mirror of
https://github.com/uhi22/pyPLC.git
synced 2024-09-11 00:38:29 +00:00
196 lines
9.8 KiB
Python
196 lines
9.8 KiB
Python
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# pcap Converter
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#
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# This little helper tool reads 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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#
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# Limitations:
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# - Only DIN is supported at the moment.
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# - The script treats all V2G EXI messages as DIN messages. This means, the ApplHandshake messages at
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# the begin of the charging session will lead to wrong or not decoded data.
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# - The path where the script look for pcap files needs to be configured in the code.
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#
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# Possible improvements / Todos:
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# - Show also the SLAC, NeigborDiscovery and SDP.
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# - Add flexibility to also decode the ApplHandshake messages.
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# - Add ISO support.
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# - Configure the path where to look for pcap files via command line
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#
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import pyshark
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import exiConnector
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import os
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from helpers import combineValueAndMultiplier
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import json
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# The path where the script will search for pcap files:
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directory = 'local/pcaps_to_convert'
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# stop the evaluation after this number of packets. Set to zero to have no limit.
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nLimitNumberOfPackets = -1
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def getManufacturerFromMAC(strMAC):
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# Examples based on https://macvendors.com/, and https://www.ipchecktool.com/tool/macfinder and own experience
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if (strMAC[0:5]=="ec:a2"):
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return "Kempower"
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if (strMAC[0:8]=="dc:44:27"):
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return "Tesla"
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if (strMAC[0:8]=="ce:25:1a"):
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return "Alpitronic"
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if (strMAC[0:8]=="1a:a9:8e"):
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return "Alpitronic"
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if (strMAC[0:8]=="e8:eb:1b"):
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return "Microchip (maybe ABB)"
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if (strMAC[0:8]=="68:27:19"):
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return "Microchip (maybe ABB)"
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if (strMAC[0:8]=="80:1f:12"):
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return "Microchip (maybe Compleo)"
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if (strMAC[0:5]=="18:d7"):
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return "(maybe Siemens)"
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return "(unknown vendor)"
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# Examples of the decoder result:
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#"EVSEPresentVoltage.Multiplier": "0",
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#"EVSEPresentVoltage.Value": "318",
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#"EVSEPresentVoltage.Unit": "V",
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#"DC_EVStatus.EVRESSSOC": "53",
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def convertPcapToTxt(inputFileName):
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global nLimitNumberOfPackets
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global directory
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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("# generated by pcapConverter.py", file=fileOut)
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print("# https://github.com/uhi22/pyPLC", file=fileOut)
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fileOutValues = open(inputFileName + '.values.txt', 'w')
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print("# generated by pcapConverter.py", file=fileOutValues)
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print("# https://github.com/uhi22/pyPLC", file=fileOutValues)
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fileOutStatistics = open(directory + '/pcap_statistics.txt', 'a')
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print("# statistics for " + inputFileName, file=fileOutStatistics)
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# Example how to access the data:
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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(dir(cap[1].eth))
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#print(cap[1].eth.src) # the source MAC address
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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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t1CableCheckBegin = 0
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t2PreChargeBegin = 0
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t3CurrentDemandBegin = 0
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numberOfPackets=0
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decodeAlsoAsApplHandshake=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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if (decodeAlsoAsApplHandshake>0): # if it may be applHandShake, caused by the previous message, we decode also this.
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print("Alternative decoding as applHandshake", file=fileOut)
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decodeAlsoAsApplHandshake-=1
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decoded=exiConnector.exiDecode(strExi, "DH")
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print(decoded, file=fileOut)
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if (decoded.find("error-")>0): # a decoding error usually points to wrong protocol, so most likely it is appHandShake.
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print("maybe this is no DIN. Trying to decode as applHandshake", file=fileOut)
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decodeAlsoAsApplHandshake=1
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decoded=exiConnector.exiDecode(strExi, "DH")
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print(decoded, file=fileOut)
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if (decoded.find("SessionSetupReq")>0):
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if ((t1CableCheckBegin>0) and (t2PreChargeBegin>t1CableCheckBegin) and (t3CurrentDemandBegin>t2PreChargeBegin)):
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print("charger MAC " + chargerMAC + " " + getManufacturerFromMAC(chargerMAC))
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timeForCableCheck = t2PreChargeBegin - t1CableCheckBegin
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timeForPreCharge = t3CurrentDemandBegin - t2PreChargeBegin
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print("timeForCableCheck= " + ("%.3f" % timeForCableCheck))
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print("timeForPreCharge= " + ("%.3f" % timeForPreCharge))
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print(chargerMAC + ";" + getManufacturerFromMAC(chargerMAC) + ";" + \
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"timeForCableCheck;" + ("%.3f" % timeForCableCheck) + ";" + \
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"timeForPreCharge; " + ("%.3f" % timeForPreCharge), file=fileOutStatistics)
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t1CableCheckBegin = 0
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t2PreChargeBegin = 0
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t3CurrentDemandBegin = 0
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if (decoded.find("CableCheckReq")>0) and (t1CableCheckBegin==0):
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t1CableCheckBegin = float(packet.sniff_timestamp)
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chargerMAC = str(packet.eth.dst)
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if (decoded.find("PreChargeReq")>0) and (t2PreChargeBegin==0):
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t2PreChargeBegin = float(packet.sniff_timestamp)
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if (decoded.find("CurrentDemandReq")>0) and (t3CurrentDemandBegin==0):
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t3CurrentDemandBegin = float(packet.sniff_timestamp)
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try:
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jsondict = json.loads(decoded)
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try:
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u = combineValueAndMultiplier(jsondict["EVSEPresentVoltage.Value"], jsondict["EVSEPresentVoltage.Multiplier"])
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print("[" + str(packet.sniff_time) + "] EVSEPresentVoltage=" + str(u), file=fileOutValues)
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i = combineValueAndMultiplier(jsondict["EVSEPresentCurrent.Value"], jsondict["EVSEPresentCurrent.Multiplier"])
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print("[" + str(packet.sniff_time) + "] EVSEPresentCurrent=" + str(i), file=fileOutValues)
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except:
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pass
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try:
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u = combineValueAndMultiplier(jsondict["EVTargetVoltage.Value"], jsondict["EVTargetVoltage.Multiplier"])
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print("[" + str(packet.sniff_time) + "] EVTargetVoltage=" + str(u), file=fileOutValues)
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i = combineValueAndMultiplier(jsondict["EVTargetCurrent.Value"], jsondict["EVTargetCurrent.Multiplier"])
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print("[" + str(packet.sniff_time) + "] EVTargetCurrent=" + str(i), file=fileOutValues)
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except:
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pass
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try:
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soc = jsondict["DC_EVStatus.EVRESSSOC"]
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print("[" + str(packet.sniff_time) + "] EVRESSSOC=" + str(soc), file=fileOutValues)
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except:
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pass
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except:
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pass
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if ((numberOfPackets % 100)==0):
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print(str(numberOfPackets) + " packets")
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if ((nLimitNumberOfPackets>0) and (numberOfPackets>=nLimitNumberOfPackets)):
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break
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# Statistics of the timing:
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#print("t1CableCheckBegin " + str(t1CableCheckBegin))
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#print("t2PreChargeBegin " + str(t2PreChargeBegin))
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#print("t3CurrentDemandBegin " + str(t3CurrentDemandBegin))
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if ((t1CableCheckBegin>0) and (t2PreChargeBegin>t1CableCheckBegin) and (t3CurrentDemandBegin>t2PreChargeBegin)):
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print("charger MAC " + chargerMAC + " " + getManufacturerFromMAC(chargerMAC))
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timeForCableCheck = t2PreChargeBegin - t1CableCheckBegin
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timeForPreCharge = t3CurrentDemandBegin - t2PreChargeBegin
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print("timeForCableCheck= " + ("%.3f" % timeForCableCheck))
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print("timeForPreCharge= " + ("%.3f" % timeForPreCharge))
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print(chargerMAC + ";" + getManufacturerFromMAC(chargerMAC) + ";" + \
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"timeForCableCheck;" + ("%.3f" % timeForCableCheck) + ";" + \
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"timeForPreCharge; " + ("%.3f" % timeForPreCharge), file=fileOutStatistics)
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fileOutStatistics.close()
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fileOut.close()
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fileOutValues.close()
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# iterate over files in the directory
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for filename in os.listdir(directory):
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strFileNameWithPath = os.path.join(directory, filename)
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# checking if it is a file
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if os.path.isfile(strFileNameWithPath):
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print(strFileNameWithPath)
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# check the file extension:
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if (strFileNameWithPath[-5:]==".pcap") or (strFileNameWithPath[-7:]==".pcapng"):
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print("Will decode " + strFileNameWithPath)
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convertPcapToTxt(strFileNameWithPath)
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