781 lines
23 KiB
Go
781 lines
23 KiB
Go
package origin
|
|
|
|
import (
|
|
"bufio"
|
|
"context"
|
|
"crypto/tls"
|
|
"fmt"
|
|
"io"
|
|
"net"
|
|
"net/http"
|
|
"net/url"
|
|
"strconv"
|
|
"strings"
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/cloudflare/cloudflared/connection"
|
|
"github.com/cloudflare/cloudflared/h2mux"
|
|
"github.com/cloudflare/cloudflared/signal"
|
|
"github.com/cloudflare/cloudflared/tunnelrpc"
|
|
tunnelpogs "github.com/cloudflare/cloudflared/tunnelrpc/pogs"
|
|
"github.com/cloudflare/cloudflared/validation"
|
|
"github.com/cloudflare/cloudflared/websocket"
|
|
|
|
raven "github.com/getsentry/raven-go"
|
|
"github.com/google/uuid"
|
|
"github.com/pkg/errors"
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
_ "github.com/prometheus/client_golang/prometheus"
|
|
log "github.com/sirupsen/logrus"
|
|
"golang.org/x/sync/errgroup"
|
|
rpc "zombiezen.com/go/capnproto2/rpc"
|
|
)
|
|
|
|
const (
|
|
dialTimeout = 15 * time.Second
|
|
openStreamTimeout = 30 * time.Second
|
|
lbProbeUserAgentPrefix = "Mozilla/5.0 (compatible; Cloudflare-Traffic-Manager/1.0; +https://www.cloudflare.com/traffic-manager/;"
|
|
TagHeaderNamePrefix = "Cf-Warp-Tag-"
|
|
DuplicateConnectionError = "EDUPCONN"
|
|
)
|
|
|
|
type TunnelConfig struct {
|
|
BuildInfo *BuildInfo
|
|
ClientID string
|
|
ClientTlsConfig *tls.Config
|
|
CloseConnOnce *sync.Once // Used to close connectedSignal no more than once
|
|
CompressionQuality uint64
|
|
EdgeAddrs []string
|
|
GracePeriod time.Duration
|
|
HAConnections int
|
|
HTTPTransport http.RoundTripper
|
|
HeartbeatInterval time.Duration
|
|
Hostname string
|
|
IncidentLookup IncidentLookup
|
|
IsAutoupdated bool
|
|
IsFreeTunnel bool
|
|
LBPool string
|
|
Logger *log.Logger
|
|
MaxHeartbeats uint64
|
|
Metrics *TunnelMetrics
|
|
MetricsUpdateFreq time.Duration
|
|
NoChunkedEncoding bool
|
|
OriginCert []byte
|
|
ReportedVersion string
|
|
Retries uint
|
|
RunFromTerminal bool
|
|
Tags []tunnelpogs.Tag
|
|
TlsConfig *tls.Config
|
|
TransportLogger *log.Logger
|
|
UseDeclarativeTunnel bool
|
|
WSGI bool
|
|
// OriginUrl may not be used if a user specifies a unix socket.
|
|
OriginUrl string
|
|
}
|
|
|
|
type dialError struct {
|
|
cause error
|
|
}
|
|
|
|
func (e dialError) Error() string {
|
|
return e.cause.Error()
|
|
}
|
|
|
|
type dupConnRegisterTunnelError struct{}
|
|
|
|
func (e dupConnRegisterTunnelError) Error() string {
|
|
return "already connected to this server"
|
|
}
|
|
|
|
type muxerShutdownError struct{}
|
|
|
|
func (e muxerShutdownError) Error() string {
|
|
return "muxer shutdown"
|
|
}
|
|
|
|
// RegisterTunnel error from server
|
|
type serverRegisterTunnelError struct {
|
|
cause error
|
|
permanent bool
|
|
}
|
|
|
|
func (e serverRegisterTunnelError) Error() string {
|
|
return e.cause.Error()
|
|
}
|
|
|
|
// RegisterTunnel error from client
|
|
type clientRegisterTunnelError struct {
|
|
cause error
|
|
}
|
|
|
|
func newClientRegisterTunnelError(cause error, counter *prometheus.CounterVec) clientRegisterTunnelError {
|
|
counter.WithLabelValues(cause.Error()).Inc()
|
|
return clientRegisterTunnelError{cause: cause}
|
|
}
|
|
|
|
func (e clientRegisterTunnelError) Error() string {
|
|
return e.cause.Error()
|
|
}
|
|
|
|
func (c *TunnelConfig) RegistrationOptions(connectionID uint8, OriginLocalIP string, uuid uuid.UUID) *tunnelpogs.RegistrationOptions {
|
|
policy := tunnelrpc.ExistingTunnelPolicy_balance
|
|
if c.HAConnections <= 1 && c.LBPool == "" {
|
|
policy = tunnelrpc.ExistingTunnelPolicy_disconnect
|
|
}
|
|
return &tunnelpogs.RegistrationOptions{
|
|
ClientID: c.ClientID,
|
|
Version: c.ReportedVersion,
|
|
OS: fmt.Sprintf("%s_%s", c.BuildInfo.GoOS, c.BuildInfo.GoArch),
|
|
ExistingTunnelPolicy: policy,
|
|
PoolName: c.LBPool,
|
|
Tags: c.Tags,
|
|
ConnectionID: connectionID,
|
|
OriginLocalIP: OriginLocalIP,
|
|
IsAutoupdated: c.IsAutoupdated,
|
|
RunFromTerminal: c.RunFromTerminal,
|
|
CompressionQuality: c.CompressionQuality,
|
|
UUID: uuid.String(),
|
|
}
|
|
}
|
|
|
|
func StartTunnelDaemon(config *TunnelConfig, shutdownC <-chan struct{}, connectedSignal *signal.Signal) error {
|
|
ctx, cancel := context.WithCancel(context.Background())
|
|
go func() {
|
|
<-shutdownC
|
|
cancel()
|
|
}()
|
|
|
|
u, err := uuid.NewRandom()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// If a user specified negative HAConnections, we will treat it as requesting 1 connection
|
|
if config.HAConnections > 1 {
|
|
if config.UseDeclarativeTunnel {
|
|
return connection.NewSupervisor(&connection.CloudflaredConfig{
|
|
ConnectionConfig: &connection.ConnectionConfig{
|
|
TLSConfig: config.TlsConfig,
|
|
HeartbeatInterval: config.HeartbeatInterval,
|
|
MaxHeartbeats: config.MaxHeartbeats,
|
|
Logger: config.Logger.WithField("subsystem", "connection_supervisor"),
|
|
},
|
|
OriginCert: config.OriginCert,
|
|
Tags: config.Tags,
|
|
EdgeAddrs: config.EdgeAddrs,
|
|
HAConnections: uint(config.HAConnections),
|
|
Logger: config.Logger,
|
|
}).Run(ctx)
|
|
}
|
|
return NewSupervisor(config).Run(ctx, connectedSignal, u)
|
|
} else {
|
|
addrs, err := connection.ResolveEdgeIPs(config.Logger, config.EdgeAddrs)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return ServeTunnelLoop(ctx, config, addrs[0], 0, connectedSignal, u)
|
|
}
|
|
}
|
|
|
|
func ServeTunnelLoop(ctx context.Context,
|
|
config *TunnelConfig,
|
|
addr *net.TCPAddr,
|
|
connectionID uint8,
|
|
connectedSignal *signal.Signal,
|
|
u uuid.UUID,
|
|
) error {
|
|
logger := config.Logger
|
|
config.Metrics.incrementHaConnections()
|
|
defer config.Metrics.decrementHaConnections()
|
|
backoff := BackoffHandler{MaxRetries: config.Retries}
|
|
connectedFuse := h2mux.NewBooleanFuse()
|
|
go func() {
|
|
if connectedFuse.Await() {
|
|
connectedSignal.Notify()
|
|
}
|
|
}()
|
|
// Ensure the above goroutine will terminate if we return without connecting
|
|
defer connectedFuse.Fuse(false)
|
|
for {
|
|
err, recoverable := ServeTunnel(ctx, config, addr, connectionID, connectedFuse, &backoff, u)
|
|
if recoverable {
|
|
if duration, ok := backoff.GetBackoffDuration(ctx); ok {
|
|
logger.Infof("Retrying in %s seconds", duration)
|
|
backoff.Backoff(ctx)
|
|
continue
|
|
}
|
|
}
|
|
return err
|
|
}
|
|
}
|
|
|
|
func ServeTunnel(
|
|
ctx context.Context,
|
|
config *TunnelConfig,
|
|
addr *net.TCPAddr,
|
|
connectionID uint8,
|
|
connectedFuse *h2mux.BooleanFuse,
|
|
backoff *BackoffHandler,
|
|
u uuid.UUID,
|
|
) (err error, recoverable bool) {
|
|
// Treat panics as recoverable errors
|
|
defer func() {
|
|
if r := recover(); r != nil {
|
|
var ok bool
|
|
err, ok = r.(error)
|
|
if !ok {
|
|
err = fmt.Errorf("ServeTunnel: %v", r)
|
|
}
|
|
recoverable = true
|
|
}
|
|
}()
|
|
|
|
connectionTag := uint8ToString(connectionID)
|
|
logger := config.Logger.WithField("connectionID", connectionTag)
|
|
|
|
// additional tags to send other than hostname which is set in cloudflared main package
|
|
tags := make(map[string]string)
|
|
tags["ha"] = connectionTag
|
|
|
|
// Returns error from parsing the origin URL or handshake errors
|
|
handler, originLocalIP, err := NewTunnelHandler(ctx, config, addr.String(), connectionID)
|
|
if err != nil {
|
|
errLog := config.Logger.WithError(err)
|
|
switch err.(type) {
|
|
case dialError:
|
|
errLog.Error("Unable to dial edge")
|
|
case h2mux.MuxerHandshakeError:
|
|
errLog.Error("Handshake failed with edge server")
|
|
default:
|
|
errLog.Error("Tunnel creation failure")
|
|
return err, false
|
|
}
|
|
return err, true
|
|
}
|
|
|
|
errGroup, serveCtx := errgroup.WithContext(ctx)
|
|
|
|
errGroup.Go(func() error {
|
|
err := RegisterTunnel(serveCtx, handler.muxer, config, connectionID, originLocalIP, u)
|
|
if err == nil {
|
|
connectedFuse.Fuse(true)
|
|
backoff.SetGracePeriod()
|
|
}
|
|
return err
|
|
})
|
|
|
|
errGroup.Go(func() error {
|
|
updateMetricsTickC := time.Tick(config.MetricsUpdateFreq)
|
|
for {
|
|
select {
|
|
case <-serveCtx.Done():
|
|
// UnregisterTunnel blocks until the RPC call returns
|
|
err := UnregisterTunnel(handler.muxer, config.GracePeriod, config.TransportLogger)
|
|
handler.muxer.Shutdown()
|
|
return err
|
|
case <-updateMetricsTickC:
|
|
handler.UpdateMetrics(connectionTag)
|
|
}
|
|
}
|
|
})
|
|
|
|
errGroup.Go(func() error {
|
|
// All routines should stop when muxer finish serving. When muxer is shutdown
|
|
// gracefully, it doesn't return an error, so we need to return errMuxerShutdown
|
|
// here to notify other routines to stop
|
|
err := handler.muxer.Serve(serveCtx)
|
|
if err == nil {
|
|
return muxerShutdownError{}
|
|
}
|
|
return err
|
|
})
|
|
|
|
err = errGroup.Wait()
|
|
if err != nil {
|
|
switch castedErr := err.(type) {
|
|
case dupConnRegisterTunnelError:
|
|
logger.Info("Already connected to this server, selecting a different one")
|
|
return err, true
|
|
case serverRegisterTunnelError:
|
|
logger.WithError(castedErr.cause).Error("Register tunnel error from server side")
|
|
// Don't send registration error return from server to Sentry. They are
|
|
// logged on server side
|
|
if incidents := config.IncidentLookup.ActiveIncidents(); len(incidents) > 0 {
|
|
logger.Error(activeIncidentsMsg(incidents))
|
|
}
|
|
return castedErr.cause, !castedErr.permanent
|
|
case clientRegisterTunnelError:
|
|
logger.WithError(castedErr.cause).Error("Register tunnel error on client side")
|
|
raven.CaptureError(castedErr.cause, tags)
|
|
return err, true
|
|
case muxerShutdownError:
|
|
logger.Infof("Muxer shutdown")
|
|
return err, true
|
|
default:
|
|
logger.WithError(err).Error("Serve tunnel error")
|
|
raven.CaptureError(err, tags)
|
|
return err, true
|
|
}
|
|
}
|
|
return nil, true
|
|
}
|
|
|
|
func IsRPCStreamResponse(headers []h2mux.Header) bool {
|
|
if len(headers) != 1 {
|
|
return false
|
|
}
|
|
if headers[0].Name != ":status" || headers[0].Value != "200" {
|
|
return false
|
|
}
|
|
return true
|
|
}
|
|
|
|
func RegisterTunnel(
|
|
ctx context.Context,
|
|
muxer *h2mux.Muxer,
|
|
config *TunnelConfig,
|
|
connectionID uint8,
|
|
originLocalIP string,
|
|
uuid uuid.UUID,
|
|
) error {
|
|
config.TransportLogger.Debug("initiating RPC stream to register")
|
|
stream, err := openStream(ctx, muxer)
|
|
if err != nil {
|
|
// RPC stream open error
|
|
return newClientRegisterTunnelError(err, config.Metrics.rpcFail)
|
|
}
|
|
if !IsRPCStreamResponse(stream.Headers) {
|
|
// stream response error
|
|
return newClientRegisterTunnelError(err, config.Metrics.rpcFail)
|
|
}
|
|
conn := rpc.NewConn(
|
|
tunnelrpc.NewTransportLogger(config.TransportLogger.WithField("subsystem", "rpc-register"), rpc.StreamTransport(stream)),
|
|
tunnelrpc.ConnLog(config.TransportLogger.WithField("subsystem", "rpc-transport")),
|
|
)
|
|
defer conn.Close()
|
|
ts := tunnelpogs.TunnelServer_PogsClient{Client: conn.Bootstrap(ctx)}
|
|
// Request server info without blocking tunnel registration; must use capnp library directly.
|
|
tsClient := tunnelrpc.TunnelServer{Client: ts.Client}
|
|
serverInfoPromise := tsClient.GetServerInfo(ctx, func(tunnelrpc.TunnelServer_getServerInfo_Params) error {
|
|
return nil
|
|
})
|
|
registration, err := ts.RegisterTunnel(
|
|
ctx,
|
|
config.OriginCert,
|
|
config.Hostname,
|
|
config.RegistrationOptions(connectionID, originLocalIP, uuid),
|
|
)
|
|
LogServerInfo(serverInfoPromise.Result(), connectionID, config.Metrics, config.Logger)
|
|
if err != nil {
|
|
// RegisterTunnel RPC failure
|
|
return newClientRegisterTunnelError(err, config.Metrics.regFail)
|
|
}
|
|
for _, logLine := range registration.LogLines {
|
|
config.Logger.Info(logLine)
|
|
}
|
|
|
|
if regErr := processRegisterTunnelError(registration.Err, registration.PermanentFailure, config.Metrics); regErr != nil {
|
|
return regErr
|
|
}
|
|
|
|
if registration.TunnelID != "" {
|
|
config.Metrics.tunnelsHA.AddTunnelID(connectionID, registration.TunnelID)
|
|
config.Logger.Infof("Each HA connection's tunnel IDs: %v", config.Metrics.tunnelsHA.String())
|
|
}
|
|
|
|
// Print out the user's trial zone URL in a nice box (if they requested and got one)
|
|
if isTrialTunnel := config.Hostname == ""; isTrialTunnel {
|
|
if url, err := url.Parse(registration.Url); err == nil {
|
|
for _, line := range asciiBox(trialZoneMsg(url.String()), 2) {
|
|
config.Logger.Infoln(line)
|
|
}
|
|
} else {
|
|
config.Logger.Errorln("Failed to connect tunnel, please try again.")
|
|
return fmt.Errorf("empty URL in response from Cloudflare edge")
|
|
}
|
|
}
|
|
|
|
config.Metrics.userHostnamesCounts.WithLabelValues(registration.Url).Inc()
|
|
|
|
config.Logger.Infof("Route propagating, it may take up to 1 minute for your new route to become functional")
|
|
return nil
|
|
}
|
|
|
|
func processRegisterTunnelError(err string, permanentFailure bool, metrics *TunnelMetrics) error {
|
|
if err == "" {
|
|
metrics.regSuccess.Inc()
|
|
return nil
|
|
}
|
|
|
|
metrics.regFail.WithLabelValues(err).Inc()
|
|
if err == DuplicateConnectionError {
|
|
return dupConnRegisterTunnelError{}
|
|
}
|
|
return serverRegisterTunnelError{
|
|
cause: fmt.Errorf("Server error: %s", err),
|
|
permanent: permanentFailure,
|
|
}
|
|
}
|
|
|
|
func UnregisterTunnel(muxer *h2mux.Muxer, gracePeriod time.Duration, logger *log.Logger) error {
|
|
logger.Debug("initiating RPC stream to unregister")
|
|
ctx := context.Background()
|
|
stream, err := openStream(ctx, muxer)
|
|
if err != nil {
|
|
// RPC stream open error
|
|
return err
|
|
}
|
|
if !IsRPCStreamResponse(stream.Headers) {
|
|
// stream response error
|
|
return err
|
|
}
|
|
conn := rpc.NewConn(
|
|
tunnelrpc.NewTransportLogger(logger.WithField("subsystem", "rpc-unregister"), rpc.StreamTransport(stream)),
|
|
tunnelrpc.ConnLog(logger.WithField("subsystem", "rpc-transport")),
|
|
)
|
|
defer conn.Close()
|
|
ts := tunnelpogs.TunnelServer_PogsClient{Client: conn.Bootstrap(ctx)}
|
|
// gracePeriod is encoded in int64 using capnproto
|
|
return ts.UnregisterTunnel(ctx, gracePeriod.Nanoseconds())
|
|
}
|
|
|
|
func openStream(ctx context.Context, muxer *h2mux.Muxer) (*h2mux.MuxedStream, error) {
|
|
openStreamCtx, cancel := context.WithTimeout(ctx, openStreamTimeout)
|
|
defer cancel()
|
|
return muxer.OpenStream(openStreamCtx, []h2mux.Header{
|
|
{Name: ":method", Value: "RPC"},
|
|
{Name: ":scheme", Value: "capnp"},
|
|
{Name: ":path", Value: "*"},
|
|
}, nil)
|
|
}
|
|
|
|
func LogServerInfo(
|
|
promise tunnelrpc.ServerInfo_Promise,
|
|
connectionID uint8,
|
|
metrics *TunnelMetrics,
|
|
logger *log.Logger,
|
|
) {
|
|
serverInfoMessage, err := promise.Struct()
|
|
if err != nil {
|
|
logger.WithError(err).Warn("Failed to retrieve server information")
|
|
return
|
|
}
|
|
serverInfo, err := tunnelpogs.UnmarshalServerInfo(serverInfoMessage)
|
|
if err != nil {
|
|
logger.WithError(err).Warn("Failed to retrieve server information")
|
|
return
|
|
}
|
|
logger.Infof("Connected to %s", serverInfo.LocationName)
|
|
metrics.registerServerLocation(uint8ToString(connectionID), serverInfo.LocationName)
|
|
}
|
|
|
|
func H2RequestHeadersToH1Request(h2 []h2mux.Header, h1 *http.Request) error {
|
|
for _, header := range h2 {
|
|
switch header.Name {
|
|
case ":method":
|
|
h1.Method = header.Value
|
|
case ":scheme":
|
|
case ":authority":
|
|
// Otherwise the host header will be based on the origin URL
|
|
h1.Host = header.Value
|
|
case ":path":
|
|
u, err := url.Parse(header.Value)
|
|
if err != nil {
|
|
return fmt.Errorf("unparseable path")
|
|
}
|
|
resolved := h1.URL.ResolveReference(u)
|
|
// prevent escaping base URL
|
|
if !strings.HasPrefix(resolved.String(), h1.URL.String()) {
|
|
return fmt.Errorf("invalid path")
|
|
}
|
|
h1.URL = resolved
|
|
case "content-length":
|
|
contentLength, err := strconv.ParseInt(header.Value, 10, 64)
|
|
if err != nil {
|
|
return fmt.Errorf("unparseable content length")
|
|
}
|
|
h1.ContentLength = contentLength
|
|
default:
|
|
h1.Header.Add(http.CanonicalHeaderKey(header.Name), header.Value)
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func H1ResponseToH2Response(h1 *http.Response) (h2 []h2mux.Header) {
|
|
h2 = []h2mux.Header{{Name: ":status", Value: fmt.Sprintf("%d", h1.StatusCode)}}
|
|
for headerName, headerValues := range h1.Header {
|
|
for _, headerValue := range headerValues {
|
|
h2 = append(h2, h2mux.Header{Name: strings.ToLower(headerName), Value: headerValue})
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
func FindCfRayHeader(h1 *http.Request) string {
|
|
return h1.Header.Get("Cf-Ray")
|
|
}
|
|
|
|
type TunnelHandler struct {
|
|
originUrl string
|
|
muxer *h2mux.Muxer
|
|
httpClient http.RoundTripper
|
|
tlsConfig *tls.Config
|
|
tags []tunnelpogs.Tag
|
|
metrics *TunnelMetrics
|
|
// connectionID is only used by metrics, and prometheus requires labels to be string
|
|
connectionID string
|
|
logger *log.Logger
|
|
noChunkedEncoding bool
|
|
}
|
|
|
|
var dialer = net.Dialer{DualStack: true}
|
|
|
|
// NewTunnelHandler returns a TunnelHandler, origin LAN IP and error
|
|
func NewTunnelHandler(ctx context.Context,
|
|
config *TunnelConfig,
|
|
addr string,
|
|
connectionID uint8,
|
|
) (*TunnelHandler, string, error) {
|
|
originURL, err := validation.ValidateUrl(config.OriginUrl)
|
|
if err != nil {
|
|
return nil, "", fmt.Errorf("unable to parse origin URL %#v", originURL)
|
|
}
|
|
h := &TunnelHandler{
|
|
originUrl: originURL,
|
|
httpClient: config.HTTPTransport,
|
|
tlsConfig: config.ClientTlsConfig,
|
|
tags: config.Tags,
|
|
metrics: config.Metrics,
|
|
connectionID: uint8ToString(connectionID),
|
|
logger: config.Logger,
|
|
noChunkedEncoding: config.NoChunkedEncoding,
|
|
}
|
|
if h.httpClient == nil {
|
|
h.httpClient = http.DefaultTransport
|
|
}
|
|
// Inherit from parent context so we can cancel (Ctrl-C) while dialing
|
|
dialCtx, dialCancel := context.WithTimeout(ctx, dialTimeout)
|
|
// TUN-92: enforce a timeout on dial and handshake (as tls.Dial does not support one)
|
|
plaintextEdgeConn, err := dialer.DialContext(dialCtx, "tcp", addr)
|
|
dialCancel()
|
|
if err != nil {
|
|
return nil, "", dialError{cause: errors.Wrap(err, "DialContext error")}
|
|
}
|
|
edgeConn := tls.Client(plaintextEdgeConn, config.TlsConfig)
|
|
edgeConn.SetDeadline(time.Now().Add(dialTimeout))
|
|
err = edgeConn.Handshake()
|
|
if err != nil {
|
|
return nil, "", dialError{cause: errors.Wrap(err, "Handshake with edge error")}
|
|
}
|
|
// clear the deadline on the conn; h2mux has its own timeouts
|
|
edgeConn.SetDeadline(time.Time{})
|
|
// Establish a muxed connection with the edge
|
|
// Client mux handshake with agent server
|
|
h.muxer, err = h2mux.Handshake(edgeConn, edgeConn, h2mux.MuxerConfig{
|
|
Timeout: 5 * time.Second,
|
|
Handler: h,
|
|
IsClient: true,
|
|
HeartbeatInterval: config.HeartbeatInterval,
|
|
MaxHeartbeats: config.MaxHeartbeats,
|
|
Logger: config.TransportLogger.WithFields(log.Fields{}),
|
|
CompressionQuality: h2mux.CompressionSetting(config.CompressionQuality),
|
|
})
|
|
if err != nil {
|
|
return h, "", errors.New("TLS handshake error")
|
|
}
|
|
return h, edgeConn.LocalAddr().String(), err
|
|
}
|
|
|
|
func (h *TunnelHandler) AppendTagHeaders(r *http.Request) {
|
|
for _, tag := range h.tags {
|
|
r.Header.Add(TagHeaderNamePrefix+tag.Name, tag.Value)
|
|
}
|
|
}
|
|
|
|
func (h *TunnelHandler) ServeStream(stream *h2mux.MuxedStream) error {
|
|
h.metrics.incrementRequests(h.connectionID)
|
|
req, err := http.NewRequest("GET", h.originUrl, h2mux.MuxedStreamReader{MuxedStream: stream})
|
|
if err != nil {
|
|
h.logger.WithError(err).Panic("Unexpected error from http.NewRequest")
|
|
}
|
|
err = H2RequestHeadersToH1Request(stream.Headers, req)
|
|
if err != nil {
|
|
h.logger.WithError(err).Error("invalid request received")
|
|
}
|
|
h.AppendTagHeaders(req)
|
|
cfRay := FindCfRayHeader(req)
|
|
lbProbe := isLBProbeRequest(req)
|
|
h.logRequest(req, cfRay, lbProbe)
|
|
if websocket.IsWebSocketUpgrade(req) {
|
|
conn, response, err := websocket.ClientConnect(req, h.tlsConfig)
|
|
if err != nil {
|
|
h.logError(stream, err)
|
|
} else {
|
|
stream.WriteHeaders(H1ResponseToH2Response(response))
|
|
defer conn.Close()
|
|
// Copy to/from stream to the undelying connection. Use the underlying
|
|
// connection because cloudflared doesn't operate on the message themselves
|
|
websocket.Stream(conn.UnderlyingConn(), stream)
|
|
h.metrics.incrementResponses(h.connectionID, "200")
|
|
h.logResponse(response, cfRay, lbProbe)
|
|
}
|
|
} else {
|
|
// Support for WSGI Servers by switching transfer encoding from chunked to gzip/deflate
|
|
if h.noChunkedEncoding {
|
|
req.TransferEncoding = []string{"gzip", "deflate"}
|
|
cLength, err := strconv.Atoi(req.Header.Get("Content-Length"))
|
|
if err == nil {
|
|
req.ContentLength = int64(cLength)
|
|
}
|
|
}
|
|
|
|
// Request origin to keep connection alive to improve performance
|
|
req.Header.Set("Connection", "keep-alive")
|
|
|
|
response, err := h.httpClient.RoundTrip(req)
|
|
|
|
if err != nil {
|
|
h.logError(stream, err)
|
|
} else {
|
|
defer response.Body.Close()
|
|
stream.WriteHeaders(H1ResponseToH2Response(response))
|
|
if h.isEventStream(response) {
|
|
h.writeEventStream(stream, response.Body)
|
|
} else {
|
|
// Use CopyBuffer, because Copy only allocates a 32KiB buffer, and cross-stream
|
|
// compression generates dictionary on first write
|
|
io.CopyBuffer(stream, response.Body, make([]byte, 512*1024))
|
|
}
|
|
|
|
h.metrics.incrementResponses(h.connectionID, "200")
|
|
h.logResponse(response, cfRay, lbProbe)
|
|
}
|
|
}
|
|
h.metrics.decrementConcurrentRequests(h.connectionID)
|
|
return nil
|
|
}
|
|
|
|
func (h *TunnelHandler) writeEventStream(stream *h2mux.MuxedStream, responseBody io.ReadCloser) {
|
|
reader := bufio.NewReader(responseBody)
|
|
for {
|
|
line, err := reader.ReadBytes('\n')
|
|
if err != nil {
|
|
break
|
|
}
|
|
stream.Write(line)
|
|
}
|
|
}
|
|
|
|
func (h *TunnelHandler) isEventStream(response *http.Response) bool {
|
|
if response.Header.Get("content-type") == "text/event-stream" {
|
|
h.logger.Debug("Detected Server-Side Events from Origin")
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
func (h *TunnelHandler) logError(stream *h2mux.MuxedStream, err error) {
|
|
h.logger.WithError(err).Error("HTTP request error")
|
|
stream.WriteHeaders([]h2mux.Header{{Name: ":status", Value: "502"}})
|
|
stream.Write([]byte("502 Bad Gateway"))
|
|
h.metrics.incrementResponses(h.connectionID, "502")
|
|
}
|
|
|
|
func (h *TunnelHandler) logRequest(req *http.Request, cfRay string, lbProbe bool) {
|
|
logger := log.NewEntry(h.logger)
|
|
if cfRay != "" {
|
|
logger = logger.WithField("CF-RAY", cfRay)
|
|
logger.Debugf("%s %s %s", req.Method, req.URL, req.Proto)
|
|
} else if lbProbe {
|
|
logger.Debugf("Load Balancer health check %s %s %s", req.Method, req.URL, req.Proto)
|
|
} else {
|
|
logger.Warnf("All requests should have a CF-RAY header. Please open a support ticket with Cloudflare. %s %s %s ", req.Method, req.URL, req.Proto)
|
|
}
|
|
logger.Debugf("Request Headers %+v", req.Header)
|
|
|
|
if contentLen := req.ContentLength; contentLen == -1 {
|
|
logger.Debugf("Request Content length unknown")
|
|
} else {
|
|
logger.Debugf("Request content length %d", contentLen)
|
|
}
|
|
}
|
|
|
|
func (h *TunnelHandler) logResponse(r *http.Response, cfRay string, lbProbe bool) {
|
|
logger := log.NewEntry(h.logger)
|
|
if cfRay != "" {
|
|
logger = logger.WithField("CF-RAY", cfRay)
|
|
logger.Debugf("%s", r.Status)
|
|
} else if lbProbe {
|
|
logger.Debugf("Response to Load Balancer health check %s", r.Status)
|
|
} else {
|
|
logger.Infof("%s", r.Status)
|
|
}
|
|
logger.Debugf("Response Headers %+v", r.Header)
|
|
|
|
if contentLen := r.ContentLength; contentLen == -1 {
|
|
logger.Debugf("Response content length unknown")
|
|
} else {
|
|
logger.Debugf("Response content length %d", contentLen)
|
|
}
|
|
}
|
|
|
|
func (h *TunnelHandler) UpdateMetrics(connectionID string) {
|
|
h.metrics.updateMuxerMetrics(connectionID, h.muxer.Metrics())
|
|
}
|
|
|
|
func uint8ToString(input uint8) string {
|
|
return strconv.FormatUint(uint64(input), 10)
|
|
}
|
|
|
|
func isLBProbeRequest(req *http.Request) bool {
|
|
return strings.HasPrefix(req.UserAgent(), lbProbeUserAgentPrefix)
|
|
}
|
|
|
|
// Print out the given lines in a nice ASCII box.
|
|
func asciiBox(lines []string, padding int) (box []string) {
|
|
maxLen := maxLen(lines)
|
|
spacer := strings.Repeat(" ", padding)
|
|
|
|
border := "+" + strings.Repeat("-", maxLen+(padding*2)) + "+"
|
|
|
|
box = append(box, border)
|
|
for _, line := range lines {
|
|
box = append(box, "|"+spacer+line+strings.Repeat(" ", maxLen-len(line))+spacer+"|")
|
|
}
|
|
box = append(box, border)
|
|
return
|
|
}
|
|
|
|
func maxLen(lines []string) int {
|
|
max := 0
|
|
for _, line := range lines {
|
|
if len(line) > max {
|
|
max = len(line)
|
|
}
|
|
}
|
|
return max
|
|
}
|
|
|
|
func trialZoneMsg(url string) []string {
|
|
return []string{
|
|
"Your free tunnel has started! Visit it:",
|
|
" " + url,
|
|
}
|
|
}
|
|
|
|
func activeIncidentsMsg(incidents []Incident) string {
|
|
preamble := "There is an active Cloudflare incident that may be related:"
|
|
if len(incidents) > 1 {
|
|
preamble = "There are active Cloudflare incidents that may be related:"
|
|
}
|
|
incidentStrings := []string{}
|
|
for _, incident := range incidents {
|
|
incidentString := fmt.Sprintf("%s (%s)", incident.Name, incident.URL())
|
|
incidentStrings = append(incidentStrings, incidentString)
|
|
}
|
|
return preamble + " " + strings.Join(incidentStrings, "; ")
|
|
|
|
}
|