mirror of https://github.com/v2ray/v2ray-core
111 lines
2.4 KiB
Go
111 lines
2.4 KiB
Go
package tcp
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import (
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"context"
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"fmt"
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"io"
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"v2ray.com/core/common/buf"
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"v2ray.com/core/common/net"
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"v2ray.com/core/common/task"
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"v2ray.com/core/transport/internet"
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"v2ray.com/core/transport/pipe"
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)
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type Server struct {
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Port net.Port
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MsgProcessor func(msg []byte) []byte
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ShouldClose bool
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SendFirst []byte
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Listen net.Address
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listener net.Listener
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}
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func (server *Server) Start() (net.Destination, error) {
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return server.StartContext(context.Background(), nil)
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}
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func (server *Server) StartContext(ctx context.Context, sockopt *internet.SocketConfig) (net.Destination, error) {
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listenerAddr := server.Listen
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if listenerAddr == nil {
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listenerAddr = net.LocalHostIP
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}
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listener, err := internet.ListenSystem(ctx, &net.TCPAddr{
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IP: listenerAddr.IP(),
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Port: int(server.Port),
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}, sockopt)
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if err != nil {
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return net.Destination{}, err
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}
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localAddr := listener.Addr().(*net.TCPAddr)
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server.Port = net.Port(localAddr.Port)
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server.listener = listener
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go server.acceptConnections(listener.(*net.TCPListener))
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return net.TCPDestination(net.IPAddress(localAddr.IP), net.Port(localAddr.Port)), nil
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}
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func (server *Server) acceptConnections(listener *net.TCPListener) {
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for {
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conn, err := listener.Accept()
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if err != nil {
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fmt.Printf("Failed accept TCP connection: %v\n", err)
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return
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}
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go server.handleConnection(conn)
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}
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}
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func (server *Server) handleConnection(conn net.Conn) {
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if len(server.SendFirst) > 0 {
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conn.Write(server.SendFirst)
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}
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pReader, pWriter := pipe.New(pipe.WithoutSizeLimit())
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err := task.Run(context.Background(), func() error {
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defer pWriter.Close() // nolint: errcheck
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for {
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b := buf.New()
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if _, err := b.ReadFrom(conn); err != nil {
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if err == io.EOF {
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return nil
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}
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return err
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}
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copy(b.Bytes(), server.MsgProcessor(b.Bytes()))
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if err := pWriter.WriteMultiBuffer(buf.MultiBuffer{b}); err != nil {
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return err
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}
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}
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}, func() error {
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defer pReader.Interrupt()
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w := buf.NewWriter(conn)
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for {
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mb, err := pReader.ReadMultiBuffer()
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if err != nil {
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if err == io.EOF {
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return nil
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}
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return err
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}
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if err := w.WriteMultiBuffer(mb); err != nil {
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return err
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}
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}
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})
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if err != nil {
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fmt.Println("failed to transfer data: ", err.Error())
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}
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conn.Close() // nolint: errcheck
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}
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func (server *Server) Close() error {
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return server.listener.Close()
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}
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