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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 or ICMPv6."""
import sys
import ipaddress
from scapy.all import Ether
from scapy.layers.inet import ICMP, IP
from scapy.layers.inet6 import IPv6, ICMPv6EchoRequest, ICMPv6ND_NS
from resources.libraries.python.PacketVerifier import RxQueue, TxQueue
from resources.libraries.python.TrafficScriptArg import TrafficScriptArg
def is_icmp_reply(pkt, ipformat):
"""Return True if pkt is echo reply, else return False. If exception occurs
return False.
:param pkt: Packet.
:param ipformat: Dictionary of names to distinguish IPv4 and IPv6.
:type pkt: dict
:type ipformat: dict
:rtype: bool
"""
# pylint: disable=bare-except
try:
if pkt[ipformat['IPType']][ipformat['ICMP_rep']].type == \
ipformat['Type']:
return True
else:
return False
except: # pylint: disable=bare-except
return False
def address_check(request, reply, ipformat):
"""Compare request packet source address with reply destination address
and vice versa. If exception occurs return False.
:param request: Sent packet containing request.
:param reply: Received packet containing reply.
:param ipformat: Dictionary of names to distinguish IPv4 and IPv6.
:type request: dict
:type reply: dict
:type ipformat: dict
:rtype: bool
"""
# pylint: disable=bare-except
try:
r_src = reply[ipformat['IPType']].src == request[ipformat['IPType']].dst
r_dst = reply[ipformat['IPType']].dst == request[ipformat['IPType']].src
return r_src and r_dst
except: # pylint: disable=bare-except
return False
def valid_ipv4(ip):
"""Check if IP address has the correct IPv4 address format.
:param ip: IP address.
:type ip: str
:return: True in case of correct IPv4 address format,
otherwise return False.
:rtype: bool
"""
try:
ipaddress.IPv4Address(unicode(ip))
return True
except (AttributeError, ipaddress.AddressValueError):
return False
def valid_ipv6(ip):
"""Check if IP address has the correct IPv6 address format.
:param ip: IP address.
:type ip: str
:return: True in case of correct IPv6 address format,
otherwise return False.
:rtype: bool
"""
try:
ipaddress.IPv6Address(unicode(ip))
return True
except (AttributeError, ipaddress.AddressValueError):
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
if valid_ipv4(src_ip) and valid_ipv4(dst_ip):
icmp_request = (Ether(src=src_mac, dst=dst_mac) /
IP(src=src_ip, dst=dst_ip) /
ICMP())
ip_format = {'IPType': 'IP', 'ICMP_req': 'ICMP',
'ICMP_rep': 'ICMP', 'Type': 0}
elif valid_ipv6(src_ip) and valid_ipv6(dst_ip):
icmp_request = (Ether(src=src_mac, dst=dst_mac) /
IPv6(src=src_ip, dst=dst_ip) /
ICMPv6EchoRequest())
ip_format = {'IPType': 'IPv6', 'ICMP_req': 'ICMPv6 Echo Request',
'ICMP_rep': 'ICMPv6 Echo Reply', 'Type': 129}
else:
raise ValueError("IP not in correct format")
# Send created packet on the interface
sent_packets.append(icmp_request)
txq.send(icmp_request)
for _ in range(1000):
while True:
icmp_reply = rxq.recv(wait_step, ignore=sent_packets)
if icmp_reply is None:
timeout -= wait_step
if timeout < 0:
raise RuntimeError("ICMP echo Rx timeout")
elif icmp_reply.haslayer(ICMPv6ND_NS):
# read another packet in the queue in case of ICMPv6ND_NS packet
continue
else:
# otherwise process the current packet
break
if is_icmp_reply(icmp_reply, ip_format):
if address_check(icmp_request, icmp_reply, ip_format):
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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