383 lines
7.7 KiB
Go
383 lines
7.7 KiB
Go
package fwd
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import (
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"bufio"
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"context"
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"encoding/binary"
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"io"
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"log/slog"
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"net"
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"proxy-server/pkg/utils"
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"proxy-server/server/fwd/core"
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"proxy-server/server/fwd/dispatcher"
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"proxy-server/server/pkg/env"
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"strconv"
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"sync"
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"github.com/pkg/errors"
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)
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type Config struct {
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}
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type Service struct {
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Config *Config
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ctx context.Context
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cancel context.CancelFunc
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userConnMap sync.Map
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ctrlConnMap sync.Map
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fwdLesWg utils.CountWaitGroup
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ctrlConnWg utils.CountWaitGroup
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dataConnWg utils.CountWaitGroup
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userConnWg utils.CountWaitGroup
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}
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func New(config *Config) *Service {
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if config == nil {
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config = &Config{}
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}
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ctx, cancel := context.WithCancel(context.Background())
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return &Service{
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Config: config,
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ctx: ctx,
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cancel: cancel,
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userConnMap: sync.Map{},
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ctrlConnMap: sync.Map{},
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fwdLesWg: utils.CountWaitGroup{},
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ctrlConnWg: utils.CountWaitGroup{},
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dataConnWg: utils.CountWaitGroup{},
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userConnWg: utils.CountWaitGroup{},
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}
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}
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func (s *Service) Close() {
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s.cancel()
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}
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func (s *Service) Run() {
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slog.Info("启动 fwd 服务")
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errQuit := make(chan struct{})
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defer close(errQuit)
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wg := sync.WaitGroup{}
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// 控制通道监听
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wg.Add(1)
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go func() {
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defer wg.Done()
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err := s.startCtrlTun()
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if err != nil {
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slog.Error("fwd 控制通道监听发生错误", "err", err)
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errQuit <- struct{}{}
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return
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}
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}()
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// 数据通道监听
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wg.Add(1)
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go func() {
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defer wg.Done()
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err := s.startDataTun()
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if err != nil {
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slog.Error("fwd 数据通道监听发生错误", "err", err)
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errQuit <- struct{}{}
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return
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}
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}()
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// 等待退出
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select {
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case <-s.ctx.Done():
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slog.Info("fwd 服务主动退出")
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case <-errQuit:
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slog.Warn("fwd 服务异常退出")
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s.Close()
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}
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wg.Wait()
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// 协程建立有先后顺序，不能乱，否则会泄露
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s.dataConnWg.Wait()
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s.ctrlConnWg.Wait()
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s.fwdLesWg.Wait()
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s.userConnWg.Wait()
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// 清理资源
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s.userConnMap.Range(func(key, value any) bool {
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conn := value.(core.Conn)
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utils.Close(conn)
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return true
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})
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s.userConnMap.Clear()
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s.ctrlConnMap.Range(func(key, value any) bool {
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conn := value.(net.Conn)
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utils.Close(conn)
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return true
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})
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s.ctrlConnMap.Clear()
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s.ctrlConnWg.Wait()
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slog.Debug("控制通道连接已关闭")
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s.dataConnWg.Wait()
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slog.Debug("数据通道连接已关闭")
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s.fwdLesWg.Wait()
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slog.Debug("转发服务已关闭")
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wg.Wait()
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slog.Info("fwd 服务已退出")
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}
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func (s *Service) startCtrlTun() error {
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ctrlPort := env.AppCtrlPort
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slog.Debug("监听控制通道", slog.Uint64("port", uint64(ctrlPort)))
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// 监听端口
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ls, err := net.Listen("tcp", ":"+strconv.Itoa(int(ctrlPort)))
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if err != nil {
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return errors.Wrap(err, "监听控制通道失败")
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}
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defer utils.Close(ls)
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// 处理连接
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connCh := utils.ChanConnAccept(s.ctx, ls)
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for {
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select {
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case <-s.ctx.Done():
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return nil
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case conn, ok := <-connCh:
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if !ok {
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return errors.New("获取连接失败")
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}
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s.ctrlConnWg.Add(1)
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go func() {
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defer s.ctrlConnWg.Done()
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err := s.processCtrlConn(conn)
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if err != nil {
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slog.Error("处理控制通道连接失败", "err", err)
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utils.Close(conn)
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}
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}()
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}
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}
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}
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func (s *Service) processCtrlConn(conn net.Conn) error {
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slog.Debug("客户端连入", "addr", conn.RemoteAddr().String())
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reader := bufio.NewReader(conn)
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// 获取转发端口
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portBuf, err := utils.ReadBuffer(reader, 2)
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if err != nil {
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return errors.Wrap(err, "获取转发端口失败")
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}
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port := binary.BigEndian.Uint16(portBuf)
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// 开放转发端口
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s.fwdLesWg.Add(1)
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go func() {
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defer s.fwdLesWg.Done()
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err := s.startFwdTun(port)
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if err != nil {
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slog.Error("代理服务启动失败", "err", err)
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return
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}
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}()
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// 记录控制连接
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s.ctrlConnMap.Store(port, conn)
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return nil
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}
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func (s *Service) startDataTun() error {
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dataPort := env.AppDataPort
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slog.Debug("监听数据通道", slog.Uint64("port", uint64(dataPort)))
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// 监听端口
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ls, err := net.Listen("tcp", ":"+strconv.Itoa(int(dataPort)))
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if err != nil {
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return errors.Wrap(err, "监听数据通道失败")
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}
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defer utils.Close(ls)
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// 处理连接
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connCh := utils.ChanConnAccept(s.ctx, ls)
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for {
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select {
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case <-s.ctx.Done():
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return nil
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case conn, ok := <-connCh:
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if !ok {
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return errors.New("获取连接失败")
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}
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s.dataConnWg.Add(1)
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go func() {
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defer s.dataConnWg.Done()
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defer utils.Close(conn)
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err := s.processDataConn(conn)
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if err != nil {
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slog.Error("处理数据通道失败", "err", err)
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}
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}()
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}
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}
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}
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func (s *Service) processDataConn(client net.Conn) error {
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slog.Info("客户端准备接收数据 " + client.RemoteAddr().String())
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// 读取 tag
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var tag string
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select {
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case <-s.ctx.Done():
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return nil
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default:
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tagLen, err := utils.ReadByte(client)
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if err != nil {
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return errors.Wrap(err, "从客户端获取 tag 失败")
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}
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tagBuf, err := utils.ReadBuffer(client, int(tagLen))
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if err != nil {
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return errors.Wrap(err, "从客户端获取 tag 失败")
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}
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tag = string(tagBuf)
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}
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// 找到用户连接
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userAny, ok := s.userConnMap.Load(tag)
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if !ok {
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return errors.New("查找用户连接失败")
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}
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user := userAny.(*core.Conn)
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defer utils.Close(user)
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defer s.userConnMap.Delete(tag)
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// 发送目标地址
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select {
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case <-s.ctx.Done():
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return nil
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default:
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dest := user.Dest.String()
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destLen := len(dest)
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destBuf := make([]byte, 1+destLen)
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destBuf[0] = byte(destLen)
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copy(destBuf[1:], dest)
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_, err := client.Write(destBuf)
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if err != nil {
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return errors.Wrap(err, "向客户端发送目标地址失败")
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}
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}
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// 数据转发
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userPipeReader, userPipeWriter := io.Pipe()
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defer utils.Close(userPipeWriter)
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teeUser := io.TeeReader(user, userPipeWriter)
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go func() {
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err := analysisAndLog(user, userPipeReader)
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if err != nil {
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slog.Error("数据解析失败", "err", err)
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}
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}()
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wg := sync.WaitGroup{}
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wg.Add(2)
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go func() {
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defer wg.Done()
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_, err := io.Copy(client, teeUser)
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if err != nil {
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slog.Error("数据转发失败 user->client", "err", err)
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}
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}()
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go func() {
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defer wg.Done()
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_, err := io.Copy(user, client)
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if err != nil {
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if errors.Is(err, net.ErrClosed) {
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} else {
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// slog.Error("数据转发失败 client->user", "err", err, "errType", reflect.TypeOf(err))
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}
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}
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}()
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select {
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case <-s.ctx.Done():
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case <-utils.ChanWgWait(s.ctx, &wg):
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}
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return nil
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}
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func (s *Service) startFwdTun(port uint16) error {
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slog.Debug("监听转发通道", "port", port)
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proxy, err := dispatcher.New(port)
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if err != nil {
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return errors.Wrap(err, "创建 socks 转发服务失败")
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}
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defer proxy.Close()
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errCh := make(chan error)
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defer close(errCh)
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go func() {
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err := proxy.Run()
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errCh <- err
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}()
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for {
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select {
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case <-s.ctx.Done():
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return nil
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case err := <-errCh:
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if err != nil {
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return errors.Wrap(err, "转发服务发生错误")
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}
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case conn := <-proxy.Conn:
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s.userConnWg.Add(1)
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go func() {
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defer s.userConnWg.Done()
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err := s.processUserConn(conn, port)
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if err != nil {
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slog.Error("处理用户连接失败", "err", err)
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}
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}()
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}
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}
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}
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func (s *Service) processUserConn(conn *core.Conn, port uint16) error {
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// 记录用户连接
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s.userConnMap.Store(conn.Tag, conn)
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// 通知客户端建立数据通道
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ctrlConnAny, ok := s.ctrlConnMap.Load(port)
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if !ok {
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return errors.New("查找控制连接失败")
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}
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ctrlConn := ctrlConnAny.(net.Conn)
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// 发送 tag
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select {
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case <-s.ctx.Done():
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return nil
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default:
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tag := conn.Tag
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tagLen := len(tag)
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tagBuf := make([]byte, 1+tagLen)
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tagBuf[0] = byte(tagLen)
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copy(tagBuf[1:], tag)
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_, err := ctrlConn.Write(tagBuf)
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if err != nil {
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return errors.Wrap(err, "向控制通道发送 tag 失败")
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}
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}
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return nil
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}
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