Golang msg.ReadMsgInto函数代码示例

/**
 * Listens for new proxy connections from tunnel clients
 */
func proxyListener(addr *net.TCPAddr, domain string) {
	listener, err := conn.Listen(addr, "pxy", tls.Config)
	if err != nil {
		panic(err)
	}

	// set global proxy addr variable
	proxyAddr = fmt.Sprintf("%s:%d", domain, listener.Port)
	log.Info("Listening for proxy connection on %d", listener.Port)
	for proxyConn := range listener.Conns {
		go func(conn conn.Conn) {
			// fail gracefully if the proxy connection dies
			defer func() {
				if r := recover(); r != nil {
					conn.Warn("Failed with error: %v", r)
					conn.Close()
				}
			}()

			// read the proxy register message
			var regPxy msg.RegProxyMsg
			if err = msg.ReadMsgInto(conn, &regPxy); err != nil {
				panic(err)
			}

			// look up the tunnel for this proxy
			conn.Info("Registering new proxy for %s", regPxy.Url)
			tunnel := tunnels.Get(regPxy.Url)
			if tunnel == nil {
				panic("No tunnel found for: " + regPxy.Url)
			}

			// register the proxy connection with the tunnel
			tunnel.RegisterProxy(conn)
		}(proxyConn)
	}
}

// Establishes and manages a tunnel control connection with the server
func (c *ClientModel) control() {
	defer func() {
		if r := recover(); r != nil {
			log.Error("control recovering from failure %v", r)
		}
	}()

	// establish control channel
	var (
		ctlConn conn.Conn
		err     error
	)
	if c.proxyUrl == "" {
		// simple non-proxied case, just connect to the server
		ctlConn, err = conn.Dial(c.serverAddr, "ctl", c.tlsConfig)
	} else {
		ctlConn, err = conn.DialHttpProxy(c.proxyUrl, c.serverAddr, "ctl", c.tlsConfig)
	}
	if err != nil {
		panic(err)
	}
	defer ctlConn.Close()

	// authenticate with the server
	auth := &msg.Auth{
		ClientId:  c.id,
		OS:        runtime.GOOS,
		Arch:      runtime.GOARCH,
		Version:   version.Proto,
		MmVersion: version.MajorMinor(),
		User:      c.authToken,
	}

	if err = msg.WriteMsg(ctlConn, auth); err != nil {
		panic(err)
	}

	// wait for the server to authenticate us
	var authResp msg.AuthResp
	if err = msg.ReadMsgInto(ctlConn, &authResp); err != nil {
		panic(err)
	}

	if authResp.Error != "" {
		emsg := fmt.Sprintf("Failed to authenticate to server: %s", authResp.Error)
		c.ctl.Shutdown(emsg)
		return
	}

	c.id = authResp.ClientId
	c.serverVersion = authResp.MmVersion
	c.Info("Authenticated with server, client id: %v", c.id)
	c.update()
	if err = SaveAuthToken(c.configPath, c.authToken); err != nil {
		c.Error("Failed to save auth token: %v", err)
	}

	// request tunnels
	reqIdToTunnelConfig := make(map[string]*TunnelConfiguration)
	for _, config := range c.tunnelConfig {
		// create the protocol list to ask for
		var protocols []string
		for proto, _ := range config.Protocols {
			protocols = append(protocols, proto)
		}

		reqTunnel := &msg.ReqTunnel{
			ReqId:      util.RandId(8),
			Protocol:   strings.Join(protocols, "+"),
			Hostname:   config.Hostname,
			Subdomain:  config.Subdomain,
			HttpAuth:   config.HttpAuth,
			RemotePort: config.RemotePort,
		}

		// send the tunnel request
		if err = msg.WriteMsg(ctlConn, reqTunnel); err != nil {
			panic(err)
		}

		// save request id association so we know which local address
		// to proxy to later
		reqIdToTunnelConfig[reqTunnel.ReqId] = config
	}

	// start the heartbeat
	lastPong := time.Now().UnixNano()
	c.ctl.Go(func() { c.heartbeat(&lastPong, ctlConn) })

	// main control loop
	for {
		var rawMsg msg.Message
		if rawMsg, err = msg.ReadMsg(ctlConn); err != nil {
			panic(err)
		}

		switch m := rawMsg.(type) {
		case *msg.ReqProxy:
			c.ctl.Go(c.proxy)
//.........这里部分代码省略.........

// Establishes and manages a tunnel proxy connection with the server
func (c *ClientModel) proxy() {
	var (
		remoteConn conn.Conn
		err        error
	)

	if c.proxyUrl == "" {
		remoteConn, err = conn.Dial(c.serverAddr, "pxy", c.tlsConfig)
	} else {
		remoteConn, err = conn.DialHttpProxy(c.proxyUrl, c.serverAddr, "pxy", c.tlsConfig)
	}

	if err != nil {
		log.Error("Failed to establish proxy connection: %v", err)
		return
	}
	defer remoteConn.Close()

	err = msg.WriteMsg(remoteConn, &msg.RegProxy{ClientId: c.id})
	if err != nil {
		remoteConn.Error("Failed to write RegProxy: %v", err)
		return
	}

	// wait for the server to ack our register
	var startPxy msg.StartProxy
	if err = msg.ReadMsgInto(remoteConn, &startPxy); err != nil {
		remoteConn.Error("Server failed to write StartProxy: %v", err)
		return
	}

	tunnel, ok := c.tunnels[startPxy.Url]
	if !ok {
		remoteConn.Error("Couldn't find tunnel for proxy: %s", startPxy.Url)
		return
	}

	// start up the private connection
	start := time.Now()
	localConn, err := conn.Dial(tunnel.LocalAddr, "prv", nil)
	if err != nil {
		remoteConn.Warn("Failed to open private leg %s: %v", tunnel.LocalAddr, err)

		if tunnel.Protocol.GetName() == "http" {
			// try to be helpful when you're in HTTP mode and a human might see the output
			badGatewayBody := fmt.Sprintf(BadGateway, tunnel.PublicUrl, tunnel.LocalAddr, tunnel.LocalAddr)
			remoteConn.Write([]byte(fmt.Sprintf(`HTTP/1.0 502 Bad Gateway
Content-Type: text/html
Content-Length: %d

%s`, len(badGatewayBody), badGatewayBody)))
		}
		return
	}
	defer localConn.Close()

	m := c.metrics
	m.proxySetupTimer.Update(time.Since(start))
	m.connMeter.Mark(1)
	c.update()
	m.connTimer.Time(func() {
		localConn := tunnel.Protocol.WrapConn(localConn, mvc.ConnectionContext{Tunnel: tunnel, ClientAddr: startPxy.ClientAddr})
		bytesIn, bytesOut := conn.Join(localConn, remoteConn)
		m.bytesIn.Update(bytesIn)
		m.bytesOut.Update(bytesOut)
		m.bytesInCount.Inc(bytesIn)
		m.bytesOutCount.Inc(bytesOut)
	})
	c.update()
}

/**
 * Establishes and manages a tunnel control connection with the server
 */
func control(s *State, ctl *ui.Controller) {
	defer func() {
		if r := recover(); r != nil {
			log.Error("control recovering from failure %v", r)
		}
	}()

	// establish control channel
	conn, err := conn.Dial(s.opts.server, "ctl", tlsConfig)
	if err != nil {
		panic(err)
	}
	defer conn.Close()

	// register with the server
	err = msg.WriteMsg(conn, &msg.RegMsg{
		Protocol:  s.opts.protocol,
		OS:        runtime.GOOS,
		HttpAuth:  s.opts.httpAuth,
		Hostname:  s.opts.hostname,
		Subdomain: s.opts.subdomain,
		ClientId:  s.id,
		Version:   version.Proto,
		MmVersion: version.MajorMinor(),
		User:      s.opts.authtoken,
	})

	if err != nil {
		panic(err)
	}

	// wait for the server to ack our register
	var regAck msg.RegAckMsg
	if err = msg.ReadMsgInto(conn, &regAck); err != nil {
		panic(err)
	}

	if regAck.Error != "" {
		emsg := fmt.Sprintf("Server failed to allocate tunnel: %s", regAck.Error)
		ctl.Cmds <- ui.CmdQuit{Message: emsg}
		return
	}

	// update UI state
	s.publicUrl = regAck.Url
	conn.Info("Tunnel established at %v", s.GetPublicUrl())
	s.status = "online"
	s.serverVersion = regAck.MmVersion
	ctl.Update(s)

	SaveAuthToken(s.opts.authtoken)

	// start the heartbeat
	lastPong := time.Now().UnixNano()
	go heartbeat(&lastPong, conn)

	// main control loop
	for {
		var m msg.Message
		if m, err = msg.ReadMsg(conn); err != nil {
			panic(err)
		}

		switch m.(type) {
		case *msg.ReqProxyMsg:
			go proxy(regAck.ProxyAddr, s, ctl)

		case *msg.PongMsg:
			atomic.StoreInt64(&lastPong, time.Now().UnixNano())
		}
	}
}