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297 lines
8.8 KiB
297 lines
8.8 KiB
// 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 client
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import (
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"context"
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"net"
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"sync/atomic"
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"time"
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"github.com/samber/lo"
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"github.com/fatedier/frp/client/proxy"
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"github.com/fatedier/frp/client/visitor"
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"github.com/fatedier/frp/pkg/auth"
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v1 "github.com/fatedier/frp/pkg/config/v1"
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"github.com/fatedier/frp/pkg/msg"
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"github.com/fatedier/frp/pkg/transport"
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netpkg "github.com/fatedier/frp/pkg/util/net"
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"github.com/fatedier/frp/pkg/util/wait"
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"github.com/fatedier/frp/pkg/util/xlog"
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)
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type SessionContext struct {
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// The client common configuration.
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Common *v1.ClientCommonConfig
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// Unique ID obtained from frps.
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// It should be attached to the login message when reconnecting.
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RunID string
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// Underlying control connection. Once conn is closed, the msgDispatcher and the entire Control will exit.
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Conn net.Conn
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// Indicates whether the connection is encrypted.
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ConnEncrypted bool
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// Sets authentication based on selected method
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AuthSetter auth.Setter
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// Connector is used to create new connections, which could be real TCP connections or virtual streams.
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Connector Connector
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}
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type Control struct {
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// service context
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ctx context.Context
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xl *xlog.Logger
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// session context
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sessionCtx *SessionContext
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// manage all proxies
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pm *proxy.Manager
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// manage all visitors
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vm *visitor.Manager
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doneCh chan struct{}
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// of time.Time, last time got the Pong message
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lastPong atomic.Value
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// The role of msgTransporter is similar to HTTP2.
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// It allows multiple messages to be sent simultaneously on the same control connection.
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// The server's response messages will be dispatched to the corresponding waiting goroutines based on the laneKey and message type.
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msgTransporter transport.MessageTransporter
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// msgDispatcher is a wrapper for control connection.
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// It provides a channel for sending messages, and you can register handlers to process messages based on their respective types.
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msgDispatcher *msg.Dispatcher
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}
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func NewControl(ctx context.Context, sessionCtx *SessionContext) (*Control, error) {
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// new xlog instance
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ctl := &Control{
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ctx: ctx,
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xl: xlog.FromContextSafe(ctx),
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sessionCtx: sessionCtx,
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doneCh: make(chan struct{}),
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}
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ctl.lastPong.Store(time.Now())
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if sessionCtx.ConnEncrypted {
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cryptoRW, err := netpkg.NewCryptoReadWriter(sessionCtx.Conn, []byte(sessionCtx.Common.Auth.Token))
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if err != nil {
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return nil, err
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}
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ctl.msgDispatcher = msg.NewDispatcher(cryptoRW)
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} else {
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ctl.msgDispatcher = msg.NewDispatcher(sessionCtx.Conn)
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}
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ctl.registerMsgHandlers()
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ctl.msgTransporter = transport.NewMessageTransporter(ctl.msgDispatcher.SendChannel())
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ctl.pm = proxy.NewManager(ctl.ctx, sessionCtx.Common, ctl.msgTransporter)
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ctl.vm = visitor.NewManager(ctl.ctx, sessionCtx.RunID, sessionCtx.Common, ctl.connectServer, ctl.msgTransporter)
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return ctl, nil
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}
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func (ctl *Control) Run(proxyCfgs []v1.ProxyConfigurer, visitorCfgs []v1.VisitorConfigurer) {
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go ctl.worker()
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// start all proxies
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ctl.pm.UpdateAll(proxyCfgs)
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// start all visitors
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ctl.vm.UpdateAll(visitorCfgs)
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}
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func (ctl *Control) SetInWorkConnCallback(cb func(*v1.ProxyBaseConfig, net.Conn, *msg.StartWorkConn) bool) {
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ctl.pm.SetInWorkConnCallback(cb)
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}
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func (ctl *Control) handleReqWorkConn(_ msg.Message) {
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xl := ctl.xl
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workConn, err := ctl.connectServer()
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if err != nil {
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xl.Warnf("start new connection to server error: %v", err)
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return
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}
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m := &msg.NewWorkConn{
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RunID: ctl.sessionCtx.RunID,
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}
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if err = ctl.sessionCtx.AuthSetter.SetNewWorkConn(m); err != nil {
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xl.Warnf("error during NewWorkConn authentication: %v", err)
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workConn.Close()
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return
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}
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if err = msg.WriteMsg(workConn, m); err != nil {
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xl.Warnf("work connection write to server error: %v", err)
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workConn.Close()
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return
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}
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var startMsg msg.StartWorkConn
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if err = msg.ReadMsgInto(workConn, &startMsg); err != nil {
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xl.Tracef("work connection closed before response StartWorkConn message: %v", err)
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workConn.Close()
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return
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}
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if startMsg.Error != "" {
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xl.Errorf("StartWorkConn contains error: %s", startMsg.Error)
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workConn.Close()
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return
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}
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// dispatch this work connection to related proxy
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ctl.pm.HandleWorkConn(startMsg.ProxyName, workConn, &startMsg)
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}
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func (ctl *Control) handleNewProxyResp(m msg.Message) {
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xl := ctl.xl
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inMsg := m.(*msg.NewProxyResp)
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// Server will return NewProxyResp message to each NewProxy message.
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// Start a new proxy handler if no error got
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err := ctl.pm.StartProxy(inMsg.ProxyName, inMsg.RemoteAddr, inMsg.Error)
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if err != nil {
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xl.Warnf("[%s] start error: %v", inMsg.ProxyName, err)
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} else {
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xl.Infof("[%s] start proxy success", inMsg.ProxyName)
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}
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}
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func (ctl *Control) handleNatHoleResp(m msg.Message) {
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xl := ctl.xl
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inMsg := m.(*msg.NatHoleResp)
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// Dispatch the NatHoleResp message to the related proxy.
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ok := ctl.msgTransporter.DispatchWithType(inMsg, msg.TypeNameNatHoleResp, inMsg.TransactionID)
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if !ok {
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xl.Tracef("dispatch NatHoleResp message to related proxy error")
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}
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}
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func (ctl *Control) handlePong(m msg.Message) {
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xl := ctl.xl
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inMsg := m.(*msg.Pong)
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if inMsg.Error != "" {
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xl.Errorf("Pong message contains error: %s", inMsg.Error)
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ctl.closeSession()
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return
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}
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ctl.lastPong.Store(time.Now())
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xl.Debugf("receive heartbeat from server")
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}
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// closeSession closes the control connection.
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func (ctl *Control) closeSession() {
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ctl.sessionCtx.Conn.Close()
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ctl.sessionCtx.Connector.Close()
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}
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func (ctl *Control) Close() error {
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return ctl.GracefulClose(0)
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}
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func (ctl *Control) GracefulClose(d time.Duration) error {
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ctl.pm.Close()
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ctl.vm.Close()
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time.Sleep(d)
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ctl.closeSession()
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return nil
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}
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// Done returns a channel that will be closed after all resources are released
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func (ctl *Control) Done() <-chan struct{} {
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return ctl.doneCh
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}
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// connectServer return a new connection to frps
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func (ctl *Control) connectServer() (net.Conn, error) {
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return ctl.sessionCtx.Connector.Connect()
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}
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func (ctl *Control) registerMsgHandlers() {
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ctl.msgDispatcher.RegisterHandler(&msg.ReqWorkConn{}, msg.AsyncHandler(ctl.handleReqWorkConn))
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ctl.msgDispatcher.RegisterHandler(&msg.NewProxyResp{}, ctl.handleNewProxyResp)
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ctl.msgDispatcher.RegisterHandler(&msg.NatHoleResp{}, ctl.handleNatHoleResp)
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ctl.msgDispatcher.RegisterHandler(&msg.Pong{}, ctl.handlePong)
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}
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// headerWorker sends heartbeat to server and check heartbeat timeout.
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func (ctl *Control) heartbeatWorker() {
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xl := ctl.xl
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// TODO(fatedier): Change default value of HeartbeatInterval to -1 if tcpmux is enabled.
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// Users can still enable heartbeat feature by setting HeartbeatInterval to a positive value.
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if ctl.sessionCtx.Common.Transport.HeartbeatInterval > 0 {
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// send heartbeat to server
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sendHeartBeat := func() (bool, error) {
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xl.Debugf("send heartbeat to server")
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pingMsg := &msg.Ping{}
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if err := ctl.sessionCtx.AuthSetter.SetPing(pingMsg); err != nil {
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xl.Warnf("error during ping authentication: %v, skip sending ping message", err)
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return false, err
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}
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_ = ctl.msgDispatcher.Send(pingMsg)
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return false, nil
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}
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go wait.BackoffUntil(sendHeartBeat,
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wait.NewFastBackoffManager(wait.FastBackoffOptions{
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Duration: time.Duration(ctl.sessionCtx.Common.Transport.HeartbeatInterval) * time.Second,
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InitDurationIfFail: time.Second,
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Factor: 2.0,
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Jitter: 0.1,
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MaxDuration: time.Duration(ctl.sessionCtx.Common.Transport.HeartbeatInterval) * time.Second,
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}),
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true, ctl.doneCh,
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)
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}
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// Check heartbeat timeout only if TCPMux is not enabled and users don't disable heartbeat feature.
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if ctl.sessionCtx.Common.Transport.HeartbeatInterval > 0 && ctl.sessionCtx.Common.Transport.HeartbeatTimeout > 0 &&
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!lo.FromPtr(ctl.sessionCtx.Common.Transport.TCPMux) {
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go wait.Until(func() {
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if time.Since(ctl.lastPong.Load().(time.Time)) > time.Duration(ctl.sessionCtx.Common.Transport.HeartbeatTimeout)*time.Second {
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xl.Warnf("heartbeat timeout")
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ctl.closeSession()
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return
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}
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}, time.Second, ctl.doneCh)
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}
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}
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func (ctl *Control) worker() {
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go ctl.heartbeatWorker()
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go ctl.msgDispatcher.Run()
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<-ctl.msgDispatcher.Done()
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ctl.closeSession()
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ctl.pm.Close()
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ctl.vm.Close()
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close(ctl.doneCh)
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}
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func (ctl *Control) UpdateAllConfigurer(proxyCfgs []v1.ProxyConfigurer, visitorCfgs []v1.VisitorConfigurer) error {
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ctl.vm.UpdateAll(visitorCfgs)
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ctl.pm.UpdateAll(proxyCfgs)
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return nil
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}
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