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/*
Unix SMB/CIFS implementation.
Core SMB2 server
Copyright (C) Stefan Metzmacher 2009
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 "smbd/smbd.h"
#include "smbd/globals.h"
#include "../libcli/smb/smb_common.h"
#include "../lib/util/tevent_ntstatus.h"
#include "libcli/security/security.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_SMB2
static struct tevent_req *smbd_smb2_flush_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct smbd_smb2_request *smb2req,
struct files_struct *fsp);
static NTSTATUS smbd_smb2_flush_recv(struct tevent_req *req);
static void smbd_smb2_request_flush_done(struct tevent_req *subreq);
NTSTATUS smbd_smb2_request_process_flush(struct smbd_smb2_request *req)
{
NTSTATUS status;
const uint8_t *inbody;
uint64_t in_file_id_persistent;
uint64_t in_file_id_volatile;
struct files_struct *in_fsp;
struct tevent_req *subreq;
status = smbd_smb2_request_verify_sizes(req, 0x18);
if (!NT_STATUS_IS_OK(status)) {
return smbd_smb2_request_error(req, status);
}
inbody = SMBD_SMB2_IN_BODY_PTR(req);
in_file_id_persistent = BVAL(inbody, 0x08);
in_file_id_volatile = BVAL(inbody, 0x10);
in_fsp = file_fsp_smb2(req, in_file_id_persistent, in_file_id_volatile);
if (in_fsp == NULL) {
return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
}
subreq = smbd_smb2_flush_send(req, req->sconn->ev_ctx,
req, in_fsp);
if (subreq == NULL) {
return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
}
tevent_req_set_callback(subreq, smbd_smb2_request_flush_done, req);
return smbd_smb2_request_pending_queue(req, subreq, 500);
}
static void smbd_smb2_request_flush_done(struct tevent_req *subreq)
{
struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
struct smbd_smb2_request);
DATA_BLOB outbody;
NTSTATUS status;
NTSTATUS error; /* transport error */
status = smbd_smb2_flush_recv(subreq);
TALLOC_FREE(subreq);
if (!NT_STATUS_IS_OK(status)) {
error = smbd_smb2_request_error(req, status);
if (!NT_STATUS_IS_OK(error)) {
smbd_server_connection_terminate(req->xconn,
nt_errstr(error));
return;
}
return;
}
outbody = smbd_smb2_generate_outbody(req, 0x04);
if (outbody.data == NULL) {
error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
if (!NT_STATUS_IS_OK(error)) {
smbd_server_connection_terminate(req->xconn,
nt_errstr(error));
return;
}
return;
}
SSVAL(outbody.data, 0x00, 0x04); /* struct size */
SSVAL(outbody.data, 0x02, 0); /* reserved */
error = smbd_smb2_request_done(req, outbody, NULL);
if (!NT_STATUS_IS_OK(error)) {
smbd_server_connection_terminate(req->xconn,
nt_errstr(error));
return;
}
}
struct smbd_smb2_flush_state {
struct smbd_smb2_request *smb2req;
};
static void smbd_smb2_flush_done(struct tevent_req *subreq);
static struct tevent_req *smbd_smb2_flush_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct smbd_smb2_request *smb2req,
struct files_struct *fsp)
{
struct tevent_req *req;
struct tevent_req *subreq;
struct smbd_smb2_flush_state *state;
struct smb_request *smbreq;
int ret;
req = tevent_req_create(mem_ctx, &state,
struct smbd_smb2_flush_state);
if (req == NULL) {
return NULL;
}
state->smb2req = smb2req;
DEBUG(10,("smbd_smb2_flush: %s - %s\n",
fsp_str_dbg(fsp), fsp_fnum_dbg(fsp)));
smbreq = smbd_smb2_fake_smb_request(smb2req);
if (tevent_req_nomem(smbreq, req)) {
return tevent_req_post(req, ev);
}
if (IS_IPC(smbreq->conn)) {
tevent_req_nterror(req, NT_STATUS_NOT_IMPLEMENTED);
return tevent_req_post(req, ev);
}
if (!CHECK_WRITE(fsp)) {
bool allow_dir_flush = false;
uint32_t flush_access = FILE_ADD_FILE | FILE_ADD_SUBDIRECTORY;
if (!fsp->is_directory) {
tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
return tevent_req_post(req, ev);
}
/*
* Directories are not writable in the conventional
* sense, but if opened with *either*
* FILE_ADD_FILE or FILE_ADD_SUBDIRECTORY
* they can be flushed.
*/
if ((fsp->access_mask & flush_access) != 0) {
allow_dir_flush = true;
}
if (allow_dir_flush == false) {
tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
return tevent_req_post(req, ev);
}
}
if (fsp->fh->fd == -1) {
tevent_req_nterror(req, NT_STATUS_INVALID_HANDLE);
return tevent_req_post(req, ev);
}
if (!lp_strict_sync(SNUM(smbreq->conn))) {
/*
* No strict sync. Don't really do
* anything here.
*/
tevent_req_done(req);
return tevent_req_post(req, ev);
}
ret = flush_write_cache(fsp, SAMBA_SYNC_FLUSH);
if (ret == -1) {
tevent_req_nterror(req, map_nt_error_from_unix(errno));
return tevent_req_post(req, ev);
}
subreq = SMB_VFS_FSYNC_SEND(state, ev, fsp);
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq, smbd_smb2_flush_done, req);
/* Ensure any close request knows about this outstanding IO. */
if (!aio_add_req_to_fsp(fsp, req)) {
tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
return tevent_req_post(req, ev);
}
return req;
}
static void smbd_smb2_flush_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
int ret;
struct vfs_aio_state vfs_aio_state;
ret = SMB_VFS_FSYNC_RECV(subreq, &vfs_aio_state);
TALLOC_FREE(subreq);
if (ret == -1) {
tevent_req_nterror(req, map_nt_error_from_unix(vfs_aio_state.error));
return;
}
tevent_req_done(req);
}
static NTSTATUS smbd_smb2_flush_recv(struct tevent_req *req)
{
NTSTATUS status;
if (tevent_req_is_nterror(req, &status)) {
tevent_req_received(req);
return status;
}
tevent_req_received(req);
return NT_STATUS_OK;
}
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