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package main
import (
"context"
"flag"
"fmt"
"github.com/cloudflare/dns"
dnstap "github.com/dnstap/golang-dnstap"
"google.golang.org/protobuf/proto"
"io"
"io/ioutil"
"log"
"net"
"os"
"os/exec"
"strings"
"time"
)
var (
kresdArgs = []string{
"-n",
"-q",
}
)
func qnameFromFrame(b []byte) (string, error) {
dt := &dnstap.Dnstap{}
var name string
if err := proto.Unmarshal(b, dt); err != nil {
return name, err
}
var msg_raw []byte
m := dt.Message
if *m.Type == dnstap.Message_CLIENT_QUERY {
msg_raw = m.QueryMessage
} else if *m.Type == dnstap.Message_CLIENT_RESPONSE {
msg_raw = m.ResponseMessage
} else {
return name, fmt.Errorf("incorrect message type: %v", *m.Type)
}
if msg_raw == nil {
return name, fmt.Errorf("no message payload")
}
if err := dns.IsMsg(msg_raw); err != nil {
return name, err
}
var msg dns.Msg
if err := msg.Unpack(msg_raw); 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)
// 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", "dnstap.sock", "dnstap socket")
kresdPath = flag.String("cmd", "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)
}
for range "QR" { // Checking Query and Response is the same ATM
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")
}
|
