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329 lines
8.7 KiB
Go
329 lines
8.7 KiB
Go
// Copyright 2017 fatedier, fatedier@gmail.com
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package visitor
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import (
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"context"
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"fmt"
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"io"
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"net"
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"strconv"
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"sync"
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"time"
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frpIo "github.com/fatedier/golib/io"
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fmux "github.com/hashicorp/yamux"
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quic "github.com/quic-go/quic-go"
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"github.com/fatedier/frp/pkg/config"
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"github.com/fatedier/frp/pkg/msg"
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"github.com/fatedier/frp/pkg/nathole"
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"github.com/fatedier/frp/pkg/transport"
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frpNet "github.com/fatedier/frp/pkg/util/net"
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"github.com/fatedier/frp/pkg/util/util"
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"github.com/fatedier/frp/pkg/util/xlog"
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)
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type XTCPVisitor struct {
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*BaseVisitor
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kcpSession *fmux.Session
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quicSession quic.Connection
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startTunnelCh chan struct{}
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mu sync.RWMutex
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cancel context.CancelFunc
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cfg *config.XTCPVisitorConf
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}
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func (sv *XTCPVisitor) Run() (err error) {
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sv.ctx, sv.cancel = context.WithCancel(sv.ctx)
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sv.l, err = net.Listen("tcp", net.JoinHostPort(sv.cfg.BindAddr, strconv.Itoa(sv.cfg.BindPort)))
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if err != nil {
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return
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}
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go sv.worker()
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go sv.keepTunnelConnection()
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return
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}
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func (sv *XTCPVisitor) Close() {
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sv.l.Close()
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sv.cancel()
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if sv.kcpSession != nil {
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sv.kcpSession.Close()
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}
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if sv.quicSession != nil {
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_ = sv.quicSession.CloseWithError(0, "")
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}
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}
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func (sv *XTCPVisitor) worker() {
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xl := xlog.FromContextSafe(sv.ctx)
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for {
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conn, err := sv.l.Accept()
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if err != nil {
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xl.Warn("xtcp local listener closed")
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return
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}
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go sv.handleConn(conn)
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}
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}
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func (sv *XTCPVisitor) keepTunnelConnection() {
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for {
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select {
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case <-sv.ctx.Done():
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return
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case <-sv.startTunnelCh:
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start := time.Now()
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sv.makeNatHole()
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duration := time.Since(start)
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// avoid too frequently
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if duration < 10*time.Second {
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time.Sleep(10*time.Second - duration)
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}
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}
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}
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}
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func (sv *XTCPVisitor) handleConn(userConn net.Conn) {
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xl := xlog.FromContextSafe(sv.ctx)
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defer userConn.Close()
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xl.Debug("get a new xtcp user connection")
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// Open a tunnel connection to the server. If there is already a successful hole-punching connection,
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// it will be reused. Otherwise, it will block and wait for a successful hole-punching connection until timeout.
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tunnelConn, err := sv.openTunnel()
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if err != nil {
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xl.Error("open tunnel error: %v", err)
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return
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}
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var muxConnRWCloser io.ReadWriteCloser = tunnelConn
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if sv.cfg.UseEncryption {
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muxConnRWCloser, err = frpIo.WithEncryption(muxConnRWCloser, []byte(sv.cfg.Sk))
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if err != nil {
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xl.Error("create encryption stream error: %v", err)
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return
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}
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}
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if sv.cfg.UseCompression {
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muxConnRWCloser = frpIo.WithCompression(muxConnRWCloser)
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}
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_, _, errs := frpIo.Join(userConn, muxConnRWCloser)
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xl.Debug("join connections closed")
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if len(errs) > 0 {
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xl.Trace("join connections errors: %v", errs)
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}
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}
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// openTunnel will open a tunnel connection to the target server.
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func (sv *XTCPVisitor) openTunnel() (conn net.Conn, err error) {
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xl := xlog.FromContextSafe(sv.ctx)
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ticker := time.NewTicker(500 * time.Millisecond)
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defer ticker.Stop()
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timeoutC := time.After(20 * time.Second)
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immediateTrigger := make(chan struct{}, 1)
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defer close(immediateTrigger)
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immediateTrigger <- struct{}{}
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for {
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select {
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case <-sv.ctx.Done():
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return nil, sv.ctx.Err()
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case <-immediateTrigger:
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conn, err = sv.getTunnelConn()
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case <-ticker.C:
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conn, err = sv.getTunnelConn()
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case <-timeoutC:
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return nil, fmt.Errorf("open tunnel timeout")
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}
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if err != nil {
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xl.Warn("get tunnel connection error: %v", err)
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continue
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}
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// If there is no tunnel connection, we will continue to wait for a new one until timeout.
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if conn == nil {
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continue
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}
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return conn, nil
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}
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}
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func (sv *XTCPVisitor) getTunnelConn() (conn net.Conn, err error) {
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var (
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kcpSession *fmux.Session
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quicSession quic.Connection
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)
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sv.mu.RLock()
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kcpSession = sv.kcpSession
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quicSession = sv.quicSession
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sv.mu.RUnlock()
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if sv.cfg.Protocol == "kcp" && kcpSession != nil {
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conn, err = kcpSession.Open()
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if err != nil {
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sv.mu.Lock()
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if sv.kcpSession != nil {
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sv.kcpSession.Close()
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sv.kcpSession = nil
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}
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sv.mu.Unlock()
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return nil, err
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}
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return
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} else if quicSession != nil {
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stream, err := quicSession.OpenStreamSync(sv.ctx)
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if err != nil {
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sv.mu.Lock()
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if sv.quicSession != nil {
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_ = sv.quicSession.CloseWithError(0, "")
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sv.quicSession = nil
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}
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sv.mu.Unlock()
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return nil, err
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}
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conn = frpNet.QuicStreamToNetConn(stream, quicSession)
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return conn, err
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}
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select {
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case sv.startTunnelCh <- struct{}{}:
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default:
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}
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return nil, nil
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}
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// 1. Prepare
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// 2. ExchangeInfo
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// 3. MakeHole
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// 4. Create a QUIC or KCP session using an underlying UDP connection.
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func (sv *XTCPVisitor) makeNatHole() {
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xl := xlog.FromContextSafe(sv.ctx)
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prepareResult, err := nathole.Prepare([]string{sv.clientCfg.NatHoleSTUNServer})
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if err != nil {
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xl.Warn("nathole prepare error: %v", err)
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return
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}
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xl.Info("nathole prepare success, nat type: %s, behavior: %s, addresses: %v, assistedAddresses: %v",
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prepareResult.NatType, prepareResult.Behavior, prepareResult.Addrs, prepareResult.AssistedAddrs)
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listenConn := prepareResult.ListenConn
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// send NatHoleVisitor to server
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now := time.Now().Unix()
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transactionID := nathole.NewTransactionID()
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natHoleVisitorMsg := &msg.NatHoleVisitor{
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TransactionID: transactionID,
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ProxyName: sv.cfg.ServerName,
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SignKey: util.GetAuthKey(sv.cfg.Sk, now),
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Timestamp: now,
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MappedAddrs: prepareResult.Addrs,
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AssistedAddrs: prepareResult.AssistedAddrs,
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}
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natHoleRespMsg, err := nathole.ExchangeInfo(sv.ctx, sv.msgTransporter, transactionID, natHoleVisitorMsg, 5*time.Second)
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if err != nil {
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listenConn.Close()
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xl.Warn("nathole exchange info error: %v", err)
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return
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}
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xl.Info("get natHoleRespMsg, sid [%s], candidate address %v, assisted address %v, detectBehavior: %+v",
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natHoleRespMsg.Sid, natHoleRespMsg.CandidateAddrs, natHoleRespMsg.AssistedAddrs, natHoleRespMsg.DetectBehavior)
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newListenConn, raddr, err := nathole.MakeHole(sv.ctx, listenConn, natHoleRespMsg, []byte(sv.cfg.Sk))
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if err != nil {
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listenConn.Close()
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xl.Warn("make hole error: %v", err)
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return
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}
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listenConn = newListenConn
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xl.Info("establishing nat hole connection successful, sid [%s], remoteAddr [%s]", natHoleRespMsg.Sid, raddr)
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if sv.cfg.Protocol == "kcp" {
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kcpSession, err := sv.createKCPSession(listenConn, raddr)
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if err != nil {
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xl.Warn("create kcp session error: %v", err)
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listenConn.Close()
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return
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}
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sv.mu.Lock()
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sv.kcpSession = kcpSession
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sv.mu.Unlock()
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return
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}
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// default is quic
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quicSession, err := sv.createQUICSession(listenConn, raddr)
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if err != nil {
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xl.Warn("create quic session error: %v", err)
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listenConn.Close()
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return
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}
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sv.mu.Lock()
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sv.quicSession = quicSession
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sv.mu.Unlock()
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}
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func (sv *XTCPVisitor) createKCPSession(listenConn *net.UDPConn, raddr *net.UDPAddr) (*fmux.Session, error) {
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listenConn.Close()
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laddr, _ := net.ResolveUDPAddr("udp", listenConn.LocalAddr().String())
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lConn, err := net.DialUDP("udp", laddr, raddr)
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if err != nil {
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return nil, fmt.Errorf("dial udp error: %v", err)
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}
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remote, err := frpNet.NewKCPConnFromUDP(lConn, true, raddr.String())
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if err != nil {
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return nil, fmt.Errorf("create kcp connection from udp connection error: %v", err)
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}
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fmuxCfg := fmux.DefaultConfig()
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fmuxCfg.KeepAliveInterval = 10 * time.Second
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fmuxCfg.MaxStreamWindowSize = 1024 * 1024
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fmuxCfg.LogOutput = io.Discard
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session, err := fmux.Client(remote, fmuxCfg)
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if err != nil {
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remote.Close()
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return nil, fmt.Errorf("initial client session error: %v", err)
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}
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return session, nil
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}
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func (sv *XTCPVisitor) createQUICSession(listenConn *net.UDPConn, raddr *net.UDPAddr) (quic.Connection, error) {
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tlsConfig, err := transport.NewClientTLSConfig("", "", "", raddr.String())
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if err != nil {
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return nil, fmt.Errorf("create tls config error: %v", err)
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}
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tlsConfig.NextProtos = []string{"frp"}
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quicConn, err := quic.Dial(listenConn, raddr, raddr.String(), tlsConfig,
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&quic.Config{
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MaxIdleTimeout: time.Duration(sv.clientCfg.QUICMaxIdleTimeout) * time.Second,
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MaxIncomingStreams: int64(sv.clientCfg.QUICMaxIncomingStreams),
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KeepAlivePeriod: time.Duration(sv.clientCfg.QUICKeepalivePeriod) * time.Second,
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})
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if err != nil {
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return nil, fmt.Errorf("dial quic error: %v", err)
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}
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return quicConn, nil
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}
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