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(connection_struct *conn,
  49                               struct files_struct *fsp,
  50                               const struct smb_filename *smb_fname,
  51                               const char *xattr_name)
  52 {
  53         NTSTATUS status;
  54         struct ea_struct ea;
  55         ssize_t result;
  56
  57         if (fsp) {
  58                 status = get_ea_value(talloc_tos(),
  59                                       conn,
  60                                       fsp,
  61                                       NULL,
  62                                       xattr_name,
  63                                       &ea);
  64         } else {
  65                 status = get_ea_value(talloc_tos(),
  66                                       conn,
  67                                       NULL,
  68                                       smb_fname,
  69                                       xattr_name,
  70                                       &ea);
  71         }
  72
  73         if (!NT_STATUS_IS_OK(status)) {
  74                 return -1;
  75         }
  76
  77         result = ea.value.length-1;
  78         TALLOC_FREE(ea.value.data);
  79         return result;
  80 }
  81
  82 /**
  83  * Given a stream name, populate xattr_name with the xattr name to use for
  84  * accessing the stream.
  85  */
  86 static NTSTATUS streams_xattr_get_name(vfs_handle_struct *handle,
  87                                        TALLOC_CTX *ctx,
  88                                        const char *stream_name,
  89                                        char **xattr_name)
  90 {
  91         char *sname;
  92         char *stype;
  93         struct streams_xattr_config *config;
  94
  95         SMB_VFS_HANDLE_GET_DATA(handle, config, struct streams_xattr_config,
  96                                 return NT_STATUS_UNSUCCESSFUL);
  97
  98         sname = talloc_strdup(ctx, stream_name + 1);
  99         if (sname == NULL) {
 100                 return NT_STATUS_NO_MEMORY;
 101         }
 102
 103         /*
 104          * With vfs_fruit option "fruit:encoding = native" we're
 105          * already converting stream names that contain illegal NTFS
 106          * characters from their on-the-wire Unicode Private Range
 107          * encoding to their native ASCII representation.
 108          *
 109          * As as result the name of xattrs storing the streams (via
 110          * vfs_streams_xattr) may contain a colon, so we have to use
 111          * strrchr_m() instead of strchr_m() for matching the stream
 112          * type suffix.
 113          *
 114          * In check_path_syntax() we've already ensured the streamname
 115          * we got from the client is valid.
 116          */
 117         stype = strrchr_m(sname, ':');
 118
 119         if (stype) {
 120                 /*
 121                  * We only support one stream type: "$DATA"
 122                  */
 123                 if (strcasecmp_m(stype, ":$DATA") != 0) {
 124                         talloc_free(sname);
 125                         return NT_STATUS_INVALID_PARAMETER;
 126                 }
 127
 128                 /* Split name and type */
 129                 stype[0] = '\0';
 130         }
 131
 132         *xattr_name = talloc_asprintf(ctx, "%s%s%s",
 133                                       config->prefix,
 134                                       sname,
 135                                       config->store_stream_type ? ":$DATA" : "");
 136         if (*xattr_name == NULL) {
 137                 talloc_free(sname);
 138                 return NT_STATUS_NO_MEMORY;
 139         }
 140
 141         DEBUG(10, ("xattr_name: %s, stream_name: %s\n", *xattr_name,
 142                    stream_name));
 143
 144         talloc_free(sname);
 145         return NT_STATUS_OK;
 146 }
 147
 148 static bool streams_xattr_recheck(struct stream_io *sio)
 149 {
 150         NTSTATUS status;
 151         char *xattr_name = NULL;
 152
 153         if (sio->fsp->fsp_name == sio->fsp_name_ptr) {
 154                 return true;
 155         }
 156
 157         if (sio->fsp->fsp_name->stream_name == NULL) {
 158                 /* how can this happen */
 159                 errno = EINVAL;
 160                 return false;
 161         }
 162
 163         status = streams_xattr_get_name(sio->handle, talloc_tos(),
 164                                         sio->fsp->fsp_name->stream_name,
 165                                         &xattr_name);
 166         if (!NT_STATUS_IS_OK(status)) {
 167                 return false;
 168         }
 169
 170         TALLOC_FREE(sio->xattr_name);
 171         TALLOC_FREE(sio->base);
 172         sio->xattr_name = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(sio->handle, sio->fsp),
 173                                         xattr_name);
 174         if (sio->xattr_name == NULL) {
 175                 DBG_DEBUG("sio->xattr_name==NULL\n");
 176                 return false;
 177         }
 178         TALLOC_FREE(xattr_name);
 179
 180         sio->base = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(sio->handle, sio->fsp),
 181                                   sio->fsp->fsp_name->base_name);
 182         if (sio->base == NULL) {
 183                 DBG_DEBUG("sio->base==NULL\n");
 184                 return false;
 185         }
 186
 187         sio->fsp_name_ptr = sio->fsp->fsp_name;
 188
 189         return true;
 190 }
 191
 192 static int streams_xattr_fstat(vfs_handle_struct *handle, files_struct *fsp,
 193                                SMB_STRUCT_STAT *sbuf)
 194 {
 195         int ret = -1;
 196         struct stream_io *io = (struct stream_io *)
 197                 VFS_FETCH_FSP_EXTENSION(handle, fsp);
 198
 199         if (io == NULL || fsp->base_fsp == NULL) {
 200                 return SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
 201         }
 202
 203         DBG_DEBUG("streams_xattr_fstat called for %s\n", fsp_str_dbg(io->fsp));
 204
 205         if (!streams_xattr_recheck(io)) {
 206                 return -1;
 207         }
 208
 209         ret = SMB_VFS_NEXT_FSTAT(handle, fsp->base_fsp, sbuf);
 210         if (ret == -1) {
 211                 return -1;
 212         }
 213
 214         sbuf->st_ex_size = get_xattr_size(handle->conn,
 215                                           fsp->base_fsp,
 216                                           NULL,
 217                                           io->xattr_name);
 218         if (sbuf->st_ex_size == -1) {
 219                 SET_STAT_INVALID(*sbuf);
 220                 return -1;
 221         }
 222
 223         DEBUG(10, ("sbuf->st_ex_size = %d\n", (int)sbuf->st_ex_size));
 224
 225         sbuf->st_ex_ino = hash_inode(sbuf, io->xattr_name);
 226         sbuf->st_ex_mode &= ~S_IFMT;
 227         sbuf->st_ex_mode &= ~S_IFDIR;
 228         sbuf->st_ex_mode |= S_IFREG;
 229         sbuf->st_ex_blocks = sbuf->st_ex_size / STAT_ST_BLOCKSIZE + 1;
 230
 231         return 0;
 232 }
 233
 234 static int streams_xattr_stat(vfs_handle_struct *handle,
 235                               struct smb_filename *smb_fname)
 236 {
 237         NTSTATUS status;
 238         int result = -1;
 239         char *xattr_name = NULL;
 240         char *tmp_stream_name = NULL;
 241         struct smb_filename *smb_fname_cp = NULL;
 242         struct files_struct *fsp = smb_fname->fsp;
 243
 244         if (!is_named_stream(smb_fname)) {
 245                 return SMB_VFS_NEXT_STAT(handle, smb_fname);
 246         }
 247
 248         /* Note if lp_posix_paths() is true, we can never
 249          * get here as is_named_stream() is
 250          * always false. So we never need worry about
 251          * not following links here. */
 252
 253         /* Populate the stat struct with info from the base file. */
 254         tmp_stream_name = smb_fname->stream_name;
 255         smb_fname->stream_name = NULL;
 256         result = SMB_VFS_NEXT_STAT(handle, smb_fname);
 257         smb_fname->stream_name = tmp_stream_name;
 258
 259         if (result == -1) {
 260                 return -1;
 261         }
 262
 263         /* Derive the xattr name to lookup. */
 264         status = streams_xattr_get_name(handle, talloc_tos(),
 265                                         smb_fname->stream_name, &xattr_name);
 266         if (!NT_STATUS_IS_OK(status)) {
 267                 errno = map_errno_from_nt_status(status);
 268                 return -1;
 269         }
 270
 271         /* Augment the base file's stat information before returning. */
 272         if (fsp == NULL) {
 273                 /*
 274                  * openat_pathref_fsp() checks for the same
 275                  * filetype as the incoming stat info before allowing
 276                  * the open, so we must ensure it's correct here.
 277                  */
 278                 smb_fname->st.st_ex_mode &= ~S_IFMT;
 279                 smb_fname->st.st_ex_mode |= S_IFREG;
 280
 281                 /*
 282                  * openat_pathref_fsp() expects a talloc'ed
 283                  * smb_filename. stat can be passed a struct
 284                  * from the stack. Make a talloc'ed copy
 285                  * so openat_pathref_fsp() can add its
 286                  * destructor.
 287                  */
 288                 smb_fname_cp = cp_smb_filename(talloc_tos(),
 289                                                smb_fname);
 290                 if (smb_fname_cp == NULL) {
 291                         TALLOC_FREE(xattr_name);
 292                         errno = ENOMEM;
 293                         return -1;
 294                 }
 295                 status = openat_pathref_fsp(handle->conn->cwd_fsp,
 296                                             smb_fname_cp);
 297                 if (!NT_STATUS_IS_OK(status)) {
 298                         DBG_DEBUG("openat_pathref_fsp for %s failed with %s\n",
 299                                 smb_fname_str_dbg(smb_fname),
 300                                 nt_errstr(status));
 301                         TALLOC_FREE(xattr_name);
 302                         TALLOC_FREE(smb_fname_cp);
 303                         SET_STAT_INVALID(smb_fname->st);
 304                         errno = ENOENT;
 305                         return -1;
 306                 }
 307                 fsp = smb_fname_cp->fsp;
 308         }
 309
 310         SMB_ASSERT(fsp->base_fsp != NULL);
 311         smb_fname->st.st_ex_size = get_xattr_size(handle->conn,
 312                                           fsp->base_fsp,
 313                                           NULL,
 314                                           xattr_name);
 315         if (smb_fname->st.st_ex_size == -1) {
 316                 TALLOC_FREE(xattr_name);
 317                 TALLOC_FREE(smb_fname_cp);
 318                 SET_STAT_INVALID(smb_fname->st);
 319                 errno = ENOENT;
 320                 return -1;
 321         }
 322
 323         smb_fname->st.st_ex_ino = hash_inode(&smb_fname->st, xattr_name);
 324         smb_fname->st.st_ex_mode &= ~S_IFMT;
 325         smb_fname->st.st_ex_mode &= ~S_IFDIR;
 326         smb_fname->st.st_ex_mode |= S_IFREG;
 327         smb_fname->st.st_ex_blocks =
 328             smb_fname->st.st_ex_size / STAT_ST_BLOCKSIZE + 1;
 329
 330         TALLOC_FREE(xattr_name);
 331         TALLOC_FREE(smb_fname_cp);
 332         return 0;
 333 }
 334
 335 static int streams_xattr_lstat(vfs_handle_struct *handle,
 336                                struct smb_filename *smb_fname)
 337 {
 338         if (is_named_stream(smb_fname)) {
 339                 /*
 340                  * There can never be EA's on a symlink.
 341                  * Windows will never see a symlink, and
 342                  * in SMB_FILENAME_POSIX_PATH mode we don't
 343                  * allow EA's on a symlink.
 344                  */
 345                 SET_STAT_INVALID(smb_fname->st);
 346                 errno = ENOENT;
 347                 return -1;
 348         }
 349         return SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 350 }
 351
 352 static int streams_xattr_openat(struct vfs_handle_struct *handle,
 353                                 const struct files_struct *dirfsp,
 354                                 const struct smb_filename *smb_fname,
 355                                 files_struct *fsp,
 356                                 int flags,
 357                                 mode_t mode)
 358 {
 359         NTSTATUS status;
 360         struct streams_xattr_config *config = NULL;
 361         struct stream_io *sio = NULL;
 362         struct ea_struct ea;
 363         char *xattr_name = NULL;
 364         int fakefd = -1;
 365         bool set_empty_xattr = false;
 366         int ret;
 367
 368         SMB_VFS_HANDLE_GET_DATA(handle, config, struct streams_xattr_config,
 369                                 return -1);
 370
 371         DEBUG(10, ("streams_xattr_open called for %s with flags 0x%x\n",
 372                    smb_fname_str_dbg(smb_fname), flags));
 373
 374         if (!is_named_stream(smb_fname)) {
 375                 return SMB_VFS_NEXT_OPENAT(handle,
 376                                            dirfsp,
 377                                            smb_fname,
 378                                            fsp,
 379                                            flags,
 380                                            mode);
 381         }
 382
 383         /*
 384          * For now assert this, so the below SMB_VFS_SETXATTR() works.
 385          */
 386         SMB_ASSERT(fsp_get_pathref_fd(dirfsp) == AT_FDCWD);
 387
 388         status = streams_xattr_get_name(handle, talloc_tos(),
 389                                         smb_fname->stream_name, &xattr_name);
 390         if (!NT_STATUS_IS_OK(status)) {
 391                 errno = map_errno_from_nt_status(status);
 392                 goto fail;
 393         }
 394
 395         status = get_ea_value(talloc_tos(),
 396                               handle->conn,
 397                               fsp->base_fsp,
 398                               NULL,
 399                               xattr_name,
 400                               &ea);
 401
 402         DEBUG(10, ("get_ea_value returned %s\n", nt_errstr(status)));
 403
 404         if (!NT_STATUS_IS_OK(status)) {
 405                 if (!NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 406                         /*
 407                          * The base file is not there. This is an error even if
 408                          * we got O_CREAT, the higher levels should have created
 409                          * the base file for us.
 410                          */
 411                         DBG_DEBUG("streams_xattr_open: base file %s not around, "
 412                                   "returning ENOENT\n", smb_fname->base_name);
 413                         errno = ENOENT;
 414                         goto fail;
 415                 }
 416
 417                 if (!(flags & O_CREAT)) {
 418                         errno = ENOATTR;
 419                         goto fail;
 420                 }
 421
 422                 set_empty_xattr = true;
 423         }
 424
 425         if (flags & O_TRUNC) {
 426                 set_empty_xattr = true;
 427         }
 428
 429         if (set_empty_xattr) {
 430                 /*
 431                  * The attribute does not exist or needs to be truncated
 432                  */
 433
 434                 /*
 435                  * Darn, xattrs need at least 1 byte
 436                  */
 437                 char null = '\0';
 438
 439                 DEBUG(10, ("creating or truncating attribute %s on file %s\n",
 440                            xattr_name, smb_fname->base_name));
 441
 442                 ret = SMB_VFS_FSETXATTR(fsp->base_fsp,
 443                                        xattr_name,
 444                                        &null, sizeof(null),
 445                                        flags & O_EXCL ? XATTR_CREATE : 0);
 446                 if (ret != 0) {
 447                         goto fail;
 448                 }
 449         }
 450
 451         fakefd = vfs_fake_fd();
 452
 453         sio = VFS_ADD_FSP_EXTENSION(handle, fsp, struct stream_io, NULL);
 454         if (sio == NULL) {
 455                 errno = ENOMEM;
 456                 goto fail;
 457         }
 458
 459         sio->xattr_name = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(handle, fsp),
 460                                         xattr_name);
 461         if (sio->xattr_name == NULL) {
 462                 errno = ENOMEM;
 463                 goto fail;
 464         }
 465
 466         /*
 467          * so->base needs to be a copy of fsp->fsp_name->base_name,
 468          * making it identical to streams_xattr_recheck(). If the
 469          * open is changing directories, fsp->fsp_name->base_name
 470          * will be the full path from the share root, whilst
 471          * smb_fname will be relative to the $cwd.
 472          */
 473         sio->base = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(handle, fsp),
 474                                   fsp->fsp_name->base_name);
 475         if (sio->base == NULL) {
 476                 errno = ENOMEM;
 477                 goto fail;
 478         }
 479
 480         sio->fsp_name_ptr = fsp->fsp_name;
 481         sio->handle = handle;
 482         sio->fsp = fsp;
 483
 484         return fakefd;
 485
 486  fail:
 487         if (fakefd >= 0) {
 488                 vfs_fake_fd_close(fakefd);
 489                 fakefd = -1;
 490         }
 491
 492         return -1;
 493 }
 494
 495 static int streams_xattr_close(vfs_handle_struct *handle,
 496                                files_struct *fsp)
 497 {
 498         int ret;
 499         int fd;
 500
 501         fd = fsp_get_pathref_fd(fsp);
 502
 503         DBG_DEBUG("streams_xattr_close called [%s] fd [%d]\n",
 504                         smb_fname_str_dbg(fsp->fsp_name), fd);
 505
 506         if (!is_named_stream(fsp->fsp_name)) {
 507                 return SMB_VFS_NEXT_CLOSE(handle, fsp);
 508         }
 509
 510         ret = vfs_fake_fd_close(fd);
 511         fsp_set_fd(fsp, -1);
 512
 513         return ret;
 514 }
 515
 516 static int streams_xattr_unlink_internal(vfs_handle_struct *handle,
 517                         struct files_struct *dirfsp,
 518                         const struct smb_filename *smb_fname,
 519                         int flags)
 520 {
 521         NTSTATUS status;
 522         int ret = -1;
 523         char *xattr_name = NULL;
 524
 525         if (!is_named_stream(smb_fname)) {
 526                 return SMB_VFS_NEXT_UNLINKAT(handle,
 527                                         dirfsp,
 528                                         smb_fname,
 529                                         flags);
 530         }
 531
 532         status = streams_xattr_get_name(handle, talloc_tos(),
 533                                         smb_fname->stream_name, &xattr_name);
 534         if (!NT_STATUS_IS_OK(status)) {
 535                 errno = map_errno_from_nt_status(status);
 536                 goto fail;
 537         }
 538
 539         SMB_ASSERT(smb_fname->fsp != NULL);
 540         SMB_ASSERT(smb_fname->fsp->base_fsp != NULL);
 541
 542         ret = SMB_VFS_FREMOVEXATTR(smb_fname->fsp->base_fsp, xattr_name);
 543
 544         if ((ret == -1) && (errno == ENOATTR)) {
 545                 errno = ENOENT;
 546                 goto fail;
 547         }
 548
 549         ret = 0;
 550
 551  fail:
 552         TALLOC_FREE(xattr_name);
 553         return ret;
 554 }
 555
 556 static int streams_xattr_unlinkat(vfs_handle_struct *handle,
 557                         struct files_struct *dirfsp,
 558                         const struct smb_filename *smb_fname,
 559                         int flags)
 560 {
 561         int ret;
 562         if (flags & AT_REMOVEDIR) {
 563                 ret = SMB_VFS_NEXT_UNLINKAT(handle,
 564                                 dirfsp,
 565                                 smb_fname,
 566                                 flags);
 567         } else {
 568                 ret = streams_xattr_unlink_internal(handle,
 569                                 dirfsp,
 570                                 smb_fname,
 571                                 flags);
 572         }
 573         return ret;
 574 }
 575
 576 static int streams_xattr_renameat(vfs_handle_struct *handle,
 577                                 files_struct *srcfsp,
 578                                 const struct smb_filename *smb_fname_src,
 579                                 files_struct *dstfsp,
 580                                 const struct smb_filename *smb_fname_dst)
 581 {
 582         NTSTATUS status;
 583         int ret = -1;
 584         char *src_xattr_name = NULL;
 585         char *dst_xattr_name = NULL;
 586         bool src_is_stream, dst_is_stream;
 587         ssize_t oret;
 588         ssize_t nret;
 589         struct ea_struct ea;
 590         struct smb_filename *pathref_src = NULL;
 591         struct smb_filename *pathref_dst = NULL;
 592         struct smb_filename *full_src = NULL;
 593         struct smb_filename *full_dst = NULL;
 594
 595         src_is_stream = is_ntfs_stream_smb_fname(smb_fname_src);
 596         dst_is_stream = is_ntfs_stream_smb_fname(smb_fname_dst);
 597
 598         if (!src_is_stream && !dst_is_stream) {
 599                 return SMB_VFS_NEXT_RENAMEAT(handle,
 600                                         srcfsp,
 601                                         smb_fname_src,
 602                                         dstfsp,
 603                                         smb_fname_dst);
 604         }
 605
 606         /* For now don't allow renames from or to the default stream. */
 607         if (is_ntfs_default_stream_smb_fname(smb_fname_src) ||
 608             is_ntfs_default_stream_smb_fname(smb_fname_dst)) {
 609                 errno = ENOSYS;
 610                 goto done;
 611         }
 612
 613         /* Don't rename if the streams are identical. */
 614         if (strcasecmp_m(smb_fname_src->stream_name,
 615                        smb_fname_dst->stream_name) == 0) {
 616                 goto done;
 617         }
 618
 619         /* Get the xattr names. */
 620         status = streams_xattr_get_name(handle, talloc_tos(),
 621                                         smb_fname_src->stream_name,
 622                                         &src_xattr_name);
 623         if (!NT_STATUS_IS_OK(status)) {
 624                 errno = map_errno_from_nt_status(status);
 625                 goto fail;
 626         }
 627         status = streams_xattr_get_name(handle, talloc_tos(),
 628                                         smb_fname_dst->stream_name,
 629                                         &dst_xattr_name);
 630         if (!NT_STATUS_IS_OK(status)) {
 631                 errno = map_errno_from_nt_status(status);
 632                 goto fail;
 633         }
 634
 635         full_src = full_path_from_dirfsp_atname(talloc_tos(),
 636                                                 srcfsp,
 637                                                 smb_fname_src);
 638         if (full_src == NULL) {
 639                 errno = ENOMEM;
 640                 goto fail;
 641         }
 642         full_dst = full_path_from_dirfsp_atname(talloc_tos(),
 643                                                 dstfsp,
 644                                                 smb_fname_dst);
 645         if (full_dst == NULL) {
 646                 errno = ENOMEM;
 647                 goto fail;
 648         }
 649
 650         /* Get a pathref for full_src (base file, no stream name). */
 651         status = synthetic_pathref(talloc_tos(),
 652                                 handle->conn->cwd_fsp,
 653                                 full_src->base_name,
 654                                 NULL,
 655                                 NULL,
 656                                 full_src->twrp,
 657                                 full_src->flags,
 658                                 &pathref_src);
 659         if (!NT_STATUS_IS_OK(status)) {
 660                 errno = ENOENT;
 661                 goto fail;
 662         }
 663
 664         /* Read the old stream from the base file fsp. */
 665         status = get_ea_value(talloc_tos(),
 666                               handle->conn,
 667                               pathref_src->fsp,
 668                               NULL,
 669                               src_xattr_name,
 670                               &ea);
 671         if (!NT_STATUS_IS_OK(status)) {
 672                 errno = map_errno_from_nt_status(status);
 673                 goto fail;
 674         }
 675
 676         /* Get a pathref for full_dst (base file, no stream name). */
 677         status = synthetic_pathref(talloc_tos(),
 678                                 handle->conn->cwd_fsp,
 679                                 full_dst->base_name,
 680                                 NULL,
 681                                 NULL,
 682                                 full_dst->twrp,
 683                                 full_dst->flags,
 684                                 &pathref_dst);
 685         if (!NT_STATUS_IS_OK(status)) {
 686                 errno = ENOENT;
 687                 goto fail;
 688         }
 689
 690         /* (Over)write the new stream on the base file fsp. */
 691         nret = SMB_VFS_FSETXATTR(
 692                         pathref_dst->fsp,
 693                         dst_xattr_name,
 694                         ea.value.data,
 695                         ea.value.length,
 696                         0);
 697         if (nret < 0) {
 698                 if (errno == ENOATTR) {
 699                         errno = ENOENT;
 700                 }
 701                 goto fail;
 702         }
 703
 704         /*
 705          * Remove the old stream from the base file fsp.
 706          */
 707         oret = SMB_VFS_FREMOVEXATTR(pathref_src->fsp,
 708                                     src_xattr_name);
 709         if (oret < 0) {
 710                 if (errno == ENOATTR) {
 711                         errno = ENOENT;
 712                 }
 713                 goto fail;
 714         }
 715
 716  done:
 717         errno = 0;
 718         ret = 0;
 719  fail:
 720         TALLOC_FREE(pathref_src);
 721         TALLOC_FREE(pathref_dst);
 722         TALLOC_FREE(full_src);
 723         TALLOC_FREE(full_dst);
 724         TALLOC_FREE(src_xattr_name);
 725         TALLOC_FREE(dst_xattr_name);
 726         return ret;
 727 }
 728
 729 static NTSTATUS walk_xattr_streams(vfs_handle_struct *handle,
 730                                 files_struct *fsp,
 731                                 const struct smb_filename *smb_fname,
 732                                 bool (*fn)(struct ea_struct *ea,
 733                                         void *private_data),
 734                                 void *private_data)
 735 {
 736         NTSTATUS status;
 737         char **names;
 738         size_t i, num_names;
 739         struct streams_xattr_config *config;
 740
 741         SMB_VFS_HANDLE_GET_DATA(handle, config, struct streams_xattr_config,
 742                                 return NT_STATUS_UNSUCCESSFUL);
 743
 744         status = get_ea_names_from_file(talloc_tos(),
 745                                 smb_fname->fsp,
 746                                 &names,
 747                                 &num_names);
 748         if (!NT_STATUS_IS_OK(status)) {
 749                 return status;
 750         }
 751
 752         for (i=0; i<num_names; i++) {
 753                 struct ea_struct ea;
 754
 755                 /*
 756                  * We want to check with samba_private_attr_name()
 757                  * whether the xattr name is a private one,
 758                  * unfortunately it flags xattrs that begin with the
 759                  * default streams prefix as private.
 760                  *
 761                  * By only calling samba_private_attr_name() in case
 762                  * the xattr does NOT begin with the default prefix,
 763                  * we know that if it returns 'true' it definitely one
 764                  * of our internal xattr like "user.DOSATTRIB".
 765                  */
 766                 if (strncasecmp_m(names[i], SAMBA_XATTR_DOSSTREAM_PREFIX,
 767                                   strlen(SAMBA_XATTR_DOSSTREAM_PREFIX)) != 0) {
 768                         if (samba_private_attr_name(names[i])) {
 769                                 continue;
 770                         }
 771                 }
 772
 773                 if (strncmp(names[i], config->prefix,
 774                             config->prefix_len) != 0) {
 775                         continue;
 776                 }
 777
 778                 status = get_ea_value(names,
 779                                         handle->conn,
 780                                         smb_fname->fsp,
 781                                         NULL,
 782                                         names[i],
 783                                         &ea);
 784                 if (!NT_STATUS_IS_OK(status)) {
 785                         DEBUG(10, ("Could not get ea %s for file %s: %s\n",
 786                                 names[i],
 787                                 smb_fname->base_name,
 788                                 nt_errstr(status)));
 789                         continue;
 790                 }
 791
 792                 ea.name = talloc_asprintf(
 793                         ea.value.data, ":%s%s",
 794                         names[i] + config->prefix_len,
 795                         config->store_stream_type ? "" : ":$DATA");
 796                 if (ea.name == NULL) {
 797                         DEBUG(0, ("talloc failed\n"));
 798                         continue;
 799                 }
 800
 801                 if (!fn(&ea, private_data)) {
 802                         TALLOC_FREE(ea.value.data);
 803                         return NT_STATUS_OK;
 804                 }
 805
 806                 TALLOC_FREE(ea.value.data);
 807         }
 808
 809         TALLOC_FREE(names);
 810         return NT_STATUS_OK;
 811 }
 812
 813 static bool add_one_stream(TALLOC_CTX *mem_ctx, unsigned int *num_streams,
 814                            struct stream_struct **streams,
 815                            const char *name, off_t size,
 816                            off_t alloc_size)
 817 {
 818         struct stream_struct *tmp;
 819
 820         tmp = talloc_realloc(mem_ctx, *streams, struct stream_struct,
 821                                    (*num_streams)+1);
 822         if (tmp == NULL) {
 823                 return false;
 824         }
 825
 826         tmp[*num_streams].name = talloc_strdup(tmp, name);
 827         if (tmp[*num_streams].name == NULL) {
 828                 return false;
 829         }
 830
 831         tmp[*num_streams].size = size;
 832         tmp[*num_streams].alloc_size = alloc_size;
 833
 834         *streams = tmp;
 835         *num_streams += 1;
 836         return true;
 837 }
 838
 839 struct streaminfo_state {
 840         TALLOC_CTX *mem_ctx;
 841         vfs_handle_struct *handle;
 842         unsigned int num_streams;
 843         struct stream_struct *streams;
 844         NTSTATUS status;
 845 };
 846
 847 static bool collect_one_stream(struct ea_struct *ea, void *private_data)
 848 {
 849         struct streaminfo_state *state =
 850                 (struct streaminfo_state *)private_data;
 851
 852         if (!add_one_stream(state->mem_ctx,
 853                             &state->num_streams, &state->streams,
 854                             ea->name, ea->value.length-1,
 855                             smb_roundup(state->handle->conn,
 856                                         ea->value.length-1))) {
 857                 state->status = NT_STATUS_NO_MEMORY;
 858                 return false;
 859         }
 860
 861         return true;
 862 }
 863
 864 static NTSTATUS streams_xattr_fstreaminfo(vfs_handle_struct *handle,
 865                                          struct files_struct *fsp,
 866                                          TALLOC_CTX *mem_ctx,
 867                                          unsigned int *pnum_streams,
 868                                          struct stream_struct **pstreams)
 869 {
 870         NTSTATUS status;
 871         struct streaminfo_state state;
 872
 873         state.streams = *pstreams;
 874         state.num_streams = *pnum_streams;
 875         state.mem_ctx = mem_ctx;
 876         state.handle = handle;
 877         state.status = NT_STATUS_OK;
 878
 879         status = walk_xattr_streams(handle,
 880                                     fsp,
 881                                     fsp->fsp_name,
 882                                     collect_one_stream,
 883                                     &state);
 884
 885         if (!NT_STATUS_IS_OK(status)) {
 886                 TALLOC_FREE(state.streams);
 887                 return status;
 888         }
 889
 890         if (!NT_STATUS_IS_OK(state.status)) {
 891                 TALLOC_FREE(state.streams);
 892                 return state.status;
 893         }
 894
 895         *pnum_streams = state.num_streams;
 896         *pstreams = state.streams;
 897
 898         return SMB_VFS_NEXT_FSTREAMINFO(handle,
 899                         fsp,
 900                         mem_ctx,
 901                         pnum_streams,
 902                         pstreams);
 903 }
 904
 905 static uint32_t streams_xattr_fs_capabilities(struct vfs_handle_struct *handle,
 906                         enum timestamp_set_resolution *p_ts_res)
 907 {
 908         return SMB_VFS_NEXT_FS_CAPABILITIES(handle, p_ts_res) | FILE_NAMED_STREAMS;
 909 }
 910
 911 static int streams_xattr_connect(vfs_handle_struct *handle,
 912                                  const char *service, const char *user)
 913 {
 914         struct streams_xattr_config *config;
 915         const char *default_prefix = SAMBA_XATTR_DOSSTREAM_PREFIX;
 916         const char *prefix;
 917         int rc;
 918
 919         rc = SMB_VFS_NEXT_CONNECT(handle, service, user);
 920         if (rc != 0) {
 921                 return rc;
 922         }
 923
 924         config = talloc_zero(handle->conn, struct streams_xattr_config);
 925         if (config == NULL) {
 926                 DEBUG(1, ("talloc_zero() failed\n"));
 927                 errno = ENOMEM;
 928                 return -1;
 929         }
 930
 931         prefix = lp_parm_const_string(SNUM(handle->conn),
 932                                       "streams_xattr", "prefix",
 933                                       default_prefix);
 934         config->prefix = talloc_strdup(config, prefix);
 935         if (config->prefix == NULL) {
 936                 DEBUG(1, ("talloc_strdup() failed\n"));
 937                 errno = ENOMEM;
 938                 return -1;
 939         }
 940         config->prefix_len = strlen(config->prefix);
 941         DEBUG(10, ("streams_xattr using stream prefix: %s\n", config->prefix));
 942
 943         config->store_stream_type = lp_parm_bool(SNUM(handle->conn),
 944                                                  "streams_xattr",
 945                                                  "store_stream_type",
 946                                                  true);
 947
 948         SMB_VFS_HANDLE_SET_DATA(handle, config,
 949                                 NULL, struct stream_xattr_config,
 950                                 return -1);
 951
 952         return 0;
 953 }
 954
 955 static ssize_t streams_xattr_pwrite(vfs_handle_struct *handle,
 956                                     files_struct *fsp, const void *data,
 957                                     size_t n, off_t offset)
 958 {
 959         struct stream_io *sio =
 960                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
 961         struct ea_struct ea;
 962         NTSTATUS status;
 963         int ret;
 964
 965         DEBUG(10, ("streams_xattr_pwrite called for %d bytes\n", (int)n));
 966
 967         if (sio == NULL) {
 968                 return SMB_VFS_NEXT_PWRITE(handle, fsp, data, n, offset);
 969         }
 970
 971         if (!streams_xattr_recheck(sio)) {
 972                 return -1;
 973         }
 974
 975         if ((offset + n) >= lp_smbd_max_xattr_size(SNUM(handle->conn))) {
 976                 /*
 977                  * Requested write is beyond what can be read based on
 978                  * samba configuration.
 979                  * ReFS returns STATUS_FILESYSTEM_LIMITATION, which causes
 980                  * entire file to be skipped by File Explorer. VFAT returns
 981                  * NT_STATUS_OBJECT_NAME_COLLISION causes user to be prompted
 982                  * to skip writing metadata, but copy data.
 983                  */
 984                 DBG_ERR("Write to xattr [%s] on file [%s] exceeds maximum "
 985                         "supported extended attribute size. "
 986                         "Depending on filesystem type and operating system "
 987                         "(OS) specifics, this value may be increased using "
 988                         "the value of the parameter: "
 989                         "smbd max xattr size = <bytes>. Consult OS and "
 990                         "filesystem manpages prior to increasing this limit.\n",
 991                         sio->xattr_name, sio->base);
 992                 errno = EOVERFLOW;
 993                 return -1;
 994         }
 995
 996         status = get_ea_value(talloc_tos(),
 997                               handle->conn,
 998                               fsp->base_fsp,
 999                               NULL,
1000                               sio->xattr_name,
1001                               &ea);
1002         if (!NT_STATUS_IS_OK(status)) {
1003                 return -1;
1004         }
1005
1006         if ((offset + n) > ea.value.length-1) {
1007                 uint8_t *tmp;
1008
1009                 tmp = talloc_realloc(talloc_tos(), ea.value.data, uint8_t,
1010                                            offset + n + 1);
1011
1012                 if (tmp == NULL) {
1013                         TALLOC_FREE(ea.value.data);
1014                         errno = ENOMEM;
1015                         return -1;
1016                 }
1017                 ea.value.data = tmp;
1018                 ea.value.length = offset + n + 1;
1019                 ea.value.data[offset+n] = 0;
1020         }
1021
1022         memcpy(ea.value.data + offset, data, n);
1023
1024         ret = SMB_VFS_FSETXATTR(fsp->base_fsp,
1025                                 sio->xattr_name,
1026                                 ea.value.data,
1027                                 ea.value.length,
1028                                 0);
1029         TALLOC_FREE(ea.value.data);
1030
1031         if (ret == -1) {
1032                 return -1;
1033         }
1034
1035         return n;
1036 }
1037
1038 static ssize_t streams_xattr_pread(vfs_handle_struct *handle,
1039                                    files_struct *fsp, void *data,
1040                                    size_t n, off_t offset)
1041 {
1042         struct stream_io *sio =
1043                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1044         struct ea_struct ea;
1045         NTSTATUS status;
1046         size_t length, overlap;
1047
1048         DEBUG(10, ("streams_xattr_pread: offset=%d, size=%d\n",
1049                    (int)offset, (int)n));
1050
1051         if (sio == NULL) {
1052                 return SMB_VFS_NEXT_PREAD(handle, fsp, data, n, offset);
1053         }
1054
1055         if (!streams_xattr_recheck(sio)) {
1056                 return -1;
1057         }
1058
1059         status = get_ea_value(talloc_tos(),
1060                               handle->conn,
1061                               fsp->base_fsp,
1062                               NULL,
1063                               sio->xattr_name,
1064                               &ea);
1065         if (!NT_STATUS_IS_OK(status)) {
1066                 return -1;
1067         }
1068
1069         length = ea.value.length-1;
1070
1071         DEBUG(10, ("streams_xattr_pread: get_ea_value returned %d bytes\n",
1072                    (int)length));
1073
1074         /* Attempt to read past EOF. */
1075         if (length <= offset) {
1076                 return 0;
1077         }
1078
1079         overlap = (offset + n) > length ? (length - offset) : n;
1080         memcpy(data, ea.value.data + offset, overlap);
1081
1082         TALLOC_FREE(ea.value.data);
1083         return overlap;
1084 }
1085
1086 struct streams_xattr_pread_state {
1087         ssize_t nread;
1088         struct vfs_aio_state vfs_aio_state;
1089 };
1090
1091 static void streams_xattr_pread_done(struct tevent_req *subreq);
1092
1093 static struct tevent_req *streams_xattr_pread_send(
1094         struct vfs_handle_struct *handle,
1095         TALLOC_CTX *mem_ctx,
1096         struct tevent_context *ev,
1097         struct files_struct *fsp,
1098         void *data,
1099         size_t n, off_t offset)
1100 {
1101         struct tevent_req *req = NULL;
1102         struct tevent_req *subreq = NULL;
1103         struct streams_xattr_pread_state *state = NULL;
1104         struct stream_io *sio =
1105                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1106
1107         req = tevent_req_create(mem_ctx, &state,
1108                                 struct streams_xattr_pread_state);
1109         if (req == NULL) {
1110                 return NULL;
1111         }
1112
1113         if (sio == NULL) {
1114                 subreq = SMB_VFS_NEXT_PREAD_SEND(state, ev, handle, fsp,
1115                                                  data, n, offset);
1116                 if (tevent_req_nomem(req, subreq)) {
1117                         return tevent_req_post(req, ev);
1118                 }
1119                 tevent_req_set_callback(subreq, streams_xattr_pread_done, req);
1120                 return req;
1121         }
1122
1123         state->nread = SMB_VFS_PREAD(fsp, data, n, offset);
1124         if (state->nread != n) {
1125                 if (state->nread != -1) {
1126                         errno = EIO;
1127                 }
1128                 tevent_req_error(req, errno);
1129                 return tevent_req_post(req, ev);
1130         }
1131
1132         tevent_req_done(req);
1133         return tevent_req_post(req, ev);
1134 }
1135
1136 static void streams_xattr_pread_done(struct tevent_req *subreq)
1137 {
1138         struct tevent_req *req = tevent_req_callback_data(
1139                 subreq, struct tevent_req);
1140         struct streams_xattr_pread_state *state = tevent_req_data(
1141                 req, struct streams_xattr_pread_state);
1142
1143         state->nread = SMB_VFS_PREAD_RECV(subreq, &state->vfs_aio_state);
1144         TALLOC_FREE(subreq);
1145
1146         if (tevent_req_error(req, state->vfs_aio_state.error)) {
1147                 return;
1148         }
1149         tevent_req_done(req);
1150 }
1151
1152 static ssize_t streams_xattr_pread_recv(struct tevent_req *req,
1153                                         struct vfs_aio_state *vfs_aio_state)
1154 {
1155         struct streams_xattr_pread_state *state = tevent_req_data(
1156                 req, struct streams_xattr_pread_state);
1157
1158         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
1159                 return -1;
1160         }
1161
1162         *vfs_aio_state = state->vfs_aio_state;
1163         return state->nread;
1164 }
1165
1166 struct streams_xattr_pwrite_state {
1167         ssize_t nwritten;
1168         struct vfs_aio_state vfs_aio_state;
1169 };
1170
1171 static void streams_xattr_pwrite_done(struct tevent_req *subreq);
1172
1173 static struct tevent_req *streams_xattr_pwrite_send(
1174         struct vfs_handle_struct *handle,
1175         TALLOC_CTX *mem_ctx,
1176         struct tevent_context *ev,
1177         struct files_struct *fsp,
1178         const void *data,
1179         size_t n, off_t offset)
1180 {
1181         struct tevent_req *req = NULL;
1182         struct tevent_req *subreq = NULL;
1183         struct streams_xattr_pwrite_state *state = NULL;
1184         struct stream_io *sio =
1185                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1186
1187         req = tevent_req_create(mem_ctx, &state,
1188                                 struct streams_xattr_pwrite_state);
1189         if (req == NULL) {
1190                 return NULL;
1191         }
1192
1193         if (sio == NULL) {
1194                 subreq = SMB_VFS_NEXT_PWRITE_SEND(state, ev, handle, fsp,
1195                                                   data, n, offset);
1196                 if (tevent_req_nomem(req, subreq)) {
1197                         return tevent_req_post(req, ev);
1198                 }
1199                 tevent_req_set_callback(subreq, streams_xattr_pwrite_done, req);
1200                 return req;
1201         }
1202
1203         state->nwritten = SMB_VFS_PWRITE(fsp, data, n, offset);
1204         if (state->nwritten != n) {
1205                 if (state->nwritten != -1) {
1206                         errno = EIO;
1207                 }
1208                 tevent_req_error(req, errno);
1209                 return tevent_req_post(req, ev);
1210         }
1211
1212         tevent_req_done(req);
1213         return tevent_req_post(req, ev);
1214 }
1215
1216 static void streams_xattr_pwrite_done(struct tevent_req *subreq)
1217 {
1218         struct tevent_req *req = tevent_req_callback_data(
1219                 subreq, struct tevent_req);
1220         struct streams_xattr_pwrite_state *state = tevent_req_data(
1221                 req, struct streams_xattr_pwrite_state);
1222
1223         state->nwritten = SMB_VFS_PWRITE_RECV(subreq, &state->vfs_aio_state);
1224         TALLOC_FREE(subreq);
1225
1226         if (tevent_req_error(req, state->vfs_aio_state.error)) {
1227                 return;
1228         }
1229         tevent_req_done(req);
1230 }
1231
1232 static ssize_t streams_xattr_pwrite_recv(struct tevent_req *req,
1233                                          struct vfs_aio_state *vfs_aio_state)
1234 {
1235         struct streams_xattr_pwrite_state *state = tevent_req_data(
1236                 req, struct streams_xattr_pwrite_state);
1237
1238         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
1239                 return -1;
1240         }
1241
1242         *vfs_aio_state = state->vfs_aio_state;
1243         return state->nwritten;
1244 }
1245
1246 static int streams_xattr_ftruncate(struct vfs_handle_struct *handle,
1247                                         struct files_struct *fsp,
1248                                         off_t offset)
1249 {
1250         int ret;
1251         uint8_t *tmp;
1252         struct ea_struct ea;
1253         NTSTATUS status;
1254         struct stream_io *sio =
1255                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1256
1257         DEBUG(10, ("streams_xattr_ftruncate called for file %s offset %.0f\n",
1258                    fsp_str_dbg(fsp), (double)offset));
1259
1260         if (sio == NULL) {
1261                 return SMB_VFS_NEXT_FTRUNCATE(handle, fsp, offset);
1262         }
1263
1264         if (!streams_xattr_recheck(sio)) {
1265                 return -1;
1266         }
1267
1268         status = get_ea_value(talloc_tos(),
1269                               handle->conn,
1270                               fsp->base_fsp,
1271                               NULL,
1272                               sio->xattr_name,
1273                               &ea);
1274         if (!NT_STATUS_IS_OK(status)) {
1275                 return -1;
1276         }
1277
1278         tmp = talloc_realloc(talloc_tos(), ea.value.data, uint8_t,
1279                                    offset + 1);
1280
1281         if (tmp == NULL) {
1282                 TALLOC_FREE(ea.value.data);
1283                 errno = ENOMEM;
1284                 return -1;
1285         }
1286
1287         /* Did we expand ? */
1288         if (ea.value.length < offset + 1) {
1289                 memset(&tmp[ea.value.length], '\0',
1290                         offset + 1 - ea.value.length);
1291         }
1292
1293         ea.value.data = tmp;
1294         ea.value.length = offset + 1;
1295         ea.value.data[offset] = 0;
1296
1297         ret = SMB_VFS_FSETXATTR(fsp->base_fsp,
1298                                 sio->xattr_name,
1299                                 ea.value.data,
1300                                 ea.value.length,
1301                                 0);
1302
1303         TALLOC_FREE(ea.value.data);
1304
1305         if (ret == -1) {
1306                 return -1;
1307         }
1308
1309         return 0;
1310 }
1311
1312 static int streams_xattr_fallocate(struct vfs_handle_struct *handle,
1313                                         struct files_struct *fsp,
1314                                         uint32_t mode,
1315                                         off_t offset,
1316                                         off_t len)
1317 {
1318         struct stream_io *sio =
1319                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1320
1321         DEBUG(10, ("streams_xattr_fallocate called for file %s offset %.0f"
1322                 "len = %.0f\n",
1323                 fsp_str_dbg(fsp), (double)offset, (double)len));
1324
1325         if (sio == NULL) {
1326                 return SMB_VFS_NEXT_FALLOCATE(handle, fsp, mode, offset, len);
1327         }
1328
1329         if (!streams_xattr_recheck(sio)) {
1330                 return -1;
1331         }
1332
1333         /* Let the pwrite code path handle it. */
1334         errno = ENOSYS;
1335         return -1;
1336 }
1337
1338 static int streams_xattr_fchown(vfs_handle_struct *handle, files_struct *fsp,
1339                                 uid_t uid, gid_t gid)
1340 {
1341         struct stream_io *sio =
1342                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1343
1344         if (sio == NULL) {
1345                 return SMB_VFS_NEXT_FCHOWN(handle, fsp, uid, gid);
1346         }
1347
1348         return 0;
1349 }
1350
1351 static int streams_xattr_fchmod(vfs_handle_struct *handle,
1352                                 files_struct *fsp,
1353                                 mode_t mode)
1354 {
1355         struct stream_io *sio =
1356                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1357
1358         if (sio == NULL) {
1359                 return SMB_VFS_NEXT_FCHMOD(handle, fsp, mode);
1360         }
1361
1362         return 0;
1363 }
1364
1365 static ssize_t streams_xattr_fgetxattr(struct vfs_handle_struct *handle,
1366                                        struct files_struct *fsp,
1367                                        const char *name,
1368                                        void *value,
1369                                        size_t size)
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_FGETXATTR(handle, fsp, name, value, size);
1376         }
1377
1378         errno = ENOTSUP;
1379         return -1;
1380 }
1381
1382 static ssize_t streams_xattr_flistxattr(struct vfs_handle_struct *handle,
1383                                         struct files_struct *fsp,
1384                                         char *list,
1385                                         size_t size)
1386 {
1387         struct stream_io *sio =
1388                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1389
1390         if (sio == NULL) {
1391                 return SMB_VFS_NEXT_FLISTXATTR(handle, fsp, list, size);
1392         }
1393
1394         errno = ENOTSUP;
1395         return -1;
1396 }
1397
1398 static int streams_xattr_fremovexattr(struct vfs_handle_struct *handle,
1399                                       struct files_struct *fsp,
1400                                       const char *name)
1401 {
1402         struct stream_io *sio =
1403                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1404
1405         if (sio == NULL) {
1406                 return SMB_VFS_NEXT_FREMOVEXATTR(handle, fsp, name);
1407         }
1408
1409         errno = ENOTSUP;
1410         return -1;
1411 }
1412
1413 static int streams_xattr_fsetxattr(struct vfs_handle_struct *handle,
1414                                    struct files_struct *fsp,
1415                                    const char *name,
1416                                    const void *value,
1417                                    size_t size,
1418                                    int flags)
1419 {
1420         struct stream_io *sio =
1421                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1422
1423         if (sio == NULL) {
1424                 return SMB_VFS_NEXT_FSETXATTR(handle, fsp, name, value,
1425                                               size, flags);
1426         }
1427
1428         errno = ENOTSUP;
1429         return -1;
1430 }
1431
1432 struct streams_xattr_fsync_state {
1433         int ret;
1434         struct vfs_aio_state vfs_aio_state;
1435 };
1436
1437 static void streams_xattr_fsync_done(struct tevent_req *subreq);
1438
1439 static struct tevent_req *streams_xattr_fsync_send(
1440         struct vfs_handle_struct *handle,
1441         TALLOC_CTX *mem_ctx,
1442         struct tevent_context *ev,
1443         struct files_struct *fsp)
1444 {
1445         struct tevent_req *req = NULL;
1446         struct tevent_req *subreq = NULL;
1447         struct streams_xattr_fsync_state *state = NULL;
1448         struct stream_io *sio =
1449                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1450
1451         req = tevent_req_create(mem_ctx, &state,
1452                                 struct streams_xattr_fsync_state);
1453         if (req == NULL) {
1454                 return NULL;
1455         }
1456
1457         if (sio == NULL) {
1458                 subreq = SMB_VFS_NEXT_FSYNC_SEND(state, ev, handle, fsp);
1459                 if (tevent_req_nomem(req, subreq)) {
1460                         return tevent_req_post(req, ev);
1461                 }
1462                 tevent_req_set_callback(subreq, streams_xattr_fsync_done, req);
1463                 return req;
1464         }
1465
1466         /*
1467          * There's no pathname based sync variant and we don't have access to
1468          * the basefile handle, so we can't do anything here.
1469          */
1470
1471         tevent_req_done(req);
1472         return tevent_req_post(req, ev);
1473 }
1474
1475 static void streams_xattr_fsync_done(struct tevent_req *subreq)
1476 {
1477         struct tevent_req *req = tevent_req_callback_data(
1478                 subreq, struct tevent_req);
1479         struct streams_xattr_fsync_state *state = tevent_req_data(
1480                 req, struct streams_xattr_fsync_state);
1481
1482         state->ret = SMB_VFS_FSYNC_RECV(subreq, &state->vfs_aio_state);
1483         TALLOC_FREE(subreq);
1484         if (state->ret != 0) {
1485                 tevent_req_error(req, errno);
1486                 return;
1487         }
1488
1489         tevent_req_done(req);
1490 }
1491
1492 static int streams_xattr_fsync_recv(struct tevent_req *req,
1493                                     struct vfs_aio_state *vfs_aio_state)
1494 {
1495         struct streams_xattr_fsync_state *state = tevent_req_data(
1496                 req, struct streams_xattr_fsync_state);
1497
1498         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
1499                 return -1;
1500         }
1501
1502         *vfs_aio_state = state->vfs_aio_state;
1503         return state->ret;
1504 }
1505
1506 static bool streams_xattr_lock(vfs_handle_struct *handle,
1507                                files_struct *fsp,
1508                                int op,
1509                                off_t offset,
1510                                off_t count,
1511                                int type)
1512 {
1513         struct stream_io *sio =
1514                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1515
1516         if (sio == NULL) {
1517                 return SMB_VFS_NEXT_LOCK(handle, fsp, op, offset, count, type);
1518         }
1519
1520         return true;
1521 }
1522
1523 static bool streams_xattr_getlock(vfs_handle_struct *handle,
1524                                   files_struct *fsp,
1525                                   off_t *poffset,
1526                                   off_t *pcount,
1527                                   int *ptype,
1528                                   pid_t *ppid)
1529 {
1530         struct stream_io *sio =
1531                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1532
1533         if (sio == NULL) {
1534                 return SMB_VFS_NEXT_GETLOCK(handle, fsp, poffset,
1535                                             pcount, ptype, ppid);
1536         }
1537
1538         errno = ENOTSUP;
1539         return false;
1540 }
1541
1542 static int streams_xattr_kernel_flock(vfs_handle_struct *handle,
1543                                       files_struct *fsp,
1544                                       uint32_t share_access,
1545                                       uint32_t access_mask)
1546 {
1547         struct stream_io *sio =
1548                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1549
1550         if (sio == NULL) {
1551                 return SMB_VFS_NEXT_KERNEL_FLOCK(handle, fsp,
1552                                                  share_access, access_mask);
1553         }
1554
1555         return 0;
1556 }
1557
1558 static int streams_xattr_linux_setlease(vfs_handle_struct *handle,
1559                                         files_struct *fsp,
1560                                         int leasetype)
1561 {
1562         struct stream_io *sio =
1563                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1564
1565         if (sio == NULL) {
1566                 return SMB_VFS_NEXT_LINUX_SETLEASE(handle, fsp, leasetype);
1567         }
1568
1569         return 0;
1570 }
1571
1572 static bool streams_xattr_strict_lock_check(struct vfs_handle_struct *handle,
1573                                             files_struct *fsp,
1574                                             struct lock_struct *plock)
1575 {
1576         struct stream_io *sio =
1577                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1578
1579         if (sio == NULL) {
1580                 return SMB_VFS_NEXT_STRICT_LOCK_CHECK(handle, fsp, plock);
1581         }
1582
1583         return true;
1584 }
1585
1586 static struct vfs_fn_pointers vfs_streams_xattr_fns = {
1587         .fs_capabilities_fn = streams_xattr_fs_capabilities,
1588         .connect_fn = streams_xattr_connect,
1589         .openat_fn = streams_xattr_openat,
1590         .close_fn = streams_xattr_close,
1591         .stat_fn = streams_xattr_stat,
1592         .fstat_fn = streams_xattr_fstat,
1593         .lstat_fn = streams_xattr_lstat,
1594         .pread_fn = streams_xattr_pread,
1595         .pwrite_fn = streams_xattr_pwrite,
1596         .pread_send_fn = streams_xattr_pread_send,
1597         .pread_recv_fn = streams_xattr_pread_recv,
1598         .pwrite_send_fn = streams_xattr_pwrite_send,
1599         .pwrite_recv_fn = streams_xattr_pwrite_recv,
1600         .unlinkat_fn = streams_xattr_unlinkat,
1601         .renameat_fn = streams_xattr_renameat,
1602         .ftruncate_fn = streams_xattr_ftruncate,
1603         .fallocate_fn = streams_xattr_fallocate,
1604         .fstreaminfo_fn = streams_xattr_fstreaminfo,
1605
1606         .fsync_send_fn = streams_xattr_fsync_send,
1607         .fsync_recv_fn = streams_xattr_fsync_recv,
1608
1609         .lock_fn = streams_xattr_lock,
1610         .getlock_fn = streams_xattr_getlock,
1611         .kernel_flock_fn = streams_xattr_kernel_flock,
1612         .linux_setlease_fn = streams_xattr_linux_setlease,
1613         .strict_lock_check_fn = streams_xattr_strict_lock_check,
1614
1615         .fchown_fn = streams_xattr_fchown,
1616         .fchmod_fn = streams_xattr_fchmod,
1617
1618         .fgetxattr_fn = streams_xattr_fgetxattr,
1619         .flistxattr_fn = streams_xattr_flistxattr,
1620         .fremovexattr_fn = streams_xattr_fremovexattr,
1621         .fsetxattr_fn = streams_xattr_fsetxattr,
1622 };
1623
1624 static_decl_vfs;
1625 NTSTATUS vfs_streams_xattr_init(TALLOC_CTX *ctx)
1626 {
1627         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "streams_xattr",
1628                                 &vfs_streams_xattr_fns);
1629 }