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WhoIsIAmDeviceFilter.py
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WhoIsIAmDeviceFilter.py
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#!/usr/bin/python
"""
Given a device identifier and a list of PCAP files, this application prints
a summary line of Who-Is packets such that the device should respond, and
the I-Am packets that are sent by the device. This is useful for repeated
attempts to 'bind' where it fails, or where more than one device responds to
the request (which is bad) or the same device responds but it comes from
changing source addresses (which is really bad).
This application accepts the same --source, --destination, and --host options
as the other filters, and accepts the debugging options of other BACpypes
applications.
"""
from bacpypes.debugging import bacpypes_debugging, ModuleLogger
from bacpypes.consolelogging import ArgumentParser
from bacpypes.pdu import Address
from bacpypes.analysis import trace, strftimestamp, Tracer
from bacpypes.apdu import WhoIsRequest, IAmRequest
# some debugging
_debug = 0
_log = ModuleLogger(globals())
# globals
filterSource = None
filterDestination = None
filterHost = None
filterDevice = None
#
# 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")
#
# WhoIsIAmDevice
#
@bacpypes_debugging
class WhoIsIAmDevice(Tracer):
def __init__(self):
if _debug: WhoIsIAmDevice._debug("__init__")
Tracer.__init__(self, self.Filter)
def Filter(self, pkt):
if _debug: WhoIsIAmDevice._debug("Filter %r", pkt)
global requests
# apply the filters
if filterSource:
if not Match(pkt.pduSource, filterSource):
if _debug: WhoIsIAmDevice._debug(" - source filter fail")
return
if filterDestination:
if not Match(pkt.pduDestination, filterDestination):
if _debug: WhoIsIAmDevice._debug(" - destination filter fail")
return
if filterHost:
if (not Match(pkt.pduSource, filterHost)) and (not Match(pkt.pduDestination, filterHost)):
if _debug: WhoIsIAmDevice._debug(" - host filter fail")
return
# check for Who-Is
if isinstance(pkt, WhoIsRequest):
match = False
if (pkt.deviceInstanceRangeLowLimit is None) or (pkt.deviceInstanceRangeHighLimit is None):
match = True
elif (pkt.deviceInstanceRangeLowLimit >= filterDevice) and (pkt.deviceInstanceRangeHighLimit <= filterDevice):
match = True
if match:
print("[%d] %s WhoIs %-20s %-20s %8s %8s" % (
pkt._index + 1, strftimestamp(pkt._timestamp),
pkt.pduSource, pkt.pduDestination,
pkt.deviceInstanceRangeLowLimit, pkt.deviceInstanceRangeHighLimit,
))
# check for I-Am
elif isinstance(pkt, IAmRequest):
if (pkt.iAmDeviceIdentifier[1] == filterDevice):
print("[%d] %s IAm %-20s %-20s" % (
pkt._index + 1, strftimestamp(pkt._timestamp),
pkt.pduSource, pkt.pduDestination,
))
#
# __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(
"device", nargs=1, type=int,
help="device identifier",
)
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)
# which device instance to look for
filterDevice = args.device[0]
if _debug: _log.debug(" - filterDevice: %r", filterDevice)
# trace the file(s)
for fname in args.pcap:
trace(fname, [WhoIsIAmDevice])