2 * Store streams in xattrs
4 * Copyright (C) Volker Lendecke, 2008
6 * Partly based on James Peach's Darwin module, which is
8 * Copyright (C) James Peach 2006-2007
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.
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.
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/>.
25 #include "smbd/smbd.h"
26 #include "system/filesys.h"
27 #include "../lib/crypto/md5.h"
30 #define DBGC_CLASS DBGC_VFS
32 struct streams_xattr_config {
35 bool store_stream_type;
43 vfs_handle_struct *handle;
46 static SMB_INO_T stream_inode(const SMB_STRUCT_STAT *sbuf, const char *sname)
49 unsigned char hash[16];
53 DEBUG(10, ("stream_inode called for %lu/%lu [%s]\n",
54 (unsigned long)sbuf->st_ex_dev,
55 (unsigned long)sbuf->st_ex_ino, sname));
57 upper_sname = talloc_strdup_upper(talloc_tos(), sname);
58 SMB_ASSERT(upper_sname != NULL);
61 MD5Update(&ctx, (const unsigned char *)&(sbuf->st_ex_dev),
62 sizeof(sbuf->st_ex_dev));
63 MD5Update(&ctx, (const unsigned char *)&(sbuf->st_ex_ino),
64 sizeof(sbuf->st_ex_ino));
65 MD5Update(&ctx, (unsigned char *)upper_sname,
66 talloc_get_size(upper_sname)-1);
69 TALLOC_FREE(upper_sname);
71 /* Hopefully all the variation is in the lower 4 (or 8) bytes! */
72 memcpy(&result, hash, sizeof(result));
74 DEBUG(10, ("stream_inode returns %lu\n", (unsigned long)result));
79 static ssize_t get_xattr_size(connection_struct *conn,
82 const char *xattr_name)
88 status = get_ea_value(talloc_tos(), conn, fsp, fname,
91 if (!NT_STATUS_IS_OK(status)) {
95 result = ea.value.length-1;
96 TALLOC_FREE(ea.value.data);
101 * Given a stream name, populate xattr_name with the xattr name to use for
102 * accessing the stream.
104 static NTSTATUS streams_xattr_get_name(vfs_handle_struct *handle,
106 const char *stream_name,
111 struct streams_xattr_config *config;
113 SMB_VFS_HANDLE_GET_DATA(handle, config, struct streams_xattr_config,
114 return NT_STATUS_UNSUCCESSFUL);
116 sname = talloc_strdup(ctx, stream_name + 1);
118 return NT_STATUS_NO_MEMORY;
122 * With vfs_fruit option "fruit:encoding = native" we're
123 * already converting stream names that contain illegal NTFS
124 * characters from their on-the-wire Unicode Private Range
125 * encoding to their native ASCII representation.
127 * As as result the name of xattrs storing the streams (via
128 * vfs_streams_xattr) may contain a colon, so we have to use
129 * strrchr_m() instead of strchr_m() for matching the stream
132 * In check_path_syntax() we've already ensured the streamname
133 * we got from the client is valid.
135 stype = strrchr_m(sname, ':');
139 * We only support one stream type: "$DATA"
141 if (strcasecmp_m(stype, ":$DATA") != 0) {
143 return NT_STATUS_INVALID_PARAMETER;
146 /* Split name and type */
150 *xattr_name = talloc_asprintf(ctx, "%s%s%s",
153 config->store_stream_type ? ":$DATA" : "");
154 if (*xattr_name == NULL) {
156 return NT_STATUS_NO_MEMORY;
159 DEBUG(10, ("xattr_name: %s, stream_name: %s\n", *xattr_name,
166 static bool streams_xattr_recheck(struct stream_io *sio)
169 char *xattr_name = NULL;
171 if (sio->fsp->fsp_name == sio->fsp_name_ptr) {
175 if (sio->fsp->fsp_name->stream_name == NULL) {
176 /* how can this happen */
181 status = streams_xattr_get_name(sio->handle, talloc_tos(),
182 sio->fsp->fsp_name->stream_name,
184 if (!NT_STATUS_IS_OK(status)) {
188 TALLOC_FREE(sio->xattr_name);
189 TALLOC_FREE(sio->base);
190 sio->xattr_name = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(sio->handle, sio->fsp),
192 sio->base = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(sio->handle, sio->fsp),
193 sio->fsp->fsp_name->base_name);
194 sio->fsp_name_ptr = sio->fsp->fsp_name;
196 TALLOC_FREE(xattr_name);
198 if ((sio->xattr_name == NULL) || (sio->base == NULL)) {
206 * Helper to stat/lstat the base file of an smb_fname.
208 static int streams_xattr_stat_base(vfs_handle_struct *handle,
209 struct smb_filename *smb_fname,
212 char *tmp_stream_name;
215 tmp_stream_name = smb_fname->stream_name;
216 smb_fname->stream_name = NULL;
218 result = SMB_VFS_NEXT_STAT(handle, smb_fname);
220 result = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
222 smb_fname->stream_name = tmp_stream_name;
226 static int streams_xattr_fstat(vfs_handle_struct *handle, files_struct *fsp,
227 SMB_STRUCT_STAT *sbuf)
229 struct smb_filename *smb_fname_base = NULL;
231 struct stream_io *io = (struct stream_io *)
232 VFS_FETCH_FSP_EXTENSION(handle, fsp);
234 DEBUG(10, ("streams_xattr_fstat called for %d\n", fsp->fh->fd));
236 if (io == NULL || fsp->base_fsp == NULL) {
237 return SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
240 if (!streams_xattr_recheck(io)) {
244 /* Create an smb_filename with stream_name == NULL. */
245 smb_fname_base = synthetic_smb_fname(talloc_tos(),
249 fsp->fsp_name->flags);
250 if (smb_fname_base == NULL) {
255 if (smb_fname_base->flags & SMB_FILENAME_POSIX_PATH) {
256 ret = SMB_VFS_LSTAT(handle->conn, smb_fname_base);
258 ret = SMB_VFS_STAT(handle->conn, smb_fname_base);
260 *sbuf = smb_fname_base->st;
261 TALLOC_FREE(smb_fname_base);
267 sbuf->st_ex_size = get_xattr_size(handle->conn, fsp->base_fsp,
268 io->base, io->xattr_name);
269 if (sbuf->st_ex_size == -1) {
273 DEBUG(10, ("sbuf->st_ex_size = %d\n", (int)sbuf->st_ex_size));
275 sbuf->st_ex_ino = stream_inode(sbuf, io->xattr_name);
276 sbuf->st_ex_mode &= ~S_IFMT;
277 sbuf->st_ex_mode |= S_IFREG;
278 sbuf->st_ex_blocks = sbuf->st_ex_size / STAT_ST_BLOCKSIZE + 1;
283 static int streams_xattr_stat(vfs_handle_struct *handle,
284 struct smb_filename *smb_fname)
288 char *xattr_name = NULL;
290 if (!is_ntfs_stream_smb_fname(smb_fname)) {
291 return SMB_VFS_NEXT_STAT(handle, smb_fname);
294 /* Note if lp_posix_paths() is true, we can never
295 * get here as is_ntfs_stream_smb_fname() is
296 * always false. So we never need worry about
297 * not following links here. */
299 /* If the default stream is requested, just stat the base file. */
300 if (is_ntfs_default_stream_smb_fname(smb_fname)) {
301 return streams_xattr_stat_base(handle, smb_fname, true);
304 /* Populate the stat struct with info from the base file. */
305 if (streams_xattr_stat_base(handle, smb_fname, true) == -1) {
309 /* Derive the xattr name to lookup. */
310 status = streams_xattr_get_name(handle, talloc_tos(),
311 smb_fname->stream_name, &xattr_name);
312 if (!NT_STATUS_IS_OK(status)) {
313 errno = map_errno_from_nt_status(status);
317 /* Augment the base file's stat information before returning. */
318 smb_fname->st.st_ex_size = get_xattr_size(handle->conn, NULL,
319 smb_fname->base_name,
321 if (smb_fname->st.st_ex_size == -1) {
327 smb_fname->st.st_ex_ino = stream_inode(&smb_fname->st, xattr_name);
328 smb_fname->st.st_ex_mode &= ~S_IFMT;
329 smb_fname->st.st_ex_mode |= S_IFREG;
330 smb_fname->st.st_ex_blocks =
331 smb_fname->st.st_ex_size / STAT_ST_BLOCKSIZE + 1;
335 TALLOC_FREE(xattr_name);
339 static int streams_xattr_lstat(vfs_handle_struct *handle,
340 struct smb_filename *smb_fname)
344 char *xattr_name = NULL;
346 if (!is_ntfs_stream_smb_fname(smb_fname)) {
347 return SMB_VFS_NEXT_LSTAT(handle, smb_fname);
350 /* If the default stream is requested, just stat the base file. */
351 if (is_ntfs_default_stream_smb_fname(smb_fname)) {
352 return streams_xattr_stat_base(handle, smb_fname, false);
355 /* Populate the stat struct with info from the base file. */
356 if (streams_xattr_stat_base(handle, smb_fname, false) == -1) {
360 /* Derive the xattr name to lookup. */
361 status = streams_xattr_get_name(handle, talloc_tos(),
362 smb_fname->stream_name, &xattr_name);
363 if (!NT_STATUS_IS_OK(status)) {
364 errno = map_errno_from_nt_status(status);
368 /* Augment the base file's stat information before returning. */
369 smb_fname->st.st_ex_size = get_xattr_size(handle->conn, NULL,
370 smb_fname->base_name,
372 if (smb_fname->st.st_ex_size == -1) {
378 smb_fname->st.st_ex_ino = stream_inode(&smb_fname->st, xattr_name);
379 smb_fname->st.st_ex_mode &= ~S_IFMT;
380 smb_fname->st.st_ex_mode |= S_IFREG;
381 smb_fname->st.st_ex_blocks =
382 smb_fname->st.st_ex_size / STAT_ST_BLOCKSIZE + 1;
387 TALLOC_FREE(xattr_name);
391 static int streams_xattr_open(vfs_handle_struct *handle,
392 struct smb_filename *smb_fname,
393 files_struct *fsp, int flags, mode_t mode)
396 struct smb_filename *smb_fname_base = NULL;
397 struct stream_io *sio;
399 char *xattr_name = NULL;
403 DEBUG(10, ("streams_xattr_open called for %s with flags 0x%x\n",
404 smb_fname_str_dbg(smb_fname), flags));
406 if (!is_ntfs_stream_smb_fname(smb_fname)) {
407 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
410 /* If the default stream is requested, just open the base file. */
411 if (is_ntfs_default_stream_smb_fname(smb_fname)) {
412 char *tmp_stream_name;
415 tmp_stream_name = smb_fname->stream_name;
416 smb_fname->stream_name = NULL;
418 ret = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
420 smb_fname->stream_name = tmp_stream_name;
425 status = streams_xattr_get_name(handle, talloc_tos(),
426 smb_fname->stream_name, &xattr_name);
427 if (!NT_STATUS_IS_OK(status)) {
428 errno = map_errno_from_nt_status(status);
432 /* Create an smb_filename with stream_name == NULL. */
433 smb_fname_base = synthetic_smb_fname(talloc_tos(),
434 smb_fname->base_name,
438 if (smb_fname_base == NULL) {
444 * We use baseflags to turn off nasty side-effects when opening the
448 baseflags &= ~O_TRUNC;
449 baseflags &= ~O_EXCL;
450 baseflags &= ~O_CREAT;
452 hostfd = SMB_VFS_OPEN(handle->conn, smb_fname_base, fsp,
455 TALLOC_FREE(smb_fname_base);
457 /* It is legit to open a stream on a directory, but the base
458 * fd has to be read-only.
460 if ((hostfd == -1) && (errno == EISDIR)) {
461 baseflags &= ~O_ACCMODE;
462 baseflags |= O_RDONLY;
463 hostfd = SMB_VFS_OPEN(handle->conn, smb_fname, fsp, baseflags,
471 status = get_ea_value(talloc_tos(), handle->conn, NULL,
472 smb_fname->base_name, xattr_name, &ea);
474 DEBUG(10, ("get_ea_value returned %s\n", nt_errstr(status)));
476 if (!NT_STATUS_IS_OK(status)
477 && !NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
479 * The base file is not there. This is an error even if we got
480 * O_CREAT, the higher levels should have created the base
483 DEBUG(10, ("streams_xattr_open: base file %s not around, "
484 "returning ENOENT\n", smb_fname->base_name));
489 if ((!NT_STATUS_IS_OK(status) && (flags & O_CREAT)) ||
492 * The attribute does not exist or needs to be truncated
496 * Darn, xattrs need at least 1 byte
500 DEBUG(10, ("creating or truncating attribute %s on file %s\n",
501 xattr_name, smb_fname->base_name));
503 if (fsp->base_fsp->fh->fd != -1) {
504 if (SMB_VFS_FSETXATTR(
505 fsp->base_fsp, xattr_name,
507 flags & O_EXCL ? XATTR_CREATE : 0) == -1) {
511 if (SMB_VFS_SETXATTR(
512 handle->conn, smb_fname->base_name,
513 xattr_name, &null, sizeof(null),
514 flags & O_EXCL ? XATTR_CREATE : 0) == -1) {
520 sio = (struct stream_io *)VFS_ADD_FSP_EXTENSION(handle, fsp,
528 sio->xattr_name = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(handle, fsp),
531 * so->base needs to be a copy of fsp->fsp_name->base_name,
532 * making it identical to streams_xattr_recheck(). If the
533 * open is changing directories, fsp->fsp_name->base_name
534 * will be the full path from the share root, whilst
535 * smb_fname will be relative to the $cwd.
537 sio->base = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(handle, fsp),
538 fsp->fsp_name->base_name);
539 sio->fsp_name_ptr = fsp->fsp_name;
540 sio->handle = handle;
543 if ((sio->xattr_name == NULL) || (sio->base == NULL)) {
553 * BUGBUGBUG -- we would need to call fd_close_posix here, but
554 * we don't have a full fsp yet
556 fsp->fh->fd = hostfd;
563 static int streams_xattr_unlink(vfs_handle_struct *handle,
564 const struct smb_filename *smb_fname)
568 char *xattr_name = NULL;
570 if (!is_ntfs_stream_smb_fname(smb_fname)) {
571 return SMB_VFS_NEXT_UNLINK(handle, smb_fname);
574 /* If the default stream is requested, just open the base file. */
575 if (is_ntfs_default_stream_smb_fname(smb_fname)) {
576 struct smb_filename *smb_fname_base = NULL;
578 smb_fname_base = cp_smb_filename(talloc_tos(), smb_fname);
579 if (smb_fname_base == NULL) {
584 ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname_base);
586 TALLOC_FREE(smb_fname_base);
590 status = streams_xattr_get_name(handle, talloc_tos(),
591 smb_fname->stream_name, &xattr_name);
592 if (!NT_STATUS_IS_OK(status)) {
593 errno = map_errno_from_nt_status(status);
597 ret = SMB_VFS_REMOVEXATTR(handle->conn, smb_fname->base_name, xattr_name);
599 if ((ret == -1) && (errno == ENOATTR)) {
607 TALLOC_FREE(xattr_name);
611 static int streams_xattr_rename(vfs_handle_struct *handle,
612 const struct smb_filename *smb_fname_src,
613 const struct smb_filename *smb_fname_dst)
617 char *src_xattr_name = NULL;
618 char *dst_xattr_name = NULL;
619 bool src_is_stream, dst_is_stream;
624 src_is_stream = is_ntfs_stream_smb_fname(smb_fname_src);
625 dst_is_stream = is_ntfs_stream_smb_fname(smb_fname_dst);
627 if (!src_is_stream && !dst_is_stream) {
628 return SMB_VFS_NEXT_RENAME(handle, smb_fname_src,
632 /* For now don't allow renames from or to the default stream. */
633 if (is_ntfs_default_stream_smb_fname(smb_fname_src) ||
634 is_ntfs_default_stream_smb_fname(smb_fname_dst)) {
639 /* Don't rename if the streams are identical. */
640 if (strcasecmp_m(smb_fname_src->stream_name,
641 smb_fname_dst->stream_name) == 0) {
645 /* Get the xattr names. */
646 status = streams_xattr_get_name(handle, talloc_tos(),
647 smb_fname_src->stream_name,
649 if (!NT_STATUS_IS_OK(status)) {
650 errno = map_errno_from_nt_status(status);
653 status = streams_xattr_get_name(handle, talloc_tos(),
654 smb_fname_dst->stream_name,
656 if (!NT_STATUS_IS_OK(status)) {
657 errno = map_errno_from_nt_status(status);
661 /* read the old stream */
662 status = get_ea_value(talloc_tos(), handle->conn, NULL,
663 smb_fname_src->base_name, src_xattr_name, &ea);
664 if (!NT_STATUS_IS_OK(status)) {
669 /* (over)write the new stream */
670 nret = SMB_VFS_SETXATTR(handle->conn, smb_fname_src->base_name,
671 dst_xattr_name, ea.value.data, ea.value.length,
674 if (errno == ENOATTR) {
680 /* remove the old stream */
681 oret = SMB_VFS_REMOVEXATTR(handle->conn, smb_fname_src->base_name,
684 if (errno == ENOATTR) {
694 TALLOC_FREE(src_xattr_name);
695 TALLOC_FREE(dst_xattr_name);
699 static NTSTATUS walk_xattr_streams(vfs_handle_struct *handle,
701 const struct smb_filename *smb_fname,
702 bool (*fn)(struct ea_struct *ea,
709 struct streams_xattr_config *config;
711 SMB_VFS_HANDLE_GET_DATA(handle, config, struct streams_xattr_config,
712 return NT_STATUS_UNSUCCESSFUL);
714 status = get_ea_names_from_file(talloc_tos(),
720 if (!NT_STATUS_IS_OK(status)) {
724 for (i=0; i<num_names; i++) {
728 * We want to check with samba_private_attr_name()
729 * whether the xattr name is a private one,
730 * unfortunately it flags xattrs that begin with the
731 * default streams prefix as private.
733 * By only calling samba_private_attr_name() in case
734 * the xattr does NOT begin with the default prefix,
735 * we know that if it returns 'true' it definitely one
736 * of our internal xattr like "user.DOSATTRIB".
738 if (strncasecmp_m(names[i], SAMBA_XATTR_DOSSTREAM_PREFIX,
739 strlen(SAMBA_XATTR_DOSSTREAM_PREFIX)) != 0) {
740 if (samba_private_attr_name(names[i])) {
745 if (strncmp(names[i], config->prefix,
746 config->prefix_len) != 0) {
750 status = get_ea_value(names,
753 smb_fname->base_name,
756 if (!NT_STATUS_IS_OK(status)) {
757 DEBUG(10, ("Could not get ea %s for file %s: %s\n",
759 smb_fname->base_name,
764 ea.name = talloc_asprintf(
765 ea.value.data, ":%s%s",
766 names[i] + config->prefix_len,
767 config->store_stream_type ? "" : ":$DATA");
768 if (ea.name == NULL) {
769 DEBUG(0, ("talloc failed\n"));
773 if (!fn(&ea, private_data)) {
774 TALLOC_FREE(ea.value.data);
778 TALLOC_FREE(ea.value.data);
785 static bool add_one_stream(TALLOC_CTX *mem_ctx, unsigned int *num_streams,
786 struct stream_struct **streams,
787 const char *name, off_t size,
790 struct stream_struct *tmp;
792 tmp = talloc_realloc(mem_ctx, *streams, struct stream_struct,
798 tmp[*num_streams].name = talloc_strdup(tmp, name);
799 if (tmp[*num_streams].name == NULL) {
803 tmp[*num_streams].size = size;
804 tmp[*num_streams].alloc_size = alloc_size;
811 struct streaminfo_state {
813 vfs_handle_struct *handle;
814 unsigned int num_streams;
815 struct stream_struct *streams;
819 static bool collect_one_stream(struct ea_struct *ea, void *private_data)
821 struct streaminfo_state *state =
822 (struct streaminfo_state *)private_data;
824 if (!add_one_stream(state->mem_ctx,
825 &state->num_streams, &state->streams,
826 ea->name, ea->value.length-1,
827 smb_roundup(state->handle->conn,
828 ea->value.length-1))) {
829 state->status = NT_STATUS_NO_MEMORY;
836 static NTSTATUS streams_xattr_streaminfo(vfs_handle_struct *handle,
837 struct files_struct *fsp,
838 const struct smb_filename *smb_fname,
840 unsigned int *pnum_streams,
841 struct stream_struct **pstreams)
843 SMB_STRUCT_STAT sbuf;
846 struct streaminfo_state state;
848 if ((fsp != NULL) && (fsp->fh->fd != -1)) {
849 ret = SMB_VFS_FSTAT(fsp, &sbuf);
851 ret = vfs_stat_smb_basename(handle->conn,
857 return map_nt_error_from_unix(errno);
860 state.streams = *pstreams;
861 state.num_streams = *pnum_streams;
862 state.mem_ctx = mem_ctx;
863 state.handle = handle;
864 state.status = NT_STATUS_OK;
866 if (S_ISLNK(sbuf.st_ex_mode)) {
868 * Currently we do't have SMB_VFS_LLISTXATTR
869 * inside the VFS which means there's no way
870 * to cope with a symlink when lp_posix_pathnames().
871 * returns true. For now ignore links.
872 * FIXME - by adding SMB_VFS_LLISTXATTR. JRA.
874 status = NT_STATUS_OK;
876 status = walk_xattr_streams(handle, fsp, smb_fname,
877 collect_one_stream, &state);
880 if (!NT_STATUS_IS_OK(status)) {
881 TALLOC_FREE(state.streams);
885 if (!NT_STATUS_IS_OK(state.status)) {
886 TALLOC_FREE(state.streams);
890 *pnum_streams = state.num_streams;
891 *pstreams = state.streams;
893 return SMB_VFS_NEXT_STREAMINFO(handle,
901 static uint32_t streams_xattr_fs_capabilities(struct vfs_handle_struct *handle,
902 enum timestamp_set_resolution *p_ts_res)
904 return SMB_VFS_NEXT_FS_CAPABILITIES(handle, p_ts_res) | FILE_NAMED_STREAMS;
907 static int streams_xattr_connect(vfs_handle_struct *handle,
908 const char *service, const char *user)
910 struct streams_xattr_config *config;
911 const char *default_prefix = SAMBA_XATTR_DOSSTREAM_PREFIX;
915 rc = SMB_VFS_NEXT_CONNECT(handle, service, user);
920 config = talloc_zero(handle->conn, struct streams_xattr_config);
921 if (config == NULL) {
922 DEBUG(1, ("talloc_zero() failed\n"));
927 prefix = lp_parm_const_string(SNUM(handle->conn),
928 "streams_xattr", "prefix",
930 config->prefix = talloc_strdup(config, prefix);
931 if (config->prefix == NULL) {
932 DEBUG(1, ("talloc_strdup() failed\n"));
936 config->prefix_len = strlen(config->prefix);
937 DEBUG(10, ("streams_xattr using stream prefix: %s\n", config->prefix));
939 config->store_stream_type = lp_parm_bool(SNUM(handle->conn),
944 SMB_VFS_HANDLE_SET_DATA(handle, config,
945 NULL, struct stream_xattr_config,
951 static ssize_t streams_xattr_pwrite(vfs_handle_struct *handle,
952 files_struct *fsp, const void *data,
953 size_t n, off_t offset)
955 struct stream_io *sio =
956 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
961 DEBUG(10, ("streams_xattr_pwrite called for %d bytes\n", (int)n));
964 return SMB_VFS_NEXT_PWRITE(handle, fsp, data, n, offset);
967 if (!streams_xattr_recheck(sio)) {
971 status = get_ea_value(talloc_tos(), handle->conn, fsp->base_fsp,
972 sio->base, sio->xattr_name, &ea);
973 if (!NT_STATUS_IS_OK(status)) {
977 if ((offset + n) > ea.value.length-1) {
980 tmp = talloc_realloc(talloc_tos(), ea.value.data, uint8_t,
984 TALLOC_FREE(ea.value.data);
989 ea.value.length = offset + n + 1;
990 ea.value.data[offset+n] = 0;
993 memcpy(ea.value.data + offset, data, n);
995 if (fsp->base_fsp->fh->fd != -1) {
996 ret = SMB_VFS_FSETXATTR(fsp->base_fsp,
998 ea.value.data, ea.value.length, 0);
1000 ret = SMB_VFS_SETXATTR(fsp->conn,
1001 fsp->base_fsp->fsp_name->base_name,
1003 ea.value.data, ea.value.length, 0);
1005 TALLOC_FREE(ea.value.data);
1014 static ssize_t streams_xattr_pread(vfs_handle_struct *handle,
1015 files_struct *fsp, void *data,
1016 size_t n, off_t offset)
1018 struct stream_io *sio =
1019 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1020 struct ea_struct ea;
1022 size_t length, overlap;
1024 DEBUG(10, ("streams_xattr_pread: offset=%d, size=%d\n",
1025 (int)offset, (int)n));
1028 return SMB_VFS_NEXT_PREAD(handle, fsp, data, n, offset);
1031 if (!streams_xattr_recheck(sio)) {
1035 status = get_ea_value(talloc_tos(), handle->conn, fsp->base_fsp,
1036 sio->base, sio->xattr_name, &ea);
1037 if (!NT_STATUS_IS_OK(status)) {
1041 length = ea.value.length-1;
1043 DEBUG(10, ("streams_xattr_pread: get_ea_value returned %d bytes\n",
1046 /* Attempt to read past EOF. */
1047 if (length <= offset) {
1051 overlap = (offset + n) > length ? (length - offset) : n;
1052 memcpy(data, ea.value.data + offset, overlap);
1054 TALLOC_FREE(ea.value.data);
1058 static int streams_xattr_ftruncate(struct vfs_handle_struct *handle,
1059 struct files_struct *fsp,
1064 struct ea_struct ea;
1066 struct stream_io *sio =
1067 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1069 DEBUG(10, ("streams_xattr_ftruncate called for file %s offset %.0f\n",
1070 fsp_str_dbg(fsp), (double)offset));
1073 return SMB_VFS_NEXT_FTRUNCATE(handle, fsp, offset);
1076 if (!streams_xattr_recheck(sio)) {
1080 status = get_ea_value(talloc_tos(), handle->conn, fsp->base_fsp,
1081 sio->base, sio->xattr_name, &ea);
1082 if (!NT_STATUS_IS_OK(status)) {
1086 tmp = talloc_realloc(talloc_tos(), ea.value.data, uint8_t,
1090 TALLOC_FREE(ea.value.data);
1095 /* Did we expand ? */
1096 if (ea.value.length < offset + 1) {
1097 memset(&tmp[ea.value.length], '\0',
1098 offset + 1 - ea.value.length);
1101 ea.value.data = tmp;
1102 ea.value.length = offset + 1;
1103 ea.value.data[offset] = 0;
1105 if (fsp->base_fsp->fh->fd != -1) {
1106 ret = SMB_VFS_FSETXATTR(fsp->base_fsp,
1108 ea.value.data, ea.value.length, 0);
1110 ret = SMB_VFS_SETXATTR(fsp->conn,
1111 fsp->base_fsp->fsp_name->base_name,
1113 ea.value.data, ea.value.length, 0);
1116 TALLOC_FREE(ea.value.data);
1125 static int streams_xattr_fallocate(struct vfs_handle_struct *handle,
1126 struct files_struct *fsp,
1131 struct stream_io *sio =
1132 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1134 DEBUG(10, ("streams_xattr_fallocate called for file %s offset %.0f"
1136 fsp_str_dbg(fsp), (double)offset, (double)len));
1139 return SMB_VFS_NEXT_FALLOCATE(handle, fsp, mode, offset, len);
1142 if (!streams_xattr_recheck(sio)) {
1146 /* Let the pwrite code path handle it. */
1152 static struct vfs_fn_pointers vfs_streams_xattr_fns = {
1153 .fs_capabilities_fn = streams_xattr_fs_capabilities,
1154 .connect_fn = streams_xattr_connect,
1155 .open_fn = streams_xattr_open,
1156 .stat_fn = streams_xattr_stat,
1157 .fstat_fn = streams_xattr_fstat,
1158 .lstat_fn = streams_xattr_lstat,
1159 .pread_fn = streams_xattr_pread,
1160 .pwrite_fn = streams_xattr_pwrite,
1161 .unlink_fn = streams_xattr_unlink,
1162 .rename_fn = streams_xattr_rename,
1163 .ftruncate_fn = streams_xattr_ftruncate,
1164 .fallocate_fn = streams_xattr_fallocate,
1165 .streaminfo_fn = streams_xattr_streaminfo,
1168 NTSTATUS vfs_streams_xattr_init(void);
1169 NTSTATUS vfs_streams_xattr_init(void)
1171 return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "streams_xattr",
1172 &vfs_streams_xattr_fns);