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