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
  22 #undef DBGC_CLASS
  23 #define DBGC_CLASS DBGC_VFS
  24
  25 /*
  26  * Excerpt from a mail from tridge:
  27  *
  28  * Volker, what I'm thinking of is this:
  29  * /mount-point/.streams/XX/YY/aaaa.bbbb/namedstream1
  30  * /mount-point/.streams/XX/YY/aaaa.bbbb/namedstream2
  31  *
  32  * where XX/YY is a 2 level hash based on the fsid/inode. "aaaa.bbbb"
  33  * is the fsid/inode. "namedstreamX" is a file named after the stream
  34  * name.
  35  */
  36
  37 static uint32_t hash_fn(DATA_BLOB key)
  38 {
  39         uint32_t value; /* Used to compute the hash value.  */
  40         uint32_t i;     /* Used to cycle through random values. */
  41
  42         /* Set the initial value from the key size. */
  43         for (value = 0x238F13AF * key.length, i=0; i < key.length; i++)
  44                 value = (value + (key.data[i] << (i*5 % 24)));
  45
  46         return (1103515243 * value + 12345);
  47 }
  48
  49 /*
  50  * With the hashing scheme based on the inode we need to protect against
  51  * streams showing up on files with re-used inodes. This can happen if we
  52  * create a stream directory from within Samba, and a local process or NFS
  53  * client deletes the file without deleting the streams directory. When the
  54  * inode is re-used and the stream directory is still around, the streams in
  55  * there would be show up as belonging to the new file.
  56  *
  57  * There are several workarounds for this, probably the easiest one is on
  58  * systems which have a true birthtime stat element: When the file has a later
  59  * birthtime than the streams directory, then we have to recreate the
  60  * directory.
  61  *
  62  * The other workaround is to somehow mark the file as generated by Samba with
  63  * something that a NFS client would not do. The closest one is a special
  64  * xattr value being set. On systems which do not support xattrs, it might be
  65  * an option to put in a special ACL entry for a non-existing group.
  66  */
  67
  68 #define SAMBA_XATTR_MARKER "user.SAMBA_STREAMS"
  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(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         char *dirent = NULL;
 388
 389         dirname = stream_dir(handle, smb_fname_base, &smb_fname_base->st,
 390                              false);
 391
 392         if (dirname == NULL) {
 393                 if (errno == ENOENT) {
 394                         /*
 395                          * no stream around
 396                          */
 397                         return NT_STATUS_OK;
 398                 }
 399                 return map_nt_error_from_unix(errno);
 400         }
 401
 402         DEBUG(10, ("walk_streams: dirname=%s\n", dirname));
 403
 404         dirhandle = SMB_VFS_NEXT_OPENDIR(handle, dirname, NULL, 0);
 405
 406         if (dirhandle == NULL) {
 407                 TALLOC_FREE(dirname);
 408                 return map_nt_error_from_unix(errno);
 409         }
 410
 411         while ((dirent = vfs_readdirname(handle->conn, dirhandle, NULL)) != NULL) {
 412
 413                 if (ISDOT(dirent) || ISDOTDOT(dirent)) {
 414                         TALLOC_FREE(dirent);
 415                         continue;
 416                 }
 417
 418                 DEBUG(10, ("walk_streams: dirent=%s\n", dirent));
 419
 420                 if (!fn(dirname, dirent, private_data)) {
 421                         TALLOC_FREE(dirent);
 422                         break;
 423                 }
 424                 TALLOC_FREE(dirent);
 425         }
 426
 427         SMB_VFS_NEXT_CLOSEDIR(handle, dirhandle);
 428
 429         if (pdirname != NULL) {
 430                 *pdirname = dirname;
 431         }
 432         else {
 433                 TALLOC_FREE(dirname);
 434         }
 435
 436         return NT_STATUS_OK;
 437 }
 438
 439 /**
 440  * Helper to stat/lstat the base file of an smb_fname. This will actually
 441  * fills in the stat struct in smb_filename.
 442  */
 443 static int streams_depot_stat_base(vfs_handle_struct *handle,
 444                                    struct smb_filename *smb_fname,
 445                                    bool follow_links)
 446 {
 447         char *tmp_stream_name;
 448         int result;
 449
 450         tmp_stream_name = smb_fname->stream_name;
 451         smb_fname->stream_name = NULL;
 452         if (follow_links) {
 453                 result = SMB_VFS_NEXT_STAT(handle, smb_fname);
 454         } else {
 455                 result = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 456         }
 457         smb_fname->stream_name = tmp_stream_name;
 458         return result;
 459 }
 460
 461 static int streams_depot_stat(vfs_handle_struct *handle,
 462                               struct smb_filename *smb_fname)
 463 {
 464         struct smb_filename *smb_fname_stream = NULL;
 465         NTSTATUS status;
 466         int ret = -1;
 467
 468         DEBUG(10, ("streams_depot_stat called for [%s]\n",
 469                    smb_fname_str_dbg(smb_fname)));
 470
 471         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 472                 return SMB_VFS_NEXT_STAT(handle, smb_fname);
 473         }
 474
 475         /* If the default stream is requested, just stat the base file. */
 476         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 477                 return streams_depot_stat_base(handle, smb_fname, true);
 478         }
 479
 480         /* Stat the actual stream now. */
 481         status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
 482                                   false);
 483         if (!NT_STATUS_IS_OK(status)) {
 484                 ret = -1;
 485                 errno = map_errno_from_nt_status(status);
 486                 goto done;
 487         }
 488
 489         ret = SMB_VFS_NEXT_STAT(handle, smb_fname_stream);
 490
 491         /* Update the original smb_fname with the stat info. */
 492         smb_fname->st = smb_fname_stream->st;
 493  done:
 494         TALLOC_FREE(smb_fname_stream);
 495         return ret;
 496 }
 497
 498
 499
 500 static int streams_depot_lstat(vfs_handle_struct *handle,
 501                                struct smb_filename *smb_fname)
 502 {
 503         struct smb_filename *smb_fname_stream = NULL;
 504         NTSTATUS status;
 505         int ret = -1;
 506
 507         DEBUG(10, ("streams_depot_lstat called for [%s]\n",
 508                    smb_fname_str_dbg(smb_fname)));
 509
 510         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 511                 return SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 512         }
 513
 514         /* If the default stream is requested, just stat the base file. */
 515         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 516                 return streams_depot_stat_base(handle, smb_fname, false);
 517         }
 518
 519         /* Stat the actual stream now. */
 520         status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
 521                                   false);
 522         if (!NT_STATUS_IS_OK(status)) {
 523                 ret = -1;
 524                 errno = map_errno_from_nt_status(status);
 525                 goto done;
 526         }
 527
 528         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_stream);
 529
 530  done:
 531         TALLOC_FREE(smb_fname_stream);
 532         return ret;
 533 }
 534
 535 static int streams_depot_open(vfs_handle_struct *handle,
 536                               struct smb_filename *smb_fname,
 537                               files_struct *fsp, int flags, mode_t mode)
 538 {
 539         struct smb_filename *smb_fname_stream = NULL;
 540         struct smb_filename *smb_fname_base = NULL;
 541         NTSTATUS status;
 542         int ret = -1;
 543
 544         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 545                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 546         }
 547
 548         /* If the default stream is requested, just open the base file. */
 549         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 550                 char *tmp_stream_name;
 551
 552                 tmp_stream_name = smb_fname->stream_name;
 553                 smb_fname->stream_name = NULL;
 554                 ret = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 555                 smb_fname->stream_name = tmp_stream_name;
 556
 557                 return ret;
 558         }
 559
 560         /* Ensure the base file still exists. */
 561         status = create_synthetic_smb_fname(talloc_tos(),
 562                                             smb_fname->base_name,
 563                                             NULL, NULL,
 564                                             &smb_fname_base);
 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_base);
 572         if (ret == -1) {
 573                 goto done;
 574         }
 575
 576         /* Determine the stream name, and then open it. */
 577         status = stream_smb_fname(handle, smb_fname, &smb_fname_stream, true);
 578         if (!NT_STATUS_IS_OK(status)) {
 579                 ret = -1;
 580                 errno = map_errno_from_nt_status(status);
 581                 goto done;
 582         }
 583
 584         ret = SMB_VFS_NEXT_OPEN(handle, smb_fname_stream, fsp, flags, mode);
 585
 586  done:
 587         TALLOC_FREE(smb_fname_stream);
 588         TALLOC_FREE(smb_fname_base);
 589         return ret;
 590 }
 591
 592 static int streams_depot_unlink(vfs_handle_struct *handle,
 593                                 const struct smb_filename *smb_fname)
 594 {
 595         struct smb_filename *smb_fname_base = NULL;
 596         NTSTATUS status;
 597         int ret = -1;
 598
 599         DEBUG(10, ("streams_depot_unlink called for %s\n",
 600                    smb_fname_str_dbg(smb_fname)));
 601
 602         /* If there is a valid stream, just unlink the stream and return. */
 603         if (is_ntfs_stream_smb_fname(smb_fname) &&
 604             !is_ntfs_default_stream_smb_fname(smb_fname)) {
 605                 struct smb_filename *smb_fname_stream = NULL;
 606
 607                 status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
 608                                           false);
 609                 if (!NT_STATUS_IS_OK(status)) {
 610                         errno = map_errno_from_nt_status(status);
 611                         return -1;
 612                 }
 613
 614                 ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname_stream);
 615
 616                 TALLOC_FREE(smb_fname_stream);
 617                 return ret;
 618         }
 619
 620         /*
 621          * We potentially need to delete the per-inode streams directory
 622          */
 623
 624         status = create_synthetic_smb_fname(talloc_tos(), smb_fname->base_name,
 625                                             NULL, NULL, &smb_fname_base);
 626         if (!NT_STATUS_IS_OK(status)) {
 627                 errno = map_errno_from_nt_status(status);
 628                 return -1;
 629         }
 630
 631         if (lp_posix_pathnames()) {
 632                 ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_base);
 633         } else {
 634                 ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 635         }
 636
 637         if (ret == -1) {
 638                 TALLOC_FREE(smb_fname_base);
 639                 return -1;
 640         }
 641
 642         if (smb_fname_base->st.st_ex_nlink == 1) {
 643                 char *dirname = stream_dir(handle, smb_fname_base,
 644                                            &smb_fname_base->st, false);
 645
 646                 if (dirname != NULL) {
 647                         SMB_VFS_NEXT_RMDIR(handle, dirname);
 648                 }
 649                 TALLOC_FREE(dirname);
 650         }
 651
 652         ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname);
 653
 654         TALLOC_FREE(smb_fname_base);
 655         return ret;
 656 }
 657
 658 static int streams_depot_rename(vfs_handle_struct *handle,
 659                                 const struct smb_filename *smb_fname_src,
 660                                 const struct smb_filename *smb_fname_dst)
 661 {
 662         struct smb_filename *smb_fname_src_stream = NULL;
 663         struct smb_filename *smb_fname_dst_stream = NULL;
 664         struct smb_filename *smb_fname_dst_mod = NULL;
 665         bool src_is_stream, dst_is_stream;
 666         NTSTATUS status;
 667         int ret = -1;
 668
 669         DEBUG(10, ("streams_depot_rename called for %s => %s\n",
 670                    smb_fname_str_dbg(smb_fname_src),
 671                    smb_fname_str_dbg(smb_fname_dst)));
 672
 673         src_is_stream = is_ntfs_stream_smb_fname(smb_fname_src);
 674         dst_is_stream = is_ntfs_stream_smb_fname(smb_fname_dst);
 675
 676         if (!src_is_stream && !dst_is_stream) {
 677                 return SMB_VFS_NEXT_RENAME(handle, smb_fname_src,
 678                                            smb_fname_dst);
 679         }
 680
 681         /* for now don't allow renames from or to the default stream */
 682         if (is_ntfs_default_stream_smb_fname(smb_fname_src) ||
 683             is_ntfs_default_stream_smb_fname(smb_fname_dst)) {
 684                 errno = ENOSYS;
 685                 goto done;
 686         }
 687
 688         status = stream_smb_fname(handle, smb_fname_src, &smb_fname_src_stream,
 689                                   false);
 690         if (!NT_STATUS_IS_OK(status)) {
 691                 errno = map_errno_from_nt_status(status);
 692                 goto done;
 693         }
 694
 695         /*
 696          * Handle passing in a stream name without the base file.  This is
 697          * exercised by the NTRENAME streams rename path.
 698          */
 699         if (StrCaseCmp(smb_fname_dst->base_name, "./") == 0) {
 700                 status = create_synthetic_smb_fname(talloc_tos(),
 701                                                     smb_fname_src->base_name,
 702                                                     smb_fname_dst->stream_name,
 703                                                     NULL, &smb_fname_dst_mod);
 704                 if (!NT_STATUS_IS_OK(status)) {
 705                         errno = map_errno_from_nt_status(status);
 706                         goto done;
 707                 }
 708         }
 709
 710         status = stream_smb_fname(handle, (smb_fname_dst_mod ?
 711                                            smb_fname_dst_mod : smb_fname_dst),
 712                                   &smb_fname_dst_stream, false);
 713         if (!NT_STATUS_IS_OK(status)) {
 714                 errno = map_errno_from_nt_status(status);
 715                 goto done;
 716         }
 717
 718         ret = SMB_VFS_NEXT_RENAME(handle, smb_fname_src_stream,
 719                                   smb_fname_dst_stream);
 720
 721 done:
 722         TALLOC_FREE(smb_fname_src_stream);
 723         TALLOC_FREE(smb_fname_dst_stream);
 724         TALLOC_FREE(smb_fname_dst_mod);
 725         return ret;
 726 }
 727
 728 static bool add_one_stream(TALLOC_CTX *mem_ctx, unsigned int *num_streams,
 729                            struct stream_struct **streams,
 730                            const char *name, SMB_OFF_T size,
 731                            SMB_OFF_T alloc_size)
 732 {
 733         struct stream_struct *tmp;
 734
 735         tmp = TALLOC_REALLOC_ARRAY(mem_ctx, *streams, struct stream_struct,
 736                                    (*num_streams)+1);
 737         if (tmp == NULL) {
 738                 return false;
 739         }
 740
 741         tmp[*num_streams].name = talloc_strdup(tmp, name);
 742         if (tmp[*num_streams].name == NULL) {
 743                 return false;
 744         }
 745
 746         tmp[*num_streams].size = size;
 747         tmp[*num_streams].alloc_size = alloc_size;
 748
 749         *streams = tmp;
 750         *num_streams += 1;
 751         return true;
 752 }
 753
 754 struct streaminfo_state {
 755         TALLOC_CTX *mem_ctx;
 756         vfs_handle_struct *handle;
 757         unsigned int num_streams;
 758         struct stream_struct *streams;
 759         NTSTATUS status;
 760 };
 761
 762 static bool collect_one_stream(const char *dirname,
 763                                const char *dirent,
 764                                void *private_data)
 765 {
 766         struct streaminfo_state *state =
 767                 (struct streaminfo_state *)private_data;
 768         struct smb_filename *smb_fname = NULL;
 769         char *sname = NULL;
 770         NTSTATUS status;
 771         bool ret;
 772
 773         sname = talloc_asprintf(talloc_tos(), "%s/%s", dirname, dirent);
 774         if (sname == NULL) {
 775                 state->status = NT_STATUS_NO_MEMORY;
 776                 ret = false;
 777                 goto out;
 778         }
 779
 780         status = create_synthetic_smb_fname(talloc_tos(), sname, NULL,
 781                                             NULL, &smb_fname);
 782         if (!NT_STATUS_IS_OK(status)) {
 783                 state->status = status;
 784                 ret = false;
 785                 goto out;
 786         }
 787
 788         if (SMB_VFS_NEXT_STAT(state->handle, smb_fname) == -1) {
 789                 DEBUG(10, ("Could not stat %s: %s\n", sname,
 790                            strerror(errno)));
 791                 ret = true;
 792                 goto out;
 793         }
 794
 795         if (!add_one_stream(state->mem_ctx,
 796                             &state->num_streams, &state->streams,
 797                             dirent, smb_fname->st.st_ex_size,
 798                             SMB_VFS_GET_ALLOC_SIZE(state->handle->conn, NULL,
 799                                                    &smb_fname->st))) {
 800                 state->status = NT_STATUS_NO_MEMORY;
 801                 ret = false;
 802                 goto out;
 803         }
 804
 805         ret = true;
 806  out:
 807         TALLOC_FREE(sname);
 808         TALLOC_FREE(smb_fname);
 809         return ret;
 810 }
 811
 812 static NTSTATUS streams_depot_streaminfo(vfs_handle_struct *handle,
 813                                          struct files_struct *fsp,
 814                                          const char *fname,
 815                                          TALLOC_CTX *mem_ctx,
 816                                          unsigned int *pnum_streams,
 817                                          struct stream_struct **pstreams)
 818 {
 819         struct smb_filename *smb_fname_base = NULL;
 820         int ret;
 821         NTSTATUS status;
 822         struct streaminfo_state state;
 823
 824         status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
 825                                             &smb_fname_base);
 826         if (!NT_STATUS_IS_OK(status)) {
 827                 return status;
 828         }
 829
 830         if ((fsp != NULL) && (fsp->fh->fd != -1)) {
 831                 ret = SMB_VFS_NEXT_FSTAT(handle, fsp, &smb_fname_base->st);
 832         }
 833         else {
 834                 if (lp_posix_pathnames()) {
 835                         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_base);
 836                 } else {
 837                         ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 838                 }
 839         }
 840
 841         if (ret == -1) {
 842                 status = map_nt_error_from_unix(errno);
 843                 goto out;
 844         }
 845
 846         state.streams = NULL;
 847         state.num_streams = 0;
 848
 849         if (!S_ISDIR(smb_fname_base->st.st_ex_mode)) {
 850                 if (!add_one_stream(mem_ctx,
 851                                     &state.num_streams, &state.streams,
 852                                     "::$DATA", smb_fname_base->st.st_ex_size,
 853                                     SMB_VFS_GET_ALLOC_SIZE(handle->conn, fsp,
 854                                                        &smb_fname_base->st))) {
 855                         status = NT_STATUS_NO_MEMORY;
 856                         goto out;
 857                 }
 858         }
 859
 860         state.mem_ctx = mem_ctx;
 861         state.handle = handle;
 862         state.status = NT_STATUS_OK;
 863
 864         status = walk_streams(handle, smb_fname_base, NULL, collect_one_stream,
 865                               &state);
 866
 867         if (!NT_STATUS_IS_OK(status)) {
 868                 TALLOC_FREE(state.streams);
 869                 goto out;
 870         }
 871
 872         if (!NT_STATUS_IS_OK(state.status)) {
 873                 TALLOC_FREE(state.streams);
 874                 status = state.status;
 875                 goto out;
 876         }
 877
 878         *pnum_streams = state.num_streams;
 879         *pstreams = state.streams;
 880         status = NT_STATUS_OK;
 881
 882  out:
 883         TALLOC_FREE(smb_fname_base);
 884         return status;
 885 }
 886
 887 static uint32_t streams_depot_fs_capabilities(struct vfs_handle_struct *handle,
 888                         enum timestamp_set_resolution *p_ts_res)
 889 {
 890         return SMB_VFS_NEXT_FS_CAPABILITIES(handle, p_ts_res) | FILE_NAMED_STREAMS;
 891 }
 892
 893 static struct vfs_fn_pointers vfs_streams_depot_fns = {
 894         .fs_capabilities = streams_depot_fs_capabilities,
 895         .open = streams_depot_open,
 896         .stat = streams_depot_stat,
 897         .lstat = streams_depot_lstat,
 898         .unlink = streams_depot_unlink,
 899         .rename = streams_depot_rename,
 900         .streaminfo = streams_depot_streaminfo,
 901 };
 902
 903 NTSTATUS vfs_streams_depot_init(void);
 904 NTSTATUS vfs_streams_depot_init(void)
 905 {
 906         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "streams_depot",
 907                                 &vfs_streams_depot_fns);
 908 }