Skip to content

Python3 で scapy を用いてパケットを送信するサンプルスクリプト

Python3 で scapy を用いてパケットを送信するサンプルをメモしておきます。

スクリプト

 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
#!/usr/bin/env python

import argparse
import sys
from scapy.all import *


def get_alphabets(count: int) -> str:
    alphabets = list(range(97, 123))
    alphabets.extend(list(range(65, 91)))
    return get_characters(alphabets, count)


def get_characters(alphabets: list, count: int) -> str:
    result = ''
    index = 0
    for i in range(0, count):
        result += chr(alphabets[index])
        index += 1
        if len(alphabets) <= index:
            index = 0
    return result


if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument('-f', '--fragmentsize', default=500,
                        type=int, help="Fragment size")
    parser.add_argument('-i', '--id', default=12345, type=int, help="ID")
    parser.add_argument('-l', '--length', default=1500,
                        type=int, help="Packet length")
    parser.add_argument('-s', '--sport', default=10001,
                        type=int, help="Source port")
    parser.add_argument('-d', '--dport', default=10002,
                        type=int, help="Destination port")
    parser.add_argument('-p', '--protocol', default="udp",
                        type=str, help="Protocol")
    parser.add_argument('address', type=str, help="Destination address")
    args = parser.parse_args()

    payload = get_alphabets(args.length)

    if args.protocol.lower() == "icmp":
        packet = IP(dst=args.address, id=args.id) / \
            ICMP()/payload
    elif args.protocol.lower() == "udp":
        packet = IP(dst=args.address, id=args.id) / \
            UDP(sport=args.sport, dport=args.dport)/payload
    elif args.protocol.lower() == "tcp":
        packet = IP(dst=args.address, id=args.id) / \
            TCP(sport=args.sport, dport=args.dport)/payload
    else:
        sys.exit(-1)

    frags = fragment(packet, fragsize=args.fragmentsize)
    count = 1
    for fragment in frags:
        count += 1
        send(fragment, verbose=False)
    print("Sent " + str(count) + " " + args.protocol.lower() + " packet(s).")