frp/client/control.go

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// Copyright 2017 fatedier, fatedier@gmail.com
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package client
import (
"fmt"
"io"
"runtime"
"sync"
"time"
"github.com/fatedier/frp/models/config"
"github.com/fatedier/frp/models/msg"
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"github.com/fatedier/frp/utils/crypto"
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"github.com/fatedier/frp/utils/log"
"github.com/fatedier/frp/utils/net"
"github.com/fatedier/frp/utils/util"
"github.com/fatedier/frp/utils/version"
"github.com/xtaci/smux"
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)
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const (
connReadTimeout time.Duration = 10 * time.Second
)
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type Control struct {
// frpc service
svr *Service
// login message to server
loginMsg *msg.Login
// proxy configures
pxyCfgs map[string]config.ProxyConf
// proxies
proxies map[string]Proxy
// control connection
conn net.Conn
// tcp stream multiplexing, if enabled
session *smux.Session
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// put a message in this channel to send it over control connection to server
sendCh chan (msg.Message)
// read from this channel to get the next message sent by server
readCh chan (msg.Message)
// run id got from server
runId string
// connection or other error happens , control will try to reconnect to server
closed int32
// goroutines can block by reading from this channel, it will be closed only in reader() when control connection is closed
closedCh chan int
// last time got the Pong message
lastPong time.Time
mu sync.RWMutex
log.Logger
}
func NewControl(svr *Service, pxyCfgs map[string]config.ProxyConf) *Control {
loginMsg := &msg.Login{
Arch: runtime.GOARCH,
Os: runtime.GOOS,
PoolCount: config.ClientCommonCfg.PoolCount,
User: config.ClientCommonCfg.User,
Version: version.Full(),
}
return &Control{
svr: svr,
loginMsg: loginMsg,
pxyCfgs: pxyCfgs,
proxies: make(map[string]Proxy),
sendCh: make(chan msg.Message, 10),
readCh: make(chan msg.Message, 10),
closedCh: make(chan int),
Logger: log.NewPrefixLogger(""),
}
}
// 1. login
// 2. start reader() writer() manager()
// 3. connection closed
// 4. In reader(): close closedCh and exit, controler() get it
// 5. In controler(): close readCh and sendCh, manager() and writer() will exit
// 6. In controler(): ini readCh, sendCh, closedCh
// 7. In controler(): start new reader(), writer(), manager()
// controler() will keep running
func (ctl *Control) Run() error {
err := ctl.login()
if err != nil {
return err
}
go ctl.controler()
go ctl.manager()
go ctl.writer()
go ctl.reader()
// send NewProxy message for all configured proxies
for _, cfg := range ctl.pxyCfgs {
var newProxyMsg msg.NewProxy
cfg.UnMarshalToMsg(&newProxyMsg)
ctl.sendCh <- &newProxyMsg
}
return nil
}
func (ctl *Control) NewWorkConn() {
var (
workConn net.Conn
err error
)
if config.ClientCommonCfg.TcpMux {
stream, err := ctl.session.OpenStream()
if err != nil {
ctl.Warn("start new work connection error: %v", err)
return
}
workConn = net.WrapConn(stream)
} else {
workConn, err = net.ConnectTcpServerByHttpProxy(config.ClientCommonCfg.HttpProxy,
fmt.Sprintf("%s:%d", config.ClientCommonCfg.ServerAddr, config.ClientCommonCfg.ServerPort))
if err != nil {
ctl.Warn("start new work connection error: %v", err)
return
}
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}
m := &msg.NewWorkConn{
RunId: ctl.runId,
}
if err = msg.WriteMsg(workConn, m); err != nil {
ctl.Warn("work connection write to server error: %v", err)
workConn.Close()
return
}
var startMsg msg.StartWorkConn
if err = msg.ReadMsgInto(workConn, &startMsg); err != nil {
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ctl.Error("work connection closed, %v", err)
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workConn.Close()
return
}
workConn.AddLogPrefix(startMsg.ProxyName)
// dispatch this work connection to related proxy
if pxy, ok := ctl.proxies[startMsg.ProxyName]; ok {
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workConn.Info("start a new work connection, localAddr: %s remoteAddr: %s", workConn.LocalAddr().String(), workConn.RemoteAddr().String())
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go pxy.InWorkConn(workConn)
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} else {
workConn.Close()
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}
}
func (ctl *Control) init() {
ctl.sendCh = make(chan msg.Message, 10)
ctl.readCh = make(chan msg.Message, 10)
ctl.closedCh = make(chan int)
}
// login send a login message to server and wait for a loginResp message.
func (ctl *Control) login() (err error) {
if ctl.conn != nil {
ctl.conn.Close()
}
if ctl.session != nil {
ctl.session.Close()
}
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conn, err := net.ConnectTcpServerByHttpProxy(config.ClientCommonCfg.HttpProxy,
fmt.Sprintf("%s:%d", config.ClientCommonCfg.ServerAddr, config.ClientCommonCfg.ServerPort))
if err != nil {
return err
}
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defer func() {
if err != nil {
conn.Close()
}
}()
if config.ClientCommonCfg.TcpMux {
session, errRet := smux.Client(conn, nil)
if errRet != nil {
return errRet
}
stream, errRet := session.OpenStream()
if errRet != nil {
session.Close()
return errRet
}
conn = net.WrapConn(stream)
ctl.session = session
}
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now := time.Now().Unix()
ctl.loginMsg.PrivilegeKey = util.GetAuthKey(config.ClientCommonCfg.PrivilegeToken, now)
ctl.loginMsg.Timestamp = now
ctl.loginMsg.RunId = ctl.runId
if err = msg.WriteMsg(conn, ctl.loginMsg); err != nil {
return err
}
var loginRespMsg msg.LoginResp
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conn.SetReadDeadline(time.Now().Add(connReadTimeout))
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if err = msg.ReadMsgInto(conn, &loginRespMsg); err != nil {
return err
}
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conn.SetReadDeadline(time.Time{})
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if loginRespMsg.Error != "" {
err = fmt.Errorf("%s", loginRespMsg.Error)
ctl.Error("%s", loginRespMsg.Error)
return err
}
ctl.conn = conn
// update runId got from server
ctl.runId = loginRespMsg.RunId
ctl.ClearLogPrefix()
ctl.AddLogPrefix(loginRespMsg.RunId)
ctl.Info("login to server success, get run id [%s]", loginRespMsg.RunId)
// login success, so we let closedCh available again
ctl.closedCh = make(chan int)
ctl.lastPong = time.Now()
return nil
}
func (ctl *Control) reader() {
defer func() {
if err := recover(); err != nil {
ctl.Error("panic error: %v", err)
}
}()
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defer close(ctl.closedCh)
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encReader := crypto.NewReader(ctl.conn, []byte(config.ClientCommonCfg.PrivilegeToken))
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for {
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if m, err := msg.ReadMsg(encReader); err != nil {
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if err == io.EOF {
ctl.Debug("read from control connection EOF")
return
} else {
ctl.Warn("read error: %v", err)
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return
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}
} else {
ctl.readCh <- m
}
}
}
func (ctl *Control) writer() {
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encWriter, err := crypto.NewWriter(ctl.conn, []byte(config.ClientCommonCfg.PrivilegeToken))
if err != nil {
ctl.conn.Error("crypto new writer error: %v", err)
ctl.conn.Close()
return
}
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for {
if m, ok := <-ctl.sendCh; !ok {
ctl.Info("control writer is closing")
return
} else {
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if err := msg.WriteMsg(encWriter, m); err != nil {
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ctl.Warn("write message to control connection error: %v", err)
return
}
}
}
}
func (ctl *Control) manager() {
defer func() {
if err := recover(); err != nil {
ctl.Error("panic error: %v", err)
}
}()
hbSend := time.NewTicker(time.Duration(config.ClientCommonCfg.HeartBeatInterval) * time.Second)
defer hbSend.Stop()
hbCheck := time.NewTicker(time.Second)
defer hbCheck.Stop()
for {
select {
case <-hbSend.C:
// send heartbeat to server
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ctl.Debug("send heartbeat to server")
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ctl.sendCh <- &msg.Ping{}
case <-hbCheck.C:
if time.Since(ctl.lastPong) > time.Duration(config.ClientCommonCfg.HeartBeatTimeout)*time.Second {
ctl.Warn("heartbeat timeout")
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// let reader() stop
ctl.conn.Close()
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return
}
case rawMsg, ok := <-ctl.readCh:
if !ok {
return
}
switch m := rawMsg.(type) {
case *msg.ReqWorkConn:
go ctl.NewWorkConn()
case *msg.NewProxyResp:
// Server will return NewProxyResp message to each NewProxy message.
// Start a new proxy handler if no error got
if m.Error != "" {
ctl.Warn("[%s] start error: %s", m.ProxyName, m.Error)
continue
}
cfg, ok := ctl.pxyCfgs[m.ProxyName]
if !ok {
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// it will never go to this branch now
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ctl.Warn("[%s] no proxy conf found", m.ProxyName)
continue
}
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oldPxy, ok := ctl.proxies[m.ProxyName]
if ok {
oldPxy.Close()
}
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pxy := NewProxy(ctl, cfg)
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if err := pxy.Run(); err != nil {
ctl.Warn("[%s] proxy start running error: %v", m.ProxyName, err)
continue
}
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ctl.proxies[m.ProxyName] = pxy
ctl.Info("[%s] start proxy success", m.ProxyName)
case *msg.Pong:
ctl.lastPong = time.Now()
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ctl.Debug("receive heartbeat from server")
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}
}
}
}
// control keep watching closedCh, start a new connection if previous control connection is closed
func (ctl *Control) controler() {
var err error
maxDelayTime := 30 * time.Second
delayTime := time.Second
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checkInterval := 30 * time.Second
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checkProxyTicker := time.NewTicker(checkInterval)
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for {
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select {
case <-checkProxyTicker.C:
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// Every 30 seconds, check which proxy registered failed and reregister it to server.
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for _, cfg := range ctl.pxyCfgs {
if _, exist := ctl.proxies[cfg.GetName()]; !exist {
ctl.Info("try to reregister proxy [%s]", cfg.GetName())
var newProxyMsg msg.NewProxy
cfg.UnMarshalToMsg(&newProxyMsg)
ctl.sendCh <- &newProxyMsg
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}
}
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case _, ok := <-ctl.closedCh:
// we won't get any variable from this channel
if !ok {
// close related channels
close(ctl.readCh)
close(ctl.sendCh)
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for _, pxy := range ctl.proxies {
pxy.Close()
}
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time.Sleep(time.Second)
// loop util reconnect to server success
for {
ctl.Info("try to reconnect to server...")
err = ctl.login()
if err != nil {
ctl.Warn("reconnect to server error: %v", err)
time.Sleep(delayTime)
delayTime = delayTime * 2
if delayTime > maxDelayTime {
delayTime = maxDelayTime
}
continue
}
// reconnect success, init the delayTime
delayTime = time.Second
break
}
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// init related channels and variables
ctl.init()
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// previous work goroutines should be closed and start them here
go ctl.manager()
go ctl.writer()
go ctl.reader()
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// send NewProxy message for all configured proxies
for _, cfg := range ctl.pxyCfgs {
var newProxyMsg msg.NewProxy
cfg.UnMarshalToMsg(&newProxyMsg)
ctl.sendCh <- &newProxyMsg
}
checkProxyTicker.Stop()
checkProxyTicker = time.NewTicker(checkInterval)
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}
}
}
}