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server.go
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server.go
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package transport
import (
"bufio"
"context"
"net"
"net/http"
"os"
"os/exec"
"strconv"
"sync"
"time"
"github.com/Potterli20/trojan-go-fork/common"
"github.com/Potterli20/trojan-go-fork/config"
"github.com/Potterli20/trojan-go-fork/log"
"github.com/Potterli20/trojan-go-fork/tunnel"
"github.com/database64128/tfo-go/v2"
)
// Server is a server of transport layer
type Server struct {
tcpListener net.Listener
cmd *exec.Cmd
connChan chan tunnel.Conn
wsChan chan tunnel.Conn
httpLock sync.RWMutex
nextHTTP bool
ctx context.Context
cancel context.CancelFunc
}
func (s *Server) Close() error {
s.cancel()
if s.cmd != nil && s.cmd.Process != nil {
s.cmd.Process.Kill()
}
return s.tcpListener.Close()
}
func (s *Server) acceptLoop() {
for {
tcpConn, err := s.tcpListener.Accept()
if err != nil {
select {
case <-s.ctx.Done():
default:
log.Error(common.NewError("transport accept error").Base(err))
time.Sleep(time.Millisecond * 100)
}
return
}
go func(tcpConn net.Conn) {
log.Debug("tcp connection from", tcpConn.RemoteAddr())
s.httpLock.RLock()
if s.nextHTTP { // plaintext mode enabled
s.httpLock.RUnlock()
// we use real http header parser to mimic a real http server
rewindConn := common.NewRewindConn(tcpConn)
rewindConn.SetBufferSize(512)
defer rewindConn.StopBuffering()
r := bufio.NewReader(rewindConn)
httpReq, err := http.ReadRequest(r)
rewindConn.Rewind()
rewindConn.StopBuffering()
if err != nil {
// this is not a http request, pass it to trojan protocol layer for further inspection
s.connChan <- &Conn{
Conn: rewindConn,
}
} else {
// this is a http request, pass it to websocket protocol layer
log.Debug("plaintext http request: ", httpReq)
s.wsChan <- &Conn{
Conn: rewindConn,
}
}
} else {
s.httpLock.RUnlock()
s.connChan <- &Conn{
Conn: tcpConn,
}
}
}(tcpConn)
}
}
func (s *Server) AcceptConn(overlay tunnel.Tunnel) (tunnel.Conn, error) {
// TODO fix import cycle
if overlay != nil && (overlay.Name() == "WEBSOCKET" || overlay.Name() == "HTTP") {
s.httpLock.Lock()
s.nextHTTP = true
s.httpLock.Unlock()
select {
case conn := <-s.wsChan:
return conn, nil
case <-s.ctx.Done():
return nil, common.NewError("transport server closed")
}
}
select {
case conn := <-s.connChan:
return conn, nil
case <-s.ctx.Done():
return nil, common.NewError("transport server closed")
}
}
func (s *Server) AcceptPacket(tunnel.Tunnel) (tunnel.PacketConn, error) {
panic("not supported")
}
// NewServer creates a transport layer server
func NewServer(ctx context.Context, _ tunnel.Server) (*Server, error) {
cfg := config.FromContext(ctx, Name).(*Config)
listenAddress := tunnel.NewAddressFromHostPort("tcp", cfg.LocalHost, cfg.LocalPort)
var cmd *exec.Cmd
if cfg.TransportPlugin.Enabled {
log.Warn("transport server will use plugin and work in plain text mode")
switch cfg.TransportPlugin.Type {
case "shadowsocks":
trojanHost := "127.0.0.1"
trojanPort := common.PickPort("tcp", trojanHost)
cfg.TransportPlugin.Env = append(
cfg.TransportPlugin.Env,
"SS_REMOTE_HOST="+cfg.LocalHost,
"SS_REMOTE_PORT="+strconv.FormatInt(int64(cfg.LocalPort), 10),
"SS_LOCAL_HOST="+trojanHost,
"SS_LOCAL_PORT="+strconv.FormatInt(int64(trojanPort), 10),
"SS_PLUGIN_OPTIONS="+cfg.TransportPlugin.Option,
)
cfg.LocalHost = trojanHost
cfg.LocalPort = trojanPort
listenAddress = tunnel.NewAddressFromHostPort("tcp", cfg.LocalHost, cfg.LocalPort)
log.Debug("new listen address", listenAddress)
log.Debug("plugin env", cfg.TransportPlugin.Env)
cmd = exec.Command(cfg.TransportPlugin.Command, cfg.TransportPlugin.Arg...)
cmd.Env = append(cmd.Env, cfg.TransportPlugin.Env...)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stdout
cmd.Start()
case "other":
cmd = exec.Command(cfg.TransportPlugin.Command, cfg.TransportPlugin.Arg...)
cmd.Env = append(cmd.Env, cfg.TransportPlugin.Env...)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stdout
cmd.Start()
case "plaintext":
// do nothing
default:
return nil, common.NewError("invalid plugin type: " + cfg.TransportPlugin.Type)
}
}
tcpListener, err := tfo.Listen("tcp", listenAddress.String())
if err != nil {
return nil, err
}
ctx, cancel := context.WithCancel(ctx)
server := &Server{
tcpListener: tcpListener,
cmd: cmd,
ctx: ctx,
cancel: cancel,
connChan: make(chan tunnel.Conn, 32),
wsChan: make(chan tunnel.Conn, 32),
}
go server.acceptLoop()
return server, nil
}