mirror of
https://github.com/uhi22/pyPLC.git
synced 2024-11-20 01:13:58 +00:00
77 lines
3.1 KiB
Python
77 lines
3.1 KiB
Python
|
|
# pcap Converter
|
|
#
|
|
# This little helper tool reads a network trace (e.g. recorded with wireshark) and
|
|
# interprets the content of the EXI.V2GTP.TCP.IPv6 data.
|
|
#
|
|
# Preconditions:
|
|
# 1. You have a capture file with contains V2G traffic (pcap or pcapng file).
|
|
# 2. You installed the python library pyshark, according to https://github.com/KimiNewt/pyshark/
|
|
# pip install pyshark
|
|
# 3. You cloned and compiled the OpenV2Gx EXI decoder from https://github.com/uhi22/OpenV2Gx
|
|
#
|
|
# Limitations:
|
|
# - Only DIN is supported at the moment.
|
|
# - The script treats all V2G EXI messages as DIN messages. This means, the ApplHandshake messages at
|
|
# the begin of the charging session will lead to wrong or not decoded data.
|
|
# - The path where the script look for pcap files needs to be configured in the code.
|
|
#
|
|
# Possible improvements / Todos:
|
|
# - Show also the SLAC, NeigborDiscovery and SDP.
|
|
# - Add flexibility to also decode the ApplHandshake messages.
|
|
# - Add ISO support.
|
|
# - Configure the path where to look for pcap files via command line
|
|
#
|
|
|
|
import pyshark
|
|
import exiConnector
|
|
import os
|
|
|
|
# The path where the script will search for pcap files:
|
|
directory = '../temp'
|
|
|
|
|
|
def convertPcapToTxt(inputFileName):
|
|
cap = pyshark.FileCapture(inputFileName, display_filter="ipv6")
|
|
fileOut = open(inputFileName + '.decoded.txt', 'w')
|
|
print("# generated by pcapConverter.py", file=fileOut)
|
|
print("# https://github.com/uhi22/pyPLC", file=fileOut)
|
|
# Example how to access the data:
|
|
#print(cap)
|
|
#print(cap[0])
|
|
#print(cap[1])
|
|
#print(dir(cap[1]))
|
|
#print(cap[1].sniff_time) # readable time
|
|
#print(cap[1].sniff_timestamp) # epoch time
|
|
numberOfPackets=0
|
|
for packet in cap:
|
|
numberOfPackets+=1
|
|
#print(packet)
|
|
if 'TCP' in packet:
|
|
#print(packet.tcp.field_names)
|
|
if ('payload' in packet.tcp.field_names):
|
|
tcppayload = packet.tcp.payload # this gives a string of hex values, separated by ":", e.g. "01:fe:80:01"
|
|
s = tcppayload.replace(":", "") # remove colons
|
|
if (s[0:8]=="01fe8001"):
|
|
# it is a V2GTP header with EXI content
|
|
strExi = s[16:] # remove V2GTP header (8 bytes, means 16 hex characters)
|
|
sHeader = "Packet #" + str(numberOfPackets) + " [" + str(packet.sniff_time) + "] " + strExi + " means:"
|
|
pre = "DD" # decode DIN
|
|
decoded=exiConnector.exiDecode(strExi, pre)
|
|
print(sHeader)
|
|
print(decoded)
|
|
print(sHeader, file=fileOut)
|
|
print(decoded, file=fileOut)
|
|
fileOut.close()
|
|
|
|
|
|
# iterate over files in the directory
|
|
for filename in os.listdir(directory):
|
|
strFileNameWithPath = os.path.join(directory, filename)
|
|
# checking if it is a file
|
|
if os.path.isfile(strFileNameWithPath):
|
|
print(strFileNameWithPath)
|
|
# check the file extension:
|
|
if (strFileNameWithPath[-5:]==".pcap") or (strFileNameWithPath[-7:]==".pcapng"):
|
|
print("Will decode " + strFileNameWithPath)
|
|
convertPcapToTxt(strFileNameWithPath)
|