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->cwd);
 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                 bool delete_lost;
 202
 203                 if (!S_ISDIR(smb_fname_hash->st.st_ex_mode)) {
 204                         errno = EINVAL;
 205                         goto fail;
 206                 }
 207
 208                 if (!check_valid ||
 209                     file_is_valid(handle, smb_fname->base_name)) {
 210                         return result;
 211                 }
 212
 213                 /*
 214                  * Someone has recreated a file under an existing inode
 215                  * without deleting the streams directory.
 216                  * Move it away or remove if streams_depot:delete_lost is set.
 217                  */
 218
 219         again:
 220                 delete_lost = lp_parm_bool(SNUM(handle->conn), "streams_depot",
 221                                            "delete_lost", false);
 222
 223                 if (delete_lost) {
 224                         DEBUG(3, ("Someone has recreated a file under an "
 225                               "existing inode. Removing: %s\n",
 226                               smb_fname_hash->base_name));
 227                         recursive_rmdir(talloc_tos(), handle->conn,
 228                                         smb_fname_hash);
 229                         SMB_VFS_NEXT_RMDIR(handle, smb_fname_hash->base_name);
 230                 } else {
 231                         newname = talloc_asprintf(talloc_tos(), "lost-%lu",
 232                                                   random());
 233                         DEBUG(3, ("Someone has recreated a file under an "
 234                               "existing inode. Renaming: %s to: %s\n",
 235                               smb_fname_hash->base_name,
 236                               newname));
 237                         if (newname == NULL) {
 238                                 errno = ENOMEM;
 239                                 goto fail;
 240                         }
 241
 242                         status = create_synthetic_smb_fname(talloc_tos(),
 243                                                             newname,
 244                                                             NULL, NULL,
 245                                                             &smb_fname_new);
 246                         TALLOC_FREE(newname);
 247                         if (!NT_STATUS_IS_OK(status)) {
 248                                 errno = map_errno_from_nt_status(status);
 249                                 goto fail;
 250                         }
 251
 252                         if (SMB_VFS_NEXT_RENAME(handle, smb_fname_hash,
 253                                                 smb_fname_new) == -1) {
 254                                 TALLOC_FREE(smb_fname_new);
 255                                 if ((errno == EEXIST) || (errno == ENOTEMPTY)) {
 256                                         goto again;
 257                                 }
 258                                 goto fail;
 259                         }
 260
 261                         TALLOC_FREE(smb_fname_new);
 262                 }
 263         }
 264
 265         if (!create_it) {
 266                 errno = ENOENT;
 267                 goto fail;
 268         }
 269
 270         if ((SMB_VFS_NEXT_MKDIR(handle, rootdir, 0755) != 0)
 271             && (errno != EEXIST)) {
 272                 goto fail;
 273         }
 274
 275         tmp = talloc_asprintf(result, "%s/%2.2X", rootdir, first);
 276         if (tmp == NULL) {
 277                 errno = ENOMEM;
 278                 goto fail;
 279         }
 280
 281         if ((SMB_VFS_NEXT_MKDIR(handle, tmp, 0755) != 0)
 282             && (errno != EEXIST)) {
 283                 goto fail;
 284         }
 285
 286         TALLOC_FREE(tmp);
 287
 288         tmp = talloc_asprintf(result, "%s/%2.2X/%2.2X", rootdir, first,
 289                               second);
 290         if (tmp == NULL) {
 291                 errno = ENOMEM;
 292                 goto fail;
 293         }
 294
 295         if ((SMB_VFS_NEXT_MKDIR(handle, tmp, 0755) != 0)
 296             && (errno != EEXIST)) {
 297                 goto fail;
 298         }
 299
 300         TALLOC_FREE(tmp);
 301
 302         if ((SMB_VFS_NEXT_MKDIR(handle, result, 0755) != 0)
 303             && (errno != EEXIST)) {
 304                 goto fail;
 305         }
 306
 307         if (check_valid && !mark_file_valid(handle, smb_fname->base_name)) {
 308                 goto fail;
 309         }
 310
 311         TALLOC_FREE(smb_fname_hash);
 312         return result;
 313
 314  fail:
 315         TALLOC_FREE(smb_fname_hash);
 316         TALLOC_FREE(result);
 317         return NULL;
 318 }
 319 /**
 320  * Given a stream name, populate smb_fname_out with the actual location of the
 321  * stream.
 322  */
 323 static NTSTATUS stream_smb_fname(vfs_handle_struct *handle,
 324                                  const struct smb_filename *smb_fname,
 325                                  struct smb_filename **smb_fname_out,
 326                                  bool create_dir)
 327 {
 328         char *dirname, *stream_fname;
 329         const char *stype;
 330         NTSTATUS status;
 331
 332         *smb_fname_out = NULL;
 333
 334         stype = strchr_m(smb_fname->stream_name + 1, ':');
 335
 336         if (stype) {
 337                 if (strcasecmp_m(stype, ":$DATA") != 0) {
 338                         return NT_STATUS_INVALID_PARAMETER;
 339                 }
 340         }
 341
 342         dirname = stream_dir(handle, smb_fname, NULL, create_dir);
 343
 344         if (dirname == NULL) {
 345                 status = map_nt_error_from_unix(errno);
 346                 goto fail;
 347         }
 348
 349         stream_fname = talloc_asprintf(talloc_tos(), "%s/%s", dirname,
 350                                        smb_fname->stream_name);
 351
 352         if (stream_fname == NULL) {
 353                 status = NT_STATUS_NO_MEMORY;
 354                 goto fail;
 355         }
 356
 357         if (stype == NULL) {
 358                 /* Append an explicit stream type if one wasn't specified. */
 359                 stream_fname = talloc_asprintf(talloc_tos(), "%s:$DATA",
 360                                                stream_fname);
 361                 if (stream_fname == NULL) {
 362                         status = NT_STATUS_NO_MEMORY;
 363                         goto fail;
 364                 }
 365         } else {
 366                 /* Normalize the stream type to upercase. */
 367                 if (!strupper_m(strrchr_m(stream_fname, ':') + 1)) {
 368                         status = NT_STATUS_INVALID_PARAMETER;
 369                         goto fail;
 370                 }
 371         }
 372
 373         DEBUG(10, ("stream filename = %s\n", stream_fname));
 374
 375         /* Create an smb_filename with stream_name == NULL. */
 376         status = create_synthetic_smb_fname(talloc_tos(), stream_fname, NULL,
 377                                             NULL, smb_fname_out);
 378         if (!NT_STATUS_IS_OK(status)) {
 379                 return status;
 380         }
 381
 382         return NT_STATUS_OK;
 383
 384  fail:
 385         DEBUG(5, ("stream_name failed: %s\n", strerror(errno)));
 386         TALLOC_FREE(*smb_fname_out);
 387         return status;
 388 }
 389
 390 static NTSTATUS walk_streams(vfs_handle_struct *handle,
 391                              struct smb_filename *smb_fname_base,
 392                              char **pdirname,
 393                              bool (*fn)(const char *dirname,
 394                                         const char *dirent,
 395                                         void *private_data),
 396                              void *private_data)
 397 {
 398         char *dirname;
 399         DIR *dirhandle = NULL;
 400         const char *dirent = NULL;
 401         char *talloced = NULL;
 402
 403         dirname = stream_dir(handle, smb_fname_base, &smb_fname_base->st,
 404                              false);
 405
 406         if (dirname == NULL) {
 407                 if (errno == ENOENT) {
 408                         /*
 409                          * no stream around
 410                          */
 411                         return NT_STATUS_OK;
 412                 }
 413                 return map_nt_error_from_unix(errno);
 414         }
 415
 416         DEBUG(10, ("walk_streams: dirname=%s\n", dirname));
 417
 418         dirhandle = SMB_VFS_NEXT_OPENDIR(handle, dirname, NULL, 0);
 419
 420         if (dirhandle == NULL) {
 421                 TALLOC_FREE(dirname);
 422                 return map_nt_error_from_unix(errno);
 423         }
 424
 425         while ((dirent = vfs_readdirname(handle->conn, dirhandle, NULL,
 426                                          &talloced)) != NULL) {
 427
 428                 if (ISDOT(dirent) || ISDOTDOT(dirent)) {
 429                         TALLOC_FREE(talloced);
 430                         continue;
 431                 }
 432
 433                 DEBUG(10, ("walk_streams: dirent=%s\n", dirent));
 434
 435                 if (!fn(dirname, dirent, private_data)) {
 436                         TALLOC_FREE(talloced);
 437                         break;
 438                 }
 439                 TALLOC_FREE(talloced);
 440         }
 441
 442         SMB_VFS_NEXT_CLOSEDIR(handle, dirhandle);
 443
 444         if (pdirname != NULL) {
 445                 *pdirname = dirname;
 446         }
 447         else {
 448                 TALLOC_FREE(dirname);
 449         }
 450
 451         return NT_STATUS_OK;
 452 }
 453
 454 /**
 455  * Helper to stat/lstat the base file of an smb_fname. This will actually
 456  * fills in the stat struct in smb_filename.
 457  */
 458 static int streams_depot_stat_base(vfs_handle_struct *handle,
 459                                    struct smb_filename *smb_fname,
 460                                    bool follow_links)
 461 {
 462         char *tmp_stream_name;
 463         int result;
 464
 465         tmp_stream_name = smb_fname->stream_name;
 466         smb_fname->stream_name = NULL;
 467         if (follow_links) {
 468                 result = SMB_VFS_NEXT_STAT(handle, smb_fname);
 469         } else {
 470                 result = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 471         }
 472         smb_fname->stream_name = tmp_stream_name;
 473         return result;
 474 }
 475
 476 static int streams_depot_stat(vfs_handle_struct *handle,
 477                               struct smb_filename *smb_fname)
 478 {
 479         struct smb_filename *smb_fname_stream = NULL;
 480         NTSTATUS status;
 481         int ret = -1;
 482
 483         DEBUG(10, ("streams_depot_stat called for [%s]\n",
 484                    smb_fname_str_dbg(smb_fname)));
 485
 486         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 487                 return SMB_VFS_NEXT_STAT(handle, smb_fname);
 488         }
 489
 490         /* If the default stream is requested, just stat the base file. */
 491         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 492                 return streams_depot_stat_base(handle, smb_fname, true);
 493         }
 494
 495         /* Stat the actual stream now. */
 496         status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
 497                                   false);
 498         if (!NT_STATUS_IS_OK(status)) {
 499                 ret = -1;
 500                 errno = map_errno_from_nt_status(status);
 501                 goto done;
 502         }
 503
 504         ret = SMB_VFS_NEXT_STAT(handle, smb_fname_stream);
 505
 506         /* Update the original smb_fname with the stat info. */
 507         smb_fname->st = smb_fname_stream->st;
 508  done:
 509         TALLOC_FREE(smb_fname_stream);
 510         return ret;
 511 }
 512
 513
 514
 515 static int streams_depot_lstat(vfs_handle_struct *handle,
 516                                struct smb_filename *smb_fname)
 517 {
 518         struct smb_filename *smb_fname_stream = NULL;
 519         NTSTATUS status;
 520         int ret = -1;
 521
 522         DEBUG(10, ("streams_depot_lstat called for [%s]\n",
 523                    smb_fname_str_dbg(smb_fname)));
 524
 525         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 526                 return SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 527         }
 528
 529         /* If the default stream is requested, just stat the base file. */
 530         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 531                 return streams_depot_stat_base(handle, smb_fname, false);
 532         }
 533
 534         /* Stat the actual stream now. */
 535         status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
 536                                   false);
 537         if (!NT_STATUS_IS_OK(status)) {
 538                 ret = -1;
 539                 errno = map_errno_from_nt_status(status);
 540                 goto done;
 541         }
 542
 543         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_stream);
 544
 545  done:
 546         TALLOC_FREE(smb_fname_stream);
 547         return ret;
 548 }
 549
 550 static int streams_depot_open(vfs_handle_struct *handle,
 551                               struct smb_filename *smb_fname,
 552                               files_struct *fsp, int flags, mode_t mode)
 553 {
 554         struct smb_filename *smb_fname_stream = NULL;
 555         struct smb_filename *smb_fname_base = NULL;
 556         NTSTATUS status;
 557         int ret = -1;
 558
 559         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 560                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 561         }
 562
 563         /* If the default stream is requested, just open the base file. */
 564         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 565                 char *tmp_stream_name;
 566
 567                 tmp_stream_name = smb_fname->stream_name;
 568                 smb_fname->stream_name = NULL;
 569                 ret = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 570                 smb_fname->stream_name = tmp_stream_name;
 571
 572                 return ret;
 573         }
 574
 575         /* Ensure the base file still exists. */
 576         status = create_synthetic_smb_fname(talloc_tos(),
 577                                             smb_fname->base_name,
 578                                             NULL, NULL,
 579                                             &smb_fname_base);
 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_STAT(handle, smb_fname_base);
 587         if (ret == -1) {
 588                 goto done;
 589         }
 590
 591         /* Determine the stream name, and then open it. */
 592         status = stream_smb_fname(handle, smb_fname, &smb_fname_stream, true);
 593         if (!NT_STATUS_IS_OK(status)) {
 594                 ret = -1;
 595                 errno = map_errno_from_nt_status(status);
 596                 goto done;
 597         }
 598
 599         ret = SMB_VFS_NEXT_OPEN(handle, smb_fname_stream, fsp, flags, mode);
 600
 601  done:
 602         TALLOC_FREE(smb_fname_stream);
 603         TALLOC_FREE(smb_fname_base);
 604         return ret;
 605 }
 606
 607 static int streams_depot_unlink(vfs_handle_struct *handle,
 608                                 const struct smb_filename *smb_fname)
 609 {
 610         struct smb_filename *smb_fname_base = NULL;
 611         NTSTATUS status;
 612         int ret = -1;
 613
 614         DEBUG(10, ("streams_depot_unlink called for %s\n",
 615                    smb_fname_str_dbg(smb_fname)));
 616
 617         /* If there is a valid stream, just unlink the stream and return. */
 618         if (is_ntfs_stream_smb_fname(smb_fname) &&
 619             !is_ntfs_default_stream_smb_fname(smb_fname)) {
 620                 struct smb_filename *smb_fname_stream = NULL;
 621
 622                 status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
 623                                           false);
 624                 if (!NT_STATUS_IS_OK(status)) {
 625                         errno = map_errno_from_nt_status(status);
 626                         return -1;
 627                 }
 628
 629                 ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname_stream);
 630
 631                 TALLOC_FREE(smb_fname_stream);
 632                 return ret;
 633         }
 634
 635         /*
 636          * We potentially need to delete the per-inode streams directory
 637          */
 638
 639         status = create_synthetic_smb_fname(talloc_tos(), smb_fname->base_name,
 640                                             NULL, NULL, &smb_fname_base);
 641         if (!NT_STATUS_IS_OK(status)) {
 642                 errno = map_errno_from_nt_status(status);
 643                 return -1;
 644         }
 645
 646         if (lp_posix_pathnames()) {
 647                 ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_base);
 648         } else {
 649                 ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 650         }
 651
 652         if (ret == -1) {
 653                 TALLOC_FREE(smb_fname_base);
 654                 return -1;
 655         }
 656
 657         if (smb_fname_base->st.st_ex_nlink == 1) {
 658                 char *dirname = stream_dir(handle, smb_fname_base,
 659                                            &smb_fname_base->st, false);
 660
 661                 if (dirname != NULL) {
 662                         SMB_VFS_NEXT_RMDIR(handle, dirname);
 663                 }
 664                 TALLOC_FREE(dirname);
 665         }
 666
 667         ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname);
 668
 669         TALLOC_FREE(smb_fname_base);
 670         return ret;
 671 }
 672
 673 static int streams_depot_rmdir(vfs_handle_struct *handle, const char *path)
 674 {
 675         struct smb_filename *smb_fname_base = NULL;
 676         NTSTATUS status;
 677         int ret = -1;
 678
 679         DEBUG(10, ("streams_depot_rmdir called for %s\n", path));
 680
 681         /*
 682          * We potentially need to delete the per-inode streams directory
 683          */
 684
 685         status = create_synthetic_smb_fname(talloc_tos(), path,
 686                                             NULL, NULL, &smb_fname_base);
 687         if (!NT_STATUS_IS_OK(status)) {
 688                 errno = map_errno_from_nt_status(status);
 689                 return -1;
 690         }
 691
 692         if (lp_posix_pathnames()) {
 693                 ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_base);
 694         } else {
 695                 ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 696         }
 697
 698         if (ret == -1) {
 699                 TALLOC_FREE(smb_fname_base);
 700                 return -1;
 701         }
 702
 703         if (smb_fname_base->st.st_ex_nlink == 2) {
 704                 char *dirname = stream_dir(handle, smb_fname_base,
 705                                            &smb_fname_base->st, false);
 706
 707                 if (dirname != NULL) {
 708                         SMB_VFS_NEXT_RMDIR(handle, dirname);
 709                 }
 710                 TALLOC_FREE(dirname);
 711         }
 712
 713         ret = SMB_VFS_NEXT_RMDIR(handle, path);
 714
 715         TALLOC_FREE(smb_fname_base);
 716         return ret;
 717 }
 718
 719 static int streams_depot_rename(vfs_handle_struct *handle,
 720                                 const struct smb_filename *smb_fname_src,
 721                                 const struct smb_filename *smb_fname_dst)
 722 {
 723         struct smb_filename *smb_fname_src_stream = NULL;
 724         struct smb_filename *smb_fname_dst_stream = NULL;
 725         bool src_is_stream, dst_is_stream;
 726         NTSTATUS status;
 727         int ret = -1;
 728
 729         DEBUG(10, ("streams_depot_rename called for %s => %s\n",
 730                    smb_fname_str_dbg(smb_fname_src),
 731                    smb_fname_str_dbg(smb_fname_dst)));
 732
 733         src_is_stream = is_ntfs_stream_smb_fname(smb_fname_src);
 734         dst_is_stream = is_ntfs_stream_smb_fname(smb_fname_dst);
 735
 736         if (!src_is_stream && !dst_is_stream) {
 737                 return SMB_VFS_NEXT_RENAME(handle, smb_fname_src,
 738                                            smb_fname_dst);
 739         }
 740
 741         /* for now don't allow renames from or to the default stream */
 742         if (is_ntfs_default_stream_smb_fname(smb_fname_src) ||
 743             is_ntfs_default_stream_smb_fname(smb_fname_dst)) {
 744                 errno = ENOSYS;
 745                 goto done;
 746         }
 747
 748         status = stream_smb_fname(handle, smb_fname_src, &smb_fname_src_stream,
 749                                   false);
 750         if (!NT_STATUS_IS_OK(status)) {
 751                 errno = map_errno_from_nt_status(status);
 752                 goto done;
 753         }
 754
 755         status = stream_smb_fname(handle, smb_fname_dst,
 756                                   &smb_fname_dst_stream, false);
 757         if (!NT_STATUS_IS_OK(status)) {
 758                 errno = map_errno_from_nt_status(status);
 759                 goto done;
 760         }
 761
 762         ret = SMB_VFS_NEXT_RENAME(handle, smb_fname_src_stream,
 763                                   smb_fname_dst_stream);
 764
 765 done:
 766         TALLOC_FREE(smb_fname_src_stream);
 767         TALLOC_FREE(smb_fname_dst_stream);
 768         return ret;
 769 }
 770
 771 static bool add_one_stream(TALLOC_CTX *mem_ctx, unsigned int *num_streams,
 772                            struct stream_struct **streams,
 773                            const char *name, off_t size,
 774                            off_t alloc_size)
 775 {
 776         struct stream_struct *tmp;
 777
 778         tmp = talloc_realloc(mem_ctx, *streams, struct stream_struct,
 779                                    (*num_streams)+1);
 780         if (tmp == NULL) {
 781                 return false;
 782         }
 783
 784         tmp[*num_streams].name = talloc_strdup(tmp, name);
 785         if (tmp[*num_streams].name == NULL) {
 786                 return false;
 787         }
 788
 789         tmp[*num_streams].size = size;
 790         tmp[*num_streams].alloc_size = alloc_size;
 791
 792         *streams = tmp;
 793         *num_streams += 1;
 794         return true;
 795 }
 796
 797 struct streaminfo_state {
 798         TALLOC_CTX *mem_ctx;
 799         vfs_handle_struct *handle;
 800         unsigned int num_streams;
 801         struct stream_struct *streams;
 802         NTSTATUS status;
 803 };
 804
 805 static bool collect_one_stream(const char *dirname,
 806                                const char *dirent,
 807                                void *private_data)
 808 {
 809         struct streaminfo_state *state =
 810                 (struct streaminfo_state *)private_data;
 811         struct smb_filename *smb_fname = NULL;
 812         char *sname = NULL;
 813         NTSTATUS status;
 814         bool ret;
 815
 816         sname = talloc_asprintf(talloc_tos(), "%s/%s", dirname, dirent);
 817         if (sname == NULL) {
 818                 state->status = NT_STATUS_NO_MEMORY;
 819                 ret = false;
 820                 goto out;
 821         }
 822
 823         status = create_synthetic_smb_fname(talloc_tos(), sname, NULL,
 824                                             NULL, &smb_fname);
 825         if (!NT_STATUS_IS_OK(status)) {
 826                 state->status = status;
 827                 ret = false;
 828                 goto out;
 829         }
 830
 831         if (SMB_VFS_NEXT_STAT(state->handle, smb_fname) == -1) {
 832                 DEBUG(10, ("Could not stat %s: %s\n", sname,
 833                            strerror(errno)));
 834                 ret = true;
 835                 goto out;
 836         }
 837
 838         if (!add_one_stream(state->mem_ctx,
 839                             &state->num_streams, &state->streams,
 840                             dirent, smb_fname->st.st_ex_size,
 841                             SMB_VFS_GET_ALLOC_SIZE(state->handle->conn, NULL,
 842                                                    &smb_fname->st))) {
 843                 state->status = NT_STATUS_NO_MEMORY;
 844                 ret = false;
 845                 goto out;
 846         }
 847
 848         ret = true;
 849  out:
 850         TALLOC_FREE(sname);
 851         TALLOC_FREE(smb_fname);
 852         return ret;
 853 }
 854
 855 static NTSTATUS streams_depot_streaminfo(vfs_handle_struct *handle,
 856                                          struct files_struct *fsp,
 857                                          const char *fname,
 858                                          TALLOC_CTX *mem_ctx,
 859                                          unsigned int *pnum_streams,
 860                                          struct stream_struct **pstreams)
 861 {
 862         struct smb_filename *smb_fname_base = NULL;
 863         int ret;
 864         NTSTATUS status;
 865         struct streaminfo_state state;
 866
 867         status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
 868                                             &smb_fname_base);
 869         if (!NT_STATUS_IS_OK(status)) {
 870                 return status;
 871         }
 872
 873         if ((fsp != NULL) && (fsp->fh->fd != -1)) {
 874                 ret = SMB_VFS_NEXT_FSTAT(handle, fsp, &smb_fname_base->st);
 875         }
 876         else {
 877                 if (lp_posix_pathnames()) {
 878                         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_base);
 879                 } else {
 880                         ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 881                 }
 882         }
 883
 884         if (ret == -1) {
 885                 status = map_nt_error_from_unix(errno);
 886                 goto out;
 887         }
 888
 889         state.streams = *pstreams;
 890         state.num_streams = *pnum_streams;
 891         state.mem_ctx = mem_ctx;
 892         state.handle = handle;
 893         state.status = NT_STATUS_OK;
 894
 895         status = walk_streams(handle, smb_fname_base, NULL, collect_one_stream,
 896                               &state);
 897
 898         if (!NT_STATUS_IS_OK(status)) {
 899                 TALLOC_FREE(state.streams);
 900                 goto out;
 901         }
 902
 903         if (!NT_STATUS_IS_OK(state.status)) {
 904                 TALLOC_FREE(state.streams);
 905                 status = state.status;
 906                 goto out;
 907         }
 908
 909         *pnum_streams = state.num_streams;
 910         *pstreams = state.streams;
 911         status = SMB_VFS_NEXT_STREAMINFO(handle, fsp, fname, mem_ctx, pnum_streams, pstreams);
 912
 913  out:
 914         TALLOC_FREE(smb_fname_base);
 915         return status;
 916 }
 917
 918 static uint32_t streams_depot_fs_capabilities(struct vfs_handle_struct *handle,
 919                         enum timestamp_set_resolution *p_ts_res)
 920 {
 921         return SMB_VFS_NEXT_FS_CAPABILITIES(handle, p_ts_res) | FILE_NAMED_STREAMS;
 922 }
 923
 924 static struct vfs_fn_pointers vfs_streams_depot_fns = {
 925         .fs_capabilities_fn = streams_depot_fs_capabilities,
 926         .open_fn = streams_depot_open,
 927         .stat_fn = streams_depot_stat,
 928         .lstat_fn = streams_depot_lstat,
 929         .unlink_fn = streams_depot_unlink,
 930         .rmdir_fn = streams_depot_rmdir,
 931         .rename_fn = streams_depot_rename,
 932         .streaminfo_fn = streams_depot_streaminfo,
 933 };
 934
 935 NTSTATUS vfs_streams_depot_init(void);
 936 NTSTATUS vfs_streams_depot_init(void)
 937 {
 938         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "streams_depot",
 939                                 &vfs_streams_depot_fns);
 940 }