mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-11-16 09:26:21 -05:00
399 lines
8.8 KiB
Go
399 lines
8.8 KiB
Go
package inbound
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import (
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"context"
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"sync"
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"sync/atomic"
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"time"
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"v2ray.com/core/app/proxyman"
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"v2ray.com/core/common"
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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/serial"
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"v2ray.com/core/common/session"
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"v2ray.com/core/common/signal/done"
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"v2ray.com/core/common/task"
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"v2ray.com/core/features/routing"
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"v2ray.com/core/features/stats"
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"v2ray.com/core/proxy"
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"v2ray.com/core/transport/internet"
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"v2ray.com/core/transport/internet/tcp"
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"v2ray.com/core/transport/internet/udp"
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"v2ray.com/core/transport/pipe"
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)
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type worker interface {
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Start() error
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Close() error
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Port() net.Port
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Proxy() proxy.Inbound
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}
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type tcpWorker struct {
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address net.Address
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port net.Port
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proxy proxy.Inbound
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stream *internet.MemoryStreamConfig
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recvOrigDest bool
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tag string
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dispatcher routing.Dispatcher
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sniffingConfig *proxyman.SniffingConfig
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uplinkCounter stats.Counter
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downlinkCounter stats.Counter
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hub internet.Listener
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}
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func getTProxyType(s *internet.MemoryStreamConfig) internet.SocketConfig_TProxyMode {
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if s == nil || s.SocketSettings == nil {
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return internet.SocketConfig_Off
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}
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return s.SocketSettings.Tproxy
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}
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func (w *tcpWorker) callback(conn internet.Connection) {
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ctx, cancel := context.WithCancel(context.Background())
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sid := session.NewID()
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ctx = session.ContextWithID(ctx, sid)
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if w.recvOrigDest {
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var dest net.Destination
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switch getTProxyType(w.stream) {
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case internet.SocketConfig_Redirect:
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d, err := tcp.GetOriginalDestination(conn)
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if err != nil {
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newError("failed to get original destination").Base(err).WriteToLog(session.ExportIDToError(ctx))
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} else {
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dest = d
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}
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case internet.SocketConfig_TProxy:
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dest = net.DestinationFromAddr(conn.LocalAddr())
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}
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if dest.IsValid() {
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ctx = session.ContextWithOutbound(ctx, &session.Outbound{
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Target: dest,
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})
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}
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}
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ctx = session.ContextWithInbound(ctx, &session.Inbound{
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Source: net.DestinationFromAddr(conn.RemoteAddr()),
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Gateway: net.TCPDestination(w.address, w.port),
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Tag: w.tag,
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})
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content := new(session.Content)
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if w.sniffingConfig != nil {
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content.SniffingRequest.Enabled = w.sniffingConfig.Enabled
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content.SniffingRequest.OverrideDestinationForProtocol = w.sniffingConfig.DestinationOverride
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}
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ctx = session.ContextWithContent(ctx, content)
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if w.uplinkCounter != nil || w.downlinkCounter != nil {
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conn = &internet.StatCouterConnection{
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Connection: conn,
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Uplink: w.uplinkCounter,
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Downlink: w.downlinkCounter,
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}
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}
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if err := w.proxy.Process(ctx, net.Network_TCP, conn, w.dispatcher); err != nil {
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newError("connection ends").Base(err).WriteToLog(session.ExportIDToError(ctx))
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}
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cancel()
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if err := conn.Close(); err != nil {
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newError("failed to close connection").Base(err).WriteToLog(session.ExportIDToError(ctx))
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}
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}
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func (w *tcpWorker) Proxy() proxy.Inbound {
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return w.proxy
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}
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func (w *tcpWorker) Start() error {
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ctx := context.Background()
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hub, err := internet.ListenTCP(ctx, w.address, w.port, w.stream, func(conn internet.Connection) {
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go w.callback(conn)
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})
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if err != nil {
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return newError("failed to listen TCP on ", w.port).AtWarning().Base(err)
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}
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w.hub = hub
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return nil
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}
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func (w *tcpWorker) Close() error {
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var errors []interface{}
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if w.hub != nil {
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if err := common.Close(w.hub); err != nil {
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errors = append(errors, err)
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}
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if err := common.Close(w.proxy); err != nil {
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errors = append(errors, err)
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}
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}
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if len(errors) > 0 {
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return newError("failed to close all resources").Base(newError(serial.Concat(errors...)))
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}
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return nil
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}
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func (w *tcpWorker) Port() net.Port {
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return w.port
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}
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type udpConn struct {
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lastActivityTime int64 // in seconds
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reader buf.Reader
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writer buf.Writer
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output func([]byte) (int, error)
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remote net.Addr
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local net.Addr
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done *done.Instance
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uplink stats.Counter
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downlink stats.Counter
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}
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func (c *udpConn) updateActivity() {
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atomic.StoreInt64(&c.lastActivityTime, time.Now().Unix())
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}
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// ReadMultiBuffer implements buf.Reader
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func (c *udpConn) ReadMultiBuffer() (buf.MultiBuffer, error) {
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mb, err := c.reader.ReadMultiBuffer()
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if err != nil {
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return nil, err
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}
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c.updateActivity()
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if c.uplink != nil {
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c.uplink.Add(int64(mb.Len()))
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}
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return mb, nil
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}
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func (c *udpConn) Read(buf []byte) (int, error) {
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panic("not implemented")
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}
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// Write implements io.Writer.
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func (c *udpConn) Write(buf []byte) (int, error) {
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n, err := c.output(buf)
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if c.downlink != nil {
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c.downlink.Add(int64(n))
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}
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if err == nil {
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c.updateActivity()
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}
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return n, err
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}
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func (c *udpConn) Close() error {
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common.Must(c.done.Close())
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common.Must(common.Close(c.writer))
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return nil
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}
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func (c *udpConn) RemoteAddr() net.Addr {
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return c.remote
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}
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func (c *udpConn) LocalAddr() net.Addr {
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return c.remote
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}
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func (*udpConn) SetDeadline(time.Time) error {
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return nil
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}
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func (*udpConn) SetReadDeadline(time.Time) error {
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return nil
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}
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func (*udpConn) SetWriteDeadline(time.Time) error {
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return nil
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}
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type connID struct {
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src net.Destination
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dest net.Destination
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}
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type udpWorker struct {
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sync.RWMutex
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proxy proxy.Inbound
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hub *udp.Hub
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address net.Address
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port net.Port
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tag string
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stream *internet.MemoryStreamConfig
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dispatcher routing.Dispatcher
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uplinkCounter stats.Counter
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downlinkCounter stats.Counter
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checker *task.Periodic
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activeConn map[connID]*udpConn
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}
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func (w *udpWorker) getConnection(id connID) (*udpConn, bool) {
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w.Lock()
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defer w.Unlock()
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if conn, found := w.activeConn[id]; found && !conn.done.Done() {
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return conn, true
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}
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pReader, pWriter := pipe.New(pipe.DiscardOverflow(), pipe.WithSizeLimit(16*1024))
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conn := &udpConn{
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reader: pReader,
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writer: pWriter,
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output: func(b []byte) (int, error) {
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return w.hub.WriteTo(b, id.src)
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},
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remote: &net.UDPAddr{
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IP: id.src.Address.IP(),
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Port: int(id.src.Port),
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},
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local: &net.UDPAddr{
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IP: w.address.IP(),
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Port: int(w.port),
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},
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done: done.New(),
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uplink: w.uplinkCounter,
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downlink: w.downlinkCounter,
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}
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w.activeConn[id] = conn
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conn.updateActivity()
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return conn, false
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}
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func (w *udpWorker) callback(b *buf.Buffer, source net.Destination, originalDest net.Destination) {
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id := connID{
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src: source,
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}
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if originalDest.IsValid() {
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id.dest = originalDest
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}
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conn, existing := w.getConnection(id)
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// payload will be discarded in pipe is full.
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conn.writer.WriteMultiBuffer(buf.MultiBuffer{b}) // nolint: errcheck
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if !existing {
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common.Must(w.checker.Start())
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go func() {
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ctx := context.Background()
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sid := session.NewID()
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ctx = session.ContextWithID(ctx, sid)
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if originalDest.IsValid() {
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ctx = session.ContextWithOutbound(ctx, &session.Outbound{
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Target: originalDest,
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})
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}
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ctx = session.ContextWithInbound(ctx, &session.Inbound{
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Source: source,
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Gateway: net.UDPDestination(w.address, w.port),
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Tag: w.tag,
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})
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if err := w.proxy.Process(ctx, net.Network_UDP, conn, w.dispatcher); err != nil {
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newError("connection ends").Base(err).WriteToLog(session.ExportIDToError(ctx))
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}
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conn.Close() // nolint: errcheck
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w.removeConn(id)
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}()
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}
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}
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func (w *udpWorker) removeConn(id connID) {
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w.Lock()
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delete(w.activeConn, id)
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w.Unlock()
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}
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func (w *udpWorker) handlePackets() {
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receive := w.hub.Receive()
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for payload := range receive {
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w.callback(payload.Payload, payload.Source, payload.Target)
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}
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}
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func (w *udpWorker) clean() error {
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nowSec := time.Now().Unix()
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w.Lock()
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defer w.Unlock()
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if len(w.activeConn) == 0 {
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return newError("no more connections. stopping...")
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}
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for addr, conn := range w.activeConn {
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if nowSec-atomic.LoadInt64(&conn.lastActivityTime) > 8 {
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delete(w.activeConn, addr)
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conn.Close() // nolint: errcheck
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}
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}
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if len(w.activeConn) == 0 {
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w.activeConn = make(map[connID]*udpConn, 16)
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}
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return nil
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}
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func (w *udpWorker) Start() error {
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w.activeConn = make(map[connID]*udpConn, 16)
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ctx := context.Background()
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h, err := udp.ListenUDP(ctx, w.address, w.port, w.stream, udp.HubCapacity(256))
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if err != nil {
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return err
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}
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w.checker = &task.Periodic{
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Interval: time.Second * 16,
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Execute: w.clean,
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}
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w.hub = h
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go w.handlePackets()
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return nil
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}
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func (w *udpWorker) Close() error {
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w.Lock()
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defer w.Unlock()
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var errors []interface{}
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if w.hub != nil {
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if err := w.hub.Close(); err != nil {
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errors = append(errors, err)
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}
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}
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if w.checker != nil {
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if err := w.checker.Close(); err != nil {
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errors = append(errors, err)
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}
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}
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if err := common.Close(w.proxy); err != nil {
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errors = append(errors, err)
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}
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if len(errors) > 0 {
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return newError("failed to close all resources").Base(newError(serial.Concat(errors...)))
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}
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return nil
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}
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func (w *udpWorker) Port() net.Port {
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return w.port
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}
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func (w *udpWorker) Proxy() proxy.Inbound {
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return w.proxy
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}
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