#!/usr/bin/env python3 import osimport signalfrom string import Templateimport subprocessimport timefrom TdcPlugin import TdcPlugin from tdc_config import * try:    from scapy.all import *except ImportError:    print("Unable to import the scapy python module.")    print("\nIf not already installed, you may do so with:")    print("\t\tpip3 install scapy==2.4.2")    exit(1) class SubPlugin(TdcPlugin):    def __init__(self):        self.sub_class = 'scapy/SubPlugin'        super().__init__()     def post_execute(self):        if 'scapy' not in self.args.caseinfo:            if self.args.verbose:                print('{}.post_execute: no scapy info in test case'.format(self.sub_class))            return         # Check for required fields        lscapyinfo = self.args.caseinfo['scapy']        if type(lscapyinfo) != list:            lscapyinfo = [ lscapyinfo, ]         for scapyinfo in lscapyinfo:            scapy_keys = ['iface', 'count', 'packet']            missing_keys = []            keyfail = False            for k in scapy_keys:                if k not in scapyinfo:                    keyfail = True                    missing_keys.append(k)            if keyfail:                print('{}: Scapy block present in the test, but is missing info:'                    .format(self.sub_class))                print('{}'.format(missing_keys))             pkt = eval(scapyinfo['packet'])            if '$' in scapyinfo['iface']:                tpl = Template(scapyinfo['iface'])                scapyinfo['iface'] = tpl.safe_substitute(NAMES)            for count in range(scapyinfo['count']):                sendp(pkt, iface=scapyinfo['iface'])