dump_traffic.py

#!/usr/bin/python

"""
Utility application that reads in the hex dump traffic from the BMR application
and decodes it.

    $ python dump_traffic.py config.json dump.txt
"""

import sys
import json

from bacpypes.debugging import xtob
from bacpypes.pdu import Address
from bacpypes.analysis import decode_packet

# humph
null_address = Address("0x000000000000")

# read in configuration
with open(sys.argv[1]) as bmr_config_file:
    bmr_config = json.load(bmr_config_file)
inside_address = Address(bmr_config["inside"]["_deviceAddress"])
outside_address = Address(bmr_config["outside"]["_deviceAddress"])

# read in the file, split into lines
with open(sys.argv[2]) as infile:
    lines = infile.readlines()

# strip off eol, split tabs to fields
lines = [line[:-1].split("\t") for line in lines]

# dump out the header and the decoded packet
for indx, line in enumerate(lines):
    timestamp, stack, direction, source, destination, data = line

    pkt = decode_packet(b"\0" * 14 + xtob(data))
    if not pkt:
        pkt_type = "unnable to decode"
    else:
        pkt_type = pkt.__class__.__name__

    if pkt.pduSource == null_address:
        if direction == ">>>":
            pkt.pduSource = Address(source)
        elif direction == "<<<":
            if stack == "inside":
                pkt.pduSource = inside_address
            elif stack == "outside":
                pkt.pduSource = outside_address

    if pkt.pduDestination == null_address:
        pkt.pduDestination = Address(destination)

    print(f"{indx+1}. {stack} {direction} {pkt_type}")
    if pkt:
        print("")
        pkt.debug_contents()
    print("")