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         if (sio->xattr_name == NULL) {
 194                 DBG_DEBUG("sio->xattr_name==NULL\n");
 195                 return false;
 196         }
 197         TALLOC_FREE(xattr_name);
 198
 199         sio->base = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(sio->handle, sio->fsp),
 200                                   sio->fsp->fsp_name->base_name);
 201         if (sio->base == NULL) {
 202                 DBG_DEBUG("sio->base==NULL\n");
 203                 return false;
 204         }
 205
 206         sio->fsp_name_ptr = sio->fsp->fsp_name;
 207
 208         return true;
 209 }
 210
 211 /**
 212  * Helper to stat/lstat the base file of an smb_fname.
 213  */
 214 static int streams_xattr_stat_base(vfs_handle_struct *handle,
 215                                    struct smb_filename *smb_fname,
 216                                    bool follow_links)
 217 {
 218         char *tmp_stream_name;
 219         int result;
 220
 221         tmp_stream_name = smb_fname->stream_name;
 222         smb_fname->stream_name = NULL;
 223         if (follow_links) {
 224                 result = SMB_VFS_NEXT_STAT(handle, smb_fname);
 225         } else {
 226                 result = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 227         }
 228         smb_fname->stream_name = tmp_stream_name;
 229         return result;
 230 }
 231
 232 static int streams_xattr_fstat(vfs_handle_struct *handle, files_struct *fsp,
 233                                SMB_STRUCT_STAT *sbuf)
 234 {
 235         struct smb_filename *smb_fname_base = NULL;
 236         int ret = -1;
 237         struct stream_io *io = (struct stream_io *)
 238                 VFS_FETCH_FSP_EXTENSION(handle, fsp);
 239
 240         if (io == NULL || fsp->base_fsp == NULL) {
 241                 return SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
 242         }
 243
 244         DBG_DEBUG("streams_xattr_fstat called for %s\n", fsp_str_dbg(io->fsp));
 245
 246         if (!streams_xattr_recheck(io)) {
 247                 return -1;
 248         }
 249
 250         /* Create an smb_filename with stream_name == NULL. */
 251         smb_fname_base = synthetic_smb_fname(talloc_tos(),
 252                                         io->base,
 253                                         NULL,
 254                                         NULL,
 255                                         fsp->fsp_name->flags);
 256         if (smb_fname_base == NULL) {
 257                 errno = ENOMEM;
 258                 return -1;
 259         }
 260
 261         if (smb_fname_base->flags & SMB_FILENAME_POSIX_PATH) {
 262                 ret = SMB_VFS_LSTAT(handle->conn, smb_fname_base);
 263         } else {
 264                 ret = SMB_VFS_STAT(handle->conn, smb_fname_base);
 265         }
 266         *sbuf = smb_fname_base->st;
 267
 268         if (ret == -1) {
 269                 TALLOC_FREE(smb_fname_base);
 270                 return -1;
 271         }
 272
 273         sbuf->st_ex_size = get_xattr_size(handle->conn,
 274                                         smb_fname_base, io->xattr_name);
 275         if (sbuf->st_ex_size == -1) {
 276                 TALLOC_FREE(smb_fname_base);
 277                 SET_STAT_INVALID(*sbuf);
 278                 return -1;
 279         }
 280
 281         DEBUG(10, ("sbuf->st_ex_size = %d\n", (int)sbuf->st_ex_size));
 282
 283         sbuf->st_ex_ino = stream_inode(sbuf, io->xattr_name);
 284         sbuf->st_ex_mode &= ~S_IFMT;
 285         sbuf->st_ex_mode &= ~S_IFDIR;
 286         sbuf->st_ex_mode |= S_IFREG;
 287         sbuf->st_ex_blocks = sbuf->st_ex_size / STAT_ST_BLOCKSIZE + 1;
 288
 289         TALLOC_FREE(smb_fname_base);
 290         return 0;
 291 }
 292
 293 static int streams_xattr_stat(vfs_handle_struct *handle,
 294                               struct smb_filename *smb_fname)
 295 {
 296         NTSTATUS status;
 297         int result = -1;
 298         char *xattr_name = NULL;
 299
 300         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 301                 return SMB_VFS_NEXT_STAT(handle, smb_fname);
 302         }
 303
 304         /* Note if lp_posix_paths() is true, we can never
 305          * get here as is_ntfs_stream_smb_fname() is
 306          * always false. So we never need worry about
 307          * not following links here. */
 308
 309         /* If the default stream is requested, just stat the base file. */
 310         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 311                 return streams_xattr_stat_base(handle, smb_fname, true);
 312         }
 313
 314         /* Populate the stat struct with info from the base file. */
 315         if (streams_xattr_stat_base(handle, smb_fname, true) == -1) {
 316                 return -1;
 317         }
 318
 319         /* Derive the xattr name to lookup. */
 320         status = streams_xattr_get_name(handle, talloc_tos(),
 321                                         smb_fname->stream_name, &xattr_name);
 322         if (!NT_STATUS_IS_OK(status)) {
 323                 errno = map_errno_from_nt_status(status);
 324                 return -1;
 325         }
 326
 327         /* Augment the base file's stat information before returning. */
 328         smb_fname->st.st_ex_size = get_xattr_size(handle->conn,
 329                                                   smb_fname,
 330                                                   xattr_name);
 331         if (smb_fname->st.st_ex_size == -1) {
 332                 SET_STAT_INVALID(smb_fname->st);
 333                 errno = ENOENT;
 334                 result = -1;
 335                 goto fail;
 336         }
 337
 338         smb_fname->st.st_ex_ino = stream_inode(&smb_fname->st, xattr_name);
 339         smb_fname->st.st_ex_mode &= ~S_IFMT;
 340         smb_fname->st.st_ex_mode &= ~S_IFDIR;
 341         smb_fname->st.st_ex_mode |= S_IFREG;
 342         smb_fname->st.st_ex_blocks =
 343             smb_fname->st.st_ex_size / STAT_ST_BLOCKSIZE + 1;
 344
 345         result = 0;
 346  fail:
 347         TALLOC_FREE(xattr_name);
 348         return result;
 349 }
 350
 351 static int streams_xattr_lstat(vfs_handle_struct *handle,
 352                                struct smb_filename *smb_fname)
 353 {
 354         NTSTATUS status;
 355         int result = -1;
 356         char *xattr_name = NULL;
 357
 358         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 359                 return SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 360         }
 361
 362         /* If the default stream is requested, just stat the base file. */
 363         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 364                 return streams_xattr_stat_base(handle, smb_fname, false);
 365         }
 366
 367         /* Populate the stat struct with info from the base file. */
 368         if (streams_xattr_stat_base(handle, smb_fname, false) == -1) {
 369                 return -1;
 370         }
 371
 372         /* Derive the xattr name to lookup. */
 373         status = streams_xattr_get_name(handle, talloc_tos(),
 374                                         smb_fname->stream_name, &xattr_name);
 375         if (!NT_STATUS_IS_OK(status)) {
 376                 errno = map_errno_from_nt_status(status);
 377                 return -1;
 378         }
 379
 380         /* Augment the base file's stat information before returning. */
 381         smb_fname->st.st_ex_size = get_xattr_size(handle->conn,
 382                                                   smb_fname,
 383                                                   xattr_name);
 384         if (smb_fname->st.st_ex_size == -1) {
 385                 SET_STAT_INVALID(smb_fname->st);
 386                 errno = ENOENT;
 387                 result = -1;
 388                 goto fail;
 389         }
 390
 391         smb_fname->st.st_ex_ino = stream_inode(&smb_fname->st, xattr_name);
 392         smb_fname->st.st_ex_mode &= ~S_IFMT;
 393         smb_fname->st.st_ex_mode |= S_IFREG;
 394         smb_fname->st.st_ex_blocks =
 395             smb_fname->st.st_ex_size / STAT_ST_BLOCKSIZE + 1;
 396
 397         result = 0;
 398
 399  fail:
 400         TALLOC_FREE(xattr_name);
 401         return result;
 402 }
 403
 404 static int streams_xattr_open(vfs_handle_struct *handle,
 405                               struct smb_filename *smb_fname,
 406                               files_struct *fsp, int flags, mode_t mode)
 407 {
 408         NTSTATUS status;
 409         struct streams_xattr_config *config = NULL;
 410         struct stream_io *sio = NULL;
 411         struct ea_struct ea;
 412         char *xattr_name = NULL;
 413         int pipe_fds[2];
 414         int fakefd = -1;
 415         bool set_empty_xattr = false;
 416         int ret;
 417
 418         SMB_VFS_HANDLE_GET_DATA(handle, config, struct streams_xattr_config,
 419                                 return -1);
 420
 421         DEBUG(10, ("streams_xattr_open called for %s with flags 0x%x\n",
 422                    smb_fname_str_dbg(smb_fname), flags));
 423
 424         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 425                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 426         }
 427
 428         /* If the default stream is requested, just open the base file. */
 429         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 430                 char *tmp_stream_name;
 431
 432                 tmp_stream_name = smb_fname->stream_name;
 433                 smb_fname->stream_name = NULL;
 434
 435                 ret = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 436
 437                 smb_fname->stream_name = tmp_stream_name;
 438
 439                 return ret;
 440         }
 441
 442         status = streams_xattr_get_name(handle, talloc_tos(),
 443                                         smb_fname->stream_name, &xattr_name);
 444         if (!NT_STATUS_IS_OK(status)) {
 445                 errno = map_errno_from_nt_status(status);
 446                 goto fail;
 447         }
 448
 449         status = get_ea_value(talloc_tos(), handle->conn, NULL,
 450                               smb_fname, xattr_name, &ea);
 451
 452         DEBUG(10, ("get_ea_value returned %s\n", nt_errstr(status)));
 453
 454         if (!NT_STATUS_IS_OK(status)) {
 455                 if (!NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 456                         /*
 457                          * The base file is not there. This is an error even if
 458                          * we got O_CREAT, the higher levels should have created
 459                          * the base file for us.
 460                          */
 461                         DBG_DEBUG("streams_xattr_open: base file %s not around, "
 462                                   "returning ENOENT\n", smb_fname->base_name);
 463                         errno = ENOENT;
 464                         goto fail;
 465                 }
 466
 467                 if (!(flags & O_CREAT)) {
 468                         errno = ENOATTR;
 469                         goto fail;
 470                 }
 471
 472                 set_empty_xattr = true;
 473         }
 474
 475         if (flags & O_TRUNC) {
 476                 set_empty_xattr = true;
 477         }
 478
 479         if (set_empty_xattr) {
 480                 /*
 481                  * The attribute does not exist or needs to be truncated
 482                  */
 483
 484                 /*
 485                  * Darn, xattrs need at least 1 byte
 486                  */
 487                 char null = '\0';
 488
 489                 DEBUG(10, ("creating or truncating attribute %s on file %s\n",
 490                            xattr_name, smb_fname->base_name));
 491
 492                 ret = SMB_VFS_SETXATTR(fsp->conn,
 493                                        smb_fname,
 494                                        xattr_name,
 495                                        &null, sizeof(null),
 496                                        flags & O_EXCL ? XATTR_CREATE : 0);
 497                 if (ret != 0) {
 498                         goto fail;
 499                 }
 500         }
 501
 502         /*
 503          * Return a valid fd, but ensure any attempt to use it returns an error
 504          * (EPIPE).
 505          */
 506         ret = pipe(pipe_fds);
 507         if (ret != 0) {
 508                 goto fail;
 509         }
 510
 511         close(pipe_fds[1]);
 512         pipe_fds[1] = -1;
 513         fakefd = pipe_fds[0];
 514
 515         sio = VFS_ADD_FSP_EXTENSION(handle, fsp, struct stream_io, NULL);
 516         if (sio == NULL) {
 517                 errno = ENOMEM;
 518                 goto fail;
 519         }
 520
 521         sio->xattr_name = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(handle, fsp),
 522                                         xattr_name);
 523         if (sio->xattr_name == NULL) {
 524                 errno = ENOMEM;
 525                 goto fail;
 526         }
 527
 528         /*
 529          * so->base needs to be a copy of fsp->fsp_name->base_name,
 530          * making it identical to streams_xattr_recheck(). If the
 531          * open is changing directories, fsp->fsp_name->base_name
 532          * will be the full path from the share root, whilst
 533          * smb_fname will be relative to the $cwd.
 534          */
 535         sio->base = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(handle, fsp),
 536                                   fsp->fsp_name->base_name);
 537         if (sio->base == NULL) {
 538                 errno = ENOMEM;
 539                 goto fail;
 540         }
 541
 542         sio->fsp_name_ptr = fsp->fsp_name;
 543         sio->handle = handle;
 544         sio->fsp = fsp;
 545
 546         return fakefd;
 547
 548  fail:
 549         if (fakefd >= 0) {
 550                 close(fakefd);
 551                 fakefd = -1;
 552         }
 553
 554         return -1;
 555 }
 556
 557 static int streams_xattr_close(vfs_handle_struct *handle,
 558                                files_struct *fsp)
 559 {
 560         int ret;
 561         int fd;
 562
 563         fd = fsp->fh->fd;
 564
 565         DBG_DEBUG("streams_xattr_close called [%s] fd [%d]\n",
 566                         smb_fname_str_dbg(fsp->fsp_name), fd);
 567
 568         if (!is_ntfs_stream_smb_fname(fsp->fsp_name)) {
 569                 return SMB_VFS_NEXT_CLOSE(handle, fsp);
 570         }
 571
 572         if (is_ntfs_default_stream_smb_fname(fsp->fsp_name)) {
 573                 return SMB_VFS_NEXT_CLOSE(handle, fsp);
 574         }
 575
 576         ret = close(fd);
 577         fsp->fh->fd = -1;
 578
 579         return ret;
 580 }
 581
 582 static int streams_xattr_unlink(vfs_handle_struct *handle,
 583                                 const struct smb_filename *smb_fname)
 584 {
 585         NTSTATUS status;
 586         int ret = -1;
 587         char *xattr_name = NULL;
 588
 589         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 590                 return SMB_VFS_NEXT_UNLINK(handle, smb_fname);
 591         }
 592
 593         /* If the default stream is requested, just open the base file. */
 594         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 595                 struct smb_filename *smb_fname_base = NULL;
 596
 597                 smb_fname_base = cp_smb_filename(talloc_tos(), smb_fname);
 598                 if (smb_fname_base == NULL) {
 599                         errno = ENOMEM;
 600                         return -1;
 601                 }
 602
 603                 ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname_base);
 604
 605                 TALLOC_FREE(smb_fname_base);
 606                 return ret;
 607         }
 608
 609         status = streams_xattr_get_name(handle, talloc_tos(),
 610                                         smb_fname->stream_name, &xattr_name);
 611         if (!NT_STATUS_IS_OK(status)) {
 612                 errno = map_errno_from_nt_status(status);
 613                 goto fail;
 614         }
 615
 616         ret = SMB_VFS_REMOVEXATTR(handle->conn, smb_fname, xattr_name);
 617
 618         if ((ret == -1) && (errno == ENOATTR)) {
 619                 errno = ENOENT;
 620                 goto fail;
 621         }
 622
 623         ret = 0;
 624
 625  fail:
 626         TALLOC_FREE(xattr_name);
 627         return ret;
 628 }
 629
 630 static int streams_xattr_rename(vfs_handle_struct *handle,
 631                                 const struct smb_filename *smb_fname_src,
 632                                 const struct smb_filename *smb_fname_dst)
 633 {
 634         NTSTATUS status;
 635         int ret = -1;
 636         char *src_xattr_name = NULL;
 637         char *dst_xattr_name = NULL;
 638         bool src_is_stream, dst_is_stream;
 639         ssize_t oret;
 640         ssize_t nret;
 641         struct ea_struct ea;
 642
 643         src_is_stream = is_ntfs_stream_smb_fname(smb_fname_src);
 644         dst_is_stream = is_ntfs_stream_smb_fname(smb_fname_dst);
 645
 646         if (!src_is_stream && !dst_is_stream) {
 647                 return SMB_VFS_NEXT_RENAME(handle, smb_fname_src,
 648                                            smb_fname_dst);
 649         }
 650
 651         /* For now don't allow renames from or to the default stream. */
 652         if (is_ntfs_default_stream_smb_fname(smb_fname_src) ||
 653             is_ntfs_default_stream_smb_fname(smb_fname_dst)) {
 654                 errno = ENOSYS;
 655                 goto done;
 656         }
 657
 658         /* Don't rename if the streams are identical. */
 659         if (strcasecmp_m(smb_fname_src->stream_name,
 660                        smb_fname_dst->stream_name) == 0) {
 661                 goto done;
 662         }
 663
 664         /* Get the xattr names. */
 665         status = streams_xattr_get_name(handle, talloc_tos(),
 666                                         smb_fname_src->stream_name,
 667                                         &src_xattr_name);
 668         if (!NT_STATUS_IS_OK(status)) {
 669                 errno = map_errno_from_nt_status(status);
 670                 goto fail;
 671         }
 672         status = streams_xattr_get_name(handle, talloc_tos(),
 673                                         smb_fname_dst->stream_name,
 674                                         &dst_xattr_name);
 675         if (!NT_STATUS_IS_OK(status)) {
 676                 errno = map_errno_from_nt_status(status);
 677                 goto fail;
 678         }
 679
 680         /* read the old stream */
 681         status = get_ea_value(talloc_tos(), handle->conn, NULL,
 682                               smb_fname_src, src_xattr_name, &ea);
 683         if (!NT_STATUS_IS_OK(status)) {
 684                 errno = ENOENT;
 685                 goto fail;
 686         }
 687
 688         /* (over)write the new stream */
 689         nret = SMB_VFS_SETXATTR(handle->conn, smb_fname_src,
 690                                 dst_xattr_name, ea.value.data, ea.value.length,
 691                                 0);
 692         if (nret < 0) {
 693                 if (errno == ENOATTR) {
 694                         errno = ENOENT;
 695                 }
 696                 goto fail;
 697         }
 698
 699         /* remove the old stream */
 700         oret = SMB_VFS_REMOVEXATTR(handle->conn, smb_fname_src,
 701                                    src_xattr_name);
 702         if (oret < 0) {
 703                 if (errno == ENOATTR) {
 704                         errno = ENOENT;
 705                 }
 706                 goto fail;
 707         }
 708
 709  done:
 710         errno = 0;
 711         ret = 0;
 712  fail:
 713         TALLOC_FREE(src_xattr_name);
 714         TALLOC_FREE(dst_xattr_name);
 715         return ret;
 716 }
 717
 718 static NTSTATUS walk_xattr_streams(vfs_handle_struct *handle,
 719                                 files_struct *fsp,
 720                                 const struct smb_filename *smb_fname,
 721                                 bool (*fn)(struct ea_struct *ea,
 722                                         void *private_data),
 723                                 void *private_data)
 724 {
 725         NTSTATUS status;
 726         char **names;
 727         size_t i, num_names;
 728         struct streams_xattr_config *config;
 729
 730         SMB_VFS_HANDLE_GET_DATA(handle, config, struct streams_xattr_config,
 731                                 return NT_STATUS_UNSUCCESSFUL);
 732
 733         status = get_ea_names_from_file(talloc_tos(),
 734                                 handle->conn,
 735                                 fsp,
 736                                 smb_fname,
 737                                 &names,
 738                                 &num_names);
 739         if (!NT_STATUS_IS_OK(status)) {
 740                 return status;
 741         }
 742
 743         for (i=0; i<num_names; i++) {
 744                 struct ea_struct ea;
 745
 746                 /*
 747                  * We want to check with samba_private_attr_name()
 748                  * whether the xattr name is a private one,
 749                  * unfortunately it flags xattrs that begin with the
 750                  * default streams prefix as private.
 751                  *
 752                  * By only calling samba_private_attr_name() in case
 753                  * the xattr does NOT begin with the default prefix,
 754                  * we know that if it returns 'true' it definitely one
 755                  * of our internal xattr like "user.DOSATTRIB".
 756                  */
 757                 if (strncasecmp_m(names[i], SAMBA_XATTR_DOSSTREAM_PREFIX,
 758                                   strlen(SAMBA_XATTR_DOSSTREAM_PREFIX)) != 0) {
 759                         if (samba_private_attr_name(names[i])) {
 760                                 continue;
 761                         }
 762                 }
 763
 764                 if (strncmp(names[i], config->prefix,
 765                             config->prefix_len) != 0) {
 766                         continue;
 767                 }
 768
 769                 status = get_ea_value(names,
 770                                         handle->conn,
 771                                         NULL,
 772                                         smb_fname,
 773                                         names[i],
 774                                         &ea);
 775                 if (!NT_STATUS_IS_OK(status)) {
 776                         DEBUG(10, ("Could not get ea %s for file %s: %s\n",
 777                                 names[i],
 778                                 smb_fname->base_name,
 779                                 nt_errstr(status)));
 780                         continue;
 781                 }
 782
 783                 ea.name = talloc_asprintf(
 784                         ea.value.data, ":%s%s",
 785                         names[i] + config->prefix_len,
 786                         config->store_stream_type ? "" : ":$DATA");
 787                 if (ea.name == NULL) {
 788                         DEBUG(0, ("talloc failed\n"));
 789                         continue;
 790                 }
 791
 792                 if (!fn(&ea, private_data)) {
 793                         TALLOC_FREE(ea.value.data);
 794                         return NT_STATUS_OK;
 795                 }
 796
 797                 TALLOC_FREE(ea.value.data);
 798         }
 799
 800         TALLOC_FREE(names);
 801         return NT_STATUS_OK;
 802 }
 803
 804 static bool add_one_stream(TALLOC_CTX *mem_ctx, unsigned int *num_streams,
 805                            struct stream_struct **streams,
 806                            const char *name, off_t size,
 807                            off_t alloc_size)
 808 {
 809         struct stream_struct *tmp;
 810
 811         tmp = talloc_realloc(mem_ctx, *streams, struct stream_struct,
 812                                    (*num_streams)+1);
 813         if (tmp == NULL) {
 814                 return false;
 815         }
 816
 817         tmp[*num_streams].name = talloc_strdup(tmp, name);
 818         if (tmp[*num_streams].name == NULL) {
 819                 return false;
 820         }
 821
 822         tmp[*num_streams].size = size;
 823         tmp[*num_streams].alloc_size = alloc_size;
 824
 825         *streams = tmp;
 826         *num_streams += 1;
 827         return true;
 828 }
 829
 830 struct streaminfo_state {
 831         TALLOC_CTX *mem_ctx;
 832         vfs_handle_struct *handle;
 833         unsigned int num_streams;
 834         struct stream_struct *streams;
 835         NTSTATUS status;
 836 };
 837
 838 static bool collect_one_stream(struct ea_struct *ea, void *private_data)
 839 {
 840         struct streaminfo_state *state =
 841                 (struct streaminfo_state *)private_data;
 842
 843         if (!add_one_stream(state->mem_ctx,
 844                             &state->num_streams, &state->streams,
 845                             ea->name, ea->value.length-1,
 846                             smb_roundup(state->handle->conn,
 847                                         ea->value.length-1))) {
 848                 state->status = NT_STATUS_NO_MEMORY;
 849                 return false;
 850         }
 851
 852         return true;
 853 }
 854
 855 static NTSTATUS streams_xattr_streaminfo(vfs_handle_struct *handle,
 856                                          struct files_struct *fsp,
 857                                          const struct smb_filename *smb_fname,
 858                                          TALLOC_CTX *mem_ctx,
 859                                          unsigned int *pnum_streams,
 860                                          struct stream_struct **pstreams)
 861 {
 862         SMB_STRUCT_STAT sbuf;
 863         int ret;
 864         NTSTATUS status;
 865         struct streaminfo_state state;
 866
 867         ret = vfs_stat_smb_basename(handle->conn, smb_fname, &sbuf);
 868         if (ret == -1) {
 869                 return map_nt_error_from_unix(errno);
 870         }
 871
 872         state.streams = *pstreams;
 873         state.num_streams = *pnum_streams;
 874         state.mem_ctx = mem_ctx;
 875         state.handle = handle;
 876         state.status = NT_STATUS_OK;
 877
 878         if (S_ISLNK(sbuf.st_ex_mode)) {
 879                 /*
 880                  * Currently we do't have SMB_VFS_LLISTXATTR
 881                  * inside the VFS which means there's no way
 882                  * to cope with a symlink when lp_posix_pathnames().
 883                  * returns true. For now ignore links.
 884                  * FIXME - by adding SMB_VFS_LLISTXATTR. JRA.
 885                  */
 886                 status = NT_STATUS_OK;
 887         } else {
 888                 status = walk_xattr_streams(handle, fsp, smb_fname,
 889                                     collect_one_stream, &state);
 890         }
 891
 892         if (!NT_STATUS_IS_OK(status)) {
 893                 TALLOC_FREE(state.streams);
 894                 return status;
 895         }
 896
 897         if (!NT_STATUS_IS_OK(state.status)) {
 898                 TALLOC_FREE(state.streams);
 899                 return state.status;
 900         }
 901
 902         *pnum_streams = state.num_streams;
 903         *pstreams = state.streams;
 904
 905         return SMB_VFS_NEXT_STREAMINFO(handle,
 906                         fsp,
 907                         smb_fname,
 908                         mem_ctx,
 909                         pnum_streams,
 910                         pstreams);
 911 }
 912
 913 static uint32_t streams_xattr_fs_capabilities(struct vfs_handle_struct *handle,
 914                         enum timestamp_set_resolution *p_ts_res)
 915 {
 916         return SMB_VFS_NEXT_FS_CAPABILITIES(handle, p_ts_res) | FILE_NAMED_STREAMS;
 917 }
 918
 919 static int streams_xattr_connect(vfs_handle_struct *handle,
 920                                  const char *service, const char *user)
 921 {
 922         struct streams_xattr_config *config;
 923         const char *default_prefix = SAMBA_XATTR_DOSSTREAM_PREFIX;
 924         const char *prefix;
 925         int rc;
 926
 927         rc = SMB_VFS_NEXT_CONNECT(handle, service, user);
 928         if (rc != 0) {
 929                 return rc;
 930         }
 931
 932         config = talloc_zero(handle->conn, struct streams_xattr_config);
 933         if (config == NULL) {
 934                 DEBUG(1, ("talloc_zero() failed\n"));
 935                 errno = ENOMEM;
 936                 return -1;
 937         }
 938
 939         prefix = lp_parm_const_string(SNUM(handle->conn),
 940                                       "streams_xattr", "prefix",
 941                                       default_prefix);
 942         config->prefix = talloc_strdup(config, prefix);
 943         if (config->prefix == NULL) {
 944                 DEBUG(1, ("talloc_strdup() failed\n"));
 945                 errno = ENOMEM;
 946                 return -1;
 947         }
 948         config->prefix_len = strlen(config->prefix);
 949         DEBUG(10, ("streams_xattr using stream prefix: %s\n", config->prefix));
 950
 951         config->store_stream_type = lp_parm_bool(SNUM(handle->conn),
 952                                                  "streams_xattr",
 953                                                  "store_stream_type",
 954                                                  true);
 955
 956         SMB_VFS_HANDLE_SET_DATA(handle, config,
 957                                 NULL, struct stream_xattr_config,
 958                                 return -1);
 959
 960         return 0;
 961 }
 962
 963 static ssize_t streams_xattr_pwrite(vfs_handle_struct *handle,
 964                                     files_struct *fsp, const void *data,
 965                                     size_t n, off_t offset)
 966 {
 967         struct stream_io *sio =
 968                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
 969         struct ea_struct ea;
 970         NTSTATUS status;
 971         struct smb_filename *smb_fname_base = NULL;
 972         int ret;
 973
 974         DEBUG(10, ("streams_xattr_pwrite called for %d bytes\n", (int)n));
 975
 976         if (sio == NULL) {
 977                 return SMB_VFS_NEXT_PWRITE(handle, fsp, data, n, offset);
 978         }
 979
 980         if (!streams_xattr_recheck(sio)) {
 981                 return -1;
 982         }
 983
 984         /* Create an smb_filename with stream_name == NULL. */
 985         smb_fname_base = synthetic_smb_fname(talloc_tos(),
 986                                         sio->base,
 987                                         NULL,
 988                                         NULL,
 989                                         fsp->fsp_name->flags);
 990         if (smb_fname_base == NULL) {
 991                 errno = ENOMEM;
 992                 return -1;
 993         }
 994
 995         status = get_ea_value(talloc_tos(), handle->conn, NULL,
 996                               smb_fname_base, sio->xattr_name, &ea);
 997         if (!NT_STATUS_IS_OK(status)) {
 998                 return -1;
 999         }
1000
1001         if ((offset + n) > ea.value.length-1) {
1002                 uint8_t *tmp;
1003
1004                 tmp = talloc_realloc(talloc_tos(), ea.value.data, uint8_t,
1005                                            offset + n + 1);
1006
1007                 if (tmp == NULL) {
1008                         TALLOC_FREE(ea.value.data);
1009                         errno = ENOMEM;
1010                         return -1;
1011                 }
1012                 ea.value.data = tmp;
1013                 ea.value.length = offset + n + 1;
1014                 ea.value.data[offset+n] = 0;
1015         }
1016
1017         memcpy(ea.value.data + offset, data, n);
1018
1019         ret = SMB_VFS_SETXATTR(fsp->conn,
1020                                fsp->fsp_name,
1021                                sio->xattr_name,
1022                                ea.value.data, ea.value.length, 0);
1023         TALLOC_FREE(ea.value.data);
1024
1025         if (ret == -1) {
1026                 return -1;
1027         }
1028
1029         return n;
1030 }
1031
1032 static ssize_t streams_xattr_pread(vfs_handle_struct *handle,
1033                                    files_struct *fsp, void *data,
1034                                    size_t n, off_t offset)
1035 {
1036         struct stream_io *sio =
1037                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1038         struct ea_struct ea;
1039         NTSTATUS status;
1040         size_t length, overlap;
1041         struct smb_filename *smb_fname_base = NULL;
1042
1043         DEBUG(10, ("streams_xattr_pread: offset=%d, size=%d\n",
1044                    (int)offset, (int)n));
1045
1046         if (sio == NULL) {
1047                 return SMB_VFS_NEXT_PREAD(handle, fsp, data, n, offset);
1048         }
1049
1050         if (!streams_xattr_recheck(sio)) {
1051                 return -1;
1052         }
1053
1054         /* Create an smb_filename with stream_name == NULL. */
1055         smb_fname_base = synthetic_smb_fname(talloc_tos(),
1056                                         sio->base,
1057                                         NULL,
1058                                         NULL,
1059                                         fsp->fsp_name->flags);
1060         if (smb_fname_base == NULL) {
1061                 errno = ENOMEM;
1062                 return -1;
1063         }
1064
1065         status = get_ea_value(talloc_tos(), handle->conn, NULL,
1066                               smb_fname_base, sio->xattr_name, &ea);
1067         if (!NT_STATUS_IS_OK(status)) {
1068                 return -1;
1069         }
1070
1071         length = ea.value.length-1;
1072
1073         DEBUG(10, ("streams_xattr_pread: get_ea_value returned %d bytes\n",
1074                    (int)length));
1075
1076         /* Attempt to read past EOF. */
1077         if (length <= offset) {
1078                 return 0;
1079         }
1080
1081         overlap = (offset + n) > length ? (length - offset) : n;
1082         memcpy(data, ea.value.data + offset, overlap);
1083
1084         TALLOC_FREE(ea.value.data);
1085         return overlap;
1086 }
1087
1088 struct streams_xattr_pread_state {
1089         ssize_t nread;
1090         struct vfs_aio_state vfs_aio_state;
1091 };
1092
1093 static void streams_xattr_pread_done(struct tevent_req *subreq);
1094
1095 static struct tevent_req *streams_xattr_pread_send(
1096         struct vfs_handle_struct *handle,
1097         TALLOC_CTX *mem_ctx,
1098         struct tevent_context *ev,
1099         struct files_struct *fsp,
1100         void *data,
1101         size_t n, off_t offset)
1102 {
1103         struct tevent_req *req = NULL;
1104         struct tevent_req *subreq = NULL;
1105         struct streams_xattr_pread_state *state = NULL;
1106         struct stream_io *sio =
1107                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1108
1109         req = tevent_req_create(mem_ctx, &state,
1110                                 struct streams_xattr_pread_state);
1111         if (req == NULL) {
1112                 return NULL;
1113         }
1114
1115         if (sio == NULL) {
1116                 subreq = SMB_VFS_NEXT_PREAD_SEND(state, ev, handle, fsp,
1117                                                  data, n, offset);
1118                 if (tevent_req_nomem(req, subreq)) {
1119                         return tevent_req_post(req, ev);
1120                 }
1121                 tevent_req_set_callback(subreq, streams_xattr_pread_done, req);
1122                 return req;
1123         }
1124
1125         state->nread = SMB_VFS_PREAD(fsp, data, n, offset);
1126         if (state->nread != n) {
1127                 if (state->nread != -1) {
1128                         errno = EIO;
1129                 }
1130                 tevent_req_error(req, errno);
1131                 return tevent_req_post(req, ev);
1132         }
1133
1134         tevent_req_done(req);
1135         return tevent_req_post(req, ev);
1136 }
1137
1138 static void streams_xattr_pread_done(struct tevent_req *subreq)
1139 {
1140         struct tevent_req *req = tevent_req_callback_data(
1141                 subreq, struct tevent_req);
1142         struct streams_xattr_pread_state *state = tevent_req_data(
1143                 req, struct streams_xattr_pread_state);
1144
1145         state->nread = SMB_VFS_PREAD_RECV(subreq, &state->vfs_aio_state);
1146         TALLOC_FREE(subreq);
1147
1148         if (tevent_req_error(req, state->vfs_aio_state.error)) {
1149                 return;
1150         }
1151         tevent_req_done(req);
1152 }
1153
1154 static ssize_t streams_xattr_pread_recv(struct tevent_req *req,
1155                                         struct vfs_aio_state *vfs_aio_state)
1156 {
1157         struct streams_xattr_pread_state *state = tevent_req_data(
1158                 req, struct streams_xattr_pread_state);
1159
1160         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
1161                 return -1;
1162         }
1163
1164         *vfs_aio_state = state->vfs_aio_state;
1165         return state->nread;
1166 }
1167
1168 struct streams_xattr_pwrite_state {
1169         ssize_t nwritten;
1170         struct vfs_aio_state vfs_aio_state;
1171 };
1172
1173 static void streams_xattr_pwrite_done(struct tevent_req *subreq);
1174
1175 static struct tevent_req *streams_xattr_pwrite_send(
1176         struct vfs_handle_struct *handle,
1177         TALLOC_CTX *mem_ctx,
1178         struct tevent_context *ev,
1179         struct files_struct *fsp,
1180         const void *data,
1181         size_t n, off_t offset)
1182 {
1183         struct tevent_req *req = NULL;
1184         struct tevent_req *subreq = NULL;
1185         struct streams_xattr_pwrite_state *state = NULL;
1186         struct stream_io *sio =
1187                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1188
1189         req = tevent_req_create(mem_ctx, &state,
1190                                 struct streams_xattr_pwrite_state);
1191         if (req == NULL) {
1192                 return NULL;
1193         }
1194
1195         if (sio == NULL) {
1196                 subreq = SMB_VFS_NEXT_PWRITE_SEND(state, ev, handle, fsp,
1197                                                   data, n, offset);
1198                 if (tevent_req_nomem(req, subreq)) {
1199                         return tevent_req_post(req, ev);
1200                 }
1201                 tevent_req_set_callback(subreq, streams_xattr_pwrite_done, req);
1202                 return req;
1203         }
1204
1205         state->nwritten = SMB_VFS_PWRITE(fsp, data, n, offset);
1206         if (state->nwritten != n) {
1207                 if (state->nwritten != -1) {
1208                         errno = EIO;
1209                 }
1210                 tevent_req_error(req, errno);
1211                 return tevent_req_post(req, ev);
1212         }
1213
1214         tevent_req_done(req);
1215         return tevent_req_post(req, ev);
1216 }
1217
1218 static void streams_xattr_pwrite_done(struct tevent_req *subreq)
1219 {
1220         struct tevent_req *req = tevent_req_callback_data(
1221                 subreq, struct tevent_req);
1222         struct streams_xattr_pwrite_state *state = tevent_req_data(
1223                 req, struct streams_xattr_pwrite_state);
1224
1225         state->nwritten = SMB_VFS_PWRITE_RECV(subreq, &state->vfs_aio_state);
1226         TALLOC_FREE(subreq);
1227
1228         if (tevent_req_error(req, state->vfs_aio_state.error)) {
1229                 return;
1230         }
1231         tevent_req_done(req);
1232 }
1233
1234 static ssize_t streams_xattr_pwrite_recv(struct tevent_req *req,
1235                                          struct vfs_aio_state *vfs_aio_state)
1236 {
1237         struct streams_xattr_pwrite_state *state = tevent_req_data(
1238                 req, struct streams_xattr_pwrite_state);
1239
1240         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
1241                 return -1;
1242         }
1243
1244         *vfs_aio_state = state->vfs_aio_state;
1245         return state->nwritten;
1246 }
1247
1248 static int streams_xattr_ftruncate(struct vfs_handle_struct *handle,
1249                                         struct files_struct *fsp,
1250                                         off_t offset)
1251 {
1252         int ret;
1253         uint8_t *tmp;
1254         struct ea_struct ea;
1255         NTSTATUS status;
1256         struct stream_io *sio =
1257                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1258         struct smb_filename *smb_fname_base = NULL;
1259
1260         DEBUG(10, ("streams_xattr_ftruncate called for file %s offset %.0f\n",
1261                    fsp_str_dbg(fsp), (double)offset));
1262
1263         if (sio == NULL) {
1264                 return SMB_VFS_NEXT_FTRUNCATE(handle, fsp, offset);
1265         }
1266
1267         if (!streams_xattr_recheck(sio)) {
1268                 return -1;
1269         }
1270
1271         /* Create an smb_filename with stream_name == NULL. */
1272         smb_fname_base = synthetic_smb_fname(talloc_tos(),
1273                                         sio->base,
1274                                         NULL,
1275                                         NULL,
1276                                         fsp->fsp_name->flags);
1277         if (smb_fname_base == NULL) {
1278                 errno = ENOMEM;
1279                 return -1;
1280         }
1281
1282         status = get_ea_value(talloc_tos(), handle->conn, NULL,
1283                               smb_fname_base, sio->xattr_name, &ea);
1284         if (!NT_STATUS_IS_OK(status)) {
1285                 return -1;
1286         }
1287
1288         tmp = talloc_realloc(talloc_tos(), ea.value.data, uint8_t,
1289                                    offset + 1);
1290
1291         if (tmp == NULL) {
1292                 TALLOC_FREE(ea.value.data);
1293                 errno = ENOMEM;
1294                 return -1;
1295         }
1296
1297         /* Did we expand ? */
1298         if (ea.value.length < offset + 1) {
1299                 memset(&tmp[ea.value.length], '\0',
1300                         offset + 1 - ea.value.length);
1301         }
1302
1303         ea.value.data = tmp;
1304         ea.value.length = offset + 1;
1305         ea.value.data[offset] = 0;
1306
1307         ret = SMB_VFS_SETXATTR(fsp->conn,
1308                                fsp->fsp_name,
1309                                sio->xattr_name,
1310                                ea.value.data, ea.value.length, 0);
1311         TALLOC_FREE(ea.value.data);
1312
1313         if (ret == -1) {
1314                 return -1;
1315         }
1316
1317         return 0;
1318 }
1319
1320 static int streams_xattr_fallocate(struct vfs_handle_struct *handle,
1321                                         struct files_struct *fsp,
1322                                         uint32_t mode,
1323                                         off_t offset,
1324                                         off_t len)
1325 {
1326         struct stream_io *sio =
1327                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1328
1329         DEBUG(10, ("streams_xattr_fallocate called for file %s offset %.0f"
1330                 "len = %.0f\n",
1331                 fsp_str_dbg(fsp), (double)offset, (double)len));
1332
1333         if (sio == NULL) {
1334                 return SMB_VFS_NEXT_FALLOCATE(handle, fsp, mode, offset, len);
1335         }
1336
1337         if (!streams_xattr_recheck(sio)) {
1338                 return -1;
1339         }
1340
1341         /* Let the pwrite code path handle it. */
1342         errno = ENOSYS;
1343         return -1;
1344 }
1345
1346 static int streams_xattr_fchown(vfs_handle_struct *handle, files_struct *fsp,
1347                                 uid_t uid, gid_t gid)
1348 {
1349         struct stream_io *sio =
1350                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1351
1352         if (sio == NULL) {
1353                 return SMB_VFS_NEXT_FCHOWN(handle, fsp, uid, gid);
1354         }
1355
1356         return 0;
1357 }
1358
1359 static int streams_xattr_fchmod(vfs_handle_struct *handle,
1360                                 files_struct *fsp,
1361                                 mode_t mode)
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_FCHMOD(handle, fsp, mode);
1368         }
1369
1370         return 0;
1371 }
1372
1373 static ssize_t streams_xattr_fgetxattr(struct vfs_handle_struct *handle,
1374                                        struct files_struct *fsp,
1375                                        const char *name,
1376                                        void *value,
1377                                        size_t size)
1378 {
1379         struct stream_io *sio =
1380                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1381
1382         if (sio == NULL) {
1383                 return SMB_VFS_NEXT_FGETXATTR(handle, fsp, name, value, size);
1384         }
1385
1386         errno = ENOTSUP;
1387         return -1;
1388 }
1389
1390 static ssize_t streams_xattr_flistxattr(struct vfs_handle_struct *handle,
1391                                         struct files_struct *fsp,
1392                                         char *list,
1393                                         size_t size)
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_FLISTXATTR(handle, fsp, list, size);
1400         }
1401
1402         errno = ENOTSUP;
1403         return -1;
1404 }
1405
1406 static int streams_xattr_fremovexattr(struct vfs_handle_struct *handle,
1407                                       struct files_struct *fsp,
1408                                       const char *name)
1409 {
1410         struct stream_io *sio =
1411                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1412
1413         if (sio == NULL) {
1414                 return SMB_VFS_NEXT_FREMOVEXATTR(handle, fsp, name);
1415         }
1416
1417         errno = ENOTSUP;
1418         return -1;
1419 }
1420
1421 static int streams_xattr_fsetxattr(struct vfs_handle_struct *handle,
1422                                    struct files_struct *fsp,
1423                                    const char *name,
1424                                    const void *value,
1425                                    size_t size,
1426                                    int flags)
1427 {
1428         struct stream_io *sio =
1429                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1430
1431         if (sio == NULL) {
1432                 return SMB_VFS_NEXT_FSETXATTR(handle, fsp, name, value,
1433                                               size, flags);
1434         }
1435
1436         errno = ENOTSUP;
1437         return -1;
1438 }
1439
1440 static SMB_ACL_T streams_xattr_sys_acl_get_fd(vfs_handle_struct *handle,
1441                                               files_struct *fsp,
1442                                               TALLOC_CTX *mem_ctx)
1443 {
1444         struct stream_io *sio =
1445                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1446
1447         if (sio == NULL) {
1448                 return SMB_VFS_NEXT_SYS_ACL_GET_FD(handle, fsp, mem_ctx);
1449         }
1450
1451         return SMB_VFS_NEXT_SYS_ACL_GET_FILE(
1452                 handle, fsp->base_fsp->fsp_name,
1453                 SMB_ACL_TYPE_ACCESS, mem_ctx);
1454 }
1455
1456 static int streams_xattr_sys_acl_set_fd(vfs_handle_struct *handle,
1457                                         files_struct *fsp,
1458                                         SMB_ACL_T theacl)
1459 {
1460         struct stream_io *sio =
1461                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1462
1463         if (sio == NULL) {
1464                 return SMB_VFS_NEXT_SYS_ACL_SET_FD(handle, fsp, theacl);
1465         }
1466
1467         return 0;
1468 }
1469
1470 static int streams_xattr_sys_acl_blob_get_fd(vfs_handle_struct *handle,
1471                                              files_struct *fsp,
1472                                              TALLOC_CTX *mem_ctx,
1473                                              char **blob_description,
1474                                              DATA_BLOB *blob)
1475 {
1476         struct stream_io *sio =
1477                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1478
1479         if (sio == NULL) {
1480                 return SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FD(handle, fsp, mem_ctx,
1481                                                         blob_description, blob);
1482         }
1483
1484         return SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FILE(
1485                 handle, fsp->base_fsp->fsp_name, mem_ctx,
1486                 blob_description, blob);
1487 }
1488
1489 static NTSTATUS streams_xattr_fget_nt_acl(vfs_handle_struct *handle,
1490                                           files_struct *fsp,
1491                                           uint32_t security_info,
1492                                           TALLOC_CTX *mem_ctx,
1493                                           struct security_descriptor **ppdesc)
1494 {
1495         struct stream_io *sio =
1496                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1497
1498         if (sio == NULL) {
1499                 return SMB_VFS_NEXT_FGET_NT_ACL(handle, fsp, security_info,
1500                                                 mem_ctx, ppdesc);
1501         }
1502
1503         return SMB_VFS_NEXT_GET_NT_ACL(handle, fsp->base_fsp->fsp_name,
1504                                        security_info, mem_ctx, ppdesc);
1505 }
1506
1507 static NTSTATUS streams_xattr_fset_nt_acl(vfs_handle_struct *handle,
1508                                           files_struct *fsp,
1509                                           uint32_t security_info_sent,
1510                                           const struct security_descriptor *psd)
1511 {
1512         struct stream_io *sio =
1513                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1514
1515         if (sio == NULL) {
1516                 return SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp,
1517                                                 security_info_sent, psd);
1518         }
1519
1520         return NT_STATUS_OK;
1521 }
1522
1523 struct streams_xattr_fsync_state {
1524         int ret;
1525         struct vfs_aio_state vfs_aio_state;
1526 };
1527
1528 static void streams_xattr_fsync_done(struct tevent_req *subreq);
1529
1530 static struct tevent_req *streams_xattr_fsync_send(
1531         struct vfs_handle_struct *handle,
1532         TALLOC_CTX *mem_ctx,
1533         struct tevent_context *ev,
1534         struct files_struct *fsp)
1535 {
1536         struct tevent_req *req = NULL;
1537         struct tevent_req *subreq = NULL;
1538         struct streams_xattr_fsync_state *state = NULL;
1539         struct stream_io *sio =
1540                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1541
1542         req = tevent_req_create(mem_ctx, &state,
1543                                 struct streams_xattr_fsync_state);
1544         if (req == NULL) {
1545                 return NULL;
1546         }
1547
1548         if (sio == NULL) {
1549                 subreq = SMB_VFS_NEXT_FSYNC_SEND(state, ev, handle, fsp);
1550                 if (tevent_req_nomem(req, subreq)) {
1551                         return tevent_req_post(req, ev);
1552                 }
1553                 tevent_req_set_callback(subreq, streams_xattr_fsync_done, req);
1554                 return req;
1555         }
1556
1557         /*
1558          * There's no pathname based sync variant and we don't have access to
1559          * the basefile handle, so we can't do anything here.
1560          */
1561
1562         tevent_req_done(req);
1563         return tevent_req_post(req, ev);
1564 }
1565
1566 static void streams_xattr_fsync_done(struct tevent_req *subreq)
1567 {
1568         struct tevent_req *req = tevent_req_callback_data(
1569                 subreq, struct tevent_req);
1570         struct streams_xattr_fsync_state *state = tevent_req_data(
1571                 req, struct streams_xattr_fsync_state);
1572
1573         state->ret = SMB_VFS_FSYNC_RECV(subreq, &state->vfs_aio_state);
1574         TALLOC_FREE(subreq);
1575         if (state->ret != 0) {
1576                 tevent_req_error(req, errno);
1577                 return;
1578         }
1579
1580         tevent_req_done(req);
1581 }
1582
1583 static int streams_xattr_fsync_recv(struct tevent_req *req,
1584                                     struct vfs_aio_state *vfs_aio_state)
1585 {
1586         struct streams_xattr_fsync_state *state = tevent_req_data(
1587                 req, struct streams_xattr_fsync_state);
1588
1589         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
1590                 return -1;
1591         }
1592
1593         *vfs_aio_state = state->vfs_aio_state;
1594         return state->ret;
1595 }
1596
1597 static bool streams_xattr_lock(vfs_handle_struct *handle,
1598                                files_struct *fsp,
1599                                int op,
1600                                off_t offset,
1601                                off_t count,
1602                                int type)
1603 {
1604         struct stream_io *sio =
1605                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1606
1607         if (sio == NULL) {
1608                 return SMB_VFS_NEXT_LOCK(handle, fsp, op, offset, count, type);
1609         }
1610
1611         return true;
1612 }
1613
1614 static bool streams_xattr_getlock(vfs_handle_struct *handle,
1615                                   files_struct *fsp,
1616                                   off_t *poffset,
1617                                   off_t *pcount,
1618                                   int *ptype,
1619                                   pid_t *ppid)
1620 {
1621         struct stream_io *sio =
1622                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1623
1624         if (sio == NULL) {
1625                 return SMB_VFS_NEXT_GETLOCK(handle, fsp, poffset,
1626                                             pcount, ptype, ppid);
1627         }
1628
1629         errno = ENOTSUP;
1630         return false;
1631 }
1632
1633 static int streams_xattr_kernel_flock(vfs_handle_struct *handle,
1634                                       files_struct *fsp,
1635                                       uint32_t share_mode,
1636                                       uint32_t access_mask)
1637 {
1638         struct stream_io *sio =
1639                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1640
1641         if (sio == NULL) {
1642                 return SMB_VFS_NEXT_KERNEL_FLOCK(handle, fsp,
1643                                                  share_mode, access_mask);
1644         }
1645
1646         return 0;
1647 }
1648
1649 static int streams_xattr_linux_setlease(vfs_handle_struct *handle,
1650                                         files_struct *fsp,
1651                                         int leasetype)
1652 {
1653         struct stream_io *sio =
1654                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1655
1656         if (sio == NULL) {
1657                 return SMB_VFS_NEXT_LINUX_SETLEASE(handle, fsp, leasetype);
1658         }
1659
1660         return 0;
1661 }
1662
1663 static bool streams_xattr_strict_lock_check(struct vfs_handle_struct *handle,
1664                                             files_struct *fsp,
1665                                             struct lock_struct *plock)
1666 {
1667         struct stream_io *sio =
1668                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1669
1670         if (sio == NULL) {
1671                 return SMB_VFS_NEXT_STRICT_LOCK_CHECK(handle, fsp, plock);
1672         }
1673
1674         return true;
1675 }
1676
1677 static struct vfs_fn_pointers vfs_streams_xattr_fns = {
1678         .fs_capabilities_fn = streams_xattr_fs_capabilities,
1679         .connect_fn = streams_xattr_connect,
1680         .open_fn = streams_xattr_open,
1681         .close_fn = streams_xattr_close,
1682         .stat_fn = streams_xattr_stat,
1683         .fstat_fn = streams_xattr_fstat,
1684         .lstat_fn = streams_xattr_lstat,
1685         .pread_fn = streams_xattr_pread,
1686         .pwrite_fn = streams_xattr_pwrite,
1687         .pread_send_fn = streams_xattr_pread_send,
1688         .pread_recv_fn = streams_xattr_pread_recv,
1689         .pwrite_send_fn = streams_xattr_pwrite_send,
1690         .pwrite_recv_fn = streams_xattr_pwrite_recv,
1691         .unlink_fn = streams_xattr_unlink,
1692         .rename_fn = streams_xattr_rename,
1693         .ftruncate_fn = streams_xattr_ftruncate,
1694         .fallocate_fn = streams_xattr_fallocate,
1695         .streaminfo_fn = streams_xattr_streaminfo,
1696
1697         .fsync_send_fn = streams_xattr_fsync_send,
1698         .fsync_recv_fn = streams_xattr_fsync_recv,
1699
1700         .lock_fn = streams_xattr_lock,
1701         .getlock_fn = streams_xattr_getlock,
1702         .kernel_flock_fn = streams_xattr_kernel_flock,
1703         .linux_setlease_fn = streams_xattr_linux_setlease,
1704         .strict_lock_check_fn = streams_xattr_strict_lock_check,
1705
1706         .fchown_fn = streams_xattr_fchown,
1707         .fchmod_fn = streams_xattr_fchmod,
1708
1709         .fgetxattr_fn = streams_xattr_fgetxattr,
1710         .flistxattr_fn = streams_xattr_flistxattr,
1711         .fremovexattr_fn = streams_xattr_fremovexattr,
1712         .fsetxattr_fn = streams_xattr_fsetxattr,
1713
1714         .sys_acl_get_fd_fn = streams_xattr_sys_acl_get_fd,
1715         .sys_acl_blob_get_fd_fn = streams_xattr_sys_acl_blob_get_fd,
1716         .sys_acl_set_fd_fn = streams_xattr_sys_acl_set_fd,
1717
1718         .fget_nt_acl_fn = streams_xattr_fget_nt_acl,
1719         .fset_nt_acl_fn = streams_xattr_fset_nt_acl,
1720 };
1721
1722 static_decl_vfs;
1723 NTSTATUS vfs_streams_xattr_init(TALLOC_CTX *ctx)
1724 {
1725         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "streams_xattr",
1726                                 &vfs_streams_xattr_fns);
1727 }