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/*
Unix SMB/CIFS implementation.
smb2 lib
Copyright (C) Stefan Metzmacher 2012
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 "system/network.h"
#include "lib/util/tevent_ntstatus.h"
#include "smb_common.h"
#include "smbXcli_base.h"
struct smb1cli_echo_state {
uint16_t vwv[1];
DATA_BLOB data;
uint16_t num_echos;
};
static void smb1cli_echo_done(struct tevent_req *subreq);
struct tevent_req *smb1cli_echo_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct smbXcli_conn *conn,
uint32_t timeout_msec,
uint16_t num_echos,
DATA_BLOB data)
{
struct tevent_req *req, *subreq;
struct smb1cli_echo_state *state;
req = tevent_req_create(mem_ctx, &state, struct smb1cli_echo_state);
if (req == NULL) {
return NULL;
}
SSVAL(state->vwv, 0, num_echos);
state->data = data;
state->num_echos = num_echos;
subreq = smb1cli_req_send(state, ev, conn, SMBecho,
0, 0, /* *_flags */
0, 0, /* *_flags2 */
timeout_msec,
0, /* pid */
NULL, /* tcon */
NULL, /* session */
ARRAY_SIZE(state->vwv), state->vwv,
data.length, data.data);
if (subreq == NULL) {
goto fail;
}
tevent_req_set_callback(subreq, smb1cli_echo_done, req);
return req;
fail:
TALLOC_FREE(req);
return NULL;
}
static void smb1cli_echo_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct smb1cli_echo_state *state = tevent_req_data(
req, struct smb1cli_echo_state);
NTSTATUS status;
uint32_t num_bytes;
uint8_t *bytes;
struct iovec *recv_iov;
struct smb1cli_req_expected_response expected[] = {
{
.status = NT_STATUS_OK,
.wct = 1,
},
};
status = smb1cli_req_recv(subreq, state,
&recv_iov,
NULL, /* phdr */
NULL, /* pwct */
NULL, /* pvwv */
NULL, /* pvwv_offset */
&num_bytes,
&bytes,
NULL, /* pbytes_offset */
NULL, /* pinbuf */
expected, ARRAY_SIZE(expected));
if (!NT_STATUS_IS_OK(status)) {
tevent_req_nterror(req, status);
return;
}
if (num_bytes != state->data.length) {
tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
return;
}
if (memcmp(bytes, state->data.data, num_bytes) != 0) {
tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
return;
}
/* TODO: do we want to verify the sequence number? */
state->num_echos -=1;
if (state->num_echos == 0) {
tevent_req_done(req);
return;
}
if (!smbXcli_req_set_pending(subreq)) {
tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
return;
}
}
/**
* Get the result out from an echo request
* @param[in] req The async_req from smb1cli_echo_send
* @retval Did the server reply correctly?
*/
NTSTATUS smb1cli_echo_recv(struct tevent_req *req)
{
return tevent_req_simple_recv_ntstatus(req);
}
NTSTATUS smb1cli_echo(struct smbXcli_conn *conn, uint32_t timeout_msec,
uint16_t num_echos, DATA_BLOB data)
{
TALLOC_CTX *frame = talloc_stackframe();
struct tevent_context *ev;
struct tevent_req *req;
NTSTATUS status = NT_STATUS_NO_MEMORY;
if (smbXcli_conn_has_async_calls(conn)) {
/*
* Can't use sync call while an async call is in flight
*/
status = NT_STATUS_INVALID_PARAMETER;
goto fail;
}
ev = samba_tevent_context_init(frame);
if (ev == NULL) {
goto fail;
}
req = smb1cli_echo_send(frame, ev, conn, timeout_msec, num_echos, data);
if (req == NULL) {
goto fail;
}
if (!tevent_req_poll_ntstatus(req, ev, &status)) {
goto fail;
}
status = smb1cli_echo_recv(req);
fail:
TALLOC_FREE(frame);
return status;
}
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