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 (
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"crypto/tls"
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"fmt"
"io"
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"runtime/debug"
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"sync"
"time"
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"github.com/fatedier/frp/client/proxy"
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"github.com/fatedier/frp/g"
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"github.com/fatedier/frp/models/config"
"github.com/fatedier/frp/models/msg"
"github.com/fatedier/frp/utils/log"
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frpNet "github.com/fatedier/frp/utils/net"
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"github.com/fatedier/golib/control/shutdown"
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"github.com/fatedier/golib/crypto"
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fmux "github.com/hashicorp/yamux"
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)
type Control struct {
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// uniq id got from frps, attach it in loginMsg
runId string
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// manage all proxies
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pxyCfgs map[string]config.ProxyConf
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pm *proxy.ProxyManager
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// manage all visitors
vm *VisitorManager
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// control connection
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conn frpNet.Conn
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// tcp stream multiplexing, if enabled
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session *fmux.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)
// 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 struct{}
closedDoneCh chan struct{}
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// last time got the Pong message
lastPong time.Time
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readerShutdown *shutdown.Shutdown
writerShutdown *shutdown.Shutdown
msgHandlerShutdown *shutdown.Shutdown
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mu sync.RWMutex
log.Logger
}
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func NewControl(runId string, conn frpNet.Conn, session *fmux.Session, pxyCfgs map[string]config.ProxyConf, visitorCfgs map[string]config.VisitorConf) *Control {
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ctl := &Control{
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runId: runId,
conn: conn,
session: session,
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pxyCfgs: pxyCfgs,
sendCh: make(chan msg.Message, 100),
readCh: make(chan msg.Message, 100),
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closedCh: make(chan struct{}),
closedDoneCh: make(chan struct{}),
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readerShutdown: shutdown.New(),
writerShutdown: shutdown.New(),
msgHandlerShutdown: shutdown.New(),
Logger: log.NewPrefixLogger(""),
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}
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ctl.pm = proxy.NewProxyManager(ctl.sendCh, runId)
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ctl.vm = NewVisitorManager(ctl)
ctl.vm.Reload(visitorCfgs)
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return ctl
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}
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func (ctl *Control) Run() {
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go ctl.worker()
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// start all proxies
ctl.pm.Reload(ctl.pxyCfgs)
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// start all visitors
go ctl.vm.Run()
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return
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}
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func (ctl *Control) HandleReqWorkConn(inMsg *msg.ReqWorkConn) {
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workConn, err := ctl.connectServer()
if err != nil {
return
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}
m := &msg.NewWorkConn{
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RunId: ctl.runId,
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}
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
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ctl.pm.HandleWorkConn(startMsg.ProxyName, workConn, &startMsg)
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}
func (ctl *Control) HandleNewProxyResp(inMsg *msg.NewProxyResp) {
// Server will return NewProxyResp message to each NewProxy message.
// 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 {
ctl.Warn("[%s] start error: %v", inMsg.ProxyName, err)
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} else {
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ctl.Info("[%s] start proxy success", inMsg.ProxyName)
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}
}
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func (ctl *Control) Close() error {
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ctl.pm.Close()
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ctl.conn.Close()
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return nil
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}
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// ClosedDoneCh returns a channel which will be closed after all resources are released
func (ctl *Control) ClosedDoneCh() <-chan struct{} {
return ctl.closedDoneCh
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}
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// connectServer return a new connection to frps
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func (ctl *Control) connectServer() (conn frpNet.Conn, err error) {
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if g.GlbClientCfg.TcpMux {
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stream, errRet := ctl.session.OpenStream()
if errRet != nil {
err = errRet
ctl.Warn("start new connection to server error: %v", err)
return
}
conn = frpNet.WrapConn(stream)
} else {
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var tlsConfig *tls.Config
if g.GlbClientCfg.TLSEnable {
tlsConfig = &tls.Config{
InsecureSkipVerify: true,
}
}
conn, err = frpNet.ConnectServerByProxyWithTLS(g.GlbClientCfg.HttpProxy, g.GlbClientCfg.Protocol,
fmt.Sprintf("%s:%d", g.GlbClientCfg.ServerAddr, g.GlbClientCfg.ServerPort), tlsConfig)
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if err != nil {
ctl.Warn("start new connection to server error: %v", err)
return
}
}
return
}
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// reader read all messages from frps and send to readCh
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func (ctl *Control) reader() {
defer func() {
if err := recover(); err != nil {
ctl.Error("panic error: %v", err)
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ctl.Error(string(debug.Stack()))
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}
}()
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defer ctl.readerShutdown.Done()
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defer close(ctl.closedCh)
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encReader := crypto.NewReader(ctl.conn, []byte(g.GlbClientCfg.Token))
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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
}
}
}
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// writer writes messages got from sendCh to frps
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func (ctl *Control) writer() {
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defer ctl.writerShutdown.Done()
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encWriter, err := crypto.NewWriter(ctl.conn, []byte(g.GlbClientCfg.Token))
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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
}
}
}
}
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// msgHandler handles all channel events and do corresponding operations.
func (ctl *Control) msgHandler() {
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defer func() {
if err := recover(); err != nil {
ctl.Error("panic error: %v", err)
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ctl.Error(string(debug.Stack()))
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}
}()
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defer ctl.msgHandlerShutdown.Done()
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hbSend := time.NewTicker(time.Duration(g.GlbClientCfg.HeartBeatInterval) * time.Second)
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defer hbSend.Stop()
hbCheck := time.NewTicker(time.Second)
defer hbCheck.Stop()
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ctl.lastPong = time.Now()
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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:
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if time.Since(ctl.lastPong) > time.Duration(g.GlbClientCfg.HeartBeatTimeout)*time.Second {
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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:
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go ctl.HandleReqWorkConn(m)
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case *msg.NewProxyResp:
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ctl.HandleNewProxyResp(m)
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case *msg.Pong:
ctl.lastPong = time.Now()
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ctl.Debug("receive heartbeat from server")
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}
}
}
}
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// If controler is notified by closedCh, reader and writer and handler will exit
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func (ctl *Control) worker() {
go ctl.msgHandler()
go ctl.reader()
go ctl.writer()
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select {
case <-ctl.closedCh:
// close related channels and wait until other goroutines done
close(ctl.readCh)
ctl.readerShutdown.WaitDone()
ctl.msgHandlerShutdown.WaitDone()
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close(ctl.sendCh)
ctl.writerShutdown.WaitDone()
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ctl.pm.Close()
ctl.vm.Close()
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close(ctl.closedDoneCh)
return
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}
}
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func (ctl *Control) ReloadConf(pxyCfgs map[string]config.ProxyConf, visitorCfgs map[string]config.VisitorConf) error {
ctl.vm.Reload(visitorCfgs)
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ctl.pm.Reload(pxyCfgs)
return nil
}