#!/usr/bin/env python3
#
# SPDX-License-Identifier: BSD-2-Clause
#
# Copyright © 2022. Rubicon Communications, LLC (Netgate). All Rights Reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
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import argparse
import logging
logging.getLogger("scapy").setLevel(logging.CRITICAL)
import scapy.all as sp
import socket
import sys

PAYLOAD_MAGIC = bytes.fromhex('42c0ffee')

def ping(send_if, dst_ip, length):
	ether = sp.Ether()
	ip = sp.IP(dst=dst_ip)
	icmp = sp.ICMP(type='echo-request')
	raw = sp.raw(PAYLOAD_MAGIC)

	req = ether / ip / icmp / raw
	req = req.build()[0:length]

	sp.sendp(req, iface=send_if, verbose=False)

def main():
	parser = argparse.ArgumentParser("pft_ether.py",
		description="Ethernet test tool")
	parser.add_argument('--sendif', nargs=1,
		required=True,
		help='The interface through which the packet(s) will be sent')
	parser.add_argument('--to', nargs=1,
		required=True,
		help='The destination IP address for the ICMP echo request')
	parser.add_argument('--len', nargs=1,
		required=True,
		help='The length of the packet')

	args = parser.parse_args()

	if '-' in args.len[0]:
		s=args.len[0].split('-')
		for i in range(int(s[0]), int(s[1]) + 1):
			ping(args.sendif[0], args.to[0], i)
	else:
		ping(args.sendif[0], args.to[0], int(args.len[0]))

if __name__ == '__main__':
	main()