freebsd man page for usbdump

USBDUMP(8)						    BSD System Manager's Manual 						USBDUMP(8)

NAME
     usbdump -- dump traffic on USB host controller

SYNOPSIS
     usbdump [-i ifname] [-r file] [-s snaplen] [-v] [-w file] [-f filter] [-b file] [-h]

DESCRIPTION
     The usbdump utility provides a way to dump USB packets on host controllers.

     The following options are accepted:

     -b file  Store data part of the USB trace in binary format to the given file.  This option also works with the -r and -f options.

     -i ifname
	      Listen on USB bus interface ifname.

     -r file  Read the raw packets from file.  This option also works with the -f option.

     -s snaplen
	      Snapshot snaplen bytes from each packet.

     -v       Enable debugging messages.  When defined multiple times the verbosity level increases.

     -w file  Write the raw packets to file.  This option also works with the -s and -v options.

     -f filter
	      The filter argument consists of either one or two numbers separated by a dot.  The first indicates the device unit number which
	      should be traced.  The second number which is optional indicates the endpoint which should be traced.  To get all traffic for the
	      control endpoint, two filters should be created, one for endpoint 0 and one for endpoint 128.  If 128 is added to the endpoint num-
	      ber that means IN direction, else OUT direction is implied.  A device unit or endpoint value of -1 means ignore this field.  If no
	      filters are specified, all packets are passed through using the default -1,-1 filter.  This option can be specified multiple times.

     -h       This option displays a summary of the command line options.

EXAMPLES
     Capture the USB raw packets on usbus2:

	   usbdump -i usbus2 -s 256 -v

     Dump the USB raw packets of usbus2 into the file without packet size limit:

	   usbdump -i usbus2 -s 0 -w /tmp/dump_pkts

     Dump the USB raw packets of usbus2, but only the control endpoint traffic of device unit number 3:

	   usbdump -i usbus2 -s 0 -f 3.0 -f 3.128 -w /tmp/dump_pkts

     Read and display the USB raw packets from previous file:

	   usbdump -r /tmp/dump_pkts -v

OUTPUT FORMAT
     The output format of usbdump is as follows:

	   <time> <bus>.<addr> <ep> <xfertype> <S/D> (<frames>/<length>) <...>

     The meaning of the output format elements is as follows:

     <time>	 A timestamp preceding all output lines.  The timestamp has the format "hh:mm:ss.frac" and is as accurate as the kernel's clock.

     <bus>	 The USB host controller's bus unit number.

     <addr>	 The unique number of the USB device as allocated by the host controller driver.

     <ep>	 The USB endpoint address that indicates whether the address is OUT or IN.

     <xfertype>  The USB transfer type.  Can be CTRL, ISOC, BULK or INTR.

     <S/D>	 `S' indicates a USB submit.  `D' indicates a USB transfer done.

     <frames>	 Numbers of frames in this packets.  If this is a USB submit, its value is xfer->nframes which means how many frames are accept-
		 able or registered to transfer.  If this is a USB done, xfer->aframes is the actual number of frames.

     <length>	 Total packet size.  If this is a USB submit, its value is xfer->sumlen.  If this is a USB done, its value is xfer->actlen.

     <...>	 Optional field used for printing an error string if the packet is from USB done.

SEE ALSO
     usbconfig(8)

AUTHORS
     Weongyo Jeong <weongyo@FreeBSD.org>

BSD
								  April 24, 2012							       BSD