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 ( import (
"flag" "flag"
"fmt" "fmt"
"math/rand" _ "math/rand"
"net" "net"
"strconv" "strconv"
"strings" "strings"
"time" _ "time"
"github.com/miekg/dns" "github.com/miekg/dns"
"github.com/rs/zerolog" "github.com/rs/zerolog"
@@ -15,11 +15,19 @@ import (
) )
var CONFIG_SLD string 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 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 return 1 // return rdns ip in cname
} else if strings.Contains(subdomain, "rdns") { } else if strings.Contains(subdomain, "rdns") {
return 2 // return honey cname record return 2 // return honey cname record
@@ -29,9 +37,13 @@ func strategyMaker(name string, qtype uint16) uint16 {
return 4 // basic echodns return 4 // basic echodns
} else if strings.Contains(subdomain, "ttl") { } else if strings.Contains(subdomain, "ttl") {
return 5 // ttl test 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 { func InttoIPv4(n uint32) net.IP {
@@ -91,10 +103,11 @@ func handleReflect(w dns.ResponseWriter, r *dns.Msg) {
//fmt.Println(cname_fqdn) //fmt.Println(cname_fqdn)
m.Answer = append(m.Answer, cname) m.Answer = append(m.Answer, cname)
case 3: case 3:
time_str := strconv.FormatInt(time.Now().UnixMicro(), 10) //time_str := strconv.FormatInt(time.Now().UnixMicro(), 10)
time_int, _ := strconv.Atoi(time_str[5 : len(time_str)-2]) //time_int, _ := strconv.Atoi(time_str[5 : len(time_str)-2])
time_int += rand.Intn(10000) //time_int += rand.Intn(10000)
timestamp := InttoIPv4(uint32(time_int)) UniqueCounter += 1
timestamp := InttoIPv4(uint32(UniqueCounter))
a := &dns.A{ a := &dns.A{
Hdr: dns.RR_Header{Name: name, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 14400}, Hdr: dns.RR_Header{Name: name, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 14400},
A: timestamp, A: timestamp,
@@ -114,8 +127,27 @@ func handleReflect(w dns.ResponseWriter, r *dns.Msg) {
A: ip, A: ip,
} }
m.Answer = append(m.Answer, a) 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: 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) w.WriteMsg(m)
} }