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