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_t id_buf[16];
 125         bool check_valid;
 126         char *rootdir = NULL;
 127         struct smb_filename *rootdir_fname = NULL;
 128         struct smb_filename *tmp_fname = NULL;
 129
 130         check_valid = lp_parm_bool(SNUM(handle->conn),
 131                       "streams_depot", "check_valid", true);
 132
 133         tmp = talloc_asprintf(talloc_tos(), "%s/.streams",
 134                 handle->conn->connectpath);
 135
 136         if (tmp == NULL) {
 137                 errno = ENOMEM;
 138                 goto fail;
 139         }
 140
 141         rootdir = lp_parm_talloc_string(talloc_tos(),
 142                 SNUM(handle->conn), "streams_depot", "directory",
 143                 tmp);
 144         if (rootdir == NULL) {
 145                 errno = ENOMEM;
 146                 goto fail;
 147         }
 148
 149         rootdir_fname = synthetic_smb_fname(talloc_tos(),
 150                                         rootdir,
 151                                         NULL,
 152                                         NULL,
 153                                         smb_fname->flags);
 154         if (rootdir_fname == NULL) {
 155                 errno = ENOMEM;
 156                 goto fail;
 157         }
 158
 159         /* Stat the base file if it hasn't already been done. */
 160         if (base_sbuf == NULL) {
 161                 struct smb_filename *smb_fname_base;
 162
 163                 smb_fname_base = synthetic_smb_fname(
 164                                         talloc_tos(),
 165                                         smb_fname->base_name,
 166                                         NULL,
 167                                         NULL,
 168                                         smb_fname->flags);
 169                 if (smb_fname_base == NULL) {
 170                         errno = ENOMEM;
 171                         goto fail;
 172                 }
 173                 if (SMB_VFS_NEXT_STAT(handle, smb_fname_base) == -1) {
 174                         TALLOC_FREE(smb_fname_base);
 175                         goto fail;
 176                 }
 177                 base_sbuf_tmp = smb_fname_base->st;
 178                 TALLOC_FREE(smb_fname_base);
 179         } else {
 180                 base_sbuf_tmp = *base_sbuf;
 181         }
 182
 183         id = SMB_VFS_FILE_ID_CREATE(handle->conn, &base_sbuf_tmp);
 184
 185         push_file_id_16((char *)id_buf, &id);
 186
 187         hash = hash_fn(data_blob_const(id_buf, sizeof(id_buf)));
 188
 189         first = hash & 0xff;
 190         second = (hash >> 8) & 0xff;
 191
 192         id_hex = hex_encode_talloc(talloc_tos(), id_buf, sizeof(id_buf));
 193
 194         if (id_hex == NULL) {
 195                 errno = ENOMEM;
 196                 goto fail;
 197         }
 198
 199         result = talloc_asprintf(talloc_tos(), "%s/%2.2X/%2.2X/%s", rootdir,
 200                                  first, second, id_hex);
 201
 202         TALLOC_FREE(id_hex);
 203
 204         if (result == NULL) {
 205                 errno = ENOMEM;
 206                 return NULL;
 207         }
 208
 209         smb_fname_hash = synthetic_smb_fname(talloc_tos(),
 210                                         result,
 211                                         NULL,
 212                                         NULL,
 213                                         smb_fname->flags);
 214         if (smb_fname_hash == NULL) {
 215                 errno = ENOMEM;
 216                 goto fail;
 217         }
 218
 219         if (SMB_VFS_NEXT_STAT(handle, smb_fname_hash) == 0) {
 220                 struct smb_filename *smb_fname_new = NULL;
 221                 char *newname;
 222                 bool delete_lost;
 223
 224                 if (!S_ISDIR(smb_fname_hash->st.st_ex_mode)) {
 225                         errno = EINVAL;
 226                         goto fail;
 227                 }
 228
 229                 if (!check_valid ||
 230                     file_is_valid(handle, smb_fname->base_name)) {
 231                         return result;
 232                 }
 233
 234                 /*
 235                  * Someone has recreated a file under an existing inode
 236                  * without deleting the streams directory.
 237                  * Move it away or remove if streams_depot:delete_lost is set.
 238                  */
 239
 240         again:
 241                 delete_lost = lp_parm_bool(SNUM(handle->conn), "streams_depot",
 242                                            "delete_lost", false);
 243
 244                 if (delete_lost) {
 245                         DEBUG(3, ("Someone has recreated a file under an "
 246                               "existing inode. Removing: %s\n",
 247                               smb_fname_hash->base_name));
 248                         recursive_rmdir(talloc_tos(), handle->conn,
 249                                         smb_fname_hash);
 250                         SMB_VFS_NEXT_RMDIR(handle, smb_fname_hash);
 251                 } else {
 252                         newname = talloc_asprintf(talloc_tos(), "lost-%lu",
 253                                                   random());
 254                         DEBUG(3, ("Someone has recreated a file under an "
 255                               "existing inode. Renaming: %s to: %s\n",
 256                               smb_fname_hash->base_name,
 257                               newname));
 258                         if (newname == NULL) {
 259                                 errno = ENOMEM;
 260                                 goto fail;
 261                         }
 262
 263                         smb_fname_new = synthetic_smb_fname(
 264                                                 talloc_tos(),
 265                                                 newname,
 266                                                 NULL,
 267                                                 NULL,
 268                                                 smb_fname->flags);
 269                         TALLOC_FREE(newname);
 270                         if (smb_fname_new == NULL) {
 271                                 errno = ENOMEM;
 272                                 goto fail;
 273                         }
 274
 275                         if (SMB_VFS_NEXT_RENAME(handle, smb_fname_hash,
 276                                                 smb_fname_new) == -1) {
 277                                 TALLOC_FREE(smb_fname_new);
 278                                 if ((errno == EEXIST) || (errno == ENOTEMPTY)) {
 279                                         goto again;
 280                                 }
 281                                 goto fail;
 282                         }
 283
 284                         TALLOC_FREE(smb_fname_new);
 285                 }
 286         }
 287
 288         if (!create_it) {
 289                 errno = ENOENT;
 290                 goto fail;
 291         }
 292
 293         if ((SMB_VFS_NEXT_MKDIR(handle, rootdir_fname, 0755) != 0)
 294             && (errno != EEXIST)) {
 295                 goto fail;
 296         }
 297
 298         tmp = talloc_asprintf(result, "%s/%2.2X", rootdir, first);
 299         if (tmp == NULL) {
 300                 errno = ENOMEM;
 301                 goto fail;
 302         }
 303
 304         tmp_fname = synthetic_smb_fname(talloc_tos(),
 305                                         tmp,
 306                                         NULL,
 307                                         NULL,
 308                                         smb_fname->flags);
 309         if (tmp_fname == NULL) {
 310                 errno = ENOMEM;
 311                 goto fail;
 312         }
 313
 314         if ((SMB_VFS_NEXT_MKDIR(handle, tmp_fname, 0755) != 0)
 315             && (errno != EEXIST)) {
 316                 goto fail;
 317         }
 318
 319         TALLOC_FREE(tmp);
 320         TALLOC_FREE(tmp_fname);
 321
 322         tmp = talloc_asprintf(result, "%s/%2.2X/%2.2X", rootdir, first,
 323                               second);
 324         if (tmp == NULL) {
 325                 errno = ENOMEM;
 326                 goto fail;
 327         }
 328
 329         tmp_fname = synthetic_smb_fname(talloc_tos(),
 330                                         tmp,
 331                                         NULL,
 332                                         NULL,
 333                                         smb_fname->flags);
 334         if (tmp_fname == NULL) {
 335                 errno = ENOMEM;
 336                 goto fail;
 337         }
 338
 339         if ((SMB_VFS_NEXT_MKDIR(handle, tmp_fname, 0755) != 0)
 340             && (errno != EEXIST)) {
 341                 goto fail;
 342         }
 343
 344         TALLOC_FREE(tmp);
 345         TALLOC_FREE(tmp_fname);
 346
 347         /* smb_fname_hash is the struct smb_filename version of 'result' */
 348         if ((SMB_VFS_NEXT_MKDIR(handle, smb_fname_hash, 0755) != 0)
 349             && (errno != EEXIST)) {
 350                 goto fail;
 351         }
 352
 353         if (check_valid && !mark_file_valid(handle, smb_fname->base_name)) {
 354                 goto fail;
 355         }
 356
 357         TALLOC_FREE(rootdir_fname);
 358         TALLOC_FREE(rootdir);
 359         TALLOC_FREE(tmp_fname);
 360         TALLOC_FREE(smb_fname_hash);
 361         return result;
 362
 363  fail:
 364         TALLOC_FREE(rootdir_fname);
 365         TALLOC_FREE(rootdir);
 366         TALLOC_FREE(tmp_fname);
 367         TALLOC_FREE(smb_fname_hash);
 368         TALLOC_FREE(result);
 369         return NULL;
 370 }
 371 /**
 372  * Given a stream name, populate smb_fname_out with the actual location of the
 373  * stream.
 374  */
 375 static NTSTATUS stream_smb_fname(vfs_handle_struct *handle,
 376                                  const struct smb_filename *smb_fname,
 377                                  struct smb_filename **smb_fname_out,
 378                                  bool create_dir)
 379 {
 380         char *dirname, *stream_fname;
 381         const char *stype;
 382         NTSTATUS status;
 383
 384         *smb_fname_out = NULL;
 385
 386         stype = strchr_m(smb_fname->stream_name + 1, ':');
 387
 388         if (stype) {
 389                 if (strcasecmp_m(stype, ":$DATA") != 0) {
 390                         return NT_STATUS_INVALID_PARAMETER;
 391                 }
 392         }
 393
 394         dirname = stream_dir(handle, smb_fname, NULL, create_dir);
 395
 396         if (dirname == NULL) {
 397                 status = map_nt_error_from_unix(errno);
 398                 goto fail;
 399         }
 400
 401         stream_fname = talloc_asprintf(talloc_tos(), "%s/%s", dirname,
 402                                        smb_fname->stream_name);
 403
 404         if (stream_fname == NULL) {
 405                 status = NT_STATUS_NO_MEMORY;
 406                 goto fail;
 407         }
 408
 409         if (stype == NULL) {
 410                 /* Append an explicit stream type if one wasn't specified. */
 411                 stream_fname = talloc_asprintf(talloc_tos(), "%s:$DATA",
 412                                                stream_fname);
 413                 if (stream_fname == NULL) {
 414                         status = NT_STATUS_NO_MEMORY;
 415                         goto fail;
 416                 }
 417         } else {
 418                 /* Normalize the stream type to upercase. */
 419                 if (!strupper_m(strrchr_m(stream_fname, ':') + 1)) {
 420                         status = NT_STATUS_INVALID_PARAMETER;
 421                         goto fail;
 422                 }
 423         }
 424
 425         DEBUG(10, ("stream filename = %s\n", stream_fname));
 426
 427         /* Create an smb_filename with stream_name == NULL. */
 428         *smb_fname_out = synthetic_smb_fname(talloc_tos(),
 429                                         stream_fname,
 430                                         NULL,
 431                                         NULL,
 432                                         smb_fname->flags);
 433         if (*smb_fname_out == NULL) {
 434                 return NT_STATUS_NO_MEMORY;
 435         }
 436
 437         return NT_STATUS_OK;
 438
 439  fail:
 440         DEBUG(5, ("stream_name failed: %s\n", strerror(errno)));
 441         TALLOC_FREE(*smb_fname_out);
 442         return status;
 443 }
 444
 445 static NTSTATUS walk_streams(vfs_handle_struct *handle,
 446                              struct smb_filename *smb_fname_base,
 447                              char **pdirname,
 448                              bool (*fn)(const char *dirname,
 449                                         const char *dirent,
 450                                         void *private_data),
 451                              void *private_data)
 452 {
 453         char *dirname;
 454         struct smb_filename *dir_smb_fname = NULL;
 455         DIR *dirhandle = NULL;
 456         const char *dirent = NULL;
 457         char *talloced = NULL;
 458
 459         dirname = stream_dir(handle, smb_fname_base, &smb_fname_base->st,
 460                              false);
 461
 462         if (dirname == NULL) {
 463                 if (errno == ENOENT) {
 464                         /*
 465                          * no stream around
 466                          */
 467                         return NT_STATUS_OK;
 468                 }
 469                 return map_nt_error_from_unix(errno);
 470         }
 471
 472         DEBUG(10, ("walk_streams: dirname=%s\n", dirname));
 473
 474         dir_smb_fname = synthetic_smb_fname(talloc_tos(),
 475                                         dirname,
 476                                         NULL,
 477                                         NULL,
 478                                         smb_fname_base->flags);
 479         if (dir_smb_fname == NULL) {
 480                 TALLOC_FREE(dirname);
 481                 return NT_STATUS_NO_MEMORY;
 482         }
 483
 484         dirhandle = SMB_VFS_NEXT_OPENDIR(handle, dir_smb_fname, NULL, 0);
 485
 486         TALLOC_FREE(dir_smb_fname);
 487
 488         if (dirhandle == NULL) {
 489                 TALLOC_FREE(dirname);
 490                 return map_nt_error_from_unix(errno);
 491         }
 492
 493         while ((dirent = vfs_readdirname(handle->conn, dirhandle, NULL,
 494                                          &talloced)) != NULL) {
 495
 496                 if (ISDOT(dirent) || ISDOTDOT(dirent)) {
 497                         TALLOC_FREE(talloced);
 498                         continue;
 499                 }
 500
 501                 DEBUG(10, ("walk_streams: dirent=%s\n", dirent));
 502
 503                 if (!fn(dirname, dirent, private_data)) {
 504                         TALLOC_FREE(talloced);
 505                         break;
 506                 }
 507                 TALLOC_FREE(talloced);
 508         }
 509
 510         SMB_VFS_NEXT_CLOSEDIR(handle, dirhandle);
 511
 512         if (pdirname != NULL) {
 513                 *pdirname = dirname;
 514         }
 515         else {
 516                 TALLOC_FREE(dirname);
 517         }
 518
 519         return NT_STATUS_OK;
 520 }
 521
 522 /**
 523  * Helper to stat/lstat the base file of an smb_fname. This will actually
 524  * fills in the stat struct in smb_filename.
 525  */
 526 static int streams_depot_stat_base(vfs_handle_struct *handle,
 527                                    struct smb_filename *smb_fname,
 528                                    bool follow_links)
 529 {
 530         char *tmp_stream_name;
 531         int result;
 532
 533         tmp_stream_name = smb_fname->stream_name;
 534         smb_fname->stream_name = NULL;
 535         if (follow_links) {
 536                 result = SMB_VFS_NEXT_STAT(handle, smb_fname);
 537         } else {
 538                 result = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 539         }
 540         smb_fname->stream_name = tmp_stream_name;
 541         return result;
 542 }
 543
 544 static int streams_depot_stat(vfs_handle_struct *handle,
 545                               struct smb_filename *smb_fname)
 546 {
 547         struct smb_filename *smb_fname_stream = NULL;
 548         NTSTATUS status;
 549         int ret = -1;
 550
 551         DEBUG(10, ("streams_depot_stat called for [%s]\n",
 552                    smb_fname_str_dbg(smb_fname)));
 553
 554         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 555                 return SMB_VFS_NEXT_STAT(handle, smb_fname);
 556         }
 557
 558         /* If the default stream is requested, just stat the base file. */
 559         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 560                 return streams_depot_stat_base(handle, smb_fname, true);
 561         }
 562
 563         /* Stat the actual stream now. */
 564         status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
 565                                   false);
 566         if (!NT_STATUS_IS_OK(status)) {
 567                 ret = -1;
 568                 errno = map_errno_from_nt_status(status);
 569                 goto done;
 570         }
 571
 572         ret = SMB_VFS_NEXT_STAT(handle, smb_fname_stream);
 573
 574         /* Update the original smb_fname with the stat info. */
 575         smb_fname->st = smb_fname_stream->st;
 576  done:
 577         TALLOC_FREE(smb_fname_stream);
 578         return ret;
 579 }
 580
 581
 582
 583 static int streams_depot_lstat(vfs_handle_struct *handle,
 584                                struct smb_filename *smb_fname)
 585 {
 586         struct smb_filename *smb_fname_stream = NULL;
 587         NTSTATUS status;
 588         int ret = -1;
 589
 590         DEBUG(10, ("streams_depot_lstat called for [%s]\n",
 591                    smb_fname_str_dbg(smb_fname)));
 592
 593         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 594                 return SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 595         }
 596
 597         /* If the default stream is requested, just stat the base file. */
 598         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 599                 return streams_depot_stat_base(handle, smb_fname, false);
 600         }
 601
 602         /* Stat the actual stream now. */
 603         status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
 604                                   false);
 605         if (!NT_STATUS_IS_OK(status)) {
 606                 ret = -1;
 607                 errno = map_errno_from_nt_status(status);
 608                 goto done;
 609         }
 610
 611         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_stream);
 612
 613  done:
 614         TALLOC_FREE(smb_fname_stream);
 615         return ret;
 616 }
 617
 618 static int streams_depot_open(vfs_handle_struct *handle,
 619                               struct smb_filename *smb_fname,
 620                               files_struct *fsp, int flags, mode_t mode)
 621 {
 622         struct smb_filename *smb_fname_stream = NULL;
 623         struct smb_filename *smb_fname_base = NULL;
 624         NTSTATUS status;
 625         int ret = -1;
 626
 627         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 628                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 629         }
 630
 631         /* If the default stream is requested, just open the base file. */
 632         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 633                 char *tmp_stream_name;
 634
 635                 tmp_stream_name = smb_fname->stream_name;
 636                 smb_fname->stream_name = NULL;
 637                 ret = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 638                 smb_fname->stream_name = tmp_stream_name;
 639
 640                 return ret;
 641         }
 642
 643         /* Ensure the base file still exists. */
 644         smb_fname_base = synthetic_smb_fname(talloc_tos(),
 645                                         smb_fname->base_name,
 646                                         NULL,
 647                                         NULL,
 648                                         smb_fname->flags);
 649         if (smb_fname_base == NULL) {
 650                 ret = -1;
 651                 errno = ENOMEM;
 652                 goto done;
 653         }
 654
 655         ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 656         if (ret == -1) {
 657                 goto done;
 658         }
 659
 660         /* Determine the stream name, and then open it. */
 661         status = stream_smb_fname(handle, smb_fname, &smb_fname_stream, true);
 662         if (!NT_STATUS_IS_OK(status)) {
 663                 ret = -1;
 664                 errno = map_errno_from_nt_status(status);
 665                 goto done;
 666         }
 667
 668         ret = SMB_VFS_NEXT_OPEN(handle, smb_fname_stream, fsp, flags, mode);
 669
 670  done:
 671         TALLOC_FREE(smb_fname_stream);
 672         TALLOC_FREE(smb_fname_base);
 673         return ret;
 674 }
 675
 676 static int streams_depot_unlink(vfs_handle_struct *handle,
 677                                 const struct smb_filename *smb_fname)
 678 {
 679         struct smb_filename *smb_fname_base = NULL;
 680         int ret = -1;
 681
 682         DEBUG(10, ("streams_depot_unlink called for %s\n",
 683                    smb_fname_str_dbg(smb_fname)));
 684
 685         /* If there is a valid stream, just unlink the stream and return. */
 686         if (is_ntfs_stream_smb_fname(smb_fname) &&
 687             !is_ntfs_default_stream_smb_fname(smb_fname)) {
 688                 struct smb_filename *smb_fname_stream = NULL;
 689                 NTSTATUS status;
 690
 691                 status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
 692                                           false);
 693                 if (!NT_STATUS_IS_OK(status)) {
 694                         errno = map_errno_from_nt_status(status);
 695                         return -1;
 696                 }
 697
 698                 ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname_stream);
 699
 700                 TALLOC_FREE(smb_fname_stream);
 701                 return ret;
 702         }
 703
 704         /*
 705          * We potentially need to delete the per-inode streams directory
 706          */
 707
 708         smb_fname_base = synthetic_smb_fname(talloc_tos(),
 709                                         smb_fname->base_name,
 710                                         NULL,
 711                                         NULL,
 712                                         smb_fname->flags);
 713         if (smb_fname_base == NULL) {
 714                 errno = ENOMEM;
 715                 return -1;
 716         }
 717
 718         if (smb_fname_base->flags & SMB_FILENAME_POSIX_PATH) {
 719                 ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_base);
 720         } else {
 721                 ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 722         }
 723
 724         if (ret == -1) {
 725                 TALLOC_FREE(smb_fname_base);
 726                 return -1;
 727         }
 728
 729         /*
 730          * We know the unlink should succeed as the ACL
 731          * check is already done in the caller. Remove the
 732          * file *after* the streams.
 733          */
 734         {
 735                 char *dirname = stream_dir(handle, smb_fname_base,
 736                                            &smb_fname_base->st, false);
 737
 738                 if (dirname != NULL) {
 739                         struct smb_filename *smb_fname_dir =
 740                                 synthetic_smb_fname(talloc_tos(),
 741                                                 dirname,
 742                                                 NULL,
 743                                                 NULL,
 744                                                 smb_fname->flags);
 745                         if (smb_fname_dir == NULL) {
 746                                 TALLOC_FREE(smb_fname_base);
 747                                 TALLOC_FREE(dirname);
 748                                 errno = ENOMEM;
 749                                 return -1;
 750                         }
 751                         SMB_VFS_NEXT_RMDIR(handle, smb_fname_dir);
 752                         TALLOC_FREE(smb_fname_dir);
 753                 }
 754                 TALLOC_FREE(dirname);
 755         }
 756
 757         ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname);
 758         TALLOC_FREE(smb_fname_base);
 759         return ret;
 760 }
 761
 762 static int streams_depot_rmdir(vfs_handle_struct *handle,
 763                                 const struct smb_filename *smb_fname)
 764 {
 765         struct smb_filename *smb_fname_base = NULL;
 766         int ret = -1;
 767
 768         DEBUG(10, ("streams_depot_rmdir called for %s\n",
 769                 smb_fname->base_name));
 770
 771         /*
 772          * We potentially need to delete the per-inode streams directory
 773          */
 774
 775         smb_fname_base = synthetic_smb_fname(talloc_tos(),
 776                                 smb_fname->base_name,
 777                                 NULL,
 778                                 NULL,
 779                                 smb_fname->flags);
 780         if (smb_fname_base == NULL) {
 781                 errno = ENOMEM;
 782                 return -1;
 783         }
 784
 785         if (smb_fname_base->flags & SMB_FILENAME_POSIX_PATH) {
 786                 ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_base);
 787         } else {
 788                 ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 789         }
 790
 791         if (ret == -1) {
 792                 TALLOC_FREE(smb_fname_base);
 793                 return -1;
 794         }
 795
 796         /*
 797          * We know the rmdir should succeed as the ACL
 798          * check is already done in the caller. Remove the
 799          * directory *after* the streams.
 800          */
 801         {
 802                 char *dirname = stream_dir(handle, smb_fname_base,
 803                                            &smb_fname_base->st, false);
 804
 805                 if (dirname != NULL) {
 806                         struct smb_filename *smb_fname_dir =
 807                                 synthetic_smb_fname(talloc_tos(),
 808                                                 dirname,
 809                                                 NULL,
 810                                                 NULL,
 811                                                 smb_fname->flags);
 812                         if (smb_fname_dir == NULL) {
 813                                 TALLOC_FREE(smb_fname_base);
 814                                 TALLOC_FREE(dirname);
 815                                 errno = ENOMEM;
 816                                 return -1;
 817                         }
 818                         SMB_VFS_NEXT_RMDIR(handle, smb_fname_dir);
 819                         TALLOC_FREE(smb_fname_dir);
 820                 }
 821                 TALLOC_FREE(dirname);
 822         }
 823
 824         ret = SMB_VFS_NEXT_RMDIR(handle, smb_fname_base);
 825         TALLOC_FREE(smb_fname_base);
 826         return ret;
 827 }
 828
 829 static int streams_depot_rename(vfs_handle_struct *handle,
 830                                 const struct smb_filename *smb_fname_src,
 831                                 const struct smb_filename *smb_fname_dst)
 832 {
 833         struct smb_filename *smb_fname_src_stream = NULL;
 834         struct smb_filename *smb_fname_dst_stream = NULL;
 835         bool src_is_stream, dst_is_stream;
 836         NTSTATUS status;
 837         int ret = -1;
 838
 839         DEBUG(10, ("streams_depot_rename called for %s => %s\n",
 840                    smb_fname_str_dbg(smb_fname_src),
 841                    smb_fname_str_dbg(smb_fname_dst)));
 842
 843         src_is_stream = is_ntfs_stream_smb_fname(smb_fname_src);
 844         dst_is_stream = is_ntfs_stream_smb_fname(smb_fname_dst);
 845
 846         if (!src_is_stream && !dst_is_stream) {
 847                 return SMB_VFS_NEXT_RENAME(handle, smb_fname_src,
 848                                            smb_fname_dst);
 849         }
 850
 851         /* for now don't allow renames from or to the default stream */
 852         if (is_ntfs_default_stream_smb_fname(smb_fname_src) ||
 853             is_ntfs_default_stream_smb_fname(smb_fname_dst)) {
 854                 errno = ENOSYS;
 855                 goto done;
 856         }
 857
 858         status = stream_smb_fname(handle, smb_fname_src, &smb_fname_src_stream,
 859                                   false);
 860         if (!NT_STATUS_IS_OK(status)) {
 861                 errno = map_errno_from_nt_status(status);
 862                 goto done;
 863         }
 864
 865         status = stream_smb_fname(handle, smb_fname_dst,
 866                                   &smb_fname_dst_stream, false);
 867         if (!NT_STATUS_IS_OK(status)) {
 868                 errno = map_errno_from_nt_status(status);
 869                 goto done;
 870         }
 871
 872         ret = SMB_VFS_NEXT_RENAME(handle, smb_fname_src_stream,
 873                                   smb_fname_dst_stream);
 874
 875 done:
 876         TALLOC_FREE(smb_fname_src_stream);
 877         TALLOC_FREE(smb_fname_dst_stream);
 878         return ret;
 879 }
 880
 881 static bool add_one_stream(TALLOC_CTX *mem_ctx, unsigned int *num_streams,
 882                            struct stream_struct **streams,
 883                            const char *name, off_t size,
 884                            off_t alloc_size)
 885 {
 886         struct stream_struct *tmp;
 887
 888         tmp = talloc_realloc(mem_ctx, *streams, struct stream_struct,
 889                                    (*num_streams)+1);
 890         if (tmp == NULL) {
 891                 return false;
 892         }
 893
 894         tmp[*num_streams].name = talloc_strdup(tmp, name);
 895         if (tmp[*num_streams].name == NULL) {
 896                 return false;
 897         }
 898
 899         tmp[*num_streams].size = size;
 900         tmp[*num_streams].alloc_size = alloc_size;
 901
 902         *streams = tmp;
 903         *num_streams += 1;
 904         return true;
 905 }
 906
 907 struct streaminfo_state {
 908         TALLOC_CTX *mem_ctx;
 909         vfs_handle_struct *handle;
 910         unsigned int num_streams;
 911         struct stream_struct *streams;
 912         NTSTATUS status;
 913 };
 914
 915 static bool collect_one_stream(const char *dirname,
 916                                const char *dirent,
 917                                void *private_data)
 918 {
 919         struct streaminfo_state *state =
 920                 (struct streaminfo_state *)private_data;
 921         struct smb_filename *smb_fname = NULL;
 922         char *sname = NULL;
 923         bool ret;
 924
 925         sname = talloc_asprintf(talloc_tos(), "%s/%s", dirname, dirent);
 926         if (sname == NULL) {
 927                 state->status = NT_STATUS_NO_MEMORY;
 928                 ret = false;
 929                 goto out;
 930         }
 931
 932         smb_fname = synthetic_smb_fname(talloc_tos(), sname, NULL, NULL, 0);
 933         if (smb_fname == NULL) {
 934                 state->status = NT_STATUS_NO_MEMORY;
 935                 ret = false;
 936                 goto out;
 937         }
 938
 939         if (SMB_VFS_NEXT_STAT(state->handle, smb_fname) == -1) {
 940                 DEBUG(10, ("Could not stat %s: %s\n", sname,
 941                            strerror(errno)));
 942                 ret = true;
 943                 goto out;
 944         }
 945
 946         if (!add_one_stream(state->mem_ctx,
 947                             &state->num_streams, &state->streams,
 948                             dirent, smb_fname->st.st_ex_size,
 949                             SMB_VFS_GET_ALLOC_SIZE(state->handle->conn, NULL,
 950                                                    &smb_fname->st))) {
 951                 state->status = NT_STATUS_NO_MEMORY;
 952                 ret = false;
 953                 goto out;
 954         }
 955
 956         ret = true;
 957  out:
 958         TALLOC_FREE(sname);
 959         TALLOC_FREE(smb_fname);
 960         return ret;
 961 }
 962
 963 static NTSTATUS streams_depot_streaminfo(vfs_handle_struct *handle,
 964                                          struct files_struct *fsp,
 965                                          const struct smb_filename *smb_fname,
 966                                          TALLOC_CTX *mem_ctx,
 967                                          unsigned int *pnum_streams,
 968                                          struct stream_struct **pstreams)
 969 {
 970         struct smb_filename *smb_fname_base = NULL;
 971         int ret;
 972         NTSTATUS status;
 973         struct streaminfo_state state;
 974
 975         smb_fname_base = synthetic_smb_fname(talloc_tos(),
 976                                         smb_fname->base_name,
 977                                         NULL,
 978                                         NULL,
 979                                         smb_fname->flags);
 980         if (smb_fname_base == NULL) {
 981                 return NT_STATUS_NO_MEMORY;
 982         }
 983
 984         if ((fsp != NULL) && (fsp->fh->fd != -1)) {
 985                 ret = SMB_VFS_NEXT_FSTAT(handle, fsp, &smb_fname_base->st);
 986         }
 987         else {
 988                 if (smb_fname_base->flags & SMB_FILENAME_POSIX_PATH) {
 989                         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_base);
 990                 } else {
 991                         ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 992                 }
 993         }
 994
 995         if (ret == -1) {
 996                 status = map_nt_error_from_unix(errno);
 997                 goto out;
 998         }
 999
1000         state.streams = *pstreams;
1001         state.num_streams = *pnum_streams;
1002         state.mem_ctx = mem_ctx;
1003         state.handle = handle;
1004         state.status = NT_STATUS_OK;
1005
1006         if (S_ISLNK(smb_fname_base->st.st_ex_mode)) {
1007                 /*
1008                  * Currently we do't have SMB_VFS_LLISTXATTR
1009                  * inside the VFS which means there's no way
1010                  * to cope with a symlink when lp_posix_pathnames().
1011                  * returns true. For now ignore links.
1012                  * FIXME - by adding SMB_VFS_LLISTXATTR. JRA.
1013                  */
1014                 status = NT_STATUS_OK;
1015         } else {
1016                 status = walk_streams(handle, smb_fname_base, NULL, collect_one_stream,
1017                               &state);
1018         }
1019
1020         if (!NT_STATUS_IS_OK(status)) {
1021                 TALLOC_FREE(state.streams);
1022                 goto out;
1023         }
1024
1025         if (!NT_STATUS_IS_OK(state.status)) {
1026                 TALLOC_FREE(state.streams);
1027                 status = state.status;
1028                 goto out;
1029         }
1030
1031         *pnum_streams = state.num_streams;
1032         *pstreams = state.streams;
1033         status = SMB_VFS_NEXT_STREAMINFO(handle,
1034                                 fsp,
1035                                 smb_fname_base,
1036                                 mem_ctx,
1037                                 pnum_streams,
1038                                 pstreams);
1039
1040  out:
1041         TALLOC_FREE(smb_fname_base);
1042         return status;
1043 }
1044
1045 static uint32_t streams_depot_fs_capabilities(struct vfs_handle_struct *handle,
1046                         enum timestamp_set_resolution *p_ts_res)
1047 {
1048         return SMB_VFS_NEXT_FS_CAPABILITIES(handle, p_ts_res) | FILE_NAMED_STREAMS;
1049 }
1050
1051 static struct vfs_fn_pointers vfs_streams_depot_fns = {
1052         .fs_capabilities_fn = streams_depot_fs_capabilities,
1053         .open_fn = streams_depot_open,
1054         .stat_fn = streams_depot_stat,
1055         .lstat_fn = streams_depot_lstat,
1056         .unlink_fn = streams_depot_unlink,
1057         .rmdir_fn = streams_depot_rmdir,
1058         .rename_fn = streams_depot_rename,
1059         .streaminfo_fn = streams_depot_streaminfo,
1060 };
1061
1062 NTSTATUS vfs_streams_depot_init(void);
1063 NTSTATUS vfs_streams_depot_init(void)
1064 {
1065         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "streams_depot",
1066                                 &vfs_streams_depot_fns);
1067 }