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/crypto/md5.h"
  28 #include "lib/util/tevent_unix.h"
  29 #include "librpc/gen_ndr/ioctl.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 SMB_INO_T stream_inode(const SMB_STRUCT_STAT *sbuf, const char *sname)
  49 {
  50         MD5_CTX ctx;
  51         unsigned char hash[16];
  52         SMB_INO_T result;
  53         char *upper_sname;
  54
  55         DEBUG(10, ("stream_inode called for %lu/%lu [%s]\n",
  56                    (unsigned long)sbuf->st_ex_dev,
  57                    (unsigned long)sbuf->st_ex_ino, sname));
  58
  59         upper_sname = talloc_strdup_upper(talloc_tos(), sname);
  60         SMB_ASSERT(upper_sname != NULL);
  61
  62         MD5Init(&ctx);
  63         MD5Update(&ctx, (const unsigned char *)&(sbuf->st_ex_dev),
  64                   sizeof(sbuf->st_ex_dev));
  65         MD5Update(&ctx, (const unsigned char *)&(sbuf->st_ex_ino),
  66                   sizeof(sbuf->st_ex_ino));
  67         MD5Update(&ctx, (unsigned char *)upper_sname,
  68                   talloc_get_size(upper_sname)-1);
  69         MD5Final(hash, &ctx);
  70
  71         TALLOC_FREE(upper_sname);
  72
  73         /* Hopefully all the variation is in the lower 4 (or 8) bytes! */
  74         memcpy(&result, hash, sizeof(result));
  75
  76         DEBUG(10, ("stream_inode returns %lu\n", (unsigned long)result));
  77
  78         return result;
  79 }
  80
  81 static ssize_t get_xattr_size(connection_struct *conn,
  82                                 const struct smb_filename *smb_fname,
  83                                 const char *xattr_name)
  84 {
  85         NTSTATUS status;
  86         struct ea_struct ea;
  87         ssize_t result;
  88
  89         status = get_ea_value(talloc_tos(), conn, NULL, smb_fname,
  90                               xattr_name, &ea);
  91
  92         if (!NT_STATUS_IS_OK(status)) {
  93                 return -1;
  94         }
  95
  96         result = ea.value.length-1;
  97         TALLOC_FREE(ea.value.data);
  98         return result;
  99 }
 100
 101 /**
 102  * Given a stream name, populate xattr_name with the xattr name to use for
 103  * accessing the stream.
 104  */
 105 static NTSTATUS streams_xattr_get_name(vfs_handle_struct *handle,
 106                                        TALLOC_CTX *ctx,
 107                                        const char *stream_name,
 108                                        char **xattr_name)
 109 {
 110         char *sname;
 111         char *stype;
 112         struct streams_xattr_config *config;
 113
 114         SMB_VFS_HANDLE_GET_DATA(handle, config, struct streams_xattr_config,
 115                                 return NT_STATUS_UNSUCCESSFUL);
 116
 117         sname = talloc_strdup(ctx, stream_name + 1);
 118         if (sname == NULL) {
 119                 return NT_STATUS_NO_MEMORY;
 120         }
 121
 122         /*
 123          * With vfs_fruit option "fruit:encoding = native" we're
 124          * already converting stream names that contain illegal NTFS
 125          * characters from their on-the-wire Unicode Private Range
 126          * encoding to their native ASCII representation.
 127          *
 128          * As as result the name of xattrs storing the streams (via
 129          * vfs_streams_xattr) may contain a colon, so we have to use
 130          * strrchr_m() instead of strchr_m() for matching the stream
 131          * type suffix.
 132          *
 133          * In check_path_syntax() we've already ensured the streamname
 134          * we got from the client is valid.
 135          */
 136         stype = strrchr_m(sname, ':');
 137
 138         if (stype) {
 139                 /*
 140                  * We only support one stream type: "$DATA"
 141                  */
 142                 if (strcasecmp_m(stype, ":$DATA") != 0) {
 143                         talloc_free(sname);
 144                         return NT_STATUS_INVALID_PARAMETER;
 145                 }
 146
 147                 /* Split name and type */
 148                 stype[0] = '\0';
 149         }
 150
 151         *xattr_name = talloc_asprintf(ctx, "%s%s%s",
 152                                       config->prefix,
 153                                       sname,
 154                                       config->store_stream_type ? ":$DATA" : "");
 155         if (*xattr_name == NULL) {
 156                 talloc_free(sname);
 157                 return NT_STATUS_NO_MEMORY;
 158         }
 159
 160         DEBUG(10, ("xattr_name: %s, stream_name: %s\n", *xattr_name,
 161                    stream_name));
 162
 163         talloc_free(sname);
 164         return NT_STATUS_OK;
 165 }
 166
 167 static bool streams_xattr_recheck(struct stream_io *sio)
 168 {
 169         NTSTATUS status;
 170         char *xattr_name = NULL;
 171
 172         if (sio->fsp->fsp_name == sio->fsp_name_ptr) {
 173                 return true;
 174         }
 175
 176         if (sio->fsp->fsp_name->stream_name == NULL) {
 177                 /* how can this happen */
 178                 errno = EINVAL;
 179                 return false;
 180         }
 181
 182         status = streams_xattr_get_name(sio->handle, talloc_tos(),
 183                                         sio->fsp->fsp_name->stream_name,
 184                                         &xattr_name);
 185         if (!NT_STATUS_IS_OK(status)) {
 186                 return false;
 187         }
 188
 189         TALLOC_FREE(sio->xattr_name);
 190         TALLOC_FREE(sio->base);
 191         sio->xattr_name = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(sio->handle, sio->fsp),
 192                                         xattr_name);
 193         sio->base = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(sio->handle, sio->fsp),
 194                                   sio->fsp->fsp_name->base_name);
 195         sio->fsp_name_ptr = sio->fsp->fsp_name;
 196
 197         TALLOC_FREE(xattr_name);
 198
 199         if ((sio->xattr_name == NULL) || (sio->base == NULL)) {
 200                 return false;
 201         }
 202
 203         return true;
 204 }
 205
 206 /**
 207  * Helper to stat/lstat the base file of an smb_fname.
 208  */
 209 static int streams_xattr_stat_base(vfs_handle_struct *handle,
 210                                    struct smb_filename *smb_fname,
 211                                    bool follow_links)
 212 {
 213         char *tmp_stream_name;
 214         int result;
 215
 216         tmp_stream_name = smb_fname->stream_name;
 217         smb_fname->stream_name = NULL;
 218         if (follow_links) {
 219                 result = SMB_VFS_NEXT_STAT(handle, smb_fname);
 220         } else {
 221                 result = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 222         }
 223         smb_fname->stream_name = tmp_stream_name;
 224         return result;
 225 }
 226
 227 static int streams_xattr_fstat(vfs_handle_struct *handle, files_struct *fsp,
 228                                SMB_STRUCT_STAT *sbuf)
 229 {
 230         struct smb_filename *smb_fname_base = NULL;
 231         int ret = -1;
 232         struct stream_io *io = (struct stream_io *)
 233                 VFS_FETCH_FSP_EXTENSION(handle, fsp);
 234
 235         if (io == NULL || fsp->base_fsp == NULL) {
 236                 return SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
 237         }
 238
 239         DBG_DEBUG("streams_xattr_fstat called for %s\n", fsp_str_dbg(io->fsp));
 240
 241         if (!streams_xattr_recheck(io)) {
 242                 return -1;
 243         }
 244
 245         /* Create an smb_filename with stream_name == NULL. */
 246         smb_fname_base = synthetic_smb_fname(talloc_tos(),
 247                                         io->base,
 248                                         NULL,
 249                                         NULL,
 250                                         fsp->fsp_name->flags);
 251         if (smb_fname_base == NULL) {
 252                 errno = ENOMEM;
 253                 return -1;
 254         }
 255
 256         if (smb_fname_base->flags & SMB_FILENAME_POSIX_PATH) {
 257                 ret = SMB_VFS_LSTAT(handle->conn, smb_fname_base);
 258         } else {
 259                 ret = SMB_VFS_STAT(handle->conn, smb_fname_base);
 260         }
 261         *sbuf = smb_fname_base->st;
 262
 263         if (ret == -1) {
 264                 TALLOC_FREE(smb_fname_base);
 265                 return -1;
 266         }
 267
 268         sbuf->st_ex_size = get_xattr_size(handle->conn,
 269                                         smb_fname_base, io->xattr_name);
 270         if (sbuf->st_ex_size == -1) {
 271                 TALLOC_FREE(smb_fname_base);
 272                 SET_STAT_INVALID(*sbuf);
 273                 return -1;
 274         }
 275
 276         DEBUG(10, ("sbuf->st_ex_size = %d\n", (int)sbuf->st_ex_size));
 277
 278         sbuf->st_ex_ino = stream_inode(sbuf, io->xattr_name);
 279         sbuf->st_ex_mode &= ~S_IFMT;
 280         sbuf->st_ex_mode &= ~S_IFDIR;
 281         sbuf->st_ex_mode |= S_IFREG;
 282         sbuf->st_ex_blocks = sbuf->st_ex_size / STAT_ST_BLOCKSIZE + 1;
 283
 284         TALLOC_FREE(smb_fname_base);
 285         return 0;
 286 }
 287
 288 static int streams_xattr_stat(vfs_handle_struct *handle,
 289                               struct smb_filename *smb_fname)
 290 {
 291         NTSTATUS status;
 292         int result = -1;
 293         char *xattr_name = NULL;
 294
 295         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 296                 return SMB_VFS_NEXT_STAT(handle, smb_fname);
 297         }
 298
 299         /* Note if lp_posix_paths() is true, we can never
 300          * get here as is_ntfs_stream_smb_fname() is
 301          * always false. So we never need worry about
 302          * not following links here. */
 303
 304         /* If the default stream is requested, just stat the base file. */
 305         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 306                 return streams_xattr_stat_base(handle, smb_fname, true);
 307         }
 308
 309         /* Populate the stat struct with info from the base file. */
 310         if (streams_xattr_stat_base(handle, smb_fname, true) == -1) {
 311                 return -1;
 312         }
 313
 314         /* Derive the xattr name to lookup. */
 315         status = streams_xattr_get_name(handle, talloc_tos(),
 316                                         smb_fname->stream_name, &xattr_name);
 317         if (!NT_STATUS_IS_OK(status)) {
 318                 errno = map_errno_from_nt_status(status);
 319                 return -1;
 320         }
 321
 322         /* Augment the base file's stat information before returning. */
 323         smb_fname->st.st_ex_size = get_xattr_size(handle->conn,
 324                                                   smb_fname,
 325                                                   xattr_name);
 326         if (smb_fname->st.st_ex_size == -1) {
 327                 SET_STAT_INVALID(smb_fname->st);
 328                 errno = ENOENT;
 329                 result = -1;
 330                 goto fail;
 331         }
 332
 333         smb_fname->st.st_ex_ino = stream_inode(&smb_fname->st, xattr_name);
 334         smb_fname->st.st_ex_mode &= ~S_IFMT;
 335         smb_fname->st.st_ex_mode &= ~S_IFDIR;
 336         smb_fname->st.st_ex_mode |= S_IFREG;
 337         smb_fname->st.st_ex_blocks =
 338             smb_fname->st.st_ex_size / STAT_ST_BLOCKSIZE + 1;
 339
 340         result = 0;
 341  fail:
 342         TALLOC_FREE(xattr_name);
 343         return result;
 344 }
 345
 346 static int streams_xattr_lstat(vfs_handle_struct *handle,
 347                                struct smb_filename *smb_fname)
 348 {
 349         NTSTATUS status;
 350         int result = -1;
 351         char *xattr_name = NULL;
 352
 353         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 354                 return SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 355         }
 356
 357         /* If the default stream is requested, just stat the base file. */
 358         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 359                 return streams_xattr_stat_base(handle, smb_fname, false);
 360         }
 361
 362         /* Populate the stat struct with info from the base file. */
 363         if (streams_xattr_stat_base(handle, smb_fname, false) == -1) {
 364                 return -1;
 365         }
 366
 367         /* Derive the xattr name to lookup. */
 368         status = streams_xattr_get_name(handle, talloc_tos(),
 369                                         smb_fname->stream_name, &xattr_name);
 370         if (!NT_STATUS_IS_OK(status)) {
 371                 errno = map_errno_from_nt_status(status);
 372                 return -1;
 373         }
 374
 375         /* Augment the base file's stat information before returning. */
 376         smb_fname->st.st_ex_size = get_xattr_size(handle->conn,
 377                                                   smb_fname,
 378                                                   xattr_name);
 379         if (smb_fname->st.st_ex_size == -1) {
 380                 SET_STAT_INVALID(smb_fname->st);
 381                 errno = ENOENT;
 382                 result = -1;
 383                 goto fail;
 384         }
 385
 386         smb_fname->st.st_ex_ino = stream_inode(&smb_fname->st, xattr_name);
 387         smb_fname->st.st_ex_mode &= ~S_IFMT;
 388         smb_fname->st.st_ex_mode |= S_IFREG;
 389         smb_fname->st.st_ex_blocks =
 390             smb_fname->st.st_ex_size / STAT_ST_BLOCKSIZE + 1;
 391
 392         result = 0;
 393
 394  fail:
 395         TALLOC_FREE(xattr_name);
 396         return result;
 397 }
 398
 399 static int streams_xattr_open(vfs_handle_struct *handle,
 400                               struct smb_filename *smb_fname,
 401                               files_struct *fsp, int flags, mode_t mode)
 402 {
 403         NTSTATUS status;
 404         struct streams_xattr_config *config = NULL;
 405         struct stream_io *sio = NULL;
 406         struct ea_struct ea;
 407         char *xattr_name = NULL;
 408         int pipe_fds[2];
 409         int fakefd = -1;
 410         int ret;
 411
 412         SMB_VFS_HANDLE_GET_DATA(handle, config, struct streams_xattr_config,
 413                                 return -1);
 414
 415         DEBUG(10, ("streams_xattr_open called for %s with flags 0x%x\n",
 416                    smb_fname_str_dbg(smb_fname), flags));
 417
 418         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 419                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 420         }
 421
 422         /* If the default stream is requested, just open the base file. */
 423         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 424                 char *tmp_stream_name;
 425
 426                 tmp_stream_name = smb_fname->stream_name;
 427                 smb_fname->stream_name = NULL;
 428
 429                 ret = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 430
 431                 smb_fname->stream_name = tmp_stream_name;
 432
 433                 return ret;
 434         }
 435
 436         status = streams_xattr_get_name(handle, talloc_tos(),
 437                                         smb_fname->stream_name, &xattr_name);
 438         if (!NT_STATUS_IS_OK(status)) {
 439                 errno = map_errno_from_nt_status(status);
 440                 goto fail;
 441         }
 442
 443         /*
 444          * Return a valid fd, but ensure any attempt to use it returns an error
 445          * (EPIPE).
 446          */
 447         ret = pipe(pipe_fds);
 448         if (ret != 0) {
 449                 goto fail;
 450         }
 451
 452         close(pipe_fds[1]);
 453         pipe_fds[1] = -1;
 454         fakefd = pipe_fds[0];
 455
 456         status = get_ea_value(talloc_tos(), handle->conn, NULL,
 457                               smb_fname, xattr_name, &ea);
 458
 459         DEBUG(10, ("get_ea_value returned %s\n", nt_errstr(status)));
 460
 461         if (!NT_STATUS_IS_OK(status)
 462             && !NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 463                 /*
 464                  * The base file is not there. This is an error even if we got
 465                  * O_CREAT, the higher levels should have created the base
 466                  * file for us.
 467                  */
 468                 DEBUG(10, ("streams_xattr_open: base file %s not around, "
 469                            "returning ENOENT\n", smb_fname->base_name));
 470                 errno = ENOENT;
 471                 goto fail;
 472         }
 473
 474         if ((!NT_STATUS_IS_OK(status) && (flags & O_CREAT)) ||
 475             (flags & O_TRUNC)) {
 476                 /*
 477                  * The attribute does not exist or needs to be truncated
 478                  */
 479
 480                 /*
 481                  * Darn, xattrs need at least 1 byte
 482                  */
 483                 char null = '\0';
 484
 485                 DEBUG(10, ("creating or truncating attribute %s on file %s\n",
 486                            xattr_name, smb_fname->base_name));
 487
 488                 ret = SMB_VFS_SETXATTR(fsp->conn,
 489                                        smb_fname,
 490                                        xattr_name,
 491                                        &null, sizeof(null),
 492                                        flags & O_EXCL ? XATTR_CREATE : 0);
 493                 if (ret != 0) {
 494                         goto fail;
 495                 }
 496         }
 497
 498         sio = VFS_ADD_FSP_EXTENSION(handle, fsp, struct stream_io, NULL);
 499         if (sio == NULL) {
 500                 errno = ENOMEM;
 501                 goto fail;
 502         }
 503
 504         sio->xattr_name = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(handle, fsp),
 505                                         xattr_name);
 506         /*
 507          * so->base needs to be a copy of fsp->fsp_name->base_name,
 508          * making it identical to streams_xattr_recheck(). If the
 509          * open is changing directories, fsp->fsp_name->base_name
 510          * will be the full path from the share root, whilst
 511          * smb_fname will be relative to the $cwd.
 512          */
 513         sio->base = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(handle, fsp),
 514                                   fsp->fsp_name->base_name);
 515         sio->fsp_name_ptr = fsp->fsp_name;
 516         sio->handle = handle;
 517         sio->fsp = fsp;
 518
 519         if ((sio->xattr_name == NULL) || (sio->base == NULL)) {
 520                 errno = ENOMEM;
 521                 goto fail;
 522         }
 523
 524         return fakefd;
 525
 526  fail:
 527         if (fakefd >= 0) {
 528                 close(fakefd);
 529                 fakefd = -1;
 530         }
 531
 532         return -1;
 533 }
 534
 535 static int streams_xattr_unlink(vfs_handle_struct *handle,
 536                                 const struct smb_filename *smb_fname)
 537 {
 538         NTSTATUS status;
 539         int ret = -1;
 540         char *xattr_name = NULL;
 541
 542         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 543                 return SMB_VFS_NEXT_UNLINK(handle, smb_fname);
 544         }
 545
 546         /* If the default stream is requested, just open the base file. */
 547         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 548                 struct smb_filename *smb_fname_base = NULL;
 549
 550                 smb_fname_base = cp_smb_filename(talloc_tos(), smb_fname);
 551                 if (smb_fname_base == NULL) {
 552                         errno = ENOMEM;
 553                         return -1;
 554                 }
 555
 556                 ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname_base);
 557
 558                 TALLOC_FREE(smb_fname_base);
 559                 return ret;
 560         }
 561
 562         status = streams_xattr_get_name(handle, talloc_tos(),
 563                                         smb_fname->stream_name, &xattr_name);
 564         if (!NT_STATUS_IS_OK(status)) {
 565                 errno = map_errno_from_nt_status(status);
 566                 goto fail;
 567         }
 568
 569         ret = SMB_VFS_REMOVEXATTR(handle->conn, smb_fname, xattr_name);
 570
 571         if ((ret == -1) && (errno == ENOATTR)) {
 572                 errno = ENOENT;
 573                 goto fail;
 574         }
 575
 576         ret = 0;
 577
 578  fail:
 579         TALLOC_FREE(xattr_name);
 580         return ret;
 581 }
 582
 583 static int streams_xattr_rename(vfs_handle_struct *handle,
 584                                 const struct smb_filename *smb_fname_src,
 585                                 const struct smb_filename *smb_fname_dst)
 586 {
 587         NTSTATUS status;
 588         int ret = -1;
 589         char *src_xattr_name = NULL;
 590         char *dst_xattr_name = NULL;
 591         bool src_is_stream, dst_is_stream;
 592         ssize_t oret;
 593         ssize_t nret;
 594         struct ea_struct ea;
 595
 596         src_is_stream = is_ntfs_stream_smb_fname(smb_fname_src);
 597         dst_is_stream = is_ntfs_stream_smb_fname(smb_fname_dst);
 598
 599         if (!src_is_stream && !dst_is_stream) {
 600                 return SMB_VFS_NEXT_RENAME(handle, smb_fname_src,
 601                                            smb_fname_dst);
 602         }
 603
 604         /* For now don't allow renames from or to the default stream. */
 605         if (is_ntfs_default_stream_smb_fname(smb_fname_src) ||
 606             is_ntfs_default_stream_smb_fname(smb_fname_dst)) {
 607                 errno = ENOSYS;
 608                 goto done;
 609         }
 610
 611         /* Don't rename if the streams are identical. */
 612         if (strcasecmp_m(smb_fname_src->stream_name,
 613                        smb_fname_dst->stream_name) == 0) {
 614                 goto done;
 615         }
 616
 617         /* Get the xattr names. */
 618         status = streams_xattr_get_name(handle, talloc_tos(),
 619                                         smb_fname_src->stream_name,
 620                                         &src_xattr_name);
 621         if (!NT_STATUS_IS_OK(status)) {
 622                 errno = map_errno_from_nt_status(status);
 623                 goto fail;
 624         }
 625         status = streams_xattr_get_name(handle, talloc_tos(),
 626                                         smb_fname_dst->stream_name,
 627                                         &dst_xattr_name);
 628         if (!NT_STATUS_IS_OK(status)) {
 629                 errno = map_errno_from_nt_status(status);
 630                 goto fail;
 631         }
 632
 633         /* read the old stream */
 634         status = get_ea_value(talloc_tos(), handle->conn, NULL,
 635                               smb_fname_src, src_xattr_name, &ea);
 636         if (!NT_STATUS_IS_OK(status)) {
 637                 errno = ENOENT;
 638                 goto fail;
 639         }
 640
 641         /* (over)write the new stream */
 642         nret = SMB_VFS_SETXATTR(handle->conn, smb_fname_src,
 643                                 dst_xattr_name, ea.value.data, ea.value.length,
 644                                 0);
 645         if (nret < 0) {
 646                 if (errno == ENOATTR) {
 647                         errno = ENOENT;
 648                 }
 649                 goto fail;
 650         }
 651
 652         /* remove the old stream */
 653         oret = SMB_VFS_REMOVEXATTR(handle->conn, smb_fname_src,
 654                                    src_xattr_name);
 655         if (oret < 0) {
 656                 if (errno == ENOATTR) {
 657                         errno = ENOENT;
 658                 }
 659                 goto fail;
 660         }
 661
 662  done:
 663         errno = 0;
 664         ret = 0;
 665  fail:
 666         TALLOC_FREE(src_xattr_name);
 667         TALLOC_FREE(dst_xattr_name);
 668         return ret;
 669 }
 670
 671 static NTSTATUS walk_xattr_streams(vfs_handle_struct *handle,
 672                                 files_struct *fsp,
 673                                 const struct smb_filename *smb_fname,
 674                                 bool (*fn)(struct ea_struct *ea,
 675                                         void *private_data),
 676                                 void *private_data)
 677 {
 678         NTSTATUS status;
 679         char **names;
 680         size_t i, num_names;
 681         struct streams_xattr_config *config;
 682
 683         SMB_VFS_HANDLE_GET_DATA(handle, config, struct streams_xattr_config,
 684                                 return NT_STATUS_UNSUCCESSFUL);
 685
 686         status = get_ea_names_from_file(talloc_tos(),
 687                                 handle->conn,
 688                                 fsp,
 689                                 smb_fname,
 690                                 &names,
 691                                 &num_names);
 692         if (!NT_STATUS_IS_OK(status)) {
 693                 return status;
 694         }
 695
 696         for (i=0; i<num_names; i++) {
 697                 struct ea_struct ea;
 698
 699                 /*
 700                  * We want to check with samba_private_attr_name()
 701                  * whether the xattr name is a private one,
 702                  * unfortunately it flags xattrs that begin with the
 703                  * default streams prefix as private.
 704                  *
 705                  * By only calling samba_private_attr_name() in case
 706                  * the xattr does NOT begin with the default prefix,
 707                  * we know that if it returns 'true' it definitely one
 708                  * of our internal xattr like "user.DOSATTRIB".
 709                  */
 710                 if (strncasecmp_m(names[i], SAMBA_XATTR_DOSSTREAM_PREFIX,
 711                                   strlen(SAMBA_XATTR_DOSSTREAM_PREFIX)) != 0) {
 712                         if (samba_private_attr_name(names[i])) {
 713                                 continue;
 714                         }
 715                 }
 716
 717                 if (strncmp(names[i], config->prefix,
 718                             config->prefix_len) != 0) {
 719                         continue;
 720                 }
 721
 722                 status = get_ea_value(names,
 723                                         handle->conn,
 724                                         NULL,
 725                                         smb_fname,
 726                                         names[i],
 727                                         &ea);
 728                 if (!NT_STATUS_IS_OK(status)) {
 729                         DEBUG(10, ("Could not get ea %s for file %s: %s\n",
 730                                 names[i],
 731                                 smb_fname->base_name,
 732                                 nt_errstr(status)));
 733                         continue;
 734                 }
 735
 736                 ea.name = talloc_asprintf(
 737                         ea.value.data, ":%s%s",
 738                         names[i] + config->prefix_len,
 739                         config->store_stream_type ? "" : ":$DATA");
 740                 if (ea.name == NULL) {
 741                         DEBUG(0, ("talloc failed\n"));
 742                         continue;
 743                 }
 744
 745                 if (!fn(&ea, private_data)) {
 746                         TALLOC_FREE(ea.value.data);
 747                         return NT_STATUS_OK;
 748                 }
 749
 750                 TALLOC_FREE(ea.value.data);
 751         }
 752
 753         TALLOC_FREE(names);
 754         return NT_STATUS_OK;
 755 }
 756
 757 static bool add_one_stream(TALLOC_CTX *mem_ctx, unsigned int *num_streams,
 758                            struct stream_struct **streams,
 759                            const char *name, off_t size,
 760                            off_t alloc_size)
 761 {
 762         struct stream_struct *tmp;
 763
 764         tmp = talloc_realloc(mem_ctx, *streams, struct stream_struct,
 765                                    (*num_streams)+1);
 766         if (tmp == NULL) {
 767                 return false;
 768         }
 769
 770         tmp[*num_streams].name = talloc_strdup(tmp, name);
 771         if (tmp[*num_streams].name == NULL) {
 772                 return false;
 773         }
 774
 775         tmp[*num_streams].size = size;
 776         tmp[*num_streams].alloc_size = alloc_size;
 777
 778         *streams = tmp;
 779         *num_streams += 1;
 780         return true;
 781 }
 782
 783 struct streaminfo_state {
 784         TALLOC_CTX *mem_ctx;
 785         vfs_handle_struct *handle;
 786         unsigned int num_streams;
 787         struct stream_struct *streams;
 788         NTSTATUS status;
 789 };
 790
 791 static bool collect_one_stream(struct ea_struct *ea, void *private_data)
 792 {
 793         struct streaminfo_state *state =
 794                 (struct streaminfo_state *)private_data;
 795
 796         if (!add_one_stream(state->mem_ctx,
 797                             &state->num_streams, &state->streams,
 798                             ea->name, ea->value.length-1,
 799                             smb_roundup(state->handle->conn,
 800                                         ea->value.length-1))) {
 801                 state->status = NT_STATUS_NO_MEMORY;
 802                 return false;
 803         }
 804
 805         return true;
 806 }
 807
 808 static NTSTATUS streams_xattr_streaminfo(vfs_handle_struct *handle,
 809                                          struct files_struct *fsp,
 810                                          const struct smb_filename *smb_fname,
 811                                          TALLOC_CTX *mem_ctx,
 812                                          unsigned int *pnum_streams,
 813                                          struct stream_struct **pstreams)
 814 {
 815         SMB_STRUCT_STAT sbuf;
 816         int ret;
 817         NTSTATUS status;
 818         struct streaminfo_state state;
 819
 820         ret = vfs_stat_smb_basename(handle->conn, smb_fname, &sbuf);
 821         if (ret == -1) {
 822                 return map_nt_error_from_unix(errno);
 823         }
 824
 825         state.streams = *pstreams;
 826         state.num_streams = *pnum_streams;
 827         state.mem_ctx = mem_ctx;
 828         state.handle = handle;
 829         state.status = NT_STATUS_OK;
 830
 831         if (S_ISLNK(sbuf.st_ex_mode)) {
 832                 /*
 833                  * Currently we do't have SMB_VFS_LLISTXATTR
 834                  * inside the VFS which means there's no way
 835                  * to cope with a symlink when lp_posix_pathnames().
 836                  * returns true. For now ignore links.
 837                  * FIXME - by adding SMB_VFS_LLISTXATTR. JRA.
 838                  */
 839                 status = NT_STATUS_OK;
 840         } else {
 841                 status = walk_xattr_streams(handle, fsp, smb_fname,
 842                                     collect_one_stream, &state);
 843         }
 844
 845         if (!NT_STATUS_IS_OK(status)) {
 846                 TALLOC_FREE(state.streams);
 847                 return status;
 848         }
 849
 850         if (!NT_STATUS_IS_OK(state.status)) {
 851                 TALLOC_FREE(state.streams);
 852                 return state.status;
 853         }
 854
 855         *pnum_streams = state.num_streams;
 856         *pstreams = state.streams;
 857
 858         return SMB_VFS_NEXT_STREAMINFO(handle,
 859                         fsp,
 860                         smb_fname,
 861                         mem_ctx,
 862                         pnum_streams,
 863                         pstreams);
 864 }
 865
 866 static uint32_t streams_xattr_fs_capabilities(struct vfs_handle_struct *handle,
 867                         enum timestamp_set_resolution *p_ts_res)
 868 {
 869         return SMB_VFS_NEXT_FS_CAPABILITIES(handle, p_ts_res) | FILE_NAMED_STREAMS;
 870 }
 871
 872 static int streams_xattr_connect(vfs_handle_struct *handle,
 873                                  const char *service, const char *user)
 874 {
 875         struct streams_xattr_config *config;
 876         const char *default_prefix = SAMBA_XATTR_DOSSTREAM_PREFIX;
 877         const char *prefix;
 878         int rc;
 879
 880         rc = SMB_VFS_NEXT_CONNECT(handle, service, user);
 881         if (rc != 0) {
 882                 return rc;
 883         }
 884
 885         config = talloc_zero(handle->conn, struct streams_xattr_config);
 886         if (config == NULL) {
 887                 DEBUG(1, ("talloc_zero() failed\n"));
 888                 errno = ENOMEM;
 889                 return -1;
 890         }
 891
 892         prefix = lp_parm_const_string(SNUM(handle->conn),
 893                                       "streams_xattr", "prefix",
 894                                       default_prefix);
 895         config->prefix = talloc_strdup(config, prefix);
 896         if (config->prefix == NULL) {
 897                 DEBUG(1, ("talloc_strdup() failed\n"));
 898                 errno = ENOMEM;
 899                 return -1;
 900         }
 901         config->prefix_len = strlen(config->prefix);
 902         DEBUG(10, ("streams_xattr using stream prefix: %s\n", config->prefix));
 903
 904         config->store_stream_type = lp_parm_bool(SNUM(handle->conn),
 905                                                  "streams_xattr",
 906                                                  "store_stream_type",
 907                                                  true);
 908
 909         SMB_VFS_HANDLE_SET_DATA(handle, config,
 910                                 NULL, struct stream_xattr_config,
 911                                 return -1);
 912
 913         return 0;
 914 }
 915
 916 static ssize_t streams_xattr_pwrite(vfs_handle_struct *handle,
 917                                     files_struct *fsp, const void *data,
 918                                     size_t n, off_t offset)
 919 {
 920         struct stream_io *sio =
 921                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
 922         struct ea_struct ea;
 923         NTSTATUS status;
 924         struct smb_filename *smb_fname_base = NULL;
 925         int ret;
 926
 927         DEBUG(10, ("streams_xattr_pwrite called for %d bytes\n", (int)n));
 928
 929         if (sio == NULL) {
 930                 return SMB_VFS_NEXT_PWRITE(handle, fsp, data, n, offset);
 931         }
 932
 933         if (!streams_xattr_recheck(sio)) {
 934                 return -1;
 935         }
 936
 937         /* Create an smb_filename with stream_name == NULL. */
 938         smb_fname_base = synthetic_smb_fname(talloc_tos(),
 939                                         sio->base,
 940                                         NULL,
 941                                         NULL,
 942                                         fsp->fsp_name->flags);
 943         if (smb_fname_base == NULL) {
 944                 errno = ENOMEM;
 945                 return -1;
 946         }
 947
 948         status = get_ea_value(talloc_tos(), handle->conn, NULL,
 949                               smb_fname_base, sio->xattr_name, &ea);
 950         if (!NT_STATUS_IS_OK(status)) {
 951                 return -1;
 952         }
 953
 954         if ((offset + n) > ea.value.length-1) {
 955                 uint8_t *tmp;
 956
 957                 tmp = talloc_realloc(talloc_tos(), ea.value.data, uint8_t,
 958                                            offset + n + 1);
 959
 960                 if (tmp == NULL) {
 961                         TALLOC_FREE(ea.value.data);
 962                         errno = ENOMEM;
 963                         return -1;
 964                 }
 965                 ea.value.data = tmp;
 966                 ea.value.length = offset + n + 1;
 967                 ea.value.data[offset+n] = 0;
 968         }
 969
 970         memcpy(ea.value.data + offset, data, n);
 971
 972         ret = SMB_VFS_SETXATTR(fsp->conn,
 973                                fsp->fsp_name,
 974                                sio->xattr_name,
 975                                ea.value.data, ea.value.length, 0);
 976         TALLOC_FREE(ea.value.data);
 977
 978         if (ret == -1) {
 979                 return -1;
 980         }
 981
 982         return n;
 983 }
 984
 985 static ssize_t streams_xattr_pread(vfs_handle_struct *handle,
 986                                    files_struct *fsp, void *data,
 987                                    size_t n, off_t offset)
 988 {
 989         struct stream_io *sio =
 990                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
 991         struct ea_struct ea;
 992         NTSTATUS status;
 993         size_t length, overlap;
 994         struct smb_filename *smb_fname_base = NULL;
 995
 996         DEBUG(10, ("streams_xattr_pread: offset=%d, size=%d\n",
 997                    (int)offset, (int)n));
 998
 999         if (sio == NULL) {
1000                 return SMB_VFS_NEXT_PREAD(handle, fsp, data, n, offset);
1001         }
1002
1003         if (!streams_xattr_recheck(sio)) {
1004                 return -1;
1005         }
1006
1007         /* Create an smb_filename with stream_name == NULL. */
1008         smb_fname_base = synthetic_smb_fname(talloc_tos(),
1009                                         sio->base,
1010                                         NULL,
1011                                         NULL,
1012                                         fsp->fsp_name->flags);
1013         if (smb_fname_base == NULL) {
1014                 errno = ENOMEM;
1015                 return -1;
1016         }
1017
1018         status = get_ea_value(talloc_tos(), handle->conn, NULL,
1019                               smb_fname_base, sio->xattr_name, &ea);
1020         if (!NT_STATUS_IS_OK(status)) {
1021                 return -1;
1022         }
1023
1024         length = ea.value.length-1;
1025
1026         DEBUG(10, ("streams_xattr_pread: get_ea_value returned %d bytes\n",
1027                    (int)length));
1028
1029         /* Attempt to read past EOF. */
1030         if (length <= offset) {
1031                 return 0;
1032         }
1033
1034         overlap = (offset + n) > length ? (length - offset) : n;
1035         memcpy(data, ea.value.data + offset, overlap);
1036
1037         TALLOC_FREE(ea.value.data);
1038         return overlap;
1039 }
1040
1041 struct streams_xattr_pread_state {
1042         ssize_t nread;
1043         struct vfs_aio_state vfs_aio_state;
1044 };
1045
1046 static void streams_xattr_pread_done(struct tevent_req *subreq);
1047
1048 static struct tevent_req *streams_xattr_pread_send(
1049         struct vfs_handle_struct *handle,
1050         TALLOC_CTX *mem_ctx,
1051         struct tevent_context *ev,
1052         struct files_struct *fsp,
1053         void *data,
1054         size_t n, off_t offset)
1055 {
1056         struct tevent_req *req = NULL;
1057         struct tevent_req *subreq = NULL;
1058         struct streams_xattr_pread_state *state = NULL;
1059         struct stream_io *sio =
1060                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1061
1062         req = tevent_req_create(mem_ctx, &state,
1063                                 struct streams_xattr_pread_state);
1064         if (req == NULL) {
1065                 return NULL;
1066         }
1067
1068         if (sio == NULL) {
1069                 subreq = SMB_VFS_NEXT_PREAD_SEND(state, ev, handle, fsp,
1070                                                  data, n, offset);
1071                 if (tevent_req_nomem(req, subreq)) {
1072                         return tevent_req_post(req, ev);
1073                 }
1074                 tevent_req_set_callback(subreq, streams_xattr_pread_done, req);
1075                 return req;
1076         }
1077
1078         state->nread = SMB_VFS_PREAD(fsp, data, n, offset);
1079         if (state->nread != n) {
1080                 if (state->nread != -1) {
1081                         errno = EIO;
1082                 }
1083                 tevent_req_error(req, errno);
1084                 return tevent_req_post(req, ev);
1085         }
1086
1087         tevent_req_done(req);
1088         return tevent_req_post(req, ev);
1089 }
1090
1091 static void streams_xattr_pread_done(struct tevent_req *subreq)
1092 {
1093         struct tevent_req *req = tevent_req_callback_data(
1094                 subreq, struct tevent_req);
1095         struct streams_xattr_pread_state *state = tevent_req_data(
1096                 req, struct streams_xattr_pread_state);
1097
1098         state->nread = SMB_VFS_PREAD_RECV(subreq, &state->vfs_aio_state);
1099         TALLOC_FREE(subreq);
1100
1101         if (tevent_req_error(req, state->vfs_aio_state.error)) {
1102                 return;
1103         }
1104         tevent_req_done(req);
1105 }
1106
1107 static ssize_t streams_xattr_pread_recv(struct tevent_req *req,
1108                                         struct vfs_aio_state *vfs_aio_state)
1109 {
1110         struct streams_xattr_pread_state *state = tevent_req_data(
1111                 req, struct streams_xattr_pread_state);
1112
1113         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
1114                 return -1;
1115         }
1116
1117         *vfs_aio_state = state->vfs_aio_state;
1118         return state->nread;
1119 }
1120
1121 struct streams_xattr_pwrite_state {
1122         ssize_t nwritten;
1123         struct vfs_aio_state vfs_aio_state;
1124 };
1125
1126 static void streams_xattr_pwrite_done(struct tevent_req *subreq);
1127
1128 static struct tevent_req *streams_xattr_pwrite_send(
1129         struct vfs_handle_struct *handle,
1130         TALLOC_CTX *mem_ctx,
1131         struct tevent_context *ev,
1132         struct files_struct *fsp,
1133         const void *data,
1134         size_t n, off_t offset)
1135 {
1136         struct tevent_req *req = NULL;
1137         struct tevent_req *subreq = NULL;
1138         struct streams_xattr_pwrite_state *state = NULL;
1139         struct stream_io *sio =
1140                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1141
1142         req = tevent_req_create(mem_ctx, &state,
1143                                 struct streams_xattr_pwrite_state);
1144         if (req == NULL) {
1145                 return NULL;
1146         }
1147
1148         if (sio == NULL) {
1149                 subreq = SMB_VFS_NEXT_PWRITE_SEND(state, ev, handle, fsp,
1150                                                   data, n, offset);
1151                 if (tevent_req_nomem(req, subreq)) {
1152                         return tevent_req_post(req, ev);
1153                 }
1154                 tevent_req_set_callback(subreq, streams_xattr_pwrite_done, req);
1155                 return req;
1156         }
1157
1158         state->nwritten = SMB_VFS_PWRITE(fsp, data, n, offset);
1159         if (state->nwritten != n) {
1160                 if (state->nwritten != -1) {
1161                         errno = EIO;
1162                 }
1163                 tevent_req_error(req, errno);
1164                 return tevent_req_post(req, ev);
1165         }
1166
1167         tevent_req_done(req);
1168         return tevent_req_post(req, ev);
1169 }
1170
1171 static void streams_xattr_pwrite_done(struct tevent_req *subreq)
1172 {
1173         struct tevent_req *req = tevent_req_callback_data(
1174                 subreq, struct tevent_req);
1175         struct streams_xattr_pwrite_state *state = tevent_req_data(
1176                 req, struct streams_xattr_pwrite_state);
1177
1178         state->nwritten = SMB_VFS_PWRITE_RECV(subreq, &state->vfs_aio_state);
1179         TALLOC_FREE(subreq);
1180
1181         if (tevent_req_error(req, state->vfs_aio_state.error)) {
1182                 return;
1183         }
1184         tevent_req_done(req);
1185 }
1186
1187 static ssize_t streams_xattr_pwrite_recv(struct tevent_req *req,
1188                                          struct vfs_aio_state *vfs_aio_state)
1189 {
1190         struct streams_xattr_pwrite_state *state = tevent_req_data(
1191                 req, struct streams_xattr_pwrite_state);
1192
1193         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
1194                 return -1;
1195         }
1196
1197         *vfs_aio_state = state->vfs_aio_state;
1198         return state->nwritten;
1199 }
1200
1201 static int streams_xattr_ftruncate(struct vfs_handle_struct *handle,
1202                                         struct files_struct *fsp,
1203                                         off_t offset)
1204 {
1205         int ret;
1206         uint8_t *tmp;
1207         struct ea_struct ea;
1208         NTSTATUS status;
1209         struct stream_io *sio =
1210                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1211         struct smb_filename *smb_fname_base = NULL;
1212
1213         DEBUG(10, ("streams_xattr_ftruncate called for file %s offset %.0f\n",
1214                    fsp_str_dbg(fsp), (double)offset));
1215
1216         if (sio == NULL) {
1217                 return SMB_VFS_NEXT_FTRUNCATE(handle, fsp, offset);
1218         }
1219
1220         if (!streams_xattr_recheck(sio)) {
1221                 return -1;
1222         }
1223
1224         /* Create an smb_filename with stream_name == NULL. */
1225         smb_fname_base = synthetic_smb_fname(talloc_tos(),
1226                                         sio->base,
1227                                         NULL,
1228                                         NULL,
1229                                         fsp->fsp_name->flags);
1230         if (smb_fname_base == NULL) {
1231                 errno = ENOMEM;
1232                 return -1;
1233         }
1234
1235         status = get_ea_value(talloc_tos(), handle->conn, NULL,
1236                               smb_fname_base, sio->xattr_name, &ea);
1237         if (!NT_STATUS_IS_OK(status)) {
1238                 return -1;
1239         }
1240
1241         tmp = talloc_realloc(talloc_tos(), ea.value.data, uint8_t,
1242                                    offset + 1);
1243
1244         if (tmp == NULL) {
1245                 TALLOC_FREE(ea.value.data);
1246                 errno = ENOMEM;
1247                 return -1;
1248         }
1249
1250         /* Did we expand ? */
1251         if (ea.value.length < offset + 1) {
1252                 memset(&tmp[ea.value.length], '\0',
1253                         offset + 1 - ea.value.length);
1254         }
1255
1256         ea.value.data = tmp;
1257         ea.value.length = offset + 1;
1258         ea.value.data[offset] = 0;
1259
1260         ret = SMB_VFS_SETXATTR(fsp->conn,
1261                                fsp->fsp_name,
1262                                sio->xattr_name,
1263                                ea.value.data, ea.value.length, 0);
1264         TALLOC_FREE(ea.value.data);
1265
1266         if (ret == -1) {
1267                 return -1;
1268         }
1269
1270         return 0;
1271 }
1272
1273 static int streams_xattr_fallocate(struct vfs_handle_struct *handle,
1274                                         struct files_struct *fsp,
1275                                         uint32_t mode,
1276                                         off_t offset,
1277                                         off_t len)
1278 {
1279         struct stream_io *sio =
1280                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1281
1282         DEBUG(10, ("streams_xattr_fallocate called for file %s offset %.0f"
1283                 "len = %.0f\n",
1284                 fsp_str_dbg(fsp), (double)offset, (double)len));
1285
1286         if (sio == NULL) {
1287                 return SMB_VFS_NEXT_FALLOCATE(handle, fsp, mode, offset, len);
1288         }
1289
1290         if (!streams_xattr_recheck(sio)) {
1291                 return -1;
1292         }
1293
1294         /* Let the pwrite code path handle it. */
1295         errno = ENOSYS;
1296         return -1;
1297 }
1298
1299 static int streams_xattr_fchown(vfs_handle_struct *handle, files_struct *fsp,
1300                                 uid_t uid, gid_t gid)
1301 {
1302         struct stream_io *sio =
1303                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1304
1305         if (sio == NULL) {
1306                 return SMB_VFS_NEXT_FCHOWN(handle, fsp, uid, gid);
1307         }
1308
1309         return 0;
1310 }
1311
1312 static int streams_xattr_fchmod(vfs_handle_struct *handle,
1313                                 files_struct *fsp,
1314                                 mode_t mode)
1315 {
1316         struct stream_io *sio =
1317                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1318
1319         if (sio == NULL) {
1320                 return SMB_VFS_NEXT_FCHMOD(handle, fsp, mode);
1321         }
1322
1323         return 0;
1324 }
1325
1326 static ssize_t streams_xattr_fgetxattr(struct vfs_handle_struct *handle,
1327                                        struct files_struct *fsp,
1328                                        const char *name,
1329                                        void *value,
1330                                        size_t size)
1331 {
1332         struct stream_io *sio =
1333                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1334
1335         if (sio == NULL) {
1336                 return SMB_VFS_NEXT_FGETXATTR(handle, fsp, name, value, size);
1337         }
1338
1339         errno = ENOTSUP;
1340         return -1;
1341 }
1342
1343 static ssize_t streams_xattr_flistxattr(struct vfs_handle_struct *handle,
1344                                         struct files_struct *fsp,
1345                                         char *list,
1346                                         size_t size)
1347 {
1348         struct stream_io *sio =
1349                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1350
1351         if (sio == NULL) {
1352                 return SMB_VFS_NEXT_FLISTXATTR(handle, fsp, list, size);
1353         }
1354
1355         errno = ENOTSUP;
1356         return -1;
1357 }
1358
1359 static int streams_xattr_fremovexattr(struct vfs_handle_struct *handle,
1360                                       struct files_struct *fsp,
1361                                       const char *name)
1362 {
1363         struct stream_io *sio =
1364                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1365
1366         if (sio == NULL) {
1367                 return SMB_VFS_NEXT_FREMOVEXATTR(handle, fsp, name);
1368         }
1369
1370         errno = ENOTSUP;
1371         return -1;
1372 }
1373
1374 static int streams_xattr_fsetxattr(struct vfs_handle_struct *handle,
1375                                    struct files_struct *fsp,
1376                                    const char *name,
1377                                    const void *value,
1378                                    size_t size,
1379                                    int flags)
1380 {
1381         struct stream_io *sio =
1382                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1383
1384         if (sio == NULL) {
1385                 return SMB_VFS_NEXT_FSETXATTR(handle, fsp, name, value,
1386                                               size, flags);
1387         }
1388
1389         errno = ENOTSUP;
1390         return -1;
1391 }
1392
1393 static int streams_xattr_fchmod_acl(vfs_handle_struct *handle,
1394                                     files_struct *fsp,
1395                                     mode_t mode)
1396 {
1397         struct stream_io *sio =
1398                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1399
1400         if (sio == NULL) {
1401                 return SMB_VFS_NEXT_FCHMOD_ACL(handle, fsp, mode);
1402         }
1403
1404         return 0;
1405 }
1406
1407 static SMB_ACL_T streams_xattr_sys_acl_get_fd(vfs_handle_struct *handle,
1408                                               files_struct *fsp,
1409                                               TALLOC_CTX *mem_ctx)
1410 {
1411         struct stream_io *sio =
1412                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1413
1414         if (sio == NULL) {
1415                 return SMB_VFS_NEXT_SYS_ACL_GET_FD(handle, fsp, mem_ctx);
1416         }
1417
1418         return SMB_VFS_NEXT_SYS_ACL_GET_FILE(
1419                 handle, fsp->base_fsp->fsp_name,
1420                 SMB_ACL_TYPE_ACCESS, mem_ctx);
1421 }
1422
1423 static int streams_xattr_sys_acl_set_fd(vfs_handle_struct *handle,
1424                                         files_struct *fsp,
1425                                         SMB_ACL_T theacl)
1426 {
1427         struct stream_io *sio =
1428                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1429
1430         if (sio == NULL) {
1431                 return SMB_VFS_NEXT_SYS_ACL_SET_FD(handle, fsp, theacl);
1432         }
1433
1434         return 0;
1435 }
1436
1437 static int streams_xattr_sys_acl_blob_get_fd(vfs_handle_struct *handle,
1438                                              files_struct *fsp,
1439                                              TALLOC_CTX *mem_ctx,
1440                                              char **blob_description,
1441                                              DATA_BLOB *blob)
1442 {
1443         struct stream_io *sio =
1444                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1445
1446         if (sio == NULL) {
1447                 return SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FD(handle, fsp, mem_ctx,
1448                                                         blob_description, blob);
1449         }
1450
1451         return SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FILE(
1452                 handle, fsp->base_fsp->fsp_name, mem_ctx,
1453                 blob_description, blob);
1454 }
1455
1456 static NTSTATUS streams_xattr_fget_nt_acl(vfs_handle_struct *handle,
1457                                           files_struct *fsp,
1458                                           uint32_t security_info,
1459                                           TALLOC_CTX *mem_ctx,
1460                                           struct security_descriptor **ppdesc)
1461 {
1462         struct stream_io *sio =
1463                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1464
1465         if (sio == NULL) {
1466                 return SMB_VFS_NEXT_FGET_NT_ACL(handle, fsp, security_info,
1467                                                 mem_ctx, ppdesc);
1468         }
1469
1470         return SMB_VFS_NEXT_GET_NT_ACL(handle, fsp->base_fsp->fsp_name,
1471                                        security_info, mem_ctx, ppdesc);
1472 }
1473
1474 static NTSTATUS streams_xattr_fset_nt_acl(vfs_handle_struct *handle,
1475                                           files_struct *fsp,
1476                                           uint32_t security_info_sent,
1477                                           const struct security_descriptor *psd)
1478 {
1479         struct stream_io *sio =
1480                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1481
1482         if (sio == NULL) {
1483                 return SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp,
1484                                                 security_info_sent, psd);
1485         }
1486
1487         return NT_STATUS_OK;
1488 }
1489
1490 struct streams_xattr_fsync_state {
1491         int ret;
1492         struct vfs_aio_state vfs_aio_state;
1493 };
1494
1495 static void streams_xattr_fsync_done(struct tevent_req *subreq);
1496
1497 static struct tevent_req *streams_xattr_fsync_send(
1498         struct vfs_handle_struct *handle,
1499         TALLOC_CTX *mem_ctx,
1500         struct tevent_context *ev,
1501         struct files_struct *fsp)
1502 {
1503         struct tevent_req *req = NULL;
1504         struct tevent_req *subreq = NULL;
1505         struct streams_xattr_fsync_state *state = NULL;
1506         struct stream_io *sio =
1507                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1508
1509         req = tevent_req_create(mem_ctx, &state,
1510                                 struct streams_xattr_fsync_state);
1511         if (req == NULL) {
1512                 return NULL;
1513         }
1514
1515         if (sio == NULL) {
1516                 subreq = SMB_VFS_NEXT_FSYNC_SEND(state, ev, handle, fsp);
1517                 if (tevent_req_nomem(req, subreq)) {
1518                         return tevent_req_post(req, ev);
1519                 }
1520                 tevent_req_set_callback(subreq, streams_xattr_fsync_done, req);
1521                 return req;
1522         }
1523
1524         /*
1525          * There's no pathname based sync variant and we don't have access to
1526          * the basefile handle, so we can't do anything here.
1527          */
1528
1529         tevent_req_done(req);
1530         return tevent_req_post(req, ev);
1531 }
1532
1533 static void streams_xattr_fsync_done(struct tevent_req *subreq)
1534 {
1535         struct tevent_req *req = tevent_req_callback_data(
1536                 subreq, struct tevent_req);
1537         struct streams_xattr_fsync_state *state = tevent_req_data(
1538                 req, struct streams_xattr_fsync_state);
1539
1540         state->ret = SMB_VFS_FSYNC_RECV(subreq, &state->vfs_aio_state);
1541         TALLOC_FREE(subreq);
1542         if (state->ret != 0) {
1543                 tevent_req_error(req, errno);
1544                 return;
1545         }
1546
1547         tevent_req_done(req);
1548 }
1549
1550 static int streams_xattr_fsync_recv(struct tevent_req *req,
1551                                     struct vfs_aio_state *vfs_aio_state)
1552 {
1553         struct streams_xattr_fsync_state *state = tevent_req_data(
1554                 req, struct streams_xattr_fsync_state);
1555
1556         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
1557                 return -1;
1558         }
1559
1560         *vfs_aio_state = state->vfs_aio_state;
1561         return state->ret;
1562 }
1563
1564 static bool streams_xattr_lock(vfs_handle_struct *handle,
1565                                files_struct *fsp,
1566                                int op,
1567                                off_t offset,
1568                                off_t count,
1569                                int type)
1570 {
1571         struct stream_io *sio =
1572                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1573
1574         if (sio == NULL) {
1575                 return SMB_VFS_NEXT_LOCK(handle, fsp, op, offset, count, type);
1576         }
1577
1578         return true;
1579 }
1580
1581 static bool streams_xattr_getlock(vfs_handle_struct *handle,
1582                                   files_struct *fsp,
1583                                   off_t *poffset,
1584                                   off_t *pcount,
1585                                   int *ptype,
1586                                   pid_t *ppid)
1587 {
1588         struct stream_io *sio =
1589                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1590
1591         if (sio == NULL) {
1592                 return SMB_VFS_NEXT_GETLOCK(handle, fsp, poffset,
1593                                             pcount, ptype, ppid);
1594         }
1595
1596         errno = ENOTSUP;
1597         return false;
1598 }
1599
1600 static int streams_xattr_kernel_flock(vfs_handle_struct *handle,
1601                                       files_struct *fsp,
1602                                       uint32_t share_mode,
1603                                       uint32_t access_mask)
1604 {
1605         struct stream_io *sio =
1606                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1607
1608         if (sio == NULL) {
1609                 return SMB_VFS_NEXT_KERNEL_FLOCK(handle, fsp,
1610                                                  share_mode, access_mask);
1611         }
1612
1613         return 0;
1614 }
1615
1616 static int streams_xattr_linux_setlease(vfs_handle_struct *handle,
1617                                         files_struct *fsp,
1618                                         int leasetype)
1619 {
1620         struct stream_io *sio =
1621                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1622
1623         if (sio == NULL) {
1624                 return SMB_VFS_NEXT_LINUX_SETLEASE(handle, fsp, leasetype);
1625         }
1626
1627         return 0;
1628 }
1629
1630 static bool streams_xattr_strict_lock_check(struct vfs_handle_struct *handle,
1631                                             files_struct *fsp,
1632                                             struct lock_struct *plock)
1633 {
1634         struct stream_io *sio =
1635                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1636
1637         if (sio == NULL) {
1638                 return SMB_VFS_NEXT_STRICT_LOCK_CHECK(handle, fsp, plock);
1639         }
1640
1641         return true;
1642 }
1643
1644 static struct vfs_fn_pointers vfs_streams_xattr_fns = {
1645         .fs_capabilities_fn = streams_xattr_fs_capabilities,
1646         .connect_fn = streams_xattr_connect,
1647         .open_fn = streams_xattr_open,
1648         .stat_fn = streams_xattr_stat,
1649         .fstat_fn = streams_xattr_fstat,
1650         .lstat_fn = streams_xattr_lstat,
1651         .pread_fn = streams_xattr_pread,
1652         .pwrite_fn = streams_xattr_pwrite,
1653         .pread_send_fn = streams_xattr_pread_send,
1654         .pread_recv_fn = streams_xattr_pread_recv,
1655         .pwrite_send_fn = streams_xattr_pwrite_send,
1656         .pwrite_recv_fn = streams_xattr_pwrite_recv,
1657         .unlink_fn = streams_xattr_unlink,
1658         .rename_fn = streams_xattr_rename,
1659         .ftruncate_fn = streams_xattr_ftruncate,
1660         .fallocate_fn = streams_xattr_fallocate,
1661         .streaminfo_fn = streams_xattr_streaminfo,
1662
1663         .fsync_send_fn = streams_xattr_fsync_send,
1664         .fsync_recv_fn = streams_xattr_fsync_recv,
1665
1666         .lock_fn = streams_xattr_lock,
1667         .getlock_fn = streams_xattr_getlock,
1668         .kernel_flock_fn = streams_xattr_kernel_flock,
1669         .linux_setlease_fn = streams_xattr_linux_setlease,
1670         .strict_lock_check_fn = streams_xattr_strict_lock_check,
1671
1672         .fchown_fn = streams_xattr_fchown,
1673         .fchmod_fn = streams_xattr_fchmod,
1674
1675         .fgetxattr_fn = streams_xattr_fgetxattr,
1676         .flistxattr_fn = streams_xattr_flistxattr,
1677         .fremovexattr_fn = streams_xattr_fremovexattr,
1678         .fsetxattr_fn = streams_xattr_fsetxattr,
1679
1680         .fchmod_acl_fn = streams_xattr_fchmod_acl,
1681
1682         .sys_acl_get_fd_fn = streams_xattr_sys_acl_get_fd,
1683         .sys_acl_blob_get_fd_fn = streams_xattr_sys_acl_blob_get_fd,
1684         .sys_acl_set_fd_fn = streams_xattr_sys_acl_set_fd,
1685
1686         .fget_nt_acl_fn = streams_xattr_fget_nt_acl,
1687         .fset_nt_acl_fn = streams_xattr_fset_nt_acl,
1688 };
1689
1690 static_decl_vfs;
1691 NTSTATUS vfs_streams_xattr_init(TALLOC_CTX *ctx)
1692 {
1693         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "streams_xattr",
1694                                 &vfs_streams_xattr_fns);
1695 }