cloudflared-mirror/connection/rpc.go

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package connection
import (
"context"
"fmt"
"io"
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"net"
"time"
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"github.com/rs/zerolog"
"zombiezen.com/go/capnproto2/rpc"
"github.com/cloudflare/cloudflared/tunnelrpc"
tunnelpogs "github.com/cloudflare/cloudflared/tunnelrpc/pogs"
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)
type tunnelServerClient struct {
client tunnelpogs.TunnelServer_PogsClient
transport rpc.Transport
}
// NewTunnelRPCClient creates and returns a new RPC client, which will communicate using a stream on the given muxer.
// This method is exported for supervisor to call Authenticate RPC
func NewTunnelServerClient(
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ctx context.Context,
stream io.ReadWriteCloser,
log *zerolog.Logger,
) *tunnelServerClient {
transport := tunnelrpc.NewTransportLogger(log, rpc.StreamTransport(stream))
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conn := rpc.NewConn(
transport,
tunnelrpc.ConnLog(log),
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)
registrationClient := tunnelpogs.RegistrationServer_PogsClient{Client: conn.Bootstrap(ctx), Conn: conn}
return &tunnelServerClient{
client: tunnelpogs.TunnelServer_PogsClient{RegistrationServer_PogsClient: registrationClient, Client: conn.Bootstrap(ctx), Conn: conn},
transport: transport,
}
}
func (tsc *tunnelServerClient) Authenticate(ctx context.Context, classicTunnel *ClassicTunnelProperties, registrationOptions *tunnelpogs.RegistrationOptions) (tunnelpogs.AuthOutcome, error) {
authResp, err := tsc.client.Authenticate(ctx, classicTunnel.OriginCert, classicTunnel.Hostname, registrationOptions)
if err != nil {
return nil, err
}
return authResp.Outcome(), nil
}
func (tsc *tunnelServerClient) Close() {
// Closing the client will also close the connection
_ = tsc.client.Close()
_ = tsc.transport.Close()
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}
type NamedTunnelRPCClient interface {
RegisterConnection(
c context.Context,
config *NamedTunnelProperties,
options *tunnelpogs.ConnectionOptions,
connIndex uint8,
observer *Observer,
) (*tunnelpogs.ConnectionDetails, error)
SendLocalConfiguration(
c context.Context,
config []byte,
observer *Observer,
) error
GracefulShutdown(ctx context.Context, gracePeriod time.Duration)
Close()
}
type registrationServerClient struct {
client tunnelpogs.RegistrationServer_PogsClient
transport rpc.Transport
}
func newRegistrationRPCClient(
ctx context.Context,
stream io.ReadWriteCloser,
log *zerolog.Logger,
) NamedTunnelRPCClient {
transport := tunnelrpc.NewTransportLogger(log, rpc.StreamTransport(stream))
conn := rpc.NewConn(
transport,
tunnelrpc.ConnLog(log),
)
return &registrationServerClient{
client: tunnelpogs.RegistrationServer_PogsClient{Client: conn.Bootstrap(ctx), Conn: conn},
transport: transport,
}
}
func (rsc *registrationServerClient) RegisterConnection(
ctx context.Context,
properties *NamedTunnelProperties,
options *tunnelpogs.ConnectionOptions,
connIndex uint8,
observer *Observer,
) (*tunnelpogs.ConnectionDetails, error) {
conn, err := rsc.client.RegisterConnection(
ctx,
properties.Credentials.Auth(),
properties.Credentials.TunnelID,
connIndex,
options,
)
if err != nil {
if err.Error() == DuplicateConnectionError {
observer.metrics.regFail.WithLabelValues("dup_edge_conn", "registerConnection").Inc()
return nil, errDuplicationConnection
}
observer.metrics.regFail.WithLabelValues("server_error", "registerConnection").Inc()
return nil, serverRegistrationErrorFromRPC(err)
}
observer.metrics.regSuccess.WithLabelValues("registerConnection").Inc()
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observer.logServerInfo(connIndex, conn.Location, options.OriginLocalIP, fmt.Sprintf("Connection %s registered", conn.UUID))
observer.sendConnectedEvent(connIndex, conn.Location)
return conn, nil
}
func (rsc *registrationServerClient) SendLocalConfiguration(ctx context.Context, config []byte, observer *Observer) (err error) {
observer.metrics.localConfigMetrics.pushes.Inc()
defer func() {
if err != nil {
observer.metrics.localConfigMetrics.pushesErrors.Inc()
}
}()
return rsc.client.SendLocalConfiguration(ctx, config)
}
func (rsc *registrationServerClient) GracefulShutdown(ctx context.Context, gracePeriod time.Duration) {
ctx, cancel := context.WithTimeout(ctx, gracePeriod)
defer cancel()
_ = rsc.client.UnregisterConnection(ctx)
}
func (rsc *registrationServerClient) Close() {
// Closing the client will also close the connection
_ = rsc.client.Close()
// Closing the transport also closes the stream
_ = rsc.transport.Close()
}
type rpcName string
const (
register rpcName = "register"
reconnect rpcName = "reconnect"
unregister rpcName = "unregister"
authenticate rpcName = " authenticate"
)
func (h *h2muxConnection) registerTunnel(ctx context.Context, credentialSetter CredentialManager, classicTunnel *ClassicTunnelProperties, registrationOptions *tunnelpogs.RegistrationOptions) error {
h.observer.sendRegisteringEvent(registrationOptions.ConnectionID)
stream, err := h.newRPCStream(ctx, register)
if err != nil {
return err
}
rpcClient := NewTunnelServerClient(ctx, stream, h.observer.log)
defer rpcClient.Close()
_ = h.logServerInfo(ctx, rpcClient)
registration := rpcClient.client.RegisterTunnel(
ctx,
classicTunnel.OriginCert,
classicTunnel.Hostname,
registrationOptions,
)
if registrationErr := registration.DeserializeError(); registrationErr != nil {
// RegisterTunnel RPC failure
return h.processRegisterTunnelError(registrationErr, register)
}
credentialSetter.SetEventDigest(h.connIndex, registration.EventDigest)
return h.processRegistrationSuccess(registration, register, credentialSetter, classicTunnel)
}
type CredentialManager interface {
ReconnectToken() ([]byte, error)
EventDigest(connID uint8) ([]byte, error)
SetEventDigest(connID uint8, digest []byte)
ConnDigest(connID uint8) ([]byte, error)
SetConnDigest(connID uint8, digest []byte)
}
func (h *h2muxConnection) processRegistrationSuccess(
registration *tunnelpogs.TunnelRegistration,
name rpcName,
credentialManager CredentialManager, classicTunnel *ClassicTunnelProperties,
) error {
for _, logLine := range registration.LogLines {
h.observer.log.Info().Msg(logLine)
}
if registration.TunnelID != "" {
h.observer.metrics.tunnelsHA.AddTunnelID(h.connIndex, registration.TunnelID)
h.observer.log.Info().Msgf("Each HA connection's tunnel IDs: %v", h.observer.metrics.tunnelsHA.String())
}
credentialManager.SetConnDigest(h.connIndex, registration.ConnDigest)
h.observer.metrics.userHostnamesCounts.WithLabelValues(registration.Url).Inc()
h.observer.log.Info().Msgf("Route propagating, it may take up to 1 minute for your new route to become functional")
h.observer.metrics.regSuccess.WithLabelValues(string(name)).Inc()
return nil
}
func (h *h2muxConnection) processRegisterTunnelError(err tunnelpogs.TunnelRegistrationError, name rpcName) error {
if err.Error() == DuplicateConnectionError {
h.observer.metrics.regFail.WithLabelValues("dup_edge_conn", string(name)).Inc()
return errDuplicationConnection
}
h.observer.metrics.regFail.WithLabelValues("server_error", string(name)).Inc()
return ServerRegisterTunnelError{
Cause: err,
Permanent: err.IsPermanent(),
}
}
func (h *h2muxConnection) reconnectTunnel(ctx context.Context, credentialManager CredentialManager, classicTunnel *ClassicTunnelProperties, registrationOptions *tunnelpogs.RegistrationOptions) error {
token, err := credentialManager.ReconnectToken()
if err != nil {
return err
}
eventDigest, err := credentialManager.EventDigest(h.connIndex)
if err != nil {
return err
}
connDigest, err := credentialManager.ConnDigest(h.connIndex)
if err != nil {
return err
}
h.observer.log.Debug().Msg("initiating RPC stream to reconnect")
stream, err := h.newRPCStream(ctx, register)
if err != nil {
return err
}
rpcClient := NewTunnelServerClient(ctx, stream, h.observer.log)
defer rpcClient.Close()
_ = h.logServerInfo(ctx, rpcClient)
registration := rpcClient.client.ReconnectTunnel(
ctx,
token,
eventDigest,
connDigest,
classicTunnel.Hostname,
registrationOptions,
)
if registrationErr := registration.DeserializeError(); registrationErr != nil {
// ReconnectTunnel RPC failure
return h.processRegisterTunnelError(registrationErr, reconnect)
}
return h.processRegistrationSuccess(registration, reconnect, credentialManager, classicTunnel)
}
func (h *h2muxConnection) logServerInfo(ctx context.Context, rpcClient *tunnelServerClient) error {
// Request server info without blocking tunnel registration; must use capnp library directly.
serverInfoPromise := tunnelrpc.TunnelServer{Client: rpcClient.client.Client}.GetServerInfo(ctx, func(tunnelrpc.TunnelServer_getServerInfo_Params) error {
return nil
})
serverInfoMessage, err := serverInfoPromise.Result().Struct()
if err != nil {
h.observer.log.Err(err).Msg("Failed to retrieve server information")
return err
}
serverInfo, err := tunnelpogs.UnmarshalServerInfo(serverInfoMessage)
if err != nil {
h.observer.log.Err(err).Msg("Failed to retrieve server information")
return err
}
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h.observer.logServerInfo(h.connIndex, serverInfo.LocationName, net.IP{}, "Connection established")
return nil
}
func (h *h2muxConnection) registerNamedTunnel(
ctx context.Context,
namedTunnel *NamedTunnelProperties,
connOptions *tunnelpogs.ConnectionOptions,
) error {
stream, err := h.newRPCStream(ctx, register)
if err != nil {
return err
}
rpcClient := h.newRPCClientFunc(ctx, stream, h.observer.log)
defer rpcClient.Close()
if _, err = rpcClient.RegisterConnection(ctx, namedTunnel, connOptions, h.connIndex, h.observer); err != nil {
return err
}
return nil
}
func (h *h2muxConnection) unregister(isNamedTunnel bool) {
h.observer.sendUnregisteringEvent(h.connIndex)
unregisterCtx, cancel := context.WithTimeout(context.Background(), h.gracePeriod)
defer cancel()
stream, err := h.newRPCStream(unregisterCtx, unregister)
if err != nil {
return
}
defer stream.Close()
if isNamedTunnel {
rpcClient := h.newRPCClientFunc(unregisterCtx, stream, h.observer.log)
defer rpcClient.Close()
rpcClient.GracefulShutdown(unregisterCtx, h.gracePeriod)
} else {
rpcClient := NewTunnelServerClient(unregisterCtx, stream, h.observer.log)
defer rpcClient.Close()
// gracePeriod is encoded in int64 using capnproto
_ = rpcClient.client.UnregisterTunnel(unregisterCtx, h.gracePeriod.Nanoseconds())
}
h.observer.log.Info().Uint8(LogFieldConnIndex, h.connIndex).Msg("Unregistered tunnel connection")
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}