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/*
Unix SMB/CIFS implementation.
SMB client oplock functions
Copyright (C) Andrew Tridgell 2001
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 "../lib/util/tevent_ntstatus.h"
#include "async_smb.h"
#include "libsmb/libsmb.h"
/****************************************************************************
send an ack for an oplock break request
****************************************************************************/
struct cli_oplock_ack_state {
uint16_t vwv[8];
};
static void cli_oplock_ack_done(struct tevent_req *subreq);
struct tevent_req *cli_oplock_ack_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct cli_state *cli,
uint16_t fnum, uint8_t level)
{
struct tevent_req *req, *subreq;
struct cli_oplock_ack_state *state;
req = tevent_req_create(mem_ctx, &state, struct cli_oplock_ack_state);
if (req == NULL) {
return NULL;
}
SCVAL(state->vwv+0, 0, 0xff);
SCVAL(state->vwv+0, 1, 0);
SSVAL(state->vwv+1, 0, 0);
SSVAL(state->vwv+2, 0, fnum);
SCVAL(state->vwv+3, 0, LOCKING_ANDX_OPLOCK_RELEASE);
SCVAL(state->vwv+3, 1, level);
SIVAL(state->vwv+4, 0, 0); /* timeout */
SSVAL(state->vwv+6, 0, 0); /* unlockcount */
SSVAL(state->vwv+7, 0, 0); /* lockcount */
subreq = cli_smb_send(state, ev, cli, SMBlockingX, 0, 8, state->vwv,
0, NULL);
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq, cli_oplock_ack_done, req);
return req;
}
static void cli_oplock_ack_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
NTSTATUS status;
status = cli_smb_recv(subreq, NULL, NULL, 0, NULL, NULL, NULL, NULL);
TALLOC_FREE(subreq);
if (!NT_STATUS_IS_OK(status)) {
tevent_req_nterror(req, status);
return;
}
tevent_req_done(req);
}
NTSTATUS cli_oplock_ack_recv(struct tevent_req *req)
{
return tevent_req_simple_recv_ntstatus(req);
}
NTSTATUS cli_oplock_ack(struct cli_state *cli, uint16_t fnum, unsigned char level)
{
TALLOC_CTX *frame = talloc_stackframe();
struct event_context *ev;
struct tevent_req *req;
NTSTATUS status = NT_STATUS_OK;
if (cli_has_async_calls(cli)) {
/*
* Can't use sync call while an async call is in flight
*/
status = NT_STATUS_INVALID_PARAMETER;
goto fail;
}
ev = event_context_init(frame);
if (ev == NULL) {
status = NT_STATUS_NO_MEMORY;
goto fail;
}
req = cli_oplock_ack_send(frame, ev, cli, fnum, level);
if (req == NULL) {
status = NT_STATUS_NO_MEMORY;
goto fail;
}
if (!tevent_req_poll(req, ev)) {
status = map_nt_error_from_unix(errno);
goto fail;
}
status = cli_oplock_ack_recv(req);
fail:
TALLOC_FREE(frame);
if (!NT_STATUS_IS_OK(status)) {
cli_set_error(cli, status);
}
return status;
}
/****************************************************************************
set the oplock handler for a connection
****************************************************************************/
void cli_oplock_handler(struct cli_state *cli,
NTSTATUS (*handler)(struct cli_state *, uint16_t, unsigned char))
{
cli->oplock_handler = handler;
}
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