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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,143 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "log" | ||
| "net" | ||
| "os" | ||
| "os/signal" | ||
| "strconv" | ||
| "strings" | ||
| "time" | ||
|
|
||
| dnstap "github.com/dnstap/golang-dnstap" | ||
| "github.com/golang/protobuf/proto" | ||
| ) | ||
|
|
||
| var done = make(chan bool) | ||
| var ln net.Listener | ||
|
|
||
| func parseDnstapSocket(socketString, socketChmod string) *dnstap.FrameStreamSockInput { | ||
| connArray := strings.Split(socketString, "://") | ||
| var err error | ||
| ln, err = net.Listen(connArray[0], connArray[1]) | ||
|
|
||
| if err != nil { | ||
| log.Fatalf("%v\n", err) | ||
| } | ||
| log.Printf("listening on DNStap socket %v\n", socketString) | ||
|
|
||
| if strings.Contains(socketString, "unix://") { | ||
| //Chmod is defined in 8 bits not 10 bits, needs to be converter then passed on to the program | ||
| permission, err := strconv.ParseInt(socketChmod, 8, 0) | ||
| if err != nil { | ||
| log.Fatalf("%v\n", err) | ||
| } | ||
| err = os.Chmod(connArray[1], os.FileMode(permission)) | ||
| if err != nil { | ||
| log.Fatalf("%v\n", err) | ||
| } | ||
| } | ||
| return dnstap.NewFrameStreamSockInput(ln) | ||
|
|
||
| } | ||
|
|
||
| func handleDNSTapInterrupt(done chan bool) { | ||
| c := make(chan os.Signal, 1) | ||
| signal.Notify(c, os.Interrupt) | ||
| go func() { | ||
| for range c { | ||
| log.Printf("SIGINT received.. Cleaning up") | ||
| if strings.Contains(*dnstapSocket, "unix://") { | ||
| os.Remove(strings.Split(*dnstapSocket, "://")[1]) | ||
| } else { | ||
| ln.Close() | ||
| } | ||
| close(done) | ||
| return | ||
| } | ||
| }() | ||
| } | ||
|
|
||
| func dnsTapMsgToDNSResult(msg []byte) DNSResult { | ||
| dnstapObject := &dnstap.Dnstap{} | ||
|
|
||
| proto.Unmarshal(msg, dnstapObject) | ||
|
|
||
| // var myDNSrow DNSRow | ||
| var myDNSResult DNSResult | ||
|
|
||
| if dnstapObject.Message.GetQueryMessage() != nil { | ||
| myDNSResult.DNS.Unpack(dnstapObject.Message.GetQueryMessage()) | ||
| } else { | ||
| myDNSResult.DNS.Unpack(dnstapObject.Message.GetResponseMessage()) | ||
| } | ||
|
|
||
| myDNSResult.Timestamp = time.Unix(int64(dnstapObject.Message.GetQueryTimeSec()), int64(dnstapObject.Message.GetQueryTimeNsec())) | ||
| myDNSResult.IPVersion = uint8(*dnstapObject.GetMessage().SocketFamily)*2 + 2 | ||
| myDNSResult.SrcIP = dnstapObject.Message.GetQueryAddress() | ||
| myDNSResult.DstIP = dnstapObject.Message.GetQueryAddress() | ||
| myDNSResult.Protocol = strings.ToLower(dnstapObject.Message.GetSocketProtocol().String()) | ||
| myDNSResult.PacketLength = uint16(len(dnstapObject.Message.GetResponseMessage()) + len(dnstapObject.Message.GetQueryMessage())) | ||
|
|
||
| return myDNSResult | ||
| } | ||
|
|
||
| func startDNSTap(resultChannel chan DNSResult) { | ||
| log.Println("Starting DNStap capture") | ||
| input := parseDnstapSocket(*dnstapSocket, *dnstapPermission) | ||
|
|
||
| buf := make(chan []byte, 1024) | ||
|
|
||
| ratioCnt := 0 | ||
| totalCnt := 0 | ||
|
|
||
| // Set up various tickers for different tasks | ||
| captureStatsTicker := time.Tick(*captureStatsDelay) | ||
| printStatsTicker := time.Tick(*printStatsDelay) | ||
| skipDomainsFileTicker := time.NewTicker(*skipDomainsRefreshInterval) | ||
| skipDomainsFileTickerChan := skipDomainsFileTicker.C | ||
| if *skipDomainsFile == "" { | ||
| skipDomainsFileTicker.Stop() | ||
| } | ||
|
|
||
| // Setup SIGINT handling | ||
| handleDNSTapInterrupt(done) | ||
|
|
||
| for { | ||
|
|
||
| go input.ReadInto(buf) | ||
| select { | ||
| case msg := <-buf: | ||
| ratioCnt++ | ||
| totalCnt++ | ||
|
|
||
| if msg == nil { | ||
| log.Println("dnstap socket is returning nil. exiting..") | ||
| time.Sleep(time.Second * 2) | ||
| close(done) | ||
| return | ||
| } | ||
| if ratioCnt%ratioB < ratioA { | ||
| if ratioCnt > ratioB*ratioA { | ||
| ratioCnt = 0 | ||
| } | ||
| select { | ||
| case resultChannel <- dnsTapMsgToDNSResult(msg): | ||
|
|
||
| case <-done: | ||
| return | ||
| } | ||
| } | ||
| case <-done: | ||
| return | ||
| case <-captureStatsTicker: | ||
| myStats.PacketsGot = totalCnt | ||
| myStats.PacketsLost = 0 | ||
| myStats.PacketLossPercent = (float32(myStats.PacketsLost) * 100.0 / float32(myStats.PacketsGot)) | ||
| case <-printStatsTicker: | ||
| log.Printf("%+v\n", myStats) | ||
| case <-skipDomainsFileTickerChan: | ||
| SkipDomainList = loadSkipDomains() | ||
| } | ||
| } | ||
| } |
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