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         int ret;
 132
 133         check_valid = lp_parm_bool(SNUM(handle->conn),
 134                       "streams_depot", "check_valid", true);
 135
 136         tmp = talloc_asprintf(talloc_tos(), "%s/.streams",
 137                 handle->conn->connectpath);
 138
 139         if (tmp == NULL) {
 140                 errno = ENOMEM;
 141                 goto fail;
 142         }
 143
 144         rootdir = lp_parm_talloc_string(talloc_tos(),
 145                 SNUM(handle->conn), "streams_depot", "directory",
 146                 tmp);
 147         if (rootdir == NULL) {
 148                 errno = ENOMEM;
 149                 goto fail;
 150         }
 151
 152         rootdir_fname = synthetic_smb_fname(talloc_tos(),
 153                                         rootdir,
 154                                         NULL,
 155                                         NULL,
 156                                         smb_fname->flags);
 157         if (rootdir_fname == NULL) {
 158                 errno = ENOMEM;
 159                 goto fail;
 160         }
 161
 162         /* Stat the base file if it hasn't already been done. */
 163         if (base_sbuf == NULL) {
 164                 struct smb_filename *smb_fname_base;
 165
 166                 smb_fname_base = synthetic_smb_fname(
 167                                         talloc_tos(),
 168                                         smb_fname->base_name,
 169                                         NULL,
 170                                         NULL,
 171                                         smb_fname->flags);
 172                 if (smb_fname_base == NULL) {
 173                         errno = ENOMEM;
 174                         goto fail;
 175                 }
 176                 if (SMB_VFS_NEXT_STAT(handle, smb_fname_base) == -1) {
 177                         TALLOC_FREE(smb_fname_base);
 178                         goto fail;
 179                 }
 180                 base_sbuf_tmp = smb_fname_base->st;
 181                 TALLOC_FREE(smb_fname_base);
 182         } else {
 183                 base_sbuf_tmp = *base_sbuf;
 184         }
 185
 186         id = SMB_VFS_FILE_ID_CREATE(handle->conn, &base_sbuf_tmp);
 187
 188         push_file_id_16((char *)id_buf, &id);
 189
 190         hash = hash_fn(data_blob_const(id_buf, sizeof(id_buf)));
 191
 192         first = hash & 0xff;
 193         second = (hash >> 8) & 0xff;
 194
 195         id_hex = hex_encode_talloc(talloc_tos(), id_buf, sizeof(id_buf));
 196
 197         if (id_hex == NULL) {
 198                 errno = ENOMEM;
 199                 goto fail;
 200         }
 201
 202         result = talloc_asprintf(talloc_tos(), "%s/%2.2X/%2.2X/%s", rootdir,
 203                                  first, second, id_hex);
 204
 205         TALLOC_FREE(id_hex);
 206
 207         if (result == NULL) {
 208                 errno = ENOMEM;
 209                 return NULL;
 210         }
 211
 212         smb_fname_hash = synthetic_smb_fname(talloc_tos(),
 213                                         result,
 214                                         NULL,
 215                                         NULL,
 216                                         smb_fname->flags);
 217         if (smb_fname_hash == NULL) {
 218                 errno = ENOMEM;
 219                 goto fail;
 220         }
 221
 222         if (SMB_VFS_NEXT_STAT(handle, smb_fname_hash) == 0) {
 223                 struct smb_filename *smb_fname_new = NULL;
 224                 char *newname;
 225                 bool delete_lost;
 226
 227                 if (!S_ISDIR(smb_fname_hash->st.st_ex_mode)) {
 228                         errno = EINVAL;
 229                         goto fail;
 230                 }
 231
 232                 if (!check_valid ||
 233                     file_is_valid(handle, smb_fname)) {
 234                         return result;
 235                 }
 236
 237                 /*
 238                  * Someone has recreated a file under an existing inode
 239                  * without deleting the streams directory.
 240                  * Move it away or remove if streams_depot:delete_lost is set.
 241                  */
 242
 243         again:
 244                 delete_lost = lp_parm_bool(SNUM(handle->conn), "streams_depot",
 245                                            "delete_lost", false);
 246
 247                 if (delete_lost) {
 248                         DEBUG(3, ("Someone has recreated a file under an "
 249                               "existing inode. Removing: %s\n",
 250                               smb_fname_hash->base_name));
 251                         recursive_rmdir(talloc_tos(), handle->conn,
 252                                         smb_fname_hash);
 253                         SMB_VFS_NEXT_RMDIR(handle, smb_fname_hash);
 254                 } else {
 255                         newname = talloc_asprintf(talloc_tos(), "lost-%lu",
 256                                                   random());
 257                         DEBUG(3, ("Someone has recreated a file under an "
 258                               "existing inode. Renaming: %s to: %s\n",
 259                               smb_fname_hash->base_name,
 260                               newname));
 261                         if (newname == NULL) {
 262                                 errno = ENOMEM;
 263                                 goto fail;
 264                         }
 265
 266                         smb_fname_new = synthetic_smb_fname(
 267                                                 talloc_tos(),
 268                                                 newname,
 269                                                 NULL,
 270                                                 NULL,
 271                                                 smb_fname->flags);
 272                         TALLOC_FREE(newname);
 273                         if (smb_fname_new == NULL) {
 274                                 errno = ENOMEM;
 275                                 goto fail;
 276                         }
 277
 278                         if (SMB_VFS_NEXT_RENAMEAT(handle,
 279                                         handle->conn->cwd_fsp,
 280                                         smb_fname_hash,
 281                                         handle->conn->cwd_fsp,
 282                                         smb_fname_new) == -1) {
 283                                 TALLOC_FREE(smb_fname_new);
 284                                 if ((errno == EEXIST) || (errno == ENOTEMPTY)) {
 285                                         goto again;
 286                                 }
 287                                 goto fail;
 288                         }
 289
 290                         TALLOC_FREE(smb_fname_new);
 291                 }
 292         }
 293
 294         if (!create_it) {
 295                 errno = ENOENT;
 296                 goto fail;
 297         }
 298
 299         ret = SMB_VFS_NEXT_MKDIRAT(handle,
 300                                 handle->conn->cwd_fsp,
 301                                 rootdir_fname,
 302                                 0755);
 303         if ((ret != 0) && (errno != EEXIST)) {
 304                 goto fail;
 305         }
 306
 307         tmp = talloc_asprintf(result, "%s/%2.2X", rootdir, first);
 308         if (tmp == NULL) {
 309                 errno = ENOMEM;
 310                 goto fail;
 311         }
 312
 313         tmp_fname = synthetic_smb_fname(talloc_tos(),
 314                                         tmp,
 315                                         NULL,
 316                                         NULL,
 317                                         smb_fname->flags);
 318         if (tmp_fname == NULL) {
 319                 errno = ENOMEM;
 320                 goto fail;
 321         }
 322
 323         ret = SMB_VFS_NEXT_MKDIRAT(handle,
 324                                 handle->conn->cwd_fsp,
 325                                 tmp_fname,
 326                                 0755);
 327         if ((ret != 0) && (errno != EEXIST)) {
 328                 goto fail;
 329         }
 330
 331         TALLOC_FREE(tmp);
 332         TALLOC_FREE(tmp_fname);
 333
 334         tmp = talloc_asprintf(result, "%s/%2.2X/%2.2X", rootdir, first,
 335                               second);
 336         if (tmp == NULL) {
 337                 errno = ENOMEM;
 338                 goto fail;
 339         }
 340
 341         tmp_fname = synthetic_smb_fname(talloc_tos(),
 342                                         tmp,
 343                                         NULL,
 344                                         NULL,
 345                                         smb_fname->flags);
 346         if (tmp_fname == NULL) {
 347                 errno = ENOMEM;
 348                 goto fail;
 349         }
 350
 351         ret = SMB_VFS_NEXT_MKDIRAT(handle,
 352                         handle->conn->cwd_fsp,
 353                         tmp_fname,
 354                         0755);
 355         if ((ret != 0) && (errno != EEXIST)) {
 356                 goto fail;
 357         }
 358
 359         TALLOC_FREE(tmp);
 360         TALLOC_FREE(tmp_fname);
 361
 362         /* smb_fname_hash is the struct smb_filename version of 'result' */
 363         ret = SMB_VFS_NEXT_MKDIRAT(handle,
 364                         handle->conn->cwd_fsp,
 365                         smb_fname_hash,
 366                         0755);
 367         if ((ret != 0) && (errno != EEXIST)) {
 368                 goto fail;
 369         }
 370
 371         if (check_valid && !mark_file_valid(handle, smb_fname)) {
 372                 goto fail;
 373         }
 374
 375         TALLOC_FREE(rootdir_fname);
 376         TALLOC_FREE(rootdir);
 377         TALLOC_FREE(tmp_fname);
 378         TALLOC_FREE(smb_fname_hash);
 379         return result;
 380
 381  fail:
 382         TALLOC_FREE(rootdir_fname);
 383         TALLOC_FREE(rootdir);
 384         TALLOC_FREE(tmp_fname);
 385         TALLOC_FREE(smb_fname_hash);
 386         TALLOC_FREE(result);
 387         return NULL;
 388 }
 389 /**
 390  * Given a stream name, populate smb_fname_out with the actual location of the
 391  * stream.
 392  */
 393 static NTSTATUS stream_smb_fname(vfs_handle_struct *handle,
 394                                  const struct smb_filename *smb_fname,
 395                                  struct smb_filename **smb_fname_out,
 396                                  bool create_dir)
 397 {
 398         char *dirname, *stream_fname;
 399         const char *stype;
 400         NTSTATUS status;
 401
 402         *smb_fname_out = NULL;
 403
 404         stype = strchr_m(smb_fname->stream_name + 1, ':');
 405
 406         if (stype) {
 407                 if (strcasecmp_m(stype, ":$DATA") != 0) {
 408                         return NT_STATUS_INVALID_PARAMETER;
 409                 }
 410         }
 411
 412         dirname = stream_dir(handle, smb_fname, NULL, create_dir);
 413
 414         if (dirname == NULL) {
 415                 status = map_nt_error_from_unix(errno);
 416                 goto fail;
 417         }
 418
 419         stream_fname = talloc_asprintf(talloc_tos(), "%s/%s", dirname,
 420                                        smb_fname->stream_name);
 421
 422         if (stream_fname == NULL) {
 423                 status = NT_STATUS_NO_MEMORY;
 424                 goto fail;
 425         }
 426
 427         if (stype == NULL) {
 428                 /* Append an explicit stream type if one wasn't specified. */
 429                 stream_fname = talloc_asprintf(talloc_tos(), "%s:$DATA",
 430                                                stream_fname);
 431                 if (stream_fname == NULL) {
 432                         status = NT_STATUS_NO_MEMORY;
 433                         goto fail;
 434                 }
 435         } else {
 436                 /* Normalize the stream type to upercase. */
 437                 if (!strupper_m(strrchr_m(stream_fname, ':') + 1)) {
 438                         status = NT_STATUS_INVALID_PARAMETER;
 439                         goto fail;
 440                 }
 441         }
 442
 443         DEBUG(10, ("stream filename = %s\n", stream_fname));
 444
 445         /* Create an smb_filename with stream_name == NULL. */
 446         *smb_fname_out = synthetic_smb_fname(talloc_tos(),
 447                                         stream_fname,
 448                                         NULL,
 449                                         NULL,
 450                                         smb_fname->flags);
 451         if (*smb_fname_out == NULL) {
 452                 return NT_STATUS_NO_MEMORY;
 453         }
 454
 455         return NT_STATUS_OK;
 456
 457  fail:
 458         DEBUG(5, ("stream_name failed: %s\n", strerror(errno)));
 459         TALLOC_FREE(*smb_fname_out);
 460         return status;
 461 }
 462
 463 static NTSTATUS walk_streams(vfs_handle_struct *handle,
 464                              struct smb_filename *smb_fname_base,
 465                              char **pdirname,
 466                              bool (*fn)(const char *dirname,
 467                                         const char *dirent,
 468                                         void *private_data),
 469                              void *private_data)
 470 {
 471         char *dirname;
 472         struct smb_filename *dir_smb_fname = NULL;
 473         DIR *dirhandle = NULL;
 474         const char *dirent = NULL;
 475         char *talloced = NULL;
 476
 477         dirname = stream_dir(handle, smb_fname_base, &smb_fname_base->st,
 478                              false);
 479
 480         if (dirname == NULL) {
 481                 if (errno == ENOENT) {
 482                         /*
 483                          * no stream around
 484                          */
 485                         return NT_STATUS_OK;
 486                 }
 487                 return map_nt_error_from_unix(errno);
 488         }
 489
 490         DEBUG(10, ("walk_streams: dirname=%s\n", dirname));
 491
 492         dir_smb_fname = synthetic_smb_fname(talloc_tos(),
 493                                         dirname,
 494                                         NULL,
 495                                         NULL,
 496                                         smb_fname_base->flags);
 497         if (dir_smb_fname == NULL) {
 498                 TALLOC_FREE(dirname);
 499                 return NT_STATUS_NO_MEMORY;
 500         }
 501
 502         dirhandle = SMB_VFS_NEXT_OPENDIR(handle, dir_smb_fname, NULL, 0);
 503
 504         TALLOC_FREE(dir_smb_fname);
 505
 506         if (dirhandle == NULL) {
 507                 TALLOC_FREE(dirname);
 508                 return map_nt_error_from_unix(errno);
 509         }
 510
 511         while ((dirent = vfs_readdirname(handle->conn, dirhandle, NULL,
 512                                          &talloced)) != NULL) {
 513
 514                 if (ISDOT(dirent) || ISDOTDOT(dirent)) {
 515                         TALLOC_FREE(talloced);
 516                         continue;
 517                 }
 518
 519                 DEBUG(10, ("walk_streams: dirent=%s\n", dirent));
 520
 521                 if (!fn(dirname, dirent, private_data)) {
 522                         TALLOC_FREE(talloced);
 523                         break;
 524                 }
 525                 TALLOC_FREE(talloced);
 526         }
 527
 528         SMB_VFS_NEXT_CLOSEDIR(handle, dirhandle);
 529
 530         if (pdirname != NULL) {
 531                 *pdirname = dirname;
 532         }
 533         else {
 534                 TALLOC_FREE(dirname);
 535         }
 536
 537         return NT_STATUS_OK;
 538 }
 539
 540 static int streams_depot_stat(vfs_handle_struct *handle,
 541                               struct smb_filename *smb_fname)
 542 {
 543         struct smb_filename *smb_fname_stream = NULL;
 544         NTSTATUS status;
 545         int ret = -1;
 546
 547         DEBUG(10, ("streams_depot_stat called for [%s]\n",
 548                    smb_fname_str_dbg(smb_fname)));
 549
 550         if (!is_named_stream(smb_fname)) {
 551                 return SMB_VFS_NEXT_STAT(handle, smb_fname);
 552         }
 553
 554         /* Stat the actual stream now. */
 555         status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
 556                                   false);
 557         if (!NT_STATUS_IS_OK(status)) {
 558                 ret = -1;
 559                 errno = map_errno_from_nt_status(status);
 560                 goto done;
 561         }
 562
 563         ret = SMB_VFS_NEXT_STAT(handle, smb_fname_stream);
 564
 565         /* Update the original smb_fname with the stat info. */
 566         smb_fname->st = smb_fname_stream->st;
 567  done:
 568         TALLOC_FREE(smb_fname_stream);
 569         return ret;
 570 }
 571
 572
 573
 574 static int streams_depot_lstat(vfs_handle_struct *handle,
 575                                struct smb_filename *smb_fname)
 576 {
 577         struct smb_filename *smb_fname_stream = NULL;
 578         NTSTATUS status;
 579         int ret = -1;
 580
 581         DEBUG(10, ("streams_depot_lstat called for [%s]\n",
 582                    smb_fname_str_dbg(smb_fname)));
 583
 584         if (!is_named_stream(smb_fname)) {
 585                 return SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 586         }
 587
 588         /* Stat the actual stream now. */
 589         status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
 590                                   false);
 591         if (!NT_STATUS_IS_OK(status)) {
 592                 ret = -1;
 593                 errno = map_errno_from_nt_status(status);
 594                 goto done;
 595         }
 596
 597         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_stream);
 598
 599  done:
 600         TALLOC_FREE(smb_fname_stream);
 601         return ret;
 602 }
 603
 604 static int streams_depot_open(vfs_handle_struct *handle,
 605                               struct smb_filename *smb_fname,
 606                               files_struct *fsp, int flags, mode_t mode)
 607 {
 608         struct smb_filename *smb_fname_stream = NULL;
 609         struct smb_filename *smb_fname_base = NULL;
 610         NTSTATUS status;
 611         int ret = -1;
 612
 613         if (!is_named_stream(smb_fname)) {
 614                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 615         }
 616
 617         /* Ensure the base file still exists. */
 618         smb_fname_base = synthetic_smb_fname(talloc_tos(),
 619                                         smb_fname->base_name,
 620                                         NULL,
 621                                         NULL,
 622                                         smb_fname->flags);
 623         if (smb_fname_base == NULL) {
 624                 ret = -1;
 625                 errno = ENOMEM;
 626                 goto done;
 627         }
 628
 629         ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 630         if (ret == -1) {
 631                 goto done;
 632         }
 633
 634         /* Determine the stream name, and then open it. */
 635         status = stream_smb_fname(handle, smb_fname, &smb_fname_stream, true);
 636         if (!NT_STATUS_IS_OK(status)) {
 637                 ret = -1;
 638                 errno = map_errno_from_nt_status(status);
 639                 goto done;
 640         }
 641
 642         ret = SMB_VFS_NEXT_OPEN(handle, smb_fname_stream, fsp, flags, mode);
 643
 644  done:
 645         TALLOC_FREE(smb_fname_stream);
 646         TALLOC_FREE(smb_fname_base);
 647         return ret;
 648 }
 649
 650 static int streams_depot_unlink_internal(vfs_handle_struct *handle,
 651                                 struct files_struct *dirfsp,
 652                                 const struct smb_filename *smb_fname,
 653                                 int flags)
 654 {
 655         struct smb_filename *smb_fname_base = NULL;
 656         int ret = -1;
 657
 658         DEBUG(10, ("streams_depot_unlink called for %s\n",
 659                    smb_fname_str_dbg(smb_fname)));
 660
 661         /* If there is a valid stream, just unlink the stream and return. */
 662         if (is_named_stream(smb_fname)) {
 663                 struct smb_filename *smb_fname_stream = NULL;
 664                 NTSTATUS status;
 665
 666                 status = stream_smb_fname(handle, smb_fname, &smb_fname_stream,
 667                                           false);
 668                 if (!NT_STATUS_IS_OK(status)) {
 669                         errno = map_errno_from_nt_status(status);
 670                         return -1;
 671                 }
 672
 673                 ret = SMB_VFS_NEXT_UNLINKAT(handle,
 674                                 dirfsp,
 675                                 smb_fname_stream,
 676                                 0);
 677
 678                 TALLOC_FREE(smb_fname_stream);
 679                 return ret;
 680         }
 681
 682         /*
 683          * We potentially need to delete the per-inode streams directory
 684          */
 685
 686         smb_fname_base = synthetic_smb_fname(talloc_tos(),
 687                                         smb_fname->base_name,
 688                                         NULL,
 689                                         NULL,
 690                                         smb_fname->flags);
 691         if (smb_fname_base == NULL) {
 692                 errno = ENOMEM;
 693                 return -1;
 694         }
 695
 696         if (smb_fname_base->flags & SMB_FILENAME_POSIX_PATH) {
 697                 ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_base);
 698         } else {
 699                 ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 700         }
 701
 702         if (ret == -1) {
 703                 TALLOC_FREE(smb_fname_base);
 704                 return -1;
 705         }
 706
 707         /*
 708          * We know the unlink should succeed as the ACL
 709          * check is already done in the caller. Remove the
 710          * file *after* the streams.
 711          */
 712         {
 713                 char *dirname = stream_dir(handle, smb_fname_base,
 714                                            &smb_fname_base->st, false);
 715
 716                 if (dirname != NULL) {
 717                         struct smb_filename *smb_fname_dir =
 718                                 synthetic_smb_fname(talloc_tos(),
 719                                                 dirname,
 720                                                 NULL,
 721                                                 NULL,
 722                                                 smb_fname->flags);
 723                         if (smb_fname_dir == NULL) {
 724                                 TALLOC_FREE(smb_fname_base);
 725                                 TALLOC_FREE(dirname);
 726                                 errno = ENOMEM;
 727                                 return -1;
 728                         }
 729                         SMB_VFS_NEXT_RMDIR(handle, smb_fname_dir);
 730                         TALLOC_FREE(smb_fname_dir);
 731                 }
 732                 TALLOC_FREE(dirname);
 733         }
 734
 735         ret = SMB_VFS_NEXT_UNLINKAT(handle,
 736                                 dirfsp,
 737                                 smb_fname,
 738                                 flags);
 739         TALLOC_FREE(smb_fname_base);
 740         return ret;
 741 }
 742
 743 static int streams_depot_rmdir(vfs_handle_struct *handle,
 744                                 const struct smb_filename *smb_fname)
 745 {
 746         struct smb_filename *smb_fname_base = NULL;
 747         int ret = -1;
 748
 749         DEBUG(10, ("streams_depot_rmdir called for %s\n",
 750                 smb_fname->base_name));
 751
 752         /*
 753          * We potentially need to delete the per-inode streams directory
 754          */
 755
 756         smb_fname_base = synthetic_smb_fname(talloc_tos(),
 757                                 smb_fname->base_name,
 758                                 NULL,
 759                                 NULL,
 760                                 smb_fname->flags);
 761         if (smb_fname_base == NULL) {
 762                 errno = ENOMEM;
 763                 return -1;
 764         }
 765
 766         if (smb_fname_base->flags & SMB_FILENAME_POSIX_PATH) {
 767                 ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_base);
 768         } else {
 769                 ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 770         }
 771
 772         if (ret == -1) {
 773                 TALLOC_FREE(smb_fname_base);
 774                 return -1;
 775         }
 776
 777         /*
 778          * We know the rmdir should succeed as the ACL
 779          * check is already done in the caller. Remove the
 780          * directory *after* the streams.
 781          */
 782         {
 783                 char *dirname = stream_dir(handle, smb_fname_base,
 784                                            &smb_fname_base->st, false);
 785
 786                 if (dirname != NULL) {
 787                         struct smb_filename *smb_fname_dir =
 788                                 synthetic_smb_fname(talloc_tos(),
 789                                                 dirname,
 790                                                 NULL,
 791                                                 NULL,
 792                                                 smb_fname->flags);
 793                         if (smb_fname_dir == NULL) {
 794                                 TALLOC_FREE(smb_fname_base);
 795                                 TALLOC_FREE(dirname);
 796                                 errno = ENOMEM;
 797                                 return -1;
 798                         }
 799                         SMB_VFS_NEXT_RMDIR(handle, smb_fname_dir);
 800                         TALLOC_FREE(smb_fname_dir);
 801                 }
 802                 TALLOC_FREE(dirname);
 803         }
 804
 805         ret = SMB_VFS_NEXT_RMDIR(handle, smb_fname_base);
 806         TALLOC_FREE(smb_fname_base);
 807         return ret;
 808 }
 809
 810 static int streams_depot_unlinkat(vfs_handle_struct *handle,
 811                         struct files_struct *dirfsp,
 812                         const struct smb_filename *smb_fname,
 813                         int flags)
 814 {
 815         int ret;
 816         SMB_ASSERT(dirfsp == dirfsp->conn->cwd_fsp);
 817         if (flags & AT_REMOVEDIR) {
 818                 ret = streams_depot_rmdir(handle, smb_fname);
 819         } else {
 820                 ret = streams_depot_unlink_internal(handle,
 821                                 dirfsp,
 822                                 smb_fname,
 823                                 flags);
 824         }
 825         return ret;
 826 }
 827
 828 static int streams_depot_renameat(vfs_handle_struct *handle,
 829                                 files_struct *srcfsp,
 830                                 const struct smb_filename *smb_fname_src,
 831                                 files_struct *dstfsp,
 832                                 const struct smb_filename *smb_fname_dst)
 833 {
 834         struct smb_filename *smb_fname_src_stream = NULL;
 835         struct smb_filename *smb_fname_dst_stream = NULL;
 836         bool src_is_stream, dst_is_stream;
 837         NTSTATUS status;
 838         int ret = -1;
 839
 840         DEBUG(10, ("streams_depot_renameat called for %s => %s\n",
 841                    smb_fname_str_dbg(smb_fname_src),
 842                    smb_fname_str_dbg(smb_fname_dst)));
 843
 844         src_is_stream = is_ntfs_stream_smb_fname(smb_fname_src);
 845         dst_is_stream = is_ntfs_stream_smb_fname(smb_fname_dst);
 846
 847         if (!src_is_stream && !dst_is_stream) {
 848                 return SMB_VFS_NEXT_RENAMEAT(handle,
 849                                         srcfsp,
 850                                         smb_fname_src,
 851                                         dstfsp,
 852                                         smb_fname_dst);
 853         }
 854
 855         /* for now don't allow renames from or to the default stream */
 856         if (is_ntfs_default_stream_smb_fname(smb_fname_src) ||
 857             is_ntfs_default_stream_smb_fname(smb_fname_dst)) {
 858                 errno = ENOSYS;
 859                 goto done;
 860         }
 861
 862         status = stream_smb_fname(handle, smb_fname_src, &smb_fname_src_stream,
 863                                   false);
 864         if (!NT_STATUS_IS_OK(status)) {
 865                 errno = map_errno_from_nt_status(status);
 866                 goto done;
 867         }
 868
 869         status = stream_smb_fname(handle, smb_fname_dst,
 870                                   &smb_fname_dst_stream, false);
 871         if (!NT_STATUS_IS_OK(status)) {
 872                 errno = map_errno_from_nt_status(status);
 873                 goto done;
 874         }
 875
 876         ret = SMB_VFS_NEXT_RENAMEAT(handle,
 877                                 srcfsp,
 878                                 smb_fname_src_stream,
 879                                 dstfsp,
 880                                 smb_fname_dst_stream);
 881
 882 done:
 883         TALLOC_FREE(smb_fname_src_stream);
 884         TALLOC_FREE(smb_fname_dst_stream);
 885         return ret;
 886 }
 887
 888 static bool add_one_stream(TALLOC_CTX *mem_ctx, unsigned int *num_streams,
 889                            struct stream_struct **streams,
 890                            const char *name, off_t size,
 891                            off_t alloc_size)
 892 {
 893         struct stream_struct *tmp;
 894
 895         tmp = talloc_realloc(mem_ctx, *streams, struct stream_struct,
 896                                    (*num_streams)+1);
 897         if (tmp == NULL) {
 898                 return false;
 899         }
 900
 901         tmp[*num_streams].name = talloc_strdup(tmp, name);
 902         if (tmp[*num_streams].name == NULL) {
 903                 return false;
 904         }
 905
 906         tmp[*num_streams].size = size;
 907         tmp[*num_streams].alloc_size = alloc_size;
 908
 909         *streams = tmp;
 910         *num_streams += 1;
 911         return true;
 912 }
 913
 914 struct streaminfo_state {
 915         TALLOC_CTX *mem_ctx;
 916         vfs_handle_struct *handle;
 917         unsigned int num_streams;
 918         struct stream_struct *streams;
 919         NTSTATUS status;
 920 };
 921
 922 static bool collect_one_stream(const char *dirname,
 923                                const char *dirent,
 924                                void *private_data)
 925 {
 926         struct streaminfo_state *state =
 927                 (struct streaminfo_state *)private_data;
 928         struct smb_filename *smb_fname = NULL;
 929         char *sname = NULL;
 930         bool ret;
 931
 932         sname = talloc_asprintf(talloc_tos(), "%s/%s", dirname, dirent);
 933         if (sname == NULL) {
 934                 state->status = NT_STATUS_NO_MEMORY;
 935                 ret = false;
 936                 goto out;
 937         }
 938
 939         smb_fname = synthetic_smb_fname(talloc_tos(), sname, NULL, NULL, 0);
 940         if (smb_fname == NULL) {
 941                 state->status = NT_STATUS_NO_MEMORY;
 942                 ret = false;
 943                 goto out;
 944         }
 945
 946         if (SMB_VFS_NEXT_STAT(state->handle, smb_fname) == -1) {
 947                 DEBUG(10, ("Could not stat %s: %s\n", sname,
 948                            strerror(errno)));
 949                 ret = true;
 950                 goto out;
 951         }
 952
 953         if (!add_one_stream(state->mem_ctx,
 954                             &state->num_streams, &state->streams,
 955                             dirent, smb_fname->st.st_ex_size,
 956                             SMB_VFS_GET_ALLOC_SIZE(state->handle->conn, NULL,
 957                                                    &smb_fname->st))) {
 958                 state->status = NT_STATUS_NO_MEMORY;
 959                 ret = false;
 960                 goto out;
 961         }
 962
 963         ret = true;
 964  out:
 965         TALLOC_FREE(sname);
 966         TALLOC_FREE(smb_fname);
 967         return ret;
 968 }
 969
 970 static NTSTATUS streams_depot_streaminfo(vfs_handle_struct *handle,
 971                                          struct files_struct *fsp,
 972                                          const struct smb_filename *smb_fname,
 973                                          TALLOC_CTX *mem_ctx,
 974                                          unsigned int *pnum_streams,
 975                                          struct stream_struct **pstreams)
 976 {
 977         struct smb_filename *smb_fname_base = NULL;
 978         int ret;
 979         NTSTATUS status;
 980         struct streaminfo_state state;
 981
 982         smb_fname_base = synthetic_smb_fname(talloc_tos(),
 983                                         smb_fname->base_name,
 984                                         NULL,
 985                                         NULL,
 986                                         smb_fname->flags);
 987         if (smb_fname_base == NULL) {
 988                 return NT_STATUS_NO_MEMORY;
 989         }
 990
 991         if ((fsp != NULL) && (fsp->fh->fd != -1)) {
 992                 ret = SMB_VFS_NEXT_FSTAT(handle, fsp, &smb_fname_base->st);
 993         }
 994         else {
 995                 if (smb_fname_base->flags & SMB_FILENAME_POSIX_PATH) {
 996                         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_base);
 997                 } else {
 998                         ret = SMB_VFS_NEXT_STAT(handle, smb_fname_base);
 999                 }
1000         }
1001
1002         if (ret == -1) {
1003                 status = map_nt_error_from_unix(errno);
1004                 goto out;
1005         }
1006
1007         state.streams = *pstreams;
1008         state.num_streams = *pnum_streams;
1009         state.mem_ctx = mem_ctx;
1010         state.handle = handle;
1011         state.status = NT_STATUS_OK;
1012
1013         if (S_ISLNK(smb_fname_base->st.st_ex_mode)) {
1014                 /*
1015                  * Currently we do't have SMB_VFS_LLISTXATTR
1016                  * inside the VFS which means there's no way
1017                  * to cope with a symlink when lp_posix_pathnames().
1018                  * returns true. For now ignore links.
1019                  * FIXME - by adding SMB_VFS_LLISTXATTR. JRA.
1020                  */
1021                 status = NT_STATUS_OK;
1022         } else {
1023                 status = walk_streams(handle, smb_fname_base, NULL, collect_one_stream,
1024                               &state);
1025         }
1026
1027         if (!NT_STATUS_IS_OK(status)) {
1028                 TALLOC_FREE(state.streams);
1029                 goto out;
1030         }
1031
1032         if (!NT_STATUS_IS_OK(state.status)) {
1033                 TALLOC_FREE(state.streams);
1034                 status = state.status;
1035                 goto out;
1036         }
1037
1038         *pnum_streams = state.num_streams;
1039         *pstreams = state.streams;
1040         status = SMB_VFS_NEXT_STREAMINFO(handle,
1041                                 fsp,
1042                                 smb_fname_base,
1043                                 mem_ctx,
1044                                 pnum_streams,
1045                                 pstreams);
1046
1047  out:
1048         TALLOC_FREE(smb_fname_base);
1049         return status;
1050 }
1051
1052 static uint32_t streams_depot_fs_capabilities(struct vfs_handle_struct *handle,
1053                         enum timestamp_set_resolution *p_ts_res)
1054 {
1055         return SMB_VFS_NEXT_FS_CAPABILITIES(handle, p_ts_res) | FILE_NAMED_STREAMS;
1056 }
1057
1058 static struct vfs_fn_pointers vfs_streams_depot_fns = {
1059         .fs_capabilities_fn = streams_depot_fs_capabilities,
1060         .open_fn = streams_depot_open,
1061         .stat_fn = streams_depot_stat,
1062         .lstat_fn = streams_depot_lstat,
1063         .unlinkat_fn = streams_depot_unlinkat,
1064         .rmdir_fn = streams_depot_rmdir,
1065         .renameat_fn = streams_depot_renameat,
1066         .streaminfo_fn = streams_depot_streaminfo,
1067 };
1068
1069 static_decl_vfs;
1070 NTSTATUS vfs_streams_depot_init(TALLOC_CTX *ctx)
1071 {
1072         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "streams_depot",
1073                                 &vfs_streams_depot_fns);
1074 }