364 lines
7.3 KiB
Go
364 lines
7.3 KiB
Go
package fwd
|
|
|
|
import (
|
|
"bufio"
|
|
"context"
|
|
"encoding/binary"
|
|
"io"
|
|
"log/slog"
|
|
"net"
|
|
"proxy-server/pkg/utils"
|
|
"proxy-server/server/fwd/core"
|
|
"proxy-server/server/fwd/dispatcher"
|
|
"proxy-server/server/pkg/env"
|
|
"strconv"
|
|
"strings"
|
|
"sync"
|
|
|
|
"github.com/pkg/errors"
|
|
)
|
|
|
|
type Config struct {
|
|
}
|
|
|
|
type Service struct {
|
|
Config *Config
|
|
ctx context.Context
|
|
cancel context.CancelFunc
|
|
|
|
userConnMap sync.Map
|
|
|
|
fwdLesWg utils.CountWaitGroup
|
|
ctrlConnWg utils.CountWaitGroup
|
|
dataConnWg utils.CountWaitGroup
|
|
userConnWg utils.CountWaitGroup
|
|
}
|
|
|
|
func New(config *Config) *Service {
|
|
if config == nil {
|
|
config = &Config{}
|
|
}
|
|
|
|
ctx, cancel := context.WithCancel(context.Background())
|
|
return &Service{
|
|
Config: config,
|
|
ctx: ctx,
|
|
cancel: cancel,
|
|
|
|
userConnMap: sync.Map{},
|
|
|
|
fwdLesWg: utils.CountWaitGroup{},
|
|
ctrlConnWg: utils.CountWaitGroup{},
|
|
dataConnWg: utils.CountWaitGroup{},
|
|
userConnWg: utils.CountWaitGroup{},
|
|
}
|
|
}
|
|
|
|
func (s *Service) Close() {
|
|
s.cancel()
|
|
}
|
|
|
|
func (s *Service) Run() {
|
|
slog.Info("启动 fwd 服务")
|
|
|
|
errQuit := make(chan struct{})
|
|
defer close(errQuit)
|
|
|
|
wg := sync.WaitGroup{}
|
|
|
|
// 控制通道监听
|
|
wg.Add(1)
|
|
go func() {
|
|
defer wg.Done()
|
|
err := s.startCtrlTun()
|
|
if err != nil {
|
|
slog.Error("fwd 控制通道监听发生错误", "err", err)
|
|
errQuit <- struct{}{}
|
|
return
|
|
}
|
|
}()
|
|
|
|
// 数据通道监听
|
|
wg.Add(1)
|
|
go func() {
|
|
defer wg.Done()
|
|
err := s.startDataTun()
|
|
if err != nil {
|
|
slog.Error("fwd 数据通道监听发生错误", "err", err)
|
|
errQuit <- struct{}{}
|
|
return
|
|
}
|
|
}()
|
|
|
|
// 等待退出
|
|
select {
|
|
case <-s.ctx.Done():
|
|
slog.Info("fwd 服务主动退出")
|
|
case <-errQuit:
|
|
slog.Warn("fwd 服务异常退出")
|
|
s.Close()
|
|
}
|
|
|
|
wg.Wait()
|
|
s.dataConnWg.Wait()
|
|
s.ctrlConnWg.Wait()
|
|
s.fwdLesWg.Wait()
|
|
s.userConnWg.Wait()
|
|
|
|
// 清理资源
|
|
s.userConnMap.Range(func(key, value any) bool {
|
|
conn := value.(*core.Conn)
|
|
utils.Close(conn)
|
|
return true
|
|
})
|
|
s.userConnMap.Clear()
|
|
|
|
s.ctrlConnWg.Wait()
|
|
slog.Debug("控制通道连接已关闭")
|
|
s.dataConnWg.Wait()
|
|
slog.Debug("数据通道连接已关闭")
|
|
s.fwdLesWg.Wait()
|
|
slog.Debug("转发服务已关闭")
|
|
wg.Wait()
|
|
slog.Info("fwd 服务已退出")
|
|
}
|
|
|
|
func (s *Service) startCtrlTun() error {
|
|
ctrlPort := env.AppCtrlPort
|
|
slog.Debug("监听控制通道", slog.Uint64("port", uint64(ctrlPort)))
|
|
|
|
// 监听端口
|
|
ls, err := net.Listen("tcp", ":"+strconv.Itoa(int(ctrlPort)))
|
|
if err != nil {
|
|
return errors.Wrap(err, "监听控制通道失败")
|
|
}
|
|
defer utils.Close(ls)
|
|
|
|
// 处理连接
|
|
connCh := utils.ChanConnAccept(s.ctx, ls)
|
|
for {
|
|
select {
|
|
case <-s.ctx.Done():
|
|
return nil
|
|
case conn, ok := <-connCh:
|
|
if !ok {
|
|
return errors.New("获取连接失败")
|
|
}
|
|
s.ctrlConnWg.Add(1)
|
|
go func() {
|
|
defer s.ctrlConnWg.Done()
|
|
err := s.processCtrlConn(conn)
|
|
if err != nil {
|
|
slog.Error("处理控制通道连接失败", "err", err)
|
|
utils.Close(conn)
|
|
}
|
|
}()
|
|
}
|
|
}
|
|
}
|
|
|
|
func (s *Service) processCtrlConn(conn net.Conn) error {
|
|
reader := bufio.NewReader(conn)
|
|
|
|
// 获取转发端口
|
|
portBuf, err := utils.ReadBuffer(reader, 2)
|
|
if err != nil {
|
|
return errors.Wrap(err, "获取转发端口失败")
|
|
}
|
|
port := binary.BigEndian.Uint16(portBuf)
|
|
|
|
slog.Info("客户端注册", "addr", conn.RemoteAddr().String(), "port", port)
|
|
|
|
// 启动转发服务
|
|
proxy, err := dispatcher.New(port)
|
|
if err != nil {
|
|
return errors.Wrap(err, "创建 socks 转发服务失败")
|
|
}
|
|
defer proxy.Close()
|
|
|
|
s.fwdLesWg.Add(1)
|
|
go func() {
|
|
defer s.fwdLesWg.Done()
|
|
err := proxy.Run()
|
|
if err != nil {
|
|
slog.Error("代理服务运行失败", "err", err)
|
|
return
|
|
}
|
|
}()
|
|
|
|
// 监听客户端连接
|
|
errCh := make(chan error)
|
|
defer close(errCh)
|
|
go func() {
|
|
_, err := reader.ReadByte()
|
|
errCh <- err
|
|
}()
|
|
|
|
// 处理连接
|
|
for {
|
|
select {
|
|
case <-s.ctx.Done():
|
|
return nil
|
|
case err := <-errCh:
|
|
switch {
|
|
case strings.Contains(err.Error(), "An existing connection was forcibly closed by the remote host."):
|
|
slog.Debug("客户端主动断开连接")
|
|
return nil
|
|
case err == nil:
|
|
return errors.New("客户端握手失败")
|
|
default:
|
|
return errors.Wrap(err, "客户端意外断开连接")
|
|
}
|
|
case user := <-proxy.Conn:
|
|
s.userConnWg.Add(1)
|
|
go func() {
|
|
defer s.userConnWg.Done()
|
|
err := s.processUserConn(user, conn)
|
|
if err != nil {
|
|
slog.Error("处理用户连接失败", "err", err)
|
|
utils.Close(user)
|
|
}
|
|
}()
|
|
}
|
|
}
|
|
}
|
|
|
|
func (s *Service) startDataTun() error {
|
|
dataPort := env.AppDataPort
|
|
slog.Debug("监听数据通道", slog.Uint64("port", uint64(dataPort)))
|
|
|
|
// 监听端口
|
|
ls, err := net.Listen("tcp", ":"+strconv.Itoa(int(dataPort)))
|
|
if err != nil {
|
|
return errors.Wrap(err, "监听数据通道失败")
|
|
}
|
|
defer utils.Close(ls)
|
|
|
|
// 处理连接
|
|
connCh := utils.ChanConnAccept(s.ctx, ls)
|
|
for {
|
|
select {
|
|
case <-s.ctx.Done():
|
|
return nil
|
|
case conn, ok := <-connCh:
|
|
if !ok {
|
|
return errors.New("获取连接失败")
|
|
}
|
|
s.dataConnWg.Add(1)
|
|
go func() {
|
|
defer s.dataConnWg.Done()
|
|
defer utils.Close(conn)
|
|
err := s.processDataConn(conn)
|
|
if err != nil {
|
|
slog.Error("处理数据通道失败", "err", err)
|
|
}
|
|
}()
|
|
}
|
|
}
|
|
}
|
|
|
|
func (s *Service) processDataConn(client net.Conn) error {
|
|
slog.Info("客户端准备接收数据 " + client.RemoteAddr().String())
|
|
|
|
// 读取 tag
|
|
var tag string
|
|
select {
|
|
case <-s.ctx.Done():
|
|
return nil
|
|
default:
|
|
tagLen, err := utils.ReadByte(client)
|
|
if err != nil {
|
|
return errors.Wrap(err, "从客户端获取 tag 失败")
|
|
}
|
|
tagBuf, err := utils.ReadBuffer(client, int(tagLen))
|
|
if err != nil {
|
|
return errors.Wrap(err, "从客户端获取 tag 失败")
|
|
}
|
|
tag = string(tagBuf)
|
|
}
|
|
|
|
// 找到用户连接
|
|
userAny, ok := s.userConnMap.Load(tag)
|
|
if !ok {
|
|
return errors.New("查找用户连接失败")
|
|
}
|
|
user := userAny.(*core.Conn)
|
|
defer utils.Close(user)
|
|
defer s.userConnMap.Delete(tag)
|
|
|
|
// 发送目标地址
|
|
select {
|
|
case <-s.ctx.Done():
|
|
return nil
|
|
default:
|
|
dest := user.Dest.String()
|
|
destLen := len(dest)
|
|
destBuf := make([]byte, 1+destLen)
|
|
destBuf[0] = byte(destLen)
|
|
copy(destBuf[1:], dest)
|
|
_, err := client.Write(destBuf)
|
|
if err != nil {
|
|
return errors.Wrap(err, "向客户端发送目标地址失败")
|
|
}
|
|
}
|
|
|
|
// 数据转发
|
|
userPipeReader, userPipeWriter := io.Pipe()
|
|
defer utils.Close(userPipeWriter)
|
|
teeUser := io.TeeReader(user, userPipeWriter)
|
|
go func() {
|
|
err := analysisAndLog(user, userPipeReader)
|
|
if err != nil {
|
|
slog.Error("数据解析失败", "err", err)
|
|
}
|
|
}()
|
|
|
|
wg := sync.WaitGroup{}
|
|
wg.Add(2)
|
|
go func() {
|
|
defer wg.Done()
|
|
_, err := io.Copy(client, teeUser)
|
|
if err != nil {
|
|
slog.Error("数据转发失败 user->client", "err", err)
|
|
}
|
|
}()
|
|
go func() {
|
|
defer wg.Done()
|
|
_, err := io.Copy(user, client)
|
|
if err != nil {
|
|
if errors.Is(err, net.ErrClosed) {
|
|
|
|
} else {
|
|
// slog.Error("数据转发失败 client->user", "err", err, "errType", reflect.TypeOf(err))
|
|
}
|
|
}
|
|
}()
|
|
|
|
select {
|
|
case <-s.ctx.Done():
|
|
case <-utils.ChanWgWait(s.ctx, &wg):
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (s *Service) processUserConn(user *core.Conn, ctrl net.Conn) error {
|
|
|
|
// 发送 tag
|
|
tag := user.Tag
|
|
tagLen := len(tag)
|
|
tagBuf := make([]byte, 1+tagLen)
|
|
tagBuf[0] = byte(tagLen)
|
|
copy(tagBuf[1:], tag)
|
|
|
|
_, err := ctrl.Write(tagBuf)
|
|
if err != nil {
|
|
return errors.Wrap(err, "向控制通道发送 tag 失败")
|
|
}
|
|
|
|
// 记录用户连接
|
|
s.userConnMap.Store(user.Tag, user)
|
|
|
|
return nil
|
|
}
|