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package atk
import (
"context"
"github.com/miekg/dns"
"net"
"ohmydns2/plugin/pkg/request"
"strings"
)
type Atk struct {
serveType string
czone string
zzone string
cAddr string
zAddr string
}
func (a Atk) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
state := request.Request{W: w, Req: r}
// 转发器模式
if a.serveType == "fdns" {
return 0, nil
} else {
//权威模式
msg := new(dns.Msg)
msg.SetReply(r)
msg.Authoritative = true
if a.serveType == "qdns" {
msg = a.Response(msg, state)
}
err := w.WriteMsg(msg)
if err != nil {
log.Info(err.Error())
return dns.RcodeServerFailure, err
}
return 0, nil
}
}
var (
cflag = 0
zflag = 0
ctarget = ""
ztarget = ""
ctAddr = ""
ztAddr = ""
)
func (a Atk) Name() string {
return "atk"
}
func (a Atk) Response(msg *dns.Msg, state request.Request) *dns.Msg {
// 篡改
if strings.Contains(state.QName(), a.czone) {
// 更改信号到来
if state.QName() != a.czone && strings.Contains(state.QName(), "-") {
ctarget = state.IP()
addrstr := strings.Split(state.QName(), ".")[0]
addrlist := strings.Split(addrstr, "-")
if len(addrlist[0]) == 4 {
ctAddr = strings.ReplaceAll(addrstr, "-", ":")
} else {
ctAddr = strings.ReplaceAll(addrstr, "-", ".")
}
cflag = 1
return msg
}
// 源IP一致，返回一次篡改包
if state.IP() == ctarget && cflag == 1 {
// 恢复原有状态
cflag = 0
//构建响应包
//msg = new(dns.Msg)
//msg.SetReply(state.Req)
//msg.Authoritative = true
rep := new(dns.AAAA)
rep.Hdr = dns.RR_Header{Class: dns.ClassINET, Ttl: 10, Rrtype: dns.TypeAAAA, Name: state.QName()}
rep.AAAA = net.ParseIP(ctAddr)
msg.Answer = append(msg.Answer, rep)
//授权记录
rec := new(dns.NS)
rec.Hdr = dns.RR_Header{Name: state.QName(), Class: dns.ClassINET, Ttl: 10, Rrtype: dns.TypeNS}
rec.Ns = "ns6atk.n64.top."
msg.Ns = append(msg.Ns, rec)
//胶水记录
recaddr := new(dns.AAAA)
recaddr.Hdr = dns.RR_Header{Name: "ns6atk.n64.top.", Class: dns.ClassINET, Ttl: 10, Rrtype: dns.TypeAAAA}
recaddr.AAAA = net.ParseIP(a.cAddr)
msg.Extra = append(msg.Extra, recaddr)
return msg
} else {
// 返回正常包
//构建响应包
//msg = new(dns.Msg)
//msg.SetReply(state.Req)
//msg.Authoritative = true
rep := new(dns.AAAA)
rep.Hdr = dns.RR_Header{Class: dns.ClassINET, Ttl: 10, Rrtype: dns.TypeAAAA, Name: state.QName()}
rep.AAAA = net.ParseIP(a.cAddr)
msg.Answer = append(msg.Answer, rep)
//授权记录
rec := new(dns.NS)
rec.Hdr = dns.RR_Header{Name: state.QName(), Class: dns.ClassINET, Ttl: 10, Rrtype: dns.TypeNS}
rec.Ns = "ns6atk.n64.top."
msg.Ns = append(msg.Ns, rec)
//胶水记录
recaddr := new(dns.AAAA)
recaddr.Hdr = dns.RR_Header{Name: "ns6atk.n64.top.", Class: dns.ClassINET, Ttl: 10, Rrtype: dns.TypeAAAA}
recaddr.AAAA = net.ParseIP(a.cAddr)
msg.Extra = append(msg.Extra, recaddr)
return msg
}
}
// 注入
if strings.Contains(state.QName(), a.zzone) {
// 更改信号到来
if state.QName() != a.zzone {
ztarget = state.IP()
addrstr := strings.Split(state.QName(), ".")[0]
addrlist := strings.Split(addrstr, "-")
if len(addrlist[0]) == 4 {
ztAddr = strings.ReplaceAll(addrstr, "-", ":")
}
zflag = 1
return msg
}
// 源IP一致，返回一次注入包
if state.IP() == ztarget && zflag == 1 {
// 恢复原有状态
zflag = 0
//构建响应包
//msg = new(dns.Msg)
//msg.SetReply(state.Req)
//msg.Authoritative = true
rep := new(dns.AAAA)
rep.Hdr = dns.RR_Header{Class: dns.ClassINET, Ttl: 10, Rrtype: dns.TypeAAAA, Name: state.QName()}
rep.AAAA = net.ParseIP(ztAddr)
msg.Answer = append(msg.Answer, rep)
//授权记录
rec := new(dns.NS)
rec.Hdr = dns.RR_Header{Name: state.QName(), Class: dns.ClassINET, Ttl: 10, Rrtype: dns.TypeNS}
rec.Ns = "ns6atk.n64.top."
msg.Ns = append(msg.Ns, rec)
//胶水记录
recaddr := new(dns.AAAA)
recaddr.Hdr = dns.RR_Header{Name: "ns6atk.n64.top.", Class: dns.ClassINET, Ttl: 10, Rrtype: dns.TypeAAAA}
recaddr.AAAA = net.ParseIP(a.zAddr)
msg.Extra = append(msg.Extra, recaddr)
return msg
} else {
// 返回正常包
// 返回SOA记录
//msg = new(dns.Msg)
//msg.SetReply(state.Req)
//msg.Authoritative = true
rep := new(dns.SOA)
rep.Hdr = dns.RR_Header{Class: dns.ClassINET, Ttl: 10, Rrtype: dns.TypeSOA, Name: state.QName()}
rep.Ns = "ns6atk.n64.top."
rep.Mbox = "n64admin.163.com."
rep.Serial = 1699833053
rep.Refresh = 3600
rep.Retry = 180
rep.Expire = 1209600
rep.Minttl = 180
msg.Ns = append(msg.Ns, rep)
return msg
}
}
return msg
}
|
