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main.go
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main.go
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package main
import (
"bufio"
"bytes"
"errors"
"flag"
"fmt"
"io"
"net"
"os"
"strings"
flowmessage "github.com/netsampler/goflow2/v2/cmd/enricher/pb"
// import various formatters
"github.com/netsampler/goflow2/v2/format"
_ "github.com/netsampler/goflow2/v2/format/binary"
_ "github.com/netsampler/goflow2/v2/format/json"
_ "github.com/netsampler/goflow2/v2/format/text"
// import various transports
"github.com/netsampler/goflow2/v2/transport"
_ "github.com/netsampler/goflow2/v2/transport/file"
_ "github.com/netsampler/goflow2/v2/transport/kafka"
"github.com/oschwald/geoip2-golang"
log "github.com/sirupsen/logrus"
"google.golang.org/protobuf/encoding/protodelim"
)
var (
version = ""
buildinfos = ""
AppVersion = "Enricher " + version + " " + buildinfos
DbAsn = flag.String("db.asn", "", "IP->ASN database")
DbCountry = flag.String("db.country", "", "IP->Country database")
LogLevel = flag.String("loglevel", "info", "Log level")
LogFmt = flag.String("logfmt", "normal", "Log formatter")
SamplingRate = flag.Int("samplingrate", 0, "Set sampling rate (values > 0)")
Format = flag.String("format", "json", fmt.Sprintf("Choose the format (available: %s)", strings.Join(format.GetFormats(), ", ")))
Transport = flag.String("transport", "file", fmt.Sprintf("Choose the transport (available: %s)", strings.Join(transport.GetTransports(), ", ")))
Version = flag.Bool("v", false, "Print version")
)
func MapAsn(db *geoip2.Reader, addr []byte, dest *uint32) {
entry, err := db.ASN(net.IP(addr))
if err != nil {
return
}
*dest = uint32(entry.AutonomousSystemNumber)
}
func MapCountry(db *geoip2.Reader, addr []byte, dest *string) {
entry, err := db.Country(net.IP(addr))
if err != nil {
return
}
*dest = entry.Country.IsoCode
}
func MapFlow(dbAsn, dbCountry *geoip2.Reader, msg *ProtoProducerMessage) {
if dbAsn != nil {
MapAsn(dbAsn, msg.SrcAddr, &(msg.FlowMessageExt.SrcAs))
MapAsn(dbAsn, msg.DstAddr, &(msg.FlowMessageExt.DstAs))
}
if dbCountry != nil {
MapCountry(dbCountry, msg.SrcAddr, &(msg.FlowMessageExt.SrcCountry))
MapCountry(dbCountry, msg.DstAddr, &(msg.FlowMessageExt.DstCountry))
}
}
type ProtoProducerMessage struct {
flowmessage.FlowMessageExt
}
func (m *ProtoProducerMessage) MarshalBinary() ([]byte, error) {
buf := bytes.NewBuffer([]byte{})
_, err := protodelim.MarshalTo(buf, m)
return buf.Bytes(), err
}
func main() {
flag.Parse()
if *Version {
fmt.Println(AppVersion)
os.Exit(0)
}
lvl, _ := log.ParseLevel(*LogLevel)
log.SetLevel(lvl)
var dbAsn, dbCountry *geoip2.Reader
var err error
if *DbAsn != "" {
dbAsn, err = geoip2.Open(*DbAsn)
if err != nil {
log.Fatal(err)
}
defer dbAsn.Close()
}
if *DbCountry != "" {
dbCountry, err = geoip2.Open(*DbCountry)
if err != nil {
log.Fatal(err)
}
defer dbCountry.Close()
}
formatter, err := format.FindFormat(*Format)
if err != nil {
log.Fatal(err)
}
transporter, err := transport.FindTransport(*Transport)
if err != nil {
log.Fatal(err)
}
defer transporter.Close()
switch *LogFmt {
case "json":
log.SetFormatter(&log.JSONFormatter{})
}
log.Info("starting enricher")
rdr := bufio.NewReader(os.Stdin)
var msg ProtoProducerMessage
for {
if err := protodelim.UnmarshalFrom(rdr, &msg); err != nil && errors.Is(err, io.EOF) {
return
} else if err != nil {
log.Error(err)
continue
}
MapFlow(dbAsn, dbCountry, &msg)
if *SamplingRate > 0 {
msg.SamplingRate = uint64(*SamplingRate)
}
key, data, err := formatter.Format(&msg)
if err != nil {
log.Error(err)
continue
}
err = transporter.Send(key, data)
if err != nil {
log.Error(err)
continue
}
msg.Reset()
}
}