-#!/usr/bin/env python
+#!/usr/bin/env python3
+
# 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.
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 scapy.layers.inet6 import IPv6, ICMPv6EchoRequest, ICMPv6EchoReply,\
+ ICMPv6ND_NS
+from scapy.layers.l2 import Ether
+from scapy.packet import Raw
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.
:rtype: bool
"""
try:
- ipaddress.IPv4Address(unicode(ip))
+ ipaddress.IPv4Address(ip)
return True
except (AttributeError, ipaddress.AddressValueError):
return False
:rtype: bool
"""
try:
- ipaddress.IPv6Address(unicode(ip))
+ 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(['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'))
+ 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)
# 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}
+ ip_layer = IP
+ icmp_req = ICMP
+ icmp_resp = ICMP
+ icmp_type = 0 # echo-reply
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}
+ ip_layer = IP
+ icmp_req = ICMPv6EchoRequest
+ icmp_resp = ICMPv6EchoReply
+ icmp_type = 0 # Echo Reply
else:
- raise ValueError("IP not in correct format")
+ 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)
if icmp_reply is None:
timeout -= wait_step
if timeout < 0:
- raise RuntimeError("ICMP echo Rx timeout")
+ 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
# otherwise process the current packet
break
- if is_icmp_reply(icmp_reply, ip_format):
- if address_check(icmp_request, icmp_reply, ip_format):
+ 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("Max packet count limit reached")
+ raise RuntimeError(u"Max packet count limit reached")
- print "ICMP echo reply received."
+ print(u"ICMP echo reply received.")
sys.exit(0)
-if __name__ == "__main__":
+if __name__ == u"__main__":
main()
Code Review / csit.git / blobdiff