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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.
"""Traffic script for IPv4 sweep ping."""
import logging
import os
import sys
logging.getLogger("scapy.runtime").setLevel(logging.ERROR)
from resources.libraries.python.PacketVerifier import RxQueue, TxQueue, \
create_gratuitous_arp_request, checksum_equal
from resources.libraries.python.TrafficScriptArg import TrafficScriptArg
from scapy.layers.inet import IP, ICMP
from scapy.all import Ether, Raw
def main():
# start_size - start size of the ICMPv4 echo data
# end_size - end size of the ICMPv4 echo data
# step - increment step
args = TrafficScriptArg(['src_mac', 'dst_mac', 'src_ip', 'dst_ip',
'start_size', 'end_size', 'step'])
rxq = RxQueue(args.get_arg('rx_if'))
txq = TxQueue(args.get_arg('tx_if'))
src_mac = args.get_arg('src_mac')
dst_mac = args.get_arg('dst_mac')
src_ip = args.get_arg('src_ip')
dst_ip = args.get_arg('dst_ip')
start_size = int(args.get_arg('start_size'))
end_size = int(args.get_arg('end_size'))
step = int(args.get_arg('step'))
echo_id = 0xa
# generate some random data buffer
data = bytearray(os.urandom(end_size))
sent_packets = []
pkt_send = create_gratuitous_arp_request(src_mac, src_ip)
sent_packets.append(pkt_send)
txq.send(pkt_send)
# send ICMP echo request with incremented data length and receive ICMP
# echo reply
for echo_seq in range(start_size, end_size + 1, step):
pkt_send = (Ether(src=src_mac, dst=dst_mac) /
IP(src=src_ip, dst=dst_ip) /
ICMP(id=echo_id, seq=echo_seq) /
Raw(load=data[0:echo_seq]))
sent_packets.append(pkt_send)
txq.send(pkt_send)
ether = rxq.recv(ignore=sent_packets)
if ether is None:
raise RuntimeError(
'ICMP echo reply seq {0} Rx timeout'.format(echo_seq))
if not ether.haslayer(IP):
raise RuntimeError(
'Unexpected packet with no IPv4 received {0}'.format(
ether.__repr__()))
ipv4 = ether['IP']
if not ipv4.haslayer(ICMP):
raise RuntimeError(
'Unexpected packet with no ICMP received {0}'.format(
ipv4.__repr__()))
icmpv4 = ipv4['ICMP']
if icmpv4.id != echo_id or icmpv4.seq != echo_seq:
raise RuntimeError(
'Invalid ICMP echo reply received ID {0} seq {1} should be '
'ID {2} seq {3}, {0}'.format(icmpv4.id, icmpv4.seq, echo_id,
echo_seq))
chksum = icmpv4.chksum
del icmpv4.chksum
tmp = ICMP(str(icmpv4))
if not checksum_equal(tmp.chksum, chksum):
raise RuntimeError(
'Invalid checksum {0} should be {1}'.format(chksum, tmp.chksum))
if 'Raw' in icmpv4:
load = icmpv4['Raw'].load
else:
load = ""
if load != data[0:echo_seq]:
raise RuntimeError(
'Received ICMP payload does not match sent payload')
sent_packets.remove(pkt_send)
sys.exit(0)
if __name__ == "__main__":
main()
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