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#!/usr/bin/env python
# Copyright (c) 2016 Cisco and/or its affiliates.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Send an ARP request and verify the reply"""
import sys
from scapy.all import Ether, ARP
from resources.libraries.python.PacketVerifier import Interface
from resources.libraries.python.TrafficScriptArg import TrafficScriptArg
def parse_arguments():
"""Parse arguments of the script passed through command line
:return: tuple of parsed arguments
"""
args = TrafficScriptArg(['src_if', 'src_mac', 'dst_mac',
'src_ip', 'dst_ip'])
# check for mandatory parameters
params = (args.get_arg('tx_if'),
args.get_arg('src_mac'),
args.get_arg('dst_mac'),
args.get_arg('src_ip'),
args.get_arg('dst_ip'))
if None in params:
raise Exception('Missing mandatory parameter(s)!')
return params
def arp_request_test():
"""Send ARP request, expect a reply and verify its fields.
returns: test status
:raises RuntimeError: ARP reply timeout.
"""
test_passed = False
(src_if, src_mac, dst_mac, src_ip, dst_ip) = parse_arguments()
interface = Interface(src_if)
# build an ARP request
arp_request = (Ether(src=src_mac, dst='ff:ff:ff:ff:ff:ff') /
ARP(psrc=src_ip, hwsrc=src_mac, pdst=dst_ip,
hwdst='ff:ff:ff:ff:ff:ff'))
# send the request
interface.send_pkt(arp_request)
try:
# wait for APR reply
ether = interface.recv_pkt()
if not ether:
raise RuntimeError("ARP reply timeout")
# verify received packet
if not ether.haslayer(ARP):
raise RuntimeError('Unexpected packet: does not contain ARP ' +
'header "{}"'.format(ether.__repr__()))
arp = ether['ARP']
arp_reply = 2
if arp.op != arp_reply:
raise RuntimeError('expected op={}, received {}'.format(arp_reply,
arp.op))
if arp.ptype != 0x800:
raise RuntimeError('expected ptype=0x800, received {}'.
format(arp.ptype))
if arp.hwlen != 6:
raise RuntimeError('expected hwlen=6, received {}'.
format(arp.hwlen))
if arp.plen != 4:
raise RuntimeError('expected plen=4, received {}'.format(arp.plen))
if arp.hwsrc != dst_mac:
raise RuntimeError('expected hwsrc={}, received {}'.
format(dst_mac, arp.hwsrc))
if arp.psrc != dst_ip:
raise RuntimeError('expected psrc={}, received {}'.
format(dst_ip, arp.psrc))
if arp.hwdst != src_mac:
raise RuntimeError('expected hwdst={}, received {}'.
format(src_mac, arp.hwdst))
if arp.pdst != src_ip:
raise RuntimeError('expected pdst={}, received {}'.
format(src_ip, arp.pdst))
test_passed = True
except RuntimeError as ex:
print 'Error occurred: {}'.format(ex)
return test_passed
def main():
"""Run the test and collect result"""
if arp_request_test():
sys.exit(0)
else:
sys.exit(1)
if __name__ == '__main__':
main()
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