source3/modules/vfs_streams_xattr.c

   1 /*
   2  * Store streams in xattrs
   3  *
   4  * Copyright (C) Volker Lendecke, 2008
   5  *
   6  * Partly based on James Peach's Darwin module, which is
   7  *
   8  * Copyright (C) James Peach 2006-2007
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 3 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  22  */
  23
  24 #include "includes.h"
  25 #include "smbd/smbd.h"
  26 #include "system/filesys.h"
  27 #include "lib/util/tevent_unix.h"
  28 #include "librpc/gen_ndr/ioctl.h"
  29 #include "hash_inode.h"
  30
  31 #undef DBGC_CLASS
  32 #define DBGC_CLASS DBGC_VFS
  33
  34 struct streams_xattr_config {
  35         const char *prefix;
  36         size_t prefix_len;
  37         bool store_stream_type;
  38 };
  39
  40 struct stream_io {
  41         char *base;
  42         char *xattr_name;
  43         void *fsp_name_ptr;
  44         files_struct *fsp;
  45         vfs_handle_struct *handle;
  46 };
  47
  48 static ssize_t get_xattr_size_fsp(struct files_struct *fsp,
  49                                   const char *xattr_name)
  50 {
  51         NTSTATUS status;
  52         struct ea_struct ea;
  53         ssize_t result;
  54
  55         status = get_ea_value_fsp(talloc_tos(),
  56                                   fsp,
  57                                   xattr_name,
  58                                   &ea);
  59         if (!NT_STATUS_IS_OK(status)) {
  60                 return -1;
  61         }
  62
  63         result = ea.value.length-1;
  64         TALLOC_FREE(ea.value.data);
  65         return result;
  66 }
  67
  68 /**
  69  * Given a stream name, populate xattr_name with the xattr name to use for
  70  * accessing the stream.
  71  */
  72 static NTSTATUS streams_xattr_get_name(vfs_handle_struct *handle,
  73                                        TALLOC_CTX *ctx,
  74                                        const char *stream_name,
  75                                        char **xattr_name)
  76 {
  77         char *sname;
  78         char *stype;
  79         struct streams_xattr_config *config;
  80
  81         SMB_VFS_HANDLE_GET_DATA(handle, config, struct streams_xattr_config,
  82                                 return NT_STATUS_UNSUCCESSFUL);
  83
  84         sname = talloc_strdup(ctx, stream_name + 1);
  85         if (sname == NULL) {
  86                 return NT_STATUS_NO_MEMORY;
  87         }
  88
  89         /*
  90          * With vfs_fruit option "fruit:encoding = native" we're
  91          * already converting stream names that contain illegal NTFS
  92          * characters from their on-the-wire Unicode Private Range
  93          * encoding to their native ASCII representation.
  94          *
  95          * As as result the name of xattrs storing the streams (via
  96          * vfs_streams_xattr) may contain a colon, so we have to use
  97          * strrchr_m() instead of strchr_m() for matching the stream
  98          * type suffix.
  99          *
 100          * In check_path_syntax() we've already ensured the streamname
 101          * we got from the client is valid.
 102          */
 103         stype = strrchr_m(sname, ':');
 104
 105         if (stype) {
 106                 /*
 107                  * We only support one stream type: "$DATA"
 108                  */
 109                 if (strcasecmp_m(stype, ":$DATA") != 0) {
 110                         talloc_free(sname);
 111                         return NT_STATUS_INVALID_PARAMETER;
 112                 }
 113
 114                 /* Split name and type */
 115                 stype[0] = '\0';
 116         }
 117
 118         *xattr_name = talloc_asprintf(ctx, "%s%s%s",
 119                                       config->prefix,
 120                                       sname,
 121                                       config->store_stream_type ? ":$DATA" : "");
 122         if (*xattr_name == NULL) {
 123                 talloc_free(sname);
 124                 return NT_STATUS_NO_MEMORY;
 125         }
 126
 127         DEBUG(10, ("xattr_name: %s, stream_name: %s\n", *xattr_name,
 128                    stream_name));
 129
 130         talloc_free(sname);
 131         return NT_STATUS_OK;
 132 }
 133
 134 static bool streams_xattr_recheck(struct stream_io *sio)
 135 {
 136         NTSTATUS status;
 137         char *xattr_name = NULL;
 138
 139         if (sio->fsp->fsp_name == sio->fsp_name_ptr) {
 140                 return true;
 141         }
 142
 143         if (sio->fsp->fsp_name->stream_name == NULL) {
 144                 /* how can this happen */
 145                 errno = EINVAL;
 146                 return false;
 147         }
 148
 149         status = streams_xattr_get_name(sio->handle, talloc_tos(),
 150                                         sio->fsp->fsp_name->stream_name,
 151                                         &xattr_name);
 152         if (!NT_STATUS_IS_OK(status)) {
 153                 return false;
 154         }
 155
 156         TALLOC_FREE(sio->xattr_name);
 157         TALLOC_FREE(sio->base);
 158         sio->xattr_name = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(sio->handle, sio->fsp),
 159                                         xattr_name);
 160         if (sio->xattr_name == NULL) {
 161                 DBG_DEBUG("sio->xattr_name==NULL\n");
 162                 return false;
 163         }
 164         TALLOC_FREE(xattr_name);
 165
 166         sio->base = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(sio->handle, sio->fsp),
 167                                   sio->fsp->fsp_name->base_name);
 168         if (sio->base == NULL) {
 169                 DBG_DEBUG("sio->base==NULL\n");
 170                 return false;
 171         }
 172
 173         sio->fsp_name_ptr = sio->fsp->fsp_name;
 174
 175         return true;
 176 }
 177
 178 static int streams_xattr_fstat(vfs_handle_struct *handle, files_struct *fsp,
 179                                SMB_STRUCT_STAT *sbuf)
 180 {
 181         int ret = -1;
 182         struct stream_io *io = (struct stream_io *)
 183                 VFS_FETCH_FSP_EXTENSION(handle, fsp);
 184
 185         if (io == NULL || !fsp_is_alternate_stream(fsp)) {
 186                 return SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
 187         }
 188
 189         DBG_DEBUG("streams_xattr_fstat called for %s\n", fsp_str_dbg(io->fsp));
 190
 191         if (!streams_xattr_recheck(io)) {
 192                 return -1;
 193         }
 194
 195         ret = SMB_VFS_NEXT_FSTAT(handle, fsp->base_fsp, sbuf);
 196         if (ret == -1) {
 197                 return -1;
 198         }
 199
 200         sbuf->st_ex_size = get_xattr_size_fsp(fsp->base_fsp,
 201                                               io->xattr_name);
 202         if (sbuf->st_ex_size == -1) {
 203                 SET_STAT_INVALID(*sbuf);
 204                 return -1;
 205         }
 206
 207         DEBUG(10, ("sbuf->st_ex_size = %d\n", (int)sbuf->st_ex_size));
 208
 209         sbuf->st_ex_ino = hash_inode(sbuf, io->xattr_name);
 210         sbuf->st_ex_mode &= ~S_IFMT;
 211         sbuf->st_ex_mode &= ~S_IFDIR;
 212         sbuf->st_ex_mode |= S_IFREG;
 213         sbuf->st_ex_blocks = sbuf->st_ex_size / STAT_ST_BLOCKSIZE + 1;
 214
 215         return 0;
 216 }
 217
 218 static int streams_xattr_stat(vfs_handle_struct *handle,
 219                               struct smb_filename *smb_fname)
 220 {
 221         NTSTATUS status;
 222         int result = -1;
 223         char *xattr_name = NULL;
 224         char *tmp_stream_name = NULL;
 225         struct smb_filename *pathref = NULL;
 226         struct files_struct *fsp = smb_fname->fsp;
 227
 228         if (!is_named_stream(smb_fname)) {
 229                 return SMB_VFS_NEXT_STAT(handle, smb_fname);
 230         }
 231
 232         /* Note if lp_posix_paths() is true, we can never
 233          * get here as is_named_stream() is
 234          * always false. So we never need worry about
 235          * not following links here. */
 236
 237         /* Populate the stat struct with info from the base file. */
 238         tmp_stream_name = smb_fname->stream_name;
 239         smb_fname->stream_name = NULL;
 240         result = SMB_VFS_NEXT_STAT(handle, smb_fname);
 241         smb_fname->stream_name = tmp_stream_name;
 242
 243         if (result == -1) {
 244                 return -1;
 245         }
 246
 247         /* Derive the xattr name to lookup. */
 248         status = streams_xattr_get_name(handle, talloc_tos(),
 249                                         smb_fname->stream_name, &xattr_name);
 250         if (!NT_STATUS_IS_OK(status)) {
 251                 errno = map_errno_from_nt_status(status);
 252                 return -1;
 253         }
 254
 255         /* Augment the base file's stat information before returning. */
 256         if (fsp == NULL) {
 257                 status = synthetic_pathref(talloc_tos(),
 258                                            handle->conn->cwd_fsp,
 259                                            smb_fname->base_name,
 260                                            NULL,
 261                                            NULL,
 262                                            smb_fname->twrp,
 263                                            smb_fname->flags,
 264                                            &pathref);
 265                 if (!NT_STATUS_IS_OK(status)) {
 266                         TALLOC_FREE(xattr_name);
 267                         SET_STAT_INVALID(smb_fname->st);
 268                         errno = ENOENT;
 269                         return -1;
 270                 }
 271                 fsp = pathref->fsp;
 272         } else {
 273                 fsp = fsp->base_fsp;
 274         }
 275
 276         smb_fname->st.st_ex_size = get_xattr_size_fsp(fsp,
 277                                                       xattr_name);
 278         if (smb_fname->st.st_ex_size == -1) {
 279                 TALLOC_FREE(xattr_name);
 280                 TALLOC_FREE(pathref);
 281                 SET_STAT_INVALID(smb_fname->st);
 282                 errno = ENOENT;
 283                 return -1;
 284         }
 285
 286         smb_fname->st.st_ex_ino = hash_inode(&smb_fname->st, xattr_name);
 287         smb_fname->st.st_ex_mode &= ~S_IFMT;
 288         smb_fname->st.st_ex_mode |= S_IFREG;
 289         smb_fname->st.st_ex_blocks =
 290             smb_fname->st.st_ex_size / STAT_ST_BLOCKSIZE + 1;
 291
 292         TALLOC_FREE(xattr_name);
 293         TALLOC_FREE(pathref);
 294         return 0;
 295 }
 296
 297 static int streams_xattr_lstat(vfs_handle_struct *handle,
 298                                struct smb_filename *smb_fname)
 299 {
 300         if (is_named_stream(smb_fname)) {
 301                 /*
 302                  * There can never be EA's on a symlink.
 303                  * Windows will never see a symlink, and
 304                  * in SMB_FILENAME_POSIX_PATH mode we don't
 305                  * allow EA's on a symlink.
 306                  */
 307                 SET_STAT_INVALID(smb_fname->st);
 308                 errno = ENOENT;
 309                 return -1;
 310         }
 311         return SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 312 }
 313
 314 static int streams_xattr_openat(struct vfs_handle_struct *handle,
 315                                 const struct files_struct *dirfsp,
 316                                 const struct smb_filename *smb_fname,
 317                                 files_struct *fsp,
 318                                 const struct vfs_open_how *how)
 319 {
 320         NTSTATUS status;
 321         struct streams_xattr_config *config = NULL;
 322         struct stream_io *sio = NULL;
 323         struct ea_struct ea;
 324         char *xattr_name = NULL;
 325         int fakefd = -1;
 326         bool set_empty_xattr = false;
 327         int ret;
 328
 329         SMB_VFS_HANDLE_GET_DATA(handle, config, struct streams_xattr_config,
 330                                 return -1);
 331
 332         DBG_DEBUG("called for %s with flags 0x%x\n",
 333                   smb_fname_str_dbg(smb_fname),
 334                   how->flags);
 335
 336         if (!is_named_stream(smb_fname)) {
 337                 return SMB_VFS_NEXT_OPENAT(handle,
 338                                            dirfsp,
 339                                            smb_fname,
 340                                            fsp,
 341                                            how);
 342         }
 343
 344         if (how->resolve != 0) {
 345                 errno = ENOSYS;
 346                 return -1;
 347         }
 348
 349         SMB_ASSERT(fsp_is_alternate_stream(fsp));
 350         SMB_ASSERT(dirfsp == NULL);
 351
 352         status = streams_xattr_get_name(handle, talloc_tos(),
 353                                         smb_fname->stream_name, &xattr_name);
 354         if (!NT_STATUS_IS_OK(status)) {
 355                 errno = map_errno_from_nt_status(status);
 356                 goto fail;
 357         }
 358
 359         status = get_ea_value_fsp(talloc_tos(),
 360                                   fsp->base_fsp,
 361                                   xattr_name,
 362                                   &ea);
 363
 364         DBG_DEBUG("get_ea_value_fsp returned %s\n", nt_errstr(status));
 365
 366         if (!NT_STATUS_IS_OK(status)) {
 367                 if (!NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 368                         /*
 369                          * The base file is not there. This is an error even if
 370                          * we got O_CREAT, the higher levels should have created
 371                          * the base file for us.
 372                          */
 373                         DBG_DEBUG("streams_xattr_open: base file %s not around, "
 374                                   "returning ENOENT\n", smb_fname->base_name);
 375                         errno = ENOENT;
 376                         goto fail;
 377                 }
 378
 379                 if (!(how->flags & O_CREAT)) {
 380                         errno = ENOATTR;
 381                         goto fail;
 382                 }
 383
 384                 set_empty_xattr = true;
 385         }
 386
 387         if (how->flags & O_TRUNC) {
 388                 set_empty_xattr = true;
 389         }
 390
 391         if (set_empty_xattr) {
 392                 /*
 393                  * The attribute does not exist or needs to be truncated
 394                  */
 395
 396                 /*
 397                  * Darn, xattrs need at least 1 byte
 398                  */
 399                 char null = '\0';
 400
 401                 DEBUG(10, ("creating or truncating attribute %s on file %s\n",
 402                            xattr_name, smb_fname->base_name));
 403
 404                 ret = SMB_VFS_FSETXATTR(fsp->base_fsp,
 405                                        xattr_name,
 406                                        &null, sizeof(null),
 407                                        how->flags & O_EXCL ? XATTR_CREATE : 0);
 408                 if (ret != 0) {
 409                         goto fail;
 410                 }
 411         }
 412
 413         fakefd = vfs_fake_fd();
 414
 415         sio = VFS_ADD_FSP_EXTENSION(handle, fsp, struct stream_io, NULL);
 416         if (sio == NULL) {
 417                 errno = ENOMEM;
 418                 goto fail;
 419         }
 420
 421         sio->xattr_name = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(handle, fsp),
 422                                         xattr_name);
 423         if (sio->xattr_name == NULL) {
 424                 errno = ENOMEM;
 425                 goto fail;
 426         }
 427
 428         /*
 429          * so->base needs to be a copy of fsp->fsp_name->base_name,
 430          * making it identical to streams_xattr_recheck(). If the
 431          * open is changing directories, fsp->fsp_name->base_name
 432          * will be the full path from the share root, whilst
 433          * smb_fname will be relative to the $cwd.
 434          */
 435         sio->base = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(handle, fsp),
 436                                   fsp->fsp_name->base_name);
 437         if (sio->base == NULL) {
 438                 errno = ENOMEM;
 439                 goto fail;
 440         }
 441
 442         sio->fsp_name_ptr = fsp->fsp_name;
 443         sio->handle = handle;
 444         sio->fsp = fsp;
 445
 446         return fakefd;
 447
 448  fail:
 449         if (fakefd >= 0) {
 450                 vfs_fake_fd_close(fakefd);
 451                 fakefd = -1;
 452         }
 453
 454         return -1;
 455 }
 456
 457 static int streams_xattr_close(vfs_handle_struct *handle,
 458                                files_struct *fsp)
 459 {
 460         int ret;
 461         int fd;
 462
 463         fd = fsp_get_pathref_fd(fsp);
 464
 465         DBG_DEBUG("streams_xattr_close called [%s] fd [%d]\n",
 466                         smb_fname_str_dbg(fsp->fsp_name), fd);
 467
 468         if (!fsp_is_alternate_stream(fsp)) {
 469                 return SMB_VFS_NEXT_CLOSE(handle, fsp);
 470         }
 471
 472         ret = vfs_fake_fd_close(fd);
 473         fsp_set_fd(fsp, -1);
 474
 475         return ret;
 476 }
 477
 478 static int streams_xattr_unlinkat(vfs_handle_struct *handle,
 479                         struct files_struct *dirfsp,
 480                         const struct smb_filename *smb_fname,
 481                         int flags)
 482 {
 483         NTSTATUS status;
 484         int ret = -1;
 485         char *xattr_name = NULL;
 486         struct smb_filename *pathref = NULL;
 487         struct files_struct *fsp = smb_fname->fsp;
 488
 489         if (!is_named_stream(smb_fname)) {
 490                 return SMB_VFS_NEXT_UNLINKAT(handle,
 491                                         dirfsp,
 492                                         smb_fname,
 493                                         flags);
 494         }
 495
 496         /* A stream can never be rmdir'ed */
 497         SMB_ASSERT((flags & AT_REMOVEDIR) == 0);
 498
 499         status = streams_xattr_get_name(handle, talloc_tos(),
 500                                         smb_fname->stream_name, &xattr_name);
 501         if (!NT_STATUS_IS_OK(status)) {
 502                 errno = map_errno_from_nt_status(status);
 503                 goto fail;
 504         }
 505
 506         if (fsp == NULL) {
 507                 status = synthetic_pathref(talloc_tos(),
 508                                         handle->conn->cwd_fsp,
 509                                         smb_fname->base_name,
 510                                         NULL,
 511                                         NULL,
 512                                         smb_fname->twrp,
 513                                         smb_fname->flags,
 514                                         &pathref);
 515                 if (!NT_STATUS_IS_OK(status)) {
 516                         errno = ENOENT;
 517                         goto fail;
 518                 }
 519                 fsp = pathref->fsp;
 520         } else {
 521                 SMB_ASSERT(fsp_is_alternate_stream(smb_fname->fsp));
 522                 fsp = fsp->base_fsp;
 523         }
 524
 525         ret = SMB_VFS_FREMOVEXATTR(fsp, xattr_name);
 526
 527         if ((ret == -1) && (errno == ENOATTR)) {
 528                 errno = ENOENT;
 529                 goto fail;
 530         }
 531
 532         ret = 0;
 533
 534  fail:
 535         TALLOC_FREE(xattr_name);
 536         TALLOC_FREE(pathref);
 537         return ret;
 538 }
 539
 540 static int streams_xattr_renameat(vfs_handle_struct *handle,
 541                                 files_struct *srcfsp,
 542                                 const struct smb_filename *smb_fname_src,
 543                                 files_struct *dstfsp,
 544                                 const struct smb_filename *smb_fname_dst)
 545 {
 546         NTSTATUS status;
 547         int ret = -1;
 548         char *src_xattr_name = NULL;
 549         char *dst_xattr_name = NULL;
 550         bool src_is_stream, dst_is_stream;
 551         ssize_t oret;
 552         ssize_t nret;
 553         struct ea_struct ea;
 554         struct smb_filename *pathref_src = NULL;
 555         struct smb_filename *pathref_dst = NULL;
 556         struct smb_filename *full_src = NULL;
 557         struct smb_filename *full_dst = NULL;
 558
 559         src_is_stream = is_ntfs_stream_smb_fname(smb_fname_src);
 560         dst_is_stream = is_ntfs_stream_smb_fname(smb_fname_dst);
 561
 562         if (!src_is_stream && !dst_is_stream) {
 563                 return SMB_VFS_NEXT_RENAMEAT(handle,
 564                                         srcfsp,
 565                                         smb_fname_src,
 566                                         dstfsp,
 567                                         smb_fname_dst);
 568         }
 569
 570         /* For now don't allow renames from or to the default stream. */
 571         if (is_ntfs_default_stream_smb_fname(smb_fname_src) ||
 572             is_ntfs_default_stream_smb_fname(smb_fname_dst)) {
 573                 errno = ENOSYS;
 574                 goto done;
 575         }
 576
 577         /* Don't rename if the streams are identical. */
 578         if (strcasecmp_m(smb_fname_src->stream_name,
 579                        smb_fname_dst->stream_name) == 0) {
 580                 goto done;
 581         }
 582
 583         /* Get the xattr names. */
 584         status = streams_xattr_get_name(handle, talloc_tos(),
 585                                         smb_fname_src->stream_name,
 586                                         &src_xattr_name);
 587         if (!NT_STATUS_IS_OK(status)) {
 588                 errno = map_errno_from_nt_status(status);
 589                 goto fail;
 590         }
 591         status = streams_xattr_get_name(handle, talloc_tos(),
 592                                         smb_fname_dst->stream_name,
 593                                         &dst_xattr_name);
 594         if (!NT_STATUS_IS_OK(status)) {
 595                 errno = map_errno_from_nt_status(status);
 596                 goto fail;
 597         }
 598
 599         full_src = full_path_from_dirfsp_atname(talloc_tos(),
 600                                                 srcfsp,
 601                                                 smb_fname_src);
 602         if (full_src == NULL) {
 603                 errno = ENOMEM;
 604                 goto fail;
 605         }
 606         full_dst = full_path_from_dirfsp_atname(talloc_tos(),
 607                                                 dstfsp,
 608                                                 smb_fname_dst);
 609         if (full_dst == NULL) {
 610                 errno = ENOMEM;
 611                 goto fail;
 612         }
 613
 614         /* Get a pathref for full_src (base file, no stream name). */
 615         status = synthetic_pathref(talloc_tos(),
 616                                 handle->conn->cwd_fsp,
 617                                 full_src->base_name,
 618                                 NULL,
 619                                 NULL,
 620                                 full_src->twrp,
 621                                 full_src->flags,
 622                                 &pathref_src);
 623         if (!NT_STATUS_IS_OK(status)) {
 624                 errno = ENOENT;
 625                 goto fail;
 626         }
 627
 628         /* Read the old stream from the base file fsp. */
 629         status = get_ea_value_fsp(talloc_tos(),
 630                                   pathref_src->fsp,
 631                                   src_xattr_name,
 632                                   &ea);
 633         if (!NT_STATUS_IS_OK(status)) {
 634                 errno = map_errno_from_nt_status(status);
 635                 goto fail;
 636         }
 637
 638         /* Get a pathref for full_dst (base file, no stream name). */
 639         status = synthetic_pathref(talloc_tos(),
 640                                 handle->conn->cwd_fsp,
 641                                 full_dst->base_name,
 642                                 NULL,
 643                                 NULL,
 644                                 full_dst->twrp,
 645                                 full_dst->flags,
 646                                 &pathref_dst);
 647         if (!NT_STATUS_IS_OK(status)) {
 648                 errno = ENOENT;
 649                 goto fail;
 650         }
 651
 652         /* (Over)write the new stream on the base file fsp. */
 653         nret = SMB_VFS_FSETXATTR(
 654                         pathref_dst->fsp,
 655                         dst_xattr_name,
 656                         ea.value.data,
 657                         ea.value.length,
 658                         0);
 659         if (nret < 0) {
 660                 if (errno == ENOATTR) {
 661                         errno = ENOENT;
 662                 }
 663                 goto fail;
 664         }
 665
 666         /*
 667          * Remove the old stream from the base file fsp.
 668          */
 669         oret = SMB_VFS_FREMOVEXATTR(pathref_src->fsp,
 670                                     src_xattr_name);
 671         if (oret < 0) {
 672                 if (errno == ENOATTR) {
 673                         errno = ENOENT;
 674                 }
 675                 goto fail;
 676         }
 677
 678  done:
 679         errno = 0;
 680         ret = 0;
 681  fail:
 682         TALLOC_FREE(pathref_src);
 683         TALLOC_FREE(pathref_dst);
 684         TALLOC_FREE(full_src);
 685         TALLOC_FREE(full_dst);
 686         TALLOC_FREE(src_xattr_name);
 687         TALLOC_FREE(dst_xattr_name);
 688         return ret;
 689 }
 690
 691 static NTSTATUS walk_xattr_streams(vfs_handle_struct *handle,
 692                                 files_struct *fsp,
 693                                 const struct smb_filename *smb_fname,
 694                                 bool (*fn)(struct ea_struct *ea,
 695                                         void *private_data),
 696                                 void *private_data)
 697 {
 698         NTSTATUS status;
 699         char **names;
 700         size_t i, num_names;
 701         struct streams_xattr_config *config;
 702
 703         SMB_VFS_HANDLE_GET_DATA(handle, config, struct streams_xattr_config,
 704                                 return NT_STATUS_UNSUCCESSFUL);
 705
 706         status = get_ea_names_from_fsp(talloc_tos(),
 707                                 smb_fname->fsp,
 708                                 &names,
 709                                 &num_names);
 710         if (!NT_STATUS_IS_OK(status)) {
 711                 return status;
 712         }
 713
 714         for (i=0; i<num_names; i++) {
 715                 struct ea_struct ea;
 716
 717                 /*
 718                  * We want to check with samba_private_attr_name()
 719                  * whether the xattr name is a private one,
 720                  * unfortunately it flags xattrs that begin with the
 721                  * default streams prefix as private.
 722                  *
 723                  * By only calling samba_private_attr_name() in case
 724                  * the xattr does NOT begin with the default prefix,
 725                  * we know that if it returns 'true' it definitely one
 726                  * of our internal xattr like "user.DOSATTRIB".
 727                  */
 728                 if (strncasecmp_m(names[i], SAMBA_XATTR_DOSSTREAM_PREFIX,
 729                                   strlen(SAMBA_XATTR_DOSSTREAM_PREFIX)) != 0) {
 730                         if (samba_private_attr_name(names[i])) {
 731                                 continue;
 732                         }
 733                 }
 734
 735                 if (strncmp(names[i], config->prefix,
 736                             config->prefix_len) != 0) {
 737                         continue;
 738                 }
 739
 740                 status = get_ea_value_fsp(names,
 741                                           smb_fname->fsp,
 742                                           names[i],
 743                                           &ea);
 744                 if (!NT_STATUS_IS_OK(status)) {
 745                         DEBUG(10, ("Could not get ea %s for file %s: %s\n",
 746                                 names[i],
 747                                 smb_fname->base_name,
 748                                 nt_errstr(status)));
 749                         continue;
 750                 }
 751
 752                 ea.name = talloc_asprintf(
 753                         ea.value.data, ":%s%s",
 754                         names[i] + config->prefix_len,
 755                         config->store_stream_type ? "" : ":$DATA");
 756                 if (ea.name == NULL) {
 757                         DEBUG(0, ("talloc failed\n"));
 758                         continue;
 759                 }
 760
 761                 if (!fn(&ea, private_data)) {
 762                         TALLOC_FREE(ea.value.data);
 763                         return NT_STATUS_OK;
 764                 }
 765
 766                 TALLOC_FREE(ea.value.data);
 767         }
 768
 769         TALLOC_FREE(names);
 770         return NT_STATUS_OK;
 771 }
 772
 773 static bool add_one_stream(TALLOC_CTX *mem_ctx, unsigned int *num_streams,
 774                            struct stream_struct **streams,
 775                            const char *name, off_t size,
 776                            off_t alloc_size)
 777 {
 778         struct stream_struct *tmp;
 779
 780         tmp = talloc_realloc(mem_ctx, *streams, struct stream_struct,
 781                                    (*num_streams)+1);
 782         if (tmp == NULL) {
 783                 return false;
 784         }
 785
 786         tmp[*num_streams].name = talloc_strdup(tmp, name);
 787         if (tmp[*num_streams].name == NULL) {
 788                 return false;
 789         }
 790
 791         tmp[*num_streams].size = size;
 792         tmp[*num_streams].alloc_size = alloc_size;
 793
 794         *streams = tmp;
 795         *num_streams += 1;
 796         return true;
 797 }
 798
 799 struct streaminfo_state {
 800         TALLOC_CTX *mem_ctx;
 801         vfs_handle_struct *handle;
 802         unsigned int num_streams;
 803         struct stream_struct *streams;
 804         NTSTATUS status;
 805 };
 806
 807 static bool collect_one_stream(struct ea_struct *ea, void *private_data)
 808 {
 809         struct streaminfo_state *state =
 810                 (struct streaminfo_state *)private_data;
 811
 812         if (!add_one_stream(state->mem_ctx,
 813                             &state->num_streams, &state->streams,
 814                             ea->name, ea->value.length-1,
 815                             smb_roundup(state->handle->conn,
 816                                         ea->value.length-1))) {
 817                 state->status = NT_STATUS_NO_MEMORY;
 818                 return false;
 819         }
 820
 821         return true;
 822 }
 823
 824 static NTSTATUS streams_xattr_fstreaminfo(vfs_handle_struct *handle,
 825                                          struct files_struct *fsp,
 826                                          TALLOC_CTX *mem_ctx,
 827                                          unsigned int *pnum_streams,
 828                                          struct stream_struct **pstreams)
 829 {
 830         NTSTATUS status;
 831         struct streaminfo_state state;
 832
 833         state.streams = *pstreams;
 834         state.num_streams = *pnum_streams;
 835         state.mem_ctx = mem_ctx;
 836         state.handle = handle;
 837         state.status = NT_STATUS_OK;
 838
 839         status = walk_xattr_streams(handle,
 840                                     fsp,
 841                                     fsp->fsp_name,
 842                                     collect_one_stream,
 843                                     &state);
 844
 845         if (!NT_STATUS_IS_OK(status)) {
 846                 TALLOC_FREE(state.streams);
 847                 return status;
 848         }
 849
 850         if (!NT_STATUS_IS_OK(state.status)) {
 851                 TALLOC_FREE(state.streams);
 852                 return state.status;
 853         }
 854
 855         *pnum_streams = state.num_streams;
 856         *pstreams = state.streams;
 857
 858         return SMB_VFS_NEXT_FSTREAMINFO(handle,
 859                         fsp,
 860                         mem_ctx,
 861                         pnum_streams,
 862                         pstreams);
 863 }
 864
 865 static uint32_t streams_xattr_fs_capabilities(struct vfs_handle_struct *handle,
 866                         enum timestamp_set_resolution *p_ts_res)
 867 {
 868         return SMB_VFS_NEXT_FS_CAPABILITIES(handle, p_ts_res) | FILE_NAMED_STREAMS;
 869 }
 870
 871 static int streams_xattr_connect(vfs_handle_struct *handle,
 872                                  const char *service, const char *user)
 873 {
 874         struct streams_xattr_config *config;
 875         const char *default_prefix = SAMBA_XATTR_DOSSTREAM_PREFIX;
 876         const char *prefix;
 877         int rc;
 878
 879         rc = SMB_VFS_NEXT_CONNECT(handle, service, user);
 880         if (rc != 0) {
 881                 return rc;
 882         }
 883
 884         config = talloc_zero(handle->conn, struct streams_xattr_config);
 885         if (config == NULL) {
 886                 DEBUG(1, ("talloc_zero() failed\n"));
 887                 errno = ENOMEM;
 888                 return -1;
 889         }
 890
 891         prefix = lp_parm_const_string(SNUM(handle->conn),
 892                                       "streams_xattr", "prefix",
 893                                       default_prefix);
 894         config->prefix = talloc_strdup(config, prefix);
 895         if (config->prefix == NULL) {
 896                 DEBUG(1, ("talloc_strdup() failed\n"));
 897                 errno = ENOMEM;
 898                 return -1;
 899         }
 900         config->prefix_len = strlen(config->prefix);
 901         DEBUG(10, ("streams_xattr using stream prefix: %s\n", config->prefix));
 902
 903         config->store_stream_type = lp_parm_bool(SNUM(handle->conn),
 904                                                  "streams_xattr",
 905                                                  "store_stream_type",
 906                                                  true);
 907
 908         SMB_VFS_HANDLE_SET_DATA(handle, config,
 909                                 NULL, struct stream_xattr_config,
 910                                 return -1);
 911
 912         return 0;
 913 }
 914
 915 static ssize_t streams_xattr_pwrite(vfs_handle_struct *handle,
 916                                     files_struct *fsp, const void *data,
 917                                     size_t n, off_t offset)
 918 {
 919         struct stream_io *sio =
 920                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
 921         struct ea_struct ea;
 922         NTSTATUS status;
 923         int ret;
 924
 925         DEBUG(10, ("streams_xattr_pwrite called for %d bytes\n", (int)n));
 926
 927         if (sio == NULL) {
 928                 return SMB_VFS_NEXT_PWRITE(handle, fsp, data, n, offset);
 929         }
 930
 931         if (!streams_xattr_recheck(sio)) {
 932                 return -1;
 933         }
 934
 935         if ((offset + n) >= lp_smbd_max_xattr_size(SNUM(handle->conn))) {
 936                 /*
 937                  * Requested write is beyond what can be read based on
 938                  * samba configuration.
 939                  * ReFS returns STATUS_FILESYSTEM_LIMITATION, which causes
 940                  * entire file to be skipped by File Explorer. VFAT returns
 941                  * NT_STATUS_OBJECT_NAME_COLLISION causes user to be prompted
 942                  * to skip writing metadata, but copy data.
 943                  */
 944                 DBG_ERR("Write to xattr [%s] on file [%s] exceeds maximum "
 945                         "supported extended attribute size. "
 946                         "Depending on filesystem type and operating system "
 947                         "(OS) specifics, this value may be increased using "
 948                         "the value of the parameter: "
 949                         "smbd max xattr size = <bytes>. Consult OS and "
 950                         "filesystem manpages prior to increasing this limit.\n",
 951                         sio->xattr_name, sio->base);
 952                 errno = EOVERFLOW;
 953                 return -1;
 954         }
 955
 956         status = get_ea_value_fsp(talloc_tos(),
 957                                   fsp->base_fsp,
 958                                   sio->xattr_name,
 959                                   &ea);
 960         if (!NT_STATUS_IS_OK(status)) {
 961                 return -1;
 962         }
 963
 964         if ((offset + n) > ea.value.length-1) {
 965                 uint8_t *tmp;
 966
 967                 tmp = talloc_realloc(talloc_tos(), ea.value.data, uint8_t,
 968                                            offset + n + 1);
 969
 970                 if (tmp == NULL) {
 971                         TALLOC_FREE(ea.value.data);
 972                         errno = ENOMEM;
 973                         return -1;
 974                 }
 975                 ea.value.data = tmp;
 976                 ea.value.length = offset + n + 1;
 977                 ea.value.data[offset+n] = 0;
 978         }
 979
 980         memcpy(ea.value.data + offset, data, n);
 981
 982         ret = SMB_VFS_FSETXATTR(fsp->base_fsp,
 983                                 sio->xattr_name,
 984                                 ea.value.data,
 985                                 ea.value.length,
 986                                 0);
 987         TALLOC_FREE(ea.value.data);
 988
 989         if (ret == -1) {
 990                 return -1;
 991         }
 992
 993         return n;
 994 }
 995
 996 static ssize_t streams_xattr_pread(vfs_handle_struct *handle,
 997                                    files_struct *fsp, void *data,
 998                                    size_t n, off_t offset)
 999 {
1000         struct stream_io *sio =
1001                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1002         struct ea_struct ea;
1003         NTSTATUS status;
1004         size_t length, overlap;
1005
1006         DEBUG(10, ("streams_xattr_pread: offset=%d, size=%d\n",
1007                    (int)offset, (int)n));
1008
1009         if (sio == NULL) {
1010                 return SMB_VFS_NEXT_PREAD(handle, fsp, data, n, offset);
1011         }
1012
1013         if (!streams_xattr_recheck(sio)) {
1014                 return -1;
1015         }
1016
1017         status = get_ea_value_fsp(talloc_tos(),
1018                                   fsp->base_fsp,
1019                                   sio->xattr_name,
1020                                   &ea);
1021         if (!NT_STATUS_IS_OK(status)) {
1022                 return -1;
1023         }
1024
1025         length = ea.value.length-1;
1026
1027         DBG_DEBUG("get_ea_value_fsp returned %d bytes\n",
1028                    (int)length);
1029
1030         /* Attempt to read past EOF. */
1031         if (length <= offset) {
1032                 return 0;
1033         }
1034
1035         overlap = (offset + n) > length ? (length - offset) : n;
1036         memcpy(data, ea.value.data + offset, overlap);
1037
1038         TALLOC_FREE(ea.value.data);
1039         return overlap;
1040 }
1041
1042 struct streams_xattr_pread_state {
1043         ssize_t nread;
1044         struct vfs_aio_state vfs_aio_state;
1045 };
1046
1047 static void streams_xattr_pread_done(struct tevent_req *subreq);
1048
1049 static struct tevent_req *streams_xattr_pread_send(
1050         struct vfs_handle_struct *handle,
1051         TALLOC_CTX *mem_ctx,
1052         struct tevent_context *ev,
1053         struct files_struct *fsp,
1054         void *data,
1055         size_t n, off_t offset)
1056 {
1057         struct tevent_req *req = NULL;
1058         struct tevent_req *subreq = NULL;
1059         struct streams_xattr_pread_state *state = NULL;
1060         struct stream_io *sio =
1061                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1062
1063         req = tevent_req_create(mem_ctx, &state,
1064                                 struct streams_xattr_pread_state);
1065         if (req == NULL) {
1066                 return NULL;
1067         }
1068
1069         if (sio == NULL) {
1070                 subreq = SMB_VFS_NEXT_PREAD_SEND(state, ev, handle, fsp,
1071                                                  data, n, offset);
1072                 if (tevent_req_nomem(req, subreq)) {
1073                         return tevent_req_post(req, ev);
1074                 }
1075                 tevent_req_set_callback(subreq, streams_xattr_pread_done, req);
1076                 return req;
1077         }
1078
1079         state->nread = SMB_VFS_PREAD(fsp, data, n, offset);
1080         if (state->nread != n) {
1081                 if (state->nread != -1) {
1082                         errno = EIO;
1083                 }
1084                 tevent_req_error(req, errno);
1085                 return tevent_req_post(req, ev);
1086         }
1087
1088         tevent_req_done(req);
1089         return tevent_req_post(req, ev);
1090 }
1091
1092 static void streams_xattr_pread_done(struct tevent_req *subreq)
1093 {
1094         struct tevent_req *req = tevent_req_callback_data(
1095                 subreq, struct tevent_req);
1096         struct streams_xattr_pread_state *state = tevent_req_data(
1097                 req, struct streams_xattr_pread_state);
1098
1099         state->nread = SMB_VFS_PREAD_RECV(subreq, &state->vfs_aio_state);
1100         TALLOC_FREE(subreq);
1101
1102         if (tevent_req_error(req, state->vfs_aio_state.error)) {
1103                 return;
1104         }
1105         tevent_req_done(req);
1106 }
1107
1108 static ssize_t streams_xattr_pread_recv(struct tevent_req *req,
1109                                         struct vfs_aio_state *vfs_aio_state)
1110 {
1111         struct streams_xattr_pread_state *state = tevent_req_data(
1112                 req, struct streams_xattr_pread_state);
1113
1114         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
1115                 return -1;
1116         }
1117
1118         *vfs_aio_state = state->vfs_aio_state;
1119         return state->nread;
1120 }
1121
1122 struct streams_xattr_pwrite_state {
1123         ssize_t nwritten;
1124         struct vfs_aio_state vfs_aio_state;
1125 };
1126
1127 static void streams_xattr_pwrite_done(struct tevent_req *subreq);
1128
1129 static struct tevent_req *streams_xattr_pwrite_send(
1130         struct vfs_handle_struct *handle,
1131         TALLOC_CTX *mem_ctx,
1132         struct tevent_context *ev,
1133         struct files_struct *fsp,
1134         const void *data,
1135         size_t n, off_t offset)
1136 {
1137         struct tevent_req *req = NULL;
1138         struct tevent_req *subreq = NULL;
1139         struct streams_xattr_pwrite_state *state = NULL;
1140         struct stream_io *sio =
1141                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1142
1143         req = tevent_req_create(mem_ctx, &state,
1144                                 struct streams_xattr_pwrite_state);
1145         if (req == NULL) {
1146                 return NULL;
1147         }
1148
1149         if (sio == NULL) {
1150                 subreq = SMB_VFS_NEXT_PWRITE_SEND(state, ev, handle, fsp,
1151                                                   data, n, offset);
1152                 if (tevent_req_nomem(req, subreq)) {
1153                         return tevent_req_post(req, ev);
1154                 }
1155                 tevent_req_set_callback(subreq, streams_xattr_pwrite_done, req);
1156                 return req;
1157         }
1158
1159         state->nwritten = SMB_VFS_PWRITE(fsp, data, n, offset);
1160         if (state->nwritten != n) {
1161                 if (state->nwritten != -1) {
1162                         errno = EIO;
1163                 }
1164                 tevent_req_error(req, errno);
1165                 return tevent_req_post(req, ev);
1166         }
1167
1168         tevent_req_done(req);
1169         return tevent_req_post(req, ev);
1170 }
1171
1172 static void streams_xattr_pwrite_done(struct tevent_req *subreq)
1173 {
1174         struct tevent_req *req = tevent_req_callback_data(
1175                 subreq, struct tevent_req);
1176         struct streams_xattr_pwrite_state *state = tevent_req_data(
1177                 req, struct streams_xattr_pwrite_state);
1178
1179         state->nwritten = SMB_VFS_PWRITE_RECV(subreq, &state->vfs_aio_state);
1180         TALLOC_FREE(subreq);
1181
1182         if (tevent_req_error(req, state->vfs_aio_state.error)) {
1183                 return;
1184         }
1185         tevent_req_done(req);
1186 }
1187
1188 static ssize_t streams_xattr_pwrite_recv(struct tevent_req *req,
1189                                          struct vfs_aio_state *vfs_aio_state)
1190 {
1191         struct streams_xattr_pwrite_state *state = tevent_req_data(
1192                 req, struct streams_xattr_pwrite_state);
1193
1194         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
1195                 return -1;
1196         }
1197
1198         *vfs_aio_state = state->vfs_aio_state;
1199         return state->nwritten;
1200 }
1201
1202 static int streams_xattr_ftruncate(struct vfs_handle_struct *handle,
1203                                         struct files_struct *fsp,
1204                                         off_t offset)
1205 {
1206         int ret;
1207         uint8_t *tmp;
1208         struct ea_struct ea;
1209         NTSTATUS status;
1210         struct stream_io *sio =
1211                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1212
1213         DEBUG(10, ("streams_xattr_ftruncate called for file %s offset %.0f\n",
1214                    fsp_str_dbg(fsp), (double)offset));
1215
1216         if (sio == NULL) {
1217                 return SMB_VFS_NEXT_FTRUNCATE(handle, fsp, offset);
1218         }
1219
1220         if (!streams_xattr_recheck(sio)) {
1221                 return -1;
1222         }
1223
1224         status = get_ea_value_fsp(talloc_tos(),
1225                                   fsp->base_fsp,
1226                                   sio->xattr_name,
1227                                   &ea);
1228         if (!NT_STATUS_IS_OK(status)) {
1229                 return -1;
1230         }
1231
1232         tmp = talloc_realloc(talloc_tos(), ea.value.data, uint8_t,
1233                                    offset + 1);
1234
1235         if (tmp == NULL) {
1236                 TALLOC_FREE(ea.value.data);
1237                 errno = ENOMEM;
1238                 return -1;
1239         }
1240
1241         /* Did we expand ? */
1242         if (ea.value.length < offset + 1) {
1243                 memset(&tmp[ea.value.length], '\0',
1244                         offset + 1 - ea.value.length);
1245         }
1246
1247         ea.value.data = tmp;
1248         ea.value.length = offset + 1;
1249         ea.value.data[offset] = 0;
1250
1251         ret = SMB_VFS_FSETXATTR(fsp->base_fsp,
1252                                 sio->xattr_name,
1253                                 ea.value.data,
1254                                 ea.value.length,
1255                                 0);
1256
1257         TALLOC_FREE(ea.value.data);
1258
1259         if (ret == -1) {
1260                 return -1;
1261         }
1262
1263         return 0;
1264 }
1265
1266 static int streams_xattr_fallocate(struct vfs_handle_struct *handle,
1267                                         struct files_struct *fsp,
1268                                         uint32_t mode,
1269                                         off_t offset,
1270                                         off_t len)
1271 {
1272         struct stream_io *sio =
1273                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1274
1275         DEBUG(10, ("streams_xattr_fallocate called for file %s offset %.0f"
1276                 "len = %.0f\n",
1277                 fsp_str_dbg(fsp), (double)offset, (double)len));
1278
1279         if (sio == NULL) {
1280                 return SMB_VFS_NEXT_FALLOCATE(handle, fsp, mode, offset, len);
1281         }
1282
1283         if (!streams_xattr_recheck(sio)) {
1284                 return -1;
1285         }
1286
1287         /* Let the pwrite code path handle it. */
1288         errno = ENOSYS;
1289         return -1;
1290 }
1291
1292 static int streams_xattr_fchown(vfs_handle_struct *handle, files_struct *fsp,
1293                                 uid_t uid, gid_t gid)
1294 {
1295         struct stream_io *sio =
1296                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1297
1298         if (sio == NULL) {
1299                 return SMB_VFS_NEXT_FCHOWN(handle, fsp, uid, gid);
1300         }
1301
1302         return 0;
1303 }
1304
1305 static int streams_xattr_fchmod(vfs_handle_struct *handle,
1306                                 files_struct *fsp,
1307                                 mode_t mode)
1308 {
1309         struct stream_io *sio =
1310                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1311
1312         if (sio == NULL) {
1313                 return SMB_VFS_NEXT_FCHMOD(handle, fsp, mode);
1314         }
1315
1316         return 0;
1317 }
1318
1319 static ssize_t streams_xattr_fgetxattr(struct vfs_handle_struct *handle,
1320                                        struct files_struct *fsp,
1321                                        const char *name,
1322                                        void *value,
1323                                        size_t size)
1324 {
1325         struct stream_io *sio =
1326                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1327
1328         if (sio == NULL) {
1329                 return SMB_VFS_NEXT_FGETXATTR(handle, fsp, name, value, size);
1330         }
1331
1332         errno = ENOTSUP;
1333         return -1;
1334 }
1335
1336 static ssize_t streams_xattr_flistxattr(struct vfs_handle_struct *handle,
1337                                         struct files_struct *fsp,
1338                                         char *list,
1339                                         size_t size)
1340 {
1341         struct stream_io *sio =
1342                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1343
1344         if (sio == NULL) {
1345                 return SMB_VFS_NEXT_FLISTXATTR(handle, fsp, list, size);
1346         }
1347
1348         errno = ENOTSUP;
1349         return -1;
1350 }
1351
1352 static int streams_xattr_fremovexattr(struct vfs_handle_struct *handle,
1353                                       struct files_struct *fsp,
1354                                       const char *name)
1355 {
1356         struct stream_io *sio =
1357                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1358
1359         if (sio == NULL) {
1360                 return SMB_VFS_NEXT_FREMOVEXATTR(handle, fsp, name);
1361         }
1362
1363         errno = ENOTSUP;
1364         return -1;
1365 }
1366
1367 static int streams_xattr_fsetxattr(struct vfs_handle_struct *handle,
1368                                    struct files_struct *fsp,
1369                                    const char *name,
1370                                    const void *value,
1371                                    size_t size,
1372                                    int flags)
1373 {
1374         struct stream_io *sio =
1375                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1376
1377         if (sio == NULL) {
1378                 return SMB_VFS_NEXT_FSETXATTR(handle, fsp, name, value,
1379                                               size, flags);
1380         }
1381
1382         errno = ENOTSUP;
1383         return -1;
1384 }
1385
1386 struct streams_xattr_fsync_state {
1387         int ret;
1388         struct vfs_aio_state vfs_aio_state;
1389 };
1390
1391 static void streams_xattr_fsync_done(struct tevent_req *subreq);
1392
1393 static struct tevent_req *streams_xattr_fsync_send(
1394         struct vfs_handle_struct *handle,
1395         TALLOC_CTX *mem_ctx,
1396         struct tevent_context *ev,
1397         struct files_struct *fsp)
1398 {
1399         struct tevent_req *req = NULL;
1400         struct tevent_req *subreq = NULL;
1401         struct streams_xattr_fsync_state *state = NULL;
1402         struct stream_io *sio =
1403                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1404
1405         req = tevent_req_create(mem_ctx, &state,
1406                                 struct streams_xattr_fsync_state);
1407         if (req == NULL) {
1408                 return NULL;
1409         }
1410
1411         if (sio == NULL) {
1412                 subreq = SMB_VFS_NEXT_FSYNC_SEND(state, ev, handle, fsp);
1413                 if (tevent_req_nomem(req, subreq)) {
1414                         return tevent_req_post(req, ev);
1415                 }
1416                 tevent_req_set_callback(subreq, streams_xattr_fsync_done, req);
1417                 return req;
1418         }
1419
1420         /*
1421          * There's no pathname based sync variant and we don't have access to
1422          * the basefile handle, so we can't do anything here.
1423          */
1424
1425         tevent_req_done(req);
1426         return tevent_req_post(req, ev);
1427 }
1428
1429 static void streams_xattr_fsync_done(struct tevent_req *subreq)
1430 {
1431         struct tevent_req *req = tevent_req_callback_data(
1432                 subreq, struct tevent_req);
1433         struct streams_xattr_fsync_state *state = tevent_req_data(
1434                 req, struct streams_xattr_fsync_state);
1435
1436         state->ret = SMB_VFS_FSYNC_RECV(subreq, &state->vfs_aio_state);
1437         TALLOC_FREE(subreq);
1438         if (state->ret != 0) {
1439                 tevent_req_error(req, errno);
1440                 return;
1441         }
1442
1443         tevent_req_done(req);
1444 }
1445
1446 static int streams_xattr_fsync_recv(struct tevent_req *req,
1447                                     struct vfs_aio_state *vfs_aio_state)
1448 {
1449         struct streams_xattr_fsync_state *state = tevent_req_data(
1450                 req, struct streams_xattr_fsync_state);
1451
1452         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
1453                 return -1;
1454         }
1455
1456         *vfs_aio_state = state->vfs_aio_state;
1457         return state->ret;
1458 }
1459
1460 static bool streams_xattr_lock(vfs_handle_struct *handle,
1461                                files_struct *fsp,
1462                                int op,
1463                                off_t offset,
1464                                off_t count,
1465                                int type)
1466 {
1467         struct stream_io *sio =
1468                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1469
1470         if (sio == NULL) {
1471                 return SMB_VFS_NEXT_LOCK(handle, fsp, op, offset, count, type);
1472         }
1473
1474         return true;
1475 }
1476
1477 static bool streams_xattr_getlock(vfs_handle_struct *handle,
1478                                   files_struct *fsp,
1479                                   off_t *poffset,
1480                                   off_t *pcount,
1481                                   int *ptype,
1482                                   pid_t *ppid)
1483 {
1484         struct stream_io *sio =
1485                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1486
1487         if (sio == NULL) {
1488                 return SMB_VFS_NEXT_GETLOCK(handle, fsp, poffset,
1489                                             pcount, ptype, ppid);
1490         }
1491
1492         errno = ENOTSUP;
1493         return false;
1494 }
1495
1496 static int streams_xattr_filesystem_sharemode(vfs_handle_struct *handle,
1497                                               files_struct *fsp,
1498                                               uint32_t share_access,
1499                                               uint32_t access_mask)
1500 {
1501         struct stream_io *sio =
1502                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1503
1504         if (sio == NULL) {
1505                 return SMB_VFS_NEXT_FILESYSTEM_SHAREMODE(handle,
1506                                                          fsp,
1507                                                          share_access,
1508                                                          access_mask);
1509         }
1510
1511         return 0;
1512 }
1513
1514 static int streams_xattr_linux_setlease(vfs_handle_struct *handle,
1515                                         files_struct *fsp,
1516                                         int leasetype)
1517 {
1518         struct stream_io *sio =
1519                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1520
1521         if (sio == NULL) {
1522                 return SMB_VFS_NEXT_LINUX_SETLEASE(handle, fsp, leasetype);
1523         }
1524
1525         return 0;
1526 }
1527
1528 static bool streams_xattr_strict_lock_check(struct vfs_handle_struct *handle,
1529                                             files_struct *fsp,
1530                                             struct lock_struct *plock)
1531 {
1532         struct stream_io *sio =
1533                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1534
1535         if (sio == NULL) {
1536                 return SMB_VFS_NEXT_STRICT_LOCK_CHECK(handle, fsp, plock);
1537         }
1538
1539         return true;
1540 }
1541
1542 static struct vfs_fn_pointers vfs_streams_xattr_fns = {
1543         .fs_capabilities_fn = streams_xattr_fs_capabilities,
1544         .connect_fn = streams_xattr_connect,
1545         .openat_fn = streams_xattr_openat,
1546         .close_fn = streams_xattr_close,
1547         .stat_fn = streams_xattr_stat,
1548         .fstat_fn = streams_xattr_fstat,
1549         .lstat_fn = streams_xattr_lstat,
1550         .pread_fn = streams_xattr_pread,
1551         .pwrite_fn = streams_xattr_pwrite,
1552         .pread_send_fn = streams_xattr_pread_send,
1553         .pread_recv_fn = streams_xattr_pread_recv,
1554         .pwrite_send_fn = streams_xattr_pwrite_send,
1555         .pwrite_recv_fn = streams_xattr_pwrite_recv,
1556         .unlinkat_fn = streams_xattr_unlinkat,
1557         .renameat_fn = streams_xattr_renameat,
1558         .ftruncate_fn = streams_xattr_ftruncate,
1559         .fallocate_fn = streams_xattr_fallocate,
1560         .fstreaminfo_fn = streams_xattr_fstreaminfo,
1561
1562         .fsync_send_fn = streams_xattr_fsync_send,
1563         .fsync_recv_fn = streams_xattr_fsync_recv,
1564
1565         .lock_fn = streams_xattr_lock,
1566         .getlock_fn = streams_xattr_getlock,
1567         .filesystem_sharemode_fn = streams_xattr_filesystem_sharemode,
1568         .linux_setlease_fn = streams_xattr_linux_setlease,
1569         .strict_lock_check_fn = streams_xattr_strict_lock_check,
1570
1571         .fchown_fn = streams_xattr_fchown,
1572         .fchmod_fn = streams_xattr_fchmod,
1573
1574         .fgetxattr_fn = streams_xattr_fgetxattr,
1575         .flistxattr_fn = streams_xattr_flistxattr,
1576         .fremovexattr_fn = streams_xattr_fremovexattr,
1577         .fsetxattr_fn = streams_xattr_fsetxattr,
1578 };
1579
1580 static_decl_vfs;
1581 NTSTATUS vfs_streams_xattr_init(TALLOC_CTX *ctx)
1582 {
1583         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "streams_xattr",
1584                                 &vfs_streams_xattr_fns);
1585 }