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 id_buf[16];
 125         bool check_valid;
 126         const char *rootdir;
 127         NTSTATUS status;
 128
 129         check_valid = lp_parm_bool(SNUM(handle->conn),
 130                       "streams_depot", "check_valid", true);
 131
 132         tmp = talloc_asprintf(talloc_tos(), "%s/.streams", handle->conn->connectpath);
 133
 134         if (tmp == NULL) {
 135                 errno = ENOMEM;
 136                 goto fail;
 137         }
 138
 139         rootdir = lp_parm_const_string(
 140                 SNUM(handle->conn), "streams_depot", "directory",
 141                 tmp);
 142
 143         /* Stat the base file if it hasn't already been done. */
 144         if (base_sbuf == NULL) {
 145                 struct smb_filename *smb_fname_base = NULL;
 146
 147                 status = create_synthetic_smb_fname(talloc_tos(),
 148                                                     smb_fname->base_name,
 149                                                     NULL, NULL,
 150                                                     &smb_fname_base);
 151                 if (!NT_STATUS_IS_OK(status)) {
 152                         errno = map_errno_from_nt_status(status);
 153                         goto fail;
 154                 }
 155                 if (SMB_VFS_NEXT_STAT(handle, smb_fname_base) == -1) {
 156                         TALLOC_FREE(smb_fname_base);
 157                         goto fail;
 158                 }
 159                 base_sbuf_tmp = smb_fname_base->st;
 160                 TALLOC_FREE(smb_fname_base);
 161         } else {
 162                 base_sbuf_tmp = *base_sbuf;
 163         }
 164
 165         id = SMB_VFS_FILE_ID_CREATE(handle->conn, &base_sbuf_tmp);
 166
 167         push_file_id_16((char *)id_buf, &id);
 168
 169         hash = hash_fn(data_blob_const(id_buf, sizeof(id_buf)));
 170
 171         first = hash & 0xff;
 172         second = (hash >> 8) & 0xff;
 173
 174         id_hex = hex_encode_talloc(talloc_tos(), id_buf, sizeof(id_buf));
 175
 176         if (id_hex == NULL) {
 177                 errno = ENOMEM;
 178                 goto fail;
 179         }
 180
 181         result = talloc_asprintf(talloc_tos(), "%s/%2.2X/%2.2X/%s", rootdir,
 182                                  first, second, id_hex);
 183
 184         TALLOC_FREE(id_hex);
 185
 186         if (result == NULL) {
 187                 errno = ENOMEM;
 188                 return NULL;
 189         }
 190
 191         status = create_synthetic_smb_fname(talloc_tos(), result, NULL, NULL,
 192                                             &smb_fname_hash);
 193         if (!NT_STATUS_IS_OK(status)) {
 194                 errno = map_errno_from_nt_status(status);
 195                 goto fail;
 196         }
 197
 198         if (SMB_VFS_NEXT_STAT(handle, smb_fname_hash) == 0) {
 199                 struct smb_filename *smb_fname_new = NULL;
 200                 char *newname;
 201
 202                 if (!S_ISDIR(smb_fname_hash->st.st_ex_mode)) {
 203                         errno = EINVAL;
 204                         goto fail;
 205                 }
 206
 207                 if (!check_valid ||
 208                     file_is_valid(handle, smb_fname->base_name)) {
 209                         return result;
 210                 }
 211
 212                 /*
 213                  * Someone has recreated a file under an existing inode
 214                  * without deleting the streams directory. For now, just move
 215                  * it away.
 216                  */
 217
 218         again:
 219                 newname = talloc_asprintf(talloc_tos(), "lost-%lu", random());
 220                 if (newname == NULL) {
 221                         errno = ENOMEM;
 222                         goto fail;
 223                 }
 224
 225                 status = create_synthetic_smb_fname(talloc_tos(), newname,
 226                                                     NULL, NULL,
 227                                                     &smb_fname_new);
 228                 TALLOC_FREE(newname);
 229                 if (!NT_STATUS_IS_OK(status)) {
 230                         errno = map_errno_from_nt_status(status);
 231                         goto fail;
 232                 }
 233
 234                 if (SMB_VFS_NEXT_RENAME(handle, smb_fname_hash,
 235                                         smb_fname_new) == -1) {
 236                         TALLOC_FREE(smb_fname_new);
 237                         if ((errno == EEXIST) || (errno == ENOTEMPTY)) {
 238                                 goto again;
 239                         }
 240                         goto fail;
 241                 }
 242
 243                 TALLOC_FREE(smb_fname_new);
 244         }
 245
 246         if (!create_it) {
 247                 errno = ENOENT;
 248                 goto fail;
 249         }
 250
 251         if ((SMB_VFS_NEXT_MKDIR(handle, rootdir, 0755) != 0)
 252             && (errno != EEXIST)) {
 253                 goto fail;
 254         }
 255
 256         tmp = talloc_asprintf(result, "%s/%2.2X", rootdir, first);
 257         if (tmp == NULL) {
 258                 errno = ENOMEM;
 259                 goto fail;
 260         }
 261
 262         if ((SMB_VFS_NEXT_MKDIR(handle, tmp, 0755) != 0)
 263             && (errno != EEXIST)) {
 264                 goto fail;
 265         }
 266
 267         TALLOC_FREE(tmp);
 268
 269         tmp = talloc_asprintf(result, "%s/%2.2X/%2.2X", rootdir, first,
 270                               second);
 271         if (tmp == NULL) {
 272                 errno = ENOMEM;
 273                 goto fail;
 274         }
 275
 276         if ((SMB_VFS_NEXT_MKDIR(handle, tmp, 0755) != 0)
 277             && (errno != EEXIST)) {
 278                 goto fail;
 279         }
 280
 281         TALLOC_FREE(tmp);
 282
 283         if ((SMB_VFS_NEXT_MKDIR(handle, result, 0755) != 0)
 284             && (errno != EEXIST)) {
 285                 goto fail;
 286         }
 287
 288         if (check_valid && !mark_file_valid(handle, smb_fname->base_name)) {
 289                 goto fail;
 290         }
 291
 292         TALLOC_FREE(smb_fname_hash);
 293         return result;
 294
 295  fail:
 296         TALLOC_FREE(smb_fname_hash);
 297         TALLOC_FREE(result);
 298         return NULL;
 299 }
 300 /**
 301  * Given a stream name, populate smb_fname_out with the actual location of the
 302  * stream.
 303  */
 304 static NTSTATUS stream_smb_fname(vfs_handle_struct *handle,
 305                                  const struct smb_filename *smb_fname,
 306                                  struct smb_filename **smb_fname_out,
 307                                  bool create_dir)
 308 {
 309         char *dirname, *stream_fname;
 310         const char *stype;
 311         NTSTATUS status;
 312
 313         *smb_fname_out = NULL;
 314
 315         stype = strchr_m(smb_fname->stream_name + 1, ':');
 316
 317         if (stype) {
 318                 if (strcasecmp_m(stype, ":$DATA") != 0) {
 319                         return NT_STATUS_INVALID_PARAMETER;
 320                 }
 321         }
 322
 323         dirname = stream_dir(handle, smb_fname, NULL, create_dir);
 324
 325         if (dirname == NULL) {
 326                 status = map_nt_error_from_unix(errno);
 327                 goto fail;
 328         }
 329
 330         stream_fname = talloc_asprintf(talloc_tos(), "%s/%s", dirname,
 331                                        smb_fname->stream_name);
 332
 333         if (stream_fname == NULL) {
 334                 status = NT_STATUS_NO_MEMORY;
 335                 goto fail;
 336         }
 337
 338         if (stype == NULL) {
 339                 /* Append an explicit stream type if one wasn't specified. */
 340                 stream_fname = talloc_asprintf(talloc_tos(), "%s:$DATA",
 341                                                stream_fname);
 342                 if (stream_fname == NULL) {
 343                         status = NT_STATUS_NO_MEMORY;
 344                         goto fail;
 345                 }
 346         } else {
 347                 /* Normalize the stream type to upercase. */
 348                 strupper_m(strrchr_m(stream_fname, ':') + 1);
 349         }
 350
 351         DEBUG(10, ("stream filename = %s\n", stream_fname));
 352
 353         /* Create an smb_filename with stream_name == NULL. */
 354         status = create_synthetic_smb_fname(talloc_tos(), stream_fname, NULL,
 355                                             NULL, smb_fname_out);
 356         if (!NT_STATUS_IS_OK(status)) {
 357                 return status;
 358         }
 359
 360         return NT_STATUS_OK;
 361
 362  fail:
 363         DEBUG(5, ("stream_name failed: %s\n", strerror(errno)));
 364         TALLOC_FREE(*smb_fname_out);
 365         return status;
 366 }
 367
 368 static NTSTATUS walk_streams(vfs_handle_struct *handle,
 369                              struct smb_filename *smb_fname_base,
 370                              char **pdirname,
 371                              bool (*fn)(const char *dirname,
 372                                         const char *dirent,
 373                                         void *private_data),
 374                              void *private_data)
 375 {
 376         char *dirname;
 377         SMB_STRUCT_DIR *dirhandle = NULL;
 378         const char *dirent = NULL;
 379         char *talloced = NULL;
 380
 381         dirname = stream_dir(handle, smb_fname_base, &smb_fname_base->st,
 382                              false);
 383
 384         if (dirname == NULL) {
 385                 if (errno == ENOENT) {
 386                         /*
 387                          * no stream around
 388                          */
 389                         return NT_STATUS_OK;
 390                 }
 391                 return map_nt_error_from_unix(errno);
 392         }
 393
 394         DEBUG(10, ("walk_streams: dirname=%s\n", dirname));
 395
 396         dirhandle = SMB_VFS_NEXT_OPENDIR(handle, dirname, NULL, 0);
 397
 398         if (dirhandle == NULL) {
 399                 TALLOC_FREE(dirname);
 400                 return map_nt_error_from_unix(errno);
 401         }
 402
 403         while ((dirent = vfs_readdirname(handle->conn, dirhandle, NULL,
 404                                          &talloced)) != NULL) {
 405
 406                 if (ISDOT(dirent) || ISDOTDOT(dirent)) {
 407                         TALLOC_FREE(talloced);
 408                         continue;
 409                 }
 410
 411                 DEBUG(10, ("walk_streams: dirent=%s\n", dirent));
 412
 413                 if (!fn(dirname, dirent, private_data)) {
 414                         TALLOC_FREE(talloced);
 415                         break;
 416                 }
 417                 TALLOC_FREE(talloced);
 418         }
 419
 420         SMB_VFS_NEXT_CLOSEDIR(handle, dirhandle);
 421
 422         if (pdirname != NULL) {
 423                 *pdirname = dirname;
 424         }
 425         else {
 426                 TALLOC_FREE(dirname);
 427         }
 428
 429         return NT_STATUS_OK;
 430 }
 431
 432 /**
 433  * Helper to stat/lstat the base file of an smb_fname. This will actually
 434  * fills in the stat struct in smb_filename.
 435  */
 436 static int streams_depot_stat_base(vfs_handle_struct *handle,
 437                                    struct smb_filename *smb_fname,
 438                                    bool follow_links)
 439 {
 440         char *tmp_stream_name;
 441         int result;
 442
 443         tmp_stream_name = smb_fname->stream_name;
 444         smb_fname->stream_name = NULL;
 445         if (follow_links) {
 446                 result = SMB_VFS_NEXT_STAT(handle, smb_fname);
 447         } else {
 448                 result = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 449         }
 450         smb_fname->stream_name = tmp_stream_name;
 451         return result;
 452 }
 453
 454 static int streams_depot_stat(vfs_handle_struct *handle,
 455                               struct smb_filename *smb_fname)
 456 {
 457         struct smb_filename *smb_fname_stream = NULL;
 458         NTSTATUS status;
 459         int ret = -1;
 460
 461         DEBUG(10, ("streams_depot_stat called for [%s]\n",
 462                    smb_fname_str_dbg(smb_fname)));
 463
 464         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 465                 return SMB_VFS_NEXT_STAT(handle, smb_fname);
 466         }
 467
 468         /* If the default stream is requested, just stat the base file. */
 469         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 470                 return streams_depot_stat_base(handle, smb_fname, true);
 471         }
 472
 473         /* Stat the actual stream now. */
 474         status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
 475                                   false);
 476         if (!NT_STATUS_IS_OK(status)) {
 477                 ret = -1;
 478                 errno = map_errno_from_nt_status(status);
 479                 goto done;
 480         }
 481
 482         ret = SMB_VFS_NEXT_STAT(handle, smb_fname_stream);
 483
 484         /* Update the original smb_fname with the stat info. */
 485         smb_fname->st = smb_fname_stream->st;
 486  done:
 487         TALLOC_FREE(smb_fname_stream);
 488         return ret;
 489 }
 490
 491
 492
 493 static int streams_depot_lstat(vfs_handle_struct *handle,
 494                                struct smb_filename *smb_fname)
 495 {
 496         struct smb_filename *smb_fname_stream = NULL;
 497         NTSTATUS status;
 498         int ret = -1;
 499
 500         DEBUG(10, ("streams_depot_lstat called for [%s]\n",
 501                    smb_fname_str_dbg(smb_fname)));
 502
 503         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 504                 return SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 505         }
 506
 507         /* If the default stream is requested, just stat the base file. */
 508         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 509                 return streams_depot_stat_base(handle, smb_fname, false);
 510         }
 511
 512         /* Stat the actual stream now. */
 513         status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
 514                                   false);
 515         if (!NT_STATUS_IS_OK(status)) {
 516                 ret = -1;
 517                 errno = map_errno_from_nt_status(status);
 518                 goto done;
 519         }
 520
 521         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_stream);
 522
 523  done:
 524         TALLOC_FREE(smb_fname_stream);
 525         return ret;
 526 }
 527
 528 static int streams_depot_open(vfs_handle_struct *handle,
 529                               struct smb_filename *smb_fname,
 530                               files_struct *fsp, int flags, mode_t mode)
 531 {
 532         struct smb_filename *smb_fname_stream = NULL;
 533         struct smb_filename *smb_fname_base = NULL;
 534         NTSTATUS status;
 535         int ret = -1;
 536
 537         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 538                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 539         }
 540
 541         /* If the default stream is requested, just open the base file. */
 542         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 543                 char *tmp_stream_name;
 544
 545                 tmp_stream_name = smb_fname->stream_name;
 546                 smb_fname->stream_name = NULL;
 547                 ret = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 548                 smb_fname->stream_name = tmp_stream_name;
 549
 550                 return ret;
 551         }
 552
 553         /* Ensure the base file still exists. */
 554         status = create_synthetic_smb_fname(talloc_tos(),
 555                                             smb_fname->base_name,
 556                                             NULL, NULL,
 557                                             &smb_fname_base);
 558         if (!NT_STATUS_IS_OK(status)) {
 559                 ret = -1;
 560                 errno = map_errno_from_nt_status(status);
 561                 goto done;
 562         }
 563
 564         ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 565         if (ret == -1) {
 566                 goto done;
 567         }
 568
 569         /* Determine the stream name, and then open it. */
 570         status = stream_smb_fname(handle, smb_fname, &smb_fname_stream, true);
 571         if (!NT_STATUS_IS_OK(status)) {
 572                 ret = -1;
 573                 errno = map_errno_from_nt_status(status);
 574                 goto done;
 575         }
 576
 577         ret = SMB_VFS_NEXT_OPEN(handle, smb_fname_stream, fsp, flags, mode);
 578
 579  done:
 580         TALLOC_FREE(smb_fname_stream);
 581         TALLOC_FREE(smb_fname_base);
 582         return ret;
 583 }
 584
 585 static int streams_depot_unlink(vfs_handle_struct *handle,
 586                                 const struct smb_filename *smb_fname)
 587 {
 588         struct smb_filename *smb_fname_base = NULL;
 589         NTSTATUS status;
 590         int ret = -1;
 591
 592         DEBUG(10, ("streams_depot_unlink called for %s\n",
 593                    smb_fname_str_dbg(smb_fname)));
 594
 595         /* If there is a valid stream, just unlink the stream and return. */
 596         if (is_ntfs_stream_smb_fname(smb_fname) &&
 597             !is_ntfs_default_stream_smb_fname(smb_fname)) {
 598                 struct smb_filename *smb_fname_stream = NULL;
 599
 600                 status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
 601                                           false);
 602                 if (!NT_STATUS_IS_OK(status)) {
 603                         errno = map_errno_from_nt_status(status);
 604                         return -1;
 605                 }
 606
 607                 ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname_stream);
 608
 609                 TALLOC_FREE(smb_fname_stream);
 610                 return ret;
 611         }
 612
 613         /*
 614          * We potentially need to delete the per-inode streams directory
 615          */
 616
 617         status = create_synthetic_smb_fname(talloc_tos(), smb_fname->base_name,
 618                                             NULL, NULL, &smb_fname_base);
 619         if (!NT_STATUS_IS_OK(status)) {
 620                 errno = map_errno_from_nt_status(status);
 621                 return -1;
 622         }
 623
 624         if (lp_posix_pathnames()) {
 625                 ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_base);
 626         } else {
 627                 ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 628         }
 629
 630         if (ret == -1) {
 631                 TALLOC_FREE(smb_fname_base);
 632                 return -1;
 633         }
 634
 635         if (smb_fname_base->st.st_ex_nlink == 1) {
 636                 char *dirname = stream_dir(handle, smb_fname_base,
 637                                            &smb_fname_base->st, false);
 638
 639                 if (dirname != NULL) {
 640                         SMB_VFS_NEXT_RMDIR(handle, dirname);
 641                 }
 642                 TALLOC_FREE(dirname);
 643         }
 644
 645         ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname);
 646
 647         TALLOC_FREE(smb_fname_base);
 648         return ret;
 649 }
 650
 651 static int streams_depot_rmdir(vfs_handle_struct *handle, const char *path)
 652 {
 653         struct smb_filename *smb_fname_base = NULL;
 654         NTSTATUS status;
 655         int ret = -1;
 656
 657         DEBUG(10, ("streams_depot_rmdir called for %s\n", path));
 658
 659         /*
 660          * We potentially need to delete the per-inode streams directory
 661          */
 662
 663         status = create_synthetic_smb_fname(talloc_tos(), path,
 664                                             NULL, NULL, &smb_fname_base);
 665         if (!NT_STATUS_IS_OK(status)) {
 666                 errno = map_errno_from_nt_status(status);
 667                 return -1;
 668         }
 669
 670         if (lp_posix_pathnames()) {
 671                 ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_base);
 672         } else {
 673                 ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 674         }
 675
 676         if (ret == -1) {
 677                 TALLOC_FREE(smb_fname_base);
 678                 return -1;
 679         }
 680
 681         if (smb_fname_base->st.st_ex_nlink == 2) {
 682                 char *dirname = stream_dir(handle, smb_fname_base,
 683                                            &smb_fname_base->st, false);
 684
 685                 if (dirname != NULL) {
 686                         SMB_VFS_NEXT_RMDIR(handle, dirname);
 687                 }
 688                 TALLOC_FREE(dirname);
 689         }
 690
 691         ret = SMB_VFS_NEXT_RMDIR(handle, path);
 692
 693         TALLOC_FREE(smb_fname_base);
 694         return ret;
 695 }
 696
 697 static int streams_depot_rename(vfs_handle_struct *handle,
 698                                 const struct smb_filename *smb_fname_src,
 699                                 const struct smb_filename *smb_fname_dst)
 700 {
 701         struct smb_filename *smb_fname_src_stream = NULL;
 702         struct smb_filename *smb_fname_dst_stream = NULL;
 703         bool src_is_stream, dst_is_stream;
 704         NTSTATUS status;
 705         int ret = -1;
 706
 707         DEBUG(10, ("streams_depot_rename called for %s => %s\n",
 708                    smb_fname_str_dbg(smb_fname_src),
 709                    smb_fname_str_dbg(smb_fname_dst)));
 710
 711         src_is_stream = is_ntfs_stream_smb_fname(smb_fname_src);
 712         dst_is_stream = is_ntfs_stream_smb_fname(smb_fname_dst);
 713
 714         if (!src_is_stream && !dst_is_stream) {
 715                 return SMB_VFS_NEXT_RENAME(handle, smb_fname_src,
 716                                            smb_fname_dst);
 717         }
 718
 719         /* for now don't allow renames from or to the default stream */
 720         if (is_ntfs_default_stream_smb_fname(smb_fname_src) ||
 721             is_ntfs_default_stream_smb_fname(smb_fname_dst)) {
 722                 errno = ENOSYS;
 723                 goto done;
 724         }
 725
 726         status = stream_smb_fname(handle, smb_fname_src, &smb_fname_src_stream,
 727                                   false);
 728         if (!NT_STATUS_IS_OK(status)) {
 729                 errno = map_errno_from_nt_status(status);
 730                 goto done;
 731         }
 732
 733         status = stream_smb_fname(handle, smb_fname_dst,
 734                                   &smb_fname_dst_stream, false);
 735         if (!NT_STATUS_IS_OK(status)) {
 736                 errno = map_errno_from_nt_status(status);
 737                 goto done;
 738         }
 739
 740         ret = SMB_VFS_NEXT_RENAME(handle, smb_fname_src_stream,
 741                                   smb_fname_dst_stream);
 742
 743 done:
 744         TALLOC_FREE(smb_fname_src_stream);
 745         TALLOC_FREE(smb_fname_dst_stream);
 746         return ret;
 747 }
 748
 749 static bool add_one_stream(TALLOC_CTX *mem_ctx, unsigned int *num_streams,
 750                            struct stream_struct **streams,
 751                            const char *name, SMB_OFF_T size,
 752                            SMB_OFF_T alloc_size)
 753 {
 754         struct stream_struct *tmp;
 755
 756         tmp = talloc_realloc(mem_ctx, *streams, struct stream_struct,
 757                                    (*num_streams)+1);
 758         if (tmp == NULL) {
 759                 return false;
 760         }
 761
 762         tmp[*num_streams].name = talloc_strdup(tmp, name);
 763         if (tmp[*num_streams].name == NULL) {
 764                 return false;
 765         }
 766
 767         tmp[*num_streams].size = size;
 768         tmp[*num_streams].alloc_size = alloc_size;
 769
 770         *streams = tmp;
 771         *num_streams += 1;
 772         return true;
 773 }
 774
 775 struct streaminfo_state {
 776         TALLOC_CTX *mem_ctx;
 777         vfs_handle_struct *handle;
 778         unsigned int num_streams;
 779         struct stream_struct *streams;
 780         NTSTATUS status;
 781 };
 782
 783 static bool collect_one_stream(const char *dirname,
 784                                const char *dirent,
 785                                void *private_data)
 786 {
 787         struct streaminfo_state *state =
 788                 (struct streaminfo_state *)private_data;
 789         struct smb_filename *smb_fname = NULL;
 790         char *sname = NULL;
 791         NTSTATUS status;
 792         bool ret;
 793
 794         sname = talloc_asprintf(talloc_tos(), "%s/%s", dirname, dirent);
 795         if (sname == NULL) {
 796                 state->status = NT_STATUS_NO_MEMORY;
 797                 ret = false;
 798                 goto out;
 799         }
 800
 801         status = create_synthetic_smb_fname(talloc_tos(), sname, NULL,
 802                                             NULL, &smb_fname);
 803         if (!NT_STATUS_IS_OK(status)) {
 804                 state->status = status;
 805                 ret = false;
 806                 goto out;
 807         }
 808
 809         if (SMB_VFS_NEXT_STAT(state->handle, smb_fname) == -1) {
 810                 DEBUG(10, ("Could not stat %s: %s\n", sname,
 811                            strerror(errno)));
 812                 ret = true;
 813                 goto out;
 814         }
 815
 816         if (!add_one_stream(state->mem_ctx,
 817                             &state->num_streams, &state->streams,
 818                             dirent, smb_fname->st.st_ex_size,
 819                             SMB_VFS_GET_ALLOC_SIZE(state->handle->conn, NULL,
 820                                                    &smb_fname->st))) {
 821                 state->status = NT_STATUS_NO_MEMORY;
 822                 ret = false;
 823                 goto out;
 824         }
 825
 826         ret = true;
 827  out:
 828         TALLOC_FREE(sname);
 829         TALLOC_FREE(smb_fname);
 830         return ret;
 831 }
 832
 833 static NTSTATUS streams_depot_streaminfo(vfs_handle_struct *handle,
 834                                          struct files_struct *fsp,
 835                                          const char *fname,
 836                                          TALLOC_CTX *mem_ctx,
 837                                          unsigned int *pnum_streams,
 838                                          struct stream_struct **pstreams)
 839 {
 840         struct smb_filename *smb_fname_base = NULL;
 841         int ret;
 842         NTSTATUS status;
 843         struct streaminfo_state state;
 844
 845         status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
 846                                             &smb_fname_base);
 847         if (!NT_STATUS_IS_OK(status)) {
 848                 return status;
 849         }
 850
 851         if ((fsp != NULL) && (fsp->fh->fd != -1)) {
 852                 ret = SMB_VFS_NEXT_FSTAT(handle, fsp, &smb_fname_base->st);
 853         }
 854         else {
 855                 if (lp_posix_pathnames()) {
 856                         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_base);
 857                 } else {
 858                         ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 859                 }
 860         }
 861
 862         if (ret == -1) {
 863                 status = map_nt_error_from_unix(errno);
 864                 goto out;
 865         }
 866
 867         state.streams = *pstreams;
 868         state.num_streams = *pnum_streams;
 869         state.mem_ctx = mem_ctx;
 870         state.handle = handle;
 871         state.status = NT_STATUS_OK;
 872
 873         status = walk_streams(handle, smb_fname_base, NULL, collect_one_stream,
 874                               &state);
 875
 876         if (!NT_STATUS_IS_OK(status)) {
 877                 TALLOC_FREE(state.streams);
 878                 goto out;
 879         }
 880
 881         if (!NT_STATUS_IS_OK(state.status)) {
 882                 TALLOC_FREE(state.streams);
 883                 status = state.status;
 884                 goto out;
 885         }
 886
 887         *pnum_streams = state.num_streams;
 888         *pstreams = state.streams;
 889         status = SMB_VFS_NEXT_STREAMINFO(handle, fsp, fname, mem_ctx, pnum_streams, pstreams);
 890
 891  out:
 892         TALLOC_FREE(smb_fname_base);
 893         return status;
 894 }
 895
 896 static uint32_t streams_depot_fs_capabilities(struct vfs_handle_struct *handle,
 897                         enum timestamp_set_resolution *p_ts_res)
 898 {
 899         return SMB_VFS_NEXT_FS_CAPABILITIES(handle, p_ts_res) | FILE_NAMED_STREAMS;
 900 }
 901
 902 static struct vfs_fn_pointers vfs_streams_depot_fns = {
 903         .fs_capabilities_fn = streams_depot_fs_capabilities,
 904         .open_fn = streams_depot_open,
 905         .stat_fn = streams_depot_stat,
 906         .lstat_fn = streams_depot_lstat,
 907         .unlink_fn = streams_depot_unlink,
 908         .rmdir_fn = streams_depot_rmdir,
 909         .rename_fn = streams_depot_rename,
 910         .streaminfo_fn = streams_depot_streaminfo,
 911 };
 912
 913 NTSTATUS vfs_streams_depot_init(void);
 914 NTSTATUS vfs_streams_depot_init(void)
 915 {
 916         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "streams_depot",
 917                                 &vfs_streams_depot_fns);
 918 }