start_trace.sh

capture script - Daniel Clemmensen, 02/24/2019 10:02 am

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#! /bin/bash
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# Copyright (c) 2019 Dan Clemmensen, licensed to you under GPL v3.
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# 
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# find the correct USB serial port device and run tshark on its usbmon,
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# to capture the interactions into cap.pcap.
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# this script take one parameter: the device id (as 4 hex digits).
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# for example one Prolific device has an ID of 067b
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# We use this apporach because the bus and device numbers can
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# change when you plug and unplug the USB connector.
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#
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# must run as root
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# 
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devstr=$(lsusb -d $1: | tr -d ":")
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words=( $devstr )
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bus=${words[1]#0}
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dev=${words[3]#0}
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bus=$(($bus - 0))
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echo " Starting capture on USB$bus, device $dev"
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tshark - i usbmon$bus -w cap.pcap
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