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,
  71                         const struct smb_filename *smb_fname)
  72 {
  73         char buf;
  74
  75         DEBUG(10, ("file_is_valid (%s) called\n", smb_fname->base_name));
  76
  77         if (SMB_VFS_GETXATTR(handle->conn, smb_fname, SAMBA_XATTR_MARKER,
  78                                   &buf, sizeof(buf)) != sizeof(buf)) {
  79                 DEBUG(10, ("GETXATTR failed: %s\n", strerror(errno)));
  80                 return false;
  81         }
  82
  83         if (buf != '1') {
  84                 DEBUG(10, ("got wrong buffer content: '%c'\n", buf));
  85                 return false;
  86         }
  87
  88         return true;
  89 }
  90
  91 static bool mark_file_valid(vfs_handle_struct *handle,
  92                                 const struct smb_filename *smb_fname)
  93 {
  94         char buf = '1';
  95         int ret;
  96
  97         DEBUG(10, ("marking file %s as valid\n", smb_fname->base_name));
  98
  99         ret = SMB_VFS_SETXATTR(handle->conn, smb_fname, SAMBA_XATTR_MARKER,
 100                                     &buf, sizeof(buf), 0);
 101
 102         if (ret == -1) {
 103                 DEBUG(10, ("SETXATTR failed: %s\n", strerror(errno)));
 104                 return false;
 105         }
 106
 107         return true;
 108 }
 109
 110 /**
 111  * Given an smb_filename, determine the stream directory using the file's
 112  * base_name.
 113  */
 114 static char *stream_dir(vfs_handle_struct *handle,
 115                         const struct smb_filename *smb_fname,
 116                         const SMB_STRUCT_STAT *base_sbuf, bool create_it)
 117 {
 118         uint32_t hash;
 119         struct smb_filename *smb_fname_hash = NULL;
 120         char *result = NULL;
 121         SMB_STRUCT_STAT base_sbuf_tmp;
 122         uint8_t first, second;
 123         char *tmp;
 124         char *id_hex;
 125         struct file_id id;
 126         uint8_t id_buf[16];
 127         bool check_valid;
 128         char *rootdir = NULL;
 129         struct smb_filename *rootdir_fname = NULL;
 130         struct smb_filename *tmp_fname = NULL;
 131
 132         check_valid = lp_parm_bool(SNUM(handle->conn),
 133                       "streams_depot", "check_valid", true);
 134
 135         tmp = talloc_asprintf(talloc_tos(), "%s/.streams",
 136                 handle->conn->connectpath);
 137
 138         if (tmp == NULL) {
 139                 errno = ENOMEM;
 140                 goto fail;
 141         }
 142
 143         rootdir = lp_parm_talloc_string(talloc_tos(),
 144                 SNUM(handle->conn), "streams_depot", "directory",
 145                 tmp);
 146         if (rootdir == NULL) {
 147                 errno = ENOMEM;
 148                 goto fail;
 149         }
 150
 151         rootdir_fname = synthetic_smb_fname(talloc_tos(),
 152                                         rootdir,
 153                                         NULL,
 154                                         NULL,
 155                                         smb_fname->flags);
 156         if (rootdir_fname == NULL) {
 157                 errno = ENOMEM;
 158                 goto fail;
 159         }
 160
 161         /* Stat the base file if it hasn't already been done. */
 162         if (base_sbuf == NULL) {
 163                 struct smb_filename *smb_fname_base;
 164
 165                 smb_fname_base = synthetic_smb_fname(
 166                                         talloc_tos(),
 167                                         smb_fname->base_name,
 168                                         NULL,
 169                                         NULL,
 170                                         smb_fname->flags);
 171                 if (smb_fname_base == NULL) {
 172                         errno = ENOMEM;
 173                         goto fail;
 174                 }
 175                 if (SMB_VFS_NEXT_STAT(handle, smb_fname_base) == -1) {
 176                         TALLOC_FREE(smb_fname_base);
 177                         goto fail;
 178                 }
 179                 base_sbuf_tmp = smb_fname_base->st;
 180                 TALLOC_FREE(smb_fname_base);
 181         } else {
 182                 base_sbuf_tmp = *base_sbuf;
 183         }
 184
 185         id = SMB_VFS_FILE_ID_CREATE(handle->conn, &base_sbuf_tmp);
 186
 187         push_file_id_16((char *)id_buf, &id);
 188
 189         hash = hash_fn(data_blob_const(id_buf, sizeof(id_buf)));
 190
 191         first = hash & 0xff;
 192         second = (hash >> 8) & 0xff;
 193
 194         id_hex = hex_encode_talloc(talloc_tos(), id_buf, sizeof(id_buf));
 195
 196         if (id_hex == NULL) {
 197                 errno = ENOMEM;
 198                 goto fail;
 199         }
 200
 201         result = talloc_asprintf(talloc_tos(), "%s/%2.2X/%2.2X/%s", rootdir,
 202                                  first, second, id_hex);
 203
 204         TALLOC_FREE(id_hex);
 205
 206         if (result == NULL) {
 207                 errno = ENOMEM;
 208                 return NULL;
 209         }
 210
 211         smb_fname_hash = synthetic_smb_fname(talloc_tos(),
 212                                         result,
 213                                         NULL,
 214                                         NULL,
 215                                         smb_fname->flags);
 216         if (smb_fname_hash == NULL) {
 217                 errno = ENOMEM;
 218                 goto fail;
 219         }
 220
 221         if (SMB_VFS_NEXT_STAT(handle, smb_fname_hash) == 0) {
 222                 struct smb_filename *smb_fname_new = NULL;
 223                 char *newname;
 224                 bool delete_lost;
 225
 226                 if (!S_ISDIR(smb_fname_hash->st.st_ex_mode)) {
 227                         errno = EINVAL;
 228                         goto fail;
 229                 }
 230
 231                 if (!check_valid ||
 232                     file_is_valid(handle, smb_fname)) {
 233                         return result;
 234                 }
 235
 236                 /*
 237                  * Someone has recreated a file under an existing inode
 238                  * without deleting the streams directory.
 239                  * Move it away or remove if streams_depot:delete_lost is set.
 240                  */
 241
 242         again:
 243                 delete_lost = lp_parm_bool(SNUM(handle->conn), "streams_depot",
 244                                            "delete_lost", false);
 245
 246                 if (delete_lost) {
 247                         DEBUG(3, ("Someone has recreated a file under an "
 248                               "existing inode. Removing: %s\n",
 249                               smb_fname_hash->base_name));
 250                         recursive_rmdir(talloc_tos(), handle->conn,
 251                                         smb_fname_hash);
 252                         SMB_VFS_NEXT_RMDIR(handle, smb_fname_hash);
 253                 } else {
 254                         newname = talloc_asprintf(talloc_tos(), "lost-%lu",
 255                                                   random());
 256                         DEBUG(3, ("Someone has recreated a file under an "
 257                               "existing inode. Renaming: %s to: %s\n",
 258                               smb_fname_hash->base_name,
 259                               newname));
 260                         if (newname == NULL) {
 261                                 errno = ENOMEM;
 262                                 goto fail;
 263                         }
 264
 265                         smb_fname_new = synthetic_smb_fname(
 266                                                 talloc_tos(),
 267                                                 newname,
 268                                                 NULL,
 269                                                 NULL,
 270                                                 smb_fname->flags);
 271                         TALLOC_FREE(newname);
 272                         if (smb_fname_new == NULL) {
 273                                 errno = ENOMEM;
 274                                 goto fail;
 275                         }
 276
 277                         if (SMB_VFS_NEXT_RENAME(handle, smb_fname_hash,
 278                                                 smb_fname_new) == -1) {
 279                                 TALLOC_FREE(smb_fname_new);
 280                                 if ((errno == EEXIST) || (errno == ENOTEMPTY)) {
 281                                         goto again;
 282                                 }
 283                                 goto fail;
 284                         }
 285
 286                         TALLOC_FREE(smb_fname_new);
 287                 }
 288         }
 289
 290         if (!create_it) {
 291                 errno = ENOENT;
 292                 goto fail;
 293         }
 294
 295         if ((SMB_VFS_NEXT_MKDIR(handle, rootdir_fname, 0755) != 0)
 296             && (errno != EEXIST)) {
 297                 goto fail;
 298         }
 299
 300         tmp = talloc_asprintf(result, "%s/%2.2X", rootdir, first);
 301         if (tmp == NULL) {
 302                 errno = ENOMEM;
 303                 goto fail;
 304         }
 305
 306         tmp_fname = synthetic_smb_fname(talloc_tos(),
 307                                         tmp,
 308                                         NULL,
 309                                         NULL,
 310                                         smb_fname->flags);
 311         if (tmp_fname == NULL) {
 312                 errno = ENOMEM;
 313                 goto fail;
 314         }
 315
 316         if ((SMB_VFS_NEXT_MKDIR(handle, tmp_fname, 0755) != 0)
 317             && (errno != EEXIST)) {
 318                 goto fail;
 319         }
 320
 321         TALLOC_FREE(tmp);
 322         TALLOC_FREE(tmp_fname);
 323
 324         tmp = talloc_asprintf(result, "%s/%2.2X/%2.2X", rootdir, first,
 325                               second);
 326         if (tmp == NULL) {
 327                 errno = ENOMEM;
 328                 goto fail;
 329         }
 330
 331         tmp_fname = synthetic_smb_fname(talloc_tos(),
 332                                         tmp,
 333                                         NULL,
 334                                         NULL,
 335                                         smb_fname->flags);
 336         if (tmp_fname == NULL) {
 337                 errno = ENOMEM;
 338                 goto fail;
 339         }
 340
 341         if ((SMB_VFS_NEXT_MKDIR(handle, tmp_fname, 0755) != 0)
 342             && (errno != EEXIST)) {
 343                 goto fail;
 344         }
 345
 346         TALLOC_FREE(tmp);
 347         TALLOC_FREE(tmp_fname);
 348
 349         /* smb_fname_hash is the struct smb_filename version of 'result' */
 350         if ((SMB_VFS_NEXT_MKDIR(handle, smb_fname_hash, 0755) != 0)
 351             && (errno != EEXIST)) {
 352                 goto fail;
 353         }
 354
 355         if (check_valid && !mark_file_valid(handle, smb_fname)) {
 356                 goto fail;
 357         }
 358
 359         TALLOC_FREE(rootdir_fname);
 360         TALLOC_FREE(rootdir);
 361         TALLOC_FREE(tmp_fname);
 362         TALLOC_FREE(smb_fname_hash);
 363         return result;
 364
 365  fail:
 366         TALLOC_FREE(rootdir_fname);
 367         TALLOC_FREE(rootdir);
 368         TALLOC_FREE(tmp_fname);
 369         TALLOC_FREE(smb_fname_hash);
 370         TALLOC_FREE(result);
 371         return NULL;
 372 }
 373 /**
 374  * Given a stream name, populate smb_fname_out with the actual location of the
 375  * stream.
 376  */
 377 static NTSTATUS stream_smb_fname(vfs_handle_struct *handle,
 378                                  const struct smb_filename *smb_fname,
 379                                  struct smb_filename **smb_fname_out,
 380                                  bool create_dir)
 381 {
 382         char *dirname, *stream_fname;
 383         const char *stype;
 384         NTSTATUS status;
 385
 386         *smb_fname_out = NULL;
 387
 388         stype = strchr_m(smb_fname->stream_name + 1, ':');
 389
 390         if (stype) {
 391                 if (strcasecmp_m(stype, ":$DATA") != 0) {
 392                         return NT_STATUS_INVALID_PARAMETER;
 393                 }
 394         }
 395
 396         dirname = stream_dir(handle, smb_fname, NULL, create_dir);
 397
 398         if (dirname == NULL) {
 399                 status = map_nt_error_from_unix(errno);
 400                 goto fail;
 401         }
 402
 403         stream_fname = talloc_asprintf(talloc_tos(), "%s/%s", dirname,
 404                                        smb_fname->stream_name);
 405
 406         if (stream_fname == NULL) {
 407                 status = NT_STATUS_NO_MEMORY;
 408                 goto fail;
 409         }
 410
 411         if (stype == NULL) {
 412                 /* Append an explicit stream type if one wasn't specified. */
 413                 stream_fname = talloc_asprintf(talloc_tos(), "%s:$DATA",
 414                                                stream_fname);
 415                 if (stream_fname == NULL) {
 416                         status = NT_STATUS_NO_MEMORY;
 417                         goto fail;
 418                 }
 419         } else {
 420                 /* Normalize the stream type to upercase. */
 421                 if (!strupper_m(strrchr_m(stream_fname, ':') + 1)) {
 422                         status = NT_STATUS_INVALID_PARAMETER;
 423                         goto fail;
 424                 }
 425         }
 426
 427         DEBUG(10, ("stream filename = %s\n", stream_fname));
 428
 429         /* Create an smb_filename with stream_name == NULL. */
 430         *smb_fname_out = synthetic_smb_fname(talloc_tos(),
 431                                         stream_fname,
 432                                         NULL,
 433                                         NULL,
 434                                         smb_fname->flags);
 435         if (*smb_fname_out == NULL) {
 436                 return NT_STATUS_NO_MEMORY;
 437         }
 438
 439         return NT_STATUS_OK;
 440
 441  fail:
 442         DEBUG(5, ("stream_name failed: %s\n", strerror(errno)));
 443         TALLOC_FREE(*smb_fname_out);
 444         return status;
 445 }
 446
 447 static NTSTATUS walk_streams(vfs_handle_struct *handle,
 448                              struct smb_filename *smb_fname_base,
 449                              char **pdirname,
 450                              bool (*fn)(const char *dirname,
 451                                         const char *dirent,
 452                                         void *private_data),
 453                              void *private_data)
 454 {
 455         char *dirname;
 456         struct smb_filename *dir_smb_fname = NULL;
 457         DIR *dirhandle = NULL;
 458         const char *dirent = NULL;
 459         char *talloced = NULL;
 460
 461         dirname = stream_dir(handle, smb_fname_base, &smb_fname_base->st,
 462                              false);
 463
 464         if (dirname == NULL) {
 465                 if (errno == ENOENT) {
 466                         /*
 467                          * no stream around
 468                          */
 469                         return NT_STATUS_OK;
 470                 }
 471                 return map_nt_error_from_unix(errno);
 472         }
 473
 474         DEBUG(10, ("walk_streams: dirname=%s\n", dirname));
 475
 476         dir_smb_fname = synthetic_smb_fname(talloc_tos(),
 477                                         dirname,
 478                                         NULL,
 479                                         NULL,
 480                                         smb_fname_base->flags);
 481         if (dir_smb_fname == NULL) {
 482                 TALLOC_FREE(dirname);
 483                 return NT_STATUS_NO_MEMORY;
 484         }
 485
 486         dirhandle = SMB_VFS_NEXT_OPENDIR(handle, dir_smb_fname, NULL, 0);
 487
 488         TALLOC_FREE(dir_smb_fname);
 489
 490         if (dirhandle == NULL) {
 491                 TALLOC_FREE(dirname);
 492                 return map_nt_error_from_unix(errno);
 493         }
 494
 495         while ((dirent = vfs_readdirname(handle->conn, dirhandle, NULL,
 496                                          &talloced)) != NULL) {
 497
 498                 if (ISDOT(dirent) || ISDOTDOT(dirent)) {
 499                         TALLOC_FREE(talloced);
 500                         continue;
 501                 }
 502
 503                 DEBUG(10, ("walk_streams: dirent=%s\n", dirent));
 504
 505                 if (!fn(dirname, dirent, private_data)) {
 506                         TALLOC_FREE(talloced);
 507                         break;
 508                 }
 509                 TALLOC_FREE(talloced);
 510         }
 511
 512         SMB_VFS_NEXT_CLOSEDIR(handle, dirhandle);
 513
 514         if (pdirname != NULL) {
 515                 *pdirname = dirname;
 516         }
 517         else {
 518                 TALLOC_FREE(dirname);
 519         }
 520
 521         return NT_STATUS_OK;
 522 }
 523
 524 /**
 525  * Helper to stat/lstat the base file of an smb_fname. This will actually
 526  * fills in the stat struct in smb_filename.
 527  */
 528 static int streams_depot_stat_base(vfs_handle_struct *handle,
 529                                    struct smb_filename *smb_fname,
 530                                    bool follow_links)
 531 {
 532         char *tmp_stream_name;
 533         int result;
 534
 535         tmp_stream_name = smb_fname->stream_name;
 536         smb_fname->stream_name = NULL;
 537         if (follow_links) {
 538                 result = SMB_VFS_NEXT_STAT(handle, smb_fname);
 539         } else {
 540                 result = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 541         }
 542         smb_fname->stream_name = tmp_stream_name;
 543         return result;
 544 }
 545
 546 static int streams_depot_stat(vfs_handle_struct *handle,
 547                               struct smb_filename *smb_fname)
 548 {
 549         struct smb_filename *smb_fname_stream = NULL;
 550         NTSTATUS status;
 551         int ret = -1;
 552
 553         DEBUG(10, ("streams_depot_stat called for [%s]\n",
 554                    smb_fname_str_dbg(smb_fname)));
 555
 556         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 557                 return SMB_VFS_NEXT_STAT(handle, smb_fname);
 558         }
 559
 560         /* If the default stream is requested, just stat the base file. */
 561         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 562                 return streams_depot_stat_base(handle, smb_fname, true);
 563         }
 564
 565         /* Stat the actual stream now. */
 566         status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
 567                                   false);
 568         if (!NT_STATUS_IS_OK(status)) {
 569                 ret = -1;
 570                 errno = map_errno_from_nt_status(status);
 571                 goto done;
 572         }
 573
 574         ret = SMB_VFS_NEXT_STAT(handle, smb_fname_stream);
 575
 576         /* Update the original smb_fname with the stat info. */
 577         smb_fname->st = smb_fname_stream->st;
 578  done:
 579         TALLOC_FREE(smb_fname_stream);
 580         return ret;
 581 }
 582
 583
 584
 585 static int streams_depot_lstat(vfs_handle_struct *handle,
 586                                struct smb_filename *smb_fname)
 587 {
 588         struct smb_filename *smb_fname_stream = NULL;
 589         NTSTATUS status;
 590         int ret = -1;
 591
 592         DEBUG(10, ("streams_depot_lstat called for [%s]\n",
 593                    smb_fname_str_dbg(smb_fname)));
 594
 595         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 596                 return SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 597         }
 598
 599         /* If the default stream is requested, just stat the base file. */
 600         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 601                 return streams_depot_stat_base(handle, smb_fname, false);
 602         }
 603
 604         /* Stat the actual stream now. */
 605         status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
 606                                   false);
 607         if (!NT_STATUS_IS_OK(status)) {
 608                 ret = -1;
 609                 errno = map_errno_from_nt_status(status);
 610                 goto done;
 611         }
 612
 613         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_stream);
 614
 615  done:
 616         TALLOC_FREE(smb_fname_stream);
 617         return ret;
 618 }
 619
 620 static int streams_depot_open(vfs_handle_struct *handle,
 621                               struct smb_filename *smb_fname,
 622                               files_struct *fsp, int flags, mode_t mode)
 623 {
 624         struct smb_filename *smb_fname_stream = NULL;
 625         struct smb_filename *smb_fname_base = NULL;
 626         NTSTATUS status;
 627         int ret = -1;
 628
 629         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 630                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 631         }
 632
 633         /* If the default stream is requested, just open the base file. */
 634         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 635                 char *tmp_stream_name;
 636
 637                 tmp_stream_name = smb_fname->stream_name;
 638                 smb_fname->stream_name = NULL;
 639                 ret = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 640                 smb_fname->stream_name = tmp_stream_name;
 641
 642                 return ret;
 643         }
 644
 645         /* Ensure the base file still exists. */
 646         smb_fname_base = synthetic_smb_fname(talloc_tos(),
 647                                         smb_fname->base_name,
 648                                         NULL,
 649                                         NULL,
 650                                         smb_fname->flags);
 651         if (smb_fname_base == NULL) {
 652                 ret = -1;
 653                 errno = ENOMEM;
 654                 goto done;
 655         }
 656
 657         ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 658         if (ret == -1) {
 659                 goto done;
 660         }
 661
 662         /* Determine the stream name, and then open it. */
 663         status = stream_smb_fname(handle, smb_fname, &smb_fname_stream, true);
 664         if (!NT_STATUS_IS_OK(status)) {
 665                 ret = -1;
 666                 errno = map_errno_from_nt_status(status);
 667                 goto done;
 668         }
 669
 670         ret = SMB_VFS_NEXT_OPEN(handle, smb_fname_stream, fsp, flags, mode);
 671
 672  done:
 673         TALLOC_FREE(smb_fname_stream);
 674         TALLOC_FREE(smb_fname_base);
 675         return ret;
 676 }
 677
 678 static int streams_depot_unlink(vfs_handle_struct *handle,
 679                                 const struct smb_filename *smb_fname)
 680 {
 681         struct smb_filename *smb_fname_base = NULL;
 682         int ret = -1;
 683
 684         DEBUG(10, ("streams_depot_unlink called for %s\n",
 685                    smb_fname_str_dbg(smb_fname)));
 686
 687         /* If there is a valid stream, just unlink the stream and return. */
 688         if (is_ntfs_stream_smb_fname(smb_fname) &&
 689             !is_ntfs_default_stream_smb_fname(smb_fname)) {
 690                 struct smb_filename *smb_fname_stream = NULL;
 691                 NTSTATUS status;
 692
 693                 status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
 694                                           false);
 695                 if (!NT_STATUS_IS_OK(status)) {
 696                         errno = map_errno_from_nt_status(status);
 697                         return -1;
 698                 }
 699
 700                 ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname_stream);
 701
 702                 TALLOC_FREE(smb_fname_stream);
 703                 return ret;
 704         }
 705
 706         /*
 707          * We potentially need to delete the per-inode streams directory
 708          */
 709
 710         smb_fname_base = synthetic_smb_fname(talloc_tos(),
 711                                         smb_fname->base_name,
 712                                         NULL,
 713                                         NULL,
 714                                         smb_fname->flags);
 715         if (smb_fname_base == NULL) {
 716                 errno = ENOMEM;
 717                 return -1;
 718         }
 719
 720         if (smb_fname_base->flags & SMB_FILENAME_POSIX_PATH) {
 721                 ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_base);
 722         } else {
 723                 ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 724         }
 725
 726         if (ret == -1) {
 727                 TALLOC_FREE(smb_fname_base);
 728                 return -1;
 729         }
 730
 731         /*
 732          * We know the unlink should succeed as the ACL
 733          * check is already done in the caller. Remove the
 734          * file *after* the streams.
 735          */
 736         {
 737                 char *dirname = stream_dir(handle, smb_fname_base,
 738                                            &smb_fname_base->st, false);
 739
 740                 if (dirname != NULL) {
 741                         struct smb_filename *smb_fname_dir =
 742                                 synthetic_smb_fname(talloc_tos(),
 743                                                 dirname,
 744                                                 NULL,
 745                                                 NULL,
 746                                                 smb_fname->flags);
 747                         if (smb_fname_dir == NULL) {
 748                                 TALLOC_FREE(smb_fname_base);
 749                                 TALLOC_FREE(dirname);
 750                                 errno = ENOMEM;
 751                                 return -1;
 752                         }
 753                         SMB_VFS_NEXT_RMDIR(handle, smb_fname_dir);
 754                         TALLOC_FREE(smb_fname_dir);
 755                 }
 756                 TALLOC_FREE(dirname);
 757         }
 758
 759         ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname);
 760         TALLOC_FREE(smb_fname_base);
 761         return ret;
 762 }
 763
 764 static int streams_depot_rmdir(vfs_handle_struct *handle,
 765                                 const struct smb_filename *smb_fname)
 766 {
 767         struct smb_filename *smb_fname_base = NULL;
 768         int ret = -1;
 769
 770         DEBUG(10, ("streams_depot_rmdir called for %s\n",
 771                 smb_fname->base_name));
 772
 773         /*
 774          * We potentially need to delete the per-inode streams directory
 775          */
 776
 777         smb_fname_base = synthetic_smb_fname(talloc_tos(),
 778                                 smb_fname->base_name,
 779                                 NULL,
 780                                 NULL,
 781                                 smb_fname->flags);
 782         if (smb_fname_base == NULL) {
 783                 errno = ENOMEM;
 784                 return -1;
 785         }
 786
 787         if (smb_fname_base->flags & SMB_FILENAME_POSIX_PATH) {
 788                 ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_base);
 789         } else {
 790                 ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 791         }
 792
 793         if (ret == -1) {
 794                 TALLOC_FREE(smb_fname_base);
 795                 return -1;
 796         }
 797
 798         /*
 799          * We know the rmdir should succeed as the ACL
 800          * check is already done in the caller. Remove the
 801          * directory *after* the streams.
 802          */
 803         {
 804                 char *dirname = stream_dir(handle, smb_fname_base,
 805                                            &smb_fname_base->st, false);
 806
 807                 if (dirname != NULL) {
 808                         struct smb_filename *smb_fname_dir =
 809                                 synthetic_smb_fname(talloc_tos(),
 810                                                 dirname,
 811                                                 NULL,
 812                                                 NULL,
 813                                                 smb_fname->flags);
 814                         if (smb_fname_dir == NULL) {
 815                                 TALLOC_FREE(smb_fname_base);
 816                                 TALLOC_FREE(dirname);
 817                                 errno = ENOMEM;
 818                                 return -1;
 819                         }
 820                         SMB_VFS_NEXT_RMDIR(handle, smb_fname_dir);
 821                         TALLOC_FREE(smb_fname_dir);
 822                 }
 823                 TALLOC_FREE(dirname);
 824         }
 825
 826         ret = SMB_VFS_NEXT_RMDIR(handle, smb_fname_base);
 827         TALLOC_FREE(smb_fname_base);
 828         return ret;
 829 }
 830
 831 static int streams_depot_rename(vfs_handle_struct *handle,
 832                                 const struct smb_filename *smb_fname_src,
 833                                 const struct smb_filename *smb_fname_dst)
 834 {
 835         struct smb_filename *smb_fname_src_stream = NULL;
 836         struct smb_filename *smb_fname_dst_stream = NULL;
 837         bool src_is_stream, dst_is_stream;
 838         NTSTATUS status;
 839         int ret = -1;
 840
 841         DEBUG(10, ("streams_depot_rename called for %s => %s\n",
 842                    smb_fname_str_dbg(smb_fname_src),
 843                    smb_fname_str_dbg(smb_fname_dst)));
 844
 845         src_is_stream = is_ntfs_stream_smb_fname(smb_fname_src);
 846         dst_is_stream = is_ntfs_stream_smb_fname(smb_fname_dst);
 847
 848         if (!src_is_stream && !dst_is_stream) {
 849                 return SMB_VFS_NEXT_RENAME(handle, smb_fname_src,
 850                                            smb_fname_dst);
 851         }
 852
 853         /* for now don't allow renames from or to the default stream */
 854         if (is_ntfs_default_stream_smb_fname(smb_fname_src) ||
 855             is_ntfs_default_stream_smb_fname(smb_fname_dst)) {
 856                 errno = ENOSYS;
 857                 goto done;
 858         }
 859
 860         status = stream_smb_fname(handle, smb_fname_src, &smb_fname_src_stream,
 861                                   false);
 862         if (!NT_STATUS_IS_OK(status)) {
 863                 errno = map_errno_from_nt_status(status);
 864                 goto done;
 865         }
 866
 867         status = stream_smb_fname(handle, smb_fname_dst,
 868                                   &smb_fname_dst_stream, false);
 869         if (!NT_STATUS_IS_OK(status)) {
 870                 errno = map_errno_from_nt_status(status);
 871                 goto done;
 872         }
 873
 874         ret = SMB_VFS_NEXT_RENAME(handle, smb_fname_src_stream,
 875                                   smb_fname_dst_stream);
 876
 877 done:
 878         TALLOC_FREE(smb_fname_src_stream);
 879         TALLOC_FREE(smb_fname_dst_stream);
 880         return ret;
 881 }
 882
 883 static bool add_one_stream(TALLOC_CTX *mem_ctx, unsigned int *num_streams,
 884                            struct stream_struct **streams,
 885                            const char *name, off_t size,
 886                            off_t alloc_size)
 887 {
 888         struct stream_struct *tmp;
 889
 890         tmp = talloc_realloc(mem_ctx, *streams, struct stream_struct,
 891                                    (*num_streams)+1);
 892         if (tmp == NULL) {
 893                 return false;
 894         }
 895
 896         tmp[*num_streams].name = talloc_strdup(tmp, name);
 897         if (tmp[*num_streams].name == NULL) {
 898                 return false;
 899         }
 900
 901         tmp[*num_streams].size = size;
 902         tmp[*num_streams].alloc_size = alloc_size;
 903
 904         *streams = tmp;
 905         *num_streams += 1;
 906         return true;
 907 }
 908
 909 struct streaminfo_state {
 910         TALLOC_CTX *mem_ctx;
 911         vfs_handle_struct *handle;
 912         unsigned int num_streams;
 913         struct stream_struct *streams;
 914         NTSTATUS status;
 915 };
 916
 917 static bool collect_one_stream(const char *dirname,
 918                                const char *dirent,
 919                                void *private_data)
 920 {
 921         struct streaminfo_state *state =
 922                 (struct streaminfo_state *)private_data;
 923         struct smb_filename *smb_fname = NULL;
 924         char *sname = NULL;
 925         bool ret;
 926
 927         sname = talloc_asprintf(talloc_tos(), "%s/%s", dirname, dirent);
 928         if (sname == NULL) {
 929                 state->status = NT_STATUS_NO_MEMORY;
 930                 ret = false;
 931                 goto out;
 932         }
 933
 934         smb_fname = synthetic_smb_fname(talloc_tos(), sname, NULL, NULL, 0);
 935         if (smb_fname == NULL) {
 936                 state->status = NT_STATUS_NO_MEMORY;
 937                 ret = false;
 938                 goto out;
 939         }
 940
 941         if (SMB_VFS_NEXT_STAT(state->handle, smb_fname) == -1) {
 942                 DEBUG(10, ("Could not stat %s: %s\n", sname,
 943                            strerror(errno)));
 944                 ret = true;
 945                 goto out;
 946         }
 947
 948         if (!add_one_stream(state->mem_ctx,
 949                             &state->num_streams, &state->streams,
 950                             dirent, smb_fname->st.st_ex_size,
 951                             SMB_VFS_GET_ALLOC_SIZE(state->handle->conn, NULL,
 952                                                    &smb_fname->st))) {
 953                 state->status = NT_STATUS_NO_MEMORY;
 954                 ret = false;
 955                 goto out;
 956         }
 957
 958         ret = true;
 959  out:
 960         TALLOC_FREE(sname);
 961         TALLOC_FREE(smb_fname);
 962         return ret;
 963 }
 964
 965 static NTSTATUS streams_depot_streaminfo(vfs_handle_struct *handle,
 966                                          struct files_struct *fsp,
 967                                          const struct smb_filename *smb_fname,
 968                                          TALLOC_CTX *mem_ctx,
 969                                          unsigned int *pnum_streams,
 970                                          struct stream_struct **pstreams)
 971 {
 972         struct smb_filename *smb_fname_base = NULL;
 973         int ret;
 974         NTSTATUS status;
 975         struct streaminfo_state state;
 976
 977         smb_fname_base = synthetic_smb_fname(talloc_tos(),
 978                                         smb_fname->base_name,
 979                                         NULL,
 980                                         NULL,
 981                                         smb_fname->flags);
 982         if (smb_fname_base == NULL) {
 983                 return NT_STATUS_NO_MEMORY;
 984         }
 985
 986         if ((fsp != NULL) && (fsp->fh->fd != -1)) {
 987                 ret = SMB_VFS_NEXT_FSTAT(handle, fsp, &smb_fname_base->st);
 988         }
 989         else {
 990                 if (smb_fname_base->flags & SMB_FILENAME_POSIX_PATH) {
 991                         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_base);
 992                 } else {
 993                         ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 994                 }
 995         }
 996
 997         if (ret == -1) {
 998                 status = map_nt_error_from_unix(errno);
 999                 goto out;
1000         }
1001
1002         state.streams = *pstreams;
1003         state.num_streams = *pnum_streams;
1004         state.mem_ctx = mem_ctx;
1005         state.handle = handle;
1006         state.status = NT_STATUS_OK;
1007
1008         if (S_ISLNK(smb_fname_base->st.st_ex_mode)) {
1009                 /*
1010                  * Currently we do't have SMB_VFS_LLISTXATTR
1011                  * inside the VFS which means there's no way
1012                  * to cope with a symlink when lp_posix_pathnames().
1013                  * returns true. For now ignore links.
1014                  * FIXME - by adding SMB_VFS_LLISTXATTR. JRA.
1015                  */
1016                 status = NT_STATUS_OK;
1017         } else {
1018                 status = walk_streams(handle, smb_fname_base, NULL, collect_one_stream,
1019                               &state);
1020         }
1021
1022         if (!NT_STATUS_IS_OK(status)) {
1023                 TALLOC_FREE(state.streams);
1024                 goto out;
1025         }
1026
1027         if (!NT_STATUS_IS_OK(state.status)) {
1028                 TALLOC_FREE(state.streams);
1029                 status = state.status;
1030                 goto out;
1031         }
1032
1033         *pnum_streams = state.num_streams;
1034         *pstreams = state.streams;
1035         status = SMB_VFS_NEXT_STREAMINFO(handle,
1036                                 fsp,
1037                                 smb_fname_base,
1038                                 mem_ctx,
1039                                 pnum_streams,
1040                                 pstreams);
1041
1042  out:
1043         TALLOC_FREE(smb_fname_base);
1044         return status;
1045 }
1046
1047 static uint32_t streams_depot_fs_capabilities(struct vfs_handle_struct *handle,
1048                         enum timestamp_set_resolution *p_ts_res)
1049 {
1050         return SMB_VFS_NEXT_FS_CAPABILITIES(handle, p_ts_res) | FILE_NAMED_STREAMS;
1051 }
1052
1053 static struct vfs_fn_pointers vfs_streams_depot_fns = {
1054         .fs_capabilities_fn = streams_depot_fs_capabilities,
1055         .open_fn = streams_depot_open,
1056         .stat_fn = streams_depot_stat,
1057         .lstat_fn = streams_depot_lstat,
1058         .unlink_fn = streams_depot_unlink,
1059         .rmdir_fn = streams_depot_rmdir,
1060         .rename_fn = streams_depot_rename,
1061         .streaminfo_fn = streams_depot_streaminfo,
1062 };
1063
1064 NTSTATUS vfs_streams_depot_init(TALLOC_CTX *);
1065 NTSTATUS vfs_streams_depot_init(TALLOC_CTX *ctx)
1066 {
1067         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "streams_depot",
1068                                 &vfs_streams_depot_fns);
1069 }