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client.go
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client.go
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package main
import (
"bufio"
"bytes"
"encoding/binary"
"fmt"
"log"
"net"
"os"
"strings"
"sync"
"time"
"github.com/jessevdk/go-flags"
)
type options struct {
Server string `short:"s" long:"server" description:"DNS Server" required:"false" default:"8.8.8.8"`
Port int `short:"p" long:"port" description:"query num" required:"false" default:"53"`
Domain string `short:"d" long:"domain" description:"Domain Name" required:"true"`
Type string `short:"t" long:"type" description:"Record Type" required:"false"`
Count int `short:"n" long:"count" description:"query num" required:"false" default:"3"`
Timeout int `long:"timeout" description:"deadline time" required:"false"`
Protocol string `long:"protocol" description:"Record Type" required:"false" default:"udp"`
Thread int `long:"threads" description:"thread num" required:"false" default:"1"`
Version bool `long:"version" description:"show version"`
Debug bool `long:"debug" description:""`
Verbose bool `long:"verbose" description:""`
}
type DNSQuery struct {
ID uint16
QR bool
Opcode uint8
AA bool
TC bool
RD bool
RA bool
Z uint8
ResponseCode uint8
QDCount uint16
ANCount uint16
NSCount uint16
ARCount uint16
Questions []DNSQuestion
}
func intToFloat64(i []int64) sort.Float64Slice {
f := make([]float64, len(i))
for n := range i {
f[n] = float64(i[n])
}
return f
}
func printPercentileN(numbers *sort.Float64Slice, l, n int) float64 {
i := l*n/100 - 1
ns := *numbers
return ns[i]
}
func Run(tmp []int64) {
dr := &DNSResult{}
dr.showResult(tmp)
plugin := mp.NewMackerelPlugin(dr)
plugin.Run()
type DNSQuestion struct {
Domain string
Type uint16
Class uint16
}
func (q DNSQuery) encode() []byte {
q.QDCount = uint16(len(q.Questions))
var buffer bytes.Buffer
binary.Write(&buffer, binary.BigEndian, q.ID)
b2i := func(b bool) int {
if b {
return 1
}
return 0
}
queryParams1 := byte(b2i(q.QR)<<7 | int(q.Opcode)<<3 | b2i(q.AA)<<1 | b2i(q.RD))
queryParams2 := byte(b2i(q.RA)<<7 | int(q.Z)<<4)
binary.Write(&buffer, binary.BigEndian, queryParams1)
binary.Write(&buffer, binary.BigEndian, queryParams2)
binary.Write(&buffer, binary.BigEndian, q.QDCount)
binary.Write(&buffer, binary.BigEndian, q.ANCount)
binary.Write(&buffer, binary.BigEndian, q.NSCount)
binary.Write(&buffer, binary.BigEndian, q.ARCount)
for _, question := range q.Questions {
buffer.Write(question.encode())
}
return buffer.Bytes()
}
func (q DNSQuestion) encode() []byte {
var buffer bytes.Buffer
domainParts := strings.Split(q.Domain, ".")
for _, part := range domainParts {
if err := binary.Write(&buffer, binary.BigEndian, byte(len(part))); err != nil {
log.Fatalf("Error binary.Write(..) for '%s': '%s'", part, err)
}
for _, c := range part {
if err := binary.Write(&buffer, binary.BigEndian, uint8(c)); err != nil {
log.Fatalf("Error binary.Write(..) for '%s'; '%c': '%s'", part, c, err)
}
}
}
binary.Write(&buffer, binary.BigEndian, uint8(0))
binary.Write(&buffer, binary.BigEndian, q.Type)
binary.Write(&buffer, binary.BigEndian, q.Class)
return buffer.Bytes()
}
func Do(conn net.Conn, encodedQuery []byte, cnt int) (res []int64) {
for i := 0; i < cnt; i++ {
start := time.Now()
conn.Write(encodedQuery)
encodedAnswer := make([]byte, len(encodedQuery))
if _, err := bufio.NewReader(conn).Read(encodedAnswer); err != nil {
log.Fatal(err)
}
res = append(res, time.Since(start).Milliseconds())
}
return res
}
func Calc(wg *sync.WaitGroup, c chan<- []int64, conn net.Conn, encodedQuery []byte, cnt int) {
defer wg.Done()
res := Do(conn, encodedQuery, cnt)
c <- res
}
func resultShow(tmp []int64) {
fmt.Println(tmp)
}
func main() {
var opts options
_, err := flags.ParseArgs(&opts, os.Args)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
q := DNSQuestion{
Domain: opts.Domain,
Type: 0x1, // A record
Class: 0x1, // Internet
}
query := DNSQuery{
ID: 0xAAAA,
RD: true,
Questions: []DNSQuestion{q},
}
// Setup a UDP connection
conn, err := net.Dial(opts.Protocol, fmt.Sprintf("%s:%d", opts.Server, opts.Port))
if err != nil {
log.Fatal("failed to connect:", err)
}
defer conn.Close()
if err := conn.SetDeadline(time.Now().Add(15 * time.Second)); err != nil {
log.Fatal("failed to set deadline: ", err)
}
encodedQuery := query.encode()
var wg sync.WaitGroup
c := make(chan []int64, opts.Thread)
for i := 0; i < opts.Thread; i++ {
wg.Add(1)
go Calc(&wg, c, conn, encodedQuery, opts.Count)
}
wg.Wait()
close(c)
tmp := []int64{}
for i := range c {
tmp = append(tmp, i...)
}
resultShow(tmp)
}