gfwleak/modikai-echodns
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new features added -- bailiwick test, ns chain, cname chain

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MDK
2023-09-09 16:07:39 +08:00
parent 4502a24c38
commit b1c97a13d3
1 changed files with 50 additions and 0 deletions
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50
echodns.go
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@@ -41,6 +41,12 @@ func strategyMaker(name string, qtype uint16) int8 {
return 6 // return response with wrong txid return 6 // return response with wrong txid
} else if strings.Contains(subdomain, "wrong-rec") { } else if strings.Contains(subdomain, "wrong-rec") {
return 7 // return response with wrong records return 7 // return response with wrong records
} else if strings.Contains(subdomain, "bailiwick") {
return 8 // bailiwick verification
} else if strings.Contains(subdomain, "cname-chain") {
return 9 // unlimited ns chain
} else if strings.Contains(subdomain, "ns-chain") {
return 10 // unlimited cname chain
} }
} }
return -1 return -1
@@ -78,6 +84,7 @@ func handleReflect(w dns.ResponseWriter, r *dns.Msg) {
} }
id = m.MsgHdr.Id id = m.MsgHdr.Id
name = m.Question[0].Name name = m.Question[0].Name
subdomain := strings.ToLower(strings.Split(name, ".")[0])
qtype = m.Question[0].Qtype qtype = m.Question[0].Qtype
log.Log().Str("sip", ip.String()).Int64("port", int64(port)).Int64("id", int64(id)).Str("name", name).Int64("qtype", int64(qtype)).Msg("") log.Log().Str("sip", ip.String()).Int64("port", int64(port)).Int64("id", int64(id)).Str("name", name).Int64("qtype", int64(qtype)).Msg("")
//log.Printf("%v|%v|%v|%v|%v", ip, port, id, name, qtype) //log.Printf("%v|%v|%v|%v|%v", ip, port, id, name, qtype)
@@ -140,6 +147,49 @@ func handleReflect(w dns.ResponseWriter, r *dns.Msg) {
AAAA: net.ParseIP("fe80::7526:a2ae:a0b8:946d"), AAAA: net.ParseIP("fe80::7526:a2ae:a0b8:946d"),
} }
m.Answer = append(m.Answer, wrong_answer) m.Answer = append(m.Answer, wrong_answer)
case 8:
wrong_ns := &dns.NS{
Hdr: dns.RR_Header{Name: name, Rrtype: dns.TypeNS, Class: dns.ClassINET, Ttl: 60},
Ns: dns.Fqdn("dns.baidu.com"),
}
wrong_ns_ip := &dns.A{
Hdr: dns.RR_Header{Name: "dns.baidu.com.", Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 60},
A: net.ParseIP("159.75.200.247"),
}
m.Ns = append(m.Ns, wrong_ns)
m.Extra = append(m.Extra, wrong_ns_ip)
case 9:
cname_target := ""
labels := strings.Split(subdomain, "-")
if len(labels) == 2 {
cname_target = subdomain + "-0"
} else {
iter_cnt, _ := strconv.Atoi(labels[len(labels)-1])
iter_cnt += 1
cname_target = strings.Join([]string{labels[0], labels[1], strconv.Itoa(iter_cnt)}, "-")
}
cname_target = dns.Fqdn(cname_target + "." + CONFIG_SLD)
cname_redir := &dns.CNAME{
Hdr: dns.RR_Header{Name: name, Rrtype: dns.TypeCNAME, Class: dns.ClassINET, Ttl: 60},
Target: cname_target,
}
m.Answer = append(m.Answer, cname_redir)
case 10:
ns_target := ""
labels := strings.Split(subdomain, "-")
if len(labels) == 2 {
ns_target = subdomain + "-0"
} else {
iter_cnt, _ := strconv.Atoi(labels[len(labels)-1])
iter_cnt += 1
ns_target = strings.Join([]string{labels[0], labels[1], strconv.Itoa(iter_cnt)}, "-")
}
ns_target = dns.Fqdn(ns_target + "." + CONFIG_SLD)
ns_delegation := &dns.NS{
Hdr: dns.RR_Header{Name: name, Rrtype: dns.TypeNS, Class: dns.ClassINET, Ttl: 60},
Ns: ns_target,
}
m.Ns = append(m.Ns, ns_delegation)
case 0: case 0:
a := &dns.A{ a := &dns.A{
Hdr: dns.RR_Header{Name: name, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 3600}, Hdr: dns.RR_Header{Name: name, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 3600},