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         size_t stream_name_len = strlen(stream_name);
  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         SMB_ASSERT(stream_name[0] == ':');
  85         stream_name += 1;
  86
  87         /*
  88          * With vfs_fruit option "fruit:encoding = native" we're
  89          * already converting stream names that contain illegal NTFS
  90          * characters from their on-the-wire Unicode Private Range
  91          * encoding to their native ASCII representation.
  92          *
  93          * As as result the name of xattrs storing the streams (via
  94          * vfs_streams_xattr) may contain a colon, so we have to use
  95          * strrchr_m() instead of strchr_m() for matching the stream
  96          * type suffix.
  97          *
  98          * In check_path_syntax() we've already ensured the streamname
  99          * we got from the client is valid.
 100          */
 101         stype = strrchr_m(stream_name, ':');
 102
 103         if (stype) {
 104                 /*
 105                  * We only support one stream type: "$DATA"
 106                  */
 107                 if (strcasecmp_m(stype, ":$DATA") != 0) {
 108                         return NT_STATUS_INVALID_PARAMETER;
 109                 }
 110
 111                 /* Split name and type */
 112                 stream_name_len = (stype - stream_name);
 113         }
 114
 115         *xattr_name = talloc_asprintf(ctx, "%s%.*s%s",
 116                                       config->prefix,
 117                                       (int)stream_name_len,
 118                                       stream_name,
 119                                       config->store_stream_type ? ":$DATA" : "");
 120         if (*xattr_name == NULL) {
 121                 return NT_STATUS_NO_MEMORY;
 122         }
 123
 124         DEBUG(10, ("xattr_name: %s, stream_name: %s\n", *xattr_name,
 125                    stream_name));
 126
 127         return NT_STATUS_OK;
 128 }
 129
 130 static bool streams_xattr_recheck(struct stream_io *sio)
 131 {
 132         NTSTATUS status;
 133         char *xattr_name = NULL;
 134
 135         if (sio->fsp->fsp_name == sio->fsp_name_ptr) {
 136                 return true;
 137         }
 138
 139         if (sio->fsp->fsp_name->stream_name == NULL) {
 140                 /* how can this happen */
 141                 errno = EINVAL;
 142                 return false;
 143         }
 144
 145         status = streams_xattr_get_name(sio->handle, talloc_tos(),
 146                                         sio->fsp->fsp_name->stream_name,
 147                                         &xattr_name);
 148         if (!NT_STATUS_IS_OK(status)) {
 149                 return false;
 150         }
 151
 152         TALLOC_FREE(sio->xattr_name);
 153         TALLOC_FREE(sio->base);
 154         sio->xattr_name = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(sio->handle, sio->fsp),
 155                                         xattr_name);
 156         if (sio->xattr_name == NULL) {
 157                 DBG_DEBUG("sio->xattr_name==NULL\n");
 158                 return false;
 159         }
 160         TALLOC_FREE(xattr_name);
 161
 162         sio->base = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(sio->handle, sio->fsp),
 163                                   sio->fsp->fsp_name->base_name);
 164         if (sio->base == NULL) {
 165                 DBG_DEBUG("sio->base==NULL\n");
 166                 return false;
 167         }
 168
 169         sio->fsp_name_ptr = sio->fsp->fsp_name;
 170
 171         return true;
 172 }
 173
 174 static int streams_xattr_fstat(vfs_handle_struct *handle, files_struct *fsp,
 175                                SMB_STRUCT_STAT *sbuf)
 176 {
 177         int ret = -1;
 178         struct stream_io *io = (struct stream_io *)
 179                 VFS_FETCH_FSP_EXTENSION(handle, fsp);
 180
 181         if (io == NULL || !fsp_is_alternate_stream(fsp)) {
 182                 return SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
 183         }
 184
 185         DBG_DEBUG("streams_xattr_fstat called for %s\n", fsp_str_dbg(io->fsp));
 186
 187         if (!streams_xattr_recheck(io)) {
 188                 return -1;
 189         }
 190
 191         ret = SMB_VFS_NEXT_FSTAT(handle, fsp->base_fsp, sbuf);
 192         if (ret == -1) {
 193                 return -1;
 194         }
 195
 196         sbuf->st_ex_size = get_xattr_size_fsp(fsp->base_fsp,
 197                                               io->xattr_name);
 198         if (sbuf->st_ex_size == -1) {
 199                 SET_STAT_INVALID(*sbuf);
 200                 return -1;
 201         }
 202
 203         DEBUG(10, ("sbuf->st_ex_size = %d\n", (int)sbuf->st_ex_size));
 204
 205         sbuf->st_ex_ino = hash_inode(sbuf, io->xattr_name);
 206         sbuf->st_ex_mode &= ~S_IFMT;
 207         sbuf->st_ex_mode &= ~S_IFDIR;
 208         sbuf->st_ex_mode |= S_IFREG;
 209         sbuf->st_ex_blocks = sbuf->st_ex_size / STAT_ST_BLOCKSIZE + 1;
 210
 211         return 0;
 212 }
 213
 214 static int streams_xattr_stat(vfs_handle_struct *handle,
 215                               struct smb_filename *smb_fname)
 216 {
 217         NTSTATUS status;
 218         int result = -1;
 219         char *xattr_name = NULL;
 220         char *tmp_stream_name = NULL;
 221         struct smb_filename *pathref = NULL;
 222         struct files_struct *fsp = smb_fname->fsp;
 223
 224         if (!is_named_stream(smb_fname)) {
 225                 return SMB_VFS_NEXT_STAT(handle, smb_fname);
 226         }
 227
 228         /* Note if lp_posix_paths() is true, we can never
 229          * get here as is_named_stream() is
 230          * always false. So we never need worry about
 231          * not following links here. */
 232
 233         /* Populate the stat struct with info from the base file. */
 234         tmp_stream_name = smb_fname->stream_name;
 235         smb_fname->stream_name = NULL;
 236         result = SMB_VFS_NEXT_STAT(handle, smb_fname);
 237         smb_fname->stream_name = tmp_stream_name;
 238
 239         if (result == -1) {
 240                 return -1;
 241         }
 242
 243         /* Derive the xattr name to lookup. */
 244         status = streams_xattr_get_name(handle, talloc_tos(),
 245                                         smb_fname->stream_name, &xattr_name);
 246         if (!NT_STATUS_IS_OK(status)) {
 247                 errno = map_errno_from_nt_status(status);
 248                 return -1;
 249         }
 250
 251         /* Augment the base file's stat information before returning. */
 252         if (fsp == NULL) {
 253                 status = synthetic_pathref(talloc_tos(),
 254                                            handle->conn->cwd_fsp,
 255                                            smb_fname->base_name,
 256                                            NULL,
 257                                            NULL,
 258                                            smb_fname->twrp,
 259                                            smb_fname->flags,
 260                                            &pathref);
 261                 if (!NT_STATUS_IS_OK(status)) {
 262                         TALLOC_FREE(xattr_name);
 263                         SET_STAT_INVALID(smb_fname->st);
 264                         errno = ENOENT;
 265                         return -1;
 266                 }
 267                 fsp = pathref->fsp;
 268         } else {
 269                 fsp = fsp->base_fsp;
 270         }
 271
 272         smb_fname->st.st_ex_size = get_xattr_size_fsp(fsp,
 273                                                       xattr_name);
 274         if (smb_fname->st.st_ex_size == -1) {
 275                 TALLOC_FREE(xattr_name);
 276                 TALLOC_FREE(pathref);
 277                 SET_STAT_INVALID(smb_fname->st);
 278                 errno = ENOENT;
 279                 return -1;
 280         }
 281
 282         smb_fname->st.st_ex_ino = hash_inode(&smb_fname->st, xattr_name);
 283         smb_fname->st.st_ex_mode &= ~S_IFMT;
 284         smb_fname->st.st_ex_mode |= S_IFREG;
 285         smb_fname->st.st_ex_blocks =
 286             smb_fname->st.st_ex_size / STAT_ST_BLOCKSIZE + 1;
 287
 288         TALLOC_FREE(xattr_name);
 289         TALLOC_FREE(pathref);
 290         return 0;
 291 }
 292
 293 static int streams_xattr_lstat(vfs_handle_struct *handle,
 294                                struct smb_filename *smb_fname)
 295 {
 296         if (is_named_stream(smb_fname)) {
 297                 /*
 298                  * There can never be EA's on a symlink.
 299                  * Windows will never see a symlink, and
 300                  * in SMB_FILENAME_POSIX_PATH mode we don't
 301                  * allow EA's on a symlink.
 302                  */
 303                 SET_STAT_INVALID(smb_fname->st);
 304                 errno = ENOENT;
 305                 return -1;
 306         }
 307         return SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 308 }
 309
 310 static int streams_xattr_openat(struct vfs_handle_struct *handle,
 311                                 const struct files_struct *dirfsp,
 312                                 const struct smb_filename *smb_fname,
 313                                 files_struct *fsp,
 314                                 const struct vfs_open_how *how)
 315 {
 316         NTSTATUS status;
 317         struct streams_xattr_config *config = NULL;
 318         struct stream_io *sio = NULL;
 319         struct ea_struct ea;
 320         char *xattr_name = NULL;
 321         int fakefd = -1;
 322         bool set_empty_xattr = false;
 323         int ret;
 324
 325         SMB_VFS_HANDLE_GET_DATA(handle, config, struct streams_xattr_config,
 326                                 return -1);
 327
 328         DBG_DEBUG("called for %s with flags 0x%x\n",
 329                   smb_fname_str_dbg(smb_fname),
 330                   how->flags);
 331
 332         if (!is_named_stream(smb_fname)) {
 333                 return SMB_VFS_NEXT_OPENAT(handle,
 334                                            dirfsp,
 335                                            smb_fname,
 336                                            fsp,
 337                                            how);
 338         }
 339
 340         if (how->resolve != 0) {
 341                 errno = ENOSYS;
 342                 return -1;
 343         }
 344
 345         SMB_ASSERT(fsp_is_alternate_stream(fsp));
 346         SMB_ASSERT(dirfsp == NULL);
 347
 348         status = streams_xattr_get_name(handle, talloc_tos(),
 349                                         smb_fname->stream_name, &xattr_name);
 350         if (!NT_STATUS_IS_OK(status)) {
 351                 errno = map_errno_from_nt_status(status);
 352                 goto fail;
 353         }
 354
 355         status = get_ea_value_fsp(talloc_tos(),
 356                                   fsp->base_fsp,
 357                                   xattr_name,
 358                                   &ea);
 359
 360         DBG_DEBUG("get_ea_value_fsp returned %s\n", nt_errstr(status));
 361
 362         if (!NT_STATUS_IS_OK(status)) {
 363                 if (!NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 364                         /*
 365                          * The base file is not there. This is an error even if
 366                          * we got O_CREAT, the higher levels should have created
 367                          * the base file for us.
 368                          */
 369                         DBG_DEBUG("streams_xattr_open: base file %s not around, "
 370                                   "returning ENOENT\n", smb_fname->base_name);
 371                         errno = ENOENT;
 372                         goto fail;
 373                 }
 374
 375                 if (!(how->flags & O_CREAT)) {
 376                         errno = ENOATTR;
 377                         goto fail;
 378                 }
 379
 380                 set_empty_xattr = true;
 381         }
 382
 383         if (how->flags & O_TRUNC) {
 384                 set_empty_xattr = true;
 385         }
 386
 387         if (set_empty_xattr) {
 388                 /*
 389                  * The attribute does not exist or needs to be truncated
 390                  */
 391
 392                 /*
 393                  * Darn, xattrs need at least 1 byte
 394                  */
 395                 char null = '\0';
 396
 397                 DEBUG(10, ("creating or truncating attribute %s on file %s\n",
 398                            xattr_name, smb_fname->base_name));
 399
 400                 ret = SMB_VFS_FSETXATTR(fsp->base_fsp,
 401                                        xattr_name,
 402                                        &null, sizeof(null),
 403                                        how->flags & O_EXCL ? XATTR_CREATE : 0);
 404                 if (ret != 0) {
 405                         goto fail;
 406                 }
 407         }
 408
 409         fakefd = vfs_fake_fd();
 410
 411         sio = VFS_ADD_FSP_EXTENSION(handle, fsp, struct stream_io, NULL);
 412         if (sio == NULL) {
 413                 errno = ENOMEM;
 414                 goto fail;
 415         }
 416
 417         sio->xattr_name = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(handle, fsp),
 418                                         xattr_name);
 419         if (sio->xattr_name == NULL) {
 420                 errno = ENOMEM;
 421                 goto fail;
 422         }
 423
 424         /*
 425          * so->base needs to be a copy of fsp->fsp_name->base_name,
 426          * making it identical to streams_xattr_recheck(). If the
 427          * open is changing directories, fsp->fsp_name->base_name
 428          * will be the full path from the share root, whilst
 429          * smb_fname will be relative to the $cwd.
 430          */
 431         sio->base = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(handle, fsp),
 432                                   fsp->fsp_name->base_name);
 433         if (sio->base == NULL) {
 434                 errno = ENOMEM;
 435                 goto fail;
 436         }
 437
 438         sio->fsp_name_ptr = fsp->fsp_name;
 439         sio->handle = handle;
 440         sio->fsp = fsp;
 441
 442         return fakefd;
 443
 444  fail:
 445         if (fakefd >= 0) {
 446                 vfs_fake_fd_close(fakefd);
 447                 fakefd = -1;
 448         }
 449
 450         return -1;
 451 }
 452
 453 static int streams_xattr_close(vfs_handle_struct *handle,
 454                                files_struct *fsp)
 455 {
 456         int ret;
 457         int fd;
 458
 459         fd = fsp_get_pathref_fd(fsp);
 460
 461         DBG_DEBUG("streams_xattr_close called [%s] fd [%d]\n",
 462                         smb_fname_str_dbg(fsp->fsp_name), fd);
 463
 464         if (!fsp_is_alternate_stream(fsp)) {
 465                 return SMB_VFS_NEXT_CLOSE(handle, fsp);
 466         }
 467
 468         ret = vfs_fake_fd_close(fd);
 469         fsp_set_fd(fsp, -1);
 470
 471         return ret;
 472 }
 473
 474 static int streams_xattr_unlinkat(vfs_handle_struct *handle,
 475                         struct files_struct *dirfsp,
 476                         const struct smb_filename *smb_fname,
 477                         int flags)
 478 {
 479         NTSTATUS status;
 480         int ret = -1;
 481         char *xattr_name = NULL;
 482         struct smb_filename *pathref = NULL;
 483         struct files_struct *fsp = smb_fname->fsp;
 484
 485         if (!is_named_stream(smb_fname)) {
 486                 return SMB_VFS_NEXT_UNLINKAT(handle,
 487                                         dirfsp,
 488                                         smb_fname,
 489                                         flags);
 490         }
 491
 492         /* A stream can never be rmdir'ed */
 493         SMB_ASSERT((flags & AT_REMOVEDIR) == 0);
 494
 495         status = streams_xattr_get_name(handle, talloc_tos(),
 496                                         smb_fname->stream_name, &xattr_name);
 497         if (!NT_STATUS_IS_OK(status)) {
 498                 errno = map_errno_from_nt_status(status);
 499                 goto fail;
 500         }
 501
 502         if (fsp == NULL) {
 503                 status = synthetic_pathref(talloc_tos(),
 504                                         handle->conn->cwd_fsp,
 505                                         smb_fname->base_name,
 506                                         NULL,
 507                                         NULL,
 508                                         smb_fname->twrp,
 509                                         smb_fname->flags,
 510                                         &pathref);
 511                 if (!NT_STATUS_IS_OK(status)) {
 512                         errno = ENOENT;
 513                         goto fail;
 514                 }
 515                 fsp = pathref->fsp;
 516         } else {
 517                 SMB_ASSERT(fsp_is_alternate_stream(smb_fname->fsp));
 518                 fsp = fsp->base_fsp;
 519         }
 520
 521         ret = SMB_VFS_FREMOVEXATTR(fsp, xattr_name);
 522
 523         if ((ret == -1) && (errno == ENOATTR)) {
 524                 errno = ENOENT;
 525                 goto fail;
 526         }
 527
 528         ret = 0;
 529
 530  fail:
 531         TALLOC_FREE(xattr_name);
 532         TALLOC_FREE(pathref);
 533         return ret;
 534 }
 535
 536 static int streams_xattr_renameat(vfs_handle_struct *handle,
 537                                 files_struct *srcfsp,
 538                                 const struct smb_filename *smb_fname_src,
 539                                 files_struct *dstfsp,
 540                                 const struct smb_filename *smb_fname_dst)
 541 {
 542         NTSTATUS status;
 543         int ret = -1;
 544         char *src_xattr_name = NULL;
 545         char *dst_xattr_name = NULL;
 546         bool src_is_stream, dst_is_stream;
 547         ssize_t oret;
 548         ssize_t nret;
 549         struct ea_struct ea;
 550         struct smb_filename *pathref_src = NULL;
 551         struct smb_filename *pathref_dst = NULL;
 552         struct smb_filename *full_src = NULL;
 553         struct smb_filename *full_dst = NULL;
 554
 555         src_is_stream = is_ntfs_stream_smb_fname(smb_fname_src);
 556         dst_is_stream = is_ntfs_stream_smb_fname(smb_fname_dst);
 557
 558         if (!src_is_stream && !dst_is_stream) {
 559                 return SMB_VFS_NEXT_RENAMEAT(handle,
 560                                         srcfsp,
 561                                         smb_fname_src,
 562                                         dstfsp,
 563                                         smb_fname_dst);
 564         }
 565
 566         /* For now don't allow renames from or to the default stream. */
 567         if (is_ntfs_default_stream_smb_fname(smb_fname_src) ||
 568             is_ntfs_default_stream_smb_fname(smb_fname_dst)) {
 569                 errno = ENOSYS;
 570                 goto done;
 571         }
 572
 573         /* Don't rename if the streams are identical. */
 574         if (strcasecmp_m(smb_fname_src->stream_name,
 575                        smb_fname_dst->stream_name) == 0) {
 576                 goto done;
 577         }
 578
 579         /* Get the xattr names. */
 580         status = streams_xattr_get_name(handle, talloc_tos(),
 581                                         smb_fname_src->stream_name,
 582                                         &src_xattr_name);
 583         if (!NT_STATUS_IS_OK(status)) {
 584                 errno = map_errno_from_nt_status(status);
 585                 goto fail;
 586         }
 587         status = streams_xattr_get_name(handle, talloc_tos(),
 588                                         smb_fname_dst->stream_name,
 589                                         &dst_xattr_name);
 590         if (!NT_STATUS_IS_OK(status)) {
 591                 errno = map_errno_from_nt_status(status);
 592                 goto fail;
 593         }
 594
 595         full_src = full_path_from_dirfsp_atname(talloc_tos(),
 596                                                 srcfsp,
 597                                                 smb_fname_src);
 598         if (full_src == NULL) {
 599                 errno = ENOMEM;
 600                 goto fail;
 601         }
 602         full_dst = full_path_from_dirfsp_atname(talloc_tos(),
 603                                                 dstfsp,
 604                                                 smb_fname_dst);
 605         if (full_dst == NULL) {
 606                 errno = ENOMEM;
 607                 goto fail;
 608         }
 609
 610         /* Get a pathref for full_src (base file, no stream name). */
 611         status = synthetic_pathref(talloc_tos(),
 612                                 handle->conn->cwd_fsp,
 613                                 full_src->base_name,
 614                                 NULL,
 615                                 NULL,
 616                                 full_src->twrp,
 617                                 full_src->flags,
 618                                 &pathref_src);
 619         if (!NT_STATUS_IS_OK(status)) {
 620                 errno = ENOENT;
 621                 goto fail;
 622         }
 623
 624         /* Read the old stream from the base file fsp. */
 625         status = get_ea_value_fsp(talloc_tos(),
 626                                   pathref_src->fsp,
 627                                   src_xattr_name,
 628                                   &ea);
 629         if (!NT_STATUS_IS_OK(status)) {
 630                 errno = map_errno_from_nt_status(status);
 631                 goto fail;
 632         }
 633
 634         /* Get a pathref for full_dst (base file, no stream name). */
 635         status = synthetic_pathref(talloc_tos(),
 636                                 handle->conn->cwd_fsp,
 637                                 full_dst->base_name,
 638                                 NULL,
 639                                 NULL,
 640                                 full_dst->twrp,
 641                                 full_dst->flags,
 642                                 &pathref_dst);
 643         if (!NT_STATUS_IS_OK(status)) {
 644                 errno = ENOENT;
 645                 goto fail;
 646         }
 647
 648         /* (Over)write the new stream on the base file fsp. */
 649         nret = SMB_VFS_FSETXATTR(
 650                         pathref_dst->fsp,
 651                         dst_xattr_name,
 652                         ea.value.data,
 653                         ea.value.length,
 654                         0);
 655         if (nret < 0) {
 656                 if (errno == ENOATTR) {
 657                         errno = ENOENT;
 658                 }
 659                 goto fail;
 660         }
 661
 662         /*
 663          * Remove the old stream from the base file fsp.
 664          */
 665         oret = SMB_VFS_FREMOVEXATTR(pathref_src->fsp,
 666                                     src_xattr_name);
 667         if (oret < 0) {
 668                 if (errno == ENOATTR) {
 669                         errno = ENOENT;
 670                 }
 671                 goto fail;
 672         }
 673
 674  done:
 675         errno = 0;
 676         ret = 0;
 677  fail:
 678         TALLOC_FREE(pathref_src);
 679         TALLOC_FREE(pathref_dst);
 680         TALLOC_FREE(full_src);
 681         TALLOC_FREE(full_dst);
 682         TALLOC_FREE(src_xattr_name);
 683         TALLOC_FREE(dst_xattr_name);
 684         return ret;
 685 }
 686
 687 static NTSTATUS walk_xattr_streams(vfs_handle_struct *handle,
 688                                 files_struct *fsp,
 689                                 const struct smb_filename *smb_fname,
 690                                 bool (*fn)(struct ea_struct *ea,
 691                                         void *private_data),
 692                                 void *private_data)
 693 {
 694         NTSTATUS status;
 695         char **names;
 696         size_t i, num_names;
 697         struct streams_xattr_config *config;
 698
 699         SMB_VFS_HANDLE_GET_DATA(handle, config, struct streams_xattr_config,
 700                                 return NT_STATUS_UNSUCCESSFUL);
 701
 702         status = get_ea_names_from_fsp(talloc_tos(),
 703                                 smb_fname->fsp,
 704                                 &names,
 705                                 &num_names);
 706         if (!NT_STATUS_IS_OK(status)) {
 707                 return status;
 708         }
 709
 710         for (i=0; i<num_names; i++) {
 711                 struct ea_struct ea;
 712
 713                 /*
 714                  * We want to check with samba_private_attr_name()
 715                  * whether the xattr name is a private one,
 716                  * unfortunately it flags xattrs that begin with the
 717                  * default streams prefix as private.
 718                  *
 719                  * By only calling samba_private_attr_name() in case
 720                  * the xattr does NOT begin with the default prefix,
 721                  * we know that if it returns 'true' it definitely one
 722                  * of our internal xattr like "user.DOSATTRIB".
 723                  */
 724                 if (strncasecmp_m(names[i], SAMBA_XATTR_DOSSTREAM_PREFIX,
 725                                   strlen(SAMBA_XATTR_DOSSTREAM_PREFIX)) != 0) {
 726                         if (samba_private_attr_name(names[i])) {
 727                                 continue;
 728                         }
 729                 }
 730
 731                 if (strncmp(names[i], config->prefix,
 732                             config->prefix_len) != 0) {
 733                         continue;
 734                 }
 735
 736                 status = get_ea_value_fsp(names,
 737                                           smb_fname->fsp,
 738                                           names[i],
 739                                           &ea);
 740                 if (!NT_STATUS_IS_OK(status)) {
 741                         DEBUG(10, ("Could not get ea %s for file %s: %s\n",
 742                                 names[i],
 743                                 smb_fname->base_name,
 744                                 nt_errstr(status)));
 745                         continue;
 746                 }
 747
 748                 ea.name = talloc_asprintf(
 749                         ea.value.data, ":%s%s",
 750                         names[i] + config->prefix_len,
 751                         config->store_stream_type ? "" : ":$DATA");
 752                 if (ea.name == NULL) {
 753                         DEBUG(0, ("talloc failed\n"));
 754                         continue;
 755                 }
 756
 757                 if (!fn(&ea, private_data)) {
 758                         TALLOC_FREE(ea.value.data);
 759                         return NT_STATUS_OK;
 760                 }
 761
 762                 TALLOC_FREE(ea.value.data);
 763         }
 764
 765         TALLOC_FREE(names);
 766         return NT_STATUS_OK;
 767 }
 768
 769 static bool add_one_stream(TALLOC_CTX *mem_ctx, unsigned int *num_streams,
 770                            struct stream_struct **streams,
 771                            const char *name, off_t size,
 772                            off_t alloc_size)
 773 {
 774         struct stream_struct *tmp;
 775
 776         tmp = talloc_realloc(mem_ctx, *streams, struct stream_struct,
 777                                    (*num_streams)+1);
 778         if (tmp == NULL) {
 779                 return false;
 780         }
 781
 782         tmp[*num_streams].name = talloc_strdup(tmp, name);
 783         if (tmp[*num_streams].name == NULL) {
 784                 return false;
 785         }
 786
 787         tmp[*num_streams].size = size;
 788         tmp[*num_streams].alloc_size = alloc_size;
 789
 790         *streams = tmp;
 791         *num_streams += 1;
 792         return true;
 793 }
 794
 795 struct streaminfo_state {
 796         TALLOC_CTX *mem_ctx;
 797         vfs_handle_struct *handle;
 798         unsigned int num_streams;
 799         struct stream_struct *streams;
 800         NTSTATUS status;
 801 };
 802
 803 static bool collect_one_stream(struct ea_struct *ea, void *private_data)
 804 {
 805         struct streaminfo_state *state =
 806                 (struct streaminfo_state *)private_data;
 807
 808         if (!add_one_stream(state->mem_ctx,
 809                             &state->num_streams, &state->streams,
 810                             ea->name, ea->value.length-1,
 811                             smb_roundup(state->handle->conn,
 812                                         ea->value.length-1))) {
 813                 state->status = NT_STATUS_NO_MEMORY;
 814                 return false;
 815         }
 816
 817         return true;
 818 }
 819
 820 static NTSTATUS streams_xattr_fstreaminfo(vfs_handle_struct *handle,
 821                                          struct files_struct *fsp,
 822                                          TALLOC_CTX *mem_ctx,
 823                                          unsigned int *pnum_streams,
 824                                          struct stream_struct **pstreams)
 825 {
 826         NTSTATUS status;
 827         struct streaminfo_state state;
 828
 829         state.streams = *pstreams;
 830         state.num_streams = *pnum_streams;
 831         state.mem_ctx = mem_ctx;
 832         state.handle = handle;
 833         state.status = NT_STATUS_OK;
 834
 835         status = walk_xattr_streams(handle,
 836                                     fsp,
 837                                     fsp->fsp_name,
 838                                     collect_one_stream,
 839                                     &state);
 840
 841         if (!NT_STATUS_IS_OK(status)) {
 842                 TALLOC_FREE(state.streams);
 843                 return status;
 844         }
 845
 846         if (!NT_STATUS_IS_OK(state.status)) {
 847                 TALLOC_FREE(state.streams);
 848                 return state.status;
 849         }
 850
 851         *pnum_streams = state.num_streams;
 852         *pstreams = state.streams;
 853
 854         return SMB_VFS_NEXT_FSTREAMINFO(handle,
 855                         fsp,
 856                         mem_ctx,
 857                         pnum_streams,
 858                         pstreams);
 859 }
 860
 861 static uint32_t streams_xattr_fs_capabilities(struct vfs_handle_struct *handle,
 862                         enum timestamp_set_resolution *p_ts_res)
 863 {
 864         return SMB_VFS_NEXT_FS_CAPABILITIES(handle, p_ts_res) | FILE_NAMED_STREAMS;
 865 }
 866
 867 static int streams_xattr_connect(vfs_handle_struct *handle,
 868                                  const char *service, const char *user)
 869 {
 870         struct streams_xattr_config *config;
 871         const char *default_prefix = SAMBA_XATTR_DOSSTREAM_PREFIX;
 872         const char *prefix;
 873         int rc;
 874
 875         rc = SMB_VFS_NEXT_CONNECT(handle, service, user);
 876         if (rc != 0) {
 877                 return rc;
 878         }
 879
 880         config = talloc_zero(handle->conn, struct streams_xattr_config);
 881         if (config == NULL) {
 882                 DEBUG(1, ("talloc_zero() failed\n"));
 883                 errno = ENOMEM;
 884                 return -1;
 885         }
 886
 887         prefix = lp_parm_const_string(SNUM(handle->conn),
 888                                       "streams_xattr", "prefix",
 889                                       default_prefix);
 890         config->prefix = talloc_strdup(config, prefix);
 891         if (config->prefix == NULL) {
 892                 DEBUG(1, ("talloc_strdup() failed\n"));
 893                 errno = ENOMEM;
 894                 return -1;
 895         }
 896         config->prefix_len = strlen(config->prefix);
 897         DEBUG(10, ("streams_xattr using stream prefix: %s\n", config->prefix));
 898
 899         config->store_stream_type = lp_parm_bool(SNUM(handle->conn),
 900                                                  "streams_xattr",
 901                                                  "store_stream_type",
 902                                                  true);
 903
 904         SMB_VFS_HANDLE_SET_DATA(handle, config,
 905                                 NULL, struct stream_xattr_config,
 906                                 return -1);
 907
 908         return 0;
 909 }
 910
 911 static ssize_t streams_xattr_pwrite(vfs_handle_struct *handle,
 912                                     files_struct *fsp, const void *data,
 913                                     size_t n, off_t offset)
 914 {
 915         struct stream_io *sio =
 916                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
 917         struct ea_struct ea;
 918         NTSTATUS status;
 919         int ret;
 920
 921         DEBUG(10, ("streams_xattr_pwrite called for %d bytes\n", (int)n));
 922
 923         if (sio == NULL) {
 924                 return SMB_VFS_NEXT_PWRITE(handle, fsp, data, n, offset);
 925         }
 926
 927         if (!streams_xattr_recheck(sio)) {
 928                 return -1;
 929         }
 930
 931         if ((offset + n) >= lp_smbd_max_xattr_size(SNUM(handle->conn))) {
 932                 /*
 933                  * Requested write is beyond what can be read based on
 934                  * samba configuration.
 935                  * ReFS returns STATUS_FILESYSTEM_LIMITATION, which causes
 936                  * entire file to be skipped by File Explorer. VFAT returns
 937                  * NT_STATUS_OBJECT_NAME_COLLISION causes user to be prompted
 938                  * to skip writing metadata, but copy data.
 939                  */
 940                 DBG_ERR("Write to xattr [%s] on file [%s] exceeds maximum "
 941                         "supported extended attribute size. "
 942                         "Depending on filesystem type and operating system "
 943                         "(OS) specifics, this value may be increased using "
 944                         "the value of the parameter: "
 945                         "smbd max xattr size = <bytes>. Consult OS and "
 946                         "filesystem manpages prior to increasing this limit.\n",
 947                         sio->xattr_name, sio->base);
 948                 errno = EOVERFLOW;
 949                 return -1;
 950         }
 951
 952         status = get_ea_value_fsp(talloc_tos(),
 953                                   fsp->base_fsp,
 954                                   sio->xattr_name,
 955                                   &ea);
 956         if (!NT_STATUS_IS_OK(status)) {
 957                 return -1;
 958         }
 959
 960         if ((offset + n) > ea.value.length-1) {
 961                 uint8_t *tmp;
 962
 963                 tmp = talloc_realloc(talloc_tos(), ea.value.data, uint8_t,
 964                                            offset + n + 1);
 965
 966                 if (tmp == NULL) {
 967                         TALLOC_FREE(ea.value.data);
 968                         errno = ENOMEM;
 969                         return -1;
 970                 }
 971                 ea.value.data = tmp;
 972                 ea.value.length = offset + n + 1;
 973                 ea.value.data[offset+n] = 0;
 974         }
 975
 976         memcpy(ea.value.data + offset, data, n);
 977
 978         ret = SMB_VFS_FSETXATTR(fsp->base_fsp,
 979                                 sio->xattr_name,
 980                                 ea.value.data,
 981                                 ea.value.length,
 982                                 0);
 983         TALLOC_FREE(ea.value.data);
 984
 985         if (ret == -1) {
 986                 return -1;
 987         }
 988
 989         return n;
 990 }
 991
 992 static ssize_t streams_xattr_pread(vfs_handle_struct *handle,
 993                                    files_struct *fsp, void *data,
 994                                    size_t n, off_t offset)
 995 {
 996         struct stream_io *sio =
 997                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
 998         struct ea_struct ea;
 999         NTSTATUS status;
1000         size_t length, overlap;
1001
1002         DEBUG(10, ("streams_xattr_pread: offset=%d, size=%d\n",
1003                    (int)offset, (int)n));
1004
1005         if (sio == NULL) {
1006                 return SMB_VFS_NEXT_PREAD(handle, fsp, data, n, offset);
1007         }
1008
1009         if (!streams_xattr_recheck(sio)) {
1010                 return -1;
1011         }
1012
1013         status = get_ea_value_fsp(talloc_tos(),
1014                                   fsp->base_fsp,
1015                                   sio->xattr_name,
1016                                   &ea);
1017         if (!NT_STATUS_IS_OK(status)) {
1018                 return -1;
1019         }
1020
1021         length = ea.value.length-1;
1022
1023         DBG_DEBUG("get_ea_value_fsp returned %d bytes\n",
1024                    (int)length);
1025
1026         /* Attempt to read past EOF. */
1027         if (length <= offset) {
1028                 return 0;
1029         }
1030
1031         overlap = (offset + n) > length ? (length - offset) : n;
1032         memcpy(data, ea.value.data + offset, overlap);
1033
1034         TALLOC_FREE(ea.value.data);
1035         return overlap;
1036 }
1037
1038 struct streams_xattr_pread_state {
1039         ssize_t nread;
1040         struct vfs_aio_state vfs_aio_state;
1041 };
1042
1043 static void streams_xattr_pread_done(struct tevent_req *subreq);
1044
1045 static struct tevent_req *streams_xattr_pread_send(
1046         struct vfs_handle_struct *handle,
1047         TALLOC_CTX *mem_ctx,
1048         struct tevent_context *ev,
1049         struct files_struct *fsp,
1050         void *data,
1051         size_t n, off_t offset)
1052 {
1053         struct tevent_req *req = NULL;
1054         struct tevent_req *subreq = NULL;
1055         struct streams_xattr_pread_state *state = NULL;
1056         struct stream_io *sio =
1057                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1058
1059         req = tevent_req_create(mem_ctx, &state,
1060                                 struct streams_xattr_pread_state);
1061         if (req == NULL) {
1062                 return NULL;
1063         }
1064
1065         if (sio == NULL) {
1066                 subreq = SMB_VFS_NEXT_PREAD_SEND(state, ev, handle, fsp,
1067                                                  data, n, offset);
1068                 if (tevent_req_nomem(req, subreq)) {
1069                         return tevent_req_post(req, ev);
1070                 }
1071                 tevent_req_set_callback(subreq, streams_xattr_pread_done, req);
1072                 return req;
1073         }
1074
1075         state->nread = SMB_VFS_PREAD(fsp, data, n, offset);
1076         if (state->nread != n) {
1077                 if (state->nread != -1) {
1078                         errno = EIO;
1079                 }
1080                 tevent_req_error(req, errno);
1081                 return tevent_req_post(req, ev);
1082         }
1083
1084         tevent_req_done(req);
1085         return tevent_req_post(req, ev);
1086 }
1087
1088 static void streams_xattr_pread_done(struct tevent_req *subreq)
1089 {
1090         struct tevent_req *req = tevent_req_callback_data(
1091                 subreq, struct tevent_req);
1092         struct streams_xattr_pread_state *state = tevent_req_data(
1093                 req, struct streams_xattr_pread_state);
1094
1095         state->nread = SMB_VFS_PREAD_RECV(subreq, &state->vfs_aio_state);
1096         TALLOC_FREE(subreq);
1097
1098         if (tevent_req_error(req, state->vfs_aio_state.error)) {
1099                 return;
1100         }
1101         tevent_req_done(req);
1102 }
1103
1104 static ssize_t streams_xattr_pread_recv(struct tevent_req *req,
1105                                         struct vfs_aio_state *vfs_aio_state)
1106 {
1107         struct streams_xattr_pread_state *state = tevent_req_data(
1108                 req, struct streams_xattr_pread_state);
1109
1110         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
1111                 return -1;
1112         }
1113
1114         *vfs_aio_state = state->vfs_aio_state;
1115         return state->nread;
1116 }
1117
1118 struct streams_xattr_pwrite_state {
1119         ssize_t nwritten;
1120         struct vfs_aio_state vfs_aio_state;
1121 };
1122
1123 static void streams_xattr_pwrite_done(struct tevent_req *subreq);
1124
1125 static struct tevent_req *streams_xattr_pwrite_send(
1126         struct vfs_handle_struct *handle,
1127         TALLOC_CTX *mem_ctx,
1128         struct tevent_context *ev,
1129         struct files_struct *fsp,
1130         const void *data,
1131         size_t n, off_t offset)
1132 {
1133         struct tevent_req *req = NULL;
1134         struct tevent_req *subreq = NULL;
1135         struct streams_xattr_pwrite_state *state = NULL;
1136         struct stream_io *sio =
1137                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1138
1139         req = tevent_req_create(mem_ctx, &state,
1140                                 struct streams_xattr_pwrite_state);
1141         if (req == NULL) {
1142                 return NULL;
1143         }
1144
1145         if (sio == NULL) {
1146                 subreq = SMB_VFS_NEXT_PWRITE_SEND(state, ev, handle, fsp,
1147                                                   data, n, offset);
1148                 if (tevent_req_nomem(req, subreq)) {
1149                         return tevent_req_post(req, ev);
1150                 }
1151                 tevent_req_set_callback(subreq, streams_xattr_pwrite_done, req);
1152                 return req;
1153         }
1154
1155         state->nwritten = SMB_VFS_PWRITE(fsp, data, n, offset);
1156         if (state->nwritten != n) {
1157                 if (state->nwritten != -1) {
1158                         errno = EIO;
1159                 }
1160                 tevent_req_error(req, errno);
1161                 return tevent_req_post(req, ev);
1162         }
1163
1164         tevent_req_done(req);
1165         return tevent_req_post(req, ev);
1166 }
1167
1168 static void streams_xattr_pwrite_done(struct tevent_req *subreq)
1169 {
1170         struct tevent_req *req = tevent_req_callback_data(
1171                 subreq, struct tevent_req);
1172         struct streams_xattr_pwrite_state *state = tevent_req_data(
1173                 req, struct streams_xattr_pwrite_state);
1174
1175         state->nwritten = SMB_VFS_PWRITE_RECV(subreq, &state->vfs_aio_state);
1176         TALLOC_FREE(subreq);
1177
1178         if (tevent_req_error(req, state->vfs_aio_state.error)) {
1179                 return;
1180         }
1181         tevent_req_done(req);
1182 }
1183
1184 static ssize_t streams_xattr_pwrite_recv(struct tevent_req *req,
1185                                          struct vfs_aio_state *vfs_aio_state)
1186 {
1187         struct streams_xattr_pwrite_state *state = tevent_req_data(
1188                 req, struct streams_xattr_pwrite_state);
1189
1190         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
1191                 return -1;
1192         }
1193
1194         *vfs_aio_state = state->vfs_aio_state;
1195         return state->nwritten;
1196 }
1197
1198 static int streams_xattr_ftruncate(struct vfs_handle_struct *handle,
1199                                         struct files_struct *fsp,
1200                                         off_t offset)
1201 {
1202         int ret;
1203         uint8_t *tmp;
1204         struct ea_struct ea;
1205         NTSTATUS status;
1206         struct stream_io *sio =
1207                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1208
1209         DEBUG(10, ("streams_xattr_ftruncate called for file %s offset %.0f\n",
1210                    fsp_str_dbg(fsp), (double)offset));
1211
1212         if (sio == NULL) {
1213                 return SMB_VFS_NEXT_FTRUNCATE(handle, fsp, offset);
1214         }
1215
1216         if (!streams_xattr_recheck(sio)) {
1217                 return -1;
1218         }
1219
1220         status = get_ea_value_fsp(talloc_tos(),
1221                                   fsp->base_fsp,
1222                                   sio->xattr_name,
1223                                   &ea);
1224         if (!NT_STATUS_IS_OK(status)) {
1225                 return -1;
1226         }
1227
1228         tmp = talloc_realloc(talloc_tos(), ea.value.data, uint8_t,
1229                                    offset + 1);
1230
1231         if (tmp == NULL) {
1232                 TALLOC_FREE(ea.value.data);
1233                 errno = ENOMEM;
1234                 return -1;
1235         }
1236
1237         /* Did we expand ? */
1238         if (ea.value.length < offset + 1) {
1239                 memset(&tmp[ea.value.length], '\0',
1240                         offset + 1 - ea.value.length);
1241         }
1242
1243         ea.value.data = tmp;
1244         ea.value.length = offset + 1;
1245         ea.value.data[offset] = 0;
1246
1247         ret = SMB_VFS_FSETXATTR(fsp->base_fsp,
1248                                 sio->xattr_name,
1249                                 ea.value.data,
1250                                 ea.value.length,
1251                                 0);
1252
1253         TALLOC_FREE(ea.value.data);
1254
1255         if (ret == -1) {
1256                 return -1;
1257         }
1258
1259         return 0;
1260 }
1261
1262 static int streams_xattr_fallocate(struct vfs_handle_struct *handle,
1263                                         struct files_struct *fsp,
1264                                         uint32_t mode,
1265                                         off_t offset,
1266                                         off_t len)
1267 {
1268         struct stream_io *sio =
1269                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1270
1271         DEBUG(10, ("streams_xattr_fallocate called for file %s offset %.0f"
1272                 "len = %.0f\n",
1273                 fsp_str_dbg(fsp), (double)offset, (double)len));
1274
1275         if (sio == NULL) {
1276                 return SMB_VFS_NEXT_FALLOCATE(handle, fsp, mode, offset, len);
1277         }
1278
1279         if (!streams_xattr_recheck(sio)) {
1280                 return -1;
1281         }
1282
1283         /* Let the pwrite code path handle it. */
1284         errno = ENOSYS;
1285         return -1;
1286 }
1287
1288 static int streams_xattr_fchown(vfs_handle_struct *handle, files_struct *fsp,
1289                                 uid_t uid, gid_t gid)
1290 {
1291         struct stream_io *sio =
1292                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1293
1294         if (sio == NULL) {
1295                 return SMB_VFS_NEXT_FCHOWN(handle, fsp, uid, gid);
1296         }
1297
1298         return 0;
1299 }
1300
1301 static int streams_xattr_fchmod(vfs_handle_struct *handle,
1302                                 files_struct *fsp,
1303                                 mode_t mode)
1304 {
1305         struct stream_io *sio =
1306                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1307
1308         if (sio == NULL) {
1309                 return SMB_VFS_NEXT_FCHMOD(handle, fsp, mode);
1310         }
1311
1312         return 0;
1313 }
1314
1315 static ssize_t streams_xattr_fgetxattr(struct vfs_handle_struct *handle,
1316                                        struct files_struct *fsp,
1317                                        const char *name,
1318                                        void *value,
1319                                        size_t size)
1320 {
1321         struct stream_io *sio =
1322                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1323
1324         if (sio == NULL) {
1325                 return SMB_VFS_NEXT_FGETXATTR(handle, fsp, name, value, size);
1326         }
1327
1328         errno = ENOTSUP;
1329         return -1;
1330 }
1331
1332 static ssize_t streams_xattr_flistxattr(struct vfs_handle_struct *handle,
1333                                         struct files_struct *fsp,
1334                                         char *list,
1335                                         size_t size)
1336 {
1337         struct stream_io *sio =
1338                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1339
1340         if (sio == NULL) {
1341                 return SMB_VFS_NEXT_FLISTXATTR(handle, fsp, list, size);
1342         }
1343
1344         errno = ENOTSUP;
1345         return -1;
1346 }
1347
1348 static int streams_xattr_fremovexattr(struct vfs_handle_struct *handle,
1349                                       struct files_struct *fsp,
1350                                       const char *name)
1351 {
1352         struct stream_io *sio =
1353                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1354
1355         if (sio == NULL) {
1356                 return SMB_VFS_NEXT_FREMOVEXATTR(handle, fsp, name);
1357         }
1358
1359         errno = ENOTSUP;
1360         return -1;
1361 }
1362
1363 static int streams_xattr_fsetxattr(struct vfs_handle_struct *handle,
1364                                    struct files_struct *fsp,
1365                                    const char *name,
1366                                    const void *value,
1367                                    size_t size,
1368                                    int flags)
1369 {
1370         struct stream_io *sio =
1371                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1372
1373         if (sio == NULL) {
1374                 return SMB_VFS_NEXT_FSETXATTR(handle, fsp, name, value,
1375                                               size, flags);
1376         }
1377
1378         errno = ENOTSUP;
1379         return -1;
1380 }
1381
1382 struct streams_xattr_fsync_state {
1383         int ret;
1384         struct vfs_aio_state vfs_aio_state;
1385 };
1386
1387 static void streams_xattr_fsync_done(struct tevent_req *subreq);
1388
1389 static struct tevent_req *streams_xattr_fsync_send(
1390         struct vfs_handle_struct *handle,
1391         TALLOC_CTX *mem_ctx,
1392         struct tevent_context *ev,
1393         struct files_struct *fsp)
1394 {
1395         struct tevent_req *req = NULL;
1396         struct tevent_req *subreq = NULL;
1397         struct streams_xattr_fsync_state *state = NULL;
1398         struct stream_io *sio =
1399                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1400
1401         req = tevent_req_create(mem_ctx, &state,
1402                                 struct streams_xattr_fsync_state);
1403         if (req == NULL) {
1404                 return NULL;
1405         }
1406
1407         if (sio == NULL) {
1408                 subreq = SMB_VFS_NEXT_FSYNC_SEND(state, ev, handle, fsp);
1409                 if (tevent_req_nomem(req, subreq)) {
1410                         return tevent_req_post(req, ev);
1411                 }
1412                 tevent_req_set_callback(subreq, streams_xattr_fsync_done, req);
1413                 return req;
1414         }
1415
1416         /*
1417          * There's no pathname based sync variant and we don't have access to
1418          * the basefile handle, so we can't do anything here.
1419          */
1420
1421         tevent_req_done(req);
1422         return tevent_req_post(req, ev);
1423 }
1424
1425 static void streams_xattr_fsync_done(struct tevent_req *subreq)
1426 {
1427         struct tevent_req *req = tevent_req_callback_data(
1428                 subreq, struct tevent_req);
1429         struct streams_xattr_fsync_state *state = tevent_req_data(
1430                 req, struct streams_xattr_fsync_state);
1431
1432         state->ret = SMB_VFS_FSYNC_RECV(subreq, &state->vfs_aio_state);
1433         TALLOC_FREE(subreq);
1434         if (state->ret != 0) {
1435                 tevent_req_error(req, errno);
1436                 return;
1437         }
1438
1439         tevent_req_done(req);
1440 }
1441
1442 static int streams_xattr_fsync_recv(struct tevent_req *req,
1443                                     struct vfs_aio_state *vfs_aio_state)
1444 {
1445         struct streams_xattr_fsync_state *state = tevent_req_data(
1446                 req, struct streams_xattr_fsync_state);
1447
1448         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
1449                 return -1;
1450         }
1451
1452         *vfs_aio_state = state->vfs_aio_state;
1453         return state->ret;
1454 }
1455
1456 static bool streams_xattr_lock(vfs_handle_struct *handle,
1457                                files_struct *fsp,
1458                                int op,
1459                                off_t offset,
1460                                off_t count,
1461                                int type)
1462 {
1463         struct stream_io *sio =
1464                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1465
1466         if (sio == NULL) {
1467                 return SMB_VFS_NEXT_LOCK(handle, fsp, op, offset, count, type);
1468         }
1469
1470         return true;
1471 }
1472
1473 static bool streams_xattr_getlock(vfs_handle_struct *handle,
1474                                   files_struct *fsp,
1475                                   off_t *poffset,
1476                                   off_t *pcount,
1477                                   int *ptype,
1478                                   pid_t *ppid)
1479 {
1480         struct stream_io *sio =
1481                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1482
1483         if (sio == NULL) {
1484                 return SMB_VFS_NEXT_GETLOCK(handle, fsp, poffset,
1485                                             pcount, ptype, ppid);
1486         }
1487
1488         errno = ENOTSUP;
1489         return false;
1490 }
1491
1492 static int streams_xattr_filesystem_sharemode(vfs_handle_struct *handle,
1493                                               files_struct *fsp,
1494                                               uint32_t share_access,
1495                                               uint32_t access_mask)
1496 {
1497         struct stream_io *sio =
1498                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1499
1500         if (sio == NULL) {
1501                 return SMB_VFS_NEXT_FILESYSTEM_SHAREMODE(handle,
1502                                                          fsp,
1503                                                          share_access,
1504                                                          access_mask);
1505         }
1506
1507         return 0;
1508 }
1509
1510 static int streams_xattr_linux_setlease(vfs_handle_struct *handle,
1511                                         files_struct *fsp,
1512                                         int leasetype)
1513 {
1514         struct stream_io *sio =
1515                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1516
1517         if (sio == NULL) {
1518                 return SMB_VFS_NEXT_LINUX_SETLEASE(handle, fsp, leasetype);
1519         }
1520
1521         return 0;
1522 }
1523
1524 static bool streams_xattr_strict_lock_check(struct vfs_handle_struct *handle,
1525                                             files_struct *fsp,
1526                                             struct lock_struct *plock)
1527 {
1528         struct stream_io *sio =
1529                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1530
1531         if (sio == NULL) {
1532                 return SMB_VFS_NEXT_STRICT_LOCK_CHECK(handle, fsp, plock);
1533         }
1534
1535         return true;
1536 }
1537
1538 static int streams_xattr_fcntl(vfs_handle_struct *handle,
1539                                files_struct *fsp,
1540                                int cmd,
1541                                va_list cmd_arg)
1542 {
1543         va_list dup_cmd_arg;
1544         void *arg;
1545         int ret;
1546
1547         if (fsp_is_alternate_stream(fsp)) {
1548                 switch (cmd) {
1549                 case F_GETFL:
1550                 case F_SETFL:
1551                         break;
1552                 default:
1553                         DBG_ERR("Unsupported fcntl() cmd [%d] on [%s]\n",
1554                                 cmd, fsp_str_dbg(fsp));
1555                         errno = EINVAL;
1556                         return -1;
1557                 }
1558         }
1559
1560         va_copy(dup_cmd_arg, cmd_arg);
1561         arg = va_arg(dup_cmd_arg, void *);
1562
1563         ret = SMB_VFS_NEXT_FCNTL(handle, fsp, cmd, arg);
1564
1565         va_end(dup_cmd_arg);
1566
1567         return ret;
1568 }
1569
1570 static struct vfs_fn_pointers vfs_streams_xattr_fns = {
1571         .fs_capabilities_fn = streams_xattr_fs_capabilities,
1572         .connect_fn = streams_xattr_connect,
1573         .openat_fn = streams_xattr_openat,
1574         .close_fn = streams_xattr_close,
1575         .stat_fn = streams_xattr_stat,
1576         .fstat_fn = streams_xattr_fstat,
1577         .lstat_fn = streams_xattr_lstat,
1578         .pread_fn = streams_xattr_pread,
1579         .pwrite_fn = streams_xattr_pwrite,
1580         .pread_send_fn = streams_xattr_pread_send,
1581         .pread_recv_fn = streams_xattr_pread_recv,
1582         .pwrite_send_fn = streams_xattr_pwrite_send,
1583         .pwrite_recv_fn = streams_xattr_pwrite_recv,
1584         .unlinkat_fn = streams_xattr_unlinkat,
1585         .renameat_fn = streams_xattr_renameat,
1586         .ftruncate_fn = streams_xattr_ftruncate,
1587         .fallocate_fn = streams_xattr_fallocate,
1588         .fstreaminfo_fn = streams_xattr_fstreaminfo,
1589
1590         .fsync_send_fn = streams_xattr_fsync_send,
1591         .fsync_recv_fn = streams_xattr_fsync_recv,
1592
1593         .lock_fn = streams_xattr_lock,
1594         .getlock_fn = streams_xattr_getlock,
1595         .filesystem_sharemode_fn = streams_xattr_filesystem_sharemode,
1596         .linux_setlease_fn = streams_xattr_linux_setlease,
1597         .strict_lock_check_fn = streams_xattr_strict_lock_check,
1598         .fcntl_fn = streams_xattr_fcntl,
1599
1600         .fchown_fn = streams_xattr_fchown,
1601         .fchmod_fn = streams_xattr_fchmod,
1602
1603         .fgetxattr_fn = streams_xattr_fgetxattr,
1604         .flistxattr_fn = streams_xattr_flistxattr,
1605         .fremovexattr_fn = streams_xattr_fremovexattr,
1606         .fsetxattr_fn = streams_xattr_fsetxattr,
1607 };
1608
1609 static_decl_vfs;
1610 NTSTATUS vfs_streams_xattr_init(TALLOC_CTX *ctx)
1611 {
1612         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "streams_xattr",
1613                                 &vfs_streams_xattr_fns);
1614 }