-#!/usr/bin/env python
+#!/usr/bin/env python3
-# Copyright (c) 2016 Cisco and/or its affiliates.
+# Copyright (c) 2019 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:
import sys
import logging
-# pylint: disable=no-name-in-module
-# pylint: disable=import-error
-logging.getLogger("scapy.runtime").setLevel(logging.ERROR)
-from scapy.all import Ether, IP, IPv6, TCP
from ipaddress import ip_address
+from scapy.layers.l2 import Ether
+from scapy.layers.inet import IP, TCP
+from scapy.layers.inet6 import IPv6, ICMPv6ND_NS
+from scapy.packet import Raw
from resources.libraries.python.TrafficScriptArg import TrafficScriptArg
from resources.libraries.python.PacketVerifier import RxQueue, TxQueue
:raises RuntimeError: If received packet is invalid.
"""
if not pkt_recv.haslayer(IP):
- raise RuntimeError(
- 'Not an IPv4 packet received: {0}'.format(pkt_recv.__repr__()))
+ raise RuntimeError(f"Not an IPv4 packet received: {pkt_recv!r}")
- rx_dscp = pkt_recv['IP'].tos >> 2
+ rx_dscp = pkt_recv[IP].tos >> 2
if rx_dscp != dscp:
- raise RuntimeError(
- 'Invalid DSCP {0} should be {1}'.format(rx_dscp, dscp))
+ raise RuntimeError(f"Invalid DSCP {rx_dscp} should be {dscp}")
if not pkt_recv.haslayer(TCP):
- raise RuntimeError(
- 'Not a TCP packet received: {0}'.format(pkt_recv.__repr__()))
+ raise RuntimeError(f"Not a TCP packet received: {pkt_recv!r}")
def check_ipv6(pkt_recv, dscp):
:raises RuntimeError: If received packet is invalid.
"""
if not pkt_recv.haslayer(IPv6):
- raise RuntimeError(
- 'Not an IPv6 packet received: {0}'.format(pkt_recv.__repr__()))
+ raise RuntimeError(f"Not an IPv6 packet received: {pkt_recv!r}")
- rx_dscp = pkt_recv['IPv6'].tc >> 2
+ rx_dscp = pkt_recv[IPv6].tc >> 2
if rx_dscp != dscp:
- raise RuntimeError(
- 'Invalid DSCP {0} should be {1}'.format(rx_dscp, dscp))
+ raise RuntimeError(f"Invalid DSCP {rx_dscp} should be {dscp}")
if not pkt_recv.haslayer(TCP):
- raise RuntimeError(
- 'Not a TCP packet received: {0}'.format(pkt_recv.__repr__()))
+ raise RuntimeError(f"Not a TCP packet received: {pkt_recv!r}")
-# pylint: disable=too-many-locals
-# pylint: disable=too-many-statements
+# TODO: Pylint says too-many-locals and too-many-statements. Refactor!
def main():
"""Send and receive TCP packet."""
- args = TrafficScriptArg(['src_mac', 'dst_mac', 'src_ip', 'dst_ip', 'dscp'])
+ args = TrafficScriptArg(
+ [u"src_mac", u"dst_mac", u"src_ip", u"dst_ip", u"dscp"]
+ )
- rxq = RxQueue(args.get_arg('rx_if'))
- txq = TxQueue(args.get_arg('tx_if'))
+ rxq = RxQueue(args.get_arg(u"rx_if"))
+ txq = TxQueue(args.get_arg(u"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')
- dscp = int(args.get_arg('dscp'))
+ src_mac = args.get_arg(u"src_mac")
+ dst_mac = args.get_arg(u"dst_mac")
+ src_ip = args.get_arg(u"src_ip")
+ dst_ip = args.get_arg(u"dst_ip")
+ dscp = int(args.get_arg(u"dscp"))
- if 6 == ip_address(unicode(src_ip)).version:
- is_ipv4 = False
- else:
- is_ipv4 = True
-
- sent_packets = []
-
- if is_ipv4:
- ip_pkt = IP(src=src_ip, dst=dst_ip) / \
- TCP()
- else:
- ip_pkt = IPv6(src=src_ip, dst=dst_ip) / \
- TCP()
+ ip_layer = IPv6 if ip_address(src_ip).version == 6 else IP
- pkt_send = Ether(src=src_mac, dst=dst_mac) / \
- ip_pkt
+ sent_packets = list()
+ pkt_send = (Ether(src=src_mac, dst=dst_mac) /
+ ip_layer(src=src_ip, dst=dst_ip) /
+ TCP())
+ pkt_send /= Raw()
sent_packets.append(pkt_send)
txq.send(pkt_send)
- pkt_recv = rxq.recv(2, sent_packets)
+ while True:
+ pkt_recv = rxq.recv(2, sent_packets)
+ if pkt_recv is None:
+ raise RuntimeError(u"ICMPv6 echo reply Rx timeout")
+
+ if pkt_recv.haslayer(ICMPv6ND_NS):
+ # read another packet in the queue if the current one is ICMPv6ND_NS
+ continue
+ else:
+ # otherwise process the current packet
+ break
if pkt_recv is None:
- raise RuntimeError('Rx timeout')
+ raise RuntimeError(u"Rx timeout")
- if is_ipv4:
+ if ip_layer == IP:
check_ipv4(pkt_recv, dscp)
else:
check_ipv6(pkt_recv, dscp)
sys.exit(0)
-if __name__ == "__main__":
+
+if __name__ == u"__main__":
main()