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package main
import (
"bufio"
"encoding/binary"
"encoding/json"
"fmt"
"io"
_ "net"
"os"
"strconv"
"strings"
"sync"
"time"
"flag"
"github.com/miekg/dns"
)
type Data struct {
target string
dict map[int]map[string]bool
}
var dataset map[string]map[int][]string
var input_file string
var save_file string
var id_stamp string
func send_query(addr string, dn string) (*dns.Msg, error) {
var domain string
if dn == "timestamp" {
timestamp := strconv.FormatInt(time.Now().UnixMilli(), 10)
domain = strings.Join([]string{timestamp, "-scan.echodns.xyz."}, "")
} else {
domain = strings.Join([]string{dn, ".echodns.xyz."}, "")
}
//fmt.Println(domain)
m := new(dns.Msg)
m.SetQuestion(domain, dns.TypeA)
m.RecursionDesired = true
res, err := dns.Exchange(m, addr)
return res, err
}
func retrieve_ip(pool chan string, file_name string) {
cnt := 0
f, err := os.Open(file_name)
if err != nil {
fmt.Println("cannot open file")
return
}
defer f.Close()
fmt.Println("sending msg ...")
reader := bufio.NewReader(f)
for {
s, err := reader.ReadString('\n')
if err == io.EOF {
break
}
s = s[:(len(s) - 1)] //remove \n in linux | remove \r\n in windows
//fmt.Println(s)
pool <- s
cnt++
if cnt%1000 == 0 {
fmt.Println(cnt)
}
}
close(pool)
}
func store_data(pool chan Data, wg *sync.WaitGroup) {
wg.Add(1)
for {
temp := make(map[int][]string)
if data, ok := <-pool; ok {
if len(data.dict) > 0 {
for tp := range data.dict {
for rdns := range data.dict[tp] {
temp[tp] = append(temp[tp], rdns)
}
}
dataset[data.target] = temp
}
} else {
break
}
}
wg.Done()
}
func create_threads(n int, ip_pool chan string, data_pool chan Data, wg1 *sync.WaitGroup) {
for i := 0; i < n; i++ {
wg1.Add(1)
go dns_query(ip_pool, data_pool, wg1)
}
}
func active_probe(n int, addr string) Data {
var (
rdns_ip string
tp int
)
target_ip := addr[:len(addr)-3]
data := Data{target_ip, make(map[int]map[string]bool)}
stop := 0
for i := 0; i < n; i++ {
//fmt.Println(target_ip)
subdomain := strings.Join([]string{strings.Replace(target_ip, ".", "-", -1), "fwd", strconv.Itoa(i), "240209"}, "-")
res, err := send_query(addr, subdomain)
//fmt.Println(err)
if err == nil {
if len(res.Answer) == 3 {
if cname, ok := res.Answer[0].(*dns.CNAME); ok {
rdns_ip = strings.Join(strings.Split(strings.Split(cname.Target, ".")[0], "-")[1:], ".")
if a, ok := res.Answer[2].(*dns.A); ok {
tp = int(binary.BigEndian.Uint32(a.A))
//fmt.Println(rdns_ip)
//fmt.Println(tp)
if data.dict[tp] == nil {
data.dict[tp] = make(map[string]bool)
}
data.dict[tp][rdns_ip] = true
stop = 0
} else {
stop += 1
}
} else {
stop += 1
}
} else {
stop += 1
}
} else {
stop += 1
//fmt.Println(err)
}
if stop == 3 {
return data
}
}
return data
}
func dns_query(pool chan string, data_pool chan Data, wg *sync.WaitGroup) {
for {
if s, ok := <-pool; ok {
addr := s + ":53"
//fmt.Println(addr)
data := active_probe(20, addr)
if data.dict != nil {
data_pool <- data
}
} else {
break
}
}
wg.Done()
}
func save_to_file(filename string) {
jsonstr, _ := json.Marshal(dataset)
save_file, _ := os.Create(filename)
if _, err := save_file.Write(jsonstr); err != nil {
panic(err)
}
save_file.Close()
}
func main() {
ip_pool := make(chan string, 1000)
data_pool := make(chan Data, 400)
var probe_tasks sync.WaitGroup
var store_task sync.WaitGroup
dataset = make(map[string]map[int][]string)
//save_file := "output/global-cache-240209.json"
flag.StringVar(&input_file, "input", "", "input file")
flag.StringVar(&save_file, "output", "", "output file")
flag.StringVar(&id_stamp, "salt", "", "salt in domain")
flag.Parse()
if input_file == "" || save_file == "" || id_stamp == "" {
panic("Please configure the task!\n")
}
fmt.Println(time.Now())
go retrieve_ip(ip_pool, input_file)
create_threads(500, ip_pool, data_pool, &probe_tasks)
go store_data(data_pool, &store_task)
probe_tasks.Wait()
close(data_pool)
store_task.Wait()
save_to_file(save_file)
fmt.Println("All done!")
fmt.Println(time.Now())
}
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