202 lines
6.5 KiB
Python
Executable File
202 lines
6.5 KiB
Python
Executable File
#!/usr/bin/env python
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# -
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# SPDX-License-Identifier: BSD-2-Clause
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#
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# Copyright (c) 2020 Alexander V. Chernikov
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# $FreeBSD$
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#
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from functools import partial
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import socket
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import scapy.all as sc
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import argparse
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import time
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def parse_args():
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parser = argparse.ArgumentParser(description='divert socket tester')
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parser.add_argument('--dip', type=str, help='destination packet IP')
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parser.add_argument('--sip', type=str, help='source packet IP')
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parser.add_argument('--dmac', type=str, help='packet dst mac')
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parser.add_argument('--smac', type=str, help='packet src mac')
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parser.add_argument('--iface', type=str, help='interface to use')
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parser.add_argument('--test_name', type=str, required=True,
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help='test name to run')
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return parser.parse_args()
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def send_packet(args, pkt):
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sc.sendp(pkt, iface=args.iface, verbose=False)
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def is_icmp6_echo_request(pkt):
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return pkt.type == 0x86DD and pkt.payload.nh == 58 and \
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pkt.payload.payload.type == 128
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def check_forwarded_ip_packet(orig_pkt, fwd_pkt):
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"""
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Checks that forwarded ICMP packet @fwd_ptk is the same as
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@orig_pkt. Assumes router-on-the-stick forwarding behaviour:
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* src/dst macs are swapped
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* TTL is decremented
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"""
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# Check ether fields
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assert orig_pkt.src == fwd_pkt.dst
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assert orig_pkt.dst == fwd_pkt.src
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assert len(orig_pkt) == len(fwd_pkt)
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# Check IP
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fwd_ip = fwd_pkt[sc.IP]
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orig_ip = orig_pkt[sc.IP]
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assert orig_ip.src == orig_ip.src
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assert orig_ip.dst == fwd_ip.dst
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assert orig_ip.ttl == fwd_ip.ttl + 1
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# Check ICMP
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fwd_icmp = fwd_ip[sc.ICMP]
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orig_icmp = orig_ip[sc.ICMP]
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assert bytes(orig_ip.payload) == bytes(fwd_ip.payload)
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def fwd_ip_icmp_fast(args):
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"""
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Sends ICMP packet via args.iface interface.
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Receives and checks the forwarded packet.
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Assumes forwarding router decrements TTL
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"""
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def filter_f(x):
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return x.src == args.dmac and x.type == 0x0800
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e = sc.Ether(src=args.smac, dst=args.dmac)
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ip = sc.IP(src=args.sip, dst=args.dip)
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icmp = sc.ICMP(type='echo-request')
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pkt = e / ip / icmp
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send_cb = partial(send_packet, args, pkt)
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packets = sc.sniff(iface=args.iface, started_callback=send_cb,
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stop_filter=filter_f, lfilter=filter_f, timeout=5)
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assert len(packets) > 0
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fwd_pkt = packets[-1]
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try:
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check_forwarded_ip_packet(pkt, fwd_pkt)
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except Exception as e:
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print('Original packet:')
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pkt.show()
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print('Forwarded packet:')
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fwd_pkt.show()
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for a_packet in packets:
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a_packet.summary()
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raise Exception from e
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def fwd_ip_icmp_slow(args):
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"""
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Sends ICMP packet via args.iface interface.
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Forces slow path processing by introducing IP option.
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Receives and checks the forwarded packet.
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Assumes forwarding router decrements TTL
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"""
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def filter_f(x):
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return x.src == args.dmac and x.type == 0x0800
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e = sc.Ether(src=args.smac, dst=args.dmac)
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# Add IP option to switch to 'normal' IP processing
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stream_id = sc.IPOption_Stream_Id(security=0xFFFF)
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ip = sc.IP(src=args.sip, dst=args.dip,
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options=[sc.IPOption_Stream_Id(security=0xFFFF)])
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icmp = sc.ICMP(type='echo-request')
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pkt = e / ip / icmp
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send_cb = partial(send_packet, args, pkt)
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packets = sc.sniff(iface=args.iface, started_callback=send_cb,
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stop_filter=filter_f, lfilter=filter_f, timeout=5)
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assert len(packets) > 0
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check_forwarded_ip_packet(pkt, packets[-1])
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def check_forwarded_ip6_packet(orig_pkt, fwd_pkt):
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"""
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Checks that forwarded ICMP packet @fwd_ptk is the same as
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@orig_pkt. Assumes router-on-the-stick forwarding behaviour:
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* src/dst macs are swapped
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* TTL is decremented
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"""
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# Check ether fields
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assert orig_pkt.src == fwd_pkt.dst
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assert orig_pkt.dst == fwd_pkt.src
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assert len(orig_pkt) == len(fwd_pkt)
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# Check IP
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fwd_ip = fwd_pkt[sc.IPv6]
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orig_ip = orig_pkt[sc.IPv6]
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assert orig_ip.src == orig_ip.src
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assert orig_ip.dst == fwd_ip.dst
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assert orig_ip.hlim == fwd_ip.hlim + 1
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# Check ICMPv6
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assert bytes(orig_ip.payload) == bytes(fwd_ip.payload)
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def fwd_ip6_icmp(args):
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"""
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Sends ICMPv6 packet via args.iface interface.
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Receives and checks the forwarded packet.
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Assumes forwarding router decrements TTL
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"""
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def filter_f(x):
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return x.src == args.dmac and is_icmp6_echo_request(x)
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e = sc.Ether(src=args.smac, dst=args.dmac)
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ip = sc.IPv6(src=args.sip, dst=args.dip)
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icmp = sc.ICMPv6EchoRequest()
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pkt = e / ip / icmp
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send_cb = partial(send_packet, args, pkt)
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packets = sc.sniff(iface=args.iface, started_callback=send_cb,
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stop_filter=filter_f, lfilter=filter_f, timeout=5)
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assert len(packets) > 0
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fwd_pkt = packets[-1]
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try:
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check_forwarded_ip6_packet(pkt, fwd_pkt)
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except Exception as e:
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print('Original packet:')
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pkt.show()
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print('Forwarded packet:')
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fwd_pkt.show()
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for idx, a_packet in enumerate(packets):
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print('{}: {}'.format(idx, a_packet.summary()))
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raise Exception from e
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def main():
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args = parse_args()
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test_ptr = globals()[args.test_name]
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test_ptr(args)
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if __name__ == '__main__':
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main()
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