Tshark: The capture session could not be initiated on interface 'usbmon2' (Can't open USB bus file /sys/kernel/debug/usb/usbmon/2t: Permission denied). Start the capture $ tshark -i usbmon2 -w trace1.pcap In my case the device I want to study is on the bus 002 so I will use usbmon2. In my case I have 2 USB buses labeled usbmon1 and usbmon2.īefore capturing the USB frames you need to know on which USB bus is connected your device.īus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hubīus 002 Device 004: ID 08e6:3437 Gemplus GemPC Twin SmartCard Readerīus 002 Device 002: ID 80ee:0021 VirtualBox USB Tabletīus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Tshark (a command line tool) should now be able to capture on usbmon interfaces. You first need to load the usbmon kernel module. Wireshark is even able to display the CCID commands inside the USB packets.Ī documentation is available at USB capture setup and also at Capturing USB data through Wireshark. Wireshark is mainly used for analyzing network packets but it is also possible to display USB packets. Since some time, it is possible to use the wonderful Wireshark program to display and analyze USB frames. Since I do not have the budget to buy a hardware USB monitor I will use the software solution. Sometimes you need to know exactly what is happening at the USB level.
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