/
publish.go
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/
publish.go
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// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you 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 publish
import (
"net"
"github.com/pkg/errors"
"github.com/elastic/beats/v7/libbeat/beat"
"github.com/elastic/beats/v7/libbeat/common"
"github.com/elastic/beats/v7/libbeat/logp"
"github.com/elastic/beats/v7/libbeat/processors"
"github.com/elastic/beats/v7/packetbeat/pb"
)
type TransactionPublisher struct {
done chan struct{}
pipeline beat.Pipeline
canDrop bool
processor transProcessor
}
type transProcessor struct {
ignoreOutgoing bool
localIPs []net.IP // TODO: Periodically update this list.
internalNetworks []string
name string
}
var debugf = logp.MakeDebug("publish")
func NewTransactionPublisher(
name string,
pipeline beat.Pipeline,
ignoreOutgoing bool,
canDrop bool,
internalNetworks []string,
) (*TransactionPublisher, error) {
addrs, err := common.LocalIPAddrs()
if err != nil {
return nil, err
}
var localIPs []net.IP
for _, addr := range addrs {
if !addr.IsLoopback() {
localIPs = append(localIPs, addr)
}
}
p := &TransactionPublisher{
done: make(chan struct{}),
pipeline: pipeline,
canDrop: canDrop,
processor: transProcessor{
localIPs: localIPs,
internalNetworks: internalNetworks,
name: name,
ignoreOutgoing: ignoreOutgoing,
},
}
return p, nil
}
func (p *TransactionPublisher) Stop() {
close(p.done)
}
func (p *TransactionPublisher) CreateReporter(
config *common.Config,
) (func(beat.Event), error) {
// load and register the module it's fields, tags and processors settings
meta := struct {
Index string `config:"index"`
Event common.EventMetadata `config:",inline"`
Processors processors.PluginConfig `config:"processors"`
KeepNull bool `config:"keep_null"`
}{}
if err := config.Unpack(&meta); err != nil {
return nil, err
}
processors, err := processors.New(meta.Processors)
if err != nil {
return nil, err
}
clientConfig := beat.ClientConfig{
Processing: beat.ProcessingConfig{
EventMetadata: meta.Event,
Processor: processors,
KeepNull: meta.KeepNull,
},
}
if p.canDrop {
clientConfig.PublishMode = beat.DropIfFull
}
if meta.Index != "" {
clientConfig.Processing.Meta = common.MapStr{"raw_index": meta.Index}
}
client, err := p.pipeline.ConnectWith(clientConfig)
if err != nil {
return nil, err
}
// start worker, so post-processing and processor-pipeline
// can work concurrently to sniffer acquiring new events
ch := make(chan beat.Event, 3)
go p.worker(ch, client)
return func(event beat.Event) {
select {
case ch <- event:
case <-p.done:
ch = nil // stop serving more send requests
}
}, nil
}
func (p *TransactionPublisher) worker(ch chan beat.Event, client beat.Client) {
for {
select {
case <-p.done:
return
case event := <-ch:
pub, _ := p.processor.Run(&event)
if pub != nil {
client.Publish(*pub)
}
}
}
}
func (p *transProcessor) Run(event *beat.Event) (*beat.Event, error) {
if err := validateEvent(event); err != nil {
logp.Warn("Dropping invalid event: %v", err)
return nil, nil
}
fields, err := MarshalPacketbeatFields(event, p.localIPs, p.internalNetworks)
if err != nil {
return nil, err
}
if fields != nil {
if p.ignoreOutgoing && fields.Network.Direction == pb.Egress {
debugf("Ignore outbound transaction on: %s -> %s",
fields.Source.IP, fields.Destination.IP)
return nil, nil
}
}
return event, nil
}
// filterEvent validates an event for common required fields with types.
// If event is to be filtered out the reason is returned as error.
func validateEvent(event *beat.Event) error {
fields := event.Fields
if event.Timestamp.IsZero() {
return errors.New("missing '@timestamp'")
}
_, ok := fields["@timestamp"]
if ok {
return errors.New("duplicate '@timestamp' field from event")
}
t, ok := fields["type"]
if !ok {
return errors.New("missing 'type' field from event")
}
_, ok = t.(string)
if !ok {
return errors.New("invalid 'type' field from event")
}
return nil
}
// MarshalPacketbeatFields marshals data contained in the _packetbeat field
// into the event and removes the _packetbeat key.
func MarshalPacketbeatFields(event *beat.Event, localIPs []net.IP, internalNetworks []string) (*pb.Fields, error) {
defer delete(event.Fields, pb.FieldsKey)
fields, err := pb.GetFields(event.Fields)
if err != nil || fields == nil {
return nil, err
}
if err = fields.ComputeValues(localIPs, internalNetworks); err != nil {
return nil, err
}
if err = fields.MarshalMapStr(event.Fields); err != nil {
return nil, err
}
return fields, nil
}