/
wine.go
380 lines (307 loc) · 7.88 KB
/
wine.go
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//go:build linux && amd64
package implementations
import (
"bytes"
"debug/pe"
"encoding/binary"
"fmt"
"io"
"log/slog"
"os"
"os/exec"
"sync"
"syscall"
"github.com/brunoga/unitybridge/support/logger"
"github.com/brunoga/unitybridge/wrapper/callback"
internal_callback "github.com/brunoga/unitybridge/wrapper/internal/callback"
"github.com/brunoga/unitybridge/wrapper/internal/implementations/support"
)
const (
dllHostExe = "dllhost.exe"
)
var (
UnityBridgeImpl *wineUnityBridgeImpl = &wineUnityBridgeImpl{}
localReadPipe *os.File
localWritePipe *os.File
localEventPipe *os.File
once sync.Once
)
type wineUnityBridgeImpl struct {
l *logger.Logger
m *internal_callback.Manager
}
func Get(l *logger.Logger) *wineUnityBridgeImpl {
if l == nil {
l = logger.New(slog.LevelError)
}
once.Do(func() {
// Check if wine is available.
winePath, err := getWinePath()
if err != nil {
panic(err)
}
// Check if dllhost.exe is available and is a Windows executable.
dllHostPath, err := getDLLHostPath()
if err != nil {
panic(err)
}
var remoteWritePipe *os.File
localReadPipe, remoteWritePipe, err = os.Pipe()
if err != nil {
panic(err)
}
var remoteReadPipe *os.File
remoteReadPipe, localWritePipe, err = os.Pipe()
if err != nil {
panic(err)
}
var remoteEventPipe *os.File
localEventPipe, remoteEventPipe, err = os.Pipe()
if err != nil {
panic(err)
}
err = startDllHost(winePath, dllHostPath, remoteReadPipe, remoteWritePipe,
remoteEventPipe, l.Level())
if err != nil {
panic(err)
}
go loop(internal_callback.NewManager(l))
})
UnityBridgeImpl.l = l
UnityBridgeImpl.m = internal_callback.NewManager(l)
return UnityBridgeImpl
}
func sendRequest(function byte, data *bytes.Buffer) ([]byte, error) {
// Write function identifier
_, err := localWritePipe.Write([]byte{function})
if err != nil {
return nil, err
}
if data != nil {
// Write total data len.
err = writeSize(localWritePipe, uint32(data.Len()))
if err != nil {
return nil, err
}
// Write data.
_, err = localWritePipe.Write(data.Bytes())
if err != nil {
return nil, err
}
} else {
err = writeSize(localWritePipe, 0)
if err != nil {
return nil, err
}
}
// Read response header.
headerBuf := make([]byte, 1+4)
_, err = io.ReadFull(localReadPipe, headerBuf)
if err != nil {
return nil, err
}
// Check function identifier.
if headerBuf[0] != function {
return nil, fmt.Errorf("unexpected function identifier: %d",
headerBuf[0])
}
// Read response length.
length := binary.BigEndian.Uint32(headerBuf[1:5])
if length > 0 {
// Read response data.
response := make([]byte, length)
_, err = io.ReadFull(localReadPipe, response)
if err != nil {
return nil, err
}
return response, nil
}
return nil, nil
}
func (u *wineUnityBridgeImpl) Create(name string, debuggable bool,
logPath string) {
var b bytes.Buffer
if debuggable {
b.WriteByte(1)
} else {
b.WriteByte(0)
}
writeSize(&b, uint32(len(name)))
b.WriteString(name)
writeSize(&b, uint32(len(logPath)))
b.WriteString(logPath)
_, err := sendRequest(0x00, &b)
if err != nil {
panic(err)
}
}
func (u *wineUnityBridgeImpl) Destroy() {
_, err := sendRequest(0x01, nil)
if err != nil {
panic(err)
}
}
func (u *wineUnityBridgeImpl) Initialize() bool {
res, err := sendRequest(0x02, nil)
if err != nil {
panic(err)
}
return res[0] != 0
}
func (u *wineUnityBridgeImpl) Uninitialize() {
_, err := sendRequest(0x03, nil)
if err != nil {
panic(err)
}
}
func (u *wineUnityBridgeImpl) SendEvent(eventCode uint64, output []byte,
tag uint64) {
var b bytes.Buffer
binary.Write(&b, binary.BigEndian, eventCode)
binary.Write(&b, binary.BigEndian, tag)
writeSize(&b, uint32(len(output)))
res, err := sendRequest(0x04, &b)
if err != nil {
panic(err)
}
copy(output, res)
}
func (u *wineUnityBridgeImpl) SendEventWithString(eventCode uint64, data string,
tag uint64) {
var b bytes.Buffer
binary.Write(&b, binary.BigEndian, eventCode)
binary.Write(&b, binary.BigEndian, tag)
writeSize(&b, uint32(len(data)))
b.WriteString(data)
_, err := sendRequest(0x05, &b)
if err != nil {
panic(err)
}
}
func (u *wineUnityBridgeImpl) SendEventWithNumber(eventCode uint64, data uint64,
tag uint64) {
var b bytes.Buffer
binary.Write(&b, binary.BigEndian, eventCode)
binary.Write(&b, binary.BigEndian, tag)
binary.Write(&b, binary.BigEndian, data)
_, err := sendRequest(0x06, &b)
if err != nil {
panic(err)
}
}
func (u *wineUnityBridgeImpl) SetEventCallback(eventTypeCode uint64,
c callback.Callback) {
var b bytes.Buffer
binary.Write(&b, binary.BigEndian, eventTypeCode)
binary.Write(&b, binary.BigEndian, c != nil)
_, err := sendRequest(0x07, &b)
if err != nil {
panic(err)
}
u.m.Set(eventTypeCode, c)
}
func (u *wineUnityBridgeImpl) GetSecurityKeyByKeyChainIndex(index int) string {
var b bytes.Buffer
binary.Write(&b, binary.BigEndian, uint64(index))
res, err := sendRequest(0x08, &b)
if err != nil {
panic(err)
}
return string(res)
}
func getWinePath() (string, error) {
return exec.LookPath("wine")
}
func getDLLHostPath() (string, error) {
dllHostPath := support.FindFile(dllHostExe)
peFile, err := pe.Open(dllHostPath)
if err != nil {
return "", fmt.Errorf("%q does not look like a Windows executable: %w",
dllHostPath, err)
}
peFile.Close()
return dllHostPath, nil
}
func startDllHost(winePath, dllHostPath string, remoteReadPipe,
remoteWritePipe, remoteEventPipe *os.File, level slog.Level) error {
argv := []string{
winePath,
dllHostPath,
"-read-fd",
fmt.Sprintf("%d", getFd(remoteReadPipe)),
"-write-fd",
fmt.Sprintf("%d", getFd(remoteWritePipe)),
"-event-fd",
fmt.Sprintf("%d", getFd(remoteEventPipe)),
"-loglevel",
fmt.Sprintf("%d", level),
}
// Disable close on exec for the pipes.
disableCloseOnExec(remoteReadPipe)
disableCloseOnExec(remoteWritePipe)
disableCloseOnExec(remoteEventPipe)
_, err := syscall.ForkExec(winePath, argv,
&syscall.ProcAttr{
Files: []uintptr{
getFd(os.Stdin),
getFd(os.Stdout),
getFd(os.Stderr),
},
Sys: &syscall.SysProcAttr{
Foreground: false,
},
Env: []string{
"WINEDEBUG=-all",
},
},
)
if err != nil {
return fmt.Errorf("error executing windows program: %w", err)
}
remoteReadPipe.Close()
remoteWritePipe.Close()
remoteEventPipe.Close()
return nil
}
func disableCloseOnExec(file *os.File) {
_, _, err := syscall.Syscall(syscall.SYS_FCNTL, getFd(file),
syscall.F_SETFD, 0)
if err != syscall.Errno(0) {
panic(fmt.Sprintf("Error disabling close on exec: %s", err))
}
}
func getFd(file *os.File) uintptr {
rawConn, err := file.SyscallConn()
if err != nil {
panic(fmt.Sprintf("Error getting raw connection "+
"for file: %s", err))
}
var fileFd uintptr
err = rawConn.Control(func(fd uintptr) {
fileFd = fd
})
if err != nil {
panic(fmt.Sprintf("Error controlling raw "+
"connection: %s", err))
}
return fileFd
}
func loop(m *internal_callback.Manager) {
headerBuf := make([]byte, 20)
for {
if _, err := io.ReadFull(localEventPipe, headerBuf); err != nil {
panic(fmt.Sprintf("Error reading data: %s", err))
}
eventCode := binary.BigEndian.Uint64(headerBuf[0:8])
tag := binary.BigEndian.Uint64(headerBuf[8:16])
length := binary.BigEndian.Uint32(headerBuf[16:20])
data := make([]byte, length)
if _, err := io.ReadFull(localEventPipe, data); err != nil {
panic(fmt.Sprintf("Error reading data: %s", err))
}
m.Run(eventCode, data, tag)
}
}
func writeSize(w io.Writer, size uint32) error {
return binary.Write(w, binary.BigEndian, size)
}