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                           bool check_valid)
  72 {
  73         char buf;
  74
  75         if (!check_valid) {
  76                 return true;
  77         }
  78
  79         DEBUG(10, ("file_is_valid (%s) called\n", path));
  80
  81         if (SMB_VFS_GETXATTR(handle->conn, path, SAMBA_XATTR_MARKER,
  82                                   &buf, sizeof(buf)) != sizeof(buf)) {
  83                 DEBUG(10, ("GETXATTR failed: %s\n", strerror(errno)));
  84                 return false;
  85         }
  86
  87         if (buf != '1') {
  88                 DEBUG(10, ("got wrong buffer content: '%c'\n", buf));
  89                 return false;
  90         }
  91
  92         return true;
  93 }
  94
  95 static bool mark_file_valid(vfs_handle_struct *handle, const char *path,
  96                             bool check_valid)
  97 {
  98         char buf = '1';
  99         int ret;
 100
 101         if (!check_valid) {
 102                 return true;
 103         }
 104
 105         DEBUG(10, ("marking file %s as valid\n", path));
 106
 107         ret = SMB_VFS_SETXATTR(handle->conn, path, SAMBA_XATTR_MARKER,
 108                                     &buf, sizeof(buf), 0);
 109
 110         if (ret == -1) {
 111                 DEBUG(10, ("SETXATTR failed: %s\n", strerror(errno)));
 112                 return false;
 113         }
 114
 115         return true;
 116 }
 117
 118 /**
 119  * Given an smb_filename, determine the stream directory using the file's
 120  * base_name.
 121  */
 122 static char *stream_dir(vfs_handle_struct *handle,
 123                         const struct smb_filename *smb_fname,
 124                         const SMB_STRUCT_STAT *base_sbuf, bool create_it)
 125 {
 126         uint32_t hash;
 127         struct smb_filename *smb_fname_hash = NULL;
 128         char *result = NULL;
 129         SMB_STRUCT_STAT base_sbuf_tmp;
 130         uint8_t first, second;
 131         char *tmp;
 132         char *id_hex;
 133         struct file_id id;
 134         uint8 id_buf[16];
 135         bool check_valid;
 136         const char *rootdir;
 137         NTSTATUS status;
 138
 139         check_valid = lp_parm_bool(SNUM(handle->conn),
 140                       "streams_depot", "check_valid", true);
 141
 142         tmp = talloc_asprintf(talloc_tos(), "%s/.streams", handle->conn->connectpath);
 143
 144         if (tmp == NULL) {
 145                 errno = ENOMEM;
 146                 goto fail;
 147         }
 148
 149         rootdir = lp_parm_const_string(
 150                 SNUM(handle->conn), "streams_depot", "directory",
 151                 tmp);
 152
 153         /* Stat the base file if it hasn't already been done. */
 154         if (base_sbuf == NULL) {
 155                 struct smb_filename *smb_fname_base = NULL;
 156
 157                 status = create_synthetic_smb_fname(talloc_tos(),
 158                                                     smb_fname->base_name,
 159                                                     NULL, NULL,
 160                                                     &smb_fname_base);
 161                 if (!NT_STATUS_IS_OK(status)) {
 162                         errno = map_errno_from_nt_status(status);
 163                         goto fail;
 164                 }
 165                 if (SMB_VFS_NEXT_STAT(handle, smb_fname_base) == -1) {
 166                         TALLOC_FREE(smb_fname_base);
 167                         goto fail;
 168                 }
 169                 base_sbuf_tmp = smb_fname_base->st;
 170                 TALLOC_FREE(smb_fname_base);
 171         } else {
 172                 base_sbuf_tmp = *base_sbuf;
 173         }
 174
 175         id = SMB_VFS_FILE_ID_CREATE(handle->conn, &base_sbuf_tmp);
 176
 177         push_file_id_16((char *)id_buf, &id);
 178
 179         hash = hash_fn(data_blob_const(id_buf, sizeof(id_buf)));
 180
 181         first = hash & 0xff;
 182         second = (hash >> 8) & 0xff;
 183
 184         id_hex = hex_encode_talloc(talloc_tos(), id_buf, sizeof(id_buf));
 185
 186         if (id_hex == NULL) {
 187                 errno = ENOMEM;
 188                 goto fail;
 189         }
 190
 191         result = talloc_asprintf(talloc_tos(), "%s/%2.2X/%2.2X/%s", rootdir,
 192                                  first, second, id_hex);
 193
 194         TALLOC_FREE(id_hex);
 195
 196         if (result == NULL) {
 197                 errno = ENOMEM;
 198                 return NULL;
 199         }
 200
 201         status = create_synthetic_smb_fname(talloc_tos(), result, NULL, NULL,
 202                                             &smb_fname_hash);
 203         if (!NT_STATUS_IS_OK(status)) {
 204                 errno = map_errno_from_nt_status(status);
 205                 goto fail;
 206         }
 207
 208         if (SMB_VFS_NEXT_STAT(handle, smb_fname_hash) == 0) {
 209                 struct smb_filename *smb_fname_new = NULL;
 210                 char *newname;
 211
 212                 if (!S_ISDIR(smb_fname_hash->st.st_ex_mode)) {
 213                         errno = EINVAL;
 214                         goto fail;
 215                 }
 216
 217                 if (file_is_valid(handle, smb_fname->base_name, check_valid)) {
 218                         return result;
 219                 }
 220
 221                 /*
 222                  * Someone has recreated a file under an existing inode
 223                  * without deleting the streams directory. For now, just move
 224                  * it away.
 225                  */
 226
 227         again:
 228                 newname = talloc_asprintf(talloc_tos(), "lost-%lu", random());
 229                 if (newname == NULL) {
 230                         errno = ENOMEM;
 231                         goto fail;
 232                 }
 233
 234                 status = create_synthetic_smb_fname(talloc_tos(), newname,
 235                                                     NULL, NULL,
 236                                                     &smb_fname_new);
 237                 TALLOC_FREE(newname);
 238                 if (!NT_STATUS_IS_OK(status)) {
 239                         errno = map_errno_from_nt_status(status);
 240                         goto fail;
 241                 }
 242
 243                 if (SMB_VFS_NEXT_RENAME(handle, smb_fname_hash,
 244                                         smb_fname_new) == -1) {
 245                         TALLOC_FREE(smb_fname_new);
 246                         if ((errno == EEXIST) || (errno == ENOTEMPTY)) {
 247                                 goto again;
 248                         }
 249                         goto fail;
 250                 }
 251
 252                 TALLOC_FREE(smb_fname_new);
 253         }
 254
 255         if (!create_it) {
 256                 errno = ENOENT;
 257                 goto fail;
 258         }
 259
 260         if ((SMB_VFS_NEXT_MKDIR(handle, rootdir, 0755) != 0)
 261             && (errno != EEXIST)) {
 262                 goto fail;
 263         }
 264
 265         tmp = talloc_asprintf(result, "%s/%2.2X", rootdir, first);
 266         if (tmp == NULL) {
 267                 errno = ENOMEM;
 268                 goto fail;
 269         }
 270
 271         if ((SMB_VFS_NEXT_MKDIR(handle, tmp, 0755) != 0)
 272             && (errno != EEXIST)) {
 273                 goto fail;
 274         }
 275
 276         TALLOC_FREE(tmp);
 277
 278         tmp = talloc_asprintf(result, "%s/%2.2X/%2.2X", rootdir, first,
 279                               second);
 280         if (tmp == NULL) {
 281                 errno = ENOMEM;
 282                 goto fail;
 283         }
 284
 285         if ((SMB_VFS_NEXT_MKDIR(handle, tmp, 0755) != 0)
 286             && (errno != EEXIST)) {
 287                 goto fail;
 288         }
 289
 290         TALLOC_FREE(tmp);
 291
 292         if ((SMB_VFS_NEXT_MKDIR(handle, result, 0755) != 0)
 293             && (errno != EEXIST)) {
 294                 goto fail;
 295         }
 296
 297         if (!mark_file_valid(handle, smb_fname->base_name, check_valid)) {
 298                 goto fail;
 299         }
 300
 301         TALLOC_FREE(smb_fname_hash);
 302         return result;
 303
 304  fail:
 305         TALLOC_FREE(smb_fname_hash);
 306         TALLOC_FREE(result);
 307         return NULL;
 308 }
 309 /**
 310  * Given a stream name, populate smb_fname_out with the actual location of the
 311  * stream.
 312  */
 313 static NTSTATUS stream_smb_fname(vfs_handle_struct *handle,
 314                                  const struct smb_filename *smb_fname,
 315                                  struct smb_filename **smb_fname_out,
 316                                  bool create_dir)
 317 {
 318         char *dirname, *stream_fname;
 319         const char *stype;
 320         NTSTATUS status;
 321
 322         *smb_fname_out = NULL;
 323
 324         stype = strchr_m(smb_fname->stream_name + 1, ':');
 325
 326         if (stype) {
 327                 if (strcasecmp_m(stype, ":$DATA") != 0) {
 328                         return NT_STATUS_INVALID_PARAMETER;
 329                 }
 330         }
 331
 332         dirname = stream_dir(handle, smb_fname, NULL, create_dir);
 333
 334         if (dirname == NULL) {
 335                 status = map_nt_error_from_unix(errno);
 336                 goto fail;
 337         }
 338
 339         stream_fname = talloc_asprintf(talloc_tos(), "%s/%s", dirname,
 340                                        smb_fname->stream_name);
 341
 342         if (stream_fname == NULL) {
 343                 status = NT_STATUS_NO_MEMORY;
 344                 goto fail;
 345         }
 346
 347         if (stype == NULL) {
 348                 /* Append an explicit stream type if one wasn't specified. */
 349                 stream_fname = talloc_asprintf(talloc_tos(), "%s:$DATA",
 350                                                stream_fname);
 351                 if (stream_fname == NULL) {
 352                         status = NT_STATUS_NO_MEMORY;
 353                         goto fail;
 354                 }
 355         } else {
 356                 /* Normalize the stream type to upercase. */
 357                 strupper_m(strrchr_m(stream_fname, ':') + 1);
 358         }
 359
 360         DEBUG(10, ("stream filename = %s\n", stream_fname));
 361
 362         /* Create an smb_filename with stream_name == NULL. */
 363         status = create_synthetic_smb_fname(talloc_tos(), stream_fname, NULL,
 364                                             NULL, smb_fname_out);
 365         if (!NT_STATUS_IS_OK(status)) {
 366                 return status;
 367         }
 368
 369         return NT_STATUS_OK;
 370
 371  fail:
 372         DEBUG(5, ("stream_name failed: %s\n", strerror(errno)));
 373         TALLOC_FREE(*smb_fname_out);
 374         return status;
 375 }
 376
 377 static NTSTATUS walk_streams(vfs_handle_struct *handle,
 378                              struct smb_filename *smb_fname_base,
 379                              char **pdirname,
 380                              bool (*fn)(const char *dirname,
 381                                         const char *dirent,
 382                                         void *private_data),
 383                              void *private_data)
 384 {
 385         char *dirname;
 386         SMB_STRUCT_DIR *dirhandle = NULL;
 387         const char *dirent = NULL;
 388         char *talloced = NULL;
 389
 390         dirname = stream_dir(handle, smb_fname_base, &smb_fname_base->st,
 391                              false);
 392
 393         if (dirname == NULL) {
 394                 if (errno == ENOENT) {
 395                         /*
 396                          * no stream around
 397                          */
 398                         return NT_STATUS_OK;
 399                 }
 400                 return map_nt_error_from_unix(errno);
 401         }
 402
 403         DEBUG(10, ("walk_streams: dirname=%s\n", dirname));
 404
 405         dirhandle = SMB_VFS_NEXT_OPENDIR(handle, dirname, NULL, 0);
 406
 407         if (dirhandle == NULL) {
 408                 TALLOC_FREE(dirname);
 409                 return map_nt_error_from_unix(errno);
 410         }
 411
 412         while ((dirent = vfs_readdirname(handle->conn, dirhandle, NULL,
 413                                          &talloced)) != NULL) {
 414
 415                 if (ISDOT(dirent) || ISDOTDOT(dirent)) {
 416                         TALLOC_FREE(talloced);
 417                         continue;
 418                 }
 419
 420                 DEBUG(10, ("walk_streams: dirent=%s\n", dirent));
 421
 422                 if (!fn(dirname, dirent, private_data)) {
 423                         TALLOC_FREE(talloced);
 424                         break;
 425                 }
 426                 TALLOC_FREE(talloced);
 427         }
 428
 429         SMB_VFS_NEXT_CLOSEDIR(handle, dirhandle);
 430
 431         if (pdirname != NULL) {
 432                 *pdirname = dirname;
 433         }
 434         else {
 435                 TALLOC_FREE(dirname);
 436         }
 437
 438         return NT_STATUS_OK;
 439 }
 440
 441 /**
 442  * Helper to stat/lstat the base file of an smb_fname. This will actually
 443  * fills in the stat struct in smb_filename.
 444  */
 445 static int streams_depot_stat_base(vfs_handle_struct *handle,
 446                                    struct smb_filename *smb_fname,
 447                                    bool follow_links)
 448 {
 449         char *tmp_stream_name;
 450         int result;
 451
 452         tmp_stream_name = smb_fname->stream_name;
 453         smb_fname->stream_name = NULL;
 454         if (follow_links) {
 455                 result = SMB_VFS_NEXT_STAT(handle, smb_fname);
 456         } else {
 457                 result = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 458         }
 459         smb_fname->stream_name = tmp_stream_name;
 460         return result;
 461 }
 462
 463 static int streams_depot_stat(vfs_handle_struct *handle,
 464                               struct smb_filename *smb_fname)
 465 {
 466         struct smb_filename *smb_fname_stream = NULL;
 467         NTSTATUS status;
 468         int ret = -1;
 469
 470         DEBUG(10, ("streams_depot_stat called for [%s]\n",
 471                    smb_fname_str_dbg(smb_fname)));
 472
 473         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 474                 return SMB_VFS_NEXT_STAT(handle, smb_fname);
 475         }
 476
 477         /* If the default stream is requested, just stat the base file. */
 478         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 479                 return streams_depot_stat_base(handle, smb_fname, true);
 480         }
 481
 482         /* Stat the actual stream now. */
 483         status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
 484                                   false);
 485         if (!NT_STATUS_IS_OK(status)) {
 486                 ret = -1;
 487                 errno = map_errno_from_nt_status(status);
 488                 goto done;
 489         }
 490
 491         ret = SMB_VFS_NEXT_STAT(handle, smb_fname_stream);
 492
 493         /* Update the original smb_fname with the stat info. */
 494         smb_fname->st = smb_fname_stream->st;
 495  done:
 496         TALLOC_FREE(smb_fname_stream);
 497         return ret;
 498 }
 499
 500
 501
 502 static int streams_depot_lstat(vfs_handle_struct *handle,
 503                                struct smb_filename *smb_fname)
 504 {
 505         struct smb_filename *smb_fname_stream = NULL;
 506         NTSTATUS status;
 507         int ret = -1;
 508
 509         DEBUG(10, ("streams_depot_lstat called for [%s]\n",
 510                    smb_fname_str_dbg(smb_fname)));
 511
 512         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 513                 return SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 514         }
 515
 516         /* If the default stream is requested, just stat the base file. */
 517         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 518                 return streams_depot_stat_base(handle, smb_fname, false);
 519         }
 520
 521         /* Stat the actual stream now. */
 522         status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
 523                                   false);
 524         if (!NT_STATUS_IS_OK(status)) {
 525                 ret = -1;
 526                 errno = map_errno_from_nt_status(status);
 527                 goto done;
 528         }
 529
 530         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_stream);
 531
 532  done:
 533         TALLOC_FREE(smb_fname_stream);
 534         return ret;
 535 }
 536
 537 static int streams_depot_open(vfs_handle_struct *handle,
 538                               struct smb_filename *smb_fname,
 539                               files_struct *fsp, int flags, mode_t mode)
 540 {
 541         struct smb_filename *smb_fname_stream = NULL;
 542         struct smb_filename *smb_fname_base = NULL;
 543         NTSTATUS status;
 544         int ret = -1;
 545
 546         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 547                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 548         }
 549
 550         /* If the default stream is requested, just open the base file. */
 551         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 552                 char *tmp_stream_name;
 553
 554                 tmp_stream_name = smb_fname->stream_name;
 555                 smb_fname->stream_name = NULL;
 556                 ret = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 557                 smb_fname->stream_name = tmp_stream_name;
 558
 559                 return ret;
 560         }
 561
 562         /* Ensure the base file still exists. */
 563         status = create_synthetic_smb_fname(talloc_tos(),
 564                                             smb_fname->base_name,
 565                                             NULL, NULL,
 566                                             &smb_fname_base);
 567         if (!NT_STATUS_IS_OK(status)) {
 568                 ret = -1;
 569                 errno = map_errno_from_nt_status(status);
 570                 goto done;
 571         }
 572
 573         ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 574         if (ret == -1) {
 575                 goto done;
 576         }
 577
 578         /* Determine the stream name, and then open it. */
 579         status = stream_smb_fname(handle, smb_fname, &smb_fname_stream, true);
 580         if (!NT_STATUS_IS_OK(status)) {
 581                 ret = -1;
 582                 errno = map_errno_from_nt_status(status);
 583                 goto done;
 584         }
 585
 586         ret = SMB_VFS_NEXT_OPEN(handle, smb_fname_stream, fsp, flags, mode);
 587
 588  done:
 589         TALLOC_FREE(smb_fname_stream);
 590         TALLOC_FREE(smb_fname_base);
 591         return ret;
 592 }
 593
 594 static int streams_depot_unlink(vfs_handle_struct *handle,
 595                                 const struct smb_filename *smb_fname)
 596 {
 597         struct smb_filename *smb_fname_base = NULL;
 598         NTSTATUS status;
 599         int ret = -1;
 600
 601         DEBUG(10, ("streams_depot_unlink called for %s\n",
 602                    smb_fname_str_dbg(smb_fname)));
 603
 604         /* If there is a valid stream, just unlink the stream and return. */
 605         if (is_ntfs_stream_smb_fname(smb_fname) &&
 606             !is_ntfs_default_stream_smb_fname(smb_fname)) {
 607                 struct smb_filename *smb_fname_stream = NULL;
 608
 609                 status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
 610                                           false);
 611                 if (!NT_STATUS_IS_OK(status)) {
 612                         errno = map_errno_from_nt_status(status);
 613                         return -1;
 614                 }
 615
 616                 ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname_stream);
 617
 618                 TALLOC_FREE(smb_fname_stream);
 619                 return ret;
 620         }
 621
 622         /*
 623          * We potentially need to delete the per-inode streams directory
 624          */
 625
 626         status = create_synthetic_smb_fname(talloc_tos(), smb_fname->base_name,
 627                                             NULL, NULL, &smb_fname_base);
 628         if (!NT_STATUS_IS_OK(status)) {
 629                 errno = map_errno_from_nt_status(status);
 630                 return -1;
 631         }
 632
 633         if (lp_posix_pathnames()) {
 634                 ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_base);
 635         } else {
 636                 ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 637         }
 638
 639         if (ret == -1) {
 640                 TALLOC_FREE(smb_fname_base);
 641                 return -1;
 642         }
 643
 644         if (smb_fname_base->st.st_ex_nlink == 1) {
 645                 char *dirname = stream_dir(handle, smb_fname_base,
 646                                            &smb_fname_base->st, false);
 647
 648                 if (dirname != NULL) {
 649                         SMB_VFS_NEXT_RMDIR(handle, dirname);
 650                 }
 651                 TALLOC_FREE(dirname);
 652         }
 653
 654         ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname);
 655
 656         TALLOC_FREE(smb_fname_base);
 657         return ret;
 658 }
 659
 660 static int streams_depot_rename(vfs_handle_struct *handle,
 661                                 const struct smb_filename *smb_fname_src,
 662                                 const struct smb_filename *smb_fname_dst)
 663 {
 664         struct smb_filename *smb_fname_src_stream = NULL;
 665         struct smb_filename *smb_fname_dst_stream = NULL;
 666         bool src_is_stream, dst_is_stream;
 667         NTSTATUS status;
 668         int ret = -1;
 669
 670         DEBUG(10, ("streams_depot_rename called for %s => %s\n",
 671                    smb_fname_str_dbg(smb_fname_src),
 672                    smb_fname_str_dbg(smb_fname_dst)));
 673
 674         src_is_stream = is_ntfs_stream_smb_fname(smb_fname_src);
 675         dst_is_stream = is_ntfs_stream_smb_fname(smb_fname_dst);
 676
 677         if (!src_is_stream && !dst_is_stream) {
 678                 return SMB_VFS_NEXT_RENAME(handle, smb_fname_src,
 679                                            smb_fname_dst);
 680         }
 681
 682         /* for now don't allow renames from or to the default stream */
 683         if (is_ntfs_default_stream_smb_fname(smb_fname_src) ||
 684             is_ntfs_default_stream_smb_fname(smb_fname_dst)) {
 685                 errno = ENOSYS;
 686                 goto done;
 687         }
 688
 689         status = stream_smb_fname(handle, smb_fname_src, &smb_fname_src_stream,
 690                                   false);
 691         if (!NT_STATUS_IS_OK(status)) {
 692                 errno = map_errno_from_nt_status(status);
 693                 goto done;
 694         }
 695
 696         status = stream_smb_fname(handle, smb_fname_dst,
 697                                   &smb_fname_dst_stream, false);
 698         if (!NT_STATUS_IS_OK(status)) {
 699                 errno = map_errno_from_nt_status(status);
 700                 goto done;
 701         }
 702
 703         ret = SMB_VFS_NEXT_RENAME(handle, smb_fname_src_stream,
 704                                   smb_fname_dst_stream);
 705
 706 done:
 707         TALLOC_FREE(smb_fname_src_stream);
 708         TALLOC_FREE(smb_fname_dst_stream);
 709         return ret;
 710 }
 711
 712 static bool add_one_stream(TALLOC_CTX *mem_ctx, unsigned int *num_streams,
 713                            struct stream_struct **streams,
 714                            const char *name, SMB_OFF_T size,
 715                            SMB_OFF_T alloc_size)
 716 {
 717         struct stream_struct *tmp;
 718
 719         tmp = talloc_realloc(mem_ctx, *streams, struct stream_struct,
 720                                    (*num_streams)+1);
 721         if (tmp == NULL) {
 722                 return false;
 723         }
 724
 725         tmp[*num_streams].name = talloc_strdup(tmp, name);
 726         if (tmp[*num_streams].name == NULL) {
 727                 return false;
 728         }
 729
 730         tmp[*num_streams].size = size;
 731         tmp[*num_streams].alloc_size = alloc_size;
 732
 733         *streams = tmp;
 734         *num_streams += 1;
 735         return true;
 736 }
 737
 738 struct streaminfo_state {
 739         TALLOC_CTX *mem_ctx;
 740         vfs_handle_struct *handle;
 741         unsigned int num_streams;
 742         struct stream_struct *streams;
 743         NTSTATUS status;
 744 };
 745
 746 static bool collect_one_stream(const char *dirname,
 747                                const char *dirent,
 748                                void *private_data)
 749 {
 750         struct streaminfo_state *state =
 751                 (struct streaminfo_state *)private_data;
 752         struct smb_filename *smb_fname = NULL;
 753         char *sname = NULL;
 754         NTSTATUS status;
 755         bool ret;
 756
 757         sname = talloc_asprintf(talloc_tos(), "%s/%s", dirname, dirent);
 758         if (sname == NULL) {
 759                 state->status = NT_STATUS_NO_MEMORY;
 760                 ret = false;
 761                 goto out;
 762         }
 763
 764         status = create_synthetic_smb_fname(talloc_tos(), sname, NULL,
 765                                             NULL, &smb_fname);
 766         if (!NT_STATUS_IS_OK(status)) {
 767                 state->status = status;
 768                 ret = false;
 769                 goto out;
 770         }
 771
 772         if (SMB_VFS_NEXT_STAT(state->handle, smb_fname) == -1) {
 773                 DEBUG(10, ("Could not stat %s: %s\n", sname,
 774                            strerror(errno)));
 775                 ret = true;
 776                 goto out;
 777         }
 778
 779         if (!add_one_stream(state->mem_ctx,
 780                             &state->num_streams, &state->streams,
 781                             dirent, smb_fname->st.st_ex_size,
 782                             SMB_VFS_GET_ALLOC_SIZE(state->handle->conn, NULL,
 783                                                    &smb_fname->st))) {
 784                 state->status = NT_STATUS_NO_MEMORY;
 785                 ret = false;
 786                 goto out;
 787         }
 788
 789         ret = true;
 790  out:
 791         TALLOC_FREE(sname);
 792         TALLOC_FREE(smb_fname);
 793         return ret;
 794 }
 795
 796 static NTSTATUS streams_depot_streaminfo(vfs_handle_struct *handle,
 797                                          struct files_struct *fsp,
 798                                          const char *fname,
 799                                          TALLOC_CTX *mem_ctx,
 800                                          unsigned int *pnum_streams,
 801                                          struct stream_struct **pstreams)
 802 {
 803         struct smb_filename *smb_fname_base = NULL;
 804         int ret;
 805         NTSTATUS status;
 806         struct streaminfo_state state;
 807
 808         status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
 809                                             &smb_fname_base);
 810         if (!NT_STATUS_IS_OK(status)) {
 811                 return status;
 812         }
 813
 814         if ((fsp != NULL) && (fsp->fh->fd != -1)) {
 815                 ret = SMB_VFS_NEXT_FSTAT(handle, fsp, &smb_fname_base->st);
 816         }
 817         else {
 818                 if (lp_posix_pathnames()) {
 819                         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_base);
 820                 } else {
 821                         ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 822                 }
 823         }
 824
 825         if (ret == -1) {
 826                 status = map_nt_error_from_unix(errno);
 827                 goto out;
 828         }
 829
 830         state.streams = NULL;
 831         state.num_streams = 0;
 832
 833         if (!S_ISDIR(smb_fname_base->st.st_ex_mode)) {
 834                 if (!add_one_stream(mem_ctx,
 835                                     &state.num_streams, &state.streams,
 836                                     "::$DATA", smb_fname_base->st.st_ex_size,
 837                                     SMB_VFS_GET_ALLOC_SIZE(handle->conn, fsp,
 838                                                        &smb_fname_base->st))) {
 839                         status = NT_STATUS_NO_MEMORY;
 840                         goto out;
 841                 }
 842         }
 843
 844         state.mem_ctx = mem_ctx;
 845         state.handle = handle;
 846         state.status = NT_STATUS_OK;
 847
 848         status = walk_streams(handle, smb_fname_base, NULL, collect_one_stream,
 849                               &state);
 850
 851         if (!NT_STATUS_IS_OK(status)) {
 852                 TALLOC_FREE(state.streams);
 853                 goto out;
 854         }
 855
 856         if (!NT_STATUS_IS_OK(state.status)) {
 857                 TALLOC_FREE(state.streams);
 858                 status = state.status;
 859                 goto out;
 860         }
 861
 862         *pnum_streams = state.num_streams;
 863         *pstreams = state.streams;
 864         status = NT_STATUS_OK;
 865
 866  out:
 867         TALLOC_FREE(smb_fname_base);
 868         return status;
 869 }
 870
 871 static uint32_t streams_depot_fs_capabilities(struct vfs_handle_struct *handle,
 872                         enum timestamp_set_resolution *p_ts_res)
 873 {
 874         return SMB_VFS_NEXT_FS_CAPABILITIES(handle, p_ts_res) | FILE_NAMED_STREAMS;
 875 }
 876
 877 static struct vfs_fn_pointers vfs_streams_depot_fns = {
 878         .fs_capabilities = streams_depot_fs_capabilities,
 879         .open_fn = streams_depot_open,
 880         .stat = streams_depot_stat,
 881         .lstat = streams_depot_lstat,
 882         .unlink = streams_depot_unlink,
 883         .rename = streams_depot_rename,
 884         .streaminfo = streams_depot_streaminfo,
 885 };
 886
 887 NTSTATUS vfs_streams_depot_init(void);
 888 NTSTATUS vfs_streams_depot_init(void)
 889 {
 890         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "streams_depot",
 891                                 &vfs_streams_depot_fns);
 892 }