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/*
Unix SMB/CIFS implementation.
smb2 lib
Copyright (C) Volker Lendecke 2011
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 smb2cli_read_state {
uint8_t fixed[48];
uint8_t dyn_pad[1];
struct iovec *recv_iov;
uint8_t *data;
uint32_t data_length;
bool out_valid;
};
static void smb2cli_read_done(struct tevent_req *subreq);
struct tevent_req *smb2cli_read_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct smbXcli_conn *conn,
uint32_t timeout_msec,
struct smbXcli_session *session,
struct smbXcli_tcon *tcon,
uint32_t length,
uint64_t offset,
uint64_t fid_persistent,
uint64_t fid_volatile,
uint64_t minimum_count,
uint64_t remaining_bytes)
{
struct tevent_req *req, *subreq;
struct smb2cli_read_state *state;
uint8_t *fixed;
req = tevent_req_create(mem_ctx, &state,
struct smb2cli_read_state);
if (req == NULL) {
return NULL;
}
fixed = state->fixed;
SSVAL(fixed, 0, 49);
SIVAL(fixed, 4, length);
SBVAL(fixed, 8, offset);
SBVAL(fixed, 16, fid_persistent);
SBVAL(fixed, 24, fid_volatile);
SBVAL(fixed, 32, minimum_count);
SBVAL(fixed, 40, remaining_bytes);
subreq = smb2cli_req_send(state, ev, conn, SMB2_OP_READ,
0, 0, /* flags */
timeout_msec,
tcon,
session,
state->fixed, sizeof(state->fixed),
state->dyn_pad, sizeof(state->dyn_pad),
length); /* max_dyn_len */
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq, smb2cli_read_done, req);
return req;
}
static void smb2cli_read_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct smb2cli_read_state *state =
tevent_req_data(req,
struct smb2cli_read_state);
NTSTATUS status;
NTSTATUS error;
struct iovec *iov;
const uint8_t dyn_ofs = SMB2_HDR_BODY + 0x10;
DATA_BLOB dyn_buffer = data_blob_null;
uint8_t data_offset;
DATA_BLOB data_buffer = data_blob_null;
uint32_t next_offset = 0; /* this variable is completely ignored */
static const struct smb2cli_req_expected_response expected[] = {
{
.status = STATUS_BUFFER_OVERFLOW,
.body_size = 0x11
},
{
.status = NT_STATUS_OK,
.body_size = 0x11
}
};
status = smb2cli_req_recv(subreq, state, &iov,
expected, ARRAY_SIZE(expected));
TALLOC_FREE(subreq);
if (NT_STATUS_EQUAL(status, STATUS_BUFFER_OVERFLOW)) {
/* no error */
} else {
if (tevent_req_nterror(req, status)) {
return;
}
}
data_offset = CVAL(iov[1].iov_base, 2);
state->data_length = IVAL(iov[1].iov_base, 4);
dyn_buffer = data_blob_const((uint8_t *)iov[2].iov_base,
iov[2].iov_len);
error = smb2cli_parse_dyn_buffer(dyn_ofs,
dyn_buffer,
dyn_ofs, /* min_offset */
data_offset,
state->data_length,
dyn_buffer.length, /* max_length */
&next_offset,
&data_buffer);
if (tevent_req_nterror(req, error)) {
return;
}
state->recv_iov = iov;
state->data = data_buffer.data;
state->out_valid = true;
if (tevent_req_nterror(req, status)) {
return;
}
tevent_req_done(req);
}
NTSTATUS smb2cli_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
uint8_t **data, uint32_t *data_length)
{
struct smb2cli_read_state *state =
tevent_req_data(req,
struct smb2cli_read_state);
NTSTATUS status = NT_STATUS_OK;
if (tevent_req_is_nterror(req, &status) && !state->out_valid) {
*data_length = 0;
*data = NULL;
tevent_req_received(req);
return status;
}
talloc_steal(mem_ctx, state->recv_iov);
*data_length = state->data_length;
*data = state->data;
tevent_req_received(req);
return status;
}
NTSTATUS smb2cli_read(struct smbXcli_conn *conn,
uint32_t timeout_msec,
struct smbXcli_session *session,
struct smbXcli_tcon *tcon,
uint32_t length,
uint64_t offset,
uint64_t fid_persistent,
uint64_t fid_volatile,
uint64_t minimum_count,
uint64_t remaining_bytes,
TALLOC_CTX *mem_ctx,
uint8_t **data,
uint32_t *data_length)
{
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 = smb2cli_read_send(frame, ev,
conn, timeout_msec, session, tcon,
length, offset,
fid_persistent, fid_volatile,
minimum_count, remaining_bytes);
if (req == NULL) {
goto fail;
}
if (!tevent_req_poll_ntstatus(req, ev, &status)) {
goto fail;
}
status = smb2cli_read_recv(req, mem_ctx, data, data_length);
fail:
TALLOC_FREE(frame);
return status;
}
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