source3/modules/vfs_streams_xattr.c

   1 /*
   2  * Store streams in xattrs
   3  *
   4  * Copyright (C) Volker Lendecke, 2008
   5  *
   6  * Partly based on James Peach's Darwin module, which is
   7  *
   8  * Copyright (C) James Peach 2006-2007
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 3 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  22  */
  23
  24 #include "includes.h"
  25 #include "smbd/smbd.h"
  26 #include "system/filesys.h"
  27 #include "../lib/crypto/md5.h"
  28 #include "lib/util/tevent_unix.h"
  29 #include "librpc/gen_ndr/ioctl.h"
  30
  31 #undef DBGC_CLASS
  32 #define DBGC_CLASS DBGC_VFS
  33
  34 struct streams_xattr_config {
  35         const char *prefix;
  36         size_t prefix_len;
  37         bool store_stream_type;
  38 };
  39
  40 struct stream_io {
  41         char *base;
  42         char *xattr_name;
  43         void *fsp_name_ptr;
  44         files_struct *fsp;
  45         vfs_handle_struct *handle;
  46 };
  47
  48 static SMB_INO_T stream_inode(const SMB_STRUCT_STAT *sbuf, const char *sname)
  49 {
  50         MD5_CTX ctx;
  51         unsigned char hash[16];
  52         SMB_INO_T result;
  53         char *upper_sname;
  54
  55         DEBUG(10, ("stream_inode called for %lu/%lu [%s]\n",
  56                    (unsigned long)sbuf->st_ex_dev,
  57                    (unsigned long)sbuf->st_ex_ino, sname));
  58
  59         upper_sname = talloc_strdup_upper(talloc_tos(), sname);
  60         SMB_ASSERT(upper_sname != NULL);
  61
  62         MD5Init(&ctx);
  63         MD5Update(&ctx, (const unsigned char *)&(sbuf->st_ex_dev),
  64                   sizeof(sbuf->st_ex_dev));
  65         MD5Update(&ctx, (const unsigned char *)&(sbuf->st_ex_ino),
  66                   sizeof(sbuf->st_ex_ino));
  67         MD5Update(&ctx, (unsigned char *)upper_sname,
  68                   talloc_get_size(upper_sname)-1);
  69         MD5Final(hash, &ctx);
  70
  71         TALLOC_FREE(upper_sname);
  72
  73         /* Hopefully all the variation is in the lower 4 (or 8) bytes! */
  74         memcpy(&result, hash, sizeof(result));
  75
  76         DEBUG(10, ("stream_inode returns %lu\n", (unsigned long)result));
  77
  78         return result;
  79 }
  80
  81 static ssize_t get_xattr_size(connection_struct *conn,
  82                                 const struct smb_filename *smb_fname,
  83                                 const char *xattr_name)
  84 {
  85         NTSTATUS status;
  86         struct ea_struct ea;
  87         ssize_t result;
  88
  89         status = get_ea_value(talloc_tos(), conn, NULL, smb_fname,
  90                               xattr_name, &ea);
  91
  92         if (!NT_STATUS_IS_OK(status)) {
  93                 return -1;
  94         }
  95
  96         result = ea.value.length-1;
  97         TALLOC_FREE(ea.value.data);
  98         return result;
  99 }
 100
 101 /**
 102  * Given a stream name, populate xattr_name with the xattr name to use for
 103  * accessing the stream.
 104  */
 105 static NTSTATUS streams_xattr_get_name(vfs_handle_struct *handle,
 106                                        TALLOC_CTX *ctx,
 107                                        const char *stream_name,
 108                                        char **xattr_name)
 109 {
 110         char *sname;
 111         char *stype;
 112         struct streams_xattr_config *config;
 113
 114         SMB_VFS_HANDLE_GET_DATA(handle, config, struct streams_xattr_config,
 115                                 return NT_STATUS_UNSUCCESSFUL);
 116
 117         sname = talloc_strdup(ctx, stream_name + 1);
 118         if (sname == NULL) {
 119                 return NT_STATUS_NO_MEMORY;
 120         }
 121
 122         /*
 123          * With vfs_fruit option "fruit:encoding = native" we're
 124          * already converting stream names that contain illegal NTFS
 125          * characters from their on-the-wire Unicode Private Range
 126          * encoding to their native ASCII representation.
 127          *
 128          * As as result the name of xattrs storing the streams (via
 129          * vfs_streams_xattr) may contain a colon, so we have to use
 130          * strrchr_m() instead of strchr_m() for matching the stream
 131          * type suffix.
 132          *
 133          * In check_path_syntax() we've already ensured the streamname
 134          * we got from the client is valid.
 135          */
 136         stype = strrchr_m(sname, ':');
 137
 138         if (stype) {
 139                 /*
 140                  * We only support one stream type: "$DATA"
 141                  */
 142                 if (strcasecmp_m(stype, ":$DATA") != 0) {
 143                         talloc_free(sname);
 144                         return NT_STATUS_INVALID_PARAMETER;
 145                 }
 146
 147                 /* Split name and type */
 148                 stype[0] = '\0';
 149         }
 150
 151         *xattr_name = talloc_asprintf(ctx, "%s%s%s",
 152                                       config->prefix,
 153                                       sname,
 154                                       config->store_stream_type ? ":$DATA" : "");
 155         if (*xattr_name == NULL) {
 156                 talloc_free(sname);
 157                 return NT_STATUS_NO_MEMORY;
 158         }
 159
 160         DEBUG(10, ("xattr_name: %s, stream_name: %s\n", *xattr_name,
 161                    stream_name));
 162
 163         talloc_free(sname);
 164         return NT_STATUS_OK;
 165 }
 166
 167 static bool streams_xattr_recheck(struct stream_io *sio)
 168 {
 169         NTSTATUS status;
 170         char *xattr_name = NULL;
 171
 172         if (sio->fsp->fsp_name == sio->fsp_name_ptr) {
 173                 return true;
 174         }
 175
 176         if (sio->fsp->fsp_name->stream_name == NULL) {
 177                 /* how can this happen */
 178                 errno = EINVAL;
 179                 return false;
 180         }
 181
 182         status = streams_xattr_get_name(sio->handle, talloc_tos(),
 183                                         sio->fsp->fsp_name->stream_name,
 184                                         &xattr_name);
 185         if (!NT_STATUS_IS_OK(status)) {
 186                 return false;
 187         }
 188
 189         TALLOC_FREE(sio->xattr_name);
 190         TALLOC_FREE(sio->base);
 191         sio->xattr_name = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(sio->handle, sio->fsp),
 192                                         xattr_name);
 193         sio->base = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(sio->handle, sio->fsp),
 194                                   sio->fsp->fsp_name->base_name);
 195         sio->fsp_name_ptr = sio->fsp->fsp_name;
 196
 197         TALLOC_FREE(xattr_name);
 198
 199         if ((sio->xattr_name == NULL) || (sio->base == NULL)) {
 200                 return false;
 201         }
 202
 203         return true;
 204 }
 205
 206 /**
 207  * Helper to stat/lstat the base file of an smb_fname.
 208  */
 209 static int streams_xattr_stat_base(vfs_handle_struct *handle,
 210                                    struct smb_filename *smb_fname,
 211                                    bool follow_links)
 212 {
 213         char *tmp_stream_name;
 214         int result;
 215
 216         tmp_stream_name = smb_fname->stream_name;
 217         smb_fname->stream_name = NULL;
 218         if (follow_links) {
 219                 result = SMB_VFS_NEXT_STAT(handle, smb_fname);
 220         } else {
 221                 result = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 222         }
 223         smb_fname->stream_name = tmp_stream_name;
 224         return result;
 225 }
 226
 227 static int streams_xattr_fstat(vfs_handle_struct *handle, files_struct *fsp,
 228                                SMB_STRUCT_STAT *sbuf)
 229 {
 230         struct smb_filename *smb_fname_base = NULL;
 231         int ret = -1;
 232         struct stream_io *io = (struct stream_io *)
 233                 VFS_FETCH_FSP_EXTENSION(handle, fsp);
 234
 235         if (io == NULL || fsp->base_fsp == NULL) {
 236                 return SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
 237         }
 238
 239         DBG_DEBUG("streams_xattr_fstat called for %s\n", fsp_str_dbg(io->fsp));
 240
 241         if (!streams_xattr_recheck(io)) {
 242                 return -1;
 243         }
 244
 245         /* Create an smb_filename with stream_name == NULL. */
 246         smb_fname_base = synthetic_smb_fname(talloc_tos(),
 247                                         io->base,
 248                                         NULL,
 249                                         NULL,
 250                                         fsp->fsp_name->flags);
 251         if (smb_fname_base == NULL) {
 252                 errno = ENOMEM;
 253                 return -1;
 254         }
 255
 256         if (smb_fname_base->flags & SMB_FILENAME_POSIX_PATH) {
 257                 ret = SMB_VFS_LSTAT(handle->conn, smb_fname_base);
 258         } else {
 259                 ret = SMB_VFS_STAT(handle->conn, smb_fname_base);
 260         }
 261         *sbuf = smb_fname_base->st;
 262
 263         if (ret == -1) {
 264                 TALLOC_FREE(smb_fname_base);
 265                 return -1;
 266         }
 267
 268         sbuf->st_ex_size = get_xattr_size(handle->conn,
 269                                         smb_fname_base, io->xattr_name);
 270         if (sbuf->st_ex_size == -1) {
 271                 TALLOC_FREE(smb_fname_base);
 272                 SET_STAT_INVALID(*sbuf);
 273                 return -1;
 274         }
 275
 276         DEBUG(10, ("sbuf->st_ex_size = %d\n", (int)sbuf->st_ex_size));
 277
 278         sbuf->st_ex_ino = stream_inode(sbuf, io->xattr_name);
 279         sbuf->st_ex_mode &= ~S_IFMT;
 280         sbuf->st_ex_mode &= ~S_IFDIR;
 281         sbuf->st_ex_mode |= S_IFREG;
 282         sbuf->st_ex_blocks = sbuf->st_ex_size / STAT_ST_BLOCKSIZE + 1;
 283
 284         TALLOC_FREE(smb_fname_base);
 285         return 0;
 286 }
 287
 288 static int streams_xattr_stat(vfs_handle_struct *handle,
 289                               struct smb_filename *smb_fname)
 290 {
 291         NTSTATUS status;
 292         int result = -1;
 293         char *xattr_name = NULL;
 294
 295         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 296                 return SMB_VFS_NEXT_STAT(handle, smb_fname);
 297         }
 298
 299         /* Note if lp_posix_paths() is true, we can never
 300          * get here as is_ntfs_stream_smb_fname() is
 301          * always false. So we never need worry about
 302          * not following links here. */
 303
 304         /* If the default stream is requested, just stat the base file. */
 305         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 306                 return streams_xattr_stat_base(handle, smb_fname, true);
 307         }
 308
 309         /* Populate the stat struct with info from the base file. */
 310         if (streams_xattr_stat_base(handle, smb_fname, true) == -1) {
 311                 return -1;
 312         }
 313
 314         /* Derive the xattr name to lookup. */
 315         status = streams_xattr_get_name(handle, talloc_tos(),
 316                                         smb_fname->stream_name, &xattr_name);
 317         if (!NT_STATUS_IS_OK(status)) {
 318                 errno = map_errno_from_nt_status(status);
 319                 return -1;
 320         }
 321
 322         /* Augment the base file's stat information before returning. */
 323         smb_fname->st.st_ex_size = get_xattr_size(handle->conn,
 324                                                   smb_fname,
 325                                                   xattr_name);
 326         if (smb_fname->st.st_ex_size == -1) {
 327                 SET_STAT_INVALID(smb_fname->st);
 328                 errno = ENOENT;
 329                 result = -1;
 330                 goto fail;
 331         }
 332
 333         smb_fname->st.st_ex_ino = stream_inode(&smb_fname->st, xattr_name);
 334         smb_fname->st.st_ex_mode &= ~S_IFMT;
 335         smb_fname->st.st_ex_mode &= ~S_IFDIR;
 336         smb_fname->st.st_ex_mode |= S_IFREG;
 337         smb_fname->st.st_ex_blocks =
 338             smb_fname->st.st_ex_size / STAT_ST_BLOCKSIZE + 1;
 339
 340         result = 0;
 341  fail:
 342         TALLOC_FREE(xattr_name);
 343         return result;
 344 }
 345
 346 static int streams_xattr_lstat(vfs_handle_struct *handle,
 347                                struct smb_filename *smb_fname)
 348 {
 349         NTSTATUS status;
 350         int result = -1;
 351         char *xattr_name = NULL;
 352
 353         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 354                 return SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 355         }
 356
 357         /* If the default stream is requested, just stat the base file. */
 358         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 359                 return streams_xattr_stat_base(handle, smb_fname, false);
 360         }
 361
 362         /* Populate the stat struct with info from the base file. */
 363         if (streams_xattr_stat_base(handle, smb_fname, false) == -1) {
 364                 return -1;
 365         }
 366
 367         /* Derive the xattr name to lookup. */
 368         status = streams_xattr_get_name(handle, talloc_tos(),
 369                                         smb_fname->stream_name, &xattr_name);
 370         if (!NT_STATUS_IS_OK(status)) {
 371                 errno = map_errno_from_nt_status(status);
 372                 return -1;
 373         }
 374
 375         /* Augment the base file's stat information before returning. */
 376         smb_fname->st.st_ex_size = get_xattr_size(handle->conn,
 377                                                   smb_fname,
 378                                                   xattr_name);
 379         if (smb_fname->st.st_ex_size == -1) {
 380                 SET_STAT_INVALID(smb_fname->st);
 381                 errno = ENOENT;
 382                 result = -1;
 383                 goto fail;
 384         }
 385
 386         smb_fname->st.st_ex_ino = stream_inode(&smb_fname->st, xattr_name);
 387         smb_fname->st.st_ex_mode &= ~S_IFMT;
 388         smb_fname->st.st_ex_mode |= S_IFREG;
 389         smb_fname->st.st_ex_blocks =
 390             smb_fname->st.st_ex_size / STAT_ST_BLOCKSIZE + 1;
 391
 392         result = 0;
 393
 394  fail:
 395         TALLOC_FREE(xattr_name);
 396         return result;
 397 }
 398
 399 static int streams_xattr_open(vfs_handle_struct *handle,
 400                               struct smb_filename *smb_fname,
 401                               files_struct *fsp, int flags, mode_t mode)
 402 {
 403         NTSTATUS status;
 404         struct streams_xattr_config *config = NULL;
 405         struct stream_io *sio = NULL;
 406         struct ea_struct ea;
 407         char *xattr_name = NULL;
 408         int pipe_fds[2];
 409         int fakefd = -1;
 410         int ret;
 411
 412         SMB_VFS_HANDLE_GET_DATA(handle, config, struct streams_xattr_config,
 413                                 return -1);
 414
 415         DEBUG(10, ("streams_xattr_open called for %s with flags 0x%x\n",
 416                    smb_fname_str_dbg(smb_fname), flags));
 417
 418         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 419                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 420         }
 421
 422         /* If the default stream is requested, just open the base file. */
 423         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 424                 char *tmp_stream_name;
 425
 426                 tmp_stream_name = smb_fname->stream_name;
 427                 smb_fname->stream_name = NULL;
 428
 429                 ret = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 430
 431                 smb_fname->stream_name = tmp_stream_name;
 432
 433                 return ret;
 434         }
 435
 436         status = streams_xattr_get_name(handle, talloc_tos(),
 437                                         smb_fname->stream_name, &xattr_name);
 438         if (!NT_STATUS_IS_OK(status)) {
 439                 errno = map_errno_from_nt_status(status);
 440                 goto fail;
 441         }
 442
 443         /*
 444          * Return a valid fd, but ensure any attempt to use it returns an error
 445          * (EPIPE).
 446          */
 447         ret = pipe(pipe_fds);
 448         if (ret != 0) {
 449                 goto fail;
 450         }
 451
 452         close(pipe_fds[1]);
 453         pipe_fds[1] = -1;
 454         fakefd = pipe_fds[0];
 455
 456         status = get_ea_value(talloc_tos(), handle->conn, NULL,
 457                               smb_fname, xattr_name, &ea);
 458
 459         DEBUG(10, ("get_ea_value returned %s\n", nt_errstr(status)));
 460
 461         if (!NT_STATUS_IS_OK(status)
 462             && !NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 463                 /*
 464                  * The base file is not there. This is an error even if we got
 465                  * O_CREAT, the higher levels should have created the base
 466                  * file for us.
 467                  */
 468                 DEBUG(10, ("streams_xattr_open: base file %s not around, "
 469                            "returning ENOENT\n", smb_fname->base_name));
 470                 errno = ENOENT;
 471                 goto fail;
 472         }
 473
 474         if ((!NT_STATUS_IS_OK(status) && (flags & O_CREAT)) ||
 475             (flags & O_TRUNC)) {
 476                 /*
 477                  * The attribute does not exist or needs to be truncated
 478                  */
 479
 480                 /*
 481                  * Darn, xattrs need at least 1 byte
 482                  */
 483                 char null = '\0';
 484
 485                 DEBUG(10, ("creating or truncating attribute %s on file %s\n",
 486                            xattr_name, smb_fname->base_name));
 487
 488                 ret = SMB_VFS_SETXATTR(fsp->conn,
 489                                        smb_fname,
 490                                        xattr_name,
 491                                        &null, sizeof(null),
 492                                        flags & O_EXCL ? XATTR_CREATE : 0);
 493                 if (ret != 0) {
 494                         goto fail;
 495                 }
 496         }
 497
 498         sio = VFS_ADD_FSP_EXTENSION(handle, fsp, struct stream_io, NULL);
 499         if (sio == NULL) {
 500                 errno = ENOMEM;
 501                 goto fail;
 502         }
 503
 504         sio->xattr_name = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(handle, fsp),
 505                                         xattr_name);
 506         if (sio->xattr_name == NULL) {
 507                 errno = ENOMEM;
 508                 goto fail;
 509         }
 510
 511         /*
 512          * so->base needs to be a copy of fsp->fsp_name->base_name,
 513          * making it identical to streams_xattr_recheck(). If the
 514          * open is changing directories, fsp->fsp_name->base_name
 515          * will be the full path from the share root, whilst
 516          * smb_fname will be relative to the $cwd.
 517          */
 518         sio->base = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(handle, fsp),
 519                                   fsp->fsp_name->base_name);
 520         if (sio->base == NULL) {
 521                 errno = ENOMEM;
 522                 goto fail;
 523         }
 524
 525         sio->fsp_name_ptr = fsp->fsp_name;
 526         sio->handle = handle;
 527         sio->fsp = fsp;
 528
 529         return fakefd;
 530
 531  fail:
 532         if (fakefd >= 0) {
 533                 close(fakefd);
 534                 fakefd = -1;
 535         }
 536
 537         return -1;
 538 }
 539
 540 static int streams_xattr_unlink(vfs_handle_struct *handle,
 541                                 const struct smb_filename *smb_fname)
 542 {
 543         NTSTATUS status;
 544         int ret = -1;
 545         char *xattr_name = NULL;
 546
 547         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 548                 return SMB_VFS_NEXT_UNLINK(handle, smb_fname);
 549         }
 550
 551         /* If the default stream is requested, just open the base file. */
 552         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 553                 struct smb_filename *smb_fname_base = NULL;
 554
 555                 smb_fname_base = cp_smb_filename(talloc_tos(), smb_fname);
 556                 if (smb_fname_base == NULL) {
 557                         errno = ENOMEM;
 558                         return -1;
 559                 }
 560
 561                 ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname_base);
 562
 563                 TALLOC_FREE(smb_fname_base);
 564                 return ret;
 565         }
 566
 567         status = streams_xattr_get_name(handle, talloc_tos(),
 568                                         smb_fname->stream_name, &xattr_name);
 569         if (!NT_STATUS_IS_OK(status)) {
 570                 errno = map_errno_from_nt_status(status);
 571                 goto fail;
 572         }
 573
 574         ret = SMB_VFS_REMOVEXATTR(handle->conn, smb_fname, xattr_name);
 575
 576         if ((ret == -1) && (errno == ENOATTR)) {
 577                 errno = ENOENT;
 578                 goto fail;
 579         }
 580
 581         ret = 0;
 582
 583  fail:
 584         TALLOC_FREE(xattr_name);
 585         return ret;
 586 }
 587
 588 static int streams_xattr_rename(vfs_handle_struct *handle,
 589                                 const struct smb_filename *smb_fname_src,
 590                                 const struct smb_filename *smb_fname_dst)
 591 {
 592         NTSTATUS status;
 593         int ret = -1;
 594         char *src_xattr_name = NULL;
 595         char *dst_xattr_name = NULL;
 596         bool src_is_stream, dst_is_stream;
 597         ssize_t oret;
 598         ssize_t nret;
 599         struct ea_struct ea;
 600
 601         src_is_stream = is_ntfs_stream_smb_fname(smb_fname_src);
 602         dst_is_stream = is_ntfs_stream_smb_fname(smb_fname_dst);
 603
 604         if (!src_is_stream && !dst_is_stream) {
 605                 return SMB_VFS_NEXT_RENAME(handle, smb_fname_src,
 606                                            smb_fname_dst);
 607         }
 608
 609         /* For now don't allow renames from or to the default stream. */
 610         if (is_ntfs_default_stream_smb_fname(smb_fname_src) ||
 611             is_ntfs_default_stream_smb_fname(smb_fname_dst)) {
 612                 errno = ENOSYS;
 613                 goto done;
 614         }
 615
 616         /* Don't rename if the streams are identical. */
 617         if (strcasecmp_m(smb_fname_src->stream_name,
 618                        smb_fname_dst->stream_name) == 0) {
 619                 goto done;
 620         }
 621
 622         /* Get the xattr names. */
 623         status = streams_xattr_get_name(handle, talloc_tos(),
 624                                         smb_fname_src->stream_name,
 625                                         &src_xattr_name);
 626         if (!NT_STATUS_IS_OK(status)) {
 627                 errno = map_errno_from_nt_status(status);
 628                 goto fail;
 629         }
 630         status = streams_xattr_get_name(handle, talloc_tos(),
 631                                         smb_fname_dst->stream_name,
 632                                         &dst_xattr_name);
 633         if (!NT_STATUS_IS_OK(status)) {
 634                 errno = map_errno_from_nt_status(status);
 635                 goto fail;
 636         }
 637
 638         /* read the old stream */
 639         status = get_ea_value(talloc_tos(), handle->conn, NULL,
 640                               smb_fname_src, src_xattr_name, &ea);
 641         if (!NT_STATUS_IS_OK(status)) {
 642                 errno = ENOENT;
 643                 goto fail;
 644         }
 645
 646         /* (over)write the new stream */
 647         nret = SMB_VFS_SETXATTR(handle->conn, smb_fname_src,
 648                                 dst_xattr_name, ea.value.data, ea.value.length,
 649                                 0);
 650         if (nret < 0) {
 651                 if (errno == ENOATTR) {
 652                         errno = ENOENT;
 653                 }
 654                 goto fail;
 655         }
 656
 657         /* remove the old stream */
 658         oret = SMB_VFS_REMOVEXATTR(handle->conn, smb_fname_src,
 659                                    src_xattr_name);
 660         if (oret < 0) {
 661                 if (errno == ENOATTR) {
 662                         errno = ENOENT;
 663                 }
 664                 goto fail;
 665         }
 666
 667  done:
 668         errno = 0;
 669         ret = 0;
 670  fail:
 671         TALLOC_FREE(src_xattr_name);
 672         TALLOC_FREE(dst_xattr_name);
 673         return ret;
 674 }
 675
 676 static NTSTATUS walk_xattr_streams(vfs_handle_struct *handle,
 677                                 files_struct *fsp,
 678                                 const struct smb_filename *smb_fname,
 679                                 bool (*fn)(struct ea_struct *ea,
 680                                         void *private_data),
 681                                 void *private_data)
 682 {
 683         NTSTATUS status;
 684         char **names;
 685         size_t i, num_names;
 686         struct streams_xattr_config *config;
 687
 688         SMB_VFS_HANDLE_GET_DATA(handle, config, struct streams_xattr_config,
 689                                 return NT_STATUS_UNSUCCESSFUL);
 690
 691         status = get_ea_names_from_file(talloc_tos(),
 692                                 handle->conn,
 693                                 fsp,
 694                                 smb_fname,
 695                                 &names,
 696                                 &num_names);
 697         if (!NT_STATUS_IS_OK(status)) {
 698                 return status;
 699         }
 700
 701         for (i=0; i<num_names; i++) {
 702                 struct ea_struct ea;
 703
 704                 /*
 705                  * We want to check with samba_private_attr_name()
 706                  * whether the xattr name is a private one,
 707                  * unfortunately it flags xattrs that begin with the
 708                  * default streams prefix as private.
 709                  *
 710                  * By only calling samba_private_attr_name() in case
 711                  * the xattr does NOT begin with the default prefix,
 712                  * we know that if it returns 'true' it definitely one
 713                  * of our internal xattr like "user.DOSATTRIB".
 714                  */
 715                 if (strncasecmp_m(names[i], SAMBA_XATTR_DOSSTREAM_PREFIX,
 716                                   strlen(SAMBA_XATTR_DOSSTREAM_PREFIX)) != 0) {
 717                         if (samba_private_attr_name(names[i])) {
 718                                 continue;
 719                         }
 720                 }
 721
 722                 if (strncmp(names[i], config->prefix,
 723                             config->prefix_len) != 0) {
 724                         continue;
 725                 }
 726
 727                 status = get_ea_value(names,
 728                                         handle->conn,
 729                                         NULL,
 730                                         smb_fname,
 731                                         names[i],
 732                                         &ea);
 733                 if (!NT_STATUS_IS_OK(status)) {
 734                         DEBUG(10, ("Could not get ea %s for file %s: %s\n",
 735                                 names[i],
 736                                 smb_fname->base_name,
 737                                 nt_errstr(status)));
 738                         continue;
 739                 }
 740
 741                 ea.name = talloc_asprintf(
 742                         ea.value.data, ":%s%s",
 743                         names[i] + config->prefix_len,
 744                         config->store_stream_type ? "" : ":$DATA");
 745                 if (ea.name == NULL) {
 746                         DEBUG(0, ("talloc failed\n"));
 747                         continue;
 748                 }
 749
 750                 if (!fn(&ea, private_data)) {
 751                         TALLOC_FREE(ea.value.data);
 752                         return NT_STATUS_OK;
 753                 }
 754
 755                 TALLOC_FREE(ea.value.data);
 756         }
 757
 758         TALLOC_FREE(names);
 759         return NT_STATUS_OK;
 760 }
 761
 762 static bool add_one_stream(TALLOC_CTX *mem_ctx, unsigned int *num_streams,
 763                            struct stream_struct **streams,
 764                            const char *name, off_t size,
 765                            off_t alloc_size)
 766 {
 767         struct stream_struct *tmp;
 768
 769         tmp = talloc_realloc(mem_ctx, *streams, struct stream_struct,
 770                                    (*num_streams)+1);
 771         if (tmp == NULL) {
 772                 return false;
 773         }
 774
 775         tmp[*num_streams].name = talloc_strdup(tmp, name);
 776         if (tmp[*num_streams].name == NULL) {
 777                 return false;
 778         }
 779
 780         tmp[*num_streams].size = size;
 781         tmp[*num_streams].alloc_size = alloc_size;
 782
 783         *streams = tmp;
 784         *num_streams += 1;
 785         return true;
 786 }
 787
 788 struct streaminfo_state {
 789         TALLOC_CTX *mem_ctx;
 790         vfs_handle_struct *handle;
 791         unsigned int num_streams;
 792         struct stream_struct *streams;
 793         NTSTATUS status;
 794 };
 795
 796 static bool collect_one_stream(struct ea_struct *ea, void *private_data)
 797 {
 798         struct streaminfo_state *state =
 799                 (struct streaminfo_state *)private_data;
 800
 801         if (!add_one_stream(state->mem_ctx,
 802                             &state->num_streams, &state->streams,
 803                             ea->name, ea->value.length-1,
 804                             smb_roundup(state->handle->conn,
 805                                         ea->value.length-1))) {
 806                 state->status = NT_STATUS_NO_MEMORY;
 807                 return false;
 808         }
 809
 810         return true;
 811 }
 812
 813 static NTSTATUS streams_xattr_streaminfo(vfs_handle_struct *handle,
 814                                          struct files_struct *fsp,
 815                                          const struct smb_filename *smb_fname,
 816                                          TALLOC_CTX *mem_ctx,
 817                                          unsigned int *pnum_streams,
 818                                          struct stream_struct **pstreams)
 819 {
 820         SMB_STRUCT_STAT sbuf;
 821         int ret;
 822         NTSTATUS status;
 823         struct streaminfo_state state;
 824
 825         ret = vfs_stat_smb_basename(handle->conn, smb_fname, &sbuf);
 826         if (ret == -1) {
 827                 return map_nt_error_from_unix(errno);
 828         }
 829
 830         state.streams = *pstreams;
 831         state.num_streams = *pnum_streams;
 832         state.mem_ctx = mem_ctx;
 833         state.handle = handle;
 834         state.status = NT_STATUS_OK;
 835
 836         if (S_ISLNK(sbuf.st_ex_mode)) {
 837                 /*
 838                  * Currently we do't have SMB_VFS_LLISTXATTR
 839                  * inside the VFS which means there's no way
 840                  * to cope with a symlink when lp_posix_pathnames().
 841                  * returns true. For now ignore links.
 842                  * FIXME - by adding SMB_VFS_LLISTXATTR. JRA.
 843                  */
 844                 status = NT_STATUS_OK;
 845         } else {
 846                 status = walk_xattr_streams(handle, fsp, smb_fname,
 847                                     collect_one_stream, &state);
 848         }
 849
 850         if (!NT_STATUS_IS_OK(status)) {
 851                 TALLOC_FREE(state.streams);
 852                 return status;
 853         }
 854
 855         if (!NT_STATUS_IS_OK(state.status)) {
 856                 TALLOC_FREE(state.streams);
 857                 return state.status;
 858         }
 859
 860         *pnum_streams = state.num_streams;
 861         *pstreams = state.streams;
 862
 863         return SMB_VFS_NEXT_STREAMINFO(handle,
 864                         fsp,
 865                         smb_fname,
 866                         mem_ctx,
 867                         pnum_streams,
 868                         pstreams);
 869 }
 870
 871 static uint32_t streams_xattr_fs_capabilities(struct vfs_handle_struct *handle,
 872                         enum timestamp_set_resolution *p_ts_res)
 873 {
 874         return SMB_VFS_NEXT_FS_CAPABILITIES(handle, p_ts_res) | FILE_NAMED_STREAMS;
 875 }
 876
 877 static int streams_xattr_connect(vfs_handle_struct *handle,
 878                                  const char *service, const char *user)
 879 {
 880         struct streams_xattr_config *config;
 881         const char *default_prefix = SAMBA_XATTR_DOSSTREAM_PREFIX;
 882         const char *prefix;
 883         int rc;
 884
 885         rc = SMB_VFS_NEXT_CONNECT(handle, service, user);
 886         if (rc != 0) {
 887                 return rc;
 888         }
 889
 890         config = talloc_zero(handle->conn, struct streams_xattr_config);
 891         if (config == NULL) {
 892                 DEBUG(1, ("talloc_zero() failed\n"));
 893                 errno = ENOMEM;
 894                 return -1;
 895         }
 896
 897         prefix = lp_parm_const_string(SNUM(handle->conn),
 898                                       "streams_xattr", "prefix",
 899                                       default_prefix);
 900         config->prefix = talloc_strdup(config, prefix);
 901         if (config->prefix == NULL) {
 902                 DEBUG(1, ("talloc_strdup() failed\n"));
 903                 errno = ENOMEM;
 904                 return -1;
 905         }
 906         config->prefix_len = strlen(config->prefix);
 907         DEBUG(10, ("streams_xattr using stream prefix: %s\n", config->prefix));
 908
 909         config->store_stream_type = lp_parm_bool(SNUM(handle->conn),
 910                                                  "streams_xattr",
 911                                                  "store_stream_type",
 912                                                  true);
 913
 914         SMB_VFS_HANDLE_SET_DATA(handle, config,
 915                                 NULL, struct stream_xattr_config,
 916                                 return -1);
 917
 918         return 0;
 919 }
 920
 921 static ssize_t streams_xattr_pwrite(vfs_handle_struct *handle,
 922                                     files_struct *fsp, const void *data,
 923                                     size_t n, off_t offset)
 924 {
 925         struct stream_io *sio =
 926                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
 927         struct ea_struct ea;
 928         NTSTATUS status;
 929         struct smb_filename *smb_fname_base = NULL;
 930         int ret;
 931
 932         DEBUG(10, ("streams_xattr_pwrite called for %d bytes\n", (int)n));
 933
 934         if (sio == NULL) {
 935                 return SMB_VFS_NEXT_PWRITE(handle, fsp, data, n, offset);
 936         }
 937
 938         if (!streams_xattr_recheck(sio)) {
 939                 return -1;
 940         }
 941
 942         /* Create an smb_filename with stream_name == NULL. */
 943         smb_fname_base = synthetic_smb_fname(talloc_tos(),
 944                                         sio->base,
 945                                         NULL,
 946                                         NULL,
 947                                         fsp->fsp_name->flags);
 948         if (smb_fname_base == NULL) {
 949                 errno = ENOMEM;
 950                 return -1;
 951         }
 952
 953         status = get_ea_value(talloc_tos(), handle->conn, NULL,
 954                               smb_fname_base, sio->xattr_name, &ea);
 955         if (!NT_STATUS_IS_OK(status)) {
 956                 return -1;
 957         }
 958
 959         if ((offset + n) > ea.value.length-1) {
 960                 uint8_t *tmp;
 961
 962                 tmp = talloc_realloc(talloc_tos(), ea.value.data, uint8_t,
 963                                            offset + n + 1);
 964
 965                 if (tmp == NULL) {
 966                         TALLOC_FREE(ea.value.data);
 967                         errno = ENOMEM;
 968                         return -1;
 969                 }
 970                 ea.value.data = tmp;
 971                 ea.value.length = offset + n + 1;
 972                 ea.value.data[offset+n] = 0;
 973         }
 974
 975         memcpy(ea.value.data + offset, data, n);
 976
 977         ret = SMB_VFS_SETXATTR(fsp->conn,
 978                                fsp->fsp_name,
 979                                sio->xattr_name,
 980                                ea.value.data, ea.value.length, 0);
 981         TALLOC_FREE(ea.value.data);
 982
 983         if (ret == -1) {
 984                 return -1;
 985         }
 986
 987         return n;
 988 }
 989
 990 static ssize_t streams_xattr_pread(vfs_handle_struct *handle,
 991                                    files_struct *fsp, void *data,
 992                                    size_t n, off_t offset)
 993 {
 994         struct stream_io *sio =
 995                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
 996         struct ea_struct ea;
 997         NTSTATUS status;
 998         size_t length, overlap;
 999         struct smb_filename *smb_fname_base = NULL;
1000
1001         DEBUG(10, ("streams_xattr_pread: offset=%d, size=%d\n",
1002                    (int)offset, (int)n));
1003
1004         if (sio == NULL) {
1005                 return SMB_VFS_NEXT_PREAD(handle, fsp, data, n, offset);
1006         }
1007
1008         if (!streams_xattr_recheck(sio)) {
1009                 return -1;
1010         }
1011
1012         /* Create an smb_filename with stream_name == NULL. */
1013         smb_fname_base = synthetic_smb_fname(talloc_tos(),
1014                                         sio->base,
1015                                         NULL,
1016                                         NULL,
1017                                         fsp->fsp_name->flags);
1018         if (smb_fname_base == NULL) {
1019                 errno = ENOMEM;
1020                 return -1;
1021         }
1022
1023         status = get_ea_value(talloc_tos(), handle->conn, NULL,
1024                               smb_fname_base, sio->xattr_name, &ea);
1025         if (!NT_STATUS_IS_OK(status)) {
1026                 return -1;
1027         }
1028
1029         length = ea.value.length-1;
1030
1031         DEBUG(10, ("streams_xattr_pread: get_ea_value returned %d bytes\n",
1032                    (int)length));
1033
1034         /* Attempt to read past EOF. */
1035         if (length <= offset) {
1036                 return 0;
1037         }
1038
1039         overlap = (offset + n) > length ? (length - offset) : n;
1040         memcpy(data, ea.value.data + offset, overlap);
1041
1042         TALLOC_FREE(ea.value.data);
1043         return overlap;
1044 }
1045
1046 struct streams_xattr_pread_state {
1047         ssize_t nread;
1048         struct vfs_aio_state vfs_aio_state;
1049 };
1050
1051 static void streams_xattr_pread_done(struct tevent_req *subreq);
1052
1053 static struct tevent_req *streams_xattr_pread_send(
1054         struct vfs_handle_struct *handle,
1055         TALLOC_CTX *mem_ctx,
1056         struct tevent_context *ev,
1057         struct files_struct *fsp,
1058         void *data,
1059         size_t n, off_t offset)
1060 {
1061         struct tevent_req *req = NULL;
1062         struct tevent_req *subreq = NULL;
1063         struct streams_xattr_pread_state *state = NULL;
1064         struct stream_io *sio =
1065                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1066
1067         req = tevent_req_create(mem_ctx, &state,
1068                                 struct streams_xattr_pread_state);
1069         if (req == NULL) {
1070                 return NULL;
1071         }
1072
1073         if (sio == NULL) {
1074                 subreq = SMB_VFS_NEXT_PREAD_SEND(state, ev, handle, fsp,
1075                                                  data, n, offset);
1076                 if (tevent_req_nomem(req, subreq)) {
1077                         return tevent_req_post(req, ev);
1078                 }
1079                 tevent_req_set_callback(subreq, streams_xattr_pread_done, req);
1080                 return req;
1081         }
1082
1083         state->nread = SMB_VFS_PREAD(fsp, data, n, offset);
1084         if (state->nread != n) {
1085                 if (state->nread != -1) {
1086                         errno = EIO;
1087                 }
1088                 tevent_req_error(req, errno);
1089                 return tevent_req_post(req, ev);
1090         }
1091
1092         tevent_req_done(req);
1093         return tevent_req_post(req, ev);
1094 }
1095
1096 static void streams_xattr_pread_done(struct tevent_req *subreq)
1097 {
1098         struct tevent_req *req = tevent_req_callback_data(
1099                 subreq, struct tevent_req);
1100         struct streams_xattr_pread_state *state = tevent_req_data(
1101                 req, struct streams_xattr_pread_state);
1102
1103         state->nread = SMB_VFS_PREAD_RECV(subreq, &state->vfs_aio_state);
1104         TALLOC_FREE(subreq);
1105
1106         if (tevent_req_error(req, state->vfs_aio_state.error)) {
1107                 return;
1108         }
1109         tevent_req_done(req);
1110 }
1111
1112 static ssize_t streams_xattr_pread_recv(struct tevent_req *req,
1113                                         struct vfs_aio_state *vfs_aio_state)
1114 {
1115         struct streams_xattr_pread_state *state = tevent_req_data(
1116                 req, struct streams_xattr_pread_state);
1117
1118         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
1119                 return -1;
1120         }
1121
1122         *vfs_aio_state = state->vfs_aio_state;
1123         return state->nread;
1124 }
1125
1126 struct streams_xattr_pwrite_state {
1127         ssize_t nwritten;
1128         struct vfs_aio_state vfs_aio_state;
1129 };
1130
1131 static void streams_xattr_pwrite_done(struct tevent_req *subreq);
1132
1133 static struct tevent_req *streams_xattr_pwrite_send(
1134         struct vfs_handle_struct *handle,
1135         TALLOC_CTX *mem_ctx,
1136         struct tevent_context *ev,
1137         struct files_struct *fsp,
1138         const void *data,
1139         size_t n, off_t offset)
1140 {
1141         struct tevent_req *req = NULL;
1142         struct tevent_req *subreq = NULL;
1143         struct streams_xattr_pwrite_state *state = NULL;
1144         struct stream_io *sio =
1145                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1146
1147         req = tevent_req_create(mem_ctx, &state,
1148                                 struct streams_xattr_pwrite_state);
1149         if (req == NULL) {
1150                 return NULL;
1151         }
1152
1153         if (sio == NULL) {
1154                 subreq = SMB_VFS_NEXT_PWRITE_SEND(state, ev, handle, fsp,
1155                                                   data, n, offset);
1156                 if (tevent_req_nomem(req, subreq)) {
1157                         return tevent_req_post(req, ev);
1158                 }
1159                 tevent_req_set_callback(subreq, streams_xattr_pwrite_done, req);
1160                 return req;
1161         }
1162
1163         state->nwritten = SMB_VFS_PWRITE(fsp, data, n, offset);
1164         if (state->nwritten != n) {
1165                 if (state->nwritten != -1) {
1166                         errno = EIO;
1167                 }
1168                 tevent_req_error(req, errno);
1169                 return tevent_req_post(req, ev);
1170         }
1171
1172         tevent_req_done(req);
1173         return tevent_req_post(req, ev);
1174 }
1175
1176 static void streams_xattr_pwrite_done(struct tevent_req *subreq)
1177 {
1178         struct tevent_req *req = tevent_req_callback_data(
1179                 subreq, struct tevent_req);
1180         struct streams_xattr_pwrite_state *state = tevent_req_data(
1181                 req, struct streams_xattr_pwrite_state);
1182
1183         state->nwritten = SMB_VFS_PWRITE_RECV(subreq, &state->vfs_aio_state);
1184         TALLOC_FREE(subreq);
1185
1186         if (tevent_req_error(req, state->vfs_aio_state.error)) {
1187                 return;
1188         }
1189         tevent_req_done(req);
1190 }
1191
1192 static ssize_t streams_xattr_pwrite_recv(struct tevent_req *req,
1193                                          struct vfs_aio_state *vfs_aio_state)
1194 {
1195         struct streams_xattr_pwrite_state *state = tevent_req_data(
1196                 req, struct streams_xattr_pwrite_state);
1197
1198         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
1199                 return -1;
1200         }
1201
1202         *vfs_aio_state = state->vfs_aio_state;
1203         return state->nwritten;
1204 }
1205
1206 static int streams_xattr_ftruncate(struct vfs_handle_struct *handle,
1207                                         struct files_struct *fsp,
1208                                         off_t offset)
1209 {
1210         int ret;
1211         uint8_t *tmp;
1212         struct ea_struct ea;
1213         NTSTATUS status;
1214         struct stream_io *sio =
1215                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1216         struct smb_filename *smb_fname_base = NULL;
1217
1218         DEBUG(10, ("streams_xattr_ftruncate called for file %s offset %.0f\n",
1219                    fsp_str_dbg(fsp), (double)offset));
1220
1221         if (sio == NULL) {
1222                 return SMB_VFS_NEXT_FTRUNCATE(handle, fsp, offset);
1223         }
1224
1225         if (!streams_xattr_recheck(sio)) {
1226                 return -1;
1227         }
1228
1229         /* Create an smb_filename with stream_name == NULL. */
1230         smb_fname_base = synthetic_smb_fname(talloc_tos(),
1231                                         sio->base,
1232                                         NULL,
1233                                         NULL,
1234                                         fsp->fsp_name->flags);
1235         if (smb_fname_base == NULL) {
1236                 errno = ENOMEM;
1237                 return -1;
1238         }
1239
1240         status = get_ea_value(talloc_tos(), handle->conn, NULL,
1241                               smb_fname_base, sio->xattr_name, &ea);
1242         if (!NT_STATUS_IS_OK(status)) {
1243                 return -1;
1244         }
1245
1246         tmp = talloc_realloc(talloc_tos(), ea.value.data, uint8_t,
1247                                    offset + 1);
1248
1249         if (tmp == NULL) {
1250                 TALLOC_FREE(ea.value.data);
1251                 errno = ENOMEM;
1252                 return -1;
1253         }
1254
1255         /* Did we expand ? */
1256         if (ea.value.length < offset + 1) {
1257                 memset(&tmp[ea.value.length], '\0',
1258                         offset + 1 - ea.value.length);
1259         }
1260
1261         ea.value.data = tmp;
1262         ea.value.length = offset + 1;
1263         ea.value.data[offset] = 0;
1264
1265         ret = SMB_VFS_SETXATTR(fsp->conn,
1266                                fsp->fsp_name,
1267                                sio->xattr_name,
1268                                ea.value.data, ea.value.length, 0);
1269         TALLOC_FREE(ea.value.data);
1270
1271         if (ret == -1) {
1272                 return -1;
1273         }
1274
1275         return 0;
1276 }
1277
1278 static int streams_xattr_fallocate(struct vfs_handle_struct *handle,
1279                                         struct files_struct *fsp,
1280                                         uint32_t mode,
1281                                         off_t offset,
1282                                         off_t len)
1283 {
1284         struct stream_io *sio =
1285                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1286
1287         DEBUG(10, ("streams_xattr_fallocate called for file %s offset %.0f"
1288                 "len = %.0f\n",
1289                 fsp_str_dbg(fsp), (double)offset, (double)len));
1290
1291         if (sio == NULL) {
1292                 return SMB_VFS_NEXT_FALLOCATE(handle, fsp, mode, offset, len);
1293         }
1294
1295         if (!streams_xattr_recheck(sio)) {
1296                 return -1;
1297         }
1298
1299         /* Let the pwrite code path handle it. */
1300         errno = ENOSYS;
1301         return -1;
1302 }
1303
1304 static int streams_xattr_fchown(vfs_handle_struct *handle, files_struct *fsp,
1305                                 uid_t uid, gid_t gid)
1306 {
1307         struct stream_io *sio =
1308                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1309
1310         if (sio == NULL) {
1311                 return SMB_VFS_NEXT_FCHOWN(handle, fsp, uid, gid);
1312         }
1313
1314         return 0;
1315 }
1316
1317 static int streams_xattr_fchmod(vfs_handle_struct *handle,
1318                                 files_struct *fsp,
1319                                 mode_t mode)
1320 {
1321         struct stream_io *sio =
1322                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1323
1324         if (sio == NULL) {
1325                 return SMB_VFS_NEXT_FCHMOD(handle, fsp, mode);
1326         }
1327
1328         return 0;
1329 }
1330
1331 static ssize_t streams_xattr_fgetxattr(struct vfs_handle_struct *handle,
1332                                        struct files_struct *fsp,
1333                                        const char *name,
1334                                        void *value,
1335                                        size_t size)
1336 {
1337         struct stream_io *sio =
1338                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1339
1340         if (sio == NULL) {
1341                 return SMB_VFS_NEXT_FGETXATTR(handle, fsp, name, value, size);
1342         }
1343
1344         errno = ENOTSUP;
1345         return -1;
1346 }
1347
1348 static ssize_t streams_xattr_flistxattr(struct vfs_handle_struct *handle,
1349                                         struct files_struct *fsp,
1350                                         char *list,
1351                                         size_t size)
1352 {
1353         struct stream_io *sio =
1354                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1355
1356         if (sio == NULL) {
1357                 return SMB_VFS_NEXT_FLISTXATTR(handle, fsp, list, size);
1358         }
1359
1360         errno = ENOTSUP;
1361         return -1;
1362 }
1363
1364 static int streams_xattr_fremovexattr(struct vfs_handle_struct *handle,
1365                                       struct files_struct *fsp,
1366                                       const char *name)
1367 {
1368         struct stream_io *sio =
1369                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1370
1371         if (sio == NULL) {
1372                 return SMB_VFS_NEXT_FREMOVEXATTR(handle, fsp, name);
1373         }
1374
1375         errno = ENOTSUP;
1376         return -1;
1377 }
1378
1379 static int streams_xattr_fsetxattr(struct vfs_handle_struct *handle,
1380                                    struct files_struct *fsp,
1381                                    const char *name,
1382                                    const void *value,
1383                                    size_t size,
1384                                    int flags)
1385 {
1386         struct stream_io *sio =
1387                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1388
1389         if (sio == NULL) {
1390                 return SMB_VFS_NEXT_FSETXATTR(handle, fsp, name, value,
1391                                               size, flags);
1392         }
1393
1394         errno = ENOTSUP;
1395         return -1;
1396 }
1397
1398 static SMB_ACL_T streams_xattr_sys_acl_get_fd(vfs_handle_struct *handle,
1399                                               files_struct *fsp,
1400                                               TALLOC_CTX *mem_ctx)
1401 {
1402         struct stream_io *sio =
1403                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1404
1405         if (sio == NULL) {
1406                 return SMB_VFS_NEXT_SYS_ACL_GET_FD(handle, fsp, mem_ctx);
1407         }
1408
1409         return SMB_VFS_NEXT_SYS_ACL_GET_FILE(
1410                 handle, fsp->base_fsp->fsp_name,
1411                 SMB_ACL_TYPE_ACCESS, mem_ctx);
1412 }
1413
1414 static int streams_xattr_sys_acl_set_fd(vfs_handle_struct *handle,
1415                                         files_struct *fsp,
1416                                         SMB_ACL_T theacl)
1417 {
1418         struct stream_io *sio =
1419                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1420
1421         if (sio == NULL) {
1422                 return SMB_VFS_NEXT_SYS_ACL_SET_FD(handle, fsp, theacl);
1423         }
1424
1425         return 0;
1426 }
1427
1428 static int streams_xattr_sys_acl_blob_get_fd(vfs_handle_struct *handle,
1429                                              files_struct *fsp,
1430                                              TALLOC_CTX *mem_ctx,
1431                                              char **blob_description,
1432                                              DATA_BLOB *blob)
1433 {
1434         struct stream_io *sio =
1435                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1436
1437         if (sio == NULL) {
1438                 return SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FD(handle, fsp, mem_ctx,
1439                                                         blob_description, blob);
1440         }
1441
1442         return SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FILE(
1443                 handle, fsp->base_fsp->fsp_name, mem_ctx,
1444                 blob_description, blob);
1445 }
1446
1447 static NTSTATUS streams_xattr_fget_nt_acl(vfs_handle_struct *handle,
1448                                           files_struct *fsp,
1449                                           uint32_t security_info,
1450                                           TALLOC_CTX *mem_ctx,
1451                                           struct security_descriptor **ppdesc)
1452 {
1453         struct stream_io *sio =
1454                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1455
1456         if (sio == NULL) {
1457                 return SMB_VFS_NEXT_FGET_NT_ACL(handle, fsp, security_info,
1458                                                 mem_ctx, ppdesc);
1459         }
1460
1461         return SMB_VFS_NEXT_GET_NT_ACL(handle, fsp->base_fsp->fsp_name,
1462                                        security_info, mem_ctx, ppdesc);
1463 }
1464
1465 static NTSTATUS streams_xattr_fset_nt_acl(vfs_handle_struct *handle,
1466                                           files_struct *fsp,
1467                                           uint32_t security_info_sent,
1468                                           const struct security_descriptor *psd)
1469 {
1470         struct stream_io *sio =
1471                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1472
1473         if (sio == NULL) {
1474                 return SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp,
1475                                                 security_info_sent, psd);
1476         }
1477
1478         return NT_STATUS_OK;
1479 }
1480
1481 struct streams_xattr_fsync_state {
1482         int ret;
1483         struct vfs_aio_state vfs_aio_state;
1484 };
1485
1486 static void streams_xattr_fsync_done(struct tevent_req *subreq);
1487
1488 static struct tevent_req *streams_xattr_fsync_send(
1489         struct vfs_handle_struct *handle,
1490         TALLOC_CTX *mem_ctx,
1491         struct tevent_context *ev,
1492         struct files_struct *fsp)
1493 {
1494         struct tevent_req *req = NULL;
1495         struct tevent_req *subreq = NULL;
1496         struct streams_xattr_fsync_state *state = NULL;
1497         struct stream_io *sio =
1498                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1499
1500         req = tevent_req_create(mem_ctx, &state,
1501                                 struct streams_xattr_fsync_state);
1502         if (req == NULL) {
1503                 return NULL;
1504         }
1505
1506         if (sio == NULL) {
1507                 subreq = SMB_VFS_NEXT_FSYNC_SEND(state, ev, handle, fsp);
1508                 if (tevent_req_nomem(req, subreq)) {
1509                         return tevent_req_post(req, ev);
1510                 }
1511                 tevent_req_set_callback(subreq, streams_xattr_fsync_done, req);
1512                 return req;
1513         }
1514
1515         /*
1516          * There's no pathname based sync variant and we don't have access to
1517          * the basefile handle, so we can't do anything here.
1518          */
1519
1520         tevent_req_done(req);
1521         return tevent_req_post(req, ev);
1522 }
1523
1524 static void streams_xattr_fsync_done(struct tevent_req *subreq)
1525 {
1526         struct tevent_req *req = tevent_req_callback_data(
1527                 subreq, struct tevent_req);
1528         struct streams_xattr_fsync_state *state = tevent_req_data(
1529                 req, struct streams_xattr_fsync_state);
1530
1531         state->ret = SMB_VFS_FSYNC_RECV(subreq, &state->vfs_aio_state);
1532         TALLOC_FREE(subreq);
1533         if (state->ret != 0) {
1534                 tevent_req_error(req, errno);
1535                 return;
1536         }
1537
1538         tevent_req_done(req);
1539 }
1540
1541 static int streams_xattr_fsync_recv(struct tevent_req *req,
1542                                     struct vfs_aio_state *vfs_aio_state)
1543 {
1544         struct streams_xattr_fsync_state *state = tevent_req_data(
1545                 req, struct streams_xattr_fsync_state);
1546
1547         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
1548                 return -1;
1549         }
1550
1551         *vfs_aio_state = state->vfs_aio_state;
1552         return state->ret;
1553 }
1554
1555 static bool streams_xattr_lock(vfs_handle_struct *handle,
1556                                files_struct *fsp,
1557                                int op,
1558                                off_t offset,
1559                                off_t count,
1560                                int type)
1561 {
1562         struct stream_io *sio =
1563                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1564
1565         if (sio == NULL) {
1566                 return SMB_VFS_NEXT_LOCK(handle, fsp, op, offset, count, type);
1567         }
1568
1569         return true;
1570 }
1571
1572 static bool streams_xattr_getlock(vfs_handle_struct *handle,
1573                                   files_struct *fsp,
1574                                   off_t *poffset,
1575                                   off_t *pcount,
1576                                   int *ptype,
1577                                   pid_t *ppid)
1578 {
1579         struct stream_io *sio =
1580                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1581
1582         if (sio == NULL) {
1583                 return SMB_VFS_NEXT_GETLOCK(handle, fsp, poffset,
1584                                             pcount, ptype, ppid);
1585         }
1586
1587         errno = ENOTSUP;
1588         return false;
1589 }
1590
1591 static int streams_xattr_kernel_flock(vfs_handle_struct *handle,
1592                                       files_struct *fsp,
1593                                       uint32_t share_mode,
1594                                       uint32_t access_mask)
1595 {
1596         struct stream_io *sio =
1597                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1598
1599         if (sio == NULL) {
1600                 return SMB_VFS_NEXT_KERNEL_FLOCK(handle, fsp,
1601                                                  share_mode, access_mask);
1602         }
1603
1604         return 0;
1605 }
1606
1607 static int streams_xattr_linux_setlease(vfs_handle_struct *handle,
1608                                         files_struct *fsp,
1609                                         int leasetype)
1610 {
1611         struct stream_io *sio =
1612                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1613
1614         if (sio == NULL) {
1615                 return SMB_VFS_NEXT_LINUX_SETLEASE(handle, fsp, leasetype);
1616         }
1617
1618         return 0;
1619 }
1620
1621 static bool streams_xattr_strict_lock_check(struct vfs_handle_struct *handle,
1622                                             files_struct *fsp,
1623                                             struct lock_struct *plock)
1624 {
1625         struct stream_io *sio =
1626                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1627
1628         if (sio == NULL) {
1629                 return SMB_VFS_NEXT_STRICT_LOCK_CHECK(handle, fsp, plock);
1630         }
1631
1632         return true;
1633 }
1634
1635 static struct vfs_fn_pointers vfs_streams_xattr_fns = {
1636         .fs_capabilities_fn = streams_xattr_fs_capabilities,
1637         .connect_fn = streams_xattr_connect,
1638         .open_fn = streams_xattr_open,
1639         .stat_fn = streams_xattr_stat,
1640         .fstat_fn = streams_xattr_fstat,
1641         .lstat_fn = streams_xattr_lstat,
1642         .pread_fn = streams_xattr_pread,
1643         .pwrite_fn = streams_xattr_pwrite,
1644         .pread_send_fn = streams_xattr_pread_send,
1645         .pread_recv_fn = streams_xattr_pread_recv,
1646         .pwrite_send_fn = streams_xattr_pwrite_send,
1647         .pwrite_recv_fn = streams_xattr_pwrite_recv,
1648         .unlink_fn = streams_xattr_unlink,
1649         .rename_fn = streams_xattr_rename,
1650         .ftruncate_fn = streams_xattr_ftruncate,
1651         .fallocate_fn = streams_xattr_fallocate,
1652         .streaminfo_fn = streams_xattr_streaminfo,
1653
1654         .fsync_send_fn = streams_xattr_fsync_send,
1655         .fsync_recv_fn = streams_xattr_fsync_recv,
1656
1657         .lock_fn = streams_xattr_lock,
1658         .getlock_fn = streams_xattr_getlock,
1659         .kernel_flock_fn = streams_xattr_kernel_flock,
1660         .linux_setlease_fn = streams_xattr_linux_setlease,
1661         .strict_lock_check_fn = streams_xattr_strict_lock_check,
1662
1663         .fchown_fn = streams_xattr_fchown,
1664         .fchmod_fn = streams_xattr_fchmod,
1665
1666         .fgetxattr_fn = streams_xattr_fgetxattr,
1667         .flistxattr_fn = streams_xattr_flistxattr,
1668         .fremovexattr_fn = streams_xattr_fremovexattr,
1669         .fsetxattr_fn = streams_xattr_fsetxattr,
1670
1671         .sys_acl_get_fd_fn = streams_xattr_sys_acl_get_fd,
1672         .sys_acl_blob_get_fd_fn = streams_xattr_sys_acl_blob_get_fd,
1673         .sys_acl_set_fd_fn = streams_xattr_sys_acl_set_fd,
1674
1675         .fget_nt_acl_fn = streams_xattr_fget_nt_acl,
1676         .fset_nt_acl_fn = streams_xattr_fset_nt_acl,
1677 };
1678
1679 static_decl_vfs;
1680 NTSTATUS vfs_streams_xattr_init(TALLOC_CTX *ctx)
1681 {
1682         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "streams_xattr",
1683                                 &vfs_streams_xattr_fns);
1684 }