Golang Conn.Close方法代碼示例

// Start the simple voice app on the encrypted channel.
func startVoiceApp(tlsconn *tls.Conn, remoteCN string) {
	// start the speaker part and connect it to our socket
	spr := exec.Command("/usr/bin/aplay")
	spr.Stdin = tlsconn
	err := spr.Start() // start asynchronously
	check(err)

	// start the microphone too
	// defaults: 1 channel 8000 Hz sample rate, WAVE format
	mic := exec.Command("/usr/bin/arecord")
	mic.Stdout = tlsconn
	err = mic.Start() // start asynchronously
	check(err)

	// TODO: write a ping to signal connection
	// mess := text_to_speech("Connected to %s, chat away!\n", remoteCN)
	// spr.Write([]byte(mess))

	// wait for it to finish
	// TODO: find a way to hang up the connection, short of killall arecord/aplay
	err = mic.Wait()
	check(err)
	err = spr.Wait()
	check(err)

	tlsconn.Close()
}

// checkErr logs if an error occurs and closes the tlsConn.
func checkErr(err error, tlsConn *tls.Conn) {
	if err != nil {
		tlsConn.Close()
		log.Fatalf("GBNetworkTools: %s\n", err.Error())

	}
}

func (d *relayDialer) Dial(id protocol.DeviceID, uri *url.URL) (IntermediateConnection, error) {
	inv, err := client.GetInvitationFromRelay(uri, id, d.tlsCfg.Certificates, 10*time.Second)
	if err != nil {
		return IntermediateConnection{}, err
	}

	conn, err := client.JoinSession(inv)
	if err != nil {
		return IntermediateConnection{}, err
	}

	err = dialer.SetTCPOptions(conn)
	if err != nil {
		conn.Close()
		return IntermediateConnection{}, err
	}

	var tc *tls.Conn
	if inv.ServerSocket {
		tc = tls.Server(conn, d.tlsCfg)
	} else {
		tc = tls.Client(conn, d.tlsCfg)
	}

	err = tc.Handshake()
	if err != nil {
		tc.Close()
		return IntermediateConnection{}, err
	}

	return IntermediateConnection{tc, "Relay (Client)", relayPriority}, nil
}

func main() {
	ripmgr := randip.NewRandIPv4Mgr(true, 1249767200)
	for {
		newIP, err := ripmgr.GetNextIP()
		if err != nil {
			log.Println("IP Addr Exhausted")
			return
		} else {
			go func() {
				log.Println(newIP.String())
				config := tls.Config{InsecureSkipVerify: true, ServerName: "google.com"}
				var err error
				var newConn *tls.Conn
				newConn, err = tls.DialWithDialer(&net.Dialer{Timeout: 2 * time.Second}, "tcp", newIP.String()+":443", &config)
				if err != nil {
					log.Println(err)
				} else {
					conState := newConn.ConnectionState()
					fmt.Println(newConn.RemoteAddr(), conState.PeerCertificates[0].NotBefore, conState.PeerCertificates[0].NotAfter, conState.PeerCertificates[0].SerialNumber)
					//jsonCert,_ := json.MarshalIndent(conState.PeerCertificates[0],""," ")
					//fmt.Println(string(jsonCert))
					newConn.Close()
				}
			}()
		}
	}
}

func closeAndCountFDs(t *testing.T, conn *tls.Conn, err error, fdStart int) {
	if err == nil {
		conn.Close()
	}
	fdEnd := countTCPFiles()
	assert.Equal(t, fdStart, fdEnd, "Number of open TCP files should be the same after test as before")
}

// SessionResumeScan tests that host is able to resume sessions across all addresses.
func sessionResumeScan(addr, hostname string) (grade Grade, output Output, err error) {
	config := defaultTLSConfig(hostname)
	config.ClientSessionCache = tls.NewLRUClientSessionCache(1)

	conn, err := tls.DialWithDialer(Dialer, Network, addr, config)
	if err != nil {
		return
	}
	if err = conn.Close(); err != nil {
		return
	}

	return multiscan(addr, func(addrport string) (g Grade, o Output, e error) {
		var conn *tls.Conn
		if conn, e = tls.DialWithDialer(Dialer, Network, addrport, config); e != nil {
			return
		}
		conn.Close()

		if o = conn.ConnectionState().DidResume; o.(bool) {
			g = Good
		}
		return
	})
}

func enrichWithOwnChecks(conn *tls.Conn, tlsConfig *tls.Config) error {
	var err error
	if err = conn.Handshake(); err != nil {
		conn.Close()
		return err
	}

	opts := x509.VerifyOptions{
		Roots:         tlsConfig.RootCAs,
		CurrentTime:   time.Now(),
		DNSName:       "",
		Intermediates: x509.NewCertPool(),
	}

	certs := conn.ConnectionState().PeerCertificates
	for i, cert := range certs {
		if i == 0 {
			continue
		}
		opts.Intermediates.AddCert(cert)
	}

	_, err = certs[0].Verify(opts)
	if err != nil {
		conn.Close()
		return err
	}

	return nil
}

func (r *invitationReceiver) Serve() {
	for {
		select {
		case inv := <-r.invitations:
			l.Debugln("Received relay invitation", inv)
			conn, err := client.JoinSession(inv)
			if err != nil {
				l.Debugf("Failed to join relay session %s: %v", inv, err)
				continue
			}

			var tc *tls.Conn

			if inv.ServerSocket {
				tc = tls.Server(conn, r.tlsCfg)
			} else {
				tc = tls.Client(conn, r.tlsCfg)
			}
			err = tc.Handshake()
			if err != nil {
				l.Infof("TLS handshake (BEP/relay %s): %v", inv, err)
				tc.Close()
				continue
			}
			r.conns <- tc

		case <-r.stop:
			return
		}
	}
}

// getChain returns chain of certificates retrieved from TLS session
// established at given addr (host:port) for hostname provided. If addr is
// empty, then hostname:443 is used.
func getChain(hostname, addr string) ([]*x509.Certificate, error) {
	if hostname == "" {
		return nil, errors.New("empty hostname")
	}
	var (
		conn *tls.Conn
		err  error
	)
	type tempErr interface {
		Temporary() bool
	}
	conf := &tls.Config{ServerName: hostname}
	if addr == "" {
		addr = hostname + ":443"
	}
	dialer := &net.Dialer{
		Timeout: 30 * time.Second,
	}
	for i := 0; i < 3; i++ {
		if i > 0 {
			time.Sleep(time.Duration(i) * time.Second)
		}
		conn, err = tls.DialWithDialer(dialer, "tcp", addr, conf)
		if e, ok := err.(tempErr); ok && e.Temporary() {
			continue
		}
		if err != nil {
			return nil, err
		}
		defer conn.Close()
		return conn.ConnectionState().PeerCertificates, nil
	}
	return nil, err
}

// Start the simple chat app on the encrypted channel.
func startChatApp(tlsconn *tls.Conn, remoteCN string) {
	// Create listener socket for the simple chat
	socket, err := net.Listen("tcp", "[::1]:0")
	check(err)
	port := getPort(socket.Addr().String())

	// start the chat app and point it to our socket
	cmd := exec.Command("uxterm", "-e", "nc", "-6", "::1", port)

	err = cmd.Start() // start asynchronously
	check(err)

	// wait for it to connect
	app, err := socket.Accept()
	check(err)

	// show a welcome message
	mess := fmt.Sprintf("Connected to %s, chat away!\n", remoteCN)
	app.Write([]byte(mess))
	app.Write([]byte(fmt.Sprintf("%s\n", strings.Repeat("-", len(mess)-1))))

	// copy the TLS-connection to the chat app and back
	go io.Copy(app, tlsconn)
	go io.Copy(tlsconn, app)

	// wait for it to finish
	err = cmd.Wait()
	check(err)

	// Close all, including the socket and the TLS channel.
	// We run this only once.
	app.Close()
	socket.Close()
	tlsconn.Close()
}

func closeAndCountFDs(t *testing.T, conn *tls.Conn, err error, fdc *fdcount.Counter) {
	if err == nil {
		if err := conn.Close(); err != nil {
			t.Fatalf("Unable to close connection: %v", err)
		}
	}
	assert.NoError(t, fdc.AssertDelta(0), "Number of open TCP files should be the same after test as before")
}

func ReadPacket(logger *log.Logger, conn *tls.Conn) (*Packet, error) {

	inbuf := make([]byte, 1024)
	br, err := conn.Read(inbuf)
	if err != nil {
		return nil, err
	}
	if br == 0 {
		return nil, errors.New("disconnected")
	}
	if br < 4 {
		return nil, errors.New("short read")
	}

	br = br - 4
	phead := inbuf[0:4]
	b := bytes.NewReader(phead)

	var pilen uint32
	err = binary.Read(b, binary.BigEndian, &pilen)
	plen := int(pilen) - 4
	if err != nil {
		conn.Close()
		return nil, err
	}

	pdata := inbuf[4:]
	for {
		if br >= plen {
			break
		}
		buf := make([]byte, (plen - br))
		nr, err := conn.Read(buf)
		if err != nil {
			conn.Close()
			return nil, err
		}
		if nr == 0 {
			return nil, err
		}
		pdata = append(pdata, buf...)
		br = br + nr
	}

	var p Packet
	err = json.Unmarshal(pdata[:plen], &p)

	if err != nil {
		return nil, err

	}
	return &p, nil
}

// CheckVerification checks with the server that the user is verified, and exits the binary if it is not.
func CheckVerification(tlsConn *tls.Conn, loginInfo, password string) {
	GBClientNetworkTools.WriteContentsToConn(tlsConn, "IS_ALREADY_VERIFIED", "1")
	GBClientNetworkTools.WriteContentsToConn(tlsConn, "USERNAME", loginInfo)
	GBClientNetworkTools.WriteContentsToConn(tlsConn, "PASSWORD", password)

	_, verified, _, err := GBClientNetworkTools.GetValueFromContentsBlock(tlsConn)
	checkErr(err, tlsConn)
	if verified != "true" {
		time.Sleep(1000 * time.Millisecond)
		tlsConn.Close()
		os.Exit(1)
	}
}

// GracefullyExit is the default exit method for the binary.
func GracefullyExit(tlsConn *tls.Conn, key []byte) {

	// Kill command to server
	err := GBClientNetworkTools.SendDataEncrypted(tlsConn, GBClientWatch.OutputData{"kill", true, 1, 1}, GBClientNetworkTools.DISCONNECT_CONST, key)
	if err != nil {
		fmt.Printf("Error: %s\n", err.Error())
	}

	// Allow time to send request
	time.Sleep(200 * time.Millisecond)

	tlsConn.Close()
	os.Exit(1)
}

func (p *httpProxyClient) DialTCPSAddr(network string, raddr string) (ProxyTCPConn, error) {
	var tlsConn *tls.Conn
	rawConn, err := p.upProxy.DialTCPSAddr(network, p.proxyAddr)
	if err != nil {
		return nil, fmt.Errorf("無法連接代理服務器 %v ，錯誤：%v", p.proxyAddr, err)
	}

	var c Conn = rawConn

	if p.proxyType == "https" {
		tlsConn = tls.Client(c, &tls.Config{ServerName: p.proxyDomain, InsecureSkipVerify: p.insecureSkipVerify})
		if err := tlsConn.Handshake(); err != nil {
			tlsConn.Close()
			return nil, fmt.Errorf("TLS 協議握手錯誤：%v", err)
		}
		if p.insecureSkipVerify == false && tlsConn.VerifyHostname(p.proxyDomain) != nil {
			tlsConn.Close()
			return nil, fmt.Errorf("TLS 協議域名驗證失敗：%v", err)
		}
		c = tlsConn
	}

	req, err := http.NewRequest("CONNECT", p.proxyAddr, nil)
	if err != nil {
		c.Close()
		return nil, fmt.Errorf("創建請求錯誤：%v", err)
	}
	req.URL.Path = raddr
	req.URL.Host = p.proxyAddr

	if err := req.Write(c); err != nil {
		c.Close()
		return nil, fmt.Errorf("寫請求錯誤：%v", err)
	}

	br := bufio.NewReader(c)

	res, err := http.ReadResponse(br, req)
	if err != nil {
		c.Close()
		return nil, fmt.Errorf("響應格式錯誤：%v", err)
	}

	if res.StatusCode != 200 {
		c.Close()
		return nil, fmt.Errorf("響應錯誤：%v", res)
	}

	return &HttpTCPConn{c, rawConn, tlsConn, net.TCPAddr{}, net.TCPAddr{}, "", "", 0, 0, p, res.Body}, nil
}