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         int ret;
 416
 417         SMB_VFS_HANDLE_GET_DATA(handle, config, struct streams_xattr_config,
 418                                 return -1);
 419
 420         DEBUG(10, ("streams_xattr_open called for %s with flags 0x%x\n",
 421                    smb_fname_str_dbg(smb_fname), flags));
 422
 423         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 424                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 425         }
 426
 427         /* If the default stream is requested, just open the base file. */
 428         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 429                 char *tmp_stream_name;
 430
 431                 tmp_stream_name = smb_fname->stream_name;
 432                 smb_fname->stream_name = NULL;
 433
 434                 ret = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 435
 436                 smb_fname->stream_name = tmp_stream_name;
 437
 438                 return ret;
 439         }
 440
 441         status = streams_xattr_get_name(handle, talloc_tos(),
 442                                         smb_fname->stream_name, &xattr_name);
 443         if (!NT_STATUS_IS_OK(status)) {
 444                 errno = map_errno_from_nt_status(status);
 445                 goto fail;
 446         }
 447
 448         /*
 449          * Return a valid fd, but ensure any attempt to use it returns an error
 450          * (EPIPE).
 451          */
 452         ret = pipe(pipe_fds);
 453         if (ret != 0) {
 454                 goto fail;
 455         }
 456
 457         close(pipe_fds[1]);
 458         pipe_fds[1] = -1;
 459         fakefd = pipe_fds[0];
 460
 461         status = get_ea_value(talloc_tos(), handle->conn, NULL,
 462                               smb_fname, xattr_name, &ea);
 463
 464         DEBUG(10, ("get_ea_value returned %s\n", nt_errstr(status)));
 465
 466         if (!NT_STATUS_IS_OK(status)
 467             && !NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 468                 /*
 469                  * The base file is not there. This is an error even if we got
 470                  * O_CREAT, the higher levels should have created the base
 471                  * file for us.
 472                  */
 473                 DEBUG(10, ("streams_xattr_open: base file %s not around, "
 474                            "returning ENOENT\n", smb_fname->base_name));
 475                 errno = ENOENT;
 476                 goto fail;
 477         }
 478
 479         if ((!NT_STATUS_IS_OK(status) && (flags & O_CREAT)) ||
 480             (flags & O_TRUNC)) {
 481                 /*
 482                  * The attribute does not exist or needs to be truncated
 483                  */
 484
 485                 /*
 486                  * Darn, xattrs need at least 1 byte
 487                  */
 488                 char null = '\0';
 489
 490                 DEBUG(10, ("creating or truncating attribute %s on file %s\n",
 491                            xattr_name, smb_fname->base_name));
 492
 493                 ret = SMB_VFS_SETXATTR(fsp->conn,
 494                                        smb_fname,
 495                                        xattr_name,
 496                                        &null, sizeof(null),
 497                                        flags & O_EXCL ? XATTR_CREATE : 0);
 498                 if (ret != 0) {
 499                         goto fail;
 500                 }
 501         }
 502
 503         sio = VFS_ADD_FSP_EXTENSION(handle, fsp, struct stream_io, NULL);
 504         if (sio == NULL) {
 505                 errno = ENOMEM;
 506                 goto fail;
 507         }
 508
 509         sio->xattr_name = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(handle, fsp),
 510                                         xattr_name);
 511         if (sio->xattr_name == NULL) {
 512                 errno = ENOMEM;
 513                 goto fail;
 514         }
 515
 516         /*
 517          * so->base needs to be a copy of fsp->fsp_name->base_name,
 518          * making it identical to streams_xattr_recheck(). If the
 519          * open is changing directories, fsp->fsp_name->base_name
 520          * will be the full path from the share root, whilst
 521          * smb_fname will be relative to the $cwd.
 522          */
 523         sio->base = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(handle, fsp),
 524                                   fsp->fsp_name->base_name);
 525         if (sio->base == NULL) {
 526                 errno = ENOMEM;
 527                 goto fail;
 528         }
 529
 530         sio->fsp_name_ptr = fsp->fsp_name;
 531         sio->handle = handle;
 532         sio->fsp = fsp;
 533
 534         return fakefd;
 535
 536  fail:
 537         if (fakefd >= 0) {
 538                 close(fakefd);
 539                 fakefd = -1;
 540         }
 541
 542         return -1;
 543 }
 544
 545 static int streams_xattr_unlink(vfs_handle_struct *handle,
 546                                 const struct smb_filename *smb_fname)
 547 {
 548         NTSTATUS status;
 549         int ret = -1;
 550         char *xattr_name = NULL;
 551
 552         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 553                 return SMB_VFS_NEXT_UNLINK(handle, smb_fname);
 554         }
 555
 556         /* If the default stream is requested, just open the base file. */
 557         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 558                 struct smb_filename *smb_fname_base = NULL;
 559
 560                 smb_fname_base = cp_smb_filename(talloc_tos(), smb_fname);
 561                 if (smb_fname_base == NULL) {
 562                         errno = ENOMEM;
 563                         return -1;
 564                 }
 565
 566                 ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname_base);
 567
 568                 TALLOC_FREE(smb_fname_base);
 569                 return ret;
 570         }
 571
 572         status = streams_xattr_get_name(handle, talloc_tos(),
 573                                         smb_fname->stream_name, &xattr_name);
 574         if (!NT_STATUS_IS_OK(status)) {
 575                 errno = map_errno_from_nt_status(status);
 576                 goto fail;
 577         }
 578
 579         ret = SMB_VFS_REMOVEXATTR(handle->conn, smb_fname, xattr_name);
 580
 581         if ((ret == -1) && (errno == ENOATTR)) {
 582                 errno = ENOENT;
 583                 goto fail;
 584         }
 585
 586         ret = 0;
 587
 588  fail:
 589         TALLOC_FREE(xattr_name);
 590         return ret;
 591 }
 592
 593 static int streams_xattr_rename(vfs_handle_struct *handle,
 594                                 const struct smb_filename *smb_fname_src,
 595                                 const struct smb_filename *smb_fname_dst)
 596 {
 597         NTSTATUS status;
 598         int ret = -1;
 599         char *src_xattr_name = NULL;
 600         char *dst_xattr_name = NULL;
 601         bool src_is_stream, dst_is_stream;
 602         ssize_t oret;
 603         ssize_t nret;
 604         struct ea_struct ea;
 605
 606         src_is_stream = is_ntfs_stream_smb_fname(smb_fname_src);
 607         dst_is_stream = is_ntfs_stream_smb_fname(smb_fname_dst);
 608
 609         if (!src_is_stream && !dst_is_stream) {
 610                 return SMB_VFS_NEXT_RENAME(handle, smb_fname_src,
 611                                            smb_fname_dst);
 612         }
 613
 614         /* For now don't allow renames from or to the default stream. */
 615         if (is_ntfs_default_stream_smb_fname(smb_fname_src) ||
 616             is_ntfs_default_stream_smb_fname(smb_fname_dst)) {
 617                 errno = ENOSYS;
 618                 goto done;
 619         }
 620
 621         /* Don't rename if the streams are identical. */
 622         if (strcasecmp_m(smb_fname_src->stream_name,
 623                        smb_fname_dst->stream_name) == 0) {
 624                 goto done;
 625         }
 626
 627         /* Get the xattr names. */
 628         status = streams_xattr_get_name(handle, talloc_tos(),
 629                                         smb_fname_src->stream_name,
 630                                         &src_xattr_name);
 631         if (!NT_STATUS_IS_OK(status)) {
 632                 errno = map_errno_from_nt_status(status);
 633                 goto fail;
 634         }
 635         status = streams_xattr_get_name(handle, talloc_tos(),
 636                                         smb_fname_dst->stream_name,
 637                                         &dst_xattr_name);
 638         if (!NT_STATUS_IS_OK(status)) {
 639                 errno = map_errno_from_nt_status(status);
 640                 goto fail;
 641         }
 642
 643         /* read the old stream */
 644         status = get_ea_value(talloc_tos(), handle->conn, NULL,
 645                               smb_fname_src, src_xattr_name, &ea);
 646         if (!NT_STATUS_IS_OK(status)) {
 647                 errno = ENOENT;
 648                 goto fail;
 649         }
 650
 651         /* (over)write the new stream */
 652         nret = SMB_VFS_SETXATTR(handle->conn, smb_fname_src,
 653                                 dst_xattr_name, ea.value.data, ea.value.length,
 654                                 0);
 655         if (nret < 0) {
 656                 if (errno == ENOATTR) {
 657                         errno = ENOENT;
 658                 }
 659                 goto fail;
 660         }
 661
 662         /* remove the old stream */
 663         oret = SMB_VFS_REMOVEXATTR(handle->conn, smb_fname_src,
 664                                    src_xattr_name);
 665         if (oret < 0) {
 666                 if (errno == ENOATTR) {
 667                         errno = ENOENT;
 668                 }
 669                 goto fail;
 670         }
 671
 672  done:
 673         errno = 0;
 674         ret = 0;
 675  fail:
 676         TALLOC_FREE(src_xattr_name);
 677         TALLOC_FREE(dst_xattr_name);
 678         return ret;
 679 }
 680
 681 static NTSTATUS walk_xattr_streams(vfs_handle_struct *handle,
 682                                 files_struct *fsp,
 683                                 const struct smb_filename *smb_fname,
 684                                 bool (*fn)(struct ea_struct *ea,
 685                                         void *private_data),
 686                                 void *private_data)
 687 {
 688         NTSTATUS status;
 689         char **names;
 690         size_t i, num_names;
 691         struct streams_xattr_config *config;
 692
 693         SMB_VFS_HANDLE_GET_DATA(handle, config, struct streams_xattr_config,
 694                                 return NT_STATUS_UNSUCCESSFUL);
 695
 696         status = get_ea_names_from_file(talloc_tos(),
 697                                 handle->conn,
 698                                 fsp,
 699                                 smb_fname,
 700                                 &names,
 701                                 &num_names);
 702         if (!NT_STATUS_IS_OK(status)) {
 703                 return status;
 704         }
 705
 706         for (i=0; i<num_names; i++) {
 707                 struct ea_struct ea;
 708
 709                 /*
 710                  * We want to check with samba_private_attr_name()
 711                  * whether the xattr name is a private one,
 712                  * unfortunately it flags xattrs that begin with the
 713                  * default streams prefix as private.
 714                  *
 715                  * By only calling samba_private_attr_name() in case
 716                  * the xattr does NOT begin with the default prefix,
 717                  * we know that if it returns 'true' it definitely one
 718                  * of our internal xattr like "user.DOSATTRIB".
 719                  */
 720                 if (strncasecmp_m(names[i], SAMBA_XATTR_DOSSTREAM_PREFIX,
 721                                   strlen(SAMBA_XATTR_DOSSTREAM_PREFIX)) != 0) {
 722                         if (samba_private_attr_name(names[i])) {
 723                                 continue;
 724                         }
 725                 }
 726
 727                 if (strncmp(names[i], config->prefix,
 728                             config->prefix_len) != 0) {
 729                         continue;
 730                 }
 731
 732                 status = get_ea_value(names,
 733                                         handle->conn,
 734                                         NULL,
 735                                         smb_fname,
 736                                         names[i],
 737                                         &ea);
 738                 if (!NT_STATUS_IS_OK(status)) {
 739                         DEBUG(10, ("Could not get ea %s for file %s: %s\n",
 740                                 names[i],
 741                                 smb_fname->base_name,
 742                                 nt_errstr(status)));
 743                         continue;
 744                 }
 745
 746                 ea.name = talloc_asprintf(
 747                         ea.value.data, ":%s%s",
 748                         names[i] + config->prefix_len,
 749                         config->store_stream_type ? "" : ":$DATA");
 750                 if (ea.name == NULL) {
 751                         DEBUG(0, ("talloc failed\n"));
 752                         continue;
 753                 }
 754
 755                 if (!fn(&ea, private_data)) {
 756                         TALLOC_FREE(ea.value.data);
 757                         return NT_STATUS_OK;
 758                 }
 759
 760                 TALLOC_FREE(ea.value.data);
 761         }
 762
 763         TALLOC_FREE(names);
 764         return NT_STATUS_OK;
 765 }
 766
 767 static bool add_one_stream(TALLOC_CTX *mem_ctx, unsigned int *num_streams,
 768                            struct stream_struct **streams,
 769                            const char *name, off_t size,
 770                            off_t alloc_size)
 771 {
 772         struct stream_struct *tmp;
 773
 774         tmp = talloc_realloc(mem_ctx, *streams, struct stream_struct,
 775                                    (*num_streams)+1);
 776         if (tmp == NULL) {
 777                 return false;
 778         }
 779
 780         tmp[*num_streams].name = talloc_strdup(tmp, name);
 781         if (tmp[*num_streams].name == NULL) {
 782                 return false;
 783         }
 784
 785         tmp[*num_streams].size = size;
 786         tmp[*num_streams].alloc_size = alloc_size;
 787
 788         *streams = tmp;
 789         *num_streams += 1;
 790         return true;
 791 }
 792
 793 struct streaminfo_state {
 794         TALLOC_CTX *mem_ctx;
 795         vfs_handle_struct *handle;
 796         unsigned int num_streams;
 797         struct stream_struct *streams;
 798         NTSTATUS status;
 799 };
 800
 801 static bool collect_one_stream(struct ea_struct *ea, void *private_data)
 802 {
 803         struct streaminfo_state *state =
 804                 (struct streaminfo_state *)private_data;
 805
 806         if (!add_one_stream(state->mem_ctx,
 807                             &state->num_streams, &state->streams,
 808                             ea->name, ea->value.length-1,
 809                             smb_roundup(state->handle->conn,
 810                                         ea->value.length-1))) {
 811                 state->status = NT_STATUS_NO_MEMORY;
 812                 return false;
 813         }
 814
 815         return true;
 816 }
 817
 818 static NTSTATUS streams_xattr_streaminfo(vfs_handle_struct *handle,
 819                                          struct files_struct *fsp,
 820                                          const struct smb_filename *smb_fname,
 821                                          TALLOC_CTX *mem_ctx,
 822                                          unsigned int *pnum_streams,
 823                                          struct stream_struct **pstreams)
 824 {
 825         SMB_STRUCT_STAT sbuf;
 826         int ret;
 827         NTSTATUS status;
 828         struct streaminfo_state state;
 829
 830         ret = vfs_stat_smb_basename(handle->conn, smb_fname, &sbuf);
 831         if (ret == -1) {
 832                 return map_nt_error_from_unix(errno);
 833         }
 834
 835         state.streams = *pstreams;
 836         state.num_streams = *pnum_streams;
 837         state.mem_ctx = mem_ctx;
 838         state.handle = handle;
 839         state.status = NT_STATUS_OK;
 840
 841         if (S_ISLNK(sbuf.st_ex_mode)) {
 842                 /*
 843                  * Currently we do't have SMB_VFS_LLISTXATTR
 844                  * inside the VFS which means there's no way
 845                  * to cope with a symlink when lp_posix_pathnames().
 846                  * returns true. For now ignore links.
 847                  * FIXME - by adding SMB_VFS_LLISTXATTR. JRA.
 848                  */
 849                 status = NT_STATUS_OK;
 850         } else {
 851                 status = walk_xattr_streams(handle, fsp, smb_fname,
 852                                     collect_one_stream, &state);
 853         }
 854
 855         if (!NT_STATUS_IS_OK(status)) {
 856                 TALLOC_FREE(state.streams);
 857                 return status;
 858         }
 859
 860         if (!NT_STATUS_IS_OK(state.status)) {
 861                 TALLOC_FREE(state.streams);
 862                 return state.status;
 863         }
 864
 865         *pnum_streams = state.num_streams;
 866         *pstreams = state.streams;
 867
 868         return SMB_VFS_NEXT_STREAMINFO(handle,
 869                         fsp,
 870                         smb_fname,
 871                         mem_ctx,
 872                         pnum_streams,
 873                         pstreams);
 874 }
 875
 876 static uint32_t streams_xattr_fs_capabilities(struct vfs_handle_struct *handle,
 877                         enum timestamp_set_resolution *p_ts_res)
 878 {
 879         return SMB_VFS_NEXT_FS_CAPABILITIES(handle, p_ts_res) | FILE_NAMED_STREAMS;
 880 }
 881
 882 static int streams_xattr_connect(vfs_handle_struct *handle,
 883                                  const char *service, const char *user)
 884 {
 885         struct streams_xattr_config *config;
 886         const char *default_prefix = SAMBA_XATTR_DOSSTREAM_PREFIX;
 887         const char *prefix;
 888         int rc;
 889
 890         rc = SMB_VFS_NEXT_CONNECT(handle, service, user);
 891         if (rc != 0) {
 892                 return rc;
 893         }
 894
 895         config = talloc_zero(handle->conn, struct streams_xattr_config);
 896         if (config == NULL) {
 897                 DEBUG(1, ("talloc_zero() failed\n"));
 898                 errno = ENOMEM;
 899                 return -1;
 900         }
 901
 902         prefix = lp_parm_const_string(SNUM(handle->conn),
 903                                       "streams_xattr", "prefix",
 904                                       default_prefix);
 905         config->prefix = talloc_strdup(config, prefix);
 906         if (config->prefix == NULL) {
 907                 DEBUG(1, ("talloc_strdup() failed\n"));
 908                 errno = ENOMEM;
 909                 return -1;
 910         }
 911         config->prefix_len = strlen(config->prefix);
 912         DEBUG(10, ("streams_xattr using stream prefix: %s\n", config->prefix));
 913
 914         config->store_stream_type = lp_parm_bool(SNUM(handle->conn),
 915                                                  "streams_xattr",
 916                                                  "store_stream_type",
 917                                                  true);
 918
 919         SMB_VFS_HANDLE_SET_DATA(handle, config,
 920                                 NULL, struct stream_xattr_config,
 921                                 return -1);
 922
 923         return 0;
 924 }
 925
 926 static ssize_t streams_xattr_pwrite(vfs_handle_struct *handle,
 927                                     files_struct *fsp, const void *data,
 928                                     size_t n, off_t offset)
 929 {
 930         struct stream_io *sio =
 931                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
 932         struct ea_struct ea;
 933         NTSTATUS status;
 934         struct smb_filename *smb_fname_base = NULL;
 935         int ret;
 936
 937         DEBUG(10, ("streams_xattr_pwrite called for %d bytes\n", (int)n));
 938
 939         if (sio == NULL) {
 940                 return SMB_VFS_NEXT_PWRITE(handle, fsp, data, n, offset);
 941         }
 942
 943         if (!streams_xattr_recheck(sio)) {
 944                 return -1;
 945         }
 946
 947         /* Create an smb_filename with stream_name == NULL. */
 948         smb_fname_base = synthetic_smb_fname(talloc_tos(),
 949                                         sio->base,
 950                                         NULL,
 951                                         NULL,
 952                                         fsp->fsp_name->flags);
 953         if (smb_fname_base == NULL) {
 954                 errno = ENOMEM;
 955                 return -1;
 956         }
 957
 958         status = get_ea_value(talloc_tos(), handle->conn, NULL,
 959                               smb_fname_base, sio->xattr_name, &ea);
 960         if (!NT_STATUS_IS_OK(status)) {
 961                 return -1;
 962         }
 963
 964         if ((offset + n) > ea.value.length-1) {
 965                 uint8_t *tmp;
 966
 967                 tmp = talloc_realloc(talloc_tos(), ea.value.data, uint8_t,
 968                                            offset + n + 1);
 969
 970                 if (tmp == NULL) {
 971                         TALLOC_FREE(ea.value.data);
 972                         errno = ENOMEM;
 973                         return -1;
 974                 }
 975                 ea.value.data = tmp;
 976                 ea.value.length = offset + n + 1;
 977                 ea.value.data[offset+n] = 0;
 978         }
 979
 980         memcpy(ea.value.data + offset, data, n);
 981
 982         ret = SMB_VFS_SETXATTR(fsp->conn,
 983                                fsp->fsp_name,
 984                                sio->xattr_name,
 985                                ea.value.data, ea.value.length, 0);
 986         TALLOC_FREE(ea.value.data);
 987
 988         if (ret == -1) {
 989                 return -1;
 990         }
 991
 992         return n;
 993 }
 994
 995 static ssize_t streams_xattr_pread(vfs_handle_struct *handle,
 996                                    files_struct *fsp, void *data,
 997                                    size_t n, off_t offset)
 998 {
 999         struct stream_io *sio =
1000                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1001         struct ea_struct ea;
1002         NTSTATUS status;
1003         size_t length, overlap;
1004         struct smb_filename *smb_fname_base = NULL;
1005
1006         DEBUG(10, ("streams_xattr_pread: offset=%d, size=%d\n",
1007                    (int)offset, (int)n));
1008
1009         if (sio == NULL) {
1010                 return SMB_VFS_NEXT_PREAD(handle, fsp, data, n, offset);
1011         }
1012
1013         if (!streams_xattr_recheck(sio)) {
1014                 return -1;
1015         }
1016
1017         /* Create an smb_filename with stream_name == NULL. */
1018         smb_fname_base = synthetic_smb_fname(talloc_tos(),
1019                                         sio->base,
1020                                         NULL,
1021                                         NULL,
1022                                         fsp->fsp_name->flags);
1023         if (smb_fname_base == NULL) {
1024                 errno = ENOMEM;
1025                 return -1;
1026         }
1027
1028         status = get_ea_value(talloc_tos(), handle->conn, NULL,
1029                               smb_fname_base, sio->xattr_name, &ea);
1030         if (!NT_STATUS_IS_OK(status)) {
1031                 return -1;
1032         }
1033
1034         length = ea.value.length-1;
1035
1036         DEBUG(10, ("streams_xattr_pread: get_ea_value returned %d bytes\n",
1037                    (int)length));
1038
1039         /* Attempt to read past EOF. */
1040         if (length <= offset) {
1041                 return 0;
1042         }
1043
1044         overlap = (offset + n) > length ? (length - offset) : n;
1045         memcpy(data, ea.value.data + offset, overlap);
1046
1047         TALLOC_FREE(ea.value.data);
1048         return overlap;
1049 }
1050
1051 struct streams_xattr_pread_state {
1052         ssize_t nread;
1053         struct vfs_aio_state vfs_aio_state;
1054 };
1055
1056 static void streams_xattr_pread_done(struct tevent_req *subreq);
1057
1058 static struct tevent_req *streams_xattr_pread_send(
1059         struct vfs_handle_struct *handle,
1060         TALLOC_CTX *mem_ctx,
1061         struct tevent_context *ev,
1062         struct files_struct *fsp,
1063         void *data,
1064         size_t n, off_t offset)
1065 {
1066         struct tevent_req *req = NULL;
1067         struct tevent_req *subreq = NULL;
1068         struct streams_xattr_pread_state *state = NULL;
1069         struct stream_io *sio =
1070                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1071
1072         req = tevent_req_create(mem_ctx, &state,
1073                                 struct streams_xattr_pread_state);
1074         if (req == NULL) {
1075                 return NULL;
1076         }
1077
1078         if (sio == NULL) {
1079                 subreq = SMB_VFS_NEXT_PREAD_SEND(state, ev, handle, fsp,
1080                                                  data, n, offset);
1081                 if (tevent_req_nomem(req, subreq)) {
1082                         return tevent_req_post(req, ev);
1083                 }
1084                 tevent_req_set_callback(subreq, streams_xattr_pread_done, req);
1085                 return req;
1086         }
1087
1088         state->nread = SMB_VFS_PREAD(fsp, data, n, offset);
1089         if (state->nread != n) {
1090                 if (state->nread != -1) {
1091                         errno = EIO;
1092                 }
1093                 tevent_req_error(req, errno);
1094                 return tevent_req_post(req, ev);
1095         }
1096
1097         tevent_req_done(req);
1098         return tevent_req_post(req, ev);
1099 }
1100
1101 static void streams_xattr_pread_done(struct tevent_req *subreq)
1102 {
1103         struct tevent_req *req = tevent_req_callback_data(
1104                 subreq, struct tevent_req);
1105         struct streams_xattr_pread_state *state = tevent_req_data(
1106                 req, struct streams_xattr_pread_state);
1107
1108         state->nread = SMB_VFS_PREAD_RECV(subreq, &state->vfs_aio_state);
1109         TALLOC_FREE(subreq);
1110
1111         if (tevent_req_error(req, state->vfs_aio_state.error)) {
1112                 return;
1113         }
1114         tevent_req_done(req);
1115 }
1116
1117 static ssize_t streams_xattr_pread_recv(struct tevent_req *req,
1118                                         struct vfs_aio_state *vfs_aio_state)
1119 {
1120         struct streams_xattr_pread_state *state = tevent_req_data(
1121                 req, struct streams_xattr_pread_state);
1122
1123         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
1124                 return -1;
1125         }
1126
1127         *vfs_aio_state = state->vfs_aio_state;
1128         return state->nread;
1129 }
1130
1131 struct streams_xattr_pwrite_state {
1132         ssize_t nwritten;
1133         struct vfs_aio_state vfs_aio_state;
1134 };
1135
1136 static void streams_xattr_pwrite_done(struct tevent_req *subreq);
1137
1138 static struct tevent_req *streams_xattr_pwrite_send(
1139         struct vfs_handle_struct *handle,
1140         TALLOC_CTX *mem_ctx,
1141         struct tevent_context *ev,
1142         struct files_struct *fsp,
1143         const void *data,
1144         size_t n, off_t offset)
1145 {
1146         struct tevent_req *req = NULL;
1147         struct tevent_req *subreq = NULL;
1148         struct streams_xattr_pwrite_state *state = NULL;
1149         struct stream_io *sio =
1150                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1151
1152         req = tevent_req_create(mem_ctx, &state,
1153                                 struct streams_xattr_pwrite_state);
1154         if (req == NULL) {
1155                 return NULL;
1156         }
1157
1158         if (sio == NULL) {
1159                 subreq = SMB_VFS_NEXT_PWRITE_SEND(state, ev, handle, fsp,
1160                                                   data, n, offset);
1161                 if (tevent_req_nomem(req, subreq)) {
1162                         return tevent_req_post(req, ev);
1163                 }
1164                 tevent_req_set_callback(subreq, streams_xattr_pwrite_done, req);
1165                 return req;
1166         }
1167
1168         state->nwritten = SMB_VFS_PWRITE(fsp, data, n, offset);
1169         if (state->nwritten != n) {
1170                 if (state->nwritten != -1) {
1171                         errno = EIO;
1172                 }
1173                 tevent_req_error(req, errno);
1174                 return tevent_req_post(req, ev);
1175         }
1176
1177         tevent_req_done(req);
1178         return tevent_req_post(req, ev);
1179 }
1180
1181 static void streams_xattr_pwrite_done(struct tevent_req *subreq)
1182 {
1183         struct tevent_req *req = tevent_req_callback_data(
1184                 subreq, struct tevent_req);
1185         struct streams_xattr_pwrite_state *state = tevent_req_data(
1186                 req, struct streams_xattr_pwrite_state);
1187
1188         state->nwritten = SMB_VFS_PWRITE_RECV(subreq, &state->vfs_aio_state);
1189         TALLOC_FREE(subreq);
1190
1191         if (tevent_req_error(req, state->vfs_aio_state.error)) {
1192                 return;
1193         }
1194         tevent_req_done(req);
1195 }
1196
1197 static ssize_t streams_xattr_pwrite_recv(struct tevent_req *req,
1198                                          struct vfs_aio_state *vfs_aio_state)
1199 {
1200         struct streams_xattr_pwrite_state *state = tevent_req_data(
1201                 req, struct streams_xattr_pwrite_state);
1202
1203         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
1204                 return -1;
1205         }
1206
1207         *vfs_aio_state = state->vfs_aio_state;
1208         return state->nwritten;
1209 }
1210
1211 static int streams_xattr_ftruncate(struct vfs_handle_struct *handle,
1212                                         struct files_struct *fsp,
1213                                         off_t offset)
1214 {
1215         int ret;
1216         uint8_t *tmp;
1217         struct ea_struct ea;
1218         NTSTATUS status;
1219         struct stream_io *sio =
1220                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1221         struct smb_filename *smb_fname_base = NULL;
1222
1223         DEBUG(10, ("streams_xattr_ftruncate called for file %s offset %.0f\n",
1224                    fsp_str_dbg(fsp), (double)offset));
1225
1226         if (sio == NULL) {
1227                 return SMB_VFS_NEXT_FTRUNCATE(handle, fsp, offset);
1228         }
1229
1230         if (!streams_xattr_recheck(sio)) {
1231                 return -1;
1232         }
1233
1234         /* Create an smb_filename with stream_name == NULL. */
1235         smb_fname_base = synthetic_smb_fname(talloc_tos(),
1236                                         sio->base,
1237                                         NULL,
1238                                         NULL,
1239                                         fsp->fsp_name->flags);
1240         if (smb_fname_base == NULL) {
1241                 errno = ENOMEM;
1242                 return -1;
1243         }
1244
1245         status = get_ea_value(talloc_tos(), handle->conn, NULL,
1246                               smb_fname_base, sio->xattr_name, &ea);
1247         if (!NT_STATUS_IS_OK(status)) {
1248                 return -1;
1249         }
1250
1251         tmp = talloc_realloc(talloc_tos(), ea.value.data, uint8_t,
1252                                    offset + 1);
1253
1254         if (tmp == NULL) {
1255                 TALLOC_FREE(ea.value.data);
1256                 errno = ENOMEM;
1257                 return -1;
1258         }
1259
1260         /* Did we expand ? */
1261         if (ea.value.length < offset + 1) {
1262                 memset(&tmp[ea.value.length], '\0',
1263                         offset + 1 - ea.value.length);
1264         }
1265
1266         ea.value.data = tmp;
1267         ea.value.length = offset + 1;
1268         ea.value.data[offset] = 0;
1269
1270         ret = SMB_VFS_SETXATTR(fsp->conn,
1271                                fsp->fsp_name,
1272                                sio->xattr_name,
1273                                ea.value.data, ea.value.length, 0);
1274         TALLOC_FREE(ea.value.data);
1275
1276         if (ret == -1) {
1277                 return -1;
1278         }
1279
1280         return 0;
1281 }
1282
1283 static int streams_xattr_fallocate(struct vfs_handle_struct *handle,
1284                                         struct files_struct *fsp,
1285                                         uint32_t mode,
1286                                         off_t offset,
1287                                         off_t len)
1288 {
1289         struct stream_io *sio =
1290                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1291
1292         DEBUG(10, ("streams_xattr_fallocate called for file %s offset %.0f"
1293                 "len = %.0f\n",
1294                 fsp_str_dbg(fsp), (double)offset, (double)len));
1295
1296         if (sio == NULL) {
1297                 return SMB_VFS_NEXT_FALLOCATE(handle, fsp, mode, offset, len);
1298         }
1299
1300         if (!streams_xattr_recheck(sio)) {
1301                 return -1;
1302         }
1303
1304         /* Let the pwrite code path handle it. */
1305         errno = ENOSYS;
1306         return -1;
1307 }
1308
1309 static int streams_xattr_fchown(vfs_handle_struct *handle, files_struct *fsp,
1310                                 uid_t uid, gid_t gid)
1311 {
1312         struct stream_io *sio =
1313                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1314
1315         if (sio == NULL) {
1316                 return SMB_VFS_NEXT_FCHOWN(handle, fsp, uid, gid);
1317         }
1318
1319         return 0;
1320 }
1321
1322 static int streams_xattr_fchmod(vfs_handle_struct *handle,
1323                                 files_struct *fsp,
1324                                 mode_t mode)
1325 {
1326         struct stream_io *sio =
1327                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1328
1329         if (sio == NULL) {
1330                 return SMB_VFS_NEXT_FCHMOD(handle, fsp, mode);
1331         }
1332
1333         return 0;
1334 }
1335
1336 static ssize_t streams_xattr_fgetxattr(struct vfs_handle_struct *handle,
1337                                        struct files_struct *fsp,
1338                                        const char *name,
1339                                        void *value,
1340                                        size_t size)
1341 {
1342         struct stream_io *sio =
1343                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1344
1345         if (sio == NULL) {
1346                 return SMB_VFS_NEXT_FGETXATTR(handle, fsp, name, value, size);
1347         }
1348
1349         errno = ENOTSUP;
1350         return -1;
1351 }
1352
1353 static ssize_t streams_xattr_flistxattr(struct vfs_handle_struct *handle,
1354                                         struct files_struct *fsp,
1355                                         char *list,
1356                                         size_t size)
1357 {
1358         struct stream_io *sio =
1359                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1360
1361         if (sio == NULL) {
1362                 return SMB_VFS_NEXT_FLISTXATTR(handle, fsp, list, size);
1363         }
1364
1365         errno = ENOTSUP;
1366         return -1;
1367 }
1368
1369 static int streams_xattr_fremovexattr(struct vfs_handle_struct *handle,
1370                                       struct files_struct *fsp,
1371                                       const char *name)
1372 {
1373         struct stream_io *sio =
1374                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1375
1376         if (sio == NULL) {
1377                 return SMB_VFS_NEXT_FREMOVEXATTR(handle, fsp, name);
1378         }
1379
1380         errno = ENOTSUP;
1381         return -1;
1382 }
1383
1384 static int streams_xattr_fsetxattr(struct vfs_handle_struct *handle,
1385                                    struct files_struct *fsp,
1386                                    const char *name,
1387                                    const void *value,
1388                                    size_t size,
1389                                    int flags)
1390 {
1391         struct stream_io *sio =
1392                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1393
1394         if (sio == NULL) {
1395                 return SMB_VFS_NEXT_FSETXATTR(handle, fsp, name, value,
1396                                               size, flags);
1397         }
1398
1399         errno = ENOTSUP;
1400         return -1;
1401 }
1402
1403 static SMB_ACL_T streams_xattr_sys_acl_get_fd(vfs_handle_struct *handle,
1404                                               files_struct *fsp,
1405                                               TALLOC_CTX *mem_ctx)
1406 {
1407         struct stream_io *sio =
1408                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1409
1410         if (sio == NULL) {
1411                 return SMB_VFS_NEXT_SYS_ACL_GET_FD(handle, fsp, mem_ctx);
1412         }
1413
1414         return SMB_VFS_NEXT_SYS_ACL_GET_FILE(
1415                 handle, fsp->base_fsp->fsp_name,
1416                 SMB_ACL_TYPE_ACCESS, mem_ctx);
1417 }
1418
1419 static int streams_xattr_sys_acl_set_fd(vfs_handle_struct *handle,
1420                                         files_struct *fsp,
1421                                         SMB_ACL_T theacl)
1422 {
1423         struct stream_io *sio =
1424                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1425
1426         if (sio == NULL) {
1427                 return SMB_VFS_NEXT_SYS_ACL_SET_FD(handle, fsp, theacl);
1428         }
1429
1430         return 0;
1431 }
1432
1433 static int streams_xattr_sys_acl_blob_get_fd(vfs_handle_struct *handle,
1434                                              files_struct *fsp,
1435                                              TALLOC_CTX *mem_ctx,
1436                                              char **blob_description,
1437                                              DATA_BLOB *blob)
1438 {
1439         struct stream_io *sio =
1440                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1441
1442         if (sio == NULL) {
1443                 return SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FD(handle, fsp, mem_ctx,
1444                                                         blob_description, blob);
1445         }
1446
1447         return SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FILE(
1448                 handle, fsp->base_fsp->fsp_name, mem_ctx,
1449                 blob_description, blob);
1450 }
1451
1452 static NTSTATUS streams_xattr_fget_nt_acl(vfs_handle_struct *handle,
1453                                           files_struct *fsp,
1454                                           uint32_t security_info,
1455                                           TALLOC_CTX *mem_ctx,
1456                                           struct security_descriptor **ppdesc)
1457 {
1458         struct stream_io *sio =
1459                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1460
1461         if (sio == NULL) {
1462                 return SMB_VFS_NEXT_FGET_NT_ACL(handle, fsp, security_info,
1463                                                 mem_ctx, ppdesc);
1464         }
1465
1466         return SMB_VFS_NEXT_GET_NT_ACL(handle, fsp->base_fsp->fsp_name,
1467                                        security_info, mem_ctx, ppdesc);
1468 }
1469
1470 static NTSTATUS streams_xattr_fset_nt_acl(vfs_handle_struct *handle,
1471                                           files_struct *fsp,
1472                                           uint32_t security_info_sent,
1473                                           const struct security_descriptor *psd)
1474 {
1475         struct stream_io *sio =
1476                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1477
1478         if (sio == NULL) {
1479                 return SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp,
1480                                                 security_info_sent, psd);
1481         }
1482
1483         return NT_STATUS_OK;
1484 }
1485
1486 struct streams_xattr_fsync_state {
1487         int ret;
1488         struct vfs_aio_state vfs_aio_state;
1489 };
1490
1491 static void streams_xattr_fsync_done(struct tevent_req *subreq);
1492
1493 static struct tevent_req *streams_xattr_fsync_send(
1494         struct vfs_handle_struct *handle,
1495         TALLOC_CTX *mem_ctx,
1496         struct tevent_context *ev,
1497         struct files_struct *fsp)
1498 {
1499         struct tevent_req *req = NULL;
1500         struct tevent_req *subreq = NULL;
1501         struct streams_xattr_fsync_state *state = NULL;
1502         struct stream_io *sio =
1503                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1504
1505         req = tevent_req_create(mem_ctx, &state,
1506                                 struct streams_xattr_fsync_state);
1507         if (req == NULL) {
1508                 return NULL;
1509         }
1510
1511         if (sio == NULL) {
1512                 subreq = SMB_VFS_NEXT_FSYNC_SEND(state, ev, handle, fsp);
1513                 if (tevent_req_nomem(req, subreq)) {
1514                         return tevent_req_post(req, ev);
1515                 }
1516                 tevent_req_set_callback(subreq, streams_xattr_fsync_done, req);
1517                 return req;
1518         }
1519
1520         /*
1521          * There's no pathname based sync variant and we don't have access to
1522          * the basefile handle, so we can't do anything here.
1523          */
1524
1525         tevent_req_done(req);
1526         return tevent_req_post(req, ev);
1527 }
1528
1529 static void streams_xattr_fsync_done(struct tevent_req *subreq)
1530 {
1531         struct tevent_req *req = tevent_req_callback_data(
1532                 subreq, struct tevent_req);
1533         struct streams_xattr_fsync_state *state = tevent_req_data(
1534                 req, struct streams_xattr_fsync_state);
1535
1536         state->ret = SMB_VFS_FSYNC_RECV(subreq, &state->vfs_aio_state);
1537         TALLOC_FREE(subreq);
1538         if (state->ret != 0) {
1539                 tevent_req_error(req, errno);
1540                 return;
1541         }
1542
1543         tevent_req_done(req);
1544 }
1545
1546 static int streams_xattr_fsync_recv(struct tevent_req *req,
1547                                     struct vfs_aio_state *vfs_aio_state)
1548 {
1549         struct streams_xattr_fsync_state *state = tevent_req_data(
1550                 req, struct streams_xattr_fsync_state);
1551
1552         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
1553                 return -1;
1554         }
1555
1556         *vfs_aio_state = state->vfs_aio_state;
1557         return state->ret;
1558 }
1559
1560 static bool streams_xattr_lock(vfs_handle_struct *handle,
1561                                files_struct *fsp,
1562                                int op,
1563                                off_t offset,
1564                                off_t count,
1565                                int type)
1566 {
1567         struct stream_io *sio =
1568                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1569
1570         if (sio == NULL) {
1571                 return SMB_VFS_NEXT_LOCK(handle, fsp, op, offset, count, type);
1572         }
1573
1574         return true;
1575 }
1576
1577 static bool streams_xattr_getlock(vfs_handle_struct *handle,
1578                                   files_struct *fsp,
1579                                   off_t *poffset,
1580                                   off_t *pcount,
1581                                   int *ptype,
1582                                   pid_t *ppid)
1583 {
1584         struct stream_io *sio =
1585                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1586
1587         if (sio == NULL) {
1588                 return SMB_VFS_NEXT_GETLOCK(handle, fsp, poffset,
1589                                             pcount, ptype, ppid);
1590         }
1591
1592         errno = ENOTSUP;
1593         return false;
1594 }
1595
1596 static int streams_xattr_kernel_flock(vfs_handle_struct *handle,
1597                                       files_struct *fsp,
1598                                       uint32_t share_mode,
1599                                       uint32_t access_mask)
1600 {
1601         struct stream_io *sio =
1602                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1603
1604         if (sio == NULL) {
1605                 return SMB_VFS_NEXT_KERNEL_FLOCK(handle, fsp,
1606                                                  share_mode, access_mask);
1607         }
1608
1609         return 0;
1610 }
1611
1612 static int streams_xattr_linux_setlease(vfs_handle_struct *handle,
1613                                         files_struct *fsp,
1614                                         int leasetype)
1615 {
1616         struct stream_io *sio =
1617                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1618
1619         if (sio == NULL) {
1620                 return SMB_VFS_NEXT_LINUX_SETLEASE(handle, fsp, leasetype);
1621         }
1622
1623         return 0;
1624 }
1625
1626 static bool streams_xattr_strict_lock_check(struct vfs_handle_struct *handle,
1627                                             files_struct *fsp,
1628                                             struct lock_struct *plock)
1629 {
1630         struct stream_io *sio =
1631                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1632
1633         if (sio == NULL) {
1634                 return SMB_VFS_NEXT_STRICT_LOCK_CHECK(handle, fsp, plock);
1635         }
1636
1637         return true;
1638 }
1639
1640 static struct vfs_fn_pointers vfs_streams_xattr_fns = {
1641         .fs_capabilities_fn = streams_xattr_fs_capabilities,
1642         .connect_fn = streams_xattr_connect,
1643         .open_fn = streams_xattr_open,
1644         .stat_fn = streams_xattr_stat,
1645         .fstat_fn = streams_xattr_fstat,
1646         .lstat_fn = streams_xattr_lstat,
1647         .pread_fn = streams_xattr_pread,
1648         .pwrite_fn = streams_xattr_pwrite,
1649         .pread_send_fn = streams_xattr_pread_send,
1650         .pread_recv_fn = streams_xattr_pread_recv,
1651         .pwrite_send_fn = streams_xattr_pwrite_send,
1652         .pwrite_recv_fn = streams_xattr_pwrite_recv,
1653         .unlink_fn = streams_xattr_unlink,
1654         .rename_fn = streams_xattr_rename,
1655         .ftruncate_fn = streams_xattr_ftruncate,
1656         .fallocate_fn = streams_xattr_fallocate,
1657         .streaminfo_fn = streams_xattr_streaminfo,
1658
1659         .fsync_send_fn = streams_xattr_fsync_send,
1660         .fsync_recv_fn = streams_xattr_fsync_recv,
1661
1662         .lock_fn = streams_xattr_lock,
1663         .getlock_fn = streams_xattr_getlock,
1664         .kernel_flock_fn = streams_xattr_kernel_flock,
1665         .linux_setlease_fn = streams_xattr_linux_setlease,
1666         .strict_lock_check_fn = streams_xattr_strict_lock_check,
1667
1668         .fchown_fn = streams_xattr_fchown,
1669         .fchmod_fn = streams_xattr_fchmod,
1670
1671         .fgetxattr_fn = streams_xattr_fgetxattr,
1672         .flistxattr_fn = streams_xattr_flistxattr,
1673         .fremovexattr_fn = streams_xattr_fremovexattr,
1674         .fsetxattr_fn = streams_xattr_fsetxattr,
1675
1676         .sys_acl_get_fd_fn = streams_xattr_sys_acl_get_fd,
1677         .sys_acl_blob_get_fd_fn = streams_xattr_sys_acl_blob_get_fd,
1678         .sys_acl_set_fd_fn = streams_xattr_sys_acl_set_fd,
1679
1680         .fget_nt_acl_fn = streams_xattr_fget_nt_acl,
1681         .fset_nt_acl_fn = streams_xattr_fset_nt_acl,
1682 };
1683
1684 static_decl_vfs;
1685 NTSTATUS vfs_streams_xattr_init(TALLOC_CTX *ctx)
1686 {
1687         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "streams_xattr",
1688                                 &vfs_streams_xattr_fns);
1689 }