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head/tests/sys/netinet/redirect.py
| Property | Old Value | New Value |
|---|---|---|
| svn:eol-style | null | native \ No newline at end of property |
| svn:executable | null | * \ No newline at end of property |
| svn:keywords | null | FreeBSD=%H \ No newline at end of property |
| svn:mime-type | null | text/plain \ No newline at end of property |
| #!/usr/bin/env python | |||||
| # - | |||||
| # SPDX-License-Identifier: BSD-2-Clause | |||||
| # | |||||
| # Copyright (c) 2020 Alexander V. Chernikov | |||||
| # | |||||
| # 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 | |||||
| # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |||||
| # 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. | |||||
| # | |||||
| # $FreeBSD$ | |||||
| # | |||||
| import argparse | |||||
| import scapy.all as sc | |||||
| import socket | |||||
| import sys | |||||
| import fcntl | |||||
| import struct | |||||
| def parse_args(): | |||||
| parser = argparse.ArgumentParser(description='ICMP redirect generator') | |||||
| parser.add_argument('--smac', type=str, required=True, | |||||
| help='eth source mac') | |||||
| parser.add_argument('--dmac', type=str, required=True, | |||||
| help='eth dest mac') | |||||
| parser.add_argument('--sip', type=str, required=True, | |||||
| help='remote router source ip') | |||||
| parser.add_argument('--dip', type=str, required=True, | |||||
| help='local router ip') | |||||
| parser.add_argument('--iface', type=str, required=True, | |||||
| help='ifname to send packet to') | |||||
| parser.add_argument('--route', type=str, required=True, | |||||
| help='destination IP to redirect') | |||||
| parser.add_argument('--gw', type=str, required=True, | |||||
| help='redirect GW') | |||||
| return parser.parse_args() | |||||
| def construct_icmp_redirect(smac, dmac, sip, dip, route_dst, route_gw): | |||||
| e = sc.Ether(src=smac, dst=dmac) | |||||
| l3 = sc.IP(src=sip, dst=dip) | |||||
| icmp = sc.ICMP(type=5, code=1, gw=route_gw) | |||||
| orig_ip = sc.IP(src=sip, dst=route_dst) | |||||
| return e / l3 / icmp / orig_ip / sc.UDP() | |||||
| def send_packet(pkt, iface, feedback=False): | |||||
| if feedback: | |||||
| # Make kernel receive the packet as well | |||||
| BIOCFEEDBACK = 0x8004427c | |||||
| socket = sc.conf.L2socket(iface=args.iface) | |||||
| fcntl.ioctl(socket.ins, BIOCFEEDBACK, struct.pack('I', 1)) | |||||
| sc.sendp(pkt, socket=socket, verbose=True) | |||||
| else: | |||||
| sc.sendp(pkt, iface=iface, verbose=False) | |||||
| def main(): | |||||
| args = parse_args() | |||||
| pkt = construct_icmp_redirect(args.smac, args.dmac, args.sip, args.dip, | |||||
| args.route, args.gw) | |||||
| send_packet(pkt, args.iface) | |||||
| if __name__ == '__main__': | |||||
| main() | |||||