1 files changed, 245 insertions, 0 deletions
diff --git a/tests/dnstap/src/dnstap-test/main.go b/tests/dnstap/src/dnstap-test/main.go
new file mode 100644
index 0000000..6ef3e1e
--- /dev/null
+++ b/tests/dnstap/src/dnstap-test/main.go
@@ -0,0 +1,245 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"github.com/cloudflare/dns"
+	dnstap "github.com/dnstap/golang-dnstap"
+	"github.com/golang/protobuf/proto"
+	"io"
+	"io/ioutil"
+	"log"
+	"net"
+	"os"
+	"os/exec"
+	"strings"
+	"time"
+)
+
+const (
+	kresdWorkDir = "/tmp/"
+)
+
+var (
+	kresdArgs = []string{
+		"-f1",
+		"-v",
+		"-q",
+	}
+)
+
+func qnameFromFrame(b []byte) (string, error) {
+	dt := &dnstap.Dnstap{}
+	var name string
+	if err := proto.Unmarshal(b, dt); err != nil {
+		return name, err
+	}
+	m := dt.Message
+	if *m.Type != dnstap.Message_RESOLVER_RESPONSE {
+		return name, fmt.Errorf("incorrect message type")
+	}
+	if m.ResponseMessage == nil {
+		return name, fmt.Errorf("no message payload")
+	}
+	if err := dns.IsMsg(m.ResponseMessage); err != nil {
+		return name, err
+	}
+	var msg dns.Msg
+	if err := msg.Unpack(m.ResponseMessage); err != nil {
+		return name, err
+	}
+	if len(msg.Question) < 1 {
+		return name, fmt.Errorf("question empty")
+	}
+	return msg.Question[0].Name, nil
+}
+
+func listenOn() (net.Addr, *os.File, error) {
+	udpConn, err := net.ListenUDP("udp", &net.UDPAddr{
+		IP:   net.ParseIP("127.0.0.1"),
+		Port: 0,
+	})
+	if err != nil {
+		return nil, nil, err
+	}
+
+	file, err := udpConn.File()
+	if err != nil {
+		return nil, nil, err
+	}
+	return udpConn.LocalAddr(), file, nil
+}
+
+func runKresd(ctx context.Context, path, configFile string, grace time.Duration) (chan bool, error) {
+	ch := make(chan bool)
+	kresdArgs = append(kresdArgs, "-c"+configFile)
+	kresdArgs = append(kresdArgs, kresdWorkDir)
+	// we have 1 object in ExtraFiles with index 0
+	// child fd will be 3 + i = 3
+	kresdArgs = append(kresdArgs, "-S3")
+
+	file := ctx.Value("file").(*os.File)
+	debug := ctx.Value("debug").(bool)
+
+	cmd := exec.CommandContext(ctx, path, kresdArgs...)
+	cmd.ExtraFiles = []*os.File{file}
+
+	var stdout, stderr io.ReadCloser
+	var err error
+	if debug {
+		stdout, err = cmd.StdoutPipe()
+		if err != nil {
+			log.Printf("stdoutpipe: %v\n", err)
+			return ch, err
+		}
+
+		stderr, err = cmd.StderrPipe()
+		if err != nil {
+			log.Printf("stderrpipe: %v\n", err)
+			return ch, err
+		}
+	}
+
+	go func() {
+		status := false
+		defer func() {
+			ch <- status // kresd done
+		}()
+		if err := cmd.Start(); err != nil {
+			log.Printf("start: %v\n", err)
+			return
+		}
+		time.Sleep(grace)
+		ch <- true // Started kresd
+
+		if debug {
+			s, err := ioutil.ReadAll(stdout)
+			if err != nil {
+				log.Printf("readall: %v\n", err)
+				return
+			}
+			if len(s) > 0 {
+				fmt.Printf("stdout:\n%s\n", s)
+			}
+
+			s, err = ioutil.ReadAll(stderr)
+			if err != nil {
+				log.Printf("readall: %v\n", err)
+				return
+			}
+			if len(s) > 0 {
+				fmt.Printf("stderr:\n%s\n", s)
+			}
+		}
+
+		if err := cmd.Wait(); err != nil && err.Error() != "signal: killed" {
+			log.Printf("wait: %v\n", err)
+			return
+		}
+		status = true
+	}()
+	return ch, nil
+}
+
+func main() {
+	var (
+		unixSocket = flag.String("u", "/tmp/dnstap.sock", "dnstap socket")
+		kresdPath  = flag.String("cmd", "daemon/kresd", "kresd path")
+		configFile = flag.String("c", "config", "config file")
+		qnames     = flag.String("q", ".", "list of comma separated zones")
+		grace      = flag.String("g", "1s", "Time to wait for daemon start")
+		timeout    = flag.String("t", "60s", "Test Timeout")
+		debug      = flag.Bool("d", false, "Debug")
+	)
+
+	flag.Parse()
+
+	kresdStartGracePeriod, err := time.ParseDuration(*grace)
+	if err != nil {
+		panic(err)
+	}
+
+	testTimeout, err := time.ParseDuration(*timeout)
+	if err != nil {
+		panic(err)
+	}
+
+	input, err := dnstap.NewFrameStreamSockInputFromPath(*unixSocket)
+	if err != nil {
+		panic(err)
+	}
+
+	output := make(chan []byte)
+	go input.ReadInto(output)
+
+	ctx, cancel := context.WithTimeout(context.Background(), testTimeout)
+
+	// Create a UDP listening socket on random port
+	// FD will be passed on to kresd
+	addr, file, err := listenOn()
+	if err != nil {
+		panic(err)
+	}
+	if *debug {
+		log.Printf("listen addr:%v", addr)
+	}
+	ctx = context.WithValue(ctx, "file", file)
+	ctx = context.WithValue(ctx, "debug", *debug)
+
+	ch, err := runKresd(ctx, *kresdPath, *configFile, kresdStartGracePeriod)
+	if err != nil {
+		panic(err)
+	}
+
+	log.Printf("Waiting for kresd to start\n")
+	status := <-ch
+	if !status {
+		os.Exit(1) // error starting
+	}
+
+	go func() {
+		parts := strings.Split(*qnames, ",")
+
+		if len(parts) == 0 {
+			log.Printf("qname count is 0")
+		}
+		for _, name := range parts {
+			m := new(dns.Msg)
+			fqdn := dns.Fqdn(name)
+			m.SetQuestion(fqdn, dns.TypeA)
+			c := new(dns.Client)
+			resp, _, err := c.Exchange(m, fmt.Sprintf("%v", addr))
+			if err != nil {
+				log.Printf("%v\n", err)
+				os.Exit(1) // Test Failed
+			}
+			if *debug {
+				log.Printf("Response: %v", resp)
+			}
+
+			// Check dnstap output
+			o := <-output
+			if *debug {
+				log.Printf("raw dnstap:%v", o)
+			}
+			dtName, err := qnameFromFrame(o)
+			if err != nil {
+				log.Printf("%v\n", err)
+				os.Exit(1)
+			}
+			if fqdn != dtName {
+				log.Printf("expected %v got %v", fqdn, dtName)
+				os.Exit(1) // Test failed
+			}
+			log.Printf("matched qname: %v", dtName)
+		}
+		cancel() // Send signal to close daemon
+	}()
+
+	status = <-ch
+	if !status {
+		os.Exit(1) // error in wait
+	}
+	log.Printf("Tested OK\n")
+}