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/*
Unix SMB/CIFS implementation.
Core SMB2 server
Copyright (C) Stefan Metzmacher 2009
Copyright (C) Jeremy Allison 2010
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"
static struct tevent_req *smbd_smb2_oplock_break_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct smbd_smb2_request *smb2req,
struct files_struct *in_fsp,
uint8_t in_oplock_level);
static NTSTATUS smbd_smb2_oplock_break_recv(struct tevent_req *req,
uint8_t *out_oplock_level);
static void smbd_smb2_request_oplock_break_done(struct tevent_req *subreq);
NTSTATUS smbd_smb2_request_process_break(struct smbd_smb2_request *req)
{
NTSTATUS status;
const uint8_t *inbody;
int i = req->current_idx;
uint8_t in_oplock_level;
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 = (const uint8_t *)req->in.vector[i+1].iov_base;
in_oplock_level = CVAL(inbody, 0x02);
if (in_oplock_level != SMB2_OPLOCK_LEVEL_NONE &&
in_oplock_level != SMB2_OPLOCK_LEVEL_II) {
return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
}
/* 0x03 1 bytes reserved */
/* 0x04 4 bytes reserved */
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_oplock_break_send(req, req->sconn->ev_ctx,
req, in_fsp, in_oplock_level);
if (subreq == NULL) {
return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
}
tevent_req_set_callback(subreq, smbd_smb2_request_oplock_break_done, req);
return smbd_smb2_request_pending_queue(req, subreq, 500);
}
static void smbd_smb2_request_oplock_break_done(struct tevent_req *subreq)
{
struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
struct smbd_smb2_request);
const uint8_t *inbody;
int i = req->current_idx;
uint64_t in_file_id_persistent;
uint64_t in_file_id_volatile;
uint8_t out_oplock_level = 0;
DATA_BLOB outbody;
NTSTATUS status;
NTSTATUS error; /* transport error */
status = smbd_smb2_oplock_break_recv(subreq, &out_oplock_level);
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->sconn,
nt_errstr(error));
return;
}
return;
}
inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
in_file_id_persistent = BVAL(inbody, 0x08);
in_file_id_volatile = BVAL(inbody, 0x10);
outbody = data_blob_talloc(req->out.vector, NULL, 0x18);
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->sconn,
nt_errstr(error));
return;
}
return;
}
SSVAL(outbody.data, 0x00, 0x18); /* struct size */
SCVAL(outbody.data, 0x02,
out_oplock_level); /* SMB2 oplock level */
SCVAL(outbody.data, 0x03, 0); /* reserved */
SIVAL(outbody.data, 0x04, 0); /* reserved */
SBVAL(outbody.data, 0x08,
in_file_id_persistent); /* file id (persistent) */
SBVAL(outbody.data, 0x10,
in_file_id_volatile); /* file id (volatile) */
error = smbd_smb2_request_done(req, outbody, NULL);
if (!NT_STATUS_IS_OK(error)) {
smbd_server_connection_terminate(req->sconn,
nt_errstr(error));
return;
}
}
struct smbd_smb2_oplock_break_state {
struct smbd_smb2_request *smb2req;
uint8_t out_oplock_level; /* SMB2 oplock level. */
};
static struct tevent_req *smbd_smb2_oplock_break_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct smbd_smb2_request *smb2req,
struct files_struct *fsp,
uint8_t in_oplock_level)
{
struct tevent_req *req;
struct smbd_smb2_oplock_break_state *state;
struct smb_request *smbreq;
int oplocklevel = map_smb2_oplock_levels_to_samba(in_oplock_level);
bool break_to_none = (oplocklevel == NO_OPLOCK);
bool result;
req = tevent_req_create(mem_ctx, &state,
struct smbd_smb2_oplock_break_state);
if (req == NULL) {
return NULL;
}
state->smb2req = smb2req;
state->out_oplock_level = SMB2_OPLOCK_LEVEL_NONE;
DEBUG(10,("smbd_smb2_oplock_break_send: %s - %s, "
"samba level %d\n",
fsp_str_dbg(fsp), fsp_fnum_dbg(fsp),
oplocklevel));
smbreq = smbd_smb2_fake_smb_request(smb2req);
if (tevent_req_nomem(smbreq, req)) {
return tevent_req_post(req, ev);
}
DEBUG(5,("smbd_smb2_oplock_break_send: got SMB2 oplock break (%u) from client "
"for file %s, %s\n",
(unsigned int)in_oplock_level,
fsp_str_dbg(fsp),
fsp_fnum_dbg(fsp)));
/* Are we awaiting a break message ? */
if (fsp->oplock_timeout == NULL) {
tevent_req_nterror(req, NT_STATUS_INVALID_OPLOCK_PROTOCOL);
return tevent_req_post(req, ev);
}
if ((fsp->sent_oplock_break == BREAK_TO_NONE_SENT) ||
(break_to_none)) {
result = remove_oplock(fsp);
state->out_oplock_level = SMB2_OPLOCK_LEVEL_NONE;
} else {
result = downgrade_oplock(fsp);
state->out_oplock_level = SMB2_OPLOCK_LEVEL_II;
}
if (!result) {
DEBUG(0, ("smbd_smb2_oplock_break_send: error in removing "
"oplock on file %s\n", fsp_str_dbg(fsp)));
/* Hmmm. Is this panic justified? */
smb_panic("internal tdb error");
}
reply_to_oplock_break_requests(fsp);
tevent_req_done(req);
return tevent_req_post(req, ev);
}
static NTSTATUS smbd_smb2_oplock_break_recv(struct tevent_req *req,
uint8_t *out_oplock_level)
{
NTSTATUS status;
struct smbd_smb2_oplock_break_state *state =
tevent_req_data(req,
struct smbd_smb2_oplock_break_state);
if (tevent_req_is_nterror(req, &status)) {
tevent_req_received(req);
return status;
}
*out_oplock_level = state->out_oplock_level;
tevent_req_received(req);
return NT_STATUS_OK;
}
/*********************************************************
Create and send an asynchronous
SMB2 OPLOCK_BREAK_NOTIFICATION.
*********************************************************/
void send_break_message_smb2(files_struct *fsp, int level)
{
uint8_t smb2_oplock_level = (level == OPLOCKLEVEL_II) ?
SMB2_OPLOCK_LEVEL_II :
SMB2_OPLOCK_LEVEL_NONE;
NTSTATUS status;
uint64_t fsp_persistent = fsp_persistent_id(fsp);
DEBUG(10,("send_break_message_smb2: sending oplock break "
"for file %s, %s, smb2 level %u\n",
fsp_str_dbg(fsp),
fsp_fnum_dbg(fsp),
(unsigned int)smb2_oplock_level ));
status = smbd_smb2_send_oplock_break(fsp->conn->sconn,
fsp_persistent,
fsp->fnum,
smb2_oplock_level);
if (!NT_STATUS_IS_OK(status)) {
smbd_server_connection_terminate(fsp->conn->sconn,
nt_errstr(status));
}
}
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