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telemetry.go
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telemetry.go
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// Copyright 2017 Capsule8, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package sensor
import (
"crypto/tls"
"crypto/x509"
"errors"
"fmt"
"io/ioutil"
"net"
"os"
"strings"
api "github.com/capsule8/capsule8/api/v0"
"github.com/capsule8/capsule8/pkg/config"
"github.com/golang/glog"
"golang.org/x/sys/unix"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
)
// TelemetryService is a service that can be used with the ServiceManager to
// process telemetry subscription requests and stream the resulting telemetry
// events.
type TelemetryService struct {
server *grpc.Server
sensor *Sensor
address string
}
// NewTelemetryService creates a new TelemetryService instance that can be used
// with a ServiceManager instance.
func NewTelemetryService(sensor *Sensor, address string) *TelemetryService {
return &TelemetryService{
address: address,
sensor: sensor,
}
}
// Name returns the human-readable name of the TelemetryService.
func (ts *TelemetryService) Name() string {
return "gRPC Telemetry Server"
}
// Serve is the main entrypoint for the TelemetryService. It is normally called
// by the ServiceManager. It will service requests indefinitely from the calling
// Goroutine.
func (ts *TelemetryService) Serve() error {
var (
err error
lis net.Listener
)
glog.V(1).Info("Serving gRPC API on ", ts.address)
parts := strings.Split(ts.address, ":")
if len(parts) > 1 && parts[0] == "unix" {
socketPath := parts[1]
// Check whether socket already exists and if someone
// is already listening on it.
_, err = os.Stat(socketPath)
if err == nil {
var ua *net.UnixAddr
ua, err = net.ResolveUnixAddr("unix", socketPath)
if err == nil {
var c *net.UnixConn
c, err = net.DialUnix("unix", nil, ua)
if err == nil {
// There is another running service.
// Try to listen below and return the
// error.
c.Close()
} else {
// Remove the stale socket so the
// listen below will succeed.
os.Remove(socketPath)
}
}
}
oldMask := unix.Umask(0077)
lis, err = net.Listen("unix", socketPath)
unix.Umask(oldMask)
} else {
lis, err = net.Listen("tcp", ts.address)
}
if err != nil {
return err
}
defer lis.Close()
// Start local gRPC service on listener
if config.Sensor.UseTLS {
glog.V(1).Infoln("Starting telemetry server with TLS credentials")
certificate, err := tls.LoadX509KeyPair(config.Sensor.TLSServerCertPath, config.Sensor.TLSServerKeyPath)
if err != nil {
return fmt.Errorf("could not load server key pair: %s", err)
}
certPool := x509.NewCertPool()
ca, err := ioutil.ReadFile(config.Sensor.TLSCACertPath)
if err != nil {
return fmt.Errorf("could not read ca certificate: %s", err)
}
if ok := certPool.AppendCertsFromPEM(ca); !ok {
return errors.New("failed to append certs")
}
creds := credentials.NewTLS(&tls.Config{
ClientAuth: tls.RequireAndVerifyClientCert,
Certificates: []tls.Certificate{certificate},
ClientCAs: certPool,
})
ts.server = grpc.NewServer(grpc.Creds(creds))
} else {
glog.V(1).Infoln("Starting telemetry server")
ts.server = grpc.NewServer()
}
t := &telemetryServiceServer{
sensor: ts.sensor,
}
api.RegisterTelemetryServiceServer(ts.server, t)
return ts.server.Serve(lis)
}
// Stop will stop a running TelemetryService.
func (ts *TelemetryService) Stop() {
ts.server.GracefulStop()
}
type telemetryServiceServer struct {
sensor *Sensor
}
func (t *telemetryServiceServer) GetEvents(req *api.GetEventsRequest, stream api.TelemetryService_GetEventsServer) error {
sub := req.Subscription
glog.V(1).Infof("GetEvents(%+v)", sub)
eventStream, err := t.sensor.NewSubscription(sub)
if err != nil {
glog.Errorf("Failed to get events for subscription %+v: %s",
sub, err.Error())
return err
}
go func() {
<-stream.Context().Done()
glog.V(1).Infof("Client disconnected, closing stream")
eventStream.Close()
}()
sendLoop:
for {
ev, ok := <-eventStream.Data
if !ok {
break sendLoop
}
// Send back events right away
te := &api.TelemetryEvent{
Event: ev.(*api.Event),
}
err = stream.Send(&api.GetEventsResponse{
Events: []*api.TelemetryEvent{
te,
},
})
if err != nil {
break sendLoop
}
}
return nil
}