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package processing
// DCSO FEVER
// Copyright (c) 2020, DCSO GmbH
import (
"fmt"
"sync"
"time"
"github.com/DCSO/fever/types"
"github.com/DCSO/fever/util"
log "github.com/sirupsen/logrus"
)
// ProtoProfile contains flow statistics for a give app layer protocol.
type ProtoProfile struct {
PacketsToSrv uint64
PacketsToClt uint64
BytesToSrv uint64
BytesToClt uint64
}
// FlowProfiler counts EVE event type statistics, such as number and size
// of JSON data received from the input.
type FlowProfiler struct {
SensorID string
Host string
Profile map[string]ProtoProfile
FlushPeriod time.Duration
ProfileMutex sync.Mutex
CloseChan chan bool
ClosedChan chan bool
Logger *log.Entry
Submitter util.StatsSubmitter
SubmitChannel chan []byte
SubmitChannelFull bool
}
// MakeFlowProfiler creates a new FlowProfiler.
func MakeFlowProfiler(flushPeriod time.Duration, submitter util.StatsSubmitter) (*FlowProfiler, error) {
a := &FlowProfiler{
FlushPeriod: flushPeriod,
Logger: log.WithFields(log.Fields{
"domain": "flowprofiler",
}),
Profile: make(map[string]ProtoProfile),
CloseChan: make(chan bool),
ClosedChan: make(chan bool),
SubmitChannel: make(chan []byte, 60),
Submitter: submitter,
}
a.Host = getFQDN()
return a, nil
}
func (a *FlowProfiler) formatLineProtocol() []string {
out := make([]string, 0)
a.ProfileMutex.Lock()
myProfile := a.Profile
for proto, protoVals := range myProfile {
out = append(out, fmt.Sprintf("%s,host=%s,proto=%s flowbytestoclient=%d,flowbytestoserver=%d,flowpktstoclient=%d,flowpktstoserver=%d %d",
util.ToolName, a.Host, proto,
protoVals.BytesToClt, protoVals.BytesToSrv,
protoVals.PacketsToClt, protoVals.PacketsToSrv,
uint64(time.Now().UnixNano())))
a.Profile[proto] = ProtoProfile{}
}
a.ProfileMutex.Unlock()
return out
}
func (a *FlowProfiler) flush() {
lineStrings := a.formatLineProtocol()
for _, lineString := range lineStrings {
select {
case a.SubmitChannel <- []byte(lineString):
if a.SubmitChannelFull {
log.Warning("channel was free to submit again")
a.SubmitChannelFull = false
}
default:
if !a.SubmitChannelFull {
log.Warning("channel is full, cannot submit message...")
a.SubmitChannelFull = true
}
}
}
}
// Consume processes an Entry, adding the data within to the internal
// aggregated state
func (a *FlowProfiler) Consume(e *types.Entry) error {
aproto := e.AppProto
if aproto == "" {
aproto = "unknown"
}
a.ProfileMutex.Lock()
profile := a.Profile[aproto]
profile.BytesToClt += uint64(e.BytesToClient)
profile.BytesToSrv += uint64(e.BytesToServer)
profile.PacketsToClt += uint64(e.PktsToClient)
profile.PacketsToSrv += uint64(e.PktsToServer)
a.Profile[aproto] = profile
a.ProfileMutex.Unlock()
return nil
}
// Run starts the background aggregation service for this handler
func (a *FlowProfiler) Run() {
go func() {
for message := range a.SubmitChannel {
a.Submitter.SubmitWithHeaders(message, "", "text/plain", map[string]string{
"database": "telegraf",
"retention_policy": "default",
})
}
}()
go func() {
i := 0 * time.Second
for {
select {
case <-a.CloseChan:
close(a.SubmitChannel)
close(a.ClosedChan)
return
default:
if i >= a.FlushPeriod {
a.flush()
i = 0 * time.Second
}
time.Sleep(1 * time.Second)
i += 1 * time.Second
}
}
}()
}
// Stop causes the aggregator to cease aggregating and submitting data
func (a *FlowProfiler) Stop(stopChan chan bool) {
close(a.CloseChan)
<-a.ClosedChan
close(stopChan)
}
// GetName returns the name of the handler
func (a *FlowProfiler) GetName() string {
return "Flow profiler"
}
// GetEventTypes returns a slice of event type strings that this handler
// should be applied to
func (a *FlowProfiler) GetEventTypes() []string {
return []string{"flow"}
}
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