1#!/usr/bin/env python3
2#
3# SPDX-License-Identifier: BSD-2-Clause
4#
5# Copyright (c) 2021 Rubicon Communications, LLC (Netgate)
6#
7# Redistribution and use in source and binary forms, with or without
8# modification, are permitted provided that the following conditions
9# are met:
10# 1. Redistributions of source code must retain the above copyright
11#    notice, this list of conditions and the following disclaimer.
12# 2. Redistributions in binary form must reproduce the above copyright
13#    notice, this list of conditions and the following disclaimer in the
14#    documentation and/or other materials provided with the distribution.
15#
16# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26# SUCH DAMAGE.
27
28import argparse
29import logging
30logging.getLogger("scapy").setLevel(logging.CRITICAL)
31import scapy.all as sp
32
33def syn_flood(args):
34	s = sp.conf.L2socket(iface=args.sendif[0])
35
36	# Set a src mac, to avoid doing lookups which really slow us down.
37	ether = sp.Ether(src='01:02:03:04:05')
38	ip = sp.IP(dst=args.to[0])
39	for i in range(int(args.count[0])):
40		tcp = sp.TCP(flags='S', sport=1+i, dport=22, seq=500+i)
41		pkt = ether / ip / tcp
42		s.send(pkt)
43
44def main():
45	parser = argparse.ArgumentParser("pft_synflood.py",
46		description="SYN flooding tool")
47	parser.add_argument('--sendif', nargs=1,
48		required=True,
49		help='The interface through which the packet(s) will be sent')
50	parser.add_argument('--to', nargs=1,
51		required=True,
52		help='The destination IP address for the SYN packets')
53	parser.add_argument('--count', nargs=1,
54		required=True,
55		help='The number of packets to send')
56
57	args = parser.parse_args()
58
59	syn_flood(args)
60
61if __name__ == '__main__':
62	main()
63