--- /dev/null
+/*
+ * Store streams in xattrs
+ *
+ * Copyright (C) Volker Lendecke, 2008
+ *
+ * Partly based on James Peach's Darwin module, which is
+ *
+ * Copyright (C) James Peach 2006-2007
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "includes.h"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_VFS
+
+#define XATTR_DOSSTREAM_PREFIX "user.DosStream."
+
+struct stream_io {
+ char *base;
+ char *xattr_name;
+};
+
+static SMB_INO_T stream_inode(const SMB_STRUCT_STAT *sbuf, const char *sname)
+{
+ struct MD5Context ctx;
+ unsigned char hash[16];
+ SMB_INO_T result;
+ char *upper_sname;
+
+ DEBUG(10, ("stream_inode called for %lu/%lu [%s]\n",
+ (unsigned long)sbuf->st_dev,
+ (unsigned long)sbuf->st_ino, sname));
+
+ upper_sname = talloc_strdup_upper(talloc_tos(), sname);
+ SMB_ASSERT(upper_sname != NULL);
+
+ MD5Init(&ctx);
+ MD5Update(&ctx, (unsigned char *)&(sbuf->st_dev),
+ sizeof(sbuf->st_dev));
+ MD5Update(&ctx, (unsigned char *)&(sbuf->st_ino),
+ sizeof(sbuf->st_ino));
+ MD5Update(&ctx, (unsigned char *)upper_sname,
+ talloc_get_size(upper_sname)-1);
+ MD5Final(hash, &ctx);
+
+ TALLOC_FREE(upper_sname);
+
+ /* Hopefully all the variation is in the lower 4 (or 8) bytes! */
+ memcpy(&result, hash, sizeof(result));
+
+ DEBUG(10, ("stream_inode returns %lu\n", (unsigned long)result));
+
+ return result;
+}
+
+static ssize_t get_xattr_size(connection_struct *conn, const char *fname,
+ const char *xattr_name)
+{
+ NTSTATUS status;
+ struct ea_struct ea;
+ ssize_t result;
+
+ status = get_ea_value(talloc_tos(), conn, NULL, fname,
+ xattr_name, &ea);
+
+ if (!NT_STATUS_IS_OK(status)) {
+ return -1;
+ }
+
+ result = ea.value.length-1;
+ TALLOC_FREE(ea.value.data);
+ return result;
+}
+
+
+static int streams_xattr_fstat(vfs_handle_struct *handle, files_struct *fsp,
+ SMB_STRUCT_STAT *sbuf)
+{
+ struct stream_io *io = (struct stream_io *)
+ VFS_FETCH_FSP_EXTENSION(handle, fsp);
+
+ if (io == NULL) {
+ return SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
+ }
+
+ if (SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf) == -1) {
+ return -1;
+ }
+
+ sbuf->st_size = get_xattr_size(handle->conn, io->base, io->xattr_name);
+ if (sbuf->st_size == -1) {
+ return -1;
+ }
+
+ sbuf->st_ino = stream_inode(sbuf, io->xattr_name);
+ sbuf->st_mode &= ~S_IFMT;
+ sbuf->st_mode |= S_IFREG;
+ sbuf->st_blocks = sbuf->st_size % STAT_ST_BLOCKSIZE + 1;
+
+ return 0;
+}
+
+static int streams_xattr_stat(vfs_handle_struct *handle, const char *fname,
+ SMB_STRUCT_STAT *sbuf)
+{
+ NTSTATUS status;
+ char *base, *sname;
+ int result = -1;
+ char *xattr_name;
+
+ if (!is_ntfs_stream_name(fname)) {
+ return SMB_VFS_NEXT_STAT(handle, fname, sbuf);
+ }
+
+ status = split_ntfs_stream_name(talloc_tos(), fname, &base, &sname);
+ if (!NT_STATUS_IS_OK(status)) {
+ errno = EINVAL;
+ goto fail;
+ }
+
+ if (SMB_VFS_NEXT_STAT(handle, base, sbuf) == -1) {
+ goto fail;
+ }
+
+ xattr_name = talloc_asprintf(talloc_tos(), "%s%s",
+ XATTR_DOSSTREAM_PREFIX, sname);
+ if (xattr_name == NULL) {
+ errno = ENOMEM;
+ goto fail;
+ }
+
+ sbuf->st_size = get_xattr_size(handle->conn, base, xattr_name);
+ if (sbuf->st_size == -1) {
+ errno = ENOENT;
+ goto fail;
+ }
+
+ sbuf->st_ino = stream_inode(sbuf, xattr_name);
+ sbuf->st_mode &= ~S_IFMT;
+ sbuf->st_mode |= S_IFREG;
+ sbuf->st_blocks = sbuf->st_size % STAT_ST_BLOCKSIZE + 1;
+
+ result = 0;
+ fail:
+ TALLOC_FREE(base);
+ TALLOC_FREE(sname);
+ return result;
+}
+
+static int streams_xattr_lstat(vfs_handle_struct *handle, const char *fname,
+ SMB_STRUCT_STAT *sbuf)
+{
+ NTSTATUS status;
+ char *base, *sname;
+ int result = -1;
+ char *xattr_name;
+
+ if (!is_ntfs_stream_name(fname)) {
+ return SMB_VFS_NEXT_LSTAT(handle, fname, sbuf);
+ }
+
+ status = split_ntfs_stream_name(talloc_tos(), fname, &base, &sname);
+ if (!NT_STATUS_IS_OK(status)) {
+ errno = EINVAL;
+ goto fail;
+ }
+
+ if (SMB_VFS_NEXT_LSTAT(handle, base, sbuf) == -1) {
+ goto fail;
+ }
+
+ xattr_name = talloc_asprintf(talloc_tos(), "%s%s",
+ XATTR_DOSSTREAM_PREFIX, sname);
+ if (xattr_name == NULL) {
+ errno = ENOMEM;
+ goto fail;
+ }
+
+ sbuf->st_size = get_xattr_size(handle->conn, base, xattr_name);
+ if (sbuf->st_size == -1) {
+ errno = ENOENT;
+ goto fail;
+ }
+
+ sbuf->st_ino = stream_inode(sbuf, xattr_name);
+ sbuf->st_mode &= ~S_IFMT;
+ sbuf->st_mode |= S_IFREG;
+ sbuf->st_blocks = sbuf->st_size % STAT_ST_BLOCKSIZE + 1;
+
+ result = 0;
+ fail:
+ TALLOC_FREE(base);
+ TALLOC_FREE(sname);
+ return result;
+}
+
+static int streams_xattr_open(vfs_handle_struct *handle, const char *fname,
+ files_struct *fsp, int flags, mode_t mode)
+{
+ TALLOC_CTX *frame;
+ NTSTATUS status;
+ struct stream_io *sio;
+ char *base, *sname;
+ struct ea_struct ea;
+ char *xattr_name;
+ int baseflags;
+ int hostfd = -1;
+
+ if (!is_ntfs_stream_name(fname)) {
+ return SMB_VFS_NEXT_OPEN(handle, fname, fsp, flags, mode);
+ }
+
+ frame = talloc_stackframe();
+
+ status = split_ntfs_stream_name(talloc_tos(), fname,
+ &base, &sname);
+ if (!NT_STATUS_IS_OK(status)) {
+ errno = EINVAL;
+ goto fail;
+ }
+
+ xattr_name = talloc_asprintf(talloc_tos(), "%s%s",
+ XATTR_DOSSTREAM_PREFIX, sname);
+ if (xattr_name == NULL) {
+ errno = ENOMEM;
+ goto fail;
+ }
+
+ /*
+ * We use baseflags to turn off nasty side-effects when opening the
+ * underlying file.
+ */
+ baseflags = flags;
+ baseflags &= ~O_TRUNC;
+ baseflags &= ~O_EXCL;
+ baseflags &= ~O_CREAT;
+
+ hostfd = SMB_VFS_NEXT_OPEN(handle, base, fsp, baseflags, mode);
+
+ /* It is legit to open a stream on a directory, but the base
+ * fd has to be read-only.
+ */
+ if ((hostfd == -1) && (errno == EISDIR)) {
+ baseflags &= ~O_ACCMODE;
+ baseflags |= O_RDONLY;
+ hostfd = SMB_VFS_NEXT_OPEN(handle, fname, fsp, baseflags,
+ mode);
+ }
+
+ if (hostfd == -1) {
+ goto fail;
+ }
+
+ status = get_ea_value(talloc_tos(), handle->conn, fsp, base,
+ xattr_name, &ea);
+
+ if (!NT_STATUS_IS_OK(status)
+ && !NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
+ /*
+ * The base file is not there. This is an error even if we got
+ * O_CREAT, the higher levels should have created the base
+ * file for us.
+ */
+ errno = ENOENT;
+ goto fail;
+ }
+
+ if (!NT_STATUS_IS_OK(status)) {
+ /*
+ * The attribute does not exist
+ */
+
+ if (flags & O_CREAT) {
+ /*
+ * Darn, xattrs need at least 1 byte
+ */
+ char null = '\0';
+
+ if (SMB_VFS_NEXT_SETXATTR(
+ handle, base, xattr_name, &null, sizeof(null),
+ flags & O_EXCL ? XATTR_CREATE : 0) == -1) {
+ goto fail;
+ }
+ }
+ }
+
+ if (flags & O_TRUNC) {
+ char null = '\0';
+ if (SMB_VFS_NEXT_SETXATTR(
+ handle, base, xattr_name, &null, sizeof(null),
+ flags & O_EXCL ? XATTR_CREATE : 0) == -1) {
+ goto fail;
+ }
+ }
+
+ sio = (struct stream_io *)VFS_ADD_FSP_EXTENSION(handle, fsp,
+ struct stream_io);
+ if (sio == NULL) {
+ errno = ENOMEM;
+ goto fail;
+ }
+
+ sio->xattr_name = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(handle, fsp),
+ xattr_name);
+ sio->base = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(handle, fsp),
+ base);
+
+ if ((sio->xattr_name == NULL) || (sio->base == NULL)) {
+ errno = ENOMEM;
+ goto fail;
+ }
+
+ TALLOC_FREE(frame);
+ return hostfd;
+
+ fail:
+ if (hostfd >= 0) {
+ /*
+ * BUGBUGBUG -- we would need to call fd_close_posix here, but
+ * we don't have a full fsp yet
+ */
+ SMB_VFS_NEXT_CLOSE(handle, fsp, hostfd);
+ }
+
+ TALLOC_FREE(frame);
+ return -1;
+}
+
+static int streams_xattr_unlink(vfs_handle_struct *handle, const char *fname)
+{
+ NTSTATUS status;
+ char *base = NULL;
+ char *sname = NULL;
+ int ret = -1;
+ char *xattr_name;
+
+ if (!is_ntfs_stream_name(fname)) {
+ return SMB_VFS_NEXT_UNLINK(handle, fname);
+ }
+
+ status = split_ntfs_stream_name(talloc_tos(), fname, &base, &sname);
+ if (!NT_STATUS_IS_OK(status)) {
+ errno = EINVAL;
+ goto fail;
+ }
+
+ xattr_name = talloc_asprintf(talloc_tos(), "%s%s",
+ XATTR_DOSSTREAM_PREFIX, sname);
+ if (xattr_name == NULL) {
+ errno = ENOMEM;
+ goto fail;
+ }
+
+ ret = SMB_VFS_NEXT_REMOVEXATTR(handle, base, xattr_name);
+
+ if ((ret == -1) && (errno == ENOATTR)) {
+ errno = ENOENT;
+ goto fail;
+ }
+
+ ret = 0;
+
+ fail:
+ TALLOC_FREE(base);
+ TALLOC_FREE(sname);
+ return ret;
+}
+
+static NTSTATUS walk_xattr_streams(connection_struct *conn, files_struct *fsp,
+ const char *fname,
+ bool (*fn)(struct ea_struct *ea,
+ void *private_data),
+ void *private_data)
+{
+ NTSTATUS status;
+ char **names;
+ size_t i, num_names;
+ size_t prefix_len = strlen(XATTR_DOSSTREAM_PREFIX);
+
+ status = get_ea_names_from_file(talloc_tos(), conn, fsp, fname,
+ &names, &num_names);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+
+ for (i=0; i<num_names; i++) {
+ struct ea_struct ea;
+
+ if (strncmp(names[i], XATTR_DOSSTREAM_PREFIX,
+ prefix_len) != 0) {
+ continue;
+ }
+
+ status = get_ea_value(names, conn, fsp, fname, names[i], &ea);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(10, ("Could not get ea %s for file %s: %s\n",
+ names[i], fname, nt_errstr(status)));
+ continue;
+ }
+
+ ea.name = talloc_asprintf(ea.value.data, ":%s",
+ names[i] + prefix_len);
+ if (ea.name == NULL) {
+ DEBUG(0, ("talloc failed\n"));
+ continue;
+ }
+
+ if (!fn(&ea, private_data)) {
+ TALLOC_FREE(ea.value.data);
+ return NT_STATUS_OK;
+ }
+
+ TALLOC_FREE(ea.value.data);
+ }
+
+ TALLOC_FREE(names);
+ return NT_STATUS_OK;
+}
+
+static bool add_one_stream(TALLOC_CTX *mem_ctx, unsigned int *num_streams,
+ struct stream_struct **streams,
+ const char *name, SMB_OFF_T size,
+ SMB_OFF_T alloc_size)
+{
+ struct stream_struct *tmp;
+
+ tmp = TALLOC_REALLOC_ARRAY(mem_ctx, *streams, struct stream_struct,
+ (*num_streams)+1);
+ if (tmp == NULL) {
+ return false;
+ }
+
+ tmp[*num_streams].name = talloc_strdup(tmp, name);
+ if (tmp[*num_streams].name == NULL) {
+ return false;
+ }
+
+ tmp[*num_streams].size = size;
+ tmp[*num_streams].alloc_size = alloc_size;
+
+ *streams = tmp;
+ *num_streams += 1;
+ return true;
+}
+
+struct streaminfo_state {
+ TALLOC_CTX *mem_ctx;
+ vfs_handle_struct *handle;
+ unsigned int num_streams;
+ struct stream_struct *streams;
+ NTSTATUS status;
+};
+
+static bool collect_one_stream(struct ea_struct *ea, void *private_data)
+{
+ struct streaminfo_state *state =
+ (struct streaminfo_state *)private_data;
+
+ if (!add_one_stream(state->mem_ctx,
+ &state->num_streams, &state->streams,
+ ea->name, ea->value.length-1,
+ smb_roundup(state->handle->conn,
+ ea->value.length-1))) {
+ state->status = NT_STATUS_NO_MEMORY;
+ return false;
+ }
+
+ return true;
+}
+
+static NTSTATUS streams_xattr_streaminfo(vfs_handle_struct *handle,
+ struct files_struct *fsp,
+ const char *fname,
+ TALLOC_CTX *mem_ctx,
+ unsigned int *pnum_streams,
+ struct stream_struct **pstreams)
+{
+ SMB_STRUCT_STAT sbuf;
+ int ret;
+ NTSTATUS status;
+ struct streaminfo_state state;
+
+ if ((fsp != NULL) && (fsp->fh->fd != -1)) {
+ if (is_ntfs_stream_name(fsp->fsp_name)) {
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+ ret = SMB_VFS_NEXT_FSTAT(handle, fsp, &sbuf);
+ }
+ else {
+ if (is_ntfs_stream_name(fname)) {
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+ ret = SMB_VFS_NEXT_STAT(handle, fname, &sbuf);
+ }
+
+ if (ret == -1) {
+ return map_nt_error_from_unix(errno);
+ }
+
+ state.streams = NULL;
+ state.num_streams = 0;
+
+ if (!S_ISDIR(sbuf.st_mode)) {
+ if (!add_one_stream(mem_ctx,
+ &state.num_streams, &state.streams,
+ "::$DATA", sbuf.st_size,
+ get_allocation_size(handle->conn, fsp,
+ &sbuf))) {
+ return NT_STATUS_NO_MEMORY;
+ }
+ }
+
+ state.mem_ctx = mem_ctx;
+ state.handle = handle;
+ state.status = NT_STATUS_OK;
+
+ status = walk_xattr_streams(handle->conn, fsp, fname,
+ collect_one_stream, &state);
+
+ if (!NT_STATUS_IS_OK(status)) {
+ TALLOC_FREE(state.streams);
+ return status;
+ }
+
+ if (!NT_STATUS_IS_OK(state.status)) {
+ TALLOC_FREE(state.streams);
+ return state.status;
+ }
+
+ *pnum_streams = state.num_streams;
+ *pstreams = state.streams;
+ return NT_STATUS_OK;
+}
+
+static int streams_xattr_statvfs(struct vfs_handle_struct *handle,
+ const char *path,
+ struct vfs_statvfs_struct *statbuf)
+{
+ int ret;
+
+ ret = SMB_VFS_NEXT_STATVFS(handle, path, statbuf);
+ statbuf->FsCapabilities |= FILE_NAMED_STREAMS;
+ return ret;
+
+}
+
+static ssize_t streams_xattr_pwrite(vfs_handle_struct *handle,
+ files_struct *fsp, const void *data,
+ size_t n, SMB_OFF_T offset)
+{
+ struct stream_io *sio =
+ (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
+ struct ea_struct ea;
+ NTSTATUS status;
+ int ret;
+
+ if (sio == NULL) {
+ return SMB_VFS_NEXT_PWRITE(handle, fsp, data, n, offset);
+ }
+
+ status = get_ea_value(talloc_tos(), handle->conn, fsp, sio->base,
+ sio->xattr_name, &ea);
+ if (!NT_STATUS_IS_OK(status)) {
+ return -1;
+ }
+
+ if ((offset + n) > ea.value.length-1) {
+ uint8 *tmp;
+
+ tmp = TALLOC_REALLOC_ARRAY(talloc_tos(), ea.value.data, uint8,
+ offset + n + 1);
+
+ if (tmp == NULL) {
+ TALLOC_FREE(ea.value.data);
+ errno = ENOMEM;
+ return -1;
+ }
+ ea.value.data = tmp;
+ ea.value.length = offset + n + 1;
+ ea.value.data[offset+n] = 0;
+ }
+
+ memcpy(ea.value.data + offset, data, n);
+
+ ret = SMB_VFS_NEXT_FSETXATTR(handle, fsp, sio->xattr_name,
+ ea.value.data, ea.value.length, 0);
+
+ TALLOC_FREE(ea.value.data);
+
+ return n;
+}
+
+static ssize_t streams_xattr_pread(vfs_handle_struct *handle,
+ files_struct *fsp, void *data,
+ size_t n, SMB_OFF_T offset)
+{
+ struct stream_io *sio =
+ (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
+ struct ea_struct ea;
+ NTSTATUS status;
+ size_t length, overlap;
+
+ if (sio == NULL) {
+ return SMB_VFS_NEXT_PREAD(handle, fsp, data, n, offset);
+ }
+
+ status = get_ea_value(talloc_tos(), handle->conn, fsp, sio->base,
+ sio->xattr_name, &ea);
+ if (!NT_STATUS_IS_OK(status)) {
+ return -1;
+ }
+
+ length = ea.value.length-1;
+
+ /* Attempt to read past EOF. */
+ if (length <= offset) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ overlap = (offset + n) > length ? (length - offset) : n;
+ memcpy(data, ea.value.data + offset, overlap);
+
+ TALLOC_FREE(ea.value.data);
+ return overlap;
+}
+
+/* VFS operations structure */
+
+static vfs_op_tuple streams_xattr_ops[] = {
+ {SMB_VFS_OP(streams_xattr_statvfs), SMB_VFS_OP_STATVFS,
+ SMB_VFS_LAYER_TRANSPARENT},
+ {SMB_VFS_OP(streams_xattr_open), SMB_VFS_OP_OPEN,
+ SMB_VFS_LAYER_TRANSPARENT},
+ {SMB_VFS_OP(streams_xattr_stat), SMB_VFS_OP_STAT,
+ SMB_VFS_LAYER_TRANSPARENT},
+ {SMB_VFS_OP(streams_xattr_fstat), SMB_VFS_OP_FSTAT,
+ SMB_VFS_LAYER_TRANSPARENT},
+ {SMB_VFS_OP(streams_xattr_lstat), SMB_VFS_OP_LSTAT,
+ SMB_VFS_LAYER_TRANSPARENT},
+ {SMB_VFS_OP(streams_xattr_pread), SMB_VFS_OP_PREAD,
+ SMB_VFS_LAYER_TRANSPARENT},
+ {SMB_VFS_OP(streams_xattr_pwrite), SMB_VFS_OP_PWRITE,
+ SMB_VFS_LAYER_TRANSPARENT},
+ {SMB_VFS_OP(streams_xattr_lstat), SMB_VFS_OP_LSTAT,
+ SMB_VFS_LAYER_TRANSPARENT},
+ {SMB_VFS_OP(streams_xattr_unlink), SMB_VFS_OP_UNLINK,
+ SMB_VFS_LAYER_TRANSPARENT},
+ {SMB_VFS_OP(streams_xattr_streaminfo), SMB_VFS_OP_STREAMINFO,
+ SMB_VFS_LAYER_OPAQUE},
+ {SMB_VFS_OP(NULL), SMB_VFS_OP_NOOP, SMB_VFS_LAYER_NOOP}
+};
+
+NTSTATUS vfs_streams_xattr_init(void);
+NTSTATUS vfs_streams_xattr_init(void)
+{
+ return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "streams_xattr",
+ streams_xattr_ops);
+}
git.samba.org / amitay / samba.git / commitdiff