+++ /dev/null
-#!/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.
-
-from scapy.all import Ether, IP, ICMP
-from resources.libraries.python.PacketVerifier \
- import Interface, create_gratuitous_arp_request, auto_pad, checksum_equal
-from resources.libraries.python.TrafficScriptArg import TrafficScriptArg
-
-
-def check_ttl(ttl_begin, ttl_end, ttl_diff):
- if ttl_begin != ttl_end + ttl_diff:
- raise RuntimeError(
- "TTL changed from {} to {} but decrease by {} expected"
- .format(ttl_begin, ttl_end, ttl_diff))
-
-
-def ckeck_packets_equal(pkt_send, pkt_recv):
- pkt_send_raw = auto_pad(pkt_send)
- pkt_recv_raw = auto_pad(pkt_recv)
- if pkt_send_raw != pkt_recv_raw:
- print "Sent: {}".format(pkt_send_raw.encode('hex'))
- print "Received: {}".format(pkt_recv_raw.encode('hex'))
- print "Sent:"
- pkt_send.show2()
- print "Received:"
- pkt_recv.show2()
- raise RuntimeError("Sent packet doesn't match received packet")
-
-
-def main():
- args = TrafficScriptArg(['src_mac', 'dst_mac', 'src_ip', 'dst_ip',
- 'hops', 'first_hop_mac', 'is_dst_tg'])
-
- src_if_name = args.get_arg('tx_if')
- dst_if_name = args.get_arg('rx_if')
- is_dst_tg = True if args.get_arg('is_dst_tg') == 'True' else False
-
- src_mac = args.get_arg('src_mac')
- first_hop_mac = args.get_arg('first_hop_mac')
- dst_mac = args.get_arg('dst_mac')
- src_ip = args.get_arg('src_ip')
- dst_ip = args.get_arg('dst_ip')
- hops = int(args.get_arg('hops'))
-
- if is_dst_tg and (src_if_name == dst_if_name):
- raise RuntimeError(
- "Source interface name equals destination interface name")
-
- src_if = Interface(src_if_name)
- src_if.send_pkt(str(create_gratuitous_arp_request(src_mac, src_ip)))
- if is_dst_tg:
- dst_if = Interface(dst_if_name)
- dst_if.send_pkt(str(create_gratuitous_arp_request(dst_mac, dst_ip)))
-
- pkt_req_send = (Ether(src=src_mac, dst=first_hop_mac) /
- IP(src=src_ip, dst=dst_ip) /
- ICMP())
- src_if.send_pkt(pkt_req_send)
-
- if is_dst_tg:
- pkt_req_recv = dst_if.recv_pkt()
- if pkt_req_recv is None:
- raise RuntimeError('Timeout waiting for packet')
-
- check_ttl(pkt_req_send[IP].ttl, pkt_req_recv[IP].ttl, hops)
- pkt_req_send_mod = pkt_req_send.copy()
- pkt_req_send_mod[IP].ttl = pkt_req_recv[IP].ttl
- del pkt_req_send_mod[IP].chksum # update checksum
- ckeck_packets_equal(pkt_req_send_mod[IP], pkt_req_recv[IP])
-
- pkt_resp_send = (Ether(src=dst_mac, dst=pkt_req_recv.src) /
- IP(src=dst_ip, dst=src_ip) /
- ICMP(type=0)) # echo-reply
- dst_if.send_pkt(pkt_resp_send)
-
- pkt_resp_recv = src_if.recv_pkt()
- if pkt_resp_recv is None:
- raise RuntimeError('Timeout waiting for packet')
-
- if is_dst_tg:
- check_ttl(pkt_resp_send[IP].ttl, pkt_resp_recv[IP].ttl, hops)
- pkt_resp_send_mod = pkt_resp_send.copy()
- pkt_resp_send_mod[IP].ttl = pkt_resp_recv[IP].ttl
- del pkt_resp_send_mod[IP].chksum # update checksum
- ckeck_packets_equal(pkt_resp_send_mod[IP], pkt_resp_recv[IP])
-
- if not pkt_resp_recv.haslayer(IP):
- raise RuntimeError('Received packet does not contain IPv4 header: {}'.
- format(pkt_resp_recv.__repr__()))
-
- if pkt_resp_recv[IP].src != pkt_req_send[IP].dst:
- raise RuntimeError(
- 'Received IPv4 packet contains wrong src IP address, '
- '{} instead of {}'.format(pkt_resp_recv[IP].src,
- pkt_req_send[IP].dst))
-
- if pkt_resp_recv[IP].dst != pkt_req_send[IP].src:
- raise RuntimeError(
- 'Received IPv4 packet contains wrong dst IP address, '
- '{} instead of {}'.format(pkt_resp_recv[IP].dst,
- pkt_req_send[IP].src))
-
- # verify IPv4 checksum
- copy = pkt_resp_recv.copy()
- chksum = copy[IP].chksum
- del copy[IP].chksum
- tmp = IP(str(copy[IP]))
- if not checksum_equal(tmp.chksum, chksum):
- raise RuntimeError('Received IPv4 packet contains invalid checksum, '
- '{} instead of {}'.format(chksum, tmp.chksum))
-
- if not pkt_resp_recv[IP].haslayer(ICMP):
- raise RuntimeError(
- 'Received IPv4 packet does not contain ICMP header: {}'.
- format(pkt_resp_recv[IP].__repr__()))
-
- # verify ICMP checksum
- copy = pkt_resp_recv.copy()
- chksum = copy[IP][ICMP].chksum
- del copy[IP][ICMP].chksum
- tmp = ICMP(str(copy[IP][ICMP]))
- if not checksum_equal(tmp.chksum, chksum):
- raise RuntimeError('Received ICMP packet contains invalid checksum, '
- '{} instead of {}'.format(chksum, tmp.chksum))
-
- pkt_req_send_mod = pkt_req_send.copy()
- pkt_req_send_mod[IP][ICMP].type = pkt_resp_recv[IP][ICMP].type
- del pkt_req_send_mod[IP][ICMP].chksum # update checksum
- ckeck_packets_equal(pkt_req_send_mod[IP][ICMP], pkt_resp_recv[IP][ICMP])
-
-
-if __name__ == "__main__":
- main()
Code Review / csit.git / blobdiff