2023-04-17 21:26:58 +00:00
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# pcap Converter
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#
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# This little helper tool read a network trace (e.g. recorded with wireshark) and
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# interprets the content of the EXI.V2GTP.TCP.IPv6 data.
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#
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# Preconditions:
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# 1. You have a capture file with contains V2G traffic (pcap or pcapng file).
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# 2. You installed the python library pyshark, according to https://github.com/KimiNewt/pyshark/
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# pip install pyshark
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# 3. You cloned and compiled the OpenV2Gx EXI decoder from https://github.com/uhi22/OpenV2Gx
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import pyshark
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import exiConnector
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2023-04-17 22:28:32 +00:00
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import os
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2023-04-17 21:26:58 +00:00
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2023-04-17 22:28:32 +00:00
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def convertPcapToTxt(inputFileName):
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cap = pyshark.FileCapture(inputFileName, display_filter="ipv6")
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fileOut = open(inputFileName + '.decoded.txt', 'w')
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#print(cap)
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#print(cap[0])
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#print(cap[1])
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#print(dir(cap[1]))
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#print(cap[1].sniff_time) # readable time
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#print(cap[1].sniff_timestamp) # epoch time
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numberOfPackets=0
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for packet in cap:
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numberOfPackets+=1
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#print(packet)
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if 'TCP' in packet:
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#print(packet.tcp.field_names)
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if ('payload' in packet.tcp.field_names):
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tcppayload = packet.tcp.payload # this gives a string of hex values, separated by ":", e.g. "01:fe:80:01"
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s = tcppayload.replace(":", "") # remove colons
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if (s[0:8]=="01fe8001"):
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# it is a V2GTP header with EXI content
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strExi = s[16:] # remove V2GTP header (8 bytes, means 16 hex characters)
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sHeader = "Packet #" + str(numberOfPackets) + " [" + str(packet.sniff_time) + "] " + strExi + " means:"
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pre = "DD" # decode DIN
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decoded=exiConnector.exiDecode(strExi, pre)
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print(sHeader)
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print(decoded)
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print(sHeader, file=fileOut)
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print(decoded, file=fileOut)
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fileOut.close()
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# assign directory
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directory = '../temp'
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# iterate over files in
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# that directory
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for filename in os.listdir(directory):
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f = os.path.join(directory, filename)
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# checking if it is a file
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if os.path.isfile(f):
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print(f)
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if (f[-5:]==".pcap") or (f[-7:]==".pcapng"):
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strFileNameWithPath = f
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print("Will decode " + strFileNameWithPath)
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convertPcapToTxt(strFileNameWithPath)
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