Exemplo n.º 1
0
// loop for reading messages from frpc after control connection is established
func msgReader(cli *client.ProxyClient, c *conn.Conn, msgSendChan chan interface{}) error {
	// for heartbeat
	var heartbeatTimeout bool = false
	timer := time.AfterFunc(time.Duration(client.HeartBeatTimeout)*time.Second, func() {
		heartbeatTimeout = true
		c.Close()
		log.Error("ProxyName [%s], heartbeatRes from frps timeout", cli.Name)
	})
	defer timer.Stop()

	for {
		buf, err := c.ReadLine()
		if err == io.EOF || c == nil || c.IsClosed() {
			c.Close()
			log.Warn("ProxyName [%s], frps close this control conn!", cli.Name)
			var delayTime time.Duration = 1

			// loop until reconnect to frps
			for {
				log.Info("ProxyName [%s], try to reconnect to frps [%s:%d]...", cli.Name, client.ServerAddr, client.ServerPort)
				c, err = loginToServer(cli)
				if err == nil {
					close(msgSendChan)
					msgSendChan = make(chan interface{}, 1024)
					go heartbeatSender(c, msgSendChan)
					go msgSender(cli, c, msgSendChan)
					break
				}

				if delayTime < 60 {
					delayTime = delayTime * 2
				}
				time.Sleep(delayTime * time.Second)
			}
			continue
		} else if err != nil {
			log.Warn("ProxyName [%s], read from frps error: %v", cli.Name, err)
			continue
		}

		ctlRes := &msg.ControlRes{}
		if err := json.Unmarshal([]byte(buf), &ctlRes); err != nil {
			log.Warn("ProxyName [%s], parse msg from frps error: %v : %s", cli.Name, err, buf)
			continue
		}

		switch ctlRes.Type {
		case consts.HeartbeatRes:
			log.Debug("ProxyName [%s], receive heartbeat response", cli.Name)
			timer.Reset(time.Duration(client.HeartBeatTimeout) * time.Second)
		case consts.NoticeUserConn:
			log.Debug("ProxyName [%s], new user connection", cli.Name)
			// join local and remote connections, async
			go cli.StartTunnel(client.ServerAddr, client.ServerPort)
		default:
			log.Warn("ProxyName [%s}, unsupport msgType [%d]", cli.Name, ctlRes.Type)
		}
	}
	return nil
}
Exemplo n.º 2
0
func loginToServer(cli *client.ProxyClient) (c *conn.Conn, err error) {
	c, err = conn.ConnectServer(client.ServerAddr, client.ServerPort)
	if err != nil {
		log.Error("ProxyName [%s], connect to server [%s:%d] error, %v", cli.Name, client.ServerAddr, client.ServerPort, err)
		return
	}

	nowTime := time.Now().Unix()
	req := &msg.ControlReq{
		Type:          consts.NewCtlConn,
		ProxyName:     cli.Name,
		UseEncryption: cli.UseEncryption,
		UseGzip:       cli.UseGzip,
		PrivilegeMode: cli.PrivilegeMode,
		ProxyType:     cli.Type,
		Timestamp:     nowTime,
	}
	if cli.PrivilegeMode {
		privilegeKey := pcrypto.GetAuthKey(cli.Name + client.PrivilegeToken + fmt.Sprintf("%d", nowTime))
		req.RemotePort = cli.RemotePort
		req.CustomDomains = cli.CustomDomains
		req.PrivilegeKey = privilegeKey
	} else {
		authKey := pcrypto.GetAuthKey(cli.Name + cli.AuthToken + fmt.Sprintf("%d", nowTime))
		req.AuthKey = authKey
	}

	buf, _ := json.Marshal(req)
	err = c.Write(string(buf) + "\n")
	if err != nil {
		log.Error("ProxyName [%s], write to server error, %v", cli.Name, err)
		return
	}

	res, err := c.ReadLine()
	if err != nil {
		log.Error("ProxyName [%s], read from server error, %v", cli.Name, err)
		return
	}
	log.Debug("ProxyName [%s], read [%s]", cli.Name, res)

	ctlRes := &msg.ControlRes{}
	if err = json.Unmarshal([]byte(res), &ctlRes); err != nil {
		log.Error("ProxyName [%s], format server response error, %v", cli.Name, err)
		return
	}

	if ctlRes.Code != 0 {
		log.Error("ProxyName [%s], start proxy error, %s", cli.Name, ctlRes.Msg)
		return c, fmt.Errorf("%s", ctlRes.Msg)
	}

	log.Debug("ProxyName [%s], connect to server [%s:%d] success!", cli.Name, client.ServerAddr, client.ServerPort)
	return
}
Exemplo n.º 3
0
// when frps get one new user connection, send NoticeUserConn message to frpc and accept one new WorkConn later
func noticeUserConn(s *server.ProxyServer, msgSendChan chan interface{}) {
	for {
		closeFlag := s.WaitUserConn()
		if closeFlag {
			log.Debug("ProxyName [%s], goroutine for noticing user conn is closed", s.Name)
			break
		}
		notice := &msg.ControlRes{
			Type: consts.NoticeUserConn,
		}
		msgSendChan <- notice
		log.Debug("ProxyName [%s], notice client to add work conn", s.Name)
	}
}
Exemplo n.º 4
0
func heartbeatSender(c *conn.Conn, msgSendChan chan interface{}) {
	heartbeatReq := &msg.ControlReq{
		Type: consts.HeartbeatReq,
	}
	log.Info("Start to send heartbeat to frps")
	for {
		time.Sleep(time.Duration(client.HeartBeatInterval) * time.Second)
		if c != nil && !c.IsClosed() {
			log.Debug("Send heartbeat to server")
			msgSendChan <- heartbeatReq
		} else {
			break
		}
	}
	log.Debug("Heartbeat goroutine exit")
}
Exemplo n.º 5
0
// join two connections and do some operations
func JoinMore(c1 *conn.Conn, c2 *conn.Conn, conf config.BaseConf) {
	var wait sync.WaitGroup
	encryptPipe := func(from *conn.Conn, to *conn.Conn) {
		defer from.Close()
		defer to.Close()
		defer wait.Done()

		// we don't care about errors here
		pipeEncrypt(from.TcpConn, to.TcpConn, conf)
	}

	decryptPipe := func(to *conn.Conn, from *conn.Conn) {
		defer from.Close()
		defer to.Close()
		defer wait.Done()

		// we don't care about errors here
		pipeDecrypt(to.TcpConn, from.TcpConn, conf)
	}

	wait.Add(2)
	go encryptPipe(c1, c2)
	go decryptPipe(c2, c1)
	wait.Wait()
	log.Debug("ProxyName [%s], One tunnel stopped", conf.Name)
	return
}
Exemplo n.º 6
0
// messages from c1 to c2 will be encrypted
// and from c2 to c1 will be decrypted
func JoinMore(c1 *Conn, c2 *Conn, cryptKey string) {
	var wait sync.WaitGroup
	encryptPipe := func(from *Conn, to *Conn, key string) {
		defer from.Close()
		defer to.Close()
		defer wait.Done()

		// we don't care about errors here
		PipeEncrypt(from.TcpConn, to.TcpConn, key)
	}

	decryptPipe := func(to *Conn, from *Conn, key string) {
		defer from.Close()
		defer to.Close()
		defer wait.Done()

		// we don't care about errors here
		PipeDecrypt(to.TcpConn, from.TcpConn, key)
	}

	wait.Add(2)
	go encryptPipe(c1, c2, cryptKey)
	go decryptPipe(c2, c1, cryptKey)
	wait.Wait()
	log.Debug("One tunnel stopped")
	return
}
Exemplo n.º 7
0
func ProcessControlConn(l *conn.Listener) {
	for {
		c, err := l.Accept()
		if err != nil {
			return
		}
		log.Debug("Get new connection, %v", c.GetRemoteAddr())
		go controlWorker(c)
	}
}
Exemplo n.º 8
0
func (p *ProxyClient) StartTunnel(serverAddr string, serverPort int64) (err error) {
	localConn, err := p.GetLocalConn()
	if err != nil {
		return
	}
	remoteConn, err := p.GetRemoteConn(serverAddr, serverPort)
	if err != nil {
		return
	}

	// l means local, r means remote
	log.Debug("Join two connections, (l[%s] r[%s]) (l[%s] r[%s])", localConn.GetLocalAddr(), localConn.GetRemoteAddr(),
		remoteConn.GetLocalAddr(), remoteConn.GetRemoteAddr())
	go msg.JoinMore(localConn, remoteConn, p.BaseConf)

	return nil
}
Exemplo n.º 9
0
// loop for reading messages from frpc after control connection is established
func msgReader(s *server.ProxyServer, c *conn.Conn, msgSendChan chan interface{}) error {
	// for heartbeat
	var heartbeatTimeout bool = false
	timer := time.AfterFunc(time.Duration(server.HeartBeatTimeout)*time.Second, func() {
		heartbeatTimeout = true
		s.Close()
		log.Error("ProxyName [%s], client heartbeat timeout", s.Name)
	})
	defer timer.Stop()

	for {
		buf, err := c.ReadLine()
		if err != nil {
			if err == io.EOF {
				log.Warn("ProxyName [%s], client is dead!", s.Name)
				return err
			} else if c == nil || c.IsClosed() {
				log.Warn("ProxyName [%s], client connection is closed", s.Name)
				return err
			}
			log.Warn("ProxyName [%s], read error: %v", s.Name, err)
			continue
		}

		cliReq := &msg.ControlReq{}
		if err := json.Unmarshal([]byte(buf), &cliReq); err != nil {
			log.Warn("ProxyName [%s], parse msg from frpc error: %v : %s", s.Name, err, buf)
			continue
		}

		switch cliReq.Type {
		case consts.HeartbeatReq:
			log.Debug("ProxyName [%s], get heartbeat", s.Name)
			timer.Reset(time.Duration(server.HeartBeatTimeout) * time.Second)
			heartbeatRes := &msg.ControlRes{
				Type: consts.HeartbeatRes,
			}
			msgSendChan <- heartbeatRes
		default:
			log.Warn("ProxyName [%s}, unsupport msgType [%d]", s.Name, cliReq.Type)
		}
	}
	return nil
}
Exemplo n.º 10
0
func (p *ProxyClient) StartTunnel(serverAddr string, serverPort int64) (err error) {
	localConn, err := p.GetLocalConn()
	if err != nil {
		return
	}
	remoteConn, err := p.GetRemoteConn(serverAddr, serverPort)
	if err != nil {
		return
	}

	// l means local, r means remote
	log.Debug("Join two connections, (l[%s] r[%s]) (l[%s] r[%s])", localConn.GetLocalAddr(), localConn.GetRemoteAddr(),
		remoteConn.GetLocalAddr(), remoteConn.GetRemoteAddr())
	if p.UseEncryption {
		go conn.JoinMore(localConn, remoteConn, p.AuthToken)
	} else {
		go conn.Join(localConn, remoteConn)
	}

	return nil
}
Exemplo n.º 11
0
// connection from every client and server
func controlWorker(c *conn.Conn) {
	// if login message type is NewWorkConn, don't close this connection
	var closeFlag bool = true
	var s *server.ProxyServer
	defer func() {
		if closeFlag {
			c.Close()
			if s != nil {
				s.Close()
			}
		}
	}()

	// get login message
	buf, err := c.ReadLine()
	if err != nil {
		log.Warn("Read error, %v", err)
		return
	}
	log.Debug("Get msg from frpc: %s", buf)

	cliReq := &msg.ControlReq{}
	if err := json.Unmarshal([]byte(buf), &cliReq); err != nil {
		log.Warn("Parse msg from frpc error: %v : %s", err, buf)
		return
	}

	// login when type is NewCtlConn or NewWorkConn
	ret, info := doLogin(cliReq, c)
	s, ok := server.ProxyServers[cliReq.ProxyName]
	if !ok {
		log.Warn("ProxyName [%s] is not exist", cliReq.ProxyName)
		return
	}
	// if login type is NewWorkConn, nothing will be send to frpc
	if cliReq.Type != consts.NewWorkConn {
		cliRes := &msg.ControlRes{
			Type: consts.NewCtlConnRes,
			Code: ret,
			Msg:  info,
		}
		byteBuf, _ := json.Marshal(cliRes)
		err = c.Write(string(byteBuf) + "\n")
		if err != nil {
			log.Warn("ProxyName [%s], write to client error, proxy exit", s.Name)
			time.Sleep(1 * time.Second)
			return
		}
	} else {
		closeFlag = false
		return
	}

	// if login failed, just return
	if ret > 0 {
		return
	}

	// create a channel for sending messages
	msgSendChan := make(chan interface{}, 1024)
	go msgSender(s, c, msgSendChan)
	go noticeUserConn(s, msgSendChan)

	// loop for reading control messages from frpc and deal with different types
	msgReader(s, c, msgSendChan)

	close(msgSendChan)
	log.Info("ProxyName [%s], I'm dead!", s.Name)
	return
}
Exemplo n.º 12
0
// start listening for user conns
func (p *ProxyServer) Start(c *conn.Conn) (err error) {
	p.CtlConn = c
	p.Init()
	if p.Type == "tcp" {
		l, err := conn.Listen(p.BindAddr, p.ListenPort)
		if err != nil {
			return err
		}
		p.listeners = append(p.listeners, l)
	} else if p.Type == "http" {
		for _, domain := range p.CustomDomains {
			l, err := VhostMuxer.Listen(domain)
			if err != nil {
				return err
			}
			p.listeners = append(p.listeners, l)
		}
	}

	p.Lock()
	p.Status = consts.Working
	p.Unlock()

	// start a goroutine for every listener to accept user connection
	for _, listener := range p.listeners {
		go func(l Listener) {
			for {
				// block
				// if listener is closed, err returned
				c, err := l.Accept()
				if err != nil {
					log.Info("ProxyName [%s], listener is closed", p.Name)
					return
				}
				log.Debug("ProxyName [%s], get one new user conn [%s]", p.Name, c.GetRemoteAddr())

				if p.Status != consts.Working {
					log.Debug("ProxyName [%s] is not working, new user conn close", p.Name)
					c.Close()
					return
				}

				// start another goroutine for join two conns from frpc and user
				go func() {
					workConn, err := p.getWorkConn()
					if err != nil {
						return
					}

					userConn := c
					// msg will transfer to another without modifying
					// l means local, r means remote
					log.Debug("Join two connections, (l[%s] r[%s]) (l[%s] r[%s])", workConn.GetLocalAddr(), workConn.GetRemoteAddr(),
						userConn.GetLocalAddr(), userConn.GetRemoteAddr())

					if p.UseEncryption {
						go conn.JoinMore(userConn, workConn, p.AuthToken)
					} else {
						go conn.Join(userConn, workConn)
					}
				}()
			}
		}(listener)
	}
	return nil
}
Exemplo n.º 13
0
// if success, ret equals 0, otherwise greater than 0
func doLogin(req *msg.ControlReq, c *conn.Conn) (ret int64, info string) {
	ret = 1
	if req.PrivilegeMode && !server.PrivilegeMode {
		info = fmt.Sprintf("ProxyName [%s], PrivilegeMode is disabled in frps", req.ProxyName)
		log.Warn("info")
		return
	}

	var (
		s  *server.ProxyServer
		ok bool
	)
	s, ok = server.ProxyServers[req.ProxyName]
	if req.PrivilegeMode && req.Type == consts.NewCtlConn {
		log.Debug("ProxyName [%s], doLogin and privilege mode is enabled", req.ProxyName)
	} else {
		if !ok {
			info = fmt.Sprintf("ProxyName [%s] is not exist", req.ProxyName)
			log.Warn(info)
			return
		}
	}

	// check authKey or privilegeKey
	nowTime := time.Now().Unix()
	if req.PrivilegeMode {
		privilegeKey := pcrypto.GetAuthKey(req.ProxyName + server.PrivilegeToken + fmt.Sprintf("%d", req.Timestamp))
		// privilegeKey avaiable in 15 minutes
		if nowTime-req.Timestamp > 15*60 {
			info = fmt.Sprintf("ProxyName [%s], privilege mode authorization timeout", req.ProxyName)
			log.Warn(info)
			return
		} else if req.PrivilegeKey != privilegeKey {
			info = fmt.Sprintf("ProxyName [%s], privilege mode authorization failed", req.ProxyName)
			log.Warn(info)
			return
		}
	} else {
		authKey := pcrypto.GetAuthKey(req.ProxyName + s.AuthToken + fmt.Sprintf("%d", req.Timestamp))
		// authKey avaiable in 15 minutes
		if nowTime-req.Timestamp > 15*60 {
			info = fmt.Sprintf("ProxyName [%s], authorization timeout", req.ProxyName)
			log.Warn(info)
			return
		} else if req.AuthKey != authKey {
			info = fmt.Sprintf("ProxyName [%s], authorization failed", req.ProxyName)
			log.Warn(info)
			return
		}
	}

	// control conn
	if req.Type == consts.NewCtlConn {
		if req.PrivilegeMode {
			s = server.NewProxyServerFromCtlMsg(req)
			err := server.CreateProxy(s)
			if err != nil {
				info = fmt.Sprintf("ProxyName [%s], %v", req.ProxyName, err)
				log.Warn(info)
				return
			}
		}

		if s.Status == consts.Working {
			info = fmt.Sprintf("ProxyName [%s], already in use", req.ProxyName)
			log.Warn(info)
			return
		}

		// check if vhost_port is set
		if s.Type == "http" && server.VhostHttpMuxer == nil {
			info = fmt.Sprintf("ProxyName [%s], type [http] not support when vhost_http_port is not set", req.ProxyName)
			log.Warn(info)
			return
		}
		if s.Type == "https" && server.VhostHttpsMuxer == nil {
			info = fmt.Sprintf("ProxyName [%s], type [https] not support when vhost_https_port is not set", req.ProxyName)
			log.Warn(info)
			return
		}

		// set infomations from frpc
		s.UseEncryption = req.UseEncryption
		s.UseGzip = req.UseGzip

		// start proxy and listen for user connections, no block
		err := s.Start(c)
		if err != nil {
			info = fmt.Sprintf("ProxyName [%s], start proxy error: %v", req.ProxyName, err)
			log.Warn(info)
			return
		}
		log.Info("ProxyName [%s], start proxy success", req.ProxyName)
		if req.PrivilegeMode {
			log.Info("ProxyName [%s], created by PrivilegeMode", req.ProxyName)
		}
	} else if req.Type == consts.NewWorkConn {
		// work conn
		if s.Status != consts.Working {
			log.Warn("ProxyName [%s], is not working when it gets one new work connnection", req.ProxyName)
			return
		}
		// the connection will close after join over
		s.RegisterNewWorkConn(c)
	} else {
		info = fmt.Sprintf("Unsupport login message type [%d]", req.Type)
		log.Warn("Unsupport login message type [%d]", req.Type)
		return
	}

	ret = 0
	return
}