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61 lines
2.2 KiB
Markdown
61 lines
2.2 KiB
Markdown
# Trace command notes
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The `trace` command lists the data exchange by the proxmark3 and a tag or a reader in human readable form.
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With `trace list` a table is shown which gives timing information, the src of the data bytes, the transmitted/received bytes itself, a check if the CRC was correct and some decoding of the command.
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To get a more detailed explanation of the transmitted data for ISO14443A traces the output can be converted to a pcapng file to read it with [Wireshark](https://www.wireshark.org/).
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To do so
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* use `trace list 14a x`
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* copy the output (starting with the timestamp) into a textfile
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* run `text2pcap -t "%S." -l 264 -n <input-text-file> <output-pcapng-file>`
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* now open your pcapng file in Wireshark or read it with the CLI version `tshark`
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An example frame
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with `trace list 14a`:
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```
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19072 | 29536 | Rdr |93 70 88 04 cf ff bc 7f bb | ok | SELECT_UID
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```
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the same data with `tshark -r foo.pcapng -V -x`:
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```
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Frame 5: 13 bytes on wire (104 bits), 13 bytes captured (104 bits) on interface 0
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Interface id: 0 (unknown)
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Interface name: unknown
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Encapsulation type: ISO 14443 contactless smartcard standards (177)
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Arrival Time: Aug 17, 2019 23:17:00.000002606 CEST
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[Time shift for this packet: 0.000000000 seconds]
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Epoch Time: 1566076620.000002606 seconds
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[Time delta from previous captured frame: 0.000000840 seconds]
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[Time delta from previous displayed frame: 0.000000840 seconds]
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[Time since reference or first frame: 0.000001907 seconds]
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Frame Number: 5
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Frame Length: 13 bytes (104 bits)
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Capture Length: 13 bytes (104 bits)
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[Frame is marked: False]
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[Frame is ignored: False]
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[Protocols in frame: iso14443]
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ISO 14443
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Pseudo header
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Version: 0x00
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Event: Data transfer PCD -> PICC (0xfe)
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Length field: 9
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Message: Select
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SEL: 0x93
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NVB: 0x70
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CT: 0x88
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UID_CLn: 04cfff
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BCC: 0xbc
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CRC: 0xbb7f [correct]
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[CRC Status: Good]
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0000 00 fe 00 09 93 70 88 04 cf ff bc 7f bb .....p.......
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```
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If the Wireshark ISO14443a dissector is missing some commands or needs some other rework please [file a bug](https://bugs.wireshark.org/bugzilla/).
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