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#!/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 DHCPv6 proxy packets."""
from scapy.layers.dhcp6 import *
from scapy.layers.inet6 import IPv6, UDP, UDP_SERVICES
from resources.libraries.python.PacketVerifier import RxQueue, TxQueue
from resources.libraries.python.TrafficScriptArg import TrafficScriptArg
def _check_udp_checksum(pkt):
"""Check udp checksum in ip packet.
Return true if checksum is correct."""
new = pkt.__class__(str(pkt))
del new['UDP'].chksum
new = new.__class__(str(new))
return new['UDP'].chksum == pkt['UDP'].chksum
def dhcpv6_solicit(tx_if, rx_if, dhcp_multicast_ip, link_local_ip, proxy_ip,
server_ip, server_mac, client_duid, client_mac):
"""Send and check DHCPv6 SOLICIT proxy packet.
:param tx_if: Client interface.
:param rx_if: DHCPv6 server interface.
:param dhcp_multicast_ip: Servers and relay agents multicast address.
:param link_local_ip: Client link-local address.
:param proxy_ip: IP address of DHCPv6 proxy server.
:param server_ip: IP address of DHCPv6 server.
:param server_mac: MAC address of DHCPv6 server.
:param client_duid: Client DHCP Unique Identifier.
:param client_mac: Client MAC address.
:type tx_if: str
:type rx_if: str
:type dhcp_multicast_ip: str
:type link_local_ip: str
:type proxy_ip: str
:type server_ip: str
:type server_mac: str
:type client_duid: str
:type client_mac: str
:return interface_id: ID of proxy interface.
:rtype interface_id: str
"""
rxq = RxQueue(rx_if)
txq = TxQueue(tx_if)
sent_packets = []
dhcp6_solicit_pkt = Ether(src=client_mac, dst="33:33:00:01:00:02") / \
IPv6(src=link_local_ip, dst=dhcp_multicast_ip) / \
UDP(sport=UDP_SERVICES.dhcpv6_client,
dport=UDP_SERVICES.dhcpv6_server) / \
DHCP6_Solicit() / \
DHCP6OptClientId(duid=client_duid)
sent_packets.append(dhcp6_solicit_pkt)
txq.send(dhcp6_solicit_pkt)
ether = rxq.recv(2)
if ether is None:
raise RuntimeError('DHCPv6 SOLICIT timeout')
if ether.dst != server_mac:
raise RuntimeError("Destination MAC address error!")
print "Destination MAC address: OK."
if ether['IPv6'].src != proxy_ip:
raise RuntimeError("Source IP address error!")
print "Source IP address: OK."
if ether['IPv6'].dst != server_ip:
raise RuntimeError("Destination IP address error!")
print "Destination IP address: OK."
if ether['IPv6']['UDP']\
['DHCPv6 Relay Forward Message (Relay Agent/Server Message)']:
print "Relay Agent/Server Message: OK."
else:
raise RuntimeError("Relay Agent/Server Message error.")
if ether['IPv6']['UDP']\
['DHCPv6 Relay Forward Message (Relay Agent/Server Message)']\
.linkaddr != proxy_ip:
raise RuntimeError("Proxy IP address error!")
print "Proxy IP address: OK."
try:
interface_id = ether['IPv6']['UDP']\
['DHCPv6 Relay Forward Message (Relay Agent/Server Message)']\
['Unknown DHCPv6 OPtion']['DHCP6 Interface-Id Option'].ifaceid
except Exception:
raise RuntimeError("DHCP6 Interface-Id error!")
return interface_id
def dhcpv6_advertise(rx_if, tx_if, link_local_ip, proxy_ip,
server_ip, server_mac, proxy_to_server_mac, interface_id):
"""Send and check DHCPv6 ADVERTISE proxy packet.
:param rx_if: DHCPv6 server interface.
:param tx_if: Client interface.
:param link_local_ip: Client link-local address.
:param proxy_ip: IP address of DHCPv6 proxy server.
:param server_ip: IP address of DHCPv6 server.
:param server_mac: MAC address of DHCPv6 server.
:param proxy_to_server_mac: MAC address of DHCPv6 proxy interface.
:param interface_id: ID of proxy interface.
:type rx_if: str
:type tx_if: str
:type link_local_ip: str
:type proxy_ip: str
:type server_ip: str
:type server_mac: str
:type proxy_to_server_mac: str
:type interface_id: str
"""
rxq = RxQueue(rx_if)
txq = TxQueue(tx_if)
sent_packets = []
dhcp6_advertise_pkt = Ether(src=server_mac, dst=proxy_to_server_mac) / \
IPv6(src=server_ip, dst=proxy_ip) / \
UDP(sport=UDP_SERVICES.dhcpv6_server,
dport=UDP_SERVICES.dhcpv6_client) / \
DHCP6_RelayReply(peeraddr=link_local_ip,
linkaddr=proxy_ip) / \
DHCP6OptIfaceId(ifaceid=interface_id) / \
DHCP6OptRelayMsg() / \
DHCP6_Advertise()
sent_packets.append(dhcp6_advertise_pkt)
txq.send(dhcp6_advertise_pkt)
ether = rxq.recv(2)
if ether is None:
raise RuntimeError('DHCPv6 ADVERTISE timeout')
if ether['IPv6'].src != proxy_ip:
raise RuntimeError("Source IP address error!")
print "Source IP address: OK."
if not _check_udp_checksum(ether['IPv6']):
raise RuntimeError("Checksum error!")
print "Checksum: OK."
if ether['IPv6']['UDP']['Raw'].load != interface_id:
raise RuntimeError("Interface ID error!")
print "Interface ID: OK."
def dhcpv6_request(tx_if, rx_if, dhcp_multicast_ip, link_local_ip, proxy_ip,
server_ip, client_duid, client_mac):
"""Send and check DHCPv6 REQUEST proxy packet.
:param tx_if: Client interface.
:param rx_if: DHCPv6 server interface.
:param dhcp_multicast_ip: Servers and relay agents multicast address.
:param link_local_ip: Client link-local address.
:param proxy_ip: IP address of DHCPv6 proxy server.
:param server_ip: IP address of DHCPv6 server.
:param client_duid: Client DHCP Unique Identifier.
:param client_mac: Client MAC address.
:type tx_if: str
:type rx_if: str
:type dhcp_multicast_ip: str
:type link_local_ip: str
:type proxy_ip: str
:type server_ip: str
:type client_duid: str
:type client_mac: str
"""
rxq = RxQueue(rx_if)
txq = TxQueue(tx_if)
sent_packets = []
dhcp6_request_pkt = Ether(src=client_mac, dst="33:33:00:01:00:02") / \
IPv6(src=link_local_ip, dst=dhcp_multicast_ip) / \
UDP(sport=UDP_SERVICES.dhcpv6_client,
dport=UDP_SERVICES.dhcpv6_server) / \
DHCP6_Request() / \
DHCP6OptClientId(duid=client_duid)
sent_packets.append(dhcp6_request_pkt)
txq.send(dhcp6_request_pkt)
ether = rxq.recv(2)
if ether is None:
raise RuntimeError('DHCPv6 REQUEST timeout')
if ether['IPv6'].src != proxy_ip:
raise RuntimeError("Source IP address error!")
print "Source IP address: OK."
if ether['IPv6'].dst != server_ip:
raise RuntimeError("Destination IP address error!")
print "Destination IP address: OK."
if ether['IPv6']['UDP']\
['DHCPv6 Relay Forward Message (Relay Agent/Server Message)']:
print "Relay Agent/Server Message: OK."
else:
raise RuntimeError("Relay Agent/Server Message error.")
if ether['IPv6']['UDP']\
['DHCPv6 Relay Forward Message (Relay Agent/Server Message)']\
.linkaddr != proxy_ip:
raise RuntimeError("Proxy IP address error!")
print "Proxy IP address: OK."
def dhcpv6_reply(rx_if, tx_if, link_local_ip, proxy_ip, server_ip, server_mac,
interface_id):
"""Send and check DHCPv6 REPLY proxy packet.
:param rx_if: DHCPv6 server interface.
:param tx_if: Client interface.
:param link_local_ip: Client link-local address.
:param proxy_ip: IP address of DHCPv6 proxy server.
:param server_ip: IP address of DHCPv6 server.
:param server_mac: MAC address of DHCPv6 server.
:param interface_id: ID of proxy interface.
:type rx_if: str
:type tx_if: str
:type link_local_ip: str
:type proxy_ip: str
:type server_ip: str
:type server_mac: str
:type interface_id: str
"""
rxq = RxQueue(rx_if)
txq = TxQueue(tx_if)
sent_packets = []
dhcp_reply_pkt = Ether(src=server_mac) / \
IPv6(src=server_ip, dst=proxy_ip) / \
UDP(sport=UDP_SERVICES.dhcpv6_server,
dport=UDP_SERVICES.dhcpv6_client) / \
DHCP6_RelayReply(peeraddr=link_local_ip,
linkaddr=proxy_ip) / \
DHCP6OptIfaceId(ifaceid=interface_id) / \
DHCP6OptRelayMsg() / \
DHCP6_Reply()
sent_packets.append(dhcp_reply_pkt)
txq.send(dhcp_reply_pkt)
ether = rxq.recv(2)
if ether is None:
raise RuntimeError('DHCPv6 REPLY timeout')
if ether['IPv6'].src != proxy_ip:
raise RuntimeError("Source IP address error!")
print "Source IP address: OK."
if not _check_udp_checksum(ether['IPv6']):
raise RuntimeError("Checksum error!")
print "Checksum: OK."
if ether['IPv6']['UDP']['Raw'].load != interface_id:
raise RuntimeError("Interface ID error!")
print "Interface ID: OK."
def main():
"""Send DHCPv6 proxy messages."""
args = TrafficScriptArg(['tx_src_ip', 'tx_dst_ip', 'proxy_ip', 'proxy_mac',
'server_ip', 'client_mac', 'server_mac',
'proxy_to_server_mac'])
client_if = args.get_arg('tx_if')
server_if = args.get_arg('rx_if')
proxy_ip = args.get_arg('proxy_ip')
proxy_mac = args.get_arg('proxy_mac')
proxy_to_server_mac = args.get_arg('proxy_to_server_mac')
server_ip = args.get_arg('server_ip')
client_mac = args.get_arg('client_mac')
server_mac = args.get_arg('server_mac')
link_local_ip = "fe80::1"
dhcp_multicast_ip = "ff02::1:2"
client_duid = str(random.randint(0, 9999))
# SOLICIT
interface_id = dhcpv6_solicit(client_if, server_if, dhcp_multicast_ip,
link_local_ip, proxy_ip, server_ip,
server_mac, client_duid, client_mac)
# ADVERTISE
dhcpv6_advertise(client_if, server_if, link_local_ip, proxy_ip,
server_ip, server_mac, proxy_to_server_mac, interface_id)
# REQUEST
dhcpv6_request(client_if, server_if, dhcp_multicast_ip, link_local_ip,
proxy_ip, server_ip, client_duid, client_mac)
# REPLY
dhcpv6_reply(client_if, server_if, link_local_ip, proxy_ip, server_ip,
server_mac, interface_id)
sys.exit(0)
if __name__ == "__main__":
main()
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