1#!/usr/bin/env python3 2# 3# SPDX-License-Identifier: BSD-2-Clause 4# 5# Copyright (c) 2021 Rubicon Communications, LLC (Netgate). 6# 7# Redistribution and use in source and binary forms, with or without 8# modification, are permitted provided that the following conditions 9# are met: 10# 1. Redistributions of source code must retain the above copyright 11# notice, this list of conditions and the following disclaimer. 12# 2. Redistributions in binary form must reproduce the above copyright 13# notice, this list of conditions and the following disclaimer in the 14# documentation and/or other materials provided with the distribution. 15# 16# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26# SUCH DAMAGE. 27 28import argparse 29import logging 30logging.getLogger("scapy").setLevel(logging.CRITICAL) 31import scapy.all as sp 32import sys 33import os 34curdir = os.path.dirname(os.path.realpath(__file__)) 35netpfil_common = curdir + "/../netpfil/common" 36sys.path.append(netpfil_common) 37from sniffer import Sniffer 38 39def check_pcp(args, packet): 40 vlan = packet.getlayer(sp.Dot1Q) 41 42 if vlan is None: 43 return False 44 45 if not packet.getlayer(sp.BOOTP): 46 return False 47 48 if vlan.prio == int(args.expect_pcp[0]): 49 return True 50 51 return False 52 53def main(): 54 parser = argparse.ArgumentParser("pcp.py", 55 description="PCP test tool") 56 parser.add_argument('--recvif', nargs=1, 57 required=True, 58 help='The interface where to look for packets to check') 59 parser.add_argument('--expect-pcp', nargs=1, 60 help='The expected PCP value on VLAN packets') 61 62 args = parser.parse_args() 63 64 sniffer = Sniffer(args, check_pcp, args.recvif[0], timeout=20) 65 66 sniffer.join() 67 68 if sniffer.correctPackets: 69 sys.exit(0) 70 71 sys.exit(1) 72 73if __name__ == '__main__': 74 main() 75