-
Notifications
You must be signed in to change notification settings - Fork 1
/
main.go
74 lines (60 loc) · 1.37 KB
/
main.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
package main
import (
b64 "encoding/base64"
"fmt"
"math/rand"
"net"
"os"
"time"
)
const (
CONN_HOST = "0.0.0.0"
CONN_PORT = "1337"
CONN_TYPE = "tcp"
DNS_RECORD = "The flag is not here, you should enumerate (passively) more, try harder!"
)
func chunkSlice(slice string, chunkSize int) []string {
var chunks []string
for i := 0; i < len(slice); i += chunkSize {
end := i + chunkSize
if end > len(slice) {
end = len(slice)
}
chunks = append(chunks, slice[i:end])
}
return chunks
}
func shuffle(vals []string) string {
r := rand.New(rand.NewSource(time.Now().Unix()))
ret := make([]string, len(vals))
n := len(vals)
for i := 0; i < n; i++ {
randIndex := r.Intn(len(vals))
ret[i] = vals[randIndex]
}
return ret[0]
}
func main() {
sEnc := b64.StdEncoding.EncodeToString([]byte(DNS_RECORD))
sChunked := chunkSlice(sEnc, 12)
l, err := net.Listen(CONN_TYPE, CONN_HOST+":"+CONN_PORT)
if err != nil {
fmt.Println("Error listening:", err.Error())
os.Exit(1)
}
defer l.Close()
fmt.Println("Listening on " + CONN_HOST + ":" + CONN_PORT)
for {
conn, err := l.Accept()
if err != nil {
fmt.Println("Error accepting: ", err.Error())
os.Exit(1)
}
go handleRequest(conn, sChunked)
}
}
func handleRequest(conn net.Conn, sChunked []string) {
fmt.Println(time.Now(), conn.RemoteAddr())
conn.Write([]byte(shuffle(sChunked)))
conn.Close()
}