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samba-mirror/source4/libcli/smb2/transport.c

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/*
Unix SMB/CIFS implementation.
SMB2 client transport context management functions
Copyright (C) Andrew Tridgell 2005
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 "libcli/raw/libcliraw.h"
#include "libcli/raw/raw_proto.h"
#include "libcli/smb2/smb2.h"
#include "libcli/smb2/smb2_calls.h"
#include "lib/socket/socket.h"
#include "lib/events/events.h"
#include "../lib/util/dlinklist.h"
#include "../libcli/smb/smbXcli_base.h"
#include "librpc/ndr/libndr.h"
/*
destroy a transport
*/
static int transport_destructor(struct smb2_transport *transport)
{
smb2_transport_dead(transport, NT_STATUS_LOCAL_DISCONNECT);
return 0;
}
/*
create a transport structure based on an established socket
*/
struct smb2_transport *smb2_transport_init(struct smbcli_socket *sock,
TALLOC_CTX *parent_ctx,
struct smbcli_options *options)
{
struct smb2_transport *transport;
transport = talloc_zero(parent_ctx, struct smb2_transport);
if (!transport) return NULL;
transport->ev = sock->event.ctx;
transport->options = *options;
if (transport->options.max_protocol == PROTOCOL_DEFAULT) {
transport->options.max_protocol = PROTOCOL_LATEST;
}
if (transport->options.max_protocol < PROTOCOL_SMB2_02) {
transport->options.max_protocol = PROTOCOL_LATEST;
}
TALLOC_FREE(sock->event.fde);
TALLOC_FREE(sock->event.te);
transport->conn = smbXcli_conn_create(transport,
sock->sock->fd,
sock->hostname,
options->signing,
0, /* smb1_capabilities */
&options->client_guid,
options->smb2_capabilities,
&options->smb3_capabilities);
if (transport->conn == NULL) {
talloc_free(transport);
return NULL;
}
sock->sock->fd = -1;
TALLOC_FREE(sock);
talloc_set_destructor(transport, transport_destructor);
return transport;
}
/*
create a transport structure based on an established socket
*/
NTSTATUS smb2_transport_raw_init(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct smbXcli_conn **_conn,
const struct smbcli_options *options,
struct smb2_transport **_transport)
{
struct smb2_transport *transport = NULL;
enum protocol_types protocol;
if (*_conn == NULL) {
return NT_STATUS_INVALID_PARAMETER;
}
protocol = smbXcli_conn_protocol(*_conn);
if (protocol < PROTOCOL_SMB2_02) {
return NT_STATUS_REVISION_MISMATCH;
}
transport = talloc_zero(mem_ctx, struct smb2_transport);
if (transport == NULL) {
return NT_STATUS_NO_MEMORY;
}
transport->ev = ev;
transport->options = *options;
transport->conn = talloc_move(transport, _conn);
talloc_set_destructor(transport, transport_destructor);
*_transport = transport;
return NT_STATUS_OK;
}
/*
mark the transport as dead
*/
void smb2_transport_dead(struct smb2_transport *transport, NTSTATUS status)
{
if (NT_STATUS_EQUAL(NT_STATUS_UNSUCCESSFUL, status)) {
status = NT_STATUS_UNEXPECTED_NETWORK_ERROR;
}
if (NT_STATUS_IS_OK(status)) {
status = NT_STATUS_LOCAL_DISCONNECT;
}
smbXcli_conn_disconnect(transport->conn, status);
}
static void smb2_request_done(struct tevent_req *subreq);
static void smb2_transport_break_handler(struct tevent_req *subreq);
/*
put a request into the send queue
*/
void smb2_transport_send(struct smb2_request *req)
{
NTSTATUS status;
struct smb2_transport *transport = req->transport;
struct tevent_req **reqs = transport->compound.reqs;
size_t num_reqs = talloc_array_length(reqs);
size_t i;
uint16_t cmd = SVAL(req->out.hdr, SMB2_HDR_OPCODE);
uint32_t additional_flags = IVAL(req->out.hdr, SMB2_HDR_FLAGS);
uint32_t clear_flags = 0;
struct smbXcli_tcon *tcon = NULL;
struct smbXcli_session *session = NULL;
bool need_pending_break = false;
size_t hdr_ofs;
size_t pdu_len;
DATA_BLOB body = data_blob_null;
DATA_BLOB dyn = data_blob_null;
uint32_t timeout_msec = transport->options.request_timeout * 1000;
if (transport->oplock.handler) {
need_pending_break = true;
}
if (transport->lease.handler) {
need_pending_break = true;
}
if (transport->break_subreq) {
need_pending_break = false;
}
if (need_pending_break) {
struct tevent_req *subreq;
subreq = smb2cli_req_create(transport,
transport->ev,
transport->conn,
SMB2_OP_BREAK,
0, /* additional_flags */
0, /*clear_flags */
0, /* timeout_msec */
NULL, /* tcon */
NULL, /* session */
NULL, /* body */
0, /* body_fixed */
NULL, /* dyn */
0, /* dyn_len */
0); /* max_dyn_len */
if (subreq != NULL) {
smbXcli_req_set_pending(subreq);
tevent_req_set_callback(subreq,
smb2_transport_break_handler,
transport);
transport->break_subreq = subreq;
}
}
if (req->session) {
session = req->session->smbXcli;
}
if (req->tree) {
tcon = req->tree->smbXcli;
}
if (transport->compound.related) {
additional_flags |= SMB2_HDR_FLAG_CHAINED;
}
hdr_ofs = PTR_DIFF(req->out.hdr, req->out.buffer);
pdu_len = req->out.size - hdr_ofs;
body.data = req->out.body;
body.length = req->out.body_fixed;
dyn.data = req->out.body + req->out.body_fixed;
dyn.length = pdu_len - (SMB2_HDR_BODY + req->out.body_fixed);
req->subreq = smb2cli_req_create(req,
transport->ev,
transport->conn,
cmd,
additional_flags,
clear_flags,
timeout_msec,
tcon,
session,
body.data, body.length,
dyn.data, dyn.length,
0); /* max_dyn_len */
if (req->subreq == NULL) {
req->state = SMB2_REQUEST_ERROR;
req->status = NT_STATUS_NO_MEMORY;
return;
}
if (!tevent_req_is_in_progress(req->subreq)) {
req->state = SMB2_REQUEST_ERROR;
req->status = NT_STATUS_INTERNAL_ERROR;/* TODO */
return;
}
tevent_req_set_callback(req->subreq, smb2_request_done, req);
smb2cli_req_set_notify_async(req->subreq);
if (req->credit_charge) {
smb2cli_req_set_credit_charge(req->subreq, req->credit_charge);
}
ZERO_STRUCT(req->out);
req->state = SMB2_REQUEST_RECV;
if (num_reqs > 0) {
for (i=0; i < num_reqs; i++) {
if (reqs[i] != NULL) {
continue;
}
reqs[i] = req->subreq;
i++;
break;
}
if (i < num_reqs) {
return;
}
} else {
reqs = &req->subreq;
num_reqs = 1;
}
status = smb2cli_req_compound_submit(reqs, num_reqs);
TALLOC_FREE(transport->compound.reqs);
transport->compound.related = false;
if (!NT_STATUS_IS_OK(status)) {
req->status = status;
req->state = SMB2_REQUEST_ERROR;
smbXcli_conn_disconnect(transport->conn, status);
}
}
static void smb2_request_done(struct tevent_req *subreq)
{
struct smb2_request *req =
tevent_req_callback_data(subreq,
struct smb2_request);
ssize_t len;
size_t i;
req->recv_iov = NULL;
req->status = smb2cli_req_recv(req->subreq, req, &req->recv_iov, NULL, 0);
if (NT_STATUS_EQUAL(req->status, NT_STATUS_PENDING)) {
struct timeval endtime = smbXcli_req_endtime(subreq);
bool ok;
req->cancel.can_cancel = true;
if (timeval_is_zero(&endtime)) {
return;
}
ok = tevent_req_set_endtime(
subreq, req->transport->ev, endtime);
if (!ok) {
req->status = NT_STATUS_INTERNAL_ERROR;
req->state = SMB2_REQUEST_ERROR;
if (req->async.fn) {
req->async.fn(req);
}
return;
}
return;
}
TALLOC_FREE(req->subreq);
if (!NT_STATUS_IS_OK(req->status)) {
if (req->recv_iov == NULL) {
req->state = SMB2_REQUEST_ERROR;
if (req->async.fn) {
req->async.fn(req);
}
return;
}
}
len = req->recv_iov[0].iov_len;
for (i=1; i < 3; i++) {
uint8_t *p = req->recv_iov[i-1].iov_base;
uint8_t *c1 = req->recv_iov[i].iov_base;
uint8_t *c2 = p + req->recv_iov[i-1].iov_len;
len += req->recv_iov[i].iov_len;
if (req->recv_iov[i].iov_len == 0) {
continue;
}
if (c1 != c2) {
req->status = NT_STATUS_INTERNAL_ERROR;
req->state = SMB2_REQUEST_ERROR;
if (req->async.fn) {
req->async.fn(req);
}
return;
}
}
req->in.buffer = req->recv_iov[0].iov_base;
req->in.size = len;
req->in.allocated = req->in.size;
req->in.hdr = req->recv_iov[0].iov_base;
req->in.body = req->recv_iov[1].iov_base;
req->in.dynamic = req->recv_iov[2].iov_base;
req->in.body_fixed = req->recv_iov[1].iov_len;
req->in.body_size = req->in.body_fixed;
req->in.body_size += req->recv_iov[2].iov_len;
smb2_setup_bufinfo(req);
req->state = SMB2_REQUEST_DONE;
if (req->async.fn) {
req->async.fn(req);
}
}
static void smb2_transport_break_handler(struct tevent_req *subreq)
{
struct smb2_transport *transport =
tevent_req_callback_data(subreq,
struct smb2_transport);
NTSTATUS status;
uint8_t *body;
uint16_t len = 0;
bool lease;
struct iovec *recv_iov = NULL;
transport->break_subreq = NULL;
status = smb2cli_req_recv(subreq, transport, &recv_iov, NULL, 0);
TALLOC_FREE(subreq);
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(recv_iov);
smb2_transport_dead(transport, status);
return;
}
/*
* Setup the subreq to handle the
* next incoming SMB2 Break.
*/
subreq = smb2cli_req_create(transport,
transport->ev,
transport->conn,
SMB2_OP_BREAK,
0, /* additional_flags */
0, /*clear_flags */
0, /* timeout_msec */
NULL, /* tcon */
NULL, /* session */
NULL, /* body */
0, /* body_fixed */
NULL, /* dyn */
0, /* dyn_len */
0); /* max_dyn_len */
if (subreq != NULL) {
smbXcli_req_set_pending(subreq);
tevent_req_set_callback(subreq,
smb2_transport_break_handler,
transport);
transport->break_subreq = subreq;
}
body = recv_iov[1].iov_base;
len = recv_iov[1].iov_len;
if (recv_iov[1].iov_len >= 2) {
len = CVAL(body, 0x00);
if (len != recv_iov[1].iov_len) {
len = recv_iov[1].iov_len;
}
}
if (len == 24) {
lease = false;
} else if (len == 44) {
lease = true;
} else {
DEBUG(1,("Discarding smb2 oplock reply of invalid size %u\n",
(unsigned)len));
TALLOC_FREE(recv_iov);
status = NT_STATUS_INVALID_NETWORK_RESPONSE;
smb2_transport_dead(transport, status);
return;
}
if (!lease && transport->oplock.handler) {
struct smb2_handle h;
uint8_t level;
level = CVAL(body, 0x02);
smb2_pull_handle(body+0x08, &h);
TALLOC_FREE(recv_iov);
transport->oplock.handler(transport, &h, level,
transport->oplock.private_data);
} else if (lease && transport->lease.handler) {
struct smb2_lease_break lb;
ZERO_STRUCT(lb);
lb.new_epoch = SVAL(body, 0x2);
lb.break_flags = SVAL(body, 0x4);
memcpy(&lb.current_lease.lease_key, body+0x8,
sizeof(struct smb2_lease_key));
lb.current_lease.lease_state = SVAL(body, 0x18);
lb.new_lease_state = SVAL(body, 0x1C);
lb.break_reason = SVAL(body, 0x20);
lb.access_mask_hint = SVAL(body, 0x24);
lb.share_mask_hint = SVAL(body, 0x28);
TALLOC_FREE(recv_iov);
transport->lease.handler(transport, &lb,
transport->lease.private_data);
} else {
DEBUG(5,("Got SMB2 %s break with no handler\n",
lease ? "lease" : "oplock"));
}
TALLOC_FREE(recv_iov);
}
NTSTATUS smb2_transport_compound_start(struct smb2_transport *transport,
uint32_t num)
{
TALLOC_FREE(transport->compound.reqs);
ZERO_STRUCT(transport->compound);
transport->compound.reqs = talloc_zero_array(transport,
struct tevent_req *,
num);
if (transport->compound.reqs == NULL) {
return NT_STATUS_NO_MEMORY;
}
return NT_STATUS_OK;
}
void smb2_transport_compound_set_related(struct smb2_transport *transport,
bool related)
{
transport->compound.related = related;
}
void smb2_transport_credits_ask_num(struct smb2_transport *transport,
uint16_t ask_num)
{
smb2cli_conn_set_max_credits(transport->conn, ask_num);
}
static void idle_handler(struct tevent_context *ev,
struct tevent_timer *te, struct timeval t, void *private_data)
{
struct smb2_transport *transport = talloc_get_type(private_data,
struct smb2_transport);
struct timeval next;
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transport->idle.func(transport, transport->idle.private_data);
if (transport->idle.func == NULL) {
return;
}
if (!smbXcli_conn_is_connected(transport->conn)) {
return;
}
next = timeval_current_ofs_usec(transport->idle.period);
transport->idle.te = tevent_add_timer(transport->ev,
transport,
next,
idle_handler,
transport);
}
/*
setup the idle handler for a transport
the period is in microseconds
*/
void smb2_transport_idle_handler(struct smb2_transport *transport,
void (*idle_func)(struct smb2_transport *, void *),
uint64_t period,
void *private_data)
{
TALLOC_FREE(transport->idle.te);
ZERO_STRUCT(transport->idle);
if (idle_func == NULL) {
return;
}
if (!smbXcli_conn_is_connected(transport->conn)) {
return;
}
transport->idle.func = idle_func;
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transport->idle.private_data = private_data;
transport->idle.period = period;
transport->idle.te = tevent_add_timer(transport->ev,
transport,
timeval_current_ofs_usec(period),
idle_handler,
transport);
}