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                 if (!strupper_m(strrchr_m(stream_fname, ':') + 1)) {
 349                         status = NT_STATUS_INVALID_PARAMETER;
 350                         goto fail;
 351                 }
 352         }
 353
 354         DEBUG(10, ("stream filename = %s\n", stream_fname));
 355
 356         /* Create an smb_filename with stream_name == NULL. */
 357         status = create_synthetic_smb_fname(talloc_tos(), stream_fname, NULL,
 358                                             NULL, smb_fname_out);
 359         if (!NT_STATUS_IS_OK(status)) {
 360                 return status;
 361         }
 362
 363         return NT_STATUS_OK;
 364
 365  fail:
 366         DEBUG(5, ("stream_name failed: %s\n", strerror(errno)));
 367         TALLOC_FREE(*smb_fname_out);
 368         return status;
 369 }
 370
 371 static NTSTATUS walk_streams(vfs_handle_struct *handle,
 372                              struct smb_filename *smb_fname_base,
 373                              char **pdirname,
 374                              bool (*fn)(const char *dirname,
 375                                         const char *dirent,
 376                                         void *private_data),
 377                              void *private_data)
 378 {
 379         char *dirname;
 380         DIR *dirhandle = NULL;
 381         const char *dirent = NULL;
 382         char *talloced = NULL;
 383
 384         dirname = stream_dir(handle, smb_fname_base, &smb_fname_base->st,
 385                              false);
 386
 387         if (dirname == NULL) {
 388                 if (errno == ENOENT) {
 389                         /*
 390                          * no stream around
 391                          */
 392                         return NT_STATUS_OK;
 393                 }
 394                 return map_nt_error_from_unix(errno);
 395         }
 396
 397         DEBUG(10, ("walk_streams: dirname=%s\n", dirname));
 398
 399         dirhandle = SMB_VFS_NEXT_OPENDIR(handle, dirname, NULL, 0);
 400
 401         if (dirhandle == NULL) {
 402                 TALLOC_FREE(dirname);
 403                 return map_nt_error_from_unix(errno);
 404         }
 405
 406         while ((dirent = vfs_readdirname(handle->conn, dirhandle, NULL,
 407                                          &talloced)) != NULL) {
 408
 409                 if (ISDOT(dirent) || ISDOTDOT(dirent)) {
 410                         TALLOC_FREE(talloced);
 411                         continue;
 412                 }
 413
 414                 DEBUG(10, ("walk_streams: dirent=%s\n", dirent));
 415
 416                 if (!fn(dirname, dirent, private_data)) {
 417                         TALLOC_FREE(talloced);
 418                         break;
 419                 }
 420                 TALLOC_FREE(talloced);
 421         }
 422
 423         SMB_VFS_NEXT_CLOSEDIR(handle, dirhandle);
 424
 425         if (pdirname != NULL) {
 426                 *pdirname = dirname;
 427         }
 428         else {
 429                 TALLOC_FREE(dirname);
 430         }
 431
 432         return NT_STATUS_OK;
 433 }
 434
 435 /**
 436  * Helper to stat/lstat the base file of an smb_fname. This will actually
 437  * fills in the stat struct in smb_filename.
 438  */
 439 static int streams_depot_stat_base(vfs_handle_struct *handle,
 440                                    struct smb_filename *smb_fname,
 441                                    bool follow_links)
 442 {
 443         char *tmp_stream_name;
 444         int result;
 445
 446         tmp_stream_name = smb_fname->stream_name;
 447         smb_fname->stream_name = NULL;
 448         if (follow_links) {
 449                 result = SMB_VFS_NEXT_STAT(handle, smb_fname);
 450         } else {
 451                 result = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 452         }
 453         smb_fname->stream_name = tmp_stream_name;
 454         return result;
 455 }
 456
 457 static int streams_depot_stat(vfs_handle_struct *handle,
 458                               struct smb_filename *smb_fname)
 459 {
 460         struct smb_filename *smb_fname_stream = NULL;
 461         NTSTATUS status;
 462         int ret = -1;
 463
 464         DEBUG(10, ("streams_depot_stat called for [%s]\n",
 465                    smb_fname_str_dbg(smb_fname)));
 466
 467         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 468                 return SMB_VFS_NEXT_STAT(handle, smb_fname);
 469         }
 470
 471         /* If the default stream is requested, just stat the base file. */
 472         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 473                 return streams_depot_stat_base(handle, smb_fname, true);
 474         }
 475
 476         /* Stat the actual stream now. */
 477         status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
 478                                   false);
 479         if (!NT_STATUS_IS_OK(status)) {
 480                 ret = -1;
 481                 errno = map_errno_from_nt_status(status);
 482                 goto done;
 483         }
 484
 485         ret = SMB_VFS_NEXT_STAT(handle, smb_fname_stream);
 486
 487         /* Update the original smb_fname with the stat info. */
 488         smb_fname->st = smb_fname_stream->st;
 489  done:
 490         TALLOC_FREE(smb_fname_stream);
 491         return ret;
 492 }
 493
 494
 495
 496 static int streams_depot_lstat(vfs_handle_struct *handle,
 497                                struct smb_filename *smb_fname)
 498 {
 499         struct smb_filename *smb_fname_stream = NULL;
 500         NTSTATUS status;
 501         int ret = -1;
 502
 503         DEBUG(10, ("streams_depot_lstat called for [%s]\n",
 504                    smb_fname_str_dbg(smb_fname)));
 505
 506         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 507                 return SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 508         }
 509
 510         /* If the default stream is requested, just stat the base file. */
 511         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 512                 return streams_depot_stat_base(handle, smb_fname, false);
 513         }
 514
 515         /* Stat the actual stream now. */
 516         status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
 517                                   false);
 518         if (!NT_STATUS_IS_OK(status)) {
 519                 ret = -1;
 520                 errno = map_errno_from_nt_status(status);
 521                 goto done;
 522         }
 523
 524         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_stream);
 525
 526  done:
 527         TALLOC_FREE(smb_fname_stream);
 528         return ret;
 529 }
 530
 531 static int streams_depot_open(vfs_handle_struct *handle,
 532                               struct smb_filename *smb_fname,
 533                               files_struct *fsp, int flags, mode_t mode)
 534 {
 535         struct smb_filename *smb_fname_stream = NULL;
 536         struct smb_filename *smb_fname_base = NULL;
 537         NTSTATUS status;
 538         int ret = -1;
 539
 540         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 541                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 542         }
 543
 544         /* If the default stream is requested, just open the base file. */
 545         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 546                 char *tmp_stream_name;
 547
 548                 tmp_stream_name = smb_fname->stream_name;
 549                 smb_fname->stream_name = NULL;
 550                 ret = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 551                 smb_fname->stream_name = tmp_stream_name;
 552
 553                 return ret;
 554         }
 555
 556         /* Ensure the base file still exists. */
 557         status = create_synthetic_smb_fname(talloc_tos(),
 558                                             smb_fname->base_name,
 559                                             NULL, NULL,
 560                                             &smb_fname_base);
 561         if (!NT_STATUS_IS_OK(status)) {
 562                 ret = -1;
 563                 errno = map_errno_from_nt_status(status);
 564                 goto done;
 565         }
 566
 567         ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 568         if (ret == -1) {
 569                 goto done;
 570         }
 571
 572         /* Determine the stream name, and then open it. */
 573         status = stream_smb_fname(handle, smb_fname, &smb_fname_stream, true);
 574         if (!NT_STATUS_IS_OK(status)) {
 575                 ret = -1;
 576                 errno = map_errno_from_nt_status(status);
 577                 goto done;
 578         }
 579
 580         ret = SMB_VFS_NEXT_OPEN(handle, smb_fname_stream, fsp, flags, mode);
 581
 582  done:
 583         TALLOC_FREE(smb_fname_stream);
 584         TALLOC_FREE(smb_fname_base);
 585         return ret;
 586 }
 587
 588 static int streams_depot_unlink(vfs_handle_struct *handle,
 589                                 const struct smb_filename *smb_fname)
 590 {
 591         struct smb_filename *smb_fname_base = NULL;
 592         NTSTATUS status;
 593         int ret = -1;
 594
 595         DEBUG(10, ("streams_depot_unlink called for %s\n",
 596                    smb_fname_str_dbg(smb_fname)));
 597
 598         /* If there is a valid stream, just unlink the stream and return. */
 599         if (is_ntfs_stream_smb_fname(smb_fname) &&
 600             !is_ntfs_default_stream_smb_fname(smb_fname)) {
 601                 struct smb_filename *smb_fname_stream = NULL;
 602
 603                 status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
 604                                           false);
 605                 if (!NT_STATUS_IS_OK(status)) {
 606                         errno = map_errno_from_nt_status(status);
 607                         return -1;
 608                 }
 609
 610                 ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname_stream);
 611
 612                 TALLOC_FREE(smb_fname_stream);
 613                 return ret;
 614         }
 615
 616         /*
 617          * We potentially need to delete the per-inode streams directory
 618          */
 619
 620         status = create_synthetic_smb_fname(talloc_tos(), smb_fname->base_name,
 621                                             NULL, NULL, &smb_fname_base);
 622         if (!NT_STATUS_IS_OK(status)) {
 623                 errno = map_errno_from_nt_status(status);
 624                 return -1;
 625         }
 626
 627         if (lp_posix_pathnames()) {
 628                 ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_base);
 629         } else {
 630                 ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 631         }
 632
 633         if (ret == -1) {
 634                 TALLOC_FREE(smb_fname_base);
 635                 return -1;
 636         }
 637
 638         if (smb_fname_base->st.st_ex_nlink == 1) {
 639                 char *dirname = stream_dir(handle, smb_fname_base,
 640                                            &smb_fname_base->st, false);
 641
 642                 if (dirname != NULL) {
 643                         SMB_VFS_NEXT_RMDIR(handle, dirname);
 644                 }
 645                 TALLOC_FREE(dirname);
 646         }
 647
 648         ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname);
 649
 650         TALLOC_FREE(smb_fname_base);
 651         return ret;
 652 }
 653
 654 static int streams_depot_rmdir(vfs_handle_struct *handle, const char *path)
 655 {
 656         struct smb_filename *smb_fname_base = NULL;
 657         NTSTATUS status;
 658         int ret = -1;
 659
 660         DEBUG(10, ("streams_depot_rmdir called for %s\n", path));
 661
 662         /*
 663          * We potentially need to delete the per-inode streams directory
 664          */
 665
 666         status = create_synthetic_smb_fname(talloc_tos(), path,
 667                                             NULL, NULL, &smb_fname_base);
 668         if (!NT_STATUS_IS_OK(status)) {
 669                 errno = map_errno_from_nt_status(status);
 670                 return -1;
 671         }
 672
 673         if (lp_posix_pathnames()) {
 674                 ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_base);
 675         } else {
 676                 ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 677         }
 678
 679         if (ret == -1) {
 680                 TALLOC_FREE(smb_fname_base);
 681                 return -1;
 682         }
 683
 684         if (smb_fname_base->st.st_ex_nlink == 2) {
 685                 char *dirname = stream_dir(handle, smb_fname_base,
 686                                            &smb_fname_base->st, false);
 687
 688                 if (dirname != NULL) {
 689                         SMB_VFS_NEXT_RMDIR(handle, dirname);
 690                 }
 691                 TALLOC_FREE(dirname);
 692         }
 693
 694         ret = SMB_VFS_NEXT_RMDIR(handle, path);
 695
 696         TALLOC_FREE(smb_fname_base);
 697         return ret;
 698 }
 699
 700 static int streams_depot_rename(vfs_handle_struct *handle,
 701                                 const struct smb_filename *smb_fname_src,
 702                                 const struct smb_filename *smb_fname_dst)
 703 {
 704         struct smb_filename *smb_fname_src_stream = NULL;
 705         struct smb_filename *smb_fname_dst_stream = NULL;
 706         bool src_is_stream, dst_is_stream;
 707         NTSTATUS status;
 708         int ret = -1;
 709
 710         DEBUG(10, ("streams_depot_rename called for %s => %s\n",
 711                    smb_fname_str_dbg(smb_fname_src),
 712                    smb_fname_str_dbg(smb_fname_dst)));
 713
 714         src_is_stream = is_ntfs_stream_smb_fname(smb_fname_src);
 715         dst_is_stream = is_ntfs_stream_smb_fname(smb_fname_dst);
 716
 717         if (!src_is_stream && !dst_is_stream) {
 718                 return SMB_VFS_NEXT_RENAME(handle, smb_fname_src,
 719                                            smb_fname_dst);
 720         }
 721
 722         /* for now don't allow renames from or to the default stream */
 723         if (is_ntfs_default_stream_smb_fname(smb_fname_src) ||
 724             is_ntfs_default_stream_smb_fname(smb_fname_dst)) {
 725                 errno = ENOSYS;
 726                 goto done;
 727         }
 728
 729         status = stream_smb_fname(handle, smb_fname_src, &smb_fname_src_stream,
 730                                   false);
 731         if (!NT_STATUS_IS_OK(status)) {
 732                 errno = map_errno_from_nt_status(status);
 733                 goto done;
 734         }
 735
 736         status = stream_smb_fname(handle, smb_fname_dst,
 737                                   &smb_fname_dst_stream, false);
 738         if (!NT_STATUS_IS_OK(status)) {
 739                 errno = map_errno_from_nt_status(status);
 740                 goto done;
 741         }
 742
 743         ret = SMB_VFS_NEXT_RENAME(handle, smb_fname_src_stream,
 744                                   smb_fname_dst_stream);
 745
 746 done:
 747         TALLOC_FREE(smb_fname_src_stream);
 748         TALLOC_FREE(smb_fname_dst_stream);
 749         return ret;
 750 }
 751
 752 static bool add_one_stream(TALLOC_CTX *mem_ctx, unsigned int *num_streams,
 753                            struct stream_struct **streams,
 754                            const char *name, off_t size,
 755                            off_t alloc_size)
 756 {
 757         struct stream_struct *tmp;
 758
 759         tmp = talloc_realloc(mem_ctx, *streams, struct stream_struct,
 760                                    (*num_streams)+1);
 761         if (tmp == NULL) {
 762                 return false;
 763         }
 764
 765         tmp[*num_streams].name = talloc_strdup(tmp, name);
 766         if (tmp[*num_streams].name == NULL) {
 767                 return false;
 768         }
 769
 770         tmp[*num_streams].size = size;
 771         tmp[*num_streams].alloc_size = alloc_size;
 772
 773         *streams = tmp;
 774         *num_streams += 1;
 775         return true;
 776 }
 777
 778 struct streaminfo_state {
 779         TALLOC_CTX *mem_ctx;
 780         vfs_handle_struct *handle;
 781         unsigned int num_streams;
 782         struct stream_struct *streams;
 783         NTSTATUS status;
 784 };
 785
 786 static bool collect_one_stream(const char *dirname,
 787                                const char *dirent,
 788                                void *private_data)
 789 {
 790         struct streaminfo_state *state =
 791                 (struct streaminfo_state *)private_data;
 792         struct smb_filename *smb_fname = NULL;
 793         char *sname = NULL;
 794         NTSTATUS status;
 795         bool ret;
 796
 797         sname = talloc_asprintf(talloc_tos(), "%s/%s", dirname, dirent);
 798         if (sname == NULL) {
 799                 state->status = NT_STATUS_NO_MEMORY;
 800                 ret = false;
 801                 goto out;
 802         }
 803
 804         status = create_synthetic_smb_fname(talloc_tos(), sname, NULL,
 805                                             NULL, &smb_fname);
 806         if (!NT_STATUS_IS_OK(status)) {
 807                 state->status = status;
 808                 ret = false;
 809                 goto out;
 810         }
 811
 812         if (SMB_VFS_NEXT_STAT(state->handle, smb_fname) == -1) {
 813                 DEBUG(10, ("Could not stat %s: %s\n", sname,
 814                            strerror(errno)));
 815                 ret = true;
 816                 goto out;
 817         }
 818
 819         if (!add_one_stream(state->mem_ctx,
 820                             &state->num_streams, &state->streams,
 821                             dirent, smb_fname->st.st_ex_size,
 822                             SMB_VFS_GET_ALLOC_SIZE(state->handle->conn, NULL,
 823                                                    &smb_fname->st))) {
 824                 state->status = NT_STATUS_NO_MEMORY;
 825                 ret = false;
 826                 goto out;
 827         }
 828
 829         ret = true;
 830  out:
 831         TALLOC_FREE(sname);
 832         TALLOC_FREE(smb_fname);
 833         return ret;
 834 }
 835
 836 static NTSTATUS streams_depot_streaminfo(vfs_handle_struct *handle,
 837                                          struct files_struct *fsp,
 838                                          const char *fname,
 839                                          TALLOC_CTX *mem_ctx,
 840                                          unsigned int *pnum_streams,
 841                                          struct stream_struct **pstreams)
 842 {
 843         struct smb_filename *smb_fname_base = NULL;
 844         int ret;
 845         NTSTATUS status;
 846         struct streaminfo_state state;
 847
 848         status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
 849                                             &smb_fname_base);
 850         if (!NT_STATUS_IS_OK(status)) {
 851                 return status;
 852         }
 853
 854         if ((fsp != NULL) && (fsp->fh->fd != -1)) {
 855                 ret = SMB_VFS_NEXT_FSTAT(handle, fsp, &smb_fname_base->st);
 856         }
 857         else {
 858                 if (lp_posix_pathnames()) {
 859                         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_base);
 860                 } else {
 861                         ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 862                 }
 863         }
 864
 865         if (ret == -1) {
 866                 status = map_nt_error_from_unix(errno);
 867                 goto out;
 868         }
 869
 870         state.streams = *pstreams;
 871         state.num_streams = *pnum_streams;
 872         state.mem_ctx = mem_ctx;
 873         state.handle = handle;
 874         state.status = NT_STATUS_OK;
 875
 876         status = walk_streams(handle, smb_fname_base, NULL, collect_one_stream,
 877                               &state);
 878
 879         if (!NT_STATUS_IS_OK(status)) {
 880                 TALLOC_FREE(state.streams);
 881                 goto out;
 882         }
 883
 884         if (!NT_STATUS_IS_OK(state.status)) {
 885                 TALLOC_FREE(state.streams);
 886                 status = state.status;
 887                 goto out;
 888         }
 889
 890         *pnum_streams = state.num_streams;
 891         *pstreams = state.streams;
 892         status = SMB_VFS_NEXT_STREAMINFO(handle, fsp, fname, mem_ctx, pnum_streams, pstreams);
 893
 894  out:
 895         TALLOC_FREE(smb_fname_base);
 896         return status;
 897 }
 898
 899 static uint32_t streams_depot_fs_capabilities(struct vfs_handle_struct *handle,
 900                         enum timestamp_set_resolution *p_ts_res)
 901 {
 902         return SMB_VFS_NEXT_FS_CAPABILITIES(handle, p_ts_res) | FILE_NAMED_STREAMS;
 903 }
 904
 905 static struct vfs_fn_pointers vfs_streams_depot_fns = {
 906         .fs_capabilities_fn = streams_depot_fs_capabilities,
 907         .open_fn = streams_depot_open,
 908         .stat_fn = streams_depot_stat,
 909         .lstat_fn = streams_depot_lstat,
 910         .unlink_fn = streams_depot_unlink,
 911         .rmdir_fn = streams_depot_rmdir,
 912         .rename_fn = streams_depot_rename,
 913         .streaminfo_fn = streams_depot_streaminfo,
 914 };
 915
 916 NTSTATUS vfs_streams_depot_init(void);
 917 NTSTATUS vfs_streams_depot_init(void)
 918 {
 919         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "streams_depot",
 920                                 &vfs_streams_depot_fns);
 921 }