cloudflared-mirror/supervisor/tunnel.go

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package supervisor
import (
"context"
"crypto/tls"
"fmt"
"net"
"runtime/debug"
"strings"
"sync"
"time"
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"github.com/google/uuid"
"github.com/lucas-clemente/quic-go"
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"github.com/pkg/errors"
"github.com/rs/zerolog"
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"golang.org/x/sync/errgroup"
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"github.com/cloudflare/cloudflared/connection"
"github.com/cloudflare/cloudflared/edgediscovery"
"github.com/cloudflare/cloudflared/edgediscovery/allregions"
"github.com/cloudflare/cloudflared/h2mux"
"github.com/cloudflare/cloudflared/orchestration"
quicpogs "github.com/cloudflare/cloudflared/quic"
"github.com/cloudflare/cloudflared/retry"
"github.com/cloudflare/cloudflared/signal"
"github.com/cloudflare/cloudflared/tunnelrpc"
tunnelpogs "github.com/cloudflare/cloudflared/tunnelrpc/pogs"
"github.com/cloudflare/cloudflared/tunnelstate"
)
const (
dialTimeout = 15 * time.Second
FeatureSerializedHeaders = "serialized_headers"
FeatureQuickReconnects = "quick_reconnects"
FeatureAllowRemoteConfig = "allow_remote_config"
FeatureDatagramV2 = "support_datagram_v2"
)
type TunnelConfig struct {
GracePeriod time.Duration
ReplaceExisting bool
OSArch string
ClientID string
CloseConnOnce *sync.Once // Used to close connectedSignal no more than once
EdgeAddrs []string
Region string
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EdgeIPVersion allregions.ConfigIPVersion
HAConnections int
IncidentLookup IncidentLookup
IsAutoupdated bool
LBPool string
Tags []tunnelpogs.Tag
Log *zerolog.Logger
LogTransport *zerolog.Logger
Observer *connection.Observer
ReportedVersion string
Retries uint
RunFromTerminal bool
NamedTunnel *connection.NamedTunnelProperties
ClassicTunnel *connection.ClassicTunnelProperties
MuxerConfig *connection.MuxerConfig
ProtocolSelector connection.ProtocolSelector
EdgeTLSConfigs map[connection.Protocol]*tls.Config
}
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: c.OSArch,
ExistingTunnelPolicy: policy,
PoolName: c.LBPool,
Tags: c.Tags,
ConnectionID: connectionID,
OriginLocalIP: OriginLocalIP,
IsAutoupdated: c.IsAutoupdated,
RunFromTerminal: c.RunFromTerminal,
CompressionQuality: uint64(c.MuxerConfig.CompressionSetting),
UUID: uuid.String(),
Features: c.SupportedFeatures(),
}
}
func (c *TunnelConfig) connectionOptions(originLocalAddr string, numPreviousAttempts uint8) *tunnelpogs.ConnectionOptions {
// attempt to parse out origin IP, but don't fail since it's informational field
host, _, _ := net.SplitHostPort(originLocalAddr)
originIP := net.ParseIP(host)
return &tunnelpogs.ConnectionOptions{
Client: c.NamedTunnel.Client,
OriginLocalIP: originIP,
ReplaceExisting: c.ReplaceExisting,
CompressionQuality: uint8(c.MuxerConfig.CompressionSetting),
NumPreviousAttempts: numPreviousAttempts,
}
}
func (c *TunnelConfig) SupportedFeatures() []string {
features := []string{FeatureSerializedHeaders}
if c.NamedTunnel == nil {
features = append(features, FeatureQuickReconnects)
}
return features
}
func StartTunnelDaemon(
ctx context.Context,
config *TunnelConfig,
orchestrator *orchestration.Orchestrator,
connectedSignal *signal.Signal,
reconnectCh chan ReconnectSignal,
graceShutdownC <-chan struct{},
) error {
s, err := NewSupervisor(config, orchestrator, reconnectCh, graceShutdownC)
if err != nil {
return err
}
return s.Run(ctx, connectedSignal)
}
// EdgeAddrHandler provides a mechanism switch between behaviors in ServeTunnel
// for handling the errors when attempting to make edge connections.
type EdgeAddrHandler interface {
// ShouldGetNewAddress will check the edge connection error and determine if
// the edge address should be replaced with a new one. Also, will return if the
// error should be recognized as a connectivity error, or otherwise, a general
// application error.
ShouldGetNewAddress(err error) (needsNewAddress bool, isConnectivityError bool)
}
// DefaultAddrFallback will always return false for isConnectivityError since this
// handler is a way to provide the legacy behavior in the new edge discovery algorithm.
type DefaultAddrFallback struct {
edgeErrors int
}
func (f DefaultAddrFallback) ShouldGetNewAddress(err error) (needsNewAddress bool, isConnectivityError bool) {
switch err.(type) {
case nil: // maintain current IP address
// DupConnRegisterTunnelError should indicate to get a new address immediately
case connection.DupConnRegisterTunnelError:
return true, false
// Try the next address if it was a quic.IdleTimeoutError
case *quic.IdleTimeoutError,
edgediscovery.DialError,
*connection.EdgeQuicDialError:
// Wait for two failures before falling back to a new address
f.edgeErrors++
if f.edgeErrors >= 2 {
f.edgeErrors = 0
return true, false
}
default: // maintain current IP address
}
return false, false
}
// IPAddrFallback will have more conditions to fall back to a new address for certain
// edge connection errors. This means that this handler will return true for isConnectivityError
// for more cases like duplicate connection register and edge quic dial errors.
type IPAddrFallback struct{}
func (f IPAddrFallback) ShouldGetNewAddress(err error) (needsNewAddress bool, isConnectivityError bool) {
switch err.(type) {
case nil: // maintain current IP address
// Try the next address if it was a quic.IdleTimeoutError
// DupConnRegisterTunnelError needs to also receive a new ip address
case connection.DupConnRegisterTunnelError,
*quic.IdleTimeoutError:
return true, false
// Network problems should be retried with new address immediately and report
// as connectivity error
case edgediscovery.DialError, *connection.EdgeQuicDialError:
return true, true
default: // maintain current IP address
}
return false, false
}
type EdgeTunnelServer struct {
config *TunnelConfig
cloudflaredUUID uuid.UUID
orchestrator *orchestration.Orchestrator
credentialManager *reconnectCredentialManager
edgeAddrHandler EdgeAddrHandler
edgeAddrs *edgediscovery.Edge
reconnectCh chan ReconnectSignal
gracefulShutdownC <-chan struct{}
tracker *tunnelstate.ConnTracker
connAwareLogger *ConnAwareLogger
}
func (e EdgeTunnelServer) Serve(ctx context.Context, connIndex uint8, protocolFallback *protocolFallback, connectedSignal *signal.Signal) error {
haConnections.Inc()
defer haConnections.Dec()
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)
// Fetch IP address to associated connection index
addr, err := e.edgeAddrs.GetAddr(int(connIndex))
switch err.(type) {
case nil: // no error
case edgediscovery.ErrNoAddressesLeft:
return err
default:
return err
}
logger := e.config.Log.With().
IPAddr(connection.LogFieldIPAddress, addr.UDP.IP).
Uint8(connection.LogFieldConnIndex, connIndex).
Logger()
connLog := e.connAwareLogger.ReplaceLogger(&logger)
// Each connection to keep its own copy of protocol, because individual connections might fallback
// to another protocol when a particular metal doesn't support new protocol
// Each connection can also have it's own IP version because individual connections might fallback
// to another IP version.
err, recoverable := ServeTunnel(
ctx,
connLog,
e.credentialManager,
e.config,
e.orchestrator,
addr,
connIndex,
connectedFuse,
protocolFallback,
e.cloudflaredUUID,
e.reconnectCh,
protocolFallback.protocol,
e.gracefulShutdownC,
)
// If the connection is recoverable, we want to maintain the same IP
// but backoff a reconnect with some duration.
if recoverable {
duration, ok := protocolFallback.GetMaxBackoffDuration(ctx)
if !ok {
return err
}
e.config.Observer.SendReconnect(connIndex)
connLog.Logger().Info().Msgf("Retrying connection in up to %s seconds", duration)
}
// Check if the connection error was from an IP issue with the host or
// establishing a connection to the edge and if so, rotate the IP address.
yes, hasConnectivityError := e.edgeAddrHandler.ShouldGetNewAddress(err)
if yes {
if _, err := e.edgeAddrs.GetDifferentAddr(int(connIndex), hasConnectivityError); err != nil {
return err
}
}
select {
case <-ctx.Done():
return ctx.Err()
case <-e.gracefulShutdownC:
return nil
case <-protocolFallback.BackoffTimer():
if !recoverable {
return err
}
// If a single connection has connected with the current protocol, we know we know we don't have to fallback
// to a different protocol.
if e.tracker.HasConnectedWith(e.config.ProtocolSelector.Current()) {
return err
}
if !selectNextProtocol(
connLog.Logger(),
protocolFallback,
e.config.ProtocolSelector,
err,
) {
return err
}
}
return err
}
// protocolFallback is a wrapper around backoffHandler that will try fallback option when backoff reaches
// max retries
type protocolFallback struct {
retry.BackoffHandler
protocol connection.Protocol
inFallback bool
}
func (pf *protocolFallback) reset() {
pf.ResetNow()
pf.inFallback = false
}
func (pf *protocolFallback) fallback(fallback connection.Protocol) {
pf.ResetNow()
pf.protocol = fallback
pf.inFallback = true
}
// selectNextProtocol picks connection protocol for the next retry iteration,
// returns true if it was able to pick the protocol, false if we are out of options and should stop retrying
func selectNextProtocol(
connLog *zerolog.Logger,
protocolBackoff *protocolFallback,
selector connection.ProtocolSelector,
cause error,
) bool {
var idleTimeoutError *quic.IdleTimeoutError
isNetworkActivityTimeout := errors.As(cause, &idleTimeoutError)
edgeQuicDialError, ok := cause.(*connection.EdgeQuicDialError)
if !isNetworkActivityTimeout && ok {
isNetworkActivityTimeout = errors.As(edgeQuicDialError.Cause, &idleTimeoutError)
}
_, hasFallback := selector.Fallback()
if protocolBackoff.ReachedMaxRetries() || (hasFallback && isNetworkActivityTimeout) {
if isNetworkActivityTimeout {
connLog.Warn().Msg("If this log occurs persistently, and cloudflared is unable to connect to " +
"Cloudflare Network with `quic` protocol, then most likely your machine/network is getting its egress " +
"UDP to port 7844 (or others) blocked or dropped. Make sure to allow egress connectivity as per " +
"https://developers.cloudflare.com/cloudflare-one/connections/connect-apps/configuration/ports-and-ips/\n" +
"If you are using private routing to this Tunnel, then UDP (and Private DNS Resolution) will not work " +
"unless your cloudflared can connect with Cloudflare Network with `quic`.")
}
fallback, hasFallback := selector.Fallback()
if !hasFallback {
return false
}
// Already using fallback protocol, no point to retry
if protocolBackoff.protocol == fallback {
return false
}
connLog.Info().Msgf("Switching to fallback protocol %s", fallback)
protocolBackoff.fallback(fallback)
} else if !protocolBackoff.inFallback {
current := selector.Current()
if protocolBackoff.protocol != current {
protocolBackoff.protocol = current
connLog.Info().Msgf("Changing protocol to %s", current)
}
}
return true
}
// ServeTunnel runs a single tunnel connection, returns nil on graceful shutdown,
// on error returns a flag indicating if error can be retried
func ServeTunnel(
ctx context.Context,
connLog *ConnAwareLogger,
credentialManager *reconnectCredentialManager,
config *TunnelConfig,
orchestrator *orchestration.Orchestrator,
addr *allregions.EdgeAddr,
connIndex uint8,
fuse *h2mux.BooleanFuse,
backoff *protocolFallback,
cloudflaredUUID uuid.UUID,
reconnectCh chan ReconnectSignal,
protocol connection.Protocol,
gracefulShutdownC <-chan struct{},
) (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)
}
err = errors.Wrapf(err, "stack trace: %s", string(debug.Stack()))
recoverable = true
}
}()
defer config.Observer.SendDisconnect(connIndex)
err, recoverable = serveTunnel(
ctx,
connLog,
credentialManager,
config,
orchestrator,
addr,
connIndex,
fuse,
backoff,
cloudflaredUUID,
reconnectCh,
protocol,
gracefulShutdownC,
)
if err != nil {
switch err := err.(type) {
case connection.DupConnRegisterTunnelError:
connLog.ConnAwareLogger().Err(err).Msg("Unable to establish connection.")
// don't retry this connection anymore, let supervisor pick a new address
return err, false
case connection.ServerRegisterTunnelError:
connLog.ConnAwareLogger().Err(err).Msg("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 {
connLog.ConnAwareLogger().Msg(activeIncidentsMsg(incidents))
}
return err.Cause, !err.Permanent
case *connection.EdgeQuicDialError:
return err, true
case ReconnectSignal:
connLog.Logger().Info().
IPAddr(connection.LogFieldIPAddress, addr.UDP.IP).
Uint8(connection.LogFieldConnIndex, connIndex).
Msgf("Restarting connection due to reconnect signal in %s", err.Delay)
err.DelayBeforeReconnect()
return err, true
default:
if err == context.Canceled {
connLog.Logger().Debug().Err(err).Msgf("Serve tunnel error")
return err, false
}
connLog.ConnAwareLogger().Err(err).Msgf("Serve tunnel error")
_, permanent := err.(unrecoverableError)
return err, !permanent
}
}
return nil, false
}
func serveTunnel(
ctx context.Context,
connLog *ConnAwareLogger,
credentialManager *reconnectCredentialManager,
config *TunnelConfig,
orchestrator *orchestration.Orchestrator,
addr *allregions.EdgeAddr,
connIndex uint8,
fuse *h2mux.BooleanFuse,
backoff *protocolFallback,
cloudflaredUUID uuid.UUID,
reconnectCh chan ReconnectSignal,
protocol connection.Protocol,
gracefulShutdownC <-chan struct{},
) (err error, recoverable bool) {
connectedFuse := &connectedFuse{
fuse: fuse,
backoff: backoff,
}
controlStream := connection.NewControlStream(
config.Observer,
connectedFuse,
config.NamedTunnel,
connIndex,
addr.UDP.IP,
nil,
gracefulShutdownC,
config.GracePeriod,
protocol,
)
switch protocol {
case connection.QUIC, connection.QUICWarp:
connOptions := config.connectionOptions(addr.UDP.String(), uint8(backoff.Retries()))
return ServeQUIC(ctx,
addr.UDP,
config,
orchestrator,
connLog,
connOptions,
controlStream,
connIndex,
reconnectCh,
gracefulShutdownC)
case connection.HTTP2, connection.HTTP2Warp:
edgeConn, err := edgediscovery.DialEdge(ctx, dialTimeout, config.EdgeTLSConfigs[protocol], addr.TCP)
if err != nil {
connLog.ConnAwareLogger().Err(err).Msg("Unable to establish connection with Cloudflare edge")
return err, true
}
connOptions := config.connectionOptions(edgeConn.LocalAddr().String(), uint8(backoff.Retries()))
if err := ServeHTTP2(
ctx,
connLog,
config,
orchestrator,
edgeConn,
connOptions,
controlStream,
connIndex,
gracefulShutdownC,
reconnectCh,
); err != nil {
return err, false
}
default:
edgeConn, err := edgediscovery.DialEdge(ctx, dialTimeout, config.EdgeTLSConfigs[protocol], addr.TCP)
if err != nil {
connLog.ConnAwareLogger().Err(err).Msg("Unable to establish connection with Cloudflare edge")
return err, true
}
if err := ServeH2mux(
ctx,
connLog,
credentialManager,
config,
orchestrator,
edgeConn,
connIndex,
connectedFuse,
cloudflaredUUID,
reconnectCh,
gracefulShutdownC,
); err != nil {
return err, false
}
}
return
}
type unrecoverableError struct {
err error
}
func (r unrecoverableError) Error() string {
return r.err.Error()
}
func ServeH2mux(
ctx context.Context,
connLog *ConnAwareLogger,
credentialManager *reconnectCredentialManager,
config *TunnelConfig,
orchestrator *orchestration.Orchestrator,
edgeConn net.Conn,
connIndex uint8,
connectedFuse *connectedFuse,
cloudflaredUUID uuid.UUID,
reconnectCh chan ReconnectSignal,
gracefulShutdownC <-chan struct{},
) error {
connLog.Logger().Debug().Msgf("Connecting via h2mux")
// Returns error from parsing the origin URL or handshake errors
handler, err, recoverable := connection.NewH2muxConnection(
orchestrator,
config.GracePeriod,
config.MuxerConfig,
edgeConn,
connIndex,
config.Observer,
gracefulShutdownC,
config.Log,
)
if err != nil {
if !recoverable {
return unrecoverableError{err}
}
return err
}
errGroup, serveCtx := errgroup.WithContext(ctx)
errGroup.Go(func() error {
if config.NamedTunnel != nil {
connOptions := config.connectionOptions(edgeConn.LocalAddr().String(), uint8(connectedFuse.backoff.Retries()))
return handler.ServeNamedTunnel(serveCtx, config.NamedTunnel, connOptions, connectedFuse)
}
registrationOptions := config.registrationOptions(connIndex, edgeConn.LocalAddr().String(), cloudflaredUUID)
return handler.ServeClassicTunnel(serveCtx, config.ClassicTunnel, credentialManager, registrationOptions, connectedFuse)
})
errGroup.Go(func() error {
return listenReconnect(serveCtx, reconnectCh, gracefulShutdownC)
})
return errGroup.Wait()
}
func ServeHTTP2(
ctx context.Context,
connLog *ConnAwareLogger,
config *TunnelConfig,
orchestrator *orchestration.Orchestrator,
tlsServerConn net.Conn,
connOptions *tunnelpogs.ConnectionOptions,
controlStreamHandler connection.ControlStreamHandler,
connIndex uint8,
gracefulShutdownC <-chan struct{},
reconnectCh chan ReconnectSignal,
) error {
connLog.Logger().Debug().Msgf("Connecting via http2")
h2conn := connection.NewHTTP2Connection(
tlsServerConn,
orchestrator,
connOptions,
config.Observer,
connIndex,
controlStreamHandler,
config.Log,
)
errGroup, serveCtx := errgroup.WithContext(ctx)
errGroup.Go(func() error {
return h2conn.Serve(serveCtx)
})
errGroup.Go(func() error {
err := listenReconnect(serveCtx, reconnectCh, gracefulShutdownC)
if err != nil {
// forcefully break the connection (this is only used for testing)
connLog.Logger().Debug().Msg("Forcefully breaking http2 connection")
_ = tlsServerConn.Close()
}
return err
})
return errGroup.Wait()
}
func ServeQUIC(
ctx context.Context,
edgeAddr *net.UDPAddr,
config *TunnelConfig,
orchestrator *orchestration.Orchestrator,
connLogger *ConnAwareLogger,
connOptions *tunnelpogs.ConnectionOptions,
controlStreamHandler connection.ControlStreamHandler,
connIndex uint8,
reconnectCh chan ReconnectSignal,
gracefulShutdownC <-chan struct{},
) (err error, recoverable bool) {
tlsConfig := config.EdgeTLSConfigs[connection.QUIC]
quicConfig := &quic.Config{
HandshakeIdleTimeout: quicpogs.HandshakeIdleTimeout,
MaxIdleTimeout: quicpogs.MaxIdleTimeout,
KeepAlivePeriod: quicpogs.MaxIdlePingPeriod,
MaxIncomingStreams: connection.MaxConcurrentStreams,
MaxIncomingUniStreams: connection.MaxConcurrentStreams,
EnableDatagrams: true,
MaxDatagramFrameSize: quicpogs.MaxDatagramFrameSize,
Tracer: quicpogs.NewClientTracer(connLogger.Logger(), connIndex),
}
quicConn, err := connection.NewQUICConnection(
quicConfig,
edgeAddr,
tlsConfig,
orchestrator,
connOptions,
controlStreamHandler,
connLogger.Logger())
if err != nil {
connLogger.ConnAwareLogger().Err(err).Msgf("Failed to create new quic connection")
return err, true
}
errGroup, serveCtx := errgroup.WithContext(ctx)
errGroup.Go(func() error {
err := quicConn.Serve(serveCtx)
if err != nil {
connLogger.ConnAwareLogger().Err(err).Msg("Failed to serve quic connection")
}
return err
})
errGroup.Go(func() error {
err := listenReconnect(serveCtx, reconnectCh, gracefulShutdownC)
if err != nil {
// forcefully break the connection (this is only used for testing)
connLogger.Logger().Debug().Msg("Forcefully breaking quic connection")
quicConn.Close()
}
return err
})
return errGroup.Wait(), false
}
func listenReconnect(ctx context.Context, reconnectCh <-chan ReconnectSignal, gracefulShutdownCh <-chan struct{}) error {
select {
case reconnect := <-reconnectCh:
return reconnect
case <-gracefulShutdownCh:
return nil
case <-ctx.Done():
return nil
}
}
type connectedFuse struct {
fuse *h2mux.BooleanFuse
backoff *protocolFallback
}
func (cf *connectedFuse) Connected() {
cf.fuse.Fuse(true)
cf.backoff.reset()
}
func (cf *connectedFuse) IsConnected() bool {
return cf.fuse.Value()
}
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, "; ")
}