From 681bb937b97b0c2bf10595e2042cf5943d61896b Mon Sep 17 00:00:00 2001 From: Matej Klotton Date: Thu, 2 Jun 2016 17:41:24 +0200 Subject: Add test VPP honors DHCPv4 lease time -JIRA: CSIT-130 Change-Id: I1d0a92e8865021ac5c85e63256e1b75a839d4ce9 Signed-off-by: Matej Klotton --- .../traffic_scripts/dhcp/check_dhcp_request_ack.py | 132 +++++++++++++++++++++ 1 file changed, 132 insertions(+) create mode 100755 resources/traffic_scripts/dhcp/check_dhcp_request_ack.py (limited to 'resources/traffic_scripts/dhcp') diff --git a/resources/traffic_scripts/dhcp/check_dhcp_request_ack.py b/resources/traffic_scripts/dhcp/check_dhcp_request_ack.py new file mode 100755 index 0000000000..8a3839cda7 --- /dev/null +++ b/resources/traffic_scripts/dhcp/check_dhcp_request_ack.py @@ -0,0 +1,132 @@ +#!/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 a DHCP ACK message when DHCP REQUEST message is +received.""" + +import sys + +from scapy.layers.l2 import Ether +from scapy.layers.inet import IP, UDP +from scapy.layers.dhcp import BOOTP, DHCP + +from resources.libraries.python.PacketVerifier import RxQueue, TxQueue +from resources.libraries.python.TrafficScriptArg import TrafficScriptArg + + +def is_discover(pkt): + """If DHCP message type option is set to dhcp discover return True, + else return False. False is returned also if exception occurs.""" + dhcp_discover = 1 + try: + dhcp_options = pkt['BOOTP']['DHCP options'].options + message_type = filter(lambda x: x[0] == 'message-type', + dhcp_options) + message_type = message_type[0][1] + return message_type == dhcp_discover + except: + return False + + +def is_request(pkt): + """If DHCP message type option is DHCP REQUEST return True, + else return False. False is returned also if exception occurs.""" + dhcp_request = 3 + try: + dhcp_options = pkt['BOOTP']['DHCP options'].options + message_type = filter(lambda x: x[0] == 'message-type', + dhcp_options) + message_type = message_type[0][1] + return message_type == dhcp_request + except: + return False + + +def main(): + """Main function of the script file.""" + args = TrafficScriptArg(['server_mac', 'server_ip', 'client_ip', + 'client_mask', 'lease_time']) + + server_if = args.get_arg('rx_if') + server_mac = args.get_arg('server_mac') + server_ip = args.get_arg('server_ip') + + client_ip = args.get_arg('client_ip') + client_mask = args.get_arg('client_mask') + + lease_time = int(args.get_arg('lease_time')) + + rxq = RxQueue(server_if) + txq = TxQueue(server_if) + sent_packets = [] + + for _ in range(10): + dhcp_discover = rxq.recv(10) + if is_discover(dhcp_discover): + break + else: + raise RuntimeError("DHCP DISCOVER Rx error.") + + dhcp_offer = Ether(src=server_mac, dst=dhcp_discover.src) + dhcp_offer /= IP(src=server_ip, dst="255.255.255.255") + dhcp_offer /= UDP(sport=67, dport=68) + dhcp_offer /= BOOTP(op=2, + xid=dhcp_discover['BOOTP'].xid, + yiaddr=client_ip, + siaddr=server_ip, + chaddr=dhcp_discover['BOOTP'].chaddr) + dhcp_offer_options = [("message-type", "offer"), # Option 53 + ("subnet_mask", client_mask), # Option 1 + ("server_id", server_ip), # Option 54, dhcp server + ("lease_time", lease_time), # Option 51 + "end"] + dhcp_offer /= DHCP(options=dhcp_offer_options) + + txq.send(dhcp_offer) + sent_packets.append(dhcp_offer) + + max_other_pkts = 10 + for _ in range(0, max_other_pkts): + dhcp_request = rxq.recv(5, sent_packets) + if not dhcp_request: + raise RuntimeError("DHCP REQUEST Rx timeout.") + if is_request(dhcp_request): + break + else: + raise RuntimeError("Max RX packet limit reached.") + + # Send dhcp ack + dhcp_ack = Ether(src=server_mac, dst=dhcp_request.src) + dhcp_ack /= IP(src=server_ip, dst="255.255.255.255") + dhcp_ack /= UDP(sport=67, dport=68) + dhcp_ack /= BOOTP(op=2, + xid=dhcp_request['BOOTP'].xid, + yiaddr=client_ip, + siaddr=server_ip, + flags=dhcp_request['BOOTP'].flags, + chaddr=dhcp_request['BOOTP'].chaddr) + dhcp_ack_options = [("message-type", "ack"), # Option 53. 5: ACK, 6: NAK + ("subnet_mask", client_mask), # Option 1 + ("server_id", server_ip), # Option 54, dhcp server + ("lease_time", lease_time), # Option 51, + "end"] + dhcp_ack /= DHCP(options=dhcp_ack_options) + + txq.send(dhcp_ack) + sent_packets.append(dhcp_ack) + + sys.exit(0) + +if __name__ == "__main__": + main() -- cgit 1.2.3-korg