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#!/usr/bin/env python3
# Copyright (c) 2021 Cisco and/or its affiliates.
#
# SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
#
# Licensed under the Apache License 2.0 or
# GNU General Public License v2.0 or later; you may not use this file
# except in compliance with one of these Licenses. You
# may obtain a copy of the Licenses at:
#
# http://www.apache.org/licenses/LICENSE-2.0
# https://www.gnu.org/licenses/old-licenses/gpl-2.0-standalone.html
#
# Note: If this file is linked with Scapy, which is GPLv2+, your use of it
# must be under GPLv2+. If at any point in the future it is no longer linked
# with Scapy (or other GPLv2+ licensed software), you are free to choose
# Apache 2.
#
# 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.layers.inet import ICMP, IP
from scapy.layers.inet6 import IPv6, ICMPv6EchoRequest, ICMPv6EchoReply,\
ICMPv6ND_NS
from scapy.layers.l2 import Ether
from scapy.packet import Raw
from .PacketVerifier import RxQueue, TxQueue
from .TrafficScriptArg import TrafficScriptArg
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(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(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(
[u"dst_mac", u"src_mac", u"dst_ip", u"src_ip", u"timeout"]
)
dst_mac = args.get_arg(u"dst_mac")
src_mac = args.get_arg(u"src_mac")
dst_ip = args.get_arg(u"dst_ip")
src_ip = args.get_arg(u"src_ip")
tx_if = args.get_arg(u"tx_if")
rx_if = args.get_arg(u"rx_if")
timeout = int(args.get_arg(u"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):
ip_layer = IP
icmp_req = ICMP
icmp_resp = ICMP
icmp_type = 0 # echo-reply
elif valid_ipv6(src_ip) and valid_ipv6(dst_ip):
ip_layer = IP
icmp_req = ICMPv6EchoRequest
icmp_resp = ICMPv6EchoReply
icmp_type = 0 # Echo Reply
else:
raise ValueError(u"IP not in correct format")
icmp_request = (
Ether(src=src_mac, dst=dst_mac) /
ip_layer(src=src_ip, dst=dst_ip) /
icmp_req()
)
# Send created packet on the interface
icmp_request /= Raw()
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(u"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 icmp_reply[ip_layer][icmp_resp].type == icmp_type:
if icmp_reply[ip_layer].src == dst_ip and \
icmp_reply[ip_layer].dst == src_ip:
break
else:
raise RuntimeError(u"Max packet count limit reached")
print(u"ICMP echo reply received.")
sys.exit(0)
if __name__ == u"__main__":
main()
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