mirror of
https://github.com/fatedier/frp.git
synced 2024-11-28 05:15:08 +08:00
346 lines
8.4 KiB
Go
346 lines
8.4 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 client
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import (
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"fmt"
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"io"
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"runtime"
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"sync"
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"time"
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"github.com/fatedier/frp/models/config"
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"github.com/fatedier/frp/models/msg"
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"github.com/fatedier/frp/utils/log"
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"github.com/fatedier/frp/utils/net"
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"github.com/fatedier/frp/utils/util"
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"github.com/fatedier/frp/utils/version"
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)
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type Control struct {
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// frpc service
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svr *Service
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// login message to server
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loginMsg *msg.Login
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// proxy configures
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pxyCfgs map[string]config.ProxyConf
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// proxies
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proxies map[string]Proxy
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// control connection
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conn net.Conn
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// put a message in this channel to send it over control connection to server
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sendCh chan (msg.Message)
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// read from this channel to get the next message sent by server
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readCh chan (msg.Message)
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// run id got from server
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runId string
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// connection or other error happens , control will try to reconnect to server
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closed int32
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// goroutines can block by reading from this channel, it will be closed only in reader() when control connection is closed
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closedCh chan int
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// last time got the Pong message
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lastPong time.Time
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mu sync.RWMutex
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log.Logger
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}
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func NewControl(svr *Service, pxyCfgs map[string]config.ProxyConf) *Control {
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loginMsg := &msg.Login{
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Arch: runtime.GOARCH,
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Os: runtime.GOOS,
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PoolCount: config.ClientCommonCfg.PoolCount,
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User: config.ClientCommonCfg.User,
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Version: version.Full(),
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}
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return &Control{
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svr: svr,
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loginMsg: loginMsg,
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pxyCfgs: pxyCfgs,
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proxies: make(map[string]Proxy),
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sendCh: make(chan msg.Message, 10),
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readCh: make(chan msg.Message, 10),
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closedCh: make(chan int),
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Logger: log.NewPrefixLogger(""),
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}
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}
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// 1. login
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// 2. start reader() writer() manager()
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// 3. connection closed
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// 4. In reader(): close closedCh and exit, controler() get it
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// 5. In controler(): close readCh and sendCh, manager() and writer() will exit
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// 6. In controler(): ini readCh, sendCh, closedCh
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// 7. In controler(): start new reader(), writer(), manager()
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// controler() will keep running
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func (ctl *Control) Run() error {
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err := ctl.login()
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if err != nil {
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return err
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}
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go ctl.controler()
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go ctl.manager()
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go ctl.writer()
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go ctl.reader()
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// send NewProxy message for all configured proxies
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for _, cfg := range ctl.pxyCfgs {
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var newProxyMsg msg.NewProxy
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cfg.UnMarshalToMsg(&newProxyMsg)
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ctl.sendCh <- &newProxyMsg
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}
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return nil
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}
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func (ctl *Control) NewWorkConn() {
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workConn, err := net.ConnectTcpServerByHttpProxy(config.ClientCommonCfg.HttpProxy,
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fmt.Sprintf("%s:%d", config.ClientCommonCfg.ServerAddr, config.ClientCommonCfg.ServerPort))
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if err != nil {
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ctl.Warn("start new work connection 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.runId,
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}
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if err = msg.WriteMsg(workConn, m); err != nil {
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ctl.Warn("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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ctl.Error("work connection closed and no response from server, %v", err)
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workConn.Close()
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return
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}
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workConn.AddLogPrefix(startMsg.ProxyName)
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// dispatch this work connection to related proxy
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if pxy, ok := ctl.proxies[startMsg.ProxyName]; ok {
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go pxy.InWorkConn(workConn)
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workConn.Info("start a new work connection")
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}
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}
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func (ctl *Control) init() {
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ctl.sendCh = make(chan msg.Message, 10)
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ctl.readCh = make(chan msg.Message, 10)
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ctl.closedCh = make(chan int)
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}
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// login send a login message to server and wait for a loginResp message.
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func (ctl *Control) login() (err error) {
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if ctl.conn != nil {
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ctl.conn.Close()
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}
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conn, err := net.ConnectTcpServerByHttpProxy(config.ClientCommonCfg.HttpProxy,
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fmt.Sprintf("%s:%d", config.ClientCommonCfg.ServerAddr, config.ClientCommonCfg.ServerPort))
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if err != nil {
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return err
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}
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now := time.Now().Unix()
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ctl.loginMsg.PrivilegeKey = util.GetAuthKey(config.ClientCommonCfg.PrivilegeToken, now)
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ctl.loginMsg.Timestamp = now
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ctl.loginMsg.RunId = ctl.runId
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if err = msg.WriteMsg(conn, ctl.loginMsg); err != nil {
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return err
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}
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var loginRespMsg msg.LoginResp
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if err = msg.ReadMsgInto(conn, &loginRespMsg); err != nil {
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return err
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}
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if loginRespMsg.Error != "" {
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err = fmt.Errorf("%s", loginRespMsg.Error)
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ctl.Error("%s", loginRespMsg.Error)
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return err
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}
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ctl.conn = conn
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// update runId got from server
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ctl.runId = loginRespMsg.RunId
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ctl.ClearLogPrefix()
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ctl.AddLogPrefix(loginRespMsg.RunId)
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ctl.Info("login to server success, get run id [%s]", loginRespMsg.RunId)
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// login success, so we let closedCh available again
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ctl.closedCh = make(chan int)
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ctl.lastPong = time.Now()
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return nil
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}
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func (ctl *Control) reader() {
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defer func() {
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if err := recover(); err != nil {
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ctl.Error("panic error: %v", err)
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}
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}()
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for {
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if m, err := msg.ReadMsg(ctl.conn); err != nil {
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if err == io.EOF {
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ctl.Debug("read from control connection EOF")
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close(ctl.closedCh)
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return
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} else {
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ctl.Warn("read error: %v", err)
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continue
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}
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} else {
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ctl.readCh <- m
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}
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}
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}
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func (ctl *Control) writer() {
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for {
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if m, ok := <-ctl.sendCh; !ok {
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ctl.Info("control writer is closing")
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return
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} else {
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if err := msg.WriteMsg(ctl.conn, m); err != nil {
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ctl.Warn("write message to control connection error: %v", err)
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return
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}
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}
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}
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}
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func (ctl *Control) manager() {
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defer func() {
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if err := recover(); err != nil {
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ctl.Error("panic error: %v", err)
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}
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}()
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hbSend := time.NewTicker(time.Duration(config.ClientCommonCfg.HeartBeatInterval) * time.Second)
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defer hbSend.Stop()
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hbCheck := time.NewTicker(time.Second)
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defer hbCheck.Stop()
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for {
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select {
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case <-hbSend.C:
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// send heartbeat to server
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ctl.sendCh <- &msg.Ping{}
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case <-hbCheck.C:
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if time.Since(ctl.lastPong) > time.Duration(config.ClientCommonCfg.HeartBeatTimeout)*time.Second {
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ctl.Warn("heartbeat timeout")
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return
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}
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case rawMsg, ok := <-ctl.readCh:
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if !ok {
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return
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}
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switch m := rawMsg.(type) {
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case *msg.ReqWorkConn:
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go ctl.NewWorkConn()
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case *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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if m.Error != "" {
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ctl.Warn("[%s] start error: %s", m.ProxyName, m.Error)
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continue
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}
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oldPxy, ok := ctl.proxies[m.ProxyName]
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if ok {
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oldPxy.Close()
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}
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cfg, ok := ctl.pxyCfgs[m.ProxyName]
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if !ok {
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// it will never go to this branch
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ctl.Warn("[%s] no proxy conf found", m.ProxyName)
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continue
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}
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pxy := NewProxy(ctl, cfg)
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pxy.Run()
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ctl.proxies[m.ProxyName] = pxy
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ctl.Info("[%s] start proxy success", m.ProxyName)
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case *msg.Pong:
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ctl.lastPong = time.Now()
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}
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}
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}
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}
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// control keep watching closedCh, start a new connection if previous control connection is closed
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func (ctl *Control) controler() {
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var err error
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maxDelayTime := 30 * time.Second
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delayTime := time.Second
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for {
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// we won't get any variable from this channel
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_, ok := <-ctl.closedCh
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if !ok {
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// close related channels
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close(ctl.readCh)
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close(ctl.sendCh)
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time.Sleep(time.Second)
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// loop util reconnect to server success
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for {
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ctl.Info("try to reconnect to server...")
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err = ctl.login()
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if err != nil {
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ctl.Warn("reconnect to server error: %v", err)
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time.Sleep(delayTime)
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delayTime = delayTime * 2
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if delayTime > maxDelayTime {
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delayTime = maxDelayTime
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}
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continue
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}
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// reconnect success, init the delayTime
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delayTime = time.Second
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break
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}
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// init related channels and variables
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ctl.init()
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// previous work goroutines should be closed and start them here
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go ctl.manager()
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go ctl.writer()
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go ctl.reader()
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// send NewProxy message for all configured proxies
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for _, cfg := range ctl.pxyCfgs {
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var newProxyMsg msg.NewProxy
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cfg.UnMarshalToMsg(&newProxyMsg)
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ctl.sendCh <- &newProxyMsg
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}
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}
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}
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}
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