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WhoIsIAmSummaryFilter.py
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WhoIsIAmSummaryFilter.py
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#!/usr/bin/python
"""
This application prints a list of the top 20 Who-Is and I-Am requests by
packet count. It is useful when analyzing a large network looking for
device configuration problems related to device-address-binding. For example,
there may be a few devices that are consistently looking for a device that
isn't defined, or is on an unreachable network because of firewall rules.
This application accepts the same --source, --destination, and --host options
as the other filters, and accepts the debugging options of other BACpypes
applications.
"""
from collections import defaultdict
from bacpypes.debugging import bacpypes_debugging, ModuleLogger
from bacpypes.consolelogging import ArgumentParser
from bacpypes.pdu import Address
from bacpypes.analysis import trace, Tracer
from bacpypes.apdu import WhoIsRequest, IAmRequest
# some debugging
_debug = 0
_log = ModuleLogger(globals())
# globals
filterSource = None
filterDestination = None
filterHost = None
# dictionaries of requests
whoIsTraffic = defaultdict(int)
iAmTraffic = defaultdict(int)
#
# Match
#
@bacpypes_debugging
def Match(addr1, addr2):
"""Return true iff addr1 matches addr2."""
if _debug: Match._debug("Match %r %r", addr1, addr2)
if (addr2.addrType == Address.localBroadcastAddr):
# match any local station
return (addr1.addrType == Address.localStationAddr) or (addr1.addrType == Address.localBroadcastAddr)
elif (addr2.addrType == Address.localStationAddr):
# match a specific local station
return (addr1.addrType == Address.localStationAddr) and (addr1.addrAddr == addr2.addrAddr)
elif (addr2.addrType == Address.remoteBroadcastAddr):
# match any remote station or remote broadcast on a matching network
return ((addr1.addrType == Address.remoteStationAddr) or (addr1.addrType == Address.remoteBroadcastAddr)) \
and (addr1.addrNet == addr2.addrNet)
elif (addr2.addrType == Address.remoteStationAddr):
# match a specific remote station
return (addr1.addrType == Address.remoteStationAddr) and \
(addr1.addrNet == addr2.addrNet) and (addr1.addrAddr == addr2.addrAddr)
elif (addr2.addrType == Address.globalBroadcastAddr):
# match a global broadcast address
return (addr1.addrType == Address.globalBroadcastAddr)
else:
raise RuntimeError("invalid match combination")
#
# WhoIsIAmSummary
#
@bacpypes_debugging
class WhoIsIAmSummary(Tracer):
def __init__(self):
if _debug: WhoIsIAmSummary._debug("__init__")
Tracer.__init__(self, self.Filter)
def Filter(self, pkt):
if _debug: WhoIsIAmSummary._debug("Filter %r", pkt)
global requests
# apply the filters
if filterSource:
if not Match(pkt.pduSource, filterSource):
if _debug: WhoIsIAmSummary._debug(" - source filter fail")
return
if filterDestination:
if not Match(pkt.pduDestination, filterDestination):
if _debug: WhoIsIAmSummary._debug(" - destination filter fail")
return
if filterHost:
if (not Match(pkt.pduSource, filterHost)) and (not Match(pkt.pduDestination, filterHost)):
if _debug: WhoIsIAmSummary._debug(" - host filter fail")
return
# check for Who-Is
if isinstance(pkt, WhoIsRequest):
key = (pkt.pduSource, pkt.deviceInstanceRangeLowLimit, pkt.deviceInstanceRangeHighLimit)
whoIsTraffic[key] += 1
# check for I-Am
elif isinstance(pkt, IAmRequest):
key = (pkt.pduSource, pkt.iAmDeviceIdentifier[1])
iAmTraffic[key] += 1
#
# __main__
#
# parse the command line arguments
parser = ArgumentParser(description=__doc__)
parser.add_argument(
"-s", "--source", nargs='?', type=str,
help="source address",
)
parser.add_argument(
"-d", "--destination", nargs='?', type=str,
help="destination address",
)
parser.add_argument(
"--host", nargs='?', type=str,
help="source or destination",
)
parser.add_argument(
"pcap", nargs='+', type=str,
help="pcap file(s)",
)
args = parser.parse_args()
if _debug: _log.debug("initialization")
if _debug: _log.debug(" - args: %r", args)
# interpret the arguments
if args.source:
filterSource = Address(args.source)
if _debug: _log.debug(" - filterSource: %r", filterSource)
if args.destination:
filterDestination = Address(args.destination)
if _debug: _log.debug(" - filterDestination: %r", filterDestination)
if args.host:
filterHost = Address(args.host)
if _debug: _log.debug(" - filterHost: %r", filterHost)
# trace the file(s)
for fname in args.pcap:
trace(fname, [WhoIsIAmSummary])
# dump request counts
print("----- Top 20 Who-Is -----")
print("")
items = whoIsTraffic.items()
items.sort(key=lambda x: (x[1], x[0][0]), reverse=True)
for item in items[:20]:
print("%-20s %8s %8s %5d" % (item[0][0], item[0][1], item[0][2], item[1]))
print("")
print("----- Top 20 I-Am -----")
print("")
items = iAmTraffic.items()
items.sort(key=lambda x: (x[1], x[0][0]), reverse=True)
for item in items[:20]:
print("%-20s %8s %5d" % (item[0][0], item[0][1], item[1]))
print("")