_converted), \
 680                                               __FUNCTION__)
 681
 682 static bool _shadow_copy2_strip_snapshot(TALLOC_CTX *mem_ctx,
 683                                          struct vfs_handle_struct *handle,
 684                                          const struct smb_filename *orig_name,
 685                                          time_t *ptimestamp,
 686                                          char **pstripped,
 687                                          const char *function)
 688 {
 689         return _shadow_copy2_strip_snapshot_internal(mem_ctx,
 690                                         handle,
 691                                         orig_name,
 692                                         ptimestamp,
 693                                         pstripped,
 694                                         NULL,
 695                                         NULL,
 696                                         function);
 697 }
 698
 699 #define shadow_copy2_strip_snapshot(mem_ctx, handle, orig_name, \
 700                 ptimestamp, pstripped) \
 701         _shadow_copy2_strip_snapshot((mem_ctx), (handle), (orig_name), \
 702                 (ptimestamp), (pstripped), __FUNCTION__)
 703
 704 static bool _shadow_copy2_strip_snapshot_converted(TALLOC_CTX *mem_ctx,
 705                                         struct vfs_handle_struct *handle,
 706                                         const struct smb_filename *orig_name,
 707                                         time_t *ptimestamp,
 708                                         char **pstripped,
 709                                         bool *is_converted,
 710                                         const char *function)
 711 {
 712         return _shadow_copy2_strip_snapshot_internal(mem_ctx,
 713                                         handle,
 714                                         orig_name,
 715                                         ptimestamp,
 716                                         pstripped,
 717                                         NULL,
 718                                         is_converted,
 719                                         function);
 720 }
 721
 722 #define shadow_copy2_strip_snapshot_converted(mem_ctx, handle, orig_name, \
 723                 ptimestamp, pstripped, is_converted) \
 724         _shadow_copy2_strip_snapshot_converted((mem_ctx), (handle), (orig_name), \
 725                 (ptimestamp), (pstripped), (is_converted), __FUNCTION__)
 726
 727 static char *shadow_copy2_find_mount_point(TALLOC_CTX *mem_ctx,
 728                                            vfs_handle_struct *handle)
 729 {
 730         char *path = talloc_strdup(mem_ctx, handle->conn->connectpath);
 731         dev_t dev;
 732         struct stat st;
 733         char *p;
 734
 735         if (stat(path, &st) != 0) {
 736                 talloc_free(path);
 737                 return NULL;
 738         }
 739
 740         dev = st.st_dev;
 741
 742         while ((p = strrchr(path, '/')) && p > path) {
 743                 *p = 0;
 744                 if (stat(path, &st) != 0) {
 745                         talloc_free(path);
 746                         return NULL;
 747                 }
 748                 if (st.st_dev != dev) {
 749                         *p = '/';
 750                         break;
 751                 }
 752         }
 753
 754         return path;
 755 }
 756
 757 /**
 758  * Convert from a name as handed in via the SMB layer
 759  * and a timestamp into the local path of the snapshot
 760  * of the provided file at the provided time.
 761  * Also return the path in the snapshot corresponding
 762  * to the file's share root.
 763  */
 764 static char *shadow_copy2_do_convert(TALLOC_CTX *mem_ctx,
 765                                      struct vfs_handle_struct *handle,
 766                                      const char *name, time_t timestamp,
 767                                      size_t *snaproot_len)
 768 {
 769         struct smb_filename converted_fname;
 770         char *result = NULL;
 771         size_t *slashes = NULL;
 772         unsigned num_slashes;
 773         char *path = NULL;
 774         size_t pathlen;
 775         char *insert = NULL;
 776         char *converted = NULL;
 777         size_t insertlen, connectlen = 0;
 778         int saved_errno = 0;
 779         int i;
 780         size_t min_offset;
 781         struct shadow_copy2_config *config;
 782         struct shadow_copy2_private *priv;
 783         size_t in_share_offset = 0;
 784
 785         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
 786                                 return NULL);
 787
 788         config = priv->config;
 789
 790         DEBUG(10, ("converting '%s'\n", name));
 791
 792         if (!config->snapdirseverywhere) {
 793                 int ret;
 794                 char *snapshot_path;
 795
 796                 snapshot_path = shadow_copy2_snapshot_path(talloc_tos(),
 797                                                            handle,
 798                                                            timestamp);
 799                 if (snapshot_path == NULL) {
 800                         goto fail;
 801                 }
 802
 803                 if (config->rel_connectpath == NULL) {
 804                         converted = talloc_asprintf(mem_ctx, "%s/%s",
 805                                                     snapshot_path, name);
 806                 } else {
 807                         converted = talloc_asprintf(mem_ctx, "%s/%s/%s",
 808                                                     snapshot_path,
 809                                                     config->rel_connectpath,
 810                                                     name);
 811                 }
 812                 if (converted == NULL) {
 813                         goto fail;
 814                 }
 815
 816                 ZERO_STRUCT(converted_fname);
 817                 converted_fname.base_name = converted;
 818
 819                 ret = SMB_VFS_NEXT_LSTAT(handle, &converted_fname);
 820                 DEBUG(10, ("Trying[not snapdirseverywhere] %s: %d (%s)\n",
 821                            converted,
 822                            ret, ret == 0 ? "ok" : strerror(errno)));
 823                 if (ret == 0) {
 824                         DEBUG(10, ("Found %s\n", converted));
 825                         result = converted;
 826                         converted = NULL;
 827                         if (snaproot_len != NULL) {
 828                                 *snaproot_len = strlen(snapshot_path);
 829                                 if (config->rel_connectpath != NULL) {
 830                                         *snaproot_len +=
 831                                             strlen(config->rel_connectpath) + 1;
 832                                 }
 833                         }
 834                         goto fail;
 835                 } else {
 836                         errno = ENOENT;
 837                         goto fail;
 838                 }
 839                 /* never reached ... */
 840         }
 841
 842         connectlen = strlen(handle->conn->connectpath);
 843         if (name[0] == 0) {
 844                 path = talloc_strdup(mem_ctx, handle->conn->connectpath);
 845         } else {
 846                 path = talloc_asprintf(
 847                         mem_ctx, "%s/%s", handle->conn->connectpath, name);
 848         }
 849         if (path == NULL) {
 850                 errno = ENOMEM;
 851                 goto fail;
 852         }
 853         pathlen = talloc_get_size(path)-1;
 854
 855         if (!shadow_copy2_find_slashes(talloc_tos(), path,
 856                                        &slashes, &num_slashes)) {
 857                 goto fail;
 858         }
 859
 860         insert = shadow_copy2_insert_string(talloc_tos(), handle, timestamp);
 861         if (insert == NULL) {
 862                 goto fail;
 863         }
 864         insertlen = talloc_get_size(insert)-1;
 865
 866         /*
 867          * Note: We deliberatly don't expensively initialize the
 868          * array with talloc_zero here: Putting zero into
 869          * converted[pathlen+insertlen] below is sufficient, because
 870          * in the following for loop, the insert string is inserted
 871          * at various slash places. So the memory up to position
 872          * pathlen+insertlen will always be initialized when the
 873          * converted string is used.
 874          */
 875         converted = talloc_array(mem_ctx, char, pathlen + insertlen + 1);
 876         if (converted == NULL) {
 877                 goto fail;
 878         }
 879
 880         if (path[pathlen-1] != '/') {
 881                 /*
 882                  * Append a fake slash to find the snapshot root
 883                  */
 884                 size_t *tmp;
 885                 tmp = talloc_realloc(talloc_tos(), slashes,
 886                                      size_t, num_slashes+1);
 887                 if (tmp == NULL) {
 888                         goto fail;
 889                 }
 890                 slashes = tmp;
 891                 slashes[num_slashes] = pathlen;
 892                 num_slashes += 1;
 893         }
 894
 895         min_offset = 0;
 896
 897         if (!config->crossmountpoints) {
 898                 min_offset = strlen(config->mount_point);
 899         }
 900
 901         memcpy(converted, path, pathlen+1);
 902         converted[pathlen+insertlen] = '\0';
 903
 904         ZERO_STRUCT(converted_fname);
 905         converted_fname.base_name = converted;
 906
 907         for (i = num_slashes-1; i>=0; i--) {
 908                 int ret;
 909                 size_t offset;
 910
 911                 offset = slashes[i];
 912
 913                 if (offset < min_offset) {
 914                         errno = ENOENT;
 915                         goto fail;
 916                 }
 917
 918                 if (offset >= connectlen) {
 919                         in_share_offset = offset;
 920                 }
 921
 922                 memcpy(converted+offset, insert, insertlen);
 923
 924                 offset += insertlen;
 925                 memcpy(converted+offset, path + slashes[i],
 926                        pathlen - slashes[i]);
 927
 928                 ret = SMB_VFS_NEXT_LSTAT(handle, &converted_fname);
 929
 930                 DEBUG(10, ("Trying[snapdirseverywhere] %s: %d (%s)\n",
 931                            converted,
 932                            ret, ret == 0 ? "ok" : strerror(errno)));
 933                 if (ret == 0) {
 934                         /* success */
 935                         if (snaproot_len != NULL) {
 936                                 *snaproot_len = in_share_offset + insertlen;
 937                         }
 938                         break;
 939                 }
 940                 if (errno == ENOTDIR) {
 941                         /*
 942                          * This is a valid condition: We appended the
 943                          * .snapshots/@GMT.. to a file name. Just try
 944                          * with the upper levels.
 945                          */
 946                         continue;
 947                 }
 948                 if (errno != ENOENT) {
 949                         /* Other problem than "not found" */
 950                         goto fail;
 951                 }
 952         }
 953
 954         if (i >= 0) {
 955                 /*
 956                  * Found something
 957                  */
 958                 DEBUG(10, ("Found %s\n", converted));
 959                 result = converted;
 960                 converted = NULL;
 961         } else {
 962                 errno = ENOENT;
 963         }
 964 fail:
 965         if (result == NULL) {
 966                 saved_errno = errno;
 967         }
 968         TALLOC_FREE(converted);
 969         TALLOC_FREE(insert);
 970         TALLOC_FREE(slashes);
 971         TALLOC_FREE(path);
 972         if (saved_errno != 0) {
 973                 errno = saved_errno;
 974         }
 975         return result;
 976 }
 977
 978 /**
 979  * Convert from a name as handed in via the SMB layer
 980  * and a timestamp into the local path of the snapshot
 981  * of the provided file at the provided time.
 982  */
 983 static char *shadow_copy2_convert(TALLOC_CTX *mem_ctx,
 984                                   struct vfs_handle_struct *handle,
 985                                   const char *name, time_t timestamp)
 986 {
 987         return shadow_copy2_do_convert(mem_ctx, handle, name, timestamp, NULL);
 988 }
 989
 990 /*
 991   modify a sbuf return to ensure that inodes in the shadow directory
 992   are different from those in the main directory
 993  */
 994 static void convert_sbuf(vfs_handle_struct *handle, const char *fname,
 995                          SMB_STRUCT_STAT *sbuf)
 996 {
 997         struct shadow_copy2_private *priv;
 998
 999         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1000                                 return);
1001
1002         if (priv->config->fixinodes) {
1003                 /* some snapshot systems, like GPFS, return the same
1004                    device:inode for the snapshot files as the current
1005                    files. That breaks the 'restore' button in the shadow copy
1006                    GUI, as the client gets a sharing violation.
1007
1008                    This is a crude way of allowing both files to be
1009                    open at once. It has a slight chance of inode
1010                    number collision, but I can't see a better approach
1011                    without significant VFS changes
1012                 */
1013                 TDB_DATA key = { .dptr = discard_const_p(uint8_t, fname),
1014                                  .dsize = strlen(fname) };
1015                 uint32_t shash;
1016
1017                 shash = tdb_jenkins_hash(&key) & 0xFF000000;
1018                 if (shash == 0) {
1019                         shash = 1;
1020                 }
1021                 sbuf->st_ex_ino ^= shash;
1022         }
1023 }
1024
1025 static int shadow_copy2_renameat(vfs_handle_struct *handle,
1026                                 files_struct *srcfsp,
1027                                 const struct smb_filename *smb_fname_src,
1028                                 files_struct *dstfsp,
1029                                 const struct smb_filename *smb_fname_dst)
1030 {
1031         time_t timestamp_src = 0;
1032         time_t timestamp_dst = 0;
1033         char *snappath_src = NULL;
1034         char *snappath_dst = NULL;
1035
1036         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(), handle,
1037                                          smb_fname_src,
1038                                          &timestamp_src, NULL, &snappath_src,
1039                                          NULL)) {
1040                 return -1;
1041         }
1042         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(), handle,
1043                                          smb_fname_dst,
1044                                          &timestamp_dst, NULL, &snappath_dst,
1045                                          NULL)) {
1046                 return -1;
1047         }
1048         if (timestamp_src != 0) {
1049                 errno = EXDEV;
1050                 return -1;
1051         }
1052         if (timestamp_dst != 0) {
1053                 errno = EROFS;
1054                 return -1;
1055         }
1056         /*
1057          * Don't allow rename on already converted paths.
1058          */
1059         if (snappath_src != NULL) {
1060                 errno = EXDEV;
1061                 return -1;
1062         }
1063         if (snappath_dst != NULL) {
1064                 errno = EROFS;
1065                 return -1;
1066         }
1067         return SMB_VFS_NEXT_RENAMEAT(handle,
1068                         srcfsp,
1069                         smb_fname_src,
1070                         dstfsp,
1071                         smb_fname_dst);
1072 }
1073
1074 static int shadow_copy2_symlinkat(vfs_handle_struct *handle,
1075                         const struct smb_filename *link_contents,
1076                         struct files_struct *dirfsp,
1077                         const struct smb_filename *new_smb_fname)
1078 {
1079         time_t timestamp_old = 0;
1080         time_t timestamp_new = 0;
1081         char *snappath_old = NULL;
1082         char *snappath_new = NULL;
1083
1084         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
1085                                 handle,
1086                                 link_contents,
1087                                 &timestamp_old,
1088                                 NULL,
1089                                 &snappath_old,
1090                                 NULL)) {
1091                 return -1;
1092         }
1093         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
1094                                 handle,
1095                                 new_smb_fname,
1096                                 &timestamp_new,
1097                                 NULL,
1098                                 &snappath_new,
1099                                 NULL)) {
1100                 return -1;
1101         }
1102         if ((timestamp_old != 0) || (timestamp_new != 0)) {
1103                 errno = EROFS;
1104                 return -1;
1105         }
1106         /*
1107          * Don't allow symlinks on already converted paths.
1108          */
1109         if ((snappath_old != NULL) || (snappath_new != NULL)) {
1110                 errno = EROFS;
1111                 return -1;
1112         }
1113         return SMB_VFS_NEXT_SYMLINKAT(handle,
1114                                 link_contents,
1115                                 dirfsp,
1116                                 new_smb_fname);
1117 }
1118
1119 static int shadow_copy2_linkat(vfs_handle_struct *handle,
1120                         files_struct *srcfsp,
1121                         const struct smb_filename *old_smb_fname,
1122                         files_struct *dstfsp,
1123                         const struct smb_filename *new_smb_fname,
1124                         int flags)
1125 {
1126         time_t timestamp_old = 0;
1127         time_t timestamp_new = 0;
1128         char *snappath_old = NULL;
1129         char *snappath_new = NULL;
1130
1131         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
1132                                 handle,
1133                                 old_smb_fname,
1134                                 &timestamp_old,
1135                                 NULL,
1136                                 &snappath_old,
1137                                 NULL)) {
1138                 return -1;
1139         }
1140         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
1141                                 handle,
1142                                 new_smb_fname,
1143                                 &timestamp_new,
1144                                 NULL,
1145                                 &snappath_new,
1146                                 NULL)) {
1147                 return -1;
1148         }
1149         if ((timestamp_old != 0) || (timestamp_new != 0)) {
1150                 errno = EROFS;
1151                 return -1;
1152         }
1153         /*
1154          * Don't allow links on already converted paths.
1155          */
1156         if ((snappath_old != NULL) || (snappath_new != NULL)) {
1157                 errno = EROFS;
1158                 return -1;
1159         }
1160         return SMB_VFS_NEXT_LINKAT(handle,
1161                         srcfsp,
1162                         old_smb_fname,
1163                         dstfsp,
1164                         new_smb_fname,
1165                         flags);
1166 }
1167
1168 static int shadow_copy2_stat(vfs_handle_struct *handle,
1169                              struct smb_filename *smb_fname)
1170 {
1171         struct shadow_copy2_private *priv = NULL;
1172         time_t timestamp = 0;
1173         char *stripped = NULL;
1174         bool converted = false;
1175         char *abspath = NULL;
1176         char *tmp;
1177         int ret = 0;
1178
1179         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1180                                 return -1);
1181
1182         if (!shadow_copy2_strip_snapshot_converted(talloc_tos(),
1183                                                    handle,
1184                                                    smb_fname,
1185                                                    &timestamp,
1186                                                    &stripped,
1187                                                    &converted)) {
1188                 return -1;
1189         }
1190         if (timestamp == 0) {
1191                 TALLOC_FREE(stripped);
1192                 ret = SMB_VFS_NEXT_STAT(handle, smb_fname);
1193                 if (ret != 0) {
1194                         return ret;
1195                 }
1196                 if (!converted) {
1197                         return 0;
1198                 }
1199
1200                 abspath = make_path_absolute(talloc_tos(),
1201                                              priv,
1202                                              smb_fname->base_name);
1203                 if (abspath == NULL) {
1204                         return -1;
1205                 }
1206
1207                 convert_sbuf(handle, abspath, &smb_fname->st);
1208                 TALLOC_FREE(abspath);
1209                 return 0;
1210         }
1211
1212         tmp = smb_fname->base_name;
1213         smb_fname->base_name = shadow_copy2_convert(
1214                 talloc_tos(), handle, stripped, timestamp);
1215         TALLOC_FREE(stripped);
1216
1217         if (smb_fname->base_name == NULL) {
1218                 smb_fname->base_name = tmp;
1219                 return -1;
1220         }
1221
1222         ret = SMB_VFS_NEXT_STAT(handle, smb_fname);
1223         if (ret != 0) {
1224                 goto out;
1225         }
1226
1227         abspath = make_path_absolute(talloc_tos(),
1228                                      priv,
1229                                      smb_fname->base_name);
1230         if (abspath == NULL) {
1231                 ret = -1;
1232                 goto out;
1233         }
1234
1235         convert_sbuf(handle, abspath, &smb_fname->st);
1236         TALLOC_FREE(abspath);
1237
1238 out:
1239         TALLOC_FREE(smb_fname->base_name);
1240         smb_fname->base_name = tmp;
1241
1242         return ret;
1243 }
1244
1245 static int shadow_copy2_lstat(vfs_handle_struct *handle,
1246                               struct smb_filename *smb_fname)
1247 {
1248         struct shadow_copy2_private *priv = NULL;
1249         time_t timestamp = 0;
1250         char *stripped = NULL;
1251         bool converted = false;
1252         char *abspath = NULL;
1253         char *tmp;
1254         int ret = 0;
1255
1256         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1257                                 return -1);
1258
1259         if (!shadow_copy2_strip_snapshot_converted(talloc_tos(),
1260                                                    handle,
1261                                                    smb_fname,
1262                                                    &timestamp,
1263                                                    &stripped,
1264                                                    &converted)) {
1265                 return -1;
1266         }
1267         if (timestamp == 0) {
1268                 TALLOC_FREE(stripped);
1269                 ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
1270                 if (ret != 0) {
1271                         return ret;
1272                 }
1273                 if (!converted) {
1274                         return 0;
1275                 }
1276
1277                 abspath = make_path_absolute(talloc_tos(),
1278                                              priv,
1279                                              smb_fname->base_name);
1280                 if (abspath == NULL) {
1281                         return -1;
1282                 }
1283
1284                 convert_sbuf(handle, abspath, &smb_fname->st);
1285                 TALLOC_FREE(abspath);
1286                 return 0;
1287         }
1288
1289         tmp = smb_fname->base_name;
1290         smb_fname->base_name = shadow_copy2_convert(
1291                 talloc_tos(), handle, stripped, timestamp);
1292         TALLOC_FREE(stripped);
1293
1294         if (smb_fname->base_name == NULL) {
1295                 smb_fname->base_name = tmp;
1296                 return -1;
1297         }
1298
1299         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
1300         if (ret != 0) {
1301                 goto out;
1302         }
1303
1304         abspath = make_path_absolute(talloc_tos(),
1305                                      priv,
1306                                      smb_fname->base_name);
1307         if (abspath == NULL) {
1308                 ret = -1;
1309                 goto out;
1310         }
1311
1312         convert_sbuf(handle, abspath, &smb_fname->st);
1313         TALLOC_FREE(abspath);
1314
1315 out:
1316         TALLOC_FREE(smb_fname->base_name);
1317         smb_fname->base_name = tmp;
1318
1319         return ret;
1320 }
1321
1322 static int shadow_copy2_fstat(vfs_handle_struct *handle, files_struct *fsp,
1323                               SMB_STRUCT_STAT *sbuf)
1324 {
1325         struct shadow_copy2_private *priv = NULL;
1326         time_t timestamp = 0;
1327         struct smb_filename *orig_smb_fname = NULL;
1328         struct smb_filename vss_smb_fname;
1329         struct smb_filename *orig_base_smb_fname = NULL;
1330         struct smb_filename vss_base_smb_fname;
1331         char *stripped = NULL;
1332         char *abspath = NULL;
1333         bool converted = false;
1334         bool ok;
1335         int ret;
1336
1337         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1338                                 return -1);
1339
1340         ok = shadow_copy2_strip_snapshot_converted(talloc_tos(),
1341                                                    handle,
1342                                                    fsp->fsp_name,
1343                                                    &timestamp,
1344                                                    &stripped,
1345                                                    &converted);
1346         if (!ok) {
1347                 return -1;
1348         }
1349
1350         if (timestamp == 0) {
1351                 TALLOC_FREE(stripped);
1352                 ret = SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
1353                 if (ret != 0) {
1354                         return ret;
1355                 }
1356                 if (!converted) {
1357                         return 0;
1358                 }
1359
1360                 abspath = make_path_absolute(talloc_tos(),
1361                                              priv,
1362                                              fsp->fsp_name->base_name);
1363                 if (abspath == NULL) {
1364                         return -1;
1365                 }
1366
1367                 convert_sbuf(handle, abspath, sbuf);
1368                 TALLOC_FREE(abspath);
1369                 return 0;
1370         }
1371
1372         vss_smb_fname = *fsp->fsp_name;
1373         vss_smb_fname.base_name = shadow_copy2_convert(talloc_tos(),
1374                                                        handle,
1375                                                        stripped,
1376                                                        timestamp);
1377         TALLOC_FREE(stripped);
1378         if (vss_smb_fname.base_name == NULL) {
1379                 return -1;
1380         }
1381
1382         orig_smb_fname = fsp->fsp_name;
1383         fsp->fsp_name = &vss_smb_fname;
1384
1385         if (fsp_is_alternate_stream(fsp)) {
1386                 vss_base_smb_fname = *fsp->base_fsp->fsp_name;
1387                 vss_base_smb_fname.base_name = vss_smb_fname.base_name;
1388                 orig_base_smb_fname = fsp->base_fsp->fsp_name;
1389                 fsp->base_fsp->fsp_name = &vss_base_smb_fname;
1390         }
1391
1392         ret = SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
1393         if (ret != 0) {
1394                 goto out;
1395         }
1396
1397         abspath = make_path_absolute(talloc_tos(),
1398                                      priv,
1399                                      fsp->fsp_name->base_name);
1400         if (abspath == NULL) {
1401                 ret = -1;
1402                 goto out;
1403         }
1404
1405         convert_sbuf(handle, abspath, sbuf);
1406         TALLOC_FREE(abspath);
1407
1408 out:
1409         fsp->fsp_name = orig_smb_fname;
1410         if (fsp_is_alternate_stream(fsp)) {
1411                 fsp->base_fsp->fsp_name = orig_base_smb_fname;
1412         }
1413
1414         return ret;
1415 }
1416
1417 static int shadow_copy2_openat(vfs_handle_struct *handle,
1418                                const struct files_struct *dirfsp,
1419                                const struct smb_filename *smb_fname_in,
1420                                struct files_struct *fsp,
1421                                int flags,
1422                                mode_t mode)
1423 {
1424         struct smb_filename *smb_fname = NULL;
1425         time_t timestamp = 0;
1426         char *stripped = NULL;
1427         bool is_converted = false;
1428         int saved_errno = 0;
1429         int ret;
1430         bool ok;
1431
1432         smb_fname = full_path_from_dirfsp_atname(talloc_tos(),
1433                                                  dirfsp,
1434                                                  smb_fname_in);
1435         if (smb_fname == NULL) {
1436                 errno = ENOMEM;
1437                 return -1;
1438         }
1439
1440         ok = shadow_copy2_strip_snapshot_converted(talloc_tos(),
1441                                                    handle,
1442                                                    smb_fname,
1443                                                    &timestamp,
1444                                                    &stripped,
1445                                                    &is_converted);
1446         if (!ok) {
1447                 return -1;
1448         }
1449         if (timestamp == 0) {
1450                 if (is_converted) {
1451                         /*
1452                          * Just pave over the user requested mode and use
1453                          * O_RDONLY. Later attempts by the client to write on
1454                          * the handle will fail in the pwrite() syscall with
1455                          * EINVAL which we carefully map to EROFS. In sum, this
1456                          * matches Windows behaviour.
1457                          */
1458                         flags &= ~(O_WRONLY | O_RDWR | O_CREAT);
1459                 }
1460                 return SMB_VFS_NEXT_OPENAT(handle,
1461                                            dirfsp,
1462                                            smb_fname_in,
1463                                            fsp,
1464                                            flags,
1465                                            mode);
1466         }
1467
1468         smb_fname->base_name = shadow_copy2_convert(smb_fname,
1469                                                handle,
1470                                                stripped,
1471                                                timestamp);
1472         TALLOC_FREE(stripped);
1473         if (smb_fname->base_name == NULL) {
1474                 TALLOC_FREE(smb_fname);
1475                 errno = ENOMEM;
1476                 return -1;
1477         }
1478
1479         /*
1480          * Just pave over the user requested mode and use O_RDONLY. Later
1481          * attempts by the client to write on the handle will fail in the
1482          * pwrite() syscall with EINVAL which we carefully map to EROFS. In sum,
1483          * this matches Windows behaviour.
1484          */
1485         flags &= ~(O_WRONLY | O_RDWR | O_CREAT);
1486
1487         ret = SMB_VFS_NEXT_OPENAT(handle,
1488                                   dirfsp,
1489                                   smb_fname,
1490                                   fsp,
1491                                   flags,
1492                                   mode);
1493         if (ret == -1) {
1494                 saved_errno = errno;
1495         }
1496
1497         TALLOC_FREE(smb_fname);
1498
1499         if (saved_errno != 0) {
1500                 errno = saved_errno;
1501         }
1502         return ret;
1503 }
1504
1505 static int shadow_copy2_unlinkat(vfs_handle_struct *handle,
1506                         struct files_struct *dirfsp,
1507                         const struct smb_filename *smb_fname,
1508                         int flags)
1509 {
1510         time_t timestamp = 0;
1511
1512         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1513                                          smb_fname,
1514                                          &timestamp, NULL)) {
1515                 return -1;
1516         }
1517         if (timestamp != 0) {
1518                 errno = EROFS;
1519                 return -1;
1520         }
1521         return SMB_VFS_NEXT_UNLINKAT(handle,
1522                         dirfsp,
1523                         smb_fname,
1524                         flags);
1525 }
1526
1527 static int shadow_copy2_fchmod(vfs_handle_struct *handle,
1528                        struct files_struct *fsp,
1529                        mode_t mode)
1530 {
1531         time_t timestamp = 0;
1532         const struct smb_filename *smb_fname = NULL;
1533
1534         smb_fname = fsp->fsp_name;
1535         if (!shadow_copy2_strip_snapshot(talloc_tos(),
1536                                         handle,
1537                                         smb_fname,
1538                                         &timestamp,
1539                                         NULL)) {
1540                 return -1;
1541         }
1542         if (timestamp != 0) {
1543                 errno = EROFS;
1544                 return -1;
1545         }
1546         return SMB_VFS_NEXT_FCHMOD(handle, fsp, mode);
1547 }
1548
1549 static void store_cwd_data(vfs_handle_struct *handle,
1550                                 const char *connectpath)
1551 {
1552         struct shadow_copy2_private *priv = NULL;
1553         struct smb_filename *cwd_fname = NULL;
1554
1555         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1556                                 return);
1557
1558         TALLOC_FREE(priv->shadow_cwd);
1559         cwd_fname = SMB_VFS_NEXT_GETWD(handle, talloc_tos());
1560         if (cwd_fname == NULL) {
1561                 smb_panic("getwd failed\n");
1562         }
1563         DBG_DEBUG("shadow cwd = %s\n", cwd_fname->base_name);
1564         priv->shadow_cwd = talloc_strdup(priv, cwd_fname->base_name);
1565         TALLOC_FREE(cwd_fname);
1566         if (priv->shadow_cwd == NULL) {
1567                 smb_panic("talloc failed\n");
1568         }
1569         TALLOC_FREE(priv->shadow_connectpath);
1570         if (connectpath) {
1571                 DBG_DEBUG("shadow connectpath = %s\n", connectpath);
1572                 priv->shadow_connectpath = talloc_strdup(priv, connectpath);
1573                 if (priv->shadow_connectpath == NULL) {
1574                         smb_panic("talloc failed\n");
1575                 }
1576         }
1577 }
1578
1579 static int shadow_copy2_chdir(vfs_handle_struct *handle,
1580                                const struct smb_filename *smb_fname)
1581 {
1582         time_t timestamp = 0;
1583         char *stripped = NULL;
1584         char *snappath = NULL;
1585         int ret = -1;
1586         int saved_errno = 0;
1587         char *conv = NULL;
1588         size_t rootpath_len = 0;
1589         struct smb_filename *conv_smb_fname = NULL;
1590
1591         if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
1592                                         handle,
1593                                         smb_fname,
1594                                         &timestamp,
1595                                         &stripped,
1596                                         &snappath,
1597                                         NULL)) {
1598                 return -1;
1599         }
1600         if (stripped != NULL) {
1601                 conv = shadow_copy2_do_convert(talloc_tos(),
1602                                                 handle,
1603                                                 stripped,
1604                                                 timestamp,
1605                                                 &rootpath_len);
1606                 TALLOC_FREE(stripped);
1607                 if (conv == NULL) {
1608                         return -1;
1609                 }
1610                 conv_smb_fname = synthetic_smb_fname(talloc_tos(),
1611                                         conv,
1612                                         NULL,
1613                                         NULL,
1614                                         0,
1615                                         smb_fname->flags);
1616         } else {
1617                 conv_smb_fname = cp_smb_filename(talloc_tos(), smb_fname);
1618         }
1619
1620         if (conv_smb_fname == NULL) {
1621                 TALLOC_FREE(conv);
1622                 errno = ENOMEM;
1623                 return -1;
1624         }
1625
1626         ret = SMB_VFS_NEXT_CHDIR(handle, conv_smb_fname);
1627         if (ret == -1) {
1628                 saved_errno = errno;
1629         }
1630
1631         if (ret == 0) {
1632                 if (conv != NULL && rootpath_len != 0) {
1633                         conv[rootpath_len] = '\0';
1634                 } else if (snappath != 0) {
1635                         TALLOC_FREE(conv);
1636                         conv = snappath;
1637                 }
1638                 store_cwd_data(handle, conv);
1639         }
1640
1641         TALLOC_FREE(stripped);
1642         TALLOC_FREE(conv);
1643         TALLOC_FREE(conv_smb_fname);
1644
1645         if (saved_errno != 0) {
1646                 errno = saved_errno;
1647         }
1648         return ret;
1649 }
1650
1651 static int shadow_copy2_fntimes(vfs_handle_struct *handle,
1652                                 files_struct *fsp,
1653                                 struct smb_file_time *ft)
1654 {
1655         time_t timestamp = 0;
1656
1657         if (!shadow_copy2_strip_snapshot(talloc_tos(),
1658                                          handle,
1659                                          fsp->fsp_name,
1660                                          &timestamp,
1661                                          NULL)) {
1662                 return -1;
1663         }
1664         if (timestamp != 0) {
1665                 errno = EROFS;
1666                 return -1;
1667         }
1668         return SMB_VFS_NEXT_FNTIMES(handle, fsp, ft);
1669 }
1670
1671 static int shadow_copy2_readlinkat(vfs_handle_struct *handle,
1672                                 const struct files_struct *dirfsp,
1673                                 const struct smb_filename *smb_fname,
1674                                 char *buf,
1675                                 size_t bufsiz)
1676 {
1677         time_t timestamp = 0;
1678         char *stripped = NULL;
1679         int saved_errno = 0;
1680         int ret;
1681         struct smb_filename *full_fname = NULL;
1682         struct smb_filename *conv = NULL;
1683
1684         full_fname = full_path_from_dirfsp_atname(talloc_tos(),
1685                                                   dirfsp,
1686                                                   smb_fname);
1687         if (full_fname == NULL) {
1688                 errno = ENOMEM;
1689                 return -1;
1690         }
1691
1692         if (!shadow_copy2_strip_snapshot(talloc_tos(),
1693                                         handle,
1694                                         full_fname,
1695                                         &timestamp,
1696                                         &stripped)) {
1697                 TALLOC_FREE(full_fname);
1698                 return -1;
1699         }
1700
1701         if (timestamp == 0) {
1702                 TALLOC_FREE(full_fname);
1703                 TALLOC_FREE(stripped);
1704                 return SMB_VFS_NEXT_READLINKAT(handle,
1705                                 dirfsp,
1706                                 smb_fname,
1707                                 buf,
1708                                 bufsiz);
1709         }
1710         conv = cp_smb_filename(talloc_tos(), full_fname);
1711         if (conv == NULL) {
1712                 TALLOC_FREE(full_fname);
1713                 TALLOC_FREE(stripped);
1714                 errno = ENOMEM;
1715                 return -1;
1716         }
1717         TALLOC_FREE(full_fname);
1718         conv->base_name = shadow_copy2_convert(
1719                 conv, handle, stripped, timestamp);
1720         TALLOC_FREE(stripped);
1721         if (conv->base_name == NULL) {
1722                 return -1;
1723         }
1724         ret = SMB_VFS_NEXT_READLINKAT(handle,
1725                                 handle->conn->cwd_fsp,
1726                                 conv,
1727                                 buf,
1728                                 bufsiz);
1729         if (ret == -1) {
1730                 saved_errno = errno;
1731         }
1732         TALLOC_FREE(conv);
1733         if (saved_errno != 0) {
1734                 errno = saved_errno;
1735         }
1736         return ret;
1737 }
1738
1739 static int shadow_copy2_mknodat(vfs_handle_struct *handle,
1740                         files_struct *dirfsp,
1741                         const struct smb_filename *smb_fname,
1742                         mode_t mode,
1743                         SMB_DEV_T dev)
1744 {
1745         time_t timestamp = 0;
1746
1747         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1748                                          smb_fname,
1749                                          &timestamp, NULL)) {
1750                 return -1;
1751         }
1752         if (timestamp != 0) {
1753                 errno = EROFS;
1754                 return -1;
1755         }
1756         return SMB_VFS_NEXT_MKNODAT(handle,
1757                         dirfsp,
1758                         smb_fname,
1759                         mode,
1760                         dev);
1761 }
1762
1763 static struct smb_filename *shadow_copy2_realpath(vfs_handle_struct *handle,
1764                                 TALLOC_CTX *ctx,
1765                                 const struct smb_filename *smb_fname)
1766 {
1767         time_t timestamp = 0;
1768         char *stripped = NULL;
1769         struct smb_filename *result_fname = NULL;
1770         struct smb_filename *conv_fname = NULL;
1771         int saved_errno = 0;
1772
1773         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
1774                                 smb_fname,
1775                                 &timestamp, &stripped)) {
1776                 goto done;
1777         }
1778         if (timestamp == 0) {
1779                 return SMB_VFS_NEXT_REALPATH(handle, ctx, smb_fname);
1780         }
1781
1782         conv_fname = cp_smb_filename(talloc_tos(), smb_fname);
1783         if (conv_fname == NULL) {
1784                 goto done;
1785         }
1786         conv_fname->base_name = shadow_copy2_convert(
1787                 conv_fname, handle, stripped, timestamp);
1788         if (conv_fname->base_name == NULL) {
1789                 goto done;
1790         }
1791
1792         result_fname = SMB_VFS_NEXT_REALPATH(handle, ctx, conv_fname);
1793
1794 done:
1795         if (result_fname == NULL) {
1796                 saved_errno = errno;
1797         }
1798         TALLOC_FREE(conv_fname);
1799         TALLOC_FREE(stripped);
1800         if (saved_errno != 0) {
1801                 errno = saved_errno;
1802         }
1803         return result_fname;
1804 }
1805
1806 /**
1807  * Check whether a given directory contains a
1808  * snapshot directory as direct subdirectory.
1809  * If yes, return the path of the snapshot-subdir,
1810  * otherwise return NULL.
1811  */
1812 static char *have_snapdir(struct vfs_handle_struct *handle,
1813                           const char *path)
1814 {
1815         struct smb_filename smb_fname;
1816         int ret;
1817         struct shadow_copy2_private *priv;
1818
1819         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1820                                 return NULL);
1821
1822         ZERO_STRUCT(smb_fname);
1823         smb_fname.base_name = talloc_asprintf(talloc_tos(), "%s/%s",
1824                                               path, priv->config->snapdir);
1825         if (smb_fname.base_name == NULL) {
1826                 return NULL;
1827         }
1828
1829         ret = SMB_VFS_NEXT_STAT(handle, &smb_fname);
1830         if ((ret == 0) && (S_ISDIR(smb_fname.st.st_ex_mode))) {
1831                 return smb_fname.base_name;
1832         }
1833         TALLOC_FREE(smb_fname.base_name);
1834         return NULL;
1835 }
1836
1837 /**
1838  * Find the snapshot directory (if any) for the given
1839  * filename (which is relative to the share).
1840  */
1841 static const char *shadow_copy2_find_snapdir(TALLOC_CTX *mem_ctx,
1842                                              struct vfs_handle_struct *handle,
1843                                              struct smb_filename *smb_fname)
1844 {
1845         char *path, *p;
1846         const char *snapdir;
1847         struct shadow_copy2_config *config;
1848         struct shadow_copy2_private *priv;
1849
1850         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1851                                 return NULL);
1852
1853         config = priv->config;
1854
1855         /*
1856          * If the non-snapdisrseverywhere mode, we should not search!
1857          */
1858         if (!config->snapdirseverywhere) {
1859                 return config->snapshot_basepath;
1860         }
1861
1862         path = talloc_asprintf(mem_ctx, "%s/%s",
1863                                handle->conn->connectpath,
1864                                smb_fname->base_name);
1865         if (path == NULL) {
1866                 return NULL;
1867         }
1868
1869         snapdir = have_snapdir(handle, path);
1870         if (snapdir != NULL) {
1871                 TALLOC_FREE(path);
1872                 return snapdir;
1873         }
1874
1875         while ((p = strrchr(path, '/')) && (p > path)) {
1876
1877                 p[0] = '\0';
1878
1879                 snapdir = have_snapdir(handle, path);
1880                 if (snapdir != NULL) {
1881                         TALLOC_FREE(path);
1882                         return snapdir;
1883                 }
1884         }
1885         TALLOC_FREE(path);
1886         return NULL;
1887 }
1888
1889 static bool shadow_copy2_snapshot_to_gmt(vfs_handle_struct *handle,
1890                                          const char *name,
1891                                          char *gmt, size_t gmt_len)
1892 {
1893         struct tm timestamp;
1894         time_t timestamp_t;
1895         unsigned long int timestamp_long;
1896         const char *fmt;
1897         struct shadow_copy2_config *config;
1898         struct shadow_copy2_private *priv;
1899         char *tmpstr = NULL;
1900         char *tmp = NULL;
1901         bool converted = false;
1902         int ret = -1;
1903
1904         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1905                                 return NULL);
1906
1907         config = priv->config;
1908
1909         fmt = config->gmt_format;
1910
1911         /*
1912          * If regex is provided, then we will have to parse the
1913          * filename which will contain both the prefix and the time format.
1914          * e.g. <prefix><delimiter><time_format>
1915          */
1916         if (priv->snaps->regex != NULL) {
1917                 tmpstr = talloc_strdup(talloc_tos(), name);
1918                 /* point "name" to the time format */
1919                 name = strstr(name, priv->config->delimiter);
1920                 if (name == NULL) {
1921                         goto done;
1922                 }
1923                 /* Extract the prefix */
1924                 tmp = strstr(tmpstr, priv->config->delimiter);
1925                 if (tmp == NULL) {
1926                         goto done;
1927                 }
1928                 *tmp = '\0';
1929
1930                 /* Parse regex */
1931                 ret = regexec(priv->snaps->regex, tmpstr, 0, NULL, 0);
1932                 if (ret) {
1933                         DBG_DEBUG("shadow_copy2_snapshot_to_gmt: "
1934                                   "no regex match for %s\n", tmpstr);
1935                         goto done;
1936                 }
1937         }
1938
1939         ZERO_STRUCT(timestamp);
1940         if (config->use_sscanf) {
1941                 if (sscanf(name, fmt, &timestamp_long) != 1) {
1942                         DEBUG(10, ("shadow_copy2_snapshot_to_gmt: "
1943                                    "no sscanf match %s: %s\n",
1944                                    fmt, name));
1945                         goto done;
1946                 }
1947                 timestamp_t = timestamp_long;
1948                 gmtime_r(&timestamp_t, &timestamp);
1949         } else {
1950                 if (strptime(name, fmt, &timestamp) == NULL) {
1951                         DEBUG(10, ("shadow_copy2_snapshot_to_gmt: "
1952                                    "no match %s: %s\n",
1953                                    fmt, name));
1954                         goto done;
1955                 }
1956                 DEBUG(10, ("shadow_copy2_snapshot_to_gmt: match %s: %s\n",
1957                            fmt, name));
1958
1959                 if (config->use_localtime) {
1960                         timestamp.tm_isdst = -1;
1961                         timestamp_t = mktime(&timestamp);
1962                         gmtime_r(&timestamp_t, &timestamp);
1963                 }
1964         }
1965
1966         strftime(gmt, gmt_len, GMT_FORMAT, &timestamp);
1967         converted = true;
1968
1969 done:
1970         TALLOC_FREE(tmpstr);
1971         return converted;
1972 }
1973
1974 static int shadow_copy2_label_cmp_asc(const void *x, const void *y)
1975 {
1976         return strncmp((const char *)x, (const char *)y, sizeof(SHADOW_COPY_LABEL));
1977 }
1978
1979 static int shadow_copy2_label_cmp_desc(const void *x, const void *y)
1980 {
1981         return -strncmp((const char *)x, (const char *)y, sizeof(SHADOW_COPY_LABEL));
1982 }
1983
1984 /*
1985   sort the shadow copy data in ascending or descending order
1986  */
1987 static void shadow_copy2_sort_data(vfs_handle_struct *handle,
1988                                    struct shadow_copy_data *shadow_copy2_data)
1989 {
1990         int (*cmpfunc)(const void *, const void *);
1991         const char *sort;
1992         struct shadow_copy2_private *priv;
1993
1994         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
1995                                 return);
1996
1997         sort = priv->config->sort_order;
1998         if (sort == NULL) {
1999                 return;
2000         }
2001
2002         if (strcmp(sort, "asc") == 0) {
2003                 cmpfunc = shadow_copy2_label_cmp_asc;
2004         } else if (strcmp(sort, "desc") == 0) {
2005                 cmpfunc = shadow_copy2_label_cmp_desc;
2006         } else {
2007                 return;
2008         }
2009
2010         if (shadow_copy2_data && shadow_copy2_data->num_volumes > 0 &&
2011             shadow_copy2_data->labels)
2012         {
2013                 TYPESAFE_QSORT(shadow_copy2_data->labels,
2014                                shadow_copy2_data->num_volumes,
2015                                cmpfunc);
2016         }
2017 }
2018
2019 static int shadow_copy2_get_shadow_copy_data(
2020         vfs_handle_struct *handle, files_struct *fsp,
2021         struct shadow_copy_data *shadow_copy2_data,
2022         bool labels)
2023 {
2024         DIR *p = NULL;
2025         const char *snapdir;
2026         struct smb_filename *snapdir_smb_fname = NULL;
2027         struct files_struct *dirfsp = NULL;
2028         struct files_struct *fspcwd = NULL;
2029         struct dirent *d;
2030         TALLOC_CTX *tmp_ctx = talloc_stackframe();
2031         struct shadow_copy2_private *priv = NULL;
2032         struct shadow_copy2_snapentry *tmpentry = NULL;
2033         bool get_snaplist = false;
2034         int open_flags = O_RDONLY;
2035         int fd;
2036         int ret = -1;
2037         NTSTATUS status;
2038         int saved_errno = 0;
2039
2040         snapdir = shadow_copy2_find_snapdir(tmp_ctx, handle, fsp->fsp_name);
2041         if (snapdir == NULL) {
2042                 DEBUG(0,("shadow:snapdir not found for %s in get_shadow_copy_data\n",
2043                          handle->conn->connectpath));
2044                 errno = EINVAL;
2045                 goto done;
2046         }
2047
2048         snapdir_smb_fname = synthetic_smb_fname(talloc_tos(),
2049                                         snapdir,
2050                                         NULL,
2051                                         NULL,
2052                                         0,
2053                                         fsp->fsp_name->flags);
2054         if (snapdir_smb_fname == NULL) {
2055                 errno = ENOMEM;
2056                 goto done;
2057         }
2058
2059         status = create_internal_dirfsp(handle->conn,
2060                                         snapdir_smb_fname,
2061                                         &dirfsp);
2062         if (!NT_STATUS_IS_OK(status)) {
2063                 DBG_WARNING("create_internal_dir_fsp() failed for '%s'"
2064                             " - %s\n", snapdir, nt_errstr(status));
2065                 errno = ENOSYS;
2066                 goto done;
2067         }
2068
2069         status = vfs_at_fspcwd(talloc_tos(), handle->conn, &fspcwd);
2070         if (!NT_STATUS_IS_OK(status)) {
2071                 errno = ENOMEM;
2072                 goto done;
2073         }
2074
2075 #ifdef O_DIRECTORY
2076         open_flags |= O_DIRECTORY;
2077 #endif
2078
2079         fd = SMB_VFS_NEXT_OPENAT(handle,
2080                                  fspcwd,
2081                                  snapdir_smb_fname,
2082                                  dirfsp,
2083                                  open_flags,
2084                                  0);
2085         if (fd == -1) {
2086                 DBG_WARNING("SMB_VFS_NEXT_OPEN failed for '%s'"
2087                             " - %s\n", snapdir, strerror(errno));
2088                 errno = ENOSYS;
2089                 goto done;
2090         }
2091         fsp_set_fd(dirfsp, fd);
2092
2093         /* Now we have the handle, check access here. */
2094         status = smbd_check_access_rights_fsp(fspcwd,
2095                                         dirfsp,
2096                                         false,
2097                                         SEC_DIR_LIST);
2098         if (!NT_STATUS_IS_OK(status)) {
2099                 DBG_ERR("user does not have list permission "
2100                         "on snapdir %s\n",
2101                         fsp_str_dbg(dirfsp));
2102                 errno = EACCES;
2103                 goto done;
2104         }
2105
2106         p = SMB_VFS_NEXT_FDOPENDIR(handle, dirfsp, NULL, 0);
2107         if (!p) {
2108                 DBG_NOTICE("shadow_copy2: SMB_VFS_NEXT_FDOPENDIR() failed for '%s'"
2109                            " - %s\n", snapdir, strerror(errno));
2110                 errno = ENOSYS;
2111                 goto done;
2112         }
2113
2114         if (shadow_copy2_data != NULL) {
2115                 shadow_copy2_data->num_volumes = 0;
2116                 shadow_copy2_data->labels      = NULL;
2117         }
2118
2119         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
2120                                 goto done);
2121
2122         /*
2123          * Normally this function is called twice once with labels = false and
2124          * then with labels = true. When labels is false it will return the
2125          * number of volumes so that the caller can allocate memory for that
2126          * many labels. Therefore to eliminate snaplist both the times it is
2127          * good to check if labels is set or not.
2128          *
2129          * shadow_copy2_data is NULL when we only want to update the list and
2130          * don't want any labels.
2131          */
2132         if ((priv->snaps->regex != NULL) && (labels || shadow_copy2_data == NULL)) {
2133                 get_snaplist = true;
2134                 /* Reset the global snaplist */
2135                 shadow_copy2_delete_snaplist(priv);
2136
2137                 /* Set the current time as snaplist update time */
2138                 time(&(priv->snaps->fetch_time));
2139         }
2140
2141         while ((d = SMB_VFS_NEXT_READDIR(handle, dirfsp, p, NULL))) {
2142                 char snapshot[GMT_NAME_LEN+1];
2143                 SHADOW_COPY_LABEL *tlabels;
2144
2145                 /*
2146                  * ignore names not of the right form in the snapshot
2147                  * directory
2148                  */
2149                 if (!shadow_copy2_snapshot_to_gmt(
2150                             handle, d->d_name,
2151                             snapshot, sizeof(snapshot))) {
2152
2153                         DEBUG(6, ("shadow_copy2_get_shadow_copy_data: "
2154                                   "ignoring %s\n", d->d_name));
2155                         continue;
2156                 }
2157                 DEBUG(6,("shadow_copy2_get_shadow_copy_data: %s -> %s\n",
2158                          d->d_name, snapshot));
2159
2160                 if (get_snaplist) {
2161                         /*
2162                          * Create a snap entry for each successful
2163                          * pattern match.
2164                          */
2165                         tmpentry = shadow_copy2_create_snapentry(priv);
2166                         if (tmpentry == NULL) {
2167                                 DBG_ERR("talloc_zero() failed\n");
2168                                 goto done;
2169                         }
2170                         tmpentry->snapname = talloc_strdup(tmpentry, d->d_name);
2171                         tmpentry->time_fmt = talloc_strdup(tmpentry, snapshot);
2172                 }
2173
2174                 if (shadow_copy2_data == NULL) {
2175                         continue;
2176                 }
2177
2178                 if (!labels) {
2179                         /* the caller doesn't want the labels */
2180                         shadow_copy2_data->num_volumes++;
2181                         continue;
2182                 }
2183
2184                 tlabels = talloc_realloc(shadow_copy2_data,
2185                                          shadow_copy2_data->labels,
2186                                          SHADOW_COPY_LABEL,
2187                                          shadow_copy2_data->num_volumes+1);
2188                 if (tlabels == NULL) {
2189                         DEBUG(0,("shadow_copy2: out of memory\n"));
2190                         goto done;
2191                 }
2192
2193                 strlcpy(tlabels[shadow_copy2_data->num_volumes], snapshot,
2194                         sizeof(*tlabels));
2195
2196                 shadow_copy2_data->num_volumes++;
2197                 shadow_copy2_data->labels = tlabels;
2198         }
2199
2200         shadow_copy2_sort_data(handle, shadow_copy2_data);
2201         ret = 0;
2202
2203 done:
2204         if (ret != 0) {
2205                 saved_errno = errno;
2206         }
2207         TALLOC_FREE(fspcwd );
2208         if (p != NULL) {
2209                 SMB_VFS_NEXT_CLOSEDIR(handle, p);
2210                 p = NULL;
2211                 if (dirfsp != NULL) {
2212                         /*
2213                          * VFS_CLOSEDIR implicitly
2214                          * closed the associated fd.
2215                          */
2216                         fsp_set_fd(dirfsp, -1);
2217                 }
2218         }
2219         if (dirfsp != NULL) {
2220                 fd_close(dirfsp);
2221                 file_free(NULL, dirfsp);
2222         }
2223         TALLOC_FREE(tmp_ctx);
2224         if (saved_errno != 0) {
2225                 errno = saved_errno;
2226         }
2227         return ret;
2228 }
2229
2230 static int shadow_copy2_mkdirat(vfs_handle_struct *handle,
2231                                 struct files_struct *dirfsp,
2232                                 const struct smb_filename *smb_fname,
2233                                 mode_t mode)
2234 {
2235         struct smb_filename *full_fname = NULL;
2236         time_t timestamp = 0;
2237
2238         full_fname = full_path_from_dirfsp_atname(talloc_tos(),
2239                                                   dirfsp,
2240                                                   smb_fname);
2241         if (full_fname == NULL) {
2242                 errno = ENOMEM;
2243                 return -1;
2244         }
2245
2246         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2247                                         handle,
2248                                         full_fname,
2249                                         &timestamp,
2250                                         NULL)) {
2251                 return -1;
2252         }
2253         TALLOC_FREE(full_fname);
2254         if (timestamp != 0) {
2255                 errno = EROFS;
2256                 return -1;
2257         }
2258         return SMB_VFS_NEXT_MKDIRAT(handle,
2259                         dirfsp,
2260                         smb_fname,
2261                         mode);
2262 }
2263
2264 static int shadow_copy2_fchflags(vfs_handle_struct *handle,
2265                                 struct files_struct *fsp,
2266                                 unsigned int flags)
2267 {
2268         time_t timestamp = 0;
2269
2270         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2271                                         handle,
2272                                         fsp->fsp_name,
2273                                         &timestamp,
2274                                         NULL)) {
2275                 return -1;
2276         }
2277         if (timestamp != 0) {
2278                 errno = EROFS;
2279                 return -1;
2280         }
2281         return SMB_VFS_NEXT_FCHFLAGS(handle, fsp, flags);
2282 }
2283
2284 static int shadow_copy2_fsetxattr(struct vfs_handle_struct *handle,
2285                                  struct files_struct *fsp,
2286                                  const char *aname, const void *value,
2287                                  size_t size, int flags)
2288 {
2289         time_t timestamp = 0;
2290         const struct smb_filename *smb_fname = NULL;
2291
2292         smb_fname = fsp->fsp_name;
2293         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2294                                 handle,
2295                                 smb_fname,
2296                                 &timestamp,
2297                                 NULL)) {
2298                 return -1;
2299         }
2300         if (timestamp != 0) {
2301                 errno = EROFS;
2302                 return -1;
2303         }
2304         return SMB_VFS_NEXT_FSETXATTR(handle, fsp,
2305                                 aname, value, size, flags);
2306 }
2307
2308 static NTSTATUS shadow_copy2_create_dfs_pathat(struct vfs_handle_struct *handle,
2309                                 struct files_struct *dirfsp,
2310                                 const struct smb_filename *smb_fname,
2311                                 const struct referral *reflist,
2312                                 size_t referral_count)
2313 {
2314         time_t timestamp = 0;
2315
2316         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2317                                         handle,
2318                                         smb_fname,
2319                                         &timestamp,
2320                                         NULL)) {
2321                 return NT_STATUS_NO_MEMORY;
2322         }
2323         if (timestamp != 0) {
2324                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
2325         }
2326         return SMB_VFS_NEXT_CREATE_DFS_PATHAT(handle,
2327                         dirfsp,
2328                         smb_fname,
2329                         reflist,
2330                         referral_count);
2331 }
2332
2333 static NTSTATUS shadow_copy2_read_dfs_pathat(struct vfs_handle_struct *handle,
2334                                 TALLOC_CTX *mem_ctx,
2335                                 struct files_struct *dirfsp,
2336                                 struct smb_filename *smb_fname,
2337                                 struct referral **ppreflist,
2338                                 size_t *preferral_count)
2339 {
2340         time_t timestamp = 0;
2341         char *stripped = NULL;
2342         struct smb_filename *full_fname = NULL;
2343         struct smb_filename *conv = NULL;
2344         NTSTATUS status;
2345
2346         full_fname = full_path_from_dirfsp_atname(talloc_tos(),
2347                                                   dirfsp,
2348                                                   smb_fname);
2349         if (full_fname == NULL) {
2350                 return NT_STATUS_NO_MEMORY;
2351         }
2352
2353         if (!shadow_copy2_strip_snapshot(mem_ctx,
2354                                         handle,
2355                                         full_fname,
2356                                         &timestamp,
2357                                         &stripped)) {
2358                 TALLOC_FREE(full_fname);
2359                 return NT_STATUS_NO_MEMORY;
2360         }
2361         if (timestamp == 0) {
2362                 TALLOC_FREE(full_fname);
2363                 TALLOC_FREE(stripped);
2364                 return SMB_VFS_NEXT_READ_DFS_PATHAT(handle,
2365                                         mem_ctx,
2366                                         dirfsp,
2367                                         smb_fname,
2368                                         ppreflist,
2369                                         preferral_count);
2370         }
2371
2372         conv = cp_smb_filename(mem_ctx, full_fname);
2373         if (conv == NULL) {
2374                 TALLOC_FREE(full_fname);
2375                 TALLOC_FREE(stripped);
2376                 return NT_STATUS_NO_MEMORY;
2377         }
2378         TALLOC_FREE(full_fname);
2379         conv->base_name = shadow_copy2_convert(conv,
2380                                         handle,
2381                                         stripped,
2382                                         timestamp);
2383         TALLOC_FREE(stripped);
2384         if (conv->base_name == NULL) {
2385                 TALLOC_FREE(conv);
2386                 return NT_STATUS_NO_MEMORY;
2387         }
2388
2389         status = SMB_VFS_NEXT_READ_DFS_PATHAT(handle,
2390                                 mem_ctx,
2391                                 handle->conn->cwd_fsp,
2392                                 conv,
2393                                 ppreflist,
2394                                 preferral_count);
2395
2396         if (NT_STATUS_IS_OK(status)) {
2397                 /* Return any stat(2) info. */
2398                 smb_fname->st = conv->st;
2399         }
2400
2401         TALLOC_FREE(conv);
2402         return status;
2403 }
2404
2405 static int shadow_copy2_get_real_filename(struct vfs_handle_struct *handle,
2406                                           const struct smb_filename *fname,
2407                                           const char *name,
2408                                           TALLOC_CTX *mem_ctx,
2409                                           char **found_name)
2410 {
2411         struct shadow_copy2_private *priv = NULL;
2412         struct shadow_copy2_config *config = NULL;
2413         time_t timestamp = 0;
2414         char *stripped = NULL;
2415         ssize_t ret;
2416         int saved_errno = 0;
2417         char *conv;
2418         struct smb_filename conv_fname;
2419
2420         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
2421                                 return -1);
2422         config = priv->config;
2423
2424         DBG_DEBUG("Path=[%s] name=[%s]\n", smb_fname_str_dbg(fname), name);
2425
2426         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, fname,
2427                                          &timestamp, &stripped)) {
2428                 DEBUG(10, ("shadow_copy2_strip_snapshot failed\n"));
2429                 return -1;
2430         }
2431         if (timestamp == 0) {
2432                 DEBUG(10, ("timestamp == 0\n"));
2433                 return SMB_VFS_NEXT_GET_REAL_FILENAME(handle, fname, name,
2434                                                       mem_ctx, found_name);
2435         }
2436
2437         /*
2438          * Note that stripped may be an empty string "" if path was ".". As
2439          * shadow_copy2_convert() combines "" with the shadow-copy tree connect
2440          * root fullpath and get_real_filename_full_scan() has an explicit check
2441          * for "" this works.
2442          */
2443         DBG_DEBUG("stripped [%s]\n", stripped);
2444
2445         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2446         if (conv == NULL) {
2447                 if (!config->snapdirseverywhere) {
2448                         DBG_DEBUG("shadow_copy2_convert [%s] failed\n", stripped);
2449                         return -1;
2450                 }
2451
2452                 /*
2453                  * We're called in the path traversal loop in unix_convert()
2454                  * walking down the directory hierarchy. shadow_copy2_convert()
2455                  * will fail if the snapshot directory is futher down in the
2456                  * hierachy. Set conv to the original stripped path and try to
2457                  * look it up in the filesystem with
2458                  * SMB_VFS_NEXT_GET_REAL_FILENAME() or
2459                  * get_real_filename_full_scan().
2460                  */
2461                 DBG_DEBUG("Use stripped [%s] as conv\n", stripped);
2462                 conv = talloc_strdup(talloc_tos(), stripped);
2463                 if (conv == NULL) {
2464                         TALLOC_FREE(stripped);
2465                         return -1;
2466                 }
2467         }
2468
2469         conv_fname = (struct smb_filename) {
2470                 .base_name = conv,
2471         };
2472
2473         DEBUG(10, ("Calling NEXT_GET_REAL_FILE_NAME for conv=[%s], "
2474                    "name=[%s]\n", conv, name));
2475         ret = SMB_VFS_NEXT_GET_REAL_FILENAME(handle, &conv_fname, name,
2476                                              mem_ctx, found_name);
2477         DEBUG(10, ("NEXT_REAL_FILE_NAME returned %d\n", (int)ret));
2478         if (ret == 0) {
2479                 return 0;
2480         }
2481         if (errno != EOPNOTSUPP) {
2482                 TALLOC_FREE(conv);
2483                 errno = EOPNOTSUPP;
2484                 return -1;
2485         }
2486
2487         ret = get_real_filename_full_scan(handle->conn,
2488                                           conv,
2489                                           name,
2490                                           false,
2491                                           mem_ctx,
2492                                           found_name);
2493         if (ret != 0) {
2494                 saved_errno = errno;
2495                 DBG_DEBUG("Scan [%s] for [%s] failed\n",
2496                           conv, name);
2497                 errno = saved_errno;
2498                 return -1;
2499         }
2500
2501         DBG_DEBUG("Scan [%s] for [%s] returned [%s]\n",
2502                   conv, name, *found_name);
2503
2504         TALLOC_FREE(conv);
2505         return 0;
2506 }
2507
2508 static const char *shadow_copy2_connectpath(struct vfs_handle_struct *handle,
2509                                         const struct smb_filename *smb_fname_in)
2510 {
2511         time_t timestamp = 0;
2512         char *stripped = NULL;
2513         char *tmp = NULL;
2514         const char *fname = smb_fname_in->base_name;
2515         struct smb_filename smb_fname = {0};
2516         struct smb_filename *result_fname = NULL;
2517         char *result = NULL;
2518         char *parent_dir = NULL;
2519         int saved_errno = 0;
2520         size_t rootpath_len = 0;
2521         struct shadow_copy2_private *priv = NULL;
2522
2523         SMB_VFS_HANDLE_GET_DATA(handle, priv, struct shadow_copy2_private,
2524                                 return NULL);
2525
2526         DBG_DEBUG("Calc connect path for [%s]\n", fname);
2527
2528         if (priv->shadow_connectpath != NULL) {
2529                 DBG_DEBUG("cached connect path is [%s]\n",
2530                         priv->shadow_connectpath);
2531                 return priv->shadow_connectpath;
2532         }
2533
2534         if (!shadow_copy2_strip_snapshot(talloc_tos(), handle, smb_fname_in,
2535                                          &timestamp, &stripped)) {
2536                 goto done;
2537         }
2538         if (timestamp == 0) {
2539                 return SMB_VFS_NEXT_CONNECTPATH(handle, smb_fname_in);
2540         }
2541
2542         tmp = shadow_copy2_do_convert(talloc_tos(), handle, stripped, timestamp,
2543                                       &rootpath_len);
2544         if (tmp == NULL) {
2545                 if (errno != ENOENT) {
2546                         goto done;
2547                 }
2548
2549                 /*
2550                  * If the converted path does not exist, and converting
2551                  * the parent yields something that does exist, then
2552                  * this path refers to something that has not been
2553                  * created yet, relative to the parent path.
2554                  * The snapshot finding is relative to the parent.
2555                  * (usually snapshots are read/only but this is not
2556                  * necessarily true).
2557                  * This code also covers getting a wildcard in the
2558                  * last component, because this function is called
2559                  * prior to sanitizing the path, and in SMB1 we may
2560                  * get wildcards in path names.
2561                  */
2562                 if (!parent_dirname(talloc_tos(), stripped, &parent_dir,
2563                                     NULL)) {
2564                         errno = ENOMEM;
2565                         goto done;
2566                 }
2567
2568                 tmp = shadow_copy2_do_convert(talloc_tos(), handle, parent_dir,
2569                                               timestamp, &rootpath_len);
2570                 if (tmp == NULL) {
2571                         goto done;
2572                 }
2573         }
2574
2575         DBG_DEBUG("converted path is [%s] root path is [%.*s]\n", tmp,
2576                   (int)rootpath_len, tmp);
2577
2578         tmp[rootpath_len] = '\0';
2579         smb_fname = (struct smb_filename) { .base_name = tmp };
2580
2581         result_fname = SMB_VFS_NEXT_REALPATH(handle, priv, &smb_fname);
2582         if (result_fname == NULL) {
2583                 goto done;
2584         }
2585
2586         /*
2587          * SMB_VFS_NEXT_REALPATH returns a talloc'ed string.
2588          * Don't leak memory.
2589          */
2590         TALLOC_FREE(priv->shadow_realpath);
2591         priv->shadow_realpath = result_fname;
2592         result = priv->shadow_realpath->base_name;
2593
2594         DBG_DEBUG("connect path is [%s]\n", result);
2595
2596 done:
2597         if (result == NULL) {
2598                 saved_errno = errno;
2599         }
2600         TALLOC_FREE(tmp);
2601         TALLOC_FREE(stripped);
2602         TALLOC_FREE(parent_dir);
2603         if (saved_errno != 0) {
2604                 errno = saved_errno;
2605         }
2606         return result;
2607 }
2608
2609 static NTSTATUS shadow_copy2_parent_pathname(vfs_handle_struct *handle,
2610                                              TALLOC_CTX *ctx,
2611                                              const struct smb_filename *smb_fname_in,
2612                                              struct smb_filename **parent_dir_out,
2613                                              struct smb_filename **atname_out)
2614 {
2615         time_t timestamp = 0;
2616         char *stripped = NULL;
2617         char *converted_name = NULL;
2618         struct smb_filename *smb_fname = NULL;
2619         struct smb_filename *parent = NULL;
2620         struct smb_filename *atname = NULL;
2621         struct shadow_copy2_private *priv = NULL;
2622         bool ok = false;
2623         bool is_converted = false;
2624         NTSTATUS status = NT_STATUS_OK;
2625         TALLOC_CTX *frame = NULL;
2626
2627         SMB_VFS_HANDLE_GET_DATA(handle,
2628                                 priv,
2629                                 struct shadow_copy2_private,
2630                                 return NT_STATUS_INTERNAL_ERROR);
2631
2632         frame = talloc_stackframe();
2633
2634         smb_fname = cp_smb_filename(frame, smb_fname_in);
2635         if (smb_fname == NULL) {
2636                 status = NT_STATUS_NO_MEMORY;
2637                 goto fail;
2638         }
2639
2640         /* First, call the default PARENT_PATHNAME. */
2641         status = SMB_VFS_NEXT_PARENT_PATHNAME(handle,
2642                                               frame,
2643                                               smb_fname,
2644                                               &parent,
2645                                               &atname);
2646         if (!NT_STATUS_IS_OK(status)) {
2647                 goto fail;
2648         }
2649
2650         if (parent->twrp == 0) {
2651                 /*
2652                  * Parent is not a snapshot path, return
2653                  * the regular result.
2654                  */
2655                 status = NT_STATUS_OK;
2656                 goto out;
2657         }
2658
2659         /* See if we can find a snapshot for the parent. */
2660         ok = shadow_copy2_strip_snapshot_converted(frame,
2661                                                    handle,
2662                                                    parent,
2663                                                    &timestamp,
2664                                                    &stripped,
2665                                                    &is_converted);
2666         if (!ok) {
2667                 status = map_nt_error_from_unix(errno);
2668                 goto fail;
2669         }
2670
2671         if (is_converted) {
2672                 /*
2673                  * Already found snapshot for parent so wipe
2674                  * out the twrp.
2675                  */
2676                 parent->twrp = 0;
2677                 goto out;
2678         }
2679
2680         converted_name = shadow_copy2_convert(frame,
2681                                               handle,
2682                                               stripped,
2683                                               timestamp);
2684
2685         if (converted_name == NULL) {
2686                 /*
2687                  * Can't find snapshot for parent so wipe
2688                  * out the twrp.
2689                  */
2690                 parent->twrp = 0;
2691         }
2692
2693   out:
2694
2695         *parent_dir_out = talloc_move(ctx, &parent);
2696         if (atname_out != NULL) {
2697                 *atname_out = talloc_move(*parent_dir_out, &atname);
2698         }
2699
2700   fail:
2701
2702         TALLOC_FREE(frame);
2703         return status;
2704 }
2705
2706 static uint64_t shadow_copy2_disk_free(vfs_handle_struct *handle,
2707                                 const struct smb_filename *smb_fname,
2708                                 uint64_t *bsize,
2709                                 uint64_t *dfree,
2710                                 uint64_t *dsize)
2711 {
2712         time_t timestamp = 0;
2713         char *stripped = NULL;
2714         int saved_errno = 0;
2715         char *conv = NULL;
2716         struct smb_filename *conv_smb_fname = NULL;
2717         uint64_t ret = (uint64_t)-1;
2718
2719         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2720                                 handle,
2721                                 smb_fname,
2722                                 &timestamp,
2723                                 &stripped)) {
2724                 return (uint64_t)-1;
2725         }
2726         if (timestamp == 0) {
2727                 return SMB_VFS_NEXT_DISK_FREE(handle, smb_fname,
2728                                               bsize, dfree, dsize);
2729         }
2730         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2731         TALLOC_FREE(stripped);
2732         if (conv == NULL) {
2733                 return (uint64_t)-1;
2734         }
2735         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2736                                         conv,
2737                                         NULL,
2738                                         NULL,
2739                                         0,
2740                                         smb_fname->flags);
2741         if (conv_smb_fname == NULL) {
2742                 TALLOC_FREE(conv);
2743                 return (uint64_t)-1;
2744         }
2745         ret = SMB_VFS_NEXT_DISK_FREE(handle, conv_smb_fname,
2746                                 bsize, dfree, dsize);
2747         if (ret == (uint64_t)-1) {
2748                 saved_errno = errno;
2749         }
2750         TALLOC_FREE(conv);
2751         TALLOC_FREE(conv_smb_fname);
2752         if (saved_errno != 0) {
2753                 errno = saved_errno;
2754         }
2755         return ret;
2756 }
2757
2758 static int shadow_copy2_get_quota(vfs_handle_struct *handle,
2759                                 const struct smb_filename *smb_fname,
2760                                 enum SMB_QUOTA_TYPE qtype,
2761                                 unid_t id,
2762                                 SMB_DISK_QUOTA *dq)
2763 {
2764         time_t timestamp = 0;
2765         char *stripped = NULL;
2766         int ret;
2767         int saved_errno = 0;
2768         char *conv;
2769         struct smb_filename *conv_smb_fname = NULL;
2770
2771         if (!shadow_copy2_strip_snapshot(talloc_tos(),
2772                                 handle,
2773                                 smb_fname,
2774                                 &timestamp,
2775                                 &stripped)) {
2776                 return -1;
2777         }
2778         if (timestamp == 0) {
2779                 return SMB_VFS_NEXT_GET_QUOTA(handle, smb_fname, qtype, id, dq);
2780         }
2781
2782         conv = shadow_copy2_convert(talloc_tos(), handle, stripped, timestamp);
2783         TALLOC_FREE(stripped);
2784         if (conv == NULL) {
2785                 return -1;
2786         }
2787         conv_smb_fname = synthetic_smb_fname(talloc_tos(),
2788                                         conv,
2789                                         NULL,
2790                                         NULL,
2791                                         0,
2792                                         smb_fname->flags);
2793         if (conv_smb_fname == NULL) {
2794                 TALLOC_FREE(conv);
2795                 return -1;
2796         }
2797         ret = SMB_VFS_NEXT_GET_QUOTA(handle, conv_smb_fname, qtype, id, dq);
2798
2799         if (ret == -1) {
2800                 saved_errno = errno;
2801         }
2802         TALLOC_FREE(conv);
2803         TALLOC_FREE(conv_smb_fname);
2804         if (saved_errno != 0) {
2805                 errno = saved_errno;
2806         }
2807
2808         return ret;
2809 }
2810
2811 static ssize_t shadow_copy2_pwrite(vfs_handle_struct *handle,
2812                                    files_struct *fsp,
2813                                    const void *data,
2814                                    size_t n,
2815                                    off_t offset)
2816 {
2817         ssize_t nwritten;
2818
2819         nwritten = SMB_VFS_NEXT_PWRITE(handle, fsp, data, n, offset);
2820         if (nwritten == -1) {
2821                 if (errno == EBADF && fsp->fsp_flags.can_write) {
2822                         errno = EROFS;
2823                 }
2824         }
2825
2826         return nwritten;
2827 }
2828
2829 struct shadow_copy2_pwrite_state {
2830         vfs_handle_struct *handle;
2831         files_struct *fsp;
2832         ssize_t ret;
2833         struct vfs_aio_state vfs_aio_state;
2834 };
2835
2836 static void shadow_copy2_pwrite_done(struct tevent_req *subreq);
2837
2838 static struct tevent_req *shadow_copy2_pwrite_send(
2839         struct vfs_handle_struct *handle, TALLOC_CTX *mem_ctx,
2840         struct tevent_context *ev, struct files_struct *fsp,
2841         const void *data, size_t n, off_t offset)
2842 {
2843         struct tevent_req *req = NULL, *subreq = NULL;
2844         struct shadow_copy2_pwrite_state *state = NULL;
2845
2846         req = tevent_req_create(mem_ctx, &state,
2847                                 struct shadow_copy2_pwrite_state);
2848         if (req == NULL) {
2849                 return NULL;
2850         }
2851         state->handle = handle;
2852         state->fsp = fsp;
2853
2854         subreq = SMB_VFS_NEXT_PWRITE_SEND(state,
2855                                           ev,
2856                                           handle,
2857                                           fsp,
2858                                           data,
2859                                           n,
2860                                           offset);
2861         if (tevent_req_nomem(subreq, req)) {
2862                 return tevent_req_post(req, ev);
2863         }
2864         tevent_req_set_callback(subreq, shadow_copy2_pwrite_done, req);
2865
2866         return req;
2867 }
2868
2869 static void shadow_copy2_pwrite_done(struct tevent_req *subreq)
2870 {
2871         struct tevent_req *req = tevent_req_callback_data(
2872                 subreq, struct tevent_req);
2873         struct shadow_copy2_pwrite_state *state = tevent_req_data(
2874                 req, struct shadow_copy2_pwrite_state);
2875
2876         state->ret = SMB_VFS_PWRITE_RECV(subreq, &state->vfs_aio_state);
2877         TALLOC_FREE(subreq);
2878         if (state->ret == -1) {
2879                 tevent_req_error(req, state->vfs_aio_state.error);
2880                 return;
2881         }
2882
2883         tevent_req_done(req);
2884 }
2885
2886 static ssize_t shadow_copy2_pwrite_recv(struct tevent_req *req,
2887                                           struct vfs_aio_state *vfs_aio_state)
2888 {
2889         struct shadow_copy2_pwrite_state *state = tevent_req_data(
2890                 req, struct shadow_copy2_pwrite_state);
2891
2892         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
2893                 if ((vfs_aio_state->error == EBADF) &&
2894                     state->fsp->fsp_flags.can_write)
2895                 {
2896                         vfs_aio_state->error = EROFS;
2897                         errno = EROFS;
2898                 }
2899                 return -1;
2900         }
2901
2902         *vfs_aio_state = state->vfs_aio_state;
2903         return state->ret;
2904 }
2905
2906 static int shadow_copy2_connect(struct vfs_handle_struct *handle,
2907                                 const char *service, const char *user)
2908 {
2909         struct shadow_copy2_config *config;
2910         struct shadow_copy2_private *priv;
2911         int ret;
2912         const char *snapdir;
2913         const char *snapprefix = NULL;
2914         const char *delimiter;
2915         const char *gmt_format;
2916         const char *sort_order;
2917         const char *basedir = NULL;
2918         const char *snapsharepath = NULL;
2919         const char *mount_point;
2920
2921         DEBUG(10, (__location__ ": cnum[%u], connectpath[%s]\n",
2922                    (unsigned)handle->conn->cnum,
2923                    handle->conn->connectpath));
2924
2925         ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
2926         if (ret < 0) {
2927                 return ret;
2928         }
2929
2930         priv = talloc_zero(handle->conn, struct shadow_copy2_private);
2931         if (priv == NULL) {
2932                 DBG_ERR("talloc_zero() failed\n");
2933                 errno = ENOMEM;
2934                 return -1;
2935         }
2936
2937         priv->snaps = talloc_zero(priv, struct shadow_copy2_snaplist_info);
2938         if (priv->snaps == NULL) {
2939                 DBG_ERR("talloc_zero() failed\n");
2940                 errno = ENOMEM;
2941                 return -1;
2942         }
2943
2944         config = talloc_zero(priv, struct shadow_copy2_config);
2945         if (config == NULL) {
2946                 DEBUG(0, ("talloc_zero() failed\n"));
2947                 errno = ENOMEM;
2948                 return -1;
2949         }
2950
2951         priv->config = config;
2952
2953         gmt_format = lp_parm_const_string(SNUM(handle->conn),
2954                                           "shadow", "format",
2955                                           GMT_FORMAT);
2956         config->gmt_format = talloc_strdup(config, gmt_format);
2957         if (config->gmt_format == NULL) {
2958                 DEBUG(0, ("talloc_strdup() failed\n"));
2959                 errno = ENOMEM;
2960                 return -1;
2961         }
2962
2963         /* config->gmt_format must not contain a path separator. */
2964         if (strchr(config->gmt_format, '/') != NULL) {
2965                 DEBUG(0, ("shadow:format %s must not contain a /"
2966                         "character. Unable to initialize module.\n",
2967                         config->gmt_format));
2968                 errno = EINVAL;
2969                 return -1;
2970         }
2971
2972         config->use_sscanf = lp_parm_bool(SNUM(handle->conn),
2973                                           "shadow", "sscanf", false);
2974
2975         config->use_localtime = lp_parm_bool(SNUM(handle->conn),
2976                                              "shadow", "localtime",
2977                                              false);
2978
2979         snapdir = lp_parm_const_string(SNUM(handle->conn),
2980                                        "shadow", "snapdir",
2981                                        ".snapshots");
2982         config->snapdir = talloc_strdup(config, snapdir);
2983         if (config->snapdir == NULL) {
2984                 DEBUG(0, ("talloc_strdup() failed\n"));
2985                 errno = ENOMEM;
2986                 return -1;
2987         }
2988
2989         snapprefix = lp_parm_const_string(SNUM(handle->conn),
2990                                        "shadow", "snapprefix",
2991                                        NULL);
2992         if (snapprefix != NULL) {
2993                 priv->snaps->regex = talloc_zero(priv->snaps, regex_t);
2994                 if (priv->snaps->regex == NULL) {
2995                         DBG_ERR("talloc_zero() failed\n");
2996                         errno = ENOMEM;
2997                         return -1;
2998                 }
2999
3000                 /* pre-compute regex rule for matching pattern later */
3001                 ret = regcomp(priv->snaps->regex, snapprefix, 0);
3002                 if (ret) {
3003                         DBG_ERR("Failed to create regex object\n");
3004                         return -1;
3005                 }
3006         }
3007
3008         delimiter = lp_parm_const_string(SNUM(handle->conn),
3009                                        "shadow", "delimiter",
3010                                        "_GMT");
3011         if (delimiter != NULL) {
3012                 priv->config->delimiter = talloc_strdup(priv->config, delimiter);
3013                 if (priv->config->delimiter == NULL) {
3014                         DBG_ERR("talloc_strdup() failed\n");
3015                         errno = ENOMEM;
3016                         return -1;
3017                 }
3018         }
3019
3020         config->snapdirseverywhere = lp_parm_bool(SNUM(handle->conn),
3021                                                   "shadow",
3022                                                   "snapdirseverywhere",
3023                                                   false);
3024
3025         config->crossmountpoints = lp_parm_bool(SNUM(handle->conn),
3026                                                 "shadow", "crossmountpoints",
3027                                                 false);
3028
3029         if (config->crossmountpoints && !config->snapdirseverywhere) {
3030                 DBG_WARNING("Warning: 'crossmountpoints' depends on "
3031                             "'snapdirseverywhere'. Disabling crossmountpoints.\n");
3032         }
3033
3034         config->fixinodes = lp_parm_bool(SNUM(handle->conn),
3035                                          "shadow", "fixinodes",
3036                                          false);
3037
3038         sort_order = lp_parm_const_string(SNUM(handle->conn),
3039                                           "shadow", "sort", "desc");
3040         config->sort_order = talloc_strdup(config, sort_order);
3041         if (config->sort_order == NULL) {
3042                 DEBUG(0, ("talloc_strdup() failed\n"));
3043                 errno = ENOMEM;
3044                 return -1;
3045         }
3046
3047         mount_point = lp_parm_const_string(SNUM(handle->conn),
3048                                            "shadow", "mountpoint", NULL);
3049         if (mount_point != NULL) {
3050                 if (mount_point[0] != '/') {
3051                         DEBUG(1, (__location__ " Warning: 'mountpoint' is "
3052                                   "relative ('%s'), but it has to be an "
3053                                   "absolute path. Ignoring provided value.\n",
3054                                   mount_point));
3055                         mount_point = NULL;
3056                 } else {
3057                         char *p;
3058                         p = strstr(handle->conn->connectpath, mount_point);
3059                         if (p != handle->conn->connectpath) {
3060                                 DBG_WARNING("Warning: the share root (%s) is "
3061                                             "not a subdirectory of the "
3062                                             "specified mountpoint (%s). "
3063                                             "Ignoring provided value.\n",
3064                                             handle->conn->connectpath,
3065                                             mount_point);
3066                                 mount_point = NULL;
3067                         }
3068                 }
3069         }
3070
3071         if (mount_point != NULL) {
3072                 config->mount_point = talloc_strdup(config, mount_point);
3073                 if (config->mount_point == NULL) {
3074                         DEBUG(0, (__location__ " talloc_strdup() failed\n"));
3075                         return -1;
3076                 }
3077         } else {
3078                 config->mount_point = shadow_copy2_find_mount_point(config,
3079                                                                     handle);
3080                 if (config->mount_point == NULL) {
3081                         DBG_WARNING("shadow_copy2_find_mount_point "
3082                                     "of the share root '%s' failed: %s\n",
3083                                     handle->conn->connectpath, strerror(errno));
3084                         return -1;
3085                 }
3086         }
3087
3088         basedir = lp_parm_const_string(SNUM(handle->conn),
3089                                        "shadow", "basedir", NULL);
3090
3091         if (basedir != NULL) {
3092                 if (basedir[0] != '/') {
3093                         DEBUG(1, (__location__ " Warning: 'basedir' is "
3094                                   "relative ('%s'), but it has to be an "
3095                                   "absolute path. Disabling basedir.\n",
3096                                   basedir));
3097                         basedir = NULL;
3098                 } else {
3099                         char *p;
3100                         p = strstr(basedir, config->mount_point);
3101                         if (p != basedir) {
3102                                 DEBUG(1, ("Warning: basedir (%s) is not a "
3103                                           "subdirectory of the share root's "
3104                                           "mount point (%s). "
3105                                           "Disabling basedir\n",
3106                                           basedir, config->mount_point));
3107                                 basedir = NULL;
3108                         }
3109                 }
3110         }
3111
3112         if (config->snapdirseverywhere && basedir != NULL) {
3113                 DEBUG(1, (__location__ " Warning: 'basedir' is incompatible "
3114                           "with 'snapdirseverywhere'. Disabling basedir.\n"));
3115                 basedir = NULL;
3116         }
3117
3118         snapsharepath = lp_parm_const_string(SNUM(handle->conn), "shadow",
3119                                              "snapsharepath", NULL);
3120         if (snapsharepath != NULL) {
3121                 if (snapsharepath[0] == '/') {
3122                         DBG_WARNING("Warning: 'snapsharepath' is "
3123                                     "absolute ('%s'), but it has to be a "
3124                                     "relative path. Disabling snapsharepath.\n",
3125                                     snapsharepath);
3126                         snapsharepath = NULL;
3127                 }
3128                 if (config->snapdirseverywhere && snapsharepath != NULL) {
3129                         DBG_WARNING("Warning: 'snapsharepath' is incompatible "
3130                                     "with 'snapdirseverywhere'. Disabling "
3131                                     "snapsharepath.\n");
3132                         snapsharepath = NULL;
3133                 }
3134         }
3135
3136         if (basedir != NULL && snapsharepath != NULL) {
3137                 DBG_WARNING("Warning: 'snapsharepath' is incompatible with "
3138                             "'basedir'. Disabling snapsharepath\n");
3139                 snapsharepath = NULL;
3140         }
3141
3142         if (snapsharepath != NULL) {
3143                 config->rel_connectpath = talloc_strdup(config, snapsharepath);
3144                 if (config->rel_connectpath == NULL) {
3145                         DBG_ERR("talloc_strdup() failed\n");
3146                         errno = ENOMEM;
3147                         return -1;
3148                 }
3149         }
3150
3151         if (basedir == NULL) {
3152                 basedir = config->mount_point;
3153         }
3154
3155         if (config->rel_connectpath == NULL &&
3156             strlen(basedir) < strlen(handle->conn->connectpath)) {
3157                 config->rel_connectpath = talloc_strdup(config,
3158                         handle->conn->connectpath + strlen(basedir));
3159                 if (config->rel_connectpath == NULL) {
3160                         DEBUG(0, ("talloc_strdup() failed\n"));
3161                         errno = ENOMEM;
3162                         return -1;
3163                 }
3164         }
3165
3166         if (config->snapdir[0] == '/') {
3167                 config->snapdir_absolute = true;
3168
3169                 if (config->snapdirseverywhere == true) {
3170                         DEBUG(1, (__location__ " Warning: An absolute snapdir "
3171                                   "is incompatible with 'snapdirseverywhere', "
3172                                   "setting 'snapdirseverywhere' to false.\n"));
3173                         config->snapdirseverywhere = false;
3174                 }
3175
3176                 if (config->crossmountpoints == true) {
3177                         DEBUG(1, (__location__ " Warning: 'crossmountpoints' "
3178                                   "is not supported with an absolute snapdir. "
3179                                   "Disabling it.\n"));
3180                         config->crossmountpoints = false;
3181                 }
3182
3183                 config->snapshot_basepath = config->snapdir;
3184         } else {
3185                 config->snapshot_basepath = talloc_asprintf(config, "%s/%s",
3186                                 config->mount_point, config->snapdir);
3187                 if (config->snapshot_basepath == NULL) {
3188                         DEBUG(0, ("talloc_asprintf() failed\n"));
3189                         errno = ENOMEM;
3190                         return -1;
3191                 }
3192         }
3193
3194         trim_string(config->mount_point, NULL, "/");
3195         trim_string(config->rel_connectpath, "/", "/");
3196         trim_string(config->snapdir, NULL, "/");
3197         trim_string(config->snapshot_basepath, NULL, "/");
3198
3199         DEBUG(10, ("shadow_copy2_connect: configuration:\n"
3200                    "  share root: '%s'\n"
3201                    "  mountpoint: '%s'\n"
3202                    "  rel share root: '%s'\n"
3203                    "  snapdir: '%s'\n"
3204                    "  snapprefix: '%s'\n"
3205                    "  delimiter: '%s'\n"
3206                    "  snapshot base path: '%s'\n"
3207                    "  format: '%s'\n"
3208                    "  use sscanf: %s\n"
3209                    "  snapdirs everywhere: %s\n"
3210                    "  cross mountpoints: %s\n"
3211                    "  fix inodes: %s\n"
3212                    "  sort order: %s\n"
3213                    "",
3214                    handle->conn->connectpath,
3215                    config->mount_point,
3216                    config->rel_connectpath,
3217                    config->snapdir,
3218                    snapprefix,
3219                    config->delimiter,
3220                    config->snapshot_basepath,
3221                    config->gmt_format,
3222                    config->use_sscanf ? "yes" : "no",
3223                    config->snapdirseverywhere ? "yes" : "no",
3224                    config->crossmountpoints ? "yes" : "no",
3225                    config->fixinodes ? "yes" : "no",
3226                    config->sort_order
3227                    ));
3228
3229
3230         SMB_VFS_HANDLE_SET_DATA(handle, priv,
3231                                 NULL, struct shadow_copy2_private,
3232                                 return -1);
3233
3234         return 0;
3235 }
3236
3237 static struct vfs_fn_pointers vfs_shadow_copy2_fns = {
3238         .connect_fn = shadow_copy2_connect,
3239         .disk_free_fn = shadow_copy2_disk_free,
3240         .get_quota_fn = shadow_copy2_get_quota,
3241         .create_dfs_pathat_fn = shadow_copy2_create_dfs_pathat,
3242         .read_dfs_pathat_fn = shadow_copy2_read_dfs_pathat,
3243         .renameat_fn = shadow_copy2_renameat,
3244         .linkat_fn = shadow_copy2_linkat,
3245         .symlinkat_fn = shadow_copy2_symlinkat,
3246         .stat_fn = shadow_copy2_stat,
3247         .lstat_fn = shadow_copy2_lstat,
3248         .fstat_fn = shadow_copy2_fstat,
3249         .openat_fn = shadow_copy2_openat,
3250         .unlinkat_fn = shadow_copy2_unlinkat,
3251         .fchmod_fn = shadow_copy2_fchmod,
3252         .chdir_fn = shadow_copy2_chdir,
3253         .fntimes_fn = shadow_copy2_fntimes,
3254         .readlinkat_fn = shadow_copy2_readlinkat,
3255         .mknodat_fn = shadow_copy2_mknodat,
3256         .realpath_fn = shadow_copy2_realpath,
3257         .get_shadow_copy_data_fn = shadow_copy2_get_shadow_copy_data,
3258         .mkdirat_fn = shadow_copy2_mkdirat,
3259         .getxattrat_send_fn = vfs_not_implemented_getxattrat_send,
3260         .getxattrat_recv_fn = vfs_not_implemented_getxattrat_recv,
3261         .fsetxattr_fn = shadow_copy2_fsetxattr,
3262         .fchflags_fn = shadow_copy2_fchflags,
3263         .get_real_filename_fn = shadow_copy2_get_real_filename,
3264         .pwrite_fn = shadow_copy2_pwrite,
3265         .pwrite_send_fn = shadow_copy2_pwrite_send,
3266         .pwrite_recv_fn = shadow_copy2_pwrite_recv,
3267         .connectpath_fn = shadow_copy2_connectpath,
3268         .parent_pathname_fn = shadow_copy2_parent_pathname,
3269 };
3270
3271 static_decl_vfs;
3272 NTSTATUS vfs_shadow_copy2_init(TALLOC_CTX *ctx)
3273 {
3274         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION,
3275                                 "shadow_copy2", &vfs_shadow_copy2_fns);
3276 }