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->twrp,
 223                                         fsp->fsp_name->flags);
 224         if (smb_fname_base == NULL) {
 225                 errno = ENOMEM;
 226                 return -1;
 227         }
 228
 229         ret = vfs_stat(handle->conn, smb_fname_base);
 230         *sbuf = smb_fname_base->st;
 231
 232         if (ret == -1) {
 233                 TALLOC_FREE(smb_fname_base);
 234                 return -1;
 235         }
 236
 237         sbuf->st_ex_size = get_xattr_size(handle->conn,
 238                                         smb_fname_base, io->xattr_name);
 239         if (sbuf->st_ex_size == -1) {
 240                 TALLOC_FREE(smb_fname_base);
 241                 SET_STAT_INVALID(*sbuf);
 242                 return -1;
 243         }
 244
 245         DEBUG(10, ("sbuf->st_ex_size = %d\n", (int)sbuf->st_ex_size));
 246
 247         sbuf->st_ex_ino = hash_inode(sbuf, io->xattr_name);
 248         sbuf->st_ex_mode &= ~S_IFMT;
 249         sbuf->st_ex_mode &= ~S_IFDIR;
 250         sbuf->st_ex_mode |= S_IFREG;
 251         sbuf->st_ex_blocks = sbuf->st_ex_size / STAT_ST_BLOCKSIZE + 1;
 252
 253         TALLOC_FREE(smb_fname_base);
 254         return 0;
 255 }
 256
 257 static int streams_xattr_stat(vfs_handle_struct *handle,
 258                               struct smb_filename *smb_fname)
 259 {
 260         NTSTATUS status;
 261         int result = -1;
 262         char *xattr_name = NULL;
 263
 264         if (!is_named_stream(smb_fname)) {
 265                 return SMB_VFS_NEXT_STAT(handle, smb_fname);
 266         }
 267
 268         /* Note if lp_posix_paths() is true, we can never
 269          * get here as is_named_stream() is
 270          * always false. So we never need worry about
 271          * not following links here. */
 272
 273         /* Populate the stat struct with info from the base file. */
 274         if (streams_xattr_stat_base(handle, smb_fname, true) == -1) {
 275                 return -1;
 276         }
 277
 278         /* Derive the xattr name to lookup. */
 279         status = streams_xattr_get_name(handle, talloc_tos(),
 280                                         smb_fname->stream_name, &xattr_name);
 281         if (!NT_STATUS_IS_OK(status)) {
 282                 errno = map_errno_from_nt_status(status);
 283                 return -1;
 284         }
 285
 286         /* Augment the base file's stat information before returning. */
 287         smb_fname->st.st_ex_size = get_xattr_size(handle->conn,
 288                                                   smb_fname,
 289                                                   xattr_name);
 290         if (smb_fname->st.st_ex_size == -1) {
 291                 SET_STAT_INVALID(smb_fname->st);
 292                 errno = ENOENT;
 293                 result = -1;
 294                 goto fail;
 295         }
 296
 297         smb_fname->st.st_ex_ino = hash_inode(&smb_fname->st, xattr_name);
 298         smb_fname->st.st_ex_mode &= ~S_IFMT;
 299         smb_fname->st.st_ex_mode &= ~S_IFDIR;
 300         smb_fname->st.st_ex_mode |= S_IFREG;
 301         smb_fname->st.st_ex_blocks =
 302             smb_fname->st.st_ex_size / STAT_ST_BLOCKSIZE + 1;
 303
 304         result = 0;
 305  fail:
 306         TALLOC_FREE(xattr_name);
 307         return result;
 308 }
 309
 310 static int streams_xattr_lstat(vfs_handle_struct *handle,
 311                                struct smb_filename *smb_fname)
 312 {
 313         NTSTATUS status;
 314         int result = -1;
 315         char *xattr_name = NULL;
 316
 317         if (!is_named_stream(smb_fname)) {
 318                 return SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 319         }
 320
 321         /* Populate the stat struct with info from the base file. */
 322         if (streams_xattr_stat_base(handle, smb_fname, false) == -1) {
 323                 return -1;
 324         }
 325
 326         /* Derive the xattr name to lookup. */
 327         status = streams_xattr_get_name(handle, talloc_tos(),
 328                                         smb_fname->stream_name, &xattr_name);
 329         if (!NT_STATUS_IS_OK(status)) {
 330                 errno = map_errno_from_nt_status(status);
 331                 return -1;
 332         }
 333
 334         /* Augment the base file's stat information before returning. */
 335         smb_fname->st.st_ex_size = get_xattr_size(handle->conn,
 336                                                   smb_fname,
 337                                                   xattr_name);
 338         if (smb_fname->st.st_ex_size == -1) {
 339                 SET_STAT_INVALID(smb_fname->st);
 340                 errno = ENOENT;
 341                 result = -1;
 342                 goto fail;
 343         }
 344
 345         smb_fname->st.st_ex_ino = hash_inode(&smb_fname->st, xattr_name);
 346         smb_fname->st.st_ex_mode &= ~S_IFMT;
 347         smb_fname->st.st_ex_mode |= S_IFREG;
 348         smb_fname->st.st_ex_blocks =
 349             smb_fname->st.st_ex_size / STAT_ST_BLOCKSIZE + 1;
 350
 351         result = 0;
 352
 353  fail:
 354         TALLOC_FREE(xattr_name);
 355         return result;
 356 }
 357
 358 static int streams_xattr_openat(struct vfs_handle_struct *handle,
 359                                 const struct files_struct *dirfsp,
 360                                 const struct smb_filename *smb_fname,
 361                                 files_struct *fsp,
 362                                 int flags,
 363                                 mode_t mode)
 364 {
 365         NTSTATUS status;
 366         struct streams_xattr_config *config = NULL;
 367         struct stream_io *sio = NULL;
 368         struct ea_struct ea;
 369         char *xattr_name = NULL;
 370         int fakefd = -1;
 371         bool set_empty_xattr = false;
 372         int ret;
 373
 374         SMB_VFS_HANDLE_GET_DATA(handle, config, struct streams_xattr_config,
 375                                 return -1);
 376
 377         DEBUG(10, ("streams_xattr_open called for %s with flags 0x%x\n",
 378                    smb_fname_str_dbg(smb_fname), flags));
 379
 380         if (!is_named_stream(smb_fname)) {
 381                 return SMB_VFS_NEXT_OPENAT(handle,
 382                                            dirfsp,
 383                                            smb_fname,
 384                                            fsp,
 385                                            flags,
 386                                            mode);
 387         }
 388
 389         /*
 390          * For now assert this, so the below SMB_VFS_SETXATTR() works.
 391          */
 392         SMB_ASSERT(fsp_get_pathref_fd(dirfsp) == AT_FDCWD);
 393
 394         status = streams_xattr_get_name(handle, talloc_tos(),
 395                                         smb_fname->stream_name, &xattr_name);
 396         if (!NT_STATUS_IS_OK(status)) {
 397                 errno = map_errno_from_nt_status(status);
 398                 goto fail;
 399         }
 400
 401         status = get_ea_value(talloc_tos(), handle->conn, NULL,
 402                               smb_fname, xattr_name, &ea);
 403
 404         DEBUG(10, ("get_ea_value returned %s\n", nt_errstr(status)));
 405
 406         if (!NT_STATUS_IS_OK(status)) {
 407                 if (!NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 408                         /*
 409                          * The base file is not there. This is an error even if
 410                          * we got O_CREAT, the higher levels should have created
 411                          * the base file for us.
 412                          */
 413                         DBG_DEBUG("streams_xattr_open: base file %s not around, "
 414                                   "returning ENOENT\n", smb_fname->base_name);
 415                         errno = ENOENT;
 416                         goto fail;
 417                 }
 418
 419                 if (!(flags & O_CREAT)) {
 420                         errno = ENOATTR;
 421                         goto fail;
 422                 }
 423
 424                 set_empty_xattr = true;
 425         }
 426
 427         if (flags & O_TRUNC) {
 428                 set_empty_xattr = true;
 429         }
 430
 431         if (set_empty_xattr) {
 432                 /*
 433                  * The attribute does not exist or needs to be truncated
 434                  */
 435
 436                 /*
 437                  * Darn, xattrs need at least 1 byte
 438                  */
 439                 char null = '\0';
 440
 441                 DEBUG(10, ("creating or truncating attribute %s on file %s\n",
 442                            xattr_name, smb_fname->base_name));
 443
 444                 ret = SMB_VFS_FSETXATTR(fsp->base_fsp ? fsp->base_fsp : fsp,
 445                                        xattr_name,
 446                                        &null, sizeof(null),
 447                                        flags & O_EXCL ? XATTR_CREATE : 0);
 448                 if (ret != 0) {
 449                         goto fail;
 450                 }
 451         }
 452
 453         fakefd = vfs_fake_fd();
 454
 455         sio = VFS_ADD_FSP_EXTENSION(handle, fsp, struct stream_io, NULL);
 456         if (sio == NULL) {
 457                 errno = ENOMEM;
 458                 goto fail;
 459         }
 460
 461         sio->xattr_name = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(handle, fsp),
 462                                         xattr_name);
 463         if (sio->xattr_name == NULL) {
 464                 errno = ENOMEM;
 465                 goto fail;
 466         }
 467
 468         /*
 469          * so->base needs to be a copy of fsp->fsp_name->base_name,
 470          * making it identical to streams_xattr_recheck(). If the
 471          * open is changing directories, fsp->fsp_name->base_name
 472          * will be the full path from the share root, whilst
 473          * smb_fname will be relative to the $cwd.
 474          */
 475         sio->base = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(handle, fsp),
 476                                   fsp->fsp_name->base_name);
 477         if (sio->base == NULL) {
 478                 errno = ENOMEM;
 479                 goto fail;
 480         }
 481
 482         sio->fsp_name_ptr = fsp->fsp_name;
 483         sio->handle = handle;
 484         sio->fsp = fsp;
 485
 486         return fakefd;
 487
 488  fail:
 489         if (fakefd >= 0) {
 490                 vfs_fake_fd_close(fakefd);
 491                 fakefd = -1;
 492         }
 493
 494         return -1;
 495 }
 496
 497 static int streams_xattr_close(vfs_handle_struct *handle,
 498                                files_struct *fsp)
 499 {
 500         int ret;
 501         int fd;
 502
 503         fd = fsp_get_pathref_fd(fsp);
 504
 505         DBG_DEBUG("streams_xattr_close called [%s] fd [%d]\n",
 506                         smb_fname_str_dbg(fsp->fsp_name), fd);
 507
 508         if (!is_named_stream(fsp->fsp_name)) {
 509                 return SMB_VFS_NEXT_CLOSE(handle, fsp);
 510         }
 511
 512         ret = vfs_fake_fd_close(fd);
 513         fsp_set_fd(fsp, -1);
 514
 515         return ret;
 516 }
 517
 518 static int streams_xattr_unlink_internal(vfs_handle_struct *handle,
 519                         struct files_struct *dirfsp,
 520                         const struct smb_filename *smb_fname,
 521                         int flags)
 522 {
 523         NTSTATUS status;
 524         int ret = -1;
 525         char *xattr_name = NULL;
 526
 527         if (!is_named_stream(smb_fname)) {
 528                 return SMB_VFS_NEXT_UNLINKAT(handle,
 529                                         dirfsp,
 530                                         smb_fname,
 531                                         flags);
 532         }
 533
 534         status = streams_xattr_get_name(handle, talloc_tos(),
 535                                         smb_fname->stream_name, &xattr_name);
 536         if (!NT_STATUS_IS_OK(status)) {
 537                 errno = map_errno_from_nt_status(status);
 538                 goto fail;
 539         }
 540
 541         SMB_ASSERT(smb_fname->fsp != NULL);
 542         SMB_ASSERT(smb_fname->fsp->base_fsp != NULL);
 543
 544         ret = SMB_VFS_FREMOVEXATTR(smb_fname->fsp->base_fsp, xattr_name);
 545
 546         if ((ret == -1) && (errno == ENOATTR)) {
 547                 errno = ENOENT;
 548                 goto fail;
 549         }
 550
 551         ret = 0;
 552
 553  fail:
 554         TALLOC_FREE(xattr_name);
 555         return ret;
 556 }
 557
 558 static int streams_xattr_unlinkat(vfs_handle_struct *handle,
 559                         struct files_struct *dirfsp,
 560                         const struct smb_filename *smb_fname,
 561                         int flags)
 562 {
 563         int ret;
 564         if (flags & AT_REMOVEDIR) {
 565                 ret = SMB_VFS_NEXT_UNLINKAT(handle,
 566                                 dirfsp,
 567                                 smb_fname,
 568                                 flags);
 569         } else {
 570                 ret = streams_xattr_unlink_internal(handle,
 571                                 dirfsp,
 572                                 smb_fname,
 573                                 flags);
 574         }
 575         return ret;
 576 }
 577
 578 static int streams_xattr_renameat(vfs_handle_struct *handle,
 579                                 files_struct *srcfsp,
 580                                 const struct smb_filename *smb_fname_src,
 581                                 files_struct *dstfsp,
 582                                 const struct smb_filename *smb_fname_dst)
 583 {
 584         NTSTATUS status;
 585         int ret = -1;
 586         char *src_xattr_name = NULL;
 587         char *dst_xattr_name = NULL;
 588         bool src_is_stream, dst_is_stream;
 589         ssize_t oret;
 590         ssize_t nret;
 591         struct ea_struct ea;
 592         struct smb_filename *pathref_src = NULL;
 593         struct smb_filename *pathref_dst = NULL;
 594         struct smb_filename *full_src = NULL;
 595         struct smb_filename *full_dst = NULL;
 596
 597         src_is_stream = is_ntfs_stream_smb_fname(smb_fname_src);
 598         dst_is_stream = is_ntfs_stream_smb_fname(smb_fname_dst);
 599
 600         if (!src_is_stream && !dst_is_stream) {
 601                 return SMB_VFS_NEXT_RENAMEAT(handle,
 602                                         srcfsp,
 603                                         smb_fname_src,
 604                                         dstfsp,
 605                                         smb_fname_dst);
 606         }
 607
 608         /* For now don't allow renames from or to the default stream. */
 609         if (is_ntfs_default_stream_smb_fname(smb_fname_src) ||
 610             is_ntfs_default_stream_smb_fname(smb_fname_dst)) {
 611                 errno = ENOSYS;
 612                 goto done;
 613         }
 614
 615         /* Don't rename if the streams are identical. */
 616         if (strcasecmp_m(smb_fname_src->stream_name,
 617                        smb_fname_dst->stream_name) == 0) {
 618                 goto done;
 619         }
 620
 621         /* Get the xattr names. */
 622         status = streams_xattr_get_name(handle, talloc_tos(),
 623                                         smb_fname_src->stream_name,
 624                                         &src_xattr_name);
 625         if (!NT_STATUS_IS_OK(status)) {
 626                 errno = map_errno_from_nt_status(status);
 627                 goto fail;
 628         }
 629         status = streams_xattr_get_name(handle, talloc_tos(),
 630                                         smb_fname_dst->stream_name,
 631                                         &dst_xattr_name);
 632         if (!NT_STATUS_IS_OK(status)) {
 633                 errno = map_errno_from_nt_status(status);
 634                 goto fail;
 635         }
 636
 637         full_src = full_path_from_dirfsp_atname(talloc_tos(),
 638                                                 srcfsp,
 639                                                 smb_fname_src);
 640         if (full_src == NULL) {
 641                 errno = ENOMEM;
 642                 goto fail;
 643         }
 644         full_dst = full_path_from_dirfsp_atname(talloc_tos(),
 645                                                 dstfsp,
 646                                                 smb_fname_dst);
 647         if (full_dst == NULL) {
 648                 errno = ENOMEM;
 649                 goto fail;
 650         }
 651
 652         /* Get a pathref for full_src (base file, no stream name). */
 653         status = synthetic_pathref(talloc_tos(),
 654                                 handle->conn->cwd_fsp,
 655                                 full_src->base_name,
 656                                 NULL,
 657                                 NULL,
 658                                 full_src->twrp,
 659                                 full_src->flags,
 660                                 &pathref_src);
 661         if (!NT_STATUS_IS_OK(status)) {
 662                 errno = ENOENT;
 663                 goto fail;
 664         }
 665
 666         /* Read the old stream from the base file fsp. */
 667         status = get_ea_value(talloc_tos(),
 668                               handle->conn,
 669                               pathref_src->fsp,
 670                               NULL,
 671                               src_xattr_name,
 672                               &ea);
 673         if (!NT_STATUS_IS_OK(status)) {
 674                 errno = map_errno_from_nt_status(status);
 675                 goto fail;
 676         }
 677
 678         /* Get a pathref for full_dst (base file, no stream name). */
 679         status = synthetic_pathref(talloc_tos(),
 680                                 handle->conn->cwd_fsp,
 681                                 full_dst->base_name,
 682                                 NULL,
 683                                 NULL,
 684                                 full_dst->twrp,
 685                                 full_dst->flags,
 686                                 &pathref_dst);
 687         if (!NT_STATUS_IS_OK(status)) {
 688                 errno = ENOENT;
 689                 goto fail;
 690         }
 691
 692         /* (Over)write the new stream on the base file fsp. */
 693         nret = SMB_VFS_FSETXATTR(
 694                         pathref_dst->fsp,
 695                         dst_xattr_name,
 696                         ea.value.data,
 697                         ea.value.length,
 698                         0);
 699         if (nret < 0) {
 700                 if (errno == ENOATTR) {
 701                         errno = ENOENT;
 702                 }
 703                 goto fail;
 704         }
 705
 706         /*
 707          * Remove the old stream from the base file fsp.
 708          */
 709         oret = SMB_VFS_FREMOVEXATTR(pathref_src->fsp,
 710                                     src_xattr_name);
 711         if (oret < 0) {
 712                 if (errno == ENOATTR) {
 713                         errno = ENOENT;
 714                 }
 715                 goto fail;
 716         }
 717
 718  done:
 719         errno = 0;
 720         ret = 0;
 721  fail:
 722         TALLOC_FREE(pathref_src);
 723         TALLOC_FREE(pathref_dst);
 724         TALLOC_FREE(full_src);
 725         TALLOC_FREE(full_dst);
 726         TALLOC_FREE(src_xattr_name);
 727         TALLOC_FREE(dst_xattr_name);
 728         return ret;
 729 }
 730
 731 static NTSTATUS walk_xattr_streams(vfs_handle_struct *handle,
 732                                 files_struct *fsp,
 733                                 const struct smb_filename *smb_fname,
 734                                 bool (*fn)(struct ea_struct *ea,
 735                                         void *private_data),
 736                                 void *private_data)
 737 {
 738         NTSTATUS status;
 739         char **names;
 740         size_t i, num_names;
 741         struct streams_xattr_config *config;
 742
 743         SMB_VFS_HANDLE_GET_DATA(handle, config, struct streams_xattr_config,
 744                                 return NT_STATUS_UNSUCCESSFUL);
 745
 746         status = get_ea_names_from_file(talloc_tos(),
 747                                 smb_fname->fsp,
 748                                 &names,
 749                                 &num_names);
 750         if (!NT_STATUS_IS_OK(status)) {
 751                 return status;
 752         }
 753
 754         for (i=0; i<num_names; i++) {
 755                 struct ea_struct ea;
 756
 757                 /*
 758                  * We want to check with samba_private_attr_name()
 759                  * whether the xattr name is a private one,
 760                  * unfortunately it flags xattrs that begin with the
 761                  * default streams prefix as private.
 762                  *
 763                  * By only calling samba_private_attr_name() in case
 764                  * the xattr does NOT begin with the default prefix,
 765                  * we know that if it returns 'true' it definitely one
 766                  * of our internal xattr like "user.DOSATTRIB".
 767                  */
 768                 if (strncasecmp_m(names[i], SAMBA_XATTR_DOSSTREAM_PREFIX,
 769                                   strlen(SAMBA_XATTR_DOSSTREAM_PREFIX)) != 0) {
 770                         if (samba_private_attr_name(names[i])) {
 771                                 continue;
 772                         }
 773                 }
 774
 775                 if (strncmp(names[i], config->prefix,
 776                             config->prefix_len) != 0) {
 777                         continue;
 778                 }
 779
 780                 status = get_ea_value(names,
 781                                         handle->conn,
 782                                         NULL,
 783                                         smb_fname,
 784                                         names[i],
 785                                         &ea);
 786                 if (!NT_STATUS_IS_OK(status)) {
 787                         DEBUG(10, ("Could not get ea %s for file %s: %s\n",
 788                                 names[i],
 789                                 smb_fname->base_name,
 790                                 nt_errstr(status)));
 791                         continue;
 792                 }
 793
 794                 ea.name = talloc_asprintf(
 795                         ea.value.data, ":%s%s",
 796                         names[i] + config->prefix_len,
 797                         config->store_stream_type ? "" : ":$DATA");
 798                 if (ea.name == NULL) {
 799                         DEBUG(0, ("talloc failed\n"));
 800                         continue;
 801                 }
 802
 803                 if (!fn(&ea, private_data)) {
 804                         TALLOC_FREE(ea.value.data);
 805                         return NT_STATUS_OK;
 806                 }
 807
 808                 TALLOC_FREE(ea.value.data);
 809         }
 810
 811         TALLOC_FREE(names);
 812         return NT_STATUS_OK;
 813 }
 814
 815 static bool add_one_stream(TALLOC_CTX *mem_ctx, unsigned int *num_streams,
 816                            struct stream_struct **streams,
 817                            const char *name, off_t size,
 818                            off_t alloc_size)
 819 {
 820         struct stream_struct *tmp;
 821
 822         tmp = talloc_realloc(mem_ctx, *streams, struct stream_struct,
 823                                    (*num_streams)+1);
 824         if (tmp == NULL) {
 825                 return false;
 826         }
 827
 828         tmp[*num_streams].name = talloc_strdup(tmp, name);
 829         if (tmp[*num_streams].name == NULL) {
 830                 return false;
 831         }
 832
 833         tmp[*num_streams].size = size;
 834         tmp[*num_streams].alloc_size = alloc_size;
 835
 836         *streams = tmp;
 837         *num_streams += 1;
 838         return true;
 839 }
 840
 841 struct streaminfo_state {
 842         TALLOC_CTX *mem_ctx;
 843         vfs_handle_struct *handle;
 844         unsigned int num_streams;
 845         struct stream_struct *streams;
 846         NTSTATUS status;
 847 };
 848
 849 static bool collect_one_stream(struct ea_struct *ea, void *private_data)
 850 {
 851         struct streaminfo_state *state =
 852                 (struct streaminfo_state *)private_data;
 853
 854         if (!add_one_stream(state->mem_ctx,
 855                             &state->num_streams, &state->streams,
 856                             ea->name, ea->value.length-1,
 857                             smb_roundup(state->handle->conn,
 858                                         ea->value.length-1))) {
 859                 state->status = NT_STATUS_NO_MEMORY;
 860                 return false;
 861         }
 862
 863         return true;
 864 }
 865
 866 static NTSTATUS streams_xattr_fstreaminfo(vfs_handle_struct *handle,
 867                                          struct files_struct *fsp,
 868                                          TALLOC_CTX *mem_ctx,
 869                                          unsigned int *pnum_streams,
 870                                          struct stream_struct **pstreams)
 871 {
 872         NTSTATUS status;
 873         struct streaminfo_state state;
 874
 875         state.streams = *pstreams;
 876         state.num_streams = *pnum_streams;
 877         state.mem_ctx = mem_ctx;
 878         state.handle = handle;
 879         state.status = NT_STATUS_OK;
 880
 881         status = walk_xattr_streams(handle,
 882                                     fsp,
 883                                     fsp->fsp_name,
 884                                     collect_one_stream,
 885                                     &state);
 886
 887         if (!NT_STATUS_IS_OK(status)) {
 888                 TALLOC_FREE(state.streams);
 889                 return status;
 890         }
 891
 892         if (!NT_STATUS_IS_OK(state.status)) {
 893                 TALLOC_FREE(state.streams);
 894                 return state.status;
 895         }
 896
 897         *pnum_streams = state.num_streams;
 898         *pstreams = state.streams;
 899
 900         return SMB_VFS_NEXT_FSTREAMINFO(handle,
 901                         fsp,
 902                         mem_ctx,
 903                         pnum_streams,
 904                         pstreams);
 905 }
 906
 907 static uint32_t streams_xattr_fs_capabilities(struct vfs_handle_struct *handle,
 908                         enum timestamp_set_resolution *p_ts_res)
 909 {
 910         return SMB_VFS_NEXT_FS_CAPABILITIES(handle, p_ts_res) | FILE_NAMED_STREAMS;
 911 }
 912
 913 static int streams_xattr_connect(vfs_handle_struct *handle,
 914                                  const char *service, const char *user)
 915 {
 916         struct streams_xattr_config *config;
 917         const char *default_prefix = SAMBA_XATTR_DOSSTREAM_PREFIX;
 918         const char *prefix;
 919         int rc;
 920
 921         rc = SMB_VFS_NEXT_CONNECT(handle, service, user);
 922         if (rc != 0) {
 923                 return rc;
 924         }
 925
 926         config = talloc_zero(handle->conn, struct streams_xattr_config);
 927         if (config == NULL) {
 928                 DEBUG(1, ("talloc_zero() failed\n"));
 929                 errno = ENOMEM;
 930                 return -1;
 931         }
 932
 933         prefix = lp_parm_const_string(SNUM(handle->conn),
 934                                       "streams_xattr", "prefix",
 935                                       default_prefix);
 936         config->prefix = talloc_strdup(config, prefix);
 937         if (config->prefix == NULL) {
 938                 DEBUG(1, ("talloc_strdup() failed\n"));
 939                 errno = ENOMEM;
 940                 return -1;
 941         }
 942         config->prefix_len = strlen(config->prefix);
 943         DEBUG(10, ("streams_xattr using stream prefix: %s\n", config->prefix));
 944
 945         config->store_stream_type = lp_parm_bool(SNUM(handle->conn),
 946                                                  "streams_xattr",
 947                                                  "store_stream_type",
 948                                                  true);
 949
 950         SMB_VFS_HANDLE_SET_DATA(handle, config,
 951                                 NULL, struct stream_xattr_config,
 952                                 return -1);
 953
 954         return 0;
 955 }
 956
 957 static ssize_t streams_xattr_pwrite(vfs_handle_struct *handle,
 958                                     files_struct *fsp, const void *data,
 959                                     size_t n, off_t offset)
 960 {
 961         struct stream_io *sio =
 962                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
 963         struct ea_struct ea;
 964         NTSTATUS status;
 965         int ret;
 966
 967         DEBUG(10, ("streams_xattr_pwrite called for %d bytes\n", (int)n));
 968
 969         if (sio == NULL) {
 970                 return SMB_VFS_NEXT_PWRITE(handle, fsp, data, n, offset);
 971         }
 972
 973         if (!streams_xattr_recheck(sio)) {
 974                 return -1;
 975         }
 976
 977         if ((offset + n) >= lp_smbd_max_xattr_size(SNUM(handle->conn))) {
 978                 /*
 979                  * Requested write is beyond what can be read based on
 980                  * samba configuration.
 981                  * ReFS returns STATUS_FILESYSTEM_LIMITATION, which causes
 982                  * entire file to be skipped by File Explorer. VFAT returns
 983                  * NT_STATUS_OBJECT_NAME_COLLISION causes user to be prompted
 984                  * to skip writing metadata, but copy data.
 985                  */
 986                 DBG_ERR("Write to xattr [%s] on file [%s] exceeds maximum "
 987                         "supported extended attribute size. "
 988                         "Depending on filesystem type and operating system "
 989                         "(OS) specifics, this value may be increased using "
 990                         "the value of the parameter: "
 991                         "smbd max xattr size = <bytes>. Consult OS and "
 992                         "filesystem manpages prior to increasing this limit.\n",
 993                         sio->xattr_name, sio->base);
 994                 errno = EOVERFLOW;
 995                 return -1;
 996         }
 997
 998         status = get_ea_value(talloc_tos(),
 999                               handle->conn,
1000                               fsp->base_fsp,
1001                               NULL,
1002                               sio->xattr_name,
1003                               &ea);
1004         if (!NT_STATUS_IS_OK(status)) {
1005                 return -1;
1006         }
1007
1008         if ((offset + n) > ea.value.length-1) {
1009                 uint8_t *tmp;
1010
1011                 tmp = talloc_realloc(talloc_tos(), ea.value.data, uint8_t,
1012                                            offset + n + 1);
1013
1014                 if (tmp == NULL) {
1015                         TALLOC_FREE(ea.value.data);
1016                         errno = ENOMEM;
1017                         return -1;
1018                 }
1019                 ea.value.data = tmp;
1020                 ea.value.length = offset + n + 1;
1021                 ea.value.data[offset+n] = 0;
1022         }
1023
1024         memcpy(ea.value.data + offset, data, n);
1025
1026         ret = SMB_VFS_FSETXATTR(fsp->base_fsp,
1027                                 sio->xattr_name,
1028                                 ea.value.data,
1029                                 ea.value.length,
1030                                 0);
1031         TALLOC_FREE(ea.value.data);
1032
1033         if (ret == -1) {
1034                 return -1;
1035         }
1036
1037         return n;
1038 }
1039
1040 static ssize_t streams_xattr_pread(vfs_handle_struct *handle,
1041                                    files_struct *fsp, void *data,
1042                                    size_t n, off_t offset)
1043 {
1044         struct stream_io *sio =
1045                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1046         struct ea_struct ea;
1047         NTSTATUS status;
1048         size_t length, overlap;
1049
1050         DEBUG(10, ("streams_xattr_pread: offset=%d, size=%d\n",
1051                    (int)offset, (int)n));
1052
1053         if (sio == NULL) {
1054                 return SMB_VFS_NEXT_PREAD(handle, fsp, data, n, offset);
1055         }
1056
1057         if (!streams_xattr_recheck(sio)) {
1058                 return -1;
1059         }
1060
1061         status = get_ea_value(talloc_tos(),
1062                               handle->conn,
1063                               fsp->base_fsp,
1064                               NULL,
1065                               sio->xattr_name,
1066                               &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->twrp,
1277                                         fsp->fsp_name->flags);
1278         if (smb_fname_base == NULL) {
1279                 errno = ENOMEM;
1280                 return -1;
1281         }
1282
1283         status = get_ea_value(talloc_tos(), handle->conn, NULL,
1284                               smb_fname_base, sio->xattr_name, &ea);
1285         if (!NT_STATUS_IS_OK(status)) {
1286                 return -1;
1287         }
1288
1289         tmp = talloc_realloc(talloc_tos(), ea.value.data, uint8_t,
1290                                    offset + 1);
1291
1292         if (tmp == NULL) {
1293                 TALLOC_FREE(ea.value.data);
1294                 errno = ENOMEM;
1295                 return -1;
1296         }
1297
1298         /* Did we expand ? */
1299         if (ea.value.length < offset + 1) {
1300                 memset(&tmp[ea.value.length], '\0',
1301                         offset + 1 - ea.value.length);
1302         }
1303
1304         ea.value.data = tmp;
1305         ea.value.length = offset + 1;
1306         ea.value.data[offset] = 0;
1307
1308         ret = SMB_VFS_FSETXATTR(fsp->base_fsp,
1309                                 sio->xattr_name,
1310                                 ea.value.data,
1311                                 ea.value.length,
1312                                 0);
1313
1314         TALLOC_FREE(ea.value.data);
1315
1316         if (ret == -1) {
1317                 return -1;
1318         }
1319
1320         return 0;
1321 }
1322
1323 static int streams_xattr_fallocate(struct vfs_handle_struct *handle,
1324                                         struct files_struct *fsp,
1325                                         uint32_t mode,
1326                                         off_t offset,
1327                                         off_t len)
1328 {
1329         struct stream_io *sio =
1330                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1331
1332         DEBUG(10, ("streams_xattr_fallocate called for file %s offset %.0f"
1333                 "len = %.0f\n",
1334                 fsp_str_dbg(fsp), (double)offset, (double)len));
1335
1336         if (sio == NULL) {
1337                 return SMB_VFS_NEXT_FALLOCATE(handle, fsp, mode, offset, len);
1338         }
1339
1340         if (!streams_xattr_recheck(sio)) {
1341                 return -1;
1342         }
1343
1344         /* Let the pwrite code path handle it. */
1345         errno = ENOSYS;
1346         return -1;
1347 }
1348
1349 static int streams_xattr_fchown(vfs_handle_struct *handle, files_struct *fsp,
1350                                 uid_t uid, gid_t gid)
1351 {
1352         struct stream_io *sio =
1353                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1354
1355         if (sio == NULL) {
1356                 return SMB_VFS_NEXT_FCHOWN(handle, fsp, uid, gid);
1357         }
1358
1359         return 0;
1360 }
1361
1362 static int streams_xattr_fchmod(vfs_handle_struct *handle,
1363                                 files_struct *fsp,
1364                                 mode_t mode)
1365 {
1366         struct stream_io *sio =
1367                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1368
1369         if (sio == NULL) {
1370                 return SMB_VFS_NEXT_FCHMOD(handle, fsp, mode);
1371         }
1372
1373         return 0;
1374 }
1375
1376 static ssize_t streams_xattr_fgetxattr(struct vfs_handle_struct *handle,
1377                                        struct files_struct *fsp,
1378                                        const char *name,
1379                                        void *value,
1380                                        size_t size)
1381 {
1382         struct stream_io *sio =
1383                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1384
1385         if (sio == NULL) {
1386                 return SMB_VFS_NEXT_FGETXATTR(handle, fsp, name, value, size);
1387         }
1388
1389         errno = ENOTSUP;
1390         return -1;
1391 }
1392
1393 static ssize_t streams_xattr_flistxattr(struct vfs_handle_struct *handle,
1394                                         struct files_struct *fsp,
1395                                         char *list,
1396                                         size_t size)
1397 {
1398         struct stream_io *sio =
1399                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1400
1401         if (sio == NULL) {
1402                 return SMB_VFS_NEXT_FLISTXATTR(handle, fsp, list, size);
1403         }
1404
1405         errno = ENOTSUP;
1406         return -1;
1407 }
1408
1409 static int streams_xattr_fremovexattr(struct vfs_handle_struct *handle,
1410                                       struct files_struct *fsp,
1411                                       const char *name)
1412 {
1413         struct stream_io *sio =
1414                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1415
1416         if (sio == NULL) {
1417                 return SMB_VFS_NEXT_FREMOVEXATTR(handle, fsp, name);
1418         }
1419
1420         errno = ENOTSUP;
1421         return -1;
1422 }
1423
1424 static int streams_xattr_fsetxattr(struct vfs_handle_struct *handle,
1425                                    struct files_struct *fsp,
1426                                    const char *name,
1427                                    const void *value,
1428                                    size_t size,
1429                                    int flags)
1430 {
1431         struct stream_io *sio =
1432                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1433
1434         if (sio == NULL) {
1435                 return SMB_VFS_NEXT_FSETXATTR(handle, fsp, name, value,
1436                                               size, flags);
1437         }
1438
1439         errno = ENOTSUP;
1440         return -1;
1441 }
1442
1443 struct streams_xattr_fsync_state {
1444         int ret;
1445         struct vfs_aio_state vfs_aio_state;
1446 };
1447
1448 static void streams_xattr_fsync_done(struct tevent_req *subreq);
1449
1450 static struct tevent_req *streams_xattr_fsync_send(
1451         struct vfs_handle_struct *handle,
1452         TALLOC_CTX *mem_ctx,
1453         struct tevent_context *ev,
1454         struct files_struct *fsp)
1455 {
1456         struct tevent_req *req = NULL;
1457         struct tevent_req *subreq = NULL;
1458         struct streams_xattr_fsync_state *state = NULL;
1459         struct stream_io *sio =
1460                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1461
1462         req = tevent_req_create(mem_ctx, &state,
1463                                 struct streams_xattr_fsync_state);
1464         if (req == NULL) {
1465                 return NULL;
1466         }
1467
1468         if (sio == NULL) {
1469                 subreq = SMB_VFS_NEXT_FSYNC_SEND(state, ev, handle, fsp);
1470                 if (tevent_req_nomem(req, subreq)) {
1471                         return tevent_req_post(req, ev);
1472                 }
1473                 tevent_req_set_callback(subreq, streams_xattr_fsync_done, req);
1474                 return req;
1475         }
1476
1477         /*
1478          * There's no pathname based sync variant and we don't have access to
1479          * the basefile handle, so we can't do anything here.
1480          */
1481
1482         tevent_req_done(req);
1483         return tevent_req_post(req, ev);
1484 }
1485
1486 static void streams_xattr_fsync_done(struct tevent_req *subreq)
1487 {
1488         struct tevent_req *req = tevent_req_callback_data(
1489                 subreq, struct tevent_req);
1490         struct streams_xattr_fsync_state *state = tevent_req_data(
1491                 req, struct streams_xattr_fsync_state);
1492
1493         state->ret = SMB_VFS_FSYNC_RECV(subreq, &state->vfs_aio_state);
1494         TALLOC_FREE(subreq);
1495         if (state->ret != 0) {
1496                 tevent_req_error(req, errno);
1497                 return;
1498         }
1499
1500         tevent_req_done(req);
1501 }
1502
1503 static int streams_xattr_fsync_recv(struct tevent_req *req,
1504                                     struct vfs_aio_state *vfs_aio_state)
1505 {
1506         struct streams_xattr_fsync_state *state = tevent_req_data(
1507                 req, struct streams_xattr_fsync_state);
1508
1509         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
1510                 return -1;
1511         }
1512
1513         *vfs_aio_state = state->vfs_aio_state;
1514         return state->ret;
1515 }
1516
1517 static bool streams_xattr_lock(vfs_handle_struct *handle,
1518                                files_struct *fsp,
1519                                int op,
1520                                off_t offset,
1521                                off_t count,
1522                                int type)
1523 {
1524         struct stream_io *sio =
1525                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1526
1527         if (sio == NULL) {
1528                 return SMB_VFS_NEXT_LOCK(handle, fsp, op, offset, count, type);
1529         }
1530
1531         return true;
1532 }
1533
1534 static bool streams_xattr_getlock(vfs_handle_struct *handle,
1535                                   files_struct *fsp,
1536                                   off_t *poffset,
1537                                   off_t *pcount,
1538                                   int *ptype,
1539                                   pid_t *ppid)
1540 {
1541         struct stream_io *sio =
1542                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1543
1544         if (sio == NULL) {
1545                 return SMB_VFS_NEXT_GETLOCK(handle, fsp, poffset,
1546                                             pcount, ptype, ppid);
1547         }
1548
1549         errno = ENOTSUP;
1550         return false;
1551 }
1552
1553 static int streams_xattr_kernel_flock(vfs_handle_struct *handle,
1554                                       files_struct *fsp,
1555                                       uint32_t share_access,
1556                                       uint32_t access_mask)
1557 {
1558         struct stream_io *sio =
1559                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1560
1561         if (sio == NULL) {
1562                 return SMB_VFS_NEXT_KERNEL_FLOCK(handle, fsp,
1563                                                  share_access, access_mask);
1564         }
1565
1566         return 0;
1567 }
1568
1569 static int streams_xattr_linux_setlease(vfs_handle_struct *handle,
1570                                         files_struct *fsp,
1571                                         int leasetype)
1572 {
1573         struct stream_io *sio =
1574                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1575
1576         if (sio == NULL) {
1577                 return SMB_VFS_NEXT_LINUX_SETLEASE(handle, fsp, leasetype);
1578         }
1579
1580         return 0;
1581 }
1582
1583 static bool streams_xattr_strict_lock_check(struct vfs_handle_struct *handle,
1584                                             files_struct *fsp,
1585                                             struct lock_struct *plock)
1586 {
1587         struct stream_io *sio =
1588                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1589
1590         if (sio == NULL) {
1591                 return SMB_VFS_NEXT_STRICT_LOCK_CHECK(handle, fsp, plock);
1592         }
1593
1594         return true;
1595 }
1596
1597 static struct vfs_fn_pointers vfs_streams_xattr_fns = {
1598         .fs_capabilities_fn = streams_xattr_fs_capabilities,
1599         .connect_fn = streams_xattr_connect,
1600         .openat_fn = streams_xattr_openat,
1601         .close_fn = streams_xattr_close,
1602         .stat_fn = streams_xattr_stat,
1603         .fstat_fn = streams_xattr_fstat,
1604         .lstat_fn = streams_xattr_lstat,
1605         .pread_fn = streams_xattr_pread,
1606         .pwrite_fn = streams_xattr_pwrite,
1607         .pread_send_fn = streams_xattr_pread_send,
1608         .pread_recv_fn = streams_xattr_pread_recv,
1609         .pwrite_send_fn = streams_xattr_pwrite_send,
1610         .pwrite_recv_fn = streams_xattr_pwrite_recv,
1611         .unlinkat_fn = streams_xattr_unlinkat,
1612         .renameat_fn = streams_xattr_renameat,
1613         .ftruncate_fn = streams_xattr_ftruncate,
1614         .fallocate_fn = streams_xattr_fallocate,
1615         .fstreaminfo_fn = streams_xattr_fstreaminfo,
1616
1617         .fsync_send_fn = streams_xattr_fsync_send,
1618         .fsync_recv_fn = streams_xattr_fsync_recv,
1619
1620         .lock_fn = streams_xattr_lock,
1621         .getlock_fn = streams_xattr_getlock,
1622         .kernel_flock_fn = streams_xattr_kernel_flock,
1623         .linux_setlease_fn = streams_xattr_linux_setlease,
1624         .strict_lock_check_fn = streams_xattr_strict_lock_check,
1625
1626         .fchown_fn = streams_xattr_fchown,
1627         .fchmod_fn = streams_xattr_fchmod,
1628
1629         .fgetxattr_fn = streams_xattr_fgetxattr,
1630         .flistxattr_fn = streams_xattr_flistxattr,
1631         .fremovexattr_fn = streams_xattr_fremovexattr,
1632         .fsetxattr_fn = streams_xattr_fsetxattr,
1633 };
1634
1635 static_decl_vfs;
1636 NTSTATUS vfs_streams_xattr_init(TALLOC_CTX *ctx)
1637 {
1638         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "streams_xattr",
1639                                 &vfs_streams_xattr_fns);
1640 }