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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 that sends an IP ICMPv4."""
import sys
from scapy.layers.inet import ICMP, IP
from scapy.all import Ether
from resources.libraries.python.PacketVerifier import RxQueue, TxQueue
from resources.libraries.python.TrafficScriptArg import TrafficScriptArg
def is_icmp_reply(pkt):
"""Return True if pkt is echo reply, else return False. If exception occurs
return False."""
try:
if pkt['IP']['ICMP'].type == 0: # 0 - echo-reply
return True
else:
return False
except:
return False
def address_check(request, reply):
"""Compare request packet source address with reply destination address
and vice versa. If exception occurs return False."""
try:
return reply['IP'].src == request['IP'].dst \
and reply['IP'].dst == request['IP'].src
except:
return False
def main():
"""Send ICMP echo request and wait for ICMP echo reply. It ignores all other
packets."""
args = TrafficScriptArg(['dst_mac', 'src_mac', 'dst_ip', 'src_ip',
'timeout'])
dst_mac = args.get_arg('dst_mac')
src_mac = args.get_arg('src_mac')
dst_ip = args.get_arg('dst_ip')
src_ip = args.get_arg('src_ip')
tx_if = args.get_arg('tx_if')
rx_if = args.get_arg('rx_if')
timeout = int(args.get_arg('timeout'))
wait_step = 1
rxq = RxQueue(rx_if)
txq = TxQueue(tx_if)
sent_packets = []
# Create empty ip ICMP packet
icmp_request = (Ether(src=src_mac, dst=dst_mac) /
IP(src=src_ip, dst=dst_ip) /
ICMP())
# Send created packet on the interface
sent_packets.append(icmp_request)
txq.send(icmp_request)
for _ in range(1000):
icmp_reply = rxq.recv(wait_step)
if icmp_reply is None:
timeout -= wait_step
if timeout < 0:
raise RuntimeError("ICMP echo Rx timeout")
elif is_icmp_reply(icmp_reply):
if address_check(icmp_request, icmp_reply):
break
else:
raise RuntimeError("Max packet count limit reached")
print "ICMP echo reply received."
sys.exit(0)
if __name__ == "__main__":
main()
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