source3/modules/vfs_streams_depot.c

   1 /*
   2  * Store streams in a separate subdirectory
   3  *
   4  * Copyright (C) Volker Lendecke, 2007
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "includes.h"
  21
  22 #undef DBGC_CLASS
  23 #define DBGC_CLASS DBGC_VFS
  24
  25 /*
  26  * Excerpt from a mail from tridge:
  27  *
  28  * Volker, what I'm thinking of is this:
  29  * /mount-point/.streams/XX/YY/aaaa.bbbb/namedstream1
  30  * /mount-point/.streams/XX/YY/aaaa.bbbb/namedstream2
  31  *
  32  * where XX/YY is a 2 level hash based on the fsid/inode. "aaaa.bbbb"
  33  * is the fsid/inode. "namedstreamX" is a file named after the stream
  34  * name.
  35  */
  36
  37 static uint32_t hash_fn(DATA_BLOB key)
  38 {
  39         uint32_t value; /* Used to compute the hash value.  */
  40         uint32_t i;     /* Used to cycle through random values. */
  41
  42         /* Set the initial value from the key size. */
  43         for (value = 0x238F13AF * key.length, i=0; i < key.length; i++)
  44                 value = (value + (key.data[i] << (i*5 % 24)));
  45
  46         return (1103515243 * value + 12345);
  47 }
  48
  49 /*
  50  * With the hashing scheme based on the inode we need to protect against
  51  * streams showing up on files with re-used inodes. This can happen if we
  52  * create a stream directory from within Samba, and a local process or NFS
  53  * client deletes the file without deleting the streams directory. When the
  54  * inode is re-used and the stream directory is still around, the streams in
  55  * there would be show up as belonging to the new file.
  56  *
  57  * There are several workarounds for this, probably the easiest one is on
  58  * systems which have a true birthtime stat element: When the file has a later
  59  * birthtime than the streams directory, then we have to recreate the
  60  * directory.
  61  *
  62  * The other workaround is to somehow mark the file as generated by Samba with
  63  * something that a NFS client would not do. The closest one is a special
  64  * xattr value being set. On systems which do not support xattrs, it might be
  65  * an option to put in a special ACL entry for a non-existing group.
  66  */
  67
  68 #define SAMBA_XATTR_MARKER "user.SAMBA_STREAMS"
  69
  70 static bool file_is_valid(vfs_handle_struct *handle, const char *path,
  71                           bool check_valid)
  72 {
  73         char buf;
  74
  75         if (!check_valid) {
  76                 return true;
  77         }
  78
  79         DEBUG(10, ("file_is_valid (%s) called\n", path));
  80
  81         if (SMB_VFS_GETXATTR(handle->conn, path, SAMBA_XATTR_MARKER,
  82                                   &buf, sizeof(buf)) != sizeof(buf)) {
  83                 DEBUG(10, ("GETXATTR failed: %s\n", strerror(errno)));
  84                 return false;
  85         }
  86
  87         if (buf != '1') {
  88                 DEBUG(10, ("got wrong buffer content: '%c'\n", buf));
  89                 return false;
  90         }
  91
  92         return true;
  93 }
  94
  95 static bool mark_file_valid(vfs_handle_struct *handle, const char *path,
  96                             bool check_valid)
  97 {
  98         char buf = '1';
  99         int ret;
 100
 101         if (!check_valid) {
 102                 return true;
 103         }
 104
 105         DEBUG(10, ("marking file %s as valid\n", path));
 106
 107         ret = SMB_VFS_SETXATTR(handle->conn, path, SAMBA_XATTR_MARKER,
 108                                     &buf, sizeof(buf), 0);
 109
 110         if (ret == -1) {
 111                 DEBUG(10, ("SETXATTR failed: %s\n", strerror(errno)));
 112                 return false;
 113         }
 114
 115         return true;
 116 }
 117
 118 /**
 119  * Given an smb_filename, determine the stream directory using the file's
 120  * base_name.
 121  */
 122 static char *stream_dir(vfs_handle_struct *handle,
 123                         const struct smb_filename *smb_fname,
 124                         const SMB_STRUCT_STAT *base_sbuf, bool create_it)
 125 {
 126         uint32_t hash;
 127         struct smb_filename *smb_fname_hash = NULL;
 128         char *result = NULL;
 129         SMB_STRUCT_STAT base_sbuf_tmp;
 130         uint8_t first, second;
 131         char *tmp;
 132         char *id_hex;
 133         struct file_id id;
 134         uint8 id_buf[16];
 135         bool check_valid;
 136         const char *rootdir;
 137         NTSTATUS status;
 138
 139         check_valid = lp_parm_bool(SNUM(handle->conn),
 140                       "streams_depot", "check_valid", true);
 141
 142         tmp = talloc_asprintf(talloc_tos(), "%s/.streams", handle->conn->connectpath);
 143
 144         if (tmp == NULL) {
 145                 errno = ENOMEM;
 146                 goto fail;
 147         }
 148
 149         rootdir = lp_parm_const_string(
 150                 SNUM(handle->conn), "streams_depot", "directory",
 151                 tmp);
 152
 153         /* Stat the base file if it hasn't already been done. */
 154         if (base_sbuf == NULL) {
 155                 struct smb_filename *smb_fname_base = NULL;
 156
 157                 status = create_synthetic_smb_fname(talloc_tos(),
 158                                                     smb_fname->base_name,
 159                                                     NULL, NULL,
 160                                                     &smb_fname_base);
 161                 if (!NT_STATUS_IS_OK(status)) {
 162                         errno = map_errno_from_nt_status(status);
 163                         goto fail;
 164                 }
 165                 if (SMB_VFS_NEXT_STAT(handle, smb_fname_base) == -1) {
 166                         TALLOC_FREE(smb_fname_base);
 167                         goto fail;
 168                 }
 169                 base_sbuf_tmp = smb_fname_base->st;
 170                 TALLOC_FREE(smb_fname_base);
 171         } else {
 172                 base_sbuf_tmp = *base_sbuf;
 173         }
 174
 175         id = SMB_VFS_FILE_ID_CREATE(handle->conn, &base_sbuf_tmp);
 176
 177         push_file_id_16((char *)id_buf, &id);
 178
 179         hash = hash_fn(data_blob_const(id_buf, sizeof(id_buf)));
 180
 181         first = hash & 0xff;
 182         second = (hash >> 8) & 0xff;
 183
 184         id_hex = hex_encode_talloc(talloc_tos(), id_buf, sizeof(id_buf));
 185
 186         if (id_hex == NULL) {
 187                 errno = ENOMEM;
 188                 goto fail;
 189         }
 190
 191         result = talloc_asprintf(talloc_tos(), "%s/%2.2X/%2.2X/%s", rootdir,
 192                                  first, second, id_hex);
 193
 194         TALLOC_FREE(id_hex);
 195
 196         if (result == NULL) {
 197                 errno = ENOMEM;
 198                 return NULL;
 199         }
 200
 201         status = create_synthetic_smb_fname(talloc_tos(), result, NULL, NULL,
 202                                             &smb_fname_hash);
 203         if (!NT_STATUS_IS_OK(status)) {
 204                 errno = map_errno_from_nt_status(status);
 205                 goto fail;
 206         }
 207
 208         if (SMB_VFS_NEXT_STAT(handle, smb_fname_hash) == 0) {
 209                 struct smb_filename *smb_fname_new = NULL;
 210                 char *newname;
 211
 212                 if (!S_ISDIR(smb_fname_hash->st.st_ex_mode)) {
 213                         errno = EINVAL;
 214                         goto fail;
 215                 }
 216
 217                 if (file_is_valid(handle, smb_fname->base_name, check_valid)) {
 218                         return result;
 219                 }
 220
 221                 /*
 222                  * Someone has recreated a file under an existing inode
 223                  * without deleting the streams directory. For now, just move
 224                  * it away.
 225                  */
 226
 227         again:
 228                 newname = talloc_asprintf(talloc_tos(), "lost-%lu", random());
 229                 if (newname == NULL) {
 230                         errno = ENOMEM;
 231                         goto fail;
 232                 }
 233
 234                 status = create_synthetic_smb_fname(talloc_tos(), newname,
 235                                                     NULL, NULL,
 236                                                     &smb_fname_new);
 237                 TALLOC_FREE(newname);
 238                 if (!NT_STATUS_IS_OK(status)) {
 239                         errno = map_errno_from_nt_status(status);
 240                         goto fail;
 241                 }
 242
 243                 if (SMB_VFS_NEXT_RENAME(handle, smb_fname_hash,
 244                                         smb_fname_new) == -1) {
 245                         TALLOC_FREE(smb_fname_new);
 246                         if ((errno == EEXIST) || (errno == ENOTEMPTY)) {
 247                                 goto again;
 248                         }
 249                         goto fail;
 250                 }
 251
 252                 TALLOC_FREE(smb_fname_new);
 253         }
 254
 255         if (!create_it) {
 256                 errno = ENOENT;
 257                 goto fail;
 258         }
 259
 260         if ((SMB_VFS_NEXT_MKDIR(handle, rootdir, 0755) != 0)
 261             && (errno != EEXIST)) {
 262                 goto fail;
 263         }
 264
 265         tmp = talloc_asprintf(result, "%s/%2.2X", rootdir, first);
 266         if (tmp == NULL) {
 267                 errno = ENOMEM;
 268                 goto fail;
 269         }
 270
 271         if ((SMB_VFS_NEXT_MKDIR(handle, tmp, 0755) != 0)
 272             && (errno != EEXIST)) {
 273                 goto fail;
 274         }
 275
 276         TALLOC_FREE(tmp);
 277
 278         tmp = talloc_asprintf(result, "%s/%2.2X/%2.2X", rootdir, first,
 279                               second);
 280         if (tmp == NULL) {
 281                 errno = ENOMEM;
 282                 goto fail;
 283         }
 284
 285         if ((SMB_VFS_NEXT_MKDIR(handle, tmp, 0755) != 0)
 286             && (errno != EEXIST)) {
 287                 goto fail;
 288         }
 289
 290         TALLOC_FREE(tmp);
 291
 292         if ((SMB_VFS_NEXT_MKDIR(handle, result, 0755) != 0)
 293             && (errno != EEXIST)) {
 294                 goto fail;
 295         }
 296
 297         if (!mark_file_valid(handle, smb_fname->base_name, check_valid)) {
 298                 goto fail;
 299         }
 300
 301         TALLOC_FREE(smb_fname_hash);
 302         return result;
 303
 304  fail:
 305         TALLOC_FREE(smb_fname_hash);
 306         TALLOC_FREE(result);
 307         return NULL;
 308 }
 309 /**
 310  * Given a stream name, populate smb_fname_out with the actual location of the
 311  * stream.
 312  */
 313 static NTSTATUS stream_smb_fname(vfs_handle_struct *handle,
 314                                  const struct smb_filename *smb_fname,
 315                                  struct smb_filename **smb_fname_out,
 316                                  bool create_dir)
 317 {
 318         char *dirname, *stream_fname;
 319         const char *stype;
 320         NTSTATUS status;
 321
 322         *smb_fname_out = NULL;
 323
 324         dirname = stream_dir(handle, smb_fname, NULL, create_dir);
 325
 326         if (dirname == NULL) {
 327                 status = map_nt_error_from_unix(errno);
 328                 goto fail;
 329         }
 330
 331         stype = strchr_m(smb_fname->stream_name + 1, ':');
 332
 333         stream_fname = talloc_asprintf(talloc_tos(), "%s/%s", dirname,
 334                                        smb_fname->stream_name);
 335
 336         if (stream_fname == NULL) {
 337                 status = NT_STATUS_NO_MEMORY;
 338                 goto fail;
 339         }
 340
 341         if (stype == NULL) {
 342                 /* Append an explicit stream type if one wasn't specified. */
 343                 stream_fname = talloc_asprintf(talloc_tos(), "%s:$DATA",
 344                                                stream_fname);
 345                 if (stream_fname == NULL) {
 346                         status = NT_STATUS_NO_MEMORY;
 347                         goto fail;
 348                 }
 349         } else {
 350                 /* Normalize the stream type to upercase. */
 351                 strupper_m(strrchr_m(stream_fname, ':') + 1);
 352         }
 353
 354         DEBUG(10, ("stream filename = %s\n", stream_fname));
 355
 356         /* Create an smb_filename with stream_name == NULL. */
 357         status = create_synthetic_smb_fname(talloc_tos(), stream_fname, NULL,
 358                                             NULL, smb_fname_out);
 359         if (!NT_STATUS_IS_OK(status)) {
 360                 return status;
 361         }
 362
 363         return NT_STATUS_OK;
 364
 365  fail:
 366         DEBUG(5, ("stream_name failed: %s\n", strerror(errno)));
 367         TALLOC_FREE(*smb_fname_out);
 368         return status;
 369 }
 370
 371 static NTSTATUS walk_streams(vfs_handle_struct *handle,
 372                              struct smb_filename *smb_fname_base,
 373                              char **pdirname,
 374                              bool (*fn)(const char *dirname,
 375                                         const char *dirent,
 376                                         void *private_data),
 377                              void *private_data)
 378 {
 379         char *dirname;
 380         SMB_STRUCT_DIR *dirhandle = NULL;
 381         char *dirent;
 382
 383         dirname = stream_dir(handle, smb_fname_base, &smb_fname_base->st,
 384                              false);
 385
 386         if (dirname == NULL) {
 387                 if (errno == ENOENT) {
 388                         /*
 389                          * no stream around
 390                          */
 391                         return NT_STATUS_OK;
 392                 }
 393                 return map_nt_error_from_unix(errno);
 394         }
 395
 396         DEBUG(10, ("walk_streams: dirname=%s\n", dirname));
 397
 398         dirhandle = SMB_VFS_NEXT_OPENDIR(handle, dirname, NULL, 0);
 399
 400         if (dirhandle == NULL) {
 401                 TALLOC_FREE(dirname);
 402                 return map_nt_error_from_unix(errno);
 403         }
 404
 405         while ((dirent = vfs_readdirname(handle->conn, dirhandle, NULL)) != NULL) {
 406
 407                 if (ISDOT(dirent) || ISDOTDOT(dirent)) {
 408                         continue;
 409                 }
 410
 411                 DEBUG(10, ("walk_streams: dirent=%s\n", dirent));
 412
 413                 if (!fn(dirname, dirent, private_data)) {
 414                         break;
 415                 }
 416         }
 417
 418         SMB_VFS_NEXT_CLOSEDIR(handle, dirhandle);
 419
 420         if (pdirname != NULL) {
 421                 *pdirname = dirname;
 422         }
 423         else {
 424                 TALLOC_FREE(dirname);
 425         }
 426
 427         return NT_STATUS_OK;
 428 }
 429
 430 /**
 431  * Helper to stat/lstat the base file of an smb_fname. This will actually
 432  * fills in the stat struct in smb_filename.
 433  */
 434 static int streams_depot_stat_base(vfs_handle_struct *handle,
 435                                    struct smb_filename *smb_fname,
 436                                    bool follow_links)
 437 {
 438         char *tmp_stream_name;
 439         int result;
 440
 441         tmp_stream_name = smb_fname->stream_name;
 442         smb_fname->stream_name = NULL;
 443         if (follow_links) {
 444                 result = SMB_VFS_NEXT_STAT(handle, smb_fname);
 445         } else {
 446                 result = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 447         }
 448         smb_fname->stream_name = tmp_stream_name;
 449         return result;
 450 }
 451
 452 static int streams_depot_stat(vfs_handle_struct *handle,
 453                               struct smb_filename *smb_fname)
 454 {
 455         struct smb_filename *smb_fname_stream = NULL;
 456         NTSTATUS status;
 457         int ret = -1;
 458
 459         DEBUG(10, ("streams_depot_stat called for [%s]\n",
 460                    smb_fname_str_dbg(smb_fname)));
 461
 462         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 463                 return SMB_VFS_NEXT_STAT(handle, smb_fname);
 464         }
 465
 466         /* If the default stream is requested, just stat the base file. */
 467         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 468                 return streams_depot_stat_base(handle, smb_fname, true);
 469         }
 470
 471         /* Stat the actual stream now. */
 472         status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
 473                                   false);
 474         if (!NT_STATUS_IS_OK(status)) {
 475                 ret = -1;
 476                 errno = map_errno_from_nt_status(status);
 477                 goto done;
 478         }
 479
 480         ret = SMB_VFS_NEXT_STAT(handle, smb_fname_stream);
 481
 482         /* Update the original smb_fname with the stat info. */
 483         smb_fname->st = smb_fname_stream->st;
 484  done:
 485         TALLOC_FREE(smb_fname_stream);
 486         return ret;
 487 }
 488
 489
 490
 491 static int streams_depot_lstat(vfs_handle_struct *handle,
 492                                struct smb_filename *smb_fname)
 493 {
 494         struct smb_filename *smb_fname_stream = NULL;
 495         NTSTATUS status;
 496         int ret = -1;
 497
 498         DEBUG(10, ("streams_depot_lstat called for [%s]\n",
 499                    smb_fname_str_dbg(smb_fname)));
 500
 501         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 502                 return SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 503         }
 504
 505         /* If the default stream is requested, just stat the base file. */
 506         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 507                 return streams_depot_stat_base(handle, smb_fname, false);
 508         }
 509
 510         /* Stat the actual stream now. */
 511         status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
 512                                   false);
 513         if (!NT_STATUS_IS_OK(status)) {
 514                 ret = -1;
 515                 errno = map_errno_from_nt_status(status);
 516                 goto done;
 517         }
 518
 519         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_stream);
 520
 521  done:
 522         TALLOC_FREE(smb_fname_stream);
 523         return ret;
 524 }
 525
 526 static int streams_depot_open(vfs_handle_struct *handle,
 527                               struct smb_filename *smb_fname,
 528                               files_struct *fsp, int flags, mode_t mode)
 529 {
 530         struct smb_filename *smb_fname_stream = NULL;
 531         struct smb_filename *smb_fname_base = NULL;
 532         NTSTATUS status;
 533         int ret = -1;
 534
 535         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 536                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 537         }
 538
 539         /* If the default stream is requested, just open the base file. */
 540         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 541                 char *tmp_stream_name;
 542
 543                 tmp_stream_name = smb_fname->stream_name;
 544                 smb_fname->stream_name = NULL;
 545                 ret = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 546                 smb_fname->stream_name = tmp_stream_name;
 547
 548                 return ret;
 549         }
 550
 551         /* Ensure the base file still exists. */
 552         status = create_synthetic_smb_fname(talloc_tos(),
 553                                             smb_fname->base_name,
 554                                             NULL, NULL,
 555                                             &smb_fname_base);
 556         if (!NT_STATUS_IS_OK(status)) {
 557                 ret = -1;
 558                 errno = map_errno_from_nt_status(status);
 559                 goto done;
 560         }
 561
 562         ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 563         if (ret == -1) {
 564                 goto done;
 565         }
 566
 567         /* Determine the stream name, and then open it. */
 568         status = stream_smb_fname(handle, smb_fname, &smb_fname_stream, true);
 569         if (!NT_STATUS_IS_OK(status)) {
 570                 ret = -1;
 571                 errno = map_errno_from_nt_status(status);
 572                 goto done;
 573         }
 574
 575         ret = SMB_VFS_NEXT_OPEN(handle, smb_fname_stream, fsp, flags, mode);
 576
 577  done:
 578         TALLOC_FREE(smb_fname_stream);
 579         TALLOC_FREE(smb_fname_base);
 580         return ret;
 581 }
 582
 583 static int streams_depot_unlink(vfs_handle_struct *handle,
 584                                 const struct smb_filename *smb_fname)
 585 {
 586         struct smb_filename *smb_fname_base = NULL;
 587         NTSTATUS status;
 588         int ret = -1;
 589
 590         DEBUG(10, ("streams_depot_unlink called for %s\n",
 591                    smb_fname_str_dbg(smb_fname)));
 592
 593         /* If there is a valid stream, just unlink the stream and return. */
 594         if (is_ntfs_stream_smb_fname(smb_fname) &&
 595             !is_ntfs_default_stream_smb_fname(smb_fname)) {
 596                 struct smb_filename *smb_fname_stream = NULL;
 597
 598                 status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
 599                                           false);
 600                 if (!NT_STATUS_IS_OK(status)) {
 601                         errno = map_errno_from_nt_status(status);
 602                         return -1;
 603                 }
 604
 605                 ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname_stream);
 606
 607                 TALLOC_FREE(smb_fname_stream);
 608                 return ret;
 609         }
 610
 611         /*
 612          * We potentially need to delete the per-inode streams directory
 613          */
 614
 615         status = create_synthetic_smb_fname(talloc_tos(), smb_fname->base_name,
 616                                             NULL, NULL, &smb_fname_base);
 617         if (!NT_STATUS_IS_OK(status)) {
 618                 errno = map_errno_from_nt_status(status);
 619                 return -1;
 620         }
 621
 622         if (lp_posix_pathnames()) {
 623                 ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_base);
 624         } else {
 625                 ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 626         }
 627
 628         if (ret == -1) {
 629                 TALLOC_FREE(smb_fname_base);
 630                 return -1;
 631         }
 632
 633         if (smb_fname_base->st.st_ex_nlink == 1) {
 634                 char *dirname = stream_dir(handle, smb_fname_base,
 635                                            &smb_fname_base->st, false);
 636
 637                 if (dirname != NULL) {
 638                         SMB_VFS_NEXT_RMDIR(handle, dirname);
 639                 }
 640                 TALLOC_FREE(dirname);
 641         }
 642
 643         ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname);
 644
 645         TALLOC_FREE(smb_fname_base);
 646         return ret;
 647 }
 648
 649 static int streams_depot_rename(vfs_handle_struct *handle,
 650                                 const struct smb_filename *smb_fname_src,
 651                                 const struct smb_filename *smb_fname_dst)
 652 {
 653         struct smb_filename *smb_fname_src_stream = NULL;
 654         struct smb_filename *smb_fname_dst_stream = NULL;
 655         struct smb_filename *smb_fname_dst_mod = NULL;
 656         bool src_is_stream, dst_is_stream;
 657         NTSTATUS status;
 658         int ret = -1;
 659
 660         DEBUG(10, ("streams_depot_rename called for %s => %s\n",
 661                    smb_fname_str_dbg(smb_fname_src),
 662                    smb_fname_str_dbg(smb_fname_dst)));
 663
 664         src_is_stream = is_ntfs_stream_smb_fname(smb_fname_src);
 665         dst_is_stream = is_ntfs_stream_smb_fname(smb_fname_dst);
 666
 667         if (!src_is_stream && !dst_is_stream) {
 668                 return SMB_VFS_NEXT_RENAME(handle, smb_fname_src,
 669                                            smb_fname_dst);
 670         }
 671
 672         /* for now don't allow renames from or to the default stream */
 673         if (is_ntfs_default_stream_smb_fname(smb_fname_src) ||
 674             is_ntfs_default_stream_smb_fname(smb_fname_dst)) {
 675                 errno = ENOSYS;
 676                 goto done;
 677         }
 678
 679         status = stream_smb_fname(handle, smb_fname_src, &smb_fname_src_stream,
 680                                   false);
 681         if (!NT_STATUS_IS_OK(status)) {
 682                 errno = map_errno_from_nt_status(status);
 683                 goto done;
 684         }
 685
 686         /*
 687          * Handle passing in a stream name without the base file.  This is
 688          * exercised by the NTRENAME streams rename path.
 689          */
 690         if (StrCaseCmp(smb_fname_dst->base_name, "./") == 0) {
 691                 status = create_synthetic_smb_fname(talloc_tos(),
 692                                                     smb_fname_src->base_name,
 693                                                     smb_fname_dst->stream_name,
 694                                                     NULL, &smb_fname_dst_mod);
 695                 if (!NT_STATUS_IS_OK(status)) {
 696                         errno = map_errno_from_nt_status(status);
 697                         goto done;
 698                 }
 699         }
 700
 701         status = stream_smb_fname(handle, (smb_fname_dst_mod ?
 702                                            smb_fname_dst_mod : smb_fname_dst),
 703                                   &smb_fname_dst_stream, false);
 704         if (!NT_STATUS_IS_OK(status)) {
 705                 errno = map_errno_from_nt_status(status);
 706                 goto done;
 707         }
 708
 709         ret = SMB_VFS_NEXT_RENAME(handle, smb_fname_src_stream,
 710                                   smb_fname_dst_stream);
 711
 712 done:
 713         TALLOC_FREE(smb_fname_src_stream);
 714         TALLOC_FREE(smb_fname_dst_stream);
 715         TALLOC_FREE(smb_fname_dst_mod);
 716         return ret;
 717 }
 718
 719 static bool add_one_stream(TALLOC_CTX *mem_ctx, unsigned int *num_streams,
 720                            struct stream_struct **streams,
 721                            const char *name, SMB_OFF_T size,
 722                            SMB_OFF_T alloc_size)
 723 {
 724         struct stream_struct *tmp;
 725
 726         tmp = TALLOC_REALLOC_ARRAY(mem_ctx, *streams, struct stream_struct,
 727                                    (*num_streams)+1);
 728         if (tmp == NULL) {
 729                 return false;
 730         }
 731
 732         tmp[*num_streams].name = talloc_strdup(tmp, name);
 733         if (tmp[*num_streams].name == NULL) {
 734                 return false;
 735         }
 736
 737         tmp[*num_streams].size = size;
 738         tmp[*num_streams].alloc_size = alloc_size;
 739
 740         *streams = tmp;
 741         *num_streams += 1;
 742         return true;
 743 }
 744
 745 struct streaminfo_state {
 746         TALLOC_CTX *mem_ctx;
 747         vfs_handle_struct *handle;
 748         unsigned int num_streams;
 749         struct stream_struct *streams;
 750         NTSTATUS status;
 751 };
 752
 753 static bool collect_one_stream(const char *dirname,
 754                                const char *dirent,
 755                                void *private_data)
 756 {
 757         struct streaminfo_state *state =
 758                 (struct streaminfo_state *)private_data;
 759         struct smb_filename *smb_fname = NULL;
 760         char *sname = NULL;
 761         NTSTATUS status;
 762         bool ret;
 763
 764         sname = talloc_asprintf(talloc_tos(), "%s/%s", dirname, dirent);
 765         if (sname == NULL) {
 766                 state->status = NT_STATUS_NO_MEMORY;
 767                 ret = false;
 768                 goto out;
 769         }
 770
 771         status = create_synthetic_smb_fname(talloc_tos(), sname, NULL,
 772                                             NULL, &smb_fname);
 773         if (!NT_STATUS_IS_OK(status)) {
 774                 state->status = status;
 775                 ret = false;
 776                 goto out;
 777         }
 778
 779         if (SMB_VFS_NEXT_STAT(state->handle, smb_fname) == -1) {
 780                 DEBUG(10, ("Could not stat %s: %s\n", sname,
 781                            strerror(errno)));
 782                 ret = true;
 783                 goto out;
 784         }
 785
 786         if (!add_one_stream(state->mem_ctx,
 787                             &state->num_streams, &state->streams,
 788                             dirent, smb_fname->st.st_ex_size,
 789                             SMB_VFS_GET_ALLOC_SIZE(state->handle->conn, NULL,
 790                                                    &smb_fname->st))) {
 791                 state->status = NT_STATUS_NO_MEMORY;
 792                 ret = false;
 793                 goto out;
 794         }
 795
 796         ret = true;
 797  out:
 798         TALLOC_FREE(sname);
 799         TALLOC_FREE(smb_fname);
 800         return ret;
 801 }
 802
 803 static NTSTATUS streams_depot_streaminfo(vfs_handle_struct *handle,
 804                                          struct files_struct *fsp,
 805                                          const char *fname,
 806                                          TALLOC_CTX *mem_ctx,
 807                                          unsigned int *pnum_streams,
 808                                          struct stream_struct **pstreams)
 809 {
 810         struct smb_filename *smb_fname_base = NULL;
 811         int ret;
 812         NTSTATUS status;
 813         struct streaminfo_state state;
 814
 815         status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
 816                                             &smb_fname_base);
 817         if (!NT_STATUS_IS_OK(status)) {
 818                 return status;
 819         }
 820
 821         if ((fsp != NULL) && (fsp->fh->fd != -1)) {
 822                 ret = SMB_VFS_NEXT_FSTAT(handle, fsp, &smb_fname_base->st);
 823         }
 824         else {
 825                 if (lp_posix_pathnames()) {
 826                         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_base);
 827                 } else {
 828                         ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 829                 }
 830         }
 831
 832         if (ret == -1) {
 833                 status = map_nt_error_from_unix(errno);
 834                 goto out;
 835         }
 836
 837         state.streams = NULL;
 838         state.num_streams = 0;
 839
 840         if (!S_ISDIR(smb_fname_base->st.st_ex_mode)) {
 841                 if (!add_one_stream(mem_ctx,
 842                                     &state.num_streams, &state.streams,
 843                                     "::$DATA", smb_fname_base->st.st_ex_size,
 844                                     SMB_VFS_GET_ALLOC_SIZE(handle->conn, fsp,
 845                                                        &smb_fname_base->st))) {
 846                         status = NT_STATUS_NO_MEMORY;
 847                         goto out;
 848                 }
 849         }
 850
 851         state.mem_ctx = mem_ctx;
 852         state.handle = handle;
 853         state.status = NT_STATUS_OK;
 854
 855         status = walk_streams(handle, smb_fname_base, NULL, collect_one_stream,
 856                               &state);
 857
 858         if (!NT_STATUS_IS_OK(status)) {
 859                 TALLOC_FREE(state.streams);
 860                 goto out;
 861         }
 862
 863         if (!NT_STATUS_IS_OK(state.status)) {
 864                 TALLOC_FREE(state.streams);
 865                 status = state.status;
 866                 goto out;
 867         }
 868
 869         *pnum_streams = state.num_streams;
 870         *pstreams = state.streams;
 871         status = NT_STATUS_OK;
 872
 873  out:
 874         TALLOC_FREE(smb_fname_base);
 875         return status;
 876 }
 877
 878 static uint32_t streams_depot_fs_capabilities(struct vfs_handle_struct *handle,
 879                         enum timestamp_set_resolution *p_ts_res)
 880 {
 881         return SMB_VFS_NEXT_FS_CAPABILITIES(handle, p_ts_res) | FILE_NAMED_STREAMS;
 882 }
 883
 884 static struct vfs_fn_pointers vfs_streams_depot_fns = {
 885         .fs_capabilities = streams_depot_fs_capabilities,
 886         .open = streams_depot_open,
 887         .stat = streams_depot_stat,
 888         .lstat = streams_depot_lstat,
 889         .unlink = streams_depot_unlink,
 890         .rename = streams_depot_rename,
 891         .streaminfo = streams_depot_streaminfo,
 892 };
 893
 894 NTSTATUS vfs_streams_depot_init(void);
 895 NTSTATUS vfs_streams_depot_init(void)
 896 {
 897         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "streams_depot",
 898                                 &vfs_streams_depot_fns);
 899 }