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rail.go
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rail.go
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package rdp
import (
"bytes"
"encoding/binary"
"io"
"github.com/kulaginds/rdp-html5/internal/pkg/rdp/utf16"
)
type RailState uint8
// State machine described in [MS-RDPERP] 3.1.1.1.
const (
RailStateUninitialized RailState = iota
RailStateInitializing
RailStateSyncDesktop
RailStateWaitForData
RailStateExecuteApp
)
func (c *client) handleRail(wire io.Reader) error {
if c.remoteApp == nil {
return nil
}
var (
input RailPDU
err error
)
if err = input.Deserialize(wire); err != nil {
return err
}
if input.header.OrderType == RailOrderSysParam {
return nil
}
switch c.railState {
case RailStateInitializing:
return c.railHandshake(&input)
case RailStateExecuteApp:
return c.railReceiveRemoteAppStatus(&input)
}
return nil
}
type RailOrder uint16
const (
// RailOrderExec TS_RAIL_ORDER_EXEC
RailOrderExec RailOrder = 0x0001
// RailOrderActivate TS_RAIL_ORDER_ACTIVATE
RailOrderActivate RailOrder = 0x0002
// RailOrderSysParam TS_RAIL_ORDER_SYSPARAM
RailOrderSysParam RailOrder = 0x0003
// RailOrderSysCommand TS_RAIL_ORDER_SYSCOMMAND
RailOrderSysCommand RailOrder = 0x0004
// RailOrderHandshake TS_RAIL_ORDER_HANDSHAKE
RailOrderHandshake RailOrder = 0x0005
// RailOrderNotifyEvent TS_RAIL_ORDER_NOTIFY_EVENT
RailOrderNotifyEvent RailOrder = 0x0006
// RailOrderWindowMove TS_RAIL_ORDER_WINDOWMOVE
RailOrderWindowMove RailOrder = 0x0008
// RailOrderLocalMoveSize TS_RAIL_ORDER_LOCALMOVESIZE
RailOrderLocalMoveSize RailOrder = 0x0009
// RailOrderMinMaxInfo TS_RAIL_ORDER_MINMAXINFO
RailOrderMinMaxInfo RailOrder = 0x000a
// RailOrderClientStatus TS_RAIL_ORDER_CLIENTSTATUS
RailOrderClientStatus RailOrder = 0x000b
// RailOrderSysMenu TS_RAIL_ORDER_SYSMENU
RailOrderSysMenu RailOrder = 0x000c
// RailOrderLangBarInfo TS_RAIL_ORDER_LANGBARINFO
RailOrderLangBarInfo RailOrder = 0x000d
// RailOrderExecResult TS_RAIL_ORDER_EXEC_RESULT
RailOrderExecResult RailOrder = 0x0080
// RailOrderGetAppIDReq TS_RAIL_ORDER_GET_APPID_REQ
RailOrderGetAppIDReq RailOrder = 0x000E
// RailOrderAppIDResp TS_RAIL_ORDER_GET_APPID_RESP
RailOrderAppIDResp RailOrder = 0x000F
// RailOrderTaskBarInfo TS_RAIL_ORDER_TASKBARINFO
RailOrderTaskBarInfo RailOrder = 0x0010
// RailOrderLanguageIMEInfo TS_RAIL_ORDER_LANGUAGEIMEINFO
RailOrderLanguageIMEInfo RailOrder = 0x0011
// RailOrderCompartmentInfo TS_RAIL_ORDER_COMPARTMENTINFO
RailOrderCompartmentInfo RailOrder = 0x0012
// RailOrderHandshakeEx TS_RAIL_ORDER_HANDSHAKE_EX
RailOrderHandshakeEx RailOrder = 0x0013
// RailOrderZOrderSync TS_RAIL_ORDER_ZORDER_SYNC
RailOrderZOrderSync RailOrder = 0x0014
// RailOrderCloak TS_RAIL_ORDER_CLOAK
RailOrderCloak RailOrder = 0x0015
// RailOrderPowerDisplayRequest TS_RAIL_ORDER_POWER_DISPLAY_REQUEST
RailOrderPowerDisplayRequest RailOrder = 0x0016
// RailOrderSnapArrange TS_RAIL_ORDER_SNAP_ARRANGE
RailOrderSnapArrange RailOrder = 0x0017
// RailOrderGetAppIDRespEx TS_RAIL_ORDER_GET_APPID_RESP_EX
RailOrderGetAppIDRespEx RailOrder = 0x0018
// RailOrderTextScaleInfo TS_RAIL_ORDER_TEXTSCALEINFO
RailOrderTextScaleInfo RailOrder = 0x0019
// RailOrderCaretBlinkInfo TS_RAIL_ORDER_CARETBLINKINFO
RailOrderCaretBlinkInfo RailOrder = 0x001A
)
type RailPDU struct {
channelHeader ChannelPDUHeader
header RailPDUHeader
RailPDUHandshake *RailPDUHandshake
RailPDUClientInfo *RailPDUClientInfo
RailPDUClientExecute *RailPDUClientExecute
RailPDUSystemParameters *RailPDUSystemParameters
RailPDUExecResult *RailPDUExecResult
RailPDUClientSystemParamUpdate *RailPDUClientSystemParamUpdate
}
func (pdu *RailPDU) Serialize() []byte {
var data []byte
switch pdu.header.OrderType {
case RailOrderHandshake:
data = pdu.RailPDUHandshake.Serialize()
case RailOrderExec:
data = pdu.RailPDUClientExecute.Serialize()
case RailOrderSysParam:
data = pdu.RailPDUClientSystemParamUpdate.Serialize()
}
pdu.header.OrderLength = uint16(8 + 4 + len(data))
buf := new(bytes.Buffer)
buf.Write(pdu.channelHeader.Serialize())
buf.Write(pdu.header.Serialize())
buf.Write(data)
return buf.Bytes()
}
func (pdu *RailPDU) Deserialize(wire io.Reader) error {
var err error
err = pdu.channelHeader.Deserialize(wire)
if err != nil {
return err
}
err = pdu.header.Deserialize(wire)
if err != nil {
return err
}
switch pdu.header.OrderType {
case RailOrderHandshake:
pdu.RailPDUHandshake = &RailPDUHandshake{}
return pdu.RailPDUHandshake.Deserialize(wire)
case RailOrderSysParam:
pdu.RailPDUSystemParameters = &RailPDUSystemParameters{}
return pdu.RailPDUSystemParameters.Deserialize(wire)
case RailOrderExecResult:
pdu.RailPDUExecResult = &RailPDUExecResult{}
return pdu.RailPDUExecResult.Deserialize(wire)
}
return nil
}
type RailPDUHeader struct {
OrderType RailOrder
OrderLength uint16
}
func (h *RailPDUHeader) Serialize() []byte {
buf := new(bytes.Buffer)
binary.Write(buf, binary.LittleEndian, uint16(h.OrderType))
binary.Write(buf, binary.LittleEndian, h.OrderLength)
return buf.Bytes()
}
func (h *RailPDUHeader) Deserialize(wire io.Reader) error {
var err error
var orderType uint16
err = binary.Read(wire, binary.LittleEndian, &orderType)
if err != nil {
return err
}
h.OrderType = RailOrder(orderType)
err = binary.Read(wire, binary.LittleEndian, &h.OrderLength)
if err != nil {
return err
}
return nil
}
type RailPDUHandshake struct {
buildNumber uint32
}
func NewRailHandshakePDU() *RailPDU {
return &RailPDU{
channelHeader: ChannelPDUHeader{
Flags: ChannelFlagFirst | ChannelFlagLast,
},
header: RailPDUHeader{
OrderType: RailOrderHandshake,
},
RailPDUHandshake: &RailPDUHandshake{
buildNumber: 0x00001DB0,
},
}
}
func (pdu *RailPDUHandshake) Serialize() []byte {
buf := new(bytes.Buffer)
binary.Write(buf, binary.LittleEndian, pdu.buildNumber)
return buf.Bytes()
}
func (pdu *RailPDUHandshake) Deserialize(wire io.Reader) error {
var err error
err = binary.Read(wire, binary.LittleEndian, &pdu.buildNumber)
if err != nil {
return err
}
return nil
}
type RailPDUClientInfo struct {
Flags uint32
}
func NewRailClientInfoPDU() *RailPDU {
return &RailPDU{
channelHeader: ChannelPDUHeader{
Flags: ChannelFlagFirst | ChannelFlagLast,
},
header: RailPDUHeader{
OrderType: RailOrderClientStatus,
},
RailPDUClientInfo: &RailPDUClientInfo{
Flags: 0, // none of the features are supported
},
}
}
func (pdu *RailPDUClientInfo) Serialize() []byte {
buf := new(bytes.Buffer)
binary.Write(buf, binary.LittleEndian, pdu.Flags)
return buf.Bytes()
}
type RailPDUClientSystemParamUpdate struct {
SystemParam uint32
Body uint8
}
func NewRailPDUClientSystemParamUpdate(systemParam uint32, body uint8) *RailPDU {
return &RailPDU{
channelHeader: ChannelPDUHeader{
Flags: ChannelFlagFirst | ChannelFlagLast,
},
header: RailPDUHeader{
OrderType: RailOrderSysParam,
},
RailPDUClientSystemParamUpdate: &RailPDUClientSystemParamUpdate{
SystemParam: systemParam,
Body: body,
},
}
}
func (pdu *RailPDUClientSystemParamUpdate) Serialize() []byte {
buf := new(bytes.Buffer)
binary.Write(buf, binary.LittleEndian, pdu.SystemParam)
binary.Write(buf, binary.LittleEndian, pdu.Body)
return buf.Bytes()
}
func (c *client) railHandshake(*RailPDU) error {
var (
err error
)
clientHandshake := NewRailHandshakePDU()
err = c.mcsLayer.Send(c.userID, c.channelIDMap["rail"], clientHandshake.Serialize())
if err != nil {
return err
}
clientInfo := NewRailClientInfoPDU()
err = c.mcsLayer.Send(c.userID, c.channelIDMap["rail"], clientInfo.Serialize())
if err != nil {
return err
}
c.railState = RailStateWaitForData
return c.railStartRemoteApp()
}
type RailPDUSystemParameters struct {
SystemParameter uint32
Body uint8
}
func (pdu *RailPDUSystemParameters) Deserialize(wire io.Reader) error {
var err error
err = binary.Read(wire, binary.LittleEndian, &pdu.SystemParameter)
if err != nil {
return err
}
err = binary.Read(wire, binary.LittleEndian, &pdu.Body)
if err != nil {
return err
}
return nil
}
type RailPDUClientExecute struct {
Flags uint16
ExeOrFile string
WorkingDir string
Arguments string
}
func NewRailClientExecutePDU(app, workDir, args string) *RailPDU {
return &RailPDU{
channelHeader: ChannelPDUHeader{
Flags: ChannelFlagFirst | ChannelFlagLast,
},
header: RailPDUHeader{
OrderType: RailOrderExec,
},
RailPDUClientExecute: &RailPDUClientExecute{
ExeOrFile: app,
WorkingDir: workDir,
Arguments: args,
},
}
}
func (pdu *RailPDUClientExecute) Serialize() []byte {
exeOrFile := utf16.Encode(pdu.ExeOrFile)
exeOrFileLength := uint16(len(exeOrFile))
workingDir := utf16.Encode(pdu.WorkingDir)
workingDirLength := uint16(len(workingDir))
arguments := utf16.Encode(pdu.Arguments)
argumentsLen := uint16(len(arguments))
buf := new(bytes.Buffer)
binary.Write(buf, binary.LittleEndian, pdu.Flags)
binary.Write(buf, binary.LittleEndian, exeOrFileLength)
binary.Write(buf, binary.LittleEndian, workingDirLength)
binary.Write(buf, binary.LittleEndian, argumentsLen)
binary.Write(buf, binary.LittleEndian, exeOrFile)
binary.Write(buf, binary.LittleEndian, workingDir)
binary.Write(buf, binary.LittleEndian, arguments)
return buf.Bytes()
}
func (c *client) railStartRemoteApp() error {
c.railState = RailStateExecuteApp
clientExecute := NewRailClientExecutePDU(c.remoteApp.App, c.remoteApp.WorkingDir, c.remoteApp.Args)
return c.mcsLayer.Send(c.userID, c.channelIDMap["rail"], clientExecute.Serialize())
}
type RailPDUExecResult struct {
Flags uint16
ExecResult uint16
RawResult uint32
ExeOrFile string
}
func (pdu *RailPDUExecResult) Deserialize(wire io.Reader) error {
var err error
err = binary.Read(wire, binary.LittleEndian, &pdu.Flags)
if err != nil {
return err
}
err = binary.Read(wire, binary.LittleEndian, &pdu.ExecResult)
if err != nil {
return err
}
err = binary.Read(wire, binary.LittleEndian, &pdu.RawResult)
if err != nil {
return err
}
var padding uint16
err = binary.Read(wire, binary.LittleEndian, &padding)
if err != nil {
return err
}
var exeOrFileLength uint16
err = binary.Read(wire, binary.LittleEndian, &exeOrFileLength)
if err != nil {
return err
}
exeOrFile := make([]byte, exeOrFileLength)
_, err = wire.Read(exeOrFile)
if err != nil {
return err
}
pdu.ExeOrFile = string(exeOrFile)
return nil
}
func (c *client) railReceiveRemoteAppStatus(*RailPDU) error {
c.railState = RailStateWaitForData
// TODO: implement
return nil
}