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