a26e895f3d
Since 2.4.5 scapy started issuing warnings about a few different
configurations during our tests. These are harmless, but they generate
stderr output, which upsets atf_check.
Configure scapy to only log critical errors (and thus not warnings) to
fix these tests.
MFC after: 1 week
Sponsored by: Rubicon Communications, LLC ("Netgate")
276 lines
7.5 KiB
Python
276 lines
7.5 KiB
Python
#!/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) 2019 Netflix, Inc.
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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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import argparse
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import logging
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logging.getLogger("scapy").setLevel(logging.CRITICAL)
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import scapy.all as sp
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import socket
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import sys
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import frag6.sniffer as Sniffer
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from time import sleep
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def check_icmp6_error_dst_unreach_noport(args, packet):
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ip6 = packet.getlayer(sp.IPv6)
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if not ip6:
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return False
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oip6 = sp.IPv6(src=args.src[0], dst=args.to[0])
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if ip6.dst != oip6.src:
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return False
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icmp6 = packet.getlayer(sp.ICMPv6DestUnreach)
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if not icmp6:
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return False
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# ICMP6_DST_UNREACH_NOPORT 4
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if icmp6.code != 4:
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return False
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# Should we check the payload as well?
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# We are running in a very isolated environment and nothing else
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# should trigger an ICMPv6 Dest Unreach / Port Unreach so leave it.
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#icmp6.display()
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return True
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def check_icmp6_error_paramprob_header(args, packet):
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ip6 = packet.getlayer(sp.IPv6)
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if not ip6:
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return False
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oip6 = sp.IPv6(src=args.src[0], dst=args.to[0])
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if ip6.dst != oip6.src:
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return False
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icmp6 = packet.getlayer(sp.ICMPv6ParamProblem)
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if not icmp6:
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return False
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# ICMP6_PARAMPROB_HEADER 0
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if icmp6.code != 0:
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return False
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# Should we check the payload as well?
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# We are running in a very isolated environment and nothing else
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# should trigger an ICMPv6 Param Prob so leave it.
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#icmp6.display()
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return True
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def check_tcp_rst(args, packet):
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ip6 = packet.getlayer(sp.IPv6)
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if not ip6:
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return False
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oip6 = sp.IPv6(src=args.src[0], dst=args.to[0])
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if ip6.dst != oip6.src:
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return False
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tcp = packet.getlayer(sp.TCP)
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if not tcp:
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return False
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# Is TCP RST?
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if tcp.flags & 0x04:
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#tcp.display()
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return True
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return False
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def addExt(ext, h):
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if h is None:
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return ext
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if ext is None:
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ext = h
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else:
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ext = ext / h
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return ext
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def getExtHdrs(args):
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ext = None
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# XXX-TODO Try to put them in an order which could make sense
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# in real life packets and according to the RFCs.
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if args.hbh:
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hbh = sp.IPv6ExtHdrHopByHop(options = \
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sp.PadN(optdata="\x00\x00\x00\x00\x00\x00"))
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ext = addExt(ext, hbh)
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if args.rh:
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rh = sp.IPv6ExtHdrRouting(type = 0)
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ext = addExt(ext, rh)
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if args.frag6:
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frag6 = sp.IPv6ExtHdrFragment(offset=0, m=0, id=0x1234)
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ext = addExt(ext, frag6)
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if args.esp:
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# XXX TODO
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esp = None
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ext = addExt(ext, esp)
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if args.ah:
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# XXX TODO
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ah = None
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ext = addExt(ext, ah)
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if args.dest:
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dest = sp.IPv6ExtHdrDestOpt(options = \
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sp.PadN(optdata="\x00\x00\x00\x00\x00\x00"))
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ext = addExt(ext, dest)
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if args.mobi:
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# XXX TODO
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mobi = None
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ext = addExt(ext, mobi)
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if args.hip:
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# XXX TODO
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hip = None
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ext = addExt(ext, hip)
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if args.shim6:
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# XXX TODO
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shim6 = None
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ext = addExt(ext, shim6)
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if args.proto253:
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# XXX TODO
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tft = None
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ext = addExt(ext, tft)
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if args.proto254:
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# XXX TODO
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tff = None
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ext = addExt(ext, tff)
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if args.hbhbad:
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hbhbad = sp.IPv6ExtHdrHopByHop(options = \
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sp.PadN(optdata="\x00\x00\x00\x00\x00\x00"))
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ext = addExt(ext, hbhbad)
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return ext
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def main():
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parser = argparse.ArgumentParser("exthdr.py",
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description="IPv6 extension header test tool")
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parser.add_argument('--sendif', nargs=1,
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required=True,
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help='The interface through which the packet will be sent')
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parser.add_argument('--recvif', nargs=1,
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required=True,
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help='The interface on which to check for the packet')
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parser.add_argument('--src', nargs=1,
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required=True,
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help='The source IP address')
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parser.add_argument('--to', nargs=1,
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required=True,
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help='The destination IP address')
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parser.add_argument('--debug',
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required=False, action='store_true',
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help='Enable test debugging')
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# Extension Headers
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# See https://www.iana.org/assignments/ipv6-parameters/ipv6-parameters.xhtml
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parser.add_argument('--hbh',
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required=False, action='store_true',
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help='Add IPv6 Hop-by-Hop Option')
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parser.add_argument('--hbhbad',
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required=False, action='store_true',
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help='Add IPv6 Hop-by-Hop Option at an invalid position')
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parser.add_argument('--rh',
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required=False, action='store_true',
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help='Add Routing Header for IPv6')
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parser.add_argument('--frag6',
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required=False, action='store_true',
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help='Add Fragment Header for IPv6')
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parser.add_argument('--esp',
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required=False, action='store_true',
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help='Add Encapsulating Security Payload')
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parser.add_argument('--ah',
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required=False, action='store_true',
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help='Add Authentication Header')
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parser.add_argument('--dest',
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required=False, action='store_true',
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help='Add Destination Options for IPv6')
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parser.add_argument('--mobi',
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required=False, action='store_true',
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help='Add Mobility Header')
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parser.add_argument('--hip',
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required=False, action='store_true',
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help='Add Host Identity Protocol')
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parser.add_argument('--shim6',
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required=False, action='store_true',
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help='Add Shim6 Protocol')
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parser.add_argument('--proto253',
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required=False, action='store_true',
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help='Use for experimentation and testing (253)')
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parser.add_argument('--proto254',
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required=False, action='store_true',
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help='Use for experimentation and testing (254)')
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args = parser.parse_args()
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if args.hbhbad:
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ok = 0
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else:
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ok = 1
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########################################################################
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#
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# Send IPv6 packets with one or more extension headers (combinations
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# mmight not always make sense depending what user tells us).
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# We are trying to cover the basic loop and passing mbufs on
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# and making sure m_pullup() works.
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# Try for at least UDP and TCP upper layer payloads.
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#
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# Expectations: no panics
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# We are not testing for any other outcome here.
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#
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data = "6" * 88
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udp = sp.UDP(dport=3456, sport=6543) / data
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tcp = sp.TCP(dport=4567, sport=7654)
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ip6 = sp.Ether() / sp.IPv6(src=args.src[0], dst=args.to[0])
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for ulp in [ udp, tcp ]:
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ext = getExtHdrs(args)
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if ext is not None:
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pkt = ip6 / ext / ulp
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else:
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pkt = ip6 / ulp
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if args.debug :
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pkt.display()
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if not ok:
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sc = check_icmp6_error_paramprob_header;
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elif ulp == udp:
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sc = check_icmp6_error_dst_unreach_noport;
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elif ulp == tcp:
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sc = check_tcp_rst;
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else:
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sys.exit(2)
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# Start sniffing on recvif
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sniffer = Sniffer.Sniffer(args, sc)
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sp.sendp(pkt, iface=args.sendif[0], verbose=False)
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sleep(0.10)
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sniffer.setEnd()
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sniffer.join()
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if not sniffer.foundCorrectPacket:
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sys.exit(not ok)
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sys.exit(0)
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if __name__ == '__main__':
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main()
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