// 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("无法连接代理服务器 %v ，错误：%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 协议握手错误：%v", err)
}
if p.insecureSkipVerify == false && tlsConn.VerifyHostname(p.proxyDomain) != nil {
tlsConn.Close()
return nil, fmt.Errorf("TLS 协议域名验证失败：%v", err)
}
c = tlsConn
}
req, err := http.NewRequest("CONNECT", p.proxyAddr, nil)
if err != nil {
c.Close()
return nil, fmt.Errorf("创建请求错误：%v", err)
}
req.URL.Path = raddr
req.URL.Host = p.proxyAddr
if err := req.Write(c); err != nil {
c.Close()
return nil, fmt.Errorf("写请求错误：%v", err)
}
br := bufio.NewReader(c)
res, err := http.ReadResponse(br, req)
if err != nil {
c.Close()
return nil, fmt.Errorf("响应格式错误：%v", err)
}
if res.StatusCode != 200 {
c.Close()
return nil, fmt.Errorf("响应错误：%v", res)
}
return &HttpTCPConn{c, rawConn, tlsConn, net.TCPAddr{}, net.TCPAddr{}, "", "", 0, 0, p, res.Body}, nil
}
func tryConnect(addr string, strict bool) (errchan chan error) {
errchan = make(chan error)
go func() {
caCertFile, err := ioutil.TempFile("", "logstash-forwarder-cacert")
if err != nil {
panic(err)
}
defer func() { os.Remove(caCertFile.Name()) }()
ioutil.WriteFile(caCertFile.Name(), []byte(caCert), os.ModeTemporary)
// this can be messy because of localhost resolving to ipv6 addresses
// but there's no easy way to disable v6 resolution here
const wait = 5
const retryLimit = 3
tryAttempt := 0
exinfo := ""
config := &NetworkConfig{
SSLCA: caCertFile.Name(),
Servers: []string{addr},
Timeout: wait,
timeout: time.Second * wait,
}
var socket *tls.Conn
for socket == nil && tryAttempt < retryLimit {
select {
case socket = <-doConnect(config):
case <-time.After(time.Second * wait):
log.Printf("INFO: Connect timeout: attempt: %d\n", tryAttempt)
tryAttempt++
}
}
if socket == nil {
errchan <- errors.New("Client connect failed. " + exinfo)
return
}
defer socket.Close()
log.Printf("INFO: Connected to %s\n", socket.RemoteAddr())
if !socket.ConnectionState().HandshakeComplete {
errchan <- errors.New("handshake should be complete")
return
}
errchan <- nil
}()
return errchan
}
func (r *invitationReceiver) Serve() {
if r.stop != nil {
return
}
r.stop = make(chan struct{})
for {
select {
case inv := <-r.invitations:
if debug {
l.Debugln("Received relay invitation", inv)
}
conn, err := client.JoinSession(inv)
if err != nil {
if debug {
l.Debugf("Failed to join relay session %s: %v", inv, err)
}
continue
}
err = osutil.SetTCPOptions(conn.(*net.TCPConn))
if err != nil {
l.Infoln(err)
}
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 <- model.IntermediateConnection{
tc, model.ConnectionTypeRelayAccept,
}
case <-r.stop:
return
}
}
}
// getChain is a helper function that retreives the host's certificate chain.
func getChain(addr string, config *tls.Config) (chain []*x509.Certificate, err error) {
var conn *tls.Conn
conn, err = tls.DialWithDialer(Dialer, Network, addr, config)
if err != nil {
return
}
err = conn.Close()
if err != nil {
return
}
chain = conn.ConnectionState().PeerCertificates
if len(chain) == 0 {
err = fmt.Errorf("%s returned empty certificate chain", addr)
}
return
}
// tlsDialScan tests that the host can perform a TLS Handshake
// and warns if the server's certificate can't be verified.
func tlsDialScan(addr, hostname string) (grade Grade, output Output, err error) {
var conn *tls.Conn
config := defaultTLSConfig(hostname)
if conn, err = tls.DialWithDialer(Dialer, Network, addr, config); err != nil {
return
}
conn.Close()
config.InsecureSkipVerify = false
if conn, err = tls.DialWithDialer(Dialer, Network, addr, config); err != nil {
grade = Warning
return
}
conn.Close()
grade = Good
return
}
// Wrap a net.Conn into a client tls connection, performing any
// additional verification as needed.
//
// As of go 1.3, crypto/tls only supports either doing no certificate
// verification, or doing full verification including of the peer's
// DNS name. For consul, we want to validate that the certificate is
// signed by a known CA, but because consul doesn't use DNS names for
// node names, we don't verify the certificate DNS names. Since go 1.3
// no longer supports this mode of operation, we have to do it
// manually.
func WrapTLSClient(conn net.Conn, tlsConfig *tls.Config) (net.Conn, error) {
var err error
var tlsConn *tls.Conn
tlsConn = tls.Client(conn, tlsConfig)
// If crypto/tls is doing verification, there's no need to do
// our own.
if tlsConfig.InsecureSkipVerify == false {
return tlsConn, nil
}
if err = tlsConn.Handshake(); err != nil {
tlsConn.Close()
return nil, err
}
// The following is lightly-modified from the doFullHandshake
// method in crypto/tls's handshake_client.go.
opts := x509.VerifyOptions{
Roots: tlsConfig.RootCAs,
CurrentTime: time.Now(),
DNSName: "",
Intermediates: x509.NewCertPool(),
}
certs := tlsConn.ConnectionState().PeerCertificates
for i, cert := range certs {
if i == 0 {
continue
}
opts.Intermediates.AddCert(cert)
}
_, err = certs[0].Verify(opts)
if err != nil {
tlsConn.Close()
return nil, err
}
return tlsConn, err
}
func clientFunc(conn *tls.Conn) error {
defer conn.Close()
if !conn.ConnectionState().HandshakeComplete {
return errors.New("handshake didn't complete")
}
input := []byte("Hello World!")
if _, err := conn.Write(input); err != nil {
return err
}
output, err := ioutil.ReadAll(conn)
if err != nil {
return err
}
if bytes.Compare(input, output) != 0 {
return errors.New("input and output do not match")
}
return nil
}
// ParseCertificateDomain parses the certificate served by the given domain.
func ParseCertificateDomain(domain string) (cert *Certificate, err error) {
var host, port string
if host, port, err = net.SplitHostPort(domain); err != nil {
host = domain
port = "443"
}
var conn *tls.Conn
conn, err = tls.DialWithDialer(&net.Dialer{Timeout: 10 * time.Second}, "tcp", net.JoinHostPort(host, port), &tls.Config{InsecureSkipVerify: true})
if err != nil {
return
}
defer conn.Close()
if len(conn.ConnectionState().PeerCertificates) == 0 {
return nil, errors.New("received no server certificates")
}
cert = ParseCertificate(conn.ConnectionState().PeerCertificates[0])
return
}
/**
* 监听APNSSocket的返回结果，当有返回时，意味着发生错误了，这时把错误发到channel，同时关闭socket。
*/
func monitorConn(conn *tls.Conn, app string, sandbox bool) {
defer CapturePanic(fmt.Sprint("panic when monitor Connection %s", app))
defer conn.Close()
reply := make([]byte, 6)
n, err := conn.Read(reply)
if err != nil && reply[0] != 8 {
if strings.HasSuffix(err.Error(), "use of closed network connection") {
log.Println("close the network connection")
return
} else {
log.Printf("error when read from socket %s, %d", err, n)
}
}
log.Printf("return %x, the id is %x", reply, reply[2:])
buf := bytes.NewBuffer(reply[2:])
var id int32
binary.Read(buf, binary.BigEndian, &id)
rsp := &APNSRespone{reply[0], reply[1], id, conn, app, sandbox}
responseCN <- rsp
}
func (s *connectionSvc) connectViaRelay(deviceID protocol.DeviceID, addr discover.Relay) *tls.Conn {
uri, err := url.Parse(addr.URL)
if err != nil {
l.Infoln("Failed to parse relay connection url:", addr, err)
return nil
}
inv, err := client.GetInvitationFromRelay(uri, deviceID, s.tlsCfg.Certificates)
if err != nil {
l.Debugf("Failed to get invitation for %s from %s: %v", deviceID, uri, err)
return nil
}
l.Debugln("Succesfully retrieved relay invitation", inv, "from", uri)
conn, err := client.JoinSession(inv)
if err != nil {
l.Debugf("Failed to join relay session %s: %v", inv, err)
return nil
}
l.Debugln("Successfully joined relay session", inv)
var tc *tls.Conn
if inv.ServerSocket {
tc = tls.Server(conn, s.tlsCfg)
} else {
tc = tls.Client(conn, s.tlsCfg)
}
err = tc.Handshake()
if err != nil {
l.Infof("TLS handshake (BEP/relay %s): %v", inv, err)
tc.Close()
return nil
}
return tc
}
func dialTLSWithOwnChecks(config *caretakerd.Config, tlsConfig *tls.Config) (net.Conn, error) {
var err error
var tlsConn *tls.Conn
address := config.RPC.Listen
tlsConn, err = tls.Dial(address.AsScheme(), address.AsAddress(), tlsConfig)
if err != nil {
return nil, err
}
if err = tlsConn.Handshake(); err != nil {
tlsConn.Close()
return nil, err
}
opts := x509.VerifyOptions{
Roots: tlsConfig.RootCAs,
CurrentTime: time.Now(),
DNSName: "",
Intermediates: x509.NewCertPool(),
}
certs := tlsConn.ConnectionState().PeerCertificates
for i, cert := range certs {
if i == 0 {
continue
}
opts.Intermediates.AddCert(cert)
}
_, err = certs[0].Verify(opts)
if err != nil {
tlsConn.Close()
return nil, err
}
return tlsConn, err
}
func testRoundTrip(t *testing.T, proxy *server.Server, origin *originHandler, checkerFn func(conn net.Conn, proxy *server.Server, originURL *url.URL)) {
var conn net.Conn
var err error
addr := proxy.Addr.String()
if !proxy.Tls {
conn, err = net.Dial("tcp", addr)
log.Debugf("%s -> %s (via HTTP) -> %s", conn.LocalAddr().String(), addr, origin.server.URL)
if !assert.NoError(t, err, "should dial proxy server") {
t.FailNow()
}
} else {
var tlsConn *tls.Conn
x509cert := serverCertificate.X509()
tlsConn, err = tls.Dial("tcp", addr, &tls.Config{
CipherSuites: preferredCipherSuites,
InsecureSkipVerify: true,
})
log.Debugf("%s -> %s (via HTTPS) -> %s", tlsConn.LocalAddr().String(), addr, origin.server.URL)
if !assert.NoError(t, err, "should dial proxy server") {
t.FailNow()
}
conn = tlsConn
if !tlsConn.ConnectionState().PeerCertificates[0].Equal(x509cert) {
if err := tlsConn.Close(); err != nil {
log.Errorf("Error closing chained server connection: %s", err)
}
t.Fatal("Server's certificate didn't match expected")
}
}
defer func() {
assert.NoError(t, conn.Close(), "should close connection")
}()
url, _ := url.Parse(origin.server.URL)
checkerFn(conn, proxy, url)
}
func (d *relayDialer) Dial(id protocol.DeviceID, uri *url.URL) (internalConn, error) {
inv, err := client.GetInvitationFromRelay(uri, id, d.tlsCfg.Certificates, 10*time.Second)
if err != nil {
return internalConn{}, err
}
conn, err := client.JoinSession(inv)
if err != nil {
return internalConn{}, err
}
err = dialer.SetTCPOptions(conn)
if err != nil {
conn.Close()
return internalConn{}, err
}
err = dialer.SetTrafficClass(conn, d.cfg.Options().TrafficClass)
if err != nil {
l.Debugf("failed to set traffic class: %s", err)
}
var tc *tls.Conn
if inv.ServerSocket {
tc = tls.Server(conn, d.tlsCfg)
} else {
tc = tls.Client(conn, d.tlsCfg)
}
err = tlsTimedHandshake(tc)
if err != nil {
tc.Close()
return internalConn{}, err
}
return internalConn{tc, connTypeRelayClient, relayPriority}, nil
}
func (t *relayListener) Serve() {
t.mut.Lock()
t.err = nil
t.mut.Unlock()
clnt, err := client.NewClient(t.uri, t.tlsCfg.Certificates, nil, 10*time.Second)
if err != nil {
t.mut.Lock()
t.err = err
t.mut.Unlock()
l.Warnln("listen (BEP/relay):", err)
return
}
go clnt.Serve()
t.mut.Lock()
t.client = clnt
t.mut.Unlock()
oldURI := clnt.URI()
for {
select {
case inv, ok := <-t.client.Invitations():
if !ok {
return
}
conn, err := client.JoinSession(inv)
if err != nil {
l.Warnln("Joining relay session (BEP/relay):", err)
continue
}
err = dialer.SetTCPOptions(conn.(*net.TCPConn))
if err != nil {
l.Infoln(err)
}
var tc *tls.Conn
if inv.ServerSocket {
tc = tls.Server(conn, t.tlsCfg)
} else {
tc = tls.Client(conn, t.tlsCfg)
}
err = tc.Handshake()
if err != nil {
tc.Close()
l.Infoln("TLS handshake (BEP/relay):", err)
continue
}
t.conns <- IntermediateConnection{tc, "Relay (Server)", relayPriority}
// Poor mans notifier that informs the connection service that the
// relay URI has changed. This can only happen when we connect to a
// relay via dynamic+http(s) pool, which upon a relay failing/dropping
// us, would pick a different one.
case <-time.After(10 * time.Second):
currentURI := clnt.URI()
if currentURI != oldURI {
oldURI = currentURI
t.notifyAddressesChanged(t)
}
}
}
}
func (s *connectionSvc) connect() {
delay := time.Second
for {
nextDevice:
for deviceID, deviceCfg := range s.cfg.Devices() {
if deviceID == myID {
continue
}
if s.model.IsPaused(deviceID) {
continue
}
connected := s.model.ConnectedTo(deviceID)
s.mut.RLock()
ct, ok := s.connType[deviceID]
relaysEnabled := s.relaysEnabled
s.mut.RUnlock()
if connected && ok && ct.IsDirect() {
continue
}
var addrs []string
var relays []discover.Relay
for _, addr := range deviceCfg.Addresses {
if addr == "dynamic" {
if s.discoverer != nil {
if t, r, err := s.discoverer.Lookup(deviceID); err == nil {
addrs = append(addrs, t...)
relays = append(relays, r...)
}
}
} else {
addrs = append(addrs, addr)
}
}
for _, addr := range addrs {
uri, err := url.Parse(addr)
if err != nil {
l.Infoln("Failed to parse connection url:", addr, err)
continue
}
dialer, ok := dialers[uri.Scheme]
if !ok {
l.Infoln("Unknown address schema", uri.String())
continue
}
if debugNet {
l.Debugln("dial", deviceCfg.DeviceID, uri.String())
}
conn, err := dialer(uri, s.tlsCfg)
if err != nil {
if debugNet {
l.Debugln("dial failed", deviceCfg.DeviceID, uri.String(), err)
}
continue
}
if connected {
s.model.Close(deviceID, fmt.Errorf("switching connections"))
}
s.conns <- model.IntermediateConnection{
conn, model.ConnectionTypeDirectDial,
}
continue nextDevice
}
// Only connect via relays if not already connected
// Also, do not set lastRelayCheck time if we have no relays,
// as otherwise when we do discover relays, we might have to
// wait up to RelayReconnectIntervalM to connect again.
// Also, do not try relays if we are explicitly told not to.
if connected || len(relays) == 0 || !relaysEnabled {
continue nextDevice
}
reconIntv := time.Duration(s.cfg.Options().RelayReconnectIntervalM) * time.Minute
if last, ok := s.lastRelayCheck[deviceID]; ok && time.Since(last) < reconIntv {
if debugNet {
l.Debugln("Skipping connecting via relay to", deviceID, "last checked at", last)
}
continue nextDevice
} else if debugNet {
l.Debugln("Trying relay connections to", deviceID, relays)
}
s.lastRelayCheck[deviceID] = time.Now()
for _, addr := range relays {
uri, err := url.Parse(addr.URL)
if err != nil {
l.Infoln("Failed to parse relay connection url:", addr, err)
continue
}
inv, err := client.GetInvitationFromRelay(uri, deviceID, s.tlsCfg.Certificates)
if err != nil {
if debugNet {
l.Debugf("Failed to get invitation for %s from %s: %v", deviceID, uri, err)
}
continue
} else if debugNet {
l.Debugln("Succesfully retrieved relay invitation", inv, "from", uri)
}
conn, err := client.JoinSession(inv)
if err != nil {
if debugNet {
l.Debugf("Failed to join relay session %s: %v", inv, err)
}
continue
} else if debugNet {
l.Debugln("Sucessfully joined relay session", inv)
}
err = osutil.SetTCPOptions(conn.(*net.TCPConn))
if err != nil {
l.Infoln(err)
}
var tc *tls.Conn
if inv.ServerSocket {
tc = tls.Server(conn, s.tlsCfg)
} else {
tc = tls.Client(conn, s.tlsCfg)
}
err = tc.Handshake()
if err != nil {
l.Infof("TLS handshake (BEP/relay %s): %v", inv, err)
tc.Close()
continue
}
s.conns <- model.IntermediateConnection{
tc, model.ConnectionTypeRelayDial,
}
continue nextDevice
}
}
time.Sleep(delay)
delay *= 2
if maxD := time.Duration(s.cfg.Options().ReconnectIntervalS) * time.Second; delay > maxD {
delay = maxD
}
}
}
func DialURL(url *url.URL, transport http.RoundTripper) (net.Conn, error) {
dialAddr := netutil.CanonicalAddr(url)
dialer, _ := utilnet.Dialer(transport)
switch url.Scheme {
case "http":
if dialer != nil {
return dialer("tcp", dialAddr)
}
return net.Dial("tcp", dialAddr)
case "https":
// Get the tls config from the transport if we recognize it
var tlsConfig *tls.Config
var tlsConn *tls.Conn
var err error
tlsConfig, _ = utilnet.TLSClientConfig(transport)
if dialer != nil {
// We have a dialer; use it to open the connection, then
// create a tls client using the connection.
netConn, err := dialer("tcp", dialAddr)
if err != nil {
return nil, err
}
if tlsConfig == nil {
// tls.Client requires non-nil config
glog.Warningf("using custom dialer with no TLSClientConfig. Defaulting to InsecureSkipVerify")
// tls.Handshake() requires ServerName or InsecureSkipVerify
tlsConfig = &tls.Config{
InsecureSkipVerify: true,
}
} else if len(tlsConfig.ServerName) == 0 && !tlsConfig.InsecureSkipVerify {
// tls.Handshake() requires ServerName or InsecureSkipVerify
// infer the ServerName from the hostname we're connecting to.
inferredHost := dialAddr
if host, _, err := net.SplitHostPort(dialAddr); err == nil {
inferredHost = host
}
// Make a copy to avoid polluting the provided config
tlsConfigCopy := *tlsConfig
tlsConfigCopy.ServerName = inferredHost
tlsConfig = &tlsConfigCopy
}
tlsConn = tls.Client(netConn, tlsConfig)
if err := tlsConn.Handshake(); err != nil {
netConn.Close()
return nil, err
}
} else {
// Dial
tlsConn, err = tls.Dial("tcp", dialAddr, tlsConfig)
if err != nil {
return nil, err
}
}
// Return if we were configured to skip validation
if tlsConfig != nil && tlsConfig.InsecureSkipVerify {
return tlsConn, nil
}
// Verify
host, _, _ := net.SplitHostPort(dialAddr)
if err := tlsConn.VerifyHostname(host); err != nil {
tlsConn.Close()
return nil, err
}
return tlsConn, nil
default:
return nil, fmt.Errorf("Unknown scheme: %s", url.Scheme)
}
}