1 files changed, 136 insertions, 0 deletions
diff --git a/GPL/traffic_scripts/send_icmp_wait_for_reply.py b/GPL/traffic_scripts/send_icmp_wait_for_reply.py
new file mode 100644
index 0000000000..78554634af
--- /dev/null
+++ b/GPL/traffic_scripts/send_icmp_wait_for_reply.py
@@ -0,0 +1,136 @@
+#!/usr/bin/env python3
+
+# Copyright (c) 2020 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 an IP ICMPv4 or ICMPv6."""
+
+import sys
+import ipaddress
+
+from scapy.layers.inet import ICMP, IP
+from scapy.layers.inet6 import IPv6, ICMPv6EchoRequest, ICMPv6EchoReply,\
+    ICMPv6ND_NS
+from scapy.layers.l2 import Ether
+from scapy.packet import Raw
+
+from .PacketVerifier import RxQueue, TxQueue
+from .TrafficScriptArg import TrafficScriptArg
+
+
+def valid_ipv4(ip):
+    """Check if IP address has the correct IPv4 address format.
+
+    :param ip: IP address.
+    :type ip: str
+    :return: True in case of correct IPv4 address format,
+             otherwise return False.
+    :rtype: bool
+    """
+    try:
+        ipaddress.IPv4Address(ip)
+        return True
+    except (AttributeError, ipaddress.AddressValueError):
+        return False
+
+
+def valid_ipv6(ip):
+    """Check if IP address has the correct IPv6 address format.
+
+    :param ip: IP address.
+    :type ip: str
+    :return: True in case of correct IPv6 address format,
+             otherwise return False.
+    :rtype: bool
+    """
+    try:
+        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(
+        [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)
+    txq = TxQueue(tx_if)
+    sent_packets = []
+
+    # Create empty ip ICMP packet
+    if valid_ipv4(src_ip) and valid_ipv4(dst_ip):
+        ip_layer = IP
+        icmp_req = ICMP
+        icmp_resp = ICMP
+        icmp_type = 0  # echo-reply
+    elif valid_ipv6(src_ip) and valid_ipv6(dst_ip):
+        ip_layer = IP
+        icmp_req = ICMPv6EchoRequest
+        icmp_resp = ICMPv6EchoReply
+        icmp_type = 0  # Echo Reply
+    else:
+        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)
+
+    for _ in range(1000):
+        while True:
+            icmp_reply = rxq.recv(wait_step, ignore=sent_packets)
+            if icmp_reply is None:
+                timeout -= wait_step
+                if timeout < 0:
+                    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
+                continue
+            else:
+                # otherwise process the current packet
+                break
+
+        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(u"Max packet count limit reached")
+
+    print(u"ICMP echo reply received.")
+
+    sys.exit(0)
+
+
+if __name__ == u"__main__":
+    main()