gfwleak/modikai-echodns
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wrong-id, wrong-rec, NXDOMAIN support added

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This commit is contained in:
MDK
2023-08-31 11:32:09 +08:00
parent 62e1391f97
commit 4502a24c38
1 changed files with 43 additions and 11 deletions
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54
echodns.go
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@@ -3,11 +3,11 @@ package main
import (
"flag"
"fmt"
"math/rand"
_ "math/rand"
"net"
"strconv"
"strings"
"time"
_ "time"
"github.com/miekg/dns"
"github.com/rs/zerolog"
@@ -15,11 +15,19 @@ import (
)
var CONFIG_SLD string
var UniqueCounter uint32 = 0xfffffffa
func strategyMaker(name string, qtype uint16) int8 {
var subdomain string
labels := strings.Split(name, ".")
if len(labels) >= 4 {
subdomain = strings.ToLower(labels[len(labels)-4])
}
func strategyMaker(name string, qtype uint16) uint16 {
subdomain := strings.ToLower(strings.Split(name, ".")[0])
if qtype == dns.TypeA {
if strings.Contains(subdomain, "fwd") {
if len(labels) == 4 && (subdomain == "ns1" || subdomain == "ns2") {
return 0
} else if strings.Contains(subdomain, "fwd") {
return 1 // return rdns ip in cname
} else if strings.Contains(subdomain, "rdns") {
return 2 // return honey cname record
@@ -29,9 +37,13 @@ func strategyMaker(name string, qtype uint16) uint16 {
return 4 // basic echodns
} else if strings.Contains(subdomain, "ttl") {
return 5 // ttl test
} else if strings.Contains(subdomain, "wrong-id") {
return 6 // return response with wrong txid
} else if strings.Contains(subdomain, "wrong-rec") {
return 7 // return response with wrong records
}
}
return 0
return -1
}
func InttoIPv4(n uint32) net.IP {
@@ -91,10 +103,11 @@ func handleReflect(w dns.ResponseWriter, r *dns.Msg) {
//fmt.Println(cname_fqdn)
m.Answer = append(m.Answer, cname)
case 3:
time_str := strconv.FormatInt(time.Now().UnixMicro(), 10)
time_int, _ := strconv.Atoi(time_str[5 : len(time_str)-2])
time_int += rand.Intn(10000)
timestamp := InttoIPv4(uint32(time_int))
//time_str := strconv.FormatInt(time.Now().UnixMicro(), 10)
//time_int, _ := strconv.Atoi(time_str[5 : len(time_str)-2])
//time_int += rand.Intn(10000)
UniqueCounter += 1
timestamp := InttoIPv4(uint32(UniqueCounter))
a := &dns.A{
Hdr: dns.RR_Header{Name: name, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 14400},
A: timestamp,
@@ -114,8 +127,27 @@ func handleReflect(w dns.ResponseWriter, r *dns.Msg) {
A: ip,
}
m.Answer = append(m.Answer, a)
case 6:
m.MsgHdr.Id += 1
a := &dns.A{
Hdr: dns.RR_Header{Name: name, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 60},
A: ip,
}
m.Answer = append(m.Answer, a)
case 7:
wrong_answer := &dns.AAAA{
Hdr: dns.RR_Header{Name: "www.example.com.", Rrtype: dns.TypeAAAA, Class: dns.ClassINET, Ttl: 60},
AAAA: net.ParseIP("fe80::7526:a2ae:a0b8:946d"),
}
m.Answer = append(m.Answer, wrong_answer)
case 0:
return
a := &dns.A{
Hdr: dns.RR_Header{Name: name, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 3600},
A: net.ParseIP("159.75.200.247"),
}
m.Answer = append(m.Answer, a)
case -1:
m.MsgHdr.Rcode = dns.RcodeNameError
}
w.WriteMsg(m)
}