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samba-mirror/source3/modules/onefs_streams.c

782 lines
19 KiB
C

/*
* Unix SMB/CIFS implementation.
*
* Support for OneFS Alternate Data Streams
*
* Copyright (C) Tim Prouty, 2008
*
* 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"
#include "onefs.h"
#include "onefs_config.h"
#include <sys/isi_enc.h>
NTSTATUS onefs_stream_prep_smb_fname(TALLOC_CTX *ctx,
const struct smb_filename *smb_fname_in,
struct smb_filename **smb_fname_out)
{
char *stream_name = NULL;
NTSTATUS status;
/*
* Only attempt to strip off the trailing :$DATA if there is an actual
* stream there. If it is the default stream, the smb_fname_out will
* just have a NULL stream so the base file is opened.
*/
if (smb_fname_in->stream_name &&
!is_ntfs_default_stream_smb_fname(smb_fname_in)) {
char *str_tmp = smb_fname_in->stream_name;
/* First strip off the leading ':' */
if (str_tmp[0] == ':') {
str_tmp++;
}
/* Create a new copy of the stream_name. */
stream_name = talloc_strdup(ctx, str_tmp);
if (stream_name == NULL) {
return NT_STATUS_NO_MEMORY;
}
/* Strip off the :$DATA if one exists. */
str_tmp = strrchr_m(stream_name, ':');
if (str_tmp) {
if (StrCaseCmp(str_tmp, ":$DATA") != 0) {
return NT_STATUS_INVALID_PARAMETER;
}
str_tmp[0] = '\0';
}
}
/*
* If there was a stream that wasn't the default stream the leading
* colon and trailing :$DATA has now been stripped off. Create a new
* smb_filename to pass back.
*/
status = create_synthetic_smb_fname(ctx, smb_fname_in->base_name,
stream_name, &smb_fname_in->st,
smb_fname_out);
TALLOC_FREE(stream_name);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(5, ("Failed to prep stream name for %s: %s\n",
*smb_fname_out ?
smb_fname_str_dbg(*smb_fname_out) : "NULL",
nt_errstr(status)));
}
return status;
}
int onefs_close(vfs_handle_struct *handle, struct files_struct *fsp)
{
int ret2, ret = 0;
if (fsp->base_fsp) {
ret = SMB_VFS_NEXT_CLOSE(handle, fsp->base_fsp);
}
ret2 = SMB_VFS_NEXT_CLOSE(handle, fsp);
return ret ? ret : ret2;
}
/*
* Get the ADS directory fd for a file.
*/
static int get_stream_dir_fd(connection_struct *conn, const char *base,
int *base_fdp)
{
int base_fd;
int dir_fd;
int saved_errno;
DEBUG(10, ("Getting stream directory fd: %s (%d)\n", base,
base_fdp ? *base_fdp : -1));
/* If a valid base_fdp was given, use it. */
if (base_fdp && *base_fdp >= 0) {
base_fd = *base_fdp;
} else {
base_fd = onefs_sys_create_file(conn,
-1,
base,
0,
0,
0,
0,
0,
0,
INTERNAL_OPEN_ONLY,
0,
NULL,
0,
NULL);
if (base_fd < 0) {
DEBUG(5, ("Failed getting base fd: %s\n",
strerror(errno)));
return -1;
}
}
/* Open the ADS directory. */
dir_fd = onefs_sys_create_file(conn,
base_fd,
".",
0,
FILE_READ_DATA,
0,
0,
0,
0,
INTERNAL_OPEN_ONLY,
0,
NULL,
0,
NULL);
/* Close base_fd if it's not need or on error. */
if (!base_fdp || dir_fd < 0) {
saved_errno = errno;
close(base_fd);
errno = saved_errno;
}
/* Set the out base_fdp if successful and it was requested. */
if (base_fdp && dir_fd >= 0) {
*base_fdp = base_fd;
}
if (dir_fd < 0) {
DEBUG(5, ("Failed getting stream directory fd: %s\n",
strerror(errno)));
}
return dir_fd;
}
int onefs_rename(vfs_handle_struct *handle,
const struct smb_filename *smb_fname_src,
const struct smb_filename *smb_fname_dst)
{
struct smb_filename *smb_fname_src_onefs = NULL;
struct smb_filename *smb_fname_dst_onefs = NULL;
NTSTATUS status;
int saved_errno;
int dir_fd = -1;
int ret = -1;
START_PROFILE(syscall_rename_at);
if (!is_ntfs_stream_smb_fname(smb_fname_src) &&
!is_ntfs_stream_smb_fname(smb_fname_dst)) {
ret = SMB_VFS_NEXT_RENAME(handle, smb_fname_src,
smb_fname_dst);
goto done;
}
/* For now don't allow renames from or to the default stream. */
if (is_ntfs_default_stream_smb_fname(smb_fname_src) ||
is_ntfs_default_stream_smb_fname(smb_fname_dst)) {
DEBUG(3, ("Unable to rename to/from a default stream: %s -> "
"%s\n", smb_fname_str_dbg(smb_fname_src),
smb_fname_str_dbg(smb_fname_dst)));
errno = ENOSYS;
goto done;
}
/* prep stream smb_filename structs. */
status = onefs_stream_prep_smb_fname(talloc_tos(), smb_fname_src,
&smb_fname_src_onefs);
if (!NT_STATUS_IS_OK(status)) {
errno = map_errno_from_nt_status(status);
goto done;
}
status = onefs_stream_prep_smb_fname(talloc_tos(), smb_fname_dst,
&smb_fname_dst_onefs);
if (!NT_STATUS_IS_OK(status)) {
errno = map_errno_from_nt_status(status);
goto done;
}
dir_fd = get_stream_dir_fd(handle->conn, smb_fname_src->base_name,
NULL);
if (dir_fd < -1) {
goto done;
}
DEBUG(8, ("onefs_rename called for %s => %s\n",
smb_fname_str_dbg(smb_fname_src_onefs),
smb_fname_str_dbg(smb_fname_dst_onefs)));
/* Handle rename of stream to default stream specially. */
if (smb_fname_dst_onefs->stream_name == NULL) {
ret = enc_renameat(dir_fd, smb_fname_src_onefs->stream_name,
ENC_DEFAULT, AT_FDCWD,
smb_fname_dst_onefs->base_name,
ENC_DEFAULT);
} else {
ret = enc_renameat(dir_fd, smb_fname_src_onefs->stream_name,
ENC_DEFAULT, dir_fd,
smb_fname_dst_onefs->stream_name,
ENC_DEFAULT);
}
done:
END_PROFILE(syscall_rename_at);
TALLOC_FREE(smb_fname_src_onefs);
TALLOC_FREE(smb_fname_dst_onefs);
saved_errno = errno;
if (dir_fd >= 0) {
close(dir_fd);
}
errno = saved_errno;
return ret;
}
/*
* Merge a base file's sbuf into the a streams's sbuf.
*/
static void merge_stat(SMB_STRUCT_STAT *stream_sbuf,
const SMB_STRUCT_STAT *base_sbuf)
{
int dos_flags = (UF_DOS_NOINDEX | UF_DOS_ARCHIVE |
UF_DOS_HIDDEN | UF_DOS_RO | UF_DOS_SYSTEM);
stream_sbuf->st_ex_mtime = base_sbuf->st_ex_mtime;
stream_sbuf->st_ex_ctime = base_sbuf->st_ex_ctime;
stream_sbuf->st_ex_atime = base_sbuf->st_ex_atime;
stream_sbuf->st_ex_flags &= ~dos_flags;
stream_sbuf->st_ex_flags |= base_sbuf->st_ex_flags & dos_flags;
}
/* fake timestamps */
static void onefs_adjust_stat_time(struct connection_struct *conn,
const char *fname, SMB_STRUCT_STAT *sbuf)
{
struct onefs_vfs_share_config cfg;
struct timeval tv_now = {0, 0};
bool static_mtime = False;
bool static_atime = False;
if (!onefs_get_config(SNUM(conn),
ONEFS_VFS_CONFIG_FAKETIMESTAMPS, &cfg)) {
return;
}
if (IS_MTIME_STATIC_PATH(conn, &cfg, fname)) {
sbuf->st_ex_mtime = sbuf->st_ex_btime;
static_mtime = True;
}
if (IS_ATIME_STATIC_PATH(conn, &cfg, fname)) {
sbuf->st_ex_atime = sbuf->st_ex_btime;
static_atime = True;
}
if (IS_CTIME_NOW_PATH(conn, &cfg, fname)) {
if (cfg.ctime_slop < 0) {
sbuf->st_ex_btime.tv_sec = INT_MAX - 1;
} else {
GetTimeOfDay(&tv_now);
sbuf->st_ex_btime.tv_sec = tv_now.tv_sec +
cfg.ctime_slop;
}
}
if (!static_mtime && IS_MTIME_NOW_PATH(conn,&cfg,fname)) {
if (cfg.mtime_slop < 0) {
sbuf->st_ex_mtime.tv_sec = INT_MAX - 1;
} else {
if (tv_now.tv_sec == 0)
GetTimeOfDay(&tv_now);
sbuf->st_ex_mtime.tv_sec = tv_now.tv_sec +
cfg.mtime_slop;
}
}
if (!static_atime && IS_ATIME_NOW_PATH(conn,&cfg,fname)) {
if (cfg.atime_slop < 0) {
sbuf->st_ex_atime.tv_sec = INT_MAX - 1;
} else {
if (tv_now.tv_sec == 0)
GetTimeOfDay(&tv_now);
sbuf->st_ex_atime.tv_sec = tv_now.tv_sec +
cfg.atime_slop;
}
}
}
static int stat_stream(struct connection_struct *conn, const char *base,
const char *stream, SMB_STRUCT_STAT *sbuf, int flags)
{
SMB_STRUCT_STAT base_sbuf;
int base_fd = -1, dir_fd, ret, saved_errno;
dir_fd = get_stream_dir_fd(conn, base, &base_fd);
if (dir_fd < 0) {
return -1;
}
/* Stat the stream. */
ret = onefs_sys_fstat_at(dir_fd, stream, sbuf, flags);
if (ret != -1) {
DEBUG(10, ("stat of stream '%s' failed: %s\n", stream,
strerror(errno)));
} else {
/* Now stat the base file and merge the results. */
ret = onefs_sys_fstat(base_fd, &base_sbuf);
if (ret != -1) {
merge_stat(sbuf, &base_sbuf);
}
}
saved_errno = errno;
close(dir_fd);
close(base_fd);
errno = saved_errno;
return ret;
}
int onefs_stat(vfs_handle_struct *handle, struct smb_filename *smb_fname)
{
struct smb_filename *smb_fname_onefs = NULL;
NTSTATUS status;
int ret;
status = onefs_stream_prep_smb_fname(talloc_tos(), smb_fname,
&smb_fname_onefs);
if (!NT_STATUS_IS_OK(status)) {
errno = map_errno_from_nt_status(status);
return -1;
}
/*
* If the smb_fname has no stream or is :$DATA, then just stat the
* base stream. Otherwise stat the stream.
*/
if (!is_ntfs_stream_smb_fname(smb_fname_onefs)) {
ret = onefs_sys_stat(smb_fname_onefs->base_name,
&smb_fname->st);
} else {
ret = stat_stream(handle->conn, smb_fname_onefs->base_name,
smb_fname_onefs->stream_name, &smb_fname->st,
0);
}
onefs_adjust_stat_time(handle->conn, smb_fname->base_name,
&smb_fname->st);
TALLOC_FREE(smb_fname_onefs);
return ret;
}
int onefs_fstat(vfs_handle_struct *handle, struct files_struct *fsp,
SMB_STRUCT_STAT *sbuf)
{
SMB_STRUCT_STAT base_sbuf;
int ret;
/* Stat the stream, by calling next_fstat on the stream's fd. */
ret = onefs_sys_fstat(fsp->fh->fd, sbuf);
if (ret == -1) {
return ret;
}
/* Stat the base file and merge the results. */
if (fsp != NULL && fsp->base_fsp != NULL) {
ret = onefs_sys_fstat(fsp->base_fsp->fh->fd, &base_sbuf);
if (ret != -1) {
merge_stat(sbuf, &base_sbuf);
}
}
onefs_adjust_stat_time(handle->conn, fsp->fsp_name->base_name, sbuf);
return ret;
}
int onefs_lstat(vfs_handle_struct *handle, struct smb_filename *smb_fname)
{
struct smb_filename *smb_fname_onefs = NULL;
NTSTATUS status;
int ret;
status = onefs_stream_prep_smb_fname(talloc_tos(), smb_fname,
&smb_fname_onefs);
if (!NT_STATUS_IS_OK(status)) {
errno = map_errno_from_nt_status(status);
return -1;
}
/*
* If the smb_fname has no stream or is :$DATA, then just stat the
* base stream. Otherwise stat the stream.
*/
if (!is_ntfs_stream_smb_fname(smb_fname_onefs)) {
ret = onefs_sys_lstat(smb_fname_onefs->base_name,
&smb_fname->st);
} else {
ret = stat_stream(handle->conn, smb_fname_onefs->base_name,
smb_fname_onefs->stream_name, &smb_fname->st,
AT_SYMLINK_NOFOLLOW);
}
onefs_adjust_stat_time(handle->conn, smb_fname->base_name,
&smb_fname->st);
TALLOC_FREE(smb_fname_onefs);
return ret;
}
int onefs_unlink(vfs_handle_struct *handle,
const struct smb_filename *smb_fname)
{
struct smb_filename *smb_fname_onefs = NULL;
int ret;
int dir_fd, saved_errno;
NTSTATUS status;
/* Not a stream. */
if (!is_ntfs_stream_smb_fname(smb_fname)) {
return SMB_VFS_NEXT_UNLINK(handle, smb_fname);
}
status = onefs_stream_prep_smb_fname(talloc_tos(), smb_fname,
&smb_fname_onefs);
if (!NT_STATUS_IS_OK(status)) {
errno = map_errno_from_nt_status(status);
return -1;
}
/* Default stream (the ::$DATA was just stripped off). */
if (!is_ntfs_stream_smb_fname(smb_fname_onefs)) {
ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname_onefs);
goto out;
}
dir_fd = get_stream_dir_fd(handle->conn, smb_fname_onefs->base_name,
NULL);
if (dir_fd < 0) {
ret = -1;
goto out;
}
ret = enc_unlinkat(dir_fd, smb_fname_onefs->stream_name, ENC_DEFAULT,
0);
saved_errno = errno;
close(dir_fd);
errno = saved_errno;
out:
TALLOC_FREE(smb_fname_onefs);
return ret;
}
int onefs_vtimes_streams(vfs_handle_struct *handle,
const struct smb_filename *smb_fname,
int flags, struct timespec times[3])
{
struct smb_filename *smb_fname_onefs = NULL;
int ret;
int dirfd;
int saved_errno;
NTSTATUS status;
START_PROFILE(syscall_ntimes);
if (!is_ntfs_stream_smb_fname(smb_fname)) {
ret = vtimes(smb_fname->base_name, times, flags);
return ret;
}
status = onefs_stream_prep_smb_fname(talloc_tos(), smb_fname,
&smb_fname_onefs);
if (!NT_STATUS_IS_OK(status)) {
errno = map_errno_from_nt_status(status);
return -1;
}
/* Default stream (the ::$DATA was just stripped off). */
if (!is_ntfs_stream_smb_fname(smb_fname_onefs)) {
ret = vtimes(smb_fname_onefs->base_name, times, flags);
goto out;
}
dirfd = get_stream_dir_fd(handle->conn, smb_fname->base_name, NULL);
if (dirfd < -1) {
ret = -1;
goto out;
}
ret = enc_vtimesat(dirfd, smb_fname_onefs->stream_name, ENC_DEFAULT,
times, flags);
saved_errno = errno;
close(dirfd);
errno = saved_errno;
out:
END_PROFILE(syscall_ntimes);
TALLOC_FREE(smb_fname_onefs);
return ret;
}
/*
* Streaminfo enumeration functionality
*/
struct streaminfo_state {
TALLOC_CTX *mem_ctx;
vfs_handle_struct *handle;
unsigned int num_streams;
struct stream_struct *streams;
NTSTATUS status;
};
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_asprintf(mem_ctx, ":%s:%s", name,
"$DATA");
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;
}
static NTSTATUS walk_onefs_streams(connection_struct *conn, files_struct *fsp,
const char *fname,
struct streaminfo_state *state,
SMB_STRUCT_STAT *base_sbuf)
{
NTSTATUS status = NT_STATUS_OK;
bool opened_base_fd = false;
int base_fd = -1;
int dir_fd = -1;
int stream_fd = -1;
int ret;
SMB_STRUCT_DIR *dirp = NULL;
SMB_STRUCT_DIRENT *dp = NULL;
files_struct fake_fs;
struct fd_handle fake_fh;
SMB_STRUCT_STAT stream_sbuf;
ZERO_STRUCT(fake_fh);
ZERO_STRUCT(fake_fs);
/* If the base file is already open, use its fd. */
if ((fsp != NULL) && (fsp->fh->fd != -1)) {
base_fd = fsp->fh->fd;
} else {
opened_base_fd = true;
}
dir_fd = get_stream_dir_fd(conn, fname, &base_fd);
if (dir_fd < 0) {
return map_nt_error_from_unix(errno);
}
/* Open the ADS directory. */
if ((dirp = fdopendir(dir_fd)) == NULL) {
DEBUG(0, ("Error on opendir %s. errno=%d (%s)\n",
fname, errno, strerror(errno)));
status = map_nt_error_from_unix(errno);
goto out;
}
/* Initialize the dir state struct and add it to the list.
* This is a layer violation, and really should be handled by a
* VFS_FDOPENDIR() call which would properly setup the dir state.
* But since this is all within the onefs.so module, we cheat for
* now and call directly into the readdirplus code.
* NOTE: This state MUST be freed by a proper VFS_CLOSEDIR() call. */
ret = onefs_rdp_add_dir_state(conn, dirp);
if (ret) {
DEBUG(0, ("Error adding dir_state to the list\n"));
status = map_nt_error_from_unix(errno);
goto out;
}
fake_fs.conn = conn;
fake_fs.fh = &fake_fh;
status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
&fake_fs.fsp_name);
if (!NT_STATUS_IS_OK(status)) {
goto out;
}
/* Iterate over the streams in the ADS directory. */
while ((dp = SMB_VFS_READDIR(conn, dirp, NULL)) != NULL) {
/* Skip the "." and ".." entries */
if ((strcmp(dp->d_name, ".") == 0) ||
(strcmp(dp->d_name, "..") == 0))
continue;
/* Open actual stream */
if ((stream_fd = onefs_sys_create_file(conn,
base_fd,
dp->d_name,
0,
0,
0,
0,
0,
0,
INTERNAL_OPEN_ONLY,
0,
NULL,
0,
NULL)) == -1) {
DEBUG(0, ("Error opening stream %s:%s. "
"errno=%d (%s)\n", fname, dp->d_name, errno,
strerror(errno)));
continue;
}
/* Figure out the stat info. */
fake_fh.fd = stream_fd;
ret = SMB_VFS_FSTAT(&fake_fs, &stream_sbuf);
close(stream_fd);
if (ret) {
DEBUG(0, ("Error fstating stream %s:%s. "
"errno=%d (%s)\n", fname, dp->d_name, errno,
strerror(errno)));
continue;
}
merge_stat(&stream_sbuf, base_sbuf);
if (!add_one_stream(state->mem_ctx,
&state->num_streams, &state->streams,
dp->d_name, stream_sbuf.st_ex_size,
SMB_VFS_GET_ALLOC_SIZE(conn, NULL,
&stream_sbuf))) {
state->status = NT_STATUS_NO_MEMORY;
break;
}
}
out:
/* Cleanup everything that was opened. */
if (dirp != NULL) {
SMB_VFS_CLOSEDIR(conn, dirp);
}
if (dir_fd >= 0) {
close(dir_fd);
}
if (opened_base_fd) {
SMB_ASSERT(base_fd >= 0);
close(base_fd);
}
TALLOC_FREE(fake_fs.fsp_name);
return status;
}
NTSTATUS onefs_streaminfo(vfs_handle_struct *handle,
struct files_struct *fsp,
const char *fname,
TALLOC_CTX *mem_ctx,
unsigned int *num_streams,
struct stream_struct **streams)
{
SMB_STRUCT_STAT sbuf;
int ret;
NTSTATUS status;
struct streaminfo_state state;
/* Get a valid stat. */
if ((fsp != NULL) && (fsp->fh->fd != -1)) {
ret = SMB_VFS_FSTAT(fsp, &sbuf);
} else {
struct smb_filename *smb_fname = NULL;
status = create_synthetic_smb_fname(talloc_tos(), fname, NULL,
NULL, &smb_fname);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
ret = SMB_VFS_STAT(handle->conn, smb_fname);
sbuf = smb_fname->st;
TALLOC_FREE(smb_fname);
}
if (ret == -1) {
return map_nt_error_from_unix(errno);
}
state.streams = NULL;
state.num_streams = 0;
if (lp_parm_bool(SNUM(handle->conn), PARM_ONEFS_TYPE,
PARM_IGNORE_STREAMS, PARM_IGNORE_STREAMS_DEFAULT)) {
goto out;
}
/* Add the default stream. */
if (S_ISREG(sbuf.st_ex_mode)) {
if (!add_one_stream(mem_ctx,
&state.num_streams, &state.streams,
"", sbuf.st_ex_size,
SMB_VFS_GET_ALLOC_SIZE(handle->conn, fsp,
&sbuf))) {
return NT_STATUS_NO_MEMORY;
}
}
state.mem_ctx = mem_ctx;
state.handle = handle;
state.status = NT_STATUS_OK;
/* If there are more streams, add them too. */
if (sbuf.st_ex_flags & UF_HASADS) {
status = walk_onefs_streams(handle->conn, fsp, fname,
&state, &sbuf);
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;
}
}
out:
*num_streams = state.num_streams;
*streams = state.streams;
return NT_STATUS_OK;
}