CSIT-341 Refactor DHCPv4 proxy test

[csit.git] / resources / traffic_scripts / dhcp / send_and_check_proxy_discover.py

diff --git a/resources/traffic_scripts/dhcp/send_and_check_proxy_discover.py b/resources/traffic_scripts/dhcp/send_and_check_proxy_discover.py
new file mode 100755 (executable)
index 0000000..d808971
--- /dev/null
+++ b/resources/traffic_scripts/dhcp/send_and_check_proxy_discover.py
@@ -0,0 +1,79 @@
+#!/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 DHCP DISCOVER packet
+ and check if is received on interface."""
+
+import sys
+
+from scapy.all import Ether
+from scapy.layers.inet import IP, UDP
+from scapy.layers.inet import UDP_SERVICES
+from scapy.layers.dhcp import DHCP, BOOTP
+
+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 main():
+    """Send DHCP DISCOVER packet."""
+
+    args = TrafficScriptArg(['tx_src_ip', 'tx_dst_ip'])
+
+    tx_if = args.get_arg('tx_if')
+    rx_if = args.get_arg('rx_if')
+
+    rxq = RxQueue(rx_if)
+    txq = TxQueue(tx_if)
+
+    tx_src_ip = args.get_arg('tx_src_ip')
+    tx_dst_ip = args.get_arg('tx_dst_ip')
+
+    sent_packets = []
+
+    dhcp_discover = Ether(dst="ff:ff:ff:ff:ff:ff") / \
+                    IP(src=tx_src_ip, dst=tx_dst_ip) / \
+                    UDP(sport=UDP_SERVICES.bootpc, dport=UDP_SERVICES.bootps) / \
+                    BOOTP(op=1,) / \
+                    DHCP(options=[("message-type", "discover"),
+                                  "end"])
+
+    sent_packets.append(dhcp_discover)
+    txq.send(dhcp_discover)
+
+    for _ in range(10):
+        dhcp_discover = rxq.recv(2)
+        if is_discover(dhcp_discover):
+            break
+    else:
+        raise RuntimeError("DHCP DISCOVER Rx timeout")
+
+    sys.exit(0)
+
+if __name__ == "__main__":
+    main()