source3/modules/vfs_streams_depot.c

   1 /*
   2  * Store streams in a separate subdirectory
   3  *
   4  * Copyright (C) Volker Lendecke, 2007
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "includes.h"
  21 #include "smbd/smbd.h"
  22 #include "system/filesys.h"
  23
  24 #undef DBGC_CLASS
  25 #define DBGC_CLASS DBGC_VFS
  26
  27 /*
  28  * Excerpt from a mail from tridge:
  29  *
  30  * Volker, what I'm thinking of is this:
  31  * /mount-point/.streams/XX/YY/aaaa.bbbb/namedstream1
  32  * /mount-point/.streams/XX/YY/aaaa.bbbb/namedstream2
  33  *
  34  * where XX/YY is a 2 level hash based on the fsid/inode. "aaaa.bbbb"
  35  * is the fsid/inode. "namedstreamX" is a file named after the stream
  36  * name.
  37  */
  38
  39 static uint32_t hash_fn(DATA_BLOB key)
  40 {
  41         uint32_t value; /* Used to compute the hash value.  */
  42         uint32_t i;     /* Used to cycle through random values. */
  43
  44         /* Set the initial value from the key size. */
  45         for (value = 0x238F13AF * key.length, i=0; i < key.length; i++)
  46                 value = (value + (key.data[i] << (i*5 % 24)));
  47
  48         return (1103515243 * value + 12345);
  49 }
  50
  51 /*
  52  * With the hashing scheme based on the inode we need to protect against
  53  * streams showing up on files with re-used inodes. This can happen if we
  54  * create a stream directory from within Samba, and a local process or NFS
  55  * client deletes the file without deleting the streams directory. When the
  56  * inode is re-used and the stream directory is still around, the streams in
  57  * there would be show up as belonging to the new file.
  58  *
  59  * There are several workarounds for this, probably the easiest one is on
  60  * systems which have a true birthtime stat element: When the file has a later
  61  * birthtime than the streams directory, then we have to recreate the
  62  * directory.
  63  *
  64  * The other workaround is to somehow mark the file as generated by Samba with
  65  * something that a NFS client would not do. The closest one is a special
  66  * xattr value being set. On systems which do not support xattrs, it might be
  67  * an option to put in a special ACL entry for a non-existing group.
  68  */
  69
  70 static bool file_is_valid(vfs_handle_struct *handle, const char *path)
  71 {
  72         char buf;
  73
  74         DEBUG(10, ("file_is_valid (%s) called\n", path));
  75
  76         if (SMB_VFS_GETXATTR(handle->conn, path, SAMBA_XATTR_MARKER,
  77                                   &buf, sizeof(buf)) != sizeof(buf)) {
  78                 DEBUG(10, ("GETXATTR failed: %s\n", strerror(errno)));
  79                 return false;
  80         }
  81
  82         if (buf != '1') {
  83                 DEBUG(10, ("got wrong buffer content: '%c'\n", buf));
  84                 return false;
  85         }
  86
  87         return true;
  88 }
  89
  90 static bool mark_file_valid(vfs_handle_struct *handle, const char *path)
  91 {
  92         char buf = '1';
  93         int ret;
  94
  95         DEBUG(10, ("marking file %s as valid\n", path));
  96
  97         ret = SMB_VFS_SETXATTR(handle->conn, path, SAMBA_XATTR_MARKER,
  98                                     &buf, sizeof(buf), 0);
  99
 100         if (ret == -1) {
 101                 DEBUG(10, ("SETXATTR failed: %s\n", strerror(errno)));
 102                 return false;
 103         }
 104
 105         return true;
 106 }
 107
 108 /**
 109  * Given an smb_filename, determine the stream directory using the file's
 110  * base_name.
 111  */
 112 static char *stream_dir(vfs_handle_struct *handle,
 113                         const struct smb_filename *smb_fname,
 114                         const SMB_STRUCT_STAT *base_sbuf, bool create_it)
 115 {
 116         uint32_t hash;
 117         struct smb_filename *smb_fname_hash = NULL;
 118         char *result = NULL;
 119         SMB_STRUCT_STAT base_sbuf_tmp;
 120         uint8_t first, second;
 121         char *tmp;
 122         char *id_hex;
 123         struct file_id id;
 124         uint8_t id_buf[16];
 125         bool check_valid;
 126         char *rootdir = NULL;
 127         struct smb_filename *rootdir_fname = NULL;
 128         struct smb_filename *tmp_fname = NULL;
 129
 130         check_valid = lp_parm_bool(SNUM(handle->conn),
 131                       "streams_depot", "check_valid", true);
 132
 133         tmp = talloc_asprintf(talloc_tos(), "%s/.streams", handle->conn->cwd);
 134
 135         if (tmp == NULL) {
 136                 errno = ENOMEM;
 137                 goto fail;
 138         }
 139
 140         rootdir = lp_parm_talloc_string(talloc_tos(),
 141                 SNUM(handle->conn), "streams_depot", "directory",
 142                 tmp);
 143         if (rootdir == NULL) {
 144                 errno = ENOMEM;
 145                 goto fail;
 146         }
 147
 148         rootdir_fname = synthetic_smb_fname(talloc_tos(),
 149                                         rootdir,
 150                                         NULL,
 151                                         NULL,
 152                                         smb_fname->flags);
 153         if (rootdir_fname == NULL) {
 154                 errno = ENOMEM;
 155                 goto fail;
 156         }
 157
 158         /* Stat the base file if it hasn't already been done. */
 159         if (base_sbuf == NULL) {
 160                 struct smb_filename *smb_fname_base;
 161
 162                 smb_fname_base = synthetic_smb_fname(
 163                                         talloc_tos(),
 164                                         smb_fname->base_name,
 165                                         NULL,
 166                                         NULL,
 167                                         smb_fname->flags);
 168                 if (smb_fname_base == NULL) {
 169                         errno = ENOMEM;
 170                         goto fail;
 171                 }
 172                 if (SMB_VFS_NEXT_STAT(handle, smb_fname_base) == -1) {
 173                         TALLOC_FREE(smb_fname_base);
 174                         goto fail;
 175                 }
 176                 base_sbuf_tmp = smb_fname_base->st;
 177                 TALLOC_FREE(smb_fname_base);
 178         } else {
 179                 base_sbuf_tmp = *base_sbuf;
 180         }
 181
 182         id = SMB_VFS_FILE_ID_CREATE(handle->conn, &base_sbuf_tmp);
 183
 184         push_file_id_16((char *)id_buf, &id);
 185
 186         hash = hash_fn(data_blob_const(id_buf, sizeof(id_buf)));
 187
 188         first = hash & 0xff;
 189         second = (hash >> 8) & 0xff;
 190
 191         id_hex = hex_encode_talloc(talloc_tos(), id_buf, sizeof(id_buf));
 192
 193         if (id_hex == NULL) {
 194                 errno = ENOMEM;
 195                 goto fail;
 196         }
 197
 198         result = talloc_asprintf(talloc_tos(), "%s/%2.2X/%2.2X/%s", rootdir,
 199                                  first, second, id_hex);
 200
 201         TALLOC_FREE(id_hex);
 202
 203         if (result == NULL) {
 204                 errno = ENOMEM;
 205                 return NULL;
 206         }
 207
 208         smb_fname_hash = synthetic_smb_fname(talloc_tos(),
 209                                         result,
 210                                         NULL,
 211                                         NULL,
 212                                         smb_fname->flags);
 213         if (smb_fname_hash == NULL) {
 214                 errno = ENOMEM;
 215                 goto fail;
 216         }
 217
 218         if (SMB_VFS_NEXT_STAT(handle, smb_fname_hash) == 0) {
 219                 struct smb_filename *smb_fname_new = NULL;
 220                 char *newname;
 221                 bool delete_lost;
 222
 223                 if (!S_ISDIR(smb_fname_hash->st.st_ex_mode)) {
 224                         errno = EINVAL;
 225                         goto fail;
 226                 }
 227
 228                 if (!check_valid ||
 229                     file_is_valid(handle, smb_fname->base_name)) {
 230                         return result;
 231                 }
 232
 233                 /*
 234                  * Someone has recreated a file under an existing inode
 235                  * without deleting the streams directory.
 236                  * Move it away or remove if streams_depot:delete_lost is set.
 237                  */
 238
 239         again:
 240                 delete_lost = lp_parm_bool(SNUM(handle->conn), "streams_depot",
 241                                            "delete_lost", false);
 242
 243                 if (delete_lost) {
 244                         DEBUG(3, ("Someone has recreated a file under an "
 245                               "existing inode. Removing: %s\n",
 246                               smb_fname_hash->base_name));
 247                         recursive_rmdir(talloc_tos(), handle->conn,
 248                                         smb_fname_hash);
 249                         SMB_VFS_NEXT_RMDIR(handle, smb_fname_hash);
 250                 } else {
 251                         newname = talloc_asprintf(talloc_tos(), "lost-%lu",
 252                                                   random());
 253                         DEBUG(3, ("Someone has recreated a file under an "
 254                               "existing inode. Renaming: %s to: %s\n",
 255                               smb_fname_hash->base_name,
 256                               newname));
 257                         if (newname == NULL) {
 258                                 errno = ENOMEM;
 259                                 goto fail;
 260                         }
 261
 262                         smb_fname_new = synthetic_smb_fname(
 263                                                 talloc_tos(),
 264                                                 newname,
 265                                                 NULL,
 266                                                 NULL,
 267                                                 smb_fname->flags);
 268                         TALLOC_FREE(newname);
 269                         if (smb_fname_new == NULL) {
 270                                 errno = ENOMEM;
 271                                 goto fail;
 272                         }
 273
 274                         if (SMB_VFS_NEXT_RENAME(handle, smb_fname_hash,
 275                                                 smb_fname_new) == -1) {
 276                                 TALLOC_FREE(smb_fname_new);
 277                                 if ((errno == EEXIST) || (errno == ENOTEMPTY)) {
 278                                         goto again;
 279                                 }
 280                                 goto fail;
 281                         }
 282
 283                         TALLOC_FREE(smb_fname_new);
 284                 }
 285         }
 286
 287         if (!create_it) {
 288                 errno = ENOENT;
 289                 goto fail;
 290         }
 291
 292         if ((SMB_VFS_NEXT_MKDIR(handle, rootdir_fname, 0755) != 0)
 293             && (errno != EEXIST)) {
 294                 goto fail;
 295         }
 296
 297         tmp = talloc_asprintf(result, "%s/%2.2X", rootdir, first);
 298         if (tmp == NULL) {
 299                 errno = ENOMEM;
 300                 goto fail;
 301         }
 302
 303         tmp_fname = synthetic_smb_fname(talloc_tos(),
 304                                         tmp,
 305                                         NULL,
 306                                         NULL,
 307                                         smb_fname->flags);
 308         if (tmp_fname == NULL) {
 309                 errno = ENOMEM;
 310                 goto fail;
 311         }
 312
 313         if ((SMB_VFS_NEXT_MKDIR(handle, tmp_fname, 0755) != 0)
 314             && (errno != EEXIST)) {
 315                 goto fail;
 316         }
 317
 318         TALLOC_FREE(tmp);
 319         TALLOC_FREE(tmp_fname);
 320
 321         tmp = talloc_asprintf(result, "%s/%2.2X/%2.2X", rootdir, first,
 322                               second);
 323         if (tmp == NULL) {
 324                 errno = ENOMEM;
 325                 goto fail;
 326         }
 327
 328         tmp_fname = synthetic_smb_fname(talloc_tos(),
 329                                         tmp,
 330                                         NULL,
 331                                         NULL,
 332                                         smb_fname->flags);
 333         if (tmp_fname == NULL) {
 334                 errno = ENOMEM;
 335                 goto fail;
 336         }
 337
 338         if ((SMB_VFS_NEXT_MKDIR(handle, tmp_fname, 0755) != 0)
 339             && (errno != EEXIST)) {
 340                 goto fail;
 341         }
 342
 343         TALLOC_FREE(tmp);
 344         TALLOC_FREE(tmp_fname);
 345
 346         /* smb_fname_hash is the struct smb_filename version of 'result' */
 347         if ((SMB_VFS_NEXT_MKDIR(handle, smb_fname_hash, 0755) != 0)
 348             && (errno != EEXIST)) {
 349                 goto fail;
 350         }
 351
 352         if (check_valid && !mark_file_valid(handle, smb_fname->base_name)) {
 353                 goto fail;
 354         }
 355
 356         TALLOC_FREE(rootdir_fname);
 357         TALLOC_FREE(rootdir);
 358         TALLOC_FREE(tmp_fname);
 359         TALLOC_FREE(smb_fname_hash);
 360         return result;
 361
 362  fail:
 363         TALLOC_FREE(rootdir_fname);
 364         TALLOC_FREE(rootdir);
 365         TALLOC_FREE(tmp_fname);
 366         TALLOC_FREE(smb_fname_hash);
 367         TALLOC_FREE(result);
 368         return NULL;
 369 }
 370 /**
 371  * Given a stream name, populate smb_fname_out with the actual location of the
 372  * stream.
 373  */
 374 static NTSTATUS stream_smb_fname(vfs_handle_struct *handle,
 375                                  const struct smb_filename *smb_fname,
 376                                  struct smb_filename **smb_fname_out,
 377                                  bool create_dir)
 378 {
 379         char *dirname, *stream_fname;
 380         const char *stype;
 381         NTSTATUS status;
 382
 383         *smb_fname_out = NULL;
 384
 385         stype = strchr_m(smb_fname->stream_name + 1, ':');
 386
 387         if (stype) {
 388                 if (strcasecmp_m(stype, ":$DATA") != 0) {
 389                         return NT_STATUS_INVALID_PARAMETER;
 390                 }
 391         }
 392
 393         dirname = stream_dir(handle, smb_fname, NULL, create_dir);
 394
 395         if (dirname == NULL) {
 396                 status = map_nt_error_from_unix(errno);
 397                 goto fail;
 398         }
 399
 400         stream_fname = talloc_asprintf(talloc_tos(), "%s/%s", dirname,
 401                                        smb_fname->stream_name);
 402
 403         if (stream_fname == NULL) {
 404                 status = NT_STATUS_NO_MEMORY;
 405                 goto fail;
 406         }
 407
 408         if (stype == NULL) {
 409                 /* Append an explicit stream type if one wasn't specified. */
 410                 stream_fname = talloc_asprintf(talloc_tos(), "%s:$DATA",
 411                                                stream_fname);
 412                 if (stream_fname == NULL) {
 413                         status = NT_STATUS_NO_MEMORY;
 414                         goto fail;
 415                 }
 416         } else {
 417                 /* Normalize the stream type to upercase. */
 418                 if (!strupper_m(strrchr_m(stream_fname, ':') + 1)) {
 419                         status = NT_STATUS_INVALID_PARAMETER;
 420                         goto fail;
 421                 }
 422         }
 423
 424         DEBUG(10, ("stream filename = %s\n", stream_fname));
 425
 426         /* Create an smb_filename with stream_name == NULL. */
 427         *smb_fname_out = synthetic_smb_fname(talloc_tos(),
 428                                         stream_fname,
 429                                         NULL,
 430                                         NULL,
 431                                         smb_fname->flags);
 432         if (*smb_fname_out == NULL) {
 433                 return NT_STATUS_NO_MEMORY;
 434         }
 435
 436         return NT_STATUS_OK;
 437
 438  fail:
 439         DEBUG(5, ("stream_name failed: %s\n", strerror(errno)));
 440         TALLOC_FREE(*smb_fname_out);
 441         return status;
 442 }
 443
 444 static NTSTATUS walk_streams(vfs_handle_struct *handle,
 445                              struct smb_filename *smb_fname_base,
 446                              char **pdirname,
 447                              bool (*fn)(const char *dirname,
 448                                         const char *dirent,
 449                                         void *private_data),
 450                              void *private_data)
 451 {
 452         char *dirname;
 453         struct smb_filename *dir_smb_fname = NULL;
 454         DIR *dirhandle = NULL;
 455         const char *dirent = NULL;
 456         char *talloced = NULL;
 457
 458         dirname = stream_dir(handle, smb_fname_base, &smb_fname_base->st,
 459                              false);
 460
 461         if (dirname == NULL) {
 462                 if (errno == ENOENT) {
 463                         /*
 464                          * no stream around
 465                          */
 466                         return NT_STATUS_OK;
 467                 }
 468                 return map_nt_error_from_unix(errno);
 469         }
 470
 471         DEBUG(10, ("walk_streams: dirname=%s\n", dirname));
 472
 473         dir_smb_fname = synthetic_smb_fname(talloc_tos(),
 474                                         dirname,
 475                                         NULL,
 476                                         NULL,
 477                                         smb_fname_base->flags);
 478         if (dir_smb_fname == NULL) {
 479                 TALLOC_FREE(dirname);
 480                 return NT_STATUS_NO_MEMORY;
 481         }
 482
 483         dirhandle = SMB_VFS_NEXT_OPENDIR(handle, dir_smb_fname, NULL, 0);
 484
 485         TALLOC_FREE(dir_smb_fname);
 486
 487         if (dirhandle == NULL) {
 488                 TALLOC_FREE(dirname);
 489                 return map_nt_error_from_unix(errno);
 490         }
 491
 492         while ((dirent = vfs_readdirname(handle->conn, dirhandle, NULL,
 493                                          &talloced)) != NULL) {
 494
 495                 if (ISDOT(dirent) || ISDOTDOT(dirent)) {
 496                         TALLOC_FREE(talloced);
 497                         continue;
 498                 }
 499
 500                 DEBUG(10, ("walk_streams: dirent=%s\n", dirent));
 501
 502                 if (!fn(dirname, dirent, private_data)) {
 503                         TALLOC_FREE(talloced);
 504                         break;
 505                 }
 506                 TALLOC_FREE(talloced);
 507         }
 508
 509         SMB_VFS_NEXT_CLOSEDIR(handle, dirhandle);
 510
 511         if (pdirname != NULL) {
 512                 *pdirname = dirname;
 513         }
 514         else {
 515                 TALLOC_FREE(dirname);
 516         }
 517
 518         return NT_STATUS_OK;
 519 }
 520
 521 /**
 522  * Helper to stat/lstat the base file of an smb_fname. This will actually
 523  * fills in the stat struct in smb_filename.
 524  */
 525 static int streams_depot_stat_base(vfs_handle_struct *handle,
 526                                    struct smb_filename *smb_fname,
 527                                    bool follow_links)
 528 {
 529         char *tmp_stream_name;
 530         int result;
 531
 532         tmp_stream_name = smb_fname->stream_name;
 533         smb_fname->stream_name = NULL;
 534         if (follow_links) {
 535                 result = SMB_VFS_NEXT_STAT(handle, smb_fname);
 536         } else {
 537                 result = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 538         }
 539         smb_fname->stream_name = tmp_stream_name;
 540         return result;
 541 }
 542
 543 static int streams_depot_stat(vfs_handle_struct *handle,
 544                               struct smb_filename *smb_fname)
 545 {
 546         struct smb_filename *smb_fname_stream = NULL;
 547         NTSTATUS status;
 548         int ret = -1;
 549
 550         DEBUG(10, ("streams_depot_stat called for [%s]\n",
 551                    smb_fname_str_dbg(smb_fname)));
 552
 553         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 554                 return SMB_VFS_NEXT_STAT(handle, smb_fname);
 555         }
 556
 557         /* If the default stream is requested, just stat the base file. */
 558         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 559                 return streams_depot_stat_base(handle, smb_fname, true);
 560         }
 561
 562         /* Stat the actual stream now. */
 563         status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
 564                                   false);
 565         if (!NT_STATUS_IS_OK(status)) {
 566                 ret = -1;
 567                 errno = map_errno_from_nt_status(status);
 568                 goto done;
 569         }
 570
 571         ret = SMB_VFS_NEXT_STAT(handle, smb_fname_stream);
 572
 573         /* Update the original smb_fname with the stat info. */
 574         smb_fname->st = smb_fname_stream->st;
 575  done:
 576         TALLOC_FREE(smb_fname_stream);
 577         return ret;
 578 }
 579
 580
 581
 582 static int streams_depot_lstat(vfs_handle_struct *handle,
 583                                struct smb_filename *smb_fname)
 584 {
 585         struct smb_filename *smb_fname_stream = NULL;
 586         NTSTATUS status;
 587         int ret = -1;
 588
 589         DEBUG(10, ("streams_depot_lstat called for [%s]\n",
 590                    smb_fname_str_dbg(smb_fname)));
 591
 592         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 593                 return SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 594         }
 595
 596         /* If the default stream is requested, just stat the base file. */
 597         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 598                 return streams_depot_stat_base(handle, smb_fname, false);
 599         }
 600
 601         /* Stat the actual stream now. */
 602         status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
 603                                   false);
 604         if (!NT_STATUS_IS_OK(status)) {
 605                 ret = -1;
 606                 errno = map_errno_from_nt_status(status);
 607                 goto done;
 608         }
 609
 610         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_stream);
 611
 612  done:
 613         TALLOC_FREE(smb_fname_stream);
 614         return ret;
 615 }
 616
 617 static int streams_depot_open(vfs_handle_struct *handle,
 618                               struct smb_filename *smb_fname,
 619                               files_struct *fsp, int flags, mode_t mode)
 620 {
 621         struct smb_filename *smb_fname_stream = NULL;
 622         struct smb_filename *smb_fname_base = NULL;
 623         NTSTATUS status;
 624         int ret = -1;
 625
 626         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 627                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 628         }
 629
 630         /* If the default stream is requested, just open the base file. */
 631         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 632                 char *tmp_stream_name;
 633
 634                 tmp_stream_name = smb_fname->stream_name;
 635                 smb_fname->stream_name = NULL;
 636                 ret = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 637                 smb_fname->stream_name = tmp_stream_name;
 638
 639                 return ret;
 640         }
 641
 642         /* Ensure the base file still exists. */
 643         smb_fname_base = synthetic_smb_fname(talloc_tos(),
 644                                         smb_fname->base_name,
 645                                         NULL,
 646                                         NULL,
 647                                         smb_fname->flags);
 648         if (smb_fname_base == NULL) {
 649                 ret = -1;
 650                 errno = ENOMEM;
 651                 goto done;
 652         }
 653
 654         ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 655         if (ret == -1) {
 656                 goto done;
 657         }
 658
 659         /* Determine the stream name, and then open it. */
 660         status = stream_smb_fname(handle, smb_fname, &smb_fname_stream, true);
 661         if (!NT_STATUS_IS_OK(status)) {
 662                 ret = -1;
 663                 errno = map_errno_from_nt_status(status);
 664                 goto done;
 665         }
 666
 667         ret = SMB_VFS_NEXT_OPEN(handle, smb_fname_stream, fsp, flags, mode);
 668
 669  done:
 670         TALLOC_FREE(smb_fname_stream);
 671         TALLOC_FREE(smb_fname_base);
 672         return ret;
 673 }
 674
 675 static int streams_depot_unlink(vfs_handle_struct *handle,
 676                                 const struct smb_filename *smb_fname)
 677 {
 678         struct smb_filename *smb_fname_base = NULL;
 679         int ret = -1;
 680
 681         DEBUG(10, ("streams_depot_unlink called for %s\n",
 682                    smb_fname_str_dbg(smb_fname)));
 683
 684         /* If there is a valid stream, just unlink the stream and return. */
 685         if (is_ntfs_stream_smb_fname(smb_fname) &&
 686             !is_ntfs_default_stream_smb_fname(smb_fname)) {
 687                 struct smb_filename *smb_fname_stream = NULL;
 688                 NTSTATUS status;
 689
 690                 status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
 691                                           false);
 692                 if (!NT_STATUS_IS_OK(status)) {
 693                         errno = map_errno_from_nt_status(status);
 694                         return -1;
 695                 }
 696
 697                 ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname_stream);
 698
 699                 TALLOC_FREE(smb_fname_stream);
 700                 return ret;
 701         }
 702
 703         /*
 704          * We potentially need to delete the per-inode streams directory
 705          */
 706
 707         smb_fname_base = synthetic_smb_fname(talloc_tos(),
 708                                         smb_fname->base_name,
 709                                         NULL,
 710                                         NULL,
 711                                         smb_fname->flags);
 712         if (smb_fname_base == NULL) {
 713                 errno = ENOMEM;
 714                 return -1;
 715         }
 716
 717         if (lp_posix_pathnames()) {
 718                 ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_base);
 719         } else {
 720                 ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 721         }
 722
 723         if (ret == -1) {
 724                 TALLOC_FREE(smb_fname_base);
 725                 return -1;
 726         }
 727
 728         ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname);
 729         if (ret == 0) {
 730                 char *dirname = stream_dir(handle, smb_fname_base,
 731                                            &smb_fname_base->st, false);
 732
 733                 if (dirname != NULL) {
 734                         struct smb_filename *smb_fname_dir =
 735                                 synthetic_smb_fname(talloc_tos(),
 736                                                 dirname,
 737                                                 NULL,
 738                                                 NULL,
 739                                                 smb_fname->flags);
 740                         if (smb_fname_dir == NULL) {
 741                                 TALLOC_FREE(smb_fname_base);
 742                                 TALLOC_FREE(dirname);
 743                                 errno = ENOMEM;
 744                                 return -1;
 745                         }
 746                         SMB_VFS_NEXT_RMDIR(handle, smb_fname_dir);
 747                         TALLOC_FREE(smb_fname_dir);
 748                 }
 749                 TALLOC_FREE(dirname);
 750         }
 751
 752         TALLOC_FREE(smb_fname_base);
 753         return ret;
 754 }
 755
 756 static int streams_depot_rmdir(vfs_handle_struct *handle,
 757                                 const struct smb_filename *smb_fname)
 758 {
 759         struct smb_filename *smb_fname_base = NULL;
 760         int ret = -1;
 761
 762         DEBUG(10, ("streams_depot_rmdir called for %s\n",
 763                 smb_fname->base_name));
 764
 765         /*
 766          * We potentially need to delete the per-inode streams directory
 767          */
 768
 769         smb_fname_base = synthetic_smb_fname(talloc_tos(),
 770                                 smb_fname->base_name,
 771                                 NULL,
 772                                 NULL,
 773                                 smb_fname->flags);
 774         if (smb_fname_base == NULL) {
 775                 errno = ENOMEM;
 776                 return -1;
 777         }
 778
 779         if (lp_posix_pathnames()) {
 780                 ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_base);
 781         } else {
 782                 ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 783         }
 784
 785         if (ret == -1) {
 786                 TALLOC_FREE(smb_fname_base);
 787                 return -1;
 788         }
 789
 790         ret = SMB_VFS_NEXT_RMDIR(handle, smb_fname_base);
 791         if (ret == 0) {
 792                 char *dirname = stream_dir(handle, smb_fname_base,
 793                                            &smb_fname_base->st, false);
 794
 795                 if (dirname != NULL) {
 796                         struct smb_filename *smb_fname_dir =
 797                                 synthetic_smb_fname(talloc_tos(),
 798                                                 dirname,
 799                                                 NULL,
 800                                                 NULL,
 801                                                 smb_fname->flags);
 802                         if (smb_fname_dir == NULL) {
 803                                 TALLOC_FREE(smb_fname_base);
 804                                 TALLOC_FREE(dirname);
 805                                 errno = ENOMEM;
 806                                 return -1;
 807                         }
 808                         SMB_VFS_NEXT_RMDIR(handle, smb_fname_dir);
 809                         TALLOC_FREE(smb_fname_dir);
 810                 }
 811                 TALLOC_FREE(dirname);
 812         }
 813
 814         TALLOC_FREE(smb_fname_base);
 815         return ret;
 816 }
 817
 818 static int streams_depot_rename(vfs_handle_struct *handle,
 819                                 const struct smb_filename *smb_fname_src,
 820                                 const struct smb_filename *smb_fname_dst)
 821 {
 822         struct smb_filename *smb_fname_src_stream = NULL;
 823         struct smb_filename *smb_fname_dst_stream = NULL;
 824         bool src_is_stream, dst_is_stream;
 825         NTSTATUS status;
 826         int ret = -1;
 827
 828         DEBUG(10, ("streams_depot_rename called for %s => %s\n",
 829                    smb_fname_str_dbg(smb_fname_src),
 830                    smb_fname_str_dbg(smb_fname_dst)));
 831
 832         src_is_stream = is_ntfs_stream_smb_fname(smb_fname_src);
 833         dst_is_stream = is_ntfs_stream_smb_fname(smb_fname_dst);
 834
 835         if (!src_is_stream && !dst_is_stream) {
 836                 return SMB_VFS_NEXT_RENAME(handle, smb_fname_src,
 837                                            smb_fname_dst);
 838         }
 839
 840         /* for now don't allow renames from or to the default stream */
 841         if (is_ntfs_default_stream_smb_fname(smb_fname_src) ||
 842             is_ntfs_default_stream_smb_fname(smb_fname_dst)) {
 843                 errno = ENOSYS;
 844                 goto done;
 845         }
 846
 847         status = stream_smb_fname(handle, smb_fname_src, &smb_fname_src_stream,
 848                                   false);
 849         if (!NT_STATUS_IS_OK(status)) {
 850                 errno = map_errno_from_nt_status(status);
 851                 goto done;
 852         }
 853
 854         status = stream_smb_fname(handle, smb_fname_dst,
 855                                   &smb_fname_dst_stream, false);
 856         if (!NT_STATUS_IS_OK(status)) {
 857                 errno = map_errno_from_nt_status(status);
 858                 goto done;
 859         }
 860
 861         ret = SMB_VFS_NEXT_RENAME(handle, smb_fname_src_stream,
 862                                   smb_fname_dst_stream);
 863
 864 done:
 865         TALLOC_FREE(smb_fname_src_stream);
 866         TALLOC_FREE(smb_fname_dst_stream);
 867         return ret;
 868 }
 869
 870 static bool add_one_stream(TALLOC_CTX *mem_ctx, unsigned int *num_streams,
 871                            struct stream_struct **streams,
 872                            const char *name, off_t size,
 873                            off_t alloc_size)
 874 {
 875         struct stream_struct *tmp;
 876
 877         tmp = talloc_realloc(mem_ctx, *streams, struct stream_struct,
 878                                    (*num_streams)+1);
 879         if (tmp == NULL) {
 880                 return false;
 881         }
 882
 883         tmp[*num_streams].name = talloc_strdup(tmp, name);
 884         if (tmp[*num_streams].name == NULL) {
 885                 return false;
 886         }
 887
 888         tmp[*num_streams].size = size;
 889         tmp[*num_streams].alloc_size = alloc_size;
 890
 891         *streams = tmp;
 892         *num_streams += 1;
 893         return true;
 894 }
 895
 896 struct streaminfo_state {
 897         TALLOC_CTX *mem_ctx;
 898         vfs_handle_struct *handle;
 899         unsigned int num_streams;
 900         struct stream_struct *streams;
 901         NTSTATUS status;
 902 };
 903
 904 static bool collect_one_stream(const char *dirname,
 905                                const char *dirent,
 906                                void *private_data)
 907 {
 908         struct streaminfo_state *state =
 909                 (struct streaminfo_state *)private_data;
 910         struct smb_filename *smb_fname = NULL;
 911         char *sname = NULL;
 912         bool ret;
 913
 914         sname = talloc_asprintf(talloc_tos(), "%s/%s", dirname, dirent);
 915         if (sname == NULL) {
 916                 state->status = NT_STATUS_NO_MEMORY;
 917                 ret = false;
 918                 goto out;
 919         }
 920
 921         smb_fname = synthetic_smb_fname(talloc_tos(), sname, NULL, NULL, 0);
 922         if (smb_fname == NULL) {
 923                 state->status = NT_STATUS_NO_MEMORY;
 924                 ret = false;
 925                 goto out;
 926         }
 927
 928         if (SMB_VFS_NEXT_STAT(state->handle, smb_fname) == -1) {
 929                 DEBUG(10, ("Could not stat %s: %s\n", sname,
 930                            strerror(errno)));
 931                 ret = true;
 932                 goto out;
 933         }
 934
 935         if (!add_one_stream(state->mem_ctx,
 936                             &state->num_streams, &state->streams,
 937                             dirent, smb_fname->st.st_ex_size,
 938                             SMB_VFS_GET_ALLOC_SIZE(state->handle->conn, NULL,
 939                                                    &smb_fname->st))) {
 940                 state->status = NT_STATUS_NO_MEMORY;
 941                 ret = false;
 942                 goto out;
 943         }
 944
 945         ret = true;
 946  out:
 947         TALLOC_FREE(sname);
 948         TALLOC_FREE(smb_fname);
 949         return ret;
 950 }
 951
 952 static NTSTATUS streams_depot_streaminfo(vfs_handle_struct *handle,
 953                                          struct files_struct *fsp,
 954                                          const struct smb_filename *smb_fname,
 955                                          TALLOC_CTX *mem_ctx,
 956                                          unsigned int *pnum_streams,
 957                                          struct stream_struct **pstreams)
 958 {
 959         struct smb_filename *smb_fname_base = NULL;
 960         int ret;
 961         NTSTATUS status;
 962         struct streaminfo_state state;
 963
 964         smb_fname_base = synthetic_smb_fname(talloc_tos(),
 965                                         smb_fname->base_name,
 966                                         NULL,
 967                                         NULL,
 968                                         smb_fname->flags);
 969         if (smb_fname_base == NULL) {
 970                 return NT_STATUS_NO_MEMORY;
 971         }
 972
 973         if ((fsp != NULL) && (fsp->fh->fd != -1)) {
 974                 ret = SMB_VFS_NEXT_FSTAT(handle, fsp, &smb_fname_base->st);
 975         }
 976         else {
 977                 if (lp_posix_pathnames()) {
 978                         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_base);
 979                 } else {
 980                         ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 981                 }
 982         }
 983
 984         if (ret == -1) {
 985                 status = map_nt_error_from_unix(errno);
 986                 goto out;
 987         }
 988
 989         state.streams = *pstreams;
 990         state.num_streams = *pnum_streams;
 991         state.mem_ctx = mem_ctx;
 992         state.handle = handle;
 993         state.status = NT_STATUS_OK;
 994
 995         if (S_ISLNK(smb_fname_base->st.st_ex_mode)) {
 996                 /*
 997                  * Currently we do't have SMB_VFS_LLISTXATTR
 998                  * inside the VFS which means there's no way
 999                  * to cope with a symlink when lp_posix_pathnames().
1000                  * returns true. For now ignore links.
1001                  * FIXME - by adding SMB_VFS_LLISTXATTR. JRA.
1002                  */
1003                 status = NT_STATUS_OK;
1004         } else {
1005                 status = walk_streams(handle, smb_fname_base, NULL, collect_one_stream,
1006                               &state);
1007         }
1008
1009         if (!NT_STATUS_IS_OK(status)) {
1010                 TALLOC_FREE(state.streams);
1011                 goto out;
1012         }
1013
1014         if (!NT_STATUS_IS_OK(state.status)) {
1015                 TALLOC_FREE(state.streams);
1016                 status = state.status;
1017                 goto out;
1018         }
1019
1020         *pnum_streams = state.num_streams;
1021         *pstreams = state.streams;
1022         status = SMB_VFS_NEXT_STREAMINFO(handle,
1023                                 fsp,
1024                                 smb_fname_base,
1025                                 mem_ctx,
1026                                 pnum_streams,
1027                                 pstreams);
1028
1029  out:
1030         TALLOC_FREE(smb_fname_base);
1031         return status;
1032 }
1033
1034 static uint32_t streams_depot_fs_capabilities(struct vfs_handle_struct *handle,
1035                         enum timestamp_set_resolution *p_ts_res)
1036 {
1037         return SMB_VFS_NEXT_FS_CAPABILITIES(handle, p_ts_res) | FILE_NAMED_STREAMS;
1038 }
1039
1040 static struct vfs_fn_pointers vfs_streams_depot_fns = {
1041         .fs_capabilities_fn = streams_depot_fs_capabilities,
1042         .open_fn = streams_depot_open,
1043         .stat_fn = streams_depot_stat,
1044         .lstat_fn = streams_depot_lstat,
1045         .unlink_fn = streams_depot_unlink,
1046         .rmdir_fn = streams_depot_rmdir,
1047         .rename_fn = streams_depot_rename,
1048         .streaminfo_fn = streams_depot_streaminfo,
1049 };
1050
1051 NTSTATUS vfs_streams_depot_init(void);
1052 NTSTATUS vfs_streams_depot_init(void)
1053 {
1054         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "streams_depot",
1055                                 &vfs_streams_depot_fns);
1056 }